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Add linux-next specific files for 20110801
[linux-2.6/next.git] / drivers / ata / libahci.c
blob3c92dbd751e0d287e2c124aa28e828ef46ad1858
1 /*
2 * libahci.c - Common AHCI SATA low-level routines
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2004-2005 Red Hat, Inc.
9 *
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 *
26 * libata documentation is available via 'make {ps|pdf}docs',
27 * as Documentation/DocBook/libata.*
28 *
29 * AHCI hardware documentation:
30 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
31 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
32 *
33 */
34
35 #include <linux/kernel.h>
36 #include <linux/gfp.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/blkdev.h>
40 #include <linux/delay.h>
41 #include <linux/interrupt.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/device.h>
44 #include <scsi/scsi_host.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <linux/libata.h>
47 #include "ahci.h"
48
49 static int ahci_skip_host_reset;
50 int ahci_ignore_sss;
51 EXPORT_SYMBOL_GPL(ahci_ignore_sss);
52
53 module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
54 MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
55
56 module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
57 MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
58
59 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
60 unsigned hints);
61 static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
62 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
63 size_t size);
64 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
65 ssize_t size);
66
67
68
69 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
70 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
71 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
72 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
73 static int ahci_port_start(struct ata_port *ap);
74 static void ahci_port_stop(struct ata_port *ap);
75 static void ahci_qc_prep(struct ata_queued_cmd *qc);
76 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
77 static void ahci_freeze(struct ata_port *ap);
78 static void ahci_thaw(struct ata_port *ap);
79 static void ahci_enable_fbs(struct ata_port *ap);
80 static void ahci_disable_fbs(struct ata_port *ap);
81 static void ahci_pmp_attach(struct ata_port *ap);
82 static void ahci_pmp_detach(struct ata_port *ap);
83 static int ahci_softreset(struct ata_link *link, unsigned int *class,
84 unsigned long deadline);
85 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
86 unsigned long deadline);
87 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
88 unsigned long deadline);
89 static void ahci_postreset(struct ata_link *link, unsigned int *class);
90 static void ahci_error_handler(struct ata_port *ap);
91 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
92 static void ahci_dev_config(struct ata_device *dev);
93 #ifdef CONFIG_PM
94 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
95 #endif
96 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
97 static ssize_t ahci_activity_store(struct ata_device *dev,
98 enum sw_activity val);
99 static void ahci_init_sw_activity(struct ata_link *link);
100
101 static ssize_t ahci_show_host_caps(struct device *dev,
102 struct device_attribute *attr, char *buf);
103 static ssize_t ahci_show_host_cap2(struct device *dev,
104 struct device_attribute *attr, char *buf);
105 static ssize_t ahci_show_host_version(struct device *dev,
106 struct device_attribute *attr, char *buf);
107 static ssize_t ahci_show_port_cmd(struct device *dev,
108 struct device_attribute *attr, char *buf);
109 static ssize_t ahci_read_em_buffer(struct device *dev,
110 struct device_attribute *attr, char *buf);
111 static ssize_t ahci_store_em_buffer(struct device *dev,
112 struct device_attribute *attr,
113 const char *buf, size_t size);
114 static ssize_t ahci_show_em_supported(struct device *dev,
115 struct device_attribute *attr, char *buf);
116
117 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
118 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
119 static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
120 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
121 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
122 ahci_read_em_buffer, ahci_store_em_buffer);
123 static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
124
125 struct device_attribute *ahci_shost_attrs[] = {
126 &dev_attr_link_power_management_policy,
127 &dev_attr_em_message_type,
128 &dev_attr_em_message,
129 &dev_attr_ahci_host_caps,
130 &dev_attr_ahci_host_cap2,
131 &dev_attr_ahci_host_version,
132 &dev_attr_ahci_port_cmd,
133 &dev_attr_em_buffer,
134 &dev_attr_em_message_supported,
135 NULL
136 };
137 EXPORT_SYMBOL_GPL(ahci_shost_attrs);
138
139 struct device_attribute *ahci_sdev_attrs[] = {
140 &dev_attr_sw_activity,
141 &dev_attr_unload_heads,
142 NULL
143 };
144 EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
145
146 struct ata_port_operations ahci_ops = {
147 .inherits = &sata_pmp_port_ops,
148
149 .qc_defer = ahci_pmp_qc_defer,
150 .qc_prep = ahci_qc_prep,
151 .qc_issue = ahci_qc_issue,
152 .qc_fill_rtf = ahci_qc_fill_rtf,
153
154 .freeze = ahci_freeze,
155 .thaw = ahci_thaw,
156 .softreset = ahci_softreset,
157 .hardreset = ahci_hardreset,
158 .postreset = ahci_postreset,
159 .pmp_softreset = ahci_softreset,
160 .error_handler = ahci_error_handler,
161 .post_internal_cmd = ahci_post_internal_cmd,
162 .dev_config = ahci_dev_config,
163
164 .scr_read = ahci_scr_read,
165 .scr_write = ahci_scr_write,
166 .pmp_attach = ahci_pmp_attach,
167 .pmp_detach = ahci_pmp_detach,
168
169 .set_lpm = ahci_set_lpm,
170 .em_show = ahci_led_show,
171 .em_store = ahci_led_store,
172 .sw_activity_show = ahci_activity_show,
173 .sw_activity_store = ahci_activity_store,
174 #ifdef CONFIG_PM
175 .port_suspend = ahci_port_suspend,
176 .port_resume = ahci_port_resume,
177 #endif
178 .port_start = ahci_port_start,
179 .port_stop = ahci_port_stop,
180 };
181 EXPORT_SYMBOL_GPL(ahci_ops);
182
183 struct ata_port_operations ahci_pmp_retry_srst_ops = {
184 .inherits = &ahci_ops,
185 .softreset = ahci_pmp_retry_softreset,
186 };
187 EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
188
189 int ahci_em_messages = 1;
190 EXPORT_SYMBOL_GPL(ahci_em_messages);
191 module_param(ahci_em_messages, int, 0444);
192 /* add other LED protocol types when they become supported */
193 MODULE_PARM_DESC(ahci_em_messages,
194 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
195
196 static void ahci_enable_ahci(void __iomem *mmio)
197 {
198 int i;
199 u32 tmp;
200
201 /* turn on AHCI_EN */
202 tmp = readl(mmio + HOST_CTL);
203 if (tmp & HOST_AHCI_EN)
204 return;
205
206 /* Some controllers need AHCI_EN to be written multiple times.
207 * Try a few times before giving up.
208 */
209 for (i = 0; i < 5; i++) {
210 tmp |= HOST_AHCI_EN;
211 writel(tmp, mmio + HOST_CTL);
212 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
213 if (tmp & HOST_AHCI_EN)
214 return;
215 msleep(10);
216 }
217
218 WARN_ON(1);
219 }
220
221 static ssize_t ahci_show_host_caps(struct device *dev,
222 struct device_attribute *attr, char *buf)
223 {
224 struct Scsi_Host *shost = class_to_shost(dev);
225 struct ata_port *ap = ata_shost_to_port(shost);
226 struct ahci_host_priv *hpriv = ap->host->private_data;
227
228 return sprintf(buf, "%x\n", hpriv->cap);
229 }
230
231 static ssize_t ahci_show_host_cap2(struct device *dev,
232 struct device_attribute *attr, char *buf)
233 {
234 struct Scsi_Host *shost = class_to_shost(dev);
235 struct ata_port *ap = ata_shost_to_port(shost);
236 struct ahci_host_priv *hpriv = ap->host->private_data;
237
238 return sprintf(buf, "%x\n", hpriv->cap2);
239 }
240
241 static ssize_t ahci_show_host_version(struct device *dev,
242 struct device_attribute *attr, char *buf)
243 {
244 struct Scsi_Host *shost = class_to_shost(dev);
245 struct ata_port *ap = ata_shost_to_port(shost);
246 struct ahci_host_priv *hpriv = ap->host->private_data;
247 void __iomem *mmio = hpriv->mmio;
248
249 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
250 }
251
252 static ssize_t ahci_show_port_cmd(struct device *dev,
253 struct device_attribute *attr, char *buf)
254 {
255 struct Scsi_Host *shost = class_to_shost(dev);
256 struct ata_port *ap = ata_shost_to_port(shost);
257 void __iomem *port_mmio = ahci_port_base(ap);
258
259 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
260 }
261
262 static ssize_t ahci_read_em_buffer(struct device *dev,
263 struct device_attribute *attr, char *buf)
264 {
265 struct Scsi_Host *shost = class_to_shost(dev);
266 struct ata_port *ap = ata_shost_to_port(shost);
267 struct ahci_host_priv *hpriv = ap->host->private_data;
268 void __iomem *mmio = hpriv->mmio;
269 void __iomem *em_mmio = mmio + hpriv->em_loc;
270 u32 em_ctl, msg;
271 unsigned long flags;
272 size_t count;
273 int i;
274
275 spin_lock_irqsave(ap->lock, flags);
276
277 em_ctl = readl(mmio + HOST_EM_CTL);
278 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
279 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
280 spin_unlock_irqrestore(ap->lock, flags);
281 return -EINVAL;
282 }
283
284 if (!(em_ctl & EM_CTL_MR)) {
285 spin_unlock_irqrestore(ap->lock, flags);
286 return -EAGAIN;
287 }
288
289 if (!(em_ctl & EM_CTL_SMB))
290 em_mmio += hpriv->em_buf_sz;
291
292 count = hpriv->em_buf_sz;
293
294 /* the count should not be larger than PAGE_SIZE */
295 if (count > PAGE_SIZE) {
296 if (printk_ratelimit())
297 ata_port_warn(ap,
298 "EM read buffer size too large: "
299 "buffer size %u, page size %lu\n",
300 hpriv->em_buf_sz, PAGE_SIZE);
301 count = PAGE_SIZE;
302 }
303
304 for (i = 0; i < count; i += 4) {
305 msg = readl(em_mmio + i);
306 buf[i] = msg & 0xff;
307 buf[i + 1] = (msg >> 8) & 0xff;
308 buf[i + 2] = (msg >> 16) & 0xff;
309 buf[i + 3] = (msg >> 24) & 0xff;
310 }
311
312 spin_unlock_irqrestore(ap->lock, flags);
313
314 return i;
315 }
316
317 static ssize_t ahci_store_em_buffer(struct device *dev,
318 struct device_attribute *attr,
319 const char *buf, size_t size)
320 {
321 struct Scsi_Host *shost = class_to_shost(dev);
322 struct ata_port *ap = ata_shost_to_port(shost);
323 struct ahci_host_priv *hpriv = ap->host->private_data;
324 void __iomem *mmio = hpriv->mmio;
325 void __iomem *em_mmio = mmio + hpriv->em_loc;
326 const unsigned char *msg_buf = buf;
327 u32 em_ctl, msg;
328 unsigned long flags;
329 int i;
330
331 /* check size validity */
332 if (!(ap->flags & ATA_FLAG_EM) ||
333 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
334 size % 4 || size > hpriv->em_buf_sz)
335 return -EINVAL;
336
337 spin_lock_irqsave(ap->lock, flags);
338
339 em_ctl = readl(mmio + HOST_EM_CTL);
340 if (em_ctl & EM_CTL_TM) {
341 spin_unlock_irqrestore(ap->lock, flags);
342 return -EBUSY;
343 }
344
345 for (i = 0; i < size; i += 4) {
346 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
347 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
348 writel(msg, em_mmio + i);
349 }
350
351 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
352
353 spin_unlock_irqrestore(ap->lock, flags);
354
355 return size;
356 }
357
358 static ssize_t ahci_show_em_supported(struct device *dev,
359 struct device_attribute *attr, char *buf)
360 {
361 struct Scsi_Host *shost = class_to_shost(dev);
362 struct ata_port *ap = ata_shost_to_port(shost);
363 struct ahci_host_priv *hpriv = ap->host->private_data;
364 void __iomem *mmio = hpriv->mmio;
365 u32 em_ctl;
366
367 em_ctl = readl(mmio + HOST_EM_CTL);
368
369 return sprintf(buf, "%s%s%s%s\n",
370 em_ctl & EM_CTL_LED ? "led " : "",
371 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
372 em_ctl & EM_CTL_SES ? "ses-2 " : "",
373 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
374 }
375
376 /**
377 * ahci_save_initial_config - Save and fixup initial config values
378 * @dev: target AHCI device
379 * @hpriv: host private area to store config values
380 * @force_port_map: force port map to a specified value
381 * @mask_port_map: mask out particular bits from port map
382 *
383 * Some registers containing configuration info might be setup by
384 * BIOS and might be cleared on reset. This function saves the
385 * initial values of those registers into @hpriv such that they
386 * can be restored after controller reset.
387 *
388 * If inconsistent, config values are fixed up by this function.
389 *
390 * LOCKING:
391 * None.
392 */
393 void ahci_save_initial_config(struct device *dev,
394 struct ahci_host_priv *hpriv,
395 unsigned int force_port_map,
396 unsigned int mask_port_map)
397 {
398 void __iomem *mmio = hpriv->mmio;
399 u32 cap, cap2, vers, port_map;
400 int i;
401
402 /* make sure AHCI mode is enabled before accessing CAP */
403 ahci_enable_ahci(mmio);
404
405 /* Values prefixed with saved_ are written back to host after
406 * reset. Values without are used for driver operation.
407 */
408 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
409 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
410
411 /* CAP2 register is only defined for AHCI 1.2 and later */
412 vers = readl(mmio + HOST_VERSION);
413 if ((vers >> 16) > 1 ||
414 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
415 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
416 else
417 hpriv->saved_cap2 = cap2 = 0;
418
419 /* some chips have errata preventing 64bit use */
420 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
421 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
422 cap &= ~HOST_CAP_64;
423 }
424
425 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
426 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
427 cap &= ~HOST_CAP_NCQ;
428 }
429
430 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
431 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
432 cap |= HOST_CAP_NCQ;
433 }
434
435 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
436 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
437 cap &= ~HOST_CAP_PMP;
438 }
439
440 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
441 dev_info(dev,
442 "controller can't do SNTF, turning off CAP_SNTF\n");
443 cap &= ~HOST_CAP_SNTF;
444 }
445
446 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
447 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
448 cap |= HOST_CAP_FBS;
449 }
450
451 if (force_port_map && port_map != force_port_map) {
452 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
453 port_map, force_port_map);
454 port_map = force_port_map;
455 }
456
457 if (mask_port_map) {
458 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
459 port_map,
460 port_map & mask_port_map);
461 port_map &= mask_port_map;
462 }
463
464 /* cross check port_map and cap.n_ports */
465 if (port_map) {
466 int map_ports = 0;
467
468 for (i = 0; i < AHCI_MAX_PORTS; i++)
469 if (port_map & (1 << i))
470 map_ports++;
471
472 /* If PI has more ports than n_ports, whine, clear
473 * port_map and let it be generated from n_ports.
474 */
475 if (map_ports > ahci_nr_ports(cap)) {
476 dev_warn(dev,
477 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
478 port_map, ahci_nr_ports(cap));
479 port_map = 0;
480 }
481 }
482
483 /* fabricate port_map from cap.nr_ports */
484 if (!port_map) {
485 port_map = (1 << ahci_nr_ports(cap)) - 1;
486 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
487
488 /* write the fixed up value to the PI register */
489 hpriv->saved_port_map = port_map;
490 }
491
492 /* record values to use during operation */
493 hpriv->cap = cap;
494 hpriv->cap2 = cap2;
495 hpriv->port_map = port_map;
496 }
497 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
498
499 /**
500 * ahci_restore_initial_config - Restore initial config
501 * @host: target ATA host
502 *
503 * Restore initial config stored by ahci_save_initial_config().
504 *
505 * LOCKING:
506 * None.
507 */
508 static void ahci_restore_initial_config(struct ata_host *host)
509 {
510 struct ahci_host_priv *hpriv = host->private_data;
511 void __iomem *mmio = hpriv->mmio;
512
513 writel(hpriv->saved_cap, mmio + HOST_CAP);
514 if (hpriv->saved_cap2)
515 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
516 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
517 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
518 }
519
520 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
521 {
522 static const int offset[] = {
523 [SCR_STATUS] = PORT_SCR_STAT,
524 [SCR_CONTROL] = PORT_SCR_CTL,
525 [SCR_ERROR] = PORT_SCR_ERR,
526 [SCR_ACTIVE] = PORT_SCR_ACT,
527 [SCR_NOTIFICATION] = PORT_SCR_NTF,
528 };
529 struct ahci_host_priv *hpriv = ap->host->private_data;
530
531 if (sc_reg < ARRAY_SIZE(offset) &&
532 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
533 return offset[sc_reg];
534 return 0;
535 }
536
537 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
538 {
539 void __iomem *port_mmio = ahci_port_base(link->ap);
540 int offset = ahci_scr_offset(link->ap, sc_reg);
541
542 if (offset) {
543 *val = readl(port_mmio + offset);
544 return 0;
545 }
546 return -EINVAL;
547 }
548
549 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
550 {
551 void __iomem *port_mmio = ahci_port_base(link->ap);
552 int offset = ahci_scr_offset(link->ap, sc_reg);
553
554 if (offset) {
555 writel(val, port_mmio + offset);
556 return 0;
557 }
558 return -EINVAL;
559 }
560
561 void ahci_start_engine(struct ata_port *ap)
562 {
563 void __iomem *port_mmio = ahci_port_base(ap);
564 u32 tmp;
565
566 /* start DMA */
567 tmp = readl(port_mmio + PORT_CMD);
568 tmp |= PORT_CMD_START;
569 writel(tmp, port_mmio + PORT_CMD);
570 readl(port_mmio + PORT_CMD); /* flush */
571 }
572 EXPORT_SYMBOL_GPL(ahci_start_engine);
573
574 int ahci_stop_engine(struct ata_port *ap)
575 {
576 void __iomem *port_mmio = ahci_port_base(ap);
577 u32 tmp;
578
579 tmp = readl(port_mmio + PORT_CMD);
580
581 /* check if the HBA is idle */
582 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
583 return 0;
584
585 /* setting HBA to idle */
586 tmp &= ~PORT_CMD_START;
587 writel(tmp, port_mmio + PORT_CMD);
588
589 /* wait for engine to stop. This could be as long as 500 msec */
590 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
591 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
592 if (tmp & PORT_CMD_LIST_ON)
593 return -EIO;
594
595 return 0;
596 }
597 EXPORT_SYMBOL_GPL(ahci_stop_engine);
598
599 static void ahci_start_fis_rx(struct ata_port *ap)
600 {
601 void __iomem *port_mmio = ahci_port_base(ap);
602 struct ahci_host_priv *hpriv = ap->host->private_data;
603 struct ahci_port_priv *pp = ap->private_data;
604 u32 tmp;
605
606 /* set FIS registers */
607 if (hpriv->cap & HOST_CAP_64)
608 writel((pp->cmd_slot_dma >> 16) >> 16,
609 port_mmio + PORT_LST_ADDR_HI);
610 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
611
612 if (hpriv->cap & HOST_CAP_64)
613 writel((pp->rx_fis_dma >> 16) >> 16,
614 port_mmio + PORT_FIS_ADDR_HI);
615 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
616
617 /* enable FIS reception */
618 tmp = readl(port_mmio + PORT_CMD);
619 tmp |= PORT_CMD_FIS_RX;
620 writel(tmp, port_mmio + PORT_CMD);
621
622 /* flush */
623 readl(port_mmio + PORT_CMD);
624 }
625
626 static int ahci_stop_fis_rx(struct ata_port *ap)
627 {
628 void __iomem *port_mmio = ahci_port_base(ap);
629 u32 tmp;
630
631 /* disable FIS reception */
632 tmp = readl(port_mmio + PORT_CMD);
633 tmp &= ~PORT_CMD_FIS_RX;
634 writel(tmp, port_mmio + PORT_CMD);
635
636 /* wait for completion, spec says 500ms, give it 1000 */
637 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
638 PORT_CMD_FIS_ON, 10, 1000);
639 if (tmp & PORT_CMD_FIS_ON)
640 return -EBUSY;
641
642 return 0;
643 }
644
645 static void ahci_power_up(struct ata_port *ap)
646 {
647 struct ahci_host_priv *hpriv = ap->host->private_data;
648 void __iomem *port_mmio = ahci_port_base(ap);
649 u32 cmd;
650
651 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
652
653 /* spin up device */
654 if (hpriv->cap & HOST_CAP_SSS) {
655 cmd |= PORT_CMD_SPIN_UP;
656 writel(cmd, port_mmio + PORT_CMD);
657 }
658
659 /* wake up link */
660 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
661 }
662
663 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
664 unsigned int hints)
665 {
666 struct ata_port *ap = link->ap;
667 struct ahci_host_priv *hpriv = ap->host->private_data;
668 struct ahci_port_priv *pp = ap->private_data;
669 void __iomem *port_mmio = ahci_port_base(ap);
670
671 if (policy != ATA_LPM_MAX_POWER) {
672 /*
673 * Disable interrupts on Phy Ready. This keeps us from
674 * getting woken up due to spurious phy ready
675 * interrupts.
676 */
677 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
678 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
679
680 sata_link_scr_lpm(link, policy, false);
681 }
682
683 if (hpriv->cap & HOST_CAP_ALPM) {
684 u32 cmd = readl(port_mmio + PORT_CMD);
685
686 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
687 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
688 cmd |= PORT_CMD_ICC_ACTIVE;
689
690 writel(cmd, port_mmio + PORT_CMD);
691 readl(port_mmio + PORT_CMD);
692
693 /* wait 10ms to be sure we've come out of LPM state */
694 ata_msleep(ap, 10);
695 } else {
696 cmd |= PORT_CMD_ALPE;
697 if (policy == ATA_LPM_MIN_POWER)
698 cmd |= PORT_CMD_ASP;
699
700 /* write out new cmd value */
701 writel(cmd, port_mmio + PORT_CMD);
702 }
703 }
704
705 if (policy == ATA_LPM_MAX_POWER) {
706 sata_link_scr_lpm(link, policy, false);
707
708 /* turn PHYRDY IRQ back on */
709 pp->intr_mask |= PORT_IRQ_PHYRDY;
710 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
711 }
712
713 return 0;
714 }
715
716 #ifdef CONFIG_PM
717 static void ahci_power_down(struct ata_port *ap)
718 {
719 struct ahci_host_priv *hpriv = ap->host->private_data;
720 void __iomem *port_mmio = ahci_port_base(ap);
721 u32 cmd, scontrol;
722
723 if (!(hpriv->cap & HOST_CAP_SSS))
724 return;
725
726 /* put device into listen mode, first set PxSCTL.DET to 0 */
727 scontrol = readl(port_mmio + PORT_SCR_CTL);
728 scontrol &= ~0xf;
729 writel(scontrol, port_mmio + PORT_SCR_CTL);
730
731 /* then set PxCMD.SUD to 0 */
732 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
733 cmd &= ~PORT_CMD_SPIN_UP;
734 writel(cmd, port_mmio + PORT_CMD);
735 }
736 #endif
737
738 static void ahci_start_port(struct ata_port *ap)
739 {
740 struct ahci_port_priv *pp = ap->private_data;
741 struct ata_link *link;
742 struct ahci_em_priv *emp;
743 ssize_t rc;
744 int i;
745
746 /* enable FIS reception */
747 ahci_start_fis_rx(ap);
748
749 /* enable DMA */
750 ahci_start_engine(ap);
751
752 /* turn on LEDs */
753 if (ap->flags & ATA_FLAG_EM) {
754 ata_for_each_link(link, ap, EDGE) {
755 emp = &pp->em_priv[link->pmp];
756
757 /* EM Transmit bit maybe busy during init */
758 for (i = 0; i < EM_MAX_RETRY; i++) {
759 rc = ahci_transmit_led_message(ap,
760 emp->led_state,
761 4);
762 if (rc == -EBUSY)
763 ata_msleep(ap, 1);
764 else
765 break;
766 }
767 }
768 }
769
770 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
771 ata_for_each_link(link, ap, EDGE)
772 ahci_init_sw_activity(link);
773
774 }
775
776 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
777 {
778 int rc;
779
780 /* disable DMA */
781 rc = ahci_stop_engine(ap);
782 if (rc) {
783 *emsg = "failed to stop engine";
784 return rc;
785 }
786
787 /* disable FIS reception */
788 rc = ahci_stop_fis_rx(ap);
789 if (rc) {
790 *emsg = "failed stop FIS RX";
791 return rc;
792 }
793
794 return 0;
795 }
796
797 int ahci_reset_controller(struct ata_host *host)
798 {
799 struct ahci_host_priv *hpriv = host->private_data;
800 void __iomem *mmio = hpriv->mmio;
801 u32 tmp;
802
803 /* we must be in AHCI mode, before using anything
804 * AHCI-specific, such as HOST_RESET.
805 */
806 ahci_enable_ahci(mmio);
807
808 /* global controller reset */
809 if (!ahci_skip_host_reset) {
810 tmp = readl(mmio + HOST_CTL);
811 if ((tmp & HOST_RESET) == 0) {
812 writel(tmp | HOST_RESET, mmio + HOST_CTL);
813 readl(mmio + HOST_CTL); /* flush */
814 }
815
816 /*
817 * to perform host reset, OS should set HOST_RESET
818 * and poll until this bit is read to be "0".
819 * reset must complete within 1 second, or
820 * the hardware should be considered fried.
821 */
822 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
823 HOST_RESET, 10, 1000);
824
825 if (tmp & HOST_RESET) {
826 dev_err(host->dev, "controller reset failed (0x%x)\n",
827 tmp);
828 return -EIO;
829 }
830
831 /* turn on AHCI mode */
832 ahci_enable_ahci(mmio);
833
834 /* Some registers might be cleared on reset. Restore
835 * initial values.
836 */
837 ahci_restore_initial_config(host);
838 } else
839 dev_info(host->dev, "skipping global host reset\n");
840
841 return 0;
842 }
843 EXPORT_SYMBOL_GPL(ahci_reset_controller);
844
845 static void ahci_sw_activity(struct ata_link *link)
846 {
847 struct ata_port *ap = link->ap;
848 struct ahci_port_priv *pp = ap->private_data;
849 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
850
851 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
852 return;
853
854 emp->activity++;
855 if (!timer_pending(&emp->timer))
856 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
857 }
858
859 static void ahci_sw_activity_blink(unsigned long arg)
860 {
861 struct ata_link *link = (struct ata_link *)arg;
862 struct ata_port *ap = link->ap;
863 struct ahci_port_priv *pp = ap->private_data;
864 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
865 unsigned long led_message = emp->led_state;
866 u32 activity_led_state;
867 unsigned long flags;
868
869 led_message &= EM_MSG_LED_VALUE;
870 led_message |= ap->port_no | (link->pmp << 8);
871
872 /* check to see if we've had activity. If so,
873 * toggle state of LED and reset timer. If not,
874 * turn LED to desired idle state.
875 */
876 spin_lock_irqsave(ap->lock, flags);
877 if (emp->saved_activity != emp->activity) {
878 emp->saved_activity = emp->activity;
879 /* get the current LED state */
880 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
881
882 if (activity_led_state)
883 activity_led_state = 0;
884 else
885 activity_led_state = 1;
886
887 /* clear old state */
888 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
889
890 /* toggle state */
891 led_message |= (activity_led_state << 16);
892 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
893 } else {
894 /* switch to idle */
895 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
896 if (emp->blink_policy == BLINK_OFF)
897 led_message |= (1 << 16);
898 }
899 spin_unlock_irqrestore(ap->lock, flags);
900 ahci_transmit_led_message(ap, led_message, 4);
901 }
902
903 static void ahci_init_sw_activity(struct ata_link *link)
904 {
905 struct ata_port *ap = link->ap;
906 struct ahci_port_priv *pp = ap->private_data;
907 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
908
909 /* init activity stats, setup timer */
910 emp->saved_activity = emp->activity = 0;
911 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
912
913 /* check our blink policy and set flag for link if it's enabled */
914 if (emp->blink_policy)
915 link->flags |= ATA_LFLAG_SW_ACTIVITY;
916 }
917
918 int ahci_reset_em(struct ata_host *host)
919 {
920 struct ahci_host_priv *hpriv = host->private_data;
921 void __iomem *mmio = hpriv->mmio;
922 u32 em_ctl;
923
924 em_ctl = readl(mmio + HOST_EM_CTL);
925 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
926 return -EINVAL;
927
928 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
929 return 0;
930 }
931 EXPORT_SYMBOL_GPL(ahci_reset_em);
932
933 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
934 ssize_t size)
935 {
936 struct ahci_host_priv *hpriv = ap->host->private_data;
937 struct ahci_port_priv *pp = ap->private_data;
938 void __iomem *mmio = hpriv->mmio;
939 u32 em_ctl;
940 u32 message[] = {0, 0};
941 unsigned long flags;
942 int pmp;
943 struct ahci_em_priv *emp;
944
945 /* get the slot number from the message */
946 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
947 if (pmp < EM_MAX_SLOTS)
948 emp = &pp->em_priv[pmp];
949 else
950 return -EINVAL;
951
952 spin_lock_irqsave(ap->lock, flags);
953
954 /*
955 * if we are still busy transmitting a previous message,
956 * do not allow
957 */
958 em_ctl = readl(mmio + HOST_EM_CTL);
959 if (em_ctl & EM_CTL_TM) {
960 spin_unlock_irqrestore(ap->lock, flags);
961 return -EBUSY;
962 }
963
964 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
965 /*
966 * create message header - this is all zero except for
967 * the message size, which is 4 bytes.
968 */
969 message[0] |= (4 << 8);
970
971 /* ignore 0:4 of byte zero, fill in port info yourself */
972 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
973
974 /* write message to EM_LOC */
975 writel(message[0], mmio + hpriv->em_loc);
976 writel(message[1], mmio + hpriv->em_loc+4);
977
978 /*
979 * tell hardware to transmit the message
980 */
981 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
982 }
983
984 /* save off new led state for port/slot */
985 emp->led_state = state;
986
987 spin_unlock_irqrestore(ap->lock, flags);
988 return size;
989 }
990
991 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
992 {
993 struct ahci_port_priv *pp = ap->private_data;
994 struct ata_link *link;
995 struct ahci_em_priv *emp;
996 int rc = 0;
997
998 ata_for_each_link(link, ap, EDGE) {
999 emp = &pp->em_priv[link->pmp];
1000 rc += sprintf(buf, "%lx\n", emp->led_state);
1001 }
1002 return rc;
1003 }
1004
1005 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1006 size_t size)
1007 {
1008 int state;
1009 int pmp;
1010 struct ahci_port_priv *pp = ap->private_data;
1011 struct ahci_em_priv *emp;
1012
1013 state = simple_strtoul(buf, NULL, 0);
1014
1015 /* get the slot number from the message */
1016 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1017 if (pmp < EM_MAX_SLOTS)
1018 emp = &pp->em_priv[pmp];
1019 else
1020 return -EINVAL;
1021
1022 /* mask off the activity bits if we are in sw_activity
1023 * mode, user should turn off sw_activity before setting
1024 * activity led through em_message
1025 */
1026 if (emp->blink_policy)
1027 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1028
1029 return ahci_transmit_led_message(ap, state, size);
1030 }
1031
1032 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1033 {
1034 struct ata_link *link = dev->link;
1035 struct ata_port *ap = link->ap;
1036 struct ahci_port_priv *pp = ap->private_data;
1037 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1038 u32 port_led_state = emp->led_state;
1039
1040 /* save the desired Activity LED behavior */
1041 if (val == OFF) {
1042 /* clear LFLAG */
1043 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1044
1045 /* set the LED to OFF */
1046 port_led_state &= EM_MSG_LED_VALUE_OFF;
1047 port_led_state |= (ap->port_no | (link->pmp << 8));
1048 ahci_transmit_led_message(ap, port_led_state, 4);
1049 } else {
1050 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1051 if (val == BLINK_OFF) {
1052 /* set LED to ON for idle */
1053 port_led_state &= EM_MSG_LED_VALUE_OFF;
1054 port_led_state |= (ap->port_no | (link->pmp << 8));
1055 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1056 ahci_transmit_led_message(ap, port_led_state, 4);
1057 }
1058 }
1059 emp->blink_policy = val;
1060 return 0;
1061 }
1062
1063 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1064 {
1065 struct ata_link *link = dev->link;
1066 struct ata_port *ap = link->ap;
1067 struct ahci_port_priv *pp = ap->private_data;
1068 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1069
1070 /* display the saved value of activity behavior for this
1071 * disk.
1072 */
1073 return sprintf(buf, "%d\n", emp->blink_policy);
1074 }
1075
1076 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1077 int port_no, void __iomem *mmio,
1078 void __iomem *port_mmio)
1079 {
1080 const char *emsg = NULL;
1081 int rc;
1082 u32 tmp;
1083
1084 /* make sure port is not active */
1085 rc = ahci_deinit_port(ap, &emsg);
1086 if (rc)
1087 dev_warn(dev, "%s (%d)\n", emsg, rc);
1088
1089 /* clear SError */
1090 tmp = readl(port_mmio + PORT_SCR_ERR);
1091 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1092 writel(tmp, port_mmio + PORT_SCR_ERR);
1093
1094 /* clear port IRQ */
1095 tmp = readl(port_mmio + PORT_IRQ_STAT);
1096 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1097 if (tmp)
1098 writel(tmp, port_mmio + PORT_IRQ_STAT);
1099
1100 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1101 }
1102
1103 void ahci_init_controller(struct ata_host *host)
1104 {
1105 struct ahci_host_priv *hpriv = host->private_data;
1106 void __iomem *mmio = hpriv->mmio;
1107 int i;
1108 void __iomem *port_mmio;
1109 u32 tmp;
1110
1111 for (i = 0; i < host->n_ports; i++) {
1112 struct ata_port *ap = host->ports[i];
1113
1114 port_mmio = ahci_port_base(ap);
1115 if (ata_port_is_dummy(ap))
1116 continue;
1117
1118 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1119 }
1120
1121 tmp = readl(mmio + HOST_CTL);
1122 VPRINTK("HOST_CTL 0x%x\n", tmp);
1123 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1124 tmp = readl(mmio + HOST_CTL);
1125 VPRINTK("HOST_CTL 0x%x\n", tmp);
1126 }
1127 EXPORT_SYMBOL_GPL(ahci_init_controller);
1128
1129 static void ahci_dev_config(struct ata_device *dev)
1130 {
1131 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1132
1133 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1134 dev->max_sectors = 255;
1135 ata_dev_info(dev,
1136 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1137 }
1138 }
1139
1140 static unsigned int ahci_dev_classify(struct ata_port *ap)
1141 {
1142 void __iomem *port_mmio = ahci_port_base(ap);
1143 struct ata_taskfile tf;
1144 u32 tmp;
1145
1146 tmp = readl(port_mmio + PORT_SIG);
1147 tf.lbah = (tmp >> 24) & 0xff;
1148 tf.lbam = (tmp >> 16) & 0xff;
1149 tf.lbal = (tmp >> 8) & 0xff;
1150 tf.nsect = (tmp) & 0xff;
1151
1152 return ata_dev_classify(&tf);
1153 }
1154
1155 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1156 u32 opts)
1157 {
1158 dma_addr_t cmd_tbl_dma;
1159
1160 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1161
1162 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1163 pp->cmd_slot[tag].status = 0;
1164 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1165 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1166 }
1167 EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1168
1169 int ahci_kick_engine(struct ata_port *ap)
1170 {
1171 void __iomem *port_mmio = ahci_port_base(ap);
1172 struct ahci_host_priv *hpriv = ap->host->private_data;
1173 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1174 u32 tmp;
1175 int busy, rc;
1176
1177 /* stop engine */
1178 rc = ahci_stop_engine(ap);
1179 if (rc)
1180 goto out_restart;
1181
1182 /* need to do CLO?
1183 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1184 */
1185 busy = status & (ATA_BUSY | ATA_DRQ);
1186 if (!busy && !sata_pmp_attached(ap)) {
1187 rc = 0;
1188 goto out_restart;
1189 }
1190
1191 if (!(hpriv->cap & HOST_CAP_CLO)) {
1192 rc = -EOPNOTSUPP;
1193 goto out_restart;
1194 }
1195
1196 /* perform CLO */
1197 tmp = readl(port_mmio + PORT_CMD);
1198 tmp |= PORT_CMD_CLO;
1199 writel(tmp, port_mmio + PORT_CMD);
1200
1201 rc = 0;
1202 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1203 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1204 if (tmp & PORT_CMD_CLO)
1205 rc = -EIO;
1206
1207 /* restart engine */
1208 out_restart:
1209 ahci_start_engine(ap);
1210 return rc;
1211 }
1212 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1213
1214 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1215 struct ata_taskfile *tf, int is_cmd, u16 flags,
1216 unsigned long timeout_msec)
1217 {
1218 const u32 cmd_fis_len = 5; /* five dwords */
1219 struct ahci_port_priv *pp = ap->private_data;
1220 void __iomem *port_mmio = ahci_port_base(ap);
1221 u8 *fis = pp->cmd_tbl;
1222 u32 tmp;
1223
1224 /* prep the command */
1225 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1226 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1227
1228 /* issue & wait */
1229 writel(1, port_mmio + PORT_CMD_ISSUE);
1230
1231 if (timeout_msec) {
1232 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1233 0x1, 0x1, 1, timeout_msec);
1234 if (tmp & 0x1) {
1235 ahci_kick_engine(ap);
1236 return -EBUSY;
1237 }
1238 } else
1239 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1240
1241 return 0;
1242 }
1243
1244 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1245 int pmp, unsigned long deadline,
1246 int (*check_ready)(struct ata_link *link))
1247 {
1248 struct ata_port *ap = link->ap;
1249 struct ahci_host_priv *hpriv = ap->host->private_data;
1250 const char *reason = NULL;
1251 unsigned long now, msecs;
1252 struct ata_taskfile tf;
1253 int rc;
1254
1255 DPRINTK("ENTER\n");
1256
1257 /* prepare for SRST (AHCI-1.1 10.4.1) */
1258 rc = ahci_kick_engine(ap);
1259 if (rc && rc != -EOPNOTSUPP)
1260 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1261
1262 ata_tf_init(link->device, &tf);
1263
1264 /* issue the first D2H Register FIS */
1265 msecs = 0;
1266 now = jiffies;
1267 if (time_after(deadline, now))
1268 msecs = jiffies_to_msecs(deadline - now);
1269
1270 tf.ctl |= ATA_SRST;
1271 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1272 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1273 rc = -EIO;
1274 reason = "1st FIS failed";
1275 goto fail;
1276 }
1277
1278 /* spec says at least 5us, but be generous and sleep for 1ms */
1279 ata_msleep(ap, 1);
1280
1281 /* issue the second D2H Register FIS */
1282 tf.ctl &= ~ATA_SRST;
1283 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1284
1285 /* wait for link to become ready */
1286 rc = ata_wait_after_reset(link, deadline, check_ready);
1287 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1288 /*
1289 * Workaround for cases where link online status can't
1290 * be trusted. Treat device readiness timeout as link
1291 * offline.
1292 */
1293 ata_link_info(link, "device not ready, treating as offline\n");
1294 *class = ATA_DEV_NONE;
1295 } else if (rc) {
1296 /* link occupied, -ENODEV too is an error */
1297 reason = "device not ready";
1298 goto fail;
1299 } else
1300 *class = ahci_dev_classify(ap);
1301
1302 DPRINTK("EXIT, class=%u\n", *class);
1303 return 0;
1304
1305 fail:
1306 ata_link_err(link, "softreset failed (%s)\n", reason);
1307 return rc;
1308 }
1309
1310 int ahci_check_ready(struct ata_link *link)
1311 {
1312 void __iomem *port_mmio = ahci_port_base(link->ap);
1313 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1314
1315 return ata_check_ready(status);
1316 }
1317 EXPORT_SYMBOL_GPL(ahci_check_ready);
1318
1319 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1320 unsigned long deadline)
1321 {
1322 int pmp = sata_srst_pmp(link);
1323
1324 DPRINTK("ENTER\n");
1325
1326 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1327 }
1328 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1329
1330 static int ahci_bad_pmp_check_ready(struct ata_link *link)
1331 {
1332 void __iomem *port_mmio = ahci_port_base(link->ap);
1333 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1334 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1335
1336 /*
1337 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1338 * which can save timeout delay.
1339 */
1340 if (irq_status & PORT_IRQ_BAD_PMP)
1341 return -EIO;
1342
1343 return ata_check_ready(status);
1344 }
1345
1346 int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1347 unsigned long deadline)
1348 {
1349 struct ata_port *ap = link->ap;
1350 void __iomem *port_mmio = ahci_port_base(ap);
1351 int pmp = sata_srst_pmp(link);
1352 int rc;
1353 u32 irq_sts;
1354
1355 DPRINTK("ENTER\n");
1356
1357 rc = ahci_do_softreset(link, class, pmp, deadline,
1358 ahci_bad_pmp_check_ready);
1359
1360 /*
1361 * Soft reset fails with IPMS set when PMP is enabled but
1362 * SATA HDD/ODD is connected to SATA port, do soft reset
1363 * again to port 0.
1364 */
1365 if (rc == -EIO) {
1366 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1367 if (irq_sts & PORT_IRQ_BAD_PMP) {
1368 ata_link_printk(link, KERN_WARNING,
1369 "applying PMP SRST workaround "
1370 "and retrying\n");
1371 rc = ahci_do_softreset(link, class, 0, deadline,
1372 ahci_check_ready);
1373 }
1374 }
1375
1376 return rc;
1377 }
1378
1379 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1380 unsigned long deadline)
1381 {
1382 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1383 struct ata_port *ap = link->ap;
1384 struct ahci_port_priv *pp = ap->private_data;
1385 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1386 struct ata_taskfile tf;
1387 bool online;
1388 int rc;
1389
1390 DPRINTK("ENTER\n");
1391
1392 ahci_stop_engine(ap);
1393
1394 /* clear D2H reception area to properly wait for D2H FIS */
1395 ata_tf_init(link->device, &tf);
1396 tf.command = 0x80;
1397 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1398
1399 rc = sata_link_hardreset(link, timing, deadline, &online,
1400 ahci_check_ready);
1401
1402 ahci_start_engine(ap);
1403
1404 if (online)
1405 *class = ahci_dev_classify(ap);
1406
1407 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1408 return rc;
1409 }
1410
1411 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1412 {
1413 struct ata_port *ap = link->ap;
1414 void __iomem *port_mmio = ahci_port_base(ap);
1415 u32 new_tmp, tmp;
1416
1417 ata_std_postreset(link, class);
1418
1419 /* Make sure port's ATAPI bit is set appropriately */
1420 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1421 if (*class == ATA_DEV_ATAPI)
1422 new_tmp |= PORT_CMD_ATAPI;
1423 else
1424 new_tmp &= ~PORT_CMD_ATAPI;
1425 if (new_tmp != tmp) {
1426 writel(new_tmp, port_mmio + PORT_CMD);
1427 readl(port_mmio + PORT_CMD); /* flush */
1428 }
1429 }
1430
1431 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1432 {
1433 struct scatterlist *sg;
1434 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1435 unsigned int si;
1436
1437 VPRINTK("ENTER\n");
1438
1439 /*
1440 * Next, the S/G list.
1441 */
1442 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1443 dma_addr_t addr = sg_dma_address(sg);
1444 u32 sg_len = sg_dma_len(sg);
1445
1446 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1447 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1448 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1449 }
1450
1451 return si;
1452 }
1453
1454 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1455 {
1456 struct ata_port *ap = qc->ap;
1457 struct ahci_port_priv *pp = ap->private_data;
1458
1459 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1460 return ata_std_qc_defer(qc);
1461 else
1462 return sata_pmp_qc_defer_cmd_switch(qc);
1463 }
1464
1465 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1466 {
1467 struct ata_port *ap = qc->ap;
1468 struct ahci_port_priv *pp = ap->private_data;
1469 int is_atapi = ata_is_atapi(qc->tf.protocol);
1470 void *cmd_tbl;
1471 u32 opts;
1472 const u32 cmd_fis_len = 5; /* five dwords */
1473 unsigned int n_elem;
1474
1475 /*
1476 * Fill in command table information. First, the header,
1477 * a SATA Register - Host to Device command FIS.
1478 */
1479 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1480
1481 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1482 if (is_atapi) {
1483 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1484 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1485 }
1486
1487 n_elem = 0;
1488 if (qc->flags & ATA_QCFLAG_DMAMAP)
1489 n_elem = ahci_fill_sg(qc, cmd_tbl);
1490
1491 /*
1492 * Fill in command slot information.
1493 */
1494 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1495 if (qc->tf.flags & ATA_TFLAG_WRITE)
1496 opts |= AHCI_CMD_WRITE;
1497 if (is_atapi)
1498 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1499
1500 ahci_fill_cmd_slot(pp, qc->tag, opts);
1501 }
1502
1503 static void ahci_fbs_dec_intr(struct ata_port *ap)
1504 {
1505 struct ahci_port_priv *pp = ap->private_data;
1506 void __iomem *port_mmio = ahci_port_base(ap);
1507 u32 fbs = readl(port_mmio + PORT_FBS);
1508 int retries = 3;
1509
1510 DPRINTK("ENTER\n");
1511 BUG_ON(!pp->fbs_enabled);
1512
1513 /* time to wait for DEC is not specified by AHCI spec,
1514 * add a retry loop for safety.
1515 */
1516 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1517 fbs = readl(port_mmio + PORT_FBS);
1518 while ((fbs & PORT_FBS_DEC) && retries--) {
1519 udelay(1);
1520 fbs = readl(port_mmio + PORT_FBS);
1521 }
1522
1523 if (fbs & PORT_FBS_DEC)
1524 dev_err(ap->host->dev, "failed to clear device error\n");
1525 }
1526
1527 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1528 {
1529 struct ahci_host_priv *hpriv = ap->host->private_data;
1530 struct ahci_port_priv *pp = ap->private_data;
1531 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1532 struct ata_link *link = NULL;
1533 struct ata_queued_cmd *active_qc;
1534 struct ata_eh_info *active_ehi;
1535 bool fbs_need_dec = false;
1536 u32 serror;
1537
1538 /* determine active link with error */
1539 if (pp->fbs_enabled) {
1540 void __iomem *port_mmio = ahci_port_base(ap);
1541 u32 fbs = readl(port_mmio + PORT_FBS);
1542 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1543
1544 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1545 ata_link_online(&ap->pmp_link[pmp])) {
1546 link = &ap->pmp_link[pmp];
1547 fbs_need_dec = true;
1548 }
1549
1550 } else
1551 ata_for_each_link(link, ap, EDGE)
1552 if (ata_link_active(link))
1553 break;
1554
1555 if (!link)
1556 link = &ap->link;
1557
1558 active_qc = ata_qc_from_tag(ap, link->active_tag);
1559 active_ehi = &link->eh_info;
1560
1561 /* record irq stat */
1562 ata_ehi_clear_desc(host_ehi);
1563 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1564
1565 /* AHCI needs SError cleared; otherwise, it might lock up */
1566 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1567 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1568 host_ehi->serror |= serror;
1569
1570 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1571 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1572 irq_stat &= ~PORT_IRQ_IF_ERR;
1573
1574 if (irq_stat & PORT_IRQ_TF_ERR) {
1575 /* If qc is active, charge it; otherwise, the active
1576 * link. There's no active qc on NCQ errors. It will
1577 * be determined by EH by reading log page 10h.
1578 */
1579 if (active_qc)
1580 active_qc->err_mask |= AC_ERR_DEV;
1581 else
1582 active_ehi->err_mask |= AC_ERR_DEV;
1583
1584 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1585 host_ehi->serror &= ~SERR_INTERNAL;
1586 }
1587
1588 if (irq_stat & PORT_IRQ_UNK_FIS) {
1589 u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1590
1591 active_ehi->err_mask |= AC_ERR_HSM;
1592 active_ehi->action |= ATA_EH_RESET;
1593 ata_ehi_push_desc(active_ehi,
1594 "unknown FIS %08x %08x %08x %08x" ,
1595 unk[0], unk[1], unk[2], unk[3]);
1596 }
1597
1598 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1599 active_ehi->err_mask |= AC_ERR_HSM;
1600 active_ehi->action |= ATA_EH_RESET;
1601 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1602 }
1603
1604 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1605 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1606 host_ehi->action |= ATA_EH_RESET;
1607 ata_ehi_push_desc(host_ehi, "host bus error");
1608 }
1609
1610 if (irq_stat & PORT_IRQ_IF_ERR) {
1611 if (fbs_need_dec)
1612 active_ehi->err_mask |= AC_ERR_DEV;
1613 else {
1614 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1615 host_ehi->action |= ATA_EH_RESET;
1616 }
1617
1618 ata_ehi_push_desc(host_ehi, "interface fatal error");
1619 }
1620
1621 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1622 ata_ehi_hotplugged(host_ehi);
1623 ata_ehi_push_desc(host_ehi, "%s",
1624 irq_stat & PORT_IRQ_CONNECT ?
1625 "connection status changed" : "PHY RDY changed");
1626 }
1627
1628 /* okay, let's hand over to EH */
1629
1630 if (irq_stat & PORT_IRQ_FREEZE)
1631 ata_port_freeze(ap);
1632 else if (fbs_need_dec) {
1633 ata_link_abort(link);
1634 ahci_fbs_dec_intr(ap);
1635 } else
1636 ata_port_abort(ap);
1637 }
1638
1639 static void ahci_port_intr(struct ata_port *ap)
1640 {
1641 void __iomem *port_mmio = ahci_port_base(ap);
1642 struct ata_eh_info *ehi = &ap->link.eh_info;
1643 struct ahci_port_priv *pp = ap->private_data;
1644 struct ahci_host_priv *hpriv = ap->host->private_data;
1645 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1646 u32 status, qc_active = 0;
1647 int rc;
1648
1649 status = readl(port_mmio + PORT_IRQ_STAT);
1650 writel(status, port_mmio + PORT_IRQ_STAT);
1651
1652 /* ignore BAD_PMP while resetting */
1653 if (unlikely(resetting))
1654 status &= ~PORT_IRQ_BAD_PMP;
1655
1656 /* if LPM is enabled, PHYRDY doesn't mean anything */
1657 if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
1658 status &= ~PORT_IRQ_PHYRDY;
1659 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1660 }
1661
1662 if (unlikely(status & PORT_IRQ_ERROR)) {
1663 ahci_error_intr(ap, status);
1664 return;
1665 }
1666
1667 if (status & PORT_IRQ_SDB_FIS) {
1668 /* If SNotification is available, leave notification
1669 * handling to sata_async_notification(). If not,
1670 * emulate it by snooping SDB FIS RX area.
1671 *
1672 * Snooping FIS RX area is probably cheaper than
1673 * poking SNotification but some constrollers which
1674 * implement SNotification, ICH9 for example, don't
1675 * store AN SDB FIS into receive area.
1676 */
1677 if (hpriv->cap & HOST_CAP_SNTF)
1678 sata_async_notification(ap);
1679 else {
1680 /* If the 'N' bit in word 0 of the FIS is set,
1681 * we just received asynchronous notification.
1682 * Tell libata about it.
1683 *
1684 * Lack of SNotification should not appear in
1685 * ahci 1.2, so the workaround is unnecessary
1686 * when FBS is enabled.
1687 */
1688 if (pp->fbs_enabled)
1689 WARN_ON_ONCE(1);
1690 else {
1691 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1692 u32 f0 = le32_to_cpu(f[0]);
1693 if (f0 & (1 << 15))
1694 sata_async_notification(ap);
1695 }
1696 }
1697 }
1698
1699 /* pp->active_link is not reliable once FBS is enabled, both
1700 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1701 * NCQ and non-NCQ commands may be in flight at the same time.
1702 */
1703 if (pp->fbs_enabled) {
1704 if (ap->qc_active) {
1705 qc_active = readl(port_mmio + PORT_SCR_ACT);
1706 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1707 }
1708 } else {
1709 /* pp->active_link is valid iff any command is in flight */
1710 if (ap->qc_active && pp->active_link->sactive)
1711 qc_active = readl(port_mmio + PORT_SCR_ACT);
1712 else
1713 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1714 }
1715
1716
1717 rc = ata_qc_complete_multiple(ap, qc_active);
1718
1719 /* while resetting, invalid completions are expected */
1720 if (unlikely(rc < 0 && !resetting)) {
1721 ehi->err_mask |= AC_ERR_HSM;
1722 ehi->action |= ATA_EH_RESET;
1723 ata_port_freeze(ap);
1724 }
1725 }
1726
1727 irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1728 {
1729 struct ata_host *host = dev_instance;
1730 struct ahci_host_priv *hpriv;
1731 unsigned int i, handled = 0;
1732 void __iomem *mmio;
1733 u32 irq_stat, irq_masked;
1734
1735 VPRINTK("ENTER\n");
1736
1737 hpriv = host->private_data;
1738 mmio = hpriv->mmio;
1739
1740 /* sigh. 0xffffffff is a valid return from h/w */
1741 irq_stat = readl(mmio + HOST_IRQ_STAT);
1742 if (!irq_stat)
1743 return IRQ_NONE;
1744
1745 irq_masked = irq_stat & hpriv->port_map;
1746
1747 spin_lock(&host->lock);
1748
1749 for (i = 0; i < host->n_ports; i++) {
1750 struct ata_port *ap;
1751
1752 if (!(irq_masked & (1 << i)))
1753 continue;
1754
1755 ap = host->ports[i];
1756 if (ap) {
1757 ahci_port_intr(ap);
1758 VPRINTK("port %u\n", i);
1759 } else {
1760 VPRINTK("port %u (no irq)\n", i);
1761 if (ata_ratelimit())
1762 dev_warn(host->dev,
1763 "interrupt on disabled port %u\n", i);
1764 }
1765
1766 handled = 1;
1767 }
1768
1769 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1770 * it should be cleared after all the port events are cleared;
1771 * otherwise, it will raise a spurious interrupt after each
1772 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1773 * information.
1774 *
1775 * Also, use the unmasked value to clear interrupt as spurious
1776 * pending event on a dummy port might cause screaming IRQ.
1777 */
1778 writel(irq_stat, mmio + HOST_IRQ_STAT);
1779
1780 spin_unlock(&host->lock);
1781
1782 VPRINTK("EXIT\n");
1783
1784 return IRQ_RETVAL(handled);
1785 }
1786 EXPORT_SYMBOL_GPL(ahci_interrupt);
1787
1788 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1789 {
1790 struct ata_port *ap = qc->ap;
1791 void __iomem *port_mmio = ahci_port_base(ap);
1792 struct ahci_port_priv *pp = ap->private_data;
1793
1794 /* Keep track of the currently active link. It will be used
1795 * in completion path to determine whether NCQ phase is in
1796 * progress.
1797 */
1798 pp->active_link = qc->dev->link;
1799
1800 if (qc->tf.protocol == ATA_PROT_NCQ)
1801 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1802
1803 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1804 u32 fbs = readl(port_mmio + PORT_FBS);
1805 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1806 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1807 writel(fbs, port_mmio + PORT_FBS);
1808 pp->fbs_last_dev = qc->dev->link->pmp;
1809 }
1810
1811 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1812
1813 ahci_sw_activity(qc->dev->link);
1814
1815 return 0;
1816 }
1817
1818 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1819 {
1820 struct ahci_port_priv *pp = qc->ap->private_data;
1821 u8 *rx_fis = pp->rx_fis;
1822
1823 if (pp->fbs_enabled)
1824 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1825
1826 /*
1827 * After a successful execution of an ATA PIO data-in command,
1828 * the device doesn't send D2H Reg FIS to update the TF and
1829 * the host should take TF and E_Status from the preceding PIO
1830 * Setup FIS.
1831 */
1832 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1833 !(qc->flags & ATA_QCFLAG_FAILED)) {
1834 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1835 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1836 } else
1837 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1838
1839 return true;
1840 }
1841
1842 static void ahci_freeze(struct ata_port *ap)
1843 {
1844 void __iomem *port_mmio = ahci_port_base(ap);
1845
1846 /* turn IRQ off */
1847 writel(0, port_mmio + PORT_IRQ_MASK);
1848 }
1849
1850 static void ahci_thaw(struct ata_port *ap)
1851 {
1852 struct ahci_host_priv *hpriv = ap->host->private_data;
1853 void __iomem *mmio = hpriv->mmio;
1854 void __iomem *port_mmio = ahci_port_base(ap);
1855 u32 tmp;
1856 struct ahci_port_priv *pp = ap->private_data;
1857
1858 /* clear IRQ */
1859 tmp = readl(port_mmio + PORT_IRQ_STAT);
1860 writel(tmp, port_mmio + PORT_IRQ_STAT);
1861 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1862
1863 /* turn IRQ back on */
1864 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1865 }
1866
1867 static void ahci_error_handler(struct ata_port *ap)
1868 {
1869 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1870 /* restart engine */
1871 ahci_stop_engine(ap);
1872 ahci_start_engine(ap);
1873 }
1874
1875 sata_pmp_error_handler(ap);
1876
1877 if (!ata_dev_enabled(ap->link.device))
1878 ahci_stop_engine(ap);
1879 }
1880
1881 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1882 {
1883 struct ata_port *ap = qc->ap;
1884
1885 /* make DMA engine forget about the failed command */
1886 if (qc->flags & ATA_QCFLAG_FAILED)
1887 ahci_kick_engine(ap);
1888 }
1889
1890 static void ahci_enable_fbs(struct ata_port *ap)
1891 {
1892 struct ahci_port_priv *pp = ap->private_data;
1893 void __iomem *port_mmio = ahci_port_base(ap);
1894 u32 fbs;
1895 int rc;
1896
1897 if (!pp->fbs_supported)
1898 return;
1899
1900 fbs = readl(port_mmio + PORT_FBS);
1901 if (fbs & PORT_FBS_EN) {
1902 pp->fbs_enabled = true;
1903 pp->fbs_last_dev = -1; /* initialization */
1904 return;
1905 }
1906
1907 rc = ahci_stop_engine(ap);
1908 if (rc)
1909 return;
1910
1911 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
1912 fbs = readl(port_mmio + PORT_FBS);
1913 if (fbs & PORT_FBS_EN) {
1914 dev_info(ap->host->dev, "FBS is enabled\n");
1915 pp->fbs_enabled = true;
1916 pp->fbs_last_dev = -1; /* initialization */
1917 } else
1918 dev_err(ap->host->dev, "Failed to enable FBS\n");
1919
1920 ahci_start_engine(ap);
1921 }
1922
1923 static void ahci_disable_fbs(struct ata_port *ap)
1924 {
1925 struct ahci_port_priv *pp = ap->private_data;
1926 void __iomem *port_mmio = ahci_port_base(ap);
1927 u32 fbs;
1928 int rc;
1929
1930 if (!pp->fbs_supported)
1931 return;
1932
1933 fbs = readl(port_mmio + PORT_FBS);
1934 if ((fbs & PORT_FBS_EN) == 0) {
1935 pp->fbs_enabled = false;
1936 return;
1937 }
1938
1939 rc = ahci_stop_engine(ap);
1940 if (rc)
1941 return;
1942
1943 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
1944 fbs = readl(port_mmio + PORT_FBS);
1945 if (fbs & PORT_FBS_EN)
1946 dev_err(ap->host->dev, "Failed to disable FBS\n");
1947 else {
1948 dev_info(ap->host->dev, "FBS is disabled\n");
1949 pp->fbs_enabled = false;
1950 }
1951
1952 ahci_start_engine(ap);
1953 }
1954
1955 static void ahci_pmp_attach(struct ata_port *ap)
1956 {
1957 void __iomem *port_mmio = ahci_port_base(ap);
1958 struct ahci_port_priv *pp = ap->private_data;
1959 u32 cmd;
1960
1961 cmd = readl(port_mmio + PORT_CMD);
1962 cmd |= PORT_CMD_PMP;
1963 writel(cmd, port_mmio + PORT_CMD);
1964
1965 ahci_enable_fbs(ap);
1966
1967 pp->intr_mask |= PORT_IRQ_BAD_PMP;
1968
1969 /*
1970 * We must not change the port interrupt mask register if the
1971 * port is marked frozen, the value in pp->intr_mask will be
1972 * restored later when the port is thawed.
1973 *
1974 * Note that during initialization, the port is marked as
1975 * frozen since the irq handler is not yet registered.
1976 */
1977 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1978 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1979 }
1980
1981 static void ahci_pmp_detach(struct ata_port *ap)
1982 {
1983 void __iomem *port_mmio = ahci_port_base(ap);
1984 struct ahci_port_priv *pp = ap->private_data;
1985 u32 cmd;
1986
1987 ahci_disable_fbs(ap);
1988
1989 cmd = readl(port_mmio + PORT_CMD);
1990 cmd &= ~PORT_CMD_PMP;
1991 writel(cmd, port_mmio + PORT_CMD);
1992
1993 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
1994
1995 /* see comment above in ahci_pmp_attach() */
1996 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1997 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1998 }
1999
2000 int ahci_port_resume(struct ata_port *ap)
2001 {
2002 ahci_power_up(ap);
2003 ahci_start_port(ap);
2004
2005 if (sata_pmp_attached(ap))
2006 ahci_pmp_attach(ap);
2007 else
2008 ahci_pmp_detach(ap);
2009
2010 return 0;
2011 }
2012 EXPORT_SYMBOL_GPL(ahci_port_resume);
2013
2014 #ifdef CONFIG_PM
2015 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2016 {
2017 const char *emsg = NULL;
2018 int rc;
2019
2020 rc = ahci_deinit_port(ap, &emsg);
2021 if (rc == 0)
2022 ahci_power_down(ap);
2023 else {
2024 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2025 ahci_start_port(ap);
2026 }
2027
2028 return rc;
2029 }
2030 #endif
2031
2032 static int ahci_port_start(struct ata_port *ap)
2033 {
2034 struct ahci_host_priv *hpriv = ap->host->private_data;
2035 struct device *dev = ap->host->dev;
2036 struct ahci_port_priv *pp;
2037 void *mem;
2038 dma_addr_t mem_dma;
2039 size_t dma_sz, rx_fis_sz;
2040
2041 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2042 if (!pp)
2043 return -ENOMEM;
2044
2045 /* check FBS capability */
2046 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2047 void __iomem *port_mmio = ahci_port_base(ap);
2048 u32 cmd = readl(port_mmio + PORT_CMD);
2049 if (cmd & PORT_CMD_FBSCP)
2050 pp->fbs_supported = true;
2051 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2052 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2053 ap->port_no);
2054 pp->fbs_supported = true;
2055 } else
2056 dev_warn(dev, "port %d is not capable of FBS\n",
2057 ap->port_no);
2058 }
2059
2060 if (pp->fbs_supported) {
2061 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2062 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2063 } else {
2064 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2065 rx_fis_sz = AHCI_RX_FIS_SZ;
2066 }
2067
2068 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2069 if (!mem)
2070 return -ENOMEM;
2071 memset(mem, 0, dma_sz);
2072
2073 /*
2074 * First item in chunk of DMA memory: 32-slot command table,
2075 * 32 bytes each in size
2076 */
2077 pp->cmd_slot = mem;
2078 pp->cmd_slot_dma = mem_dma;
2079
2080 mem += AHCI_CMD_SLOT_SZ;
2081 mem_dma += AHCI_CMD_SLOT_SZ;
2082
2083 /*
2084 * Second item: Received-FIS area
2085 */
2086 pp->rx_fis = mem;
2087 pp->rx_fis_dma = mem_dma;
2088
2089 mem += rx_fis_sz;
2090 mem_dma += rx_fis_sz;
2091
2092 /*
2093 * Third item: data area for storing a single command
2094 * and its scatter-gather table
2095 */
2096 pp->cmd_tbl = mem;
2097 pp->cmd_tbl_dma = mem_dma;
2098
2099 /*
2100 * Save off initial list of interrupts to be enabled.
2101 * This could be changed later
2102 */
2103 pp->intr_mask = DEF_PORT_IRQ;
2104
2105 ap->private_data = pp;
2106
2107 /* engage engines, captain */
2108 return ahci_port_resume(ap);
2109 }
2110
2111 static void ahci_port_stop(struct ata_port *ap)
2112 {
2113 const char *emsg = NULL;
2114 int rc;
2115
2116 /* de-initialize port */
2117 rc = ahci_deinit_port(ap, &emsg);
2118 if (rc)
2119 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2120 }
2121
2122 void ahci_print_info(struct ata_host *host, const char *scc_s)
2123 {
2124 struct ahci_host_priv *hpriv = host->private_data;
2125 void __iomem *mmio = hpriv->mmio;
2126 u32 vers, cap, cap2, impl, speed;
2127 const char *speed_s;
2128
2129 vers = readl(mmio + HOST_VERSION);
2130 cap = hpriv->cap;
2131 cap2 = hpriv->cap2;
2132 impl = hpriv->port_map;
2133
2134 speed = (cap >> 20) & 0xf;
2135 if (speed == 1)
2136 speed_s = "1.5";
2137 else if (speed == 2)
2138 speed_s = "3";
2139 else if (speed == 3)
2140 speed_s = "6";
2141 else
2142 speed_s = "?";
2143
2144 dev_info(host->dev,
2145 "AHCI %02x%02x.%02x%02x "
2146 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2147 ,
2148
2149 (vers >> 24) & 0xff,
2150 (vers >> 16) & 0xff,
2151 (vers >> 8) & 0xff,
2152 vers & 0xff,
2153
2154 ((cap >> 8) & 0x1f) + 1,
2155 (cap & 0x1f) + 1,
2156 speed_s,
2157 impl,
2158 scc_s);
2159
2160 dev_info(host->dev,
2161 "flags: "
2162 "%s%s%s%s%s%s%s"
2163 "%s%s%s%s%s%s%s"
2164 "%s%s%s%s%s%s\n"
2165 ,
2166
2167 cap & HOST_CAP_64 ? "64bit " : "",
2168 cap & HOST_CAP_NCQ ? "ncq " : "",
2169 cap & HOST_CAP_SNTF ? "sntf " : "",
2170 cap & HOST_CAP_MPS ? "ilck " : "",
2171 cap & HOST_CAP_SSS ? "stag " : "",
2172 cap & HOST_CAP_ALPM ? "pm " : "",
2173 cap & HOST_CAP_LED ? "led " : "",
2174 cap & HOST_CAP_CLO ? "clo " : "",
2175 cap & HOST_CAP_ONLY ? "only " : "",
2176 cap & HOST_CAP_PMP ? "pmp " : "",
2177 cap & HOST_CAP_FBS ? "fbs " : "",
2178 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2179 cap & HOST_CAP_SSC ? "slum " : "",
2180 cap & HOST_CAP_PART ? "part " : "",
2181 cap & HOST_CAP_CCC ? "ccc " : "",
2182 cap & HOST_CAP_EMS ? "ems " : "",
2183 cap & HOST_CAP_SXS ? "sxs " : "",
2184 cap2 & HOST_CAP2_APST ? "apst " : "",
2185 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2186 cap2 & HOST_CAP2_BOH ? "boh " : ""
2187 );
2188 }
2189 EXPORT_SYMBOL_GPL(ahci_print_info);
2190
2191 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2192 struct ata_port_info *pi)
2193 {
2194 u8 messages;
2195 void __iomem *mmio = hpriv->mmio;
2196 u32 em_loc = readl(mmio + HOST_EM_LOC);
2197 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2198
2199 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2200 return;
2201
2202 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2203
2204 if (messages) {
2205 /* store em_loc */
2206 hpriv->em_loc = ((em_loc >> 16) * 4);
2207 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2208 hpriv->em_msg_type = messages;
2209 pi->flags |= ATA_FLAG_EM;
2210 if (!(em_ctl & EM_CTL_ALHD))
2211 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2212 }
2213 }
2214 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2215
2216 MODULE_AUTHOR("Jeff Garzik");
2217 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2218 MODULE_LICENSE("GPL");
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