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> | |
a62c80e5 | 18 | #include <linux/amba/bus.h> |
1da177e4 | 19 | |
934848da | 20 | #include <asm/irq.h> |
1da177e4 LT |
21 | #include <asm/sizes.h> |
22 | ||
1da177e4 LT |
23 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
24 | ||
c862aab0 RK |
25 | static const struct amba_id * |
26 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
27 | { |
28 | int ret = 0; | |
29 | ||
30 | while (table->mask) { | |
31 | ret = (dev->periphid & table->mask) == table->id; | |
32 | if (ret) | |
33 | break; | |
34 | table++; | |
35 | } | |
36 | ||
37 | return ret ? table : NULL; | |
38 | } | |
39 | ||
40 | static int amba_match(struct device *dev, struct device_driver *drv) | |
41 | { | |
42 | struct amba_device *pcdev = to_amba_device(dev); | |
43 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
44 | ||
45 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
46 | } | |
47 | ||
48 | #ifdef CONFIG_HOTPLUG | |
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 LT |
60 | } |
61 | #else | |
6d20b035 | 62 | #define amba_uevent NULL |
1da177e4 LT |
63 | #endif |
64 | ||
96b13f5c RK |
65 | #define amba_attr_func(name,fmt,arg...) \ |
66 | static ssize_t name##_show(struct device *_dev, \ | |
67 | struct device_attribute *attr, char *buf) \ | |
68 | { \ | |
69 | struct amba_device *dev = to_amba_device(_dev); \ | |
70 | return sprintf(buf, fmt, arg); \ | |
71 | } | |
72 | ||
73 | #define amba_attr(name,fmt,arg...) \ | |
74 | amba_attr_func(name,fmt,arg) \ | |
75 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
76 | ||
77 | amba_attr_func(id, "%08x\n", dev->periphid); | |
78 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
79 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
80 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
81 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
82 | dev->res.flags); | |
83 | ||
84 | static struct device_attribute amba_dev_attrs[] = { | |
85 | __ATTR_RO(id), | |
86 | __ATTR_RO(resource), | |
87 | __ATTR_NULL, | |
88 | }; | |
89 | ||
ba74ec7f RV |
90 | #ifdef CONFIG_PM_SLEEP |
91 | ||
92 | static int amba_legacy_suspend(struct device *dev, pm_message_t mesg) | |
93 | { | |
94 | struct amba_driver *adrv = to_amba_driver(dev->driver); | |
95 | struct amba_device *adev = to_amba_device(dev); | |
96 | int ret = 0; | |
97 | ||
98 | if (dev->driver && adrv->suspend) | |
99 | ret = adrv->suspend(adev, mesg); | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | static int amba_legacy_resume(struct device *dev) | |
105 | { | |
106 | struct amba_driver *adrv = to_amba_driver(dev->driver); | |
107 | struct amba_device *adev = to_amba_device(dev); | |
108 | int ret = 0; | |
109 | ||
110 | if (dev->driver && adrv->resume) | |
111 | ret = adrv->resume(adev); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
8114ab76 | 116 | #endif /* CONFIG_PM_SLEEP */ |
ba74ec7f RV |
117 | |
118 | #ifdef CONFIG_SUSPEND | |
119 | ||
120 | static int amba_pm_suspend(struct device *dev) | |
121 | { | |
122 | struct device_driver *drv = dev->driver; | |
123 | int ret = 0; | |
124 | ||
125 | if (!drv) | |
126 | return 0; | |
127 | ||
128 | if (drv->pm) { | |
129 | if (drv->pm->suspend) | |
130 | ret = drv->pm->suspend(dev); | |
131 | } else { | |
132 | ret = amba_legacy_suspend(dev, PMSG_SUSPEND); | |
133 | } | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
ba74ec7f RV |
138 | static int amba_pm_resume(struct device *dev) |
139 | { | |
140 | struct device_driver *drv = dev->driver; | |
141 | int ret = 0; | |
142 | ||
143 | if (!drv) | |
144 | return 0; | |
145 | ||
146 | if (drv->pm) { | |
147 | if (drv->pm->resume) | |
148 | ret = drv->pm->resume(dev); | |
149 | } else { | |
150 | ret = amba_legacy_resume(dev); | |
151 | } | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
ba74ec7f RV |
156 | #else /* !CONFIG_SUSPEND */ |
157 | ||
158 | #define amba_pm_suspend NULL | |
159 | #define amba_pm_resume NULL | |
ba74ec7f RV |
160 | |
161 | #endif /* !CONFIG_SUSPEND */ | |
162 | ||
1f112cee | 163 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
ba74ec7f RV |
164 | |
165 | static int amba_pm_freeze(struct device *dev) | |
166 | { | |
167 | struct device_driver *drv = dev->driver; | |
168 | int ret = 0; | |
169 | ||
170 | if (!drv) | |
171 | return 0; | |
172 | ||
173 | if (drv->pm) { | |
174 | if (drv->pm->freeze) | |
175 | ret = drv->pm->freeze(dev); | |
176 | } else { | |
177 | ret = amba_legacy_suspend(dev, PMSG_FREEZE); | |
178 | } | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
ba74ec7f RV |
183 | static int amba_pm_thaw(struct device *dev) |
184 | { | |
185 | struct device_driver *drv = dev->driver; | |
186 | int ret = 0; | |
187 | ||
188 | if (!drv) | |
189 | return 0; | |
190 | ||
191 | if (drv->pm) { | |
192 | if (drv->pm->thaw) | |
193 | ret = drv->pm->thaw(dev); | |
194 | } else { | |
195 | ret = amba_legacy_resume(dev); | |
196 | } | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
ba74ec7f RV |
201 | static int amba_pm_poweroff(struct device *dev) |
202 | { | |
203 | struct device_driver *drv = dev->driver; | |
204 | int ret = 0; | |
205 | ||
206 | if (!drv) | |
207 | return 0; | |
208 | ||
209 | if (drv->pm) { | |
210 | if (drv->pm->poweroff) | |
211 | ret = drv->pm->poweroff(dev); | |
212 | } else { | |
213 | ret = amba_legacy_suspend(dev, PMSG_HIBERNATE); | |
214 | } | |
215 | ||
216 | return ret; | |
217 | } | |
218 | ||
ba74ec7f RV |
219 | static int amba_pm_restore(struct device *dev) |
220 | { | |
221 | struct device_driver *drv = dev->driver; | |
222 | int ret = 0; | |
223 | ||
224 | if (!drv) | |
225 | return 0; | |
226 | ||
227 | if (drv->pm) { | |
228 | if (drv->pm->restore) | |
229 | ret = drv->pm->restore(dev); | |
230 | } else { | |
231 | ret = amba_legacy_resume(dev); | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
1f112cee | 237 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
ba74ec7f RV |
238 | |
239 | #define amba_pm_freeze NULL | |
240 | #define amba_pm_thaw NULL | |
241 | #define amba_pm_poweroff NULL | |
242 | #define amba_pm_restore NULL | |
ba74ec7f | 243 | |
1f112cee | 244 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
ba74ec7f | 245 | |
92b97f0a RK |
246 | #ifdef CONFIG_PM_RUNTIME |
247 | /* | |
248 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
249 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
250 | * does not result in loss of context. However, disabling vcore power | |
251 | * would do, so we leave that to the driver. | |
252 | */ | |
253 | static int amba_pm_runtime_suspend(struct device *dev) | |
254 | { | |
255 | struct amba_device *pcdev = to_amba_device(dev); | |
256 | int ret = pm_generic_runtime_suspend(dev); | |
257 | ||
258 | if (ret == 0 && dev->driver) | |
259 | clk_disable(pcdev->pclk); | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | static int amba_pm_runtime_resume(struct device *dev) | |
265 | { | |
266 | struct amba_device *pcdev = to_amba_device(dev); | |
267 | int ret; | |
268 | ||
269 | if (dev->driver) { | |
270 | ret = clk_enable(pcdev->pclk); | |
271 | /* Failure is probably fatal to the system, but... */ | |
272 | if (ret) | |
273 | return ret; | |
274 | } | |
275 | ||
276 | return pm_generic_runtime_resume(dev); | |
277 | } | |
278 | #endif | |
279 | ||
ba74ec7f RV |
280 | #ifdef CONFIG_PM |
281 | ||
282 | static const struct dev_pm_ops amba_pm = { | |
ba74ec7f RV |
283 | .suspend = amba_pm_suspend, |
284 | .resume = amba_pm_resume, | |
285 | .freeze = amba_pm_freeze, | |
286 | .thaw = amba_pm_thaw, | |
287 | .poweroff = amba_pm_poweroff, | |
288 | .restore = amba_pm_restore, | |
ba74ec7f | 289 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
290 | amba_pm_runtime_suspend, |
291 | amba_pm_runtime_resume, | |
ba74ec7f RV |
292 | pm_generic_runtime_idle |
293 | ) | |
294 | }; | |
295 | ||
296 | #define AMBA_PM (&amba_pm) | |
297 | ||
298 | #else /* !CONFIG_PM */ | |
299 | ||
300 | #define AMBA_PM NULL | |
301 | ||
302 | #endif /* !CONFIG_PM */ | |
303 | ||
1da177e4 LT |
304 | /* |
305 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
306 | * so we call the bus "amba". | |
307 | */ | |
394d5aef | 308 | struct bus_type amba_bustype = { |
1da177e4 | 309 | .name = "amba", |
96b13f5c | 310 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 311 | .match = amba_match, |
6d20b035 | 312 | .uevent = amba_uevent, |
ba74ec7f | 313 | .pm = AMBA_PM, |
1da177e4 LT |
314 | }; |
315 | ||
316 | static int __init amba_init(void) | |
317 | { | |
318 | return bus_register(&amba_bustype); | |
319 | } | |
320 | ||
321 | postcore_initcall(amba_init); | |
322 | ||
7cfe2494 RK |
323 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
324 | { | |
325 | struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk"); | |
326 | int ret; | |
327 | ||
328 | pcdev->pclk = pclk; | |
329 | ||
330 | if (IS_ERR(pclk)) | |
331 | return PTR_ERR(pclk); | |
332 | ||
ac3e2fa6 RK |
333 | ret = clk_prepare(pclk); |
334 | if (ret) { | |
335 | clk_put(pclk); | |
336 | return ret; | |
337 | } | |
338 | ||
7cfe2494 | 339 | ret = clk_enable(pclk); |
ac3e2fa6 RK |
340 | if (ret) { |
341 | clk_unprepare(pclk); | |
7cfe2494 | 342 | clk_put(pclk); |
ac3e2fa6 | 343 | } |
7cfe2494 RK |
344 | |
345 | return ret; | |
346 | } | |
347 | ||
348 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
349 | { | |
350 | struct clk *pclk = pcdev->pclk; | |
351 | ||
352 | clk_disable(pclk); | |
ac3e2fa6 | 353 | clk_unprepare(pclk); |
7cfe2494 RK |
354 | clk_put(pclk); |
355 | } | |
356 | ||
65500fa9 LW |
357 | static int amba_get_enable_vcore(struct amba_device *pcdev) |
358 | { | |
359 | struct regulator *vcore = regulator_get(&pcdev->dev, "vcore"); | |
360 | int ret; | |
361 | ||
362 | pcdev->vcore = vcore; | |
363 | ||
364 | if (IS_ERR(vcore)) { | |
365 | /* It is OK not to supply a vcore regulator */ | |
366 | if (PTR_ERR(vcore) == -ENODEV) | |
367 | return 0; | |
368 | return PTR_ERR(vcore); | |
369 | } | |
370 | ||
371 | ret = regulator_enable(vcore); | |
372 | if (ret) { | |
373 | regulator_put(vcore); | |
374 | pcdev->vcore = ERR_PTR(-ENODEV); | |
375 | } | |
376 | ||
377 | return ret; | |
378 | } | |
379 | ||
380 | static void amba_put_disable_vcore(struct amba_device *pcdev) | |
381 | { | |
382 | struct regulator *vcore = pcdev->vcore; | |
383 | ||
384 | if (!IS_ERR(vcore)) { | |
385 | regulator_disable(vcore); | |
386 | regulator_put(vcore); | |
387 | } | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /* |
391 | * These are the device model conversion veneers; they convert the | |
392 | * device model structures to our more specific structures. | |
393 | */ | |
394 | static int amba_probe(struct device *dev) | |
395 | { | |
396 | struct amba_device *pcdev = to_amba_device(dev); | |
397 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 398 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 399 | int ret; |
1da177e4 | 400 | |
7cfe2494 | 401 | do { |
65500fa9 LW |
402 | ret = amba_get_enable_vcore(pcdev); |
403 | if (ret) | |
404 | break; | |
405 | ||
7cfe2494 RK |
406 | ret = amba_get_enable_pclk(pcdev); |
407 | if (ret) | |
408 | break; | |
409 | ||
92b97f0a RK |
410 | pm_runtime_get_noresume(dev); |
411 | pm_runtime_set_active(dev); | |
412 | pm_runtime_enable(dev); | |
413 | ||
7cfe2494 RK |
414 | ret = pcdrv->probe(pcdev, id); |
415 | if (ret == 0) | |
416 | break; | |
1da177e4 | 417 | |
92b97f0a RK |
418 | pm_runtime_disable(dev); |
419 | pm_runtime_set_suspended(dev); | |
420 | pm_runtime_put_noidle(dev); | |
421 | ||
7cfe2494 | 422 | amba_put_disable_pclk(pcdev); |
65500fa9 | 423 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
424 | } while (0); |
425 | ||
426 | return ret; | |
1da177e4 LT |
427 | } |
428 | ||
429 | static int amba_remove(struct device *dev) | |
430 | { | |
7cfe2494 | 431 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 432 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
433 | int ret; |
434 | ||
435 | pm_runtime_get_sync(dev); | |
436 | ret = drv->remove(pcdev); | |
437 | pm_runtime_put_noidle(dev); | |
438 | ||
439 | /* Undo the runtime PM settings in amba_probe() */ | |
440 | pm_runtime_disable(dev); | |
441 | pm_runtime_set_suspended(dev); | |
442 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
443 | |
444 | amba_put_disable_pclk(pcdev); | |
65500fa9 | 445 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
446 | |
447 | return ret; | |
1da177e4 LT |
448 | } |
449 | ||
450 | static void amba_shutdown(struct device *dev) | |
451 | { | |
452 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
453 | drv->shutdown(to_amba_device(dev)); | |
454 | } | |
455 | ||
456 | /** | |
457 | * amba_driver_register - register an AMBA device driver | |
458 | * @drv: amba device driver structure | |
459 | * | |
460 | * Register an AMBA device driver with the Linux device model | |
461 | * core. If devices pre-exist, the drivers probe function will | |
462 | * be called. | |
463 | */ | |
464 | int amba_driver_register(struct amba_driver *drv) | |
465 | { | |
466 | drv->drv.bus = &amba_bustype; | |
467 | ||
468 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
469 | SETFN(probe); | |
470 | SETFN(remove); | |
471 | SETFN(shutdown); | |
472 | ||
473 | return driver_register(&drv->drv); | |
474 | } | |
475 | ||
476 | /** | |
477 | * amba_driver_unregister - remove an AMBA device driver | |
478 | * @drv: AMBA device driver structure to remove | |
479 | * | |
480 | * Unregister an AMBA device driver from the Linux device | |
481 | * model. The device model will call the drivers remove function | |
482 | * for each device the device driver is currently handling. | |
483 | */ | |
484 | void amba_driver_unregister(struct amba_driver *drv) | |
485 | { | |
486 | driver_unregister(&drv->drv); | |
487 | } | |
488 | ||
489 | ||
490 | static void amba_device_release(struct device *dev) | |
491 | { | |
492 | struct amba_device *d = to_amba_device(dev); | |
493 | ||
494 | if (d->res.parent) | |
495 | release_resource(&d->res); | |
496 | kfree(d); | |
497 | } | |
498 | ||
1da177e4 | 499 | /** |
d5dc9271 RK |
500 | * amba_device_add - add a previously allocated AMBA device structure |
501 | * @dev: AMBA device allocated by amba_device_alloc | |
502 | * @parent: resource parent for this devices resources | |
1da177e4 | 503 | * |
d5dc9271 RK |
504 | * Claim the resource, and read the device cell ID if not already |
505 | * initialized. Register the AMBA device with the Linux device | |
506 | * manager. | |
1da177e4 | 507 | */ |
d5dc9271 | 508 | int amba_device_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 509 | { |
8afe0b96 | 510 | u32 size; |
1da177e4 LT |
511 | void __iomem *tmp; |
512 | int i, ret; | |
513 | ||
2eac58d5 RK |
514 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
515 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
516 | ||
1da177e4 | 517 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
518 | if (ret) |
519 | goto err_out; | |
520 | ||
97ceed1f LW |
521 | /* Hard-coded primecell ID instead of plug-n-play */ |
522 | if (dev->periphid != 0) | |
523 | goto skip_probe; | |
524 | ||
8afe0b96 LC |
525 | /* |
526 | * Dynamically calculate the size of the resource | |
527 | * and use this for iomap | |
528 | */ | |
529 | size = resource_size(&dev->res); | |
530 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
531 | if (!tmp) { |
532 | ret = -ENOMEM; | |
533 | goto err_release; | |
1da177e4 | 534 | } |
96b13f5c | 535 | |
7cfe2494 RK |
536 | ret = amba_get_enable_pclk(dev); |
537 | if (ret == 0) { | |
538 | u32 pid, cid; | |
96b13f5c | 539 | |
7cfe2494 RK |
540 | /* |
541 | * Read pid and cid based on size of resource | |
542 | * they are located at end of region | |
543 | */ | |
544 | for (pid = 0, i = 0; i < 4; i++) | |
545 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
546 | (i * 8); | |
547 | for (cid = 0, i = 0; i < 4; i++) | |
548 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
549 | (i * 8); | |
96b13f5c | 550 | |
7cfe2494 | 551 | amba_put_disable_pclk(dev); |
96b13f5c | 552 | |
01723a95 | 553 | if (cid == AMBA_CID) |
7cfe2494 RK |
554 | dev->periphid = pid; |
555 | ||
556 | if (!dev->periphid) | |
557 | ret = -ENODEV; | |
96b13f5c RK |
558 | } |
559 | ||
7cfe2494 RK |
560 | iounmap(tmp); |
561 | ||
562 | if (ret) | |
563 | goto err_release; | |
564 | ||
97ceed1f | 565 | skip_probe: |
557dca5f | 566 | ret = device_add(&dev->dev); |
96b13f5c RK |
567 | if (ret) |
568 | goto err_release; | |
569 | ||
023f117c | 570 | if (dev->irq[0] && dev->irq[0] != NO_IRQ) |
96b13f5c | 571 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
023f117c | 572 | if (ret == 0 && dev->irq[1] && dev->irq[1] != NO_IRQ) |
96b13f5c RK |
573 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
574 | if (ret == 0) | |
575 | return ret; | |
576 | ||
577 | device_unregister(&dev->dev); | |
578 | ||
579 | err_release: | |
580 | release_resource(&dev->res); | |
581 | err_out: | |
1da177e4 LT |
582 | return ret; |
583 | } | |
d5dc9271 RK |
584 | EXPORT_SYMBOL_GPL(amba_device_add); |
585 | ||
586 | static void amba_device_initialize(struct amba_device *dev, const char *name) | |
587 | { | |
588 | device_initialize(&dev->dev); | |
589 | if (name) | |
590 | dev_set_name(&dev->dev, "%s", name); | |
591 | dev->dev.release = amba_device_release; | |
592 | dev->dev.bus = &amba_bustype; | |
593 | dev->dev.dma_mask = &dev->dma_mask; | |
594 | dev->res.name = dev_name(&dev->dev); | |
595 | } | |
596 | ||
597 | /** | |
598 | * amba_device_alloc - allocate an AMBA device | |
599 | * @name: sysfs name of the AMBA device | |
600 | * @base: base of AMBA device | |
601 | * @size: size of AMBA device | |
602 | * | |
603 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
604 | * on failure. | |
605 | */ | |
606 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
607 | size_t size) | |
608 | { | |
609 | struct amba_device *dev; | |
610 | ||
611 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
612 | if (dev) { | |
613 | amba_device_initialize(dev, name); | |
614 | dev->res.start = base; | |
615 | dev->res.end = base + size - 1; | |
616 | dev->res.flags = IORESOURCE_MEM; | |
617 | } | |
618 | ||
619 | return dev; | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
622 | ||
623 | /** | |
624 | * amba_device_register - register an AMBA device | |
625 | * @dev: AMBA device to register | |
626 | * @parent: parent memory resource | |
627 | * | |
628 | * Setup the AMBA device, reading the cell ID if present. | |
629 | * Claim the resource, and register the AMBA device with | |
630 | * the Linux device manager. | |
631 | */ | |
632 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
633 | { | |
634 | amba_device_initialize(dev, dev->dev.init_name); | |
635 | dev->dev.init_name = NULL; | |
636 | ||
637 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
638 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
639 | ||
640 | return amba_device_add(dev, parent); | |
641 | } | |
642 | ||
643 | /** | |
644 | * amba_device_put - put an AMBA device | |
645 | * @dev: AMBA device to put | |
646 | */ | |
647 | void amba_device_put(struct amba_device *dev) | |
648 | { | |
649 | put_device(&dev->dev); | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
652 | |
653 | /** | |
654 | * amba_device_unregister - unregister an AMBA device | |
655 | * @dev: AMBA device to remove | |
656 | * | |
657 | * Remove the specified AMBA device from the Linux device | |
658 | * manager. All files associated with this object will be | |
659 | * destroyed, and device drivers notified that the device has | |
660 | * been removed. The AMBA device's resources including | |
661 | * the amba_device structure will be freed once all | |
662 | * references to it have been dropped. | |
663 | */ | |
664 | void amba_device_unregister(struct amba_device *dev) | |
665 | { | |
666 | device_unregister(&dev->dev); | |
667 | } | |
668 | ||
669 | ||
670 | struct find_data { | |
671 | struct amba_device *dev; | |
672 | struct device *parent; | |
673 | const char *busid; | |
674 | unsigned int id; | |
675 | unsigned int mask; | |
676 | }; | |
677 | ||
678 | static int amba_find_match(struct device *dev, void *data) | |
679 | { | |
680 | struct find_data *d = data; | |
681 | struct amba_device *pcdev = to_amba_device(dev); | |
682 | int r; | |
683 | ||
684 | r = (pcdev->periphid & d->mask) == d->id; | |
685 | if (d->parent) | |
686 | r &= d->parent == dev->parent; | |
687 | if (d->busid) | |
9d6b4c82 | 688 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
689 | |
690 | if (r) { | |
691 | get_device(dev); | |
692 | d->dev = pcdev; | |
693 | } | |
694 | ||
695 | return r; | |
696 | } | |
697 | ||
698 | /** | |
699 | * amba_find_device - locate an AMBA device given a bus id | |
700 | * @busid: bus id for device (or NULL) | |
701 | * @parent: parent device (or NULL) | |
702 | * @id: peripheral ID (or 0) | |
703 | * @mask: peripheral ID mask (or 0) | |
704 | * | |
705 | * Return the AMBA device corresponding to the supplied parameters. | |
706 | * If no device matches, returns NULL. | |
707 | * | |
708 | * NOTE: When a valid device is found, its refcount is | |
709 | * incremented, and must be decremented before the returned | |
710 | * reference. | |
711 | */ | |
712 | struct amba_device * | |
713 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
714 | unsigned int mask) | |
715 | { | |
716 | struct find_data data; | |
717 | ||
718 | data.dev = NULL; | |
719 | data.parent = parent; | |
720 | data.busid = busid; | |
721 | data.id = id; | |
722 | data.mask = mask; | |
723 | ||
724 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
725 | ||
726 | return data.dev; | |
727 | } | |
728 | ||
729 | /** | |
730 | * amba_request_regions - request all mem regions associated with device | |
731 | * @dev: amba_device structure for device | |
732 | * @name: name, or NULL to use driver name | |
733 | */ | |
734 | int amba_request_regions(struct amba_device *dev, const char *name) | |
735 | { | |
736 | int ret = 0; | |
8afe0b96 | 737 | u32 size; |
1da177e4 LT |
738 | |
739 | if (!name) | |
740 | name = dev->dev.driver->name; | |
741 | ||
8afe0b96 LC |
742 | size = resource_size(&dev->res); |
743 | ||
744 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
745 | ret = -EBUSY; |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
750 | /** | |
25985edc | 751 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
752 | * @dev: amba_device structure for device |
753 | * | |
754 | * Release regions claimed by a successful call to amba_request_regions. | |
755 | */ | |
756 | void amba_release_regions(struct amba_device *dev) | |
757 | { | |
8afe0b96 LC |
758 | u32 size; |
759 | ||
760 | size = resource_size(&dev->res); | |
761 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
762 | } |
763 | ||
764 | EXPORT_SYMBOL(amba_driver_register); | |
765 | EXPORT_SYMBOL(amba_driver_unregister); | |
766 | EXPORT_SYMBOL(amba_device_register); | |
767 | EXPORT_SYMBOL(amba_device_unregister); | |
768 | EXPORT_SYMBOL(amba_find_device); | |
769 | EXPORT_SYMBOL(amba_request_regions); | |
770 | EXPORT_SYMBOL(amba_release_regions); |