?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
irqchip/atmel-aic: Remove duplicate bit operation
[linux-2.6/btrfs-unstable.git] / drivers / ata / libahci.c
blobd61740e78d6dc93a1b17d9e3c9d9425067190a21
1 /*
2 * libahci.c - Common AHCI SATA low-level routines
3 *
4 * Maintained by: Tejun Heo <tj@kernel.org>
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/blkdev.h>
39 #include <linux/delay.h>
40 #include <linux/interrupt.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/device.h>
43 #include <scsi/scsi_host.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <linux/libata.h>
46 #include <linux/pci.h>
47 #include "ahci.h"
48 #include "libata.h"
49
50 static int ahci_skip_host_reset;
51 int ahci_ignore_sss;
52 EXPORT_SYMBOL_GPL(ahci_ignore_sss);
53
54 module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
55 MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
56
57 module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
58 MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
59
60 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
61 unsigned hints);
62 static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
63 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
64 size_t size);
65 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
66 ssize_t size);
67
68
69
70 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
71 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
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_set_aggressive_devslp(struct ata_port *ap, bool sleep);
80 static void ahci_enable_fbs(struct ata_port *ap);
81 static void ahci_disable_fbs(struct ata_port *ap);
82 static void ahci_pmp_attach(struct ata_port *ap);
83 static void ahci_pmp_detach(struct ata_port *ap);
84 static int ahci_softreset(struct ata_link *link, unsigned int *class,
85 unsigned long deadline);
86 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
87 unsigned long deadline);
88 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
89 unsigned long deadline);
90 static void ahci_postreset(struct ata_link *link, unsigned int *class);
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 .transmit_led_message = ahci_transmit_led_message,
175 #ifdef CONFIG_PM
176 .port_suspend = ahci_port_suspend,
177 .port_resume = ahci_port_resume,
178 #endif
179 .port_start = ahci_port_start,
180 .port_stop = ahci_port_stop,
181 };
182 EXPORT_SYMBOL_GPL(ahci_ops);
183
184 struct ata_port_operations ahci_pmp_retry_srst_ops = {
185 .inherits = &ahci_ops,
186 .softreset = ahci_pmp_retry_softreset,
187 };
188 EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
189
190 static bool ahci_em_messages __read_mostly = true;
191 EXPORT_SYMBOL_GPL(ahci_em_messages);
192 module_param(ahci_em_messages, bool, 0444);
193 /* add other LED protocol types when they become supported */
194 MODULE_PARM_DESC(ahci_em_messages,
195 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
196
197 /* device sleep idle timeout in ms */
198 static int devslp_idle_timeout __read_mostly = 1000;
199 module_param(devslp_idle_timeout, int, 0644);
200 MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
201
202 static void ahci_enable_ahci(void __iomem *mmio)
203 {
204 int i;
205 u32 tmp;
206
207 /* turn on AHCI_EN */
208 tmp = readl(mmio + HOST_CTL);
209 if (tmp & HOST_AHCI_EN)
210 return;
211
212 /* Some controllers need AHCI_EN to be written multiple times.
213 * Try a few times before giving up.
214 */
215 for (i = 0; i < 5; i++) {
216 tmp |= HOST_AHCI_EN;
217 writel(tmp, mmio + HOST_CTL);
218 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
219 if (tmp & HOST_AHCI_EN)
220 return;
221 msleep(10);
222 }
223
224 WARN_ON(1);
225 }
226
227 static ssize_t ahci_show_host_caps(struct device *dev,
228 struct device_attribute *attr, char *buf)
229 {
230 struct Scsi_Host *shost = class_to_shost(dev);
231 struct ata_port *ap = ata_shost_to_port(shost);
232 struct ahci_host_priv *hpriv = ap->host->private_data;
233
234 return sprintf(buf, "%x\n", hpriv->cap);
235 }
236
237 static ssize_t ahci_show_host_cap2(struct device *dev,
238 struct device_attribute *attr, char *buf)
239 {
240 struct Scsi_Host *shost = class_to_shost(dev);
241 struct ata_port *ap = ata_shost_to_port(shost);
242 struct ahci_host_priv *hpriv = ap->host->private_data;
243
244 return sprintf(buf, "%x\n", hpriv->cap2);
245 }
246
247 static ssize_t ahci_show_host_version(struct device *dev,
248 struct device_attribute *attr, char *buf)
249 {
250 struct Scsi_Host *shost = class_to_shost(dev);
251 struct ata_port *ap = ata_shost_to_port(shost);
252 struct ahci_host_priv *hpriv = ap->host->private_data;
253 void __iomem *mmio = hpriv->mmio;
254
255 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
256 }
257
258 static ssize_t ahci_show_port_cmd(struct device *dev,
259 struct device_attribute *attr, char *buf)
260 {
261 struct Scsi_Host *shost = class_to_shost(dev);
262 struct ata_port *ap = ata_shost_to_port(shost);
263 void __iomem *port_mmio = ahci_port_base(ap);
264
265 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
266 }
267
268 static ssize_t ahci_read_em_buffer(struct device *dev,
269 struct device_attribute *attr, char *buf)
270 {
271 struct Scsi_Host *shost = class_to_shost(dev);
272 struct ata_port *ap = ata_shost_to_port(shost);
273 struct ahci_host_priv *hpriv = ap->host->private_data;
274 void __iomem *mmio = hpriv->mmio;
275 void __iomem *em_mmio = mmio + hpriv->em_loc;
276 u32 em_ctl, msg;
277 unsigned long flags;
278 size_t count;
279 int i;
280
281 spin_lock_irqsave(ap->lock, flags);
282
283 em_ctl = readl(mmio + HOST_EM_CTL);
284 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
285 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
286 spin_unlock_irqrestore(ap->lock, flags);
287 return -EINVAL;
288 }
289
290 if (!(em_ctl & EM_CTL_MR)) {
291 spin_unlock_irqrestore(ap->lock, flags);
292 return -EAGAIN;
293 }
294
295 if (!(em_ctl & EM_CTL_SMB))
296 em_mmio += hpriv->em_buf_sz;
297
298 count = hpriv->em_buf_sz;
299
300 /* the count should not be larger than PAGE_SIZE */
301 if (count > PAGE_SIZE) {
302 if (printk_ratelimit())
303 ata_port_warn(ap,
304 "EM read buffer size too large: "
305 "buffer size %u, page size %lu\n",
306 hpriv->em_buf_sz, PAGE_SIZE);
307 count = PAGE_SIZE;
308 }
309
310 for (i = 0; i < count; i += 4) {
311 msg = readl(em_mmio + i);
312 buf[i] = msg & 0xff;
313 buf[i + 1] = (msg >> 8) & 0xff;
314 buf[i + 2] = (msg >> 16) & 0xff;
315 buf[i + 3] = (msg >> 24) & 0xff;
316 }
317
318 spin_unlock_irqrestore(ap->lock, flags);
319
320 return i;
321 }
322
323 static ssize_t ahci_store_em_buffer(struct device *dev,
324 struct device_attribute *attr,
325 const char *buf, size_t size)
326 {
327 struct Scsi_Host *shost = class_to_shost(dev);
328 struct ata_port *ap = ata_shost_to_port(shost);
329 struct ahci_host_priv *hpriv = ap->host->private_data;
330 void __iomem *mmio = hpriv->mmio;
331 void __iomem *em_mmio = mmio + hpriv->em_loc;
332 const unsigned char *msg_buf = buf;
333 u32 em_ctl, msg;
334 unsigned long flags;
335 int i;
336
337 /* check size validity */
338 if (!(ap->flags & ATA_FLAG_EM) ||
339 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
340 size % 4 || size > hpriv->em_buf_sz)
341 return -EINVAL;
342
343 spin_lock_irqsave(ap->lock, flags);
344
345 em_ctl = readl(mmio + HOST_EM_CTL);
346 if (em_ctl & EM_CTL_TM) {
347 spin_unlock_irqrestore(ap->lock, flags);
348 return -EBUSY;
349 }
350
351 for (i = 0; i < size; i += 4) {
352 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
353 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
354 writel(msg, em_mmio + i);
355 }
356
357 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
358
359 spin_unlock_irqrestore(ap->lock, flags);
360
361 return size;
362 }
363
364 static ssize_t ahci_show_em_supported(struct device *dev,
365 struct device_attribute *attr, char *buf)
366 {
367 struct Scsi_Host *shost = class_to_shost(dev);
368 struct ata_port *ap = ata_shost_to_port(shost);
369 struct ahci_host_priv *hpriv = ap->host->private_data;
370 void __iomem *mmio = hpriv->mmio;
371 u32 em_ctl;
372
373 em_ctl = readl(mmio + HOST_EM_CTL);
374
375 return sprintf(buf, "%s%s%s%s\n",
376 em_ctl & EM_CTL_LED ? "led " : "",
377 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
378 em_ctl & EM_CTL_SES ? "ses-2 " : "",
379 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
380 }
381
382 /**
383 * ahci_save_initial_config - Save and fixup initial config values
384 * @dev: target AHCI device
385 * @hpriv: host private area to store config values
386 *
387 * Some registers containing configuration info might be setup by
388 * BIOS and might be cleared on reset. This function saves the
389 * initial values of those registers into @hpriv such that they
390 * can be restored after controller reset.
391 *
392 * If inconsistent, config values are fixed up by this function.
393 *
394 * If it is not set already this function sets hpriv->start_engine to
395 * ahci_start_engine.
396 *
397 * LOCKING:
398 * None.
399 */
400 void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
401 {
402 void __iomem *mmio = hpriv->mmio;
403 u32 cap, cap2, vers, port_map;
404 int i;
405
406 /* make sure AHCI mode is enabled before accessing CAP */
407 ahci_enable_ahci(mmio);
408
409 /* Values prefixed with saved_ are written back to host after
410 * reset. Values without are used for driver operation.
411 */
412 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
413 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
414
415 /* CAP2 register is only defined for AHCI 1.2 and later */
416 vers = readl(mmio + HOST_VERSION);
417 if ((vers >> 16) > 1 ||
418 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
419 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
420 else
421 hpriv->saved_cap2 = cap2 = 0;
422
423 /* some chips have errata preventing 64bit use */
424 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
425 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
426 cap &= ~HOST_CAP_64;
427 }
428
429 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
430 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
431 cap &= ~HOST_CAP_NCQ;
432 }
433
434 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
435 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
436 cap |= HOST_CAP_NCQ;
437 }
438
439 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
440 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
441 cap &= ~HOST_CAP_PMP;
442 }
443
444 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
445 dev_info(dev,
446 "controller can't do SNTF, turning off CAP_SNTF\n");
447 cap &= ~HOST_CAP_SNTF;
448 }
449
450 if ((cap2 & HOST_CAP2_SDS) && (hpriv->flags & AHCI_HFLAG_NO_DEVSLP)) {
451 dev_info(dev,
452 "controller can't do DEVSLP, turning off\n");
453 cap2 &= ~HOST_CAP2_SDS;
454 cap2 &= ~HOST_CAP2_SADM;
455 }
456
457 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
458 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
459 cap |= HOST_CAP_FBS;
460 }
461
462 if ((cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_NO_FBS)) {
463 dev_info(dev, "controller can't do FBS, turning off CAP_FBS\n");
464 cap &= ~HOST_CAP_FBS;
465 }
466
467 if (hpriv->force_port_map && port_map != hpriv->force_port_map) {
468 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
469 port_map, hpriv->force_port_map);
470 port_map = hpriv->force_port_map;
471 }
472
473 if (hpriv->mask_port_map) {
474 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
475 port_map,
476 port_map & hpriv->mask_port_map);
477 port_map &= hpriv->mask_port_map;
478 }
479
480 /* cross check port_map and cap.n_ports */
481 if (port_map) {
482 int map_ports = 0;
483
484 for (i = 0; i < AHCI_MAX_PORTS; i++)
485 if (port_map & (1 << i))
486 map_ports++;
487
488 /* If PI has more ports than n_ports, whine, clear
489 * port_map and let it be generated from n_ports.
490 */
491 if (map_ports > ahci_nr_ports(cap)) {
492 dev_warn(dev,
493 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
494 port_map, ahci_nr_ports(cap));
495 port_map = 0;
496 }
497 }
498
499 /* fabricate port_map from cap.nr_ports */
500 if (!port_map) {
501 port_map = (1 << ahci_nr_ports(cap)) - 1;
502 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
503
504 /* write the fixed up value to the PI register */
505 hpriv->saved_port_map = port_map;
506 }
507
508 /* record values to use during operation */
509 hpriv->cap = cap;
510 hpriv->cap2 = cap2;
511 hpriv->port_map = port_map;
512
513 if (!hpriv->start_engine)
514 hpriv->start_engine = ahci_start_engine;
515 }
516 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
517
518 /**
519 * ahci_restore_initial_config - Restore initial config
520 * @host: target ATA host
521 *
522 * Restore initial config stored by ahci_save_initial_config().
523 *
524 * LOCKING:
525 * None.
526 */
527 static void ahci_restore_initial_config(struct ata_host *host)
528 {
529 struct ahci_host_priv *hpriv = host->private_data;
530 void __iomem *mmio = hpriv->mmio;
531
532 writel(hpriv->saved_cap, mmio + HOST_CAP);
533 if (hpriv->saved_cap2)
534 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
535 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
536 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
537 }
538
539 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
540 {
541 static const int offset[] = {
542 [SCR_STATUS] = PORT_SCR_STAT,
543 [SCR_CONTROL] = PORT_SCR_CTL,
544 [SCR_ERROR] = PORT_SCR_ERR,
545 [SCR_ACTIVE] = PORT_SCR_ACT,
546 [SCR_NOTIFICATION] = PORT_SCR_NTF,
547 };
548 struct ahci_host_priv *hpriv = ap->host->private_data;
549
550 if (sc_reg < ARRAY_SIZE(offset) &&
551 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
552 return offset[sc_reg];
553 return 0;
554 }
555
556 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
557 {
558 void __iomem *port_mmio = ahci_port_base(link->ap);
559 int offset = ahci_scr_offset(link->ap, sc_reg);
560
561 if (offset) {
562 *val = readl(port_mmio + offset);
563 return 0;
564 }
565 return -EINVAL;
566 }
567
568 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
569 {
570 void __iomem *port_mmio = ahci_port_base(link->ap);
571 int offset = ahci_scr_offset(link->ap, sc_reg);
572
573 if (offset) {
574 writel(val, port_mmio + offset);
575 return 0;
576 }
577 return -EINVAL;
578 }
579
580 void ahci_start_engine(struct ata_port *ap)
581 {
582 void __iomem *port_mmio = ahci_port_base(ap);
583 u32 tmp;
584
585 /* start DMA */
586 tmp = readl(port_mmio + PORT_CMD);
587 tmp |= PORT_CMD_START;
588 writel(tmp, port_mmio + PORT_CMD);
589 readl(port_mmio + PORT_CMD); /* flush */
590 }
591 EXPORT_SYMBOL_GPL(ahci_start_engine);
592
593 int ahci_stop_engine(struct ata_port *ap)
594 {
595 void __iomem *port_mmio = ahci_port_base(ap);
596 u32 tmp;
597
598 tmp = readl(port_mmio + PORT_CMD);
599
600 /* check if the HBA is idle */
601 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
602 return 0;
603
604 /* setting HBA to idle */
605 tmp &= ~PORT_CMD_START;
606 writel(tmp, port_mmio + PORT_CMD);
607
608 /* wait for engine to stop. This could be as long as 500 msec */
609 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
610 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
611 if (tmp & PORT_CMD_LIST_ON)
612 return -EIO;
613
614 return 0;
615 }
616 EXPORT_SYMBOL_GPL(ahci_stop_engine);
617
618 void ahci_start_fis_rx(struct ata_port *ap)
619 {
620 void __iomem *port_mmio = ahci_port_base(ap);
621 struct ahci_host_priv *hpriv = ap->host->private_data;
622 struct ahci_port_priv *pp = ap->private_data;
623 u32 tmp;
624
625 /* set FIS registers */
626 if (hpriv->cap & HOST_CAP_64)
627 writel((pp->cmd_slot_dma >> 16) >> 16,
628 port_mmio + PORT_LST_ADDR_HI);
629 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
630
631 if (hpriv->cap & HOST_CAP_64)
632 writel((pp->rx_fis_dma >> 16) >> 16,
633 port_mmio + PORT_FIS_ADDR_HI);
634 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
635
636 /* enable FIS reception */
637 tmp = readl(port_mmio + PORT_CMD);
638 tmp |= PORT_CMD_FIS_RX;
639 writel(tmp, port_mmio + PORT_CMD);
640
641 /* flush */
642 readl(port_mmio + PORT_CMD);
643 }
644 EXPORT_SYMBOL_GPL(ahci_start_fis_rx);
645
646 static int ahci_stop_fis_rx(struct ata_port *ap)
647 {
648 void __iomem *port_mmio = ahci_port_base(ap);
649 u32 tmp;
650
651 /* disable FIS reception */
652 tmp = readl(port_mmio + PORT_CMD);
653 tmp &= ~PORT_CMD_FIS_RX;
654 writel(tmp, port_mmio + PORT_CMD);
655
656 /* wait for completion, spec says 500ms, give it 1000 */
657 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
658 PORT_CMD_FIS_ON, 10, 1000);
659 if (tmp & PORT_CMD_FIS_ON)
660 return -EBUSY;
661
662 return 0;
663 }
664
665 static void ahci_power_up(struct ata_port *ap)
666 {
667 struct ahci_host_priv *hpriv = ap->host->private_data;
668 void __iomem *port_mmio = ahci_port_base(ap);
669 u32 cmd;
670
671 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
672
673 /* spin up device */
674 if (hpriv->cap & HOST_CAP_SSS) {
675 cmd |= PORT_CMD_SPIN_UP;
676 writel(cmd, port_mmio + PORT_CMD);
677 }
678
679 /* wake up link */
680 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
681 }
682
683 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
684 unsigned int hints)
685 {
686 struct ata_port *ap = link->ap;
687 struct ahci_host_priv *hpriv = ap->host->private_data;
688 struct ahci_port_priv *pp = ap->private_data;
689 void __iomem *port_mmio = ahci_port_base(ap);
690
691 if (policy != ATA_LPM_MAX_POWER) {
692 /*
693 * Disable interrupts on Phy Ready. This keeps us from
694 * getting woken up due to spurious phy ready
695 * interrupts.
696 */
697 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
698 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
699
700 sata_link_scr_lpm(link, policy, false);
701 }
702
703 if (hpriv->cap & HOST_CAP_ALPM) {
704 u32 cmd = readl(port_mmio + PORT_CMD);
705
706 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
707 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
708 cmd |= PORT_CMD_ICC_ACTIVE;
709
710 writel(cmd, port_mmio + PORT_CMD);
711 readl(port_mmio + PORT_CMD);
712
713 /* wait 10ms to be sure we've come out of LPM state */
714 ata_msleep(ap, 10);
715 } else {
716 cmd |= PORT_CMD_ALPE;
717 if (policy == ATA_LPM_MIN_POWER)
718 cmd |= PORT_CMD_ASP;
719
720 /* write out new cmd value */
721 writel(cmd, port_mmio + PORT_CMD);
722 }
723 }
724
725 /* set aggressive device sleep */
726 if ((hpriv->cap2 & HOST_CAP2_SDS) &&
727 (hpriv->cap2 & HOST_CAP2_SADM) &&
728 (link->device->flags & ATA_DFLAG_DEVSLP)) {
729 if (policy == ATA_LPM_MIN_POWER)
730 ahci_set_aggressive_devslp(ap, true);
731 else
732 ahci_set_aggressive_devslp(ap, false);
733 }
734
735 if (policy == ATA_LPM_MAX_POWER) {
736 sata_link_scr_lpm(link, policy, false);
737
738 /* turn PHYRDY IRQ back on */
739 pp->intr_mask |= PORT_IRQ_PHYRDY;
740 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
741 }
742
743 return 0;
744 }
745
746 #ifdef CONFIG_PM
747 static void ahci_power_down(struct ata_port *ap)
748 {
749 struct ahci_host_priv *hpriv = ap->host->private_data;
750 void __iomem *port_mmio = ahci_port_base(ap);
751 u32 cmd, scontrol;
752
753 if (!(hpriv->cap & HOST_CAP_SSS))
754 return;
755
756 /* put device into listen mode, first set PxSCTL.DET to 0 */
757 scontrol = readl(port_mmio + PORT_SCR_CTL);
758 scontrol &= ~0xf;
759 writel(scontrol, port_mmio + PORT_SCR_CTL);
760
761 /* then set PxCMD.SUD to 0 */
762 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
763 cmd &= ~PORT_CMD_SPIN_UP;
764 writel(cmd, port_mmio + PORT_CMD);
765 }
766 #endif
767
768 static void ahci_start_port(struct ata_port *ap)
769 {
770 struct ahci_host_priv *hpriv = ap->host->private_data;
771 struct ahci_port_priv *pp = ap->private_data;
772 struct ata_link *link;
773 struct ahci_em_priv *emp;
774 ssize_t rc;
775 int i;
776
777 /* enable FIS reception */
778 ahci_start_fis_rx(ap);
779
780 /* enable DMA */
781 if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
782 hpriv->start_engine(ap);
783
784 /* turn on LEDs */
785 if (ap->flags & ATA_FLAG_EM) {
786 ata_for_each_link(link, ap, EDGE) {
787 emp = &pp->em_priv[link->pmp];
788
789 /* EM Transmit bit maybe busy during init */
790 for (i = 0; i < EM_MAX_RETRY; i++) {
791 rc = ap->ops->transmit_led_message(ap,
792 emp->led_state,
793 4);
794 /*
795 * If busy, give a breather but do not
796 * release EH ownership by using msleep()
797 * instead of ata_msleep(). EM Transmit
798 * bit is busy for the whole host and
799 * releasing ownership will cause other
800 * ports to fail the same way.
801 */
802 if (rc == -EBUSY)
803 msleep(1);
804 else
805 break;
806 }
807 }
808 }
809
810 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
811 ata_for_each_link(link, ap, EDGE)
812 ahci_init_sw_activity(link);
813
814 }
815
816 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
817 {
818 int rc;
819
820 /* disable DMA */
821 rc = ahci_stop_engine(ap);
822 if (rc) {
823 *emsg = "failed to stop engine";
824 return rc;
825 }
826
827 /* disable FIS reception */
828 rc = ahci_stop_fis_rx(ap);
829 if (rc) {
830 *emsg = "failed stop FIS RX";
831 return rc;
832 }
833
834 return 0;
835 }
836
837 int ahci_reset_controller(struct ata_host *host)
838 {
839 struct ahci_host_priv *hpriv = host->private_data;
840 void __iomem *mmio = hpriv->mmio;
841 u32 tmp;
842
843 /* we must be in AHCI mode, before using anything
844 * AHCI-specific, such as HOST_RESET.
845 */
846 ahci_enable_ahci(mmio);
847
848 /* global controller reset */
849 if (!ahci_skip_host_reset) {
850 tmp = readl(mmio + HOST_CTL);
851 if ((tmp & HOST_RESET) == 0) {
852 writel(tmp | HOST_RESET, mmio + HOST_CTL);
853 readl(mmio + HOST_CTL); /* flush */
854 }
855
856 /*
857 * to perform host reset, OS should set HOST_RESET
858 * and poll until this bit is read to be "0".
859 * reset must complete within 1 second, or
860 * the hardware should be considered fried.
861 */
862 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
863 HOST_RESET, 10, 1000);
864
865 if (tmp & HOST_RESET) {
866 dev_err(host->dev, "controller reset failed (0x%x)\n",
867 tmp);
868 return -EIO;
869 }
870
871 /* turn on AHCI mode */
872 ahci_enable_ahci(mmio);
873
874 /* Some registers might be cleared on reset. Restore
875 * initial values.
876 */
877 ahci_restore_initial_config(host);
878 } else
879 dev_info(host->dev, "skipping global host reset\n");
880
881 return 0;
882 }
883 EXPORT_SYMBOL_GPL(ahci_reset_controller);
884
885 static void ahci_sw_activity(struct ata_link *link)
886 {
887 struct ata_port *ap = link->ap;
888 struct ahci_port_priv *pp = ap->private_data;
889 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
890
891 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
892 return;
893
894 emp->activity++;
895 if (!timer_pending(&emp->timer))
896 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
897 }
898
899 static void ahci_sw_activity_blink(unsigned long arg)
900 {
901 struct ata_link *link = (struct ata_link *)arg;
902 struct ata_port *ap = link->ap;
903 struct ahci_port_priv *pp = ap->private_data;
904 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
905 unsigned long led_message = emp->led_state;
906 u32 activity_led_state;
907 unsigned long flags;
908
909 led_message &= EM_MSG_LED_VALUE;
910 led_message |= ap->port_no | (link->pmp << 8);
911
912 /* check to see if we've had activity. If so,
913 * toggle state of LED and reset timer. If not,
914 * turn LED to desired idle state.
915 */
916 spin_lock_irqsave(ap->lock, flags);
917 if (emp->saved_activity != emp->activity) {
918 emp->saved_activity = emp->activity;
919 /* get the current LED state */
920 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
921
922 if (activity_led_state)
923 activity_led_state = 0;
924 else
925 activity_led_state = 1;
926
927 /* clear old state */
928 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
929
930 /* toggle state */
931 led_message |= (activity_led_state << 16);
932 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
933 } else {
934 /* switch to idle */
935 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
936 if (emp->blink_policy == BLINK_OFF)
937 led_message |= (1 << 16);
938 }
939 spin_unlock_irqrestore(ap->lock, flags);
940 ap->ops->transmit_led_message(ap, led_message, 4);
941 }
942
943 static void ahci_init_sw_activity(struct ata_link *link)
944 {
945 struct ata_port *ap = link->ap;
946 struct ahci_port_priv *pp = ap->private_data;
947 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
948
949 /* init activity stats, setup timer */
950 emp->saved_activity = emp->activity = 0;
951 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
952
953 /* check our blink policy and set flag for link if it's enabled */
954 if (emp->blink_policy)
955 link->flags |= ATA_LFLAG_SW_ACTIVITY;
956 }
957
958 int ahci_reset_em(struct ata_host *host)
959 {
960 struct ahci_host_priv *hpriv = host->private_data;
961 void __iomem *mmio = hpriv->mmio;
962 u32 em_ctl;
963
964 em_ctl = readl(mmio + HOST_EM_CTL);
965 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
966 return -EINVAL;
967
968 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
969 return 0;
970 }
971 EXPORT_SYMBOL_GPL(ahci_reset_em);
972
973 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
974 ssize_t size)
975 {
976 struct ahci_host_priv *hpriv = ap->host->private_data;
977 struct ahci_port_priv *pp = ap->private_data;
978 void __iomem *mmio = hpriv->mmio;
979 u32 em_ctl;
980 u32 message[] = {0, 0};
981 unsigned long flags;
982 int pmp;
983 struct ahci_em_priv *emp;
984
985 /* get the slot number from the message */
986 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
987 if (pmp < EM_MAX_SLOTS)
988 emp = &pp->em_priv[pmp];
989 else
990 return -EINVAL;
991
992 spin_lock_irqsave(ap->lock, flags);
993
994 /*
995 * if we are still busy transmitting a previous message,
996 * do not allow
997 */
998 em_ctl = readl(mmio + HOST_EM_CTL);
999 if (em_ctl & EM_CTL_TM) {
1000 spin_unlock_irqrestore(ap->lock, flags);
1001 return -EBUSY;
1002 }
1003
1004 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
1005 /*
1006 * create message header - this is all zero except for
1007 * the message size, which is 4 bytes.
1008 */
1009 message[0] |= (4 << 8);
1010
1011 /* ignore 0:4 of byte zero, fill in port info yourself */
1012 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
1013
1014 /* write message to EM_LOC */
1015 writel(message[0], mmio + hpriv->em_loc);
1016 writel(message[1], mmio + hpriv->em_loc+4);
1017
1018 /*
1019 * tell hardware to transmit the message
1020 */
1021 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1022 }
1023
1024 /* save off new led state for port/slot */
1025 emp->led_state = state;
1026
1027 spin_unlock_irqrestore(ap->lock, flags);
1028 return size;
1029 }
1030
1031 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1032 {
1033 struct ahci_port_priv *pp = ap->private_data;
1034 struct ata_link *link;
1035 struct ahci_em_priv *emp;
1036 int rc = 0;
1037
1038 ata_for_each_link(link, ap, EDGE) {
1039 emp = &pp->em_priv[link->pmp];
1040 rc += sprintf(buf, "%lx\n", emp->led_state);
1041 }
1042 return rc;
1043 }
1044
1045 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1046 size_t size)
1047 {
1048 unsigned int state;
1049 int pmp;
1050 struct ahci_port_priv *pp = ap->private_data;
1051 struct ahci_em_priv *emp;
1052
1053 if (kstrtouint(buf, 0, &state) < 0)
1054 return -EINVAL;
1055
1056 /* get the slot number from the message */
1057 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1058 if (pmp < EM_MAX_SLOTS)
1059 emp = &pp->em_priv[pmp];
1060 else
1061 return -EINVAL;
1062
1063 /* mask off the activity bits if we are in sw_activity
1064 * mode, user should turn off sw_activity before setting
1065 * activity led through em_message
1066 */
1067 if (emp->blink_policy)
1068 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1069
1070 return ap->ops->transmit_led_message(ap, state, size);
1071 }
1072
1073 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1074 {
1075 struct ata_link *link = dev->link;
1076 struct ata_port *ap = link->ap;
1077 struct ahci_port_priv *pp = ap->private_data;
1078 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1079 u32 port_led_state = emp->led_state;
1080
1081 /* save the desired Activity LED behavior */
1082 if (val == OFF) {
1083 /* clear LFLAG */
1084 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1085
1086 /* set the LED to OFF */
1087 port_led_state &= EM_MSG_LED_VALUE_OFF;
1088 port_led_state |= (ap->port_no | (link->pmp << 8));
1089 ap->ops->transmit_led_message(ap, port_led_state, 4);
1090 } else {
1091 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1092 if (val == BLINK_OFF) {
1093 /* set LED to ON for idle */
1094 port_led_state &= EM_MSG_LED_VALUE_OFF;
1095 port_led_state |= (ap->port_no | (link->pmp << 8));
1096 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1097 ap->ops->transmit_led_message(ap, port_led_state, 4);
1098 }
1099 }
1100 emp->blink_policy = val;
1101 return 0;
1102 }
1103
1104 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1105 {
1106 struct ata_link *link = dev->link;
1107 struct ata_port *ap = link->ap;
1108 struct ahci_port_priv *pp = ap->private_data;
1109 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1110
1111 /* display the saved value of activity behavior for this
1112 * disk.
1113 */
1114 return sprintf(buf, "%d\n", emp->blink_policy);
1115 }
1116
1117 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1118 int port_no, void __iomem *mmio,
1119 void __iomem *port_mmio)
1120 {
1121 struct ahci_host_priv *hpriv = ap->host->private_data;
1122 const char *emsg = NULL;
1123 int rc;
1124 u32 tmp;
1125
1126 /* make sure port is not active */
1127 rc = ahci_deinit_port(ap, &emsg);
1128 if (rc)
1129 dev_warn(dev, "%s (%d)\n", emsg, rc);
1130
1131 /* clear SError */
1132 tmp = readl(port_mmio + PORT_SCR_ERR);
1133 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1134 writel(tmp, port_mmio + PORT_SCR_ERR);
1135
1136 /* clear port IRQ */
1137 tmp = readl(port_mmio + PORT_IRQ_STAT);
1138 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1139 if (tmp)
1140 writel(tmp, port_mmio + PORT_IRQ_STAT);
1141
1142 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1143
1144 /* mark esata ports */
1145 tmp = readl(port_mmio + PORT_CMD);
1146 if ((tmp & PORT_CMD_HPCP) ||
1147 ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS)))
1148 ap->pflags |= ATA_PFLAG_EXTERNAL;
1149 }
1150
1151 void ahci_init_controller(struct ata_host *host)
1152 {
1153 struct ahci_host_priv *hpriv = host->private_data;
1154 void __iomem *mmio = hpriv->mmio;
1155 int i;
1156 void __iomem *port_mmio;
1157 u32 tmp;
1158
1159 for (i = 0; i < host->n_ports; i++) {
1160 struct ata_port *ap = host->ports[i];
1161
1162 port_mmio = ahci_port_base(ap);
1163 if (ata_port_is_dummy(ap))
1164 continue;
1165
1166 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1167 }
1168
1169 tmp = readl(mmio + HOST_CTL);
1170 VPRINTK("HOST_CTL 0x%x\n", tmp);
1171 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1172 tmp = readl(mmio + HOST_CTL);
1173 VPRINTK("HOST_CTL 0x%x\n", tmp);
1174 }
1175 EXPORT_SYMBOL_GPL(ahci_init_controller);
1176
1177 static void ahci_dev_config(struct ata_device *dev)
1178 {
1179 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1180
1181 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1182 dev->max_sectors = 255;
1183 ata_dev_info(dev,
1184 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1185 }
1186 }
1187
1188 unsigned int ahci_dev_classify(struct ata_port *ap)
1189 {
1190 void __iomem *port_mmio = ahci_port_base(ap);
1191 struct ata_taskfile tf;
1192 u32 tmp;
1193
1194 tmp = readl(port_mmio + PORT_SIG);
1195 tf.lbah = (tmp >> 24) & 0xff;
1196 tf.lbam = (tmp >> 16) & 0xff;
1197 tf.lbal = (tmp >> 8) & 0xff;
1198 tf.nsect = (tmp) & 0xff;
1199
1200 return ata_dev_classify(&tf);
1201 }
1202 EXPORT_SYMBOL_GPL(ahci_dev_classify);
1203
1204 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1205 u32 opts)
1206 {
1207 dma_addr_t cmd_tbl_dma;
1208
1209 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1210
1211 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1212 pp->cmd_slot[tag].status = 0;
1213 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1214 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1215 }
1216 EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1217
1218 int ahci_kick_engine(struct ata_port *ap)
1219 {
1220 void __iomem *port_mmio = ahci_port_base(ap);
1221 struct ahci_host_priv *hpriv = ap->host->private_data;
1222 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1223 u32 tmp;
1224 int busy, rc;
1225
1226 /* stop engine */
1227 rc = ahci_stop_engine(ap);
1228 if (rc)
1229 goto out_restart;
1230
1231 /* need to do CLO?
1232 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1233 */
1234 busy = status & (ATA_BUSY | ATA_DRQ);
1235 if (!busy && !sata_pmp_attached(ap)) {
1236 rc = 0;
1237 goto out_restart;
1238 }
1239
1240 if (!(hpriv->cap & HOST_CAP_CLO)) {
1241 rc = -EOPNOTSUPP;
1242 goto out_restart;
1243 }
1244
1245 /* perform CLO */
1246 tmp = readl(port_mmio + PORT_CMD);
1247 tmp |= PORT_CMD_CLO;
1248 writel(tmp, port_mmio + PORT_CMD);
1249
1250 rc = 0;
1251 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1252 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1253 if (tmp & PORT_CMD_CLO)
1254 rc = -EIO;
1255
1256 /* restart engine */
1257 out_restart:
1258 hpriv->start_engine(ap);
1259 return rc;
1260 }
1261 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1262
1263 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1264 struct ata_taskfile *tf, int is_cmd, u16 flags,
1265 unsigned long timeout_msec)
1266 {
1267 const u32 cmd_fis_len = 5; /* five dwords */
1268 struct ahci_port_priv *pp = ap->private_data;
1269 void __iomem *port_mmio = ahci_port_base(ap);
1270 u8 *fis = pp->cmd_tbl;
1271 u32 tmp;
1272
1273 /* prep the command */
1274 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1275 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1276
1277 /* set port value for softreset of Port Multiplier */
1278 if (pp->fbs_enabled && pp->fbs_last_dev != pmp) {
1279 tmp = readl(port_mmio + PORT_FBS);
1280 tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1281 tmp |= pmp << PORT_FBS_DEV_OFFSET;
1282 writel(tmp, port_mmio + PORT_FBS);
1283 pp->fbs_last_dev = pmp;
1284 }
1285
1286 /* issue & wait */
1287 writel(1, port_mmio + PORT_CMD_ISSUE);
1288
1289 if (timeout_msec) {
1290 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1291 0x1, 0x1, 1, timeout_msec);
1292 if (tmp & 0x1) {
1293 ahci_kick_engine(ap);
1294 return -EBUSY;
1295 }
1296 } else
1297 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1298
1299 return 0;
1300 }
1301
1302 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1303 int pmp, unsigned long deadline,
1304 int (*check_ready)(struct ata_link *link))
1305 {
1306 struct ata_port *ap = link->ap;
1307 struct ahci_host_priv *hpriv = ap->host->private_data;
1308 struct ahci_port_priv *pp = ap->private_data;
1309 const char *reason = NULL;
1310 unsigned long now, msecs;
1311 struct ata_taskfile tf;
1312 bool fbs_disabled = false;
1313 int rc;
1314
1315 DPRINTK("ENTER\n");
1316
1317 /* prepare for SRST (AHCI-1.1 10.4.1) */
1318 rc = ahci_kick_engine(ap);
1319 if (rc && rc != -EOPNOTSUPP)
1320 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1321
1322 /*
1323 * According to AHCI-1.2 9.3.9: if FBS is enable, software shall
1324 * clear PxFBS.EN to '0' prior to issuing software reset to devices
1325 * that is attached to port multiplier.
1326 */
1327 if (!ata_is_host_link(link) && pp->fbs_enabled) {
1328 ahci_disable_fbs(ap);
1329 fbs_disabled = true;
1330 }
1331
1332 ata_tf_init(link->device, &tf);
1333
1334 /* issue the first D2H Register FIS */
1335 msecs = 0;
1336 now = jiffies;
1337 if (time_after(deadline, now))
1338 msecs = jiffies_to_msecs(deadline - now);
1339
1340 tf.ctl |= ATA_SRST;
1341 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1342 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1343 rc = -EIO;
1344 reason = "1st FIS failed";
1345 goto fail;
1346 }
1347
1348 /* spec says at least 5us, but be generous and sleep for 1ms */
1349 ata_msleep(ap, 1);
1350
1351 /* issue the second D2H Register FIS */
1352 tf.ctl &= ~ATA_SRST;
1353 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1354
1355 /* wait for link to become ready */
1356 rc = ata_wait_after_reset(link, deadline, check_ready);
1357 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1358 /*
1359 * Workaround for cases where link online status can't
1360 * be trusted. Treat device readiness timeout as link
1361 * offline.
1362 */
1363 ata_link_info(link, "device not ready, treating as offline\n");
1364 *class = ATA_DEV_NONE;
1365 } else if (rc) {
1366 /* link occupied, -ENODEV too is an error */
1367 reason = "device not ready";
1368 goto fail;
1369 } else
1370 *class = ahci_dev_classify(ap);
1371
1372 /* re-enable FBS if disabled before */
1373 if (fbs_disabled)
1374 ahci_enable_fbs(ap);
1375
1376 DPRINTK("EXIT, class=%u\n", *class);
1377 return 0;
1378
1379 fail:
1380 ata_link_err(link, "softreset failed (%s)\n", reason);
1381 return rc;
1382 }
1383
1384 int ahci_check_ready(struct ata_link *link)
1385 {
1386 void __iomem *port_mmio = ahci_port_base(link->ap);
1387 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1388
1389 return ata_check_ready(status);
1390 }
1391 EXPORT_SYMBOL_GPL(ahci_check_ready);
1392
1393 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1394 unsigned long deadline)
1395 {
1396 int pmp = sata_srst_pmp(link);
1397
1398 DPRINTK("ENTER\n");
1399
1400 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1401 }
1402 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1403
1404 static int ahci_bad_pmp_check_ready(struct ata_link *link)
1405 {
1406 void __iomem *port_mmio = ahci_port_base(link->ap);
1407 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1408 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1409
1410 /*
1411 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1412 * which can save timeout delay.
1413 */
1414 if (irq_status & PORT_IRQ_BAD_PMP)
1415 return -EIO;
1416
1417 return ata_check_ready(status);
1418 }
1419
1420 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1421 unsigned long deadline)
1422 {
1423 struct ata_port *ap = link->ap;
1424 void __iomem *port_mmio = ahci_port_base(ap);
1425 int pmp = sata_srst_pmp(link);
1426 int rc;
1427 u32 irq_sts;
1428
1429 DPRINTK("ENTER\n");
1430
1431 rc = ahci_do_softreset(link, class, pmp, deadline,
1432 ahci_bad_pmp_check_ready);
1433
1434 /*
1435 * Soft reset fails with IPMS set when PMP is enabled but
1436 * SATA HDD/ODD is connected to SATA port, do soft reset
1437 * again to port 0.
1438 */
1439 if (rc == -EIO) {
1440 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1441 if (irq_sts & PORT_IRQ_BAD_PMP) {
1442 ata_link_warn(link,
1443 "applying PMP SRST workaround "
1444 "and retrying\n");
1445 rc = ahci_do_softreset(link, class, 0, deadline,
1446 ahci_check_ready);
1447 }
1448 }
1449
1450 return rc;
1451 }
1452
1453 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1454 unsigned long deadline)
1455 {
1456 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1457 struct ata_port *ap = link->ap;
1458 struct ahci_port_priv *pp = ap->private_data;
1459 struct ahci_host_priv *hpriv = ap->host->private_data;
1460 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1461 struct ata_taskfile tf;
1462 bool online;
1463 int rc;
1464
1465 DPRINTK("ENTER\n");
1466
1467 ahci_stop_engine(ap);
1468
1469 /* clear D2H reception area to properly wait for D2H FIS */
1470 ata_tf_init(link->device, &tf);
1471 tf.command = ATA_BUSY;
1472 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1473
1474 rc = sata_link_hardreset(link, timing, deadline, &online,
1475 ahci_check_ready);
1476
1477 hpriv->start_engine(ap);
1478
1479 if (online)
1480 *class = ahci_dev_classify(ap);
1481
1482 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1483 return rc;
1484 }
1485
1486 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1487 {
1488 struct ata_port *ap = link->ap;
1489 void __iomem *port_mmio = ahci_port_base(ap);
1490 u32 new_tmp, tmp;
1491
1492 ata_std_postreset(link, class);
1493
1494 /* Make sure port's ATAPI bit is set appropriately */
1495 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1496 if (*class == ATA_DEV_ATAPI)
1497 new_tmp |= PORT_CMD_ATAPI;
1498 else
1499 new_tmp &= ~PORT_CMD_ATAPI;
1500 if (new_tmp != tmp) {
1501 writel(new_tmp, port_mmio + PORT_CMD);
1502 readl(port_mmio + PORT_CMD); /* flush */
1503 }
1504 }
1505
1506 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1507 {
1508 struct scatterlist *sg;
1509 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1510 unsigned int si;
1511
1512 VPRINTK("ENTER\n");
1513
1514 /*
1515 * Next, the S/G list.
1516 */
1517 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1518 dma_addr_t addr = sg_dma_address(sg);
1519 u32 sg_len = sg_dma_len(sg);
1520
1521 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1522 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1523 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1524 }
1525
1526 return si;
1527 }
1528
1529 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1530 {
1531 struct ata_port *ap = qc->ap;
1532 struct ahci_port_priv *pp = ap->private_data;
1533
1534 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1535 return ata_std_qc_defer(qc);
1536 else
1537 return sata_pmp_qc_defer_cmd_switch(qc);
1538 }
1539
1540 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1541 {
1542 struct ata_port *ap = qc->ap;
1543 struct ahci_port_priv *pp = ap->private_data;
1544 int is_atapi = ata_is_atapi(qc->tf.protocol);
1545 void *cmd_tbl;
1546 u32 opts;
1547 const u32 cmd_fis_len = 5; /* five dwords */
1548 unsigned int n_elem;
1549
1550 /*
1551 * Fill in command table information. First, the header,
1552 * a SATA Register - Host to Device command FIS.
1553 */
1554 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1555
1556 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1557 if (is_atapi) {
1558 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1559 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1560 }
1561
1562 n_elem = 0;
1563 if (qc->flags & ATA_QCFLAG_DMAMAP)
1564 n_elem = ahci_fill_sg(qc, cmd_tbl);
1565
1566 /*
1567 * Fill in command slot information.
1568 */
1569 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1570 if (qc->tf.flags & ATA_TFLAG_WRITE)
1571 opts |= AHCI_CMD_WRITE;
1572 if (is_atapi)
1573 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1574
1575 ahci_fill_cmd_slot(pp, qc->tag, opts);
1576 }
1577
1578 static void ahci_fbs_dec_intr(struct ata_port *ap)
1579 {
1580 struct ahci_port_priv *pp = ap->private_data;
1581 void __iomem *port_mmio = ahci_port_base(ap);
1582 u32 fbs = readl(port_mmio + PORT_FBS);
1583 int retries = 3;
1584
1585 DPRINTK("ENTER\n");
1586 BUG_ON(!pp->fbs_enabled);
1587
1588 /* time to wait for DEC is not specified by AHCI spec,
1589 * add a retry loop for safety.
1590 */
1591 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1592 fbs = readl(port_mmio + PORT_FBS);
1593 while ((fbs & PORT_FBS_DEC) && retries--) {
1594 udelay(1);
1595 fbs = readl(port_mmio + PORT_FBS);
1596 }
1597
1598 if (fbs & PORT_FBS_DEC)
1599 dev_err(ap->host->dev, "failed to clear device error\n");
1600 }
1601
1602 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1603 {
1604 struct ahci_host_priv *hpriv = ap->host->private_data;
1605 struct ahci_port_priv *pp = ap->private_data;
1606 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1607 struct ata_link *link = NULL;
1608 struct ata_queued_cmd *active_qc;
1609 struct ata_eh_info *active_ehi;
1610 bool fbs_need_dec = false;
1611 u32 serror;
1612
1613 /* determine active link with error */
1614 if (pp->fbs_enabled) {
1615 void __iomem *port_mmio = ahci_port_base(ap);
1616 u32 fbs = readl(port_mmio + PORT_FBS);
1617 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1618
1619 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
1620 link = &ap->pmp_link[pmp];
1621 fbs_need_dec = true;
1622 }
1623
1624 } else
1625 ata_for_each_link(link, ap, EDGE)
1626 if (ata_link_active(link))
1627 break;
1628
1629 if (!link)
1630 link = &ap->link;
1631
1632 active_qc = ata_qc_from_tag(ap, link->active_tag);
1633 active_ehi = &link->eh_info;
1634
1635 /* record irq stat */
1636 ata_ehi_clear_desc(host_ehi);
1637 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1638
1639 /* AHCI needs SError cleared; otherwise, it might lock up */
1640 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1641 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1642 host_ehi->serror |= serror;
1643
1644 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1645 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1646 irq_stat &= ~PORT_IRQ_IF_ERR;
1647
1648 if (irq_stat & PORT_IRQ_TF_ERR) {
1649 /* If qc is active, charge it; otherwise, the active
1650 * link. There's no active qc on NCQ errors. It will
1651 * be determined by EH by reading log page 10h.
1652 */
1653 if (active_qc)
1654 active_qc->err_mask |= AC_ERR_DEV;
1655 else
1656 active_ehi->err_mask |= AC_ERR_DEV;
1657
1658 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1659 host_ehi->serror &= ~SERR_INTERNAL;
1660 }
1661
1662 if (irq_stat & PORT_IRQ_UNK_FIS) {
1663 u32 *unk = pp->rx_fis + RX_FIS_UNK;
1664
1665 active_ehi->err_mask |= AC_ERR_HSM;
1666 active_ehi->action |= ATA_EH_RESET;
1667 ata_ehi_push_desc(active_ehi,
1668 "unknown FIS %08x %08x %08x %08x" ,
1669 unk[0], unk[1], unk[2], unk[3]);
1670 }
1671
1672 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1673 active_ehi->err_mask |= AC_ERR_HSM;
1674 active_ehi->action |= ATA_EH_RESET;
1675 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1676 }
1677
1678 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1679 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1680 host_ehi->action |= ATA_EH_RESET;
1681 ata_ehi_push_desc(host_ehi, "host bus error");
1682 }
1683
1684 if (irq_stat & PORT_IRQ_IF_ERR) {
1685 if (fbs_need_dec)
1686 active_ehi->err_mask |= AC_ERR_DEV;
1687 else {
1688 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1689 host_ehi->action |= ATA_EH_RESET;
1690 }
1691
1692 ata_ehi_push_desc(host_ehi, "interface fatal error");
1693 }
1694
1695 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1696 ata_ehi_hotplugged(host_ehi);
1697 ata_ehi_push_desc(host_ehi, "%s",
1698 irq_stat & PORT_IRQ_CONNECT ?
1699 "connection status changed" : "PHY RDY changed");
1700 }
1701
1702 /* okay, let's hand over to EH */
1703
1704 if (irq_stat & PORT_IRQ_FREEZE)
1705 ata_port_freeze(ap);
1706 else if (fbs_need_dec) {
1707 ata_link_abort(link);
1708 ahci_fbs_dec_intr(ap);
1709 } else
1710 ata_port_abort(ap);
1711 }
1712
1713 static void ahci_handle_port_interrupt(struct ata_port *ap,
1714 void __iomem *port_mmio, u32 status)
1715 {
1716 struct ata_eh_info *ehi = &ap->link.eh_info;
1717 struct ahci_port_priv *pp = ap->private_data;
1718 struct ahci_host_priv *hpriv = ap->host->private_data;
1719 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1720 u32 qc_active = 0;
1721 int rc;
1722
1723 /* ignore BAD_PMP while resetting */
1724 if (unlikely(resetting))
1725 status &= ~PORT_IRQ_BAD_PMP;
1726
1727 if (sata_lpm_ignore_phy_events(&ap->link)) {
1728 status &= ~PORT_IRQ_PHYRDY;
1729 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1730 }
1731
1732 if (unlikely(status & PORT_IRQ_ERROR)) {
1733 ahci_error_intr(ap, status);
1734 return;
1735 }
1736
1737 if (status & PORT_IRQ_SDB_FIS) {
1738 /* If SNotification is available, leave notification
1739 * handling to sata_async_notification(). If not,
1740 * emulate it by snooping SDB FIS RX area.
1741 *
1742 * Snooping FIS RX area is probably cheaper than
1743 * poking SNotification but some constrollers which
1744 * implement SNotification, ICH9 for example, don't
1745 * store AN SDB FIS into receive area.
1746 */
1747 if (hpriv->cap & HOST_CAP_SNTF)
1748 sata_async_notification(ap);
1749 else {
1750 /* If the 'N' bit in word 0 of the FIS is set,
1751 * we just received asynchronous notification.
1752 * Tell libata about it.
1753 *
1754 * Lack of SNotification should not appear in
1755 * ahci 1.2, so the workaround is unnecessary
1756 * when FBS is enabled.
1757 */
1758 if (pp->fbs_enabled)
1759 WARN_ON_ONCE(1);
1760 else {
1761 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1762 u32 f0 = le32_to_cpu(f[0]);
1763 if (f0 & (1 << 15))
1764 sata_async_notification(ap);
1765 }
1766 }
1767 }
1768
1769 /* pp->active_link is not reliable once FBS is enabled, both
1770 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1771 * NCQ and non-NCQ commands may be in flight at the same time.
1772 */
1773 if (pp->fbs_enabled) {
1774 if (ap->qc_active) {
1775 qc_active = readl(port_mmio + PORT_SCR_ACT);
1776 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1777 }
1778 } else {
1779 /* pp->active_link is valid iff any command is in flight */
1780 if (ap->qc_active && pp->active_link->sactive)
1781 qc_active = readl(port_mmio + PORT_SCR_ACT);
1782 else
1783 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1784 }
1785
1786
1787 rc = ata_qc_complete_multiple(ap, qc_active);
1788
1789 /* while resetting, invalid completions are expected */
1790 if (unlikely(rc < 0 && !resetting)) {
1791 ehi->err_mask |= AC_ERR_HSM;
1792 ehi->action |= ATA_EH_RESET;
1793 ata_port_freeze(ap);
1794 }
1795 }
1796
1797 static void ahci_port_intr(struct ata_port *ap)
1798 {
1799 void __iomem *port_mmio = ahci_port_base(ap);
1800 u32 status;
1801
1802 status = readl(port_mmio + PORT_IRQ_STAT);
1803 writel(status, port_mmio + PORT_IRQ_STAT);
1804
1805 ahci_handle_port_interrupt(ap, port_mmio, status);
1806 }
1807
1808 static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
1809 {
1810 struct ata_port *ap = dev_instance;
1811 void __iomem *port_mmio = ahci_port_base(ap);
1812 u32 status;
1813
1814 VPRINTK("ENTER\n");
1815
1816 status = readl(port_mmio + PORT_IRQ_STAT);
1817 writel(status, port_mmio + PORT_IRQ_STAT);
1818
1819 spin_lock(ap->lock);
1820 ahci_handle_port_interrupt(ap, port_mmio, status);
1821 spin_unlock(ap->lock);
1822
1823 VPRINTK("EXIT\n");
1824
1825 return IRQ_HANDLED;
1826 }
1827
1828 static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
1829 {
1830 unsigned int i, handled = 0;
1831
1832 for (i = 0; i < host->n_ports; i++) {
1833 struct ata_port *ap;
1834
1835 if (!(irq_masked & (1 << i)))
1836 continue;
1837
1838 ap = host->ports[i];
1839 if (ap) {
1840 ahci_port_intr(ap);
1841 VPRINTK("port %u\n", i);
1842 } else {
1843 VPRINTK("port %u (no irq)\n", i);
1844 if (ata_ratelimit())
1845 dev_warn(host->dev,
1846 "interrupt on disabled port %u\n", i);
1847 }
1848
1849 handled = 1;
1850 }
1851
1852 return handled;
1853 }
1854
1855 static irqreturn_t ahci_single_edge_irq_intr(int irq, void *dev_instance)
1856 {
1857 struct ata_host *host = dev_instance;
1858 struct ahci_host_priv *hpriv;
1859 unsigned int rc = 0;
1860 void __iomem *mmio;
1861 u32 irq_stat, irq_masked;
1862
1863 VPRINTK("ENTER\n");
1864
1865 hpriv = host->private_data;
1866 mmio = hpriv->mmio;
1867
1868 /* sigh. 0xffffffff is a valid return from h/w */
1869 irq_stat = readl(mmio + HOST_IRQ_STAT);
1870 if (!irq_stat)
1871 return IRQ_NONE;
1872
1873 irq_masked = irq_stat & hpriv->port_map;
1874
1875 spin_lock(&host->lock);
1876
1877 /*
1878 * HOST_IRQ_STAT behaves as edge triggered latch meaning that
1879 * it should be cleared before all the port events are cleared.
1880 */
1881 writel(irq_stat, mmio + HOST_IRQ_STAT);
1882
1883 rc = ahci_handle_port_intr(host, irq_masked);
1884
1885 spin_unlock(&host->lock);
1886
1887 VPRINTK("EXIT\n");
1888
1889 return IRQ_RETVAL(rc);
1890 }
1891
1892 static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
1893 {
1894 struct ata_host *host = dev_instance;
1895 struct ahci_host_priv *hpriv;
1896 unsigned int rc = 0;
1897 void __iomem *mmio;
1898 u32 irq_stat, irq_masked;
1899
1900 VPRINTK("ENTER\n");
1901
1902 hpriv = host->private_data;
1903 mmio = hpriv->mmio;
1904
1905 /* sigh. 0xffffffff is a valid return from h/w */
1906 irq_stat = readl(mmio + HOST_IRQ_STAT);
1907 if (!irq_stat)
1908 return IRQ_NONE;
1909
1910 irq_masked = irq_stat & hpriv->port_map;
1911
1912 spin_lock(&host->lock);
1913
1914 rc = ahci_handle_port_intr(host, irq_masked);
1915
1916 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1917 * it should be cleared after all the port events are cleared;
1918 * otherwise, it will raise a spurious interrupt after each
1919 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1920 * information.
1921 *
1922 * Also, use the unmasked value to clear interrupt as spurious
1923 * pending event on a dummy port might cause screaming IRQ.
1924 */
1925 writel(irq_stat, mmio + HOST_IRQ_STAT);
1926
1927 spin_unlock(&host->lock);
1928
1929 VPRINTK("EXIT\n");
1930
1931 return IRQ_RETVAL(rc);
1932 }
1933
1934 unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1935 {
1936 struct ata_port *ap = qc->ap;
1937 void __iomem *port_mmio = ahci_port_base(ap);
1938 struct ahci_port_priv *pp = ap->private_data;
1939
1940 /* Keep track of the currently active link. It will be used
1941 * in completion path to determine whether NCQ phase is in
1942 * progress.
1943 */
1944 pp->active_link = qc->dev->link;
1945
1946 if (qc->tf.protocol == ATA_PROT_NCQ)
1947 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1948
1949 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1950 u32 fbs = readl(port_mmio + PORT_FBS);
1951 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1952 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1953 writel(fbs, port_mmio + PORT_FBS);
1954 pp->fbs_last_dev = qc->dev->link->pmp;
1955 }
1956
1957 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1958
1959 ahci_sw_activity(qc->dev->link);
1960
1961 return 0;
1962 }
1963 EXPORT_SYMBOL_GPL(ahci_qc_issue);
1964
1965 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1966 {
1967 struct ahci_port_priv *pp = qc->ap->private_data;
1968 u8 *rx_fis = pp->rx_fis;
1969
1970 if (pp->fbs_enabled)
1971 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1972
1973 /*
1974 * After a successful execution of an ATA PIO data-in command,
1975 * the device doesn't send D2H Reg FIS to update the TF and
1976 * the host should take TF and E_Status from the preceding PIO
1977 * Setup FIS.
1978 */
1979 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1980 !(qc->flags & ATA_QCFLAG_FAILED)) {
1981 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1982 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1983 } else
1984 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1985
1986 return true;
1987 }
1988
1989 static void ahci_freeze(struct ata_port *ap)
1990 {
1991 void __iomem *port_mmio = ahci_port_base(ap);
1992
1993 /* turn IRQ off */
1994 writel(0, port_mmio + PORT_IRQ_MASK);
1995 }
1996
1997 static void ahci_thaw(struct ata_port *ap)
1998 {
1999 struct ahci_host_priv *hpriv = ap->host->private_data;
2000 void __iomem *mmio = hpriv->mmio;
2001 void __iomem *port_mmio = ahci_port_base(ap);
2002 u32 tmp;
2003 struct ahci_port_priv *pp = ap->private_data;
2004
2005 /* clear IRQ */
2006 tmp = readl(port_mmio + PORT_IRQ_STAT);
2007 writel(tmp, port_mmio + PORT_IRQ_STAT);
2008 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
2009
2010 /* turn IRQ back on */
2011 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2012 }
2013
2014 void ahci_error_handler(struct ata_port *ap)
2015 {
2016 struct ahci_host_priv *hpriv = ap->host->private_data;
2017
2018 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
2019 /* restart engine */
2020 ahci_stop_engine(ap);
2021 hpriv->start_engine(ap);
2022 }
2023
2024 sata_pmp_error_handler(ap);
2025
2026 if (!ata_dev_enabled(ap->link.device))
2027 ahci_stop_engine(ap);
2028 }
2029 EXPORT_SYMBOL_GPL(ahci_error_handler);
2030
2031 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
2032 {
2033 struct ata_port *ap = qc->ap;
2034
2035 /* make DMA engine forget about the failed command */
2036 if (qc->flags & ATA_QCFLAG_FAILED)
2037 ahci_kick_engine(ap);
2038 }
2039
2040 static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2041 {
2042 struct ahci_host_priv *hpriv = ap->host->private_data;
2043 void __iomem *port_mmio = ahci_port_base(ap);
2044 struct ata_device *dev = ap->link.device;
2045 u32 devslp, dm, dito, mdat, deto;
2046 int rc;
2047 unsigned int err_mask;
2048
2049 devslp = readl(port_mmio + PORT_DEVSLP);
2050 if (!(devslp & PORT_DEVSLP_DSP)) {
2051 dev_info(ap->host->dev, "port does not support device sleep\n");
2052 return;
2053 }
2054
2055 /* disable device sleep */
2056 if (!sleep) {
2057 if (devslp & PORT_DEVSLP_ADSE) {
2058 writel(devslp & ~PORT_DEVSLP_ADSE,
2059 port_mmio + PORT_DEVSLP);
2060 err_mask = ata_dev_set_feature(dev,
2061 SETFEATURES_SATA_DISABLE,
2062 SATA_DEVSLP);
2063 if (err_mask && err_mask != AC_ERR_DEV)
2064 ata_dev_warn(dev, "failed to disable DEVSLP\n");
2065 }
2066 return;
2067 }
2068
2069 /* device sleep was already enabled */
2070 if (devslp & PORT_DEVSLP_ADSE)
2071 return;
2072
2073 /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2074 rc = ahci_stop_engine(ap);
2075 if (rc)
2076 return;
2077
2078 dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2079 dito = devslp_idle_timeout / (dm + 1);
2080 if (dito > 0x3ff)
2081 dito = 0x3ff;
2082
2083 /* Use the nominal value 10 ms if the read MDAT is zero,
2084 * the nominal value of DETO is 20 ms.
2085 */
2086 if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2087 ATA_LOG_DEVSLP_VALID_MASK) {
2088 mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2089 ATA_LOG_DEVSLP_MDAT_MASK;
2090 if (!mdat)
2091 mdat = 10;
2092 deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2093 if (!deto)
2094 deto = 20;
2095 } else {
2096 mdat = 10;
2097 deto = 20;
2098 }
2099
2100 devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2101 (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2102 (deto << PORT_DEVSLP_DETO_OFFSET) |
2103 PORT_DEVSLP_ADSE);
2104 writel(devslp, port_mmio + PORT_DEVSLP);
2105
2106 hpriv->start_engine(ap);
2107
2108 /* enable device sleep feature for the drive */
2109 err_mask = ata_dev_set_feature(dev,
2110 SETFEATURES_SATA_ENABLE,
2111 SATA_DEVSLP);
2112 if (err_mask && err_mask != AC_ERR_DEV)
2113 ata_dev_warn(dev, "failed to enable DEVSLP\n");
2114 }
2115
2116 static void ahci_enable_fbs(struct ata_port *ap)
2117 {
2118 struct ahci_host_priv *hpriv = ap->host->private_data;
2119 struct ahci_port_priv *pp = ap->private_data;
2120 void __iomem *port_mmio = ahci_port_base(ap);
2121 u32 fbs;
2122 int rc;
2123
2124 if (!pp->fbs_supported)
2125 return;
2126
2127 fbs = readl(port_mmio + PORT_FBS);
2128 if (fbs & PORT_FBS_EN) {
2129 pp->fbs_enabled = true;
2130 pp->fbs_last_dev = -1; /* initialization */
2131 return;
2132 }
2133
2134 rc = ahci_stop_engine(ap);
2135 if (rc)
2136 return;
2137
2138 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2139 fbs = readl(port_mmio + PORT_FBS);
2140 if (fbs & PORT_FBS_EN) {
2141 dev_info(ap->host->dev, "FBS is enabled\n");
2142 pp->fbs_enabled = true;
2143 pp->fbs_last_dev = -1; /* initialization */
2144 } else
2145 dev_err(ap->host->dev, "Failed to enable FBS\n");
2146
2147 hpriv->start_engine(ap);
2148 }
2149
2150 static void ahci_disable_fbs(struct ata_port *ap)
2151 {
2152 struct ahci_host_priv *hpriv = ap->host->private_data;
2153 struct ahci_port_priv *pp = ap->private_data;
2154 void __iomem *port_mmio = ahci_port_base(ap);
2155 u32 fbs;
2156 int rc;
2157
2158 if (!pp->fbs_supported)
2159 return;
2160
2161 fbs = readl(port_mmio + PORT_FBS);
2162 if ((fbs & PORT_FBS_EN) == 0) {
2163 pp->fbs_enabled = false;
2164 return;
2165 }
2166
2167 rc = ahci_stop_engine(ap);
2168 if (rc)
2169 return;
2170
2171 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2172 fbs = readl(port_mmio + PORT_FBS);
2173 if (fbs & PORT_FBS_EN)
2174 dev_err(ap->host->dev, "Failed to disable FBS\n");
2175 else {
2176 dev_info(ap->host->dev, "FBS is disabled\n");
2177 pp->fbs_enabled = false;
2178 }
2179
2180 hpriv->start_engine(ap);
2181 }
2182
2183 static void ahci_pmp_attach(struct ata_port *ap)
2184 {
2185 void __iomem *port_mmio = ahci_port_base(ap);
2186 struct ahci_port_priv *pp = ap->private_data;
2187 u32 cmd;
2188
2189 cmd = readl(port_mmio + PORT_CMD);
2190 cmd |= PORT_CMD_PMP;
2191 writel(cmd, port_mmio + PORT_CMD);
2192
2193 ahci_enable_fbs(ap);
2194
2195 pp->intr_mask |= PORT_IRQ_BAD_PMP;
2196
2197 /*
2198 * We must not change the port interrupt mask register if the
2199 * port is marked frozen, the value in pp->intr_mask will be
2200 * restored later when the port is thawed.
2201 *
2202 * Note that during initialization, the port is marked as
2203 * frozen since the irq handler is not yet registered.
2204 */
2205 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2206 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2207 }
2208
2209 static void ahci_pmp_detach(struct ata_port *ap)
2210 {
2211 void __iomem *port_mmio = ahci_port_base(ap);
2212 struct ahci_port_priv *pp = ap->private_data;
2213 u32 cmd;
2214
2215 ahci_disable_fbs(ap);
2216
2217 cmd = readl(port_mmio + PORT_CMD);
2218 cmd &= ~PORT_CMD_PMP;
2219 writel(cmd, port_mmio + PORT_CMD);
2220
2221 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2222
2223 /* see comment above in ahci_pmp_attach() */
2224 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2225 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2226 }
2227
2228 int ahci_port_resume(struct ata_port *ap)
2229 {
2230 ahci_power_up(ap);
2231 ahci_start_port(ap);
2232
2233 if (sata_pmp_attached(ap))
2234 ahci_pmp_attach(ap);
2235 else
2236 ahci_pmp_detach(ap);
2237
2238 return 0;
2239 }
2240 EXPORT_SYMBOL_GPL(ahci_port_resume);
2241
2242 #ifdef CONFIG_PM
2243 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2244 {
2245 const char *emsg = NULL;
2246 int rc;
2247
2248 rc = ahci_deinit_port(ap, &emsg);
2249 if (rc == 0)
2250 ahci_power_down(ap);
2251 else {
2252 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2253 ata_port_freeze(ap);
2254 }
2255
2256 return rc;
2257 }
2258 #endif
2259
2260 static int ahci_port_start(struct ata_port *ap)
2261 {
2262 struct ahci_host_priv *hpriv = ap->host->private_data;
2263 struct device *dev = ap->host->dev;
2264 struct ahci_port_priv *pp;
2265 void *mem;
2266 dma_addr_t mem_dma;
2267 size_t dma_sz, rx_fis_sz;
2268
2269 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2270 if (!pp)
2271 return -ENOMEM;
2272
2273 if (ap->host->n_ports > 1) {
2274 pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
2275 if (!pp->irq_desc) {
2276 devm_kfree(dev, pp);
2277 return -ENOMEM;
2278 }
2279 snprintf(pp->irq_desc, 8,
2280 "%s%d", dev_driver_string(dev), ap->port_no);
2281 }
2282
2283 /* check FBS capability */
2284 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2285 void __iomem *port_mmio = ahci_port_base(ap);
2286 u32 cmd = readl(port_mmio + PORT_CMD);
2287 if (cmd & PORT_CMD_FBSCP)
2288 pp->fbs_supported = true;
2289 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2290 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2291 ap->port_no);
2292 pp->fbs_supported = true;
2293 } else
2294 dev_warn(dev, "port %d is not capable of FBS\n",
2295 ap->port_no);
2296 }
2297
2298 if (pp->fbs_supported) {
2299 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2300 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2301 } else {
2302 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2303 rx_fis_sz = AHCI_RX_FIS_SZ;
2304 }
2305
2306 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2307 if (!mem)
2308 return -ENOMEM;
2309 memset(mem, 0, dma_sz);
2310
2311 /*
2312 * First item in chunk of DMA memory: 32-slot command table,
2313 * 32 bytes each in size
2314 */
2315 pp->cmd_slot = mem;
2316 pp->cmd_slot_dma = mem_dma;
2317
2318 mem += AHCI_CMD_SLOT_SZ;
2319 mem_dma += AHCI_CMD_SLOT_SZ;
2320
2321 /*
2322 * Second item: Received-FIS area
2323 */
2324 pp->rx_fis = mem;
2325 pp->rx_fis_dma = mem_dma;
2326
2327 mem += rx_fis_sz;
2328 mem_dma += rx_fis_sz;
2329
2330 /*
2331 * Third item: data area for storing a single command
2332 * and its scatter-gather table
2333 */
2334 pp->cmd_tbl = mem;
2335 pp->cmd_tbl_dma = mem_dma;
2336
2337 /*
2338 * Save off initial list of interrupts to be enabled.
2339 * This could be changed later
2340 */
2341 pp->intr_mask = DEF_PORT_IRQ;
2342
2343 /*
2344 * Switch to per-port locking in case each port has its own MSI vector.
2345 */
2346 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2347 spin_lock_init(&pp->lock);
2348 ap->lock = &pp->lock;
2349 }
2350
2351 ap->private_data = pp;
2352
2353 /* engage engines, captain */
2354 return ahci_port_resume(ap);
2355 }
2356
2357 static void ahci_port_stop(struct ata_port *ap)
2358 {
2359 const char *emsg = NULL;
2360 int rc;
2361
2362 /* de-initialize port */
2363 rc = ahci_deinit_port(ap, &emsg);
2364 if (rc)
2365 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2366 }
2367
2368 void ahci_print_info(struct ata_host *host, const char *scc_s)
2369 {
2370 struct ahci_host_priv *hpriv = host->private_data;
2371 void __iomem *mmio = hpriv->mmio;
2372 u32 vers, cap, cap2, impl, speed;
2373 const char *speed_s;
2374
2375 vers = readl(mmio + HOST_VERSION);
2376 cap = hpriv->cap;
2377 cap2 = hpriv->cap2;
2378 impl = hpriv->port_map;
2379
2380 speed = (cap >> 20) & 0xf;
2381 if (speed == 1)
2382 speed_s = "1.5";
2383 else if (speed == 2)
2384 speed_s = "3";
2385 else if (speed == 3)
2386 speed_s = "6";
2387 else
2388 speed_s = "?";
2389
2390 dev_info(host->dev,
2391 "AHCI %02x%02x.%02x%02x "
2392 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2393 ,
2394
2395 (vers >> 24) & 0xff,
2396 (vers >> 16) & 0xff,
2397 (vers >> 8) & 0xff,
2398 vers & 0xff,
2399
2400 ((cap >> 8) & 0x1f) + 1,
2401 (cap & 0x1f) + 1,
2402 speed_s,
2403 impl,
2404 scc_s);
2405
2406 dev_info(host->dev,
2407 "flags: "
2408 "%s%s%s%s%s%s%s"
2409 "%s%s%s%s%s%s%s"
2410 "%s%s%s%s%s%s%s"
2411 "%s%s\n"
2412 ,
2413
2414 cap & HOST_CAP_64 ? "64bit " : "",
2415 cap & HOST_CAP_NCQ ? "ncq " : "",
2416 cap & HOST_CAP_SNTF ? "sntf " : "",
2417 cap & HOST_CAP_MPS ? "ilck " : "",
2418 cap & HOST_CAP_SSS ? "stag " : "",
2419 cap & HOST_CAP_ALPM ? "pm " : "",
2420 cap & HOST_CAP_LED ? "led " : "",
2421 cap & HOST_CAP_CLO ? "clo " : "",
2422 cap & HOST_CAP_ONLY ? "only " : "",
2423 cap & HOST_CAP_PMP ? "pmp " : "",
2424 cap & HOST_CAP_FBS ? "fbs " : "",
2425 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2426 cap & HOST_CAP_SSC ? "slum " : "",
2427 cap & HOST_CAP_PART ? "part " : "",
2428 cap & HOST_CAP_CCC ? "ccc " : "",
2429 cap & HOST_CAP_EMS ? "ems " : "",
2430 cap & HOST_CAP_SXS ? "sxs " : "",
2431 cap2 & HOST_CAP2_DESO ? "deso " : "",
2432 cap2 & HOST_CAP2_SADM ? "sadm " : "",
2433 cap2 & HOST_CAP2_SDS ? "sds " : "",
2434 cap2 & HOST_CAP2_APST ? "apst " : "",
2435 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2436 cap2 & HOST_CAP2_BOH ? "boh " : ""
2437 );
2438 }
2439 EXPORT_SYMBOL_GPL(ahci_print_info);
2440
2441 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2442 struct ata_port_info *pi)
2443 {
2444 u8 messages;
2445 void __iomem *mmio = hpriv->mmio;
2446 u32 em_loc = readl(mmio + HOST_EM_LOC);
2447 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2448
2449 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2450 return;
2451
2452 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2453
2454 if (messages) {
2455 /* store em_loc */
2456 hpriv->em_loc = ((em_loc >> 16) * 4);
2457 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2458 hpriv->em_msg_type = messages;
2459 pi->flags |= ATA_FLAG_EM;
2460 if (!(em_ctl & EM_CTL_ALHD))
2461 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2462 }
2463 }
2464 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2465
2466 static int ahci_host_activate_multi_irqs(struct ata_host *host,
2467 struct scsi_host_template *sht)
2468 {
2469 struct ahci_host_priv *hpriv = host->private_data;
2470 int i, rc;
2471
2472 rc = ata_host_start(host);
2473 if (rc)
2474 return rc;
2475 /*
2476 * Requests IRQs according to AHCI-1.1 when multiple MSIs were
2477 * allocated. That is one MSI per port, starting from @irq.
2478 */
2479 for (i = 0; i < host->n_ports; i++) {
2480 struct ahci_port_priv *pp = host->ports[i]->private_data;
2481 int irq = ahci_irq_vector(hpriv, i);
2482
2483 /* Do not receive interrupts sent by dummy ports */
2484 if (!pp) {
2485 disable_irq(irq + i);
2486 continue;
2487 }
2488
2489 rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
2490 0, pp->irq_desc, host->ports[i]);
2491
2492 if (rc)
2493 return rc;
2494 ata_port_desc(host->ports[i], "irq %d", irq);
2495 }
2496
2497 return ata_host_register(host, sht);
2498 }
2499
2500 /**
2501 * ahci_host_activate - start AHCI host, request IRQs and register it
2502 * @host: target ATA host
2503 * @sht: scsi_host_template to use when registering the host
2504 *
2505 * LOCKING:
2506 * Inherited from calling layer (may sleep).
2507 *
2508 * RETURNS:
2509 * 0 on success, -errno otherwise.
2510 */
2511 int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
2512 {
2513 struct ahci_host_priv *hpriv = host->private_data;
2514 int irq = hpriv->irq;
2515 int rc;
2516
2517 if (hpriv->flags & (AHCI_HFLAG_MULTI_MSI | AHCI_HFLAG_MULTI_MSIX))
2518 rc = ahci_host_activate_multi_irqs(host, sht);
2519 else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ)
2520 rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr,
2521 IRQF_SHARED, sht);
2522 else
2523 rc = ata_host_activate(host, irq, ahci_single_level_irq_intr,
2524 IRQF_SHARED, sht);
2525 return rc;
2526 }
2527 EXPORT_SYMBOL_GPL(ahci_host_activate);
2528
2529 MODULE_AUTHOR("Jeff Garzik");
2530 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2531 MODULE_LICENSE("GPL");
(deprecated) Btrfs devel tree