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Bartlomiej Zolnierkiewiczfd990552014-03-25 19:51:39 +01001/*
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
29static void ahci_host_stop(struct ata_host *host);
30
31struct ata_port_operations ahci_platform_ops = {
32 .inherits = &ahci_ops,
33 .host_stop = ahci_host_stop,
34};
35EXPORT_SYMBOL_GPL(ahci_platform_ops);
36
37static 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 */
52int 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
63disable_unprepare_clk:
64 while (--c >= 0)
65 clk_disable_unprepare(hpriv->clks[c]);
66 return rc;
67}
68EXPORT_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 */
77void 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}
85EXPORT_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 */
103int 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
131disable_clks:
132 ahci_platform_disable_clks(hpriv);
133
134disable_regulator:
135 if (hpriv->target_pwr)
136 regulator_disable(hpriv->target_pwr);
137 return rc;
138}
139EXPORT_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 */
151void 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}
163EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
164
165static 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 */
195struct 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
275err_out:
276 devres_release_group(dev, NULL);
277 return ERR_PTR(rc);
278}
279EXPORT_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
Kefeng Wangf9f36912014-05-14 14:13:41 +0800286 * @host_flags: ahci host flags used in ahci_host_priv
Bartlomiej Zolnierkiewiczfd990552014-03-25 19:51:39 +0100287 * @force_port_map: param passed to ahci_save_initial_config
288 * @mask_port_map: param passed to ahci_save_initial_config
289 *
290 * This function does all the usual steps needed to bring up an
291 * ahci-platform host, note any necessary resources (ie clks, phy, etc.)
292 * must be initialized / enabled before calling this.
293 *
294 * RETURNS:
295 * 0 on success otherwise a negative error code
296 */
297int ahci_platform_init_host(struct platform_device *pdev,
298 struct ahci_host_priv *hpriv,
299 const struct ata_port_info *pi_template,
Kefeng Wangf9f36912014-05-14 14:13:41 +0800300 unsigned long host_flags,
Bartlomiej Zolnierkiewiczfd990552014-03-25 19:51:39 +0100301 unsigned int force_port_map,
302 unsigned int mask_port_map)
303{
304 struct device *dev = &pdev->dev;
305 struct ata_port_info pi = *pi_template;
306 const struct ata_port_info *ppi[] = { &pi, NULL };
307 struct ata_host *host;
308 int i, irq, n_ports, rc;
309
310 irq = platform_get_irq(pdev, 0);
311 if (irq <= 0) {
312 dev_err(dev, "no irq\n");
313 return -EINVAL;
314 }
315
316 /* prepare host */
Kefeng Wangf9f36912014-05-14 14:13:41 +0800317 pi.private_data = (void *)host_flags;
318 hpriv->flags |= host_flags;
Bartlomiej Zolnierkiewiczfd990552014-03-25 19:51:39 +0100319
320 ahci_save_initial_config(dev, hpriv, force_port_map, mask_port_map);
321
322 if (hpriv->cap & HOST_CAP_NCQ)
323 pi.flags |= ATA_FLAG_NCQ;
324
325 if (hpriv->cap & HOST_CAP_PMP)
326 pi.flags |= ATA_FLAG_PMP;
327
328 ahci_set_em_messages(hpriv, &pi);
329
330 /* CAP.NP sometimes indicate the index of the last enabled
331 * port, at other times, that of the last possible port, so
332 * determining the maximum port number requires looking at
333 * both CAP.NP and port_map.
334 */
335 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
336
337 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
338 if (!host)
339 return -ENOMEM;
340
341 host->private_data = hpriv;
342
343 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
344 host->flags |= ATA_HOST_PARALLEL_SCAN;
345 else
346 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
347
348 if (pi.flags & ATA_FLAG_EM)
349 ahci_reset_em(host);
350
351 for (i = 0; i < host->n_ports; i++) {
352 struct ata_port *ap = host->ports[i];
353
354 ata_port_desc(ap, "mmio %pR",
355 platform_get_resource(pdev, IORESOURCE_MEM, 0));
356 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
357
358 /* set enclosure management message type */
359 if (ap->flags & ATA_FLAG_EM)
360 ap->em_message_type = hpriv->em_msg_type;
361
362 /* disabled/not-implemented port */
363 if (!(hpriv->port_map & (1 << i)))
364 ap->ops = &ata_dummy_port_ops;
365 }
366
367 rc = ahci_reset_controller(host);
368 if (rc)
369 return rc;
370
371 ahci_init_controller(host);
372 ahci_print_info(host, "platform");
373
374 return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
375 &ahci_platform_sht);
376}
377EXPORT_SYMBOL_GPL(ahci_platform_init_host);
378
379static void ahci_host_stop(struct ata_host *host)
380{
381 struct device *dev = host->dev;
382 struct ahci_platform_data *pdata = dev_get_platdata(dev);
383 struct ahci_host_priv *hpriv = host->private_data;
384
385 if (pdata && pdata->exit)
386 pdata->exit(dev);
387
388 ahci_platform_disable_resources(hpriv);
389}
390
391#ifdef CONFIG_PM_SLEEP
392/**
393 * ahci_platform_suspend_host - Suspend an ahci-platform host
394 * @dev: device pointer for the host
395 *
396 * This function does all the usual steps needed to suspend an
397 * ahci-platform host, note any necessary resources (ie clks, phy, etc.)
398 * must be disabled after calling this.
399 *
400 * RETURNS:
401 * 0 on success otherwise a negative error code
402 */
403int ahci_platform_suspend_host(struct device *dev)
404{
405 struct ata_host *host = dev_get_drvdata(dev);
406 struct ahci_host_priv *hpriv = host->private_data;
407 void __iomem *mmio = hpriv->mmio;
408 u32 ctl;
409
410 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
411 dev_err(dev, "firmware update required for suspend/resume\n");
412 return -EIO;
413 }
414
415 /*
416 * AHCI spec rev1.1 section 8.3.3:
417 * Software must disable interrupts prior to requesting a
418 * transition of the HBA to D3 state.
419 */
420 ctl = readl(mmio + HOST_CTL);
421 ctl &= ~HOST_IRQ_EN;
422 writel(ctl, mmio + HOST_CTL);
423 readl(mmio + HOST_CTL); /* flush */
424
425 return ata_host_suspend(host, PMSG_SUSPEND);
426}
427EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
428
429/**
430 * ahci_platform_resume_host - Resume an ahci-platform host
431 * @dev: device pointer for the host
432 *
433 * This function does all the usual steps needed to resume an ahci-platform
434 * host, note any necessary resources (ie clks, phy, etc.) must be
435 * initialized / enabled before calling this.
436 *
437 * RETURNS:
438 * 0 on success otherwise a negative error code
439 */
440int ahci_platform_resume_host(struct device *dev)
441{
442 struct ata_host *host = dev_get_drvdata(dev);
443 int rc;
444
445 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
446 rc = ahci_reset_controller(host);
447 if (rc)
448 return rc;
449
450 ahci_init_controller(host);
451 }
452
453 ata_host_resume(host);
454
455 return 0;
456}
457EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
458
459/**
460 * ahci_platform_suspend - Suspend an ahci-platform device
461 * @dev: the platform device to suspend
462 *
463 * This function suspends the host associated with the device, followed by
464 * disabling all the resources of the device.
465 *
466 * RETURNS:
467 * 0 on success otherwise a negative error code
468 */
469int ahci_platform_suspend(struct device *dev)
470{
471 struct ahci_platform_data *pdata = dev_get_platdata(dev);
472 struct ata_host *host = dev_get_drvdata(dev);
473 struct ahci_host_priv *hpriv = host->private_data;
474 int rc;
475
476 rc = ahci_platform_suspend_host(dev);
477 if (rc)
478 return rc;
479
480 if (pdata && pdata->suspend) {
481 rc = pdata->suspend(dev);
482 if (rc)
483 goto resume_host;
484 }
485
486 ahci_platform_disable_resources(hpriv);
487
488 return 0;
489
490resume_host:
491 ahci_platform_resume_host(dev);
492 return rc;
493}
494EXPORT_SYMBOL_GPL(ahci_platform_suspend);
495
496/**
497 * ahci_platform_resume - Resume an ahci-platform device
498 * @dev: the platform device to resume
499 *
500 * This function enables all the resources of the device followed by
501 * resuming the host associated with the device.
502 *
503 * RETURNS:
504 * 0 on success otherwise a negative error code
505 */
506int ahci_platform_resume(struct device *dev)
507{
508 struct ahci_platform_data *pdata = dev_get_platdata(dev);
509 struct ata_host *host = dev_get_drvdata(dev);
510 struct ahci_host_priv *hpriv = host->private_data;
511 int rc;
512
513 rc = ahci_platform_enable_resources(hpriv);
514 if (rc)
515 return rc;
516
517 if (pdata && pdata->resume) {
518 rc = pdata->resume(dev);
519 if (rc)
520 goto disable_resources;
521 }
522
523 rc = ahci_platform_resume_host(dev);
524 if (rc)
525 goto disable_resources;
526
527 /* We resumed so update PM runtime state */
528 pm_runtime_disable(dev);
529 pm_runtime_set_active(dev);
530 pm_runtime_enable(dev);
531
532 return 0;
533
534disable_resources:
535 ahci_platform_disable_resources(hpriv);
536
537 return rc;
538}
539EXPORT_SYMBOL_GPL(ahci_platform_resume);
540#endif
541
542MODULE_DESCRIPTION("AHCI SATA platform library");
543MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
544MODULE_LICENSE("GPL");