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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jeff Garzikaf36d7f2005-08-28 20:18:39 -04002 * libata-core.c - helper library for ATA
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
32 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 */
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/pci.h>
38#include <linux/init.h>
39#include <linux/list.h>
40#include <linux/mm.h>
41#include <linux/highmem.h>
42#include <linux/spinlock.h>
43#include <linux/blkdev.h>
44#include <linux/delay.h>
45#include <linux/timer.h>
46#include <linux/interrupt.h>
47#include <linux/completion.h>
48#include <linux/suspend.h>
49#include <linux/workqueue.h>
Jeff Garzik67846b32005-10-05 02:58:32 -040050#include <linux/jiffies.h>
David Hardeman378f0582005-09-17 17:55:31 +100051#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <scsi/scsi.h>
Jeff Garzik193515d2005-11-07 00:59:37 -050053#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <scsi/scsi_host.h>
55#include <linux/libata.h>
56#include <asm/io.h>
57#include <asm/semaphore.h>
58#include <asm/byteorder.h>
59
60#include "libata.h"
61
Tejun Heod7bb4cc2006-05-31 18:27:46 +090062/* debounce timing parameters in msecs { interval, duration, timeout } */
Tejun Heoe9c83912006-07-03 16:07:26 +090063const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
64const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
65const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
Tejun Heod7bb4cc2006-05-31 18:27:46 +090066
Tejun Heo3373efd2006-05-15 20:57:53 +090067static unsigned int ata_dev_init_params(struct ata_device *dev,
68 u16 heads, u16 sectors);
69static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
70static void ata_dev_xfermask(struct ata_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72static unsigned int ata_unique_id = 1;
73static struct workqueue_struct *ata_wq;
74
Tejun Heo453b07a2006-05-31 18:27:42 +090075struct workqueue_struct *ata_aux_wq;
76
Jeff Garzik418dc1f2006-03-11 20:50:08 -050077int atapi_enabled = 1;
Jeff Garzik1623c812005-08-30 03:37:42 -040078module_param(atapi_enabled, int, 0444);
79MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
80
Albert Lee95de7192006-04-04 10:57:18 +080081int atapi_dmadir = 0;
82module_param(atapi_dmadir, int, 0444);
83MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
84
Jeff Garzikc3c013a2006-02-27 22:31:19 -050085int libata_fua = 0;
86module_param_named(fua, libata_fua, int, 0444);
87MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
88
Andrew Mortona8601e52006-06-25 01:36:52 -070089static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
90module_param(ata_probe_timeout, int, 0444);
91MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093MODULE_AUTHOR("Jeff Garzik");
94MODULE_DESCRIPTION("Library module for ATA devices");
95MODULE_LICENSE("GPL");
96MODULE_VERSION(DRV_VERSION);
97
Edward Falk0baab862005-06-02 18:17:13 -040098
99/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
101 * @tf: Taskfile to convert
102 * @fis: Buffer into which data will output
103 * @pmp: Port multiplier port
104 *
105 * Converts a standard ATA taskfile to a Serial ATA
106 * FIS structure (Register - Host to Device).
107 *
108 * LOCKING:
109 * Inherited from caller.
110 */
111
Jeff Garzik057ace52005-10-22 14:27:05 -0400112void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 fis[0] = 0x27; /* Register - Host to Device FIS */
115 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
116 bit 7 indicates Command FIS */
117 fis[2] = tf->command;
118 fis[3] = tf->feature;
119
120 fis[4] = tf->lbal;
121 fis[5] = tf->lbam;
122 fis[6] = tf->lbah;
123 fis[7] = tf->device;
124
125 fis[8] = tf->hob_lbal;
126 fis[9] = tf->hob_lbam;
127 fis[10] = tf->hob_lbah;
128 fis[11] = tf->hob_feature;
129
130 fis[12] = tf->nsect;
131 fis[13] = tf->hob_nsect;
132 fis[14] = 0;
133 fis[15] = tf->ctl;
134
135 fis[16] = 0;
136 fis[17] = 0;
137 fis[18] = 0;
138 fis[19] = 0;
139}
140
141/**
142 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
143 * @fis: Buffer from which data will be input
144 * @tf: Taskfile to output
145 *
Mark Lorde12a1be2005-11-12 18:55:45 -0500146 * Converts a serial ATA FIS structure to a standard ATA taskfile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 *
148 * LOCKING:
149 * Inherited from caller.
150 */
151
Jeff Garzik057ace52005-10-22 14:27:05 -0400152void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 tf->command = fis[2]; /* status */
155 tf->feature = fis[3]; /* error */
156
157 tf->lbal = fis[4];
158 tf->lbam = fis[5];
159 tf->lbah = fis[6];
160 tf->device = fis[7];
161
162 tf->hob_lbal = fis[8];
163 tf->hob_lbam = fis[9];
164 tf->hob_lbah = fis[10];
165
166 tf->nsect = fis[12];
167 tf->hob_nsect = fis[13];
168}
169
Albert Lee8cbd6df2005-10-12 15:06:27 +0800170static const u8 ata_rw_cmds[] = {
171 /* pio multi */
172 ATA_CMD_READ_MULTI,
173 ATA_CMD_WRITE_MULTI,
174 ATA_CMD_READ_MULTI_EXT,
175 ATA_CMD_WRITE_MULTI_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100176 0,
177 0,
178 0,
179 ATA_CMD_WRITE_MULTI_FUA_EXT,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800180 /* pio */
181 ATA_CMD_PIO_READ,
182 ATA_CMD_PIO_WRITE,
183 ATA_CMD_PIO_READ_EXT,
184 ATA_CMD_PIO_WRITE_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100185 0,
186 0,
187 0,
188 0,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800189 /* dma */
190 ATA_CMD_READ,
191 ATA_CMD_WRITE,
192 ATA_CMD_READ_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100193 ATA_CMD_WRITE_EXT,
194 0,
195 0,
196 0,
197 ATA_CMD_WRITE_FUA_EXT
Albert Lee8cbd6df2005-10-12 15:06:27 +0800198};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200/**
Albert Lee8cbd6df2005-10-12 15:06:27 +0800201 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
Tejun Heobd056d72006-11-14 22:47:10 +0900202 * @tf: command to examine and configure
203 * @dev: device tf belongs to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500205 * Examine the device configuration and tf->flags to calculate
Albert Lee8cbd6df2005-10-12 15:06:27 +0800206 * the proper read/write commands and protocol to use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 *
208 * LOCKING:
209 * caller.
210 */
Tejun Heobd056d72006-11-14 22:47:10 +0900211static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100213 u8 cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100215 int index, fua, lba48, write;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500216
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100217 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800218 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
219 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Albert Lee8cbd6df2005-10-12 15:06:27 +0800221 if (dev->flags & ATA_DFLAG_PIO) {
222 tf->protocol = ATA_PROT_PIO;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100223 index = dev->multi_count ? 0 : 8;
Tejun Heobd056d72006-11-14 22:47:10 +0900224 } else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
Alan Cox8d238e02006-01-17 20:50:31 +0000225 /* Unable to use DMA due to host limitation */
226 tf->protocol = ATA_PROT_PIO;
Albert Lee0565c262006-02-13 18:55:25 +0800227 index = dev->multi_count ? 0 : 8;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800228 } else {
229 tf->protocol = ATA_PROT_DMA;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100230 index = 16;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100233 cmd = ata_rw_cmds[index + fua + lba48 + write];
234 if (cmd) {
235 tf->command = cmd;
236 return 0;
237 }
238 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
Tejun Heocb95d562006-03-06 04:31:56 +0900241/**
Tejun Heo35b649f2006-11-14 22:37:35 +0900242 * ata_tf_read_block - Read block address from ATA taskfile
243 * @tf: ATA taskfile of interest
244 * @dev: ATA device @tf belongs to
245 *
246 * LOCKING:
247 * None.
248 *
249 * Read block address from @tf. This function can handle all
250 * three address formats - LBA, LBA48 and CHS. tf->protocol and
251 * flags select the address format to use.
252 *
253 * RETURNS:
254 * Block address read from @tf.
255 */
256u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
257{
258 u64 block = 0;
259
260 if (tf->flags & ATA_TFLAG_LBA) {
261 if (tf->flags & ATA_TFLAG_LBA48) {
262 block |= (u64)tf->hob_lbah << 40;
263 block |= (u64)tf->hob_lbam << 32;
264 block |= tf->hob_lbal << 24;
265 } else
266 block |= (tf->device & 0xf) << 24;
267
268 block |= tf->lbah << 16;
269 block |= tf->lbam << 8;
270 block |= tf->lbal;
271 } else {
272 u32 cyl, head, sect;
273
274 cyl = tf->lbam | (tf->lbah << 8);
275 head = tf->device & 0xf;
276 sect = tf->lbal;
277
278 block = (cyl * dev->heads + head) * dev->sectors + sect;
279 }
280
281 return block;
282}
283
284/**
Tejun Heobd056d72006-11-14 22:47:10 +0900285 * ata_build_rw_tf - Build ATA taskfile for given read/write request
286 * @tf: Target ATA taskfile
287 * @dev: ATA device @tf belongs to
288 * @block: Block address
289 * @n_block: Number of blocks
290 * @tf_flags: RW/FUA etc...
291 * @tag: tag
292 *
293 * LOCKING:
294 * None.
295 *
296 * Build ATA taskfile @tf for read/write request described by
297 * @block, @n_block, @tf_flags and @tag on @dev.
298 *
299 * RETURNS:
300 *
301 * 0 on success, -ERANGE if the request is too large for @dev,
302 * -EINVAL if the request is invalid.
303 */
304int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
305 u64 block, u32 n_block, unsigned int tf_flags,
306 unsigned int tag)
307{
308 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
309 tf->flags |= tf_flags;
310
311 if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
Tejun Heo70e6ad02006-11-14 22:47:10 +0900312 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ &&
313 likely(tag != ATA_TAG_INTERNAL)) {
Tejun Heobd056d72006-11-14 22:47:10 +0900314 /* yay, NCQ */
315 if (!lba_48_ok(block, n_block))
316 return -ERANGE;
317
318 tf->protocol = ATA_PROT_NCQ;
319 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
320
321 if (tf->flags & ATA_TFLAG_WRITE)
322 tf->command = ATA_CMD_FPDMA_WRITE;
323 else
324 tf->command = ATA_CMD_FPDMA_READ;
325
326 tf->nsect = tag << 3;
327 tf->hob_feature = (n_block >> 8) & 0xff;
328 tf->feature = n_block & 0xff;
329
330 tf->hob_lbah = (block >> 40) & 0xff;
331 tf->hob_lbam = (block >> 32) & 0xff;
332 tf->hob_lbal = (block >> 24) & 0xff;
333 tf->lbah = (block >> 16) & 0xff;
334 tf->lbam = (block >> 8) & 0xff;
335 tf->lbal = block & 0xff;
336
337 tf->device = 1 << 6;
338 if (tf->flags & ATA_TFLAG_FUA)
339 tf->device |= 1 << 7;
340 } else if (dev->flags & ATA_DFLAG_LBA) {
341 tf->flags |= ATA_TFLAG_LBA;
342
343 if (lba_28_ok(block, n_block)) {
344 /* use LBA28 */
345 tf->device |= (block >> 24) & 0xf;
346 } else if (lba_48_ok(block, n_block)) {
347 if (!(dev->flags & ATA_DFLAG_LBA48))
348 return -ERANGE;
349
350 /* use LBA48 */
351 tf->flags |= ATA_TFLAG_LBA48;
352
353 tf->hob_nsect = (n_block >> 8) & 0xff;
354
355 tf->hob_lbah = (block >> 40) & 0xff;
356 tf->hob_lbam = (block >> 32) & 0xff;
357 tf->hob_lbal = (block >> 24) & 0xff;
358 } else
359 /* request too large even for LBA48 */
360 return -ERANGE;
361
362 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
363 return -EINVAL;
364
365 tf->nsect = n_block & 0xff;
366
367 tf->lbah = (block >> 16) & 0xff;
368 tf->lbam = (block >> 8) & 0xff;
369 tf->lbal = block & 0xff;
370
371 tf->device |= ATA_LBA;
372 } else {
373 /* CHS */
374 u32 sect, head, cyl, track;
375
376 /* The request -may- be too large for CHS addressing. */
377 if (!lba_28_ok(block, n_block))
378 return -ERANGE;
379
380 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
381 return -EINVAL;
382
383 /* Convert LBA to CHS */
384 track = (u32)block / dev->sectors;
385 cyl = track / dev->heads;
386 head = track % dev->heads;
387 sect = (u32)block % dev->sectors + 1;
388
389 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
390 (u32)block, track, cyl, head, sect);
391
392 /* Check whether the converted CHS can fit.
393 Cylinder: 0-65535
394 Head: 0-15
395 Sector: 1-255*/
396 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
397 return -ERANGE;
398
399 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
400 tf->lbal = sect;
401 tf->lbam = cyl;
402 tf->lbah = cyl >> 8;
403 tf->device |= head;
404 }
405
406 return 0;
407}
408
409/**
Tejun Heocb95d562006-03-06 04:31:56 +0900410 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
411 * @pio_mask: pio_mask
412 * @mwdma_mask: mwdma_mask
413 * @udma_mask: udma_mask
414 *
415 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
416 * unsigned int xfer_mask.
417 *
418 * LOCKING:
419 * None.
420 *
421 * RETURNS:
422 * Packed xfer_mask.
423 */
424static unsigned int ata_pack_xfermask(unsigned int pio_mask,
425 unsigned int mwdma_mask,
426 unsigned int udma_mask)
427{
428 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
429 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
430 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
431}
432
Tejun Heoc0489e42006-03-24 14:07:49 +0900433/**
434 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
435 * @xfer_mask: xfer_mask to unpack
436 * @pio_mask: resulting pio_mask
437 * @mwdma_mask: resulting mwdma_mask
438 * @udma_mask: resulting udma_mask
439 *
440 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
441 * Any NULL distination masks will be ignored.
442 */
443static void ata_unpack_xfermask(unsigned int xfer_mask,
444 unsigned int *pio_mask,
445 unsigned int *mwdma_mask,
446 unsigned int *udma_mask)
447{
448 if (pio_mask)
449 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
450 if (mwdma_mask)
451 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
452 if (udma_mask)
453 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
454}
455
Tejun Heocb95d562006-03-06 04:31:56 +0900456static const struct ata_xfer_ent {
Tejun Heobe9a50c2006-03-31 22:48:52 +0900457 int shift, bits;
Tejun Heocb95d562006-03-06 04:31:56 +0900458 u8 base;
459} ata_xfer_tbl[] = {
460 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
461 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
462 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
463 { -1, },
464};
465
466/**
467 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
468 * @xfer_mask: xfer_mask of interest
469 *
470 * Return matching XFER_* value for @xfer_mask. Only the highest
471 * bit of @xfer_mask is considered.
472 *
473 * LOCKING:
474 * None.
475 *
476 * RETURNS:
477 * Matching XFER_* value, 0 if no match found.
478 */
479static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
480{
481 int highbit = fls(xfer_mask) - 1;
482 const struct ata_xfer_ent *ent;
483
484 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
485 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
486 return ent->base + highbit - ent->shift;
487 return 0;
488}
489
490/**
491 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
492 * @xfer_mode: XFER_* of interest
493 *
494 * Return matching xfer_mask for @xfer_mode.
495 *
496 * LOCKING:
497 * None.
498 *
499 * RETURNS:
500 * Matching xfer_mask, 0 if no match found.
501 */
502static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
503{
504 const struct ata_xfer_ent *ent;
505
506 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
507 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
508 return 1 << (ent->shift + xfer_mode - ent->base);
509 return 0;
510}
511
512/**
513 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
514 * @xfer_mode: XFER_* of interest
515 *
516 * Return matching xfer_shift for @xfer_mode.
517 *
518 * LOCKING:
519 * None.
520 *
521 * RETURNS:
522 * Matching xfer_shift, -1 if no match found.
523 */
524static int ata_xfer_mode2shift(unsigned int xfer_mode)
525{
526 const struct ata_xfer_ent *ent;
527
528 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
529 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
530 return ent->shift;
531 return -1;
532}
533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534/**
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900535 * ata_mode_string - convert xfer_mask to string
536 * @xfer_mask: mask of bits supported; only highest bit counts.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 *
538 * Determine string which represents the highest speed
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900539 * (highest bit in @modemask).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 *
541 * LOCKING:
542 * None.
543 *
544 * RETURNS:
545 * Constant C string representing highest speed listed in
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900546 * @mode_mask, or the constant C string "<n/a>".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 */
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900548static const char *ata_mode_string(unsigned int xfer_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
Tejun Heo75f554b2006-03-06 04:31:57 +0900550 static const char * const xfer_mode_str[] = {
551 "PIO0",
552 "PIO1",
553 "PIO2",
554 "PIO3",
555 "PIO4",
Alan Coxb352e572006-08-10 18:52:12 +0100556 "PIO5",
557 "PIO6",
Tejun Heo75f554b2006-03-06 04:31:57 +0900558 "MWDMA0",
559 "MWDMA1",
560 "MWDMA2",
Alan Coxb352e572006-08-10 18:52:12 +0100561 "MWDMA3",
562 "MWDMA4",
Tejun Heo75f554b2006-03-06 04:31:57 +0900563 "UDMA/16",
564 "UDMA/25",
565 "UDMA/33",
566 "UDMA/44",
567 "UDMA/66",
568 "UDMA/100",
569 "UDMA/133",
570 "UDMA7",
571 };
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900572 int highbit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900574 highbit = fls(xfer_mask) - 1;
575 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
576 return xfer_mode_str[highbit];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 return "<n/a>";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
Tejun Heo4c360c82006-04-01 01:38:17 +0900580static const char *sata_spd_string(unsigned int spd)
581{
582 static const char * const spd_str[] = {
583 "1.5 Gbps",
584 "3.0 Gbps",
585 };
586
587 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
588 return "<unknown>";
589 return spd_str[spd - 1];
590}
591
Tejun Heo3373efd2006-05-15 20:57:53 +0900592void ata_dev_disable(struct ata_device *dev)
Tejun Heo0b8efb02006-03-24 15:25:31 +0900593{
Borislav Petkov0dd4b212006-06-23 02:29:08 -0400594 if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
Tejun Heof15a1da2006-05-15 20:57:56 +0900595 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
Tejun Heo0b8efb02006-03-24 15:25:31 +0900596 dev->class++;
597 }
598}
599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600/**
601 * ata_pio_devchk - PATA device presence detection
602 * @ap: ATA channel to examine
603 * @device: Device to examine (starting at zero)
604 *
605 * This technique was originally described in
606 * Hale Landis's ATADRVR (www.ata-atapi.com), and
607 * later found its way into the ATA/ATAPI spec.
608 *
609 * Write a pattern to the ATA shadow registers,
610 * and if a device is present, it will respond by
611 * correctly storing and echoing back the
612 * ATA shadow register contents.
613 *
614 * LOCKING:
615 * caller.
616 */
617
618static unsigned int ata_pio_devchk(struct ata_port *ap,
619 unsigned int device)
620{
621 struct ata_ioports *ioaddr = &ap->ioaddr;
622 u8 nsect, lbal;
623
624 ap->ops->dev_select(ap, device);
625
626 outb(0x55, ioaddr->nsect_addr);
627 outb(0xaa, ioaddr->lbal_addr);
628
629 outb(0xaa, ioaddr->nsect_addr);
630 outb(0x55, ioaddr->lbal_addr);
631
632 outb(0x55, ioaddr->nsect_addr);
633 outb(0xaa, ioaddr->lbal_addr);
634
635 nsect = inb(ioaddr->nsect_addr);
636 lbal = inb(ioaddr->lbal_addr);
637
638 if ((nsect == 0x55) && (lbal == 0xaa))
639 return 1; /* we found a device */
640
641 return 0; /* nothing found */
642}
643
644/**
645 * ata_mmio_devchk - PATA device presence detection
646 * @ap: ATA channel to examine
647 * @device: Device to examine (starting at zero)
648 *
649 * This technique was originally described in
650 * Hale Landis's ATADRVR (www.ata-atapi.com), and
651 * later found its way into the ATA/ATAPI spec.
652 *
653 * Write a pattern to the ATA shadow registers,
654 * and if a device is present, it will respond by
655 * correctly storing and echoing back the
656 * ATA shadow register contents.
657 *
658 * LOCKING:
659 * caller.
660 */
661
662static unsigned int ata_mmio_devchk(struct ata_port *ap,
663 unsigned int device)
664{
665 struct ata_ioports *ioaddr = &ap->ioaddr;
666 u8 nsect, lbal;
667
668 ap->ops->dev_select(ap, device);
669
670 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
671 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
672
673 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
674 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
675
676 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
677 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
678
679 nsect = readb((void __iomem *) ioaddr->nsect_addr);
680 lbal = readb((void __iomem *) ioaddr->lbal_addr);
681
682 if ((nsect == 0x55) && (lbal == 0xaa))
683 return 1; /* we found a device */
684
685 return 0; /* nothing found */
686}
687
688/**
689 * ata_devchk - PATA device presence detection
690 * @ap: ATA channel to examine
691 * @device: Device to examine (starting at zero)
692 *
693 * Dispatch ATA device presence detection, depending
694 * on whether we are using PIO or MMIO to talk to the
695 * ATA shadow registers.
696 *
697 * LOCKING:
698 * caller.
699 */
700
701static unsigned int ata_devchk(struct ata_port *ap,
702 unsigned int device)
703{
704 if (ap->flags & ATA_FLAG_MMIO)
705 return ata_mmio_devchk(ap, device);
706 return ata_pio_devchk(ap, device);
707}
708
709/**
710 * ata_dev_classify - determine device type based on ATA-spec signature
711 * @tf: ATA taskfile register set for device to be identified
712 *
713 * Determine from taskfile register contents whether a device is
714 * ATA or ATAPI, as per "Signature and persistence" section
715 * of ATA/PI spec (volume 1, sect 5.14).
716 *
717 * LOCKING:
718 * None.
719 *
720 * RETURNS:
721 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
722 * the event of failure.
723 */
724
Jeff Garzik057ace52005-10-22 14:27:05 -0400725unsigned int ata_dev_classify(const struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
727 /* Apple's open source Darwin code hints that some devices only
728 * put a proper signature into the LBA mid/high registers,
729 * So, we only check those. It's sufficient for uniqueness.
730 */
731
732 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
733 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
734 DPRINTK("found ATA device by sig\n");
735 return ATA_DEV_ATA;
736 }
737
738 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
739 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
740 DPRINTK("found ATAPI device by sig\n");
741 return ATA_DEV_ATAPI;
742 }
743
744 DPRINTK("unknown device\n");
745 return ATA_DEV_UNKNOWN;
746}
747
748/**
749 * ata_dev_try_classify - Parse returned ATA device signature
750 * @ap: ATA channel to examine
751 * @device: Device to examine (starting at zero)
Tejun Heob4dc7622006-01-24 17:05:22 +0900752 * @r_err: Value of error register on completion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 *
754 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
755 * an ATA/ATAPI-defined set of values is placed in the ATA
756 * shadow registers, indicating the results of device detection
757 * and diagnostics.
758 *
759 * Select the ATA device, and read the values from the ATA shadow
760 * registers. Then parse according to the Error register value,
761 * and the spec-defined values examined by ata_dev_classify().
762 *
763 * LOCKING:
764 * caller.
Tejun Heob4dc7622006-01-24 17:05:22 +0900765 *
766 * RETURNS:
767 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 */
769
Tejun Heob4dc7622006-01-24 17:05:22 +0900770static unsigned int
771ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 struct ata_taskfile tf;
774 unsigned int class;
775 u8 err;
776
777 ap->ops->dev_select(ap, device);
778
779 memset(&tf, 0, sizeof(tf));
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 ap->ops->tf_read(ap, &tf);
Jeff Garzik0169e282005-10-29 21:25:10 -0400782 err = tf.feature;
Tejun Heob4dc7622006-01-24 17:05:22 +0900783 if (r_err)
784 *r_err = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
Alan Cox93590852006-09-12 16:55:12 +0100786 /* see if device passed diags: if master then continue and warn later */
787 if (err == 0 && device == 0)
788 /* diagnostic fail : do nothing _YET_ */
789 ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
790 else if (err == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 /* do nothing */ ;
792 else if ((device == 0) && (err == 0x81))
793 /* do nothing */ ;
794 else
Tejun Heob4dc7622006-01-24 17:05:22 +0900795 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Tejun Heob4dc7622006-01-24 17:05:22 +0900797 /* determine if device is ATA or ATAPI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 class = ata_dev_classify(&tf);
Tejun Heob4dc7622006-01-24 17:05:22 +0900799
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 if (class == ATA_DEV_UNKNOWN)
Tejun Heob4dc7622006-01-24 17:05:22 +0900801 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
Tejun Heob4dc7622006-01-24 17:05:22 +0900803 return ATA_DEV_NONE;
804 return class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
807/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900808 * ata_id_string - Convert IDENTIFY DEVICE page into string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 * @id: IDENTIFY DEVICE results we will examine
810 * @s: string into which data is output
811 * @ofs: offset into identify device page
812 * @len: length of string to return. must be an even number.
813 *
814 * The strings in the IDENTIFY DEVICE page are broken up into
815 * 16-bit chunks. Run through the string, and output each
816 * 8-bit chunk linearly, regardless of platform.
817 *
818 * LOCKING:
819 * caller.
820 */
821
Tejun Heo6a62a042006-02-13 10:02:46 +0900822void ata_id_string(const u16 *id, unsigned char *s,
823 unsigned int ofs, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
825 unsigned int c;
826
827 while (len > 0) {
828 c = id[ofs] >> 8;
829 *s = c;
830 s++;
831
832 c = id[ofs] & 0xff;
833 *s = c;
834 s++;
835
836 ofs++;
837 len -= 2;
838 }
839}
840
Tejun Heo0e949ff2006-02-12 22:47:04 +0900841/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900842 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
Tejun Heo0e949ff2006-02-12 22:47:04 +0900843 * @id: IDENTIFY DEVICE results we will examine
844 * @s: string into which data is output
845 * @ofs: offset into identify device page
846 * @len: length of string to return. must be an odd number.
847 *
Tejun Heo6a62a042006-02-13 10:02:46 +0900848 * This function is identical to ata_id_string except that it
Tejun Heo0e949ff2006-02-12 22:47:04 +0900849 * trims trailing spaces and terminates the resulting string with
850 * null. @len must be actual maximum length (even number) + 1.
851 *
852 * LOCKING:
853 * caller.
854 */
Tejun Heo6a62a042006-02-13 10:02:46 +0900855void ata_id_c_string(const u16 *id, unsigned char *s,
856 unsigned int ofs, unsigned int len)
Tejun Heo0e949ff2006-02-12 22:47:04 +0900857{
858 unsigned char *p;
859
860 WARN_ON(!(len & 1));
861
Tejun Heo6a62a042006-02-13 10:02:46 +0900862 ata_id_string(id, s, ofs, len - 1);
Tejun Heo0e949ff2006-02-12 22:47:04 +0900863
864 p = s + strnlen(s, len - 1);
865 while (p > s && p[-1] == ' ')
866 p--;
867 *p = '\0';
868}
Edward Falk0baab862005-06-02 18:17:13 -0400869
Tejun Heo29407402006-02-12 22:47:04 +0900870static u64 ata_id_n_sectors(const u16 *id)
871{
872 if (ata_id_has_lba(id)) {
873 if (ata_id_has_lba48(id))
874 return ata_id_u64(id, 100);
875 else
876 return ata_id_u32(id, 60);
877 } else {
878 if (ata_id_current_chs_valid(id))
879 return ata_id_u32(id, 57);
880 else
881 return id[1] * id[3] * id[6];
882 }
883}
884
Edward Falk0baab862005-06-02 18:17:13 -0400885/**
886 * ata_noop_dev_select - Select device 0/1 on ATA bus
887 * @ap: ATA channel to manipulate
888 * @device: ATA device (numbered from zero) to select
889 *
890 * This function performs no actual function.
891 *
892 * May be used as the dev_select() entry in ata_port_operations.
893 *
894 * LOCKING:
895 * caller.
896 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
898{
899}
900
Edward Falk0baab862005-06-02 18:17:13 -0400901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902/**
903 * ata_std_dev_select - Select device 0/1 on ATA bus
904 * @ap: ATA channel to manipulate
905 * @device: ATA device (numbered from zero) to select
906 *
907 * Use the method defined in the ATA specification to
908 * make either device 0, or device 1, active on the
Edward Falk0baab862005-06-02 18:17:13 -0400909 * ATA channel. Works with both PIO and MMIO.
910 *
911 * May be used as the dev_select() entry in ata_port_operations.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 *
913 * LOCKING:
914 * caller.
915 */
916
917void ata_std_dev_select (struct ata_port *ap, unsigned int device)
918{
919 u8 tmp;
920
921 if (device == 0)
922 tmp = ATA_DEVICE_OBS;
923 else
924 tmp = ATA_DEVICE_OBS | ATA_DEV1;
925
926 if (ap->flags & ATA_FLAG_MMIO) {
927 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
928 } else {
929 outb(tmp, ap->ioaddr.device_addr);
930 }
931 ata_pause(ap); /* needed; also flushes, for mmio */
932}
933
934/**
935 * ata_dev_select - Select device 0/1 on ATA bus
936 * @ap: ATA channel to manipulate
937 * @device: ATA device (numbered from zero) to select
938 * @wait: non-zero to wait for Status register BSY bit to clear
939 * @can_sleep: non-zero if context allows sleeping
940 *
941 * Use the method defined in the ATA specification to
942 * make either device 0, or device 1, active on the
943 * ATA channel.
944 *
945 * This is a high-level version of ata_std_dev_select(),
946 * which additionally provides the services of inserting
947 * the proper pauses and status polling, where needed.
948 *
949 * LOCKING:
950 * caller.
951 */
952
953void ata_dev_select(struct ata_port *ap, unsigned int device,
954 unsigned int wait, unsigned int can_sleep)
955{
Tejun Heo88574552006-06-25 20:00:35 +0900956 if (ata_msg_probe(ap))
Borislav Petkov0dd4b212006-06-23 02:29:08 -0400957 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
Tejun Heo88574552006-06-25 20:00:35 +0900958 "device %u, wait %u\n", ap->id, device, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960 if (wait)
961 ata_wait_idle(ap);
962
963 ap->ops->dev_select(ap, device);
964
965 if (wait) {
966 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
967 msleep(150);
968 ata_wait_idle(ap);
969 }
970}
971
972/**
973 * ata_dump_id - IDENTIFY DEVICE info debugging output
Tejun Heo0bd33002006-02-12 22:47:05 +0900974 * @id: IDENTIFY DEVICE page to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 *
Tejun Heo0bd33002006-02-12 22:47:05 +0900976 * Dump selected 16-bit words from the given IDENTIFY DEVICE
977 * page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 *
979 * LOCKING:
980 * caller.
981 */
982
Tejun Heo0bd33002006-02-12 22:47:05 +0900983static inline void ata_dump_id(const u16 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984{
985 DPRINTK("49==0x%04x "
986 "53==0x%04x "
987 "63==0x%04x "
988 "64==0x%04x "
989 "75==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900990 id[49],
991 id[53],
992 id[63],
993 id[64],
994 id[75]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 DPRINTK("80==0x%04x "
996 "81==0x%04x "
997 "82==0x%04x "
998 "83==0x%04x "
999 "84==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +09001000 id[80],
1001 id[81],
1002 id[82],
1003 id[83],
1004 id[84]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 DPRINTK("88==0x%04x "
1006 "93==0x%04x\n",
Tejun Heo0bd33002006-02-12 22:47:05 +09001007 id[88],
1008 id[93]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
Tejun Heocb95d562006-03-06 04:31:56 +09001011/**
1012 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1013 * @id: IDENTIFY data to compute xfer mask from
1014 *
1015 * Compute the xfermask for this device. This is not as trivial
1016 * as it seems if we must consider early devices correctly.
1017 *
1018 * FIXME: pre IDE drive timing (do we care ?).
1019 *
1020 * LOCKING:
1021 * None.
1022 *
1023 * RETURNS:
1024 * Computed xfermask
1025 */
1026static unsigned int ata_id_xfermask(const u16 *id)
1027{
1028 unsigned int pio_mask, mwdma_mask, udma_mask;
1029
1030 /* Usual case. Word 53 indicates word 64 is valid */
1031 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1032 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1033 pio_mask <<= 3;
1034 pio_mask |= 0x7;
1035 } else {
1036 /* If word 64 isn't valid then Word 51 high byte holds
1037 * the PIO timing number for the maximum. Turn it into
1038 * a mask.
1039 */
Alan Cox46767aeb2006-09-29 18:26:47 +01001040 u8 mode = id[ATA_ID_OLD_PIO_MODES] & 0xFF;
1041 if (mode < 5) /* Valid PIO range */
1042 pio_mask = (2 << mode) - 1;
1043 else
1044 pio_mask = 1;
Tejun Heocb95d562006-03-06 04:31:56 +09001045
1046 /* But wait.. there's more. Design your standards by
1047 * committee and you too can get a free iordy field to
1048 * process. However its the speeds not the modes that
1049 * are supported... Note drivers using the timing API
1050 * will get this right anyway
1051 */
1052 }
1053
1054 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
Tejun Heofb21f0d2006-03-12 12:34:35 +09001055
Alan Coxb352e572006-08-10 18:52:12 +01001056 if (ata_id_is_cfa(id)) {
1057 /*
1058 * Process compact flash extended modes
1059 */
1060 int pio = id[163] & 0x7;
1061 int dma = (id[163] >> 3) & 7;
1062
1063 if (pio)
1064 pio_mask |= (1 << 5);
1065 if (pio > 1)
1066 pio_mask |= (1 << 6);
1067 if (dma)
1068 mwdma_mask |= (1 << 3);
1069 if (dma > 1)
1070 mwdma_mask |= (1 << 4);
1071 }
1072
Tejun Heofb21f0d2006-03-12 12:34:35 +09001073 udma_mask = 0;
1074 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1075 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
Tejun Heocb95d562006-03-06 04:31:56 +09001076
1077 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1078}
1079
Tejun Heo86e45b62006-03-05 15:29:09 +09001080/**
1081 * ata_port_queue_task - Queue port_task
1082 * @ap: The ata_port to queue port_task for
Randy Dunlape2a7f772006-05-18 10:50:18 -07001083 * @fn: workqueue function to be scheduled
David Howells65f27f32006-11-22 14:55:48 +00001084 * @data: data for @fn to use
Randy Dunlape2a7f772006-05-18 10:50:18 -07001085 * @delay: delay time for workqueue function
Tejun Heo86e45b62006-03-05 15:29:09 +09001086 *
1087 * Schedule @fn(@data) for execution after @delay jiffies using
1088 * port_task. There is one port_task per port and it's the
1089 * user(low level driver)'s responsibility to make sure that only
1090 * one task is active at any given time.
1091 *
1092 * libata core layer takes care of synchronization between
1093 * port_task and EH. ata_port_queue_task() may be ignored for EH
1094 * synchronization.
1095 *
1096 * LOCKING:
1097 * Inherited from caller.
1098 */
David Howells65f27f32006-11-22 14:55:48 +00001099void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
Tejun Heo86e45b62006-03-05 15:29:09 +09001100 unsigned long delay)
1101{
1102 int rc;
1103
Tejun Heob51e9e52006-06-29 01:29:30 +09001104 if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
Tejun Heo86e45b62006-03-05 15:29:09 +09001105 return;
1106
David Howells65f27f32006-11-22 14:55:48 +00001107 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1108 ap->port_task_data = data;
Tejun Heo86e45b62006-03-05 15:29:09 +09001109
David Howells52bad642006-11-22 14:54:01 +00001110 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
Tejun Heo86e45b62006-03-05 15:29:09 +09001111
1112 /* rc == 0 means that another user is using port task */
1113 WARN_ON(rc == 0);
1114}
1115
1116/**
1117 * ata_port_flush_task - Flush port_task
1118 * @ap: The ata_port to flush port_task for
1119 *
1120 * After this function completes, port_task is guranteed not to
1121 * be running or scheduled.
1122 *
1123 * LOCKING:
1124 * Kernel thread context (may sleep)
1125 */
1126void ata_port_flush_task(struct ata_port *ap)
1127{
1128 unsigned long flags;
1129
1130 DPRINTK("ENTER\n");
1131
Jeff Garzikba6a1302006-06-22 23:46:10 -04001132 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09001133 ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04001134 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo86e45b62006-03-05 15:29:09 +09001135
1136 DPRINTK("flush #1\n");
1137 flush_workqueue(ata_wq);
1138
1139 /*
1140 * At this point, if a task is running, it's guaranteed to see
1141 * the FLUSH flag; thus, it will never queue pio tasks again.
1142 * Cancel and flush.
1143 */
1144 if (!cancel_delayed_work(&ap->port_task)) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001145 if (ata_msg_ctl(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001146 ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
1147 __FUNCTION__);
Tejun Heo86e45b62006-03-05 15:29:09 +09001148 flush_workqueue(ata_wq);
1149 }
1150
Jeff Garzikba6a1302006-06-22 23:46:10 -04001151 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09001152 ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04001153 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo86e45b62006-03-05 15:29:09 +09001154
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001155 if (ata_msg_ctl(ap))
1156 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
Tejun Heo86e45b62006-03-05 15:29:09 +09001157}
1158
Tejun Heo77853bf2006-01-23 13:09:36 +09001159void ata_qc_complete_internal(struct ata_queued_cmd *qc)
Tejun Heoa2a7a662005-12-13 14:48:31 +09001160{
Tejun Heo77853bf2006-01-23 13:09:36 +09001161 struct completion *waiting = qc->private_data;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001162
Tejun Heoa2a7a662005-12-13 14:48:31 +09001163 complete(waiting);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001164}
1165
1166/**
Tejun Heo24326972006-11-14 22:47:09 +09001167 * ata_exec_internal_sg - execute libata internal command
Tejun Heoa2a7a662005-12-13 14:48:31 +09001168 * @dev: Device to which the command is sent
1169 * @tf: Taskfile registers for the command and the result
Tejun Heod69cf372006-04-02 18:51:53 +09001170 * @cdb: CDB for packet command
Tejun Heoa2a7a662005-12-13 14:48:31 +09001171 * @dma_dir: Data tranfer direction of the command
Tejun Heo24326972006-11-14 22:47:09 +09001172 * @sg: sg list for the data buffer of the command
1173 * @n_elem: Number of sg entries
Tejun Heoa2a7a662005-12-13 14:48:31 +09001174 *
1175 * Executes libata internal command with timeout. @tf contains
1176 * command on entry and result on return. Timeout and error
1177 * conditions are reported via return value. No recovery action
1178 * is taken after a command times out. It's caller's duty to
1179 * clean up after timeout.
1180 *
1181 * LOCKING:
1182 * None. Should be called with kernel context, might sleep.
Tejun Heo551e8882006-06-12 14:09:49 +09001183 *
1184 * RETURNS:
1185 * Zero on success, AC_ERR_* mask on failure
Tejun Heoa2a7a662005-12-13 14:48:31 +09001186 */
Tejun Heo24326972006-11-14 22:47:09 +09001187unsigned ata_exec_internal_sg(struct ata_device *dev,
1188 struct ata_taskfile *tf, const u8 *cdb,
1189 int dma_dir, struct scatterlist *sg,
1190 unsigned int n_elem)
Tejun Heoa2a7a662005-12-13 14:48:31 +09001191{
Tejun Heo3373efd2006-05-15 20:57:53 +09001192 struct ata_port *ap = dev->ap;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001193 u8 command = tf->command;
1194 struct ata_queued_cmd *qc;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001195 unsigned int tag, preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001196 u32 preempted_sactive, preempted_qc_active;
Ingo Molnar60be6b92006-07-03 00:25:26 -07001197 DECLARE_COMPLETION_ONSTACK(wait);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001198 unsigned long flags;
Tejun Heo77853bf2006-01-23 13:09:36 +09001199 unsigned int err_mask;
Tejun Heod95a7172006-05-15 20:58:14 +09001200 int rc;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001201
Jeff Garzikba6a1302006-06-22 23:46:10 -04001202 spin_lock_irqsave(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001203
Tejun Heoe3180492006-05-15 20:58:09 +09001204 /* no internal command while frozen */
Tejun Heob51e9e52006-06-29 01:29:30 +09001205 if (ap->pflags & ATA_PFLAG_FROZEN) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04001206 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001207 return AC_ERR_SYSTEM;
1208 }
1209
Tejun Heo2ab7db12006-05-15 20:58:02 +09001210 /* initialize internal qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001211
Tejun Heo2ab7db12006-05-15 20:58:02 +09001212 /* XXX: Tag 0 is used for drivers with legacy EH as some
1213 * drivers choke if any other tag is given. This breaks
1214 * ata_tag_internal() test for those drivers. Don't use new
1215 * EH stuff without converting to it.
1216 */
1217 if (ap->ops->error_handler)
1218 tag = ATA_TAG_INTERNAL;
1219 else
1220 tag = 0;
1221
Tejun Heo6cec4a32006-05-15 21:03:41 +09001222 if (test_and_set_bit(tag, &ap->qc_allocated))
Tejun Heo2ab7db12006-05-15 20:58:02 +09001223 BUG();
Tejun Heof69499f2006-05-15 20:58:03 +09001224 qc = __ata_qc_from_tag(ap, tag);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001225
1226 qc->tag = tag;
1227 qc->scsicmd = NULL;
1228 qc->ap = ap;
1229 qc->dev = dev;
1230 ata_qc_reinit(qc);
1231
1232 preempted_tag = ap->active_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001233 preempted_sactive = ap->sactive;
1234 preempted_qc_active = ap->qc_active;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001235 ap->active_tag = ATA_TAG_POISON;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001236 ap->sactive = 0;
1237 ap->qc_active = 0;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001238
1239 /* prepare & issue qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001240 qc->tf = *tf;
Tejun Heod69cf372006-04-02 18:51:53 +09001241 if (cdb)
1242 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
Tejun Heoe61e0672006-05-15 20:57:40 +09001243 qc->flags |= ATA_QCFLAG_RESULT_TF;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001244 qc->dma_dir = dma_dir;
1245 if (dma_dir != DMA_NONE) {
Tejun Heo24326972006-11-14 22:47:09 +09001246 unsigned int i, buflen = 0;
1247
1248 for (i = 0; i < n_elem; i++)
1249 buflen += sg[i].length;
1250
1251 ata_sg_init(qc, sg, n_elem);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001252 qc->nsect = buflen / ATA_SECT_SIZE;
1253 }
1254
Tejun Heo77853bf2006-01-23 13:09:36 +09001255 qc->private_data = &wait;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001256 qc->complete_fn = ata_qc_complete_internal;
1257
Tejun Heo8e0e6942006-03-31 20:41:11 +09001258 ata_qc_issue(qc);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001259
Jeff Garzikba6a1302006-06-22 23:46:10 -04001260 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001261
Andrew Mortona8601e52006-06-25 01:36:52 -07001262 rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
Albert Lee41ade502006-03-14 11:19:04 +08001263
Tejun Heod95a7172006-05-15 20:58:14 +09001264 ata_port_flush_task(ap);
1265
1266 if (!rc) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04001267 spin_lock_irqsave(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001268
1269 /* We're racing with irq here. If we lose, the
1270 * following test prevents us from completing the qc
Tejun Heod95a7172006-05-15 20:58:14 +09001271 * twice. If we win, the port is frozen and will be
1272 * cleaned up by ->post_internal_cmd().
Tejun Heoa2a7a662005-12-13 14:48:31 +09001273 */
Tejun Heo77853bf2006-01-23 13:09:36 +09001274 if (qc->flags & ATA_QCFLAG_ACTIVE) {
Tejun Heod95a7172006-05-15 20:58:14 +09001275 qc->err_mask |= AC_ERR_TIMEOUT;
1276
1277 if (ap->ops->error_handler)
1278 ata_port_freeze(ap);
1279 else
1280 ata_qc_complete(qc);
Tejun Heof15a1da2006-05-15 20:57:56 +09001281
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001282 if (ata_msg_warn(ap))
1283 ata_dev_printk(dev, KERN_WARNING,
Tejun Heo88574552006-06-25 20:00:35 +09001284 "qc timeout (cmd 0x%x)\n", command);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001285 }
1286
Jeff Garzikba6a1302006-06-22 23:46:10 -04001287 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001288 }
1289
Tejun Heod95a7172006-05-15 20:58:14 +09001290 /* do post_internal_cmd */
1291 if (ap->ops->post_internal_cmd)
1292 ap->ops->post_internal_cmd(qc);
1293
1294 if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001295 if (ata_msg_warn(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001296 ata_dev_printk(dev, KERN_WARNING,
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001297 "zero err_mask for failed "
Tejun Heo88574552006-06-25 20:00:35 +09001298 "internal command, assuming AC_ERR_OTHER\n");
Tejun Heod95a7172006-05-15 20:58:14 +09001299 qc->err_mask |= AC_ERR_OTHER;
1300 }
1301
Tejun Heo15869302006-05-15 20:57:33 +09001302 /* finish up */
Jeff Garzikba6a1302006-06-22 23:46:10 -04001303 spin_lock_irqsave(ap->lock, flags);
Tejun Heo15869302006-05-15 20:57:33 +09001304
Tejun Heoe61e0672006-05-15 20:57:40 +09001305 *tf = qc->result_tf;
Tejun Heo77853bf2006-01-23 13:09:36 +09001306 err_mask = qc->err_mask;
1307
1308 ata_qc_free(qc);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001309 ap->active_tag = preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001310 ap->sactive = preempted_sactive;
1311 ap->qc_active = preempted_qc_active;
Tejun Heo77853bf2006-01-23 13:09:36 +09001312
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001313 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1314 * Until those drivers are fixed, we detect the condition
1315 * here, fail the command with AC_ERR_SYSTEM and reenable the
1316 * port.
1317 *
1318 * Note that this doesn't change any behavior as internal
1319 * command failure results in disabling the device in the
1320 * higher layer for LLDDs without new reset/EH callbacks.
1321 *
1322 * Kill the following code as soon as those drivers are fixed.
1323 */
Tejun Heo198e0fe2006-04-02 18:51:52 +09001324 if (ap->flags & ATA_FLAG_DISABLED) {
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001325 err_mask |= AC_ERR_SYSTEM;
1326 ata_port_probe(ap);
1327 }
1328
Jeff Garzikba6a1302006-06-22 23:46:10 -04001329 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo15869302006-05-15 20:57:33 +09001330
Tejun Heo77853bf2006-01-23 13:09:36 +09001331 return err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001332}
1333
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334/**
Tejun Heo33480a02006-12-12 02:15:31 +09001335 * ata_exec_internal - execute libata internal command
Tejun Heo24326972006-11-14 22:47:09 +09001336 * @dev: Device to which the command is sent
1337 * @tf: Taskfile registers for the command and the result
1338 * @cdb: CDB for packet command
1339 * @dma_dir: Data tranfer direction of the command
1340 * @buf: Data buffer of the command
1341 * @buflen: Length of data buffer
1342 *
1343 * Wrapper around ata_exec_internal_sg() which takes simple
1344 * buffer instead of sg list.
1345 *
1346 * LOCKING:
1347 * None. Should be called with kernel context, might sleep.
1348 *
1349 * RETURNS:
1350 * Zero on success, AC_ERR_* mask on failure
1351 */
1352unsigned ata_exec_internal(struct ata_device *dev,
1353 struct ata_taskfile *tf, const u8 *cdb,
1354 int dma_dir, void *buf, unsigned int buflen)
1355{
Tejun Heo33480a02006-12-12 02:15:31 +09001356 struct scatterlist *psg = NULL, sg;
1357 unsigned int n_elem = 0;
Tejun Heo24326972006-11-14 22:47:09 +09001358
Tejun Heo33480a02006-12-12 02:15:31 +09001359 if (dma_dir != DMA_NONE) {
1360 WARN_ON(!buf);
1361 sg_init_one(&sg, buf, buflen);
1362 psg = &sg;
1363 n_elem++;
1364 }
Tejun Heo24326972006-11-14 22:47:09 +09001365
Tejun Heo33480a02006-12-12 02:15:31 +09001366 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
Tejun Heo24326972006-11-14 22:47:09 +09001367}
1368
1369/**
Tejun Heo977e6b92006-06-24 20:30:19 +09001370 * ata_do_simple_cmd - execute simple internal command
1371 * @dev: Device to which the command is sent
1372 * @cmd: Opcode to execute
1373 *
1374 * Execute a 'simple' command, that only consists of the opcode
1375 * 'cmd' itself, without filling any other registers
1376 *
1377 * LOCKING:
1378 * Kernel thread context (may sleep).
1379 *
1380 * RETURNS:
1381 * Zero on success, AC_ERR_* mask on failure
Tejun Heoe58eb582006-06-24 20:30:19 +09001382 */
Tejun Heo77b08fb2006-06-24 20:30:19 +09001383unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
Tejun Heoe58eb582006-06-24 20:30:19 +09001384{
1385 struct ata_taskfile tf;
Tejun Heoe58eb582006-06-24 20:30:19 +09001386
1387 ata_tf_init(dev, &tf);
1388
1389 tf.command = cmd;
1390 tf.flags |= ATA_TFLAG_DEVICE;
1391 tf.protocol = ATA_PROT_NODATA;
1392
Tejun Heo977e6b92006-06-24 20:30:19 +09001393 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Tejun Heoe58eb582006-06-24 20:30:19 +09001394}
1395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396/**
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001397 * ata_pio_need_iordy - check if iordy needed
1398 * @adev: ATA device
1399 *
1400 * Check if the current speed of the device requires IORDY. Used
1401 * by various controllers for chip configuration.
1402 */
1403
1404unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1405{
1406 int pio;
1407 int speed = adev->pio_mode - XFER_PIO_0;
1408
1409 if (speed < 2)
1410 return 0;
1411 if (speed > 2)
1412 return 1;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001413
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001414 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1415
1416 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1417 pio = adev->id[ATA_ID_EIDE_PIO];
1418 /* Is the speed faster than the drive allows non IORDY ? */
1419 if (pio) {
1420 /* This is cycle times not frequency - watch the logic! */
1421 if (pio > 240) /* PIO2 is 240nS per cycle */
1422 return 1;
1423 return 0;
1424 }
1425 }
1426 return 0;
1427}
1428
1429/**
Tejun Heo49016ac2006-02-21 02:12:11 +09001430 * ata_dev_read_id - Read ID data from the specified device
Tejun Heo49016ac2006-02-21 02:12:11 +09001431 * @dev: target device
1432 * @p_class: pointer to class of the target device (may be changed)
Tejun Heobff04642006-11-10 18:08:10 +09001433 * @flags: ATA_READID_* flags
Tejun Heofe635c72006-05-15 20:57:35 +09001434 * @id: buffer to read IDENTIFY data into
Tejun Heo49016ac2006-02-21 02:12:11 +09001435 *
1436 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1437 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
Tejun Heoaec5c3c2006-03-25 01:33:34 +09001438 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1439 * for pre-ATA4 drives.
Tejun Heo49016ac2006-02-21 02:12:11 +09001440 *
1441 * LOCKING:
1442 * Kernel thread context (may sleep)
1443 *
1444 * RETURNS:
1445 * 0 on success, -errno otherwise.
1446 */
Tejun Heoa9beec92006-05-31 18:27:44 +09001447int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
Tejun Heobff04642006-11-10 18:08:10 +09001448 unsigned int flags, u16 *id)
Tejun Heo49016ac2006-02-21 02:12:11 +09001449{
Tejun Heo3373efd2006-05-15 20:57:53 +09001450 struct ata_port *ap = dev->ap;
Tejun Heo49016ac2006-02-21 02:12:11 +09001451 unsigned int class = *p_class;
Tejun Heo49016ac2006-02-21 02:12:11 +09001452 struct ata_taskfile tf;
1453 unsigned int err_mask = 0;
1454 const char *reason;
1455 int rc;
1456
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001457 if (ata_msg_ctl(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001458 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
1459 __FUNCTION__, ap->id, dev->devno);
Tejun Heo49016ac2006-02-21 02:12:11 +09001460
Tejun Heo49016ac2006-02-21 02:12:11 +09001461 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1462
1463 retry:
Tejun Heo3373efd2006-05-15 20:57:53 +09001464 ata_tf_init(dev, &tf);
Tejun Heo49016ac2006-02-21 02:12:11 +09001465
1466 switch (class) {
1467 case ATA_DEV_ATA:
1468 tf.command = ATA_CMD_ID_ATA;
1469 break;
1470 case ATA_DEV_ATAPI:
1471 tf.command = ATA_CMD_ID_ATAPI;
1472 break;
1473 default:
1474 rc = -ENODEV;
1475 reason = "unsupported class";
1476 goto err_out;
1477 }
1478
1479 tf.protocol = ATA_PROT_PIO;
Tejun Heo800b3992006-12-03 21:34:13 +09001480 tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
Tejun Heo49016ac2006-02-21 02:12:11 +09001481
Tejun Heo3373efd2006-05-15 20:57:53 +09001482 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo49016ac2006-02-21 02:12:11 +09001483 id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo49016ac2006-02-21 02:12:11 +09001484 if (err_mask) {
Tejun Heo800b3992006-12-03 21:34:13 +09001485 if (err_mask & AC_ERR_NODEV_HINT) {
Tejun Heo55a8e2c2006-11-10 18:08:10 +09001486 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1487 ap->id, dev->devno);
1488 return -ENOENT;
1489 }
1490
Tejun Heo49016ac2006-02-21 02:12:11 +09001491 rc = -EIO;
1492 reason = "I/O error";
Tejun Heo49016ac2006-02-21 02:12:11 +09001493 goto err_out;
1494 }
1495
1496 swap_buf_le16(id, ATA_ID_WORDS);
1497
Tejun Heo49016ac2006-02-21 02:12:11 +09001498 /* sanity check */
Tejun Heoa4f57492006-09-12 20:35:49 -07001499 rc = -EINVAL;
1500 reason = "device reports illegal type";
1501
1502 if (class == ATA_DEV_ATA) {
1503 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1504 goto err_out;
1505 } else {
1506 if (ata_id_is_ata(id))
1507 goto err_out;
Tejun Heo49016ac2006-02-21 02:12:11 +09001508 }
1509
Tejun Heobff04642006-11-10 18:08:10 +09001510 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
Tejun Heo49016ac2006-02-21 02:12:11 +09001511 /*
1512 * The exact sequence expected by certain pre-ATA4 drives is:
1513 * SRST RESET
1514 * IDENTIFY
1515 * INITIALIZE DEVICE PARAMETERS
1516 * anything else..
1517 * Some drives were very specific about that exact sequence.
1518 */
1519 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001520 err_mask = ata_dev_init_params(dev, id[3], id[6]);
Tejun Heo49016ac2006-02-21 02:12:11 +09001521 if (err_mask) {
1522 rc = -EIO;
1523 reason = "INIT_DEV_PARAMS failed";
1524 goto err_out;
1525 }
1526
1527 /* current CHS translation info (id[53-58]) might be
1528 * changed. reread the identify device info.
1529 */
Tejun Heobff04642006-11-10 18:08:10 +09001530 flags &= ~ATA_READID_POSTRESET;
Tejun Heo49016ac2006-02-21 02:12:11 +09001531 goto retry;
1532 }
1533 }
1534
1535 *p_class = class;
Tejun Heofe635c72006-05-15 20:57:35 +09001536
Tejun Heo49016ac2006-02-21 02:12:11 +09001537 return 0;
1538
1539 err_out:
Tejun Heo88574552006-06-25 20:00:35 +09001540 if (ata_msg_warn(ap))
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001541 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
Tejun Heo88574552006-06-25 20:00:35 +09001542 "(%s, err_mask=0x%x)\n", reason, err_mask);
Tejun Heo49016ac2006-02-21 02:12:11 +09001543 return rc;
1544}
1545
Tejun Heo3373efd2006-05-15 20:57:53 +09001546static inline u8 ata_dev_knobble(struct ata_device *dev)
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001547{
Tejun Heo3373efd2006-05-15 20:57:53 +09001548 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001549}
1550
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001551static void ata_dev_config_ncq(struct ata_device *dev,
1552 char *desc, size_t desc_sz)
1553{
1554 struct ata_port *ap = dev->ap;
1555 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1556
1557 if (!ata_id_has_ncq(dev->id)) {
1558 desc[0] = '\0';
1559 return;
1560 }
Alan Cox6919a0a2006-10-27 19:08:46 -07001561 if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
1562 snprintf(desc, desc_sz, "NCQ (not used)");
1563 return;
1564 }
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001565 if (ap->flags & ATA_FLAG_NCQ) {
Jeff Garzikcca39742006-08-24 03:19:22 -04001566 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001567 dev->flags |= ATA_DFLAG_NCQ;
1568 }
1569
1570 if (hdepth >= ddepth)
1571 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1572 else
1573 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1574}
1575
Brian Kinge6d902a2006-06-28 08:30:31 -05001576static void ata_set_port_max_cmd_len(struct ata_port *ap)
1577{
1578 int i;
1579
Jeff Garzikcca39742006-08-24 03:19:22 -04001580 if (ap->scsi_host) {
1581 unsigned int len = 0;
1582
Brian Kinge6d902a2006-06-28 08:30:31 -05001583 for (i = 0; i < ATA_MAX_DEVICES; i++)
Jeff Garzikcca39742006-08-24 03:19:22 -04001584 len = max(len, ap->device[i].cdb_len);
1585
1586 ap->scsi_host->max_cmd_len = len;
Brian Kinge6d902a2006-06-28 08:30:31 -05001587 }
1588}
1589
Tejun Heo49016ac2006-02-21 02:12:11 +09001590/**
Tejun Heoffeae412006-03-01 16:09:35 +09001591 * ata_dev_configure - Configure the specified ATA/ATAPI device
Tejun Heoffeae412006-03-01 16:09:35 +09001592 * @dev: Target device to configure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 *
Tejun Heoffeae412006-03-01 16:09:35 +09001594 * Configure @dev according to @dev->id. Generic and low-level
1595 * driver specific fixups are also applied.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 *
1597 * LOCKING:
Tejun Heoffeae412006-03-01 16:09:35 +09001598 * Kernel thread context (may sleep)
1599 *
1600 * RETURNS:
1601 * 0 on success, -errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 */
Tejun Heoefdaedc2006-11-01 18:38:52 +09001603int ata_dev_configure(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604{
Tejun Heo3373efd2006-05-15 20:57:53 +09001605 struct ata_port *ap = dev->ap;
Tejun Heoefdaedc2006-11-01 18:38:52 +09001606 int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001607 const u16 *id = dev->id;
Tejun Heoff8854b2006-03-06 04:31:56 +09001608 unsigned int xfer_mask;
Alan Coxb352e572006-08-10 18:52:12 +01001609 char revbuf[7]; /* XYZ-99\0 */
Brian Kinge6d902a2006-06-28 08:30:31 -05001610 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001612 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
Tejun Heo88574552006-06-25 20:00:35 +09001613 ata_dev_printk(dev, KERN_INFO,
1614 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1615 __FUNCTION__, ap->id, dev->devno);
Tejun Heoffeae412006-03-01 16:09:35 +09001616 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 }
1618
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001619 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001620 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
1621 __FUNCTION__, ap->id, dev->devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001623 /* print device capabilities */
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001624 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001625 ata_dev_printk(dev, KERN_DEBUG,
1626 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1627 "85:%04x 86:%04x 87:%04x 88:%04x\n",
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001628 __FUNCTION__,
Tejun Heof15a1da2006-05-15 20:57:56 +09001629 id[49], id[82], id[83], id[84],
1630 id[85], id[86], id[87], id[88]);
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001631
Tejun Heo208a9932006-03-05 17:55:58 +09001632 /* initialize to-be-configured parameters */
Tejun Heoea1dd4e2006-04-02 18:51:53 +09001633 dev->flags &= ~ATA_DFLAG_CFG_MASK;
Tejun Heo208a9932006-03-05 17:55:58 +09001634 dev->max_sectors = 0;
1635 dev->cdb_len = 0;
1636 dev->n_sectors = 0;
1637 dev->cylinders = 0;
1638 dev->heads = 0;
1639 dev->sectors = 0;
1640
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 /*
1642 * common ATA, ATAPI feature tests
1643 */
1644
Tejun Heoff8854b2006-03-06 04:31:56 +09001645 /* find max transfer mode; for printk only */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001646 xfer_mask = ata_id_xfermask(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001648 if (ata_msg_probe(ap))
1649 ata_dump_id(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650
1651 /* ATA-specific feature tests */
1652 if (dev->class == ATA_DEV_ATA) {
Alan Coxb352e572006-08-10 18:52:12 +01001653 if (ata_id_is_cfa(id)) {
1654 if (id[162] & 1) /* CPRM may make this media unusable */
1655 ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u supports DRM functions and may not be fully accessable.\n",
1656 ap->id, dev->devno);
1657 snprintf(revbuf, 7, "CFA");
1658 }
1659 else
1660 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
1661
Tejun Heo1148c3a2006-03-13 19:48:04 +09001662 dev->n_sectors = ata_id_n_sectors(id);
Tejun Heo29407402006-02-12 22:47:04 +09001663
Tejun Heo1148c3a2006-03-13 19:48:04 +09001664 if (ata_id_has_lba(id)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001665 const char *lba_desc;
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001666 char ncq_desc[20];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001667
Tejun Heo4c2d7212006-03-05 17:55:58 +09001668 lba_desc = "LBA";
1669 dev->flags |= ATA_DFLAG_LBA;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001670 if (ata_id_has_lba48(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001671 dev->flags |= ATA_DFLAG_LBA48;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001672 lba_desc = "LBA48";
Tejun Heo6fc49ad2006-11-11 20:10:45 +09001673
1674 if (dev->n_sectors >= (1UL << 28) &&
1675 ata_id_has_flush_ext(id))
1676 dev->flags |= ATA_DFLAG_FLUSH_EXT;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001677 }
Albert Lee8bf62ece2005-05-12 15:29:42 -04001678
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001679 /* config NCQ */
1680 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1681
Albert Lee8bf62ece2005-05-12 15:29:42 -04001682 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001683 if (ata_msg_drv(ap) && print_info)
Alan Coxb352e572006-08-10 18:52:12 +01001684 ata_dev_printk(dev, KERN_INFO, "%s, "
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001685 "max %s, %Lu sectors: %s %s\n",
Alan Coxb352e572006-08-10 18:52:12 +01001686 revbuf,
Tejun Heof15a1da2006-05-15 20:57:56 +09001687 ata_mode_string(xfer_mask),
1688 (unsigned long long)dev->n_sectors,
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001689 lba_desc, ncq_desc);
Tejun Heoffeae412006-03-01 16:09:35 +09001690 } else {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001691 /* CHS */
1692
1693 /* Default translation */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001694 dev->cylinders = id[1];
1695 dev->heads = id[3];
1696 dev->sectors = id[6];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001697
Tejun Heo1148c3a2006-03-13 19:48:04 +09001698 if (ata_id_current_chs_valid(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001699 /* Current CHS translation is valid. */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001700 dev->cylinders = id[54];
1701 dev->heads = id[55];
1702 dev->sectors = id[56];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001703 }
1704
1705 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001706 if (ata_msg_drv(ap) && print_info)
Alan Coxb352e572006-08-10 18:52:12 +01001707 ata_dev_printk(dev, KERN_INFO, "%s, "
Tejun Heof15a1da2006-05-15 20:57:56 +09001708 "max %s, %Lu sectors: CHS %u/%u/%u\n",
Alan Coxb352e572006-08-10 18:52:12 +01001709 revbuf,
Tejun Heof15a1da2006-05-15 20:57:56 +09001710 ata_mode_string(xfer_mask),
1711 (unsigned long long)dev->n_sectors,
Tejun Heo88574552006-06-25 20:00:35 +09001712 dev->cylinders, dev->heads,
1713 dev->sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 }
1715
Albert Lee07f6f7d2005-11-01 19:33:20 +08001716 if (dev->id[59] & 0x100) {
1717 dev->multi_count = dev->id[59] & 0xff;
Borislav Petkov5afc8142006-06-27 14:51:25 +02001718 if (ata_msg_drv(ap) && print_info)
Tejun Heo88574552006-06-25 20:00:35 +09001719 ata_dev_printk(dev, KERN_INFO,
1720 "ata%u: dev %u multi count %u\n",
1721 ap->id, dev->devno, dev->multi_count);
Albert Lee07f6f7d2005-11-01 19:33:20 +08001722 }
1723
Tejun Heo6e7846e2006-02-12 23:32:58 +09001724 dev->cdb_len = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 }
1726
1727 /* ATAPI-specific feature tests */
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05001728 else if (dev->class == ATA_DEV_ATAPI) {
Albert Lee08a556d2006-03-31 13:29:04 +08001729 char *cdb_intr_string = "";
1730
Tejun Heo1148c3a2006-03-13 19:48:04 +09001731 rc = atapi_cdb_len(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001733 if (ata_msg_warn(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001734 ata_dev_printk(dev, KERN_WARNING,
1735 "unsupported CDB len\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001736 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 goto err_out_nosup;
1738 }
Tejun Heo6e7846e2006-02-12 23:32:58 +09001739 dev->cdb_len = (unsigned int) rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740
Albert Lee08a556d2006-03-31 13:29:04 +08001741 if (ata_id_cdb_intr(dev->id)) {
Albert Lee312f7da2005-09-27 17:38:03 +08001742 dev->flags |= ATA_DFLAG_CDB_INTR;
Albert Lee08a556d2006-03-31 13:29:04 +08001743 cdb_intr_string = ", CDB intr";
1744 }
Albert Lee312f7da2005-09-27 17:38:03 +08001745
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001747 if (ata_msg_drv(ap) && print_info)
Tejun Heo12436c32006-05-15 20:59:15 +09001748 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
1749 ata_mode_string(xfer_mask),
1750 cdb_intr_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 }
1752
Tejun Heo914ed352006-11-01 18:39:55 +09001753 /* determine max_sectors */
1754 dev->max_sectors = ATA_MAX_SECTORS;
1755 if (dev->flags & ATA_DFLAG_LBA48)
1756 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
1757
Alan Cox93590852006-09-12 16:55:12 +01001758 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
1759 /* Let the user know. We don't want to disallow opens for
1760 rescue purposes, or in case the vendor is just a blithering
1761 idiot */
1762 if (print_info) {
1763 ata_dev_printk(dev, KERN_WARNING,
1764"Drive reports diagnostics failure. This may indicate a drive\n");
1765 ata_dev_printk(dev, KERN_WARNING,
1766"fault or invalid emulation. Contact drive vendor for information.\n");
1767 }
1768 }
1769
Brian Kinge6d902a2006-06-28 08:30:31 -05001770 ata_set_port_max_cmd_len(ap);
Tejun Heo6e7846e2006-02-12 23:32:58 +09001771
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001772 /* limit bridge transfers to udma5, 200 sectors */
Tejun Heo3373efd2006-05-15 20:57:53 +09001773 if (ata_dev_knobble(dev)) {
Borislav Petkov5afc8142006-06-27 14:51:25 +02001774 if (ata_msg_drv(ap) && print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001775 ata_dev_printk(dev, KERN_INFO,
1776 "applying bridge limits\n");
Tejun Heo5a529132006-03-24 14:07:50 +09001777 dev->udma_mask &= ATA_UDMA5;
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001778 dev->max_sectors = ATA_MAX_SECTORS;
1779 }
1780
1781 if (ap->ops->dev_config)
1782 ap->ops->dev_config(ap, dev);
1783
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001784 if (ata_msg_probe(ap))
1785 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
1786 __FUNCTION__, ata_chk_status(ap));
Tejun Heoffeae412006-03-01 16:09:35 +09001787 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788
1789err_out_nosup:
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001790 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001791 ata_dev_printk(dev, KERN_DEBUG,
1792 "%s: EXIT, err\n", __FUNCTION__);
Tejun Heoffeae412006-03-01 16:09:35 +09001793 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794}
1795
1796/**
1797 * ata_bus_probe - Reset and probe ATA bus
1798 * @ap: Bus to probe
1799 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001800 * Master ATA bus probing function. Initiates a hardware-dependent
1801 * bus reset, then attempts to identify any devices found on
1802 * the bus.
1803 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001805 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 *
1807 * RETURNS:
Tejun Heo96072e62006-04-01 01:38:17 +09001808 * Zero on success, negative errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 */
1810
Brian King80289162006-08-07 14:27:31 -05001811int ata_bus_probe(struct ata_port *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812{
Tejun Heo28ca5c52006-03-01 16:09:36 +09001813 unsigned int classes[ATA_MAX_DEVICES];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001814 int tries[ATA_MAX_DEVICES];
1815 int i, rc, down_xfermask;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001816 struct ata_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817
Tejun Heo28ca5c52006-03-01 16:09:36 +09001818 ata_port_probe(ap);
1819
Tejun Heo14d2bac2006-04-02 17:54:46 +09001820 for (i = 0; i < ATA_MAX_DEVICES; i++)
1821 tries[i] = ATA_PROBE_MAX_TRIES;
1822
1823 retry:
1824 down_xfermask = 0;
1825
Tejun Heo20444702006-03-13 01:57:01 +09001826 /* reset and determine device classes */
Tejun Heo52783c52006-05-31 18:28:22 +09001827 ap->ops->phy_reset(ap);
Tejun Heo2061a472006-03-12 00:57:39 +09001828
Tejun Heo52783c52006-05-31 18:28:22 +09001829 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1830 dev = &ap->device[i];
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001831
Tejun Heo52783c52006-05-31 18:28:22 +09001832 if (!(ap->flags & ATA_FLAG_DISABLED) &&
1833 dev->class != ATA_DEV_UNKNOWN)
1834 classes[dev->devno] = dev->class;
1835 else
1836 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heo20444702006-03-13 01:57:01 +09001837
Tejun Heo52783c52006-05-31 18:28:22 +09001838 dev->class = ATA_DEV_UNKNOWN;
Tejun Heo28ca5c52006-03-01 16:09:36 +09001839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
Tejun Heo52783c52006-05-31 18:28:22 +09001841 ata_port_probe(ap);
Tejun Heo20444702006-03-13 01:57:01 +09001842
Alan Coxb6079ca2006-05-22 16:52:06 +01001843 /* after the reset the device state is PIO 0 and the controller
1844 state is undefined. Record the mode */
1845
1846 for (i = 0; i < ATA_MAX_DEVICES; i++)
1847 ap->device[i].pio_mode = XFER_PIO_0;
1848
Tejun Heo28ca5c52006-03-01 16:09:36 +09001849 /* read IDENTIFY page and configure devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001851 dev = &ap->device[i];
Tejun Heo28ca5c52006-03-01 16:09:36 +09001852
Tejun Heoec573752006-04-11 22:26:29 +09001853 if (tries[i])
1854 dev->class = classes[i];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001855
Tejun Heoe1211e32006-04-01 01:38:18 +09001856 if (!ata_dev_enabled(dev))
Tejun Heoffeae412006-03-01 16:09:35 +09001857 continue;
1858
Tejun Heobff04642006-11-10 18:08:10 +09001859 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
1860 dev->id);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001861 if (rc)
1862 goto fail;
Tejun Heoffeae412006-03-01 16:09:35 +09001863
Tejun Heoefdaedc2006-11-01 18:38:52 +09001864 ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
1865 rc = ata_dev_configure(dev);
1866 ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001867 if (rc)
1868 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 }
1870
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001871 /* configure transfer mode */
Tejun Heo3adcebb2006-05-15 20:57:37 +09001872 rc = ata_set_mode(ap, &dev);
Tejun Heo51713d32006-04-11 22:26:29 +09001873 if (rc) {
1874 down_xfermask = 1;
1875 goto fail;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001876 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001878 for (i = 0; i < ATA_MAX_DEVICES; i++)
1879 if (ata_dev_enabled(&ap->device[i]))
1880 return 0;
Alan Coxe35a9e02006-03-27 18:46:37 +01001881
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001882 /* no device present, disable port */
1883 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 ap->ops->port_disable(ap);
Tejun Heo96072e62006-04-01 01:38:17 +09001885 return -ENODEV;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001886
1887 fail:
1888 switch (rc) {
1889 case -EINVAL:
1890 case -ENODEV:
1891 tries[dev->devno] = 0;
1892 break;
1893 case -EIO:
Tejun Heo3c567b72006-05-15 20:57:23 +09001894 sata_down_spd_limit(ap);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001895 /* fall through */
1896 default:
1897 tries[dev->devno]--;
1898 if (down_xfermask &&
Tejun Heo3373efd2006-05-15 20:57:53 +09001899 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
Tejun Heo14d2bac2006-04-02 17:54:46 +09001900 tries[dev->devno] = 0;
1901 }
1902
Tejun Heoec573752006-04-11 22:26:29 +09001903 if (!tries[dev->devno]) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001904 ata_down_xfermask_limit(dev, 1);
1905 ata_dev_disable(dev);
Tejun Heoec573752006-04-11 22:26:29 +09001906 }
1907
Tejun Heo14d2bac2006-04-02 17:54:46 +09001908 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909}
1910
1911/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001912 * ata_port_probe - Mark port as enabled
1913 * @ap: Port for which we indicate enablement
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001915 * Modify @ap data structure such that the system
1916 * thinks that the entire port is enabled.
1917 *
Jeff Garzikcca39742006-08-24 03:19:22 -04001918 * LOCKING: host lock, or some other form of
Jeff Garzik0cba6322005-05-30 19:49:12 -04001919 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 */
1921
1922void ata_port_probe(struct ata_port *ap)
1923{
Tejun Heo198e0fe2006-04-02 18:51:52 +09001924 ap->flags &= ~ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925}
1926
1927/**
Tejun Heo3be680b2005-12-19 22:35:02 +09001928 * sata_print_link_status - Print SATA link status
1929 * @ap: SATA port to printk link status about
1930 *
1931 * This function prints link speed and status of a SATA link.
1932 *
1933 * LOCKING:
1934 * None.
1935 */
1936static void sata_print_link_status(struct ata_port *ap)
1937{
Tejun Heo6d5f9732006-04-03 00:09:41 +09001938 u32 sstatus, scontrol, tmp;
Tejun Heo3be680b2005-12-19 22:35:02 +09001939
Tejun Heo81952c52006-05-15 20:57:47 +09001940 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
Tejun Heo3be680b2005-12-19 22:35:02 +09001941 return;
Tejun Heo81952c52006-05-15 20:57:47 +09001942 sata_scr_read(ap, SCR_CONTROL, &scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001943
Tejun Heo81952c52006-05-15 20:57:47 +09001944 if (ata_port_online(ap)) {
Tejun Heo3be680b2005-12-19 22:35:02 +09001945 tmp = (sstatus >> 4) & 0xf;
Tejun Heof15a1da2006-05-15 20:57:56 +09001946 ata_port_printk(ap, KERN_INFO,
1947 "SATA link up %s (SStatus %X SControl %X)\n",
1948 sata_spd_string(tmp), sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001949 } else {
Tejun Heof15a1da2006-05-15 20:57:56 +09001950 ata_port_printk(ap, KERN_INFO,
1951 "SATA link down (SStatus %X SControl %X)\n",
1952 sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001953 }
1954}
1955
1956/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001957 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1958 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001960 * This function issues commands to standard SATA Sxxx
1961 * PHY registers, to wake up the phy (and device), and
1962 * clear any reset condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 *
1964 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001965 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 *
1967 */
1968void __sata_phy_reset(struct ata_port *ap)
1969{
1970 u32 sstatus;
1971 unsigned long timeout = jiffies + (HZ * 5);
1972
1973 if (ap->flags & ATA_FLAG_SATA_RESET) {
Brett Russcdcca89e2005-03-28 15:10:27 -05001974 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09001975 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
Tejun Heo62ba2842005-06-26 23:27:19 +09001976 /* Couldn't find anything in SATA I/II specs, but
1977 * AHCI-1.1 10.4.2 says at least 1 ms. */
1978 mdelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 }
Tejun Heo81952c52006-05-15 20:57:47 +09001980 /* phy wake/clear reset */
1981 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982
1983 /* wait for phy to become ready, if necessary */
1984 do {
1985 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09001986 sata_scr_read(ap, SCR_STATUS, &sstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 if ((sstatus & 0xf) != 1)
1988 break;
1989 } while (time_before(jiffies, timeout));
1990
Tejun Heo3be680b2005-12-19 22:35:02 +09001991 /* print link status */
1992 sata_print_link_status(ap);
Jeff Garzik656563e2005-11-20 03:36:45 -05001993
Tejun Heo3be680b2005-12-19 22:35:02 +09001994 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09001995 if (!ata_port_offline(ap))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 ata_port_probe(ap);
Tejun Heo3be680b2005-12-19 22:35:02 +09001997 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999
Tejun Heo198e0fe2006-04-02 18:51:52 +09002000 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 return;
2002
2003 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2004 ata_port_disable(ap);
2005 return;
2006 }
2007
2008 ap->cbl = ATA_CBL_SATA;
2009}
2010
2011/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04002012 * sata_phy_reset - Reset SATA bus.
2013 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002015 * This function resets the SATA bus, and then probes
2016 * the bus for devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 *
2018 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002019 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 *
2021 */
2022void sata_phy_reset(struct ata_port *ap)
2023{
2024 __sata_phy_reset(ap);
Tejun Heo198e0fe2006-04-02 18:51:52 +09002025 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 return;
2027 ata_bus_reset(ap);
2028}
2029
2030/**
Alan Coxebdfca62006-03-23 15:38:34 +00002031 * ata_dev_pair - return other device on cable
Alan Coxebdfca62006-03-23 15:38:34 +00002032 * @adev: device
2033 *
2034 * Obtain the other device on the same cable, or if none is
2035 * present NULL is returned
2036 */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002037
Tejun Heo3373efd2006-05-15 20:57:53 +09002038struct ata_device *ata_dev_pair(struct ata_device *adev)
Alan Coxebdfca62006-03-23 15:38:34 +00002039{
Tejun Heo3373efd2006-05-15 20:57:53 +09002040 struct ata_port *ap = adev->ap;
Alan Coxebdfca62006-03-23 15:38:34 +00002041 struct ata_device *pair = &ap->device[1 - adev->devno];
Tejun Heoe1211e32006-04-01 01:38:18 +09002042 if (!ata_dev_enabled(pair))
Alan Coxebdfca62006-03-23 15:38:34 +00002043 return NULL;
2044 return pair;
2045}
2046
2047/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04002048 * ata_port_disable - Disable port.
2049 * @ap: Port to be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002051 * Modify @ap data structure such that the system
2052 * thinks that the entire port is disabled, and should
2053 * never attempt to probe or communicate with devices
2054 * on this port.
2055 *
Jeff Garzikcca39742006-08-24 03:19:22 -04002056 * LOCKING: host lock, or some other form of
Jeff Garzik780a87f2005-05-30 15:41:05 -04002057 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 */
2059
2060void ata_port_disable(struct ata_port *ap)
2061{
2062 ap->device[0].class = ATA_DEV_NONE;
2063 ap->device[1].class = ATA_DEV_NONE;
Tejun Heo198e0fe2006-04-02 18:51:52 +09002064 ap->flags |= ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065}
2066
Tejun Heo1c3fae42006-04-02 20:53:28 +09002067/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002068 * sata_down_spd_limit - adjust SATA spd limit downward
Tejun Heo1c3fae42006-04-02 20:53:28 +09002069 * @ap: Port to adjust SATA spd limit for
2070 *
2071 * Adjust SATA spd limit of @ap downward. Note that this
2072 * function only adjusts the limit. The change must be applied
Tejun Heo3c567b72006-05-15 20:57:23 +09002073 * using sata_set_spd().
Tejun Heo1c3fae42006-04-02 20:53:28 +09002074 *
2075 * LOCKING:
2076 * Inherited from caller.
2077 *
2078 * RETURNS:
2079 * 0 on success, negative errno on failure
2080 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002081int sata_down_spd_limit(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002082{
Tejun Heo81952c52006-05-15 20:57:47 +09002083 u32 sstatus, spd, mask;
2084 int rc, highbit;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002085
Tejun Heo81952c52006-05-15 20:57:47 +09002086 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
2087 if (rc)
2088 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002089
2090 mask = ap->sata_spd_limit;
2091 if (mask <= 1)
2092 return -EINVAL;
2093 highbit = fls(mask) - 1;
2094 mask &= ~(1 << highbit);
2095
Tejun Heo81952c52006-05-15 20:57:47 +09002096 spd = (sstatus >> 4) & 0xf;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002097 if (spd <= 1)
2098 return -EINVAL;
2099 spd--;
2100 mask &= (1 << spd) - 1;
2101 if (!mask)
2102 return -EINVAL;
2103
2104 ap->sata_spd_limit = mask;
2105
Tejun Heof15a1da2006-05-15 20:57:56 +09002106 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
2107 sata_spd_string(fls(mask)));
Tejun Heo1c3fae42006-04-02 20:53:28 +09002108
2109 return 0;
2110}
2111
Tejun Heo3c567b72006-05-15 20:57:23 +09002112static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002113{
2114 u32 spd, limit;
2115
2116 if (ap->sata_spd_limit == UINT_MAX)
2117 limit = 0;
2118 else
2119 limit = fls(ap->sata_spd_limit);
2120
2121 spd = (*scontrol >> 4) & 0xf;
2122 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
2123
2124 return spd != limit;
2125}
2126
2127/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002128 * sata_set_spd_needed - is SATA spd configuration needed
Tejun Heo1c3fae42006-04-02 20:53:28 +09002129 * @ap: Port in question
2130 *
2131 * Test whether the spd limit in SControl matches
2132 * @ap->sata_spd_limit. This function is used to determine
2133 * whether hardreset is necessary to apply SATA spd
2134 * configuration.
2135 *
2136 * LOCKING:
2137 * Inherited from caller.
2138 *
2139 * RETURNS:
2140 * 1 if SATA spd configuration is needed, 0 otherwise.
2141 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002142int sata_set_spd_needed(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002143{
2144 u32 scontrol;
2145
Tejun Heo81952c52006-05-15 20:57:47 +09002146 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09002147 return 0;
2148
Tejun Heo3c567b72006-05-15 20:57:23 +09002149 return __sata_set_spd_needed(ap, &scontrol);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002150}
2151
2152/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002153 * sata_set_spd - set SATA spd according to spd limit
Tejun Heo1c3fae42006-04-02 20:53:28 +09002154 * @ap: Port to set SATA spd for
2155 *
2156 * Set SATA spd of @ap according to sata_spd_limit.
2157 *
2158 * LOCKING:
2159 * Inherited from caller.
2160 *
2161 * RETURNS:
2162 * 0 if spd doesn't need to be changed, 1 if spd has been
Tejun Heo81952c52006-05-15 20:57:47 +09002163 * changed. Negative errno if SCR registers are inaccessible.
Tejun Heo1c3fae42006-04-02 20:53:28 +09002164 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002165int sata_set_spd(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002166{
2167 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002168 int rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002169
Tejun Heo81952c52006-05-15 20:57:47 +09002170 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2171 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002172
Tejun Heo3c567b72006-05-15 20:57:23 +09002173 if (!__sata_set_spd_needed(ap, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09002174 return 0;
2175
Tejun Heo81952c52006-05-15 20:57:47 +09002176 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2177 return rc;
2178
Tejun Heo1c3fae42006-04-02 20:53:28 +09002179 return 1;
2180}
2181
Alan Cox452503f2005-10-21 19:01:32 -04002182/*
2183 * This mode timing computation functionality is ported over from
2184 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2185 */
2186/*
Alan Coxb352e572006-08-10 18:52:12 +01002187 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
Alan Cox452503f2005-10-21 19:01:32 -04002188 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
Alan Coxb352e572006-08-10 18:52:12 +01002189 * for UDMA6, which is currently supported only by Maxtor drives.
2190 *
2191 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
Alan Cox452503f2005-10-21 19:01:32 -04002192 */
2193
2194static const struct ata_timing ata_timing[] = {
2195
2196 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2197 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2198 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2199 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2200
Alan Coxb352e572006-08-10 18:52:12 +01002201 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2202 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
Alan Cox452503f2005-10-21 19:01:32 -04002203 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2204 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2205 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2206
2207/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002208
Alan Cox452503f2005-10-21 19:01:32 -04002209 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2210 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2211 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002212
Alan Cox452503f2005-10-21 19:01:32 -04002213 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2214 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2215 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2216
Alan Coxb352e572006-08-10 18:52:12 +01002217 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2218 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
Alan Cox452503f2005-10-21 19:01:32 -04002219 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2220 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2221
2222 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2223 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2224 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2225
2226/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2227
2228 { 0xFF }
2229};
2230
2231#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2232#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2233
2234static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2235{
2236 q->setup = EZ(t->setup * 1000, T);
2237 q->act8b = EZ(t->act8b * 1000, T);
2238 q->rec8b = EZ(t->rec8b * 1000, T);
2239 q->cyc8b = EZ(t->cyc8b * 1000, T);
2240 q->active = EZ(t->active * 1000, T);
2241 q->recover = EZ(t->recover * 1000, T);
2242 q->cycle = EZ(t->cycle * 1000, T);
2243 q->udma = EZ(t->udma * 1000, UT);
2244}
2245
2246void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2247 struct ata_timing *m, unsigned int what)
2248{
2249 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2250 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2251 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2252 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2253 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2254 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2255 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2256 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2257}
2258
2259static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
2260{
2261 const struct ata_timing *t;
2262
2263 for (t = ata_timing; t->mode != speed; t++)
Alan Cox91190752005-10-26 12:17:46 -04002264 if (t->mode == 0xFF)
Alan Cox452503f2005-10-21 19:01:32 -04002265 return NULL;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002266 return t;
Alan Cox452503f2005-10-21 19:01:32 -04002267}
2268
2269int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2270 struct ata_timing *t, int T, int UT)
2271{
2272 const struct ata_timing *s;
2273 struct ata_timing p;
2274
2275 /*
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002276 * Find the mode.
Albert Lee75b1f2f2005-11-16 17:06:18 +08002277 */
Alan Cox452503f2005-10-21 19:01:32 -04002278
2279 if (!(s = ata_timing_find_mode(speed)))
2280 return -EINVAL;
2281
Albert Lee75b1f2f2005-11-16 17:06:18 +08002282 memcpy(t, s, sizeof(*s));
2283
Alan Cox452503f2005-10-21 19:01:32 -04002284 /*
2285 * If the drive is an EIDE drive, it can tell us it needs extended
2286 * PIO/MW_DMA cycle timing.
2287 */
2288
2289 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2290 memset(&p, 0, sizeof(p));
2291 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2292 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2293 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2294 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2295 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2296 }
2297 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2298 }
2299
2300 /*
2301 * Convert the timing to bus clock counts.
2302 */
2303
Albert Lee75b1f2f2005-11-16 17:06:18 +08002304 ata_timing_quantize(t, t, T, UT);
Alan Cox452503f2005-10-21 19:01:32 -04002305
2306 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05002307 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2308 * S.M.A.R.T * and some other commands. We have to ensure that the
2309 * DMA cycle timing is slower/equal than the fastest PIO timing.
Alan Cox452503f2005-10-21 19:01:32 -04002310 */
2311
Alanfd3367af2006-12-07 12:41:18 +00002312 if (speed > XFER_PIO_6) {
Alan Cox452503f2005-10-21 19:01:32 -04002313 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2314 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2315 }
2316
2317 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05002318 * Lengthen active & recovery time so that cycle time is correct.
Alan Cox452503f2005-10-21 19:01:32 -04002319 */
2320
2321 if (t->act8b + t->rec8b < t->cyc8b) {
2322 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2323 t->rec8b = t->cyc8b - t->act8b;
2324 }
2325
2326 if (t->active + t->recover < t->cycle) {
2327 t->active += (t->cycle - (t->active + t->recover)) / 2;
2328 t->recover = t->cycle - t->active;
2329 }
2330
2331 return 0;
2332}
2333
Tejun Heocf176e12006-04-02 17:54:46 +09002334/**
2335 * ata_down_xfermask_limit - adjust dev xfer masks downward
Tejun Heocf176e12006-04-02 17:54:46 +09002336 * @dev: Device to adjust xfer masks
2337 * @force_pio0: Force PIO0
2338 *
2339 * Adjust xfer masks of @dev downward. Note that this function
2340 * does not apply the change. Invoking ata_set_mode() afterwards
2341 * will apply the limit.
2342 *
2343 * LOCKING:
2344 * Inherited from caller.
2345 *
2346 * RETURNS:
2347 * 0 on success, negative errno on failure
2348 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002349int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
Tejun Heocf176e12006-04-02 17:54:46 +09002350{
2351 unsigned long xfer_mask;
2352 int highbit;
2353
2354 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
2355 dev->udma_mask);
2356
2357 if (!xfer_mask)
2358 goto fail;
2359 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2360 if (xfer_mask & ATA_MASK_UDMA)
2361 xfer_mask &= ~ATA_MASK_MWDMA;
2362
2363 highbit = fls(xfer_mask) - 1;
2364 xfer_mask &= ~(1 << highbit);
2365 if (force_pio0)
2366 xfer_mask &= 1 << ATA_SHIFT_PIO;
2367 if (!xfer_mask)
2368 goto fail;
2369
2370 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2371 &dev->udma_mask);
2372
Tejun Heof15a1da2006-05-15 20:57:56 +09002373 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
2374 ata_mode_string(xfer_mask));
Tejun Heocf176e12006-04-02 17:54:46 +09002375
2376 return 0;
2377
2378 fail:
2379 return -EINVAL;
2380}
2381
Tejun Heo3373efd2006-05-15 20:57:53 +09002382static int ata_dev_set_mode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383{
Tejun Heobaa1e782006-11-01 18:39:27 +09002384 struct ata_eh_context *ehc = &dev->ap->eh_context;
Tejun Heo83206a22006-03-24 15:25:31 +09002385 unsigned int err_mask;
2386 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387
Tejun Heoe8384602006-04-02 18:51:53 +09002388 dev->flags &= ~ATA_DFLAG_PIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389 if (dev->xfer_shift == ATA_SHIFT_PIO)
2390 dev->flags |= ATA_DFLAG_PIO;
2391
Tejun Heo3373efd2006-05-15 20:57:53 +09002392 err_mask = ata_dev_set_xfermode(dev);
Tejun Heo83206a22006-03-24 15:25:31 +09002393 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002394 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2395 "(err_mask=0x%x)\n", err_mask);
Tejun Heo83206a22006-03-24 15:25:31 +09002396 return -EIO;
2397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398
Tejun Heobaa1e782006-11-01 18:39:27 +09002399 ehc->i.flags |= ATA_EHI_POST_SETMODE;
Tejun Heo3373efd2006-05-15 20:57:53 +09002400 rc = ata_dev_revalidate(dev, 0);
Tejun Heobaa1e782006-11-01 18:39:27 +09002401 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
Tejun Heo5eb45c02006-04-02 18:51:52 +09002402 if (rc)
Tejun Heo83206a22006-03-24 15:25:31 +09002403 return rc;
Tejun Heo48a8a142006-03-05 17:55:58 +09002404
Tejun Heo23e71c32006-03-06 04:31:57 +09002405 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2406 dev->xfer_shift, (int)dev->xfer_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407
Tejun Heof15a1da2006-05-15 20:57:56 +09002408 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2409 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
Tejun Heo83206a22006-03-24 15:25:31 +09002410 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411}
2412
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413/**
2414 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2415 * @ap: port on which timings will be programmed
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002416 * @r_failed_dev: out paramter for failed device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 *
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002418 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2419 * ata_set_mode() fails, pointer to the failing device is
2420 * returned in @r_failed_dev.
Jeff Garzik780a87f2005-05-30 15:41:05 -04002421 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002423 * PCI/etc. bus probe sem.
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002424 *
2425 * RETURNS:
2426 * 0 on success, negative errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 */
Tejun Heo1ad8e7f2006-04-02 18:51:53 +09002428int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429{
Tejun Heoe8e06192006-04-01 01:38:18 +09002430 struct ata_device *dev;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002431 int i, rc = 0, used_dma = 0, found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432
Tejun Heo3adcebb2006-05-15 20:57:37 +09002433 /* has private set_mode? */
2434 if (ap->ops->set_mode) {
2435 /* FIXME: make ->set_mode handle no device case and
2436 * return error code and failing device on failure.
2437 */
2438 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heo02670bf2006-07-03 16:07:26 +09002439 if (ata_dev_ready(&ap->device[i])) {
Tejun Heo3adcebb2006-05-15 20:57:37 +09002440 ap->ops->set_mode(ap);
2441 break;
2442 }
2443 }
2444 return 0;
2445 }
2446
Tejun Heoa6d5a512006-03-06 04:31:57 +09002447 /* step 1: calculate xfer_mask */
2448 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoacf356b2006-03-24 14:07:50 +09002449 unsigned int pio_mask, dma_mask;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002450
Tejun Heoe8e06192006-04-01 01:38:18 +09002451 dev = &ap->device[i];
2452
Tejun Heoe1211e32006-04-01 01:38:18 +09002453 if (!ata_dev_enabled(dev))
Tejun Heoa6d5a512006-03-06 04:31:57 +09002454 continue;
2455
Tejun Heo3373efd2006-05-15 20:57:53 +09002456 ata_dev_xfermask(dev);
Tejun Heoa6d5a512006-03-06 04:31:57 +09002457
Tejun Heoacf356b2006-03-24 14:07:50 +09002458 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2459 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2460 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2461 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
Alan Cox5444a6f2006-03-27 18:58:20 +01002462
Tejun Heo4f659772006-04-01 01:38:18 +09002463 found = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002464 if (dev->dma_mode)
2465 used_dma = 1;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002466 }
Tejun Heo4f659772006-04-01 01:38:18 +09002467 if (!found)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002468 goto out;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002469
2470 /* step 2: always set host PIO timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002471 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2472 dev = &ap->device[i];
2473 if (!ata_dev_enabled(dev))
2474 continue;
2475
2476 if (!dev->pio_mode) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002477 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
Tejun Heoe8e06192006-04-01 01:38:18 +09002478 rc = -EINVAL;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002479 goto out;
Tejun Heoe8e06192006-04-01 01:38:18 +09002480 }
2481
2482 dev->xfer_mode = dev->pio_mode;
2483 dev->xfer_shift = ATA_SHIFT_PIO;
2484 if (ap->ops->set_piomode)
2485 ap->ops->set_piomode(ap, dev);
2486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487
Tejun Heoa6d5a512006-03-06 04:31:57 +09002488 /* step 3: set host DMA timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002489 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2490 dev = &ap->device[i];
2491
2492 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2493 continue;
2494
2495 dev->xfer_mode = dev->dma_mode;
2496 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2497 if (ap->ops->set_dmamode)
2498 ap->ops->set_dmamode(ap, dev);
2499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500
2501 /* step 4: update devices' xfer mode */
Tejun Heo83206a22006-03-24 15:25:31 +09002502 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe8e06192006-04-01 01:38:18 +09002503 dev = &ap->device[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504
Tejun Heo02670bf2006-07-03 16:07:26 +09002505 /* don't udpate suspended devices' xfer mode */
2506 if (!ata_dev_ready(dev))
Tejun Heo83206a22006-03-24 15:25:31 +09002507 continue;
2508
Tejun Heo3373efd2006-05-15 20:57:53 +09002509 rc = ata_dev_set_mode(dev);
Tejun Heo5bbc53f2006-04-01 01:38:17 +09002510 if (rc)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002511 goto out;
Tejun Heo83206a22006-03-24 15:25:31 +09002512 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513
Tejun Heoe8e06192006-04-01 01:38:18 +09002514 /* Record simplex status. If we selected DMA then the other
2515 * host channels are not permitted to do so.
Alan Cox5444a6f2006-03-27 18:58:20 +01002516 */
Jeff Garzikcca39742006-08-24 03:19:22 -04002517 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
2518 ap->host->simplex_claimed = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002519
Tejun Heoe8e06192006-04-01 01:38:18 +09002520 /* step5: chip specific finalisation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 if (ap->ops->post_set_mode)
2522 ap->ops->post_set_mode(ap);
2523
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002524 out:
2525 if (rc)
2526 *r_failed_dev = dev;
2527 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528}
2529
2530/**
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002531 * ata_tf_to_host - issue ATA taskfile to host controller
2532 * @ap: port to which command is being issued
2533 * @tf: ATA taskfile register set
2534 *
2535 * Issues ATA taskfile register set to ATA host controller,
2536 * with proper synchronization with interrupt handler and
2537 * other threads.
2538 *
2539 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04002540 * spin_lock_irqsave(host lock)
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002541 */
2542
2543static inline void ata_tf_to_host(struct ata_port *ap,
2544 const struct ata_taskfile *tf)
2545{
2546 ap->ops->tf_load(ap, tf);
2547 ap->ops->exec_command(ap, tf);
2548}
2549
2550/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002551 * ata_busy_sleep - sleep until BSY clears, or timeout
2552 * @ap: port containing status register to be polled
2553 * @tmout_pat: impatience timeout
2554 * @tmout: overall timeout
2555 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002556 * Sleep until ATA Status register bit BSY clears,
2557 * or a timeout occurs.
2558 *
Tejun Heod1adc1b2006-10-09 18:32:15 +09002559 * LOCKING:
2560 * Kernel thread context (may sleep).
2561 *
2562 * RETURNS:
2563 * 0 on success, -errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 */
Tejun Heod1adc1b2006-10-09 18:32:15 +09002565int ata_busy_sleep(struct ata_port *ap,
2566 unsigned long tmout_pat, unsigned long tmout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002567{
2568 unsigned long timer_start, timeout;
2569 u8 status;
2570
2571 status = ata_busy_wait(ap, ATA_BUSY, 300);
2572 timer_start = jiffies;
2573 timeout = timer_start + tmout_pat;
Tejun Heod1adc1b2006-10-09 18:32:15 +09002574 while (status != 0xff && (status & ATA_BUSY) &&
2575 time_before(jiffies, timeout)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576 msleep(50);
2577 status = ata_busy_wait(ap, ATA_BUSY, 3);
2578 }
2579
Tejun Heod1adc1b2006-10-09 18:32:15 +09002580 if (status != 0xff && (status & ATA_BUSY))
Tejun Heof15a1da2006-05-15 20:57:56 +09002581 ata_port_printk(ap, KERN_WARNING,
Jeff Garzik35aa7a42006-09-28 06:50:24 -04002582 "port is slow to respond, please be patient "
2583 "(Status 0x%x)\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584
2585 timeout = timer_start + tmout;
Tejun Heod1adc1b2006-10-09 18:32:15 +09002586 while (status != 0xff && (status & ATA_BUSY) &&
2587 time_before(jiffies, timeout)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 msleep(50);
2589 status = ata_chk_status(ap);
2590 }
2591
Tejun Heod1adc1b2006-10-09 18:32:15 +09002592 if (status == 0xff)
2593 return -ENODEV;
2594
Linus Torvalds1da177e2005-04-16 15:20:36 -07002595 if (status & ATA_BUSY) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002596 ata_port_printk(ap, KERN_ERR, "port failed to respond "
Jeff Garzik35aa7a42006-09-28 06:50:24 -04002597 "(%lu secs, Status 0x%x)\n",
2598 tmout / HZ, status);
Tejun Heod1adc1b2006-10-09 18:32:15 +09002599 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600 }
2601
2602 return 0;
2603}
2604
2605static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2606{
2607 struct ata_ioports *ioaddr = &ap->ioaddr;
2608 unsigned int dev0 = devmask & (1 << 0);
2609 unsigned int dev1 = devmask & (1 << 1);
2610 unsigned long timeout;
2611
2612 /* if device 0 was found in ata_devchk, wait for its
2613 * BSY bit to clear
2614 */
2615 if (dev0)
2616 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2617
2618 /* if device 1 was found in ata_devchk, wait for
2619 * register access, then wait for BSY to clear
2620 */
2621 timeout = jiffies + ATA_TMOUT_BOOT;
2622 while (dev1) {
2623 u8 nsect, lbal;
2624
2625 ap->ops->dev_select(ap, 1);
2626 if (ap->flags & ATA_FLAG_MMIO) {
2627 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2628 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2629 } else {
2630 nsect = inb(ioaddr->nsect_addr);
2631 lbal = inb(ioaddr->lbal_addr);
2632 }
2633 if ((nsect == 1) && (lbal == 1))
2634 break;
2635 if (time_after(jiffies, timeout)) {
2636 dev1 = 0;
2637 break;
2638 }
2639 msleep(50); /* give drive a breather */
2640 }
2641 if (dev1)
2642 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2643
2644 /* is all this really necessary? */
2645 ap->ops->dev_select(ap, 0);
2646 if (dev1)
2647 ap->ops->dev_select(ap, 1);
2648 if (dev0)
2649 ap->ops->dev_select(ap, 0);
2650}
2651
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652static unsigned int ata_bus_softreset(struct ata_port *ap,
2653 unsigned int devmask)
2654{
2655 struct ata_ioports *ioaddr = &ap->ioaddr;
2656
2657 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2658
2659 /* software reset. causes dev0 to be selected */
2660 if (ap->flags & ATA_FLAG_MMIO) {
2661 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2662 udelay(20); /* FIXME: flush */
2663 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2664 udelay(20); /* FIXME: flush */
2665 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2666 } else {
2667 outb(ap->ctl, ioaddr->ctl_addr);
2668 udelay(10);
2669 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2670 udelay(10);
2671 outb(ap->ctl, ioaddr->ctl_addr);
2672 }
2673
2674 /* spec mandates ">= 2ms" before checking status.
2675 * We wait 150ms, because that was the magic delay used for
2676 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2677 * between when the ATA command register is written, and then
2678 * status is checked. Because waiting for "a while" before
2679 * checking status is fine, post SRST, we perform this magic
2680 * delay here as well.
Alan Cox09c7ad72006-03-22 15:52:40 +00002681 *
2682 * Old drivers/ide uses the 2mS rule and then waits for ready
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 */
2684 msleep(150);
2685
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002686 /* Before we perform post reset processing we want to see if
Tejun Heo298a41c2006-03-25 02:58:13 +09002687 * the bus shows 0xFF because the odd clown forgets the D7
2688 * pulldown resistor.
2689 */
Tejun Heod1adc1b2006-10-09 18:32:15 +09002690 if (ata_check_status(ap) == 0xFF)
2691 return 0;
Alan Cox09c7ad72006-03-22 15:52:40 +00002692
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 ata_bus_post_reset(ap, devmask);
2694
2695 return 0;
2696}
2697
2698/**
2699 * ata_bus_reset - reset host port and associated ATA channel
2700 * @ap: port to reset
2701 *
2702 * This is typically the first time we actually start issuing
2703 * commands to the ATA channel. We wait for BSY to clear, then
2704 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2705 * result. Determine what devices, if any, are on the channel
2706 * by looking at the device 0/1 error register. Look at the signature
2707 * stored in each device's taskfile registers, to determine if
2708 * the device is ATA or ATAPI.
2709 *
2710 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002711 * PCI/etc. bus probe sem.
Jeff Garzikcca39742006-08-24 03:19:22 -04002712 * Obtains host lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 *
2714 * SIDE EFFECTS:
Tejun Heo198e0fe2006-04-02 18:51:52 +09002715 * Sets ATA_FLAG_DISABLED if bus reset fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002716 */
2717
2718void ata_bus_reset(struct ata_port *ap)
2719{
2720 struct ata_ioports *ioaddr = &ap->ioaddr;
2721 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2722 u8 err;
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002723 unsigned int dev0, dev1 = 0, devmask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724
2725 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2726
2727 /* determine if device 0/1 are present */
2728 if (ap->flags & ATA_FLAG_SATA_RESET)
2729 dev0 = 1;
2730 else {
2731 dev0 = ata_devchk(ap, 0);
2732 if (slave_possible)
2733 dev1 = ata_devchk(ap, 1);
2734 }
2735
2736 if (dev0)
2737 devmask |= (1 << 0);
2738 if (dev1)
2739 devmask |= (1 << 1);
2740
2741 /* select device 0 again */
2742 ap->ops->dev_select(ap, 0);
2743
2744 /* issue bus reset */
2745 if (ap->flags & ATA_FLAG_SRST)
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002746 if (ata_bus_softreset(ap, devmask))
2747 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748
2749 /*
2750 * determine by signature whether we have ATA or ATAPI devices
2751 */
Tejun Heob4dc7622006-01-24 17:05:22 +09002752 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 if ((slave_possible) && (err != 0x81))
Tejun Heob4dc7622006-01-24 17:05:22 +09002754 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755
2756 /* re-enable interrupts */
2757 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2758 ata_irq_on(ap);
2759
2760 /* is double-select really necessary? */
2761 if (ap->device[1].class != ATA_DEV_NONE)
2762 ap->ops->dev_select(ap, 1);
2763 if (ap->device[0].class != ATA_DEV_NONE)
2764 ap->ops->dev_select(ap, 0);
2765
2766 /* if no devices were detected, disable this port */
2767 if ((ap->device[0].class == ATA_DEV_NONE) &&
2768 (ap->device[1].class == ATA_DEV_NONE))
2769 goto err_out;
2770
2771 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2772 /* set up device control for ATA_FLAG_SATA_RESET */
2773 if (ap->flags & ATA_FLAG_MMIO)
2774 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2775 else
2776 outb(ap->ctl, ioaddr->ctl_addr);
2777 }
2778
2779 DPRINTK("EXIT\n");
2780 return;
2781
2782err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09002783 ata_port_printk(ap, KERN_ERR, "disabling port\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 ap->ops->port_disable(ap);
2785
2786 DPRINTK("EXIT\n");
2787}
2788
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002789/**
2790 * sata_phy_debounce - debounce SATA phy status
2791 * @ap: ATA port to debounce SATA phy status for
2792 * @params: timing parameters { interval, duratinon, timeout } in msec
2793 *
2794 * Make sure SStatus of @ap reaches stable state, determined by
2795 * holding the same value where DET is not 1 for @duration polled
2796 * every @interval, before @timeout. Timeout constraints the
2797 * beginning of the stable state. Because, after hot unplugging,
2798 * DET gets stuck at 1 on some controllers, this functions waits
2799 * until timeout then returns 0 if DET is stable at 1.
2800 *
2801 * LOCKING:
2802 * Kernel thread context (may sleep)
2803 *
2804 * RETURNS:
2805 * 0 on success, -errno on failure.
2806 */
2807int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
Tejun Heo7a7921e2006-02-02 18:20:00 +09002808{
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002809 unsigned long interval_msec = params[0];
2810 unsigned long duration = params[1] * HZ / 1000;
2811 unsigned long timeout = jiffies + params[2] * HZ / 1000;
2812 unsigned long last_jiffies;
2813 u32 last, cur;
2814 int rc;
2815
2816 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
2817 return rc;
2818 cur &= 0xf;
2819
2820 last = cur;
2821 last_jiffies = jiffies;
2822
2823 while (1) {
2824 msleep(interval_msec);
2825 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
2826 return rc;
2827 cur &= 0xf;
2828
2829 /* DET stable? */
2830 if (cur == last) {
2831 if (cur == 1 && time_before(jiffies, timeout))
2832 continue;
2833 if (time_after(jiffies, last_jiffies + duration))
2834 return 0;
2835 continue;
2836 }
2837
2838 /* unstable, start over */
2839 last = cur;
2840 last_jiffies = jiffies;
2841
2842 /* check timeout */
2843 if (time_after(jiffies, timeout))
2844 return -EBUSY;
2845 }
2846}
2847
2848/**
2849 * sata_phy_resume - resume SATA phy
2850 * @ap: ATA port to resume SATA phy for
2851 * @params: timing parameters { interval, duratinon, timeout } in msec
2852 *
2853 * Resume SATA phy of @ap and debounce it.
2854 *
2855 * LOCKING:
2856 * Kernel thread context (may sleep)
2857 *
2858 * RETURNS:
2859 * 0 on success, -errno on failure.
2860 */
2861int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
2862{
2863 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002864 int rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002865
Tejun Heo81952c52006-05-15 20:57:47 +09002866 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2867 return rc;
2868
Tejun Heo852ee162006-04-01 01:38:18 +09002869 scontrol = (scontrol & 0x0f0) | 0x300;
Tejun Heo81952c52006-05-15 20:57:47 +09002870
2871 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2872 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002873
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002874 /* Some PHYs react badly if SStatus is pounded immediately
2875 * after resuming. Delay 200ms before debouncing.
2876 */
2877 msleep(200);
Tejun Heo7a7921e2006-02-02 18:20:00 +09002878
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002879 return sata_phy_debounce(ap, params);
Tejun Heo7a7921e2006-02-02 18:20:00 +09002880}
2881
Tejun Heof5914a42006-05-31 18:27:48 +09002882static void ata_wait_spinup(struct ata_port *ap)
2883{
2884 struct ata_eh_context *ehc = &ap->eh_context;
2885 unsigned long end, secs;
2886 int rc;
2887
2888 /* first, debounce phy if SATA */
2889 if (ap->cbl == ATA_CBL_SATA) {
Tejun Heoe9c83912006-07-03 16:07:26 +09002890 rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
Tejun Heof5914a42006-05-31 18:27:48 +09002891
2892 /* if debounced successfully and offline, no need to wait */
2893 if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
2894 return;
2895 }
2896
2897 /* okay, let's give the drive time to spin up */
2898 end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
2899 secs = ((end - jiffies) + HZ - 1) / HZ;
2900
2901 if (time_after(jiffies, end))
2902 return;
2903
2904 if (secs > 5)
2905 ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
2906 "(%lu secs)\n", secs);
2907
2908 schedule_timeout_uninterruptible(end - jiffies);
2909}
2910
2911/**
2912 * ata_std_prereset - prepare for reset
2913 * @ap: ATA port to be reset
2914 *
2915 * @ap is about to be reset. Initialize it.
2916 *
2917 * LOCKING:
2918 * Kernel thread context (may sleep)
2919 *
2920 * RETURNS:
2921 * 0 on success, -errno otherwise.
2922 */
2923int ata_std_prereset(struct ata_port *ap)
2924{
2925 struct ata_eh_context *ehc = &ap->eh_context;
Tejun Heoe9c83912006-07-03 16:07:26 +09002926 const unsigned long *timing = sata_ehc_deb_timing(ehc);
Tejun Heof5914a42006-05-31 18:27:48 +09002927 int rc;
2928
Tejun Heo28324302006-07-03 16:07:26 +09002929 /* handle link resume & hotplug spinup */
2930 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
2931 (ap->flags & ATA_FLAG_HRST_TO_RESUME))
2932 ehc->i.action |= ATA_EH_HARDRESET;
2933
2934 if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
2935 (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
2936 ata_wait_spinup(ap);
Tejun Heof5914a42006-05-31 18:27:48 +09002937
2938 /* if we're about to do hardreset, nothing more to do */
2939 if (ehc->i.action & ATA_EH_HARDRESET)
2940 return 0;
2941
2942 /* if SATA, resume phy */
2943 if (ap->cbl == ATA_CBL_SATA) {
Tejun Heof5914a42006-05-31 18:27:48 +09002944 rc = sata_phy_resume(ap, timing);
2945 if (rc && rc != -EOPNOTSUPP) {
2946 /* phy resume failed */
2947 ata_port_printk(ap, KERN_WARNING, "failed to resume "
2948 "link for reset (errno=%d)\n", rc);
2949 return rc;
2950 }
2951 }
2952
2953 /* Wait for !BSY if the controller can wait for the first D2H
2954 * Reg FIS and we don't know that no device is attached.
2955 */
2956 if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
2957 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2958
2959 return 0;
2960}
2961
Tejun Heoc2bd5802006-01-24 17:05:22 +09002962/**
2963 * ata_std_softreset - reset host port via ATA SRST
2964 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002965 * @classes: resulting classes of attached devices
2966 *
Tejun Heo52783c52006-05-31 18:28:22 +09002967 * Reset host port using ATA SRST.
Tejun Heoc2bd5802006-01-24 17:05:22 +09002968 *
2969 * LOCKING:
2970 * Kernel thread context (may sleep)
2971 *
2972 * RETURNS:
2973 * 0 on success, -errno otherwise.
2974 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002975int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002976{
2977 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2978 unsigned int devmask = 0, err_mask;
2979 u8 err;
2980
2981 DPRINTK("ENTER\n");
2982
Tejun Heo81952c52006-05-15 20:57:47 +09002983 if (ata_port_offline(ap)) {
Tejun Heo3a397462006-02-10 23:58:48 +09002984 classes[0] = ATA_DEV_NONE;
2985 goto out;
2986 }
2987
Tejun Heoc2bd5802006-01-24 17:05:22 +09002988 /* determine if device 0/1 are present */
2989 if (ata_devchk(ap, 0))
2990 devmask |= (1 << 0);
2991 if (slave_possible && ata_devchk(ap, 1))
2992 devmask |= (1 << 1);
2993
Tejun Heoc2bd5802006-01-24 17:05:22 +09002994 /* select device 0 again */
2995 ap->ops->dev_select(ap, 0);
2996
2997 /* issue bus reset */
2998 DPRINTK("about to softreset, devmask=%x\n", devmask);
2999 err_mask = ata_bus_softreset(ap, devmask);
3000 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003001 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
3002 err_mask);
Tejun Heoc2bd5802006-01-24 17:05:22 +09003003 return -EIO;
3004 }
3005
3006 /* determine by signature whether we have ATA or ATAPI devices */
3007 classes[0] = ata_dev_try_classify(ap, 0, &err);
3008 if (slave_possible && err != 0x81)
3009 classes[1] = ata_dev_try_classify(ap, 1, &err);
3010
Tejun Heo3a397462006-02-10 23:58:48 +09003011 out:
Tejun Heoc2bd5802006-01-24 17:05:22 +09003012 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3013 return 0;
3014}
3015
3016/**
Tejun Heob6103f62006-11-01 17:59:53 +09003017 * sata_port_hardreset - reset port via SATA phy reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09003018 * @ap: port to reset
Tejun Heob6103f62006-11-01 17:59:53 +09003019 * @timing: timing parameters { interval, duratinon, timeout } in msec
Tejun Heoc2bd5802006-01-24 17:05:22 +09003020 *
3021 * SATA phy-reset host port using DET bits of SControl register.
Tejun Heoc2bd5802006-01-24 17:05:22 +09003022 *
3023 * LOCKING:
3024 * Kernel thread context (may sleep)
3025 *
3026 * RETURNS:
3027 * 0 on success, -errno otherwise.
3028 */
Tejun Heob6103f62006-11-01 17:59:53 +09003029int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
Tejun Heoc2bd5802006-01-24 17:05:22 +09003030{
Tejun Heo852ee162006-04-01 01:38:18 +09003031 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09003032 int rc;
Tejun Heo852ee162006-04-01 01:38:18 +09003033
Tejun Heoc2bd5802006-01-24 17:05:22 +09003034 DPRINTK("ENTER\n");
3035
Tejun Heo3c567b72006-05-15 20:57:23 +09003036 if (sata_set_spd_needed(ap)) {
Tejun Heo1c3fae42006-04-02 20:53:28 +09003037 /* SATA spec says nothing about how to reconfigure
3038 * spd. To be on the safe side, turn off phy during
3039 * reconfiguration. This works for at least ICH7 AHCI
3040 * and Sil3124.
3041 */
Tejun Heo81952c52006-05-15 20:57:47 +09003042 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09003043 goto out;
Tejun Heo81952c52006-05-15 20:57:47 +09003044
Martin Hicksa34b6fc2006-07-05 15:06:13 -04003045 scontrol = (scontrol & 0x0f0) | 0x304;
Tejun Heo81952c52006-05-15 20:57:47 +09003046
3047 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09003048 goto out;
Tejun Heo1c3fae42006-04-02 20:53:28 +09003049
Tejun Heo3c567b72006-05-15 20:57:23 +09003050 sata_set_spd(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09003051 }
3052
3053 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09003054 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09003055 goto out;
Tejun Heo81952c52006-05-15 20:57:47 +09003056
Tejun Heo852ee162006-04-01 01:38:18 +09003057 scontrol = (scontrol & 0x0f0) | 0x301;
Tejun Heo81952c52006-05-15 20:57:47 +09003058
3059 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09003060 goto out;
Tejun Heoc2bd5802006-01-24 17:05:22 +09003061
Tejun Heo1c3fae42006-04-02 20:53:28 +09003062 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
Tejun Heoc2bd5802006-01-24 17:05:22 +09003063 * 10.4.2 says at least 1 ms.
3064 */
3065 msleep(1);
3066
Tejun Heo1c3fae42006-04-02 20:53:28 +09003067 /* bring phy back */
Tejun Heob6103f62006-11-01 17:59:53 +09003068 rc = sata_phy_resume(ap, timing);
3069 out:
3070 DPRINTK("EXIT, rc=%d\n", rc);
3071 return rc;
3072}
3073
3074/**
3075 * sata_std_hardreset - reset host port via SATA phy reset
3076 * @ap: port to reset
3077 * @class: resulting class of attached device
3078 *
3079 * SATA phy-reset host port using DET bits of SControl register,
3080 * wait for !BSY and classify the attached device.
3081 *
3082 * LOCKING:
3083 * Kernel thread context (may sleep)
3084 *
3085 * RETURNS:
3086 * 0 on success, -errno otherwise.
3087 */
3088int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
3089{
3090 const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
3091 int rc;
3092
3093 DPRINTK("ENTER\n");
3094
3095 /* do hardreset */
3096 rc = sata_port_hardreset(ap, timing);
3097 if (rc) {
3098 ata_port_printk(ap, KERN_ERR,
3099 "COMRESET failed (errno=%d)\n", rc);
3100 return rc;
3101 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09003102
Tejun Heoc2bd5802006-01-24 17:05:22 +09003103 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09003104 if (ata_port_offline(ap)) {
Tejun Heoc2bd5802006-01-24 17:05:22 +09003105 *class = ATA_DEV_NONE;
3106 DPRINTK("EXIT, link offline\n");
3107 return 0;
3108 }
3109
3110 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003111 ata_port_printk(ap, KERN_ERR,
3112 "COMRESET failed (device not ready)\n");
Tejun Heoc2bd5802006-01-24 17:05:22 +09003113 return -EIO;
3114 }
3115
Tejun Heo3a397462006-02-10 23:58:48 +09003116 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3117
Tejun Heoc2bd5802006-01-24 17:05:22 +09003118 *class = ata_dev_try_classify(ap, 0, NULL);
3119
3120 DPRINTK("EXIT, class=%u\n", *class);
3121 return 0;
3122}
3123
3124/**
3125 * ata_std_postreset - standard postreset callback
3126 * @ap: the target ata_port
3127 * @classes: classes of attached devices
3128 *
3129 * This function is invoked after a successful reset. Note that
3130 * the device might have been reset more than once using
3131 * different reset methods before postreset is invoked.
Tejun Heoc2bd5802006-01-24 17:05:22 +09003132 *
Tejun Heoc2bd5802006-01-24 17:05:22 +09003133 * LOCKING:
3134 * Kernel thread context (may sleep)
3135 */
3136void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
3137{
Tejun Heodc2b3512006-05-15 20:58:00 +09003138 u32 serror;
3139
Tejun Heoc2bd5802006-01-24 17:05:22 +09003140 DPRINTK("ENTER\n");
3141
Tejun Heoc2bd5802006-01-24 17:05:22 +09003142 /* print link status */
Tejun Heo81952c52006-05-15 20:57:47 +09003143 sata_print_link_status(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09003144
Tejun Heodc2b3512006-05-15 20:58:00 +09003145 /* clear SError */
3146 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
3147 sata_scr_write(ap, SCR_ERROR, serror);
3148
Tejun Heo3a397462006-02-10 23:58:48 +09003149 /* re-enable interrupts */
Tejun Heoe3180492006-05-15 20:58:09 +09003150 if (!ap->ops->error_handler) {
3151 /* FIXME: hack. create a hook instead */
3152 if (ap->ioaddr.ctl_addr)
3153 ata_irq_on(ap);
3154 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09003155
3156 /* is double-select really necessary? */
3157 if (classes[0] != ATA_DEV_NONE)
3158 ap->ops->dev_select(ap, 1);
3159 if (classes[1] != ATA_DEV_NONE)
3160 ap->ops->dev_select(ap, 0);
3161
Tejun Heo3a397462006-02-10 23:58:48 +09003162 /* bail out if no device is present */
3163 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3164 DPRINTK("EXIT, no device\n");
3165 return;
3166 }
3167
3168 /* set up device control */
3169 if (ap->ioaddr.ctl_addr) {
3170 if (ap->flags & ATA_FLAG_MMIO)
3171 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
3172 else
3173 outb(ap->ctl, ap->ioaddr.ctl_addr);
3174 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09003175
3176 DPRINTK("EXIT\n");
3177}
3178
Tejun Heoa62c0fc2006-01-24 17:05:22 +09003179/**
Tejun Heo623a3122006-03-05 17:55:58 +09003180 * ata_dev_same_device - Determine whether new ID matches configured device
Tejun Heo623a3122006-03-05 17:55:58 +09003181 * @dev: device to compare against
3182 * @new_class: class of the new device
3183 * @new_id: IDENTIFY page of the new device
3184 *
3185 * Compare @new_class and @new_id against @dev and determine
3186 * whether @dev is the device indicated by @new_class and
3187 * @new_id.
3188 *
3189 * LOCKING:
3190 * None.
3191 *
3192 * RETURNS:
3193 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3194 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003195static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3196 const u16 *new_id)
Tejun Heo623a3122006-03-05 17:55:58 +09003197{
3198 const u16 *old_id = dev->id;
3199 unsigned char model[2][41], serial[2][21];
3200 u64 new_n_sectors;
3201
3202 if (dev->class != new_class) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003203 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3204 dev->class, new_class);
Tejun Heo623a3122006-03-05 17:55:58 +09003205 return 0;
3206 }
3207
3208 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
3209 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
3210 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
3211 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
3212 new_n_sectors = ata_id_n_sectors(new_id);
3213
3214 if (strcmp(model[0], model[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003215 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3216 "'%s' != '%s'\n", model[0], model[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09003217 return 0;
3218 }
3219
3220 if (strcmp(serial[0], serial[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003221 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3222 "'%s' != '%s'\n", serial[0], serial[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09003223 return 0;
3224 }
3225
3226 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003227 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3228 "%llu != %llu\n",
3229 (unsigned long long)dev->n_sectors,
3230 (unsigned long long)new_n_sectors);
Tejun Heo623a3122006-03-05 17:55:58 +09003231 return 0;
3232 }
3233
3234 return 1;
3235}
3236
3237/**
3238 * ata_dev_revalidate - Revalidate ATA device
Tejun Heo623a3122006-03-05 17:55:58 +09003239 * @dev: device to revalidate
Tejun Heobff04642006-11-10 18:08:10 +09003240 * @readid_flags: read ID flags
Tejun Heo623a3122006-03-05 17:55:58 +09003241 *
3242 * Re-read IDENTIFY page and make sure @dev is still attached to
3243 * the port.
3244 *
3245 * LOCKING:
3246 * Kernel thread context (may sleep)
3247 *
3248 * RETURNS:
3249 * 0 on success, negative errno otherwise
3250 */
Tejun Heobff04642006-11-10 18:08:10 +09003251int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
Tejun Heo623a3122006-03-05 17:55:58 +09003252{
Tejun Heo5eb45c02006-04-02 18:51:52 +09003253 unsigned int class = dev->class;
Tejun Heof15a1da2006-05-15 20:57:56 +09003254 u16 *id = (void *)dev->ap->sector_buf;
Tejun Heo623a3122006-03-05 17:55:58 +09003255 int rc;
3256
Tejun Heo5eb45c02006-04-02 18:51:52 +09003257 if (!ata_dev_enabled(dev)) {
3258 rc = -ENODEV;
3259 goto fail;
3260 }
Tejun Heo623a3122006-03-05 17:55:58 +09003261
Tejun Heofe635c72006-05-15 20:57:35 +09003262 /* read ID data */
Tejun Heobff04642006-11-10 18:08:10 +09003263 rc = ata_dev_read_id(dev, &class, readid_flags, id);
Tejun Heo623a3122006-03-05 17:55:58 +09003264 if (rc)
3265 goto fail;
3266
3267 /* is the device still there? */
Tejun Heo3373efd2006-05-15 20:57:53 +09003268 if (!ata_dev_same_device(dev, class, id)) {
Tejun Heo623a3122006-03-05 17:55:58 +09003269 rc = -ENODEV;
3270 goto fail;
3271 }
3272
Tejun Heofe635c72006-05-15 20:57:35 +09003273 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo623a3122006-03-05 17:55:58 +09003274
3275 /* configure device according to the new ID */
Tejun Heoefdaedc2006-11-01 18:38:52 +09003276 rc = ata_dev_configure(dev);
Tejun Heo5eb45c02006-04-02 18:51:52 +09003277 if (rc == 0)
3278 return 0;
Tejun Heo623a3122006-03-05 17:55:58 +09003279
3280 fail:
Tejun Heof15a1da2006-05-15 20:57:56 +09003281 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
Tejun Heo623a3122006-03-05 17:55:58 +09003282 return rc;
3283}
3284
Alan Cox6919a0a2006-10-27 19:08:46 -07003285struct ata_blacklist_entry {
3286 const char *model_num;
3287 const char *model_rev;
3288 unsigned long horkage;
3289};
3290
3291static const struct ata_blacklist_entry ata_device_blacklist [] = {
3292 /* Devices with DMA related problems under Linux */
3293 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3294 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3295 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3296 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3297 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3298 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3299 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3300 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3301 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3302 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3303 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3304 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3305 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3306 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3307 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3308 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3309 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3310 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3311 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3312 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3313 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3314 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3315 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3316 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3317 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3318 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3319 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3320 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3321 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3322 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
3323
3324 /* Devices we expect to fail diagnostics */
3325
3326 /* Devices where NCQ should be avoided */
3327 /* NCQ is slow */
3328 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3329
3330 /* Devices with NCQ limits */
3331
3332 /* End Marker */
3333 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334};
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05003335
Alan Coxf4b15fe2006-03-22 15:54:04 +00003336static int ata_strim(char *s, size_t len)
3337{
3338 len = strnlen(s, len);
3339
3340 /* ATAPI specifies that empty space is blank-filled; remove blanks */
3341 while ((len > 0) && (s[len - 1] == ' ')) {
3342 len--;
3343 s[len] = 0;
3344 }
3345 return len;
3346}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003347
Alan Cox6919a0a2006-10-27 19:08:46 -07003348unsigned long ata_device_blacklisted(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349{
Alan Coxf4b15fe2006-03-22 15:54:04 +00003350 unsigned char model_num[40];
3351 unsigned char model_rev[16];
3352 unsigned int nlen, rlen;
Alan Cox6919a0a2006-10-27 19:08:46 -07003353 const struct ata_blacklist_entry *ad = ata_device_blacklist;
Albert Lee3a778272006-06-22 13:00:25 +08003354
Alan Coxf4b15fe2006-03-22 15:54:04 +00003355 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
3356 sizeof(model_num));
3357 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
3358 sizeof(model_rev));
3359 nlen = ata_strim(model_num, sizeof(model_num));
3360 rlen = ata_strim(model_rev, sizeof(model_rev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003361
Alan Cox6919a0a2006-10-27 19:08:46 -07003362 while (ad->model_num) {
3363 if (!strncmp(ad->model_num, model_num, nlen)) {
3364 if (ad->model_rev == NULL)
3365 return ad->horkage;
3366 if (!strncmp(ad->model_rev, model_rev, rlen))
3367 return ad->horkage;
Alan Coxf4b15fe2006-03-22 15:54:04 +00003368 }
Alan Cox6919a0a2006-10-27 19:08:46 -07003369 ad++;
Alan Coxf4b15fe2006-03-22 15:54:04 +00003370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003371 return 0;
3372}
3373
Alan Cox6919a0a2006-10-27 19:08:46 -07003374static int ata_dma_blacklisted(const struct ata_device *dev)
3375{
3376 /* We don't support polling DMA.
3377 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3378 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3379 */
3380 if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
3381 (dev->flags & ATA_DFLAG_CDB_INTR))
3382 return 1;
3383 return (ata_device_blacklisted(dev) & ATA_HORKAGE_NODMA) ? 1 : 0;
3384}
3385
Tejun Heoa6d5a512006-03-06 04:31:57 +09003386/**
3387 * ata_dev_xfermask - Compute supported xfermask of the given device
Tejun Heoa6d5a512006-03-06 04:31:57 +09003388 * @dev: Device to compute xfermask for
3389 *
Tejun Heoacf356b2006-03-24 14:07:50 +09003390 * Compute supported xfermask of @dev and store it in
3391 * dev->*_mask. This function is responsible for applying all
3392 * known limits including host controller limits, device
3393 * blacklist, etc...
Tejun Heoa6d5a512006-03-06 04:31:57 +09003394 *
3395 * LOCKING:
3396 * None.
Tejun Heoa6d5a512006-03-06 04:31:57 +09003397 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003398static void ata_dev_xfermask(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399{
Tejun Heo3373efd2006-05-15 20:57:53 +09003400 struct ata_port *ap = dev->ap;
Jeff Garzikcca39742006-08-24 03:19:22 -04003401 struct ata_host *host = ap->host;
Tejun Heoa6d5a512006-03-06 04:31:57 +09003402 unsigned long xfer_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003403
Tejun Heo37deecb2006-08-10 16:59:07 +09003404 /* controller modes available */
Tejun Heo565083e2006-04-02 17:54:47 +09003405 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3406 ap->mwdma_mask, ap->udma_mask);
3407
3408 /* Apply cable rule here. Don't apply it early because when
3409 * we handle hot plug the cable type can itself change.
3410 */
3411 if (ap->cbl == ATA_CBL_PATA40)
3412 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
Alan Coxfc085152006-10-10 14:28:11 -07003413 /* Apply drive side cable rule. Unknown or 80 pin cables reported
3414 * host side are checked drive side as well. Cases where we know a
3415 * 40wire cable is used safely for 80 are not checked here.
3416 */
3417 if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
3418 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3419
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420
Tejun Heo37deecb2006-08-10 16:59:07 +09003421 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
3422 dev->mwdma_mask, dev->udma_mask);
3423 xfer_mask &= ata_id_xfermask(dev->id);
Tejun Heo565083e2006-04-02 17:54:47 +09003424
Alan Coxb352e572006-08-10 18:52:12 +01003425 /*
3426 * CFA Advanced TrueIDE timings are not allowed on a shared
3427 * cable
3428 */
3429 if (ata_dev_pair(dev)) {
3430 /* No PIO5 or PIO6 */
3431 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
3432 /* No MWDMA3 or MWDMA 4 */
3433 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
3434 }
3435
Tejun Heo37deecb2006-08-10 16:59:07 +09003436 if (ata_dma_blacklisted(dev)) {
3437 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
Tejun Heof15a1da2006-05-15 20:57:56 +09003438 ata_dev_printk(dev, KERN_WARNING,
3439 "device is on DMA blacklist, disabling DMA\n");
Tejun Heo37deecb2006-08-10 16:59:07 +09003440 }
Tejun Heoa6d5a512006-03-06 04:31:57 +09003441
Jeff Garzikcca39742006-08-24 03:19:22 -04003442 if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
Tejun Heo37deecb2006-08-10 16:59:07 +09003443 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3444 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
3445 "other device, disabling DMA\n");
Alan Cox5444a6f2006-03-27 18:58:20 +01003446 }
Tejun Heo565083e2006-04-02 17:54:47 +09003447
Alan Cox5444a6f2006-03-27 18:58:20 +01003448 if (ap->ops->mode_filter)
3449 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
3450
Tejun Heo565083e2006-04-02 17:54:47 +09003451 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3452 &dev->mwdma_mask, &dev->udma_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003453}
3454
Linus Torvalds1da177e2005-04-16 15:20:36 -07003455/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07003456 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457 * @dev: Device to which command will be sent
3458 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003459 * Issue SET FEATURES - XFER MODE command to device @dev
3460 * on port @ap.
3461 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003462 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003463 * PCI/etc. bus probe sem.
Tejun Heo83206a22006-03-24 15:25:31 +09003464 *
3465 * RETURNS:
3466 * 0 on success, AC_ERR_* mask otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003467 */
3468
Tejun Heo3373efd2006-05-15 20:57:53 +09003469static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003470{
Tejun Heoa0123702005-12-13 14:49:31 +09003471 struct ata_taskfile tf;
Tejun Heo83206a22006-03-24 15:25:31 +09003472 unsigned int err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473
3474 /* set up set-features taskfile */
3475 DPRINTK("set features - xfer mode\n");
3476
Tejun Heo3373efd2006-05-15 20:57:53 +09003477 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003478 tf.command = ATA_CMD_SET_FEATURES;
3479 tf.feature = SETFEATURES_XFER;
3480 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3481 tf.protocol = ATA_PROT_NODATA;
3482 tf.nsect = dev->xfer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003483
Tejun Heo3373efd2006-05-15 20:57:53 +09003484 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003485
Tejun Heo83206a22006-03-24 15:25:31 +09003486 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3487 return err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003488}
3489
3490/**
Albert Lee8bf62ece2005-05-12 15:29:42 -04003491 * ata_dev_init_params - Issue INIT DEV PARAMS command
Albert Lee8bf62ece2005-05-12 15:29:42 -04003492 * @dev: Device to which command will be sent
Randy Dunlape2a7f772006-05-18 10:50:18 -07003493 * @heads: Number of heads (taskfile parameter)
3494 * @sectors: Number of sectors (taskfile parameter)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003495 *
3496 * LOCKING:
Tejun Heo6aff8f12006-02-15 18:24:09 +09003497 * Kernel thread context (may sleep)
3498 *
3499 * RETURNS:
3500 * 0 on success, AC_ERR_* mask otherwise.
Albert Lee8bf62ece2005-05-12 15:29:42 -04003501 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003502static unsigned int ata_dev_init_params(struct ata_device *dev,
3503 u16 heads, u16 sectors)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003504{
Tejun Heoa0123702005-12-13 14:49:31 +09003505 struct ata_taskfile tf;
Tejun Heo6aff8f12006-02-15 18:24:09 +09003506 unsigned int err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003507
3508 /* Number of sectors per track 1-255. Number of heads 1-16 */
3509 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
Albert Lee00b6f5e2006-03-27 16:39:18 +08003510 return AC_ERR_INVALID;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003511
3512 /* set up init dev params taskfile */
3513 DPRINTK("init dev params \n");
3514
Tejun Heo3373efd2006-05-15 20:57:53 +09003515 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003516 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3517 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3518 tf.protocol = ATA_PROT_NODATA;
3519 tf.nsect = sectors;
3520 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
Albert Lee8bf62ece2005-05-12 15:29:42 -04003521
Tejun Heo3373efd2006-05-15 20:57:53 +09003522 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Albert Lee8bf62ece2005-05-12 15:29:42 -04003523
Tejun Heo6aff8f12006-02-15 18:24:09 +09003524 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3525 return err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003526}
3527
3528/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003529 * ata_sg_clean - Unmap DMA memory associated with command
3530 * @qc: Command containing DMA memory to be released
3531 *
3532 * Unmap all mapped DMA memory associated with this command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003533 *
3534 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003535 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003536 */
Tejun Heo70e6ad02006-11-14 22:47:10 +09003537void ata_sg_clean(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003538{
3539 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003540 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003541 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003542 void *pad_buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003543
Tejun Heoa46314742006-02-11 19:11:13 +09003544 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3545 WARN_ON(sg == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003546
3547 if (qc->flags & ATA_QCFLAG_SINGLE)
Jeff Garzikf1318832006-02-20 16:55:56 -05003548 WARN_ON(qc->n_elem > 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003549
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05003550 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003551
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003552 /* if we padded the buffer out to 32-bit bound, and data
3553 * xfer direction is from-device, we must copy from the
3554 * pad buffer back into the supplied buffer
3555 */
3556 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3557 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3558
3559 if (qc->flags & ATA_QCFLAG_SG) {
Jeff Garzike1410f22005-11-14 14:06:26 -05003560 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003561 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003562 /* restore last sg */
3563 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3564 if (pad_buf) {
3565 struct scatterlist *psg = &qc->pad_sgent;
3566 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3567 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003568 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003569 }
3570 } else {
Tejun Heo2e242fa2006-02-20 23:48:38 +09003571 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003572 dma_unmap_single(ap->dev,
Jeff Garzike1410f22005-11-14 14:06:26 -05003573 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3574 dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003575 /* restore sg */
3576 sg->length += qc->pad_len;
3577 if (pad_buf)
3578 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3579 pad_buf, qc->pad_len);
3580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003581
3582 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003583 qc->__sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003584}
3585
3586/**
3587 * ata_fill_sg - Fill PCI IDE PRD table
3588 * @qc: Metadata associated with taskfile to be transferred
3589 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003590 * Fill PCI IDE PRD (scatter-gather) table with segments
3591 * associated with the current disk command.
3592 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003593 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003594 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003595 *
3596 */
3597static void ata_fill_sg(struct ata_queued_cmd *qc)
3598{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003599 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003600 struct scatterlist *sg;
3601 unsigned int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003602
Tejun Heoa46314742006-02-11 19:11:13 +09003603 WARN_ON(qc->__sg == NULL);
Jeff Garzikf1318832006-02-20 16:55:56 -05003604 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003605
3606 idx = 0;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003607 ata_for_each_sg(sg, qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003608 u32 addr, offset;
3609 u32 sg_len, len;
3610
3611 /* determine if physical DMA addr spans 64K boundary.
3612 * Note h/w doesn't support 64-bit, so we unconditionally
3613 * truncate dma_addr_t to u32.
3614 */
3615 addr = (u32) sg_dma_address(sg);
3616 sg_len = sg_dma_len(sg);
3617
3618 while (sg_len) {
3619 offset = addr & 0xffff;
3620 len = sg_len;
3621 if ((offset + sg_len) > 0x10000)
3622 len = 0x10000 - offset;
3623
3624 ap->prd[idx].addr = cpu_to_le32(addr);
3625 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3626 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3627
3628 idx++;
3629 sg_len -= len;
3630 addr += len;
3631 }
3632 }
3633
3634 if (idx)
3635 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3636}
3637/**
3638 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3639 * @qc: Metadata associated with taskfile to check
3640 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003641 * Allow low-level driver to filter ATA PACKET commands, returning
3642 * a status indicating whether or not it is OK to use DMA for the
3643 * supplied PACKET command.
3644 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003645 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003646 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003647 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003648 * RETURNS: 0 when ATAPI DMA can be used
3649 * nonzero otherwise
3650 */
3651int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3652{
3653 struct ata_port *ap = qc->ap;
3654 int rc = 0; /* Assume ATAPI DMA is OK by default */
3655
3656 if (ap->ops->check_atapi_dma)
3657 rc = ap->ops->check_atapi_dma(qc);
3658
3659 return rc;
3660}
3661/**
3662 * ata_qc_prep - Prepare taskfile for submission
3663 * @qc: Metadata associated with taskfile to be prepared
3664 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003665 * Prepare ATA taskfile for submission.
3666 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003667 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003668 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669 */
3670void ata_qc_prep(struct ata_queued_cmd *qc)
3671{
3672 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3673 return;
3674
3675 ata_fill_sg(qc);
3676}
3677
Brian Kinge46834c2006-03-17 17:04:03 -06003678void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3679
Jeff Garzik0cba6322005-05-30 19:49:12 -04003680/**
3681 * ata_sg_init_one - Associate command with memory buffer
3682 * @qc: Command to be associated
3683 * @buf: Memory buffer
3684 * @buflen: Length of memory buffer, in bytes.
3685 *
3686 * Initialize the data-related elements of queued_cmd @qc
3687 * to point to a single memory buffer, @buf of byte length @buflen.
3688 *
3689 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003690 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003691 */
3692
Linus Torvalds1da177e2005-04-16 15:20:36 -07003693void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3694{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003695 qc->flags |= ATA_QCFLAG_SINGLE;
3696
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003697 qc->__sg = &qc->sgent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003698 qc->n_elem = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003699 qc->orig_n_elem = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003700 qc->buf_virt = buf;
Brian King233277c2006-06-07 11:25:31 -05003701 qc->nbytes = buflen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003702
Tejun Heo61c05962006-11-14 22:35:43 +09003703 sg_init_one(&qc->sgent, buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003704}
3705
Jeff Garzik0cba6322005-05-30 19:49:12 -04003706/**
3707 * ata_sg_init - Associate command with scatter-gather table.
3708 * @qc: Command to be associated
3709 * @sg: Scatter-gather table.
3710 * @n_elem: Number of elements in s/g table.
3711 *
3712 * Initialize the data-related elements of queued_cmd @qc
3713 * to point to a scatter-gather table @sg, containing @n_elem
3714 * elements.
3715 *
3716 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003717 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003718 */
3719
Linus Torvalds1da177e2005-04-16 15:20:36 -07003720void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3721 unsigned int n_elem)
3722{
3723 qc->flags |= ATA_QCFLAG_SG;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003724 qc->__sg = sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003725 qc->n_elem = n_elem;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003726 qc->orig_n_elem = n_elem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003727}
3728
3729/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003730 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3731 * @qc: Command with memory buffer to be mapped.
3732 *
3733 * DMA-map the memory buffer associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003734 *
3735 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003736 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003737 *
3738 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003739 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003740 */
3741
3742static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3743{
3744 struct ata_port *ap = qc->ap;
3745 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003746 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747 dma_addr_t dma_address;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003748 int trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003749
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003750 /* we must lengthen transfers to end on a 32-bit boundary */
3751 qc->pad_len = sg->length & 3;
3752 if (qc->pad_len) {
3753 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3754 struct scatterlist *psg = &qc->pad_sgent;
3755
Tejun Heoa46314742006-02-11 19:11:13 +09003756 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003757
3758 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3759
3760 if (qc->tf.flags & ATA_TFLAG_WRITE)
3761 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3762 qc->pad_len);
3763
3764 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3765 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3766 /* trim sg */
3767 sg->length -= qc->pad_len;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003768 if (sg->length == 0)
3769 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003770
3771 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3772 sg->length, qc->pad_len);
3773 }
3774
Tejun Heo2e242fa2006-02-20 23:48:38 +09003775 if (trim_sg) {
3776 qc->n_elem--;
Jeff Garzike1410f22005-11-14 14:06:26 -05003777 goto skip_map;
3778 }
3779
Brian King2f1f6102006-03-23 17:30:15 -06003780 dma_address = dma_map_single(ap->dev, qc->buf_virt,
Albert Lee32529e02005-05-26 03:49:42 -04003781 sg->length, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003782 if (dma_mapping_error(dma_address)) {
3783 /* restore sg */
3784 sg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003785 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003786 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003787
3788 sg_dma_address(sg) = dma_address;
Albert Lee32529e02005-05-26 03:49:42 -04003789 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003790
Tejun Heo2e242fa2006-02-20 23:48:38 +09003791skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003792 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3793 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3794
3795 return 0;
3796}
3797
3798/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003799 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3800 * @qc: Command with scatter-gather table to be mapped.
3801 *
3802 * DMA-map the scatter-gather table associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003803 *
3804 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003805 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806 *
3807 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003808 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809 *
3810 */
3811
3812static int ata_sg_setup(struct ata_queued_cmd *qc)
3813{
3814 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003815 struct scatterlist *sg = qc->__sg;
3816 struct scatterlist *lsg = &sg[qc->n_elem - 1];
Jeff Garzike1410f22005-11-14 14:06:26 -05003817 int n_elem, pre_n_elem, dir, trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818
3819 VPRINTK("ENTER, ata%u\n", ap->id);
Tejun Heoa46314742006-02-11 19:11:13 +09003820 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003821
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003822 /* we must lengthen transfers to end on a 32-bit boundary */
3823 qc->pad_len = lsg->length & 3;
3824 if (qc->pad_len) {
3825 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3826 struct scatterlist *psg = &qc->pad_sgent;
3827 unsigned int offset;
3828
Tejun Heoa46314742006-02-11 19:11:13 +09003829 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003830
3831 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3832
3833 /*
3834 * psg->page/offset are used to copy to-be-written
3835 * data in this function or read data in ata_sg_clean.
3836 */
3837 offset = lsg->offset + lsg->length - qc->pad_len;
3838 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3839 psg->offset = offset_in_page(offset);
3840
3841 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3842 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3843 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003844 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003845 }
3846
3847 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3848 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3849 /* trim last sg */
3850 lsg->length -= qc->pad_len;
Jeff Garzike1410f22005-11-14 14:06:26 -05003851 if (lsg->length == 0)
3852 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003853
3854 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3855 qc->n_elem - 1, lsg->length, qc->pad_len);
3856 }
3857
Jeff Garzike1410f22005-11-14 14:06:26 -05003858 pre_n_elem = qc->n_elem;
3859 if (trim_sg && pre_n_elem)
3860 pre_n_elem--;
3861
3862 if (!pre_n_elem) {
3863 n_elem = 0;
3864 goto skip_map;
3865 }
3866
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867 dir = qc->dma_dir;
Brian King2f1f6102006-03-23 17:30:15 -06003868 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003869 if (n_elem < 1) {
3870 /* restore last sg */
3871 lsg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003872 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003873 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003874
3875 DPRINTK("%d sg elements mapped\n", n_elem);
3876
Jeff Garzike1410f22005-11-14 14:06:26 -05003877skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003878 qc->n_elem = n_elem;
3879
3880 return 0;
3881}
3882
3883/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003884 * swap_buf_le16 - swap halves of 16-bit words in place
Edward Falk0baab862005-06-02 18:17:13 -04003885 * @buf: Buffer to swap
3886 * @buf_words: Number of 16-bit words in buffer.
3887 *
3888 * Swap halves of 16-bit words if needed to convert from
3889 * little-endian byte order to native cpu byte order, or
3890 * vice-versa.
3891 *
3892 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003893 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04003894 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003895void swap_buf_le16(u16 *buf, unsigned int buf_words)
3896{
3897#ifdef __BIG_ENDIAN
3898 unsigned int i;
3899
3900 for (i = 0; i < buf_words; i++)
3901 buf[i] = le16_to_cpu(buf[i]);
3902#endif /* __BIG_ENDIAN */
3903}
3904
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003905/**
3906 * ata_mmio_data_xfer - Transfer data by MMIO
Jeff Garzikbf717b112006-06-13 20:27:03 -04003907 * @adev: device for this I/O
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003908 * @buf: data buffer
3909 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003910 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003911 *
3912 * Transfer data from/to the device data register by MMIO.
3913 *
3914 * LOCKING:
3915 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003916 */
3917
Tejun Heo88574552006-06-25 20:00:35 +09003918void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003919 unsigned int buflen, int write_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003920{
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003921 struct ata_port *ap = adev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003922 unsigned int i;
3923 unsigned int words = buflen >> 1;
3924 u16 *buf16 = (u16 *) buf;
3925 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3926
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003927 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003928 if (write_data) {
3929 for (i = 0; i < words; i++)
3930 writew(le16_to_cpu(buf16[i]), mmio);
3931 } else {
3932 for (i = 0; i < words; i++)
3933 buf16[i] = cpu_to_le16(readw(mmio));
3934 }
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003935
3936 /* Transfer trailing 1 byte, if any. */
3937 if (unlikely(buflen & 0x01)) {
3938 u16 align_buf[1] = { 0 };
3939 unsigned char *trailing_buf = buf + buflen - 1;
3940
3941 if (write_data) {
3942 memcpy(align_buf, trailing_buf, 1);
3943 writew(le16_to_cpu(align_buf[0]), mmio);
3944 } else {
3945 align_buf[0] = cpu_to_le16(readw(mmio));
3946 memcpy(trailing_buf, align_buf, 1);
3947 }
3948 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003949}
3950
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003951/**
3952 * ata_pio_data_xfer - Transfer data by PIO
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003953 * @adev: device to target
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003954 * @buf: data buffer
3955 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003956 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003957 *
3958 * Transfer data from/to the device data register by PIO.
3959 *
3960 * LOCKING:
3961 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003962 */
3963
Tejun Heo88574552006-06-25 20:00:35 +09003964void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003965 unsigned int buflen, int write_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003966{
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003967 struct ata_port *ap = adev->ap;
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003968 unsigned int words = buflen >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003970 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003971 if (write_data)
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003972 outsw(ap->ioaddr.data_addr, buf, words);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973 else
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003974 insw(ap->ioaddr.data_addr, buf, words);
3975
3976 /* Transfer trailing 1 byte, if any. */
3977 if (unlikely(buflen & 0x01)) {
3978 u16 align_buf[1] = { 0 };
3979 unsigned char *trailing_buf = buf + buflen - 1;
3980
3981 if (write_data) {
3982 memcpy(align_buf, trailing_buf, 1);
3983 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3984 } else {
3985 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3986 memcpy(trailing_buf, align_buf, 1);
3987 }
3988 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003989}
3990
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003991/**
Alan Cox75e99582006-05-24 14:14:41 +01003992 * ata_pio_data_xfer_noirq - Transfer data by PIO
3993 * @adev: device to target
3994 * @buf: data buffer
3995 * @buflen: buffer length
3996 * @write_data: read/write
3997 *
Tejun Heo88574552006-06-25 20:00:35 +09003998 * Transfer data from/to the device data register by PIO. Do the
Alan Cox75e99582006-05-24 14:14:41 +01003999 * transfer with interrupts disabled.
4000 *
4001 * LOCKING:
4002 * Inherited from caller.
4003 */
4004
4005void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
4006 unsigned int buflen, int write_data)
4007{
4008 unsigned long flags;
4009 local_irq_save(flags);
4010 ata_pio_data_xfer(adev, buf, buflen, write_data);
4011 local_irq_restore(flags);
4012}
4013
4014
4015/**
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004016 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
4017 * @qc: Command on going
4018 *
4019 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
4020 *
4021 * LOCKING:
4022 * Inherited from caller.
4023 */
4024
Linus Torvalds1da177e2005-04-16 15:20:36 -07004025static void ata_pio_sector(struct ata_queued_cmd *qc)
4026{
4027 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004028 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004029 struct ata_port *ap = qc->ap;
4030 struct page *page;
4031 unsigned int offset;
4032 unsigned char *buf;
4033
4034 if (qc->cursect == (qc->nsect - 1))
Albert Lee14be71f2005-09-27 17:36:35 +08004035 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004036
4037 page = sg[qc->cursg].page;
4038 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
4039
4040 /* get the current page and offset */
4041 page = nth_page(page, (offset >> PAGE_SHIFT));
4042 offset %= PAGE_SIZE;
4043
Albert Lee7282aa42005-10-09 09:46:07 -04004044 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4045
Albert Lee91b8b312005-10-09 09:48:44 -04004046 if (PageHighMem(page)) {
4047 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04004048
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004049 /* FIXME: use a bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04004050 local_irq_save(flags);
4051 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04004052
Albert Lee91b8b312005-10-09 09:48:44 -04004053 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004054 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004055
4056 kunmap_atomic(buf, KM_IRQ0);
4057 local_irq_restore(flags);
4058 } else {
4059 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004060 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004062
4063 qc->cursect++;
4064 qc->cursg_ofs++;
4065
Albert Lee32529e02005-05-26 03:49:42 -04004066 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004067 qc->cursg++;
4068 qc->cursg_ofs = 0;
4069 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004070}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004071
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004072/**
Albert Lee07f6f7d2005-11-01 19:33:20 +08004073 * ata_pio_sectors - Transfer one or many 512-byte sectors.
4074 * @qc: Command on going
4075 *
Jeff Garzikc81e29b2006-05-24 01:49:12 -04004076 * Transfer one or many ATA_SECT_SIZE of data from/to the
Albert Lee07f6f7d2005-11-01 19:33:20 +08004077 * ATA device for the DRQ request.
4078 *
4079 * LOCKING:
4080 * Inherited from caller.
4081 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082
Albert Lee07f6f7d2005-11-01 19:33:20 +08004083static void ata_pio_sectors(struct ata_queued_cmd *qc)
4084{
4085 if (is_multi_taskfile(&qc->tf)) {
4086 /* READ/WRITE MULTIPLE */
4087 unsigned int nsect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004088
Jeff Garzik587005d2006-02-11 18:17:32 -05004089 WARN_ON(qc->dev->multi_count == 0);
Albert Lee07f6f7d2005-11-01 19:33:20 +08004090
4091 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
4092 while (nsect--)
4093 ata_pio_sector(qc);
4094 } else
4095 ata_pio_sector(qc);
4096}
4097
4098/**
Albert Leec71c1852005-10-04 06:03:45 -04004099 * atapi_send_cdb - Write CDB bytes to hardware
4100 * @ap: Port to which ATAPI device is attached.
4101 * @qc: Taskfile currently active
4102 *
4103 * When device has indicated its readiness to accept
4104 * a CDB, this function is called. Send the CDB.
4105 *
4106 * LOCKING:
4107 * caller.
4108 */
4109
4110static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
4111{
4112 /* send SCSI cdb */
4113 DPRINTK("send cdb\n");
Jeff Garzikdb024d52006-02-13 00:23:57 -05004114 WARN_ON(qc->dev->cdb_len < 12);
Albert Leec71c1852005-10-04 06:03:45 -04004115
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004116 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
Albert Leec71c1852005-10-04 06:03:45 -04004117 ata_altstatus(ap); /* flush */
4118
4119 switch (qc->tf.protocol) {
4120 case ATA_PROT_ATAPI:
4121 ap->hsm_task_state = HSM_ST;
4122 break;
4123 case ATA_PROT_ATAPI_NODATA:
4124 ap->hsm_task_state = HSM_ST_LAST;
4125 break;
4126 case ATA_PROT_ATAPI_DMA:
4127 ap->hsm_task_state = HSM_ST_LAST;
4128 /* initiate bmdma */
4129 ap->ops->bmdma_start(qc);
4130 break;
4131 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004132}
4133
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004134/**
4135 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
4136 * @qc: Command on going
4137 * @bytes: number of bytes
4138 *
4139 * Transfer Transfer data from/to the ATAPI device.
4140 *
4141 * LOCKING:
4142 * Inherited from caller.
4143 *
4144 */
4145
Linus Torvalds1da177e2005-04-16 15:20:36 -07004146static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
4147{
4148 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004149 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004150 struct ata_port *ap = qc->ap;
4151 struct page *page;
4152 unsigned char *buf;
4153 unsigned int offset, count;
4154
Albert Lee563a6e12005-08-12 14:17:50 +08004155 if (qc->curbytes + bytes >= qc->nbytes)
Albert Lee14be71f2005-09-27 17:36:35 +08004156 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004157
4158next_sg:
Albert Lee563a6e12005-08-12 14:17:50 +08004159 if (unlikely(qc->cursg >= qc->n_elem)) {
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004160 /*
Albert Lee563a6e12005-08-12 14:17:50 +08004161 * The end of qc->sg is reached and the device expects
4162 * more data to transfer. In order not to overrun qc->sg
4163 * and fulfill length specified in the byte count register,
4164 * - for read case, discard trailing data from the device
4165 * - for write case, padding zero data to the device
4166 */
4167 u16 pad_buf[1] = { 0 };
4168 unsigned int words = bytes >> 1;
4169 unsigned int i;
4170
4171 if (words) /* warning if bytes > 1 */
Tejun Heof15a1da2006-05-15 20:57:56 +09004172 ata_dev_printk(qc->dev, KERN_WARNING,
4173 "%u bytes trailing data\n", bytes);
Albert Lee563a6e12005-08-12 14:17:50 +08004174
4175 for (i = 0; i < words; i++)
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004176 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
Albert Lee563a6e12005-08-12 14:17:50 +08004177
Albert Lee14be71f2005-09-27 17:36:35 +08004178 ap->hsm_task_state = HSM_ST_LAST;
Albert Lee563a6e12005-08-12 14:17:50 +08004179 return;
4180 }
4181
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004182 sg = &qc->__sg[qc->cursg];
Linus Torvalds1da177e2005-04-16 15:20:36 -07004183
Linus Torvalds1da177e2005-04-16 15:20:36 -07004184 page = sg->page;
4185 offset = sg->offset + qc->cursg_ofs;
4186
4187 /* get the current page and offset */
4188 page = nth_page(page, (offset >> PAGE_SHIFT));
4189 offset %= PAGE_SIZE;
4190
Albert Lee6952df02005-06-06 15:56:03 +08004191 /* don't overrun current sg */
Albert Lee32529e02005-05-26 03:49:42 -04004192 count = min(sg->length - qc->cursg_ofs, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004193
4194 /* don't cross page boundaries */
4195 count = min(count, (unsigned int)PAGE_SIZE - offset);
4196
Albert Lee7282aa42005-10-09 09:46:07 -04004197 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4198
Albert Lee91b8b312005-10-09 09:48:44 -04004199 if (PageHighMem(page)) {
4200 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04004201
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004202 /* FIXME: use bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04004203 local_irq_save(flags);
4204 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04004205
Albert Lee91b8b312005-10-09 09:48:44 -04004206 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004207 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004208
4209 kunmap_atomic(buf, KM_IRQ0);
4210 local_irq_restore(flags);
4211 } else {
4212 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004213 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004215
4216 bytes -= count;
4217 qc->curbytes += count;
4218 qc->cursg_ofs += count;
4219
Albert Lee32529e02005-05-26 03:49:42 -04004220 if (qc->cursg_ofs == sg->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004221 qc->cursg++;
4222 qc->cursg_ofs = 0;
4223 }
4224
Albert Lee563a6e12005-08-12 14:17:50 +08004225 if (bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004226 goto next_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004227}
4228
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004229/**
4230 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4231 * @qc: Command on going
4232 *
4233 * Transfer Transfer data from/to the ATAPI device.
4234 *
4235 * LOCKING:
4236 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004237 */
4238
Linus Torvalds1da177e2005-04-16 15:20:36 -07004239static void atapi_pio_bytes(struct ata_queued_cmd *qc)
4240{
4241 struct ata_port *ap = qc->ap;
4242 struct ata_device *dev = qc->dev;
4243 unsigned int ireason, bc_lo, bc_hi, bytes;
4244 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
4245
Albert Leeeec4c3f2006-05-18 17:51:10 +08004246 /* Abuse qc->result_tf for temp storage of intermediate TF
4247 * here to save some kernel stack usage.
4248 * For normal completion, qc->result_tf is not relevant. For
4249 * error, qc->result_tf is later overwritten by ata_qc_complete().
4250 * So, the correctness of qc->result_tf is not affected.
4251 */
4252 ap->ops->tf_read(ap, &qc->result_tf);
4253 ireason = qc->result_tf.nsect;
4254 bc_lo = qc->result_tf.lbam;
4255 bc_hi = qc->result_tf.lbah;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004256 bytes = (bc_hi << 8) | bc_lo;
4257
4258 /* shall be cleared to zero, indicating xfer of data */
4259 if (ireason & (1 << 0))
4260 goto err_out;
4261
4262 /* make sure transfer direction matches expected */
4263 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
4264 if (do_write != i_write)
4265 goto err_out;
4266
Albert Lee312f7da2005-09-27 17:38:03 +08004267 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
4268
Linus Torvalds1da177e2005-04-16 15:20:36 -07004269 __atapi_pio_bytes(qc, bytes);
4270
4271 return;
4272
4273err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09004274 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
Tejun Heo11a56d22006-01-23 13:09:36 +09004275 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08004276 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004277}
4278
4279/**
Albert Leec234fb02006-03-25 17:58:38 +08004280 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4281 * @ap: the target ata_port
4282 * @qc: qc on going
Linus Torvalds1da177e2005-04-16 15:20:36 -07004283 *
Albert Leec234fb02006-03-25 17:58:38 +08004284 * RETURNS:
4285 * 1 if ok in workqueue, 0 otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004286 */
Albert Leec234fb02006-03-25 17:58:38 +08004287
4288static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004289{
Albert Leec234fb02006-03-25 17:58:38 +08004290 if (qc->tf.flags & ATA_TFLAG_POLLING)
4291 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004292
Albert Leec234fb02006-03-25 17:58:38 +08004293 if (ap->hsm_task_state == HSM_ST_FIRST) {
4294 if (qc->tf.protocol == ATA_PROT_PIO &&
4295 (qc->tf.flags & ATA_TFLAG_WRITE))
4296 return 1;
4297
4298 if (is_atapi_taskfile(&qc->tf) &&
4299 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4300 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004301 }
4302
Albert Leec234fb02006-03-25 17:58:38 +08004303 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004304}
4305
Albert Leec234fb02006-03-25 17:58:38 +08004306/**
Tejun Heoc17ea202006-05-15 20:59:29 +09004307 * ata_hsm_qc_complete - finish a qc running on standard HSM
4308 * @qc: Command to complete
4309 * @in_wq: 1 if called from workqueue, 0 otherwise
4310 *
4311 * Finish @qc which is running on standard HSM.
4312 *
4313 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004314 * If @in_wq is zero, spin_lock_irqsave(host lock).
Tejun Heoc17ea202006-05-15 20:59:29 +09004315 * Otherwise, none on entry and grabs host lock.
4316 */
4317static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
4318{
4319 struct ata_port *ap = qc->ap;
4320 unsigned long flags;
4321
4322 if (ap->ops->error_handler) {
4323 if (in_wq) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04004324 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004325
Jeff Garzikcca39742006-08-24 03:19:22 -04004326 /* EH might have kicked in while host lock is
4327 * released.
Tejun Heoc17ea202006-05-15 20:59:29 +09004328 */
4329 qc = ata_qc_from_tag(ap, qc->tag);
4330 if (qc) {
4331 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4332 ata_irq_on(ap);
4333 ata_qc_complete(qc);
4334 } else
4335 ata_port_freeze(ap);
4336 }
4337
Jeff Garzikba6a1302006-06-22 23:46:10 -04004338 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004339 } else {
4340 if (likely(!(qc->err_mask & AC_ERR_HSM)))
4341 ata_qc_complete(qc);
4342 else
4343 ata_port_freeze(ap);
4344 }
4345 } else {
4346 if (in_wq) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04004347 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004348 ata_irq_on(ap);
4349 ata_qc_complete(qc);
Jeff Garzikba6a1302006-06-22 23:46:10 -04004350 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004351 } else
4352 ata_qc_complete(qc);
4353 }
Jeff Garzikc81e29b2006-05-24 01:49:12 -04004354
4355 ata_altstatus(ap); /* flush */
Tejun Heoc17ea202006-05-15 20:59:29 +09004356}
4357
4358/**
Albert Leebb5cb292006-03-25 17:48:02 +08004359 * ata_hsm_move - move the HSM to the next state.
4360 * @ap: the target ata_port
4361 * @qc: qc on going
4362 * @status: current device status
4363 * @in_wq: 1 if called from workqueue, 0 otherwise
4364 *
4365 * RETURNS:
4366 * 1 when poll next status needed, 0 otherwise.
4367 */
Tejun Heo9a1004d2006-05-31 18:27:52 +09004368int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
4369 u8 status, int in_wq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004370{
Albert Leebb5cb292006-03-25 17:48:02 +08004371 unsigned long flags = 0;
4372 int poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004373
Albert Lee6912ccd2006-03-25 17:45:49 +08004374 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
Albert Lee0565c262006-02-13 18:55:25 +08004375
Albert Leebb5cb292006-03-25 17:48:02 +08004376 /* Make sure ata_qc_issue_prot() does not throw things
4377 * like DMA polling into the workqueue. Notice that
4378 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
Albert Lee1c848982005-12-05 15:40:15 +08004379 */
Albert Leec234fb02006-03-25 17:58:38 +08004380 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
Albert Lee1c848982005-12-05 15:40:15 +08004381
Albert Leee2cec772006-03-25 17:43:49 +08004382fsm_start:
Albert Lee999bb6f2006-03-25 18:07:48 +08004383 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4384 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004385
Albert Leee2cec772006-03-25 17:43:49 +08004386 switch (ap->hsm_task_state) {
4387 case HSM_ST_FIRST:
Albert Leebb5cb292006-03-25 17:48:02 +08004388 /* Send first data block or PACKET CDB */
4389
4390 /* If polling, we will stay in the work queue after
4391 * sending the data. Otherwise, interrupt handler
4392 * takes over after sending the data.
4393 */
4394 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
4395
Albert Leee2cec772006-03-25 17:43:49 +08004396 /* check device status */
Albert Lee3655d1d2006-05-19 11:43:04 +08004397 if (unlikely((status & ATA_DRQ) == 0)) {
4398 /* handle BSY=0, DRQ=0 as error */
4399 if (likely(status & (ATA_ERR | ATA_DF)))
4400 /* device stops HSM for abort/error */
4401 qc->err_mask |= AC_ERR_DEV;
4402 else
4403 /* HSM violation. Let EH handle this */
4404 qc->err_mask |= AC_ERR_HSM;
4405
Albert Leee2cec772006-03-25 17:43:49 +08004406 ap->hsm_task_state = HSM_ST_ERR;
4407 goto fsm_start;
4408 }
4409
Albert Lee71601952006-03-25 18:11:12 +08004410 /* Device should not ask for data transfer (DRQ=1)
4411 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004412 * We ignore DRQ here and stop the HSM by
4413 * changing hsm_task_state to HSM_ST_ERR and
4414 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004415 */
4416 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4417 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4418 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004419 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004420 ap->hsm_task_state = HSM_ST_ERR;
4421 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004422 }
4423
Albert Leebb5cb292006-03-25 17:48:02 +08004424 /* Send the CDB (atapi) or the first data block (ata pio out).
4425 * During the state transition, interrupt handler shouldn't
4426 * be invoked before the data transfer is complete and
4427 * hsm_task_state is changed. Hence, the following locking.
4428 */
4429 if (in_wq)
Jeff Garzikba6a1302006-06-22 23:46:10 -04004430 spin_lock_irqsave(ap->lock, flags);
Albert Leee2cec772006-03-25 17:43:49 +08004431
Albert Leebb5cb292006-03-25 17:48:02 +08004432 if (qc->tf.protocol == ATA_PROT_PIO) {
4433 /* PIO data out protocol.
4434 * send first data block.
4435 */
4436
4437 /* ata_pio_sectors() might change the state
4438 * to HSM_ST_LAST. so, the state is changed here
4439 * before ata_pio_sectors().
4440 */
4441 ap->hsm_task_state = HSM_ST;
4442 ata_pio_sectors(qc);
4443 ata_altstatus(ap); /* flush */
4444 } else
4445 /* send CDB */
4446 atapi_send_cdb(ap, qc);
4447
4448 if (in_wq)
Jeff Garzikba6a1302006-06-22 23:46:10 -04004449 spin_unlock_irqrestore(ap->lock, flags);
Albert Leebb5cb292006-03-25 17:48:02 +08004450
4451 /* if polling, ata_pio_task() handles the rest.
4452 * otherwise, interrupt handler takes over from here.
4453 */
Albert Leee2cec772006-03-25 17:43:49 +08004454 break;
4455
4456 case HSM_ST:
4457 /* complete command or read/write the data register */
4458 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4459 /* ATAPI PIO protocol */
4460 if ((status & ATA_DRQ) == 0) {
Albert Lee3655d1d2006-05-19 11:43:04 +08004461 /* No more data to transfer or device error.
4462 * Device error will be tagged in HSM_ST_LAST.
4463 */
Albert Leee2cec772006-03-25 17:43:49 +08004464 ap->hsm_task_state = HSM_ST_LAST;
4465 goto fsm_start;
4466 }
4467
Albert Lee71601952006-03-25 18:11:12 +08004468 /* Device should not ask for data transfer (DRQ=1)
4469 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004470 * We ignore DRQ here and stop the HSM by
4471 * changing hsm_task_state to HSM_ST_ERR and
4472 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004473 */
4474 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4475 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4476 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004477 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004478 ap->hsm_task_state = HSM_ST_ERR;
4479 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004480 }
4481
Albert Leee2cec772006-03-25 17:43:49 +08004482 atapi_pio_bytes(qc);
4483
4484 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4485 /* bad ireason reported by device */
4486 goto fsm_start;
4487
4488 } else {
4489 /* ATA PIO protocol */
4490 if (unlikely((status & ATA_DRQ) == 0)) {
4491 /* handle BSY=0, DRQ=0 as error */
Albert Lee3655d1d2006-05-19 11:43:04 +08004492 if (likely(status & (ATA_ERR | ATA_DF)))
4493 /* device stops HSM for abort/error */
4494 qc->err_mask |= AC_ERR_DEV;
4495 else
Tejun Heo55a8e2c2006-11-10 18:08:10 +09004496 /* HSM violation. Let EH handle this.
4497 * Phantom devices also trigger this
4498 * condition. Mark hint.
4499 */
4500 qc->err_mask |= AC_ERR_HSM |
4501 AC_ERR_NODEV_HINT;
Albert Lee3655d1d2006-05-19 11:43:04 +08004502
Albert Leee2cec772006-03-25 17:43:49 +08004503 ap->hsm_task_state = HSM_ST_ERR;
4504 goto fsm_start;
4505 }
4506
Albert Leeeee6c322006-04-01 17:38:43 +08004507 /* For PIO reads, some devices may ask for
4508 * data transfer (DRQ=1) alone with ERR=1.
4509 * We respect DRQ here and transfer one
4510 * block of junk data before changing the
4511 * hsm_task_state to HSM_ST_ERR.
4512 *
4513 * For PIO writes, ERR=1 DRQ=1 doesn't make
4514 * sense since the data block has been
4515 * transferred to the device.
Albert Lee71601952006-03-25 18:11:12 +08004516 */
4517 if (unlikely(status & (ATA_ERR | ATA_DF))) {
Albert Lee71601952006-03-25 18:11:12 +08004518 /* data might be corrputed */
4519 qc->err_mask |= AC_ERR_DEV;
Albert Leeeee6c322006-04-01 17:38:43 +08004520
4521 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
4522 ata_pio_sectors(qc);
4523 ata_altstatus(ap);
4524 status = ata_wait_idle(ap);
4525 }
4526
Albert Lee3655d1d2006-05-19 11:43:04 +08004527 if (status & (ATA_BUSY | ATA_DRQ))
4528 qc->err_mask |= AC_ERR_HSM;
4529
Albert Leeeee6c322006-04-01 17:38:43 +08004530 /* ata_pio_sectors() might change the
4531 * state to HSM_ST_LAST. so, the state
4532 * is changed after ata_pio_sectors().
4533 */
4534 ap->hsm_task_state = HSM_ST_ERR;
4535 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004536 }
4537
Albert Leee2cec772006-03-25 17:43:49 +08004538 ata_pio_sectors(qc);
4539
4540 if (ap->hsm_task_state == HSM_ST_LAST &&
4541 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4542 /* all data read */
4543 ata_altstatus(ap);
Albert Lee52a32202006-03-25 18:18:15 +08004544 status = ata_wait_idle(ap);
Albert Leee2cec772006-03-25 17:43:49 +08004545 goto fsm_start;
4546 }
4547 }
4548
4549 ata_altstatus(ap); /* flush */
Albert Leebb5cb292006-03-25 17:48:02 +08004550 poll_next = 1;
Albert Leee2cec772006-03-25 17:43:49 +08004551 break;
4552
4553 case HSM_ST_LAST:
Albert Lee6912ccd2006-03-25 17:45:49 +08004554 if (unlikely(!ata_ok(status))) {
4555 qc->err_mask |= __ac_err_mask(status);
Albert Leee2cec772006-03-25 17:43:49 +08004556 ap->hsm_task_state = HSM_ST_ERR;
4557 goto fsm_start;
4558 }
4559
4560 /* no more data to transfer */
Albert Lee4332a772006-04-03 17:43:24 +08004561 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4562 ap->id, qc->dev->devno, status);
Albert Leee2cec772006-03-25 17:43:49 +08004563
Albert Lee6912ccd2006-03-25 17:45:49 +08004564 WARN_ON(qc->err_mask);
4565
Albert Leee2cec772006-03-25 17:43:49 +08004566 ap->hsm_task_state = HSM_ST_IDLE;
4567
4568 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004569 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004570
4571 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004572 break;
4573
4574 case HSM_ST_ERR:
Albert Leee2cec772006-03-25 17:43:49 +08004575 /* make sure qc->err_mask is available to
4576 * know what's wrong and recover
4577 */
4578 WARN_ON(qc->err_mask == 0);
4579
4580 ap->hsm_task_state = HSM_ST_IDLE;
Albert Leebb5cb292006-03-25 17:48:02 +08004581
Albert Lee999bb6f2006-03-25 18:07:48 +08004582 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004583 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004584
4585 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004586 break;
4587 default:
Albert Leebb5cb292006-03-25 17:48:02 +08004588 poll_next = 0;
Albert Lee6912ccd2006-03-25 17:45:49 +08004589 BUG();
Albert Leee2cec772006-03-25 17:43:49 +08004590 }
4591
Albert Leebb5cb292006-03-25 17:48:02 +08004592 return poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004593}
4594
David Howells65f27f32006-11-22 14:55:48 +00004595static void ata_pio_task(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004596{
David Howells65f27f32006-11-22 14:55:48 +00004597 struct ata_port *ap =
4598 container_of(work, struct ata_port, port_task.work);
4599 struct ata_queued_cmd *qc = ap->port_task_data;
Albert Leea1af3732006-03-25 17:50:15 +08004600 u8 status;
4601 int poll_next;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004602
4603fsm_start:
Albert Leea1af3732006-03-25 17:50:15 +08004604 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004605
Albert Leea1af3732006-03-25 17:50:15 +08004606 /*
4607 * This is purely heuristic. This is a fast path.
4608 * Sometimes when we enter, BSY will be cleared in
4609 * a chk-status or two. If not, the drive is probably seeking
4610 * or something. Snooze for a couple msecs, then
4611 * chk-status again. If still busy, queue delayed work.
4612 */
4613 status = ata_busy_wait(ap, ATA_BUSY, 5);
4614 if (status & ATA_BUSY) {
4615 msleep(2);
4616 status = ata_busy_wait(ap, ATA_BUSY, 10);
4617 if (status & ATA_BUSY) {
Albert Lee31ce6da2006-04-03 18:31:44 +08004618 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
Albert Leea1af3732006-03-25 17:50:15 +08004619 return;
4620 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004621 }
4622
Albert Leea1af3732006-03-25 17:50:15 +08004623 /* move the HSM */
4624 poll_next = ata_hsm_move(ap, qc, status, 1);
4625
4626 /* another command or interrupt handler
4627 * may be running at this point.
4628 */
4629 if (poll_next)
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004630 goto fsm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004631}
4632
Linus Torvalds1da177e2005-04-16 15:20:36 -07004633/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004634 * ata_qc_new - Request an available ATA command, for queueing
4635 * @ap: Port associated with device @dev
4636 * @dev: Device from whom we request an available command structure
4637 *
4638 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004639 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004640 */
4641
4642static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4643{
4644 struct ata_queued_cmd *qc = NULL;
4645 unsigned int i;
4646
Tejun Heoe3180492006-05-15 20:58:09 +09004647 /* no command while frozen */
Tejun Heob51e9e52006-06-29 01:29:30 +09004648 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
Tejun Heoe3180492006-05-15 20:58:09 +09004649 return NULL;
4650
Tejun Heo2ab7db12006-05-15 20:58:02 +09004651 /* the last tag is reserved for internal command. */
4652 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
Tejun Heo6cec4a32006-05-15 21:03:41 +09004653 if (!test_and_set_bit(i, &ap->qc_allocated)) {
Tejun Heof69499f2006-05-15 20:58:03 +09004654 qc = __ata_qc_from_tag(ap, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004655 break;
4656 }
4657
4658 if (qc)
4659 qc->tag = i;
4660
4661 return qc;
4662}
4663
4664/**
4665 * ata_qc_new_init - Request an available ATA command, and initialize it
Linus Torvalds1da177e2005-04-16 15:20:36 -07004666 * @dev: Device from whom we request an available command structure
4667 *
4668 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004669 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004670 */
4671
Tejun Heo3373efd2006-05-15 20:57:53 +09004672struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004673{
Tejun Heo3373efd2006-05-15 20:57:53 +09004674 struct ata_port *ap = dev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004675 struct ata_queued_cmd *qc;
4676
4677 qc = ata_qc_new(ap);
4678 if (qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004679 qc->scsicmd = NULL;
4680 qc->ap = ap;
4681 qc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004682
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05004683 ata_qc_reinit(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004684 }
4685
4686 return qc;
4687}
4688
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689/**
4690 * ata_qc_free - free unused ata_queued_cmd
4691 * @qc: Command to complete
4692 *
4693 * Designed to free unused ata_queued_cmd object
4694 * in case something prevents using it.
4695 *
4696 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004697 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004698 */
4699void ata_qc_free(struct ata_queued_cmd *qc)
4700{
Tejun Heo4ba946e2006-01-23 13:09:36 +09004701 struct ata_port *ap = qc->ap;
4702 unsigned int tag;
4703
Tejun Heoa46314742006-02-11 19:11:13 +09004704 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004705
Tejun Heo4ba946e2006-01-23 13:09:36 +09004706 qc->flags = 0;
4707 tag = qc->tag;
4708 if (likely(ata_tag_valid(tag))) {
Tejun Heo4ba946e2006-01-23 13:09:36 +09004709 qc->tag = ATA_TAG_POISON;
Tejun Heo6cec4a32006-05-15 21:03:41 +09004710 clear_bit(tag, &ap->qc_allocated);
Tejun Heo4ba946e2006-01-23 13:09:36 +09004711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004712}
4713
Tejun Heo76014422006-02-11 15:13:49 +09004714void __ata_qc_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004715{
Tejun Heodedaf2b2006-05-15 21:03:43 +09004716 struct ata_port *ap = qc->ap;
4717
Tejun Heoa46314742006-02-11 19:11:13 +09004718 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4719 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004720
4721 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4722 ata_sg_clean(qc);
4723
Tejun Heo7401abf2006-05-15 20:57:32 +09004724 /* command should be marked inactive atomically with qc completion */
Tejun Heodedaf2b2006-05-15 21:03:43 +09004725 if (qc->tf.protocol == ATA_PROT_NCQ)
4726 ap->sactive &= ~(1 << qc->tag);
4727 else
4728 ap->active_tag = ATA_TAG_POISON;
Tejun Heo7401abf2006-05-15 20:57:32 +09004729
Albert Lee3f3791d2005-08-16 14:25:38 +08004730 /* atapi: mark qc as inactive to prevent the interrupt handler
4731 * from completing the command twice later, before the error handler
4732 * is called. (when rc != 0 and atapi request sense is needed)
4733 */
4734 qc->flags &= ~ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004735 ap->qc_active &= ~(1 << qc->tag);
Albert Lee3f3791d2005-08-16 14:25:38 +08004736
Linus Torvalds1da177e2005-04-16 15:20:36 -07004737 /* call completion callback */
Tejun Heo77853bf2006-01-23 13:09:36 +09004738 qc->complete_fn(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004739}
4740
Tejun Heo39599a52006-11-14 22:37:35 +09004741static void fill_result_tf(struct ata_queued_cmd *qc)
4742{
4743 struct ata_port *ap = qc->ap;
4744
4745 ap->ops->tf_read(ap, &qc->result_tf);
4746 qc->result_tf.flags = qc->tf.flags;
4747}
4748
Tejun Heof686bcb2006-05-15 20:58:05 +09004749/**
4750 * ata_qc_complete - Complete an active ATA command
4751 * @qc: Command to complete
4752 * @err_mask: ATA Status register contents
4753 *
4754 * Indicate to the mid and upper layers that an ATA
4755 * command has completed, with either an ok or not-ok status.
4756 *
4757 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004758 * spin_lock_irqsave(host lock)
Tejun Heof686bcb2006-05-15 20:58:05 +09004759 */
4760void ata_qc_complete(struct ata_queued_cmd *qc)
4761{
4762 struct ata_port *ap = qc->ap;
4763
4764 /* XXX: New EH and old EH use different mechanisms to
4765 * synchronize EH with regular execution path.
4766 *
4767 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4768 * Normal execution path is responsible for not accessing a
4769 * failed qc. libata core enforces the rule by returning NULL
4770 * from ata_qc_from_tag() for failed qcs.
4771 *
4772 * Old EH depends on ata_qc_complete() nullifying completion
4773 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4774 * not synchronize with interrupt handler. Only PIO task is
4775 * taken care of.
4776 */
4777 if (ap->ops->error_handler) {
Tejun Heob51e9e52006-06-29 01:29:30 +09004778 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
Tejun Heof686bcb2006-05-15 20:58:05 +09004779
4780 if (unlikely(qc->err_mask))
4781 qc->flags |= ATA_QCFLAG_FAILED;
4782
4783 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4784 if (!ata_tag_internal(qc->tag)) {
4785 /* always fill result TF for failed qc */
Tejun Heo39599a52006-11-14 22:37:35 +09004786 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004787 ata_qc_schedule_eh(qc);
4788 return;
4789 }
4790 }
4791
4792 /* read result TF if requested */
4793 if (qc->flags & ATA_QCFLAG_RESULT_TF)
Tejun Heo39599a52006-11-14 22:37:35 +09004794 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004795
4796 __ata_qc_complete(qc);
4797 } else {
4798 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4799 return;
4800
4801 /* read result TF if failed or requested */
4802 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
Tejun Heo39599a52006-11-14 22:37:35 +09004803 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004804
4805 __ata_qc_complete(qc);
4806 }
4807}
4808
Tejun Heodedaf2b2006-05-15 21:03:43 +09004809/**
4810 * ata_qc_complete_multiple - Complete multiple qcs successfully
4811 * @ap: port in question
4812 * @qc_active: new qc_active mask
4813 * @finish_qc: LLDD callback invoked before completing a qc
4814 *
4815 * Complete in-flight commands. This functions is meant to be
4816 * called from low-level driver's interrupt routine to complete
4817 * requests normally. ap->qc_active and @qc_active is compared
4818 * and commands are completed accordingly.
4819 *
4820 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004821 * spin_lock_irqsave(host lock)
Tejun Heodedaf2b2006-05-15 21:03:43 +09004822 *
4823 * RETURNS:
4824 * Number of completed commands on success, -errno otherwise.
4825 */
4826int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
4827 void (*finish_qc)(struct ata_queued_cmd *))
4828{
4829 int nr_done = 0;
4830 u32 done_mask;
4831 int i;
4832
4833 done_mask = ap->qc_active ^ qc_active;
4834
4835 if (unlikely(done_mask & qc_active)) {
4836 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4837 "(%08x->%08x)\n", ap->qc_active, qc_active);
4838 return -EINVAL;
4839 }
4840
4841 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4842 struct ata_queued_cmd *qc;
4843
4844 if (!(done_mask & (1 << i)))
4845 continue;
4846
4847 if ((qc = ata_qc_from_tag(ap, i))) {
4848 if (finish_qc)
4849 finish_qc(qc);
4850 ata_qc_complete(qc);
4851 nr_done++;
4852 }
4853 }
4854
4855 return nr_done;
4856}
4857
Linus Torvalds1da177e2005-04-16 15:20:36 -07004858static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4859{
4860 struct ata_port *ap = qc->ap;
4861
4862 switch (qc->tf.protocol) {
Tejun Heo3dc1d882006-05-15 21:03:45 +09004863 case ATA_PROT_NCQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004864 case ATA_PROT_DMA:
4865 case ATA_PROT_ATAPI_DMA:
4866 return 1;
4867
4868 case ATA_PROT_ATAPI:
4869 case ATA_PROT_PIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004870 if (ap->flags & ATA_FLAG_PIO_DMA)
4871 return 1;
4872
4873 /* fall through */
4874
4875 default:
4876 return 0;
4877 }
4878
4879 /* never reached */
4880}
4881
4882/**
4883 * ata_qc_issue - issue taskfile to device
4884 * @qc: command to issue to device
4885 *
4886 * Prepare an ATA command to submission to device.
4887 * This includes mapping the data into a DMA-able
4888 * area, filling in the S/G table, and finally
4889 * writing the taskfile to hardware, starting the command.
4890 *
4891 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004892 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004893 */
Tejun Heo8e0e6942006-03-31 20:41:11 +09004894void ata_qc_issue(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004895{
4896 struct ata_port *ap = qc->ap;
4897
Tejun Heodedaf2b2006-05-15 21:03:43 +09004898 /* Make sure only one non-NCQ command is outstanding. The
4899 * check is skipped for old EH because it reuses active qc to
4900 * request ATAPI sense.
4901 */
4902 WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
4903
4904 if (qc->tf.protocol == ATA_PROT_NCQ) {
4905 WARN_ON(ap->sactive & (1 << qc->tag));
4906 ap->sactive |= 1 << qc->tag;
4907 } else {
4908 WARN_ON(ap->sactive);
4909 ap->active_tag = qc->tag;
4910 }
4911
Tejun Heoe4a70e72006-03-31 20:36:47 +09004912 qc->flags |= ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004913 ap->qc_active |= 1 << qc->tag;
Tejun Heoe4a70e72006-03-31 20:36:47 +09004914
Linus Torvalds1da177e2005-04-16 15:20:36 -07004915 if (ata_should_dma_map(qc)) {
4916 if (qc->flags & ATA_QCFLAG_SG) {
4917 if (ata_sg_setup(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004918 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004919 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4920 if (ata_sg_setup_one(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004921 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004922 }
4923 } else {
4924 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4925 }
4926
4927 ap->ops->qc_prep(qc);
4928
Tejun Heo8e0e6942006-03-31 20:41:11 +09004929 qc->err_mask |= ap->ops->qc_issue(qc);
4930 if (unlikely(qc->err_mask))
4931 goto err;
4932 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004933
Tejun Heo8e436af2006-01-23 13:09:36 +09004934sg_err:
4935 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Tejun Heo8e0e6942006-03-31 20:41:11 +09004936 qc->err_mask |= AC_ERR_SYSTEM;
4937err:
4938 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004939}
4940
4941/**
4942 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4943 * @qc: command to issue to device
4944 *
4945 * Using various libata functions and hooks, this function
4946 * starts an ATA command. ATA commands are grouped into
4947 * classes called "protocols", and issuing each type of protocol
4948 * is slightly different.
4949 *
Edward Falk0baab862005-06-02 18:17:13 -04004950 * May be used as the qc_issue() entry in ata_port_operations.
4951 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004952 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004953 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004954 *
4955 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004956 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004957 */
4958
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004959unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004960{
4961 struct ata_port *ap = qc->ap;
4962
Albert Leee50362e2005-09-27 17:39:50 +08004963 /* Use polling pio if the LLD doesn't handle
4964 * interrupt driven pio and atapi CDB interrupt.
4965 */
4966 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4967 switch (qc->tf.protocol) {
4968 case ATA_PROT_PIO:
Albert Leee3472cb2006-12-07 11:37:58 +08004969 case ATA_PROT_NODATA:
Albert Leee50362e2005-09-27 17:39:50 +08004970 case ATA_PROT_ATAPI:
4971 case ATA_PROT_ATAPI_NODATA:
4972 qc->tf.flags |= ATA_TFLAG_POLLING;
4973 break;
4974 case ATA_PROT_ATAPI_DMA:
4975 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
Albert Lee3a778272006-06-22 13:00:25 +08004976 /* see ata_dma_blacklisted() */
Albert Leee50362e2005-09-27 17:39:50 +08004977 BUG();
4978 break;
4979 default:
4980 break;
4981 }
4982 }
4983
Tejun Heo3d3cca32006-11-16 10:50:50 +09004984 /* Some controllers show flaky interrupt behavior after
4985 * setting xfer mode. Use polling instead.
4986 */
4987 if (unlikely(qc->tf.command == ATA_CMD_SET_FEATURES &&
4988 qc->tf.feature == SETFEATURES_XFER) &&
4989 (ap->flags & ATA_FLAG_SETXFER_POLLING))
4990 qc->tf.flags |= ATA_TFLAG_POLLING;
4991
Albert Lee312f7da2005-09-27 17:38:03 +08004992 /* select the device */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004993 ata_dev_select(ap, qc->dev->devno, 1, 0);
4994
Albert Lee312f7da2005-09-27 17:38:03 +08004995 /* start the command */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004996 switch (qc->tf.protocol) {
4997 case ATA_PROT_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08004998 if (qc->tf.flags & ATA_TFLAG_POLLING)
4999 ata_qc_set_polling(qc);
5000
Jeff Garzike5338252005-10-30 21:37:17 -05005001 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08005002 ap->hsm_task_state = HSM_ST_LAST;
5003
5004 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08005005 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08005006
Linus Torvalds1da177e2005-04-16 15:20:36 -07005007 break;
5008
5009 case ATA_PROT_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05005010 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08005011
Linus Torvalds1da177e2005-04-16 15:20:36 -07005012 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5013 ap->ops->bmdma_setup(qc); /* set up bmdma */
5014 ap->ops->bmdma_start(qc); /* initiate bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08005015 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005016 break;
5017
Albert Lee312f7da2005-09-27 17:38:03 +08005018 case ATA_PROT_PIO:
5019 if (qc->tf.flags & ATA_TFLAG_POLLING)
5020 ata_qc_set_polling(qc);
5021
Jeff Garzike5338252005-10-30 21:37:17 -05005022 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08005023
Albert Lee54f00382005-09-30 19:14:19 +08005024 if (qc->tf.flags & ATA_TFLAG_WRITE) {
5025 /* PIO data out protocol */
5026 ap->hsm_task_state = HSM_ST_FIRST;
Albert Lee31ce6da2006-04-03 18:31:44 +08005027 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee54f00382005-09-30 19:14:19 +08005028
5029 /* always send first data block using
Albert Leee27486d2005-11-01 19:24:49 +08005030 * the ata_pio_task() codepath.
Albert Lee54f00382005-09-30 19:14:19 +08005031 */
Albert Lee312f7da2005-09-27 17:38:03 +08005032 } else {
Albert Lee54f00382005-09-30 19:14:19 +08005033 /* PIO data in protocol */
5034 ap->hsm_task_state = HSM_ST;
Albert Lee312f7da2005-09-27 17:38:03 +08005035
Albert Lee54f00382005-09-30 19:14:19 +08005036 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08005037 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08005038
Albert Lee54f00382005-09-30 19:14:19 +08005039 /* if polling, ata_pio_task() handles the rest.
5040 * otherwise, interrupt handler takes over from here.
5041 */
Albert Lee312f7da2005-09-27 17:38:03 +08005042 }
5043
Linus Torvalds1da177e2005-04-16 15:20:36 -07005044 break;
5045
5046 case ATA_PROT_ATAPI:
Linus Torvalds1da177e2005-04-16 15:20:36 -07005047 case ATA_PROT_ATAPI_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08005048 if (qc->tf.flags & ATA_TFLAG_POLLING)
5049 ata_qc_set_polling(qc);
5050
Jeff Garzike5338252005-10-30 21:37:17 -05005051 ata_tf_to_host(ap, &qc->tf);
Jeff Garzikf6ef65e2006-01-27 02:45:00 -05005052
Albert Lee312f7da2005-09-27 17:38:03 +08005053 ap->hsm_task_state = HSM_ST_FIRST;
5054
5055 /* send cdb by polling if no cdb interrupt */
5056 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
5057 (qc->tf.flags & ATA_TFLAG_POLLING))
Albert Lee31ce6da2006-04-03 18:31:44 +08005058 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005059 break;
5060
5061 case ATA_PROT_ATAPI_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05005062 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08005063
Linus Torvalds1da177e2005-04-16 15:20:36 -07005064 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5065 ap->ops->bmdma_setup(qc); /* set up bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08005066 ap->hsm_task_state = HSM_ST_FIRST;
5067
5068 /* send cdb by polling if no cdb interrupt */
5069 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Albert Lee31ce6da2006-04-03 18:31:44 +08005070 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005071 break;
5072
5073 default:
5074 WARN_ON(1);
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09005075 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005076 }
5077
5078 return 0;
5079}
5080
5081/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005082 * ata_host_intr - Handle host interrupt for given (port, task)
5083 * @ap: Port on which interrupt arrived (possibly...)
5084 * @qc: Taskfile currently active in engine
5085 *
5086 * Handle host interrupt for given queued command. Currently,
5087 * only DMA interrupts are handled. All other commands are
5088 * handled via polling with interrupts disabled (nIEN bit).
5089 *
5090 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04005091 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005092 *
5093 * RETURNS:
5094 * One if interrupt was handled, zero if not (shared irq).
5095 */
5096
5097inline unsigned int ata_host_intr (struct ata_port *ap,
5098 struct ata_queued_cmd *qc)
5099{
Tejun Heoea547632006-11-17 12:06:21 +09005100 struct ata_eh_info *ehi = &ap->eh_info;
Albert Lee312f7da2005-09-27 17:38:03 +08005101 u8 status, host_stat = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005102
Albert Lee312f7da2005-09-27 17:38:03 +08005103 VPRINTK("ata%u: protocol %d task_state %d\n",
5104 ap->id, qc->tf.protocol, ap->hsm_task_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005105
Albert Lee312f7da2005-09-27 17:38:03 +08005106 /* Check whether we are expecting interrupt in this state */
5107 switch (ap->hsm_task_state) {
5108 case HSM_ST_FIRST:
Albert Lee6912ccd2006-03-25 17:45:49 +08005109 /* Some pre-ATAPI-4 devices assert INTRQ
5110 * at this state when ready to receive CDB.
5111 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005112
Albert Lee312f7da2005-09-27 17:38:03 +08005113 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
5114 * The flag was turned on only for atapi devices.
5115 * No need to check is_atapi_taskfile(&qc->tf) again.
5116 */
5117 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005118 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005119 break;
Albert Lee312f7da2005-09-27 17:38:03 +08005120 case HSM_ST_LAST:
5121 if (qc->tf.protocol == ATA_PROT_DMA ||
5122 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
5123 /* check status of DMA engine */
5124 host_stat = ap->ops->bmdma_status(ap);
5125 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005126
Albert Lee312f7da2005-09-27 17:38:03 +08005127 /* if it's not our irq... */
5128 if (!(host_stat & ATA_DMA_INTR))
5129 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005130
Albert Lee312f7da2005-09-27 17:38:03 +08005131 /* before we do anything else, clear DMA-Start bit */
5132 ap->ops->bmdma_stop(qc);
Albert Leea4f16612005-12-26 16:40:53 +08005133
5134 if (unlikely(host_stat & ATA_DMA_ERR)) {
5135 /* error when transfering data to/from memory */
5136 qc->err_mask |= AC_ERR_HOST_BUS;
5137 ap->hsm_task_state = HSM_ST_ERR;
5138 }
Albert Lee312f7da2005-09-27 17:38:03 +08005139 }
5140 break;
5141 case HSM_ST:
5142 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005143 default:
5144 goto idle_irq;
5145 }
5146
Albert Lee312f7da2005-09-27 17:38:03 +08005147 /* check altstatus */
5148 status = ata_altstatus(ap);
5149 if (status & ATA_BUSY)
5150 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005151
Albert Lee312f7da2005-09-27 17:38:03 +08005152 /* check main status, clearing INTRQ */
5153 status = ata_chk_status(ap);
5154 if (unlikely(status & ATA_BUSY))
5155 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005156
Albert Lee312f7da2005-09-27 17:38:03 +08005157 /* ack bmdma irq events */
5158 ap->ops->irq_clear(ap);
5159
Albert Leebb5cb292006-03-25 17:48:02 +08005160 ata_hsm_move(ap, qc, status, 0);
Tejun Heoea547632006-11-17 12:06:21 +09005161
5162 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
5163 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
5164 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
5165
Linus Torvalds1da177e2005-04-16 15:20:36 -07005166 return 1; /* irq handled */
5167
5168idle_irq:
5169 ap->stats.idle_irq++;
5170
5171#ifdef ATA_IRQ_TRAP
5172 if ((ap->stats.idle_irq % 1000) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005173 ata_irq_ack(ap, 0); /* debug trap */
Tejun Heof15a1da2006-05-15 20:57:56 +09005174 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
Alan Cox23cfce82006-03-21 16:06:53 +00005175 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005176 }
5177#endif
5178 return 0; /* irq not handled */
5179}
5180
5181/**
5182 * ata_interrupt - Default ATA host interrupt handler
Jeff Garzik0cba6322005-05-30 19:49:12 -04005183 * @irq: irq line (unused)
Jeff Garzikcca39742006-08-24 03:19:22 -04005184 * @dev_instance: pointer to our ata_host information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07005185 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005186 * Default interrupt handler for PCI IDE devices. Calls
5187 * ata_host_intr() for each port that is not disabled.
5188 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005189 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04005190 * Obtains host lock during operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005191 *
5192 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005193 * IRQ_NONE or IRQ_HANDLED.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005194 */
5195
David Howells7d12e782006-10-05 14:55:46 +01005196irqreturn_t ata_interrupt (int irq, void *dev_instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005197{
Jeff Garzikcca39742006-08-24 03:19:22 -04005198 struct ata_host *host = dev_instance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005199 unsigned int i;
5200 unsigned int handled = 0;
5201 unsigned long flags;
5202
5203 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
Jeff Garzikcca39742006-08-24 03:19:22 -04005204 spin_lock_irqsave(&host->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005205
Jeff Garzikcca39742006-08-24 03:19:22 -04005206 for (i = 0; i < host->n_ports; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005207 struct ata_port *ap;
5208
Jeff Garzikcca39742006-08-24 03:19:22 -04005209 ap = host->ports[i];
Tejun Heoc1389502005-08-22 14:59:24 +09005210 if (ap &&
Jeff Garzik029f5462006-04-02 10:30:40 -04005211 !(ap->flags & ATA_FLAG_DISABLED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005212 struct ata_queued_cmd *qc;
5213
5214 qc = ata_qc_from_tag(ap, ap->active_tag);
Albert Lee312f7da2005-09-27 17:38:03 +08005215 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
Albert Lee21b1ed72005-04-29 17:34:59 +08005216 (qc->flags & ATA_QCFLAG_ACTIVE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005217 handled |= ata_host_intr(ap, qc);
5218 }
5219 }
5220
Jeff Garzikcca39742006-08-24 03:19:22 -04005221 spin_unlock_irqrestore(&host->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005222
5223 return IRQ_RETVAL(handled);
5224}
5225
Tejun Heo34bf2172006-05-15 20:57:46 +09005226/**
5227 * sata_scr_valid - test whether SCRs are accessible
5228 * @ap: ATA port to test SCR accessibility for
5229 *
5230 * Test whether SCRs are accessible for @ap.
5231 *
5232 * LOCKING:
5233 * None.
5234 *
5235 * RETURNS:
5236 * 1 if SCRs are accessible, 0 otherwise.
5237 */
5238int sata_scr_valid(struct ata_port *ap)
5239{
5240 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
5241}
5242
5243/**
5244 * sata_scr_read - read SCR register of the specified port
5245 * @ap: ATA port to read SCR for
5246 * @reg: SCR to read
5247 * @val: Place to store read value
5248 *
5249 * Read SCR register @reg of @ap into *@val. This function is
5250 * guaranteed to succeed if the cable type of the port is SATA
5251 * and the port implements ->scr_read.
5252 *
5253 * LOCKING:
5254 * None.
5255 *
5256 * RETURNS:
5257 * 0 on success, negative errno on failure.
5258 */
5259int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
5260{
5261 if (sata_scr_valid(ap)) {
5262 *val = ap->ops->scr_read(ap, reg);
5263 return 0;
5264 }
5265 return -EOPNOTSUPP;
5266}
5267
5268/**
5269 * sata_scr_write - write SCR register of the specified port
5270 * @ap: ATA port to write SCR for
5271 * @reg: SCR to write
5272 * @val: value to write
5273 *
5274 * Write @val to SCR register @reg of @ap. This function is
5275 * guaranteed to succeed if the cable type of the port is SATA
5276 * and the port implements ->scr_read.
5277 *
5278 * LOCKING:
5279 * None.
5280 *
5281 * RETURNS:
5282 * 0 on success, negative errno on failure.
5283 */
5284int sata_scr_write(struct ata_port *ap, int reg, u32 val)
5285{
5286 if (sata_scr_valid(ap)) {
5287 ap->ops->scr_write(ap, reg, val);
5288 return 0;
5289 }
5290 return -EOPNOTSUPP;
5291}
5292
5293/**
5294 * sata_scr_write_flush - write SCR register of the specified port and flush
5295 * @ap: ATA port to write SCR for
5296 * @reg: SCR to write
5297 * @val: value to write
5298 *
5299 * This function is identical to sata_scr_write() except that this
5300 * function performs flush after writing to the register.
5301 *
5302 * LOCKING:
5303 * None.
5304 *
5305 * RETURNS:
5306 * 0 on success, negative errno on failure.
5307 */
5308int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
5309{
5310 if (sata_scr_valid(ap)) {
5311 ap->ops->scr_write(ap, reg, val);
5312 ap->ops->scr_read(ap, reg);
5313 return 0;
5314 }
5315 return -EOPNOTSUPP;
5316}
5317
5318/**
5319 * ata_port_online - test whether the given port is online
5320 * @ap: ATA port to test
5321 *
5322 * Test whether @ap is online. Note that this function returns 0
5323 * if online status of @ap cannot be obtained, so
5324 * ata_port_online(ap) != !ata_port_offline(ap).
5325 *
5326 * LOCKING:
5327 * None.
5328 *
5329 * RETURNS:
5330 * 1 if the port online status is available and online.
5331 */
5332int ata_port_online(struct ata_port *ap)
5333{
5334 u32 sstatus;
5335
5336 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
5337 return 1;
5338 return 0;
5339}
5340
5341/**
5342 * ata_port_offline - test whether the given port is offline
5343 * @ap: ATA port to test
5344 *
5345 * Test whether @ap is offline. Note that this function returns
5346 * 0 if offline status of @ap cannot be obtained, so
5347 * ata_port_online(ap) != !ata_port_offline(ap).
5348 *
5349 * LOCKING:
5350 * None.
5351 *
5352 * RETURNS:
5353 * 1 if the port offline status is available and offline.
5354 */
5355int ata_port_offline(struct ata_port *ap)
5356{
5357 u32 sstatus;
5358
5359 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
5360 return 1;
5361 return 0;
5362}
Edward Falk0baab862005-06-02 18:17:13 -04005363
Tejun Heo77b08fb2006-06-24 20:30:19 +09005364int ata_flush_cache(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01005365{
Tejun Heo977e6b92006-06-24 20:30:19 +09005366 unsigned int err_mask;
Jens Axboe9b847542006-01-06 09:28:07 +01005367 u8 cmd;
5368
5369 if (!ata_try_flush_cache(dev))
5370 return 0;
5371
Tejun Heo6fc49ad2006-11-11 20:10:45 +09005372 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
Jens Axboe9b847542006-01-06 09:28:07 +01005373 cmd = ATA_CMD_FLUSH_EXT;
5374 else
5375 cmd = ATA_CMD_FLUSH;
5376
Tejun Heo977e6b92006-06-24 20:30:19 +09005377 err_mask = ata_do_simple_cmd(dev, cmd);
5378 if (err_mask) {
5379 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
5380 return -EIO;
5381 }
5382
5383 return 0;
Jens Axboe9b847542006-01-06 09:28:07 +01005384}
5385
Jeff Garzikcca39742006-08-24 03:19:22 -04005386static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5387 unsigned int action, unsigned int ehi_flags,
5388 int wait)
Tejun Heo500530f2006-07-03 16:07:27 +09005389{
5390 unsigned long flags;
5391 int i, rc;
5392
Jeff Garzikcca39742006-08-24 03:19:22 -04005393 for (i = 0; i < host->n_ports; i++) {
5394 struct ata_port *ap = host->ports[i];
Tejun Heo500530f2006-07-03 16:07:27 +09005395
5396 /* Previous resume operation might still be in
5397 * progress. Wait for PM_PENDING to clear.
5398 */
5399 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5400 ata_port_wait_eh(ap);
5401 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5402 }
5403
5404 /* request PM ops to EH */
5405 spin_lock_irqsave(ap->lock, flags);
5406
5407 ap->pm_mesg = mesg;
5408 if (wait) {
5409 rc = 0;
5410 ap->pm_result = &rc;
5411 }
5412
5413 ap->pflags |= ATA_PFLAG_PM_PENDING;
5414 ap->eh_info.action |= action;
5415 ap->eh_info.flags |= ehi_flags;
5416
5417 ata_port_schedule_eh(ap);
5418
5419 spin_unlock_irqrestore(ap->lock, flags);
5420
5421 /* wait and check result */
5422 if (wait) {
5423 ata_port_wait_eh(ap);
5424 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5425 if (rc)
5426 return rc;
5427 }
5428 }
5429
5430 return 0;
5431}
5432
5433/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005434 * ata_host_suspend - suspend host
5435 * @host: host to suspend
Tejun Heo500530f2006-07-03 16:07:27 +09005436 * @mesg: PM message
5437 *
Jeff Garzikcca39742006-08-24 03:19:22 -04005438 * Suspend @host. Actual operation is performed by EH. This
Tejun Heo500530f2006-07-03 16:07:27 +09005439 * function requests EH to perform PM operations and waits for EH
5440 * to finish.
5441 *
5442 * LOCKING:
5443 * Kernel thread context (may sleep).
5444 *
5445 * RETURNS:
5446 * 0 on success, -errno on failure.
5447 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005448int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
Tejun Heo500530f2006-07-03 16:07:27 +09005449{
5450 int i, j, rc;
5451
Jeff Garzikcca39742006-08-24 03:19:22 -04005452 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
Tejun Heo500530f2006-07-03 16:07:27 +09005453 if (rc)
5454 goto fail;
5455
5456 /* EH is quiescent now. Fail if we have any ready device.
5457 * This happens if hotplug occurs between completion of device
5458 * suspension and here.
5459 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005460 for (i = 0; i < host->n_ports; i++) {
5461 struct ata_port *ap = host->ports[i];
Tejun Heo500530f2006-07-03 16:07:27 +09005462
5463 for (j = 0; j < ATA_MAX_DEVICES; j++) {
5464 struct ata_device *dev = &ap->device[j];
5465
5466 if (ata_dev_ready(dev)) {
5467 ata_port_printk(ap, KERN_WARNING,
5468 "suspend failed, device %d "
5469 "still active\n", dev->devno);
5470 rc = -EBUSY;
5471 goto fail;
5472 }
5473 }
5474 }
5475
Jeff Garzikcca39742006-08-24 03:19:22 -04005476 host->dev->power.power_state = mesg;
Tejun Heo500530f2006-07-03 16:07:27 +09005477 return 0;
5478
5479 fail:
Jeff Garzikcca39742006-08-24 03:19:22 -04005480 ata_host_resume(host);
Tejun Heo500530f2006-07-03 16:07:27 +09005481 return rc;
5482}
5483
5484/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005485 * ata_host_resume - resume host
5486 * @host: host to resume
Tejun Heo500530f2006-07-03 16:07:27 +09005487 *
Jeff Garzikcca39742006-08-24 03:19:22 -04005488 * Resume @host. Actual operation is performed by EH. This
Tejun Heo500530f2006-07-03 16:07:27 +09005489 * function requests EH to perform PM operations and returns.
5490 * Note that all resume operations are performed parallely.
5491 *
5492 * LOCKING:
5493 * Kernel thread context (may sleep).
5494 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005495void ata_host_resume(struct ata_host *host)
Tejun Heo500530f2006-07-03 16:07:27 +09005496{
Jeff Garzikcca39742006-08-24 03:19:22 -04005497 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
5498 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5499 host->dev->power.power_state = PMSG_ON;
Tejun Heo500530f2006-07-03 16:07:27 +09005500}
5501
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005502/**
5503 * ata_port_start - Set port up for dma.
5504 * @ap: Port to initialize
5505 *
5506 * Called just after data structures for each port are
5507 * initialized. Allocates space for PRD table.
5508 *
5509 * May be used as the port_start() entry in ata_port_operations.
5510 *
5511 * LOCKING:
5512 * Inherited from caller.
5513 */
5514
Linus Torvalds1da177e2005-04-16 15:20:36 -07005515int ata_port_start (struct ata_port *ap)
5516{
Brian King2f1f6102006-03-23 17:30:15 -06005517 struct device *dev = ap->dev;
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005518 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005519
5520 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
5521 if (!ap->prd)
5522 return -ENOMEM;
5523
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005524 rc = ata_pad_alloc(ap, dev);
5525 if (rc) {
Jeff Garzikcedc9a42005-10-05 07:13:30 -04005526 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005527 return rc;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04005528 }
5529
Linus Torvalds1da177e2005-04-16 15:20:36 -07005530 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
5531
5532 return 0;
5533}
5534
Edward Falk0baab862005-06-02 18:17:13 -04005535
5536/**
5537 * ata_port_stop - Undo ata_port_start()
5538 * @ap: Port to shut down
5539 *
5540 * Frees the PRD table.
5541 *
5542 * May be used as the port_stop() entry in ata_port_operations.
5543 *
5544 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04005545 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04005546 */
5547
Linus Torvalds1da177e2005-04-16 15:20:36 -07005548void ata_port_stop (struct ata_port *ap)
5549{
Brian King2f1f6102006-03-23 17:30:15 -06005550 struct device *dev = ap->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005551
5552 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005553 ata_pad_free(ap, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005554}
5555
Jeff Garzikcca39742006-08-24 03:19:22 -04005556void ata_host_stop (struct ata_host *host)
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04005557{
Jeff Garzikcca39742006-08-24 03:19:22 -04005558 if (host->mmio_base)
5559 iounmap(host->mmio_base);
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04005560}
5561
Linus Torvalds1da177e2005-04-16 15:20:36 -07005562/**
Tejun Heo3ef3b432006-05-31 18:27:30 +09005563 * ata_dev_init - Initialize an ata_device structure
5564 * @dev: Device structure to initialize
5565 *
5566 * Initialize @dev in preparation for probing.
5567 *
5568 * LOCKING:
5569 * Inherited from caller.
5570 */
5571void ata_dev_init(struct ata_device *dev)
5572{
5573 struct ata_port *ap = dev->ap;
Tejun Heo72fa4b72006-05-31 18:27:32 +09005574 unsigned long flags;
Tejun Heo3ef3b432006-05-31 18:27:30 +09005575
Tejun Heo5a04bf42006-05-31 18:27:38 +09005576 /* SATA spd limit is bound to the first device */
5577 ap->sata_spd_limit = ap->hw_sata_spd_limit;
5578
Tejun Heo72fa4b72006-05-31 18:27:32 +09005579 /* High bits of dev->flags are used to record warm plug
5580 * requests which occur asynchronously. Synchronize using
Jeff Garzikcca39742006-08-24 03:19:22 -04005581 * host lock.
Tejun Heo72fa4b72006-05-31 18:27:32 +09005582 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005583 spin_lock_irqsave(ap->lock, flags);
Tejun Heo72fa4b72006-05-31 18:27:32 +09005584 dev->flags &= ~ATA_DFLAG_INIT_MASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04005585 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo72fa4b72006-05-31 18:27:32 +09005586
5587 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5588 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
Tejun Heo3ef3b432006-05-31 18:27:30 +09005589 dev->pio_mask = UINT_MAX;
5590 dev->mwdma_mask = UINT_MAX;
5591 dev->udma_mask = UINT_MAX;
5592}
5593
5594/**
Brian King155a8a92006-08-07 14:27:17 -05005595 * ata_port_init - Initialize an ata_port structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07005596 * @ap: Structure to initialize
Jeff Garzikcca39742006-08-24 03:19:22 -04005597 * @host: Collection of hosts to which @ap belongs
Linus Torvalds1da177e2005-04-16 15:20:36 -07005598 * @ent: Probe information provided by low-level driver
5599 * @port_no: Port number associated with this ata_port
5600 *
Brian King155a8a92006-08-07 14:27:17 -05005601 * Initialize a new ata_port structure.
Jeff Garzik0cba6322005-05-30 19:49:12 -04005602 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005603 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005604 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005605 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005606void ata_port_init(struct ata_port *ap, struct ata_host *host,
Brian King155a8a92006-08-07 14:27:17 -05005607 const struct ata_probe_ent *ent, unsigned int port_no)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005608{
5609 unsigned int i;
5610
Jeff Garzikcca39742006-08-24 03:19:22 -04005611 ap->lock = &host->lock;
Tejun Heo198e0fe2006-04-02 18:51:52 +09005612 ap->flags = ATA_FLAG_DISABLED;
Brian King155a8a92006-08-07 14:27:17 -05005613 ap->id = ata_unique_id++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005614 ap->ctl = ATA_DEVCTL_OBS;
Jeff Garzikcca39742006-08-24 03:19:22 -04005615 ap->host = host;
Brian King2f1f6102006-03-23 17:30:15 -06005616 ap->dev = ent->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005617 ap->port_no = port_no;
Tejun Heofea63e32006-09-16 03:04:15 +09005618 if (port_no == 1 && ent->pinfo2) {
5619 ap->pio_mask = ent->pinfo2->pio_mask;
5620 ap->mwdma_mask = ent->pinfo2->mwdma_mask;
5621 ap->udma_mask = ent->pinfo2->udma_mask;
5622 ap->flags |= ent->pinfo2->flags;
5623 ap->ops = ent->pinfo2->port_ops;
5624 } else {
5625 ap->pio_mask = ent->pio_mask;
5626 ap->mwdma_mask = ent->mwdma_mask;
5627 ap->udma_mask = ent->udma_mask;
5628 ap->flags |= ent->port_flags;
5629 ap->ops = ent->port_ops;
5630 }
Tejun Heo5a04bf42006-05-31 18:27:38 +09005631 ap->hw_sata_spd_limit = UINT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005632 ap->active_tag = ATA_TAG_POISON;
5633 ap->last_ctl = 0xFF;
Borislav Petkovbd5d8252006-06-11 23:17:01 -04005634
5635#if defined(ATA_VERBOSE_DEBUG)
5636 /* turn on all debugging levels */
5637 ap->msg_enable = 0x00FF;
5638#elif defined(ATA_DEBUG)
5639 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
Tejun Heo88574552006-06-25 20:00:35 +09005640#else
Borislav Petkov0dd4b212006-06-23 02:29:08 -04005641 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
Borislav Petkovbd5d8252006-06-11 23:17:01 -04005642#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07005643
David Howells65f27f32006-11-22 14:55:48 +00005644 INIT_DELAYED_WORK(&ap->port_task, NULL);
5645 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5646 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09005647 INIT_LIST_HEAD(&ap->eh_done_q);
Tejun Heoc6cf9e92006-05-31 18:27:27 +09005648 init_waitqueue_head(&ap->eh_wait_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005649
Tejun Heo838df622006-05-15 20:57:44 +09005650 /* set cable type */
5651 ap->cbl = ATA_CBL_NONE;
5652 if (ap->flags & ATA_FLAG_SATA)
5653 ap->cbl = ATA_CBL_SATA;
5654
Tejun Heoacf356b2006-03-24 14:07:50 +09005655 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5656 struct ata_device *dev = &ap->device[i];
Tejun Heo38d87232006-05-15 20:57:51 +09005657 dev->ap = ap;
Tejun Heo72fa4b72006-05-31 18:27:32 +09005658 dev->devno = i;
Tejun Heo3ef3b432006-05-31 18:27:30 +09005659 ata_dev_init(dev);
Tejun Heoacf356b2006-03-24 14:07:50 +09005660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005661
5662#ifdef ATA_IRQ_TRAP
5663 ap->stats.unhandled_irq = 1;
5664 ap->stats.idle_irq = 1;
5665#endif
5666
5667 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
5668}
5669
5670/**
Tejun Heo4608c162006-08-10 16:59:01 +09005671 * ata_port_init_shost - Initialize SCSI host associated with ATA port
5672 * @ap: ATA port to initialize SCSI host for
5673 * @shost: SCSI host associated with @ap
Brian King155a8a92006-08-07 14:27:17 -05005674 *
Tejun Heo4608c162006-08-10 16:59:01 +09005675 * Initialize SCSI host @shost associated with ATA port @ap.
Brian King155a8a92006-08-07 14:27:17 -05005676 *
5677 * LOCKING:
5678 * Inherited from caller.
5679 */
Tejun Heo4608c162006-08-10 16:59:01 +09005680static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
Brian King155a8a92006-08-07 14:27:17 -05005681{
Jeff Garzikcca39742006-08-24 03:19:22 -04005682 ap->scsi_host = shost;
Brian King155a8a92006-08-07 14:27:17 -05005683
Tejun Heo4608c162006-08-10 16:59:01 +09005684 shost->unique_id = ap->id;
5685 shost->max_id = 16;
5686 shost->max_lun = 1;
5687 shost->max_channel = 1;
5688 shost->max_cmd_len = 12;
Brian King155a8a92006-08-07 14:27:17 -05005689}
5690
5691/**
Jeff Garzik996139f2006-08-10 16:59:03 +09005692 * ata_port_add - Attach low-level ATA driver to system
Linus Torvalds1da177e2005-04-16 15:20:36 -07005693 * @ent: Information provided by low-level driver
Jeff Garzikcca39742006-08-24 03:19:22 -04005694 * @host: Collections of ports to which we add
Linus Torvalds1da177e2005-04-16 15:20:36 -07005695 * @port_no: Port number associated with this host
5696 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005697 * Attach low-level ATA driver to system.
5698 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005699 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005700 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005701 *
5702 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005703 * New ata_port on success, for NULL on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005704 */
Jeff Garzik996139f2006-08-10 16:59:03 +09005705static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
Jeff Garzikcca39742006-08-24 03:19:22 -04005706 struct ata_host *host,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005707 unsigned int port_no)
5708{
Jeff Garzik996139f2006-08-10 16:59:03 +09005709 struct Scsi_Host *shost;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005710 struct ata_port *ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005711
5712 DPRINTK("ENTER\n");
Tejun Heoaec5c3c2006-03-25 01:33:34 +09005713
Tejun Heo52783c52006-05-31 18:28:22 +09005714 if (!ent->port_ops->error_handler &&
Jeff Garzikcca39742006-08-24 03:19:22 -04005715 !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
Tejun Heoaec5c3c2006-03-25 01:33:34 +09005716 printk(KERN_ERR "ata%u: no reset mechanism available\n",
5717 port_no);
5718 return NULL;
5719 }
5720
Jeff Garzik996139f2006-08-10 16:59:03 +09005721 shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
5722 if (!shost)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005723 return NULL;
5724
Jeff Garzik996139f2006-08-10 16:59:03 +09005725 shost->transportt = &ata_scsi_transport_template;
Tejun Heo30afc842006-03-18 18:40:14 +09005726
Jeff Garzik996139f2006-08-10 16:59:03 +09005727 ap = ata_shost_to_port(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005728
Jeff Garzikcca39742006-08-24 03:19:22 -04005729 ata_port_init(ap, host, ent, port_no);
Jeff Garzik996139f2006-08-10 16:59:03 +09005730 ata_port_init_shost(ap, shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005731
Linus Torvalds1da177e2005-04-16 15:20:36 -07005732 return ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005733}
5734
5735/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005736 * ata_sas_host_init - Initialize a host struct
5737 * @host: host to initialize
5738 * @dev: device host is attached to
5739 * @flags: host flags
5740 * @ops: port_ops
Brian Kingb03732f2006-08-07 14:27:10 -05005741 *
5742 * LOCKING:
5743 * PCI/etc. bus probe sem.
5744 *
5745 */
5746
Jeff Garzikcca39742006-08-24 03:19:22 -04005747void ata_host_init(struct ata_host *host, struct device *dev,
5748 unsigned long flags, const struct ata_port_operations *ops)
Brian Kingb03732f2006-08-07 14:27:10 -05005749{
Jeff Garzikcca39742006-08-24 03:19:22 -04005750 spin_lock_init(&host->lock);
5751 host->dev = dev;
5752 host->flags = flags;
5753 host->ops = ops;
Brian Kingb03732f2006-08-07 14:27:10 -05005754}
5755
5756/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04005757 * ata_device_add - Register hardware device with ATA and SCSI layers
5758 * @ent: Probe information describing hardware device to be registered
5759 *
5760 * This function processes the information provided in the probe
5761 * information struct @ent, allocates the necessary ATA and SCSI
5762 * host information structures, initializes them, and registers
5763 * everything with requisite kernel subsystems.
5764 *
5765 * This function requests irqs, probes the ATA bus, and probes
5766 * the SCSI bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005767 *
5768 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005769 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005770 *
5771 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005772 * Number of ports registered. Zero on error (no ports registered).
Linus Torvalds1da177e2005-04-16 15:20:36 -07005773 */
Jeff Garzik057ace52005-10-22 14:27:05 -04005774int ata_device_add(const struct ata_probe_ent *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005775{
Jeff Garzik6d0500d2006-08-10 16:59:05 +09005776 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005777 struct device *dev = ent->dev;
Jeff Garzikcca39742006-08-24 03:19:22 -04005778 struct ata_host *host;
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005779 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005780
5781 DPRINTK("ENTER\n");
Alan Cox02f076a2006-09-26 17:35:32 +01005782
5783 if (ent->irq == 0) {
5784 dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
5785 return 0;
5786 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005787 /* alloc a container for our list of ATA ports (buses) */
Jeff Garzikcca39742006-08-24 03:19:22 -04005788 host = kzalloc(sizeof(struct ata_host) +
5789 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
5790 if (!host)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005791 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005792
Jeff Garzikcca39742006-08-24 03:19:22 -04005793 ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
5794 host->n_ports = ent->n_ports;
5795 host->irq = ent->irq;
5796 host->irq2 = ent->irq2;
5797 host->mmio_base = ent->mmio_base;
5798 host->private_data = ent->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005799
5800 /* register each port bound to this device */
Jeff Garzikcca39742006-08-24 03:19:22 -04005801 for (i = 0; i < host->n_ports; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005802 struct ata_port *ap;
5803 unsigned long xfer_mode_mask;
Alan Cox2ec7df02006-08-10 16:59:10 +09005804 int irq_line = ent->irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005805
Jeff Garzikcca39742006-08-24 03:19:22 -04005806 ap = ata_port_add(ent, host, i);
Dave Jonesc38778c2006-09-26 23:52:50 -07005807 host->ports[i] = ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005808 if (!ap)
5809 goto err_out;
5810
Tejun Heodd5b06c2006-08-10 16:59:12 +09005811 /* dummy? */
5812 if (ent->dummy_port_mask & (1 << i)) {
5813 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5814 ap->ops = &ata_dummy_port_ops;
5815 continue;
5816 }
5817
5818 /* start port */
5819 rc = ap->ops->port_start(ap);
5820 if (rc) {
Jeff Garzikcca39742006-08-24 03:19:22 -04005821 host->ports[i] = NULL;
5822 scsi_host_put(ap->scsi_host);
Tejun Heodd5b06c2006-08-10 16:59:12 +09005823 goto err_out;
5824 }
5825
Alan Cox2ec7df02006-08-10 16:59:10 +09005826 /* Report the secondary IRQ for second channel legacy */
5827 if (i == 1 && ent->irq2)
5828 irq_line = ent->irq2;
5829
Linus Torvalds1da177e2005-04-16 15:20:36 -07005830 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
5831 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
5832 (ap->pio_mask << ATA_SHIFT_PIO);
5833
5834 /* print per-port info to dmesg */
Tejun Heof15a1da2006-05-15 20:57:56 +09005835 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
Alan Cox2ec7df02006-08-10 16:59:10 +09005836 "ctl 0x%lX bmdma 0x%lX irq %d\n",
Tejun Heof15a1da2006-05-15 20:57:56 +09005837 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
5838 ata_mode_string(xfer_mode_mask),
5839 ap->ioaddr.cmd_addr,
5840 ap->ioaddr.ctl_addr,
5841 ap->ioaddr.bmdma_addr,
Alan Cox2ec7df02006-08-10 16:59:10 +09005842 irq_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005843
Tejun Heo0f0a3ad2006-11-17 12:24:22 +09005844 /* freeze port before requesting IRQ */
5845 ata_eh_freeze_port(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005846 }
5847
Alan Cox2ec7df02006-08-10 16:59:10 +09005848 /* obtain irq, that may be shared between channels */
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005849 rc = request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
Jeff Garzikcca39742006-08-24 03:19:22 -04005850 DRV_NAME, host);
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005851 if (rc) {
5852 dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
5853 ent->irq, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005854 goto err_out;
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005855 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005856
Alan Cox2ec7df02006-08-10 16:59:10 +09005857 /* do we have a second IRQ for the other channel, eg legacy mode */
5858 if (ent->irq2) {
5859 /* We will get weird core code crashes later if this is true
5860 so trap it now */
5861 BUG_ON(ent->irq == ent->irq2);
5862
5863 rc = request_irq(ent->irq2, ent->port_ops->irq_handler, ent->irq_flags,
Jeff Garzikcca39742006-08-24 03:19:22 -04005864 DRV_NAME, host);
Alan Cox2ec7df02006-08-10 16:59:10 +09005865 if (rc) {
5866 dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
5867 ent->irq2, rc);
5868 goto err_out_free_irq;
5869 }
5870 }
5871
Linus Torvalds1da177e2005-04-16 15:20:36 -07005872 /* perform each probe synchronously */
5873 DPRINTK("probe begin\n");
Jeff Garzikcca39742006-08-24 03:19:22 -04005874 for (i = 0; i < host->n_ports; i++) {
5875 struct ata_port *ap = host->ports[i];
Tejun Heo5a04bf42006-05-31 18:27:38 +09005876 u32 scontrol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005877 int rc;
5878
Tejun Heo5a04bf42006-05-31 18:27:38 +09005879 /* init sata_spd_limit to the current value */
5880 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
5881 int spd = (scontrol >> 4) & 0xf;
5882 ap->hw_sata_spd_limit &= (1 << spd) - 1;
5883 }
5884 ap->sata_spd_limit = ap->hw_sata_spd_limit;
5885
Jeff Garzikcca39742006-08-24 03:19:22 -04005886 rc = scsi_add_host(ap->scsi_host, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005887 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09005888 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005889 /* FIXME: do something useful here */
5890 /* FIXME: handle unconditional calls to
5891 * scsi_scan_host and ata_host_remove, below,
5892 * at the very least
5893 */
5894 }
Tejun Heo3e706392006-05-31 18:28:11 +09005895
Tejun Heo52783c52006-05-31 18:28:22 +09005896 if (ap->ops->error_handler) {
Tejun Heo1cdaf532006-07-03 16:07:26 +09005897 struct ata_eh_info *ehi = &ap->eh_info;
Tejun Heo3e706392006-05-31 18:28:11 +09005898 unsigned long flags;
5899
5900 ata_port_probe(ap);
5901
5902 /* kick EH for boot probing */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005903 spin_lock_irqsave(ap->lock, flags);
Tejun Heo3e706392006-05-31 18:28:11 +09005904
Tejun Heo1cdaf532006-07-03 16:07:26 +09005905 ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
5906 ehi->action |= ATA_EH_SOFTRESET;
5907 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
Tejun Heo3e706392006-05-31 18:28:11 +09005908
Tejun Heob51e9e52006-06-29 01:29:30 +09005909 ap->pflags |= ATA_PFLAG_LOADING;
Tejun Heo3e706392006-05-31 18:28:11 +09005910 ata_port_schedule_eh(ap);
5911
Jeff Garzikba6a1302006-06-22 23:46:10 -04005912 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo3e706392006-05-31 18:28:11 +09005913
5914 /* wait for EH to finish */
5915 ata_port_wait_eh(ap);
5916 } else {
5917 DPRINTK("ata%u: bus probe begin\n", ap->id);
5918 rc = ata_bus_probe(ap);
5919 DPRINTK("ata%u: bus probe end\n", ap->id);
5920
5921 if (rc) {
5922 /* FIXME: do something useful here?
5923 * Current libata behavior will
5924 * tear down everything when
5925 * the module is removed
5926 * or the h/w is unplugged.
5927 */
5928 }
5929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005930 }
5931
5932 /* probes are done, now scan each port's disk(s) */
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005933 DPRINTK("host probe begin\n");
Jeff Garzikcca39742006-08-24 03:19:22 -04005934 for (i = 0; i < host->n_ports; i++) {
5935 struct ata_port *ap = host->ports[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07005936
Jeff Garzik644dd0c2005-10-03 15:55:19 -04005937 ata_scsi_scan_host(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005938 }
5939
Jeff Garzikcca39742006-08-24 03:19:22 -04005940 dev_set_drvdata(dev, host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005941
5942 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5943 return ent->n_ports; /* success */
5944
Alan Cox2ec7df02006-08-10 16:59:10 +09005945err_out_free_irq:
Jeff Garzikcca39742006-08-24 03:19:22 -04005946 free_irq(ent->irq, host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005947err_out:
Jeff Garzikcca39742006-08-24 03:19:22 -04005948 for (i = 0; i < host->n_ports; i++) {
5949 struct ata_port *ap = host->ports[i];
Tejun Heo77f3f872006-08-05 03:59:19 +09005950 if (ap) {
5951 ap->ops->port_stop(ap);
Jeff Garzikcca39742006-08-24 03:19:22 -04005952 scsi_host_put(ap->scsi_host);
Tejun Heo77f3f872006-08-05 03:59:19 +09005953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005954 }
Jeff Garzik6d0500d2006-08-10 16:59:05 +09005955
Jeff Garzikcca39742006-08-24 03:19:22 -04005956 kfree(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005957 VPRINTK("EXIT, returning 0\n");
5958 return 0;
5959}
5960
5961/**
Tejun Heo720ba122006-05-31 18:28:13 +09005962 * ata_port_detach - Detach ATA port in prepration of device removal
5963 * @ap: ATA port to be detached
5964 *
5965 * Detach all ATA devices and the associated SCSI devices of @ap;
5966 * then, remove the associated SCSI host. @ap is guaranteed to
5967 * be quiescent on return from this function.
5968 *
5969 * LOCKING:
5970 * Kernel thread context (may sleep).
5971 */
5972void ata_port_detach(struct ata_port *ap)
5973{
5974 unsigned long flags;
5975 int i;
5976
5977 if (!ap->ops->error_handler)
Tejun Heoc3cf30a2006-08-05 03:59:11 +09005978 goto skip_eh;
Tejun Heo720ba122006-05-31 18:28:13 +09005979
5980 /* tell EH we're leaving & flush EH */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005981 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09005982 ap->pflags |= ATA_PFLAG_UNLOADING;
Jeff Garzikba6a1302006-06-22 23:46:10 -04005983 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005984
5985 ata_port_wait_eh(ap);
5986
5987 /* EH is now guaranteed to see UNLOADING, so no new device
5988 * will be attached. Disable all existing devices.
5989 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005990 spin_lock_irqsave(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005991
5992 for (i = 0; i < ATA_MAX_DEVICES; i++)
5993 ata_dev_disable(&ap->device[i]);
5994
Jeff Garzikba6a1302006-06-22 23:46:10 -04005995 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005996
5997 /* Final freeze & EH. All in-flight commands are aborted. EH
5998 * will be skipped and retrials will be terminated with bad
5999 * target.
6000 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04006001 spin_lock_irqsave(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09006002 ata_port_freeze(ap); /* won't be thawed */
Jeff Garzikba6a1302006-06-22 23:46:10 -04006003 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09006004
6005 ata_port_wait_eh(ap);
6006
6007 /* Flush hotplug task. The sequence is similar to
6008 * ata_port_flush_task().
6009 */
6010 flush_workqueue(ata_aux_wq);
6011 cancel_delayed_work(&ap->hotplug_task);
6012 flush_workqueue(ata_aux_wq);
6013
Tejun Heoc3cf30a2006-08-05 03:59:11 +09006014 skip_eh:
Tejun Heo720ba122006-05-31 18:28:13 +09006015 /* remove the associated SCSI host */
Jeff Garzikcca39742006-08-24 03:19:22 -04006016 scsi_remove_host(ap->scsi_host);
Tejun Heo720ba122006-05-31 18:28:13 +09006017}
6018
6019/**
Jeff Garzikcca39742006-08-24 03:19:22 -04006020 * ata_host_remove - PCI layer callback for device removal
6021 * @host: ATA host set that was removed
Alan Cox17b14452005-09-15 15:44:00 +01006022 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05006023 * Unregister all objects associated with this host set. Free those
Alan Cox17b14452005-09-15 15:44:00 +01006024 * objects.
6025 *
6026 * LOCKING:
6027 * Inherited from calling layer (may sleep).
6028 */
6029
Jeff Garzikcca39742006-08-24 03:19:22 -04006030void ata_host_remove(struct ata_host *host)
Alan Cox17b14452005-09-15 15:44:00 +01006031{
Alan Cox17b14452005-09-15 15:44:00 +01006032 unsigned int i;
6033
Jeff Garzikcca39742006-08-24 03:19:22 -04006034 for (i = 0; i < host->n_ports; i++)
6035 ata_port_detach(host->ports[i]);
Alan Cox17b14452005-09-15 15:44:00 +01006036
Jeff Garzikcca39742006-08-24 03:19:22 -04006037 free_irq(host->irq, host);
6038 if (host->irq2)
6039 free_irq(host->irq2, host);
Alan Cox17b14452005-09-15 15:44:00 +01006040
Jeff Garzikcca39742006-08-24 03:19:22 -04006041 for (i = 0; i < host->n_ports; i++) {
6042 struct ata_port *ap = host->ports[i];
Alan Cox17b14452005-09-15 15:44:00 +01006043
Jeff Garzikcca39742006-08-24 03:19:22 -04006044 ata_scsi_release(ap->scsi_host);
Alan Cox17b14452005-09-15 15:44:00 +01006045
6046 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
6047 struct ata_ioports *ioaddr = &ap->ioaddr;
6048
Alan Cox2ec7df02006-08-10 16:59:10 +09006049 /* FIXME: Add -ac IDE pci mods to remove these special cases */
6050 if (ioaddr->cmd_addr == ATA_PRIMARY_CMD)
6051 release_region(ATA_PRIMARY_CMD, 8);
6052 else if (ioaddr->cmd_addr == ATA_SECONDARY_CMD)
6053 release_region(ATA_SECONDARY_CMD, 8);
Alan Cox17b14452005-09-15 15:44:00 +01006054 }
6055
Jeff Garzikcca39742006-08-24 03:19:22 -04006056 scsi_host_put(ap->scsi_host);
Alan Cox17b14452005-09-15 15:44:00 +01006057 }
6058
Jeff Garzikcca39742006-08-24 03:19:22 -04006059 if (host->ops->host_stop)
6060 host->ops->host_stop(host);
Alan Cox17b14452005-09-15 15:44:00 +01006061
Jeff Garzikcca39742006-08-24 03:19:22 -04006062 kfree(host);
Alan Cox17b14452005-09-15 15:44:00 +01006063}
6064
6065/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07006066 * ata_scsi_release - SCSI layer callback hook for host unload
Jeff Garzik4f931372006-09-29 05:07:25 -04006067 * @shost: libata host to be unloaded
Linus Torvalds1da177e2005-04-16 15:20:36 -07006068 *
6069 * Performs all duties necessary to shut down a libata port...
6070 * Kill port kthread, disable port, and release resources.
6071 *
6072 * LOCKING:
6073 * Inherited from SCSI layer.
6074 *
6075 * RETURNS:
6076 * One.
6077 */
6078
Jeff Garzikcca39742006-08-24 03:19:22 -04006079int ata_scsi_release(struct Scsi_Host *shost)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006080{
Jeff Garzikcca39742006-08-24 03:19:22 -04006081 struct ata_port *ap = ata_shost_to_port(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006082
6083 DPRINTK("ENTER\n");
6084
6085 ap->ops->port_disable(ap);
Jeff Garzik6543bc02006-08-05 03:59:17 +09006086 ap->ops->port_stop(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006087
6088 DPRINTK("EXIT\n");
6089 return 1;
6090}
6091
Brian Kingf6d950e2006-08-07 14:27:24 -05006092struct ata_probe_ent *
6093ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
6094{
6095 struct ata_probe_ent *probe_ent;
6096
6097 probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
6098 if (!probe_ent) {
6099 printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
6100 kobject_name(&(dev->kobj)));
6101 return NULL;
6102 }
6103
6104 INIT_LIST_HEAD(&probe_ent->node);
6105 probe_ent->dev = dev;
6106
6107 probe_ent->sht = port->sht;
Jeff Garzikcca39742006-08-24 03:19:22 -04006108 probe_ent->port_flags = port->flags;
Brian Kingf6d950e2006-08-07 14:27:24 -05006109 probe_ent->pio_mask = port->pio_mask;
6110 probe_ent->mwdma_mask = port->mwdma_mask;
6111 probe_ent->udma_mask = port->udma_mask;
6112 probe_ent->port_ops = port->port_ops;
Jeff Garzikd639ca92006-09-28 03:48:18 -04006113 probe_ent->private_data = port->private_data;
Brian Kingf6d950e2006-08-07 14:27:24 -05006114
6115 return probe_ent;
6116}
6117
Linus Torvalds1da177e2005-04-16 15:20:36 -07006118/**
6119 * ata_std_ports - initialize ioaddr with standard port offsets.
6120 * @ioaddr: IO address structure to be initialized
Edward Falk0baab862005-06-02 18:17:13 -04006121 *
6122 * Utility function which initializes data_addr, error_addr,
6123 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
6124 * device_addr, status_addr, and command_addr to standard offsets
6125 * relative to cmd_addr.
6126 *
6127 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006128 */
Edward Falk0baab862005-06-02 18:17:13 -04006129
Linus Torvalds1da177e2005-04-16 15:20:36 -07006130void ata_std_ports(struct ata_ioports *ioaddr)
6131{
6132 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
6133 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
6134 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
6135 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
6136 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
6137 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
6138 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
6139 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
6140 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
6141 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
6142}
6143
Edward Falk0baab862005-06-02 18:17:13 -04006144
Jeff Garzik374b1872005-08-30 05:42:52 -04006145#ifdef CONFIG_PCI
6146
Jeff Garzikcca39742006-08-24 03:19:22 -04006147void ata_pci_host_stop (struct ata_host *host)
Jeff Garzik374b1872005-08-30 05:42:52 -04006148{
Jeff Garzikcca39742006-08-24 03:19:22 -04006149 struct pci_dev *pdev = to_pci_dev(host->dev);
Jeff Garzik374b1872005-08-30 05:42:52 -04006150
Jeff Garzikcca39742006-08-24 03:19:22 -04006151 pci_iounmap(pdev, host->mmio_base);
Jeff Garzik374b1872005-08-30 05:42:52 -04006152}
6153
Edward Falk0baab862005-06-02 18:17:13 -04006154/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07006155 * ata_pci_remove_one - PCI layer callback for device removal
6156 * @pdev: PCI device that was removed
6157 *
6158 * PCI layer indicates to libata via this hook that
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04006159 * hot-unplug or module unload event has occurred.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006160 * Handle this by unregistering all objects associated
6161 * with this PCI device. Free those objects. Then finally
6162 * release PCI resources and disable device.
6163 *
6164 * LOCKING:
6165 * Inherited from PCI layer (may sleep).
6166 */
6167
6168void ata_pci_remove_one (struct pci_dev *pdev)
6169{
6170 struct device *dev = pci_dev_to_dev(pdev);
Jeff Garzikcca39742006-08-24 03:19:22 -04006171 struct ata_host *host = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006172
Jeff Garzikcca39742006-08-24 03:19:22 -04006173 ata_host_remove(host);
Tejun Heof0eb62b2006-06-12 23:05:38 +09006174
Linus Torvalds1da177e2005-04-16 15:20:36 -07006175 pci_release_regions(pdev);
6176 pci_disable_device(pdev);
6177 dev_set_drvdata(dev, NULL);
6178}
6179
6180/* move to PCI subsystem */
Jeff Garzik057ace52005-10-22 14:27:05 -04006181int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006182{
6183 unsigned long tmp = 0;
6184
6185 switch (bits->width) {
6186 case 1: {
6187 u8 tmp8 = 0;
6188 pci_read_config_byte(pdev, bits->reg, &tmp8);
6189 tmp = tmp8;
6190 break;
6191 }
6192 case 2: {
6193 u16 tmp16 = 0;
6194 pci_read_config_word(pdev, bits->reg, &tmp16);
6195 tmp = tmp16;
6196 break;
6197 }
6198 case 4: {
6199 u32 tmp32 = 0;
6200 pci_read_config_dword(pdev, bits->reg, &tmp32);
6201 tmp = tmp32;
6202 break;
6203 }
6204
6205 default:
6206 return -EINVAL;
6207 }
6208
6209 tmp &= bits->mask;
6210
6211 return (tmp == bits->val) ? 1 : 0;
6212}
Jens Axboe9b847542006-01-06 09:28:07 +01006213
Tejun Heo3c5100c2006-07-26 16:58:33 +09006214void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
Jens Axboe9b847542006-01-06 09:28:07 +01006215{
6216 pci_save_state(pdev);
Tejun Heo500530f2006-07-03 16:07:27 +09006217
Tejun Heo3c5100c2006-07-26 16:58:33 +09006218 if (mesg.event == PM_EVENT_SUSPEND) {
Tejun Heo500530f2006-07-03 16:07:27 +09006219 pci_disable_device(pdev);
6220 pci_set_power_state(pdev, PCI_D3hot);
6221 }
Jens Axboe9b847542006-01-06 09:28:07 +01006222}
6223
Tejun Heo500530f2006-07-03 16:07:27 +09006224void ata_pci_device_do_resume(struct pci_dev *pdev)
Jens Axboe9b847542006-01-06 09:28:07 +01006225{
6226 pci_set_power_state(pdev, PCI_D0);
6227 pci_restore_state(pdev);
6228 pci_enable_device(pdev);
6229 pci_set_master(pdev);
Tejun Heo500530f2006-07-03 16:07:27 +09006230}
6231
Tejun Heo3c5100c2006-07-26 16:58:33 +09006232int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
Tejun Heo500530f2006-07-03 16:07:27 +09006233{
Jeff Garzikcca39742006-08-24 03:19:22 -04006234 struct ata_host *host = dev_get_drvdata(&pdev->dev);
Tejun Heo500530f2006-07-03 16:07:27 +09006235 int rc = 0;
6236
Jeff Garzikcca39742006-08-24 03:19:22 -04006237 rc = ata_host_suspend(host, mesg);
Tejun Heo500530f2006-07-03 16:07:27 +09006238 if (rc)
6239 return rc;
6240
Tejun Heo3c5100c2006-07-26 16:58:33 +09006241 ata_pci_device_do_suspend(pdev, mesg);
Tejun Heo500530f2006-07-03 16:07:27 +09006242
6243 return 0;
6244}
6245
6246int ata_pci_device_resume(struct pci_dev *pdev)
6247{
Jeff Garzikcca39742006-08-24 03:19:22 -04006248 struct ata_host *host = dev_get_drvdata(&pdev->dev);
Tejun Heo500530f2006-07-03 16:07:27 +09006249
6250 ata_pci_device_do_resume(pdev);
Jeff Garzikcca39742006-08-24 03:19:22 -04006251 ata_host_resume(host);
Jens Axboe9b847542006-01-06 09:28:07 +01006252 return 0;
6253}
Linus Torvalds1da177e2005-04-16 15:20:36 -07006254#endif /* CONFIG_PCI */
6255
6256
Linus Torvalds1da177e2005-04-16 15:20:36 -07006257static int __init ata_init(void)
6258{
Andrew Mortona8601e52006-06-25 01:36:52 -07006259 ata_probe_timeout *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006260 ata_wq = create_workqueue("ata");
6261 if (!ata_wq)
6262 return -ENOMEM;
6263
Tejun Heo453b07a2006-05-31 18:27:42 +09006264 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6265 if (!ata_aux_wq) {
6266 destroy_workqueue(ata_wq);
6267 return -ENOMEM;
6268 }
6269
Linus Torvalds1da177e2005-04-16 15:20:36 -07006270 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6271 return 0;
6272}
6273
6274static void __exit ata_exit(void)
6275{
6276 destroy_workqueue(ata_wq);
Tejun Heo453b07a2006-05-31 18:27:42 +09006277 destroy_workqueue(ata_aux_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006278}
6279
Brian Kinga4625082006-11-13 16:32:36 -06006280subsys_initcall(ata_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006281module_exit(ata_exit);
6282
Jeff Garzik67846b32005-10-05 02:58:32 -04006283static unsigned long ratelimit_time;
Ingo Molnar34af9462006-06-27 02:53:55 -07006284static DEFINE_SPINLOCK(ata_ratelimit_lock);
Jeff Garzik67846b32005-10-05 02:58:32 -04006285
6286int ata_ratelimit(void)
6287{
6288 int rc;
6289 unsigned long flags;
6290
6291 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6292
6293 if (time_after(jiffies, ratelimit_time)) {
6294 rc = 1;
6295 ratelimit_time = jiffies + (HZ/5);
6296 } else
6297 rc = 0;
6298
6299 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6300
6301 return rc;
6302}
6303
Tejun Heoc22daff2006-04-11 22:22:29 +09006304/**
6305 * ata_wait_register - wait until register value changes
6306 * @reg: IO-mapped register
6307 * @mask: Mask to apply to read register value
6308 * @val: Wait condition
6309 * @interval_msec: polling interval in milliseconds
6310 * @timeout_msec: timeout in milliseconds
6311 *
6312 * Waiting for some bits of register to change is a common
6313 * operation for ATA controllers. This function reads 32bit LE
6314 * IO-mapped register @reg and tests for the following condition.
6315 *
6316 * (*@reg & mask) != val
6317 *
6318 * If the condition is met, it returns; otherwise, the process is
6319 * repeated after @interval_msec until timeout.
6320 *
6321 * LOCKING:
6322 * Kernel thread context (may sleep)
6323 *
6324 * RETURNS:
6325 * The final register value.
6326 */
6327u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6328 unsigned long interval_msec,
6329 unsigned long timeout_msec)
6330{
6331 unsigned long timeout;
6332 u32 tmp;
6333
6334 tmp = ioread32(reg);
6335
6336 /* Calculate timeout _after_ the first read to make sure
6337 * preceding writes reach the controller before starting to
6338 * eat away the timeout.
6339 */
6340 timeout = jiffies + (timeout_msec * HZ) / 1000;
6341
6342 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6343 msleep(interval_msec);
6344 tmp = ioread32(reg);
6345 }
6346
6347 return tmp;
6348}
6349
Linus Torvalds1da177e2005-04-16 15:20:36 -07006350/*
Tejun Heodd5b06c2006-08-10 16:59:12 +09006351 * Dummy port_ops
6352 */
6353static void ata_dummy_noret(struct ata_port *ap) { }
6354static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6355static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6356
6357static u8 ata_dummy_check_status(struct ata_port *ap)
6358{
6359 return ATA_DRDY;
6360}
6361
6362static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6363{
6364 return AC_ERR_SYSTEM;
6365}
6366
6367const struct ata_port_operations ata_dummy_port_ops = {
6368 .port_disable = ata_port_disable,
6369 .check_status = ata_dummy_check_status,
6370 .check_altstatus = ata_dummy_check_status,
6371 .dev_select = ata_noop_dev_select,
6372 .qc_prep = ata_noop_qc_prep,
6373 .qc_issue = ata_dummy_qc_issue,
6374 .freeze = ata_dummy_noret,
6375 .thaw = ata_dummy_noret,
6376 .error_handler = ata_dummy_noret,
6377 .post_internal_cmd = ata_dummy_qc_noret,
6378 .irq_clear = ata_dummy_noret,
6379 .port_start = ata_dummy_ret0,
6380 .port_stop = ata_dummy_noret,
6381};
6382
6383/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006384 * libata is essentially a library of internal helper functions for
6385 * low-level ATA host controller drivers. As such, the API/ABI is
6386 * likely to change as new drivers are added and updated.
6387 * Do not depend on ABI/API stability.
6388 */
6389
Tejun Heoe9c83912006-07-03 16:07:26 +09006390EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6391EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6392EXPORT_SYMBOL_GPL(sata_deb_timing_long);
Tejun Heodd5b06c2006-08-10 16:59:12 +09006393EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006394EXPORT_SYMBOL_GPL(ata_std_bios_param);
6395EXPORT_SYMBOL_GPL(ata_std_ports);
Jeff Garzikcca39742006-08-24 03:19:22 -04006396EXPORT_SYMBOL_GPL(ata_host_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006397EXPORT_SYMBOL_GPL(ata_device_add);
Tejun Heo720ba122006-05-31 18:28:13 +09006398EXPORT_SYMBOL_GPL(ata_port_detach);
Jeff Garzikcca39742006-08-24 03:19:22 -04006399EXPORT_SYMBOL_GPL(ata_host_remove);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006400EXPORT_SYMBOL_GPL(ata_sg_init);
6401EXPORT_SYMBOL_GPL(ata_sg_init_one);
Tejun Heo9a1004d2006-05-31 18:27:52 +09006402EXPORT_SYMBOL_GPL(ata_hsm_move);
Tejun Heof686bcb2006-05-15 20:58:05 +09006403EXPORT_SYMBOL_GPL(ata_qc_complete);
Tejun Heodedaf2b2006-05-15 21:03:43 +09006404EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006405EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006406EXPORT_SYMBOL_GPL(ata_tf_load);
6407EXPORT_SYMBOL_GPL(ata_tf_read);
6408EXPORT_SYMBOL_GPL(ata_noop_dev_select);
6409EXPORT_SYMBOL_GPL(ata_std_dev_select);
6410EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6411EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6412EXPORT_SYMBOL_GPL(ata_check_status);
6413EXPORT_SYMBOL_GPL(ata_altstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006414EXPORT_SYMBOL_GPL(ata_exec_command);
6415EXPORT_SYMBOL_GPL(ata_port_start);
6416EXPORT_SYMBOL_GPL(ata_port_stop);
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04006417EXPORT_SYMBOL_GPL(ata_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006418EXPORT_SYMBOL_GPL(ata_interrupt);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01006419EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
6420EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
Alan Cox75e99582006-05-24 14:14:41 +01006421EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006422EXPORT_SYMBOL_GPL(ata_qc_prep);
Brian Kinge46834c2006-03-17 17:04:03 -06006423EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006424EXPORT_SYMBOL_GPL(ata_bmdma_setup);
6425EXPORT_SYMBOL_GPL(ata_bmdma_start);
6426EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
6427EXPORT_SYMBOL_GPL(ata_bmdma_status);
6428EXPORT_SYMBOL_GPL(ata_bmdma_stop);
Tejun Heo6d97dbd2006-05-15 20:58:24 +09006429EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
6430EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
6431EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
6432EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
6433EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006434EXPORT_SYMBOL_GPL(ata_port_probe);
Tejun Heo3c567b72006-05-15 20:57:23 +09006435EXPORT_SYMBOL_GPL(sata_set_spd);
Tejun Heod7bb4cc2006-05-31 18:27:46 +09006436EXPORT_SYMBOL_GPL(sata_phy_debounce);
6437EXPORT_SYMBOL_GPL(sata_phy_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006438EXPORT_SYMBOL_GPL(sata_phy_reset);
6439EXPORT_SYMBOL_GPL(__sata_phy_reset);
6440EXPORT_SYMBOL_GPL(ata_bus_reset);
Tejun Heof5914a42006-05-31 18:27:48 +09006441EXPORT_SYMBOL_GPL(ata_std_prereset);
Tejun Heoc2bd5802006-01-24 17:05:22 +09006442EXPORT_SYMBOL_GPL(ata_std_softreset);
Tejun Heob6103f62006-11-01 17:59:53 +09006443EXPORT_SYMBOL_GPL(sata_port_hardreset);
Tejun Heoc2bd5802006-01-24 17:05:22 +09006444EXPORT_SYMBOL_GPL(sata_std_hardreset);
6445EXPORT_SYMBOL_GPL(ata_std_postreset);
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05006446EXPORT_SYMBOL_GPL(ata_dev_classify);
6447EXPORT_SYMBOL_GPL(ata_dev_pair);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006448EXPORT_SYMBOL_GPL(ata_port_disable);
Jeff Garzik67846b32005-10-05 02:58:32 -04006449EXPORT_SYMBOL_GPL(ata_ratelimit);
Tejun Heoc22daff2006-04-11 22:22:29 +09006450EXPORT_SYMBOL_GPL(ata_wait_register);
Tejun Heo6f8b9952006-01-24 17:05:21 +09006451EXPORT_SYMBOL_GPL(ata_busy_sleep);
Tejun Heo86e45b62006-03-05 15:29:09 +09006452EXPORT_SYMBOL_GPL(ata_port_queue_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006453EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6454EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006455EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
Tejun Heo83c47bc2006-05-31 18:28:07 +09006456EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
Tejun Heoa6e6ce82006-05-15 21:03:48 +09006457EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006458EXPORT_SYMBOL_GPL(ata_scsi_release);
6459EXPORT_SYMBOL_GPL(ata_host_intr);
Tejun Heo34bf2172006-05-15 20:57:46 +09006460EXPORT_SYMBOL_GPL(sata_scr_valid);
6461EXPORT_SYMBOL_GPL(sata_scr_read);
6462EXPORT_SYMBOL_GPL(sata_scr_write);
6463EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6464EXPORT_SYMBOL_GPL(ata_port_online);
6465EXPORT_SYMBOL_GPL(ata_port_offline);
Jeff Garzikcca39742006-08-24 03:19:22 -04006466EXPORT_SYMBOL_GPL(ata_host_suspend);
6467EXPORT_SYMBOL_GPL(ata_host_resume);
Tejun Heo6a62a042006-02-13 10:02:46 +09006468EXPORT_SYMBOL_GPL(ata_id_string);
6469EXPORT_SYMBOL_GPL(ata_id_c_string);
Alan Cox6919a0a2006-10-27 19:08:46 -07006470EXPORT_SYMBOL_GPL(ata_device_blacklisted);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006471EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6472
Alan Cox1bc4ccf2006-01-09 17:18:14 +00006473EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
Alan Cox452503f2005-10-21 19:01:32 -04006474EXPORT_SYMBOL_GPL(ata_timing_compute);
6475EXPORT_SYMBOL_GPL(ata_timing_merge);
6476
Linus Torvalds1da177e2005-04-16 15:20:36 -07006477#ifdef CONFIG_PCI
6478EXPORT_SYMBOL_GPL(pci_test_config_bits);
Jeff Garzik374b1872005-08-30 05:42:52 -04006479EXPORT_SYMBOL_GPL(ata_pci_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006480EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
6481EXPORT_SYMBOL_GPL(ata_pci_init_one);
6482EXPORT_SYMBOL_GPL(ata_pci_remove_one);
Tejun Heo500530f2006-07-03 16:07:27 +09006483EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6484EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
Jens Axboe9b847542006-01-06 09:28:07 +01006485EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6486EXPORT_SYMBOL_GPL(ata_pci_device_resume);
Alan Cox67951ad2006-03-22 15:55:54 +00006487EXPORT_SYMBOL_GPL(ata_pci_default_filter);
6488EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006489#endif /* CONFIG_PCI */
Jens Axboe9b847542006-01-06 09:28:07 +01006490
Jens Axboe9b847542006-01-06 09:28:07 +01006491EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
6492EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
Tejun Heoece1d632006-04-02 18:51:53 +09006493
Tejun Heoece1d632006-04-02 18:51:53 +09006494EXPORT_SYMBOL_GPL(ata_eng_timeout);
Tejun Heo7b70fc02006-05-15 20:58:07 +09006495EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6496EXPORT_SYMBOL_GPL(ata_port_abort);
Tejun Heoe3180492006-05-15 20:58:09 +09006497EXPORT_SYMBOL_GPL(ata_port_freeze);
6498EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6499EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
Tejun Heoece1d632006-04-02 18:51:53 +09006500EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6501EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
Tejun Heo022bdb02006-05-15 20:58:22 +09006502EXPORT_SYMBOL_GPL(ata_do_eh);