1 /*
2 * AHCI SATA platform library
3 *
4 * Copyright 2004-2005 Red Hat, Inc.
5 * Jeff Garzik <jgarzik@pobox.com>
6 * Copyright 2010 MontaVista Software, LLC.
7 * Anton Vorontsov <avorontsov@ru.mvista.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 */
14
15 #include <linux/clk.h>
16 #include <linux/kernel.h>
17 #include <linux/gfp.h>
18 #include <linux/module.h>
19 #include <linux/pm.h>
20 #include <linux/interrupt.h>
21 #include <linux/device.h>
22 #include <linux/platform_device.h>
23 #include <linux/libata.h>
24 #include <linux/ahci_platform.h>
25 #include <linux/phy/phy.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of_platform.h>
28 #include <linux/reset.h>
29 #include "ahci.h"
30
31 static void ahci_host_stop(struct ata_host *host);
32
33 struct ata_port_operations ahci_platform_ops = {
34 .inherits = &ahci_ops,
35 .host_stop = ahci_host_stop,
36 };
37 EXPORT_SYMBOL_GPL(ahci_platform_ops);
38
39 /**
40 * ahci_platform_enable_phys - Enable PHYs
41 * @hpriv: host private area to store config values
42 *
43 * This function enables all the PHYs found in hpriv->phys, if any.
44 * If a PHY fails to be enabled, it disables all the PHYs already
45 * enabled in reverse order and returns an error.
46 *
47 * RETURNS:
48 * 0 on success otherwise a negative error code
49 */
ahci_platform_enable_phys(struct ahci_host_priv * hpriv)50 static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)
51 {
52 int rc, i;
53
54 for (i = 0; i < hpriv->nports; i++) {
55 rc = phy_init(hpriv->phys[i]);
56 if (rc)
57 goto disable_phys;
58
59 rc = phy_power_on(hpriv->phys[i]);
60 if (rc) {
61 phy_exit(hpriv->phys[i]);
62 goto disable_phys;
63 }
64 }
65
66 return 0;
67
68 disable_phys:
69 while (--i >= 0) {
70 phy_power_off(hpriv->phys[i]);
71 phy_exit(hpriv->phys[i]);
72 }
73 return rc;
74 }
75
76 /**
77 * ahci_platform_disable_phys - Disable PHYs
78 * @hpriv: host private area to store config values
79 *
80 * This function disables all PHYs found in hpriv->phys.
81 */
ahci_platform_disable_phys(struct ahci_host_priv * hpriv)82 static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
83 {
84 int i;
85
86 for (i = 0; i < hpriv->nports; i++) {
87 phy_power_off(hpriv->phys[i]);
88 phy_exit(hpriv->phys[i]);
89 }
90 }
91
92 /**
93 * ahci_platform_enable_clks - Enable platform clocks
94 * @hpriv: host private area to store config values
95 *
96 * This function enables all the clks found in hpriv->clks, starting at
97 * index 0. If any clk fails to enable it disables all the clks already
98 * enabled in reverse order, and then returns an error.
99 *
100 * RETURNS:
101 * 0 on success otherwise a negative error code
102 */
ahci_platform_enable_clks(struct ahci_host_priv * hpriv)103 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
104 {
105 int c, rc;
106
107 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {
108 rc = clk_prepare_enable(hpriv->clks[c]);
109 if (rc)
110 goto disable_unprepare_clk;
111 }
112 return 0;
113
114 disable_unprepare_clk:
115 while (--c >= 0)
116 clk_disable_unprepare(hpriv->clks[c]);
117 return rc;
118 }
119 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
120
121 /**
122 * ahci_platform_disable_clks - Disable platform clocks
123 * @hpriv: host private area to store config values
124 *
125 * This function disables all the clks found in hpriv->clks, in reverse
126 * order of ahci_platform_enable_clks (starting at the end of the array).
127 */
ahci_platform_disable_clks(struct ahci_host_priv * hpriv)128 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
129 {
130 int c;
131
132 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
133 if (hpriv->clks[c])
134 clk_disable_unprepare(hpriv->clks[c]);
135 }
136 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
137
138 /**
139 * ahci_platform_enable_regulators - Enable regulators
140 * @hpriv: host private area to store config values
141 *
142 * This function enables all the regulators found in
143 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it
144 * disables all the regulators already enabled in reverse order and
145 * returns an error.
146 *
147 * RETURNS:
148 * 0 on success otherwise a negative error code
149 */
ahci_platform_enable_regulators(struct ahci_host_priv * hpriv)150 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
151 {
152 int rc, i;
153
154 for (i = 0; i < hpriv->nports; i++) {
155 if (!hpriv->target_pwrs[i])
156 continue;
157
158 rc = regulator_enable(hpriv->target_pwrs[i]);
159 if (rc)
160 goto disable_target_pwrs;
161 }
162
163 return 0;
164
165 disable_target_pwrs:
166 while (--i >= 0)
167 if (hpriv->target_pwrs[i])
168 regulator_disable(hpriv->target_pwrs[i]);
169
170 return rc;
171 }
172 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
173
174 /**
175 * ahci_platform_disable_regulators - Disable regulators
176 * @hpriv: host private area to store config values
177 *
178 * This function disables all regulators found in hpriv->target_pwrs.
179 */
ahci_platform_disable_regulators(struct ahci_host_priv * hpriv)180 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
181 {
182 int i;
183
184 for (i = 0; i < hpriv->nports; i++) {
185 if (!hpriv->target_pwrs[i])
186 continue;
187 regulator_disable(hpriv->target_pwrs[i]);
188 }
189 }
190 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
191 /**
192 * ahci_platform_enable_resources - Enable platform resources
193 * @hpriv: host private area to store config values
194 *
195 * This function enables all ahci_platform managed resources in the
196 * following order:
197 * 1) Regulator
198 * 2) Clocks (through ahci_platform_enable_clks)
199 * 3) Resets
200 * 4) Phys
201 *
202 * If resource enabling fails at any point the previous enabled resources
203 * are disabled in reverse order.
204 *
205 * RETURNS:
206 * 0 on success otherwise a negative error code
207 */
ahci_platform_enable_resources(struct ahci_host_priv * hpriv)208 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
209 {
210 int rc;
211
212 rc = ahci_platform_enable_regulators(hpriv);
213 if (rc)
214 return rc;
215
216 rc = ahci_platform_enable_clks(hpriv);
217 if (rc)
218 goto disable_regulator;
219
220 rc = reset_control_deassert(hpriv->rsts);
221 if (rc)
222 goto disable_clks;
223
224 rc = ahci_platform_enable_phys(hpriv);
225 if (rc)
226 goto disable_resets;
227
228 return 0;
229
230 disable_resets:
231 reset_control_assert(hpriv->rsts);
232
233 disable_clks:
234 ahci_platform_disable_clks(hpriv);
235
236 disable_regulator:
237 ahci_platform_disable_regulators(hpriv);
238
239 return rc;
240 }
241 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
242
243 /**
244 * ahci_platform_disable_resources - Disable platform resources
245 * @hpriv: host private area to store config values
246 *
247 * This function disables all ahci_platform managed resources in the
248 * following order:
249 * 1) Phys
250 * 2) Resets
251 * 3) Clocks (through ahci_platform_disable_clks)
252 * 4) Regulator
253 */
ahci_platform_disable_resources(struct ahci_host_priv * hpriv)254 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
255 {
256 ahci_platform_disable_phys(hpriv);
257
258 reset_control_assert(hpriv->rsts);
259
260 ahci_platform_disable_clks(hpriv);
261
262 ahci_platform_disable_regulators(hpriv);
263 }
264 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
265
ahci_platform_put_resources(struct device * dev,void * res)266 static void ahci_platform_put_resources(struct device *dev, void *res)
267 {
268 struct ahci_host_priv *hpriv = res;
269 int c;
270
271 if (hpriv->got_runtime_pm) {
272 pm_runtime_put_sync(dev);
273 pm_runtime_disable(dev);
274 }
275
276 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
277 clk_put(hpriv->clks[c]);
278 /*
279 * The regulators are tied to child node device and not to the
280 * SATA device itself. So we can't use devm for automatically
281 * releasing them. We have to do it manually here.
282 */
283 for (c = 0; c < hpriv->nports; c++)
284 if (hpriv->target_pwrs && hpriv->target_pwrs[c])
285 regulator_put(hpriv->target_pwrs[c]);
286
287 kfree(hpriv->target_pwrs);
288 }
289
ahci_platform_get_phy(struct ahci_host_priv * hpriv,u32 port,struct device * dev,struct device_node * node)290 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
291 struct device *dev, struct device_node *node)
292 {
293 int rc;
294
295 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
296
297 if (!IS_ERR(hpriv->phys[port]))
298 return 0;
299
300 rc = PTR_ERR(hpriv->phys[port]);
301 switch (rc) {
302 case -ENOSYS:
303 /* No PHY support. Check if PHY is required. */
304 if (of_find_property(node, "phys", NULL)) {
305 dev_err(dev,
306 "couldn't get PHY in node %s: ENOSYS\n",
307 node->name);
308 break;
309 }
310 /* fall through */
311 case -ENODEV:
312 /* continue normally */
313 hpriv->phys[port] = NULL;
314 rc = 0;
315 break;
316
317 default:
318 dev_err(dev,
319 "couldn't get PHY in node %s: %d\n",
320 node->name, rc);
321
322 break;
323 }
324
325 return rc;
326 }
327
ahci_platform_get_regulator(struct ahci_host_priv * hpriv,u32 port,struct device * dev)328 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
329 struct device *dev)
330 {
331 struct regulator *target_pwr;
332 int rc = 0;
333
334 target_pwr = regulator_get_optional(dev, "target");
335
336 if (!IS_ERR(target_pwr))
337 hpriv->target_pwrs[port] = target_pwr;
338 else
339 rc = PTR_ERR(target_pwr);
340
341 return rc;
342 }
343
344 /**
345 * ahci_platform_get_resources - Get platform resources
346 * @pdev: platform device to get resources for
347 * @flags: bitmap representing the resource to get
348 *
349 * This function allocates an ahci_host_priv struct, and gets the following
350 * resources, storing a reference to them inside the returned struct:
351 *
352 * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
353 * 2) regulator for controlling the targets power (optional)
354 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
355 * or for non devicetree enabled platforms a single clock
356 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)
357 * 5) phys (optional)
358 *
359 * RETURNS:
360 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
361 */
ahci_platform_get_resources(struct platform_device * pdev,unsigned int flags)362 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
363 unsigned int flags)
364 {
365 struct device *dev = &pdev->dev;
366 struct ahci_host_priv *hpriv;
367 struct clk *clk;
368 struct device_node *child;
369 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes;
370 u32 mask_port_map = 0;
371
372 if (!devres_open_group(dev, NULL, GFP_KERNEL))
373 return ERR_PTR(-ENOMEM);
374
375 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
376 GFP_KERNEL);
377 if (!hpriv)
378 goto err_out;
379
380 devres_add(dev, hpriv);
381
382 hpriv->mmio = devm_ioremap_resource(dev,
383 platform_get_resource(pdev, IORESOURCE_MEM, 0));
384 if (IS_ERR(hpriv->mmio)) {
385 dev_err(dev, "no mmio space\n");
386 rc = PTR_ERR(hpriv->mmio);
387 goto err_out;
388 }
389
390 for (i = 0; i < AHCI_MAX_CLKS; i++) {
391 /*
392 * For now we must use clk_get(dev, NULL) for the first clock,
393 * because some platforms (da850, spear13xx) are not yet
394 * converted to use devicetree for clocks. For new platforms
395 * this is equivalent to of_clk_get(dev->of_node, 0).
396 */
397 if (i == 0)
398 clk = clk_get(dev, NULL);
399 else
400 clk = of_clk_get(dev->of_node, i);
401
402 if (IS_ERR(clk)) {
403 rc = PTR_ERR(clk);
404 if (rc == -EPROBE_DEFER)
405 goto err_out;
406 break;
407 }
408 hpriv->clks[i] = clk;
409 }
410
411 if (flags & AHCI_PLATFORM_GET_RESETS) {
412 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
413 if (IS_ERR(hpriv->rsts)) {
414 rc = PTR_ERR(hpriv->rsts);
415 goto err_out;
416 }
417 }
418
419 hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
420
421 /*
422 * If no sub-node was found, we still need to set nports to
423 * one in order to be able to use the
424 * ahci_platform_[en|dis]able_[phys|regulators] functions.
425 */
426 if (!child_nodes)
427 hpriv->nports = 1;
428
429 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);
430 if (!hpriv->phys) {
431 rc = -ENOMEM;
432 goto err_out;
433 }
434 /*
435 * We cannot use devm_ here, since ahci_platform_put_resources() uses
436 * target_pwrs after devm_ have freed memory
437 */
438 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL);
439 if (!hpriv->target_pwrs) {
440 rc = -ENOMEM;
441 goto err_out;
442 }
443
444 if (child_nodes) {
445 for_each_child_of_node(dev->of_node, child) {
446 u32 port;
447 struct platform_device *port_dev __maybe_unused;
448
449 if (!of_device_is_available(child))
450 continue;
451
452 if (of_property_read_u32(child, "reg", &port)) {
453 rc = -EINVAL;
454 goto err_out;
455 }
456
457 if (port >= hpriv->nports) {
458 dev_warn(dev, "invalid port number %d\n", port);
459 continue;
460 }
461 mask_port_map |= BIT(port);
462
463 #ifdef CONFIG_OF_ADDRESS
464 of_platform_device_create(child, NULL, NULL);
465
466 port_dev = of_find_device_by_node(child);
467
468 if (port_dev) {
469 rc = ahci_platform_get_regulator(hpriv, port,
470 &port_dev->dev);
471 if (rc == -EPROBE_DEFER)
472 goto err_out;
473 }
474 #endif
475
476 rc = ahci_platform_get_phy(hpriv, port, dev, child);
477 if (rc)
478 goto err_out;
479
480 enabled_ports++;
481 }
482 if (!enabled_ports) {
483 dev_warn(dev, "No port enabled\n");
484 rc = -ENODEV;
485 goto err_out;
486 }
487
488 if (!hpriv->mask_port_map)
489 hpriv->mask_port_map = mask_port_map;
490 } else {
491 /*
492 * If no sub-node was found, keep this for device tree
493 * compatibility
494 */
495 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);
496 if (rc)
497 goto err_out;
498
499 rc = ahci_platform_get_regulator(hpriv, 0, dev);
500 if (rc == -EPROBE_DEFER)
501 goto err_out;
502 }
503 pm_runtime_enable(dev);
504 pm_runtime_get_sync(dev);
505 hpriv->got_runtime_pm = true;
506
507 devres_remove_group(dev, NULL);
508 return hpriv;
509
510 err_out:
511 devres_release_group(dev, NULL);
512 return ERR_PTR(rc);
513 }
514 EXPORT_SYMBOL_GPL(ahci_platform_get_resources);
515
516 /**
517 * ahci_platform_init_host - Bring up an ahci-platform host
518 * @pdev: platform device pointer for the host
519 * @hpriv: ahci-host private data for the host
520 * @pi_template: template for the ata_port_info to use
521 * @sht: scsi_host_template to use when registering
522 *
523 * This function does all the usual steps needed to bring up an
524 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
525 * must be initialized / enabled before calling this.
526 *
527 * RETURNS:
528 * 0 on success otherwise a negative error code
529 */
ahci_platform_init_host(struct platform_device * pdev,struct ahci_host_priv * hpriv,const struct ata_port_info * pi_template,struct scsi_host_template * sht)530 int ahci_platform_init_host(struct platform_device *pdev,
531 struct ahci_host_priv *hpriv,
532 const struct ata_port_info *pi_template,
533 struct scsi_host_template *sht)
534 {
535 struct device *dev = &pdev->dev;
536 struct ata_port_info pi = *pi_template;
537 const struct ata_port_info *ppi[] = { &pi, NULL };
538 struct ata_host *host;
539 int i, irq, n_ports, rc;
540
541 irq = platform_get_irq(pdev, 0);
542 if (irq <= 0) {
543 if (irq != -EPROBE_DEFER)
544 dev_err(dev, "no irq\n");
545 return irq;
546 }
547
548 hpriv->irq = irq;
549
550 /* prepare host */
551 pi.private_data = (void *)(unsigned long)hpriv->flags;
552
553 ahci_save_initial_config(dev, hpriv);
554
555 if (hpriv->cap & HOST_CAP_NCQ)
556 pi.flags |= ATA_FLAG_NCQ;
557
558 if (hpriv->cap & HOST_CAP_PMP)
559 pi.flags |= ATA_FLAG_PMP;
560
561 ahci_set_em_messages(hpriv, &pi);
562
563 /* CAP.NP sometimes indicate the index of the last enabled
564 * port, at other times, that of the last possible port, so
565 * determining the maximum port number requires looking at
566 * both CAP.NP and port_map.
567 */
568 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
569
570 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
571 if (!host)
572 return -ENOMEM;
573
574 host->private_data = hpriv;
575
576 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
577 host->flags |= ATA_HOST_PARALLEL_SCAN;
578 else
579 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
580
581 if (pi.flags & ATA_FLAG_EM)
582 ahci_reset_em(host);
583
584 for (i = 0; i < host->n_ports; i++) {
585 struct ata_port *ap = host->ports[i];
586
587 ata_port_desc(ap, "mmio %pR",
588 platform_get_resource(pdev, IORESOURCE_MEM, 0));
589 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
590
591 /* set enclosure management message type */
592 if (ap->flags & ATA_FLAG_EM)
593 ap->em_message_type = hpriv->em_msg_type;
594
595 /* disabled/not-implemented port */
596 if (!(hpriv->port_map & (1 << i)))
597 ap->ops = &ata_dummy_port_ops;
598 }
599
600 if (hpriv->cap & HOST_CAP_64) {
601 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
602 if (rc) {
603 rc = dma_coerce_mask_and_coherent(dev,
604 DMA_BIT_MASK(32));
605 if (rc) {
606 dev_err(dev, "Failed to enable 64-bit DMA.\n");
607 return rc;
608 }
609 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
610 }
611 }
612
613 rc = ahci_reset_controller(host);
614 if (rc)
615 return rc;
616
617 ahci_init_controller(host);
618 ahci_print_info(host, "platform");
619
620 return ahci_host_activate(host, sht);
621 }
622 EXPORT_SYMBOL_GPL(ahci_platform_init_host);
623
ahci_host_stop(struct ata_host * host)624 static void ahci_host_stop(struct ata_host *host)
625 {
626 struct ahci_host_priv *hpriv = host->private_data;
627
628 ahci_platform_disable_resources(hpriv);
629 }
630
631 /**
632 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports
633 * @pdev: platform device pointer for the host
634 *
635 * This function is called during system shutdown and performs the minimal
636 * deconfiguration required to ensure that an ahci_platform host cannot
637 * corrupt or otherwise interfere with a new kernel being started with kexec.
638 */
ahci_platform_shutdown(struct platform_device * pdev)639 void ahci_platform_shutdown(struct platform_device *pdev)
640 {
641 struct ata_host *host = platform_get_drvdata(pdev);
642 struct ahci_host_priv *hpriv = host->private_data;
643 void __iomem *mmio = hpriv->mmio;
644 int i;
645
646 for (i = 0; i < host->n_ports; i++) {
647 struct ata_port *ap = host->ports[i];
648
649 /* Disable port interrupts */
650 if (ap->ops->freeze)
651 ap->ops->freeze(ap);
652
653 /* Stop the port DMA engines */
654 if (ap->ops->port_stop)
655 ap->ops->port_stop(ap);
656 }
657
658 /* Disable and clear host interrupts */
659 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);
660 readl(mmio + HOST_CTL); /* flush */
661 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);
662 }
663 EXPORT_SYMBOL_GPL(ahci_platform_shutdown);
664
665 #ifdef CONFIG_PM_SLEEP
666 /**
667 * ahci_platform_suspend_host - Suspend an ahci-platform host
668 * @dev: device pointer for the host
669 *
670 * This function does all the usual steps needed to suspend an
671 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
672 * must be disabled after calling this.
673 *
674 * RETURNS:
675 * 0 on success otherwise a negative error code
676 */
ahci_platform_suspend_host(struct device * dev)677 int ahci_platform_suspend_host(struct device *dev)
678 {
679 struct ata_host *host = dev_get_drvdata(dev);
680 struct ahci_host_priv *hpriv = host->private_data;
681 void __iomem *mmio = hpriv->mmio;
682 u32 ctl;
683
684 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
685 dev_err(dev, "firmware update required for suspend/resume\n");
686 return -EIO;
687 }
688
689 /*
690 * AHCI spec rev1.1 section 8.3.3:
691 * Software must disable interrupts prior to requesting a
692 * transition of the HBA to D3 state.
693 */
694 ctl = readl(mmio + HOST_CTL);
695 ctl &= ~HOST_IRQ_EN;
696 writel(ctl, mmio + HOST_CTL);
697 readl(mmio + HOST_CTL); /* flush */
698
699 return ata_host_suspend(host, PMSG_SUSPEND);
700 }
701 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
702
703 /**
704 * ahci_platform_resume_host - Resume an ahci-platform host
705 * @dev: device pointer for the host
706 *
707 * This function does all the usual steps needed to resume an ahci-platform
708 * host, note any necessary resources (ie clks, phys, etc.) must be
709 * initialized / enabled before calling this.
710 *
711 * RETURNS:
712 * 0 on success otherwise a negative error code
713 */
ahci_platform_resume_host(struct device * dev)714 int ahci_platform_resume_host(struct device *dev)
715 {
716 struct ata_host *host = dev_get_drvdata(dev);
717 int rc;
718
719 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
720 rc = ahci_reset_controller(host);
721 if (rc)
722 return rc;
723
724 ahci_init_controller(host);
725 }
726
727 ata_host_resume(host);
728
729 return 0;
730 }
731 EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
732
733 /**
734 * ahci_platform_suspend - Suspend an ahci-platform device
735 * @dev: the platform device to suspend
736 *
737 * This function suspends the host associated with the device, followed by
738 * disabling all the resources of the device.
739 *
740 * RETURNS:
741 * 0 on success otherwise a negative error code
742 */
ahci_platform_suspend(struct device * dev)743 int ahci_platform_suspend(struct device *dev)
744 {
745 struct ata_host *host = dev_get_drvdata(dev);
746 struct ahci_host_priv *hpriv = host->private_data;
747 int rc;
748
749 rc = ahci_platform_suspend_host(dev);
750 if (rc)
751 return rc;
752
753 ahci_platform_disable_resources(hpriv);
754
755 return 0;
756 }
757 EXPORT_SYMBOL_GPL(ahci_platform_suspend);
758
759 /**
760 * ahci_platform_resume - Resume an ahci-platform device
761 * @dev: the platform device to resume
762 *
763 * This function enables all the resources of the device followed by
764 * resuming the host associated with the device.
765 *
766 * RETURNS:
767 * 0 on success otherwise a negative error code
768 */
ahci_platform_resume(struct device * dev)769 int ahci_platform_resume(struct device *dev)
770 {
771 struct ata_host *host = dev_get_drvdata(dev);
772 struct ahci_host_priv *hpriv = host->private_data;
773 int rc;
774
775 rc = ahci_platform_enable_resources(hpriv);
776 if (rc)
777 return rc;
778
779 rc = ahci_platform_resume_host(dev);
780 if (rc)
781 goto disable_resources;
782
783 /* We resumed so update PM runtime state */
784 pm_runtime_disable(dev);
785 pm_runtime_set_active(dev);
786 pm_runtime_enable(dev);
787
788 return 0;
789
790 disable_resources:
791 ahci_platform_disable_resources(hpriv);
792
793 return rc;
794 }
795 EXPORT_SYMBOL_GPL(ahci_platform_resume);
796 #endif
797
798 MODULE_DESCRIPTION("AHCI SATA platform library");
799 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
800 MODULE_LICENSE("GPL");
801
