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libata: separate PMP support code from core code
[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
48515f6c
TH		 14const 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
3af9a77a
TH		 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 *
b06ce3e5 28 * Read PMP register.
3af9a77a
TH		 29 *
30 * LOCKING:
31 * Kernel thread context (may sleep).
32 *
33 * RETURNS:
b06ce3e5 34 * 0 on success, AC_ERR_* mask on failure.
3af9a77a 35 */
b06ce3e5 36static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
3af9a77a
TH		 37{
38 struct ata_port *ap = link->ap;
39 struct ata_device *pmp_dev = ap->link.device;
b06ce3e5
TH		 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;
39f25e70 46 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
b06ce3e5
TH		 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_SCR_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;
3af9a77a
TH		 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 *
b06ce3e5 65 * Write PMP register.
3af9a77a
TH		 66 *
67 * LOCKING:
68 * Kernel thread context (may sleep).
69 *
70 * RETURNS:
b06ce3e5 71 * 0 on success, AC_ERR_* mask on failure.
3af9a77a 72 */
b06ce3e5 73static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
3af9a77a
TH		 74{
75 struct ata_port *ap = link->ap;
76 struct ata_device *pmp_dev = ap->link.device;
b06ce3e5
TH		 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;
39f25e70 82 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
b06ce3e5
TH		 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_SCR_TIMEOUT);
3af9a77a
TH		 92}
93
31f88384
TH		 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 */
107int 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
3af9a77a
TH		 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 */
139int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
140{
b06ce3e5
TH		 141 unsigned int err_mask;
142
3af9a77a
TH		 143 if (reg > SATA_PMP_PSCR_CONTROL)
144 return -EINVAL;
145
b06ce3e5
TH		 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;
3af9a77a
TH		 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 */
170int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
171{
b06ce3e5
TH		 172 unsigned int err_mask;
173
3af9a77a
TH		 174 if (reg > SATA_PMP_PSCR_CONTROL)
175 return -EINVAL;
176
b06ce3e5
TH		 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;
3af9a77a
TH		 184}
185
3af9a77a
TH		 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 */
200static 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 };
b06ce3e5 203 int i;
3af9a77a
TH		 204
205 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
206 int reg = gscr_to_read[i];
b06ce3e5 207 unsigned int err_mask;
3af9a77a 208
b06ce3e5
TH		 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;
3af9a77a
TH		 214 }
215 }
216
217 return 0;
218}
219
220static const char *sata_pmp_spec_rev_str(const u32 *gscr)
221{
222 u32 rev = gscr[SATA_PMP_GSCR_REV];
223
224 if (rev & (1 << 2))
225 return "1.1";
226 if (rev & (1 << 1))
227 return "1.0";
228 return "<unknown>";
229}
230
231static int sata_pmp_configure(struct ata_device *dev, int print_info)
232{
233 struct ata_port *ap = dev->link->ap;
234 u32 *gscr = dev->gscr;
b06ce3e5 235 unsigned int err_mask = 0;
3af9a77a
TH		 236 const char *reason;
237 int nr_ports, rc;
238
239 nr_ports = sata_pmp_gscr_ports(gscr);
240
241 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
242 rc = -EINVAL;
243 reason = "invalid nr_ports";
244 goto fail;
245 }
246
247 if ((ap->flags & ATA_FLAG_AN) &&
248 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
249 dev->flags |= ATA_DFLAG_AN;
250
251 /* monitor SERR_PHYRDY_CHG on fan-out ports */
b06ce3e5
TH		 252 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
253 SERR_PHYRDY_CHG);
254 if (err_mask) {
255 rc = -EIO;
3af9a77a
TH		 256 reason = "failed to write GSCR_ERROR_EN";
257 goto fail;
258 }
259
260 /* turn off notification till fan-out ports are reset and configured */
261 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
262 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
263
b06ce3e5
TH		 264 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN,
265 gscr[SATA_PMP_GSCR_FEAT_EN]);
266 if (err_mask) {
267 rc = -EIO;
3af9a77a
TH		 268 reason = "failed to write GSCR_FEAT_EN";
269 goto fail;
270 }
271 }
272
273 if (print_info) {
274 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
275 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
276 sata_pmp_spec_rev_str(gscr),
277 sata_pmp_gscr_vendor(gscr),
278 sata_pmp_gscr_devid(gscr),
279 sata_pmp_gscr_rev(gscr),
280 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
281 gscr[SATA_PMP_GSCR_FEAT]);
282
283 if (!(dev->flags & ATA_DFLAG_AN))
284 ata_dev_printk(dev, KERN_INFO,
285 "Asynchronous notification not supported, "
286 "hotplug won't\n work on fan-out "
287 "ports. Use warm-plug instead.\n");
288 }
289
290 return 0;
291
292 fail:
293 ata_dev_printk(dev, KERN_ERR,
b06ce3e5
TH		 294 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
295 reason, err_mask);
3af9a77a
TH		 296 return rc;
297}
298
299static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
300{
301 struct ata_link *pmp_link = ap->pmp_link;
302 int i;
303
304 if (!pmp_link) {
305 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
306 GFP_NOIO);
307 if (!pmp_link)
308 return -ENOMEM;
309
310 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
311 ata_link_init(ap, &pmp_link[i], i);
312
313 ap->pmp_link = pmp_link;
314 }
315
316 for (i = 0; i < nr_ports; i++) {
317 struct ata_link *link = &pmp_link[i];
318 struct ata_eh_context *ehc = &link->eh_context;
319
320 link->flags = 0;
b558eddd 321 ehc->i.probe_mask |= ATA_ALL_DEVICES;
cf480626 322 ehc->i.action |= ATA_EH_RESET;
3af9a77a
TH		 323 }
324
325 return 0;
326}
327
328static void sata_pmp_quirks(struct ata_port *ap)
329{
330 u32 *gscr = ap->link.device->gscr;
331 u16 vendor = sata_pmp_gscr_vendor(gscr);
332 u16 devid = sata_pmp_gscr_devid(gscr);
333 struct ata_link *link;
334
335 if (vendor == 0x1095 && devid == 0x3726) {
336 /* sil3726 quirks */
337 ata_port_for_each_link(link, ap) {
3af9a77a
TH		 338 /* class code report is unreliable */
339 if (link->pmp < 5)
340 link->flags |= ATA_LFLAG_ASSUME_ATA;
341
342 /* port 5 is for SEMB device and it doesn't like SRST */
343 if (link->pmp == 5)
344 link->flags |= ATA_LFLAG_NO_SRST |
345 ATA_LFLAG_ASSUME_SEMB;
346 }
347 } else if (vendor == 0x1095 && devid == 0x4723) {
348 /* sil4723 quirks */
349 ata_port_for_each_link(link, ap) {
3af9a77a
TH		 350 /* class code report is unreliable */
351 if (link->pmp < 2)
352 link->flags |= ATA_LFLAG_ASSUME_ATA;
353
354 /* the config device at port 2 locks up on SRST */
355 if (link->pmp == 2)
356 link->flags |= ATA_LFLAG_NO_SRST |
357 ATA_LFLAG_ASSUME_ATA;
358 }
359 } else if (vendor == 0x1095 && devid == 0x4726) {
360 /* sil4726 quirks */
361 ata_port_for_each_link(link, ap) {
8048307d
TH		 362 /* Class code report is unreliable and SRST
363 * times out under certain configurations.
364 * Config device can be at port 0 or 5 and
365 * locks up on SRST.
3af9a77a 366 */
8048307d 367 if (link->pmp <= 5)
3af9a77a
TH		 368 link->flags |= ATA_LFLAG_NO_SRST |
369 ATA_LFLAG_ASSUME_ATA;
370
371 /* Port 6 is for SEMB device which doesn't
372 * like SRST either.
373 */
374 if (link->pmp == 6)
375 link->flags |= ATA_LFLAG_NO_SRST |
376 ATA_LFLAG_ASSUME_SEMB;
377 }
378 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
379 devid == 0x5734 || devid == 0x5744)) {
380 /* sil5723/5744 quirks */
381
382 /* sil5723/5744 has either two or three downstream
383 * ports depending on operation mode. The last port
384 * is empty if any actual IO device is available or
385 * occupied by a pseudo configuration device
386 * otherwise. Don't try hard to recover it.
387 */
388 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
3af9a77a
TH		 389 }
390}
391
392/**
393 * sata_pmp_attach - attach a SATA PMP device
394 * @dev: SATA PMP device to attach
395 *
396 * Configure and attach SATA PMP device @dev. This function is
397 * also responsible for allocating and initializing PMP links.
398 *
399 * LOCKING:
400 * Kernel thread context (may sleep).
401 *
402 * RETURNS:
403 * 0 on success, -errno on failure.
404 */
405int sata_pmp_attach(struct ata_device *dev)
406{
407 struct ata_link *link = dev->link;
408 struct ata_port *ap = link->ap;
409 unsigned long flags;
410 struct ata_link *tlink;
411 int rc;
412
413 /* is it hanging off the right place? */
414 if (!(ap->flags & ATA_FLAG_PMP)) {
415 ata_dev_printk(dev, KERN_ERR,
416 "host does not support Port Multiplier\n");
417 return -EINVAL;
418 }
419
420 if (!ata_is_host_link(link)) {
421 ata_dev_printk(dev, KERN_ERR,
422 "Port Multipliers cannot be nested\n");
423 return -EINVAL;
424 }
425
426 if (dev->devno) {
427 ata_dev_printk(dev, KERN_ERR,
428 "Port Multiplier must be the first device\n");
429 return -EINVAL;
430 }
431
432 WARN_ON(link->pmp != 0);
433 link->pmp = SATA_PMP_CTRL_PORT;
434
435 /* read GSCR block */
436 rc = sata_pmp_read_gscr(dev, dev->gscr);
437 if (rc)
438 goto fail;
439
440 /* config PMP */
441 rc = sata_pmp_configure(dev, 1);
442 if (rc)
443 goto fail;
444
445 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
446 if (rc) {
447 ata_dev_printk(dev, KERN_INFO,
448 "failed to initialize PMP links\n");
449 goto fail;
450 }
451
452 /* attach it */
453 spin_lock_irqsave(ap->lock, flags);
454 WARN_ON(ap->nr_pmp_links);
455 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
456 spin_unlock_irqrestore(ap->lock, flags);
457
458 sata_pmp_quirks(ap);
459
460 if (ap->ops->pmp_attach)
461 ap->ops->pmp_attach(ap);
462
463 ata_port_for_each_link(tlink, ap)
464 sata_link_init_spd(tlink);
465
d0df8b5d
TH		 466 ata_acpi_associate_sata_port(ap);
467
3af9a77a
TH		 468 return 0;
469
470 fail:
471 link->pmp = 0;
472 return rc;
473}
474
475/**
476 * sata_pmp_detach - detach a SATA PMP device
477 * @dev: SATA PMP device to detach
478 *
479 * Detach SATA PMP device @dev. This function is also
480 * responsible for deconfiguring PMP links.
481 *
482 * LOCKING:
483 * Kernel thread context (may sleep).
484 */
485static void sata_pmp_detach(struct ata_device *dev)
486{
487 struct ata_link *link = dev->link;
488 struct ata_port *ap = link->ap;
489 struct ata_link *tlink;
490 unsigned long flags;
491
492 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
493
494 WARN_ON(!ata_is_host_link(link) || dev->devno ||
495 link->pmp != SATA_PMP_CTRL_PORT);
496
497 if (ap->ops->pmp_detach)
498 ap->ops->pmp_detach(ap);
499
500 ata_port_for_each_link(tlink, ap)
501 ata_eh_detach_dev(tlink->device);
502
503 spin_lock_irqsave(ap->lock, flags);
504 ap->nr_pmp_links = 0;
505 link->pmp = 0;
506 spin_unlock_irqrestore(ap->lock, flags);
d0df8b5d
TH		 507
508 ata_acpi_associate_sata_port(ap);
3af9a77a
TH		 509}
510
511/**
512 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
513 * @dev: PMP device to compare against
514 * @new_gscr: GSCR block of the new device
515 *
516 * Compare @new_gscr against @dev and determine whether @dev is
517 * the PMP described by @new_gscr.
518 *
519 * LOCKING:
520 * None.
521 *
522 * RETURNS:
523 * 1 if @dev matches @new_gscr, 0 otherwise.
524 */
525static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
526{
527 const u32 *old_gscr = dev->gscr;
528 u16 old_vendor, new_vendor, old_devid, new_devid;
529 int old_nr_ports, new_nr_ports;
530
531 old_vendor = sata_pmp_gscr_vendor(old_gscr);
532 new_vendor = sata_pmp_gscr_vendor(new_gscr);
533 old_devid = sata_pmp_gscr_devid(old_gscr);
534 new_devid = sata_pmp_gscr_devid(new_gscr);
535 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
536 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
537
538 if (old_vendor != new_vendor) {
539 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
540 "vendor mismatch '0x%x' != '0x%x'\n",
541 old_vendor, new_vendor);
542 return 0;
543 }
544
545 if (old_devid != new_devid) {
546 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
547 "device ID mismatch '0x%x' != '0x%x'\n",
548 old_devid, new_devid);
549 return 0;
550 }
551
552 if (old_nr_ports != new_nr_ports) {
553 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
554 "nr_ports mismatch '0x%x' != '0x%x'\n",
555 old_nr_ports, new_nr_ports);
556 return 0;
557 }
558
559 return 1;
560}
561
562/**
563 * sata_pmp_revalidate - revalidate SATA PMP
564 * @dev: PMP device to revalidate
565 * @new_class: new class code
566 *
567 * Re-read GSCR block and make sure @dev is still attached to the
568 * port and properly configured.
569 *
570 * LOCKING:
571 * Kernel thread context (may sleep).
572 *
573 * RETURNS:
574 * 0 on success, -errno otherwise.
575 */
576static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
577{
578 struct ata_link *link = dev->link;
579 struct ata_port *ap = link->ap;
580 u32 *gscr = (void *)ap->sector_buf;
581 int rc;
582
583 DPRINTK("ENTER\n");
584
585 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
586
587 if (!ata_dev_enabled(dev)) {
588 rc = -ENODEV;
589 goto fail;
590 }
591
592 /* wrong class? */
593 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
594 rc = -ENODEV;
595 goto fail;
596 }
597
598 /* read GSCR */
599 rc = sata_pmp_read_gscr(dev, gscr);
600 if (rc)
601 goto fail;
602
603 /* is the pmp still there? */
604 if (!sata_pmp_same_pmp(dev, gscr)) {
605 rc = -ENODEV;
606 goto fail;
607 }
608
609 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
610
611 rc = sata_pmp_configure(dev, 0);
612 if (rc)
613 goto fail;
614
615 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
616
617 DPRINTK("EXIT, rc=0\n");
618 return 0;
619
620 fail:
621 ata_dev_printk(dev, KERN_ERR,
622 "PMP revalidation failed (errno=%d)\n", rc);
623 DPRINTK("EXIT, rc=%d\n", rc);
624 return rc;
625}
626
627/**
628 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
629 * @dev: PMP device to revalidate
630 *
631 * Make sure the attached PMP is accessible.
632 *
633 * LOCKING:
634 * Kernel thread context (may sleep).
635 *
636 * RETURNS:
637 * 0 on success, -errno otherwise.
638 */
639static int sata_pmp_revalidate_quick(struct ata_device *dev)
640{
b06ce3e5 641 unsigned int err_mask;
3af9a77a 642 u32 prod_id;
3af9a77a 643
b06ce3e5
TH		 644 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
645 if (err_mask) {
646 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
647 "(Emask=0x%x)\n", err_mask);
648 return -EIO;
3af9a77a
TH		 649 }
650
651 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
652 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
653 /* something weird is going on, request full PMP recovery */
654 return -EIO;
655 }
656
657 return 0;
658}
659
660/**
661 * sata_pmp_eh_recover_pmp - recover PMP
662 * @ap: ATA port PMP is attached to
663 * @prereset: prereset method (can be NULL)
664 * @softreset: softreset method
665 * @hardreset: hardreset method
666 * @postreset: postreset method (can be NULL)
667 *
668 * Recover PMP attached to @ap. Recovery procedure is somewhat
669 * similar to that of ata_eh_recover() except that reset should
670 * always be performed in hard->soft sequence and recovery
671 * failure results in PMP detachment.
672 *
673 * LOCKING:
674 * Kernel thread context (may sleep).
675 *
676 * RETURNS:
677 * 0 on success, -errno on failure.
678 */
679static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
680 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
681 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
682{
683 struct ata_link *link = &ap->link;
684 struct ata_eh_context *ehc = &link->eh_context;
685 struct ata_device *dev = link->device;
686 int tries = ATA_EH_PMP_TRIES;
687 int detach = 0, rc = 0;
688 int reval_failed = 0;
689
690 DPRINTK("ENTER\n");
691
692 if (dev->flags & ATA_DFLAG_DETACH) {
693 detach = 1;
694 goto fail;
695 }
696
697 retry:
698 ehc->classes[0] = ATA_DEV_UNKNOWN;
699
cf480626 700 if (ehc->i.action & ATA_EH_RESET) {
3af9a77a
TH		 701 struct ata_link *tlink;
702
703 ata_eh_freeze_port(ap);
704
705 /* reset */
3af9a77a
TH		 706 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
707 postreset);
708 if (rc) {
709 ata_link_printk(link, KERN_ERR,
710 "failed to reset PMP, giving up\n");
711 goto fail;
712 }
713
714 ata_eh_thaw_port(ap);
715
716 /* PMP is reset, SErrors cannot be trusted, scan all */
b558eddd
TH		 717 ata_port_for_each_link(tlink, ap) {
718 struct ata_eh_context *ehc = &tlink->eh_context;
719
720 ehc->i.probe_mask |= ATA_ALL_DEVICES;
721 ehc->i.action |= ATA_EH_RESET;
722 }
3af9a77a
TH		 723 }
724
725 /* If revalidation is requested, revalidate and reconfigure;
726 * otherwise, do quick revalidation.
727 */
728 if (ehc->i.action & ATA_EH_REVALIDATE)
729 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
730 else
731 rc = sata_pmp_revalidate_quick(dev);
732
733 if (rc) {
734 tries--;
735
736 if (rc == -ENODEV) {
b558eddd 737 ehc->i.probe_mask |= ATA_ALL_DEVICES;
3af9a77a
TH		 738 detach = 1;
739 /* give it just two more chances */
740 tries = min(tries, 2);
741 }
742
743 if (tries) {
744 int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
745
746 /* consecutive revalidation failures? speed down */
747 if (reval_failed)
748 sata_down_spd_limit(link);
749 else
750 reval_failed = 1;
751
752 ata_dev_printk(dev, KERN_WARNING,
cf480626 753 "retrying reset%s\n",
3af9a77a
TH		 754 sleep ? " in 5 secs" : "");
755 if (sleep)
756 ssleep(5);
cf480626 757 ehc->i.action |= ATA_EH_RESET;
3af9a77a
TH		 758 goto retry;
759 } else {
760 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
761 "after %d tries, giving up\n",
762 ATA_EH_PMP_TRIES);
763 goto fail;
764 }
765 }
766
767 /* okay, PMP resurrected */
768 ehc->i.flags = 0;
769
770 DPRINTK("EXIT, rc=0\n");
771 return 0;
772
773 fail:
774 sata_pmp_detach(dev);
775 if (detach)
776 ata_eh_detach_dev(dev);
777 else
778 ata_dev_disable(dev);
779
780 DPRINTK("EXIT, rc=%d\n", rc);
781 return rc;
782}
783
784static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
785{
786 struct ata_link *link;
787 unsigned long flags;
788 int rc;
789
790 spin_lock_irqsave(ap->lock, flags);
791
792 ata_port_for_each_link(link, ap) {
793 if (!(link->flags & ATA_LFLAG_DISABLED))
794 continue;
795
796 spin_unlock_irqrestore(ap->lock, flags);
797
798 /* Some PMPs require hardreset sequence to get
799 * SError.N working.
800 */
cf480626 801 sata_link_hardreset(link, sata_deb_timing_normal,
9dadd45b 802 jiffies + ATA_TMOUT_INTERNAL_QUICK, NULL, NULL);
3af9a77a
TH		 803
804 /* unconditionally clear SError.N */
805 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
806 if (rc) {
807 ata_link_printk(link, KERN_ERR, "failed to clear "
808 "SError.N (errno=%d)\n", rc);
809 return rc;
810 }
811
812 spin_lock_irqsave(ap->lock, flags);
813 }
814
815 spin_unlock_irqrestore(ap->lock, flags);
816
817 return 0;
818}
819
820static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
821{
822 struct ata_port *ap = link->ap;
823 unsigned long flags;
824
825 if (link_tries[link->pmp] && --link_tries[link->pmp])
826 return 1;
827
828 /* disable this link */
829 if (!(link->flags & ATA_LFLAG_DISABLED)) {
830 ata_link_printk(link, KERN_WARNING,
831 "failed to recover link after %d tries, disabling\n",
832 ATA_EH_PMP_LINK_TRIES);
833
834 spin_lock_irqsave(ap->lock, flags);
835 link->flags |= ATA_LFLAG_DISABLED;
836 spin_unlock_irqrestore(ap->lock, flags);
837 }
838
839 ata_dev_disable(link->device);
840 link->eh_context.i.action = 0;
841
842 return 0;
843}
844
845/**
846 * sata_pmp_eh_recover - recover PMP-enabled port
847 * @ap: ATA port to recover
3af9a77a
TH		 848 *
849 * Drive EH recovery operation for PMP enabled port @ap. This
850 * function recovers host and PMP ports with proper retrials and
851 * fallbacks. Actual recovery operations are performed using
852 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
853 *
854 * LOCKING:
855 * Kernel thread context (may sleep).
856 *
857 * RETURNS:
858 * 0 on success, -errno on failure.
859 */
a1efdaba 860static int sata_pmp_eh_recover(struct ata_port *ap)
3af9a77a 861{
a1efdaba 862 struct ata_port_operations *ops = ap->ops;
3af9a77a
TH		 863 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
864 struct ata_link *pmp_link = &ap->link;
865 struct ata_device *pmp_dev = pmp_link->device;
866 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
867 struct ata_link *link;
868 struct ata_device *dev;
b06ce3e5 869 unsigned int err_mask;
3af9a77a
TH		 870 u32 gscr_error, sntf;
871 int cnt, rc;
872
873 pmp_tries = ATA_EH_PMP_TRIES;
874 ata_port_for_each_link(link, ap)
875 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
876
877 retry:
878 /* PMP attached? */
879 if (!ap->nr_pmp_links) {
a1efdaba
TH		 880 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
881 ops->hardreset, ops->postreset, NULL);
3af9a77a
TH		 882 if (rc) {
883 ata_link_for_each_dev(dev, &ap->link)
884 ata_dev_disable(dev);
885 return rc;
886 }
887
888 if (pmp_dev->class != ATA_DEV_PMP)
889 return 0;
890
891 /* new PMP online */
892 ata_port_for_each_link(link, ap)
893 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
894
895 /* fall through */
896 }
897
898 /* recover pmp */
a1efdaba
TH		 899 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
900 ops->hardreset, ops->postreset);
3af9a77a
TH		 901 if (rc)
902 goto pmp_fail;
903
904 /* handle disabled links */
905 rc = sata_pmp_eh_handle_disabled_links(ap);
906 if (rc)
907 goto pmp_fail;
908
909 /* recover links */
a1efdaba
TH		 910 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
911 ops->pmp_hardreset, ops->pmp_postreset, &link);
3af9a77a
TH		 912 if (rc)
913 goto link_fail;
914
915 /* Connection status might have changed while resetting other
916 * links, check SATA_PMP_GSCR_ERROR before returning.
917 */
918
919 /* clear SNotification */
920 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
921 if (rc == 0)
922 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
923
924 /* enable notification */
925 if (pmp_dev->flags & ATA_DFLAG_AN) {
926 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
927
b06ce3e5
TH		 928 err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN,
929 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]);
930 if (err_mask) {
931 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
932 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
933 rc = -EIO;
3af9a77a
TH		 934 goto pmp_fail;
935 }
936 }
937
938 /* check GSCR_ERROR */
b06ce3e5
TH		 939 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
940 if (err_mask) {
941 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
942 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
943 rc = -EIO;
3af9a77a
TH		 944 goto pmp_fail;
945 }
946
947 cnt = 0;
948 ata_port_for_each_link(link, ap) {
949 if (!(gscr_error & (1 << link->pmp)))
950 continue;
951
952 if (sata_pmp_handle_link_fail(link, link_tries)) {
953 ata_ehi_hotplugged(&link->eh_context.i);
954 cnt++;
955 } else {
956 ata_link_printk(link, KERN_WARNING,
957 "PHY status changed but maxed out on retries, "
958 "giving up\n");
959 ata_link_printk(link, KERN_WARNING,
960 "Manully issue scan to resume this link\n");
961 }
962 }
963
964 if (cnt) {
965 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
966 "ports, repeating recovery\n");
967 goto retry;
968 }
969
970 return 0;
971
972 link_fail:
973 if (sata_pmp_handle_link_fail(link, link_tries)) {
cf480626 974 pmp_ehc->i.action |= ATA_EH_RESET;
3af9a77a
TH		 975 goto retry;
976 }
977
978 /* fall through */
979 pmp_fail:
980 /* Control always ends up here after detaching PMP. Shut up
981 * and return if we're unloading.
982 */
983 if (ap->pflags & ATA_PFLAG_UNLOADING)
984 return rc;
985
986 if (!ap->nr_pmp_links)
987 goto retry;
988
989 if (--pmp_tries) {
990 ata_port_printk(ap, KERN_WARNING,
991 "failed to recover PMP, retrying in 5 secs\n");
cf480626 992 pmp_ehc->i.action |= ATA_EH_RESET;
3af9a77a
TH		 993 ssleep(5);
994 goto retry;
995 }
996
997 ata_port_printk(ap, KERN_ERR,
998 "failed to recover PMP after %d tries, giving up\n",
999 ATA_EH_PMP_TRIES);
1000 sata_pmp_detach(pmp_dev);
1001 ata_dev_disable(pmp_dev);
1002
1003 return rc;
1004}
1005
1006/**
a1efdaba 1007 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
3af9a77a 1008 * @ap: host port to handle error for
3af9a77a
TH		 1009 *
1010 * Perform standard error handling sequence for PMP-enabled host
1011 * @ap.
1012 *
1013 * LOCKING:
1014 * Kernel thread context (may sleep).
1015 */
a1efdaba 1016void sata_pmp_error_handler(struct ata_port *ap)
3af9a77a
TH		 1017{
1018 ata_eh_autopsy(ap);
1019 ata_eh_report(ap);
a1efdaba 1020 sata_pmp_eh_recover(ap);
3af9a77a
TH		 1021 ata_eh_finish(ap);
1022}
48515f6c
TH		 1023
1024EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1025EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1026EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
kernel source for telekom puls (alcatel/mediatek)