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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 "ahci.h" | |
28 | ||
29 | static void ahci_host_stop(struct ata_host *host); | |
30 | ||
31 | struct ata_port_operations ahci_platform_ops = { | |
32 | .inherits = &ahci_ops, | |
33 | .host_stop = ahci_host_stop, | |
34 | }; | |
35 | EXPORT_SYMBOL_GPL(ahci_platform_ops); | |
36 | ||
37 | static struct scsi_host_template ahci_platform_sht = { | |
38 | AHCI_SHT("ahci_platform"), | |
39 | }; | |
40 | ||
41 | /** | |
42 | * ahci_platform_enable_clks - Enable platform clocks | |
43 | * @hpriv: host private area to store config values | |
44 | * | |
45 | * This function enables all the clks found in hpriv->clks, starting at | |
46 | * index 0. If any clk fails to enable it disables all the clks already | |
47 | * enabled in reverse order, and then returns an error. | |
48 | * | |
49 | * RETURNS: | |
50 | * 0 on success otherwise a negative error code | |
51 | */ | |
52 | int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) | |
53 | { | |
54 | int c, rc; | |
55 | ||
56 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { | |
57 | rc = clk_prepare_enable(hpriv->clks[c]); | |
58 | if (rc) | |
59 | goto disable_unprepare_clk; | |
60 | } | |
61 | return 0; | |
62 | ||
63 | disable_unprepare_clk: | |
64 | while (--c >= 0) | |
65 | clk_disable_unprepare(hpriv->clks[c]); | |
66 | return rc; | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); | |
69 | ||
70 | /** | |
71 | * ahci_platform_disable_clks - Disable platform clocks | |
72 | * @hpriv: host private area to store config values | |
73 | * | |
74 | * This function disables all the clks found in hpriv->clks, in reverse | |
75 | * order of ahci_platform_enable_clks (starting at the end of the array). | |
76 | */ | |
77 | void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) | |
78 | { | |
79 | int c; | |
80 | ||
81 | for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) | |
82 | if (hpriv->clks[c]) | |
83 | clk_disable_unprepare(hpriv->clks[c]); | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); | |
86 | ||
87 | /** | |
88 | * ahci_platform_enable_resources - Enable platform resources | |
89 | * @hpriv: host private area to store config values | |
90 | * | |
91 | * This function enables all ahci_platform managed resources in the | |
92 | * following order: | |
93 | * 1) Regulator | |
94 | * 2) Clocks (through ahci_platform_enable_clks) | |
95 | * 3) Phy | |
96 | * | |
97 | * If resource enabling fails at any point the previous enabled resources | |
98 | * are disabled in reverse order. | |
99 | * | |
100 | * RETURNS: | |
101 | * 0 on success otherwise a negative error code | |
102 | */ | |
103 | int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) | |
104 | { | |
105 | int rc; | |
106 | ||
107 | if (hpriv->target_pwr) { | |
108 | rc = regulator_enable(hpriv->target_pwr); | |
109 | if (rc) | |
110 | return rc; | |
111 | } | |
112 | ||
113 | rc = ahci_platform_enable_clks(hpriv); | |
114 | if (rc) | |
115 | goto disable_regulator; | |
116 | ||
117 | if (hpriv->phy) { | |
118 | rc = phy_init(hpriv->phy); | |
119 | if (rc) | |
120 | goto disable_clks; | |
121 | ||
122 | rc = phy_power_on(hpriv->phy); | |
123 | if (rc) { | |
124 | phy_exit(hpriv->phy); | |
125 | goto disable_clks; | |
126 | } | |
127 | } | |
128 | ||
129 | return 0; | |
130 | ||
131 | disable_clks: | |
132 | ahci_platform_disable_clks(hpriv); | |
133 | ||
134 | disable_regulator: | |
135 | if (hpriv->target_pwr) | |
136 | regulator_disable(hpriv->target_pwr); | |
137 | return rc; | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); | |
140 | ||
141 | /** | |
142 | * ahci_platform_disable_resources - Disable platform resources | |
143 | * @hpriv: host private area to store config values | |
144 | * | |
145 | * This function disables all ahci_platform managed resources in the | |
146 | * following order: | |
147 | * 1) Phy | |
148 | * 2) Clocks (through ahci_platform_disable_clks) | |
149 | * 3) Regulator | |
150 | */ | |
151 | void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) | |
152 | { | |
153 | if (hpriv->phy) { | |
154 | phy_power_off(hpriv->phy); | |
155 | phy_exit(hpriv->phy); | |
156 | } | |
157 | ||
158 | ahci_platform_disable_clks(hpriv); | |
159 | ||
160 | if (hpriv->target_pwr) | |
161 | regulator_disable(hpriv->target_pwr); | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); | |
164 | ||
165 | static void ahci_platform_put_resources(struct device *dev, void *res) | |
166 | { | |
167 | struct ahci_host_priv *hpriv = res; | |
168 | int c; | |
169 | ||
170 | if (hpriv->got_runtime_pm) { | |
171 | pm_runtime_put_sync(dev); | |
172 | pm_runtime_disable(dev); | |
173 | } | |
174 | ||
175 | for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) | |
176 | clk_put(hpriv->clks[c]); | |
177 | } | |
178 | ||
179 | /** | |
180 | * ahci_platform_get_resources - Get platform resources | |
181 | * @pdev: platform device to get resources for | |
182 | * | |
183 | * This function allocates an ahci_host_priv struct, and gets the following | |
184 | * resources, storing a reference to them inside the returned struct: | |
185 | * | |
186 | * 1) mmio registers (IORESOURCE_MEM 0, mandatory) | |
187 | * 2) regulator for controlling the targets power (optional) | |
188 | * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, | |
189 | * or for non devicetree enabled platforms a single clock | |
190 | * 4) phy (optional) | |
191 | * | |
192 | * RETURNS: | |
193 | * The allocated ahci_host_priv on success, otherwise an ERR_PTR value | |
194 | */ | |
195 | struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev) | |
196 | { | |
197 | struct device *dev = &pdev->dev; | |
198 | struct ahci_host_priv *hpriv; | |
199 | struct clk *clk; | |
200 | int i, rc = -ENOMEM; | |
201 | ||
202 | if (!devres_open_group(dev, NULL, GFP_KERNEL)) | |
203 | return ERR_PTR(-ENOMEM); | |
204 | ||
205 | hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), | |
206 | GFP_KERNEL); | |
207 | if (!hpriv) | |
208 | goto err_out; | |
209 | ||
210 | devres_add(dev, hpriv); | |
211 | ||
212 | hpriv->mmio = devm_ioremap_resource(dev, | |
213 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
214 | if (IS_ERR(hpriv->mmio)) { | |
215 | dev_err(dev, "no mmio space\n"); | |
216 | rc = PTR_ERR(hpriv->mmio); | |
217 | goto err_out; | |
218 | } | |
219 | ||
220 | hpriv->target_pwr = devm_regulator_get_optional(dev, "target"); | |
221 | if (IS_ERR(hpriv->target_pwr)) { | |
222 | rc = PTR_ERR(hpriv->target_pwr); | |
223 | if (rc == -EPROBE_DEFER) | |
224 | goto err_out; | |
225 | hpriv->target_pwr = NULL; | |
226 | } | |
227 | ||
228 | for (i = 0; i < AHCI_MAX_CLKS; i++) { | |
229 | /* | |
230 | * For now we must use clk_get(dev, NULL) for the first clock, | |
231 | * because some platforms (da850, spear13xx) are not yet | |
232 | * converted to use devicetree for clocks. For new platforms | |
233 | * this is equivalent to of_clk_get(dev->of_node, 0). | |
234 | */ | |
235 | if (i == 0) | |
236 | clk = clk_get(dev, NULL); | |
237 | else | |
238 | clk = of_clk_get(dev->of_node, i); | |
239 | ||
240 | if (IS_ERR(clk)) { | |
241 | rc = PTR_ERR(clk); | |
242 | if (rc == -EPROBE_DEFER) | |
243 | goto err_out; | |
244 | break; | |
245 | } | |
246 | hpriv->clks[i] = clk; | |
247 | } | |
248 | ||
249 | hpriv->phy = devm_phy_get(dev, "sata-phy"); | |
250 | if (IS_ERR(hpriv->phy)) { | |
251 | rc = PTR_ERR(hpriv->phy); | |
252 | switch (rc) { | |
253 | case -ENODEV: | |
254 | case -ENOSYS: | |
255 | /* continue normally */ | |
256 | hpriv->phy = NULL; | |
257 | break; | |
258 | ||
259 | case -EPROBE_DEFER: | |
260 | goto err_out; | |
261 | ||
262 | default: | |
263 | dev_err(dev, "couldn't get sata-phy\n"); | |
264 | goto err_out; | |
265 | } | |
266 | } | |
267 | ||
268 | pm_runtime_enable(dev); | |
269 | pm_runtime_get_sync(dev); | |
270 | hpriv->got_runtime_pm = true; | |
271 | ||
272 | devres_remove_group(dev, NULL); | |
273 | return hpriv; | |
274 | ||
275 | err_out: | |
276 | devres_release_group(dev, NULL); | |
277 | return ERR_PTR(rc); | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(ahci_platform_get_resources); | |
280 | ||
281 | /** | |
282 | * ahci_platform_init_host - Bring up an ahci-platform host | |
283 | * @pdev: platform device pointer for the host | |
284 | * @hpriv: ahci-host private data for the host | |
285 | * @pi_template: template for the ata_port_info to use | |
286 | * @force_port_map: param passed to ahci_save_initial_config | |
287 | * @mask_port_map: param passed to ahci_save_initial_config | |
288 | * | |
289 | * This function does all the usual steps needed to bring up an | |
290 | * ahci-platform host, note any necessary resources (ie clks, phy, etc.) | |
291 | * must be initialized / enabled before calling this. | |
292 | * | |
293 | * RETURNS: | |
294 | * 0 on success otherwise a negative error code | |
295 | */ | |
296 | int ahci_platform_init_host(struct platform_device *pdev, | |
297 | struct ahci_host_priv *hpriv, | |
298 | const struct ata_port_info *pi_template, | |
299 | unsigned int force_port_map, | |
300 | unsigned int mask_port_map) | |
301 | { | |
302 | struct device *dev = &pdev->dev; | |
303 | struct ata_port_info pi = *pi_template; | |
304 | const struct ata_port_info *ppi[] = { &pi, NULL }; | |
305 | struct ata_host *host; | |
306 | int i, irq, n_ports, rc; | |
307 | ||
308 | irq = platform_get_irq(pdev, 0); | |
309 | if (irq <= 0) { | |
310 | dev_err(dev, "no irq\n"); | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | /* prepare host */ | |
315 | hpriv->flags |= (unsigned long)pi.private_data; | |
316 | ||
317 | ahci_save_initial_config(dev, hpriv, force_port_map, mask_port_map); | |
318 | ||
319 | if (hpriv->cap & HOST_CAP_NCQ) | |
320 | pi.flags |= ATA_FLAG_NCQ; | |
321 | ||
322 | if (hpriv->cap & HOST_CAP_PMP) | |
323 | pi.flags |= ATA_FLAG_PMP; | |
324 | ||
325 | ahci_set_em_messages(hpriv, &pi); | |
326 | ||
327 | /* CAP.NP sometimes indicate the index of the last enabled | |
328 | * port, at other times, that of the last possible port, so | |
329 | * determining the maximum port number requires looking at | |
330 | * both CAP.NP and port_map. | |
331 | */ | |
332 | n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); | |
333 | ||
334 | host = ata_host_alloc_pinfo(dev, ppi, n_ports); | |
335 | if (!host) | |
336 | return -ENOMEM; | |
337 | ||
338 | host->private_data = hpriv; | |
339 | ||
340 | if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) | |
341 | host->flags |= ATA_HOST_PARALLEL_SCAN; | |
342 | else | |
343 | dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); | |
344 | ||
345 | if (pi.flags & ATA_FLAG_EM) | |
346 | ahci_reset_em(host); | |
347 | ||
348 | for (i = 0; i < host->n_ports; i++) { | |
349 | struct ata_port *ap = host->ports[i]; | |
350 | ||
351 | ata_port_desc(ap, "mmio %pR", | |
352 | platform_get_resource(pdev, IORESOURCE_MEM, 0)); | |
353 | ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); | |
354 | ||
355 | /* set enclosure management message type */ | |
356 | if (ap->flags & ATA_FLAG_EM) | |
357 | ap->em_message_type = hpriv->em_msg_type; | |
358 | ||
359 | /* disabled/not-implemented port */ | |
360 | if (!(hpriv->port_map & (1 << i))) | |
361 | ap->ops = &ata_dummy_port_ops; | |
362 | } | |
363 | ||
364 | rc = ahci_reset_controller(host); | |
365 | if (rc) | |
366 | return rc; | |
367 | ||
368 | ahci_init_controller(host); | |
369 | ahci_print_info(host, "platform"); | |
370 | ||
371 | return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED, | |
372 | &ahci_platform_sht); | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(ahci_platform_init_host); | |
375 | ||
376 | static void ahci_host_stop(struct ata_host *host) | |
377 | { | |
378 | struct device *dev = host->dev; | |
379 | struct ahci_platform_data *pdata = dev_get_platdata(dev); | |
380 | struct ahci_host_priv *hpriv = host->private_data; | |
381 | ||
382 | if (pdata && pdata->exit) | |
383 | pdata->exit(dev); | |
384 | ||
385 | ahci_platform_disable_resources(hpriv); | |
386 | } | |
387 | ||
388 | #ifdef CONFIG_PM_SLEEP | |
389 | /** | |
390 | * ahci_platform_suspend_host - Suspend an ahci-platform host | |
391 | * @dev: device pointer for the host | |
392 | * | |
393 | * This function does all the usual steps needed to suspend an | |
394 | * ahci-platform host, note any necessary resources (ie clks, phy, etc.) | |
395 | * must be disabled after calling this. | |
396 | * | |
397 | * RETURNS: | |
398 | * 0 on success otherwise a negative error code | |
399 | */ | |
400 | int ahci_platform_suspend_host(struct device *dev) | |
401 | { | |
402 | struct ata_host *host = dev_get_drvdata(dev); | |
403 | struct ahci_host_priv *hpriv = host->private_data; | |
404 | void __iomem *mmio = hpriv->mmio; | |
405 | u32 ctl; | |
406 | ||
407 | if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { | |
408 | dev_err(dev, "firmware update required for suspend/resume\n"); | |
409 | return -EIO; | |
410 | } | |
411 | ||
412 | /* | |
413 | * AHCI spec rev1.1 section 8.3.3: | |
414 | * Software must disable interrupts prior to requesting a | |
415 | * transition of the HBA to D3 state. | |
416 | */ | |
417 | ctl = readl(mmio + HOST_CTL); | |
418 | ctl &= ~HOST_IRQ_EN; | |
419 | writel(ctl, mmio + HOST_CTL); | |
420 | readl(mmio + HOST_CTL); /* flush */ | |
421 | ||
422 | return ata_host_suspend(host, PMSG_SUSPEND); | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); | |
425 | ||
426 | /** | |
427 | * ahci_platform_resume_host - Resume an ahci-platform host | |
428 | * @dev: device pointer for the host | |
429 | * | |
430 | * This function does all the usual steps needed to resume an ahci-platform | |
431 | * host, note any necessary resources (ie clks, phy, etc.) must be | |
432 | * initialized / enabled before calling this. | |
433 | * | |
434 | * RETURNS: | |
435 | * 0 on success otherwise a negative error code | |
436 | */ | |
437 | int ahci_platform_resume_host(struct device *dev) | |
438 | { | |
439 | struct ata_host *host = dev_get_drvdata(dev); | |
440 | int rc; | |
441 | ||
442 | if (dev->power.power_state.event == PM_EVENT_SUSPEND) { | |
443 | rc = ahci_reset_controller(host); | |
444 | if (rc) | |
445 | return rc; | |
446 | ||
447 | ahci_init_controller(host); | |
448 | } | |
449 | ||
450 | ata_host_resume(host); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(ahci_platform_resume_host); | |
455 | ||
456 | /** | |
457 | * ahci_platform_suspend - Suspend an ahci-platform device | |
458 | * @dev: the platform device to suspend | |
459 | * | |
460 | * This function suspends the host associated with the device, followed by | |
461 | * disabling all the resources of the device. | |
462 | * | |
463 | * RETURNS: | |
464 | * 0 on success otherwise a negative error code | |
465 | */ | |
466 | int ahci_platform_suspend(struct device *dev) | |
467 | { | |
468 | struct ahci_platform_data *pdata = dev_get_platdata(dev); | |
469 | struct ata_host *host = dev_get_drvdata(dev); | |
470 | struct ahci_host_priv *hpriv = host->private_data; | |
471 | int rc; | |
472 | ||
473 | rc = ahci_platform_suspend_host(dev); | |
474 | if (rc) | |
475 | return rc; | |
476 | ||
477 | if (pdata && pdata->suspend) { | |
478 | rc = pdata->suspend(dev); | |
479 | if (rc) | |
480 | goto resume_host; | |
481 | } | |
482 | ||
483 | ahci_platform_disable_resources(hpriv); | |
484 | ||
485 | return 0; | |
486 | ||
487 | resume_host: | |
488 | ahci_platform_resume_host(dev); | |
489 | return rc; | |
490 | } | |
491 | EXPORT_SYMBOL_GPL(ahci_platform_suspend); | |
492 | ||
493 | /** | |
494 | * ahci_platform_resume - Resume an ahci-platform device | |
495 | * @dev: the platform device to resume | |
496 | * | |
497 | * This function enables all the resources of the device followed by | |
498 | * resuming the host associated with the device. | |
499 | * | |
500 | * RETURNS: | |
501 | * 0 on success otherwise a negative error code | |
502 | */ | |
503 | int ahci_platform_resume(struct device *dev) | |
504 | { | |
505 | struct ahci_platform_data *pdata = dev_get_platdata(dev); | |
506 | struct ata_host *host = dev_get_drvdata(dev); | |
507 | struct ahci_host_priv *hpriv = host->private_data; | |
508 | int rc; | |
509 | ||
510 | rc = ahci_platform_enable_resources(hpriv); | |
511 | if (rc) | |
512 | return rc; | |
513 | ||
514 | if (pdata && pdata->resume) { | |
515 | rc = pdata->resume(dev); | |
516 | if (rc) | |
517 | goto disable_resources; | |
518 | } | |
519 | ||
520 | rc = ahci_platform_resume_host(dev); | |
521 | if (rc) | |
522 | goto disable_resources; | |
523 | ||
524 | /* We resumed so update PM runtime state */ | |
525 | pm_runtime_disable(dev); | |
526 | pm_runtime_set_active(dev); | |
527 | pm_runtime_enable(dev); | |
528 | ||
529 | return 0; | |
530 | ||
531 | disable_resources: | |
532 | ahci_platform_disable_resources(hpriv); | |
533 | ||
534 | return rc; | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(ahci_platform_resume); | |
537 | #endif | |
538 | ||
539 | MODULE_DESCRIPTION("AHCI SATA platform library"); | |
540 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | |
541 | MODULE_LICENSE("GPL"); |