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PM: OMAP3: Removed a couple of unused variables from DVFS code
[linux-ginger.git] / drivers / ata / libata-pmp.c
blob51f0ffb78cbd62af877453cd2bea3a07e999cc46
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 const struct ata_port_operations sata_pmp_port_ops = {
15 .inherits = &sata_port_ops,
16 .pmp_prereset = ata_std_prereset,
17 .pmp_hardreset = sata_std_hardreset,
18 .pmp_postreset = ata_std_postreset,
19 .error_handler = sata_pmp_error_handler,
20 };
21
22 /**
23 * sata_pmp_read - read PMP register
24 * @link: link to read PMP register for
25 * @reg: register to read
26 * @r_val: resulting value
27 *
28 * Read PMP register.
29 *
30 * LOCKING:
31 * Kernel thread context (may sleep).
32 *
33 * RETURNS:
34 * 0 on success, AC_ERR_* mask on failure.
35 */
36 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
37 {
38 struct ata_port *ap = link->ap;
39 struct ata_device *pmp_dev = ap->link.device;
40 struct ata_taskfile tf;
41 unsigned int err_mask;
42
43 ata_tf_init(pmp_dev, &tf);
44 tf.command = ATA_CMD_PMP_READ;
45 tf.protocol = ATA_PROT_NODATA;
46 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
47 tf.feature = reg;
48 tf.device = link->pmp;
49
50 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
51 SATA_PMP_RW_TIMEOUT);
52 if (err_mask)
53 return err_mask;
54
55 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
56 return 0;
57 }
58
59 /**
60 * sata_pmp_write - write PMP register
61 * @link: link to write PMP register for
62 * @reg: register to write
63 * @r_val: value to write
64 *
65 * Write PMP register.
66 *
67 * LOCKING:
68 * Kernel thread context (may sleep).
69 *
70 * RETURNS:
71 * 0 on success, AC_ERR_* mask on failure.
72 */
73 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
74 {
75 struct ata_port *ap = link->ap;
76 struct ata_device *pmp_dev = ap->link.device;
77 struct ata_taskfile tf;
78
79 ata_tf_init(pmp_dev, &tf);
80 tf.command = ATA_CMD_PMP_WRITE;
81 tf.protocol = ATA_PROT_NODATA;
82 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
83 tf.feature = reg;
84 tf.device = link->pmp;
85 tf.nsect = val & 0xff;
86 tf.lbal = (val >> 8) & 0xff;
87 tf.lbam = (val >> 16) & 0xff;
88 tf.lbah = (val >> 24) & 0xff;
89
90 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
91 SATA_PMP_RW_TIMEOUT);
92 }
93
94 /**
95 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
96 * @qc: ATA command in question
97 *
98 * A host which has command switching PMP support cannot issue
99 * commands to multiple links simultaneously.
100 *
101 * LOCKING:
102 * spin_lock_irqsave(host lock)
103 *
104 * RETURNS:
105 * ATA_DEFER_* if deferring is needed, 0 otherwise.
106 */
107 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
108 {
109 struct ata_link *link = qc->dev->link;
110 struct ata_port *ap = link->ap;
111
112 if (ap->excl_link == NULL || ap->excl_link == link) {
113 if (ap->nr_active_links == 0 || ata_link_active(link)) {
114 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
115 return ata_std_qc_defer(qc);
116 }
117
118 ap->excl_link = link;
119 }
120
121 return ATA_DEFER_PORT;
122 }
123
124 /**
125 * sata_pmp_scr_read - read PSCR
126 * @link: ATA link to read PSCR for
127 * @reg: PSCR to read
128 * @r_val: resulting value
129 *
130 * Read PSCR @reg into @r_val for @link, to be called from
131 * ata_scr_read().
132 *
133 * LOCKING:
134 * Kernel thread context (may sleep).
135 *
136 * RETURNS:
137 * 0 on success, -errno on failure.
138 */
139 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
140 {
141 unsigned int err_mask;
142
143 if (reg > SATA_PMP_PSCR_CONTROL)
144 return -EINVAL;
145
146 err_mask = sata_pmp_read(link, reg, r_val);
147 if (err_mask) {
148 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
149 "(Emask=0x%x)\n", reg, err_mask);
150 return -EIO;
151 }
152 return 0;
153 }
154
155 /**
156 * sata_pmp_scr_write - write PSCR
157 * @link: ATA link to write PSCR for
158 * @reg: PSCR to write
159 * @val: value to be written
160 *
161 * Write @val to PSCR @reg for @link, to be called from
162 * ata_scr_write() and ata_scr_write_flush().
163 *
164 * LOCKING:
165 * Kernel thread context (may sleep).
166 *
167 * RETURNS:
168 * 0 on success, -errno on failure.
169 */
170 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
171 {
172 unsigned int err_mask;
173
174 if (reg > SATA_PMP_PSCR_CONTROL)
175 return -EINVAL;
176
177 err_mask = sata_pmp_write(link, reg, val);
178 if (err_mask) {
179 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
180 "(Emask=0x%x)\n", reg, err_mask);
181 return -EIO;
182 }
183 return 0;
184 }
185
186 /**
187 * sata_pmp_read_gscr - read GSCR block of SATA PMP
188 * @dev: PMP device
189 * @gscr: buffer to read GSCR block into
190 *
191 * Read selected PMP GSCRs from the PMP at @dev. This will serve
192 * as configuration and identification info for the PMP.
193 *
194 * LOCKING:
195 * Kernel thread context (may sleep).
196 *
197 * RETURNS:
198 * 0 on success, -errno on failure.
199 */
200 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
201 {
202 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
203 int i;
204
205 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
206 int reg = gscr_to_read[i];
207 unsigned int err_mask;
208
209 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
210 if (err_mask) {
211 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
212 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
213 return -EIO;
214 }
215 }
216
217 return 0;
218 }
219
220 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
221 {
222 u32 rev = gscr[SATA_PMP_GSCR_REV];
223
224 if (rev & (1 << 3))
225 return "1.2";
226 if (rev & (1 << 2))
227 return "1.1";
228 if (rev & (1 << 1))
229 return "1.0";
230 return "<unknown>";
231 }
232
233 static int sata_pmp_configure(struct ata_device *dev, int print_info)
234 {
235 struct ata_port *ap = dev->link->ap;
236 u32 *gscr = dev->gscr;
237 unsigned int err_mask = 0;
238 const char *reason;
239 int nr_ports, rc;
240
241 nr_ports = sata_pmp_gscr_ports(gscr);
242
243 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
244 rc = -EINVAL;
245 reason = "invalid nr_ports";
246 goto fail;
247 }
248
249 if ((ap->flags & ATA_FLAG_AN) &&
250 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
251 dev->flags |= ATA_DFLAG_AN;
252
253 /* monitor SERR_PHYRDY_CHG on fan-out ports */
254 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
255 SERR_PHYRDY_CHG);
256 if (err_mask) {
257 rc = -EIO;
258 reason = "failed to write GSCR_ERROR_EN";
259 goto fail;
260 }
261
262 if (print_info) {
263 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
264 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
265 sata_pmp_spec_rev_str(gscr),
266 sata_pmp_gscr_vendor(gscr),
267 sata_pmp_gscr_devid(gscr),
268 sata_pmp_gscr_rev(gscr),
269 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
270 gscr[SATA_PMP_GSCR_FEAT]);
271
272 if (!(dev->flags & ATA_DFLAG_AN))
273 ata_dev_printk(dev, KERN_INFO,
274 "Asynchronous notification not supported, "
275 "hotplug won't\n work on fan-out "
276 "ports. Use warm-plug instead.\n");
277 }
278
279 return 0;
280
281 fail:
282 ata_dev_printk(dev, KERN_ERR,
283 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
284 reason, err_mask);
285 return rc;
286 }
287
288 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
289 {
290 struct ata_link *pmp_link = ap->pmp_link;
291 int i;
292
293 if (!pmp_link) {
294 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
295 GFP_NOIO);
296 if (!pmp_link)
297 return -ENOMEM;
298
299 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
300 ata_link_init(ap, &pmp_link[i], i);
301
302 ap->pmp_link = pmp_link;
303 }
304
305 for (i = 0; i < nr_ports; i++) {
306 struct ata_link *link = &pmp_link[i];
307 struct ata_eh_context *ehc = &link->eh_context;
308
309 link->flags = 0;
310 ehc->i.probe_mask |= ATA_ALL_DEVICES;
311 ehc->i.action |= ATA_EH_RESET;
312 }
313
314 return 0;
315 }
316
317 static void sata_pmp_quirks(struct ata_port *ap)
318 {
319 u32 *gscr = ap->link.device->gscr;
320 u16 vendor = sata_pmp_gscr_vendor(gscr);
321 u16 devid = sata_pmp_gscr_devid(gscr);
322 struct ata_link *link;
323
324 if (vendor == 0x1095 && devid == 0x3726) {
325 /* sil3726 quirks */
326 ata_for_each_link(link, ap, EDGE) {
327 /* Class code report is unreliable and SRST
328 * times out under certain configurations.
329 */
330 if (link->pmp < 5)
331 link->flags |= ATA_LFLAG_NO_SRST |
332 ATA_LFLAG_ASSUME_ATA;
333
334 /* port 5 is for SEMB device and it doesn't like SRST */
335 if (link->pmp == 5)
336 link->flags |= ATA_LFLAG_NO_SRST |
337 ATA_LFLAG_ASSUME_SEMB;
338 }
339 } else if (vendor == 0x1095 && devid == 0x4723) {
340 /* sil4723 quirks */
341 ata_for_each_link(link, ap, EDGE) {
342 /* class code report is unreliable */
343 if (link->pmp < 2)
344 link->flags |= ATA_LFLAG_ASSUME_ATA;
345
346 /* the config device at port 2 locks up on SRST */
347 if (link->pmp == 2)
348 link->flags |= ATA_LFLAG_NO_SRST |
349 ATA_LFLAG_ASSUME_ATA;
350 }
351 } else if (vendor == 0x1095 && devid == 0x4726) {
352 /* sil4726 quirks */
353 ata_for_each_link(link, ap, EDGE) {
354 /* Class code report is unreliable and SRST
355 * times out under certain configurations.
356 * Config device can be at port 0 or 5 and
357 * locks up on SRST.
358 */
359 if (link->pmp <= 5)
360 link->flags |= ATA_LFLAG_NO_SRST |
361 ATA_LFLAG_ASSUME_ATA;
362
363 /* Port 6 is for SEMB device which doesn't
364 * like SRST either.
365 */
366 if (link->pmp == 6)
367 link->flags |= ATA_LFLAG_NO_SRST |
368 ATA_LFLAG_ASSUME_SEMB;
369 }
370 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
371 devid == 0x5734 || devid == 0x5744)) {
372 /* sil5723/5744 quirks */
373
374 /* sil5723/5744 has either two or three downstream
375 * ports depending on operation mode. The last port
376 * is empty if any actual IO device is available or
377 * occupied by a pseudo configuration device
378 * otherwise. Don't try hard to recover it.
379 */
380 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
381 }
382 }
383
384 /**
385 * sata_pmp_attach - attach a SATA PMP device
386 * @dev: SATA PMP device to attach
387 *
388 * Configure and attach SATA PMP device @dev. This function is
389 * also responsible for allocating and initializing PMP links.
390 *
391 * LOCKING:
392 * Kernel thread context (may sleep).
393 *
394 * RETURNS:
395 * 0 on success, -errno on failure.
396 */
397 int sata_pmp_attach(struct ata_device *dev)
398 {
399 struct ata_link *link = dev->link;
400 struct ata_port *ap = link->ap;
401 unsigned long flags;
402 struct ata_link *tlink;
403 int rc;
404
405 /* is it hanging off the right place? */
406 if (!sata_pmp_supported(ap)) {
407 ata_dev_printk(dev, KERN_ERR,
408 "host does not support Port Multiplier\n");
409 return -EINVAL;
410 }
411
412 if (!ata_is_host_link(link)) {
413 ata_dev_printk(dev, KERN_ERR,
414 "Port Multipliers cannot be nested\n");
415 return -EINVAL;
416 }
417
418 if (dev->devno) {
419 ata_dev_printk(dev, KERN_ERR,
420 "Port Multiplier must be the first device\n");
421 return -EINVAL;
422 }
423
424 WARN_ON(link->pmp != 0);
425 link->pmp = SATA_PMP_CTRL_PORT;
426
427 /* read GSCR block */
428 rc = sata_pmp_read_gscr(dev, dev->gscr);
429 if (rc)
430 goto fail;
431
432 /* config PMP */
433 rc = sata_pmp_configure(dev, 1);
434 if (rc)
435 goto fail;
436
437 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
438 if (rc) {
439 ata_dev_printk(dev, KERN_INFO,
440 "failed to initialize PMP links\n");
441 goto fail;
442 }
443
444 /* attach it */
445 spin_lock_irqsave(ap->lock, flags);
446 WARN_ON(ap->nr_pmp_links);
447 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
448 spin_unlock_irqrestore(ap->lock, flags);
449
450 sata_pmp_quirks(ap);
451
452 if (ap->ops->pmp_attach)
453 ap->ops->pmp_attach(ap);
454
455 ata_for_each_link(tlink, ap, EDGE)
456 sata_link_init_spd(tlink);
457
458 ata_acpi_associate_sata_port(ap);
459
460 return 0;
461
462 fail:
463 link->pmp = 0;
464 return rc;
465 }
466
467 /**
468 * sata_pmp_detach - detach a SATA PMP device
469 * @dev: SATA PMP device to detach
470 *
471 * Detach SATA PMP device @dev. This function is also
472 * responsible for deconfiguring PMP links.
473 *
474 * LOCKING:
475 * Kernel thread context (may sleep).
476 */
477 static void sata_pmp_detach(struct ata_device *dev)
478 {
479 struct ata_link *link = dev->link;
480 struct ata_port *ap = link->ap;
481 struct ata_link *tlink;
482 unsigned long flags;
483
484 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
485
486 WARN_ON(!ata_is_host_link(link) || dev->devno ||
487 link->pmp != SATA_PMP_CTRL_PORT);
488
489 if (ap->ops->pmp_detach)
490 ap->ops->pmp_detach(ap);
491
492 ata_for_each_link(tlink, ap, EDGE)
493 ata_eh_detach_dev(tlink->device);
494
495 spin_lock_irqsave(ap->lock, flags);
496 ap->nr_pmp_links = 0;
497 link->pmp = 0;
498 spin_unlock_irqrestore(ap->lock, flags);
499
500 ata_acpi_associate_sata_port(ap);
501 }
502
503 /**
504 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
505 * @dev: PMP device to compare against
506 * @new_gscr: GSCR block of the new device
507 *
508 * Compare @new_gscr against @dev and determine whether @dev is
509 * the PMP described by @new_gscr.
510 *
511 * LOCKING:
512 * None.
513 *
514 * RETURNS:
515 * 1 if @dev matches @new_gscr, 0 otherwise.
516 */
517 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
518 {
519 const u32 *old_gscr = dev->gscr;
520 u16 old_vendor, new_vendor, old_devid, new_devid;
521 int old_nr_ports, new_nr_ports;
522
523 old_vendor = sata_pmp_gscr_vendor(old_gscr);
524 new_vendor = sata_pmp_gscr_vendor(new_gscr);
525 old_devid = sata_pmp_gscr_devid(old_gscr);
526 new_devid = sata_pmp_gscr_devid(new_gscr);
527 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
528 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
529
530 if (old_vendor != new_vendor) {
531 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
532 "vendor mismatch '0x%x' != '0x%x'\n",
533 old_vendor, new_vendor);
534 return 0;
535 }
536
537 if (old_devid != new_devid) {
538 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
539 "device ID mismatch '0x%x' != '0x%x'\n",
540 old_devid, new_devid);
541 return 0;
542 }
543
544 if (old_nr_ports != new_nr_ports) {
545 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
546 "nr_ports mismatch '0x%x' != '0x%x'\n",
547 old_nr_ports, new_nr_ports);
548 return 0;
549 }
550
551 return 1;
552 }
553
554 /**
555 * sata_pmp_revalidate - revalidate SATA PMP
556 * @dev: PMP device to revalidate
557 * @new_class: new class code
558 *
559 * Re-read GSCR block and make sure @dev is still attached to the
560 * port and properly configured.
561 *
562 * LOCKING:
563 * Kernel thread context (may sleep).
564 *
565 * RETURNS:
566 * 0 on success, -errno otherwise.
567 */
568 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
569 {
570 struct ata_link *link = dev->link;
571 struct ata_port *ap = link->ap;
572 u32 *gscr = (void *)ap->sector_buf;
573 int rc;
574
575 DPRINTK("ENTER\n");
576
577 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
578
579 if (!ata_dev_enabled(dev)) {
580 rc = -ENODEV;
581 goto fail;
582 }
583
584 /* wrong class? */
585 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
586 rc = -ENODEV;
587 goto fail;
588 }
589
590 /* read GSCR */
591 rc = sata_pmp_read_gscr(dev, gscr);
592 if (rc)
593 goto fail;
594
595 /* is the pmp still there? */
596 if (!sata_pmp_same_pmp(dev, gscr)) {
597 rc = -ENODEV;
598 goto fail;
599 }
600
601 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
602
603 rc = sata_pmp_configure(dev, 0);
604 if (rc)
605 goto fail;
606
607 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
608
609 DPRINTK("EXIT, rc=0\n");
610 return 0;
611
612 fail:
613 ata_dev_printk(dev, KERN_ERR,
614 "PMP revalidation failed (errno=%d)\n", rc);
615 DPRINTK("EXIT, rc=%d\n", rc);
616 return rc;
617 }
618
619 /**
620 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
621 * @dev: PMP device to revalidate
622 *
623 * Make sure the attached PMP is accessible.
624 *
625 * LOCKING:
626 * Kernel thread context (may sleep).
627 *
628 * RETURNS:
629 * 0 on success, -errno otherwise.
630 */
631 static int sata_pmp_revalidate_quick(struct ata_device *dev)
632 {
633 unsigned int err_mask;
634 u32 prod_id;
635
636 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
637 if (err_mask) {
638 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
639 "(Emask=0x%x)\n", err_mask);
640 return -EIO;
641 }
642
643 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
644 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
645 /* something weird is going on, request full PMP recovery */
646 return -EIO;
647 }
648
649 return 0;
650 }
651
652 /**
653 * sata_pmp_eh_recover_pmp - recover PMP
654 * @ap: ATA port PMP is attached to
655 * @prereset: prereset method (can be NULL)
656 * @softreset: softreset method
657 * @hardreset: hardreset method
658 * @postreset: postreset method (can be NULL)
659 *
660 * Recover PMP attached to @ap. Recovery procedure is somewhat
661 * similar to that of ata_eh_recover() except that reset should
662 * always be performed in hard->soft sequence and recovery
663 * failure results in PMP detachment.
664 *
665 * LOCKING:
666 * Kernel thread context (may sleep).
667 *
668 * RETURNS:
669 * 0 on success, -errno on failure.
670 */
671 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
672 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
673 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
674 {
675 struct ata_link *link = &ap->link;
676 struct ata_eh_context *ehc = &link->eh_context;
677 struct ata_device *dev = link->device;
678 int tries = ATA_EH_PMP_TRIES;
679 int detach = 0, rc = 0;
680 int reval_failed = 0;
681
682 DPRINTK("ENTER\n");
683
684 if (dev->flags & ATA_DFLAG_DETACH) {
685 detach = 1;
686 goto fail;
687 }
688
689 retry:
690 ehc->classes[0] = ATA_DEV_UNKNOWN;
691
692 if (ehc->i.action & ATA_EH_RESET) {
693 struct ata_link *tlink;
694
695 /* reset */
696 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
697 postreset);
698 if (rc) {
699 ata_link_printk(link, KERN_ERR,
700 "failed to reset PMP, giving up\n");
701 goto fail;
702 }
703
704 /* PMP is reset, SErrors cannot be trusted, scan all */
705 ata_for_each_link(tlink, ap, EDGE) {
706 struct ata_eh_context *ehc = &tlink->eh_context;
707
708 ehc->i.probe_mask |= ATA_ALL_DEVICES;
709 ehc->i.action |= ATA_EH_RESET;
710 }
711 }
712
713 /* If revalidation is requested, revalidate and reconfigure;
714 * otherwise, do quick revalidation.
715 */
716 if (ehc->i.action & ATA_EH_REVALIDATE)
717 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
718 else
719 rc = sata_pmp_revalidate_quick(dev);
720
721 if (rc) {
722 tries--;
723
724 if (rc == -ENODEV) {
725 ehc->i.probe_mask |= ATA_ALL_DEVICES;
726 detach = 1;
727 /* give it just two more chances */
728 tries = min(tries, 2);
729 }
730
731 if (tries) {
732 /* consecutive revalidation failures? speed down */
733 if (reval_failed)
734 sata_down_spd_limit(link, 0);
735 else
736 reval_failed = 1;
737
738 ehc->i.action |= ATA_EH_RESET;
739 goto retry;
740 } else {
741 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
742 "after %d tries, giving up\n",
743 ATA_EH_PMP_TRIES);
744 goto fail;
745 }
746 }
747
748 /* okay, PMP resurrected */
749 ehc->i.flags = 0;
750
751 DPRINTK("EXIT, rc=0\n");
752 return 0;
753
754 fail:
755 sata_pmp_detach(dev);
756 if (detach)
757 ata_eh_detach_dev(dev);
758 else
759 ata_dev_disable(dev);
760
761 DPRINTK("EXIT, rc=%d\n", rc);
762 return rc;
763 }
764
765 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
766 {
767 struct ata_link *link;
768 unsigned long flags;
769 int rc;
770
771 spin_lock_irqsave(ap->lock, flags);
772
773 ata_for_each_link(link, ap, EDGE) {
774 if (!(link->flags & ATA_LFLAG_DISABLED))
775 continue;
776
777 spin_unlock_irqrestore(ap->lock, flags);
778
779 /* Some PMPs require hardreset sequence to get
780 * SError.N working.
781 */
782 sata_link_hardreset(link, sata_deb_timing_normal,
783 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
784 NULL, NULL);
785
786 /* unconditionally clear SError.N */
787 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
788 if (rc) {
789 ata_link_printk(link, KERN_ERR, "failed to clear "
790 "SError.N (errno=%d)\n", rc);
791 return rc;
792 }
793
794 spin_lock_irqsave(ap->lock, flags);
795 }
796
797 spin_unlock_irqrestore(ap->lock, flags);
798
799 return 0;
800 }
801
802 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
803 {
804 struct ata_port *ap = link->ap;
805 unsigned long flags;
806
807 if (link_tries[link->pmp] && --link_tries[link->pmp])
808 return 1;
809
810 /* disable this link */
811 if (!(link->flags & ATA_LFLAG_DISABLED)) {
812 ata_link_printk(link, KERN_WARNING,
813 "failed to recover link after %d tries, disabling\n",
814 ATA_EH_PMP_LINK_TRIES);
815
816 spin_lock_irqsave(ap->lock, flags);
817 link->flags |= ATA_LFLAG_DISABLED;
818 spin_unlock_irqrestore(ap->lock, flags);
819 }
820
821 ata_dev_disable(link->device);
822 link->eh_context.i.action = 0;
823
824 return 0;
825 }
826
827 /**
828 * sata_pmp_eh_recover - recover PMP-enabled port
829 * @ap: ATA port to recover
830 *
831 * Drive EH recovery operation for PMP enabled port @ap. This
832 * function recovers host and PMP ports with proper retrials and
833 * fallbacks. Actual recovery operations are performed using
834 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
835 *
836 * LOCKING:
837 * Kernel thread context (may sleep).
838 *
839 * RETURNS:
840 * 0 on success, -errno on failure.
841 */
842 static int sata_pmp_eh_recover(struct ata_port *ap)
843 {
844 struct ata_port_operations *ops = ap->ops;
845 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
846 struct ata_link *pmp_link = &ap->link;
847 struct ata_device *pmp_dev = pmp_link->device;
848 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
849 u32 *gscr = pmp_dev->gscr;
850 struct ata_link *link;
851 struct ata_device *dev;
852 unsigned int err_mask;
853 u32 gscr_error, sntf;
854 int cnt, rc;
855
856 pmp_tries = ATA_EH_PMP_TRIES;
857 ata_for_each_link(link, ap, EDGE)
858 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
859
860 retry:
861 /* PMP attached? */
862 if (!sata_pmp_attached(ap)) {
863 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
864 ops->hardreset, ops->postreset, NULL);
865 if (rc) {
866 ata_for_each_dev(dev, &ap->link, ALL)
867 ata_dev_disable(dev);
868 return rc;
869 }
870
871 if (pmp_dev->class != ATA_DEV_PMP)
872 return 0;
873
874 /* new PMP online */
875 ata_for_each_link(link, ap, EDGE)
876 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
877
878 /* fall through */
879 }
880
881 /* recover pmp */
882 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
883 ops->hardreset, ops->postreset);
884 if (rc)
885 goto pmp_fail;
886
887 /* PHY event notification can disturb reset and other recovery
888 * operations. Turn it off.
889 */
890 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
891 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
892
893 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
894 gscr[SATA_PMP_GSCR_FEAT_EN]);
895 if (err_mask) {
896 ata_link_printk(pmp_link, KERN_WARNING,
897 "failed to disable NOTIFY (err_mask=0x%x)\n",
898 err_mask);
899 goto pmp_fail;
900 }
901 }
902
903 /* handle disabled links */
904 rc = sata_pmp_eh_handle_disabled_links(ap);
905 if (rc)
906 goto pmp_fail;
907
908 /* recover links */
909 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
910 ops->pmp_hardreset, ops->pmp_postreset, &link);
911 if (rc)
912 goto link_fail;
913
914 /* Connection status might have changed while resetting other
915 * links, check SATA_PMP_GSCR_ERROR before returning.
916 */
917
918 /* clear SNotification */
919 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
920 if (rc == 0)
921 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
922
923 /* enable notification */
924 if (pmp_dev->flags & ATA_DFLAG_AN) {
925 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
926
927 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
928 gscr[SATA_PMP_GSCR_FEAT_EN]);
929 if (err_mask) {
930 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
931 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
932 rc = -EIO;
933 goto pmp_fail;
934 }
935 }
936
937 /* check GSCR_ERROR */
938 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
939 if (err_mask) {
940 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
941 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
942 rc = -EIO;
943 goto pmp_fail;
944 }
945
946 cnt = 0;
947 ata_for_each_link(link, ap, EDGE) {
948 if (!(gscr_error & (1 << link->pmp)))
949 continue;
950
951 if (sata_pmp_handle_link_fail(link, link_tries)) {
952 ata_ehi_hotplugged(&link->eh_context.i);
953 cnt++;
954 } else {
955 ata_link_printk(link, KERN_WARNING,
956 "PHY status changed but maxed out on retries, "
957 "giving up\n");
958 ata_link_printk(link, KERN_WARNING,
959 "Manully issue scan to resume this link\n");
960 }
961 }
962
963 if (cnt) {
964 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
965 "ports, repeating recovery\n");
966 goto retry;
967 }
968
969 return 0;
970
971 link_fail:
972 if (sata_pmp_handle_link_fail(link, link_tries)) {
973 pmp_ehc->i.action |= ATA_EH_RESET;
974 goto retry;
975 }
976
977 /* fall through */
978 pmp_fail:
979 /* Control always ends up here after detaching PMP. Shut up
980 * and return if we're unloading.
981 */
982 if (ap->pflags & ATA_PFLAG_UNLOADING)
983 return rc;
984
985 if (!sata_pmp_attached(ap))
986 goto retry;
987
988 if (--pmp_tries) {
989 pmp_ehc->i.action |= ATA_EH_RESET;
990 goto retry;
991 }
992
993 ata_port_printk(ap, KERN_ERR,
994 "failed to recover PMP after %d tries, giving up\n",
995 ATA_EH_PMP_TRIES);
996 sata_pmp_detach(pmp_dev);
997 ata_dev_disable(pmp_dev);
998
999 return rc;
1000 }
1001
1002 /**
1003 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1004 * @ap: host port to handle error for
1005 *
1006 * Perform standard error handling sequence for PMP-enabled host
1007 * @ap.
1008 *
1009 * LOCKING:
1010 * Kernel thread context (may sleep).
1011 */
1012 void sata_pmp_error_handler(struct ata_port *ap)
1013 {
1014 ata_eh_autopsy(ap);
1015 ata_eh_report(ap);
1016 sata_pmp_eh_recover(ap);
1017 ata_eh_finish(ap);
1018 }
1019
1020 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1021 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1022 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
Linux for Ginger Game Console