blob: 7025593a58c89d39cb3ff260801b242730d8fdf2 [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);
Eric Rannaudbf624562007-03-30 22:23:12 -070055 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056}
57#else
Paul Jackson6d20b032005-11-25 20:04:26 -080058#define amba_uevent NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#endif
60
Russell King96b13f52006-11-30 14:04:49 +000061#define amba_attr_func(name,fmt,arg...) \
62static ssize_t name##_show(struct device *_dev, \
63 struct device_attribute *attr, char *buf) \
64{ \
65 struct amba_device *dev = to_amba_device(_dev); \
66 return sprintf(buf, fmt, arg); \
67}
68
69#define amba_attr(name,fmt,arg...) \
70amba_attr_func(name,fmt,arg) \
71static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
72
73amba_attr_func(id, "%08x\n", dev->periphid);
74amba_attr(irq0, "%u\n", dev->irq[0]);
75amba_attr(irq1, "%u\n", dev->irq[1]);
76amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
77 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
78 dev->res.flags);
79
80static struct device_attribute amba_dev_attrs[] = {
81 __ATTR_RO(id),
82 __ATTR_RO(resource),
83 __ATTR_NULL,
84};
85
Rabin Vincentba74ec72011-02-23 04:33:17 +010086#ifdef CONFIG_PM_SLEEP
87
88static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
89{
90 struct amba_driver *adrv = to_amba_driver(dev->driver);
91 struct amba_device *adev = to_amba_device(dev);
92 int ret = 0;
93
94 if (dev->driver && adrv->suspend)
95 ret = adrv->suspend(adev, mesg);
96
97 return ret;
98}
99
100static int amba_legacy_resume(struct device *dev)
101{
102 struct amba_driver *adrv = to_amba_driver(dev->driver);
103 struct amba_device *adev = to_amba_device(dev);
104 int ret = 0;
105
106 if (dev->driver && adrv->resume)
107 ret = adrv->resume(adev);
108
109 return ret;
110}
111
112static int amba_pm_prepare(struct device *dev)
113{
114 struct device_driver *drv = dev->driver;
115 int ret = 0;
116
117 if (drv && drv->pm && drv->pm->prepare)
118 ret = drv->pm->prepare(dev);
119
120 return ret;
121}
122
123static void amba_pm_complete(struct device *dev)
124{
125 struct device_driver *drv = dev->driver;
126
127 if (drv && drv->pm && drv->pm->complete)
128 drv->pm->complete(dev);
129}
130
131#else /* !CONFIG_PM_SLEEP */
132
133#define amba_pm_prepare NULL
134#define amba_pm_complete NULL
135
136#endif /* !CONFIG_PM_SLEEP */
137
138#ifdef CONFIG_SUSPEND
139
140static int amba_pm_suspend(struct device *dev)
141{
142 struct device_driver *drv = dev->driver;
143 int ret = 0;
144
145 if (!drv)
146 return 0;
147
148 if (drv->pm) {
149 if (drv->pm->suspend)
150 ret = drv->pm->suspend(dev);
151 } else {
152 ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
153 }
154
155 return ret;
156}
157
158static int amba_pm_suspend_noirq(struct device *dev)
159{
160 struct device_driver *drv = dev->driver;
161 int ret = 0;
162
163 if (!drv)
164 return 0;
165
166 if (drv->pm) {
167 if (drv->pm->suspend_noirq)
168 ret = drv->pm->suspend_noirq(dev);
169 }
170
171 return ret;
172}
173
174static int amba_pm_resume(struct device *dev)
175{
176 struct device_driver *drv = dev->driver;
177 int ret = 0;
178
179 if (!drv)
180 return 0;
181
182 if (drv->pm) {
183 if (drv->pm->resume)
184 ret = drv->pm->resume(dev);
185 } else {
186 ret = amba_legacy_resume(dev);
187 }
188
189 return ret;
190}
191
192static int amba_pm_resume_noirq(struct device *dev)
193{
194 struct device_driver *drv = dev->driver;
195 int ret = 0;
196
197 if (!drv)
198 return 0;
199
200 if (drv->pm) {
201 if (drv->pm->resume_noirq)
202 ret = drv->pm->resume_noirq(dev);
203 }
204
205 return ret;
206}
207
208#else /* !CONFIG_SUSPEND */
209
210#define amba_pm_suspend NULL
211#define amba_pm_resume NULL
212#define amba_pm_suspend_noirq NULL
213#define amba_pm_resume_noirq NULL
214
215#endif /* !CONFIG_SUSPEND */
216
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200217#ifdef CONFIG_HIBERNATE_CALLBACKS
Rabin Vincentba74ec72011-02-23 04:33:17 +0100218
219static int amba_pm_freeze(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->freeze)
229 ret = drv->pm->freeze(dev);
230 } else {
231 ret = amba_legacy_suspend(dev, PMSG_FREEZE);
232 }
233
234 return ret;
235}
236
237static int amba_pm_freeze_noirq(struct device *dev)
238{
239 struct device_driver *drv = dev->driver;
240 int ret = 0;
241
242 if (!drv)
243 return 0;
244
245 if (drv->pm) {
246 if (drv->pm->freeze_noirq)
247 ret = drv->pm->freeze_noirq(dev);
248 }
249
250 return ret;
251}
252
253static int amba_pm_thaw(struct device *dev)
254{
255 struct device_driver *drv = dev->driver;
256 int ret = 0;
257
258 if (!drv)
259 return 0;
260
261 if (drv->pm) {
262 if (drv->pm->thaw)
263 ret = drv->pm->thaw(dev);
264 } else {
265 ret = amba_legacy_resume(dev);
266 }
267
268 return ret;
269}
270
271static int amba_pm_thaw_noirq(struct device *dev)
272{
273 struct device_driver *drv = dev->driver;
274 int ret = 0;
275
276 if (!drv)
277 return 0;
278
279 if (drv->pm) {
280 if (drv->pm->thaw_noirq)
281 ret = drv->pm->thaw_noirq(dev);
282 }
283
284 return ret;
285}
286
287static int amba_pm_poweroff(struct device *dev)
288{
289 struct device_driver *drv = dev->driver;
290 int ret = 0;
291
292 if (!drv)
293 return 0;
294
295 if (drv->pm) {
296 if (drv->pm->poweroff)
297 ret = drv->pm->poweroff(dev);
298 } else {
299 ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
300 }
301
302 return ret;
303}
304
305static int amba_pm_poweroff_noirq(struct device *dev)
306{
307 struct device_driver *drv = dev->driver;
308 int ret = 0;
309
310 if (!drv)
311 return 0;
312
313 if (drv->pm) {
314 if (drv->pm->poweroff_noirq)
315 ret = drv->pm->poweroff_noirq(dev);
316 }
317
318 return ret;
319}
320
321static int amba_pm_restore(struct device *dev)
322{
323 struct device_driver *drv = dev->driver;
324 int ret = 0;
325
326 if (!drv)
327 return 0;
328
329 if (drv->pm) {
330 if (drv->pm->restore)
331 ret = drv->pm->restore(dev);
332 } else {
333 ret = amba_legacy_resume(dev);
334 }
335
336 return ret;
337}
338
339static int amba_pm_restore_noirq(struct device *dev)
340{
341 struct device_driver *drv = dev->driver;
342 int ret = 0;
343
344 if (!drv)
345 return 0;
346
347 if (drv->pm) {
348 if (drv->pm->restore_noirq)
349 ret = drv->pm->restore_noirq(dev);
350 }
351
352 return ret;
353}
354
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200355#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rabin Vincentba74ec72011-02-23 04:33:17 +0100356
357#define amba_pm_freeze NULL
358#define amba_pm_thaw NULL
359#define amba_pm_poweroff NULL
360#define amba_pm_restore NULL
361#define amba_pm_freeze_noirq NULL
362#define amba_pm_thaw_noirq NULL
363#define amba_pm_poweroff_noirq NULL
364#define amba_pm_restore_noirq NULL
365
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200366#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rabin Vincentba74ec72011-02-23 04:33:17 +0100367
368#ifdef CONFIG_PM
369
370static const struct dev_pm_ops amba_pm = {
371 .prepare = amba_pm_prepare,
372 .complete = amba_pm_complete,
373 .suspend = amba_pm_suspend,
374 .resume = amba_pm_resume,
375 .freeze = amba_pm_freeze,
376 .thaw = amba_pm_thaw,
377 .poweroff = amba_pm_poweroff,
378 .restore = amba_pm_restore,
379 .suspend_noirq = amba_pm_suspend_noirq,
380 .resume_noirq = amba_pm_resume_noirq,
381 .freeze_noirq = amba_pm_freeze_noirq,
382 .thaw_noirq = amba_pm_thaw_noirq,
383 .poweroff_noirq = amba_pm_poweroff_noirq,
384 .restore_noirq = amba_pm_restore_noirq,
385 SET_RUNTIME_PM_OPS(
386 pm_generic_runtime_suspend,
387 pm_generic_runtime_resume,
388 pm_generic_runtime_idle
389 )
390};
391
392#define AMBA_PM (&amba_pm)
393
394#else /* !CONFIG_PM */
395
396#define AMBA_PM NULL
397
398#endif /* !CONFIG_PM */
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400/*
401 * Primecells are part of the Advanced Microcontroller Bus Architecture,
402 * so we call the bus "amba".
403 */
Rob Herring394d5ae2011-02-12 15:58:25 +0100404struct bus_type amba_bustype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 .name = "amba",
Russell King96b13f52006-11-30 14:04:49 +0000406 .dev_attrs = amba_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 .match = amba_match,
Paul Jackson6d20b032005-11-25 20:04:26 -0800408 .uevent = amba_uevent,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100409 .pm = AMBA_PM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410};
411
412static int __init amba_init(void)
413{
414 return bus_register(&amba_bustype);
415}
416
417postcore_initcall(amba_init);
418
Russell King7cfe2492010-07-15 10:47:14 +0100419static int amba_get_enable_pclk(struct amba_device *pcdev)
420{
421 struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
422 int ret;
423
424 pcdev->pclk = pclk;
425
426 if (IS_ERR(pclk))
427 return PTR_ERR(pclk);
428
429 ret = clk_enable(pclk);
430 if (ret)
431 clk_put(pclk);
432
433 return ret;
434}
435
436static void amba_put_disable_pclk(struct amba_device *pcdev)
437{
438 struct clk *pclk = pcdev->pclk;
439
440 clk_disable(pclk);
441 clk_put(pclk);
442}
443
Linus Walleij65500fa2010-11-04 13:06:59 +0100444static int amba_get_enable_vcore(struct amba_device *pcdev)
445{
446 struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
447 int ret;
448
449 pcdev->vcore = vcore;
450
451 if (IS_ERR(vcore)) {
452 /* It is OK not to supply a vcore regulator */
453 if (PTR_ERR(vcore) == -ENODEV)
454 return 0;
455 return PTR_ERR(vcore);
456 }
457
458 ret = regulator_enable(vcore);
459 if (ret) {
460 regulator_put(vcore);
461 pcdev->vcore = ERR_PTR(-ENODEV);
462 }
463
464 return ret;
465}
466
467static void amba_put_disable_vcore(struct amba_device *pcdev)
468{
469 struct regulator *vcore = pcdev->vcore;
470
471 if (!IS_ERR(vcore)) {
472 regulator_disable(vcore);
473 regulator_put(vcore);
474 }
475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477/*
478 * These are the device model conversion veneers; they convert the
479 * device model structures to our more specific structures.
480 */
481static int amba_probe(struct device *dev)
482{
483 struct amba_device *pcdev = to_amba_device(dev);
484 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
Russell Kingc862aab2011-02-19 15:55:26 +0000485 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100486 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Russell King7cfe2492010-07-15 10:47:14 +0100488 do {
Linus Walleij65500fa2010-11-04 13:06:59 +0100489 ret = amba_get_enable_vcore(pcdev);
490 if (ret)
491 break;
492
Russell King7cfe2492010-07-15 10:47:14 +0100493 ret = amba_get_enable_pclk(pcdev);
494 if (ret)
495 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Russell King7cfe2492010-07-15 10:47:14 +0100497 ret = pcdrv->probe(pcdev, id);
498 if (ret == 0)
499 break;
500
501 amba_put_disable_pclk(pcdev);
Linus Walleij65500fa2010-11-04 13:06:59 +0100502 amba_put_disable_vcore(pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100503 } while (0);
504
505 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506}
507
508static int amba_remove(struct device *dev)
509{
Russell King7cfe2492010-07-15 10:47:14 +0100510 struct amba_device *pcdev = to_amba_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 struct amba_driver *drv = to_amba_driver(dev->driver);
Russell King7cfe2492010-07-15 10:47:14 +0100512 int ret = drv->remove(pcdev);
513
514 amba_put_disable_pclk(pcdev);
Linus Walleij65500fa2010-11-04 13:06:59 +0100515 amba_put_disable_vcore(pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100516
517 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520static void amba_shutdown(struct device *dev)
521{
522 struct amba_driver *drv = to_amba_driver(dev->driver);
523 drv->shutdown(to_amba_device(dev));
524}
525
526/**
527 * amba_driver_register - register an AMBA device driver
528 * @drv: amba device driver structure
529 *
530 * Register an AMBA device driver with the Linux device model
531 * core. If devices pre-exist, the drivers probe function will
532 * be called.
533 */
534int amba_driver_register(struct amba_driver *drv)
535{
536 drv->drv.bus = &amba_bustype;
537
538#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
539 SETFN(probe);
540 SETFN(remove);
541 SETFN(shutdown);
542
543 return driver_register(&drv->drv);
544}
545
546/**
547 * amba_driver_unregister - remove an AMBA device driver
548 * @drv: AMBA device driver structure to remove
549 *
550 * Unregister an AMBA device driver from the Linux device
551 * model. The device model will call the drivers remove function
552 * for each device the device driver is currently handling.
553 */
554void amba_driver_unregister(struct amba_driver *drv)
555{
556 driver_unregister(&drv->drv);
557}
558
559
560static void amba_device_release(struct device *dev)
561{
562 struct amba_device *d = to_amba_device(dev);
563
564 if (d->res.parent)
565 release_resource(&d->res);
566 kfree(d);
567}
568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569/**
570 * amba_device_register - register an AMBA device
571 * @dev: AMBA device to register
572 * @parent: parent memory resource
573 *
574 * Setup the AMBA device, reading the cell ID if present.
575 * Claim the resource, and register the AMBA device with
576 * the Linux device manager.
577 */
578int amba_device_register(struct amba_device *dev, struct resource *parent)
579{
Leo Chen8afe0b92009-07-28 23:34:59 +0100580 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 void __iomem *tmp;
582 int i, ret;
583
Russell King557dca52009-07-05 22:39:08 +0100584 device_initialize(&dev->dev);
585
586 /*
587 * Copy from device_add
588 */
589 if (dev->dev.init_name) {
590 dev_set_name(&dev->dev, "%s", dev->dev.init_name);
591 dev->dev.init_name = NULL;
592 }
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 dev->dev.release = amba_device_release;
595 dev->dev.bus = &amba_bustype;
596 dev->dev.dma_mask = &dev->dma_mask;
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700597 dev->res.name = dev_name(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599 if (!dev->dev.coherent_dma_mask && dev->dma_mask)
600 dev_warn(&dev->dev, "coherent dma mask is unset\n");
601
602 ret = request_resource(parent, &dev->res);
Russell King96b13f52006-11-30 14:04:49 +0000603 if (ret)
604 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Leo Chen8afe0b92009-07-28 23:34:59 +0100606 /*
607 * Dynamically calculate the size of the resource
608 * and use this for iomap
609 */
610 size = resource_size(&dev->res);
611 tmp = ioremap(dev->res.start, size);
Russell King96b13f52006-11-30 14:04:49 +0000612 if (!tmp) {
613 ret = -ENOMEM;
614 goto err_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Russell King96b13f52006-11-30 14:04:49 +0000616
Russell King7cfe2492010-07-15 10:47:14 +0100617 ret = amba_get_enable_pclk(dev);
618 if (ret == 0) {
619 u32 pid, cid;
620
621 /*
622 * Read pid and cid based on size of resource
623 * they are located at end of region
624 */
625 for (pid = 0, i = 0; i < 4; i++)
626 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
627 (i * 8);
628 for (cid = 0, i = 0; i < 4; i++)
629 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
630 (i * 8);
631
632 amba_put_disable_pclk(dev);
633
Linus Walleij01723a92010-09-07 22:43:19 +0100634 if (cid == AMBA_CID)
Russell King7cfe2492010-07-15 10:47:14 +0100635 dev->periphid = pid;
636
637 if (!dev->periphid)
638 ret = -ENODEV;
639 }
Russell King96b13f52006-11-30 14:04:49 +0000640
641 iounmap(tmp);
642
Russell King7cfe2492010-07-15 10:47:14 +0100643 if (ret)
Russell King96b13f52006-11-30 14:04:49 +0000644 goto err_release;
Russell King96b13f52006-11-30 14:04:49 +0000645
Russell King557dca52009-07-05 22:39:08 +0100646 ret = device_add(&dev->dev);
Russell King96b13f52006-11-30 14:04:49 +0000647 if (ret)
648 goto err_release;
649
650 if (dev->irq[0] != NO_IRQ)
651 ret = device_create_file(&dev->dev, &dev_attr_irq0);
652 if (ret == 0 && dev->irq[1] != NO_IRQ)
653 ret = device_create_file(&dev->dev, &dev_attr_irq1);
654 if (ret == 0)
655 return ret;
656
657 device_unregister(&dev->dev);
658
659 err_release:
660 release_resource(&dev->res);
661 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return ret;
663}
664
665/**
666 * amba_device_unregister - unregister an AMBA device
667 * @dev: AMBA device to remove
668 *
669 * Remove the specified AMBA device from the Linux device
670 * manager. All files associated with this object will be
671 * destroyed, and device drivers notified that the device has
672 * been removed. The AMBA device's resources including
673 * the amba_device structure will be freed once all
674 * references to it have been dropped.
675 */
676void amba_device_unregister(struct amba_device *dev)
677{
678 device_unregister(&dev->dev);
679}
680
681
682struct find_data {
683 struct amba_device *dev;
684 struct device *parent;
685 const char *busid;
686 unsigned int id;
687 unsigned int mask;
688};
689
690static int amba_find_match(struct device *dev, void *data)
691{
692 struct find_data *d = data;
693 struct amba_device *pcdev = to_amba_device(dev);
694 int r;
695
696 r = (pcdev->periphid & d->mask) == d->id;
697 if (d->parent)
698 r &= d->parent == dev->parent;
699 if (d->busid)
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700700 r &= strcmp(dev_name(dev), d->busid) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 if (r) {
703 get_device(dev);
704 d->dev = pcdev;
705 }
706
707 return r;
708}
709
710/**
711 * amba_find_device - locate an AMBA device given a bus id
712 * @busid: bus id for device (or NULL)
713 * @parent: parent device (or NULL)
714 * @id: peripheral ID (or 0)
715 * @mask: peripheral ID mask (or 0)
716 *
717 * Return the AMBA device corresponding to the supplied parameters.
718 * If no device matches, returns NULL.
719 *
720 * NOTE: When a valid device is found, its refcount is
721 * incremented, and must be decremented before the returned
722 * reference.
723 */
724struct amba_device *
725amba_find_device(const char *busid, struct device *parent, unsigned int id,
726 unsigned int mask)
727{
728 struct find_data data;
729
730 data.dev = NULL;
731 data.parent = parent;
732 data.busid = busid;
733 data.id = id;
734 data.mask = mask;
735
736 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
737
738 return data.dev;
739}
740
741/**
742 * amba_request_regions - request all mem regions associated with device
743 * @dev: amba_device structure for device
744 * @name: name, or NULL to use driver name
745 */
746int amba_request_regions(struct amba_device *dev, const char *name)
747{
748 int ret = 0;
Leo Chen8afe0b92009-07-28 23:34:59 +0100749 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 if (!name)
752 name = dev->dev.driver->name;
753
Leo Chen8afe0b92009-07-28 23:34:59 +0100754 size = resource_size(&dev->res);
755
756 if (!request_mem_region(dev->res.start, size, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 ret = -EBUSY;
758
759 return ret;
760}
761
762/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300763 * amba_release_regions - release mem regions associated with device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 * @dev: amba_device structure for device
765 *
766 * Release regions claimed by a successful call to amba_request_regions.
767 */
768void amba_release_regions(struct amba_device *dev)
769{
Leo Chen8afe0b92009-07-28 23:34:59 +0100770 u32 size;
771
772 size = resource_size(&dev->res);
773 release_mem_region(dev->res.start, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
776EXPORT_SYMBOL(amba_driver_register);
777EXPORT_SYMBOL(amba_driver_unregister);
778EXPORT_SYMBOL(amba_device_register);
779EXPORT_SYMBOL(amba_device_unregister);
780EXPORT_SYMBOL(amba_find_device);
781EXPORT_SYMBOL(amba_request_regions);
782EXPORT_SYMBOL(amba_release_regions);