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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ata / libahci.c
1 /*
2 * libahci.c - Common AHCI SATA low-level routines
3 *
4 * Maintained by: Tejun Heo <tj@kernel.org>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2004-2005 Red Hat, Inc.
9 *
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 *
26 * libata documentation is available via 'make {ps|pdf}docs',
27 * as Documentation/DocBook/libata.*
28 *
29 * AHCI hardware documentation:
30 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
31 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
32 *
33 */
34
35 #include <linux/kernel.h>
36 #include <linux/gfp.h>
37 #include <linux/module.h>
38 #include <linux/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 #include "libata.h"
49
50 static int ahci_skip_host_reset;
51 int ahci_ignore_sss;
52 EXPORT_SYMBOL_GPL(ahci_ignore_sss);
53
54 module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
55 MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
56
57 module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
58 MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
59
60 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
61 unsigned hints);
62 static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
63 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
64 size_t size);
65 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
66 ssize_t size);
67
68
69
70 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
71 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
72 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
73 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
74 static int ahci_port_start(struct ata_port *ap);
75 static void ahci_port_stop(struct ata_port *ap);
76 static void ahci_qc_prep(struct ata_queued_cmd *qc);
77 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
78 static void ahci_freeze(struct ata_port *ap);
79 static void ahci_thaw(struct ata_port *ap);
80 static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep);
81 static void ahci_enable_fbs(struct ata_port *ap);
82 static void ahci_disable_fbs(struct ata_port *ap);
83 static void ahci_pmp_attach(struct ata_port *ap);
84 static void ahci_pmp_detach(struct ata_port *ap);
85 static int ahci_softreset(struct ata_link *link, unsigned int *class,
86 unsigned long deadline);
87 static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
88 unsigned long deadline);
89 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
90 unsigned long deadline);
91 static void ahci_postreset(struct ata_link *link, unsigned int *class);
92 static void ahci_error_handler(struct ata_port *ap);
93 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
94 static void ahci_dev_config(struct ata_device *dev);
95 #ifdef CONFIG_PM
96 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
97 #endif
98 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
99 static ssize_t ahci_activity_store(struct ata_device *dev,
100 enum sw_activity val);
101 static void ahci_init_sw_activity(struct ata_link *link);
102
103 static ssize_t ahci_show_host_caps(struct device *dev,
104 struct device_attribute *attr, char *buf);
105 static ssize_t ahci_show_host_cap2(struct device *dev,
106 struct device_attribute *attr, char *buf);
107 static ssize_t ahci_show_host_version(struct device *dev,
108 struct device_attribute *attr, char *buf);
109 static ssize_t ahci_show_port_cmd(struct device *dev,
110 struct device_attribute *attr, char *buf);
111 static ssize_t ahci_read_em_buffer(struct device *dev,
112 struct device_attribute *attr, char *buf);
113 static ssize_t ahci_store_em_buffer(struct device *dev,
114 struct device_attribute *attr,
115 const char *buf, size_t size);
116 static ssize_t ahci_show_em_supported(struct device *dev,
117 struct device_attribute *attr, char *buf);
118
119 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
120 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
121 static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
122 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
123 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
124 ahci_read_em_buffer, ahci_store_em_buffer);
125 static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
126
127 struct device_attribute *ahci_shost_attrs[] = {
128 &dev_attr_link_power_management_policy,
129 &dev_attr_em_message_type,
130 &dev_attr_em_message,
131 &dev_attr_ahci_host_caps,
132 &dev_attr_ahci_host_cap2,
133 &dev_attr_ahci_host_version,
134 &dev_attr_ahci_port_cmd,
135 &dev_attr_em_buffer,
136 &dev_attr_em_message_supported,
137 NULL
138 };
139 EXPORT_SYMBOL_GPL(ahci_shost_attrs);
140
141 struct device_attribute *ahci_sdev_attrs[] = {
142 &dev_attr_sw_activity,
143 &dev_attr_unload_heads,
144 NULL
145 };
146 EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
147
148 struct ata_port_operations ahci_ops = {
149 .inherits = &sata_pmp_port_ops,
150
151 .qc_defer = ahci_pmp_qc_defer,
152 .qc_prep = ahci_qc_prep,
153 .qc_issue = ahci_qc_issue,
154 .qc_fill_rtf = ahci_qc_fill_rtf,
155
156 .freeze = ahci_freeze,
157 .thaw = ahci_thaw,
158 .softreset = ahci_softreset,
159 .hardreset = ahci_hardreset,
160 .postreset = ahci_postreset,
161 .pmp_softreset = ahci_softreset,
162 .error_handler = ahci_error_handler,
163 .post_internal_cmd = ahci_post_internal_cmd,
164 .dev_config = ahci_dev_config,
165
166 .scr_read = ahci_scr_read,
167 .scr_write = ahci_scr_write,
168 .pmp_attach = ahci_pmp_attach,
169 .pmp_detach = ahci_pmp_detach,
170
171 .set_lpm = ahci_set_lpm,
172 .em_show = ahci_led_show,
173 .em_store = ahci_led_store,
174 .sw_activity_show = ahci_activity_show,
175 .sw_activity_store = ahci_activity_store,
176 #ifdef CONFIG_PM
177 .port_suspend = ahci_port_suspend,
178 .port_resume = ahci_port_resume,
179 #endif
180 .port_start = ahci_port_start,
181 .port_stop = ahci_port_stop,
182 };
183 EXPORT_SYMBOL_GPL(ahci_ops);
184
185 struct ata_port_operations ahci_pmp_retry_srst_ops = {
186 .inherits = &ahci_ops,
187 .softreset = ahci_pmp_retry_softreset,
188 };
189 EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
190
191 int ahci_em_messages = 1;
192 EXPORT_SYMBOL_GPL(ahci_em_messages);
193 module_param(ahci_em_messages, int, 0444);
194 /* add other LED protocol types when they become supported */
195 MODULE_PARM_DESC(ahci_em_messages,
196 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
197
198 int devslp_idle_timeout = 1000; /* device sleep idle timeout in ms */
199 module_param(devslp_idle_timeout, int, 0644);
200 MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
201
202 static void ahci_enable_ahci(void __iomem *mmio)
203 {
204 int i;
205 u32 tmp;
206
207 /* turn on AHCI_EN */
208 tmp = readl(mmio + HOST_CTL);
209 if (tmp & HOST_AHCI_EN)
210 return;
211
212 /* Some controllers need AHCI_EN to be written multiple times.
213 * Try a few times before giving up.
214 */
215 for (i = 0; i < 5; i++) {
216 tmp |= HOST_AHCI_EN;
217 writel(tmp, mmio + HOST_CTL);
218 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
219 if (tmp & HOST_AHCI_EN)
220 return;
221 msleep(10);
222 }
223
224 WARN_ON(1);
225 }
226
227 static ssize_t ahci_show_host_caps(struct device *dev,
228 struct device_attribute *attr, char *buf)
229 {
230 struct Scsi_Host *shost = class_to_shost(dev);
231 struct ata_port *ap = ata_shost_to_port(shost);
232 struct ahci_host_priv *hpriv = ap->host->private_data;
233
234 return sprintf(buf, "%x\n", hpriv->cap);
235 }
236
237 static ssize_t ahci_show_host_cap2(struct device *dev,
238 struct device_attribute *attr, char *buf)
239 {
240 struct Scsi_Host *shost = class_to_shost(dev);
241 struct ata_port *ap = ata_shost_to_port(shost);
242 struct ahci_host_priv *hpriv = ap->host->private_data;
243
244 return sprintf(buf, "%x\n", hpriv->cap2);
245 }
246
247 static ssize_t ahci_show_host_version(struct device *dev,
248 struct device_attribute *attr, char *buf)
249 {
250 struct Scsi_Host *shost = class_to_shost(dev);
251 struct ata_port *ap = ata_shost_to_port(shost);
252 struct ahci_host_priv *hpriv = ap->host->private_data;
253 void __iomem *mmio = hpriv->mmio;
254
255 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
256 }
257
258 static ssize_t ahci_show_port_cmd(struct device *dev,
259 struct device_attribute *attr, char *buf)
260 {
261 struct Scsi_Host *shost = class_to_shost(dev);
262 struct ata_port *ap = ata_shost_to_port(shost);
263 void __iomem *port_mmio = ahci_port_base(ap);
264
265 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
266 }
267
268 static ssize_t ahci_read_em_buffer(struct device *dev,
269 struct device_attribute *attr, char *buf)
270 {
271 struct Scsi_Host *shost = class_to_shost(dev);
272 struct ata_port *ap = ata_shost_to_port(shost);
273 struct ahci_host_priv *hpriv = ap->host->private_data;
274 void __iomem *mmio = hpriv->mmio;
275 void __iomem *em_mmio = mmio + hpriv->em_loc;
276 u32 em_ctl, msg;
277 unsigned long flags;
278 size_t count;
279 int i;
280
281 spin_lock_irqsave(ap->lock, flags);
282
283 em_ctl = readl(mmio + HOST_EM_CTL);
284 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
285 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
286 spin_unlock_irqrestore(ap->lock, flags);
287 return -EINVAL;
288 }
289
290 if (!(em_ctl & EM_CTL_MR)) {
291 spin_unlock_irqrestore(ap->lock, flags);
292 return -EAGAIN;
293 }
294
295 if (!(em_ctl & EM_CTL_SMB))
296 em_mmio += hpriv->em_buf_sz;
297
298 count = hpriv->em_buf_sz;
299
300 /* the count should not be larger than PAGE_SIZE */
301 if (count > PAGE_SIZE) {
302 if (printk_ratelimit())
303 ata_port_warn(ap,
304 "EM read buffer size too large: "
305 "buffer size %u, page size %lu\n",
306 hpriv->em_buf_sz, PAGE_SIZE);
307 count = PAGE_SIZE;
308 }
309
310 for (i = 0; i < count; i += 4) {
311 msg = readl(em_mmio + i);
312 buf[i] = msg & 0xff;
313 buf[i + 1] = (msg >> 8) & 0xff;
314 buf[i + 2] = (msg >> 16) & 0xff;
315 buf[i + 3] = (msg >> 24) & 0xff;
316 }
317
318 spin_unlock_irqrestore(ap->lock, flags);
319
320 return i;
321 }
322
323 static ssize_t ahci_store_em_buffer(struct device *dev,
324 struct device_attribute *attr,
325 const char *buf, size_t size)
326 {
327 struct Scsi_Host *shost = class_to_shost(dev);
328 struct ata_port *ap = ata_shost_to_port(shost);
329 struct ahci_host_priv *hpriv = ap->host->private_data;
330 void __iomem *mmio = hpriv->mmio;
331 void __iomem *em_mmio = mmio + hpriv->em_loc;
332 const unsigned char *msg_buf = buf;
333 u32 em_ctl, msg;
334 unsigned long flags;
335 int i;
336
337 /* check size validity */
338 if (!(ap->flags & ATA_FLAG_EM) ||
339 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
340 size % 4 || size > hpriv->em_buf_sz)
341 return -EINVAL;
342
343 spin_lock_irqsave(ap->lock, flags);
344
345 em_ctl = readl(mmio + HOST_EM_CTL);
346 if (em_ctl & EM_CTL_TM) {
347 spin_unlock_irqrestore(ap->lock, flags);
348 return -EBUSY;
349 }
350
351 for (i = 0; i < size; i += 4) {
352 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
353 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
354 writel(msg, em_mmio + i);
355 }
356
357 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
358
359 spin_unlock_irqrestore(ap->lock, flags);
360
361 return size;
362 }
363
364 static ssize_t ahci_show_em_supported(struct device *dev,
365 struct device_attribute *attr, char *buf)
366 {
367 struct Scsi_Host *shost = class_to_shost(dev);
368 struct ata_port *ap = ata_shost_to_port(shost);
369 struct ahci_host_priv *hpriv = ap->host->private_data;
370 void __iomem *mmio = hpriv->mmio;
371 u32 em_ctl;
372
373 em_ctl = readl(mmio + HOST_EM_CTL);
374
375 return sprintf(buf, "%s%s%s%s\n",
376 em_ctl & EM_CTL_LED ? "led " : "",
377 em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
378 em_ctl & EM_CTL_SES ? "ses-2 " : "",
379 em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
380 }
381
382 /**
383 * ahci_save_initial_config - Save and fixup initial config values
384 * @dev: target AHCI device
385 * @hpriv: host private area to store config values
386 * @force_port_map: force port map to a specified value
387 * @mask_port_map: mask out particular bits from port map
388 *
389 * Some registers containing configuration info might be setup by
390 * BIOS and might be cleared on reset. This function saves the
391 * initial values of those registers into @hpriv such that they
392 * can be restored after controller reset.
393 *
394 * If inconsistent, config values are fixed up by this function.
395 *
396 * LOCKING:
397 * None.
398 */
399 void ahci_save_initial_config(struct device *dev,
400 struct ahci_host_priv *hpriv,
401 unsigned int force_port_map,
402 unsigned int mask_port_map)
403 {
404 void __iomem *mmio = hpriv->mmio;
405 u32 cap, cap2, vers, port_map;
406 int i;
407
408 /* make sure AHCI mode is enabled before accessing CAP */
409 ahci_enable_ahci(mmio);
410
411 /* Values prefixed with saved_ are written back to host after
412 * reset. Values without are used for driver operation.
413 */
414 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
415 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
416
417 /* CAP2 register is only defined for AHCI 1.2 and later */
418 vers = readl(mmio + HOST_VERSION);
419 if ((vers >> 16) > 1 ||
420 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
421 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
422 else
423 hpriv->saved_cap2 = cap2 = 0;
424
425 /* some chips have errata preventing 64bit use */
426 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
427 dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
428 cap &= ~HOST_CAP_64;
429 }
430
431 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
432 dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
433 cap &= ~HOST_CAP_NCQ;
434 }
435
436 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
437 dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
438 cap |= HOST_CAP_NCQ;
439 }
440
441 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
442 dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
443 cap &= ~HOST_CAP_PMP;
444 }
445
446 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
447 dev_info(dev,
448 "controller can't do SNTF, turning off CAP_SNTF\n");
449 cap &= ~HOST_CAP_SNTF;
450 }
451
452 if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
453 dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
454 cap |= HOST_CAP_FBS;
455 }
456
457 if (force_port_map && port_map != force_port_map) {
458 dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
459 port_map, force_port_map);
460 port_map = force_port_map;
461 }
462
463 if (mask_port_map) {
464 dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
465 port_map,
466 port_map & mask_port_map);
467 port_map &= mask_port_map;
468 }
469
470 /* cross check port_map and cap.n_ports */
471 if (port_map) {
472 int map_ports = 0;
473
474 for (i = 0; i < AHCI_MAX_PORTS; i++)
475 if (port_map & (1 << i))
476 map_ports++;
477
478 /* If PI has more ports than n_ports, whine, clear
479 * port_map and let it be generated from n_ports.
480 */
481 if (map_ports > ahci_nr_ports(cap)) {
482 dev_warn(dev,
483 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
484 port_map, ahci_nr_ports(cap));
485 port_map = 0;
486 }
487 }
488
489 /* fabricate port_map from cap.nr_ports */
490 if (!port_map) {
491 port_map = (1 << ahci_nr_ports(cap)) - 1;
492 dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
493
494 /* write the fixed up value to the PI register */
495 hpriv->saved_port_map = port_map;
496 }
497
498 /* record values to use during operation */
499 hpriv->cap = cap;
500 hpriv->cap2 = cap2;
501 hpriv->port_map = port_map;
502 }
503 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
504
505 /**
506 * ahci_restore_initial_config - Restore initial config
507 * @host: target ATA host
508 *
509 * Restore initial config stored by ahci_save_initial_config().
510 *
511 * LOCKING:
512 * None.
513 */
514 static void ahci_restore_initial_config(struct ata_host *host)
515 {
516 struct ahci_host_priv *hpriv = host->private_data;
517 void __iomem *mmio = hpriv->mmio;
518
519 writel(hpriv->saved_cap, mmio + HOST_CAP);
520 if (hpriv->saved_cap2)
521 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
522 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
523 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
524 }
525
526 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
527 {
528 static const int offset[] = {
529 [SCR_STATUS] = PORT_SCR_STAT,
530 [SCR_CONTROL] = PORT_SCR_CTL,
531 [SCR_ERROR] = PORT_SCR_ERR,
532 [SCR_ACTIVE] = PORT_SCR_ACT,
533 [SCR_NOTIFICATION] = PORT_SCR_NTF,
534 };
535 struct ahci_host_priv *hpriv = ap->host->private_data;
536
537 if (sc_reg < ARRAY_SIZE(offset) &&
538 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
539 return offset[sc_reg];
540 return 0;
541 }
542
543 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
544 {
545 void __iomem *port_mmio = ahci_port_base(link->ap);
546 int offset = ahci_scr_offset(link->ap, sc_reg);
547
548 if (offset) {
549 *val = readl(port_mmio + offset);
550 return 0;
551 }
552 return -EINVAL;
553 }
554
555 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
556 {
557 void __iomem *port_mmio = ahci_port_base(link->ap);
558 int offset = ahci_scr_offset(link->ap, sc_reg);
559
560 if (offset) {
561 writel(val, port_mmio + offset);
562 return 0;
563 }
564 return -EINVAL;
565 }
566
567 void ahci_start_engine(struct ata_port *ap)
568 {
569 void __iomem *port_mmio = ahci_port_base(ap);
570 u32 tmp;
571
572 /* start DMA */
573 tmp = readl(port_mmio + PORT_CMD);
574 tmp |= PORT_CMD_START;
575 writel(tmp, port_mmio + PORT_CMD);
576 readl(port_mmio + PORT_CMD); /* flush */
577 }
578 EXPORT_SYMBOL_GPL(ahci_start_engine);
579
580 int ahci_stop_engine(struct ata_port *ap)
581 {
582 void __iomem *port_mmio = ahci_port_base(ap);
583 u32 tmp;
584
585 tmp = readl(port_mmio + PORT_CMD);
586
587 /* check if the HBA is idle */
588 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
589 return 0;
590
591 /* setting HBA to idle */
592 tmp &= ~PORT_CMD_START;
593 writel(tmp, port_mmio + PORT_CMD);
594
595 /* wait for engine to stop. This could be as long as 500 msec */
596 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
597 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
598 if (tmp & PORT_CMD_LIST_ON)
599 return -EIO;
600
601 return 0;
602 }
603 EXPORT_SYMBOL_GPL(ahci_stop_engine);
604
605 static void ahci_start_fis_rx(struct ata_port *ap)
606 {
607 void __iomem *port_mmio = ahci_port_base(ap);
608 struct ahci_host_priv *hpriv = ap->host->private_data;
609 struct ahci_port_priv *pp = ap->private_data;
610 u32 tmp;
611
612 /* set FIS registers */
613 if (hpriv->cap & HOST_CAP_64)
614 writel((pp->cmd_slot_dma >> 16) >> 16,
615 port_mmio + PORT_LST_ADDR_HI);
616 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
617
618 if (hpriv->cap & HOST_CAP_64)
619 writel((pp->rx_fis_dma >> 16) >> 16,
620 port_mmio + PORT_FIS_ADDR_HI);
621 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
622
623 /* enable FIS reception */
624 tmp = readl(port_mmio + PORT_CMD);
625 tmp |= PORT_CMD_FIS_RX;
626 writel(tmp, port_mmio + PORT_CMD);
627
628 /* flush */
629 readl(port_mmio + PORT_CMD);
630 }
631
632 static int ahci_stop_fis_rx(struct ata_port *ap)
633 {
634 void __iomem *port_mmio = ahci_port_base(ap);
635 u32 tmp;
636
637 /* disable FIS reception */
638 tmp = readl(port_mmio + PORT_CMD);
639 tmp &= ~PORT_CMD_FIS_RX;
640 writel(tmp, port_mmio + PORT_CMD);
641
642 /* wait for completion, spec says 500ms, give it 1000 */
643 tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
644 PORT_CMD_FIS_ON, 10, 1000);
645 if (tmp & PORT_CMD_FIS_ON)
646 return -EBUSY;
647
648 return 0;
649 }
650
651 static void ahci_power_up(struct ata_port *ap)
652 {
653 struct ahci_host_priv *hpriv = ap->host->private_data;
654 void __iomem *port_mmio = ahci_port_base(ap);
655 u32 cmd;
656
657 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
658
659 /* spin up device */
660 if (hpriv->cap & HOST_CAP_SSS) {
661 cmd |= PORT_CMD_SPIN_UP;
662 writel(cmd, port_mmio + PORT_CMD);
663 }
664
665 /* wake up link */
666 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
667 }
668
669 static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
670 unsigned int hints)
671 {
672 struct ata_port *ap = link->ap;
673 struct ahci_host_priv *hpriv = ap->host->private_data;
674 struct ahci_port_priv *pp = ap->private_data;
675 void __iomem *port_mmio = ahci_port_base(ap);
676
677 if (policy != ATA_LPM_MAX_POWER) {
678 /*
679 * Disable interrupts on Phy Ready. This keeps us from
680 * getting woken up due to spurious phy ready
681 * interrupts.
682 */
683 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
684 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
685
686 sata_link_scr_lpm(link, policy, false);
687 }
688
689 if (hpriv->cap & HOST_CAP_ALPM) {
690 u32 cmd = readl(port_mmio + PORT_CMD);
691
692 if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
693 cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
694 cmd |= PORT_CMD_ICC_ACTIVE;
695
696 writel(cmd, port_mmio + PORT_CMD);
697 readl(port_mmio + PORT_CMD);
698
699 /* wait 10ms to be sure we've come out of LPM state */
700 ata_msleep(ap, 10);
701 } else {
702 cmd |= PORT_CMD_ALPE;
703 if (policy == ATA_LPM_MIN_POWER)
704 cmd |= PORT_CMD_ASP;
705
706 /* write out new cmd value */
707 writel(cmd, port_mmio + PORT_CMD);
708 }
709 }
710
711 /* set aggressive device sleep */
712 if ((hpriv->cap2 & HOST_CAP2_SDS) &&
713 (hpriv->cap2 & HOST_CAP2_SADM) &&
714 (link->device->flags & ATA_DFLAG_DEVSLP)) {
715 if (policy == ATA_LPM_MIN_POWER)
716 ahci_set_aggressive_devslp(ap, true);
717 else
718 ahci_set_aggressive_devslp(ap, false);
719 }
720
721 if (policy == ATA_LPM_MAX_POWER) {
722 sata_link_scr_lpm(link, policy, false);
723
724 /* turn PHYRDY IRQ back on */
725 pp->intr_mask |= PORT_IRQ_PHYRDY;
726 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
727 }
728
729 return 0;
730 }
731
732 #ifdef CONFIG_PM
733 static void ahci_power_down(struct ata_port *ap)
734 {
735 struct ahci_host_priv *hpriv = ap->host->private_data;
736 void __iomem *port_mmio = ahci_port_base(ap);
737 u32 cmd, scontrol;
738
739 if (!(hpriv->cap & HOST_CAP_SSS))
740 return;
741
742 /* put device into listen mode, first set PxSCTL.DET to 0 */
743 scontrol = readl(port_mmio + PORT_SCR_CTL);
744 scontrol &= ~0xf;
745 writel(scontrol, port_mmio + PORT_SCR_CTL);
746
747 /* then set PxCMD.SUD to 0 */
748 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
749 cmd &= ~PORT_CMD_SPIN_UP;
750 writel(cmd, port_mmio + PORT_CMD);
751 }
752 #endif
753
754 static void ahci_start_port(struct ata_port *ap)
755 {
756 struct ahci_host_priv *hpriv = ap->host->private_data;
757 struct ahci_port_priv *pp = ap->private_data;
758 struct ata_link *link;
759 struct ahci_em_priv *emp;
760 ssize_t rc;
761 int i;
762
763 /* enable FIS reception */
764 ahci_start_fis_rx(ap);
765
766 /* enable DMA */
767 if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
768 ahci_start_engine(ap);
769
770 /* turn on LEDs */
771 if (ap->flags & ATA_FLAG_EM) {
772 ata_for_each_link(link, ap, EDGE) {
773 emp = &pp->em_priv[link->pmp];
774
775 /* EM Transmit bit maybe busy during init */
776 for (i = 0; i < EM_MAX_RETRY; i++) {
777 rc = ahci_transmit_led_message(ap,
778 emp->led_state,
779 4);
780 if (rc == -EBUSY)
781 ata_msleep(ap, 1);
782 else
783 break;
784 }
785 }
786 }
787
788 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
789 ata_for_each_link(link, ap, EDGE)
790 ahci_init_sw_activity(link);
791
792 }
793
794 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
795 {
796 int rc;
797
798 /* disable DMA */
799 rc = ahci_stop_engine(ap);
800 if (rc) {
801 *emsg = "failed to stop engine";
802 return rc;
803 }
804
805 /* disable FIS reception */
806 rc = ahci_stop_fis_rx(ap);
807 if (rc) {
808 *emsg = "failed stop FIS RX";
809 return rc;
810 }
811
812 return 0;
813 }
814
815 int ahci_reset_controller(struct ata_host *host)
816 {
817 struct ahci_host_priv *hpriv = host->private_data;
818 void __iomem *mmio = hpriv->mmio;
819 u32 tmp;
820
821 /* we must be in AHCI mode, before using anything
822 * AHCI-specific, such as HOST_RESET.
823 */
824 ahci_enable_ahci(mmio);
825
826 /* global controller reset */
827 if (!ahci_skip_host_reset) {
828 tmp = readl(mmio + HOST_CTL);
829 if ((tmp & HOST_RESET) == 0) {
830 writel(tmp | HOST_RESET, mmio + HOST_CTL);
831 readl(mmio + HOST_CTL); /* flush */
832 }
833
834 /*
835 * to perform host reset, OS should set HOST_RESET
836 * and poll until this bit is read to be "0".
837 * reset must complete within 1 second, or
838 * the hardware should be considered fried.
839 */
840 tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
841 HOST_RESET, 10, 1000);
842
843 if (tmp & HOST_RESET) {
844 dev_err(host->dev, "controller reset failed (0x%x)\n",
845 tmp);
846 return -EIO;
847 }
848
849 /* turn on AHCI mode */
850 ahci_enable_ahci(mmio);
851
852 /* Some registers might be cleared on reset. Restore
853 * initial values.
854 */
855 ahci_restore_initial_config(host);
856 } else
857 dev_info(host->dev, "skipping global host reset\n");
858
859 return 0;
860 }
861 EXPORT_SYMBOL_GPL(ahci_reset_controller);
862
863 static void ahci_sw_activity(struct ata_link *link)
864 {
865 struct ata_port *ap = link->ap;
866 struct ahci_port_priv *pp = ap->private_data;
867 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
868
869 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
870 return;
871
872 emp->activity++;
873 if (!timer_pending(&emp->timer))
874 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
875 }
876
877 static void ahci_sw_activity_blink(unsigned long arg)
878 {
879 struct ata_link *link = (struct ata_link *)arg;
880 struct ata_port *ap = link->ap;
881 struct ahci_port_priv *pp = ap->private_data;
882 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
883 unsigned long led_message = emp->led_state;
884 u32 activity_led_state;
885 unsigned long flags;
886
887 led_message &= EM_MSG_LED_VALUE;
888 led_message |= ap->port_no | (link->pmp << 8);
889
890 /* check to see if we've had activity. If so,
891 * toggle state of LED and reset timer. If not,
892 * turn LED to desired idle state.
893 */
894 spin_lock_irqsave(ap->lock, flags);
895 if (emp->saved_activity != emp->activity) {
896 emp->saved_activity = emp->activity;
897 /* get the current LED state */
898 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
899
900 if (activity_led_state)
901 activity_led_state = 0;
902 else
903 activity_led_state = 1;
904
905 /* clear old state */
906 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
907
908 /* toggle state */
909 led_message |= (activity_led_state << 16);
910 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
911 } else {
912 /* switch to idle */
913 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
914 if (emp->blink_policy == BLINK_OFF)
915 led_message |= (1 << 16);
916 }
917 spin_unlock_irqrestore(ap->lock, flags);
918 ahci_transmit_led_message(ap, led_message, 4);
919 }
920
921 static void ahci_init_sw_activity(struct ata_link *link)
922 {
923 struct ata_port *ap = link->ap;
924 struct ahci_port_priv *pp = ap->private_data;
925 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
926
927 /* init activity stats, setup timer */
928 emp->saved_activity = emp->activity = 0;
929 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
930
931 /* check our blink policy and set flag for link if it's enabled */
932 if (emp->blink_policy)
933 link->flags |= ATA_LFLAG_SW_ACTIVITY;
934 }
935
936 int ahci_reset_em(struct ata_host *host)
937 {
938 struct ahci_host_priv *hpriv = host->private_data;
939 void __iomem *mmio = hpriv->mmio;
940 u32 em_ctl;
941
942 em_ctl = readl(mmio + HOST_EM_CTL);
943 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
944 return -EINVAL;
945
946 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
947 return 0;
948 }
949 EXPORT_SYMBOL_GPL(ahci_reset_em);
950
951 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
952 ssize_t size)
953 {
954 struct ahci_host_priv *hpriv = ap->host->private_data;
955 struct ahci_port_priv *pp = ap->private_data;
956 void __iomem *mmio = hpriv->mmio;
957 u32 em_ctl;
958 u32 message[] = {0, 0};
959 unsigned long flags;
960 int pmp;
961 struct ahci_em_priv *emp;
962
963 /* get the slot number from the message */
964 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
965 if (pmp < EM_MAX_SLOTS)
966 emp = &pp->em_priv[pmp];
967 else
968 return -EINVAL;
969
970 spin_lock_irqsave(ap->lock, flags);
971
972 /*
973 * if we are still busy transmitting a previous message,
974 * do not allow
975 */
976 em_ctl = readl(mmio + HOST_EM_CTL);
977 if (em_ctl & EM_CTL_TM) {
978 spin_unlock_irqrestore(ap->lock, flags);
979 return -EBUSY;
980 }
981
982 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
983 /*
984 * create message header - this is all zero except for
985 * the message size, which is 4 bytes.
986 */
987 message[0] |= (4 << 8);
988
989 /* ignore 0:4 of byte zero, fill in port info yourself */
990 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
991
992 /* write message to EM_LOC */
993 writel(message[0], mmio + hpriv->em_loc);
994 writel(message[1], mmio + hpriv->em_loc+4);
995
996 /*
997 * tell hardware to transmit the message
998 */
999 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1000 }
1001
1002 /* save off new led state for port/slot */
1003 emp->led_state = state;
1004
1005 spin_unlock_irqrestore(ap->lock, flags);
1006 return size;
1007 }
1008
1009 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1010 {
1011 struct ahci_port_priv *pp = ap->private_data;
1012 struct ata_link *link;
1013 struct ahci_em_priv *emp;
1014 int rc = 0;
1015
1016 ata_for_each_link(link, ap, EDGE) {
1017 emp = &pp->em_priv[link->pmp];
1018 rc += sprintf(buf, "%lx\n", emp->led_state);
1019 }
1020 return rc;
1021 }
1022
1023 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1024 size_t size)
1025 {
1026 int state;
1027 int pmp;
1028 struct ahci_port_priv *pp = ap->private_data;
1029 struct ahci_em_priv *emp;
1030
1031 state = simple_strtoul(buf, NULL, 0);
1032
1033 /* get the slot number from the message */
1034 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1035 if (pmp < EM_MAX_SLOTS)
1036 emp = &pp->em_priv[pmp];
1037 else
1038 return -EINVAL;
1039
1040 /* mask off the activity bits if we are in sw_activity
1041 * mode, user should turn off sw_activity before setting
1042 * activity led through em_message
1043 */
1044 if (emp->blink_policy)
1045 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1046
1047 return ahci_transmit_led_message(ap, state, size);
1048 }
1049
1050 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1051 {
1052 struct ata_link *link = dev->link;
1053 struct ata_port *ap = link->ap;
1054 struct ahci_port_priv *pp = ap->private_data;
1055 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1056 u32 port_led_state = emp->led_state;
1057
1058 /* save the desired Activity LED behavior */
1059 if (val == OFF) {
1060 /* clear LFLAG */
1061 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1062
1063 /* set the LED to OFF */
1064 port_led_state &= EM_MSG_LED_VALUE_OFF;
1065 port_led_state |= (ap->port_no | (link->pmp << 8));
1066 ahci_transmit_led_message(ap, port_led_state, 4);
1067 } else {
1068 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1069 if (val == BLINK_OFF) {
1070 /* set LED to ON for idle */
1071 port_led_state &= EM_MSG_LED_VALUE_OFF;
1072 port_led_state |= (ap->port_no | (link->pmp << 8));
1073 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1074 ahci_transmit_led_message(ap, port_led_state, 4);
1075 }
1076 }
1077 emp->blink_policy = val;
1078 return 0;
1079 }
1080
1081 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1082 {
1083 struct ata_link *link = dev->link;
1084 struct ata_port *ap = link->ap;
1085 struct ahci_port_priv *pp = ap->private_data;
1086 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1087
1088 /* display the saved value of activity behavior for this
1089 * disk.
1090 */
1091 return sprintf(buf, "%d\n", emp->blink_policy);
1092 }
1093
1094 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1095 int port_no, void __iomem *mmio,
1096 void __iomem *port_mmio)
1097 {
1098 const char *emsg = NULL;
1099 int rc;
1100 u32 tmp;
1101
1102 /* make sure port is not active */
1103 rc = ahci_deinit_port(ap, &emsg);
1104 if (rc)
1105 dev_warn(dev, "%s (%d)\n", emsg, rc);
1106
1107 /* clear SError */
1108 tmp = readl(port_mmio + PORT_SCR_ERR);
1109 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1110 writel(tmp, port_mmio + PORT_SCR_ERR);
1111
1112 /* clear port IRQ */
1113 tmp = readl(port_mmio + PORT_IRQ_STAT);
1114 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1115 if (tmp)
1116 writel(tmp, port_mmio + PORT_IRQ_STAT);
1117
1118 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1119 }
1120
1121 void ahci_init_controller(struct ata_host *host)
1122 {
1123 struct ahci_host_priv *hpriv = host->private_data;
1124 void __iomem *mmio = hpriv->mmio;
1125 int i;
1126 void __iomem *port_mmio;
1127 u32 tmp;
1128
1129 for (i = 0; i < host->n_ports; i++) {
1130 struct ata_port *ap = host->ports[i];
1131
1132 port_mmio = ahci_port_base(ap);
1133 if (ata_port_is_dummy(ap))
1134 continue;
1135
1136 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1137 }
1138
1139 tmp = readl(mmio + HOST_CTL);
1140 VPRINTK("HOST_CTL 0x%x\n", tmp);
1141 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1142 tmp = readl(mmio + HOST_CTL);
1143 VPRINTK("HOST_CTL 0x%x\n", tmp);
1144 }
1145 EXPORT_SYMBOL_GPL(ahci_init_controller);
1146
1147 static void ahci_dev_config(struct ata_device *dev)
1148 {
1149 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1150
1151 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1152 dev->max_sectors = 255;
1153 ata_dev_info(dev,
1154 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1155 }
1156 }
1157
1158 unsigned int ahci_dev_classify(struct ata_port *ap)
1159 {
1160 void __iomem *port_mmio = ahci_port_base(ap);
1161 struct ata_taskfile tf;
1162 u32 tmp;
1163
1164 tmp = readl(port_mmio + PORT_SIG);
1165 tf.lbah = (tmp >> 24) & 0xff;
1166 tf.lbam = (tmp >> 16) & 0xff;
1167 tf.lbal = (tmp >> 8) & 0xff;
1168 tf.nsect = (tmp) & 0xff;
1169
1170 return ata_dev_classify(&tf);
1171 }
1172 EXPORT_SYMBOL_GPL(ahci_dev_classify);
1173
1174 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1175 u32 opts)
1176 {
1177 dma_addr_t cmd_tbl_dma;
1178
1179 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1180
1181 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1182 pp->cmd_slot[tag].status = 0;
1183 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1184 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1185 }
1186 EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1187
1188 int ahci_kick_engine(struct ata_port *ap)
1189 {
1190 void __iomem *port_mmio = ahci_port_base(ap);
1191 struct ahci_host_priv *hpriv = ap->host->private_data;
1192 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1193 u32 tmp;
1194 int busy, rc;
1195
1196 /* stop engine */
1197 rc = ahci_stop_engine(ap);
1198 if (rc)
1199 goto out_restart;
1200
1201 /* need to do CLO?
1202 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1203 */
1204 busy = status & (ATA_BUSY | ATA_DRQ);
1205 if (!busy && !sata_pmp_attached(ap)) {
1206 rc = 0;
1207 goto out_restart;
1208 }
1209
1210 if (!(hpriv->cap & HOST_CAP_CLO)) {
1211 rc = -EOPNOTSUPP;
1212 goto out_restart;
1213 }
1214
1215 /* perform CLO */
1216 tmp = readl(port_mmio + PORT_CMD);
1217 tmp |= PORT_CMD_CLO;
1218 writel(tmp, port_mmio + PORT_CMD);
1219
1220 rc = 0;
1221 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1222 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1223 if (tmp & PORT_CMD_CLO)
1224 rc = -EIO;
1225
1226 /* restart engine */
1227 out_restart:
1228 ahci_start_engine(ap);
1229 return rc;
1230 }
1231 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1232
1233 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1234 struct ata_taskfile *tf, int is_cmd, u16 flags,
1235 unsigned long timeout_msec)
1236 {
1237 const u32 cmd_fis_len = 5; /* five dwords */
1238 struct ahci_port_priv *pp = ap->private_data;
1239 void __iomem *port_mmio = ahci_port_base(ap);
1240 u8 *fis = pp->cmd_tbl;
1241 u32 tmp;
1242
1243 /* prep the command */
1244 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1245 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1246
1247 /* issue & wait */
1248 writel(1, port_mmio + PORT_CMD_ISSUE);
1249
1250 if (timeout_msec) {
1251 tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1252 0x1, 0x1, 1, timeout_msec);
1253 if (tmp & 0x1) {
1254 ahci_kick_engine(ap);
1255 return -EBUSY;
1256 }
1257 } else
1258 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1259
1260 return 0;
1261 }
1262
1263 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1264 int pmp, unsigned long deadline,
1265 int (*check_ready)(struct ata_link *link))
1266 {
1267 struct ata_port *ap = link->ap;
1268 struct ahci_host_priv *hpriv = ap->host->private_data;
1269 const char *reason = NULL;
1270 unsigned long now, msecs;
1271 struct ata_taskfile tf;
1272 int rc;
1273
1274 DPRINTK("ENTER\n");
1275
1276 /* prepare for SRST (AHCI-1.1 10.4.1) */
1277 rc = ahci_kick_engine(ap);
1278 if (rc && rc != -EOPNOTSUPP)
1279 ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1280
1281 ata_tf_init(link->device, &tf);
1282
1283 /* issue the first D2H Register FIS */
1284 msecs = 0;
1285 now = jiffies;
1286 if (time_after(deadline, now))
1287 msecs = jiffies_to_msecs(deadline - now);
1288
1289 tf.ctl |= ATA_SRST;
1290 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1291 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1292 rc = -EIO;
1293 reason = "1st FIS failed";
1294 goto fail;
1295 }
1296
1297 /* spec says at least 5us, but be generous and sleep for 1ms */
1298 ata_msleep(ap, 1);
1299
1300 /* issue the second D2H Register FIS */
1301 tf.ctl &= ~ATA_SRST;
1302 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1303
1304 /* wait for link to become ready */
1305 rc = ata_wait_after_reset(link, deadline, check_ready);
1306 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1307 /*
1308 * Workaround for cases where link online status can't
1309 * be trusted. Treat device readiness timeout as link
1310 * offline.
1311 */
1312 ata_link_info(link, "device not ready, treating as offline\n");
1313 *class = ATA_DEV_NONE;
1314 } else if (rc) {
1315 /* link occupied, -ENODEV too is an error */
1316 reason = "device not ready";
1317 goto fail;
1318 } else
1319 *class = ahci_dev_classify(ap);
1320
1321 DPRINTK("EXIT, class=%u\n", *class);
1322 return 0;
1323
1324 fail:
1325 ata_link_err(link, "softreset failed (%s)\n", reason);
1326 return rc;
1327 }
1328
1329 int ahci_check_ready(struct ata_link *link)
1330 {
1331 void __iomem *port_mmio = ahci_port_base(link->ap);
1332 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1333
1334 return ata_check_ready(status);
1335 }
1336 EXPORT_SYMBOL_GPL(ahci_check_ready);
1337
1338 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1339 unsigned long deadline)
1340 {
1341 int pmp = sata_srst_pmp(link);
1342
1343 DPRINTK("ENTER\n");
1344
1345 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1346 }
1347 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1348
1349 static int ahci_bad_pmp_check_ready(struct ata_link *link)
1350 {
1351 void __iomem *port_mmio = ahci_port_base(link->ap);
1352 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1353 u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1354
1355 /*
1356 * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1357 * which can save timeout delay.
1358 */
1359 if (irq_status & PORT_IRQ_BAD_PMP)
1360 return -EIO;
1361
1362 return ata_check_ready(status);
1363 }
1364
1365 int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1366 unsigned long deadline)
1367 {
1368 struct ata_port *ap = link->ap;
1369 void __iomem *port_mmio = ahci_port_base(ap);
1370 int pmp = sata_srst_pmp(link);
1371 int rc;
1372 u32 irq_sts;
1373
1374 DPRINTK("ENTER\n");
1375
1376 rc = ahci_do_softreset(link, class, pmp, deadline,
1377 ahci_bad_pmp_check_ready);
1378
1379 /*
1380 * Soft reset fails with IPMS set when PMP is enabled but
1381 * SATA HDD/ODD is connected to SATA port, do soft reset
1382 * again to port 0.
1383 */
1384 if (rc == -EIO) {
1385 irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1386 if (irq_sts & PORT_IRQ_BAD_PMP) {
1387 ata_link_warn(link,
1388 "applying PMP SRST workaround "
1389 "and retrying\n");
1390 rc = ahci_do_softreset(link, class, 0, deadline,
1391 ahci_check_ready);
1392 }
1393 }
1394
1395 return rc;
1396 }
1397
1398 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1399 unsigned long deadline)
1400 {
1401 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1402 struct ata_port *ap = link->ap;
1403 struct ahci_port_priv *pp = ap->private_data;
1404 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1405 struct ata_taskfile tf;
1406 bool online;
1407 int rc;
1408
1409 DPRINTK("ENTER\n");
1410
1411 ahci_stop_engine(ap);
1412
1413 /* clear D2H reception area to properly wait for D2H FIS */
1414 ata_tf_init(link->device, &tf);
1415 tf.command = 0x80;
1416 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1417
1418 rc = sata_link_hardreset(link, timing, deadline, &online,
1419 ahci_check_ready);
1420
1421 ahci_start_engine(ap);
1422
1423 if (online)
1424 *class = ahci_dev_classify(ap);
1425
1426 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1427 return rc;
1428 }
1429
1430 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1431 {
1432 struct ata_port *ap = link->ap;
1433 void __iomem *port_mmio = ahci_port_base(ap);
1434 u32 new_tmp, tmp;
1435
1436 ata_std_postreset(link, class);
1437
1438 /* Make sure port's ATAPI bit is set appropriately */
1439 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1440 if (*class == ATA_DEV_ATAPI)
1441 new_tmp |= PORT_CMD_ATAPI;
1442 else
1443 new_tmp &= ~PORT_CMD_ATAPI;
1444 if (new_tmp != tmp) {
1445 writel(new_tmp, port_mmio + PORT_CMD);
1446 readl(port_mmio + PORT_CMD); /* flush */
1447 }
1448 }
1449
1450 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1451 {
1452 struct scatterlist *sg;
1453 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1454 unsigned int si;
1455
1456 VPRINTK("ENTER\n");
1457
1458 /*
1459 * Next, the S/G list.
1460 */
1461 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1462 dma_addr_t addr = sg_dma_address(sg);
1463 u32 sg_len = sg_dma_len(sg);
1464
1465 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1466 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1467 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1468 }
1469
1470 return si;
1471 }
1472
1473 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1474 {
1475 struct ata_port *ap = qc->ap;
1476 struct ahci_port_priv *pp = ap->private_data;
1477
1478 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1479 return ata_std_qc_defer(qc);
1480 else
1481 return sata_pmp_qc_defer_cmd_switch(qc);
1482 }
1483
1484 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1485 {
1486 struct ata_port *ap = qc->ap;
1487 struct ahci_port_priv *pp = ap->private_data;
1488 int is_atapi = ata_is_atapi(qc->tf.protocol);
1489 void *cmd_tbl;
1490 u32 opts;
1491 const u32 cmd_fis_len = 5; /* five dwords */
1492 unsigned int n_elem;
1493
1494 /*
1495 * Fill in command table information. First, the header,
1496 * a SATA Register - Host to Device command FIS.
1497 */
1498 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1499
1500 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1501 if (is_atapi) {
1502 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1503 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1504 }
1505
1506 n_elem = 0;
1507 if (qc->flags & ATA_QCFLAG_DMAMAP)
1508 n_elem = ahci_fill_sg(qc, cmd_tbl);
1509
1510 /*
1511 * Fill in command slot information.
1512 */
1513 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1514 if (qc->tf.flags & ATA_TFLAG_WRITE)
1515 opts |= AHCI_CMD_WRITE;
1516 if (is_atapi)
1517 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1518
1519 ahci_fill_cmd_slot(pp, qc->tag, opts);
1520 }
1521
1522 static void ahci_fbs_dec_intr(struct ata_port *ap)
1523 {
1524 struct ahci_port_priv *pp = ap->private_data;
1525 void __iomem *port_mmio = ahci_port_base(ap);
1526 u32 fbs = readl(port_mmio + PORT_FBS);
1527 int retries = 3;
1528
1529 DPRINTK("ENTER\n");
1530 BUG_ON(!pp->fbs_enabled);
1531
1532 /* time to wait for DEC is not specified by AHCI spec,
1533 * add a retry loop for safety.
1534 */
1535 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1536 fbs = readl(port_mmio + PORT_FBS);
1537 while ((fbs & PORT_FBS_DEC) && retries--) {
1538 udelay(1);
1539 fbs = readl(port_mmio + PORT_FBS);
1540 }
1541
1542 if (fbs & PORT_FBS_DEC)
1543 dev_err(ap->host->dev, "failed to clear device error\n");
1544 }
1545
1546 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1547 {
1548 struct ahci_host_priv *hpriv = ap->host->private_data;
1549 struct ahci_port_priv *pp = ap->private_data;
1550 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1551 struct ata_link *link = NULL;
1552 struct ata_queued_cmd *active_qc;
1553 struct ata_eh_info *active_ehi;
1554 bool fbs_need_dec = false;
1555 u32 serror;
1556
1557 /* determine active link with error */
1558 if (pp->fbs_enabled) {
1559 void __iomem *port_mmio = ahci_port_base(ap);
1560 u32 fbs = readl(port_mmio + PORT_FBS);
1561 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1562
1563 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1564 ata_link_online(&ap->pmp_link[pmp])) {
1565 link = &ap->pmp_link[pmp];
1566 fbs_need_dec = true;
1567 }
1568
1569 } else
1570 ata_for_each_link(link, ap, EDGE)
1571 if (ata_link_active(link))
1572 break;
1573
1574 if (!link)
1575 link = &ap->link;
1576
1577 active_qc = ata_qc_from_tag(ap, link->active_tag);
1578 active_ehi = &link->eh_info;
1579
1580 /* record irq stat */
1581 ata_ehi_clear_desc(host_ehi);
1582 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1583
1584 /* AHCI needs SError cleared; otherwise, it might lock up */
1585 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1586 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1587 host_ehi->serror |= serror;
1588
1589 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1590 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1591 irq_stat &= ~PORT_IRQ_IF_ERR;
1592
1593 if (irq_stat & PORT_IRQ_TF_ERR) {
1594 /* If qc is active, charge it; otherwise, the active
1595 * link. There's no active qc on NCQ errors. It will
1596 * be determined by EH by reading log page 10h.
1597 */
1598 if (active_qc)
1599 active_qc->err_mask |= AC_ERR_DEV;
1600 else
1601 active_ehi->err_mask |= AC_ERR_DEV;
1602
1603 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1604 host_ehi->serror &= ~SERR_INTERNAL;
1605 }
1606
1607 if (irq_stat & PORT_IRQ_UNK_FIS) {
1608 u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1609
1610 active_ehi->err_mask |= AC_ERR_HSM;
1611 active_ehi->action |= ATA_EH_RESET;
1612 ata_ehi_push_desc(active_ehi,
1613 "unknown FIS %08x %08x %08x %08x" ,
1614 unk[0], unk[1], unk[2], unk[3]);
1615 }
1616
1617 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1618 active_ehi->err_mask |= AC_ERR_HSM;
1619 active_ehi->action |= ATA_EH_RESET;
1620 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1621 }
1622
1623 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1624 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1625 host_ehi->action |= ATA_EH_RESET;
1626 ata_ehi_push_desc(host_ehi, "host bus error");
1627 }
1628
1629 if (irq_stat & PORT_IRQ_IF_ERR) {
1630 if (fbs_need_dec)
1631 active_ehi->err_mask |= AC_ERR_DEV;
1632 else {
1633 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1634 host_ehi->action |= ATA_EH_RESET;
1635 }
1636
1637 ata_ehi_push_desc(host_ehi, "interface fatal error");
1638 }
1639
1640 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1641 ata_ehi_hotplugged(host_ehi);
1642 ata_ehi_push_desc(host_ehi, "%s",
1643 irq_stat & PORT_IRQ_CONNECT ?
1644 "connection status changed" : "PHY RDY changed");
1645 }
1646
1647 /* okay, let's hand over to EH */
1648
1649 if (irq_stat & PORT_IRQ_FREEZE)
1650 ata_port_freeze(ap);
1651 else if (fbs_need_dec) {
1652 ata_link_abort(link);
1653 ahci_fbs_dec_intr(ap);
1654 } else
1655 ata_port_abort(ap);
1656 }
1657
1658 static void ahci_handle_port_interrupt(struct ata_port *ap,
1659 void __iomem *port_mmio, u32 status)
1660 {
1661 struct ata_eh_info *ehi = &ap->link.eh_info;
1662 struct ahci_port_priv *pp = ap->private_data;
1663 struct ahci_host_priv *hpriv = ap->host->private_data;
1664 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1665 u32 qc_active = 0;
1666 int rc;
1667
1668 /* ignore BAD_PMP while resetting */
1669 if (unlikely(resetting))
1670 status &= ~PORT_IRQ_BAD_PMP;
1671
1672 /* if LPM is enabled, PHYRDY doesn't mean anything */
1673 if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
1674 status &= ~PORT_IRQ_PHYRDY;
1675 ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1676 }
1677
1678 if (unlikely(status & PORT_IRQ_ERROR)) {
1679 ahci_error_intr(ap, status);
1680 return;
1681 }
1682
1683 if (status & PORT_IRQ_SDB_FIS) {
1684 /* If SNotification is available, leave notification
1685 * handling to sata_async_notification(). If not,
1686 * emulate it by snooping SDB FIS RX area.
1687 *
1688 * Snooping FIS RX area is probably cheaper than
1689 * poking SNotification but some constrollers which
1690 * implement SNotification, ICH9 for example, don't
1691 * store AN SDB FIS into receive area.
1692 */
1693 if (hpriv->cap & HOST_CAP_SNTF)
1694 sata_async_notification(ap);
1695 else {
1696 /* If the 'N' bit in word 0 of the FIS is set,
1697 * we just received asynchronous notification.
1698 * Tell libata about it.
1699 *
1700 * Lack of SNotification should not appear in
1701 * ahci 1.2, so the workaround is unnecessary
1702 * when FBS is enabled.
1703 */
1704 if (pp->fbs_enabled)
1705 WARN_ON_ONCE(1);
1706 else {
1707 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1708 u32 f0 = le32_to_cpu(f[0]);
1709 if (f0 & (1 << 15))
1710 sata_async_notification(ap);
1711 }
1712 }
1713 }
1714
1715 /* pp->active_link is not reliable once FBS is enabled, both
1716 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1717 * NCQ and non-NCQ commands may be in flight at the same time.
1718 */
1719 if (pp->fbs_enabled) {
1720 if (ap->qc_active) {
1721 qc_active = readl(port_mmio + PORT_SCR_ACT);
1722 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1723 }
1724 } else {
1725 /* pp->active_link is valid iff any command is in flight */
1726 if (ap->qc_active && pp->active_link->sactive)
1727 qc_active = readl(port_mmio + PORT_SCR_ACT);
1728 else
1729 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1730 }
1731
1732
1733 rc = ata_qc_complete_multiple(ap, qc_active);
1734
1735 /* while resetting, invalid completions are expected */
1736 if (unlikely(rc < 0 && !resetting)) {
1737 ehi->err_mask |= AC_ERR_HSM;
1738 ehi->action |= ATA_EH_RESET;
1739 ata_port_freeze(ap);
1740 }
1741 }
1742
1743 void ahci_port_intr(struct ata_port *ap)
1744 {
1745 void __iomem *port_mmio = ahci_port_base(ap);
1746 u32 status;
1747
1748 status = readl(port_mmio + PORT_IRQ_STAT);
1749 writel(status, port_mmio + PORT_IRQ_STAT);
1750
1751 ahci_handle_port_interrupt(ap, port_mmio, status);
1752 }
1753
1754 irqreturn_t ahci_thread_fn(int irq, void *dev_instance)
1755 {
1756 struct ata_port *ap = dev_instance;
1757 struct ahci_port_priv *pp = ap->private_data;
1758 void __iomem *port_mmio = ahci_port_base(ap);
1759 unsigned long flags;
1760 u32 status;
1761
1762 spin_lock_irqsave(&ap->host->lock, flags);
1763 status = pp->intr_status;
1764 if (status)
1765 pp->intr_status = 0;
1766 spin_unlock_irqrestore(&ap->host->lock, flags);
1767
1768 spin_lock_bh(ap->lock);
1769 ahci_handle_port_interrupt(ap, port_mmio, status);
1770 spin_unlock_bh(ap->lock);
1771
1772 return IRQ_HANDLED;
1773 }
1774 EXPORT_SYMBOL_GPL(ahci_thread_fn);
1775
1776 void ahci_hw_port_interrupt(struct ata_port *ap)
1777 {
1778 void __iomem *port_mmio = ahci_port_base(ap);
1779 struct ahci_port_priv *pp = ap->private_data;
1780 u32 status;
1781
1782 status = readl(port_mmio + PORT_IRQ_STAT);
1783 writel(status, port_mmio + PORT_IRQ_STAT);
1784
1785 pp->intr_status |= status;
1786 }
1787
1788 irqreturn_t ahci_hw_interrupt(int irq, void *dev_instance)
1789 {
1790 struct ata_port *ap_this = dev_instance;
1791 struct ahci_port_priv *pp = ap_this->private_data;
1792 struct ata_host *host = ap_this->host;
1793 struct ahci_host_priv *hpriv = host->private_data;
1794 void __iomem *mmio = hpriv->mmio;
1795 unsigned int i;
1796 u32 irq_stat, irq_masked;
1797
1798 VPRINTK("ENTER\n");
1799
1800 spin_lock(&host->lock);
1801
1802 irq_stat = readl(mmio + HOST_IRQ_STAT);
1803
1804 if (!irq_stat) {
1805 u32 status = pp->intr_status;
1806
1807 spin_unlock(&host->lock);
1808
1809 VPRINTK("EXIT\n");
1810
1811 return status ? IRQ_WAKE_THREAD : IRQ_NONE;
1812 }
1813
1814 irq_masked = irq_stat & hpriv->port_map;
1815
1816 for (i = 0; i < host->n_ports; i++) {
1817 struct ata_port *ap;
1818
1819 if (!(irq_masked & (1 << i)))
1820 continue;
1821
1822 ap = host->ports[i];
1823 if (ap) {
1824 ahci_hw_port_interrupt(ap);
1825 VPRINTK("port %u\n", i);
1826 } else {
1827 VPRINTK("port %u (no irq)\n", i);
1828 if (ata_ratelimit())
1829 dev_warn(host->dev,
1830 "interrupt on disabled port %u\n", i);
1831 }
1832 }
1833
1834 writel(irq_stat, mmio + HOST_IRQ_STAT);
1835
1836 spin_unlock(&host->lock);
1837
1838 VPRINTK("EXIT\n");
1839
1840 return IRQ_WAKE_THREAD;
1841 }
1842 EXPORT_SYMBOL_GPL(ahci_hw_interrupt);
1843
1844 irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1845 {
1846 struct ata_host *host = dev_instance;
1847 struct ahci_host_priv *hpriv;
1848 unsigned int i, handled = 0;
1849 void __iomem *mmio;
1850 u32 irq_stat, irq_masked;
1851
1852 VPRINTK("ENTER\n");
1853
1854 hpriv = host->private_data;
1855 mmio = hpriv->mmio;
1856
1857 /* sigh. 0xffffffff is a valid return from h/w */
1858 irq_stat = readl(mmio + HOST_IRQ_STAT);
1859 if (!irq_stat)
1860 return IRQ_NONE;
1861
1862 irq_masked = irq_stat & hpriv->port_map;
1863
1864 spin_lock(&host->lock);
1865
1866 for (i = 0; i < host->n_ports; i++) {
1867 struct ata_port *ap;
1868
1869 if (!(irq_masked & (1 << i)))
1870 continue;
1871
1872 ap = host->ports[i];
1873 if (ap) {
1874 ahci_port_intr(ap);
1875 VPRINTK("port %u\n", i);
1876 } else {
1877 VPRINTK("port %u (no irq)\n", i);
1878 if (ata_ratelimit())
1879 dev_warn(host->dev,
1880 "interrupt on disabled port %u\n", i);
1881 }
1882
1883 handled = 1;
1884 }
1885
1886 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1887 * it should be cleared after all the port events are cleared;
1888 * otherwise, it will raise a spurious interrupt after each
1889 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1890 * information.
1891 *
1892 * Also, use the unmasked value to clear interrupt as spurious
1893 * pending event on a dummy port might cause screaming IRQ.
1894 */
1895 writel(irq_stat, mmio + HOST_IRQ_STAT);
1896
1897 spin_unlock(&host->lock);
1898
1899 VPRINTK("EXIT\n");
1900
1901 return IRQ_RETVAL(handled);
1902 }
1903 EXPORT_SYMBOL_GPL(ahci_interrupt);
1904
1905 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1906 {
1907 struct ata_port *ap = qc->ap;
1908 void __iomem *port_mmio = ahci_port_base(ap);
1909 struct ahci_port_priv *pp = ap->private_data;
1910
1911 /* Keep track of the currently active link. It will be used
1912 * in completion path to determine whether NCQ phase is in
1913 * progress.
1914 */
1915 pp->active_link = qc->dev->link;
1916
1917 if (qc->tf.protocol == ATA_PROT_NCQ)
1918 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1919
1920 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1921 u32 fbs = readl(port_mmio + PORT_FBS);
1922 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1923 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1924 writel(fbs, port_mmio + PORT_FBS);
1925 pp->fbs_last_dev = qc->dev->link->pmp;
1926 }
1927
1928 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1929
1930 ahci_sw_activity(qc->dev->link);
1931
1932 return 0;
1933 }
1934
1935 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1936 {
1937 struct ahci_port_priv *pp = qc->ap->private_data;
1938 u8 *rx_fis = pp->rx_fis;
1939
1940 if (pp->fbs_enabled)
1941 rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1942
1943 /*
1944 * After a successful execution of an ATA PIO data-in command,
1945 * the device doesn't send D2H Reg FIS to update the TF and
1946 * the host should take TF and E_Status from the preceding PIO
1947 * Setup FIS.
1948 */
1949 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1950 !(qc->flags & ATA_QCFLAG_FAILED)) {
1951 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1952 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1953 } else
1954 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1955
1956 return true;
1957 }
1958
1959 static void ahci_freeze(struct ata_port *ap)
1960 {
1961 void __iomem *port_mmio = ahci_port_base(ap);
1962
1963 /* turn IRQ off */
1964 writel(0, port_mmio + PORT_IRQ_MASK);
1965 }
1966
1967 static void ahci_thaw(struct ata_port *ap)
1968 {
1969 struct ahci_host_priv *hpriv = ap->host->private_data;
1970 void __iomem *mmio = hpriv->mmio;
1971 void __iomem *port_mmio = ahci_port_base(ap);
1972 u32 tmp;
1973 struct ahci_port_priv *pp = ap->private_data;
1974
1975 /* clear IRQ */
1976 tmp = readl(port_mmio + PORT_IRQ_STAT);
1977 writel(tmp, port_mmio + PORT_IRQ_STAT);
1978 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1979
1980 /* turn IRQ back on */
1981 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1982 }
1983
1984 static void ahci_error_handler(struct ata_port *ap)
1985 {
1986 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1987 /* restart engine */
1988 ahci_stop_engine(ap);
1989 ahci_start_engine(ap);
1990 }
1991
1992 sata_pmp_error_handler(ap);
1993
1994 if (!ata_dev_enabled(ap->link.device))
1995 ahci_stop_engine(ap);
1996 }
1997
1998 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1999 {
2000 struct ata_port *ap = qc->ap;
2001
2002 /* make DMA engine forget about the failed command */
2003 if (qc->flags & ATA_QCFLAG_FAILED)
2004 ahci_kick_engine(ap);
2005 }
2006
2007 static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2008 {
2009 void __iomem *port_mmio = ahci_port_base(ap);
2010 struct ata_device *dev = ap->link.device;
2011 u32 devslp, dm, dito, mdat, deto;
2012 int rc;
2013 unsigned int err_mask;
2014
2015 devslp = readl(port_mmio + PORT_DEVSLP);
2016 if (!(devslp & PORT_DEVSLP_DSP)) {
2017 dev_err(ap->host->dev, "port does not support device sleep\n");
2018 return;
2019 }
2020
2021 /* disable device sleep */
2022 if (!sleep) {
2023 if (devslp & PORT_DEVSLP_ADSE) {
2024 writel(devslp & ~PORT_DEVSLP_ADSE,
2025 port_mmio + PORT_DEVSLP);
2026 err_mask = ata_dev_set_feature(dev,
2027 SETFEATURES_SATA_DISABLE,
2028 SATA_DEVSLP);
2029 if (err_mask && err_mask != AC_ERR_DEV)
2030 ata_dev_warn(dev, "failed to disable DEVSLP\n");
2031 }
2032 return;
2033 }
2034
2035 /* device sleep was already enabled */
2036 if (devslp & PORT_DEVSLP_ADSE)
2037 return;
2038
2039 /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2040 rc = ahci_stop_engine(ap);
2041 if (rc)
2042 return;
2043
2044 dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2045 dito = devslp_idle_timeout / (dm + 1);
2046 if (dito > 0x3ff)
2047 dito = 0x3ff;
2048
2049 /* Use the nominal value 10 ms if the read MDAT is zero,
2050 * the nominal value of DETO is 20 ms.
2051 */
2052 if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2053 ATA_LOG_DEVSLP_VALID_MASK) {
2054 mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2055 ATA_LOG_DEVSLP_MDAT_MASK;
2056 if (!mdat)
2057 mdat = 10;
2058 deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2059 if (!deto)
2060 deto = 20;
2061 } else {
2062 mdat = 10;
2063 deto = 20;
2064 }
2065
2066 devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2067 (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2068 (deto << PORT_DEVSLP_DETO_OFFSET) |
2069 PORT_DEVSLP_ADSE);
2070 writel(devslp, port_mmio + PORT_DEVSLP);
2071
2072 ahci_start_engine(ap);
2073
2074 /* enable device sleep feature for the drive */
2075 err_mask = ata_dev_set_feature(dev,
2076 SETFEATURES_SATA_ENABLE,
2077 SATA_DEVSLP);
2078 if (err_mask && err_mask != AC_ERR_DEV)
2079 ata_dev_warn(dev, "failed to enable DEVSLP\n");
2080 }
2081
2082 static void ahci_enable_fbs(struct ata_port *ap)
2083 {
2084 struct ahci_port_priv *pp = ap->private_data;
2085 void __iomem *port_mmio = ahci_port_base(ap);
2086 u32 fbs;
2087 int rc;
2088
2089 if (!pp->fbs_supported)
2090 return;
2091
2092 fbs = readl(port_mmio + PORT_FBS);
2093 if (fbs & PORT_FBS_EN) {
2094 pp->fbs_enabled = true;
2095 pp->fbs_last_dev = -1; /* initialization */
2096 return;
2097 }
2098
2099 rc = ahci_stop_engine(ap);
2100 if (rc)
2101 return;
2102
2103 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2104 fbs = readl(port_mmio + PORT_FBS);
2105 if (fbs & PORT_FBS_EN) {
2106 dev_info(ap->host->dev, "FBS is enabled\n");
2107 pp->fbs_enabled = true;
2108 pp->fbs_last_dev = -1; /* initialization */
2109 } else
2110 dev_err(ap->host->dev, "Failed to enable FBS\n");
2111
2112 ahci_start_engine(ap);
2113 }
2114
2115 static void ahci_disable_fbs(struct ata_port *ap)
2116 {
2117 struct ahci_port_priv *pp = ap->private_data;
2118 void __iomem *port_mmio = ahci_port_base(ap);
2119 u32 fbs;
2120 int rc;
2121
2122 if (!pp->fbs_supported)
2123 return;
2124
2125 fbs = readl(port_mmio + PORT_FBS);
2126 if ((fbs & PORT_FBS_EN) == 0) {
2127 pp->fbs_enabled = false;
2128 return;
2129 }
2130
2131 rc = ahci_stop_engine(ap);
2132 if (rc)
2133 return;
2134
2135 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2136 fbs = readl(port_mmio + PORT_FBS);
2137 if (fbs & PORT_FBS_EN)
2138 dev_err(ap->host->dev, "Failed to disable FBS\n");
2139 else {
2140 dev_info(ap->host->dev, "FBS is disabled\n");
2141 pp->fbs_enabled = false;
2142 }
2143
2144 ahci_start_engine(ap);
2145 }
2146
2147 static void ahci_pmp_attach(struct ata_port *ap)
2148 {
2149 void __iomem *port_mmio = ahci_port_base(ap);
2150 struct ahci_port_priv *pp = ap->private_data;
2151 u32 cmd;
2152
2153 cmd = readl(port_mmio + PORT_CMD);
2154 cmd |= PORT_CMD_PMP;
2155 writel(cmd, port_mmio + PORT_CMD);
2156
2157 ahci_enable_fbs(ap);
2158
2159 pp->intr_mask |= PORT_IRQ_BAD_PMP;
2160
2161 /*
2162 * We must not change the port interrupt mask register if the
2163 * port is marked frozen, the value in pp->intr_mask will be
2164 * restored later when the port is thawed.
2165 *
2166 * Note that during initialization, the port is marked as
2167 * frozen since the irq handler is not yet registered.
2168 */
2169 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2170 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2171 }
2172
2173 static void ahci_pmp_detach(struct ata_port *ap)
2174 {
2175 void __iomem *port_mmio = ahci_port_base(ap);
2176 struct ahci_port_priv *pp = ap->private_data;
2177 u32 cmd;
2178
2179 ahci_disable_fbs(ap);
2180
2181 cmd = readl(port_mmio + PORT_CMD);
2182 cmd &= ~PORT_CMD_PMP;
2183 writel(cmd, port_mmio + PORT_CMD);
2184
2185 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2186
2187 /* see comment above in ahci_pmp_attach() */
2188 if (!(ap->pflags & ATA_PFLAG_FROZEN))
2189 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2190 }
2191
2192 int ahci_port_resume(struct ata_port *ap)
2193 {
2194 ahci_power_up(ap);
2195 ahci_start_port(ap);
2196
2197 if (sata_pmp_attached(ap))
2198 ahci_pmp_attach(ap);
2199 else
2200 ahci_pmp_detach(ap);
2201
2202 return 0;
2203 }
2204 EXPORT_SYMBOL_GPL(ahci_port_resume);
2205
2206 #ifdef CONFIG_PM
2207 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2208 {
2209 const char *emsg = NULL;
2210 int rc;
2211
2212 rc = ahci_deinit_port(ap, &emsg);
2213 if (rc == 0)
2214 ahci_power_down(ap);
2215 else {
2216 ata_port_err(ap, "%s (%d)\n", emsg, rc);
2217 ata_port_freeze(ap);
2218 }
2219
2220 return rc;
2221 }
2222 #endif
2223
2224 static int ahci_port_start(struct ata_port *ap)
2225 {
2226 struct ahci_host_priv *hpriv = ap->host->private_data;
2227 struct device *dev = ap->host->dev;
2228 struct ahci_port_priv *pp;
2229 void *mem;
2230 dma_addr_t mem_dma;
2231 size_t dma_sz, rx_fis_sz;
2232
2233 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2234 if (!pp)
2235 return -ENOMEM;
2236
2237 /* check FBS capability */
2238 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2239 void __iomem *port_mmio = ahci_port_base(ap);
2240 u32 cmd = readl(port_mmio + PORT_CMD);
2241 if (cmd & PORT_CMD_FBSCP)
2242 pp->fbs_supported = true;
2243 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2244 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2245 ap->port_no);
2246 pp->fbs_supported = true;
2247 } else
2248 dev_warn(dev, "port %d is not capable of FBS\n",
2249 ap->port_no);
2250 }
2251
2252 if (pp->fbs_supported) {
2253 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2254 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2255 } else {
2256 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2257 rx_fis_sz = AHCI_RX_FIS_SZ;
2258 }
2259
2260 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2261 if (!mem)
2262 return -ENOMEM;
2263 memset(mem, 0, dma_sz);
2264
2265 /*
2266 * First item in chunk of DMA memory: 32-slot command table,
2267 * 32 bytes each in size
2268 */
2269 pp->cmd_slot = mem;
2270 pp->cmd_slot_dma = mem_dma;
2271
2272 mem += AHCI_CMD_SLOT_SZ;
2273 mem_dma += AHCI_CMD_SLOT_SZ;
2274
2275 /*
2276 * Second item: Received-FIS area
2277 */
2278 pp->rx_fis = mem;
2279 pp->rx_fis_dma = mem_dma;
2280
2281 mem += rx_fis_sz;
2282 mem_dma += rx_fis_sz;
2283
2284 /*
2285 * Third item: data area for storing a single command
2286 * and its scatter-gather table
2287 */
2288 pp->cmd_tbl = mem;
2289 pp->cmd_tbl_dma = mem_dma;
2290
2291 /*
2292 * Save off initial list of interrupts to be enabled.
2293 * This could be changed later
2294 */
2295 pp->intr_mask = DEF_PORT_IRQ;
2296
2297 /*
2298 * Switch to per-port locking in case each port has its own MSI vector.
2299 */
2300 if ((hpriv->flags & AHCI_HFLAG_MULTI_MSI)) {
2301 spin_lock_init(&pp->lock);
2302 ap->lock = &pp->lock;
2303 }
2304
2305 ap->private_data = pp;
2306
2307 /* engage engines, captain */
2308 return ahci_port_resume(ap);
2309 }
2310
2311 static void ahci_port_stop(struct ata_port *ap)
2312 {
2313 const char *emsg = NULL;
2314 int rc;
2315
2316 /* de-initialize port */
2317 rc = ahci_deinit_port(ap, &emsg);
2318 if (rc)
2319 ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2320 }
2321
2322 void ahci_print_info(struct ata_host *host, const char *scc_s)
2323 {
2324 struct ahci_host_priv *hpriv = host->private_data;
2325 void __iomem *mmio = hpriv->mmio;
2326 u32 vers, cap, cap2, impl, speed;
2327 const char *speed_s;
2328
2329 vers = readl(mmio + HOST_VERSION);
2330 cap = hpriv->cap;
2331 cap2 = hpriv->cap2;
2332 impl = hpriv->port_map;
2333
2334 speed = (cap >> 20) & 0xf;
2335 if (speed == 1)
2336 speed_s = "1.5";
2337 else if (speed == 2)
2338 speed_s = "3";
2339 else if (speed == 3)
2340 speed_s = "6";
2341 else
2342 speed_s = "?";
2343
2344 dev_info(host->dev,
2345 "AHCI %02x%02x.%02x%02x "
2346 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2347 ,
2348
2349 (vers >> 24) & 0xff,
2350 (vers >> 16) & 0xff,
2351 (vers >> 8) & 0xff,
2352 vers & 0xff,
2353
2354 ((cap >> 8) & 0x1f) + 1,
2355 (cap & 0x1f) + 1,
2356 speed_s,
2357 impl,
2358 scc_s);
2359
2360 dev_info(host->dev,
2361 "flags: "
2362 "%s%s%s%s%s%s%s"
2363 "%s%s%s%s%s%s%s"
2364 "%s%s%s%s%s%s%s"
2365 "%s%s\n"
2366 ,
2367
2368 cap & HOST_CAP_64 ? "64bit " : "",
2369 cap & HOST_CAP_NCQ ? "ncq " : "",
2370 cap & HOST_CAP_SNTF ? "sntf " : "",
2371 cap & HOST_CAP_MPS ? "ilck " : "",
2372 cap & HOST_CAP_SSS ? "stag " : "",
2373 cap & HOST_CAP_ALPM ? "pm " : "",
2374 cap & HOST_CAP_LED ? "led " : "",
2375 cap & HOST_CAP_CLO ? "clo " : "",
2376 cap & HOST_CAP_ONLY ? "only " : "",
2377 cap & HOST_CAP_PMP ? "pmp " : "",
2378 cap & HOST_CAP_FBS ? "fbs " : "",
2379 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2380 cap & HOST_CAP_SSC ? "slum " : "",
2381 cap & HOST_CAP_PART ? "part " : "",
2382 cap & HOST_CAP_CCC ? "ccc " : "",
2383 cap & HOST_CAP_EMS ? "ems " : "",
2384 cap & HOST_CAP_SXS ? "sxs " : "",
2385 cap2 & HOST_CAP2_DESO ? "deso " : "",
2386 cap2 & HOST_CAP2_SADM ? "sadm " : "",
2387 cap2 & HOST_CAP2_SDS ? "sds " : "",
2388 cap2 & HOST_CAP2_APST ? "apst " : "",
2389 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2390 cap2 & HOST_CAP2_BOH ? "boh " : ""
2391 );
2392 }
2393 EXPORT_SYMBOL_GPL(ahci_print_info);
2394
2395 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2396 struct ata_port_info *pi)
2397 {
2398 u8 messages;
2399 void __iomem *mmio = hpriv->mmio;
2400 u32 em_loc = readl(mmio + HOST_EM_LOC);
2401 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2402
2403 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2404 return;
2405
2406 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2407
2408 if (messages) {
2409 /* store em_loc */
2410 hpriv->em_loc = ((em_loc >> 16) * 4);
2411 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2412 hpriv->em_msg_type = messages;
2413 pi->flags |= ATA_FLAG_EM;
2414 if (!(em_ctl & EM_CTL_ALHD))
2415 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2416 }
2417 }
2418 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2419
2420 MODULE_AUTHOR("Jeff Garzik");
2421 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2422 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)