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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
Jeff Garzikfda0efc2007-01-31 07:43:15 -050062#define DRV_VERSION "2.10" /* must be exactly four chars */
63
64
Tejun Heod7bb4cc2006-05-31 18:27:46 +090065/* debounce timing parameters in msecs { interval, duration, timeout } */
Tejun Heoe9c83912006-07-03 16:07:26 +090066const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
67const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
68const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
Tejun Heod7bb4cc2006-05-31 18:27:46 +090069
Tejun Heo3373efd2006-05-15 20:57:53 +090070static unsigned int ata_dev_init_params(struct ata_device *dev,
71 u16 heads, u16 sectors);
72static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
73static void ata_dev_xfermask(struct ata_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75static unsigned int ata_unique_id = 1;
76static struct workqueue_struct *ata_wq;
77
Tejun Heo453b07a2006-05-31 18:27:42 +090078struct workqueue_struct *ata_aux_wq;
79
Jeff Garzik418dc1f2006-03-11 20:50:08 -050080int atapi_enabled = 1;
Jeff Garzik1623c812005-08-30 03:37:42 -040081module_param(atapi_enabled, int, 0444);
82MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
83
Albert Lee95de7192006-04-04 10:57:18 +080084int atapi_dmadir = 0;
85module_param(atapi_dmadir, int, 0444);
86MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
87
Jeff Garzikc3c013a2006-02-27 22:31:19 -050088int libata_fua = 0;
89module_param_named(fua, libata_fua, int, 0444);
90MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
91
Andrew Mortona8601e52006-06-25 01:36:52 -070092static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
93module_param(ata_probe_timeout, int, 0444);
94MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096MODULE_AUTHOR("Jeff Garzik");
97MODULE_DESCRIPTION("Library module for ATA devices");
98MODULE_LICENSE("GPL");
99MODULE_VERSION(DRV_VERSION);
100
Edward Falk0baab862005-06-02 18:17:13 -0400101
102/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
104 * @tf: Taskfile to convert
105 * @fis: Buffer into which data will output
106 * @pmp: Port multiplier port
107 *
108 * Converts a standard ATA taskfile to a Serial ATA
109 * FIS structure (Register - Host to Device).
110 *
111 * LOCKING:
112 * Inherited from caller.
113 */
114
Jeff Garzik057ace52005-10-22 14:27:05 -0400115void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 fis[0] = 0x27; /* Register - Host to Device FIS */
118 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
119 bit 7 indicates Command FIS */
120 fis[2] = tf->command;
121 fis[3] = tf->feature;
122
123 fis[4] = tf->lbal;
124 fis[5] = tf->lbam;
125 fis[6] = tf->lbah;
126 fis[7] = tf->device;
127
128 fis[8] = tf->hob_lbal;
129 fis[9] = tf->hob_lbam;
130 fis[10] = tf->hob_lbah;
131 fis[11] = tf->hob_feature;
132
133 fis[12] = tf->nsect;
134 fis[13] = tf->hob_nsect;
135 fis[14] = 0;
136 fis[15] = tf->ctl;
137
138 fis[16] = 0;
139 fis[17] = 0;
140 fis[18] = 0;
141 fis[19] = 0;
142}
143
144/**
145 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
146 * @fis: Buffer from which data will be input
147 * @tf: Taskfile to output
148 *
Mark Lorde12a1be2005-11-12 18:55:45 -0500149 * Converts a serial ATA FIS structure to a standard ATA taskfile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 *
151 * LOCKING:
152 * Inherited from caller.
153 */
154
Jeff Garzik057ace52005-10-22 14:27:05 -0400155void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 tf->command = fis[2]; /* status */
158 tf->feature = fis[3]; /* error */
159
160 tf->lbal = fis[4];
161 tf->lbam = fis[5];
162 tf->lbah = fis[6];
163 tf->device = fis[7];
164
165 tf->hob_lbal = fis[8];
166 tf->hob_lbam = fis[9];
167 tf->hob_lbah = fis[10];
168
169 tf->nsect = fis[12];
170 tf->hob_nsect = fis[13];
171}
172
Albert Lee8cbd6df2005-10-12 15:06:27 +0800173static const u8 ata_rw_cmds[] = {
174 /* pio multi */
175 ATA_CMD_READ_MULTI,
176 ATA_CMD_WRITE_MULTI,
177 ATA_CMD_READ_MULTI_EXT,
178 ATA_CMD_WRITE_MULTI_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100179 0,
180 0,
181 0,
182 ATA_CMD_WRITE_MULTI_FUA_EXT,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800183 /* pio */
184 ATA_CMD_PIO_READ,
185 ATA_CMD_PIO_WRITE,
186 ATA_CMD_PIO_READ_EXT,
187 ATA_CMD_PIO_WRITE_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100188 0,
189 0,
190 0,
191 0,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800192 /* dma */
193 ATA_CMD_READ,
194 ATA_CMD_WRITE,
195 ATA_CMD_READ_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100196 ATA_CMD_WRITE_EXT,
197 0,
198 0,
199 0,
200 ATA_CMD_WRITE_FUA_EXT
Albert Lee8cbd6df2005-10-12 15:06:27 +0800201};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203/**
Albert Lee8cbd6df2005-10-12 15:06:27 +0800204 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
Tejun Heobd056d72006-11-14 22:47:10 +0900205 * @tf: command to examine and configure
206 * @dev: device tf belongs to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500208 * Examine the device configuration and tf->flags to calculate
Albert Lee8cbd6df2005-10-12 15:06:27 +0800209 * the proper read/write commands and protocol to use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 *
211 * LOCKING:
212 * caller.
213 */
Tejun Heobd056d72006-11-14 22:47:10 +0900214static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100216 u8 cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100218 int index, fua, lba48, write;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500219
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100220 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800221 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
222 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Albert Lee8cbd6df2005-10-12 15:06:27 +0800224 if (dev->flags & ATA_DFLAG_PIO) {
225 tf->protocol = ATA_PROT_PIO;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100226 index = dev->multi_count ? 0 : 8;
Tejun Heobd056d72006-11-14 22:47:10 +0900227 } else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
Alan Cox8d238e02006-01-17 20:50:31 +0000228 /* Unable to use DMA due to host limitation */
229 tf->protocol = ATA_PROT_PIO;
Albert Lee0565c262006-02-13 18:55:25 +0800230 index = dev->multi_count ? 0 : 8;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800231 } else {
232 tf->protocol = ATA_PROT_DMA;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100233 index = 16;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100236 cmd = ata_rw_cmds[index + fua + lba48 + write];
237 if (cmd) {
238 tf->command = cmd;
239 return 0;
240 }
241 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
Tejun Heocb95d562006-03-06 04:31:56 +0900244/**
Tejun Heo35b649f2006-11-14 22:37:35 +0900245 * ata_tf_read_block - Read block address from ATA taskfile
246 * @tf: ATA taskfile of interest
247 * @dev: ATA device @tf belongs to
248 *
249 * LOCKING:
250 * None.
251 *
252 * Read block address from @tf. This function can handle all
253 * three address formats - LBA, LBA48 and CHS. tf->protocol and
254 * flags select the address format to use.
255 *
256 * RETURNS:
257 * Block address read from @tf.
258 */
259u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
260{
261 u64 block = 0;
262
263 if (tf->flags & ATA_TFLAG_LBA) {
264 if (tf->flags & ATA_TFLAG_LBA48) {
265 block |= (u64)tf->hob_lbah << 40;
266 block |= (u64)tf->hob_lbam << 32;
267 block |= tf->hob_lbal << 24;
268 } else
269 block |= (tf->device & 0xf) << 24;
270
271 block |= tf->lbah << 16;
272 block |= tf->lbam << 8;
273 block |= tf->lbal;
274 } else {
275 u32 cyl, head, sect;
276
277 cyl = tf->lbam | (tf->lbah << 8);
278 head = tf->device & 0xf;
279 sect = tf->lbal;
280
281 block = (cyl * dev->heads + head) * dev->sectors + sect;
282 }
283
284 return block;
285}
286
287/**
Tejun Heobd056d72006-11-14 22:47:10 +0900288 * ata_build_rw_tf - Build ATA taskfile for given read/write request
289 * @tf: Target ATA taskfile
290 * @dev: ATA device @tf belongs to
291 * @block: Block address
292 * @n_block: Number of blocks
293 * @tf_flags: RW/FUA etc...
294 * @tag: tag
295 *
296 * LOCKING:
297 * None.
298 *
299 * Build ATA taskfile @tf for read/write request described by
300 * @block, @n_block, @tf_flags and @tag on @dev.
301 *
302 * RETURNS:
303 *
304 * 0 on success, -ERANGE if the request is too large for @dev,
305 * -EINVAL if the request is invalid.
306 */
307int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
308 u64 block, u32 n_block, unsigned int tf_flags,
309 unsigned int tag)
310{
311 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
312 tf->flags |= tf_flags;
313
314 if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
Tejun Heo70e6ad02006-11-14 22:47:10 +0900315 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ &&
316 likely(tag != ATA_TAG_INTERNAL)) {
Tejun Heobd056d72006-11-14 22:47:10 +0900317 /* yay, NCQ */
318 if (!lba_48_ok(block, n_block))
319 return -ERANGE;
320
321 tf->protocol = ATA_PROT_NCQ;
322 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
323
324 if (tf->flags & ATA_TFLAG_WRITE)
325 tf->command = ATA_CMD_FPDMA_WRITE;
326 else
327 tf->command = ATA_CMD_FPDMA_READ;
328
329 tf->nsect = tag << 3;
330 tf->hob_feature = (n_block >> 8) & 0xff;
331 tf->feature = n_block & 0xff;
332
333 tf->hob_lbah = (block >> 40) & 0xff;
334 tf->hob_lbam = (block >> 32) & 0xff;
335 tf->hob_lbal = (block >> 24) & 0xff;
336 tf->lbah = (block >> 16) & 0xff;
337 tf->lbam = (block >> 8) & 0xff;
338 tf->lbal = block & 0xff;
339
340 tf->device = 1 << 6;
341 if (tf->flags & ATA_TFLAG_FUA)
342 tf->device |= 1 << 7;
343 } else if (dev->flags & ATA_DFLAG_LBA) {
344 tf->flags |= ATA_TFLAG_LBA;
345
346 if (lba_28_ok(block, n_block)) {
347 /* use LBA28 */
348 tf->device |= (block >> 24) & 0xf;
349 } else if (lba_48_ok(block, n_block)) {
350 if (!(dev->flags & ATA_DFLAG_LBA48))
351 return -ERANGE;
352
353 /* use LBA48 */
354 tf->flags |= ATA_TFLAG_LBA48;
355
356 tf->hob_nsect = (n_block >> 8) & 0xff;
357
358 tf->hob_lbah = (block >> 40) & 0xff;
359 tf->hob_lbam = (block >> 32) & 0xff;
360 tf->hob_lbal = (block >> 24) & 0xff;
361 } else
362 /* request too large even for LBA48 */
363 return -ERANGE;
364
365 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
366 return -EINVAL;
367
368 tf->nsect = n_block & 0xff;
369
370 tf->lbah = (block >> 16) & 0xff;
371 tf->lbam = (block >> 8) & 0xff;
372 tf->lbal = block & 0xff;
373
374 tf->device |= ATA_LBA;
375 } else {
376 /* CHS */
377 u32 sect, head, cyl, track;
378
379 /* The request -may- be too large for CHS addressing. */
380 if (!lba_28_ok(block, n_block))
381 return -ERANGE;
382
383 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
384 return -EINVAL;
385
386 /* Convert LBA to CHS */
387 track = (u32)block / dev->sectors;
388 cyl = track / dev->heads;
389 head = track % dev->heads;
390 sect = (u32)block % dev->sectors + 1;
391
392 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
393 (u32)block, track, cyl, head, sect);
394
395 /* Check whether the converted CHS can fit.
396 Cylinder: 0-65535
397 Head: 0-15
398 Sector: 1-255*/
399 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
400 return -ERANGE;
401
402 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
403 tf->lbal = sect;
404 tf->lbam = cyl;
405 tf->lbah = cyl >> 8;
406 tf->device |= head;
407 }
408
409 return 0;
410}
411
412/**
Tejun Heocb95d562006-03-06 04:31:56 +0900413 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
414 * @pio_mask: pio_mask
415 * @mwdma_mask: mwdma_mask
416 * @udma_mask: udma_mask
417 *
418 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
419 * unsigned int xfer_mask.
420 *
421 * LOCKING:
422 * None.
423 *
424 * RETURNS:
425 * Packed xfer_mask.
426 */
427static unsigned int ata_pack_xfermask(unsigned int pio_mask,
428 unsigned int mwdma_mask,
429 unsigned int udma_mask)
430{
431 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
432 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
433 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
434}
435
Tejun Heoc0489e42006-03-24 14:07:49 +0900436/**
437 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
438 * @xfer_mask: xfer_mask to unpack
439 * @pio_mask: resulting pio_mask
440 * @mwdma_mask: resulting mwdma_mask
441 * @udma_mask: resulting udma_mask
442 *
443 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
444 * Any NULL distination masks will be ignored.
445 */
446static void ata_unpack_xfermask(unsigned int xfer_mask,
447 unsigned int *pio_mask,
448 unsigned int *mwdma_mask,
449 unsigned int *udma_mask)
450{
451 if (pio_mask)
452 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
453 if (mwdma_mask)
454 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
455 if (udma_mask)
456 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
457}
458
Tejun Heocb95d562006-03-06 04:31:56 +0900459static const struct ata_xfer_ent {
Tejun Heobe9a50c2006-03-31 22:48:52 +0900460 int shift, bits;
Tejun Heocb95d562006-03-06 04:31:56 +0900461 u8 base;
462} ata_xfer_tbl[] = {
463 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
464 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
465 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
466 { -1, },
467};
468
469/**
470 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
471 * @xfer_mask: xfer_mask of interest
472 *
473 * Return matching XFER_* value for @xfer_mask. Only the highest
474 * bit of @xfer_mask is considered.
475 *
476 * LOCKING:
477 * None.
478 *
479 * RETURNS:
480 * Matching XFER_* value, 0 if no match found.
481 */
482static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
483{
484 int highbit = fls(xfer_mask) - 1;
485 const struct ata_xfer_ent *ent;
486
487 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
488 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
489 return ent->base + highbit - ent->shift;
490 return 0;
491}
492
493/**
494 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
495 * @xfer_mode: XFER_* of interest
496 *
497 * Return matching xfer_mask for @xfer_mode.
498 *
499 * LOCKING:
500 * None.
501 *
502 * RETURNS:
503 * Matching xfer_mask, 0 if no match found.
504 */
505static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
506{
507 const struct ata_xfer_ent *ent;
508
509 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
510 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
511 return 1 << (ent->shift + xfer_mode - ent->base);
512 return 0;
513}
514
515/**
516 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
517 * @xfer_mode: XFER_* of interest
518 *
519 * Return matching xfer_shift for @xfer_mode.
520 *
521 * LOCKING:
522 * None.
523 *
524 * RETURNS:
525 * Matching xfer_shift, -1 if no match found.
526 */
527static int ata_xfer_mode2shift(unsigned int xfer_mode)
528{
529 const struct ata_xfer_ent *ent;
530
531 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
532 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
533 return ent->shift;
534 return -1;
535}
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537/**
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900538 * ata_mode_string - convert xfer_mask to string
539 * @xfer_mask: mask of bits supported; only highest bit counts.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 *
541 * Determine string which represents the highest speed
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900542 * (highest bit in @modemask).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 *
544 * LOCKING:
545 * None.
546 *
547 * RETURNS:
548 * Constant C string representing highest speed listed in
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900549 * @mode_mask, or the constant C string "<n/a>".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 */
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900551static const char *ata_mode_string(unsigned int xfer_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Tejun Heo75f554b2006-03-06 04:31:57 +0900553 static const char * const xfer_mode_str[] = {
554 "PIO0",
555 "PIO1",
556 "PIO2",
557 "PIO3",
558 "PIO4",
Alan Coxb352e572006-08-10 18:52:12 +0100559 "PIO5",
560 "PIO6",
Tejun Heo75f554b2006-03-06 04:31:57 +0900561 "MWDMA0",
562 "MWDMA1",
563 "MWDMA2",
Alan Coxb352e572006-08-10 18:52:12 +0100564 "MWDMA3",
565 "MWDMA4",
Tejun Heo75f554b2006-03-06 04:31:57 +0900566 "UDMA/16",
567 "UDMA/25",
568 "UDMA/33",
569 "UDMA/44",
570 "UDMA/66",
571 "UDMA/100",
572 "UDMA/133",
573 "UDMA7",
574 };
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900575 int highbit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900577 highbit = fls(xfer_mask) - 1;
578 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
579 return xfer_mode_str[highbit];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 return "<n/a>";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
582
Tejun Heo4c360c82006-04-01 01:38:17 +0900583static const char *sata_spd_string(unsigned int spd)
584{
585 static const char * const spd_str[] = {
586 "1.5 Gbps",
587 "3.0 Gbps",
588 };
589
590 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
591 return "<unknown>";
592 return spd_str[spd - 1];
593}
594
Tejun Heo3373efd2006-05-15 20:57:53 +0900595void ata_dev_disable(struct ata_device *dev)
Tejun Heo0b8efb02006-03-24 15:25:31 +0900596{
Borislav Petkov0dd4b212006-06-23 02:29:08 -0400597 if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
Tejun Heof15a1da2006-05-15 20:57:56 +0900598 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
Tejun Heo0b8efb02006-03-24 15:25:31 +0900599 dev->class++;
600 }
601}
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 * ata_devchk - PATA device presence detection
605 * @ap: ATA channel to examine
606 * @device: Device to examine (starting at zero)
607 *
Tejun Heo0d5ff562007-02-01 15:06:36 +0900608 * This technique was originally described in
609 * Hale Landis's ATADRVR (www.ata-atapi.com), and
610 * later found its way into the ATA/ATAPI spec.
611 *
612 * Write a pattern to the ATA shadow registers,
613 * and if a device is present, it will respond by
614 * correctly storing and echoing back the
615 * ATA shadow register contents.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 *
617 * LOCKING:
618 * caller.
619 */
620
Tejun Heo0d5ff562007-02-01 15:06:36 +0900621static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622{
Tejun Heo0d5ff562007-02-01 15:06:36 +0900623 struct ata_ioports *ioaddr = &ap->ioaddr;
624 u8 nsect, lbal;
625
626 ap->ops->dev_select(ap, device);
627
628 iowrite8(0x55, ioaddr->nsect_addr);
629 iowrite8(0xaa, ioaddr->lbal_addr);
630
631 iowrite8(0xaa, ioaddr->nsect_addr);
632 iowrite8(0x55, ioaddr->lbal_addr);
633
634 iowrite8(0x55, ioaddr->nsect_addr);
635 iowrite8(0xaa, ioaddr->lbal_addr);
636
637 nsect = ioread8(ioaddr->nsect_addr);
638 lbal = ioread8(ioaddr->lbal_addr);
639
640 if ((nsect == 0x55) && (lbal == 0xaa))
641 return 1; /* we found a device */
642
643 return 0; /* nothing found */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644}
645
646/**
647 * ata_dev_classify - determine device type based on ATA-spec signature
648 * @tf: ATA taskfile register set for device to be identified
649 *
650 * Determine from taskfile register contents whether a device is
651 * ATA or ATAPI, as per "Signature and persistence" section
652 * of ATA/PI spec (volume 1, sect 5.14).
653 *
654 * LOCKING:
655 * None.
656 *
657 * RETURNS:
658 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
659 * the event of failure.
660 */
661
Jeff Garzik057ace52005-10-22 14:27:05 -0400662unsigned int ata_dev_classify(const struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
664 /* Apple's open source Darwin code hints that some devices only
665 * put a proper signature into the LBA mid/high registers,
666 * So, we only check those. It's sufficient for uniqueness.
667 */
668
669 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
670 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
671 DPRINTK("found ATA device by sig\n");
672 return ATA_DEV_ATA;
673 }
674
675 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
676 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
677 DPRINTK("found ATAPI device by sig\n");
678 return ATA_DEV_ATAPI;
679 }
680
681 DPRINTK("unknown device\n");
682 return ATA_DEV_UNKNOWN;
683}
684
685/**
686 * ata_dev_try_classify - Parse returned ATA device signature
687 * @ap: ATA channel to examine
688 * @device: Device to examine (starting at zero)
Tejun Heob4dc7622006-01-24 17:05:22 +0900689 * @r_err: Value of error register on completion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 *
691 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
692 * an ATA/ATAPI-defined set of values is placed in the ATA
693 * shadow registers, indicating the results of device detection
694 * and diagnostics.
695 *
696 * Select the ATA device, and read the values from the ATA shadow
697 * registers. Then parse according to the Error register value,
698 * and the spec-defined values examined by ata_dev_classify().
699 *
700 * LOCKING:
701 * caller.
Tejun Heob4dc7622006-01-24 17:05:22 +0900702 *
703 * RETURNS:
704 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 */
706
Tejun Heob4dc7622006-01-24 17:05:22 +0900707static unsigned int
708ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct ata_taskfile tf;
711 unsigned int class;
712 u8 err;
713
714 ap->ops->dev_select(ap, device);
715
716 memset(&tf, 0, sizeof(tf));
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 ap->ops->tf_read(ap, &tf);
Jeff Garzik0169e282005-10-29 21:25:10 -0400719 err = tf.feature;
Tejun Heob4dc7622006-01-24 17:05:22 +0900720 if (r_err)
721 *r_err = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Alan Cox93590852006-09-12 16:55:12 +0100723 /* see if device passed diags: if master then continue and warn later */
724 if (err == 0 && device == 0)
725 /* diagnostic fail : do nothing _YET_ */
726 ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
727 else if (err == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 /* do nothing */ ;
729 else if ((device == 0) && (err == 0x81))
730 /* do nothing */ ;
731 else
Tejun Heob4dc7622006-01-24 17:05:22 +0900732 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Tejun Heob4dc7622006-01-24 17:05:22 +0900734 /* determine if device is ATA or ATAPI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 class = ata_dev_classify(&tf);
Tejun Heob4dc7622006-01-24 17:05:22 +0900736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (class == ATA_DEV_UNKNOWN)
Tejun Heob4dc7622006-01-24 17:05:22 +0900738 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
Tejun Heob4dc7622006-01-24 17:05:22 +0900740 return ATA_DEV_NONE;
741 return class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742}
743
744/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900745 * ata_id_string - Convert IDENTIFY DEVICE page into string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 * @id: IDENTIFY DEVICE results we will examine
747 * @s: string into which data is output
748 * @ofs: offset into identify device page
749 * @len: length of string to return. must be an even number.
750 *
751 * The strings in the IDENTIFY DEVICE page are broken up into
752 * 16-bit chunks. Run through the string, and output each
753 * 8-bit chunk linearly, regardless of platform.
754 *
755 * LOCKING:
756 * caller.
757 */
758
Tejun Heo6a62a042006-02-13 10:02:46 +0900759void ata_id_string(const u16 *id, unsigned char *s,
760 unsigned int ofs, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 unsigned int c;
763
764 while (len > 0) {
765 c = id[ofs] >> 8;
766 *s = c;
767 s++;
768
769 c = id[ofs] & 0xff;
770 *s = c;
771 s++;
772
773 ofs++;
774 len -= 2;
775 }
776}
777
Tejun Heo0e949ff2006-02-12 22:47:04 +0900778/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900779 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
Tejun Heo0e949ff2006-02-12 22:47:04 +0900780 * @id: IDENTIFY DEVICE results we will examine
781 * @s: string into which data is output
782 * @ofs: offset into identify device page
783 * @len: length of string to return. must be an odd number.
784 *
Tejun Heo6a62a042006-02-13 10:02:46 +0900785 * This function is identical to ata_id_string except that it
Tejun Heo0e949ff2006-02-12 22:47:04 +0900786 * trims trailing spaces and terminates the resulting string with
787 * null. @len must be actual maximum length (even number) + 1.
788 *
789 * LOCKING:
790 * caller.
791 */
Tejun Heo6a62a042006-02-13 10:02:46 +0900792void ata_id_c_string(const u16 *id, unsigned char *s,
793 unsigned int ofs, unsigned int len)
Tejun Heo0e949ff2006-02-12 22:47:04 +0900794{
795 unsigned char *p;
796
797 WARN_ON(!(len & 1));
798
Tejun Heo6a62a042006-02-13 10:02:46 +0900799 ata_id_string(id, s, ofs, len - 1);
Tejun Heo0e949ff2006-02-12 22:47:04 +0900800
801 p = s + strnlen(s, len - 1);
802 while (p > s && p[-1] == ' ')
803 p--;
804 *p = '\0';
805}
Edward Falk0baab862005-06-02 18:17:13 -0400806
Tejun Heo29407402006-02-12 22:47:04 +0900807static u64 ata_id_n_sectors(const u16 *id)
808{
809 if (ata_id_has_lba(id)) {
810 if (ata_id_has_lba48(id))
811 return ata_id_u64(id, 100);
812 else
813 return ata_id_u32(id, 60);
814 } else {
815 if (ata_id_current_chs_valid(id))
816 return ata_id_u32(id, 57);
817 else
818 return id[1] * id[3] * id[6];
819 }
820}
821
Edward Falk0baab862005-06-02 18:17:13 -0400822/**
823 * ata_noop_dev_select - Select device 0/1 on ATA bus
824 * @ap: ATA channel to manipulate
825 * @device: ATA device (numbered from zero) to select
826 *
827 * This function performs no actual function.
828 *
829 * May be used as the dev_select() entry in ata_port_operations.
830 *
831 * LOCKING:
832 * caller.
833 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
835{
836}
837
Edward Falk0baab862005-06-02 18:17:13 -0400838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839/**
840 * ata_std_dev_select - Select device 0/1 on ATA bus
841 * @ap: ATA channel to manipulate
842 * @device: ATA device (numbered from zero) to select
843 *
844 * Use the method defined in the ATA specification to
845 * make either device 0, or device 1, active on the
Edward Falk0baab862005-06-02 18:17:13 -0400846 * ATA channel. Works with both PIO and MMIO.
847 *
848 * May be used as the dev_select() entry in ata_port_operations.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 *
850 * LOCKING:
851 * caller.
852 */
853
854void ata_std_dev_select (struct ata_port *ap, unsigned int device)
855{
856 u8 tmp;
857
858 if (device == 0)
859 tmp = ATA_DEVICE_OBS;
860 else
861 tmp = ATA_DEVICE_OBS | ATA_DEV1;
862
Tejun Heo0d5ff562007-02-01 15:06:36 +0900863 iowrite8(tmp, ap->ioaddr.device_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 ata_pause(ap); /* needed; also flushes, for mmio */
865}
866
867/**
868 * ata_dev_select - Select device 0/1 on ATA bus
869 * @ap: ATA channel to manipulate
870 * @device: ATA device (numbered from zero) to select
871 * @wait: non-zero to wait for Status register BSY bit to clear
872 * @can_sleep: non-zero if context allows sleeping
873 *
874 * Use the method defined in the ATA specification to
875 * make either device 0, or device 1, active on the
876 * ATA channel.
877 *
878 * This is a high-level version of ata_std_dev_select(),
879 * which additionally provides the services of inserting
880 * the proper pauses and status polling, where needed.
881 *
882 * LOCKING:
883 * caller.
884 */
885
886void ata_dev_select(struct ata_port *ap, unsigned int device,
887 unsigned int wait, unsigned int can_sleep)
888{
Tejun Heo88574552006-06-25 20:00:35 +0900889 if (ata_msg_probe(ap))
Borislav Petkov0dd4b212006-06-23 02:29:08 -0400890 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
Tejun Heo88574552006-06-25 20:00:35 +0900891 "device %u, wait %u\n", ap->id, device, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
893 if (wait)
894 ata_wait_idle(ap);
895
896 ap->ops->dev_select(ap, device);
897
898 if (wait) {
899 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
900 msleep(150);
901 ata_wait_idle(ap);
902 }
903}
904
905/**
906 * ata_dump_id - IDENTIFY DEVICE info debugging output
Tejun Heo0bd33002006-02-12 22:47:05 +0900907 * @id: IDENTIFY DEVICE page to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 *
Tejun Heo0bd33002006-02-12 22:47:05 +0900909 * Dump selected 16-bit words from the given IDENTIFY DEVICE
910 * page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 *
912 * LOCKING:
913 * caller.
914 */
915
Tejun Heo0bd33002006-02-12 22:47:05 +0900916static inline void ata_dump_id(const u16 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
918 DPRINTK("49==0x%04x "
919 "53==0x%04x "
920 "63==0x%04x "
921 "64==0x%04x "
922 "75==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900923 id[49],
924 id[53],
925 id[63],
926 id[64],
927 id[75]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 DPRINTK("80==0x%04x "
929 "81==0x%04x "
930 "82==0x%04x "
931 "83==0x%04x "
932 "84==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900933 id[80],
934 id[81],
935 id[82],
936 id[83],
937 id[84]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 DPRINTK("88==0x%04x "
939 "93==0x%04x\n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900940 id[88],
941 id[93]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942}
943
Tejun Heocb95d562006-03-06 04:31:56 +0900944/**
945 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
946 * @id: IDENTIFY data to compute xfer mask from
947 *
948 * Compute the xfermask for this device. This is not as trivial
949 * as it seems if we must consider early devices correctly.
950 *
951 * FIXME: pre IDE drive timing (do we care ?).
952 *
953 * LOCKING:
954 * None.
955 *
956 * RETURNS:
957 * Computed xfermask
958 */
959static unsigned int ata_id_xfermask(const u16 *id)
960{
961 unsigned int pio_mask, mwdma_mask, udma_mask;
962
963 /* Usual case. Word 53 indicates word 64 is valid */
964 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
965 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
966 pio_mask <<= 3;
967 pio_mask |= 0x7;
968 } else {
969 /* If word 64 isn't valid then Word 51 high byte holds
970 * the PIO timing number for the maximum. Turn it into
971 * a mask.
972 */
Lennert Buytenhek7a0f1c82007-01-29 13:28:47 +0100973 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
Alan Cox46767aeb2006-09-29 18:26:47 +0100974 if (mode < 5) /* Valid PIO range */
975 pio_mask = (2 << mode) - 1;
976 else
977 pio_mask = 1;
Tejun Heocb95d562006-03-06 04:31:56 +0900978
979 /* But wait.. there's more. Design your standards by
980 * committee and you too can get a free iordy field to
981 * process. However its the speeds not the modes that
982 * are supported... Note drivers using the timing API
983 * will get this right anyway
984 */
985 }
986
987 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
Tejun Heofb21f0d2006-03-12 12:34:35 +0900988
Alan Coxb352e572006-08-10 18:52:12 +0100989 if (ata_id_is_cfa(id)) {
990 /*
991 * Process compact flash extended modes
992 */
993 int pio = id[163] & 0x7;
994 int dma = (id[163] >> 3) & 7;
995
996 if (pio)
997 pio_mask |= (1 << 5);
998 if (pio > 1)
999 pio_mask |= (1 << 6);
1000 if (dma)
1001 mwdma_mask |= (1 << 3);
1002 if (dma > 1)
1003 mwdma_mask |= (1 << 4);
1004 }
1005
Tejun Heofb21f0d2006-03-12 12:34:35 +09001006 udma_mask = 0;
1007 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1008 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
Tejun Heocb95d562006-03-06 04:31:56 +09001009
1010 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1011}
1012
Tejun Heo86e45b62006-03-05 15:29:09 +09001013/**
1014 * ata_port_queue_task - Queue port_task
1015 * @ap: The ata_port to queue port_task for
Randy Dunlape2a7f772006-05-18 10:50:18 -07001016 * @fn: workqueue function to be scheduled
David Howells65f27f32006-11-22 14:55:48 +00001017 * @data: data for @fn to use
Randy Dunlape2a7f772006-05-18 10:50:18 -07001018 * @delay: delay time for workqueue function
Tejun Heo86e45b62006-03-05 15:29:09 +09001019 *
1020 * Schedule @fn(@data) for execution after @delay jiffies using
1021 * port_task. There is one port_task per port and it's the
1022 * user(low level driver)'s responsibility to make sure that only
1023 * one task is active at any given time.
1024 *
1025 * libata core layer takes care of synchronization between
1026 * port_task and EH. ata_port_queue_task() may be ignored for EH
1027 * synchronization.
1028 *
1029 * LOCKING:
1030 * Inherited from caller.
1031 */
David Howells65f27f32006-11-22 14:55:48 +00001032void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
Tejun Heo86e45b62006-03-05 15:29:09 +09001033 unsigned long delay)
1034{
1035 int rc;
1036
Tejun Heob51e9e52006-06-29 01:29:30 +09001037 if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
Tejun Heo86e45b62006-03-05 15:29:09 +09001038 return;
1039
David Howells65f27f32006-11-22 14:55:48 +00001040 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1041 ap->port_task_data = data;
Tejun Heo86e45b62006-03-05 15:29:09 +09001042
David Howells52bad642006-11-22 14:54:01 +00001043 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
Tejun Heo86e45b62006-03-05 15:29:09 +09001044
1045 /* rc == 0 means that another user is using port task */
1046 WARN_ON(rc == 0);
1047}
1048
1049/**
1050 * ata_port_flush_task - Flush port_task
1051 * @ap: The ata_port to flush port_task for
1052 *
1053 * After this function completes, port_task is guranteed not to
1054 * be running or scheduled.
1055 *
1056 * LOCKING:
1057 * Kernel thread context (may sleep)
1058 */
1059void ata_port_flush_task(struct ata_port *ap)
1060{
1061 unsigned long flags;
1062
1063 DPRINTK("ENTER\n");
1064
Jeff Garzikba6a1302006-06-22 23:46:10 -04001065 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09001066 ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04001067 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo86e45b62006-03-05 15:29:09 +09001068
1069 DPRINTK("flush #1\n");
1070 flush_workqueue(ata_wq);
1071
1072 /*
1073 * At this point, if a task is running, it's guaranteed to see
1074 * the FLUSH flag; thus, it will never queue pio tasks again.
1075 * Cancel and flush.
1076 */
1077 if (!cancel_delayed_work(&ap->port_task)) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001078 if (ata_msg_ctl(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001079 ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
1080 __FUNCTION__);
Tejun Heo86e45b62006-03-05 15:29:09 +09001081 flush_workqueue(ata_wq);
1082 }
1083
Jeff Garzikba6a1302006-06-22 23:46:10 -04001084 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09001085 ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04001086 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo86e45b62006-03-05 15:29:09 +09001087
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001088 if (ata_msg_ctl(ap))
1089 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
Tejun Heo86e45b62006-03-05 15:29:09 +09001090}
1091
Adrian Bunk7102d232007-01-04 00:09:36 +01001092static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
Tejun Heoa2a7a662005-12-13 14:48:31 +09001093{
Tejun Heo77853bf2006-01-23 13:09:36 +09001094 struct completion *waiting = qc->private_data;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001095
Tejun Heoa2a7a662005-12-13 14:48:31 +09001096 complete(waiting);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001097}
1098
1099/**
Tejun Heo24326972006-11-14 22:47:09 +09001100 * ata_exec_internal_sg - execute libata internal command
Tejun Heoa2a7a662005-12-13 14:48:31 +09001101 * @dev: Device to which the command is sent
1102 * @tf: Taskfile registers for the command and the result
Tejun Heod69cf372006-04-02 18:51:53 +09001103 * @cdb: CDB for packet command
Tejun Heoa2a7a662005-12-13 14:48:31 +09001104 * @dma_dir: Data tranfer direction of the command
Tejun Heo24326972006-11-14 22:47:09 +09001105 * @sg: sg list for the data buffer of the command
1106 * @n_elem: Number of sg entries
Tejun Heoa2a7a662005-12-13 14:48:31 +09001107 *
1108 * Executes libata internal command with timeout. @tf contains
1109 * command on entry and result on return. Timeout and error
1110 * conditions are reported via return value. No recovery action
1111 * is taken after a command times out. It's caller's duty to
1112 * clean up after timeout.
1113 *
1114 * LOCKING:
1115 * None. Should be called with kernel context, might sleep.
Tejun Heo551e8882006-06-12 14:09:49 +09001116 *
1117 * RETURNS:
1118 * Zero on success, AC_ERR_* mask on failure
Tejun Heoa2a7a662005-12-13 14:48:31 +09001119 */
Tejun Heo24326972006-11-14 22:47:09 +09001120unsigned ata_exec_internal_sg(struct ata_device *dev,
1121 struct ata_taskfile *tf, const u8 *cdb,
1122 int dma_dir, struct scatterlist *sg,
1123 unsigned int n_elem)
Tejun Heoa2a7a662005-12-13 14:48:31 +09001124{
Tejun Heo3373efd2006-05-15 20:57:53 +09001125 struct ata_port *ap = dev->ap;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001126 u8 command = tf->command;
1127 struct ata_queued_cmd *qc;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001128 unsigned int tag, preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001129 u32 preempted_sactive, preempted_qc_active;
Ingo Molnar60be6b92006-07-03 00:25:26 -07001130 DECLARE_COMPLETION_ONSTACK(wait);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001131 unsigned long flags;
Tejun Heo77853bf2006-01-23 13:09:36 +09001132 unsigned int err_mask;
Tejun Heod95a7172006-05-15 20:58:14 +09001133 int rc;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001134
Jeff Garzikba6a1302006-06-22 23:46:10 -04001135 spin_lock_irqsave(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001136
Tejun Heoe3180492006-05-15 20:58:09 +09001137 /* no internal command while frozen */
Tejun Heob51e9e52006-06-29 01:29:30 +09001138 if (ap->pflags & ATA_PFLAG_FROZEN) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04001139 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001140 return AC_ERR_SYSTEM;
1141 }
1142
Tejun Heo2ab7db12006-05-15 20:58:02 +09001143 /* initialize internal qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001144
Tejun Heo2ab7db12006-05-15 20:58:02 +09001145 /* XXX: Tag 0 is used for drivers with legacy EH as some
1146 * drivers choke if any other tag is given. This breaks
1147 * ata_tag_internal() test for those drivers. Don't use new
1148 * EH stuff without converting to it.
1149 */
1150 if (ap->ops->error_handler)
1151 tag = ATA_TAG_INTERNAL;
1152 else
1153 tag = 0;
1154
Tejun Heo6cec4a32006-05-15 21:03:41 +09001155 if (test_and_set_bit(tag, &ap->qc_allocated))
Tejun Heo2ab7db12006-05-15 20:58:02 +09001156 BUG();
Tejun Heof69499f2006-05-15 20:58:03 +09001157 qc = __ata_qc_from_tag(ap, tag);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001158
1159 qc->tag = tag;
1160 qc->scsicmd = NULL;
1161 qc->ap = ap;
1162 qc->dev = dev;
1163 ata_qc_reinit(qc);
1164
1165 preempted_tag = ap->active_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001166 preempted_sactive = ap->sactive;
1167 preempted_qc_active = ap->qc_active;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001168 ap->active_tag = ATA_TAG_POISON;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001169 ap->sactive = 0;
1170 ap->qc_active = 0;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001171
1172 /* prepare & issue qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001173 qc->tf = *tf;
Tejun Heod69cf372006-04-02 18:51:53 +09001174 if (cdb)
1175 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
Tejun Heoe61e0672006-05-15 20:57:40 +09001176 qc->flags |= ATA_QCFLAG_RESULT_TF;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001177 qc->dma_dir = dma_dir;
1178 if (dma_dir != DMA_NONE) {
Tejun Heo24326972006-11-14 22:47:09 +09001179 unsigned int i, buflen = 0;
1180
1181 for (i = 0; i < n_elem; i++)
1182 buflen += sg[i].length;
1183
1184 ata_sg_init(qc, sg, n_elem);
Brian King49c80422007-01-30 11:32:26 -06001185 qc->nbytes = buflen;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001186 }
1187
Tejun Heo77853bf2006-01-23 13:09:36 +09001188 qc->private_data = &wait;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001189 qc->complete_fn = ata_qc_complete_internal;
1190
Tejun Heo8e0e6942006-03-31 20:41:11 +09001191 ata_qc_issue(qc);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001192
Jeff Garzikba6a1302006-06-22 23:46:10 -04001193 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001194
Andrew Mortona8601e52006-06-25 01:36:52 -07001195 rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
Albert Lee41ade502006-03-14 11:19:04 +08001196
Tejun Heod95a7172006-05-15 20:58:14 +09001197 ata_port_flush_task(ap);
1198
1199 if (!rc) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04001200 spin_lock_irqsave(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001201
1202 /* We're racing with irq here. If we lose, the
1203 * following test prevents us from completing the qc
Tejun Heod95a7172006-05-15 20:58:14 +09001204 * twice. If we win, the port is frozen and will be
1205 * cleaned up by ->post_internal_cmd().
Tejun Heoa2a7a662005-12-13 14:48:31 +09001206 */
Tejun Heo77853bf2006-01-23 13:09:36 +09001207 if (qc->flags & ATA_QCFLAG_ACTIVE) {
Tejun Heod95a7172006-05-15 20:58:14 +09001208 qc->err_mask |= AC_ERR_TIMEOUT;
1209
1210 if (ap->ops->error_handler)
1211 ata_port_freeze(ap);
1212 else
1213 ata_qc_complete(qc);
Tejun Heof15a1da2006-05-15 20:57:56 +09001214
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001215 if (ata_msg_warn(ap))
1216 ata_dev_printk(dev, KERN_WARNING,
Tejun Heo88574552006-06-25 20:00:35 +09001217 "qc timeout (cmd 0x%x)\n", command);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001218 }
1219
Jeff Garzikba6a1302006-06-22 23:46:10 -04001220 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001221 }
1222
Tejun Heod95a7172006-05-15 20:58:14 +09001223 /* do post_internal_cmd */
1224 if (ap->ops->post_internal_cmd)
1225 ap->ops->post_internal_cmd(qc);
1226
Alan18d90de2007-01-24 11:42:38 +00001227 if ((qc->flags & ATA_QCFLAG_FAILED) && !qc->err_mask) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001228 if (ata_msg_warn(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001229 ata_dev_printk(dev, KERN_WARNING,
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001230 "zero err_mask for failed "
Tejun Heo88574552006-06-25 20:00:35 +09001231 "internal command, assuming AC_ERR_OTHER\n");
Tejun Heod95a7172006-05-15 20:58:14 +09001232 qc->err_mask |= AC_ERR_OTHER;
1233 }
1234
Tejun Heo15869302006-05-15 20:57:33 +09001235 /* finish up */
Jeff Garzikba6a1302006-06-22 23:46:10 -04001236 spin_lock_irqsave(ap->lock, flags);
Tejun Heo15869302006-05-15 20:57:33 +09001237
Tejun Heoe61e0672006-05-15 20:57:40 +09001238 *tf = qc->result_tf;
Tejun Heo77853bf2006-01-23 13:09:36 +09001239 err_mask = qc->err_mask;
1240
1241 ata_qc_free(qc);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001242 ap->active_tag = preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001243 ap->sactive = preempted_sactive;
1244 ap->qc_active = preempted_qc_active;
Tejun Heo77853bf2006-01-23 13:09:36 +09001245
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001246 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1247 * Until those drivers are fixed, we detect the condition
1248 * here, fail the command with AC_ERR_SYSTEM and reenable the
1249 * port.
1250 *
1251 * Note that this doesn't change any behavior as internal
1252 * command failure results in disabling the device in the
1253 * higher layer for LLDDs without new reset/EH callbacks.
1254 *
1255 * Kill the following code as soon as those drivers are fixed.
1256 */
Tejun Heo198e0fe2006-04-02 18:51:52 +09001257 if (ap->flags & ATA_FLAG_DISABLED) {
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001258 err_mask |= AC_ERR_SYSTEM;
1259 ata_port_probe(ap);
1260 }
1261
Jeff Garzikba6a1302006-06-22 23:46:10 -04001262 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo15869302006-05-15 20:57:33 +09001263
Tejun Heo77853bf2006-01-23 13:09:36 +09001264 return err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001265}
1266
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267/**
Tejun Heo33480a02006-12-12 02:15:31 +09001268 * ata_exec_internal - execute libata internal command
Tejun Heo24326972006-11-14 22:47:09 +09001269 * @dev: Device to which the command is sent
1270 * @tf: Taskfile registers for the command and the result
1271 * @cdb: CDB for packet command
1272 * @dma_dir: Data tranfer direction of the command
1273 * @buf: Data buffer of the command
1274 * @buflen: Length of data buffer
1275 *
1276 * Wrapper around ata_exec_internal_sg() which takes simple
1277 * buffer instead of sg list.
1278 *
1279 * LOCKING:
1280 * None. Should be called with kernel context, might sleep.
1281 *
1282 * RETURNS:
1283 * Zero on success, AC_ERR_* mask on failure
1284 */
1285unsigned ata_exec_internal(struct ata_device *dev,
1286 struct ata_taskfile *tf, const u8 *cdb,
1287 int dma_dir, void *buf, unsigned int buflen)
1288{
Tejun Heo33480a02006-12-12 02:15:31 +09001289 struct scatterlist *psg = NULL, sg;
1290 unsigned int n_elem = 0;
Tejun Heo24326972006-11-14 22:47:09 +09001291
Tejun Heo33480a02006-12-12 02:15:31 +09001292 if (dma_dir != DMA_NONE) {
1293 WARN_ON(!buf);
1294 sg_init_one(&sg, buf, buflen);
1295 psg = &sg;
1296 n_elem++;
1297 }
Tejun Heo24326972006-11-14 22:47:09 +09001298
Tejun Heo33480a02006-12-12 02:15:31 +09001299 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
Tejun Heo24326972006-11-14 22:47:09 +09001300}
1301
1302/**
Tejun Heo977e6b92006-06-24 20:30:19 +09001303 * ata_do_simple_cmd - execute simple internal command
1304 * @dev: Device to which the command is sent
1305 * @cmd: Opcode to execute
1306 *
1307 * Execute a 'simple' command, that only consists of the opcode
1308 * 'cmd' itself, without filling any other registers
1309 *
1310 * LOCKING:
1311 * Kernel thread context (may sleep).
1312 *
1313 * RETURNS:
1314 * Zero on success, AC_ERR_* mask on failure
Tejun Heoe58eb582006-06-24 20:30:19 +09001315 */
Tejun Heo77b08fb2006-06-24 20:30:19 +09001316unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
Tejun Heoe58eb582006-06-24 20:30:19 +09001317{
1318 struct ata_taskfile tf;
Tejun Heoe58eb582006-06-24 20:30:19 +09001319
1320 ata_tf_init(dev, &tf);
1321
1322 tf.command = cmd;
1323 tf.flags |= ATA_TFLAG_DEVICE;
1324 tf.protocol = ATA_PROT_NODATA;
1325
Tejun Heo977e6b92006-06-24 20:30:19 +09001326 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Tejun Heoe58eb582006-06-24 20:30:19 +09001327}
1328
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329/**
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001330 * ata_pio_need_iordy - check if iordy needed
1331 * @adev: ATA device
1332 *
1333 * Check if the current speed of the device requires IORDY. Used
1334 * by various controllers for chip configuration.
1335 */
1336
1337unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1338{
1339 int pio;
1340 int speed = adev->pio_mode - XFER_PIO_0;
1341
1342 if (speed < 2)
1343 return 0;
1344 if (speed > 2)
1345 return 1;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001346
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001347 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1348
1349 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1350 pio = adev->id[ATA_ID_EIDE_PIO];
1351 /* Is the speed faster than the drive allows non IORDY ? */
1352 if (pio) {
1353 /* This is cycle times not frequency - watch the logic! */
1354 if (pio > 240) /* PIO2 is 240nS per cycle */
1355 return 1;
1356 return 0;
1357 }
1358 }
1359 return 0;
1360}
1361
1362/**
Tejun Heo49016ac2006-02-21 02:12:11 +09001363 * ata_dev_read_id - Read ID data from the specified device
Tejun Heo49016ac2006-02-21 02:12:11 +09001364 * @dev: target device
1365 * @p_class: pointer to class of the target device (may be changed)
Tejun Heobff04642006-11-10 18:08:10 +09001366 * @flags: ATA_READID_* flags
Tejun Heofe635c72006-05-15 20:57:35 +09001367 * @id: buffer to read IDENTIFY data into
Tejun Heo49016ac2006-02-21 02:12:11 +09001368 *
1369 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1370 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
Tejun Heoaec5c3c2006-03-25 01:33:34 +09001371 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1372 * for pre-ATA4 drives.
Tejun Heo49016ac2006-02-21 02:12:11 +09001373 *
1374 * LOCKING:
1375 * Kernel thread context (may sleep)
1376 *
1377 * RETURNS:
1378 * 0 on success, -errno otherwise.
1379 */
Tejun Heoa9beec92006-05-31 18:27:44 +09001380int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
Tejun Heobff04642006-11-10 18:08:10 +09001381 unsigned int flags, u16 *id)
Tejun Heo49016ac2006-02-21 02:12:11 +09001382{
Tejun Heo3373efd2006-05-15 20:57:53 +09001383 struct ata_port *ap = dev->ap;
Tejun Heo49016ac2006-02-21 02:12:11 +09001384 unsigned int class = *p_class;
Tejun Heo49016ac2006-02-21 02:12:11 +09001385 struct ata_taskfile tf;
1386 unsigned int err_mask = 0;
1387 const char *reason;
1388 int rc;
1389
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001390 if (ata_msg_ctl(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001391 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
1392 __FUNCTION__, ap->id, dev->devno);
Tejun Heo49016ac2006-02-21 02:12:11 +09001393
Tejun Heo49016ac2006-02-21 02:12:11 +09001394 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1395
1396 retry:
Tejun Heo3373efd2006-05-15 20:57:53 +09001397 ata_tf_init(dev, &tf);
Tejun Heo49016ac2006-02-21 02:12:11 +09001398
1399 switch (class) {
1400 case ATA_DEV_ATA:
1401 tf.command = ATA_CMD_ID_ATA;
1402 break;
1403 case ATA_DEV_ATAPI:
1404 tf.command = ATA_CMD_ID_ATAPI;
1405 break;
1406 default:
1407 rc = -ENODEV;
1408 reason = "unsupported class";
1409 goto err_out;
1410 }
1411
1412 tf.protocol = ATA_PROT_PIO;
Tejun Heo800b3992006-12-03 21:34:13 +09001413 tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
Tejun Heo49016ac2006-02-21 02:12:11 +09001414
Tejun Heo3373efd2006-05-15 20:57:53 +09001415 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo49016ac2006-02-21 02:12:11 +09001416 id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo49016ac2006-02-21 02:12:11 +09001417 if (err_mask) {
Tejun Heo800b3992006-12-03 21:34:13 +09001418 if (err_mask & AC_ERR_NODEV_HINT) {
Tejun Heo55a8e2c2006-11-10 18:08:10 +09001419 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1420 ap->id, dev->devno);
1421 return -ENOENT;
1422 }
1423
Tejun Heo49016ac2006-02-21 02:12:11 +09001424 rc = -EIO;
1425 reason = "I/O error";
Tejun Heo49016ac2006-02-21 02:12:11 +09001426 goto err_out;
1427 }
1428
1429 swap_buf_le16(id, ATA_ID_WORDS);
1430
Tejun Heo49016ac2006-02-21 02:12:11 +09001431 /* sanity check */
Tejun Heoa4f57492006-09-12 20:35:49 -07001432 rc = -EINVAL;
1433 reason = "device reports illegal type";
1434
1435 if (class == ATA_DEV_ATA) {
1436 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1437 goto err_out;
1438 } else {
1439 if (ata_id_is_ata(id))
1440 goto err_out;
Tejun Heo49016ac2006-02-21 02:12:11 +09001441 }
1442
Tejun Heobff04642006-11-10 18:08:10 +09001443 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
Tejun Heo49016ac2006-02-21 02:12:11 +09001444 /*
1445 * The exact sequence expected by certain pre-ATA4 drives is:
1446 * SRST RESET
1447 * IDENTIFY
1448 * INITIALIZE DEVICE PARAMETERS
1449 * anything else..
1450 * Some drives were very specific about that exact sequence.
1451 */
1452 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001453 err_mask = ata_dev_init_params(dev, id[3], id[6]);
Tejun Heo49016ac2006-02-21 02:12:11 +09001454 if (err_mask) {
1455 rc = -EIO;
1456 reason = "INIT_DEV_PARAMS failed";
1457 goto err_out;
1458 }
1459
1460 /* current CHS translation info (id[53-58]) might be
1461 * changed. reread the identify device info.
1462 */
Tejun Heobff04642006-11-10 18:08:10 +09001463 flags &= ~ATA_READID_POSTRESET;
Tejun Heo49016ac2006-02-21 02:12:11 +09001464 goto retry;
1465 }
1466 }
1467
1468 *p_class = class;
Tejun Heofe635c72006-05-15 20:57:35 +09001469
Tejun Heo49016ac2006-02-21 02:12:11 +09001470 return 0;
1471
1472 err_out:
Tejun Heo88574552006-06-25 20:00:35 +09001473 if (ata_msg_warn(ap))
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001474 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
Tejun Heo88574552006-06-25 20:00:35 +09001475 "(%s, err_mask=0x%x)\n", reason, err_mask);
Tejun Heo49016ac2006-02-21 02:12:11 +09001476 return rc;
1477}
1478
Tejun Heo3373efd2006-05-15 20:57:53 +09001479static inline u8 ata_dev_knobble(struct ata_device *dev)
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001480{
Tejun Heo3373efd2006-05-15 20:57:53 +09001481 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001482}
1483
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001484static void ata_dev_config_ncq(struct ata_device *dev,
1485 char *desc, size_t desc_sz)
1486{
1487 struct ata_port *ap = dev->ap;
1488 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1489
1490 if (!ata_id_has_ncq(dev->id)) {
1491 desc[0] = '\0';
1492 return;
1493 }
Alan Cox6919a0a2006-10-27 19:08:46 -07001494 if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
1495 snprintf(desc, desc_sz, "NCQ (not used)");
1496 return;
1497 }
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001498 if (ap->flags & ATA_FLAG_NCQ) {
Jeff Garzikcca39742006-08-24 03:19:22 -04001499 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001500 dev->flags |= ATA_DFLAG_NCQ;
1501 }
1502
1503 if (hdepth >= ddepth)
1504 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1505 else
1506 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1507}
1508
Brian Kinge6d902a2006-06-28 08:30:31 -05001509static void ata_set_port_max_cmd_len(struct ata_port *ap)
1510{
1511 int i;
1512
Jeff Garzikcca39742006-08-24 03:19:22 -04001513 if (ap->scsi_host) {
1514 unsigned int len = 0;
1515
Brian Kinge6d902a2006-06-28 08:30:31 -05001516 for (i = 0; i < ATA_MAX_DEVICES; i++)
Jeff Garzikcca39742006-08-24 03:19:22 -04001517 len = max(len, ap->device[i].cdb_len);
1518
1519 ap->scsi_host->max_cmd_len = len;
Brian Kinge6d902a2006-06-28 08:30:31 -05001520 }
1521}
1522
Tejun Heo49016ac2006-02-21 02:12:11 +09001523/**
Tejun Heoffeae412006-03-01 16:09:35 +09001524 * ata_dev_configure - Configure the specified ATA/ATAPI device
Tejun Heoffeae412006-03-01 16:09:35 +09001525 * @dev: Target device to configure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 *
Tejun Heoffeae412006-03-01 16:09:35 +09001527 * Configure @dev according to @dev->id. Generic and low-level
1528 * driver specific fixups are also applied.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 *
1530 * LOCKING:
Tejun Heoffeae412006-03-01 16:09:35 +09001531 * Kernel thread context (may sleep)
1532 *
1533 * RETURNS:
1534 * 0 on success, -errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 */
Tejun Heoefdaedc2006-11-01 18:38:52 +09001536int ata_dev_configure(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537{
Tejun Heo3373efd2006-05-15 20:57:53 +09001538 struct ata_port *ap = dev->ap;
Tejun Heoefdaedc2006-11-01 18:38:52 +09001539 int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001540 const u16 *id = dev->id;
Tejun Heoff8854b2006-03-06 04:31:56 +09001541 unsigned int xfer_mask;
Alan Coxb352e572006-08-10 18:52:12 +01001542 char revbuf[7]; /* XYZ-99\0 */
Brian Kinge6d902a2006-06-28 08:30:31 -05001543 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001545 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
Tejun Heo88574552006-06-25 20:00:35 +09001546 ata_dev_printk(dev, KERN_INFO,
1547 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1548 __FUNCTION__, ap->id, dev->devno);
Tejun Heoffeae412006-03-01 16:09:35 +09001549 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 }
1551
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001552 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001553 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
1554 __FUNCTION__, ap->id, dev->devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001556 /* print device capabilities */
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001557 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001558 ata_dev_printk(dev, KERN_DEBUG,
1559 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1560 "85:%04x 86:%04x 87:%04x 88:%04x\n",
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001561 __FUNCTION__,
Tejun Heof15a1da2006-05-15 20:57:56 +09001562 id[49], id[82], id[83], id[84],
1563 id[85], id[86], id[87], id[88]);
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001564
Tejun Heo208a9932006-03-05 17:55:58 +09001565 /* initialize to-be-configured parameters */
Tejun Heoea1dd4e2006-04-02 18:51:53 +09001566 dev->flags &= ~ATA_DFLAG_CFG_MASK;
Tejun Heo208a9932006-03-05 17:55:58 +09001567 dev->max_sectors = 0;
1568 dev->cdb_len = 0;
1569 dev->n_sectors = 0;
1570 dev->cylinders = 0;
1571 dev->heads = 0;
1572 dev->sectors = 0;
1573
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 /*
1575 * common ATA, ATAPI feature tests
1576 */
1577
Tejun Heoff8854b2006-03-06 04:31:56 +09001578 /* find max transfer mode; for printk only */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001579 xfer_mask = ata_id_xfermask(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001581 if (ata_msg_probe(ap))
1582 ata_dump_id(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
1584 /* ATA-specific feature tests */
1585 if (dev->class == ATA_DEV_ATA) {
Alan Coxb352e572006-08-10 18:52:12 +01001586 if (ata_id_is_cfa(id)) {
1587 if (id[162] & 1) /* CPRM may make this media unusable */
1588 ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u supports DRM functions and may not be fully accessable.\n",
1589 ap->id, dev->devno);
1590 snprintf(revbuf, 7, "CFA");
1591 }
1592 else
1593 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
1594
Tejun Heo1148c3a2006-03-13 19:48:04 +09001595 dev->n_sectors = ata_id_n_sectors(id);
Tejun Heo29407402006-02-12 22:47:04 +09001596
Tejun Heo1148c3a2006-03-13 19:48:04 +09001597 if (ata_id_has_lba(id)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001598 const char *lba_desc;
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001599 char ncq_desc[20];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001600
Tejun Heo4c2d7212006-03-05 17:55:58 +09001601 lba_desc = "LBA";
1602 dev->flags |= ATA_DFLAG_LBA;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001603 if (ata_id_has_lba48(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001604 dev->flags |= ATA_DFLAG_LBA48;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001605 lba_desc = "LBA48";
Tejun Heo6fc49ad2006-11-11 20:10:45 +09001606
1607 if (dev->n_sectors >= (1UL << 28) &&
1608 ata_id_has_flush_ext(id))
1609 dev->flags |= ATA_DFLAG_FLUSH_EXT;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001610 }
Albert Lee8bf62ece2005-05-12 15:29:42 -04001611
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001612 /* config NCQ */
1613 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1614
Albert Lee8bf62ece2005-05-12 15:29:42 -04001615 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001616 if (ata_msg_drv(ap) && print_info)
Alan Coxb352e572006-08-10 18:52:12 +01001617 ata_dev_printk(dev, KERN_INFO, "%s, "
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001618 "max %s, %Lu sectors: %s %s\n",
Alan Coxb352e572006-08-10 18:52:12 +01001619 revbuf,
Tejun Heof15a1da2006-05-15 20:57:56 +09001620 ata_mode_string(xfer_mask),
1621 (unsigned long long)dev->n_sectors,
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001622 lba_desc, ncq_desc);
Tejun Heoffeae412006-03-01 16:09:35 +09001623 } else {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001624 /* CHS */
1625
1626 /* Default translation */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001627 dev->cylinders = id[1];
1628 dev->heads = id[3];
1629 dev->sectors = id[6];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001630
Tejun Heo1148c3a2006-03-13 19:48:04 +09001631 if (ata_id_current_chs_valid(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001632 /* Current CHS translation is valid. */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001633 dev->cylinders = id[54];
1634 dev->heads = id[55];
1635 dev->sectors = id[56];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001636 }
1637
1638 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001639 if (ata_msg_drv(ap) && print_info)
Alan Coxb352e572006-08-10 18:52:12 +01001640 ata_dev_printk(dev, KERN_INFO, "%s, "
Tejun Heof15a1da2006-05-15 20:57:56 +09001641 "max %s, %Lu sectors: CHS %u/%u/%u\n",
Alan Coxb352e572006-08-10 18:52:12 +01001642 revbuf,
Tejun Heof15a1da2006-05-15 20:57:56 +09001643 ata_mode_string(xfer_mask),
1644 (unsigned long long)dev->n_sectors,
Tejun Heo88574552006-06-25 20:00:35 +09001645 dev->cylinders, dev->heads,
1646 dev->sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 }
1648
Albert Lee07f6f7d2005-11-01 19:33:20 +08001649 if (dev->id[59] & 0x100) {
1650 dev->multi_count = dev->id[59] & 0xff;
Borislav Petkov5afc8142006-06-27 14:51:25 +02001651 if (ata_msg_drv(ap) && print_info)
Tejun Heo88574552006-06-25 20:00:35 +09001652 ata_dev_printk(dev, KERN_INFO,
1653 "ata%u: dev %u multi count %u\n",
1654 ap->id, dev->devno, dev->multi_count);
Albert Lee07f6f7d2005-11-01 19:33:20 +08001655 }
1656
Tejun Heo6e7846e2006-02-12 23:32:58 +09001657 dev->cdb_len = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 }
1659
1660 /* ATAPI-specific feature tests */
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05001661 else if (dev->class == ATA_DEV_ATAPI) {
Albert Lee08a556d2006-03-31 13:29:04 +08001662 char *cdb_intr_string = "";
1663
Tejun Heo1148c3a2006-03-13 19:48:04 +09001664 rc = atapi_cdb_len(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001666 if (ata_msg_warn(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001667 ata_dev_printk(dev, KERN_WARNING,
1668 "unsupported CDB len\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001669 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 goto err_out_nosup;
1671 }
Tejun Heo6e7846e2006-02-12 23:32:58 +09001672 dev->cdb_len = (unsigned int) rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673
Albert Lee08a556d2006-03-31 13:29:04 +08001674 if (ata_id_cdb_intr(dev->id)) {
Albert Lee312f7da2005-09-27 17:38:03 +08001675 dev->flags |= ATA_DFLAG_CDB_INTR;
Albert Lee08a556d2006-03-31 13:29:04 +08001676 cdb_intr_string = ", CDB intr";
1677 }
Albert Lee312f7da2005-09-27 17:38:03 +08001678
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 /* print device info to dmesg */
Borislav Petkov5afc8142006-06-27 14:51:25 +02001680 if (ata_msg_drv(ap) && print_info)
Tejun Heo12436c32006-05-15 20:59:15 +09001681 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
1682 ata_mode_string(xfer_mask),
1683 cdb_intr_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 }
1685
Tejun Heo914ed352006-11-01 18:39:55 +09001686 /* determine max_sectors */
1687 dev->max_sectors = ATA_MAX_SECTORS;
1688 if (dev->flags & ATA_DFLAG_LBA48)
1689 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
1690
Alan Cox93590852006-09-12 16:55:12 +01001691 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
1692 /* Let the user know. We don't want to disallow opens for
1693 rescue purposes, or in case the vendor is just a blithering
1694 idiot */
1695 if (print_info) {
1696 ata_dev_printk(dev, KERN_WARNING,
1697"Drive reports diagnostics failure. This may indicate a drive\n");
1698 ata_dev_printk(dev, KERN_WARNING,
1699"fault or invalid emulation. Contact drive vendor for information.\n");
1700 }
1701 }
1702
Brian Kinge6d902a2006-06-28 08:30:31 -05001703 ata_set_port_max_cmd_len(ap);
Tejun Heo6e7846e2006-02-12 23:32:58 +09001704
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001705 /* limit bridge transfers to udma5, 200 sectors */
Tejun Heo3373efd2006-05-15 20:57:53 +09001706 if (ata_dev_knobble(dev)) {
Borislav Petkov5afc8142006-06-27 14:51:25 +02001707 if (ata_msg_drv(ap) && print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001708 ata_dev_printk(dev, KERN_INFO,
1709 "applying bridge limits\n");
Tejun Heo5a529132006-03-24 14:07:50 +09001710 dev->udma_mask &= ATA_UDMA5;
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001711 dev->max_sectors = ATA_MAX_SECTORS;
1712 }
1713
1714 if (ap->ops->dev_config)
1715 ap->ops->dev_config(ap, dev);
1716
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001717 if (ata_msg_probe(ap))
1718 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
1719 __FUNCTION__, ata_chk_status(ap));
Tejun Heoffeae412006-03-01 16:09:35 +09001720 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
1722err_out_nosup:
Borislav Petkov0dd4b212006-06-23 02:29:08 -04001723 if (ata_msg_probe(ap))
Tejun Heo88574552006-06-25 20:00:35 +09001724 ata_dev_printk(dev, KERN_DEBUG,
1725 "%s: EXIT, err\n", __FUNCTION__);
Tejun Heoffeae412006-03-01 16:09:35 +09001726 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727}
1728
1729/**
1730 * ata_bus_probe - Reset and probe ATA bus
1731 * @ap: Bus to probe
1732 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001733 * Master ATA bus probing function. Initiates a hardware-dependent
1734 * bus reset, then attempts to identify any devices found on
1735 * the bus.
1736 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001738 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 *
1740 * RETURNS:
Tejun Heo96072e62006-04-01 01:38:17 +09001741 * Zero on success, negative errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 */
1743
Brian King80289162006-08-07 14:27:31 -05001744int ata_bus_probe(struct ata_port *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745{
Tejun Heo28ca5c52006-03-01 16:09:36 +09001746 unsigned int classes[ATA_MAX_DEVICES];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001747 int tries[ATA_MAX_DEVICES];
1748 int i, rc, down_xfermask;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001749 struct ata_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
Tejun Heo28ca5c52006-03-01 16:09:36 +09001751 ata_port_probe(ap);
1752
Tejun Heo14d2bac2006-04-02 17:54:46 +09001753 for (i = 0; i < ATA_MAX_DEVICES; i++)
1754 tries[i] = ATA_PROBE_MAX_TRIES;
1755
1756 retry:
1757 down_xfermask = 0;
1758
Tejun Heo20444702006-03-13 01:57:01 +09001759 /* reset and determine device classes */
Tejun Heo52783c52006-05-31 18:28:22 +09001760 ap->ops->phy_reset(ap);
Tejun Heo2061a472006-03-12 00:57:39 +09001761
Tejun Heo52783c52006-05-31 18:28:22 +09001762 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1763 dev = &ap->device[i];
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001764
Tejun Heo52783c52006-05-31 18:28:22 +09001765 if (!(ap->flags & ATA_FLAG_DISABLED) &&
1766 dev->class != ATA_DEV_UNKNOWN)
1767 classes[dev->devno] = dev->class;
1768 else
1769 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heo20444702006-03-13 01:57:01 +09001770
Tejun Heo52783c52006-05-31 18:28:22 +09001771 dev->class = ATA_DEV_UNKNOWN;
Tejun Heo28ca5c52006-03-01 16:09:36 +09001772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Tejun Heo52783c52006-05-31 18:28:22 +09001774 ata_port_probe(ap);
Tejun Heo20444702006-03-13 01:57:01 +09001775
Alan Coxb6079ca2006-05-22 16:52:06 +01001776 /* after the reset the device state is PIO 0 and the controller
1777 state is undefined. Record the mode */
1778
1779 for (i = 0; i < ATA_MAX_DEVICES; i++)
1780 ap->device[i].pio_mode = XFER_PIO_0;
1781
Tejun Heo28ca5c52006-03-01 16:09:36 +09001782 /* read IDENTIFY page and configure devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001784 dev = &ap->device[i];
Tejun Heo28ca5c52006-03-01 16:09:36 +09001785
Tejun Heoec573752006-04-11 22:26:29 +09001786 if (tries[i])
1787 dev->class = classes[i];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001788
Tejun Heoe1211e32006-04-01 01:38:18 +09001789 if (!ata_dev_enabled(dev))
Tejun Heoffeae412006-03-01 16:09:35 +09001790 continue;
1791
Tejun Heobff04642006-11-10 18:08:10 +09001792 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
1793 dev->id);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001794 if (rc)
1795 goto fail;
Tejun Heoffeae412006-03-01 16:09:35 +09001796
Tejun Heoefdaedc2006-11-01 18:38:52 +09001797 ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
1798 rc = ata_dev_configure(dev);
1799 ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001800 if (rc)
1801 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 }
1803
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001804 /* configure transfer mode */
Tejun Heo3adcebb2006-05-15 20:57:37 +09001805 rc = ata_set_mode(ap, &dev);
Tejun Heo51713d32006-04-11 22:26:29 +09001806 if (rc) {
1807 down_xfermask = 1;
1808 goto fail;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001809 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001811 for (i = 0; i < ATA_MAX_DEVICES; i++)
1812 if (ata_dev_enabled(&ap->device[i]))
1813 return 0;
Alan Coxe35a9e02006-03-27 18:46:37 +01001814
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001815 /* no device present, disable port */
1816 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 ap->ops->port_disable(ap);
Tejun Heo96072e62006-04-01 01:38:17 +09001818 return -ENODEV;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001819
1820 fail:
1821 switch (rc) {
1822 case -EINVAL:
1823 case -ENODEV:
1824 tries[dev->devno] = 0;
1825 break;
1826 case -EIO:
Tejun Heo3c567b72006-05-15 20:57:23 +09001827 sata_down_spd_limit(ap);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001828 /* fall through */
1829 default:
1830 tries[dev->devno]--;
1831 if (down_xfermask &&
Tejun Heo3373efd2006-05-15 20:57:53 +09001832 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
Tejun Heo14d2bac2006-04-02 17:54:46 +09001833 tries[dev->devno] = 0;
1834 }
1835
Tejun Heoec573752006-04-11 22:26:29 +09001836 if (!tries[dev->devno]) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001837 ata_down_xfermask_limit(dev, 1);
1838 ata_dev_disable(dev);
Tejun Heoec573752006-04-11 22:26:29 +09001839 }
1840
Tejun Heo14d2bac2006-04-02 17:54:46 +09001841 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842}
1843
1844/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001845 * ata_port_probe - Mark port as enabled
1846 * @ap: Port for which we indicate enablement
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001848 * Modify @ap data structure such that the system
1849 * thinks that the entire port is enabled.
1850 *
Jeff Garzikcca39742006-08-24 03:19:22 -04001851 * LOCKING: host lock, or some other form of
Jeff Garzik0cba6322005-05-30 19:49:12 -04001852 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 */
1854
1855void ata_port_probe(struct ata_port *ap)
1856{
Tejun Heo198e0fe2006-04-02 18:51:52 +09001857 ap->flags &= ~ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858}
1859
1860/**
Tejun Heo3be680b2005-12-19 22:35:02 +09001861 * sata_print_link_status - Print SATA link status
1862 * @ap: SATA port to printk link status about
1863 *
1864 * This function prints link speed and status of a SATA link.
1865 *
1866 * LOCKING:
1867 * None.
1868 */
1869static void sata_print_link_status(struct ata_port *ap)
1870{
Tejun Heo6d5f9732006-04-03 00:09:41 +09001871 u32 sstatus, scontrol, tmp;
Tejun Heo3be680b2005-12-19 22:35:02 +09001872
Tejun Heo81952c52006-05-15 20:57:47 +09001873 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
Tejun Heo3be680b2005-12-19 22:35:02 +09001874 return;
Tejun Heo81952c52006-05-15 20:57:47 +09001875 sata_scr_read(ap, SCR_CONTROL, &scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001876
Tejun Heo81952c52006-05-15 20:57:47 +09001877 if (ata_port_online(ap)) {
Tejun Heo3be680b2005-12-19 22:35:02 +09001878 tmp = (sstatus >> 4) & 0xf;
Tejun Heof15a1da2006-05-15 20:57:56 +09001879 ata_port_printk(ap, KERN_INFO,
1880 "SATA link up %s (SStatus %X SControl %X)\n",
1881 sata_spd_string(tmp), sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001882 } else {
Tejun Heof15a1da2006-05-15 20:57:56 +09001883 ata_port_printk(ap, KERN_INFO,
1884 "SATA link down (SStatus %X SControl %X)\n",
1885 sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001886 }
1887}
1888
1889/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001890 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1891 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001893 * This function issues commands to standard SATA Sxxx
1894 * PHY registers, to wake up the phy (and device), and
1895 * clear any reset condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 *
1897 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001898 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 *
1900 */
1901void __sata_phy_reset(struct ata_port *ap)
1902{
1903 u32 sstatus;
1904 unsigned long timeout = jiffies + (HZ * 5);
1905
1906 if (ap->flags & ATA_FLAG_SATA_RESET) {
Brett Russcdcca89e2005-03-28 15:10:27 -05001907 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09001908 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
Tejun Heo62ba2842005-06-26 23:27:19 +09001909 /* Couldn't find anything in SATA I/II specs, but
1910 * AHCI-1.1 10.4.2 says at least 1 ms. */
1911 mdelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 }
Tejun Heo81952c52006-05-15 20:57:47 +09001913 /* phy wake/clear reset */
1914 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
1916 /* wait for phy to become ready, if necessary */
1917 do {
1918 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09001919 sata_scr_read(ap, SCR_STATUS, &sstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 if ((sstatus & 0xf) != 1)
1921 break;
1922 } while (time_before(jiffies, timeout));
1923
Tejun Heo3be680b2005-12-19 22:35:02 +09001924 /* print link status */
1925 sata_print_link_status(ap);
Jeff Garzik656563e2005-11-20 03:36:45 -05001926
Tejun Heo3be680b2005-12-19 22:35:02 +09001927 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09001928 if (!ata_port_offline(ap))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 ata_port_probe(ap);
Tejun Heo3be680b2005-12-19 22:35:02 +09001930 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
Tejun Heo198e0fe2006-04-02 18:51:52 +09001933 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 return;
1935
1936 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1937 ata_port_disable(ap);
1938 return;
1939 }
1940
1941 ap->cbl = ATA_CBL_SATA;
1942}
1943
1944/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001945 * sata_phy_reset - Reset SATA bus.
1946 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001948 * This function resets the SATA bus, and then probes
1949 * the bus for devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 *
1951 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001952 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 *
1954 */
1955void sata_phy_reset(struct ata_port *ap)
1956{
1957 __sata_phy_reset(ap);
Tejun Heo198e0fe2006-04-02 18:51:52 +09001958 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 return;
1960 ata_bus_reset(ap);
1961}
1962
1963/**
Alan Coxebdfca62006-03-23 15:38:34 +00001964 * ata_dev_pair - return other device on cable
Alan Coxebdfca62006-03-23 15:38:34 +00001965 * @adev: device
1966 *
1967 * Obtain the other device on the same cable, or if none is
1968 * present NULL is returned
1969 */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001970
Tejun Heo3373efd2006-05-15 20:57:53 +09001971struct ata_device *ata_dev_pair(struct ata_device *adev)
Alan Coxebdfca62006-03-23 15:38:34 +00001972{
Tejun Heo3373efd2006-05-15 20:57:53 +09001973 struct ata_port *ap = adev->ap;
Alan Coxebdfca62006-03-23 15:38:34 +00001974 struct ata_device *pair = &ap->device[1 - adev->devno];
Tejun Heoe1211e32006-04-01 01:38:18 +09001975 if (!ata_dev_enabled(pair))
Alan Coxebdfca62006-03-23 15:38:34 +00001976 return NULL;
1977 return pair;
1978}
1979
1980/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001981 * ata_port_disable - Disable port.
1982 * @ap: Port to be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001984 * Modify @ap data structure such that the system
1985 * thinks that the entire port is disabled, and should
1986 * never attempt to probe or communicate with devices
1987 * on this port.
1988 *
Jeff Garzikcca39742006-08-24 03:19:22 -04001989 * LOCKING: host lock, or some other form of
Jeff Garzik780a87f2005-05-30 15:41:05 -04001990 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 */
1992
1993void ata_port_disable(struct ata_port *ap)
1994{
1995 ap->device[0].class = ATA_DEV_NONE;
1996 ap->device[1].class = ATA_DEV_NONE;
Tejun Heo198e0fe2006-04-02 18:51:52 +09001997 ap->flags |= ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998}
1999
Tejun Heo1c3fae42006-04-02 20:53:28 +09002000/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002001 * sata_down_spd_limit - adjust SATA spd limit downward
Tejun Heo1c3fae42006-04-02 20:53:28 +09002002 * @ap: Port to adjust SATA spd limit for
2003 *
2004 * Adjust SATA spd limit of @ap downward. Note that this
2005 * function only adjusts the limit. The change must be applied
Tejun Heo3c567b72006-05-15 20:57:23 +09002006 * using sata_set_spd().
Tejun Heo1c3fae42006-04-02 20:53:28 +09002007 *
2008 * LOCKING:
2009 * Inherited from caller.
2010 *
2011 * RETURNS:
2012 * 0 on success, negative errno on failure
2013 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002014int sata_down_spd_limit(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002015{
Tejun Heo81952c52006-05-15 20:57:47 +09002016 u32 sstatus, spd, mask;
2017 int rc, highbit;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002018
Tejun Heo81952c52006-05-15 20:57:47 +09002019 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
2020 if (rc)
2021 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002022
2023 mask = ap->sata_spd_limit;
2024 if (mask <= 1)
2025 return -EINVAL;
2026 highbit = fls(mask) - 1;
2027 mask &= ~(1 << highbit);
2028
Tejun Heo81952c52006-05-15 20:57:47 +09002029 spd = (sstatus >> 4) & 0xf;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002030 if (spd <= 1)
2031 return -EINVAL;
2032 spd--;
2033 mask &= (1 << spd) - 1;
2034 if (!mask)
2035 return -EINVAL;
2036
2037 ap->sata_spd_limit = mask;
2038
Tejun Heof15a1da2006-05-15 20:57:56 +09002039 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
2040 sata_spd_string(fls(mask)));
Tejun Heo1c3fae42006-04-02 20:53:28 +09002041
2042 return 0;
2043}
2044
Tejun Heo3c567b72006-05-15 20:57:23 +09002045static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002046{
2047 u32 spd, limit;
2048
2049 if (ap->sata_spd_limit == UINT_MAX)
2050 limit = 0;
2051 else
2052 limit = fls(ap->sata_spd_limit);
2053
2054 spd = (*scontrol >> 4) & 0xf;
2055 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
2056
2057 return spd != limit;
2058}
2059
2060/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002061 * sata_set_spd_needed - is SATA spd configuration needed
Tejun Heo1c3fae42006-04-02 20:53:28 +09002062 * @ap: Port in question
2063 *
2064 * Test whether the spd limit in SControl matches
2065 * @ap->sata_spd_limit. This function is used to determine
2066 * whether hardreset is necessary to apply SATA spd
2067 * configuration.
2068 *
2069 * LOCKING:
2070 * Inherited from caller.
2071 *
2072 * RETURNS:
2073 * 1 if SATA spd configuration is needed, 0 otherwise.
2074 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002075int sata_set_spd_needed(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002076{
2077 u32 scontrol;
2078
Tejun Heo81952c52006-05-15 20:57:47 +09002079 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09002080 return 0;
2081
Tejun Heo3c567b72006-05-15 20:57:23 +09002082 return __sata_set_spd_needed(ap, &scontrol);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002083}
2084
2085/**
Tejun Heo3c567b72006-05-15 20:57:23 +09002086 * sata_set_spd - set SATA spd according to spd limit
Tejun Heo1c3fae42006-04-02 20:53:28 +09002087 * @ap: Port to set SATA spd for
2088 *
2089 * Set SATA spd of @ap according to sata_spd_limit.
2090 *
2091 * LOCKING:
2092 * Inherited from caller.
2093 *
2094 * RETURNS:
2095 * 0 if spd doesn't need to be changed, 1 if spd has been
Tejun Heo81952c52006-05-15 20:57:47 +09002096 * changed. Negative errno if SCR registers are inaccessible.
Tejun Heo1c3fae42006-04-02 20:53:28 +09002097 */
Tejun Heo3c567b72006-05-15 20:57:23 +09002098int sata_set_spd(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09002099{
2100 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002101 int rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002102
Tejun Heo81952c52006-05-15 20:57:47 +09002103 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2104 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002105
Tejun Heo3c567b72006-05-15 20:57:23 +09002106 if (!__sata_set_spd_needed(ap, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09002107 return 0;
2108
Tejun Heo81952c52006-05-15 20:57:47 +09002109 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2110 return rc;
2111
Tejun Heo1c3fae42006-04-02 20:53:28 +09002112 return 1;
2113}
2114
Alan Cox452503f2005-10-21 19:01:32 -04002115/*
2116 * This mode timing computation functionality is ported over from
2117 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2118 */
2119/*
Alan Coxb352e572006-08-10 18:52:12 +01002120 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
Alan Cox452503f2005-10-21 19:01:32 -04002121 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
Alan Coxb352e572006-08-10 18:52:12 +01002122 * for UDMA6, which is currently supported only by Maxtor drives.
2123 *
2124 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
Alan Cox452503f2005-10-21 19:01:32 -04002125 */
2126
2127static const struct ata_timing ata_timing[] = {
2128
2129 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2130 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2131 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2132 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2133
Alan Coxb352e572006-08-10 18:52:12 +01002134 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2135 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
Alan Cox452503f2005-10-21 19:01:32 -04002136 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2137 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2138 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2139
2140/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002141
Alan Cox452503f2005-10-21 19:01:32 -04002142 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2143 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2144 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002145
Alan Cox452503f2005-10-21 19:01:32 -04002146 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2147 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2148 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2149
Alan Coxb352e572006-08-10 18:52:12 +01002150 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2151 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
Alan Cox452503f2005-10-21 19:01:32 -04002152 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2153 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2154
2155 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2156 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2157 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2158
2159/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2160
2161 { 0xFF }
2162};
2163
2164#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2165#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2166
2167static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2168{
2169 q->setup = EZ(t->setup * 1000, T);
2170 q->act8b = EZ(t->act8b * 1000, T);
2171 q->rec8b = EZ(t->rec8b * 1000, T);
2172 q->cyc8b = EZ(t->cyc8b * 1000, T);
2173 q->active = EZ(t->active * 1000, T);
2174 q->recover = EZ(t->recover * 1000, T);
2175 q->cycle = EZ(t->cycle * 1000, T);
2176 q->udma = EZ(t->udma * 1000, UT);
2177}
2178
2179void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2180 struct ata_timing *m, unsigned int what)
2181{
2182 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2183 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2184 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2185 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2186 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2187 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2188 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2189 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2190}
2191
2192static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
2193{
2194 const struct ata_timing *t;
2195
2196 for (t = ata_timing; t->mode != speed; t++)
Alan Cox91190752005-10-26 12:17:46 -04002197 if (t->mode == 0xFF)
Alan Cox452503f2005-10-21 19:01:32 -04002198 return NULL;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002199 return t;
Alan Cox452503f2005-10-21 19:01:32 -04002200}
2201
2202int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2203 struct ata_timing *t, int T, int UT)
2204{
2205 const struct ata_timing *s;
2206 struct ata_timing p;
2207
2208 /*
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002209 * Find the mode.
Albert Lee75b1f2f2005-11-16 17:06:18 +08002210 */
Alan Cox452503f2005-10-21 19:01:32 -04002211
2212 if (!(s = ata_timing_find_mode(speed)))
2213 return -EINVAL;
2214
Albert Lee75b1f2f2005-11-16 17:06:18 +08002215 memcpy(t, s, sizeof(*s));
2216
Alan Cox452503f2005-10-21 19:01:32 -04002217 /*
2218 * If the drive is an EIDE drive, it can tell us it needs extended
2219 * PIO/MW_DMA cycle timing.
2220 */
2221
2222 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2223 memset(&p, 0, sizeof(p));
2224 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2225 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2226 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2227 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2228 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2229 }
2230 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2231 }
2232
2233 /*
2234 * Convert the timing to bus clock counts.
2235 */
2236
Albert Lee75b1f2f2005-11-16 17:06:18 +08002237 ata_timing_quantize(t, t, T, UT);
Alan Cox452503f2005-10-21 19:01:32 -04002238
2239 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05002240 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2241 * S.M.A.R.T * and some other commands. We have to ensure that the
2242 * DMA cycle timing is slower/equal than the fastest PIO timing.
Alan Cox452503f2005-10-21 19:01:32 -04002243 */
2244
Alanfd3367af2006-12-07 12:41:18 +00002245 if (speed > XFER_PIO_6) {
Alan Cox452503f2005-10-21 19:01:32 -04002246 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2247 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2248 }
2249
2250 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05002251 * Lengthen active & recovery time so that cycle time is correct.
Alan Cox452503f2005-10-21 19:01:32 -04002252 */
2253
2254 if (t->act8b + t->rec8b < t->cyc8b) {
2255 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2256 t->rec8b = t->cyc8b - t->act8b;
2257 }
2258
2259 if (t->active + t->recover < t->cycle) {
2260 t->active += (t->cycle - (t->active + t->recover)) / 2;
2261 t->recover = t->cycle - t->active;
2262 }
2263
2264 return 0;
2265}
2266
Tejun Heocf176e12006-04-02 17:54:46 +09002267/**
2268 * ata_down_xfermask_limit - adjust dev xfer masks downward
Tejun Heocf176e12006-04-02 17:54:46 +09002269 * @dev: Device to adjust xfer masks
2270 * @force_pio0: Force PIO0
2271 *
2272 * Adjust xfer masks of @dev downward. Note that this function
2273 * does not apply the change. Invoking ata_set_mode() afterwards
2274 * will apply the limit.
2275 *
2276 * LOCKING:
2277 * Inherited from caller.
2278 *
2279 * RETURNS:
2280 * 0 on success, negative errno on failure
2281 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002282int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
Tejun Heocf176e12006-04-02 17:54:46 +09002283{
2284 unsigned long xfer_mask;
2285 int highbit;
2286
2287 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
2288 dev->udma_mask);
2289
2290 if (!xfer_mask)
2291 goto fail;
2292 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2293 if (xfer_mask & ATA_MASK_UDMA)
2294 xfer_mask &= ~ATA_MASK_MWDMA;
2295
2296 highbit = fls(xfer_mask) - 1;
2297 xfer_mask &= ~(1 << highbit);
2298 if (force_pio0)
2299 xfer_mask &= 1 << ATA_SHIFT_PIO;
2300 if (!xfer_mask)
2301 goto fail;
2302
2303 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2304 &dev->udma_mask);
2305
Tejun Heof15a1da2006-05-15 20:57:56 +09002306 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
2307 ata_mode_string(xfer_mask));
Tejun Heocf176e12006-04-02 17:54:46 +09002308
2309 return 0;
2310
2311 fail:
2312 return -EINVAL;
2313}
2314
Tejun Heo3373efd2006-05-15 20:57:53 +09002315static int ata_dev_set_mode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316{
Tejun Heobaa1e782006-11-01 18:39:27 +09002317 struct ata_eh_context *ehc = &dev->ap->eh_context;
Tejun Heo83206a22006-03-24 15:25:31 +09002318 unsigned int err_mask;
2319 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320
Tejun Heoe8384602006-04-02 18:51:53 +09002321 dev->flags &= ~ATA_DFLAG_PIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322 if (dev->xfer_shift == ATA_SHIFT_PIO)
2323 dev->flags |= ATA_DFLAG_PIO;
2324
Tejun Heo3373efd2006-05-15 20:57:53 +09002325 err_mask = ata_dev_set_xfermode(dev);
Tejun Heo83206a22006-03-24 15:25:31 +09002326 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002327 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2328 "(err_mask=0x%x)\n", err_mask);
Tejun Heo83206a22006-03-24 15:25:31 +09002329 return -EIO;
2330 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331
Tejun Heobaa1e782006-11-01 18:39:27 +09002332 ehc->i.flags |= ATA_EHI_POST_SETMODE;
Tejun Heo3373efd2006-05-15 20:57:53 +09002333 rc = ata_dev_revalidate(dev, 0);
Tejun Heobaa1e782006-11-01 18:39:27 +09002334 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
Tejun Heo5eb45c02006-04-02 18:51:52 +09002335 if (rc)
Tejun Heo83206a22006-03-24 15:25:31 +09002336 return rc;
Tejun Heo48a8a142006-03-05 17:55:58 +09002337
Tejun Heo23e71c32006-03-06 04:31:57 +09002338 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2339 dev->xfer_shift, (int)dev->xfer_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340
Tejun Heof15a1da2006-05-15 20:57:56 +09002341 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2342 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
Tejun Heo83206a22006-03-24 15:25:31 +09002343 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344}
2345
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346/**
2347 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2348 * @ap: port on which timings will be programmed
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002349 * @r_failed_dev: out paramter for failed device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 *
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002351 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2352 * ata_set_mode() fails, pointer to the failing device is
2353 * returned in @r_failed_dev.
Jeff Garzik780a87f2005-05-30 15:41:05 -04002354 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002356 * PCI/etc. bus probe sem.
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002357 *
2358 * RETURNS:
2359 * 0 on success, negative errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 */
Tejun Heo1ad8e7f2006-04-02 18:51:53 +09002361int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362{
Tejun Heoe8e06192006-04-01 01:38:18 +09002363 struct ata_device *dev;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002364 int i, rc = 0, used_dma = 0, found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365
Tejun Heo3adcebb2006-05-15 20:57:37 +09002366 /* has private set_mode? */
Alanb229a7b2007-01-24 11:47:07 +00002367 if (ap->ops->set_mode)
2368 return ap->ops->set_mode(ap, r_failed_dev);
Tejun Heo3adcebb2006-05-15 20:57:37 +09002369
Tejun Heoa6d5a512006-03-06 04:31:57 +09002370 /* step 1: calculate xfer_mask */
2371 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoacf356b2006-03-24 14:07:50 +09002372 unsigned int pio_mask, dma_mask;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002373
Tejun Heoe8e06192006-04-01 01:38:18 +09002374 dev = &ap->device[i];
2375
Tejun Heoe1211e32006-04-01 01:38:18 +09002376 if (!ata_dev_enabled(dev))
Tejun Heoa6d5a512006-03-06 04:31:57 +09002377 continue;
2378
Tejun Heo3373efd2006-05-15 20:57:53 +09002379 ata_dev_xfermask(dev);
Tejun Heoa6d5a512006-03-06 04:31:57 +09002380
Tejun Heoacf356b2006-03-24 14:07:50 +09002381 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2382 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2383 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2384 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
Alan Cox5444a6f2006-03-27 18:58:20 +01002385
Tejun Heo4f659772006-04-01 01:38:18 +09002386 found = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002387 if (dev->dma_mode)
2388 used_dma = 1;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002389 }
Tejun Heo4f659772006-04-01 01:38:18 +09002390 if (!found)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002391 goto out;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002392
2393 /* step 2: always set host PIO timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002394 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2395 dev = &ap->device[i];
2396 if (!ata_dev_enabled(dev))
2397 continue;
2398
2399 if (!dev->pio_mode) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002400 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
Tejun Heoe8e06192006-04-01 01:38:18 +09002401 rc = -EINVAL;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002402 goto out;
Tejun Heoe8e06192006-04-01 01:38:18 +09002403 }
2404
2405 dev->xfer_mode = dev->pio_mode;
2406 dev->xfer_shift = ATA_SHIFT_PIO;
2407 if (ap->ops->set_piomode)
2408 ap->ops->set_piomode(ap, dev);
2409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410
Tejun Heoa6d5a512006-03-06 04:31:57 +09002411 /* step 3: set host DMA timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002412 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2413 dev = &ap->device[i];
2414
2415 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2416 continue;
2417
2418 dev->xfer_mode = dev->dma_mode;
2419 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2420 if (ap->ops->set_dmamode)
2421 ap->ops->set_dmamode(ap, dev);
2422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423
2424 /* step 4: update devices' xfer mode */
Tejun Heo83206a22006-03-24 15:25:31 +09002425 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe8e06192006-04-01 01:38:18 +09002426 dev = &ap->device[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427
Alan18d90de2007-01-24 11:42:38 +00002428 /* don't update suspended devices' xfer mode */
Tejun Heo02670bf2006-07-03 16:07:26 +09002429 if (!ata_dev_ready(dev))
Tejun Heo83206a22006-03-24 15:25:31 +09002430 continue;
2431
Tejun Heo3373efd2006-05-15 20:57:53 +09002432 rc = ata_dev_set_mode(dev);
Tejun Heo5bbc53f2006-04-01 01:38:17 +09002433 if (rc)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002434 goto out;
Tejun Heo83206a22006-03-24 15:25:31 +09002435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436
Tejun Heoe8e06192006-04-01 01:38:18 +09002437 /* Record simplex status. If we selected DMA then the other
2438 * host channels are not permitted to do so.
Alan Cox5444a6f2006-03-27 18:58:20 +01002439 */
Jeff Garzikcca39742006-08-24 03:19:22 -04002440 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
2441 ap->host->simplex_claimed = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002442
Tejun Heoe8e06192006-04-01 01:38:18 +09002443 /* step5: chip specific finalisation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002444 if (ap->ops->post_set_mode)
2445 ap->ops->post_set_mode(ap);
2446
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002447 out:
2448 if (rc)
2449 *r_failed_dev = dev;
2450 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451}
2452
2453/**
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002454 * ata_tf_to_host - issue ATA taskfile to host controller
2455 * @ap: port to which command is being issued
2456 * @tf: ATA taskfile register set
2457 *
2458 * Issues ATA taskfile register set to ATA host controller,
2459 * with proper synchronization with interrupt handler and
2460 * other threads.
2461 *
2462 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04002463 * spin_lock_irqsave(host lock)
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002464 */
2465
2466static inline void ata_tf_to_host(struct ata_port *ap,
2467 const struct ata_taskfile *tf)
2468{
2469 ap->ops->tf_load(ap, tf);
2470 ap->ops->exec_command(ap, tf);
2471}
2472
2473/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474 * ata_busy_sleep - sleep until BSY clears, or timeout
2475 * @ap: port containing status register to be polled
2476 * @tmout_pat: impatience timeout
2477 * @tmout: overall timeout
2478 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002479 * Sleep until ATA Status register bit BSY clears,
2480 * or a timeout occurs.
2481 *
Tejun Heod1adc1b2006-10-09 18:32:15 +09002482 * LOCKING:
2483 * Kernel thread context (may sleep).
2484 *
2485 * RETURNS:
2486 * 0 on success, -errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 */
Tejun Heod1adc1b2006-10-09 18:32:15 +09002488int ata_busy_sleep(struct ata_port *ap,
2489 unsigned long tmout_pat, unsigned long tmout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490{
2491 unsigned long timer_start, timeout;
2492 u8 status;
2493
2494 status = ata_busy_wait(ap, ATA_BUSY, 300);
2495 timer_start = jiffies;
2496 timeout = timer_start + tmout_pat;
Tejun Heod1adc1b2006-10-09 18:32:15 +09002497 while (status != 0xff && (status & ATA_BUSY) &&
2498 time_before(jiffies, timeout)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 msleep(50);
2500 status = ata_busy_wait(ap, ATA_BUSY, 3);
2501 }
2502
Tejun Heod1adc1b2006-10-09 18:32:15 +09002503 if (status != 0xff && (status & ATA_BUSY))
Tejun Heof15a1da2006-05-15 20:57:56 +09002504 ata_port_printk(ap, KERN_WARNING,
Jeff Garzik35aa7a42006-09-28 06:50:24 -04002505 "port is slow to respond, please be patient "
2506 "(Status 0x%x)\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507
2508 timeout = timer_start + tmout;
Tejun Heod1adc1b2006-10-09 18:32:15 +09002509 while (status != 0xff && (status & ATA_BUSY) &&
2510 time_before(jiffies, timeout)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 msleep(50);
2512 status = ata_chk_status(ap);
2513 }
2514
Tejun Heod1adc1b2006-10-09 18:32:15 +09002515 if (status == 0xff)
2516 return -ENODEV;
2517
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 if (status & ATA_BUSY) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002519 ata_port_printk(ap, KERN_ERR, "port failed to respond "
Jeff Garzik35aa7a42006-09-28 06:50:24 -04002520 "(%lu secs, Status 0x%x)\n",
2521 tmout / HZ, status);
Tejun Heod1adc1b2006-10-09 18:32:15 +09002522 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002523 }
2524
2525 return 0;
2526}
2527
2528static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2529{
2530 struct ata_ioports *ioaddr = &ap->ioaddr;
2531 unsigned int dev0 = devmask & (1 << 0);
2532 unsigned int dev1 = devmask & (1 << 1);
2533 unsigned long timeout;
2534
2535 /* if device 0 was found in ata_devchk, wait for its
2536 * BSY bit to clear
2537 */
2538 if (dev0)
2539 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2540
2541 /* if device 1 was found in ata_devchk, wait for
2542 * register access, then wait for BSY to clear
2543 */
2544 timeout = jiffies + ATA_TMOUT_BOOT;
2545 while (dev1) {
2546 u8 nsect, lbal;
2547
2548 ap->ops->dev_select(ap, 1);
Tejun Heo0d5ff562007-02-01 15:06:36 +09002549 nsect = ioread8(ioaddr->nsect_addr);
2550 lbal = ioread8(ioaddr->lbal_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002551 if ((nsect == 1) && (lbal == 1))
2552 break;
2553 if (time_after(jiffies, timeout)) {
2554 dev1 = 0;
2555 break;
2556 }
2557 msleep(50); /* give drive a breather */
2558 }
2559 if (dev1)
2560 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2561
2562 /* is all this really necessary? */
2563 ap->ops->dev_select(ap, 0);
2564 if (dev1)
2565 ap->ops->dev_select(ap, 1);
2566 if (dev0)
2567 ap->ops->dev_select(ap, 0);
2568}
2569
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570static unsigned int ata_bus_softreset(struct ata_port *ap,
2571 unsigned int devmask)
2572{
2573 struct ata_ioports *ioaddr = &ap->ioaddr;
2574
2575 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2576
2577 /* software reset. causes dev0 to be selected */
Tejun Heo0d5ff562007-02-01 15:06:36 +09002578 iowrite8(ap->ctl, ioaddr->ctl_addr);
2579 udelay(20); /* FIXME: flush */
2580 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2581 udelay(20); /* FIXME: flush */
2582 iowrite8(ap->ctl, ioaddr->ctl_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583
2584 /* spec mandates ">= 2ms" before checking status.
2585 * We wait 150ms, because that was the magic delay used for
2586 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2587 * between when the ATA command register is written, and then
2588 * status is checked. Because waiting for "a while" before
2589 * checking status is fine, post SRST, we perform this magic
2590 * delay here as well.
Alan Cox09c7ad72006-03-22 15:52:40 +00002591 *
2592 * Old drivers/ide uses the 2mS rule and then waits for ready
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593 */
2594 msleep(150);
2595
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002596 /* Before we perform post reset processing we want to see if
Tejun Heo298a41c2006-03-25 02:58:13 +09002597 * the bus shows 0xFF because the odd clown forgets the D7
2598 * pulldown resistor.
2599 */
Tejun Heod1adc1b2006-10-09 18:32:15 +09002600 if (ata_check_status(ap) == 0xFF)
2601 return 0;
Alan Cox09c7ad72006-03-22 15:52:40 +00002602
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 ata_bus_post_reset(ap, devmask);
2604
2605 return 0;
2606}
2607
2608/**
2609 * ata_bus_reset - reset host port and associated ATA channel
2610 * @ap: port to reset
2611 *
2612 * This is typically the first time we actually start issuing
2613 * commands to the ATA channel. We wait for BSY to clear, then
2614 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2615 * result. Determine what devices, if any, are on the channel
2616 * by looking at the device 0/1 error register. Look at the signature
2617 * stored in each device's taskfile registers, to determine if
2618 * the device is ATA or ATAPI.
2619 *
2620 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002621 * PCI/etc. bus probe sem.
Jeff Garzikcca39742006-08-24 03:19:22 -04002622 * Obtains host lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002623 *
2624 * SIDE EFFECTS:
Tejun Heo198e0fe2006-04-02 18:51:52 +09002625 * Sets ATA_FLAG_DISABLED if bus reset fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 */
2627
2628void ata_bus_reset(struct ata_port *ap)
2629{
2630 struct ata_ioports *ioaddr = &ap->ioaddr;
2631 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2632 u8 err;
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002633 unsigned int dev0, dev1 = 0, devmask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634
2635 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2636
2637 /* determine if device 0/1 are present */
2638 if (ap->flags & ATA_FLAG_SATA_RESET)
2639 dev0 = 1;
2640 else {
2641 dev0 = ata_devchk(ap, 0);
2642 if (slave_possible)
2643 dev1 = ata_devchk(ap, 1);
2644 }
2645
2646 if (dev0)
2647 devmask |= (1 << 0);
2648 if (dev1)
2649 devmask |= (1 << 1);
2650
2651 /* select device 0 again */
2652 ap->ops->dev_select(ap, 0);
2653
2654 /* issue bus reset */
2655 if (ap->flags & ATA_FLAG_SRST)
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002656 if (ata_bus_softreset(ap, devmask))
2657 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658
2659 /*
2660 * determine by signature whether we have ATA or ATAPI devices
2661 */
Tejun Heob4dc7622006-01-24 17:05:22 +09002662 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663 if ((slave_possible) && (err != 0x81))
Tejun Heob4dc7622006-01-24 17:05:22 +09002664 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665
2666 /* re-enable interrupts */
2667 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2668 ata_irq_on(ap);
2669
2670 /* is double-select really necessary? */
2671 if (ap->device[1].class != ATA_DEV_NONE)
2672 ap->ops->dev_select(ap, 1);
2673 if (ap->device[0].class != ATA_DEV_NONE)
2674 ap->ops->dev_select(ap, 0);
2675
2676 /* if no devices were detected, disable this port */
2677 if ((ap->device[0].class == ATA_DEV_NONE) &&
2678 (ap->device[1].class == ATA_DEV_NONE))
2679 goto err_out;
2680
2681 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2682 /* set up device control for ATA_FLAG_SATA_RESET */
Tejun Heo0d5ff562007-02-01 15:06:36 +09002683 iowrite8(ap->ctl, ioaddr->ctl_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 }
2685
2686 DPRINTK("EXIT\n");
2687 return;
2688
2689err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09002690 ata_port_printk(ap, KERN_ERR, "disabling port\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 ap->ops->port_disable(ap);
2692
2693 DPRINTK("EXIT\n");
2694}
2695
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002696/**
2697 * sata_phy_debounce - debounce SATA phy status
2698 * @ap: ATA port to debounce SATA phy status for
2699 * @params: timing parameters { interval, duratinon, timeout } in msec
2700 *
2701 * Make sure SStatus of @ap reaches stable state, determined by
2702 * holding the same value where DET is not 1 for @duration polled
2703 * every @interval, before @timeout. Timeout constraints the
2704 * beginning of the stable state. Because, after hot unplugging,
2705 * DET gets stuck at 1 on some controllers, this functions waits
2706 * until timeout then returns 0 if DET is stable at 1.
2707 *
2708 * LOCKING:
2709 * Kernel thread context (may sleep)
2710 *
2711 * RETURNS:
2712 * 0 on success, -errno on failure.
2713 */
2714int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
Tejun Heo7a7921e2006-02-02 18:20:00 +09002715{
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002716 unsigned long interval_msec = params[0];
2717 unsigned long duration = params[1] * HZ / 1000;
2718 unsigned long timeout = jiffies + params[2] * HZ / 1000;
2719 unsigned long last_jiffies;
2720 u32 last, cur;
2721 int rc;
2722
2723 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
2724 return rc;
2725 cur &= 0xf;
2726
2727 last = cur;
2728 last_jiffies = jiffies;
2729
2730 while (1) {
2731 msleep(interval_msec);
2732 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
2733 return rc;
2734 cur &= 0xf;
2735
2736 /* DET stable? */
2737 if (cur == last) {
2738 if (cur == 1 && time_before(jiffies, timeout))
2739 continue;
2740 if (time_after(jiffies, last_jiffies + duration))
2741 return 0;
2742 continue;
2743 }
2744
2745 /* unstable, start over */
2746 last = cur;
2747 last_jiffies = jiffies;
2748
2749 /* check timeout */
2750 if (time_after(jiffies, timeout))
2751 return -EBUSY;
2752 }
2753}
2754
2755/**
2756 * sata_phy_resume - resume SATA phy
2757 * @ap: ATA port to resume SATA phy for
2758 * @params: timing parameters { interval, duratinon, timeout } in msec
2759 *
2760 * Resume SATA phy of @ap and debounce it.
2761 *
2762 * LOCKING:
2763 * Kernel thread context (may sleep)
2764 *
2765 * RETURNS:
2766 * 0 on success, -errno on failure.
2767 */
2768int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
2769{
2770 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002771 int rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002772
Tejun Heo81952c52006-05-15 20:57:47 +09002773 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2774 return rc;
2775
Tejun Heo852ee162006-04-01 01:38:18 +09002776 scontrol = (scontrol & 0x0f0) | 0x300;
Tejun Heo81952c52006-05-15 20:57:47 +09002777
2778 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2779 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002780
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002781 /* Some PHYs react badly if SStatus is pounded immediately
2782 * after resuming. Delay 200ms before debouncing.
2783 */
2784 msleep(200);
Tejun Heo7a7921e2006-02-02 18:20:00 +09002785
Tejun Heod7bb4cc2006-05-31 18:27:46 +09002786 return sata_phy_debounce(ap, params);
Tejun Heo7a7921e2006-02-02 18:20:00 +09002787}
2788
Tejun Heof5914a42006-05-31 18:27:48 +09002789static void ata_wait_spinup(struct ata_port *ap)
2790{
2791 struct ata_eh_context *ehc = &ap->eh_context;
2792 unsigned long end, secs;
2793 int rc;
2794
2795 /* first, debounce phy if SATA */
2796 if (ap->cbl == ATA_CBL_SATA) {
Tejun Heoe9c83912006-07-03 16:07:26 +09002797 rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
Tejun Heof5914a42006-05-31 18:27:48 +09002798
2799 /* if debounced successfully and offline, no need to wait */
2800 if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
2801 return;
2802 }
2803
2804 /* okay, let's give the drive time to spin up */
2805 end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
2806 secs = ((end - jiffies) + HZ - 1) / HZ;
2807
2808 if (time_after(jiffies, end))
2809 return;
2810
2811 if (secs > 5)
2812 ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
2813 "(%lu secs)\n", secs);
2814
2815 schedule_timeout_uninterruptible(end - jiffies);
2816}
2817
2818/**
2819 * ata_std_prereset - prepare for reset
2820 * @ap: ATA port to be reset
2821 *
2822 * @ap is about to be reset. Initialize it.
2823 *
2824 * LOCKING:
2825 * Kernel thread context (may sleep)
2826 *
2827 * RETURNS:
2828 * 0 on success, -errno otherwise.
2829 */
2830int ata_std_prereset(struct ata_port *ap)
2831{
2832 struct ata_eh_context *ehc = &ap->eh_context;
Tejun Heoe9c83912006-07-03 16:07:26 +09002833 const unsigned long *timing = sata_ehc_deb_timing(ehc);
Tejun Heof5914a42006-05-31 18:27:48 +09002834 int rc;
2835
Tejun Heo28324302006-07-03 16:07:26 +09002836 /* handle link resume & hotplug spinup */
2837 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
2838 (ap->flags & ATA_FLAG_HRST_TO_RESUME))
2839 ehc->i.action |= ATA_EH_HARDRESET;
2840
2841 if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
2842 (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
2843 ata_wait_spinup(ap);
Tejun Heof5914a42006-05-31 18:27:48 +09002844
2845 /* if we're about to do hardreset, nothing more to do */
2846 if (ehc->i.action & ATA_EH_HARDRESET)
2847 return 0;
2848
2849 /* if SATA, resume phy */
2850 if (ap->cbl == ATA_CBL_SATA) {
Tejun Heof5914a42006-05-31 18:27:48 +09002851 rc = sata_phy_resume(ap, timing);
2852 if (rc && rc != -EOPNOTSUPP) {
2853 /* phy resume failed */
2854 ata_port_printk(ap, KERN_WARNING, "failed to resume "
2855 "link for reset (errno=%d)\n", rc);
2856 return rc;
2857 }
2858 }
2859
2860 /* Wait for !BSY if the controller can wait for the first D2H
2861 * Reg FIS and we don't know that no device is attached.
2862 */
2863 if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
2864 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2865
2866 return 0;
2867}
2868
Tejun Heoc2bd5802006-01-24 17:05:22 +09002869/**
2870 * ata_std_softreset - reset host port via ATA SRST
2871 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002872 * @classes: resulting classes of attached devices
2873 *
Tejun Heo52783c52006-05-31 18:28:22 +09002874 * Reset host port using ATA SRST.
Tejun Heoc2bd5802006-01-24 17:05:22 +09002875 *
2876 * LOCKING:
2877 * Kernel thread context (may sleep)
2878 *
2879 * RETURNS:
2880 * 0 on success, -errno otherwise.
2881 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002882int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002883{
2884 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2885 unsigned int devmask = 0, err_mask;
2886 u8 err;
2887
2888 DPRINTK("ENTER\n");
2889
Tejun Heo81952c52006-05-15 20:57:47 +09002890 if (ata_port_offline(ap)) {
Tejun Heo3a397462006-02-10 23:58:48 +09002891 classes[0] = ATA_DEV_NONE;
2892 goto out;
2893 }
2894
Tejun Heoc2bd5802006-01-24 17:05:22 +09002895 /* determine if device 0/1 are present */
2896 if (ata_devchk(ap, 0))
2897 devmask |= (1 << 0);
2898 if (slave_possible && ata_devchk(ap, 1))
2899 devmask |= (1 << 1);
2900
Tejun Heoc2bd5802006-01-24 17:05:22 +09002901 /* select device 0 again */
2902 ap->ops->dev_select(ap, 0);
2903
2904 /* issue bus reset */
2905 DPRINTK("about to softreset, devmask=%x\n", devmask);
2906 err_mask = ata_bus_softreset(ap, devmask);
2907 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002908 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2909 err_mask);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002910 return -EIO;
2911 }
2912
2913 /* determine by signature whether we have ATA or ATAPI devices */
2914 classes[0] = ata_dev_try_classify(ap, 0, &err);
2915 if (slave_possible && err != 0x81)
2916 classes[1] = ata_dev_try_classify(ap, 1, &err);
2917
Tejun Heo3a397462006-02-10 23:58:48 +09002918 out:
Tejun Heoc2bd5802006-01-24 17:05:22 +09002919 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2920 return 0;
2921}
2922
2923/**
Tejun Heob6103f62006-11-01 17:59:53 +09002924 * sata_port_hardreset - reset port via SATA phy reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002925 * @ap: port to reset
Tejun Heob6103f62006-11-01 17:59:53 +09002926 * @timing: timing parameters { interval, duratinon, timeout } in msec
Tejun Heoc2bd5802006-01-24 17:05:22 +09002927 *
2928 * SATA phy-reset host port using DET bits of SControl register.
Tejun Heoc2bd5802006-01-24 17:05:22 +09002929 *
2930 * LOCKING:
2931 * Kernel thread context (may sleep)
2932 *
2933 * RETURNS:
2934 * 0 on success, -errno otherwise.
2935 */
Tejun Heob6103f62006-11-01 17:59:53 +09002936int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002937{
Tejun Heo852ee162006-04-01 01:38:18 +09002938 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002939 int rc;
Tejun Heo852ee162006-04-01 01:38:18 +09002940
Tejun Heoc2bd5802006-01-24 17:05:22 +09002941 DPRINTK("ENTER\n");
2942
Tejun Heo3c567b72006-05-15 20:57:23 +09002943 if (sata_set_spd_needed(ap)) {
Tejun Heo1c3fae42006-04-02 20:53:28 +09002944 /* SATA spec says nothing about how to reconfigure
2945 * spd. To be on the safe side, turn off phy during
2946 * reconfiguration. This works for at least ICH7 AHCI
2947 * and Sil3124.
2948 */
Tejun Heo81952c52006-05-15 20:57:47 +09002949 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09002950 goto out;
Tejun Heo81952c52006-05-15 20:57:47 +09002951
Martin Hicksa34b6fc2006-07-05 15:06:13 -04002952 scontrol = (scontrol & 0x0f0) | 0x304;
Tejun Heo81952c52006-05-15 20:57:47 +09002953
2954 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09002955 goto out;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002956
Tejun Heo3c567b72006-05-15 20:57:23 +09002957 sata_set_spd(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002958 }
2959
2960 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09002961 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09002962 goto out;
Tejun Heo81952c52006-05-15 20:57:47 +09002963
Tejun Heo852ee162006-04-01 01:38:18 +09002964 scontrol = (scontrol & 0x0f0) | 0x301;
Tejun Heo81952c52006-05-15 20:57:47 +09002965
2966 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
Tejun Heob6103f62006-11-01 17:59:53 +09002967 goto out;
Tejun Heoc2bd5802006-01-24 17:05:22 +09002968
Tejun Heo1c3fae42006-04-02 20:53:28 +09002969 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
Tejun Heoc2bd5802006-01-24 17:05:22 +09002970 * 10.4.2 says at least 1 ms.
2971 */
2972 msleep(1);
2973
Tejun Heo1c3fae42006-04-02 20:53:28 +09002974 /* bring phy back */
Tejun Heob6103f62006-11-01 17:59:53 +09002975 rc = sata_phy_resume(ap, timing);
2976 out:
2977 DPRINTK("EXIT, rc=%d\n", rc);
2978 return rc;
2979}
2980
2981/**
2982 * sata_std_hardreset - reset host port via SATA phy reset
2983 * @ap: port to reset
2984 * @class: resulting class of attached device
2985 *
2986 * SATA phy-reset host port using DET bits of SControl register,
2987 * wait for !BSY and classify the attached device.
2988 *
2989 * LOCKING:
2990 * Kernel thread context (may sleep)
2991 *
2992 * RETURNS:
2993 * 0 on success, -errno otherwise.
2994 */
2995int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2996{
2997 const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
2998 int rc;
2999
3000 DPRINTK("ENTER\n");
3001
3002 /* do hardreset */
3003 rc = sata_port_hardreset(ap, timing);
3004 if (rc) {
3005 ata_port_printk(ap, KERN_ERR,
3006 "COMRESET failed (errno=%d)\n", rc);
3007 return rc;
3008 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09003009
Tejun Heoc2bd5802006-01-24 17:05:22 +09003010 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09003011 if (ata_port_offline(ap)) {
Tejun Heoc2bd5802006-01-24 17:05:22 +09003012 *class = ATA_DEV_NONE;
3013 DPRINTK("EXIT, link offline\n");
3014 return 0;
3015 }
3016
3017 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003018 ata_port_printk(ap, KERN_ERR,
3019 "COMRESET failed (device not ready)\n");
Tejun Heoc2bd5802006-01-24 17:05:22 +09003020 return -EIO;
3021 }
3022
Tejun Heo3a397462006-02-10 23:58:48 +09003023 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3024
Tejun Heoc2bd5802006-01-24 17:05:22 +09003025 *class = ata_dev_try_classify(ap, 0, NULL);
3026
3027 DPRINTK("EXIT, class=%u\n", *class);
3028 return 0;
3029}
3030
3031/**
3032 * ata_std_postreset - standard postreset callback
3033 * @ap: the target ata_port
3034 * @classes: classes of attached devices
3035 *
3036 * This function is invoked after a successful reset. Note that
3037 * the device might have been reset more than once using
3038 * different reset methods before postreset is invoked.
Tejun Heoc2bd5802006-01-24 17:05:22 +09003039 *
Tejun Heoc2bd5802006-01-24 17:05:22 +09003040 * LOCKING:
3041 * Kernel thread context (may sleep)
3042 */
3043void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
3044{
Tejun Heodc2b3512006-05-15 20:58:00 +09003045 u32 serror;
3046
Tejun Heoc2bd5802006-01-24 17:05:22 +09003047 DPRINTK("ENTER\n");
3048
Tejun Heoc2bd5802006-01-24 17:05:22 +09003049 /* print link status */
Tejun Heo81952c52006-05-15 20:57:47 +09003050 sata_print_link_status(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09003051
Tejun Heodc2b3512006-05-15 20:58:00 +09003052 /* clear SError */
3053 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
3054 sata_scr_write(ap, SCR_ERROR, serror);
3055
Tejun Heo3a397462006-02-10 23:58:48 +09003056 /* re-enable interrupts */
Tejun Heoe3180492006-05-15 20:58:09 +09003057 if (!ap->ops->error_handler) {
3058 /* FIXME: hack. create a hook instead */
3059 if (ap->ioaddr.ctl_addr)
3060 ata_irq_on(ap);
3061 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09003062
3063 /* is double-select really necessary? */
3064 if (classes[0] != ATA_DEV_NONE)
3065 ap->ops->dev_select(ap, 1);
3066 if (classes[1] != ATA_DEV_NONE)
3067 ap->ops->dev_select(ap, 0);
3068
Tejun Heo3a397462006-02-10 23:58:48 +09003069 /* bail out if no device is present */
3070 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3071 DPRINTK("EXIT, no device\n");
3072 return;
3073 }
3074
3075 /* set up device control */
Tejun Heo0d5ff562007-02-01 15:06:36 +09003076 if (ap->ioaddr.ctl_addr)
3077 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
Tejun Heoc2bd5802006-01-24 17:05:22 +09003078
3079 DPRINTK("EXIT\n");
3080}
3081
Tejun Heoa62c0fc2006-01-24 17:05:22 +09003082/**
Tejun Heo623a3122006-03-05 17:55:58 +09003083 * ata_dev_same_device - Determine whether new ID matches configured device
Tejun Heo623a3122006-03-05 17:55:58 +09003084 * @dev: device to compare against
3085 * @new_class: class of the new device
3086 * @new_id: IDENTIFY page of the new device
3087 *
3088 * Compare @new_class and @new_id against @dev and determine
3089 * whether @dev is the device indicated by @new_class and
3090 * @new_id.
3091 *
3092 * LOCKING:
3093 * None.
3094 *
3095 * RETURNS:
3096 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3097 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003098static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3099 const u16 *new_id)
Tejun Heo623a3122006-03-05 17:55:58 +09003100{
3101 const u16 *old_id = dev->id;
Tejun Heoa0cf7332007-01-02 20:18:49 +09003102 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3103 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
Tejun Heo623a3122006-03-05 17:55:58 +09003104 u64 new_n_sectors;
3105
3106 if (dev->class != new_class) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003107 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3108 dev->class, new_class);
Tejun Heo623a3122006-03-05 17:55:58 +09003109 return 0;
3110 }
3111
Tejun Heoa0cf7332007-01-02 20:18:49 +09003112 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3113 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3114 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3115 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
Tejun Heo623a3122006-03-05 17:55:58 +09003116 new_n_sectors = ata_id_n_sectors(new_id);
3117
3118 if (strcmp(model[0], model[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003119 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3120 "'%s' != '%s'\n", model[0], model[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09003121 return 0;
3122 }
3123
3124 if (strcmp(serial[0], serial[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003125 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3126 "'%s' != '%s'\n", serial[0], serial[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09003127 return 0;
3128 }
3129
3130 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
Tejun Heof15a1da2006-05-15 20:57:56 +09003131 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3132 "%llu != %llu\n",
3133 (unsigned long long)dev->n_sectors,
3134 (unsigned long long)new_n_sectors);
Tejun Heo623a3122006-03-05 17:55:58 +09003135 return 0;
3136 }
3137
3138 return 1;
3139}
3140
3141/**
3142 * ata_dev_revalidate - Revalidate ATA device
Tejun Heo623a3122006-03-05 17:55:58 +09003143 * @dev: device to revalidate
Tejun Heobff04642006-11-10 18:08:10 +09003144 * @readid_flags: read ID flags
Tejun Heo623a3122006-03-05 17:55:58 +09003145 *
3146 * Re-read IDENTIFY page and make sure @dev is still attached to
3147 * the port.
3148 *
3149 * LOCKING:
3150 * Kernel thread context (may sleep)
3151 *
3152 * RETURNS:
3153 * 0 on success, negative errno otherwise
3154 */
Tejun Heobff04642006-11-10 18:08:10 +09003155int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
Tejun Heo623a3122006-03-05 17:55:58 +09003156{
Tejun Heo5eb45c02006-04-02 18:51:52 +09003157 unsigned int class = dev->class;
Tejun Heof15a1da2006-05-15 20:57:56 +09003158 u16 *id = (void *)dev->ap->sector_buf;
Tejun Heo623a3122006-03-05 17:55:58 +09003159 int rc;
3160
Tejun Heo5eb45c02006-04-02 18:51:52 +09003161 if (!ata_dev_enabled(dev)) {
3162 rc = -ENODEV;
3163 goto fail;
3164 }
Tejun Heo623a3122006-03-05 17:55:58 +09003165
Tejun Heofe635c72006-05-15 20:57:35 +09003166 /* read ID data */
Tejun Heobff04642006-11-10 18:08:10 +09003167 rc = ata_dev_read_id(dev, &class, readid_flags, id);
Tejun Heo623a3122006-03-05 17:55:58 +09003168 if (rc)
3169 goto fail;
3170
3171 /* is the device still there? */
Tejun Heo3373efd2006-05-15 20:57:53 +09003172 if (!ata_dev_same_device(dev, class, id)) {
Tejun Heo623a3122006-03-05 17:55:58 +09003173 rc = -ENODEV;
3174 goto fail;
3175 }
3176
Tejun Heofe635c72006-05-15 20:57:35 +09003177 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo623a3122006-03-05 17:55:58 +09003178
3179 /* configure device according to the new ID */
Tejun Heoefdaedc2006-11-01 18:38:52 +09003180 rc = ata_dev_configure(dev);
Tejun Heo5eb45c02006-04-02 18:51:52 +09003181 if (rc == 0)
3182 return 0;
Tejun Heo623a3122006-03-05 17:55:58 +09003183
3184 fail:
Tejun Heof15a1da2006-05-15 20:57:56 +09003185 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
Tejun Heo623a3122006-03-05 17:55:58 +09003186 return rc;
3187}
3188
Alan Cox6919a0a2006-10-27 19:08:46 -07003189struct ata_blacklist_entry {
3190 const char *model_num;
3191 const char *model_rev;
3192 unsigned long horkage;
3193};
3194
3195static const struct ata_blacklist_entry ata_device_blacklist [] = {
3196 /* Devices with DMA related problems under Linux */
3197 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3198 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3199 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3200 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3201 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3202 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3203 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3204 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3205 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3206 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3207 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3208 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3209 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3210 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3211 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3212 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3213 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3214 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3215 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3216 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3217 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3218 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3219 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3220 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3221 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3222 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3223 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3224 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3225 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3226 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
3227
3228 /* Devices we expect to fail diagnostics */
3229
3230 /* Devices where NCQ should be avoided */
3231 /* NCQ is slow */
3232 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3233
3234 /* Devices with NCQ limits */
3235
3236 /* End Marker */
3237 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238};
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05003239
Alan Cox6919a0a2006-10-27 19:08:46 -07003240unsigned long ata_device_blacklisted(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003241{
Tejun Heo8bfa79f2007-01-02 20:19:40 +09003242 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3243 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
Alan Cox6919a0a2006-10-27 19:08:46 -07003244 const struct ata_blacklist_entry *ad = ata_device_blacklist;
Albert Lee3a778272006-06-22 13:00:25 +08003245
Tejun Heo8bfa79f2007-01-02 20:19:40 +09003246 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3247 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003248
Alan Cox6919a0a2006-10-27 19:08:46 -07003249 while (ad->model_num) {
Tejun Heo8bfa79f2007-01-02 20:19:40 +09003250 if (!strcmp(ad->model_num, model_num)) {
Alan Cox6919a0a2006-10-27 19:08:46 -07003251 if (ad->model_rev == NULL)
3252 return ad->horkage;
Tejun Heo8bfa79f2007-01-02 20:19:40 +09003253 if (!strcmp(ad->model_rev, model_rev))
Alan Cox6919a0a2006-10-27 19:08:46 -07003254 return ad->horkage;
Alan Coxf4b15fe2006-03-22 15:54:04 +00003255 }
Alan Cox6919a0a2006-10-27 19:08:46 -07003256 ad++;
Alan Coxf4b15fe2006-03-22 15:54:04 +00003257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 return 0;
3259}
3260
Alan Cox6919a0a2006-10-27 19:08:46 -07003261static int ata_dma_blacklisted(const struct ata_device *dev)
3262{
3263 /* We don't support polling DMA.
3264 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3265 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3266 */
3267 if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
3268 (dev->flags & ATA_DFLAG_CDB_INTR))
3269 return 1;
3270 return (ata_device_blacklisted(dev) & ATA_HORKAGE_NODMA) ? 1 : 0;
3271}
3272
Tejun Heoa6d5a512006-03-06 04:31:57 +09003273/**
3274 * ata_dev_xfermask - Compute supported xfermask of the given device
Tejun Heoa6d5a512006-03-06 04:31:57 +09003275 * @dev: Device to compute xfermask for
3276 *
Tejun Heoacf356b2006-03-24 14:07:50 +09003277 * Compute supported xfermask of @dev and store it in
3278 * dev->*_mask. This function is responsible for applying all
3279 * known limits including host controller limits, device
3280 * blacklist, etc...
Tejun Heoa6d5a512006-03-06 04:31:57 +09003281 *
3282 * LOCKING:
3283 * None.
Tejun Heoa6d5a512006-03-06 04:31:57 +09003284 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003285static void ata_dev_xfermask(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286{
Tejun Heo3373efd2006-05-15 20:57:53 +09003287 struct ata_port *ap = dev->ap;
Jeff Garzikcca39742006-08-24 03:19:22 -04003288 struct ata_host *host = ap->host;
Tejun Heoa6d5a512006-03-06 04:31:57 +09003289 unsigned long xfer_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290
Tejun Heo37deecb2006-08-10 16:59:07 +09003291 /* controller modes available */
Tejun Heo565083e2006-04-02 17:54:47 +09003292 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3293 ap->mwdma_mask, ap->udma_mask);
3294
3295 /* Apply cable rule here. Don't apply it early because when
3296 * we handle hot plug the cable type can itself change.
3297 */
3298 if (ap->cbl == ATA_CBL_PATA40)
3299 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
Alan Coxfc085152006-10-10 14:28:11 -07003300 /* Apply drive side cable rule. Unknown or 80 pin cables reported
3301 * host side are checked drive side as well. Cases where we know a
3302 * 40wire cable is used safely for 80 are not checked here.
3303 */
3304 if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
3305 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3306
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307
Tejun Heo37deecb2006-08-10 16:59:07 +09003308 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
3309 dev->mwdma_mask, dev->udma_mask);
3310 xfer_mask &= ata_id_xfermask(dev->id);
Tejun Heo565083e2006-04-02 17:54:47 +09003311
Alan Coxb352e572006-08-10 18:52:12 +01003312 /*
3313 * CFA Advanced TrueIDE timings are not allowed on a shared
3314 * cable
3315 */
3316 if (ata_dev_pair(dev)) {
3317 /* No PIO5 or PIO6 */
3318 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
3319 /* No MWDMA3 or MWDMA 4 */
3320 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
3321 }
3322
Tejun Heo37deecb2006-08-10 16:59:07 +09003323 if (ata_dma_blacklisted(dev)) {
3324 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
Tejun Heof15a1da2006-05-15 20:57:56 +09003325 ata_dev_printk(dev, KERN_WARNING,
3326 "device is on DMA blacklist, disabling DMA\n");
Tejun Heo37deecb2006-08-10 16:59:07 +09003327 }
Tejun Heoa6d5a512006-03-06 04:31:57 +09003328
Jeff Garzikcca39742006-08-24 03:19:22 -04003329 if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
Tejun Heo37deecb2006-08-10 16:59:07 +09003330 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3331 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
3332 "other device, disabling DMA\n");
Alan Cox5444a6f2006-03-27 18:58:20 +01003333 }
Tejun Heo565083e2006-04-02 17:54:47 +09003334
Alan Cox5444a6f2006-03-27 18:58:20 +01003335 if (ap->ops->mode_filter)
3336 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
3337
Tejun Heo565083e2006-04-02 17:54:47 +09003338 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3339 &dev->mwdma_mask, &dev->udma_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003340}
3341
Linus Torvalds1da177e2005-04-16 15:20:36 -07003342/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07003343 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344 * @dev: Device to which command will be sent
3345 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003346 * Issue SET FEATURES - XFER MODE command to device @dev
3347 * on port @ap.
3348 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003350 * PCI/etc. bus probe sem.
Tejun Heo83206a22006-03-24 15:25:31 +09003351 *
3352 * RETURNS:
3353 * 0 on success, AC_ERR_* mask otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003354 */
3355
Tejun Heo3373efd2006-05-15 20:57:53 +09003356static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357{
Tejun Heoa0123702005-12-13 14:49:31 +09003358 struct ata_taskfile tf;
Tejun Heo83206a22006-03-24 15:25:31 +09003359 unsigned int err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360
3361 /* set up set-features taskfile */
3362 DPRINTK("set features - xfer mode\n");
3363
Tejun Heo3373efd2006-05-15 20:57:53 +09003364 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003365 tf.command = ATA_CMD_SET_FEATURES;
3366 tf.feature = SETFEATURES_XFER;
3367 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3368 tf.protocol = ATA_PROT_NODATA;
3369 tf.nsect = dev->xfer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003370
Tejun Heo3373efd2006-05-15 20:57:53 +09003371 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003372
Tejun Heo83206a22006-03-24 15:25:31 +09003373 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3374 return err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003375}
3376
3377/**
Albert Lee8bf62ece2005-05-12 15:29:42 -04003378 * ata_dev_init_params - Issue INIT DEV PARAMS command
Albert Lee8bf62ece2005-05-12 15:29:42 -04003379 * @dev: Device to which command will be sent
Randy Dunlape2a7f772006-05-18 10:50:18 -07003380 * @heads: Number of heads (taskfile parameter)
3381 * @sectors: Number of sectors (taskfile parameter)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003382 *
3383 * LOCKING:
Tejun Heo6aff8f12006-02-15 18:24:09 +09003384 * Kernel thread context (may sleep)
3385 *
3386 * RETURNS:
3387 * 0 on success, AC_ERR_* mask otherwise.
Albert Lee8bf62ece2005-05-12 15:29:42 -04003388 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003389static unsigned int ata_dev_init_params(struct ata_device *dev,
3390 u16 heads, u16 sectors)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003391{
Tejun Heoa0123702005-12-13 14:49:31 +09003392 struct ata_taskfile tf;
Tejun Heo6aff8f12006-02-15 18:24:09 +09003393 unsigned int err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003394
3395 /* Number of sectors per track 1-255. Number of heads 1-16 */
3396 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
Albert Lee00b6f5e2006-03-27 16:39:18 +08003397 return AC_ERR_INVALID;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003398
3399 /* set up init dev params taskfile */
3400 DPRINTK("init dev params \n");
3401
Tejun Heo3373efd2006-05-15 20:57:53 +09003402 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003403 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3404 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3405 tf.protocol = ATA_PROT_NODATA;
3406 tf.nsect = sectors;
3407 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
Albert Lee8bf62ece2005-05-12 15:29:42 -04003408
Tejun Heo3373efd2006-05-15 20:57:53 +09003409 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Albert Lee8bf62ece2005-05-12 15:29:42 -04003410
Tejun Heo6aff8f12006-02-15 18:24:09 +09003411 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3412 return err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003413}
3414
3415/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003416 * ata_sg_clean - Unmap DMA memory associated with command
3417 * @qc: Command containing DMA memory to be released
3418 *
3419 * Unmap all mapped DMA memory associated with this command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420 *
3421 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003422 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003423 */
Tejun Heo70e6ad02006-11-14 22:47:10 +09003424void ata_sg_clean(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425{
3426 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003427 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003429 void *pad_buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430
Tejun Heoa46314742006-02-11 19:11:13 +09003431 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3432 WARN_ON(sg == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003433
3434 if (qc->flags & ATA_QCFLAG_SINGLE)
Jeff Garzikf1318832006-02-20 16:55:56 -05003435 WARN_ON(qc->n_elem > 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05003437 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003438
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003439 /* if we padded the buffer out to 32-bit bound, and data
3440 * xfer direction is from-device, we must copy from the
3441 * pad buffer back into the supplied buffer
3442 */
3443 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3444 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3445
3446 if (qc->flags & ATA_QCFLAG_SG) {
Jeff Garzike1410f22005-11-14 14:06:26 -05003447 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003448 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003449 /* restore last sg */
3450 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3451 if (pad_buf) {
3452 struct scatterlist *psg = &qc->pad_sgent;
3453 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3454 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003455 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003456 }
3457 } else {
Tejun Heo2e242fa2006-02-20 23:48:38 +09003458 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003459 dma_unmap_single(ap->dev,
Jeff Garzike1410f22005-11-14 14:06:26 -05003460 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3461 dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003462 /* restore sg */
3463 sg->length += qc->pad_len;
3464 if (pad_buf)
3465 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3466 pad_buf, qc->pad_len);
3467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003468
3469 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003470 qc->__sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003471}
3472
3473/**
3474 * ata_fill_sg - Fill PCI IDE PRD table
3475 * @qc: Metadata associated with taskfile to be transferred
3476 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003477 * Fill PCI IDE PRD (scatter-gather) table with segments
3478 * associated with the current disk command.
3479 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003480 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003481 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003482 *
3483 */
3484static void ata_fill_sg(struct ata_queued_cmd *qc)
3485{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003487 struct scatterlist *sg;
3488 unsigned int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003489
Tejun Heoa46314742006-02-11 19:11:13 +09003490 WARN_ON(qc->__sg == NULL);
Jeff Garzikf1318832006-02-20 16:55:56 -05003491 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003492
3493 idx = 0;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003494 ata_for_each_sg(sg, qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003495 u32 addr, offset;
3496 u32 sg_len, len;
3497
3498 /* determine if physical DMA addr spans 64K boundary.
3499 * Note h/w doesn't support 64-bit, so we unconditionally
3500 * truncate dma_addr_t to u32.
3501 */
3502 addr = (u32) sg_dma_address(sg);
3503 sg_len = sg_dma_len(sg);
3504
3505 while (sg_len) {
3506 offset = addr & 0xffff;
3507 len = sg_len;
3508 if ((offset + sg_len) > 0x10000)
3509 len = 0x10000 - offset;
3510
3511 ap->prd[idx].addr = cpu_to_le32(addr);
3512 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3513 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3514
3515 idx++;
3516 sg_len -= len;
3517 addr += len;
3518 }
3519 }
3520
3521 if (idx)
3522 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3523}
3524/**
3525 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3526 * @qc: Metadata associated with taskfile to check
3527 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003528 * Allow low-level driver to filter ATA PACKET commands, returning
3529 * a status indicating whether or not it is OK to use DMA for the
3530 * supplied PACKET command.
3531 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003533 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003534 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003535 * RETURNS: 0 when ATAPI DMA can be used
3536 * nonzero otherwise
3537 */
3538int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3539{
3540 struct ata_port *ap = qc->ap;
3541 int rc = 0; /* Assume ATAPI DMA is OK by default */
3542
3543 if (ap->ops->check_atapi_dma)
3544 rc = ap->ops->check_atapi_dma(qc);
3545
3546 return rc;
3547}
3548/**
3549 * ata_qc_prep - Prepare taskfile for submission
3550 * @qc: Metadata associated with taskfile to be prepared
3551 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003552 * Prepare ATA taskfile for submission.
3553 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003554 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003555 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003556 */
3557void ata_qc_prep(struct ata_queued_cmd *qc)
3558{
3559 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3560 return;
3561
3562 ata_fill_sg(qc);
3563}
3564
Brian Kinge46834c2006-03-17 17:04:03 -06003565void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3566
Jeff Garzik0cba6322005-05-30 19:49:12 -04003567/**
3568 * ata_sg_init_one - Associate command with memory buffer
3569 * @qc: Command to be associated
3570 * @buf: Memory buffer
3571 * @buflen: Length of memory buffer, in bytes.
3572 *
3573 * Initialize the data-related elements of queued_cmd @qc
3574 * to point to a single memory buffer, @buf of byte length @buflen.
3575 *
3576 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003577 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003578 */
3579
Linus Torvalds1da177e2005-04-16 15:20:36 -07003580void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3581{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582 qc->flags |= ATA_QCFLAG_SINGLE;
3583
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003584 qc->__sg = &qc->sgent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003585 qc->n_elem = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003586 qc->orig_n_elem = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003587 qc->buf_virt = buf;
Brian King233277c2006-06-07 11:25:31 -05003588 qc->nbytes = buflen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589
Tejun Heo61c05962006-11-14 22:35:43 +09003590 sg_init_one(&qc->sgent, buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003591}
3592
Jeff Garzik0cba6322005-05-30 19:49:12 -04003593/**
3594 * ata_sg_init - Associate command with scatter-gather table.
3595 * @qc: Command to be associated
3596 * @sg: Scatter-gather table.
3597 * @n_elem: Number of elements in s/g table.
3598 *
3599 * Initialize the data-related elements of queued_cmd @qc
3600 * to point to a scatter-gather table @sg, containing @n_elem
3601 * elements.
3602 *
3603 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003604 * spin_lock_irqsave(host lock)
Jeff Garzik0cba6322005-05-30 19:49:12 -04003605 */
3606
Linus Torvalds1da177e2005-04-16 15:20:36 -07003607void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3608 unsigned int n_elem)
3609{
3610 qc->flags |= ATA_QCFLAG_SG;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003611 qc->__sg = sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003612 qc->n_elem = n_elem;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003613 qc->orig_n_elem = n_elem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003614}
3615
3616/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003617 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3618 * @qc: Command with memory buffer to be mapped.
3619 *
3620 * DMA-map the memory buffer associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003621 *
3622 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003623 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003624 *
3625 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003626 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003627 */
3628
3629static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3630{
3631 struct ata_port *ap = qc->ap;
3632 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003633 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003634 dma_addr_t dma_address;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003635 int trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003636
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003637 /* we must lengthen transfers to end on a 32-bit boundary */
3638 qc->pad_len = sg->length & 3;
3639 if (qc->pad_len) {
3640 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3641 struct scatterlist *psg = &qc->pad_sgent;
3642
Tejun Heoa46314742006-02-11 19:11:13 +09003643 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003644
3645 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3646
3647 if (qc->tf.flags & ATA_TFLAG_WRITE)
3648 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3649 qc->pad_len);
3650
3651 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3652 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3653 /* trim sg */
3654 sg->length -= qc->pad_len;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003655 if (sg->length == 0)
3656 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003657
3658 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3659 sg->length, qc->pad_len);
3660 }
3661
Tejun Heo2e242fa2006-02-20 23:48:38 +09003662 if (trim_sg) {
3663 qc->n_elem--;
Jeff Garzike1410f22005-11-14 14:06:26 -05003664 goto skip_map;
3665 }
3666
Brian King2f1f6102006-03-23 17:30:15 -06003667 dma_address = dma_map_single(ap->dev, qc->buf_virt,
Albert Lee32529e02005-05-26 03:49:42 -04003668 sg->length, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003669 if (dma_mapping_error(dma_address)) {
3670 /* restore sg */
3671 sg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003672 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003673 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003674
3675 sg_dma_address(sg) = dma_address;
Albert Lee32529e02005-05-26 03:49:42 -04003676 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003677
Tejun Heo2e242fa2006-02-20 23:48:38 +09003678skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003679 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3680 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3681
3682 return 0;
3683}
3684
3685/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003686 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3687 * @qc: Command with scatter-gather table to be mapped.
3688 *
3689 * DMA-map the scatter-gather table associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003690 *
3691 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04003692 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003693 *
3694 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003695 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003696 *
3697 */
3698
3699static int ata_sg_setup(struct ata_queued_cmd *qc)
3700{
3701 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003702 struct scatterlist *sg = qc->__sg;
3703 struct scatterlist *lsg = &sg[qc->n_elem - 1];
Jeff Garzike1410f22005-11-14 14:06:26 -05003704 int n_elem, pre_n_elem, dir, trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003705
3706 VPRINTK("ENTER, ata%u\n", ap->id);
Tejun Heoa46314742006-02-11 19:11:13 +09003707 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003708
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003709 /* we must lengthen transfers to end on a 32-bit boundary */
3710 qc->pad_len = lsg->length & 3;
3711 if (qc->pad_len) {
3712 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3713 struct scatterlist *psg = &qc->pad_sgent;
3714 unsigned int offset;
3715
Tejun Heoa46314742006-02-11 19:11:13 +09003716 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003717
3718 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3719
3720 /*
3721 * psg->page/offset are used to copy to-be-written
3722 * data in this function or read data in ata_sg_clean.
3723 */
3724 offset = lsg->offset + lsg->length - qc->pad_len;
3725 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3726 psg->offset = offset_in_page(offset);
3727
3728 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3729 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3730 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003731 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003732 }
3733
3734 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3735 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3736 /* trim last sg */
3737 lsg->length -= qc->pad_len;
Jeff Garzike1410f22005-11-14 14:06:26 -05003738 if (lsg->length == 0)
3739 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003740
3741 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3742 qc->n_elem - 1, lsg->length, qc->pad_len);
3743 }
3744
Jeff Garzike1410f22005-11-14 14:06:26 -05003745 pre_n_elem = qc->n_elem;
3746 if (trim_sg && pre_n_elem)
3747 pre_n_elem--;
3748
3749 if (!pre_n_elem) {
3750 n_elem = 0;
3751 goto skip_map;
3752 }
3753
Linus Torvalds1da177e2005-04-16 15:20:36 -07003754 dir = qc->dma_dir;
Brian King2f1f6102006-03-23 17:30:15 -06003755 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003756 if (n_elem < 1) {
3757 /* restore last sg */
3758 lsg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003759 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003760 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003761
3762 DPRINTK("%d sg elements mapped\n", n_elem);
3763
Jeff Garzike1410f22005-11-14 14:06:26 -05003764skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003765 qc->n_elem = n_elem;
3766
3767 return 0;
3768}
3769
3770/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003771 * swap_buf_le16 - swap halves of 16-bit words in place
Edward Falk0baab862005-06-02 18:17:13 -04003772 * @buf: Buffer to swap
3773 * @buf_words: Number of 16-bit words in buffer.
3774 *
3775 * Swap halves of 16-bit words if needed to convert from
3776 * little-endian byte order to native cpu byte order, or
3777 * vice-versa.
3778 *
3779 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003780 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04003781 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782void swap_buf_le16(u16 *buf, unsigned int buf_words)
3783{
3784#ifdef __BIG_ENDIAN
3785 unsigned int i;
3786
3787 for (i = 0; i < buf_words; i++)
3788 buf[i] = le16_to_cpu(buf[i]);
3789#endif /* __BIG_ENDIAN */
3790}
3791
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003792/**
Tejun Heo0d5ff562007-02-01 15:06:36 +09003793 * ata_data_xfer - Transfer data by PIO
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003794 * @adev: device to target
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003795 * @buf: data buffer
3796 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003797 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003798 *
3799 * Transfer data from/to the device data register by PIO.
3800 *
3801 * LOCKING:
3802 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003803 */
Tejun Heo0d5ff562007-02-01 15:06:36 +09003804void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
3805 unsigned int buflen, int write_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806{
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003807 struct ata_port *ap = adev->ap;
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003808 unsigned int words = buflen >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003810 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003811 if (write_data)
Tejun Heo0d5ff562007-02-01 15:06:36 +09003812 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003813 else
Tejun Heo0d5ff562007-02-01 15:06:36 +09003814 ioread16_rep(ap->ioaddr.data_addr, buf, words);
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003815
3816 /* Transfer trailing 1 byte, if any. */
3817 if (unlikely(buflen & 0x01)) {
3818 u16 align_buf[1] = { 0 };
3819 unsigned char *trailing_buf = buf + buflen - 1;
3820
3821 if (write_data) {
3822 memcpy(align_buf, trailing_buf, 1);
Tejun Heo0d5ff562007-02-01 15:06:36 +09003823 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003824 } else {
Tejun Heo0d5ff562007-02-01 15:06:36 +09003825 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003826 memcpy(trailing_buf, align_buf, 1);
3827 }
3828 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003829}
3830
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003831/**
Tejun Heo0d5ff562007-02-01 15:06:36 +09003832 * ata_data_xfer_noirq - Transfer data by PIO
Alan Cox75e99582006-05-24 14:14:41 +01003833 * @adev: device to target
3834 * @buf: data buffer
3835 * @buflen: buffer length
3836 * @write_data: read/write
3837 *
Tejun Heo88574552006-06-25 20:00:35 +09003838 * Transfer data from/to the device data register by PIO. Do the
Alan Cox75e99582006-05-24 14:14:41 +01003839 * transfer with interrupts disabled.
3840 *
3841 * LOCKING:
3842 * Inherited from caller.
3843 */
Tejun Heo0d5ff562007-02-01 15:06:36 +09003844void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
3845 unsigned int buflen, int write_data)
Alan Cox75e99582006-05-24 14:14:41 +01003846{
3847 unsigned long flags;
3848 local_irq_save(flags);
Tejun Heo0d5ff562007-02-01 15:06:36 +09003849 ata_data_xfer(adev, buf, buflen, write_data);
Alan Cox75e99582006-05-24 14:14:41 +01003850 local_irq_restore(flags);
3851}
3852
3853
3854/**
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003855 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3856 * @qc: Command on going
3857 *
3858 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3859 *
3860 * LOCKING:
3861 * Inherited from caller.
3862 */
3863
Linus Torvalds1da177e2005-04-16 15:20:36 -07003864static void ata_pio_sector(struct ata_queued_cmd *qc)
3865{
3866 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003867 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003868 struct ata_port *ap = qc->ap;
3869 struct page *page;
3870 unsigned int offset;
3871 unsigned char *buf;
3872
Tejun Heo726f0782007-01-03 17:30:39 +09003873 if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
Albert Lee14be71f2005-09-27 17:36:35 +08003874 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003875
3876 page = sg[qc->cursg].page;
Tejun Heo726f0782007-01-03 17:30:39 +09003877 offset = sg[qc->cursg].offset + qc->cursg_ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003878
3879 /* get the current page and offset */
3880 page = nth_page(page, (offset >> PAGE_SHIFT));
3881 offset %= PAGE_SIZE;
3882
Albert Lee7282aa42005-10-09 09:46:07 -04003883 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3884
Albert Lee91b8b312005-10-09 09:48:44 -04003885 if (PageHighMem(page)) {
3886 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04003887
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003888 /* FIXME: use a bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04003889 local_irq_save(flags);
3890 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04003891
Albert Lee91b8b312005-10-09 09:48:44 -04003892 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003893 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003894
3895 kunmap_atomic(buf, KM_IRQ0);
3896 local_irq_restore(flags);
3897 } else {
3898 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003899 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003900 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003901
Tejun Heo726f0782007-01-03 17:30:39 +09003902 qc->curbytes += ATA_SECT_SIZE;
3903 qc->cursg_ofs += ATA_SECT_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003904
Tejun Heo726f0782007-01-03 17:30:39 +09003905 if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003906 qc->cursg++;
3907 qc->cursg_ofs = 0;
3908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003909}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003910
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003911/**
Albert Lee07f6f7d2005-11-01 19:33:20 +08003912 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3913 * @qc: Command on going
3914 *
Jeff Garzikc81e29b2006-05-24 01:49:12 -04003915 * Transfer one or many ATA_SECT_SIZE of data from/to the
Albert Lee07f6f7d2005-11-01 19:33:20 +08003916 * ATA device for the DRQ request.
3917 *
3918 * LOCKING:
3919 * Inherited from caller.
3920 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003921
Albert Lee07f6f7d2005-11-01 19:33:20 +08003922static void ata_pio_sectors(struct ata_queued_cmd *qc)
3923{
3924 if (is_multi_taskfile(&qc->tf)) {
3925 /* READ/WRITE MULTIPLE */
3926 unsigned int nsect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003927
Jeff Garzik587005d2006-02-11 18:17:32 -05003928 WARN_ON(qc->dev->multi_count == 0);
Albert Lee07f6f7d2005-11-01 19:33:20 +08003929
Tejun Heo726f0782007-01-03 17:30:39 +09003930 nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
3931 qc->dev->multi_count);
Albert Lee07f6f7d2005-11-01 19:33:20 +08003932 while (nsect--)
3933 ata_pio_sector(qc);
3934 } else
3935 ata_pio_sector(qc);
3936}
3937
3938/**
Albert Leec71c1852005-10-04 06:03:45 -04003939 * atapi_send_cdb - Write CDB bytes to hardware
3940 * @ap: Port to which ATAPI device is attached.
3941 * @qc: Taskfile currently active
3942 *
3943 * When device has indicated its readiness to accept
3944 * a CDB, this function is called. Send the CDB.
3945 *
3946 * LOCKING:
3947 * caller.
3948 */
3949
3950static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3951{
3952 /* send SCSI cdb */
3953 DPRINTK("send cdb\n");
Jeff Garzikdb024d52006-02-13 00:23:57 -05003954 WARN_ON(qc->dev->cdb_len < 12);
Albert Leec71c1852005-10-04 06:03:45 -04003955
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003956 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
Albert Leec71c1852005-10-04 06:03:45 -04003957 ata_altstatus(ap); /* flush */
3958
3959 switch (qc->tf.protocol) {
3960 case ATA_PROT_ATAPI:
3961 ap->hsm_task_state = HSM_ST;
3962 break;
3963 case ATA_PROT_ATAPI_NODATA:
3964 ap->hsm_task_state = HSM_ST_LAST;
3965 break;
3966 case ATA_PROT_ATAPI_DMA:
3967 ap->hsm_task_state = HSM_ST_LAST;
3968 /* initiate bmdma */
3969 ap->ops->bmdma_start(qc);
3970 break;
3971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003972}
3973
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003974/**
3975 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3976 * @qc: Command on going
3977 * @bytes: number of bytes
3978 *
3979 * Transfer Transfer data from/to the ATAPI device.
3980 *
3981 * LOCKING:
3982 * Inherited from caller.
3983 *
3984 */
3985
Linus Torvalds1da177e2005-04-16 15:20:36 -07003986static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3987{
3988 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003989 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003990 struct ata_port *ap = qc->ap;
3991 struct page *page;
3992 unsigned char *buf;
3993 unsigned int offset, count;
3994
Albert Lee563a6e12005-08-12 14:17:50 +08003995 if (qc->curbytes + bytes >= qc->nbytes)
Albert Lee14be71f2005-09-27 17:36:35 +08003996 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003997
3998next_sg:
Albert Lee563a6e12005-08-12 14:17:50 +08003999 if (unlikely(qc->cursg >= qc->n_elem)) {
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004000 /*
Albert Lee563a6e12005-08-12 14:17:50 +08004001 * The end of qc->sg is reached and the device expects
4002 * more data to transfer. In order not to overrun qc->sg
4003 * and fulfill length specified in the byte count register,
4004 * - for read case, discard trailing data from the device
4005 * - for write case, padding zero data to the device
4006 */
4007 u16 pad_buf[1] = { 0 };
4008 unsigned int words = bytes >> 1;
4009 unsigned int i;
4010
4011 if (words) /* warning if bytes > 1 */
Tejun Heof15a1da2006-05-15 20:57:56 +09004012 ata_dev_printk(qc->dev, KERN_WARNING,
4013 "%u bytes trailing data\n", bytes);
Albert Lee563a6e12005-08-12 14:17:50 +08004014
4015 for (i = 0; i < words; i++)
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004016 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
Albert Lee563a6e12005-08-12 14:17:50 +08004017
Albert Lee14be71f2005-09-27 17:36:35 +08004018 ap->hsm_task_state = HSM_ST_LAST;
Albert Lee563a6e12005-08-12 14:17:50 +08004019 return;
4020 }
4021
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004022 sg = &qc->__sg[qc->cursg];
Linus Torvalds1da177e2005-04-16 15:20:36 -07004023
Linus Torvalds1da177e2005-04-16 15:20:36 -07004024 page = sg->page;
4025 offset = sg->offset + qc->cursg_ofs;
4026
4027 /* get the current page and offset */
4028 page = nth_page(page, (offset >> PAGE_SHIFT));
4029 offset %= PAGE_SIZE;
4030
Albert Lee6952df02005-06-06 15:56:03 +08004031 /* don't overrun current sg */
Albert Lee32529e02005-05-26 03:49:42 -04004032 count = min(sg->length - qc->cursg_ofs, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004033
4034 /* don't cross page boundaries */
4035 count = min(count, (unsigned int)PAGE_SIZE - offset);
4036
Albert Lee7282aa42005-10-09 09:46:07 -04004037 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4038
Albert Lee91b8b312005-10-09 09:48:44 -04004039 if (PageHighMem(page)) {
4040 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04004041
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004042 /* FIXME: use bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04004043 local_irq_save(flags);
4044 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04004045
Albert Lee91b8b312005-10-09 09:48:44 -04004046 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004047 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004048
4049 kunmap_atomic(buf, KM_IRQ0);
4050 local_irq_restore(flags);
4051 } else {
4052 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01004053 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04004054 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004055
4056 bytes -= count;
4057 qc->curbytes += count;
4058 qc->cursg_ofs += count;
4059
Albert Lee32529e02005-05-26 03:49:42 -04004060 if (qc->cursg_ofs == sg->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004061 qc->cursg++;
4062 qc->cursg_ofs = 0;
4063 }
4064
Albert Lee563a6e12005-08-12 14:17:50 +08004065 if (bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004066 goto next_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004067}
4068
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004069/**
4070 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4071 * @qc: Command on going
4072 *
4073 * Transfer Transfer data from/to the ATAPI device.
4074 *
4075 * LOCKING:
4076 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08004077 */
4078
Linus Torvalds1da177e2005-04-16 15:20:36 -07004079static void atapi_pio_bytes(struct ata_queued_cmd *qc)
4080{
4081 struct ata_port *ap = qc->ap;
4082 struct ata_device *dev = qc->dev;
4083 unsigned int ireason, bc_lo, bc_hi, bytes;
4084 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
4085
Albert Leeeec4c3f2006-05-18 17:51:10 +08004086 /* Abuse qc->result_tf for temp storage of intermediate TF
4087 * here to save some kernel stack usage.
4088 * For normal completion, qc->result_tf is not relevant. For
4089 * error, qc->result_tf is later overwritten by ata_qc_complete().
4090 * So, the correctness of qc->result_tf is not affected.
4091 */
4092 ap->ops->tf_read(ap, &qc->result_tf);
4093 ireason = qc->result_tf.nsect;
4094 bc_lo = qc->result_tf.lbam;
4095 bc_hi = qc->result_tf.lbah;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004096 bytes = (bc_hi << 8) | bc_lo;
4097
4098 /* shall be cleared to zero, indicating xfer of data */
4099 if (ireason & (1 << 0))
4100 goto err_out;
4101
4102 /* make sure transfer direction matches expected */
4103 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
4104 if (do_write != i_write)
4105 goto err_out;
4106
Albert Lee312f7da2005-09-27 17:38:03 +08004107 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
4108
Linus Torvalds1da177e2005-04-16 15:20:36 -07004109 __atapi_pio_bytes(qc, bytes);
4110
4111 return;
4112
4113err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09004114 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
Tejun Heo11a56d22006-01-23 13:09:36 +09004115 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08004116 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004117}
4118
4119/**
Albert Leec234fb02006-03-25 17:58:38 +08004120 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4121 * @ap: the target ata_port
4122 * @qc: qc on going
Linus Torvalds1da177e2005-04-16 15:20:36 -07004123 *
Albert Leec234fb02006-03-25 17:58:38 +08004124 * RETURNS:
4125 * 1 if ok in workqueue, 0 otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004126 */
Albert Leec234fb02006-03-25 17:58:38 +08004127
4128static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004129{
Albert Leec234fb02006-03-25 17:58:38 +08004130 if (qc->tf.flags & ATA_TFLAG_POLLING)
4131 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004132
Albert Leec234fb02006-03-25 17:58:38 +08004133 if (ap->hsm_task_state == HSM_ST_FIRST) {
4134 if (qc->tf.protocol == ATA_PROT_PIO &&
4135 (qc->tf.flags & ATA_TFLAG_WRITE))
4136 return 1;
4137
4138 if (is_atapi_taskfile(&qc->tf) &&
4139 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4140 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004141 }
4142
Albert Leec234fb02006-03-25 17:58:38 +08004143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004144}
4145
Albert Leec234fb02006-03-25 17:58:38 +08004146/**
Tejun Heoc17ea202006-05-15 20:59:29 +09004147 * ata_hsm_qc_complete - finish a qc running on standard HSM
4148 * @qc: Command to complete
4149 * @in_wq: 1 if called from workqueue, 0 otherwise
4150 *
4151 * Finish @qc which is running on standard HSM.
4152 *
4153 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004154 * If @in_wq is zero, spin_lock_irqsave(host lock).
Tejun Heoc17ea202006-05-15 20:59:29 +09004155 * Otherwise, none on entry and grabs host lock.
4156 */
4157static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
4158{
4159 struct ata_port *ap = qc->ap;
4160 unsigned long flags;
4161
4162 if (ap->ops->error_handler) {
4163 if (in_wq) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04004164 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004165
Jeff Garzikcca39742006-08-24 03:19:22 -04004166 /* EH might have kicked in while host lock is
4167 * released.
Tejun Heoc17ea202006-05-15 20:59:29 +09004168 */
4169 qc = ata_qc_from_tag(ap, qc->tag);
4170 if (qc) {
4171 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4172 ata_irq_on(ap);
4173 ata_qc_complete(qc);
4174 } else
4175 ata_port_freeze(ap);
4176 }
4177
Jeff Garzikba6a1302006-06-22 23:46:10 -04004178 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004179 } else {
4180 if (likely(!(qc->err_mask & AC_ERR_HSM)))
4181 ata_qc_complete(qc);
4182 else
4183 ata_port_freeze(ap);
4184 }
4185 } else {
4186 if (in_wq) {
Jeff Garzikba6a1302006-06-22 23:46:10 -04004187 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004188 ata_irq_on(ap);
4189 ata_qc_complete(qc);
Jeff Garzikba6a1302006-06-22 23:46:10 -04004190 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc17ea202006-05-15 20:59:29 +09004191 } else
4192 ata_qc_complete(qc);
4193 }
Jeff Garzikc81e29b2006-05-24 01:49:12 -04004194
4195 ata_altstatus(ap); /* flush */
Tejun Heoc17ea202006-05-15 20:59:29 +09004196}
4197
4198/**
Albert Leebb5cb292006-03-25 17:48:02 +08004199 * ata_hsm_move - move the HSM to the next state.
4200 * @ap: the target ata_port
4201 * @qc: qc on going
4202 * @status: current device status
4203 * @in_wq: 1 if called from workqueue, 0 otherwise
4204 *
4205 * RETURNS:
4206 * 1 when poll next status needed, 0 otherwise.
4207 */
Tejun Heo9a1004d2006-05-31 18:27:52 +09004208int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
4209 u8 status, int in_wq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004210{
Albert Leebb5cb292006-03-25 17:48:02 +08004211 unsigned long flags = 0;
4212 int poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004213
Albert Lee6912ccd2006-03-25 17:45:49 +08004214 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
Albert Lee0565c262006-02-13 18:55:25 +08004215
Albert Leebb5cb292006-03-25 17:48:02 +08004216 /* Make sure ata_qc_issue_prot() does not throw things
4217 * like DMA polling into the workqueue. Notice that
4218 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
Albert Lee1c848982005-12-05 15:40:15 +08004219 */
Albert Leec234fb02006-03-25 17:58:38 +08004220 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
Albert Lee1c848982005-12-05 15:40:15 +08004221
Albert Leee2cec772006-03-25 17:43:49 +08004222fsm_start:
Albert Lee999bb6f2006-03-25 18:07:48 +08004223 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4224 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004225
Albert Leee2cec772006-03-25 17:43:49 +08004226 switch (ap->hsm_task_state) {
4227 case HSM_ST_FIRST:
Albert Leebb5cb292006-03-25 17:48:02 +08004228 /* Send first data block or PACKET CDB */
4229
4230 /* If polling, we will stay in the work queue after
4231 * sending the data. Otherwise, interrupt handler
4232 * takes over after sending the data.
4233 */
4234 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
4235
Albert Leee2cec772006-03-25 17:43:49 +08004236 /* check device status */
Albert Lee3655d1d2006-05-19 11:43:04 +08004237 if (unlikely((status & ATA_DRQ) == 0)) {
4238 /* handle BSY=0, DRQ=0 as error */
4239 if (likely(status & (ATA_ERR | ATA_DF)))
4240 /* device stops HSM for abort/error */
4241 qc->err_mask |= AC_ERR_DEV;
4242 else
4243 /* HSM violation. Let EH handle this */
4244 qc->err_mask |= AC_ERR_HSM;
4245
Albert Leee2cec772006-03-25 17:43:49 +08004246 ap->hsm_task_state = HSM_ST_ERR;
4247 goto fsm_start;
4248 }
4249
Albert Lee71601952006-03-25 18:11:12 +08004250 /* Device should not ask for data transfer (DRQ=1)
4251 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004252 * We ignore DRQ here and stop the HSM by
4253 * changing hsm_task_state to HSM_ST_ERR and
4254 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004255 */
4256 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4257 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4258 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004259 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004260 ap->hsm_task_state = HSM_ST_ERR;
4261 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004262 }
4263
Albert Leebb5cb292006-03-25 17:48:02 +08004264 /* Send the CDB (atapi) or the first data block (ata pio out).
4265 * During the state transition, interrupt handler shouldn't
4266 * be invoked before the data transfer is complete and
4267 * hsm_task_state is changed. Hence, the following locking.
4268 */
4269 if (in_wq)
Jeff Garzikba6a1302006-06-22 23:46:10 -04004270 spin_lock_irqsave(ap->lock, flags);
Albert Leee2cec772006-03-25 17:43:49 +08004271
Albert Leebb5cb292006-03-25 17:48:02 +08004272 if (qc->tf.protocol == ATA_PROT_PIO) {
4273 /* PIO data out protocol.
4274 * send first data block.
4275 */
4276
4277 /* ata_pio_sectors() might change the state
4278 * to HSM_ST_LAST. so, the state is changed here
4279 * before ata_pio_sectors().
4280 */
4281 ap->hsm_task_state = HSM_ST;
4282 ata_pio_sectors(qc);
4283 ata_altstatus(ap); /* flush */
4284 } else
4285 /* send CDB */
4286 atapi_send_cdb(ap, qc);
4287
4288 if (in_wq)
Jeff Garzikba6a1302006-06-22 23:46:10 -04004289 spin_unlock_irqrestore(ap->lock, flags);
Albert Leebb5cb292006-03-25 17:48:02 +08004290
4291 /* if polling, ata_pio_task() handles the rest.
4292 * otherwise, interrupt handler takes over from here.
4293 */
Albert Leee2cec772006-03-25 17:43:49 +08004294 break;
4295
4296 case HSM_ST:
4297 /* complete command or read/write the data register */
4298 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4299 /* ATAPI PIO protocol */
4300 if ((status & ATA_DRQ) == 0) {
Albert Lee3655d1d2006-05-19 11:43:04 +08004301 /* No more data to transfer or device error.
4302 * Device error will be tagged in HSM_ST_LAST.
4303 */
Albert Leee2cec772006-03-25 17:43:49 +08004304 ap->hsm_task_state = HSM_ST_LAST;
4305 goto fsm_start;
4306 }
4307
Albert Lee71601952006-03-25 18:11:12 +08004308 /* Device should not ask for data transfer (DRQ=1)
4309 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004310 * We ignore DRQ here and stop the HSM by
4311 * changing hsm_task_state to HSM_ST_ERR and
4312 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004313 */
4314 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4315 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4316 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004317 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004318 ap->hsm_task_state = HSM_ST_ERR;
4319 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004320 }
4321
Albert Leee2cec772006-03-25 17:43:49 +08004322 atapi_pio_bytes(qc);
4323
4324 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4325 /* bad ireason reported by device */
4326 goto fsm_start;
4327
4328 } else {
4329 /* ATA PIO protocol */
4330 if (unlikely((status & ATA_DRQ) == 0)) {
4331 /* handle BSY=0, DRQ=0 as error */
Albert Lee3655d1d2006-05-19 11:43:04 +08004332 if (likely(status & (ATA_ERR | ATA_DF)))
4333 /* device stops HSM for abort/error */
4334 qc->err_mask |= AC_ERR_DEV;
4335 else
Tejun Heo55a8e2c2006-11-10 18:08:10 +09004336 /* HSM violation. Let EH handle this.
4337 * Phantom devices also trigger this
4338 * condition. Mark hint.
4339 */
4340 qc->err_mask |= AC_ERR_HSM |
4341 AC_ERR_NODEV_HINT;
Albert Lee3655d1d2006-05-19 11:43:04 +08004342
Albert Leee2cec772006-03-25 17:43:49 +08004343 ap->hsm_task_state = HSM_ST_ERR;
4344 goto fsm_start;
4345 }
4346
Albert Leeeee6c322006-04-01 17:38:43 +08004347 /* For PIO reads, some devices may ask for
4348 * data transfer (DRQ=1) alone with ERR=1.
4349 * We respect DRQ here and transfer one
4350 * block of junk data before changing the
4351 * hsm_task_state to HSM_ST_ERR.
4352 *
4353 * For PIO writes, ERR=1 DRQ=1 doesn't make
4354 * sense since the data block has been
4355 * transferred to the device.
Albert Lee71601952006-03-25 18:11:12 +08004356 */
4357 if (unlikely(status & (ATA_ERR | ATA_DF))) {
Albert Lee71601952006-03-25 18:11:12 +08004358 /* data might be corrputed */
4359 qc->err_mask |= AC_ERR_DEV;
Albert Leeeee6c322006-04-01 17:38:43 +08004360
4361 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
4362 ata_pio_sectors(qc);
4363 ata_altstatus(ap);
4364 status = ata_wait_idle(ap);
4365 }
4366
Albert Lee3655d1d2006-05-19 11:43:04 +08004367 if (status & (ATA_BUSY | ATA_DRQ))
4368 qc->err_mask |= AC_ERR_HSM;
4369
Albert Leeeee6c322006-04-01 17:38:43 +08004370 /* ata_pio_sectors() might change the
4371 * state to HSM_ST_LAST. so, the state
4372 * is changed after ata_pio_sectors().
4373 */
4374 ap->hsm_task_state = HSM_ST_ERR;
4375 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004376 }
4377
Albert Leee2cec772006-03-25 17:43:49 +08004378 ata_pio_sectors(qc);
4379
4380 if (ap->hsm_task_state == HSM_ST_LAST &&
4381 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4382 /* all data read */
4383 ata_altstatus(ap);
Albert Lee52a32202006-03-25 18:18:15 +08004384 status = ata_wait_idle(ap);
Albert Leee2cec772006-03-25 17:43:49 +08004385 goto fsm_start;
4386 }
4387 }
4388
4389 ata_altstatus(ap); /* flush */
Albert Leebb5cb292006-03-25 17:48:02 +08004390 poll_next = 1;
Albert Leee2cec772006-03-25 17:43:49 +08004391 break;
4392
4393 case HSM_ST_LAST:
Albert Lee6912ccd2006-03-25 17:45:49 +08004394 if (unlikely(!ata_ok(status))) {
4395 qc->err_mask |= __ac_err_mask(status);
Albert Leee2cec772006-03-25 17:43:49 +08004396 ap->hsm_task_state = HSM_ST_ERR;
4397 goto fsm_start;
4398 }
4399
4400 /* no more data to transfer */
Albert Lee4332a772006-04-03 17:43:24 +08004401 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4402 ap->id, qc->dev->devno, status);
Albert Leee2cec772006-03-25 17:43:49 +08004403
Albert Lee6912ccd2006-03-25 17:45:49 +08004404 WARN_ON(qc->err_mask);
4405
Albert Leee2cec772006-03-25 17:43:49 +08004406 ap->hsm_task_state = HSM_ST_IDLE;
4407
4408 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004409 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004410
4411 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004412 break;
4413
4414 case HSM_ST_ERR:
Albert Leee2cec772006-03-25 17:43:49 +08004415 /* make sure qc->err_mask is available to
4416 * know what's wrong and recover
4417 */
4418 WARN_ON(qc->err_mask == 0);
4419
4420 ap->hsm_task_state = HSM_ST_IDLE;
Albert Leebb5cb292006-03-25 17:48:02 +08004421
Albert Lee999bb6f2006-03-25 18:07:48 +08004422 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004423 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004424
4425 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004426 break;
4427 default:
Albert Leebb5cb292006-03-25 17:48:02 +08004428 poll_next = 0;
Albert Lee6912ccd2006-03-25 17:45:49 +08004429 BUG();
Albert Leee2cec772006-03-25 17:43:49 +08004430 }
4431
Albert Leebb5cb292006-03-25 17:48:02 +08004432 return poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004433}
4434
David Howells65f27f32006-11-22 14:55:48 +00004435static void ata_pio_task(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004436{
David Howells65f27f32006-11-22 14:55:48 +00004437 struct ata_port *ap =
4438 container_of(work, struct ata_port, port_task.work);
4439 struct ata_queued_cmd *qc = ap->port_task_data;
Albert Leea1af3732006-03-25 17:50:15 +08004440 u8 status;
4441 int poll_next;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004442
4443fsm_start:
Albert Leea1af3732006-03-25 17:50:15 +08004444 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004445
Albert Leea1af3732006-03-25 17:50:15 +08004446 /*
4447 * This is purely heuristic. This is a fast path.
4448 * Sometimes when we enter, BSY will be cleared in
4449 * a chk-status or two. If not, the drive is probably seeking
4450 * or something. Snooze for a couple msecs, then
4451 * chk-status again. If still busy, queue delayed work.
4452 */
4453 status = ata_busy_wait(ap, ATA_BUSY, 5);
4454 if (status & ATA_BUSY) {
4455 msleep(2);
4456 status = ata_busy_wait(ap, ATA_BUSY, 10);
4457 if (status & ATA_BUSY) {
Albert Lee31ce6da2006-04-03 18:31:44 +08004458 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
Albert Leea1af3732006-03-25 17:50:15 +08004459 return;
4460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004461 }
4462
Albert Leea1af3732006-03-25 17:50:15 +08004463 /* move the HSM */
4464 poll_next = ata_hsm_move(ap, qc, status, 1);
4465
4466 /* another command or interrupt handler
4467 * may be running at this point.
4468 */
4469 if (poll_next)
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004470 goto fsm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004471}
4472
Linus Torvalds1da177e2005-04-16 15:20:36 -07004473/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004474 * ata_qc_new - Request an available ATA command, for queueing
4475 * @ap: Port associated with device @dev
4476 * @dev: Device from whom we request an available command structure
4477 *
4478 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004479 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004480 */
4481
4482static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4483{
4484 struct ata_queued_cmd *qc = NULL;
4485 unsigned int i;
4486
Tejun Heoe3180492006-05-15 20:58:09 +09004487 /* no command while frozen */
Tejun Heob51e9e52006-06-29 01:29:30 +09004488 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
Tejun Heoe3180492006-05-15 20:58:09 +09004489 return NULL;
4490
Tejun Heo2ab7db12006-05-15 20:58:02 +09004491 /* the last tag is reserved for internal command. */
4492 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
Tejun Heo6cec4a32006-05-15 21:03:41 +09004493 if (!test_and_set_bit(i, &ap->qc_allocated)) {
Tejun Heof69499f2006-05-15 20:58:03 +09004494 qc = __ata_qc_from_tag(ap, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004495 break;
4496 }
4497
4498 if (qc)
4499 qc->tag = i;
4500
4501 return qc;
4502}
4503
4504/**
4505 * ata_qc_new_init - Request an available ATA command, and initialize it
Linus Torvalds1da177e2005-04-16 15:20:36 -07004506 * @dev: Device from whom we request an available command structure
4507 *
4508 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004509 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004510 */
4511
Tejun Heo3373efd2006-05-15 20:57:53 +09004512struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004513{
Tejun Heo3373efd2006-05-15 20:57:53 +09004514 struct ata_port *ap = dev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004515 struct ata_queued_cmd *qc;
4516
4517 qc = ata_qc_new(ap);
4518 if (qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004519 qc->scsicmd = NULL;
4520 qc->ap = ap;
4521 qc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004522
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05004523 ata_qc_reinit(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004524 }
4525
4526 return qc;
4527}
4528
Linus Torvalds1da177e2005-04-16 15:20:36 -07004529/**
4530 * ata_qc_free - free unused ata_queued_cmd
4531 * @qc: Command to complete
4532 *
4533 * Designed to free unused ata_queued_cmd object
4534 * in case something prevents using it.
4535 *
4536 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004537 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004538 */
4539void ata_qc_free(struct ata_queued_cmd *qc)
4540{
Tejun Heo4ba946e2006-01-23 13:09:36 +09004541 struct ata_port *ap = qc->ap;
4542 unsigned int tag;
4543
Tejun Heoa46314742006-02-11 19:11:13 +09004544 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004545
Tejun Heo4ba946e2006-01-23 13:09:36 +09004546 qc->flags = 0;
4547 tag = qc->tag;
4548 if (likely(ata_tag_valid(tag))) {
Tejun Heo4ba946e2006-01-23 13:09:36 +09004549 qc->tag = ATA_TAG_POISON;
Tejun Heo6cec4a32006-05-15 21:03:41 +09004550 clear_bit(tag, &ap->qc_allocated);
Tejun Heo4ba946e2006-01-23 13:09:36 +09004551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004552}
4553
Tejun Heo76014422006-02-11 15:13:49 +09004554void __ata_qc_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004555{
Tejun Heodedaf2b2006-05-15 21:03:43 +09004556 struct ata_port *ap = qc->ap;
4557
Tejun Heoa46314742006-02-11 19:11:13 +09004558 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4559 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004560
4561 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4562 ata_sg_clean(qc);
4563
Tejun Heo7401abf2006-05-15 20:57:32 +09004564 /* command should be marked inactive atomically with qc completion */
Tejun Heodedaf2b2006-05-15 21:03:43 +09004565 if (qc->tf.protocol == ATA_PROT_NCQ)
4566 ap->sactive &= ~(1 << qc->tag);
4567 else
4568 ap->active_tag = ATA_TAG_POISON;
Tejun Heo7401abf2006-05-15 20:57:32 +09004569
Albert Lee3f3791d2005-08-16 14:25:38 +08004570 /* atapi: mark qc as inactive to prevent the interrupt handler
4571 * from completing the command twice later, before the error handler
4572 * is called. (when rc != 0 and atapi request sense is needed)
4573 */
4574 qc->flags &= ~ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004575 ap->qc_active &= ~(1 << qc->tag);
Albert Lee3f3791d2005-08-16 14:25:38 +08004576
Linus Torvalds1da177e2005-04-16 15:20:36 -07004577 /* call completion callback */
Tejun Heo77853bf2006-01-23 13:09:36 +09004578 qc->complete_fn(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004579}
4580
Tejun Heo39599a52006-11-14 22:37:35 +09004581static void fill_result_tf(struct ata_queued_cmd *qc)
4582{
4583 struct ata_port *ap = qc->ap;
4584
4585 ap->ops->tf_read(ap, &qc->result_tf);
4586 qc->result_tf.flags = qc->tf.flags;
4587}
4588
Tejun Heof686bcb2006-05-15 20:58:05 +09004589/**
4590 * ata_qc_complete - Complete an active ATA command
4591 * @qc: Command to complete
4592 * @err_mask: ATA Status register contents
4593 *
4594 * Indicate to the mid and upper layers that an ATA
4595 * command has completed, with either an ok or not-ok status.
4596 *
4597 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004598 * spin_lock_irqsave(host lock)
Tejun Heof686bcb2006-05-15 20:58:05 +09004599 */
4600void ata_qc_complete(struct ata_queued_cmd *qc)
4601{
4602 struct ata_port *ap = qc->ap;
4603
4604 /* XXX: New EH and old EH use different mechanisms to
4605 * synchronize EH with regular execution path.
4606 *
4607 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4608 * Normal execution path is responsible for not accessing a
4609 * failed qc. libata core enforces the rule by returning NULL
4610 * from ata_qc_from_tag() for failed qcs.
4611 *
4612 * Old EH depends on ata_qc_complete() nullifying completion
4613 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4614 * not synchronize with interrupt handler. Only PIO task is
4615 * taken care of.
4616 */
4617 if (ap->ops->error_handler) {
Tejun Heob51e9e52006-06-29 01:29:30 +09004618 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
Tejun Heof686bcb2006-05-15 20:58:05 +09004619
4620 if (unlikely(qc->err_mask))
4621 qc->flags |= ATA_QCFLAG_FAILED;
4622
4623 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4624 if (!ata_tag_internal(qc->tag)) {
4625 /* always fill result TF for failed qc */
Tejun Heo39599a52006-11-14 22:37:35 +09004626 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004627 ata_qc_schedule_eh(qc);
4628 return;
4629 }
4630 }
4631
4632 /* read result TF if requested */
4633 if (qc->flags & ATA_QCFLAG_RESULT_TF)
Tejun Heo39599a52006-11-14 22:37:35 +09004634 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004635
4636 __ata_qc_complete(qc);
4637 } else {
4638 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4639 return;
4640
4641 /* read result TF if failed or requested */
4642 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
Tejun Heo39599a52006-11-14 22:37:35 +09004643 fill_result_tf(qc);
Tejun Heof686bcb2006-05-15 20:58:05 +09004644
4645 __ata_qc_complete(qc);
4646 }
4647}
4648
Tejun Heodedaf2b2006-05-15 21:03:43 +09004649/**
4650 * ata_qc_complete_multiple - Complete multiple qcs successfully
4651 * @ap: port in question
4652 * @qc_active: new qc_active mask
4653 * @finish_qc: LLDD callback invoked before completing a qc
4654 *
4655 * Complete in-flight commands. This functions is meant to be
4656 * called from low-level driver's interrupt routine to complete
4657 * requests normally. ap->qc_active and @qc_active is compared
4658 * and commands are completed accordingly.
4659 *
4660 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004661 * spin_lock_irqsave(host lock)
Tejun Heodedaf2b2006-05-15 21:03:43 +09004662 *
4663 * RETURNS:
4664 * Number of completed commands on success, -errno otherwise.
4665 */
4666int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
4667 void (*finish_qc)(struct ata_queued_cmd *))
4668{
4669 int nr_done = 0;
4670 u32 done_mask;
4671 int i;
4672
4673 done_mask = ap->qc_active ^ qc_active;
4674
4675 if (unlikely(done_mask & qc_active)) {
4676 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4677 "(%08x->%08x)\n", ap->qc_active, qc_active);
4678 return -EINVAL;
4679 }
4680
4681 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4682 struct ata_queued_cmd *qc;
4683
4684 if (!(done_mask & (1 << i)))
4685 continue;
4686
4687 if ((qc = ata_qc_from_tag(ap, i))) {
4688 if (finish_qc)
4689 finish_qc(qc);
4690 ata_qc_complete(qc);
4691 nr_done++;
4692 }
4693 }
4694
4695 return nr_done;
4696}
4697
Linus Torvalds1da177e2005-04-16 15:20:36 -07004698static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4699{
4700 struct ata_port *ap = qc->ap;
4701
4702 switch (qc->tf.protocol) {
Tejun Heo3dc1d882006-05-15 21:03:45 +09004703 case ATA_PROT_NCQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004704 case ATA_PROT_DMA:
4705 case ATA_PROT_ATAPI_DMA:
4706 return 1;
4707
4708 case ATA_PROT_ATAPI:
4709 case ATA_PROT_PIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004710 if (ap->flags & ATA_FLAG_PIO_DMA)
4711 return 1;
4712
4713 /* fall through */
4714
4715 default:
4716 return 0;
4717 }
4718
4719 /* never reached */
4720}
4721
4722/**
4723 * ata_qc_issue - issue taskfile to device
4724 * @qc: command to issue to device
4725 *
4726 * Prepare an ATA command to submission to device.
4727 * This includes mapping the data into a DMA-able
4728 * area, filling in the S/G table, and finally
4729 * writing the taskfile to hardware, starting the command.
4730 *
4731 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004732 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004733 */
Tejun Heo8e0e6942006-03-31 20:41:11 +09004734void ata_qc_issue(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004735{
4736 struct ata_port *ap = qc->ap;
4737
Tejun Heodedaf2b2006-05-15 21:03:43 +09004738 /* Make sure only one non-NCQ command is outstanding. The
4739 * check is skipped for old EH because it reuses active qc to
4740 * request ATAPI sense.
4741 */
4742 WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
4743
4744 if (qc->tf.protocol == ATA_PROT_NCQ) {
4745 WARN_ON(ap->sactive & (1 << qc->tag));
4746 ap->sactive |= 1 << qc->tag;
4747 } else {
4748 WARN_ON(ap->sactive);
4749 ap->active_tag = qc->tag;
4750 }
4751
Tejun Heoe4a70e72006-03-31 20:36:47 +09004752 qc->flags |= ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004753 ap->qc_active |= 1 << qc->tag;
Tejun Heoe4a70e72006-03-31 20:36:47 +09004754
Linus Torvalds1da177e2005-04-16 15:20:36 -07004755 if (ata_should_dma_map(qc)) {
4756 if (qc->flags & ATA_QCFLAG_SG) {
4757 if (ata_sg_setup(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004758 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004759 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4760 if (ata_sg_setup_one(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004761 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004762 }
4763 } else {
4764 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4765 }
4766
4767 ap->ops->qc_prep(qc);
4768
Tejun Heo8e0e6942006-03-31 20:41:11 +09004769 qc->err_mask |= ap->ops->qc_issue(qc);
4770 if (unlikely(qc->err_mask))
4771 goto err;
4772 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004773
Tejun Heo8e436af2006-01-23 13:09:36 +09004774sg_err:
4775 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Tejun Heo8e0e6942006-03-31 20:41:11 +09004776 qc->err_mask |= AC_ERR_SYSTEM;
4777err:
4778 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004779}
4780
4781/**
4782 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4783 * @qc: command to issue to device
4784 *
4785 * Using various libata functions and hooks, this function
4786 * starts an ATA command. ATA commands are grouped into
4787 * classes called "protocols", and issuing each type of protocol
4788 * is slightly different.
4789 *
Edward Falk0baab862005-06-02 18:17:13 -04004790 * May be used as the qc_issue() entry in ata_port_operations.
4791 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004792 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004793 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004794 *
4795 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004796 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004797 */
4798
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004799unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004800{
4801 struct ata_port *ap = qc->ap;
4802
Albert Leee50362e2005-09-27 17:39:50 +08004803 /* Use polling pio if the LLD doesn't handle
4804 * interrupt driven pio and atapi CDB interrupt.
4805 */
4806 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4807 switch (qc->tf.protocol) {
4808 case ATA_PROT_PIO:
Albert Leee3472cb2006-12-07 11:37:58 +08004809 case ATA_PROT_NODATA:
Albert Leee50362e2005-09-27 17:39:50 +08004810 case ATA_PROT_ATAPI:
4811 case ATA_PROT_ATAPI_NODATA:
4812 qc->tf.flags |= ATA_TFLAG_POLLING;
4813 break;
4814 case ATA_PROT_ATAPI_DMA:
4815 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
Albert Lee3a778272006-06-22 13:00:25 +08004816 /* see ata_dma_blacklisted() */
Albert Leee50362e2005-09-27 17:39:50 +08004817 BUG();
4818 break;
4819 default:
4820 break;
4821 }
4822 }
4823
Tejun Heo3d3cca32006-11-16 10:50:50 +09004824 /* Some controllers show flaky interrupt behavior after
4825 * setting xfer mode. Use polling instead.
4826 */
4827 if (unlikely(qc->tf.command == ATA_CMD_SET_FEATURES &&
4828 qc->tf.feature == SETFEATURES_XFER) &&
4829 (ap->flags & ATA_FLAG_SETXFER_POLLING))
4830 qc->tf.flags |= ATA_TFLAG_POLLING;
4831
Albert Lee312f7da2005-09-27 17:38:03 +08004832 /* select the device */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004833 ata_dev_select(ap, qc->dev->devno, 1, 0);
4834
Albert Lee312f7da2005-09-27 17:38:03 +08004835 /* start the command */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004836 switch (qc->tf.protocol) {
4837 case ATA_PROT_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08004838 if (qc->tf.flags & ATA_TFLAG_POLLING)
4839 ata_qc_set_polling(qc);
4840
Jeff Garzike5338252005-10-30 21:37:17 -05004841 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08004842 ap->hsm_task_state = HSM_ST_LAST;
4843
4844 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08004845 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08004846
Linus Torvalds1da177e2005-04-16 15:20:36 -07004847 break;
4848
4849 case ATA_PROT_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05004850 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08004851
Linus Torvalds1da177e2005-04-16 15:20:36 -07004852 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4853 ap->ops->bmdma_setup(qc); /* set up bmdma */
4854 ap->ops->bmdma_start(qc); /* initiate bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08004855 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004856 break;
4857
Albert Lee312f7da2005-09-27 17:38:03 +08004858 case ATA_PROT_PIO:
4859 if (qc->tf.flags & ATA_TFLAG_POLLING)
4860 ata_qc_set_polling(qc);
4861
Jeff Garzike5338252005-10-30 21:37:17 -05004862 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08004863
Albert Lee54f00382005-09-30 19:14:19 +08004864 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4865 /* PIO data out protocol */
4866 ap->hsm_task_state = HSM_ST_FIRST;
Albert Lee31ce6da2006-04-03 18:31:44 +08004867 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee54f00382005-09-30 19:14:19 +08004868
4869 /* always send first data block using
Albert Leee27486d2005-11-01 19:24:49 +08004870 * the ata_pio_task() codepath.
Albert Lee54f00382005-09-30 19:14:19 +08004871 */
Albert Lee312f7da2005-09-27 17:38:03 +08004872 } else {
Albert Lee54f00382005-09-30 19:14:19 +08004873 /* PIO data in protocol */
4874 ap->hsm_task_state = HSM_ST;
Albert Lee312f7da2005-09-27 17:38:03 +08004875
Albert Lee54f00382005-09-30 19:14:19 +08004876 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08004877 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08004878
Albert Lee54f00382005-09-30 19:14:19 +08004879 /* if polling, ata_pio_task() handles the rest.
4880 * otherwise, interrupt handler takes over from here.
4881 */
Albert Lee312f7da2005-09-27 17:38:03 +08004882 }
4883
Linus Torvalds1da177e2005-04-16 15:20:36 -07004884 break;
4885
4886 case ATA_PROT_ATAPI:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004887 case ATA_PROT_ATAPI_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08004888 if (qc->tf.flags & ATA_TFLAG_POLLING)
4889 ata_qc_set_polling(qc);
4890
Jeff Garzike5338252005-10-30 21:37:17 -05004891 ata_tf_to_host(ap, &qc->tf);
Jeff Garzikf6ef65e2006-01-27 02:45:00 -05004892
Albert Lee312f7da2005-09-27 17:38:03 +08004893 ap->hsm_task_state = HSM_ST_FIRST;
4894
4895 /* send cdb by polling if no cdb interrupt */
4896 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4897 (qc->tf.flags & ATA_TFLAG_POLLING))
Albert Lee31ce6da2006-04-03 18:31:44 +08004898 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004899 break;
4900
4901 case ATA_PROT_ATAPI_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05004902 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08004903
Linus Torvalds1da177e2005-04-16 15:20:36 -07004904 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4905 ap->ops->bmdma_setup(qc); /* set up bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08004906 ap->hsm_task_state = HSM_ST_FIRST;
4907
4908 /* send cdb by polling if no cdb interrupt */
4909 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Albert Lee31ce6da2006-04-03 18:31:44 +08004910 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004911 break;
4912
4913 default:
4914 WARN_ON(1);
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004915 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004916 }
4917
4918 return 0;
4919}
4920
4921/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004922 * ata_host_intr - Handle host interrupt for given (port, task)
4923 * @ap: Port on which interrupt arrived (possibly...)
4924 * @qc: Taskfile currently active in engine
4925 *
4926 * Handle host interrupt for given queued command. Currently,
4927 * only DMA interrupts are handled. All other commands are
4928 * handled via polling with interrupts disabled (nIEN bit).
4929 *
4930 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04004931 * spin_lock_irqsave(host lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004932 *
4933 * RETURNS:
4934 * One if interrupt was handled, zero if not (shared irq).
4935 */
4936
4937inline unsigned int ata_host_intr (struct ata_port *ap,
4938 struct ata_queued_cmd *qc)
4939{
Tejun Heoea547632006-11-17 12:06:21 +09004940 struct ata_eh_info *ehi = &ap->eh_info;
Albert Lee312f7da2005-09-27 17:38:03 +08004941 u8 status, host_stat = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004942
Albert Lee312f7da2005-09-27 17:38:03 +08004943 VPRINTK("ata%u: protocol %d task_state %d\n",
4944 ap->id, qc->tf.protocol, ap->hsm_task_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004945
Albert Lee312f7da2005-09-27 17:38:03 +08004946 /* Check whether we are expecting interrupt in this state */
4947 switch (ap->hsm_task_state) {
4948 case HSM_ST_FIRST:
Albert Lee6912ccd2006-03-25 17:45:49 +08004949 /* Some pre-ATAPI-4 devices assert INTRQ
4950 * at this state when ready to receive CDB.
4951 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004952
Albert Lee312f7da2005-09-27 17:38:03 +08004953 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4954 * The flag was turned on only for atapi devices.
4955 * No need to check is_atapi_taskfile(&qc->tf) again.
4956 */
4957 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004958 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004959 break;
Albert Lee312f7da2005-09-27 17:38:03 +08004960 case HSM_ST_LAST:
4961 if (qc->tf.protocol == ATA_PROT_DMA ||
4962 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4963 /* check status of DMA engine */
4964 host_stat = ap->ops->bmdma_status(ap);
4965 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004966
Albert Lee312f7da2005-09-27 17:38:03 +08004967 /* if it's not our irq... */
4968 if (!(host_stat & ATA_DMA_INTR))
4969 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004970
Albert Lee312f7da2005-09-27 17:38:03 +08004971 /* before we do anything else, clear DMA-Start bit */
4972 ap->ops->bmdma_stop(qc);
Albert Leea4f16612005-12-26 16:40:53 +08004973
4974 if (unlikely(host_stat & ATA_DMA_ERR)) {
4975 /* error when transfering data to/from memory */
4976 qc->err_mask |= AC_ERR_HOST_BUS;
4977 ap->hsm_task_state = HSM_ST_ERR;
4978 }
Albert Lee312f7da2005-09-27 17:38:03 +08004979 }
4980 break;
4981 case HSM_ST:
4982 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004983 default:
4984 goto idle_irq;
4985 }
4986
Albert Lee312f7da2005-09-27 17:38:03 +08004987 /* check altstatus */
4988 status = ata_altstatus(ap);
4989 if (status & ATA_BUSY)
4990 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004991
Albert Lee312f7da2005-09-27 17:38:03 +08004992 /* check main status, clearing INTRQ */
4993 status = ata_chk_status(ap);
4994 if (unlikely(status & ATA_BUSY))
4995 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004996
Albert Lee312f7da2005-09-27 17:38:03 +08004997 /* ack bmdma irq events */
4998 ap->ops->irq_clear(ap);
4999
Albert Leebb5cb292006-03-25 17:48:02 +08005000 ata_hsm_move(ap, qc, status, 0);
Tejun Heoea547632006-11-17 12:06:21 +09005001
5002 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
5003 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
5004 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
5005
Linus Torvalds1da177e2005-04-16 15:20:36 -07005006 return 1; /* irq handled */
5007
5008idle_irq:
5009 ap->stats.idle_irq++;
5010
5011#ifdef ATA_IRQ_TRAP
5012 if ((ap->stats.idle_irq % 1000) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005013 ata_irq_ack(ap, 0); /* debug trap */
Tejun Heof15a1da2006-05-15 20:57:56 +09005014 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
Alan Cox23cfce82006-03-21 16:06:53 +00005015 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005016 }
5017#endif
5018 return 0; /* irq not handled */
5019}
5020
5021/**
5022 * ata_interrupt - Default ATA host interrupt handler
Jeff Garzik0cba6322005-05-30 19:49:12 -04005023 * @irq: irq line (unused)
Jeff Garzikcca39742006-08-24 03:19:22 -04005024 * @dev_instance: pointer to our ata_host information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07005025 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005026 * Default interrupt handler for PCI IDE devices. Calls
5027 * ata_host_intr() for each port that is not disabled.
5028 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005029 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04005030 * Obtains host lock during operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005031 *
5032 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005033 * IRQ_NONE or IRQ_HANDLED.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005034 */
5035
David Howells7d12e782006-10-05 14:55:46 +01005036irqreturn_t ata_interrupt (int irq, void *dev_instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005037{
Jeff Garzikcca39742006-08-24 03:19:22 -04005038 struct ata_host *host = dev_instance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005039 unsigned int i;
5040 unsigned int handled = 0;
5041 unsigned long flags;
5042
5043 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
Jeff Garzikcca39742006-08-24 03:19:22 -04005044 spin_lock_irqsave(&host->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005045
Jeff Garzikcca39742006-08-24 03:19:22 -04005046 for (i = 0; i < host->n_ports; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005047 struct ata_port *ap;
5048
Jeff Garzikcca39742006-08-24 03:19:22 -04005049 ap = host->ports[i];
Tejun Heoc1389502005-08-22 14:59:24 +09005050 if (ap &&
Jeff Garzik029f5462006-04-02 10:30:40 -04005051 !(ap->flags & ATA_FLAG_DISABLED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005052 struct ata_queued_cmd *qc;
5053
5054 qc = ata_qc_from_tag(ap, ap->active_tag);
Albert Lee312f7da2005-09-27 17:38:03 +08005055 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
Albert Lee21b1ed72005-04-29 17:34:59 +08005056 (qc->flags & ATA_QCFLAG_ACTIVE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005057 handled |= ata_host_intr(ap, qc);
5058 }
5059 }
5060
Jeff Garzikcca39742006-08-24 03:19:22 -04005061 spin_unlock_irqrestore(&host->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005062
5063 return IRQ_RETVAL(handled);
5064}
5065
Tejun Heo34bf2172006-05-15 20:57:46 +09005066/**
5067 * sata_scr_valid - test whether SCRs are accessible
5068 * @ap: ATA port to test SCR accessibility for
5069 *
5070 * Test whether SCRs are accessible for @ap.
5071 *
5072 * LOCKING:
5073 * None.
5074 *
5075 * RETURNS:
5076 * 1 if SCRs are accessible, 0 otherwise.
5077 */
5078int sata_scr_valid(struct ata_port *ap)
5079{
5080 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
5081}
5082
5083/**
5084 * sata_scr_read - read SCR register of the specified port
5085 * @ap: ATA port to read SCR for
5086 * @reg: SCR to read
5087 * @val: Place to store read value
5088 *
5089 * Read SCR register @reg of @ap into *@val. This function is
5090 * guaranteed to succeed if the cable type of the port is SATA
5091 * and the port implements ->scr_read.
5092 *
5093 * LOCKING:
5094 * None.
5095 *
5096 * RETURNS:
5097 * 0 on success, negative errno on failure.
5098 */
5099int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
5100{
5101 if (sata_scr_valid(ap)) {
5102 *val = ap->ops->scr_read(ap, reg);
5103 return 0;
5104 }
5105 return -EOPNOTSUPP;
5106}
5107
5108/**
5109 * sata_scr_write - write SCR register of the specified port
5110 * @ap: ATA port to write SCR for
5111 * @reg: SCR to write
5112 * @val: value to write
5113 *
5114 * Write @val to SCR register @reg of @ap. This function is
5115 * guaranteed to succeed if the cable type of the port is SATA
5116 * and the port implements ->scr_read.
5117 *
5118 * LOCKING:
5119 * None.
5120 *
5121 * RETURNS:
5122 * 0 on success, negative errno on failure.
5123 */
5124int sata_scr_write(struct ata_port *ap, int reg, u32 val)
5125{
5126 if (sata_scr_valid(ap)) {
5127 ap->ops->scr_write(ap, reg, val);
5128 return 0;
5129 }
5130 return -EOPNOTSUPP;
5131}
5132
5133/**
5134 * sata_scr_write_flush - write SCR register of the specified port and flush
5135 * @ap: ATA port to write SCR for
5136 * @reg: SCR to write
5137 * @val: value to write
5138 *
5139 * This function is identical to sata_scr_write() except that this
5140 * function performs flush after writing to the register.
5141 *
5142 * LOCKING:
5143 * None.
5144 *
5145 * RETURNS:
5146 * 0 on success, negative errno on failure.
5147 */
5148int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
5149{
5150 if (sata_scr_valid(ap)) {
5151 ap->ops->scr_write(ap, reg, val);
5152 ap->ops->scr_read(ap, reg);
5153 return 0;
5154 }
5155 return -EOPNOTSUPP;
5156}
5157
5158/**
5159 * ata_port_online - test whether the given port is online
5160 * @ap: ATA port to test
5161 *
5162 * Test whether @ap is online. Note that this function returns 0
5163 * if online status of @ap cannot be obtained, so
5164 * ata_port_online(ap) != !ata_port_offline(ap).
5165 *
5166 * LOCKING:
5167 * None.
5168 *
5169 * RETURNS:
5170 * 1 if the port online status is available and online.
5171 */
5172int ata_port_online(struct ata_port *ap)
5173{
5174 u32 sstatus;
5175
5176 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
5177 return 1;
5178 return 0;
5179}
5180
5181/**
5182 * ata_port_offline - test whether the given port is offline
5183 * @ap: ATA port to test
5184 *
5185 * Test whether @ap is offline. Note that this function returns
5186 * 0 if offline status of @ap cannot be obtained, so
5187 * ata_port_online(ap) != !ata_port_offline(ap).
5188 *
5189 * LOCKING:
5190 * None.
5191 *
5192 * RETURNS:
5193 * 1 if the port offline status is available and offline.
5194 */
5195int ata_port_offline(struct ata_port *ap)
5196{
5197 u32 sstatus;
5198
5199 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
5200 return 1;
5201 return 0;
5202}
Edward Falk0baab862005-06-02 18:17:13 -04005203
Tejun Heo77b08fb2006-06-24 20:30:19 +09005204int ata_flush_cache(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01005205{
Tejun Heo977e6b92006-06-24 20:30:19 +09005206 unsigned int err_mask;
Jens Axboe9b847542006-01-06 09:28:07 +01005207 u8 cmd;
5208
5209 if (!ata_try_flush_cache(dev))
5210 return 0;
5211
Tejun Heo6fc49ad2006-11-11 20:10:45 +09005212 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
Jens Axboe9b847542006-01-06 09:28:07 +01005213 cmd = ATA_CMD_FLUSH_EXT;
5214 else
5215 cmd = ATA_CMD_FLUSH;
5216
Tejun Heo977e6b92006-06-24 20:30:19 +09005217 err_mask = ata_do_simple_cmd(dev, cmd);
5218 if (err_mask) {
5219 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
5220 return -EIO;
5221 }
5222
5223 return 0;
Jens Axboe9b847542006-01-06 09:28:07 +01005224}
5225
Jeff Garzikcca39742006-08-24 03:19:22 -04005226static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5227 unsigned int action, unsigned int ehi_flags,
5228 int wait)
Tejun Heo500530f2006-07-03 16:07:27 +09005229{
5230 unsigned long flags;
5231 int i, rc;
5232
Jeff Garzikcca39742006-08-24 03:19:22 -04005233 for (i = 0; i < host->n_ports; i++) {
5234 struct ata_port *ap = host->ports[i];
Tejun Heo500530f2006-07-03 16:07:27 +09005235
5236 /* Previous resume operation might still be in
5237 * progress. Wait for PM_PENDING to clear.
5238 */
5239 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5240 ata_port_wait_eh(ap);
5241 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5242 }
5243
5244 /* request PM ops to EH */
5245 spin_lock_irqsave(ap->lock, flags);
5246
5247 ap->pm_mesg = mesg;
5248 if (wait) {
5249 rc = 0;
5250 ap->pm_result = &rc;
5251 }
5252
5253 ap->pflags |= ATA_PFLAG_PM_PENDING;
5254 ap->eh_info.action |= action;
5255 ap->eh_info.flags |= ehi_flags;
5256
5257 ata_port_schedule_eh(ap);
5258
5259 spin_unlock_irqrestore(ap->lock, flags);
5260
5261 /* wait and check result */
5262 if (wait) {
5263 ata_port_wait_eh(ap);
5264 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5265 if (rc)
5266 return rc;
5267 }
5268 }
5269
5270 return 0;
5271}
5272
5273/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005274 * ata_host_suspend - suspend host
5275 * @host: host to suspend
Tejun Heo500530f2006-07-03 16:07:27 +09005276 * @mesg: PM message
5277 *
Jeff Garzikcca39742006-08-24 03:19:22 -04005278 * Suspend @host. Actual operation is performed by EH. This
Tejun Heo500530f2006-07-03 16:07:27 +09005279 * function requests EH to perform PM operations and waits for EH
5280 * to finish.
5281 *
5282 * LOCKING:
5283 * Kernel thread context (may sleep).
5284 *
5285 * RETURNS:
5286 * 0 on success, -errno on failure.
5287 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005288int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
Tejun Heo500530f2006-07-03 16:07:27 +09005289{
5290 int i, j, rc;
5291
Jeff Garzikcca39742006-08-24 03:19:22 -04005292 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
Tejun Heo500530f2006-07-03 16:07:27 +09005293 if (rc)
5294 goto fail;
5295
5296 /* EH is quiescent now. Fail if we have any ready device.
5297 * This happens if hotplug occurs between completion of device
5298 * suspension and here.
5299 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005300 for (i = 0; i < host->n_ports; i++) {
5301 struct ata_port *ap = host->ports[i];
Tejun Heo500530f2006-07-03 16:07:27 +09005302
5303 for (j = 0; j < ATA_MAX_DEVICES; j++) {
5304 struct ata_device *dev = &ap->device[j];
5305
5306 if (ata_dev_ready(dev)) {
5307 ata_port_printk(ap, KERN_WARNING,
5308 "suspend failed, device %d "
5309 "still active\n", dev->devno);
5310 rc = -EBUSY;
5311 goto fail;
5312 }
5313 }
5314 }
5315
Jeff Garzikcca39742006-08-24 03:19:22 -04005316 host->dev->power.power_state = mesg;
Tejun Heo500530f2006-07-03 16:07:27 +09005317 return 0;
5318
5319 fail:
Jeff Garzikcca39742006-08-24 03:19:22 -04005320 ata_host_resume(host);
Tejun Heo500530f2006-07-03 16:07:27 +09005321 return rc;
5322}
5323
5324/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005325 * ata_host_resume - resume host
5326 * @host: host to resume
Tejun Heo500530f2006-07-03 16:07:27 +09005327 *
Jeff Garzikcca39742006-08-24 03:19:22 -04005328 * Resume @host. Actual operation is performed by EH. This
Tejun Heo500530f2006-07-03 16:07:27 +09005329 * function requests EH to perform PM operations and returns.
5330 * Note that all resume operations are performed parallely.
5331 *
5332 * LOCKING:
5333 * Kernel thread context (may sleep).
5334 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005335void ata_host_resume(struct ata_host *host)
Tejun Heo500530f2006-07-03 16:07:27 +09005336{
Jeff Garzikcca39742006-08-24 03:19:22 -04005337 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
5338 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5339 host->dev->power.power_state = PMSG_ON;
Tejun Heo500530f2006-07-03 16:07:27 +09005340}
5341
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005342/**
5343 * ata_port_start - Set port up for dma.
5344 * @ap: Port to initialize
5345 *
5346 * Called just after data structures for each port are
5347 * initialized. Allocates space for PRD table.
5348 *
5349 * May be used as the port_start() entry in ata_port_operations.
5350 *
5351 * LOCKING:
5352 * Inherited from caller.
5353 */
Tejun Heof0d36ef2007-01-20 16:00:28 +09005354int ata_port_start(struct ata_port *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005355{
Brian King2f1f6102006-03-23 17:30:15 -06005356 struct device *dev = ap->dev;
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005357 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005358
Tejun Heof0d36ef2007-01-20 16:00:28 +09005359 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5360 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005361 if (!ap->prd)
5362 return -ENOMEM;
5363
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005364 rc = ata_pad_alloc(ap, dev);
Tejun Heof0d36ef2007-01-20 16:00:28 +09005365 if (rc)
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005366 return rc;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04005367
Tejun Heof0d36ef2007-01-20 16:00:28 +09005368 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
5369 (unsigned long long)ap->prd_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005370 return 0;
5371}
5372
Edward Falk0baab862005-06-02 18:17:13 -04005373/**
Tejun Heo3ef3b432006-05-31 18:27:30 +09005374 * ata_dev_init - Initialize an ata_device structure
5375 * @dev: Device structure to initialize
5376 *
5377 * Initialize @dev in preparation for probing.
5378 *
5379 * LOCKING:
5380 * Inherited from caller.
5381 */
5382void ata_dev_init(struct ata_device *dev)
5383{
5384 struct ata_port *ap = dev->ap;
Tejun Heo72fa4b72006-05-31 18:27:32 +09005385 unsigned long flags;
Tejun Heo3ef3b432006-05-31 18:27:30 +09005386
Tejun Heo5a04bf42006-05-31 18:27:38 +09005387 /* SATA spd limit is bound to the first device */
5388 ap->sata_spd_limit = ap->hw_sata_spd_limit;
5389
Tejun Heo72fa4b72006-05-31 18:27:32 +09005390 /* High bits of dev->flags are used to record warm plug
5391 * requests which occur asynchronously. Synchronize using
Jeff Garzikcca39742006-08-24 03:19:22 -04005392 * host lock.
Tejun Heo72fa4b72006-05-31 18:27:32 +09005393 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005394 spin_lock_irqsave(ap->lock, flags);
Tejun Heo72fa4b72006-05-31 18:27:32 +09005395 dev->flags &= ~ATA_DFLAG_INIT_MASK;
Jeff Garzikba6a1302006-06-22 23:46:10 -04005396 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo72fa4b72006-05-31 18:27:32 +09005397
5398 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5399 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
Tejun Heo3ef3b432006-05-31 18:27:30 +09005400 dev->pio_mask = UINT_MAX;
5401 dev->mwdma_mask = UINT_MAX;
5402 dev->udma_mask = UINT_MAX;
5403}
5404
5405/**
Brian King155a8a92006-08-07 14:27:17 -05005406 * ata_port_init - Initialize an ata_port structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07005407 * @ap: Structure to initialize
Jeff Garzikcca39742006-08-24 03:19:22 -04005408 * @host: Collection of hosts to which @ap belongs
Linus Torvalds1da177e2005-04-16 15:20:36 -07005409 * @ent: Probe information provided by low-level driver
5410 * @port_no: Port number associated with this ata_port
5411 *
Brian King155a8a92006-08-07 14:27:17 -05005412 * Initialize a new ata_port structure.
Jeff Garzik0cba6322005-05-30 19:49:12 -04005413 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005414 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005415 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005416 */
Jeff Garzikcca39742006-08-24 03:19:22 -04005417void ata_port_init(struct ata_port *ap, struct ata_host *host,
Brian King155a8a92006-08-07 14:27:17 -05005418 const struct ata_probe_ent *ent, unsigned int port_no)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005419{
5420 unsigned int i;
5421
Jeff Garzikcca39742006-08-24 03:19:22 -04005422 ap->lock = &host->lock;
Tejun Heo198e0fe2006-04-02 18:51:52 +09005423 ap->flags = ATA_FLAG_DISABLED;
Brian King155a8a92006-08-07 14:27:17 -05005424 ap->id = ata_unique_id++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005425 ap->ctl = ATA_DEVCTL_OBS;
Jeff Garzikcca39742006-08-24 03:19:22 -04005426 ap->host = host;
Brian King2f1f6102006-03-23 17:30:15 -06005427 ap->dev = ent->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005428 ap->port_no = port_no;
Tejun Heofea63e32006-09-16 03:04:15 +09005429 if (port_no == 1 && ent->pinfo2) {
5430 ap->pio_mask = ent->pinfo2->pio_mask;
5431 ap->mwdma_mask = ent->pinfo2->mwdma_mask;
5432 ap->udma_mask = ent->pinfo2->udma_mask;
5433 ap->flags |= ent->pinfo2->flags;
5434 ap->ops = ent->pinfo2->port_ops;
5435 } else {
5436 ap->pio_mask = ent->pio_mask;
5437 ap->mwdma_mask = ent->mwdma_mask;
5438 ap->udma_mask = ent->udma_mask;
5439 ap->flags |= ent->port_flags;
5440 ap->ops = ent->port_ops;
5441 }
Tejun Heo5a04bf42006-05-31 18:27:38 +09005442 ap->hw_sata_spd_limit = UINT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005443 ap->active_tag = ATA_TAG_POISON;
5444 ap->last_ctl = 0xFF;
Borislav Petkovbd5d8252006-06-11 23:17:01 -04005445
5446#if defined(ATA_VERBOSE_DEBUG)
5447 /* turn on all debugging levels */
5448 ap->msg_enable = 0x00FF;
5449#elif defined(ATA_DEBUG)
5450 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 +09005451#else
Borislav Petkov0dd4b212006-06-23 02:29:08 -04005452 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
Borislav Petkovbd5d8252006-06-11 23:17:01 -04005453#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07005454
David Howells65f27f32006-11-22 14:55:48 +00005455 INIT_DELAYED_WORK(&ap->port_task, NULL);
5456 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5457 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09005458 INIT_LIST_HEAD(&ap->eh_done_q);
Tejun Heoc6cf9e92006-05-31 18:27:27 +09005459 init_waitqueue_head(&ap->eh_wait_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005460
Tejun Heo838df622006-05-15 20:57:44 +09005461 /* set cable type */
5462 ap->cbl = ATA_CBL_NONE;
5463 if (ap->flags & ATA_FLAG_SATA)
5464 ap->cbl = ATA_CBL_SATA;
5465
Tejun Heoacf356b2006-03-24 14:07:50 +09005466 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5467 struct ata_device *dev = &ap->device[i];
Tejun Heo38d87232006-05-15 20:57:51 +09005468 dev->ap = ap;
Tejun Heo72fa4b72006-05-31 18:27:32 +09005469 dev->devno = i;
Tejun Heo3ef3b432006-05-31 18:27:30 +09005470 ata_dev_init(dev);
Tejun Heoacf356b2006-03-24 14:07:50 +09005471 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005472
5473#ifdef ATA_IRQ_TRAP
5474 ap->stats.unhandled_irq = 1;
5475 ap->stats.idle_irq = 1;
5476#endif
5477
5478 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
5479}
5480
5481/**
Tejun Heo4608c162006-08-10 16:59:01 +09005482 * ata_port_init_shost - Initialize SCSI host associated with ATA port
5483 * @ap: ATA port to initialize SCSI host for
5484 * @shost: SCSI host associated with @ap
Brian King155a8a92006-08-07 14:27:17 -05005485 *
Tejun Heo4608c162006-08-10 16:59:01 +09005486 * Initialize SCSI host @shost associated with ATA port @ap.
Brian King155a8a92006-08-07 14:27:17 -05005487 *
5488 * LOCKING:
5489 * Inherited from caller.
5490 */
Tejun Heo4608c162006-08-10 16:59:01 +09005491static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
Brian King155a8a92006-08-07 14:27:17 -05005492{
Jeff Garzikcca39742006-08-24 03:19:22 -04005493 ap->scsi_host = shost;
Brian King155a8a92006-08-07 14:27:17 -05005494
Tejun Heo4608c162006-08-10 16:59:01 +09005495 shost->unique_id = ap->id;
5496 shost->max_id = 16;
5497 shost->max_lun = 1;
5498 shost->max_channel = 1;
5499 shost->max_cmd_len = 12;
Brian King155a8a92006-08-07 14:27:17 -05005500}
5501
5502/**
Jeff Garzik996139f2006-08-10 16:59:03 +09005503 * ata_port_add - Attach low-level ATA driver to system
Linus Torvalds1da177e2005-04-16 15:20:36 -07005504 * @ent: Information provided by low-level driver
Jeff Garzikcca39742006-08-24 03:19:22 -04005505 * @host: Collections of ports to which we add
Linus Torvalds1da177e2005-04-16 15:20:36 -07005506 * @port_no: Port number associated with this host
5507 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005508 * Attach low-level ATA driver to system.
5509 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005510 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005511 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005512 *
5513 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005514 * New ata_port on success, for NULL on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005515 */
Jeff Garzik996139f2006-08-10 16:59:03 +09005516static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
Jeff Garzikcca39742006-08-24 03:19:22 -04005517 struct ata_host *host,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005518 unsigned int port_no)
5519{
Jeff Garzik996139f2006-08-10 16:59:03 +09005520 struct Scsi_Host *shost;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005521 struct ata_port *ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005522
5523 DPRINTK("ENTER\n");
Tejun Heoaec5c3c2006-03-25 01:33:34 +09005524
Tejun Heo52783c52006-05-31 18:28:22 +09005525 if (!ent->port_ops->error_handler &&
Jeff Garzikcca39742006-08-24 03:19:22 -04005526 !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
Tejun Heoaec5c3c2006-03-25 01:33:34 +09005527 printk(KERN_ERR "ata%u: no reset mechanism available\n",
5528 port_no);
5529 return NULL;
5530 }
5531
Jeff Garzik996139f2006-08-10 16:59:03 +09005532 shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
5533 if (!shost)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005534 return NULL;
5535
Jeff Garzik996139f2006-08-10 16:59:03 +09005536 shost->transportt = &ata_scsi_transport_template;
Tejun Heo30afc842006-03-18 18:40:14 +09005537
Jeff Garzik996139f2006-08-10 16:59:03 +09005538 ap = ata_shost_to_port(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005539
Jeff Garzikcca39742006-08-24 03:19:22 -04005540 ata_port_init(ap, host, ent, port_no);
Jeff Garzik996139f2006-08-10 16:59:03 +09005541 ata_port_init_shost(ap, shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005542
Linus Torvalds1da177e2005-04-16 15:20:36 -07005543 return ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005544}
5545
Tejun Heof0d36ef2007-01-20 16:00:28 +09005546static void ata_host_release(struct device *gendev, void *res)
5547{
5548 struct ata_host *host = dev_get_drvdata(gendev);
5549 int i;
5550
5551 for (i = 0; i < host->n_ports; i++) {
5552 struct ata_port *ap = host->ports[i];
5553
5554 if (!ap)
5555 continue;
5556
5557 if (ap->ops->port_stop)
5558 ap->ops->port_stop(ap);
5559
5560 scsi_host_put(ap->scsi_host);
5561 }
5562
5563 if (host->ops->host_stop)
5564 host->ops->host_stop(host);
5565}
5566
Linus Torvalds1da177e2005-04-16 15:20:36 -07005567/**
Jeff Garzikcca39742006-08-24 03:19:22 -04005568 * ata_sas_host_init - Initialize a host struct
5569 * @host: host to initialize
5570 * @dev: device host is attached to
5571 * @flags: host flags
5572 * @ops: port_ops
Brian Kingb03732f2006-08-07 14:27:10 -05005573 *
5574 * LOCKING:
5575 * PCI/etc. bus probe sem.
5576 *
5577 */
5578
Jeff Garzikcca39742006-08-24 03:19:22 -04005579void ata_host_init(struct ata_host *host, struct device *dev,
5580 unsigned long flags, const struct ata_port_operations *ops)
Brian Kingb03732f2006-08-07 14:27:10 -05005581{
Jeff Garzikcca39742006-08-24 03:19:22 -04005582 spin_lock_init(&host->lock);
5583 host->dev = dev;
5584 host->flags = flags;
5585 host->ops = ops;
Brian Kingb03732f2006-08-07 14:27:10 -05005586}
5587
5588/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04005589 * ata_device_add - Register hardware device with ATA and SCSI layers
5590 * @ent: Probe information describing hardware device to be registered
5591 *
5592 * This function processes the information provided in the probe
5593 * information struct @ent, allocates the necessary ATA and SCSI
5594 * host information structures, initializes them, and registers
5595 * everything with requisite kernel subsystems.
5596 *
5597 * This function requests irqs, probes the ATA bus, and probes
5598 * the SCSI bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005599 *
5600 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005601 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005602 *
5603 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005604 * Number of ports registered. Zero on error (no ports registered).
Linus Torvalds1da177e2005-04-16 15:20:36 -07005605 */
Jeff Garzik057ace52005-10-22 14:27:05 -04005606int ata_device_add(const struct ata_probe_ent *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005607{
Jeff Garzik6d0500d2006-08-10 16:59:05 +09005608 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005609 struct device *dev = ent->dev;
Jeff Garzikcca39742006-08-24 03:19:22 -04005610 struct ata_host *host;
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005611 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005612
5613 DPRINTK("ENTER\n");
Jeff Garzikf20b16f2006-12-11 11:14:06 -05005614
Alan Cox02f076a2006-09-26 17:35:32 +01005615 if (ent->irq == 0) {
5616 dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
5617 return 0;
5618 }
Tejun Heof0d36ef2007-01-20 16:00:28 +09005619
5620 if (!devres_open_group(dev, ata_device_add, GFP_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005621 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005622
Tejun Heof0d36ef2007-01-20 16:00:28 +09005623 /* alloc a container for our list of ATA ports (buses) */
5624 host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
5625 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
5626 if (!host)
5627 goto err_out;
5628 devres_add(dev, host);
5629 dev_set_drvdata(dev, host);
5630
Jeff Garzikcca39742006-08-24 03:19:22 -04005631 ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
5632 host->n_ports = ent->n_ports;
5633 host->irq = ent->irq;
5634 host->irq2 = ent->irq2;
Tejun Heo0d5ff562007-02-01 15:06:36 +09005635 host->iomap = ent->iomap;
Jeff Garzikcca39742006-08-24 03:19:22 -04005636 host->private_data = ent->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005637
5638 /* register each port bound to this device */
Jeff Garzikcca39742006-08-24 03:19:22 -04005639 for (i = 0; i < host->n_ports; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005640 struct ata_port *ap;
5641 unsigned long xfer_mode_mask;
Alan Cox2ec7df02006-08-10 16:59:10 +09005642 int irq_line = ent->irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005643
Jeff Garzikcca39742006-08-24 03:19:22 -04005644 ap = ata_port_add(ent, host, i);
Dave Jonesc38778c2006-09-26 23:52:50 -07005645 host->ports[i] = ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005646 if (!ap)
5647 goto err_out;
5648
Tejun Heodd5b06c2006-08-10 16:59:12 +09005649 /* dummy? */
5650 if (ent->dummy_port_mask & (1 << i)) {
5651 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5652 ap->ops = &ata_dummy_port_ops;
5653 continue;
5654 }
5655
5656 /* start port */
5657 rc = ap->ops->port_start(ap);
5658 if (rc) {
Jeff Garzikcca39742006-08-24 03:19:22 -04005659 host->ports[i] = NULL;
5660 scsi_host_put(ap->scsi_host);
Tejun Heodd5b06c2006-08-10 16:59:12 +09005661 goto err_out;
5662 }
5663
Alan Cox2ec7df02006-08-10 16:59:10 +09005664 /* Report the secondary IRQ for second channel legacy */
5665 if (i == 1 && ent->irq2)
5666 irq_line = ent->irq2;
5667
Linus Torvalds1da177e2005-04-16 15:20:36 -07005668 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
5669 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
5670 (ap->pio_mask << ATA_SHIFT_PIO);
5671
5672 /* print per-port info to dmesg */
Tejun Heo0d5ff562007-02-01 15:06:36 +09005673 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
5674 "ctl 0x%p bmdma 0x%p irq %d\n",
Tejun Heof15a1da2006-05-15 20:57:56 +09005675 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
5676 ata_mode_string(xfer_mode_mask),
5677 ap->ioaddr.cmd_addr,
5678 ap->ioaddr.ctl_addr,
5679 ap->ioaddr.bmdma_addr,
Alan Cox2ec7df02006-08-10 16:59:10 +09005680 irq_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005681
Tejun Heo0f0a3ad2006-11-17 12:24:22 +09005682 /* freeze port before requesting IRQ */
5683 ata_eh_freeze_port(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005684 }
5685
Alan Cox2ec7df02006-08-10 16:59:10 +09005686 /* obtain irq, that may be shared between channels */
Tejun Heof0d36ef2007-01-20 16:00:28 +09005687 rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
5688 ent->irq_flags, DRV_NAME, host);
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005689 if (rc) {
5690 dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
5691 ent->irq, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005692 goto err_out;
Jeff Garzik39b07ce2006-06-11 23:59:44 -04005693 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005694
Alan Cox2ec7df02006-08-10 16:59:10 +09005695 /* do we have a second IRQ for the other channel, eg legacy mode */
5696 if (ent->irq2) {
5697 /* We will get weird core code crashes later if this is true
5698 so trap it now */
5699 BUG_ON(ent->irq == ent->irq2);
5700
Tejun Heof0d36ef2007-01-20 16:00:28 +09005701 rc = devm_request_irq(dev, ent->irq2,
5702 ent->port_ops->irq_handler, ent->irq_flags,
5703 DRV_NAME, host);
Alan Cox2ec7df02006-08-10 16:59:10 +09005704 if (rc) {
5705 dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
5706 ent->irq2, rc);
Tejun Heof0d36ef2007-01-20 16:00:28 +09005707 goto err_out;
Alan Cox2ec7df02006-08-10 16:59:10 +09005708 }
5709 }
5710
Tejun Heof0d36ef2007-01-20 16:00:28 +09005711 /* resource acquisition complete */
Tejun Heob878ca52007-01-20 16:00:28 +09005712 devres_remove_group(dev, ata_device_add);
Tejun Heof0d36ef2007-01-20 16:00:28 +09005713
Linus Torvalds1da177e2005-04-16 15:20:36 -07005714 /* perform each probe synchronously */
5715 DPRINTK("probe begin\n");
Jeff Garzikcca39742006-08-24 03:19:22 -04005716 for (i = 0; i < host->n_ports; i++) {
5717 struct ata_port *ap = host->ports[i];
Tejun Heo5a04bf42006-05-31 18:27:38 +09005718 u32 scontrol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005719 int rc;
5720
Tejun Heo5a04bf42006-05-31 18:27:38 +09005721 /* init sata_spd_limit to the current value */
5722 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
5723 int spd = (scontrol >> 4) & 0xf;
5724 ap->hw_sata_spd_limit &= (1 << spd) - 1;
5725 }
5726 ap->sata_spd_limit = ap->hw_sata_spd_limit;
5727
Jeff Garzikcca39742006-08-24 03:19:22 -04005728 rc = scsi_add_host(ap->scsi_host, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005729 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09005730 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005731 /* FIXME: do something useful here */
5732 /* FIXME: handle unconditional calls to
5733 * scsi_scan_host and ata_host_remove, below,
5734 * at the very least
5735 */
5736 }
Tejun Heo3e706392006-05-31 18:28:11 +09005737
Tejun Heo52783c52006-05-31 18:28:22 +09005738 if (ap->ops->error_handler) {
Tejun Heo1cdaf532006-07-03 16:07:26 +09005739 struct ata_eh_info *ehi = &ap->eh_info;
Tejun Heo3e706392006-05-31 18:28:11 +09005740 unsigned long flags;
5741
5742 ata_port_probe(ap);
5743
5744 /* kick EH for boot probing */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005745 spin_lock_irqsave(ap->lock, flags);
Tejun Heo3e706392006-05-31 18:28:11 +09005746
Tejun Heo1cdaf532006-07-03 16:07:26 +09005747 ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
5748 ehi->action |= ATA_EH_SOFTRESET;
5749 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
Tejun Heo3e706392006-05-31 18:28:11 +09005750
Tejun Heob51e9e52006-06-29 01:29:30 +09005751 ap->pflags |= ATA_PFLAG_LOADING;
Tejun Heo3e706392006-05-31 18:28:11 +09005752 ata_port_schedule_eh(ap);
5753
Jeff Garzikba6a1302006-06-22 23:46:10 -04005754 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo3e706392006-05-31 18:28:11 +09005755
5756 /* wait for EH to finish */
5757 ata_port_wait_eh(ap);
5758 } else {
5759 DPRINTK("ata%u: bus probe begin\n", ap->id);
5760 rc = ata_bus_probe(ap);
5761 DPRINTK("ata%u: bus probe end\n", ap->id);
5762
5763 if (rc) {
5764 /* FIXME: do something useful here?
5765 * Current libata behavior will
5766 * tear down everything when
5767 * the module is removed
5768 * or the h/w is unplugged.
5769 */
5770 }
5771 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005772 }
5773
5774 /* probes are done, now scan each port's disk(s) */
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005775 DPRINTK("host probe begin\n");
Jeff Garzikcca39742006-08-24 03:19:22 -04005776 for (i = 0; i < host->n_ports; i++) {
5777 struct ata_port *ap = host->ports[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07005778
Jeff Garzik644dd0c2005-10-03 15:55:19 -04005779 ata_scsi_scan_host(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005780 }
5781
Linus Torvalds1da177e2005-04-16 15:20:36 -07005782 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5783 return ent->n_ports; /* success */
5784
Tejun Heof0d36ef2007-01-20 16:00:28 +09005785 err_out:
5786 devres_release_group(dev, ata_device_add);
5787 dev_set_drvdata(dev, NULL);
5788 VPRINTK("EXIT, returning %d\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005789 return 0;
5790}
5791
5792/**
Tejun Heo720ba122006-05-31 18:28:13 +09005793 * ata_port_detach - Detach ATA port in prepration of device removal
5794 * @ap: ATA port to be detached
5795 *
5796 * Detach all ATA devices and the associated SCSI devices of @ap;
5797 * then, remove the associated SCSI host. @ap is guaranteed to
5798 * be quiescent on return from this function.
5799 *
5800 * LOCKING:
5801 * Kernel thread context (may sleep).
5802 */
5803void ata_port_detach(struct ata_port *ap)
5804{
5805 unsigned long flags;
5806 int i;
5807
5808 if (!ap->ops->error_handler)
Tejun Heoc3cf30a2006-08-05 03:59:11 +09005809 goto skip_eh;
Tejun Heo720ba122006-05-31 18:28:13 +09005810
5811 /* tell EH we're leaving & flush EH */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005812 spin_lock_irqsave(ap->lock, flags);
Tejun Heob51e9e52006-06-29 01:29:30 +09005813 ap->pflags |= ATA_PFLAG_UNLOADING;
Jeff Garzikba6a1302006-06-22 23:46:10 -04005814 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005815
5816 ata_port_wait_eh(ap);
5817
5818 /* EH is now guaranteed to see UNLOADING, so no new device
5819 * will be attached. Disable all existing devices.
5820 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005821 spin_lock_irqsave(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005822
5823 for (i = 0; i < ATA_MAX_DEVICES; i++)
5824 ata_dev_disable(&ap->device[i]);
5825
Jeff Garzikba6a1302006-06-22 23:46:10 -04005826 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005827
5828 /* Final freeze & EH. All in-flight commands are aborted. EH
5829 * will be skipped and retrials will be terminated with bad
5830 * target.
5831 */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005832 spin_lock_irqsave(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005833 ata_port_freeze(ap); /* won't be thawed */
Jeff Garzikba6a1302006-06-22 23:46:10 -04005834 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo720ba122006-05-31 18:28:13 +09005835
5836 ata_port_wait_eh(ap);
5837
5838 /* Flush hotplug task. The sequence is similar to
5839 * ata_port_flush_task().
5840 */
5841 flush_workqueue(ata_aux_wq);
5842 cancel_delayed_work(&ap->hotplug_task);
5843 flush_workqueue(ata_aux_wq);
5844
Tejun Heoc3cf30a2006-08-05 03:59:11 +09005845 skip_eh:
Tejun Heo720ba122006-05-31 18:28:13 +09005846 /* remove the associated SCSI host */
Jeff Garzikcca39742006-08-24 03:19:22 -04005847 scsi_remove_host(ap->scsi_host);
Tejun Heo720ba122006-05-31 18:28:13 +09005848}
5849
5850/**
Tejun Heo0529c1592007-01-20 16:00:26 +09005851 * ata_host_detach - Detach all ports of an ATA host
5852 * @host: Host to detach
5853 *
5854 * Detach all ports of @host.
5855 *
5856 * LOCKING:
5857 * Kernel thread context (may sleep).
5858 */
5859void ata_host_detach(struct ata_host *host)
5860{
5861 int i;
5862
5863 for (i = 0; i < host->n_ports; i++)
5864 ata_port_detach(host->ports[i]);
5865}
5866
Brian Kingf6d950e2006-08-07 14:27:24 -05005867struct ata_probe_ent *
5868ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
5869{
5870 struct ata_probe_ent *probe_ent;
5871
Tejun Heof0d36ef2007-01-20 16:00:28 +09005872 /* XXX - the following if can go away once all LLDs are managed */
5873 if (!list_empty(&dev->devres_head))
5874 probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
5875 else
5876 probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
Brian Kingf6d950e2006-08-07 14:27:24 -05005877 if (!probe_ent) {
5878 printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
5879 kobject_name(&(dev->kobj)));
5880 return NULL;
5881 }
5882
5883 INIT_LIST_HEAD(&probe_ent->node);
5884 probe_ent->dev = dev;
5885
5886 probe_ent->sht = port->sht;
Jeff Garzikcca39742006-08-24 03:19:22 -04005887 probe_ent->port_flags = port->flags;
Brian Kingf6d950e2006-08-07 14:27:24 -05005888 probe_ent->pio_mask = port->pio_mask;
5889 probe_ent->mwdma_mask = port->mwdma_mask;
5890 probe_ent->udma_mask = port->udma_mask;
5891 probe_ent->port_ops = port->port_ops;
Jeff Garzikd639ca92006-09-28 03:48:18 -04005892 probe_ent->private_data = port->private_data;
Brian Kingf6d950e2006-08-07 14:27:24 -05005893
5894 return probe_ent;
5895}
5896
Linus Torvalds1da177e2005-04-16 15:20:36 -07005897/**
5898 * ata_std_ports - initialize ioaddr with standard port offsets.
5899 * @ioaddr: IO address structure to be initialized
Edward Falk0baab862005-06-02 18:17:13 -04005900 *
5901 * Utility function which initializes data_addr, error_addr,
5902 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5903 * device_addr, status_addr, and command_addr to standard offsets
5904 * relative to cmd_addr.
5905 *
5906 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005907 */
Edward Falk0baab862005-06-02 18:17:13 -04005908
Linus Torvalds1da177e2005-04-16 15:20:36 -07005909void ata_std_ports(struct ata_ioports *ioaddr)
5910{
5911 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5912 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5913 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5914 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5915 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5916 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5917 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5918 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5919 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5920 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5921}
5922
Edward Falk0baab862005-06-02 18:17:13 -04005923
Jeff Garzik374b1872005-08-30 05:42:52 -04005924#ifdef CONFIG_PCI
5925
Edward Falk0baab862005-06-02 18:17:13 -04005926/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005927 * ata_pci_remove_one - PCI layer callback for device removal
5928 * @pdev: PCI device that was removed
5929 *
Tejun Heob878ca52007-01-20 16:00:28 +09005930 * PCI layer indicates to libata via this hook that hot-unplug or
5931 * module unload event has occurred. Detach all ports. Resource
5932 * release is handled via devres.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005933 *
5934 * LOCKING:
5935 * Inherited from PCI layer (may sleep).
5936 */
Tejun Heof0d36ef2007-01-20 16:00:28 +09005937void ata_pci_remove_one(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005938{
5939 struct device *dev = pci_dev_to_dev(pdev);
Jeff Garzikcca39742006-08-24 03:19:22 -04005940 struct ata_host *host = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005941
Tejun Heob878ca52007-01-20 16:00:28 +09005942 ata_host_detach(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005943}
5944
5945/* move to PCI subsystem */
Jeff Garzik057ace52005-10-22 14:27:05 -04005946int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005947{
5948 unsigned long tmp = 0;
5949
5950 switch (bits->width) {
5951 case 1: {
5952 u8 tmp8 = 0;
5953 pci_read_config_byte(pdev, bits->reg, &tmp8);
5954 tmp = tmp8;
5955 break;
5956 }
5957 case 2: {
5958 u16 tmp16 = 0;
5959 pci_read_config_word(pdev, bits->reg, &tmp16);
5960 tmp = tmp16;
5961 break;
5962 }
5963 case 4: {
5964 u32 tmp32 = 0;
5965 pci_read_config_dword(pdev, bits->reg, &tmp32);
5966 tmp = tmp32;
5967 break;
5968 }
5969
5970 default:
5971 return -EINVAL;
5972 }
5973
5974 tmp &= bits->mask;
5975
5976 return (tmp == bits->val) ? 1 : 0;
5977}
Jens Axboe9b847542006-01-06 09:28:07 +01005978
Tejun Heo3c5100c2006-07-26 16:58:33 +09005979void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
Jens Axboe9b847542006-01-06 09:28:07 +01005980{
5981 pci_save_state(pdev);
Tejun Heo500530f2006-07-03 16:07:27 +09005982
Tejun Heo3c5100c2006-07-26 16:58:33 +09005983 if (mesg.event == PM_EVENT_SUSPEND) {
Tejun Heo500530f2006-07-03 16:07:27 +09005984 pci_disable_device(pdev);
5985 pci_set_power_state(pdev, PCI_D3hot);
5986 }
Jens Axboe9b847542006-01-06 09:28:07 +01005987}
5988
Tejun Heo553c4aa2006-12-26 19:39:50 +09005989int ata_pci_device_do_resume(struct pci_dev *pdev)
Jens Axboe9b847542006-01-06 09:28:07 +01005990{
Tejun Heo553c4aa2006-12-26 19:39:50 +09005991 int rc;
5992
Jens Axboe9b847542006-01-06 09:28:07 +01005993 pci_set_power_state(pdev, PCI_D0);
5994 pci_restore_state(pdev);
Tejun Heo553c4aa2006-12-26 19:39:50 +09005995
Tejun Heob878ca52007-01-20 16:00:28 +09005996 rc = pcim_enable_device(pdev);
Tejun Heo553c4aa2006-12-26 19:39:50 +09005997 if (rc) {
5998 dev_printk(KERN_ERR, &pdev->dev,
5999 "failed to enable device after resume (%d)\n", rc);
6000 return rc;
6001 }
6002
Jens Axboe9b847542006-01-06 09:28:07 +01006003 pci_set_master(pdev);
Tejun Heo553c4aa2006-12-26 19:39:50 +09006004 return 0;
Tejun Heo500530f2006-07-03 16:07:27 +09006005}
6006
Tejun Heo3c5100c2006-07-26 16:58:33 +09006007int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
Tejun Heo500530f2006-07-03 16:07:27 +09006008{
Jeff Garzikcca39742006-08-24 03:19:22 -04006009 struct ata_host *host = dev_get_drvdata(&pdev->dev);
Tejun Heo500530f2006-07-03 16:07:27 +09006010 int rc = 0;
6011
Jeff Garzikcca39742006-08-24 03:19:22 -04006012 rc = ata_host_suspend(host, mesg);
Tejun Heo500530f2006-07-03 16:07:27 +09006013 if (rc)
6014 return rc;
6015
Tejun Heo3c5100c2006-07-26 16:58:33 +09006016 ata_pci_device_do_suspend(pdev, mesg);
Tejun Heo500530f2006-07-03 16:07:27 +09006017
6018 return 0;
6019}
6020
6021int ata_pci_device_resume(struct pci_dev *pdev)
6022{
Jeff Garzikcca39742006-08-24 03:19:22 -04006023 struct ata_host *host = dev_get_drvdata(&pdev->dev);
Tejun Heo553c4aa2006-12-26 19:39:50 +09006024 int rc;
Tejun Heo500530f2006-07-03 16:07:27 +09006025
Tejun Heo553c4aa2006-12-26 19:39:50 +09006026 rc = ata_pci_device_do_resume(pdev);
6027 if (rc == 0)
6028 ata_host_resume(host);
6029 return rc;
Jens Axboe9b847542006-01-06 09:28:07 +01006030}
Linus Torvalds1da177e2005-04-16 15:20:36 -07006031#endif /* CONFIG_PCI */
6032
6033
Linus Torvalds1da177e2005-04-16 15:20:36 -07006034static int __init ata_init(void)
6035{
Andrew Mortona8601e52006-06-25 01:36:52 -07006036 ata_probe_timeout *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006037 ata_wq = create_workqueue("ata");
6038 if (!ata_wq)
6039 return -ENOMEM;
6040
Tejun Heo453b07a2006-05-31 18:27:42 +09006041 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6042 if (!ata_aux_wq) {
6043 destroy_workqueue(ata_wq);
6044 return -ENOMEM;
6045 }
6046
Linus Torvalds1da177e2005-04-16 15:20:36 -07006047 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6048 return 0;
6049}
6050
6051static void __exit ata_exit(void)
6052{
6053 destroy_workqueue(ata_wq);
Tejun Heo453b07a2006-05-31 18:27:42 +09006054 destroy_workqueue(ata_aux_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006055}
6056
Brian Kinga4625082006-11-13 16:32:36 -06006057subsys_initcall(ata_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006058module_exit(ata_exit);
6059
Jeff Garzik67846b32005-10-05 02:58:32 -04006060static unsigned long ratelimit_time;
Ingo Molnar34af9462006-06-27 02:53:55 -07006061static DEFINE_SPINLOCK(ata_ratelimit_lock);
Jeff Garzik67846b32005-10-05 02:58:32 -04006062
6063int ata_ratelimit(void)
6064{
6065 int rc;
6066 unsigned long flags;
6067
6068 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6069
6070 if (time_after(jiffies, ratelimit_time)) {
6071 rc = 1;
6072 ratelimit_time = jiffies + (HZ/5);
6073 } else
6074 rc = 0;
6075
6076 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6077
6078 return rc;
6079}
6080
Tejun Heoc22daff2006-04-11 22:22:29 +09006081/**
6082 * ata_wait_register - wait until register value changes
6083 * @reg: IO-mapped register
6084 * @mask: Mask to apply to read register value
6085 * @val: Wait condition
6086 * @interval_msec: polling interval in milliseconds
6087 * @timeout_msec: timeout in milliseconds
6088 *
6089 * Waiting for some bits of register to change is a common
6090 * operation for ATA controllers. This function reads 32bit LE
6091 * IO-mapped register @reg and tests for the following condition.
6092 *
6093 * (*@reg & mask) != val
6094 *
6095 * If the condition is met, it returns; otherwise, the process is
6096 * repeated after @interval_msec until timeout.
6097 *
6098 * LOCKING:
6099 * Kernel thread context (may sleep)
6100 *
6101 * RETURNS:
6102 * The final register value.
6103 */
6104u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6105 unsigned long interval_msec,
6106 unsigned long timeout_msec)
6107{
6108 unsigned long timeout;
6109 u32 tmp;
6110
6111 tmp = ioread32(reg);
6112
6113 /* Calculate timeout _after_ the first read to make sure
6114 * preceding writes reach the controller before starting to
6115 * eat away the timeout.
6116 */
6117 timeout = jiffies + (timeout_msec * HZ) / 1000;
6118
6119 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6120 msleep(interval_msec);
6121 tmp = ioread32(reg);
6122 }
6123
6124 return tmp;
6125}
6126
Linus Torvalds1da177e2005-04-16 15:20:36 -07006127/*
Tejun Heodd5b06c2006-08-10 16:59:12 +09006128 * Dummy port_ops
6129 */
6130static void ata_dummy_noret(struct ata_port *ap) { }
6131static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6132static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6133
6134static u8 ata_dummy_check_status(struct ata_port *ap)
6135{
6136 return ATA_DRDY;
6137}
6138
6139static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6140{
6141 return AC_ERR_SYSTEM;
6142}
6143
6144const struct ata_port_operations ata_dummy_port_ops = {
6145 .port_disable = ata_port_disable,
6146 .check_status = ata_dummy_check_status,
6147 .check_altstatus = ata_dummy_check_status,
6148 .dev_select = ata_noop_dev_select,
6149 .qc_prep = ata_noop_qc_prep,
6150 .qc_issue = ata_dummy_qc_issue,
6151 .freeze = ata_dummy_noret,
6152 .thaw = ata_dummy_noret,
6153 .error_handler = ata_dummy_noret,
6154 .post_internal_cmd = ata_dummy_qc_noret,
6155 .irq_clear = ata_dummy_noret,
6156 .port_start = ata_dummy_ret0,
6157 .port_stop = ata_dummy_noret,
6158};
6159
6160/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006161 * libata is essentially a library of internal helper functions for
6162 * low-level ATA host controller drivers. As such, the API/ABI is
6163 * likely to change as new drivers are added and updated.
6164 * Do not depend on ABI/API stability.
6165 */
6166
Tejun Heoe9c83912006-07-03 16:07:26 +09006167EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6168EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6169EXPORT_SYMBOL_GPL(sata_deb_timing_long);
Tejun Heodd5b06c2006-08-10 16:59:12 +09006170EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006171EXPORT_SYMBOL_GPL(ata_std_bios_param);
6172EXPORT_SYMBOL_GPL(ata_std_ports);
Jeff Garzikcca39742006-08-24 03:19:22 -04006173EXPORT_SYMBOL_GPL(ata_host_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006174EXPORT_SYMBOL_GPL(ata_device_add);
Tejun Heo0529c1592007-01-20 16:00:26 +09006175EXPORT_SYMBOL_GPL(ata_host_detach);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006176EXPORT_SYMBOL_GPL(ata_sg_init);
6177EXPORT_SYMBOL_GPL(ata_sg_init_one);
Tejun Heo9a1004d2006-05-31 18:27:52 +09006178EXPORT_SYMBOL_GPL(ata_hsm_move);
Tejun Heof686bcb2006-05-15 20:58:05 +09006179EXPORT_SYMBOL_GPL(ata_qc_complete);
Tejun Heodedaf2b2006-05-15 21:03:43 +09006180EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006181EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006182EXPORT_SYMBOL_GPL(ata_tf_load);
6183EXPORT_SYMBOL_GPL(ata_tf_read);
6184EXPORT_SYMBOL_GPL(ata_noop_dev_select);
6185EXPORT_SYMBOL_GPL(ata_std_dev_select);
6186EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6187EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6188EXPORT_SYMBOL_GPL(ata_check_status);
6189EXPORT_SYMBOL_GPL(ata_altstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006190EXPORT_SYMBOL_GPL(ata_exec_command);
6191EXPORT_SYMBOL_GPL(ata_port_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006192EXPORT_SYMBOL_GPL(ata_interrupt);
Tejun Heo0d5ff562007-02-01 15:06:36 +09006193EXPORT_SYMBOL_GPL(ata_data_xfer);
6194EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006195EXPORT_SYMBOL_GPL(ata_qc_prep);
Brian Kinge46834c2006-03-17 17:04:03 -06006196EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006197EXPORT_SYMBOL_GPL(ata_bmdma_setup);
6198EXPORT_SYMBOL_GPL(ata_bmdma_start);
6199EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
6200EXPORT_SYMBOL_GPL(ata_bmdma_status);
6201EXPORT_SYMBOL_GPL(ata_bmdma_stop);
Tejun Heo6d97dbd2006-05-15 20:58:24 +09006202EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
6203EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
6204EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
6205EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
6206EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006207EXPORT_SYMBOL_GPL(ata_port_probe);
Tejun Heo3c567b72006-05-15 20:57:23 +09006208EXPORT_SYMBOL_GPL(sata_set_spd);
Tejun Heod7bb4cc2006-05-31 18:27:46 +09006209EXPORT_SYMBOL_GPL(sata_phy_debounce);
6210EXPORT_SYMBOL_GPL(sata_phy_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006211EXPORT_SYMBOL_GPL(sata_phy_reset);
6212EXPORT_SYMBOL_GPL(__sata_phy_reset);
6213EXPORT_SYMBOL_GPL(ata_bus_reset);
Tejun Heof5914a42006-05-31 18:27:48 +09006214EXPORT_SYMBOL_GPL(ata_std_prereset);
Tejun Heoc2bd5802006-01-24 17:05:22 +09006215EXPORT_SYMBOL_GPL(ata_std_softreset);
Tejun Heob6103f62006-11-01 17:59:53 +09006216EXPORT_SYMBOL_GPL(sata_port_hardreset);
Tejun Heoc2bd5802006-01-24 17:05:22 +09006217EXPORT_SYMBOL_GPL(sata_std_hardreset);
6218EXPORT_SYMBOL_GPL(ata_std_postreset);
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05006219EXPORT_SYMBOL_GPL(ata_dev_classify);
6220EXPORT_SYMBOL_GPL(ata_dev_pair);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006221EXPORT_SYMBOL_GPL(ata_port_disable);
Jeff Garzik67846b32005-10-05 02:58:32 -04006222EXPORT_SYMBOL_GPL(ata_ratelimit);
Tejun Heoc22daff2006-04-11 22:22:29 +09006223EXPORT_SYMBOL_GPL(ata_wait_register);
Tejun Heo6f8b9952006-01-24 17:05:21 +09006224EXPORT_SYMBOL_GPL(ata_busy_sleep);
Tejun Heo86e45b62006-03-05 15:29:09 +09006225EXPORT_SYMBOL_GPL(ata_port_queue_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006226EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6227EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006228EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
Tejun Heo83c47bc2006-05-31 18:28:07 +09006229EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
Tejun Heoa6e6ce82006-05-15 21:03:48 +09006230EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006231EXPORT_SYMBOL_GPL(ata_host_intr);
Tejun Heo34bf2172006-05-15 20:57:46 +09006232EXPORT_SYMBOL_GPL(sata_scr_valid);
6233EXPORT_SYMBOL_GPL(sata_scr_read);
6234EXPORT_SYMBOL_GPL(sata_scr_write);
6235EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6236EXPORT_SYMBOL_GPL(ata_port_online);
6237EXPORT_SYMBOL_GPL(ata_port_offline);
Jeff Garzikcca39742006-08-24 03:19:22 -04006238EXPORT_SYMBOL_GPL(ata_host_suspend);
6239EXPORT_SYMBOL_GPL(ata_host_resume);
Tejun Heo6a62a042006-02-13 10:02:46 +09006240EXPORT_SYMBOL_GPL(ata_id_string);
6241EXPORT_SYMBOL_GPL(ata_id_c_string);
Alan Cox6919a0a2006-10-27 19:08:46 -07006242EXPORT_SYMBOL_GPL(ata_device_blacklisted);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006243EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6244
Alan Cox1bc4ccf2006-01-09 17:18:14 +00006245EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
Alan Cox452503f2005-10-21 19:01:32 -04006246EXPORT_SYMBOL_GPL(ata_timing_compute);
6247EXPORT_SYMBOL_GPL(ata_timing_merge);
6248
Linus Torvalds1da177e2005-04-16 15:20:36 -07006249#ifdef CONFIG_PCI
6250EXPORT_SYMBOL_GPL(pci_test_config_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006251EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
6252EXPORT_SYMBOL_GPL(ata_pci_init_one);
6253EXPORT_SYMBOL_GPL(ata_pci_remove_one);
Tejun Heo500530f2006-07-03 16:07:27 +09006254EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6255EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
Jens Axboe9b847542006-01-06 09:28:07 +01006256EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6257EXPORT_SYMBOL_GPL(ata_pci_device_resume);
Alan Cox67951ad2006-03-22 15:55:54 +00006258EXPORT_SYMBOL_GPL(ata_pci_default_filter);
6259EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006260#endif /* CONFIG_PCI */
Jens Axboe9b847542006-01-06 09:28:07 +01006261
Jens Axboe9b847542006-01-06 09:28:07 +01006262EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
6263EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
Tejun Heoece1d632006-04-02 18:51:53 +09006264
Tejun Heoece1d632006-04-02 18:51:53 +09006265EXPORT_SYMBOL_GPL(ata_eng_timeout);
Tejun Heo7b70fc02006-05-15 20:58:07 +09006266EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6267EXPORT_SYMBOL_GPL(ata_port_abort);
Tejun Heoe3180492006-05-15 20:58:09 +09006268EXPORT_SYMBOL_GPL(ata_port_freeze);
6269EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6270EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
Tejun Heoece1d632006-04-02 18:51:53 +09006271EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6272EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
Tejun Heo022bdb02006-05-15 20:58:22 +09006273EXPORT_SYMBOL_GPL(ata_do_eh);