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> |
1da177e4 | 21 | |
934848da | 22 | #include <asm/irq.h> |
1da177e4 | 23 | |
1da177e4 LT |
24 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
25 | ||
c862aab0 RK |
26 | static const struct amba_id * |
27 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
28 | { |
29 | int ret = 0; | |
30 | ||
31 | while (table->mask) { | |
32 | ret = (dev->periphid & table->mask) == table->id; | |
33 | if (ret) | |
34 | break; | |
35 | table++; | |
36 | } | |
37 | ||
38 | return ret ? table : NULL; | |
39 | } | |
40 | ||
41 | static int amba_match(struct device *dev, struct device_driver *drv) | |
42 | { | |
43 | struct amba_device *pcdev = to_amba_device(dev); | |
44 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
45 | ||
46 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
47 | } | |
48 | ||
7eff2e7a | 49 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
50 | { |
51 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 52 | int retval = 0; |
1da177e4 | 53 | |
7eff2e7a | 54 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
55 | if (retval) |
56 | return retval; | |
57 | ||
58 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 59 | return retval; |
1da177e4 | 60 | } |
1da177e4 | 61 | |
96b13f5c RK |
62 | #define amba_attr_func(name,fmt,arg...) \ |
63 | static ssize_t name##_show(struct device *_dev, \ | |
64 | struct device_attribute *attr, char *buf) \ | |
65 | { \ | |
66 | struct amba_device *dev = to_amba_device(_dev); \ | |
67 | return sprintf(buf, fmt, arg); \ | |
68 | } | |
69 | ||
70 | #define amba_attr(name,fmt,arg...) \ | |
71 | amba_attr_func(name,fmt,arg) \ | |
72 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
73 | ||
74 | amba_attr_func(id, "%08x\n", dev->periphid); | |
75 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
76 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
77 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
78 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
79 | dev->res.flags); | |
80 | ||
81 | static struct device_attribute amba_dev_attrs[] = { | |
82 | __ATTR_RO(id), | |
83 | __ATTR_RO(resource), | |
84 | __ATTR_NULL, | |
85 | }; | |
86 | ||
f210c53a | 87 | #ifdef CONFIG_PM |
92b97f0a RK |
88 | /* |
89 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
90 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 91 | * does not result in loss of context. |
92b97f0a RK |
92 | */ |
93 | static int amba_pm_runtime_suspend(struct device *dev) | |
94 | { | |
95 | struct amba_device *pcdev = to_amba_device(dev); | |
96 | int ret = pm_generic_runtime_suspend(dev); | |
97 | ||
5670c2a5 KK |
98 | if (ret == 0 && dev->driver) { |
99 | if (pm_runtime_is_irq_safe(dev)) | |
100 | clk_disable(pcdev->pclk); | |
101 | else | |
102 | clk_disable_unprepare(pcdev->pclk); | |
103 | } | |
92b97f0a RK |
104 | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static int amba_pm_runtime_resume(struct device *dev) | |
109 | { | |
110 | struct amba_device *pcdev = to_amba_device(dev); | |
111 | int ret; | |
112 | ||
113 | if (dev->driver) { | |
5670c2a5 KK |
114 | if (pm_runtime_is_irq_safe(dev)) |
115 | ret = clk_enable(pcdev->pclk); | |
116 | else | |
117 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
118 | /* Failure is probably fatal to the system, but... */ |
119 | if (ret) | |
120 | return ret; | |
121 | } | |
122 | ||
123 | return pm_generic_runtime_resume(dev); | |
124 | } | |
5670c2a5 | 125 | #endif /* CONFIG_PM */ |
92b97f0a | 126 | |
ba74ec7f | 127 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
128 | .suspend = pm_generic_suspend, |
129 | .resume = pm_generic_resume, | |
130 | .freeze = pm_generic_freeze, | |
131 | .thaw = pm_generic_thaw, | |
132 | .poweroff = pm_generic_poweroff, | |
133 | .restore = pm_generic_restore, | |
6ed23b80 | 134 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
135 | amba_pm_runtime_suspend, |
136 | amba_pm_runtime_resume, | |
45f0a85c | 137 | NULL |
ba74ec7f RV |
138 | ) |
139 | }; | |
140 | ||
1da177e4 LT |
141 | /* |
142 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
143 | * so we call the bus "amba". | |
144 | */ | |
394d5aef | 145 | struct bus_type amba_bustype = { |
1da177e4 | 146 | .name = "amba", |
96b13f5c | 147 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 148 | .match = amba_match, |
6d20b035 | 149 | .uevent = amba_uevent, |
26825cfd | 150 | .pm = &amba_pm, |
1da177e4 LT |
151 | }; |
152 | ||
153 | static int __init amba_init(void) | |
154 | { | |
155 | return bus_register(&amba_bustype); | |
156 | } | |
157 | ||
158 | postcore_initcall(amba_init); | |
159 | ||
7cfe2494 RK |
160 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
161 | { | |
7cfe2494 RK |
162 | int ret; |
163 | ||
89a5c985 UH |
164 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
165 | if (IS_ERR(pcdev->pclk)) | |
166 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 167 | |
89a5c985 UH |
168 | ret = clk_prepare_enable(pcdev->pclk); |
169 | if (ret) | |
170 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
171 | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
176 | { | |
89a5c985 UH |
177 | clk_disable_unprepare(pcdev->pclk); |
178 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
179 | } |
180 | ||
1da177e4 LT |
181 | /* |
182 | * These are the device model conversion veneers; they convert the | |
183 | * device model structures to our more specific structures. | |
184 | */ | |
185 | static int amba_probe(struct device *dev) | |
186 | { | |
187 | struct amba_device *pcdev = to_amba_device(dev); | |
188 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 189 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 190 | int ret; |
1da177e4 | 191 | |
7cfe2494 | 192 | do { |
207f1a2d UH |
193 | ret = dev_pm_domain_attach(dev, true); |
194 | if (ret == -EPROBE_DEFER) | |
195 | break; | |
196 | ||
7cfe2494 | 197 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
198 | if (ret) { |
199 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 200 | break; |
207f1a2d | 201 | } |
7cfe2494 | 202 | |
92b97f0a RK |
203 | pm_runtime_get_noresume(dev); |
204 | pm_runtime_set_active(dev); | |
205 | pm_runtime_enable(dev); | |
206 | ||
7cfe2494 RK |
207 | ret = pcdrv->probe(pcdev, id); |
208 | if (ret == 0) | |
209 | break; | |
1da177e4 | 210 | |
92b97f0a RK |
211 | pm_runtime_disable(dev); |
212 | pm_runtime_set_suspended(dev); | |
213 | pm_runtime_put_noidle(dev); | |
214 | ||
7cfe2494 | 215 | amba_put_disable_pclk(pcdev); |
207f1a2d | 216 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
217 | } while (0); |
218 | ||
219 | return ret; | |
1da177e4 LT |
220 | } |
221 | ||
222 | static int amba_remove(struct device *dev) | |
223 | { | |
7cfe2494 | 224 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 225 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
226 | int ret; |
227 | ||
228 | pm_runtime_get_sync(dev); | |
229 | ret = drv->remove(pcdev); | |
230 | pm_runtime_put_noidle(dev); | |
231 | ||
232 | /* Undo the runtime PM settings in amba_probe() */ | |
233 | pm_runtime_disable(dev); | |
234 | pm_runtime_set_suspended(dev); | |
235 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
236 | |
237 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 238 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
239 | |
240 | return ret; | |
1da177e4 LT |
241 | } |
242 | ||
243 | static void amba_shutdown(struct device *dev) | |
244 | { | |
245 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
246 | drv->shutdown(to_amba_device(dev)); | |
247 | } | |
248 | ||
249 | /** | |
250 | * amba_driver_register - register an AMBA device driver | |
251 | * @drv: amba device driver structure | |
252 | * | |
253 | * Register an AMBA device driver with the Linux device model | |
254 | * core. If devices pre-exist, the drivers probe function will | |
255 | * be called. | |
256 | */ | |
257 | int amba_driver_register(struct amba_driver *drv) | |
258 | { | |
259 | drv->drv.bus = &amba_bustype; | |
260 | ||
261 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
262 | SETFN(probe); | |
263 | SETFN(remove); | |
264 | SETFN(shutdown); | |
265 | ||
266 | return driver_register(&drv->drv); | |
267 | } | |
268 | ||
269 | /** | |
270 | * amba_driver_unregister - remove an AMBA device driver | |
271 | * @drv: AMBA device driver structure to remove | |
272 | * | |
273 | * Unregister an AMBA device driver from the Linux device | |
274 | * model. The device model will call the drivers remove function | |
275 | * for each device the device driver is currently handling. | |
276 | */ | |
277 | void amba_driver_unregister(struct amba_driver *drv) | |
278 | { | |
279 | driver_unregister(&drv->drv); | |
280 | } | |
281 | ||
282 | ||
283 | static void amba_device_release(struct device *dev) | |
284 | { | |
285 | struct amba_device *d = to_amba_device(dev); | |
286 | ||
287 | if (d->res.parent) | |
288 | release_resource(&d->res); | |
289 | kfree(d); | |
290 | } | |
291 | ||
1da177e4 | 292 | /** |
d5dc9271 RK |
293 | * amba_device_add - add a previously allocated AMBA device structure |
294 | * @dev: AMBA device allocated by amba_device_alloc | |
295 | * @parent: resource parent for this devices resources | |
1da177e4 | 296 | * |
d5dc9271 RK |
297 | * Claim the resource, and read the device cell ID if not already |
298 | * initialized. Register the AMBA device with the Linux device | |
299 | * manager. | |
1da177e4 | 300 | */ |
d5dc9271 | 301 | int amba_device_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 302 | { |
8afe0b96 | 303 | u32 size; |
1da177e4 LT |
304 | void __iomem *tmp; |
305 | int i, ret; | |
306 | ||
2eac58d5 RK |
307 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
308 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
309 | ||
1da177e4 | 310 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
311 | if (ret) |
312 | goto err_out; | |
313 | ||
97ceed1f LW |
314 | /* Hard-coded primecell ID instead of plug-n-play */ |
315 | if (dev->periphid != 0) | |
316 | goto skip_probe; | |
317 | ||
8afe0b96 LC |
318 | /* |
319 | * Dynamically calculate the size of the resource | |
320 | * and use this for iomap | |
321 | */ | |
322 | size = resource_size(&dev->res); | |
323 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
324 | if (!tmp) { |
325 | ret = -ENOMEM; | |
326 | goto err_release; | |
1da177e4 | 327 | } |
96b13f5c | 328 | |
7cfe2494 RK |
329 | ret = amba_get_enable_pclk(dev); |
330 | if (ret == 0) { | |
331 | u32 pid, cid; | |
96b13f5c | 332 | |
7cfe2494 RK |
333 | /* |
334 | * Read pid and cid based on size of resource | |
335 | * they are located at end of region | |
336 | */ | |
337 | for (pid = 0, i = 0; i < 4; i++) | |
338 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
339 | (i * 8); | |
340 | for (cid = 0, i = 0; i < 4; i++) | |
341 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
342 | (i * 8); | |
96b13f5c | 343 | |
7cfe2494 | 344 | amba_put_disable_pclk(dev); |
96b13f5c | 345 | |
a06ae860 | 346 | if (cid == AMBA_CID || cid == CORESIGHT_CID) |
7cfe2494 RK |
347 | dev->periphid = pid; |
348 | ||
349 | if (!dev->periphid) | |
350 | ret = -ENODEV; | |
96b13f5c RK |
351 | } |
352 | ||
7cfe2494 RK |
353 | iounmap(tmp); |
354 | ||
355 | if (ret) | |
356 | goto err_release; | |
357 | ||
97ceed1f | 358 | skip_probe: |
557dca5f | 359 | ret = device_add(&dev->dev); |
96b13f5c RK |
360 | if (ret) |
361 | goto err_release; | |
362 | ||
dfb85185 | 363 | if (dev->irq[0]) |
96b13f5c | 364 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 365 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
366 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
367 | if (ret == 0) | |
368 | return ret; | |
369 | ||
370 | device_unregister(&dev->dev); | |
371 | ||
372 | err_release: | |
373 | release_resource(&dev->res); | |
374 | err_out: | |
1da177e4 LT |
375 | return ret; |
376 | } | |
d5dc9271 RK |
377 | EXPORT_SYMBOL_GPL(amba_device_add); |
378 | ||
6026aa90 LW |
379 | static struct amba_device * |
380 | amba_aphb_device_add(struct device *parent, const char *name, | |
381 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
382 | void *pdata, unsigned int periphid, u64 dma_mask, |
383 | struct resource *resbase) | |
6026aa90 LW |
384 | { |
385 | struct amba_device *dev; | |
386 | int ret; | |
387 | ||
388 | dev = amba_device_alloc(name, base, size); | |
389 | if (!dev) | |
390 | return ERR_PTR(-ENOMEM); | |
391 | ||
6026aa90 LW |
392 | dev->dev.coherent_dma_mask = dma_mask; |
393 | dev->irq[0] = irq1; | |
394 | dev->irq[1] = irq2; | |
395 | dev->periphid = periphid; | |
396 | dev->dev.platform_data = pdata; | |
397 | dev->dev.parent = parent; | |
398 | ||
3ad909bc | 399 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
400 | if (ret) { |
401 | amba_device_put(dev); | |
402 | return ERR_PTR(ret); | |
403 | } | |
404 | ||
405 | return dev; | |
406 | } | |
407 | ||
408 | struct amba_device * | |
409 | amba_apb_device_add(struct device *parent, const char *name, | |
410 | resource_size_t base, size_t size, int irq1, int irq2, | |
411 | void *pdata, unsigned int periphid) | |
412 | { | |
413 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 414 | periphid, 0, &iomem_resource); |
6026aa90 LW |
415 | } |
416 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
417 | ||
418 | struct amba_device * | |
419 | amba_ahb_device_add(struct device *parent, const char *name, | |
420 | resource_size_t base, size_t size, int irq1, int irq2, | |
421 | void *pdata, unsigned int periphid) | |
422 | { | |
423 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 424 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
425 | } |
426 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
427 | ||
3ad909bc LW |
428 | struct amba_device * |
429 | amba_apb_device_add_res(struct device *parent, const char *name, | |
430 | resource_size_t base, size_t size, int irq1, | |
431 | int irq2, void *pdata, unsigned int periphid, | |
432 | struct resource *resbase) | |
433 | { | |
434 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
435 | periphid, 0, resbase); | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
438 | ||
439 | struct amba_device * | |
440 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
441 | resource_size_t base, size_t size, int irq1, | |
442 | int irq2, void *pdata, unsigned int periphid, | |
443 | struct resource *resbase) | |
444 | { | |
445 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
446 | periphid, ~0ULL, resbase); | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
449 | ||
450 | ||
d5dc9271 RK |
451 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
452 | { | |
453 | device_initialize(&dev->dev); | |
454 | if (name) | |
455 | dev_set_name(&dev->dev, "%s", name); | |
456 | dev->dev.release = amba_device_release; | |
457 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 458 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
459 | dev->res.name = dev_name(&dev->dev); |
460 | } | |
461 | ||
462 | /** | |
463 | * amba_device_alloc - allocate an AMBA device | |
464 | * @name: sysfs name of the AMBA device | |
465 | * @base: base of AMBA device | |
466 | * @size: size of AMBA device | |
467 | * | |
468 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
469 | * on failure. | |
470 | */ | |
471 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
472 | size_t size) | |
473 | { | |
474 | struct amba_device *dev; | |
475 | ||
476 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
477 | if (dev) { | |
478 | amba_device_initialize(dev, name); | |
479 | dev->res.start = base; | |
480 | dev->res.end = base + size - 1; | |
481 | dev->res.flags = IORESOURCE_MEM; | |
482 | } | |
483 | ||
484 | return dev; | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
487 | ||
488 | /** | |
489 | * amba_device_register - register an AMBA device | |
490 | * @dev: AMBA device to register | |
491 | * @parent: parent memory resource | |
492 | * | |
493 | * Setup the AMBA device, reading the cell ID if present. | |
494 | * Claim the resource, and register the AMBA device with | |
495 | * the Linux device manager. | |
496 | */ | |
497 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
498 | { | |
499 | amba_device_initialize(dev, dev->dev.init_name); | |
500 | dev->dev.init_name = NULL; | |
501 | ||
d5dc9271 RK |
502 | return amba_device_add(dev, parent); |
503 | } | |
504 | ||
505 | /** | |
506 | * amba_device_put - put an AMBA device | |
507 | * @dev: AMBA device to put | |
508 | */ | |
509 | void amba_device_put(struct amba_device *dev) | |
510 | { | |
511 | put_device(&dev->dev); | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
514 | |
515 | /** | |
516 | * amba_device_unregister - unregister an AMBA device | |
517 | * @dev: AMBA device to remove | |
518 | * | |
519 | * Remove the specified AMBA device from the Linux device | |
520 | * manager. All files associated with this object will be | |
521 | * destroyed, and device drivers notified that the device has | |
522 | * been removed. The AMBA device's resources including | |
523 | * the amba_device structure will be freed once all | |
524 | * references to it have been dropped. | |
525 | */ | |
526 | void amba_device_unregister(struct amba_device *dev) | |
527 | { | |
528 | device_unregister(&dev->dev); | |
529 | } | |
530 | ||
531 | ||
532 | struct find_data { | |
533 | struct amba_device *dev; | |
534 | struct device *parent; | |
535 | const char *busid; | |
536 | unsigned int id; | |
537 | unsigned int mask; | |
538 | }; | |
539 | ||
540 | static int amba_find_match(struct device *dev, void *data) | |
541 | { | |
542 | struct find_data *d = data; | |
543 | struct amba_device *pcdev = to_amba_device(dev); | |
544 | int r; | |
545 | ||
546 | r = (pcdev->periphid & d->mask) == d->id; | |
547 | if (d->parent) | |
548 | r &= d->parent == dev->parent; | |
549 | if (d->busid) | |
9d6b4c82 | 550 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
551 | |
552 | if (r) { | |
553 | get_device(dev); | |
554 | d->dev = pcdev; | |
555 | } | |
556 | ||
557 | return r; | |
558 | } | |
559 | ||
560 | /** | |
561 | * amba_find_device - locate an AMBA device given a bus id | |
562 | * @busid: bus id for device (or NULL) | |
563 | * @parent: parent device (or NULL) | |
564 | * @id: peripheral ID (or 0) | |
565 | * @mask: peripheral ID mask (or 0) | |
566 | * | |
567 | * Return the AMBA device corresponding to the supplied parameters. | |
568 | * If no device matches, returns NULL. | |
569 | * | |
570 | * NOTE: When a valid device is found, its refcount is | |
571 | * incremented, and must be decremented before the returned | |
572 | * reference. | |
573 | */ | |
574 | struct amba_device * | |
575 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
576 | unsigned int mask) | |
577 | { | |
578 | struct find_data data; | |
579 | ||
580 | data.dev = NULL; | |
581 | data.parent = parent; | |
582 | data.busid = busid; | |
583 | data.id = id; | |
584 | data.mask = mask; | |
585 | ||
586 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
587 | ||
588 | return data.dev; | |
589 | } | |
590 | ||
591 | /** | |
592 | * amba_request_regions - request all mem regions associated with device | |
593 | * @dev: amba_device structure for device | |
594 | * @name: name, or NULL to use driver name | |
595 | */ | |
596 | int amba_request_regions(struct amba_device *dev, const char *name) | |
597 | { | |
598 | int ret = 0; | |
8afe0b96 | 599 | u32 size; |
1da177e4 LT |
600 | |
601 | if (!name) | |
602 | name = dev->dev.driver->name; | |
603 | ||
8afe0b96 LC |
604 | size = resource_size(&dev->res); |
605 | ||
606 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
607 | ret = -EBUSY; |
608 | ||
609 | return ret; | |
610 | } | |
611 | ||
612 | /** | |
25985edc | 613 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
614 | * @dev: amba_device structure for device |
615 | * | |
616 | * Release regions claimed by a successful call to amba_request_regions. | |
617 | */ | |
618 | void amba_release_regions(struct amba_device *dev) | |
619 | { | |
8afe0b96 LC |
620 | u32 size; |
621 | ||
622 | size = resource_size(&dev->res); | |
623 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
624 | } |
625 | ||
626 | EXPORT_SYMBOL(amba_driver_register); | |
627 | EXPORT_SYMBOL(amba_driver_unregister); | |
628 | EXPORT_SYMBOL(amba_device_register); | |
629 | EXPORT_SYMBOL(amba_device_unregister); | |
630 | EXPORT_SYMBOL(amba_find_device); | |
631 | EXPORT_SYMBOL(amba_request_regions); | |
632 | EXPORT_SYMBOL(amba_release_regions); |