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Linux 2.6.35-rc4
[linux-2.6/next.git] / drivers / ata / libahci.c
blob81e772a94d59857187fda27dbfe7702469fb590f
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
49 static int ahci_skip_host_reset;
50 int ahci_ignore_sss;
51 EXPORT_SYMBOL_GPL(ahci_ignore_sss);
52
53 module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
54 MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
55
56 module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
57 MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
58
59 static int ahci_enable_alpm(struct ata_port *ap,
60 enum link_pm policy);
61 static void ahci_disable_alpm(struct ata_port *ap);
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_enable_fbs(struct ata_port *ap);
81 static void ahci_disable_fbs(struct ata_port *ap);
82 static void ahci_pmp_attach(struct ata_port *ap);
83 static void ahci_pmp_detach(struct ata_port *ap);
84 static int ahci_softreset(struct ata_link *link, unsigned int *class,
85 unsigned long deadline);
86 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
87 unsigned long deadline);
88 static void ahci_postreset(struct ata_link *link, unsigned int *class);
89 static void ahci_error_handler(struct ata_port *ap);
90 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
91 static int ahci_port_resume(struct ata_port *ap);
92 static void ahci_dev_config(struct ata_device *dev);
93 static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
94 u32 opts);
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
117 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
118 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
119 static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
120 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
121 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
122 ahci_read_em_buffer, ahci_store_em_buffer);
123
124 static struct device_attribute *ahci_shost_attrs[] = {
125 &dev_attr_link_power_management_policy,
126 &dev_attr_em_message_type,
127 &dev_attr_em_message,
128 &dev_attr_ahci_host_caps,
129 &dev_attr_ahci_host_cap2,
130 &dev_attr_ahci_host_version,
131 &dev_attr_ahci_port_cmd,
132 &dev_attr_em_buffer,
133 NULL
134 };
135
136 static struct device_attribute *ahci_sdev_attrs[] = {
137 &dev_attr_sw_activity,
138 &dev_attr_unload_heads,
139 NULL
140 };
141
142 struct scsi_host_template ahci_sht = {
143 ATA_NCQ_SHT("ahci"),
144 .can_queue = AHCI_MAX_CMDS - 1,
145 .sg_tablesize = AHCI_MAX_SG,
146 .dma_boundary = AHCI_DMA_BOUNDARY,
147 .shost_attrs = ahci_shost_attrs,
148 .sdev_attrs = ahci_sdev_attrs,
149 };
150 EXPORT_SYMBOL_GPL(ahci_sht);
151
152 struct ata_port_operations ahci_ops = {
153 .inherits = &sata_pmp_port_ops,
154
155 .qc_defer = ahci_pmp_qc_defer,
156 .qc_prep = ahci_qc_prep,
157 .qc_issue = ahci_qc_issue,
158 .qc_fill_rtf = ahci_qc_fill_rtf,
159
160 .freeze = ahci_freeze,
161 .thaw = ahci_thaw,
162 .softreset = ahci_softreset,
163 .hardreset = ahci_hardreset,
164 .postreset = ahci_postreset,
165 .pmp_softreset = ahci_softreset,
166 .error_handler = ahci_error_handler,
167 .post_internal_cmd = ahci_post_internal_cmd,
168 .dev_config = ahci_dev_config,
169
170 .scr_read = ahci_scr_read,
171 .scr_write = ahci_scr_write,
172 .pmp_attach = ahci_pmp_attach,
173 .pmp_detach = ahci_pmp_detach,
174
175 .enable_pm = ahci_enable_alpm,
176 .disable_pm = ahci_disable_alpm,
177 .em_show = ahci_led_show,
178 .em_store = ahci_led_store,
179 .sw_activity_show = ahci_activity_show,
180 .sw_activity_store = ahci_activity_store,
181 #ifdef CONFIG_PM
182 .port_suspend = ahci_port_suspend,
183 .port_resume = ahci_port_resume,
184 #endif
185 .port_start = ahci_port_start,
186 .port_stop = ahci_port_stop,
187 };
188 EXPORT_SYMBOL_GPL(ahci_ops);
189
190 int ahci_em_messages = 1;
191 EXPORT_SYMBOL_GPL(ahci_em_messages);
192 module_param(ahci_em_messages, int, 0444);
193 /* add other LED protocol types when they become supported */
194 MODULE_PARM_DESC(ahci_em_messages,
195 "AHCI Enclosure Management Message control (0 = off, 1 = on)");
196
197 static void ahci_enable_ahci(void __iomem *mmio)
198 {
199 int i;
200 u32 tmp;
201
202 /* turn on AHCI_EN */
203 tmp = readl(mmio + HOST_CTL);
204 if (tmp & HOST_AHCI_EN)
205 return;
206
207 /* Some controllers need AHCI_EN to be written multiple times.
208 * Try a few times before giving up.
209 */
210 for (i = 0; i < 5; i++) {
211 tmp |= HOST_AHCI_EN;
212 writel(tmp, mmio + HOST_CTL);
213 tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
214 if (tmp & HOST_AHCI_EN)
215 return;
216 msleep(10);
217 }
218
219 WARN_ON(1);
220 }
221
222 static ssize_t ahci_show_host_caps(struct device *dev,
223 struct device_attribute *attr, char *buf)
224 {
225 struct Scsi_Host *shost = class_to_shost(dev);
226 struct ata_port *ap = ata_shost_to_port(shost);
227 struct ahci_host_priv *hpriv = ap->host->private_data;
228
229 return sprintf(buf, "%x\n", hpriv->cap);
230 }
231
232 static ssize_t ahci_show_host_cap2(struct device *dev,
233 struct device_attribute *attr, char *buf)
234 {
235 struct Scsi_Host *shost = class_to_shost(dev);
236 struct ata_port *ap = ata_shost_to_port(shost);
237 struct ahci_host_priv *hpriv = ap->host->private_data;
238
239 return sprintf(buf, "%x\n", hpriv->cap2);
240 }
241
242 static ssize_t ahci_show_host_version(struct device *dev,
243 struct device_attribute *attr, char *buf)
244 {
245 struct Scsi_Host *shost = class_to_shost(dev);
246 struct ata_port *ap = ata_shost_to_port(shost);
247 struct ahci_host_priv *hpriv = ap->host->private_data;
248 void __iomem *mmio = hpriv->mmio;
249
250 return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
251 }
252
253 static ssize_t ahci_show_port_cmd(struct device *dev,
254 struct device_attribute *attr, char *buf)
255 {
256 struct Scsi_Host *shost = class_to_shost(dev);
257 struct ata_port *ap = ata_shost_to_port(shost);
258 void __iomem *port_mmio = ahci_port_base(ap);
259
260 return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
261 }
262
263 static ssize_t ahci_read_em_buffer(struct device *dev,
264 struct device_attribute *attr, char *buf)
265 {
266 struct Scsi_Host *shost = class_to_shost(dev);
267 struct ata_port *ap = ata_shost_to_port(shost);
268 struct ahci_host_priv *hpriv = ap->host->private_data;
269 void __iomem *mmio = hpriv->mmio;
270 void __iomem *em_mmio = mmio + hpriv->em_loc;
271 u32 em_ctl, msg;
272 unsigned long flags;
273 size_t count;
274 int i;
275
276 spin_lock_irqsave(ap->lock, flags);
277
278 em_ctl = readl(mmio + HOST_EM_CTL);
279 if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
280 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
281 spin_unlock_irqrestore(ap->lock, flags);
282 return -EINVAL;
283 }
284
285 if (!(em_ctl & EM_CTL_MR)) {
286 spin_unlock_irqrestore(ap->lock, flags);
287 return -EAGAIN;
288 }
289
290 if (!(em_ctl & EM_CTL_SMB))
291 em_mmio += hpriv->em_buf_sz;
292
293 count = hpriv->em_buf_sz;
294
295 /* the count should not be larger than PAGE_SIZE */
296 if (count > PAGE_SIZE) {
297 if (printk_ratelimit())
298 ata_port_printk(ap, KERN_WARNING,
299 "EM read buffer size too large: "
300 "buffer size %u, page size %lu\n",
301 hpriv->em_buf_sz, PAGE_SIZE);
302 count = PAGE_SIZE;
303 }
304
305 for (i = 0; i < count; i += 4) {
306 msg = readl(em_mmio + i);
307 buf[i] = msg & 0xff;
308 buf[i + 1] = (msg >> 8) & 0xff;
309 buf[i + 2] = (msg >> 16) & 0xff;
310 buf[i + 3] = (msg >> 24) & 0xff;
311 }
312
313 spin_unlock_irqrestore(ap->lock, flags);
314
315 return i;
316 }
317
318 static ssize_t ahci_store_em_buffer(struct device *dev,
319 struct device_attribute *attr,
320 const char *buf, size_t size)
321 {
322 struct Scsi_Host *shost = class_to_shost(dev);
323 struct ata_port *ap = ata_shost_to_port(shost);
324 struct ahci_host_priv *hpriv = ap->host->private_data;
325 void __iomem *mmio = hpriv->mmio;
326 void __iomem *em_mmio = mmio + hpriv->em_loc;
327 const unsigned char *msg_buf = buf;
328 u32 em_ctl, msg;
329 unsigned long flags;
330 int i;
331
332 /* check size validity */
333 if (!(ap->flags & ATA_FLAG_EM) ||
334 !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
335 size % 4 || size > hpriv->em_buf_sz)
336 return -EINVAL;
337
338 spin_lock_irqsave(ap->lock, flags);
339
340 em_ctl = readl(mmio + HOST_EM_CTL);
341 if (em_ctl & EM_CTL_TM) {
342 spin_unlock_irqrestore(ap->lock, flags);
343 return -EBUSY;
344 }
345
346 for (i = 0; i < size; i += 4) {
347 msg = msg_buf[i] | msg_buf[i + 1] << 8 |
348 msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
349 writel(msg, em_mmio + i);
350 }
351
352 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
353
354 spin_unlock_irqrestore(ap->lock, flags);
355
356 return size;
357 }
358
359 /**
360 * ahci_save_initial_config - Save and fixup initial config values
361 * @dev: target AHCI device
362 * @hpriv: host private area to store config values
363 * @force_port_map: force port map to a specified value
364 * @mask_port_map: mask out particular bits from port map
365 *
366 * Some registers containing configuration info might be setup by
367 * BIOS and might be cleared on reset. This function saves the
368 * initial values of those registers into @hpriv such that they
369 * can be restored after controller reset.
370 *
371 * If inconsistent, config values are fixed up by this function.
372 *
373 * LOCKING:
374 * None.
375 */
376 void ahci_save_initial_config(struct device *dev,
377 struct ahci_host_priv *hpriv,
378 unsigned int force_port_map,
379 unsigned int mask_port_map)
380 {
381 void __iomem *mmio = hpriv->mmio;
382 u32 cap, cap2, vers, port_map;
383 int i;
384
385 /* make sure AHCI mode is enabled before accessing CAP */
386 ahci_enable_ahci(mmio);
387
388 /* Values prefixed with saved_ are written back to host after
389 * reset. Values without are used for driver operation.
390 */
391 hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
392 hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
393
394 /* CAP2 register is only defined for AHCI 1.2 and later */
395 vers = readl(mmio + HOST_VERSION);
396 if ((vers >> 16) > 1 ||
397 ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
398 hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
399 else
400 hpriv->saved_cap2 = cap2 = 0;
401
402 /* some chips have errata preventing 64bit use */
403 if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
404 dev_printk(KERN_INFO, dev,
405 "controller can't do 64bit DMA, forcing 32bit\n");
406 cap &= ~HOST_CAP_64;
407 }
408
409 if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
410 dev_printk(KERN_INFO, dev,
411 "controller can't do NCQ, turning off CAP_NCQ\n");
412 cap &= ~HOST_CAP_NCQ;
413 }
414
415 if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
416 dev_printk(KERN_INFO, dev,
417 "controller can do NCQ, turning on CAP_NCQ\n");
418 cap |= HOST_CAP_NCQ;
419 }
420
421 if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
422 dev_printk(KERN_INFO, dev,
423 "controller can't do PMP, turning off CAP_PMP\n");
424 cap &= ~HOST_CAP_PMP;
425 }
426
427 if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
428 dev_printk(KERN_INFO, dev,
429 "controller can't do SNTF, turning off CAP_SNTF\n");
430 cap &= ~HOST_CAP_SNTF;
431 }
432
433 if (force_port_map && port_map != force_port_map) {
434 dev_printk(KERN_INFO, dev, "forcing port_map 0x%x -> 0x%x\n",
435 port_map, force_port_map);
436 port_map = force_port_map;
437 }
438
439 if (mask_port_map) {
440 dev_printk(KERN_ERR, dev, "masking port_map 0x%x -> 0x%x\n",
441 port_map,
442 port_map & mask_port_map);
443 port_map &= mask_port_map;
444 }
445
446 /* cross check port_map and cap.n_ports */
447 if (port_map) {
448 int map_ports = 0;
449
450 for (i = 0; i < AHCI_MAX_PORTS; i++)
451 if (port_map & (1 << i))
452 map_ports++;
453
454 /* If PI has more ports than n_ports, whine, clear
455 * port_map and let it be generated from n_ports.
456 */
457 if (map_ports > ahci_nr_ports(cap)) {
458 dev_printk(KERN_WARNING, dev,
459 "implemented port map (0x%x) contains more "
460 "ports than nr_ports (%u), using nr_ports\n",
461 port_map, ahci_nr_ports(cap));
462 port_map = 0;
463 }
464 }
465
466 /* fabricate port_map from cap.nr_ports */
467 if (!port_map) {
468 port_map = (1 << ahci_nr_ports(cap)) - 1;
469 dev_printk(KERN_WARNING, dev,
470 "forcing PORTS_IMPL to 0x%x\n", port_map);
471
472 /* write the fixed up value to the PI register */
473 hpriv->saved_port_map = port_map;
474 }
475
476 /* record values to use during operation */
477 hpriv->cap = cap;
478 hpriv->cap2 = cap2;
479 hpriv->port_map = port_map;
480 }
481 EXPORT_SYMBOL_GPL(ahci_save_initial_config);
482
483 /**
484 * ahci_restore_initial_config - Restore initial config
485 * @host: target ATA host
486 *
487 * Restore initial config stored by ahci_save_initial_config().
488 *
489 * LOCKING:
490 * None.
491 */
492 static void ahci_restore_initial_config(struct ata_host *host)
493 {
494 struct ahci_host_priv *hpriv = host->private_data;
495 void __iomem *mmio = hpriv->mmio;
496
497 writel(hpriv->saved_cap, mmio + HOST_CAP);
498 if (hpriv->saved_cap2)
499 writel(hpriv->saved_cap2, mmio + HOST_CAP2);
500 writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
501 (void) readl(mmio + HOST_PORTS_IMPL); /* flush */
502 }
503
504 static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
505 {
506 static const int offset[] = {
507 [SCR_STATUS] = PORT_SCR_STAT,
508 [SCR_CONTROL] = PORT_SCR_CTL,
509 [SCR_ERROR] = PORT_SCR_ERR,
510 [SCR_ACTIVE] = PORT_SCR_ACT,
511 [SCR_NOTIFICATION] = PORT_SCR_NTF,
512 };
513 struct ahci_host_priv *hpriv = ap->host->private_data;
514
515 if (sc_reg < ARRAY_SIZE(offset) &&
516 (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
517 return offset[sc_reg];
518 return 0;
519 }
520
521 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
522 {
523 void __iomem *port_mmio = ahci_port_base(link->ap);
524 int offset = ahci_scr_offset(link->ap, sc_reg);
525
526 if (offset) {
527 *val = readl(port_mmio + offset);
528 return 0;
529 }
530 return -EINVAL;
531 }
532
533 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
534 {
535 void __iomem *port_mmio = ahci_port_base(link->ap);
536 int offset = ahci_scr_offset(link->ap, sc_reg);
537
538 if (offset) {
539 writel(val, port_mmio + offset);
540 return 0;
541 }
542 return -EINVAL;
543 }
544
545 void ahci_start_engine(struct ata_port *ap)
546 {
547 void __iomem *port_mmio = ahci_port_base(ap);
548 u32 tmp;
549
550 /* start DMA */
551 tmp = readl(port_mmio + PORT_CMD);
552 tmp |= PORT_CMD_START;
553 writel(tmp, port_mmio + PORT_CMD);
554 readl(port_mmio + PORT_CMD); /* flush */
555 }
556 EXPORT_SYMBOL_GPL(ahci_start_engine);
557
558 int ahci_stop_engine(struct ata_port *ap)
559 {
560 void __iomem *port_mmio = ahci_port_base(ap);
561 u32 tmp;
562
563 tmp = readl(port_mmio + PORT_CMD);
564
565 /* check if the HBA is idle */
566 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
567 return 0;
568
569 /* setting HBA to idle */
570 tmp &= ~PORT_CMD_START;
571 writel(tmp, port_mmio + PORT_CMD);
572
573 /* wait for engine to stop. This could be as long as 500 msec */
574 tmp = ata_wait_register(port_mmio + PORT_CMD,
575 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
576 if (tmp & PORT_CMD_LIST_ON)
577 return -EIO;
578
579 return 0;
580 }
581 EXPORT_SYMBOL_GPL(ahci_stop_engine);
582
583 static void ahci_start_fis_rx(struct ata_port *ap)
584 {
585 void __iomem *port_mmio = ahci_port_base(ap);
586 struct ahci_host_priv *hpriv = ap->host->private_data;
587 struct ahci_port_priv *pp = ap->private_data;
588 u32 tmp;
589
590 /* set FIS registers */
591 if (hpriv->cap & HOST_CAP_64)
592 writel((pp->cmd_slot_dma >> 16) >> 16,
593 port_mmio + PORT_LST_ADDR_HI);
594 writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
595
596 if (hpriv->cap & HOST_CAP_64)
597 writel((pp->rx_fis_dma >> 16) >> 16,
598 port_mmio + PORT_FIS_ADDR_HI);
599 writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
600
601 /* enable FIS reception */
602 tmp = readl(port_mmio + PORT_CMD);
603 tmp |= PORT_CMD_FIS_RX;
604 writel(tmp, port_mmio + PORT_CMD);
605
606 /* flush */
607 readl(port_mmio + PORT_CMD);
608 }
609
610 static int ahci_stop_fis_rx(struct ata_port *ap)
611 {
612 void __iomem *port_mmio = ahci_port_base(ap);
613 u32 tmp;
614
615 /* disable FIS reception */
616 tmp = readl(port_mmio + PORT_CMD);
617 tmp &= ~PORT_CMD_FIS_RX;
618 writel(tmp, port_mmio + PORT_CMD);
619
620 /* wait for completion, spec says 500ms, give it 1000 */
621 tmp = ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
622 PORT_CMD_FIS_ON, 10, 1000);
623 if (tmp & PORT_CMD_FIS_ON)
624 return -EBUSY;
625
626 return 0;
627 }
628
629 static void ahci_power_up(struct ata_port *ap)
630 {
631 struct ahci_host_priv *hpriv = ap->host->private_data;
632 void __iomem *port_mmio = ahci_port_base(ap);
633 u32 cmd;
634
635 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
636
637 /* spin up device */
638 if (hpriv->cap & HOST_CAP_SSS) {
639 cmd |= PORT_CMD_SPIN_UP;
640 writel(cmd, port_mmio + PORT_CMD);
641 }
642
643 /* wake up link */
644 writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
645 }
646
647 static void ahci_disable_alpm(struct ata_port *ap)
648 {
649 struct ahci_host_priv *hpriv = ap->host->private_data;
650 void __iomem *port_mmio = ahci_port_base(ap);
651 u32 cmd;
652 struct ahci_port_priv *pp = ap->private_data;
653
654 /* IPM bits should be disabled by libata-core */
655 /* get the existing command bits */
656 cmd = readl(port_mmio + PORT_CMD);
657
658 /* disable ALPM and ASP */
659 cmd &= ~PORT_CMD_ASP;
660 cmd &= ~PORT_CMD_ALPE;
661
662 /* force the interface back to active */
663 cmd |= PORT_CMD_ICC_ACTIVE;
664
665 /* write out new cmd value */
666 writel(cmd, port_mmio + PORT_CMD);
667 cmd = readl(port_mmio + PORT_CMD);
668
669 /* wait 10ms to be sure we've come out of any low power state */
670 msleep(10);
671
672 /* clear out any PhyRdy stuff from interrupt status */
673 writel(PORT_IRQ_PHYRDY, port_mmio + PORT_IRQ_STAT);
674
675 /* go ahead and clean out PhyRdy Change from Serror too */
676 ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
677
678 /*
679 * Clear flag to indicate that we should ignore all PhyRdy
680 * state changes
681 */
682 hpriv->flags &= ~AHCI_HFLAG_NO_HOTPLUG;
683
684 /*
685 * Enable interrupts on Phy Ready.
686 */
687 pp->intr_mask |= PORT_IRQ_PHYRDY;
688 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
689
690 /*
691 * don't change the link pm policy - we can be called
692 * just to turn of link pm temporarily
693 */
694 }
695
696 static int ahci_enable_alpm(struct ata_port *ap,
697 enum link_pm policy)
698 {
699 struct ahci_host_priv *hpriv = ap->host->private_data;
700 void __iomem *port_mmio = ahci_port_base(ap);
701 u32 cmd;
702 struct ahci_port_priv *pp = ap->private_data;
703 u32 asp;
704
705 /* Make sure the host is capable of link power management */
706 if (!(hpriv->cap & HOST_CAP_ALPM))
707 return -EINVAL;
708
709 switch (policy) {
710 case MAX_PERFORMANCE:
711 case NOT_AVAILABLE:
712 /*
713 * if we came here with NOT_AVAILABLE,
714 * it just means this is the first time we
715 * have tried to enable - default to max performance,
716 * and let the user go to lower power modes on request.
717 */
718 ahci_disable_alpm(ap);
719 return 0;
720 case MIN_POWER:
721 /* configure HBA to enter SLUMBER */
722 asp = PORT_CMD_ASP;
723 break;
724 case MEDIUM_POWER:
725 /* configure HBA to enter PARTIAL */
726 asp = 0;
727 break;
728 default:
729 return -EINVAL;
730 }
731
732 /*
733 * Disable interrupts on Phy Ready. This keeps us from
734 * getting woken up due to spurious phy ready interrupts
735 * TBD - Hot plug should be done via polling now, is
736 * that even supported?
737 */
738 pp->intr_mask &= ~PORT_IRQ_PHYRDY;
739 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
740
741 /*
742 * Set a flag to indicate that we should ignore all PhyRdy
743 * state changes since these can happen now whenever we
744 * change link state
745 */
746 hpriv->flags |= AHCI_HFLAG_NO_HOTPLUG;
747
748 /* get the existing command bits */
749 cmd = readl(port_mmio + PORT_CMD);
750
751 /*
752 * Set ASP based on Policy
753 */
754 cmd |= asp;
755
756 /*
757 * Setting this bit will instruct the HBA to aggressively
758 * enter a lower power link state when it's appropriate and
759 * based on the value set above for ASP
760 */
761 cmd |= PORT_CMD_ALPE;
762
763 /* write out new cmd value */
764 writel(cmd, port_mmio + PORT_CMD);
765 cmd = readl(port_mmio + PORT_CMD);
766
767 /* IPM bits should be set by libata-core */
768 return 0;
769 }
770
771 #ifdef CONFIG_PM
772 static void ahci_power_down(struct ata_port *ap)
773 {
774 struct ahci_host_priv *hpriv = ap->host->private_data;
775 void __iomem *port_mmio = ahci_port_base(ap);
776 u32 cmd, scontrol;
777
778 if (!(hpriv->cap & HOST_CAP_SSS))
779 return;
780
781 /* put device into listen mode, first set PxSCTL.DET to 0 */
782 scontrol = readl(port_mmio + PORT_SCR_CTL);
783 scontrol &= ~0xf;
784 writel(scontrol, port_mmio + PORT_SCR_CTL);
785
786 /* then set PxCMD.SUD to 0 */
787 cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
788 cmd &= ~PORT_CMD_SPIN_UP;
789 writel(cmd, port_mmio + PORT_CMD);
790 }
791 #endif
792
793 static void ahci_start_port(struct ata_port *ap)
794 {
795 struct ahci_port_priv *pp = ap->private_data;
796 struct ata_link *link;
797 struct ahci_em_priv *emp;
798 ssize_t rc;
799 int i;
800
801 /* enable FIS reception */
802 ahci_start_fis_rx(ap);
803
804 /* enable DMA */
805 ahci_start_engine(ap);
806
807 /* turn on LEDs */
808 if (ap->flags & ATA_FLAG_EM) {
809 ata_for_each_link(link, ap, EDGE) {
810 emp = &pp->em_priv[link->pmp];
811
812 /* EM Transmit bit maybe busy during init */
813 for (i = 0; i < EM_MAX_RETRY; i++) {
814 rc = ahci_transmit_led_message(ap,
815 emp->led_state,
816 4);
817 if (rc == -EBUSY)
818 msleep(1);
819 else
820 break;
821 }
822 }
823 }
824
825 if (ap->flags & ATA_FLAG_SW_ACTIVITY)
826 ata_for_each_link(link, ap, EDGE)
827 ahci_init_sw_activity(link);
828
829 }
830
831 static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
832 {
833 int rc;
834
835 /* disable DMA */
836 rc = ahci_stop_engine(ap);
837 if (rc) {
838 *emsg = "failed to stop engine";
839 return rc;
840 }
841
842 /* disable FIS reception */
843 rc = ahci_stop_fis_rx(ap);
844 if (rc) {
845 *emsg = "failed stop FIS RX";
846 return rc;
847 }
848
849 return 0;
850 }
851
852 int ahci_reset_controller(struct ata_host *host)
853 {
854 struct ahci_host_priv *hpriv = host->private_data;
855 void __iomem *mmio = hpriv->mmio;
856 u32 tmp;
857
858 /* we must be in AHCI mode, before using anything
859 * AHCI-specific, such as HOST_RESET.
860 */
861 ahci_enable_ahci(mmio);
862
863 /* global controller reset */
864 if (!ahci_skip_host_reset) {
865 tmp = readl(mmio + HOST_CTL);
866 if ((tmp & HOST_RESET) == 0) {
867 writel(tmp | HOST_RESET, mmio + HOST_CTL);
868 readl(mmio + HOST_CTL); /* flush */
869 }
870
871 /*
872 * to perform host reset, OS should set HOST_RESET
873 * and poll until this bit is read to be "0".
874 * reset must complete within 1 second, or
875 * the hardware should be considered fried.
876 */
877 tmp = ata_wait_register(mmio + HOST_CTL, HOST_RESET,
878 HOST_RESET, 10, 1000);
879
880 if (tmp & HOST_RESET) {
881 dev_printk(KERN_ERR, host->dev,
882 "controller reset failed (0x%x)\n", tmp);
883 return -EIO;
884 }
885
886 /* turn on AHCI mode */
887 ahci_enable_ahci(mmio);
888
889 /* Some registers might be cleared on reset. Restore
890 * initial values.
891 */
892 ahci_restore_initial_config(host);
893 } else
894 dev_printk(KERN_INFO, host->dev,
895 "skipping global host reset\n");
896
897 return 0;
898 }
899 EXPORT_SYMBOL_GPL(ahci_reset_controller);
900
901 static void ahci_sw_activity(struct ata_link *link)
902 {
903 struct ata_port *ap = link->ap;
904 struct ahci_port_priv *pp = ap->private_data;
905 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
906
907 if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
908 return;
909
910 emp->activity++;
911 if (!timer_pending(&emp->timer))
912 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
913 }
914
915 static void ahci_sw_activity_blink(unsigned long arg)
916 {
917 struct ata_link *link = (struct ata_link *)arg;
918 struct ata_port *ap = link->ap;
919 struct ahci_port_priv *pp = ap->private_data;
920 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
921 unsigned long led_message = emp->led_state;
922 u32 activity_led_state;
923 unsigned long flags;
924
925 led_message &= EM_MSG_LED_VALUE;
926 led_message |= ap->port_no | (link->pmp << 8);
927
928 /* check to see if we've had activity. If so,
929 * toggle state of LED and reset timer. If not,
930 * turn LED to desired idle state.
931 */
932 spin_lock_irqsave(ap->lock, flags);
933 if (emp->saved_activity != emp->activity) {
934 emp->saved_activity = emp->activity;
935 /* get the current LED state */
936 activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
937
938 if (activity_led_state)
939 activity_led_state = 0;
940 else
941 activity_led_state = 1;
942
943 /* clear old state */
944 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
945
946 /* toggle state */
947 led_message |= (activity_led_state << 16);
948 mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
949 } else {
950 /* switch to idle */
951 led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
952 if (emp->blink_policy == BLINK_OFF)
953 led_message |= (1 << 16);
954 }
955 spin_unlock_irqrestore(ap->lock, flags);
956 ahci_transmit_led_message(ap, led_message, 4);
957 }
958
959 static void ahci_init_sw_activity(struct ata_link *link)
960 {
961 struct ata_port *ap = link->ap;
962 struct ahci_port_priv *pp = ap->private_data;
963 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
964
965 /* init activity stats, setup timer */
966 emp->saved_activity = emp->activity = 0;
967 setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
968
969 /* check our blink policy and set flag for link if it's enabled */
970 if (emp->blink_policy)
971 link->flags |= ATA_LFLAG_SW_ACTIVITY;
972 }
973
974 int ahci_reset_em(struct ata_host *host)
975 {
976 struct ahci_host_priv *hpriv = host->private_data;
977 void __iomem *mmio = hpriv->mmio;
978 u32 em_ctl;
979
980 em_ctl = readl(mmio + HOST_EM_CTL);
981 if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
982 return -EINVAL;
983
984 writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
985 return 0;
986 }
987 EXPORT_SYMBOL_GPL(ahci_reset_em);
988
989 static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
990 ssize_t size)
991 {
992 struct ahci_host_priv *hpriv = ap->host->private_data;
993 struct ahci_port_priv *pp = ap->private_data;
994 void __iomem *mmio = hpriv->mmio;
995 u32 em_ctl;
996 u32 message[] = {0, 0};
997 unsigned long flags;
998 int pmp;
999 struct ahci_em_priv *emp;
1000
1001 /* get the slot number from the message */
1002 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1003 if (pmp < EM_MAX_SLOTS)
1004 emp = &pp->em_priv[pmp];
1005 else
1006 return -EINVAL;
1007
1008 spin_lock_irqsave(ap->lock, flags);
1009
1010 /*
1011 * if we are still busy transmitting a previous message,
1012 * do not allow
1013 */
1014 em_ctl = readl(mmio + HOST_EM_CTL);
1015 if (em_ctl & EM_CTL_TM) {
1016 spin_unlock_irqrestore(ap->lock, flags);
1017 return -EBUSY;
1018 }
1019
1020 if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
1021 /*
1022 * create message header - this is all zero except for
1023 * the message size, which is 4 bytes.
1024 */
1025 message[0] |= (4 << 8);
1026
1027 /* ignore 0:4 of byte zero, fill in port info yourself */
1028 message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
1029
1030 /* write message to EM_LOC */
1031 writel(message[0], mmio + hpriv->em_loc);
1032 writel(message[1], mmio + hpriv->em_loc+4);
1033
1034 /*
1035 * tell hardware to transmit the message
1036 */
1037 writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1038 }
1039
1040 /* save off new led state for port/slot */
1041 emp->led_state = state;
1042
1043 spin_unlock_irqrestore(ap->lock, flags);
1044 return size;
1045 }
1046
1047 static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1048 {
1049 struct ahci_port_priv *pp = ap->private_data;
1050 struct ata_link *link;
1051 struct ahci_em_priv *emp;
1052 int rc = 0;
1053
1054 ata_for_each_link(link, ap, EDGE) {
1055 emp = &pp->em_priv[link->pmp];
1056 rc += sprintf(buf, "%lx\n", emp->led_state);
1057 }
1058 return rc;
1059 }
1060
1061 static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1062 size_t size)
1063 {
1064 int state;
1065 int pmp;
1066 struct ahci_port_priv *pp = ap->private_data;
1067 struct ahci_em_priv *emp;
1068
1069 state = simple_strtoul(buf, NULL, 0);
1070
1071 /* get the slot number from the message */
1072 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1073 if (pmp < EM_MAX_SLOTS)
1074 emp = &pp->em_priv[pmp];
1075 else
1076 return -EINVAL;
1077
1078 /* mask off the activity bits if we are in sw_activity
1079 * mode, user should turn off sw_activity before setting
1080 * activity led through em_message
1081 */
1082 if (emp->blink_policy)
1083 state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1084
1085 return ahci_transmit_led_message(ap, state, size);
1086 }
1087
1088 static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1089 {
1090 struct ata_link *link = dev->link;
1091 struct ata_port *ap = link->ap;
1092 struct ahci_port_priv *pp = ap->private_data;
1093 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1094 u32 port_led_state = emp->led_state;
1095
1096 /* save the desired Activity LED behavior */
1097 if (val == OFF) {
1098 /* clear LFLAG */
1099 link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1100
1101 /* set the LED to OFF */
1102 port_led_state &= EM_MSG_LED_VALUE_OFF;
1103 port_led_state |= (ap->port_no | (link->pmp << 8));
1104 ahci_transmit_led_message(ap, port_led_state, 4);
1105 } else {
1106 link->flags |= ATA_LFLAG_SW_ACTIVITY;
1107 if (val == BLINK_OFF) {
1108 /* set LED to ON for idle */
1109 port_led_state &= EM_MSG_LED_VALUE_OFF;
1110 port_led_state |= (ap->port_no | (link->pmp << 8));
1111 port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1112 ahci_transmit_led_message(ap, port_led_state, 4);
1113 }
1114 }
1115 emp->blink_policy = val;
1116 return 0;
1117 }
1118
1119 static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1120 {
1121 struct ata_link *link = dev->link;
1122 struct ata_port *ap = link->ap;
1123 struct ahci_port_priv *pp = ap->private_data;
1124 struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1125
1126 /* display the saved value of activity behavior for this
1127 * disk.
1128 */
1129 return sprintf(buf, "%d\n", emp->blink_policy);
1130 }
1131
1132 static void ahci_port_init(struct device *dev, struct ata_port *ap,
1133 int port_no, void __iomem *mmio,
1134 void __iomem *port_mmio)
1135 {
1136 const char *emsg = NULL;
1137 int rc;
1138 u32 tmp;
1139
1140 /* make sure port is not active */
1141 rc = ahci_deinit_port(ap, &emsg);
1142 if (rc)
1143 dev_warn(dev, "%s (%d)\n", emsg, rc);
1144
1145 /* clear SError */
1146 tmp = readl(port_mmio + PORT_SCR_ERR);
1147 VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1148 writel(tmp, port_mmio + PORT_SCR_ERR);
1149
1150 /* clear port IRQ */
1151 tmp = readl(port_mmio + PORT_IRQ_STAT);
1152 VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1153 if (tmp)
1154 writel(tmp, port_mmio + PORT_IRQ_STAT);
1155
1156 writel(1 << port_no, mmio + HOST_IRQ_STAT);
1157 }
1158
1159 void ahci_init_controller(struct ata_host *host)
1160 {
1161 struct ahci_host_priv *hpriv = host->private_data;
1162 void __iomem *mmio = hpriv->mmio;
1163 int i;
1164 void __iomem *port_mmio;
1165 u32 tmp;
1166
1167 for (i = 0; i < host->n_ports; i++) {
1168 struct ata_port *ap = host->ports[i];
1169
1170 port_mmio = ahci_port_base(ap);
1171 if (ata_port_is_dummy(ap))
1172 continue;
1173
1174 ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1175 }
1176
1177 tmp = readl(mmio + HOST_CTL);
1178 VPRINTK("HOST_CTL 0x%x\n", tmp);
1179 writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1180 tmp = readl(mmio + HOST_CTL);
1181 VPRINTK("HOST_CTL 0x%x\n", tmp);
1182 }
1183 EXPORT_SYMBOL_GPL(ahci_init_controller);
1184
1185 static void ahci_dev_config(struct ata_device *dev)
1186 {
1187 struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1188
1189 if (hpriv->flags & AHCI_HFLAG_SECT255) {
1190 dev->max_sectors = 255;
1191 ata_dev_printk(dev, KERN_INFO,
1192 "SB600 AHCI: limiting to 255 sectors per cmd\n");
1193 }
1194 }
1195
1196 static unsigned int ahci_dev_classify(struct ata_port *ap)
1197 {
1198 void __iomem *port_mmio = ahci_port_base(ap);
1199 struct ata_taskfile tf;
1200 u32 tmp;
1201
1202 tmp = readl(port_mmio + PORT_SIG);
1203 tf.lbah = (tmp >> 24) & 0xff;
1204 tf.lbam = (tmp >> 16) & 0xff;
1205 tf.lbal = (tmp >> 8) & 0xff;
1206 tf.nsect = (tmp) & 0xff;
1207
1208 return ata_dev_classify(&tf);
1209 }
1210
1211 static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1212 u32 opts)
1213 {
1214 dma_addr_t cmd_tbl_dma;
1215
1216 cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1217
1218 pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1219 pp->cmd_slot[tag].status = 0;
1220 pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1221 pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1222 }
1223
1224 int ahci_kick_engine(struct ata_port *ap)
1225 {
1226 void __iomem *port_mmio = ahci_port_base(ap);
1227 struct ahci_host_priv *hpriv = ap->host->private_data;
1228 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1229 u32 tmp;
1230 int busy, rc;
1231
1232 /* stop engine */
1233 rc = ahci_stop_engine(ap);
1234 if (rc)
1235 goto out_restart;
1236
1237 /* need to do CLO?
1238 * always do CLO if PMP is attached (AHCI-1.3 9.2)
1239 */
1240 busy = status & (ATA_BUSY | ATA_DRQ);
1241 if (!busy && !sata_pmp_attached(ap)) {
1242 rc = 0;
1243 goto out_restart;
1244 }
1245
1246 if (!(hpriv->cap & HOST_CAP_CLO)) {
1247 rc = -EOPNOTSUPP;
1248 goto out_restart;
1249 }
1250
1251 /* perform CLO */
1252 tmp = readl(port_mmio + PORT_CMD);
1253 tmp |= PORT_CMD_CLO;
1254 writel(tmp, port_mmio + PORT_CMD);
1255
1256 rc = 0;
1257 tmp = ata_wait_register(port_mmio + PORT_CMD,
1258 PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1259 if (tmp & PORT_CMD_CLO)
1260 rc = -EIO;
1261
1262 /* restart engine */
1263 out_restart:
1264 ahci_start_engine(ap);
1265 return rc;
1266 }
1267 EXPORT_SYMBOL_GPL(ahci_kick_engine);
1268
1269 static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1270 struct ata_taskfile *tf, int is_cmd, u16 flags,
1271 unsigned long timeout_msec)
1272 {
1273 const u32 cmd_fis_len = 5; /* five dwords */
1274 struct ahci_port_priv *pp = ap->private_data;
1275 void __iomem *port_mmio = ahci_port_base(ap);
1276 u8 *fis = pp->cmd_tbl;
1277 u32 tmp;
1278
1279 /* prep the command */
1280 ata_tf_to_fis(tf, pmp, is_cmd, fis);
1281 ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1282
1283 /* issue & wait */
1284 writel(1, port_mmio + PORT_CMD_ISSUE);
1285
1286 if (timeout_msec) {
1287 tmp = ata_wait_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x1,
1288 1, timeout_msec);
1289 if (tmp & 0x1) {
1290 ahci_kick_engine(ap);
1291 return -EBUSY;
1292 }
1293 } else
1294 readl(port_mmio + PORT_CMD_ISSUE); /* flush */
1295
1296 return 0;
1297 }
1298
1299 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1300 int pmp, unsigned long deadline,
1301 int (*check_ready)(struct ata_link *link))
1302 {
1303 struct ata_port *ap = link->ap;
1304 struct ahci_host_priv *hpriv = ap->host->private_data;
1305 const char *reason = NULL;
1306 unsigned long now, msecs;
1307 struct ata_taskfile tf;
1308 int rc;
1309
1310 DPRINTK("ENTER\n");
1311
1312 /* prepare for SRST (AHCI-1.1 10.4.1) */
1313 rc = ahci_kick_engine(ap);
1314 if (rc && rc != -EOPNOTSUPP)
1315 ata_link_printk(link, KERN_WARNING,
1316 "failed to reset engine (errno=%d)\n", rc);
1317
1318 ata_tf_init(link->device, &tf);
1319
1320 /* issue the first D2H Register FIS */
1321 msecs = 0;
1322 now = jiffies;
1323 if (time_after(now, deadline))
1324 msecs = jiffies_to_msecs(deadline - now);
1325
1326 tf.ctl |= ATA_SRST;
1327 if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1328 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1329 rc = -EIO;
1330 reason = "1st FIS failed";
1331 goto fail;
1332 }
1333
1334 /* spec says at least 5us, but be generous and sleep for 1ms */
1335 msleep(1);
1336
1337 /* issue the second D2H Register FIS */
1338 tf.ctl &= ~ATA_SRST;
1339 ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1340
1341 /* wait for link to become ready */
1342 rc = ata_wait_after_reset(link, deadline, check_ready);
1343 if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1344 /*
1345 * Workaround for cases where link online status can't
1346 * be trusted. Treat device readiness timeout as link
1347 * offline.
1348 */
1349 ata_link_printk(link, KERN_INFO,
1350 "device not ready, treating as offline\n");
1351 *class = ATA_DEV_NONE;
1352 } else if (rc) {
1353 /* link occupied, -ENODEV too is an error */
1354 reason = "device not ready";
1355 goto fail;
1356 } else
1357 *class = ahci_dev_classify(ap);
1358
1359 DPRINTK("EXIT, class=%u\n", *class);
1360 return 0;
1361
1362 fail:
1363 ata_link_printk(link, KERN_ERR, "softreset failed (%s)\n", reason);
1364 return rc;
1365 }
1366
1367 int ahci_check_ready(struct ata_link *link)
1368 {
1369 void __iomem *port_mmio = ahci_port_base(link->ap);
1370 u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1371
1372 return ata_check_ready(status);
1373 }
1374 EXPORT_SYMBOL_GPL(ahci_check_ready);
1375
1376 static int ahci_softreset(struct ata_link *link, unsigned int *class,
1377 unsigned long deadline)
1378 {
1379 int pmp = sata_srst_pmp(link);
1380
1381 DPRINTK("ENTER\n");
1382
1383 return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1384 }
1385 EXPORT_SYMBOL_GPL(ahci_do_softreset);
1386
1387 static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1388 unsigned long deadline)
1389 {
1390 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1391 struct ata_port *ap = link->ap;
1392 struct ahci_port_priv *pp = ap->private_data;
1393 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1394 struct ata_taskfile tf;
1395 bool online;
1396 int rc;
1397
1398 DPRINTK("ENTER\n");
1399
1400 ahci_stop_engine(ap);
1401
1402 /* clear D2H reception area to properly wait for D2H FIS */
1403 ata_tf_init(link->device, &tf);
1404 tf.command = 0x80;
1405 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1406
1407 rc = sata_link_hardreset(link, timing, deadline, &online,
1408 ahci_check_ready);
1409
1410 ahci_start_engine(ap);
1411
1412 if (online)
1413 *class = ahci_dev_classify(ap);
1414
1415 DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1416 return rc;
1417 }
1418
1419 static void ahci_postreset(struct ata_link *link, unsigned int *class)
1420 {
1421 struct ata_port *ap = link->ap;
1422 void __iomem *port_mmio = ahci_port_base(ap);
1423 u32 new_tmp, tmp;
1424
1425 ata_std_postreset(link, class);
1426
1427 /* Make sure port's ATAPI bit is set appropriately */
1428 new_tmp = tmp = readl(port_mmio + PORT_CMD);
1429 if (*class == ATA_DEV_ATAPI)
1430 new_tmp |= PORT_CMD_ATAPI;
1431 else
1432 new_tmp &= ~PORT_CMD_ATAPI;
1433 if (new_tmp != tmp) {
1434 writel(new_tmp, port_mmio + PORT_CMD);
1435 readl(port_mmio + PORT_CMD); /* flush */
1436 }
1437 }
1438
1439 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1440 {
1441 struct scatterlist *sg;
1442 struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1443 unsigned int si;
1444
1445 VPRINTK("ENTER\n");
1446
1447 /*
1448 * Next, the S/G list.
1449 */
1450 for_each_sg(qc->sg, sg, qc->n_elem, si) {
1451 dma_addr_t addr = sg_dma_address(sg);
1452 u32 sg_len = sg_dma_len(sg);
1453
1454 ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1455 ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1456 ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1457 }
1458
1459 return si;
1460 }
1461
1462 static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1463 {
1464 struct ata_port *ap = qc->ap;
1465 struct ahci_port_priv *pp = ap->private_data;
1466
1467 if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1468 return ata_std_qc_defer(qc);
1469 else
1470 return sata_pmp_qc_defer_cmd_switch(qc);
1471 }
1472
1473 static void ahci_qc_prep(struct ata_queued_cmd *qc)
1474 {
1475 struct ata_port *ap = qc->ap;
1476 struct ahci_port_priv *pp = ap->private_data;
1477 int is_atapi = ata_is_atapi(qc->tf.protocol);
1478 void *cmd_tbl;
1479 u32 opts;
1480 const u32 cmd_fis_len = 5; /* five dwords */
1481 unsigned int n_elem;
1482
1483 /*
1484 * Fill in command table information. First, the header,
1485 * a SATA Register - Host to Device command FIS.
1486 */
1487 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1488
1489 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1490 if (is_atapi) {
1491 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1492 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1493 }
1494
1495 n_elem = 0;
1496 if (qc->flags & ATA_QCFLAG_DMAMAP)
1497 n_elem = ahci_fill_sg(qc, cmd_tbl);
1498
1499 /*
1500 * Fill in command slot information.
1501 */
1502 opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1503 if (qc->tf.flags & ATA_TFLAG_WRITE)
1504 opts |= AHCI_CMD_WRITE;
1505 if (is_atapi)
1506 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1507
1508 ahci_fill_cmd_slot(pp, qc->tag, opts);
1509 }
1510
1511 static void ahci_fbs_dec_intr(struct ata_port *ap)
1512 {
1513 struct ahci_port_priv *pp = ap->private_data;
1514 void __iomem *port_mmio = ahci_port_base(ap);
1515 u32 fbs = readl(port_mmio + PORT_FBS);
1516 int retries = 3;
1517
1518 DPRINTK("ENTER\n");
1519 BUG_ON(!pp->fbs_enabled);
1520
1521 /* time to wait for DEC is not specified by AHCI spec,
1522 * add a retry loop for safety.
1523 */
1524 writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1525 fbs = readl(port_mmio + PORT_FBS);
1526 while ((fbs & PORT_FBS_DEC) && retries--) {
1527 udelay(1);
1528 fbs = readl(port_mmio + PORT_FBS);
1529 }
1530
1531 if (fbs & PORT_FBS_DEC)
1532 dev_printk(KERN_ERR, ap->host->dev,
1533 "failed to clear device error\n");
1534 }
1535
1536 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1537 {
1538 struct ahci_host_priv *hpriv = ap->host->private_data;
1539 struct ahci_port_priv *pp = ap->private_data;
1540 struct ata_eh_info *host_ehi = &ap->link.eh_info;
1541 struct ata_link *link = NULL;
1542 struct ata_queued_cmd *active_qc;
1543 struct ata_eh_info *active_ehi;
1544 bool fbs_need_dec = false;
1545 u32 serror;
1546
1547 /* determine active link with error */
1548 if (pp->fbs_enabled) {
1549 void __iomem *port_mmio = ahci_port_base(ap);
1550 u32 fbs = readl(port_mmio + PORT_FBS);
1551 int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1552
1553 if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1554 ata_link_online(&ap->pmp_link[pmp])) {
1555 link = &ap->pmp_link[pmp];
1556 fbs_need_dec = true;
1557 }
1558
1559 } else
1560 ata_for_each_link(link, ap, EDGE)
1561 if (ata_link_active(link))
1562 break;
1563
1564 if (!link)
1565 link = &ap->link;
1566
1567 active_qc = ata_qc_from_tag(ap, link->active_tag);
1568 active_ehi = &link->eh_info;
1569
1570 /* record irq stat */
1571 ata_ehi_clear_desc(host_ehi);
1572 ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1573
1574 /* AHCI needs SError cleared; otherwise, it might lock up */
1575 ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1576 ahci_scr_write(&ap->link, SCR_ERROR, serror);
1577 host_ehi->serror |= serror;
1578
1579 /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1580 if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1581 irq_stat &= ~PORT_IRQ_IF_ERR;
1582
1583 if (irq_stat & PORT_IRQ_TF_ERR) {
1584 /* If qc is active, charge it; otherwise, the active
1585 * link. There's no active qc on NCQ errors. It will
1586 * be determined by EH by reading log page 10h.
1587 */
1588 if (active_qc)
1589 active_qc->err_mask |= AC_ERR_DEV;
1590 else
1591 active_ehi->err_mask |= AC_ERR_DEV;
1592
1593 if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1594 host_ehi->serror &= ~SERR_INTERNAL;
1595 }
1596
1597 if (irq_stat & PORT_IRQ_UNK_FIS) {
1598 u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1599
1600 active_ehi->err_mask |= AC_ERR_HSM;
1601 active_ehi->action |= ATA_EH_RESET;
1602 ata_ehi_push_desc(active_ehi,
1603 "unknown FIS %08x %08x %08x %08x" ,
1604 unk[0], unk[1], unk[2], unk[3]);
1605 }
1606
1607 if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1608 active_ehi->err_mask |= AC_ERR_HSM;
1609 active_ehi->action |= ATA_EH_RESET;
1610 ata_ehi_push_desc(active_ehi, "incorrect PMP");
1611 }
1612
1613 if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1614 host_ehi->err_mask |= AC_ERR_HOST_BUS;
1615 host_ehi->action |= ATA_EH_RESET;
1616 ata_ehi_push_desc(host_ehi, "host bus error");
1617 }
1618
1619 if (irq_stat & PORT_IRQ_IF_ERR) {
1620 if (fbs_need_dec)
1621 active_ehi->err_mask |= AC_ERR_DEV;
1622 else {
1623 host_ehi->err_mask |= AC_ERR_ATA_BUS;
1624 host_ehi->action |= ATA_EH_RESET;
1625 }
1626
1627 ata_ehi_push_desc(host_ehi, "interface fatal error");
1628 }
1629
1630 if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1631 ata_ehi_hotplugged(host_ehi);
1632 ata_ehi_push_desc(host_ehi, "%s",
1633 irq_stat & PORT_IRQ_CONNECT ?
1634 "connection status changed" : "PHY RDY changed");
1635 }
1636
1637 /* okay, let's hand over to EH */
1638
1639 if (irq_stat & PORT_IRQ_FREEZE)
1640 ata_port_freeze(ap);
1641 else if (fbs_need_dec) {
1642 ata_link_abort(link);
1643 ahci_fbs_dec_intr(ap);
1644 } else
1645 ata_port_abort(ap);
1646 }
1647
1648 static void ahci_port_intr(struct ata_port *ap)
1649 {
1650 void __iomem *port_mmio = ahci_port_base(ap);
1651 struct ata_eh_info *ehi = &ap->link.eh_info;
1652 struct ahci_port_priv *pp = ap->private_data;
1653 struct ahci_host_priv *hpriv = ap->host->private_data;
1654 int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1655 u32 status, qc_active = 0;
1656 int rc;
1657
1658 status = readl(port_mmio + PORT_IRQ_STAT);
1659 writel(status, port_mmio + PORT_IRQ_STAT);
1660
1661 /* ignore BAD_PMP while resetting */
1662 if (unlikely(resetting))
1663 status &= ~PORT_IRQ_BAD_PMP;
1664
1665 /* If we are getting PhyRdy, this is
1666 * just a power state change, we should
1667 * clear out this, plus the PhyRdy/Comm
1668 * Wake bits from Serror
1669 */
1670 if ((hpriv->flags & AHCI_HFLAG_NO_HOTPLUG) &&
1671 (status & PORT_IRQ_PHYRDY)) {
1672 status &= ~PORT_IRQ_PHYRDY;
1673 ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
1674 }
1675
1676 if (unlikely(status & PORT_IRQ_ERROR)) {
1677 ahci_error_intr(ap, status);
1678 return;
1679 }
1680
1681 if (status & PORT_IRQ_SDB_FIS) {
1682 /* If SNotification is available, leave notification
1683 * handling to sata_async_notification(). If not,
1684 * emulate it by snooping SDB FIS RX area.
1685 *
1686 * Snooping FIS RX area is probably cheaper than
1687 * poking SNotification but some constrollers which
1688 * implement SNotification, ICH9 for example, don't
1689 * store AN SDB FIS into receive area.
1690 */
1691 if (hpriv->cap & HOST_CAP_SNTF)
1692 sata_async_notification(ap);
1693 else {
1694 /* If the 'N' bit in word 0 of the FIS is set,
1695 * we just received asynchronous notification.
1696 * Tell libata about it.
1697 *
1698 * Lack of SNotification should not appear in
1699 * ahci 1.2, so the workaround is unnecessary
1700 * when FBS is enabled.
1701 */
1702 if (pp->fbs_enabled)
1703 WARN_ON_ONCE(1);
1704 else {
1705 const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1706 u32 f0 = le32_to_cpu(f[0]);
1707 if (f0 & (1 << 15))
1708 sata_async_notification(ap);
1709 }
1710 }
1711 }
1712
1713 /* pp->active_link is not reliable once FBS is enabled, both
1714 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1715 * NCQ and non-NCQ commands may be in flight at the same time.
1716 */
1717 if (pp->fbs_enabled) {
1718 if (ap->qc_active) {
1719 qc_active = readl(port_mmio + PORT_SCR_ACT);
1720 qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1721 }
1722 } else {
1723 /* pp->active_link is valid iff any command is in flight */
1724 if (ap->qc_active && pp->active_link->sactive)
1725 qc_active = readl(port_mmio + PORT_SCR_ACT);
1726 else
1727 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1728 }
1729
1730
1731 rc = ata_qc_complete_multiple(ap, qc_active);
1732
1733 /* while resetting, invalid completions are expected */
1734 if (unlikely(rc < 0 && !resetting)) {
1735 ehi->err_mask |= AC_ERR_HSM;
1736 ehi->action |= ATA_EH_RESET;
1737 ata_port_freeze(ap);
1738 }
1739 }
1740
1741 irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1742 {
1743 struct ata_host *host = dev_instance;
1744 struct ahci_host_priv *hpriv;
1745 unsigned int i, handled = 0;
1746 void __iomem *mmio;
1747 u32 irq_stat, irq_masked;
1748
1749 VPRINTK("ENTER\n");
1750
1751 hpriv = host->private_data;
1752 mmio = hpriv->mmio;
1753
1754 /* sigh. 0xffffffff is a valid return from h/w */
1755 irq_stat = readl(mmio + HOST_IRQ_STAT);
1756 if (!irq_stat)
1757 return IRQ_NONE;
1758
1759 irq_masked = irq_stat & hpriv->port_map;
1760
1761 spin_lock(&host->lock);
1762
1763 for (i = 0; i < host->n_ports; i++) {
1764 struct ata_port *ap;
1765
1766 if (!(irq_masked & (1 << i)))
1767 continue;
1768
1769 ap = host->ports[i];
1770 if (ap) {
1771 ahci_port_intr(ap);
1772 VPRINTK("port %u\n", i);
1773 } else {
1774 VPRINTK("port %u (no irq)\n", i);
1775 if (ata_ratelimit())
1776 dev_printk(KERN_WARNING, host->dev,
1777 "interrupt on disabled port %u\n", i);
1778 }
1779
1780 handled = 1;
1781 }
1782
1783 /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1784 * it should be cleared after all the port events are cleared;
1785 * otherwise, it will raise a spurious interrupt after each
1786 * valid one. Please read section 10.6.2 of ahci 1.1 for more
1787 * information.
1788 *
1789 * Also, use the unmasked value to clear interrupt as spurious
1790 * pending event on a dummy port might cause screaming IRQ.
1791 */
1792 writel(irq_stat, mmio + HOST_IRQ_STAT);
1793
1794 spin_unlock(&host->lock);
1795
1796 VPRINTK("EXIT\n");
1797
1798 return IRQ_RETVAL(handled);
1799 }
1800 EXPORT_SYMBOL_GPL(ahci_interrupt);
1801
1802 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1803 {
1804 struct ata_port *ap = qc->ap;
1805 void __iomem *port_mmio = ahci_port_base(ap);
1806 struct ahci_port_priv *pp = ap->private_data;
1807
1808 /* Keep track of the currently active link. It will be used
1809 * in completion path to determine whether NCQ phase is in
1810 * progress.
1811 */
1812 pp->active_link = qc->dev->link;
1813
1814 if (qc->tf.protocol == ATA_PROT_NCQ)
1815 writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1816
1817 if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1818 u32 fbs = readl(port_mmio + PORT_FBS);
1819 fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1820 fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1821 writel(fbs, port_mmio + PORT_FBS);
1822 pp->fbs_last_dev = qc->dev->link->pmp;
1823 }
1824
1825 writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1826
1827 ahci_sw_activity(qc->dev->link);
1828
1829 return 0;
1830 }
1831
1832 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1833 {
1834 struct ahci_port_priv *pp = qc->ap->private_data;
1835 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1836
1837 if (pp->fbs_enabled)
1838 d2h_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1839
1840 ata_tf_from_fis(d2h_fis, &qc->result_tf);
1841 return true;
1842 }
1843
1844 static void ahci_freeze(struct ata_port *ap)
1845 {
1846 void __iomem *port_mmio = ahci_port_base(ap);
1847
1848 /* turn IRQ off */
1849 writel(0, port_mmio + PORT_IRQ_MASK);
1850 }
1851
1852 static void ahci_thaw(struct ata_port *ap)
1853 {
1854 struct ahci_host_priv *hpriv = ap->host->private_data;
1855 void __iomem *mmio = hpriv->mmio;
1856 void __iomem *port_mmio = ahci_port_base(ap);
1857 u32 tmp;
1858 struct ahci_port_priv *pp = ap->private_data;
1859
1860 /* clear IRQ */
1861 tmp = readl(port_mmio + PORT_IRQ_STAT);
1862 writel(tmp, port_mmio + PORT_IRQ_STAT);
1863 writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1864
1865 /* turn IRQ back on */
1866 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1867 }
1868
1869 static void ahci_error_handler(struct ata_port *ap)
1870 {
1871 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1872 /* restart engine */
1873 ahci_stop_engine(ap);
1874 ahci_start_engine(ap);
1875 }
1876
1877 sata_pmp_error_handler(ap);
1878
1879 if (!ata_dev_enabled(ap->link.device))
1880 ahci_stop_engine(ap);
1881 }
1882
1883 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1884 {
1885 struct ata_port *ap = qc->ap;
1886
1887 /* make DMA engine forget about the failed command */
1888 if (qc->flags & ATA_QCFLAG_FAILED)
1889 ahci_kick_engine(ap);
1890 }
1891
1892 static void ahci_enable_fbs(struct ata_port *ap)
1893 {
1894 struct ahci_port_priv *pp = ap->private_data;
1895 void __iomem *port_mmio = ahci_port_base(ap);
1896 u32 fbs;
1897 int rc;
1898
1899 if (!pp->fbs_supported)
1900 return;
1901
1902 fbs = readl(port_mmio + PORT_FBS);
1903 if (fbs & PORT_FBS_EN) {
1904 pp->fbs_enabled = true;
1905 pp->fbs_last_dev = -1; /* initialization */
1906 return;
1907 }
1908
1909 rc = ahci_stop_engine(ap);
1910 if (rc)
1911 return;
1912
1913 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
1914 fbs = readl(port_mmio + PORT_FBS);
1915 if (fbs & PORT_FBS_EN) {
1916 dev_printk(KERN_INFO, ap->host->dev, "FBS is enabled.\n");
1917 pp->fbs_enabled = true;
1918 pp->fbs_last_dev = -1; /* initialization */
1919 } else
1920 dev_printk(KERN_ERR, ap->host->dev, "Failed to enable FBS\n");
1921
1922 ahci_start_engine(ap);
1923 }
1924
1925 static void ahci_disable_fbs(struct ata_port *ap)
1926 {
1927 struct ahci_port_priv *pp = ap->private_data;
1928 void __iomem *port_mmio = ahci_port_base(ap);
1929 u32 fbs;
1930 int rc;
1931
1932 if (!pp->fbs_supported)
1933 return;
1934
1935 fbs = readl(port_mmio + PORT_FBS);
1936 if ((fbs & PORT_FBS_EN) == 0) {
1937 pp->fbs_enabled = false;
1938 return;
1939 }
1940
1941 rc = ahci_stop_engine(ap);
1942 if (rc)
1943 return;
1944
1945 writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
1946 fbs = readl(port_mmio + PORT_FBS);
1947 if (fbs & PORT_FBS_EN)
1948 dev_printk(KERN_ERR, ap->host->dev, "Failed to disable FBS\n");
1949 else {
1950 dev_printk(KERN_INFO, ap->host->dev, "FBS is disabled.\n");
1951 pp->fbs_enabled = false;
1952 }
1953
1954 ahci_start_engine(ap);
1955 }
1956
1957 static void ahci_pmp_attach(struct ata_port *ap)
1958 {
1959 void __iomem *port_mmio = ahci_port_base(ap);
1960 struct ahci_port_priv *pp = ap->private_data;
1961 u32 cmd;
1962
1963 cmd = readl(port_mmio + PORT_CMD);
1964 cmd |= PORT_CMD_PMP;
1965 writel(cmd, port_mmio + PORT_CMD);
1966
1967 ahci_enable_fbs(ap);
1968
1969 pp->intr_mask |= PORT_IRQ_BAD_PMP;
1970 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1971 }
1972
1973 static void ahci_pmp_detach(struct ata_port *ap)
1974 {
1975 void __iomem *port_mmio = ahci_port_base(ap);
1976 struct ahci_port_priv *pp = ap->private_data;
1977 u32 cmd;
1978
1979 ahci_disable_fbs(ap);
1980
1981 cmd = readl(port_mmio + PORT_CMD);
1982 cmd &= ~PORT_CMD_PMP;
1983 writel(cmd, port_mmio + PORT_CMD);
1984
1985 pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
1986 writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1987 }
1988
1989 static int ahci_port_resume(struct ata_port *ap)
1990 {
1991 ahci_power_up(ap);
1992 ahci_start_port(ap);
1993
1994 if (sata_pmp_attached(ap))
1995 ahci_pmp_attach(ap);
1996 else
1997 ahci_pmp_detach(ap);
1998
1999 return 0;
2000 }
2001
2002 #ifdef CONFIG_PM
2003 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2004 {
2005 const char *emsg = NULL;
2006 int rc;
2007
2008 rc = ahci_deinit_port(ap, &emsg);
2009 if (rc == 0)
2010 ahci_power_down(ap);
2011 else {
2012 ata_port_printk(ap, KERN_ERR, "%s (%d)\n", emsg, rc);
2013 ahci_start_port(ap);
2014 }
2015
2016 return rc;
2017 }
2018 #endif
2019
2020 static int ahci_port_start(struct ata_port *ap)
2021 {
2022 struct ahci_host_priv *hpriv = ap->host->private_data;
2023 struct device *dev = ap->host->dev;
2024 struct ahci_port_priv *pp;
2025 void *mem;
2026 dma_addr_t mem_dma;
2027 size_t dma_sz, rx_fis_sz;
2028
2029 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2030 if (!pp)
2031 return -ENOMEM;
2032
2033 /* check FBS capability */
2034 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2035 void __iomem *port_mmio = ahci_port_base(ap);
2036 u32 cmd = readl(port_mmio + PORT_CMD);
2037 if (cmd & PORT_CMD_FBSCP)
2038 pp->fbs_supported = true;
2039 else
2040 dev_printk(KERN_WARNING, dev,
2041 "The port is not capable of FBS\n");
2042 }
2043
2044 if (pp->fbs_supported) {
2045 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2046 rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2047 } else {
2048 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2049 rx_fis_sz = AHCI_RX_FIS_SZ;
2050 }
2051
2052 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2053 if (!mem)
2054 return -ENOMEM;
2055 memset(mem, 0, dma_sz);
2056
2057 /*
2058 * First item in chunk of DMA memory: 32-slot command table,
2059 * 32 bytes each in size
2060 */
2061 pp->cmd_slot = mem;
2062 pp->cmd_slot_dma = mem_dma;
2063
2064 mem += AHCI_CMD_SLOT_SZ;
2065 mem_dma += AHCI_CMD_SLOT_SZ;
2066
2067 /*
2068 * Second item: Received-FIS area
2069 */
2070 pp->rx_fis = mem;
2071 pp->rx_fis_dma = mem_dma;
2072
2073 mem += rx_fis_sz;
2074 mem_dma += rx_fis_sz;
2075
2076 /*
2077 * Third item: data area for storing a single command
2078 * and its scatter-gather table
2079 */
2080 pp->cmd_tbl = mem;
2081 pp->cmd_tbl_dma = mem_dma;
2082
2083 /*
2084 * Save off initial list of interrupts to be enabled.
2085 * This could be changed later
2086 */
2087 pp->intr_mask = DEF_PORT_IRQ;
2088
2089 ap->private_data = pp;
2090
2091 /* engage engines, captain */
2092 return ahci_port_resume(ap);
2093 }
2094
2095 static void ahci_port_stop(struct ata_port *ap)
2096 {
2097 const char *emsg = NULL;
2098 int rc;
2099
2100 /* de-initialize port */
2101 rc = ahci_deinit_port(ap, &emsg);
2102 if (rc)
2103 ata_port_printk(ap, KERN_WARNING, "%s (%d)\n", emsg, rc);
2104 }
2105
2106 void ahci_print_info(struct ata_host *host, const char *scc_s)
2107 {
2108 struct ahci_host_priv *hpriv = host->private_data;
2109 void __iomem *mmio = hpriv->mmio;
2110 u32 vers, cap, cap2, impl, speed;
2111 const char *speed_s;
2112
2113 vers = readl(mmio + HOST_VERSION);
2114 cap = hpriv->cap;
2115 cap2 = hpriv->cap2;
2116 impl = hpriv->port_map;
2117
2118 speed = (cap >> 20) & 0xf;
2119 if (speed == 1)
2120 speed_s = "1.5";
2121 else if (speed == 2)
2122 speed_s = "3";
2123 else if (speed == 3)
2124 speed_s = "6";
2125 else
2126 speed_s = "?";
2127
2128 dev_info(host->dev,
2129 "AHCI %02x%02x.%02x%02x "
2130 "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2131 ,
2132
2133 (vers >> 24) & 0xff,
2134 (vers >> 16) & 0xff,
2135 (vers >> 8) & 0xff,
2136 vers & 0xff,
2137
2138 ((cap >> 8) & 0x1f) + 1,
2139 (cap & 0x1f) + 1,
2140 speed_s,
2141 impl,
2142 scc_s);
2143
2144 dev_info(host->dev,
2145 "flags: "
2146 "%s%s%s%s%s%s%s"
2147 "%s%s%s%s%s%s%s"
2148 "%s%s%s%s%s%s\n"
2149 ,
2150
2151 cap & HOST_CAP_64 ? "64bit " : "",
2152 cap & HOST_CAP_NCQ ? "ncq " : "",
2153 cap & HOST_CAP_SNTF ? "sntf " : "",
2154 cap & HOST_CAP_MPS ? "ilck " : "",
2155 cap & HOST_CAP_SSS ? "stag " : "",
2156 cap & HOST_CAP_ALPM ? "pm " : "",
2157 cap & HOST_CAP_LED ? "led " : "",
2158 cap & HOST_CAP_CLO ? "clo " : "",
2159 cap & HOST_CAP_ONLY ? "only " : "",
2160 cap & HOST_CAP_PMP ? "pmp " : "",
2161 cap & HOST_CAP_FBS ? "fbs " : "",
2162 cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2163 cap & HOST_CAP_SSC ? "slum " : "",
2164 cap & HOST_CAP_PART ? "part " : "",
2165 cap & HOST_CAP_CCC ? "ccc " : "",
2166 cap & HOST_CAP_EMS ? "ems " : "",
2167 cap & HOST_CAP_SXS ? "sxs " : "",
2168 cap2 & HOST_CAP2_APST ? "apst " : "",
2169 cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2170 cap2 & HOST_CAP2_BOH ? "boh " : ""
2171 );
2172 }
2173 EXPORT_SYMBOL_GPL(ahci_print_info);
2174
2175 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2176 struct ata_port_info *pi)
2177 {
2178 u8 messages;
2179 void __iomem *mmio = hpriv->mmio;
2180 u32 em_loc = readl(mmio + HOST_EM_LOC);
2181 u32 em_ctl = readl(mmio + HOST_EM_CTL);
2182
2183 if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2184 return;
2185
2186 messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2187
2188 if (messages) {
2189 /* store em_loc */
2190 hpriv->em_loc = ((em_loc >> 16) * 4);
2191 hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2192 hpriv->em_msg_type = messages;
2193 pi->flags |= ATA_FLAG_EM;
2194 if (!(em_ctl & EM_CTL_ALHD))
2195 pi->flags |= ATA_FLAG_SW_ACTIVITY;
2196 }
2197 }
2198 EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2199
2200 MODULE_AUTHOR("Jeff Garzik");
2201 MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2202 MODULE_LICENSE("GPL");
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