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brd: remove dax support
[linux-2.6/btrfs-unstable.git] / drivers / ata / libahci.c
blob3e286d86ab42acbc54c84488e74ffc37f13dff65
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/driver-api/libata.rst
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 static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance);
117
118 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
119 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
120 static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
121 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
122 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
123 ahci_read_em_buffer, ahci_store_em_buffer);
124 static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
125
126 struct device_attribute *ahci_shost_attrs[] = {
127 &dev_attr_link_power_management_policy,
128 &dev_attr_em_message_type,
129 &dev_attr_em_message,
130 &dev_attr_ahci_host_caps,
131 &dev_attr_ahci_host_cap2,
132 &dev_attr_ahci_host_version,
133 &dev_attr_ahci_port_cmd,
134 &dev_attr_em_buffer,
135 &dev_attr_em_message_supported,
136 NULL
137 };
138 EXPORT_SYMBOL_GPL(ahci_shost_attrs);
139
140 struct device_attribute *ahci_sdev_attrs[] = {
141 &dev_attr_sw_activity,
142 &dev_attr_unload_heads,
143 &dev_attr_ncq_prio_enable,
144 NULL
145 };
146 EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
147
148 struct ata_port_operations ahci_ops = {
149 .inherits = &sata_pmp_port_ops,
150
151 .qc_defer = ahci_pmp_qc_defer,
152 .qc_prep = ahci_qc_prep,
153 .qc_issue = ahci_qc_issue,
154 .qc_fill_rtf = ahci_qc_fill_rtf,
155
156 .freeze = ahci_freeze,
157 .thaw = ahci_thaw,
158 .softreset = ahci_softreset,
159 .hardreset = ahci_hardreset,
160 .postreset = ahci_postreset,
161 .pmp_softreset = ahci_softreset,
162 .error_handler = ahci_error_handler,
163 .post_internal_cmd = ahci_post_internal_cmd,
164 .dev_config = ahci_dev_config,
165
166 .scr_read = ahci_scr_read,
167 .scr_write = ahci_scr_write,
168 .pmp_attach = ahci_pmp_attach,
169 .pmp_detach = ahci_pmp_detach,
170
171 .set_lpm = ahci_set_lpm,
172 .em_show = ahci_led_show,
173 .em_store = ahci_led_store,
174 .sw_activity_show = ahci_activity_show,
175 .sw_activity_store = ahci_activity_store,
176 .transmit_led_message = ahci_transmit_led_message,
177 #ifdef CONFIG_PM
178 .port_suspend = ahci_port_suspend,
179 .port_resume = ahci_port_resume,
180 #endif
181 .port_start = ahci_port_start,
182 .port_stop = ahci_port_stop,
183 };
184 EXPORT_SYMBOL_GPL(ahci_ops);
185
186 struct ata_port_operations ahci_pmp_retry_srst_ops = {
187 .inherits = &ahci_ops,
188 .softreset = ahci_pmp_retry_softreset,
189 };
190 EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
191
192 static bool ahci_em_messages __read_mostly = true;
193 EXPORT_SYMBOL_GPL(ahci_em_messages);
194 module_param(ahci_em_messages, bool, 0444);
195 /* add other LED protocol types when they become supported */
196 MODULE_PARM_DESC(ahci_em_messages,
197 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
198
199 /* device sleep idle timeout in ms */
200 static int devslp_idle_timeout __read_mostly = 1000;
201 module_param(devslp_idle_timeout, int, 0644);
202 MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
203
204 static void ahci_enable_ahci(void __iomem *mmio)
205 {
206 int i;
207 u32 tmp;
208
209 /* turn on AHCI_EN */
210 tmp = readl(mmio + HOST_CTL);
211 if (tmp & HOST_AHCI_EN)
212 return;
213
214 /* Some controllers need AHCI_EN to be written multiple times.
215 * Try a few times before giving up.
216 */
217 for (i = 0; i < 5; i++) {
218 tmp |= HOST_AHCI_EN;
219 writel(tmp, mmio + HOST_CTL);
220 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
221 if (tmp & HOST_AHCI_EN)
222 return;
223 msleep(10);
224 }
225
226 WARN_ON(1);
227 }
228
229 /**
230 * ahci_rpm_get_port - Make sure the port is powered on
231 * @ap: Port to power on
232 *
233 * Whenever there is need to access the AHCI host registers outside of
234 * normal execution paths, call this function to make sure the host is
235 * actually powered on.
236 */
237 static int ahci_rpm_get_port(struct ata_port *ap)
238 {
239 return pm_runtime_get_sync(ap->dev);
240 }
241
242 /**
243 * ahci_rpm_put_port - Undoes ahci_rpm_get_port()
244 * @ap: Port to power down
245 *
246 * Undoes ahci_rpm_get_port() and possibly powers down the AHCI host
247 * if it has no more active users.
248 */
249 static void ahci_rpm_put_port(struct ata_port *ap)
250 {
251 pm_runtime_put(ap->dev);
252 }
253
254 static ssize_t ahci_show_host_caps(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
261 return sprintf(buf, "%x\n", hpriv->cap);
262 }
263
264 static ssize_t ahci_show_host_cap2(struct device *dev,
265 struct device_attribute *attr, char *buf)
266 {
267 struct Scsi_Host *shost = class_to_shost(dev);
268 struct ata_port *ap = ata_shost_to_port(shost);
269 struct ahci_host_priv *hpriv = ap->host->private_data;
270
271 return sprintf(buf, "%x\n", hpriv->cap2);
272 }
273
274 static ssize_t ahci_show_host_version(struct device *dev,
275 struct device_attribute *attr, char *buf)
276 {
277 struct Scsi_Host *shost = class_to_shost(dev);
278 struct ata_port *ap = ata_shost_to_port(shost);
279 struct ahci_host_priv *hpriv = ap->host->private_data;
280
281 return sprintf(buf, "%x\n", hpriv->version);
282 }
283
284 static ssize_t ahci_show_port_cmd(struct device *dev,
285 struct device_attribute *attr, char *buf)
286 {
287 struct Scsi_Host *shost = class_to_shost(dev);
288 struct ata_port *ap = ata_shost_to_port(shost);
289 void __iomem *port_mmio = ahci_port_base(ap);
290 ssize_t ret;
291
292 ahci_rpm_get_port(ap);
293 ret = sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
294 ahci_rpm_put_port(ap);
295
296 return ret;
297 }
298
299 static ssize_t ahci_read_em_buffer(struct device *dev,
300 struct device_attribute *attr, char *buf)
301 {
302 struct Scsi_Host *shost = class_to_shost(dev);
303 struct ata_port *ap = ata_shost_to_port(shost);
304 struct ahci_host_priv *hpriv = ap->host->private_data;
305 void __iomem *mmio = hpriv->mmio;
306 void __iomem *em_mmio = mmio + hpriv->em_loc;
307 u32 em_ctl, msg;
308 unsigned long flags;
309 size_t count;
310 int i;
311
312 ahci_rpm_get_port(ap);
313 spin_lock_irqsave(ap->lock, flags);
314
315 em_ctl = readl(mmio + HOST_EM_CTL);
316 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
317 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
318 spin_unlock_irqrestore(ap->lock, flags);
319 ahci_rpm_put_port(ap);
320 return -EINVAL;
321 }
322
323 if (!(em_ctl & EM_CTL_MR)) {
324 spin_unlock_irqrestore(ap->lock, flags);
325 ahci_rpm_put_port(ap);
326 return -EAGAIN;
327 }
328
329 if (!(em_ctl & EM_CTL_SMB))
330 em_mmio += hpriv->em_buf_sz;
331
332 count = hpriv->em_buf_sz;
333
334 /* the count should not be larger than PAGE_SIZE */
335 if (count > PAGE_SIZE) {
336 if (printk_ratelimit())
337 ata_port_warn(ap,
338 "EM read buffer size too large: "
339 "buffer size %u, page size %lu\n",
340 hpriv->em_buf_sz, PAGE_SIZE);
341 count = PAGE_SIZE;
342 }
343
344 for (i = 0; i < count; i += 4) {
345 msg = readl(em_mmio + i);
346 buf[i] = msg & 0xff;
347 buf[i + 1] = (msg >> 8) & 0xff;
348 buf[i + 2] = (msg >> 16) & 0xff;
349 buf[i + 3] = (msg >> 24) & 0xff;
350 }
351
352 spin_unlock_irqrestore(ap->lock, flags);
353 ahci_rpm_put_port(ap);
354
355 return i;
356 }
357
358 static ssize_t ahci_store_em_buffer(struct device *dev,
359 struct device_attribute *attr,
360 const char *buf, size_t size)
361 {
362 struct Scsi_Host *shost = class_to_shost(dev);
363 struct ata_port *ap = ata_shost_to_port(shost);
364 struct ahci_host_priv *hpriv = ap->host->private_data;
365 void __iomem *mmio = hpriv->mmio;
366 void __iomem *em_mmio = mmio + hpriv->em_loc;
367 const unsigned char *msg_buf = buf;
368 u32 em_ctl, msg;
369 unsigned long flags;
370 int i;
371
372 /* check size validity */
373 if (!(ap->flags & ATA_FLAG_EM) ||
374 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
375 size % 4 || size > hpriv->em_buf_sz)
376 return -EINVAL;
377
378 ahci_rpm_get_port(ap);
379 spin_lock_irqsave(ap->lock, flags);
380
381 em_ctl = readl(mmio + HOST_EM_CTL);
382 if (em_ctl & EM_CTL_TM) {
383 spin_unlock_irqrestore(ap->lock, flags);
384 ahci_rpm_put_port(ap);
385 return -EBUSY;
386 }
387
388 for (i = 0; i < size; i += 4) {
389 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
390 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
391 writel(msg, em_mmio + i);
392 }
393
394 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
395
396 spin_unlock_irqrestore(ap->lock, flags);
397 ahci_rpm_put_port(ap);
398
399 return size;
400 }
401
402 static ssize_t ahci_show_em_supported(struct device *dev,
403 struct device_attribute *attr, char *buf)
404 {
405 struct Scsi_Host *shost = class_to_shost(dev);
406 struct ata_port *ap = ata_shost_to_port(shost);
407 struct ahci_host_priv *hpriv = ap->host->private_data;
408 void __iomem *mmio = hpriv->mmio;
409 u32 em_ctl;
410
411 ahci_rpm_get_port(ap);
412 em_ctl = readl(mmio + HOST_EM_CTL);
413 ahci_rpm_put_port(ap);
414
415 return sprintf(buf, "%s%s%s%s\n",
416 em_ctl & EM_CTL_LED ? "led " : "",
417 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
418 em_ctl & EM_CTL_SES ? "ses-2 " : "",
419 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
420 }
421
422 /**
423 * ahci_save_initial_config - Save and fixup initial config values
424 * @dev: target AHCI device
425 * @hpriv: host private area to store config values
426 *
427 * Some registers containing configuration info might be setup by
428 * BIOS and might be cleared on reset. This function saves the
429 * initial values of those registers into @hpriv such that they
430 * can be restored after controller reset.
431 *
432 * If inconsistent, config values are fixed up by this function.
433 *
434 * If it is not set already this function sets hpriv->start_engine to
435 * ahci_start_engine.
436 *
437 * LOCKING:
438 * None.
439 */
440 void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
441 {
442 void __iomem *mmio = hpriv->mmio;
443 u32 cap, cap2, vers, port_map;
444 int i;
445
446 /* make sure AHCI mode is enabled before accessing CAP */
447 ahci_enable_ahci(mmio);
448
449 /* Values prefixed with saved_ are written back to host after
450 * reset. Values without are used for driver operation.
451 */
452 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
453 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
454
455 /* CAP2 register is only defined for AHCI 1.2 and later */
456 vers = readl(mmio + HOST_VERSION);
457 if ((vers >> 16) > 1 ||
458 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
459 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
460 else
461 hpriv->saved_cap2 = cap2 = 0;
462
463 /* some chips have errata preventing 64bit use */
464 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
465 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
466 cap &= ~HOST_CAP_64;
467 }
468
469 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
470 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
471 cap &= ~HOST_CAP_NCQ;
472 }
473
474 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
475 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
476 cap |= HOST_CAP_NCQ;
477 }
478
479 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
480 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
481 cap &= ~HOST_CAP_PMP;
482 }
483
484 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
485 dev_info(dev,
486 "controller can't do SNTF, turning off CAP_SNTF\n");
487 cap &= ~HOST_CAP_SNTF;
488 }
489
490 if ((cap2 & HOST_CAP2_SDS) && (hpriv->flags & AHCI_HFLAG_NO_DEVSLP)) {
491 dev_info(dev,
492 "controller can't do DEVSLP, turning off\n");
493 cap2 &= ~HOST_CAP2_SDS;
494 cap2 &= ~HOST_CAP2_SADM;
495 }
496
497 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
498 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
499 cap |= HOST_CAP_FBS;
500 }
501
502 if ((cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_NO_FBS)) {
503 dev_info(dev, "controller can't do FBS, turning off CAP_FBS\n");
504 cap &= ~HOST_CAP_FBS;
505 }
506
507 if (!(cap & HOST_CAP_ALPM) && (hpriv->flags & AHCI_HFLAG_YES_ALPM)) {
508 dev_info(dev, "controller can do ALPM, turning on CAP_ALPM\n");
509 cap |= HOST_CAP_ALPM;
510 }
511
512 if (hpriv->force_port_map && port_map != hpriv->force_port_map) {
513 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
514 port_map, hpriv->force_port_map);
515 port_map = hpriv->force_port_map;
516 hpriv->saved_port_map = port_map;
517 }
518
519 if (hpriv->mask_port_map) {
520 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
521 port_map,
522 port_map & hpriv->mask_port_map);
523 port_map &= hpriv->mask_port_map;
524 }
525
526 /* cross check port_map and cap.n_ports */
527 if (port_map) {
528 int map_ports = 0;
529
530 for (i = 0; i < AHCI_MAX_PORTS; i++)
531 if (port_map & (1 << i))
532 map_ports++;
533
534 /* If PI has more ports than n_ports, whine, clear
535 * port_map and let it be generated from n_ports.
536 */
537 if (map_ports > ahci_nr_ports(cap)) {
538 dev_warn(dev,
539 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
540 port_map, ahci_nr_ports(cap));
541 port_map = 0;
542 }
543 }
544
545 /* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
546 if (!port_map && vers < 0x10300) {
547 port_map = (1 << ahci_nr_ports(cap)) - 1;
548 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
549
550 /* write the fixed up value to the PI register */
551 hpriv->saved_port_map = port_map;
552 }
553
554 /* record values to use during operation */
555 hpriv->cap = cap;
556 hpriv->cap2 = cap2;
557 hpriv->version = readl(mmio + HOST_VERSION);
558 hpriv->port_map = port_map;
559
560 if (!hpriv->start_engine)
561 hpriv->start_engine = ahci_start_engine;
562
563 if (!hpriv->irq_handler)
564 hpriv->irq_handler = ahci_single_level_irq_intr;
565 }
566 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
567
568 /**
569 * ahci_restore_initial_config - Restore initial config
570 * @host: target ATA host
571 *
572 * Restore initial config stored by ahci_save_initial_config().
573 *
574 * LOCKING:
575 * None.
576 */
577 static void ahci_restore_initial_config(struct ata_host *host)
578 {
579 struct ahci_host_priv *hpriv = host->private_data;
580 void __iomem *mmio = hpriv->mmio;
581
582 writel(hpriv->saved_cap, mmio + HOST_CAP);
583 if (hpriv->saved_cap2)
584 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
585 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
586 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
587 }
588
589 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
590 {
591 static const int offset[] = {
592 [SCR_STATUS] = PORT_SCR_STAT,
593 [SCR_CONTROL] = PORT_SCR_CTL,
594 [SCR_ERROR] = PORT_SCR_ERR,
595 [SCR_ACTIVE] = PORT_SCR_ACT,
596 [SCR_NOTIFICATION] = PORT_SCR_NTF,
597 };
598 struct ahci_host_priv *hpriv = ap->host->private_data;
599
600 if (sc_reg < ARRAY_SIZE(offset) &&
601 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
602 return offset[sc_reg];
603 return 0;
604 }
605
606 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
607 {
608 void __iomem *port_mmio = ahci_port_base(link->ap);
609 int offset = ahci_scr_offset(link->ap, sc_reg);
610
611 if (offset) {
612 *val = readl(port_mmio + offset);
613 return 0;
614 }
615 return -EINVAL;
616 }
617
618 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
619 {
620 void __iomem *port_mmio = ahci_port_base(link->ap);
621 int offset = ahci_scr_offset(link->ap, sc_reg);
622
623 if (offset) {
624 writel(val, port_mmio + offset);
625 return 0;
626 }
627 return -EINVAL;
628 }
629
630 void ahci_start_engine(struct ata_port *ap)
631 {
632 void __iomem *port_mmio = ahci_port_base(ap);
633 u32 tmp;
634
635 /* start DMA */
636 tmp = readl(port_mmio + PORT_CMD);
637 tmp |= PORT_CMD_START;
638 writel(tmp, port_mmio + PORT_CMD);
639 readl(port_mmio + PORT_CMD); /* flush */
640 }
641 EXPORT_SYMBOL_GPL(ahci_start_engine);
642
643 int ahci_stop_engine(struct ata_port *ap)
644 {
645 void __iomem *port_mmio = ahci_port_base(ap);
646 struct ahci_host_priv *hpriv = ap->host->private_data;
647 u32 tmp;
648
649 /*
650 * On some controllers, stopping a port's DMA engine while the port
651 * is in ALPM state (partial or slumber) results in failures on
652 * subsequent DMA engine starts. For those controllers, put the
653 * port back in active state before stopping its DMA engine.
654 */
655 if ((hpriv->flags & AHCI_HFLAG_WAKE_BEFORE_STOP) &&
656 (ap->link.lpm_policy > ATA_LPM_MAX_POWER) &&
657 ahci_set_lpm(&ap->link, ATA_LPM_MAX_POWER, ATA_LPM_WAKE_ONLY)) {
658 dev_err(ap->host->dev, "Failed to wake up port before engine stop\n");
659 return -EIO;
660 }
661
662 tmp = readl(port_mmio + PORT_CMD);
663
664 /* check if the HBA is idle */
665 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
666 return 0;
667
668 /* setting HBA to idle */
669 tmp &= ~PORT_CMD_START;
670 writel(tmp, port_mmio + PORT_CMD);
671
672 /* wait for engine to stop. This could be as long as 500 msec */
673 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
674 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
675 if (tmp & PORT_CMD_LIST_ON)
676 return -EIO;
677
678 return 0;
679 }
680 EXPORT_SYMBOL_GPL(ahci_stop_engine);
681
682 void ahci_start_fis_rx(struct ata_port *ap)
683 {
684 void __iomem *port_mmio = ahci_port_base(ap);
685 struct ahci_host_priv *hpriv = ap->host->private_data;
686 struct ahci_port_priv *pp = ap->private_data;
687 u32 tmp;
688
689 /* set FIS registers */
690 if (hpriv->cap & HOST_CAP_64)
691 writel((pp->cmd_slot_dma >> 16) >> 16,
692 port_mmio + PORT_LST_ADDR_HI);
693 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
694
695 if (hpriv->cap & HOST_CAP_64)
696 writel((pp->rx_fis_dma >> 16) >> 16,
697 port_mmio + PORT_FIS_ADDR_HI);
698 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
699
700 /* enable FIS reception */
701 tmp = readl(port_mmio + PORT_CMD);
702 tmp |= PORT_CMD_FIS_RX;
703 writel(tmp, port_mmio + PORT_CMD);
704
705 /* flush */
706 readl(port_mmio + PORT_CMD);
707 }
708 EXPORT_SYMBOL_GPL(ahci_start_fis_rx);
709
710 static int ahci_stop_fis_rx(struct ata_port *ap)
711 {
712 void __iomem *port_mmio = ahci_port_base(ap);
713 u32 tmp;
714
715 /* disable FIS reception */
716 tmp = readl(port_mmio + PORT_CMD);
717 tmp &= ~PORT_CMD_FIS_RX;
718 writel(tmp, port_mmio + PORT_CMD);
719
720 /* wait for completion, spec says 500ms, give it 1000 */
721 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
722 PORT_CMD_FIS_ON, 10, 1000);
723 if (tmp & PORT_CMD_FIS_ON)
724 return -EBUSY;
725
726 return 0;
727 }
728
729 static void ahci_power_up(struct ata_port *ap)
730 {
731 struct ahci_host_priv *hpriv = ap->host->private_data;
732 void __iomem *port_mmio = ahci_port_base(ap);
733 u32 cmd;
734
735 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
736
737 /* spin up device */
738 if (hpriv->cap & HOST_CAP_SSS) {
739 cmd |= PORT_CMD_SPIN_UP;
740 writel(cmd, port_mmio + PORT_CMD);
741 }
742
743 /* wake up link */
744 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
745 }
746
747 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
748 unsigned int hints)
749 {
750 struct ata_port *ap = link->ap;
751 struct ahci_host_priv *hpriv = ap->host->private_data;
752 struct ahci_port_priv *pp = ap->private_data;
753 void __iomem *port_mmio = ahci_port_base(ap);
754
755 if (policy != ATA_LPM_MAX_POWER) {
756 /* wakeup flag only applies to the max power policy */
757 hints &= ~ATA_LPM_WAKE_ONLY;
758
759 /*
760 * Disable interrupts on Phy Ready. This keeps us from
761 * getting woken up due to spurious phy ready
762 * interrupts.
763 */
764 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
765 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
766
767 sata_link_scr_lpm(link, policy, false);
768 }
769
770 if (hpriv->cap & HOST_CAP_ALPM) {
771 u32 cmd = readl(port_mmio + PORT_CMD);
772
773 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
774 if (!(hints & ATA_LPM_WAKE_ONLY))
775 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
776 cmd |= PORT_CMD_ICC_ACTIVE;
777
778 writel(cmd, port_mmio + PORT_CMD);
779 readl(port_mmio + PORT_CMD);
780
781 /* wait 10ms to be sure we've come out of LPM state */
782 ata_msleep(ap, 10);
783
784 if (hints & ATA_LPM_WAKE_ONLY)
785 return 0;
786 } else {
787 cmd |= PORT_CMD_ALPE;
788 if (policy == ATA_LPM_MIN_POWER)
789 cmd |= PORT_CMD_ASP;
790
791 /* write out new cmd value */
792 writel(cmd, port_mmio + PORT_CMD);
793 }
794 }
795
796 /* set aggressive device sleep */
797 if ((hpriv->cap2 & HOST_CAP2_SDS) &&
798 (hpriv->cap2 & HOST_CAP2_SADM) &&
799 (link->device->flags & ATA_DFLAG_DEVSLP)) {
800 if (policy == ATA_LPM_MIN_POWER)
801 ahci_set_aggressive_devslp(ap, true);
802 else
803 ahci_set_aggressive_devslp(ap, false);
804 }
805
806 if (policy == ATA_LPM_MAX_POWER) {
807 sata_link_scr_lpm(link, policy, false);
808
809 /* turn PHYRDY IRQ back on */
810 pp->intr_mask |= PORT_IRQ_PHYRDY;
811 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
812 }
813
814 return 0;
815 }
816
817 #ifdef CONFIG_PM
818 static void ahci_power_down(struct ata_port *ap)
819 {
820 struct ahci_host_priv *hpriv = ap->host->private_data;
821 void __iomem *port_mmio = ahci_port_base(ap);
822 u32 cmd, scontrol;
823
824 if (!(hpriv->cap & HOST_CAP_SSS))
825 return;
826
827 /* put device into listen mode, first set PxSCTL.DET to 0 */
828 scontrol = readl(port_mmio + PORT_SCR_CTL);
829 scontrol &= ~0xf;
830 writel(scontrol, port_mmio + PORT_SCR_CTL);
831
832 /* then set PxCMD.SUD to 0 */
833 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
834 cmd &= ~PORT_CMD_SPIN_UP;
835 writel(cmd, port_mmio + PORT_CMD);
836 }
837 #endif
838
839 static void ahci_start_port(struct ata_port *ap)
840 {
841 struct ahci_host_priv *hpriv = ap->host->private_data;
842 struct ahci_port_priv *pp = ap->private_data;
843 struct ata_link *link;
844 struct ahci_em_priv *emp;
845 ssize_t rc;
846 int i;
847
848 /* enable FIS reception */
849 ahci_start_fis_rx(ap);
850
851 /* enable DMA */
852 if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
853 hpriv->start_engine(ap);
854
855 /* turn on LEDs */
856 if (ap->flags & ATA_FLAG_EM) {
857 ata_for_each_link(link, ap, EDGE) {
858 emp = &pp->em_priv[link->pmp];
859
860 /* EM Transmit bit maybe busy during init */
861 for (i = 0; i < EM_MAX_RETRY; i++) {
862 rc = ap->ops->transmit_led_message(ap,
863 emp->led_state,
864 4);
865 /*
866 * If busy, give a breather but do not
867 * release EH ownership by using msleep()
868 * instead of ata_msleep(). EM Transmit
869 * bit is busy for the whole host and
870 * releasing ownership will cause other
871 * ports to fail the same way.
872 */
873 if (rc == -EBUSY)
874 msleep(1);
875 else
876 break;
877 }
878 }
879 }
880
881 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
882 ata_for_each_link(link, ap, EDGE)
883 ahci_init_sw_activity(link);
884
885 }
886
887 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
888 {
889 int rc;
890
891 /* disable DMA */
892 rc = ahci_stop_engine(ap);
893 if (rc) {
894 *emsg = "failed to stop engine";
895 return rc;
896 }
897
898 /* disable FIS reception */
899 rc = ahci_stop_fis_rx(ap);
900 if (rc) {
901 *emsg = "failed stop FIS RX";
902 return rc;
903 }
904
905 return 0;
906 }
907
908 int ahci_reset_controller(struct ata_host *host)
909 {
910 struct ahci_host_priv *hpriv = host->private_data;
911 void __iomem *mmio = hpriv->mmio;
912 u32 tmp;
913
914 /* we must be in AHCI mode, before using anything
915 * AHCI-specific, such as HOST_RESET.
916 */
917 ahci_enable_ahci(mmio);
918
919 /* global controller reset */
920 if (!ahci_skip_host_reset) {
921 tmp = readl(mmio + HOST_CTL);
922 if ((tmp & HOST_RESET) == 0) {
923 writel(tmp | HOST_RESET, mmio + HOST_CTL);
924 readl(mmio + HOST_CTL); /* flush */
925 }
926
927 /*
928 * to perform host reset, OS should set HOST_RESET
929 * and poll until this bit is read to be "0".
930 * reset must complete within 1 second, or
931 * the hardware should be considered fried.
932 */
933 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
934 HOST_RESET, 10, 1000);
935
936 if (tmp & HOST_RESET) {
937 dev_err(host->dev, "controller reset failed (0x%x)\n",
938 tmp);
939 return -EIO;
940 }
941
942 /* turn on AHCI mode */
943 ahci_enable_ahci(mmio);
944
945 /* Some registers might be cleared on reset. Restore
946 * initial values.
947 */
948 if (!(hpriv->flags & AHCI_HFLAG_NO_WRITE_TO_RO))
949 ahci_restore_initial_config(host);
950 } else
951 dev_info(host->dev, "skipping global host reset\n");
952
953 return 0;
954 }
955 EXPORT_SYMBOL_GPL(ahci_reset_controller);
956
957 static void ahci_sw_activity(struct ata_link *link)
958 {
959 struct ata_port *ap = link->ap;
960 struct ahci_port_priv *pp = ap->private_data;
961 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
962
963 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
964 return;
965
966 emp->activity++;
967 if (!timer_pending(&emp->timer))
968 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
969 }
970
971 static void ahci_sw_activity_blink(unsigned long arg)
972 {
973 struct ata_link *link = (struct ata_link *)arg;
974 struct ata_port *ap = link->ap;
975 struct ahci_port_priv *pp = ap->private_data;
976 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
977 unsigned long led_message = emp->led_state;
978 u32 activity_led_state;
979 unsigned long flags;
980
981 led_message &= EM_MSG_LED_VALUE;
982 led_message |= ap->port_no | (link->pmp << 8);
983
984 /* check to see if we've had activity. If so,
985 * toggle state of LED and reset timer. If not,
986 * turn LED to desired idle state.
987 */
988 spin_lock_irqsave(ap->lock, flags);
989 if (emp->saved_activity != emp->activity) {
990 emp->saved_activity = emp->activity;
991 /* get the current LED state */
992 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
993
994 if (activity_led_state)
995 activity_led_state = 0;
996 else
997 activity_led_state = 1;
998
999 /* clear old state */
1000 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
1001
1002 /* toggle state */
1003 led_message |= (activity_led_state << 16);
1004 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
1005 } else {
1006 /* switch to idle */
1007 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
1008 if (emp->blink_policy == BLINK_OFF)
1009 led_message |= (1 << 16);
1010 }
1011 spin_unlock_irqrestore(ap->lock, flags);
1012 ap->ops->transmit_led_message(ap, led_message, 4);
1013 }
1014
1015 static void ahci_init_sw_activity(struct ata_link *link)
1016 {
1017 struct ata_port *ap = link->ap;
1018 struct ahci_port_priv *pp = ap->private_data;
1019 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1020
1021 /* init activity stats, setup timer */
1022 emp->saved_activity = emp->activity = 0;
1023 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
1024
1025 /* check our blink policy and set flag for link if it's enabled */
1026 if (emp->blink_policy)
1027 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1028 }
1029
1030 int ahci_reset_em(struct ata_host *host)
1031 {
1032 struct ahci_host_priv *hpriv = host->private_data;
1033 void __iomem *mmio = hpriv->mmio;
1034 u32 em_ctl;
1035
1036 em_ctl = readl(mmio + HOST_EM_CTL);
1037 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
1038 return -EINVAL;
1039
1040 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
1041 return 0;
1042 }
1043 EXPORT_SYMBOL_GPL(ahci_reset_em);
1044
1045 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
1046 ssize_t size)
1047 {
1048 struct ahci_host_priv *hpriv = ap->host->private_data;
1049 struct ahci_port_priv *pp = ap->private_data;
1050 void __iomem *mmio = hpriv->mmio;
1051 u32 em_ctl;
1052 u32 message[] = {0, 0};
1053 unsigned long flags;
1054 int pmp;
1055 struct ahci_em_priv *emp;
1056
1057 /* get the slot number from the message */
1058 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1059 if (pmp < EM_MAX_SLOTS)
1060 emp = &pp->em_priv[pmp];
1061 else
1062 return -EINVAL;
1063
1064 ahci_rpm_get_port(ap);
1065 spin_lock_irqsave(ap->lock, flags);
1066
1067 /*
1068 * if we are still busy transmitting a previous message,
1069 * do not allow
1070 */
1071 em_ctl = readl(mmio + HOST_EM_CTL);
1072 if (em_ctl & EM_CTL_TM) {
1073 spin_unlock_irqrestore(ap->lock, flags);
1074 ahci_rpm_put_port(ap);
1075 return -EBUSY;
1076 }
1077
1078 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
1079 /*
1080 * create message header - this is all zero except for
1081 * the message size, which is 4 bytes.
1082 */
1083 message[0] |= (4 << 8);
1084
1085 /* ignore 0:4 of byte zero, fill in port info yourself */
1086 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
1087
1088 /* write message to EM_LOC */
1089 writel(message[0], mmio + hpriv->em_loc);
1090 writel(message[1], mmio + hpriv->em_loc+4);
1091
1092 /*
1093 * tell hardware to transmit the message
1094 */
1095 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1096 }
1097
1098 /* save off new led state for port/slot */
1099 emp->led_state = state;
1100
1101 spin_unlock_irqrestore(ap->lock, flags);
1102 ahci_rpm_put_port(ap);
1103
1104 return size;
1105 }
1106
1107 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1108 {
1109 struct ahci_port_priv *pp = ap->private_data;
1110 struct ata_link *link;
1111 struct ahci_em_priv *emp;
1112 int rc = 0;
1113
1114 ata_for_each_link(link, ap, EDGE) {
1115 emp = &pp->em_priv[link->pmp];
1116 rc += sprintf(buf, "%lx\n", emp->led_state);
1117 }
1118 return rc;
1119 }
1120
1121 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1122 size_t size)
1123 {
1124 unsigned int state;
1125 int pmp;
1126 struct ahci_port_priv *pp = ap->private_data;
1127 struct ahci_em_priv *emp;
1128
1129 if (kstrtouint(buf, 0, &state) < 0)
1130 return -EINVAL;
1131
1132 /* get the slot number from the message */
1133 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1134 if (pmp < EM_MAX_SLOTS)
1135 emp = &pp->em_priv[pmp];
1136 else
1137 return -EINVAL;
1138
1139 /* mask off the activity bits if we are in sw_activity
1140 * mode, user should turn off sw_activity before setting
1141 * activity led through em_message
1142 */
1143 if (emp->blink_policy)
1144 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1145
1146 return ap->ops->transmit_led_message(ap, state, size);
1147 }
1148
1149 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1150 {
1151 struct ata_link *link = dev->link;
1152 struct ata_port *ap = link->ap;
1153 struct ahci_port_priv *pp = ap->private_data;
1154 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1155 u32 port_led_state = emp->led_state;
1156
1157 /* save the desired Activity LED behavior */
1158 if (val == OFF) {
1159 /* clear LFLAG */
1160 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1161
1162 /* set the LED to OFF */
1163 port_led_state &= EM_MSG_LED_VALUE_OFF;
1164 port_led_state |= (ap->port_no | (link->pmp << 8));
1165 ap->ops->transmit_led_message(ap, port_led_state, 4);
1166 } else {
1167 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1168 if (val == BLINK_OFF) {
1169 /* set LED to ON for idle */
1170 port_led_state &= EM_MSG_LED_VALUE_OFF;
1171 port_led_state |= (ap->port_no | (link->pmp << 8));
1172 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1173 ap->ops->transmit_led_message(ap, port_led_state, 4);
1174 }
1175 }
1176 emp->blink_policy = val;
1177 return 0;
1178 }
1179
1180 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1181 {
1182 struct ata_link *link = dev->link;
1183 struct ata_port *ap = link->ap;
1184 struct ahci_port_priv *pp = ap->private_data;
1185 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1186
1187 /* display the saved value of activity behavior for this
1188 * disk.
1189 */
1190 return sprintf(buf, "%d\n", emp->blink_policy);
1191 }
1192
1193 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1194 int port_no, void __iomem *mmio,
1195 void __iomem *port_mmio)
1196 {
1197 struct ahci_host_priv *hpriv = ap->host->private_data;
1198 const char *emsg = NULL;
1199 int rc;
1200 u32 tmp;
1201
1202 /* make sure port is not active */
1203 rc = ahci_deinit_port(ap, &emsg);
1204 if (rc)
1205 dev_warn(dev, "%s (%d)\n", emsg, rc);
1206
1207 /* clear SError */
1208 tmp = readl(port_mmio + PORT_SCR_ERR);
1209 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1210 writel(tmp, port_mmio + PORT_SCR_ERR);
1211
1212 /* clear port IRQ */
1213 tmp = readl(port_mmio + PORT_IRQ_STAT);
1214 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1215 if (tmp)
1216 writel(tmp, port_mmio + PORT_IRQ_STAT);
1217
1218 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1219
1220 /* mark esata ports */
1221 tmp = readl(port_mmio + PORT_CMD);
1222 if ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS))
1223 ap->pflags |= ATA_PFLAG_EXTERNAL;
1224 }
1225
1226 void ahci_init_controller(struct ata_host *host)
1227 {
1228 struct ahci_host_priv *hpriv = host->private_data;
1229 void __iomem *mmio = hpriv->mmio;
1230 int i;
1231 void __iomem *port_mmio;
1232 u32 tmp;
1233
1234 for (i = 0; i < host->n_ports; i++) {
1235 struct ata_port *ap = host->ports[i];
1236
1237 port_mmio = ahci_port_base(ap);
1238 if (ata_port_is_dummy(ap))
1239 continue;
1240
1241 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1242 }
1243
1244 tmp = readl(mmio + HOST_CTL);
1245 VPRINTK("HOST_CTL 0x%x\n", tmp);
1246 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1247 tmp = readl(mmio + HOST_CTL);
1248 VPRINTK("HOST_CTL 0x%x\n", tmp);
1249 }
1250 EXPORT_SYMBOL_GPL(ahci_init_controller);
1251
1252 static void ahci_dev_config(struct ata_device *dev)
1253 {
1254 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1255
1256 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1257 dev->max_sectors = 255;
1258 ata_dev_info(dev,
1259 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1260 }
1261 }
1262
1263 unsigned int ahci_dev_classify(struct ata_port *ap)
1264 {
1265 void __iomem *port_mmio = ahci_port_base(ap);
1266 struct ata_taskfile tf;
1267 u32 tmp;
1268
1269 tmp = readl(port_mmio + PORT_SIG);
1270 tf.lbah = (tmp >> 24) & 0xff;
1271 tf.lbam = (tmp >> 16) & 0xff;
1272 tf.lbal = (tmp >> 8) & 0xff;
1273 tf.nsect = (tmp) & 0xff;
1274
1275 return ata_dev_classify(&tf);
1276 }
1277 EXPORT_SYMBOL_GPL(ahci_dev_classify);
1278
1279 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1280 u32 opts)
1281 {
1282 dma_addr_t cmd_tbl_dma;
1283
1284 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1285
1286 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1287 pp->cmd_slot[tag].status = 0;
1288 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1289 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1290 }
1291 EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1292
1293 int ahci_kick_engine(struct ata_port *ap)
1294 {
1295 void __iomem *port_mmio = ahci_port_base(ap);
1296 struct ahci_host_priv *hpriv = ap->host->private_data;
1297 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1298 u32 tmp;
1299 int busy, rc;
1300
1301 /* stop engine */
1302 rc = ahci_stop_engine(ap);
1303 if (rc)
1304 goto out_restart;
1305
1306 /* need to do CLO?
1307 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1308 */
1309 busy = status & (ATA_BUSY | ATA_DRQ);
1310 if (!busy && !sata_pmp_attached(ap)) {
1311 rc = 0;
1312 goto out_restart;
1313 }
1314
1315 if (!(hpriv->cap & HOST_CAP_CLO)) {
1316 rc = -EOPNOTSUPP;
1317 goto out_restart;
1318 }
1319
1320 /* perform CLO */
1321 tmp = readl(port_mmio + PORT_CMD);
1322 tmp |= PORT_CMD_CLO;
1323 writel(tmp, port_mmio + PORT_CMD);
1324
1325 rc = 0;
1326 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1327 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1328 if (tmp & PORT_CMD_CLO)
1329 rc = -EIO;
1330
1331 /* restart engine */
1332 out_restart:
1333 hpriv->start_engine(ap);
1334 return rc;
1335 }
1336 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1337
1338 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1339 struct ata_taskfile *tf, int is_cmd, u16 flags,
1340 unsigned long timeout_msec)
1341 {
1342 const u32 cmd_fis_len = 5; /* five dwords */
1343 struct ahci_port_priv *pp = ap->private_data;
1344 void __iomem *port_mmio = ahci_port_base(ap);
1345 u8 *fis = pp->cmd_tbl;
1346 u32 tmp;
1347
1348 /* prep the command */
1349 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1350 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1351
1352 /* set port value for softreset of Port Multiplier */
1353 if (pp->fbs_enabled && pp->fbs_last_dev != pmp) {
1354 tmp = readl(port_mmio + PORT_FBS);
1355 tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1356 tmp |= pmp << PORT_FBS_DEV_OFFSET;
1357 writel(tmp, port_mmio + PORT_FBS);
1358 pp->fbs_last_dev = pmp;
1359 }
1360
1361 /* issue & wait */
1362 writel(1, port_mmio + PORT_CMD_ISSUE);
1363
1364 if (timeout_msec) {
1365 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1366 0x1, 0x1, 1, timeout_msec);
1367 if (tmp & 0x1) {
1368 ahci_kick_engine(ap);
1369 return -EBUSY;
1370 }
1371 } else
1372 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1373
1374 return 0;
1375 }
1376
1377 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1378 int pmp, unsigned long deadline,
1379 int (*check_ready)(struct ata_link *link))
1380 {
1381 struct ata_port *ap = link->ap;
1382 struct ahci_host_priv *hpriv = ap->host->private_data;
1383 struct ahci_port_priv *pp = ap->private_data;
1384 const char *reason = NULL;
1385 unsigned long now, msecs;
1386 struct ata_taskfile tf;
1387 bool fbs_disabled = false;
1388 int rc;
1389
1390 DPRINTK("ENTER\n");
1391
1392 /* prepare for SRST (AHCI-1.1 10.4.1) */
1393 rc = ahci_kick_engine(ap);
1394 if (rc && rc != -EOPNOTSUPP)
1395 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1396
1397 /*
1398 * According to AHCI-1.2 9.3.9: if FBS is enable, software shall
1399 * clear PxFBS.EN to '0' prior to issuing software reset to devices
1400 * that is attached to port multiplier.
1401 */
1402 if (!ata_is_host_link(link) && pp->fbs_enabled) {
1403 ahci_disable_fbs(ap);
1404 fbs_disabled = true;
1405 }
1406
1407 ata_tf_init(link->device, &tf);
1408
1409 /* issue the first H2D Register FIS */
1410 msecs = 0;
1411 now = jiffies;
1412 if (time_after(deadline, now))
1413 msecs = jiffies_to_msecs(deadline - now);
1414
1415 tf.ctl |= ATA_SRST;
1416 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1417 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1418 rc = -EIO;
1419 reason = "1st FIS failed";
1420 goto fail;
1421 }
1422
1423 /* spec says at least 5us, but be generous and sleep for 1ms */
1424 ata_msleep(ap, 1);
1425
1426 /* issue the second H2D Register FIS */
1427 tf.ctl &= ~ATA_SRST;
1428 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1429
1430 /* wait for link to become ready */
1431 rc = ata_wait_after_reset(link, deadline, check_ready);
1432 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1433 /*
1434 * Workaround for cases where link online status can't
1435 * be trusted. Treat device readiness timeout as link
1436 * offline.
1437 */
1438 ata_link_info(link, "device not ready, treating as offline\n");
1439 *class = ATA_DEV_NONE;
1440 } else if (rc) {
1441 /* link occupied, -ENODEV too is an error */
1442 reason = "device not ready";
1443 goto fail;
1444 } else
1445 *class = ahci_dev_classify(ap);
1446
1447 /* re-enable FBS if disabled before */
1448 if (fbs_disabled)
1449 ahci_enable_fbs(ap);
1450
1451 DPRINTK("EXIT, class=%u\n", *class);
1452 return 0;
1453
1454 fail:
1455 ata_link_err(link, "softreset failed (%s)\n", reason);
1456 return rc;
1457 }
1458
1459 int ahci_check_ready(struct ata_link *link)
1460 {
1461 void __iomem *port_mmio = ahci_port_base(link->ap);
1462 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1463
1464 return ata_check_ready(status);
1465 }
1466 EXPORT_SYMBOL_GPL(ahci_check_ready);
1467
1468 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1469 unsigned long deadline)
1470 {
1471 int pmp = sata_srst_pmp(link);
1472
1473 DPRINTK("ENTER\n");
1474
1475 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1476 }
1477 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1478
1479 static int ahci_bad_pmp_check_ready(struct ata_link *link)
1480 {
1481 void __iomem *port_mmio = ahci_port_base(link->ap);
1482 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1483 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1484
1485 /*
1486 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1487 * which can save timeout delay.
1488 */
1489 if (irq_status & PORT_IRQ_BAD_PMP)
1490 return -EIO;
1491
1492 return ata_check_ready(status);
1493 }
1494
1495 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1496 unsigned long deadline)
1497 {
1498 struct ata_port *ap = link->ap;
1499 void __iomem *port_mmio = ahci_port_base(ap);
1500 int pmp = sata_srst_pmp(link);
1501 int rc;
1502 u32 irq_sts;
1503
1504 DPRINTK("ENTER\n");
1505
1506 rc = ahci_do_softreset(link, class, pmp, deadline,
1507 ahci_bad_pmp_check_ready);
1508
1509 /*
1510 * Soft reset fails with IPMS set when PMP is enabled but
1511 * SATA HDD/ODD is connected to SATA port, do soft reset
1512 * again to port 0.
1513 */
1514 if (rc == -EIO) {
1515 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1516 if (irq_sts & PORT_IRQ_BAD_PMP) {
1517 ata_link_warn(link,
1518 "applying PMP SRST workaround "
1519 "and retrying\n");
1520 rc = ahci_do_softreset(link, class, 0, deadline,
1521 ahci_check_ready);
1522 }
1523 }
1524
1525 return rc;
1526 }
1527
1528 int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
1529 unsigned long deadline, bool *online)
1530 {
1531 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1532 struct ata_port *ap = link->ap;
1533 struct ahci_port_priv *pp = ap->private_data;
1534 struct ahci_host_priv *hpriv = ap->host->private_data;
1535 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1536 struct ata_taskfile tf;
1537 int rc;
1538
1539 DPRINTK("ENTER\n");
1540
1541 ahci_stop_engine(ap);
1542
1543 /* clear D2H reception area to properly wait for D2H FIS */
1544 ata_tf_init(link->device, &tf);
1545 tf.command = ATA_BUSY;
1546 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1547
1548 rc = sata_link_hardreset(link, timing, deadline, online,
1549 ahci_check_ready);
1550
1551 hpriv->start_engine(ap);
1552
1553 if (*online)
1554 *class = ahci_dev_classify(ap);
1555
1556 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1557 return rc;
1558 }
1559 EXPORT_SYMBOL_GPL(ahci_do_hardreset);
1560
1561 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1562 unsigned long deadline)
1563 {
1564 bool online;
1565
1566 return ahci_do_hardreset(link, class, deadline, &online);
1567 }
1568
1569 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1570 {
1571 struct ata_port *ap = link->ap;
1572 void __iomem *port_mmio = ahci_port_base(ap);
1573 u32 new_tmp, tmp;
1574
1575 ata_std_postreset(link, class);
1576
1577 /* Make sure port's ATAPI bit is set appropriately */
1578 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1579 if (*class == ATA_DEV_ATAPI)
1580 new_tmp |= PORT_CMD_ATAPI;
1581 else
1582 new_tmp &= ~PORT_CMD_ATAPI;
1583 if (new_tmp != tmp) {
1584 writel(new_tmp, port_mmio + PORT_CMD);
1585 readl(port_mmio + PORT_CMD); /* flush */
1586 }
1587 }
1588
1589 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1590 {
1591 struct scatterlist *sg;
1592 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1593 unsigned int si;
1594
1595 VPRINTK("ENTER\n");
1596
1597 /*
1598 * Next, the S/G list.
1599 */
1600 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1601 dma_addr_t addr = sg_dma_address(sg);
1602 u32 sg_len = sg_dma_len(sg);
1603
1604 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1605 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1606 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1607 }
1608
1609 return si;
1610 }
1611
1612 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1613 {
1614 struct ata_port *ap = qc->ap;
1615 struct ahci_port_priv *pp = ap->private_data;
1616
1617 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1618 return ata_std_qc_defer(qc);
1619 else
1620 return sata_pmp_qc_defer_cmd_switch(qc);
1621 }
1622
1623 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1624 {
1625 struct ata_port *ap = qc->ap;
1626 struct ahci_port_priv *pp = ap->private_data;
1627 int is_atapi = ata_is_atapi(qc->tf.protocol);
1628 void *cmd_tbl;
1629 u32 opts;
1630 const u32 cmd_fis_len = 5; /* five dwords */
1631 unsigned int n_elem;
1632
1633 /*
1634 * Fill in command table information. First, the header,
1635 * a SATA Register - Host to Device command FIS.
1636 */
1637 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1638
1639 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1640 if (is_atapi) {
1641 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1642 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1643 }
1644
1645 n_elem = 0;
1646 if (qc->flags & ATA_QCFLAG_DMAMAP)
1647 n_elem = ahci_fill_sg(qc, cmd_tbl);
1648
1649 /*
1650 * Fill in command slot information.
1651 */
1652 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1653 if (qc->tf.flags & ATA_TFLAG_WRITE)
1654 opts |= AHCI_CMD_WRITE;
1655 if (is_atapi)
1656 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1657
1658 ahci_fill_cmd_slot(pp, qc->tag, opts);
1659 }
1660
1661 static void ahci_fbs_dec_intr(struct ata_port *ap)
1662 {
1663 struct ahci_port_priv *pp = ap->private_data;
1664 void __iomem *port_mmio = ahci_port_base(ap);
1665 u32 fbs = readl(port_mmio + PORT_FBS);
1666 int retries = 3;
1667
1668 DPRINTK("ENTER\n");
1669 BUG_ON(!pp->fbs_enabled);
1670
1671 /* time to wait for DEC is not specified by AHCI spec,
1672 * add a retry loop for safety.
1673 */
1674 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1675 fbs = readl(port_mmio + PORT_FBS);
1676 while ((fbs & PORT_FBS_DEC) && retries--) {
1677 udelay(1);
1678 fbs = readl(port_mmio + PORT_FBS);
1679 }
1680
1681 if (fbs & PORT_FBS_DEC)
1682 dev_err(ap->host->dev, "failed to clear device error\n");
1683 }
1684
1685 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1686 {
1687 struct ahci_host_priv *hpriv = ap->host->private_data;
1688 struct ahci_port_priv *pp = ap->private_data;
1689 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1690 struct ata_link *link = NULL;
1691 struct ata_queued_cmd *active_qc;
1692 struct ata_eh_info *active_ehi;
1693 bool fbs_need_dec = false;
1694 u32 serror;
1695
1696 /* determine active link with error */
1697 if (pp->fbs_enabled) {
1698 void __iomem *port_mmio = ahci_port_base(ap);
1699 u32 fbs = readl(port_mmio + PORT_FBS);
1700 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1701
1702 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
1703 link = &ap->pmp_link[pmp];
1704 fbs_need_dec = true;
1705 }
1706
1707 } else
1708 ata_for_each_link(link, ap, EDGE)
1709 if (ata_link_active(link))
1710 break;
1711
1712 if (!link)
1713 link = &ap->link;
1714
1715 active_qc = ata_qc_from_tag(ap, link->active_tag);
1716 active_ehi = &link->eh_info;
1717
1718 /* record irq stat */
1719 ata_ehi_clear_desc(host_ehi);
1720 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1721
1722 /* AHCI needs SError cleared; otherwise, it might lock up */
1723 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1724 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1725 host_ehi->serror |= serror;
1726
1727 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1728 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1729 irq_stat &= ~PORT_IRQ_IF_ERR;
1730
1731 if (irq_stat & PORT_IRQ_TF_ERR) {
1732 /* If qc is active, charge it; otherwise, the active
1733 * link. There's no active qc on NCQ errors. It will
1734 * be determined by EH by reading log page 10h.
1735 */
1736 if (active_qc)
1737 active_qc->err_mask |= AC_ERR_DEV;
1738 else
1739 active_ehi->err_mask |= AC_ERR_DEV;
1740
1741 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1742 host_ehi->serror &= ~SERR_INTERNAL;
1743 }
1744
1745 if (irq_stat & PORT_IRQ_UNK_FIS) {
1746 u32 *unk = pp->rx_fis + RX_FIS_UNK;
1747
1748 active_ehi->err_mask |= AC_ERR_HSM;
1749 active_ehi->action |= ATA_EH_RESET;
1750 ata_ehi_push_desc(active_ehi,
1751 "unknown FIS %08x %08x %08x %08x" ,
1752 unk[0], unk[1], unk[2], unk[3]);
1753 }
1754
1755 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1756 active_ehi->err_mask |= AC_ERR_HSM;
1757 active_ehi->action |= ATA_EH_RESET;
1758 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1759 }
1760
1761 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1762 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1763 host_ehi->action |= ATA_EH_RESET;
1764 ata_ehi_push_desc(host_ehi, "host bus error");
1765 }
1766
1767 if (irq_stat & PORT_IRQ_IF_ERR) {
1768 if (fbs_need_dec)
1769 active_ehi->err_mask |= AC_ERR_DEV;
1770 else {
1771 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1772 host_ehi->action |= ATA_EH_RESET;
1773 }
1774
1775 ata_ehi_push_desc(host_ehi, "interface fatal error");
1776 }
1777
1778 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1779 ata_ehi_hotplugged(host_ehi);
1780 ata_ehi_push_desc(host_ehi, "%s",
1781 irq_stat & PORT_IRQ_CONNECT ?
1782 "connection status changed" : "PHY RDY changed");
1783 }
1784
1785 /* okay, let's hand over to EH */
1786
1787 if (irq_stat & PORT_IRQ_FREEZE)
1788 ata_port_freeze(ap);
1789 else if (fbs_need_dec) {
1790 ata_link_abort(link);
1791 ahci_fbs_dec_intr(ap);
1792 } else
1793 ata_port_abort(ap);
1794 }
1795
1796 static void ahci_handle_port_interrupt(struct ata_port *ap,
1797 void __iomem *port_mmio, u32 status)
1798 {
1799 struct ata_eh_info *ehi = &ap->link.eh_info;
1800 struct ahci_port_priv *pp = ap->private_data;
1801 struct ahci_host_priv *hpriv = ap->host->private_data;
1802 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1803 u32 qc_active = 0;
1804 int rc;
1805
1806 /* ignore BAD_PMP while resetting */
1807 if (unlikely(resetting))
1808 status &= ~PORT_IRQ_BAD_PMP;
1809
1810 if (sata_lpm_ignore_phy_events(&ap->link)) {
1811 status &= ~PORT_IRQ_PHYRDY;
1812 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1813 }
1814
1815 if (unlikely(status & PORT_IRQ_ERROR)) {
1816 ahci_error_intr(ap, status);
1817 return;
1818 }
1819
1820 if (status & PORT_IRQ_SDB_FIS) {
1821 /* If SNotification is available, leave notification
1822 * handling to sata_async_notification(). If not,
1823 * emulate it by snooping SDB FIS RX area.
1824 *
1825 * Snooping FIS RX area is probably cheaper than
1826 * poking SNotification but some constrollers which
1827 * implement SNotification, ICH9 for example, don't
1828 * store AN SDB FIS into receive area.
1829 */
1830 if (hpriv->cap & HOST_CAP_SNTF)
1831 sata_async_notification(ap);
1832 else {
1833 /* If the 'N' bit in word 0 of the FIS is set,
1834 * we just received asynchronous notification.
1835 * Tell libata about it.
1836 *
1837 * Lack of SNotification should not appear in
1838 * ahci 1.2, so the workaround is unnecessary
1839 * when FBS is enabled.
1840 */
1841 if (pp->fbs_enabled)
1842 WARN_ON_ONCE(1);
1843 else {
1844 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1845 u32 f0 = le32_to_cpu(f[0]);
1846 if (f0 & (1 << 15))
1847 sata_async_notification(ap);
1848 }
1849 }
1850 }
1851
1852 /* pp->active_link is not reliable once FBS is enabled, both
1853 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1854 * NCQ and non-NCQ commands may be in flight at the same time.
1855 */
1856 if (pp->fbs_enabled) {
1857 if (ap->qc_active) {
1858 qc_active = readl(port_mmio + PORT_SCR_ACT);
1859 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1860 }
1861 } else {
1862 /* pp->active_link is valid iff any command is in flight */
1863 if (ap->qc_active && pp->active_link->sactive)
1864 qc_active = readl(port_mmio + PORT_SCR_ACT);
1865 else
1866 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1867 }
1868
1869
1870 rc = ata_qc_complete_multiple(ap, qc_active);
1871
1872 /* while resetting, invalid completions are expected */
1873 if (unlikely(rc < 0 && !resetting)) {
1874 ehi->err_mask |= AC_ERR_HSM;
1875 ehi->action |= ATA_EH_RESET;
1876 ata_port_freeze(ap);
1877 }
1878 }
1879
1880 static void ahci_port_intr(struct ata_port *ap)
1881 {
1882 void __iomem *port_mmio = ahci_port_base(ap);
1883 u32 status;
1884
1885 status = readl(port_mmio + PORT_IRQ_STAT);
1886 writel(status, port_mmio + PORT_IRQ_STAT);
1887
1888 ahci_handle_port_interrupt(ap, port_mmio, status);
1889 }
1890
1891 static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
1892 {
1893 struct ata_port *ap = dev_instance;
1894 void __iomem *port_mmio = ahci_port_base(ap);
1895 u32 status;
1896
1897 VPRINTK("ENTER\n");
1898
1899 status = readl(port_mmio + PORT_IRQ_STAT);
1900 writel(status, port_mmio + PORT_IRQ_STAT);
1901
1902 spin_lock(ap->lock);
1903 ahci_handle_port_interrupt(ap, port_mmio, status);
1904 spin_unlock(ap->lock);
1905
1906 VPRINTK("EXIT\n");
1907
1908 return IRQ_HANDLED;
1909 }
1910
1911 u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
1912 {
1913 unsigned int i, handled = 0;
1914
1915 for (i = 0; i < host->n_ports; i++) {
1916 struct ata_port *ap;
1917
1918 if (!(irq_masked & (1 << i)))
1919 continue;
1920
1921 ap = host->ports[i];
1922 if (ap) {
1923 ahci_port_intr(ap);
1924 VPRINTK("port %u\n", i);
1925 } else {
1926 VPRINTK("port %u (no irq)\n", i);
1927 if (ata_ratelimit())
1928 dev_warn(host->dev,
1929 "interrupt on disabled port %u\n", i);
1930 }
1931
1932 handled = 1;
1933 }
1934
1935 return handled;
1936 }
1937 EXPORT_SYMBOL_GPL(ahci_handle_port_intr);
1938
1939 static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
1940 {
1941 struct ata_host *host = dev_instance;
1942 struct ahci_host_priv *hpriv;
1943 unsigned int rc = 0;
1944 void __iomem *mmio;
1945 u32 irq_stat, irq_masked;
1946
1947 VPRINTK("ENTER\n");
1948
1949 hpriv = host->private_data;
1950 mmio = hpriv->mmio;
1951
1952 /* sigh. 0xffffffff is a valid return from h/w */
1953 irq_stat = readl(mmio + HOST_IRQ_STAT);
1954 if (!irq_stat)
1955 return IRQ_NONE;
1956
1957 irq_masked = irq_stat & hpriv->port_map;
1958
1959 spin_lock(&host->lock);
1960
1961 rc = ahci_handle_port_intr(host, irq_masked);
1962
1963 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1964 * it should be cleared after all the port events are cleared;
1965 * otherwise, it will raise a spurious interrupt after each
1966 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1967 * information.
1968 *
1969 * Also, use the unmasked value to clear interrupt as spurious
1970 * pending event on a dummy port might cause screaming IRQ.
1971 */
1972 writel(irq_stat, mmio + HOST_IRQ_STAT);
1973
1974 spin_unlock(&host->lock);
1975
1976 VPRINTK("EXIT\n");
1977
1978 return IRQ_RETVAL(rc);
1979 }
1980
1981 unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1982 {
1983 struct ata_port *ap = qc->ap;
1984 void __iomem *port_mmio = ahci_port_base(ap);
1985 struct ahci_port_priv *pp = ap->private_data;
1986
1987 /* Keep track of the currently active link. It will be used
1988 * in completion path to determine whether NCQ phase is in
1989 * progress.
1990 */
1991 pp->active_link = qc->dev->link;
1992
1993 if (ata_is_ncq(qc->tf.protocol))
1994 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1995
1996 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1997 u32 fbs = readl(port_mmio + PORT_FBS);
1998 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1999 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
2000 writel(fbs, port_mmio + PORT_FBS);
2001 pp->fbs_last_dev = qc->dev->link->pmp;
2002 }
2003
2004 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
2005
2006 ahci_sw_activity(qc->dev->link);
2007
2008 return 0;
2009 }
2010 EXPORT_SYMBOL_GPL(ahci_qc_issue);
2011
2012 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
2013 {
2014 struct ahci_port_priv *pp = qc->ap->private_data;
2015 u8 *rx_fis = pp->rx_fis;
2016
2017 if (pp->fbs_enabled)
2018 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
2019
2020 /*
2021 * After a successful execution of an ATA PIO data-in command,
2022 * the device doesn't send D2H Reg FIS to update the TF and
2023 * the host should take TF and E_Status from the preceding PIO
2024 * Setup FIS.
2025 */
2026 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
2027 !(qc->flags & ATA_QCFLAG_FAILED)) {
2028 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
2029 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
2030 } else
2031 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
2032
2033 return true;
2034 }
2035
2036 static void ahci_freeze(struct ata_port *ap)
2037 {
2038 void __iomem *port_mmio = ahci_port_base(ap);
2039
2040 /* turn IRQ off */
2041 writel(0, port_mmio + PORT_IRQ_MASK);
2042 }
2043
2044 static void ahci_thaw(struct ata_port *ap)
2045 {
2046 struct ahci_host_priv *hpriv = ap->host->private_data;
2047 void __iomem *mmio = hpriv->mmio;
2048 void __iomem *port_mmio = ahci_port_base(ap);
2049 u32 tmp;
2050 struct ahci_port_priv *pp = ap->private_data;
2051
2052 /* clear IRQ */
2053 tmp = readl(port_mmio + PORT_IRQ_STAT);
2054 writel(tmp, port_mmio + PORT_IRQ_STAT);
2055 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
2056
2057 /* turn IRQ back on */
2058 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2059 }
2060
2061 void ahci_error_handler(struct ata_port *ap)
2062 {
2063 struct ahci_host_priv *hpriv = ap->host->private_data;
2064
2065 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
2066 /* restart engine */
2067 ahci_stop_engine(ap);
2068 hpriv->start_engine(ap);
2069 }
2070
2071 sata_pmp_error_handler(ap);
2072
2073 if (!ata_dev_enabled(ap->link.device))
2074 ahci_stop_engine(ap);
2075 }
2076 EXPORT_SYMBOL_GPL(ahci_error_handler);
2077
2078 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
2079 {
2080 struct ata_port *ap = qc->ap;
2081
2082 /* make DMA engine forget about the failed command */
2083 if (qc->flags & ATA_QCFLAG_FAILED)
2084 ahci_kick_engine(ap);
2085 }
2086
2087 static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2088 {
2089 struct ahci_host_priv *hpriv = ap->host->private_data;
2090 void __iomem *port_mmio = ahci_port_base(ap);
2091 struct ata_device *dev = ap->link.device;
2092 u32 devslp, dm, dito, mdat, deto;
2093 int rc;
2094 unsigned int err_mask;
2095
2096 devslp = readl(port_mmio + PORT_DEVSLP);
2097 if (!(devslp & PORT_DEVSLP_DSP)) {
2098 dev_info(ap->host->dev, "port does not support device sleep\n");
2099 return;
2100 }
2101
2102 /* disable device sleep */
2103 if (!sleep) {
2104 if (devslp & PORT_DEVSLP_ADSE) {
2105 writel(devslp & ~PORT_DEVSLP_ADSE,
2106 port_mmio + PORT_DEVSLP);
2107 err_mask = ata_dev_set_feature(dev,
2108 SETFEATURES_SATA_DISABLE,
2109 SATA_DEVSLP);
2110 if (err_mask && err_mask != AC_ERR_DEV)
2111 ata_dev_warn(dev, "failed to disable DEVSLP\n");
2112 }
2113 return;
2114 }
2115
2116 /* device sleep was already enabled */
2117 if (devslp & PORT_DEVSLP_ADSE)
2118 return;
2119
2120 /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2121 rc = ahci_stop_engine(ap);
2122 if (rc)
2123 return;
2124
2125 dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2126 dito = devslp_idle_timeout / (dm + 1);
2127 if (dito > 0x3ff)
2128 dito = 0x3ff;
2129
2130 /* Use the nominal value 10 ms if the read MDAT is zero,
2131 * the nominal value of DETO is 20 ms.
2132 */
2133 if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2134 ATA_LOG_DEVSLP_VALID_MASK) {
2135 mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2136 ATA_LOG_DEVSLP_MDAT_MASK;
2137 if (!mdat)
2138 mdat = 10;
2139 deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2140 if (!deto)
2141 deto = 20;
2142 } else {
2143 mdat = 10;
2144 deto = 20;
2145 }
2146
2147 devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2148 (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2149 (deto << PORT_DEVSLP_DETO_OFFSET) |
2150 PORT_DEVSLP_ADSE);
2151 writel(devslp, port_mmio + PORT_DEVSLP);
2152
2153 hpriv->start_engine(ap);
2154
2155 /* enable device sleep feature for the drive */
2156 err_mask = ata_dev_set_feature(dev,
2157 SETFEATURES_SATA_ENABLE,
2158 SATA_DEVSLP);
2159 if (err_mask && err_mask != AC_ERR_DEV)
2160 ata_dev_warn(dev, "failed to enable DEVSLP\n");
2161 }
2162
2163 static void ahci_enable_fbs(struct ata_port *ap)
2164 {
2165 struct ahci_host_priv *hpriv = ap->host->private_data;
2166 struct ahci_port_priv *pp = ap->private_data;
2167 void __iomem *port_mmio = ahci_port_base(ap);
2168 u32 fbs;
2169 int rc;
2170
2171 if (!pp->fbs_supported)
2172 return;
2173
2174 fbs = readl(port_mmio + PORT_FBS);
2175 if (fbs & PORT_FBS_EN) {
2176 pp->fbs_enabled = true;
2177 pp->fbs_last_dev = -1; /* initialization */
2178 return;
2179 }
2180
2181 rc = ahci_stop_engine(ap);
2182 if (rc)
2183 return;
2184
2185 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2186 fbs = readl(port_mmio + PORT_FBS);
2187 if (fbs & PORT_FBS_EN) {
2188 dev_info(ap->host->dev, "FBS is enabled\n");
2189 pp->fbs_enabled = true;
2190 pp->fbs_last_dev = -1; /* initialization */
2191 } else
2192 dev_err(ap->host->dev, "Failed to enable FBS\n");
2193
2194 hpriv->start_engine(ap);
2195 }
2196
2197 static void ahci_disable_fbs(struct ata_port *ap)
2198 {
2199 struct ahci_host_priv *hpriv = ap->host->private_data;
2200 struct ahci_port_priv *pp = ap->private_data;
2201 void __iomem *port_mmio = ahci_port_base(ap);
2202 u32 fbs;
2203 int rc;
2204
2205 if (!pp->fbs_supported)
2206 return;
2207
2208 fbs = readl(port_mmio + PORT_FBS);
2209 if ((fbs & PORT_FBS_EN) == 0) {
2210 pp->fbs_enabled = false;
2211 return;
2212 }
2213
2214 rc = ahci_stop_engine(ap);
2215 if (rc)
2216 return;
2217
2218 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2219 fbs = readl(port_mmio + PORT_FBS);
2220 if (fbs & PORT_FBS_EN)
2221 dev_err(ap->host->dev, "Failed to disable FBS\n");
2222 else {
2223 dev_info(ap->host->dev, "FBS is disabled\n");
2224 pp->fbs_enabled = false;
2225 }
2226
2227 hpriv->start_engine(ap);
2228 }
2229
2230 static void ahci_pmp_attach(struct ata_port *ap)
2231 {
2232 void __iomem *port_mmio = ahci_port_base(ap);
2233 struct ahci_port_priv *pp = ap->private_data;
2234 u32 cmd;
2235
2236 cmd = readl(port_mmio + PORT_CMD);
2237 cmd |= PORT_CMD_PMP;
2238 writel(cmd, port_mmio + PORT_CMD);
2239
2240 ahci_enable_fbs(ap);
2241
2242 pp->intr_mask |= PORT_IRQ_BAD_PMP;
2243
2244 /*
2245 * We must not change the port interrupt mask register if the
2246 * port is marked frozen, the value in pp->intr_mask will be
2247 * restored later when the port is thawed.
2248 *
2249 * Note that during initialization, the port is marked as
2250 * frozen since the irq handler is not yet registered.
2251 */
2252 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2253 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2254 }
2255
2256 static void ahci_pmp_detach(struct ata_port *ap)
2257 {
2258 void __iomem *port_mmio = ahci_port_base(ap);
2259 struct ahci_port_priv *pp = ap->private_data;
2260 u32 cmd;
2261
2262 ahci_disable_fbs(ap);
2263
2264 cmd = readl(port_mmio + PORT_CMD);
2265 cmd &= ~PORT_CMD_PMP;
2266 writel(cmd, port_mmio + PORT_CMD);
2267
2268 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2269
2270 /* see comment above in ahci_pmp_attach() */
2271 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2272 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2273 }
2274
2275 int ahci_port_resume(struct ata_port *ap)
2276 {
2277 ahci_rpm_get_port(ap);
2278
2279 ahci_power_up(ap);
2280 ahci_start_port(ap);
2281
2282 if (sata_pmp_attached(ap))
2283 ahci_pmp_attach(ap);
2284 else
2285 ahci_pmp_detach(ap);
2286
2287 return 0;
2288 }
2289 EXPORT_SYMBOL_GPL(ahci_port_resume);
2290
2291 #ifdef CONFIG_PM
2292 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2293 {
2294 const char *emsg = NULL;
2295 int rc;
2296
2297 rc = ahci_deinit_port(ap, &emsg);
2298 if (rc == 0)
2299 ahci_power_down(ap);
2300 else {
2301 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2302 ata_port_freeze(ap);
2303 }
2304
2305 ahci_rpm_put_port(ap);
2306 return rc;
2307 }
2308 #endif
2309
2310 static int ahci_port_start(struct ata_port *ap)
2311 {
2312 struct ahci_host_priv *hpriv = ap->host->private_data;
2313 struct device *dev = ap->host->dev;
2314 struct ahci_port_priv *pp;
2315 void *mem;
2316 dma_addr_t mem_dma;
2317 size_t dma_sz, rx_fis_sz;
2318
2319 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2320 if (!pp)
2321 return -ENOMEM;
2322
2323 if (ap->host->n_ports > 1) {
2324 pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
2325 if (!pp->irq_desc) {
2326 devm_kfree(dev, pp);
2327 return -ENOMEM;
2328 }
2329 snprintf(pp->irq_desc, 8,
2330 "%s%d", dev_driver_string(dev), ap->port_no);
2331 }
2332
2333 /* check FBS capability */
2334 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2335 void __iomem *port_mmio = ahci_port_base(ap);
2336 u32 cmd = readl(port_mmio + PORT_CMD);
2337 if (cmd & PORT_CMD_FBSCP)
2338 pp->fbs_supported = true;
2339 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2340 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2341 ap->port_no);
2342 pp->fbs_supported = true;
2343 } else
2344 dev_warn(dev, "port %d is not capable of FBS\n",
2345 ap->port_no);
2346 }
2347
2348 if (pp->fbs_supported) {
2349 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2350 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2351 } else {
2352 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2353 rx_fis_sz = AHCI_RX_FIS_SZ;
2354 }
2355
2356 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2357 if (!mem)
2358 return -ENOMEM;
2359 memset(mem, 0, dma_sz);
2360
2361 /*
2362 * First item in chunk of DMA memory: 32-slot command table,
2363 * 32 bytes each in size
2364 */
2365 pp->cmd_slot = mem;
2366 pp->cmd_slot_dma = mem_dma;
2367
2368 mem += AHCI_CMD_SLOT_SZ;
2369 mem_dma += AHCI_CMD_SLOT_SZ;
2370
2371 /*
2372 * Second item: Received-FIS area
2373 */
2374 pp->rx_fis = mem;
2375 pp->rx_fis_dma = mem_dma;
2376
2377 mem += rx_fis_sz;
2378 mem_dma += rx_fis_sz;
2379
2380 /*
2381 * Third item: data area for storing a single command
2382 * and its scatter-gather table
2383 */
2384 pp->cmd_tbl = mem;
2385 pp->cmd_tbl_dma = mem_dma;
2386
2387 /*
2388 * Save off initial list of interrupts to be enabled.
2389 * This could be changed later
2390 */
2391 pp->intr_mask = DEF_PORT_IRQ;
2392
2393 /*
2394 * Switch to per-port locking in case each port has its own MSI vector.
2395 */
2396 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2397 spin_lock_init(&pp->lock);
2398 ap->lock = &pp->lock;
2399 }
2400
2401 ap->private_data = pp;
2402
2403 /* engage engines, captain */
2404 return ahci_port_resume(ap);
2405 }
2406
2407 static void ahci_port_stop(struct ata_port *ap)
2408 {
2409 const char *emsg = NULL;
2410 struct ahci_host_priv *hpriv = ap->host->private_data;
2411 void __iomem *host_mmio = hpriv->mmio;
2412 int rc;
2413
2414 /* de-initialize port */
2415 rc = ahci_deinit_port(ap, &emsg);
2416 if (rc)
2417 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2418
2419 /*
2420 * Clear GHC.IS to prevent stuck INTx after disabling MSI and
2421 * re-enabling INTx.
2422 */
2423 writel(1 << ap->port_no, host_mmio + HOST_IRQ_STAT);
2424 }
2425
2426 void ahci_print_info(struct ata_host *host, const char *scc_s)
2427 {
2428 struct ahci_host_priv *hpriv = host->private_data;
2429 u32 vers, cap, cap2, impl, speed;
2430 const char *speed_s;
2431
2432 vers = hpriv->version;
2433 cap = hpriv->cap;
2434 cap2 = hpriv->cap2;
2435 impl = hpriv->port_map;
2436
2437 speed = (cap >> 20) & 0xf;
2438 if (speed == 1)
2439 speed_s = "1.5";
2440 else if (speed == 2)
2441 speed_s = "3";
2442 else if (speed == 3)
2443 speed_s = "6";
2444 else
2445 speed_s = "?";
2446
2447 dev_info(host->dev,
2448 "AHCI %02x%02x.%02x%02x "
2449 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2450 ,
2451
2452 (vers >> 24) & 0xff,
2453 (vers >> 16) & 0xff,
2454 (vers >> 8) & 0xff,
2455 vers & 0xff,
2456
2457 ((cap >> 8) & 0x1f) + 1,
2458 (cap & 0x1f) + 1,
2459 speed_s,
2460 impl,
2461 scc_s);
2462
2463 dev_info(host->dev,
2464 "flags: "
2465 "%s%s%s%s%s%s%s"
2466 "%s%s%s%s%s%s%s"
2467 "%s%s%s%s%s%s%s"
2468 "%s%s\n"
2469 ,
2470
2471 cap & HOST_CAP_64 ? "64bit " : "",
2472 cap & HOST_CAP_NCQ ? "ncq " : "",
2473 cap & HOST_CAP_SNTF ? "sntf " : "",
2474 cap & HOST_CAP_MPS ? "ilck " : "",
2475 cap & HOST_CAP_SSS ? "stag " : "",
2476 cap & HOST_CAP_ALPM ? "pm " : "",
2477 cap & HOST_CAP_LED ? "led " : "",
2478 cap & HOST_CAP_CLO ? "clo " : "",
2479 cap & HOST_CAP_ONLY ? "only " : "",
2480 cap & HOST_CAP_PMP ? "pmp " : "",
2481 cap & HOST_CAP_FBS ? "fbs " : "",
2482 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2483 cap & HOST_CAP_SSC ? "slum " : "",
2484 cap & HOST_CAP_PART ? "part " : "",
2485 cap & HOST_CAP_CCC ? "ccc " : "",
2486 cap & HOST_CAP_EMS ? "ems " : "",
2487 cap & HOST_CAP_SXS ? "sxs " : "",
2488 cap2 & HOST_CAP2_DESO ? "deso " : "",
2489 cap2 & HOST_CAP2_SADM ? "sadm " : "",
2490 cap2 & HOST_CAP2_SDS ? "sds " : "",
2491 cap2 & HOST_CAP2_APST ? "apst " : "",
2492 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2493 cap2 & HOST_CAP2_BOH ? "boh " : ""
2494 );
2495 }
2496 EXPORT_SYMBOL_GPL(ahci_print_info);
2497
2498 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2499 struct ata_port_info *pi)
2500 {
2501 u8 messages;
2502 void __iomem *mmio = hpriv->mmio;
2503 u32 em_loc = readl(mmio + HOST_EM_LOC);
2504 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2505
2506 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2507 return;
2508
2509 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2510
2511 if (messages) {
2512 /* store em_loc */
2513 hpriv->em_loc = ((em_loc >> 16) * 4);
2514 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2515 hpriv->em_msg_type = messages;
2516 pi->flags |= ATA_FLAG_EM;
2517 if (!(em_ctl & EM_CTL_ALHD))
2518 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2519 }
2520 }
2521 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2522
2523 static int ahci_host_activate_multi_irqs(struct ata_host *host,
2524 struct scsi_host_template *sht)
2525 {
2526 struct ahci_host_priv *hpriv = host->private_data;
2527 int i, rc;
2528
2529 rc = ata_host_start(host);
2530 if (rc)
2531 return rc;
2532 /*
2533 * Requests IRQs according to AHCI-1.1 when multiple MSIs were
2534 * allocated. That is one MSI per port, starting from @irq.
2535 */
2536 for (i = 0; i < host->n_ports; i++) {
2537 struct ahci_port_priv *pp = host->ports[i]->private_data;
2538 int irq = hpriv->get_irq_vector(host, i);
2539
2540 /* Do not receive interrupts sent by dummy ports */
2541 if (!pp) {
2542 disable_irq(irq);
2543 continue;
2544 }
2545
2546 rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
2547 0, pp->irq_desc, host->ports[i]);
2548
2549 if (rc)
2550 return rc;
2551 ata_port_desc(host->ports[i], "irq %d", irq);
2552 }
2553
2554 return ata_host_register(host, sht);
2555 }
2556
2557 /**
2558 * ahci_host_activate - start AHCI host, request IRQs and register it
2559 * @host: target ATA host
2560 * @sht: scsi_host_template to use when registering the host
2561 *
2562 * LOCKING:
2563 * Inherited from calling layer (may sleep).
2564 *
2565 * RETURNS:
2566 * 0 on success, -errno otherwise.
2567 */
2568 int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
2569 {
2570 struct ahci_host_priv *hpriv = host->private_data;
2571 int irq = hpriv->irq;
2572 int rc;
2573
2574 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2575 if (hpriv->irq_handler)
2576 dev_warn(host->dev,
2577 "both AHCI_HFLAG_MULTI_MSI flag set and custom irq handler implemented\n");
2578 if (!hpriv->get_irq_vector) {
2579 dev_err(host->dev,
2580 "AHCI_HFLAG_MULTI_MSI requires ->get_irq_vector!\n");
2581 return -EIO;
2582 }
2583
2584 rc = ahci_host_activate_multi_irqs(host, sht);
2585 } else {
2586 rc = ata_host_activate(host, irq, hpriv->irq_handler,
2587 IRQF_SHARED, sht);
2588 }
2589
2590
2591 return rc;
2592 }
2593 EXPORT_SYMBOL_GPL(ahci_host_activate);
2594
2595 MODULE_AUTHOR("Jeff Garzik");
2596 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2597 MODULE_LICENSE("GPL");
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