]>
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> | |
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 | 367 | |
92b97f0a RK |
368 | #ifdef CONFIG_PM_RUNTIME |
369 | /* | |
370 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
371 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
372 | * does not result in loss of context. However, disabling vcore power | |
373 | * would do, so we leave that to the driver. | |
374 | */ | |
375 | static int amba_pm_runtime_suspend(struct device *dev) | |
376 | { | |
377 | struct amba_device *pcdev = to_amba_device(dev); | |
378 | int ret = pm_generic_runtime_suspend(dev); | |
379 | ||
380 | if (ret == 0 && dev->driver) | |
381 | clk_disable(pcdev->pclk); | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
386 | static int amba_pm_runtime_resume(struct device *dev) | |
387 | { | |
388 | struct amba_device *pcdev = to_amba_device(dev); | |
389 | int ret; | |
390 | ||
391 | if (dev->driver) { | |
392 | ret = clk_enable(pcdev->pclk); | |
393 | /* Failure is probably fatal to the system, but... */ | |
394 | if (ret) | |
395 | return ret; | |
396 | } | |
397 | ||
398 | return pm_generic_runtime_resume(dev); | |
399 | } | |
400 | #endif | |
401 | ||
ba74ec7f RV |
402 | #ifdef CONFIG_PM |
403 | ||
404 | static const struct dev_pm_ops amba_pm = { | |
405 | .prepare = amba_pm_prepare, | |
406 | .complete = amba_pm_complete, | |
407 | .suspend = amba_pm_suspend, | |
408 | .resume = amba_pm_resume, | |
409 | .freeze = amba_pm_freeze, | |
410 | .thaw = amba_pm_thaw, | |
411 | .poweroff = amba_pm_poweroff, | |
412 | .restore = amba_pm_restore, | |
413 | .suspend_noirq = amba_pm_suspend_noirq, | |
414 | .resume_noirq = amba_pm_resume_noirq, | |
415 | .freeze_noirq = amba_pm_freeze_noirq, | |
416 | .thaw_noirq = amba_pm_thaw_noirq, | |
417 | .poweroff_noirq = amba_pm_poweroff_noirq, | |
418 | .restore_noirq = amba_pm_restore_noirq, | |
419 | SET_RUNTIME_PM_OPS( | |
92b97f0a RK |
420 | amba_pm_runtime_suspend, |
421 | amba_pm_runtime_resume, | |
ba74ec7f RV |
422 | pm_generic_runtime_idle |
423 | ) | |
424 | }; | |
425 | ||
426 | #define AMBA_PM (&amba_pm) | |
427 | ||
428 | #else /* !CONFIG_PM */ | |
429 | ||
430 | #define AMBA_PM NULL | |
431 | ||
432 | #endif /* !CONFIG_PM */ | |
433 | ||
1da177e4 LT |
434 | /* |
435 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
436 | * so we call the bus "amba". | |
437 | */ | |
394d5aef | 438 | struct bus_type amba_bustype = { |
1da177e4 | 439 | .name = "amba", |
96b13f5c | 440 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 441 | .match = amba_match, |
6d20b035 | 442 | .uevent = amba_uevent, |
ba74ec7f | 443 | .pm = AMBA_PM, |
1da177e4 LT |
444 | }; |
445 | ||
446 | static int __init amba_init(void) | |
447 | { | |
448 | return bus_register(&amba_bustype); | |
449 | } | |
450 | ||
451 | postcore_initcall(amba_init); | |
452 | ||
7cfe2494 RK |
453 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
454 | { | |
455 | struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk"); | |
456 | int ret; | |
457 | ||
458 | pcdev->pclk = pclk; | |
459 | ||
460 | if (IS_ERR(pclk)) | |
461 | return PTR_ERR(pclk); | |
462 | ||
ac3e2fa6 RK |
463 | ret = clk_prepare(pclk); |
464 | if (ret) { | |
465 | clk_put(pclk); | |
466 | return ret; | |
467 | } | |
468 | ||
7cfe2494 | 469 | ret = clk_enable(pclk); |
ac3e2fa6 RK |
470 | if (ret) { |
471 | clk_unprepare(pclk); | |
7cfe2494 | 472 | clk_put(pclk); |
ac3e2fa6 | 473 | } |
7cfe2494 RK |
474 | |
475 | return ret; | |
476 | } | |
477 | ||
478 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
479 | { | |
480 | struct clk *pclk = pcdev->pclk; | |
481 | ||
482 | clk_disable(pclk); | |
ac3e2fa6 | 483 | clk_unprepare(pclk); |
7cfe2494 RK |
484 | clk_put(pclk); |
485 | } | |
486 | ||
65500fa9 LW |
487 | static int amba_get_enable_vcore(struct amba_device *pcdev) |
488 | { | |
489 | struct regulator *vcore = regulator_get(&pcdev->dev, "vcore"); | |
490 | int ret; | |
491 | ||
492 | pcdev->vcore = vcore; | |
493 | ||
494 | if (IS_ERR(vcore)) { | |
495 | /* It is OK not to supply a vcore regulator */ | |
496 | if (PTR_ERR(vcore) == -ENODEV) | |
497 | return 0; | |
498 | return PTR_ERR(vcore); | |
499 | } | |
500 | ||
501 | ret = regulator_enable(vcore); | |
502 | if (ret) { | |
503 | regulator_put(vcore); | |
504 | pcdev->vcore = ERR_PTR(-ENODEV); | |
505 | } | |
506 | ||
507 | return ret; | |
508 | } | |
509 | ||
510 | static void amba_put_disable_vcore(struct amba_device *pcdev) | |
511 | { | |
512 | struct regulator *vcore = pcdev->vcore; | |
513 | ||
514 | if (!IS_ERR(vcore)) { | |
515 | regulator_disable(vcore); | |
516 | regulator_put(vcore); | |
517 | } | |
518 | } | |
519 | ||
1da177e4 LT |
520 | /* |
521 | * These are the device model conversion veneers; they convert the | |
522 | * device model structures to our more specific structures. | |
523 | */ | |
524 | static int amba_probe(struct device *dev) | |
525 | { | |
526 | struct amba_device *pcdev = to_amba_device(dev); | |
527 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 528 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 529 | int ret; |
1da177e4 | 530 | |
7cfe2494 | 531 | do { |
65500fa9 LW |
532 | ret = amba_get_enable_vcore(pcdev); |
533 | if (ret) | |
534 | break; | |
535 | ||
7cfe2494 RK |
536 | ret = amba_get_enable_pclk(pcdev); |
537 | if (ret) | |
538 | break; | |
539 | ||
92b97f0a RK |
540 | pm_runtime_get_noresume(dev); |
541 | pm_runtime_set_active(dev); | |
542 | pm_runtime_enable(dev); | |
543 | ||
7cfe2494 RK |
544 | ret = pcdrv->probe(pcdev, id); |
545 | if (ret == 0) | |
546 | break; | |
1da177e4 | 547 | |
92b97f0a RK |
548 | pm_runtime_disable(dev); |
549 | pm_runtime_set_suspended(dev); | |
550 | pm_runtime_put_noidle(dev); | |
551 | ||
7cfe2494 | 552 | amba_put_disable_pclk(pcdev); |
65500fa9 | 553 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
554 | } while (0); |
555 | ||
556 | return ret; | |
1da177e4 LT |
557 | } |
558 | ||
559 | static int amba_remove(struct device *dev) | |
560 | { | |
7cfe2494 | 561 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 562 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
563 | int ret; |
564 | ||
565 | pm_runtime_get_sync(dev); | |
566 | ret = drv->remove(pcdev); | |
567 | pm_runtime_put_noidle(dev); | |
568 | ||
569 | /* Undo the runtime PM settings in amba_probe() */ | |
570 | pm_runtime_disable(dev); | |
571 | pm_runtime_set_suspended(dev); | |
572 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
573 | |
574 | amba_put_disable_pclk(pcdev); | |
65500fa9 | 575 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
576 | |
577 | return ret; | |
1da177e4 LT |
578 | } |
579 | ||
580 | static void amba_shutdown(struct device *dev) | |
581 | { | |
582 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
583 | drv->shutdown(to_amba_device(dev)); | |
584 | } | |
585 | ||
586 | /** | |
587 | * amba_driver_register - register an AMBA device driver | |
588 | * @drv: amba device driver structure | |
589 | * | |
590 | * Register an AMBA device driver with the Linux device model | |
591 | * core. If devices pre-exist, the drivers probe function will | |
592 | * be called. | |
593 | */ | |
594 | int amba_driver_register(struct amba_driver *drv) | |
595 | { | |
596 | drv->drv.bus = &amba_bustype; | |
597 | ||
598 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
599 | SETFN(probe); | |
600 | SETFN(remove); | |
601 | SETFN(shutdown); | |
602 | ||
603 | return driver_register(&drv->drv); | |
604 | } | |
605 | ||
606 | /** | |
607 | * amba_driver_unregister - remove an AMBA device driver | |
608 | * @drv: AMBA device driver structure to remove | |
609 | * | |
610 | * Unregister an AMBA device driver from the Linux device | |
611 | * model. The device model will call the drivers remove function | |
612 | * for each device the device driver is currently handling. | |
613 | */ | |
614 | void amba_driver_unregister(struct amba_driver *drv) | |
615 | { | |
616 | driver_unregister(&drv->drv); | |
617 | } | |
618 | ||
619 | ||
620 | static void amba_device_release(struct device *dev) | |
621 | { | |
622 | struct amba_device *d = to_amba_device(dev); | |
623 | ||
624 | if (d->res.parent) | |
625 | release_resource(&d->res); | |
626 | kfree(d); | |
627 | } | |
628 | ||
1da177e4 LT |
629 | /** |
630 | * amba_device_register - register an AMBA device | |
631 | * @dev: AMBA device to register | |
632 | * @parent: parent memory resource | |
633 | * | |
634 | * Setup the AMBA device, reading the cell ID if present. | |
635 | * Claim the resource, and register the AMBA device with | |
636 | * the Linux device manager. | |
637 | */ | |
638 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
639 | { | |
8afe0b96 | 640 | u32 size; |
1da177e4 LT |
641 | void __iomem *tmp; |
642 | int i, ret; | |
643 | ||
557dca5f RK |
644 | device_initialize(&dev->dev); |
645 | ||
646 | /* | |
647 | * Copy from device_add | |
648 | */ | |
649 | if (dev->dev.init_name) { | |
650 | dev_set_name(&dev->dev, "%s", dev->dev.init_name); | |
651 | dev->dev.init_name = NULL; | |
652 | } | |
653 | ||
1da177e4 LT |
654 | dev->dev.release = amba_device_release; |
655 | dev->dev.bus = &amba_bustype; | |
656 | dev->dev.dma_mask = &dev->dma_mask; | |
9d6b4c82 | 657 | dev->res.name = dev_name(&dev->dev); |
1da177e4 LT |
658 | |
659 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
660 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
661 | ||
662 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
663 | if (ret) |
664 | goto err_out; | |
665 | ||
97ceed1f LW |
666 | /* Hard-coded primecell ID instead of plug-n-play */ |
667 | if (dev->periphid != 0) | |
668 | goto skip_probe; | |
669 | ||
8afe0b96 LC |
670 | /* |
671 | * Dynamically calculate the size of the resource | |
672 | * and use this for iomap | |
673 | */ | |
674 | size = resource_size(&dev->res); | |
675 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
676 | if (!tmp) { |
677 | ret = -ENOMEM; | |
678 | goto err_release; | |
1da177e4 | 679 | } |
96b13f5c | 680 | |
7cfe2494 RK |
681 | ret = amba_get_enable_pclk(dev); |
682 | if (ret == 0) { | |
683 | u32 pid, cid; | |
96b13f5c | 684 | |
7cfe2494 RK |
685 | /* |
686 | * Read pid and cid based on size of resource | |
687 | * they are located at end of region | |
688 | */ | |
689 | for (pid = 0, i = 0; i < 4; i++) | |
690 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
691 | (i * 8); | |
692 | for (cid = 0, i = 0; i < 4; i++) | |
693 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
694 | (i * 8); | |
96b13f5c | 695 | |
7cfe2494 | 696 | amba_put_disable_pclk(dev); |
96b13f5c | 697 | |
01723a95 | 698 | if (cid == AMBA_CID) |
7cfe2494 RK |
699 | dev->periphid = pid; |
700 | ||
701 | if (!dev->periphid) | |
702 | ret = -ENODEV; | |
96b13f5c RK |
703 | } |
704 | ||
7cfe2494 RK |
705 | iounmap(tmp); |
706 | ||
707 | if (ret) | |
708 | goto err_release; | |
709 | ||
97ceed1f | 710 | skip_probe: |
557dca5f | 711 | ret = device_add(&dev->dev); |
96b13f5c RK |
712 | if (ret) |
713 | goto err_release; | |
714 | ||
715 | if (dev->irq[0] != NO_IRQ) | |
716 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
717 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
718 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
719 | if (ret == 0) | |
720 | return ret; | |
721 | ||
722 | device_unregister(&dev->dev); | |
723 | ||
724 | err_release: | |
725 | release_resource(&dev->res); | |
726 | err_out: | |
1da177e4 LT |
727 | return ret; |
728 | } | |
729 | ||
730 | /** | |
731 | * amba_device_unregister - unregister an AMBA device | |
732 | * @dev: AMBA device to remove | |
733 | * | |
734 | * Remove the specified AMBA device from the Linux device | |
735 | * manager. All files associated with this object will be | |
736 | * destroyed, and device drivers notified that the device has | |
737 | * been removed. The AMBA device's resources including | |
738 | * the amba_device structure will be freed once all | |
739 | * references to it have been dropped. | |
740 | */ | |
741 | void amba_device_unregister(struct amba_device *dev) | |
742 | { | |
743 | device_unregister(&dev->dev); | |
744 | } | |
745 | ||
746 | ||
747 | struct find_data { | |
748 | struct amba_device *dev; | |
749 | struct device *parent; | |
750 | const char *busid; | |
751 | unsigned int id; | |
752 | unsigned int mask; | |
753 | }; | |
754 | ||
755 | static int amba_find_match(struct device *dev, void *data) | |
756 | { | |
757 | struct find_data *d = data; | |
758 | struct amba_device *pcdev = to_amba_device(dev); | |
759 | int r; | |
760 | ||
761 | r = (pcdev->periphid & d->mask) == d->id; | |
762 | if (d->parent) | |
763 | r &= d->parent == dev->parent; | |
764 | if (d->busid) | |
9d6b4c82 | 765 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
766 | |
767 | if (r) { | |
768 | get_device(dev); | |
769 | d->dev = pcdev; | |
770 | } | |
771 | ||
772 | return r; | |
773 | } | |
774 | ||
775 | /** | |
776 | * amba_find_device - locate an AMBA device given a bus id | |
777 | * @busid: bus id for device (or NULL) | |
778 | * @parent: parent device (or NULL) | |
779 | * @id: peripheral ID (or 0) | |
780 | * @mask: peripheral ID mask (or 0) | |
781 | * | |
782 | * Return the AMBA device corresponding to the supplied parameters. | |
783 | * If no device matches, returns NULL. | |
784 | * | |
785 | * NOTE: When a valid device is found, its refcount is | |
786 | * incremented, and must be decremented before the returned | |
787 | * reference. | |
788 | */ | |
789 | struct amba_device * | |
790 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
791 | unsigned int mask) | |
792 | { | |
793 | struct find_data data; | |
794 | ||
795 | data.dev = NULL; | |
796 | data.parent = parent; | |
797 | data.busid = busid; | |
798 | data.id = id; | |
799 | data.mask = mask; | |
800 | ||
801 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
802 | ||
803 | return data.dev; | |
804 | } | |
805 | ||
806 | /** | |
807 | * amba_request_regions - request all mem regions associated with device | |
808 | * @dev: amba_device structure for device | |
809 | * @name: name, or NULL to use driver name | |
810 | */ | |
811 | int amba_request_regions(struct amba_device *dev, const char *name) | |
812 | { | |
813 | int ret = 0; | |
8afe0b96 | 814 | u32 size; |
1da177e4 LT |
815 | |
816 | if (!name) | |
817 | name = dev->dev.driver->name; | |
818 | ||
8afe0b96 LC |
819 | size = resource_size(&dev->res); |
820 | ||
821 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
822 | ret = -EBUSY; |
823 | ||
824 | return ret; | |
825 | } | |
826 | ||
827 | /** | |
25985edc | 828 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
829 | * @dev: amba_device structure for device |
830 | * | |
831 | * Release regions claimed by a successful call to amba_request_regions. | |
832 | */ | |
833 | void amba_release_regions(struct amba_device *dev) | |
834 | { | |
8afe0b96 LC |
835 | u32 size; |
836 | ||
837 | size = resource_size(&dev->res); | |
838 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
839 | } |
840 | ||
841 | EXPORT_SYMBOL(amba_driver_register); | |
842 | EXPORT_SYMBOL(amba_driver_unregister); | |
843 | EXPORT_SYMBOL(amba_device_register); | |
844 | EXPORT_SYMBOL(amba_device_unregister); | |
845 | EXPORT_SYMBOL(amba_find_device); | |
846 | EXPORT_SYMBOL(amba_request_regions); | |
847 | EXPORT_SYMBOL(amba_release_regions); |