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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 | ||
b1a9edbd AT |
38 | /** |
39 | * ahci_platform_enable_phys - Enable PHYs | |
40 | * @hpriv: host private area to store config values | |
41 | * | |
42 | * This function enables all the PHYs found in hpriv->phys, if any. | |
43 | * If a PHY fails to be enabled, it disables all the PHYs already | |
44 | * enabled in reverse order and returns an error. | |
45 | * | |
46 | * RETURNS: | |
47 | * 0 on success otherwise a negative error code | |
48 | */ | |
6bb86fef | 49 | static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) |
b1a9edbd AT |
50 | { |
51 | int rc, i; | |
52 | ||
53 | for (i = 0; i < hpriv->nports; i++) { | |
b1a9edbd AT |
54 | rc = phy_init(hpriv->phys[i]); |
55 | if (rc) | |
56 | goto disable_phys; | |
57 | ||
58 | rc = phy_power_on(hpriv->phys[i]); | |
59 | if (rc) { | |
60 | phy_exit(hpriv->phys[i]); | |
61 | goto disable_phys; | |
62 | } | |
63 | } | |
64 | ||
65 | return 0; | |
66 | ||
67 | disable_phys: | |
68 | while (--i >= 0) { | |
69 | phy_power_off(hpriv->phys[i]); | |
70 | phy_exit(hpriv->phys[i]); | |
71 | } | |
72 | return rc; | |
73 | } | |
b1a9edbd AT |
74 | |
75 | /** | |
76 | * ahci_platform_disable_phys - Disable PHYs | |
77 | * @hpriv: host private area to store config values | |
78 | * | |
79 | * This function disables all PHYs found in hpriv->phys. | |
80 | */ | |
6bb86fef | 81 | static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) |
b1a9edbd AT |
82 | { |
83 | int i; | |
84 | ||
85 | for (i = 0; i < hpriv->nports; i++) { | |
b1a9edbd AT |
86 | phy_power_off(hpriv->phys[i]); |
87 | phy_exit(hpriv->phys[i]); | |
88 | } | |
89 | } | |
b1a9edbd | 90 | |
fd990556 BZ |
91 | /** |
92 | * ahci_platform_enable_clks - Enable platform clocks | |
93 | * @hpriv: host private area to store config values | |
94 | * | |
95 | * This function enables all the clks found in hpriv->clks, starting at | |
96 | * index 0. If any clk fails to enable it disables all the clks already | |
97 | * enabled in reverse order, and then returns an error. | |
98 | * | |
99 | * RETURNS: | |
100 | * 0 on success otherwise a negative error code | |
101 | */ | |
102 | int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) | |
103 | { | |
104 | int c, rc; | |
105 | ||
106 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { | |
107 | rc = clk_prepare_enable(hpriv->clks[c]); | |
108 | if (rc) | |
109 | goto disable_unprepare_clk; | |
110 | } | |
111 | return 0; | |
112 | ||
113 | disable_unprepare_clk: | |
114 | while (--c >= 0) | |
115 | clk_disable_unprepare(hpriv->clks[c]); | |
116 | return rc; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); | |
119 | ||
120 | /** | |
121 | * ahci_platform_disable_clks - Disable platform clocks | |
122 | * @hpriv: host private area to store config values | |
123 | * | |
124 | * This function disables all the clks found in hpriv->clks, in reverse | |
125 | * order of ahci_platform_enable_clks (starting at the end of the array). | |
126 | */ | |
127 | void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) | |
128 | { | |
129 | int c; | |
130 | ||
131 | for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) | |
132 | if (hpriv->clks[c]) | |
133 | clk_disable_unprepare(hpriv->clks[c]); | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); | |
136 | ||
c7d7ddee GC |
137 | /** |
138 | * ahci_platform_enable_regulators - Enable regulators | |
139 | * @hpriv: host private area to store config values | |
140 | * | |
141 | * This function enables all the regulators found in | |
142 | * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it | |
143 | * disables all the regulators already enabled in reverse order and | |
144 | * returns an error. | |
145 | * | |
146 | * RETURNS: | |
147 | * 0 on success otherwise a negative error code | |
148 | */ | |
149 | int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) | |
150 | { | |
151 | int rc, i; | |
152 | ||
153 | for (i = 0; i < hpriv->nports; i++) { | |
154 | if (!hpriv->target_pwrs[i]) | |
155 | continue; | |
156 | ||
157 | rc = regulator_enable(hpriv->target_pwrs[i]); | |
158 | if (rc) | |
159 | goto disable_target_pwrs; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | ||
164 | disable_target_pwrs: | |
165 | while (--i >= 0) | |
166 | if (hpriv->target_pwrs[i]) | |
167 | regulator_disable(hpriv->target_pwrs[i]); | |
168 | ||
169 | return rc; | |
170 | } | |
171 | EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); | |
172 | ||
173 | /** | |
174 | * ahci_platform_disable_regulators - Disable regulators | |
175 | * @hpriv: host private area to store config values | |
176 | * | |
177 | * This function disables all regulators found in hpriv->target_pwrs. | |
178 | */ | |
179 | void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) | |
180 | { | |
181 | int i; | |
182 | ||
183 | for (i = 0; i < hpriv->nports; i++) { | |
184 | if (!hpriv->target_pwrs[i]) | |
185 | continue; | |
186 | regulator_disable(hpriv->target_pwrs[i]); | |
187 | } | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); | |
fd990556 BZ |
190 | /** |
191 | * ahci_platform_enable_resources - Enable platform resources | |
192 | * @hpriv: host private area to store config values | |
193 | * | |
194 | * This function enables all ahci_platform managed resources in the | |
195 | * following order: | |
196 | * 1) Regulator | |
197 | * 2) Clocks (through ahci_platform_enable_clks) | |
fd17ed68 | 198 | * 3) Phys |
fd990556 BZ |
199 | * |
200 | * If resource enabling fails at any point the previous enabled resources | |
201 | * are disabled in reverse order. | |
202 | * | |
203 | * RETURNS: | |
204 | * 0 on success otherwise a negative error code | |
205 | */ | |
206 | int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) | |
207 | { | |
208 | int rc; | |
209 | ||
c7d7ddee GC |
210 | rc = ahci_platform_enable_regulators(hpriv); |
211 | if (rc) | |
212 | return rc; | |
fd990556 BZ |
213 | |
214 | rc = ahci_platform_enable_clks(hpriv); | |
215 | if (rc) | |
216 | goto disable_regulator; | |
217 | ||
f0f56716 KH |
218 | rc = ahci_platform_enable_phys(hpriv); |
219 | if (rc) | |
fd17ed68 | 220 | goto disable_clks; |
f0f56716 | 221 | |
fd990556 BZ |
222 | return 0; |
223 | ||
224 | disable_clks: | |
225 | ahci_platform_disable_clks(hpriv); | |
226 | ||
227 | disable_regulator: | |
c7d7ddee GC |
228 | ahci_platform_disable_regulators(hpriv); |
229 | ||
fd990556 BZ |
230 | return rc; |
231 | } | |
232 | EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); | |
233 | ||
234 | /** | |
235 | * ahci_platform_disable_resources - Disable platform resources | |
236 | * @hpriv: host private area to store config values | |
237 | * | |
238 | * This function disables all ahci_platform managed resources in the | |
239 | * following order: | |
b1a9edbd | 240 | * 1) Phys |
fd990556 | 241 | * 2) Clocks (through ahci_platform_disable_clks) |
fd17ed68 | 242 | * 3) Regulator |
fd990556 BZ |
243 | */ |
244 | void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) | |
245 | { | |
b1a9edbd | 246 | ahci_platform_disable_phys(hpriv); |
fd990556 BZ |
247 | |
248 | ahci_platform_disable_clks(hpriv); | |
249 | ||
c7d7ddee | 250 | ahci_platform_disable_regulators(hpriv); |
fd990556 BZ |
251 | } |
252 | EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); | |
253 | ||
254 | static void ahci_platform_put_resources(struct device *dev, void *res) | |
255 | { | |
256 | struct ahci_host_priv *hpriv = res; | |
257 | int c; | |
258 | ||
259 | if (hpriv->got_runtime_pm) { | |
260 | pm_runtime_put_sync(dev); | |
261 | pm_runtime_disable(dev); | |
262 | } | |
263 | ||
264 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) | |
265 | clk_put(hpriv->clks[c]); | |
c7d7ddee GC |
266 | /* |
267 | * The regulators are tied to child node device and not to the | |
268 | * SATA device itself. So we can't use devm for automatically | |
269 | * releasing them. We have to do it manually here. | |
270 | */ | |
271 | for (c = 0; c < hpriv->nports; c++) | |
272 | if (hpriv->target_pwrs && hpriv->target_pwrs[c]) | |
273 | regulator_put(hpriv->target_pwrs[c]); | |
274 | ||
55294150 | 275 | kfree(hpriv->target_pwrs); |
c7d7ddee GC |
276 | } |
277 | ||
278 | static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, | |
279 | struct device *dev, struct device_node *node) | |
280 | { | |
281 | int rc; | |
282 | ||
283 | hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); | |
284 | ||
285 | if (!IS_ERR(hpriv->phys[port])) | |
286 | return 0; | |
287 | ||
288 | rc = PTR_ERR(hpriv->phys[port]); | |
289 | switch (rc) { | |
290 | case -ENOSYS: | |
291 | /* No PHY support. Check if PHY is required. */ | |
292 | if (of_find_property(node, "phys", NULL)) { | |
293 | dev_err(dev, | |
294 | "couldn't get PHY in node %s: ENOSYS\n", | |
295 | node->name); | |
296 | break; | |
297 | } | |
05b83605 | 298 | /* fall through */ |
c7d7ddee GC |
299 | case -ENODEV: |
300 | /* continue normally */ | |
301 | hpriv->phys[port] = NULL; | |
302 | rc = 0; | |
303 | break; | |
304 | ||
305 | default: | |
306 | dev_err(dev, | |
307 | "couldn't get PHY in node %s: %d\n", | |
308 | node->name, rc); | |
309 | ||
310 | break; | |
311 | } | |
312 | ||
313 | return rc; | |
314 | } | |
315 | ||
316 | static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, | |
317 | struct device *dev) | |
318 | { | |
319 | struct regulator *target_pwr; | |
320 | int rc = 0; | |
321 | ||
322 | target_pwr = regulator_get_optional(dev, "target"); | |
323 | ||
324 | if (!IS_ERR(target_pwr)) | |
325 | hpriv->target_pwrs[port] = target_pwr; | |
326 | else | |
327 | rc = PTR_ERR(target_pwr); | |
328 | ||
329 | return rc; | |
fd990556 BZ |
330 | } |
331 | ||
332 | /** | |
333 | * ahci_platform_get_resources - Get platform resources | |
334 | * @pdev: platform device to get resources for | |
335 | * | |
336 | * This function allocates an ahci_host_priv struct, and gets the following | |
337 | * resources, storing a reference to them inside the returned struct: | |
338 | * | |
339 | * 1) mmio registers (IORESOURCE_MEM 0, mandatory) | |
340 | * 2) regulator for controlling the targets power (optional) | |
341 | * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, | |
342 | * or for non devicetree enabled platforms a single clock | |
9f2b51db | 343 | * 4) phys (optional) |
fd990556 BZ |
344 | * |
345 | * RETURNS: | |
346 | * The allocated ahci_host_priv on success, otherwise an ERR_PTR value | |
347 | */ | |
348 | struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev) | |
349 | { | |
350 | struct device *dev = &pdev->dev; | |
351 | struct ahci_host_priv *hpriv; | |
352 | struct clk *clk; | |
b1a9edbd | 353 | struct device_node *child; |
c7d7ddee | 354 | int i, sz, enabled_ports = 0, rc = -ENOMEM, child_nodes; |
b1a9edbd | 355 | u32 mask_port_map = 0; |
fd990556 BZ |
356 | |
357 | if (!devres_open_group(dev, NULL, GFP_KERNEL)) | |
358 | return ERR_PTR(-ENOMEM); | |
359 | ||
360 | hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), | |
361 | GFP_KERNEL); | |
362 | if (!hpriv) | |
363 | goto err_out; | |
364 | ||
365 | devres_add(dev, hpriv); | |
366 | ||
367 | hpriv->mmio = devm_ioremap_resource(dev, | |
368 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
369 | if (IS_ERR(hpriv->mmio)) { | |
370 | dev_err(dev, "no mmio space\n"); | |
371 | rc = PTR_ERR(hpriv->mmio); | |
372 | goto err_out; | |
373 | } | |
374 | ||
fd990556 BZ |
375 | for (i = 0; i < AHCI_MAX_CLKS; i++) { |
376 | /* | |
377 | * For now we must use clk_get(dev, NULL) for the first clock, | |
378 | * because some platforms (da850, spear13xx) are not yet | |
379 | * converted to use devicetree for clocks. For new platforms | |
380 | * this is equivalent to of_clk_get(dev->of_node, 0). | |
381 | */ | |
382 | if (i == 0) | |
383 | clk = clk_get(dev, NULL); | |
384 | else | |
385 | clk = of_clk_get(dev->of_node, i); | |
386 | ||
387 | if (IS_ERR(clk)) { | |
388 | rc = PTR_ERR(clk); | |
389 | if (rc == -EPROBE_DEFER) | |
390 | goto err_out; | |
391 | break; | |
392 | } | |
393 | hpriv->clks[i] = clk; | |
394 | } | |
395 | ||
c7d7ddee | 396 | hpriv->nports = child_nodes = of_get_child_count(dev->of_node); |
b1a9edbd | 397 | |
c7d7ddee GC |
398 | /* |
399 | * If no sub-node was found, we still need to set nports to | |
400 | * one in order to be able to use the | |
401 | * ahci_platform_[en|dis]able_[phys|regulators] functions. | |
402 | */ | |
403 | if (!child_nodes) | |
404 | hpriv->nports = 1; | |
405 | ||
406 | sz = hpriv->nports * sizeof(*hpriv->phys); | |
407 | hpriv->phys = devm_kzalloc(dev, sz, GFP_KERNEL); | |
408 | if (!hpriv->phys) { | |
409 | rc = -ENOMEM; | |
410 | goto err_out; | |
411 | } | |
412 | sz = hpriv->nports * sizeof(*hpriv->target_pwrs); | |
55294150 | 413 | hpriv->target_pwrs = kzalloc(sz, GFP_KERNEL); |
c7d7ddee GC |
414 | if (!hpriv->target_pwrs) { |
415 | rc = -ENOMEM; | |
416 | goto err_out; | |
417 | } | |
b1a9edbd | 418 | |
c7d7ddee | 419 | if (child_nodes) { |
b1a9edbd AT |
420 | for_each_child_of_node(dev->of_node, child) { |
421 | u32 port; | |
f627cfde | 422 | struct platform_device *port_dev __maybe_unused; |
b1a9edbd AT |
423 | |
424 | if (!of_device_is_available(child)) | |
425 | continue; | |
426 | ||
427 | if (of_property_read_u32(child, "reg", &port)) { | |
428 | rc = -EINVAL; | |
acbd5733 MP |
429 | goto err_out; |
430 | } | |
fd990556 | 431 | |
b1a9edbd AT |
432 | if (port >= hpriv->nports) { |
433 | dev_warn(dev, "invalid port number %d\n", port); | |
434 | continue; | |
435 | } | |
b1a9edbd AT |
436 | mask_port_map |= BIT(port); |
437 | ||
f627cfde | 438 | #ifdef CONFIG_OF_ADDRESS |
c7d7ddee GC |
439 | of_platform_device_create(child, NULL, NULL); |
440 | ||
441 | port_dev = of_find_device_by_node(child); | |
442 | ||
443 | if (port_dev) { | |
444 | rc = ahci_platform_get_regulator(hpriv, port, | |
445 | &port_dev->dev); | |
446 | if (rc == -EPROBE_DEFER) | |
447 | goto err_out; | |
b1a9edbd | 448 | } |
f627cfde | 449 | #endif |
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 | |
018d5ef2 | 496 | * @sht: scsi_host_template to use when registering |
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, | |
018d5ef2 AM |
507 | const struct ata_port_info *pi_template, |
508 | struct scsi_host_template *sht) | |
fd990556 BZ |
509 | { |
510 | struct device *dev = &pdev->dev; | |
511 | struct ata_port_info pi = *pi_template; | |
512 | const struct ata_port_info *ppi[] = { &pi, NULL }; | |
513 | struct ata_host *host; | |
514 | int i, irq, n_ports, rc; | |
515 | ||
516 | irq = platform_get_irq(pdev, 0); | |
517 | if (irq <= 0) { | |
c034640a TP |
518 | if (irq != -EPROBE_DEFER) |
519 | dev_err(dev, "no irq\n"); | |
520 | return irq; | |
fd990556 BZ |
521 | } |
522 | ||
21bfd1aa RR |
523 | hpriv->irq = irq; |
524 | ||
fd990556 | 525 | /* prepare host */ |
c4121c65 | 526 | pi.private_data = (void *)(unsigned long)hpriv->flags; |
fd990556 | 527 | |
725c7b57 | 528 | ahci_save_initial_config(dev, hpriv); |
fd990556 BZ |
529 | |
530 | if (hpriv->cap & HOST_CAP_NCQ) | |
531 | pi.flags |= ATA_FLAG_NCQ; | |
532 | ||
533 | if (hpriv->cap & HOST_CAP_PMP) | |
534 | pi.flags |= ATA_FLAG_PMP; | |
535 | ||
536 | ahci_set_em_messages(hpriv, &pi); | |
537 | ||
538 | /* CAP.NP sometimes indicate the index of the last enabled | |
539 | * port, at other times, that of the last possible port, so | |
540 | * determining the maximum port number requires looking at | |
541 | * both CAP.NP and port_map. | |
542 | */ | |
543 | n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); | |
544 | ||
545 | host = ata_host_alloc_pinfo(dev, ppi, n_ports); | |
546 | if (!host) | |
547 | return -ENOMEM; | |
548 | ||
549 | host->private_data = hpriv; | |
550 | ||
551 | if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) | |
552 | host->flags |= ATA_HOST_PARALLEL_SCAN; | |
553 | else | |
554 | dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); | |
555 | ||
556 | if (pi.flags & ATA_FLAG_EM) | |
557 | ahci_reset_em(host); | |
558 | ||
559 | for (i = 0; i < host->n_ports; i++) { | |
560 | struct ata_port *ap = host->ports[i]; | |
561 | ||
562 | ata_port_desc(ap, "mmio %pR", | |
563 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
564 | ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); | |
565 | ||
566 | /* set enclosure management message type */ | |
567 | if (ap->flags & ATA_FLAG_EM) | |
568 | ap->em_message_type = hpriv->em_msg_type; | |
569 | ||
570 | /* disabled/not-implemented port */ | |
571 | if (!(hpriv->port_map & (1 << i))) | |
572 | ap->ops = &ata_dummy_port_ops; | |
573 | } | |
574 | ||
cc7a9e27 SS |
575 | if (hpriv->cap & HOST_CAP_64) { |
576 | rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); | |
577 | if (rc) { | |
578 | rc = dma_coerce_mask_and_coherent(dev, | |
579 | DMA_BIT_MASK(32)); | |
580 | if (rc) { | |
581 | dev_err(dev, "Failed to enable 64-bit DMA.\n"); | |
582 | return rc; | |
583 | } | |
584 | dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); | |
585 | } | |
586 | } | |
587 | ||
fd990556 BZ |
588 | rc = ahci_reset_controller(host); |
589 | if (rc) | |
590 | return rc; | |
591 | ||
592 | ahci_init_controller(host); | |
593 | ahci_print_info(host, "platform"); | |
594 | ||
21bfd1aa | 595 | return ahci_host_activate(host, sht); |
fd990556 BZ |
596 | } |
597 | EXPORT_SYMBOL_GPL(ahci_platform_init_host); | |
598 | ||
599 | static void ahci_host_stop(struct ata_host *host) | |
600 | { | |
fd990556 BZ |
601 | struct ahci_host_priv *hpriv = host->private_data; |
602 | ||
fd990556 BZ |
603 | ahci_platform_disable_resources(hpriv); |
604 | } | |
605 | ||
8eede5bc NW |
606 | /** |
607 | * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports | |
608 | * @dev: platform device pointer for the host | |
609 | * | |
610 | * This function is called during system shutdown and performs the minimal | |
611 | * deconfiguration required to ensure that an ahci_platform host cannot | |
612 | * corrupt or otherwise interfere with a new kernel being started with kexec. | |
613 | */ | |
614 | void ahci_platform_shutdown(struct platform_device *pdev) | |
615 | { | |
616 | struct ata_host *host = platform_get_drvdata(pdev); | |
617 | struct ahci_host_priv *hpriv = host->private_data; | |
618 | void __iomem *mmio = hpriv->mmio; | |
619 | int i; | |
620 | ||
621 | for (i = 0; i < host->n_ports; i++) { | |
622 | struct ata_port *ap = host->ports[i]; | |
623 | ||
624 | /* Disable port interrupts */ | |
625 | if (ap->ops->freeze) | |
626 | ap->ops->freeze(ap); | |
627 | ||
628 | /* Stop the port DMA engines */ | |
629 | if (ap->ops->port_stop) | |
630 | ap->ops->port_stop(ap); | |
631 | } | |
632 | ||
633 | /* Disable and clear host interrupts */ | |
634 | writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); | |
635 | readl(mmio + HOST_CTL); /* flush */ | |
636 | writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); | |
637 | } | |
638 | EXPORT_SYMBOL_GPL(ahci_platform_shutdown); | |
639 | ||
fd990556 BZ |
640 | #ifdef CONFIG_PM_SLEEP |
641 | /** | |
642 | * ahci_platform_suspend_host - Suspend an ahci-platform host | |
643 | * @dev: device pointer for the host | |
644 | * | |
645 | * This function does all the usual steps needed to suspend an | |
b1a9edbd | 646 | * ahci-platform host, note any necessary resources (ie clks, phys, etc.) |
fd990556 BZ |
647 | * must be disabled after calling this. |
648 | * | |
649 | * RETURNS: | |
650 | * 0 on success otherwise a negative error code | |
651 | */ | |
652 | int ahci_platform_suspend_host(struct device *dev) | |
653 | { | |
654 | struct ata_host *host = dev_get_drvdata(dev); | |
655 | struct ahci_host_priv *hpriv = host->private_data; | |
656 | void __iomem *mmio = hpriv->mmio; | |
657 | u32 ctl; | |
658 | ||
659 | if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { | |
660 | dev_err(dev, "firmware update required for suspend/resume\n"); | |
661 | return -EIO; | |
662 | } | |
663 | ||
664 | /* | |
665 | * AHCI spec rev1.1 section 8.3.3: | |
666 | * Software must disable interrupts prior to requesting a | |
667 | * transition of the HBA to D3 state. | |
668 | */ | |
669 | ctl = readl(mmio + HOST_CTL); | |
670 | ctl &= ~HOST_IRQ_EN; | |
671 | writel(ctl, mmio + HOST_CTL); | |
672 | readl(mmio + HOST_CTL); /* flush */ | |
673 | ||
674 | return ata_host_suspend(host, PMSG_SUSPEND); | |
675 | } | |
676 | EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); | |
677 | ||
678 | /** | |
679 | * ahci_platform_resume_host - Resume an ahci-platform host | |
680 | * @dev: device pointer for the host | |
681 | * | |
682 | * This function does all the usual steps needed to resume an ahci-platform | |
b1a9edbd | 683 | * host, note any necessary resources (ie clks, phys, etc.) must be |
fd990556 BZ |
684 | * initialized / enabled before calling this. |
685 | * | |
686 | * RETURNS: | |
687 | * 0 on success otherwise a negative error code | |
688 | */ | |
689 | int ahci_platform_resume_host(struct device *dev) | |
690 | { | |
691 | struct ata_host *host = dev_get_drvdata(dev); | |
692 | int rc; | |
693 | ||
694 | if (dev->power.power_state.event == PM_EVENT_SUSPEND) { | |
695 | rc = ahci_reset_controller(host); | |
696 | if (rc) | |
697 | return rc; | |
698 | ||
699 | ahci_init_controller(host); | |
700 | } | |
701 | ||
702 | ata_host_resume(host); | |
703 | ||
704 | return 0; | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(ahci_platform_resume_host); | |
707 | ||
708 | /** | |
709 | * ahci_platform_suspend - Suspend an ahci-platform device | |
710 | * @dev: the platform device to suspend | |
711 | * | |
712 | * This function suspends the host associated with the device, followed by | |
713 | * disabling all the resources of the device. | |
714 | * | |
715 | * RETURNS: | |
716 | * 0 on success otherwise a negative error code | |
717 | */ | |
718 | int ahci_platform_suspend(struct device *dev) | |
719 | { | |
fd990556 BZ |
720 | struct ata_host *host = dev_get_drvdata(dev); |
721 | struct ahci_host_priv *hpriv = host->private_data; | |
722 | int rc; | |
723 | ||
724 | rc = ahci_platform_suspend_host(dev); | |
725 | if (rc) | |
726 | return rc; | |
727 | ||
fd990556 BZ |
728 | ahci_platform_disable_resources(hpriv); |
729 | ||
730 | return 0; | |
fd990556 BZ |
731 | } |
732 | EXPORT_SYMBOL_GPL(ahci_platform_suspend); | |
733 | ||
734 | /** | |
735 | * ahci_platform_resume - Resume an ahci-platform device | |
736 | * @dev: the platform device to resume | |
737 | * | |
738 | * This function enables all the resources of the device followed by | |
739 | * resuming the host associated with the device. | |
740 | * | |
741 | * RETURNS: | |
742 | * 0 on success otherwise a negative error code | |
743 | */ | |
744 | int ahci_platform_resume(struct device *dev) | |
745 | { | |
fd990556 BZ |
746 | struct ata_host *host = dev_get_drvdata(dev); |
747 | struct ahci_host_priv *hpriv = host->private_data; | |
748 | int rc; | |
749 | ||
750 | rc = ahci_platform_enable_resources(hpriv); | |
751 | if (rc) | |
752 | return rc; | |
753 | ||
fd990556 BZ |
754 | rc = ahci_platform_resume_host(dev); |
755 | if (rc) | |
756 | goto disable_resources; | |
757 | ||
758 | /* We resumed so update PM runtime state */ | |
759 | pm_runtime_disable(dev); | |
760 | pm_runtime_set_active(dev); | |
761 | pm_runtime_enable(dev); | |
762 | ||
763 | return 0; | |
764 | ||
765 | disable_resources: | |
766 | ahci_platform_disable_resources(hpriv); | |
767 | ||
768 | return rc; | |
769 | } | |
770 | EXPORT_SYMBOL_GPL(ahci_platform_resume); | |
771 | #endif | |
772 | ||
773 | MODULE_DESCRIPTION("AHCI SATA platform library"); | |
774 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | |
775 | MODULE_LICENSE("GPL"); |