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fd990556 BZ |
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> | |
c7d7ddee | 27 | #include <linux/of_platform.h> |
fd990556 BZ |
28 | #include "ahci.h" |
29 | ||
30 | static void ahci_host_stop(struct ata_host *host); | |
31 | ||
32 | struct ata_port_operations ahci_platform_ops = { | |
33 | .inherits = &ahci_ops, | |
34 | .host_stop = ahci_host_stop, | |
35 | }; | |
36 | EXPORT_SYMBOL_GPL(ahci_platform_ops); | |
37 | ||
38 | static struct scsi_host_template ahci_platform_sht = { | |
39 | AHCI_SHT("ahci_platform"), | |
40 | }; | |
41 | ||
b1a9edbd AT |
42 | /** |
43 | * ahci_platform_enable_phys - Enable PHYs | |
44 | * @hpriv: host private area to store config values | |
45 | * | |
46 | * This function enables all the PHYs found in hpriv->phys, if any. | |
47 | * If a PHY fails to be enabled, it disables all the PHYs already | |
48 | * enabled in reverse order and returns an error. | |
49 | * | |
50 | * RETURNS: | |
51 | * 0 on success otherwise a negative error code | |
52 | */ | |
6bb86fef | 53 | static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) |
b1a9edbd AT |
54 | { |
55 | int rc, i; | |
56 | ||
57 | for (i = 0; i < hpriv->nports; i++) { | |
b1a9edbd AT |
58 | rc = phy_init(hpriv->phys[i]); |
59 | if (rc) | |
60 | goto disable_phys; | |
61 | ||
62 | rc = phy_power_on(hpriv->phys[i]); | |
63 | if (rc) { | |
64 | phy_exit(hpriv->phys[i]); | |
65 | goto disable_phys; | |
66 | } | |
67 | } | |
68 | ||
69 | return 0; | |
70 | ||
71 | disable_phys: | |
72 | while (--i >= 0) { | |
73 | phy_power_off(hpriv->phys[i]); | |
74 | phy_exit(hpriv->phys[i]); | |
75 | } | |
76 | return rc; | |
77 | } | |
b1a9edbd AT |
78 | |
79 | /** | |
80 | * ahci_platform_disable_phys - Disable PHYs | |
81 | * @hpriv: host private area to store config values | |
82 | * | |
83 | * This function disables all PHYs found in hpriv->phys. | |
84 | */ | |
6bb86fef | 85 | static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) |
b1a9edbd AT |
86 | { |
87 | int i; | |
88 | ||
89 | for (i = 0; i < hpriv->nports; i++) { | |
b1a9edbd AT |
90 | phy_power_off(hpriv->phys[i]); |
91 | phy_exit(hpriv->phys[i]); | |
92 | } | |
93 | } | |
b1a9edbd | 94 | |
fd990556 BZ |
95 | /** |
96 | * ahci_platform_enable_clks - Enable platform clocks | |
97 | * @hpriv: host private area to store config values | |
98 | * | |
99 | * This function enables all the clks found in hpriv->clks, starting at | |
100 | * index 0. If any clk fails to enable it disables all the clks already | |
101 | * enabled in reverse order, and then returns an error. | |
102 | * | |
103 | * RETURNS: | |
104 | * 0 on success otherwise a negative error code | |
105 | */ | |
106 | int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) | |
107 | { | |
108 | int c, rc; | |
109 | ||
110 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { | |
111 | rc = clk_prepare_enable(hpriv->clks[c]); | |
112 | if (rc) | |
113 | goto disable_unprepare_clk; | |
114 | } | |
115 | return 0; | |
116 | ||
117 | disable_unprepare_clk: | |
118 | while (--c >= 0) | |
119 | clk_disable_unprepare(hpriv->clks[c]); | |
120 | return rc; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); | |
123 | ||
124 | /** | |
125 | * ahci_platform_disable_clks - Disable platform clocks | |
126 | * @hpriv: host private area to store config values | |
127 | * | |
128 | * This function disables all the clks found in hpriv->clks, in reverse | |
129 | * order of ahci_platform_enable_clks (starting at the end of the array). | |
130 | */ | |
131 | void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) | |
132 | { | |
133 | int c; | |
134 | ||
135 | for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) | |
136 | if (hpriv->clks[c]) | |
137 | clk_disable_unprepare(hpriv->clks[c]); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); | |
140 | ||
c7d7ddee GC |
141 | /** |
142 | * ahci_platform_enable_regulators - Enable regulators | |
143 | * @hpriv: host private area to store config values | |
144 | * | |
145 | * This function enables all the regulators found in | |
146 | * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it | |
147 | * disables all the regulators already enabled in reverse order and | |
148 | * returns an error. | |
149 | * | |
150 | * RETURNS: | |
151 | * 0 on success otherwise a negative error code | |
152 | */ | |
153 | int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) | |
154 | { | |
155 | int rc, i; | |
156 | ||
157 | for (i = 0; i < hpriv->nports; i++) { | |
158 | if (!hpriv->target_pwrs[i]) | |
159 | continue; | |
160 | ||
161 | rc = regulator_enable(hpriv->target_pwrs[i]); | |
162 | if (rc) | |
163 | goto disable_target_pwrs; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | ||
168 | disable_target_pwrs: | |
169 | while (--i >= 0) | |
170 | if (hpriv->target_pwrs[i]) | |
171 | regulator_disable(hpriv->target_pwrs[i]); | |
172 | ||
173 | return rc; | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); | |
176 | ||
177 | /** | |
178 | * ahci_platform_disable_regulators - Disable regulators | |
179 | * @hpriv: host private area to store config values | |
180 | * | |
181 | * This function disables all regulators found in hpriv->target_pwrs. | |
182 | */ | |
183 | void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) | |
184 | { | |
185 | int i; | |
186 | ||
187 | for (i = 0; i < hpriv->nports; i++) { | |
188 | if (!hpriv->target_pwrs[i]) | |
189 | continue; | |
190 | regulator_disable(hpriv->target_pwrs[i]); | |
191 | } | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); | |
fd990556 BZ |
194 | /** |
195 | * ahci_platform_enable_resources - Enable platform resources | |
196 | * @hpriv: host private area to store config values | |
197 | * | |
198 | * This function enables all ahci_platform managed resources in the | |
199 | * following order: | |
200 | * 1) Regulator | |
201 | * 2) Clocks (through ahci_platform_enable_clks) | |
b1a9edbd | 202 | * 3) Phys |
fd990556 BZ |
203 | * |
204 | * If resource enabling fails at any point the previous enabled resources | |
205 | * are disabled in reverse order. | |
206 | * | |
207 | * RETURNS: | |
208 | * 0 on success otherwise a negative error code | |
209 | */ | |
210 | int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) | |
211 | { | |
212 | int rc; | |
213 | ||
c7d7ddee GC |
214 | rc = ahci_platform_enable_regulators(hpriv); |
215 | if (rc) | |
216 | return rc; | |
fd990556 BZ |
217 | |
218 | rc = ahci_platform_enable_clks(hpriv); | |
219 | if (rc) | |
220 | goto disable_regulator; | |
221 | ||
b1a9edbd AT |
222 | rc = ahci_platform_enable_phys(hpriv); |
223 | if (rc) | |
224 | goto disable_clks; | |
fd990556 BZ |
225 | |
226 | return 0; | |
227 | ||
228 | disable_clks: | |
229 | ahci_platform_disable_clks(hpriv); | |
230 | ||
231 | disable_regulator: | |
c7d7ddee GC |
232 | ahci_platform_disable_regulators(hpriv); |
233 | ||
fd990556 BZ |
234 | return rc; |
235 | } | |
236 | EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); | |
237 | ||
238 | /** | |
239 | * ahci_platform_disable_resources - Disable platform resources | |
240 | * @hpriv: host private area to store config values | |
241 | * | |
242 | * This function disables all ahci_platform managed resources in the | |
243 | * following order: | |
b1a9edbd | 244 | * 1) Phys |
fd990556 BZ |
245 | * 2) Clocks (through ahci_platform_disable_clks) |
246 | * 3) Regulator | |
247 | */ | |
248 | void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) | |
249 | { | |
b1a9edbd | 250 | ahci_platform_disable_phys(hpriv); |
fd990556 BZ |
251 | |
252 | ahci_platform_disable_clks(hpriv); | |
253 | ||
c7d7ddee | 254 | ahci_platform_disable_regulators(hpriv); |
fd990556 BZ |
255 | } |
256 | EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); | |
257 | ||
258 | static void ahci_platform_put_resources(struct device *dev, void *res) | |
259 | { | |
260 | struct ahci_host_priv *hpriv = res; | |
261 | int c; | |
262 | ||
263 | if (hpriv->got_runtime_pm) { | |
264 | pm_runtime_put_sync(dev); | |
265 | pm_runtime_disable(dev); | |
266 | } | |
267 | ||
268 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) | |
269 | clk_put(hpriv->clks[c]); | |
c7d7ddee GC |
270 | /* |
271 | * The regulators are tied to child node device and not to the | |
272 | * SATA device itself. So we can't use devm for automatically | |
273 | * releasing them. We have to do it manually here. | |
274 | */ | |
275 | for (c = 0; c < hpriv->nports; c++) | |
276 | if (hpriv->target_pwrs && hpriv->target_pwrs[c]) | |
277 | regulator_put(hpriv->target_pwrs[c]); | |
278 | ||
279 | } | |
280 | ||
281 | static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, | |
282 | struct device *dev, struct device_node *node) | |
283 | { | |
284 | int rc; | |
285 | ||
286 | hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); | |
287 | ||
288 | if (!IS_ERR(hpriv->phys[port])) | |
289 | return 0; | |
290 | ||
291 | rc = PTR_ERR(hpriv->phys[port]); | |
292 | switch (rc) { | |
293 | case -ENOSYS: | |
294 | /* No PHY support. Check if PHY is required. */ | |
295 | if (of_find_property(node, "phys", NULL)) { | |
296 | dev_err(dev, | |
297 | "couldn't get PHY in node %s: ENOSYS\n", | |
298 | node->name); | |
299 | break; | |
300 | } | |
301 | case -ENODEV: | |
302 | /* continue normally */ | |
303 | hpriv->phys[port] = NULL; | |
304 | rc = 0; | |
305 | break; | |
306 | ||
307 | default: | |
308 | dev_err(dev, | |
309 | "couldn't get PHY in node %s: %d\n", | |
310 | node->name, rc); | |
311 | ||
312 | break; | |
313 | } | |
314 | ||
315 | return rc; | |
316 | } | |
317 | ||
318 | static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, | |
319 | struct device *dev) | |
320 | { | |
321 | struct regulator *target_pwr; | |
322 | int rc = 0; | |
323 | ||
324 | target_pwr = regulator_get_optional(dev, "target"); | |
325 | ||
326 | if (!IS_ERR(target_pwr)) | |
327 | hpriv->target_pwrs[port] = target_pwr; | |
328 | else | |
329 | rc = PTR_ERR(target_pwr); | |
330 | ||
331 | return rc; | |
fd990556 BZ |
332 | } |
333 | ||
334 | /** | |
335 | * ahci_platform_get_resources - Get platform resources | |
336 | * @pdev: platform device to get resources for | |
337 | * | |
338 | * This function allocates an ahci_host_priv struct, and gets the following | |
339 | * resources, storing a reference to them inside the returned struct: | |
340 | * | |
341 | * 1) mmio registers (IORESOURCE_MEM 0, mandatory) | |
342 | * 2) regulator for controlling the targets power (optional) | |
343 | * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, | |
344 | * or for non devicetree enabled platforms a single clock | |
b1a9edbd | 345 | * 4) phys (optional) |
fd990556 BZ |
346 | * |
347 | * RETURNS: | |
348 | * The allocated ahci_host_priv on success, otherwise an ERR_PTR value | |
349 | */ | |
350 | struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev) | |
351 | { | |
352 | struct device *dev = &pdev->dev; | |
353 | struct ahci_host_priv *hpriv; | |
354 | struct clk *clk; | |
b1a9edbd | 355 | struct device_node *child; |
c7d7ddee | 356 | int i, sz, enabled_ports = 0, rc = -ENOMEM, child_nodes; |
b1a9edbd | 357 | u32 mask_port_map = 0; |
fd990556 BZ |
358 | |
359 | if (!devres_open_group(dev, NULL, GFP_KERNEL)) | |
360 | return ERR_PTR(-ENOMEM); | |
361 | ||
362 | hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), | |
363 | GFP_KERNEL); | |
364 | if (!hpriv) | |
365 | goto err_out; | |
366 | ||
367 | devres_add(dev, hpriv); | |
368 | ||
369 | hpriv->mmio = devm_ioremap_resource(dev, | |
370 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
371 | if (IS_ERR(hpriv->mmio)) { | |
372 | dev_err(dev, "no mmio space\n"); | |
373 | rc = PTR_ERR(hpriv->mmio); | |
374 | goto err_out; | |
375 | } | |
376 | ||
fd990556 BZ |
377 | for (i = 0; i < AHCI_MAX_CLKS; i++) { |
378 | /* | |
379 | * For now we must use clk_get(dev, NULL) for the first clock, | |
380 | * because some platforms (da850, spear13xx) are not yet | |
381 | * converted to use devicetree for clocks. For new platforms | |
382 | * this is equivalent to of_clk_get(dev->of_node, 0). | |
383 | */ | |
384 | if (i == 0) | |
385 | clk = clk_get(dev, NULL); | |
386 | else | |
387 | clk = of_clk_get(dev->of_node, i); | |
388 | ||
389 | if (IS_ERR(clk)) { | |
390 | rc = PTR_ERR(clk); | |
391 | if (rc == -EPROBE_DEFER) | |
392 | goto err_out; | |
393 | break; | |
394 | } | |
395 | hpriv->clks[i] = clk; | |
396 | } | |
397 | ||
c7d7ddee | 398 | hpriv->nports = child_nodes = of_get_child_count(dev->of_node); |
b1a9edbd | 399 | |
c7d7ddee GC |
400 | /* |
401 | * If no sub-node was found, we still need to set nports to | |
402 | * one in order to be able to use the | |
403 | * ahci_platform_[en|dis]able_[phys|regulators] functions. | |
404 | */ | |
405 | if (!child_nodes) | |
406 | hpriv->nports = 1; | |
407 | ||
408 | sz = hpriv->nports * sizeof(*hpriv->phys); | |
409 | hpriv->phys = devm_kzalloc(dev, sz, GFP_KERNEL); | |
410 | if (!hpriv->phys) { | |
411 | rc = -ENOMEM; | |
412 | goto err_out; | |
413 | } | |
414 | sz = hpriv->nports * sizeof(*hpriv->target_pwrs); | |
415 | hpriv->target_pwrs = devm_kzalloc(dev, sz, GFP_KERNEL); | |
416 | if (!hpriv->target_pwrs) { | |
417 | rc = -ENOMEM; | |
418 | goto err_out; | |
419 | } | |
b1a9edbd | 420 | |
c7d7ddee | 421 | if (child_nodes) { |
b1a9edbd AT |
422 | for_each_child_of_node(dev->of_node, child) { |
423 | u32 port; | |
c7d7ddee | 424 | struct platform_device *port_dev; |
b1a9edbd AT |
425 | |
426 | if (!of_device_is_available(child)) | |
427 | continue; | |
428 | ||
429 | if (of_property_read_u32(child, "reg", &port)) { | |
430 | rc = -EINVAL; | |
acbd5733 MP |
431 | goto err_out; |
432 | } | |
fd990556 | 433 | |
b1a9edbd AT |
434 | if (port >= hpriv->nports) { |
435 | dev_warn(dev, "invalid port number %d\n", port); | |
436 | continue; | |
437 | } | |
b1a9edbd AT |
438 | mask_port_map |= BIT(port); |
439 | ||
c7d7ddee GC |
440 | of_platform_device_create(child, NULL, NULL); |
441 | ||
442 | port_dev = of_find_device_by_node(child); | |
443 | ||
444 | if (port_dev) { | |
445 | rc = ahci_platform_get_regulator(hpriv, port, | |
446 | &port_dev->dev); | |
447 | if (rc == -EPROBE_DEFER) | |
448 | goto err_out; | |
b1a9edbd | 449 | } |
fd990556 | 450 | |
c7d7ddee GC |
451 | rc = ahci_platform_get_phy(hpriv, port, dev, child); |
452 | if (rc) | |
453 | goto err_out; | |
454 | ||
b1a9edbd AT |
455 | enabled_ports++; |
456 | } | |
457 | if (!enabled_ports) { | |
458 | dev_warn(dev, "No port enabled\n"); | |
459 | rc = -ENODEV; | |
fd990556 BZ |
460 | goto err_out; |
461 | } | |
b1a9edbd AT |
462 | |
463 | if (!hpriv->mask_port_map) | |
464 | hpriv->mask_port_map = mask_port_map; | |
465 | } else { | |
466 | /* | |
467 | * If no sub-node was found, keep this for device tree | |
468 | * compatibility | |
469 | */ | |
c7d7ddee GC |
470 | rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); |
471 | if (rc) | |
472 | goto err_out; | |
b1a9edbd | 473 | |
c7d7ddee GC |
474 | rc = ahci_platform_get_regulator(hpriv, 0, dev); |
475 | if (rc == -EPROBE_DEFER) | |
476 | goto err_out; | |
fd990556 | 477 | } |
fd990556 BZ |
478 | pm_runtime_enable(dev); |
479 | pm_runtime_get_sync(dev); | |
480 | hpriv->got_runtime_pm = true; | |
481 | ||
482 | devres_remove_group(dev, NULL); | |
483 | return hpriv; | |
484 | ||
485 | err_out: | |
486 | devres_release_group(dev, NULL); | |
487 | return ERR_PTR(rc); | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(ahci_platform_get_resources); | |
490 | ||
491 | /** | |
492 | * ahci_platform_init_host - Bring up an ahci-platform host | |
493 | * @pdev: platform device pointer for the host | |
494 | * @hpriv: ahci-host private data for the host | |
495 | * @pi_template: template for the ata_port_info to use | |
fd990556 BZ |
496 | * |
497 | * This function does all the usual steps needed to bring up an | |
b1a9edbd | 498 | * ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
fd990556 BZ |
499 | * must be initialized / enabled before calling this. |
500 | * | |
501 | * RETURNS: | |
502 | * 0 on success otherwise a negative error code | |
503 | */ | |
504 | int ahci_platform_init_host(struct platform_device *pdev, | |
505 | struct ahci_host_priv *hpriv, | |
725c7b57 | 506 | const struct ata_port_info *pi_template) |
fd990556 BZ |
507 | { |
508 | struct device *dev = &pdev->dev; | |
509 | struct ata_port_info pi = *pi_template; | |
510 | const struct ata_port_info *ppi[] = { &pi, NULL }; | |
511 | struct ata_host *host; | |
512 | int i, irq, n_ports, rc; | |
513 | ||
514 | irq = platform_get_irq(pdev, 0); | |
515 | if (irq <= 0) { | |
516 | dev_err(dev, "no irq\n"); | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | /* prepare host */ | |
c4121c65 | 521 | pi.private_data = (void *)(unsigned long)hpriv->flags; |
fd990556 | 522 | |
725c7b57 | 523 | ahci_save_initial_config(dev, hpriv); |
fd990556 BZ |
524 | |
525 | if (hpriv->cap & HOST_CAP_NCQ) | |
526 | pi.flags |= ATA_FLAG_NCQ; | |
527 | ||
528 | if (hpriv->cap & HOST_CAP_PMP) | |
529 | pi.flags |= ATA_FLAG_PMP; | |
530 | ||
531 | ahci_set_em_messages(hpriv, &pi); | |
532 | ||
533 | /* CAP.NP sometimes indicate the index of the last enabled | |
534 | * port, at other times, that of the last possible port, so | |
535 | * determining the maximum port number requires looking at | |
536 | * both CAP.NP and port_map. | |
537 | */ | |
538 | n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); | |
539 | ||
540 | host = ata_host_alloc_pinfo(dev, ppi, n_ports); | |
541 | if (!host) | |
542 | return -ENOMEM; | |
543 | ||
544 | host->private_data = hpriv; | |
545 | ||
546 | if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) | |
547 | host->flags |= ATA_HOST_PARALLEL_SCAN; | |
548 | else | |
549 | dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); | |
550 | ||
551 | if (pi.flags & ATA_FLAG_EM) | |
552 | ahci_reset_em(host); | |
553 | ||
554 | for (i = 0; i < host->n_ports; i++) { | |
555 | struct ata_port *ap = host->ports[i]; | |
556 | ||
557 | ata_port_desc(ap, "mmio %pR", | |
558 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
559 | ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); | |
560 | ||
561 | /* set enclosure management message type */ | |
562 | if (ap->flags & ATA_FLAG_EM) | |
563 | ap->em_message_type = hpriv->em_msg_type; | |
564 | ||
565 | /* disabled/not-implemented port */ | |
566 | if (!(hpriv->port_map & (1 << i))) | |
567 | ap->ops = &ata_dummy_port_ops; | |
568 | } | |
569 | ||
cc7a9e27 SS |
570 | if (hpriv->cap & HOST_CAP_64) { |
571 | rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); | |
572 | if (rc) { | |
573 | rc = dma_coerce_mask_and_coherent(dev, | |
574 | DMA_BIT_MASK(32)); | |
575 | if (rc) { | |
576 | dev_err(dev, "Failed to enable 64-bit DMA.\n"); | |
577 | return rc; | |
578 | } | |
579 | dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); | |
580 | } | |
581 | } | |
582 | ||
fd990556 BZ |
583 | rc = ahci_reset_controller(host); |
584 | if (rc) | |
585 | return rc; | |
586 | ||
587 | ahci_init_controller(host); | |
588 | ahci_print_info(host, "platform"); | |
589 | ||
d1028e2f | 590 | return ahci_host_activate(host, irq, &ahci_platform_sht); |
fd990556 BZ |
591 | } |
592 | EXPORT_SYMBOL_GPL(ahci_platform_init_host); | |
593 | ||
594 | static void ahci_host_stop(struct ata_host *host) | |
595 | { | |
fd990556 BZ |
596 | struct ahci_host_priv *hpriv = host->private_data; |
597 | ||
fd990556 BZ |
598 | ahci_platform_disable_resources(hpriv); |
599 | } | |
600 | ||
601 | #ifdef CONFIG_PM_SLEEP | |
602 | /** | |
603 | * ahci_platform_suspend_host - Suspend an ahci-platform host | |
604 | * @dev: device pointer for the host | |
605 | * | |
606 | * This function does all the usual steps needed to suspend an | |
b1a9edbd | 607 | * ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
fd990556 BZ |
608 | * must be disabled after calling this. |
609 | * | |
610 | * RETURNS: | |
611 | * 0 on success otherwise a negative error code | |
612 | */ | |
613 | int ahci_platform_suspend_host(struct device *dev) | |
614 | { | |
615 | struct ata_host *host = dev_get_drvdata(dev); | |
616 | struct ahci_host_priv *hpriv = host->private_data; | |
617 | void __iomem *mmio = hpriv->mmio; | |
618 | u32 ctl; | |
619 | ||
620 | if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { | |
621 | dev_err(dev, "firmware update required for suspend/resume\n"); | |
622 | return -EIO; | |
623 | } | |
624 | ||
625 | /* | |
626 | * AHCI spec rev1.1 section 8.3.3: | |
627 | * Software must disable interrupts prior to requesting a | |
628 | * transition of the HBA to D3 state. | |
629 | */ | |
630 | ctl = readl(mmio + HOST_CTL); | |
631 | ctl &= ~HOST_IRQ_EN; | |
632 | writel(ctl, mmio + HOST_CTL); | |
633 | readl(mmio + HOST_CTL); /* flush */ | |
634 | ||
635 | return ata_host_suspend(host, PMSG_SUSPEND); | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); | |
638 | ||
639 | /** | |
640 | * ahci_platform_resume_host - Resume an ahci-platform host | |
641 | * @dev: device pointer for the host | |
642 | * | |
643 | * This function does all the usual steps needed to resume an ahci-platform | |
b1a9edbd | 644 | * host, note any necessary resources (ie clks, phys, etc.) must be |
fd990556 BZ |
645 | * initialized / enabled before calling this. |
646 | * | |
647 | * RETURNS: | |
648 | * 0 on success otherwise a negative error code | |
649 | */ | |
650 | int ahci_platform_resume_host(struct device *dev) | |
651 | { | |
652 | struct ata_host *host = dev_get_drvdata(dev); | |
653 | int rc; | |
654 | ||
655 | if (dev->power.power_state.event == PM_EVENT_SUSPEND) { | |
656 | rc = ahci_reset_controller(host); | |
657 | if (rc) | |
658 | return rc; | |
659 | ||
660 | ahci_init_controller(host); | |
661 | } | |
662 | ||
663 | ata_host_resume(host); | |
664 | ||
665 | return 0; | |
666 | } | |
667 | EXPORT_SYMBOL_GPL(ahci_platform_resume_host); | |
668 | ||
669 | /** | |
670 | * ahci_platform_suspend - Suspend an ahci-platform device | |
671 | * @dev: the platform device to suspend | |
672 | * | |
673 | * This function suspends the host associated with the device, followed by | |
674 | * disabling all the resources of the device. | |
675 | * | |
676 | * RETURNS: | |
677 | * 0 on success otherwise a negative error code | |
678 | */ | |
679 | int ahci_platform_suspend(struct device *dev) | |
680 | { | |
fd990556 BZ |
681 | struct ata_host *host = dev_get_drvdata(dev); |
682 | struct ahci_host_priv *hpriv = host->private_data; | |
683 | int rc; | |
684 | ||
685 | rc = ahci_platform_suspend_host(dev); | |
686 | if (rc) | |
687 | return rc; | |
688 | ||
fd990556 BZ |
689 | ahci_platform_disable_resources(hpriv); |
690 | ||
691 | return 0; | |
fd990556 BZ |
692 | } |
693 | EXPORT_SYMBOL_GPL(ahci_platform_suspend); | |
694 | ||
695 | /** | |
696 | * ahci_platform_resume - Resume an ahci-platform device | |
697 | * @dev: the platform device to resume | |
698 | * | |
699 | * This function enables all the resources of the device followed by | |
700 | * resuming the host associated with the device. | |
701 | * | |
702 | * RETURNS: | |
703 | * 0 on success otherwise a negative error code | |
704 | */ | |
705 | int ahci_platform_resume(struct device *dev) | |
706 | { | |
fd990556 BZ |
707 | struct ata_host *host = dev_get_drvdata(dev); |
708 | struct ahci_host_priv *hpriv = host->private_data; | |
709 | int rc; | |
710 | ||
711 | rc = ahci_platform_enable_resources(hpriv); | |
712 | if (rc) | |
713 | return rc; | |
714 | ||
fd990556 BZ |
715 | rc = ahci_platform_resume_host(dev); |
716 | if (rc) | |
717 | goto disable_resources; | |
718 | ||
719 | /* We resumed so update PM runtime state */ | |
720 | pm_runtime_disable(dev); | |
721 | pm_runtime_set_active(dev); | |
722 | pm_runtime_enable(dev); | |
723 | ||
724 | return 0; | |
725 | ||
726 | disable_resources: | |
727 | ahci_platform_disable_resources(hpriv); | |
728 | ||
729 | return rc; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(ahci_platform_resume); | |
732 | #endif | |
733 | ||
734 | MODULE_DESCRIPTION("AHCI SATA platform library"); | |
735 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | |
736 | MODULE_LICENSE("GPL"); |