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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * libahci.c - Common AHCI SATA low-level routines
4 *
5 * Maintained by: Tejun Heo <tj@kernel.org>
6 * Please ALWAYS copy linux-ide@vger.kernel.org
7 * on emails.
8 *
9 * Copyright 2004-2005 Red Hat, Inc.
10 *
11 * libata documentation is available via 'make {ps|pdf}docs',
12 * as Documentation/driver-api/libata.rst
13 *
14 * AHCI hardware documentation:
15 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
16 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
17 */
18
19#include <linux/bitops.h>
20#include <linux/kernel.h>
21#include <linux/gfp.h>
22#include <linux/module.h>
23#include <linux/nospec.h>
24#include <linux/blkdev.h>
25#include <linux/delay.h>
26#include <linux/interrupt.h>
27#include <linux/dma-mapping.h>
28#include <linux/device.h>
29#include <scsi/scsi_host.h>
30#include <scsi/scsi_cmnd.h>
31#include <linux/libata.h>
32#include <linux/pci.h>
33#include "ahci.h"
34#include "libata.h"
35
36static int ahci_skip_host_reset;
37int ahci_ignore_sss;
38EXPORT_SYMBOL_GPL(ahci_ignore_sss);
39
40module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
41MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
42
43module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
44MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
45
46static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
47 unsigned hints);
48static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
49static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
50 size_t size);
51static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
52 ssize_t size);
53
54
55
56static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
57static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
58static void ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
59static void ahci_qc_ncq_fill_rtf(struct ata_port *ap, u64 done_mask);
60static int ahci_port_start(struct ata_port *ap);
61static void ahci_port_stop(struct ata_port *ap);
62static enum ata_completion_errors ahci_qc_prep(struct ata_queued_cmd *qc);
63static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
64static void ahci_freeze(struct ata_port *ap);
65static void ahci_thaw(struct ata_port *ap);
66static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep);
67static void ahci_enable_fbs(struct ata_port *ap);
68static void ahci_disable_fbs(struct ata_port *ap);
69static void ahci_pmp_attach(struct ata_port *ap);
70static void ahci_pmp_detach(struct ata_port *ap);
71static int ahci_softreset(struct ata_link *link, unsigned int *class,
72 unsigned long deadline);
73static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
74 unsigned long deadline);
75static int ahci_hardreset(struct ata_link *link, unsigned int *class,
76 unsigned long deadline);
77static void ahci_postreset(struct ata_link *link, unsigned int *class);
78static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
79static void ahci_dev_config(struct ata_device *dev);
80#ifdef CONFIG_PM
81static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
82#endif
83static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
84static ssize_t ahci_activity_store(struct ata_device *dev,
85 enum sw_activity val);
86static void ahci_init_sw_activity(struct ata_link *link);
87
88static ssize_t ahci_show_host_caps(struct device *dev,
89 struct device_attribute *attr, char *buf);
90static ssize_t ahci_show_host_cap2(struct device *dev,
91 struct device_attribute *attr, char *buf);
92static ssize_t ahci_show_host_version(struct device *dev,
93 struct device_attribute *attr, char *buf);
94static ssize_t ahci_show_port_cmd(struct device *dev,
95 struct device_attribute *attr, char *buf);
96static ssize_t ahci_read_em_buffer(struct device *dev,
97 struct device_attribute *attr, char *buf);
98static ssize_t ahci_store_em_buffer(struct device *dev,
99 struct device_attribute *attr,
100 const char *buf, size_t size);
101static ssize_t ahci_show_em_supported(struct device *dev,
102 struct device_attribute *attr, char *buf);
103static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance);
104
105static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
106static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
107static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
108static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
109static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
110 ahci_read_em_buffer, ahci_store_em_buffer);
111static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
112
113static struct attribute *ahci_shost_attrs[] = {
114 &dev_attr_link_power_management_policy.attr,
115 &dev_attr_em_message_type.attr,
116 &dev_attr_em_message.attr,
117 &dev_attr_ahci_host_caps.attr,
118 &dev_attr_ahci_host_cap2.attr,
119 &dev_attr_ahci_host_version.attr,
120 &dev_attr_ahci_port_cmd.attr,
121 &dev_attr_em_buffer.attr,
122 &dev_attr_em_message_supported.attr,
123 NULL
124};
125
126static const struct attribute_group ahci_shost_attr_group = {
127 .attrs = ahci_shost_attrs
128};
129
130const struct attribute_group *ahci_shost_groups[] = {
131 &ahci_shost_attr_group,
132 NULL
133};
134EXPORT_SYMBOL_GPL(ahci_shost_groups);
135
136static struct attribute *ahci_sdev_attrs[] = {
137 &dev_attr_sw_activity.attr,
138 &dev_attr_unload_heads.attr,
139 &dev_attr_ncq_prio_supported.attr,
140 &dev_attr_ncq_prio_enable.attr,
141 NULL
142};
143
144static const struct attribute_group ahci_sdev_attr_group = {
145 .attrs = ahci_sdev_attrs
146};
147
148const struct attribute_group *ahci_sdev_groups[] = {
149 &ahci_sdev_attr_group,
150 NULL
151};
152EXPORT_SYMBOL_GPL(ahci_sdev_groups);
153
154struct ata_port_operations ahci_ops = {
155 .inherits = &sata_pmp_port_ops,
156
157 .qc_defer = ahci_pmp_qc_defer,
158 .qc_prep = ahci_qc_prep,
159 .qc_issue = ahci_qc_issue,
160 .qc_fill_rtf = ahci_qc_fill_rtf,
161 .qc_ncq_fill_rtf = ahci_qc_ncq_fill_rtf,
162
163 .freeze = ahci_freeze,
164 .thaw = ahci_thaw,
165 .softreset = ahci_softreset,
166 .hardreset = ahci_hardreset,
167 .postreset = ahci_postreset,
168 .pmp_softreset = ahci_softreset,
169 .error_handler = ahci_error_handler,
170 .post_internal_cmd = ahci_post_internal_cmd,
171 .dev_config = ahci_dev_config,
172
173 .scr_read = ahci_scr_read,
174 .scr_write = ahci_scr_write,
175 .pmp_attach = ahci_pmp_attach,
176 .pmp_detach = ahci_pmp_detach,
177
178 .set_lpm = ahci_set_lpm,
179 .em_show = ahci_led_show,
180 .em_store = ahci_led_store,
181 .sw_activity_show = ahci_activity_show,
182 .sw_activity_store = ahci_activity_store,
183 .transmit_led_message = ahci_transmit_led_message,
184#ifdef CONFIG_PM
185 .port_suspend = ahci_port_suspend,
186 .port_resume = ahci_port_resume,
187#endif
188 .port_start = ahci_port_start,
189 .port_stop = ahci_port_stop,
190};
191EXPORT_SYMBOL_GPL(ahci_ops);
192
193struct ata_port_operations ahci_pmp_retry_srst_ops = {
194 .inherits = &ahci_ops,
195 .softreset = ahci_pmp_retry_softreset,
196};
197EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
198
199static bool ahci_em_messages __read_mostly = true;
200module_param(ahci_em_messages, bool, 0444);
201/* add other LED protocol types when they become supported */
202MODULE_PARM_DESC(ahci_em_messages,
203 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
204
205/* device sleep idle timeout in ms */
206static int devslp_idle_timeout __read_mostly = 1000;
207module_param(devslp_idle_timeout, int, 0644);
208MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
209
210static void ahci_enable_ahci(void __iomem *mmio)
211{
212 int i;
213 u32 tmp;
214
215 /* turn on AHCI_EN */
216 tmp = readl(mmio + HOST_CTL);
217 if (tmp & HOST_AHCI_EN)
218 return;
219
220 /* Some controllers need AHCI_EN to be written multiple times.
221 * Try a few times before giving up.
222 */
223 for (i = 0; i < 5; i++) {
224 tmp |= HOST_AHCI_EN;
225 writel(tmp, mmio + HOST_CTL);
226 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
227 if (tmp & HOST_AHCI_EN)
228 return;
229 msleep(10);
230 }
231
232 WARN_ON(1);
233}
234
235/**
236 * ahci_rpm_get_port - Make sure the port is powered on
237 * @ap: Port to power on
238 *
239 * Whenever there is need to access the AHCI host registers outside of
240 * normal execution paths, call this function to make sure the host is
241 * actually powered on.
242 */
243static int ahci_rpm_get_port(struct ata_port *ap)
244{
245 return pm_runtime_get_sync(ap->dev);
246}
247
248/**
249 * ahci_rpm_put_port - Undoes ahci_rpm_get_port()
250 * @ap: Port to power down
251 *
252 * Undoes ahci_rpm_get_port() and possibly powers down the AHCI host
253 * if it has no more active users.
254 */
255static void ahci_rpm_put_port(struct ata_port *ap)
256{
257 pm_runtime_put(ap->dev);
258}
259
260static ssize_t ahci_show_host_caps(struct device *dev,
261 struct device_attribute *attr, char *buf)
262{
263 struct Scsi_Host *shost = class_to_shost(dev);
264 struct ata_port *ap = ata_shost_to_port(shost);
265 struct ahci_host_priv *hpriv = ap->host->private_data;
266
267 return sprintf(buf, "%x\n", hpriv->cap);
268}
269
270static ssize_t ahci_show_host_cap2(struct device *dev,
271 struct device_attribute *attr, char *buf)
272{
273 struct Scsi_Host *shost = class_to_shost(dev);
274 struct ata_port *ap = ata_shost_to_port(shost);
275 struct ahci_host_priv *hpriv = ap->host->private_data;
276
277 return sprintf(buf, "%x\n", hpriv->cap2);
278}
279
280static ssize_t ahci_show_host_version(struct device *dev,
281 struct device_attribute *attr, char *buf)
282{
283 struct Scsi_Host *shost = class_to_shost(dev);
284 struct ata_port *ap = ata_shost_to_port(shost);
285 struct ahci_host_priv *hpriv = ap->host->private_data;
286
287 return sprintf(buf, "%x\n", hpriv->version);
288}
289
290static ssize_t ahci_show_port_cmd(struct device *dev,
291 struct device_attribute *attr, char *buf)
292{
293 struct Scsi_Host *shost = class_to_shost(dev);
294 struct ata_port *ap = ata_shost_to_port(shost);
295 void __iomem *port_mmio = ahci_port_base(ap);
296 ssize_t ret;
297
298 ahci_rpm_get_port(ap);
299 ret = sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
300 ahci_rpm_put_port(ap);
301
302 return ret;
303}
304
305static ssize_t ahci_read_em_buffer(struct device *dev,
306 struct device_attribute *attr, char *buf)
307{
308 struct Scsi_Host *shost = class_to_shost(dev);
309 struct ata_port *ap = ata_shost_to_port(shost);
310 struct ahci_host_priv *hpriv = ap->host->private_data;
311 void __iomem *mmio = hpriv->mmio;
312 void __iomem *em_mmio = mmio + hpriv->em_loc;
313 u32 em_ctl, msg;
314 unsigned long flags;
315 size_t count;
316 int i;
317
318 ahci_rpm_get_port(ap);
319 spin_lock_irqsave(ap->lock, flags);
320
321 em_ctl = readl(mmio + HOST_EM_CTL);
322 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
323 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
324 spin_unlock_irqrestore(ap->lock, flags);
325 ahci_rpm_put_port(ap);
326 return -EINVAL;
327 }
328
329 if (!(em_ctl & EM_CTL_MR)) {
330 spin_unlock_irqrestore(ap->lock, flags);
331 ahci_rpm_put_port(ap);
332 return -EAGAIN;
333 }
334
335 if (!(em_ctl & EM_CTL_SMB))
336 em_mmio += hpriv->em_buf_sz;
337
338 count = hpriv->em_buf_sz;
339
340 /* the count should not be larger than PAGE_SIZE */
341 if (count > PAGE_SIZE) {
342 if (printk_ratelimit())
343 ata_port_warn(ap,
344 "EM read buffer size too large: "
345 "buffer size %u, page size %lu\n",
346 hpriv->em_buf_sz, PAGE_SIZE);
347 count = PAGE_SIZE;
348 }
349
350 for (i = 0; i < count; i += 4) {
351 msg = readl(em_mmio + i);
352 buf[i] = msg & 0xff;
353 buf[i + 1] = (msg >> 8) & 0xff;
354 buf[i + 2] = (msg >> 16) & 0xff;
355 buf[i + 3] = (msg >> 24) & 0xff;
356 }
357
358 spin_unlock_irqrestore(ap->lock, flags);
359 ahci_rpm_put_port(ap);
360
361 return i;
362}
363
364static ssize_t ahci_store_em_buffer(struct device *dev,
365 struct device_attribute *attr,
366 const char *buf, size_t size)
367{
368 struct Scsi_Host *shost = class_to_shost(dev);
369 struct ata_port *ap = ata_shost_to_port(shost);
370 struct ahci_host_priv *hpriv = ap->host->private_data;
371 void __iomem *mmio = hpriv->mmio;
372 void __iomem *em_mmio = mmio + hpriv->em_loc;
373 const unsigned char *msg_buf = buf;
374 u32 em_ctl, msg;
375 unsigned long flags;
376 int i;
377
378 /* check size validity */
379 if (!(ap->flags & ATA_FLAG_EM) ||
380 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
381 size % 4 || size > hpriv->em_buf_sz)
382 return -EINVAL;
383
384 ahci_rpm_get_port(ap);
385 spin_lock_irqsave(ap->lock, flags);
386
387 em_ctl = readl(mmio + HOST_EM_CTL);
388 if (em_ctl & EM_CTL_TM) {
389 spin_unlock_irqrestore(ap->lock, flags);
390 ahci_rpm_put_port(ap);
391 return -EBUSY;
392 }
393
394 for (i = 0; i < size; i += 4) {
395 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
396 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
397 writel(msg, em_mmio + i);
398 }
399
400 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
401
402 spin_unlock_irqrestore(ap->lock, flags);
403 ahci_rpm_put_port(ap);
404
405 return size;
406}
407
408static ssize_t ahci_show_em_supported(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
411 struct Scsi_Host *shost = class_to_shost(dev);
412 struct ata_port *ap = ata_shost_to_port(shost);
413 struct ahci_host_priv *hpriv = ap->host->private_data;
414 void __iomem *mmio = hpriv->mmio;
415 u32 em_ctl;
416
417 ahci_rpm_get_port(ap);
418 em_ctl = readl(mmio + HOST_EM_CTL);
419 ahci_rpm_put_port(ap);
420
421 return sprintf(buf, "%s%s%s%s\n",
422 em_ctl & EM_CTL_LED ? "led " : "",
423 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
424 em_ctl & EM_CTL_SES ? "ses-2 " : "",
425 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
426}
427
428/**
429 * ahci_save_initial_config - Save and fixup initial config values
430 * @dev: target AHCI device
431 * @hpriv: host private area to store config values
432 *
433 * Some registers containing configuration info might be setup by
434 * BIOS and might be cleared on reset. This function saves the
435 * initial values of those registers into @hpriv such that they
436 * can be restored after controller reset.
437 *
438 * If inconsistent, config values are fixed up by this function.
439 *
440 * If it is not set already this function sets hpriv->start_engine to
441 * ahci_start_engine.
442 *
443 * LOCKING:
444 * None.
445 */
446void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
447{
448 void __iomem *mmio = hpriv->mmio;
449 void __iomem *port_mmio;
450 unsigned long port_map;
451 u32 cap, cap2, vers;
452 int i;
453
454 /* make sure AHCI mode is enabled before accessing CAP */
455 ahci_enable_ahci(mmio);
456
457 /*
458 * Values prefixed with saved_ are written back to the HBA and ports
459 * registers after reset. Values without are used for driver operation.
460 */
461
462 /*
463 * Override HW-init HBA capability fields with the platform-specific
464 * values. The rest of the HBA capabilities are defined as Read-only
465 * and can't be modified in CSR anyway.
466 */
467 cap = readl(mmio + HOST_CAP);
468 if (hpriv->saved_cap)
469 cap = (cap & ~(HOST_CAP_SSS | HOST_CAP_MPS)) | hpriv->saved_cap;
470 hpriv->saved_cap = cap;
471
472 /* CAP2 register is only defined for AHCI 1.2 and later */
473 vers = readl(mmio + HOST_VERSION);
474 if ((vers >> 16) > 1 ||
475 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
476 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
477 else
478 hpriv->saved_cap2 = cap2 = 0;
479
480 /* some chips have errata preventing 64bit use */
481 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
482 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
483 cap &= ~HOST_CAP_64;
484 }
485
486 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
487 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
488 cap &= ~HOST_CAP_NCQ;
489 }
490
491 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
492 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
493 cap |= HOST_CAP_NCQ;
494 }
495
496 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
497 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
498 cap &= ~HOST_CAP_PMP;
499 }
500
501 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
502 dev_info(dev,
503 "controller can't do SNTF, turning off CAP_SNTF\n");
504 cap &= ~HOST_CAP_SNTF;
505 }
506
507 if ((cap2 & HOST_CAP2_SDS) && (hpriv->flags & AHCI_HFLAG_NO_DEVSLP)) {
508 dev_info(dev,
509 "controller can't do DEVSLP, turning off\n");
510 cap2 &= ~HOST_CAP2_SDS;
511 cap2 &= ~HOST_CAP2_SADM;
512 }
513
514 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
515 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
516 cap |= HOST_CAP_FBS;
517 }
518
519 if ((cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_NO_FBS)) {
520 dev_info(dev, "controller can't do FBS, turning off CAP_FBS\n");
521 cap &= ~HOST_CAP_FBS;
522 }
523
524 if (!(cap & HOST_CAP_ALPM) && (hpriv->flags & AHCI_HFLAG_YES_ALPM)) {
525 dev_info(dev, "controller can do ALPM, turning on CAP_ALPM\n");
526 cap |= HOST_CAP_ALPM;
527 }
528
529 if ((cap & HOST_CAP_SXS) && (hpriv->flags & AHCI_HFLAG_NO_SXS)) {
530 dev_info(dev, "controller does not support SXS, disabling CAP_SXS\n");
531 cap &= ~HOST_CAP_SXS;
532 }
533
534 /* Override the HBA ports mapping if the platform needs it */
535 port_map = readl(mmio + HOST_PORTS_IMPL);
536 if (hpriv->saved_port_map && port_map != hpriv->saved_port_map) {
537 dev_info(dev, "forcing port_map 0x%lx -> 0x%x\n",
538 port_map, hpriv->saved_port_map);
539 port_map = hpriv->saved_port_map;
540 } else {
541 hpriv->saved_port_map = port_map;
542 }
543
544 if (hpriv->mask_port_map) {
545 dev_warn(dev, "masking port_map 0x%lx -> 0x%lx\n",
546 port_map,
547 port_map & hpriv->mask_port_map);
548 port_map &= hpriv->mask_port_map;
549 }
550
551 /* cross check port_map and cap.n_ports */
552 if (port_map) {
553 int map_ports = 0;
554
555 for (i = 0; i < AHCI_MAX_PORTS; i++)
556 if (port_map & (1 << i))
557 map_ports++;
558
559 /* If PI has more ports than n_ports, whine, clear
560 * port_map and let it be generated from n_ports.
561 */
562 if (map_ports > ahci_nr_ports(cap)) {
563 dev_warn(dev,
564 "implemented port map (0x%lx) contains more ports than nr_ports (%u), using nr_ports\n",
565 port_map, ahci_nr_ports(cap));
566 port_map = 0;
567 }
568 }
569
570 /* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
571 if (!port_map && vers < 0x10300) {
572 port_map = (1 << ahci_nr_ports(cap)) - 1;
573 dev_warn(dev, "forcing PORTS_IMPL to 0x%lx\n", port_map);
574
575 /* write the fixed up value to the PI register */
576 hpriv->saved_port_map = port_map;
577 }
578
579 /*
580 * Preserve the ports capabilities defined by the platform. Note there
581 * is no need in storing the rest of the P#.CMD fields since they are
582 * volatile.
583 */
584 for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
585 if (hpriv->saved_port_cap[i])
586 continue;
587
588 port_mmio = __ahci_port_base(hpriv, i);
589 hpriv->saved_port_cap[i] =
590 readl(port_mmio + PORT_CMD) & PORT_CMD_CAP;
591 }
592
593 /* record values to use during operation */
594 hpriv->cap = cap;
595 hpriv->cap2 = cap2;
596 hpriv->version = vers;
597 hpriv->port_map = port_map;
598
599 if (!hpriv->start_engine)
600 hpriv->start_engine = ahci_start_engine;
601
602 if (!hpriv->stop_engine)
603 hpriv->stop_engine = ahci_stop_engine;
604
605 if (!hpriv->irq_handler)
606 hpriv->irq_handler = ahci_single_level_irq_intr;
607}
608EXPORT_SYMBOL_GPL(ahci_save_initial_config);
609
610/**
611 * ahci_restore_initial_config - Restore initial config
612 * @host: target ATA host
613 *
614 * Restore initial config stored by ahci_save_initial_config().
615 *
616 * LOCKING:
617 * None.
618 */
619static void ahci_restore_initial_config(struct ata_host *host)
620{
621 struct ahci_host_priv *hpriv = host->private_data;
622 unsigned long port_map = hpriv->port_map;
623 void __iomem *mmio = hpriv->mmio;
624 void __iomem *port_mmio;
625 int i;
626
627 writel(hpriv->saved_cap, mmio + HOST_CAP);
628 if (hpriv->saved_cap2)
629 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
630 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
631 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
632
633 for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
634 port_mmio = __ahci_port_base(hpriv, i);
635 writel(hpriv->saved_port_cap[i], port_mmio + PORT_CMD);
636 }
637}
638
639static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
640{
641 static const int offset[] = {
642 [SCR_STATUS] = PORT_SCR_STAT,
643 [SCR_CONTROL] = PORT_SCR_CTL,
644 [SCR_ERROR] = PORT_SCR_ERR,
645 [SCR_ACTIVE] = PORT_SCR_ACT,
646 [SCR_NOTIFICATION] = PORT_SCR_NTF,
647 };
648 struct ahci_host_priv *hpriv = ap->host->private_data;
649
650 if (sc_reg < ARRAY_SIZE(offset) &&
651 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
652 return offset[sc_reg];
653 return 0;
654}
655
656static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
657{
658 void __iomem *port_mmio = ahci_port_base(link->ap);
659 int offset = ahci_scr_offset(link->ap, sc_reg);
660
661 if (offset) {
662 *val = readl(port_mmio + offset);
663 return 0;
664 }
665 return -EINVAL;
666}
667
668static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
669{
670 void __iomem *port_mmio = ahci_port_base(link->ap);
671 int offset = ahci_scr_offset(link->ap, sc_reg);
672
673 if (offset) {
674 writel(val, port_mmio + offset);
675 return 0;
676 }
677 return -EINVAL;
678}
679
680void ahci_start_engine(struct ata_port *ap)
681{
682 void __iomem *port_mmio = ahci_port_base(ap);
683 u32 tmp;
684
685 /* start DMA */
686 tmp = readl(port_mmio + PORT_CMD);
687 tmp |= PORT_CMD_START;
688 writel(tmp, port_mmio + PORT_CMD);
689 readl(port_mmio + PORT_CMD); /* flush */
690}
691EXPORT_SYMBOL_GPL(ahci_start_engine);
692
693int ahci_stop_engine(struct ata_port *ap)
694{
695 void __iomem *port_mmio = ahci_port_base(ap);
696 struct ahci_host_priv *hpriv = ap->host->private_data;
697 u32 tmp;
698
699 /*
700 * On some controllers, stopping a port's DMA engine while the port
701 * is in ALPM state (partial or slumber) results in failures on
702 * subsequent DMA engine starts. For those controllers, put the
703 * port back in active state before stopping its DMA engine.
704 */
705 if ((hpriv->flags & AHCI_HFLAG_WAKE_BEFORE_STOP) &&
706 (ap->link.lpm_policy > ATA_LPM_MAX_POWER) &&
707 ahci_set_lpm(&ap->link, ATA_LPM_MAX_POWER, ATA_LPM_WAKE_ONLY)) {
708 dev_err(ap->host->dev, "Failed to wake up port before engine stop\n");
709 return -EIO;
710 }
711
712 tmp = readl(port_mmio + PORT_CMD);
713
714 /* check if the HBA is idle */
715 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
716 return 0;
717
718 /*
719 * Don't try to issue commands but return with ENODEV if the
720 * AHCI controller not available anymore (e.g. due to PCIe hot
721 * unplugging). Otherwise a 500ms delay for each port is added.
722 */
723 if (tmp == 0xffffffff) {
724 dev_err(ap->host->dev, "AHCI controller unavailable!\n");
725 return -ENODEV;
726 }
727
728 /* setting HBA to idle */
729 tmp &= ~PORT_CMD_START;
730 writel(tmp, port_mmio + PORT_CMD);
731
732 /* wait for engine to stop. This could be as long as 500 msec */
733 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
734 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
735 if (tmp & PORT_CMD_LIST_ON)
736 return -EIO;
737
738 return 0;
739}
740EXPORT_SYMBOL_GPL(ahci_stop_engine);
741
742void ahci_start_fis_rx(struct ata_port *ap)
743{
744 void __iomem *port_mmio = ahci_port_base(ap);
745 struct ahci_host_priv *hpriv = ap->host->private_data;
746 struct ahci_port_priv *pp = ap->private_data;
747 u32 tmp;
748
749 /* set FIS registers */
750 if (hpriv->cap & HOST_CAP_64)
751 writel((pp->cmd_slot_dma >> 16) >> 16,
752 port_mmio + PORT_LST_ADDR_HI);
753 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
754
755 if (hpriv->cap & HOST_CAP_64)
756 writel((pp->rx_fis_dma >> 16) >> 16,
757 port_mmio + PORT_FIS_ADDR_HI);
758 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
759
760 /* enable FIS reception */
761 tmp = readl(port_mmio + PORT_CMD);
762 tmp |= PORT_CMD_FIS_RX;
763 writel(tmp, port_mmio + PORT_CMD);
764
765 /* flush */
766 readl(port_mmio + PORT_CMD);
767}
768EXPORT_SYMBOL_GPL(ahci_start_fis_rx);
769
770static int ahci_stop_fis_rx(struct ata_port *ap)
771{
772 void __iomem *port_mmio = ahci_port_base(ap);
773 u32 tmp;
774
775 /* disable FIS reception */
776 tmp = readl(port_mmio + PORT_CMD);
777 tmp &= ~PORT_CMD_FIS_RX;
778 writel(tmp, port_mmio + PORT_CMD);
779
780 /* wait for completion, spec says 500ms, give it 1000 */
781 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
782 PORT_CMD_FIS_ON, 10, 1000);
783 if (tmp & PORT_CMD_FIS_ON)
784 return -EBUSY;
785
786 return 0;
787}
788
789static void ahci_power_up(struct ata_port *ap)
790{
791 struct ahci_host_priv *hpriv = ap->host->private_data;
792 void __iomem *port_mmio = ahci_port_base(ap);
793 u32 cmd;
794
795 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
796
797 /* spin up device */
798 if (hpriv->cap & HOST_CAP_SSS) {
799 cmd |= PORT_CMD_SPIN_UP;
800 writel(cmd, port_mmio + PORT_CMD);
801 }
802
803 /* wake up link */
804 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
805}
806
807static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
808 unsigned int hints)
809{
810 struct ata_port *ap = link->ap;
811 struct ahci_host_priv *hpriv = ap->host->private_data;
812 struct ahci_port_priv *pp = ap->private_data;
813 void __iomem *port_mmio = ahci_port_base(ap);
814
815 if (policy != ATA_LPM_MAX_POWER) {
816 /* wakeup flag only applies to the max power policy */
817 hints &= ~ATA_LPM_WAKE_ONLY;
818
819 /*
820 * Disable interrupts on Phy Ready. This keeps us from
821 * getting woken up due to spurious phy ready
822 * interrupts.
823 */
824 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
825 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
826
827 sata_link_scr_lpm(link, policy, false);
828 }
829
830 if (hpriv->cap & HOST_CAP_ALPM) {
831 u32 cmd = readl(port_mmio + PORT_CMD);
832
833 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
834 if (!(hints & ATA_LPM_WAKE_ONLY))
835 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
836 cmd |= PORT_CMD_ICC_ACTIVE;
837
838 writel(cmd, port_mmio + PORT_CMD);
839 readl(port_mmio + PORT_CMD);
840
841 /* wait 10ms to be sure we've come out of LPM state */
842 ata_msleep(ap, 10);
843
844 if (hints & ATA_LPM_WAKE_ONLY)
845 return 0;
846 } else {
847 cmd |= PORT_CMD_ALPE;
848 if (policy == ATA_LPM_MIN_POWER)
849 cmd |= PORT_CMD_ASP;
850 else if (policy == ATA_LPM_MIN_POWER_WITH_PARTIAL)
851 cmd &= ~PORT_CMD_ASP;
852
853 /* write out new cmd value */
854 writel(cmd, port_mmio + PORT_CMD);
855 }
856 }
857
858 /* set aggressive device sleep */
859 if ((hpriv->cap2 & HOST_CAP2_SDS) &&
860 (hpriv->cap2 & HOST_CAP2_SADM) &&
861 (link->device->flags & ATA_DFLAG_DEVSLP)) {
862 if (policy == ATA_LPM_MIN_POWER ||
863 policy == ATA_LPM_MIN_POWER_WITH_PARTIAL)
864 ahci_set_aggressive_devslp(ap, true);
865 else
866 ahci_set_aggressive_devslp(ap, false);
867 }
868
869 if (policy == ATA_LPM_MAX_POWER) {
870 sata_link_scr_lpm(link, policy, false);
871
872 /* turn PHYRDY IRQ back on */
873 pp->intr_mask |= PORT_IRQ_PHYRDY;
874 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
875 }
876
877 return 0;
878}
879
880#ifdef CONFIG_PM
881static void ahci_power_down(struct ata_port *ap)
882{
883 struct ahci_host_priv *hpriv = ap->host->private_data;
884 void __iomem *port_mmio = ahci_port_base(ap);
885 u32 cmd, scontrol;
886
887 if (!(hpriv->cap & HOST_CAP_SSS))
888 return;
889
890 /* put device into listen mode, first set PxSCTL.DET to 0 */
891 scontrol = readl(port_mmio + PORT_SCR_CTL);
892 scontrol &= ~0xf;
893 writel(scontrol, port_mmio + PORT_SCR_CTL);
894
895 /* then set PxCMD.SUD to 0 */
896 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
897 cmd &= ~PORT_CMD_SPIN_UP;
898 writel(cmd, port_mmio + PORT_CMD);
899}
900#endif
901
902static void ahci_start_port(struct ata_port *ap)
903{
904 struct ahci_host_priv *hpriv = ap->host->private_data;
905 struct ahci_port_priv *pp = ap->private_data;
906 struct ata_link *link;
907 struct ahci_em_priv *emp;
908 ssize_t rc;
909 int i;
910
911 /* enable FIS reception */
912 ahci_start_fis_rx(ap);
913
914 /* enable DMA */
915 if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
916 hpriv->start_engine(ap);
917
918 /* turn on LEDs */
919 if (ap->flags & ATA_FLAG_EM) {
920 ata_for_each_link(link, ap, EDGE) {
921 emp = &pp->em_priv[link->pmp];
922
923 /* EM Transmit bit maybe busy during init */
924 for (i = 0; i < EM_MAX_RETRY; i++) {
925 rc = ap->ops->transmit_led_message(ap,
926 emp->led_state,
927 4);
928 /*
929 * If busy, give a breather but do not
930 * release EH ownership by using msleep()
931 * instead of ata_msleep(). EM Transmit
932 * bit is busy for the whole host and
933 * releasing ownership will cause other
934 * ports to fail the same way.
935 */
936 if (rc == -EBUSY)
937 msleep(1);
938 else
939 break;
940 }
941 }
942 }
943
944 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
945 ata_for_each_link(link, ap, EDGE)
946 ahci_init_sw_activity(link);
947
948}
949
950static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
951{
952 int rc;
953 struct ahci_host_priv *hpriv = ap->host->private_data;
954
955 /* disable DMA */
956 rc = hpriv->stop_engine(ap);
957 if (rc) {
958 *emsg = "failed to stop engine";
959 return rc;
960 }
961
962 /* disable FIS reception */
963 rc = ahci_stop_fis_rx(ap);
964 if (rc) {
965 *emsg = "failed stop FIS RX";
966 return rc;
967 }
968
969 return 0;
970}
971
972int ahci_reset_controller(struct ata_host *host)
973{
974 struct ahci_host_priv *hpriv = host->private_data;
975 void __iomem *mmio = hpriv->mmio;
976 u32 tmp;
977
978 /*
979 * We must be in AHCI mode, before using anything AHCI-specific, such
980 * as HOST_RESET.
981 */
982 ahci_enable_ahci(mmio);
983
984 /* Global controller reset */
985 if (ahci_skip_host_reset) {
986 dev_info(host->dev, "Skipping global host reset\n");
987 return 0;
988 }
989
990 tmp = readl(mmio + HOST_CTL);
991 if (!(tmp & HOST_RESET)) {
992 writel(tmp | HOST_RESET, mmio + HOST_CTL);
993 readl(mmio + HOST_CTL); /* flush */
994 }
995
996 /*
997 * To perform host reset, OS should set HOST_RESET and poll until this
998 * bit is read to be "0". Reset must complete within 1 second, or the
999 * hardware should be considered fried.
1000 */
1001 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
1002 HOST_RESET, 10, 1000);
1003 if (tmp & HOST_RESET) {
1004 dev_err(host->dev, "Controller reset failed (0x%x)\n",
1005 tmp);
1006 return -EIO;
1007 }
1008
1009 /* Turn on AHCI mode */
1010 ahci_enable_ahci(mmio);
1011
1012 /* Some registers might be cleared on reset. Restore initial values. */
1013 if (!(hpriv->flags & AHCI_HFLAG_NO_WRITE_TO_RO))
1014 ahci_restore_initial_config(host);
1015
1016 return 0;
1017}
1018EXPORT_SYMBOL_GPL(ahci_reset_controller);
1019
1020static void ahci_sw_activity(struct ata_link *link)
1021{
1022 struct ata_port *ap = link->ap;
1023 struct ahci_port_priv *pp = ap->private_data;
1024 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1025
1026 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
1027 return;
1028
1029 emp->activity++;
1030 if (!timer_pending(&emp->timer))
1031 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
1032}
1033
1034static void ahci_sw_activity_blink(struct timer_list *t)
1035{
1036 struct ahci_em_priv *emp = from_timer(emp, t, timer);
1037 struct ata_link *link = emp->link;
1038 struct ata_port *ap = link->ap;
1039
1040 unsigned long led_message = emp->led_state;
1041 u32 activity_led_state;
1042 unsigned long flags;
1043
1044 led_message &= EM_MSG_LED_VALUE;
1045 led_message |= ap->port_no | (link->pmp << 8);
1046
1047 /* check to see if we've had activity. If so,
1048 * toggle state of LED and reset timer. If not,
1049 * turn LED to desired idle state.
1050 */
1051 spin_lock_irqsave(ap->lock, flags);
1052 if (emp->saved_activity != emp->activity) {
1053 emp->saved_activity = emp->activity;
1054 /* get the current LED state */
1055 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
1056
1057 if (activity_led_state)
1058 activity_led_state = 0;
1059 else
1060 activity_led_state = 1;
1061
1062 /* clear old state */
1063 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
1064
1065 /* toggle state */
1066 led_message |= (activity_led_state << 16);
1067 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
1068 } else {
1069 /* switch to idle */
1070 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
1071 if (emp->blink_policy == BLINK_OFF)
1072 led_message |= (1 << 16);
1073 }
1074 spin_unlock_irqrestore(ap->lock, flags);
1075 ap->ops->transmit_led_message(ap, led_message, 4);
1076}
1077
1078static void ahci_init_sw_activity(struct ata_link *link)
1079{
1080 struct ata_port *ap = link->ap;
1081 struct ahci_port_priv *pp = ap->private_data;
1082 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1083
1084 /* init activity stats, setup timer */
1085 emp->saved_activity = emp->activity = 0;
1086 emp->link = link;
1087 timer_setup(&emp->timer, ahci_sw_activity_blink, 0);
1088
1089 /* check our blink policy and set flag for link if it's enabled */
1090 if (emp->blink_policy)
1091 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1092}
1093
1094int ahci_reset_em(struct ata_host *host)
1095{
1096 struct ahci_host_priv *hpriv = host->private_data;
1097 void __iomem *mmio = hpriv->mmio;
1098 u32 em_ctl;
1099
1100 em_ctl = readl(mmio + HOST_EM_CTL);
1101 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
1102 return -EINVAL;
1103
1104 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
1105 return 0;
1106}
1107EXPORT_SYMBOL_GPL(ahci_reset_em);
1108
1109static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
1110 ssize_t size)
1111{
1112 struct ahci_host_priv *hpriv = ap->host->private_data;
1113 struct ahci_port_priv *pp = ap->private_data;
1114 void __iomem *mmio = hpriv->mmio;
1115 u32 em_ctl;
1116 u32 message[] = {0, 0};
1117 unsigned long flags;
1118 int pmp;
1119 struct ahci_em_priv *emp;
1120
1121 /* get the slot number from the message */
1122 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1123 if (pmp < EM_MAX_SLOTS)
1124 emp = &pp->em_priv[pmp];
1125 else
1126 return -EINVAL;
1127
1128 ahci_rpm_get_port(ap);
1129 spin_lock_irqsave(ap->lock, flags);
1130
1131 /*
1132 * if we are still busy transmitting a previous message,
1133 * do not allow
1134 */
1135 em_ctl = readl(mmio + HOST_EM_CTL);
1136 if (em_ctl & EM_CTL_TM) {
1137 spin_unlock_irqrestore(ap->lock, flags);
1138 ahci_rpm_put_port(ap);
1139 return -EBUSY;
1140 }
1141
1142 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
1143 /*
1144 * create message header - this is all zero except for
1145 * the message size, which is 4 bytes.
1146 */
1147 message[0] |= (4 << 8);
1148
1149 /* ignore 0:4 of byte zero, fill in port info yourself */
1150 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
1151
1152 /* write message to EM_LOC */
1153 writel(message[0], mmio + hpriv->em_loc);
1154 writel(message[1], mmio + hpriv->em_loc+4);
1155
1156 /*
1157 * tell hardware to transmit the message
1158 */
1159 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1160 }
1161
1162 /* save off new led state for port/slot */
1163 emp->led_state = state;
1164
1165 spin_unlock_irqrestore(ap->lock, flags);
1166 ahci_rpm_put_port(ap);
1167
1168 return size;
1169}
1170
1171static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1172{
1173 struct ahci_port_priv *pp = ap->private_data;
1174 struct ata_link *link;
1175 struct ahci_em_priv *emp;
1176 int rc = 0;
1177
1178 ata_for_each_link(link, ap, EDGE) {
1179 emp = &pp->em_priv[link->pmp];
1180 rc += sprintf(buf, "%lx\n", emp->led_state);
1181 }
1182 return rc;
1183}
1184
1185static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1186 size_t size)
1187{
1188 unsigned int state;
1189 int pmp;
1190 struct ahci_port_priv *pp = ap->private_data;
1191 struct ahci_em_priv *emp;
1192
1193 if (kstrtouint(buf, 0, &state) < 0)
1194 return -EINVAL;
1195
1196 /* get the slot number from the message */
1197 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1198 if (pmp < EM_MAX_SLOTS) {
1199 pmp = array_index_nospec(pmp, EM_MAX_SLOTS);
1200 emp = &pp->em_priv[pmp];
1201 } else {
1202 return -EINVAL;
1203 }
1204
1205 /* mask off the activity bits if we are in sw_activity
1206 * mode, user should turn off sw_activity before setting
1207 * activity led through em_message
1208 */
1209 if (emp->blink_policy)
1210 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1211
1212 return ap->ops->transmit_led_message(ap, state, size);
1213}
1214
1215static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1216{
1217 struct ata_link *link = dev->link;
1218 struct ata_port *ap = link->ap;
1219 struct ahci_port_priv *pp = ap->private_data;
1220 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1221 u32 port_led_state = emp->led_state;
1222
1223 /* save the desired Activity LED behavior */
1224 if (val == OFF) {
1225 /* clear LFLAG */
1226 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1227
1228 /* set the LED to OFF */
1229 port_led_state &= EM_MSG_LED_VALUE_OFF;
1230 port_led_state |= (ap->port_no | (link->pmp << 8));
1231 ap->ops->transmit_led_message(ap, port_led_state, 4);
1232 } else {
1233 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1234 if (val == BLINK_OFF) {
1235 /* set LED to ON for idle */
1236 port_led_state &= EM_MSG_LED_VALUE_OFF;
1237 port_led_state |= (ap->port_no | (link->pmp << 8));
1238 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1239 ap->ops->transmit_led_message(ap, port_led_state, 4);
1240 }
1241 }
1242 emp->blink_policy = val;
1243 return 0;
1244}
1245
1246static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1247{
1248 struct ata_link *link = dev->link;
1249 struct ata_port *ap = link->ap;
1250 struct ahci_port_priv *pp = ap->private_data;
1251 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1252
1253 /* display the saved value of activity behavior for this
1254 * disk.
1255 */
1256 return sprintf(buf, "%d\n", emp->blink_policy);
1257}
1258
1259static void ahci_port_clear_pending_irq(struct ata_port *ap)
1260{
1261 struct ahci_host_priv *hpriv = ap->host->private_data;
1262 void __iomem *port_mmio = ahci_port_base(ap);
1263 u32 tmp;
1264
1265 /* clear SError */
1266 tmp = readl(port_mmio + PORT_SCR_ERR);
1267 dev_dbg(ap->host->dev, "PORT_SCR_ERR 0x%x\n", tmp);
1268 writel(tmp, port_mmio + PORT_SCR_ERR);
1269
1270 /* clear port IRQ */
1271 tmp = readl(port_mmio + PORT_IRQ_STAT);
1272 dev_dbg(ap->host->dev, "PORT_IRQ_STAT 0x%x\n", tmp);
1273 if (tmp)
1274 writel(tmp, port_mmio + PORT_IRQ_STAT);
1275
1276 writel(1 << ap->port_no, hpriv->mmio + HOST_IRQ_STAT);
1277}
1278
1279static void ahci_port_init(struct device *dev, struct ata_port *ap,
1280 int port_no, void __iomem *mmio,
1281 void __iomem *port_mmio)
1282{
1283 struct ahci_host_priv *hpriv = ap->host->private_data;
1284 const char *emsg = NULL;
1285 int rc;
1286 u32 tmp;
1287
1288 /* make sure port is not active */
1289 rc = ahci_deinit_port(ap, &emsg);
1290 if (rc)
1291 dev_warn(dev, "%s (%d)\n", emsg, rc);
1292
1293 ahci_port_clear_pending_irq(ap);
1294
1295 /* mark esata ports */
1296 tmp = readl(port_mmio + PORT_CMD);
1297 if ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS))
1298 ap->pflags |= ATA_PFLAG_EXTERNAL;
1299}
1300
1301void ahci_init_controller(struct ata_host *host)
1302{
1303 struct ahci_host_priv *hpriv = host->private_data;
1304 void __iomem *mmio = hpriv->mmio;
1305 int i;
1306 void __iomem *port_mmio;
1307 u32 tmp;
1308
1309 for (i = 0; i < host->n_ports; i++) {
1310 struct ata_port *ap = host->ports[i];
1311
1312 port_mmio = ahci_port_base(ap);
1313 if (ata_port_is_dummy(ap))
1314 continue;
1315
1316 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1317 }
1318
1319 tmp = readl(mmio + HOST_CTL);
1320 dev_dbg(host->dev, "HOST_CTL 0x%x\n", tmp);
1321 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1322 tmp = readl(mmio + HOST_CTL);
1323 dev_dbg(host->dev, "HOST_CTL 0x%x\n", tmp);
1324}
1325EXPORT_SYMBOL_GPL(ahci_init_controller);
1326
1327static void ahci_dev_config(struct ata_device *dev)
1328{
1329 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1330
1331 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1332 dev->max_sectors = 255;
1333 ata_dev_info(dev,
1334 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1335 }
1336}
1337
1338unsigned int ahci_dev_classify(struct ata_port *ap)
1339{
1340 void __iomem *port_mmio = ahci_port_base(ap);
1341 struct ata_taskfile tf;
1342 u32 tmp;
1343
1344 tmp = readl(port_mmio + PORT_SIG);
1345 tf.lbah = (tmp >> 24) & 0xff;
1346 tf.lbam = (tmp >> 16) & 0xff;
1347 tf.lbal = (tmp >> 8) & 0xff;
1348 tf.nsect = (tmp) & 0xff;
1349
1350 return ata_port_classify(ap, &tf);
1351}
1352EXPORT_SYMBOL_GPL(ahci_dev_classify);
1353
1354void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1355 u32 opts)
1356{
1357 dma_addr_t cmd_tbl_dma;
1358
1359 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1360
1361 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1362 pp->cmd_slot[tag].status = 0;
1363 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1364 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1365}
1366EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1367
1368int ahci_kick_engine(struct ata_port *ap)
1369{
1370 void __iomem *port_mmio = ahci_port_base(ap);
1371 struct ahci_host_priv *hpriv = ap->host->private_data;
1372 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1373 u32 tmp;
1374 int busy, rc;
1375
1376 /* stop engine */
1377 rc = hpriv->stop_engine(ap);
1378 if (rc)
1379 goto out_restart;
1380
1381 /* need to do CLO?
1382 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1383 */
1384 busy = status & (ATA_BUSY | ATA_DRQ);
1385 if (!busy && !sata_pmp_attached(ap)) {
1386 rc = 0;
1387 goto out_restart;
1388 }
1389
1390 if (!(hpriv->cap & HOST_CAP_CLO)) {
1391 rc = -EOPNOTSUPP;
1392 goto out_restart;
1393 }
1394
1395 /* perform CLO */
1396 tmp = readl(port_mmio + PORT_CMD);
1397 tmp |= PORT_CMD_CLO;
1398 writel(tmp, port_mmio + PORT_CMD);
1399
1400 rc = 0;
1401 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1402 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1403 if (tmp & PORT_CMD_CLO)
1404 rc = -EIO;
1405
1406 /* restart engine */
1407 out_restart:
1408 hpriv->start_engine(ap);
1409 return rc;
1410}
1411EXPORT_SYMBOL_GPL(ahci_kick_engine);
1412
1413static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1414 struct ata_taskfile *tf, int is_cmd, u16 flags,
1415 unsigned int timeout_msec)
1416{
1417 const u32 cmd_fis_len = 5; /* five dwords */
1418 struct ahci_port_priv *pp = ap->private_data;
1419 void __iomem *port_mmio = ahci_port_base(ap);
1420 u8 *fis = pp->cmd_tbl;
1421 u32 tmp;
1422
1423 /* prep the command */
1424 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1425 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1426
1427 /* set port value for softreset of Port Multiplier */
1428 if (pp->fbs_enabled && pp->fbs_last_dev != pmp) {
1429 tmp = readl(port_mmio + PORT_FBS);
1430 tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1431 tmp |= pmp << PORT_FBS_DEV_OFFSET;
1432 writel(tmp, port_mmio + PORT_FBS);
1433 pp->fbs_last_dev = pmp;
1434 }
1435
1436 /* issue & wait */
1437 writel(1, port_mmio + PORT_CMD_ISSUE);
1438
1439 if (timeout_msec) {
1440 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1441 0x1, 0x1, 1, timeout_msec);
1442 if (tmp & 0x1) {
1443 ahci_kick_engine(ap);
1444 return -EBUSY;
1445 }
1446 } else
1447 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1448
1449 return 0;
1450}
1451
1452int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1453 int pmp, unsigned long deadline,
1454 int (*check_ready)(struct ata_link *link))
1455{
1456 struct ata_port *ap = link->ap;
1457 struct ahci_host_priv *hpriv = ap->host->private_data;
1458 struct ahci_port_priv *pp = ap->private_data;
1459 const char *reason = NULL;
1460 unsigned long now;
1461 unsigned int msecs;
1462 struct ata_taskfile tf;
1463 bool fbs_disabled = false;
1464 int rc;
1465
1466 /* prepare for SRST (AHCI-1.1 10.4.1) */
1467 rc = ahci_kick_engine(ap);
1468 if (rc && rc != -EOPNOTSUPP)
1469 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1470
1471 /*
1472 * According to AHCI-1.2 9.3.9: if FBS is enable, software shall
1473 * clear PxFBS.EN to '0' prior to issuing software reset to devices
1474 * that is attached to port multiplier.
1475 */
1476 if (!ata_is_host_link(link) && pp->fbs_enabled) {
1477 ahci_disable_fbs(ap);
1478 fbs_disabled = true;
1479 }
1480
1481 ata_tf_init(link->device, &tf);
1482
1483 /* issue the first H2D Register FIS */
1484 msecs = 0;
1485 now = jiffies;
1486 if (time_after(deadline, now))
1487 msecs = jiffies_to_msecs(deadline - now);
1488
1489 tf.ctl |= ATA_SRST;
1490 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1491 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1492 rc = -EIO;
1493 reason = "1st FIS failed";
1494 goto fail;
1495 }
1496
1497 /* spec says at least 5us, but be generous and sleep for 1ms */
1498 ata_msleep(ap, 1);
1499
1500 /* issue the second H2D Register FIS */
1501 tf.ctl &= ~ATA_SRST;
1502 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1503
1504 /* wait for link to become ready */
1505 rc = ata_wait_after_reset(link, deadline, check_ready);
1506 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1507 /*
1508 * Workaround for cases where link online status can't
1509 * be trusted. Treat device readiness timeout as link
1510 * offline.
1511 */
1512 ata_link_info(link, "device not ready, treating as offline\n");
1513 *class = ATA_DEV_NONE;
1514 } else if (rc) {
1515 /* link occupied, -ENODEV too is an error */
1516 reason = "device not ready";
1517 goto fail;
1518 } else
1519 *class = ahci_dev_classify(ap);
1520
1521 /* re-enable FBS if disabled before */
1522 if (fbs_disabled)
1523 ahci_enable_fbs(ap);
1524
1525 return 0;
1526
1527 fail:
1528 ata_link_err(link, "softreset failed (%s)\n", reason);
1529 return rc;
1530}
1531
1532int ahci_check_ready(struct ata_link *link)
1533{
1534 void __iomem *port_mmio = ahci_port_base(link->ap);
1535 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1536
1537 return ata_check_ready(status);
1538}
1539EXPORT_SYMBOL_GPL(ahci_check_ready);
1540
1541static int ahci_softreset(struct ata_link *link, unsigned int *class,
1542 unsigned long deadline)
1543{
1544 int pmp = sata_srst_pmp(link);
1545
1546 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1547}
1548EXPORT_SYMBOL_GPL(ahci_do_softreset);
1549
1550static int ahci_bad_pmp_check_ready(struct ata_link *link)
1551{
1552 void __iomem *port_mmio = ahci_port_base(link->ap);
1553 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1554 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1555
1556 /*
1557 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1558 * which can save timeout delay.
1559 */
1560 if (irq_status & PORT_IRQ_BAD_PMP)
1561 return -EIO;
1562
1563 return ata_check_ready(status);
1564}
1565
1566static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1567 unsigned long deadline)
1568{
1569 struct ata_port *ap = link->ap;
1570 void __iomem *port_mmio = ahci_port_base(ap);
1571 int pmp = sata_srst_pmp(link);
1572 int rc;
1573 u32 irq_sts;
1574
1575 rc = ahci_do_softreset(link, class, pmp, deadline,
1576 ahci_bad_pmp_check_ready);
1577
1578 /*
1579 * Soft reset fails with IPMS set when PMP is enabled but
1580 * SATA HDD/ODD is connected to SATA port, do soft reset
1581 * again to port 0.
1582 */
1583 if (rc == -EIO) {
1584 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1585 if (irq_sts & PORT_IRQ_BAD_PMP) {
1586 ata_link_warn(link,
1587 "applying PMP SRST workaround "
1588 "and retrying\n");
1589 rc = ahci_do_softreset(link, class, 0, deadline,
1590 ahci_check_ready);
1591 }
1592 }
1593
1594 return rc;
1595}
1596
1597int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
1598 unsigned long deadline, bool *online)
1599{
1600 const unsigned int *timing = sata_ehc_deb_timing(&link->eh_context);
1601 struct ata_port *ap = link->ap;
1602 struct ahci_port_priv *pp = ap->private_data;
1603 struct ahci_host_priv *hpriv = ap->host->private_data;
1604 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1605 struct ata_taskfile tf;
1606 int rc;
1607
1608 hpriv->stop_engine(ap);
1609
1610 /* clear D2H reception area to properly wait for D2H FIS */
1611 ata_tf_init(link->device, &tf);
1612 tf.status = ATA_BUSY;
1613 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1614
1615 ahci_port_clear_pending_irq(ap);
1616
1617 rc = sata_link_hardreset(link, timing, deadline, online,
1618 ahci_check_ready);
1619
1620 hpriv->start_engine(ap);
1621
1622 if (*online)
1623 *class = ahci_dev_classify(ap);
1624
1625 return rc;
1626}
1627EXPORT_SYMBOL_GPL(ahci_do_hardreset);
1628
1629static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1630 unsigned long deadline)
1631{
1632 bool online;
1633
1634 return ahci_do_hardreset(link, class, deadline, &online);
1635}
1636
1637static void ahci_postreset(struct ata_link *link, unsigned int *class)
1638{
1639 struct ata_port *ap = link->ap;
1640 void __iomem *port_mmio = ahci_port_base(ap);
1641 u32 new_tmp, tmp;
1642
1643 ata_std_postreset(link, class);
1644
1645 /* Make sure port's ATAPI bit is set appropriately */
1646 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1647 if (*class == ATA_DEV_ATAPI)
1648 new_tmp |= PORT_CMD_ATAPI;
1649 else
1650 new_tmp &= ~PORT_CMD_ATAPI;
1651 if (new_tmp != tmp) {
1652 writel(new_tmp, port_mmio + PORT_CMD);
1653 readl(port_mmio + PORT_CMD); /* flush */
1654 }
1655}
1656
1657static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1658{
1659 struct scatterlist *sg;
1660 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1661 unsigned int si;
1662
1663 /*
1664 * Next, the S/G list.
1665 */
1666 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1667 dma_addr_t addr = sg_dma_address(sg);
1668 u32 sg_len = sg_dma_len(sg);
1669
1670 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1671 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1672 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1673 }
1674
1675 return si;
1676}
1677
1678static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1679{
1680 struct ata_port *ap = qc->ap;
1681 struct ahci_port_priv *pp = ap->private_data;
1682
1683 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1684 return ata_std_qc_defer(qc);
1685 else
1686 return sata_pmp_qc_defer_cmd_switch(qc);
1687}
1688
1689static enum ata_completion_errors ahci_qc_prep(struct ata_queued_cmd *qc)
1690{
1691 struct ata_port *ap = qc->ap;
1692 struct ahci_port_priv *pp = ap->private_data;
1693 int is_atapi = ata_is_atapi(qc->tf.protocol);
1694 void *cmd_tbl;
1695 u32 opts;
1696 const u32 cmd_fis_len = 5; /* five dwords */
1697 unsigned int n_elem;
1698
1699 /*
1700 * Fill in command table information. First, the header,
1701 * a SATA Register - Host to Device command FIS.
1702 */
1703 cmd_tbl = pp->cmd_tbl + qc->hw_tag * AHCI_CMD_TBL_SZ;
1704
1705 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1706 if (is_atapi) {
1707 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1708 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1709 }
1710
1711 n_elem = 0;
1712 if (qc->flags & ATA_QCFLAG_DMAMAP)
1713 n_elem = ahci_fill_sg(qc, cmd_tbl);
1714
1715 /*
1716 * Fill in command slot information.
1717 */
1718 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1719 if (qc->tf.flags & ATA_TFLAG_WRITE)
1720 opts |= AHCI_CMD_WRITE;
1721 if (is_atapi)
1722 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1723
1724 ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
1725
1726 return AC_ERR_OK;
1727}
1728
1729static void ahci_fbs_dec_intr(struct ata_port *ap)
1730{
1731 struct ahci_port_priv *pp = ap->private_data;
1732 void __iomem *port_mmio = ahci_port_base(ap);
1733 u32 fbs = readl(port_mmio + PORT_FBS);
1734 int retries = 3;
1735
1736 BUG_ON(!pp->fbs_enabled);
1737
1738 /* time to wait for DEC is not specified by AHCI spec,
1739 * add a retry loop for safety.
1740 */
1741 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1742 fbs = readl(port_mmio + PORT_FBS);
1743 while ((fbs & PORT_FBS_DEC) && retries--) {
1744 udelay(1);
1745 fbs = readl(port_mmio + PORT_FBS);
1746 }
1747
1748 if (fbs & PORT_FBS_DEC)
1749 dev_err(ap->host->dev, "failed to clear device error\n");
1750}
1751
1752static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1753{
1754 struct ahci_host_priv *hpriv = ap->host->private_data;
1755 struct ahci_port_priv *pp = ap->private_data;
1756 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1757 struct ata_link *link = NULL;
1758 struct ata_queued_cmd *active_qc;
1759 struct ata_eh_info *active_ehi;
1760 bool fbs_need_dec = false;
1761 u32 serror;
1762
1763 /* determine active link with error */
1764 if (pp->fbs_enabled) {
1765 void __iomem *port_mmio = ahci_port_base(ap);
1766 u32 fbs = readl(port_mmio + PORT_FBS);
1767 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1768
1769 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
1770 link = &ap->pmp_link[pmp];
1771 fbs_need_dec = true;
1772 }
1773
1774 } else
1775 ata_for_each_link(link, ap, EDGE)
1776 if (ata_link_active(link))
1777 break;
1778
1779 if (!link)
1780 link = &ap->link;
1781
1782 active_qc = ata_qc_from_tag(ap, link->active_tag);
1783 active_ehi = &link->eh_info;
1784
1785 /* record irq stat */
1786 ata_ehi_clear_desc(host_ehi);
1787 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1788
1789 /* AHCI needs SError cleared; otherwise, it might lock up */
1790 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1791 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1792 host_ehi->serror |= serror;
1793
1794 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1795 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1796 irq_stat &= ~PORT_IRQ_IF_ERR;
1797
1798 if (irq_stat & PORT_IRQ_TF_ERR) {
1799 /* If qc is active, charge it; otherwise, the active
1800 * link. There's no active qc on NCQ errors. It will
1801 * be determined by EH by reading log page 10h.
1802 */
1803 if (active_qc)
1804 active_qc->err_mask |= AC_ERR_DEV;
1805 else
1806 active_ehi->err_mask |= AC_ERR_DEV;
1807
1808 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1809 host_ehi->serror &= ~SERR_INTERNAL;
1810 }
1811
1812 if (irq_stat & PORT_IRQ_UNK_FIS) {
1813 u32 *unk = pp->rx_fis + RX_FIS_UNK;
1814
1815 active_ehi->err_mask |= AC_ERR_HSM;
1816 active_ehi->action |= ATA_EH_RESET;
1817 ata_ehi_push_desc(active_ehi,
1818 "unknown FIS %08x %08x %08x %08x" ,
1819 unk[0], unk[1], unk[2], unk[3]);
1820 }
1821
1822 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1823 active_ehi->err_mask |= AC_ERR_HSM;
1824 active_ehi->action |= ATA_EH_RESET;
1825 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1826 }
1827
1828 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1829 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1830 host_ehi->action |= ATA_EH_RESET;
1831 ata_ehi_push_desc(host_ehi, "host bus error");
1832 }
1833
1834 if (irq_stat & PORT_IRQ_IF_ERR) {
1835 if (fbs_need_dec)
1836 active_ehi->err_mask |= AC_ERR_DEV;
1837 else {
1838 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1839 host_ehi->action |= ATA_EH_RESET;
1840 }
1841
1842 ata_ehi_push_desc(host_ehi, "interface fatal error");
1843 }
1844
1845 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1846 ata_ehi_hotplugged(host_ehi);
1847 ata_ehi_push_desc(host_ehi, "%s",
1848 irq_stat & PORT_IRQ_CONNECT ?
1849 "connection status changed" : "PHY RDY changed");
1850 }
1851
1852 /* okay, let's hand over to EH */
1853
1854 if (irq_stat & PORT_IRQ_FREEZE)
1855 ata_port_freeze(ap);
1856 else if (fbs_need_dec) {
1857 ata_link_abort(link);
1858 ahci_fbs_dec_intr(ap);
1859 } else
1860 ata_port_abort(ap);
1861}
1862
1863static void ahci_qc_complete(struct ata_port *ap, void __iomem *port_mmio)
1864{
1865 struct ata_eh_info *ehi = &ap->link.eh_info;
1866 struct ahci_port_priv *pp = ap->private_data;
1867 u32 qc_active = 0;
1868 int rc;
1869
1870 /*
1871 * pp->active_link is not reliable once FBS is enabled, both
1872 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1873 * NCQ and non-NCQ commands may be in flight at the same time.
1874 */
1875 if (pp->fbs_enabled) {
1876 if (ap->qc_active) {
1877 qc_active = readl(port_mmio + PORT_SCR_ACT);
1878 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1879 }
1880 } else {
1881 /* pp->active_link is valid iff any command is in flight */
1882 if (ap->qc_active && pp->active_link->sactive)
1883 qc_active = readl(port_mmio + PORT_SCR_ACT);
1884 else
1885 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1886 }
1887
1888 rc = ata_qc_complete_multiple(ap, qc_active);
1889 if (unlikely(rc < 0 && !(ap->pflags & ATA_PFLAG_RESETTING))) {
1890 ehi->err_mask |= AC_ERR_HSM;
1891 ehi->action |= ATA_EH_RESET;
1892 ata_port_freeze(ap);
1893 }
1894}
1895
1896static void ahci_handle_port_interrupt(struct ata_port *ap,
1897 void __iomem *port_mmio, u32 status)
1898{
1899 struct ahci_port_priv *pp = ap->private_data;
1900 struct ahci_host_priv *hpriv = ap->host->private_data;
1901
1902 /* ignore BAD_PMP while resetting */
1903 if (unlikely(ap->pflags & ATA_PFLAG_RESETTING))
1904 status &= ~PORT_IRQ_BAD_PMP;
1905
1906 if (sata_lpm_ignore_phy_events(&ap->link)) {
1907 status &= ~PORT_IRQ_PHYRDY;
1908 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1909 }
1910
1911 if (unlikely(status & PORT_IRQ_ERROR)) {
1912 /*
1913 * Before getting the error notification, we may have
1914 * received SDB FISes notifying successful completions.
1915 * Handle these first and then handle the error.
1916 */
1917 ahci_qc_complete(ap, port_mmio);
1918 ahci_error_intr(ap, status);
1919 return;
1920 }
1921
1922 if (status & PORT_IRQ_SDB_FIS) {
1923 /* If SNotification is available, leave notification
1924 * handling to sata_async_notification(). If not,
1925 * emulate it by snooping SDB FIS RX area.
1926 *
1927 * Snooping FIS RX area is probably cheaper than
1928 * poking SNotification but some constrollers which
1929 * implement SNotification, ICH9 for example, don't
1930 * store AN SDB FIS into receive area.
1931 */
1932 if (hpriv->cap & HOST_CAP_SNTF)
1933 sata_async_notification(ap);
1934 else {
1935 /* If the 'N' bit in word 0 of the FIS is set,
1936 * we just received asynchronous notification.
1937 * Tell libata about it.
1938 *
1939 * Lack of SNotification should not appear in
1940 * ahci 1.2, so the workaround is unnecessary
1941 * when FBS is enabled.
1942 */
1943 if (pp->fbs_enabled)
1944 WARN_ON_ONCE(1);
1945 else {
1946 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1947 u32 f0 = le32_to_cpu(f[0]);
1948 if (f0 & (1 << 15))
1949 sata_async_notification(ap);
1950 }
1951 }
1952 }
1953
1954 /* Handle completed commands */
1955 ahci_qc_complete(ap, port_mmio);
1956}
1957
1958static void ahci_port_intr(struct ata_port *ap)
1959{
1960 void __iomem *port_mmio = ahci_port_base(ap);
1961 u32 status;
1962
1963 status = readl(port_mmio + PORT_IRQ_STAT);
1964 writel(status, port_mmio + PORT_IRQ_STAT);
1965
1966 ahci_handle_port_interrupt(ap, port_mmio, status);
1967}
1968
1969static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
1970{
1971 struct ata_port *ap = dev_instance;
1972 void __iomem *port_mmio = ahci_port_base(ap);
1973 u32 status;
1974
1975 status = readl(port_mmio + PORT_IRQ_STAT);
1976 writel(status, port_mmio + PORT_IRQ_STAT);
1977
1978 spin_lock(ap->lock);
1979 ahci_handle_port_interrupt(ap, port_mmio, status);
1980 spin_unlock(ap->lock);
1981
1982 return IRQ_HANDLED;
1983}
1984
1985u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
1986{
1987 unsigned int i, handled = 0;
1988
1989 for (i = 0; i < host->n_ports; i++) {
1990 struct ata_port *ap;
1991
1992 if (!(irq_masked & (1 << i)))
1993 continue;
1994
1995 ap = host->ports[i];
1996 if (ap) {
1997 ahci_port_intr(ap);
1998 } else {
1999 if (ata_ratelimit())
2000 dev_warn(host->dev,
2001 "interrupt on disabled port %u\n", i);
2002 }
2003
2004 handled = 1;
2005 }
2006
2007 return handled;
2008}
2009EXPORT_SYMBOL_GPL(ahci_handle_port_intr);
2010
2011static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
2012{
2013 struct ata_host *host = dev_instance;
2014 struct ahci_host_priv *hpriv;
2015 unsigned int rc = 0;
2016 void __iomem *mmio;
2017 u32 irq_stat, irq_masked;
2018
2019 hpriv = host->private_data;
2020 mmio = hpriv->mmio;
2021
2022 /* sigh. 0xffffffff is a valid return from h/w */
2023 irq_stat = readl(mmio + HOST_IRQ_STAT);
2024 if (!irq_stat)
2025 return IRQ_NONE;
2026
2027 irq_masked = irq_stat & hpriv->port_map;
2028
2029 spin_lock(&host->lock);
2030
2031 rc = ahci_handle_port_intr(host, irq_masked);
2032
2033 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
2034 * it should be cleared after all the port events are cleared;
2035 * otherwise, it will raise a spurious interrupt after each
2036 * valid one. Please read section 10.6.2 of ahci 1.1 for more
2037 * information.
2038 *
2039 * Also, use the unmasked value to clear interrupt as spurious
2040 * pending event on a dummy port might cause screaming IRQ.
2041 */
2042 writel(irq_stat, mmio + HOST_IRQ_STAT);
2043
2044 spin_unlock(&host->lock);
2045
2046 return IRQ_RETVAL(rc);
2047}
2048
2049unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
2050{
2051 struct ata_port *ap = qc->ap;
2052 void __iomem *port_mmio = ahci_port_base(ap);
2053 struct ahci_port_priv *pp = ap->private_data;
2054
2055 /* Keep track of the currently active link. It will be used
2056 * in completion path to determine whether NCQ phase is in
2057 * progress.
2058 */
2059 pp->active_link = qc->dev->link;
2060
2061 if (ata_is_ncq(qc->tf.protocol))
2062 writel(1 << qc->hw_tag, port_mmio + PORT_SCR_ACT);
2063
2064 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
2065 u32 fbs = readl(port_mmio + PORT_FBS);
2066 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
2067 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
2068 writel(fbs, port_mmio + PORT_FBS);
2069 pp->fbs_last_dev = qc->dev->link->pmp;
2070 }
2071
2072 writel(1 << qc->hw_tag, port_mmio + PORT_CMD_ISSUE);
2073
2074 ahci_sw_activity(qc->dev->link);
2075
2076 return 0;
2077}
2078EXPORT_SYMBOL_GPL(ahci_qc_issue);
2079
2080static void ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
2081{
2082 struct ahci_port_priv *pp = qc->ap->private_data;
2083 u8 *rx_fis = pp->rx_fis;
2084
2085 /*
2086 * rtf may already be filled (e.g. for successful NCQ commands).
2087 * If that is the case, we have nothing to do.
2088 */
2089 if (qc->flags & ATA_QCFLAG_RTF_FILLED)
2090 return;
2091
2092 if (pp->fbs_enabled)
2093 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
2094
2095 /*
2096 * After a successful execution of an ATA PIO data-in command,
2097 * the device doesn't send D2H Reg FIS to update the TF and
2098 * the host should take TF and E_Status from the preceding PIO
2099 * Setup FIS.
2100 */
2101 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
2102 !(qc->flags & ATA_QCFLAG_EH)) {
2103 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
2104 qc->result_tf.status = (rx_fis + RX_FIS_PIO_SETUP)[15];
2105 qc->flags |= ATA_QCFLAG_RTF_FILLED;
2106 return;
2107 }
2108
2109 /*
2110 * For NCQ commands, we never get a D2H FIS, so reading the D2H Register
2111 * FIS area of the Received FIS Structure (which contains a copy of the
2112 * last D2H FIS received) will contain an outdated status code.
2113 * For NCQ commands, we instead get a SDB FIS, so read the SDB FIS area
2114 * instead. However, the SDB FIS does not contain the LBA, so we can't
2115 * use the ata_tf_from_fis() helper.
2116 */
2117 if (ata_is_ncq(qc->tf.protocol)) {
2118 const u8 *fis = rx_fis + RX_FIS_SDB;
2119
2120 /*
2121 * Successful NCQ commands have been filled already.
2122 * A failed NCQ command will read the status here.
2123 * (Note that a failed NCQ command will get a more specific
2124 * error when reading the NCQ Command Error log.)
2125 */
2126 qc->result_tf.status = fis[2];
2127 qc->result_tf.error = fis[3];
2128 qc->flags |= ATA_QCFLAG_RTF_FILLED;
2129 return;
2130 }
2131
2132 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
2133 qc->flags |= ATA_QCFLAG_RTF_FILLED;
2134}
2135
2136static void ahci_qc_ncq_fill_rtf(struct ata_port *ap, u64 done_mask)
2137{
2138 struct ahci_port_priv *pp = ap->private_data;
2139 const u8 *fis;
2140
2141 /* No outstanding commands. */
2142 if (!ap->qc_active)
2143 return;
2144
2145 /*
2146 * FBS not enabled, so read status and error once, since they are shared
2147 * for all QCs.
2148 */
2149 if (!pp->fbs_enabled) {
2150 u8 status, error;
2151
2152 /* No outstanding NCQ commands. */
2153 if (!pp->active_link->sactive)
2154 return;
2155
2156 fis = pp->rx_fis + RX_FIS_SDB;
2157 status = fis[2];
2158 error = fis[3];
2159
2160 while (done_mask) {
2161 struct ata_queued_cmd *qc;
2162 unsigned int tag = __ffs64(done_mask);
2163
2164 qc = ata_qc_from_tag(ap, tag);
2165 if (qc && ata_is_ncq(qc->tf.protocol)) {
2166 qc->result_tf.status = status;
2167 qc->result_tf.error = error;
2168 qc->flags |= ATA_QCFLAG_RTF_FILLED;
2169 }
2170 done_mask &= ~(1ULL << tag);
2171 }
2172
2173 return;
2174 }
2175
2176 /*
2177 * FBS enabled, so read the status and error for each QC, since the QCs
2178 * can belong to different PMP links. (Each PMP link has its own FIS
2179 * Receive Area.)
2180 */
2181 while (done_mask) {
2182 struct ata_queued_cmd *qc;
2183 unsigned int tag = __ffs64(done_mask);
2184
2185 qc = ata_qc_from_tag(ap, tag);
2186 if (qc && ata_is_ncq(qc->tf.protocol)) {
2187 fis = pp->rx_fis;
2188 fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
2189 fis += RX_FIS_SDB;
2190 qc->result_tf.status = fis[2];
2191 qc->result_tf.error = fis[3];
2192 qc->flags |= ATA_QCFLAG_RTF_FILLED;
2193 }
2194 done_mask &= ~(1ULL << tag);
2195 }
2196}
2197
2198static void ahci_freeze(struct ata_port *ap)
2199{
2200 void __iomem *port_mmio = ahci_port_base(ap);
2201
2202 /* turn IRQ off */
2203 writel(0, port_mmio + PORT_IRQ_MASK);
2204}
2205
2206static void ahci_thaw(struct ata_port *ap)
2207{
2208 struct ahci_host_priv *hpriv = ap->host->private_data;
2209 void __iomem *mmio = hpriv->mmio;
2210 void __iomem *port_mmio = ahci_port_base(ap);
2211 u32 tmp;
2212 struct ahci_port_priv *pp = ap->private_data;
2213
2214 /* clear IRQ */
2215 tmp = readl(port_mmio + PORT_IRQ_STAT);
2216 writel(tmp, port_mmio + PORT_IRQ_STAT);
2217 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
2218
2219 /* turn IRQ back on */
2220 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2221}
2222
2223void ahci_error_handler(struct ata_port *ap)
2224{
2225 struct ahci_host_priv *hpriv = ap->host->private_data;
2226
2227 if (!ata_port_is_frozen(ap)) {
2228 /* restart engine */
2229 hpriv->stop_engine(ap);
2230 hpriv->start_engine(ap);
2231 }
2232
2233 sata_pmp_error_handler(ap);
2234
2235 if (!ata_dev_enabled(ap->link.device))
2236 hpriv->stop_engine(ap);
2237}
2238EXPORT_SYMBOL_GPL(ahci_error_handler);
2239
2240static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
2241{
2242 struct ata_port *ap = qc->ap;
2243
2244 /* make DMA engine forget about the failed command */
2245 if (qc->flags & ATA_QCFLAG_EH)
2246 ahci_kick_engine(ap);
2247}
2248
2249static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2250{
2251 struct ahci_host_priv *hpriv = ap->host->private_data;
2252 void __iomem *port_mmio = ahci_port_base(ap);
2253 struct ata_device *dev = ap->link.device;
2254 u32 devslp, dm, dito, mdat, deto, dito_conf;
2255 int rc;
2256 unsigned int err_mask;
2257
2258 devslp = readl(port_mmio + PORT_DEVSLP);
2259 if (!(devslp & PORT_DEVSLP_DSP)) {
2260 dev_info(ap->host->dev, "port does not support device sleep\n");
2261 return;
2262 }
2263
2264 /* disable device sleep */
2265 if (!sleep) {
2266 if (devslp & PORT_DEVSLP_ADSE) {
2267 writel(devslp & ~PORT_DEVSLP_ADSE,
2268 port_mmio + PORT_DEVSLP);
2269 err_mask = ata_dev_set_feature(dev,
2270 SETFEATURES_SATA_DISABLE,
2271 SATA_DEVSLP);
2272 if (err_mask && err_mask != AC_ERR_DEV)
2273 ata_dev_warn(dev, "failed to disable DEVSLP\n");
2274 }
2275 return;
2276 }
2277
2278 dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2279 dito = devslp_idle_timeout / (dm + 1);
2280 if (dito > 0x3ff)
2281 dito = 0x3ff;
2282
2283 dito_conf = (devslp >> PORT_DEVSLP_DITO_OFFSET) & 0x3FF;
2284
2285 /* device sleep was already enabled and same dito */
2286 if ((devslp & PORT_DEVSLP_ADSE) && (dito_conf == dito))
2287 return;
2288
2289 /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2290 rc = hpriv->stop_engine(ap);
2291 if (rc)
2292 return;
2293
2294 /* Use the nominal value 10 ms if the read MDAT is zero,
2295 * the nominal value of DETO is 20 ms.
2296 */
2297 if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2298 ATA_LOG_DEVSLP_VALID_MASK) {
2299 mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2300 ATA_LOG_DEVSLP_MDAT_MASK;
2301 if (!mdat)
2302 mdat = 10;
2303 deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2304 if (!deto)
2305 deto = 20;
2306 } else {
2307 mdat = 10;
2308 deto = 20;
2309 }
2310
2311 /* Make dito, mdat, deto bits to 0s */
2312 devslp &= ~GENMASK_ULL(24, 2);
2313 devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2314 (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2315 (deto << PORT_DEVSLP_DETO_OFFSET) |
2316 PORT_DEVSLP_ADSE);
2317 writel(devslp, port_mmio + PORT_DEVSLP);
2318
2319 hpriv->start_engine(ap);
2320
2321 /* enable device sleep feature for the drive */
2322 err_mask = ata_dev_set_feature(dev,
2323 SETFEATURES_SATA_ENABLE,
2324 SATA_DEVSLP);
2325 if (err_mask && err_mask != AC_ERR_DEV)
2326 ata_dev_warn(dev, "failed to enable DEVSLP\n");
2327}
2328
2329static void ahci_enable_fbs(struct ata_port *ap)
2330{
2331 struct ahci_host_priv *hpriv = ap->host->private_data;
2332 struct ahci_port_priv *pp = ap->private_data;
2333 void __iomem *port_mmio = ahci_port_base(ap);
2334 u32 fbs;
2335 int rc;
2336
2337 if (!pp->fbs_supported)
2338 return;
2339
2340 fbs = readl(port_mmio + PORT_FBS);
2341 if (fbs & PORT_FBS_EN) {
2342 pp->fbs_enabled = true;
2343 pp->fbs_last_dev = -1; /* initialization */
2344 return;
2345 }
2346
2347 rc = hpriv->stop_engine(ap);
2348 if (rc)
2349 return;
2350
2351 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2352 fbs = readl(port_mmio + PORT_FBS);
2353 if (fbs & PORT_FBS_EN) {
2354 dev_info(ap->host->dev, "FBS is enabled\n");
2355 pp->fbs_enabled = true;
2356 pp->fbs_last_dev = -1; /* initialization */
2357 } else
2358 dev_err(ap->host->dev, "Failed to enable FBS\n");
2359
2360 hpriv->start_engine(ap);
2361}
2362
2363static void ahci_disable_fbs(struct ata_port *ap)
2364{
2365 struct ahci_host_priv *hpriv = ap->host->private_data;
2366 struct ahci_port_priv *pp = ap->private_data;
2367 void __iomem *port_mmio = ahci_port_base(ap);
2368 u32 fbs;
2369 int rc;
2370
2371 if (!pp->fbs_supported)
2372 return;
2373
2374 fbs = readl(port_mmio + PORT_FBS);
2375 if ((fbs & PORT_FBS_EN) == 0) {
2376 pp->fbs_enabled = false;
2377 return;
2378 }
2379
2380 rc = hpriv->stop_engine(ap);
2381 if (rc)
2382 return;
2383
2384 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2385 fbs = readl(port_mmio + PORT_FBS);
2386 if (fbs & PORT_FBS_EN)
2387 dev_err(ap->host->dev, "Failed to disable FBS\n");
2388 else {
2389 dev_info(ap->host->dev, "FBS is disabled\n");
2390 pp->fbs_enabled = false;
2391 }
2392
2393 hpriv->start_engine(ap);
2394}
2395
2396static void ahci_pmp_attach(struct ata_port *ap)
2397{
2398 void __iomem *port_mmio = ahci_port_base(ap);
2399 struct ahci_port_priv *pp = ap->private_data;
2400 u32 cmd;
2401
2402 cmd = readl(port_mmio + PORT_CMD);
2403 cmd |= PORT_CMD_PMP;
2404 writel(cmd, port_mmio + PORT_CMD);
2405
2406 ahci_enable_fbs(ap);
2407
2408 pp->intr_mask |= PORT_IRQ_BAD_PMP;
2409
2410 /*
2411 * We must not change the port interrupt mask register if the
2412 * port is marked frozen, the value in pp->intr_mask will be
2413 * restored later when the port is thawed.
2414 *
2415 * Note that during initialization, the port is marked as
2416 * frozen since the irq handler is not yet registered.
2417 */
2418 if (!ata_port_is_frozen(ap))
2419 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2420}
2421
2422static void ahci_pmp_detach(struct ata_port *ap)
2423{
2424 void __iomem *port_mmio = ahci_port_base(ap);
2425 struct ahci_port_priv *pp = ap->private_data;
2426 u32 cmd;
2427
2428 ahci_disable_fbs(ap);
2429
2430 cmd = readl(port_mmio + PORT_CMD);
2431 cmd &= ~PORT_CMD_PMP;
2432 writel(cmd, port_mmio + PORT_CMD);
2433
2434 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2435
2436 /* see comment above in ahci_pmp_attach() */
2437 if (!ata_port_is_frozen(ap))
2438 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2439}
2440
2441int ahci_port_resume(struct ata_port *ap)
2442{
2443 ahci_rpm_get_port(ap);
2444
2445 ahci_power_up(ap);
2446 ahci_start_port(ap);
2447
2448 if (sata_pmp_attached(ap))
2449 ahci_pmp_attach(ap);
2450 else
2451 ahci_pmp_detach(ap);
2452
2453 return 0;
2454}
2455EXPORT_SYMBOL_GPL(ahci_port_resume);
2456
2457#ifdef CONFIG_PM
2458static void ahci_handle_s2idle(struct ata_port *ap)
2459{
2460 void __iomem *port_mmio = ahci_port_base(ap);
2461 u32 devslp;
2462
2463 if (pm_suspend_via_firmware())
2464 return;
2465 devslp = readl(port_mmio + PORT_DEVSLP);
2466 if ((devslp & PORT_DEVSLP_ADSE))
2467 ata_msleep(ap, devslp_idle_timeout);
2468}
2469
2470static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2471{
2472 const char *emsg = NULL;
2473 int rc;
2474
2475 rc = ahci_deinit_port(ap, &emsg);
2476 if (rc == 0)
2477 ahci_power_down(ap);
2478 else {
2479 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2480 ata_port_freeze(ap);
2481 }
2482
2483 if (acpi_storage_d3(ap->host->dev))
2484 ahci_handle_s2idle(ap);
2485
2486 ahci_rpm_put_port(ap);
2487 return rc;
2488}
2489#endif
2490
2491static int ahci_port_start(struct ata_port *ap)
2492{
2493 struct ahci_host_priv *hpriv = ap->host->private_data;
2494 struct device *dev = ap->host->dev;
2495 struct ahci_port_priv *pp;
2496 void *mem;
2497 dma_addr_t mem_dma;
2498 size_t dma_sz, rx_fis_sz;
2499
2500 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2501 if (!pp)
2502 return -ENOMEM;
2503
2504 if (ap->host->n_ports > 1) {
2505 pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
2506 if (!pp->irq_desc) {
2507 devm_kfree(dev, pp);
2508 return -ENOMEM;
2509 }
2510 snprintf(pp->irq_desc, 8,
2511 "%s%d", dev_driver_string(dev), ap->port_no);
2512 }
2513
2514 /* check FBS capability */
2515 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2516 void __iomem *port_mmio = ahci_port_base(ap);
2517 u32 cmd = readl(port_mmio + PORT_CMD);
2518 if (cmd & PORT_CMD_FBSCP)
2519 pp->fbs_supported = true;
2520 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2521 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2522 ap->port_no);
2523 pp->fbs_supported = true;
2524 } else
2525 dev_warn(dev, "port %d is not capable of FBS\n",
2526 ap->port_no);
2527 }
2528
2529 if (pp->fbs_supported) {
2530 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2531 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2532 } else {
2533 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2534 rx_fis_sz = AHCI_RX_FIS_SZ;
2535 }
2536
2537 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2538 if (!mem)
2539 return -ENOMEM;
2540
2541 /*
2542 * First item in chunk of DMA memory: 32-slot command table,
2543 * 32 bytes each in size
2544 */
2545 pp->cmd_slot = mem;
2546 pp->cmd_slot_dma = mem_dma;
2547
2548 mem += AHCI_CMD_SLOT_SZ;
2549 mem_dma += AHCI_CMD_SLOT_SZ;
2550
2551 /*
2552 * Second item: Received-FIS area
2553 */
2554 pp->rx_fis = mem;
2555 pp->rx_fis_dma = mem_dma;
2556
2557 mem += rx_fis_sz;
2558 mem_dma += rx_fis_sz;
2559
2560 /*
2561 * Third item: data area for storing a single command
2562 * and its scatter-gather table
2563 */
2564 pp->cmd_tbl = mem;
2565 pp->cmd_tbl_dma = mem_dma;
2566
2567 /*
2568 * Save off initial list of interrupts to be enabled.
2569 * This could be changed later
2570 */
2571 pp->intr_mask = DEF_PORT_IRQ;
2572
2573 /*
2574 * Switch to per-port locking in case each port has its own MSI vector.
2575 */
2576 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2577 spin_lock_init(&pp->lock);
2578 ap->lock = &pp->lock;
2579 }
2580
2581 ap->private_data = pp;
2582
2583 /* engage engines, captain */
2584 return ahci_port_resume(ap);
2585}
2586
2587static void ahci_port_stop(struct ata_port *ap)
2588{
2589 const char *emsg = NULL;
2590 struct ahci_host_priv *hpriv = ap->host->private_data;
2591 void __iomem *host_mmio = hpriv->mmio;
2592 int rc;
2593
2594 /* de-initialize port */
2595 rc = ahci_deinit_port(ap, &emsg);
2596 if (rc)
2597 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2598
2599 /*
2600 * Clear GHC.IS to prevent stuck INTx after disabling MSI and
2601 * re-enabling INTx.
2602 */
2603 writel(1 << ap->port_no, host_mmio + HOST_IRQ_STAT);
2604
2605 ahci_rpm_put_port(ap);
2606}
2607
2608void ahci_print_info(struct ata_host *host, const char *scc_s)
2609{
2610 struct ahci_host_priv *hpriv = host->private_data;
2611 u32 vers, cap, cap2, impl, speed;
2612 const char *speed_s;
2613
2614 vers = hpriv->version;
2615 cap = hpriv->cap;
2616 cap2 = hpriv->cap2;
2617 impl = hpriv->port_map;
2618
2619 speed = (cap >> 20) & 0xf;
2620 if (speed == 1)
2621 speed_s = "1.5";
2622 else if (speed == 2)
2623 speed_s = "3";
2624 else if (speed == 3)
2625 speed_s = "6";
2626 else
2627 speed_s = "?";
2628
2629 dev_info(host->dev,
2630 "AHCI %02x%02x.%02x%02x "
2631 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2632 ,
2633
2634 (vers >> 24) & 0xff,
2635 (vers >> 16) & 0xff,
2636 (vers >> 8) & 0xff,
2637 vers & 0xff,
2638
2639 ((cap >> 8) & 0x1f) + 1,
2640 (cap & 0x1f) + 1,
2641 speed_s,
2642 impl,
2643 scc_s);
2644
2645 dev_info(host->dev,
2646 "flags: "
2647 "%s%s%s%s%s%s%s"
2648 "%s%s%s%s%s%s%s"
2649 "%s%s%s%s%s%s%s"
2650 "%s%s\n"
2651 ,
2652
2653 cap & HOST_CAP_64 ? "64bit " : "",
2654 cap & HOST_CAP_NCQ ? "ncq " : "",
2655 cap & HOST_CAP_SNTF ? "sntf " : "",
2656 cap & HOST_CAP_MPS ? "ilck " : "",
2657 cap & HOST_CAP_SSS ? "stag " : "",
2658 cap & HOST_CAP_ALPM ? "pm " : "",
2659 cap & HOST_CAP_LED ? "led " : "",
2660 cap & HOST_CAP_CLO ? "clo " : "",
2661 cap & HOST_CAP_ONLY ? "only " : "",
2662 cap & HOST_CAP_PMP ? "pmp " : "",
2663 cap & HOST_CAP_FBS ? "fbs " : "",
2664 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2665 cap & HOST_CAP_SSC ? "slum " : "",
2666 cap & HOST_CAP_PART ? "part " : "",
2667 cap & HOST_CAP_CCC ? "ccc " : "",
2668 cap & HOST_CAP_EMS ? "ems " : "",
2669 cap & HOST_CAP_SXS ? "sxs " : "",
2670 cap2 & HOST_CAP2_DESO ? "deso " : "",
2671 cap2 & HOST_CAP2_SADM ? "sadm " : "",
2672 cap2 & HOST_CAP2_SDS ? "sds " : "",
2673 cap2 & HOST_CAP2_APST ? "apst " : "",
2674 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2675 cap2 & HOST_CAP2_BOH ? "boh " : ""
2676 );
2677}
2678EXPORT_SYMBOL_GPL(ahci_print_info);
2679
2680void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2681 struct ata_port_info *pi)
2682{
2683 u8 messages;
2684 void __iomem *mmio = hpriv->mmio;
2685 u32 em_loc = readl(mmio + HOST_EM_LOC);
2686 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2687
2688 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2689 return;
2690
2691 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2692
2693 if (messages) {
2694 /* store em_loc */
2695 hpriv->em_loc = ((em_loc >> 16) * 4);
2696 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2697 hpriv->em_msg_type = messages;
2698 pi->flags |= ATA_FLAG_EM;
2699 if (!(em_ctl & EM_CTL_ALHD))
2700 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2701 }
2702}
2703EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2704
2705static int ahci_host_activate_multi_irqs(struct ata_host *host,
2706 const struct scsi_host_template *sht)
2707{
2708 struct ahci_host_priv *hpriv = host->private_data;
2709 int i, rc;
2710
2711 rc = ata_host_start(host);
2712 if (rc)
2713 return rc;
2714 /*
2715 * Requests IRQs according to AHCI-1.1 when multiple MSIs were
2716 * allocated. That is one MSI per port, starting from @irq.
2717 */
2718 for (i = 0; i < host->n_ports; i++) {
2719 struct ahci_port_priv *pp = host->ports[i]->private_data;
2720 int irq = hpriv->get_irq_vector(host, i);
2721
2722 /* Do not receive interrupts sent by dummy ports */
2723 if (!pp) {
2724 disable_irq(irq);
2725 continue;
2726 }
2727
2728 rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
2729 0, pp->irq_desc, host->ports[i]);
2730
2731 if (rc)
2732 return rc;
2733 ata_port_desc_misc(host->ports[i], irq);
2734 }
2735
2736 return ata_host_register(host, sht);
2737}
2738
2739/**
2740 * ahci_host_activate - start AHCI host, request IRQs and register it
2741 * @host: target ATA host
2742 * @sht: scsi_host_template to use when registering the host
2743 *
2744 * LOCKING:
2745 * Inherited from calling layer (may sleep).
2746 *
2747 * RETURNS:
2748 * 0 on success, -errno otherwise.
2749 */
2750int ahci_host_activate(struct ata_host *host, const struct scsi_host_template *sht)
2751{
2752 struct ahci_host_priv *hpriv = host->private_data;
2753 int irq = hpriv->irq;
2754 int rc;
2755
2756 if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
2757 if (hpriv->irq_handler &&
2758 hpriv->irq_handler != ahci_single_level_irq_intr)
2759 dev_warn(host->dev,
2760 "both AHCI_HFLAG_MULTI_MSI flag set and custom irq handler implemented\n");
2761 if (!hpriv->get_irq_vector) {
2762 dev_err(host->dev,
2763 "AHCI_HFLAG_MULTI_MSI requires ->get_irq_vector!\n");
2764 return -EIO;
2765 }
2766
2767 rc = ahci_host_activate_multi_irqs(host, sht);
2768 } else {
2769 rc = ata_host_activate(host, irq, hpriv->irq_handler,
2770 IRQF_SHARED, sht);
2771 }
2772
2773
2774 return rc;
2775}
2776EXPORT_SYMBOL_GPL(ahci_host_activate);
2777
2778MODULE_AUTHOR("Jeff Garzik");
2779MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2780MODULE_LICENSE("GPL");
1/*
2 * libahci.c - Common AHCI SATA low-level routines
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2004-2005 Red Hat, Inc.
9 *
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 *
26 * libata documentation is available via 'make {ps|pdf}docs',
27 * as Documentation/DocBook/libata.*
28 *
29 * AHCI hardware documentation:
30 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
31 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
32 *
33 */
34
35#include <linux/kernel.h>
36#include <linux/gfp.h>
37#include <linux/module.h>
38#include <linux/init.h>
39#include <linux/blkdev.h>
40#include <linux/delay.h>
41#include <linux/interrupt.h>
42#include <linux/dma-mapping.h>
43#include <linux/device.h>
44#include <scsi/scsi_host.h>
45#include <scsi/scsi_cmnd.h>
46#include <linux/libata.h>
47#include "ahci.h"
48
49static int ahci_skip_host_reset;
50int ahci_ignore_sss;
51EXPORT_SYMBOL_GPL(ahci_ignore_sss);
52
53module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
54MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
55
56module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
57MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
58
59static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
60 unsigned hints);
61static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
62static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
63 size_t size);
64static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
65 ssize_t size);
66
67
68
69static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
70static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
71static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
72static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
73static int ahci_port_start(struct ata_port *ap);
74static void ahci_port_stop(struct ata_port *ap);
75static void ahci_qc_prep(struct ata_queued_cmd *qc);
76static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
77static void ahci_freeze(struct ata_port *ap);
78static void ahci_thaw(struct ata_port *ap);
79static void ahci_enable_fbs(struct ata_port *ap);
80static void ahci_disable_fbs(struct ata_port *ap);
81static void ahci_pmp_attach(struct ata_port *ap);
82static void ahci_pmp_detach(struct ata_port *ap);
83static int ahci_softreset(struct ata_link *link, unsigned int *class,
84 unsigned long deadline);
85static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
86 unsigned long deadline);
87static int ahci_hardreset(struct ata_link *link, unsigned int *class,
88 unsigned long deadline);
89static void ahci_postreset(struct ata_link *link, unsigned int *class);
90static void ahci_error_handler(struct ata_port *ap);
91static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
92static void ahci_dev_config(struct ata_device *dev);
93#ifdef CONFIG_PM
94static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
95#endif
96static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
97static ssize_t ahci_activity_store(struct ata_device *dev,
98 enum sw_activity val);
99static void ahci_init_sw_activity(struct ata_link *link);
100
101static ssize_t ahci_show_host_caps(struct device *dev,
102 struct device_attribute *attr, char *buf);
103static ssize_t ahci_show_host_cap2(struct device *dev,
104 struct device_attribute *attr, char *buf);
105static ssize_t ahci_show_host_version(struct device *dev,
106 struct device_attribute *attr, char *buf);
107static ssize_t ahci_show_port_cmd(struct device *dev,
108 struct device_attribute *attr, char *buf);
109static ssize_t ahci_read_em_buffer(struct device *dev,
110 struct device_attribute *attr, char *buf);
111static ssize_t ahci_store_em_buffer(struct device *dev,
112 struct device_attribute *attr,
113 const char *buf, size_t size);
114static ssize_t ahci_show_em_supported(struct device *dev,
115 struct device_attribute *attr, char *buf);
116
117static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
118static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
119static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
120static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
121static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
122 ahci_read_em_buffer, ahci_store_em_buffer);
123static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
124
125struct device_attribute *ahci_shost_attrs[] = {
126 &dev_attr_link_power_management_policy,
127 &dev_attr_em_message_type,
128 &dev_attr_em_message,
129 &dev_attr_ahci_host_caps,
130 &dev_attr_ahci_host_cap2,
131 &dev_attr_ahci_host_version,
132 &dev_attr_ahci_port_cmd,
133 &dev_attr_em_buffer,
134 &dev_attr_em_message_supported,
135 NULL
136};
137EXPORT_SYMBOL_GPL(ahci_shost_attrs);
138
139struct device_attribute *ahci_sdev_attrs[] = {
140 &dev_attr_sw_activity,
141 &dev_attr_unload_heads,
142 NULL
143};
144EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
145
146struct ata_port_operations ahci_ops = {
147 .inherits = &sata_pmp_port_ops,
148
149 .qc_defer = ahci_pmp_qc_defer,
150 .qc_prep = ahci_qc_prep,
151 .qc_issue = ahci_qc_issue,
152 .qc_fill_rtf = ahci_qc_fill_rtf,
153
154 .freeze = ahci_freeze,
155 .thaw = ahci_thaw,
156 .softreset = ahci_softreset,
157 .hardreset = ahci_hardreset,
158 .postreset = ahci_postreset,
159 .pmp_softreset = ahci_softreset,
160 .error_handler = ahci_error_handler,
161 .post_internal_cmd = ahci_post_internal_cmd,
162 .dev_config = ahci_dev_config,
163
164 .scr_read = ahci_scr_read,
165 .scr_write = ahci_scr_write,
166 .pmp_attach = ahci_pmp_attach,
167 .pmp_detach = ahci_pmp_detach,
168
169 .set_lpm = ahci_set_lpm,
170 .em_show = ahci_led_show,
171 .em_store = ahci_led_store,
172 .sw_activity_show = ahci_activity_show,
173 .sw_activity_store = ahci_activity_store,
174#ifdef CONFIG_PM
175 .port_suspend = ahci_port_suspend,
176 .port_resume = ahci_port_resume,
177#endif
178 .port_start = ahci_port_start,
179 .port_stop = ahci_port_stop,
180};
181EXPORT_SYMBOL_GPL(ahci_ops);
182
183struct ata_port_operations ahci_pmp_retry_srst_ops = {
184 .inherits = &ahci_ops,
185 .softreset = ahci_pmp_retry_softreset,
186};
187EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
188
189int ahci_em_messages = 1;
190EXPORT_SYMBOL_GPL(ahci_em_messages);
191module_param(ahci_em_messages, int, 0444);
192/* add other LED protocol types when they become supported */
193MODULE_PARM_DESC(ahci_em_messages,
194 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
195
196static void ahci_enable_ahci(void __iomem *mmio)
197{
198 int i;
199 u32 tmp;
200
201 /* turn on AHCI_EN */
202 tmp = readl(mmio + HOST_CTL);
203 if (tmp & HOST_AHCI_EN)
204 return;
205
206 /* Some controllers need AHCI_EN to be written multiple times.
207 * Try a few times before giving up.
208 */
209 for (i = 0; i < 5; i++) {
210 tmp |= HOST_AHCI_EN;
211 writel(tmp, mmio + HOST_CTL);
212 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
213 if (tmp & HOST_AHCI_EN)
214 return;
215 msleep(10);
216 }
217
218 WARN_ON(1);
219}
220
221static ssize_t ahci_show_host_caps(struct device *dev,
222 struct device_attribute *attr, char *buf)
223{
224 struct Scsi_Host *shost = class_to_shost(dev);
225 struct ata_port *ap = ata_shost_to_port(shost);
226 struct ahci_host_priv *hpriv = ap->host->private_data;
227
228 return sprintf(buf, "%x\n", hpriv->cap);
229}
230
231static ssize_t ahci_show_host_cap2(struct device *dev,
232 struct device_attribute *attr, char *buf)
233{
234 struct Scsi_Host *shost = class_to_shost(dev);
235 struct ata_port *ap = ata_shost_to_port(shost);
236 struct ahci_host_priv *hpriv = ap->host->private_data;
237
238 return sprintf(buf, "%x\n", hpriv->cap2);
239}
240
241static ssize_t ahci_show_host_version(struct device *dev,
242 struct device_attribute *attr, char *buf)
243{
244 struct Scsi_Host *shost = class_to_shost(dev);
245 struct ata_port *ap = ata_shost_to_port(shost);
246 struct ahci_host_priv *hpriv = ap->host->private_data;
247 void __iomem *mmio = hpriv->mmio;
248
249 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
250}
251
252static ssize_t ahci_show_port_cmd(struct device *dev,
253 struct device_attribute *attr, char *buf)
254{
255 struct Scsi_Host *shost = class_to_shost(dev);
256 struct ata_port *ap = ata_shost_to_port(shost);
257 void __iomem *port_mmio = ahci_port_base(ap);
258
259 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
260}
261
262static ssize_t ahci_read_em_buffer(struct device *dev,
263 struct device_attribute *attr, char *buf)
264{
265 struct Scsi_Host *shost = class_to_shost(dev);
266 struct ata_port *ap = ata_shost_to_port(shost);
267 struct ahci_host_priv *hpriv = ap->host->private_data;
268 void __iomem *mmio = hpriv->mmio;
269 void __iomem *em_mmio = mmio + hpriv->em_loc;
270 u32 em_ctl, msg;
271 unsigned long flags;
272 size_t count;
273 int i;
274
275 spin_lock_irqsave(ap->lock, flags);
276
277 em_ctl = readl(mmio + HOST_EM_CTL);
278 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
279 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
280 spin_unlock_irqrestore(ap->lock, flags);
281 return -EINVAL;
282 }
283
284 if (!(em_ctl & EM_CTL_MR)) {
285 spin_unlock_irqrestore(ap->lock, flags);
286 return -EAGAIN;
287 }
288
289 if (!(em_ctl & EM_CTL_SMB))
290 em_mmio += hpriv->em_buf_sz;
291
292 count = hpriv->em_buf_sz;
293
294 /* the count should not be larger than PAGE_SIZE */
295 if (count > PAGE_SIZE) {
296 if (printk_ratelimit())
297 ata_port_warn(ap,
298 "EM read buffer size too large: "
299 "buffer size %u, page size %lu\n",
300 hpriv->em_buf_sz, PAGE_SIZE);
301 count = PAGE_SIZE;
302 }
303
304 for (i = 0; i < count; i += 4) {
305 msg = readl(em_mmio + i);
306 buf[i] = msg & 0xff;
307 buf[i + 1] = (msg >> 8) & 0xff;
308 buf[i + 2] = (msg >> 16) & 0xff;
309 buf[i + 3] = (msg >> 24) & 0xff;
310 }
311
312 spin_unlock_irqrestore(ap->lock, flags);
313
314 return i;
315}
316
317static ssize_t ahci_store_em_buffer(struct device *dev,
318 struct device_attribute *attr,
319 const char *buf, size_t size)
320{
321 struct Scsi_Host *shost = class_to_shost(dev);
322 struct ata_port *ap = ata_shost_to_port(shost);
323 struct ahci_host_priv *hpriv = ap->host->private_data;
324 void __iomem *mmio = hpriv->mmio;
325 void __iomem *em_mmio = mmio + hpriv->em_loc;
326 const unsigned char *msg_buf = buf;
327 u32 em_ctl, msg;
328 unsigned long flags;
329 int i;
330
331 /* check size validity */
332 if (!(ap->flags & ATA_FLAG_EM) ||
333 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
334 size % 4 || size > hpriv->em_buf_sz)
335 return -EINVAL;
336
337 spin_lock_irqsave(ap->lock, flags);
338
339 em_ctl = readl(mmio + HOST_EM_CTL);
340 if (em_ctl & EM_CTL_TM) {
341 spin_unlock_irqrestore(ap->lock, flags);
342 return -EBUSY;
343 }
344
345 for (i = 0; i < size; i += 4) {
346 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
347 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
348 writel(msg, em_mmio + i);
349 }
350
351 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
352
353 spin_unlock_irqrestore(ap->lock, flags);
354
355 return size;
356}
357
358static ssize_t ahci_show_em_supported(struct device *dev,
359 struct device_attribute *attr, char *buf)
360{
361 struct Scsi_Host *shost = class_to_shost(dev);
362 struct ata_port *ap = ata_shost_to_port(shost);
363 struct ahci_host_priv *hpriv = ap->host->private_data;
364 void __iomem *mmio = hpriv->mmio;
365 u32 em_ctl;
366
367 em_ctl = readl(mmio + HOST_EM_CTL);
368
369 return sprintf(buf, "%s%s%s%s\n",
370 em_ctl & EM_CTL_LED ? "led " : "",
371 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
372 em_ctl & EM_CTL_SES ? "ses-2 " : "",
373 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
374}
375
376/**
377 * ahci_save_initial_config - Save and fixup initial config values
378 * @dev: target AHCI device
379 * @hpriv: host private area to store config values
380 * @force_port_map: force port map to a specified value
381 * @mask_port_map: mask out particular bits from port map
382 *
383 * Some registers containing configuration info might be setup by
384 * BIOS and might be cleared on reset. This function saves the
385 * initial values of those registers into @hpriv such that they
386 * can be restored after controller reset.
387 *
388 * If inconsistent, config values are fixed up by this function.
389 *
390 * LOCKING:
391 * None.
392 */
393void ahci_save_initial_config(struct device *dev,
394 struct ahci_host_priv *hpriv,
395 unsigned int force_port_map,
396 unsigned int mask_port_map)
397{
398 void __iomem *mmio = hpriv->mmio;
399 u32 cap, cap2, vers, port_map;
400 int i;
401
402 /* make sure AHCI mode is enabled before accessing CAP */
403 ahci_enable_ahci(mmio);
404
405 /* Values prefixed with saved_ are written back to host after
406 * reset. Values without are used for driver operation.
407 */
408 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
409 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
410
411 /* CAP2 register is only defined for AHCI 1.2 and later */
412 vers = readl(mmio + HOST_VERSION);
413 if ((vers >> 16) > 1 ||
414 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
415 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
416 else
417 hpriv->saved_cap2 = cap2 = 0;
418
419 /* some chips have errata preventing 64bit use */
420 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
421 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
422 cap &= ~HOST_CAP_64;
423 }
424
425 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
426 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
427 cap &= ~HOST_CAP_NCQ;
428 }
429
430 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
431 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
432 cap |= HOST_CAP_NCQ;
433 }
434
435 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
436 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
437 cap &= ~HOST_CAP_PMP;
438 }
439
440 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
441 dev_info(dev,
442 "controller can't do SNTF, turning off CAP_SNTF\n");
443 cap &= ~HOST_CAP_SNTF;
444 }
445
446 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
447 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
448 cap |= HOST_CAP_FBS;
449 }
450
451 if (force_port_map && port_map != force_port_map) {
452 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
453 port_map, force_port_map);
454 port_map = force_port_map;
455 }
456
457 if (mask_port_map) {
458 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
459 port_map,
460 port_map & mask_port_map);
461 port_map &= mask_port_map;
462 }
463
464 /* cross check port_map and cap.n_ports */
465 if (port_map) {
466 int map_ports = 0;
467
468 for (i = 0; i < AHCI_MAX_PORTS; i++)
469 if (port_map & (1 << i))
470 map_ports++;
471
472 /* If PI has more ports than n_ports, whine, clear
473 * port_map and let it be generated from n_ports.
474 */
475 if (map_ports > ahci_nr_ports(cap)) {
476 dev_warn(dev,
477 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
478 port_map, ahci_nr_ports(cap));
479 port_map = 0;
480 }
481 }
482
483 /* fabricate port_map from cap.nr_ports */
484 if (!port_map) {
485 port_map = (1 << ahci_nr_ports(cap)) - 1;
486 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
487
488 /* write the fixed up value to the PI register */
489 hpriv->saved_port_map = port_map;
490 }
491
492 /* record values to use during operation */
493 hpriv->cap = cap;
494 hpriv->cap2 = cap2;
495 hpriv->port_map = port_map;
496}
497EXPORT_SYMBOL_GPL(ahci_save_initial_config);
498
499/**
500 * ahci_restore_initial_config - Restore initial config
501 * @host: target ATA host
502 *
503 * Restore initial config stored by ahci_save_initial_config().
504 *
505 * LOCKING:
506 * None.
507 */
508static void ahci_restore_initial_config(struct ata_host *host)
509{
510 struct ahci_host_priv *hpriv = host->private_data;
511 void __iomem *mmio = hpriv->mmio;
512
513 writel(hpriv->saved_cap, mmio + HOST_CAP);
514 if (hpriv->saved_cap2)
515 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
516 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
517 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
518}
519
520static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
521{
522 static const int offset[] = {
523 [SCR_STATUS] = PORT_SCR_STAT,
524 [SCR_CONTROL] = PORT_SCR_CTL,
525 [SCR_ERROR] = PORT_SCR_ERR,
526 [SCR_ACTIVE] = PORT_SCR_ACT,
527 [SCR_NOTIFICATION] = PORT_SCR_NTF,
528 };
529 struct ahci_host_priv *hpriv = ap->host->private_data;
530
531 if (sc_reg < ARRAY_SIZE(offset) &&
532 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
533 return offset[sc_reg];
534 return 0;
535}
536
537static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
538{
539 void __iomem *port_mmio = ahci_port_base(link->ap);
540 int offset = ahci_scr_offset(link->ap, sc_reg);
541
542 if (offset) {
543 *val = readl(port_mmio + offset);
544 return 0;
545 }
546 return -EINVAL;
547}
548
549static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
550{
551 void __iomem *port_mmio = ahci_port_base(link->ap);
552 int offset = ahci_scr_offset(link->ap, sc_reg);
553
554 if (offset) {
555 writel(val, port_mmio + offset);
556 return 0;
557 }
558 return -EINVAL;
559}
560
561void ahci_start_engine(struct ata_port *ap)
562{
563 void __iomem *port_mmio = ahci_port_base(ap);
564 u32 tmp;
565
566 /* start DMA */
567 tmp = readl(port_mmio + PORT_CMD);
568 tmp |= PORT_CMD_START;
569 writel(tmp, port_mmio + PORT_CMD);
570 readl(port_mmio + PORT_CMD); /* flush */
571}
572EXPORT_SYMBOL_GPL(ahci_start_engine);
573
574int ahci_stop_engine(struct ata_port *ap)
575{
576 void __iomem *port_mmio = ahci_port_base(ap);
577 u32 tmp;
578
579 tmp = readl(port_mmio + PORT_CMD);
580
581 /* check if the HBA is idle */
582 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
583 return 0;
584
585 /* setting HBA to idle */
586 tmp &= ~PORT_CMD_START;
587 writel(tmp, port_mmio + PORT_CMD);
588
589 /* wait for engine to stop. This could be as long as 500 msec */
590 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
591 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
592 if (tmp & PORT_CMD_LIST_ON)
593 return -EIO;
594
595 return 0;
596}
597EXPORT_SYMBOL_GPL(ahci_stop_engine);
598
599static void ahci_start_fis_rx(struct ata_port *ap)
600{
601 void __iomem *port_mmio = ahci_port_base(ap);
602 struct ahci_host_priv *hpriv = ap->host->private_data;
603 struct ahci_port_priv *pp = ap->private_data;
604 u32 tmp;
605
606 /* set FIS registers */
607 if (hpriv->cap & HOST_CAP_64)
608 writel((pp->cmd_slot_dma >> 16) >> 16,
609 port_mmio + PORT_LST_ADDR_HI);
610 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
611
612 if (hpriv->cap & HOST_CAP_64)
613 writel((pp->rx_fis_dma >> 16) >> 16,
614 port_mmio + PORT_FIS_ADDR_HI);
615 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
616
617 /* enable FIS reception */
618 tmp = readl(port_mmio + PORT_CMD);
619 tmp |= PORT_CMD_FIS_RX;
620 writel(tmp, port_mmio + PORT_CMD);
621
622 /* flush */
623 readl(port_mmio + PORT_CMD);
624}
625
626static int ahci_stop_fis_rx(struct ata_port *ap)
627{
628 void __iomem *port_mmio = ahci_port_base(ap);
629 u32 tmp;
630
631 /* disable FIS reception */
632 tmp = readl(port_mmio + PORT_CMD);
633 tmp &= ~PORT_CMD_FIS_RX;
634 writel(tmp, port_mmio + PORT_CMD);
635
636 /* wait for completion, spec says 500ms, give it 1000 */
637 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
638 PORT_CMD_FIS_ON, 10, 1000);
639 if (tmp & PORT_CMD_FIS_ON)
640 return -EBUSY;
641
642 return 0;
643}
644
645static void ahci_power_up(struct ata_port *ap)
646{
647 struct ahci_host_priv *hpriv = ap->host->private_data;
648 void __iomem *port_mmio = ahci_port_base(ap);
649 u32 cmd;
650
651 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
652
653 /* spin up device */
654 if (hpriv->cap & HOST_CAP_SSS) {
655 cmd |= PORT_CMD_SPIN_UP;
656 writel(cmd, port_mmio + PORT_CMD);
657 }
658
659 /* wake up link */
660 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
661}
662
663static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
664 unsigned int hints)
665{
666 struct ata_port *ap = link->ap;
667 struct ahci_host_priv *hpriv = ap->host->private_data;
668 struct ahci_port_priv *pp = ap->private_data;
669 void __iomem *port_mmio = ahci_port_base(ap);
670
671 if (policy != ATA_LPM_MAX_POWER) {
672 /*
673 * Disable interrupts on Phy Ready. This keeps us from
674 * getting woken up due to spurious phy ready
675 * interrupts.
676 */
677 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
678 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
679
680 sata_link_scr_lpm(link, policy, false);
681 }
682
683 if (hpriv->cap & HOST_CAP_ALPM) {
684 u32 cmd = readl(port_mmio + PORT_CMD);
685
686 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
687 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
688 cmd |= PORT_CMD_ICC_ACTIVE;
689
690 writel(cmd, port_mmio + PORT_CMD);
691 readl(port_mmio + PORT_CMD);
692
693 /* wait 10ms to be sure we've come out of LPM state */
694 ata_msleep(ap, 10);
695 } else {
696 cmd |= PORT_CMD_ALPE;
697 if (policy == ATA_LPM_MIN_POWER)
698 cmd |= PORT_CMD_ASP;
699
700 /* write out new cmd value */
701 writel(cmd, port_mmio + PORT_CMD);
702 }
703 }
704
705 if (policy == ATA_LPM_MAX_POWER) {
706 sata_link_scr_lpm(link, policy, false);
707
708 /* turn PHYRDY IRQ back on */
709 pp->intr_mask |= PORT_IRQ_PHYRDY;
710 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
711 }
712
713 return 0;
714}
715
716#ifdef CONFIG_PM
717static void ahci_power_down(struct ata_port *ap)
718{
719 struct ahci_host_priv *hpriv = ap->host->private_data;
720 void __iomem *port_mmio = ahci_port_base(ap);
721 u32 cmd, scontrol;
722
723 if (!(hpriv->cap & HOST_CAP_SSS))
724 return;
725
726 /* put device into listen mode, first set PxSCTL.DET to 0 */
727 scontrol = readl(port_mmio + PORT_SCR_CTL);
728 scontrol &= ~0xf;
729 writel(scontrol, port_mmio + PORT_SCR_CTL);
730
731 /* then set PxCMD.SUD to 0 */
732 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
733 cmd &= ~PORT_CMD_SPIN_UP;
734 writel(cmd, port_mmio + PORT_CMD);
735}
736#endif
737
738static void ahci_start_port(struct ata_port *ap)
739{
740 struct ahci_port_priv *pp = ap->private_data;
741 struct ata_link *link;
742 struct ahci_em_priv *emp;
743 ssize_t rc;
744 int i;
745
746 /* enable FIS reception */
747 ahci_start_fis_rx(ap);
748
749 /* enable DMA */
750 ahci_start_engine(ap);
751
752 /* turn on LEDs */
753 if (ap->flags & ATA_FLAG_EM) {
754 ata_for_each_link(link, ap, EDGE) {
755 emp = &pp->em_priv[link->pmp];
756
757 /* EM Transmit bit maybe busy during init */
758 for (i = 0; i < EM_MAX_RETRY; i++) {
759 rc = ahci_transmit_led_message(ap,
760 emp->led_state,
761 4);
762 if (rc == -EBUSY)
763 ata_msleep(ap, 1);
764 else
765 break;
766 }
767 }
768 }
769
770 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
771 ata_for_each_link(link, ap, EDGE)
772 ahci_init_sw_activity(link);
773
774}
775
776static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
777{
778 int rc;
779
780 /* disable DMA */
781 rc = ahci_stop_engine(ap);
782 if (rc) {
783 *emsg = "failed to stop engine";
784 return rc;
785 }
786
787 /* disable FIS reception */
788 rc = ahci_stop_fis_rx(ap);
789 if (rc) {
790 *emsg = "failed stop FIS RX";
791 return rc;
792 }
793
794 return 0;
795}
796
797int ahci_reset_controller(struct ata_host *host)
798{
799 struct ahci_host_priv *hpriv = host->private_data;
800 void __iomem *mmio = hpriv->mmio;
801 u32 tmp;
802
803 /* we must be in AHCI mode, before using anything
804 * AHCI-specific, such as HOST_RESET.
805 */
806 ahci_enable_ahci(mmio);
807
808 /* global controller reset */
809 if (!ahci_skip_host_reset) {
810 tmp = readl(mmio + HOST_CTL);
811 if ((tmp & HOST_RESET) == 0) {
812 writel(tmp | HOST_RESET, mmio + HOST_CTL);
813 readl(mmio + HOST_CTL); /* flush */
814 }
815
816 /*
817 * to perform host reset, OS should set HOST_RESET
818 * and poll until this bit is read to be "0".
819 * reset must complete within 1 second, or
820 * the hardware should be considered fried.
821 */
822 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
823 HOST_RESET, 10, 1000);
824
825 if (tmp & HOST_RESET) {
826 dev_err(host->dev, "controller reset failed (0x%x)\n",
827 tmp);
828 return -EIO;
829 }
830
831 /* turn on AHCI mode */
832 ahci_enable_ahci(mmio);
833
834 /* Some registers might be cleared on reset. Restore
835 * initial values.
836 */
837 ahci_restore_initial_config(host);
838 } else
839 dev_info(host->dev, "skipping global host reset\n");
840
841 return 0;
842}
843EXPORT_SYMBOL_GPL(ahci_reset_controller);
844
845static void ahci_sw_activity(struct ata_link *link)
846{
847 struct ata_port *ap = link->ap;
848 struct ahci_port_priv *pp = ap->private_data;
849 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
850
851 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
852 return;
853
854 emp->activity++;
855 if (!timer_pending(&emp->timer))
856 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
857}
858
859static void ahci_sw_activity_blink(unsigned long arg)
860{
861 struct ata_link *link = (struct ata_link *)arg;
862 struct ata_port *ap = link->ap;
863 struct ahci_port_priv *pp = ap->private_data;
864 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
865 unsigned long led_message = emp->led_state;
866 u32 activity_led_state;
867 unsigned long flags;
868
869 led_message &= EM_MSG_LED_VALUE;
870 led_message |= ap->port_no | (link->pmp << 8);
871
872 /* check to see if we've had activity. If so,
873 * toggle state of LED and reset timer. If not,
874 * turn LED to desired idle state.
875 */
876 spin_lock_irqsave(ap->lock, flags);
877 if (emp->saved_activity != emp->activity) {
878 emp->saved_activity = emp->activity;
879 /* get the current LED state */
880 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
881
882 if (activity_led_state)
883 activity_led_state = 0;
884 else
885 activity_led_state = 1;
886
887 /* clear old state */
888 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
889
890 /* toggle state */
891 led_message |= (activity_led_state << 16);
892 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
893 } else {
894 /* switch to idle */
895 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
896 if (emp->blink_policy == BLINK_OFF)
897 led_message |= (1 << 16);
898 }
899 spin_unlock_irqrestore(ap->lock, flags);
900 ahci_transmit_led_message(ap, led_message, 4);
901}
902
903static void ahci_init_sw_activity(struct ata_link *link)
904{
905 struct ata_port *ap = link->ap;
906 struct ahci_port_priv *pp = ap->private_data;
907 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
908
909 /* init activity stats, setup timer */
910 emp->saved_activity = emp->activity = 0;
911 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
912
913 /* check our blink policy and set flag for link if it's enabled */
914 if (emp->blink_policy)
915 link->flags |= ATA_LFLAG_SW_ACTIVITY;
916}
917
918int ahci_reset_em(struct ata_host *host)
919{
920 struct ahci_host_priv *hpriv = host->private_data;
921 void __iomem *mmio = hpriv->mmio;
922 u32 em_ctl;
923
924 em_ctl = readl(mmio + HOST_EM_CTL);
925 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
926 return -EINVAL;
927
928 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
929 return 0;
930}
931EXPORT_SYMBOL_GPL(ahci_reset_em);
932
933static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
934 ssize_t size)
935{
936 struct ahci_host_priv *hpriv = ap->host->private_data;
937 struct ahci_port_priv *pp = ap->private_data;
938 void __iomem *mmio = hpriv->mmio;
939 u32 em_ctl;
940 u32 message[] = {0, 0};
941 unsigned long flags;
942 int pmp;
943 struct ahci_em_priv *emp;
944
945 /* get the slot number from the message */
946 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
947 if (pmp < EM_MAX_SLOTS)
948 emp = &pp->em_priv[pmp];
949 else
950 return -EINVAL;
951
952 spin_lock_irqsave(ap->lock, flags);
953
954 /*
955 * if we are still busy transmitting a previous message,
956 * do not allow
957 */
958 em_ctl = readl(mmio + HOST_EM_CTL);
959 if (em_ctl & EM_CTL_TM) {
960 spin_unlock_irqrestore(ap->lock, flags);
961 return -EBUSY;
962 }
963
964 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
965 /*
966 * create message header - this is all zero except for
967 * the message size, which is 4 bytes.
968 */
969 message[0] |= (4 << 8);
970
971 /* ignore 0:4 of byte zero, fill in port info yourself */
972 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
973
974 /* write message to EM_LOC */
975 writel(message[0], mmio + hpriv->em_loc);
976 writel(message[1], mmio + hpriv->em_loc+4);
977
978 /*
979 * tell hardware to transmit the message
980 */
981 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
982 }
983
984 /* save off new led state for port/slot */
985 emp->led_state = state;
986
987 spin_unlock_irqrestore(ap->lock, flags);
988 return size;
989}
990
991static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
992{
993 struct ahci_port_priv *pp = ap->private_data;
994 struct ata_link *link;
995 struct ahci_em_priv *emp;
996 int rc = 0;
997
998 ata_for_each_link(link, ap, EDGE) {
999 emp = &pp->em_priv[link->pmp];
1000 rc += sprintf(buf, "%lx\n", emp->led_state);
1001 }
1002 return rc;
1003}
1004
1005static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1006 size_t size)
1007{
1008 int state;
1009 int pmp;
1010 struct ahci_port_priv *pp = ap->private_data;
1011 struct ahci_em_priv *emp;
1012
1013 state = simple_strtoul(buf, NULL, 0);
1014
1015 /* get the slot number from the message */
1016 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1017 if (pmp < EM_MAX_SLOTS)
1018 emp = &pp->em_priv[pmp];
1019 else
1020 return -EINVAL;
1021
1022 /* mask off the activity bits if we are in sw_activity
1023 * mode, user should turn off sw_activity before setting
1024 * activity led through em_message
1025 */
1026 if (emp->blink_policy)
1027 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1028
1029 return ahci_transmit_led_message(ap, state, size);
1030}
1031
1032static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1033{
1034 struct ata_link *link = dev->link;
1035 struct ata_port *ap = link->ap;
1036 struct ahci_port_priv *pp = ap->private_data;
1037 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1038 u32 port_led_state = emp->led_state;
1039
1040 /* save the desired Activity LED behavior */
1041 if (val == OFF) {
1042 /* clear LFLAG */
1043 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1044
1045 /* set the LED to OFF */
1046 port_led_state &= EM_MSG_LED_VALUE_OFF;
1047 port_led_state |= (ap->port_no | (link->pmp << 8));
1048 ahci_transmit_led_message(ap, port_led_state, 4);
1049 } else {
1050 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1051 if (val == BLINK_OFF) {
1052 /* set LED to ON for idle */
1053 port_led_state &= EM_MSG_LED_VALUE_OFF;
1054 port_led_state |= (ap->port_no | (link->pmp << 8));
1055 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1056 ahci_transmit_led_message(ap, port_led_state, 4);
1057 }
1058 }
1059 emp->blink_policy = val;
1060 return 0;
1061}
1062
1063static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1064{
1065 struct ata_link *link = dev->link;
1066 struct ata_port *ap = link->ap;
1067 struct ahci_port_priv *pp = ap->private_data;
1068 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1069
1070 /* display the saved value of activity behavior for this
1071 * disk.
1072 */
1073 return sprintf(buf, "%d\n", emp->blink_policy);
1074}
1075
1076static void ahci_port_init(struct device *dev, struct ata_port *ap,
1077 int port_no, void __iomem *mmio,
1078 void __iomem *port_mmio)
1079{
1080 const char *emsg = NULL;
1081 int rc;
1082 u32 tmp;
1083
1084 /* make sure port is not active */
1085 rc = ahci_deinit_port(ap, &emsg);
1086 if (rc)
1087 dev_warn(dev, "%s (%d)\n", emsg, rc);
1088
1089 /* clear SError */
1090 tmp = readl(port_mmio + PORT_SCR_ERR);
1091 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1092 writel(tmp, port_mmio + PORT_SCR_ERR);
1093
1094 /* clear port IRQ */
1095 tmp = readl(port_mmio + PORT_IRQ_STAT);
1096 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1097 if (tmp)
1098 writel(tmp, port_mmio + PORT_IRQ_STAT);
1099
1100 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1101}
1102
1103void ahci_init_controller(struct ata_host *host)
1104{
1105 struct ahci_host_priv *hpriv = host->private_data;
1106 void __iomem *mmio = hpriv->mmio;
1107 int i;
1108 void __iomem *port_mmio;
1109 u32 tmp;
1110
1111 for (i = 0; i < host->n_ports; i++) {
1112 struct ata_port *ap = host->ports[i];
1113
1114 port_mmio = ahci_port_base(ap);
1115 if (ata_port_is_dummy(ap))
1116 continue;
1117
1118 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1119 }
1120
1121 tmp = readl(mmio + HOST_CTL);
1122 VPRINTK("HOST_CTL 0x%x\n", tmp);
1123 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1124 tmp = readl(mmio + HOST_CTL);
1125 VPRINTK("HOST_CTL 0x%x\n", tmp);
1126}
1127EXPORT_SYMBOL_GPL(ahci_init_controller);
1128
1129static void ahci_dev_config(struct ata_device *dev)
1130{
1131 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1132
1133 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1134 dev->max_sectors = 255;
1135 ata_dev_info(dev,
1136 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1137 }
1138}
1139
1140static unsigned int ahci_dev_classify(struct ata_port *ap)
1141{
1142 void __iomem *port_mmio = ahci_port_base(ap);
1143 struct ata_taskfile tf;
1144 u32 tmp;
1145
1146 tmp = readl(port_mmio + PORT_SIG);
1147 tf.lbah = (tmp >> 24) & 0xff;
1148 tf.lbam = (tmp >> 16) & 0xff;
1149 tf.lbal = (tmp >> 8) & 0xff;
1150 tf.nsect = (tmp) & 0xff;
1151
1152 return ata_dev_classify(&tf);
1153}
1154
1155void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1156 u32 opts)
1157{
1158 dma_addr_t cmd_tbl_dma;
1159
1160 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1161
1162 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1163 pp->cmd_slot[tag].status = 0;
1164 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1165 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1166}
1167EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1168
1169int ahci_kick_engine(struct ata_port *ap)
1170{
1171 void __iomem *port_mmio = ahci_port_base(ap);
1172 struct ahci_host_priv *hpriv = ap->host->private_data;
1173 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1174 u32 tmp;
1175 int busy, rc;
1176
1177 /* stop engine */
1178 rc = ahci_stop_engine(ap);
1179 if (rc)
1180 goto out_restart;
1181
1182 /* need to do CLO?
1183 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1184 */
1185 busy = status & (ATA_BUSY | ATA_DRQ);
1186 if (!busy && !sata_pmp_attached(ap)) {
1187 rc = 0;
1188 goto out_restart;
1189 }
1190
1191 if (!(hpriv->cap & HOST_CAP_CLO)) {
1192 rc = -EOPNOTSUPP;
1193 goto out_restart;
1194 }
1195
1196 /* perform CLO */
1197 tmp = readl(port_mmio + PORT_CMD);
1198 tmp |= PORT_CMD_CLO;
1199 writel(tmp, port_mmio + PORT_CMD);
1200
1201 rc = 0;
1202 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1203 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1204 if (tmp & PORT_CMD_CLO)
1205 rc = -EIO;
1206
1207 /* restart engine */
1208 out_restart:
1209 ahci_start_engine(ap);
1210 return rc;
1211}
1212EXPORT_SYMBOL_GPL(ahci_kick_engine);
1213
1214static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1215 struct ata_taskfile *tf, int is_cmd, u16 flags,
1216 unsigned long timeout_msec)
1217{
1218 const u32 cmd_fis_len = 5; /* five dwords */
1219 struct ahci_port_priv *pp = ap->private_data;
1220 void __iomem *port_mmio = ahci_port_base(ap);
1221 u8 *fis = pp->cmd_tbl;
1222 u32 tmp;
1223
1224 /* prep the command */
1225 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1226 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1227
1228 /* issue & wait */
1229 writel(1, port_mmio + PORT_CMD_ISSUE);
1230
1231 if (timeout_msec) {
1232 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1233 0x1, 0x1, 1, timeout_msec);
1234 if (tmp & 0x1) {
1235 ahci_kick_engine(ap);
1236 return -EBUSY;
1237 }
1238 } else
1239 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1240
1241 return 0;
1242}
1243
1244int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1245 int pmp, unsigned long deadline,
1246 int (*check_ready)(struct ata_link *link))
1247{
1248 struct ata_port *ap = link->ap;
1249 struct ahci_host_priv *hpriv = ap->host->private_data;
1250 const char *reason = NULL;
1251 unsigned long now, msecs;
1252 struct ata_taskfile tf;
1253 int rc;
1254
1255 DPRINTK("ENTER\n");
1256
1257 /* prepare for SRST (AHCI-1.1 10.4.1) */
1258 rc = ahci_kick_engine(ap);
1259 if (rc && rc != -EOPNOTSUPP)
1260 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1261
1262 ata_tf_init(link->device, &tf);
1263
1264 /* issue the first D2H Register FIS */
1265 msecs = 0;
1266 now = jiffies;
1267 if (time_after(deadline, now))
1268 msecs = jiffies_to_msecs(deadline - now);
1269
1270 tf.ctl |= ATA_SRST;
1271 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1272 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1273 rc = -EIO;
1274 reason = "1st FIS failed";
1275 goto fail;
1276 }
1277
1278 /* spec says at least 5us, but be generous and sleep for 1ms */
1279 ata_msleep(ap, 1);
1280
1281 /* issue the second D2H Register FIS */
1282 tf.ctl &= ~ATA_SRST;
1283 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1284
1285 /* wait for link to become ready */
1286 rc = ata_wait_after_reset(link, deadline, check_ready);
1287 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1288 /*
1289 * Workaround for cases where link online status can't
1290 * be trusted. Treat device readiness timeout as link
1291 * offline.
1292 */
1293 ata_link_info(link, "device not ready, treating as offline\n");
1294 *class = ATA_DEV_NONE;
1295 } else if (rc) {
1296 /* link occupied, -ENODEV too is an error */
1297 reason = "device not ready";
1298 goto fail;
1299 } else
1300 *class = ahci_dev_classify(ap);
1301
1302 DPRINTK("EXIT, class=%u\n", *class);
1303 return 0;
1304
1305 fail:
1306 ata_link_err(link, "softreset failed (%s)\n", reason);
1307 return rc;
1308}
1309
1310int ahci_check_ready(struct ata_link *link)
1311{
1312 void __iomem *port_mmio = ahci_port_base(link->ap);
1313 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1314
1315 return ata_check_ready(status);
1316}
1317EXPORT_SYMBOL_GPL(ahci_check_ready);
1318
1319static int ahci_softreset(struct ata_link *link, unsigned int *class,
1320 unsigned long deadline)
1321{
1322 int pmp = sata_srst_pmp(link);
1323
1324 DPRINTK("ENTER\n");
1325
1326 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1327}
1328EXPORT_SYMBOL_GPL(ahci_do_softreset);
1329
1330static int ahci_bad_pmp_check_ready(struct ata_link *link)
1331{
1332 void __iomem *port_mmio = ahci_port_base(link->ap);
1333 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1334 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1335
1336 /*
1337 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1338 * which can save timeout delay.
1339 */
1340 if (irq_status & PORT_IRQ_BAD_PMP)
1341 return -EIO;
1342
1343 return ata_check_ready(status);
1344}
1345
1346int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1347 unsigned long deadline)
1348{
1349 struct ata_port *ap = link->ap;
1350 void __iomem *port_mmio = ahci_port_base(ap);
1351 int pmp = sata_srst_pmp(link);
1352 int rc;
1353 u32 irq_sts;
1354
1355 DPRINTK("ENTER\n");
1356
1357 rc = ahci_do_softreset(link, class, pmp, deadline,
1358 ahci_bad_pmp_check_ready);
1359
1360 /*
1361 * Soft reset fails with IPMS set when PMP is enabled but
1362 * SATA HDD/ODD is connected to SATA port, do soft reset
1363 * again to port 0.
1364 */
1365 if (rc == -EIO) {
1366 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1367 if (irq_sts & PORT_IRQ_BAD_PMP) {
1368 ata_link_printk(link, KERN_WARNING,
1369 "applying PMP SRST workaround "
1370 "and retrying\n");
1371 rc = ahci_do_softreset(link, class, 0, deadline,
1372 ahci_check_ready);
1373 }
1374 }
1375
1376 return rc;
1377}
1378
1379static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1380 unsigned long deadline)
1381{
1382 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1383 struct ata_port *ap = link->ap;
1384 struct ahci_port_priv *pp = ap->private_data;
1385 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1386 struct ata_taskfile tf;
1387 bool online;
1388 int rc;
1389
1390 DPRINTK("ENTER\n");
1391
1392 ahci_stop_engine(ap);
1393
1394 /* clear D2H reception area to properly wait for D2H FIS */
1395 ata_tf_init(link->device, &tf);
1396 tf.command = 0x80;
1397 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1398
1399 rc = sata_link_hardreset(link, timing, deadline, &online,
1400 ahci_check_ready);
1401
1402 ahci_start_engine(ap);
1403
1404 if (online)
1405 *class = ahci_dev_classify(ap);
1406
1407 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1408 return rc;
1409}
1410
1411static void ahci_postreset(struct ata_link *link, unsigned int *class)
1412{
1413 struct ata_port *ap = link->ap;
1414 void __iomem *port_mmio = ahci_port_base(ap);
1415 u32 new_tmp, tmp;
1416
1417 ata_std_postreset(link, class);
1418
1419 /* Make sure port's ATAPI bit is set appropriately */
1420 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1421 if (*class == ATA_DEV_ATAPI)
1422 new_tmp |= PORT_CMD_ATAPI;
1423 else
1424 new_tmp &= ~PORT_CMD_ATAPI;
1425 if (new_tmp != tmp) {
1426 writel(new_tmp, port_mmio + PORT_CMD);
1427 readl(port_mmio + PORT_CMD); /* flush */
1428 }
1429}
1430
1431static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1432{
1433 struct scatterlist *sg;
1434 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1435 unsigned int si;
1436
1437 VPRINTK("ENTER\n");
1438
1439 /*
1440 * Next, the S/G list.
1441 */
1442 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1443 dma_addr_t addr = sg_dma_address(sg);
1444 u32 sg_len = sg_dma_len(sg);
1445
1446 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1447 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1448 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1449 }
1450
1451 return si;
1452}
1453
1454static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1455{
1456 struct ata_port *ap = qc->ap;
1457 struct ahci_port_priv *pp = ap->private_data;
1458
1459 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1460 return ata_std_qc_defer(qc);
1461 else
1462 return sata_pmp_qc_defer_cmd_switch(qc);
1463}
1464
1465static void ahci_qc_prep(struct ata_queued_cmd *qc)
1466{
1467 struct ata_port *ap = qc->ap;
1468 struct ahci_port_priv *pp = ap->private_data;
1469 int is_atapi = ata_is_atapi(qc->tf.protocol);
1470 void *cmd_tbl;
1471 u32 opts;
1472 const u32 cmd_fis_len = 5; /* five dwords */
1473 unsigned int n_elem;
1474
1475 /*
1476 * Fill in command table information. First, the header,
1477 * a SATA Register - Host to Device command FIS.
1478 */
1479 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1480
1481 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1482 if (is_atapi) {
1483 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1484 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1485 }
1486
1487 n_elem = 0;
1488 if (qc->flags & ATA_QCFLAG_DMAMAP)
1489 n_elem = ahci_fill_sg(qc, cmd_tbl);
1490
1491 /*
1492 * Fill in command slot information.
1493 */
1494 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1495 if (qc->tf.flags & ATA_TFLAG_WRITE)
1496 opts |= AHCI_CMD_WRITE;
1497 if (is_atapi)
1498 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1499
1500 ahci_fill_cmd_slot(pp, qc->tag, opts);
1501}
1502
1503static void ahci_fbs_dec_intr(struct ata_port *ap)
1504{
1505 struct ahci_port_priv *pp = ap->private_data;
1506 void __iomem *port_mmio = ahci_port_base(ap);
1507 u32 fbs = readl(port_mmio + PORT_FBS);
1508 int retries = 3;
1509
1510 DPRINTK("ENTER\n");
1511 BUG_ON(!pp->fbs_enabled);
1512
1513 /* time to wait for DEC is not specified by AHCI spec,
1514 * add a retry loop for safety.
1515 */
1516 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1517 fbs = readl(port_mmio + PORT_FBS);
1518 while ((fbs & PORT_FBS_DEC) && retries--) {
1519 udelay(1);
1520 fbs = readl(port_mmio + PORT_FBS);
1521 }
1522
1523 if (fbs & PORT_FBS_DEC)
1524 dev_err(ap->host->dev, "failed to clear device error\n");
1525}
1526
1527static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1528{
1529 struct ahci_host_priv *hpriv = ap->host->private_data;
1530 struct ahci_port_priv *pp = ap->private_data;
1531 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1532 struct ata_link *link = NULL;
1533 struct ata_queued_cmd *active_qc;
1534 struct ata_eh_info *active_ehi;
1535 bool fbs_need_dec = false;
1536 u32 serror;
1537
1538 /* determine active link with error */
1539 if (pp->fbs_enabled) {
1540 void __iomem *port_mmio = ahci_port_base(ap);
1541 u32 fbs = readl(port_mmio + PORT_FBS);
1542 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1543
1544 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1545 ata_link_online(&ap->pmp_link[pmp])) {
1546 link = &ap->pmp_link[pmp];
1547 fbs_need_dec = true;
1548 }
1549
1550 } else
1551 ata_for_each_link(link, ap, EDGE)
1552 if (ata_link_active(link))
1553 break;
1554
1555 if (!link)
1556 link = &ap->link;
1557
1558 active_qc = ata_qc_from_tag(ap, link->active_tag);
1559 active_ehi = &link->eh_info;
1560
1561 /* record irq stat */
1562 ata_ehi_clear_desc(host_ehi);
1563 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1564
1565 /* AHCI needs SError cleared; otherwise, it might lock up */
1566 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1567 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1568 host_ehi->serror |= serror;
1569
1570 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1571 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1572 irq_stat &= ~PORT_IRQ_IF_ERR;
1573
1574 if (irq_stat & PORT_IRQ_TF_ERR) {
1575 /* If qc is active, charge it; otherwise, the active
1576 * link. There's no active qc on NCQ errors. It will
1577 * be determined by EH by reading log page 10h.
1578 */
1579 if (active_qc)
1580 active_qc->err_mask |= AC_ERR_DEV;
1581 else
1582 active_ehi->err_mask |= AC_ERR_DEV;
1583
1584 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1585 host_ehi->serror &= ~SERR_INTERNAL;
1586 }
1587
1588 if (irq_stat & PORT_IRQ_UNK_FIS) {
1589 u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1590
1591 active_ehi->err_mask |= AC_ERR_HSM;
1592 active_ehi->action |= ATA_EH_RESET;
1593 ata_ehi_push_desc(active_ehi,
1594 "unknown FIS %08x %08x %08x %08x" ,
1595 unk[0], unk[1], unk[2], unk[3]);
1596 }
1597
1598 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1599 active_ehi->err_mask |= AC_ERR_HSM;
1600 active_ehi->action |= ATA_EH_RESET;
1601 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1602 }
1603
1604 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1605 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1606 host_ehi->action |= ATA_EH_RESET;
1607 ata_ehi_push_desc(host_ehi, "host bus error");
1608 }
1609
1610 if (irq_stat & PORT_IRQ_IF_ERR) {
1611 if (fbs_need_dec)
1612 active_ehi->err_mask |= AC_ERR_DEV;
1613 else {
1614 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1615 host_ehi->action |= ATA_EH_RESET;
1616 }
1617
1618 ata_ehi_push_desc(host_ehi, "interface fatal error");
1619 }
1620
1621 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1622 ata_ehi_hotplugged(host_ehi);
1623 ata_ehi_push_desc(host_ehi, "%s",
1624 irq_stat & PORT_IRQ_CONNECT ?
1625 "connection status changed" : "PHY RDY changed");
1626 }
1627
1628 /* okay, let's hand over to EH */
1629
1630 if (irq_stat & PORT_IRQ_FREEZE)
1631 ata_port_freeze(ap);
1632 else if (fbs_need_dec) {
1633 ata_link_abort(link);
1634 ahci_fbs_dec_intr(ap);
1635 } else
1636 ata_port_abort(ap);
1637}
1638
1639static void ahci_port_intr(struct ata_port *ap)
1640{
1641 void __iomem *port_mmio = ahci_port_base(ap);
1642 struct ata_eh_info *ehi = &ap->link.eh_info;
1643 struct ahci_port_priv *pp = ap->private_data;
1644 struct ahci_host_priv *hpriv = ap->host->private_data;
1645 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1646 u32 status, qc_active = 0;
1647 int rc;
1648
1649 status = readl(port_mmio + PORT_IRQ_STAT);
1650 writel(status, port_mmio + PORT_IRQ_STAT);
1651
1652 /* ignore BAD_PMP while resetting */
1653 if (unlikely(resetting))
1654 status &= ~PORT_IRQ_BAD_PMP;
1655
1656 /* if LPM is enabled, PHYRDY doesn't mean anything */
1657 if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
1658 status &= ~PORT_IRQ_PHYRDY;
1659 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1660 }
1661
1662 if (unlikely(status & PORT_IRQ_ERROR)) {
1663 ahci_error_intr(ap, status);
1664 return;
1665 }
1666
1667 if (status & PORT_IRQ_SDB_FIS) {
1668 /* If SNotification is available, leave notification
1669 * handling to sata_async_notification(). If not,
1670 * emulate it by snooping SDB FIS RX area.
1671 *
1672 * Snooping FIS RX area is probably cheaper than
1673 * poking SNotification but some constrollers which
1674 * implement SNotification, ICH9 for example, don't
1675 * store AN SDB FIS into receive area.
1676 */
1677 if (hpriv->cap & HOST_CAP_SNTF)
1678 sata_async_notification(ap);
1679 else {
1680 /* If the 'N' bit in word 0 of the FIS is set,
1681 * we just received asynchronous notification.
1682 * Tell libata about it.
1683 *
1684 * Lack of SNotification should not appear in
1685 * ahci 1.2, so the workaround is unnecessary
1686 * when FBS is enabled.
1687 */
1688 if (pp->fbs_enabled)
1689 WARN_ON_ONCE(1);
1690 else {
1691 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1692 u32 f0 = le32_to_cpu(f[0]);
1693 if (f0 & (1 << 15))
1694 sata_async_notification(ap);
1695 }
1696 }
1697 }
1698
1699 /* pp->active_link is not reliable once FBS is enabled, both
1700 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1701 * NCQ and non-NCQ commands may be in flight at the same time.
1702 */
1703 if (pp->fbs_enabled) {
1704 if (ap->qc_active) {
1705 qc_active = readl(port_mmio + PORT_SCR_ACT);
1706 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1707 }
1708 } else {
1709 /* pp->active_link is valid iff any command is in flight */
1710 if (ap->qc_active && pp->active_link->sactive)
1711 qc_active = readl(port_mmio + PORT_SCR_ACT);
1712 else
1713 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1714 }
1715
1716
1717 rc = ata_qc_complete_multiple(ap, qc_active);
1718
1719 /* while resetting, invalid completions are expected */
1720 if (unlikely(rc < 0 && !resetting)) {
1721 ehi->err_mask |= AC_ERR_HSM;
1722 ehi->action |= ATA_EH_RESET;
1723 ata_port_freeze(ap);
1724 }
1725}
1726
1727irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1728{
1729 struct ata_host *host = dev_instance;
1730 struct ahci_host_priv *hpriv;
1731 unsigned int i, handled = 0;
1732 void __iomem *mmio;
1733 u32 irq_stat, irq_masked;
1734
1735 VPRINTK("ENTER\n");
1736
1737 hpriv = host->private_data;
1738 mmio = hpriv->mmio;
1739
1740 /* sigh. 0xffffffff is a valid return from h/w */
1741 irq_stat = readl(mmio + HOST_IRQ_STAT);
1742 if (!irq_stat)
1743 return IRQ_NONE;
1744
1745 irq_masked = irq_stat & hpriv->port_map;
1746
1747 spin_lock(&host->lock);
1748
1749 for (i = 0; i < host->n_ports; i++) {
1750 struct ata_port *ap;
1751
1752 if (!(irq_masked & (1 << i)))
1753 continue;
1754
1755 ap = host->ports[i];
1756 if (ap) {
1757 ahci_port_intr(ap);
1758 VPRINTK("port %u\n", i);
1759 } else {
1760 VPRINTK("port %u (no irq)\n", i);
1761 if (ata_ratelimit())
1762 dev_warn(host->dev,
1763 "interrupt on disabled port %u\n", i);
1764 }
1765
1766 handled = 1;
1767 }
1768
1769 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1770 * it should be cleared after all the port events are cleared;
1771 * otherwise, it will raise a spurious interrupt after each
1772 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1773 * information.
1774 *
1775 * Also, use the unmasked value to clear interrupt as spurious
1776 * pending event on a dummy port might cause screaming IRQ.
1777 */
1778 writel(irq_stat, mmio + HOST_IRQ_STAT);
1779
1780 spin_unlock(&host->lock);
1781
1782 VPRINTK("EXIT\n");
1783
1784 return IRQ_RETVAL(handled);
1785}
1786EXPORT_SYMBOL_GPL(ahci_interrupt);
1787
1788static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1789{
1790 struct ata_port *ap = qc->ap;
1791 void __iomem *port_mmio = ahci_port_base(ap);
1792 struct ahci_port_priv *pp = ap->private_data;
1793
1794 /* Keep track of the currently active link. It will be used
1795 * in completion path to determine whether NCQ phase is in
1796 * progress.
1797 */
1798 pp->active_link = qc->dev->link;
1799
1800 if (qc->tf.protocol == ATA_PROT_NCQ)
1801 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1802
1803 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1804 u32 fbs = readl(port_mmio + PORT_FBS);
1805 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1806 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1807 writel(fbs, port_mmio + PORT_FBS);
1808 pp->fbs_last_dev = qc->dev->link->pmp;
1809 }
1810
1811 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1812
1813 ahci_sw_activity(qc->dev->link);
1814
1815 return 0;
1816}
1817
1818static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1819{
1820 struct ahci_port_priv *pp = qc->ap->private_data;
1821 u8 *rx_fis = pp->rx_fis;
1822
1823 if (pp->fbs_enabled)
1824 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1825
1826 /*
1827 * After a successful execution of an ATA PIO data-in command,
1828 * the device doesn't send D2H Reg FIS to update the TF and
1829 * the host should take TF and E_Status from the preceding PIO
1830 * Setup FIS.
1831 */
1832 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1833 !(qc->flags & ATA_QCFLAG_FAILED)) {
1834 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1835 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1836 } else
1837 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1838
1839 return true;
1840}
1841
1842static void ahci_freeze(struct ata_port *ap)
1843{
1844 void __iomem *port_mmio = ahci_port_base(ap);
1845
1846 /* turn IRQ off */
1847 writel(0, port_mmio + PORT_IRQ_MASK);
1848}
1849
1850static void ahci_thaw(struct ata_port *ap)
1851{
1852 struct ahci_host_priv *hpriv = ap->host->private_data;
1853 void __iomem *mmio = hpriv->mmio;
1854 void __iomem *port_mmio = ahci_port_base(ap);
1855 u32 tmp;
1856 struct ahci_port_priv *pp = ap->private_data;
1857
1858 /* clear IRQ */
1859 tmp = readl(port_mmio + PORT_IRQ_STAT);
1860 writel(tmp, port_mmio + PORT_IRQ_STAT);
1861 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1862
1863 /* turn IRQ back on */
1864 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1865}
1866
1867static void ahci_error_handler(struct ata_port *ap)
1868{
1869 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1870 /* restart engine */
1871 ahci_stop_engine(ap);
1872 ahci_start_engine(ap);
1873 }
1874
1875 sata_pmp_error_handler(ap);
1876
1877 if (!ata_dev_enabled(ap->link.device))
1878 ahci_stop_engine(ap);
1879}
1880
1881static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1882{
1883 struct ata_port *ap = qc->ap;
1884
1885 /* make DMA engine forget about the failed command */
1886 if (qc->flags & ATA_QCFLAG_FAILED)
1887 ahci_kick_engine(ap);
1888}
1889
1890static void ahci_enable_fbs(struct ata_port *ap)
1891{
1892 struct ahci_port_priv *pp = ap->private_data;
1893 void __iomem *port_mmio = ahci_port_base(ap);
1894 u32 fbs;
1895 int rc;
1896
1897 if (!pp->fbs_supported)
1898 return;
1899
1900 fbs = readl(port_mmio + PORT_FBS);
1901 if (fbs & PORT_FBS_EN) {
1902 pp->fbs_enabled = true;
1903 pp->fbs_last_dev = -1; /* initialization */
1904 return;
1905 }
1906
1907 rc = ahci_stop_engine(ap);
1908 if (rc)
1909 return;
1910
1911 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
1912 fbs = readl(port_mmio + PORT_FBS);
1913 if (fbs & PORT_FBS_EN) {
1914 dev_info(ap->host->dev, "FBS is enabled\n");
1915 pp->fbs_enabled = true;
1916 pp->fbs_last_dev = -1; /* initialization */
1917 } else
1918 dev_err(ap->host->dev, "Failed to enable FBS\n");
1919
1920 ahci_start_engine(ap);
1921}
1922
1923static void ahci_disable_fbs(struct ata_port *ap)
1924{
1925 struct ahci_port_priv *pp = ap->private_data;
1926 void __iomem *port_mmio = ahci_port_base(ap);
1927 u32 fbs;
1928 int rc;
1929
1930 if (!pp->fbs_supported)
1931 return;
1932
1933 fbs = readl(port_mmio + PORT_FBS);
1934 if ((fbs & PORT_FBS_EN) == 0) {
1935 pp->fbs_enabled = false;
1936 return;
1937 }
1938
1939 rc = ahci_stop_engine(ap);
1940 if (rc)
1941 return;
1942
1943 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
1944 fbs = readl(port_mmio + PORT_FBS);
1945 if (fbs & PORT_FBS_EN)
1946 dev_err(ap->host->dev, "Failed to disable FBS\n");
1947 else {
1948 dev_info(ap->host->dev, "FBS is disabled\n");
1949 pp->fbs_enabled = false;
1950 }
1951
1952 ahci_start_engine(ap);
1953}
1954
1955static void ahci_pmp_attach(struct ata_port *ap)
1956{
1957 void __iomem *port_mmio = ahci_port_base(ap);
1958 struct ahci_port_priv *pp = ap->private_data;
1959 u32 cmd;
1960
1961 cmd = readl(port_mmio + PORT_CMD);
1962 cmd |= PORT_CMD_PMP;
1963 writel(cmd, port_mmio + PORT_CMD);
1964
1965 ahci_enable_fbs(ap);
1966
1967 pp->intr_mask |= PORT_IRQ_BAD_PMP;
1968
1969 /*
1970 * We must not change the port interrupt mask register if the
1971 * port is marked frozen, the value in pp->intr_mask will be
1972 * restored later when the port is thawed.
1973 *
1974 * Note that during initialization, the port is marked as
1975 * frozen since the irq handler is not yet registered.
1976 */
1977 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1978 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1979}
1980
1981static void ahci_pmp_detach(struct ata_port *ap)
1982{
1983 void __iomem *port_mmio = ahci_port_base(ap);
1984 struct ahci_port_priv *pp = ap->private_data;
1985 u32 cmd;
1986
1987 ahci_disable_fbs(ap);
1988
1989 cmd = readl(port_mmio + PORT_CMD);
1990 cmd &= ~PORT_CMD_PMP;
1991 writel(cmd, port_mmio + PORT_CMD);
1992
1993 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
1994
1995 /* see comment above in ahci_pmp_attach() */
1996 if (!(ap->pflags & ATA_PFLAG_FROZEN))
1997 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1998}
1999
2000int ahci_port_resume(struct ata_port *ap)
2001{
2002 ahci_power_up(ap);
2003 ahci_start_port(ap);
2004
2005 if (sata_pmp_attached(ap))
2006 ahci_pmp_attach(ap);
2007 else
2008 ahci_pmp_detach(ap);
2009
2010 return 0;
2011}
2012EXPORT_SYMBOL_GPL(ahci_port_resume);
2013
2014#ifdef CONFIG_PM
2015static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2016{
2017 const char *emsg = NULL;
2018 int rc;
2019
2020 rc = ahci_deinit_port(ap, &emsg);
2021 if (rc == 0)
2022 ahci_power_down(ap);
2023 else {
2024 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2025 ahci_start_port(ap);
2026 }
2027
2028 return rc;
2029}
2030#endif
2031
2032static int ahci_port_start(struct ata_port *ap)
2033{
2034 struct ahci_host_priv *hpriv = ap->host->private_data;
2035 struct device *dev = ap->host->dev;
2036 struct ahci_port_priv *pp;
2037 void *mem;
2038 dma_addr_t mem_dma;
2039 size_t dma_sz, rx_fis_sz;
2040
2041 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2042 if (!pp)
2043 return -ENOMEM;
2044
2045 /* check FBS capability */
2046 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2047 void __iomem *port_mmio = ahci_port_base(ap);
2048 u32 cmd = readl(port_mmio + PORT_CMD);
2049 if (cmd & PORT_CMD_FBSCP)
2050 pp->fbs_supported = true;
2051 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2052 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2053 ap->port_no);
2054 pp->fbs_supported = true;
2055 } else
2056 dev_warn(dev, "port %d is not capable of FBS\n",
2057 ap->port_no);
2058 }
2059
2060 if (pp->fbs_supported) {
2061 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2062 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2063 } else {
2064 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2065 rx_fis_sz = AHCI_RX_FIS_SZ;
2066 }
2067
2068 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2069 if (!mem)
2070 return -ENOMEM;
2071 memset(mem, 0, dma_sz);
2072
2073 /*
2074 * First item in chunk of DMA memory: 32-slot command table,
2075 * 32 bytes each in size
2076 */
2077 pp->cmd_slot = mem;
2078 pp->cmd_slot_dma = mem_dma;
2079
2080 mem += AHCI_CMD_SLOT_SZ;
2081 mem_dma += AHCI_CMD_SLOT_SZ;
2082
2083 /*
2084 * Second item: Received-FIS area
2085 */
2086 pp->rx_fis = mem;
2087 pp->rx_fis_dma = mem_dma;
2088
2089 mem += rx_fis_sz;
2090 mem_dma += rx_fis_sz;
2091
2092 /*
2093 * Third item: data area for storing a single command
2094 * and its scatter-gather table
2095 */
2096 pp->cmd_tbl = mem;
2097 pp->cmd_tbl_dma = mem_dma;
2098
2099 /*
2100 * Save off initial list of interrupts to be enabled.
2101 * This could be changed later
2102 */
2103 pp->intr_mask = DEF_PORT_IRQ;
2104
2105 ap->private_data = pp;
2106
2107 /* engage engines, captain */
2108 return ahci_port_resume(ap);
2109}
2110
2111static void ahci_port_stop(struct ata_port *ap)
2112{
2113 const char *emsg = NULL;
2114 int rc;
2115
2116 /* de-initialize port */
2117 rc = ahci_deinit_port(ap, &emsg);
2118 if (rc)
2119 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2120}
2121
2122void ahci_print_info(struct ata_host *host, const char *scc_s)
2123{
2124 struct ahci_host_priv *hpriv = host->private_data;
2125 void __iomem *mmio = hpriv->mmio;
2126 u32 vers, cap, cap2, impl, speed;
2127 const char *speed_s;
2128
2129 vers = readl(mmio + HOST_VERSION);
2130 cap = hpriv->cap;
2131 cap2 = hpriv->cap2;
2132 impl = hpriv->port_map;
2133
2134 speed = (cap >> 20) & 0xf;
2135 if (speed == 1)
2136 speed_s = "1.5";
2137 else if (speed == 2)
2138 speed_s = "3";
2139 else if (speed == 3)
2140 speed_s = "6";
2141 else
2142 speed_s = "?";
2143
2144 dev_info(host->dev,
2145 "AHCI %02x%02x.%02x%02x "
2146 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2147 ,
2148
2149 (vers >> 24) & 0xff,
2150 (vers >> 16) & 0xff,
2151 (vers >> 8) & 0xff,
2152 vers & 0xff,
2153
2154 ((cap >> 8) & 0x1f) + 1,
2155 (cap & 0x1f) + 1,
2156 speed_s,
2157 impl,
2158 scc_s);
2159
2160 dev_info(host->dev,
2161 "flags: "
2162 "%s%s%s%s%s%s%s"
2163 "%s%s%s%s%s%s%s"
2164 "%s%s%s%s%s%s\n"
2165 ,
2166
2167 cap & HOST_CAP_64 ? "64bit " : "",
2168 cap & HOST_CAP_NCQ ? "ncq " : "",
2169 cap & HOST_CAP_SNTF ? "sntf " : "",
2170 cap & HOST_CAP_MPS ? "ilck " : "",
2171 cap & HOST_CAP_SSS ? "stag " : "",
2172 cap & HOST_CAP_ALPM ? "pm " : "",
2173 cap & HOST_CAP_LED ? "led " : "",
2174 cap & HOST_CAP_CLO ? "clo " : "",
2175 cap & HOST_CAP_ONLY ? "only " : "",
2176 cap & HOST_CAP_PMP ? "pmp " : "",
2177 cap & HOST_CAP_FBS ? "fbs " : "",
2178 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2179 cap & HOST_CAP_SSC ? "slum " : "",
2180 cap & HOST_CAP_PART ? "part " : "",
2181 cap & HOST_CAP_CCC ? "ccc " : "",
2182 cap & HOST_CAP_EMS ? "ems " : "",
2183 cap & HOST_CAP_SXS ? "sxs " : "",
2184 cap2 & HOST_CAP2_APST ? "apst " : "",
2185 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2186 cap2 & HOST_CAP2_BOH ? "boh " : ""
2187 );
2188}
2189EXPORT_SYMBOL_GPL(ahci_print_info);
2190
2191void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2192 struct ata_port_info *pi)
2193{
2194 u8 messages;
2195 void __iomem *mmio = hpriv->mmio;
2196 u32 em_loc = readl(mmio + HOST_EM_LOC);
2197 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2198
2199 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2200 return;
2201
2202 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2203
2204 if (messages) {
2205 /* store em_loc */
2206 hpriv->em_loc = ((em_loc >> 16) * 4);
2207 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2208 hpriv->em_msg_type = messages;
2209 pi->flags |= ATA_FLAG_EM;
2210 if (!(em_ctl & EM_CTL_ALHD))
2211 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2212 }
2213}
2214EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2215
2216MODULE_AUTHOR("Jeff Garzik");
2217MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2218MODULE_LICENSE("GPL");