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3f23de10 SR |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4 | * and Arnd Bergmann, IBM Corp. | |
5 | * Merged from powerpc/kernel/of_platform.c and | |
6 | * sparc{,64}/kernel/of_device.c by Stephen Rothwell | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | #include <linux/errno.h> | |
5c457083 | 15 | #include <linux/module.h> |
3f23de10 | 16 | #include <linux/device.h> |
5fd200f3 | 17 | #include <linux/dma-mapping.h> |
3f23de10 SR |
18 | #include <linux/of_device.h> |
19 | #include <linux/of_platform.h> | |
20 | ||
140b932f OH |
21 | extern struct device_attribute of_platform_device_attrs[]; |
22 | ||
3f23de10 SR |
23 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) |
24 | { | |
597b9d1e | 25 | const struct of_device_id *matches = drv->of_match_table; |
3f23de10 SR |
26 | |
27 | if (!matches) | |
28 | return 0; | |
29 | ||
44504b2b | 30 | return of_match_device(matches, dev) != NULL; |
3f23de10 SR |
31 | } |
32 | ||
33 | static int of_platform_device_probe(struct device *dev) | |
34 | { | |
35 | int error = -ENODEV; | |
36 | struct of_platform_driver *drv; | |
37 | struct of_device *of_dev; | |
38 | const struct of_device_id *match; | |
39 | ||
40 | drv = to_of_platform_driver(dev->driver); | |
41 | of_dev = to_of_device(dev); | |
42 | ||
43 | if (!drv->probe) | |
44 | return error; | |
45 | ||
46 | of_dev_get(of_dev); | |
47 | ||
44504b2b | 48 | match = of_match_device(drv->driver.of_match_table, dev); |
3f23de10 SR |
49 | if (match) |
50 | error = drv->probe(of_dev, match); | |
51 | if (error) | |
52 | of_dev_put(of_dev); | |
53 | ||
54 | return error; | |
55 | } | |
56 | ||
57 | static int of_platform_device_remove(struct device *dev) | |
58 | { | |
59 | struct of_device *of_dev = to_of_device(dev); | |
60 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); | |
61 | ||
62 | if (dev->driver && drv->remove) | |
63 | drv->remove(of_dev); | |
64 | return 0; | |
65 | } | |
66 | ||
d35ef90b | 67 | static void of_platform_device_shutdown(struct device *dev) |
3f23de10 SR |
68 | { |
69 | struct of_device *of_dev = to_of_device(dev); | |
70 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); | |
3f23de10 | 71 | |
d35ef90b AV |
72 | if (dev->driver && drv->shutdown) |
73 | drv->shutdown(of_dev); | |
3f23de10 SR |
74 | } |
75 | ||
d35ef90b AV |
76 | #ifdef CONFIG_PM_SLEEP |
77 | ||
78 | static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
3f23de10 SR |
79 | { |
80 | struct of_device *of_dev = to_of_device(dev); | |
81 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); | |
d35ef90b | 82 | int ret = 0; |
3f23de10 | 83 | |
d35ef90b AV |
84 | if (dev->driver && drv->suspend) |
85 | ret = drv->suspend(of_dev, mesg); | |
86 | return ret; | |
3f23de10 SR |
87 | } |
88 | ||
d35ef90b | 89 | static int of_platform_legacy_resume(struct device *dev) |
a09ad3c4 ME |
90 | { |
91 | struct of_device *of_dev = to_of_device(dev); | |
92 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); | |
d35ef90b | 93 | int ret = 0; |
a09ad3c4 | 94 | |
d35ef90b AV |
95 | if (dev->driver && drv->resume) |
96 | ret = drv->resume(of_dev); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | static int of_platform_pm_prepare(struct device *dev) | |
101 | { | |
102 | struct device_driver *drv = dev->driver; | |
103 | int ret = 0; | |
104 | ||
105 | if (drv && drv->pm && drv->pm->prepare) | |
106 | ret = drv->pm->prepare(dev); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | static void of_platform_pm_complete(struct device *dev) | |
112 | { | |
113 | struct device_driver *drv = dev->driver; | |
114 | ||
115 | if (drv && drv->pm && drv->pm->complete) | |
116 | drv->pm->complete(dev); | |
117 | } | |
118 | ||
119 | #ifdef CONFIG_SUSPEND | |
120 | ||
121 | static int of_platform_pm_suspend(struct device *dev) | |
122 | { | |
123 | struct device_driver *drv = dev->driver; | |
124 | int ret = 0; | |
125 | ||
126 | if (!drv) | |
127 | return 0; | |
128 | ||
129 | if (drv->pm) { | |
130 | if (drv->pm->suspend) | |
131 | ret = drv->pm->suspend(dev); | |
132 | } else { | |
133 | ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND); | |
134 | } | |
135 | ||
136 | return ret; | |
a09ad3c4 ME |
137 | } |
138 | ||
d35ef90b AV |
139 | static int of_platform_pm_suspend_noirq(struct device *dev) |
140 | { | |
141 | struct device_driver *drv = dev->driver; | |
142 | int ret = 0; | |
143 | ||
144 | if (!drv) | |
145 | return 0; | |
146 | ||
147 | if (drv->pm) { | |
148 | if (drv->pm->suspend_noirq) | |
149 | ret = drv->pm->suspend_noirq(dev); | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | static int of_platform_pm_resume(struct device *dev) | |
156 | { | |
157 | struct device_driver *drv = dev->driver; | |
158 | int ret = 0; | |
159 | ||
160 | if (!drv) | |
161 | return 0; | |
162 | ||
163 | if (drv->pm) { | |
164 | if (drv->pm->resume) | |
165 | ret = drv->pm->resume(dev); | |
166 | } else { | |
167 | ret = of_platform_legacy_resume(dev); | |
168 | } | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
173 | static int of_platform_pm_resume_noirq(struct device *dev) | |
174 | { | |
175 | struct device_driver *drv = dev->driver; | |
176 | int ret = 0; | |
177 | ||
178 | if (!drv) | |
179 | return 0; | |
180 | ||
181 | if (drv->pm) { | |
182 | if (drv->pm->resume_noirq) | |
183 | ret = drv->pm->resume_noirq(dev); | |
184 | } | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | #else /* !CONFIG_SUSPEND */ | |
190 | ||
191 | #define of_platform_pm_suspend NULL | |
192 | #define of_platform_pm_resume NULL | |
193 | #define of_platform_pm_suspend_noirq NULL | |
194 | #define of_platform_pm_resume_noirq NULL | |
195 | ||
196 | #endif /* !CONFIG_SUSPEND */ | |
197 | ||
198 | #ifdef CONFIG_HIBERNATION | |
199 | ||
200 | static int of_platform_pm_freeze(struct device *dev) | |
201 | { | |
202 | struct device_driver *drv = dev->driver; | |
203 | int ret = 0; | |
204 | ||
205 | if (!drv) | |
206 | return 0; | |
207 | ||
208 | if (drv->pm) { | |
209 | if (drv->pm->freeze) | |
210 | ret = drv->pm->freeze(dev); | |
211 | } else { | |
212 | ret = of_platform_legacy_suspend(dev, PMSG_FREEZE); | |
213 | } | |
214 | ||
215 | return ret; | |
216 | } | |
217 | ||
218 | static int of_platform_pm_freeze_noirq(struct device *dev) | |
219 | { | |
220 | struct device_driver *drv = dev->driver; | |
221 | int ret = 0; | |
222 | ||
223 | if (!drv) | |
224 | return 0; | |
225 | ||
226 | if (drv->pm) { | |
227 | if (drv->pm->freeze_noirq) | |
228 | ret = drv->pm->freeze_noirq(dev); | |
229 | } | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
234 | static int of_platform_pm_thaw(struct device *dev) | |
235 | { | |
236 | struct device_driver *drv = dev->driver; | |
237 | int ret = 0; | |
238 | ||
239 | if (!drv) | |
240 | return 0; | |
241 | ||
242 | if (drv->pm) { | |
243 | if (drv->pm->thaw) | |
244 | ret = drv->pm->thaw(dev); | |
245 | } else { | |
246 | ret = of_platform_legacy_resume(dev); | |
247 | } | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | static int of_platform_pm_thaw_noirq(struct device *dev) | |
253 | { | |
254 | struct device_driver *drv = dev->driver; | |
255 | int ret = 0; | |
256 | ||
257 | if (!drv) | |
258 | return 0; | |
259 | ||
260 | if (drv->pm) { | |
261 | if (drv->pm->thaw_noirq) | |
262 | ret = drv->pm->thaw_noirq(dev); | |
263 | } | |
264 | ||
265 | return ret; | |
266 | } | |
267 | ||
268 | static int of_platform_pm_poweroff(struct device *dev) | |
269 | { | |
270 | struct device_driver *drv = dev->driver; | |
271 | int ret = 0; | |
272 | ||
273 | if (!drv) | |
274 | return 0; | |
275 | ||
276 | if (drv->pm) { | |
277 | if (drv->pm->poweroff) | |
278 | ret = drv->pm->poweroff(dev); | |
279 | } else { | |
280 | ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
281 | } | |
282 | ||
283 | return ret; | |
284 | } | |
285 | ||
286 | static int of_platform_pm_poweroff_noirq(struct device *dev) | |
287 | { | |
288 | struct device_driver *drv = dev->driver; | |
289 | int ret = 0; | |
290 | ||
291 | if (!drv) | |
292 | return 0; | |
293 | ||
294 | if (drv->pm) { | |
295 | if (drv->pm->poweroff_noirq) | |
296 | ret = drv->pm->poweroff_noirq(dev); | |
297 | } | |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
302 | static int of_platform_pm_restore(struct device *dev) | |
303 | { | |
304 | struct device_driver *drv = dev->driver; | |
305 | int ret = 0; | |
306 | ||
307 | if (!drv) | |
308 | return 0; | |
309 | ||
310 | if (drv->pm) { | |
311 | if (drv->pm->restore) | |
312 | ret = drv->pm->restore(dev); | |
313 | } else { | |
314 | ret = of_platform_legacy_resume(dev); | |
315 | } | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | static int of_platform_pm_restore_noirq(struct device *dev) | |
321 | { | |
322 | struct device_driver *drv = dev->driver; | |
323 | int ret = 0; | |
324 | ||
325 | if (!drv) | |
326 | return 0; | |
327 | ||
328 | if (drv->pm) { | |
329 | if (drv->pm->restore_noirq) | |
330 | ret = drv->pm->restore_noirq(dev); | |
331 | } | |
332 | ||
333 | return ret; | |
334 | } | |
335 | ||
336 | #else /* !CONFIG_HIBERNATION */ | |
337 | ||
338 | #define of_platform_pm_freeze NULL | |
339 | #define of_platform_pm_thaw NULL | |
340 | #define of_platform_pm_poweroff NULL | |
341 | #define of_platform_pm_restore NULL | |
342 | #define of_platform_pm_freeze_noirq NULL | |
343 | #define of_platform_pm_thaw_noirq NULL | |
344 | #define of_platform_pm_poweroff_noirq NULL | |
345 | #define of_platform_pm_restore_noirq NULL | |
346 | ||
347 | #endif /* !CONFIG_HIBERNATION */ | |
348 | ||
349 | static struct dev_pm_ops of_platform_dev_pm_ops = { | |
350 | .prepare = of_platform_pm_prepare, | |
351 | .complete = of_platform_pm_complete, | |
352 | .suspend = of_platform_pm_suspend, | |
353 | .resume = of_platform_pm_resume, | |
354 | .freeze = of_platform_pm_freeze, | |
355 | .thaw = of_platform_pm_thaw, | |
356 | .poweroff = of_platform_pm_poweroff, | |
357 | .restore = of_platform_pm_restore, | |
358 | .suspend_noirq = of_platform_pm_suspend_noirq, | |
359 | .resume_noirq = of_platform_pm_resume_noirq, | |
360 | .freeze_noirq = of_platform_pm_freeze_noirq, | |
361 | .thaw_noirq = of_platform_pm_thaw_noirq, | |
362 | .poweroff_noirq = of_platform_pm_poweroff_noirq, | |
363 | .restore_noirq = of_platform_pm_restore_noirq, | |
364 | }; | |
365 | ||
366 | #define OF_PLATFORM_PM_OPS_PTR (&of_platform_dev_pm_ops) | |
367 | ||
368 | #else /* !CONFIG_PM_SLEEP */ | |
369 | ||
370 | #define OF_PLATFORM_PM_OPS_PTR NULL | |
371 | ||
372 | #endif /* !CONFIG_PM_SLEEP */ | |
373 | ||
3f23de10 SR |
374 | int of_bus_type_init(struct bus_type *bus, const char *name) |
375 | { | |
376 | bus->name = name; | |
377 | bus->match = of_platform_bus_match; | |
378 | bus->probe = of_platform_device_probe; | |
379 | bus->remove = of_platform_device_remove; | |
a09ad3c4 | 380 | bus->shutdown = of_platform_device_shutdown; |
140b932f | 381 | bus->dev_attrs = of_platform_device_attrs; |
d35ef90b | 382 | bus->pm = OF_PLATFORM_PM_OPS_PTR; |
3f23de10 SR |
383 | return bus_register(bus); |
384 | } | |
5c457083 SR |
385 | |
386 | int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus) | |
387 | { | |
5c457083 SR |
388 | drv->driver.bus = bus; |
389 | ||
390 | /* register with core */ | |
391 | return driver_register(&drv->driver); | |
392 | } | |
393 | EXPORT_SYMBOL(of_register_driver); | |
394 | ||
395 | void of_unregister_driver(struct of_platform_driver *drv) | |
396 | { | |
397 | driver_unregister(&drv->driver); | |
398 | } | |
399 | EXPORT_SYMBOL(of_unregister_driver); | |
5fd200f3 GL |
400 | |
401 | #if !defined(CONFIG_SPARC) | |
402 | /* | |
403 | * The following routines scan a subtree and registers a device for | |
404 | * each applicable node. | |
405 | * | |
406 | * Note: sparc doesn't use these routines because it has a different | |
407 | * mechanism for creating devices from device tree nodes. | |
408 | */ | |
409 | ||
410 | /** | |
411 | * of_platform_device_create - Alloc, initialize and register an of_device | |
412 | * @np: pointer to node to create device for | |
413 | * @bus_id: name to assign device | |
414 | * @parent: Linux device model parent device. | |
415 | */ | |
416 | struct of_device *of_platform_device_create(struct device_node *np, | |
417 | const char *bus_id, | |
418 | struct device *parent) | |
419 | { | |
420 | struct of_device *dev; | |
421 | ||
422 | dev = of_device_alloc(np, bus_id, parent); | |
423 | if (!dev) | |
424 | return NULL; | |
425 | ||
426 | dev->archdata.dma_mask = 0xffffffffUL; | |
427 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
428 | dev->dev.bus = &of_platform_bus_type; | |
429 | ||
430 | /* We do not fill the DMA ops for platform devices by default. | |
431 | * This is currently the responsibility of the platform code | |
432 | * to do such, possibly using a device notifier | |
433 | */ | |
434 | ||
435 | if (of_device_register(dev) != 0) { | |
436 | of_device_free(dev); | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | return dev; | |
441 | } | |
442 | EXPORT_SYMBOL(of_platform_device_create); | |
443 | ||
444 | /** | |
445 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
446 | * children. Optionally recursively instantiate matching busses. | |
447 | * @bus: device node of the bus to instantiate | |
448 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
449 | * disallow recursive creation of child busses | |
450 | */ | |
451 | static int of_platform_bus_create(const struct device_node *bus, | |
452 | const struct of_device_id *matches, | |
453 | struct device *parent) | |
454 | { | |
455 | struct device_node *child; | |
456 | struct of_device *dev; | |
457 | int rc = 0; | |
458 | ||
459 | for_each_child_of_node(bus, child) { | |
460 | pr_debug(" create child: %s\n", child->full_name); | |
461 | dev = of_platform_device_create(child, NULL, parent); | |
462 | if (dev == NULL) | |
463 | rc = -ENOMEM; | |
464 | else if (!of_match_node(matches, child)) | |
465 | continue; | |
466 | if (rc == 0) { | |
467 | pr_debug(" and sub busses\n"); | |
468 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
469 | } | |
470 | if (rc) { | |
471 | of_node_put(child); | |
472 | break; | |
473 | } | |
474 | } | |
475 | return rc; | |
476 | } | |
477 | ||
478 | /** | |
479 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
480 | * @root: parent of the first level to probe or NULL for the root of the tree | |
481 | * @matches: match table, NULL to use the default | |
482 | * @parent: parent to hook devices from, NULL for toplevel | |
483 | * | |
484 | * Note that children of the provided root are not instantiated as devices | |
485 | * unless the specified root itself matches the bus list and is not NULL. | |
486 | */ | |
487 | int of_platform_bus_probe(struct device_node *root, | |
488 | const struct of_device_id *matches, | |
489 | struct device *parent) | |
490 | { | |
491 | struct device_node *child; | |
492 | struct of_device *dev; | |
493 | int rc = 0; | |
494 | ||
495 | if (matches == NULL) | |
496 | matches = of_default_bus_ids; | |
497 | if (matches == OF_NO_DEEP_PROBE) | |
498 | return -EINVAL; | |
499 | if (root == NULL) | |
500 | root = of_find_node_by_path("/"); | |
501 | else | |
502 | of_node_get(root); | |
503 | ||
504 | pr_debug("of_platform_bus_probe()\n"); | |
505 | pr_debug(" starting at: %s\n", root->full_name); | |
506 | ||
507 | /* Do a self check of bus type, if there's a match, create | |
508 | * children | |
509 | */ | |
510 | if (of_match_node(matches, root)) { | |
511 | pr_debug(" root match, create all sub devices\n"); | |
512 | dev = of_platform_device_create(root, NULL, parent); | |
513 | if (dev == NULL) { | |
514 | rc = -ENOMEM; | |
515 | goto bail; | |
516 | } | |
517 | pr_debug(" create all sub busses\n"); | |
518 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
519 | goto bail; | |
520 | } | |
521 | for_each_child_of_node(root, child) { | |
522 | if (!of_match_node(matches, child)) | |
523 | continue; | |
524 | ||
525 | pr_debug(" match: %s\n", child->full_name); | |
526 | dev = of_platform_device_create(child, NULL, parent); | |
527 | if (dev == NULL) | |
528 | rc = -ENOMEM; | |
529 | else | |
530 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
531 | if (rc) { | |
532 | of_node_put(child); | |
533 | break; | |
534 | } | |
535 | } | |
536 | bail: | |
537 | of_node_put(root); | |
538 | return rc; | |
539 | } | |
540 | EXPORT_SYMBOL(of_platform_bus_probe); | |
541 | #endif /* !CONFIG_SPARC */ |