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libata-pmp: extend ACPI support to cover PMP
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ata / libata-pmp.c
CommitLineData
3af9a77a
TH		 1/*
2 * libata-pmp.c - libata port multiplier support
3 *
4 * Copyright (c) 2007 SUSE Linux Products GmbH
5 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
6 *
7 * This file is released under the GPLv2.
8 */
9
10#include <linux/kernel.h>
11#include <linux/libata.h>
12#include "libata.h"
13
14/**
15 * sata_pmp_read - read PMP register
16 * @link: link to read PMP register for
17 * @reg: register to read
18 * @r_val: resulting value
19 *
20 * Wrapper around ap->ops->pmp_read to make it easier to call and
21 * nomarlize error return value.
22 *
23 * LOCKING:
24 * Kernel thread context (may sleep).
25 *
26 * RETURNS:
27 * 0 on success, -errno on failure.
28 */
29static int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
30{
31 struct ata_port *ap = link->ap;
32 struct ata_device *pmp_dev = ap->link.device;
33 int rc;
34
35 might_sleep();
36
37 rc = ap->ops->pmp_read(pmp_dev, link->pmp, reg, r_val);
38 if (rc)
39 rc = -EIO;
40 return rc;
41}
42
43/**
44 * sata_pmp_write - write PMP register
45 * @link: link to write PMP register for
46 * @reg: register to write
47 * @r_val: value to write
48 *
49 * Wrapper around ap->ops->pmp_write to make it easier to call
50 * and nomarlize error return value.
51 *
52 * LOCKING:
53 * Kernel thread context (may sleep).
54 *
55 * RETURNS:
56 * 0 on success, -errno on failure.
57 */
58static int sata_pmp_write(struct ata_link *link, int reg, u32 val)
59{
60 struct ata_port *ap = link->ap;
61 struct ata_device *pmp_dev = ap->link.device;
62 int rc;
63
64 might_sleep();
65
66 rc = ap->ops->pmp_write(pmp_dev, link->pmp, reg, val);
67 if (rc)
68 rc = -EIO;
69 return rc;
70}
71
72/**
73 * sata_pmp_read_init_tf - initialize TF for PMP read
74 * @tf: taskfile to initialize
75 * @dev: PMP dev
76 * @pmp: port multiplier port number
77 * @reg: register to read
78 *
79 * Initialize @tf for PMP read command.
80 *
81 * LOCKING:
82 * None.
83 */
84void sata_pmp_read_init_tf(struct ata_taskfile *tf,
85 struct ata_device *dev, int pmp, int reg)
86{
87 ata_tf_init(dev, tf);
88 tf->command = ATA_CMD_PMP_READ;
89 tf->protocol = ATA_PROT_NODATA;
90 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
91 tf->feature = reg;
92 tf->device = pmp;
93}
94
95/**
96 * sata_pmp_read_val - extract PMP read result from TF
97 * @tf: target TF
98 *
99 * Determine PMP read result from @tf.
100 *
101 * LOCKING:
102 * None.
103 */
104u32 sata_pmp_read_val(const struct ata_taskfile *tf)
105{
106 return tf->nsect | tf->lbal << 8 | tf->lbam << 16 | tf->lbah << 24;
107}
108
109/**
110 * sata_pmp_read_init_tf - initialize TF for PMP write
111 * @tf: taskfile to initialize
112 * @dev: PMP dev
113 * @pmp: port multiplier port number
114 * @reg: register to read
115 * @val: value to write
116 *
117 * Initialize @tf for PMP write command.
118 *
119 * LOCKING:
120 * None.
121 */
122void sata_pmp_write_init_tf(struct ata_taskfile *tf,
123 struct ata_device *dev, int pmp, int reg, u32 val)
124{
125 ata_tf_init(dev, tf);
126 tf->command = ATA_CMD_PMP_WRITE;
127 tf->protocol = ATA_PROT_NODATA;
128 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
129 tf->feature = reg;
130 tf->device = pmp;
131 tf->nsect = val & 0xff;
132 tf->lbal = (val >> 8) & 0xff;
133 tf->lbam = (val >> 16) & 0xff;
134 tf->lbah = (val >> 24) & 0xff;
135}
136
137/**
138 * sata_pmp_scr_read - read PSCR
139 * @link: ATA link to read PSCR for
140 * @reg: PSCR to read
141 * @r_val: resulting value
142 *
143 * Read PSCR @reg into @r_val for @link, to be called from
144 * ata_scr_read().
145 *
146 * LOCKING:
147 * Kernel thread context (may sleep).
148 *
149 * RETURNS:
150 * 0 on success, -errno on failure.
151 */
152int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
153{
154 if (reg > SATA_PMP_PSCR_CONTROL)
155 return -EINVAL;
156
157 return sata_pmp_read(link, reg, r_val);
158}
159
160/**
161 * sata_pmp_scr_write - write PSCR
162 * @link: ATA link to write PSCR for
163 * @reg: PSCR to write
164 * @val: value to be written
165 *
166 * Write @val to PSCR @reg for @link, to be called from
167 * ata_scr_write() and ata_scr_write_flush().
168 *
169 * LOCKING:
170 * Kernel thread context (may sleep).
171 *
172 * RETURNS:
173 * 0 on success, -errno on failure.
174 */
175int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
176{
177 if (reg > SATA_PMP_PSCR_CONTROL)
178 return -EINVAL;
179
180 return sata_pmp_write(link, reg, val);
181}
182
183/**
184 * sata_pmp_std_prereset - prepare PMP link for reset
185 * @link: link to be reset
186 * @deadline: deadline jiffies for the operation
187 *
188 * @link is about to be reset. Initialize it.
189 *
190 * LOCKING:
191 * Kernel thread context (may sleep)
192 *
193 * RETURNS:
194 * 0 on success, -errno otherwise.
195 */
196int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline)
197{
198 struct ata_eh_context *ehc = &link->eh_context;
199 const unsigned long *timing = sata_ehc_deb_timing(ehc);
200 int rc;
201
202 /* force HRST? */
203 if (link->flags & ATA_LFLAG_NO_SRST)
204 ehc->i.action |= ATA_EH_HARDRESET;
205
206 /* handle link resume */
207 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
208 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
209 ehc->i.action |= ATA_EH_HARDRESET;
210
211 /* if we're about to do hardreset, nothing more to do */
212 if (ehc->i.action & ATA_EH_HARDRESET)
213 return 0;
214
215 /* resume link */
216 rc = sata_link_resume(link, timing, deadline);
217 if (rc) {
218 /* phy resume failed */
219 ata_link_printk(link, KERN_WARNING, "failed to resume link "
220 "for reset (errno=%d)\n", rc);
221 return rc;
222 }
223
224 /* clear SError bits including .X which blocks the port when set */
225 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
226 if (rc) {
227 ata_link_printk(link, KERN_ERR,
228 "failed to clear SError (errno=%d)\n", rc);
229 return rc;
230 }
231
232 return 0;
233}
234
235/**
236 * sata_pmp_std_hardreset - standard hardreset method for PMP link
237 * @link: link to be reset
238 * @class: resulting class of attached device
239 * @deadline: deadline jiffies for the operation
240 *
241 * Hardreset PMP port @link. Note that this function doesn't
242 * wait for BSY clearance. There simply isn't a generic way to
243 * wait the event. Instead, this function return -EAGAIN thus
244 * telling libata-EH to followup with softreset.
245 *
246 * LOCKING:
247 * Kernel thread context (may sleep)
248 *
249 * RETURNS:
250 * 0 on success, -errno otherwise.
251 */
252int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
253 unsigned long deadline)
254{
255 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
256 u32 tmp;
257 int rc;
258
259 DPRINTK("ENTER\n");
260
261 /* do hardreset */
262 rc = sata_link_hardreset(link, timing, deadline);
263 if (rc) {
264 ata_link_printk(link, KERN_ERR,
265 "COMRESET failed (errno=%d)\n", rc);
266 goto out;
267 }
268
269 /* clear SError bits including .X which blocks the port when set */
270 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
271 if (rc) {
272 ata_link_printk(link, KERN_ERR, "failed to clear SError "
273 "during hardreset (errno=%d)\n", rc);
274 goto out;
275 }
276
277 /* if device is present, follow up with srst to wait for !BSY */
278 if (ata_link_online(link))
279 rc = -EAGAIN;
280 out:
281 /* if SCR isn't accessible, we need to reset the PMP */
282 if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp))
283 rc = -ERESTART;
284
285 DPRINTK("EXIT, rc=%d\n", rc);
286 return rc;
287}
288
289/**
290 * ata_std_postreset - standard postreset method for PMP link
291 * @link: the target ata_link
292 * @classes: classes of attached devices
293 *
294 * This function is invoked after a successful reset. Note that
295 * the device might have been reset more than once using
296 * different reset methods before postreset is invoked.
297 *
298 * LOCKING:
299 * Kernel thread context (may sleep)
300 */
301void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class)
302{
303 u32 serror;
304
305 DPRINTK("ENTER\n");
306
307 /* clear SError */
308 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
309 sata_scr_write(link, SCR_ERROR, serror);
310
311 /* print link status */
312 sata_print_link_status(link);
313
314 DPRINTK("EXIT\n");
315}
316
317/**
318 * sata_pmp_read_gscr - read GSCR block of SATA PMP
319 * @dev: PMP device
320 * @gscr: buffer to read GSCR block into
321 *
322 * Read selected PMP GSCRs from the PMP at @dev. This will serve
323 * as configuration and identification info for the PMP.
324 *
325 * LOCKING:
326 * Kernel thread context (may sleep).
327 *
328 * RETURNS:
329 * 0 on success, -errno on failure.
330 */
331static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
332{
333 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
334 int i, rc;
335
336 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
337 int reg = gscr_to_read[i];
338
339 rc = sata_pmp_read(dev->link, reg, &gscr[reg]);
340 if (rc) {
341 ata_dev_printk(dev, KERN_ERR, "failed to read "
342 "PMP GSCR[%d] (errno=%d)\n", reg, rc);
343 return rc;
344 }
345 }
346
347 return 0;
348}
349
350static const char *sata_pmp_spec_rev_str(const u32 *gscr)
351{
352 u32 rev = gscr[SATA_PMP_GSCR_REV];
353
354 if (rev & (1 << 2))
355 return "1.1";
356 if (rev & (1 << 1))
357 return "1.0";
358 return "<unknown>";
359}
360
361static int sata_pmp_configure(struct ata_device *dev, int print_info)
362{
363 struct ata_port *ap = dev->link->ap;
364 u32 *gscr = dev->gscr;
365 const char *reason;
366 int nr_ports, rc;
367
368 nr_ports = sata_pmp_gscr_ports(gscr);
369
370 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
371 rc = -EINVAL;
372 reason = "invalid nr_ports";
373 goto fail;
374 }
375
376 if ((ap->flags & ATA_FLAG_AN) &&
377 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
378 dev->flags |= ATA_DFLAG_AN;
379
380 /* monitor SERR_PHYRDY_CHG on fan-out ports */
381 rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, SERR_PHYRDY_CHG);
382 if (rc) {
383 reason = "failed to write GSCR_ERROR_EN";
384 goto fail;
385 }
386
387 /* turn off notification till fan-out ports are reset and configured */
388 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
389 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
390
391 rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN,
392 gscr[SATA_PMP_GSCR_FEAT_EN]);
393 if (rc) {
394 reason = "failed to write GSCR_FEAT_EN";
395 goto fail;
396 }
397 }
398
399 if (print_info) {
400 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
401 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
402 sata_pmp_spec_rev_str(gscr),
403 sata_pmp_gscr_vendor(gscr),
404 sata_pmp_gscr_devid(gscr),
405 sata_pmp_gscr_rev(gscr),
406 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
407 gscr[SATA_PMP_GSCR_FEAT]);
408
409 if (!(dev->flags & ATA_DFLAG_AN))
410 ata_dev_printk(dev, KERN_INFO,
411 "Asynchronous notification not supported, "
412 "hotplug won't\n work on fan-out "
413 "ports. Use warm-plug instead.\n");
414 }
415
416 return 0;
417
418 fail:
419 ata_dev_printk(dev, KERN_ERR,
420 "failed to configure Port Multiplier (%s)\n", reason);
421 return rc;
422}
423
424static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
425{
426 struct ata_link *pmp_link = ap->pmp_link;
427 int i;
428
429 if (!pmp_link) {
430 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
431 GFP_NOIO);
432 if (!pmp_link)
433 return -ENOMEM;
434
435 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
436 ata_link_init(ap, &pmp_link[i], i);
437
438 ap->pmp_link = pmp_link;
439 }
440
441 for (i = 0; i < nr_ports; i++) {
442 struct ata_link *link = &pmp_link[i];
443 struct ata_eh_context *ehc = &link->eh_context;
444
445 link->flags = 0;
446 ehc->i.probe_mask |= 1;
447 ehc->i.action |= ATA_EH_SOFTRESET;
448 ehc->i.flags |= ATA_EHI_RESUME_LINK;
449 }
450
451 return 0;
452}
453
454static void sata_pmp_quirks(struct ata_port *ap)
455{
456 u32 *gscr = ap->link.device->gscr;
457 u16 vendor = sata_pmp_gscr_vendor(gscr);
458 u16 devid = sata_pmp_gscr_devid(gscr);
459 struct ata_link *link;
460
461 if (vendor == 0x1095 && devid == 0x3726) {
462 /* sil3726 quirks */
463 ata_port_for_each_link(link, ap) {
464 /* SError.N need a kick in the ass to get working */
465 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
466
467 /* class code report is unreliable */
468 if (link->pmp < 5)
469 link->flags |= ATA_LFLAG_ASSUME_ATA;
470
471 /* port 5 is for SEMB device and it doesn't like SRST */
472 if (link->pmp == 5)
473 link->flags |= ATA_LFLAG_NO_SRST |
474 ATA_LFLAG_ASSUME_SEMB;
475 }
476 } else if (vendor == 0x1095 && devid == 0x4723) {
477 /* sil4723 quirks */
478 ata_port_for_each_link(link, ap) {
479 /* SError.N need a kick in the ass to get working */
480 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
481
482 /* class code report is unreliable */
483 if (link->pmp < 2)
484 link->flags |= ATA_LFLAG_ASSUME_ATA;
485
486 /* the config device at port 2 locks up on SRST */
487 if (link->pmp == 2)
488 link->flags |= ATA_LFLAG_NO_SRST |
489 ATA_LFLAG_ASSUME_ATA;
490 }
491 } else if (vendor == 0x1095 && devid == 0x4726) {
492 /* sil4726 quirks */
493 ata_port_for_each_link(link, ap) {
494 /* SError.N need a kick in the ass to get working */
495 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
496
497 /* class code report is unreliable */
498 if (link->pmp < 5)
499 link->flags |= ATA_LFLAG_ASSUME_ATA;
500
501 /* The config device, which can be either at
502 * port 0 or 5, locks up on SRST.
503 */
504 if (link->pmp == 0 || link->pmp == 5)
505 link->flags |= ATA_LFLAG_NO_SRST |
506 ATA_LFLAG_ASSUME_ATA;
507
508 /* Port 6 is for SEMB device which doesn't
509 * like SRST either.
510 */
511 if (link->pmp == 6)
512 link->flags |= ATA_LFLAG_NO_SRST |
513 ATA_LFLAG_ASSUME_SEMB;
514 }
515 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
516 devid == 0x5734 || devid == 0x5744)) {
517 /* sil5723/5744 quirks */
518
519 /* sil5723/5744 has either two or three downstream
520 * ports depending on operation mode. The last port
521 * is empty if any actual IO device is available or
522 * occupied by a pseudo configuration device
523 * otherwise. Don't try hard to recover it.
524 */
525 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
526 } else if (vendor == 0x11ab && devid == 0x4140) {
527 /* Marvell 88SM4140 quirks. Fan-out ports require PHY
528 * reset to work; other than that, it behaves very
529 * nicely.
530 */
531 ata_port_for_each_link(link, ap)
532 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
533 }
534}
535
536/**
537 * sata_pmp_attach - attach a SATA PMP device
538 * @dev: SATA PMP device to attach
539 *
540 * Configure and attach SATA PMP device @dev. This function is
541 * also responsible for allocating and initializing PMP links.
542 *
543 * LOCKING:
544 * Kernel thread context (may sleep).
545 *
546 * RETURNS:
547 * 0 on success, -errno on failure.
548 */
549int sata_pmp_attach(struct ata_device *dev)
550{
551 struct ata_link *link = dev->link;
552 struct ata_port *ap = link->ap;
553 unsigned long flags;
554 struct ata_link *tlink;
555 int rc;
556
557 /* is it hanging off the right place? */
558 if (!(ap->flags & ATA_FLAG_PMP)) {
559 ata_dev_printk(dev, KERN_ERR,
560 "host does not support Port Multiplier\n");
561 return -EINVAL;
562 }
563
564 if (!ata_is_host_link(link)) {
565 ata_dev_printk(dev, KERN_ERR,
566 "Port Multipliers cannot be nested\n");
567 return -EINVAL;
568 }
569
570 if (dev->devno) {
571 ata_dev_printk(dev, KERN_ERR,
572 "Port Multiplier must be the first device\n");
573 return -EINVAL;
574 }
575
576 WARN_ON(link->pmp != 0);
577 link->pmp = SATA_PMP_CTRL_PORT;
578
579 /* read GSCR block */
580 rc = sata_pmp_read_gscr(dev, dev->gscr);
581 if (rc)
582 goto fail;
583
584 /* config PMP */
585 rc = sata_pmp_configure(dev, 1);
586 if (rc)
587 goto fail;
588
589 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
590 if (rc) {
591 ata_dev_printk(dev, KERN_INFO,
592 "failed to initialize PMP links\n");
593 goto fail;
594 }
595
596 /* attach it */
597 spin_lock_irqsave(ap->lock, flags);
598 WARN_ON(ap->nr_pmp_links);
599 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
600 spin_unlock_irqrestore(ap->lock, flags);
601
602 sata_pmp_quirks(ap);
603
604 if (ap->ops->pmp_attach)
605 ap->ops->pmp_attach(ap);
606
607 ata_port_for_each_link(tlink, ap)
608 sata_link_init_spd(tlink);
609
d0df8b5d
TH		 610 ata_acpi_associate_sata_port(ap);
611
3af9a77a
TH		 612 return 0;
613
614 fail:
615 link->pmp = 0;
616 return rc;
617}
618
619/**
620 * sata_pmp_detach - detach a SATA PMP device
621 * @dev: SATA PMP device to detach
622 *
623 * Detach SATA PMP device @dev. This function is also
624 * responsible for deconfiguring PMP links.
625 *
626 * LOCKING:
627 * Kernel thread context (may sleep).
628 */
629static void sata_pmp_detach(struct ata_device *dev)
630{
631 struct ata_link *link = dev->link;
632 struct ata_port *ap = link->ap;
633 struct ata_link *tlink;
634 unsigned long flags;
635
636 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
637
638 WARN_ON(!ata_is_host_link(link) || dev->devno ||
639 link->pmp != SATA_PMP_CTRL_PORT);
640
641 if (ap->ops->pmp_detach)
642 ap->ops->pmp_detach(ap);
643
644 ata_port_for_each_link(tlink, ap)
645 ata_eh_detach_dev(tlink->device);
646
647 spin_lock_irqsave(ap->lock, flags);
648 ap->nr_pmp_links = 0;
649 link->pmp = 0;
650 spin_unlock_irqrestore(ap->lock, flags);
d0df8b5d
TH		 651
652 ata_acpi_associate_sata_port(ap);
3af9a77a
TH		 653}
654
655/**
656 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
657 * @dev: PMP device to compare against
658 * @new_gscr: GSCR block of the new device
659 *
660 * Compare @new_gscr against @dev and determine whether @dev is
661 * the PMP described by @new_gscr.
662 *
663 * LOCKING:
664 * None.
665 *
666 * RETURNS:
667 * 1 if @dev matches @new_gscr, 0 otherwise.
668 */
669static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
670{
671 const u32 *old_gscr = dev->gscr;
672 u16 old_vendor, new_vendor, old_devid, new_devid;
673 int old_nr_ports, new_nr_ports;
674
675 old_vendor = sata_pmp_gscr_vendor(old_gscr);
676 new_vendor = sata_pmp_gscr_vendor(new_gscr);
677 old_devid = sata_pmp_gscr_devid(old_gscr);
678 new_devid = sata_pmp_gscr_devid(new_gscr);
679 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
680 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
681
682 if (old_vendor != new_vendor) {
683 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
684 "vendor mismatch '0x%x' != '0x%x'\n",
685 old_vendor, new_vendor);
686 return 0;
687 }
688
689 if (old_devid != new_devid) {
690 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
691 "device ID mismatch '0x%x' != '0x%x'\n",
692 old_devid, new_devid);
693 return 0;
694 }
695
696 if (old_nr_ports != new_nr_ports) {
697 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
698 "nr_ports mismatch '0x%x' != '0x%x'\n",
699 old_nr_ports, new_nr_ports);
700 return 0;
701 }
702
703 return 1;
704}
705
706/**
707 * sata_pmp_revalidate - revalidate SATA PMP
708 * @dev: PMP device to revalidate
709 * @new_class: new class code
710 *
711 * Re-read GSCR block and make sure @dev is still attached to the
712 * port and properly configured.
713 *
714 * LOCKING:
715 * Kernel thread context (may sleep).
716 *
717 * RETURNS:
718 * 0 on success, -errno otherwise.
719 */
720static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
721{
722 struct ata_link *link = dev->link;
723 struct ata_port *ap = link->ap;
724 u32 *gscr = (void *)ap->sector_buf;
725 int rc;
726
727 DPRINTK("ENTER\n");
728
729 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
730
731 if (!ata_dev_enabled(dev)) {
732 rc = -ENODEV;
733 goto fail;
734 }
735
736 /* wrong class? */
737 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
738 rc = -ENODEV;
739 goto fail;
740 }
741
742 /* read GSCR */
743 rc = sata_pmp_read_gscr(dev, gscr);
744 if (rc)
745 goto fail;
746
747 /* is the pmp still there? */
748 if (!sata_pmp_same_pmp(dev, gscr)) {
749 rc = -ENODEV;
750 goto fail;
751 }
752
753 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
754
755 rc = sata_pmp_configure(dev, 0);
756 if (rc)
757 goto fail;
758
759 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
760
761 DPRINTK("EXIT, rc=0\n");
762 return 0;
763
764 fail:
765 ata_dev_printk(dev, KERN_ERR,
766 "PMP revalidation failed (errno=%d)\n", rc);
767 DPRINTK("EXIT, rc=%d\n", rc);
768 return rc;
769}
770
771/**
772 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
773 * @dev: PMP device to revalidate
774 *
775 * Make sure the attached PMP is accessible.
776 *
777 * LOCKING:
778 * Kernel thread context (may sleep).
779 *
780 * RETURNS:
781 * 0 on success, -errno otherwise.
782 */
783static int sata_pmp_revalidate_quick(struct ata_device *dev)
784{
785 u32 prod_id;
786 int rc;
787
788 rc = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
789 if (rc) {
790 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID\n");
791 return rc;
792 }
793
794 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
795 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
796 /* something weird is going on, request full PMP recovery */
797 return -EIO;
798 }
799
800 return 0;
801}
802
803/**
804 * sata_pmp_eh_recover_pmp - recover PMP
805 * @ap: ATA port PMP is attached to
806 * @prereset: prereset method (can be NULL)
807 * @softreset: softreset method
808 * @hardreset: hardreset method
809 * @postreset: postreset method (can be NULL)
810 *
811 * Recover PMP attached to @ap. Recovery procedure is somewhat
812 * similar to that of ata_eh_recover() except that reset should
813 * always be performed in hard->soft sequence and recovery
814 * failure results in PMP detachment.
815 *
816 * LOCKING:
817 * Kernel thread context (may sleep).
818 *
819 * RETURNS:
820 * 0 on success, -errno on failure.
821 */
822static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
823 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
824 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
825{
826 struct ata_link *link = &ap->link;
827 struct ata_eh_context *ehc = &link->eh_context;
828 struct ata_device *dev = link->device;
829 int tries = ATA_EH_PMP_TRIES;
830 int detach = 0, rc = 0;
831 int reval_failed = 0;
832
833 DPRINTK("ENTER\n");
834
835 if (dev->flags & ATA_DFLAG_DETACH) {
836 detach = 1;
837 goto fail;
838 }
839
840 retry:
841 ehc->classes[0] = ATA_DEV_UNKNOWN;
842
843 if (ehc->i.action & ATA_EH_RESET_MASK) {
844 struct ata_link *tlink;
845
846 ata_eh_freeze_port(ap);
847
848 /* reset */
849 ehc->i.action = ATA_EH_HARDRESET;
850 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
851 postreset);
852 if (rc) {
853 ata_link_printk(link, KERN_ERR,
854 "failed to reset PMP, giving up\n");
855 goto fail;
856 }
857
858 ata_eh_thaw_port(ap);
859
860 /* PMP is reset, SErrors cannot be trusted, scan all */
861 ata_port_for_each_link(tlink, ap)
862 ata_ehi_schedule_probe(&tlink->eh_context.i);
863 }
864
865 /* If revalidation is requested, revalidate and reconfigure;
866 * otherwise, do quick revalidation.
867 */
868 if (ehc->i.action & ATA_EH_REVALIDATE)
869 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
870 else
871 rc = sata_pmp_revalidate_quick(dev);
872
873 if (rc) {
874 tries--;
875
876 if (rc == -ENODEV) {
877 ehc->i.probe_mask |= 1;
878 detach = 1;
879 /* give it just two more chances */
880 tries = min(tries, 2);
881 }
882
883 if (tries) {
884 int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
885
886 /* consecutive revalidation failures? speed down */
887 if (reval_failed)
888 sata_down_spd_limit(link);
889 else
890 reval_failed = 1;
891
892 ata_dev_printk(dev, KERN_WARNING,
893 "retrying hardreset%s\n",
894 sleep ? " in 5 secs" : "");
895 if (sleep)
896 ssleep(5);
897 ehc->i.action |= ATA_EH_HARDRESET;
898 goto retry;
899 } else {
900 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
901 "after %d tries, giving up\n",
902 ATA_EH_PMP_TRIES);
903 goto fail;
904 }
905 }
906
907 /* okay, PMP resurrected */
908 ehc->i.flags = 0;
909
910 DPRINTK("EXIT, rc=0\n");
911 return 0;
912
913 fail:
914 sata_pmp_detach(dev);
915 if (detach)
916 ata_eh_detach_dev(dev);
917 else
918 ata_dev_disable(dev);
919
920 DPRINTK("EXIT, rc=%d\n", rc);
921 return rc;
922}
923
924static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
925{
926 struct ata_link *link;
927 unsigned long flags;
928 int rc;
929
930 spin_lock_irqsave(ap->lock, flags);
931
932 ata_port_for_each_link(link, ap) {
933 if (!(link->flags & ATA_LFLAG_DISABLED))
934 continue;
935
936 spin_unlock_irqrestore(ap->lock, flags);
937
938 /* Some PMPs require hardreset sequence to get
939 * SError.N working.
940 */
941 if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) &&
942 (link->eh_context.i.flags & ATA_EHI_RESUME_LINK))
943 sata_link_hardreset(link, sata_deb_timing_normal,
944 jiffies + ATA_TMOUT_INTERNAL_QUICK);
945
946 /* unconditionally clear SError.N */
947 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
948 if (rc) {
949 ata_link_printk(link, KERN_ERR, "failed to clear "
950 "SError.N (errno=%d)\n", rc);
951 return rc;
952 }
953
954 spin_lock_irqsave(ap->lock, flags);
955 }
956
957 spin_unlock_irqrestore(ap->lock, flags);
958
959 return 0;
960}
961
962static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
963{
964 struct ata_port *ap = link->ap;
965 unsigned long flags;
966
967 if (link_tries[link->pmp] && --link_tries[link->pmp])
968 return 1;
969
970 /* disable this link */
971 if (!(link->flags & ATA_LFLAG_DISABLED)) {
972 ata_link_printk(link, KERN_WARNING,
973 "failed to recover link after %d tries, disabling\n",
974 ATA_EH_PMP_LINK_TRIES);
975
976 spin_lock_irqsave(ap->lock, flags);
977 link->flags |= ATA_LFLAG_DISABLED;
978 spin_unlock_irqrestore(ap->lock, flags);
979 }
980
981 ata_dev_disable(link->device);
982 link->eh_context.i.action = 0;
983
984 return 0;
985}
986
987/**
988 * sata_pmp_eh_recover - recover PMP-enabled port
989 * @ap: ATA port to recover
990 * @prereset: prereset method (can be NULL)
991 * @softreset: softreset method
992 * @hardreset: hardreset method
993 * @postreset: postreset method (can be NULL)
994 * @pmp_prereset: PMP prereset method (can be NULL)
995 * @pmp_softreset: PMP softreset method (can be NULL)
996 * @pmp_hardreset: PMP hardreset method (can be NULL)
997 * @pmp_postreset: PMP postreset method (can be NULL)
998 *
999 * Drive EH recovery operation for PMP enabled port @ap. This
1000 * function recovers host and PMP ports with proper retrials and
1001 * fallbacks. Actual recovery operations are performed using
1002 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
1003 *
1004 * LOCKING:
1005 * Kernel thread context (may sleep).
1006 *
1007 * RETURNS:
1008 * 0 on success, -errno on failure.
1009 */
1010static int sata_pmp_eh_recover(struct ata_port *ap,
1011 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
1012 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
1013 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
1014 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
1015{
1016 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
1017 struct ata_link *pmp_link = &ap->link;
1018 struct ata_device *pmp_dev = pmp_link->device;
1019 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
1020 struct ata_link *link;
1021 struct ata_device *dev;
1022 u32 gscr_error, sntf;
1023 int cnt, rc;
1024
1025 pmp_tries = ATA_EH_PMP_TRIES;
1026 ata_port_for_each_link(link, ap)
1027 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
1028
1029 retry:
1030 /* PMP attached? */
1031 if (!ap->nr_pmp_links) {
1032 rc = ata_eh_recover(ap, prereset, softreset, hardreset,
1033 postreset, NULL);
1034 if (rc) {
1035 ata_link_for_each_dev(dev, &ap->link)
1036 ata_dev_disable(dev);
1037 return rc;
1038 }
1039
1040 if (pmp_dev->class != ATA_DEV_PMP)
1041 return 0;
1042
1043 /* new PMP online */
1044 ata_port_for_each_link(link, ap)
1045 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
1046
1047 /* fall through */
1048 }
1049
1050 /* recover pmp */
1051 rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset,
1052 postreset);
1053 if (rc)
1054 goto pmp_fail;
1055
1056 /* handle disabled links */
1057 rc = sata_pmp_eh_handle_disabled_links(ap);
1058 if (rc)
1059 goto pmp_fail;
1060
1061 /* recover links */
1062 rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset,
1063 pmp_postreset, &link);
1064 if (rc)
1065 goto link_fail;
1066
1067 /* Connection status might have changed while resetting other
1068 * links, check SATA_PMP_GSCR_ERROR before returning.
1069 */
1070
1071 /* clear SNotification */
1072 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1073 if (rc == 0)
1074 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1075
1076 /* enable notification */
1077 if (pmp_dev->flags & ATA_DFLAG_AN) {
1078 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1079
1080 rc = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN,
1081 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]);
1082 if (rc) {
1083 ata_dev_printk(pmp_dev, KERN_ERR,
1084 "failed to write PMP_FEAT_EN\n");
1085 goto pmp_fail;
1086 }
1087 }
1088
1089 /* check GSCR_ERROR */
1090 rc = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1091 if (rc) {
1092 ata_dev_printk(pmp_dev, KERN_ERR,
1093 "failed to read PMP_GSCR_ERROR\n");
1094 goto pmp_fail;
1095 }
1096
1097 cnt = 0;
1098 ata_port_for_each_link(link, ap) {
1099 if (!(gscr_error & (1 << link->pmp)))
1100 continue;
1101
1102 if (sata_pmp_handle_link_fail(link, link_tries)) {
1103 ata_ehi_hotplugged(&link->eh_context.i);
1104 cnt++;
1105 } else {
1106 ata_link_printk(link, KERN_WARNING,
1107 "PHY status changed but maxed out on retries, "
1108 "giving up\n");
1109 ata_link_printk(link, KERN_WARNING,
1110 "Manully issue scan to resume this link\n");
1111 }
1112 }
1113
1114 if (cnt) {
1115 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
1116 "ports, repeating recovery\n");
1117 goto retry;
1118 }
1119
1120 return 0;
1121
1122 link_fail:
1123 if (sata_pmp_handle_link_fail(link, link_tries)) {
1124 pmp_ehc->i.action |= ATA_EH_HARDRESET;
1125 goto retry;
1126 }
1127
1128 /* fall through */
1129 pmp_fail:
1130 /* Control always ends up here after detaching PMP. Shut up
1131 * and return if we're unloading.
1132 */
1133 if (ap->pflags & ATA_PFLAG_UNLOADING)
1134 return rc;
1135
1136 if (!ap->nr_pmp_links)
1137 goto retry;
1138
1139 if (--pmp_tries) {
1140 ata_port_printk(ap, KERN_WARNING,
1141 "failed to recover PMP, retrying in 5 secs\n");
1142 pmp_ehc->i.action |= ATA_EH_HARDRESET;
1143 ssleep(5);
1144 goto retry;
1145 }
1146
1147 ata_port_printk(ap, KERN_ERR,
1148 "failed to recover PMP after %d tries, giving up\n",
1149 ATA_EH_PMP_TRIES);
1150 sata_pmp_detach(pmp_dev);
1151 ata_dev_disable(pmp_dev);
1152
1153 return rc;
1154}
1155
1156/**
1157 * sata_pmp_do_eh - do standard error handling for PMP-enabled host
1158 * @ap: host port to handle error for
1159 * @prereset: prereset method (can be NULL)
1160 * @softreset: softreset method
1161 * @hardreset: hardreset method
1162 * @postreset: postreset method (can be NULL)
1163 * @pmp_prereset: PMP prereset method (can be NULL)
1164 * @pmp_softreset: PMP softreset method (can be NULL)
1165 * @pmp_hardreset: PMP hardreset method (can be NULL)
1166 * @pmp_postreset: PMP postreset method (can be NULL)
1167 *
1168 * Perform standard error handling sequence for PMP-enabled host
1169 * @ap.
1170 *
1171 * LOCKING:
1172 * Kernel thread context (may sleep).
1173 */
1174void sata_pmp_do_eh(struct ata_port *ap,
1175 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
1176 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
1177 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
1178 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
1179{
1180 ata_eh_autopsy(ap);
1181 ata_eh_report(ap);
1182 sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset,
1183 pmp_prereset, pmp_softreset, pmp_hardreset,
1184 pmp_postreset);
1185 ata_eh_finish(ap);
1186}
kernel source for telekom puls (alcatel/mediatek)