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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
35#include <linux/config.h>
36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/pci.h>
39#include <linux/init.h>
40#include <linux/list.h>
41#include <linux/mm.h>
42#include <linux/highmem.h>
43#include <linux/spinlock.h>
44#include <linux/blkdev.h>
45#include <linux/delay.h>
46#include <linux/timer.h>
47#include <linux/interrupt.h>
48#include <linux/completion.h>
49#include <linux/suspend.h>
50#include <linux/workqueue.h>
Jeff Garzik67846b32005-10-05 02:58:32 -040051#include <linux/jiffies.h>
David Hardeman378f0582005-09-17 17:55:31 +100052#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <scsi/scsi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include "scsi_priv.h"
Jeff Garzik193515d2005-11-07 00:59:37 -050055#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <scsi/scsi_host.h>
57#include <linux/libata.h>
58#include <asm/io.h>
59#include <asm/semaphore.h>
60#include <asm/byteorder.h>
61
62#include "libata.h"
63
Tejun Heo3373efd2006-05-15 20:57:53 +090064static unsigned int ata_dev_init_params(struct ata_device *dev,
65 u16 heads, u16 sectors);
66static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
67static void ata_dev_xfermask(struct ata_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69static unsigned int ata_unique_id = 1;
70static struct workqueue_struct *ata_wq;
71
Jeff Garzik418dc1f2006-03-11 20:50:08 -050072int atapi_enabled = 1;
Jeff Garzik1623c812005-08-30 03:37:42 -040073module_param(atapi_enabled, int, 0444);
74MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
75
Albert Lee95de7192006-04-04 10:57:18 +080076int atapi_dmadir = 0;
77module_param(atapi_dmadir, int, 0444);
78MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
79
Jeff Garzikc3c013a2006-02-27 22:31:19 -050080int libata_fua = 0;
81module_param_named(fua, libata_fua, int, 0444);
82MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084MODULE_AUTHOR("Jeff Garzik");
85MODULE_DESCRIPTION("Library module for ATA devices");
86MODULE_LICENSE("GPL");
87MODULE_VERSION(DRV_VERSION);
88
Edward Falk0baab862005-06-02 18:17:13 -040089
90/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
95 *
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
98 *
99 * LOCKING:
100 * Inherited from caller.
101 */
102
Jeff Garzik057ace52005-10-22 14:27:05 -0400103void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 fis[0] = 0x27; /* Register - Host to Device FIS */
106 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis[2] = tf->command;
109 fis[3] = tf->feature;
110
111 fis[4] = tf->lbal;
112 fis[5] = tf->lbam;
113 fis[6] = tf->lbah;
114 fis[7] = tf->device;
115
116 fis[8] = tf->hob_lbal;
117 fis[9] = tf->hob_lbam;
118 fis[10] = tf->hob_lbah;
119 fis[11] = tf->hob_feature;
120
121 fis[12] = tf->nsect;
122 fis[13] = tf->hob_nsect;
123 fis[14] = 0;
124 fis[15] = tf->ctl;
125
126 fis[16] = 0;
127 fis[17] = 0;
128 fis[18] = 0;
129 fis[19] = 0;
130}
131
132/**
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
136 *
Mark Lorde12a1be2005-11-12 18:55:45 -0500137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 *
139 * LOCKING:
140 * Inherited from caller.
141 */
142
Jeff Garzik057ace52005-10-22 14:27:05 -0400143void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 tf->command = fis[2]; /* status */
146 tf->feature = fis[3]; /* error */
147
148 tf->lbal = fis[4];
149 tf->lbam = fis[5];
150 tf->lbah = fis[6];
151 tf->device = fis[7];
152
153 tf->hob_lbal = fis[8];
154 tf->hob_lbam = fis[9];
155 tf->hob_lbah = fis[10];
156
157 tf->nsect = fis[12];
158 tf->hob_nsect = fis[13];
159}
160
Albert Lee8cbd6df2005-10-12 15:06:27 +0800161static const u8 ata_rw_cmds[] = {
162 /* pio multi */
163 ATA_CMD_READ_MULTI,
164 ATA_CMD_WRITE_MULTI,
165 ATA_CMD_READ_MULTI_EXT,
166 ATA_CMD_WRITE_MULTI_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100167 0,
168 0,
169 0,
170 ATA_CMD_WRITE_MULTI_FUA_EXT,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800171 /* pio */
172 ATA_CMD_PIO_READ,
173 ATA_CMD_PIO_WRITE,
174 ATA_CMD_PIO_READ_EXT,
175 ATA_CMD_PIO_WRITE_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100176 0,
177 0,
178 0,
179 0,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800180 /* dma */
181 ATA_CMD_READ,
182 ATA_CMD_WRITE,
183 ATA_CMD_READ_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100184 ATA_CMD_WRITE_EXT,
185 0,
186 0,
187 0,
188 ATA_CMD_WRITE_FUA_EXT
Albert Lee8cbd6df2005-10-12 15:06:27 +0800189};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191/**
Albert Lee8cbd6df2005-10-12 15:06:27 +0800192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500195 * Examine the device configuration and tf->flags to calculate
Albert Lee8cbd6df2005-10-12 15:06:27 +0800196 * the proper read/write commands and protocol to use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 *
198 * LOCKING:
199 * caller.
200 */
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100201int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Albert Lee8cbd6df2005-10-12 15:06:27 +0800203 struct ata_taskfile *tf = &qc->tf;
204 struct ata_device *dev = qc->dev;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100205 u8 cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100207 int index, fua, lba48, write;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -0500208
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100209 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800210 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
211 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Albert Lee8cbd6df2005-10-12 15:06:27 +0800213 if (dev->flags & ATA_DFLAG_PIO) {
214 tf->protocol = ATA_PROT_PIO;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100215 index = dev->multi_count ? 0 : 8;
Alan Cox8d238e02006-01-17 20:50:31 +0000216 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
217 /* Unable to use DMA due to host limitation */
218 tf->protocol = ATA_PROT_PIO;
Albert Lee0565c262006-02-13 18:55:25 +0800219 index = dev->multi_count ? 0 : 8;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800220 } else {
221 tf->protocol = ATA_PROT_DMA;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100222 index = 16;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100225 cmd = ata_rw_cmds[index + fua + lba48 + write];
226 if (cmd) {
227 tf->command = cmd;
228 return 0;
229 }
230 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231}
232
Tejun Heocb95d562006-03-06 04:31:56 +0900233/**
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
238 *
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
241 *
242 * LOCKING:
243 * None.
244 *
245 * RETURNS:
246 * Packed xfer_mask.
247 */
248static unsigned int ata_pack_xfermask(unsigned int pio_mask,
249 unsigned int mwdma_mask,
250 unsigned int udma_mask)
251{
252 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
253 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
254 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
255}
256
Tejun Heoc0489e42006-03-24 14:07:49 +0900257/**
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
263 *
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
266 */
267static void ata_unpack_xfermask(unsigned int xfer_mask,
268 unsigned int *pio_mask,
269 unsigned int *mwdma_mask,
270 unsigned int *udma_mask)
271{
272 if (pio_mask)
273 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
274 if (mwdma_mask)
275 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
276 if (udma_mask)
277 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
278}
279
Tejun Heocb95d562006-03-06 04:31:56 +0900280static const struct ata_xfer_ent {
Tejun Heobe9a50c2006-03-31 22:48:52 +0900281 int shift, bits;
Tejun Heocb95d562006-03-06 04:31:56 +0900282 u8 base;
283} ata_xfer_tbl[] = {
284 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
285 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
286 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
287 { -1, },
288};
289
290/**
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
293 *
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
296 *
297 * LOCKING:
298 * None.
299 *
300 * RETURNS:
301 * Matching XFER_* value, 0 if no match found.
302 */
303static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
304{
305 int highbit = fls(xfer_mask) - 1;
306 const struct ata_xfer_ent *ent;
307
308 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
309 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
310 return ent->base + highbit - ent->shift;
311 return 0;
312}
313
314/**
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
317 *
318 * Return matching xfer_mask for @xfer_mode.
319 *
320 * LOCKING:
321 * None.
322 *
323 * RETURNS:
324 * Matching xfer_mask, 0 if no match found.
325 */
326static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
327{
328 const struct ata_xfer_ent *ent;
329
330 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
331 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
332 return 1 << (ent->shift + xfer_mode - ent->base);
333 return 0;
334}
335
336/**
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
339 *
340 * Return matching xfer_shift for @xfer_mode.
341 *
342 * LOCKING:
343 * None.
344 *
345 * RETURNS:
346 * Matching xfer_shift, -1 if no match found.
347 */
348static int ata_xfer_mode2shift(unsigned int xfer_mode)
349{
350 const struct ata_xfer_ent *ent;
351
352 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
353 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
354 return ent->shift;
355 return -1;
356}
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358/**
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 *
362 * Determine string which represents the highest speed
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900363 * (highest bit in @modemask).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 *
365 * LOCKING:
366 * None.
367 *
368 * RETURNS:
369 * Constant C string representing highest speed listed in
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900370 * @mode_mask, or the constant C string "<n/a>".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 */
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900372static const char *ata_mode_string(unsigned int xfer_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Tejun Heo75f554b2006-03-06 04:31:57 +0900374 static const char * const xfer_mode_str[] = {
375 "PIO0",
376 "PIO1",
377 "PIO2",
378 "PIO3",
379 "PIO4",
380 "MWDMA0",
381 "MWDMA1",
382 "MWDMA2",
383 "UDMA/16",
384 "UDMA/25",
385 "UDMA/33",
386 "UDMA/44",
387 "UDMA/66",
388 "UDMA/100",
389 "UDMA/133",
390 "UDMA7",
391 };
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900392 int highbit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Tejun Heo1da7b0d2006-03-06 04:31:56 +0900394 highbit = fls(xfer_mask) - 1;
395 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
396 return xfer_mode_str[highbit];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return "<n/a>";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398}
399
Tejun Heo4c360c82006-04-01 01:38:17 +0900400static const char *sata_spd_string(unsigned int spd)
401{
402 static const char * const spd_str[] = {
403 "1.5 Gbps",
404 "3.0 Gbps",
405 };
406
407 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
408 return "<unknown>";
409 return spd_str[spd - 1];
410}
411
Tejun Heo3373efd2006-05-15 20:57:53 +0900412void ata_dev_disable(struct ata_device *dev)
Tejun Heo0b8efb02006-03-24 15:25:31 +0900413{
Tejun Heoe1211e32006-04-01 01:38:18 +0900414 if (ata_dev_enabled(dev)) {
Tejun Heof15a1da2006-05-15 20:57:56 +0900415 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
Tejun Heo0b8efb02006-03-24 15:25:31 +0900416 dev->class++;
417 }
418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420/**
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
424 *
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
428 *
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
433 *
434 * LOCKING:
435 * caller.
436 */
437
438static unsigned int ata_pio_devchk(struct ata_port *ap,
439 unsigned int device)
440{
441 struct ata_ioports *ioaddr = &ap->ioaddr;
442 u8 nsect, lbal;
443
444 ap->ops->dev_select(ap, device);
445
446 outb(0x55, ioaddr->nsect_addr);
447 outb(0xaa, ioaddr->lbal_addr);
448
449 outb(0xaa, ioaddr->nsect_addr);
450 outb(0x55, ioaddr->lbal_addr);
451
452 outb(0x55, ioaddr->nsect_addr);
453 outb(0xaa, ioaddr->lbal_addr);
454
455 nsect = inb(ioaddr->nsect_addr);
456 lbal = inb(ioaddr->lbal_addr);
457
458 if ((nsect == 0x55) && (lbal == 0xaa))
459 return 1; /* we found a device */
460
461 return 0; /* nothing found */
462}
463
464/**
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
468 *
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
472 *
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
477 *
478 * LOCKING:
479 * caller.
480 */
481
482static unsigned int ata_mmio_devchk(struct ata_port *ap,
483 unsigned int device)
484{
485 struct ata_ioports *ioaddr = &ap->ioaddr;
486 u8 nsect, lbal;
487
488 ap->ops->dev_select(ap, device);
489
490 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
491 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
492
493 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
494 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
495
496 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
498
499 nsect = readb((void __iomem *) ioaddr->nsect_addr);
500 lbal = readb((void __iomem *) ioaddr->lbal_addr);
501
502 if ((nsect == 0x55) && (lbal == 0xaa))
503 return 1; /* we found a device */
504
505 return 0; /* nothing found */
506}
507
508/**
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
512 *
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
516 *
517 * LOCKING:
518 * caller.
519 */
520
521static unsigned int ata_devchk(struct ata_port *ap,
522 unsigned int device)
523{
524 if (ap->flags & ATA_FLAG_MMIO)
525 return ata_mmio_devchk(ap, device);
526 return ata_pio_devchk(ap, device);
527}
528
529/**
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
532 *
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
536 *
537 * LOCKING:
538 * None.
539 *
540 * RETURNS:
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
543 */
544
Jeff Garzik057ace52005-10-22 14:27:05 -0400545unsigned int ata_dev_classify(const struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
550 */
551
552 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
553 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
555 return ATA_DEV_ATA;
556 }
557
558 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
559 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI;
562 }
563
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN;
566}
567
568/**
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
Tejun Heob4dc7622006-01-24 17:05:22 +0900572 * @r_err: Value of error register on completion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 *
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
577 * and diagnostics.
578 *
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
582 *
583 * LOCKING:
584 * caller.
Tejun Heob4dc7622006-01-24 17:05:22 +0900585 *
586 * RETURNS:
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 */
589
Tejun Heob4dc7622006-01-24 17:05:22 +0900590static unsigned int
591ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 struct ata_taskfile tf;
594 unsigned int class;
595 u8 err;
596
597 ap->ops->dev_select(ap, device);
598
599 memset(&tf, 0, sizeof(tf));
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 ap->ops->tf_read(ap, &tf);
Jeff Garzik0169e282005-10-29 21:25:10 -0400602 err = tf.feature;
Tejun Heob4dc7622006-01-24 17:05:22 +0900603 if (r_err)
604 *r_err = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606 /* see if device passed diags */
607 if (err == 1)
608 /* do nothing */ ;
609 else if ((device == 0) && (err == 0x81))
610 /* do nothing */ ;
611 else
Tejun Heob4dc7622006-01-24 17:05:22 +0900612 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Tejun Heob4dc7622006-01-24 17:05:22 +0900614 /* determine if device is ATA or ATAPI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 class = ata_dev_classify(&tf);
Tejun Heob4dc7622006-01-24 17:05:22 +0900616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (class == ATA_DEV_UNKNOWN)
Tejun Heob4dc7622006-01-24 17:05:22 +0900618 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
Tejun Heob4dc7622006-01-24 17:05:22 +0900620 return ATA_DEV_NONE;
621 return class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622}
623
624/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900625 * ata_id_string - Convert IDENTIFY DEVICE page into string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
630 *
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
634 *
635 * LOCKING:
636 * caller.
637 */
638
Tejun Heo6a62a042006-02-13 10:02:46 +0900639void ata_id_string(const u16 *id, unsigned char *s,
640 unsigned int ofs, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
642 unsigned int c;
643
644 while (len > 0) {
645 c = id[ofs] >> 8;
646 *s = c;
647 s++;
648
649 c = id[ofs] & 0xff;
650 *s = c;
651 s++;
652
653 ofs++;
654 len -= 2;
655 }
656}
657
Tejun Heo0e949ff2006-02-12 22:47:04 +0900658/**
Tejun Heo6a62a042006-02-13 10:02:46 +0900659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
Tejun Heo0e949ff2006-02-12 22:47:04 +0900660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
664 *
Tejun Heo6a62a042006-02-13 10:02:46 +0900665 * This function is identical to ata_id_string except that it
Tejun Heo0e949ff2006-02-12 22:47:04 +0900666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
668 *
669 * LOCKING:
670 * caller.
671 */
Tejun Heo6a62a042006-02-13 10:02:46 +0900672void ata_id_c_string(const u16 *id, unsigned char *s,
673 unsigned int ofs, unsigned int len)
Tejun Heo0e949ff2006-02-12 22:47:04 +0900674{
675 unsigned char *p;
676
677 WARN_ON(!(len & 1));
678
Tejun Heo6a62a042006-02-13 10:02:46 +0900679 ata_id_string(id, s, ofs, len - 1);
Tejun Heo0e949ff2006-02-12 22:47:04 +0900680
681 p = s + strnlen(s, len - 1);
682 while (p > s && p[-1] == ' ')
683 p--;
684 *p = '\0';
685}
Edward Falk0baab862005-06-02 18:17:13 -0400686
Tejun Heo29407402006-02-12 22:47:04 +0900687static u64 ata_id_n_sectors(const u16 *id)
688{
689 if (ata_id_has_lba(id)) {
690 if (ata_id_has_lba48(id))
691 return ata_id_u64(id, 100);
692 else
693 return ata_id_u32(id, 60);
694 } else {
695 if (ata_id_current_chs_valid(id))
696 return ata_id_u32(id, 57);
697 else
698 return id[1] * id[3] * id[6];
699 }
700}
701
Edward Falk0baab862005-06-02 18:17:13 -0400702/**
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
706 *
707 * This function performs no actual function.
708 *
709 * May be used as the dev_select() entry in ata_port_operations.
710 *
711 * LOCKING:
712 * caller.
713 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
715{
716}
717
Edward Falk0baab862005-06-02 18:17:13 -0400718
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719/**
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
723 *
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
Edward Falk0baab862005-06-02 18:17:13 -0400726 * ATA channel. Works with both PIO and MMIO.
727 *
728 * May be used as the dev_select() entry in ata_port_operations.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 *
730 * LOCKING:
731 * caller.
732 */
733
734void ata_std_dev_select (struct ata_port *ap, unsigned int device)
735{
736 u8 tmp;
737
738 if (device == 0)
739 tmp = ATA_DEVICE_OBS;
740 else
741 tmp = ATA_DEVICE_OBS | ATA_DEV1;
742
743 if (ap->flags & ATA_FLAG_MMIO) {
744 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
745 } else {
746 outb(tmp, ap->ioaddr.device_addr);
747 }
748 ata_pause(ap); /* needed; also flushes, for mmio */
749}
750
751/**
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
757 *
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
760 * ATA channel.
761 *
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
765 *
766 * LOCKING:
767 * caller.
768 */
769
770void ata_dev_select(struct ata_port *ap, unsigned int device,
771 unsigned int wait, unsigned int can_sleep)
772{
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap->id, device, wait);
775
776 if (wait)
777 ata_wait_idle(ap);
778
779 ap->ops->dev_select(ap, device);
780
781 if (wait) {
782 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
783 msleep(150);
784 ata_wait_idle(ap);
785 }
786}
787
788/**
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
Tejun Heo0bd33002006-02-12 22:47:05 +0900790 * @id: IDENTIFY DEVICE page to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 *
Tejun Heo0bd33002006-02-12 22:47:05 +0900792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
793 * page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 *
795 * LOCKING:
796 * caller.
797 */
798
Tejun Heo0bd33002006-02-12 22:47:05 +0900799static inline void ata_dump_id(const u16 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800{
801 DPRINTK("49==0x%04x "
802 "53==0x%04x "
803 "63==0x%04x "
804 "64==0x%04x "
805 "75==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900806 id[49],
807 id[53],
808 id[63],
809 id[64],
810 id[75]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 DPRINTK("80==0x%04x "
812 "81==0x%04x "
813 "82==0x%04x "
814 "83==0x%04x "
815 "84==0x%04x \n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900816 id[80],
817 id[81],
818 id[82],
819 id[83],
820 id[84]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 DPRINTK("88==0x%04x "
822 "93==0x%04x\n",
Tejun Heo0bd33002006-02-12 22:47:05 +0900823 id[88],
824 id[93]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825}
826
Tejun Heocb95d562006-03-06 04:31:56 +0900827/**
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
830 *
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
833 *
834 * FIXME: pre IDE drive timing (do we care ?).
835 *
836 * LOCKING:
837 * None.
838 *
839 * RETURNS:
840 * Computed xfermask
841 */
842static unsigned int ata_id_xfermask(const u16 *id)
843{
844 unsigned int pio_mask, mwdma_mask, udma_mask;
845
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
848 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
849 pio_mask <<= 3;
850 pio_mask |= 0x7;
851 } else {
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
854 * a mask.
855 */
856 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
857
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
863 */
864 }
865
866 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
Tejun Heofb21f0d2006-03-12 12:34:35 +0900867
868 udma_mask = 0;
869 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
870 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
Tejun Heocb95d562006-03-06 04:31:56 +0900871
872 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
873}
874
Tejun Heo86e45b62006-03-05 15:29:09 +0900875/**
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
Randy Dunlape2a7f772006-05-18 10:50:18 -0700878 * @fn: workqueue function to be scheduled
879 * @data: data value to pass to workqueue function
880 * @delay: delay time for workqueue function
Tejun Heo86e45b62006-03-05 15:29:09 +0900881 *
882 * Schedule @fn(@data) for execution after @delay jiffies using
883 * port_task. There is one port_task per port and it's the
884 * user(low level driver)'s responsibility to make sure that only
885 * one task is active at any given time.
886 *
887 * libata core layer takes care of synchronization between
888 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * synchronization.
890 *
891 * LOCKING:
892 * Inherited from caller.
893 */
894void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
895 unsigned long delay)
896{
897 int rc;
898
Tejun Heo2e755f62006-03-05 15:29:09 +0900899 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
Tejun Heo86e45b62006-03-05 15:29:09 +0900900 return;
901
902 PREPARE_WORK(&ap->port_task, fn, data);
903
904 if (!delay)
905 rc = queue_work(ata_wq, &ap->port_task);
906 else
907 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
908
909 /* rc == 0 means that another user is using port task */
910 WARN_ON(rc == 0);
911}
912
913/**
914 * ata_port_flush_task - Flush port_task
915 * @ap: The ata_port to flush port_task for
916 *
917 * After this function completes, port_task is guranteed not to
918 * be running or scheduled.
919 *
920 * LOCKING:
921 * Kernel thread context (may sleep)
922 */
923void ata_port_flush_task(struct ata_port *ap)
924{
925 unsigned long flags;
926
927 DPRINTK("ENTER\n");
928
929 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo2e755f62006-03-05 15:29:09 +0900930 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
Tejun Heo86e45b62006-03-05 15:29:09 +0900931 spin_unlock_irqrestore(&ap->host_set->lock, flags);
932
933 DPRINTK("flush #1\n");
934 flush_workqueue(ata_wq);
935
936 /*
937 * At this point, if a task is running, it's guaranteed to see
938 * the FLUSH flag; thus, it will never queue pio tasks again.
939 * Cancel and flush.
940 */
941 if (!cancel_delayed_work(&ap->port_task)) {
942 DPRINTK("flush #2\n");
943 flush_workqueue(ata_wq);
944 }
945
946 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo2e755f62006-03-05 15:29:09 +0900947 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
Tejun Heo86e45b62006-03-05 15:29:09 +0900948 spin_unlock_irqrestore(&ap->host_set->lock, flags);
949
950 DPRINTK("EXIT\n");
951}
952
Tejun Heo77853bf2006-01-23 13:09:36 +0900953void ata_qc_complete_internal(struct ata_queued_cmd *qc)
Tejun Heoa2a7a662005-12-13 14:48:31 +0900954{
Tejun Heo77853bf2006-01-23 13:09:36 +0900955 struct completion *waiting = qc->private_data;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900956
Tejun Heoa2a7a662005-12-13 14:48:31 +0900957 complete(waiting);
Tejun Heoa2a7a662005-12-13 14:48:31 +0900958}
959
960/**
961 * ata_exec_internal - execute libata internal command
Tejun Heoa2a7a662005-12-13 14:48:31 +0900962 * @dev: Device to which the command is sent
963 * @tf: Taskfile registers for the command and the result
Tejun Heod69cf372006-04-02 18:51:53 +0900964 * @cdb: CDB for packet command
Tejun Heoa2a7a662005-12-13 14:48:31 +0900965 * @dma_dir: Data tranfer direction of the command
966 * @buf: Data buffer of the command
967 * @buflen: Length of data buffer
968 *
969 * Executes libata internal command with timeout. @tf contains
970 * command on entry and result on return. Timeout and error
971 * conditions are reported via return value. No recovery action
972 * is taken after a command times out. It's caller's duty to
973 * clean up after timeout.
974 *
975 * LOCKING:
976 * None. Should be called with kernel context, might sleep.
977 */
978
Tejun Heo3373efd2006-05-15 20:57:53 +0900979unsigned ata_exec_internal(struct ata_device *dev,
Tejun Heo1ad8e7f2006-04-02 18:51:53 +0900980 struct ata_taskfile *tf, const u8 *cdb,
981 int dma_dir, void *buf, unsigned int buflen)
Tejun Heoa2a7a662005-12-13 14:48:31 +0900982{
Tejun Heo3373efd2006-05-15 20:57:53 +0900983 struct ata_port *ap = dev->ap;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900984 u8 command = tf->command;
985 struct ata_queued_cmd *qc;
Tejun Heo2ab7db12006-05-15 20:58:02 +0900986 unsigned int tag, preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +0900987 u32 preempted_sactive, preempted_qc_active;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900988 DECLARE_COMPLETION(wait);
989 unsigned long flags;
Tejun Heo77853bf2006-01-23 13:09:36 +0900990 unsigned int err_mask;
Tejun Heod95a7172006-05-15 20:58:14 +0900991 int rc;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900992
993 spin_lock_irqsave(&ap->host_set->lock, flags);
994
Tejun Heoe3180492006-05-15 20:58:09 +0900995 /* no internal command while frozen */
996 if (ap->flags & ATA_FLAG_FROZEN) {
997 spin_unlock_irqrestore(&ap->host_set->lock, flags);
998 return AC_ERR_SYSTEM;
999 }
1000
Tejun Heo2ab7db12006-05-15 20:58:02 +09001001 /* initialize internal qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001002
Tejun Heo2ab7db12006-05-15 20:58:02 +09001003 /* XXX: Tag 0 is used for drivers with legacy EH as some
1004 * drivers choke if any other tag is given. This breaks
1005 * ata_tag_internal() test for those drivers. Don't use new
1006 * EH stuff without converting to it.
1007 */
1008 if (ap->ops->error_handler)
1009 tag = ATA_TAG_INTERNAL;
1010 else
1011 tag = 0;
1012
Tejun Heo6cec4a32006-05-15 21:03:41 +09001013 if (test_and_set_bit(tag, &ap->qc_allocated))
Tejun Heo2ab7db12006-05-15 20:58:02 +09001014 BUG();
Tejun Heof69499f2006-05-15 20:58:03 +09001015 qc = __ata_qc_from_tag(ap, tag);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001016
1017 qc->tag = tag;
1018 qc->scsicmd = NULL;
1019 qc->ap = ap;
1020 qc->dev = dev;
1021 ata_qc_reinit(qc);
1022
1023 preempted_tag = ap->active_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001024 preempted_sactive = ap->sactive;
1025 preempted_qc_active = ap->qc_active;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001026 ap->active_tag = ATA_TAG_POISON;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001027 ap->sactive = 0;
1028 ap->qc_active = 0;
Tejun Heo2ab7db12006-05-15 20:58:02 +09001029
1030 /* prepare & issue qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001031 qc->tf = *tf;
Tejun Heod69cf372006-04-02 18:51:53 +09001032 if (cdb)
1033 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
Tejun Heoe61e0672006-05-15 20:57:40 +09001034 qc->flags |= ATA_QCFLAG_RESULT_TF;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001035 qc->dma_dir = dma_dir;
1036 if (dma_dir != DMA_NONE) {
1037 ata_sg_init_one(qc, buf, buflen);
1038 qc->nsect = buflen / ATA_SECT_SIZE;
1039 }
1040
Tejun Heo77853bf2006-01-23 13:09:36 +09001041 qc->private_data = &wait;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001042 qc->complete_fn = ata_qc_complete_internal;
1043
Tejun Heo8e0e6942006-03-31 20:41:11 +09001044 ata_qc_issue(qc);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001045
1046 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1047
Tejun Heod95a7172006-05-15 20:58:14 +09001048 rc = wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL);
Albert Lee41ade502006-03-14 11:19:04 +08001049
Tejun Heod95a7172006-05-15 20:58:14 +09001050 ata_port_flush_task(ap);
1051
1052 if (!rc) {
Tejun Heoa2a7a662005-12-13 14:48:31 +09001053 spin_lock_irqsave(&ap->host_set->lock, flags);
1054
1055 /* We're racing with irq here. If we lose, the
1056 * following test prevents us from completing the qc
Tejun Heod95a7172006-05-15 20:58:14 +09001057 * twice. If we win, the port is frozen and will be
1058 * cleaned up by ->post_internal_cmd().
Tejun Heoa2a7a662005-12-13 14:48:31 +09001059 */
Tejun Heo77853bf2006-01-23 13:09:36 +09001060 if (qc->flags & ATA_QCFLAG_ACTIVE) {
Tejun Heod95a7172006-05-15 20:58:14 +09001061 qc->err_mask |= AC_ERR_TIMEOUT;
1062
1063 if (ap->ops->error_handler)
1064 ata_port_freeze(ap);
1065 else
1066 ata_qc_complete(qc);
Tejun Heof15a1da2006-05-15 20:57:56 +09001067
1068 ata_dev_printk(dev, KERN_WARNING,
1069 "qc timeout (cmd 0x%x)\n", command);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001070 }
1071
1072 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1073 }
1074
Tejun Heod95a7172006-05-15 20:58:14 +09001075 /* do post_internal_cmd */
1076 if (ap->ops->post_internal_cmd)
1077 ap->ops->post_internal_cmd(qc);
1078
1079 if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
1080 ata_dev_printk(dev, KERN_WARNING, "zero err_mask for failed "
1081 "internal command, assuming AC_ERR_OTHER\n");
1082 qc->err_mask |= AC_ERR_OTHER;
1083 }
1084
Tejun Heo15869302006-05-15 20:57:33 +09001085 /* finish up */
1086 spin_lock_irqsave(&ap->host_set->lock, flags);
1087
Tejun Heoe61e0672006-05-15 20:57:40 +09001088 *tf = qc->result_tf;
Tejun Heo77853bf2006-01-23 13:09:36 +09001089 err_mask = qc->err_mask;
1090
1091 ata_qc_free(qc);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001092 ap->active_tag = preempted_tag;
Tejun Heodedaf2b2006-05-15 21:03:43 +09001093 ap->sactive = preempted_sactive;
1094 ap->qc_active = preempted_qc_active;
Tejun Heo77853bf2006-01-23 13:09:36 +09001095
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001096 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1097 * Until those drivers are fixed, we detect the condition
1098 * here, fail the command with AC_ERR_SYSTEM and reenable the
1099 * port.
1100 *
1101 * Note that this doesn't change any behavior as internal
1102 * command failure results in disabling the device in the
1103 * higher layer for LLDDs without new reset/EH callbacks.
1104 *
1105 * Kill the following code as soon as those drivers are fixed.
1106 */
Tejun Heo198e0fe2006-04-02 18:51:52 +09001107 if (ap->flags & ATA_FLAG_DISABLED) {
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001108 err_mask |= AC_ERR_SYSTEM;
1109 ata_port_probe(ap);
1110 }
1111
Tejun Heo15869302006-05-15 20:57:33 +09001112 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1113
Tejun Heo77853bf2006-01-23 13:09:36 +09001114 return err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001115}
1116
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117/**
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001118 * ata_pio_need_iordy - check if iordy needed
1119 * @adev: ATA device
1120 *
1121 * Check if the current speed of the device requires IORDY. Used
1122 * by various controllers for chip configuration.
1123 */
1124
1125unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1126{
1127 int pio;
1128 int speed = adev->pio_mode - XFER_PIO_0;
1129
1130 if (speed < 2)
1131 return 0;
1132 if (speed > 2)
1133 return 1;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001134
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001135 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1136
1137 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1138 pio = adev->id[ATA_ID_EIDE_PIO];
1139 /* Is the speed faster than the drive allows non IORDY ? */
1140 if (pio) {
1141 /* This is cycle times not frequency - watch the logic! */
1142 if (pio > 240) /* PIO2 is 240nS per cycle */
1143 return 1;
1144 return 0;
1145 }
1146 }
1147 return 0;
1148}
1149
1150/**
Tejun Heo49016ac2006-02-21 02:12:11 +09001151 * ata_dev_read_id - Read ID data from the specified device
Tejun Heo49016ac2006-02-21 02:12:11 +09001152 * @dev: target device
1153 * @p_class: pointer to class of the target device (may be changed)
1154 * @post_reset: is this read ID post-reset?
Tejun Heofe635c72006-05-15 20:57:35 +09001155 * @id: buffer to read IDENTIFY data into
Tejun Heo49016ac2006-02-21 02:12:11 +09001156 *
1157 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1158 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
Tejun Heoaec5c3c2006-03-25 01:33:34 +09001159 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1160 * for pre-ATA4 drives.
Tejun Heo49016ac2006-02-21 02:12:11 +09001161 *
1162 * LOCKING:
1163 * Kernel thread context (may sleep)
1164 *
1165 * RETURNS:
1166 * 0 on success, -errno otherwise.
1167 */
Tejun Heo3373efd2006-05-15 20:57:53 +09001168static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1169 int post_reset, u16 *id)
Tejun Heo49016ac2006-02-21 02:12:11 +09001170{
Tejun Heo3373efd2006-05-15 20:57:53 +09001171 struct ata_port *ap = dev->ap;
Tejun Heo49016ac2006-02-21 02:12:11 +09001172 unsigned int class = *p_class;
Tejun Heo49016ac2006-02-21 02:12:11 +09001173 struct ata_taskfile tf;
1174 unsigned int err_mask = 0;
1175 const char *reason;
1176 int rc;
1177
1178 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1179
Tejun Heo49016ac2006-02-21 02:12:11 +09001180 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1181
1182 retry:
Tejun Heo3373efd2006-05-15 20:57:53 +09001183 ata_tf_init(dev, &tf);
Tejun Heo49016ac2006-02-21 02:12:11 +09001184
1185 switch (class) {
1186 case ATA_DEV_ATA:
1187 tf.command = ATA_CMD_ID_ATA;
1188 break;
1189 case ATA_DEV_ATAPI:
1190 tf.command = ATA_CMD_ID_ATAPI;
1191 break;
1192 default:
1193 rc = -ENODEV;
1194 reason = "unsupported class";
1195 goto err_out;
1196 }
1197
1198 tf.protocol = ATA_PROT_PIO;
1199
Tejun Heo3373efd2006-05-15 20:57:53 +09001200 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo49016ac2006-02-21 02:12:11 +09001201 id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo49016ac2006-02-21 02:12:11 +09001202 if (err_mask) {
1203 rc = -EIO;
1204 reason = "I/O error";
Tejun Heo49016ac2006-02-21 02:12:11 +09001205 goto err_out;
1206 }
1207
1208 swap_buf_le16(id, ATA_ID_WORDS);
1209
Tejun Heo49016ac2006-02-21 02:12:11 +09001210 /* sanity check */
Alan Cox692785e2006-03-27 18:49:19 +01001211 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
Tejun Heo49016ac2006-02-21 02:12:11 +09001212 rc = -EINVAL;
1213 reason = "device reports illegal type";
1214 goto err_out;
1215 }
1216
1217 if (post_reset && class == ATA_DEV_ATA) {
1218 /*
1219 * The exact sequence expected by certain pre-ATA4 drives is:
1220 * SRST RESET
1221 * IDENTIFY
1222 * INITIALIZE DEVICE PARAMETERS
1223 * anything else..
1224 * Some drives were very specific about that exact sequence.
1225 */
1226 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001227 err_mask = ata_dev_init_params(dev, id[3], id[6]);
Tejun Heo49016ac2006-02-21 02:12:11 +09001228 if (err_mask) {
1229 rc = -EIO;
1230 reason = "INIT_DEV_PARAMS failed";
1231 goto err_out;
1232 }
1233
1234 /* current CHS translation info (id[53-58]) might be
1235 * changed. reread the identify device info.
1236 */
1237 post_reset = 0;
1238 goto retry;
1239 }
1240 }
1241
1242 *p_class = class;
Tejun Heofe635c72006-05-15 20:57:35 +09001243
Tejun Heo49016ac2006-02-21 02:12:11 +09001244 return 0;
1245
1246 err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09001247 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1248 "(%s, err_mask=0x%x)\n", reason, err_mask);
Tejun Heo49016ac2006-02-21 02:12:11 +09001249 return rc;
1250}
1251
Tejun Heo3373efd2006-05-15 20:57:53 +09001252static inline u8 ata_dev_knobble(struct ata_device *dev)
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001253{
Tejun Heo3373efd2006-05-15 20:57:53 +09001254 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001255}
1256
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001257static void ata_dev_config_ncq(struct ata_device *dev,
1258 char *desc, size_t desc_sz)
1259{
1260 struct ata_port *ap = dev->ap;
1261 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1262
1263 if (!ata_id_has_ncq(dev->id)) {
1264 desc[0] = '\0';
1265 return;
1266 }
1267
1268 if (ap->flags & ATA_FLAG_NCQ) {
1269 hdepth = min(ap->host->can_queue, ATA_MAX_QUEUE - 1);
1270 dev->flags |= ATA_DFLAG_NCQ;
1271 }
1272
1273 if (hdepth >= ddepth)
1274 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1275 else
1276 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1277}
1278
Tejun Heo49016ac2006-02-21 02:12:11 +09001279/**
Tejun Heoffeae412006-03-01 16:09:35 +09001280 * ata_dev_configure - Configure the specified ATA/ATAPI device
Tejun Heoffeae412006-03-01 16:09:35 +09001281 * @dev: Target device to configure
Tejun Heo4c2d7212006-03-05 17:55:58 +09001282 * @print_info: Enable device info printout
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 *
Tejun Heoffeae412006-03-01 16:09:35 +09001284 * Configure @dev according to @dev->id. Generic and low-level
1285 * driver specific fixups are also applied.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 *
1287 * LOCKING:
Tejun Heoffeae412006-03-01 16:09:35 +09001288 * Kernel thread context (may sleep)
1289 *
1290 * RETURNS:
1291 * 0 on success, -errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 */
Tejun Heo3373efd2006-05-15 20:57:53 +09001293static int ata_dev_configure(struct ata_device *dev, int print_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294{
Tejun Heo3373efd2006-05-15 20:57:53 +09001295 struct ata_port *ap = dev->ap;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001296 const u16 *id = dev->id;
Tejun Heoff8854b2006-03-06 04:31:56 +09001297 unsigned int xfer_mask;
Tejun Heo6e7846e2006-02-12 23:32:58 +09001298 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
Tejun Heoe1211e32006-04-01 01:38:18 +09001300 if (!ata_dev_enabled(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
Tejun Heoffeae412006-03-01 16:09:35 +09001302 ap->id, dev->devno);
1303 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 }
1305
Tejun Heoffeae412006-03-01 16:09:35 +09001306 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001308 /* print device capabilities */
1309 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001310 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1311 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1312 id[49], id[82], id[83], id[84],
1313 id[85], id[86], id[87], id[88]);
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001314
Tejun Heo208a9932006-03-05 17:55:58 +09001315 /* initialize to-be-configured parameters */
Tejun Heoea1dd4e2006-04-02 18:51:53 +09001316 dev->flags &= ~ATA_DFLAG_CFG_MASK;
Tejun Heo208a9932006-03-05 17:55:58 +09001317 dev->max_sectors = 0;
1318 dev->cdb_len = 0;
1319 dev->n_sectors = 0;
1320 dev->cylinders = 0;
1321 dev->heads = 0;
1322 dev->sectors = 0;
1323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 /*
1325 * common ATA, ATAPI feature tests
1326 */
1327
Tejun Heoff8854b2006-03-06 04:31:56 +09001328 /* find max transfer mode; for printk only */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001329 xfer_mask = ata_id_xfermask(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
Tejun Heo1148c3a2006-03-13 19:48:04 +09001331 ata_dump_id(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
1333 /* ATA-specific feature tests */
1334 if (dev->class == ATA_DEV_ATA) {
Tejun Heo1148c3a2006-03-13 19:48:04 +09001335 dev->n_sectors = ata_id_n_sectors(id);
Tejun Heo29407402006-02-12 22:47:04 +09001336
Tejun Heo1148c3a2006-03-13 19:48:04 +09001337 if (ata_id_has_lba(id)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001338 const char *lba_desc;
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001339 char ncq_desc[20];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001340
Tejun Heo4c2d7212006-03-05 17:55:58 +09001341 lba_desc = "LBA";
1342 dev->flags |= ATA_DFLAG_LBA;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001343 if (ata_id_has_lba48(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001344 dev->flags |= ATA_DFLAG_LBA48;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001345 lba_desc = "LBA48";
1346 }
Albert Lee8bf62ece2005-05-12 15:29:42 -04001347
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001348 /* config NCQ */
1349 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1350
Albert Lee8bf62ece2005-05-12 15:29:42 -04001351 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001352 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001353 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001354 "max %s, %Lu sectors: %s %s\n",
Tejun Heof15a1da2006-05-15 20:57:56 +09001355 ata_id_major_version(id),
1356 ata_mode_string(xfer_mask),
1357 (unsigned long long)dev->n_sectors,
Tejun Heoa6e6ce82006-05-15 21:03:48 +09001358 lba_desc, ncq_desc);
Tejun Heoffeae412006-03-01 16:09:35 +09001359 } else {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001360 /* CHS */
1361
1362 /* Default translation */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001363 dev->cylinders = id[1];
1364 dev->heads = id[3];
1365 dev->sectors = id[6];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001366
Tejun Heo1148c3a2006-03-13 19:48:04 +09001367 if (ata_id_current_chs_valid(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001368 /* Current CHS translation is valid. */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001369 dev->cylinders = id[54];
1370 dev->heads = id[55];
1371 dev->sectors = id[56];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001372 }
1373
1374 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001375 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001376 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1377 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1378 ata_id_major_version(id),
1379 ata_mode_string(xfer_mask),
1380 (unsigned long long)dev->n_sectors,
1381 dev->cylinders, dev->heads, dev->sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 }
1383
Albert Lee07f6f7d2005-11-01 19:33:20 +08001384 if (dev->id[59] & 0x100) {
1385 dev->multi_count = dev->id[59] & 0xff;
1386 DPRINTK("ata%u: dev %u multi count %u\n",
Albert Lee999bb6f2006-03-25 18:07:48 +08001387 ap->id, dev->devno, dev->multi_count);
Albert Lee07f6f7d2005-11-01 19:33:20 +08001388 }
1389
Tejun Heo6e7846e2006-02-12 23:32:58 +09001390 dev->cdb_len = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 }
1392
1393 /* ATAPI-specific feature tests */
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05001394 else if (dev->class == ATA_DEV_ATAPI) {
Albert Lee08a556d2006-03-31 13:29:04 +08001395 char *cdb_intr_string = "";
1396
Tejun Heo1148c3a2006-03-13 19:48:04 +09001397 rc = atapi_cdb_len(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09001399 ata_dev_printk(dev, KERN_WARNING,
1400 "unsupported CDB len\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001401 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 goto err_out_nosup;
1403 }
Tejun Heo6e7846e2006-02-12 23:32:58 +09001404 dev->cdb_len = (unsigned int) rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Albert Lee08a556d2006-03-31 13:29:04 +08001406 if (ata_id_cdb_intr(dev->id)) {
Albert Lee312f7da2005-09-27 17:38:03 +08001407 dev->flags |= ATA_DFLAG_CDB_INTR;
Albert Lee08a556d2006-03-31 13:29:04 +08001408 cdb_intr_string = ", CDB intr";
1409 }
Albert Lee312f7da2005-09-27 17:38:03 +08001410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001412 if (print_info)
Tejun Heo12436c32006-05-15 20:59:15 +09001413 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
1414 ata_mode_string(xfer_mask),
1415 cdb_intr_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 }
1417
Tejun Heo6e7846e2006-02-12 23:32:58 +09001418 ap->host->max_cmd_len = 0;
1419 for (i = 0; i < ATA_MAX_DEVICES; i++)
1420 ap->host->max_cmd_len = max_t(unsigned int,
1421 ap->host->max_cmd_len,
1422 ap->device[i].cdb_len);
1423
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001424 /* limit bridge transfers to udma5, 200 sectors */
Tejun Heo3373efd2006-05-15 20:57:53 +09001425 if (ata_dev_knobble(dev)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001426 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001427 ata_dev_printk(dev, KERN_INFO,
1428 "applying bridge limits\n");
Tejun Heo5a529132006-03-24 14:07:50 +09001429 dev->udma_mask &= ATA_UDMA5;
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001430 dev->max_sectors = ATA_MAX_SECTORS;
1431 }
1432
1433 if (ap->ops->dev_config)
1434 ap->ops->dev_config(ap, dev);
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
Tejun Heoffeae412006-03-01 16:09:35 +09001437 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438
1439err_out_nosup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 DPRINTK("EXIT, err\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001441 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442}
1443
1444/**
1445 * ata_bus_probe - Reset and probe ATA bus
1446 * @ap: Bus to probe
1447 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001448 * Master ATA bus probing function. Initiates a hardware-dependent
1449 * bus reset, then attempts to identify any devices found on
1450 * the bus.
1451 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001453 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 *
1455 * RETURNS:
Tejun Heo96072e62006-04-01 01:38:17 +09001456 * Zero on success, negative errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 */
1458
1459static int ata_bus_probe(struct ata_port *ap)
1460{
Tejun Heo28ca5c52006-03-01 16:09:36 +09001461 unsigned int classes[ATA_MAX_DEVICES];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001462 int tries[ATA_MAX_DEVICES];
1463 int i, rc, down_xfermask;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001464 struct ata_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
Tejun Heo28ca5c52006-03-01 16:09:36 +09001466 ata_port_probe(ap);
1467
Tejun Heo14d2bac2006-04-02 17:54:46 +09001468 for (i = 0; i < ATA_MAX_DEVICES; i++)
1469 tries[i] = ATA_PROBE_MAX_TRIES;
1470
1471 retry:
1472 down_xfermask = 0;
1473
Tejun Heo20444702006-03-13 01:57:01 +09001474 /* reset and determine device classes */
1475 for (i = 0; i < ATA_MAX_DEVICES; i++)
1476 classes[i] = ATA_DEV_UNKNOWN;
Tejun Heo2061a472006-03-12 00:57:39 +09001477
Tejun Heo20444702006-03-13 01:57:01 +09001478 if (ap->ops->probe_reset) {
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001479 rc = ap->ops->probe_reset(ap, classes);
Tejun Heo28ca5c52006-03-01 16:09:36 +09001480 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09001481 ata_port_printk(ap, KERN_ERR,
1482 "reset failed (errno=%d)\n", rc);
Tejun Heo28ca5c52006-03-01 16:09:36 +09001483 return rc;
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001484 }
Tejun Heo28ca5c52006-03-01 16:09:36 +09001485 } else {
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001486 ap->ops->phy_reset(ap);
1487
Tejun Heof8c2c422006-05-15 20:57:30 +09001488 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1489 if (!(ap->flags & ATA_FLAG_DISABLED))
Tejun Heo28ca5c52006-03-01 16:09:36 +09001490 classes[i] = ap->device[i].class;
Tejun Heof8c2c422006-05-15 20:57:30 +09001491 ap->device[i].class = ATA_DEV_UNKNOWN;
1492 }
Tejun Heo20444702006-03-13 01:57:01 +09001493
Tejun Heo28ca5c52006-03-01 16:09:36 +09001494 ata_port_probe(ap);
1495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
Tejun Heo20444702006-03-13 01:57:01 +09001497 for (i = 0; i < ATA_MAX_DEVICES; i++)
1498 if (classes[i] == ATA_DEV_UNKNOWN)
1499 classes[i] = ATA_DEV_NONE;
1500
Alan Coxb6079ca2006-05-22 16:52:06 +01001501 /* after the reset the device state is PIO 0 and the controller
1502 state is undefined. Record the mode */
1503
1504 for (i = 0; i < ATA_MAX_DEVICES; i++)
1505 ap->device[i].pio_mode = XFER_PIO_0;
1506
Tejun Heo28ca5c52006-03-01 16:09:36 +09001507 /* read IDENTIFY page and configure devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001509 dev = &ap->device[i];
Tejun Heo28ca5c52006-03-01 16:09:36 +09001510
Tejun Heoec573752006-04-11 22:26:29 +09001511 if (tries[i])
1512 dev->class = classes[i];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001513
Tejun Heoe1211e32006-04-01 01:38:18 +09001514 if (!ata_dev_enabled(dev))
Tejun Heoffeae412006-03-01 16:09:35 +09001515 continue;
1516
Tejun Heo3373efd2006-05-15 20:57:53 +09001517 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001518 if (rc)
1519 goto fail;
Tejun Heoffeae412006-03-01 16:09:35 +09001520
Tejun Heo3373efd2006-05-15 20:57:53 +09001521 rc = ata_dev_configure(dev, 1);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001522 if (rc)
1523 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 }
1525
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001526 /* configure transfer mode */
Tejun Heo3adcebb2006-05-15 20:57:37 +09001527 rc = ata_set_mode(ap, &dev);
Tejun Heo51713d32006-04-11 22:26:29 +09001528 if (rc) {
1529 down_xfermask = 1;
1530 goto fail;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001531 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001533 for (i = 0; i < ATA_MAX_DEVICES; i++)
1534 if (ata_dev_enabled(&ap->device[i]))
1535 return 0;
Alan Coxe35a9e02006-03-27 18:46:37 +01001536
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001537 /* no device present, disable port */
1538 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 ap->ops->port_disable(ap);
Tejun Heo96072e62006-04-01 01:38:17 +09001540 return -ENODEV;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001541
1542 fail:
1543 switch (rc) {
1544 case -EINVAL:
1545 case -ENODEV:
1546 tries[dev->devno] = 0;
1547 break;
1548 case -EIO:
Tejun Heo3c567b72006-05-15 20:57:23 +09001549 sata_down_spd_limit(ap);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001550 /* fall through */
1551 default:
1552 tries[dev->devno]--;
1553 if (down_xfermask &&
Tejun Heo3373efd2006-05-15 20:57:53 +09001554 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
Tejun Heo14d2bac2006-04-02 17:54:46 +09001555 tries[dev->devno] = 0;
1556 }
1557
Tejun Heoec573752006-04-11 22:26:29 +09001558 if (!tries[dev->devno]) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001559 ata_down_xfermask_limit(dev, 1);
1560 ata_dev_disable(dev);
Tejun Heoec573752006-04-11 22:26:29 +09001561 }
1562
Tejun Heo14d2bac2006-04-02 17:54:46 +09001563 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564}
1565
1566/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001567 * ata_port_probe - Mark port as enabled
1568 * @ap: Port for which we indicate enablement
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001570 * Modify @ap data structure such that the system
1571 * thinks that the entire port is enabled.
1572 *
1573 * LOCKING: host_set lock, or some other form of
1574 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 */
1576
1577void ata_port_probe(struct ata_port *ap)
1578{
Tejun Heo198e0fe2006-04-02 18:51:52 +09001579 ap->flags &= ~ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580}
1581
1582/**
Tejun Heo3be680b2005-12-19 22:35:02 +09001583 * sata_print_link_status - Print SATA link status
1584 * @ap: SATA port to printk link status about
1585 *
1586 * This function prints link speed and status of a SATA link.
1587 *
1588 * LOCKING:
1589 * None.
1590 */
1591static void sata_print_link_status(struct ata_port *ap)
1592{
Tejun Heo6d5f9732006-04-03 00:09:41 +09001593 u32 sstatus, scontrol, tmp;
Tejun Heo3be680b2005-12-19 22:35:02 +09001594
Tejun Heo81952c52006-05-15 20:57:47 +09001595 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
Tejun Heo3be680b2005-12-19 22:35:02 +09001596 return;
Tejun Heo81952c52006-05-15 20:57:47 +09001597 sata_scr_read(ap, SCR_CONTROL, &scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001598
Tejun Heo81952c52006-05-15 20:57:47 +09001599 if (ata_port_online(ap)) {
Tejun Heo3be680b2005-12-19 22:35:02 +09001600 tmp = (sstatus >> 4) & 0xf;
Tejun Heof15a1da2006-05-15 20:57:56 +09001601 ata_port_printk(ap, KERN_INFO,
1602 "SATA link up %s (SStatus %X SControl %X)\n",
1603 sata_spd_string(tmp), sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001604 } else {
Tejun Heof15a1da2006-05-15 20:57:56 +09001605 ata_port_printk(ap, KERN_INFO,
1606 "SATA link down (SStatus %X SControl %X)\n",
1607 sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001608 }
1609}
1610
1611/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001612 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1613 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001615 * This function issues commands to standard SATA Sxxx
1616 * PHY registers, to wake up the phy (and device), and
1617 * clear any reset condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 *
1619 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001620 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 *
1622 */
1623void __sata_phy_reset(struct ata_port *ap)
1624{
1625 u32 sstatus;
1626 unsigned long timeout = jiffies + (HZ * 5);
1627
1628 if (ap->flags & ATA_FLAG_SATA_RESET) {
Brett Russcdcca89e2005-03-28 15:10:27 -05001629 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09001630 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
Tejun Heo62ba2842005-06-26 23:27:19 +09001631 /* Couldn't find anything in SATA I/II specs, but
1632 * AHCI-1.1 10.4.2 says at least 1 ms. */
1633 mdelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 }
Tejun Heo81952c52006-05-15 20:57:47 +09001635 /* phy wake/clear reset */
1636 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637
1638 /* wait for phy to become ready, if necessary */
1639 do {
1640 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09001641 sata_scr_read(ap, SCR_STATUS, &sstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 if ((sstatus & 0xf) != 1)
1643 break;
1644 } while (time_before(jiffies, timeout));
1645
Tejun Heo3be680b2005-12-19 22:35:02 +09001646 /* print link status */
1647 sata_print_link_status(ap);
Jeff Garzik656563e2005-11-20 03:36:45 -05001648
Tejun Heo3be680b2005-12-19 22:35:02 +09001649 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09001650 if (!ata_port_offline(ap))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 ata_port_probe(ap);
Tejun Heo3be680b2005-12-19 22:35:02 +09001652 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654
Tejun Heo198e0fe2006-04-02 18:51:52 +09001655 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 return;
1657
1658 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1659 ata_port_disable(ap);
1660 return;
1661 }
1662
1663 ap->cbl = ATA_CBL_SATA;
1664}
1665
1666/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001667 * sata_phy_reset - Reset SATA bus.
1668 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001670 * This function resets the SATA bus, and then probes
1671 * the bus for devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 *
1673 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001674 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 *
1676 */
1677void sata_phy_reset(struct ata_port *ap)
1678{
1679 __sata_phy_reset(ap);
Tejun Heo198e0fe2006-04-02 18:51:52 +09001680 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 return;
1682 ata_bus_reset(ap);
1683}
1684
1685/**
Alan Coxebdfca62006-03-23 15:38:34 +00001686 * ata_dev_pair - return other device on cable
Alan Coxebdfca62006-03-23 15:38:34 +00001687 * @adev: device
1688 *
1689 * Obtain the other device on the same cable, or if none is
1690 * present NULL is returned
1691 */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001692
Tejun Heo3373efd2006-05-15 20:57:53 +09001693struct ata_device *ata_dev_pair(struct ata_device *adev)
Alan Coxebdfca62006-03-23 15:38:34 +00001694{
Tejun Heo3373efd2006-05-15 20:57:53 +09001695 struct ata_port *ap = adev->ap;
Alan Coxebdfca62006-03-23 15:38:34 +00001696 struct ata_device *pair = &ap->device[1 - adev->devno];
Tejun Heoe1211e32006-04-01 01:38:18 +09001697 if (!ata_dev_enabled(pair))
Alan Coxebdfca62006-03-23 15:38:34 +00001698 return NULL;
1699 return pair;
1700}
1701
1702/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001703 * ata_port_disable - Disable port.
1704 * @ap: Port to be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001706 * Modify @ap data structure such that the system
1707 * thinks that the entire port is disabled, and should
1708 * never attempt to probe or communicate with devices
1709 * on this port.
1710 *
1711 * LOCKING: host_set lock, or some other form of
1712 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 */
1714
1715void ata_port_disable(struct ata_port *ap)
1716{
1717 ap->device[0].class = ATA_DEV_NONE;
1718 ap->device[1].class = ATA_DEV_NONE;
Tejun Heo198e0fe2006-04-02 18:51:52 +09001719 ap->flags |= ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720}
1721
Tejun Heo1c3fae42006-04-02 20:53:28 +09001722/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001723 * sata_down_spd_limit - adjust SATA spd limit downward
Tejun Heo1c3fae42006-04-02 20:53:28 +09001724 * @ap: Port to adjust SATA spd limit for
1725 *
1726 * Adjust SATA spd limit of @ap downward. Note that this
1727 * function only adjusts the limit. The change must be applied
Tejun Heo3c567b72006-05-15 20:57:23 +09001728 * using sata_set_spd().
Tejun Heo1c3fae42006-04-02 20:53:28 +09001729 *
1730 * LOCKING:
1731 * Inherited from caller.
1732 *
1733 * RETURNS:
1734 * 0 on success, negative errno on failure
1735 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001736int sata_down_spd_limit(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001737{
Tejun Heo81952c52006-05-15 20:57:47 +09001738 u32 sstatus, spd, mask;
1739 int rc, highbit;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001740
Tejun Heo81952c52006-05-15 20:57:47 +09001741 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1742 if (rc)
1743 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001744
1745 mask = ap->sata_spd_limit;
1746 if (mask <= 1)
1747 return -EINVAL;
1748 highbit = fls(mask) - 1;
1749 mask &= ~(1 << highbit);
1750
Tejun Heo81952c52006-05-15 20:57:47 +09001751 spd = (sstatus >> 4) & 0xf;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001752 if (spd <= 1)
1753 return -EINVAL;
1754 spd--;
1755 mask &= (1 << spd) - 1;
1756 if (!mask)
1757 return -EINVAL;
1758
1759 ap->sata_spd_limit = mask;
1760
Tejun Heof15a1da2006-05-15 20:57:56 +09001761 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1762 sata_spd_string(fls(mask)));
Tejun Heo1c3fae42006-04-02 20:53:28 +09001763
1764 return 0;
1765}
1766
Tejun Heo3c567b72006-05-15 20:57:23 +09001767static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001768{
1769 u32 spd, limit;
1770
1771 if (ap->sata_spd_limit == UINT_MAX)
1772 limit = 0;
1773 else
1774 limit = fls(ap->sata_spd_limit);
1775
1776 spd = (*scontrol >> 4) & 0xf;
1777 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1778
1779 return spd != limit;
1780}
1781
1782/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001783 * sata_set_spd_needed - is SATA spd configuration needed
Tejun Heo1c3fae42006-04-02 20:53:28 +09001784 * @ap: Port in question
1785 *
1786 * Test whether the spd limit in SControl matches
1787 * @ap->sata_spd_limit. This function is used to determine
1788 * whether hardreset is necessary to apply SATA spd
1789 * configuration.
1790 *
1791 * LOCKING:
1792 * Inherited from caller.
1793 *
1794 * RETURNS:
1795 * 1 if SATA spd configuration is needed, 0 otherwise.
1796 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001797int sata_set_spd_needed(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001798{
1799 u32 scontrol;
1800
Tejun Heo81952c52006-05-15 20:57:47 +09001801 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09001802 return 0;
1803
Tejun Heo3c567b72006-05-15 20:57:23 +09001804 return __sata_set_spd_needed(ap, &scontrol);
Tejun Heo1c3fae42006-04-02 20:53:28 +09001805}
1806
1807/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001808 * sata_set_spd - set SATA spd according to spd limit
Tejun Heo1c3fae42006-04-02 20:53:28 +09001809 * @ap: Port to set SATA spd for
1810 *
1811 * Set SATA spd of @ap according to sata_spd_limit.
1812 *
1813 * LOCKING:
1814 * Inherited from caller.
1815 *
1816 * RETURNS:
1817 * 0 if spd doesn't need to be changed, 1 if spd has been
Tejun Heo81952c52006-05-15 20:57:47 +09001818 * changed. Negative errno if SCR registers are inaccessible.
Tejun Heo1c3fae42006-04-02 20:53:28 +09001819 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001820int sata_set_spd(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001821{
1822 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09001823 int rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001824
Tejun Heo81952c52006-05-15 20:57:47 +09001825 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1826 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001827
Tejun Heo3c567b72006-05-15 20:57:23 +09001828 if (!__sata_set_spd_needed(ap, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09001829 return 0;
1830
Tejun Heo81952c52006-05-15 20:57:47 +09001831 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1832 return rc;
1833
Tejun Heo1c3fae42006-04-02 20:53:28 +09001834 return 1;
1835}
1836
Alan Cox452503f2005-10-21 19:01:32 -04001837/*
1838 * This mode timing computation functionality is ported over from
1839 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1840 */
1841/*
1842 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1843 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1844 * for PIO 5, which is a nonstandard extension and UDMA6, which
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001845 * is currently supported only by Maxtor drives.
Alan Cox452503f2005-10-21 19:01:32 -04001846 */
1847
1848static const struct ata_timing ata_timing[] = {
1849
1850 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1851 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1852 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1853 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1854
1855 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1856 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1857 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1858
1859/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001860
Alan Cox452503f2005-10-21 19:01:32 -04001861 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1862 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1863 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001864
Alan Cox452503f2005-10-21 19:01:32 -04001865 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1866 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1867 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1868
1869/* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1870 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1871 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1872
1873 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1874 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1875 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1876
1877/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1878
1879 { 0xFF }
1880};
1881
1882#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1883#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1884
1885static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1886{
1887 q->setup = EZ(t->setup * 1000, T);
1888 q->act8b = EZ(t->act8b * 1000, T);
1889 q->rec8b = EZ(t->rec8b * 1000, T);
1890 q->cyc8b = EZ(t->cyc8b * 1000, T);
1891 q->active = EZ(t->active * 1000, T);
1892 q->recover = EZ(t->recover * 1000, T);
1893 q->cycle = EZ(t->cycle * 1000, T);
1894 q->udma = EZ(t->udma * 1000, UT);
1895}
1896
1897void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1898 struct ata_timing *m, unsigned int what)
1899{
1900 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1901 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1902 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1903 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1904 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1905 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1906 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1907 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1908}
1909
1910static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1911{
1912 const struct ata_timing *t;
1913
1914 for (t = ata_timing; t->mode != speed; t++)
Alan Cox91190752005-10-26 12:17:46 -04001915 if (t->mode == 0xFF)
Alan Cox452503f2005-10-21 19:01:32 -04001916 return NULL;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001917 return t;
Alan Cox452503f2005-10-21 19:01:32 -04001918}
1919
1920int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1921 struct ata_timing *t, int T, int UT)
1922{
1923 const struct ata_timing *s;
1924 struct ata_timing p;
1925
1926 /*
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001927 * Find the mode.
Albert Lee75b1f2f2005-11-16 17:06:18 +08001928 */
Alan Cox452503f2005-10-21 19:01:32 -04001929
1930 if (!(s = ata_timing_find_mode(speed)))
1931 return -EINVAL;
1932
Albert Lee75b1f2f2005-11-16 17:06:18 +08001933 memcpy(t, s, sizeof(*s));
1934
Alan Cox452503f2005-10-21 19:01:32 -04001935 /*
1936 * If the drive is an EIDE drive, it can tell us it needs extended
1937 * PIO/MW_DMA cycle timing.
1938 */
1939
1940 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1941 memset(&p, 0, sizeof(p));
1942 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1943 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1944 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1945 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1946 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1947 }
1948 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1949 }
1950
1951 /*
1952 * Convert the timing to bus clock counts.
1953 */
1954
Albert Lee75b1f2f2005-11-16 17:06:18 +08001955 ata_timing_quantize(t, t, T, UT);
Alan Cox452503f2005-10-21 19:01:32 -04001956
1957 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001958 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1959 * S.M.A.R.T * and some other commands. We have to ensure that the
1960 * DMA cycle timing is slower/equal than the fastest PIO timing.
Alan Cox452503f2005-10-21 19:01:32 -04001961 */
1962
1963 if (speed > XFER_PIO_4) {
1964 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1965 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1966 }
1967
1968 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001969 * Lengthen active & recovery time so that cycle time is correct.
Alan Cox452503f2005-10-21 19:01:32 -04001970 */
1971
1972 if (t->act8b + t->rec8b < t->cyc8b) {
1973 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1974 t->rec8b = t->cyc8b - t->act8b;
1975 }
1976
1977 if (t->active + t->recover < t->cycle) {
1978 t->active += (t->cycle - (t->active + t->recover)) / 2;
1979 t->recover = t->cycle - t->active;
1980 }
1981
1982 return 0;
1983}
1984
Tejun Heocf176e12006-04-02 17:54:46 +09001985/**
1986 * ata_down_xfermask_limit - adjust dev xfer masks downward
Tejun Heocf176e12006-04-02 17:54:46 +09001987 * @dev: Device to adjust xfer masks
1988 * @force_pio0: Force PIO0
1989 *
1990 * Adjust xfer masks of @dev downward. Note that this function
1991 * does not apply the change. Invoking ata_set_mode() afterwards
1992 * will apply the limit.
1993 *
1994 * LOCKING:
1995 * Inherited from caller.
1996 *
1997 * RETURNS:
1998 * 0 on success, negative errno on failure
1999 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002000int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
Tejun Heocf176e12006-04-02 17:54:46 +09002001{
2002 unsigned long xfer_mask;
2003 int highbit;
2004
2005 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
2006 dev->udma_mask);
2007
2008 if (!xfer_mask)
2009 goto fail;
2010 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2011 if (xfer_mask & ATA_MASK_UDMA)
2012 xfer_mask &= ~ATA_MASK_MWDMA;
2013
2014 highbit = fls(xfer_mask) - 1;
2015 xfer_mask &= ~(1 << highbit);
2016 if (force_pio0)
2017 xfer_mask &= 1 << ATA_SHIFT_PIO;
2018 if (!xfer_mask)
2019 goto fail;
2020
2021 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2022 &dev->udma_mask);
2023
Tejun Heof15a1da2006-05-15 20:57:56 +09002024 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
2025 ata_mode_string(xfer_mask));
Tejun Heocf176e12006-04-02 17:54:46 +09002026
2027 return 0;
2028
2029 fail:
2030 return -EINVAL;
2031}
2032
Tejun Heo3373efd2006-05-15 20:57:53 +09002033static int ata_dev_set_mode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034{
Tejun Heo83206a22006-03-24 15:25:31 +09002035 unsigned int err_mask;
2036 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
Tejun Heoe8384602006-04-02 18:51:53 +09002038 dev->flags &= ~ATA_DFLAG_PIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 if (dev->xfer_shift == ATA_SHIFT_PIO)
2040 dev->flags |= ATA_DFLAG_PIO;
2041
Tejun Heo3373efd2006-05-15 20:57:53 +09002042 err_mask = ata_dev_set_xfermode(dev);
Tejun Heo83206a22006-03-24 15:25:31 +09002043 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002044 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2045 "(err_mask=0x%x)\n", err_mask);
Tejun Heo83206a22006-03-24 15:25:31 +09002046 return -EIO;
2047 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048
Tejun Heo3373efd2006-05-15 20:57:53 +09002049 rc = ata_dev_revalidate(dev, 0);
Tejun Heo5eb45c02006-04-02 18:51:52 +09002050 if (rc)
Tejun Heo83206a22006-03-24 15:25:31 +09002051 return rc;
Tejun Heo48a8a142006-03-05 17:55:58 +09002052
Tejun Heo23e71c32006-03-06 04:31:57 +09002053 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2054 dev->xfer_shift, (int)dev->xfer_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055
Tejun Heof15a1da2006-05-15 20:57:56 +09002056 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2057 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
Tejun Heo83206a22006-03-24 15:25:31 +09002058 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059}
2060
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061/**
2062 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2063 * @ap: port on which timings will be programmed
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002064 * @r_failed_dev: out paramter for failed device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065 *
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002066 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2067 * ata_set_mode() fails, pointer to the failing device is
2068 * returned in @r_failed_dev.
Jeff Garzik780a87f2005-05-30 15:41:05 -04002069 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002071 * PCI/etc. bus probe sem.
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002072 *
2073 * RETURNS:
2074 * 0 on success, negative errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 */
Tejun Heo1ad8e7f2006-04-02 18:51:53 +09002076int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077{
Tejun Heoe8e06192006-04-01 01:38:18 +09002078 struct ata_device *dev;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002079 int i, rc = 0, used_dma = 0, found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080
Tejun Heo3adcebb2006-05-15 20:57:37 +09002081 /* has private set_mode? */
2082 if (ap->ops->set_mode) {
2083 /* FIXME: make ->set_mode handle no device case and
2084 * return error code and failing device on failure.
2085 */
2086 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2087 if (ata_dev_enabled(&ap->device[i])) {
2088 ap->ops->set_mode(ap);
2089 break;
2090 }
2091 }
2092 return 0;
2093 }
2094
Tejun Heoa6d5a512006-03-06 04:31:57 +09002095 /* step 1: calculate xfer_mask */
2096 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoacf356b2006-03-24 14:07:50 +09002097 unsigned int pio_mask, dma_mask;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002098
Tejun Heoe8e06192006-04-01 01:38:18 +09002099 dev = &ap->device[i];
2100
Tejun Heoe1211e32006-04-01 01:38:18 +09002101 if (!ata_dev_enabled(dev))
Tejun Heoa6d5a512006-03-06 04:31:57 +09002102 continue;
2103
Tejun Heo3373efd2006-05-15 20:57:53 +09002104 ata_dev_xfermask(dev);
Tejun Heoa6d5a512006-03-06 04:31:57 +09002105
Tejun Heoacf356b2006-03-24 14:07:50 +09002106 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2107 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2108 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2109 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
Alan Cox5444a6f2006-03-27 18:58:20 +01002110
Tejun Heo4f659772006-04-01 01:38:18 +09002111 found = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002112 if (dev->dma_mode)
2113 used_dma = 1;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002114 }
Tejun Heo4f659772006-04-01 01:38:18 +09002115 if (!found)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002116 goto out;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002117
2118 /* step 2: always set host PIO timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002119 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2120 dev = &ap->device[i];
2121 if (!ata_dev_enabled(dev))
2122 continue;
2123
2124 if (!dev->pio_mode) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002125 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
Tejun Heoe8e06192006-04-01 01:38:18 +09002126 rc = -EINVAL;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002127 goto out;
Tejun Heoe8e06192006-04-01 01:38:18 +09002128 }
2129
2130 dev->xfer_mode = dev->pio_mode;
2131 dev->xfer_shift = ATA_SHIFT_PIO;
2132 if (ap->ops->set_piomode)
2133 ap->ops->set_piomode(ap, dev);
2134 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
Tejun Heoa6d5a512006-03-06 04:31:57 +09002136 /* step 3: set host DMA timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002137 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2138 dev = &ap->device[i];
2139
2140 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2141 continue;
2142
2143 dev->xfer_mode = dev->dma_mode;
2144 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2145 if (ap->ops->set_dmamode)
2146 ap->ops->set_dmamode(ap, dev);
2147 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
2149 /* step 4: update devices' xfer mode */
Tejun Heo83206a22006-03-24 15:25:31 +09002150 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe8e06192006-04-01 01:38:18 +09002151 dev = &ap->device[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152
Tejun Heoe1211e32006-04-01 01:38:18 +09002153 if (!ata_dev_enabled(dev))
Tejun Heo83206a22006-03-24 15:25:31 +09002154 continue;
2155
Tejun Heo3373efd2006-05-15 20:57:53 +09002156 rc = ata_dev_set_mode(dev);
Tejun Heo5bbc53f2006-04-01 01:38:17 +09002157 if (rc)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002158 goto out;
Tejun Heo83206a22006-03-24 15:25:31 +09002159 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Tejun Heoe8e06192006-04-01 01:38:18 +09002161 /* Record simplex status. If we selected DMA then the other
2162 * host channels are not permitted to do so.
Alan Cox5444a6f2006-03-27 18:58:20 +01002163 */
Alan Cox5444a6f2006-03-27 18:58:20 +01002164 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2165 ap->host_set->simplex_claimed = 1;
2166
Tejun Heoe8e06192006-04-01 01:38:18 +09002167 /* step5: chip specific finalisation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168 if (ap->ops->post_set_mode)
2169 ap->ops->post_set_mode(ap);
2170
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002171 out:
2172 if (rc)
2173 *r_failed_dev = dev;
2174 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175}
2176
2177/**
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002178 * ata_tf_to_host - issue ATA taskfile to host controller
2179 * @ap: port to which command is being issued
2180 * @tf: ATA taskfile register set
2181 *
2182 * Issues ATA taskfile register set to ATA host controller,
2183 * with proper synchronization with interrupt handler and
2184 * other threads.
2185 *
2186 * LOCKING:
2187 * spin_lock_irqsave(host_set lock)
2188 */
2189
2190static inline void ata_tf_to_host(struct ata_port *ap,
2191 const struct ata_taskfile *tf)
2192{
2193 ap->ops->tf_load(ap, tf);
2194 ap->ops->exec_command(ap, tf);
2195}
2196
2197/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198 * ata_busy_sleep - sleep until BSY clears, or timeout
2199 * @ap: port containing status register to be polled
2200 * @tmout_pat: impatience timeout
2201 * @tmout: overall timeout
2202 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002203 * Sleep until ATA Status register bit BSY clears,
2204 * or a timeout occurs.
2205 *
2206 * LOCKING: None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 */
2208
Tejun Heo6f8b9952006-01-24 17:05:21 +09002209unsigned int ata_busy_sleep (struct ata_port *ap,
2210 unsigned long tmout_pat, unsigned long tmout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211{
2212 unsigned long timer_start, timeout;
2213 u8 status;
2214
2215 status = ata_busy_wait(ap, ATA_BUSY, 300);
2216 timer_start = jiffies;
2217 timeout = timer_start + tmout_pat;
2218 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2219 msleep(50);
2220 status = ata_busy_wait(ap, ATA_BUSY, 3);
2221 }
2222
2223 if (status & ATA_BUSY)
Tejun Heof15a1da2006-05-15 20:57:56 +09002224 ata_port_printk(ap, KERN_WARNING,
2225 "port is slow to respond, please be patient\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226
2227 timeout = timer_start + tmout;
2228 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2229 msleep(50);
2230 status = ata_chk_status(ap);
2231 }
2232
2233 if (status & ATA_BUSY) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002234 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2235 "(%lu secs)\n", tmout / HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236 return 1;
2237 }
2238
2239 return 0;
2240}
2241
2242static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2243{
2244 struct ata_ioports *ioaddr = &ap->ioaddr;
2245 unsigned int dev0 = devmask & (1 << 0);
2246 unsigned int dev1 = devmask & (1 << 1);
2247 unsigned long timeout;
2248
2249 /* if device 0 was found in ata_devchk, wait for its
2250 * BSY bit to clear
2251 */
2252 if (dev0)
2253 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2254
2255 /* if device 1 was found in ata_devchk, wait for
2256 * register access, then wait for BSY to clear
2257 */
2258 timeout = jiffies + ATA_TMOUT_BOOT;
2259 while (dev1) {
2260 u8 nsect, lbal;
2261
2262 ap->ops->dev_select(ap, 1);
2263 if (ap->flags & ATA_FLAG_MMIO) {
2264 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2265 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2266 } else {
2267 nsect = inb(ioaddr->nsect_addr);
2268 lbal = inb(ioaddr->lbal_addr);
2269 }
2270 if ((nsect == 1) && (lbal == 1))
2271 break;
2272 if (time_after(jiffies, timeout)) {
2273 dev1 = 0;
2274 break;
2275 }
2276 msleep(50); /* give drive a breather */
2277 }
2278 if (dev1)
2279 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2280
2281 /* is all this really necessary? */
2282 ap->ops->dev_select(ap, 0);
2283 if (dev1)
2284 ap->ops->dev_select(ap, 1);
2285 if (dev0)
2286 ap->ops->dev_select(ap, 0);
2287}
2288
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289static unsigned int ata_bus_softreset(struct ata_port *ap,
2290 unsigned int devmask)
2291{
2292 struct ata_ioports *ioaddr = &ap->ioaddr;
2293
2294 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2295
2296 /* software reset. causes dev0 to be selected */
2297 if (ap->flags & ATA_FLAG_MMIO) {
2298 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2299 udelay(20); /* FIXME: flush */
2300 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2301 udelay(20); /* FIXME: flush */
2302 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2303 } else {
2304 outb(ap->ctl, ioaddr->ctl_addr);
2305 udelay(10);
2306 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2307 udelay(10);
2308 outb(ap->ctl, ioaddr->ctl_addr);
2309 }
2310
2311 /* spec mandates ">= 2ms" before checking status.
2312 * We wait 150ms, because that was the magic delay used for
2313 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2314 * between when the ATA command register is written, and then
2315 * status is checked. Because waiting for "a while" before
2316 * checking status is fine, post SRST, we perform this magic
2317 * delay here as well.
Alan Cox09c7ad72006-03-22 15:52:40 +00002318 *
2319 * Old drivers/ide uses the 2mS rule and then waits for ready
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320 */
2321 msleep(150);
2322
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002323 /* Before we perform post reset processing we want to see if
Tejun Heo298a41c2006-03-25 02:58:13 +09002324 * the bus shows 0xFF because the odd clown forgets the D7
2325 * pulldown resistor.
2326 */
Tejun Heo987d2f02006-04-11 22:16:45 +09002327 if (ata_check_status(ap) == 0xFF) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002328 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
Tejun Heo298a41c2006-03-25 02:58:13 +09002329 return AC_ERR_OTHER;
Tejun Heo987d2f02006-04-11 22:16:45 +09002330 }
Alan Cox09c7ad72006-03-22 15:52:40 +00002331
Linus Torvalds1da177e2005-04-16 15:20:36 -07002332 ata_bus_post_reset(ap, devmask);
2333
2334 return 0;
2335}
2336
2337/**
2338 * ata_bus_reset - reset host port and associated ATA channel
2339 * @ap: port to reset
2340 *
2341 * This is typically the first time we actually start issuing
2342 * commands to the ATA channel. We wait for BSY to clear, then
2343 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2344 * result. Determine what devices, if any, are on the channel
2345 * by looking at the device 0/1 error register. Look at the signature
2346 * stored in each device's taskfile registers, to determine if
2347 * the device is ATA or ATAPI.
2348 *
2349 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002350 * PCI/etc. bus probe sem.
2351 * Obtains host_set lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 *
2353 * SIDE EFFECTS:
Tejun Heo198e0fe2006-04-02 18:51:52 +09002354 * Sets ATA_FLAG_DISABLED if bus reset fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 */
2356
2357void ata_bus_reset(struct ata_port *ap)
2358{
2359 struct ata_ioports *ioaddr = &ap->ioaddr;
2360 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2361 u8 err;
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002362 unsigned int dev0, dev1 = 0, devmask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363
2364 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2365
2366 /* determine if device 0/1 are present */
2367 if (ap->flags & ATA_FLAG_SATA_RESET)
2368 dev0 = 1;
2369 else {
2370 dev0 = ata_devchk(ap, 0);
2371 if (slave_possible)
2372 dev1 = ata_devchk(ap, 1);
2373 }
2374
2375 if (dev0)
2376 devmask |= (1 << 0);
2377 if (dev1)
2378 devmask |= (1 << 1);
2379
2380 /* select device 0 again */
2381 ap->ops->dev_select(ap, 0);
2382
2383 /* issue bus reset */
2384 if (ap->flags & ATA_FLAG_SRST)
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002385 if (ata_bus_softreset(ap, devmask))
2386 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387
2388 /*
2389 * determine by signature whether we have ATA or ATAPI devices
2390 */
Tejun Heob4dc7622006-01-24 17:05:22 +09002391 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 if ((slave_possible) && (err != 0x81))
Tejun Heob4dc7622006-01-24 17:05:22 +09002393 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394
2395 /* re-enable interrupts */
2396 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2397 ata_irq_on(ap);
2398
2399 /* is double-select really necessary? */
2400 if (ap->device[1].class != ATA_DEV_NONE)
2401 ap->ops->dev_select(ap, 1);
2402 if (ap->device[0].class != ATA_DEV_NONE)
2403 ap->ops->dev_select(ap, 0);
2404
2405 /* if no devices were detected, disable this port */
2406 if ((ap->device[0].class == ATA_DEV_NONE) &&
2407 (ap->device[1].class == ATA_DEV_NONE))
2408 goto err_out;
2409
2410 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2411 /* set up device control for ATA_FLAG_SATA_RESET */
2412 if (ap->flags & ATA_FLAG_MMIO)
2413 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2414 else
2415 outb(ap->ctl, ioaddr->ctl_addr);
2416 }
2417
2418 DPRINTK("EXIT\n");
2419 return;
2420
2421err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09002422 ata_port_printk(ap, KERN_ERR, "disabling port\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 ap->ops->port_disable(ap);
2424
2425 DPRINTK("EXIT\n");
2426}
2427
Tejun Heo7a7921e2006-02-02 18:20:00 +09002428static int sata_phy_resume(struct ata_port *ap)
2429{
2430 unsigned long timeout = jiffies + (HZ * 5);
Tejun Heo852ee162006-04-01 01:38:18 +09002431 u32 scontrol, sstatus;
Tejun Heo81952c52006-05-15 20:57:47 +09002432 int rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002433
Tejun Heo81952c52006-05-15 20:57:47 +09002434 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2435 return rc;
2436
Tejun Heo852ee162006-04-01 01:38:18 +09002437 scontrol = (scontrol & 0x0f0) | 0x300;
Tejun Heo81952c52006-05-15 20:57:47 +09002438
2439 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2440 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002441
2442 /* Wait for phy to become ready, if necessary. */
2443 do {
2444 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09002445 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2446 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002447 if ((sstatus & 0xf) != 1)
2448 return 0;
2449 } while (time_before(jiffies, timeout));
2450
Tejun Heo81952c52006-05-15 20:57:47 +09002451 return -EBUSY;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002452}
2453
Tejun Heoc2bd5802006-01-24 17:05:22 +09002454/**
Tejun Heo8a19ac82006-02-02 18:20:00 +09002455 * ata_std_probeinit - initialize probing
2456 * @ap: port to be probed
2457 *
2458 * @ap is about to be probed. Initialize it. This function is
2459 * to be used as standard callback for ata_drive_probe_reset().
Tejun Heo3a397462006-02-10 23:58:48 +09002460 *
2461 * NOTE!!! Do not use this function as probeinit if a low level
2462 * driver implements only hardreset. Just pass NULL as probeinit
2463 * in that case. Using this function is probably okay but doing
2464 * so makes reset sequence different from the original
2465 * ->phy_reset implementation and Jeff nervous. :-P
Tejun Heo8a19ac82006-02-02 18:20:00 +09002466 */
Alan Cox17efc5f2006-03-27 19:01:32 +01002467void ata_std_probeinit(struct ata_port *ap)
Tejun Heo8a19ac82006-02-02 18:20:00 +09002468{
Tejun Heo81952c52006-05-15 20:57:47 +09002469 u32 scontrol;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002470
Tejun Heo81952c52006-05-15 20:57:47 +09002471 /* resume link */
2472 sata_phy_resume(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002473
Tejun Heo81952c52006-05-15 20:57:47 +09002474 /* init sata_spd_limit to the current value */
2475 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2476 int spd = (scontrol >> 4) & 0xf;
2477 ap->sata_spd_limit &= (1 << spd) - 1;
Tejun Heo3a397462006-02-10 23:58:48 +09002478 }
Tejun Heo81952c52006-05-15 20:57:47 +09002479
2480 /* wait for device */
2481 if (ata_port_online(ap))
2482 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
Tejun Heo8a19ac82006-02-02 18:20:00 +09002483}
2484
2485/**
Tejun Heoc2bd5802006-01-24 17:05:22 +09002486 * ata_std_softreset - reset host port via ATA SRST
2487 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002488 * @classes: resulting classes of attached devices
2489 *
2490 * Reset host port using ATA SRST. This function is to be used
2491 * as standard callback for ata_drive_*_reset() functions.
2492 *
2493 * LOCKING:
2494 * Kernel thread context (may sleep)
2495 *
2496 * RETURNS:
2497 * 0 on success, -errno otherwise.
2498 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002499int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002500{
2501 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2502 unsigned int devmask = 0, err_mask;
2503 u8 err;
2504
2505 DPRINTK("ENTER\n");
2506
Tejun Heo81952c52006-05-15 20:57:47 +09002507 if (ata_port_offline(ap)) {
Tejun Heo3a397462006-02-10 23:58:48 +09002508 classes[0] = ATA_DEV_NONE;
2509 goto out;
2510 }
2511
Tejun Heoc2bd5802006-01-24 17:05:22 +09002512 /* determine if device 0/1 are present */
2513 if (ata_devchk(ap, 0))
2514 devmask |= (1 << 0);
2515 if (slave_possible && ata_devchk(ap, 1))
2516 devmask |= (1 << 1);
2517
Tejun Heoc2bd5802006-01-24 17:05:22 +09002518 /* select device 0 again */
2519 ap->ops->dev_select(ap, 0);
2520
2521 /* issue bus reset */
2522 DPRINTK("about to softreset, devmask=%x\n", devmask);
2523 err_mask = ata_bus_softreset(ap, devmask);
2524 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002525 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2526 err_mask);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002527 return -EIO;
2528 }
2529
2530 /* determine by signature whether we have ATA or ATAPI devices */
2531 classes[0] = ata_dev_try_classify(ap, 0, &err);
2532 if (slave_possible && err != 0x81)
2533 classes[1] = ata_dev_try_classify(ap, 1, &err);
2534
Tejun Heo3a397462006-02-10 23:58:48 +09002535 out:
Tejun Heoc2bd5802006-01-24 17:05:22 +09002536 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2537 return 0;
2538}
2539
2540/**
2541 * sata_std_hardreset - reset host port via SATA phy reset
2542 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002543 * @class: resulting class of attached device
2544 *
2545 * SATA phy-reset host port using DET bits of SControl register.
2546 * This function is to be used as standard callback for
2547 * ata_drive_*_reset().
2548 *
2549 * LOCKING:
2550 * Kernel thread context (may sleep)
2551 *
2552 * RETURNS:
2553 * 0 on success, -errno otherwise.
2554 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002555int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002556{
Tejun Heo852ee162006-04-01 01:38:18 +09002557 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002558 int rc;
Tejun Heo852ee162006-04-01 01:38:18 +09002559
Tejun Heoc2bd5802006-01-24 17:05:22 +09002560 DPRINTK("ENTER\n");
2561
Tejun Heo3c567b72006-05-15 20:57:23 +09002562 if (sata_set_spd_needed(ap)) {
Tejun Heo1c3fae42006-04-02 20:53:28 +09002563 /* SATA spec says nothing about how to reconfigure
2564 * spd. To be on the safe side, turn off phy during
2565 * reconfiguration. This works for at least ICH7 AHCI
2566 * and Sil3124.
2567 */
Tejun Heo81952c52006-05-15 20:57:47 +09002568 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2569 return rc;
2570
Tejun Heo1c3fae42006-04-02 20:53:28 +09002571 scontrol = (scontrol & 0x0f0) | 0x302;
Tejun Heo81952c52006-05-15 20:57:47 +09002572
2573 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2574 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002575
Tejun Heo3c567b72006-05-15 20:57:23 +09002576 sata_set_spd(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002577 }
2578
2579 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09002580 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2581 return rc;
2582
Tejun Heo852ee162006-04-01 01:38:18 +09002583 scontrol = (scontrol & 0x0f0) | 0x301;
Tejun Heo81952c52006-05-15 20:57:47 +09002584
2585 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2586 return rc;
Tejun Heoc2bd5802006-01-24 17:05:22 +09002587
Tejun Heo1c3fae42006-04-02 20:53:28 +09002588 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
Tejun Heoc2bd5802006-01-24 17:05:22 +09002589 * 10.4.2 says at least 1 ms.
2590 */
2591 msleep(1);
2592
Tejun Heo1c3fae42006-04-02 20:53:28 +09002593 /* bring phy back */
Tejun Heo7a7921e2006-02-02 18:20:00 +09002594 sata_phy_resume(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002595
Tejun Heoc2bd5802006-01-24 17:05:22 +09002596 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09002597 if (ata_port_offline(ap)) {
Tejun Heoc2bd5802006-01-24 17:05:22 +09002598 *class = ATA_DEV_NONE;
2599 DPRINTK("EXIT, link offline\n");
2600 return 0;
2601 }
2602
2603 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002604 ata_port_printk(ap, KERN_ERR,
2605 "COMRESET failed (device not ready)\n");
Tejun Heoc2bd5802006-01-24 17:05:22 +09002606 return -EIO;
2607 }
2608
Tejun Heo3a397462006-02-10 23:58:48 +09002609 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2610
Tejun Heoc2bd5802006-01-24 17:05:22 +09002611 *class = ata_dev_try_classify(ap, 0, NULL);
2612
2613 DPRINTK("EXIT, class=%u\n", *class);
2614 return 0;
2615}
2616
2617/**
2618 * ata_std_postreset - standard postreset callback
2619 * @ap: the target ata_port
2620 * @classes: classes of attached devices
2621 *
2622 * This function is invoked after a successful reset. Note that
2623 * the device might have been reset more than once using
2624 * different reset methods before postreset is invoked.
Tejun Heoc2bd5802006-01-24 17:05:22 +09002625 *
2626 * This function is to be used as standard callback for
2627 * ata_drive_*_reset().
2628 *
2629 * LOCKING:
2630 * Kernel thread context (may sleep)
2631 */
2632void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2633{
Tejun Heodc2b3512006-05-15 20:58:00 +09002634 u32 serror;
2635
Tejun Heoc2bd5802006-01-24 17:05:22 +09002636 DPRINTK("ENTER\n");
2637
Tejun Heoc2bd5802006-01-24 17:05:22 +09002638 /* print link status */
Tejun Heo81952c52006-05-15 20:57:47 +09002639 sata_print_link_status(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002640
Tejun Heodc2b3512006-05-15 20:58:00 +09002641 /* clear SError */
2642 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
2643 sata_scr_write(ap, SCR_ERROR, serror);
2644
Tejun Heo3a397462006-02-10 23:58:48 +09002645 /* re-enable interrupts */
Tejun Heoe3180492006-05-15 20:58:09 +09002646 if (!ap->ops->error_handler) {
2647 /* FIXME: hack. create a hook instead */
2648 if (ap->ioaddr.ctl_addr)
2649 ata_irq_on(ap);
2650 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09002651
2652 /* is double-select really necessary? */
2653 if (classes[0] != ATA_DEV_NONE)
2654 ap->ops->dev_select(ap, 1);
2655 if (classes[1] != ATA_DEV_NONE)
2656 ap->ops->dev_select(ap, 0);
2657
Tejun Heo3a397462006-02-10 23:58:48 +09002658 /* bail out if no device is present */
2659 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2660 DPRINTK("EXIT, no device\n");
2661 return;
2662 }
2663
2664 /* set up device control */
2665 if (ap->ioaddr.ctl_addr) {
2666 if (ap->flags & ATA_FLAG_MMIO)
2667 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2668 else
2669 outb(ap->ctl, ap->ioaddr.ctl_addr);
2670 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09002671
2672 DPRINTK("EXIT\n");
2673}
2674
2675/**
2676 * ata_std_probe_reset - standard probe reset method
2677 * @ap: prot to perform probe-reset
2678 * @classes: resulting classes of attached devices
2679 *
2680 * The stock off-the-shelf ->probe_reset method.
2681 *
2682 * LOCKING:
2683 * Kernel thread context (may sleep)
2684 *
2685 * RETURNS:
2686 * 0 on success, -errno otherwise.
2687 */
2688int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2689{
2690 ata_reset_fn_t hardreset;
2691
2692 hardreset = NULL;
Tejun Heo81952c52006-05-15 20:57:47 +09002693 if (sata_scr_valid(ap))
Tejun Heoc2bd5802006-01-24 17:05:22 +09002694 hardreset = sata_std_hardreset;
2695
Tejun Heo8a19ac82006-02-02 18:20:00 +09002696 return ata_drive_probe_reset(ap, ata_std_probeinit,
Tejun Heo7944ea92006-02-02 18:20:00 +09002697 ata_std_softreset, hardreset,
Tejun Heoc2bd5802006-01-24 17:05:22 +09002698 ata_std_postreset, classes);
2699}
2700
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002701int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
Tejun Heo96bd39e2006-05-15 20:57:38 +09002702 unsigned int *classes)
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002703{
2704 int i, rc;
2705
2706 for (i = 0; i < ATA_MAX_DEVICES; i++)
2707 classes[i] = ATA_DEV_UNKNOWN;
2708
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002709 rc = reset(ap, classes);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002710 if (rc)
2711 return rc;
2712
2713 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2714 * is complete and convert all ATA_DEV_UNKNOWN to
2715 * ATA_DEV_NONE.
2716 */
2717 for (i = 0; i < ATA_MAX_DEVICES; i++)
2718 if (classes[i] != ATA_DEV_UNKNOWN)
2719 break;
2720
2721 if (i < ATA_MAX_DEVICES)
2722 for (i = 0; i < ATA_MAX_DEVICES; i++)
2723 if (classes[i] == ATA_DEV_UNKNOWN)
2724 classes[i] = ATA_DEV_NONE;
2725
Tejun Heo9974e7c2006-04-01 01:38:17 +09002726 return 0;
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002727}
2728
2729/**
2730 * ata_drive_probe_reset - Perform probe reset with given methods
2731 * @ap: port to reset
Tejun Heo7944ea92006-02-02 18:20:00 +09002732 * @probeinit: probeinit method (can be NULL)
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002733 * @softreset: softreset method (can be NULL)
2734 * @hardreset: hardreset method (can be NULL)
2735 * @postreset: postreset method (can be NULL)
2736 * @classes: resulting classes of attached devices
2737 *
2738 * Reset the specified port and classify attached devices using
2739 * given methods. This function prefers softreset but tries all
2740 * possible reset sequences to reset and classify devices. This
2741 * function is intended to be used for constructing ->probe_reset
2742 * callback by low level drivers.
2743 *
2744 * Reset methods should follow the following rules.
2745 *
2746 * - Return 0 on sucess, -errno on failure.
2747 * - If classification is supported, fill classes[] with
2748 * recognized class codes.
2749 * - If classification is not supported, leave classes[] alone.
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002750 *
2751 * LOCKING:
2752 * Kernel thread context (may sleep)
2753 *
2754 * RETURNS:
2755 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2756 * if classification fails, and any error code from reset
2757 * methods.
2758 */
Tejun Heo7944ea92006-02-02 18:20:00 +09002759int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002760 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2761 ata_postreset_fn_t postreset, unsigned int *classes)
2762{
2763 int rc = -EINVAL;
2764
Tejun Heoe3180492006-05-15 20:58:09 +09002765 ata_eh_freeze_port(ap);
2766
Tejun Heo7944ea92006-02-02 18:20:00 +09002767 if (probeinit)
2768 probeinit(ap);
2769
Tejun Heo3c567b72006-05-15 20:57:23 +09002770 if (softreset && !sata_set_spd_needed(ap)) {
Tejun Heo96bd39e2006-05-15 20:57:38 +09002771 rc = ata_do_reset(ap, softreset, classes);
Tejun Heo9974e7c2006-04-01 01:38:17 +09002772 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2773 goto done;
Tejun Heof15a1da2006-05-15 20:57:56 +09002774 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2775 "will try hardreset in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002776 ssleep(5);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002777 }
2778
2779 if (!hardreset)
Tejun Heo9974e7c2006-04-01 01:38:17 +09002780 goto done;
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002781
Tejun Heo90dac022006-04-02 17:54:46 +09002782 while (1) {
Tejun Heo96bd39e2006-05-15 20:57:38 +09002783 rc = ata_do_reset(ap, hardreset, classes);
Tejun Heo90dac022006-04-02 17:54:46 +09002784 if (rc == 0) {
2785 if (classes[0] != ATA_DEV_UNKNOWN)
2786 goto done;
2787 break;
2788 }
2789
Tejun Heo3c567b72006-05-15 20:57:23 +09002790 if (sata_down_spd_limit(ap))
Tejun Heo90dac022006-04-02 17:54:46 +09002791 goto done;
Tejun Heoedbabd82006-04-02 20:55:02 +09002792
Tejun Heof15a1da2006-05-15 20:57:56 +09002793 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2794 "will retry in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002795 ssleep(5);
Tejun Heo90dac022006-04-02 17:54:46 +09002796 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002797
Tejun Heoedbabd82006-04-02 20:55:02 +09002798 if (softreset) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002799 ata_port_printk(ap, KERN_INFO,
2800 "hardreset succeeded without classification, "
2801 "will retry softreset in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002802 ssleep(5);
2803
Tejun Heo96bd39e2006-05-15 20:57:38 +09002804 rc = ata_do_reset(ap, softreset, classes);
Tejun Heoedbabd82006-04-02 20:55:02 +09002805 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002806
Tejun Heo9974e7c2006-04-01 01:38:17 +09002807 done:
Tejun Heo96bd39e2006-05-15 20:57:38 +09002808 if (rc == 0) {
2809 if (postreset)
2810 postreset(ap, classes);
Tejun Heoe3180492006-05-15 20:58:09 +09002811
2812 ata_eh_thaw_port(ap);
2813
Tejun Heo96bd39e2006-05-15 20:57:38 +09002814 if (classes[0] == ATA_DEV_UNKNOWN)
2815 rc = -ENODEV;
2816 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002817 return rc;
2818}
2819
Tejun Heo623a3122006-03-05 17:55:58 +09002820/**
2821 * ata_dev_same_device - Determine whether new ID matches configured device
Tejun Heo623a3122006-03-05 17:55:58 +09002822 * @dev: device to compare against
2823 * @new_class: class of the new device
2824 * @new_id: IDENTIFY page of the new device
2825 *
2826 * Compare @new_class and @new_id against @dev and determine
2827 * whether @dev is the device indicated by @new_class and
2828 * @new_id.
2829 *
2830 * LOCKING:
2831 * None.
2832 *
2833 * RETURNS:
2834 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2835 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002836static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2837 const u16 *new_id)
Tejun Heo623a3122006-03-05 17:55:58 +09002838{
2839 const u16 *old_id = dev->id;
2840 unsigned char model[2][41], serial[2][21];
2841 u64 new_n_sectors;
2842
2843 if (dev->class != new_class) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002844 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2845 dev->class, new_class);
Tejun Heo623a3122006-03-05 17:55:58 +09002846 return 0;
2847 }
2848
2849 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2850 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2851 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2852 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2853 new_n_sectors = ata_id_n_sectors(new_id);
2854
2855 if (strcmp(model[0], model[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002856 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2857 "'%s' != '%s'\n", model[0], model[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09002858 return 0;
2859 }
2860
2861 if (strcmp(serial[0], serial[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002862 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2863 "'%s' != '%s'\n", serial[0], serial[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09002864 return 0;
2865 }
2866
2867 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002868 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2869 "%llu != %llu\n",
2870 (unsigned long long)dev->n_sectors,
2871 (unsigned long long)new_n_sectors);
Tejun Heo623a3122006-03-05 17:55:58 +09002872 return 0;
2873 }
2874
2875 return 1;
2876}
2877
2878/**
2879 * ata_dev_revalidate - Revalidate ATA device
Tejun Heo623a3122006-03-05 17:55:58 +09002880 * @dev: device to revalidate
2881 * @post_reset: is this revalidation after reset?
2882 *
2883 * Re-read IDENTIFY page and make sure @dev is still attached to
2884 * the port.
2885 *
2886 * LOCKING:
2887 * Kernel thread context (may sleep)
2888 *
2889 * RETURNS:
2890 * 0 on success, negative errno otherwise
2891 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002892int ata_dev_revalidate(struct ata_device *dev, int post_reset)
Tejun Heo623a3122006-03-05 17:55:58 +09002893{
Tejun Heo5eb45c02006-04-02 18:51:52 +09002894 unsigned int class = dev->class;
Tejun Heof15a1da2006-05-15 20:57:56 +09002895 u16 *id = (void *)dev->ap->sector_buf;
Tejun Heo623a3122006-03-05 17:55:58 +09002896 int rc;
2897
Tejun Heo5eb45c02006-04-02 18:51:52 +09002898 if (!ata_dev_enabled(dev)) {
2899 rc = -ENODEV;
2900 goto fail;
2901 }
Tejun Heo623a3122006-03-05 17:55:58 +09002902
Tejun Heofe635c72006-05-15 20:57:35 +09002903 /* read ID data */
Tejun Heo3373efd2006-05-15 20:57:53 +09002904 rc = ata_dev_read_id(dev, &class, post_reset, id);
Tejun Heo623a3122006-03-05 17:55:58 +09002905 if (rc)
2906 goto fail;
2907
2908 /* is the device still there? */
Tejun Heo3373efd2006-05-15 20:57:53 +09002909 if (!ata_dev_same_device(dev, class, id)) {
Tejun Heo623a3122006-03-05 17:55:58 +09002910 rc = -ENODEV;
2911 goto fail;
2912 }
2913
Tejun Heofe635c72006-05-15 20:57:35 +09002914 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo623a3122006-03-05 17:55:58 +09002915
2916 /* configure device according to the new ID */
Tejun Heo3373efd2006-05-15 20:57:53 +09002917 rc = ata_dev_configure(dev, 0);
Tejun Heo5eb45c02006-04-02 18:51:52 +09002918 if (rc == 0)
2919 return 0;
Tejun Heo623a3122006-03-05 17:55:58 +09002920
2921 fail:
Tejun Heof15a1da2006-05-15 20:57:56 +09002922 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
Tejun Heo623a3122006-03-05 17:55:58 +09002923 return rc;
2924}
2925
Arjan van de Ven98ac62d2005-11-28 10:06:23 +01002926static const char * const ata_dma_blacklist [] = {
Alan Coxf4b15fe2006-03-22 15:54:04 +00002927 "WDC AC11000H", NULL,
2928 "WDC AC22100H", NULL,
2929 "WDC AC32500H", NULL,
2930 "WDC AC33100H", NULL,
2931 "WDC AC31600H", NULL,
2932 "WDC AC32100H", "24.09P07",
2933 "WDC AC23200L", "21.10N21",
2934 "Compaq CRD-8241B", NULL,
2935 "CRD-8400B", NULL,
2936 "CRD-8480B", NULL,
2937 "CRD-8482B", NULL,
2938 "CRD-84", NULL,
2939 "SanDisk SDP3B", NULL,
2940 "SanDisk SDP3B-64", NULL,
2941 "SANYO CD-ROM CRD", NULL,
2942 "HITACHI CDR-8", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002943 "HITACHI CDR-8335", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002944 "HITACHI CDR-8435", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002945 "Toshiba CD-ROM XM-6202B", NULL,
2946 "TOSHIBA CD-ROM XM-1702BC", NULL,
2947 "CD-532E-A", NULL,
2948 "E-IDE CD-ROM CR-840", NULL,
2949 "CD-ROM Drive/F5A", NULL,
2950 "WPI CDD-820", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002951 "SAMSUNG CD-ROM SC-148C", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002952 "SAMSUNG CD-ROM SC", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002953 "SanDisk SDP3B-64", NULL,
2954 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2955 "_NEC DV5800A", NULL,
2956 "SAMSUNG CD-ROM SN-124", "N001"
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957};
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002958
Alan Coxf4b15fe2006-03-22 15:54:04 +00002959static int ata_strim(char *s, size_t len)
2960{
2961 len = strnlen(s, len);
2962
2963 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2964 while ((len > 0) && (s[len - 1] == ' ')) {
2965 len--;
2966 s[len] = 0;
2967 }
2968 return len;
2969}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002970
Jeff Garzik057ace52005-10-22 14:27:05 -04002971static int ata_dma_blacklisted(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972{
Alan Coxf4b15fe2006-03-22 15:54:04 +00002973 unsigned char model_num[40];
2974 unsigned char model_rev[16];
2975 unsigned int nlen, rlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 int i;
2977
Alan Coxf4b15fe2006-03-22 15:54:04 +00002978 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2979 sizeof(model_num));
2980 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2981 sizeof(model_rev));
2982 nlen = ata_strim(model_num, sizeof(model_num));
2983 rlen = ata_strim(model_rev, sizeof(model_rev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002984
Alan Coxf4b15fe2006-03-22 15:54:04 +00002985 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2986 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2987 if (ata_dma_blacklist[i+1] == NULL)
2988 return 1;
2989 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2990 return 1;
2991 }
2992 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 return 0;
2994}
2995
Tejun Heoa6d5a512006-03-06 04:31:57 +09002996/**
2997 * ata_dev_xfermask - Compute supported xfermask of the given device
Tejun Heoa6d5a512006-03-06 04:31:57 +09002998 * @dev: Device to compute xfermask for
2999 *
Tejun Heoacf356b2006-03-24 14:07:50 +09003000 * Compute supported xfermask of @dev and store it in
3001 * dev->*_mask. This function is responsible for applying all
3002 * known limits including host controller limits, device
3003 * blacklist, etc...
Tejun Heoa6d5a512006-03-06 04:31:57 +09003004 *
Tejun Heo600511e2006-03-25 11:14:07 +09003005 * FIXME: The current implementation limits all transfer modes to
3006 * the fastest of the lowested device on the port. This is not
Tejun Heo05c8e0a2006-03-25 14:28:57 +09003007 * required on most controllers.
Tejun Heo600511e2006-03-25 11:14:07 +09003008 *
Tejun Heoa6d5a512006-03-06 04:31:57 +09003009 * LOCKING:
3010 * None.
Tejun Heoa6d5a512006-03-06 04:31:57 +09003011 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003012static void ata_dev_xfermask(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013{
Tejun Heo3373efd2006-05-15 20:57:53 +09003014 struct ata_port *ap = dev->ap;
Alan Cox5444a6f2006-03-27 18:58:20 +01003015 struct ata_host_set *hs = ap->host_set;
Tejun Heoa6d5a512006-03-06 04:31:57 +09003016 unsigned long xfer_mask;
3017 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018
Tejun Heo565083e2006-04-02 17:54:47 +09003019 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3020 ap->mwdma_mask, ap->udma_mask);
3021
3022 /* Apply cable rule here. Don't apply it early because when
3023 * we handle hot plug the cable type can itself change.
3024 */
3025 if (ap->cbl == ATA_CBL_PATA40)
3026 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027
Alan Cox5444a6f2006-03-27 18:58:20 +01003028 /* FIXME: Use port-wide xfermask for now */
Tejun Heoa6d5a512006-03-06 04:31:57 +09003029 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3030 struct ata_device *d = &ap->device[i];
Tejun Heo565083e2006-04-02 17:54:47 +09003031
3032 if (ata_dev_absent(d))
Tejun Heoa6d5a512006-03-06 04:31:57 +09003033 continue;
Tejun Heo565083e2006-04-02 17:54:47 +09003034
3035 if (ata_dev_disabled(d)) {
3036 /* to avoid violating device selection timing */
3037 xfer_mask &= ata_pack_xfermask(d->pio_mask,
3038 UINT_MAX, UINT_MAX);
3039 continue;
3040 }
3041
3042 xfer_mask &= ata_pack_xfermask(d->pio_mask,
3043 d->mwdma_mask, d->udma_mask);
Tejun Heoa6d5a512006-03-06 04:31:57 +09003044 xfer_mask &= ata_id_xfermask(d->id);
3045 if (ata_dma_blacklisted(d))
3046 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047 }
3048
Tejun Heoa6d5a512006-03-06 04:31:57 +09003049 if (ata_dma_blacklisted(dev))
Tejun Heof15a1da2006-05-15 20:57:56 +09003050 ata_dev_printk(dev, KERN_WARNING,
3051 "device is on DMA blacklist, disabling DMA\n");
Tejun Heoa6d5a512006-03-06 04:31:57 +09003052
Alan Cox5444a6f2006-03-27 18:58:20 +01003053 if (hs->flags & ATA_HOST_SIMPLEX) {
3054 if (hs->simplex_claimed)
3055 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3056 }
Tejun Heo565083e2006-04-02 17:54:47 +09003057
Alan Cox5444a6f2006-03-27 18:58:20 +01003058 if (ap->ops->mode_filter)
3059 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
3060
Tejun Heo565083e2006-04-02 17:54:47 +09003061 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3062 &dev->mwdma_mask, &dev->udma_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063}
3064
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 * @dev: Device to which command will be sent
3068 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003069 * Issue SET FEATURES - XFER MODE command to device @dev
3070 * on port @ap.
3071 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003073 * PCI/etc. bus probe sem.
Tejun Heo83206a22006-03-24 15:25:31 +09003074 *
3075 * RETURNS:
3076 * 0 on success, AC_ERR_* mask otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003077 */
3078
Tejun Heo3373efd2006-05-15 20:57:53 +09003079static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080{
Tejun Heoa0123702005-12-13 14:49:31 +09003081 struct ata_taskfile tf;
Tejun Heo83206a22006-03-24 15:25:31 +09003082 unsigned int err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083
3084 /* set up set-features taskfile */
3085 DPRINTK("set features - xfer mode\n");
3086
Tejun Heo3373efd2006-05-15 20:57:53 +09003087 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003088 tf.command = ATA_CMD_SET_FEATURES;
3089 tf.feature = SETFEATURES_XFER;
3090 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3091 tf.protocol = ATA_PROT_NODATA;
3092 tf.nsect = dev->xfer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003093
Tejun Heo3373efd2006-05-15 20:57:53 +09003094 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095
Tejun Heo83206a22006-03-24 15:25:31 +09003096 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3097 return err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098}
3099
3100/**
Albert Lee8bf62ece2005-05-12 15:29:42 -04003101 * ata_dev_init_params - Issue INIT DEV PARAMS command
Albert Lee8bf62ece2005-05-12 15:29:42 -04003102 * @dev: Device to which command will be sent
Randy Dunlape2a7f772006-05-18 10:50:18 -07003103 * @heads: Number of heads (taskfile parameter)
3104 * @sectors: Number of sectors (taskfile parameter)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003105 *
3106 * LOCKING:
Tejun Heo6aff8f12006-02-15 18:24:09 +09003107 * Kernel thread context (may sleep)
3108 *
3109 * RETURNS:
3110 * 0 on success, AC_ERR_* mask otherwise.
Albert Lee8bf62ece2005-05-12 15:29:42 -04003111 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003112static unsigned int ata_dev_init_params(struct ata_device *dev,
3113 u16 heads, u16 sectors)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003114{
Tejun Heoa0123702005-12-13 14:49:31 +09003115 struct ata_taskfile tf;
Tejun Heo6aff8f12006-02-15 18:24:09 +09003116 unsigned int err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003117
3118 /* Number of sectors per track 1-255. Number of heads 1-16 */
3119 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
Albert Lee00b6f5e2006-03-27 16:39:18 +08003120 return AC_ERR_INVALID;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003121
3122 /* set up init dev params taskfile */
3123 DPRINTK("init dev params \n");
3124
Tejun Heo3373efd2006-05-15 20:57:53 +09003125 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003126 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3127 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3128 tf.protocol = ATA_PROT_NODATA;
3129 tf.nsect = sectors;
3130 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
Albert Lee8bf62ece2005-05-12 15:29:42 -04003131
Tejun Heo3373efd2006-05-15 20:57:53 +09003132 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Albert Lee8bf62ece2005-05-12 15:29:42 -04003133
Tejun Heo6aff8f12006-02-15 18:24:09 +09003134 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3135 return err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003136}
3137
3138/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003139 * ata_sg_clean - Unmap DMA memory associated with command
3140 * @qc: Command containing DMA memory to be released
3141 *
3142 * Unmap all mapped DMA memory associated with this command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 *
3144 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003145 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003146 */
3147
3148static void ata_sg_clean(struct ata_queued_cmd *qc)
3149{
3150 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003151 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003152 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003153 void *pad_buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003154
Tejun Heoa46314742006-02-11 19:11:13 +09003155 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3156 WARN_ON(sg == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003157
3158 if (qc->flags & ATA_QCFLAG_SINGLE)
Jeff Garzikf1318832006-02-20 16:55:56 -05003159 WARN_ON(qc->n_elem > 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05003161 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003162
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003163 /* if we padded the buffer out to 32-bit bound, and data
3164 * xfer direction is from-device, we must copy from the
3165 * pad buffer back into the supplied buffer
3166 */
3167 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3168 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3169
3170 if (qc->flags & ATA_QCFLAG_SG) {
Jeff Garzike1410f22005-11-14 14:06:26 -05003171 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003172 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003173 /* restore last sg */
3174 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3175 if (pad_buf) {
3176 struct scatterlist *psg = &qc->pad_sgent;
3177 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3178 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003179 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003180 }
3181 } else {
Tejun Heo2e242fa2006-02-20 23:48:38 +09003182 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003183 dma_unmap_single(ap->dev,
Jeff Garzike1410f22005-11-14 14:06:26 -05003184 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3185 dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003186 /* restore sg */
3187 sg->length += qc->pad_len;
3188 if (pad_buf)
3189 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3190 pad_buf, qc->pad_len);
3191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003192
3193 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003194 qc->__sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003195}
3196
3197/**
3198 * ata_fill_sg - Fill PCI IDE PRD table
3199 * @qc: Metadata associated with taskfile to be transferred
3200 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003201 * Fill PCI IDE PRD (scatter-gather) table with segments
3202 * associated with the current disk command.
3203 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003204 * LOCKING:
Jeff Garzik780a87f2005-05-30 15:41:05 -04003205 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003206 *
3207 */
3208static void ata_fill_sg(struct ata_queued_cmd *qc)
3209{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003210 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003211 struct scatterlist *sg;
3212 unsigned int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003213
Tejun Heoa46314742006-02-11 19:11:13 +09003214 WARN_ON(qc->__sg == NULL);
Jeff Garzikf1318832006-02-20 16:55:56 -05003215 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003216
3217 idx = 0;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003218 ata_for_each_sg(sg, qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003219 u32 addr, offset;
3220 u32 sg_len, len;
3221
3222 /* determine if physical DMA addr spans 64K boundary.
3223 * Note h/w doesn't support 64-bit, so we unconditionally
3224 * truncate dma_addr_t to u32.
3225 */
3226 addr = (u32) sg_dma_address(sg);
3227 sg_len = sg_dma_len(sg);
3228
3229 while (sg_len) {
3230 offset = addr & 0xffff;
3231 len = sg_len;
3232 if ((offset + sg_len) > 0x10000)
3233 len = 0x10000 - offset;
3234
3235 ap->prd[idx].addr = cpu_to_le32(addr);
3236 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3237 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3238
3239 idx++;
3240 sg_len -= len;
3241 addr += len;
3242 }
3243 }
3244
3245 if (idx)
3246 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3247}
3248/**
3249 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3250 * @qc: Metadata associated with taskfile to check
3251 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003252 * Allow low-level driver to filter ATA PACKET commands, returning
3253 * a status indicating whether or not it is OK to use DMA for the
3254 * supplied PACKET command.
3255 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003256 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003257 * spin_lock_irqsave(host_set lock)
3258 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003259 * RETURNS: 0 when ATAPI DMA can be used
3260 * nonzero otherwise
3261 */
3262int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3263{
3264 struct ata_port *ap = qc->ap;
3265 int rc = 0; /* Assume ATAPI DMA is OK by default */
3266
3267 if (ap->ops->check_atapi_dma)
3268 rc = ap->ops->check_atapi_dma(qc);
3269
Albert Leec2bbc552006-03-25 17:56:55 +08003270 /* We don't support polling DMA.
3271 * Use PIO if the LLDD handles only interrupts in
3272 * the HSM_ST_LAST state and the ATAPI device
3273 * generates CDB interrupts.
3274 */
3275 if ((ap->flags & ATA_FLAG_PIO_POLLING) &&
3276 (qc->dev->flags & ATA_DFLAG_CDB_INTR))
3277 rc = 1;
3278
Linus Torvalds1da177e2005-04-16 15:20:36 -07003279 return rc;
3280}
3281/**
3282 * ata_qc_prep - Prepare taskfile for submission
3283 * @qc: Metadata associated with taskfile to be prepared
3284 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003285 * Prepare ATA taskfile for submission.
3286 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287 * LOCKING:
3288 * spin_lock_irqsave(host_set lock)
3289 */
3290void ata_qc_prep(struct ata_queued_cmd *qc)
3291{
3292 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3293 return;
3294
3295 ata_fill_sg(qc);
3296}
3297
Brian Kinge46834c2006-03-17 17:04:03 -06003298void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3299
Jeff Garzik0cba6322005-05-30 19:49:12 -04003300/**
3301 * ata_sg_init_one - Associate command with memory buffer
3302 * @qc: Command to be associated
3303 * @buf: Memory buffer
3304 * @buflen: Length of memory buffer, in bytes.
3305 *
3306 * Initialize the data-related elements of queued_cmd @qc
3307 * to point to a single memory buffer, @buf of byte length @buflen.
3308 *
3309 * LOCKING:
3310 * spin_lock_irqsave(host_set lock)
3311 */
3312
Linus Torvalds1da177e2005-04-16 15:20:36 -07003313void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3314{
3315 struct scatterlist *sg;
3316
3317 qc->flags |= ATA_QCFLAG_SINGLE;
3318
3319 memset(&qc->sgent, 0, sizeof(qc->sgent));
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003320 qc->__sg = &qc->sgent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003321 qc->n_elem = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003322 qc->orig_n_elem = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003323 qc->buf_virt = buf;
3324
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003325 sg = qc->__sg;
Jeff Garzikf0612bb2005-10-30 01:58:18 -05003326 sg_init_one(sg, buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003327}
3328
Jeff Garzik0cba6322005-05-30 19:49:12 -04003329/**
3330 * ata_sg_init - Associate command with scatter-gather table.
3331 * @qc: Command to be associated
3332 * @sg: Scatter-gather table.
3333 * @n_elem: Number of elements in s/g table.
3334 *
3335 * Initialize the data-related elements of queued_cmd @qc
3336 * to point to a scatter-gather table @sg, containing @n_elem
3337 * elements.
3338 *
3339 * LOCKING:
3340 * spin_lock_irqsave(host_set lock)
3341 */
3342
Linus Torvalds1da177e2005-04-16 15:20:36 -07003343void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3344 unsigned int n_elem)
3345{
3346 qc->flags |= ATA_QCFLAG_SG;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003347 qc->__sg = sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003348 qc->n_elem = n_elem;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003349 qc->orig_n_elem = n_elem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003350}
3351
3352/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003353 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3354 * @qc: Command with memory buffer to be mapped.
3355 *
3356 * DMA-map the memory buffer associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357 *
3358 * LOCKING:
3359 * spin_lock_irqsave(host_set lock)
3360 *
3361 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003362 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003363 */
3364
3365static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3366{
3367 struct ata_port *ap = qc->ap;
3368 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003369 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003370 dma_addr_t dma_address;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003371 int trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003372
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003373 /* we must lengthen transfers to end on a 32-bit boundary */
3374 qc->pad_len = sg->length & 3;
3375 if (qc->pad_len) {
3376 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3377 struct scatterlist *psg = &qc->pad_sgent;
3378
Tejun Heoa46314742006-02-11 19:11:13 +09003379 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003380
3381 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3382
3383 if (qc->tf.flags & ATA_TFLAG_WRITE)
3384 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3385 qc->pad_len);
3386
3387 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3388 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3389 /* trim sg */
3390 sg->length -= qc->pad_len;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003391 if (sg->length == 0)
3392 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003393
3394 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3395 sg->length, qc->pad_len);
3396 }
3397
Tejun Heo2e242fa2006-02-20 23:48:38 +09003398 if (trim_sg) {
3399 qc->n_elem--;
Jeff Garzike1410f22005-11-14 14:06:26 -05003400 goto skip_map;
3401 }
3402
Brian King2f1f6102006-03-23 17:30:15 -06003403 dma_address = dma_map_single(ap->dev, qc->buf_virt,
Albert Lee32529e02005-05-26 03:49:42 -04003404 sg->length, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003405 if (dma_mapping_error(dma_address)) {
3406 /* restore sg */
3407 sg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003408 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003410
3411 sg_dma_address(sg) = dma_address;
Albert Lee32529e02005-05-26 03:49:42 -04003412 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003413
Tejun Heo2e242fa2006-02-20 23:48:38 +09003414skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003415 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3416 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3417
3418 return 0;
3419}
3420
3421/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003422 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3423 * @qc: Command with scatter-gather table to be mapped.
3424 *
3425 * DMA-map the scatter-gather table associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003426 *
3427 * LOCKING:
3428 * spin_lock_irqsave(host_set lock)
3429 *
3430 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003431 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003432 *
3433 */
3434
3435static int ata_sg_setup(struct ata_queued_cmd *qc)
3436{
3437 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003438 struct scatterlist *sg = qc->__sg;
3439 struct scatterlist *lsg = &sg[qc->n_elem - 1];
Jeff Garzike1410f22005-11-14 14:06:26 -05003440 int n_elem, pre_n_elem, dir, trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003441
3442 VPRINTK("ENTER, ata%u\n", ap->id);
Tejun Heoa46314742006-02-11 19:11:13 +09003443 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003444
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003445 /* we must lengthen transfers to end on a 32-bit boundary */
3446 qc->pad_len = lsg->length & 3;
3447 if (qc->pad_len) {
3448 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3449 struct scatterlist *psg = &qc->pad_sgent;
3450 unsigned int offset;
3451
Tejun Heoa46314742006-02-11 19:11:13 +09003452 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003453
3454 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3455
3456 /*
3457 * psg->page/offset are used to copy to-be-written
3458 * data in this function or read data in ata_sg_clean.
3459 */
3460 offset = lsg->offset + lsg->length - qc->pad_len;
3461 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3462 psg->offset = offset_in_page(offset);
3463
3464 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3465 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3466 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003467 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003468 }
3469
3470 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3471 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3472 /* trim last sg */
3473 lsg->length -= qc->pad_len;
Jeff Garzike1410f22005-11-14 14:06:26 -05003474 if (lsg->length == 0)
3475 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003476
3477 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3478 qc->n_elem - 1, lsg->length, qc->pad_len);
3479 }
3480
Jeff Garzike1410f22005-11-14 14:06:26 -05003481 pre_n_elem = qc->n_elem;
3482 if (trim_sg && pre_n_elem)
3483 pre_n_elem--;
3484
3485 if (!pre_n_elem) {
3486 n_elem = 0;
3487 goto skip_map;
3488 }
3489
Linus Torvalds1da177e2005-04-16 15:20:36 -07003490 dir = qc->dma_dir;
Brian King2f1f6102006-03-23 17:30:15 -06003491 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003492 if (n_elem < 1) {
3493 /* restore last sg */
3494 lsg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003495 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497
3498 DPRINTK("%d sg elements mapped\n", n_elem);
3499
Jeff Garzike1410f22005-11-14 14:06:26 -05003500skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003501 qc->n_elem = n_elem;
3502
3503 return 0;
3504}
3505
3506/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003507 * swap_buf_le16 - swap halves of 16-bit words in place
Edward Falk0baab862005-06-02 18:17:13 -04003508 * @buf: Buffer to swap
3509 * @buf_words: Number of 16-bit words in buffer.
3510 *
3511 * Swap halves of 16-bit words if needed to convert from
3512 * little-endian byte order to native cpu byte order, or
3513 * vice-versa.
3514 *
3515 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003516 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04003517 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003518void swap_buf_le16(u16 *buf, unsigned int buf_words)
3519{
3520#ifdef __BIG_ENDIAN
3521 unsigned int i;
3522
3523 for (i = 0; i < buf_words; i++)
3524 buf[i] = le16_to_cpu(buf[i]);
3525#endif /* __BIG_ENDIAN */
3526}
3527
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003528/**
3529 * ata_mmio_data_xfer - Transfer data by MMIO
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003530 * @dev: device for this I/O
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003531 * @buf: data buffer
3532 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003533 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003534 *
3535 * Transfer data from/to the device data register by MMIO.
3536 *
3537 * LOCKING:
3538 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003539 */
3540
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003541void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
3542 unsigned int buflen, int write_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003543{
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003544 struct ata_port *ap = adev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003545 unsigned int i;
3546 unsigned int words = buflen >> 1;
3547 u16 *buf16 = (u16 *) buf;
3548 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3549
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003550 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003551 if (write_data) {
3552 for (i = 0; i < words; i++)
3553 writew(le16_to_cpu(buf16[i]), mmio);
3554 } else {
3555 for (i = 0; i < words; i++)
3556 buf16[i] = cpu_to_le16(readw(mmio));
3557 }
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003558
3559 /* Transfer trailing 1 byte, if any. */
3560 if (unlikely(buflen & 0x01)) {
3561 u16 align_buf[1] = { 0 };
3562 unsigned char *trailing_buf = buf + buflen - 1;
3563
3564 if (write_data) {
3565 memcpy(align_buf, trailing_buf, 1);
3566 writew(le16_to_cpu(align_buf[0]), mmio);
3567 } else {
3568 align_buf[0] = cpu_to_le16(readw(mmio));
3569 memcpy(trailing_buf, align_buf, 1);
3570 }
3571 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003572}
3573
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003574/**
3575 * ata_pio_data_xfer - Transfer data by PIO
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003576 * @adev: device to target
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003577 * @buf: data buffer
3578 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003579 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003580 *
3581 * Transfer data from/to the device data register by PIO.
3582 *
3583 * LOCKING:
3584 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003585 */
3586
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003587void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
3588 unsigned int buflen, int write_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589{
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003590 struct ata_port *ap = adev->ap;
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003591 unsigned int words = buflen >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003592
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003593 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003594 if (write_data)
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003595 outsw(ap->ioaddr.data_addr, buf, words);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596 else
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003597 insw(ap->ioaddr.data_addr, buf, words);
3598
3599 /* Transfer trailing 1 byte, if any. */
3600 if (unlikely(buflen & 0x01)) {
3601 u16 align_buf[1] = { 0 };
3602 unsigned char *trailing_buf = buf + buflen - 1;
3603
3604 if (write_data) {
3605 memcpy(align_buf, trailing_buf, 1);
3606 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3607 } else {
3608 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3609 memcpy(trailing_buf, align_buf, 1);
3610 }
3611 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003612}
3613
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003614/**
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003615 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3616 * @qc: Command on going
3617 *
3618 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3619 *
3620 * LOCKING:
3621 * Inherited from caller.
3622 */
3623
Linus Torvalds1da177e2005-04-16 15:20:36 -07003624static void ata_pio_sector(struct ata_queued_cmd *qc)
3625{
3626 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003627 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003628 struct ata_port *ap = qc->ap;
3629 struct page *page;
3630 unsigned int offset;
3631 unsigned char *buf;
3632
3633 if (qc->cursect == (qc->nsect - 1))
Albert Lee14be71f2005-09-27 17:36:35 +08003634 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003635
3636 page = sg[qc->cursg].page;
3637 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3638
3639 /* get the current page and offset */
3640 page = nth_page(page, (offset >> PAGE_SHIFT));
3641 offset %= PAGE_SIZE;
3642
Albert Lee7282aa42005-10-09 09:46:07 -04003643 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3644
Albert Lee91b8b312005-10-09 09:48:44 -04003645 if (PageHighMem(page)) {
3646 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04003647
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003648 /* FIXME: use a bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04003649 local_irq_save(flags);
3650 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04003651
Albert Lee91b8b312005-10-09 09:48:44 -04003652 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003653 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003654
3655 kunmap_atomic(buf, KM_IRQ0);
3656 local_irq_restore(flags);
3657 } else {
3658 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003659 ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003661
3662 qc->cursect++;
3663 qc->cursg_ofs++;
3664
Albert Lee32529e02005-05-26 03:49:42 -04003665 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 qc->cursg++;
3667 qc->cursg_ofs = 0;
3668 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003670
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003671/**
Albert Lee07f6f7d2005-11-01 19:33:20 +08003672 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3673 * @qc: Command on going
3674 *
Jeff Garzikc81e29b2006-05-24 01:49:12 -04003675 * Transfer one or many ATA_SECT_SIZE of data from/to the
Albert Lee07f6f7d2005-11-01 19:33:20 +08003676 * ATA device for the DRQ request.
3677 *
3678 * LOCKING:
3679 * Inherited from caller.
3680 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003681
Albert Lee07f6f7d2005-11-01 19:33:20 +08003682static void ata_pio_sectors(struct ata_queued_cmd *qc)
3683{
3684 if (is_multi_taskfile(&qc->tf)) {
3685 /* READ/WRITE MULTIPLE */
3686 unsigned int nsect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003687
Jeff Garzik587005d2006-02-11 18:17:32 -05003688 WARN_ON(qc->dev->multi_count == 0);
Albert Lee07f6f7d2005-11-01 19:33:20 +08003689
3690 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3691 while (nsect--)
3692 ata_pio_sector(qc);
3693 } else
3694 ata_pio_sector(qc);
3695}
3696
3697/**
Albert Leec71c1852005-10-04 06:03:45 -04003698 * atapi_send_cdb - Write CDB bytes to hardware
3699 * @ap: Port to which ATAPI device is attached.
3700 * @qc: Taskfile currently active
3701 *
3702 * When device has indicated its readiness to accept
3703 * a CDB, this function is called. Send the CDB.
3704 *
3705 * LOCKING:
3706 * caller.
3707 */
3708
3709static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3710{
3711 /* send SCSI cdb */
3712 DPRINTK("send cdb\n");
Jeff Garzikdb024d52006-02-13 00:23:57 -05003713 WARN_ON(qc->dev->cdb_len < 12);
Albert Leec71c1852005-10-04 06:03:45 -04003714
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003715 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
Albert Leec71c1852005-10-04 06:03:45 -04003716 ata_altstatus(ap); /* flush */
3717
3718 switch (qc->tf.protocol) {
3719 case ATA_PROT_ATAPI:
3720 ap->hsm_task_state = HSM_ST;
3721 break;
3722 case ATA_PROT_ATAPI_NODATA:
3723 ap->hsm_task_state = HSM_ST_LAST;
3724 break;
3725 case ATA_PROT_ATAPI_DMA:
3726 ap->hsm_task_state = HSM_ST_LAST;
3727 /* initiate bmdma */
3728 ap->ops->bmdma_start(qc);
3729 break;
3730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731}
3732
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003733/**
3734 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3735 * @qc: Command on going
3736 * @bytes: number of bytes
3737 *
3738 * Transfer Transfer data from/to the ATAPI device.
3739 *
3740 * LOCKING:
3741 * Inherited from caller.
3742 *
3743 */
3744
Linus Torvalds1da177e2005-04-16 15:20:36 -07003745static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3746{
3747 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003748 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003749 struct ata_port *ap = qc->ap;
3750 struct page *page;
3751 unsigned char *buf;
3752 unsigned int offset, count;
3753
Albert Lee563a6e12005-08-12 14:17:50 +08003754 if (qc->curbytes + bytes >= qc->nbytes)
Albert Lee14be71f2005-09-27 17:36:35 +08003755 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003756
3757next_sg:
Albert Lee563a6e12005-08-12 14:17:50 +08003758 if (unlikely(qc->cursg >= qc->n_elem)) {
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003759 /*
Albert Lee563a6e12005-08-12 14:17:50 +08003760 * The end of qc->sg is reached and the device expects
3761 * more data to transfer. In order not to overrun qc->sg
3762 * and fulfill length specified in the byte count register,
3763 * - for read case, discard trailing data from the device
3764 * - for write case, padding zero data to the device
3765 */
3766 u16 pad_buf[1] = { 0 };
3767 unsigned int words = bytes >> 1;
3768 unsigned int i;
3769
3770 if (words) /* warning if bytes > 1 */
Tejun Heof15a1da2006-05-15 20:57:56 +09003771 ata_dev_printk(qc->dev, KERN_WARNING,
3772 "%u bytes trailing data\n", bytes);
Albert Lee563a6e12005-08-12 14:17:50 +08003773
3774 for (i = 0; i < words; i++)
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003775 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
Albert Lee563a6e12005-08-12 14:17:50 +08003776
Albert Lee14be71f2005-09-27 17:36:35 +08003777 ap->hsm_task_state = HSM_ST_LAST;
Albert Lee563a6e12005-08-12 14:17:50 +08003778 return;
3779 }
3780
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003781 sg = &qc->__sg[qc->cursg];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782
Linus Torvalds1da177e2005-04-16 15:20:36 -07003783 page = sg->page;
3784 offset = sg->offset + qc->cursg_ofs;
3785
3786 /* get the current page and offset */
3787 page = nth_page(page, (offset >> PAGE_SHIFT));
3788 offset %= PAGE_SIZE;
3789
Albert Lee6952df02005-06-06 15:56:03 +08003790 /* don't overrun current sg */
Albert Lee32529e02005-05-26 03:49:42 -04003791 count = min(sg->length - qc->cursg_ofs, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003792
3793 /* don't cross page boundaries */
3794 count = min(count, (unsigned int)PAGE_SIZE - offset);
3795
Albert Lee7282aa42005-10-09 09:46:07 -04003796 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3797
Albert Lee91b8b312005-10-09 09:48:44 -04003798 if (PageHighMem(page)) {
3799 unsigned long flags;
Albert Lee7282aa42005-10-09 09:46:07 -04003800
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003801 /* FIXME: use bounce buffer */
Albert Lee91b8b312005-10-09 09:48:44 -04003802 local_irq_save(flags);
3803 buf = kmap_atomic(page, KM_IRQ0);
Albert Lee083958d2005-10-09 09:47:31 -04003804
Albert Lee91b8b312005-10-09 09:48:44 -04003805 /* do the actual data transfer */
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003806 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003807
3808 kunmap_atomic(buf, KM_IRQ0);
3809 local_irq_restore(flags);
3810 } else {
3811 buf = page_address(page);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01003812 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
Albert Lee91b8b312005-10-09 09:48:44 -04003813 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003814
3815 bytes -= count;
3816 qc->curbytes += count;
3817 qc->cursg_ofs += count;
3818
Albert Lee32529e02005-05-26 03:49:42 -04003819 if (qc->cursg_ofs == sg->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003820 qc->cursg++;
3821 qc->cursg_ofs = 0;
3822 }
3823
Albert Lee563a6e12005-08-12 14:17:50 +08003824 if (bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003825 goto next_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003826}
3827
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003828/**
3829 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3830 * @qc: Command on going
3831 *
3832 * Transfer Transfer data from/to the ATAPI device.
3833 *
3834 * LOCKING:
3835 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003836 */
3837
Linus Torvalds1da177e2005-04-16 15:20:36 -07003838static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3839{
3840 struct ata_port *ap = qc->ap;
3841 struct ata_device *dev = qc->dev;
3842 unsigned int ireason, bc_lo, bc_hi, bytes;
3843 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3844
Albert Leeeec4c3f2006-05-18 17:51:10 +08003845 /* Abuse qc->result_tf for temp storage of intermediate TF
3846 * here to save some kernel stack usage.
3847 * For normal completion, qc->result_tf is not relevant. For
3848 * error, qc->result_tf is later overwritten by ata_qc_complete().
3849 * So, the correctness of qc->result_tf is not affected.
3850 */
3851 ap->ops->tf_read(ap, &qc->result_tf);
3852 ireason = qc->result_tf.nsect;
3853 bc_lo = qc->result_tf.lbam;
3854 bc_hi = qc->result_tf.lbah;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 bytes = (bc_hi << 8) | bc_lo;
3856
3857 /* shall be cleared to zero, indicating xfer of data */
3858 if (ireason & (1 << 0))
3859 goto err_out;
3860
3861 /* make sure transfer direction matches expected */
3862 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3863 if (do_write != i_write)
3864 goto err_out;
3865
Albert Lee312f7da2005-09-27 17:38:03 +08003866 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3867
Linus Torvalds1da177e2005-04-16 15:20:36 -07003868 __atapi_pio_bytes(qc, bytes);
3869
3870 return;
3871
3872err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09003873 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
Tejun Heo11a56d22006-01-23 13:09:36 +09003874 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08003875 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003876}
3877
3878/**
Albert Leec234fb02006-03-25 17:58:38 +08003879 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3880 * @ap: the target ata_port
3881 * @qc: qc on going
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882 *
Albert Leec234fb02006-03-25 17:58:38 +08003883 * RETURNS:
3884 * 1 if ok in workqueue, 0 otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003885 */
Albert Leec234fb02006-03-25 17:58:38 +08003886
3887static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003888{
Albert Leec234fb02006-03-25 17:58:38 +08003889 if (qc->tf.flags & ATA_TFLAG_POLLING)
3890 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891
Albert Leec234fb02006-03-25 17:58:38 +08003892 if (ap->hsm_task_state == HSM_ST_FIRST) {
3893 if (qc->tf.protocol == ATA_PROT_PIO &&
3894 (qc->tf.flags & ATA_TFLAG_WRITE))
3895 return 1;
3896
3897 if (is_atapi_taskfile(&qc->tf) &&
3898 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
3899 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003900 }
3901
Albert Leec234fb02006-03-25 17:58:38 +08003902 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003903}
3904
Albert Leec234fb02006-03-25 17:58:38 +08003905/**
Tejun Heoc17ea202006-05-15 20:59:29 +09003906 * ata_hsm_qc_complete - finish a qc running on standard HSM
3907 * @qc: Command to complete
3908 * @in_wq: 1 if called from workqueue, 0 otherwise
3909 *
3910 * Finish @qc which is running on standard HSM.
3911 *
3912 * LOCKING:
3913 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3914 * Otherwise, none on entry and grabs host lock.
3915 */
3916static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
3917{
3918 struct ata_port *ap = qc->ap;
3919 unsigned long flags;
3920
3921 if (ap->ops->error_handler) {
3922 if (in_wq) {
3923 spin_lock_irqsave(&ap->host_set->lock, flags);
3924
3925 /* EH might have kicked in while host_set lock
3926 * is released.
3927 */
3928 qc = ata_qc_from_tag(ap, qc->tag);
3929 if (qc) {
3930 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
3931 ata_irq_on(ap);
3932 ata_qc_complete(qc);
3933 } else
3934 ata_port_freeze(ap);
3935 }
3936
3937 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3938 } else {
3939 if (likely(!(qc->err_mask & AC_ERR_HSM)))
3940 ata_qc_complete(qc);
3941 else
3942 ata_port_freeze(ap);
3943 }
3944 } else {
3945 if (in_wq) {
3946 spin_lock_irqsave(&ap->host_set->lock, flags);
3947 ata_irq_on(ap);
3948 ata_qc_complete(qc);
3949 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3950 } else
3951 ata_qc_complete(qc);
3952 }
Jeff Garzikc81e29b2006-05-24 01:49:12 -04003953
3954 ata_altstatus(ap); /* flush */
Tejun Heoc17ea202006-05-15 20:59:29 +09003955}
3956
3957/**
Albert Leebb5cb292006-03-25 17:48:02 +08003958 * ata_hsm_move - move the HSM to the next state.
3959 * @ap: the target ata_port
3960 * @qc: qc on going
3961 * @status: current device status
3962 * @in_wq: 1 if called from workqueue, 0 otherwise
3963 *
3964 * RETURNS:
3965 * 1 when poll next status needed, 0 otherwise.
3966 */
3967
3968static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
3969 u8 status, int in_wq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003970{
Albert Leebb5cb292006-03-25 17:48:02 +08003971 unsigned long flags = 0;
3972 int poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973
Albert Lee6912ccd2006-03-25 17:45:49 +08003974 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
Albert Lee0565c262006-02-13 18:55:25 +08003975
Albert Leebb5cb292006-03-25 17:48:02 +08003976 /* Make sure ata_qc_issue_prot() does not throw things
3977 * like DMA polling into the workqueue. Notice that
3978 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
Albert Lee1c848982005-12-05 15:40:15 +08003979 */
Albert Leec234fb02006-03-25 17:58:38 +08003980 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
Albert Lee1c848982005-12-05 15:40:15 +08003981
Albert Leee2cec772006-03-25 17:43:49 +08003982fsm_start:
Albert Lee999bb6f2006-03-25 18:07:48 +08003983 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3984 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003985
Albert Leee2cec772006-03-25 17:43:49 +08003986 switch (ap->hsm_task_state) {
3987 case HSM_ST_FIRST:
Albert Leebb5cb292006-03-25 17:48:02 +08003988 /* Send first data block or PACKET CDB */
3989
3990 /* If polling, we will stay in the work queue after
3991 * sending the data. Otherwise, interrupt handler
3992 * takes over after sending the data.
3993 */
3994 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
3995
Albert Leee2cec772006-03-25 17:43:49 +08003996 /* check device status */
Albert Lee3655d1d2006-05-19 11:43:04 +08003997 if (unlikely((status & ATA_DRQ) == 0)) {
3998 /* handle BSY=0, DRQ=0 as error */
3999 if (likely(status & (ATA_ERR | ATA_DF)))
4000 /* device stops HSM for abort/error */
4001 qc->err_mask |= AC_ERR_DEV;
4002 else
4003 /* HSM violation. Let EH handle this */
4004 qc->err_mask |= AC_ERR_HSM;
4005
Albert Leee2cec772006-03-25 17:43:49 +08004006 ap->hsm_task_state = HSM_ST_ERR;
4007 goto fsm_start;
4008 }
4009
Albert Lee71601952006-03-25 18:11:12 +08004010 /* Device should not ask for data transfer (DRQ=1)
4011 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004012 * We ignore DRQ here and stop the HSM by
4013 * changing hsm_task_state to HSM_ST_ERR and
4014 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004015 */
4016 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4017 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4018 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004019 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004020 ap->hsm_task_state = HSM_ST_ERR;
4021 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004022 }
4023
Albert Leebb5cb292006-03-25 17:48:02 +08004024 /* Send the CDB (atapi) or the first data block (ata pio out).
4025 * During the state transition, interrupt handler shouldn't
4026 * be invoked before the data transfer is complete and
4027 * hsm_task_state is changed. Hence, the following locking.
4028 */
4029 if (in_wq)
4030 spin_lock_irqsave(&ap->host_set->lock, flags);
Albert Leee2cec772006-03-25 17:43:49 +08004031
Albert Leebb5cb292006-03-25 17:48:02 +08004032 if (qc->tf.protocol == ATA_PROT_PIO) {
4033 /* PIO data out protocol.
4034 * send first data block.
4035 */
4036
4037 /* ata_pio_sectors() might change the state
4038 * to HSM_ST_LAST. so, the state is changed here
4039 * before ata_pio_sectors().
4040 */
4041 ap->hsm_task_state = HSM_ST;
4042 ata_pio_sectors(qc);
4043 ata_altstatus(ap); /* flush */
4044 } else
4045 /* send CDB */
4046 atapi_send_cdb(ap, qc);
4047
4048 if (in_wq)
4049 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4050
4051 /* if polling, ata_pio_task() handles the rest.
4052 * otherwise, interrupt handler takes over from here.
4053 */
Albert Leee2cec772006-03-25 17:43:49 +08004054 break;
4055
4056 case HSM_ST:
4057 /* complete command or read/write the data register */
4058 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4059 /* ATAPI PIO protocol */
4060 if ((status & ATA_DRQ) == 0) {
Albert Lee3655d1d2006-05-19 11:43:04 +08004061 /* No more data to transfer or device error.
4062 * Device error will be tagged in HSM_ST_LAST.
4063 */
Albert Leee2cec772006-03-25 17:43:49 +08004064 ap->hsm_task_state = HSM_ST_LAST;
4065 goto fsm_start;
4066 }
4067
Albert Lee71601952006-03-25 18:11:12 +08004068 /* Device should not ask for data transfer (DRQ=1)
4069 * when it finds something wrong.
Albert Leeeee6c322006-04-01 17:38:43 +08004070 * We ignore DRQ here and stop the HSM by
4071 * changing hsm_task_state to HSM_ST_ERR and
4072 * let the EH abort the command or reset the device.
Albert Lee71601952006-03-25 18:11:12 +08004073 */
4074 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4075 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4076 ap->id, status);
Albert Lee3655d1d2006-05-19 11:43:04 +08004077 qc->err_mask |= AC_ERR_HSM;
Albert Leeeee6c322006-04-01 17:38:43 +08004078 ap->hsm_task_state = HSM_ST_ERR;
4079 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004080 }
4081
Albert Leee2cec772006-03-25 17:43:49 +08004082 atapi_pio_bytes(qc);
4083
4084 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4085 /* bad ireason reported by device */
4086 goto fsm_start;
4087
4088 } else {
4089 /* ATA PIO protocol */
4090 if (unlikely((status & ATA_DRQ) == 0)) {
4091 /* handle BSY=0, DRQ=0 as error */
Albert Lee3655d1d2006-05-19 11:43:04 +08004092 if (likely(status & (ATA_ERR | ATA_DF)))
4093 /* device stops HSM for abort/error */
4094 qc->err_mask |= AC_ERR_DEV;
4095 else
4096 /* HSM violation. Let EH handle this */
4097 qc->err_mask |= AC_ERR_HSM;
4098
Albert Leee2cec772006-03-25 17:43:49 +08004099 ap->hsm_task_state = HSM_ST_ERR;
4100 goto fsm_start;
4101 }
4102
Albert Leeeee6c322006-04-01 17:38:43 +08004103 /* For PIO reads, some devices may ask for
4104 * data transfer (DRQ=1) alone with ERR=1.
4105 * We respect DRQ here and transfer one
4106 * block of junk data before changing the
4107 * hsm_task_state to HSM_ST_ERR.
4108 *
4109 * For PIO writes, ERR=1 DRQ=1 doesn't make
4110 * sense since the data block has been
4111 * transferred to the device.
Albert Lee71601952006-03-25 18:11:12 +08004112 */
4113 if (unlikely(status & (ATA_ERR | ATA_DF))) {
Albert Lee71601952006-03-25 18:11:12 +08004114 /* data might be corrputed */
4115 qc->err_mask |= AC_ERR_DEV;
Albert Leeeee6c322006-04-01 17:38:43 +08004116
4117 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
4118 ata_pio_sectors(qc);
4119 ata_altstatus(ap);
4120 status = ata_wait_idle(ap);
4121 }
4122
Albert Lee3655d1d2006-05-19 11:43:04 +08004123 if (status & (ATA_BUSY | ATA_DRQ))
4124 qc->err_mask |= AC_ERR_HSM;
4125
Albert Leeeee6c322006-04-01 17:38:43 +08004126 /* ata_pio_sectors() might change the
4127 * state to HSM_ST_LAST. so, the state
4128 * is changed after ata_pio_sectors().
4129 */
4130 ap->hsm_task_state = HSM_ST_ERR;
4131 goto fsm_start;
Albert Lee71601952006-03-25 18:11:12 +08004132 }
4133
Albert Leee2cec772006-03-25 17:43:49 +08004134 ata_pio_sectors(qc);
4135
4136 if (ap->hsm_task_state == HSM_ST_LAST &&
4137 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4138 /* all data read */
4139 ata_altstatus(ap);
Albert Lee52a32202006-03-25 18:18:15 +08004140 status = ata_wait_idle(ap);
Albert Leee2cec772006-03-25 17:43:49 +08004141 goto fsm_start;
4142 }
4143 }
4144
4145 ata_altstatus(ap); /* flush */
Albert Leebb5cb292006-03-25 17:48:02 +08004146 poll_next = 1;
Albert Leee2cec772006-03-25 17:43:49 +08004147 break;
4148
4149 case HSM_ST_LAST:
Albert Lee6912ccd2006-03-25 17:45:49 +08004150 if (unlikely(!ata_ok(status))) {
4151 qc->err_mask |= __ac_err_mask(status);
Albert Leee2cec772006-03-25 17:43:49 +08004152 ap->hsm_task_state = HSM_ST_ERR;
4153 goto fsm_start;
4154 }
4155
4156 /* no more data to transfer */
Albert Lee4332a772006-04-03 17:43:24 +08004157 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4158 ap->id, qc->dev->devno, status);
Albert Leee2cec772006-03-25 17:43:49 +08004159
Albert Lee6912ccd2006-03-25 17:45:49 +08004160 WARN_ON(qc->err_mask);
4161
Albert Leee2cec772006-03-25 17:43:49 +08004162 ap->hsm_task_state = HSM_ST_IDLE;
4163
4164 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004165 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004166
4167 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004168 break;
4169
4170 case HSM_ST_ERR:
Albert Leee2cec772006-03-25 17:43:49 +08004171 /* make sure qc->err_mask is available to
4172 * know what's wrong and recover
4173 */
4174 WARN_ON(qc->err_mask == 0);
4175
4176 ap->hsm_task_state = HSM_ST_IDLE;
Albert Leebb5cb292006-03-25 17:48:02 +08004177
Albert Lee999bb6f2006-03-25 18:07:48 +08004178 /* complete taskfile transaction */
Tejun Heoc17ea202006-05-15 20:59:29 +09004179 ata_hsm_qc_complete(qc, in_wq);
Albert Leebb5cb292006-03-25 17:48:02 +08004180
4181 poll_next = 0;
Albert Leee2cec772006-03-25 17:43:49 +08004182 break;
4183 default:
Albert Leebb5cb292006-03-25 17:48:02 +08004184 poll_next = 0;
Albert Lee6912ccd2006-03-25 17:45:49 +08004185 BUG();
Albert Leee2cec772006-03-25 17:43:49 +08004186 }
4187
Albert Leebb5cb292006-03-25 17:48:02 +08004188 return poll_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004189}
4190
4191static void ata_pio_task(void *_data)
4192{
Tejun Heoc91af2c2006-04-02 18:51:53 +09004193 struct ata_queued_cmd *qc = _data;
4194 struct ata_port *ap = qc->ap;
Albert Leea1af3732006-03-25 17:50:15 +08004195 u8 status;
4196 int poll_next;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004197
4198fsm_start:
Albert Leea1af3732006-03-25 17:50:15 +08004199 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004200
Albert Leea1af3732006-03-25 17:50:15 +08004201 /*
4202 * This is purely heuristic. This is a fast path.
4203 * Sometimes when we enter, BSY will be cleared in
4204 * a chk-status or two. If not, the drive is probably seeking
4205 * or something. Snooze for a couple msecs, then
4206 * chk-status again. If still busy, queue delayed work.
4207 */
4208 status = ata_busy_wait(ap, ATA_BUSY, 5);
4209 if (status & ATA_BUSY) {
4210 msleep(2);
4211 status = ata_busy_wait(ap, ATA_BUSY, 10);
4212 if (status & ATA_BUSY) {
Albert Lee31ce6da2006-04-03 18:31:44 +08004213 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
Albert Leea1af3732006-03-25 17:50:15 +08004214 return;
4215 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004216 }
4217
Albert Leea1af3732006-03-25 17:50:15 +08004218 /* move the HSM */
4219 poll_next = ata_hsm_move(ap, qc, status, 1);
4220
4221 /* another command or interrupt handler
4222 * may be running at this point.
4223 */
4224 if (poll_next)
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04004225 goto fsm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004226}
4227
Linus Torvalds1da177e2005-04-16 15:20:36 -07004228/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004229 * ata_qc_new - Request an available ATA command, for queueing
4230 * @ap: Port associated with device @dev
4231 * @dev: Device from whom we request an available command structure
4232 *
4233 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004234 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004235 */
4236
4237static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4238{
4239 struct ata_queued_cmd *qc = NULL;
4240 unsigned int i;
4241
Tejun Heoe3180492006-05-15 20:58:09 +09004242 /* no command while frozen */
4243 if (unlikely(ap->flags & ATA_FLAG_FROZEN))
4244 return NULL;
4245
Tejun Heo2ab7db12006-05-15 20:58:02 +09004246 /* the last tag is reserved for internal command. */
4247 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
Tejun Heo6cec4a32006-05-15 21:03:41 +09004248 if (!test_and_set_bit(i, &ap->qc_allocated)) {
Tejun Heof69499f2006-05-15 20:58:03 +09004249 qc = __ata_qc_from_tag(ap, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004250 break;
4251 }
4252
4253 if (qc)
4254 qc->tag = i;
4255
4256 return qc;
4257}
4258
4259/**
4260 * ata_qc_new_init - Request an available ATA command, and initialize it
Linus Torvalds1da177e2005-04-16 15:20:36 -07004261 * @dev: Device from whom we request an available command structure
4262 *
4263 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004264 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004265 */
4266
Tejun Heo3373efd2006-05-15 20:57:53 +09004267struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004268{
Tejun Heo3373efd2006-05-15 20:57:53 +09004269 struct ata_port *ap = dev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004270 struct ata_queued_cmd *qc;
4271
4272 qc = ata_qc_new(ap);
4273 if (qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004274 qc->scsicmd = NULL;
4275 qc->ap = ap;
4276 qc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004277
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05004278 ata_qc_reinit(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004279 }
4280
4281 return qc;
4282}
4283
Linus Torvalds1da177e2005-04-16 15:20:36 -07004284/**
4285 * ata_qc_free - free unused ata_queued_cmd
4286 * @qc: Command to complete
4287 *
4288 * Designed to free unused ata_queued_cmd object
4289 * in case something prevents using it.
4290 *
4291 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004292 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004293 */
4294void ata_qc_free(struct ata_queued_cmd *qc)
4295{
Tejun Heo4ba946e2006-01-23 13:09:36 +09004296 struct ata_port *ap = qc->ap;
4297 unsigned int tag;
4298
Tejun Heoa46314742006-02-11 19:11:13 +09004299 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004300
Tejun Heo4ba946e2006-01-23 13:09:36 +09004301 qc->flags = 0;
4302 tag = qc->tag;
4303 if (likely(ata_tag_valid(tag))) {
Tejun Heo4ba946e2006-01-23 13:09:36 +09004304 qc->tag = ATA_TAG_POISON;
Tejun Heo6cec4a32006-05-15 21:03:41 +09004305 clear_bit(tag, &ap->qc_allocated);
Tejun Heo4ba946e2006-01-23 13:09:36 +09004306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004307}
4308
Tejun Heo76014422006-02-11 15:13:49 +09004309void __ata_qc_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004310{
Tejun Heodedaf2b2006-05-15 21:03:43 +09004311 struct ata_port *ap = qc->ap;
4312
Tejun Heoa46314742006-02-11 19:11:13 +09004313 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4314 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004315
4316 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4317 ata_sg_clean(qc);
4318
Tejun Heo7401abf2006-05-15 20:57:32 +09004319 /* command should be marked inactive atomically with qc completion */
Tejun Heodedaf2b2006-05-15 21:03:43 +09004320 if (qc->tf.protocol == ATA_PROT_NCQ)
4321 ap->sactive &= ~(1 << qc->tag);
4322 else
4323 ap->active_tag = ATA_TAG_POISON;
Tejun Heo7401abf2006-05-15 20:57:32 +09004324
Albert Lee3f3791d2005-08-16 14:25:38 +08004325 /* atapi: mark qc as inactive to prevent the interrupt handler
4326 * from completing the command twice later, before the error handler
4327 * is called. (when rc != 0 and atapi request sense is needed)
4328 */
4329 qc->flags &= ~ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004330 ap->qc_active &= ~(1 << qc->tag);
Albert Lee3f3791d2005-08-16 14:25:38 +08004331
Linus Torvalds1da177e2005-04-16 15:20:36 -07004332 /* call completion callback */
Tejun Heo77853bf2006-01-23 13:09:36 +09004333 qc->complete_fn(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004334}
4335
Tejun Heof686bcb2006-05-15 20:58:05 +09004336/**
4337 * ata_qc_complete - Complete an active ATA command
4338 * @qc: Command to complete
4339 * @err_mask: ATA Status register contents
4340 *
4341 * Indicate to the mid and upper layers that an ATA
4342 * command has completed, with either an ok or not-ok status.
4343 *
4344 * LOCKING:
4345 * spin_lock_irqsave(host_set lock)
4346 */
4347void ata_qc_complete(struct ata_queued_cmd *qc)
4348{
4349 struct ata_port *ap = qc->ap;
4350
4351 /* XXX: New EH and old EH use different mechanisms to
4352 * synchronize EH with regular execution path.
4353 *
4354 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4355 * Normal execution path is responsible for not accessing a
4356 * failed qc. libata core enforces the rule by returning NULL
4357 * from ata_qc_from_tag() for failed qcs.
4358 *
4359 * Old EH depends on ata_qc_complete() nullifying completion
4360 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4361 * not synchronize with interrupt handler. Only PIO task is
4362 * taken care of.
4363 */
4364 if (ap->ops->error_handler) {
4365 WARN_ON(ap->flags & ATA_FLAG_FROZEN);
4366
4367 if (unlikely(qc->err_mask))
4368 qc->flags |= ATA_QCFLAG_FAILED;
4369
4370 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4371 if (!ata_tag_internal(qc->tag)) {
4372 /* always fill result TF for failed qc */
4373 ap->ops->tf_read(ap, &qc->result_tf);
4374 ata_qc_schedule_eh(qc);
4375 return;
4376 }
4377 }
4378
4379 /* read result TF if requested */
4380 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4381 ap->ops->tf_read(ap, &qc->result_tf);
4382
4383 __ata_qc_complete(qc);
4384 } else {
4385 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4386 return;
4387
4388 /* read result TF if failed or requested */
4389 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4390 ap->ops->tf_read(ap, &qc->result_tf);
4391
4392 __ata_qc_complete(qc);
4393 }
4394}
4395
Tejun Heodedaf2b2006-05-15 21:03:43 +09004396/**
4397 * ata_qc_complete_multiple - Complete multiple qcs successfully
4398 * @ap: port in question
4399 * @qc_active: new qc_active mask
4400 * @finish_qc: LLDD callback invoked before completing a qc
4401 *
4402 * Complete in-flight commands. This functions is meant to be
4403 * called from low-level driver's interrupt routine to complete
4404 * requests normally. ap->qc_active and @qc_active is compared
4405 * and commands are completed accordingly.
4406 *
4407 * LOCKING:
4408 * spin_lock_irqsave(host_set lock)
4409 *
4410 * RETURNS:
4411 * Number of completed commands on success, -errno otherwise.
4412 */
4413int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
4414 void (*finish_qc)(struct ata_queued_cmd *))
4415{
4416 int nr_done = 0;
4417 u32 done_mask;
4418 int i;
4419
4420 done_mask = ap->qc_active ^ qc_active;
4421
4422 if (unlikely(done_mask & qc_active)) {
4423 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4424 "(%08x->%08x)\n", ap->qc_active, qc_active);
4425 return -EINVAL;
4426 }
4427
4428 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4429 struct ata_queued_cmd *qc;
4430
4431 if (!(done_mask & (1 << i)))
4432 continue;
4433
4434 if ((qc = ata_qc_from_tag(ap, i))) {
4435 if (finish_qc)
4436 finish_qc(qc);
4437 ata_qc_complete(qc);
4438 nr_done++;
4439 }
4440 }
4441
4442 return nr_done;
4443}
4444
Linus Torvalds1da177e2005-04-16 15:20:36 -07004445static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4446{
4447 struct ata_port *ap = qc->ap;
4448
4449 switch (qc->tf.protocol) {
Tejun Heo3dc1d882006-05-15 21:03:45 +09004450 case ATA_PROT_NCQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004451 case ATA_PROT_DMA:
4452 case ATA_PROT_ATAPI_DMA:
4453 return 1;
4454
4455 case ATA_PROT_ATAPI:
4456 case ATA_PROT_PIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004457 if (ap->flags & ATA_FLAG_PIO_DMA)
4458 return 1;
4459
4460 /* fall through */
4461
4462 default:
4463 return 0;
4464 }
4465
4466 /* never reached */
4467}
4468
4469/**
4470 * ata_qc_issue - issue taskfile to device
4471 * @qc: command to issue to device
4472 *
4473 * Prepare an ATA command to submission to device.
4474 * This includes mapping the data into a DMA-able
4475 * area, filling in the S/G table, and finally
4476 * writing the taskfile to hardware, starting the command.
4477 *
4478 * LOCKING:
4479 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004480 */
Tejun Heo8e0e6942006-03-31 20:41:11 +09004481void ata_qc_issue(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004482{
4483 struct ata_port *ap = qc->ap;
4484
Tejun Heodedaf2b2006-05-15 21:03:43 +09004485 /* Make sure only one non-NCQ command is outstanding. The
4486 * check is skipped for old EH because it reuses active qc to
4487 * request ATAPI sense.
4488 */
4489 WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
4490
4491 if (qc->tf.protocol == ATA_PROT_NCQ) {
4492 WARN_ON(ap->sactive & (1 << qc->tag));
4493 ap->sactive |= 1 << qc->tag;
4494 } else {
4495 WARN_ON(ap->sactive);
4496 ap->active_tag = qc->tag;
4497 }
4498
Tejun Heoe4a70e72006-03-31 20:36:47 +09004499 qc->flags |= ATA_QCFLAG_ACTIVE;
Tejun Heodedaf2b2006-05-15 21:03:43 +09004500 ap->qc_active |= 1 << qc->tag;
Tejun Heoe4a70e72006-03-31 20:36:47 +09004501
Linus Torvalds1da177e2005-04-16 15:20:36 -07004502 if (ata_should_dma_map(qc)) {
4503 if (qc->flags & ATA_QCFLAG_SG) {
4504 if (ata_sg_setup(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004505 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004506 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4507 if (ata_sg_setup_one(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004508 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004509 }
4510 } else {
4511 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4512 }
4513
4514 ap->ops->qc_prep(qc);
4515
Tejun Heo8e0e6942006-03-31 20:41:11 +09004516 qc->err_mask |= ap->ops->qc_issue(qc);
4517 if (unlikely(qc->err_mask))
4518 goto err;
4519 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004520
Tejun Heo8e436af2006-01-23 13:09:36 +09004521sg_err:
4522 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Tejun Heo8e0e6942006-03-31 20:41:11 +09004523 qc->err_mask |= AC_ERR_SYSTEM;
4524err:
4525 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004526}
4527
4528/**
4529 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4530 * @qc: command to issue to device
4531 *
4532 * Using various libata functions and hooks, this function
4533 * starts an ATA command. ATA commands are grouped into
4534 * classes called "protocols", and issuing each type of protocol
4535 * is slightly different.
4536 *
Edward Falk0baab862005-06-02 18:17:13 -04004537 * May be used as the qc_issue() entry in ata_port_operations.
4538 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004539 * LOCKING:
4540 * spin_lock_irqsave(host_set lock)
4541 *
4542 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004543 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004544 */
4545
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004546unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004547{
4548 struct ata_port *ap = qc->ap;
4549
Albert Leee50362e2005-09-27 17:39:50 +08004550 /* Use polling pio if the LLD doesn't handle
4551 * interrupt driven pio and atapi CDB interrupt.
4552 */
4553 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4554 switch (qc->tf.protocol) {
4555 case ATA_PROT_PIO:
4556 case ATA_PROT_ATAPI:
4557 case ATA_PROT_ATAPI_NODATA:
4558 qc->tf.flags |= ATA_TFLAG_POLLING;
4559 break;
4560 case ATA_PROT_ATAPI_DMA:
4561 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
Albert Leec2bbc552006-03-25 17:56:55 +08004562 /* see ata_check_atapi_dma() */
Albert Leee50362e2005-09-27 17:39:50 +08004563 BUG();
4564 break;
4565 default:
4566 break;
4567 }
4568 }
4569
Albert Lee312f7da2005-09-27 17:38:03 +08004570 /* select the device */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004571 ata_dev_select(ap, qc->dev->devno, 1, 0);
4572
Albert Lee312f7da2005-09-27 17:38:03 +08004573 /* start the command */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004574 switch (qc->tf.protocol) {
4575 case ATA_PROT_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08004576 if (qc->tf.flags & ATA_TFLAG_POLLING)
4577 ata_qc_set_polling(qc);
4578
Jeff Garzike5338252005-10-30 21:37:17 -05004579 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08004580 ap->hsm_task_state = HSM_ST_LAST;
4581
4582 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08004583 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08004584
Linus Torvalds1da177e2005-04-16 15:20:36 -07004585 break;
4586
4587 case ATA_PROT_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05004588 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08004589
Linus Torvalds1da177e2005-04-16 15:20:36 -07004590 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4591 ap->ops->bmdma_setup(qc); /* set up bmdma */
4592 ap->ops->bmdma_start(qc); /* initiate bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08004593 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004594 break;
4595
Albert Lee312f7da2005-09-27 17:38:03 +08004596 case ATA_PROT_PIO:
4597 if (qc->tf.flags & ATA_TFLAG_POLLING)
4598 ata_qc_set_polling(qc);
4599
Jeff Garzike5338252005-10-30 21:37:17 -05004600 ata_tf_to_host(ap, &qc->tf);
Albert Lee312f7da2005-09-27 17:38:03 +08004601
Albert Lee54f00382005-09-30 19:14:19 +08004602 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4603 /* PIO data out protocol */
4604 ap->hsm_task_state = HSM_ST_FIRST;
Albert Lee31ce6da2006-04-03 18:31:44 +08004605 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee54f00382005-09-30 19:14:19 +08004606
4607 /* always send first data block using
Albert Leee27486d2005-11-01 19:24:49 +08004608 * the ata_pio_task() codepath.
Albert Lee54f00382005-09-30 19:14:19 +08004609 */
Albert Lee312f7da2005-09-27 17:38:03 +08004610 } else {
Albert Lee54f00382005-09-30 19:14:19 +08004611 /* PIO data in protocol */
4612 ap->hsm_task_state = HSM_ST;
Albert Lee312f7da2005-09-27 17:38:03 +08004613
Albert Lee54f00382005-09-30 19:14:19 +08004614 if (qc->tf.flags & ATA_TFLAG_POLLING)
Albert Lee31ce6da2006-04-03 18:31:44 +08004615 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Albert Lee312f7da2005-09-27 17:38:03 +08004616
Albert Lee54f00382005-09-30 19:14:19 +08004617 /* if polling, ata_pio_task() handles the rest.
4618 * otherwise, interrupt handler takes over from here.
4619 */
Albert Lee312f7da2005-09-27 17:38:03 +08004620 }
4621
Linus Torvalds1da177e2005-04-16 15:20:36 -07004622 break;
4623
4624 case ATA_PROT_ATAPI:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004625 case ATA_PROT_ATAPI_NODATA:
Albert Lee312f7da2005-09-27 17:38:03 +08004626 if (qc->tf.flags & ATA_TFLAG_POLLING)
4627 ata_qc_set_polling(qc);
4628
Jeff Garzike5338252005-10-30 21:37:17 -05004629 ata_tf_to_host(ap, &qc->tf);
Jeff Garzikf6ef65e2006-01-27 02:45:00 -05004630
Albert Lee312f7da2005-09-27 17:38:03 +08004631 ap->hsm_task_state = HSM_ST_FIRST;
4632
4633 /* send cdb by polling if no cdb interrupt */
4634 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4635 (qc->tf.flags & ATA_TFLAG_POLLING))
Albert Lee31ce6da2006-04-03 18:31:44 +08004636 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004637 break;
4638
4639 case ATA_PROT_ATAPI_DMA:
Jeff Garzik587005d2006-02-11 18:17:32 -05004640 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
Albert Lee312f7da2005-09-27 17:38:03 +08004641
Linus Torvalds1da177e2005-04-16 15:20:36 -07004642 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4643 ap->ops->bmdma_setup(qc); /* set up bmdma */
Albert Lee312f7da2005-09-27 17:38:03 +08004644 ap->hsm_task_state = HSM_ST_FIRST;
4645
4646 /* send cdb by polling if no cdb interrupt */
4647 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Albert Lee31ce6da2006-04-03 18:31:44 +08004648 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004649 break;
4650
4651 default:
4652 WARN_ON(1);
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004653 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004654 }
4655
4656 return 0;
4657}
4658
4659/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004660 * ata_host_intr - Handle host interrupt for given (port, task)
4661 * @ap: Port on which interrupt arrived (possibly...)
4662 * @qc: Taskfile currently active in engine
4663 *
4664 * Handle host interrupt for given queued command. Currently,
4665 * only DMA interrupts are handled. All other commands are
4666 * handled via polling with interrupts disabled (nIEN bit).
4667 *
4668 * LOCKING:
4669 * spin_lock_irqsave(host_set lock)
4670 *
4671 * RETURNS:
4672 * One if interrupt was handled, zero if not (shared irq).
4673 */
4674
4675inline unsigned int ata_host_intr (struct ata_port *ap,
4676 struct ata_queued_cmd *qc)
4677{
Albert Lee312f7da2005-09-27 17:38:03 +08004678 u8 status, host_stat = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004679
Albert Lee312f7da2005-09-27 17:38:03 +08004680 VPRINTK("ata%u: protocol %d task_state %d\n",
4681 ap->id, qc->tf.protocol, ap->hsm_task_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004682
Albert Lee312f7da2005-09-27 17:38:03 +08004683 /* Check whether we are expecting interrupt in this state */
4684 switch (ap->hsm_task_state) {
4685 case HSM_ST_FIRST:
Albert Lee6912ccd2006-03-25 17:45:49 +08004686 /* Some pre-ATAPI-4 devices assert INTRQ
4687 * at this state when ready to receive CDB.
4688 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689
Albert Lee312f7da2005-09-27 17:38:03 +08004690 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4691 * The flag was turned on only for atapi devices.
4692 * No need to check is_atapi_taskfile(&qc->tf) again.
4693 */
4694 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004695 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004696 break;
Albert Lee312f7da2005-09-27 17:38:03 +08004697 case HSM_ST_LAST:
4698 if (qc->tf.protocol == ATA_PROT_DMA ||
4699 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4700 /* check status of DMA engine */
4701 host_stat = ap->ops->bmdma_status(ap);
4702 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004703
Albert Lee312f7da2005-09-27 17:38:03 +08004704 /* if it's not our irq... */
4705 if (!(host_stat & ATA_DMA_INTR))
4706 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004707
Albert Lee312f7da2005-09-27 17:38:03 +08004708 /* before we do anything else, clear DMA-Start bit */
4709 ap->ops->bmdma_stop(qc);
Albert Leea4f16612005-12-26 16:40:53 +08004710
4711 if (unlikely(host_stat & ATA_DMA_ERR)) {
4712 /* error when transfering data to/from memory */
4713 qc->err_mask |= AC_ERR_HOST_BUS;
4714 ap->hsm_task_state = HSM_ST_ERR;
4715 }
Albert Lee312f7da2005-09-27 17:38:03 +08004716 }
4717 break;
4718 case HSM_ST:
4719 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004720 default:
4721 goto idle_irq;
4722 }
4723
Albert Lee312f7da2005-09-27 17:38:03 +08004724 /* check altstatus */
4725 status = ata_altstatus(ap);
4726 if (status & ATA_BUSY)
4727 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004728
Albert Lee312f7da2005-09-27 17:38:03 +08004729 /* check main status, clearing INTRQ */
4730 status = ata_chk_status(ap);
4731 if (unlikely(status & ATA_BUSY))
4732 goto idle_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004733
Albert Lee312f7da2005-09-27 17:38:03 +08004734 /* ack bmdma irq events */
4735 ap->ops->irq_clear(ap);
4736
Albert Leebb5cb292006-03-25 17:48:02 +08004737 ata_hsm_move(ap, qc, status, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004738 return 1; /* irq handled */
4739
4740idle_irq:
4741 ap->stats.idle_irq++;
4742
4743#ifdef ATA_IRQ_TRAP
4744 if ((ap->stats.idle_irq % 1000) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004745 ata_irq_ack(ap, 0); /* debug trap */
Tejun Heof15a1da2006-05-15 20:57:56 +09004746 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
Alan Cox23cfce82006-03-21 16:06:53 +00004747 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004748 }
4749#endif
4750 return 0; /* irq not handled */
4751}
4752
4753/**
4754 * ata_interrupt - Default ATA host interrupt handler
Jeff Garzik0cba6322005-05-30 19:49:12 -04004755 * @irq: irq line (unused)
4756 * @dev_instance: pointer to our ata_host_set information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004757 * @regs: unused
4758 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004759 * Default interrupt handler for PCI IDE devices. Calls
4760 * ata_host_intr() for each port that is not disabled.
4761 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004762 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004763 * Obtains host_set lock during operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004764 *
4765 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004766 * IRQ_NONE or IRQ_HANDLED.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004767 */
4768
4769irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4770{
4771 struct ata_host_set *host_set = dev_instance;
4772 unsigned int i;
4773 unsigned int handled = 0;
4774 unsigned long flags;
4775
4776 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4777 spin_lock_irqsave(&host_set->lock, flags);
4778
4779 for (i = 0; i < host_set->n_ports; i++) {
4780 struct ata_port *ap;
4781
4782 ap = host_set->ports[i];
Tejun Heoc1389502005-08-22 14:59:24 +09004783 if (ap &&
Jeff Garzik029f5462006-04-02 10:30:40 -04004784 !(ap->flags & ATA_FLAG_DISABLED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004785 struct ata_queued_cmd *qc;
4786
4787 qc = ata_qc_from_tag(ap, ap->active_tag);
Albert Lee312f7da2005-09-27 17:38:03 +08004788 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
Albert Lee21b1ed72005-04-29 17:34:59 +08004789 (qc->flags & ATA_QCFLAG_ACTIVE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004790 handled |= ata_host_intr(ap, qc);
4791 }
4792 }
4793
4794 spin_unlock_irqrestore(&host_set->lock, flags);
4795
4796 return IRQ_RETVAL(handled);
4797}
4798
Tejun Heo34bf2172006-05-15 20:57:46 +09004799/**
4800 * sata_scr_valid - test whether SCRs are accessible
4801 * @ap: ATA port to test SCR accessibility for
4802 *
4803 * Test whether SCRs are accessible for @ap.
4804 *
4805 * LOCKING:
4806 * None.
4807 *
4808 * RETURNS:
4809 * 1 if SCRs are accessible, 0 otherwise.
4810 */
4811int sata_scr_valid(struct ata_port *ap)
4812{
4813 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4814}
4815
4816/**
4817 * sata_scr_read - read SCR register of the specified port
4818 * @ap: ATA port to read SCR for
4819 * @reg: SCR to read
4820 * @val: Place to store read value
4821 *
4822 * Read SCR register @reg of @ap into *@val. This function is
4823 * guaranteed to succeed if the cable type of the port is SATA
4824 * and the port implements ->scr_read.
4825 *
4826 * LOCKING:
4827 * None.
4828 *
4829 * RETURNS:
4830 * 0 on success, negative errno on failure.
4831 */
4832int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4833{
4834 if (sata_scr_valid(ap)) {
4835 *val = ap->ops->scr_read(ap, reg);
4836 return 0;
4837 }
4838 return -EOPNOTSUPP;
4839}
4840
4841/**
4842 * sata_scr_write - write SCR register of the specified port
4843 * @ap: ATA port to write SCR for
4844 * @reg: SCR to write
4845 * @val: value to write
4846 *
4847 * Write @val to SCR register @reg of @ap. This function is
4848 * guaranteed to succeed if the cable type of the port is SATA
4849 * and the port implements ->scr_read.
4850 *
4851 * LOCKING:
4852 * None.
4853 *
4854 * RETURNS:
4855 * 0 on success, negative errno on failure.
4856 */
4857int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4858{
4859 if (sata_scr_valid(ap)) {
4860 ap->ops->scr_write(ap, reg, val);
4861 return 0;
4862 }
4863 return -EOPNOTSUPP;
4864}
4865
4866/**
4867 * sata_scr_write_flush - write SCR register of the specified port and flush
4868 * @ap: ATA port to write SCR for
4869 * @reg: SCR to write
4870 * @val: value to write
4871 *
4872 * This function is identical to sata_scr_write() except that this
4873 * function performs flush after writing to the register.
4874 *
4875 * LOCKING:
4876 * None.
4877 *
4878 * RETURNS:
4879 * 0 on success, negative errno on failure.
4880 */
4881int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4882{
4883 if (sata_scr_valid(ap)) {
4884 ap->ops->scr_write(ap, reg, val);
4885 ap->ops->scr_read(ap, reg);
4886 return 0;
4887 }
4888 return -EOPNOTSUPP;
4889}
4890
4891/**
4892 * ata_port_online - test whether the given port is online
4893 * @ap: ATA port to test
4894 *
4895 * Test whether @ap is online. Note that this function returns 0
4896 * if online status of @ap cannot be obtained, so
4897 * ata_port_online(ap) != !ata_port_offline(ap).
4898 *
4899 * LOCKING:
4900 * None.
4901 *
4902 * RETURNS:
4903 * 1 if the port online status is available and online.
4904 */
4905int ata_port_online(struct ata_port *ap)
4906{
4907 u32 sstatus;
4908
4909 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4910 return 1;
4911 return 0;
4912}
4913
4914/**
4915 * ata_port_offline - test whether the given port is offline
4916 * @ap: ATA port to test
4917 *
4918 * Test whether @ap is offline. Note that this function returns
4919 * 0 if offline status of @ap cannot be obtained, so
4920 * ata_port_online(ap) != !ata_port_offline(ap).
4921 *
4922 * LOCKING:
4923 * None.
4924 *
4925 * RETURNS:
4926 * 1 if the port offline status is available and offline.
4927 */
4928int ata_port_offline(struct ata_port *ap)
4929{
4930 u32 sstatus;
4931
4932 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4933 return 1;
4934 return 0;
4935}
Edward Falk0baab862005-06-02 18:17:13 -04004936
Jens Axboe9b847542006-01-06 09:28:07 +01004937/*
4938 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4939 * without filling any other registers
4940 */
Tejun Heo3373efd2006-05-15 20:57:53 +09004941static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
Jens Axboe9b847542006-01-06 09:28:07 +01004942{
4943 struct ata_taskfile tf;
4944 int err;
4945
Tejun Heo3373efd2006-05-15 20:57:53 +09004946 ata_tf_init(dev, &tf);
Jens Axboe9b847542006-01-06 09:28:07 +01004947
4948 tf.command = cmd;
4949 tf.flags |= ATA_TFLAG_DEVICE;
4950 tf.protocol = ATA_PROT_NODATA;
4951
Tejun Heo3373efd2006-05-15 20:57:53 +09004952 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Jens Axboe9b847542006-01-06 09:28:07 +01004953 if (err)
Tejun Heof15a1da2006-05-15 20:57:56 +09004954 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4955 __FUNCTION__, err);
Jens Axboe9b847542006-01-06 09:28:07 +01004956
4957 return err;
4958}
4959
Tejun Heo3373efd2006-05-15 20:57:53 +09004960static int ata_flush_cache(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004961{
4962 u8 cmd;
4963
4964 if (!ata_try_flush_cache(dev))
4965 return 0;
4966
4967 if (ata_id_has_flush_ext(dev->id))
4968 cmd = ATA_CMD_FLUSH_EXT;
4969 else
4970 cmd = ATA_CMD_FLUSH;
4971
Tejun Heo3373efd2006-05-15 20:57:53 +09004972 return ata_do_simple_cmd(dev, cmd);
Jens Axboe9b847542006-01-06 09:28:07 +01004973}
4974
Tejun Heo3373efd2006-05-15 20:57:53 +09004975static int ata_standby_drive(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004976{
Tejun Heo3373efd2006-05-15 20:57:53 +09004977 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
Jens Axboe9b847542006-01-06 09:28:07 +01004978}
4979
Tejun Heo3373efd2006-05-15 20:57:53 +09004980static int ata_start_drive(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004981{
Tejun Heo3373efd2006-05-15 20:57:53 +09004982 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
Jens Axboe9b847542006-01-06 09:28:07 +01004983}
4984
4985/**
4986 * ata_device_resume - wakeup a previously suspended devices
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004987 * @dev: the device to resume
Jens Axboe9b847542006-01-06 09:28:07 +01004988 *
4989 * Kick the drive back into action, by sending it an idle immediate
4990 * command and making sure its transfer mode matches between drive
4991 * and host.
4992 *
4993 */
Tejun Heo3373efd2006-05-15 20:57:53 +09004994int ata_device_resume(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004995{
Tejun Heo3373efd2006-05-15 20:57:53 +09004996 struct ata_port *ap = dev->ap;
4997
Jens Axboe9b847542006-01-06 09:28:07 +01004998 if (ap->flags & ATA_FLAG_SUSPENDED) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09004999 struct ata_device *failed_dev;
Jens Axboe9b847542006-01-06 09:28:07 +01005000 ap->flags &= ~ATA_FLAG_SUSPENDED;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09005001 while (ata_set_mode(ap, &failed_dev))
Tejun Heo3373efd2006-05-15 20:57:53 +09005002 ata_dev_disable(failed_dev);
Jens Axboe9b847542006-01-06 09:28:07 +01005003 }
Tejun Heoe1211e32006-04-01 01:38:18 +09005004 if (!ata_dev_enabled(dev))
Jens Axboe9b847542006-01-06 09:28:07 +01005005 return 0;
5006 if (dev->class == ATA_DEV_ATA)
Tejun Heo3373efd2006-05-15 20:57:53 +09005007 ata_start_drive(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01005008
5009 return 0;
5010}
5011
5012/**
5013 * ata_device_suspend - prepare a device for suspend
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005014 * @dev: the device to suspend
Randy Dunlape2a7f772006-05-18 10:50:18 -07005015 * @state: target power management state
Jens Axboe9b847542006-01-06 09:28:07 +01005016 *
5017 * Flush the cache on the drive, if appropriate, then issue a
5018 * standbynow command.
Jens Axboe9b847542006-01-06 09:28:07 +01005019 */
Tejun Heo3373efd2006-05-15 20:57:53 +09005020int ata_device_suspend(struct ata_device *dev, pm_message_t state)
Jens Axboe9b847542006-01-06 09:28:07 +01005021{
Tejun Heo3373efd2006-05-15 20:57:53 +09005022 struct ata_port *ap = dev->ap;
5023
Tejun Heoe1211e32006-04-01 01:38:18 +09005024 if (!ata_dev_enabled(dev))
Jens Axboe9b847542006-01-06 09:28:07 +01005025 return 0;
5026 if (dev->class == ATA_DEV_ATA)
Tejun Heo3373efd2006-05-15 20:57:53 +09005027 ata_flush_cache(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01005028
Nigel Cunningham082776e2006-03-23 23:22:16 +10005029 if (state.event != PM_EVENT_FREEZE)
Tejun Heo3373efd2006-05-15 20:57:53 +09005030 ata_standby_drive(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01005031 ap->flags |= ATA_FLAG_SUSPENDED;
5032 return 0;
5033}
5034
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005035/**
5036 * ata_port_start - Set port up for dma.
5037 * @ap: Port to initialize
5038 *
5039 * Called just after data structures for each port are
5040 * initialized. Allocates space for PRD table.
5041 *
5042 * May be used as the port_start() entry in ata_port_operations.
5043 *
5044 * LOCKING:
5045 * Inherited from caller.
5046 */
5047
Linus Torvalds1da177e2005-04-16 15:20:36 -07005048int ata_port_start (struct ata_port *ap)
5049{
Brian King2f1f6102006-03-23 17:30:15 -06005050 struct device *dev = ap->dev;
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005051 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005052
5053 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
5054 if (!ap->prd)
5055 return -ENOMEM;
5056
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005057 rc = ata_pad_alloc(ap, dev);
5058 if (rc) {
Jeff Garzikcedc9a42005-10-05 07:13:30 -04005059 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005060 return rc;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04005061 }
5062
Linus Torvalds1da177e2005-04-16 15:20:36 -07005063 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
5064
5065 return 0;
5066}
5067
Edward Falk0baab862005-06-02 18:17:13 -04005068
5069/**
5070 * ata_port_stop - Undo ata_port_start()
5071 * @ap: Port to shut down
5072 *
5073 * Frees the PRD table.
5074 *
5075 * May be used as the port_stop() entry in ata_port_operations.
5076 *
5077 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04005078 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04005079 */
5080
Linus Torvalds1da177e2005-04-16 15:20:36 -07005081void ata_port_stop (struct ata_port *ap)
5082{
Brian King2f1f6102006-03-23 17:30:15 -06005083 struct device *dev = ap->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005084
5085 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05005086 ata_pad_free(ap, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005087}
5088
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04005089void ata_host_stop (struct ata_host_set *host_set)
5090{
5091 if (host_set->mmio_base)
5092 iounmap(host_set->mmio_base);
5093}
5094
5095
Linus Torvalds1da177e2005-04-16 15:20:36 -07005096/**
5097 * ata_host_remove - Unregister SCSI host structure with upper layers
5098 * @ap: Port to unregister
5099 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5100 *
5101 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04005102 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005103 */
5104
5105static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
5106{
5107 struct Scsi_Host *sh = ap->host;
5108
5109 DPRINTK("ENTER\n");
5110
5111 if (do_unregister)
5112 scsi_remove_host(sh);
5113
5114 ap->ops->port_stop(ap);
5115}
5116
5117/**
5118 * ata_host_init - Initialize an ata_port structure
5119 * @ap: Structure to initialize
5120 * @host: associated SCSI mid-layer structure
5121 * @host_set: Collection of hosts to which @ap belongs
5122 * @ent: Probe information provided by low-level driver
5123 * @port_no: Port number associated with this ata_port
5124 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005125 * Initialize a new ata_port structure, and its associated
5126 * scsi_host.
5127 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005128 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005129 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005130 */
5131
5132static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
5133 struct ata_host_set *host_set,
Jeff Garzik057ace52005-10-22 14:27:05 -04005134 const struct ata_probe_ent *ent, unsigned int port_no)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005135{
5136 unsigned int i;
5137
5138 host->max_id = 16;
5139 host->max_lun = 1;
5140 host->max_channel = 1;
5141 host->unique_id = ata_unique_id++;
5142 host->max_cmd_len = 12;
Christoph Hellwig12413192005-06-11 01:05:01 +02005143
Tejun Heo198e0fe2006-04-02 18:51:52 +09005144 ap->flags = ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005145 ap->id = host->unique_id;
5146 ap->host = host;
5147 ap->ctl = ATA_DEVCTL_OBS;
5148 ap->host_set = host_set;
Brian King2f1f6102006-03-23 17:30:15 -06005149 ap->dev = ent->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005150 ap->port_no = port_no;
5151 ap->hard_port_no =
5152 ent->legacy_mode ? ent->hard_port_no : port_no;
5153 ap->pio_mask = ent->pio_mask;
5154 ap->mwdma_mask = ent->mwdma_mask;
5155 ap->udma_mask = ent->udma_mask;
5156 ap->flags |= ent->host_flags;
5157 ap->ops = ent->port_ops;
Tejun Heo1c3fae42006-04-02 20:53:28 +09005158 ap->sata_spd_limit = UINT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005159 ap->active_tag = ATA_TAG_POISON;
5160 ap->last_ctl = 0xFF;
5161
Tejun Heo86e45b62006-03-05 15:29:09 +09005162 INIT_WORK(&ap->port_task, NULL, NULL);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09005163 INIT_LIST_HEAD(&ap->eh_done_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005164
Tejun Heo838df622006-05-15 20:57:44 +09005165 /* set cable type */
5166 ap->cbl = ATA_CBL_NONE;
5167 if (ap->flags & ATA_FLAG_SATA)
5168 ap->cbl = ATA_CBL_SATA;
5169
Tejun Heoacf356b2006-03-24 14:07:50 +09005170 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5171 struct ata_device *dev = &ap->device[i];
Tejun Heo38d87232006-05-15 20:57:51 +09005172 dev->ap = ap;
Tejun Heoacf356b2006-03-24 14:07:50 +09005173 dev->devno = i;
5174 dev->pio_mask = UINT_MAX;
5175 dev->mwdma_mask = UINT_MAX;
5176 dev->udma_mask = UINT_MAX;
5177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005178
5179#ifdef ATA_IRQ_TRAP
5180 ap->stats.unhandled_irq = 1;
5181 ap->stats.idle_irq = 1;
5182#endif
5183
5184 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
5185}
5186
5187/**
5188 * ata_host_add - Attach low-level ATA driver to system
5189 * @ent: Information provided by low-level driver
5190 * @host_set: Collections of ports to which we add
5191 * @port_no: Port number associated with this host
5192 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04005193 * Attach low-level ATA driver to system.
5194 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005195 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005196 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005197 *
5198 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005199 * New ata_port on success, for NULL on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005200 */
5201
Jeff Garzik057ace52005-10-22 14:27:05 -04005202static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005203 struct ata_host_set *host_set,
5204 unsigned int port_no)
5205{
5206 struct Scsi_Host *host;
5207 struct ata_port *ap;
5208 int rc;
5209
5210 DPRINTK("ENTER\n");
Tejun Heoaec5c3c2006-03-25 01:33:34 +09005211
5212 if (!ent->port_ops->probe_reset &&
5213 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
5214 printk(KERN_ERR "ata%u: no reset mechanism available\n",
5215 port_no);
5216 return NULL;
5217 }
5218
Linus Torvalds1da177e2005-04-16 15:20:36 -07005219 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
5220 if (!host)
5221 return NULL;
5222
Tejun Heo30afc842006-03-18 18:40:14 +09005223 host->transportt = &ata_scsi_transport_template;
5224
Jeff Garzik35bb94b2006-04-11 13:12:34 -04005225 ap = ata_shost_to_port(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005226
5227 ata_host_init(ap, host, host_set, ent, port_no);
5228
5229 rc = ap->ops->port_start(ap);
5230 if (rc)
5231 goto err_out;
5232
5233 return ap;
5234
5235err_out:
5236 scsi_host_put(host);
5237 return NULL;
5238}
5239
5240/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04005241 * ata_device_add - Register hardware device with ATA and SCSI layers
5242 * @ent: Probe information describing hardware device to be registered
5243 *
5244 * This function processes the information provided in the probe
5245 * information struct @ent, allocates the necessary ATA and SCSI
5246 * host information structures, initializes them, and registers
5247 * everything with requisite kernel subsystems.
5248 *
5249 * This function requests irqs, probes the ATA bus, and probes
5250 * the SCSI bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005251 *
5252 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005253 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005254 *
5255 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04005256 * Number of ports registered. Zero on error (no ports registered).
Linus Torvalds1da177e2005-04-16 15:20:36 -07005257 */
5258
Jeff Garzik057ace52005-10-22 14:27:05 -04005259int ata_device_add(const struct ata_probe_ent *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005260{
5261 unsigned int count = 0, i;
5262 struct device *dev = ent->dev;
5263 struct ata_host_set *host_set;
5264
5265 DPRINTK("ENTER\n");
5266 /* alloc a container for our list of ATA ports (buses) */
Randy Dunlap57f3bda2005-10-28 20:37:23 -07005267 host_set = kzalloc(sizeof(struct ata_host_set) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07005268 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
5269 if (!host_set)
5270 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005271 spin_lock_init(&host_set->lock);
5272
5273 host_set->dev = dev;
5274 host_set->n_ports = ent->n_ports;
5275 host_set->irq = ent->irq;
5276 host_set->mmio_base = ent->mmio_base;
5277 host_set->private_data = ent->private_data;
5278 host_set->ops = ent->port_ops;
Alan Cox5444a6f2006-03-27 18:58:20 +01005279 host_set->flags = ent->host_set_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005280
5281 /* register each port bound to this device */
5282 for (i = 0; i < ent->n_ports; i++) {
5283 struct ata_port *ap;
5284 unsigned long xfer_mode_mask;
5285
5286 ap = ata_host_add(ent, host_set, i);
5287 if (!ap)
5288 goto err_out;
5289
5290 host_set->ports[i] = ap;
5291 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
5292 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
5293 (ap->pio_mask << ATA_SHIFT_PIO);
5294
5295 /* print per-port info to dmesg */
Tejun Heof15a1da2006-05-15 20:57:56 +09005296 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
5297 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5298 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
5299 ata_mode_string(xfer_mode_mask),
5300 ap->ioaddr.cmd_addr,
5301 ap->ioaddr.ctl_addr,
5302 ap->ioaddr.bmdma_addr,
5303 ent->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005304
5305 ata_chk_status(ap);
5306 host_set->ops->irq_clear(ap);
Tejun Heoe3180492006-05-15 20:58:09 +09005307 ata_eh_freeze_port(ap); /* freeze port before requesting IRQ */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005308 count++;
5309 }
5310
Randy Dunlap57f3bda2005-10-28 20:37:23 -07005311 if (!count)
5312 goto err_free_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005313
5314 /* obtain irq, that is shared between channels */
5315 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
5316 DRV_NAME, host_set))
5317 goto err_out;
5318
5319 /* perform each probe synchronously */
5320 DPRINTK("probe begin\n");
5321 for (i = 0; i < count; i++) {
5322 struct ata_port *ap;
5323 int rc;
5324
5325 ap = host_set->ports[i];
5326
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005327 DPRINTK("ata%u: bus probe begin\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005328 rc = ata_bus_probe(ap);
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005329 DPRINTK("ata%u: bus probe end\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005330
5331 if (rc) {
5332 /* FIXME: do something useful here?
5333 * Current libata behavior will
5334 * tear down everything when
5335 * the module is removed
5336 * or the h/w is unplugged.
5337 */
5338 }
5339
5340 rc = scsi_add_host(ap->host, dev);
5341 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09005342 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005343 /* FIXME: do something useful here */
5344 /* FIXME: handle unconditional calls to
5345 * scsi_scan_host and ata_host_remove, below,
5346 * at the very least
5347 */
5348 }
5349 }
5350
5351 /* probes are done, now scan each port's disk(s) */
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005352 DPRINTK("host probe begin\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005353 for (i = 0; i < count; i++) {
5354 struct ata_port *ap = host_set->ports[i];
5355
Jeff Garzik644dd0c2005-10-03 15:55:19 -04005356 ata_scsi_scan_host(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005357 }
5358
5359 dev_set_drvdata(dev, host_set);
5360
5361 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5362 return ent->n_ports; /* success */
5363
5364err_out:
5365 for (i = 0; i < count; i++) {
5366 ata_host_remove(host_set->ports[i], 1);
5367 scsi_host_put(host_set->ports[i]->host);
5368 }
Randy Dunlap57f3bda2005-10-28 20:37:23 -07005369err_free_ret:
Linus Torvalds1da177e2005-04-16 15:20:36 -07005370 kfree(host_set);
5371 VPRINTK("EXIT, returning 0\n");
5372 return 0;
5373}
5374
5375/**
Alan Cox17b14452005-09-15 15:44:00 +01005376 * ata_host_set_remove - PCI layer callback for device removal
5377 * @host_set: ATA host set that was removed
5378 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05005379 * Unregister all objects associated with this host set. Free those
Alan Cox17b14452005-09-15 15:44:00 +01005380 * objects.
5381 *
5382 * LOCKING:
5383 * Inherited from calling layer (may sleep).
5384 */
5385
Alan Cox17b14452005-09-15 15:44:00 +01005386void ata_host_set_remove(struct ata_host_set *host_set)
5387{
5388 struct ata_port *ap;
5389 unsigned int i;
5390
5391 for (i = 0; i < host_set->n_ports; i++) {
5392 ap = host_set->ports[i];
5393 scsi_remove_host(ap->host);
5394 }
5395
5396 free_irq(host_set->irq, host_set);
5397
5398 for (i = 0; i < host_set->n_ports; i++) {
5399 ap = host_set->ports[i];
5400
5401 ata_scsi_release(ap->host);
5402
5403 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5404 struct ata_ioports *ioaddr = &ap->ioaddr;
5405
5406 if (ioaddr->cmd_addr == 0x1f0)
5407 release_region(0x1f0, 8);
5408 else if (ioaddr->cmd_addr == 0x170)
5409 release_region(0x170, 8);
5410 }
5411
5412 scsi_host_put(ap->host);
5413 }
5414
5415 if (host_set->ops->host_stop)
5416 host_set->ops->host_stop(host_set);
5417
5418 kfree(host_set);
5419}
5420
5421/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005422 * ata_scsi_release - SCSI layer callback hook for host unload
5423 * @host: libata host to be unloaded
5424 *
5425 * Performs all duties necessary to shut down a libata port...
5426 * Kill port kthread, disable port, and release resources.
5427 *
5428 * LOCKING:
5429 * Inherited from SCSI layer.
5430 *
5431 * RETURNS:
5432 * One.
5433 */
5434
5435int ata_scsi_release(struct Scsi_Host *host)
5436{
Jeff Garzik35bb94b2006-04-11 13:12:34 -04005437 struct ata_port *ap = ata_shost_to_port(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005438
5439 DPRINTK("ENTER\n");
5440
5441 ap->ops->port_disable(ap);
5442 ata_host_remove(ap, 0);
5443
5444 DPRINTK("EXIT\n");
5445 return 1;
5446}
5447
5448/**
5449 * ata_std_ports - initialize ioaddr with standard port offsets.
5450 * @ioaddr: IO address structure to be initialized
Edward Falk0baab862005-06-02 18:17:13 -04005451 *
5452 * Utility function which initializes data_addr, error_addr,
5453 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5454 * device_addr, status_addr, and command_addr to standard offsets
5455 * relative to cmd_addr.
5456 *
5457 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005458 */
Edward Falk0baab862005-06-02 18:17:13 -04005459
Linus Torvalds1da177e2005-04-16 15:20:36 -07005460void ata_std_ports(struct ata_ioports *ioaddr)
5461{
5462 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5463 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5464 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5465 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5466 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5467 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5468 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5469 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5470 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5471 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5472}
5473
Edward Falk0baab862005-06-02 18:17:13 -04005474
Jeff Garzik374b1872005-08-30 05:42:52 -04005475#ifdef CONFIG_PCI
5476
5477void ata_pci_host_stop (struct ata_host_set *host_set)
5478{
5479 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5480
5481 pci_iounmap(pdev, host_set->mmio_base);
5482}
5483
Edward Falk0baab862005-06-02 18:17:13 -04005484/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005485 * ata_pci_remove_one - PCI layer callback for device removal
5486 * @pdev: PCI device that was removed
5487 *
5488 * PCI layer indicates to libata via this hook that
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04005489 * hot-unplug or module unload event has occurred.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005490 * Handle this by unregistering all objects associated
5491 * with this PCI device. Free those objects. Then finally
5492 * release PCI resources and disable device.
5493 *
5494 * LOCKING:
5495 * Inherited from PCI layer (may sleep).
5496 */
5497
5498void ata_pci_remove_one (struct pci_dev *pdev)
5499{
5500 struct device *dev = pci_dev_to_dev(pdev);
5501 struct ata_host_set *host_set = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005502
Alan Cox17b14452005-09-15 15:44:00 +01005503 ata_host_set_remove(host_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005504 pci_release_regions(pdev);
5505 pci_disable_device(pdev);
5506 dev_set_drvdata(dev, NULL);
5507}
5508
5509/* move to PCI subsystem */
Jeff Garzik057ace52005-10-22 14:27:05 -04005510int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005511{
5512 unsigned long tmp = 0;
5513
5514 switch (bits->width) {
5515 case 1: {
5516 u8 tmp8 = 0;
5517 pci_read_config_byte(pdev, bits->reg, &tmp8);
5518 tmp = tmp8;
5519 break;
5520 }
5521 case 2: {
5522 u16 tmp16 = 0;
5523 pci_read_config_word(pdev, bits->reg, &tmp16);
5524 tmp = tmp16;
5525 break;
5526 }
5527 case 4: {
5528 u32 tmp32 = 0;
5529 pci_read_config_dword(pdev, bits->reg, &tmp32);
5530 tmp = tmp32;
5531 break;
5532 }
5533
5534 default:
5535 return -EINVAL;
5536 }
5537
5538 tmp &= bits->mask;
5539
5540 return (tmp == bits->val) ? 1 : 0;
5541}
Jens Axboe9b847542006-01-06 09:28:07 +01005542
5543int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5544{
5545 pci_save_state(pdev);
5546 pci_disable_device(pdev);
5547 pci_set_power_state(pdev, PCI_D3hot);
5548 return 0;
5549}
5550
5551int ata_pci_device_resume(struct pci_dev *pdev)
5552{
5553 pci_set_power_state(pdev, PCI_D0);
5554 pci_restore_state(pdev);
5555 pci_enable_device(pdev);
5556 pci_set_master(pdev);
5557 return 0;
5558}
Linus Torvalds1da177e2005-04-16 15:20:36 -07005559#endif /* CONFIG_PCI */
5560
5561
Linus Torvalds1da177e2005-04-16 15:20:36 -07005562static int __init ata_init(void)
5563{
5564 ata_wq = create_workqueue("ata");
5565 if (!ata_wq)
5566 return -ENOMEM;
5567
5568 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5569 return 0;
5570}
5571
5572static void __exit ata_exit(void)
5573{
5574 destroy_workqueue(ata_wq);
5575}
5576
5577module_init(ata_init);
5578module_exit(ata_exit);
5579
Jeff Garzik67846b32005-10-05 02:58:32 -04005580static unsigned long ratelimit_time;
5581static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5582
5583int ata_ratelimit(void)
5584{
5585 int rc;
5586 unsigned long flags;
5587
5588 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5589
5590 if (time_after(jiffies, ratelimit_time)) {
5591 rc = 1;
5592 ratelimit_time = jiffies + (HZ/5);
5593 } else
5594 rc = 0;
5595
5596 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5597
5598 return rc;
5599}
5600
Tejun Heoc22daff2006-04-11 22:22:29 +09005601/**
5602 * ata_wait_register - wait until register value changes
5603 * @reg: IO-mapped register
5604 * @mask: Mask to apply to read register value
5605 * @val: Wait condition
5606 * @interval_msec: polling interval in milliseconds
5607 * @timeout_msec: timeout in milliseconds
5608 *
5609 * Waiting for some bits of register to change is a common
5610 * operation for ATA controllers. This function reads 32bit LE
5611 * IO-mapped register @reg and tests for the following condition.
5612 *
5613 * (*@reg & mask) != val
5614 *
5615 * If the condition is met, it returns; otherwise, the process is
5616 * repeated after @interval_msec until timeout.
5617 *
5618 * LOCKING:
5619 * Kernel thread context (may sleep)
5620 *
5621 * RETURNS:
5622 * The final register value.
5623 */
5624u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5625 unsigned long interval_msec,
5626 unsigned long timeout_msec)
5627{
5628 unsigned long timeout;
5629 u32 tmp;
5630
5631 tmp = ioread32(reg);
5632
5633 /* Calculate timeout _after_ the first read to make sure
5634 * preceding writes reach the controller before starting to
5635 * eat away the timeout.
5636 */
5637 timeout = jiffies + (timeout_msec * HZ) / 1000;
5638
5639 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5640 msleep(interval_msec);
5641 tmp = ioread32(reg);
5642 }
5643
5644 return tmp;
5645}
5646
Linus Torvalds1da177e2005-04-16 15:20:36 -07005647/*
5648 * libata is essentially a library of internal helper functions for
5649 * low-level ATA host controller drivers. As such, the API/ABI is
5650 * likely to change as new drivers are added and updated.
5651 * Do not depend on ABI/API stability.
5652 */
5653
5654EXPORT_SYMBOL_GPL(ata_std_bios_param);
5655EXPORT_SYMBOL_GPL(ata_std_ports);
5656EXPORT_SYMBOL_GPL(ata_device_add);
Alan Cox17b14452005-09-15 15:44:00 +01005657EXPORT_SYMBOL_GPL(ata_host_set_remove);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005658EXPORT_SYMBOL_GPL(ata_sg_init);
5659EXPORT_SYMBOL_GPL(ata_sg_init_one);
Tejun Heof686bcb2006-05-15 20:58:05 +09005660EXPORT_SYMBOL_GPL(ata_qc_complete);
Tejun Heodedaf2b2006-05-15 21:03:43 +09005661EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005662EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005663EXPORT_SYMBOL_GPL(ata_tf_load);
5664EXPORT_SYMBOL_GPL(ata_tf_read);
5665EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5666EXPORT_SYMBOL_GPL(ata_std_dev_select);
5667EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5668EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5669EXPORT_SYMBOL_GPL(ata_check_status);
5670EXPORT_SYMBOL_GPL(ata_altstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005671EXPORT_SYMBOL_GPL(ata_exec_command);
5672EXPORT_SYMBOL_GPL(ata_port_start);
5673EXPORT_SYMBOL_GPL(ata_port_stop);
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04005674EXPORT_SYMBOL_GPL(ata_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005675EXPORT_SYMBOL_GPL(ata_interrupt);
Alan Coxa6b2c5d2006-05-22 16:59:59 +01005676EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
5677EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005678EXPORT_SYMBOL_GPL(ata_qc_prep);
Brian Kinge46834c2006-03-17 17:04:03 -06005679EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005680EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5681EXPORT_SYMBOL_GPL(ata_bmdma_start);
5682EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5683EXPORT_SYMBOL_GPL(ata_bmdma_status);
5684EXPORT_SYMBOL_GPL(ata_bmdma_stop);
Tejun Heo6d97dbd2006-05-15 20:58:24 +09005685EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
5686EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
5687EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
5688EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
5689EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005690EXPORT_SYMBOL_GPL(ata_port_probe);
Tejun Heo3c567b72006-05-15 20:57:23 +09005691EXPORT_SYMBOL_GPL(sata_set_spd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005692EXPORT_SYMBOL_GPL(sata_phy_reset);
5693EXPORT_SYMBOL_GPL(__sata_phy_reset);
5694EXPORT_SYMBOL_GPL(ata_bus_reset);
Tejun Heo8a19ac82006-02-02 18:20:00 +09005695EXPORT_SYMBOL_GPL(ata_std_probeinit);
Tejun Heoc2bd5802006-01-24 17:05:22 +09005696EXPORT_SYMBOL_GPL(ata_std_softreset);
5697EXPORT_SYMBOL_GPL(sata_std_hardreset);
5698EXPORT_SYMBOL_GPL(ata_std_postreset);
5699EXPORT_SYMBOL_GPL(ata_std_probe_reset);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09005700EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
Tejun Heo623a3122006-03-05 17:55:58 +09005701EXPORT_SYMBOL_GPL(ata_dev_revalidate);
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05005702EXPORT_SYMBOL_GPL(ata_dev_classify);
5703EXPORT_SYMBOL_GPL(ata_dev_pair);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005704EXPORT_SYMBOL_GPL(ata_port_disable);
Jeff Garzik67846b32005-10-05 02:58:32 -04005705EXPORT_SYMBOL_GPL(ata_ratelimit);
Tejun Heoc22daff2006-04-11 22:22:29 +09005706EXPORT_SYMBOL_GPL(ata_wait_register);
Tejun Heo6f8b9952006-01-24 17:05:21 +09005707EXPORT_SYMBOL_GPL(ata_busy_sleep);
Tejun Heo86e45b62006-03-05 15:29:09 +09005708EXPORT_SYMBOL_GPL(ata_port_queue_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005709EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5710EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005711EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
Tejun Heoa6e6ce82006-05-15 21:03:48 +09005712EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005713EXPORT_SYMBOL_GPL(ata_scsi_release);
5714EXPORT_SYMBOL_GPL(ata_host_intr);
Tejun Heo34bf2172006-05-15 20:57:46 +09005715EXPORT_SYMBOL_GPL(sata_scr_valid);
5716EXPORT_SYMBOL_GPL(sata_scr_read);
5717EXPORT_SYMBOL_GPL(sata_scr_write);
5718EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5719EXPORT_SYMBOL_GPL(ata_port_online);
5720EXPORT_SYMBOL_GPL(ata_port_offline);
Tejun Heo6a62a042006-02-13 10:02:46 +09005721EXPORT_SYMBOL_GPL(ata_id_string);
5722EXPORT_SYMBOL_GPL(ata_id_c_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005723EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5724
Alan Cox1bc4ccf2006-01-09 17:18:14 +00005725EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
Alan Cox452503f2005-10-21 19:01:32 -04005726EXPORT_SYMBOL_GPL(ata_timing_compute);
5727EXPORT_SYMBOL_GPL(ata_timing_merge);
5728
Linus Torvalds1da177e2005-04-16 15:20:36 -07005729#ifdef CONFIG_PCI
5730EXPORT_SYMBOL_GPL(pci_test_config_bits);
Jeff Garzik374b1872005-08-30 05:42:52 -04005731EXPORT_SYMBOL_GPL(ata_pci_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005732EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5733EXPORT_SYMBOL_GPL(ata_pci_init_one);
5734EXPORT_SYMBOL_GPL(ata_pci_remove_one);
Jens Axboe9b847542006-01-06 09:28:07 +01005735EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5736EXPORT_SYMBOL_GPL(ata_pci_device_resume);
Alan Cox67951ad2006-03-22 15:55:54 +00005737EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5738EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005739#endif /* CONFIG_PCI */
Jens Axboe9b847542006-01-06 09:28:07 +01005740
5741EXPORT_SYMBOL_GPL(ata_device_suspend);
5742EXPORT_SYMBOL_GPL(ata_device_resume);
5743EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5744EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
Tejun Heoece1d632006-04-02 18:51:53 +09005745
Tejun Heoece1d632006-04-02 18:51:53 +09005746EXPORT_SYMBOL_GPL(ata_eng_timeout);
Tejun Heo7b70fc02006-05-15 20:58:07 +09005747EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
5748EXPORT_SYMBOL_GPL(ata_port_abort);
Tejun Heoe3180492006-05-15 20:58:09 +09005749EXPORT_SYMBOL_GPL(ata_port_freeze);
5750EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
5751EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
Tejun Heoece1d632006-04-02 18:51:53 +09005752EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5753EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
Tejun Heo022bdb02006-05-15 20:58:22 +09005754EXPORT_SYMBOL_GPL(ata_do_eh);