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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
878 *
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
883 *
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
886 * synchronization.
887 *
888 * LOCKING:
889 * Inherited from caller.
890 */
891void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
892 unsigned long delay)
893{
894 int rc;
895
Tejun Heo2e755f62006-03-05 15:29:09 +0900896 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
Tejun Heo86e45b62006-03-05 15:29:09 +0900897 return;
898
899 PREPARE_WORK(&ap->port_task, fn, data);
900
901 if (!delay)
902 rc = queue_work(ata_wq, &ap->port_task);
903 else
904 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
905
906 /* rc == 0 means that another user is using port task */
907 WARN_ON(rc == 0);
908}
909
910/**
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
913 *
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
916 *
917 * LOCKING:
918 * Kernel thread context (may sleep)
919 */
920void ata_port_flush_task(struct ata_port *ap)
921{
922 unsigned long flags;
923
924 DPRINTK("ENTER\n");
925
926 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo2e755f62006-03-05 15:29:09 +0900927 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
Tejun Heo86e45b62006-03-05 15:29:09 +0900928 spin_unlock_irqrestore(&ap->host_set->lock, flags);
929
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq);
932
933 /*
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
936 * Cancel and flush.
937 */
938 if (!cancel_delayed_work(&ap->port_task)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq);
941 }
942
943 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo2e755f62006-03-05 15:29:09 +0900944 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
Tejun Heo86e45b62006-03-05 15:29:09 +0900945 spin_unlock_irqrestore(&ap->host_set->lock, flags);
946
947 DPRINTK("EXIT\n");
948}
949
Tejun Heo77853bf2006-01-23 13:09:36 +0900950void ata_qc_complete_internal(struct ata_queued_cmd *qc)
Tejun Heoa2a7a662005-12-13 14:48:31 +0900951{
Tejun Heo77853bf2006-01-23 13:09:36 +0900952 struct completion *waiting = qc->private_data;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900953
Tejun Heoa2a7a662005-12-13 14:48:31 +0900954 complete(waiting);
Tejun Heoa2a7a662005-12-13 14:48:31 +0900955}
956
957/**
958 * ata_exec_internal - execute libata internal command
Tejun Heoa2a7a662005-12-13 14:48:31 +0900959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
Tejun Heod69cf372006-04-02 18:51:53 +0900961 * @cdb: CDB for packet command
Tejun Heoa2a7a662005-12-13 14:48:31 +0900962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
965 *
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
971 *
972 * LOCKING:
973 * None. Should be called with kernel context, might sleep.
974 */
975
Tejun Heo3373efd2006-05-15 20:57:53 +0900976unsigned ata_exec_internal(struct ata_device *dev,
Tejun Heo1ad8e7f2006-04-02 18:51:53 +0900977 struct ata_taskfile *tf, const u8 *cdb,
978 int dma_dir, void *buf, unsigned int buflen)
Tejun Heoa2a7a662005-12-13 14:48:31 +0900979{
Tejun Heo3373efd2006-05-15 20:57:53 +0900980 struct ata_port *ap = dev->ap;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900981 u8 command = tf->command;
982 struct ata_queued_cmd *qc;
Tejun Heo2ab7db12006-05-15 20:58:02 +0900983 unsigned int tag, preempted_tag;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900984 DECLARE_COMPLETION(wait);
985 unsigned long flags;
Tejun Heo77853bf2006-01-23 13:09:36 +0900986 unsigned int err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900987
988 spin_lock_irqsave(&ap->host_set->lock, flags);
989
Tejun Heoe3180492006-05-15 20:58:09 +0900990 /* no internal command while frozen */
991 if (ap->flags & ATA_FLAG_FROZEN) {
992 spin_unlock_irqrestore(&ap->host_set->lock, flags);
993 return AC_ERR_SYSTEM;
994 }
995
Tejun Heo2ab7db12006-05-15 20:58:02 +0900996 /* initialize internal qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +0900997
Tejun Heo2ab7db12006-05-15 20:58:02 +0900998 /* XXX: Tag 0 is used for drivers with legacy EH as some
999 * drivers choke if any other tag is given. This breaks
1000 * ata_tag_internal() test for those drivers. Don't use new
1001 * EH stuff without converting to it.
1002 */
1003 if (ap->ops->error_handler)
1004 tag = ATA_TAG_INTERNAL;
1005 else
1006 tag = 0;
1007
1008 if (test_and_set_bit(tag, &ap->qactive))
1009 BUG();
Tejun Heof69499f2006-05-15 20:58:03 +09001010 qc = __ata_qc_from_tag(ap, tag);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001011
1012 qc->tag = tag;
1013 qc->scsicmd = NULL;
1014 qc->ap = ap;
1015 qc->dev = dev;
1016 ata_qc_reinit(qc);
1017
1018 preempted_tag = ap->active_tag;
1019 ap->active_tag = ATA_TAG_POISON;
1020
1021 /* prepare & issue qc */
Tejun Heoa2a7a662005-12-13 14:48:31 +09001022 qc->tf = *tf;
Tejun Heod69cf372006-04-02 18:51:53 +09001023 if (cdb)
1024 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
Tejun Heoe61e0672006-05-15 20:57:40 +09001025 qc->flags |= ATA_QCFLAG_RESULT_TF;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001026 qc->dma_dir = dma_dir;
1027 if (dma_dir != DMA_NONE) {
1028 ata_sg_init_one(qc, buf, buflen);
1029 qc->nsect = buflen / ATA_SECT_SIZE;
1030 }
1031
Tejun Heo77853bf2006-01-23 13:09:36 +09001032 qc->private_data = &wait;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001033 qc->complete_fn = ata_qc_complete_internal;
1034
Tejun Heo8e0e6942006-03-31 20:41:11 +09001035 ata_qc_issue(qc);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001036
1037 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1038
1039 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
Albert Lee41ade502006-03-14 11:19:04 +08001040 ata_port_flush_task(ap);
1041
Tejun Heoa2a7a662005-12-13 14:48:31 +09001042 spin_lock_irqsave(&ap->host_set->lock, flags);
1043
1044 /* We're racing with irq here. If we lose, the
1045 * following test prevents us from completing the qc
1046 * again. If completion irq occurs after here but
1047 * before the caller cleans up, it will result in a
1048 * spurious interrupt. We can live with that.
1049 */
Tejun Heo77853bf2006-01-23 13:09:36 +09001050 if (qc->flags & ATA_QCFLAG_ACTIVE) {
Tejun Heo11a56d22006-01-23 13:09:36 +09001051 qc->err_mask = AC_ERR_TIMEOUT;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001052 ata_qc_complete(qc);
Tejun Heof15a1da2006-05-15 20:57:56 +09001053
1054 ata_dev_printk(dev, KERN_WARNING,
1055 "qc timeout (cmd 0x%x)\n", command);
Tejun Heoa2a7a662005-12-13 14:48:31 +09001056 }
1057
1058 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1059 }
1060
Tejun Heo15869302006-05-15 20:57:33 +09001061 /* finish up */
1062 spin_lock_irqsave(&ap->host_set->lock, flags);
1063
Tejun Heoe61e0672006-05-15 20:57:40 +09001064 *tf = qc->result_tf;
Tejun Heo77853bf2006-01-23 13:09:36 +09001065 err_mask = qc->err_mask;
1066
1067 ata_qc_free(qc);
Tejun Heo2ab7db12006-05-15 20:58:02 +09001068 ap->active_tag = preempted_tag;
Tejun Heo77853bf2006-01-23 13:09:36 +09001069
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001070 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1071 * Until those drivers are fixed, we detect the condition
1072 * here, fail the command with AC_ERR_SYSTEM and reenable the
1073 * port.
1074 *
1075 * Note that this doesn't change any behavior as internal
1076 * command failure results in disabling the device in the
1077 * higher layer for LLDDs without new reset/EH callbacks.
1078 *
1079 * Kill the following code as soon as those drivers are fixed.
1080 */
Tejun Heo198e0fe2006-04-02 18:51:52 +09001081 if (ap->flags & ATA_FLAG_DISABLED) {
Tejun Heo1f7dd3e92006-03-24 15:25:30 +09001082 err_mask |= AC_ERR_SYSTEM;
1083 ata_port_probe(ap);
1084 }
1085
Tejun Heo15869302006-05-15 20:57:33 +09001086 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1087
Tejun Heo77853bf2006-01-23 13:09:36 +09001088 return err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +09001089}
1090
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091/**
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001092 * ata_pio_need_iordy - check if iordy needed
1093 * @adev: ATA device
1094 *
1095 * Check if the current speed of the device requires IORDY. Used
1096 * by various controllers for chip configuration.
1097 */
1098
1099unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1100{
1101 int pio;
1102 int speed = adev->pio_mode - XFER_PIO_0;
1103
1104 if (speed < 2)
1105 return 0;
1106 if (speed > 2)
1107 return 1;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001108
Alan Cox1bc4ccf2006-01-09 17:18:14 +00001109 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1110
1111 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1112 pio = adev->id[ATA_ID_EIDE_PIO];
1113 /* Is the speed faster than the drive allows non IORDY ? */
1114 if (pio) {
1115 /* This is cycle times not frequency - watch the logic! */
1116 if (pio > 240) /* PIO2 is 240nS per cycle */
1117 return 1;
1118 return 0;
1119 }
1120 }
1121 return 0;
1122}
1123
1124/**
Tejun Heo49016ac2006-02-21 02:12:11 +09001125 * ata_dev_read_id - Read ID data from the specified device
Tejun Heo49016ac2006-02-21 02:12:11 +09001126 * @dev: target device
1127 * @p_class: pointer to class of the target device (may be changed)
1128 * @post_reset: is this read ID post-reset?
Tejun Heofe635c72006-05-15 20:57:35 +09001129 * @id: buffer to read IDENTIFY data into
Tejun Heo49016ac2006-02-21 02:12:11 +09001130 *
1131 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1132 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
Tejun Heoaec5c3c2006-03-25 01:33:34 +09001133 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1134 * for pre-ATA4 drives.
Tejun Heo49016ac2006-02-21 02:12:11 +09001135 *
1136 * LOCKING:
1137 * Kernel thread context (may sleep)
1138 *
1139 * RETURNS:
1140 * 0 on success, -errno otherwise.
1141 */
Tejun Heo3373efd2006-05-15 20:57:53 +09001142static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1143 int post_reset, u16 *id)
Tejun Heo49016ac2006-02-21 02:12:11 +09001144{
Tejun Heo3373efd2006-05-15 20:57:53 +09001145 struct ata_port *ap = dev->ap;
Tejun Heo49016ac2006-02-21 02:12:11 +09001146 unsigned int class = *p_class;
Tejun Heo49016ac2006-02-21 02:12:11 +09001147 struct ata_taskfile tf;
1148 unsigned int err_mask = 0;
1149 const char *reason;
1150 int rc;
1151
1152 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1153
Tejun Heo49016ac2006-02-21 02:12:11 +09001154 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1155
1156 retry:
Tejun Heo3373efd2006-05-15 20:57:53 +09001157 ata_tf_init(dev, &tf);
Tejun Heo49016ac2006-02-21 02:12:11 +09001158
1159 switch (class) {
1160 case ATA_DEV_ATA:
1161 tf.command = ATA_CMD_ID_ATA;
1162 break;
1163 case ATA_DEV_ATAPI:
1164 tf.command = ATA_CMD_ID_ATAPI;
1165 break;
1166 default:
1167 rc = -ENODEV;
1168 reason = "unsupported class";
1169 goto err_out;
1170 }
1171
1172 tf.protocol = ATA_PROT_PIO;
1173
Tejun Heo3373efd2006-05-15 20:57:53 +09001174 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo49016ac2006-02-21 02:12:11 +09001175 id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo49016ac2006-02-21 02:12:11 +09001176 if (err_mask) {
1177 rc = -EIO;
1178 reason = "I/O error";
Tejun Heo49016ac2006-02-21 02:12:11 +09001179 goto err_out;
1180 }
1181
1182 swap_buf_le16(id, ATA_ID_WORDS);
1183
Tejun Heo49016ac2006-02-21 02:12:11 +09001184 /* sanity check */
Alan Cox692785e2006-03-27 18:49:19 +01001185 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
Tejun Heo49016ac2006-02-21 02:12:11 +09001186 rc = -EINVAL;
1187 reason = "device reports illegal type";
1188 goto err_out;
1189 }
1190
1191 if (post_reset && class == ATA_DEV_ATA) {
1192 /*
1193 * The exact sequence expected by certain pre-ATA4 drives is:
1194 * SRST RESET
1195 * IDENTIFY
1196 * INITIALIZE DEVICE PARAMETERS
1197 * anything else..
1198 * Some drives were very specific about that exact sequence.
1199 */
1200 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001201 err_mask = ata_dev_init_params(dev, id[3], id[6]);
Tejun Heo49016ac2006-02-21 02:12:11 +09001202 if (err_mask) {
1203 rc = -EIO;
1204 reason = "INIT_DEV_PARAMS failed";
1205 goto err_out;
1206 }
1207
1208 /* current CHS translation info (id[53-58]) might be
1209 * changed. reread the identify device info.
1210 */
1211 post_reset = 0;
1212 goto retry;
1213 }
1214 }
1215
1216 *p_class = class;
Tejun Heofe635c72006-05-15 20:57:35 +09001217
Tejun Heo49016ac2006-02-21 02:12:11 +09001218 return 0;
1219
1220 err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09001221 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1222 "(%s, err_mask=0x%x)\n", reason, err_mask);
Tejun Heo49016ac2006-02-21 02:12:11 +09001223 return rc;
1224}
1225
Tejun Heo3373efd2006-05-15 20:57:53 +09001226static inline u8 ata_dev_knobble(struct ata_device *dev)
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001227{
Tejun Heo3373efd2006-05-15 20:57:53 +09001228 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001229}
1230
Tejun Heo49016ac2006-02-21 02:12:11 +09001231/**
Tejun Heoffeae412006-03-01 16:09:35 +09001232 * ata_dev_configure - Configure the specified ATA/ATAPI device
Tejun Heoffeae412006-03-01 16:09:35 +09001233 * @dev: Target device to configure
Tejun Heo4c2d7212006-03-05 17:55:58 +09001234 * @print_info: Enable device info printout
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 *
Tejun Heoffeae412006-03-01 16:09:35 +09001236 * Configure @dev according to @dev->id. Generic and low-level
1237 * driver specific fixups are also applied.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 *
1239 * LOCKING:
Tejun Heoffeae412006-03-01 16:09:35 +09001240 * Kernel thread context (may sleep)
1241 *
1242 * RETURNS:
1243 * 0 on success, -errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 */
Tejun Heo3373efd2006-05-15 20:57:53 +09001245static int ata_dev_configure(struct ata_device *dev, int print_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246{
Tejun Heo3373efd2006-05-15 20:57:53 +09001247 struct ata_port *ap = dev->ap;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001248 const u16 *id = dev->id;
Tejun Heoff8854b2006-03-06 04:31:56 +09001249 unsigned int xfer_mask;
Tejun Heo6e7846e2006-02-12 23:32:58 +09001250 int i, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
Tejun Heoe1211e32006-04-01 01:38:18 +09001252 if (!ata_dev_enabled(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
Tejun Heoffeae412006-03-01 16:09:35 +09001254 ap->id, dev->devno);
1255 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 }
1257
Tejun Heoffeae412006-03-01 16:09:35 +09001258 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001260 /* print device capabilities */
1261 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001262 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1263 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1264 id[49], id[82], id[83], id[84],
1265 id[85], id[86], id[87], id[88]);
Tejun Heoc39f5eb2006-03-13 19:51:19 +09001266
Tejun Heo208a9932006-03-05 17:55:58 +09001267 /* initialize to-be-configured parameters */
Tejun Heoea1dd4e2006-04-02 18:51:53 +09001268 dev->flags &= ~ATA_DFLAG_CFG_MASK;
Tejun Heo208a9932006-03-05 17:55:58 +09001269 dev->max_sectors = 0;
1270 dev->cdb_len = 0;
1271 dev->n_sectors = 0;
1272 dev->cylinders = 0;
1273 dev->heads = 0;
1274 dev->sectors = 0;
1275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 /*
1277 * common ATA, ATAPI feature tests
1278 */
1279
Tejun Heoff8854b2006-03-06 04:31:56 +09001280 /* find max transfer mode; for printk only */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001281 xfer_mask = ata_id_xfermask(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
Tejun Heo1148c3a2006-03-13 19:48:04 +09001283 ata_dump_id(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
1285 /* ATA-specific feature tests */
1286 if (dev->class == ATA_DEV_ATA) {
Tejun Heo1148c3a2006-03-13 19:48:04 +09001287 dev->n_sectors = ata_id_n_sectors(id);
Tejun Heo29407402006-02-12 22:47:04 +09001288
Tejun Heo1148c3a2006-03-13 19:48:04 +09001289 if (ata_id_has_lba(id)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001290 const char *lba_desc;
Albert Lee8bf62ece2005-05-12 15:29:42 -04001291
Tejun Heo4c2d7212006-03-05 17:55:58 +09001292 lba_desc = "LBA";
1293 dev->flags |= ATA_DFLAG_LBA;
Tejun Heo1148c3a2006-03-13 19:48:04 +09001294 if (ata_id_has_lba48(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001295 dev->flags |= ATA_DFLAG_LBA48;
Tejun Heo4c2d7212006-03-05 17:55:58 +09001296 lba_desc = "LBA48";
1297 }
Albert Lee8bf62ece2005-05-12 15:29:42 -04001298
1299 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001300 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001301 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1302 "max %s, %Lu sectors: %s\n",
1303 ata_id_major_version(id),
1304 ata_mode_string(xfer_mask),
1305 (unsigned long long)dev->n_sectors,
1306 lba_desc);
Tejun Heoffeae412006-03-01 16:09:35 +09001307 } else {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001308 /* CHS */
1309
1310 /* Default translation */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001311 dev->cylinders = id[1];
1312 dev->heads = id[3];
1313 dev->sectors = id[6];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001314
Tejun Heo1148c3a2006-03-13 19:48:04 +09001315 if (ata_id_current_chs_valid(id)) {
Albert Lee8bf62ece2005-05-12 15:29:42 -04001316 /* Current CHS translation is valid. */
Tejun Heo1148c3a2006-03-13 19:48:04 +09001317 dev->cylinders = id[54];
1318 dev->heads = id[55];
1319 dev->sectors = id[56];
Albert Lee8bf62ece2005-05-12 15:29:42 -04001320 }
1321
1322 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001323 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001324 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1325 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1326 ata_id_major_version(id),
1327 ata_mode_string(xfer_mask),
1328 (unsigned long long)dev->n_sectors,
1329 dev->cylinders, dev->heads, dev->sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 }
1331
Tejun Heo6e7846e2006-02-12 23:32:58 +09001332 dev->cdb_len = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 }
1334
1335 /* ATAPI-specific feature tests */
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05001336 else if (dev->class == ATA_DEV_ATAPI) {
Tejun Heo1148c3a2006-03-13 19:48:04 +09001337 rc = atapi_cdb_len(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09001339 ata_dev_printk(dev, KERN_WARNING,
1340 "unsupported CDB len\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001341 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 goto err_out_nosup;
1343 }
Tejun Heo6e7846e2006-02-12 23:32:58 +09001344 dev->cdb_len = (unsigned int) rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
1346 /* print device info to dmesg */
Tejun Heo4c2d7212006-03-05 17:55:58 +09001347 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001348 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s\n",
1349 ata_mode_string(xfer_mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 }
1351
Tejun Heo6e7846e2006-02-12 23:32:58 +09001352 ap->host->max_cmd_len = 0;
1353 for (i = 0; i < ATA_MAX_DEVICES; i++)
1354 ap->host->max_cmd_len = max_t(unsigned int,
1355 ap->host->max_cmd_len,
1356 ap->device[i].cdb_len);
1357
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001358 /* limit bridge transfers to udma5, 200 sectors */
Tejun Heo3373efd2006-05-15 20:57:53 +09001359 if (ata_dev_knobble(dev)) {
Tejun Heo4c2d7212006-03-05 17:55:58 +09001360 if (print_info)
Tejun Heof15a1da2006-05-15 20:57:56 +09001361 ata_dev_printk(dev, KERN_INFO,
1362 "applying bridge limits\n");
Tejun Heo5a529132006-03-24 14:07:50 +09001363 dev->udma_mask &= ATA_UDMA5;
Tejun Heo4b2f3ed2006-03-01 16:09:36 +09001364 dev->max_sectors = ATA_MAX_SECTORS;
1365 }
1366
1367 if (ap->ops->dev_config)
1368 ap->ops->dev_config(ap, dev);
1369
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
Tejun Heoffeae412006-03-01 16:09:35 +09001371 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373err_out_nosup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 DPRINTK("EXIT, err\n");
Tejun Heoffeae412006-03-01 16:09:35 +09001375 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376}
1377
1378/**
1379 * ata_bus_probe - Reset and probe ATA bus
1380 * @ap: Bus to probe
1381 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001382 * Master ATA bus probing function. Initiates a hardware-dependent
1383 * bus reset, then attempts to identify any devices found on
1384 * the bus.
1385 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001387 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 *
1389 * RETURNS:
Tejun Heo96072e62006-04-01 01:38:17 +09001390 * Zero on success, negative errno otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 */
1392
1393static int ata_bus_probe(struct ata_port *ap)
1394{
Tejun Heo28ca5c52006-03-01 16:09:36 +09001395 unsigned int classes[ATA_MAX_DEVICES];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001396 int tries[ATA_MAX_DEVICES];
1397 int i, rc, down_xfermask;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001398 struct ata_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Tejun Heo28ca5c52006-03-01 16:09:36 +09001400 ata_port_probe(ap);
1401
Tejun Heo14d2bac2006-04-02 17:54:46 +09001402 for (i = 0; i < ATA_MAX_DEVICES; i++)
1403 tries[i] = ATA_PROBE_MAX_TRIES;
1404
1405 retry:
1406 down_xfermask = 0;
1407
Tejun Heo20444702006-03-13 01:57:01 +09001408 /* reset and determine device classes */
1409 for (i = 0; i < ATA_MAX_DEVICES; i++)
1410 classes[i] = ATA_DEV_UNKNOWN;
Tejun Heo2061a472006-03-12 00:57:39 +09001411
Tejun Heo20444702006-03-13 01:57:01 +09001412 if (ap->ops->probe_reset) {
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001413 rc = ap->ops->probe_reset(ap, classes);
Tejun Heo28ca5c52006-03-01 16:09:36 +09001414 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09001415 ata_port_printk(ap, KERN_ERR,
1416 "reset failed (errno=%d)\n", rc);
Tejun Heo28ca5c52006-03-01 16:09:36 +09001417 return rc;
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001418 }
Tejun Heo28ca5c52006-03-01 16:09:36 +09001419 } else {
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001420 ap->ops->phy_reset(ap);
1421
Tejun Heof8c2c422006-05-15 20:57:30 +09001422 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1423 if (!(ap->flags & ATA_FLAG_DISABLED))
Tejun Heo28ca5c52006-03-01 16:09:36 +09001424 classes[i] = ap->device[i].class;
Tejun Heof8c2c422006-05-15 20:57:30 +09001425 ap->device[i].class = ATA_DEV_UNKNOWN;
1426 }
Tejun Heo20444702006-03-13 01:57:01 +09001427
Tejun Heo28ca5c52006-03-01 16:09:36 +09001428 ata_port_probe(ap);
1429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
Tejun Heo20444702006-03-13 01:57:01 +09001431 for (i = 0; i < ATA_MAX_DEVICES; i++)
1432 if (classes[i] == ATA_DEV_UNKNOWN)
1433 classes[i] = ATA_DEV_NONE;
1434
Tejun Heo28ca5c52006-03-01 16:09:36 +09001435 /* read IDENTIFY page and configure devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001437 dev = &ap->device[i];
Tejun Heo28ca5c52006-03-01 16:09:36 +09001438
Tejun Heoec573752006-04-11 22:26:29 +09001439 if (tries[i])
1440 dev->class = classes[i];
Tejun Heo14d2bac2006-04-02 17:54:46 +09001441
Tejun Heoe1211e32006-04-01 01:38:18 +09001442 if (!ata_dev_enabled(dev))
Tejun Heoffeae412006-03-01 16:09:35 +09001443 continue;
1444
Tejun Heo3373efd2006-05-15 20:57:53 +09001445 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001446 if (rc)
1447 goto fail;
Tejun Heoffeae412006-03-01 16:09:35 +09001448
Tejun Heo3373efd2006-05-15 20:57:53 +09001449 rc = ata_dev_configure(dev, 1);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001450 if (rc)
1451 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 }
1453
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001454 /* configure transfer mode */
Tejun Heo3adcebb2006-05-15 20:57:37 +09001455 rc = ata_set_mode(ap, &dev);
Tejun Heo51713d32006-04-11 22:26:29 +09001456 if (rc) {
1457 down_xfermask = 1;
1458 goto fail;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001461 for (i = 0; i < ATA_MAX_DEVICES; i++)
1462 if (ata_dev_enabled(&ap->device[i]))
1463 return 0;
Alan Coxe35a9e02006-03-27 18:46:37 +01001464
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001465 /* no device present, disable port */
1466 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 ap->ops->port_disable(ap);
Tejun Heo96072e62006-04-01 01:38:17 +09001468 return -ENODEV;
Tejun Heo14d2bac2006-04-02 17:54:46 +09001469
1470 fail:
1471 switch (rc) {
1472 case -EINVAL:
1473 case -ENODEV:
1474 tries[dev->devno] = 0;
1475 break;
1476 case -EIO:
Tejun Heo3c567b72006-05-15 20:57:23 +09001477 sata_down_spd_limit(ap);
Tejun Heo14d2bac2006-04-02 17:54:46 +09001478 /* fall through */
1479 default:
1480 tries[dev->devno]--;
1481 if (down_xfermask &&
Tejun Heo3373efd2006-05-15 20:57:53 +09001482 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
Tejun Heo14d2bac2006-04-02 17:54:46 +09001483 tries[dev->devno] = 0;
1484 }
1485
Tejun Heoec573752006-04-11 22:26:29 +09001486 if (!tries[dev->devno]) {
Tejun Heo3373efd2006-05-15 20:57:53 +09001487 ata_down_xfermask_limit(dev, 1);
1488 ata_dev_disable(dev);
Tejun Heoec573752006-04-11 22:26:29 +09001489 }
1490
Tejun Heo14d2bac2006-04-02 17:54:46 +09001491 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492}
1493
1494/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001495 * ata_port_probe - Mark port as enabled
1496 * @ap: Port for which we indicate enablement
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001498 * Modify @ap data structure such that the system
1499 * thinks that the entire port is enabled.
1500 *
1501 * LOCKING: host_set lock, or some other form of
1502 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 */
1504
1505void ata_port_probe(struct ata_port *ap)
1506{
Tejun Heo198e0fe2006-04-02 18:51:52 +09001507 ap->flags &= ~ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508}
1509
1510/**
Tejun Heo3be680b2005-12-19 22:35:02 +09001511 * sata_print_link_status - Print SATA link status
1512 * @ap: SATA port to printk link status about
1513 *
1514 * This function prints link speed and status of a SATA link.
1515 *
1516 * LOCKING:
1517 * None.
1518 */
1519static void sata_print_link_status(struct ata_port *ap)
1520{
Tejun Heo6d5f9732006-04-03 00:09:41 +09001521 u32 sstatus, scontrol, tmp;
Tejun Heo3be680b2005-12-19 22:35:02 +09001522
Tejun Heo81952c52006-05-15 20:57:47 +09001523 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
Tejun Heo3be680b2005-12-19 22:35:02 +09001524 return;
Tejun Heo81952c52006-05-15 20:57:47 +09001525 sata_scr_read(ap, SCR_CONTROL, &scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001526
Tejun Heo81952c52006-05-15 20:57:47 +09001527 if (ata_port_online(ap)) {
Tejun Heo3be680b2005-12-19 22:35:02 +09001528 tmp = (sstatus >> 4) & 0xf;
Tejun Heof15a1da2006-05-15 20:57:56 +09001529 ata_port_printk(ap, KERN_INFO,
1530 "SATA link up %s (SStatus %X SControl %X)\n",
1531 sata_spd_string(tmp), sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001532 } else {
Tejun Heof15a1da2006-05-15 20:57:56 +09001533 ata_port_printk(ap, KERN_INFO,
1534 "SATA link down (SStatus %X SControl %X)\n",
1535 sstatus, scontrol);
Tejun Heo3be680b2005-12-19 22:35:02 +09001536 }
1537}
1538
1539/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001540 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1541 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001543 * This function issues commands to standard SATA Sxxx
1544 * PHY registers, to wake up the phy (and device), and
1545 * clear any reset condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 *
1547 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001548 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 *
1550 */
1551void __sata_phy_reset(struct ata_port *ap)
1552{
1553 u32 sstatus;
1554 unsigned long timeout = jiffies + (HZ * 5);
1555
1556 if (ap->flags & ATA_FLAG_SATA_RESET) {
Brett Russcdcca89e2005-03-28 15:10:27 -05001557 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09001558 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
Tejun Heo62ba2842005-06-26 23:27:19 +09001559 /* Couldn't find anything in SATA I/II specs, but
1560 * AHCI-1.1 10.4.2 says at least 1 ms. */
1561 mdelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 }
Tejun Heo81952c52006-05-15 20:57:47 +09001563 /* phy wake/clear reset */
1564 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
1566 /* wait for phy to become ready, if necessary */
1567 do {
1568 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09001569 sata_scr_read(ap, SCR_STATUS, &sstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 if ((sstatus & 0xf) != 1)
1571 break;
1572 } while (time_before(jiffies, timeout));
1573
Tejun Heo3be680b2005-12-19 22:35:02 +09001574 /* print link status */
1575 sata_print_link_status(ap);
Jeff Garzik656563e2005-11-20 03:36:45 -05001576
Tejun Heo3be680b2005-12-19 22:35:02 +09001577 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09001578 if (!ata_port_offline(ap))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 ata_port_probe(ap);
Tejun Heo3be680b2005-12-19 22:35:02 +09001580 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582
Tejun Heo198e0fe2006-04-02 18:51:52 +09001583 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 return;
1585
1586 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1587 ata_port_disable(ap);
1588 return;
1589 }
1590
1591 ap->cbl = ATA_CBL_SATA;
1592}
1593
1594/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001595 * sata_phy_reset - Reset SATA bus.
1596 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001598 * This function resets the SATA bus, and then probes
1599 * the bus for devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 *
1601 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001602 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 *
1604 */
1605void sata_phy_reset(struct ata_port *ap)
1606{
1607 __sata_phy_reset(ap);
Tejun Heo198e0fe2006-04-02 18:51:52 +09001608 if (ap->flags & ATA_FLAG_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 return;
1610 ata_bus_reset(ap);
1611}
1612
1613/**
Alan Coxebdfca62006-03-23 15:38:34 +00001614 * ata_dev_pair - return other device on cable
Alan Coxebdfca62006-03-23 15:38:34 +00001615 * @adev: device
1616 *
1617 * Obtain the other device on the same cable, or if none is
1618 * present NULL is returned
1619 */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001620
Tejun Heo3373efd2006-05-15 20:57:53 +09001621struct ata_device *ata_dev_pair(struct ata_device *adev)
Alan Coxebdfca62006-03-23 15:38:34 +00001622{
Tejun Heo3373efd2006-05-15 20:57:53 +09001623 struct ata_port *ap = adev->ap;
Alan Coxebdfca62006-03-23 15:38:34 +00001624 struct ata_device *pair = &ap->device[1 - adev->devno];
Tejun Heoe1211e32006-04-01 01:38:18 +09001625 if (!ata_dev_enabled(pair))
Alan Coxebdfca62006-03-23 15:38:34 +00001626 return NULL;
1627 return pair;
1628}
1629
1630/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001631 * ata_port_disable - Disable port.
1632 * @ap: Port to be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001634 * Modify @ap data structure such that the system
1635 * thinks that the entire port is disabled, and should
1636 * never attempt to probe or communicate with devices
1637 * on this port.
1638 *
1639 * LOCKING: host_set lock, or some other form of
1640 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 */
1642
1643void ata_port_disable(struct ata_port *ap)
1644{
1645 ap->device[0].class = ATA_DEV_NONE;
1646 ap->device[1].class = ATA_DEV_NONE;
Tejun Heo198e0fe2006-04-02 18:51:52 +09001647 ap->flags |= ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648}
1649
Tejun Heo1c3fae42006-04-02 20:53:28 +09001650/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001651 * sata_down_spd_limit - adjust SATA spd limit downward
Tejun Heo1c3fae42006-04-02 20:53:28 +09001652 * @ap: Port to adjust SATA spd limit for
1653 *
1654 * Adjust SATA spd limit of @ap downward. Note that this
1655 * function only adjusts the limit. The change must be applied
Tejun Heo3c567b72006-05-15 20:57:23 +09001656 * using sata_set_spd().
Tejun Heo1c3fae42006-04-02 20:53:28 +09001657 *
1658 * LOCKING:
1659 * Inherited from caller.
1660 *
1661 * RETURNS:
1662 * 0 on success, negative errno on failure
1663 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001664int sata_down_spd_limit(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001665{
Tejun Heo81952c52006-05-15 20:57:47 +09001666 u32 sstatus, spd, mask;
1667 int rc, highbit;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001668
Tejun Heo81952c52006-05-15 20:57:47 +09001669 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1670 if (rc)
1671 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001672
1673 mask = ap->sata_spd_limit;
1674 if (mask <= 1)
1675 return -EINVAL;
1676 highbit = fls(mask) - 1;
1677 mask &= ~(1 << highbit);
1678
Tejun Heo81952c52006-05-15 20:57:47 +09001679 spd = (sstatus >> 4) & 0xf;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001680 if (spd <= 1)
1681 return -EINVAL;
1682 spd--;
1683 mask &= (1 << spd) - 1;
1684 if (!mask)
1685 return -EINVAL;
1686
1687 ap->sata_spd_limit = mask;
1688
Tejun Heof15a1da2006-05-15 20:57:56 +09001689 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1690 sata_spd_string(fls(mask)));
Tejun Heo1c3fae42006-04-02 20:53:28 +09001691
1692 return 0;
1693}
1694
Tejun Heo3c567b72006-05-15 20:57:23 +09001695static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001696{
1697 u32 spd, limit;
1698
1699 if (ap->sata_spd_limit == UINT_MAX)
1700 limit = 0;
1701 else
1702 limit = fls(ap->sata_spd_limit);
1703
1704 spd = (*scontrol >> 4) & 0xf;
1705 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1706
1707 return spd != limit;
1708}
1709
1710/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001711 * sata_set_spd_needed - is SATA spd configuration needed
Tejun Heo1c3fae42006-04-02 20:53:28 +09001712 * @ap: Port in question
1713 *
1714 * Test whether the spd limit in SControl matches
1715 * @ap->sata_spd_limit. This function is used to determine
1716 * whether hardreset is necessary to apply SATA spd
1717 * configuration.
1718 *
1719 * LOCKING:
1720 * Inherited from caller.
1721 *
1722 * RETURNS:
1723 * 1 if SATA spd configuration is needed, 0 otherwise.
1724 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001725int sata_set_spd_needed(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001726{
1727 u32 scontrol;
1728
Tejun Heo81952c52006-05-15 20:57:47 +09001729 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09001730 return 0;
1731
Tejun Heo3c567b72006-05-15 20:57:23 +09001732 return __sata_set_spd_needed(ap, &scontrol);
Tejun Heo1c3fae42006-04-02 20:53:28 +09001733}
1734
1735/**
Tejun Heo3c567b72006-05-15 20:57:23 +09001736 * sata_set_spd - set SATA spd according to spd limit
Tejun Heo1c3fae42006-04-02 20:53:28 +09001737 * @ap: Port to set SATA spd for
1738 *
1739 * Set SATA spd of @ap according to sata_spd_limit.
1740 *
1741 * LOCKING:
1742 * Inherited from caller.
1743 *
1744 * RETURNS:
1745 * 0 if spd doesn't need to be changed, 1 if spd has been
Tejun Heo81952c52006-05-15 20:57:47 +09001746 * changed. Negative errno if SCR registers are inaccessible.
Tejun Heo1c3fae42006-04-02 20:53:28 +09001747 */
Tejun Heo3c567b72006-05-15 20:57:23 +09001748int sata_set_spd(struct ata_port *ap)
Tejun Heo1c3fae42006-04-02 20:53:28 +09001749{
1750 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09001751 int rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001752
Tejun Heo81952c52006-05-15 20:57:47 +09001753 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1754 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09001755
Tejun Heo3c567b72006-05-15 20:57:23 +09001756 if (!__sata_set_spd_needed(ap, &scontrol))
Tejun Heo1c3fae42006-04-02 20:53:28 +09001757 return 0;
1758
Tejun Heo81952c52006-05-15 20:57:47 +09001759 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1760 return rc;
1761
Tejun Heo1c3fae42006-04-02 20:53:28 +09001762 return 1;
1763}
1764
Alan Cox452503f2005-10-21 19:01:32 -04001765/*
1766 * This mode timing computation functionality is ported over from
1767 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1768 */
1769/*
1770 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1771 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1772 * for PIO 5, which is a nonstandard extension and UDMA6, which
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001773 * is currently supported only by Maxtor drives.
Alan Cox452503f2005-10-21 19:01:32 -04001774 */
1775
1776static const struct ata_timing ata_timing[] = {
1777
1778 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1779 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1780 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1781 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1782
1783 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1784 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1785 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1786
1787/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001788
Alan Cox452503f2005-10-21 19:01:32 -04001789 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1790 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1791 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001792
Alan Cox452503f2005-10-21 19:01:32 -04001793 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1794 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1795 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1796
1797/* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1798 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1799 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1800
1801 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1802 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1803 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1804
1805/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1806
1807 { 0xFF }
1808};
1809
1810#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1811#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1812
1813static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1814{
1815 q->setup = EZ(t->setup * 1000, T);
1816 q->act8b = EZ(t->act8b * 1000, T);
1817 q->rec8b = EZ(t->rec8b * 1000, T);
1818 q->cyc8b = EZ(t->cyc8b * 1000, T);
1819 q->active = EZ(t->active * 1000, T);
1820 q->recover = EZ(t->recover * 1000, T);
1821 q->cycle = EZ(t->cycle * 1000, T);
1822 q->udma = EZ(t->udma * 1000, UT);
1823}
1824
1825void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1826 struct ata_timing *m, unsigned int what)
1827{
1828 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1829 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1830 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1831 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1832 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1833 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1834 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1835 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1836}
1837
1838static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1839{
1840 const struct ata_timing *t;
1841
1842 for (t = ata_timing; t->mode != speed; t++)
Alan Cox91190752005-10-26 12:17:46 -04001843 if (t->mode == 0xFF)
Alan Cox452503f2005-10-21 19:01:32 -04001844 return NULL;
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001845 return t;
Alan Cox452503f2005-10-21 19:01:32 -04001846}
1847
1848int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1849 struct ata_timing *t, int T, int UT)
1850{
1851 const struct ata_timing *s;
1852 struct ata_timing p;
1853
1854 /*
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05001855 * Find the mode.
Albert Lee75b1f2f2005-11-16 17:06:18 +08001856 */
Alan Cox452503f2005-10-21 19:01:32 -04001857
1858 if (!(s = ata_timing_find_mode(speed)))
1859 return -EINVAL;
1860
Albert Lee75b1f2f2005-11-16 17:06:18 +08001861 memcpy(t, s, sizeof(*s));
1862
Alan Cox452503f2005-10-21 19:01:32 -04001863 /*
1864 * If the drive is an EIDE drive, it can tell us it needs extended
1865 * PIO/MW_DMA cycle timing.
1866 */
1867
1868 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1869 memset(&p, 0, sizeof(p));
1870 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1871 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1872 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1873 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1874 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1875 }
1876 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1877 }
1878
1879 /*
1880 * Convert the timing to bus clock counts.
1881 */
1882
Albert Lee75b1f2f2005-11-16 17:06:18 +08001883 ata_timing_quantize(t, t, T, UT);
Alan Cox452503f2005-10-21 19:01:32 -04001884
1885 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001886 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1887 * S.M.A.R.T * and some other commands. We have to ensure that the
1888 * DMA cycle timing is slower/equal than the fastest PIO timing.
Alan Cox452503f2005-10-21 19:01:32 -04001889 */
1890
1891 if (speed > XFER_PIO_4) {
1892 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1893 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1894 }
1895
1896 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001897 * Lengthen active & recovery time so that cycle time is correct.
Alan Cox452503f2005-10-21 19:01:32 -04001898 */
1899
1900 if (t->act8b + t->rec8b < t->cyc8b) {
1901 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1902 t->rec8b = t->cyc8b - t->act8b;
1903 }
1904
1905 if (t->active + t->recover < t->cycle) {
1906 t->active += (t->cycle - (t->active + t->recover)) / 2;
1907 t->recover = t->cycle - t->active;
1908 }
1909
1910 return 0;
1911}
1912
Tejun Heocf176e12006-04-02 17:54:46 +09001913/**
1914 * ata_down_xfermask_limit - adjust dev xfer masks downward
Tejun Heocf176e12006-04-02 17:54:46 +09001915 * @dev: Device to adjust xfer masks
1916 * @force_pio0: Force PIO0
1917 *
1918 * Adjust xfer masks of @dev downward. Note that this function
1919 * does not apply the change. Invoking ata_set_mode() afterwards
1920 * will apply the limit.
1921 *
1922 * LOCKING:
1923 * Inherited from caller.
1924 *
1925 * RETURNS:
1926 * 0 on success, negative errno on failure
1927 */
Tejun Heo3373efd2006-05-15 20:57:53 +09001928int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
Tejun Heocf176e12006-04-02 17:54:46 +09001929{
1930 unsigned long xfer_mask;
1931 int highbit;
1932
1933 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1934 dev->udma_mask);
1935
1936 if (!xfer_mask)
1937 goto fail;
1938 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1939 if (xfer_mask & ATA_MASK_UDMA)
1940 xfer_mask &= ~ATA_MASK_MWDMA;
1941
1942 highbit = fls(xfer_mask) - 1;
1943 xfer_mask &= ~(1 << highbit);
1944 if (force_pio0)
1945 xfer_mask &= 1 << ATA_SHIFT_PIO;
1946 if (!xfer_mask)
1947 goto fail;
1948
1949 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1950 &dev->udma_mask);
1951
Tejun Heof15a1da2006-05-15 20:57:56 +09001952 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
1953 ata_mode_string(xfer_mask));
Tejun Heocf176e12006-04-02 17:54:46 +09001954
1955 return 0;
1956
1957 fail:
1958 return -EINVAL;
1959}
1960
Tejun Heo3373efd2006-05-15 20:57:53 +09001961static int ata_dev_set_mode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962{
Tejun Heo83206a22006-03-24 15:25:31 +09001963 unsigned int err_mask;
1964 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965
Tejun Heoe8384602006-04-02 18:51:53 +09001966 dev->flags &= ~ATA_DFLAG_PIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 if (dev->xfer_shift == ATA_SHIFT_PIO)
1968 dev->flags |= ATA_DFLAG_PIO;
1969
Tejun Heo3373efd2006-05-15 20:57:53 +09001970 err_mask = ata_dev_set_xfermode(dev);
Tejun Heo83206a22006-03-24 15:25:31 +09001971 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09001972 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
1973 "(err_mask=0x%x)\n", err_mask);
Tejun Heo83206a22006-03-24 15:25:31 +09001974 return -EIO;
1975 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
Tejun Heo3373efd2006-05-15 20:57:53 +09001977 rc = ata_dev_revalidate(dev, 0);
Tejun Heo5eb45c02006-04-02 18:51:52 +09001978 if (rc)
Tejun Heo83206a22006-03-24 15:25:31 +09001979 return rc;
Tejun Heo48a8a142006-03-05 17:55:58 +09001980
Tejun Heo23e71c32006-03-06 04:31:57 +09001981 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1982 dev->xfer_shift, (int)dev->xfer_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983
Tejun Heof15a1da2006-05-15 20:57:56 +09001984 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1985 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
Tejun Heo83206a22006-03-24 15:25:31 +09001986 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987}
1988
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989/**
1990 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1991 * @ap: port on which timings will be programmed
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001992 * @r_failed_dev: out paramter for failed device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 *
Tejun Heoe82cbdb2006-04-01 01:38:18 +09001994 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1995 * ata_set_mode() fails, pointer to the failing device is
1996 * returned in @r_failed_dev.
Jeff Garzik780a87f2005-05-30 15:41:05 -04001997 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001999 * PCI/etc. bus probe sem.
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002000 *
2001 * RETURNS:
2002 * 0 on success, negative errno otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 */
Tejun Heo1ad8e7f2006-04-02 18:51:53 +09002004int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005{
Tejun Heoe8e06192006-04-01 01:38:18 +09002006 struct ata_device *dev;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002007 int i, rc = 0, used_dma = 0, found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008
Tejun Heo3adcebb2006-05-15 20:57:37 +09002009 /* has private set_mode? */
2010 if (ap->ops->set_mode) {
2011 /* FIXME: make ->set_mode handle no device case and
2012 * return error code and failing device on failure.
2013 */
2014 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2015 if (ata_dev_enabled(&ap->device[i])) {
2016 ap->ops->set_mode(ap);
2017 break;
2018 }
2019 }
2020 return 0;
2021 }
2022
Tejun Heoa6d5a512006-03-06 04:31:57 +09002023 /* step 1: calculate xfer_mask */
2024 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoacf356b2006-03-24 14:07:50 +09002025 unsigned int pio_mask, dma_mask;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002026
Tejun Heoe8e06192006-04-01 01:38:18 +09002027 dev = &ap->device[i];
2028
Tejun Heoe1211e32006-04-01 01:38:18 +09002029 if (!ata_dev_enabled(dev))
Tejun Heoa6d5a512006-03-06 04:31:57 +09002030 continue;
2031
Tejun Heo3373efd2006-05-15 20:57:53 +09002032 ata_dev_xfermask(dev);
Tejun Heoa6d5a512006-03-06 04:31:57 +09002033
Tejun Heoacf356b2006-03-24 14:07:50 +09002034 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2035 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2036 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2037 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
Alan Cox5444a6f2006-03-27 18:58:20 +01002038
Tejun Heo4f659772006-04-01 01:38:18 +09002039 found = 1;
Alan Cox5444a6f2006-03-27 18:58:20 +01002040 if (dev->dma_mode)
2041 used_dma = 1;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002042 }
Tejun Heo4f659772006-04-01 01:38:18 +09002043 if (!found)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002044 goto out;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002045
2046 /* step 2: always set host PIO timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002047 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2048 dev = &ap->device[i];
2049 if (!ata_dev_enabled(dev))
2050 continue;
2051
2052 if (!dev->pio_mode) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002053 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
Tejun Heoe8e06192006-04-01 01:38:18 +09002054 rc = -EINVAL;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002055 goto out;
Tejun Heoe8e06192006-04-01 01:38:18 +09002056 }
2057
2058 dev->xfer_mode = dev->pio_mode;
2059 dev->xfer_shift = ATA_SHIFT_PIO;
2060 if (ap->ops->set_piomode)
2061 ap->ops->set_piomode(ap, dev);
2062 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063
Tejun Heoa6d5a512006-03-06 04:31:57 +09002064 /* step 3: set host DMA timings */
Tejun Heoe8e06192006-04-01 01:38:18 +09002065 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2066 dev = &ap->device[i];
2067
2068 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2069 continue;
2070
2071 dev->xfer_mode = dev->dma_mode;
2072 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2073 if (ap->ops->set_dmamode)
2074 ap->ops->set_dmamode(ap, dev);
2075 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
2077 /* step 4: update devices' xfer mode */
Tejun Heo83206a22006-03-24 15:25:31 +09002078 for (i = 0; i < ATA_MAX_DEVICES; i++) {
Tejun Heoe8e06192006-04-01 01:38:18 +09002079 dev = &ap->device[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080
Tejun Heoe1211e32006-04-01 01:38:18 +09002081 if (!ata_dev_enabled(dev))
Tejun Heo83206a22006-03-24 15:25:31 +09002082 continue;
2083
Tejun Heo3373efd2006-05-15 20:57:53 +09002084 rc = ata_dev_set_mode(dev);
Tejun Heo5bbc53f2006-04-01 01:38:17 +09002085 if (rc)
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002086 goto out;
Tejun Heo83206a22006-03-24 15:25:31 +09002087 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Tejun Heoe8e06192006-04-01 01:38:18 +09002089 /* Record simplex status. If we selected DMA then the other
2090 * host channels are not permitted to do so.
Alan Cox5444a6f2006-03-27 18:58:20 +01002091 */
Alan Cox5444a6f2006-03-27 18:58:20 +01002092 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2093 ap->host_set->simplex_claimed = 1;
2094
Tejun Heoe8e06192006-04-01 01:38:18 +09002095 /* step5: chip specific finalisation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 if (ap->ops->post_set_mode)
2097 ap->ops->post_set_mode(ap);
2098
Tejun Heoe82cbdb2006-04-01 01:38:18 +09002099 out:
2100 if (rc)
2101 *r_failed_dev = dev;
2102 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103}
2104
2105/**
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05002106 * ata_tf_to_host - issue ATA taskfile to host controller
2107 * @ap: port to which command is being issued
2108 * @tf: ATA taskfile register set
2109 *
2110 * Issues ATA taskfile register set to ATA host controller,
2111 * with proper synchronization with interrupt handler and
2112 * other threads.
2113 *
2114 * LOCKING:
2115 * spin_lock_irqsave(host_set lock)
2116 */
2117
2118static inline void ata_tf_to_host(struct ata_port *ap,
2119 const struct ata_taskfile *tf)
2120{
2121 ap->ops->tf_load(ap, tf);
2122 ap->ops->exec_command(ap, tf);
2123}
2124
2125/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 * ata_busy_sleep - sleep until BSY clears, or timeout
2127 * @ap: port containing status register to be polled
2128 * @tmout_pat: impatience timeout
2129 * @tmout: overall timeout
2130 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002131 * Sleep until ATA Status register bit BSY clears,
2132 * or a timeout occurs.
2133 *
2134 * LOCKING: None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 */
2136
Tejun Heo6f8b9952006-01-24 17:05:21 +09002137unsigned int ata_busy_sleep (struct ata_port *ap,
2138 unsigned long tmout_pat, unsigned long tmout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139{
2140 unsigned long timer_start, timeout;
2141 u8 status;
2142
2143 status = ata_busy_wait(ap, ATA_BUSY, 300);
2144 timer_start = jiffies;
2145 timeout = timer_start + tmout_pat;
2146 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2147 msleep(50);
2148 status = ata_busy_wait(ap, ATA_BUSY, 3);
2149 }
2150
2151 if (status & ATA_BUSY)
Tejun Heof15a1da2006-05-15 20:57:56 +09002152 ata_port_printk(ap, KERN_WARNING,
2153 "port is slow to respond, please be patient\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154
2155 timeout = timer_start + tmout;
2156 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2157 msleep(50);
2158 status = ata_chk_status(ap);
2159 }
2160
2161 if (status & ATA_BUSY) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002162 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2163 "(%lu secs)\n", tmout / HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 return 1;
2165 }
2166
2167 return 0;
2168}
2169
2170static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2171{
2172 struct ata_ioports *ioaddr = &ap->ioaddr;
2173 unsigned int dev0 = devmask & (1 << 0);
2174 unsigned int dev1 = devmask & (1 << 1);
2175 unsigned long timeout;
2176
2177 /* if device 0 was found in ata_devchk, wait for its
2178 * BSY bit to clear
2179 */
2180 if (dev0)
2181 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2182
2183 /* if device 1 was found in ata_devchk, wait for
2184 * register access, then wait for BSY to clear
2185 */
2186 timeout = jiffies + ATA_TMOUT_BOOT;
2187 while (dev1) {
2188 u8 nsect, lbal;
2189
2190 ap->ops->dev_select(ap, 1);
2191 if (ap->flags & ATA_FLAG_MMIO) {
2192 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2193 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2194 } else {
2195 nsect = inb(ioaddr->nsect_addr);
2196 lbal = inb(ioaddr->lbal_addr);
2197 }
2198 if ((nsect == 1) && (lbal == 1))
2199 break;
2200 if (time_after(jiffies, timeout)) {
2201 dev1 = 0;
2202 break;
2203 }
2204 msleep(50); /* give drive a breather */
2205 }
2206 if (dev1)
2207 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2208
2209 /* is all this really necessary? */
2210 ap->ops->dev_select(ap, 0);
2211 if (dev1)
2212 ap->ops->dev_select(ap, 1);
2213 if (dev0)
2214 ap->ops->dev_select(ap, 0);
2215}
2216
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217static unsigned int ata_bus_softreset(struct ata_port *ap,
2218 unsigned int devmask)
2219{
2220 struct ata_ioports *ioaddr = &ap->ioaddr;
2221
2222 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2223
2224 /* software reset. causes dev0 to be selected */
2225 if (ap->flags & ATA_FLAG_MMIO) {
2226 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2227 udelay(20); /* FIXME: flush */
2228 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2229 udelay(20); /* FIXME: flush */
2230 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2231 } else {
2232 outb(ap->ctl, ioaddr->ctl_addr);
2233 udelay(10);
2234 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2235 udelay(10);
2236 outb(ap->ctl, ioaddr->ctl_addr);
2237 }
2238
2239 /* spec mandates ">= 2ms" before checking status.
2240 * We wait 150ms, because that was the magic delay used for
2241 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2242 * between when the ATA command register is written, and then
2243 * status is checked. Because waiting for "a while" before
2244 * checking status is fine, post SRST, we perform this magic
2245 * delay here as well.
Alan Cox09c7ad72006-03-22 15:52:40 +00002246 *
2247 * Old drivers/ide uses the 2mS rule and then waits for ready
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 */
2249 msleep(150);
2250
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002251 /* Before we perform post reset processing we want to see if
Tejun Heo298a41c2006-03-25 02:58:13 +09002252 * the bus shows 0xFF because the odd clown forgets the D7
2253 * pulldown resistor.
2254 */
Tejun Heo987d2f02006-04-11 22:16:45 +09002255 if (ata_check_status(ap) == 0xFF) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002256 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
Tejun Heo298a41c2006-03-25 02:58:13 +09002257 return AC_ERR_OTHER;
Tejun Heo987d2f02006-04-11 22:16:45 +09002258 }
Alan Cox09c7ad72006-03-22 15:52:40 +00002259
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 ata_bus_post_reset(ap, devmask);
2261
2262 return 0;
2263}
2264
2265/**
2266 * ata_bus_reset - reset host port and associated ATA channel
2267 * @ap: port to reset
2268 *
2269 * This is typically the first time we actually start issuing
2270 * commands to the ATA channel. We wait for BSY to clear, then
2271 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2272 * result. Determine what devices, if any, are on the channel
2273 * by looking at the device 0/1 error register. Look at the signature
2274 * stored in each device's taskfile registers, to determine if
2275 * the device is ATA or ATAPI.
2276 *
2277 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002278 * PCI/etc. bus probe sem.
2279 * Obtains host_set lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 *
2281 * SIDE EFFECTS:
Tejun Heo198e0fe2006-04-02 18:51:52 +09002282 * Sets ATA_FLAG_DISABLED if bus reset fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 */
2284
2285void ata_bus_reset(struct ata_port *ap)
2286{
2287 struct ata_ioports *ioaddr = &ap->ioaddr;
2288 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2289 u8 err;
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002290 unsigned int dev0, dev1 = 0, devmask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291
2292 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2293
2294 /* determine if device 0/1 are present */
2295 if (ap->flags & ATA_FLAG_SATA_RESET)
2296 dev0 = 1;
2297 else {
2298 dev0 = ata_devchk(ap, 0);
2299 if (slave_possible)
2300 dev1 = ata_devchk(ap, 1);
2301 }
2302
2303 if (dev0)
2304 devmask |= (1 << 0);
2305 if (dev1)
2306 devmask |= (1 << 1);
2307
2308 /* select device 0 again */
2309 ap->ops->dev_select(ap, 0);
2310
2311 /* issue bus reset */
2312 if (ap->flags & ATA_FLAG_SRST)
Tejun Heoaec5c3c2006-03-25 01:33:34 +09002313 if (ata_bus_softreset(ap, devmask))
2314 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315
2316 /*
2317 * determine by signature whether we have ATA or ATAPI devices
2318 */
Tejun Heob4dc7622006-01-24 17:05:22 +09002319 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320 if ((slave_possible) && (err != 0x81))
Tejun Heob4dc7622006-01-24 17:05:22 +09002321 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322
2323 /* re-enable interrupts */
2324 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2325 ata_irq_on(ap);
2326
2327 /* is double-select really necessary? */
2328 if (ap->device[1].class != ATA_DEV_NONE)
2329 ap->ops->dev_select(ap, 1);
2330 if (ap->device[0].class != ATA_DEV_NONE)
2331 ap->ops->dev_select(ap, 0);
2332
2333 /* if no devices were detected, disable this port */
2334 if ((ap->device[0].class == ATA_DEV_NONE) &&
2335 (ap->device[1].class == ATA_DEV_NONE))
2336 goto err_out;
2337
2338 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2339 /* set up device control for ATA_FLAG_SATA_RESET */
2340 if (ap->flags & ATA_FLAG_MMIO)
2341 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2342 else
2343 outb(ap->ctl, ioaddr->ctl_addr);
2344 }
2345
2346 DPRINTK("EXIT\n");
2347 return;
2348
2349err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09002350 ata_port_printk(ap, KERN_ERR, "disabling port\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002351 ap->ops->port_disable(ap);
2352
2353 DPRINTK("EXIT\n");
2354}
2355
Tejun Heo7a7921e2006-02-02 18:20:00 +09002356static int sata_phy_resume(struct ata_port *ap)
2357{
2358 unsigned long timeout = jiffies + (HZ * 5);
Tejun Heo852ee162006-04-01 01:38:18 +09002359 u32 scontrol, sstatus;
Tejun Heo81952c52006-05-15 20:57:47 +09002360 int rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002361
Tejun Heo81952c52006-05-15 20:57:47 +09002362 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2363 return rc;
2364
Tejun Heo852ee162006-04-01 01:38:18 +09002365 scontrol = (scontrol & 0x0f0) | 0x300;
Tejun Heo81952c52006-05-15 20:57:47 +09002366
2367 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2368 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002369
2370 /* Wait for phy to become ready, if necessary. */
2371 do {
2372 msleep(200);
Tejun Heo81952c52006-05-15 20:57:47 +09002373 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2374 return rc;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002375 if ((sstatus & 0xf) != 1)
2376 return 0;
2377 } while (time_before(jiffies, timeout));
2378
Tejun Heo81952c52006-05-15 20:57:47 +09002379 return -EBUSY;
Tejun Heo7a7921e2006-02-02 18:20:00 +09002380}
2381
Tejun Heoc2bd5802006-01-24 17:05:22 +09002382/**
Tejun Heo8a19ac82006-02-02 18:20:00 +09002383 * ata_std_probeinit - initialize probing
2384 * @ap: port to be probed
2385 *
2386 * @ap is about to be probed. Initialize it. This function is
2387 * to be used as standard callback for ata_drive_probe_reset().
Tejun Heo3a397462006-02-10 23:58:48 +09002388 *
2389 * NOTE!!! Do not use this function as probeinit if a low level
2390 * driver implements only hardreset. Just pass NULL as probeinit
2391 * in that case. Using this function is probably okay but doing
2392 * so makes reset sequence different from the original
2393 * ->phy_reset implementation and Jeff nervous. :-P
Tejun Heo8a19ac82006-02-02 18:20:00 +09002394 */
Alan Cox17efc5f2006-03-27 19:01:32 +01002395void ata_std_probeinit(struct ata_port *ap)
Tejun Heo8a19ac82006-02-02 18:20:00 +09002396{
Tejun Heo81952c52006-05-15 20:57:47 +09002397 u32 scontrol;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002398
Tejun Heo81952c52006-05-15 20:57:47 +09002399 /* resume link */
2400 sata_phy_resume(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002401
Tejun Heo81952c52006-05-15 20:57:47 +09002402 /* init sata_spd_limit to the current value */
2403 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2404 int spd = (scontrol >> 4) & 0xf;
2405 ap->sata_spd_limit &= (1 << spd) - 1;
Tejun Heo3a397462006-02-10 23:58:48 +09002406 }
Tejun Heo81952c52006-05-15 20:57:47 +09002407
2408 /* wait for device */
2409 if (ata_port_online(ap))
2410 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
Tejun Heo8a19ac82006-02-02 18:20:00 +09002411}
2412
2413/**
Tejun Heoc2bd5802006-01-24 17:05:22 +09002414 * ata_std_softreset - reset host port via ATA SRST
2415 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002416 * @classes: resulting classes of attached devices
2417 *
2418 * Reset host port using ATA SRST. This function is to be used
2419 * as standard callback for ata_drive_*_reset() functions.
2420 *
2421 * LOCKING:
2422 * Kernel thread context (may sleep)
2423 *
2424 * RETURNS:
2425 * 0 on success, -errno otherwise.
2426 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002427int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002428{
2429 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2430 unsigned int devmask = 0, err_mask;
2431 u8 err;
2432
2433 DPRINTK("ENTER\n");
2434
Tejun Heo81952c52006-05-15 20:57:47 +09002435 if (ata_port_offline(ap)) {
Tejun Heo3a397462006-02-10 23:58:48 +09002436 classes[0] = ATA_DEV_NONE;
2437 goto out;
2438 }
2439
Tejun Heoc2bd5802006-01-24 17:05:22 +09002440 /* determine if device 0/1 are present */
2441 if (ata_devchk(ap, 0))
2442 devmask |= (1 << 0);
2443 if (slave_possible && ata_devchk(ap, 1))
2444 devmask |= (1 << 1);
2445
Tejun Heoc2bd5802006-01-24 17:05:22 +09002446 /* select device 0 again */
2447 ap->ops->dev_select(ap, 0);
2448
2449 /* issue bus reset */
2450 DPRINTK("about to softreset, devmask=%x\n", devmask);
2451 err_mask = ata_bus_softreset(ap, devmask);
2452 if (err_mask) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002453 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2454 err_mask);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002455 return -EIO;
2456 }
2457
2458 /* determine by signature whether we have ATA or ATAPI devices */
2459 classes[0] = ata_dev_try_classify(ap, 0, &err);
2460 if (slave_possible && err != 0x81)
2461 classes[1] = ata_dev_try_classify(ap, 1, &err);
2462
Tejun Heo3a397462006-02-10 23:58:48 +09002463 out:
Tejun Heoc2bd5802006-01-24 17:05:22 +09002464 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2465 return 0;
2466}
2467
2468/**
2469 * sata_std_hardreset - reset host port via SATA phy reset
2470 * @ap: port to reset
Tejun Heoc2bd5802006-01-24 17:05:22 +09002471 * @class: resulting class of attached device
2472 *
2473 * SATA phy-reset host port using DET bits of SControl register.
2474 * This function is to be used as standard callback for
2475 * ata_drive_*_reset().
2476 *
2477 * LOCKING:
2478 * Kernel thread context (may sleep)
2479 *
2480 * RETURNS:
2481 * 0 on success, -errno otherwise.
2482 */
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002483int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002484{
Tejun Heo852ee162006-04-01 01:38:18 +09002485 u32 scontrol;
Tejun Heo81952c52006-05-15 20:57:47 +09002486 int rc;
Tejun Heo852ee162006-04-01 01:38:18 +09002487
Tejun Heoc2bd5802006-01-24 17:05:22 +09002488 DPRINTK("ENTER\n");
2489
Tejun Heo3c567b72006-05-15 20:57:23 +09002490 if (sata_set_spd_needed(ap)) {
Tejun Heo1c3fae42006-04-02 20:53:28 +09002491 /* SATA spec says nothing about how to reconfigure
2492 * spd. To be on the safe side, turn off phy during
2493 * reconfiguration. This works for at least ICH7 AHCI
2494 * and Sil3124.
2495 */
Tejun Heo81952c52006-05-15 20:57:47 +09002496 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2497 return rc;
2498
Tejun Heo1c3fae42006-04-02 20:53:28 +09002499 scontrol = (scontrol & 0x0f0) | 0x302;
Tejun Heo81952c52006-05-15 20:57:47 +09002500
2501 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2502 return rc;
Tejun Heo1c3fae42006-04-02 20:53:28 +09002503
Tejun Heo3c567b72006-05-15 20:57:23 +09002504 sata_set_spd(ap);
Tejun Heo1c3fae42006-04-02 20:53:28 +09002505 }
2506
2507 /* issue phy wake/reset */
Tejun Heo81952c52006-05-15 20:57:47 +09002508 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2509 return rc;
2510
Tejun Heo852ee162006-04-01 01:38:18 +09002511 scontrol = (scontrol & 0x0f0) | 0x301;
Tejun Heo81952c52006-05-15 20:57:47 +09002512
2513 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2514 return rc;
Tejun Heoc2bd5802006-01-24 17:05:22 +09002515
Tejun Heo1c3fae42006-04-02 20:53:28 +09002516 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
Tejun Heoc2bd5802006-01-24 17:05:22 +09002517 * 10.4.2 says at least 1 ms.
2518 */
2519 msleep(1);
2520
Tejun Heo1c3fae42006-04-02 20:53:28 +09002521 /* bring phy back */
Tejun Heo7a7921e2006-02-02 18:20:00 +09002522 sata_phy_resume(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002523
Tejun Heoc2bd5802006-01-24 17:05:22 +09002524 /* TODO: phy layer with polling, timeouts, etc. */
Tejun Heo81952c52006-05-15 20:57:47 +09002525 if (ata_port_offline(ap)) {
Tejun Heoc2bd5802006-01-24 17:05:22 +09002526 *class = ATA_DEV_NONE;
2527 DPRINTK("EXIT, link offline\n");
2528 return 0;
2529 }
2530
2531 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002532 ata_port_printk(ap, KERN_ERR,
2533 "COMRESET failed (device not ready)\n");
Tejun Heoc2bd5802006-01-24 17:05:22 +09002534 return -EIO;
2535 }
2536
Tejun Heo3a397462006-02-10 23:58:48 +09002537 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2538
Tejun Heoc2bd5802006-01-24 17:05:22 +09002539 *class = ata_dev_try_classify(ap, 0, NULL);
2540
2541 DPRINTK("EXIT, class=%u\n", *class);
2542 return 0;
2543}
2544
2545/**
2546 * ata_std_postreset - standard postreset callback
2547 * @ap: the target ata_port
2548 * @classes: classes of attached devices
2549 *
2550 * This function is invoked after a successful reset. Note that
2551 * the device might have been reset more than once using
2552 * different reset methods before postreset is invoked.
Tejun Heoc2bd5802006-01-24 17:05:22 +09002553 *
2554 * This function is to be used as standard callback for
2555 * ata_drive_*_reset().
2556 *
2557 * LOCKING:
2558 * Kernel thread context (may sleep)
2559 */
2560void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2561{
Tejun Heodc2b3512006-05-15 20:58:00 +09002562 u32 serror;
2563
Tejun Heoc2bd5802006-01-24 17:05:22 +09002564 DPRINTK("ENTER\n");
2565
Tejun Heoc2bd5802006-01-24 17:05:22 +09002566 /* print link status */
Tejun Heo81952c52006-05-15 20:57:47 +09002567 sata_print_link_status(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002568
Tejun Heodc2b3512006-05-15 20:58:00 +09002569 /* clear SError */
2570 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
2571 sata_scr_write(ap, SCR_ERROR, serror);
2572
Tejun Heo3a397462006-02-10 23:58:48 +09002573 /* re-enable interrupts */
Tejun Heoe3180492006-05-15 20:58:09 +09002574 if (!ap->ops->error_handler) {
2575 /* FIXME: hack. create a hook instead */
2576 if (ap->ioaddr.ctl_addr)
2577 ata_irq_on(ap);
2578 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09002579
2580 /* is double-select really necessary? */
2581 if (classes[0] != ATA_DEV_NONE)
2582 ap->ops->dev_select(ap, 1);
2583 if (classes[1] != ATA_DEV_NONE)
2584 ap->ops->dev_select(ap, 0);
2585
Tejun Heo3a397462006-02-10 23:58:48 +09002586 /* bail out if no device is present */
2587 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2588 DPRINTK("EXIT, no device\n");
2589 return;
2590 }
2591
2592 /* set up device control */
2593 if (ap->ioaddr.ctl_addr) {
2594 if (ap->flags & ATA_FLAG_MMIO)
2595 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2596 else
2597 outb(ap->ctl, ap->ioaddr.ctl_addr);
2598 }
Tejun Heoc2bd5802006-01-24 17:05:22 +09002599
2600 DPRINTK("EXIT\n");
2601}
2602
2603/**
2604 * ata_std_probe_reset - standard probe reset method
2605 * @ap: prot to perform probe-reset
2606 * @classes: resulting classes of attached devices
2607 *
2608 * The stock off-the-shelf ->probe_reset method.
2609 *
2610 * LOCKING:
2611 * Kernel thread context (may sleep)
2612 *
2613 * RETURNS:
2614 * 0 on success, -errno otherwise.
2615 */
2616int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2617{
2618 ata_reset_fn_t hardreset;
2619
2620 hardreset = NULL;
Tejun Heo81952c52006-05-15 20:57:47 +09002621 if (sata_scr_valid(ap))
Tejun Heoc2bd5802006-01-24 17:05:22 +09002622 hardreset = sata_std_hardreset;
2623
Tejun Heo8a19ac82006-02-02 18:20:00 +09002624 return ata_drive_probe_reset(ap, ata_std_probeinit,
Tejun Heo7944ea92006-02-02 18:20:00 +09002625 ata_std_softreset, hardreset,
Tejun Heoc2bd5802006-01-24 17:05:22 +09002626 ata_std_postreset, classes);
2627}
2628
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002629int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
Tejun Heo96bd39e2006-05-15 20:57:38 +09002630 unsigned int *classes)
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002631{
2632 int i, rc;
2633
2634 for (i = 0; i < ATA_MAX_DEVICES; i++)
2635 classes[i] = ATA_DEV_UNKNOWN;
2636
Tejun Heo2bf2cb22006-04-11 22:16:45 +09002637 rc = reset(ap, classes);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002638 if (rc)
2639 return rc;
2640
2641 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2642 * is complete and convert all ATA_DEV_UNKNOWN to
2643 * ATA_DEV_NONE.
2644 */
2645 for (i = 0; i < ATA_MAX_DEVICES; i++)
2646 if (classes[i] != ATA_DEV_UNKNOWN)
2647 break;
2648
2649 if (i < ATA_MAX_DEVICES)
2650 for (i = 0; i < ATA_MAX_DEVICES; i++)
2651 if (classes[i] == ATA_DEV_UNKNOWN)
2652 classes[i] = ATA_DEV_NONE;
2653
Tejun Heo9974e7c2006-04-01 01:38:17 +09002654 return 0;
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002655}
2656
2657/**
2658 * ata_drive_probe_reset - Perform probe reset with given methods
2659 * @ap: port to reset
Tejun Heo7944ea92006-02-02 18:20:00 +09002660 * @probeinit: probeinit method (can be NULL)
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002661 * @softreset: softreset method (can be NULL)
2662 * @hardreset: hardreset method (can be NULL)
2663 * @postreset: postreset method (can be NULL)
2664 * @classes: resulting classes of attached devices
2665 *
2666 * Reset the specified port and classify attached devices using
2667 * given methods. This function prefers softreset but tries all
2668 * possible reset sequences to reset and classify devices. This
2669 * function is intended to be used for constructing ->probe_reset
2670 * callback by low level drivers.
2671 *
2672 * Reset methods should follow the following rules.
2673 *
2674 * - Return 0 on sucess, -errno on failure.
2675 * - If classification is supported, fill classes[] with
2676 * recognized class codes.
2677 * - If classification is not supported, leave classes[] alone.
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002678 *
2679 * LOCKING:
2680 * Kernel thread context (may sleep)
2681 *
2682 * RETURNS:
2683 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2684 * if classification fails, and any error code from reset
2685 * methods.
2686 */
Tejun Heo7944ea92006-02-02 18:20:00 +09002687int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002688 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2689 ata_postreset_fn_t postreset, unsigned int *classes)
2690{
2691 int rc = -EINVAL;
2692
Tejun Heoe3180492006-05-15 20:58:09 +09002693 ata_eh_freeze_port(ap);
2694
Tejun Heo7944ea92006-02-02 18:20:00 +09002695 if (probeinit)
2696 probeinit(ap);
2697
Tejun Heo3c567b72006-05-15 20:57:23 +09002698 if (softreset && !sata_set_spd_needed(ap)) {
Tejun Heo96bd39e2006-05-15 20:57:38 +09002699 rc = ata_do_reset(ap, softreset, classes);
Tejun Heo9974e7c2006-04-01 01:38:17 +09002700 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2701 goto done;
Tejun Heof15a1da2006-05-15 20:57:56 +09002702 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2703 "will try hardreset in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002704 ssleep(5);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002705 }
2706
2707 if (!hardreset)
Tejun Heo9974e7c2006-04-01 01:38:17 +09002708 goto done;
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002709
Tejun Heo90dac022006-04-02 17:54:46 +09002710 while (1) {
Tejun Heo96bd39e2006-05-15 20:57:38 +09002711 rc = ata_do_reset(ap, hardreset, classes);
Tejun Heo90dac022006-04-02 17:54:46 +09002712 if (rc == 0) {
2713 if (classes[0] != ATA_DEV_UNKNOWN)
2714 goto done;
2715 break;
2716 }
2717
Tejun Heo3c567b72006-05-15 20:57:23 +09002718 if (sata_down_spd_limit(ap))
Tejun Heo90dac022006-04-02 17:54:46 +09002719 goto done;
Tejun Heoedbabd82006-04-02 20:55:02 +09002720
Tejun Heof15a1da2006-05-15 20:57:56 +09002721 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2722 "will retry in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002723 ssleep(5);
Tejun Heo90dac022006-04-02 17:54:46 +09002724 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002725
Tejun Heoedbabd82006-04-02 20:55:02 +09002726 if (softreset) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002727 ata_port_printk(ap, KERN_INFO,
2728 "hardreset succeeded without classification, "
2729 "will retry softreset in 5 secs\n");
Tejun Heoedbabd82006-04-02 20:55:02 +09002730 ssleep(5);
2731
Tejun Heo96bd39e2006-05-15 20:57:38 +09002732 rc = ata_do_reset(ap, softreset, classes);
Tejun Heoedbabd82006-04-02 20:55:02 +09002733 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002734
Tejun Heo9974e7c2006-04-01 01:38:17 +09002735 done:
Tejun Heo96bd39e2006-05-15 20:57:38 +09002736 if (rc == 0) {
2737 if (postreset)
2738 postreset(ap, classes);
Tejun Heoe3180492006-05-15 20:58:09 +09002739
2740 ata_eh_thaw_port(ap);
2741
Tejun Heo96bd39e2006-05-15 20:57:38 +09002742 if (classes[0] == ATA_DEV_UNKNOWN)
2743 rc = -ENODEV;
2744 }
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002745 return rc;
2746}
2747
Tejun Heo623a3122006-03-05 17:55:58 +09002748/**
2749 * ata_dev_same_device - Determine whether new ID matches configured device
Tejun Heo623a3122006-03-05 17:55:58 +09002750 * @dev: device to compare against
2751 * @new_class: class of the new device
2752 * @new_id: IDENTIFY page of the new device
2753 *
2754 * Compare @new_class and @new_id against @dev and determine
2755 * whether @dev is the device indicated by @new_class and
2756 * @new_id.
2757 *
2758 * LOCKING:
2759 * None.
2760 *
2761 * RETURNS:
2762 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2763 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002764static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2765 const u16 *new_id)
Tejun Heo623a3122006-03-05 17:55:58 +09002766{
2767 const u16 *old_id = dev->id;
2768 unsigned char model[2][41], serial[2][21];
2769 u64 new_n_sectors;
2770
2771 if (dev->class != new_class) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002772 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2773 dev->class, new_class);
Tejun Heo623a3122006-03-05 17:55:58 +09002774 return 0;
2775 }
2776
2777 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2778 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2779 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2780 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2781 new_n_sectors = ata_id_n_sectors(new_id);
2782
2783 if (strcmp(model[0], model[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002784 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2785 "'%s' != '%s'\n", model[0], model[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09002786 return 0;
2787 }
2788
2789 if (strcmp(serial[0], serial[1])) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002790 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2791 "'%s' != '%s'\n", serial[0], serial[1]);
Tejun Heo623a3122006-03-05 17:55:58 +09002792 return 0;
2793 }
2794
2795 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
Tejun Heof15a1da2006-05-15 20:57:56 +09002796 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2797 "%llu != %llu\n",
2798 (unsigned long long)dev->n_sectors,
2799 (unsigned long long)new_n_sectors);
Tejun Heo623a3122006-03-05 17:55:58 +09002800 return 0;
2801 }
2802
2803 return 1;
2804}
2805
2806/**
2807 * ata_dev_revalidate - Revalidate ATA device
Tejun Heo623a3122006-03-05 17:55:58 +09002808 * @dev: device to revalidate
2809 * @post_reset: is this revalidation after reset?
2810 *
2811 * Re-read IDENTIFY page and make sure @dev is still attached to
2812 * the port.
2813 *
2814 * LOCKING:
2815 * Kernel thread context (may sleep)
2816 *
2817 * RETURNS:
2818 * 0 on success, negative errno otherwise
2819 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002820int ata_dev_revalidate(struct ata_device *dev, int post_reset)
Tejun Heo623a3122006-03-05 17:55:58 +09002821{
Tejun Heo5eb45c02006-04-02 18:51:52 +09002822 unsigned int class = dev->class;
Tejun Heof15a1da2006-05-15 20:57:56 +09002823 u16 *id = (void *)dev->ap->sector_buf;
Tejun Heo623a3122006-03-05 17:55:58 +09002824 int rc;
2825
Tejun Heo5eb45c02006-04-02 18:51:52 +09002826 if (!ata_dev_enabled(dev)) {
2827 rc = -ENODEV;
2828 goto fail;
2829 }
Tejun Heo623a3122006-03-05 17:55:58 +09002830
Tejun Heofe635c72006-05-15 20:57:35 +09002831 /* read ID data */
Tejun Heo3373efd2006-05-15 20:57:53 +09002832 rc = ata_dev_read_id(dev, &class, post_reset, id);
Tejun Heo623a3122006-03-05 17:55:58 +09002833 if (rc)
2834 goto fail;
2835
2836 /* is the device still there? */
Tejun Heo3373efd2006-05-15 20:57:53 +09002837 if (!ata_dev_same_device(dev, class, id)) {
Tejun Heo623a3122006-03-05 17:55:58 +09002838 rc = -ENODEV;
2839 goto fail;
2840 }
2841
Tejun Heofe635c72006-05-15 20:57:35 +09002842 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
Tejun Heo623a3122006-03-05 17:55:58 +09002843
2844 /* configure device according to the new ID */
Tejun Heo3373efd2006-05-15 20:57:53 +09002845 rc = ata_dev_configure(dev, 0);
Tejun Heo5eb45c02006-04-02 18:51:52 +09002846 if (rc == 0)
2847 return 0;
Tejun Heo623a3122006-03-05 17:55:58 +09002848
2849 fail:
Tejun Heof15a1da2006-05-15 20:57:56 +09002850 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
Tejun Heo623a3122006-03-05 17:55:58 +09002851 return rc;
2852}
2853
Arjan van de Ven98ac62d2005-11-28 10:06:23 +01002854static const char * const ata_dma_blacklist [] = {
Alan Coxf4b15fe2006-03-22 15:54:04 +00002855 "WDC AC11000H", NULL,
2856 "WDC AC22100H", NULL,
2857 "WDC AC32500H", NULL,
2858 "WDC AC33100H", NULL,
2859 "WDC AC31600H", NULL,
2860 "WDC AC32100H", "24.09P07",
2861 "WDC AC23200L", "21.10N21",
2862 "Compaq CRD-8241B", NULL,
2863 "CRD-8400B", NULL,
2864 "CRD-8480B", NULL,
2865 "CRD-8482B", NULL,
2866 "CRD-84", NULL,
2867 "SanDisk SDP3B", NULL,
2868 "SanDisk SDP3B-64", NULL,
2869 "SANYO CD-ROM CRD", NULL,
2870 "HITACHI CDR-8", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002871 "HITACHI CDR-8335", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002872 "HITACHI CDR-8435", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002873 "Toshiba CD-ROM XM-6202B", NULL,
2874 "TOSHIBA CD-ROM XM-1702BC", NULL,
2875 "CD-532E-A", NULL,
2876 "E-IDE CD-ROM CR-840", NULL,
2877 "CD-ROM Drive/F5A", NULL,
2878 "WPI CDD-820", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002879 "SAMSUNG CD-ROM SC-148C", NULL,
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002880 "SAMSUNG CD-ROM SC", NULL,
Alan Coxf4b15fe2006-03-22 15:54:04 +00002881 "SanDisk SDP3B-64", NULL,
2882 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2883 "_NEC DV5800A", NULL,
2884 "SAMSUNG CD-ROM SN-124", "N001"
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885};
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05002886
Alan Coxf4b15fe2006-03-22 15:54:04 +00002887static int ata_strim(char *s, size_t len)
2888{
2889 len = strnlen(s, len);
2890
2891 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2892 while ((len > 0) && (s[len - 1] == ' ')) {
2893 len--;
2894 s[len] = 0;
2895 }
2896 return len;
2897}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898
Jeff Garzik057ace52005-10-22 14:27:05 -04002899static int ata_dma_blacklisted(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900{
Alan Coxf4b15fe2006-03-22 15:54:04 +00002901 unsigned char model_num[40];
2902 unsigned char model_rev[16];
2903 unsigned int nlen, rlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904 int i;
2905
Alan Coxf4b15fe2006-03-22 15:54:04 +00002906 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2907 sizeof(model_num));
2908 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2909 sizeof(model_rev));
2910 nlen = ata_strim(model_num, sizeof(model_num));
2911 rlen = ata_strim(model_rev, sizeof(model_rev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912
Alan Coxf4b15fe2006-03-22 15:54:04 +00002913 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2914 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2915 if (ata_dma_blacklist[i+1] == NULL)
2916 return 1;
2917 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2918 return 1;
2919 }
2920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 return 0;
2922}
2923
Tejun Heoa6d5a512006-03-06 04:31:57 +09002924/**
2925 * ata_dev_xfermask - Compute supported xfermask of the given device
Tejun Heoa6d5a512006-03-06 04:31:57 +09002926 * @dev: Device to compute xfermask for
2927 *
Tejun Heoacf356b2006-03-24 14:07:50 +09002928 * Compute supported xfermask of @dev and store it in
2929 * dev->*_mask. This function is responsible for applying all
2930 * known limits including host controller limits, device
2931 * blacklist, etc...
Tejun Heoa6d5a512006-03-06 04:31:57 +09002932 *
Tejun Heo600511e2006-03-25 11:14:07 +09002933 * FIXME: The current implementation limits all transfer modes to
2934 * the fastest of the lowested device on the port. This is not
Tejun Heo05c8e0a2006-03-25 14:28:57 +09002935 * required on most controllers.
Tejun Heo600511e2006-03-25 11:14:07 +09002936 *
Tejun Heoa6d5a512006-03-06 04:31:57 +09002937 * LOCKING:
2938 * None.
Tejun Heoa6d5a512006-03-06 04:31:57 +09002939 */
Tejun Heo3373efd2006-05-15 20:57:53 +09002940static void ata_dev_xfermask(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941{
Tejun Heo3373efd2006-05-15 20:57:53 +09002942 struct ata_port *ap = dev->ap;
Alan Cox5444a6f2006-03-27 18:58:20 +01002943 struct ata_host_set *hs = ap->host_set;
Tejun Heoa6d5a512006-03-06 04:31:57 +09002944 unsigned long xfer_mask;
2945 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946
Tejun Heo565083e2006-04-02 17:54:47 +09002947 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2948 ap->mwdma_mask, ap->udma_mask);
2949
2950 /* Apply cable rule here. Don't apply it early because when
2951 * we handle hot plug the cable type can itself change.
2952 */
2953 if (ap->cbl == ATA_CBL_PATA40)
2954 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
Alan Cox5444a6f2006-03-27 18:58:20 +01002956 /* FIXME: Use port-wide xfermask for now */
Tejun Heoa6d5a512006-03-06 04:31:57 +09002957 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2958 struct ata_device *d = &ap->device[i];
Tejun Heo565083e2006-04-02 17:54:47 +09002959
2960 if (ata_dev_absent(d))
Tejun Heoa6d5a512006-03-06 04:31:57 +09002961 continue;
Tejun Heo565083e2006-04-02 17:54:47 +09002962
2963 if (ata_dev_disabled(d)) {
2964 /* to avoid violating device selection timing */
2965 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2966 UINT_MAX, UINT_MAX);
2967 continue;
2968 }
2969
2970 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2971 d->mwdma_mask, d->udma_mask);
Tejun Heoa6d5a512006-03-06 04:31:57 +09002972 xfer_mask &= ata_id_xfermask(d->id);
2973 if (ata_dma_blacklisted(d))
2974 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975 }
2976
Tejun Heoa6d5a512006-03-06 04:31:57 +09002977 if (ata_dma_blacklisted(dev))
Tejun Heof15a1da2006-05-15 20:57:56 +09002978 ata_dev_printk(dev, KERN_WARNING,
2979 "device is on DMA blacklist, disabling DMA\n");
Tejun Heoa6d5a512006-03-06 04:31:57 +09002980
Alan Cox5444a6f2006-03-27 18:58:20 +01002981 if (hs->flags & ATA_HOST_SIMPLEX) {
2982 if (hs->simplex_claimed)
2983 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2984 }
Tejun Heo565083e2006-04-02 17:54:47 +09002985
Alan Cox5444a6f2006-03-27 18:58:20 +01002986 if (ap->ops->mode_filter)
2987 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2988
Tejun Heo565083e2006-04-02 17:54:47 +09002989 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2990 &dev->mwdma_mask, &dev->udma_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991}
2992
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995 * @dev: Device to which command will be sent
2996 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002997 * Issue SET FEATURES - XFER MODE command to device @dev
2998 * on port @ap.
2999 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003000 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003001 * PCI/etc. bus probe sem.
Tejun Heo83206a22006-03-24 15:25:31 +09003002 *
3003 * RETURNS:
3004 * 0 on success, AC_ERR_* mask otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 */
3006
Tejun Heo3373efd2006-05-15 20:57:53 +09003007static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003008{
Tejun Heoa0123702005-12-13 14:49:31 +09003009 struct ata_taskfile tf;
Tejun Heo83206a22006-03-24 15:25:31 +09003010 unsigned int err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003011
3012 /* set up set-features taskfile */
3013 DPRINTK("set features - xfer mode\n");
3014
Tejun Heo3373efd2006-05-15 20:57:53 +09003015 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003016 tf.command = ATA_CMD_SET_FEATURES;
3017 tf.feature = SETFEATURES_XFER;
3018 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3019 tf.protocol = ATA_PROT_NODATA;
3020 tf.nsect = dev->xfer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021
Tejun Heo3373efd2006-05-15 20:57:53 +09003022 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023
Tejun Heo83206a22006-03-24 15:25:31 +09003024 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3025 return err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026}
3027
3028/**
Albert Lee8bf62ece2005-05-12 15:29:42 -04003029 * ata_dev_init_params - Issue INIT DEV PARAMS command
Albert Lee8bf62ece2005-05-12 15:29:42 -04003030 * @dev: Device to which command will be sent
Tejun Heo3373efd2006-05-15 20:57:53 +09003031 * @heads: Number of heads
3032 * @sectors: Number of sectors
Albert Lee8bf62ece2005-05-12 15:29:42 -04003033 *
3034 * LOCKING:
Tejun Heo6aff8f12006-02-15 18:24:09 +09003035 * Kernel thread context (may sleep)
3036 *
3037 * RETURNS:
3038 * 0 on success, AC_ERR_* mask otherwise.
Albert Lee8bf62ece2005-05-12 15:29:42 -04003039 */
Tejun Heo3373efd2006-05-15 20:57:53 +09003040static unsigned int ata_dev_init_params(struct ata_device *dev,
3041 u16 heads, u16 sectors)
Albert Lee8bf62ece2005-05-12 15:29:42 -04003042{
Tejun Heoa0123702005-12-13 14:49:31 +09003043 struct ata_taskfile tf;
Tejun Heo6aff8f12006-02-15 18:24:09 +09003044 unsigned int err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003045
3046 /* Number of sectors per track 1-255. Number of heads 1-16 */
3047 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
Albert Lee00b6f5e2006-03-27 16:39:18 +08003048 return AC_ERR_INVALID;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003049
3050 /* set up init dev params taskfile */
3051 DPRINTK("init dev params \n");
3052
Tejun Heo3373efd2006-05-15 20:57:53 +09003053 ata_tf_init(dev, &tf);
Tejun Heoa0123702005-12-13 14:49:31 +09003054 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3055 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3056 tf.protocol = ATA_PROT_NODATA;
3057 tf.nsect = sectors;
3058 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
Albert Lee8bf62ece2005-05-12 15:29:42 -04003059
Tejun Heo3373efd2006-05-15 20:57:53 +09003060 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Albert Lee8bf62ece2005-05-12 15:29:42 -04003061
Tejun Heo6aff8f12006-02-15 18:24:09 +09003062 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3063 return err_mask;
Albert Lee8bf62ece2005-05-12 15:29:42 -04003064}
3065
3066/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003067 * ata_sg_clean - Unmap DMA memory associated with command
3068 * @qc: Command containing DMA memory to be released
3069 *
3070 * Unmap all mapped DMA memory associated with this command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 *
3072 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003073 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003074 */
3075
3076static void ata_sg_clean(struct ata_queued_cmd *qc)
3077{
3078 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003079 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003081 void *pad_buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082
Tejun Heoa46314742006-02-11 19:11:13 +09003083 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3084 WARN_ON(sg == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085
3086 if (qc->flags & ATA_QCFLAG_SINGLE)
Jeff Garzikf1318832006-02-20 16:55:56 -05003087 WARN_ON(qc->n_elem > 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05003089 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003091 /* if we padded the buffer out to 32-bit bound, and data
3092 * xfer direction is from-device, we must copy from the
3093 * pad buffer back into the supplied buffer
3094 */
3095 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3096 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3097
3098 if (qc->flags & ATA_QCFLAG_SG) {
Jeff Garzike1410f22005-11-14 14:06:26 -05003099 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003100 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003101 /* restore last sg */
3102 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3103 if (pad_buf) {
3104 struct scatterlist *psg = &qc->pad_sgent;
3105 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3106 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003107 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003108 }
3109 } else {
Tejun Heo2e242fa2006-02-20 23:48:38 +09003110 if (qc->n_elem)
Brian King2f1f6102006-03-23 17:30:15 -06003111 dma_unmap_single(ap->dev,
Jeff Garzike1410f22005-11-14 14:06:26 -05003112 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3113 dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003114 /* restore sg */
3115 sg->length += qc->pad_len;
3116 if (pad_buf)
3117 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3118 pad_buf, qc->pad_len);
3119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003120
3121 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003122 qc->__sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123}
3124
3125/**
3126 * ata_fill_sg - Fill PCI IDE PRD table
3127 * @qc: Metadata associated with taskfile to be transferred
3128 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003129 * Fill PCI IDE PRD (scatter-gather) table with segments
3130 * associated with the current disk command.
3131 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003132 * LOCKING:
Jeff Garzik780a87f2005-05-30 15:41:05 -04003133 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003134 *
3135 */
3136static void ata_fill_sg(struct ata_queued_cmd *qc)
3137{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003138 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003139 struct scatterlist *sg;
3140 unsigned int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141
Tejun Heoa46314742006-02-11 19:11:13 +09003142 WARN_ON(qc->__sg == NULL);
Jeff Garzikf1318832006-02-20 16:55:56 -05003143 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003144
3145 idx = 0;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003146 ata_for_each_sg(sg, qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003147 u32 addr, offset;
3148 u32 sg_len, len;
3149
3150 /* determine if physical DMA addr spans 64K boundary.
3151 * Note h/w doesn't support 64-bit, so we unconditionally
3152 * truncate dma_addr_t to u32.
3153 */
3154 addr = (u32) sg_dma_address(sg);
3155 sg_len = sg_dma_len(sg);
3156
3157 while (sg_len) {
3158 offset = addr & 0xffff;
3159 len = sg_len;
3160 if ((offset + sg_len) > 0x10000)
3161 len = 0x10000 - offset;
3162
3163 ap->prd[idx].addr = cpu_to_le32(addr);
3164 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3165 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3166
3167 idx++;
3168 sg_len -= len;
3169 addr += len;
3170 }
3171 }
3172
3173 if (idx)
3174 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3175}
3176/**
3177 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3178 * @qc: Metadata associated with taskfile to check
3179 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003180 * Allow low-level driver to filter ATA PACKET commands, returning
3181 * a status indicating whether or not it is OK to use DMA for the
3182 * supplied PACKET command.
3183 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003185 * spin_lock_irqsave(host_set lock)
3186 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003187 * RETURNS: 0 when ATAPI DMA can be used
3188 * nonzero otherwise
3189 */
3190int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3191{
3192 struct ata_port *ap = qc->ap;
3193 int rc = 0; /* Assume ATAPI DMA is OK by default */
3194
3195 if (ap->ops->check_atapi_dma)
3196 rc = ap->ops->check_atapi_dma(qc);
3197
3198 return rc;
3199}
3200/**
3201 * ata_qc_prep - Prepare taskfile for submission
3202 * @qc: Metadata associated with taskfile to be prepared
3203 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04003204 * Prepare ATA taskfile for submission.
3205 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003206 * LOCKING:
3207 * spin_lock_irqsave(host_set lock)
3208 */
3209void ata_qc_prep(struct ata_queued_cmd *qc)
3210{
3211 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3212 return;
3213
3214 ata_fill_sg(qc);
3215}
3216
Brian Kinge46834c2006-03-17 17:04:03 -06003217void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3218
Jeff Garzik0cba6322005-05-30 19:49:12 -04003219/**
3220 * ata_sg_init_one - Associate command with memory buffer
3221 * @qc: Command to be associated
3222 * @buf: Memory buffer
3223 * @buflen: Length of memory buffer, in bytes.
3224 *
3225 * Initialize the data-related elements of queued_cmd @qc
3226 * to point to a single memory buffer, @buf of byte length @buflen.
3227 *
3228 * LOCKING:
3229 * spin_lock_irqsave(host_set lock)
3230 */
3231
Linus Torvalds1da177e2005-04-16 15:20:36 -07003232void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3233{
3234 struct scatterlist *sg;
3235
3236 qc->flags |= ATA_QCFLAG_SINGLE;
3237
3238 memset(&qc->sgent, 0, sizeof(qc->sgent));
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003239 qc->__sg = &qc->sgent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240 qc->n_elem = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003241 qc->orig_n_elem = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242 qc->buf_virt = buf;
3243
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003244 sg = qc->__sg;
Jeff Garzikf0612bb2005-10-30 01:58:18 -05003245 sg_init_one(sg, buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003246}
3247
Jeff Garzik0cba6322005-05-30 19:49:12 -04003248/**
3249 * ata_sg_init - Associate command with scatter-gather table.
3250 * @qc: Command to be associated
3251 * @sg: Scatter-gather table.
3252 * @n_elem: Number of elements in s/g table.
3253 *
3254 * Initialize the data-related elements of queued_cmd @qc
3255 * to point to a scatter-gather table @sg, containing @n_elem
3256 * elements.
3257 *
3258 * LOCKING:
3259 * spin_lock_irqsave(host_set lock)
3260 */
3261
Linus Torvalds1da177e2005-04-16 15:20:36 -07003262void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3263 unsigned int n_elem)
3264{
3265 qc->flags |= ATA_QCFLAG_SG;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003266 qc->__sg = sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003267 qc->n_elem = n_elem;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003268 qc->orig_n_elem = n_elem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269}
3270
3271/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003272 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3273 * @qc: Command with memory buffer to be mapped.
3274 *
3275 * DMA-map the memory buffer associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003276 *
3277 * LOCKING:
3278 * spin_lock_irqsave(host_set lock)
3279 *
3280 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003281 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003282 */
3283
3284static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3285{
3286 struct ata_port *ap = qc->ap;
3287 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003288 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003289 dma_addr_t dma_address;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003290 int trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003291
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003292 /* we must lengthen transfers to end on a 32-bit boundary */
3293 qc->pad_len = sg->length & 3;
3294 if (qc->pad_len) {
3295 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3296 struct scatterlist *psg = &qc->pad_sgent;
3297
Tejun Heoa46314742006-02-11 19:11:13 +09003298 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003299
3300 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3301
3302 if (qc->tf.flags & ATA_TFLAG_WRITE)
3303 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3304 qc->pad_len);
3305
3306 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3307 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3308 /* trim sg */
3309 sg->length -= qc->pad_len;
Tejun Heo2e242fa2006-02-20 23:48:38 +09003310 if (sg->length == 0)
3311 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003312
3313 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3314 sg->length, qc->pad_len);
3315 }
3316
Tejun Heo2e242fa2006-02-20 23:48:38 +09003317 if (trim_sg) {
3318 qc->n_elem--;
Jeff Garzike1410f22005-11-14 14:06:26 -05003319 goto skip_map;
3320 }
3321
Brian King2f1f6102006-03-23 17:30:15 -06003322 dma_address = dma_map_single(ap->dev, qc->buf_virt,
Albert Lee32529e02005-05-26 03:49:42 -04003323 sg->length, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003324 if (dma_mapping_error(dma_address)) {
3325 /* restore sg */
3326 sg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003327 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003328 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003329
3330 sg_dma_address(sg) = dma_address;
Albert Lee32529e02005-05-26 03:49:42 -04003331 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003332
Tejun Heo2e242fa2006-02-20 23:48:38 +09003333skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3335 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3336
3337 return 0;
3338}
3339
3340/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04003341 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3342 * @qc: Command with scatter-gather table to be mapped.
3343 *
3344 * DMA-map the scatter-gather table associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003345 *
3346 * LOCKING:
3347 * spin_lock_irqsave(host_set lock)
3348 *
3349 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003350 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003351 *
3352 */
3353
3354static int ata_sg_setup(struct ata_queued_cmd *qc)
3355{
3356 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003357 struct scatterlist *sg = qc->__sg;
3358 struct scatterlist *lsg = &sg[qc->n_elem - 1];
Jeff Garzike1410f22005-11-14 14:06:26 -05003359 int n_elem, pre_n_elem, dir, trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360
3361 VPRINTK("ENTER, ata%u\n", ap->id);
Tejun Heoa46314742006-02-11 19:11:13 +09003362 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003363
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003364 /* we must lengthen transfers to end on a 32-bit boundary */
3365 qc->pad_len = lsg->length & 3;
3366 if (qc->pad_len) {
3367 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3368 struct scatterlist *psg = &qc->pad_sgent;
3369 unsigned int offset;
3370
Tejun Heoa46314742006-02-11 19:11:13 +09003371 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003372
3373 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3374
3375 /*
3376 * psg->page/offset are used to copy to-be-written
3377 * data in this function or read data in ata_sg_clean.
3378 */
3379 offset = lsg->offset + lsg->length - qc->pad_len;
3380 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3381 psg->offset = offset_in_page(offset);
3382
3383 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3384 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3385 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05003386 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003387 }
3388
3389 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3390 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3391 /* trim last sg */
3392 lsg->length -= qc->pad_len;
Jeff Garzike1410f22005-11-14 14:06:26 -05003393 if (lsg->length == 0)
3394 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003395
3396 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3397 qc->n_elem - 1, lsg->length, qc->pad_len);
3398 }
3399
Jeff Garzike1410f22005-11-14 14:06:26 -05003400 pre_n_elem = qc->n_elem;
3401 if (trim_sg && pre_n_elem)
3402 pre_n_elem--;
3403
3404 if (!pre_n_elem) {
3405 n_elem = 0;
3406 goto skip_map;
3407 }
3408
Linus Torvalds1da177e2005-04-16 15:20:36 -07003409 dir = qc->dma_dir;
Brian King2f1f6102006-03-23 17:30:15 -06003410 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05003411 if (n_elem < 1) {
3412 /* restore last sg */
3413 lsg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003414 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05003415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003416
3417 DPRINTK("%d sg elements mapped\n", n_elem);
3418
Jeff Garzike1410f22005-11-14 14:06:26 -05003419skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420 qc->n_elem = n_elem;
3421
3422 return 0;
3423}
3424
3425/**
Tejun Heo40e8c822005-08-22 17:12:45 +09003426 * ata_poll_qc_complete - turn irq back on and finish qc
3427 * @qc: Command to complete
Randy Dunlap8e8b77d2005-11-01 21:29:27 -08003428 * @err_mask: ATA status register content
Tejun Heo40e8c822005-08-22 17:12:45 +09003429 *
3430 * LOCKING:
3431 * None. (grabs host lock)
3432 */
3433
Albert Leea22e2eb2005-12-05 15:38:02 +08003434void ata_poll_qc_complete(struct ata_queued_cmd *qc)
Tejun Heo40e8c822005-08-22 17:12:45 +09003435{
3436 struct ata_port *ap = qc->ap;
Jeff Garzikb8f61532005-08-25 22:01:20 -04003437 unsigned long flags;
Tejun Heo40e8c822005-08-22 17:12:45 +09003438
Jeff Garzikb8f61532005-08-25 22:01:20 -04003439 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo40e8c822005-08-22 17:12:45 +09003440 ap->flags &= ~ATA_FLAG_NOINTR;
3441 ata_irq_on(ap);
Albert Leea22e2eb2005-12-05 15:38:02 +08003442 ata_qc_complete(qc);
Jeff Garzikb8f61532005-08-25 22:01:20 -04003443 spin_unlock_irqrestore(&ap->host_set->lock, flags);
Tejun Heo40e8c822005-08-22 17:12:45 +09003444}
3445
3446/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003447 * ata_pio_poll - poll using PIO, depending on current state
Tejun Heoc91af2c2006-04-02 18:51:53 +09003448 * @qc: qc in progress
Linus Torvalds1da177e2005-04-16 15:20:36 -07003449 *
3450 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003451 * None. (executing in kernel thread context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003452 *
3453 * RETURNS:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003454 * timeout value to use
Linus Torvalds1da177e2005-04-16 15:20:36 -07003455 */
Tejun Heoc91af2c2006-04-02 18:51:53 +09003456static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003458 struct ata_port *ap = qc->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003459 u8 status;
Albert Lee14be71f2005-09-27 17:36:35 +08003460 unsigned int poll_state = HSM_ST_UNKNOWN;
3461 unsigned int reg_state = HSM_ST_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003462
Albert Lee14be71f2005-09-27 17:36:35 +08003463 switch (ap->hsm_task_state) {
3464 case HSM_ST:
3465 case HSM_ST_POLL:
3466 poll_state = HSM_ST_POLL;
3467 reg_state = HSM_ST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003468 break;
Albert Lee14be71f2005-09-27 17:36:35 +08003469 case HSM_ST_LAST:
3470 case HSM_ST_LAST_POLL:
3471 poll_state = HSM_ST_LAST_POLL;
3472 reg_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473 break;
3474 default:
3475 BUG();
3476 break;
3477 }
3478
3479 status = ata_chk_status(ap);
3480 if (status & ATA_BUSY) {
3481 if (time_after(jiffies, ap->pio_task_timeout)) {
Tejun Heo11a56d22006-01-23 13:09:36 +09003482 qc->err_mask |= AC_ERR_TIMEOUT;
Albert Lee7c398332005-11-09 13:03:30 +08003483 ap->hsm_task_state = HSM_ST_TMOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003484 return 0;
3485 }
Albert Lee14be71f2005-09-27 17:36:35 +08003486 ap->hsm_task_state = poll_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003487 return ATA_SHORT_PAUSE;
3488 }
3489
Albert Lee14be71f2005-09-27 17:36:35 +08003490 ap->hsm_task_state = reg_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003491 return 0;
3492}
3493
3494/**
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003495 * ata_pio_complete - check if drive is busy or idle
Tejun Heoc91af2c2006-04-02 18:51:53 +09003496 * @qc: qc to complete
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497 *
3498 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003499 * None. (executing in kernel thread context)
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003500 *
3501 * RETURNS:
3502 * Non-zero if qc completed, zero otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 */
Tejun Heoc91af2c2006-04-02 18:51:53 +09003504static int ata_pio_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003505{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003506 struct ata_port *ap = qc->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003507 u8 drv_stat;
3508
3509 /*
Alan Cox31433ea2005-08-26 15:56:47 +01003510 * This is purely heuristic. This is a fast path. Sometimes when
3511 * we enter, BSY will be cleared in a chk-status or two. If not,
3512 * the drive is probably seeking or something. Snooze for a couple
3513 * msecs, then chk-status again. If still busy, fall back to
Albert Lee14be71f2005-09-27 17:36:35 +08003514 * HSM_ST_POLL state.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003515 */
Albert Leefe79e682005-12-06 11:34:59 +08003516 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3517 if (drv_stat & ATA_BUSY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003518 msleep(2);
Albert Leefe79e682005-12-06 11:34:59 +08003519 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3520 if (drv_stat & ATA_BUSY) {
Albert Lee14be71f2005-09-27 17:36:35 +08003521 ap->hsm_task_state = HSM_ST_LAST_POLL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003522 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003523 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003524 }
3525 }
3526
3527 drv_stat = ata_wait_idle(ap);
3528 if (!ata_ok(drv_stat)) {
Albert Lee1c848982005-12-05 15:40:15 +08003529 qc->err_mask |= __ac_err_mask(drv_stat);
Albert Lee14be71f2005-09-27 17:36:35 +08003530 ap->hsm_task_state = HSM_ST_ERR;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003531 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 }
3533
Albert Lee14be71f2005-09-27 17:36:35 +08003534 ap->hsm_task_state = HSM_ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003535
Tejun Heoa46314742006-02-11 19:11:13 +09003536 WARN_ON(qc->err_mask);
Albert Leea22e2eb2005-12-05 15:38:02 +08003537 ata_poll_qc_complete(qc);
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003538
3539 /* another command may start at this point */
3540
3541 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003542}
3543
Edward Falk0baab862005-06-02 18:17:13 -04003544
3545/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003546 * swap_buf_le16 - swap halves of 16-bit words in place
Edward Falk0baab862005-06-02 18:17:13 -04003547 * @buf: Buffer to swap
3548 * @buf_words: Number of 16-bit words in buffer.
3549 *
3550 * Swap halves of 16-bit words if needed to convert from
3551 * little-endian byte order to native cpu byte order, or
3552 * vice-versa.
3553 *
3554 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003555 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04003556 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003557void swap_buf_le16(u16 *buf, unsigned int buf_words)
3558{
3559#ifdef __BIG_ENDIAN
3560 unsigned int i;
3561
3562 for (i = 0; i < buf_words; i++)
3563 buf[i] = le16_to_cpu(buf[i]);
3564#endif /* __BIG_ENDIAN */
3565}
3566
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003567/**
3568 * ata_mmio_data_xfer - Transfer data by MMIO
3569 * @ap: port to read/write
3570 * @buf: data buffer
3571 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003572 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003573 *
3574 * Transfer data from/to the device data register by MMIO.
3575 *
3576 * LOCKING:
3577 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003578 */
3579
Linus Torvalds1da177e2005-04-16 15:20:36 -07003580static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3581 unsigned int buflen, int write_data)
3582{
3583 unsigned int i;
3584 unsigned int words = buflen >> 1;
3585 u16 *buf16 = (u16 *) buf;
3586 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3587
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003588 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589 if (write_data) {
3590 for (i = 0; i < words; i++)
3591 writew(le16_to_cpu(buf16[i]), mmio);
3592 } else {
3593 for (i = 0; i < words; i++)
3594 buf16[i] = cpu_to_le16(readw(mmio));
3595 }
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003596
3597 /* Transfer trailing 1 byte, if any. */
3598 if (unlikely(buflen & 0x01)) {
3599 u16 align_buf[1] = { 0 };
3600 unsigned char *trailing_buf = buf + buflen - 1;
3601
3602 if (write_data) {
3603 memcpy(align_buf, trailing_buf, 1);
3604 writew(le16_to_cpu(align_buf[0]), mmio);
3605 } else {
3606 align_buf[0] = cpu_to_le16(readw(mmio));
3607 memcpy(trailing_buf, align_buf, 1);
3608 }
3609 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003610}
3611
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003612/**
3613 * ata_pio_data_xfer - Transfer data by PIO
3614 * @ap: port to read/write
3615 * @buf: data buffer
3616 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003617 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003618 *
3619 * Transfer data from/to the device data register by PIO.
3620 *
3621 * LOCKING:
3622 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003623 */
3624
Linus Torvalds1da177e2005-04-16 15:20:36 -07003625static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3626 unsigned int buflen, int write_data)
3627{
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003628 unsigned int words = buflen >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003629
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003630 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003631 if (write_data)
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003632 outsw(ap->ioaddr.data_addr, buf, words);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003633 else
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003634 insw(ap->ioaddr.data_addr, buf, words);
3635
3636 /* Transfer trailing 1 byte, if any. */
3637 if (unlikely(buflen & 0x01)) {
3638 u16 align_buf[1] = { 0 };
3639 unsigned char *trailing_buf = buf + buflen - 1;
3640
3641 if (write_data) {
3642 memcpy(align_buf, trailing_buf, 1);
3643 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3644 } else {
3645 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3646 memcpy(trailing_buf, align_buf, 1);
3647 }
3648 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003649}
3650
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003651/**
3652 * ata_data_xfer - Transfer data from/to the data register.
3653 * @ap: port to read/write
3654 * @buf: data buffer
3655 * @buflen: buffer length
3656 * @do_write: read/write
3657 *
3658 * Transfer data from/to the device data register.
3659 *
3660 * LOCKING:
3661 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003662 */
3663
Linus Torvalds1da177e2005-04-16 15:20:36 -07003664static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3665 unsigned int buflen, int do_write)
3666{
Alan Coxa1bd9e62006-01-17 20:53:50 +00003667 /* Make the crap hardware pay the costs not the good stuff */
3668 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3669 unsigned long flags;
3670 local_irq_save(flags);
3671 if (ap->flags & ATA_FLAG_MMIO)
3672 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3673 else
3674 ata_pio_data_xfer(ap, buf, buflen, do_write);
3675 local_irq_restore(flags);
3676 } else {
3677 if (ap->flags & ATA_FLAG_MMIO)
3678 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3679 else
3680 ata_pio_data_xfer(ap, buf, buflen, do_write);
3681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003682}
3683
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003684/**
3685 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3686 * @qc: Command on going
3687 *
3688 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3689 *
3690 * LOCKING:
3691 * Inherited from caller.
3692 */
3693
Linus Torvalds1da177e2005-04-16 15:20:36 -07003694static void ata_pio_sector(struct ata_queued_cmd *qc)
3695{
3696 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003697 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003698 struct ata_port *ap = qc->ap;
3699 struct page *page;
3700 unsigned int offset;
3701 unsigned char *buf;
3702
3703 if (qc->cursect == (qc->nsect - 1))
Albert Lee14be71f2005-09-27 17:36:35 +08003704 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003705
3706 page = sg[qc->cursg].page;
3707 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3708
3709 /* get the current page and offset */
3710 page = nth_page(page, (offset >> PAGE_SHIFT));
3711 offset %= PAGE_SIZE;
3712
3713 buf = kmap(page) + offset;
3714
3715 qc->cursect++;
3716 qc->cursg_ofs++;
3717
Albert Lee32529e02005-05-26 03:49:42 -04003718 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003719 qc->cursg++;
3720 qc->cursg_ofs = 0;
3721 }
3722
3723 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3724
3725 /* do the actual data transfer */
3726 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3727 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3728
3729 kunmap(page);
3730}
3731
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003732/**
3733 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3734 * @qc: Command on going
3735 * @bytes: number of bytes
3736 *
3737 * Transfer Transfer data from/to the ATAPI device.
3738 *
3739 * LOCKING:
3740 * Inherited from caller.
3741 *
3742 */
3743
Linus Torvalds1da177e2005-04-16 15:20:36 -07003744static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3745{
3746 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003747 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003748 struct ata_port *ap = qc->ap;
3749 struct page *page;
3750 unsigned char *buf;
3751 unsigned int offset, count;
3752
Albert Lee563a6e12005-08-12 14:17:50 +08003753 if (qc->curbytes + bytes >= qc->nbytes)
Albert Lee14be71f2005-09-27 17:36:35 +08003754 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003755
3756next_sg:
Albert Lee563a6e12005-08-12 14:17:50 +08003757 if (unlikely(qc->cursg >= qc->n_elem)) {
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003758 /*
Albert Lee563a6e12005-08-12 14:17:50 +08003759 * The end of qc->sg is reached and the device expects
3760 * more data to transfer. In order not to overrun qc->sg
3761 * and fulfill length specified in the byte count register,
3762 * - for read case, discard trailing data from the device
3763 * - for write case, padding zero data to the device
3764 */
3765 u16 pad_buf[1] = { 0 };
3766 unsigned int words = bytes >> 1;
3767 unsigned int i;
3768
3769 if (words) /* warning if bytes > 1 */
Tejun Heof15a1da2006-05-15 20:57:56 +09003770 ata_dev_printk(qc->dev, KERN_WARNING,
3771 "%u bytes trailing data\n", bytes);
Albert Lee563a6e12005-08-12 14:17:50 +08003772
3773 for (i = 0; i < words; i++)
3774 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3775
Albert Lee14be71f2005-09-27 17:36:35 +08003776 ap->hsm_task_state = HSM_ST_LAST;
Albert Lee563a6e12005-08-12 14:17:50 +08003777 return;
3778 }
3779
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003780 sg = &qc->__sg[qc->cursg];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003781
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782 page = sg->page;
3783 offset = sg->offset + qc->cursg_ofs;
3784
3785 /* get the current page and offset */
3786 page = nth_page(page, (offset >> PAGE_SHIFT));
3787 offset %= PAGE_SIZE;
3788
Albert Lee6952df02005-06-06 15:56:03 +08003789 /* don't overrun current sg */
Albert Lee32529e02005-05-26 03:49:42 -04003790 count = min(sg->length - qc->cursg_ofs, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003791
3792 /* don't cross page boundaries */
3793 count = min(count, (unsigned int)PAGE_SIZE - offset);
3794
3795 buf = kmap(page) + offset;
3796
3797 bytes -= count;
3798 qc->curbytes += count;
3799 qc->cursg_ofs += count;
3800
Albert Lee32529e02005-05-26 03:49:42 -04003801 if (qc->cursg_ofs == sg->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003802 qc->cursg++;
3803 qc->cursg_ofs = 0;
3804 }
3805
3806 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3807
3808 /* do the actual data transfer */
3809 ata_data_xfer(ap, buf, count, do_write);
3810
3811 kunmap(page);
3812
Albert Lee563a6e12005-08-12 14:17:50 +08003813 if (bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003814 goto next_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003815}
3816
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003817/**
3818 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3819 * @qc: Command on going
3820 *
3821 * Transfer Transfer data from/to the ATAPI device.
3822 *
3823 * LOCKING:
3824 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003825 */
3826
Linus Torvalds1da177e2005-04-16 15:20:36 -07003827static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3828{
3829 struct ata_port *ap = qc->ap;
3830 struct ata_device *dev = qc->dev;
3831 unsigned int ireason, bc_lo, bc_hi, bytes;
3832 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3833
3834 ap->ops->tf_read(ap, &qc->tf);
3835 ireason = qc->tf.nsect;
3836 bc_lo = qc->tf.lbam;
3837 bc_hi = qc->tf.lbah;
3838 bytes = (bc_hi << 8) | bc_lo;
3839
3840 /* shall be cleared to zero, indicating xfer of data */
3841 if (ireason & (1 << 0))
3842 goto err_out;
3843
3844 /* make sure transfer direction matches expected */
3845 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3846 if (do_write != i_write)
3847 goto err_out;
3848
3849 __atapi_pio_bytes(qc, bytes);
3850
3851 return;
3852
3853err_out:
Tejun Heof15a1da2006-05-15 20:57:56 +09003854 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
Tejun Heo11a56d22006-01-23 13:09:36 +09003855 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08003856 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003857}
3858
3859/**
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003860 * ata_pio_block - start PIO on a block
Tejun Heoc91af2c2006-04-02 18:51:53 +09003861 * @qc: qc to transfer block for
Linus Torvalds1da177e2005-04-16 15:20:36 -07003862 *
3863 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003864 * None. (executing in kernel thread context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003865 */
Tejun Heoc91af2c2006-04-02 18:51:53 +09003866static void ata_pio_block(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003868 struct ata_port *ap = qc->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003869 u8 status;
3870
3871 /*
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003872 * This is purely heuristic. This is a fast path.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003873 * Sometimes when we enter, BSY will be cleared in
3874 * a chk-status or two. If not, the drive is probably seeking
3875 * or something. Snooze for a couple msecs, then
3876 * chk-status again. If still busy, fall back to
Albert Lee14be71f2005-09-27 17:36:35 +08003877 * HSM_ST_POLL state.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003878 */
3879 status = ata_busy_wait(ap, ATA_BUSY, 5);
3880 if (status & ATA_BUSY) {
3881 msleep(2);
3882 status = ata_busy_wait(ap, ATA_BUSY, 10);
3883 if (status & ATA_BUSY) {
Albert Lee14be71f2005-09-27 17:36:35 +08003884 ap->hsm_task_state = HSM_ST_POLL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003885 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3886 return;
3887 }
3888 }
3889
Albert Leefe79e682005-12-06 11:34:59 +08003890 /* check error */
3891 if (status & (ATA_ERR | ATA_DF)) {
3892 qc->err_mask |= AC_ERR_DEV;
3893 ap->hsm_task_state = HSM_ST_ERR;
3894 return;
3895 }
3896
3897 /* transfer data if any */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003898 if (is_atapi_taskfile(&qc->tf)) {
Albert Leefe79e682005-12-06 11:34:59 +08003899 /* DRQ=0 means no more data to transfer */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003900 if ((status & ATA_DRQ) == 0) {
Albert Lee14be71f2005-09-27 17:36:35 +08003901 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003902 return;
3903 }
3904
3905 atapi_pio_bytes(qc);
3906 } else {
3907 /* handle BSY=0, DRQ=0 as error */
3908 if ((status & ATA_DRQ) == 0) {
Tejun Heo11a56d22006-01-23 13:09:36 +09003909 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08003910 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003911 return;
3912 }
3913
3914 ata_pio_sector(qc);
3915 }
3916}
3917
Tejun Heoc91af2c2006-04-02 18:51:53 +09003918static void ata_pio_error(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003919{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003920 struct ata_port *ap = qc->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003921
Albert Lee0565c262006-02-13 18:55:25 +08003922 if (qc->tf.command != ATA_CMD_PACKET)
Tejun Heof15a1da2006-05-15 20:57:56 +09003923 ata_dev_printk(qc->dev, KERN_WARNING, "PIO error\n");
Albert Lee0565c262006-02-13 18:55:25 +08003924
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05003925 /* make sure qc->err_mask is available to
Albert Lee1c848982005-12-05 15:40:15 +08003926 * know what's wrong and recover
3927 */
Tejun Heoa46314742006-02-11 19:11:13 +09003928 WARN_ON(qc->err_mask == 0);
Albert Lee1c848982005-12-05 15:40:15 +08003929
Albert Lee14be71f2005-09-27 17:36:35 +08003930 ap->hsm_task_state = HSM_ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003931
Albert Leea22e2eb2005-12-05 15:38:02 +08003932 ata_poll_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003933}
3934
3935static void ata_pio_task(void *_data)
3936{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003937 struct ata_queued_cmd *qc = _data;
3938 struct ata_port *ap = qc->ap;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003939 unsigned long timeout;
3940 int qc_completed;
3941
3942fsm_start:
3943 timeout = 0;
3944 qc_completed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003945
Albert Lee14be71f2005-09-27 17:36:35 +08003946 switch (ap->hsm_task_state) {
3947 case HSM_ST_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003948 return;
3949
Albert Lee14be71f2005-09-27 17:36:35 +08003950 case HSM_ST:
Tejun Heoc91af2c2006-04-02 18:51:53 +09003951 ata_pio_block(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003952 break;
3953
Albert Lee14be71f2005-09-27 17:36:35 +08003954 case HSM_ST_LAST:
Tejun Heoc91af2c2006-04-02 18:51:53 +09003955 qc_completed = ata_pio_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003956 break;
3957
Albert Lee14be71f2005-09-27 17:36:35 +08003958 case HSM_ST_POLL:
3959 case HSM_ST_LAST_POLL:
Tejun Heoc91af2c2006-04-02 18:51:53 +09003960 timeout = ata_pio_poll(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003961 break;
3962
Albert Lee14be71f2005-09-27 17:36:35 +08003963 case HSM_ST_TMOUT:
3964 case HSM_ST_ERR:
Tejun Heoc91af2c2006-04-02 18:51:53 +09003965 ata_pio_error(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003966 return;
3967 }
3968
3969 if (timeout)
Tejun Heoc91af2c2006-04-02 18:51:53 +09003970 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003971 else if (!qc_completed)
3972 goto fsm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973}
3974
Linus Torvalds1da177e2005-04-16 15:20:36 -07003975/**
Tejun Heo8061f5f2006-03-05 15:29:09 +09003976 * atapi_packet_task - Write CDB bytes to hardware
Tejun Heoc91af2c2006-04-02 18:51:53 +09003977 * @_data: qc in progress
Tejun Heo8061f5f2006-03-05 15:29:09 +09003978 *
3979 * When device has indicated its readiness to accept
3980 * a CDB, this function is called. Send the CDB.
3981 * If DMA is to be performed, exit immediately.
3982 * Otherwise, we are in polling mode, so poll
3983 * status under operation succeeds or fails.
3984 *
3985 * LOCKING:
3986 * Kernel thread context (may sleep)
3987 */
Tejun Heo8061f5f2006-03-05 15:29:09 +09003988static void atapi_packet_task(void *_data)
3989{
Tejun Heoc91af2c2006-04-02 18:51:53 +09003990 struct ata_queued_cmd *qc = _data;
3991 struct ata_port *ap = qc->ap;
Tejun Heo8061f5f2006-03-05 15:29:09 +09003992 u8 status;
3993
Tejun Heo8061f5f2006-03-05 15:29:09 +09003994 /* sleep-wait for BSY to clear */
3995 DPRINTK("busy wait\n");
3996 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3997 qc->err_mask |= AC_ERR_TIMEOUT;
3998 goto err_out;
3999 }
4000
4001 /* make sure DRQ is set */
4002 status = ata_chk_status(ap);
4003 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4004 qc->err_mask |= AC_ERR_HSM;
4005 goto err_out;
4006 }
4007
4008 /* send SCSI cdb */
4009 DPRINTK("send cdb\n");
4010 WARN_ON(qc->dev->cdb_len < 12);
4011
4012 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4013 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4014 unsigned long flags;
4015
4016 /* Once we're done issuing command and kicking bmdma,
4017 * irq handler takes over. To not lose irq, we need
4018 * to clear NOINTR flag before sending cdb, but
4019 * interrupt handler shouldn't be invoked before we're
4020 * finished. Hence, the following locking.
4021 */
4022 spin_lock_irqsave(&ap->host_set->lock, flags);
4023 ap->flags &= ~ATA_FLAG_NOINTR;
4024 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4025 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4026 ap->ops->bmdma_start(qc); /* initiate bmdma */
4027 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4028 } else {
4029 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4030
4031 /* PIO commands are handled by polling */
4032 ap->hsm_task_state = HSM_ST;
Tejun Heoc91af2c2006-04-02 18:51:53 +09004033 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Tejun Heo8061f5f2006-03-05 15:29:09 +09004034 }
4035
4036 return;
4037
4038err_out:
4039 ata_poll_qc_complete(qc);
4040}
4041
4042/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004043 * ata_qc_new - Request an available ATA command, for queueing
4044 * @ap: Port associated with device @dev
4045 * @dev: Device from whom we request an available command structure
4046 *
4047 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004048 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004049 */
4050
4051static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4052{
4053 struct ata_queued_cmd *qc = NULL;
4054 unsigned int i;
4055
Tejun Heoe3180492006-05-15 20:58:09 +09004056 /* no command while frozen */
4057 if (unlikely(ap->flags & ATA_FLAG_FROZEN))
4058 return NULL;
4059
Tejun Heo2ab7db12006-05-15 20:58:02 +09004060 /* the last tag is reserved for internal command. */
4061 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004062 if (!test_and_set_bit(i, &ap->qactive)) {
Tejun Heof69499f2006-05-15 20:58:03 +09004063 qc = __ata_qc_from_tag(ap, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004064 break;
4065 }
4066
4067 if (qc)
4068 qc->tag = i;
4069
4070 return qc;
4071}
4072
4073/**
4074 * ata_qc_new_init - Request an available ATA command, and initialize it
Linus Torvalds1da177e2005-04-16 15:20:36 -07004075 * @dev: Device from whom we request an available command structure
4076 *
4077 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004078 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004079 */
4080
Tejun Heo3373efd2006-05-15 20:57:53 +09004081struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082{
Tejun Heo3373efd2006-05-15 20:57:53 +09004083 struct ata_port *ap = dev->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004084 struct ata_queued_cmd *qc;
4085
4086 qc = ata_qc_new(ap);
4087 if (qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004088 qc->scsicmd = NULL;
4089 qc->ap = ap;
4090 qc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004091
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05004092 ata_qc_reinit(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004093 }
4094
4095 return qc;
4096}
4097
Linus Torvalds1da177e2005-04-16 15:20:36 -07004098/**
4099 * ata_qc_free - free unused ata_queued_cmd
4100 * @qc: Command to complete
4101 *
4102 * Designed to free unused ata_queued_cmd object
4103 * in case something prevents using it.
4104 *
4105 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004106 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004107 */
4108void ata_qc_free(struct ata_queued_cmd *qc)
4109{
Tejun Heo4ba946e2006-01-23 13:09:36 +09004110 struct ata_port *ap = qc->ap;
4111 unsigned int tag;
4112
Tejun Heoa46314742006-02-11 19:11:13 +09004113 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004114
Tejun Heo4ba946e2006-01-23 13:09:36 +09004115 qc->flags = 0;
4116 tag = qc->tag;
4117 if (likely(ata_tag_valid(tag))) {
Tejun Heo4ba946e2006-01-23 13:09:36 +09004118 qc->tag = ATA_TAG_POISON;
4119 clear_bit(tag, &ap->qactive);
4120 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004121}
4122
Tejun Heo76014422006-02-11 15:13:49 +09004123void __ata_qc_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004124{
Tejun Heoa46314742006-02-11 19:11:13 +09004125 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4126 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004127
4128 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4129 ata_sg_clean(qc);
4130
Tejun Heo7401abf2006-05-15 20:57:32 +09004131 /* command should be marked inactive atomically with qc completion */
4132 qc->ap->active_tag = ATA_TAG_POISON;
4133
Albert Lee3f3791d2005-08-16 14:25:38 +08004134 /* atapi: mark qc as inactive to prevent the interrupt handler
4135 * from completing the command twice later, before the error handler
4136 * is called. (when rc != 0 and atapi request sense is needed)
4137 */
4138 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4139
Linus Torvalds1da177e2005-04-16 15:20:36 -07004140 /* call completion callback */
Tejun Heo77853bf2006-01-23 13:09:36 +09004141 qc->complete_fn(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004142}
4143
Tejun Heof686bcb2006-05-15 20:58:05 +09004144/**
4145 * ata_qc_complete - Complete an active ATA command
4146 * @qc: Command to complete
4147 * @err_mask: ATA Status register contents
4148 *
4149 * Indicate to the mid and upper layers that an ATA
4150 * command has completed, with either an ok or not-ok status.
4151 *
4152 * LOCKING:
4153 * spin_lock_irqsave(host_set lock)
4154 */
4155void ata_qc_complete(struct ata_queued_cmd *qc)
4156{
4157 struct ata_port *ap = qc->ap;
4158
4159 /* XXX: New EH and old EH use different mechanisms to
4160 * synchronize EH with regular execution path.
4161 *
4162 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4163 * Normal execution path is responsible for not accessing a
4164 * failed qc. libata core enforces the rule by returning NULL
4165 * from ata_qc_from_tag() for failed qcs.
4166 *
4167 * Old EH depends on ata_qc_complete() nullifying completion
4168 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4169 * not synchronize with interrupt handler. Only PIO task is
4170 * taken care of.
4171 */
4172 if (ap->ops->error_handler) {
4173 WARN_ON(ap->flags & ATA_FLAG_FROZEN);
4174
4175 if (unlikely(qc->err_mask))
4176 qc->flags |= ATA_QCFLAG_FAILED;
4177
4178 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4179 if (!ata_tag_internal(qc->tag)) {
4180 /* always fill result TF for failed qc */
4181 ap->ops->tf_read(ap, &qc->result_tf);
4182 ata_qc_schedule_eh(qc);
4183 return;
4184 }
4185 }
4186
4187 /* read result TF if requested */
4188 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4189 ap->ops->tf_read(ap, &qc->result_tf);
4190
4191 __ata_qc_complete(qc);
4192 } else {
4193 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4194 return;
4195
4196 /* read result TF if failed or requested */
4197 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4198 ap->ops->tf_read(ap, &qc->result_tf);
4199
4200 __ata_qc_complete(qc);
4201 }
4202}
4203
Linus Torvalds1da177e2005-04-16 15:20:36 -07004204static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4205{
4206 struct ata_port *ap = qc->ap;
4207
4208 switch (qc->tf.protocol) {
4209 case ATA_PROT_DMA:
4210 case ATA_PROT_ATAPI_DMA:
4211 return 1;
4212
4213 case ATA_PROT_ATAPI:
4214 case ATA_PROT_PIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004215 if (ap->flags & ATA_FLAG_PIO_DMA)
4216 return 1;
4217
4218 /* fall through */
4219
4220 default:
4221 return 0;
4222 }
4223
4224 /* never reached */
4225}
4226
4227/**
4228 * ata_qc_issue - issue taskfile to device
4229 * @qc: command to issue to device
4230 *
4231 * Prepare an ATA command to submission to device.
4232 * This includes mapping the data into a DMA-able
4233 * area, filling in the S/G table, and finally
4234 * writing the taskfile to hardware, starting the command.
4235 *
4236 * LOCKING:
4237 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004238 */
Tejun Heo8e0e6942006-03-31 20:41:11 +09004239void ata_qc_issue(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004240{
4241 struct ata_port *ap = qc->ap;
4242
Tejun Heoe4a70e72006-03-31 20:36:47 +09004243 qc->ap->active_tag = qc->tag;
4244 qc->flags |= ATA_QCFLAG_ACTIVE;
4245
Linus Torvalds1da177e2005-04-16 15:20:36 -07004246 if (ata_should_dma_map(qc)) {
4247 if (qc->flags & ATA_QCFLAG_SG) {
4248 if (ata_sg_setup(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004249 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004250 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4251 if (ata_sg_setup_one(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09004252 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004253 }
4254 } else {
4255 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4256 }
4257
4258 ap->ops->qc_prep(qc);
4259
Tejun Heo8e0e6942006-03-31 20:41:11 +09004260 qc->err_mask |= ap->ops->qc_issue(qc);
4261 if (unlikely(qc->err_mask))
4262 goto err;
4263 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004264
Tejun Heo8e436af2006-01-23 13:09:36 +09004265sg_err:
4266 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Tejun Heo8e0e6942006-03-31 20:41:11 +09004267 qc->err_mask |= AC_ERR_SYSTEM;
4268err:
4269 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004270}
4271
4272/**
4273 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4274 * @qc: command to issue to device
4275 *
4276 * Using various libata functions and hooks, this function
4277 * starts an ATA command. ATA commands are grouped into
4278 * classes called "protocols", and issuing each type of protocol
4279 * is slightly different.
4280 *
Edward Falk0baab862005-06-02 18:17:13 -04004281 * May be used as the qc_issue() entry in ata_port_operations.
4282 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004283 * LOCKING:
4284 * spin_lock_irqsave(host_set lock)
4285 *
4286 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004287 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004288 */
4289
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004290unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004291{
4292 struct ata_port *ap = qc->ap;
4293
4294 ata_dev_select(ap, qc->dev->devno, 1, 0);
4295
4296 switch (qc->tf.protocol) {
4297 case ATA_PROT_NODATA:
Jeff Garzike5338252005-10-30 21:37:17 -05004298 ata_tf_to_host(ap, &qc->tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299 break;
4300
4301 case ATA_PROT_DMA:
4302 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4303 ap->ops->bmdma_setup(qc); /* set up bmdma */
4304 ap->ops->bmdma_start(qc); /* initiate bmdma */
4305 break;
4306
4307 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4308 ata_qc_set_polling(qc);
Jeff Garzike5338252005-10-30 21:37:17 -05004309 ata_tf_to_host(ap, &qc->tf);
Albert Lee14be71f2005-09-27 17:36:35 +08004310 ap->hsm_task_state = HSM_ST;
Tejun Heoc91af2c2006-04-02 18:51:53 +09004311 ata_port_queue_task(ap, ata_pio_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004312 break;
4313
4314 case ATA_PROT_ATAPI:
4315 ata_qc_set_polling(qc);
Jeff Garzike5338252005-10-30 21:37:17 -05004316 ata_tf_to_host(ap, &qc->tf);
Tejun Heoc91af2c2006-04-02 18:51:53 +09004317 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004318 break;
4319
4320 case ATA_PROT_ATAPI_NODATA:
Tejun Heoc1389502005-08-22 14:59:24 +09004321 ap->flags |= ATA_FLAG_NOINTR;
Jeff Garzike5338252005-10-30 21:37:17 -05004322 ata_tf_to_host(ap, &qc->tf);
Tejun Heoc91af2c2006-04-02 18:51:53 +09004323 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004324 break;
4325
4326 case ATA_PROT_ATAPI_DMA:
Tejun Heoc1389502005-08-22 14:59:24 +09004327 ap->flags |= ATA_FLAG_NOINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004328 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4329 ap->ops->bmdma_setup(qc); /* set up bmdma */
Tejun Heoc91af2c2006-04-02 18:51:53 +09004330 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004331 break;
4332
4333 default:
4334 WARN_ON(1);
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09004335 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004336 }
4337
4338 return 0;
4339}
4340
4341/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004342 * ata_host_intr - Handle host interrupt for given (port, task)
4343 * @ap: Port on which interrupt arrived (possibly...)
4344 * @qc: Taskfile currently active in engine
4345 *
4346 * Handle host interrupt for given queued command. Currently,
4347 * only DMA interrupts are handled. All other commands are
4348 * handled via polling with interrupts disabled (nIEN bit).
4349 *
4350 * LOCKING:
4351 * spin_lock_irqsave(host_set lock)
4352 *
4353 * RETURNS:
4354 * One if interrupt was handled, zero if not (shared irq).
4355 */
4356
4357inline unsigned int ata_host_intr (struct ata_port *ap,
4358 struct ata_queued_cmd *qc)
4359{
4360 u8 status, host_stat;
4361
4362 switch (qc->tf.protocol) {
4363
4364 case ATA_PROT_DMA:
4365 case ATA_PROT_ATAPI_DMA:
4366 case ATA_PROT_ATAPI:
4367 /* check status of DMA engine */
4368 host_stat = ap->ops->bmdma_status(ap);
4369 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4370
4371 /* if it's not our irq... */
4372 if (!(host_stat & ATA_DMA_INTR))
4373 goto idle_irq;
4374
4375 /* before we do anything else, clear DMA-Start bit */
Alan Coxb73fc892005-08-26 16:03:19 +01004376 ap->ops->bmdma_stop(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004377
4378 /* fall through */
4379
4380 case ATA_PROT_ATAPI_NODATA:
4381 case ATA_PROT_NODATA:
4382 /* check altstatus */
4383 status = ata_altstatus(ap);
4384 if (status & ATA_BUSY)
4385 goto idle_irq;
4386
4387 /* check main status, clearing INTRQ */
4388 status = ata_chk_status(ap);
4389 if (unlikely(status & ATA_BUSY))
4390 goto idle_irq;
4391 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4392 ap->id, qc->tf.protocol, status);
4393
4394 /* ack bmdma irq events */
4395 ap->ops->irq_clear(ap);
4396
4397 /* complete taskfile transaction */
Albert Leea22e2eb2005-12-05 15:38:02 +08004398 qc->err_mask |= ac_err_mask(status);
4399 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004400 break;
4401
4402 default:
4403 goto idle_irq;
4404 }
4405
4406 return 1; /* irq handled */
4407
4408idle_irq:
4409 ap->stats.idle_irq++;
4410
4411#ifdef ATA_IRQ_TRAP
4412 if ((ap->stats.idle_irq % 1000) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004413 ata_irq_ack(ap, 0); /* debug trap */
Tejun Heof15a1da2006-05-15 20:57:56 +09004414 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
Alan Cox23cfce82006-03-21 16:06:53 +00004415 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004416 }
4417#endif
4418 return 0; /* irq not handled */
4419}
4420
4421/**
4422 * ata_interrupt - Default ATA host interrupt handler
Jeff Garzik0cba6322005-05-30 19:49:12 -04004423 * @irq: irq line (unused)
4424 * @dev_instance: pointer to our ata_host_set information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004425 * @regs: unused
4426 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004427 * Default interrupt handler for PCI IDE devices. Calls
4428 * ata_host_intr() for each port that is not disabled.
4429 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004430 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004431 * Obtains host_set lock during operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004432 *
4433 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004434 * IRQ_NONE or IRQ_HANDLED.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004435 */
4436
4437irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4438{
4439 struct ata_host_set *host_set = dev_instance;
4440 unsigned int i;
4441 unsigned int handled = 0;
4442 unsigned long flags;
4443
4444 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4445 spin_lock_irqsave(&host_set->lock, flags);
4446
4447 for (i = 0; i < host_set->n_ports; i++) {
4448 struct ata_port *ap;
4449
4450 ap = host_set->ports[i];
Tejun Heoc1389502005-08-22 14:59:24 +09004451 if (ap &&
Tejun Heo198e0fe2006-04-02 18:51:52 +09004452 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004453 struct ata_queued_cmd *qc;
4454
4455 qc = ata_qc_from_tag(ap, ap->active_tag);
Albert Lee21b1ed72005-04-29 17:34:59 +08004456 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4457 (qc->flags & ATA_QCFLAG_ACTIVE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004458 handled |= ata_host_intr(ap, qc);
4459 }
4460 }
4461
4462 spin_unlock_irqrestore(&host_set->lock, flags);
4463
4464 return IRQ_RETVAL(handled);
4465}
4466
Tejun Heo34bf2172006-05-15 20:57:46 +09004467/**
4468 * sata_scr_valid - test whether SCRs are accessible
4469 * @ap: ATA port to test SCR accessibility for
4470 *
4471 * Test whether SCRs are accessible for @ap.
4472 *
4473 * LOCKING:
4474 * None.
4475 *
4476 * RETURNS:
4477 * 1 if SCRs are accessible, 0 otherwise.
4478 */
4479int sata_scr_valid(struct ata_port *ap)
4480{
4481 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4482}
4483
4484/**
4485 * sata_scr_read - read SCR register of the specified port
4486 * @ap: ATA port to read SCR for
4487 * @reg: SCR to read
4488 * @val: Place to store read value
4489 *
4490 * Read SCR register @reg of @ap into *@val. This function is
4491 * guaranteed to succeed if the cable type of the port is SATA
4492 * and the port implements ->scr_read.
4493 *
4494 * LOCKING:
4495 * None.
4496 *
4497 * RETURNS:
4498 * 0 on success, negative errno on failure.
4499 */
4500int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4501{
4502 if (sata_scr_valid(ap)) {
4503 *val = ap->ops->scr_read(ap, reg);
4504 return 0;
4505 }
4506 return -EOPNOTSUPP;
4507}
4508
4509/**
4510 * sata_scr_write - write SCR register of the specified port
4511 * @ap: ATA port to write SCR for
4512 * @reg: SCR to write
4513 * @val: value to write
4514 *
4515 * Write @val to SCR register @reg of @ap. This function is
4516 * guaranteed to succeed if the cable type of the port is SATA
4517 * and the port implements ->scr_read.
4518 *
4519 * LOCKING:
4520 * None.
4521 *
4522 * RETURNS:
4523 * 0 on success, negative errno on failure.
4524 */
4525int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4526{
4527 if (sata_scr_valid(ap)) {
4528 ap->ops->scr_write(ap, reg, val);
4529 return 0;
4530 }
4531 return -EOPNOTSUPP;
4532}
4533
4534/**
4535 * sata_scr_write_flush - write SCR register of the specified port and flush
4536 * @ap: ATA port to write SCR for
4537 * @reg: SCR to write
4538 * @val: value to write
4539 *
4540 * This function is identical to sata_scr_write() except that this
4541 * function performs flush after writing to the register.
4542 *
4543 * LOCKING:
4544 * None.
4545 *
4546 * RETURNS:
4547 * 0 on success, negative errno on failure.
4548 */
4549int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4550{
4551 if (sata_scr_valid(ap)) {
4552 ap->ops->scr_write(ap, reg, val);
4553 ap->ops->scr_read(ap, reg);
4554 return 0;
4555 }
4556 return -EOPNOTSUPP;
4557}
4558
4559/**
4560 * ata_port_online - test whether the given port is online
4561 * @ap: ATA port to test
4562 *
4563 * Test whether @ap is online. Note that this function returns 0
4564 * if online status of @ap cannot be obtained, so
4565 * ata_port_online(ap) != !ata_port_offline(ap).
4566 *
4567 * LOCKING:
4568 * None.
4569 *
4570 * RETURNS:
4571 * 1 if the port online status is available and online.
4572 */
4573int ata_port_online(struct ata_port *ap)
4574{
4575 u32 sstatus;
4576
4577 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4578 return 1;
4579 return 0;
4580}
4581
4582/**
4583 * ata_port_offline - test whether the given port is offline
4584 * @ap: ATA port to test
4585 *
4586 * Test whether @ap is offline. Note that this function returns
4587 * 0 if offline status of @ap cannot be obtained, so
4588 * ata_port_online(ap) != !ata_port_offline(ap).
4589 *
4590 * LOCKING:
4591 * None.
4592 *
4593 * RETURNS:
4594 * 1 if the port offline status is available and offline.
4595 */
4596int ata_port_offline(struct ata_port *ap)
4597{
4598 u32 sstatus;
4599
4600 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4601 return 1;
4602 return 0;
4603}
Edward Falk0baab862005-06-02 18:17:13 -04004604
Jens Axboe9b847542006-01-06 09:28:07 +01004605/*
4606 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4607 * without filling any other registers
4608 */
Tejun Heo3373efd2006-05-15 20:57:53 +09004609static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
Jens Axboe9b847542006-01-06 09:28:07 +01004610{
4611 struct ata_taskfile tf;
4612 int err;
4613
Tejun Heo3373efd2006-05-15 20:57:53 +09004614 ata_tf_init(dev, &tf);
Jens Axboe9b847542006-01-06 09:28:07 +01004615
4616 tf.command = cmd;
4617 tf.flags |= ATA_TFLAG_DEVICE;
4618 tf.protocol = ATA_PROT_NODATA;
4619
Tejun Heo3373efd2006-05-15 20:57:53 +09004620 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
Jens Axboe9b847542006-01-06 09:28:07 +01004621 if (err)
Tejun Heof15a1da2006-05-15 20:57:56 +09004622 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4623 __FUNCTION__, err);
Jens Axboe9b847542006-01-06 09:28:07 +01004624
4625 return err;
4626}
4627
Tejun Heo3373efd2006-05-15 20:57:53 +09004628static int ata_flush_cache(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004629{
4630 u8 cmd;
4631
4632 if (!ata_try_flush_cache(dev))
4633 return 0;
4634
4635 if (ata_id_has_flush_ext(dev->id))
4636 cmd = ATA_CMD_FLUSH_EXT;
4637 else
4638 cmd = ATA_CMD_FLUSH;
4639
Tejun Heo3373efd2006-05-15 20:57:53 +09004640 return ata_do_simple_cmd(dev, cmd);
Jens Axboe9b847542006-01-06 09:28:07 +01004641}
4642
Tejun Heo3373efd2006-05-15 20:57:53 +09004643static int ata_standby_drive(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004644{
Tejun Heo3373efd2006-05-15 20:57:53 +09004645 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
Jens Axboe9b847542006-01-06 09:28:07 +01004646}
4647
Tejun Heo3373efd2006-05-15 20:57:53 +09004648static int ata_start_drive(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004649{
Tejun Heo3373efd2006-05-15 20:57:53 +09004650 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
Jens Axboe9b847542006-01-06 09:28:07 +01004651}
4652
4653/**
4654 * ata_device_resume - wakeup a previously suspended devices
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004655 * @dev: the device to resume
Jens Axboe9b847542006-01-06 09:28:07 +01004656 *
4657 * Kick the drive back into action, by sending it an idle immediate
4658 * command and making sure its transfer mode matches between drive
4659 * and host.
4660 *
4661 */
Tejun Heo3373efd2006-05-15 20:57:53 +09004662int ata_device_resume(struct ata_device *dev)
Jens Axboe9b847542006-01-06 09:28:07 +01004663{
Tejun Heo3373efd2006-05-15 20:57:53 +09004664 struct ata_port *ap = dev->ap;
4665
Jens Axboe9b847542006-01-06 09:28:07 +01004666 if (ap->flags & ATA_FLAG_SUSPENDED) {
Tejun Heoe82cbdb2006-04-01 01:38:18 +09004667 struct ata_device *failed_dev;
Jens Axboe9b847542006-01-06 09:28:07 +01004668 ap->flags &= ~ATA_FLAG_SUSPENDED;
Tejun Heoe82cbdb2006-04-01 01:38:18 +09004669 while (ata_set_mode(ap, &failed_dev))
Tejun Heo3373efd2006-05-15 20:57:53 +09004670 ata_dev_disable(failed_dev);
Jens Axboe9b847542006-01-06 09:28:07 +01004671 }
Tejun Heoe1211e32006-04-01 01:38:18 +09004672 if (!ata_dev_enabled(dev))
Jens Axboe9b847542006-01-06 09:28:07 +01004673 return 0;
4674 if (dev->class == ATA_DEV_ATA)
Tejun Heo3373efd2006-05-15 20:57:53 +09004675 ata_start_drive(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01004676
4677 return 0;
4678}
4679
4680/**
4681 * ata_device_suspend - prepare a device for suspend
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004682 * @dev: the device to suspend
Jens Axboe9b847542006-01-06 09:28:07 +01004683 *
4684 * Flush the cache on the drive, if appropriate, then issue a
4685 * standbynow command.
Jens Axboe9b847542006-01-06 09:28:07 +01004686 */
Tejun Heo3373efd2006-05-15 20:57:53 +09004687int ata_device_suspend(struct ata_device *dev, pm_message_t state)
Jens Axboe9b847542006-01-06 09:28:07 +01004688{
Tejun Heo3373efd2006-05-15 20:57:53 +09004689 struct ata_port *ap = dev->ap;
4690
Tejun Heoe1211e32006-04-01 01:38:18 +09004691 if (!ata_dev_enabled(dev))
Jens Axboe9b847542006-01-06 09:28:07 +01004692 return 0;
4693 if (dev->class == ATA_DEV_ATA)
Tejun Heo3373efd2006-05-15 20:57:53 +09004694 ata_flush_cache(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01004695
Nigel Cunningham082776e2006-03-23 23:22:16 +10004696 if (state.event != PM_EVENT_FREEZE)
Tejun Heo3373efd2006-05-15 20:57:53 +09004697 ata_standby_drive(dev);
Jens Axboe9b847542006-01-06 09:28:07 +01004698 ap->flags |= ATA_FLAG_SUSPENDED;
4699 return 0;
4700}
4701
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004702/**
4703 * ata_port_start - Set port up for dma.
4704 * @ap: Port to initialize
4705 *
4706 * Called just after data structures for each port are
4707 * initialized. Allocates space for PRD table.
4708 *
4709 * May be used as the port_start() entry in ata_port_operations.
4710 *
4711 * LOCKING:
4712 * Inherited from caller.
4713 */
4714
Linus Torvalds1da177e2005-04-16 15:20:36 -07004715int ata_port_start (struct ata_port *ap)
4716{
Brian King2f1f6102006-03-23 17:30:15 -06004717 struct device *dev = ap->dev;
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004718 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004719
4720 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4721 if (!ap->prd)
4722 return -ENOMEM;
4723
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004724 rc = ata_pad_alloc(ap, dev);
4725 if (rc) {
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004726 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004727 return rc;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004728 }
4729
Linus Torvalds1da177e2005-04-16 15:20:36 -07004730 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4731
4732 return 0;
4733}
4734
Edward Falk0baab862005-06-02 18:17:13 -04004735
4736/**
4737 * ata_port_stop - Undo ata_port_start()
4738 * @ap: Port to shut down
4739 *
4740 * Frees the PRD table.
4741 *
4742 * May be used as the port_stop() entry in ata_port_operations.
4743 *
4744 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04004745 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04004746 */
4747
Linus Torvalds1da177e2005-04-16 15:20:36 -07004748void ata_port_stop (struct ata_port *ap)
4749{
Brian King2f1f6102006-03-23 17:30:15 -06004750 struct device *dev = ap->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004751
4752 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004753 ata_pad_free(ap, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004754}
4755
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04004756void ata_host_stop (struct ata_host_set *host_set)
4757{
4758 if (host_set->mmio_base)
4759 iounmap(host_set->mmio_base);
4760}
4761
4762
Linus Torvalds1da177e2005-04-16 15:20:36 -07004763/**
4764 * ata_host_remove - Unregister SCSI host structure with upper layers
4765 * @ap: Port to unregister
4766 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4767 *
4768 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04004769 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004770 */
4771
4772static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4773{
4774 struct Scsi_Host *sh = ap->host;
4775
4776 DPRINTK("ENTER\n");
4777
4778 if (do_unregister)
4779 scsi_remove_host(sh);
4780
4781 ap->ops->port_stop(ap);
4782}
4783
4784/**
4785 * ata_host_init - Initialize an ata_port structure
4786 * @ap: Structure to initialize
4787 * @host: associated SCSI mid-layer structure
4788 * @host_set: Collection of hosts to which @ap belongs
4789 * @ent: Probe information provided by low-level driver
4790 * @port_no: Port number associated with this ata_port
4791 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004792 * Initialize a new ata_port structure, and its associated
4793 * scsi_host.
4794 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004795 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004796 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004797 */
4798
4799static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4800 struct ata_host_set *host_set,
Jeff Garzik057ace52005-10-22 14:27:05 -04004801 const struct ata_probe_ent *ent, unsigned int port_no)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004802{
4803 unsigned int i;
4804
4805 host->max_id = 16;
4806 host->max_lun = 1;
4807 host->max_channel = 1;
4808 host->unique_id = ata_unique_id++;
4809 host->max_cmd_len = 12;
Christoph Hellwig12413192005-06-11 01:05:01 +02004810
Tejun Heo198e0fe2006-04-02 18:51:52 +09004811 ap->flags = ATA_FLAG_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004812 ap->id = host->unique_id;
4813 ap->host = host;
4814 ap->ctl = ATA_DEVCTL_OBS;
4815 ap->host_set = host_set;
Brian King2f1f6102006-03-23 17:30:15 -06004816 ap->dev = ent->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004817 ap->port_no = port_no;
4818 ap->hard_port_no =
4819 ent->legacy_mode ? ent->hard_port_no : port_no;
4820 ap->pio_mask = ent->pio_mask;
4821 ap->mwdma_mask = ent->mwdma_mask;
4822 ap->udma_mask = ent->udma_mask;
4823 ap->flags |= ent->host_flags;
4824 ap->ops = ent->port_ops;
Tejun Heo1c3fae42006-04-02 20:53:28 +09004825 ap->sata_spd_limit = UINT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004826 ap->active_tag = ATA_TAG_POISON;
4827 ap->last_ctl = 0xFF;
4828
Tejun Heo86e45b62006-03-05 15:29:09 +09004829 INIT_WORK(&ap->port_task, NULL, NULL);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09004830 INIT_LIST_HEAD(&ap->eh_done_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004831
Tejun Heo838df622006-05-15 20:57:44 +09004832 /* set cable type */
4833 ap->cbl = ATA_CBL_NONE;
4834 if (ap->flags & ATA_FLAG_SATA)
4835 ap->cbl = ATA_CBL_SATA;
4836
Tejun Heoacf356b2006-03-24 14:07:50 +09004837 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4838 struct ata_device *dev = &ap->device[i];
Tejun Heo38d87232006-05-15 20:57:51 +09004839 dev->ap = ap;
Tejun Heoacf356b2006-03-24 14:07:50 +09004840 dev->devno = i;
4841 dev->pio_mask = UINT_MAX;
4842 dev->mwdma_mask = UINT_MAX;
4843 dev->udma_mask = UINT_MAX;
4844 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004845
4846#ifdef ATA_IRQ_TRAP
4847 ap->stats.unhandled_irq = 1;
4848 ap->stats.idle_irq = 1;
4849#endif
4850
4851 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4852}
4853
4854/**
4855 * ata_host_add - Attach low-level ATA driver to system
4856 * @ent: Information provided by low-level driver
4857 * @host_set: Collections of ports to which we add
4858 * @port_no: Port number associated with this host
4859 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004860 * Attach low-level ATA driver to system.
4861 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004862 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004863 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004864 *
4865 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004866 * New ata_port on success, for NULL on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004867 */
4868
Jeff Garzik057ace52005-10-22 14:27:05 -04004869static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004870 struct ata_host_set *host_set,
4871 unsigned int port_no)
4872{
4873 struct Scsi_Host *host;
4874 struct ata_port *ap;
4875 int rc;
4876
4877 DPRINTK("ENTER\n");
Tejun Heoaec5c3c2006-03-25 01:33:34 +09004878
4879 if (!ent->port_ops->probe_reset &&
4880 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4881 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4882 port_no);
4883 return NULL;
4884 }
4885
Linus Torvalds1da177e2005-04-16 15:20:36 -07004886 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4887 if (!host)
4888 return NULL;
4889
Tejun Heo30afc842006-03-18 18:40:14 +09004890 host->transportt = &ata_scsi_transport_template;
4891
Jeff Garzik35bb94b2006-04-11 13:12:34 -04004892 ap = ata_shost_to_port(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004893
4894 ata_host_init(ap, host, host_set, ent, port_no);
4895
4896 rc = ap->ops->port_start(ap);
4897 if (rc)
4898 goto err_out;
4899
4900 return ap;
4901
4902err_out:
4903 scsi_host_put(host);
4904 return NULL;
4905}
4906
4907/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04004908 * ata_device_add - Register hardware device with ATA and SCSI layers
4909 * @ent: Probe information describing hardware device to be registered
4910 *
4911 * This function processes the information provided in the probe
4912 * information struct @ent, allocates the necessary ATA and SCSI
4913 * host information structures, initializes them, and registers
4914 * everything with requisite kernel subsystems.
4915 *
4916 * This function requests irqs, probes the ATA bus, and probes
4917 * the SCSI bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004918 *
4919 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004920 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004921 *
4922 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004923 * Number of ports registered. Zero on error (no ports registered).
Linus Torvalds1da177e2005-04-16 15:20:36 -07004924 */
4925
Jeff Garzik057ace52005-10-22 14:27:05 -04004926int ata_device_add(const struct ata_probe_ent *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004927{
4928 unsigned int count = 0, i;
4929 struct device *dev = ent->dev;
4930 struct ata_host_set *host_set;
4931
4932 DPRINTK("ENTER\n");
4933 /* alloc a container for our list of ATA ports (buses) */
Randy Dunlap57f3bda2005-10-28 20:37:23 -07004934 host_set = kzalloc(sizeof(struct ata_host_set) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07004935 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4936 if (!host_set)
4937 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004938 spin_lock_init(&host_set->lock);
4939
4940 host_set->dev = dev;
4941 host_set->n_ports = ent->n_ports;
4942 host_set->irq = ent->irq;
4943 host_set->mmio_base = ent->mmio_base;
4944 host_set->private_data = ent->private_data;
4945 host_set->ops = ent->port_ops;
Alan Cox5444a6f2006-03-27 18:58:20 +01004946 host_set->flags = ent->host_set_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004947
4948 /* register each port bound to this device */
4949 for (i = 0; i < ent->n_ports; i++) {
4950 struct ata_port *ap;
4951 unsigned long xfer_mode_mask;
4952
4953 ap = ata_host_add(ent, host_set, i);
4954 if (!ap)
4955 goto err_out;
4956
4957 host_set->ports[i] = ap;
4958 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4959 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4960 (ap->pio_mask << ATA_SHIFT_PIO);
4961
4962 /* print per-port info to dmesg */
Tejun Heof15a1da2006-05-15 20:57:56 +09004963 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
4964 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4965 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4966 ata_mode_string(xfer_mode_mask),
4967 ap->ioaddr.cmd_addr,
4968 ap->ioaddr.ctl_addr,
4969 ap->ioaddr.bmdma_addr,
4970 ent->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004971
4972 ata_chk_status(ap);
4973 host_set->ops->irq_clear(ap);
Tejun Heoe3180492006-05-15 20:58:09 +09004974 ata_eh_freeze_port(ap); /* freeze port before requesting IRQ */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004975 count++;
4976 }
4977
Randy Dunlap57f3bda2005-10-28 20:37:23 -07004978 if (!count)
4979 goto err_free_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004980
4981 /* obtain irq, that is shared between channels */
4982 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4983 DRV_NAME, host_set))
4984 goto err_out;
4985
4986 /* perform each probe synchronously */
4987 DPRINTK("probe begin\n");
4988 for (i = 0; i < count; i++) {
4989 struct ata_port *ap;
4990 int rc;
4991
4992 ap = host_set->ports[i];
4993
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004994 DPRINTK("ata%u: bus probe begin\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004995 rc = ata_bus_probe(ap);
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004996 DPRINTK("ata%u: bus probe end\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004997
4998 if (rc) {
4999 /* FIXME: do something useful here?
5000 * Current libata behavior will
5001 * tear down everything when
5002 * the module is removed
5003 * or the h/w is unplugged.
5004 */
5005 }
5006
5007 rc = scsi_add_host(ap->host, dev);
5008 if (rc) {
Tejun Heof15a1da2006-05-15 20:57:56 +09005009 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005010 /* FIXME: do something useful here */
5011 /* FIXME: handle unconditional calls to
5012 * scsi_scan_host and ata_host_remove, below,
5013 * at the very least
5014 */
5015 }
5016 }
5017
5018 /* probes are done, now scan each port's disk(s) */
Randy Dunlapc893a3a2006-01-28 13:15:32 -05005019 DPRINTK("host probe begin\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005020 for (i = 0; i < count; i++) {
5021 struct ata_port *ap = host_set->ports[i];
5022
Jeff Garzik644dd0c2005-10-03 15:55:19 -04005023 ata_scsi_scan_host(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005024 }
5025
5026 dev_set_drvdata(dev, host_set);
5027
5028 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5029 return ent->n_ports; /* success */
5030
5031err_out:
5032 for (i = 0; i < count; i++) {
5033 ata_host_remove(host_set->ports[i], 1);
5034 scsi_host_put(host_set->ports[i]->host);
5035 }
Randy Dunlap57f3bda2005-10-28 20:37:23 -07005036err_free_ret:
Linus Torvalds1da177e2005-04-16 15:20:36 -07005037 kfree(host_set);
5038 VPRINTK("EXIT, returning 0\n");
5039 return 0;
5040}
5041
5042/**
Alan Cox17b14452005-09-15 15:44:00 +01005043 * ata_host_set_remove - PCI layer callback for device removal
5044 * @host_set: ATA host set that was removed
5045 *
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05005046 * Unregister all objects associated with this host set. Free those
Alan Cox17b14452005-09-15 15:44:00 +01005047 * objects.
5048 *
5049 * LOCKING:
5050 * Inherited from calling layer (may sleep).
5051 */
5052
Alan Cox17b14452005-09-15 15:44:00 +01005053void ata_host_set_remove(struct ata_host_set *host_set)
5054{
5055 struct ata_port *ap;
5056 unsigned int i;
5057
5058 for (i = 0; i < host_set->n_ports; i++) {
5059 ap = host_set->ports[i];
5060 scsi_remove_host(ap->host);
5061 }
5062
5063 free_irq(host_set->irq, host_set);
5064
5065 for (i = 0; i < host_set->n_ports; i++) {
5066 ap = host_set->ports[i];
5067
5068 ata_scsi_release(ap->host);
5069
5070 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5071 struct ata_ioports *ioaddr = &ap->ioaddr;
5072
5073 if (ioaddr->cmd_addr == 0x1f0)
5074 release_region(0x1f0, 8);
5075 else if (ioaddr->cmd_addr == 0x170)
5076 release_region(0x170, 8);
5077 }
5078
5079 scsi_host_put(ap->host);
5080 }
5081
5082 if (host_set->ops->host_stop)
5083 host_set->ops->host_stop(host_set);
5084
5085 kfree(host_set);
5086}
5087
5088/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005089 * ata_scsi_release - SCSI layer callback hook for host unload
5090 * @host: libata host to be unloaded
5091 *
5092 * Performs all duties necessary to shut down a libata port...
5093 * Kill port kthread, disable port, and release resources.
5094 *
5095 * LOCKING:
5096 * Inherited from SCSI layer.
5097 *
5098 * RETURNS:
5099 * One.
5100 */
5101
5102int ata_scsi_release(struct Scsi_Host *host)
5103{
Jeff Garzik35bb94b2006-04-11 13:12:34 -04005104 struct ata_port *ap = ata_shost_to_port(host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005105
5106 DPRINTK("ENTER\n");
5107
5108 ap->ops->port_disable(ap);
5109 ata_host_remove(ap, 0);
5110
5111 DPRINTK("EXIT\n");
5112 return 1;
5113}
5114
5115/**
5116 * ata_std_ports - initialize ioaddr with standard port offsets.
5117 * @ioaddr: IO address structure to be initialized
Edward Falk0baab862005-06-02 18:17:13 -04005118 *
5119 * Utility function which initializes data_addr, error_addr,
5120 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5121 * device_addr, status_addr, and command_addr to standard offsets
5122 * relative to cmd_addr.
5123 *
5124 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005125 */
Edward Falk0baab862005-06-02 18:17:13 -04005126
Linus Torvalds1da177e2005-04-16 15:20:36 -07005127void ata_std_ports(struct ata_ioports *ioaddr)
5128{
5129 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5130 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5131 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5132 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5133 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5134 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5135 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5136 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5137 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5138 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5139}
5140
Edward Falk0baab862005-06-02 18:17:13 -04005141
Jeff Garzik374b1872005-08-30 05:42:52 -04005142#ifdef CONFIG_PCI
5143
5144void ata_pci_host_stop (struct ata_host_set *host_set)
5145{
5146 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5147
5148 pci_iounmap(pdev, host_set->mmio_base);
5149}
5150
Edward Falk0baab862005-06-02 18:17:13 -04005151/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005152 * ata_pci_remove_one - PCI layer callback for device removal
5153 * @pdev: PCI device that was removed
5154 *
5155 * PCI layer indicates to libata via this hook that
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04005156 * hot-unplug or module unload event has occurred.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005157 * Handle this by unregistering all objects associated
5158 * with this PCI device. Free those objects. Then finally
5159 * release PCI resources and disable device.
5160 *
5161 * LOCKING:
5162 * Inherited from PCI layer (may sleep).
5163 */
5164
5165void ata_pci_remove_one (struct pci_dev *pdev)
5166{
5167 struct device *dev = pci_dev_to_dev(pdev);
5168 struct ata_host_set *host_set = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005169
Alan Cox17b14452005-09-15 15:44:00 +01005170 ata_host_set_remove(host_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005171 pci_release_regions(pdev);
5172 pci_disable_device(pdev);
5173 dev_set_drvdata(dev, NULL);
5174}
5175
5176/* move to PCI subsystem */
Jeff Garzik057ace52005-10-22 14:27:05 -04005177int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005178{
5179 unsigned long tmp = 0;
5180
5181 switch (bits->width) {
5182 case 1: {
5183 u8 tmp8 = 0;
5184 pci_read_config_byte(pdev, bits->reg, &tmp8);
5185 tmp = tmp8;
5186 break;
5187 }
5188 case 2: {
5189 u16 tmp16 = 0;
5190 pci_read_config_word(pdev, bits->reg, &tmp16);
5191 tmp = tmp16;
5192 break;
5193 }
5194 case 4: {
5195 u32 tmp32 = 0;
5196 pci_read_config_dword(pdev, bits->reg, &tmp32);
5197 tmp = tmp32;
5198 break;
5199 }
5200
5201 default:
5202 return -EINVAL;
5203 }
5204
5205 tmp &= bits->mask;
5206
5207 return (tmp == bits->val) ? 1 : 0;
5208}
Jens Axboe9b847542006-01-06 09:28:07 +01005209
5210int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5211{
5212 pci_save_state(pdev);
5213 pci_disable_device(pdev);
5214 pci_set_power_state(pdev, PCI_D3hot);
5215 return 0;
5216}
5217
5218int ata_pci_device_resume(struct pci_dev *pdev)
5219{
5220 pci_set_power_state(pdev, PCI_D0);
5221 pci_restore_state(pdev);
5222 pci_enable_device(pdev);
5223 pci_set_master(pdev);
5224 return 0;
5225}
Linus Torvalds1da177e2005-04-16 15:20:36 -07005226#endif /* CONFIG_PCI */
5227
5228
Linus Torvalds1da177e2005-04-16 15:20:36 -07005229static int __init ata_init(void)
5230{
5231 ata_wq = create_workqueue("ata");
5232 if (!ata_wq)
5233 return -ENOMEM;
5234
5235 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5236 return 0;
5237}
5238
5239static void __exit ata_exit(void)
5240{
5241 destroy_workqueue(ata_wq);
5242}
5243
5244module_init(ata_init);
5245module_exit(ata_exit);
5246
Jeff Garzik67846b32005-10-05 02:58:32 -04005247static unsigned long ratelimit_time;
5248static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5249
5250int ata_ratelimit(void)
5251{
5252 int rc;
5253 unsigned long flags;
5254
5255 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5256
5257 if (time_after(jiffies, ratelimit_time)) {
5258 rc = 1;
5259 ratelimit_time = jiffies + (HZ/5);
5260 } else
5261 rc = 0;
5262
5263 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5264
5265 return rc;
5266}
5267
Tejun Heoc22daff2006-04-11 22:22:29 +09005268/**
5269 * ata_wait_register - wait until register value changes
5270 * @reg: IO-mapped register
5271 * @mask: Mask to apply to read register value
5272 * @val: Wait condition
5273 * @interval_msec: polling interval in milliseconds
5274 * @timeout_msec: timeout in milliseconds
5275 *
5276 * Waiting for some bits of register to change is a common
5277 * operation for ATA controllers. This function reads 32bit LE
5278 * IO-mapped register @reg and tests for the following condition.
5279 *
5280 * (*@reg & mask) != val
5281 *
5282 * If the condition is met, it returns; otherwise, the process is
5283 * repeated after @interval_msec until timeout.
5284 *
5285 * LOCKING:
5286 * Kernel thread context (may sleep)
5287 *
5288 * RETURNS:
5289 * The final register value.
5290 */
5291u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5292 unsigned long interval_msec,
5293 unsigned long timeout_msec)
5294{
5295 unsigned long timeout;
5296 u32 tmp;
5297
5298 tmp = ioread32(reg);
5299
5300 /* Calculate timeout _after_ the first read to make sure
5301 * preceding writes reach the controller before starting to
5302 * eat away the timeout.
5303 */
5304 timeout = jiffies + (timeout_msec * HZ) / 1000;
5305
5306 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5307 msleep(interval_msec);
5308 tmp = ioread32(reg);
5309 }
5310
5311 return tmp;
5312}
5313
Linus Torvalds1da177e2005-04-16 15:20:36 -07005314/*
5315 * libata is essentially a library of internal helper functions for
5316 * low-level ATA host controller drivers. As such, the API/ABI is
5317 * likely to change as new drivers are added and updated.
5318 * Do not depend on ABI/API stability.
5319 */
5320
5321EXPORT_SYMBOL_GPL(ata_std_bios_param);
5322EXPORT_SYMBOL_GPL(ata_std_ports);
5323EXPORT_SYMBOL_GPL(ata_device_add);
Alan Cox17b14452005-09-15 15:44:00 +01005324EXPORT_SYMBOL_GPL(ata_host_set_remove);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005325EXPORT_SYMBOL_GPL(ata_sg_init);
5326EXPORT_SYMBOL_GPL(ata_sg_init_one);
Tejun Heof686bcb2006-05-15 20:58:05 +09005327EXPORT_SYMBOL_GPL(ata_qc_complete);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005328EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005329EXPORT_SYMBOL_GPL(ata_tf_load);
5330EXPORT_SYMBOL_GPL(ata_tf_read);
5331EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5332EXPORT_SYMBOL_GPL(ata_std_dev_select);
5333EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5334EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5335EXPORT_SYMBOL_GPL(ata_check_status);
5336EXPORT_SYMBOL_GPL(ata_altstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005337EXPORT_SYMBOL_GPL(ata_exec_command);
5338EXPORT_SYMBOL_GPL(ata_port_start);
5339EXPORT_SYMBOL_GPL(ata_port_stop);
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04005340EXPORT_SYMBOL_GPL(ata_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005341EXPORT_SYMBOL_GPL(ata_interrupt);
5342EXPORT_SYMBOL_GPL(ata_qc_prep);
Brian Kinge46834c2006-03-17 17:04:03 -06005343EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005344EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5345EXPORT_SYMBOL_GPL(ata_bmdma_start);
5346EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5347EXPORT_SYMBOL_GPL(ata_bmdma_status);
5348EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5349EXPORT_SYMBOL_GPL(ata_port_probe);
Tejun Heo3c567b72006-05-15 20:57:23 +09005350EXPORT_SYMBOL_GPL(sata_set_spd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005351EXPORT_SYMBOL_GPL(sata_phy_reset);
5352EXPORT_SYMBOL_GPL(__sata_phy_reset);
5353EXPORT_SYMBOL_GPL(ata_bus_reset);
Tejun Heo8a19ac82006-02-02 18:20:00 +09005354EXPORT_SYMBOL_GPL(ata_std_probeinit);
Tejun Heoc2bd5802006-01-24 17:05:22 +09005355EXPORT_SYMBOL_GPL(ata_std_softreset);
5356EXPORT_SYMBOL_GPL(sata_std_hardreset);
5357EXPORT_SYMBOL_GPL(ata_std_postreset);
5358EXPORT_SYMBOL_GPL(ata_std_probe_reset);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09005359EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
Tejun Heo623a3122006-03-05 17:55:58 +09005360EXPORT_SYMBOL_GPL(ata_dev_revalidate);
Jeff Garzik2e9edbf2006-03-24 09:56:57 -05005361EXPORT_SYMBOL_GPL(ata_dev_classify);
5362EXPORT_SYMBOL_GPL(ata_dev_pair);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005363EXPORT_SYMBOL_GPL(ata_port_disable);
Jeff Garzik67846b32005-10-05 02:58:32 -04005364EXPORT_SYMBOL_GPL(ata_ratelimit);
Tejun Heoc22daff2006-04-11 22:22:29 +09005365EXPORT_SYMBOL_GPL(ata_wait_register);
Tejun Heo6f8b9952006-01-24 17:05:21 +09005366EXPORT_SYMBOL_GPL(ata_busy_sleep);
Tejun Heo86e45b62006-03-05 15:29:09 +09005367EXPORT_SYMBOL_GPL(ata_port_queue_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005368EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5369EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005370EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5371EXPORT_SYMBOL_GPL(ata_scsi_release);
5372EXPORT_SYMBOL_GPL(ata_host_intr);
Tejun Heo34bf2172006-05-15 20:57:46 +09005373EXPORT_SYMBOL_GPL(sata_scr_valid);
5374EXPORT_SYMBOL_GPL(sata_scr_read);
5375EXPORT_SYMBOL_GPL(sata_scr_write);
5376EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5377EXPORT_SYMBOL_GPL(ata_port_online);
5378EXPORT_SYMBOL_GPL(ata_port_offline);
Tejun Heo6a62a042006-02-13 10:02:46 +09005379EXPORT_SYMBOL_GPL(ata_id_string);
5380EXPORT_SYMBOL_GPL(ata_id_c_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005381EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5382
Alan Cox1bc4ccf2006-01-09 17:18:14 +00005383EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
Alan Cox452503f2005-10-21 19:01:32 -04005384EXPORT_SYMBOL_GPL(ata_timing_compute);
5385EXPORT_SYMBOL_GPL(ata_timing_merge);
5386
Linus Torvalds1da177e2005-04-16 15:20:36 -07005387#ifdef CONFIG_PCI
5388EXPORT_SYMBOL_GPL(pci_test_config_bits);
Jeff Garzik374b1872005-08-30 05:42:52 -04005389EXPORT_SYMBOL_GPL(ata_pci_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005390EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5391EXPORT_SYMBOL_GPL(ata_pci_init_one);
5392EXPORT_SYMBOL_GPL(ata_pci_remove_one);
Jens Axboe9b847542006-01-06 09:28:07 +01005393EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5394EXPORT_SYMBOL_GPL(ata_pci_device_resume);
Alan Cox67951ad2006-03-22 15:55:54 +00005395EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5396EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005397#endif /* CONFIG_PCI */
Jens Axboe9b847542006-01-06 09:28:07 +01005398
5399EXPORT_SYMBOL_GPL(ata_device_suspend);
5400EXPORT_SYMBOL_GPL(ata_device_resume);
5401EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5402EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
Tejun Heoece1d632006-04-02 18:51:53 +09005403
Tejun Heoece1d632006-04-02 18:51:53 +09005404EXPORT_SYMBOL_GPL(ata_eng_timeout);
Tejun Heo7b70fc02006-05-15 20:58:07 +09005405EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
5406EXPORT_SYMBOL_GPL(ata_port_abort);
Tejun Heoe3180492006-05-15 20:58:09 +09005407EXPORT_SYMBOL_GPL(ata_port_freeze);
5408EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
5409EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
Tejun Heoece1d632006-04-02 18:51:53 +09005410EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5411EXPORT_SYMBOL_GPL(ata_eh_qc_retry);