]>
Commit | Line | Data |
---|---|---|
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 | } | |
108 | ||
96b13f5c RK |
109 | #define amba_attr_func(name,fmt,arg...) \ |
110 | static 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...) \ | |
118 | amba_attr_func(name,fmt,arg) \ | |
119 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
120 | ||
121 | amba_attr_func(id, "%08x\n", dev->periphid); | |
122 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
123 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
124 | amba_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 | ||
128 | static struct device_attribute amba_dev_attrs[] = { | |
129 | __ATTR_RO(id), | |
130 | __ATTR_RO(resource), | |
3cf38571 | 131 | __ATTR_RW(driver_override), |
96b13f5c RK |
132 | __ATTR_NULL, |
133 | }; | |
134 | ||
f210c53a | 135 | #ifdef CONFIG_PM |
92b97f0a RK |
136 | /* |
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 | |
1e45860f | 139 | * does not result in loss of context. |
92b97f0a RK |
140 | */ |
141 | static 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 | ||
5670c2a5 KK |
146 | 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 | } | |
92b97f0a RK |
152 | |
153 | return ret; | |
154 | } | |
155 | ||
156 | static 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) { | |
5670c2a5 KK |
162 | if (pm_runtime_is_irq_safe(dev)) |
163 | ret = clk_enable(pcdev->pclk); | |
164 | else | |
165 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
166 | /* Failure is probably fatal to the system, but... */ |
167 | if (ret) | |
168 | return ret; | |
169 | } | |
170 | ||
171 | return pm_generic_runtime_resume(dev); | |
172 | } | |
5670c2a5 | 173 | #endif /* CONFIG_PM */ |
92b97f0a | 174 | |
ba74ec7f | 175 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
176 | .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, | |
6ed23b80 | 182 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
183 | amba_pm_runtime_suspend, |
184 | amba_pm_runtime_resume, | |
45f0a85c | 185 | NULL |
ba74ec7f RV |
186 | ) |
187 | }; | |
188 | ||
1da177e4 LT |
189 | /* |
190 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
191 | * so we call the bus "amba". | |
192 | */ | |
394d5aef | 193 | struct bus_type amba_bustype = { |
1da177e4 | 194 | .name = "amba", |
96b13f5c | 195 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 196 | .match = amba_match, |
6d20b035 | 197 | .uevent = amba_uevent, |
26825cfd | 198 | .pm = &amba_pm, |
1da177e4 LT |
199 | }; |
200 | ||
201 | static int __init amba_init(void) | |
202 | { | |
203 | return bus_register(&amba_bustype); | |
204 | } | |
205 | ||
206 | postcore_initcall(amba_init); | |
207 | ||
7cfe2494 RK |
208 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
209 | { | |
7cfe2494 RK |
210 | int ret; |
211 | ||
89a5c985 UH |
212 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
213 | if (IS_ERR(pcdev->pclk)) | |
214 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 215 | |
89a5c985 UH |
216 | ret = clk_prepare_enable(pcdev->pclk); |
217 | if (ret) | |
218 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
219 | |
220 | return ret; | |
221 | } | |
222 | ||
223 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
224 | { | |
89a5c985 UH |
225 | clk_disable_unprepare(pcdev->pclk); |
226 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
227 | } |
228 | ||
1da177e4 LT |
229 | /* |
230 | * These are the device model conversion veneers; they convert the | |
231 | * device model structures to our more specific structures. | |
232 | */ | |
233 | static 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); | |
c862aab0 | 237 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 238 | int ret; |
1da177e4 | 239 | |
7cfe2494 | 240 | do { |
bcd3006f SB |
241 | ret = of_clk_set_defaults(dev->of_node, false); |
242 | if (ret < 0) | |
243 | break; | |
244 | ||
207f1a2d UH |
245 | ret = dev_pm_domain_attach(dev, true); |
246 | if (ret == -EPROBE_DEFER) | |
247 | break; | |
248 | ||
7cfe2494 | 249 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
250 | if (ret) { |
251 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 252 | break; |
207f1a2d | 253 | } |
7cfe2494 | 254 | |
92b97f0a RK |
255 | pm_runtime_get_noresume(dev); |
256 | pm_runtime_set_active(dev); | |
257 | pm_runtime_enable(dev); | |
258 | ||
7cfe2494 RK |
259 | ret = pcdrv->probe(pcdev, id); |
260 | if (ret == 0) | |
261 | break; | |
1da177e4 | 262 | |
92b97f0a RK |
263 | pm_runtime_disable(dev); |
264 | pm_runtime_set_suspended(dev); | |
265 | pm_runtime_put_noidle(dev); | |
266 | ||
7cfe2494 | 267 | amba_put_disable_pclk(pcdev); |
207f1a2d | 268 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
269 | } while (0); |
270 | ||
271 | return ret; | |
1da177e4 LT |
272 | } |
273 | ||
274 | static int amba_remove(struct device *dev) | |
275 | { | |
7cfe2494 | 276 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 277 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
278 | 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); | |
7cfe2494 RK |
288 | |
289 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 290 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
291 | |
292 | return ret; | |
1da177e4 LT |
293 | } |
294 | ||
295 | static 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 | */ | |
309 | int 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 | */ | |
329 | void amba_driver_unregister(struct amba_driver *drv) | |
330 | { | |
331 | driver_unregister(&drv->drv); | |
332 | } | |
333 | ||
334 | ||
335 | static 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 | ||
a41980f2 | 344 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 345 | { |
8afe0b96 | 346 | u32 size; |
1da177e4 LT |
347 | void __iomem *tmp; |
348 | int i, ret; | |
349 | ||
2eac58d5 RK |
350 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
351 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
352 | ||
1da177e4 | 353 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
354 | if (ret) |
355 | goto err_out; | |
356 | ||
97ceed1f LW |
357 | /* Hard-coded primecell ID instead of plug-n-play */ |
358 | if (dev->periphid != 0) | |
359 | goto skip_probe; | |
360 | ||
8afe0b96 LC |
361 | /* |
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); | |
96b13f5c RK |
367 | if (!tmp) { |
368 | ret = -ENOMEM; | |
369 | goto err_release; | |
1da177e4 | 370 | } |
96b13f5c | 371 | |
a41980f2 MS |
372 | ret = dev_pm_domain_attach(&dev->dev, true); |
373 | if (ret == -EPROBE_DEFER) { | |
374 | iounmap(tmp); | |
375 | goto err_release; | |
376 | } | |
377 | ||
7cfe2494 RK |
378 | ret = amba_get_enable_pclk(dev); |
379 | if (ret == 0) { | |
380 | u32 pid, cid; | |
96b13f5c | 381 | |
7cfe2494 RK |
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); | |
96b13f5c | 392 | |
7cfe2494 | 393 | amba_put_disable_pclk(dev); |
96b13f5c | 394 | |
a06ae860 | 395 | if (cid == AMBA_CID || cid == CORESIGHT_CID) |
7cfe2494 RK |
396 | dev->periphid = pid; |
397 | ||
398 | if (!dev->periphid) | |
399 | ret = -ENODEV; | |
96b13f5c RK |
400 | } |
401 | ||
7cfe2494 | 402 | iounmap(tmp); |
a41980f2 | 403 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
404 | |
405 | if (ret) | |
406 | goto err_release; | |
407 | ||
97ceed1f | 408 | skip_probe: |
557dca5f | 409 | ret = device_add(&dev->dev); |
96b13f5c RK |
410 | if (ret) |
411 | goto err_release; | |
412 | ||
dfb85185 | 413 | if (dev->irq[0]) |
96b13f5c | 414 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 415 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
416 | 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: | |
1da177e4 LT |
425 | return ret; |
426 | } | |
a41980f2 MS |
427 | |
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 | */ | |
437 | struct deferred_device { | |
438 | struct amba_device *dev; | |
439 | struct resource *parent; | |
440 | struct list_head node; | |
441 | }; | |
442 | ||
443 | static LIST_HEAD(deferred_devices); | |
444 | static DEFINE_MUTEX(deferred_devices_lock); | |
445 | ||
446 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
447 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
448 | ||
449 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
450 | ||
451 | static 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 | */ | |
483 | int 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 | } | |
d5dc9271 RK |
509 | EXPORT_SYMBOL_GPL(amba_device_add); |
510 | ||
6026aa90 LW |
511 | static struct amba_device * |
512 | amba_aphb_device_add(struct device *parent, const char *name, | |
513 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
514 | void *pdata, unsigned int periphid, u64 dma_mask, |
515 | struct resource *resbase) | |
6026aa90 LW |
516 | { |
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 | ||
6026aa90 LW |
524 | 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 | ||
3ad909bc | 531 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
532 | if (ret) { |
533 | amba_device_put(dev); | |
534 | return ERR_PTR(ret); | |
535 | } | |
536 | ||
537 | return dev; | |
538 | } | |
539 | ||
540 | struct amba_device * | |
541 | amba_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, | |
3ad909bc | 546 | periphid, 0, &iomem_resource); |
6026aa90 LW |
547 | } |
548 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
549 | ||
550 | struct amba_device * | |
551 | amba_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, | |
3ad909bc | 556 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
557 | } |
558 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
559 | ||
3ad909bc LW |
560 | struct amba_device * |
561 | amba_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 | } | |
569 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
570 | ||
571 | struct amba_device * | |
572 | amba_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 | } | |
580 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
581 | ||
582 | ||
d5dc9271 RK |
583 | static 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; | |
446b2a93 | 590 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
591 | 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 | */ | |
603 | struct 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 | } | |
618 | EXPORT_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 | */ | |
629 | int 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 | ||
d5dc9271 RK |
634 | return amba_device_add(dev, parent); |
635 | } | |
636 | ||
637 | /** | |
638 | * amba_device_put - put an AMBA device | |
639 | * @dev: AMBA device to put | |
640 | */ | |
641 | void amba_device_put(struct amba_device *dev) | |
642 | { | |
643 | put_device(&dev->dev); | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
646 | |
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 | */ | |
658 | void amba_device_unregister(struct amba_device *dev) | |
659 | { | |
660 | device_unregister(&dev->dev); | |
661 | } | |
662 | ||
663 | ||
664 | struct 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 | ||
672 | static 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) | |
9d6b4c82 | 682 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
683 | |
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 | */ | |
706 | struct amba_device * | |
707 | amba_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 | */ | |
728 | int amba_request_regions(struct amba_device *dev, const char *name) | |
729 | { | |
730 | int ret = 0; | |
8afe0b96 | 731 | u32 size; |
1da177e4 LT |
732 | |
733 | if (!name) | |
734 | name = dev->dev.driver->name; | |
735 | ||
8afe0b96 LC |
736 | size = resource_size(&dev->res); |
737 | ||
738 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
739 | ret = -EBUSY; |
740 | ||
741 | return ret; | |
742 | } | |
743 | ||
744 | /** | |
25985edc | 745 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
746 | * @dev: amba_device structure for device |
747 | * | |
748 | * Release regions claimed by a successful call to amba_request_regions. | |
749 | */ | |
750 | void amba_release_regions(struct amba_device *dev) | |
751 | { | |
8afe0b96 LC |
752 | u32 size; |
753 | ||
754 | size = resource_size(&dev->res); | |
755 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
756 | } |
757 | ||
758 | EXPORT_SYMBOL(amba_driver_register); | |
759 | EXPORT_SYMBOL(amba_driver_unregister); | |
760 | EXPORT_SYMBOL(amba_device_register); | |
761 | EXPORT_SYMBOL(amba_device_unregister); | |
762 | EXPORT_SYMBOL(amba_find_device); | |
763 | EXPORT_SYMBOL(amba_request_regions); | |
764 | EXPORT_SYMBOL(amba_release_regions); |