blob: a56fa2a1e9aaf74b772a19fc8a00538933b71974 [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>
Ulf Hanssonf48c7672014-09-29 13:58:47 +020018#include <linux/pm_domain.h>
Russell Kinga62c80e2006-01-07 13:52:45 +000019#include <linux/amba/bus.h>
Alessandro Rubinia875cfb2012-06-24 12:46:16 +010020#include <linux/sizes.h>
Antonios Motakis3cf38572015-01-06 11:15:11 +010021#include <linux/limits.h>
Stephen Boydbcd30062016-08-10 20:17:34 +010022#include <linux/clk/clk-conf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Russell King934848d2009-01-08 09:58:51 +000024#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
27
Russell Kingc862aab2011-02-19 15:55:26 +000028static const struct amba_id *
29amba_lookup(const struct amba_id *table, struct amba_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
31 int ret = 0;
32
33 while (table->mask) {
34 ret = (dev->periphid & table->mask) == table->id;
35 if (ret)
36 break;
37 table++;
38 }
39
40 return ret ? table : NULL;
41}
42
43static int amba_match(struct device *dev, struct device_driver *drv)
44{
45 struct amba_device *pcdev = to_amba_device(dev);
46 struct amba_driver *pcdrv = to_amba_driver(drv);
47
Antonios Motakis3cf38572015-01-06 11:15:11 +010048 /* When driver_override is set, only bind to the matching driver */
49 if (pcdev->driver_override)
50 return !strcmp(pcdev->driver_override, drv->name);
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return amba_lookup(pcdrv->id_table, pcdev) != NULL;
53}
54
Kay Sievers7eff2e72007-08-14 15:15:12 +020055static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
57 struct amba_device *pcdev = to_amba_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +020058 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Kay Sievers7eff2e72007-08-14 15:15:12 +020060 retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
Dave Martin523817b2011-10-05 14:44:57 +010061 if (retval)
62 return retval;
63
64 retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
Eric Rannaudbf624562007-03-30 22:23:12 -070065 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Antonios Motakis3cf38572015-01-06 11:15:11 +010068static ssize_t driver_override_show(struct device *_dev,
69 struct device_attribute *attr, char *buf)
70{
71 struct amba_device *dev = to_amba_device(_dev);
72
73 if (!dev->driver_override)
74 return 0;
75
76 return sprintf(buf, "%s\n", dev->driver_override);
77}
78
79static ssize_t driver_override_store(struct device *_dev,
80 struct device_attribute *attr,
81 const char *buf, size_t count)
82{
83 struct amba_device *dev = to_amba_device(_dev);
84 char *driver_override, *old = dev->driver_override, *cp;
85
86 if (count > PATH_MAX)
87 return -EINVAL;
88
89 driver_override = kstrndup(buf, count, GFP_KERNEL);
90 if (!driver_override)
91 return -ENOMEM;
92
93 cp = strchr(driver_override, '\n');
94 if (cp)
95 *cp = '\0';
96
97 if (strlen(driver_override)) {
98 dev->driver_override = driver_override;
99 } else {
100 kfree(driver_override);
101 dev->driver_override = NULL;
102 }
103
104 kfree(old);
105
106 return count;
107}
108
Russell King96b13f52006-11-30 14:04:49 +0000109#define amba_attr_func(name,fmt,arg...) \
110static ssize_t name##_show(struct device *_dev, \
111 struct device_attribute *attr, char *buf) \
112{ \
113 struct amba_device *dev = to_amba_device(_dev); \
114 return sprintf(buf, fmt, arg); \
115}
116
117#define amba_attr(name,fmt,arg...) \
118amba_attr_func(name,fmt,arg) \
119static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
120
121amba_attr_func(id, "%08x\n", dev->periphid);
122amba_attr(irq0, "%u\n", dev->irq[0]);
123amba_attr(irq1, "%u\n", dev->irq[1]);
124amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
125 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
126 dev->res.flags);
127
128static struct device_attribute amba_dev_attrs[] = {
129 __ATTR_RO(id),
130 __ATTR_RO(resource),
Antonios Motakis3cf38572015-01-06 11:15:11 +0100131 __ATTR_RW(driver_override),
Russell King96b13f52006-11-30 14:04:49 +0000132 __ATTR_NULL,
133};
134
Ulf Hanssonf210c532014-02-12 14:06:43 +0100135#ifdef CONFIG_PM
Russell King92b97f02011-08-14 09:13:48 +0100136/*
137 * Hooks to provide runtime PM of the pclk (bus clock). It is safe to
138 * enable/disable the bus clock at runtime PM suspend/resume as this
Mark Brown1e458602012-04-13 13:11:50 +0100139 * does not result in loss of context.
Russell King92b97f02011-08-14 09:13:48 +0100140 */
141static int amba_pm_runtime_suspend(struct device *dev)
142{
143 struct amba_device *pcdev = to_amba_device(dev);
144 int ret = pm_generic_runtime_suspend(dev);
145
Krzysztof Kozlowski5670c2a2014-11-14 09:48:27 +0100146 if (ret == 0 && dev->driver) {
147 if (pm_runtime_is_irq_safe(dev))
148 clk_disable(pcdev->pclk);
149 else
150 clk_disable_unprepare(pcdev->pclk);
151 }
Russell King92b97f02011-08-14 09:13:48 +0100152
153 return ret;
154}
155
156static int amba_pm_runtime_resume(struct device *dev)
157{
158 struct amba_device *pcdev = to_amba_device(dev);
159 int ret;
160
161 if (dev->driver) {
Krzysztof Kozlowski5670c2a2014-11-14 09:48:27 +0100162 if (pm_runtime_is_irq_safe(dev))
163 ret = clk_enable(pcdev->pclk);
164 else
165 ret = clk_prepare_enable(pcdev->pclk);
Russell King92b97f02011-08-14 09:13:48 +0100166 /* Failure is probably fatal to the system, but... */
167 if (ret)
168 return ret;
169 }
170
171 return pm_generic_runtime_resume(dev);
172}
Krzysztof Kozlowski5670c2a2014-11-14 09:48:27 +0100173#endif /* CONFIG_PM */
Russell King92b97f02011-08-14 09:13:48 +0100174
Rabin Vincentba74ec72011-02-23 04:33:17 +0100175static const struct dev_pm_ops amba_pm = {
Ulf Hansson26825cf2013-12-09 10:38:20 +0100176 .suspend = pm_generic_suspend,
177 .resume = pm_generic_resume,
178 .freeze = pm_generic_freeze,
179 .thaw = pm_generic_thaw,
180 .poweroff = pm_generic_poweroff,
181 .restore = pm_generic_restore,
Rafael J. Wysocki6ed23b82014-12-04 00:34:11 +0100182 SET_RUNTIME_PM_OPS(
Russell King92b97f02011-08-14 09:13:48 +0100183 amba_pm_runtime_suspend,
184 amba_pm_runtime_resume,
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +0200185 NULL
Rabin Vincentba74ec72011-02-23 04:33:17 +0100186 )
187};
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189/*
190 * Primecells are part of the Advanced Microcontroller Bus Architecture,
191 * so we call the bus "amba".
192 */
Rob Herring394d5ae2011-02-12 15:58:25 +0100193struct bus_type amba_bustype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 .name = "amba",
Russell King96b13f52006-11-30 14:04:49 +0000195 .dev_attrs = amba_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 .match = amba_match,
Paul Jackson6d20b032005-11-25 20:04:26 -0800197 .uevent = amba_uevent,
Ulf Hansson26825cf2013-12-09 10:38:20 +0100198 .pm = &amba_pm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199};
200
201static int __init amba_init(void)
202{
203 return bus_register(&amba_bustype);
204}
205
206postcore_initcall(amba_init);
207
Russell King7cfe2492010-07-15 10:47:14 +0100208static int amba_get_enable_pclk(struct amba_device *pcdev)
209{
Russell King7cfe2492010-07-15 10:47:14 +0100210 int ret;
211
Ulf Hansson89a5c982013-12-09 10:39:13 +0100212 pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk");
213 if (IS_ERR(pcdev->pclk))
214 return PTR_ERR(pcdev->pclk);
Russell King7cfe2492010-07-15 10:47:14 +0100215
Ulf Hansson89a5c982013-12-09 10:39:13 +0100216 ret = clk_prepare_enable(pcdev->pclk);
217 if (ret)
218 clk_put(pcdev->pclk);
Russell King7cfe2492010-07-15 10:47:14 +0100219
220 return ret;
221}
222
223static void amba_put_disable_pclk(struct amba_device *pcdev)
224{
Ulf Hansson89a5c982013-12-09 10:39:13 +0100225 clk_disable_unprepare(pcdev->pclk);
226 clk_put(pcdev->pclk);
Russell King7cfe2492010-07-15 10:47:14 +0100227}
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229/*
230 * These are the device model conversion veneers; they convert the
231 * device model structures to our more specific structures.
232 */
233static int amba_probe(struct device *dev)
234{
235 struct amba_device *pcdev = to_amba_device(dev);
236 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
Russell Kingc862aab2011-02-19 15:55:26 +0000237 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
Russell King7cfe2492010-07-15 10:47:14 +0100238 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Russell King7cfe2492010-07-15 10:47:14 +0100240 do {
Stephen Boydbcd30062016-08-10 20:17:34 +0100241 ret = of_clk_set_defaults(dev->of_node, false);
242 if (ret < 0)
243 break;
244
Ulf Hansson207f1a22014-09-19 20:27:42 +0200245 ret = dev_pm_domain_attach(dev, true);
246 if (ret == -EPROBE_DEFER)
Russell King7cfe2492010-07-15 10:47:14 +0100247 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Ulf Hansson207f1a22014-09-19 20:27:42 +0200249 ret = amba_get_enable_pclk(pcdev);
250 if (ret) {
251 dev_pm_domain_detach(dev, true);
252 break;
253 }
254
Russell King92b97f02011-08-14 09:13:48 +0100255 pm_runtime_get_noresume(dev);
256 pm_runtime_set_active(dev);
257 pm_runtime_enable(dev);
258
Russell King7cfe2492010-07-15 10:47:14 +0100259 ret = pcdrv->probe(pcdev, id);
260 if (ret == 0)
261 break;
262
Russell King92b97f02011-08-14 09:13:48 +0100263 pm_runtime_disable(dev);
264 pm_runtime_set_suspended(dev);
265 pm_runtime_put_noidle(dev);
266
Russell King7cfe2492010-07-15 10:47:14 +0100267 amba_put_disable_pclk(pcdev);
Ulf Hansson207f1a22014-09-19 20:27:42 +0200268 dev_pm_domain_detach(dev, true);
Russell King7cfe2492010-07-15 10:47:14 +0100269 } while (0);
270
271 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
274static int amba_remove(struct device *dev)
275{
Russell King7cfe2492010-07-15 10:47:14 +0100276 struct amba_device *pcdev = to_amba_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct amba_driver *drv = to_amba_driver(dev->driver);
Russell King92b97f02011-08-14 09:13:48 +0100278 int ret;
279
280 pm_runtime_get_sync(dev);
281 ret = drv->remove(pcdev);
282 pm_runtime_put_noidle(dev);
283
284 /* Undo the runtime PM settings in amba_probe() */
285 pm_runtime_disable(dev);
286 pm_runtime_set_suspended(dev);
287 pm_runtime_put_noidle(dev);
Russell King7cfe2492010-07-15 10:47:14 +0100288
289 amba_put_disable_pclk(pcdev);
Ulf Hansson207f1a22014-09-19 20:27:42 +0200290 dev_pm_domain_detach(dev, true);
Russell King7cfe2492010-07-15 10:47:14 +0100291
292 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
295static void amba_shutdown(struct device *dev)
296{
297 struct amba_driver *drv = to_amba_driver(dev->driver);
298 drv->shutdown(to_amba_device(dev));
299}
300
301/**
302 * amba_driver_register - register an AMBA device driver
303 * @drv: amba device driver structure
304 *
305 * Register an AMBA device driver with the Linux device model
306 * core. If devices pre-exist, the drivers probe function will
307 * be called.
308 */
309int amba_driver_register(struct amba_driver *drv)
310{
311 drv->drv.bus = &amba_bustype;
312
313#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
314 SETFN(probe);
315 SETFN(remove);
316 SETFN(shutdown);
317
318 return driver_register(&drv->drv);
319}
320
321/**
322 * amba_driver_unregister - remove an AMBA device driver
323 * @drv: AMBA device driver structure to remove
324 *
325 * Unregister an AMBA device driver from the Linux device
326 * model. The device model will call the drivers remove function
327 * for each device the device driver is currently handling.
328 */
329void amba_driver_unregister(struct amba_driver *drv)
330{
331 driver_unregister(&drv->drv);
332}
333
334
335static void amba_device_release(struct device *dev)
336{
337 struct amba_device *d = to_amba_device(dev);
338
339 if (d->res.parent)
340 release_resource(&d->res);
341 kfree(d);
342}
343
Marek Szyprowskia41980f2016-04-21 07:58:35 +0100344static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
Leo Chen8afe0b92009-07-28 23:34:59 +0100346 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 void __iomem *tmp;
348 int i, ret;
349
Russell King2eac58d2011-12-18 11:43:56 +0000350 WARN_ON(dev->irq[0] == (unsigned int)-1);
351 WARN_ON(dev->irq[1] == (unsigned int)-1);
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 ret = request_resource(parent, &dev->res);
Russell King96b13f52006-11-30 14:04:49 +0000354 if (ret)
355 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Linus Walleij97ceed12011-03-24 16:12:40 +0100357 /* Hard-coded primecell ID instead of plug-n-play */
358 if (dev->periphid != 0)
359 goto skip_probe;
360
Leo Chen8afe0b92009-07-28 23:34:59 +0100361 /*
362 * Dynamically calculate the size of the resource
363 * and use this for iomap
364 */
365 size = resource_size(&dev->res);
366 tmp = ioremap(dev->res.start, size);
Russell King96b13f52006-11-30 14:04:49 +0000367 if (!tmp) {
368 ret = -ENOMEM;
369 goto err_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
Russell King96b13f52006-11-30 14:04:49 +0000371
Marek Szyprowskia41980f2016-04-21 07:58:35 +0100372 ret = dev_pm_domain_attach(&dev->dev, true);
373 if (ret == -EPROBE_DEFER) {
374 iounmap(tmp);
375 goto err_release;
376 }
377
Russell King7cfe2492010-07-15 10:47:14 +0100378 ret = amba_get_enable_pclk(dev);
379 if (ret == 0) {
380 u32 pid, cid;
381
382 /*
383 * Read pid and cid based on size of resource
384 * they are located at end of region
385 */
386 for (pid = 0, i = 0; i < 4; i++)
387 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
388 (i * 8);
389 for (cid = 0, i = 0; i < 4; i++)
390 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
391 (i * 8);
392
393 amba_put_disable_pclk(dev);
394
Pratik Patela06ae862014-11-03 11:07:35 -0700395 if (cid == AMBA_CID || cid == CORESIGHT_CID)
Russell King7cfe2492010-07-15 10:47:14 +0100396 dev->periphid = pid;
397
398 if (!dev->periphid)
399 ret = -ENODEV;
400 }
Russell King96b13f52006-11-30 14:04:49 +0000401
402 iounmap(tmp);
Marek Szyprowskia41980f2016-04-21 07:58:35 +0100403 dev_pm_domain_detach(&dev->dev, true);
Russell King96b13f52006-11-30 14:04:49 +0000404
Russell King7cfe2492010-07-15 10:47:14 +0100405 if (ret)
Russell King96b13f52006-11-30 14:04:49 +0000406 goto err_release;
Russell King96b13f52006-11-30 14:04:49 +0000407
Linus Walleij97ceed12011-03-24 16:12:40 +0100408 skip_probe:
Russell King557dca52009-07-05 22:39:08 +0100409 ret = device_add(&dev->dev);
Russell King96b13f52006-11-30 14:04:49 +0000410 if (ret)
411 goto err_release;
412
Russell Kingdfb851852012-05-03 11:33:15 +0100413 if (dev->irq[0])
Russell King96b13f52006-11-30 14:04:49 +0000414 ret = device_create_file(&dev->dev, &dev_attr_irq0);
Russell Kingdfb851852012-05-03 11:33:15 +0100415 if (ret == 0 && dev->irq[1])
Russell King96b13f52006-11-30 14:04:49 +0000416 ret = device_create_file(&dev->dev, &dev_attr_irq1);
417 if (ret == 0)
418 return ret;
419
420 device_unregister(&dev->dev);
421
422 err_release:
423 release_resource(&dev->res);
424 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 return ret;
426}
Marek Szyprowskia41980f2016-04-21 07:58:35 +0100427
428/*
429 * Registration of AMBA device require reading its pid and cid registers.
430 * To do this, the device must be turned on (if it is a part of power domain)
431 * and have clocks enabled. However in some cases those resources might not be
432 * yet available. Returning EPROBE_DEFER is not a solution in such case,
433 * because callers don't handle this special error code. Instead such devices
434 * are added to the special list and their registration is retried from
435 * periodic worker, until all resources are available and registration succeeds.
436 */
437struct deferred_device {
438 struct amba_device *dev;
439 struct resource *parent;
440 struct list_head node;
441};
442
443static LIST_HEAD(deferred_devices);
444static DEFINE_MUTEX(deferred_devices_lock);
445
446static void amba_deferred_retry_func(struct work_struct *dummy);
447static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func);
448
449#define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000))
450
451static void amba_deferred_retry_func(struct work_struct *dummy)
452{
453 struct deferred_device *ddev, *tmp;
454
455 mutex_lock(&deferred_devices_lock);
456
457 list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) {
458 int ret = amba_device_try_add(ddev->dev, ddev->parent);
459
460 if (ret == -EPROBE_DEFER)
461 continue;
462
463 list_del_init(&ddev->node);
464 kfree(ddev);
465 }
466
467 if (!list_empty(&deferred_devices))
468 schedule_delayed_work(&deferred_retry_work,
469 DEFERRED_DEVICE_TIMEOUT);
470
471 mutex_unlock(&deferred_devices_lock);
472}
473
474/**
475 * amba_device_add - add a previously allocated AMBA device structure
476 * @dev: AMBA device allocated by amba_device_alloc
477 * @parent: resource parent for this devices resources
478 *
479 * Claim the resource, and read the device cell ID if not already
480 * initialized. Register the AMBA device with the Linux device
481 * manager.
482 */
483int amba_device_add(struct amba_device *dev, struct resource *parent)
484{
485 int ret = amba_device_try_add(dev, parent);
486
487 if (ret == -EPROBE_DEFER) {
488 struct deferred_device *ddev;
489
490 ddev = kmalloc(sizeof(*ddev), GFP_KERNEL);
491 if (!ddev)
492 return -ENOMEM;
493
494 ddev->dev = dev;
495 ddev->parent = parent;
496 ret = 0;
497
498 mutex_lock(&deferred_devices_lock);
499
500 if (list_empty(&deferred_devices))
501 schedule_delayed_work(&deferred_retry_work,
502 DEFERRED_DEVICE_TIMEOUT);
503 list_add_tail(&ddev->node, &deferred_devices);
504
505 mutex_unlock(&deferred_devices_lock);
506 }
507 return ret;
508}
Russell Kingd5dc9272011-12-18 11:07:47 +0000509EXPORT_SYMBOL_GPL(amba_device_add);
510
Linus Walleij6026aa92012-04-03 11:58:42 +0100511static struct amba_device *
512amba_aphb_device_add(struct device *parent, const char *name,
513 resource_size_t base, size_t size, int irq1, int irq2,
Linus Walleij3ad909b2012-11-30 16:30:43 +0100514 void *pdata, unsigned int periphid, u64 dma_mask,
515 struct resource *resbase)
Linus Walleij6026aa92012-04-03 11:58:42 +0100516{
517 struct amba_device *dev;
518 int ret;
519
520 dev = amba_device_alloc(name, base, size);
521 if (!dev)
522 return ERR_PTR(-ENOMEM);
523
Linus Walleij6026aa92012-04-03 11:58:42 +0100524 dev->dev.coherent_dma_mask = dma_mask;
525 dev->irq[0] = irq1;
526 dev->irq[1] = irq2;
527 dev->periphid = periphid;
528 dev->dev.platform_data = pdata;
529 dev->dev.parent = parent;
530
Linus Walleij3ad909b2012-11-30 16:30:43 +0100531 ret = amba_device_add(dev, resbase);
Linus Walleij6026aa92012-04-03 11:58:42 +0100532 if (ret) {
533 amba_device_put(dev);
534 return ERR_PTR(ret);
535 }
536
537 return dev;
538}
539
540struct amba_device *
541amba_apb_device_add(struct device *parent, const char *name,
542 resource_size_t base, size_t size, int irq1, int irq2,
543 void *pdata, unsigned int periphid)
544{
545 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
Linus Walleij3ad909b2012-11-30 16:30:43 +0100546 periphid, 0, &iomem_resource);
Linus Walleij6026aa92012-04-03 11:58:42 +0100547}
548EXPORT_SYMBOL_GPL(amba_apb_device_add);
549
550struct amba_device *
551amba_ahb_device_add(struct device *parent, const char *name,
552 resource_size_t base, size_t size, int irq1, int irq2,
553 void *pdata, unsigned int periphid)
554{
555 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
Linus Walleij3ad909b2012-11-30 16:30:43 +0100556 periphid, ~0ULL, &iomem_resource);
Linus Walleij6026aa92012-04-03 11:58:42 +0100557}
558EXPORT_SYMBOL_GPL(amba_ahb_device_add);
559
Linus Walleij3ad909b2012-11-30 16:30:43 +0100560struct amba_device *
561amba_apb_device_add_res(struct device *parent, const char *name,
562 resource_size_t base, size_t size, int irq1,
563 int irq2, void *pdata, unsigned int periphid,
564 struct resource *resbase)
565{
566 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
567 periphid, 0, resbase);
568}
569EXPORT_SYMBOL_GPL(amba_apb_device_add_res);
570
571struct amba_device *
572amba_ahb_device_add_res(struct device *parent, const char *name,
573 resource_size_t base, size_t size, int irq1,
574 int irq2, void *pdata, unsigned int periphid,
575 struct resource *resbase)
576{
577 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
578 periphid, ~0ULL, resbase);
579}
580EXPORT_SYMBOL_GPL(amba_ahb_device_add_res);
581
582
Russell Kingd5dc9272011-12-18 11:07:47 +0000583static void amba_device_initialize(struct amba_device *dev, const char *name)
584{
585 device_initialize(&dev->dev);
586 if (name)
587 dev_set_name(&dev->dev, "%s", name);
588 dev->dev.release = amba_device_release;
589 dev->dev.bus = &amba_bustype;
Russell King446b2a92013-06-27 10:25:33 +0100590 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
Russell Kingd5dc9272011-12-18 11:07:47 +0000591 dev->res.name = dev_name(&dev->dev);
592}
593
594/**
595 * amba_device_alloc - allocate an AMBA device
596 * @name: sysfs name of the AMBA device
597 * @base: base of AMBA device
598 * @size: size of AMBA device
599 *
600 * Allocate and initialize an AMBA device structure. Returns %NULL
601 * on failure.
602 */
603struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
604 size_t size)
605{
606 struct amba_device *dev;
607
608 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
609 if (dev) {
610 amba_device_initialize(dev, name);
611 dev->res.start = base;
612 dev->res.end = base + size - 1;
613 dev->res.flags = IORESOURCE_MEM;
614 }
615
616 return dev;
617}
618EXPORT_SYMBOL_GPL(amba_device_alloc);
619
620/**
621 * amba_device_register - register an AMBA device
622 * @dev: AMBA device to register
623 * @parent: parent memory resource
624 *
625 * Setup the AMBA device, reading the cell ID if present.
626 * Claim the resource, and register the AMBA device with
627 * the Linux device manager.
628 */
629int amba_device_register(struct amba_device *dev, struct resource *parent)
630{
631 amba_device_initialize(dev, dev->dev.init_name);
632 dev->dev.init_name = NULL;
633
Russell Kingd5dc9272011-12-18 11:07:47 +0000634 return amba_device_add(dev, parent);
635}
636
637/**
638 * amba_device_put - put an AMBA device
639 * @dev: AMBA device to put
640 */
641void amba_device_put(struct amba_device *dev)
642{
643 put_device(&dev->dev);
644}
645EXPORT_SYMBOL_GPL(amba_device_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
647/**
648 * amba_device_unregister - unregister an AMBA device
649 * @dev: AMBA device to remove
650 *
651 * Remove the specified AMBA device from the Linux device
652 * manager. All files associated with this object will be
653 * destroyed, and device drivers notified that the device has
654 * been removed. The AMBA device's resources including
655 * the amba_device structure will be freed once all
656 * references to it have been dropped.
657 */
658void amba_device_unregister(struct amba_device *dev)
659{
660 device_unregister(&dev->dev);
661}
662
663
664struct find_data {
665 struct amba_device *dev;
666 struct device *parent;
667 const char *busid;
668 unsigned int id;
669 unsigned int mask;
670};
671
672static int amba_find_match(struct device *dev, void *data)
673{
674 struct find_data *d = data;
675 struct amba_device *pcdev = to_amba_device(dev);
676 int r;
677
678 r = (pcdev->periphid & d->mask) == d->id;
679 if (d->parent)
680 r &= d->parent == dev->parent;
681 if (d->busid)
Kay Sievers9d6b4c82009-03-24 16:38:22 -0700682 r &= strcmp(dev_name(dev), d->busid) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 if (r) {
685 get_device(dev);
686 d->dev = pcdev;
687 }
688
689 return r;
690}
691
692/**
693 * amba_find_device - locate an AMBA device given a bus id
694 * @busid: bus id for device (or NULL)
695 * @parent: parent device (or NULL)
696 * @id: peripheral ID (or 0)
697 * @mask: peripheral ID mask (or 0)
698 *
699 * Return the AMBA device corresponding to the supplied parameters.
700 * If no device matches, returns NULL.
701 *
702 * NOTE: When a valid device is found, its refcount is
703 * incremented, and must be decremented before the returned
704 * reference.
705 */
706struct amba_device *
707amba_find_device(const char *busid, struct device *parent, unsigned int id,
708 unsigned int mask)
709{
710 struct find_data data;
711
712 data.dev = NULL;
713 data.parent = parent;
714 data.busid = busid;
715 data.id = id;
716 data.mask = mask;
717
718 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
719
720 return data.dev;
721}
722
723/**
724 * amba_request_regions - request all mem regions associated with device
725 * @dev: amba_device structure for device
726 * @name: name, or NULL to use driver name
727 */
728int amba_request_regions(struct amba_device *dev, const char *name)
729{
730 int ret = 0;
Leo Chen8afe0b92009-07-28 23:34:59 +0100731 u32 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733 if (!name)
734 name = dev->dev.driver->name;
735
Leo Chen8afe0b92009-07-28 23:34:59 +0100736 size = resource_size(&dev->res);
737
738 if (!request_mem_region(dev->res.start, size, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 ret = -EBUSY;
740
741 return ret;
742}
743
744/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300745 * amba_release_regions - release mem regions associated with device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 * @dev: amba_device structure for device
747 *
748 * Release regions claimed by a successful call to amba_request_regions.
749 */
750void amba_release_regions(struct amba_device *dev)
751{
Leo Chen8afe0b92009-07-28 23:34:59 +0100752 u32 size;
753
754 size = resource_size(&dev->res);
755 release_mem_region(dev->res.start, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
758EXPORT_SYMBOL(amba_driver_register);
759EXPORT_SYMBOL(amba_driver_unregister);
760EXPORT_SYMBOL(amba_device_register);
761EXPORT_SYMBOL(amba_device_unregister);
762EXPORT_SYMBOL(amba_find_device);
763EXPORT_SYMBOL(amba_request_regions);
764EXPORT_SYMBOL(amba_release_regions);