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efivars: Use string functions in pstore_write
[linux-2.6/next.git] / drivers / ata / libahci.c
blob41223c7f0206f9a5483ebb8b94bcb66a7c8eb24c
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_hardreset(struct ata_link *link, unsigned int *class,
86 unsigned long deadline);
87 static void ahci_postreset(struct ata_link *link, unsigned int *class);
88 static void ahci_error_handler(struct ata_port *ap);
89 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
90 static void ahci_dev_config(struct ata_device *dev);
91 #ifdef CONFIG_PM
92 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
93 #endif
94 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
95 static ssize_t ahci_activity_store(struct ata_device *dev,
96 enum sw_activity val);
97 static void ahci_init_sw_activity(struct ata_link *link);
98
99 static ssize_t ahci_show_host_caps(struct device *dev,
100 struct device_attribute *attr, char *buf);
101 static ssize_t ahci_show_host_cap2(struct device *dev,
102 struct device_attribute *attr, char *buf);
103 static ssize_t ahci_show_host_version(struct device *dev,
104 struct device_attribute *attr, char *buf);
105 static ssize_t ahci_show_port_cmd(struct device *dev,
106 struct device_attribute *attr, char *buf);
107 static ssize_t ahci_read_em_buffer(struct device *dev,
108 struct device_attribute *attr, char *buf);
109 static ssize_t ahci_store_em_buffer(struct device *dev,
110 struct device_attribute *attr,
111 const char *buf, size_t size);
112 static ssize_t ahci_show_em_supported(struct device *dev,
113 struct device_attribute *attr, char *buf);
114
115 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
116 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
117 static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
118 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
119 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
120 ahci_read_em_buffer, ahci_store_em_buffer);
121 static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
122
123 struct device_attribute *ahci_shost_attrs[] = {
124 &dev_attr_link_power_management_policy,
125 &dev_attr_em_message_type,
126 &dev_attr_em_message,
127 &dev_attr_ahci_host_caps,
128 &dev_attr_ahci_host_cap2,
129 &dev_attr_ahci_host_version,
130 &dev_attr_ahci_port_cmd,
131 &dev_attr_em_buffer,
132 &dev_attr_em_message_supported,
133 NULL
134 };
135 EXPORT_SYMBOL_GPL(ahci_shost_attrs);
136
137 struct device_attribute *ahci_sdev_attrs[] = {
138 &dev_attr_sw_activity,
139 &dev_attr_unload_heads,
140 NULL
141 };
142 EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
143
144 struct ata_port_operations ahci_ops = {
145 .inherits = &sata_pmp_port_ops,
146
147 .qc_defer = ahci_pmp_qc_defer,
148 .qc_prep = ahci_qc_prep,
149 .qc_issue = ahci_qc_issue,
150 .qc_fill_rtf = ahci_qc_fill_rtf,
151
152 .freeze = ahci_freeze,
153 .thaw = ahci_thaw,
154 .softreset = ahci_softreset,
155 .hardreset = ahci_hardreset,
156 .postreset = ahci_postreset,
157 .pmp_softreset = ahci_softreset,
158 .error_handler = ahci_error_handler,
159 .post_internal_cmd = ahci_post_internal_cmd,
160 .dev_config = ahci_dev_config,
161
162 .scr_read = ahci_scr_read,
163 .scr_write = ahci_scr_write,
164 .pmp_attach = ahci_pmp_attach,
165 .pmp_detach = ahci_pmp_detach,
166
167 .set_lpm = ahci_set_lpm,
168 .em_show = ahci_led_show,
169 .em_store = ahci_led_store,
170 .sw_activity_show = ahci_activity_show,
171 .sw_activity_store = ahci_activity_store,
172 #ifdef CONFIG_PM
173 .port_suspend = ahci_port_suspend,
174 .port_resume = ahci_port_resume,
175 #endif
176 .port_start = ahci_port_start,
177 .port_stop = ahci_port_stop,
178 };
179 EXPORT_SYMBOL_GPL(ahci_ops);
180
181 int ahci_em_messages = 1;
182 EXPORT_SYMBOL_GPL(ahci_em_messages);
183 module_param(ahci_em_messages, int, 0444);
184 /* add other LED protocol types when they become supported */
185 MODULE_PARM_DESC(ahci_em_messages,
186 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
187
188 static void ahci_enable_ahci(void __iomem *mmio)
189 {
190 int i;
191 u32 tmp;
192
193 /* turn on AHCI_EN */
194 tmp = readl(mmio + HOST_CTL);
195 if (tmp & HOST_AHCI_EN)
196 return;
197
198 /* Some controllers need AHCI_EN to be written multiple times.
199 * Try a few times before giving up.
200 */
201 for (i = 0; i < 5; i++) {
202 tmp |= HOST_AHCI_EN;
203 writel(tmp, mmio + HOST_CTL);
204 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
205 if (tmp & HOST_AHCI_EN)
206 return;
207 msleep(10);
208 }
209
210 WARN_ON(1);
211 }
212
213 static ssize_t ahci_show_host_caps(struct device *dev,
214 struct device_attribute *attr, char *buf)
215 {
216 struct Scsi_Host *shost = class_to_shost(dev);
217 struct ata_port *ap = ata_shost_to_port(shost);
218 struct ahci_host_priv *hpriv = ap->host->private_data;
219
220 return sprintf(buf, "%x\n", hpriv->cap);
221 }
222
223 static ssize_t ahci_show_host_cap2(struct device *dev,
224 struct device_attribute *attr, char *buf)
225 {
226 struct Scsi_Host *shost = class_to_shost(dev);
227 struct ata_port *ap = ata_shost_to_port(shost);
228 struct ahci_host_priv *hpriv = ap->host->private_data;
229
230 return sprintf(buf, "%x\n", hpriv->cap2);
231 }
232
233 static ssize_t ahci_show_host_version(struct device *dev,
234 struct device_attribute *attr, char *buf)
235 {
236 struct Scsi_Host *shost = class_to_shost(dev);
237 struct ata_port *ap = ata_shost_to_port(shost);
238 struct ahci_host_priv *hpriv = ap->host->private_data;
239 void __iomem *mmio = hpriv->mmio;
240
241 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
242 }
243
244 static ssize_t ahci_show_port_cmd(struct device *dev,
245 struct device_attribute *attr, char *buf)
246 {
247 struct Scsi_Host *shost = class_to_shost(dev);
248 struct ata_port *ap = ata_shost_to_port(shost);
249 void __iomem *port_mmio = ahci_port_base(ap);
250
251 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
252 }
253
254 static ssize_t ahci_read_em_buffer(struct device *dev,
255 struct device_attribute *attr, char *buf)
256 {
257 struct Scsi_Host *shost = class_to_shost(dev);
258 struct ata_port *ap = ata_shost_to_port(shost);
259 struct ahci_host_priv *hpriv = ap->host->private_data;
260 void __iomem *mmio = hpriv->mmio;
261 void __iomem *em_mmio = mmio + hpriv->em_loc;
262 u32 em_ctl, msg;
263 unsigned long flags;
264 size_t count;
265 int i;
266
267 spin_lock_irqsave(ap->lock, flags);
268
269 em_ctl = readl(mmio + HOST_EM_CTL);
270 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
271 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
272 spin_unlock_irqrestore(ap->lock, flags);
273 return -EINVAL;
274 }
275
276 if (!(em_ctl & EM_CTL_MR)) {
277 spin_unlock_irqrestore(ap->lock, flags);
278 return -EAGAIN;
279 }
280
281 if (!(em_ctl & EM_CTL_SMB))
282 em_mmio += hpriv->em_buf_sz;
283
284 count = hpriv->em_buf_sz;
285
286 /* the count should not be larger than PAGE_SIZE */
287 if (count > PAGE_SIZE) {
288 if (printk_ratelimit())
289 ata_port_printk(ap, KERN_WARNING,
290 "EM read buffer size too large: "
291 "buffer size %u, page size %lu\n",
292 hpriv->em_buf_sz, PAGE_SIZE);
293 count = PAGE_SIZE;
294 }
295
296 for (i = 0; i < count; i += 4) {
297 msg = readl(em_mmio + i);
298 buf[i] = msg & 0xff;
299 buf[i + 1] = (msg >> 8) & 0xff;
300 buf[i + 2] = (msg >> 16) & 0xff;
301 buf[i + 3] = (msg >> 24) & 0xff;
302 }
303
304 spin_unlock_irqrestore(ap->lock, flags);
305
306 return i;
307 }
308
309 static ssize_t ahci_store_em_buffer(struct device *dev,
310 struct device_attribute *attr,
311 const char *buf, size_t size)
312 {
313 struct Scsi_Host *shost = class_to_shost(dev);
314 struct ata_port *ap = ata_shost_to_port(shost);
315 struct ahci_host_priv *hpriv = ap->host->private_data;
316 void __iomem *mmio = hpriv->mmio;
317 void __iomem *em_mmio = mmio + hpriv->em_loc;
318 const unsigned char *msg_buf = buf;
319 u32 em_ctl, msg;
320 unsigned long flags;
321 int i;
322
323 /* check size validity */
324 if (!(ap->flags & ATA_FLAG_EM) ||
325 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
326 size % 4 || size > hpriv->em_buf_sz)
327 return -EINVAL;
328
329 spin_lock_irqsave(ap->lock, flags);
330
331 em_ctl = readl(mmio + HOST_EM_CTL);
332 if (em_ctl & EM_CTL_TM) {
333 spin_unlock_irqrestore(ap->lock, flags);
334 return -EBUSY;
335 }
336
337 for (i = 0; i < size; i += 4) {
338 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
339 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
340 writel(msg, em_mmio + i);
341 }
342
343 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
344
345 spin_unlock_irqrestore(ap->lock, flags);
346
347 return size;
348 }
349
350 static ssize_t ahci_show_em_supported(struct device *dev,
351 struct device_attribute *attr, char *buf)
352 {
353 struct Scsi_Host *shost = class_to_shost(dev);
354 struct ata_port *ap = ata_shost_to_port(shost);
355 struct ahci_host_priv *hpriv = ap->host->private_data;
356 void __iomem *mmio = hpriv->mmio;
357 u32 em_ctl;
358
359 em_ctl = readl(mmio + HOST_EM_CTL);
360
361 return sprintf(buf, "%s%s%s%s\n",
362 em_ctl & EM_CTL_LED ? "led " : "",
363 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
364 em_ctl & EM_CTL_SES ? "ses-2 " : "",
365 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
366 }
367
368 /**
369 * ahci_save_initial_config - Save and fixup initial config values
370 * @dev: target AHCI device
371 * @hpriv: host private area to store config values
372 * @force_port_map: force port map to a specified value
373 * @mask_port_map: mask out particular bits from port map
374 *
375 * Some registers containing configuration info might be setup by
376 * BIOS and might be cleared on reset. This function saves the
377 * initial values of those registers into @hpriv such that they
378 * can be restored after controller reset.
379 *
380 * If inconsistent, config values are fixed up by this function.
381 *
382 * LOCKING:
383 * None.
384 */
385 void ahci_save_initial_config(struct device *dev,
386 struct ahci_host_priv *hpriv,
387 unsigned int force_port_map,
388 unsigned int mask_port_map)
389 {
390 void __iomem *mmio = hpriv->mmio;
391 u32 cap, cap2, vers, port_map;
392 int i;
393
394 /* make sure AHCI mode is enabled before accessing CAP */
395 ahci_enable_ahci(mmio);
396
397 /* Values prefixed with saved_ are written back to host after
398 * reset. Values without are used for driver operation.
399 */
400 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
401 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
402
403 /* CAP2 register is only defined for AHCI 1.2 and later */
404 vers = readl(mmio + HOST_VERSION);
405 if ((vers >> 16) > 1 ||
406 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
407 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
408 else
409 hpriv->saved_cap2 = cap2 = 0;
410
411 /* some chips have errata preventing 64bit use */
412 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
413 dev_printk(KERN_INFO, dev,
414 "controller can't do 64bit DMA, forcing 32bit\n");
415 cap &= ~HOST_CAP_64;
416 }
417
418 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
419 dev_printk(KERN_INFO, dev,
420 "controller can't do NCQ, turning off CAP_NCQ\n");
421 cap &= ~HOST_CAP_NCQ;
422 }
423
424 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
425 dev_printk(KERN_INFO, dev,
426 "controller can do NCQ, turning on CAP_NCQ\n");
427 cap |= HOST_CAP_NCQ;
428 }
429
430 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
431 dev_printk(KERN_INFO, dev,
432 "controller can't do PMP, turning off CAP_PMP\n");
433 cap &= ~HOST_CAP_PMP;
434 }
435
436 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
437 dev_printk(KERN_INFO, dev,
438 "controller can't do SNTF, turning off CAP_SNTF\n");
439 cap &= ~HOST_CAP_SNTF;
440 }
441
442 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
443 dev_printk(KERN_INFO, dev,
444 "controller can do FBS, turning on CAP_FBS\n");
445 cap |= HOST_CAP_FBS;
446 }
447
448 if (force_port_map && port_map != force_port_map) {
449 dev_printk(KERN_INFO, dev, "forcing port_map 0x%x -> 0x%x\n",
450 port_map, force_port_map);
451 port_map = force_port_map;
452 }
453
454 if (mask_port_map) {
455 dev_printk(KERN_WARNING, dev, "masking port_map 0x%x -> 0x%x\n",
456 port_map,
457 port_map & mask_port_map);
458 port_map &= mask_port_map;
459 }
460
461 /* cross check port_map and cap.n_ports */
462 if (port_map) {
463 int map_ports = 0;
464
465 for (i = 0; i < AHCI_MAX_PORTS; i++)
466 if (port_map & (1 << i))
467 map_ports++;
468
469 /* If PI has more ports than n_ports, whine, clear
470 * port_map and let it be generated from n_ports.
471 */
472 if (map_ports > ahci_nr_ports(cap)) {
473 dev_printk(KERN_WARNING, dev,
474 "implemented port map (0x%x) contains more "
475 "ports than nr_ports (%u), using nr_ports\n",
476 port_map, ahci_nr_ports(cap));
477 port_map = 0;
478 }
479 }
480
481 /* fabricate port_map from cap.nr_ports */
482 if (!port_map) {
483 port_map = (1 << ahci_nr_ports(cap)) - 1;
484 dev_printk(KERN_WARNING, dev,
485 "forcing PORTS_IMPL to 0x%x\n", port_map);
486
487 /* write the fixed up value to the PI register */
488 hpriv->saved_port_map = port_map;
489 }
490
491 /* record values to use during operation */
492 hpriv->cap = cap;
493 hpriv->cap2 = cap2;
494 hpriv->port_map = port_map;
495 }
496 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
497
498 /**
499 * ahci_restore_initial_config - Restore initial config
500 * @host: target ATA host
501 *
502 * Restore initial config stored by ahci_save_initial_config().
503 *
504 * LOCKING:
505 * None.
506 */
507 static void ahci_restore_initial_config(struct ata_host *host)
508 {
509 struct ahci_host_priv *hpriv = host->private_data;
510 void __iomem *mmio = hpriv->mmio;
511
512 writel(hpriv->saved_cap, mmio + HOST_CAP);
513 if (hpriv->saved_cap2)
514 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
515 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
516 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
517 }
518
519 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
520 {
521 static const int offset[] = {
522 [SCR_STATUS] = PORT_SCR_STAT,
523 [SCR_CONTROL] = PORT_SCR_CTL,
524 [SCR_ERROR] = PORT_SCR_ERR,
525 [SCR_ACTIVE] = PORT_SCR_ACT,
526 [SCR_NOTIFICATION] = PORT_SCR_NTF,
527 };
528 struct ahci_host_priv *hpriv = ap->host->private_data;
529
530 if (sc_reg < ARRAY_SIZE(offset) &&
531 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
532 return offset[sc_reg];
533 return 0;
534 }
535
536 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
537 {
538 void __iomem *port_mmio = ahci_port_base(link->ap);
539 int offset = ahci_scr_offset(link->ap, sc_reg);
540
541 if (offset) {
542 *val = readl(port_mmio + offset);
543 return 0;
544 }
545 return -EINVAL;
546 }
547
548 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
549 {
550 void __iomem *port_mmio = ahci_port_base(link->ap);
551 int offset = ahci_scr_offset(link->ap, sc_reg);
552
553 if (offset) {
554 writel(val, port_mmio + offset);
555 return 0;
556 }
557 return -EINVAL;
558 }
559
560 void ahci_start_engine(struct ata_port *ap)
561 {
562 void __iomem *port_mmio = ahci_port_base(ap);
563 u32 tmp;
564
565 /* start DMA */
566 tmp = readl(port_mmio + PORT_CMD);
567 tmp |= PORT_CMD_START;
568 writel(tmp, port_mmio + PORT_CMD);
569 readl(port_mmio + PORT_CMD); /* flush */
570 }
571 EXPORT_SYMBOL_GPL(ahci_start_engine);
572
573 int ahci_stop_engine(struct ata_port *ap)
574 {
575 void __iomem *port_mmio = ahci_port_base(ap);
576 u32 tmp;
577
578 tmp = readl(port_mmio + PORT_CMD);
579
580 /* check if the HBA is idle */
581 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
582 return 0;
583
584 /* setting HBA to idle */
585 tmp &= ~PORT_CMD_START;
586 writel(tmp, port_mmio + PORT_CMD);
587
588 /* wait for engine to stop. This could be as long as 500 msec */
589 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
590 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
591 if (tmp & PORT_CMD_LIST_ON)
592 return -EIO;
593
594 return 0;
595 }
596 EXPORT_SYMBOL_GPL(ahci_stop_engine);
597
598 static void ahci_start_fis_rx(struct ata_port *ap)
599 {
600 void __iomem *port_mmio = ahci_port_base(ap);
601 struct ahci_host_priv *hpriv = ap->host->private_data;
602 struct ahci_port_priv *pp = ap->private_data;
603 u32 tmp;
604
605 /* set FIS registers */
606 if (hpriv->cap & HOST_CAP_64)
607 writel((pp->cmd_slot_dma >> 16) >> 16,
608 port_mmio + PORT_LST_ADDR_HI);
609 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
610
611 if (hpriv->cap & HOST_CAP_64)
612 writel((pp->rx_fis_dma >> 16) >> 16,
613 port_mmio + PORT_FIS_ADDR_HI);
614 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
615
616 /* enable FIS reception */
617 tmp = readl(port_mmio + PORT_CMD);
618 tmp |= PORT_CMD_FIS_RX;
619 writel(tmp, port_mmio + PORT_CMD);
620
621 /* flush */
622 readl(port_mmio + PORT_CMD);
623 }
624
625 static int ahci_stop_fis_rx(struct ata_port *ap)
626 {
627 void __iomem *port_mmio = ahci_port_base(ap);
628 u32 tmp;
629
630 /* disable FIS reception */
631 tmp = readl(port_mmio + PORT_CMD);
632 tmp &= ~PORT_CMD_FIS_RX;
633 writel(tmp, port_mmio + PORT_CMD);
634
635 /* wait for completion, spec says 500ms, give it 1000 */
636 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
637 PORT_CMD_FIS_ON, 10, 1000);
638 if (tmp & PORT_CMD_FIS_ON)
639 return -EBUSY;
640
641 return 0;
642 }
643
644 static void ahci_power_up(struct ata_port *ap)
645 {
646 struct ahci_host_priv *hpriv = ap->host->private_data;
647 void __iomem *port_mmio = ahci_port_base(ap);
648 u32 cmd;
649
650 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
651
652 /* spin up device */
653 if (hpriv->cap & HOST_CAP_SSS) {
654 cmd |= PORT_CMD_SPIN_UP;
655 writel(cmd, port_mmio + PORT_CMD);
656 }
657
658 /* wake up link */
659 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
660 }
661
662 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
663 unsigned int hints)
664 {
665 struct ata_port *ap = link->ap;
666 struct ahci_host_priv *hpriv = ap->host->private_data;
667 struct ahci_port_priv *pp = ap->private_data;
668 void __iomem *port_mmio = ahci_port_base(ap);
669
670 if (policy != ATA_LPM_MAX_POWER) {
671 /*
672 * Disable interrupts on Phy Ready. This keeps us from
673 * getting woken up due to spurious phy ready
674 * interrupts.
675 */
676 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
677 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
678
679 sata_link_scr_lpm(link, policy, false);
680 }
681
682 if (hpriv->cap & HOST_CAP_ALPM) {
683 u32 cmd = readl(port_mmio + PORT_CMD);
684
685 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
686 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
687 cmd |= PORT_CMD_ICC_ACTIVE;
688
689 writel(cmd, port_mmio + PORT_CMD);
690 readl(port_mmio + PORT_CMD);
691
692 /* wait 10ms to be sure we've come out of LPM state */
693 ata_msleep(ap, 10);
694 } else {
695 cmd |= PORT_CMD_ALPE;
696 if (policy == ATA_LPM_MIN_POWER)
697 cmd |= PORT_CMD_ASP;
698
699 /* write out new cmd value */
700 writel(cmd, port_mmio + PORT_CMD);
701 }
702 }
703
704 if (policy == ATA_LPM_MAX_POWER) {
705 sata_link_scr_lpm(link, policy, false);
706
707 /* turn PHYRDY IRQ back on */
708 pp->intr_mask |= PORT_IRQ_PHYRDY;
709 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
710 }
711
712 return 0;
713 }
714
715 #ifdef CONFIG_PM
716 static void ahci_power_down(struct ata_port *ap)
717 {
718 struct ahci_host_priv *hpriv = ap->host->private_data;
719 void __iomem *port_mmio = ahci_port_base(ap);
720 u32 cmd, scontrol;
721
722 if (!(hpriv->cap & HOST_CAP_SSS))
723 return;
724
725 /* put device into listen mode, first set PxSCTL.DET to 0 */
726 scontrol = readl(port_mmio + PORT_SCR_CTL);
727 scontrol &= ~0xf;
728 writel(scontrol, port_mmio + PORT_SCR_CTL);
729
730 /* then set PxCMD.SUD to 0 */
731 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
732 cmd &= ~PORT_CMD_SPIN_UP;
733 writel(cmd, port_mmio + PORT_CMD);
734 }
735 #endif
736
737 static void ahci_start_port(struct ata_port *ap)
738 {
739 struct ahci_port_priv *pp = ap->private_data;
740 struct ata_link *link;
741 struct ahci_em_priv *emp;
742 ssize_t rc;
743 int i;
744
745 /* enable FIS reception */
746 ahci_start_fis_rx(ap);
747
748 /* enable DMA */
749 ahci_start_engine(ap);
750
751 /* turn on LEDs */
752 if (ap->flags & ATA_FLAG_EM) {
753 ata_for_each_link(link, ap, EDGE) {
754 emp = &pp->em_priv[link->pmp];
755
756 /* EM Transmit bit maybe busy during init */
757 for (i = 0; i < EM_MAX_RETRY; i++) {
758 rc = ahci_transmit_led_message(ap,
759 emp->led_state,
760 4);
761 if (rc == -EBUSY)
762 ata_msleep(ap, 1);
763 else
764 break;
765 }
766 }
767 }
768
769 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
770 ata_for_each_link(link, ap, EDGE)
771 ahci_init_sw_activity(link);
772
773 }
774
775 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
776 {
777 int rc;
778
779 /* disable DMA */
780 rc = ahci_stop_engine(ap);
781 if (rc) {
782 *emsg = "failed to stop engine";
783 return rc;
784 }
785
786 /* disable FIS reception */
787 rc = ahci_stop_fis_rx(ap);
788 if (rc) {
789 *emsg = "failed stop FIS RX";
790 return rc;
791 }
792
793 return 0;
794 }
795
796 int ahci_reset_controller(struct ata_host *host)
797 {
798 struct ahci_host_priv *hpriv = host->private_data;
799 void __iomem *mmio = hpriv->mmio;
800 u32 tmp;
801
802 /* we must be in AHCI mode, before using anything
803 * AHCI-specific, such as HOST_RESET.
804 */
805 ahci_enable_ahci(mmio);
806
807 /* global controller reset */
808 if (!ahci_skip_host_reset) {
809 tmp = readl(mmio + HOST_CTL);
810 if ((tmp & HOST_RESET) == 0) {
811 writel(tmp | HOST_RESET, mmio + HOST_CTL);
812 readl(mmio + HOST_CTL); /* flush */
813 }
814
815 /*
816 * to perform host reset, OS should set HOST_RESET
817 * and poll until this bit is read to be "0".
818 * reset must complete within 1 second, or
819 * the hardware should be considered fried.
820 */
821 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
822 HOST_RESET, 10, 1000);
823
824 if (tmp & HOST_RESET) {
825 dev_printk(KERN_ERR, host->dev,
826 "controller reset failed (0x%x)\n", tmp);
827 return -EIO;
828 }
829
830 /* turn on AHCI mode */
831 ahci_enable_ahci(mmio);
832
833 /* Some registers might be cleared on reset. Restore
834 * initial values.
835 */
836 ahci_restore_initial_config(host);
837 } else
838 dev_printk(KERN_INFO, host->dev,
839 "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_printk(dev, KERN_INFO,
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_printk(link, KERN_WARNING,
1261 "failed to reset engine (errno=%d)\n", rc);
1262
1263 ata_tf_init(link->device, &tf);
1264
1265 /* issue the first D2H Register FIS */
1266 msecs = 0;
1267 now = jiffies;
1268 if (time_after(deadline, now))
1269 msecs = jiffies_to_msecs(deadline - now);
1270
1271 tf.ctl |= ATA_SRST;
1272 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1273 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1274 rc = -EIO;
1275 reason = "1st FIS failed";
1276 goto fail;
1277 }
1278
1279 /* spec says at least 5us, but be generous and sleep for 1ms */
1280 ata_msleep(ap, 1);
1281
1282 /* issue the second D2H Register FIS */
1283 tf.ctl &= ~ATA_SRST;
1284 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1285
1286 /* wait for link to become ready */
1287 rc = ata_wait_after_reset(link, deadline, check_ready);
1288 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1289 /*
1290 * Workaround for cases where link online status can't
1291 * be trusted. Treat device readiness timeout as link
1292 * offline.
1293 */
1294 ata_link_printk(link, KERN_INFO,
1295 "device not ready, treating as offline\n");
1296 *class = ATA_DEV_NONE;
1297 } else if (rc) {
1298 /* link occupied, -ENODEV too is an error */
1299 reason = "device not ready";
1300 goto fail;
1301 } else
1302 *class = ahci_dev_classify(ap);
1303
1304 DPRINTK("EXIT, class=%u\n", *class);
1305 return 0;
1306
1307 fail:
1308 ata_link_printk(link, KERN_ERR, "softreset failed (%s)\n", reason);
1309 return rc;
1310 }
1311
1312 int ahci_check_ready(struct ata_link *link)
1313 {
1314 void __iomem *port_mmio = ahci_port_base(link->ap);
1315 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1316
1317 return ata_check_ready(status);
1318 }
1319 EXPORT_SYMBOL_GPL(ahci_check_ready);
1320
1321 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1322 unsigned long deadline)
1323 {
1324 int pmp = sata_srst_pmp(link);
1325
1326 DPRINTK("ENTER\n");
1327
1328 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1329 }
1330 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1331
1332 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1333 unsigned long deadline)
1334 {
1335 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1336 struct ata_port *ap = link->ap;
1337 struct ahci_port_priv *pp = ap->private_data;
1338 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1339 struct ata_taskfile tf;
1340 bool online;
1341 int rc;
1342
1343 DPRINTK("ENTER\n");
1344
1345 ahci_stop_engine(ap);
1346
1347 /* clear D2H reception area to properly wait for D2H FIS */
1348 ata_tf_init(link->device, &tf);
1349 tf.command = 0x80;
1350 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1351
1352 rc = sata_link_hardreset(link, timing, deadline, &online,
1353 ahci_check_ready);
1354
1355 ahci_start_engine(ap);
1356
1357 if (online)
1358 *class = ahci_dev_classify(ap);
1359
1360 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1361 return rc;
1362 }
1363
1364 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1365 {
1366 struct ata_port *ap = link->ap;
1367 void __iomem *port_mmio = ahci_port_base(ap);
1368 u32 new_tmp, tmp;
1369
1370 ata_std_postreset(link, class);
1371
1372 /* Make sure port's ATAPI bit is set appropriately */
1373 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1374 if (*class == ATA_DEV_ATAPI)
1375 new_tmp |= PORT_CMD_ATAPI;
1376 else
1377 new_tmp &= ~PORT_CMD_ATAPI;
1378 if (new_tmp != tmp) {
1379 writel(new_tmp, port_mmio + PORT_CMD);
1380 readl(port_mmio + PORT_CMD); /* flush */
1381 }
1382 }
1383
1384 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1385 {
1386 struct scatterlist *sg;
1387 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1388 unsigned int si;
1389
1390 VPRINTK("ENTER\n");
1391
1392 /*
1393 * Next, the S/G list.
1394 */
1395 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1396 dma_addr_t addr = sg_dma_address(sg);
1397 u32 sg_len = sg_dma_len(sg);
1398
1399 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1400 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1401 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1402 }
1403
1404 return si;
1405 }
1406
1407 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1408 {
1409 struct ata_port *ap = qc->ap;
1410 struct ahci_port_priv *pp = ap->private_data;
1411
1412 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1413 return ata_std_qc_defer(qc);
1414 else
1415 return sata_pmp_qc_defer_cmd_switch(qc);
1416 }
1417
1418 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1419 {
1420 struct ata_port *ap = qc->ap;
1421 struct ahci_port_priv *pp = ap->private_data;
1422 int is_atapi = ata_is_atapi(qc->tf.protocol);
1423 void *cmd_tbl;
1424 u32 opts;
1425 const u32 cmd_fis_len = 5; /* five dwords */
1426 unsigned int n_elem;
1427
1428 /*
1429 * Fill in command table information. First, the header,
1430 * a SATA Register - Host to Device command FIS.
1431 */
1432 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1433
1434 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1435 if (is_atapi) {
1436 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1437 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1438 }
1439
1440 n_elem = 0;
1441 if (qc->flags & ATA_QCFLAG_DMAMAP)
1442 n_elem = ahci_fill_sg(qc, cmd_tbl);
1443
1444 /*
1445 * Fill in command slot information.
1446 */
1447 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1448 if (qc->tf.flags & ATA_TFLAG_WRITE)
1449 opts |= AHCI_CMD_WRITE;
1450 if (is_atapi)
1451 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1452
1453 ahci_fill_cmd_slot(pp, qc->tag, opts);
1454 }
1455
1456 static void ahci_fbs_dec_intr(struct ata_port *ap)
1457 {
1458 struct ahci_port_priv *pp = ap->private_data;
1459 void __iomem *port_mmio = ahci_port_base(ap);
1460 u32 fbs = readl(port_mmio + PORT_FBS);
1461 int retries = 3;
1462
1463 DPRINTK("ENTER\n");
1464 BUG_ON(!pp->fbs_enabled);
1465
1466 /* time to wait for DEC is not specified by AHCI spec,
1467 * add a retry loop for safety.
1468 */
1469 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1470 fbs = readl(port_mmio + PORT_FBS);
1471 while ((fbs & PORT_FBS_DEC) && retries--) {
1472 udelay(1);
1473 fbs = readl(port_mmio + PORT_FBS);
1474 }
1475
1476 if (fbs & PORT_FBS_DEC)
1477 dev_printk(KERN_ERR, ap->host->dev,
1478 "failed to clear device error\n");
1479 }
1480
1481 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1482 {
1483 struct ahci_host_priv *hpriv = ap->host->private_data;
1484 struct ahci_port_priv *pp = ap->private_data;
1485 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1486 struct ata_link *link = NULL;
1487 struct ata_queued_cmd *active_qc;
1488 struct ata_eh_info *active_ehi;
1489 bool fbs_need_dec = false;
1490 u32 serror;
1491
1492 /* determine active link with error */
1493 if (pp->fbs_enabled) {
1494 void __iomem *port_mmio = ahci_port_base(ap);
1495 u32 fbs = readl(port_mmio + PORT_FBS);
1496 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1497
1498 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1499 ata_link_online(&ap->pmp_link[pmp])) {
1500 link = &ap->pmp_link[pmp];
1501 fbs_need_dec = true;
1502 }
1503
1504 } else
1505 ata_for_each_link(link, ap, EDGE)
1506 if (ata_link_active(link))
1507 break;
1508
1509 if (!link)
1510 link = &ap->link;
1511
1512 active_qc = ata_qc_from_tag(ap, link->active_tag);
1513 active_ehi = &link->eh_info;
1514
1515 /* record irq stat */
1516 ata_ehi_clear_desc(host_ehi);
1517 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1518
1519 /* AHCI needs SError cleared; otherwise, it might lock up */
1520 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1521 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1522 host_ehi->serror |= serror;
1523
1524 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1525 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1526 irq_stat &= ~PORT_IRQ_IF_ERR;
1527
1528 if (irq_stat & PORT_IRQ_TF_ERR) {
1529 /* If qc is active, charge it; otherwise, the active
1530 * link. There's no active qc on NCQ errors. It will
1531 * be determined by EH by reading log page 10h.
1532 */
1533 if (active_qc)
1534 active_qc->err_mask |= AC_ERR_DEV;
1535 else
1536 active_ehi->err_mask |= AC_ERR_DEV;
1537
1538 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1539 host_ehi->serror &= ~SERR_INTERNAL;
1540 }
1541
1542 if (irq_stat & PORT_IRQ_UNK_FIS) {
1543 u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1544
1545 active_ehi->err_mask |= AC_ERR_HSM;
1546 active_ehi->action |= ATA_EH_RESET;
1547 ata_ehi_push_desc(active_ehi,
1548 "unknown FIS %08x %08x %08x %08x" ,
1549 unk[0], unk[1], unk[2], unk[3]);
1550 }
1551
1552 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1553 active_ehi->err_mask |= AC_ERR_HSM;
1554 active_ehi->action |= ATA_EH_RESET;
1555 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1556 }
1557
1558 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1559 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1560 host_ehi->action |= ATA_EH_RESET;
1561 ata_ehi_push_desc(host_ehi, "host bus error");
1562 }
1563
1564 if (irq_stat & PORT_IRQ_IF_ERR) {
1565 if (fbs_need_dec)
1566 active_ehi->err_mask |= AC_ERR_DEV;
1567 else {
1568 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1569 host_ehi->action |= ATA_EH_RESET;
1570 }
1571
1572 ata_ehi_push_desc(host_ehi, "interface fatal error");
1573 }
1574
1575 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1576 ata_ehi_hotplugged(host_ehi);
1577 ata_ehi_push_desc(host_ehi, "%s",
1578 irq_stat & PORT_IRQ_CONNECT ?
1579 "connection status changed" : "PHY RDY changed");
1580 }
1581
1582 /* okay, let's hand over to EH */
1583
1584 if (irq_stat & PORT_IRQ_FREEZE)
1585 ata_port_freeze(ap);
1586 else if (fbs_need_dec) {
1587 ata_link_abort(link);
1588 ahci_fbs_dec_intr(ap);
1589 } else
1590 ata_port_abort(ap);
1591 }
1592
1593 static void ahci_port_intr(struct ata_port *ap)
1594 {
1595 void __iomem *port_mmio = ahci_port_base(ap);
1596 struct ata_eh_info *ehi = &ap->link.eh_info;
1597 struct ahci_port_priv *pp = ap->private_data;
1598 struct ahci_host_priv *hpriv = ap->host->private_data;
1599 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1600 u32 status, qc_active = 0;
1601 int rc;
1602
1603 status = readl(port_mmio + PORT_IRQ_STAT);
1604 writel(status, port_mmio + PORT_IRQ_STAT);
1605
1606 /* ignore BAD_PMP while resetting */
1607 if (unlikely(resetting))
1608 status &= ~PORT_IRQ_BAD_PMP;
1609
1610 /* if LPM is enabled, PHYRDY doesn't mean anything */
1611 if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
1612 status &= ~PORT_IRQ_PHYRDY;
1613 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1614 }
1615
1616 if (unlikely(status & PORT_IRQ_ERROR)) {
1617 ahci_error_intr(ap, status);
1618 return;
1619 }
1620
1621 if (status & PORT_IRQ_SDB_FIS) {
1622 /* If SNotification is available, leave notification
1623 * handling to sata_async_notification(). If not,
1624 * emulate it by snooping SDB FIS RX area.
1625 *
1626 * Snooping FIS RX area is probably cheaper than
1627 * poking SNotification but some constrollers which
1628 * implement SNotification, ICH9 for example, don't
1629 * store AN SDB FIS into receive area.
1630 */
1631 if (hpriv->cap & HOST_CAP_SNTF)
1632 sata_async_notification(ap);
1633 else {
1634 /* If the 'N' bit in word 0 of the FIS is set,
1635 * we just received asynchronous notification.
1636 * Tell libata about it.
1637 *
1638 * Lack of SNotification should not appear in
1639 * ahci 1.2, so the workaround is unnecessary
1640 * when FBS is enabled.
1641 */
1642 if (pp->fbs_enabled)
1643 WARN_ON_ONCE(1);
1644 else {
1645 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1646 u32 f0 = le32_to_cpu(f[0]);
1647 if (f0 & (1 << 15))
1648 sata_async_notification(ap);
1649 }
1650 }
1651 }
1652
1653 /* pp->active_link is not reliable once FBS is enabled, both
1654 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1655 * NCQ and non-NCQ commands may be in flight at the same time.
1656 */
1657 if (pp->fbs_enabled) {
1658 if (ap->qc_active) {
1659 qc_active = readl(port_mmio + PORT_SCR_ACT);
1660 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1661 }
1662 } else {
1663 /* pp->active_link is valid iff any command is in flight */
1664 if (ap->qc_active && pp->active_link->sactive)
1665 qc_active = readl(port_mmio + PORT_SCR_ACT);
1666 else
1667 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1668 }
1669
1670
1671 rc = ata_qc_complete_multiple(ap, qc_active);
1672
1673 /* while resetting, invalid completions are expected */
1674 if (unlikely(rc < 0 && !resetting)) {
1675 ehi->err_mask |= AC_ERR_HSM;
1676 ehi->action |= ATA_EH_RESET;
1677 ata_port_freeze(ap);
1678 }
1679 }
1680
1681 irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1682 {
1683 struct ata_host *host = dev_instance;
1684 struct ahci_host_priv *hpriv;
1685 unsigned int i, handled = 0;
1686 void __iomem *mmio;
1687 u32 irq_stat, irq_masked;
1688
1689 VPRINTK("ENTER\n");
1690
1691 hpriv = host->private_data;
1692 mmio = hpriv->mmio;
1693
1694 /* sigh. 0xffffffff is a valid return from h/w */
1695 irq_stat = readl(mmio + HOST_IRQ_STAT);
1696 if (!irq_stat)
1697 return IRQ_NONE;
1698
1699 irq_masked = irq_stat & hpriv->port_map;
1700
1701 spin_lock(&host->lock);
1702
1703 for (i = 0; i < host->n_ports; i++) {
1704 struct ata_port *ap;
1705
1706 if (!(irq_masked & (1 << i)))
1707 continue;
1708
1709 ap = host->ports[i];
1710 if (ap) {
1711 ahci_port_intr(ap);
1712 VPRINTK("port %u\n", i);
1713 } else {
1714 VPRINTK("port %u (no irq)\n", i);
1715 if (ata_ratelimit())
1716 dev_printk(KERN_WARNING, host->dev,
1717 "interrupt on disabled port %u\n", i);
1718 }
1719
1720 handled = 1;
1721 }
1722
1723 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1724 * it should be cleared after all the port events are cleared;
1725 * otherwise, it will raise a spurious interrupt after each
1726 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1727 * information.
1728 *
1729 * Also, use the unmasked value to clear interrupt as spurious
1730 * pending event on a dummy port might cause screaming IRQ.
1731 */
1732 writel(irq_stat, mmio + HOST_IRQ_STAT);
1733
1734 spin_unlock(&host->lock);
1735
1736 VPRINTK("EXIT\n");
1737
1738 return IRQ_RETVAL(handled);
1739 }
1740 EXPORT_SYMBOL_GPL(ahci_interrupt);
1741
1742 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1743 {
1744 struct ata_port *ap = qc->ap;
1745 void __iomem *port_mmio = ahci_port_base(ap);
1746 struct ahci_port_priv *pp = ap->private_data;
1747
1748 /* Keep track of the currently active link. It will be used
1749 * in completion path to determine whether NCQ phase is in
1750 * progress.
1751 */
1752 pp->active_link = qc->dev->link;
1753
1754 if (qc->tf.protocol == ATA_PROT_NCQ)
1755 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1756
1757 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1758 u32 fbs = readl(port_mmio + PORT_FBS);
1759 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1760 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1761 writel(fbs, port_mmio + PORT_FBS);
1762 pp->fbs_last_dev = qc->dev->link->pmp;
1763 }
1764
1765 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1766
1767 ahci_sw_activity(qc->dev->link);
1768
1769 return 0;
1770 }
1771
1772 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1773 {
1774 struct ahci_port_priv *pp = qc->ap->private_data;
1775 u8 *rx_fis = pp->rx_fis;
1776
1777 if (pp->fbs_enabled)
1778 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1779
1780 /*
1781 * After a successful execution of an ATA PIO data-in command,
1782 * the device doesn't send D2H Reg FIS to update the TF and
1783 * the host should take TF and E_Status from the preceding PIO
1784 * Setup FIS.
1785 */
1786 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1787 !(qc->flags & ATA_QCFLAG_FAILED)) {
1788 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1789 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1790 } else
1791 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1792
1793 return true;
1794 }
1795
1796 static void ahci_freeze(struct ata_port *ap)
1797 {
1798 void __iomem *port_mmio = ahci_port_base(ap);
1799
1800 /* turn IRQ off */
1801 writel(0, port_mmio + PORT_IRQ_MASK);
1802 }
1803
1804 static void ahci_thaw(struct ata_port *ap)
1805 {
1806 struct ahci_host_priv *hpriv = ap->host->private_data;
1807 void __iomem *mmio = hpriv->mmio;
1808 void __iomem *port_mmio = ahci_port_base(ap);
1809 u32 tmp;
1810 struct ahci_port_priv *pp = ap->private_data;
1811
1812 /* clear IRQ */
1813 tmp = readl(port_mmio + PORT_IRQ_STAT);
1814 writel(tmp, port_mmio + PORT_IRQ_STAT);
1815 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1816
1817 /* turn IRQ back on */
1818 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1819 }
1820
1821 static void ahci_error_handler(struct ata_port *ap)
1822 {
1823 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1824 /* restart engine */
1825 ahci_stop_engine(ap);
1826 ahci_start_engine(ap);
1827 }
1828
1829 sata_pmp_error_handler(ap);
1830
1831 if (!ata_dev_enabled(ap->link.device))
1832 ahci_stop_engine(ap);
1833 }
1834
1835 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1836 {
1837 struct ata_port *ap = qc->ap;
1838
1839 /* make DMA engine forget about the failed command */
1840 if (qc->flags & ATA_QCFLAG_FAILED)
1841 ahci_kick_engine(ap);
1842 }
1843
1844 static void ahci_enable_fbs(struct ata_port *ap)
1845 {
1846 struct ahci_port_priv *pp = ap->private_data;
1847 void __iomem *port_mmio = ahci_port_base(ap);
1848 u32 fbs;
1849 int rc;
1850
1851 if (!pp->fbs_supported)
1852 return;
1853
1854 fbs = readl(port_mmio + PORT_FBS);
1855 if (fbs & PORT_FBS_EN) {
1856 pp->fbs_enabled = true;
1857 pp->fbs_last_dev = -1; /* initialization */
1858 return;
1859 }
1860
1861 rc = ahci_stop_engine(ap);
1862 if (rc)
1863 return;
1864
1865 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
1866 fbs = readl(port_mmio + PORT_FBS);
1867 if (fbs & PORT_FBS_EN) {
1868 dev_printk(KERN_INFO, ap->host->dev, "FBS is enabled.\n");
1869 pp->fbs_enabled = true;
1870 pp->fbs_last_dev = -1; /* initialization */
1871 } else
1872 dev_printk(KERN_ERR, ap->host->dev, "Failed to enable FBS\n");
1873
1874 ahci_start_engine(ap);
1875 }
1876
1877 static void ahci_disable_fbs(struct ata_port *ap)
1878 {
1879 struct ahci_port_priv *pp = ap->private_data;
1880 void __iomem *port_mmio = ahci_port_base(ap);
1881 u32 fbs;
1882 int rc;
1883
1884 if (!pp->fbs_supported)
1885 return;
1886
1887 fbs = readl(port_mmio + PORT_FBS);
1888 if ((fbs & PORT_FBS_EN) == 0) {
1889 pp->fbs_enabled = false;
1890 return;
1891 }
1892
1893 rc = ahci_stop_engine(ap);
1894 if (rc)
1895 return;
1896
1897 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
1898 fbs = readl(port_mmio + PORT_FBS);
1899 if (fbs & PORT_FBS_EN)
1900 dev_printk(KERN_ERR, ap->host->dev, "Failed to disable FBS\n");
1901 else {
1902 dev_printk(KERN_INFO, ap->host->dev, "FBS is disabled.\n");
1903 pp->fbs_enabled = false;
1904 }
1905
1906 ahci_start_engine(ap);
1907 }
1908
1909 static void ahci_pmp_attach(struct ata_port *ap)
1910 {
1911 void __iomem *port_mmio = ahci_port_base(ap);
1912 struct ahci_port_priv *pp = ap->private_data;
1913 u32 cmd;
1914
1915 cmd = readl(port_mmio + PORT_CMD);
1916 cmd |= PORT_CMD_PMP;
1917 writel(cmd, port_mmio + PORT_CMD);
1918
1919 ahci_enable_fbs(ap);
1920
1921 pp->intr_mask |= PORT_IRQ_BAD_PMP;
1922
1923 /*
1924 * We must not change the port interrupt mask register if the
1925 * port is marked frozen, the value in pp->intr_mask will be
1926 * restored later when the port is thawed.
1927 *
1928 * Note that during initialization, the port is marked as
1929 * frozen since the irq handler is not yet registered.
1930 */
1931 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1932 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1933 }
1934
1935 static void ahci_pmp_detach(struct ata_port *ap)
1936 {
1937 void __iomem *port_mmio = ahci_port_base(ap);
1938 struct ahci_port_priv *pp = ap->private_data;
1939 u32 cmd;
1940
1941 ahci_disable_fbs(ap);
1942
1943 cmd = readl(port_mmio + PORT_CMD);
1944 cmd &= ~PORT_CMD_PMP;
1945 writel(cmd, port_mmio + PORT_CMD);
1946
1947 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
1948
1949 /* see comment above in ahci_pmp_attach() */
1950 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1951 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1952 }
1953
1954 int ahci_port_resume(struct ata_port *ap)
1955 {
1956 ahci_power_up(ap);
1957 ahci_start_port(ap);
1958
1959 if (sata_pmp_attached(ap))
1960 ahci_pmp_attach(ap);
1961 else
1962 ahci_pmp_detach(ap);
1963
1964 return 0;
1965 }
1966 EXPORT_SYMBOL_GPL(ahci_port_resume);
1967
1968 #ifdef CONFIG_PM
1969 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
1970 {
1971 const char *emsg = NULL;
1972 int rc;
1973
1974 rc = ahci_deinit_port(ap, &emsg);
1975 if (rc == 0)
1976 ahci_power_down(ap);
1977 else {
1978 ata_port_printk(ap, KERN_ERR, "%s (%d)\n", emsg, rc);
1979 ahci_start_port(ap);
1980 }
1981
1982 return rc;
1983 }
1984 #endif
1985
1986 static int ahci_port_start(struct ata_port *ap)
1987 {
1988 struct ahci_host_priv *hpriv = ap->host->private_data;
1989 struct device *dev = ap->host->dev;
1990 struct ahci_port_priv *pp;
1991 void *mem;
1992 dma_addr_t mem_dma;
1993 size_t dma_sz, rx_fis_sz;
1994
1995 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
1996 if (!pp)
1997 return -ENOMEM;
1998
1999 /* check FBS capability */
2000 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2001 void __iomem *port_mmio = ahci_port_base(ap);
2002 u32 cmd = readl(port_mmio + PORT_CMD);
2003 if (cmd & PORT_CMD_FBSCP)
2004 pp->fbs_supported = true;
2005 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2006 dev_printk(KERN_INFO, dev,
2007 "port %d can do FBS, forcing FBSCP\n",
2008 ap->port_no);
2009 pp->fbs_supported = true;
2010 } else
2011 dev_printk(KERN_WARNING, dev,
2012 "port %d is not capable of FBS\n",
2013 ap->port_no);
2014 }
2015
2016 if (pp->fbs_supported) {
2017 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2018 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2019 } else {
2020 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2021 rx_fis_sz = AHCI_RX_FIS_SZ;
2022 }
2023
2024 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2025 if (!mem)
2026 return -ENOMEM;
2027 memset(mem, 0, dma_sz);
2028
2029 /*
2030 * First item in chunk of DMA memory: 32-slot command table,
2031 * 32 bytes each in size
2032 */
2033 pp->cmd_slot = mem;
2034 pp->cmd_slot_dma = mem_dma;
2035
2036 mem += AHCI_CMD_SLOT_SZ;
2037 mem_dma += AHCI_CMD_SLOT_SZ;
2038
2039 /*
2040 * Second item: Received-FIS area
2041 */
2042 pp->rx_fis = mem;
2043 pp->rx_fis_dma = mem_dma;
2044
2045 mem += rx_fis_sz;
2046 mem_dma += rx_fis_sz;
2047
2048 /*
2049 * Third item: data area for storing a single command
2050 * and its scatter-gather table
2051 */
2052 pp->cmd_tbl = mem;
2053 pp->cmd_tbl_dma = mem_dma;
2054
2055 /*
2056 * Save off initial list of interrupts to be enabled.
2057 * This could be changed later
2058 */
2059 pp->intr_mask = DEF_PORT_IRQ;
2060
2061 ap->private_data = pp;
2062
2063 /* engage engines, captain */
2064 return ahci_port_resume(ap);
2065 }
2066
2067 static void ahci_port_stop(struct ata_port *ap)
2068 {
2069 const char *emsg = NULL;
2070 int rc;
2071
2072 /* de-initialize port */
2073 rc = ahci_deinit_port(ap, &emsg);
2074 if (rc)
2075 ata_port_printk(ap, KERN_WARNING, "%s (%d)\n", emsg, rc);
2076 }
2077
2078 void ahci_print_info(struct ata_host *host, const char *scc_s)
2079 {
2080 struct ahci_host_priv *hpriv = host->private_data;
2081 void __iomem *mmio = hpriv->mmio;
2082 u32 vers, cap, cap2, impl, speed;
2083 const char *speed_s;
2084
2085 vers = readl(mmio + HOST_VERSION);
2086 cap = hpriv->cap;
2087 cap2 = hpriv->cap2;
2088 impl = hpriv->port_map;
2089
2090 speed = (cap >> 20) & 0xf;
2091 if (speed == 1)
2092 speed_s = "1.5";
2093 else if (speed == 2)
2094 speed_s = "3";
2095 else if (speed == 3)
2096 speed_s = "6";
2097 else
2098 speed_s = "?";
2099
2100 dev_info(host->dev,
2101 "AHCI %02x%02x.%02x%02x "
2102 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2103 ,
2104
2105 (vers >> 24) & 0xff,
2106 (vers >> 16) & 0xff,
2107 (vers >> 8) & 0xff,
2108 vers & 0xff,
2109
2110 ((cap >> 8) & 0x1f) + 1,
2111 (cap & 0x1f) + 1,
2112 speed_s,
2113 impl,
2114 scc_s);
2115
2116 dev_info(host->dev,
2117 "flags: "
2118 "%s%s%s%s%s%s%s"
2119 "%s%s%s%s%s%s%s"
2120 "%s%s%s%s%s%s\n"
2121 ,
2122
2123 cap & HOST_CAP_64 ? "64bit " : "",
2124 cap & HOST_CAP_NCQ ? "ncq " : "",
2125 cap & HOST_CAP_SNTF ? "sntf " : "",
2126 cap & HOST_CAP_MPS ? "ilck " : "",
2127 cap & HOST_CAP_SSS ? "stag " : "",
2128 cap & HOST_CAP_ALPM ? "pm " : "",
2129 cap & HOST_CAP_LED ? "led " : "",
2130 cap & HOST_CAP_CLO ? "clo " : "",
2131 cap & HOST_CAP_ONLY ? "only " : "",
2132 cap & HOST_CAP_PMP ? "pmp " : "",
2133 cap & HOST_CAP_FBS ? "fbs " : "",
2134 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2135 cap & HOST_CAP_SSC ? "slum " : "",
2136 cap & HOST_CAP_PART ? "part " : "",
2137 cap & HOST_CAP_CCC ? "ccc " : "",
2138 cap & HOST_CAP_EMS ? "ems " : "",
2139 cap & HOST_CAP_SXS ? "sxs " : "",
2140 cap2 & HOST_CAP2_APST ? "apst " : "",
2141 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2142 cap2 & HOST_CAP2_BOH ? "boh " : ""
2143 );
2144 }
2145 EXPORT_SYMBOL_GPL(ahci_print_info);
2146
2147 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2148 struct ata_port_info *pi)
2149 {
2150 u8 messages;
2151 void __iomem *mmio = hpriv->mmio;
2152 u32 em_loc = readl(mmio + HOST_EM_LOC);
2153 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2154
2155 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2156 return;
2157
2158 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2159
2160 if (messages) {
2161 /* store em_loc */
2162 hpriv->em_loc = ((em_loc >> 16) * 4);
2163 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2164 hpriv->em_msg_type = messages;
2165 pi->flags |= ATA_FLAG_EM;
2166 if (!(em_ctl & EM_CTL_ALHD))
2167 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2168 }
2169 }
2170 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2171
2172 MODULE_AUTHOR("Jeff Garzik");
2173 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2174 MODULE_LICENSE("GPL");
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