Commit | Line | Data |
---|---|---|
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 | ||
55294150 | 279 | kfree(hpriv->target_pwrs); |
c7d7ddee GC |
280 | } |
281 | ||
282 | static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, | |
283 | struct device *dev, struct device_node *node) | |
284 | { | |
285 | int rc; | |
286 | ||
287 | hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); | |
288 | ||
289 | if (!IS_ERR(hpriv->phys[port])) | |
290 | return 0; | |
291 | ||
292 | rc = PTR_ERR(hpriv->phys[port]); | |
293 | switch (rc) { | |
294 | case -ENOSYS: | |
295 | /* No PHY support. Check if PHY is required. */ | |
296 | if (of_find_property(node, "phys", NULL)) { | |
297 | dev_err(dev, | |
298 | "couldn't get PHY in node %s: ENOSYS\n", | |
299 | node->name); | |
300 | break; | |
301 | } | |
302 | case -ENODEV: | |
303 | /* continue normally */ | |
304 | hpriv->phys[port] = NULL; | |
305 | rc = 0; | |
306 | break; | |
307 | ||
308 | default: | |
309 | dev_err(dev, | |
310 | "couldn't get PHY in node %s: %d\n", | |
311 | node->name, rc); | |
312 | ||
313 | break; | |
314 | } | |
315 | ||
316 | return rc; | |
317 | } | |
318 | ||
319 | static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, | |
320 | struct device *dev) | |
321 | { | |
322 | struct regulator *target_pwr; | |
323 | int rc = 0; | |
324 | ||
325 | target_pwr = regulator_get_optional(dev, "target"); | |
326 | ||
327 | if (!IS_ERR(target_pwr)) | |
328 | hpriv->target_pwrs[port] = target_pwr; | |
329 | else | |
330 | rc = PTR_ERR(target_pwr); | |
331 | ||
332 | return rc; | |
fd990556 BZ |
333 | } |
334 | ||
335 | /** | |
336 | * ahci_platform_get_resources - Get platform resources | |
337 | * @pdev: platform device to get resources for | |
338 | * | |
339 | * This function allocates an ahci_host_priv struct, and gets the following | |
340 | * resources, storing a reference to them inside the returned struct: | |
341 | * | |
342 | * 1) mmio registers (IORESOURCE_MEM 0, mandatory) | |
343 | * 2) regulator for controlling the targets power (optional) | |
344 | * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, | |
345 | * or for non devicetree enabled platforms a single clock | |
b1a9edbd | 346 | * 4) phys (optional) |
fd990556 BZ |
347 | * |
348 | * RETURNS: | |
349 | * The allocated ahci_host_priv on success, otherwise an ERR_PTR value | |
350 | */ | |
351 | struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev) | |
352 | { | |
353 | struct device *dev = &pdev->dev; | |
354 | struct ahci_host_priv *hpriv; | |
355 | struct clk *clk; | |
b1a9edbd | 356 | struct device_node *child; |
c7d7ddee | 357 | int i, sz, enabled_ports = 0, rc = -ENOMEM, child_nodes; |
b1a9edbd | 358 | u32 mask_port_map = 0; |
fd990556 BZ |
359 | |
360 | if (!devres_open_group(dev, NULL, GFP_KERNEL)) | |
361 | return ERR_PTR(-ENOMEM); | |
362 | ||
363 | hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), | |
364 | GFP_KERNEL); | |
365 | if (!hpriv) | |
366 | goto err_out; | |
367 | ||
368 | devres_add(dev, hpriv); | |
369 | ||
370 | hpriv->mmio = devm_ioremap_resource(dev, | |
371 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
372 | if (IS_ERR(hpriv->mmio)) { | |
373 | dev_err(dev, "no mmio space\n"); | |
374 | rc = PTR_ERR(hpriv->mmio); | |
375 | goto err_out; | |
376 | } | |
377 | ||
fd990556 BZ |
378 | for (i = 0; i < AHCI_MAX_CLKS; i++) { |
379 | /* | |
380 | * For now we must use clk_get(dev, NULL) for the first clock, | |
381 | * because some platforms (da850, spear13xx) are not yet | |
382 | * converted to use devicetree for clocks. For new platforms | |
383 | * this is equivalent to of_clk_get(dev->of_node, 0). | |
384 | */ | |
385 | if (i == 0) | |
386 | clk = clk_get(dev, NULL); | |
387 | else | |
388 | clk = of_clk_get(dev->of_node, i); | |
389 | ||
390 | if (IS_ERR(clk)) { | |
391 | rc = PTR_ERR(clk); | |
392 | if (rc == -EPROBE_DEFER) | |
393 | goto err_out; | |
394 | break; | |
395 | } | |
396 | hpriv->clks[i] = clk; | |
397 | } | |
398 | ||
c7d7ddee | 399 | hpriv->nports = child_nodes = of_get_child_count(dev->of_node); |
b1a9edbd | 400 | |
c7d7ddee GC |
401 | /* |
402 | * If no sub-node was found, we still need to set nports to | |
403 | * one in order to be able to use the | |
404 | * ahci_platform_[en|dis]able_[phys|regulators] functions. | |
405 | */ | |
406 | if (!child_nodes) | |
407 | hpriv->nports = 1; | |
408 | ||
409 | sz = hpriv->nports * sizeof(*hpriv->phys); | |
410 | hpriv->phys = devm_kzalloc(dev, sz, GFP_KERNEL); | |
411 | if (!hpriv->phys) { | |
412 | rc = -ENOMEM; | |
413 | goto err_out; | |
414 | } | |
415 | sz = hpriv->nports * sizeof(*hpriv->target_pwrs); | |
55294150 | 416 | hpriv->target_pwrs = kzalloc(sz, GFP_KERNEL); |
c7d7ddee GC |
417 | if (!hpriv->target_pwrs) { |
418 | rc = -ENOMEM; | |
419 | goto err_out; | |
420 | } | |
b1a9edbd | 421 | |
c7d7ddee | 422 | if (child_nodes) { |
b1a9edbd AT |
423 | for_each_child_of_node(dev->of_node, child) { |
424 | u32 port; | |
c7d7ddee | 425 | struct platform_device *port_dev; |
b1a9edbd AT |
426 | |
427 | if (!of_device_is_available(child)) | |
428 | continue; | |
429 | ||
430 | if (of_property_read_u32(child, "reg", &port)) { | |
431 | rc = -EINVAL; | |
acbd5733 MP |
432 | goto err_out; |
433 | } | |
fd990556 | 434 | |
b1a9edbd AT |
435 | if (port >= hpriv->nports) { |
436 | dev_warn(dev, "invalid port number %d\n", port); | |
437 | continue; | |
438 | } | |
b1a9edbd AT |
439 | mask_port_map |= BIT(port); |
440 | ||
c7d7ddee GC |
441 | of_platform_device_create(child, NULL, NULL); |
442 | ||
443 | port_dev = of_find_device_by_node(child); | |
444 | ||
445 | if (port_dev) { | |
446 | rc = ahci_platform_get_regulator(hpriv, port, | |
447 | &port_dev->dev); | |
448 | if (rc == -EPROBE_DEFER) | |
449 | goto err_out; | |
b1a9edbd | 450 | } |
fd990556 | 451 | |
c7d7ddee GC |
452 | rc = ahci_platform_get_phy(hpriv, port, dev, child); |
453 | if (rc) | |
454 | goto err_out; | |
455 | ||
b1a9edbd AT |
456 | enabled_ports++; |
457 | } | |
458 | if (!enabled_ports) { | |
459 | dev_warn(dev, "No port enabled\n"); | |
460 | rc = -ENODEV; | |
fd990556 BZ |
461 | goto err_out; |
462 | } | |
b1a9edbd AT |
463 | |
464 | if (!hpriv->mask_port_map) | |
465 | hpriv->mask_port_map = mask_port_map; | |
466 | } else { | |
467 | /* | |
468 | * If no sub-node was found, keep this for device tree | |
469 | * compatibility | |
470 | */ | |
c7d7ddee GC |
471 | rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); |
472 | if (rc) | |
473 | goto err_out; | |
b1a9edbd | 474 | |
c7d7ddee GC |
475 | rc = ahci_platform_get_regulator(hpriv, 0, dev); |
476 | if (rc == -EPROBE_DEFER) | |
477 | goto err_out; | |
fd990556 | 478 | } |
fd990556 BZ |
479 | pm_runtime_enable(dev); |
480 | pm_runtime_get_sync(dev); | |
481 | hpriv->got_runtime_pm = true; | |
482 | ||
483 | devres_remove_group(dev, NULL); | |
484 | return hpriv; | |
485 | ||
486 | err_out: | |
487 | devres_release_group(dev, NULL); | |
488 | return ERR_PTR(rc); | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(ahci_platform_get_resources); | |
491 | ||
492 | /** | |
493 | * ahci_platform_init_host - Bring up an ahci-platform host | |
494 | * @pdev: platform device pointer for the host | |
495 | * @hpriv: ahci-host private data for the host | |
496 | * @pi_template: template for the ata_port_info to use | |
fd990556 BZ |
497 | * |
498 | * This function does all the usual steps needed to bring up an | |
b1a9edbd | 499 | * ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
fd990556 BZ |
500 | * must be initialized / enabled before calling this. |
501 | * | |
502 | * RETURNS: | |
503 | * 0 on success otherwise a negative error code | |
504 | */ | |
505 | int ahci_platform_init_host(struct platform_device *pdev, | |
506 | struct ahci_host_priv *hpriv, | |
725c7b57 | 507 | const struct ata_port_info *pi_template) |
fd990556 BZ |
508 | { |
509 | struct device *dev = &pdev->dev; | |
510 | struct ata_port_info pi = *pi_template; | |
511 | const struct ata_port_info *ppi[] = { &pi, NULL }; | |
512 | struct ata_host *host; | |
513 | int i, irq, n_ports, rc; | |
514 | ||
515 | irq = platform_get_irq(pdev, 0); | |
516 | if (irq <= 0) { | |
517 | dev_err(dev, "no irq\n"); | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | /* prepare host */ | |
c4121c65 | 522 | pi.private_data = (void *)(unsigned long)hpriv->flags; |
fd990556 | 523 | |
725c7b57 | 524 | ahci_save_initial_config(dev, hpriv); |
fd990556 BZ |
525 | |
526 | if (hpriv->cap & HOST_CAP_NCQ) | |
527 | pi.flags |= ATA_FLAG_NCQ; | |
528 | ||
529 | if (hpriv->cap & HOST_CAP_PMP) | |
530 | pi.flags |= ATA_FLAG_PMP; | |
531 | ||
532 | ahci_set_em_messages(hpriv, &pi); | |
533 | ||
534 | /* CAP.NP sometimes indicate the index of the last enabled | |
535 | * port, at other times, that of the last possible port, so | |
536 | * determining the maximum port number requires looking at | |
537 | * both CAP.NP and port_map. | |
538 | */ | |
539 | n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); | |
540 | ||
541 | host = ata_host_alloc_pinfo(dev, ppi, n_ports); | |
542 | if (!host) | |
543 | return -ENOMEM; | |
544 | ||
545 | host->private_data = hpriv; | |
546 | ||
547 | if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) | |
548 | host->flags |= ATA_HOST_PARALLEL_SCAN; | |
549 | else | |
550 | dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); | |
551 | ||
552 | if (pi.flags & ATA_FLAG_EM) | |
553 | ahci_reset_em(host); | |
554 | ||
555 | for (i = 0; i < host->n_ports; i++) { | |
556 | struct ata_port *ap = host->ports[i]; | |
557 | ||
558 | ata_port_desc(ap, "mmio %pR", | |
559 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
560 | ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); | |
561 | ||
562 | /* set enclosure management message type */ | |
563 | if (ap->flags & ATA_FLAG_EM) | |
564 | ap->em_message_type = hpriv->em_msg_type; | |
565 | ||
566 | /* disabled/not-implemented port */ | |
567 | if (!(hpriv->port_map & (1 << i))) | |
568 | ap->ops = &ata_dummy_port_ops; | |
569 | } | |
570 | ||
cc7a9e27 SS |
571 | if (hpriv->cap & HOST_CAP_64) { |
572 | rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); | |
573 | if (rc) { | |
574 | rc = dma_coerce_mask_and_coherent(dev, | |
575 | DMA_BIT_MASK(32)); | |
576 | if (rc) { | |
577 | dev_err(dev, "Failed to enable 64-bit DMA.\n"); | |
578 | return rc; | |
579 | } | |
580 | dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); | |
581 | } | |
582 | } | |
583 | ||
fd990556 BZ |
584 | rc = ahci_reset_controller(host); |
585 | if (rc) | |
586 | return rc; | |
587 | ||
588 | ahci_init_controller(host); | |
589 | ahci_print_info(host, "platform"); | |
590 | ||
d1028e2f | 591 | return ahci_host_activate(host, irq, &ahci_platform_sht); |
fd990556 BZ |
592 | } |
593 | EXPORT_SYMBOL_GPL(ahci_platform_init_host); | |
594 | ||
595 | static void ahci_host_stop(struct ata_host *host) | |
596 | { | |
fd990556 BZ |
597 | struct ahci_host_priv *hpriv = host->private_data; |
598 | ||
fd990556 BZ |
599 | ahci_platform_disable_resources(hpriv); |
600 | } | |
601 | ||
602 | #ifdef CONFIG_PM_SLEEP | |
603 | /** | |
604 | * ahci_platform_suspend_host - Suspend an ahci-platform host | |
605 | * @dev: device pointer for the host | |
606 | * | |
607 | * This function does all the usual steps needed to suspend an | |
b1a9edbd | 608 | * ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
fd990556 BZ |
609 | * must be disabled after calling this. |
610 | * | |
611 | * RETURNS: | |
612 | * 0 on success otherwise a negative error code | |
613 | */ | |
614 | int ahci_platform_suspend_host(struct device *dev) | |
615 | { | |
616 | struct ata_host *host = dev_get_drvdata(dev); | |
617 | struct ahci_host_priv *hpriv = host->private_data; | |
618 | void __iomem *mmio = hpriv->mmio; | |
619 | u32 ctl; | |
620 | ||
621 | if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { | |
622 | dev_err(dev, "firmware update required for suspend/resume\n"); | |
623 | return -EIO; | |
624 | } | |
625 | ||
626 | /* | |
627 | * AHCI spec rev1.1 section 8.3.3: | |
628 | * Software must disable interrupts prior to requesting a | |
629 | * transition of the HBA to D3 state. | |
630 | */ | |
631 | ctl = readl(mmio + HOST_CTL); | |
632 | ctl &= ~HOST_IRQ_EN; | |
633 | writel(ctl, mmio + HOST_CTL); | |
634 | readl(mmio + HOST_CTL); /* flush */ | |
635 | ||
636 | return ata_host_suspend(host, PMSG_SUSPEND); | |
637 | } | |
638 | EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); | |
639 | ||
640 | /** | |
641 | * ahci_platform_resume_host - Resume an ahci-platform host | |
642 | * @dev: device pointer for the host | |
643 | * | |
644 | * This function does all the usual steps needed to resume an ahci-platform | |
b1a9edbd | 645 | * host, note any necessary resources (ie clks, phys, etc.) must be |
fd990556 BZ |
646 | * initialized / enabled before calling this. |
647 | * | |
648 | * RETURNS: | |
649 | * 0 on success otherwise a negative error code | |
650 | */ | |
651 | int ahci_platform_resume_host(struct device *dev) | |
652 | { | |
653 | struct ata_host *host = dev_get_drvdata(dev); | |
654 | int rc; | |
655 | ||
656 | if (dev->power.power_state.event == PM_EVENT_SUSPEND) { | |
657 | rc = ahci_reset_controller(host); | |
658 | if (rc) | |
659 | return rc; | |
660 | ||
661 | ahci_init_controller(host); | |
662 | } | |
663 | ||
664 | ata_host_resume(host); | |
665 | ||
666 | return 0; | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(ahci_platform_resume_host); | |
669 | ||
670 | /** | |
671 | * ahci_platform_suspend - Suspend an ahci-platform device | |
672 | * @dev: the platform device to suspend | |
673 | * | |
674 | * This function suspends the host associated with the device, followed by | |
675 | * disabling all the resources of the device. | |
676 | * | |
677 | * RETURNS: | |
678 | * 0 on success otherwise a negative error code | |
679 | */ | |
680 | int ahci_platform_suspend(struct device *dev) | |
681 | { | |
fd990556 BZ |
682 | struct ata_host *host = dev_get_drvdata(dev); |
683 | struct ahci_host_priv *hpriv = host->private_data; | |
684 | int rc; | |
685 | ||
686 | rc = ahci_platform_suspend_host(dev); | |
687 | if (rc) | |
688 | return rc; | |
689 | ||
fd990556 BZ |
690 | ahci_platform_disable_resources(hpriv); |
691 | ||
692 | return 0; | |
fd990556 BZ |
693 | } |
694 | EXPORT_SYMBOL_GPL(ahci_platform_suspend); | |
695 | ||
696 | /** | |
697 | * ahci_platform_resume - Resume an ahci-platform device | |
698 | * @dev: the platform device to resume | |
699 | * | |
700 | * This function enables all the resources of the device followed by | |
701 | * resuming the host associated with the device. | |
702 | * | |
703 | * RETURNS: | |
704 | * 0 on success otherwise a negative error code | |
705 | */ | |
706 | int ahci_platform_resume(struct device *dev) | |
707 | { | |
fd990556 BZ |
708 | struct ata_host *host = dev_get_drvdata(dev); |
709 | struct ahci_host_priv *hpriv = host->private_data; | |
710 | int rc; | |
711 | ||
712 | rc = ahci_platform_enable_resources(hpriv); | |
713 | if (rc) | |
714 | return rc; | |
715 | ||
fd990556 BZ |
716 | rc = ahci_platform_resume_host(dev); |
717 | if (rc) | |
718 | goto disable_resources; | |
719 | ||
720 | /* We resumed so update PM runtime state */ | |
721 | pm_runtime_disable(dev); | |
722 | pm_runtime_set_active(dev); | |
723 | pm_runtime_enable(dev); | |
724 | ||
725 | return 0; | |
726 | ||
727 | disable_resources: | |
728 | ahci_platform_disable_resources(hpriv); | |
729 | ||
730 | return rc; | |
731 | } | |
732 | EXPORT_SYMBOL_GPL(ahci_platform_resume); | |
733 | #endif | |
734 | ||
735 | MODULE_DESCRIPTION("AHCI SATA platform library"); | |
736 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | |
737 | MODULE_LICENSE("GPL"); |