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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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> | |
4e57b681 TS |
13 | #include <linux/string.h> |
14 | #include <linux/slab.h> | |
934848da | 15 | #include <linux/io.h> |
ba74ec7f RV |
16 | #include <linux/pm.h> |
17 | #include <linux/pm_runtime.h> | |
f48c767c | 18 | #include <linux/pm_domain.h> |
a62c80e5 | 19 | #include <linux/amba/bus.h> |
a875cfbb | 20 | #include <linux/sizes.h> |
3cf38571 | 21 | #include <linux/limits.h> |
bcd3006f | 22 | #include <linux/clk/clk-conf.h> |
1da177e4 | 23 | |
934848da | 24 | #include <asm/irq.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
27 | ||
c862aab0 RK |
28 | static const struct amba_id * |
29 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
30 | { |
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 | ||
43 | static 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 | ||
3cf38571 AM |
48 | /* 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 | ||
1da177e4 LT |
52 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; |
53 | } | |
54 | ||
7eff2e7a | 55 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
56 | { |
57 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 58 | int retval = 0; |
1da177e4 | 59 | |
7eff2e7a | 60 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
61 | if (retval) |
62 | return retval; | |
63 | ||
64 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 65 | return retval; |
1da177e4 | 66 | } |
1da177e4 | 67 | |
3cf38571 AM |
68 | static 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 | ||
79 | static 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 | } | |
966449a3 | 108 | static DEVICE_ATTR_RW(driver_override); |
3cf38571 | 109 | |
96b13f5c RK |
110 | #define amba_attr_func(name,fmt,arg...) \ |
111 | static ssize_t name##_show(struct device *_dev, \ | |
112 | struct device_attribute *attr, char *buf) \ | |
113 | { \ | |
114 | struct amba_device *dev = to_amba_device(_dev); \ | |
115 | return sprintf(buf, fmt, arg); \ | |
966449a3 GKH |
116 | } \ |
117 | static DEVICE_ATTR_RO(name) | |
96b13f5c RK |
118 | |
119 | amba_attr_func(id, "%08x\n", dev->periphid); | |
966449a3 GKH |
120 | amba_attr_func(irq0, "%u\n", dev->irq[0]); |
121 | amba_attr_func(irq1, "%u\n", dev->irq[1]); | |
96b13f5c RK |
122 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
123 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
124 | dev->res.flags); | |
125 | ||
966449a3 GKH |
126 | static struct attribute *amba_dev_attrs[] = { |
127 | &dev_attr_id.attr, | |
128 | &dev_attr_resource.attr, | |
129 | &dev_attr_driver_override.attr, | |
130 | NULL, | |
96b13f5c | 131 | }; |
966449a3 | 132 | ATTRIBUTE_GROUPS(amba_dev); |
96b13f5c | 133 | |
f210c53a | 134 | #ifdef CONFIG_PM |
92b97f0a RK |
135 | /* |
136 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
137 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 138 | * does not result in loss of context. |
92b97f0a RK |
139 | */ |
140 | static int amba_pm_runtime_suspend(struct device *dev) | |
141 | { | |
142 | struct amba_device *pcdev = to_amba_device(dev); | |
143 | int ret = pm_generic_runtime_suspend(dev); | |
144 | ||
5670c2a5 KK |
145 | if (ret == 0 && dev->driver) { |
146 | if (pm_runtime_is_irq_safe(dev)) | |
147 | clk_disable(pcdev->pclk); | |
148 | else | |
149 | clk_disable_unprepare(pcdev->pclk); | |
150 | } | |
92b97f0a RK |
151 | |
152 | return ret; | |
153 | } | |
154 | ||
155 | static int amba_pm_runtime_resume(struct device *dev) | |
156 | { | |
157 | struct amba_device *pcdev = to_amba_device(dev); | |
158 | int ret; | |
159 | ||
160 | if (dev->driver) { | |
5670c2a5 KK |
161 | if (pm_runtime_is_irq_safe(dev)) |
162 | ret = clk_enable(pcdev->pclk); | |
163 | else | |
164 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
165 | /* Failure is probably fatal to the system, but... */ |
166 | if (ret) | |
167 | return ret; | |
168 | } | |
169 | ||
170 | return pm_generic_runtime_resume(dev); | |
171 | } | |
5670c2a5 | 172 | #endif /* CONFIG_PM */ |
92b97f0a | 173 | |
ba74ec7f | 174 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
175 | .suspend = pm_generic_suspend, |
176 | .resume = pm_generic_resume, | |
177 | .freeze = pm_generic_freeze, | |
178 | .thaw = pm_generic_thaw, | |
179 | .poweroff = pm_generic_poweroff, | |
180 | .restore = pm_generic_restore, | |
6ed23b80 | 181 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
182 | amba_pm_runtime_suspend, |
183 | amba_pm_runtime_resume, | |
45f0a85c | 184 | NULL |
ba74ec7f RV |
185 | ) |
186 | }; | |
187 | ||
1da177e4 LT |
188 | /* |
189 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
190 | * so we call the bus "amba". | |
191 | */ | |
394d5aef | 192 | struct bus_type amba_bustype = { |
1da177e4 | 193 | .name = "amba", |
966449a3 | 194 | .dev_groups = amba_dev_groups, |
1da177e4 | 195 | .match = amba_match, |
6d20b035 | 196 | .uevent = amba_uevent, |
26825cfd | 197 | .pm = &amba_pm, |
1da177e4 LT |
198 | }; |
199 | ||
200 | static int __init amba_init(void) | |
201 | { | |
202 | return bus_register(&amba_bustype); | |
203 | } | |
204 | ||
205 | postcore_initcall(amba_init); | |
206 | ||
7cfe2494 RK |
207 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
208 | { | |
7cfe2494 RK |
209 | int ret; |
210 | ||
89a5c985 UH |
211 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
212 | if (IS_ERR(pcdev->pclk)) | |
213 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 214 | |
89a5c985 UH |
215 | ret = clk_prepare_enable(pcdev->pclk); |
216 | if (ret) | |
217 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
218 | |
219 | return ret; | |
220 | } | |
221 | ||
222 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
223 | { | |
89a5c985 UH |
224 | clk_disable_unprepare(pcdev->pclk); |
225 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
226 | } |
227 | ||
1da177e4 LT |
228 | /* |
229 | * These are the device model conversion veneers; they convert the | |
230 | * device model structures to our more specific structures. | |
231 | */ | |
232 | static int amba_probe(struct device *dev) | |
233 | { | |
234 | struct amba_device *pcdev = to_amba_device(dev); | |
235 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 236 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 237 | int ret; |
1da177e4 | 238 | |
7cfe2494 | 239 | do { |
bcd3006f SB |
240 | ret = of_clk_set_defaults(dev->of_node, false); |
241 | if (ret < 0) | |
242 | break; | |
243 | ||
207f1a2d UH |
244 | ret = dev_pm_domain_attach(dev, true); |
245 | if (ret == -EPROBE_DEFER) | |
246 | break; | |
247 | ||
7cfe2494 | 248 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
249 | if (ret) { |
250 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 251 | break; |
207f1a2d | 252 | } |
7cfe2494 | 253 | |
92b97f0a RK |
254 | pm_runtime_get_noresume(dev); |
255 | pm_runtime_set_active(dev); | |
256 | pm_runtime_enable(dev); | |
257 | ||
7cfe2494 RK |
258 | ret = pcdrv->probe(pcdev, id); |
259 | if (ret == 0) | |
260 | break; | |
1da177e4 | 261 | |
92b97f0a RK |
262 | pm_runtime_disable(dev); |
263 | pm_runtime_set_suspended(dev); | |
264 | pm_runtime_put_noidle(dev); | |
265 | ||
7cfe2494 | 266 | amba_put_disable_pclk(pcdev); |
207f1a2d | 267 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
268 | } while (0); |
269 | ||
270 | return ret; | |
1da177e4 LT |
271 | } |
272 | ||
273 | static int amba_remove(struct device *dev) | |
274 | { | |
7cfe2494 | 275 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 276 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
277 | int ret; |
278 | ||
279 | pm_runtime_get_sync(dev); | |
280 | ret = drv->remove(pcdev); | |
281 | pm_runtime_put_noidle(dev); | |
282 | ||
283 | /* Undo the runtime PM settings in amba_probe() */ | |
284 | pm_runtime_disable(dev); | |
285 | pm_runtime_set_suspended(dev); | |
286 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
287 | |
288 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 289 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
290 | |
291 | return ret; | |
1da177e4 LT |
292 | } |
293 | ||
294 | static void amba_shutdown(struct device *dev) | |
295 | { | |
296 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
297 | drv->shutdown(to_amba_device(dev)); | |
298 | } | |
299 | ||
300 | /** | |
301 | * amba_driver_register - register an AMBA device driver | |
302 | * @drv: amba device driver structure | |
303 | * | |
304 | * Register an AMBA device driver with the Linux device model | |
305 | * core. If devices pre-exist, the drivers probe function will | |
306 | * be called. | |
307 | */ | |
308 | int amba_driver_register(struct amba_driver *drv) | |
309 | { | |
310 | drv->drv.bus = &amba_bustype; | |
311 | ||
312 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
313 | SETFN(probe); | |
314 | SETFN(remove); | |
315 | SETFN(shutdown); | |
316 | ||
317 | return driver_register(&drv->drv); | |
318 | } | |
319 | ||
320 | /** | |
321 | * amba_driver_unregister - remove an AMBA device driver | |
322 | * @drv: AMBA device driver structure to remove | |
323 | * | |
324 | * Unregister an AMBA device driver from the Linux device | |
325 | * model. The device model will call the drivers remove function | |
326 | * for each device the device driver is currently handling. | |
327 | */ | |
328 | void amba_driver_unregister(struct amba_driver *drv) | |
329 | { | |
330 | driver_unregister(&drv->drv); | |
331 | } | |
332 | ||
333 | ||
334 | static void amba_device_release(struct device *dev) | |
335 | { | |
336 | struct amba_device *d = to_amba_device(dev); | |
337 | ||
338 | if (d->res.parent) | |
339 | release_resource(&d->res); | |
340 | kfree(d); | |
341 | } | |
342 | ||
a41980f2 | 343 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 344 | { |
8afe0b96 | 345 | u32 size; |
1da177e4 LT |
346 | void __iomem *tmp; |
347 | int i, ret; | |
348 | ||
2eac58d5 RK |
349 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
350 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
351 | ||
1da177e4 | 352 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
353 | if (ret) |
354 | goto err_out; | |
355 | ||
97ceed1f LW |
356 | /* Hard-coded primecell ID instead of plug-n-play */ |
357 | if (dev->periphid != 0) | |
358 | goto skip_probe; | |
359 | ||
8afe0b96 LC |
360 | /* |
361 | * Dynamically calculate the size of the resource | |
362 | * and use this for iomap | |
363 | */ | |
364 | size = resource_size(&dev->res); | |
365 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
366 | if (!tmp) { |
367 | ret = -ENOMEM; | |
368 | goto err_release; | |
1da177e4 | 369 | } |
96b13f5c | 370 | |
a41980f2 MS |
371 | ret = dev_pm_domain_attach(&dev->dev, true); |
372 | if (ret == -EPROBE_DEFER) { | |
373 | iounmap(tmp); | |
374 | goto err_release; | |
375 | } | |
376 | ||
7cfe2494 RK |
377 | ret = amba_get_enable_pclk(dev); |
378 | if (ret == 0) { | |
379 | u32 pid, cid; | |
96b13f5c | 380 | |
7cfe2494 RK |
381 | /* |
382 | * Read pid and cid based on size of resource | |
383 | * they are located at end of region | |
384 | */ | |
385 | for (pid = 0, i = 0; i < 4; i++) | |
386 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
387 | (i * 8); | |
388 | for (cid = 0, i = 0; i < 4; i++) | |
389 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
390 | (i * 8); | |
96b13f5c | 391 | |
7cfe2494 | 392 | amba_put_disable_pclk(dev); |
96b13f5c | 393 | |
a06ae860 | 394 | if (cid == AMBA_CID || cid == CORESIGHT_CID) |
7cfe2494 RK |
395 | dev->periphid = pid; |
396 | ||
397 | if (!dev->periphid) | |
398 | ret = -ENODEV; | |
96b13f5c RK |
399 | } |
400 | ||
7cfe2494 | 401 | iounmap(tmp); |
a41980f2 | 402 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
403 | |
404 | if (ret) | |
405 | goto err_release; | |
406 | ||
97ceed1f | 407 | skip_probe: |
557dca5f | 408 | ret = device_add(&dev->dev); |
96b13f5c RK |
409 | if (ret) |
410 | goto err_release; | |
411 | ||
dfb85185 | 412 | if (dev->irq[0]) |
96b13f5c | 413 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 414 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
415 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
416 | if (ret == 0) | |
417 | return ret; | |
418 | ||
419 | device_unregister(&dev->dev); | |
420 | ||
421 | err_release: | |
422 | release_resource(&dev->res); | |
423 | err_out: | |
1da177e4 LT |
424 | return ret; |
425 | } | |
a41980f2 MS |
426 | |
427 | /* | |
428 | * Registration of AMBA device require reading its pid and cid registers. | |
429 | * To do this, the device must be turned on (if it is a part of power domain) | |
430 | * and have clocks enabled. However in some cases those resources might not be | |
431 | * yet available. Returning EPROBE_DEFER is not a solution in such case, | |
432 | * because callers don't handle this special error code. Instead such devices | |
433 | * are added to the special list and their registration is retried from | |
434 | * periodic worker, until all resources are available and registration succeeds. | |
435 | */ | |
436 | struct deferred_device { | |
437 | struct amba_device *dev; | |
438 | struct resource *parent; | |
439 | struct list_head node; | |
440 | }; | |
441 | ||
442 | static LIST_HEAD(deferred_devices); | |
443 | static DEFINE_MUTEX(deferred_devices_lock); | |
444 | ||
445 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
446 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
447 | ||
448 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
449 | ||
450 | static void amba_deferred_retry_func(struct work_struct *dummy) | |
451 | { | |
452 | struct deferred_device *ddev, *tmp; | |
453 | ||
454 | mutex_lock(&deferred_devices_lock); | |
455 | ||
456 | list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) { | |
457 | int ret = amba_device_try_add(ddev->dev, ddev->parent); | |
458 | ||
459 | if (ret == -EPROBE_DEFER) | |
460 | continue; | |
461 | ||
462 | list_del_init(&ddev->node); | |
463 | kfree(ddev); | |
464 | } | |
465 | ||
466 | if (!list_empty(&deferred_devices)) | |
467 | schedule_delayed_work(&deferred_retry_work, | |
468 | DEFERRED_DEVICE_TIMEOUT); | |
469 | ||
470 | mutex_unlock(&deferred_devices_lock); | |
471 | } | |
472 | ||
473 | /** | |
474 | * amba_device_add - add a previously allocated AMBA device structure | |
475 | * @dev: AMBA device allocated by amba_device_alloc | |
476 | * @parent: resource parent for this devices resources | |
477 | * | |
478 | * Claim the resource, and read the device cell ID if not already | |
479 | * initialized. Register the AMBA device with the Linux device | |
480 | * manager. | |
481 | */ | |
482 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
483 | { | |
484 | int ret = amba_device_try_add(dev, parent); | |
485 | ||
486 | if (ret == -EPROBE_DEFER) { | |
487 | struct deferred_device *ddev; | |
488 | ||
489 | ddev = kmalloc(sizeof(*ddev), GFP_KERNEL); | |
490 | if (!ddev) | |
491 | return -ENOMEM; | |
492 | ||
493 | ddev->dev = dev; | |
494 | ddev->parent = parent; | |
495 | ret = 0; | |
496 | ||
497 | mutex_lock(&deferred_devices_lock); | |
498 | ||
499 | if (list_empty(&deferred_devices)) | |
500 | schedule_delayed_work(&deferred_retry_work, | |
501 | DEFERRED_DEVICE_TIMEOUT); | |
502 | list_add_tail(&ddev->node, &deferred_devices); | |
503 | ||
504 | mutex_unlock(&deferred_devices_lock); | |
505 | } | |
506 | return ret; | |
507 | } | |
d5dc9271 RK |
508 | EXPORT_SYMBOL_GPL(amba_device_add); |
509 | ||
6026aa90 LW |
510 | static struct amba_device * |
511 | amba_aphb_device_add(struct device *parent, const char *name, | |
512 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
513 | void *pdata, unsigned int periphid, u64 dma_mask, |
514 | struct resource *resbase) | |
6026aa90 LW |
515 | { |
516 | struct amba_device *dev; | |
517 | int ret; | |
518 | ||
519 | dev = amba_device_alloc(name, base, size); | |
520 | if (!dev) | |
521 | return ERR_PTR(-ENOMEM); | |
522 | ||
6026aa90 LW |
523 | dev->dev.coherent_dma_mask = dma_mask; |
524 | dev->irq[0] = irq1; | |
525 | dev->irq[1] = irq2; | |
526 | dev->periphid = periphid; | |
527 | dev->dev.platform_data = pdata; | |
528 | dev->dev.parent = parent; | |
529 | ||
3ad909bc | 530 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
531 | if (ret) { |
532 | amba_device_put(dev); | |
533 | return ERR_PTR(ret); | |
534 | } | |
535 | ||
536 | return dev; | |
537 | } | |
538 | ||
539 | struct amba_device * | |
540 | amba_apb_device_add(struct device *parent, const char *name, | |
541 | resource_size_t base, size_t size, int irq1, int irq2, | |
542 | void *pdata, unsigned int periphid) | |
543 | { | |
544 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 545 | periphid, 0, &iomem_resource); |
6026aa90 LW |
546 | } |
547 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
548 | ||
549 | struct amba_device * | |
550 | amba_ahb_device_add(struct device *parent, const char *name, | |
551 | resource_size_t base, size_t size, int irq1, int irq2, | |
552 | void *pdata, unsigned int periphid) | |
553 | { | |
554 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 555 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
556 | } |
557 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
558 | ||
3ad909bc LW |
559 | struct amba_device * |
560 | amba_apb_device_add_res(struct device *parent, const char *name, | |
561 | resource_size_t base, size_t size, int irq1, | |
562 | int irq2, void *pdata, unsigned int periphid, | |
563 | struct resource *resbase) | |
564 | { | |
565 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
566 | periphid, 0, resbase); | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
569 | ||
570 | struct amba_device * | |
571 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
572 | resource_size_t base, size_t size, int irq1, | |
573 | int irq2, void *pdata, unsigned int periphid, | |
574 | struct resource *resbase) | |
575 | { | |
576 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
577 | periphid, ~0ULL, resbase); | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
580 | ||
581 | ||
d5dc9271 RK |
582 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
583 | { | |
584 | device_initialize(&dev->dev); | |
585 | if (name) | |
586 | dev_set_name(&dev->dev, "%s", name); | |
587 | dev->dev.release = amba_device_release; | |
588 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 589 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
590 | dev->res.name = dev_name(&dev->dev); |
591 | } | |
592 | ||
593 | /** | |
594 | * amba_device_alloc - allocate an AMBA device | |
595 | * @name: sysfs name of the AMBA device | |
596 | * @base: base of AMBA device | |
597 | * @size: size of AMBA device | |
598 | * | |
599 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
600 | * on failure. | |
601 | */ | |
602 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
603 | size_t size) | |
604 | { | |
605 | struct amba_device *dev; | |
606 | ||
607 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
608 | if (dev) { | |
609 | amba_device_initialize(dev, name); | |
610 | dev->res.start = base; | |
611 | dev->res.end = base + size - 1; | |
612 | dev->res.flags = IORESOURCE_MEM; | |
613 | } | |
614 | ||
615 | return dev; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
618 | ||
619 | /** | |
620 | * amba_device_register - register an AMBA device | |
621 | * @dev: AMBA device to register | |
622 | * @parent: parent memory resource | |
623 | * | |
624 | * Setup the AMBA device, reading the cell ID if present. | |
625 | * Claim the resource, and register the AMBA device with | |
626 | * the Linux device manager. | |
627 | */ | |
628 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
629 | { | |
630 | amba_device_initialize(dev, dev->dev.init_name); | |
631 | dev->dev.init_name = NULL; | |
632 | ||
d5dc9271 RK |
633 | return amba_device_add(dev, parent); |
634 | } | |
635 | ||
636 | /** | |
637 | * amba_device_put - put an AMBA device | |
638 | * @dev: AMBA device to put | |
639 | */ | |
640 | void amba_device_put(struct amba_device *dev) | |
641 | { | |
642 | put_device(&dev->dev); | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
645 | |
646 | /** | |
647 | * amba_device_unregister - unregister an AMBA device | |
648 | * @dev: AMBA device to remove | |
649 | * | |
650 | * Remove the specified AMBA device from the Linux device | |
651 | * manager. All files associated with this object will be | |
652 | * destroyed, and device drivers notified that the device has | |
653 | * been removed. The AMBA device's resources including | |
654 | * the amba_device structure will be freed once all | |
655 | * references to it have been dropped. | |
656 | */ | |
657 | void amba_device_unregister(struct amba_device *dev) | |
658 | { | |
659 | device_unregister(&dev->dev); | |
660 | } | |
661 | ||
662 | ||
663 | struct find_data { | |
664 | struct amba_device *dev; | |
665 | struct device *parent; | |
666 | const char *busid; | |
667 | unsigned int id; | |
668 | unsigned int mask; | |
669 | }; | |
670 | ||
671 | static int amba_find_match(struct device *dev, void *data) | |
672 | { | |
673 | struct find_data *d = data; | |
674 | struct amba_device *pcdev = to_amba_device(dev); | |
675 | int r; | |
676 | ||
677 | r = (pcdev->periphid & d->mask) == d->id; | |
678 | if (d->parent) | |
679 | r &= d->parent == dev->parent; | |
680 | if (d->busid) | |
9d6b4c82 | 681 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
682 | |
683 | if (r) { | |
684 | get_device(dev); | |
685 | d->dev = pcdev; | |
686 | } | |
687 | ||
688 | return r; | |
689 | } | |
690 | ||
691 | /** | |
692 | * amba_find_device - locate an AMBA device given a bus id | |
693 | * @busid: bus id for device (or NULL) | |
694 | * @parent: parent device (or NULL) | |
695 | * @id: peripheral ID (or 0) | |
696 | * @mask: peripheral ID mask (or 0) | |
697 | * | |
698 | * Return the AMBA device corresponding to the supplied parameters. | |
699 | * If no device matches, returns NULL. | |
700 | * | |
701 | * NOTE: When a valid device is found, its refcount is | |
702 | * incremented, and must be decremented before the returned | |
703 | * reference. | |
704 | */ | |
705 | struct amba_device * | |
706 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
707 | unsigned int mask) | |
708 | { | |
709 | struct find_data data; | |
710 | ||
711 | data.dev = NULL; | |
712 | data.parent = parent; | |
713 | data.busid = busid; | |
714 | data.id = id; | |
715 | data.mask = mask; | |
716 | ||
717 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
718 | ||
719 | return data.dev; | |
720 | } | |
721 | ||
722 | /** | |
723 | * amba_request_regions - request all mem regions associated with device | |
724 | * @dev: amba_device structure for device | |
725 | * @name: name, or NULL to use driver name | |
726 | */ | |
727 | int amba_request_regions(struct amba_device *dev, const char *name) | |
728 | { | |
729 | int ret = 0; | |
8afe0b96 | 730 | u32 size; |
1da177e4 LT |
731 | |
732 | if (!name) | |
733 | name = dev->dev.driver->name; | |
734 | ||
8afe0b96 LC |
735 | size = resource_size(&dev->res); |
736 | ||
737 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
738 | ret = -EBUSY; |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
743 | /** | |
25985edc | 744 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
745 | * @dev: amba_device structure for device |
746 | * | |
747 | * Release regions claimed by a successful call to amba_request_regions. | |
748 | */ | |
749 | void amba_release_regions(struct amba_device *dev) | |
750 | { | |
8afe0b96 LC |
751 | u32 size; |
752 | ||
753 | size = resource_size(&dev->res); | |
754 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
755 | } |
756 | ||
757 | EXPORT_SYMBOL(amba_driver_register); | |
758 | EXPORT_SYMBOL(amba_driver_unregister); | |
759 | EXPORT_SYMBOL(amba_device_register); | |
760 | EXPORT_SYMBOL(amba_device_unregister); | |
761 | EXPORT_SYMBOL(amba_find_device); | |
762 | EXPORT_SYMBOL(amba_request_regions); | |
763 | EXPORT_SYMBOL(amba_release_regions); |