1 /*
2 * 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 *
33 * Standards documents from:
34 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
35 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
36 * http://www.sata-io.org (SATA)
37 * http://www.compactflash.org (CF)
38 * http://www.qic.org (QIC157 - Tape and DSC)
39 * http://www.ce-ata.org (CE-ATA: not supported)
40 *
41 */
42
43 #include <linux/kernel.h>
44 #include <linux/module.h>
45 #include <linux/pci.h>
46 #include <linux/init.h>
47 #include <linux/list.h>
48 #include <linux/mm.h>
49 #include <linux/spinlock.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/timer.h>
53 #include <linux/interrupt.h>
54 #include <linux/completion.h>
55 #include <linux/suspend.h>
56 #include <linux/workqueue.h>
57 #include <linux/scatterlist.h>
58 #include <linux/io.h>
59 #include <linux/async.h>
60 #include <linux/log2.h>
61 #include <scsi/scsi.h>
62 #include <scsi/scsi_cmnd.h>
63 #include <scsi/scsi_host.h>
64 #include <linux/libata.h>
65 #include <asm/byteorder.h>
66 #include <linux/cdrom.h>
67
68 #include "libata.h"
69
70
71 /* debounce timing parameters in msecs { interval, duration, timeout } */
72 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
73 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
74 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
75
76 const struct ata_port_operations ata_base_port_ops = {
77 .prereset = ata_std_prereset,
78 .postreset = ata_std_postreset,
79 .error_handler = ata_std_error_handler,
80 };
81
82 const struct ata_port_operations sata_port_ops = {
83 .inherits = &ata_base_port_ops,
84
85 .qc_defer = ata_std_qc_defer,
86 .hardreset = sata_std_hardreset,
87 };
88
89 static unsigned int ata_dev_init_params(struct ata_device *dev,
90 u16 heads, u16 sectors);
91 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
92 static unsigned int ata_dev_set_feature(struct ata_device *dev,
93 u8 enable, u8 feature);
94 static void ata_dev_xfermask(struct ata_device *dev);
95 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
96
97 unsigned int ata_print_id = 1;
98 static struct workqueue_struct *ata_wq;
99
100 struct workqueue_struct *ata_aux_wq;
101
102 struct ata_force_param {
103 const char *name;
104 unsigned int cbl;
105 int spd_limit;
106 unsigned long xfer_mask;
107 unsigned int horkage_on;
108 unsigned int horkage_off;
109 unsigned int lflags;
110 };
111
112 struct ata_force_ent {
113 int port;
114 int device;
115 struct ata_force_param param;
116 };
117
118 static struct ata_force_ent *ata_force_tbl;
119 static int ata_force_tbl_size;
120
121 static char ata_force_param_buf[PAGE_SIZE] __initdata;
122 /* param_buf is thrown away after initialization, disallow read */
123 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
124 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
125
126 static int atapi_enabled = 1;
127 module_param(atapi_enabled, int, 0444);
128 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
129
130 static int atapi_dmadir = 0;
131 module_param(atapi_dmadir, int, 0444);
132 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
133
134 int atapi_passthru16 = 1;
135 module_param(atapi_passthru16, int, 0444);
136 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
137
138 int libata_fua = 0;
139 module_param_named(fua, libata_fua, int, 0444);
140 MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
141
142 static int ata_ignore_hpa;
143 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
144 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
145
146 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
147 module_param_named(dma, libata_dma_mask, int, 0444);
148 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
149
150 static int ata_probe_timeout;
151 module_param(ata_probe_timeout, int, 0444);
152 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
153
154 int libata_noacpi = 0;
155 module_param_named(noacpi, libata_noacpi, int, 0444);
156 MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
157
158 int libata_allow_tpm = 0;
159 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
160 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
161
162 MODULE_AUTHOR("Jeff Garzik");
163 MODULE_DESCRIPTION("Library module for ATA devices");
164 MODULE_LICENSE("GPL");
165 MODULE_VERSION(DRV_VERSION);
166
167
168 static bool ata_sstatus_online(u32 sstatus)
169 {
170 return (sstatus & 0xf) == 0x3;
171 }
172
173 /**
174 * ata_link_next - link iteration helper
175 * @link: the previous link, NULL to start
176 * @ap: ATA port containing links to iterate
177 * @mode: iteration mode, one of ATA_LITER_*
178 *
179 * LOCKING:
180 * Host lock or EH context.
181 *
182 * RETURNS:
183 * Pointer to the next link.
184 */
185 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
186 enum ata_link_iter_mode mode)
187 {
188 BUG_ON(mode != ATA_LITER_EDGE &&
189 mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
190
191 /* NULL link indicates start of iteration */
192 if (!link)
193 switch (mode) {
194 case ATA_LITER_EDGE:
195 case ATA_LITER_PMP_FIRST:
196 if (sata_pmp_attached(ap))
197 return ap->pmp_link;
198 /* fall through */
199 case ATA_LITER_HOST_FIRST:
200 return &ap->link;
201 }
202
203 /* we just iterated over the host link, what's next? */
204 if (link == &ap->link)
205 switch (mode) {
206 case ATA_LITER_HOST_FIRST:
207 if (sata_pmp_attached(ap))
208 return ap->pmp_link;
209 /* fall through */
210 case ATA_LITER_PMP_FIRST:
211 if (unlikely(ap->slave_link))
212 return ap->slave_link;
213 /* fall through */
214 case ATA_LITER_EDGE:
215 return NULL;
216 }
217
218 /* slave_link excludes PMP */
219 if (unlikely(link == ap->slave_link))
220 return NULL;
221
222 /* we were over a PMP link */
223 if (++link < ap->pmp_link + ap->nr_pmp_links)
224 return link;
225
226 if (mode == ATA_LITER_PMP_FIRST)
227 return &ap->link;
228
229 return NULL;
230 }
231
232 /**
233 * ata_dev_next - device iteration helper
234 * @dev: the previous device, NULL to start
235 * @link: ATA link containing devices to iterate
236 * @mode: iteration mode, one of ATA_DITER_*
237 *
238 * LOCKING:
239 * Host lock or EH context.
240 *
241 * RETURNS:
242 * Pointer to the next device.
243 */
244 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
245 enum ata_dev_iter_mode mode)
246 {
247 BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
248 mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
249
250 /* NULL dev indicates start of iteration */
251 if (!dev)
252 switch (mode) {
253 case ATA_DITER_ENABLED:
254 case ATA_DITER_ALL:
255 dev = link->device;
256 goto check;
257 case ATA_DITER_ENABLED_REVERSE:
258 case ATA_DITER_ALL_REVERSE:
259 dev = link->device + ata_link_max_devices(link) - 1;
260 goto check;
261 }
262
263 next:
264 /* move to the next one */
265 switch (mode) {
266 case ATA_DITER_ENABLED:
267 case ATA_DITER_ALL:
268 if (++dev < link->device + ata_link_max_devices(link))
269 goto check;
270 return NULL;
271 case ATA_DITER_ENABLED_REVERSE:
272 case ATA_DITER_ALL_REVERSE:
273 if (--dev >= link->device)
274 goto check;
275 return NULL;
276 }
277
278 check:
279 if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
280 !ata_dev_enabled(dev))
281 goto next;
282 return dev;
283 }
284
285 /**
286 * ata_dev_phys_link - find physical link for a device
287 * @dev: ATA device to look up physical link for
288 *
289 * Look up physical link which @dev is attached to. Note that
290 * this is different from @dev->link only when @dev is on slave
291 * link. For all other cases, it's the same as @dev->link.
292 *
293 * LOCKING:
294 * Don't care.
295 *
296 * RETURNS:
297 * Pointer to the found physical link.
298 */
299 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
300 {
301 struct ata_port *ap = dev->link->ap;
302
303 if (!ap->slave_link)
304 return dev->link;
305 if (!dev->devno)
306 return &ap->link;
307 return ap->slave_link;
308 }
309
310 /**
311 * ata_force_cbl - force cable type according to libata.force
312 * @ap: ATA port of interest
313 *
314 * Force cable type according to libata.force and whine about it.
315 * The last entry which has matching port number is used, so it
316 * can be specified as part of device force parameters. For
317 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
318 * same effect.
319 *
320 * LOCKING:
321 * EH context.
322 */
323 void ata_force_cbl(struct ata_port *ap)
324 {
325 int i;
326
327 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
328 const struct ata_force_ent *fe = &ata_force_tbl[i];
329
330 if (fe->port != -1 && fe->port != ap->print_id)
331 continue;
332
333 if (fe->param.cbl == ATA_CBL_NONE)
334 continue;
335
336 ap->cbl = fe->param.cbl;
337 ata_port_printk(ap, KERN_NOTICE,
338 "FORCE: cable set to %s\n", fe->param.name);
339 return;
340 }
341 }
342
343 /**
344 * ata_force_link_limits - force link limits according to libata.force
345 * @link: ATA link of interest
346 *
347 * Force link flags and SATA spd limit according to libata.force
348 * and whine about it. When only the port part is specified
349 * (e.g. 1:), the limit applies to all links connected to both
350 * the host link and all fan-out ports connected via PMP. If the
351 * device part is specified as 0 (e.g. 1.00:), it specifies the
352 * first fan-out link not the host link. Device number 15 always
353 * points to the host link whether PMP is attached or not. If the
354 * controller has slave link, device number 16 points to it.
355 *
356 * LOCKING:
357 * EH context.
358 */
359 static void ata_force_link_limits(struct ata_link *link)
360 {
361 bool did_spd = false;
362 int linkno = link->pmp;
363 int i;
364
365 if (ata_is_host_link(link))
366 linkno += 15;
367
368 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
369 const struct ata_force_ent *fe = &ata_force_tbl[i];
370
371 if (fe->port != -1 && fe->port != link->ap->print_id)
372 continue;
373
374 if (fe->device != -1 && fe->device != linkno)
375 continue;
376
377 /* only honor the first spd limit */
378 if (!did_spd && fe->param.spd_limit) {
379 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
380 ata_link_printk(link, KERN_NOTICE,
381 "FORCE: PHY spd limit set to %s\n",
382 fe->param.name);
383 did_spd = true;
384 }
385
386 /* let lflags stack */
387 if (fe->param.lflags) {
388 link->flags |= fe->param.lflags;
389 ata_link_printk(link, KERN_NOTICE,
390 "FORCE: link flag 0x%x forced -> 0x%x\n",
391 fe->param.lflags, link->flags);
392 }
393 }
394 }
395
396 /**
397 * ata_force_xfermask - force xfermask according to libata.force
398 * @dev: ATA device of interest
399 *
400 * Force xfer_mask according to libata.force and whine about it.
401 * For consistency with link selection, device number 15 selects
402 * the first device connected to the host link.
403 *
404 * LOCKING:
405 * EH context.
406 */
407 static void ata_force_xfermask(struct ata_device *dev)
408 {
409 int devno = dev->link->pmp + dev->devno;
410 int alt_devno = devno;
411 int i;
412
413 /* allow n.15/16 for devices attached to host port */
414 if (ata_is_host_link(dev->link))
415 alt_devno += 15;
416
417 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
418 const struct ata_force_ent *fe = &ata_force_tbl[i];
419 unsigned long pio_mask, mwdma_mask, udma_mask;
420
421 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
422 continue;
423
424 if (fe->device != -1 && fe->device != devno &&
425 fe->device != alt_devno)
426 continue;
427
428 if (!fe->param.xfer_mask)
429 continue;
430
431 ata_unpack_xfermask(fe->param.xfer_mask,
432 &pio_mask, &mwdma_mask, &udma_mask);
433 if (udma_mask)
434 dev->udma_mask = udma_mask;
435 else if (mwdma_mask) {
436 dev->udma_mask = 0;
437 dev->mwdma_mask = mwdma_mask;
438 } else {
439 dev->udma_mask = 0;
440 dev->mwdma_mask = 0;
441 dev->pio_mask = pio_mask;
442 }
443
444 ata_dev_printk(dev, KERN_NOTICE,
445 "FORCE: xfer_mask set to %s\n", fe->param.name);
446 return;
447 }
448 }
449
450 /**
451 * ata_force_horkage - force horkage according to libata.force
452 * @dev: ATA device of interest
453 *
454 * Force horkage according to libata.force and whine about it.
455 * For consistency with link selection, device number 15 selects
456 * the first device connected to the host link.
457 *
458 * LOCKING:
459 * EH context.
460 */
461 static void ata_force_horkage(struct ata_device *dev)
462 {
463 int devno = dev->link->pmp + dev->devno;
464 int alt_devno = devno;
465 int i;
466
467 /* allow n.15/16 for devices attached to host port */
468 if (ata_is_host_link(dev->link))
469 alt_devno += 15;
470
471 for (i = 0; i < ata_force_tbl_size; i++) {
472 const struct ata_force_ent *fe = &ata_force_tbl[i];
473
474 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
475 continue;
476
477 if (fe->device != -1 && fe->device != devno &&
478 fe->device != alt_devno)
479 continue;
480
481 if (!(~dev->horkage & fe->param.horkage_on) &&
482 !(dev->horkage & fe->param.horkage_off))
483 continue;
484
485 dev->horkage |= fe->param.horkage_on;
486 dev->horkage &= ~fe->param.horkage_off;
487
488 ata_dev_printk(dev, KERN_NOTICE,
489 "FORCE: horkage modified (%s)\n", fe->param.name);
490 }
491 }
492
493 /**
494 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
495 * @opcode: SCSI opcode
496 *
497 * Determine ATAPI command type from @opcode.
498 *
499 * LOCKING:
500 * None.
501 *
502 * RETURNS:
503 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
504 */
505 int atapi_cmd_type(u8 opcode)
506 {
507 switch (opcode) {
508 case GPCMD_READ_10:
509 case GPCMD_READ_12:
510 return ATAPI_READ;
511
512 case GPCMD_WRITE_10:
513 case GPCMD_WRITE_12:
514 case GPCMD_WRITE_AND_VERIFY_10:
515 return ATAPI_WRITE;
516
517 case GPCMD_READ_CD:
518 case GPCMD_READ_CD_MSF:
519 return ATAPI_READ_CD;
520
521 case ATA_16:
522 case ATA_12:
523 if (atapi_passthru16)
524 return ATAPI_PASS_THRU;
525 /* fall thru */
526 default:
527 return ATAPI_MISC;
528 }
529 }
530
531 /**
532 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
533 * @tf: Taskfile to convert
534 * @pmp: Port multiplier port
535 * @is_cmd: This FIS is for command
536 * @fis: Buffer into which data will output
537 *
538 * Converts a standard ATA taskfile to a Serial ATA
539 * FIS structure (Register - Host to Device).
540 *
541 * LOCKING:
542 * Inherited from caller.
543 */
544 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
545 {
546 fis[0] = 0x27; /* Register - Host to Device FIS */
547 fis[1] = pmp & 0xf; /* Port multiplier number*/
548 if (is_cmd)
549 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
550
551 fis[2] = tf->command;
552 fis[3] = tf->feature;
553
554 fis[4] = tf->lbal;
555 fis[5] = tf->lbam;
556 fis[6] = tf->lbah;
557 fis[7] = tf->device;
558
559 fis[8] = tf->hob_lbal;
560 fis[9] = tf->hob_lbam;
561 fis[10] = tf->hob_lbah;
562 fis[11] = tf->hob_feature;
563
564 fis[12] = tf->nsect;
565 fis[13] = tf->hob_nsect;
566 fis[14] = 0;
567 fis[15] = tf->ctl;
568
569 fis[16] = 0;
570 fis[17] = 0;
571 fis[18] = 0;
572 fis[19] = 0;
573 }
574
575 /**
576 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
577 * @fis: Buffer from which data will be input
578 * @tf: Taskfile to output
579 *
580 * Converts a serial ATA FIS structure to a standard ATA taskfile.
581 *
582 * LOCKING:
583 * Inherited from caller.
584 */
585
586 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
587 {
588 tf->command = fis[2]; /* status */
589 tf->feature = fis[3]; /* error */
590
591 tf->lbal = fis[4];
592 tf->lbam = fis[5];
593 tf->lbah = fis[6];
594 tf->device = fis[7];
595
596 tf->hob_lbal = fis[8];
597 tf->hob_lbam = fis[9];
598 tf->hob_lbah = fis[10];
599
600 tf->nsect = fis[12];
601 tf->hob_nsect = fis[13];
602 }
603
604 static const u8 ata_rw_cmds[] = {
605 /* pio multi */
606 ATA_CMD_READ_MULTI,
607 ATA_CMD_WRITE_MULTI,
608 ATA_CMD_READ_MULTI_EXT,
609 ATA_CMD_WRITE_MULTI_EXT,
610 0,
611 0,
612 0,
613 ATA_CMD_WRITE_MULTI_FUA_EXT,
614 /* pio */
615 ATA_CMD_PIO_READ,
616 ATA_CMD_PIO_WRITE,
617 ATA_CMD_PIO_READ_EXT,
618 ATA_CMD_PIO_WRITE_EXT,
619 0,
620 0,
621 0,
622 0,
623 /* dma */
624 ATA_CMD_READ,
625 ATA_CMD_WRITE,
626 ATA_CMD_READ_EXT,
627 ATA_CMD_WRITE_EXT,
628 0,
629 0,
630 0,
631 ATA_CMD_WRITE_FUA_EXT
632 };
633
634 /**
635 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
636 * @tf: command to examine and configure
637 * @dev: device tf belongs to
638 *
639 * Examine the device configuration and tf->flags to calculate
640 * the proper read/write commands and protocol to use.
641 *
642 * LOCKING:
643 * caller.
644 */
645 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
646 {
647 u8 cmd;
648
649 int index, fua, lba48, write;
650
651 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
652 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
653 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
654
655 if (dev->flags & ATA_DFLAG_PIO) {
656 tf->protocol = ATA_PROT_PIO;
657 index = dev->multi_count ? 0 : 8;
658 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
659 /* Unable to use DMA due to host limitation */
660 tf->protocol = ATA_PROT_PIO;
661 index = dev->multi_count ? 0 : 8;
662 } else {
663 tf->protocol = ATA_PROT_DMA;
664 index = 16;
665 }
666
667 cmd = ata_rw_cmds[index + fua + lba48 + write];
668 if (cmd) {
669 tf->command = cmd;
670 return 0;
671 }
672 return -1;
673 }
674
675 /**
676 * ata_tf_read_block - Read block address from ATA taskfile
677 * @tf: ATA taskfile of interest
678 * @dev: ATA device @tf belongs to
679 *
680 * LOCKING:
681 * None.
682 *
683 * Read block address from @tf. This function can handle all
684 * three address formats - LBA, LBA48 and CHS. tf->protocol and
685 * flags select the address format to use.
686 *
687 * RETURNS:
688 * Block address read from @tf.
689 */
690 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
691 {
692 u64 block = 0;
693
694 if (tf->flags & ATA_TFLAG_LBA) {
695 if (tf->flags & ATA_TFLAG_LBA48) {
696 block |= (u64)tf->hob_lbah << 40;
697 block |= (u64)tf->hob_lbam << 32;
698 block |= (u64)tf->hob_lbal << 24;
699 } else
700 block |= (tf->device & 0xf) << 24;
701
702 block |= tf->lbah << 16;
703 block |= tf->lbam << 8;
704 block |= tf->lbal;
705 } else {
706 u32 cyl, head, sect;
707
708 cyl = tf->lbam | (tf->lbah << 8);
709 head = tf->device & 0xf;
710 sect = tf->lbal;
711
712 if (!sect) {
713 ata_dev_printk(dev, KERN_WARNING, "device reported "
714 "invalid CHS sector 0\n");
715 sect = 1; /* oh well */
716 }
717
718 block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
719 }
720
721 return block;
722 }
723
724 /**
725 * ata_build_rw_tf - Build ATA taskfile for given read/write request
726 * @tf: Target ATA taskfile
727 * @dev: ATA device @tf belongs to
728 * @block: Block address
729 * @n_block: Number of blocks
730 * @tf_flags: RW/FUA etc...
731 * @tag: tag
732 *
733 * LOCKING:
734 * None.
735 *
736 * Build ATA taskfile @tf for read/write request described by
737 * @block, @n_block, @tf_flags and @tag on @dev.
738 *
739 * RETURNS:
740 *
741 * 0 on success, -ERANGE if the request is too large for @dev,
742 * -EINVAL if the request is invalid.
743 */
744 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
745 u64 block, u32 n_block, unsigned int tf_flags,
746 unsigned int tag)
747 {
748 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
749 tf->flags |= tf_flags;
750
751 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
752 /* yay, NCQ */
753 if (!lba_48_ok(block, n_block))
754 return -ERANGE;
755
756 tf->protocol = ATA_PROT_NCQ;
757 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
758
759 if (tf->flags & ATA_TFLAG_WRITE)
760 tf->command = ATA_CMD_FPDMA_WRITE;
761 else
762 tf->command = ATA_CMD_FPDMA_READ;
763
764 tf->nsect = tag << 3;
765 tf->hob_feature = (n_block >> 8) & 0xff;
766 tf->feature = n_block & 0xff;
767
768 tf->hob_lbah = (block >> 40) & 0xff;
769 tf->hob_lbam = (block >> 32) & 0xff;
770 tf->hob_lbal = (block >> 24) & 0xff;
771 tf->lbah = (block >> 16) & 0xff;
772 tf->lbam = (block >> 8) & 0xff;
773 tf->lbal = block & 0xff;
774
775 tf->device = 1 << 6;
776 if (tf->flags & ATA_TFLAG_FUA)
777 tf->device |= 1 << 7;
778 } else if (dev->flags & ATA_DFLAG_LBA) {
779 tf->flags |= ATA_TFLAG_LBA;
780
781 if (lba_28_ok(block, n_block)) {
782 /* use LBA28 */
783 tf->device |= (block >> 24) & 0xf;
784 } else if (lba_48_ok(block, n_block)) {
785 if (!(dev->flags & ATA_DFLAG_LBA48))
786 return -ERANGE;
787
788 /* use LBA48 */
789 tf->flags |= ATA_TFLAG_LBA48;
790
791 tf->hob_nsect = (n_block >> 8) & 0xff;
792
793 tf->hob_lbah = (block >> 40) & 0xff;
794 tf->hob_lbam = (block >> 32) & 0xff;
795 tf->hob_lbal = (block >> 24) & 0xff;
796 } else
797 /* request too large even for LBA48 */
798 return -ERANGE;
799
800 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
801 return -EINVAL;
802
803 tf->nsect = n_block & 0xff;
804
805 tf->lbah = (block >> 16) & 0xff;
806 tf->lbam = (block >> 8) & 0xff;
807 tf->lbal = block & 0xff;
808
809 tf->device |= ATA_LBA;
810 } else {
811 /* CHS */
812 u32 sect, head, cyl, track;
813
814 /* The request -may- be too large for CHS addressing. */
815 if (!lba_28_ok(block, n_block))
816 return -ERANGE;
817
818 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
819 return -EINVAL;
820
821 /* Convert LBA to CHS */
822 track = (u32)block / dev->sectors;
823 cyl = track / dev->heads;
824 head = track % dev->heads;
825 sect = (u32)block % dev->sectors + 1;
826
827 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
828 (u32)block, track, cyl, head, sect);
829
830 /* Check whether the converted CHS can fit.
831 Cylinder: 0-65535
832 Head: 0-15
833 Sector: 1-255*/
834 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
835 return -ERANGE;
836
837 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
838 tf->lbal = sect;
839 tf->lbam = cyl;
840 tf->lbah = cyl >> 8;
841 tf->device |= head;
842 }
843
844 return 0;
845 }
846
847 /**
848 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
849 * @pio_mask: pio_mask
850 * @mwdma_mask: mwdma_mask
851 * @udma_mask: udma_mask
852 *
853 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
854 * unsigned int xfer_mask.
855 *
856 * LOCKING:
857 * None.
858 *
859 * RETURNS:
860 * Packed xfer_mask.
861 */
862 unsigned long ata_pack_xfermask(unsigned long pio_mask,
863 unsigned long mwdma_mask,
864 unsigned long udma_mask)
865 {
866 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
867 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
868 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
869 }
870
871 /**
872 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
873 * @xfer_mask: xfer_mask to unpack
874 * @pio_mask: resulting pio_mask
875 * @mwdma_mask: resulting mwdma_mask
876 * @udma_mask: resulting udma_mask
877 *
878 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
879 * Any NULL distination masks will be ignored.
880 */
881 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
882 unsigned long *mwdma_mask, unsigned long *udma_mask)
883 {
884 if (pio_mask)
885 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
886 if (mwdma_mask)
887 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
888 if (udma_mask)
889 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
890 }
891
892 static const struct ata_xfer_ent {
893 int shift, bits;
894 u8 base;
895 } ata_xfer_tbl[] = {
896 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
897 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
898 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
899 { -1, },
900 };
901
902 /**
903 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
904 * @xfer_mask: xfer_mask of interest
905 *
906 * Return matching XFER_* value for @xfer_mask. Only the highest
907 * bit of @xfer_mask is considered.
908 *
909 * LOCKING:
910 * None.
911 *
912 * RETURNS:
913 * Matching XFER_* value, 0xff if no match found.
914 */
915 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
916 {
917 int highbit = fls(xfer_mask) - 1;
918 const struct ata_xfer_ent *ent;
919
920 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
921 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
922 return ent->base + highbit - ent->shift;
923 return 0xff;
924 }
925
926 /**
927 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
928 * @xfer_mode: XFER_* of interest
929 *
930 * Return matching xfer_mask for @xfer_mode.
931 *
932 * LOCKING:
933 * None.
934 *
935 * RETURNS:
936 * Matching xfer_mask, 0 if no match found.
937 */
938 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
939 {
940 const struct ata_xfer_ent *ent;
941
942 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
943 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
944 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
945 & ~((1 << ent->shift) - 1);
946 return 0;
947 }
948
949 /**
950 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
951 * @xfer_mode: XFER_* of interest
952 *
953 * Return matching xfer_shift for @xfer_mode.
954 *
955 * LOCKING:
956 * None.
957 *
958 * RETURNS:
959 * Matching xfer_shift, -1 if no match found.
960 */
961 int ata_xfer_mode2shift(unsigned long xfer_mode)
962 {
963 const struct ata_xfer_ent *ent;
964
965 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
966 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
967 return ent->shift;
968 return -1;
969 }
970
971 /**
972 * ata_mode_string - convert xfer_mask to string
973 * @xfer_mask: mask of bits supported; only highest bit counts.
974 *
975 * Determine string which represents the highest speed
976 * (highest bit in @modemask).
977 *
978 * LOCKING:
979 * None.
980 *
981 * RETURNS:
982 * Constant C string representing highest speed listed in
983 * @mode_mask, or the constant C string "<n/a>".
984 */
985 const char *ata_mode_string(unsigned long xfer_mask)
986 {
987 static const char * const xfer_mode_str[] = {
988 "PIO0",
989 "PIO1",
990 "PIO2",
991 "PIO3",
992 "PIO4",
993 "PIO5",
994 "PIO6",
995 "MWDMA0",
996 "MWDMA1",
997 "MWDMA2",
998 "MWDMA3",
999 "MWDMA4",
1000 "UDMA/16",
1001 "UDMA/25",
1002 "UDMA/33",
1003 "UDMA/44",
1004 "UDMA/66",
1005 "UDMA/100",
1006 "UDMA/133",
1007 "UDMA7",
1008 };
1009 int highbit;
1010
1011 highbit = fls(xfer_mask) - 1;
1012 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
1013 return xfer_mode_str[highbit];
1014 return "<n/a>";
1015 }
1016
1017 static const char *sata_spd_string(unsigned int spd)
1018 {
1019 static const char * const spd_str[] = {
1020 "1.5 Gbps",
1021 "3.0 Gbps",
1022 "6.0 Gbps",
1023 };
1024
1025 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
1026 return "<unknown>";
1027 return spd_str[spd - 1];
1028 }
1029
1030 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
1031 {
1032 struct ata_link *link = dev->link;
1033 struct ata_port *ap = link->ap;
1034 u32 scontrol;
1035 unsigned int err_mask;
1036 int rc;
1037
1038 /*
1039 * disallow DIPM for drivers which haven't set
1040 * ATA_FLAG_IPM. This is because when DIPM is enabled,
1041 * phy ready will be set in the interrupt status on
1042 * state changes, which will cause some drivers to
1043 * think there are errors - additionally drivers will
1044 * need to disable hot plug.
1045 */
1046 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
1047 ap->pm_policy = NOT_AVAILABLE;
1048 return -EINVAL;
1049 }
1050
1051 /*
1052 * For DIPM, we will only enable it for the
1053 * min_power setting.
1054 *
1055 * Why? Because Disks are too stupid to know that
1056 * If the host rejects a request to go to SLUMBER
1057 * they should retry at PARTIAL, and instead it
1058 * just would give up. So, for medium_power to
1059 * work at all, we need to only allow HIPM.
1060 */
1061 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
1062 if (rc)
1063 return rc;
1064
1065 switch (policy) {
1066 case MIN_POWER:
1067 /* no restrictions on IPM transitions */
1068 scontrol &= ~(0x3 << 8);
1069 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1070 if (rc)
1071 return rc;
1072
1073 /* enable DIPM */
1074 if (dev->flags & ATA_DFLAG_DIPM)
1075 err_mask = ata_dev_set_feature(dev,
1076 SETFEATURES_SATA_ENABLE, SATA_DIPM);
1077 break;
1078 case MEDIUM_POWER:
1079 /* allow IPM to PARTIAL */
1080 scontrol &= ~(0x1 << 8);
1081 scontrol |= (0x2 << 8);
1082 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1083 if (rc)
1084 return rc;
1085
1086 /*
1087 * we don't have to disable DIPM since IPM flags
1088 * disallow transitions to SLUMBER, which effectively
1089 * disable DIPM if it does not support PARTIAL
1090 */
1091 break;
1092 case NOT_AVAILABLE:
1093 case MAX_PERFORMANCE:
1094 /* disable all IPM transitions */
1095 scontrol |= (0x3 << 8);
1096 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1097 if (rc)
1098 return rc;
1099
1100 /*
1101 * we don't have to disable DIPM since IPM flags
1102 * disallow all transitions which effectively
1103 * disable DIPM anyway.
1104 */
1105 break;
1106 }
1107
1108 /* FIXME: handle SET FEATURES failure */
1109 (void) err_mask;
1110
1111 return 0;
1112 }
1113
1114 /**
1115 * ata_dev_enable_pm - enable SATA interface power management
1116 * @dev: device to enable power management
1117 * @policy: the link power management policy
1118 *
1119 * Enable SATA Interface power management. This will enable
1120 * Device Interface Power Management (DIPM) for min_power
1121 * policy, and then call driver specific callbacks for
1122 * enabling Host Initiated Power management.
1123 *
1124 * Locking: Caller.
1125 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
1126 */
1127 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
1128 {
1129 int rc = 0;
1130 struct ata_port *ap = dev->link->ap;
1131
1132 /* set HIPM first, then DIPM */
1133 if (ap->ops->enable_pm)
1134 rc = ap->ops->enable_pm(ap, policy);
1135 if (rc)
1136 goto enable_pm_out;
1137 rc = ata_dev_set_dipm(dev, policy);
1138
1139 enable_pm_out:
1140 if (rc)
1141 ap->pm_policy = MAX_PERFORMANCE;
1142 else
1143 ap->pm_policy = policy;
1144 return /* rc */; /* hopefully we can use 'rc' eventually */
1145 }
1146
1147 #ifdef CONFIG_PM
1148 /**
1149 * ata_dev_disable_pm - disable SATA interface power management
1150 * @dev: device to disable power management
1151 *
1152 * Disable SATA Interface power management. This will disable
1153 * Device Interface Power Management (DIPM) without changing
1154 * policy, call driver specific callbacks for disabling Host
1155 * Initiated Power management.
1156 *
1157 * Locking: Caller.
1158 * Returns: void
1159 */
1160 static void ata_dev_disable_pm(struct ata_device *dev)
1161 {
1162 struct ata_port *ap = dev->link->ap;
1163
1164 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1165 if (ap->ops->disable_pm)
1166 ap->ops->disable_pm(ap);
1167 }
1168 #endif /* CONFIG_PM */
1169
1170 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1171 {
1172 ap->pm_policy = policy;
1173 ap->link.eh_info.action |= ATA_EH_LPM;
1174 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1175 ata_port_schedule_eh(ap);
1176 }
1177
1178 #ifdef CONFIG_PM
1179 static void ata_lpm_enable(struct ata_host *host)
1180 {
1181 struct ata_link *link;
1182 struct ata_port *ap;
1183 struct ata_device *dev;
1184 int i;
1185
1186 for (i = 0; i < host->n_ports; i++) {
1187 ap = host->ports[i];
1188 ata_for_each_link(link, ap, EDGE) {
1189 ata_for_each_dev(dev, link, ALL)
1190 ata_dev_disable_pm(dev);
1191 }
1192 }
1193 }
1194
1195 static void ata_lpm_disable(struct ata_host *host)
1196 {
1197 int i;
1198
1199 for (i = 0; i < host->n_ports; i++) {
1200 struct ata_port *ap = host->ports[i];
1201 ata_lpm_schedule(ap, ap->pm_policy);
1202 }
1203 }
1204 #endif /* CONFIG_PM */
1205
1206 /**
1207 * ata_dev_classify - determine device type based on ATA-spec signature
1208 * @tf: ATA taskfile register set for device to be identified
1209 *
1210 * Determine from taskfile register contents whether a device is
1211 * ATA or ATAPI, as per "Signature and persistence" section
1212 * of ATA/PI spec (volume 1, sect 5.14).
1213 *
1214 * LOCKING:
1215 * None.
1216 *
1217 * RETURNS:
1218 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1219 * %ATA_DEV_UNKNOWN the event of failure.
1220 */
1221 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1222 {
1223 /* Apple's open source Darwin code hints that some devices only
1224 * put a proper signature into the LBA mid/high registers,
1225 * So, we only check those. It's sufficient for uniqueness.
1226 *
1227 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1228 * signatures for ATA and ATAPI devices attached on SerialATA,
1229 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1230 * spec has never mentioned about using different signatures
1231 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1232 * Multiplier specification began to use 0x69/0x96 to identify
1233 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1234 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1235 * 0x69/0x96 shortly and described them as reserved for
1236 * SerialATA.
1237 *
1238 * We follow the current spec and consider that 0x69/0x96
1239 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1240 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1241 * SEMB signature. This is worked around in
1242 * ata_dev_read_id().
1243 */
1244 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1245 DPRINTK("found ATA device by sig\n");
1246 return ATA_DEV_ATA;
1247 }
1248
1249 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1250 DPRINTK("found ATAPI device by sig\n");
1251 return ATA_DEV_ATAPI;
1252 }
1253
1254 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1255 DPRINTK("found PMP device by sig\n");
1256 return ATA_DEV_PMP;
1257 }
1258
1259 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1260 DPRINTK("found SEMB device by sig (could be ATA device)\n");
1261 return ATA_DEV_SEMB;
1262 }
1263
1264 DPRINTK("unknown device\n");
1265 return ATA_DEV_UNKNOWN;
1266 }
1267
1268 /**
1269 * ata_id_string - Convert IDENTIFY DEVICE page into string
1270 * @id: IDENTIFY DEVICE results we will examine
1271 * @s: string into which data is output
1272 * @ofs: offset into identify device page
1273 * @len: length of string to return. must be an even number.
1274 *
1275 * The strings in the IDENTIFY DEVICE page are broken up into
1276 * 16-bit chunks. Run through the string, and output each
1277 * 8-bit chunk linearly, regardless of platform.
1278 *
1279 * LOCKING:
1280 * caller.
1281 */
1282
1283 void ata_id_string(const u16 *id, unsigned char *s,
1284 unsigned int ofs, unsigned int len)
1285 {
1286 unsigned int c;
1287
1288 BUG_ON(len & 1);
1289
1290 while (len > 0) {
1291 c = id[ofs] >> 8;
1292 *s = c;
1293 s++;
1294
1295 c = id[ofs] & 0xff;
1296 *s = c;
1297 s++;
1298
1299 ofs++;
1300 len -= 2;
1301 }
1302 }
1303
1304 /**
1305 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1306 * @id: IDENTIFY DEVICE results we will examine
1307 * @s: string into which data is output
1308 * @ofs: offset into identify device page
1309 * @len: length of string to return. must be an odd number.
1310 *
1311 * This function is identical to ata_id_string except that it
1312 * trims trailing spaces and terminates the resulting string with
1313 * null. @len must be actual maximum length (even number) + 1.
1314 *
1315 * LOCKING:
1316 * caller.
1317 */
1318 void ata_id_c_string(const u16 *id, unsigned char *s,
1319 unsigned int ofs, unsigned int len)
1320 {
1321 unsigned char *p;
1322
1323 ata_id_string(id, s, ofs, len - 1);
1324
1325 p = s + strnlen(s, len - 1);
1326 while (p > s && p[-1] == ' ')
1327 p--;
1328 *p = '\0';
1329 }
1330
1331 static u64 ata_id_n_sectors(const u16 *id)
1332 {
1333 if (ata_id_has_lba(id)) {
1334 if (ata_id_has_lba48(id))
1335 return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1336 else
1337 return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1338 } else {
1339 if (ata_id_current_chs_valid(id))
1340 return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1341 id[ATA_ID_CUR_SECTORS];
1342 else
1343 return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1344 id[ATA_ID_SECTORS];
1345 }
1346 }
1347
1348 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1349 {
1350 u64 sectors = 0;
1351
1352 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1353 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1354 sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1355 sectors |= (tf->lbah & 0xff) << 16;
1356 sectors |= (tf->lbam & 0xff) << 8;
1357 sectors |= (tf->lbal & 0xff);
1358
1359 return sectors;
1360 }
1361
1362 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1363 {
1364 u64 sectors = 0;
1365
1366 sectors |= (tf->device & 0x0f) << 24;
1367 sectors |= (tf->lbah & 0xff) << 16;
1368 sectors |= (tf->lbam & 0xff) << 8;
1369 sectors |= (tf->lbal & 0xff);
1370
1371 return sectors;
1372 }
1373
1374 /**
1375 * ata_read_native_max_address - Read native max address
1376 * @dev: target device
1377 * @max_sectors: out parameter for the result native max address
1378 *
1379 * Perform an LBA48 or LBA28 native size query upon the device in
1380 * question.
1381 *
1382 * RETURNS:
1383 * 0 on success, -EACCES if command is aborted by the drive.
1384 * -EIO on other errors.
1385 */
1386 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1387 {
1388 unsigned int err_mask;
1389 struct ata_taskfile tf;
1390 int lba48 = ata_id_has_lba48(dev->id);
1391
1392 ata_tf_init(dev, &tf);
1393
1394 /* always clear all address registers */
1395 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1396
1397 if (lba48) {
1398 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1399 tf.flags |= ATA_TFLAG_LBA48;
1400 } else
1401 tf.command = ATA_CMD_READ_NATIVE_MAX;
1402
1403 tf.protocol |= ATA_PROT_NODATA;
1404 tf.device |= ATA_LBA;
1405
1406 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1407 if (err_mask) {
1408 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1409 "max address (err_mask=0x%x)\n", err_mask);
1410 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1411 return -EACCES;
1412 return -EIO;
1413 }
1414
1415 if (lba48)
1416 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1417 else
1418 *max_sectors = ata_tf_to_lba(&tf) + 1;
1419 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1420 (*max_sectors)--;
1421 return 0;
1422 }
1423
1424 /**
1425 * ata_set_max_sectors - Set max sectors
1426 * @dev: target device
1427 * @new_sectors: new max sectors value to set for the device
1428 *
1429 * Set max sectors of @dev to @new_sectors.
1430 *
1431 * RETURNS:
1432 * 0 on success, -EACCES if command is aborted or denied (due to
1433 * previous non-volatile SET_MAX) by the drive. -EIO on other
1434 * errors.
1435 */
1436 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1437 {
1438 unsigned int err_mask;
1439 struct ata_taskfile tf;
1440 int lba48 = ata_id_has_lba48(dev->id);
1441
1442 new_sectors--;
1443
1444 ata_tf_init(dev, &tf);
1445
1446 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1447
1448 if (lba48) {
1449 tf.command = ATA_CMD_SET_MAX_EXT;
1450 tf.flags |= ATA_TFLAG_LBA48;
1451
1452 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1453 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1454 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1455 } else {
1456 tf.command = ATA_CMD_SET_MAX;
1457
1458 tf.device |= (new_sectors >> 24) & 0xf;
1459 }
1460
1461 tf.protocol |= ATA_PROT_NODATA;
1462 tf.device |= ATA_LBA;
1463
1464 tf.lbal = (new_sectors >> 0) & 0xff;
1465 tf.lbam = (new_sectors >> 8) & 0xff;
1466 tf.lbah = (new_sectors >> 16) & 0xff;
1467
1468 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1469 if (err_mask) {
1470 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1471 "max address (err_mask=0x%x)\n", err_mask);
1472 if (err_mask == AC_ERR_DEV &&
1473 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1474 return -EACCES;
1475 return -EIO;
1476 }
1477
1478 return 0;
1479 }
1480
1481 /**
1482 * ata_hpa_resize - Resize a device with an HPA set
1483 * @dev: Device to resize
1484 *
1485 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1486 * it if required to the full size of the media. The caller must check
1487 * the drive has the HPA feature set enabled.
1488 *
1489 * RETURNS:
1490 * 0 on success, -errno on failure.
1491 */
1492 static int ata_hpa_resize(struct ata_device *dev)
1493 {
1494 struct ata_eh_context *ehc = &dev->link->eh_context;
1495 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1496 u64 sectors = ata_id_n_sectors(dev->id);
1497 u64 native_sectors;
1498 int rc;
1499
1500 /* do we need to do it? */
1501 if (dev->class != ATA_DEV_ATA ||
1502 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1503 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1504 return 0;
1505
1506 /* read native max address */
1507 rc = ata_read_native_max_address(dev, &native_sectors);
1508 if (rc) {
1509 /* If device aborted the command or HPA isn't going to
1510 * be unlocked, skip HPA resizing.
1511 */
1512 if (rc == -EACCES || !ata_ignore_hpa) {
1513 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1514 "broken, skipping HPA handling\n");
1515 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1516
1517 /* we can continue if device aborted the command */
1518 if (rc == -EACCES)
1519 rc = 0;
1520 }
1521
1522 return rc;
1523 }
1524 dev->n_native_sectors = native_sectors;
1525
1526 /* nothing to do? */
1527 if (native_sectors <= sectors || !ata_ignore_hpa) {
1528 if (!print_info || native_sectors == sectors)
1529 return 0;
1530
1531 if (native_sectors > sectors)
1532 ata_dev_printk(dev, KERN_INFO,
1533 "HPA detected: current %llu, native %llu\n",
1534 (unsigned long long)sectors,
1535 (unsigned long long)native_sectors);
1536 else if (native_sectors < sectors)
1537 ata_dev_printk(dev, KERN_WARNING,
1538 "native sectors (%llu) is smaller than "
1539 "sectors (%llu)\n",
1540 (unsigned long long)native_sectors,
1541 (unsigned long long)sectors);
1542 return 0;
1543 }
1544
1545 /* let's unlock HPA */
1546 rc = ata_set_max_sectors(dev, native_sectors);
1547 if (rc == -EACCES) {
1548 /* if device aborted the command, skip HPA resizing */
1549 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1550 "(%llu -> %llu), skipping HPA handling\n",
1551 (unsigned long long)sectors,
1552 (unsigned long long)native_sectors);
1553 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1554 return 0;
1555 } else if (rc)
1556 return rc;
1557
1558 /* re-read IDENTIFY data */
1559 rc = ata_dev_reread_id(dev, 0);
1560 if (rc) {
1561 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1562 "data after HPA resizing\n");
1563 return rc;
1564 }
1565
1566 if (print_info) {
1567 u64 new_sectors = ata_id_n_sectors(dev->id);
1568 ata_dev_printk(dev, KERN_INFO,
1569 "HPA unlocked: %llu -> %llu, native %llu\n",
1570 (unsigned long long)sectors,
1571 (unsigned long long)new_sectors,
1572 (unsigned long long)native_sectors);
1573 }
1574
1575 return 0;
1576 }
1577
1578 /**
1579 * ata_dump_id - IDENTIFY DEVICE info debugging output
1580 * @id: IDENTIFY DEVICE page to dump
1581 *
1582 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1583 * page.
1584 *
1585 * LOCKING:
1586 * caller.
1587 */
1588
1589 static inline void ata_dump_id(const u16 *id)
1590 {
1591 DPRINTK("49==0x%04x "
1592 "53==0x%04x "
1593 "63==0x%04x "
1594 "64==0x%04x "
1595 "75==0x%04x \n",
1596 id[49],
1597 id[53],
1598 id[63],
1599 id[64],
1600 id[75]);
1601 DPRINTK("80==0x%04x "
1602 "81==0x%04x "
1603 "82==0x%04x "
1604 "83==0x%04x "
1605 "84==0x%04x \n",
1606 id[80],
1607 id[81],
1608 id[82],
1609 id[83],
1610 id[84]);
1611 DPRINTK("88==0x%04x "
1612 "93==0x%04x\n",
1613 id[88],
1614 id[93]);
1615 }
1616
1617 /**
1618 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1619 * @id: IDENTIFY data to compute xfer mask from
1620 *
1621 * Compute the xfermask for this device. This is not as trivial
1622 * as it seems if we must consider early devices correctly.
1623 *
1624 * FIXME: pre IDE drive timing (do we care ?).
1625 *
1626 * LOCKING:
1627 * None.
1628 *
1629 * RETURNS:
1630 * Computed xfermask
1631 */
1632 unsigned long ata_id_xfermask(const u16 *id)
1633 {
1634 unsigned long pio_mask, mwdma_mask, udma_mask;
1635
1636 /* Usual case. Word 53 indicates word 64 is valid */
1637 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1638 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1639 pio_mask <<= 3;
1640 pio_mask |= 0x7;
1641 } else {
1642 /* If word 64 isn't valid then Word 51 high byte holds
1643 * the PIO timing number for the maximum. Turn it into
1644 * a mask.
1645 */
1646 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1647 if (mode < 5) /* Valid PIO range */
1648 pio_mask = (2 << mode) - 1;
1649 else
1650 pio_mask = 1;
1651
1652 /* But wait.. there's more. Design your standards by
1653 * committee and you too can get a free iordy field to
1654 * process. However its the speeds not the modes that
1655 * are supported... Note drivers using the timing API
1656 * will get this right anyway
1657 */
1658 }
1659
1660 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1661
1662 if (ata_id_is_cfa(id)) {
1663 /*
1664 * Process compact flash extended modes
1665 */
1666 int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1667 int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1668
1669 if (pio)
1670 pio_mask |= (1 << 5);
1671 if (pio > 1)
1672 pio_mask |= (1 << 6);
1673 if (dma)
1674 mwdma_mask |= (1 << 3);
1675 if (dma > 1)
1676 mwdma_mask |= (1 << 4);
1677 }
1678
1679 udma_mask = 0;
1680 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1681 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1682
1683 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1684 }
1685
1686 /**
1687 * ata_pio_queue_task - Queue port_task
1688 * @ap: The ata_port to queue port_task for
1689 * @data: data for @fn to use
1690 * @delay: delay time in msecs for workqueue function
1691 *
1692 * Schedule @fn(@data) for execution after @delay jiffies using
1693 * port_task. There is one port_task per port and it's the
1694 * user(low level driver)'s responsibility to make sure that only
1695 * one task is active at any given time.
1696 *
1697 * libata core layer takes care of synchronization between
1698 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1699 * synchronization.
1700 *
1701 * LOCKING:
1702 * Inherited from caller.
1703 */
1704 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1705 {
1706 ap->port_task_data = data;
1707
1708 /* may fail if ata_port_flush_task() in progress */
1709 queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
1710 }
1711
1712 /**
1713 * ata_port_flush_task - Flush port_task
1714 * @ap: The ata_port to flush port_task for
1715 *
1716 * After this function completes, port_task is guranteed not to
1717 * be running or scheduled.
1718 *
1719 * LOCKING:
1720 * Kernel thread context (may sleep)
1721 */
1722 void ata_port_flush_task(struct ata_port *ap)
1723 {
1724 DPRINTK("ENTER\n");
1725
1726 cancel_rearming_delayed_work(&ap->port_task);
1727
1728 if (ata_msg_ctl(ap))
1729 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1730 }
1731
1732 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1733 {
1734 struct completion *waiting = qc->private_data;
1735
1736 complete(waiting);
1737 }
1738
1739 /**
1740 * ata_exec_internal_sg - execute libata internal command
1741 * @dev: Device to which the command is sent
1742 * @tf: Taskfile registers for the command and the result
1743 * @cdb: CDB for packet command
1744 * @dma_dir: Data tranfer direction of the command
1745 * @sgl: sg list for the data buffer of the command
1746 * @n_elem: Number of sg entries
1747 * @timeout: Timeout in msecs (0 for default)
1748 *
1749 * Executes libata internal command with timeout. @tf contains
1750 * command on entry and result on return. Timeout and error
1751 * conditions are reported via return value. No recovery action
1752 * is taken after a command times out. It's caller's duty to
1753 * clean up after timeout.
1754 *
1755 * LOCKING:
1756 * None. Should be called with kernel context, might sleep.
1757 *
1758 * RETURNS:
1759 * Zero on success, AC_ERR_* mask on failure
1760 */
1761 unsigned ata_exec_internal_sg(struct ata_device *dev,
1762 struct ata_taskfile *tf, const u8 *cdb,
1763 int dma_dir, struct scatterlist *sgl,
1764 unsigned int n_elem, unsigned long timeout)
1765 {
1766 struct ata_link *link = dev->link;
1767 struct ata_port *ap = link->ap;
1768 u8 command = tf->command;
1769 int auto_timeout = 0;
1770 struct ata_queued_cmd *qc;
1771 unsigned int tag, preempted_tag;
1772 u32 preempted_sactive, preempted_qc_active;
1773 int preempted_nr_active_links;
1774 DECLARE_COMPLETION_ONSTACK(wait);
1775 unsigned long flags;
1776 unsigned int err_mask;
1777 int rc;
1778
1779 spin_lock_irqsave(ap->lock, flags);
1780
1781 /* no internal command while frozen */
1782 if (ap->pflags & ATA_PFLAG_FROZEN) {
1783 spin_unlock_irqrestore(ap->lock, flags);
1784 return AC_ERR_SYSTEM;
1785 }
1786
1787 /* initialize internal qc */
1788
1789 /* XXX: Tag 0 is used for drivers with legacy EH as some
1790 * drivers choke if any other tag is given. This breaks
1791 * ata_tag_internal() test for those drivers. Don't use new
1792 * EH stuff without converting to it.
1793 */
1794 if (ap->ops->error_handler)
1795 tag = ATA_TAG_INTERNAL;
1796 else
1797 tag = 0;
1798
1799 if (test_and_set_bit(tag, &ap->qc_allocated))
1800 BUG();
1801 qc = __ata_qc_from_tag(ap, tag);
1802
1803 qc->tag = tag;
1804 qc->scsicmd = NULL;
1805 qc->ap = ap;
1806 qc->dev = dev;
1807 ata_qc_reinit(qc);
1808
1809 preempted_tag = link->active_tag;
1810 preempted_sactive = link->sactive;
1811 preempted_qc_active = ap->qc_active;
1812 preempted_nr_active_links = ap->nr_active_links;
1813 link->active_tag = ATA_TAG_POISON;
1814 link->sactive = 0;
1815 ap->qc_active = 0;
1816 ap->nr_active_links = 0;
1817
1818 /* prepare & issue qc */
1819 qc->tf = *tf;
1820 if (cdb)
1821 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1822 qc->flags |= ATA_QCFLAG_RESULT_TF;
1823 qc->dma_dir = dma_dir;
1824 if (dma_dir != DMA_NONE) {
1825 unsigned int i, buflen = 0;
1826 struct scatterlist *sg;
1827
1828 for_each_sg(sgl, sg, n_elem, i)
1829 buflen += sg->length;
1830
1831 ata_sg_init(qc, sgl, n_elem);
1832 qc->nbytes = buflen;
1833 }
1834
1835 qc->private_data = &wait;
1836 qc->complete_fn = ata_qc_complete_internal;
1837
1838 ata_qc_issue(qc);
1839
1840 spin_unlock_irqrestore(ap->lock, flags);
1841
1842 if (!timeout) {
1843 if (ata_probe_timeout)
1844 timeout = ata_probe_timeout * 1000;
1845 else {
1846 timeout = ata_internal_cmd_timeout(dev, command);
1847 auto_timeout = 1;
1848 }
1849 }
1850
1851 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1852
1853 ata_port_flush_task(ap);
1854
1855 if (!rc) {
1856 spin_lock_irqsave(ap->lock, flags);
1857
1858 /* We're racing with irq here. If we lose, the
1859 * following test prevents us from completing the qc
1860 * twice. If we win, the port is frozen and will be
1861 * cleaned up by ->post_internal_cmd().
1862 */
1863 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1864 qc->err_mask |= AC_ERR_TIMEOUT;
1865
1866 if (ap->ops->error_handler)
1867 ata_port_freeze(ap);
1868 else
1869 ata_qc_complete(qc);
1870
1871 if (ata_msg_warn(ap))
1872 ata_dev_printk(dev, KERN_WARNING,
1873 "qc timeout (cmd 0x%x)\n", command);
1874 }
1875
1876 spin_unlock_irqrestore(ap->lock, flags);
1877 }
1878
1879 /* do post_internal_cmd */
1880 if (ap->ops->post_internal_cmd)
1881 ap->ops->post_internal_cmd(qc);
1882
1883 /* perform minimal error analysis */
1884 if (qc->flags & ATA_QCFLAG_FAILED) {
1885 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1886 qc->err_mask |= AC_ERR_DEV;
1887
1888 if (!qc->err_mask)
1889 qc->err_mask |= AC_ERR_OTHER;
1890
1891 if (qc->err_mask & ~AC_ERR_OTHER)
1892 qc->err_mask &= ~AC_ERR_OTHER;
1893 }
1894
1895 /* finish up */
1896 spin_lock_irqsave(ap->lock, flags);
1897
1898 *tf = qc->result_tf;
1899 err_mask = qc->err_mask;
1900
1901 ata_qc_free(qc);
1902 link->active_tag = preempted_tag;
1903 link->sactive = preempted_sactive;
1904 ap->qc_active = preempted_qc_active;
1905 ap->nr_active_links = preempted_nr_active_links;
1906
1907 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1908 * Until those drivers are fixed, we detect the condition
1909 * here, fail the command with AC_ERR_SYSTEM and reenable the
1910 * port.
1911 *
1912 * Note that this doesn't change any behavior as internal
1913 * command failure results in disabling the device in the
1914 * higher layer for LLDDs without new reset/EH callbacks.
1915 *
1916 * Kill the following code as soon as those drivers are fixed.
1917 */
1918 if (ap->flags & ATA_FLAG_DISABLED) {
1919 err_mask |= AC_ERR_SYSTEM;
1920 ata_port_probe(ap);
1921 }
1922
1923 spin_unlock_irqrestore(ap->lock, flags);
1924
1925 if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1926 ata_internal_cmd_timed_out(dev, command);
1927
1928 return err_mask;
1929 }
1930
1931 /**
1932 * ata_exec_internal - execute libata internal command
1933 * @dev: Device to which the command is sent
1934 * @tf: Taskfile registers for the command and the result
1935 * @cdb: CDB for packet command
1936 * @dma_dir: Data tranfer direction of the command
1937 * @buf: Data buffer of the command
1938 * @buflen: Length of data buffer
1939 * @timeout: Timeout in msecs (0 for default)
1940 *
1941 * Wrapper around ata_exec_internal_sg() which takes simple
1942 * buffer instead of sg list.
1943 *
1944 * LOCKING:
1945 * None. Should be called with kernel context, might sleep.
1946 *
1947 * RETURNS:
1948 * Zero on success, AC_ERR_* mask on failure
1949 */
1950 unsigned ata_exec_internal(struct ata_device *dev,
1951 struct ata_taskfile *tf, const u8 *cdb,
1952 int dma_dir, void *buf, unsigned int buflen,
1953 unsigned long timeout)
1954 {
1955 struct scatterlist *psg = NULL, sg;
1956 unsigned int n_elem = 0;
1957
1958 if (dma_dir != DMA_NONE) {
1959 WARN_ON(!buf);
1960 sg_init_one(&sg, buf, buflen);
1961 psg = &sg;
1962 n_elem++;
1963 }
1964
1965 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1966 timeout);
1967 }
1968
1969 /**
1970 * ata_do_simple_cmd - execute simple internal command
1971 * @dev: Device to which the command is sent
1972 * @cmd: Opcode to execute
1973 *
1974 * Execute a 'simple' command, that only consists of the opcode
1975 * 'cmd' itself, without filling any other registers
1976 *
1977 * LOCKING:
1978 * Kernel thread context (may sleep).
1979 *
1980 * RETURNS:
1981 * Zero on success, AC_ERR_* mask on failure
1982 */
1983 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1984 {
1985 struct ata_taskfile tf;
1986
1987 ata_tf_init(dev, &tf);
1988
1989 tf.command = cmd;
1990 tf.flags |= ATA_TFLAG_DEVICE;
1991 tf.protocol = ATA_PROT_NODATA;
1992
1993 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1994 }
1995
1996 /**
1997 * ata_pio_need_iordy - check if iordy needed
1998 * @adev: ATA device
1999 *
2000 * Check if the current speed of the device requires IORDY. Used
2001 * by various controllers for chip configuration.
2002 */
2003 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
2004 {
2005 /* Don't set IORDY if we're preparing for reset. IORDY may
2006 * lead to controller lock up on certain controllers if the
2007 * port is not occupied. See bko#11703 for details.
2008 */
2009 if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
2010 return 0;
2011 /* Controller doesn't support IORDY. Probably a pointless
2012 * check as the caller should know this.
2013 */
2014 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2015 return 0;
2016 /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6. */
2017 if (ata_id_is_cfa(adev->id)
2018 && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
2019 return 0;
2020 /* PIO3 and higher it is mandatory */
2021 if (adev->pio_mode > XFER_PIO_2)
2022 return 1;
2023 /* We turn it on when possible */
2024 if (ata_id_has_iordy(adev->id))
2025 return 1;
2026 return 0;
2027 }
2028
2029 /**
2030 * ata_pio_mask_no_iordy - Return the non IORDY mask
2031 * @adev: ATA device
2032 *
2033 * Compute the highest mode possible if we are not using iordy. Return
2034 * -1 if no iordy mode is available.
2035 */
2036 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
2037 {
2038 /* If we have no drive specific rule, then PIO 2 is non IORDY */
2039 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
2040 u16 pio = adev->id[ATA_ID_EIDE_PIO];
2041 /* Is the speed faster than the drive allows non IORDY ? */
2042 if (pio) {
2043 /* This is cycle times not frequency - watch the logic! */
2044 if (pio > 240) /* PIO2 is 240nS per cycle */
2045 return 3 << ATA_SHIFT_PIO;
2046 return 7 << ATA_SHIFT_PIO;
2047 }
2048 }
2049 return 3 << ATA_SHIFT_PIO;
2050 }
2051
2052 /**
2053 * ata_do_dev_read_id - default ID read method
2054 * @dev: device
2055 * @tf: proposed taskfile
2056 * @id: data buffer
2057 *
2058 * Issue the identify taskfile and hand back the buffer containing
2059 * identify data. For some RAID controllers and for pre ATA devices
2060 * this function is wrapped or replaced by the driver
2061 */
2062 unsigned int ata_do_dev_read_id(struct ata_device *dev,
2063 struct ata_taskfile *tf, u16 *id)
2064 {
2065 return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
2066 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
2067 }
2068
2069 /**
2070 * ata_dev_read_id - Read ID data from the specified device
2071 * @dev: target device
2072 * @p_class: pointer to class of the target device (may be changed)
2073 * @flags: ATA_READID_* flags
2074 * @id: buffer to read IDENTIFY data into
2075 *
2076 * Read ID data from the specified device. ATA_CMD_ID_ATA is
2077 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
2078 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
2079 * for pre-ATA4 drives.
2080 *
2081 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2082 * now we abort if we hit that case.
2083 *
2084 * LOCKING:
2085 * Kernel thread context (may sleep)
2086 *
2087 * RETURNS:
2088 * 0 on success, -errno otherwise.
2089 */
2090 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2091 unsigned int flags, u16 *id)
2092 {
2093 struct ata_port *ap = dev->link->ap;
2094 unsigned int class = *p_class;
2095 struct ata_taskfile tf;
2096 unsigned int err_mask = 0;
2097 const char *reason;
2098 bool is_semb = class == ATA_DEV_SEMB;
2099 int may_fallback = 1, tried_spinup = 0;
2100 int rc;
2101
2102 if (ata_msg_ctl(ap))
2103 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2104
2105 retry:
2106 ata_tf_init(dev, &tf);
2107
2108 switch (class) {
2109 case ATA_DEV_SEMB:
2110 class = ATA_DEV_ATA; /* some hard drives report SEMB sig */
2111 case ATA_DEV_ATA:
2112 tf.command = ATA_CMD_ID_ATA;
2113 break;
2114 case ATA_DEV_ATAPI:
2115 tf.command = ATA_CMD_ID_ATAPI;
2116 break;
2117 default:
2118 rc = -ENODEV;
2119 reason = "unsupported class";
2120 goto err_out;
2121 }
2122
2123 tf.protocol = ATA_PROT_PIO;
2124
2125 /* Some devices choke if TF registers contain garbage. Make
2126 * sure those are properly initialized.
2127 */
2128 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2129
2130 /* Device presence detection is unreliable on some
2131 * controllers. Always poll IDENTIFY if available.
2132 */
2133 tf.flags |= ATA_TFLAG_POLLING;
2134
2135 if (ap->ops->read_id)
2136 err_mask = ap->ops->read_id(dev, &tf, id);
2137 else
2138 err_mask = ata_do_dev_read_id(dev, &tf, id);
2139
2140 if (err_mask) {
2141 if (err_mask & AC_ERR_NODEV_HINT) {
2142 ata_dev_printk(dev, KERN_DEBUG,
2143 "NODEV after polling detection\n");
2144 return -ENOENT;
2145 }
2146
2147 if (is_semb) {
2148 ata_dev_printk(dev, KERN_INFO, "IDENTIFY failed on "
2149 "device w/ SEMB sig, disabled\n");
2150 /* SEMB is not supported yet */
2151 *p_class = ATA_DEV_SEMB_UNSUP;
2152 return 0;
2153 }
2154
2155 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
2156 /* Device or controller might have reported
2157 * the wrong device class. Give a shot at the
2158 * other IDENTIFY if the current one is
2159 * aborted by the device.
2160 */
2161 if (may_fallback) {
2162 may_fallback = 0;
2163
2164 if (class == ATA_DEV_ATA)
2165 class = ATA_DEV_ATAPI;
2166 else
2167 class = ATA_DEV_ATA;
2168 goto retry;
2169 }
2170
2171 /* Control reaches here iff the device aborted
2172 * both flavors of IDENTIFYs which happens
2173 * sometimes with phantom devices.
2174 */
2175 ata_dev_printk(dev, KERN_DEBUG,
2176 "both IDENTIFYs aborted, assuming NODEV\n");
2177 return -ENOENT;
2178 }
2179
2180 rc = -EIO;
2181 reason = "I/O error";
2182 goto err_out;
2183 }
2184
2185 /* Falling back doesn't make sense if ID data was read
2186 * successfully at least once.
2187 */
2188 may_fallback = 0;
2189
2190 swap_buf_le16(id, ATA_ID_WORDS);
2191
2192 /* sanity check */
2193 rc = -EINVAL;
2194 reason = "device reports invalid type";
2195
2196 if (class == ATA_DEV_ATA) {
2197 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
2198 goto err_out;
2199 } else {
2200 if (ata_id_is_ata(id))
2201 goto err_out;
2202 }
2203
2204 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2205 tried_spinup = 1;
2206 /*
2207 * Drive powered-up in standby mode, and requires a specific
2208 * SET_FEATURES spin-up subcommand before it will accept
2209 * anything other than the original IDENTIFY command.
2210 */
2211 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2212 if (err_mask && id[2] != 0x738c) {
2213 rc = -EIO;
2214 reason = "SPINUP failed";
2215 goto err_out;
2216 }
2217 /*
2218 * If the drive initially returned incomplete IDENTIFY info,
2219 * we now must reissue the IDENTIFY command.
2220 */
2221 if (id[2] == 0x37c8)
2222 goto retry;
2223 }
2224
2225 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2226 /*
2227 * The exact sequence expected by certain pre-ATA4 drives is:
2228 * SRST RESET
2229 * IDENTIFY (optional in early ATA)
2230 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2231 * anything else..
2232 * Some drives were very specific about that exact sequence.
2233 *
2234 * Note that ATA4 says lba is mandatory so the second check
2235 * shoud never trigger.
2236 */
2237 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2238 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2239 if (err_mask) {
2240 rc = -EIO;
2241 reason = "INIT_DEV_PARAMS failed";
2242 goto err_out;
2243 }
2244
2245 /* current CHS translation info (id[53-58]) might be
2246 * changed. reread the identify device info.
2247 */
2248 flags &= ~ATA_READID_POSTRESET;
2249 goto retry;
2250 }
2251 }
2252
2253 *p_class = class;
2254
2255 return 0;
2256
2257 err_out:
2258 if (ata_msg_warn(ap))
2259 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2260 "(%s, err_mask=0x%x)\n", reason, err_mask);
2261 return rc;
2262 }
2263
2264 static int ata_do_link_spd_horkage(struct ata_device *dev)
2265 {
2266 struct ata_link *plink = ata_dev_phys_link(dev);
2267 u32 target, target_limit;
2268
2269 if (!sata_scr_valid(plink))
2270 return 0;
2271
2272 if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2273 target = 1;
2274 else
2275 return 0;
2276
2277 target_limit = (1 << target) - 1;
2278
2279 /* if already on stricter limit, no need to push further */
2280 if (plink->sata_spd_limit <= target_limit)
2281 return 0;
2282
2283 plink->sata_spd_limit = target_limit;
2284
2285 /* Request another EH round by returning -EAGAIN if link is
2286 * going faster than the target speed. Forward progress is
2287 * guaranteed by setting sata_spd_limit to target_limit above.
2288 */
2289 if (plink->sata_spd > target) {
2290 ata_dev_printk(dev, KERN_INFO,
2291 "applying link speed limit horkage to %s\n",
2292 sata_spd_string(target));
2293 return -EAGAIN;
2294 }
2295 return 0;
2296 }
2297
2298 static inline u8 ata_dev_knobble(struct ata_device *dev)
2299 {
2300 struct ata_port *ap = dev->link->ap;
2301
2302 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2303 return 0;
2304
2305 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2306 }
2307
2308 static void ata_dev_config_ncq(struct ata_device *dev,
2309 char *desc, size_t desc_sz)
2310 {
2311 struct ata_port *ap = dev->link->ap;
2312 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2313
2314 if (!ata_id_has_ncq(dev->id)) {
2315 desc[0] = '\0';
2316 return;
2317 }
2318 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2319 snprintf(desc, desc_sz, "NCQ (not used)");
2320 return;
2321 }
2322 if (ap->flags & ATA_FLAG_NCQ) {
2323 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2324 dev->flags |= ATA_DFLAG_NCQ;
2325 }
2326
2327 if (hdepth >= ddepth)
2328 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2329 else
2330 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2331 }
2332
2333 /**
2334 * ata_dev_configure - Configure the specified ATA/ATAPI device
2335 * @dev: Target device to configure
2336 *
2337 * Configure @dev according to @dev->id. Generic and low-level
2338 * driver specific fixups are also applied.
2339 *
2340 * LOCKING:
2341 * Kernel thread context (may sleep)
2342 *
2343 * RETURNS:
2344 * 0 on success, -errno otherwise
2345 */
2346 int ata_dev_configure(struct ata_device *dev)
2347 {
2348 struct ata_port *ap = dev->link->ap;
2349 struct ata_eh_context *ehc = &dev->link->eh_context;
2350 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2351 const u16 *id = dev->id;
2352 unsigned long xfer_mask;
2353 char revbuf[7]; /* XYZ-99\0 */
2354 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2355 char modelbuf[ATA_ID_PROD_LEN+1];
2356 int rc;
2357
2358 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2359 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2360 __func__);
2361 return 0;
2362 }
2363
2364 if (ata_msg_probe(ap))
2365 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2366
2367 /* set horkage */
2368 dev->horkage |= ata_dev_blacklisted(dev);
2369 ata_force_horkage(dev);
2370
2371 if (dev->horkage & ATA_HORKAGE_DISABLE) {
2372 ata_dev_printk(dev, KERN_INFO,
2373 "unsupported device, disabling\n");
2374 ata_dev_disable(dev);
2375 return 0;
2376 }
2377
2378 if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2379 dev->class == ATA_DEV_ATAPI) {
2380 ata_dev_printk(dev, KERN_WARNING,
2381 "WARNING: ATAPI is %s, device ignored.\n",
2382 atapi_enabled ? "not supported with this driver"
2383 : "disabled");
2384 ata_dev_disable(dev);
2385 return 0;
2386 }
2387
2388 rc = ata_do_link_spd_horkage(dev);
2389 if (rc)
2390 return rc;
2391
2392 /* let ACPI work its magic */
2393 rc = ata_acpi_on_devcfg(dev);
2394 if (rc)
2395 return rc;
2396
2397 /* massage HPA, do it early as it might change IDENTIFY data */
2398 rc = ata_hpa_resize(dev);
2399 if (rc)
2400 return rc;
2401
2402 /* print device capabilities */
2403 if (ata_msg_probe(ap))
2404 ata_dev_printk(dev, KERN_DEBUG,
2405 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2406 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2407 __func__,
2408 id[49], id[82], id[83], id[84],
2409 id[85], id[86], id[87], id[88]);
2410
2411 /* initialize to-be-configured parameters */
2412 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2413 dev->max_sectors = 0;
2414 dev->cdb_len = 0;
2415 dev->n_sectors = 0;
2416 dev->cylinders = 0;
2417 dev->heads = 0;
2418 dev->sectors = 0;
2419 dev->multi_count = 0;
2420
2421 /*
2422 * common ATA, ATAPI feature tests
2423 */
2424
2425 /* find max transfer mode; for printk only */
2426 xfer_mask = ata_id_xfermask(id);
2427
2428 if (ata_msg_probe(ap))
2429 ata_dump_id(id);
2430
2431 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2432 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2433 sizeof(fwrevbuf));
2434
2435 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2436 sizeof(modelbuf));
2437
2438 /* ATA-specific feature tests */
2439 if (dev->class == ATA_DEV_ATA) {
2440 if (ata_id_is_cfa(id)) {
2441 /* CPRM may make this media unusable */
2442 if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2443 ata_dev_printk(dev, KERN_WARNING,
2444 "supports DRM functions and may "
2445 "not be fully accessable.\n");
2446 snprintf(revbuf, 7, "CFA");
2447 } else {
2448 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2449 /* Warn the user if the device has TPM extensions */
2450 if (ata_id_has_tpm(id))
2451 ata_dev_printk(dev, KERN_WARNING,
2452 "supports DRM functions and may "
2453 "not be fully accessable.\n");
2454 }
2455
2456 dev->n_sectors = ata_id_n_sectors(id);
2457
2458 /* get current R/W Multiple count setting */
2459 if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2460 unsigned int max = dev->id[47] & 0xff;
2461 unsigned int cnt = dev->id[59] & 0xff;
2462 /* only recognize/allow powers of two here */
2463 if (is_power_of_2(max) && is_power_of_2(cnt))
2464 if (cnt <= max)
2465 dev->multi_count = cnt;
2466 }
2467
2468 if (ata_id_has_lba(id)) {
2469 const char *lba_desc;
2470 char ncq_desc[20];
2471
2472 lba_desc = "LBA";
2473 dev->flags |= ATA_DFLAG_LBA;
2474 if (ata_id_has_lba48(id)) {
2475 dev->flags |= ATA_DFLAG_LBA48;
2476 lba_desc = "LBA48";
2477
2478 if (dev->n_sectors >= (1UL << 28) &&
2479 ata_id_has_flush_ext(id))
2480 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2481 }
2482
2483 /* config NCQ */
2484 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2485
2486 /* print device info to dmesg */
2487 if (ata_msg_drv(ap) && print_info) {
2488 ata_dev_printk(dev, KERN_INFO,
2489 "%s: %s, %s, max %s\n",
2490 revbuf, modelbuf, fwrevbuf,
2491 ata_mode_string(xfer_mask));
2492 ata_dev_printk(dev, KERN_INFO,
2493 "%Lu sectors, multi %u: %s %s\n",
2494 (unsigned long long)dev->n_sectors,
2495 dev->multi_count, lba_desc, ncq_desc);
2496 }
2497 } else {
2498 /* CHS */
2499
2500 /* Default translation */
2501 dev->cylinders = id[1];
2502 dev->heads = id[3];
2503 dev->sectors = id[6];
2504
2505 if (ata_id_current_chs_valid(id)) {
2506 /* Current CHS translation is valid. */
2507 dev->cylinders = id[54];
2508 dev->heads = id[55];
2509 dev->sectors = id[56];
2510 }
2511
2512 /* print device info to dmesg */
2513 if (ata_msg_drv(ap) && print_info) {
2514 ata_dev_printk(dev, KERN_INFO,
2515 "%s: %s, %s, max %s\n",
2516 revbuf, modelbuf, fwrevbuf,
2517 ata_mode_string(xfer_mask));
2518 ata_dev_printk(dev, KERN_INFO,
2519 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2520 (unsigned long long)dev->n_sectors,
2521 dev->multi_count, dev->cylinders,
2522 dev->heads, dev->sectors);
2523 }
2524 }
2525
2526 dev->cdb_len = 16;
2527 }
2528
2529 /* ATAPI-specific feature tests */
2530 else if (dev->class == ATA_DEV_ATAPI) {
2531 const char *cdb_intr_string = "";
2532 const char *atapi_an_string = "";
2533 const char *dma_dir_string = "";
2534 u32 sntf;
2535
2536 rc = atapi_cdb_len(id);
2537 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2538 if (ata_msg_warn(ap))
2539 ata_dev_printk(dev, KERN_WARNING,
2540 "unsupported CDB len\n");
2541 rc = -EINVAL;
2542 goto err_out_nosup;
2543 }
2544 dev->cdb_len = (unsigned int) rc;
2545
2546 /* Enable ATAPI AN if both the host and device have
2547 * the support. If PMP is attached, SNTF is required
2548 * to enable ATAPI AN to discern between PHY status
2549 * changed notifications and ATAPI ANs.
2550 */
2551 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2552 (!sata_pmp_attached(ap) ||
2553 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2554 unsigned int err_mask;
2555
2556 /* issue SET feature command to turn this on */
2557 err_mask = ata_dev_set_feature(dev,
2558 SETFEATURES_SATA_ENABLE, SATA_AN);
2559 if (err_mask)
2560 ata_dev_printk(dev, KERN_ERR,
2561 "failed to enable ATAPI AN "
2562 "(err_mask=0x%x)\n", err_mask);
2563 else {
2564 dev->flags |= ATA_DFLAG_AN;
2565 atapi_an_string = ", ATAPI AN";
2566 }
2567 }
2568
2569 if (ata_id_cdb_intr(dev->id)) {
2570 dev->flags |= ATA_DFLAG_CDB_INTR;
2571 cdb_intr_string = ", CDB intr";
2572 }
2573
2574 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2575 dev->flags |= ATA_DFLAG_DMADIR;
2576 dma_dir_string = ", DMADIR";
2577 }
2578
2579 /* print device info to dmesg */
2580 if (ata_msg_drv(ap) && print_info)
2581 ata_dev_printk(dev, KERN_INFO,
2582 "ATAPI: %s, %s, max %s%s%s%s\n",
2583 modelbuf, fwrevbuf,
2584 ata_mode_string(xfer_mask),
2585 cdb_intr_string, atapi_an_string,
2586 dma_dir_string);
2587 }
2588
2589 /* determine max_sectors */
2590 dev->max_sectors = ATA_MAX_SECTORS;
2591 if (dev->flags & ATA_DFLAG_LBA48)
2592 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2593
2594 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2595 if (ata_id_has_hipm(dev->id))
2596 dev->flags |= ATA_DFLAG_HIPM;
2597 if (ata_id_has_dipm(dev->id))
2598 dev->flags |= ATA_DFLAG_DIPM;
2599 }
2600
2601 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2602 200 sectors */
2603 if (ata_dev_knobble(dev)) {
2604 if (ata_msg_drv(ap) && print_info)
2605 ata_dev_printk(dev, KERN_INFO,
2606 "applying bridge limits\n");
2607 dev->udma_mask &= ATA_UDMA5;
2608 dev->max_sectors = ATA_MAX_SECTORS;
2609 }
2610
2611 if ((dev->class == ATA_DEV_ATAPI) &&
2612 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2613 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2614 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2615 }
2616
2617 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2618 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2619 dev->max_sectors);
2620
2621 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2622 dev->horkage |= ATA_HORKAGE_IPM;
2623
2624 /* reset link pm_policy for this port to no pm */
2625 ap->pm_policy = MAX_PERFORMANCE;
2626 }
2627
2628 if (ap->ops->dev_config)
2629 ap->ops->dev_config(dev);
2630
2631 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2632 /* Let the user know. We don't want to disallow opens for
2633 rescue purposes, or in case the vendor is just a blithering
2634 idiot. Do this after the dev_config call as some controllers
2635 with buggy firmware may want to avoid reporting false device
2636 bugs */
2637
2638 if (print_info) {
2639 ata_dev_printk(dev, KERN_WARNING,
2640 "Drive reports diagnostics failure. This may indicate a drive\n");
2641 ata_dev_printk(dev, KERN_WARNING,
2642 "fault or invalid emulation. Contact drive vendor for information.\n");
2643 }
2644 }
2645
2646 if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2647 ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires "
2648 "firmware update to be fully functional.\n");
2649 ata_dev_printk(dev, KERN_WARNING, " contact the vendor "
2650 "or visit http://ata.wiki.kernel.org.\n");
2651 }
2652
2653 return 0;
2654
2655 err_out_nosup:
2656 if (ata_msg_probe(ap))
2657 ata_dev_printk(dev, KERN_DEBUG,
2658 "%s: EXIT, err\n", __func__);
2659 return rc;
2660 }
2661
2662 /**
2663 * ata_cable_40wire - return 40 wire cable type
2664 * @ap: port
2665 *
2666 * Helper method for drivers which want to hardwire 40 wire cable
2667 * detection.
2668 */
2669
2670 int ata_cable_40wire(struct ata_port *ap)
2671 {
2672 return ATA_CBL_PATA40;
2673 }
2674
2675 /**
2676 * ata_cable_80wire - return 80 wire cable type
2677 * @ap: port
2678 *
2679 * Helper method for drivers which want to hardwire 80 wire cable
2680 * detection.
2681 */
2682
2683 int ata_cable_80wire(struct ata_port *ap)
2684 {
2685 return ATA_CBL_PATA80;
2686 }
2687
2688 /**
2689 * ata_cable_unknown - return unknown PATA cable.
2690 * @ap: port
2691 *
2692 * Helper method for drivers which have no PATA cable detection.
2693 */
2694
2695 int ata_cable_unknown(struct ata_port *ap)
2696 {
2697 return ATA_CBL_PATA_UNK;
2698 }
2699
2700 /**
2701 * ata_cable_ignore - return ignored PATA cable.
2702 * @ap: port
2703 *
2704 * Helper method for drivers which don't use cable type to limit
2705 * transfer mode.
2706 */
2707 int ata_cable_ignore(struct ata_port *ap)
2708 {
2709 return ATA_CBL_PATA_IGN;
2710 }
2711
2712 /**
2713 * ata_cable_sata - return SATA cable type
2714 * @ap: port
2715 *
2716 * Helper method for drivers which have SATA cables
2717 */
2718
2719 int ata_cable_sata(struct ata_port *ap)
2720 {
2721 return ATA_CBL_SATA;
2722 }
2723
2724 /**
2725 * ata_bus_probe - Reset and probe ATA bus
2726 * @ap: Bus to probe
2727 *
2728 * Master ATA bus probing function. Initiates a hardware-dependent
2729 * bus reset, then attempts to identify any devices found on
2730 * the bus.
2731 *
2732 * LOCKING:
2733 * PCI/etc. bus probe sem.
2734 *
2735 * RETURNS:
2736 * Zero on success, negative errno otherwise.
2737 */
2738
2739 int ata_bus_probe(struct ata_port *ap)
2740 {
2741 unsigned int classes[ATA_MAX_DEVICES];
2742 int tries[ATA_MAX_DEVICES];
2743 int rc;
2744 struct ata_device *dev;
2745
2746 ata_port_probe(ap);
2747
2748 ata_for_each_dev(dev, &ap->link, ALL)
2749 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2750
2751 retry:
2752 ata_for_each_dev(dev, &ap->link, ALL) {
2753 /* If we issue an SRST then an ATA drive (not ATAPI)
2754 * may change configuration and be in PIO0 timing. If
2755 * we do a hard reset (or are coming from power on)
2756 * this is true for ATA or ATAPI. Until we've set a
2757 * suitable controller mode we should not touch the
2758 * bus as we may be talking too fast.
2759 */
2760 dev->pio_mode = XFER_PIO_0;
2761
2762 /* If the controller has a pio mode setup function
2763 * then use it to set the chipset to rights. Don't
2764 * touch the DMA setup as that will be dealt with when
2765 * configuring devices.
2766 */
2767 if (ap->ops->set_piomode)
2768 ap->ops->set_piomode(ap, dev);
2769 }
2770
2771 /* reset and determine device classes */
2772 ap->ops->phy_reset(ap);
2773
2774 ata_for_each_dev(dev, &ap->link, ALL) {
2775 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2776 dev->class != ATA_DEV_UNKNOWN)
2777 classes[dev->devno] = dev->class;
2778 else
2779 classes[dev->devno] = ATA_DEV_NONE;
2780
2781 dev->class = ATA_DEV_UNKNOWN;
2782 }
2783
2784 ata_port_probe(ap);
2785
2786 /* read IDENTIFY page and configure devices. We have to do the identify
2787 specific sequence bass-ackwards so that PDIAG- is released by
2788 the slave device */
2789
2790 ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2791 if (tries[dev->devno])
2792 dev->class = classes[dev->devno];
2793
2794 if (!ata_dev_enabled(dev))
2795 continue;
2796
2797 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2798 dev->id);
2799 if (rc)
2800 goto fail;
2801 }
2802
2803 /* Now ask for the cable type as PDIAG- should have been released */
2804 if (ap->ops->cable_detect)
2805 ap->cbl = ap->ops->cable_detect(ap);
2806
2807 /* We may have SATA bridge glue hiding here irrespective of
2808 * the reported cable types and sensed types. When SATA
2809 * drives indicate we have a bridge, we don't know which end
2810 * of the link the bridge is which is a problem.
2811 */
2812 ata_for_each_dev(dev, &ap->link, ENABLED)
2813 if (ata_id_is_sata(dev->id))
2814 ap->cbl = ATA_CBL_SATA;
2815
2816 /* After the identify sequence we can now set up the devices. We do
2817 this in the normal order so that the user doesn't get confused */
2818
2819 ata_for_each_dev(dev, &ap->link, ENABLED) {
2820 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2821 rc = ata_dev_configure(dev);
2822 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2823 if (rc)
2824 goto fail;
2825 }
2826
2827 /* configure transfer mode */
2828 rc = ata_set_mode(&ap->link, &dev);
2829 if (rc)
2830 goto fail;
2831
2832 ata_for_each_dev(dev, &ap->link, ENABLED)
2833 return 0;
2834
2835 /* no device present, disable port */
2836 ata_port_disable(ap);
2837 return -ENODEV;
2838
2839 fail:
2840 tries[dev->devno]--;
2841
2842 switch (rc) {
2843 case -EINVAL:
2844 /* eeek, something went very wrong, give up */
2845 tries[dev->devno] = 0;
2846 break;
2847
2848 case -ENODEV:
2849 /* give it just one more chance */
2850 tries[dev->devno] = min(tries[dev->devno], 1);
2851 case -EIO:
2852 if (tries[dev->devno] == 1) {
2853 /* This is the last chance, better to slow
2854 * down than lose it.
2855 */
2856 sata_down_spd_limit(&ap->link, 0);
2857 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2858 }
2859 }
2860
2861 if (!tries[dev->devno])
2862 ata_dev_disable(dev);
2863
2864 goto retry;
2865 }
2866
2867 /**
2868 * ata_port_probe - Mark port as enabled
2869 * @ap: Port for which we indicate enablement
2870 *
2871 * Modify @ap data structure such that the system
2872 * thinks that the entire port is enabled.
2873 *
2874 * LOCKING: host lock, or some other form of
2875 * serialization.
2876 */
2877
2878 void ata_port_probe(struct ata_port *ap)
2879 {
2880 ap->flags &= ~ATA_FLAG_DISABLED;
2881 }
2882
2883 /**
2884 * sata_print_link_status - Print SATA link status
2885 * @link: SATA link to printk link status about
2886 *
2887 * This function prints link speed and status of a SATA link.
2888 *
2889 * LOCKING:
2890 * None.
2891 */
2892 static void sata_print_link_status(struct ata_link *link)
2893 {
2894 u32 sstatus, scontrol, tmp;
2895
2896 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2897 return;
2898 sata_scr_read(link, SCR_CONTROL, &scontrol);
2899
2900 if (ata_phys_link_online(link)) {
2901 tmp = (sstatus >> 4) & 0xf;
2902 ata_link_printk(link, KERN_INFO,
2903 "SATA link up %s (SStatus %X SControl %X)\n",
2904 sata_spd_string(tmp), sstatus, scontrol);
2905 } else {
2906 ata_link_printk(link, KERN_INFO,
2907 "SATA link down (SStatus %X SControl %X)\n",
2908 sstatus, scontrol);
2909 }
2910 }
2911
2912 /**
2913 * ata_dev_pair - return other device on cable
2914 * @adev: device
2915 *
2916 * Obtain the other device on the same cable, or if none is
2917 * present NULL is returned
2918 */
2919
2920 struct ata_device *ata_dev_pair(struct ata_device *adev)
2921 {
2922 struct ata_link *link = adev->link;
2923 struct ata_device *pair = &link->device[1 - adev->devno];
2924 if (!ata_dev_enabled(pair))
2925 return NULL;
2926 return pair;
2927 }
2928
2929 /**
2930 * ata_port_disable - Disable port.
2931 * @ap: Port to be disabled.
2932 *
2933 * Modify @ap data structure such that the system
2934 * thinks that the entire port is disabled, and should
2935 * never attempt to probe or communicate with devices
2936 * on this port.
2937 *
2938 * LOCKING: host lock, or some other form of
2939 * serialization.
2940 */
2941
2942 void ata_port_disable(struct ata_port *ap)
2943 {
2944 ap->link.device[0].class = ATA_DEV_NONE;
2945 ap->link.device[1].class = ATA_DEV_NONE;
2946 ap->flags |= ATA_FLAG_DISABLED;
2947 }
2948
2949 /**
2950 * sata_down_spd_limit - adjust SATA spd limit downward
2951 * @link: Link to adjust SATA spd limit for
2952 * @spd_limit: Additional limit
2953 *
2954 * Adjust SATA spd limit of @link downward. Note that this
2955 * function only adjusts the limit. The change must be applied
2956 * using sata_set_spd().
2957 *
2958 * If @spd_limit is non-zero, the speed is limited to equal to or
2959 * lower than @spd_limit if such speed is supported. If
2960 * @spd_limit is slower than any supported speed, only the lowest
2961 * supported speed is allowed.
2962 *
2963 * LOCKING:
2964 * Inherited from caller.
2965 *
2966 * RETURNS:
2967 * 0 on success, negative errno on failure
2968 */
2969 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2970 {
2971 u32 sstatus, spd, mask;
2972 int rc, bit;
2973
2974 if (!sata_scr_valid(link))
2975 return -EOPNOTSUPP;
2976
2977 /* If SCR can be read, use it to determine the current SPD.
2978 * If not, use cached value in link->sata_spd.
2979 */
2980 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2981 if (rc == 0 && ata_sstatus_online(sstatus))
2982 spd = (sstatus >> 4) & 0xf;
2983 else
2984 spd = link->sata_spd;
2985
2986 mask = link->sata_spd_limit;
2987 if (mask <= 1)
2988 return -EINVAL;
2989
2990 /* unconditionally mask off the highest bit */
2991 bit = fls(mask) - 1;
2992 mask &= ~(1 << bit);
2993
2994 /* Mask off all speeds higher than or equal to the current
2995 * one. Force 1.5Gbps if current SPD is not available.
2996 */
2997 if (spd > 1)
2998 mask &= (1 << (spd - 1)) - 1;
2999 else
3000 mask &= 1;
3001
3002 /* were we already at the bottom? */
3003 if (!mask)
3004 return -EINVAL;
3005
3006 if (spd_limit) {
3007 if (mask & ((1 << spd_limit) - 1))
3008 mask &= (1 << spd_limit) - 1;
3009 else {
3010 bit = ffs(mask) - 1;
3011 mask = 1 << bit;
3012 }
3013 }
3014
3015 link->sata_spd_limit = mask;
3016
3017 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
3018 sata_spd_string(fls(mask)));
3019
3020 return 0;
3021 }
3022
3023 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3024 {
3025 struct ata_link *host_link = &link->ap->link;
3026 u32 limit, target, spd;
3027
3028 limit = link->sata_spd_limit;
3029
3030 /* Don't configure downstream link faster than upstream link.
3031 * It doesn't speed up anything and some PMPs choke on such
3032 * configuration.
3033 */
3034 if (!ata_is_host_link(link) && host_link->sata_spd)
3035 limit &= (1 << host_link->sata_spd) - 1;
3036
3037 if (limit == UINT_MAX)
3038 target = 0;
3039 else
3040 target = fls(limit);
3041
3042 spd = (*scontrol >> 4) & 0xf;
3043 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3044
3045 return spd != target;
3046 }
3047
3048 /**
3049 * sata_set_spd_needed - is SATA spd configuration needed
3050 * @link: Link in question
3051 *
3052 * Test whether the spd limit in SControl matches
3053 * @link->sata_spd_limit. This function is used to determine
3054 * whether hardreset is necessary to apply SATA spd
3055 * configuration.
3056 *
3057 * LOCKING:
3058 * Inherited from caller.
3059 *
3060 * RETURNS:
3061 * 1 if SATA spd configuration is needed, 0 otherwise.
3062 */
3063 static int sata_set_spd_needed(struct ata_link *link)
3064 {
3065 u32 scontrol;
3066
3067 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3068 return 1;
3069
3070 return __sata_set_spd_needed(link, &scontrol);
3071 }
3072
3073 /**
3074 * sata_set_spd - set SATA spd according to spd limit
3075 * @link: Link to set SATA spd for
3076 *
3077 * Set SATA spd of @link according to sata_spd_limit.
3078 *
3079 * LOCKING:
3080 * Inherited from caller.
3081 *
3082 * RETURNS:
3083 * 0 if spd doesn't need to be changed, 1 if spd has been
3084 * changed. Negative errno if SCR registers are inaccessible.
3085 */
3086 int sata_set_spd(struct ata_link *link)
3087 {
3088 u32 scontrol;
3089 int rc;
3090
3091 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3092 return rc;
3093
3094 if (!__sata_set_spd_needed(link, &scontrol))
3095 return 0;
3096
3097 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3098 return rc;
3099
3100 return 1;
3101 }
3102
3103 /*
3104 * This mode timing computation functionality is ported over from
3105 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
3106 */
3107 /*
3108 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
3109 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3110 * for UDMA6, which is currently supported only by Maxtor drives.
3111 *
3112 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
3113 */
3114
3115 static const struct ata_timing ata_timing[] = {
3116 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0, 960, 0 }, */
3117 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 0, 600, 0 },
3118 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 0, 383, 0 },
3119 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 0, 240, 0 },
3120 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 0, 180, 0 },
3121 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 0, 120, 0 },
3122 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 0, 100, 0 },
3123 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 0, 80, 0 },
3124
3125 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 50, 960, 0 },
3126 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 30, 480, 0 },
3127 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 20, 240, 0 },
3128
3129 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 20, 480, 0 },
3130 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 5, 150, 0 },
3131 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 5, 120, 0 },
3132 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 5, 100, 0 },
3133 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 5, 80, 0 },
3134
3135 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 0, 150 }, */
3136 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 0, 120 },
3137 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 0, 80 },
3138 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 0, 60 },
3139 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 0, 45 },
3140 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 0, 30 },
3141 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 0, 20 },
3142 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 0, 15 },
3143
3144 { 0xFF }
3145 };
3146
3147 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
3148 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
3149
3150 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
3151 {
3152 q->setup = EZ(t->setup * 1000, T);
3153 q->act8b = EZ(t->act8b * 1000, T);
3154 q->rec8b = EZ(t->rec8b * 1000, T);
3155 q->cyc8b = EZ(t->cyc8b * 1000, T);
3156 q->active = EZ(t->active * 1000, T);
3157 q->recover = EZ(t->recover * 1000, T);
3158 q->dmack_hold = EZ(t->dmack_hold * 1000, T);
3159 q->cycle = EZ(t->cycle * 1000, T);
3160 q->udma = EZ(t->udma * 1000, UT);
3161 }
3162
3163 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
3164 struct ata_timing *m, unsigned int what)
3165 {
3166 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
3167 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
3168 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
3169 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
3170 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
3171 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
3172 if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
3173 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
3174 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
3175 }
3176
3177 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
3178 {
3179 const struct ata_timing *t = ata_timing;
3180
3181 while (xfer_mode > t->mode)
3182 t++;
3183
3184 if (xfer_mode == t->mode)
3185 return t;
3186 return NULL;
3187 }
3188
3189 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
3190 struct ata_timing *t, int T, int UT)
3191 {
3192 const struct ata_timing *s;
3193 struct ata_timing p;
3194
3195 /*
3196 * Find the mode.
3197 */
3198
3199 if (!(s = ata_timing_find_mode(speed)))
3200 return -EINVAL;
3201
3202 memcpy(t, s, sizeof(*s));
3203
3204 /*
3205 * If the drive is an EIDE drive, it can tell us it needs extended
3206 * PIO/MW_DMA cycle timing.
3207 */
3208
3209 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
3210 memset(&p, 0, sizeof(p));
3211 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
3212 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
3213 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
3214 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
3215 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
3216 }
3217 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
3218 }
3219
3220 /*
3221 * Convert the timing to bus clock counts.
3222 */
3223
3224 ata_timing_quantize(t, t, T, UT);
3225
3226 /*
3227 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
3228 * S.M.A.R.T * and some other commands. We have to ensure that the
3229 * DMA cycle timing is slower/equal than the fastest PIO timing.
3230 */
3231
3232 if (speed > XFER_PIO_6) {
3233 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
3234 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
3235 }
3236
3237 /*
3238 * Lengthen active & recovery time so that cycle time is correct.
3239 */
3240
3241 if (t->act8b + t->rec8b < t->cyc8b) {
3242 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
3243 t->rec8b = t->cyc8b - t->act8b;
3244 }
3245
3246 if (t->active + t->recover < t->cycle) {
3247 t->active += (t->cycle - (t->active + t->recover)) / 2;
3248 t->recover = t->cycle - t->active;
3249 }
3250
3251 /* In a few cases quantisation may produce enough errors to
3252 leave t->cycle too low for the sum of active and recovery
3253 if so we must correct this */
3254 if (t->active + t->recover > t->cycle)
3255 t->cycle = t->active + t->recover;
3256
3257 return 0;
3258 }
3259
3260 /**
3261 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3262 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3263 * @cycle: cycle duration in ns
3264 *
3265 * Return matching xfer mode for @cycle. The returned mode is of
3266 * the transfer type specified by @xfer_shift. If @cycle is too
3267 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
3268 * than the fastest known mode, the fasted mode is returned.
3269 *
3270 * LOCKING:
3271 * None.
3272 *
3273 * RETURNS:
3274 * Matching xfer_mode, 0xff if no match found.
3275 */
3276 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3277 {
3278 u8 base_mode = 0xff, last_mode = 0xff;
3279 const struct ata_xfer_ent *ent;
3280 const struct ata_timing *t;
3281
3282 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3283 if (ent->shift == xfer_shift)
3284 base_mode = ent->base;
3285
3286 for (t = ata_timing_find_mode(base_mode);
3287 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3288 unsigned short this_cycle;
3289
3290 switch (xfer_shift) {
3291 case ATA_SHIFT_PIO:
3292 case ATA_SHIFT_MWDMA:
3293 this_cycle = t->cycle;
3294 break;
3295 case ATA_SHIFT_UDMA:
3296 this_cycle = t->udma;
3297 break;
3298 default:
3299 return 0xff;
3300 }
3301
3302 if (cycle > this_cycle)
3303 break;
3304
3305 last_mode = t->mode;
3306 }
3307
3308 return last_mode;
3309 }
3310
3311 /**
3312 * ata_down_xfermask_limit - adjust dev xfer masks downward
3313 * @dev: Device to adjust xfer masks
3314 * @sel: ATA_DNXFER_* selector
3315 *
3316 * Adjust xfer masks of @dev downward. Note that this function
3317 * does not apply the change. Invoking ata_set_mode() afterwards
3318 * will apply the limit.
3319 *
3320 * LOCKING:
3321 * Inherited from caller.
3322 *
3323 * RETURNS:
3324 * 0 on success, negative errno on failure
3325 */
3326 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3327 {
3328 char buf[32];
3329 unsigned long orig_mask, xfer_mask;
3330 unsigned long pio_mask, mwdma_mask, udma_mask;
3331 int quiet, highbit;
3332
3333 quiet = !!(sel & ATA_DNXFER_QUIET);
3334 sel &= ~ATA_DNXFER_QUIET;
3335
3336 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3337 dev->mwdma_mask,
3338 dev->udma_mask);
3339 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3340
3341 switch (sel) {
3342 case ATA_DNXFER_PIO:
3343 highbit = fls(pio_mask) - 1;
3344 pio_mask &= ~(1 << highbit);
3345 break;
3346
3347 case ATA_DNXFER_DMA:
3348 if (udma_mask) {
3349 highbit = fls(udma_mask) - 1;
3350 udma_mask &= ~(1 << highbit);
3351 if (!udma_mask)
3352 return -ENOENT;
3353 } else if (mwdma_mask) {
3354 highbit = fls(mwdma_mask) - 1;
3355 mwdma_mask &= ~(1 << highbit);
3356 if (!mwdma_mask)
3357 return -ENOENT;
3358 }
3359 break;
3360
3361 case ATA_DNXFER_40C:
3362 udma_mask &= ATA_UDMA_MASK_40C;
3363 break;
3364
3365 case ATA_DNXFER_FORCE_PIO0:
3366 pio_mask &= 1;
3367 case ATA_DNXFER_FORCE_PIO:
3368 mwdma_mask = 0;
3369 udma_mask = 0;
3370 break;
3371
3372 default:
3373 BUG();
3374 }
3375
3376 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3377
3378 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3379 return -ENOENT;
3380
3381 if (!quiet) {
3382 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3383 snprintf(buf, sizeof(buf), "%s:%s",
3384 ata_mode_string(xfer_mask),
3385 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3386 else
3387 snprintf(buf, sizeof(buf), "%s",
3388 ata_mode_string(xfer_mask));
3389
3390 ata_dev_printk(dev, KERN_WARNING,
3391 "limiting speed to %s\n", buf);
3392 }
3393
3394 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3395 &dev->udma_mask);
3396
3397 return 0;
3398 }
3399
3400 static int ata_dev_set_mode(struct ata_device *dev)
3401 {
3402 struct ata_port *ap = dev->link->ap;
3403 struct ata_eh_context *ehc = &dev->link->eh_context;
3404 const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3405 const char *dev_err_whine = "";
3406 int ign_dev_err = 0;
3407 unsigned int err_mask = 0;
3408 int rc;
3409
3410 dev->flags &= ~ATA_DFLAG_PIO;
3411 if (dev->xfer_shift == ATA_SHIFT_PIO)
3412 dev->flags |= ATA_DFLAG_PIO;
3413
3414 if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3415 dev_err_whine = " (SET_XFERMODE skipped)";
3416 else {
3417 if (nosetxfer)
3418 ata_dev_printk(dev, KERN_WARNING,
3419 "NOSETXFER but PATA detected - can't "
3420 "skip SETXFER, might malfunction\n");
3421 err_mask = ata_dev_set_xfermode(dev);
3422 }
3423
3424 if (err_mask & ~AC_ERR_DEV)
3425 goto fail;
3426
3427 /* revalidate */
3428 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3429 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3430 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3431 if (rc)
3432 return rc;
3433
3434 if (dev->xfer_shift == ATA_SHIFT_PIO) {
3435 /* Old CFA may refuse this command, which is just fine */
3436 if (ata_id_is_cfa(dev->id))
3437 ign_dev_err = 1;
3438 /* Catch several broken garbage emulations plus some pre
3439 ATA devices */
3440 if (ata_id_major_version(dev->id) == 0 &&
3441 dev->pio_mode <= XFER_PIO_2)
3442 ign_dev_err = 1;
3443 /* Some very old devices and some bad newer ones fail
3444 any kind of SET_XFERMODE request but support PIO0-2
3445 timings and no IORDY */
3446 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3447 ign_dev_err = 1;
3448 }
3449 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3450 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3451 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3452 dev->dma_mode == XFER_MW_DMA_0 &&
3453 (dev->id[63] >> 8) & 1)
3454 ign_dev_err = 1;
3455
3456 /* if the device is actually configured correctly, ignore dev err */
3457 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3458 ign_dev_err = 1;
3459
3460 if (err_mask & AC_ERR_DEV) {
3461 if (!ign_dev_err)
3462 goto fail;
3463 else
3464 dev_err_whine = " (device error ignored)";
3465 }
3466
3467 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3468 dev->xfer_shift, (int)dev->xfer_mode);
3469
3470 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3471 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3472 dev_err_whine);
3473
3474 return 0;
3475
3476 fail:
3477 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3478 "(err_mask=0x%x)\n", err_mask);
3479 return -EIO;
3480 }
3481
3482 /**
3483 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3484 * @link: link on which timings will be programmed
3485 * @r_failed_dev: out parameter for failed device
3486 *
3487 * Standard implementation of the function used to tune and set
3488 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3489 * ata_dev_set_mode() fails, pointer to the failing device is
3490 * returned in @r_failed_dev.
3491 *
3492 * LOCKING:
3493 * PCI/etc. bus probe sem.
3494 *
3495 * RETURNS:
3496 * 0 on success, negative errno otherwise
3497 */
3498
3499 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3500 {
3501 struct ata_port *ap = link->ap;
3502 struct ata_device *dev;
3503 int rc = 0, used_dma = 0, found = 0;
3504
3505 /* step 1: calculate xfer_mask */
3506 ata_for_each_dev(dev, link, ENABLED) {
3507 unsigned long pio_mask, dma_mask;
3508 unsigned int mode_mask;
3509
3510 mode_mask = ATA_DMA_MASK_ATA;
3511 if (dev->class == ATA_DEV_ATAPI)
3512 mode_mask = ATA_DMA_MASK_ATAPI;
3513 else if (ata_id_is_cfa(dev->id))
3514 mode_mask = ATA_DMA_MASK_CFA;
3515
3516 ata_dev_xfermask(dev);
3517 ata_force_xfermask(dev);
3518
3519 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3520 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3521
3522 if (libata_dma_mask & mode_mask)
3523 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3524 else
3525 dma_mask = 0;
3526
3527 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3528 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3529
3530 found = 1;
3531 if (ata_dma_enabled(dev))
3532 used_dma = 1;
3533 }
3534 if (!found)
3535 goto out;
3536
3537 /* step 2: always set host PIO timings */
3538 ata_for_each_dev(dev, link, ENABLED) {
3539 if (dev->pio_mode == 0xff) {
3540 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3541 rc = -EINVAL;
3542 goto out;
3543 }
3544
3545 dev->xfer_mode = dev->pio_mode;
3546 dev->xfer_shift = ATA_SHIFT_PIO;
3547 if (ap->ops->set_piomode)
3548 ap->ops->set_piomode(ap, dev);
3549 }
3550
3551 /* step 3: set host DMA timings */
3552 ata_for_each_dev(dev, link, ENABLED) {
3553 if (!ata_dma_enabled(dev))
3554 continue;
3555
3556 dev->xfer_mode = dev->dma_mode;
3557 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3558 if (ap->ops->set_dmamode)
3559 ap->ops->set_dmamode(ap, dev);
3560 }
3561
3562 /* step 4: update devices' xfer mode */
3563 ata_for_each_dev(dev, link, ENABLED) {
3564 rc = ata_dev_set_mode(dev);
3565 if (rc)
3566 goto out;
3567 }
3568
3569 /* Record simplex status. If we selected DMA then the other
3570 * host channels are not permitted to do so.
3571 */
3572 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3573 ap->host->simplex_claimed = ap;
3574
3575 out:
3576 if (rc)
3577 *r_failed_dev = dev;
3578 return rc;
3579 }
3580
3581 /**
3582 * ata_wait_ready - wait for link to become ready
3583 * @link: link to be waited on
3584 * @deadline: deadline jiffies for the operation
3585 * @check_ready: callback to check link readiness
3586 *
3587 * Wait for @link to become ready. @check_ready should return
3588 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3589 * link doesn't seem to be occupied, other errno for other error
3590 * conditions.
3591 *
3592 * Transient -ENODEV conditions are allowed for
3593 * ATA_TMOUT_FF_WAIT.
3594 *
3595 * LOCKING:
3596 * EH context.
3597 *
3598 * RETURNS:
3599 * 0 if @linke is ready before @deadline; otherwise, -errno.
3600 */
3601 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3602 int (*check_ready)(struct ata_link *link))
3603 {
3604 unsigned long start = jiffies;
3605 unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3606 int warned = 0;
3607
3608 /* Slave readiness can't be tested separately from master. On
3609 * M/S emulation configuration, this function should be called
3610 * only on the master and it will handle both master and slave.
3611 */
3612 WARN_ON(link == link->ap->slave_link);
3613
3614 if (time_after(nodev_deadline, deadline))
3615 nodev_deadline = deadline;
3616
3617 while (1) {
3618 unsigned long now = jiffies;
3619 int ready, tmp;
3620
3621 ready = tmp = check_ready(link);
3622 if (ready > 0)
3623 return 0;
3624
3625 /* -ENODEV could be transient. Ignore -ENODEV if link
3626 * is online. Also, some SATA devices take a long
3627 * time to clear 0xff after reset. For example,
3628 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3629 * GoVault needs even more than that. Wait for
3630 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3631 *
3632 * Note that some PATA controllers (pata_ali) explode
3633 * if status register is read more than once when
3634 * there's no device attached.
3635 */
3636 if (ready == -ENODEV) {
3637 if (ata_link_online(link))
3638 ready = 0;
3639 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3640 !ata_link_offline(link) &&
3641 time_before(now, nodev_deadline))
3642 ready = 0;
3643 }
3644
3645 if (ready)
3646 return ready;
3647 if (time_after(now, deadline))
3648 return -EBUSY;
3649
3650 if (!warned && time_after(now, start + 5 * HZ) &&
3651 (deadline - now > 3 * HZ)) {
3652 ata_link_printk(link, KERN_WARNING,
3653 "link is slow to respond, please be patient "
3654 "(ready=%d)\n", tmp);
3655 warned = 1;
3656 }
3657
3658 msleep(50);
3659 }
3660 }
3661
3662 /**
3663 * ata_wait_after_reset - wait for link to become ready after reset
3664 * @link: link to be waited on
3665 * @deadline: deadline jiffies for the operation
3666 * @check_ready: callback to check link readiness
3667 *
3668 * Wait for @link to become ready after reset.
3669 *
3670 * LOCKING:
3671 * EH context.
3672 *
3673 * RETURNS:
3674 * 0 if @linke is ready before @deadline; otherwise, -errno.
3675 */
3676 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3677 int (*check_ready)(struct ata_link *link))
3678 {
3679 msleep(ATA_WAIT_AFTER_RESET);
3680
3681 return ata_wait_ready(link, deadline, check_ready);
3682 }
3683
3684 /**
3685 * sata_link_debounce - debounce SATA phy status
3686 * @link: ATA link to debounce SATA phy status for
3687 * @params: timing parameters { interval, duratinon, timeout } in msec
3688 * @deadline: deadline jiffies for the operation
3689 *
3690 * Make sure SStatus of @link reaches stable state, determined by
3691 * holding the same value where DET is not 1 for @duration polled
3692 * every @interval, before @timeout. Timeout constraints the
3693 * beginning of the stable state. Because DET gets stuck at 1 on
3694 * some controllers after hot unplugging, this functions waits
3695 * until timeout then returns 0 if DET is stable at 1.
3696 *
3697 * @timeout is further limited by @deadline. The sooner of the
3698 * two is used.
3699 *
3700 * LOCKING:
3701 * Kernel thread context (may sleep)
3702 *
3703 * RETURNS:
3704 * 0 on success, -errno on failure.
3705 */
3706 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3707 unsigned long deadline)
3708 {
3709 unsigned long interval = params[0];
3710 unsigned long duration = params[1];
3711 unsigned long last_jiffies, t;
3712 u32 last, cur;
3713 int rc;
3714
3715 t = ata_deadline(jiffies, params[2]);
3716 if (time_before(t, deadline))
3717 deadline = t;
3718
3719 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3720 return rc;
3721 cur &= 0xf;
3722
3723 last = cur;
3724 last_jiffies = jiffies;
3725
3726 while (1) {
3727 msleep(interval);
3728 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3729 return rc;
3730 cur &= 0xf;
3731
3732 /* DET stable? */
3733 if (cur == last) {
3734 if (cur == 1 && time_before(jiffies, deadline))
3735 continue;
3736 if (time_after(jiffies,
3737 ata_deadline(last_jiffies, duration)))
3738 return 0;
3739 continue;
3740 }
3741
3742 /* unstable, start over */
3743 last = cur;
3744 last_jiffies = jiffies;
3745
3746 /* Check deadline. If debouncing failed, return
3747 * -EPIPE to tell upper layer to lower link speed.
3748 */
3749 if (time_after(jiffies, deadline))
3750 return -EPIPE;
3751 }
3752 }
3753
3754 /**
3755 * sata_link_resume - resume SATA link
3756 * @link: ATA link to resume SATA
3757 * @params: timing parameters { interval, duratinon, timeout } in msec
3758 * @deadline: deadline jiffies for the operation
3759 *
3760 * Resume SATA phy @link and debounce it.
3761 *
3762 * LOCKING:
3763 * Kernel thread context (may sleep)
3764 *
3765 * RETURNS:
3766 * 0 on success, -errno on failure.
3767 */
3768 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3769 unsigned long deadline)
3770 {
3771 u32 scontrol, serror;
3772 int rc;
3773
3774 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3775 return rc;
3776
3777 scontrol = (scontrol & 0x0f0) | 0x300;
3778
3779 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3780 return rc;
3781
3782 /* Some PHYs react badly if SStatus is pounded immediately
3783 * after resuming. Delay 200ms before debouncing.
3784 */
3785 msleep(200);
3786
3787 if ((rc = sata_link_debounce(link, params, deadline)))
3788 return rc;
3789
3790 /* clear SError, some PHYs require this even for SRST to work */
3791 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3792 rc = sata_scr_write(link, SCR_ERROR, serror);
3793
3794 return rc != -EINVAL ? rc : 0;
3795 }
3796
3797 /**
3798 * ata_std_prereset - prepare for reset
3799 * @link: ATA link to be reset
3800 * @deadline: deadline jiffies for the operation
3801 *
3802 * @link is about to be reset. Initialize it. Failure from
3803 * prereset makes libata abort whole reset sequence and give up
3804 * that port, so prereset should be best-effort. It does its
3805 * best to prepare for reset sequence but if things go wrong, it
3806 * should just whine, not fail.
3807 *
3808 * LOCKING:
3809 * Kernel thread context (may sleep)
3810 *
3811 * RETURNS:
3812 * 0 on success, -errno otherwise.
3813 */
3814 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3815 {
3816 struct ata_port *ap = link->ap;
3817 struct ata_eh_context *ehc = &link->eh_context;
3818 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3819 int rc;
3820
3821 /* if we're about to do hardreset, nothing more to do */
3822 if (ehc->i.action & ATA_EH_HARDRESET)
3823 return 0;
3824
3825 /* if SATA, resume link */
3826 if (ap->flags & ATA_FLAG_SATA) {
3827 rc = sata_link_resume(link, timing, deadline);
3828 /* whine about phy resume failure but proceed */
3829 if (rc && rc != -EOPNOTSUPP)
3830 ata_link_printk(link, KERN_WARNING, "failed to resume "
3831 "link for reset (errno=%d)\n", rc);
3832 }
3833
3834 /* no point in trying softreset on offline link */
3835 if (ata_phys_link_offline(link))
3836 ehc->i.action &= ~ATA_EH_SOFTRESET;
3837
3838 return 0;
3839 }
3840
3841 /**
3842 * sata_link_hardreset - reset link via SATA phy reset
3843 * @link: link to reset
3844 * @timing: timing parameters { interval, duratinon, timeout } in msec
3845 * @deadline: deadline jiffies for the operation
3846 * @online: optional out parameter indicating link onlineness
3847 * @check_ready: optional callback to check link readiness
3848 *
3849 * SATA phy-reset @link using DET bits of SControl register.
3850 * After hardreset, link readiness is waited upon using
3851 * ata_wait_ready() if @check_ready is specified. LLDs are
3852 * allowed to not specify @check_ready and wait itself after this
3853 * function returns. Device classification is LLD's
3854 * responsibility.
3855 *
3856 * *@online is set to one iff reset succeeded and @link is online
3857 * after reset.
3858 *
3859 * LOCKING:
3860 * Kernel thread context (may sleep)
3861 *
3862 * RETURNS:
3863 * 0 on success, -errno otherwise.
3864 */
3865 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3866 unsigned long deadline,
3867 bool *online, int (*check_ready)(struct ata_link *))
3868 {
3869 u32 scontrol;
3870 int rc;
3871
3872 DPRINTK("ENTER\n");
3873
3874 if (online)
3875 *online = false;
3876
3877 if (sata_set_spd_needed(link)) {
3878 /* SATA spec says nothing about how to reconfigure
3879 * spd. To be on the safe side, turn off phy during
3880 * reconfiguration. This works for at least ICH7 AHCI
3881 * and Sil3124.
3882 */
3883 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3884 goto out;
3885
3886 scontrol = (scontrol & 0x0f0) | 0x304;
3887
3888 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3889 goto out;
3890
3891 sata_set_spd(link);
3892 }
3893
3894 /* issue phy wake/reset */
3895 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3896 goto out;
3897
3898 scontrol = (scontrol & 0x0f0) | 0x301;
3899
3900 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3901 goto out;
3902
3903 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3904 * 10.4.2 says at least 1 ms.
3905 */
3906 msleep(1);
3907
3908 /* bring link back */
3909 rc = sata_link_resume(link, timing, deadline);
3910 if (rc)
3911 goto out;
3912 /* if link is offline nothing more to do */
3913 if (ata_phys_link_offline(link))
3914 goto out;
3915
3916 /* Link is online. From this point, -ENODEV too is an error. */
3917 if (online)
3918 *online = true;
3919
3920 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3921 /* If PMP is supported, we have to do follow-up SRST.
3922 * Some PMPs don't send D2H Reg FIS after hardreset if
3923 * the first port is empty. Wait only for
3924 * ATA_TMOUT_PMP_SRST_WAIT.
3925 */
3926 if (check_ready) {
3927 unsigned long pmp_deadline;
3928
3929 pmp_deadline = ata_deadline(jiffies,
3930 ATA_TMOUT_PMP_SRST_WAIT);
3931 if (time_after(pmp_deadline, deadline))
3932 pmp_deadline = deadline;
3933 ata_wait_ready(link, pmp_deadline, check_ready);
3934 }
3935 rc = -EAGAIN;
3936 goto out;
3937 }
3938
3939 rc = 0;
3940 if (check_ready)
3941 rc = ata_wait_ready(link, deadline, check_ready);
3942 out:
3943 if (rc && rc != -EAGAIN) {
3944 /* online is set iff link is online && reset succeeded */
3945 if (online)
3946 *online = false;
3947 ata_link_printk(link, KERN_ERR,
3948 "COMRESET failed (errno=%d)\n", rc);
3949 }
3950 DPRINTK("EXIT, rc=%d\n", rc);
3951 return rc;
3952 }
3953
3954 /**
3955 * sata_std_hardreset - COMRESET w/o waiting or classification
3956 * @link: link to reset
3957 * @class: resulting class of attached device
3958 * @deadline: deadline jiffies for the operation
3959 *
3960 * Standard SATA COMRESET w/o waiting or classification.
3961 *
3962 * LOCKING:
3963 * Kernel thread context (may sleep)
3964 *
3965 * RETURNS:
3966 * 0 if link offline, -EAGAIN if link online, -errno on errors.
3967 */
3968 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3969 unsigned long deadline)
3970 {
3971 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3972 bool online;
3973 int rc;
3974
3975 /* do hardreset */
3976 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
3977 return online ? -EAGAIN : rc;
3978 }
3979
3980 /**
3981 * ata_std_postreset - standard postreset callback
3982 * @link: the target ata_link
3983 * @classes: classes of attached devices
3984 *
3985 * This function is invoked after a successful reset. Note that
3986 * the device might have been reset more than once using
3987 * different reset methods before postreset is invoked.
3988 *
3989 * LOCKING:
3990 * Kernel thread context (may sleep)
3991 */
3992 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3993 {
3994 u32 serror;
3995
3996 DPRINTK("ENTER\n");
3997
3998 /* reset complete, clear SError */
3999 if (!sata_scr_read(link, SCR_ERROR, &serror))
4000 sata_scr_write(link, SCR_ERROR, serror);
4001
4002 /* print link status */
4003 sata_print_link_status(link);
4004
4005 DPRINTK("EXIT\n");
4006 }
4007
4008 /**
4009 * ata_dev_same_device - Determine whether new ID matches configured device
4010 * @dev: device to compare against
4011 * @new_class: class of the new device
4012 * @new_id: IDENTIFY page of the new device
4013 *
4014 * Compare @new_class and @new_id against @dev and determine
4015 * whether @dev is the device indicated by @new_class and
4016 * @new_id.
4017 *
4018 * LOCKING:
4019 * None.
4020 *
4021 * RETURNS:
4022 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
4023 */
4024 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
4025 const u16 *new_id)
4026 {
4027 const u16 *old_id = dev->id;
4028 unsigned char model[2][ATA_ID_PROD_LEN + 1];
4029 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4030
4031 if (dev->class != new_class) {
4032 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
4033 dev->class, new_class);
4034 return 0;
4035 }
4036
4037 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
4038 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
4039 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
4040 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4041
4042 if (strcmp(model[0], model[1])) {
4043 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
4044 "'%s' != '%s'\n", model[0], model[1]);
4045 return 0;
4046 }
4047
4048 if (strcmp(serial[0], serial[1])) {
4049 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
4050 "'%s' != '%s'\n", serial[0], serial[1]);
4051 return 0;
4052 }
4053
4054 return 1;
4055 }
4056
4057 /**
4058 * ata_dev_reread_id - Re-read IDENTIFY data
4059 * @dev: target ATA device
4060 * @readid_flags: read ID flags
4061 *
4062 * Re-read IDENTIFY page and make sure @dev is still attached to
4063 * the port.
4064 *
4065 * LOCKING:
4066 * Kernel thread context (may sleep)
4067 *
4068 * RETURNS:
4069 * 0 on success, negative errno otherwise
4070 */
4071 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4072 {
4073 unsigned int class = dev->class;
4074 u16 *id = (void *)dev->link->ap->sector_buf;
4075 int rc;
4076
4077 /* read ID data */
4078 rc = ata_dev_read_id(dev, &class, readid_flags, id);
4079 if (rc)
4080 return rc;
4081
4082 /* is the device still there? */
4083 if (!ata_dev_same_device(dev, class, id))
4084 return -ENODEV;
4085
4086 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4087 return 0;
4088 }
4089
4090 /**
4091 * ata_dev_revalidate - Revalidate ATA device
4092 * @dev: device to revalidate
4093 * @new_class: new class code
4094 * @readid_flags: read ID flags
4095 *
4096 * Re-read IDENTIFY page, make sure @dev is still attached to the
4097 * port and reconfigure it according to the new IDENTIFY page.
4098 *
4099 * LOCKING:
4100 * Kernel thread context (may sleep)
4101 *
4102 * RETURNS:
4103 * 0 on success, negative errno otherwise
4104 */
4105 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4106 unsigned int readid_flags)
4107 {
4108 u64 n_sectors = dev->n_sectors;
4109 u64 n_native_sectors = dev->n_native_sectors;
4110 int rc;
4111
4112 if (!ata_dev_enabled(dev))
4113 return -ENODEV;
4114
4115 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4116 if (ata_class_enabled(new_class) &&
4117 new_class != ATA_DEV_ATA &&
4118 new_class != ATA_DEV_ATAPI &&
4119 new_class != ATA_DEV_SEMB) {
4120 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
4121 dev->class, new_class);
4122 rc = -ENODEV;
4123 goto fail;
4124 }
4125
4126 /* re-read ID */
4127 rc = ata_dev_reread_id(dev, readid_flags);
4128 if (rc)
4129 goto fail;
4130
4131 /* configure device according to the new ID */
4132 rc = ata_dev_configure(dev);
4133 if (rc)
4134 goto fail;
4135
4136 /* verify n_sectors hasn't changed */
4137 if (dev->class == ATA_DEV_ATA && n_sectors &&
4138 dev->n_sectors != n_sectors) {
4139 ata_dev_printk(dev, KERN_WARNING, "n_sectors mismatch "
4140 "%llu != %llu\n",
4141 (unsigned long long)n_sectors,
4142 (unsigned long long)dev->n_sectors);
4143 /*
4144 * Something could have caused HPA to be unlocked
4145 * involuntarily. If n_native_sectors hasn't changed
4146 * and the new size matches it, keep the device.
4147 */
4148 if (dev->n_native_sectors == n_native_sectors &&
4149 dev->n_sectors > n_sectors &&
4150 dev->n_sectors == n_native_sectors) {
4151 ata_dev_printk(dev, KERN_WARNING,
4152 "new n_sectors matches native, probably "
4153 "late HPA unlock, continuing\n");
4154 /* keep using the old n_sectors */
4155 dev->n_sectors = n_sectors;
4156 } else {
4157 /* restore original n_[native]_sectors and fail */
4158 dev->n_native_sectors = n_native_sectors;
4159 dev->n_sectors = n_sectors;
4160 rc = -ENODEV;
4161 goto fail;
4162 }
4163 }
4164
4165 return 0;
4166
4167 fail:
4168 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4169 return rc;
4170 }
4171
4172 struct ata_blacklist_entry {
4173 const char *model_num;
4174 const char *model_rev;
4175 unsigned long horkage;
4176 };
4177
4178 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4179 /* Devices with DMA related problems under Linux */
4180 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4181 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4182 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4183 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4184 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4185 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4186 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4187 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4188 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4189 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
4190 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
4191 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4192 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4193 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4194 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4195 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4196 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
4197 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
4198 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4199 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4200 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4201 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4202 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4203 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4204 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4205 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4206 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4207 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4208 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4209 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4210 /* Odd clown on sil3726/4726 PMPs */
4211 { "Config Disk", NULL, ATA_HORKAGE_DISABLE },
4212
4213 /* Weird ATAPI devices */
4214 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4215 { "QUANTUM DAT DAT72-000", NULL, ATA_HORKAGE_ATAPI_MOD16_DMA },
4216
4217 /* Devices we expect to fail diagnostics */
4218
4219 /* Devices where NCQ should be avoided */
4220 /* NCQ is slow */
4221 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4222 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4223 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4224 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4225 /* NCQ is broken */
4226 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4227 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4228 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4229 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4230 { "OCZ CORE_SSD", "02.10104", ATA_HORKAGE_NONCQ },
4231
4232 /* Seagate NCQ + FLUSH CACHE firmware bug */
4233 { "ST31500341AS", "SD15", ATA_HORKAGE_NONCQ |
4234 ATA_HORKAGE_FIRMWARE_WARN },
4235 { "ST31500341AS", "SD16", ATA_HORKAGE_NONCQ |
4236 ATA_HORKAGE_FIRMWARE_WARN },
4237 { "ST31500341AS", "SD17", ATA_HORKAGE_NONCQ |
4238 ATA_HORKAGE_FIRMWARE_WARN },
4239 { "ST31500341AS", "SD18", ATA_HORKAGE_NONCQ |
4240 ATA_HORKAGE_FIRMWARE_WARN },
4241 { "ST31500341AS", "SD19", ATA_HORKAGE_NONCQ |
4242 ATA_HORKAGE_FIRMWARE_WARN },
4243
4244 { "ST31000333AS", "SD15", ATA_HORKAGE_NONCQ |
4245 ATA_HORKAGE_FIRMWARE_WARN },
4246 { "ST31000333AS", "SD16", ATA_HORKAGE_NONCQ |
4247 ATA_HORKAGE_FIRMWARE_WARN },
4248 { "ST31000333AS", "SD17", ATA_HORKAGE_NONCQ |
4249 ATA_HORKAGE_FIRMWARE_WARN },
4250 { "ST31000333AS", "SD18", ATA_HORKAGE_NONCQ |
4251 ATA_HORKAGE_FIRMWARE_WARN },
4252 { "ST31000333AS", "SD19", ATA_HORKAGE_NONCQ |
4253 ATA_HORKAGE_FIRMWARE_WARN },
4254
4255 { "ST3640623AS", "SD15", ATA_HORKAGE_NONCQ |
4256 ATA_HORKAGE_FIRMWARE_WARN },
4257 { "ST3640623AS", "SD16", ATA_HORKAGE_NONCQ |
4258 ATA_HORKAGE_FIRMWARE_WARN },
4259 { "ST3640623AS", "SD17", ATA_HORKAGE_NONCQ |
4260 ATA_HORKAGE_FIRMWARE_WARN },
4261 { "ST3640623AS", "SD18", ATA_HORKAGE_NONCQ |
4262 ATA_HORKAGE_FIRMWARE_WARN },
4263 { "ST3640623AS", "SD19", ATA_HORKAGE_NONCQ |
4264 ATA_HORKAGE_FIRMWARE_WARN },
4265
4266 { "ST3640323AS", "SD15", ATA_HORKAGE_NONCQ |
4267 ATA_HORKAGE_FIRMWARE_WARN },
4268 { "ST3640323AS", "SD16", ATA_HORKAGE_NONCQ |
4269 ATA_HORKAGE_FIRMWARE_WARN },
4270 { "ST3640323AS", "SD17", ATA_HORKAGE_NONCQ |
4271 ATA_HORKAGE_FIRMWARE_WARN },
4272 { "ST3640323AS", "SD18", ATA_HORKAGE_NONCQ |
4273 ATA_HORKAGE_FIRMWARE_WARN },
4274 { "ST3640323AS", "SD19", ATA_HORKAGE_NONCQ |
4275 ATA_HORKAGE_FIRMWARE_WARN },
4276
4277 { "ST3320813AS", "SD15", ATA_HORKAGE_NONCQ |
4278 ATA_HORKAGE_FIRMWARE_WARN },
4279 { "ST3320813AS", "SD16", ATA_HORKAGE_NONCQ |
4280 ATA_HORKAGE_FIRMWARE_WARN },
4281 { "ST3320813AS", "SD17", ATA_HORKAGE_NONCQ |
4282 ATA_HORKAGE_FIRMWARE_WARN },
4283 { "ST3320813AS", "SD18", ATA_HORKAGE_NONCQ |
4284 ATA_HORKAGE_FIRMWARE_WARN },
4285 { "ST3320813AS", "SD19", ATA_HORKAGE_NONCQ |
4286 ATA_HORKAGE_FIRMWARE_WARN },
4287
4288 { "ST3320613AS", "SD15", ATA_HORKAGE_NONCQ |
4289 ATA_HORKAGE_FIRMWARE_WARN },
4290 { "ST3320613AS", "SD16", ATA_HORKAGE_NONCQ |
4291 ATA_HORKAGE_FIRMWARE_WARN },
4292 { "ST3320613AS", "SD17", ATA_HORKAGE_NONCQ |
4293 ATA_HORKAGE_FIRMWARE_WARN },
4294 { "ST3320613AS", "SD18", ATA_HORKAGE_NONCQ |
4295 ATA_HORKAGE_FIRMWARE_WARN },
4296 { "ST3320613AS", "SD19", ATA_HORKAGE_NONCQ |
4297 ATA_HORKAGE_FIRMWARE_WARN },
4298
4299 /* Blacklist entries taken from Silicon Image 3124/3132
4300 Windows driver .inf file - also several Linux problem reports */
4301 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4302 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4303 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4304
4305 /* devices which puke on READ_NATIVE_MAX */
4306 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4307 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4308 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4309 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4310
4311 /* this one allows HPA unlocking but fails IOs on the area */
4312 { "OCZ-VERTEX", "1.30", ATA_HORKAGE_BROKEN_HPA },
4313
4314 /* Devices which report 1 sector over size HPA */
4315 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4316 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4317 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
4318
4319 /* Devices which get the IVB wrong */
4320 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4321 /* Maybe we should just blacklist TSSTcorp... */
4322 { "TSSTcorp CDDVDW SH-S202H", "SB00", ATA_HORKAGE_IVB, },
4323 { "TSSTcorp CDDVDW SH-S202H", "SB01", ATA_HORKAGE_IVB, },
4324 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
4325 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
4326 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
4327 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
4328
4329 /* Devices that do not need bridging limits applied */
4330 { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, },
4331
4332 /* Devices which aren't very happy with higher link speeds */
4333 { "WD My Book", NULL, ATA_HORKAGE_1_5_GBPS, },
4334
4335 /*
4336 * Devices which choke on SETXFER. Applies only if both the
4337 * device and controller are SATA.
4338 */
4339 { "PIONEER DVD-RW DVRTD08", "1.00", ATA_HORKAGE_NOSETXFER },
4340
4341 /* End Marker */
4342 { }
4343 };
4344
4345 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4346 {
4347 const char *p;
4348 int len;
4349
4350 /*
4351 * check for trailing wildcard: *\0
4352 */
4353 p = strchr(patt, wildchar);
4354 if (p && ((*(p + 1)) == 0))
4355 len = p - patt;
4356 else {
4357 len = strlen(name);
4358 if (!len) {
4359 if (!*patt)
4360 return 0;
4361 return -1;
4362 }
4363 }
4364
4365 return strncmp(patt, name, len);
4366 }
4367
4368 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4369 {
4370 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4371 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4372 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4373
4374 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4375 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4376
4377 while (ad->model_num) {
4378 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4379 if (ad->model_rev == NULL)
4380 return ad->horkage;
4381 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4382 return ad->horkage;
4383 }
4384 ad++;
4385 }
4386 return 0;
4387 }
4388
4389 static int ata_dma_blacklisted(const struct ata_device *dev)
4390 {
4391 /* We don't support polling DMA.
4392 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4393 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4394 */
4395 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4396 (dev->flags & ATA_DFLAG_CDB_INTR))
4397 return 1;
4398 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4399 }
4400
4401 /**
4402 * ata_is_40wire - check drive side detection
4403 * @dev: device
4404 *
4405 * Perform drive side detection decoding, allowing for device vendors
4406 * who can't follow the documentation.
4407 */
4408
4409 static int ata_is_40wire(struct ata_device *dev)
4410 {
4411 if (dev->horkage & ATA_HORKAGE_IVB)
4412 return ata_drive_40wire_relaxed(dev->id);
4413 return ata_drive_40wire(dev->id);
4414 }
4415
4416 /**
4417 * cable_is_40wire - 40/80/SATA decider
4418 * @ap: port to consider
4419 *
4420 * This function encapsulates the policy for speed management
4421 * in one place. At the moment we don't cache the result but
4422 * there is a good case for setting ap->cbl to the result when
4423 * we are called with unknown cables (and figuring out if it
4424 * impacts hotplug at all).
4425 *
4426 * Return 1 if the cable appears to be 40 wire.
4427 */
4428
4429 static int cable_is_40wire(struct ata_port *ap)
4430 {
4431 struct ata_link *link;
4432 struct ata_device *dev;
4433
4434 /* If the controller thinks we are 40 wire, we are. */
4435 if (ap->cbl == ATA_CBL_PATA40)
4436 return 1;
4437
4438 /* If the controller thinks we are 80 wire, we are. */
4439 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4440 return 0;
4441
4442 /* If the system is known to be 40 wire short cable (eg
4443 * laptop), then we allow 80 wire modes even if the drive
4444 * isn't sure.
4445 */
4446 if (ap->cbl == ATA_CBL_PATA40_SHORT)
4447 return 0;
4448
4449 /* If the controller doesn't know, we scan.
4450 *
4451 * Note: We look for all 40 wire detects at this point. Any
4452 * 80 wire detect is taken to be 80 wire cable because
4453 * - in many setups only the one drive (slave if present) will
4454 * give a valid detect
4455 * - if you have a non detect capable drive you don't want it
4456 * to colour the choice
4457 */
4458 ata_for_each_link(link, ap, EDGE) {
4459 ata_for_each_dev(dev, link, ENABLED) {
4460 if (!ata_is_40wire(dev))
4461 return 0;
4462 }
4463 }
4464 return 1;
4465 }
4466
4467 /**
4468 * ata_dev_xfermask - Compute supported xfermask of the given device
4469 * @dev: Device to compute xfermask for
4470 *
4471 * Compute supported xfermask of @dev and store it in
4472 * dev->*_mask. This function is responsible for applying all
4473 * known limits including host controller limits, device
4474 * blacklist, etc...
4475 *
4476 * LOCKING:
4477 * None.
4478 */
4479 static void ata_dev_xfermask(struct ata_device *dev)
4480 {
4481 struct ata_link *link = dev->link;
4482 struct ata_port *ap = link->ap;
4483 struct ata_host *host = ap->host;
4484 unsigned long xfer_mask;
4485
4486 /* controller modes available */
4487 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4488 ap->mwdma_mask, ap->udma_mask);
4489
4490 /* drive modes available */
4491 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4492 dev->mwdma_mask, dev->udma_mask);
4493 xfer_mask &= ata_id_xfermask(dev->id);
4494
4495 /*
4496 * CFA Advanced TrueIDE timings are not allowed on a shared
4497 * cable
4498 */
4499 if (ata_dev_pair(dev)) {
4500 /* No PIO5 or PIO6 */
4501 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4502 /* No MWDMA3 or MWDMA 4 */
4503 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4504 }
4505
4506 if (ata_dma_blacklisted(dev)) {
4507 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4508 ata_dev_printk(dev, KERN_WARNING,
4509 "device is on DMA blacklist, disabling DMA\n");
4510 }
4511
4512 if ((host->flags & ATA_HOST_SIMPLEX) &&
4513 host->simplex_claimed && host->simplex_claimed != ap) {
4514 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4515 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4516 "other device, disabling DMA\n");
4517 }
4518
4519 if (ap->flags & ATA_FLAG_NO_IORDY)
4520 xfer_mask &= ata_pio_mask_no_iordy(dev);
4521
4522 if (ap->ops->mode_filter)
4523 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4524
4525 /* Apply cable rule here. Don't apply it early because when
4526 * we handle hot plug the cable type can itself change.
4527 * Check this last so that we know if the transfer rate was
4528 * solely limited by the cable.
4529 * Unknown or 80 wire cables reported host side are checked
4530 * drive side as well. Cases where we know a 40wire cable
4531 * is used safely for 80 are not checked here.
4532 */
4533 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4534 /* UDMA/44 or higher would be available */
4535 if (cable_is_40wire(ap)) {
4536 ata_dev_printk(dev, KERN_WARNING,
4537 "limited to UDMA/33 due to 40-wire cable\n");
4538 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4539 }
4540
4541 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4542 &dev->mwdma_mask, &dev->udma_mask);
4543 }
4544
4545 /**
4546 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4547 * @dev: Device to which command will be sent
4548 *
4549 * Issue SET FEATURES - XFER MODE command to device @dev
4550 * on port @ap.
4551 *
4552 * LOCKING:
4553 * PCI/etc. bus probe sem.
4554 *
4555 * RETURNS:
4556 * 0 on success, AC_ERR_* mask otherwise.
4557 */
4558
4559 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4560 {
4561 struct ata_taskfile tf;
4562 unsigned int err_mask;
4563
4564 /* set up set-features taskfile */
4565 DPRINTK("set features - xfer mode\n");
4566
4567 /* Some controllers and ATAPI devices show flaky interrupt
4568 * behavior after setting xfer mode. Use polling instead.
4569 */
4570 ata_tf_init(dev, &tf);
4571 tf.command = ATA_CMD_SET_FEATURES;
4572 tf.feature = SETFEATURES_XFER;
4573 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4574 tf.protocol = ATA_PROT_NODATA;
4575 /* If we are using IORDY we must send the mode setting command */
4576 if (ata_pio_need_iordy(dev))
4577 tf.nsect = dev->xfer_mode;
4578 /* If the device has IORDY and the controller does not - turn it off */
4579 else if (ata_id_has_iordy(dev->id))
4580 tf.nsect = 0x01;
4581 else /* In the ancient relic department - skip all of this */
4582 return 0;
4583
4584 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4585
4586 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4587 return err_mask;
4588 }
4589 /**
4590 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4591 * @dev: Device to which command will be sent
4592 * @enable: Whether to enable or disable the feature
4593 * @feature: The sector count represents the feature to set
4594 *
4595 * Issue SET FEATURES - SATA FEATURES command to device @dev
4596 * on port @ap with sector count
4597 *
4598 * LOCKING:
4599 * PCI/etc. bus probe sem.
4600 *
4601 * RETURNS:
4602 * 0 on success, AC_ERR_* mask otherwise.
4603 */
4604 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4605 u8 feature)
4606 {
4607 struct ata_taskfile tf;
4608 unsigned int err_mask;
4609
4610 /* set up set-features taskfile */
4611 DPRINTK("set features - SATA features\n");
4612
4613 ata_tf_init(dev, &tf);
4614 tf.command = ATA_CMD_SET_FEATURES;
4615 tf.feature = enable;
4616 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4617 tf.protocol = ATA_PROT_NODATA;
4618 tf.nsect = feature;
4619
4620 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4621
4622 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4623 return err_mask;
4624 }
4625
4626 /**
4627 * ata_dev_init_params - Issue INIT DEV PARAMS command
4628 * @dev: Device to which command will be sent
4629 * @heads: Number of heads (taskfile parameter)
4630 * @sectors: Number of sectors (taskfile parameter)
4631 *
4632 * LOCKING:
4633 * Kernel thread context (may sleep)
4634 *
4635 * RETURNS:
4636 * 0 on success, AC_ERR_* mask otherwise.
4637 */
4638 static unsigned int ata_dev_init_params(struct ata_device *dev,
4639 u16 heads, u16 sectors)
4640 {
4641 struct ata_taskfile tf;
4642 unsigned int err_mask;
4643
4644 /* Number of sectors per track 1-255. Number of heads 1-16 */
4645 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4646 return AC_ERR_INVALID;
4647
4648 /* set up init dev params taskfile */
4649 DPRINTK("init dev params \n");
4650
4651 ata_tf_init(dev, &tf);
4652 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4653 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4654 tf.protocol = ATA_PROT_NODATA;
4655 tf.nsect = sectors;
4656 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4657
4658 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4659 /* A clean abort indicates an original or just out of spec drive
4660 and we should continue as we issue the setup based on the
4661 drive reported working geometry */
4662 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4663 err_mask = 0;
4664
4665 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4666 return err_mask;
4667 }
4668
4669 /**
4670 * ata_sg_clean - Unmap DMA memory associated with command
4671 * @qc: Command containing DMA memory to be released
4672 *
4673 * Unmap all mapped DMA memory associated with this command.
4674 *
4675 * LOCKING:
4676 * spin_lock_irqsave(host lock)
4677 */
4678 void ata_sg_clean(struct ata_queued_cmd *qc)
4679 {
4680 struct ata_port *ap = qc->ap;
4681 struct scatterlist *sg = qc->sg;
4682 int dir = qc->dma_dir;
4683
4684 WARN_ON_ONCE(sg == NULL);
4685
4686 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4687
4688 if (qc->n_elem)
4689 dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
4690
4691 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4692 qc->sg = NULL;
4693 }
4694
4695 /**
4696 * atapi_check_dma - Check whether ATAPI DMA can be supported
4697 * @qc: Metadata associated with taskfile to check
4698 *
4699 * Allow low-level driver to filter ATA PACKET commands, returning
4700 * a status indicating whether or not it is OK to use DMA for the
4701 * supplied PACKET command.
4702 *
4703 * LOCKING:
4704 * spin_lock_irqsave(host lock)
4705 *
4706 * RETURNS: 0 when ATAPI DMA can be used
4707 * nonzero otherwise
4708 */
4709 int atapi_check_dma(struct ata_queued_cmd *qc)
4710 {
4711 struct ata_port *ap = qc->ap;
4712
4713 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4714 * few ATAPI devices choke on such DMA requests.
4715 */
4716 if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4717 unlikely(qc->nbytes & 15))
4718 return 1;
4719
4720 if (ap->ops->check_atapi_dma)
4721 return ap->ops->check_atapi_dma(qc);
4722
4723 return 0;
4724 }
4725
4726 /**
4727 * ata_std_qc_defer - Check whether a qc needs to be deferred
4728 * @qc: ATA command in question
4729 *
4730 * Non-NCQ commands cannot run with any other command, NCQ or
4731 * not. As upper layer only knows the queue depth, we are
4732 * responsible for maintaining exclusion. This function checks
4733 * whether a new command @qc can be issued.
4734 *
4735 * LOCKING:
4736 * spin_lock_irqsave(host lock)
4737 *
4738 * RETURNS:
4739 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4740 */
4741 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4742 {
4743 struct ata_link *link = qc->dev->link;
4744
4745 if (qc->tf.protocol == ATA_PROT_NCQ) {
4746 if (!ata_tag_valid(link->active_tag))
4747 return 0;
4748 } else {
4749 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4750 return 0;
4751 }
4752
4753 return ATA_DEFER_LINK;
4754 }
4755
4756 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4757
4758 /**
4759 * ata_sg_init - Associate command with scatter-gather table.
4760 * @qc: Command to be associated
4761 * @sg: Scatter-gather table.
4762 * @n_elem: Number of elements in s/g table.
4763 *
4764 * Initialize the data-related elements of queued_cmd @qc
4765 * to point to a scatter-gather table @sg, containing @n_elem
4766 * elements.
4767 *
4768 * LOCKING:
4769 * spin_lock_irqsave(host lock)
4770 */
4771 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4772 unsigned int n_elem)
4773 {
4774 qc->sg = sg;
4775 qc->n_elem = n_elem;
4776 qc->cursg = qc->sg;
4777 }
4778
4779 /**
4780 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4781 * @qc: Command with scatter-gather table to be mapped.
4782 *
4783 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4784 *
4785 * LOCKING:
4786 * spin_lock_irqsave(host lock)
4787 *
4788 * RETURNS:
4789 * Zero on success, negative on error.
4790 *
4791 */
4792 static int ata_sg_setup(struct ata_queued_cmd *qc)
4793 {
4794 struct ata_port *ap = qc->ap;
4795 unsigned int n_elem;
4796
4797 VPRINTK("ENTER, ata%u\n", ap->print_id);
4798
4799 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4800 if (n_elem < 1)
4801 return -1;
4802
4803 DPRINTK("%d sg elements mapped\n", n_elem);
4804 qc->orig_n_elem = qc->n_elem;
4805 qc->n_elem = n_elem;
4806 qc->flags |= ATA_QCFLAG_DMAMAP;
4807
4808 return 0;
4809 }
4810
4811 /**
4812 * swap_buf_le16 - swap halves of 16-bit words in place
4813 * @buf: Buffer to swap
4814 * @buf_words: Number of 16-bit words in buffer.
4815 *
4816 * Swap halves of 16-bit words if needed to convert from
4817 * little-endian byte order to native cpu byte order, or
4818 * vice-versa.
4819 *
4820 * LOCKING:
4821 * Inherited from caller.
4822 */
4823 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4824 {
4825 #ifdef __BIG_ENDIAN
4826 unsigned int i;
4827
4828 for (i = 0; i < buf_words; i++)
4829 buf[i] = le16_to_cpu(buf[i]);
4830 #endif /* __BIG_ENDIAN */
4831 }
4832
4833 /**
4834 * ata_qc_new - Request an available ATA command, for queueing
4835 * @ap: target port
4836 *
4837 * LOCKING:
4838 * None.
4839 */
4840
4841 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4842 {
4843 struct ata_queued_cmd *qc = NULL;
4844 unsigned int i;
4845
4846 /* no command while frozen */
4847 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4848 return NULL;
4849
4850 /* the last tag is reserved for internal command. */
4851 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4852 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4853 qc = __ata_qc_from_tag(ap, i);
4854 break;
4855 }
4856
4857 if (qc)
4858 qc->tag = i;
4859
4860 return qc;
4861 }
4862
4863 /**
4864 * ata_qc_new_init - Request an available ATA command, and initialize it
4865 * @dev: Device from whom we request an available command structure
4866 *
4867 * LOCKING:
4868 * None.
4869 */
4870
4871 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4872 {
4873 struct ata_port *ap = dev->link->ap;
4874 struct ata_queued_cmd *qc;
4875
4876 qc = ata_qc_new(ap);
4877 if (qc) {
4878 qc->scsicmd = NULL;
4879 qc->ap = ap;
4880 qc->dev = dev;
4881
4882 ata_qc_reinit(qc);
4883 }
4884
4885 return qc;
4886 }
4887
4888 /**
4889 * ata_qc_free - free unused ata_queued_cmd
4890 * @qc: Command to complete
4891 *
4892 * Designed to free unused ata_queued_cmd object
4893 * in case something prevents using it.
4894 *
4895 * LOCKING:
4896 * spin_lock_irqsave(host lock)
4897 */
4898 void ata_qc_free(struct ata_queued_cmd *qc)
4899 {
4900 struct ata_port *ap = qc->ap;
4901 unsigned int tag;
4902
4903 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4904
4905 qc->flags = 0;
4906 tag = qc->tag;
4907 if (likely(ata_tag_valid(tag))) {
4908 qc->tag = ATA_TAG_POISON;
4909 clear_bit(tag, &ap->qc_allocated);
4910 }
4911 }
4912
4913 void __ata_qc_complete(struct ata_queued_cmd *qc)
4914 {
4915 struct ata_port *ap = qc->ap;
4916 struct ata_link *link = qc->dev->link;
4917
4918 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4919 WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4920
4921 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4922 ata_sg_clean(qc);
4923
4924 /* command should be marked inactive atomically with qc completion */
4925 if (qc->tf.protocol == ATA_PROT_NCQ) {
4926 link->sactive &= ~(1 << qc->tag);
4927 if (!link->sactive)
4928 ap->nr_active_links--;
4929 } else {
4930 link->active_tag = ATA_TAG_POISON;
4931 ap->nr_active_links--;
4932 }
4933
4934 /* clear exclusive status */
4935 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4936 ap->excl_link == link))
4937 ap->excl_link = NULL;
4938
4939 /* atapi: mark qc as inactive to prevent the interrupt handler
4940 * from completing the command twice later, before the error handler
4941 * is called. (when rc != 0 and atapi request sense is needed)
4942 */
4943 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4944 ap->qc_active &= ~(1 << qc->tag);
4945
4946 /* call completion callback */
4947 qc->complete_fn(qc);
4948 }
4949
4950 static void fill_result_tf(struct ata_queued_cmd *qc)
4951 {
4952 struct ata_port *ap = qc->ap;
4953
4954 qc->result_tf.flags = qc->tf.flags;
4955 ap->ops->qc_fill_rtf(qc);
4956 }
4957
4958 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4959 {
4960 struct ata_device *dev = qc->dev;
4961
4962 if (ata_tag_internal(qc->tag))
4963 return;
4964
4965 if (ata_is_nodata(qc->tf.protocol))
4966 return;
4967
4968 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4969 return;
4970
4971 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4972 }
4973
4974 /**
4975 * ata_qc_complete - Complete an active ATA command
4976 * @qc: Command to complete
4977 *
4978 * Indicate to the mid and upper layers that an ATA
4979 * command has completed, with either an ok or not-ok status.
4980 *
4981 * LOCKING:
4982 * spin_lock_irqsave(host lock)
4983 */
4984 void ata_qc_complete(struct ata_queued_cmd *qc)
4985 {
4986 struct ata_port *ap = qc->ap;
4987
4988 /* XXX: New EH and old EH use different mechanisms to
4989 * synchronize EH with regular execution path.
4990 *
4991 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4992 * Normal execution path is responsible for not accessing a
4993 * failed qc. libata core enforces the rule by returning NULL
4994 * from ata_qc_from_tag() for failed qcs.
4995 *
4996 * Old EH depends on ata_qc_complete() nullifying completion
4997 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4998 * not synchronize with interrupt handler. Only PIO task is
4999 * taken care of.
5000 */
5001 if (ap->ops->error_handler) {
5002 struct ata_device *dev = qc->dev;
5003 struct ata_eh_info *ehi = &dev->link->eh_info;
5004
5005 WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5006
5007 if (unlikely(qc->err_mask))
5008 qc->flags |= ATA_QCFLAG_FAILED;
5009
5010 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5011 /* always fill result TF for failed qc */
5012 fill_result_tf(qc);
5013
5014 if (!ata_tag_internal(qc->tag))
5015 ata_qc_schedule_eh(qc);
5016 else
5017 __ata_qc_complete(qc);
5018 return;
5019 }
5020
5021 /* read result TF if requested */
5022 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5023 fill_result_tf(qc);
5024
5025 /* Some commands need post-processing after successful
5026 * completion.
5027 */
5028 switch (qc->tf.command) {
5029 case ATA_CMD_SET_FEATURES:
5030 if (qc->tf.feature != SETFEATURES_WC_ON &&
5031 qc->tf.feature != SETFEATURES_WC_OFF)
5032 break;
5033 /* fall through */
5034 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5035 case ATA_CMD_SET_MULTI: /* multi_count changed */
5036 /* revalidate device */
5037 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5038 ata_port_schedule_eh(ap);
5039 break;
5040
5041 case ATA_CMD_SLEEP:
5042 dev->flags |= ATA_DFLAG_SLEEPING;
5043 break;
5044 }
5045
5046 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5047 ata_verify_xfer(qc);
5048
5049 __ata_qc_complete(qc);
5050 } else {
5051 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5052 return;
5053
5054 /* read result TF if failed or requested */
5055 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5056 fill_result_tf(qc);
5057
5058 __ata_qc_complete(qc);
5059 }
5060 }
5061
5062 /**
5063 * ata_qc_complete_multiple - Complete multiple qcs successfully
5064 * @ap: port in question
5065 * @qc_active: new qc_active mask
5066 *
5067 * Complete in-flight commands. This functions is meant to be
5068 * called from low-level driver's interrupt routine to complete
5069 * requests normally. ap->qc_active and @qc_active is compared
5070 * and commands are completed accordingly.
5071 *
5072 * LOCKING:
5073 * spin_lock_irqsave(host lock)
5074 *
5075 * RETURNS:
5076 * Number of completed commands on success, -errno otherwise.
5077 */
5078 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
5079 {
5080 int nr_done = 0;
5081 u32 done_mask;
5082
5083 done_mask = ap->qc_active ^ qc_active;
5084
5085 if (unlikely(done_mask & qc_active)) {
5086 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5087 "(%08x->%08x)\n", ap->qc_active, qc_active);
5088 return -EINVAL;
5089 }
5090
5091 while (done_mask) {
5092 struct ata_queued_cmd *qc;
5093 unsigned int tag = __ffs(done_mask);
5094
5095 qc = ata_qc_from_tag(ap, tag);
5096 if (qc) {
5097 ata_qc_complete(qc);
5098 nr_done++;
5099 }
5100 done_mask &= ~(1 << tag);
5101 }
5102
5103 return nr_done;
5104 }
5105
5106 /**
5107 * ata_qc_issue - issue taskfile to device
5108 * @qc: command to issue to device
5109 *
5110 * Prepare an ATA command to submission to device.
5111 * This includes mapping the data into a DMA-able
5112 * area, filling in the S/G table, and finally
5113 * writing the taskfile to hardware, starting the command.
5114 *
5115 * LOCKING:
5116 * spin_lock_irqsave(host lock)
5117 */
5118 void ata_qc_issue(struct ata_queued_cmd *qc)
5119 {
5120 struct ata_port *ap = qc->ap;
5121 struct ata_link *link = qc->dev->link;
5122 u8 prot = qc->tf.protocol;
5123
5124 /* Make sure only one non-NCQ command is outstanding. The
5125 * check is skipped for old EH because it reuses active qc to
5126 * request ATAPI sense.
5127 */
5128 WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5129
5130 if (ata_is_ncq(prot)) {
5131 WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5132
5133 if (!link->sactive)
5134 ap->nr_active_links++;
5135 link->sactive |= 1 << qc->tag;
5136 } else {
5137 WARN_ON_ONCE(link->sactive);
5138
5139 ap->nr_active_links++;
5140 link->active_tag = qc->tag;
5141 }
5142
5143 qc->flags |= ATA_QCFLAG_ACTIVE;
5144 ap->qc_active |= 1 << qc->tag;
5145
5146 /* We guarantee to LLDs that they will have at least one
5147 * non-zero sg if the command is a data command.
5148 */
5149 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5150
5151 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5152 (ap->flags & ATA_FLAG_PIO_DMA)))
5153 if (ata_sg_setup(qc))
5154 goto sg_err;
5155
5156 /* if device is sleeping, schedule reset and abort the link */
5157 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5158 link->eh_info.action |= ATA_EH_RESET;
5159 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5160 ata_link_abort(link);
5161 return;
5162 }
5163
5164 ap->ops->qc_prep(qc);
5165
5166 qc->err_mask |= ap->ops->qc_issue(qc);
5167 if (unlikely(qc->err_mask))
5168 goto err;
5169 return;
5170
5171 sg_err:
5172 qc->err_mask |= AC_ERR_SYSTEM;
5173 err:
5174 ata_qc_complete(qc);
5175 }
5176
5177 /**
5178 * sata_scr_valid - test whether SCRs are accessible
5179 * @link: ATA link to test SCR accessibility for
5180 *
5181 * Test whether SCRs are accessible for @link.
5182 *
5183 * LOCKING:
5184 * None.
5185 *
5186 * RETURNS:
5187 * 1 if SCRs are accessible, 0 otherwise.
5188 */
5189 int sata_scr_valid(struct ata_link *link)
5190 {
5191 struct ata_port *ap = link->ap;
5192
5193 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5194 }
5195
5196 /**
5197 * sata_scr_read - read SCR register of the specified port
5198 * @link: ATA link to read SCR for
5199 * @reg: SCR to read
5200 * @val: Place to store read value
5201 *
5202 * Read SCR register @reg of @link into *@val. This function is
5203 * guaranteed to succeed if @link is ap->link, the cable type of
5204 * the port is SATA and the port implements ->scr_read.
5205 *
5206 * LOCKING:
5207 * None if @link is ap->link. Kernel thread context otherwise.
5208 *
5209 * RETURNS:
5210 * 0 on success, negative errno on failure.
5211 */
5212 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5213 {
5214 if (ata_is_host_link(link)) {
5215 if (sata_scr_valid(link))
5216 return link->ap->ops->scr_read(link, reg, val);
5217 return -EOPNOTSUPP;
5218 }
5219
5220 return sata_pmp_scr_read(link, reg, val);
5221 }
5222
5223 /**
5224 * sata_scr_write - write SCR register of the specified port
5225 * @link: ATA link to write SCR for
5226 * @reg: SCR to write
5227 * @val: value to write
5228 *
5229 * Write @val to SCR register @reg of @link. This function is
5230 * guaranteed to succeed if @link is ap->link, the cable type of
5231 * the port is SATA and the port implements ->scr_read.
5232 *
5233 * LOCKING:
5234 * None if @link is ap->link. Kernel thread context otherwise.
5235 *
5236 * RETURNS:
5237 * 0 on success, negative errno on failure.
5238 */
5239 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5240 {
5241 if (ata_is_host_link(link)) {
5242 if (sata_scr_valid(link))
5243 return link->ap->ops->scr_write(link, reg, val);
5244 return -EOPNOTSUPP;
5245 }
5246
5247 return sata_pmp_scr_write(link, reg, val);
5248 }
5249
5250 /**
5251 * sata_scr_write_flush - write SCR register of the specified port and flush
5252 * @link: ATA link to write SCR for
5253 * @reg: SCR to write
5254 * @val: value to write
5255 *
5256 * This function is identical to sata_scr_write() except that this
5257 * function performs flush after writing to the register.
5258 *
5259 * LOCKING:
5260 * None if @link is ap->link. Kernel thread context otherwise.
5261 *
5262 * RETURNS:
5263 * 0 on success, negative errno on failure.
5264 */
5265 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5266 {
5267 if (ata_is_host_link(link)) {
5268 int rc;
5269
5270 if (sata_scr_valid(link)) {
5271 rc = link->ap->ops->scr_write(link, reg, val);
5272 if (rc == 0)
5273 rc = link->ap->ops->scr_read(link, reg, &val);
5274 return rc;
5275 }
5276 return -EOPNOTSUPP;
5277 }
5278
5279 return sata_pmp_scr_write(link, reg, val);
5280 }
5281
5282 /**
5283 * ata_phys_link_online - test whether the given link is online
5284 * @link: ATA link to test
5285 *
5286 * Test whether @link is online. Note that this function returns
5287 * 0 if online status of @link cannot be obtained, so
5288 * ata_link_online(link) != !ata_link_offline(link).
5289 *
5290 * LOCKING:
5291 * None.
5292 *
5293 * RETURNS:
5294 * True if the port online status is available and online.
5295 */
5296 bool ata_phys_link_online(struct ata_link *link)
5297 {
5298 u32 sstatus;
5299
5300 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5301 ata_sstatus_online(sstatus))
5302 return true;
5303 return false;
5304 }
5305
5306 /**
5307 * ata_phys_link_offline - test whether the given link is offline
5308 * @link: ATA link to test
5309 *
5310 * Test whether @link is offline. Note that this function
5311 * returns 0 if offline status of @link cannot be obtained, so
5312 * ata_link_online(link) != !ata_link_offline(link).
5313 *
5314 * LOCKING:
5315 * None.
5316 *
5317 * RETURNS:
5318 * True if the port offline status is available and offline.
5319 */
5320 bool ata_phys_link_offline(struct ata_link *link)
5321 {
5322 u32 sstatus;
5323
5324 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5325 !ata_sstatus_online(sstatus))
5326 return true;
5327 return false;
5328 }
5329
5330 /**
5331 * ata_link_online - test whether the given link is online
5332 * @link: ATA link to test
5333 *
5334 * Test whether @link is online. This is identical to
5335 * ata_phys_link_online() when there's no slave link. When
5336 * there's a slave link, this function should only be called on
5337 * the master link and will return true if any of M/S links is
5338 * online.
5339 *
5340 * LOCKING:
5341 * None.
5342 *
5343 * RETURNS:
5344 * True if the port online status is available and online.
5345 */
5346 bool ata_link_online(struct ata_link *link)
5347 {
5348 struct ata_link *slave = link->ap->slave_link;
5349
5350 WARN_ON(link == slave); /* shouldn't be called on slave link */
5351
5352 return ata_phys_link_online(link) ||
5353 (slave && ata_phys_link_online(slave));
5354 }
5355
5356 /**
5357 * ata_link_offline - test whether the given link is offline
5358 * @link: ATA link to test
5359 *
5360 * Test whether @link is offline. This is identical to
5361 * ata_phys_link_offline() when there's no slave link. When
5362 * there's a slave link, this function should only be called on
5363 * the master link and will return true if both M/S links are
5364 * offline.
5365 *
5366 * LOCKING:
5367 * None.
5368 *
5369 * RETURNS:
5370 * True if the port offline status is available and offline.
5371 */
5372 bool ata_link_offline(struct ata_link *link)
5373 {
5374 struct ata_link *slave = link->ap->slave_link;
5375
5376 WARN_ON(link == slave); /* shouldn't be called on slave link */
5377
5378 return ata_phys_link_offline(link) &&
5379 (!slave || ata_phys_link_offline(slave));
5380 }
5381
5382 #ifdef CONFIG_PM
5383 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5384 unsigned int action, unsigned int ehi_flags,
5385 int wait)
5386 {
5387 unsigned long flags;
5388 int i, rc;
5389
5390 for (i = 0; i < host->n_ports; i++) {
5391 struct ata_port *ap = host->ports[i];
5392 struct ata_link *link;
5393
5394 /* Previous resume operation might still be in
5395 * progress. Wait for PM_PENDING to clear.
5396 */
5397 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5398 ata_port_wait_eh(ap);
5399 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5400 }
5401
5402 /* request PM ops to EH */
5403 spin_lock_irqsave(ap->lock, flags);
5404
5405 ap->pm_mesg = mesg;
5406 if (wait) {
5407 rc = 0;
5408 ap->pm_result = &rc;
5409 }
5410
5411 ap->pflags |= ATA_PFLAG_PM_PENDING;
5412 ata_for_each_link(link, ap, HOST_FIRST) {
5413 link->eh_info.action |= action;
5414 link->eh_info.flags |= ehi_flags;
5415 }
5416
5417 ata_port_schedule_eh(ap);
5418
5419 spin_unlock_irqrestore(ap->lock, flags);
5420
5421 /* wait and check result */
5422 if (wait) {
5423 ata_port_wait_eh(ap);
5424 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5425 if (rc)
5426 return rc;
5427 }
5428 }
5429
5430 return 0;
5431 }
5432
5433 /**
5434 * ata_host_suspend - suspend host
5435 * @host: host to suspend
5436 * @mesg: PM message
5437 *
5438 * Suspend @host. Actual operation is performed by EH. This
5439 * function requests EH to perform PM operations and waits for EH
5440 * to finish.
5441 *
5442 * LOCKING:
5443 * Kernel thread context (may sleep).
5444 *
5445 * RETURNS:
5446 * 0 on success, -errno on failure.
5447 */
5448 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5449 {
5450 int rc;
5451
5452 /*
5453 * disable link pm on all ports before requesting
5454 * any pm activity
5455 */
5456 ata_lpm_enable(host);
5457
5458 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5459 if (rc == 0)
5460 host->dev->power.power_state = mesg;
5461 return rc;
5462 }
5463
5464 /**
5465 * ata_host_resume - resume host
5466 * @host: host to resume
5467 *
5468 * Resume @host. Actual operation is performed by EH. This
5469 * function requests EH to perform PM operations and returns.
5470 * Note that all resume operations are performed parallely.
5471 *
5472 * LOCKING:
5473 * Kernel thread context (may sleep).
5474 */
5475 void ata_host_resume(struct ata_host *host)
5476 {
5477 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
5478 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5479 host->dev->power.power_state = PMSG_ON;
5480
5481 /* reenable link pm */
5482 ata_lpm_disable(host);
5483 }
5484 #endif
5485
5486 /**
5487 * ata_port_start - Set port up for dma.
5488 * @ap: Port to initialize
5489 *
5490 * Called just after data structures for each port are
5491 * initialized. Allocates space for PRD table.
5492 *
5493 * May be used as the port_start() entry in ata_port_operations.
5494 *
5495 * LOCKING:
5496 * Inherited from caller.
5497 */
5498 int ata_port_start(struct ata_port *ap)
5499 {
5500 struct device *dev = ap->dev;
5501
5502 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5503 GFP_KERNEL);
5504 if (!ap->prd)
5505 return -ENOMEM;
5506
5507 return 0;
5508 }
5509
5510 /**
5511 * ata_dev_init - Initialize an ata_device structure
5512 * @dev: Device structure to initialize
5513 *
5514 * Initialize @dev in preparation for probing.
5515 *
5516 * LOCKING:
5517 * Inherited from caller.
5518 */
5519 void ata_dev_init(struct ata_device *dev)
5520 {
5521 struct ata_link *link = ata_dev_phys_link(dev);
5522 struct ata_port *ap = link->ap;
5523 unsigned long flags;
5524
5525 /* SATA spd limit is bound to the attached device, reset together */
5526 link->sata_spd_limit = link->hw_sata_spd_limit;
5527 link->sata_spd = 0;
5528
5529 /* High bits of dev->flags are used to record warm plug
5530 * requests which occur asynchronously. Synchronize using
5531 * host lock.
5532 */
5533 spin_lock_irqsave(ap->lock, flags);
5534 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5535 dev->horkage = 0;
5536 spin_unlock_irqrestore(ap->lock, flags);
5537
5538 memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5539 ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5540 dev->pio_mask = UINT_MAX;
5541 dev->mwdma_mask = UINT_MAX;
5542 dev->udma_mask = UINT_MAX;
5543 }
5544
5545 /**
5546 * ata_link_init - Initialize an ata_link structure
5547 * @ap: ATA port link is attached to
5548 * @link: Link structure to initialize
5549 * @pmp: Port multiplier port number
5550 *
5551 * Initialize @link.
5552 *
5553 * LOCKING:
5554 * Kernel thread context (may sleep)
5555 */
5556 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5557 {
5558 int i;
5559
5560 /* clear everything except for devices */
5561 memset(link, 0, offsetof(struct ata_link, device[0]));
5562
5563 link->ap = ap;
5564 link->pmp = pmp;
5565 link->active_tag = ATA_TAG_POISON;
5566 link->hw_sata_spd_limit = UINT_MAX;
5567
5568 /* can't use iterator, ap isn't initialized yet */
5569 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5570 struct ata_device *dev = &link->device[i];
5571
5572 dev->link = link;
5573 dev->devno = dev - link->device;
5574 ata_dev_init(dev);
5575 }
5576 }
5577
5578 /**
5579 * sata_link_init_spd - Initialize link->sata_spd_limit
5580 * @link: Link to configure sata_spd_limit for
5581 *
5582 * Initialize @link->[hw_]sata_spd_limit to the currently
5583 * configured value.
5584 *
5585 * LOCKING:
5586 * Kernel thread context (may sleep).
5587 *
5588 * RETURNS:
5589 * 0 on success, -errno on failure.
5590 */
5591 int sata_link_init_spd(struct ata_link *link)
5592 {
5593 u8 spd;
5594 int rc;
5595
5596 rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5597 if (rc)
5598 return rc;
5599
5600 spd = (link->saved_scontrol >> 4) & 0xf;
5601 if (spd)
5602 link->hw_sata_spd_limit &= (1 << spd) - 1;
5603
5604 ata_force_link_limits(link);
5605
5606 link->sata_spd_limit = link->hw_sata_spd_limit;
5607
5608 return 0;
5609 }
5610
5611 /**
5612 * ata_port_alloc - allocate and initialize basic ATA port resources
5613 * @host: ATA host this allocated port belongs to
5614 *
5615 * Allocate and initialize basic ATA port resources.
5616 *
5617 * RETURNS:
5618 * Allocate ATA port on success, NULL on failure.
5619 *
5620 * LOCKING:
5621 * Inherited from calling layer (may sleep).
5622 */
5623 struct ata_port *ata_port_alloc(struct ata_host *host)
5624 {
5625 struct ata_port *ap;
5626
5627 DPRINTK("ENTER\n");
5628
5629 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5630 if (!ap)
5631 return NULL;
5632
5633 ap->pflags |= ATA_PFLAG_INITIALIZING;
5634 ap->lock = &host->lock;
5635 ap->flags = ATA_FLAG_DISABLED;
5636 ap->print_id = -1;
5637 ap->ctl = ATA_DEVCTL_OBS;
5638 ap->host = host;
5639 ap->dev = host->dev;
5640 ap->last_ctl = 0xFF;
5641
5642 #if defined(ATA_VERBOSE_DEBUG)
5643 /* turn on all debugging levels */
5644 ap->msg_enable = 0x00FF;
5645 #elif defined(ATA_DEBUG)
5646 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5647 #else
5648 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5649 #endif
5650
5651 #ifdef CONFIG_ATA_SFF
5652 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5653 #else
5654 INIT_DELAYED_WORK(&ap->port_task, NULL);
5655 #endif
5656 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5657 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5658 INIT_LIST_HEAD(&ap->eh_done_q);
5659 init_waitqueue_head(&ap->eh_wait_q);
5660 init_completion(&ap->park_req_pending);
5661 init_timer_deferrable(&ap->fastdrain_timer);
5662 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5663 ap->fastdrain_timer.data = (unsigned long)ap;
5664
5665 ap->cbl = ATA_CBL_NONE;
5666
5667 ata_link_init(ap, &ap->link, 0);
5668
5669 #ifdef ATA_IRQ_TRAP
5670 ap->stats.unhandled_irq = 1;
5671 ap->stats.idle_irq = 1;
5672 #endif
5673 return ap;
5674 }
5675
5676 static void ata_host_release(struct device *gendev, void *res)
5677 {
5678 struct ata_host *host = dev_get_drvdata(gendev);
5679 int i;
5680
5681 for (i = 0; i < host->n_ports; i++) {
5682 struct ata_port *ap = host->ports[i];
5683
5684 if (!ap)
5685 continue;
5686
5687 if (ap->scsi_host)
5688 scsi_host_put(ap->scsi_host);
5689
5690 kfree(ap->pmp_link);
5691 kfree(ap->slave_link);
5692 kfree(ap);
5693 host->ports[i] = NULL;
5694 }
5695
5696 dev_set_drvdata(gendev, NULL);
5697 }
5698
5699 /**
5700 * ata_host_alloc - allocate and init basic ATA host resources
5701 * @dev: generic device this host is associated with
5702 * @max_ports: maximum number of ATA ports associated with this host
5703 *
5704 * Allocate and initialize basic ATA host resources. LLD calls
5705 * this function to allocate a host, initializes it fully and
5706 * attaches it using ata_host_register().
5707 *
5708 * @max_ports ports are allocated and host->n_ports is
5709 * initialized to @max_ports. The caller is allowed to decrease
5710 * host->n_ports before calling ata_host_register(). The unused
5711 * ports will be automatically freed on registration.
5712 *
5713 * RETURNS:
5714 * Allocate ATA host on success, NULL on failure.
5715 *
5716 * LOCKING:
5717 * Inherited from calling layer (may sleep).
5718 */
5719 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5720 {
5721 struct ata_host *host;
5722 size_t sz;
5723 int i;
5724
5725 DPRINTK("ENTER\n");
5726
5727 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5728 return NULL;
5729
5730 /* alloc a container for our list of ATA ports (buses) */
5731 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5732 /* alloc a container for our list of ATA ports (buses) */
5733 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5734 if (!host)
5735 goto err_out;
5736
5737 devres_add(dev, host);
5738 dev_set_drvdata(dev, host);
5739
5740 spin_lock_init(&host->lock);
5741 host->dev = dev;
5742 host->n_ports = max_ports;
5743
5744 /* allocate ports bound to this host */
5745 for (i = 0; i < max_ports; i++) {
5746 struct ata_port *ap;
5747
5748 ap = ata_port_alloc(host);
5749 if (!ap)
5750 goto err_out;
5751
5752 ap->port_no = i;
5753 host->ports[i] = ap;
5754 }
5755
5756 devres_remove_group(dev, NULL);
5757 return host;
5758
5759 err_out:
5760 devres_release_group(dev, NULL);
5761 return NULL;
5762 }
5763
5764 /**
5765 * ata_host_alloc_pinfo - alloc host and init with port_info array
5766 * @dev: generic device this host is associated with
5767 * @ppi: array of ATA port_info to initialize host with
5768 * @n_ports: number of ATA ports attached to this host
5769 *
5770 * Allocate ATA host and initialize with info from @ppi. If NULL
5771 * terminated, @ppi may contain fewer entries than @n_ports. The
5772 * last entry will be used for the remaining ports.
5773 *
5774 * RETURNS:
5775 * Allocate ATA host on success, NULL on failure.
5776 *
5777 * LOCKING:
5778 * Inherited from calling layer (may sleep).
5779 */
5780 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5781 const struct ata_port_info * const * ppi,
5782 int n_ports)
5783 {
5784 const struct ata_port_info *pi;
5785 struct ata_host *host;
5786 int i, j;
5787
5788 host = ata_host_alloc(dev, n_ports);
5789 if (!host)
5790 return NULL;
5791
5792 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5793 struct ata_port *ap = host->ports[i];
5794
5795 if (ppi[j])
5796 pi = ppi[j++];
5797
5798 ap->pio_mask = pi->pio_mask;
5799 ap->mwdma_mask = pi->mwdma_mask;
5800 ap->udma_mask = pi->udma_mask;
5801 ap->flags |= pi->flags;
5802 ap->link.flags |= pi->link_flags;
5803 ap->ops = pi->port_ops;
5804
5805 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5806 host->ops = pi->port_ops;
5807 }
5808
5809 return host;
5810 }
5811
5812 /**
5813 * ata_slave_link_init - initialize slave link
5814 * @ap: port to initialize slave link for
5815 *
5816 * Create and initialize slave link for @ap. This enables slave
5817 * link handling on the port.
5818 *
5819 * In libata, a port contains links and a link contains devices.
5820 * There is single host link but if a PMP is attached to it,
5821 * there can be multiple fan-out links. On SATA, there's usually
5822 * a single device connected to a link but PATA and SATA
5823 * controllers emulating TF based interface can have two - master
5824 * and slave.
5825 *
5826 * However, there are a few controllers which don't fit into this
5827 * abstraction too well - SATA controllers which emulate TF
5828 * interface with both master and slave devices but also have
5829 * separate SCR register sets for each device. These controllers
5830 * need separate links for physical link handling
5831 * (e.g. onlineness, link speed) but should be treated like a
5832 * traditional M/S controller for everything else (e.g. command
5833 * issue, softreset).
5834 *
5835 * slave_link is libata's way of handling this class of
5836 * controllers without impacting core layer too much. For
5837 * anything other than physical link handling, the default host
5838 * link is used for both master and slave. For physical link
5839 * handling, separate @ap->slave_link is used. All dirty details
5840 * are implemented inside libata core layer. From LLD's POV, the
5841 * only difference is that prereset, hardreset and postreset are
5842 * called once more for the slave link, so the reset sequence
5843 * looks like the following.
5844 *
5845 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
5846 * softreset(M) -> postreset(M) -> postreset(S)
5847 *
5848 * Note that softreset is called only for the master. Softreset
5849 * resets both M/S by definition, so SRST on master should handle
5850 * both (the standard method will work just fine).
5851 *
5852 * LOCKING:
5853 * Should be called before host is registered.
5854 *
5855 * RETURNS:
5856 * 0 on success, -errno on failure.
5857 */
5858 int ata_slave_link_init(struct ata_port *ap)
5859 {
5860 struct ata_link *link;
5861
5862 WARN_ON(ap->slave_link);
5863 WARN_ON(ap->flags & ATA_FLAG_PMP);
5864
5865 link = kzalloc(sizeof(*link), GFP_KERNEL);
5866 if (!link)
5867 return -ENOMEM;
5868
5869 ata_link_init(ap, link, 1);
5870 ap->slave_link = link;
5871 return 0;
5872 }
5873
5874 static void ata_host_stop(struct device *gendev, void *res)
5875 {
5876 struct ata_host *host = dev_get_drvdata(gendev);
5877 int i;
5878
5879 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5880
5881 for (i = 0; i < host->n_ports; i++) {
5882 struct ata_port *ap = host->ports[i];
5883
5884 if (ap->ops->port_stop)
5885 ap->ops->port_stop(ap);
5886 }
5887
5888 if (host->ops->host_stop)
5889 host->ops->host_stop(host);
5890 }
5891
5892 /**
5893 * ata_finalize_port_ops - finalize ata_port_operations
5894 * @ops: ata_port_operations to finalize
5895 *
5896 * An ata_port_operations can inherit from another ops and that
5897 * ops can again inherit from another. This can go on as many
5898 * times as necessary as long as there is no loop in the
5899 * inheritance chain.
5900 *
5901 * Ops tables are finalized when the host is started. NULL or
5902 * unspecified entries are inherited from the closet ancestor
5903 * which has the method and the entry is populated with it.
5904 * After finalization, the ops table directly points to all the
5905 * methods and ->inherits is no longer necessary and cleared.
5906 *
5907 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5908 *
5909 * LOCKING:
5910 * None.
5911 */
5912 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5913 {
5914 static DEFINE_SPINLOCK(lock);
5915 const struct ata_port_operations *cur;
5916 void **begin = (void **)ops;
5917 void **end = (void **)&ops->inherits;
5918 void **pp;
5919
5920 if (!ops || !ops->inherits)
5921 return;
5922
5923 spin_lock(&lock);
5924
5925 for (cur = ops->inherits; cur; cur = cur->inherits) {
5926 void **inherit = (void **)cur;
5927
5928 for (pp = begin; pp < end; pp++, inherit++)
5929 if (!*pp)
5930 *pp = *inherit;
5931 }
5932
5933 for (pp = begin; pp < end; pp++)
5934 if (IS_ERR(*pp))
5935 *pp = NULL;
5936
5937 ops->inherits = NULL;
5938
5939 spin_unlock(&lock);
5940 }
5941
5942 /**
5943 * ata_host_start - start and freeze ports of an ATA host
5944 * @host: ATA host to start ports for
5945 *
5946 * Start and then freeze ports of @host. Started status is
5947 * recorded in host->flags, so this function can be called
5948 * multiple times. Ports are guaranteed to get started only
5949 * once. If host->ops isn't initialized yet, its set to the
5950 * first non-dummy port ops.
5951 *
5952 * LOCKING:
5953 * Inherited from calling layer (may sleep).
5954 *
5955 * RETURNS:
5956 * 0 if all ports are started successfully, -errno otherwise.
5957 */
5958 int ata_host_start(struct ata_host *host)
5959 {
5960 int have_stop = 0;
5961 void *start_dr = NULL;
5962 int i, rc;
5963
5964 if (host->flags & ATA_HOST_STARTED)
5965 return 0;
5966
5967 ata_finalize_port_ops(host->ops);
5968
5969 for (i = 0; i < host->n_ports; i++) {
5970 struct ata_port *ap = host->ports[i];
5971
5972 ata_finalize_port_ops(ap->ops);
5973
5974 if (!host->ops && !ata_port_is_dummy(ap))
5975 host->ops = ap->ops;
5976
5977 if (ap->ops->port_stop)
5978 have_stop = 1;
5979 }
5980
5981 if (host->ops->host_stop)
5982 have_stop = 1;
5983
5984 if (have_stop) {
5985 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5986 if (!start_dr)
5987 return -ENOMEM;
5988 }
5989
5990 for (i = 0; i < host->n_ports; i++) {
5991 struct ata_port *ap = host->ports[i];
5992
5993 if (ap->ops->port_start) {
5994 rc = ap->ops->port_start(ap);
5995 if (rc) {
5996 if (rc != -ENODEV)
5997 dev_printk(KERN_ERR, host->dev,
5998 "failed to start port %d "
5999 "(errno=%d)\n", i, rc);
6000 goto err_out;
6001 }
6002 }
6003 ata_eh_freeze_port(ap);
6004 }
6005
6006 if (start_dr)
6007 devres_add(host->dev, start_dr);
6008 host->flags |= ATA_HOST_STARTED;
6009 return 0;
6010
6011 err_out:
6012 while (--i >= 0) {
6013 struct ata_port *ap = host->ports[i];
6014
6015 if (ap->ops->port_stop)
6016 ap->ops->port_stop(ap);
6017 }
6018 devres_free(start_dr);
6019 return rc;
6020 }
6021
6022 /**
6023 * ata_sas_host_init - Initialize a host struct
6024 * @host: host to initialize
6025 * @dev: device host is attached to
6026 * @flags: host flags
6027 * @ops: port_ops
6028 *
6029 * LOCKING:
6030 * PCI/etc. bus probe sem.
6031 *
6032 */
6033 /* KILLME - the only user left is ipr */
6034 void ata_host_init(struct ata_host *host, struct device *dev,
6035 unsigned long flags, struct ata_port_operations *ops)
6036 {
6037 spin_lock_init(&host->lock);
6038 host->dev = dev;
6039 host->flags = flags;
6040 host->ops = ops;
6041 }
6042
6043
6044 static void async_port_probe(void *data, async_cookie_t cookie)
6045 {
6046 int rc;
6047 struct ata_port *ap = data;
6048
6049 /*
6050 * If we're not allowed to scan this host in parallel,
6051 * we need to wait until all previous scans have completed
6052 * before going further.
6053 * Jeff Garzik says this is only within a controller, so we
6054 * don't need to wait for port 0, only for later ports.
6055 */
6056 if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6057 async_synchronize_cookie(cookie);
6058
6059 /* probe */
6060 if (ap->ops->error_handler) {
6061 struct ata_eh_info *ehi = &ap->link.eh_info;
6062 unsigned long flags;
6063
6064 ata_port_probe(ap);
6065
6066 /* kick EH for boot probing */
6067 spin_lock_irqsave(ap->lock, flags);
6068
6069 ehi->probe_mask |= ATA_ALL_DEVICES;
6070 ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
6071 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6072
6073 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6074 ap->pflags |= ATA_PFLAG_LOADING;
6075 ata_port_schedule_eh(ap);
6076
6077 spin_unlock_irqrestore(ap->lock, flags);
6078
6079 /* wait for EH to finish */
6080 ata_port_wait_eh(ap);
6081 } else {
6082 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6083 rc = ata_bus_probe(ap);
6084 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6085
6086 if (rc) {
6087 /* FIXME: do something useful here?
6088 * Current libata behavior will
6089 * tear down everything when
6090 * the module is removed
6091 * or the h/w is unplugged.
6092 */
6093 }
6094 }
6095
6096 /* in order to keep device order, we need to synchronize at this point */
6097 async_synchronize_cookie(cookie);
6098
6099 ata_scsi_scan_host(ap, 1);
6100
6101 }
6102 /**
6103 * ata_host_register - register initialized ATA host
6104 * @host: ATA host to register
6105 * @sht: template for SCSI host
6106 *
6107 * Register initialized ATA host. @host is allocated using
6108 * ata_host_alloc() and fully initialized by LLD. This function
6109 * starts ports, registers @host with ATA and SCSI layers and
6110 * probe registered devices.
6111 *
6112 * LOCKING:
6113 * Inherited from calling layer (may sleep).
6114 *
6115 * RETURNS:
6116 * 0 on success, -errno otherwise.
6117 */
6118 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6119 {
6120 int i, rc;
6121
6122 /* host must have been started */
6123 if (!(host->flags & ATA_HOST_STARTED)) {
6124 dev_printk(KERN_ERR, host->dev,
6125 "BUG: trying to register unstarted host\n");
6126 WARN_ON(1);
6127 return -EINVAL;
6128 }
6129
6130 /* Blow away unused ports. This happens when LLD can't
6131 * determine the exact number of ports to allocate at
6132 * allocation time.
6133 */
6134 for (i = host->n_ports; host->ports[i]; i++)
6135 kfree(host->ports[i]);
6136
6137 /* give ports names and add SCSI hosts */
6138 for (i = 0; i < host->n_ports; i++)
6139 host->ports[i]->print_id = ata_print_id++;
6140
6141 rc = ata_scsi_add_hosts(host, sht);
6142 if (rc)
6143 return rc;
6144
6145 /* associate with ACPI nodes */
6146 ata_acpi_associate(host);
6147
6148 /* set cable, sata_spd_limit and report */
6149 for (i = 0; i < host->n_ports; i++) {
6150 struct ata_port *ap = host->ports[i];
6151 unsigned long xfer_mask;
6152
6153 /* set SATA cable type if still unset */
6154 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6155 ap->cbl = ATA_CBL_SATA;
6156
6157 /* init sata_spd_limit to the current value */
6158 sata_link_init_spd(&ap->link);
6159 if (ap->slave_link)
6160 sata_link_init_spd(ap->slave_link);
6161
6162 /* print per-port info to dmesg */
6163 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6164 ap->udma_mask);
6165
6166 if (!ata_port_is_dummy(ap)) {
6167 ata_port_printk(ap, KERN_INFO,
6168 "%cATA max %s %s\n",
6169 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6170 ata_mode_string(xfer_mask),
6171 ap->link.eh_info.desc);
6172 ata_ehi_clear_desc(&ap->link.eh_info);
6173 } else
6174 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
6175 }
6176
6177 /* perform each probe asynchronously */
6178 for (i = 0; i < host->n_ports; i++) {
6179 struct ata_port *ap = host->ports[i];
6180 async_schedule(async_port_probe, ap);
6181 }
6182
6183 return 0;
6184 }
6185
6186 /**
6187 * ata_host_activate - start host, request IRQ and register it
6188 * @host: target ATA host
6189 * @irq: IRQ to request
6190 * @irq_handler: irq_handler used when requesting IRQ
6191 * @irq_flags: irq_flags used when requesting IRQ
6192 * @sht: scsi_host_template to use when registering the host
6193 *
6194 * After allocating an ATA host and initializing it, most libata
6195 * LLDs perform three steps to activate the host - start host,
6196 * request IRQ and register it. This helper takes necessasry
6197 * arguments and performs the three steps in one go.
6198 *
6199 * An invalid IRQ skips the IRQ registration and expects the host to
6200 * have set polling mode on the port. In this case, @irq_handler
6201 * should be NULL.
6202 *
6203 * LOCKING:
6204 * Inherited from calling layer (may sleep).
6205 *
6206 * RETURNS:
6207 * 0 on success, -errno otherwise.
6208 */
6209 int ata_host_activate(struct ata_host *host, int irq,
6210 irq_handler_t irq_handler, unsigned long irq_flags,
6211 struct scsi_host_template *sht)
6212 {
6213 int i, rc;
6214
6215 rc = ata_host_start(host);
6216 if (rc)
6217 return rc;
6218
6219 /* Special case for polling mode */
6220 if (!irq) {
6221 WARN_ON(irq_handler);
6222 return ata_host_register(host, sht);
6223 }
6224
6225 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6226 dev_driver_string(host->dev), host);
6227 if (rc)
6228 return rc;
6229
6230 for (i = 0; i < host->n_ports; i++)
6231 ata_port_desc(host->ports[i], "irq %d", irq);
6232
6233 rc = ata_host_register(host, sht);
6234 /* if failed, just free the IRQ and leave ports alone */
6235 if (rc)
6236 devm_free_irq(host->dev, irq, host);
6237
6238 return rc;
6239 }
6240
6241 /**
6242 * ata_port_detach - Detach ATA port in prepration of device removal
6243 * @ap: ATA port to be detached
6244 *
6245 * Detach all ATA devices and the associated SCSI devices of @ap;
6246 * then, remove the associated SCSI host. @ap is guaranteed to
6247 * be quiescent on return from this function.
6248 *
6249 * LOCKING:
6250 * Kernel thread context (may sleep).
6251 */
6252 static void ata_port_detach(struct ata_port *ap)
6253 {
6254 unsigned long flags;
6255
6256 if (!ap->ops->error_handler)
6257 goto skip_eh;
6258
6259 /* tell EH we're leaving & flush EH */
6260 spin_lock_irqsave(ap->lock, flags);
6261 ap->pflags |= ATA_PFLAG_UNLOADING;
6262 ata_port_schedule_eh(ap);
6263 spin_unlock_irqrestore(ap->lock, flags);
6264
6265 /* wait till EH commits suicide */
6266 ata_port_wait_eh(ap);
6267
6268 /* it better be dead now */
6269 WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6270
6271 cancel_rearming_delayed_work(&ap->hotplug_task);
6272
6273 skip_eh:
6274 /* remove the associated SCSI host */
6275 scsi_remove_host(ap->scsi_host);
6276 }
6277
6278 /**
6279 * ata_host_detach - Detach all ports of an ATA host
6280 * @host: Host to detach
6281 *
6282 * Detach all ports of @host.
6283 *
6284 * LOCKING:
6285 * Kernel thread context (may sleep).
6286 */
6287 void ata_host_detach(struct ata_host *host)
6288 {
6289 int i;
6290
6291 for (i = 0; i < host->n_ports; i++)
6292 ata_port_detach(host->ports[i]);
6293
6294 /* the host is dead now, dissociate ACPI */
6295 ata_acpi_dissociate(host);
6296 }
6297
6298 #ifdef CONFIG_PCI
6299
6300 /**
6301 * ata_pci_remove_one - PCI layer callback for device removal
6302 * @pdev: PCI device that was removed
6303 *
6304 * PCI layer indicates to libata via this hook that hot-unplug or
6305 * module unload event has occurred. Detach all ports. Resource
6306 * release is handled via devres.
6307 *
6308 * LOCKING:
6309 * Inherited from PCI layer (may sleep).
6310 */
6311 void ata_pci_remove_one(struct pci_dev *pdev)
6312 {
6313 struct device *dev = &pdev->dev;
6314 struct ata_host *host = dev_get_drvdata(dev);
6315
6316 ata_host_detach(host);
6317 }
6318
6319 /* move to PCI subsystem */
6320 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6321 {
6322 unsigned long tmp = 0;
6323
6324 switch (bits->width) {
6325 case 1: {
6326 u8 tmp8 = 0;
6327 pci_read_config_byte(pdev, bits->reg, &tmp8);
6328 tmp = tmp8;
6329 break;
6330 }
6331 case 2: {
6332 u16 tmp16 = 0;
6333 pci_read_config_word(pdev, bits->reg, &tmp16);
6334 tmp = tmp16;
6335 break;
6336 }
6337 case 4: {
6338 u32 tmp32 = 0;
6339 pci_read_config_dword(pdev, bits->reg, &tmp32);
6340 tmp = tmp32;
6341 break;
6342 }
6343
6344 default:
6345 return -EINVAL;
6346 }
6347
6348 tmp &= bits->mask;
6349
6350 return (tmp == bits->val) ? 1 : 0;
6351 }
6352
6353 #ifdef CONFIG_PM
6354 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6355 {
6356 pci_save_state(pdev);
6357 pci_disable_device(pdev);
6358
6359 if (mesg.event & PM_EVENT_SLEEP)
6360 pci_set_power_state(pdev, PCI_D3hot);
6361 }
6362
6363 int ata_pci_device_do_resume(struct pci_dev *pdev)
6364 {
6365 int rc;
6366
6367 pci_set_power_state(pdev, PCI_D0);
6368 pci_restore_state(pdev);
6369
6370 rc = pcim_enable_device(pdev);
6371 if (rc) {
6372 dev_printk(KERN_ERR, &pdev->dev,
6373 "failed to enable device after resume (%d)\n", rc);
6374 return rc;
6375 }
6376
6377 pci_set_master(pdev);
6378 return 0;
6379 }
6380
6381 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6382 {
6383 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6384 int rc = 0;
6385
6386 rc = ata_host_suspend(host, mesg);
6387 if (rc)
6388 return rc;
6389
6390 ata_pci_device_do_suspend(pdev, mesg);
6391
6392 return 0;
6393 }
6394
6395 int ata_pci_device_resume(struct pci_dev *pdev)
6396 {
6397 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6398 int rc;
6399
6400 rc = ata_pci_device_do_resume(pdev);
6401 if (rc == 0)
6402 ata_host_resume(host);
6403 return rc;
6404 }
6405 #endif /* CONFIG_PM */
6406
6407 #endif /* CONFIG_PCI */
6408
6409 static int __init ata_parse_force_one(char **cur,
6410 struct ata_force_ent *force_ent,
6411 const char **reason)
6412 {
6413 /* FIXME: Currently, there's no way to tag init const data and
6414 * using __initdata causes build failure on some versions of
6415 * gcc. Once __initdataconst is implemented, add const to the
6416 * following structure.
6417 */
6418 static struct ata_force_param force_tbl[] __initdata = {
6419 { "40c", .cbl = ATA_CBL_PATA40 },
6420 { "80c", .cbl = ATA_CBL_PATA80 },
6421 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
6422 { "unk", .cbl = ATA_CBL_PATA_UNK },
6423 { "ign", .cbl = ATA_CBL_PATA_IGN },
6424 { "sata", .cbl = ATA_CBL_SATA },
6425 { "1.5Gbps", .spd_limit = 1 },
6426 { "3.0Gbps", .spd_limit = 2 },
6427 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
6428 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
6429 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
6430 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
6431 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
6432 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
6433 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
6434 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
6435 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
6436 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
6437 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
6438 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
6439 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
6440 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
6441 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6442 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6443 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6444 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6445 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6446 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6447 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6448 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6449 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6450 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6451 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6452 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6453 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6454 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6455 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6456 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6457 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6458 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6459 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6460 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6461 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6462 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
6463 { "nohrst", .lflags = ATA_LFLAG_NO_HRST },
6464 { "nosrst", .lflags = ATA_LFLAG_NO_SRST },
6465 { "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6466 };
6467 char *start = *cur, *p = *cur;
6468 char *id, *val, *endp;
6469 const struct ata_force_param *match_fp = NULL;
6470 int nr_matches = 0, i;
6471
6472 /* find where this param ends and update *cur */
6473 while (*p != '\0' && *p != ',')
6474 p++;
6475
6476 if (*p == '\0')
6477 *cur = p;
6478 else
6479 *cur = p + 1;
6480
6481 *p = '\0';
6482
6483 /* parse */
6484 p = strchr(start, ':');
6485 if (!p) {
6486 val = strstrip(start);
6487 goto parse_val;
6488 }
6489 *p = '\0';
6490
6491 id = strstrip(start);
6492 val = strstrip(p + 1);
6493
6494 /* parse id */
6495 p = strchr(id, '.');
6496 if (p) {
6497 *p++ = '\0';
6498 force_ent->device = simple_strtoul(p, &endp, 10);
6499 if (p == endp || *endp != '\0') {
6500 *reason = "invalid device";
6501 return -EINVAL;
6502 }
6503 }
6504
6505 force_ent->port = simple_strtoul(id, &endp, 10);
6506 if (p == endp || *endp != '\0') {
6507 *reason = "invalid port/link";
6508 return -EINVAL;
6509 }
6510
6511 parse_val:
6512 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
6513 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
6514 const struct ata_force_param *fp = &force_tbl[i];
6515
6516 if (strncasecmp(val, fp->name, strlen(val)))
6517 continue;
6518
6519 nr_matches++;
6520 match_fp = fp;
6521
6522 if (strcasecmp(val, fp->name) == 0) {
6523 nr_matches = 1;
6524 break;
6525 }
6526 }
6527
6528 if (!nr_matches) {
6529 *reason = "unknown value";
6530 return -EINVAL;
6531 }
6532 if (nr_matches > 1) {
6533 *reason = "ambigious value";
6534 return -EINVAL;
6535 }
6536
6537 force_ent->param = *match_fp;
6538
6539 return 0;
6540 }
6541
6542 static void __init ata_parse_force_param(void)
6543 {
6544 int idx = 0, size = 1;
6545 int last_port = -1, last_device = -1;
6546 char *p, *cur, *next;
6547
6548 /* calculate maximum number of params and allocate force_tbl */
6549 for (p = ata_force_param_buf; *p; p++)
6550 if (*p == ',')
6551 size++;
6552
6553 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
6554 if (!ata_force_tbl) {
6555 printk(KERN_WARNING "ata: failed to extend force table, "
6556 "libata.force ignored\n");
6557 return;
6558 }
6559
6560 /* parse and populate the table */
6561 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6562 const char *reason = "";
6563 struct ata_force_ent te = { .port = -1, .device = -1 };
6564
6565 next = cur;
6566 if (ata_parse_force_one(&next, &te, &reason)) {
6567 printk(KERN_WARNING "ata: failed to parse force "
6568 "parameter \"%s\" (%s)\n",
6569 cur, reason);
6570 continue;
6571 }
6572
6573 if (te.port == -1) {
6574 te.port = last_port;
6575 te.device = last_device;
6576 }
6577
6578 ata_force_tbl[idx++] = te;
6579
6580 last_port = te.port;
6581 last_device = te.device;
6582 }
6583
6584 ata_force_tbl_size = idx;
6585 }
6586
6587 static int __init ata_init(void)
6588 {
6589 ata_parse_force_param();
6590
6591 ata_wq = create_workqueue("ata");
6592 if (!ata_wq)
6593 goto free_force_tbl;
6594
6595 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6596 if (!ata_aux_wq)
6597 goto free_wq;
6598
6599 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6600 return 0;
6601
6602 free_wq:
6603 destroy_workqueue(ata_wq);
6604 free_force_tbl:
6605 kfree(ata_force_tbl);
6606 return -ENOMEM;
6607 }
6608
6609 static void __exit ata_exit(void)
6610 {
6611 kfree(ata_force_tbl);
6612 destroy_workqueue(ata_wq);
6613 destroy_workqueue(ata_aux_wq);
6614 }
6615
6616 subsys_initcall(ata_init);
6617 module_exit(ata_exit);
6618
6619 static unsigned long ratelimit_time;
6620 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6621
6622 int ata_ratelimit(void)
6623 {
6624 int rc;
6625 unsigned long flags;
6626
6627 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6628
6629 if (time_after(jiffies, ratelimit_time)) {
6630 rc = 1;
6631 ratelimit_time = jiffies + (HZ/5);
6632 } else
6633 rc = 0;
6634
6635 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6636
6637 return rc;
6638 }
6639
6640 /**
6641 * ata_wait_register - wait until register value changes
6642 * @reg: IO-mapped register
6643 * @mask: Mask to apply to read register value
6644 * @val: Wait condition
6645 * @interval: polling interval in milliseconds
6646 * @timeout: timeout in milliseconds
6647 *
6648 * Waiting for some bits of register to change is a common
6649 * operation for ATA controllers. This function reads 32bit LE
6650 * IO-mapped register @reg and tests for the following condition.
6651 *
6652 * (*@reg & mask) != val
6653 *
6654 * If the condition is met, it returns; otherwise, the process is
6655 * repeated after @interval_msec until timeout.
6656 *
6657 * LOCKING:
6658 * Kernel thread context (may sleep)
6659 *
6660 * RETURNS:
6661 * The final register value.
6662 */
6663 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6664 unsigned long interval, unsigned long timeout)
6665 {
6666 unsigned long deadline;
6667 u32 tmp;
6668
6669 tmp = ioread32(reg);
6670
6671 /* Calculate timeout _after_ the first read to make sure
6672 * preceding writes reach the controller before starting to
6673 * eat away the timeout.
6674 */
6675 deadline = ata_deadline(jiffies, timeout);
6676
6677 while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6678 msleep(interval);
6679 tmp = ioread32(reg);
6680 }
6681
6682 return tmp;
6683 }
6684
6685 /*
6686 * Dummy port_ops
6687 */
6688 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6689 {
6690 return AC_ERR_SYSTEM;
6691 }
6692
6693 static void ata_dummy_error_handler(struct ata_port *ap)
6694 {
6695 /* truly dummy */
6696 }
6697
6698 struct ata_port_operations ata_dummy_port_ops = {
6699 .qc_prep = ata_noop_qc_prep,
6700 .qc_issue = ata_dummy_qc_issue,
6701 .error_handler = ata_dummy_error_handler,
6702 };
6703
6704 const struct ata_port_info ata_dummy_port_info = {
6705 .port_ops = &ata_dummy_port_ops,
6706 };
6707
6708 /*
6709 * libata is essentially a library of internal helper functions for
6710 * low-level ATA host controller drivers. As such, the API/ABI is
6711 * likely to change as new drivers are added and updated.
6712 * Do not depend on ABI/API stability.
6713 */
6714 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6715 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6716 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6717 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6718 EXPORT_SYMBOL_GPL(sata_port_ops);
6719 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6720 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6721 EXPORT_SYMBOL_GPL(ata_link_next);
6722 EXPORT_SYMBOL_GPL(ata_dev_next);
6723 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6724 EXPORT_SYMBOL_GPL(ata_host_init);
6725 EXPORT_SYMBOL_GPL(ata_host_alloc);
6726 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6727 EXPORT_SYMBOL_GPL(ata_slave_link_init);
6728 EXPORT_SYMBOL_GPL(ata_host_start);
6729 EXPORT_SYMBOL_GPL(ata_host_register);
6730 EXPORT_SYMBOL_GPL(ata_host_activate);
6731 EXPORT_SYMBOL_GPL(ata_host_detach);
6732 EXPORT_SYMBOL_GPL(ata_sg_init);
6733 EXPORT_SYMBOL_GPL(ata_qc_complete);
6734 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6735 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6736 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6737 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6738 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6739 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6740 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6741 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6742 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6743 EXPORT_SYMBOL_GPL(ata_mode_string);
6744 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6745 EXPORT_SYMBOL_GPL(ata_port_start);
6746 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6747 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6748 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6749 EXPORT_SYMBOL_GPL(ata_port_probe);
6750 EXPORT_SYMBOL_GPL(ata_dev_disable);
6751 EXPORT_SYMBOL_GPL(sata_set_spd);
6752 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6753 EXPORT_SYMBOL_GPL(sata_link_debounce);
6754 EXPORT_SYMBOL_GPL(sata_link_resume);
6755 EXPORT_SYMBOL_GPL(ata_std_prereset);
6756 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6757 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6758 EXPORT_SYMBOL_GPL(ata_std_postreset);
6759 EXPORT_SYMBOL_GPL(ata_dev_classify);
6760 EXPORT_SYMBOL_GPL(ata_dev_pair);
6761 EXPORT_SYMBOL_GPL(ata_port_disable);
6762 EXPORT_SYMBOL_GPL(ata_ratelimit);
6763 EXPORT_SYMBOL_GPL(ata_wait_register);
6764 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6765 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6766 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6767 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6768 EXPORT_SYMBOL_GPL(sata_scr_valid);
6769 EXPORT_SYMBOL_GPL(sata_scr_read);
6770 EXPORT_SYMBOL_GPL(sata_scr_write);
6771 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6772 EXPORT_SYMBOL_GPL(ata_link_online);
6773 EXPORT_SYMBOL_GPL(ata_link_offline);
6774 #ifdef CONFIG_PM
6775 EXPORT_SYMBOL_GPL(ata_host_suspend);
6776 EXPORT_SYMBOL_GPL(ata_host_resume);
6777 #endif /* CONFIG_PM */
6778 EXPORT_SYMBOL_GPL(ata_id_string);
6779 EXPORT_SYMBOL_GPL(ata_id_c_string);
6780 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
6781 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6782
6783 EXPORT_SYMBOL_GPL(ata_pio_queue_task);
6784 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6785 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6786 EXPORT_SYMBOL_GPL(ata_timing_compute);
6787 EXPORT_SYMBOL_GPL(ata_timing_merge);
6788 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6789
6790 #ifdef CONFIG_PCI
6791 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6792 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6793 #ifdef CONFIG_PM
6794 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6795 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6796 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6797 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6798 #endif /* CONFIG_PM */
6799 #endif /* CONFIG_PCI */
6800
6801 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6802 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6803 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6804 EXPORT_SYMBOL_GPL(ata_port_desc);
6805 #ifdef CONFIG_PCI
6806 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6807 #endif /* CONFIG_PCI */
6808 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6809 EXPORT_SYMBOL_GPL(ata_link_abort);
6810 EXPORT_SYMBOL_GPL(ata_port_abort);
6811 EXPORT_SYMBOL_GPL(ata_port_freeze);
6812 EXPORT_SYMBOL_GPL(sata_async_notification);
6813 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6814 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6815 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6816 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6817 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
6818 EXPORT_SYMBOL_GPL(ata_do_eh);
6819 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6820
6821 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6822 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6823 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6824 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6825 EXPORT_SYMBOL_GPL(ata_cable_sata);
6826
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