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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> |
13 | #include <linux/string.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/io.h> |
16 | #include <linux/pm.h> |
17 | #include <linux/pm_runtime.h> |
18 | #include <linux/amba/bus.h> |
19 | #include <linux/sizes.h> |
20 | |
21 | #include <asm/irq.h> |
22 | |
23 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
24 | |
25 | static const struct amba_id * |
26 | amba_lookup(const struct amba_id *table, struct amba_device *dev) |
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 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
49 | { |
50 | struct amba_device *pcdev = to_amba_device(dev); |
51 | int retval = 0; |
52 | |
53 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
54 | if (retval) |
55 | return retval; |
56 | |
57 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); |
58 | return retval; |
59 | } |
60 | |
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 | |
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 | #endif /* CONFIG_PM_SLEEP */ |
113 | |
114 | #ifdef CONFIG_SUSPEND |
115 | |
116 | static int amba_pm_suspend(struct device *dev) |
117 | { |
118 | struct device_driver *drv = dev->driver; |
119 | int ret = 0; |
120 | |
121 | if (!drv) |
122 | return 0; |
123 | |
124 | if (drv->pm) { |
125 | if (drv->pm->suspend) |
126 | ret = drv->pm->suspend(dev); |
127 | } else { |
128 | ret = amba_legacy_suspend(dev, PMSG_SUSPEND); |
129 | } |
130 | |
131 | return ret; |
132 | } |
133 | |
134 | static int amba_pm_resume(struct device *dev) |
135 | { |
136 | struct device_driver *drv = dev->driver; |
137 | int ret = 0; |
138 | |
139 | if (!drv) |
140 | return 0; |
141 | |
142 | if (drv->pm) { |
143 | if (drv->pm->resume) |
144 | ret = drv->pm->resume(dev); |
145 | } else { |
146 | ret = amba_legacy_resume(dev); |
147 | } |
148 | |
149 | return ret; |
150 | } |
151 | |
152 | #else /* !CONFIG_SUSPEND */ |
153 | |
154 | #define amba_pm_suspend NULL |
155 | #define amba_pm_resume NULL |
156 | |
157 | #endif /* !CONFIG_SUSPEND */ |
158 | |
159 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
160 | |
161 | static int amba_pm_freeze(struct device *dev) |
162 | { |
163 | struct device_driver *drv = dev->driver; |
164 | int ret = 0; |
165 | |
166 | if (!drv) |
167 | return 0; |
168 | |
169 | if (drv->pm) { |
170 | if (drv->pm->freeze) |
171 | ret = drv->pm->freeze(dev); |
172 | } else { |
173 | ret = amba_legacy_suspend(dev, PMSG_FREEZE); |
174 | } |
175 | |
176 | return ret; |
177 | } |
178 | |
179 | static int amba_pm_thaw(struct device *dev) |
180 | { |
181 | struct device_driver *drv = dev->driver; |
182 | int ret = 0; |
183 | |
184 | if (!drv) |
185 | return 0; |
186 | |
187 | if (drv->pm) { |
188 | if (drv->pm->thaw) |
189 | ret = drv->pm->thaw(dev); |
190 | } else { |
191 | ret = amba_legacy_resume(dev); |
192 | } |
193 | |
194 | return ret; |
195 | } |
196 | |
197 | static int amba_pm_poweroff(struct device *dev) |
198 | { |
199 | struct device_driver *drv = dev->driver; |
200 | int ret = 0; |
201 | |
202 | if (!drv) |
203 | return 0; |
204 | |
205 | if (drv->pm) { |
206 | if (drv->pm->poweroff) |
207 | ret = drv->pm->poweroff(dev); |
208 | } else { |
209 | ret = amba_legacy_suspend(dev, PMSG_HIBERNATE); |
210 | } |
211 | |
212 | return ret; |
213 | } |
214 | |
215 | static int amba_pm_restore(struct device *dev) |
216 | { |
217 | struct device_driver *drv = dev->driver; |
218 | int ret = 0; |
219 | |
220 | if (!drv) |
221 | return 0; |
222 | |
223 | if (drv->pm) { |
224 | if (drv->pm->restore) |
225 | ret = drv->pm->restore(dev); |
226 | } else { |
227 | ret = amba_legacy_resume(dev); |
228 | } |
229 | |
230 | return ret; |
231 | } |
232 | |
233 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
234 | |
235 | #define amba_pm_freeze NULL |
236 | #define amba_pm_thaw NULL |
237 | #define amba_pm_poweroff NULL |
238 | #define amba_pm_restore NULL |
239 | |
240 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
241 | |
242 | #ifdef CONFIG_PM_RUNTIME |
243 | /* |
244 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to |
245 | * enable/disable the bus clock at runtime PM suspend/resume as this |
246 | * does not result in loss of context. |
247 | */ |
248 | static int amba_pm_runtime_suspend(struct device *dev) |
249 | { |
250 | struct amba_device *pcdev = to_amba_device(dev); |
251 | int ret = pm_generic_runtime_suspend(dev); |
252 | |
253 | if (ret == 0 && dev->driver) |
254 | clk_disable(pcdev->pclk); |
255 | |
256 | return ret; |
257 | } |
258 | |
259 | static int amba_pm_runtime_resume(struct device *dev) |
260 | { |
261 | struct amba_device *pcdev = to_amba_device(dev); |
262 | int ret; |
263 | |
264 | if (dev->driver) { |
265 | ret = clk_enable(pcdev->pclk); |
266 | /* Failure is probably fatal to the system, but... */ |
267 | if (ret) |
268 | return ret; |
269 | } |
270 | |
271 | return pm_generic_runtime_resume(dev); |
272 | } |
273 | #endif |
274 | |
275 | #ifdef CONFIG_PM |
276 | |
277 | static const struct dev_pm_ops amba_pm = { |
278 | .suspend = amba_pm_suspend, |
279 | .resume = amba_pm_resume, |
280 | .freeze = amba_pm_freeze, |
281 | .thaw = amba_pm_thaw, |
282 | .poweroff = amba_pm_poweroff, |
283 | .restore = amba_pm_restore, |
284 | SET_RUNTIME_PM_OPS( |
285 | amba_pm_runtime_suspend, |
286 | amba_pm_runtime_resume, |
287 | pm_generic_runtime_idle |
288 | ) |
289 | }; |
290 | |
291 | #define AMBA_PM (&amba_pm) |
292 | |
293 | #else /* !CONFIG_PM */ |
294 | |
295 | #define AMBA_PM NULL |
296 | |
297 | #endif /* !CONFIG_PM */ |
298 | |
299 | /* |
300 | * Primecells are part of the Advanced Microcontroller Bus Architecture, |
301 | * so we call the bus "amba". |
302 | */ |
303 | struct bus_type amba_bustype = { |
304 | .name = "amba", |
305 | .dev_attrs = amba_dev_attrs, |
306 | .match = amba_match, |
307 | .uevent = amba_uevent, |
308 | .pm = AMBA_PM, |
309 | }; |
310 | |
311 | static int __init amba_init(void) |
312 | { |
313 | return bus_register(&amba_bustype); |
314 | } |
315 | |
316 | postcore_initcall(amba_init); |
317 | |
318 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
319 | { |
320 | struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk"); |
321 | int ret; |
322 | |
323 | pcdev->pclk = pclk; |
324 | |
325 | if (IS_ERR(pclk)) |
326 | return PTR_ERR(pclk); |
327 | |
328 | ret = clk_prepare(pclk); |
329 | if (ret) { |
330 | clk_put(pclk); |
331 | return ret; |
332 | } |
333 | |
334 | ret = clk_enable(pclk); |
335 | if (ret) { |
336 | clk_unprepare(pclk); |
337 | clk_put(pclk); |
338 | } |
339 | |
340 | return ret; |
341 | } |
342 | |
343 | static void amba_put_disable_pclk(struct amba_device *pcdev) |
344 | { |
345 | struct clk *pclk = pcdev->pclk; |
346 | |
347 | clk_disable(pclk); |
348 | clk_unprepare(pclk); |
349 | clk_put(pclk); |
350 | } |
351 | |
352 | /* |
353 | * These are the device model conversion veneers; they convert the |
354 | * device model structures to our more specific structures. |
355 | */ |
356 | static int amba_probe(struct device *dev) |
357 | { |
358 | struct amba_device *pcdev = to_amba_device(dev); |
359 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); |
360 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
361 | int ret; |
362 | |
363 | do { |
364 | ret = amba_get_enable_pclk(pcdev); |
365 | if (ret) |
366 | break; |
367 | |
368 | pm_runtime_get_noresume(dev); |
369 | pm_runtime_set_active(dev); |
370 | pm_runtime_enable(dev); |
371 | |
372 | ret = pcdrv->probe(pcdev, id); |
373 | if (ret == 0) |
374 | break; |
375 | |
376 | pm_runtime_disable(dev); |
377 | pm_runtime_set_suspended(dev); |
378 | pm_runtime_put_noidle(dev); |
379 | |
380 | amba_put_disable_pclk(pcdev); |
381 | } while (0); |
382 | |
383 | return ret; |
384 | } |
385 | |
386 | static int amba_remove(struct device *dev) |
387 | { |
388 | struct amba_device *pcdev = to_amba_device(dev); |
389 | struct amba_driver *drv = to_amba_driver(dev->driver); |
390 | int ret; |
391 | |
392 | pm_runtime_get_sync(dev); |
393 | ret = drv->remove(pcdev); |
394 | pm_runtime_put_noidle(dev); |
395 | |
396 | /* Undo the runtime PM settings in amba_probe() */ |
397 | pm_runtime_disable(dev); |
398 | pm_runtime_set_suspended(dev); |
399 | pm_runtime_put_noidle(dev); |
400 | |
401 | amba_put_disable_pclk(pcdev); |
402 | |
403 | return ret; |
404 | } |
405 | |
406 | static void amba_shutdown(struct device *dev) |
407 | { |
408 | struct amba_driver *drv = to_amba_driver(dev->driver); |
409 | drv->shutdown(to_amba_device(dev)); |
410 | } |
411 | |
412 | /** |
413 | * amba_driver_register - register an AMBA device driver |
414 | * @drv: amba device driver structure |
415 | * |
416 | * Register an AMBA device driver with the Linux device model |
417 | * core. If devices pre-exist, the drivers probe function will |
418 | * be called. |
419 | */ |
420 | int amba_driver_register(struct amba_driver *drv) |
421 | { |
422 | drv->drv.bus = &amba_bustype; |
423 | |
424 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn |
425 | SETFN(probe); |
426 | SETFN(remove); |
427 | SETFN(shutdown); |
428 | |
429 | return driver_register(&drv->drv); |
430 | } |
431 | |
432 | /** |
433 | * amba_driver_unregister - remove an AMBA device driver |
434 | * @drv: AMBA device driver structure to remove |
435 | * |
436 | * Unregister an AMBA device driver from the Linux device |
437 | * model. The device model will call the drivers remove function |
438 | * for each device the device driver is currently handling. |
439 | */ |
440 | void amba_driver_unregister(struct amba_driver *drv) |
441 | { |
442 | driver_unregister(&drv->drv); |
443 | } |
444 | |
445 | |
446 | static void amba_device_release(struct device *dev) |
447 | { |
448 | struct amba_device *d = to_amba_device(dev); |
449 | |
450 | if (d->res.parent) |
451 | release_resource(&d->res); |
452 | kfree(d); |
453 | } |
454 | |
455 | /** |
456 | * amba_device_add - add a previously allocated AMBA device structure |
457 | * @dev: AMBA device allocated by amba_device_alloc |
458 | * @parent: resource parent for this devices resources |
459 | * |
460 | * Claim the resource, and read the device cell ID if not already |
461 | * initialized. Register the AMBA device with the Linux device |
462 | * manager. |
463 | */ |
464 | int amba_device_add(struct amba_device *dev, struct resource *parent) |
465 | { |
466 | u32 size; |
467 | void __iomem *tmp; |
468 | int i, ret; |
469 | |
470 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
471 | WARN_ON(dev->irq[1] == (unsigned int)-1); |
472 | |
473 | ret = request_resource(parent, &dev->res); |
474 | if (ret) |
475 | goto err_out; |
476 | |
477 | /* Hard-coded primecell ID instead of plug-n-play */ |
478 | if (dev->periphid != 0) |
479 | goto skip_probe; |
480 | |
481 | /* |
482 | * Dynamically calculate the size of the resource |
483 | * and use this for iomap |
484 | */ |
485 | size = resource_size(&dev->res); |
486 | tmp = ioremap(dev->res.start, size); |
487 | if (!tmp) { |
488 | ret = -ENOMEM; |
489 | goto err_release; |
490 | } |
491 | |
492 | ret = amba_get_enable_pclk(dev); |
493 | if (ret == 0) { |
494 | u32 pid, cid; |
495 | |
496 | /* |
497 | * Read pid and cid based on size of resource |
498 | * they are located at end of region |
499 | */ |
500 | for (pid = 0, i = 0; i < 4; i++) |
501 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << |
502 | (i * 8); |
503 | for (cid = 0, i = 0; i < 4; i++) |
504 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << |
505 | (i * 8); |
506 | |
507 | amba_put_disable_pclk(dev); |
508 | |
509 | if (cid == AMBA_CID) |
510 | dev->periphid = pid; |
511 | |
512 | if (!dev->periphid) |
513 | ret = -ENODEV; |
514 | } |
515 | |
516 | iounmap(tmp); |
517 | |
518 | if (ret) |
519 | goto err_release; |
520 | |
521 | skip_probe: |
522 | ret = device_add(&dev->dev); |
523 | if (ret) |
524 | goto err_release; |
525 | |
526 | if (dev->irq[0]) |
527 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
528 | if (ret == 0 && dev->irq[1]) |
529 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
530 | if (ret == 0) |
531 | return ret; |
532 | |
533 | device_unregister(&dev->dev); |
534 | |
535 | err_release: |
536 | release_resource(&dev->res); |
537 | err_out: |
538 | return ret; |
539 | } |
540 | EXPORT_SYMBOL_GPL(amba_device_add); |
541 | |
542 | static struct amba_device * |
543 | amba_aphb_device_add(struct device *parent, const char *name, |
544 | resource_size_t base, size_t size, int irq1, int irq2, |
545 | void *pdata, unsigned int periphid, u64 dma_mask, |
546 | struct resource *resbase) |
547 | { |
548 | struct amba_device *dev; |
549 | int ret; |
550 | |
551 | dev = amba_device_alloc(name, base, size); |
552 | if (!dev) |
553 | return ERR_PTR(-ENOMEM); |
554 | |
555 | dev->dma_mask = dma_mask; |
556 | dev->dev.coherent_dma_mask = dma_mask; |
557 | dev->irq[0] = irq1; |
558 | dev->irq[1] = irq2; |
559 | dev->periphid = periphid; |
560 | dev->dev.platform_data = pdata; |
561 | dev->dev.parent = parent; |
562 | |
563 | ret = amba_device_add(dev, resbase); |
564 | if (ret) { |
565 | amba_device_put(dev); |
566 | return ERR_PTR(ret); |
567 | } |
568 | |
569 | return dev; |
570 | } |
571 | |
572 | struct amba_device * |
573 | amba_apb_device_add(struct device *parent, const char *name, |
574 | resource_size_t base, size_t size, int irq1, int irq2, |
575 | void *pdata, unsigned int periphid) |
576 | { |
577 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
578 | periphid, 0, &iomem_resource); |
579 | } |
580 | EXPORT_SYMBOL_GPL(amba_apb_device_add); |
581 | |
582 | struct amba_device * |
583 | amba_ahb_device_add(struct device *parent, const char *name, |
584 | resource_size_t base, size_t size, int irq1, int irq2, |
585 | void *pdata, unsigned int periphid) |
586 | { |
587 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
588 | periphid, ~0ULL, &iomem_resource); |
589 | } |
590 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); |
591 | |
592 | struct amba_device * |
593 | amba_apb_device_add_res(struct device *parent, const char *name, |
594 | resource_size_t base, size_t size, int irq1, |
595 | int irq2, void *pdata, unsigned int periphid, |
596 | struct resource *resbase) |
597 | { |
598 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
599 | periphid, 0, resbase); |
600 | } |
601 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); |
602 | |
603 | struct amba_device * |
604 | amba_ahb_device_add_res(struct device *parent, const char *name, |
605 | resource_size_t base, size_t size, int irq1, |
606 | int irq2, void *pdata, unsigned int periphid, |
607 | struct resource *resbase) |
608 | { |
609 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
610 | periphid, ~0ULL, resbase); |
611 | } |
612 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); |
613 | |
614 | |
615 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
616 | { |
617 | device_initialize(&dev->dev); |
618 | if (name) |
619 | dev_set_name(&dev->dev, "%s", name); |
620 | dev->dev.release = amba_device_release; |
621 | dev->dev.bus = &amba_bustype; |
622 | dev->dev.dma_mask = &dev->dma_mask; |
623 | dev->res.name = dev_name(&dev->dev); |
624 | } |
625 | |
626 | /** |
627 | * amba_device_alloc - allocate an AMBA device |
628 | * @name: sysfs name of the AMBA device |
629 | * @base: base of AMBA device |
630 | * @size: size of AMBA device |
631 | * |
632 | * Allocate and initialize an AMBA device structure. Returns %NULL |
633 | * on failure. |
634 | */ |
635 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, |
636 | size_t size) |
637 | { |
638 | struct amba_device *dev; |
639 | |
640 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
641 | if (dev) { |
642 | amba_device_initialize(dev, name); |
643 | dev->res.start = base; |
644 | dev->res.end = base + size - 1; |
645 | dev->res.flags = IORESOURCE_MEM; |
646 | } |
647 | |
648 | return dev; |
649 | } |
650 | EXPORT_SYMBOL_GPL(amba_device_alloc); |
651 | |
652 | /** |
653 | * amba_device_register - register an AMBA device |
654 | * @dev: AMBA device to register |
655 | * @parent: parent memory resource |
656 | * |
657 | * Setup the AMBA device, reading the cell ID if present. |
658 | * Claim the resource, and register the AMBA device with |
659 | * the Linux device manager. |
660 | */ |
661 | int amba_device_register(struct amba_device *dev, struct resource *parent) |
662 | { |
663 | amba_device_initialize(dev, dev->dev.init_name); |
664 | dev->dev.init_name = NULL; |
665 | |
666 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) |
667 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); |
668 | |
669 | return amba_device_add(dev, parent); |
670 | } |
671 | |
672 | /** |
673 | * amba_device_put - put an AMBA device |
674 | * @dev: AMBA device to put |
675 | */ |
676 | void amba_device_put(struct amba_device *dev) |
677 | { |
678 | put_device(&dev->dev); |
679 | } |
680 | EXPORT_SYMBOL_GPL(amba_device_put); |
681 | |
682 | /** |
683 | * amba_device_unregister - unregister an AMBA device |
684 | * @dev: AMBA device to remove |
685 | * |
686 | * Remove the specified AMBA device from the Linux device |
687 | * manager. All files associated with this object will be |
688 | * destroyed, and device drivers notified that the device has |
689 | * been removed. The AMBA device's resources including |
690 | * the amba_device structure will be freed once all |
691 | * references to it have been dropped. |
692 | */ |
693 | void amba_device_unregister(struct amba_device *dev) |
694 | { |
695 | device_unregister(&dev->dev); |
696 | } |
697 | |
698 | |
699 | struct find_data { |
700 | struct amba_device *dev; |
701 | struct device *parent; |
702 | const char *busid; |
703 | unsigned int id; |
704 | unsigned int mask; |
705 | }; |
706 | |
707 | static int amba_find_match(struct device *dev, void *data) |
708 | { |
709 | struct find_data *d = data; |
710 | struct amba_device *pcdev = to_amba_device(dev); |
711 | int r; |
712 | |
713 | r = (pcdev->periphid & d->mask) == d->id; |
714 | if (d->parent) |
715 | r &= d->parent == dev->parent; |
716 | if (d->busid) |
717 | r &= strcmp(dev_name(dev), d->busid) == 0; |
718 | |
719 | if (r) { |
720 | get_device(dev); |
721 | d->dev = pcdev; |
722 | } |
723 | |
724 | return r; |
725 | } |
726 | |
727 | /** |
728 | * amba_find_device - locate an AMBA device given a bus id |
729 | * @busid: bus id for device (or NULL) |
730 | * @parent: parent device (or NULL) |
731 | * @id: peripheral ID (or 0) |
732 | * @mask: peripheral ID mask (or 0) |
733 | * |
734 | * Return the AMBA device corresponding to the supplied parameters. |
735 | * If no device matches, returns NULL. |
736 | * |
737 | * NOTE: When a valid device is found, its refcount is |
738 | * incremented, and must be decremented before the returned |
739 | * reference. |
740 | */ |
741 | struct amba_device * |
742 | amba_find_device(const char *busid, struct device *parent, unsigned int id, |
743 | unsigned int mask) |
744 | { |
745 | struct find_data data; |
746 | |
747 | data.dev = NULL; |
748 | data.parent = parent; |
749 | data.busid = busid; |
750 | data.id = id; |
751 | data.mask = mask; |
752 | |
753 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); |
754 | |
755 | return data.dev; |
756 | } |
757 | |
758 | /** |
759 | * amba_request_regions - request all mem regions associated with device |
760 | * @dev: amba_device structure for device |
761 | * @name: name, or NULL to use driver name |
762 | */ |
763 | int amba_request_regions(struct amba_device *dev, const char *name) |
764 | { |
765 | int ret = 0; |
766 | u32 size; |
767 | |
768 | if (!name) |
769 | name = dev->dev.driver->name; |
770 | |
771 | size = resource_size(&dev->res); |
772 | |
773 | if (!request_mem_region(dev->res.start, size, name)) |
774 | ret = -EBUSY; |
775 | |
776 | return ret; |
777 | } |
778 | |
779 | /** |
780 | * amba_release_regions - release mem regions associated with device |
781 | * @dev: amba_device structure for device |
782 | * |
783 | * Release regions claimed by a successful call to amba_request_regions. |
784 | */ |
785 | void amba_release_regions(struct amba_device *dev) |
786 | { |
787 | u32 size; |
788 | |
789 | size = resource_size(&dev->res); |
790 | release_mem_region(dev->res.start, size); |
791 | } |
792 | |
793 | EXPORT_SYMBOL(amba_driver_register); |
794 | EXPORT_SYMBOL(amba_driver_unregister); |
795 | EXPORT_SYMBOL(amba_device_register); |
796 | EXPORT_SYMBOL(amba_device_unregister); |
797 | EXPORT_SYMBOL(amba_find_device); |
798 | EXPORT_SYMBOL(amba_request_regions); |
799 | EXPORT_SYMBOL(amba_release_regions); |
800 |
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