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
31static void ahci_host_stop(struct ata_host *host);
32
33struct ata_port_operations ahci_platform_ops = {
34 .inherits = &ahci_ops,
35 .host_stop = ahci_host_stop,
36};
37EXPORT_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 */
50static 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_set_mode(hpriv->phys[i], PHY_MODE_SATA);
60 if (rc) {
61 phy_exit(hpriv->phys[i]);
62 goto disable_phys;
63 }
64
65 rc = phy_power_on(hpriv->phys[i]);
66 if (rc) {
67 phy_exit(hpriv->phys[i]);
68 goto disable_phys;
69 }
70 }
71
72 return 0;
73
74disable_phys:
75 while (--i >= 0) {
76 phy_power_off(hpriv->phys[i]);
77 phy_exit(hpriv->phys[i]);
78 }
79 return rc;
80}
81
82/**
83 * ahci_platform_disable_phys - Disable PHYs
84 * @hpriv: host private area to store config values
85 *
86 * This function disables all PHYs found in hpriv->phys.
87 */
88static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
89{
90 int i;
91
92 for (i = 0; i < hpriv->nports; i++) {
93 phy_power_off(hpriv->phys[i]);
94 phy_exit(hpriv->phys[i]);
95 }
96}
97
98/**
99 * ahci_platform_enable_clks - Enable platform clocks
100 * @hpriv: host private area to store config values
101 *
102 * This function enables all the clks found in hpriv->clks, starting at
103 * index 0. If any clk fails to enable it disables all the clks already
104 * enabled in reverse order, and then returns an error.
105 *
106 * RETURNS:
107 * 0 on success otherwise a negative error code
108 */
109int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
110{
111 int c, rc;
112
113 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {
114 rc = clk_prepare_enable(hpriv->clks[c]);
115 if (rc)
116 goto disable_unprepare_clk;
117 }
118 return 0;
119
120disable_unprepare_clk:
121 while (--c >= 0)
122 clk_disable_unprepare(hpriv->clks[c]);
123 return rc;
124}
125EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
126
127/**
128 * ahci_platform_disable_clks - Disable platform clocks
129 * @hpriv: host private area to store config values
130 *
131 * This function disables all the clks found in hpriv->clks, in reverse
132 * order of ahci_platform_enable_clks (starting at the end of the array).
133 */
134void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
135{
136 int c;
137
138 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
139 if (hpriv->clks[c])
140 clk_disable_unprepare(hpriv->clks[c]);
141}
142EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
143
144/**
145 * ahci_platform_enable_regulators - Enable regulators
146 * @hpriv: host private area to store config values
147 *
148 * This function enables all the regulators found in controller and
149 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it
150 * disables all the regulators already enabled in reverse order and
151 * returns an error.
152 *
153 * RETURNS:
154 * 0 on success otherwise a negative error code
155 */
156int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
157{
158 int rc, i;
159
160 if (hpriv->ahci_regulator) {
161 rc = regulator_enable(hpriv->ahci_regulator);
162 if (rc)
163 return rc;
164 }
165
166 if (hpriv->phy_regulator) {
167 rc = regulator_enable(hpriv->phy_regulator);
168 if (rc)
169 goto disable_ahci_pwrs;
170 }
171
172 for (i = 0; i < hpriv->nports; i++) {
173 if (!hpriv->target_pwrs[i])
174 continue;
175
176 rc = regulator_enable(hpriv->target_pwrs[i]);
177 if (rc)
178 goto disable_target_pwrs;
179 }
180
181 return 0;
182
183disable_target_pwrs:
184 while (--i >= 0)
185 if (hpriv->target_pwrs[i])
186 regulator_disable(hpriv->target_pwrs[i]);
187
188 if (hpriv->phy_regulator)
189 regulator_disable(hpriv->phy_regulator);
190disable_ahci_pwrs:
191 if (hpriv->ahci_regulator)
192 regulator_disable(hpriv->ahci_regulator);
193 return rc;
194}
195EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
196
197/**
198 * ahci_platform_disable_regulators - Disable regulators
199 * @hpriv: host private area to store config values
200 *
201 * This function disables all regulators found in hpriv->target_pwrs and
202 * AHCI controller.
203 */
204void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
205{
206 int i;
207
208 for (i = 0; i < hpriv->nports; i++) {
209 if (!hpriv->target_pwrs[i])
210 continue;
211 regulator_disable(hpriv->target_pwrs[i]);
212 }
213
214 if (hpriv->ahci_regulator)
215 regulator_disable(hpriv->ahci_regulator);
216 if (hpriv->phy_regulator)
217 regulator_disable(hpriv->phy_regulator);
218}
219EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
220/**
221 * ahci_platform_enable_resources - Enable platform resources
222 * @hpriv: host private area to store config values
223 *
224 * This function enables all ahci_platform managed resources in the
225 * following order:
226 * 1) Regulator
227 * 2) Clocks (through ahci_platform_enable_clks)
228 * 3) Resets
229 * 4) Phys
230 *
231 * If resource enabling fails at any point the previous enabled resources
232 * are disabled in reverse order.
233 *
234 * RETURNS:
235 * 0 on success otherwise a negative error code
236 */
237int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
238{
239 int rc;
240
241 rc = ahci_platform_enable_regulators(hpriv);
242 if (rc)
243 return rc;
244
245 rc = ahci_platform_enable_clks(hpriv);
246 if (rc)
247 goto disable_regulator;
248
249 rc = reset_control_deassert(hpriv->rsts);
250 if (rc)
251 goto disable_clks;
252
253 rc = ahci_platform_enable_phys(hpriv);
254 if (rc)
255 goto disable_resets;
256
257 return 0;
258
259disable_resets:
260 reset_control_assert(hpriv->rsts);
261
262disable_clks:
263 ahci_platform_disable_clks(hpriv);
264
265disable_regulator:
266 ahci_platform_disable_regulators(hpriv);
267
268 return rc;
269}
270EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
271
272/**
273 * ahci_platform_disable_resources - Disable platform resources
274 * @hpriv: host private area to store config values
275 *
276 * This function disables all ahci_platform managed resources in the
277 * following order:
278 * 1) Phys
279 * 2) Resets
280 * 3) Clocks (through ahci_platform_disable_clks)
281 * 4) Regulator
282 */
283void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
284{
285 ahci_platform_disable_phys(hpriv);
286
287 reset_control_assert(hpriv->rsts);
288
289 ahci_platform_disable_clks(hpriv);
290
291 ahci_platform_disable_regulators(hpriv);
292}
293EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
294
295static void ahci_platform_put_resources(struct device *dev, void *res)
296{
297 struct ahci_host_priv *hpriv = res;
298 int c;
299
300 if (hpriv->got_runtime_pm) {
301 pm_runtime_put_sync(dev);
302 pm_runtime_disable(dev);
303 }
304
305 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
306 clk_put(hpriv->clks[c]);
307 /*
308 * The regulators are tied to child node device and not to the
309 * SATA device itself. So we can't use devm for automatically
310 * releasing them. We have to do it manually here.
311 */
312 for (c = 0; c < hpriv->nports; c++)
313 if (hpriv->target_pwrs && hpriv->target_pwrs[c])
314 regulator_put(hpriv->target_pwrs[c]);
315
316 kfree(hpriv->target_pwrs);
317}
318
319static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
320 struct device *dev, struct device_node *node)
321{
322 int rc;
323
324 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
325
326 if (!IS_ERR(hpriv->phys[port]))
327 return 0;
328
329 rc = PTR_ERR(hpriv->phys[port]);
330 switch (rc) {
331 case -ENOSYS:
332 /* No PHY support. Check if PHY is required. */
333 if (of_find_property(node, "phys", NULL)) {
334 dev_err(dev,
335 "couldn't get PHY in node %pOFn: ENOSYS\n",
336 node);
337 break;
338 }
339 /* fall through */
340 case -ENODEV:
341 /* continue normally */
342 hpriv->phys[port] = NULL;
343 rc = 0;
344 break;
345
346 default:
347 dev_err(dev,
348 "couldn't get PHY in node %pOFn: %d\n",
349 node, rc);
350
351 break;
352 }
353
354 return rc;
355}
356
357static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
358 struct device *dev)
359{
360 struct regulator *target_pwr;
361 int rc = 0;
362
363 target_pwr = regulator_get_optional(dev, "target");
364
365 if (!IS_ERR(target_pwr))
366 hpriv->target_pwrs[port] = target_pwr;
367 else
368 rc = PTR_ERR(target_pwr);
369
370 return rc;
371}
372
373/**
374 * ahci_platform_get_resources - Get platform resources
375 * @pdev: platform device to get resources for
376 * @flags: bitmap representing the resource to get
377 *
378 * This function allocates an ahci_host_priv struct, and gets the following
379 * resources, storing a reference to them inside the returned struct:
380 *
381 * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
382 * 2) regulator for controlling the targets power (optional)
383 * regulator for controlling the AHCI controller (optional)
384 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
385 * or for non devicetree enabled platforms a single clock
386 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)
387 * 5) phys (optional)
388 *
389 * RETURNS:
390 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
391 */
392struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
393 unsigned int flags)
394{
395 struct device *dev = &pdev->dev;
396 struct ahci_host_priv *hpriv;
397 struct clk *clk;
398 struct device_node *child;
399 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes;
400 u32 mask_port_map = 0;
401
402 if (!devres_open_group(dev, NULL, GFP_KERNEL))
403 return ERR_PTR(-ENOMEM);
404
405 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
406 GFP_KERNEL);
407 if (!hpriv)
408 goto err_out;
409
410 devres_add(dev, hpriv);
411
412 hpriv->mmio = devm_ioremap_resource(dev,
413 platform_get_resource(pdev, IORESOURCE_MEM, 0));
414 if (IS_ERR(hpriv->mmio)) {
415 dev_err(dev, "no mmio space\n");
416 rc = PTR_ERR(hpriv->mmio);
417 goto err_out;
418 }
419
420 for (i = 0; i < AHCI_MAX_CLKS; i++) {
421 /*
422 * For now we must use clk_get(dev, NULL) for the first clock,
423 * because some platforms (da850, spear13xx) are not yet
424 * converted to use devicetree for clocks. For new platforms
425 * this is equivalent to of_clk_get(dev->of_node, 0).
426 */
427 if (i == 0)
428 clk = clk_get(dev, NULL);
429 else
430 clk = of_clk_get(dev->of_node, i);
431
432 if (IS_ERR(clk)) {
433 rc = PTR_ERR(clk);
434 if (rc == -EPROBE_DEFER)
435 goto err_out;
436 break;
437 }
438 hpriv->clks[i] = clk;
439 }
440
441 hpriv->ahci_regulator = devm_regulator_get_optional(dev, "ahci");
442 if (IS_ERR(hpriv->ahci_regulator)) {
443 rc = PTR_ERR(hpriv->ahci_regulator);
444 if (rc == -EPROBE_DEFER)
445 goto err_out;
446 rc = 0;
447 hpriv->ahci_regulator = NULL;
448 }
449
450 hpriv->phy_regulator = devm_regulator_get_optional(dev, "phy");
451 if (IS_ERR(hpriv->phy_regulator)) {
452 rc = PTR_ERR(hpriv->phy_regulator);
453 if (rc == -EPROBE_DEFER)
454 goto err_out;
455 rc = 0;
456 hpriv->phy_regulator = NULL;
457 }
458
459 if (flags & AHCI_PLATFORM_GET_RESETS) {
460 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
461 if (IS_ERR(hpriv->rsts)) {
462 rc = PTR_ERR(hpriv->rsts);
463 goto err_out;
464 }
465 }
466
467 hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
468
469 /*
470 * If no sub-node was found, we still need to set nports to
471 * one in order to be able to use the
472 * ahci_platform_[en|dis]able_[phys|regulators] functions.
473 */
474 if (!child_nodes)
475 hpriv->nports = 1;
476
477 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);
478 if (!hpriv->phys) {
479 rc = -ENOMEM;
480 goto err_out;
481 }
482 /*
483 * We cannot use devm_ here, since ahci_platform_put_resources() uses
484 * target_pwrs after devm_ have freed memory
485 */
486 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL);
487 if (!hpriv->target_pwrs) {
488 rc = -ENOMEM;
489 goto err_out;
490 }
491
492 if (child_nodes) {
493 for_each_child_of_node(dev->of_node, child) {
494 u32 port;
495 struct platform_device *port_dev __maybe_unused;
496
497 if (!of_device_is_available(child))
498 continue;
499
500 if (of_property_read_u32(child, "reg", &port)) {
501 rc = -EINVAL;
502 goto err_out;
503 }
504
505 if (port >= hpriv->nports) {
506 dev_warn(dev, "invalid port number %d\n", port);
507 continue;
508 }
509 mask_port_map |= BIT(port);
510
511#ifdef CONFIG_OF_ADDRESS
512 of_platform_device_create(child, NULL, NULL);
513
514 port_dev = of_find_device_by_node(child);
515
516 if (port_dev) {
517 rc = ahci_platform_get_regulator(hpriv, port,
518 &port_dev->dev);
519 if (rc == -EPROBE_DEFER)
520 goto err_out;
521 }
522#endif
523
524 rc = ahci_platform_get_phy(hpriv, port, dev, child);
525 if (rc)
526 goto err_out;
527
528 enabled_ports++;
529 }
530 if (!enabled_ports) {
531 dev_warn(dev, "No port enabled\n");
532 rc = -ENODEV;
533 goto err_out;
534 }
535
536 if (!hpriv->mask_port_map)
537 hpriv->mask_port_map = mask_port_map;
538 } else {
539 /*
540 * If no sub-node was found, keep this for device tree
541 * compatibility
542 */
543 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);
544 if (rc)
545 goto err_out;
546
547 rc = ahci_platform_get_regulator(hpriv, 0, dev);
548 if (rc == -EPROBE_DEFER)
549 goto err_out;
550 }
551 pm_runtime_enable(dev);
552 pm_runtime_get_sync(dev);
553 hpriv->got_runtime_pm = true;
554
555 devres_remove_group(dev, NULL);
556 return hpriv;
557
558err_out:
559 devres_release_group(dev, NULL);
560 return ERR_PTR(rc);
561}
562EXPORT_SYMBOL_GPL(ahci_platform_get_resources);
563
564/**
565 * ahci_platform_init_host - Bring up an ahci-platform host
566 * @pdev: platform device pointer for the host
567 * @hpriv: ahci-host private data for the host
568 * @pi_template: template for the ata_port_info to use
569 * @sht: scsi_host_template to use when registering
570 *
571 * This function does all the usual steps needed to bring up an
572 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
573 * must be initialized / enabled before calling this.
574 *
575 * RETURNS:
576 * 0 on success otherwise a negative error code
577 */
578int ahci_platform_init_host(struct platform_device *pdev,
579 struct ahci_host_priv *hpriv,
580 const struct ata_port_info *pi_template,
581 struct scsi_host_template *sht)
582{
583 struct device *dev = &pdev->dev;
584 struct ata_port_info pi = *pi_template;
585 const struct ata_port_info *ppi[] = { &pi, NULL };
586 struct ata_host *host;
587 int i, irq, n_ports, rc;
588
589 irq = platform_get_irq(pdev, 0);
590 if (irq <= 0) {
591 if (irq != -EPROBE_DEFER)
592 dev_err(dev, "no irq\n");
593 return irq;
594 }
595
596 hpriv->irq = irq;
597
598 /* prepare host */
599 pi.private_data = (void *)(unsigned long)hpriv->flags;
600
601 ahci_save_initial_config(dev, hpriv);
602
603 if (hpriv->cap & HOST_CAP_NCQ)
604 pi.flags |= ATA_FLAG_NCQ;
605
606 if (hpriv->cap & HOST_CAP_PMP)
607 pi.flags |= ATA_FLAG_PMP;
608
609 ahci_set_em_messages(hpriv, &pi);
610
611 /* CAP.NP sometimes indicate the index of the last enabled
612 * port, at other times, that of the last possible port, so
613 * determining the maximum port number requires looking at
614 * both CAP.NP and port_map.
615 */
616 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
617
618 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
619 if (!host)
620 return -ENOMEM;
621
622 host->private_data = hpriv;
623
624 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
625 host->flags |= ATA_HOST_PARALLEL_SCAN;
626 else
627 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
628
629 if (pi.flags & ATA_FLAG_EM)
630 ahci_reset_em(host);
631
632 for (i = 0; i < host->n_ports; i++) {
633 struct ata_port *ap = host->ports[i];
634
635 ata_port_desc(ap, "mmio %pR",
636 platform_get_resource(pdev, IORESOURCE_MEM, 0));
637 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
638
639 /* set enclosure management message type */
640 if (ap->flags & ATA_FLAG_EM)
641 ap->em_message_type = hpriv->em_msg_type;
642
643 /* disabled/not-implemented port */
644 if (!(hpriv->port_map & (1 << i)))
645 ap->ops = &ata_dummy_port_ops;
646 }
647
648 if (hpriv->cap & HOST_CAP_64) {
649 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
650 if (rc) {
651 rc = dma_coerce_mask_and_coherent(dev,
652 DMA_BIT_MASK(32));
653 if (rc) {
654 dev_err(dev, "Failed to enable 64-bit DMA.\n");
655 return rc;
656 }
657 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
658 }
659 }
660
661 rc = ahci_reset_controller(host);
662 if (rc)
663 return rc;
664
665 ahci_init_controller(host);
666 ahci_print_info(host, "platform");
667
668 return ahci_host_activate(host, sht);
669}
670EXPORT_SYMBOL_GPL(ahci_platform_init_host);
671
672static void ahci_host_stop(struct ata_host *host)
673{
674 struct ahci_host_priv *hpriv = host->private_data;
675
676 ahci_platform_disable_resources(hpriv);
677}
678
679/**
680 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports
681 * @pdev: platform device pointer for the host
682 *
683 * This function is called during system shutdown and performs the minimal
684 * deconfiguration required to ensure that an ahci_platform host cannot
685 * corrupt or otherwise interfere with a new kernel being started with kexec.
686 */
687void ahci_platform_shutdown(struct platform_device *pdev)
688{
689 struct ata_host *host = platform_get_drvdata(pdev);
690 struct ahci_host_priv *hpriv = host->private_data;
691 void __iomem *mmio = hpriv->mmio;
692 int i;
693
694 for (i = 0; i < host->n_ports; i++) {
695 struct ata_port *ap = host->ports[i];
696
697 /* Disable port interrupts */
698 if (ap->ops->freeze)
699 ap->ops->freeze(ap);
700
701 /* Stop the port DMA engines */
702 if (ap->ops->port_stop)
703 ap->ops->port_stop(ap);
704 }
705
706 /* Disable and clear host interrupts */
707 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);
708 readl(mmio + HOST_CTL); /* flush */
709 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);
710}
711EXPORT_SYMBOL_GPL(ahci_platform_shutdown);
712
713#ifdef CONFIG_PM_SLEEP
714/**
715 * ahci_platform_suspend_host - Suspend an ahci-platform host
716 * @dev: device pointer for the host
717 *
718 * This function does all the usual steps needed to suspend an
719 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
720 * must be disabled after calling this.
721 *
722 * RETURNS:
723 * 0 on success otherwise a negative error code
724 */
725int ahci_platform_suspend_host(struct device *dev)
726{
727 struct ata_host *host = dev_get_drvdata(dev);
728 struct ahci_host_priv *hpriv = host->private_data;
729 void __iomem *mmio = hpriv->mmio;
730 u32 ctl;
731
732 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
733 dev_err(dev, "firmware update required for suspend/resume\n");
734 return -EIO;
735 }
736
737 /*
738 * AHCI spec rev1.1 section 8.3.3:
739 * Software must disable interrupts prior to requesting a
740 * transition of the HBA to D3 state.
741 */
742 ctl = readl(mmio + HOST_CTL);
743 ctl &= ~HOST_IRQ_EN;
744 writel(ctl, mmio + HOST_CTL);
745 readl(mmio + HOST_CTL); /* flush */
746
747 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)
748 ahci_platform_disable_phys(hpriv);
749
750 return ata_host_suspend(host, PMSG_SUSPEND);
751}
752EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
753
754/**
755 * ahci_platform_resume_host - Resume an ahci-platform host
756 * @dev: device pointer for the host
757 *
758 * This function does all the usual steps needed to resume an ahci-platform
759 * host, note any necessary resources (ie clks, phys, etc.) must be
760 * initialized / enabled before calling this.
761 *
762 * RETURNS:
763 * 0 on success otherwise a negative error code
764 */
765int ahci_platform_resume_host(struct device *dev)
766{
767 struct ata_host *host = dev_get_drvdata(dev);
768 struct ahci_host_priv *hpriv = host->private_data;
769 int rc;
770
771 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
772 rc = ahci_reset_controller(host);
773 if (rc)
774 return rc;
775
776 ahci_init_controller(host);
777 }
778
779 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)
780 ahci_platform_enable_phys(hpriv);
781
782 ata_host_resume(host);
783
784 return 0;
785}
786EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
787
788/**
789 * ahci_platform_suspend - Suspend an ahci-platform device
790 * @dev: the platform device to suspend
791 *
792 * This function suspends the host associated with the device, followed by
793 * disabling all the resources of the device.
794 *
795 * RETURNS:
796 * 0 on success otherwise a negative error code
797 */
798int ahci_platform_suspend(struct device *dev)
799{
800 struct ata_host *host = dev_get_drvdata(dev);
801 struct ahci_host_priv *hpriv = host->private_data;
802 int rc;
803
804 rc = ahci_platform_suspend_host(dev);
805 if (rc)
806 return rc;
807
808 ahci_platform_disable_resources(hpriv);
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(ahci_platform_suspend);
813
814/**
815 * ahci_platform_resume - Resume an ahci-platform device
816 * @dev: the platform device to resume
817 *
818 * This function enables all the resources of the device followed by
819 * resuming the host associated with the device.
820 *
821 * RETURNS:
822 * 0 on success otherwise a negative error code
823 */
824int ahci_platform_resume(struct device *dev)
825{
826 struct ata_host *host = dev_get_drvdata(dev);
827 struct ahci_host_priv *hpriv = host->private_data;
828 int rc;
829
830 rc = ahci_platform_enable_resources(hpriv);
831 if (rc)
832 return rc;
833
834 rc = ahci_platform_resume_host(dev);
835 if (rc)
836 goto disable_resources;
837
838 /* We resumed so update PM runtime state */
839 pm_runtime_disable(dev);
840 pm_runtime_set_active(dev);
841 pm_runtime_enable(dev);
842
843 return 0;
844
845disable_resources:
846 ahci_platform_disable_resources(hpriv);
847
848 return rc;
849}
850EXPORT_SYMBOL_GPL(ahci_platform_resume);
851#endif
852
853MODULE_DESCRIPTION("AHCI SATA platform library");
854MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
855MODULE_LICENSE("GPL");
856