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> |
1da177e4 | 22 | |
934848da | 23 | #include <asm/irq.h> |
1da177e4 | 24 | |
1da177e4 LT |
25 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
26 | ||
c862aab0 RK |
27 | static const struct amba_id * |
28 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
29 | { |
30 | int ret = 0; | |
31 | ||
32 | while (table->mask) { | |
33 | ret = (dev->periphid & table->mask) == table->id; | |
34 | if (ret) | |
35 | break; | |
36 | table++; | |
37 | } | |
38 | ||
39 | return ret ? table : NULL; | |
40 | } | |
41 | ||
42 | static int amba_match(struct device *dev, struct device_driver *drv) | |
43 | { | |
44 | struct amba_device *pcdev = to_amba_device(dev); | |
45 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
46 | ||
3cf38571 AM |
47 | /* When driver_override is set, only bind to the matching driver */ |
48 | if (pcdev->driver_override) | |
49 | return !strcmp(pcdev->driver_override, drv->name); | |
50 | ||
1da177e4 LT |
51 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; |
52 | } | |
53 | ||
7eff2e7a | 54 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
55 | { |
56 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 57 | int retval = 0; |
1da177e4 | 58 | |
7eff2e7a | 59 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
60 | if (retval) |
61 | return retval; | |
62 | ||
63 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 64 | return retval; |
1da177e4 | 65 | } |
1da177e4 | 66 | |
3cf38571 AM |
67 | static ssize_t driver_override_show(struct device *_dev, |
68 | struct device_attribute *attr, char *buf) | |
69 | { | |
70 | struct amba_device *dev = to_amba_device(_dev); | |
71 | ||
72 | if (!dev->driver_override) | |
73 | return 0; | |
74 | ||
75 | return sprintf(buf, "%s\n", dev->driver_override); | |
76 | } | |
77 | ||
78 | static ssize_t driver_override_store(struct device *_dev, | |
79 | struct device_attribute *attr, | |
80 | const char *buf, size_t count) | |
81 | { | |
82 | struct amba_device *dev = to_amba_device(_dev); | |
83 | char *driver_override, *old = dev->driver_override, *cp; | |
84 | ||
85 | if (count > PATH_MAX) | |
86 | return -EINVAL; | |
87 | ||
88 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
89 | if (!driver_override) | |
90 | return -ENOMEM; | |
91 | ||
92 | cp = strchr(driver_override, '\n'); | |
93 | if (cp) | |
94 | *cp = '\0'; | |
95 | ||
96 | if (strlen(driver_override)) { | |
97 | dev->driver_override = driver_override; | |
98 | } else { | |
99 | kfree(driver_override); | |
100 | dev->driver_override = NULL; | |
101 | } | |
102 | ||
103 | kfree(old); | |
104 | ||
105 | return count; | |
106 | } | |
107 | ||
96b13f5c RK |
108 | #define amba_attr_func(name,fmt,arg...) \ |
109 | static ssize_t name##_show(struct device *_dev, \ | |
110 | struct device_attribute *attr, char *buf) \ | |
111 | { \ | |
112 | struct amba_device *dev = to_amba_device(_dev); \ | |
113 | return sprintf(buf, fmt, arg); \ | |
114 | } | |
115 | ||
116 | #define amba_attr(name,fmt,arg...) \ | |
117 | amba_attr_func(name,fmt,arg) \ | |
118 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
119 | ||
120 | amba_attr_func(id, "%08x\n", dev->periphid); | |
121 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
122 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
123 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
124 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
125 | dev->res.flags); | |
126 | ||
127 | static struct device_attribute amba_dev_attrs[] = { | |
128 | __ATTR_RO(id), | |
129 | __ATTR_RO(resource), | |
3cf38571 | 130 | __ATTR_RW(driver_override), |
96b13f5c RK |
131 | __ATTR_NULL, |
132 | }; | |
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", |
96b13f5c | 194 | .dev_attrs = amba_dev_attrs, |
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 { |
207f1a2d UH |
240 | ret = dev_pm_domain_attach(dev, true); |
241 | if (ret == -EPROBE_DEFER) | |
242 | break; | |
243 | ||
7cfe2494 | 244 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
245 | if (ret) { |
246 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 247 | break; |
207f1a2d | 248 | } |
7cfe2494 | 249 | |
92b97f0a RK |
250 | pm_runtime_get_noresume(dev); |
251 | pm_runtime_set_active(dev); | |
252 | pm_runtime_enable(dev); | |
253 | ||
7cfe2494 RK |
254 | ret = pcdrv->probe(pcdev, id); |
255 | if (ret == 0) | |
256 | break; | |
1da177e4 | 257 | |
92b97f0a RK |
258 | pm_runtime_disable(dev); |
259 | pm_runtime_set_suspended(dev); | |
260 | pm_runtime_put_noidle(dev); | |
261 | ||
7cfe2494 | 262 | amba_put_disable_pclk(pcdev); |
207f1a2d | 263 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
264 | } while (0); |
265 | ||
266 | return ret; | |
1da177e4 LT |
267 | } |
268 | ||
269 | static int amba_remove(struct device *dev) | |
270 | { | |
7cfe2494 | 271 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 272 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
273 | int ret; |
274 | ||
275 | pm_runtime_get_sync(dev); | |
276 | ret = drv->remove(pcdev); | |
277 | pm_runtime_put_noidle(dev); | |
278 | ||
279 | /* Undo the runtime PM settings in amba_probe() */ | |
280 | pm_runtime_disable(dev); | |
281 | pm_runtime_set_suspended(dev); | |
282 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
283 | |
284 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 285 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
286 | |
287 | return ret; | |
1da177e4 LT |
288 | } |
289 | ||
290 | static void amba_shutdown(struct device *dev) | |
291 | { | |
292 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
293 | drv->shutdown(to_amba_device(dev)); | |
294 | } | |
295 | ||
296 | /** | |
297 | * amba_driver_register - register an AMBA device driver | |
298 | * @drv: amba device driver structure | |
299 | * | |
300 | * Register an AMBA device driver with the Linux device model | |
301 | * core. If devices pre-exist, the drivers probe function will | |
302 | * be called. | |
303 | */ | |
304 | int amba_driver_register(struct amba_driver *drv) | |
305 | { | |
306 | drv->drv.bus = &amba_bustype; | |
307 | ||
308 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
309 | SETFN(probe); | |
310 | SETFN(remove); | |
311 | SETFN(shutdown); | |
312 | ||
313 | return driver_register(&drv->drv); | |
314 | } | |
315 | ||
316 | /** | |
317 | * amba_driver_unregister - remove an AMBA device driver | |
318 | * @drv: AMBA device driver structure to remove | |
319 | * | |
320 | * Unregister an AMBA device driver from the Linux device | |
321 | * model. The device model will call the drivers remove function | |
322 | * for each device the device driver is currently handling. | |
323 | */ | |
324 | void amba_driver_unregister(struct amba_driver *drv) | |
325 | { | |
326 | driver_unregister(&drv->drv); | |
327 | } | |
328 | ||
329 | ||
330 | static void amba_device_release(struct device *dev) | |
331 | { | |
332 | struct amba_device *d = to_amba_device(dev); | |
333 | ||
334 | if (d->res.parent) | |
335 | release_resource(&d->res); | |
336 | kfree(d); | |
337 | } | |
338 | ||
a41980f2 | 339 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 340 | { |
8afe0b96 | 341 | u32 size; |
1da177e4 LT |
342 | void __iomem *tmp; |
343 | int i, ret; | |
344 | ||
2eac58d5 RK |
345 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
346 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
347 | ||
1da177e4 | 348 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
349 | if (ret) |
350 | goto err_out; | |
351 | ||
97ceed1f LW |
352 | /* Hard-coded primecell ID instead of plug-n-play */ |
353 | if (dev->periphid != 0) | |
354 | goto skip_probe; | |
355 | ||
8afe0b96 LC |
356 | /* |
357 | * Dynamically calculate the size of the resource | |
358 | * and use this for iomap | |
359 | */ | |
360 | size = resource_size(&dev->res); | |
361 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
362 | if (!tmp) { |
363 | ret = -ENOMEM; | |
364 | goto err_release; | |
1da177e4 | 365 | } |
96b13f5c | 366 | |
a41980f2 MS |
367 | ret = dev_pm_domain_attach(&dev->dev, true); |
368 | if (ret == -EPROBE_DEFER) { | |
369 | iounmap(tmp); | |
370 | goto err_release; | |
371 | } | |
372 | ||
7cfe2494 RK |
373 | ret = amba_get_enable_pclk(dev); |
374 | if (ret == 0) { | |
375 | u32 pid, cid; | |
96b13f5c | 376 | |
7cfe2494 RK |
377 | /* |
378 | * Read pid and cid based on size of resource | |
379 | * they are located at end of region | |
380 | */ | |
381 | for (pid = 0, i = 0; i < 4; i++) | |
382 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
383 | (i * 8); | |
384 | for (cid = 0, i = 0; i < 4; i++) | |
385 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
386 | (i * 8); | |
96b13f5c | 387 | |
7cfe2494 | 388 | amba_put_disable_pclk(dev); |
96b13f5c | 389 | |
a06ae860 | 390 | if (cid == AMBA_CID || cid == CORESIGHT_CID) |
7cfe2494 RK |
391 | dev->periphid = pid; |
392 | ||
393 | if (!dev->periphid) | |
394 | ret = -ENODEV; | |
96b13f5c RK |
395 | } |
396 | ||
7cfe2494 | 397 | iounmap(tmp); |
a41980f2 | 398 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
399 | |
400 | if (ret) | |
401 | goto err_release; | |
402 | ||
97ceed1f | 403 | skip_probe: |
557dca5f | 404 | ret = device_add(&dev->dev); |
96b13f5c RK |
405 | if (ret) |
406 | goto err_release; | |
407 | ||
dfb85185 | 408 | if (dev->irq[0]) |
96b13f5c | 409 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 410 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
411 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
412 | if (ret == 0) | |
413 | return ret; | |
414 | ||
415 | device_unregister(&dev->dev); | |
416 | ||
417 | err_release: | |
418 | release_resource(&dev->res); | |
419 | err_out: | |
1da177e4 LT |
420 | return ret; |
421 | } | |
a41980f2 MS |
422 | |
423 | /* | |
424 | * Registration of AMBA device require reading its pid and cid registers. | |
425 | * To do this, the device must be turned on (if it is a part of power domain) | |
426 | * and have clocks enabled. However in some cases those resources might not be | |
427 | * yet available. Returning EPROBE_DEFER is not a solution in such case, | |
428 | * because callers don't handle this special error code. Instead such devices | |
429 | * are added to the special list and their registration is retried from | |
430 | * periodic worker, until all resources are available and registration succeeds. | |
431 | */ | |
432 | struct deferred_device { | |
433 | struct amba_device *dev; | |
434 | struct resource *parent; | |
435 | struct list_head node; | |
436 | }; | |
437 | ||
438 | static LIST_HEAD(deferred_devices); | |
439 | static DEFINE_MUTEX(deferred_devices_lock); | |
440 | ||
441 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
442 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
443 | ||
444 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
445 | ||
446 | static void amba_deferred_retry_func(struct work_struct *dummy) | |
447 | { | |
448 | struct deferred_device *ddev, *tmp; | |
449 | ||
450 | mutex_lock(&deferred_devices_lock); | |
451 | ||
452 | list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) { | |
453 | int ret = amba_device_try_add(ddev->dev, ddev->parent); | |
454 | ||
455 | if (ret == -EPROBE_DEFER) | |
456 | continue; | |
457 | ||
458 | list_del_init(&ddev->node); | |
459 | kfree(ddev); | |
460 | } | |
461 | ||
462 | if (!list_empty(&deferred_devices)) | |
463 | schedule_delayed_work(&deferred_retry_work, | |
464 | DEFERRED_DEVICE_TIMEOUT); | |
465 | ||
466 | mutex_unlock(&deferred_devices_lock); | |
467 | } | |
468 | ||
469 | /** | |
470 | * amba_device_add - add a previously allocated AMBA device structure | |
471 | * @dev: AMBA device allocated by amba_device_alloc | |
472 | * @parent: resource parent for this devices resources | |
473 | * | |
474 | * Claim the resource, and read the device cell ID if not already | |
475 | * initialized. Register the AMBA device with the Linux device | |
476 | * manager. | |
477 | */ | |
478 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
479 | { | |
480 | int ret = amba_device_try_add(dev, parent); | |
481 | ||
482 | if (ret == -EPROBE_DEFER) { | |
483 | struct deferred_device *ddev; | |
484 | ||
485 | ddev = kmalloc(sizeof(*ddev), GFP_KERNEL); | |
486 | if (!ddev) | |
487 | return -ENOMEM; | |
488 | ||
489 | ddev->dev = dev; | |
490 | ddev->parent = parent; | |
491 | ret = 0; | |
492 | ||
493 | mutex_lock(&deferred_devices_lock); | |
494 | ||
495 | if (list_empty(&deferred_devices)) | |
496 | schedule_delayed_work(&deferred_retry_work, | |
497 | DEFERRED_DEVICE_TIMEOUT); | |
498 | list_add_tail(&ddev->node, &deferred_devices); | |
499 | ||
500 | mutex_unlock(&deferred_devices_lock); | |
501 | } | |
502 | return ret; | |
503 | } | |
d5dc9271 RK |
504 | EXPORT_SYMBOL_GPL(amba_device_add); |
505 | ||
6026aa90 LW |
506 | static struct amba_device * |
507 | amba_aphb_device_add(struct device *parent, const char *name, | |
508 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
509 | void *pdata, unsigned int periphid, u64 dma_mask, |
510 | struct resource *resbase) | |
6026aa90 LW |
511 | { |
512 | struct amba_device *dev; | |
513 | int ret; | |
514 | ||
515 | dev = amba_device_alloc(name, base, size); | |
516 | if (!dev) | |
517 | return ERR_PTR(-ENOMEM); | |
518 | ||
6026aa90 LW |
519 | dev->dev.coherent_dma_mask = dma_mask; |
520 | dev->irq[0] = irq1; | |
521 | dev->irq[1] = irq2; | |
522 | dev->periphid = periphid; | |
523 | dev->dev.platform_data = pdata; | |
524 | dev->dev.parent = parent; | |
525 | ||
3ad909bc | 526 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
527 | if (ret) { |
528 | amba_device_put(dev); | |
529 | return ERR_PTR(ret); | |
530 | } | |
531 | ||
532 | return dev; | |
533 | } | |
534 | ||
535 | struct amba_device * | |
536 | amba_apb_device_add(struct device *parent, const char *name, | |
537 | resource_size_t base, size_t size, int irq1, int irq2, | |
538 | void *pdata, unsigned int periphid) | |
539 | { | |
540 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 541 | periphid, 0, &iomem_resource); |
6026aa90 LW |
542 | } |
543 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
544 | ||
545 | struct amba_device * | |
546 | amba_ahb_device_add(struct device *parent, const char *name, | |
547 | resource_size_t base, size_t size, int irq1, int irq2, | |
548 | void *pdata, unsigned int periphid) | |
549 | { | |
550 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 551 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
552 | } |
553 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
554 | ||
3ad909bc LW |
555 | struct amba_device * |
556 | amba_apb_device_add_res(struct device *parent, const char *name, | |
557 | resource_size_t base, size_t size, int irq1, | |
558 | int irq2, void *pdata, unsigned int periphid, | |
559 | struct resource *resbase) | |
560 | { | |
561 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
562 | periphid, 0, resbase); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
565 | ||
566 | struct amba_device * | |
567 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
568 | resource_size_t base, size_t size, int irq1, | |
569 | int irq2, void *pdata, unsigned int periphid, | |
570 | struct resource *resbase) | |
571 | { | |
572 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
573 | periphid, ~0ULL, resbase); | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
576 | ||
577 | ||
d5dc9271 RK |
578 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
579 | { | |
580 | device_initialize(&dev->dev); | |
581 | if (name) | |
582 | dev_set_name(&dev->dev, "%s", name); | |
583 | dev->dev.release = amba_device_release; | |
584 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 585 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
586 | dev->res.name = dev_name(&dev->dev); |
587 | } | |
588 | ||
589 | /** | |
590 | * amba_device_alloc - allocate an AMBA device | |
591 | * @name: sysfs name of the AMBA device | |
592 | * @base: base of AMBA device | |
593 | * @size: size of AMBA device | |
594 | * | |
595 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
596 | * on failure. | |
597 | */ | |
598 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
599 | size_t size) | |
600 | { | |
601 | struct amba_device *dev; | |
602 | ||
603 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
604 | if (dev) { | |
605 | amba_device_initialize(dev, name); | |
606 | dev->res.start = base; | |
607 | dev->res.end = base + size - 1; | |
608 | dev->res.flags = IORESOURCE_MEM; | |
609 | } | |
610 | ||
611 | return dev; | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
614 | ||
615 | /** | |
616 | * amba_device_register - register an AMBA device | |
617 | * @dev: AMBA device to register | |
618 | * @parent: parent memory resource | |
619 | * | |
620 | * Setup the AMBA device, reading the cell ID if present. | |
621 | * Claim the resource, and register the AMBA device with | |
622 | * the Linux device manager. | |
623 | */ | |
624 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
625 | { | |
626 | amba_device_initialize(dev, dev->dev.init_name); | |
627 | dev->dev.init_name = NULL; | |
628 | ||
d5dc9271 RK |
629 | return amba_device_add(dev, parent); |
630 | } | |
631 | ||
632 | /** | |
633 | * amba_device_put - put an AMBA device | |
634 | * @dev: AMBA device to put | |
635 | */ | |
636 | void amba_device_put(struct amba_device *dev) | |
637 | { | |
638 | put_device(&dev->dev); | |
639 | } | |
640 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
641 | |
642 | /** | |
643 | * amba_device_unregister - unregister an AMBA device | |
644 | * @dev: AMBA device to remove | |
645 | * | |
646 | * Remove the specified AMBA device from the Linux device | |
647 | * manager. All files associated with this object will be | |
648 | * destroyed, and device drivers notified that the device has | |
649 | * been removed. The AMBA device's resources including | |
650 | * the amba_device structure will be freed once all | |
651 | * references to it have been dropped. | |
652 | */ | |
653 | void amba_device_unregister(struct amba_device *dev) | |
654 | { | |
655 | device_unregister(&dev->dev); | |
656 | } | |
657 | ||
658 | ||
659 | struct find_data { | |
660 | struct amba_device *dev; | |
661 | struct device *parent; | |
662 | const char *busid; | |
663 | unsigned int id; | |
664 | unsigned int mask; | |
665 | }; | |
666 | ||
667 | static int amba_find_match(struct device *dev, void *data) | |
668 | { | |
669 | struct find_data *d = data; | |
670 | struct amba_device *pcdev = to_amba_device(dev); | |
671 | int r; | |
672 | ||
673 | r = (pcdev->periphid & d->mask) == d->id; | |
674 | if (d->parent) | |
675 | r &= d->parent == dev->parent; | |
676 | if (d->busid) | |
9d6b4c82 | 677 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
678 | |
679 | if (r) { | |
680 | get_device(dev); | |
681 | d->dev = pcdev; | |
682 | } | |
683 | ||
684 | return r; | |
685 | } | |
686 | ||
687 | /** | |
688 | * amba_find_device - locate an AMBA device given a bus id | |
689 | * @busid: bus id for device (or NULL) | |
690 | * @parent: parent device (or NULL) | |
691 | * @id: peripheral ID (or 0) | |
692 | * @mask: peripheral ID mask (or 0) | |
693 | * | |
694 | * Return the AMBA device corresponding to the supplied parameters. | |
695 | * If no device matches, returns NULL. | |
696 | * | |
697 | * NOTE: When a valid device is found, its refcount is | |
698 | * incremented, and must be decremented before the returned | |
699 | * reference. | |
700 | */ | |
701 | struct amba_device * | |
702 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
703 | unsigned int mask) | |
704 | { | |
705 | struct find_data data; | |
706 | ||
707 | data.dev = NULL; | |
708 | data.parent = parent; | |
709 | data.busid = busid; | |
710 | data.id = id; | |
711 | data.mask = mask; | |
712 | ||
713 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
714 | ||
715 | return data.dev; | |
716 | } | |
717 | ||
718 | /** | |
719 | * amba_request_regions - request all mem regions associated with device | |
720 | * @dev: amba_device structure for device | |
721 | * @name: name, or NULL to use driver name | |
722 | */ | |
723 | int amba_request_regions(struct amba_device *dev, const char *name) | |
724 | { | |
725 | int ret = 0; | |
8afe0b96 | 726 | u32 size; |
1da177e4 LT |
727 | |
728 | if (!name) | |
729 | name = dev->dev.driver->name; | |
730 | ||
8afe0b96 LC |
731 | size = resource_size(&dev->res); |
732 | ||
733 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
734 | ret = -EBUSY; |
735 | ||
736 | return ret; | |
737 | } | |
738 | ||
739 | /** | |
25985edc | 740 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
741 | * @dev: amba_device structure for device |
742 | * | |
743 | * Release regions claimed by a successful call to amba_request_regions. | |
744 | */ | |
745 | void amba_release_regions(struct amba_device *dev) | |
746 | { | |
8afe0b96 LC |
747 | u32 size; |
748 | ||
749 | size = resource_size(&dev->res); | |
750 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
751 | } |
752 | ||
753 | EXPORT_SYMBOL(amba_driver_register); | |
754 | EXPORT_SYMBOL(amba_driver_unregister); | |
755 | EXPORT_SYMBOL(amba_device_register); | |
756 | EXPORT_SYMBOL(amba_device_unregister); | |
757 | EXPORT_SYMBOL(amba_find_device); | |
758 | EXPORT_SYMBOL(amba_request_regions); | |
759 | EXPORT_SYMBOL(amba_release_regions); |