blob: 54eaf96ab217272a53579454dd297bfa60d1e55e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/common/amba.c
3 *
4 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/device.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080013#include <linux/string.h>
14#include <linux/slab.h>
Russell King934848d2009-01-08 09:58:51 +000015#include <linux/io.h>
Rabin Vincentba74ec72011-02-23 04:33:17 +010016#include <linux/pm.h>
17#include <linux/pm_runtime.h>
Russell Kinga62c80e2006-01-07 13:52:45 +000018#include <linux/amba/bus.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Russell King934848d2009-01-08 09:58:51 +000020#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/sizes.h>
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
24
Russell Kingc862aab2011-02-19 15:55:26 +000025static const struct amba_id *
26amba_lookup(const struct amba_id *table, struct amba_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
28 int ret = 0;
29
30 while (table->mask) {
31 ret = (dev->periphid & table->mask) == table->id;
32 if (ret)
33 break;
34 table++;
35 }
36
37 return ret ? table : NULL;
38}
39
40static int amba_match(struct device *dev, struct device_driver *drv)
41{
42 struct amba_device *pcdev = to_amba_device(dev);
43 struct amba_driver *pcdrv = to_amba_driver(drv);
44
45 return amba_lookup(pcdrv->id_table, pcdev) != NULL;
46}
47
48#ifdef CONFIG_HOTPLUG
Kay Sievers7eff2e72007-08-14 15:15:12 +020049static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 struct amba_device *pcdev = to_amba_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +020052 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Kay Sievers7eff2e72007-08-14 15:15:12 +020054 retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
Dave Martin523817b2011-10-05 14:44:57 +010055 if (retval)
56 return retval;
57
58 retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
Eric Rannaudbf624562007-03-30 22:23:12 -070059 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060}
61#else
Paul Jackson6d20b032005-11-25 20:04:26 -080062#define amba_uevent NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#endif
64
Russell King96b13f52006-11-30 14:04:49 +000065#define amba_attr_func(name,fmt,arg...) \
66static ssize_t name##_show(struct device *_dev, \
67 struct device_attribute *attr, char *buf) \
68{ \
69 struct amba_device *dev = to_amba_device(_dev); \
70 return sprintf(buf, fmt, arg); \
71}
72
73#define amba_attr(name,fmt,arg...) \
74amba_attr_func(name,fmt,arg) \
75static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
76
77amba_attr_func(id, "%08x\n", dev->periphid);
78amba_attr(irq0, "%u\n", dev->irq[0]);
79amba_attr(irq1, "%u\n", dev->irq[1]);
80amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
81 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
82 dev->res.flags);
83
84static struct device_attribute amba_dev_attrs[] = {
85 __ATTR_RO(id),
86 __ATTR_RO(resource),
87 __ATTR_NULL,
88};
89
Rabin Vincentba74ec72011-02-23 04:33:17 +010090#ifdef CONFIG_PM_SLEEP
91
92static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
93{
94 struct amba_driver *adrv = to_amba_driver(dev->driver);
95 struct amba_device *adev = to_amba_device(dev);
96 int ret = 0;
97
98 if (dev->driver && adrv->suspend)
99 ret = adrv->suspend(adev, mesg);
100
101 return ret;
102}
103
104static int amba_legacy_resume(struct device *dev)
105{
106 struct amba_driver *adrv = to_amba_driver(dev->driver);
107 struct amba_device *adev = to_amba_device(dev);
108 int ret = 0;
109
110 if (dev->driver && adrv->resume)
111 ret = adrv->resume(adev);
112
113 return ret;
114}
115
Rafael J. Wysocki8114ab72011-12-18 00:34:31 +0100116#endif /* CONFIG_PM_SLEEP */
Rabin Vincentba74ec72011-02-23 04:33:17 +0100117
118#ifdef CONFIG_SUSPEND
119
120static int amba_pm_suspend(struct device *dev)
121{
122 struct device_driver *drv = dev->driver;
123 int ret = 0;
124
125 if (!drv)
126 return 0;
127
128 if (drv->pm) {
129 if (drv->pm->suspend)
130 ret = drv->pm->suspend(dev);
131 } else {
132 ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
133 }
134
135 return ret;
136}
137
Rabin Vincentba74ec72011-02-23 04:33:17 +0100138static int amba_pm_resume(struct device *dev)
139{
140 struct device_driver *drv = dev->driver;
141 int ret = 0;
142
143 if (!drv)
144 return 0;
145
146 if (drv->pm) {
147 if (drv->pm->resume)
148 ret = drv->pm->resume(dev);
149 } else {
150 ret = amba_legacy_resume(dev);
151 }
152
153 return ret;
154}
155
Rabin Vincentba74ec72011-02-23 04:33:17 +0100156#else /* !CONFIG_SUSPEND */
157
158#define amba_pm_suspend NULL
159#define amba_pm_resume NULL
Rabin Vincentba74ec72011-02-23 04:33:17 +0100160
161#endif /* !CONFIG_SUSPEND */
162
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200163#ifdef CONFIG_HIBERNATE_CALLBACKS
Rabin Vincentba74ec72011-02-23 04:33:17 +0100164
165static int amba_pm_freeze(struct device *dev)
166{
167 struct device_driver *drv = dev->driver;
168 int ret = 0;
169
170 if (!drv)
171 return 0;
172
173 if (drv->pm) {
174 if (drv->pm->freeze)
175 ret = drv->pm->freeze(dev);
176 } else {
177 ret = amba_legacy_suspend(dev, PMSG_FREEZE);
178 }
179
180 return ret;
181}
182
Rabin Vincentba74ec72011-02-23 04:33:17 +0100183static int amba_pm_thaw(struct device *dev)
184{
185 struct device_driver *drv = dev->driver;
186 int ret = 0;
187
188 if (!drv)
189 return 0;
190
191 if (drv->pm) {
192 if (drv->pm->thaw)
193 ret = drv->pm->thaw(dev);
194 } else {
195 ret = amba_legacy_resume(dev);
196 }
197
198 return ret;
199}
200
Rabin Vincentba74ec72011-02-23 04:33:17 +0100201static int amba_pm_poweroff(struct device *dev)
202{
203 struct device_driver *drv = dev->driver;
204 int ret = 0;
205
206 if (!drv)
207 return 0;
208
209 if (drv->pm) {
210 if (drv->pm->poweroff)
211 ret = drv->pm->poweroff(dev);
212 } else {
213 ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
214 }
215
216 return ret;
217}
218
Rabin Vincentba74ec72011-02-23 04:33:17 +0100219static int amba_pm_restore(struct device *dev)
220{
221 struct device_driver *drv = dev->driver;
222 int ret = 0;
223
224 if (!drv)
225 return 0;
226
227 if (drv->pm) {
228 if (drv->pm->restore)
229 ret = drv->pm->restore(dev);
230 } else {
231 ret = amba_legacy_resume(dev);
232 }
233
234 return ret;
235}
236
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200237#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rabin Vincentba74ec72011-02-23 04:33:17 +0100238
239#define amba_pm_freeze NULL
240#define amba_pm_thaw NULL
241#define amba_pm_poweroff NULL
242#define amba_pm_restore NULL
Rabin Vincentba74ec72011-02-23 04:33:17 +0100243
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200244#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rabin Vincentba74ec72011-02-23 04:33:17 +0100245
Russell King92b97f02011-08-14 09:13:48 +0100246#ifdef CONFIG_PM_RUNTIME
247/*
248 * Hooks to provide runtime PM of the pclk (bus clock). It is safe to
249 * enable/disable the bus clock at runtime PM suspend/resume as this
250 * does not result in loss of context. However, disabling vcore power
251 * would do, so we leave that to the driver.
252 */
253static int amba_pm_runtime_suspend(struct device *dev)
254{
255 struct amba_device *pcdev = to_amba_device(dev);
256 int ret = pm_generic_runtime_suspend(dev);
257
258 if (ret == 0 && dev->driver)
259 clk_disable(pcdev->pclk);
260
261 return ret;
262}
263
264static int amba_pm_runtime_resume(struct device *dev)
265{
266 struct amba_device *pcdev = to_amba_device(dev);
267 int ret;
268
269 if (dev->driver) {
270 ret = clk_enable(pcdev->pclk);
271 /* Failure is probably fatal to the system, but... */
272 if (ret)
273 return ret;
274 }
275
276 return pm_generic_runtime_resume(dev);
277}
278#endif
279
Rabin Vincentba74ec72011-02-23 04:33:17 +0100280#ifdef CONFIG_PM
281
282static const struct dev_pm_ops amba_pm = {
Rabin Vincentba74ec72011-02-23 04:33:17 +0100283 .suspend = amba_pm_suspend,
284 .resume = amba_pm_resume,
285 .freeze = amba_pm_freeze,
286 .thaw = amba_pm_thaw,
287 .poweroff = amba_pm_poweroff,
288 .restore = amba_pm_restore,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100289 SET_RUNTIME_PM_OPS(
Russell King92b97f02011-08-14 09:13:48 +0100290 amba_pm_runtime_suspend,
291 amba_pm_runtime_resume,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100292 pm_generic_runtime_idle
293 )
294};
295
296#define AMBA_PM (&amba_pm)
297
298#else /* !CONFIG_PM */
299
300#define AMBA_PM NULL
301
302#endif /* !CONFIG_PM */
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304/*
305 * Primecells are part of the Advanced Microcontroller Bus Architecture,
306 * so we call the bus "amba".
307 */
Rob Herring394d5ae2011-02-12 15:58:25 +0100308struct bus_type amba_bustype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 .name = "amba",
Russell King96b13f52006-11-30 14:04:49 +0000310 .dev_attrs = amba_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 .match = amba_match,
Paul Jackson6d20b032005-11-25 20:04:26 -0800312 .uevent = amba_uevent,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100313 .pm = AMBA_PM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314};
315
316static int __init amba_init(void)
317{
318 return bus_register(&amba_bustype);
319}
320
321postcore_initcall(amba_init);
322
Russell King7cfe2492010-07-15 10:47:14 +0100323static int amba_get_enable_pclk(struct amba_device *pcdev)
324{
325 struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
326 int ret;
327
328 pcdev->pclk = pclk;
329
330 if (IS_ERR(pclk))
331 return PTR_ERR(pclk);
332
Russell Kingac3e2fa2011-09-22 12:20:55 +0100333 ret = clk_prepare(pclk);
334 if (ret) {
Russell King7cfe2492010-07-15 10:47:14 +0100335 clk_put(pclk);
Russell Kingac3e2fa2011-09-22 12:20:55 +0100336 return ret;
337 }
338
339 ret = clk_enable(pclk);
340 if (ret) {
341 clk_unprepare(pclk);
342 clk_put(pclk);
343 }
Russell King7cfe2492010-07-15 10:47:14 +0100344
345 return ret;
346}
347
348static void amba_put_disable_pclk(struct amba_device *pcdev)
349{
350 struct clk *pclk = pcdev->pclk;
351
352 clk_disable(pclk);
Russell Kingac3e2fa2011-09-22 12:20:55 +0100353 clk_unprepare(pclk);
Russell King7cfe2492010-07-15 10:47:14 +0100354 clk_put(pclk);
355}
356
Linus Walleij65500fa2010-11-04 13:06:59 +0100357static int amba_get_enable_vcore(struct amba_device *pcdev)
358{
359 struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
360 int ret;
361
362 pcdev->vcore = vcore;
363
364 if (IS_ERR(vcore)) {
365 /* It is OK not to supply a vcore regulator */
366 if (PTR_ERR(vcore) == -ENODEV)
367 return 0;
368 return PTR_ERR(vcore);
369 }
370
371 ret = regulator_enable(vcore);
372 if (ret) {
373 regulator_put(vcore);
374 pcdev->vcore = ERR_PTR(-ENODEV);
375 }
376
377 return ret;
378}
379
380static void amba_put_disable_vcore(struct amba_device *pcdev)
381{
382 struct regulator *vcore = pcdev->vcore;
383
384 if (!IS_ERR(vcore)) {
385 regulator_disable(vcore);
386 regulator_put(vcore);
387 }
388}
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390/*
391 * These are the device model conversion veneers; they convert the
392 * device model structures to our more specific structures.
393 */
394static int amba_probe(struct device *dev)
395{
396 struct amba_device *pcdev = to_amba_device(dev);
397 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
Russell Kingc862aab2011-02-19 15:55:26 +0000398 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100399 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Russell King7cfe2492010-07-15 10:47:14 +0100401 do {
Linus Walleij65500fa2010-11-04 13:06:59 +0100402 ret = amba_get_enable_vcore(pcdev);
403 if (ret)
404 break;
405
Russell King7cfe2492010-07-15 10:47:14 +0100406 ret = amba_get_enable_pclk(pcdev);
407 if (ret)
408 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Russell King92b97f02011-08-14 09:13:48 +0100410 pm_runtime_get_noresume(dev);
411 pm_runtime_set_active(dev);
412 pm_runtime_enable(dev);
413
Russell King7cfe2492010-07-15 10:47:14 +0100414 ret = pcdrv->probe(pcdev, id);
415 if (ret == 0)
416 break;
417
Russell King92b97f02011-08-14 09:13:48 +0100418 pm_runtime_disable(dev);
419 pm_runtime_set_suspended(dev);
420 pm_runtime_put_noidle(dev);
421
Russell King7cfe2492010-07-15 10:47:14 +0100422 amba_put_disable_pclk(pcdev);
Linus Walleij65500fa2010-11-04 13:06:59 +0100423 amba_put_disable_vcore(pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100424 } while (0);
425
426 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428
429static int amba_remove(struct device *dev)
430{
Russell King7cfe2492010-07-15 10:47:14 +0100431 struct amba_device *pcdev = to_amba_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 struct amba_driver *drv = to_amba_driver(dev->driver);
Russell King92b97f02011-08-14 09:13:48 +0100433 int ret;
434
435 pm_runtime_get_sync(dev);
436 ret = drv->remove(pcdev);
437 pm_runtime_put_noidle(dev);
438
439 /* Undo the runtime PM settings in amba_probe() */
440 pm_runtime_disable(dev);
441 pm_runtime_set_suspended(dev);
442 pm_runtime_put_noidle(dev);
Russell King7cfe2492010-07-15 10:47:14 +0100443
444 amba_put_disable_pclk(pcdev);
Linus Walleij65500fa2010-11-04 13:06:59 +0100445 amba_put_disable_vcore(pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100446
447 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
450static void amba_shutdown(struct device *dev)
451{
452 struct amba_driver *drv = to_amba_driver(dev->driver);
453 drv->shutdown(to_amba_device(dev));
454}
455
456/**
457 * amba_driver_register - register an AMBA device driver
458 * @drv: amba device driver structure
459 *
460 * Register an AMBA device driver with the Linux device model
461 * core. If devices pre-exist, the drivers probe function will
462 * be called.
463 */
464int amba_driver_register(struct amba_driver *drv)
465{
466 drv->drv.bus = &amba_bustype;
467
468#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
469 SETFN(probe);
470 SETFN(remove);
471 SETFN(shutdown);
472
473 return driver_register(&drv->drv);
474}
475
476/**
477 * amba_driver_unregister - remove an AMBA device driver
478 * @drv: AMBA device driver structure to remove
479 *
480 * Unregister an AMBA device driver from the Linux device
481 * model. The device model will call the drivers remove function
482 * for each device the device driver is currently handling.
483 */
484void amba_driver_unregister(struct amba_driver *drv)
485{
486 driver_unregister(&drv->drv);
487}
488
489
490static void amba_device_release(struct device *dev)
491{
492 struct amba_device *d = to_amba_device(dev);
493
494 if (d->res.parent)
495 release_resource(&d->res);
496 kfree(d);
497}
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499/**
500 * amba_device_register - register an AMBA device
501 * @dev: AMBA device to register
502 * @parent: parent memory resource
503 *
504 * Setup the AMBA device, reading the cell ID if present.
505 * Claim the resource, and register the AMBA device with
506 * the Linux device manager.
507 */
508int amba_device_register(struct amba_device *dev, struct resource *parent)
509{
Leo Chen8afe0b92009-07-28 23:34:59 +0100510 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 void __iomem *tmp;
512 int i, ret;
513
Russell King557dca52009-07-05 22:39:08 +0100514 device_initialize(&dev->dev);
515
516 /*
517 * Copy from device_add
518 */
519 if (dev->dev.init_name) {
520 dev_set_name(&dev->dev, "%s", dev->dev.init_name);
521 dev->dev.init_name = NULL;
522 }
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 dev->dev.release = amba_device_release;
525 dev->dev.bus = &amba_bustype;
526 dev->dev.dma_mask = &dev->dma_mask;
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700527 dev->res.name = dev_name(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 if (!dev->dev.coherent_dma_mask && dev->dma_mask)
530 dev_warn(&dev->dev, "coherent dma mask is unset\n");
531
532 ret = request_resource(parent, &dev->res);
Russell King96b13f52006-11-30 14:04:49 +0000533 if (ret)
534 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Linus Walleij97ceed12011-03-24 16:12:40 +0100536 /* Hard-coded primecell ID instead of plug-n-play */
537 if (dev->periphid != 0)
538 goto skip_probe;
539
Leo Chen8afe0b92009-07-28 23:34:59 +0100540 /*
541 * Dynamically calculate the size of the resource
542 * and use this for iomap
543 */
544 size = resource_size(&dev->res);
545 tmp = ioremap(dev->res.start, size);
Russell King96b13f52006-11-30 14:04:49 +0000546 if (!tmp) {
547 ret = -ENOMEM;
548 goto err_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 }
Russell King96b13f52006-11-30 14:04:49 +0000550
Russell King7cfe2492010-07-15 10:47:14 +0100551 ret = amba_get_enable_pclk(dev);
552 if (ret == 0) {
553 u32 pid, cid;
554
555 /*
556 * Read pid and cid based on size of resource
557 * they are located at end of region
558 */
559 for (pid = 0, i = 0; i < 4; i++)
560 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
561 (i * 8);
562 for (cid = 0, i = 0; i < 4; i++)
563 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
564 (i * 8);
565
566 amba_put_disable_pclk(dev);
567
Linus Walleij01723a92010-09-07 22:43:19 +0100568 if (cid == AMBA_CID)
Russell King7cfe2492010-07-15 10:47:14 +0100569 dev->periphid = pid;
570
571 if (!dev->periphid)
572 ret = -ENODEV;
573 }
Russell King96b13f52006-11-30 14:04:49 +0000574
575 iounmap(tmp);
576
Russell King7cfe2492010-07-15 10:47:14 +0100577 if (ret)
Russell King96b13f52006-11-30 14:04:49 +0000578 goto err_release;
Russell King96b13f52006-11-30 14:04:49 +0000579
Linus Walleij97ceed12011-03-24 16:12:40 +0100580 skip_probe:
Russell King557dca52009-07-05 22:39:08 +0100581 ret = device_add(&dev->dev);
Russell King96b13f52006-11-30 14:04:49 +0000582 if (ret)
583 goto err_release;
584
585 if (dev->irq[0] != NO_IRQ)
586 ret = device_create_file(&dev->dev, &dev_attr_irq0);
587 if (ret == 0 && dev->irq[1] != NO_IRQ)
588 ret = device_create_file(&dev->dev, &dev_attr_irq1);
589 if (ret == 0)
590 return ret;
591
592 device_unregister(&dev->dev);
593
594 err_release:
595 release_resource(&dev->res);
596 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 return ret;
598}
599
600/**
601 * amba_device_unregister - unregister an AMBA device
602 * @dev: AMBA device to remove
603 *
604 * Remove the specified AMBA device from the Linux device
605 * manager. All files associated with this object will be
606 * destroyed, and device drivers notified that the device has
607 * been removed. The AMBA device's resources including
608 * the amba_device structure will be freed once all
609 * references to it have been dropped.
610 */
611void amba_device_unregister(struct amba_device *dev)
612{
613 device_unregister(&dev->dev);
614}
615
616
617struct find_data {
618 struct amba_device *dev;
619 struct device *parent;
620 const char *busid;
621 unsigned int id;
622 unsigned int mask;
623};
624
625static int amba_find_match(struct device *dev, void *data)
626{
627 struct find_data *d = data;
628 struct amba_device *pcdev = to_amba_device(dev);
629 int r;
630
631 r = (pcdev->periphid & d->mask) == d->id;
632 if (d->parent)
633 r &= d->parent == dev->parent;
634 if (d->busid)
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700635 r &= strcmp(dev_name(dev), d->busid) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
637 if (r) {
638 get_device(dev);
639 d->dev = pcdev;
640 }
641
642 return r;
643}
644
645/**
646 * amba_find_device - locate an AMBA device given a bus id
647 * @busid: bus id for device (or NULL)
648 * @parent: parent device (or NULL)
649 * @id: peripheral ID (or 0)
650 * @mask: peripheral ID mask (or 0)
651 *
652 * Return the AMBA device corresponding to the supplied parameters.
653 * If no device matches, returns NULL.
654 *
655 * NOTE: When a valid device is found, its refcount is
656 * incremented, and must be decremented before the returned
657 * reference.
658 */
659struct amba_device *
660amba_find_device(const char *busid, struct device *parent, unsigned int id,
661 unsigned int mask)
662{
663 struct find_data data;
664
665 data.dev = NULL;
666 data.parent = parent;
667 data.busid = busid;
668 data.id = id;
669 data.mask = mask;
670
671 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
672
673 return data.dev;
674}
675
676/**
677 * amba_request_regions - request all mem regions associated with device
678 * @dev: amba_device structure for device
679 * @name: name, or NULL to use driver name
680 */
681int amba_request_regions(struct amba_device *dev, const char *name)
682{
683 int ret = 0;
Leo Chen8afe0b92009-07-28 23:34:59 +0100684 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 if (!name)
687 name = dev->dev.driver->name;
688
Leo Chen8afe0b92009-07-28 23:34:59 +0100689 size = resource_size(&dev->res);
690
691 if (!request_mem_region(dev->res.start, size, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 ret = -EBUSY;
693
694 return ret;
695}
696
697/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300698 * amba_release_regions - release mem regions associated with device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 * @dev: amba_device structure for device
700 *
701 * Release regions claimed by a successful call to amba_request_regions.
702 */
703void amba_release_regions(struct amba_device *dev)
704{
Leo Chen8afe0b92009-07-28 23:34:59 +0100705 u32 size;
706
707 size = resource_size(&dev->res);
708 release_mem_region(dev->res.start, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709}
710
711EXPORT_SYMBOL(amba_driver_register);
712EXPORT_SYMBOL(amba_driver_unregister);
713EXPORT_SYMBOL(amba_device_register);
714EXPORT_SYMBOL(amba_device_unregister);
715EXPORT_SYMBOL(amba_find_device);
716EXPORT_SYMBOL(amba_request_regions);
717EXPORT_SYMBOL(amba_release_regions);