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arm64: dts: r8a7796: Enable HSCIF DMA
[linux-2.6/btrfs-unstable.git] / drivers / ata / libahci.c
blob3159f9e66d8f06383ece2b41508fde83ac59d21f
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 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 (hpriv->force_port_map && port_map != hpriv->force_port_map) {
508 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
509 port_map, hpriv->force_port_map);
510 port_map = hpriv->force_port_map;
511 hpriv->saved_port_map = port_map;
512 }
513
514 if (hpriv->mask_port_map) {
515 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
516 port_map,
517 port_map & hpriv->mask_port_map);
518 port_map &= hpriv->mask_port_map;
519 }
520
521 /* cross check port_map and cap.n_ports */
522 if (port_map) {
523 int map_ports = 0;
524
525 for (i = 0; i < AHCI_MAX_PORTS; i++)
526 if (port_map & (1 << i))
527 map_ports++;
528
529 /* If PI has more ports than n_ports, whine, clear
530 * port_map and let it be generated from n_ports.
531 */
532 if (map_ports > ahci_nr_ports(cap)) {
533 dev_warn(dev,
534 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
535 port_map, ahci_nr_ports(cap));
536 port_map = 0;
537 }
538 }
539
540 /* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
541 if (!port_map && vers < 0x10300) {
542 port_map = (1 << ahci_nr_ports(cap)) - 1;
543 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
544
545 /* write the fixed up value to the PI register */
546 hpriv->saved_port_map = port_map;
547 }
548
549 /* record values to use during operation */
550 hpriv->cap = cap;
551 hpriv->cap2 = cap2;
552 hpriv->version = readl(mmio + HOST_VERSION);
553 hpriv->port_map = port_map;
554
555 if (!hpriv->start_engine)
556 hpriv->start_engine = ahci_start_engine;
557
558 if (!hpriv->irq_handler)
559 hpriv->irq_handler = ahci_single_level_irq_intr;
560 }
561 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
562
563 /**
564 * ahci_restore_initial_config - Restore initial config
565 * @host: target ATA host
566 *
567 * Restore initial config stored by ahci_save_initial_config().
568 *
569 * LOCKING:
570 * None.
571 */
572 static void ahci_restore_initial_config(struct ata_host *host)
573 {
574 struct ahci_host_priv *hpriv = host->private_data;
575 void __iomem *mmio = hpriv->mmio;
576
577 writel(hpriv->saved_cap, mmio + HOST_CAP);
578 if (hpriv->saved_cap2)
579 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
580 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
581 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
582 }
583
584 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
585 {
586 static const int offset[] = {
587 [SCR_STATUS] = PORT_SCR_STAT,
588 [SCR_CONTROL] = PORT_SCR_CTL,
589 [SCR_ERROR] = PORT_SCR_ERR,
590 [SCR_ACTIVE] = PORT_SCR_ACT,
591 [SCR_NOTIFICATION] = PORT_SCR_NTF,
592 };
593 struct ahci_host_priv *hpriv = ap->host->private_data;
594
595 if (sc_reg < ARRAY_SIZE(offset) &&
596 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
597 return offset[sc_reg];
598 return 0;
599 }
600
601 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
602 {
603 void __iomem *port_mmio = ahci_port_base(link->ap);
604 int offset = ahci_scr_offset(link->ap, sc_reg);
605
606 if (offset) {
607 *val = readl(port_mmio + offset);
608 return 0;
609 }
610 return -EINVAL;
611 }
612
613 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
614 {
615 void __iomem *port_mmio = ahci_port_base(link->ap);
616 int offset = ahci_scr_offset(link->ap, sc_reg);
617
618 if (offset) {
619 writel(val, port_mmio + offset);
620 return 0;
621 }
622 return -EINVAL;
623 }
624
625 void ahci_start_engine(struct ata_port *ap)
626 {
627 void __iomem *port_mmio = ahci_port_base(ap);
628 u32 tmp;
629
630 /* start DMA */
631 tmp = readl(port_mmio + PORT_CMD);
632 tmp |= PORT_CMD_START;
633 writel(tmp, port_mmio + PORT_CMD);
634 readl(port_mmio + PORT_CMD); /* flush */
635 }
636 EXPORT_SYMBOL_GPL(ahci_start_engine);
637
638 int ahci_stop_engine(struct ata_port *ap)
639 {
640 void __iomem *port_mmio = ahci_port_base(ap);
641 struct ahci_host_priv *hpriv = ap->host->private_data;
642 u32 tmp;
643
644 /*
645 * On some controllers, stopping a port's DMA engine while the port
646 * is in ALPM state (partial or slumber) results in failures on
647 * subsequent DMA engine starts. For those controllers, put the
648 * port back in active state before stopping its DMA engine.
649 */
650 if ((hpriv->flags & AHCI_HFLAG_WAKE_BEFORE_STOP) &&
651 (ap->link.lpm_policy > ATA_LPM_MAX_POWER) &&
652 ahci_set_lpm(&ap->link, ATA_LPM_MAX_POWER, ATA_LPM_WAKE_ONLY)) {
653 dev_err(ap->host->dev, "Failed to wake up port before engine stop\n");
654 return -EIO;
655 }
656
657 tmp = readl(port_mmio + PORT_CMD);
658
659 /* check if the HBA is idle */
660 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
661 return 0;
662
663 /* setting HBA to idle */
664 tmp &= ~PORT_CMD_START;
665 writel(tmp, port_mmio + PORT_CMD);
666
667 /* wait for engine to stop. This could be as long as 500 msec */
668 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
669 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
670 if (tmp & PORT_CMD_LIST_ON)
671 return -EIO;
672
673 return 0;
674 }
675 EXPORT_SYMBOL_GPL(ahci_stop_engine);
676
677 void ahci_start_fis_rx(struct ata_port *ap)
678 {
679 void __iomem *port_mmio = ahci_port_base(ap);
680 struct ahci_host_priv *hpriv = ap->host->private_data;
681 struct ahci_port_priv *pp = ap->private_data;
682 u32 tmp;
683
684 /* set FIS registers */
685 if (hpriv->cap & HOST_CAP_64)
686 writel((pp->cmd_slot_dma >> 16) >> 16,
687 port_mmio + PORT_LST_ADDR_HI);
688 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
689
690 if (hpriv->cap & HOST_CAP_64)
691 writel((pp->rx_fis_dma >> 16) >> 16,
692 port_mmio + PORT_FIS_ADDR_HI);
693 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
694
695 /* enable FIS reception */
696 tmp = readl(port_mmio + PORT_CMD);
697 tmp |= PORT_CMD_FIS_RX;
698 writel(tmp, port_mmio + PORT_CMD);
699
700 /* flush */
701 readl(port_mmio + PORT_CMD);
702 }
703 EXPORT_SYMBOL_GPL(ahci_start_fis_rx);
704
705 static int ahci_stop_fis_rx(struct ata_port *ap)
706 {
707 void __iomem *port_mmio = ahci_port_base(ap);
708 u32 tmp;
709
710 /* disable FIS reception */
711 tmp = readl(port_mmio + PORT_CMD);
712 tmp &= ~PORT_CMD_FIS_RX;
713 writel(tmp, port_mmio + PORT_CMD);
714
715 /* wait for completion, spec says 500ms, give it 1000 */
716 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
717 PORT_CMD_FIS_ON, 10, 1000);
718 if (tmp & PORT_CMD_FIS_ON)
719 return -EBUSY;
720
721 return 0;
722 }
723
724 static void ahci_power_up(struct ata_port *ap)
725 {
726 struct ahci_host_priv *hpriv = ap->host->private_data;
727 void __iomem *port_mmio = ahci_port_base(ap);
728 u32 cmd;
729
730 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
731
732 /* spin up device */
733 if (hpriv->cap & HOST_CAP_SSS) {
734 cmd |= PORT_CMD_SPIN_UP;
735 writel(cmd, port_mmio + PORT_CMD);
736 }
737
738 /* wake up link */
739 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
740 }
741
742 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
743 unsigned int hints)
744 {
745 struct ata_port *ap = link->ap;
746 struct ahci_host_priv *hpriv = ap->host->private_data;
747 struct ahci_port_priv *pp = ap->private_data;
748 void __iomem *port_mmio = ahci_port_base(ap);
749
750 if (policy != ATA_LPM_MAX_POWER) {
751 /* wakeup flag only applies to the max power policy */
752 hints &= ~ATA_LPM_WAKE_ONLY;
753
754 /*
755 * Disable interrupts on Phy Ready. This keeps us from
756 * getting woken up due to spurious phy ready
757 * interrupts.
758 */
759 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
760 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
761
762 sata_link_scr_lpm(link, policy, false);
763 }
764
765 if (hpriv->cap & HOST_CAP_ALPM) {
766 u32 cmd = readl(port_mmio + PORT_CMD);
767
768 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
769 if (!(hints & ATA_LPM_WAKE_ONLY))
770 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
771 cmd |= PORT_CMD_ICC_ACTIVE;
772
773 writel(cmd, port_mmio + PORT_CMD);
774 readl(port_mmio + PORT_CMD);
775
776 /* wait 10ms to be sure we've come out of LPM state */
777 ata_msleep(ap, 10);
778
779 if (hints & ATA_LPM_WAKE_ONLY)
780 return 0;
781 } else {
782 cmd |= PORT_CMD_ALPE;
783 if (policy == ATA_LPM_MIN_POWER)
784 cmd |= PORT_CMD_ASP;
785
786 /* write out new cmd value */
787 writel(cmd, port_mmio + PORT_CMD);
788 }
789 }
790
791 /* set aggressive device sleep */
792 if ((hpriv->cap2 & HOST_CAP2_SDS) &&
793 (hpriv->cap2 & HOST_CAP2_SADM) &&
794 (link->device->flags & ATA_DFLAG_DEVSLP)) {
795 if (policy == ATA_LPM_MIN_POWER)
796 ahci_set_aggressive_devslp(ap, true);
797 else
798 ahci_set_aggressive_devslp(ap, false);
799 }
800
801 if (policy == ATA_LPM_MAX_POWER) {
802 sata_link_scr_lpm(link, policy, false);
803
804 /* turn PHYRDY IRQ back on */
805 pp->intr_mask |= PORT_IRQ_PHYRDY;
806 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
807 }
808
809 return 0;
810 }
811
812 #ifdef CONFIG_PM
813 static void ahci_power_down(struct ata_port *ap)
814 {
815 struct ahci_host_priv *hpriv = ap->host->private_data;
816 void __iomem *port_mmio = ahci_port_base(ap);
817 u32 cmd, scontrol;
818
819 if (!(hpriv->cap & HOST_CAP_SSS))
820 return;
821
822 /* put device into listen mode, first set PxSCTL.DET to 0 */
823 scontrol = readl(port_mmio + PORT_SCR_CTL);
824 scontrol &= ~0xf;
825 writel(scontrol, port_mmio + PORT_SCR_CTL);
826
827 /* then set PxCMD.SUD to 0 */
828 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
829 cmd &= ~PORT_CMD_SPIN_UP;
830 writel(cmd, port_mmio + PORT_CMD);
831 }
832 #endif
833
834 static void ahci_start_port(struct ata_port *ap)
835 {
836 struct ahci_host_priv *hpriv = ap->host->private_data;
837 struct ahci_port_priv *pp = ap->private_data;
838 struct ata_link *link;
839 struct ahci_em_priv *emp;
840 ssize_t rc;
841 int i;
842
843 /* enable FIS reception */
844 ahci_start_fis_rx(ap);
845
846 /* enable DMA */
847 if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
848 hpriv->start_engine(ap);
849
850 /* turn on LEDs */
851 if (ap->flags & ATA_FLAG_EM) {
852 ata_for_each_link(link, ap, EDGE) {
853 emp = &pp->em_priv[link->pmp];
854
855 /* EM Transmit bit maybe busy during init */
856 for (i = 0; i < EM_MAX_RETRY; i++) {
857 rc = ap->ops->transmit_led_message(ap,
858 emp->led_state,
859 4);
860 /*
861 * If busy, give a breather but do not
862 * release EH ownership by using msleep()
863 * instead of ata_msleep(). EM Transmit
864 * bit is busy for the whole host and
865 * releasing ownership will cause other
866 * ports to fail the same way.
867 */
868 if (rc == -EBUSY)
869 msleep(1);
870 else
871 break;
872 }
873 }
874 }
875
876 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
877 ata_for_each_link(link, ap, EDGE)
878 ahci_init_sw_activity(link);
879
880 }
881
882 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
883 {
884 int rc;
885
886 /* disable DMA */
887 rc = ahci_stop_engine(ap);
888 if (rc) {
889 *emsg = "failed to stop engine";
890 return rc;
891 }
892
893 /* disable FIS reception */
894 rc = ahci_stop_fis_rx(ap);
895 if (rc) {
896 *emsg = "failed stop FIS RX";
897 return rc;
898 }
899
900 return 0;
901 }
902
903 int ahci_reset_controller(struct ata_host *host)
904 {
905 struct ahci_host_priv *hpriv = host->private_data;
906 void __iomem *mmio = hpriv->mmio;
907 u32 tmp;
908
909 /* we must be in AHCI mode, before using anything
910 * AHCI-specific, such as HOST_RESET.
911 */
912 ahci_enable_ahci(mmio);
913
914 /* global controller reset */
915 if (!ahci_skip_host_reset) {
916 tmp = readl(mmio + HOST_CTL);
917 if ((tmp & HOST_RESET) == 0) {
918 writel(tmp | HOST_RESET, mmio + HOST_CTL);
919 readl(mmio + HOST_CTL); /* flush */
920 }
921
922 /*
923 * to perform host reset, OS should set HOST_RESET
924 * and poll until this bit is read to be "0".
925 * reset must complete within 1 second, or
926 * the hardware should be considered fried.
927 */
928 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
929 HOST_RESET, 10, 1000);
930
931 if (tmp & HOST_RESET) {
932 dev_err(host->dev, "controller reset failed (0x%x)\n",
933 tmp);
934 return -EIO;
935 }
936
937 /* turn on AHCI mode */
938 ahci_enable_ahci(mmio);
939
940 /* Some registers might be cleared on reset. Restore
941 * initial values.
942 */
943 ahci_restore_initial_config(host);
944 } else
945 dev_info(host->dev, "skipping global host reset\n");
946
947 return 0;
948 }
949 EXPORT_SYMBOL_GPL(ahci_reset_controller);
950
951 static void ahci_sw_activity(struct ata_link *link)
952 {
953 struct ata_port *ap = link->ap;
954 struct ahci_port_priv *pp = ap->private_data;
955 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
956
957 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
958 return;
959
960 emp->activity++;
961 if (!timer_pending(&emp->timer))
962 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
963 }
964
965 static void ahci_sw_activity_blink(unsigned long arg)
966 {
967 struct ata_link *link = (struct ata_link *)arg;
968 struct ata_port *ap = link->ap;
969 struct ahci_port_priv *pp = ap->private_data;
970 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
971 unsigned long led_message = emp->led_state;
972 u32 activity_led_state;
973 unsigned long flags;
974
975 led_message &= EM_MSG_LED_VALUE;
976 led_message |= ap->port_no | (link->pmp << 8);
977
978 /* check to see if we've had activity. If so,
979 * toggle state of LED and reset timer. If not,
980 * turn LED to desired idle state.
981 */
982 spin_lock_irqsave(ap->lock, flags);
983 if (emp->saved_activity != emp->activity) {
984 emp->saved_activity = emp->activity;
985 /* get the current LED state */
986 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
987
988 if (activity_led_state)
989 activity_led_state = 0;
990 else
991 activity_led_state = 1;
992
993 /* clear old state */
994 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
995
996 /* toggle state */
997 led_message |= (activity_led_state << 16);
998 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
999 } else {
1000 /* switch to idle */
1001 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
1002 if (emp->blink_policy == BLINK_OFF)
1003 led_message |= (1 << 16);
1004 }
1005 spin_unlock_irqrestore(ap->lock, flags);
1006 ap->ops->transmit_led_message(ap, led_message, 4);
1007 }
1008
1009 static void ahci_init_sw_activity(struct ata_link *link)
1010 {
1011 struct ata_port *ap = link->ap;
1012 struct ahci_port_priv *pp = ap->private_data;
1013 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1014
1015 /* init activity stats, setup timer */
1016 emp->saved_activity = emp->activity = 0;
1017 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
1018
1019 /* check our blink policy and set flag for link if it's enabled */
1020 if (emp->blink_policy)
1021 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1022 }
1023
1024 int ahci_reset_em(struct ata_host *host)
1025 {
1026 struct ahci_host_priv *hpriv = host->private_data;
1027 void __iomem *mmio = hpriv->mmio;
1028 u32 em_ctl;
1029
1030 em_ctl = readl(mmio + HOST_EM_CTL);
1031 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
1032 return -EINVAL;
1033
1034 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
1035 return 0;
1036 }
1037 EXPORT_SYMBOL_GPL(ahci_reset_em);
1038
1039 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
1040 ssize_t size)
1041 {
1042 struct ahci_host_priv *hpriv = ap->host->private_data;
1043 struct ahci_port_priv *pp = ap->private_data;
1044 void __iomem *mmio = hpriv->mmio;
1045 u32 em_ctl;
1046 u32 message[] = {0, 0};
1047 unsigned long flags;
1048 int pmp;
1049 struct ahci_em_priv *emp;
1050
1051 /* get the slot number from the message */
1052 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1053 if (pmp < EM_MAX_SLOTS)
1054 emp = &pp->em_priv[pmp];
1055 else
1056 return -EINVAL;
1057
1058 ahci_rpm_get_port(ap);
1059 spin_lock_irqsave(ap->lock, flags);
1060
1061 /*
1062 * if we are still busy transmitting a previous message,
1063 * do not allow
1064 */
1065 em_ctl = readl(mmio + HOST_EM_CTL);
1066 if (em_ctl & EM_CTL_TM) {
1067 spin_unlock_irqrestore(ap->lock, flags);
1068 ahci_rpm_put_port(ap);
1069 return -EBUSY;
1070 }
1071
1072 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
1073 /*
1074 * create message header - this is all zero except for
1075 * the message size, which is 4 bytes.
1076 */
1077 message[0] |= (4 << 8);
1078
1079 /* ignore 0:4 of byte zero, fill in port info yourself */
1080 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
1081
1082 /* write message to EM_LOC */
1083 writel(message[0], mmio + hpriv->em_loc);
1084 writel(message[1], mmio + hpriv->em_loc+4);
1085
1086 /*
1087 * tell hardware to transmit the message
1088 */
1089 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1090 }
1091
1092 /* save off new led state for port/slot */
1093 emp->led_state = state;
1094
1095 spin_unlock_irqrestore(ap->lock, flags);
1096 ahci_rpm_put_port(ap);
1097
1098 return size;
1099 }
1100
1101 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1102 {
1103 struct ahci_port_priv *pp = ap->private_data;
1104 struct ata_link *link;
1105 struct ahci_em_priv *emp;
1106 int rc = 0;
1107
1108 ata_for_each_link(link, ap, EDGE) {
1109 emp = &pp->em_priv[link->pmp];
1110 rc += sprintf(buf, "%lx\n", emp->led_state);
1111 }
1112 return rc;
1113 }
1114
1115 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1116 size_t size)
1117 {
1118 unsigned int state;
1119 int pmp;
1120 struct ahci_port_priv *pp = ap->private_data;
1121 struct ahci_em_priv *emp;
1122
1123 if (kstrtouint(buf, 0, &state) < 0)
1124 return -EINVAL;
1125
1126 /* get the slot number from the message */
1127 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1128 if (pmp < EM_MAX_SLOTS)
1129 emp = &pp->em_priv[pmp];
1130 else
1131 return -EINVAL;
1132
1133 /* mask off the activity bits if we are in sw_activity
1134 * mode, user should turn off sw_activity before setting
1135 * activity led through em_message
1136 */
1137 if (emp->blink_policy)
1138 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1139
1140 return ap->ops->transmit_led_message(ap, state, size);
1141 }
1142
1143 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1144 {
1145 struct ata_link *link = dev->link;
1146 struct ata_port *ap = link->ap;
1147 struct ahci_port_priv *pp = ap->private_data;
1148 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1149 u32 port_led_state = emp->led_state;
1150
1151 /* save the desired Activity LED behavior */
1152 if (val == OFF) {
1153 /* clear LFLAG */
1154 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1155
1156 /* set the LED to OFF */
1157 port_led_state &= EM_MSG_LED_VALUE_OFF;
1158 port_led_state |= (ap->port_no | (link->pmp << 8));
1159 ap->ops->transmit_led_message(ap, port_led_state, 4);
1160 } else {
1161 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1162 if (val == BLINK_OFF) {
1163 /* set LED to ON for idle */
1164 port_led_state &= EM_MSG_LED_VALUE_OFF;
1165 port_led_state |= (ap->port_no | (link->pmp << 8));
1166 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1167 ap->ops->transmit_led_message(ap, port_led_state, 4);
1168 }
1169 }
1170 emp->blink_policy = val;
1171 return 0;
1172 }
1173
1174 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1175 {
1176 struct ata_link *link = dev->link;
1177 struct ata_port *ap = link->ap;
1178 struct ahci_port_priv *pp = ap->private_data;
1179 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1180
1181 /* display the saved value of activity behavior for this
1182 * disk.
1183 */
1184 return sprintf(buf, "%d\n", emp->blink_policy);
1185 }
1186
1187 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1188 int port_no, void __iomem *mmio,
1189 void __iomem *port_mmio)
1190 {
1191 struct ahci_host_priv *hpriv = ap->host->private_data;
1192 const char *emsg = NULL;
1193 int rc;
1194 u32 tmp;
1195
1196 /* make sure port is not active */
1197 rc = ahci_deinit_port(ap, &emsg);
1198 if (rc)
1199 dev_warn(dev, "%s (%d)\n", emsg, rc);
1200
1201 /* clear SError */
1202 tmp = readl(port_mmio + PORT_SCR_ERR);
1203 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1204 writel(tmp, port_mmio + PORT_SCR_ERR);
1205
1206 /* clear port IRQ */
1207 tmp = readl(port_mmio + PORT_IRQ_STAT);
1208 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1209 if (tmp)
1210 writel(tmp, port_mmio + PORT_IRQ_STAT);
1211
1212 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1213
1214 /* mark esata ports */
1215 tmp = readl(port_mmio + PORT_CMD);
1216 if ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS))
1217 ap->pflags |= ATA_PFLAG_EXTERNAL;
1218 }
1219
1220 void ahci_init_controller(struct ata_host *host)
1221 {
1222 struct ahci_host_priv *hpriv = host->private_data;
1223 void __iomem *mmio = hpriv->mmio;
1224 int i;
1225 void __iomem *port_mmio;
1226 u32 tmp;
1227
1228 for (i = 0; i < host->n_ports; i++) {
1229 struct ata_port *ap = host->ports[i];
1230
1231 port_mmio = ahci_port_base(ap);
1232 if (ata_port_is_dummy(ap))
1233 continue;
1234
1235 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1236 }
1237
1238 tmp = readl(mmio + HOST_CTL);
1239 VPRINTK("HOST_CTL 0x%x\n", tmp);
1240 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1241 tmp = readl(mmio + HOST_CTL);
1242 VPRINTK("HOST_CTL 0x%x\n", tmp);
1243 }
1244 EXPORT_SYMBOL_GPL(ahci_init_controller);
1245
1246 static void ahci_dev_config(struct ata_device *dev)
1247 {
1248 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1249
1250 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1251 dev->max_sectors = 255;
1252 ata_dev_info(dev,
1253 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1254 }
1255 }
1256
1257 unsigned int ahci_dev_classify(struct ata_port *ap)
1258 {
1259 void __iomem *port_mmio = ahci_port_base(ap);
1260 struct ata_taskfile tf;
1261 u32 tmp;
1262
1263 tmp = readl(port_mmio + PORT_SIG);
1264 tf.lbah = (tmp >> 24) & 0xff;
1265 tf.lbam = (tmp >> 16) & 0xff;
1266 tf.lbal = (tmp >> 8) & 0xff;
1267 tf.nsect = (tmp) & 0xff;
1268
1269 return ata_dev_classify(&tf);
1270 }
1271 EXPORT_SYMBOL_GPL(ahci_dev_classify);
1272
1273 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1274 u32 opts)
1275 {
1276 dma_addr_t cmd_tbl_dma;
1277
1278 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1279
1280 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1281 pp->cmd_slot[tag].status = 0;
1282 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1283 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1284 }
1285 EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1286
1287 int ahci_kick_engine(struct ata_port *ap)
1288 {
1289 void __iomem *port_mmio = ahci_port_base(ap);
1290 struct ahci_host_priv *hpriv = ap->host->private_data;
1291 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1292 u32 tmp;
1293 int busy, rc;
1294
1295 /* stop engine */
1296 rc = ahci_stop_engine(ap);
1297 if (rc)
1298 goto out_restart;
1299
1300 /* need to do CLO?
1301 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1302 */
1303 busy = status & (ATA_BUSY | ATA_DRQ);
1304 if (!busy && !sata_pmp_attached(ap)) {
1305 rc = 0;
1306 goto out_restart;
1307 }
1308
1309 if (!(hpriv->cap & HOST_CAP_CLO)) {
1310 rc = -EOPNOTSUPP;
1311 goto out_restart;
1312 }
1313
1314 /* perform CLO */
1315 tmp = readl(port_mmio + PORT_CMD);
1316 tmp |= PORT_CMD_CLO;
1317 writel(tmp, port_mmio + PORT_CMD);
1318
1319 rc = 0;
1320 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1321 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1322 if (tmp & PORT_CMD_CLO)
1323 rc = -EIO;
1324
1325 /* restart engine */
1326 out_restart:
1327 hpriv->start_engine(ap);
1328 return rc;
1329 }
1330 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1331
1332 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1333 struct ata_taskfile *tf, int is_cmd, u16 flags,
1334 unsigned long timeout_msec)
1335 {
1336 const u32 cmd_fis_len = 5; /* five dwords */
1337 struct ahci_port_priv *pp = ap->private_data;
1338 void __iomem *port_mmio = ahci_port_base(ap);
1339 u8 *fis = pp->cmd_tbl;
1340 u32 tmp;
1341
1342 /* prep the command */
1343 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1344 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1345
1346 /* set port value for softreset of Port Multiplier */
1347 if (pp->fbs_enabled && pp->fbs_last_dev != pmp) {
1348 tmp = readl(port_mmio + PORT_FBS);
1349 tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1350 tmp |= pmp << PORT_FBS_DEV_OFFSET;
1351 writel(tmp, port_mmio + PORT_FBS);
1352 pp->fbs_last_dev = pmp;
1353 }
1354
1355 /* issue & wait */
1356 writel(1, port_mmio + PORT_CMD_ISSUE);
1357
1358 if (timeout_msec) {
1359 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1360 0x1, 0x1, 1, timeout_msec);
1361 if (tmp & 0x1) {
1362 ahci_kick_engine(ap);
1363 return -EBUSY;
1364 }
1365 } else
1366 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1367
1368 return 0;
1369 }
1370
1371 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1372 int pmp, unsigned long deadline,
1373 int (*check_ready)(struct ata_link *link))
1374 {
1375 struct ata_port *ap = link->ap;
1376 struct ahci_host_priv *hpriv = ap->host->private_data;
1377 struct ahci_port_priv *pp = ap->private_data;
1378 const char *reason = NULL;
1379 unsigned long now, msecs;
1380 struct ata_taskfile tf;
1381 bool fbs_disabled = false;
1382 int rc;
1383
1384 DPRINTK("ENTER\n");
1385
1386 /* prepare for SRST (AHCI-1.1 10.4.1) */
1387 rc = ahci_kick_engine(ap);
1388 if (rc && rc != -EOPNOTSUPP)
1389 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1390
1391 /*
1392 * According to AHCI-1.2 9.3.9: if FBS is enable, software shall
1393 * clear PxFBS.EN to '0' prior to issuing software reset to devices
1394 * that is attached to port multiplier.
1395 */
1396 if (!ata_is_host_link(link) && pp->fbs_enabled) {
1397 ahci_disable_fbs(ap);
1398 fbs_disabled = true;
1399 }
1400
1401 ata_tf_init(link->device, &tf);
1402
1403 /* issue the first D2H Register FIS */
1404 msecs = 0;
1405 now = jiffies;
1406 if (time_after(deadline, now))
1407 msecs = jiffies_to_msecs(deadline - now);
1408
1409 tf.ctl |= ATA_SRST;
1410 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1411 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1412 rc = -EIO;
1413 reason = "1st FIS failed";
1414 goto fail;
1415 }
1416
1417 /* spec says at least 5us, but be generous and sleep for 1ms */
1418 ata_msleep(ap, 1);
1419
1420 /* issue the second D2H Register FIS */
1421 tf.ctl &= ~ATA_SRST;
1422 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1423
1424 /* wait for link to become ready */
1425 rc = ata_wait_after_reset(link, deadline, check_ready);
1426 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1427 /*
1428 * Workaround for cases where link online status can't
1429 * be trusted. Treat device readiness timeout as link
1430 * offline.
1431 */
1432 ata_link_info(link, "device not ready, treating as offline\n");
1433 *class = ATA_DEV_NONE;
1434 } else if (rc) {
1435 /* link occupied, -ENODEV too is an error */
1436 reason = "device not ready";
1437 goto fail;
1438 } else
1439 *class = ahci_dev_classify(ap);
1440
1441 /* re-enable FBS if disabled before */
1442 if (fbs_disabled)
1443 ahci_enable_fbs(ap);
1444
1445 DPRINTK("EXIT, class=%u\n", *class);
1446 return 0;
1447
1448 fail:
1449 ata_link_err(link, "softreset failed (%s)\n", reason);
1450 return rc;
1451 }
1452
1453 int ahci_check_ready(struct ata_link *link)
1454 {
1455 void __iomem *port_mmio = ahci_port_base(link->ap);
1456 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1457
1458 return ata_check_ready(status);
1459 }
1460 EXPORT_SYMBOL_GPL(ahci_check_ready);
1461
1462 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1463 unsigned long deadline)
1464 {
1465 int pmp = sata_srst_pmp(link);
1466
1467 DPRINTK("ENTER\n");
1468
1469 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1470 }
1471 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1472
1473 static int ahci_bad_pmp_check_ready(struct ata_link *link)
1474 {
1475 void __iomem *port_mmio = ahci_port_base(link->ap);
1476 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1477 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1478
1479 /*
1480 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1481 * which can save timeout delay.
1482 */
1483 if (irq_status & PORT_IRQ_BAD_PMP)
1484 return -EIO;
1485
1486 return ata_check_ready(status);
1487 }
1488
1489 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1490 unsigned long deadline)
1491 {
1492 struct ata_port *ap = link->ap;
1493 void __iomem *port_mmio = ahci_port_base(ap);
1494 int pmp = sata_srst_pmp(link);
1495 int rc;
1496 u32 irq_sts;
1497
1498 DPRINTK("ENTER\n");
1499
1500 rc = ahci_do_softreset(link, class, pmp, deadline,
1501 ahci_bad_pmp_check_ready);
1502
1503 /*
1504 * Soft reset fails with IPMS set when PMP is enabled but
1505 * SATA HDD/ODD is connected to SATA port, do soft reset
1506 * again to port 0.
1507 */
1508 if (rc == -EIO) {
1509 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1510 if (irq_sts & PORT_IRQ_BAD_PMP) {
1511 ata_link_warn(link,
1512 "applying PMP SRST workaround "
1513 "and retrying\n");
1514 rc = ahci_do_softreset(link, class, 0, deadline,
1515 ahci_check_ready);
1516 }
1517 }
1518
1519 return rc;
1520 }
1521
1522 int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
1523 unsigned long deadline, bool *online)
1524 {
1525 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1526 struct ata_port *ap = link->ap;
1527 struct ahci_port_priv *pp = ap->private_data;
1528 struct ahci_host_priv *hpriv = ap->host->private_data;
1529 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1530 struct ata_taskfile tf;
1531 int rc;
1532
1533 DPRINTK("ENTER\n");
1534
1535 ahci_stop_engine(ap);
1536
1537 /* clear D2H reception area to properly wait for D2H FIS */
1538 ata_tf_init(link->device, &tf);
1539 tf.command = ATA_BUSY;
1540 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1541
1542 rc = sata_link_hardreset(link, timing, deadline, online,
1543 ahci_check_ready);
1544
1545 hpriv->start_engine(ap);
1546
1547 if (*online)
1548 *class = ahci_dev_classify(ap);
1549
1550 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1551 return rc;
1552 }
1553 EXPORT_SYMBOL_GPL(ahci_do_hardreset);
1554
1555 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1556 unsigned long deadline)
1557 {
1558 bool online;
1559
1560 return ahci_do_hardreset(link, class, deadline, &online);
1561 }
1562
1563 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1564 {
1565 struct ata_port *ap = link->ap;
1566 void __iomem *port_mmio = ahci_port_base(ap);
1567 u32 new_tmp, tmp;
1568
1569 ata_std_postreset(link, class);
1570
1571 /* Make sure port's ATAPI bit is set appropriately */
1572 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1573 if (*class == ATA_DEV_ATAPI)
1574 new_tmp |= PORT_CMD_ATAPI;
1575 else
1576 new_tmp &= ~PORT_CMD_ATAPI;
1577 if (new_tmp != tmp) {
1578 writel(new_tmp, port_mmio + PORT_CMD);
1579 readl(port_mmio + PORT_CMD); /* flush */
1580 }
1581 }
1582
1583 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1584 {
1585 struct scatterlist *sg;
1586 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1587 unsigned int si;
1588
1589 VPRINTK("ENTER\n");
1590
1591 /*
1592 * Next, the S/G list.
1593 */
1594 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1595 dma_addr_t addr = sg_dma_address(sg);
1596 u32 sg_len = sg_dma_len(sg);
1597
1598 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1599 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1600 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1601 }
1602
1603 return si;
1604 }
1605
1606 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1607 {
1608 struct ata_port *ap = qc->ap;
1609 struct ahci_port_priv *pp = ap->private_data;
1610
1611 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1612 return ata_std_qc_defer(qc);
1613 else
1614 return sata_pmp_qc_defer_cmd_switch(qc);
1615 }
1616
1617 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1618 {
1619 struct ata_port *ap = qc->ap;
1620 struct ahci_port_priv *pp = ap->private_data;
1621 int is_atapi = ata_is_atapi(qc->tf.protocol);
1622 void *cmd_tbl;
1623 u32 opts;
1624 const u32 cmd_fis_len = 5; /* five dwords */
1625 unsigned int n_elem;
1626
1627 /*
1628 * Fill in command table information. First, the header,
1629 * a SATA Register - Host to Device command FIS.
1630 */
1631 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1632
1633 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1634 if (is_atapi) {
1635 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1636 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1637 }
1638
1639 n_elem = 0;
1640 if (qc->flags & ATA_QCFLAG_DMAMAP)
1641 n_elem = ahci_fill_sg(qc, cmd_tbl);
1642
1643 /*
1644 * Fill in command slot information.
1645 */
1646 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1647 if (qc->tf.flags & ATA_TFLAG_WRITE)
1648 opts |= AHCI_CMD_WRITE;
1649 if (is_atapi)
1650 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1651
1652 ahci_fill_cmd_slot(pp, qc->tag, opts);
1653 }
1654
1655 static void ahci_fbs_dec_intr(struct ata_port *ap)
1656 {
1657 struct ahci_port_priv *pp = ap->private_data;
1658 void __iomem *port_mmio = ahci_port_base(ap);
1659 u32 fbs = readl(port_mmio + PORT_FBS);
1660 int retries = 3;
1661
1662 DPRINTK("ENTER\n");
1663 BUG_ON(!pp->fbs_enabled);
1664
1665 /* time to wait for DEC is not specified by AHCI spec,
1666 * add a retry loop for safety.
1667 */
1668 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1669 fbs = readl(port_mmio + PORT_FBS);
1670 while ((fbs & PORT_FBS_DEC) && retries--) {
1671 udelay(1);
1672 fbs = readl(port_mmio + PORT_FBS);
1673 }
1674
1675 if (fbs & PORT_FBS_DEC)
1676 dev_err(ap->host->dev, "failed to clear device error\n");
1677 }
1678
1679 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1680 {
1681 struct ahci_host_priv *hpriv = ap->host->private_data;
1682 struct ahci_port_priv *pp = ap->private_data;
1683 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1684 struct ata_link *link = NULL;
1685 struct ata_queued_cmd *active_qc;
1686 struct ata_eh_info *active_ehi;
1687 bool fbs_need_dec = false;
1688 u32 serror;
1689
1690 /* determine active link with error */
1691 if (pp->fbs_enabled) {
1692 void __iomem *port_mmio = ahci_port_base(ap);
1693 u32 fbs = readl(port_mmio + PORT_FBS);
1694 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1695
1696 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
1697 link = &ap->pmp_link[pmp];
1698 fbs_need_dec = true;
1699 }
1700
1701 } else
1702 ata_for_each_link(link, ap, EDGE)
1703 if (ata_link_active(link))
1704 break;
1705
1706 if (!link)
1707 link = &ap->link;
1708
1709 active_qc = ata_qc_from_tag(ap, link->active_tag);
1710 active_ehi = &link->eh_info;
1711
1712 /* record irq stat */
1713 ata_ehi_clear_desc(host_ehi);
1714 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1715
1716 /* AHCI needs SError cleared; otherwise, it might lock up */
1717 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1718 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1719 host_ehi->serror |= serror;
1720
1721 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1722 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1723 irq_stat &= ~PORT_IRQ_IF_ERR;
1724
1725 if (irq_stat & PORT_IRQ_TF_ERR) {
1726 /* If qc is active, charge it; otherwise, the active
1727 * link. There's no active qc on NCQ errors. It will
1728 * be determined by EH by reading log page 10h.
1729 */
1730 if (active_qc)
1731 active_qc->err_mask |= AC_ERR_DEV;
1732 else
1733 active_ehi->err_mask |= AC_ERR_DEV;
1734
1735 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1736 host_ehi->serror &= ~SERR_INTERNAL;
1737 }
1738
1739 if (irq_stat & PORT_IRQ_UNK_FIS) {
1740 u32 *unk = pp->rx_fis + RX_FIS_UNK;
1741
1742 active_ehi->err_mask |= AC_ERR_HSM;
1743 active_ehi->action |= ATA_EH_RESET;
1744 ata_ehi_push_desc(active_ehi,
1745 "unknown FIS %08x %08x %08x %08x" ,
1746 unk[0], unk[1], unk[2], unk[3]);
1747 }
1748
1749 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1750 active_ehi->err_mask |= AC_ERR_HSM;
1751 active_ehi->action |= ATA_EH_RESET;
1752 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1753 }
1754
1755 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1756 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1757 host_ehi->action |= ATA_EH_RESET;
1758 ata_ehi_push_desc(host_ehi, "host bus error");
1759 }
1760
1761 if (irq_stat & PORT_IRQ_IF_ERR) {
1762 if (fbs_need_dec)
1763 active_ehi->err_mask |= AC_ERR_DEV;
1764 else {
1765 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1766 host_ehi->action |= ATA_EH_RESET;
1767 }
1768
1769 ata_ehi_push_desc(host_ehi, "interface fatal error");
1770 }
1771
1772 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1773 ata_ehi_hotplugged(host_ehi);
1774 ata_ehi_push_desc(host_ehi, "%s",
1775 irq_stat & PORT_IRQ_CONNECT ?
1776 "connection status changed" : "PHY RDY changed");
1777 }
1778
1779 /* okay, let's hand over to EH */
1780
1781 if (irq_stat & PORT_IRQ_FREEZE)
1782 ata_port_freeze(ap);
1783 else if (fbs_need_dec) {
1784 ata_link_abort(link);
1785 ahci_fbs_dec_intr(ap);
1786 } else
1787 ata_port_abort(ap);
1788 }
1789
1790 static void ahci_handle_port_interrupt(struct ata_port *ap,
1791 void __iomem *port_mmio, u32 status)
1792 {
1793 struct ata_eh_info *ehi = &ap->link.eh_info;
1794 struct ahci_port_priv *pp = ap->private_data;
1795 struct ahci_host_priv *hpriv = ap->host->private_data;
1796 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1797 u32 qc_active = 0;
1798 int rc;
1799
1800 /* ignore BAD_PMP while resetting */
1801 if (unlikely(resetting))
1802 status &= ~PORT_IRQ_BAD_PMP;
1803
1804 if (sata_lpm_ignore_phy_events(&ap->link)) {
1805 status &= ~PORT_IRQ_PHYRDY;
1806 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1807 }
1808
1809 if (unlikely(status & PORT_IRQ_ERROR)) {
1810 ahci_error_intr(ap, status);
1811 return;
1812 }
1813
1814 if (status & PORT_IRQ_SDB_FIS) {
1815 /* If SNotification is available, leave notification
1816 * handling to sata_async_notification(). If not,
1817 * emulate it by snooping SDB FIS RX area.
1818 *
1819 * Snooping FIS RX area is probably cheaper than
1820 * poking SNotification but some constrollers which
1821 * implement SNotification, ICH9 for example, don't
1822 * store AN SDB FIS into receive area.
1823 */
1824 if (hpriv->cap & HOST_CAP_SNTF)
1825 sata_async_notification(ap);
1826 else {
1827 /* If the 'N' bit in word 0 of the FIS is set,
1828 * we just received asynchronous notification.
1829 * Tell libata about it.
1830 *
1831 * Lack of SNotification should not appear in
1832 * ahci 1.2, so the workaround is unnecessary
1833 * when FBS is enabled.
1834 */
1835 if (pp->fbs_enabled)
1836 WARN_ON_ONCE(1);
1837 else {
1838 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1839 u32 f0 = le32_to_cpu(f[0]);
1840 if (f0 & (1 << 15))
1841 sata_async_notification(ap);
1842 }
1843 }
1844 }
1845
1846 /* pp->active_link is not reliable once FBS is enabled, both
1847 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1848 * NCQ and non-NCQ commands may be in flight at the same time.
1849 */
1850 if (pp->fbs_enabled) {
1851 if (ap->qc_active) {
1852 qc_active = readl(port_mmio + PORT_SCR_ACT);
1853 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1854 }
1855 } else {
1856 /* pp->active_link is valid iff any command is in flight */
1857 if (ap->qc_active && pp->active_link->sactive)
1858 qc_active = readl(port_mmio + PORT_SCR_ACT);
1859 else
1860 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1861 }
1862
1863
1864 rc = ata_qc_complete_multiple(ap, qc_active);
1865
1866 /* while resetting, invalid completions are expected */
1867 if (unlikely(rc < 0 && !resetting)) {
1868 ehi->err_mask |= AC_ERR_HSM;
1869 ehi->action |= ATA_EH_RESET;
1870 ata_port_freeze(ap);
1871 }
1872 }
1873
1874 static void ahci_port_intr(struct ata_port *ap)
1875 {
1876 void __iomem *port_mmio = ahci_port_base(ap);
1877 u32 status;
1878
1879 status = readl(port_mmio + PORT_IRQ_STAT);
1880 writel(status, port_mmio + PORT_IRQ_STAT);
1881
1882 ahci_handle_port_interrupt(ap, port_mmio, status);
1883 }
1884
1885 static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
1886 {
1887 struct ata_port *ap = dev_instance;
1888 void __iomem *port_mmio = ahci_port_base(ap);
1889 u32 status;
1890
1891 VPRINTK("ENTER\n");
1892
1893 status = readl(port_mmio + PORT_IRQ_STAT);
1894 writel(status, port_mmio + PORT_IRQ_STAT);
1895
1896 spin_lock(ap->lock);
1897 ahci_handle_port_interrupt(ap, port_mmio, status);
1898 spin_unlock(ap->lock);
1899
1900 VPRINTK("EXIT\n");
1901
1902 return IRQ_HANDLED;
1903 }
1904
1905 u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
1906 {
1907 unsigned int i, handled = 0;
1908
1909 for (i = 0; i < host->n_ports; i++) {
1910 struct ata_port *ap;
1911
1912 if (!(irq_masked & (1 << i)))
1913 continue;
1914
1915 ap = host->ports[i];
1916 if (ap) {
1917 ahci_port_intr(ap);
1918 VPRINTK("port %u\n", i);
1919 } else {
1920 VPRINTK("port %u (no irq)\n", i);
1921 if (ata_ratelimit())
1922 dev_warn(host->dev,
1923 "interrupt on disabled port %u\n", i);
1924 }
1925
1926 handled = 1;
1927 }
1928
1929 return handled;
1930 }
1931 EXPORT_SYMBOL_GPL(ahci_handle_port_intr);
1932
1933 static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
1934 {
1935 struct ata_host *host = dev_instance;
1936 struct ahci_host_priv *hpriv;
1937 unsigned int rc = 0;
1938 void __iomem *mmio;
1939 u32 irq_stat, irq_masked;
1940
1941 VPRINTK("ENTER\n");
1942
1943 hpriv = host->private_data;
1944 mmio = hpriv->mmio;
1945
1946 /* sigh. 0xffffffff is a valid return from h/w */
1947 irq_stat = readl(mmio + HOST_IRQ_STAT);
1948 if (!irq_stat)
1949 return IRQ_NONE;
1950
1951 irq_masked = irq_stat & hpriv->port_map;
1952
1953 spin_lock(&host->lock);
1954
1955 rc = ahci_handle_port_intr(host, irq_masked);
1956
1957 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1958 * it should be cleared after all the port events are cleared;
1959 * otherwise, it will raise a spurious interrupt after each
1960 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1961 * information.
1962 *
1963 * Also, use the unmasked value to clear interrupt as spurious
1964 * pending event on a dummy port might cause screaming IRQ.
1965 */
1966 writel(irq_stat, mmio + HOST_IRQ_STAT);
1967
1968 spin_unlock(&host->lock);
1969
1970 VPRINTK("EXIT\n");
1971
1972 return IRQ_RETVAL(rc);
1973 }
1974
1975 unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1976 {
1977 struct ata_port *ap = qc->ap;
1978 void __iomem *port_mmio = ahci_port_base(ap);
1979 struct ahci_port_priv *pp = ap->private_data;
1980
1981 /* Keep track of the currently active link. It will be used
1982 * in completion path to determine whether NCQ phase is in
1983 * progress.
1984 */
1985 pp->active_link = qc->dev->link;
1986
1987 if (ata_is_ncq(qc->tf.protocol))
1988 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1989
1990 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1991 u32 fbs = readl(port_mmio + PORT_FBS);
1992 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1993 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1994 writel(fbs, port_mmio + PORT_FBS);
1995 pp->fbs_last_dev = qc->dev->link->pmp;
1996 }
1997
1998 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1999
2000 ahci_sw_activity(qc->dev->link);
2001
2002 return 0;
2003 }
2004 EXPORT_SYMBOL_GPL(ahci_qc_issue);
2005
2006 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
2007 {
2008 struct ahci_port_priv *pp = qc->ap->private_data;
2009 u8 *rx_fis = pp->rx_fis;
2010
2011 if (pp->fbs_enabled)
2012 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
2013
2014 /*
2015 * After a successful execution of an ATA PIO data-in command,
2016 * the device doesn't send D2H Reg FIS to update the TF and
2017 * the host should take TF and E_Status from the preceding PIO
2018 * Setup FIS.
2019 */
2020 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
2021 !(qc->flags & ATA_QCFLAG_FAILED)) {
2022 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
2023 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
2024 } else
2025 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
2026
2027 return true;
2028 }
2029
2030 static void ahci_freeze(struct ata_port *ap)
2031 {
2032 void __iomem *port_mmio = ahci_port_base(ap);
2033
2034 /* turn IRQ off */
2035 writel(0, port_mmio + PORT_IRQ_MASK);
2036 }
2037
2038 static void ahci_thaw(struct ata_port *ap)
2039 {
2040 struct ahci_host_priv *hpriv = ap->host->private_data;
2041 void __iomem *mmio = hpriv->mmio;
2042 void __iomem *port_mmio = ahci_port_base(ap);
2043 u32 tmp;
2044 struct ahci_port_priv *pp = ap->private_data;
2045
2046 /* clear IRQ */
2047 tmp = readl(port_mmio + PORT_IRQ_STAT);
2048 writel(tmp, port_mmio + PORT_IRQ_STAT);
2049 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
2050
2051 /* turn IRQ back on */
2052 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2053 }
2054
2055 void ahci_error_handler(struct ata_port *ap)
2056 {
2057 struct ahci_host_priv *hpriv = ap->host->private_data;
2058
2059 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
2060 /* restart engine */
2061 ahci_stop_engine(ap);
2062 hpriv->start_engine(ap);
2063 }
2064
2065 sata_pmp_error_handler(ap);
2066
2067 if (!ata_dev_enabled(ap->link.device))
2068 ahci_stop_engine(ap);
2069 }
2070 EXPORT_SYMBOL_GPL(ahci_error_handler);
2071
2072 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
2073 {
2074 struct ata_port *ap = qc->ap;
2075
2076 /* make DMA engine forget about the failed command */
2077 if (qc->flags & ATA_QCFLAG_FAILED)
2078 ahci_kick_engine(ap);
2079 }
2080
2081 static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2082 {
2083 struct ahci_host_priv *hpriv = ap->host->private_data;
2084 void __iomem *port_mmio = ahci_port_base(ap);
2085 struct ata_device *dev = ap->link.device;
2086 u32 devslp, dm, dito, mdat, deto;
2087 int rc;
2088 unsigned int err_mask;
2089
2090 devslp = readl(port_mmio + PORT_DEVSLP);
2091 if (!(devslp & PORT_DEVSLP_DSP)) {
2092 dev_info(ap->host->dev, "port does not support device sleep\n");
2093 return;
2094 }
2095
2096 /* disable device sleep */
2097 if (!sleep) {
2098 if (devslp & PORT_DEVSLP_ADSE) {
2099 writel(devslp & ~PORT_DEVSLP_ADSE,
2100 port_mmio + PORT_DEVSLP);
2101 err_mask = ata_dev_set_feature(dev,
2102 SETFEATURES_SATA_DISABLE,
2103 SATA_DEVSLP);
2104 if (err_mask && err_mask != AC_ERR_DEV)
2105 ata_dev_warn(dev, "failed to disable DEVSLP\n");
2106 }
2107 return;
2108 }
2109
2110 /* device sleep was already enabled */
2111 if (devslp & PORT_DEVSLP_ADSE)
2112 return;
2113
2114 /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2115 rc = ahci_stop_engine(ap);
2116 if (rc)
2117 return;
2118
2119 dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2120 dito = devslp_idle_timeout / (dm + 1);
2121 if (dito > 0x3ff)
2122 dito = 0x3ff;
2123
2124 /* Use the nominal value 10 ms if the read MDAT is zero,
2125 * the nominal value of DETO is 20 ms.
2126 */
2127 if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2128 ATA_LOG_DEVSLP_VALID_MASK) {
2129 mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2130 ATA_LOG_DEVSLP_MDAT_MASK;
2131 if (!mdat)
2132 mdat = 10;
2133 deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2134 if (!deto)
2135 deto = 20;
2136 } else {
2137 mdat = 10;
2138 deto = 20;
2139 }
2140
2141 devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2142 (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2143 (deto << PORT_DEVSLP_DETO_OFFSET) |
2144 PORT_DEVSLP_ADSE);
2145 writel(devslp, port_mmio + PORT_DEVSLP);
2146
2147 hpriv->start_engine(ap);
2148
2149 /* enable device sleep feature for the drive */
2150 err_mask = ata_dev_set_feature(dev,
2151 SETFEATURES_SATA_ENABLE,
2152 SATA_DEVSLP);
2153 if (err_mask && err_mask != AC_ERR_DEV)
2154 ata_dev_warn(dev, "failed to enable DEVSLP\n");
2155 }
2156
2157 static void ahci_enable_fbs(struct ata_port *ap)
2158 {
2159 struct ahci_host_priv *hpriv = ap->host->private_data;
2160 struct ahci_port_priv *pp = ap->private_data;
2161 void __iomem *port_mmio = ahci_port_base(ap);
2162 u32 fbs;
2163 int rc;
2164
2165 if (!pp->fbs_supported)
2166 return;
2167
2168 fbs = readl(port_mmio + PORT_FBS);
2169 if (fbs & PORT_FBS_EN) {
2170 pp->fbs_enabled = true;
2171 pp->fbs_last_dev = -1; /* initialization */
2172 return;
2173 }
2174
2175 rc = ahci_stop_engine(ap);
2176 if (rc)
2177 return;
2178
2179 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2180 fbs = readl(port_mmio + PORT_FBS);
2181 if (fbs & PORT_FBS_EN) {
2182 dev_info(ap->host->dev, "FBS is enabled\n");
2183 pp->fbs_enabled = true;
2184 pp->fbs_last_dev = -1; /* initialization */
2185 } else
2186 dev_err(ap->host->dev, "Failed to enable FBS\n");
2187
2188 hpriv->start_engine(ap);
2189 }
2190
2191 static void ahci_disable_fbs(struct ata_port *ap)
2192 {
2193 struct ahci_host_priv *hpriv = ap->host->private_data;
2194 struct ahci_port_priv *pp = ap->private_data;
2195 void __iomem *port_mmio = ahci_port_base(ap);
2196 u32 fbs;
2197 int rc;
2198
2199 if (!pp->fbs_supported)
2200 return;
2201
2202 fbs = readl(port_mmio + PORT_FBS);
2203 if ((fbs & PORT_FBS_EN) == 0) {
2204 pp->fbs_enabled = false;
2205 return;
2206 }
2207
2208 rc = ahci_stop_engine(ap);
2209 if (rc)
2210 return;
2211
2212 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2213 fbs = readl(port_mmio + PORT_FBS);
2214 if (fbs & PORT_FBS_EN)
2215 dev_err(ap->host->dev, "Failed to disable FBS\n");
2216 else {
2217 dev_info(ap->host->dev, "FBS is disabled\n");
2218 pp->fbs_enabled = false;
2219 }
2220
2221 hpriv->start_engine(ap);
2222 }
2223
2224 static void ahci_pmp_attach(struct ata_port *ap)
2225 {
2226 void __iomem *port_mmio = ahci_port_base(ap);
2227 struct ahci_port_priv *pp = ap->private_data;
2228 u32 cmd;
2229
2230 cmd = readl(port_mmio + PORT_CMD);
2231 cmd |= PORT_CMD_PMP;
2232 writel(cmd, port_mmio + PORT_CMD);
2233
2234 ahci_enable_fbs(ap);
2235
2236 pp->intr_mask |= PORT_IRQ_BAD_PMP;
2237
2238 /*
2239 * We must not change the port interrupt mask register if the
2240 * port is marked frozen, the value in pp->intr_mask will be
2241 * restored later when the port is thawed.
2242 *
2243 * Note that during initialization, the port is marked as
2244 * frozen since the irq handler is not yet registered.
2245 */
2246 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2247 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2248 }
2249
2250 static void ahci_pmp_detach(struct ata_port *ap)
2251 {
2252 void __iomem *port_mmio = ahci_port_base(ap);
2253 struct ahci_port_priv *pp = ap->private_data;
2254 u32 cmd;
2255
2256 ahci_disable_fbs(ap);
2257
2258 cmd = readl(port_mmio + PORT_CMD);
2259 cmd &= ~PORT_CMD_PMP;
2260 writel(cmd, port_mmio + PORT_CMD);
2261
2262 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2263
2264 /* see comment above in ahci_pmp_attach() */
2265 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2266 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2267 }
2268
2269 int ahci_port_resume(struct ata_port *ap)
2270 {
2271 ahci_rpm_get_port(ap);
2272
2273 ahci_power_up(ap);
2274 ahci_start_port(ap);
2275
2276 if (sata_pmp_attached(ap))
2277 ahci_pmp_attach(ap);
2278 else
2279 ahci_pmp_detach(ap);
2280
2281 return 0;
2282 }
2283 EXPORT_SYMBOL_GPL(ahci_port_resume);
2284
2285 #ifdef CONFIG_PM
2286 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2287 {
2288 const char *emsg = NULL;
2289 int rc;
2290
2291 rc = ahci_deinit_port(ap, &emsg);
2292 if (rc == 0)
2293 ahci_power_down(ap);
2294 else {
2295 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2296 ata_port_freeze(ap);
2297 }
2298
2299 ahci_rpm_put_port(ap);
2300 return rc;
2301 }
2302 #endif
2303
2304 static int ahci_port_start(struct ata_port *ap)
2305 {
2306 struct ahci_host_priv *hpriv = ap->host->private_data;
2307 struct device *dev = ap->host->dev;
2308 struct ahci_port_priv *pp;
2309 void *mem;
2310 dma_addr_t mem_dma;
2311 size_t dma_sz, rx_fis_sz;
2312
2313 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2314 if (!pp)
2315 return -ENOMEM;
2316
2317 if (ap->host->n_ports > 1) {
2318 pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
2319 if (!pp->irq_desc) {
2320 devm_kfree(dev, pp);
2321 return -ENOMEM;
2322 }
2323 snprintf(pp->irq_desc, 8,
2324 "%s%d", dev_driver_string(dev), ap->port_no);
2325 }
2326
2327 /* check FBS capability */
2328 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2329 void __iomem *port_mmio = ahci_port_base(ap);
2330 u32 cmd = readl(port_mmio + PORT_CMD);
2331 if (cmd & PORT_CMD_FBSCP)
2332 pp->fbs_supported = true;
2333 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2334 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2335 ap->port_no);
2336 pp->fbs_supported = true;
2337 } else
2338 dev_warn(dev, "port %d is not capable of FBS\n",
2339 ap->port_no);
2340 }
2341
2342 if (pp->fbs_supported) {
2343 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2344 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2345 } else {
2346 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2347 rx_fis_sz = AHCI_RX_FIS_SZ;
2348 }
2349
2350 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2351 if (!mem)
2352 return -ENOMEM;
2353 memset(mem, 0, dma_sz);
2354
2355 /*
2356 * First item in chunk of DMA memory: 32-slot command table,
2357 * 32 bytes each in size
2358 */
2359 pp->cmd_slot = mem;
2360 pp->cmd_slot_dma = mem_dma;
2361
2362 mem += AHCI_CMD_SLOT_SZ;
2363 mem_dma += AHCI_CMD_SLOT_SZ;
2364
2365 /*
2366 * Second item: Received-FIS area
2367 */
2368 pp->rx_fis = mem;
2369 pp->rx_fis_dma = mem_dma;
2370
2371 mem += rx_fis_sz;
2372 mem_dma += rx_fis_sz;
2373
2374 /*
2375 * Third item: data area for storing a single command
2376 * and its scatter-gather table
2377 */
2378 pp->cmd_tbl = mem;
2379 pp->cmd_tbl_dma = mem_dma;
2380
2381 /*
2382 * Save off initial list of interrupts to be enabled.
2383 * This could be changed later
2384 */
2385 pp->intr_mask = DEF_PORT_IRQ;
2386
2387 /*
2388 * Switch to per-port locking in case each port has its own MSI vector.
2389 */
2390 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2391 spin_lock_init(&pp->lock);
2392 ap->lock = &pp->lock;
2393 }
2394
2395 ap->private_data = pp;
2396
2397 /* engage engines, captain */
2398 return ahci_port_resume(ap);
2399 }
2400
2401 static void ahci_port_stop(struct ata_port *ap)
2402 {
2403 const char *emsg = NULL;
2404 struct ahci_host_priv *hpriv = ap->host->private_data;
2405 void __iomem *host_mmio = hpriv->mmio;
2406 int rc;
2407
2408 /* de-initialize port */
2409 rc = ahci_deinit_port(ap, &emsg);
2410 if (rc)
2411 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2412
2413 /*
2414 * Clear GHC.IS to prevent stuck INTx after disabling MSI and
2415 * re-enabling INTx.
2416 */
2417 writel(1 << ap->port_no, host_mmio + HOST_IRQ_STAT);
2418 }
2419
2420 void ahci_print_info(struct ata_host *host, const char *scc_s)
2421 {
2422 struct ahci_host_priv *hpriv = host->private_data;
2423 u32 vers, cap, cap2, impl, speed;
2424 const char *speed_s;
2425
2426 vers = hpriv->version;
2427 cap = hpriv->cap;
2428 cap2 = hpriv->cap2;
2429 impl = hpriv->port_map;
2430
2431 speed = (cap >> 20) & 0xf;
2432 if (speed == 1)
2433 speed_s = "1.5";
2434 else if (speed == 2)
2435 speed_s = "3";
2436 else if (speed == 3)
2437 speed_s = "6";
2438 else
2439 speed_s = "?";
2440
2441 dev_info(host->dev,
2442 "AHCI %02x%02x.%02x%02x "
2443 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2444 ,
2445
2446 (vers >> 24) & 0xff,
2447 (vers >> 16) & 0xff,
2448 (vers >> 8) & 0xff,
2449 vers & 0xff,
2450
2451 ((cap >> 8) & 0x1f) + 1,
2452 (cap & 0x1f) + 1,
2453 speed_s,
2454 impl,
2455 scc_s);
2456
2457 dev_info(host->dev,
2458 "flags: "
2459 "%s%s%s%s%s%s%s"
2460 "%s%s%s%s%s%s%s"
2461 "%s%s%s%s%s%s%s"
2462 "%s%s\n"
2463 ,
2464
2465 cap & HOST_CAP_64 ? "64bit " : "",
2466 cap & HOST_CAP_NCQ ? "ncq " : "",
2467 cap & HOST_CAP_SNTF ? "sntf " : "",
2468 cap & HOST_CAP_MPS ? "ilck " : "",
2469 cap & HOST_CAP_SSS ? "stag " : "",
2470 cap & HOST_CAP_ALPM ? "pm " : "",
2471 cap & HOST_CAP_LED ? "led " : "",
2472 cap & HOST_CAP_CLO ? "clo " : "",
2473 cap & HOST_CAP_ONLY ? "only " : "",
2474 cap & HOST_CAP_PMP ? "pmp " : "",
2475 cap & HOST_CAP_FBS ? "fbs " : "",
2476 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2477 cap & HOST_CAP_SSC ? "slum " : "",
2478 cap & HOST_CAP_PART ? "part " : "",
2479 cap & HOST_CAP_CCC ? "ccc " : "",
2480 cap & HOST_CAP_EMS ? "ems " : "",
2481 cap & HOST_CAP_SXS ? "sxs " : "",
2482 cap2 & HOST_CAP2_DESO ? "deso " : "",
2483 cap2 & HOST_CAP2_SADM ? "sadm " : "",
2484 cap2 & HOST_CAP2_SDS ? "sds " : "",
2485 cap2 & HOST_CAP2_APST ? "apst " : "",
2486 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2487 cap2 & HOST_CAP2_BOH ? "boh " : ""
2488 );
2489 }
2490 EXPORT_SYMBOL_GPL(ahci_print_info);
2491
2492 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2493 struct ata_port_info *pi)
2494 {
2495 u8 messages;
2496 void __iomem *mmio = hpriv->mmio;
2497 u32 em_loc = readl(mmio + HOST_EM_LOC);
2498 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2499
2500 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2501 return;
2502
2503 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2504
2505 if (messages) {
2506 /* store em_loc */
2507 hpriv->em_loc = ((em_loc >> 16) * 4);
2508 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2509 hpriv->em_msg_type = messages;
2510 pi->flags |= ATA_FLAG_EM;
2511 if (!(em_ctl & EM_CTL_ALHD))
2512 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2513 }
2514 }
2515 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2516
2517 static int ahci_host_activate_multi_irqs(struct ata_host *host,
2518 struct scsi_host_template *sht)
2519 {
2520 struct ahci_host_priv *hpriv = host->private_data;
2521 int i, rc;
2522
2523 rc = ata_host_start(host);
2524 if (rc)
2525 return rc;
2526 /*
2527 * Requests IRQs according to AHCI-1.1 when multiple MSIs were
2528 * allocated. That is one MSI per port, starting from @irq.
2529 */
2530 for (i = 0; i < host->n_ports; i++) {
2531 struct ahci_port_priv *pp = host->ports[i]->private_data;
2532 int irq = hpriv->get_irq_vector(host, i);
2533
2534 /* Do not receive interrupts sent by dummy ports */
2535 if (!pp) {
2536 disable_irq(irq);
2537 continue;
2538 }
2539
2540 rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
2541 0, pp->irq_desc, host->ports[i]);
2542
2543 if (rc)
2544 return rc;
2545 ata_port_desc(host->ports[i], "irq %d", irq);
2546 }
2547
2548 return ata_host_register(host, sht);
2549 }
2550
2551 /**
2552 * ahci_host_activate - start AHCI host, request IRQs and register it
2553 * @host: target ATA host
2554 * @sht: scsi_host_template to use when registering the host
2555 *
2556 * LOCKING:
2557 * Inherited from calling layer (may sleep).
2558 *
2559 * RETURNS:
2560 * 0 on success, -errno otherwise.
2561 */
2562 int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
2563 {
2564 struct ahci_host_priv *hpriv = host->private_data;
2565 int irq = hpriv->irq;
2566 int rc;
2567
2568 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2569 if (hpriv->irq_handler)
2570 dev_warn(host->dev,
2571 "both AHCI_HFLAG_MULTI_MSI flag set and custom irq handler implemented\n");
2572 if (!hpriv->get_irq_vector) {
2573 dev_err(host->dev,
2574 "AHCI_HFLAG_MULTI_MSI requires ->get_irq_vector!\n");
2575 return -EIO;
2576 }
2577
2578 rc = ahci_host_activate_multi_irqs(host, sht);
2579 } else {
2580 rc = ata_host_activate(host, irq, hpriv->irq_handler,
2581 IRQF_SHARED, sht);
2582 }
2583
2584
2585 return rc;
2586 }
2587 EXPORT_SYMBOL_GPL(ahci_host_activate);
2588
2589 MODULE_AUTHOR("Jeff Garzik");
2590 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2591 MODULE_LICENSE("GPL");
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