blob: cc273226dbd014868ac68342d07225e0b095d6e1 [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
Mark Brown1e458602012-04-13 13:11:50 +0100250 * does not result in loss of context.
Russell King92b97f02011-08-14 09:13:48 +0100251 */
252static int amba_pm_runtime_suspend(struct device *dev)
253{
254 struct amba_device *pcdev = to_amba_device(dev);
255 int ret = pm_generic_runtime_suspend(dev);
256
257 if (ret == 0 && dev->driver)
258 clk_disable(pcdev->pclk);
259
260 return ret;
261}
262
263static int amba_pm_runtime_resume(struct device *dev)
264{
265 struct amba_device *pcdev = to_amba_device(dev);
266 int ret;
267
268 if (dev->driver) {
269 ret = clk_enable(pcdev->pclk);
270 /* Failure is probably fatal to the system, but... */
271 if (ret)
272 return ret;
273 }
274
275 return pm_generic_runtime_resume(dev);
276}
277#endif
278
Rabin Vincentba74ec72011-02-23 04:33:17 +0100279#ifdef CONFIG_PM
280
281static const struct dev_pm_ops amba_pm = {
Rabin Vincentba74ec72011-02-23 04:33:17 +0100282 .suspend = amba_pm_suspend,
283 .resume = amba_pm_resume,
284 .freeze = amba_pm_freeze,
285 .thaw = amba_pm_thaw,
286 .poweroff = amba_pm_poweroff,
287 .restore = amba_pm_restore,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100288 SET_RUNTIME_PM_OPS(
Russell King92b97f02011-08-14 09:13:48 +0100289 amba_pm_runtime_suspend,
290 amba_pm_runtime_resume,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100291 pm_generic_runtime_idle
292 )
293};
294
295#define AMBA_PM (&amba_pm)
296
297#else /* !CONFIG_PM */
298
299#define AMBA_PM NULL
300
301#endif /* !CONFIG_PM */
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303/*
304 * Primecells are part of the Advanced Microcontroller Bus Architecture,
305 * so we call the bus "amba".
306 */
Rob Herring394d5ae2011-02-12 15:58:25 +0100307struct bus_type amba_bustype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 .name = "amba",
Russell King96b13f52006-11-30 14:04:49 +0000309 .dev_attrs = amba_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 .match = amba_match,
Paul Jackson6d20b032005-11-25 20:04:26 -0800311 .uevent = amba_uevent,
Rabin Vincentba74ec72011-02-23 04:33:17 +0100312 .pm = AMBA_PM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313};
314
315static int __init amba_init(void)
316{
317 return bus_register(&amba_bustype);
318}
319
320postcore_initcall(amba_init);
321
Russell King7cfe2492010-07-15 10:47:14 +0100322static int amba_get_enable_pclk(struct amba_device *pcdev)
323{
324 struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
325 int ret;
326
327 pcdev->pclk = pclk;
328
329 if (IS_ERR(pclk))
330 return PTR_ERR(pclk);
331
Russell Kingac3e2fa2011-09-22 12:20:55 +0100332 ret = clk_prepare(pclk);
333 if (ret) {
Russell King7cfe2492010-07-15 10:47:14 +0100334 clk_put(pclk);
Russell Kingac3e2fa2011-09-22 12:20:55 +0100335 return ret;
336 }
337
338 ret = clk_enable(pclk);
339 if (ret) {
340 clk_unprepare(pclk);
341 clk_put(pclk);
342 }
Russell King7cfe2492010-07-15 10:47:14 +0100343
344 return ret;
345}
346
347static void amba_put_disable_pclk(struct amba_device *pcdev)
348{
349 struct clk *pclk = pcdev->pclk;
350
351 clk_disable(pclk);
Russell Kingac3e2fa2011-09-22 12:20:55 +0100352 clk_unprepare(pclk);
Russell King7cfe2492010-07-15 10:47:14 +0100353 clk_put(pclk);
354}
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356/*
357 * These are the device model conversion veneers; they convert the
358 * device model structures to our more specific structures.
359 */
360static int amba_probe(struct device *dev)
361{
362 struct amba_device *pcdev = to_amba_device(dev);
363 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
Russell Kingc862aab2011-02-19 15:55:26 +0000364 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100365 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Russell King7cfe2492010-07-15 10:47:14 +0100367 do {
368 ret = amba_get_enable_pclk(pcdev);
369 if (ret)
370 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Russell King92b97f02011-08-14 09:13:48 +0100372 pm_runtime_get_noresume(dev);
373 pm_runtime_set_active(dev);
374 pm_runtime_enable(dev);
375
Russell King7cfe2492010-07-15 10:47:14 +0100376 ret = pcdrv->probe(pcdev, id);
377 if (ret == 0)
378 break;
379
Russell King92b97f02011-08-14 09:13:48 +0100380 pm_runtime_disable(dev);
381 pm_runtime_set_suspended(dev);
382 pm_runtime_put_noidle(dev);
383
Russell King7cfe2492010-07-15 10:47:14 +0100384 amba_put_disable_pclk(pcdev);
385 } while (0);
386
387 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
390static int amba_remove(struct device *dev)
391{
Russell King7cfe2492010-07-15 10:47:14 +0100392 struct amba_device *pcdev = to_amba_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 struct amba_driver *drv = to_amba_driver(dev->driver);
Russell King92b97f02011-08-14 09:13:48 +0100394 int ret;
395
396 pm_runtime_get_sync(dev);
397 ret = drv->remove(pcdev);
398 pm_runtime_put_noidle(dev);
399
400 /* Undo the runtime PM settings in amba_probe() */
401 pm_runtime_disable(dev);
402 pm_runtime_set_suspended(dev);
403 pm_runtime_put_noidle(dev);
Russell King7cfe2492010-07-15 10:47:14 +0100404
405 amba_put_disable_pclk(pcdev);
406
407 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
410static void amba_shutdown(struct device *dev)
411{
412 struct amba_driver *drv = to_amba_driver(dev->driver);
413 drv->shutdown(to_amba_device(dev));
414}
415
416/**
417 * amba_driver_register - register an AMBA device driver
418 * @drv: amba device driver structure
419 *
420 * Register an AMBA device driver with the Linux device model
421 * core. If devices pre-exist, the drivers probe function will
422 * be called.
423 */
424int amba_driver_register(struct amba_driver *drv)
425{
426 drv->drv.bus = &amba_bustype;
427
428#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
429 SETFN(probe);
430 SETFN(remove);
431 SETFN(shutdown);
432
433 return driver_register(&drv->drv);
434}
435
436/**
437 * amba_driver_unregister - remove an AMBA device driver
438 * @drv: AMBA device driver structure to remove
439 *
440 * Unregister an AMBA device driver from the Linux device
441 * model. The device model will call the drivers remove function
442 * for each device the device driver is currently handling.
443 */
444void amba_driver_unregister(struct amba_driver *drv)
445{
446 driver_unregister(&drv->drv);
447}
448
449
450static void amba_device_release(struct device *dev)
451{
452 struct amba_device *d = to_amba_device(dev);
453
454 if (d->res.parent)
455 release_resource(&d->res);
456 kfree(d);
457}
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459/**
Russell Kingd5dc9272011-12-18 11:07:47 +0000460 * amba_device_add - add a previously allocated AMBA device structure
461 * @dev: AMBA device allocated by amba_device_alloc
462 * @parent: resource parent for this devices resources
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 *
Russell Kingd5dc9272011-12-18 11:07:47 +0000464 * Claim the resource, and read the device cell ID if not already
465 * initialized. Register the AMBA device with the Linux device
466 * manager.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 */
Russell Kingd5dc9272011-12-18 11:07:47 +0000468int amba_device_add(struct amba_device *dev, struct resource *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Leo Chen8afe0b92009-07-28 23:34:59 +0100470 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 void __iomem *tmp;
472 int i, ret;
473
Russell King2eac58d2011-12-18 11:43:56 +0000474 WARN_ON(dev->irq[0] == (unsigned int)-1);
475 WARN_ON(dev->irq[1] == (unsigned int)-1);
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 ret = request_resource(parent, &dev->res);
Russell King96b13f52006-11-30 14:04:49 +0000478 if (ret)
479 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Linus Walleij97ceed12011-03-24 16:12:40 +0100481 /* Hard-coded primecell ID instead of plug-n-play */
482 if (dev->periphid != 0)
483 goto skip_probe;
484
Leo Chen8afe0b92009-07-28 23:34:59 +0100485 /*
486 * Dynamically calculate the size of the resource
487 * and use this for iomap
488 */
489 size = resource_size(&dev->res);
490 tmp = ioremap(dev->res.start, size);
Russell King96b13f52006-11-30 14:04:49 +0000491 if (!tmp) {
492 ret = -ENOMEM;
493 goto err_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
Russell King96b13f52006-11-30 14:04:49 +0000495
Russell King7cfe2492010-07-15 10:47:14 +0100496 ret = amba_get_enable_pclk(dev);
497 if (ret == 0) {
498 u32 pid, cid;
499
500 /*
501 * Read pid and cid based on size of resource
502 * they are located at end of region
503 */
504 for (pid = 0, i = 0; i < 4; i++)
505 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
506 (i * 8);
507 for (cid = 0, i = 0; i < 4; i++)
508 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
509 (i * 8);
510
511 amba_put_disable_pclk(dev);
512
Linus Walleij01723a92010-09-07 22:43:19 +0100513 if (cid == AMBA_CID)
Russell King7cfe2492010-07-15 10:47:14 +0100514 dev->periphid = pid;
515
516 if (!dev->periphid)
517 ret = -ENODEV;
518 }
Russell King96b13f52006-11-30 14:04:49 +0000519
520 iounmap(tmp);
521
Russell King7cfe2492010-07-15 10:47:14 +0100522 if (ret)
Russell King96b13f52006-11-30 14:04:49 +0000523 goto err_release;
Russell King96b13f52006-11-30 14:04:49 +0000524
Linus Walleij97ceed12011-03-24 16:12:40 +0100525 skip_probe:
Russell King557dca52009-07-05 22:39:08 +0100526 ret = device_add(&dev->dev);
Russell King96b13f52006-11-30 14:04:49 +0000527 if (ret)
528 goto err_release;
529
Russell King023f1172011-12-18 11:31:51 +0000530 if (dev->irq[0] && dev->irq[0] != NO_IRQ)
Russell King96b13f52006-11-30 14:04:49 +0000531 ret = device_create_file(&dev->dev, &dev_attr_irq0);
Russell King023f1172011-12-18 11:31:51 +0000532 if (ret == 0 && dev->irq[1] && dev->irq[1] != NO_IRQ)
Russell King96b13f52006-11-30 14:04:49 +0000533 ret = device_create_file(&dev->dev, &dev_attr_irq1);
534 if (ret == 0)
535 return ret;
536
537 device_unregister(&dev->dev);
538
539 err_release:
540 release_resource(&dev->res);
541 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return ret;
543}
Russell Kingd5dc9272011-12-18 11:07:47 +0000544EXPORT_SYMBOL_GPL(amba_device_add);
545
546static void amba_device_initialize(struct amba_device *dev, const char *name)
547{
548 device_initialize(&dev->dev);
549 if (name)
550 dev_set_name(&dev->dev, "%s", name);
551 dev->dev.release = amba_device_release;
552 dev->dev.bus = &amba_bustype;
553 dev->dev.dma_mask = &dev->dma_mask;
554 dev->res.name = dev_name(&dev->dev);
555}
556
557/**
558 * amba_device_alloc - allocate an AMBA device
559 * @name: sysfs name of the AMBA device
560 * @base: base of AMBA device
561 * @size: size of AMBA device
562 *
563 * Allocate and initialize an AMBA device structure. Returns %NULL
564 * on failure.
565 */
566struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
567 size_t size)
568{
569 struct amba_device *dev;
570
571 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
572 if (dev) {
573 amba_device_initialize(dev, name);
574 dev->res.start = base;
575 dev->res.end = base + size - 1;
576 dev->res.flags = IORESOURCE_MEM;
577 }
578
579 return dev;
580}
581EXPORT_SYMBOL_GPL(amba_device_alloc);
582
583/**
584 * amba_device_register - register an AMBA device
585 * @dev: AMBA device to register
586 * @parent: parent memory resource
587 *
588 * Setup the AMBA device, reading the cell ID if present.
589 * Claim the resource, and register the AMBA device with
590 * the Linux device manager.
591 */
592int amba_device_register(struct amba_device *dev, struct resource *parent)
593{
594 amba_device_initialize(dev, dev->dev.init_name);
595 dev->dev.init_name = NULL;
596
597 if (!dev->dev.coherent_dma_mask && dev->dma_mask)
598 dev_warn(&dev->dev, "coherent dma mask is unset\n");
599
600 return amba_device_add(dev, parent);
601}
602
603/**
604 * amba_device_put - put an AMBA device
605 * @dev: AMBA device to put
606 */
607void amba_device_put(struct amba_device *dev)
608{
609 put_device(&dev->dev);
610}
611EXPORT_SYMBOL_GPL(amba_device_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613/**
614 * amba_device_unregister - unregister an AMBA device
615 * @dev: AMBA device to remove
616 *
617 * Remove the specified AMBA device from the Linux device
618 * manager. All files associated with this object will be
619 * destroyed, and device drivers notified that the device has
620 * been removed. The AMBA device's resources including
621 * the amba_device structure will be freed once all
622 * references to it have been dropped.
623 */
624void amba_device_unregister(struct amba_device *dev)
625{
626 device_unregister(&dev->dev);
627}
628
629
630struct find_data {
631 struct amba_device *dev;
632 struct device *parent;
633 const char *busid;
634 unsigned int id;
635 unsigned int mask;
636};
637
638static int amba_find_match(struct device *dev, void *data)
639{
640 struct find_data *d = data;
641 struct amba_device *pcdev = to_amba_device(dev);
642 int r;
643
644 r = (pcdev->periphid & d->mask) == d->id;
645 if (d->parent)
646 r &= d->parent == dev->parent;
647 if (d->busid)
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700648 r &= strcmp(dev_name(dev), d->busid) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 if (r) {
651 get_device(dev);
652 d->dev = pcdev;
653 }
654
655 return r;
656}
657
658/**
659 * amba_find_device - locate an AMBA device given a bus id
660 * @busid: bus id for device (or NULL)
661 * @parent: parent device (or NULL)
662 * @id: peripheral ID (or 0)
663 * @mask: peripheral ID mask (or 0)
664 *
665 * Return the AMBA device corresponding to the supplied parameters.
666 * If no device matches, returns NULL.
667 *
668 * NOTE: When a valid device is found, its refcount is
669 * incremented, and must be decremented before the returned
670 * reference.
671 */
672struct amba_device *
673amba_find_device(const char *busid, struct device *parent, unsigned int id,
674 unsigned int mask)
675{
676 struct find_data data;
677
678 data.dev = NULL;
679 data.parent = parent;
680 data.busid = busid;
681 data.id = id;
682 data.mask = mask;
683
684 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
685
686 return data.dev;
687}
688
689/**
690 * amba_request_regions - request all mem regions associated with device
691 * @dev: amba_device structure for device
692 * @name: name, or NULL to use driver name
693 */
694int amba_request_regions(struct amba_device *dev, const char *name)
695{
696 int ret = 0;
Leo Chen8afe0b92009-07-28 23:34:59 +0100697 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 if (!name)
700 name = dev->dev.driver->name;
701
Leo Chen8afe0b92009-07-28 23:34:59 +0100702 size = resource_size(&dev->res);
703
704 if (!request_mem_region(dev->res.start, size, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 ret = -EBUSY;
706
707 return ret;
708}
709
710/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300711 * amba_release_regions - release mem regions associated with device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 * @dev: amba_device structure for device
713 *
714 * Release regions claimed by a successful call to amba_request_regions.
715 */
716void amba_release_regions(struct amba_device *dev)
717{
Leo Chen8afe0b92009-07-28 23:34:59 +0100718 u32 size;
719
720 size = resource_size(&dev->res);
721 release_mem_region(dev->res.start, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722}
723
724EXPORT_SYMBOL(amba_driver_register);
725EXPORT_SYMBOL(amba_driver_unregister);
726EXPORT_SYMBOL(amba_device_register);
727EXPORT_SYMBOL(amba_device_unregister);
728EXPORT_SYMBOL(amba_find_device);
729EXPORT_SYMBOL(amba_request_regions);
730EXPORT_SYMBOL(amba_release_regions);