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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/common/amba.c | |
3 | * | |
4 | * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
4e57b681 TS |
13 | #include <linux/string.h> |
14 | #include <linux/slab.h> | |
934848da | 15 | #include <linux/io.h> |
ba74ec7f RV |
16 | #include <linux/pm.h> |
17 | #include <linux/pm_runtime.h> | |
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); |
bf62456e | 55 | return retval; |
1da177e4 LT |
56 | } |
57 | #else | |
6d20b035 | 58 | #define amba_uevent NULL |
1da177e4 LT |
59 | #endif |
60 | ||
96b13f5c RK |
61 | #define amba_attr_func(name,fmt,arg...) \ |
62 | static ssize_t name##_show(struct device *_dev, \ | |
63 | struct device_attribute *attr, char *buf) \ | |
64 | { \ | |
65 | struct amba_device *dev = to_amba_device(_dev); \ | |
66 | return sprintf(buf, fmt, arg); \ | |
67 | } | |
68 | ||
69 | #define amba_attr(name,fmt,arg...) \ | |
70 | amba_attr_func(name,fmt,arg) \ | |
71 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
72 | ||
73 | amba_attr_func(id, "%08x\n", dev->periphid); | |
74 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
75 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
76 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
77 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
78 | dev->res.flags); | |
79 | ||
80 | static struct device_attribute amba_dev_attrs[] = { | |
81 | __ATTR_RO(id), | |
82 | __ATTR_RO(resource), | |
83 | __ATTR_NULL, | |
84 | }; | |
85 | ||
ba74ec7f RV |
86 | #ifdef CONFIG_PM_SLEEP |
87 | ||
88 | static int amba_legacy_suspend(struct device *dev, pm_message_t mesg) | |
89 | { | |
90 | struct amba_driver *adrv = to_amba_driver(dev->driver); | |
91 | struct amba_device *adev = to_amba_device(dev); | |
92 | int ret = 0; | |
93 | ||
94 | if (dev->driver && adrv->suspend) | |
95 | ret = adrv->suspend(adev, mesg); | |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
100 | static int amba_legacy_resume(struct device *dev) | |
101 | { | |
102 | struct amba_driver *adrv = to_amba_driver(dev->driver); | |
103 | struct amba_device *adev = to_amba_device(dev); | |
104 | int ret = 0; | |
105 | ||
106 | if (dev->driver && adrv->resume) | |
107 | ret = adrv->resume(adev); | |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
112 | static int amba_pm_prepare(struct device *dev) | |
113 | { | |
114 | struct device_driver *drv = dev->driver; | |
115 | int ret = 0; | |
116 | ||
117 | if (drv && drv->pm && drv->pm->prepare) | |
118 | ret = drv->pm->prepare(dev); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | static void amba_pm_complete(struct device *dev) | |
124 | { | |
125 | struct device_driver *drv = dev->driver; | |
126 | ||
127 | if (drv && drv->pm && drv->pm->complete) | |
128 | drv->pm->complete(dev); | |
129 | } | |
130 | ||
131 | #else /* !CONFIG_PM_SLEEP */ | |
132 | ||
133 | #define amba_pm_prepare NULL | |
134 | #define amba_pm_complete NULL | |
135 | ||
136 | #endif /* !CONFIG_PM_SLEEP */ | |
137 | ||
138 | #ifdef CONFIG_SUSPEND | |
139 | ||
140 | static int amba_pm_suspend(struct device *dev) | |
141 | { | |
142 | struct device_driver *drv = dev->driver; | |
143 | int ret = 0; | |
144 | ||
145 | if (!drv) | |
146 | return 0; | |
147 | ||
148 | if (drv->pm) { | |
149 | if (drv->pm->suspend) | |
150 | ret = drv->pm->suspend(dev); | |
151 | } else { | |
152 | ret = amba_legacy_suspend(dev, PMSG_SUSPEND); | |
153 | } | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static int amba_pm_suspend_noirq(struct device *dev) | |
159 | { | |
160 | struct device_driver *drv = dev->driver; | |
161 | int ret = 0; | |
162 | ||
163 | if (!drv) | |
164 | return 0; | |
165 | ||
166 | if (drv->pm) { | |
167 | if (drv->pm->suspend_noirq) | |
168 | ret = drv->pm->suspend_noirq(dev); | |
169 | } | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
174 | static int amba_pm_resume(struct device *dev) | |
175 | { | |
176 | struct device_driver *drv = dev->driver; | |
177 | int ret = 0; | |
178 | ||
179 | if (!drv) | |
180 | return 0; | |
181 | ||
182 | if (drv->pm) { | |
183 | if (drv->pm->resume) | |
184 | ret = drv->pm->resume(dev); | |
185 | } else { | |
186 | ret = amba_legacy_resume(dev); | |
187 | } | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
192 | static int amba_pm_resume_noirq(struct device *dev) | |
193 | { | |
194 | struct device_driver *drv = dev->driver; | |
195 | int ret = 0; | |
196 | ||
197 | if (!drv) | |
198 | return 0; | |
199 | ||
200 | if (drv->pm) { | |
201 | if (drv->pm->resume_noirq) | |
202 | ret = drv->pm->resume_noirq(dev); | |
203 | } | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | #else /* !CONFIG_SUSPEND */ | |
209 | ||
210 | #define amba_pm_suspend NULL | |
211 | #define amba_pm_resume NULL | |
212 | #define amba_pm_suspend_noirq NULL | |
213 | #define amba_pm_resume_noirq NULL | |
214 | ||
215 | #endif /* !CONFIG_SUSPEND */ | |
216 | ||
1f112cee | 217 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
ba74ec7f RV |
218 | |
219 | static int amba_pm_freeze(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->freeze) | |
229 | ret = drv->pm->freeze(dev); | |
230 | } else { | |
231 | ret = amba_legacy_suspend(dev, PMSG_FREEZE); | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
237 | static int amba_pm_freeze_noirq(struct device *dev) | |
238 | { | |
239 | struct device_driver *drv = dev->driver; | |
240 | int ret = 0; | |
241 | ||
242 | if (!drv) | |
243 | return 0; | |
244 | ||
245 | if (drv->pm) { | |
246 | if (drv->pm->freeze_noirq) | |
247 | ret = drv->pm->freeze_noirq(dev); | |
248 | } | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | static int amba_pm_thaw(struct device *dev) | |
254 | { | |
255 | struct device_driver *drv = dev->driver; | |
256 | int ret = 0; | |
257 | ||
258 | if (!drv) | |
259 | return 0; | |
260 | ||
261 | if (drv->pm) { | |
262 | if (drv->pm->thaw) | |
263 | ret = drv->pm->thaw(dev); | |
264 | } else { | |
265 | ret = amba_legacy_resume(dev); | |
266 | } | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
271 | static int amba_pm_thaw_noirq(struct device *dev) | |
272 | { | |
273 | struct device_driver *drv = dev->driver; | |
274 | int ret = 0; | |
275 | ||
276 | if (!drv) | |
277 | return 0; | |
278 | ||
279 | if (drv->pm) { | |
280 | if (drv->pm->thaw_noirq) | |
281 | ret = drv->pm->thaw_noirq(dev); | |
282 | } | |
283 | ||
284 | return ret; | |
285 | } | |
286 | ||
287 | static int amba_pm_poweroff(struct device *dev) | |
288 | { | |
289 | struct device_driver *drv = dev->driver; | |
290 | int ret = 0; | |
291 | ||
292 | if (!drv) | |
293 | return 0; | |
294 | ||
295 | if (drv->pm) { | |
296 | if (drv->pm->poweroff) | |
297 | ret = drv->pm->poweroff(dev); | |
298 | } else { | |
299 | ret = amba_legacy_suspend(dev, PMSG_HIBERNATE); | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | static int amba_pm_poweroff_noirq(struct device *dev) | |
306 | { | |
307 | struct device_driver *drv = dev->driver; | |
308 | int ret = 0; | |
309 | ||
310 | if (!drv) | |
311 | return 0; | |
312 | ||
313 | if (drv->pm) { | |
314 | if (drv->pm->poweroff_noirq) | |
315 | ret = drv->pm->poweroff_noirq(dev); | |
316 | } | |
317 | ||
318 | return ret; | |
319 | } | |
320 | ||
321 | static int amba_pm_restore(struct device *dev) | |
322 | { | |
323 | struct device_driver *drv = dev->driver; | |
324 | int ret = 0; | |
325 | ||
326 | if (!drv) | |
327 | return 0; | |
328 | ||
329 | if (drv->pm) { | |
330 | if (drv->pm->restore) | |
331 | ret = drv->pm->restore(dev); | |
332 | } else { | |
333 | ret = amba_legacy_resume(dev); | |
334 | } | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
339 | static int amba_pm_restore_noirq(struct device *dev) | |
340 | { | |
341 | struct device_driver *drv = dev->driver; | |
342 | int ret = 0; | |
343 | ||
344 | if (!drv) | |
345 | return 0; | |
346 | ||
347 | if (drv->pm) { | |
348 | if (drv->pm->restore_noirq) | |
349 | ret = drv->pm->restore_noirq(dev); | |
350 | } | |
351 | ||
352 | return ret; | |
353 | } | |
354 | ||
1f112cee | 355 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
ba74ec7f RV |
356 | |
357 | #define amba_pm_freeze NULL | |
358 | #define amba_pm_thaw NULL | |
359 | #define amba_pm_poweroff NULL | |
360 | #define amba_pm_restore NULL | |
361 | #define amba_pm_freeze_noirq NULL | |
362 | #define amba_pm_thaw_noirq NULL | |
363 | #define amba_pm_poweroff_noirq NULL | |
364 | #define amba_pm_restore_noirq NULL | |
365 | ||
1f112cee | 366 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
ba74ec7f RV |
367 | |
368 | #ifdef CONFIG_PM | |
369 | ||
370 | static const struct dev_pm_ops amba_pm = { | |
371 | .prepare = amba_pm_prepare, | |
372 | .complete = amba_pm_complete, | |
373 | .suspend = amba_pm_suspend, | |
374 | .resume = amba_pm_resume, | |
375 | .freeze = amba_pm_freeze, | |
376 | .thaw = amba_pm_thaw, | |
377 | .poweroff = amba_pm_poweroff, | |
378 | .restore = amba_pm_restore, | |
379 | .suspend_noirq = amba_pm_suspend_noirq, | |
380 | .resume_noirq = amba_pm_resume_noirq, | |
381 | .freeze_noirq = amba_pm_freeze_noirq, | |
382 | .thaw_noirq = amba_pm_thaw_noirq, | |
383 | .poweroff_noirq = amba_pm_poweroff_noirq, | |
384 | .restore_noirq = amba_pm_restore_noirq, | |
385 | SET_RUNTIME_PM_OPS( | |
386 | pm_generic_runtime_suspend, | |
387 | pm_generic_runtime_resume, | |
388 | pm_generic_runtime_idle | |
389 | ) | |
390 | }; | |
391 | ||
392 | #define AMBA_PM (&amba_pm) | |
393 | ||
394 | #else /* !CONFIG_PM */ | |
395 | ||
396 | #define AMBA_PM NULL | |
397 | ||
398 | #endif /* !CONFIG_PM */ | |
399 | ||
1da177e4 LT |
400 | /* |
401 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
402 | * so we call the bus "amba". | |
403 | */ | |
394d5aef | 404 | struct bus_type amba_bustype = { |
1da177e4 | 405 | .name = "amba", |
96b13f5c | 406 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 407 | .match = amba_match, |
6d20b035 | 408 | .uevent = amba_uevent, |
ba74ec7f | 409 | .pm = AMBA_PM, |
1da177e4 LT |
410 | }; |
411 | ||
412 | static int __init amba_init(void) | |
413 | { | |
414 | return bus_register(&amba_bustype); | |
415 | } | |
416 | ||
417 | postcore_initcall(amba_init); | |
418 | ||
7cfe2494 RK |
419 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
420 | { | |
421 | struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk"); | |
422 | int ret; | |
423 | ||
424 | pcdev->pclk = pclk; | |
425 | ||
426 | if (IS_ERR(pclk)) | |
427 | return PTR_ERR(pclk); | |
428 | ||
429 | ret = clk_enable(pclk); | |
430 | if (ret) | |
431 | clk_put(pclk); | |
432 | ||
433 | return ret; | |
434 | } | |
435 | ||
436 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
437 | { | |
438 | struct clk *pclk = pcdev->pclk; | |
439 | ||
440 | clk_disable(pclk); | |
441 | clk_put(pclk); | |
442 | } | |
443 | ||
65500fa9 LW |
444 | static int amba_get_enable_vcore(struct amba_device *pcdev) |
445 | { | |
446 | struct regulator *vcore = regulator_get(&pcdev->dev, "vcore"); | |
447 | int ret; | |
448 | ||
449 | pcdev->vcore = vcore; | |
450 | ||
451 | if (IS_ERR(vcore)) { | |
452 | /* It is OK not to supply a vcore regulator */ | |
453 | if (PTR_ERR(vcore) == -ENODEV) | |
454 | return 0; | |
455 | return PTR_ERR(vcore); | |
456 | } | |
457 | ||
458 | ret = regulator_enable(vcore); | |
459 | if (ret) { | |
460 | regulator_put(vcore); | |
461 | pcdev->vcore = ERR_PTR(-ENODEV); | |
462 | } | |
463 | ||
464 | return ret; | |
465 | } | |
466 | ||
467 | static void amba_put_disable_vcore(struct amba_device *pcdev) | |
468 | { | |
469 | struct regulator *vcore = pcdev->vcore; | |
470 | ||
471 | if (!IS_ERR(vcore)) { | |
472 | regulator_disable(vcore); | |
473 | regulator_put(vcore); | |
474 | } | |
475 | } | |
476 | ||
1da177e4 LT |
477 | /* |
478 | * These are the device model conversion veneers; they convert the | |
479 | * device model structures to our more specific structures. | |
480 | */ | |
481 | static int amba_probe(struct device *dev) | |
482 | { | |
483 | struct amba_device *pcdev = to_amba_device(dev); | |
484 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 485 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 486 | int ret; |
1da177e4 | 487 | |
7cfe2494 | 488 | do { |
65500fa9 LW |
489 | ret = amba_get_enable_vcore(pcdev); |
490 | if (ret) | |
491 | break; | |
492 | ||
7cfe2494 RK |
493 | ret = amba_get_enable_pclk(pcdev); |
494 | if (ret) | |
495 | break; | |
496 | ||
497 | ret = pcdrv->probe(pcdev, id); | |
498 | if (ret == 0) | |
499 | break; | |
1da177e4 | 500 | |
7cfe2494 | 501 | amba_put_disable_pclk(pcdev); |
65500fa9 | 502 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
503 | } while (0); |
504 | ||
505 | return ret; | |
1da177e4 LT |
506 | } |
507 | ||
508 | static int amba_remove(struct device *dev) | |
509 | { | |
7cfe2494 | 510 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 511 | struct amba_driver *drv = to_amba_driver(dev->driver); |
7cfe2494 RK |
512 | int ret = drv->remove(pcdev); |
513 | ||
514 | amba_put_disable_pclk(pcdev); | |
65500fa9 | 515 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
516 | |
517 | return ret; | |
1da177e4 LT |
518 | } |
519 | ||
520 | static void amba_shutdown(struct device *dev) | |
521 | { | |
522 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
523 | drv->shutdown(to_amba_device(dev)); | |
524 | } | |
525 | ||
526 | /** | |
527 | * amba_driver_register - register an AMBA device driver | |
528 | * @drv: amba device driver structure | |
529 | * | |
530 | * Register an AMBA device driver with the Linux device model | |
531 | * core. If devices pre-exist, the drivers probe function will | |
532 | * be called. | |
533 | */ | |
534 | int amba_driver_register(struct amba_driver *drv) | |
535 | { | |
536 | drv->drv.bus = &amba_bustype; | |
537 | ||
538 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
539 | SETFN(probe); | |
540 | SETFN(remove); | |
541 | SETFN(shutdown); | |
542 | ||
543 | return driver_register(&drv->drv); | |
544 | } | |
545 | ||
546 | /** | |
547 | * amba_driver_unregister - remove an AMBA device driver | |
548 | * @drv: AMBA device driver structure to remove | |
549 | * | |
550 | * Unregister an AMBA device driver from the Linux device | |
551 | * model. The device model will call the drivers remove function | |
552 | * for each device the device driver is currently handling. | |
553 | */ | |
554 | void amba_driver_unregister(struct amba_driver *drv) | |
555 | { | |
556 | driver_unregister(&drv->drv); | |
557 | } | |
558 | ||
559 | ||
560 | static void amba_device_release(struct device *dev) | |
561 | { | |
562 | struct amba_device *d = to_amba_device(dev); | |
563 | ||
564 | if (d->res.parent) | |
565 | release_resource(&d->res); | |
566 | kfree(d); | |
567 | } | |
568 | ||
1da177e4 LT |
569 | /** |
570 | * amba_device_register - register an AMBA device | |
571 | * @dev: AMBA device to register | |
572 | * @parent: parent memory resource | |
573 | * | |
574 | * Setup the AMBA device, reading the cell ID if present. | |
575 | * Claim the resource, and register the AMBA device with | |
576 | * the Linux device manager. | |
577 | */ | |
578 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
579 | { | |
8afe0b96 | 580 | u32 size; |
1da177e4 LT |
581 | void __iomem *tmp; |
582 | int i, ret; | |
583 | ||
557dca5f RK |
584 | device_initialize(&dev->dev); |
585 | ||
586 | /* | |
587 | * Copy from device_add | |
588 | */ | |
589 | if (dev->dev.init_name) { | |
590 | dev_set_name(&dev->dev, "%s", dev->dev.init_name); | |
591 | dev->dev.init_name = NULL; | |
592 | } | |
593 | ||
1da177e4 LT |
594 | dev->dev.release = amba_device_release; |
595 | dev->dev.bus = &amba_bustype; | |
596 | dev->dev.dma_mask = &dev->dma_mask; | |
9d6b4c82 | 597 | dev->res.name = dev_name(&dev->dev); |
1da177e4 LT |
598 | |
599 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
600 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
601 | ||
602 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
603 | if (ret) |
604 | goto err_out; | |
605 | ||
8afe0b96 LC |
606 | /* |
607 | * Dynamically calculate the size of the resource | |
608 | * and use this for iomap | |
609 | */ | |
610 | size = resource_size(&dev->res); | |
611 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
612 | if (!tmp) { |
613 | ret = -ENOMEM; | |
614 | goto err_release; | |
1da177e4 | 615 | } |
96b13f5c | 616 | |
7cfe2494 RK |
617 | ret = amba_get_enable_pclk(dev); |
618 | if (ret == 0) { | |
619 | u32 pid, cid; | |
96b13f5c | 620 | |
7cfe2494 RK |
621 | /* |
622 | * Read pid and cid based on size of resource | |
623 | * they are located at end of region | |
624 | */ | |
625 | for (pid = 0, i = 0; i < 4; i++) | |
626 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
627 | (i * 8); | |
628 | for (cid = 0, i = 0; i < 4; i++) | |
629 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
630 | (i * 8); | |
96b13f5c | 631 | |
7cfe2494 | 632 | amba_put_disable_pclk(dev); |
96b13f5c | 633 | |
01723a95 | 634 | if (cid == AMBA_CID) |
7cfe2494 RK |
635 | dev->periphid = pid; |
636 | ||
637 | if (!dev->periphid) | |
638 | ret = -ENODEV; | |
96b13f5c RK |
639 | } |
640 | ||
7cfe2494 RK |
641 | iounmap(tmp); |
642 | ||
643 | if (ret) | |
644 | goto err_release; | |
645 | ||
557dca5f | 646 | ret = device_add(&dev->dev); |
96b13f5c RK |
647 | if (ret) |
648 | goto err_release; | |
649 | ||
650 | if (dev->irq[0] != NO_IRQ) | |
651 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
652 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
653 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
654 | if (ret == 0) | |
655 | return ret; | |
656 | ||
657 | device_unregister(&dev->dev); | |
658 | ||
659 | err_release: | |
660 | release_resource(&dev->res); | |
661 | err_out: | |
1da177e4 LT |
662 | return ret; |
663 | } | |
664 | ||
665 | /** | |
666 | * amba_device_unregister - unregister an AMBA device | |
667 | * @dev: AMBA device to remove | |
668 | * | |
669 | * Remove the specified AMBA device from the Linux device | |
670 | * manager. All files associated with this object will be | |
671 | * destroyed, and device drivers notified that the device has | |
672 | * been removed. The AMBA device's resources including | |
673 | * the amba_device structure will be freed once all | |
674 | * references to it have been dropped. | |
675 | */ | |
676 | void amba_device_unregister(struct amba_device *dev) | |
677 | { | |
678 | device_unregister(&dev->dev); | |
679 | } | |
680 | ||
681 | ||
682 | struct find_data { | |
683 | struct amba_device *dev; | |
684 | struct device *parent; | |
685 | const char *busid; | |
686 | unsigned int id; | |
687 | unsigned int mask; | |
688 | }; | |
689 | ||
690 | static int amba_find_match(struct device *dev, void *data) | |
691 | { | |
692 | struct find_data *d = data; | |
693 | struct amba_device *pcdev = to_amba_device(dev); | |
694 | int r; | |
695 | ||
696 | r = (pcdev->periphid & d->mask) == d->id; | |
697 | if (d->parent) | |
698 | r &= d->parent == dev->parent; | |
699 | if (d->busid) | |
9d6b4c82 | 700 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
701 | |
702 | if (r) { | |
703 | get_device(dev); | |
704 | d->dev = pcdev; | |
705 | } | |
706 | ||
707 | return r; | |
708 | } | |
709 | ||
710 | /** | |
711 | * amba_find_device - locate an AMBA device given a bus id | |
712 | * @busid: bus id for device (or NULL) | |
713 | * @parent: parent device (or NULL) | |
714 | * @id: peripheral ID (or 0) | |
715 | * @mask: peripheral ID mask (or 0) | |
716 | * | |
717 | * Return the AMBA device corresponding to the supplied parameters. | |
718 | * If no device matches, returns NULL. | |
719 | * | |
720 | * NOTE: When a valid device is found, its refcount is | |
721 | * incremented, and must be decremented before the returned | |
722 | * reference. | |
723 | */ | |
724 | struct amba_device * | |
725 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
726 | unsigned int mask) | |
727 | { | |
728 | struct find_data data; | |
729 | ||
730 | data.dev = NULL; | |
731 | data.parent = parent; | |
732 | data.busid = busid; | |
733 | data.id = id; | |
734 | data.mask = mask; | |
735 | ||
736 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
737 | ||
738 | return data.dev; | |
739 | } | |
740 | ||
741 | /** | |
742 | * amba_request_regions - request all mem regions associated with device | |
743 | * @dev: amba_device structure for device | |
744 | * @name: name, or NULL to use driver name | |
745 | */ | |
746 | int amba_request_regions(struct amba_device *dev, const char *name) | |
747 | { | |
748 | int ret = 0; | |
8afe0b96 | 749 | u32 size; |
1da177e4 LT |
750 | |
751 | if (!name) | |
752 | name = dev->dev.driver->name; | |
753 | ||
8afe0b96 LC |
754 | size = resource_size(&dev->res); |
755 | ||
756 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
757 | ret = -EBUSY; |
758 | ||
759 | return ret; | |
760 | } | |
761 | ||
762 | /** | |
25985edc | 763 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
764 | * @dev: amba_device structure for device |
765 | * | |
766 | * Release regions claimed by a successful call to amba_request_regions. | |
767 | */ | |
768 | void amba_release_regions(struct amba_device *dev) | |
769 | { | |
8afe0b96 LC |
770 | u32 size; |
771 | ||
772 | size = resource_size(&dev->res); | |
773 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
774 | } |
775 | ||
776 | EXPORT_SYMBOL(amba_driver_register); | |
777 | EXPORT_SYMBOL(amba_driver_unregister); | |
778 | EXPORT_SYMBOL(amba_device_register); | |
779 | EXPORT_SYMBOL(amba_device_unregister); | |
780 | EXPORT_SYMBOL(amba_find_device); | |
781 | EXPORT_SYMBOL(amba_request_regions); | |
782 | EXPORT_SYMBOL(amba_release_regions); |