Commit | Line | Data |
---|---|---|
85eb8c8d RW |
1 | /* |
2 | * drivers/base/power/clock_ops.c - Generic clock manipulation PM callbacks | |
3 | * | |
4 | * Copyright (c) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
85eb8c8d | 9 | #include <linux/kernel.h> |
51990e82 | 10 | #include <linux/device.h> |
85eb8c8d RW |
11 | #include <linux/io.h> |
12 | #include <linux/pm.h> | |
b5e8d269 | 13 | #include <linux/pm_clock.h> |
85eb8c8d | 14 | #include <linux/clk.h> |
245bd6f6 | 15 | #include <linux/clkdev.h> |
85eb8c8d RW |
16 | #include <linux/slab.h> |
17 | #include <linux/err.h> | |
989561de | 18 | #include <linux/pm_domain.h> |
75f50400 | 19 | #include <linux/pm_runtime.h> |
85eb8c8d | 20 | |
a6175616 | 21 | #ifdef CONFIG_PM_CLK |
85eb8c8d | 22 | |
85eb8c8d RW |
23 | enum pce_status { |
24 | PCE_STATUS_NONE = 0, | |
25 | PCE_STATUS_ACQUIRED, | |
26 | PCE_STATUS_ENABLED, | |
27 | PCE_STATUS_ERROR, | |
28 | }; | |
29 | ||
30 | struct pm_clock_entry { | |
31 | struct list_head node; | |
32 | char *con_id; | |
33 | struct clk *clk; | |
34 | enum pce_status status; | |
35 | }; | |
36 | ||
5cda3fbb BD |
37 | /** |
38 | * pm_clk_enable - Enable a clock, reporting any errors | |
39 | * @dev: The device for the given clock | |
471f7707 | 40 | * @ce: PM clock entry corresponding to the clock. |
5cda3fbb | 41 | */ |
f4745a92 | 42 | static inline void __pm_clk_enable(struct device *dev, struct pm_clock_entry *ce) |
5cda3fbb | 43 | { |
471f7707 SG |
44 | int ret; |
45 | ||
46 | if (ce->status < PCE_STATUS_ERROR) { | |
47 | ret = clk_enable(ce->clk); | |
48 | if (!ret) | |
49 | ce->status = PCE_STATUS_ENABLED; | |
50 | else | |
51 | dev_err(dev, "%s: failed to enable clk %p, error %d\n", | |
52 | __func__, ce->clk, ret); | |
53 | } | |
5cda3fbb BD |
54 | } |
55 | ||
e8b364b8 RW |
56 | /** |
57 | * pm_clk_acquire - Acquire a device clock. | |
58 | * @dev: Device whose clock is to be acquired. | |
59 | * @ce: PM clock entry corresponding to the clock. | |
60 | */ | |
61 | static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce) | |
62 | { | |
245bd6f6 GU |
63 | if (!ce->clk) |
64 | ce->clk = clk_get(dev, ce->con_id); | |
e8b364b8 RW |
65 | if (IS_ERR(ce->clk)) { |
66 | ce->status = PCE_STATUS_ERROR; | |
67 | } else { | |
8a6720ec | 68 | clk_prepare(ce->clk); |
e8b364b8 | 69 | ce->status = PCE_STATUS_ACQUIRED; |
f17f4adf GU |
70 | dev_dbg(dev, "Clock %pC con_id %s managed by runtime PM.\n", |
71 | ce->clk, ce->con_id); | |
e8b364b8 RW |
72 | } |
73 | } | |
74 | ||
245bd6f6 GU |
75 | static int __pm_clk_add(struct device *dev, const char *con_id, |
76 | struct clk *clk) | |
85eb8c8d | 77 | { |
5c095a0e | 78 | struct pm_subsys_data *psd = dev_to_psd(dev); |
85eb8c8d RW |
79 | struct pm_clock_entry *ce; |
80 | ||
5c095a0e | 81 | if (!psd) |
85eb8c8d RW |
82 | return -EINVAL; |
83 | ||
84 | ce = kzalloc(sizeof(*ce), GFP_KERNEL); | |
59d84ca8 | 85 | if (!ce) |
85eb8c8d | 86 | return -ENOMEM; |
85eb8c8d RW |
87 | |
88 | if (con_id) { | |
89 | ce->con_id = kstrdup(con_id, GFP_KERNEL); | |
90 | if (!ce->con_id) { | |
91 | dev_err(dev, | |
92 | "Not enough memory for clock connection ID.\n"); | |
93 | kfree(ce); | |
94 | return -ENOMEM; | |
95 | } | |
245bd6f6 | 96 | } else { |
772b0508 | 97 | if (IS_ERR(clk)) { |
245bd6f6 GU |
98 | kfree(ce); |
99 | return -ENOENT; | |
100 | } | |
101 | ce->clk = clk; | |
85eb8c8d RW |
102 | } |
103 | ||
e8b364b8 RW |
104 | pm_clk_acquire(dev, ce); |
105 | ||
5c095a0e RW |
106 | spin_lock_irq(&psd->lock); |
107 | list_add_tail(&ce->node, &psd->clock_list); | |
108 | spin_unlock_irq(&psd->lock); | |
85eb8c8d RW |
109 | return 0; |
110 | } | |
111 | ||
245bd6f6 GU |
112 | /** |
113 | * pm_clk_add - Start using a device clock for power management. | |
114 | * @dev: Device whose clock is going to be used for power management. | |
115 | * @con_id: Connection ID of the clock. | |
116 | * | |
117 | * Add the clock represented by @con_id to the list of clocks used for | |
118 | * the power management of @dev. | |
119 | */ | |
120 | int pm_clk_add(struct device *dev, const char *con_id) | |
121 | { | |
122 | return __pm_clk_add(dev, con_id, NULL); | |
123 | } | |
124 | ||
125 | /** | |
126 | * pm_clk_add_clk - Start using a device clock for power management. | |
127 | * @dev: Device whose clock is going to be used for power management. | |
128 | * @clk: Clock pointer | |
129 | * | |
130 | * Add the clock to the list of clocks used for the power management of @dev. | |
772b0508 SB |
131 | * The power-management code will take control of the clock reference, so |
132 | * callers should not call clk_put() on @clk after this function sucessfully | |
133 | * returned. | |
245bd6f6 GU |
134 | */ |
135 | int pm_clk_add_clk(struct device *dev, struct clk *clk) | |
136 | { | |
137 | return __pm_clk_add(dev, NULL, clk); | |
138 | } | |
139 | ||
02113ba9 JH |
140 | |
141 | /** | |
142 | * of_pm_clk_add_clks - Start using device clock(s) for power management. | |
143 | * @dev: Device whose clock(s) is going to be used for power management. | |
144 | * | |
145 | * Add a series of clocks described in the 'clocks' device-tree node for | |
146 | * a device to the list of clocks used for the power management of @dev. | |
147 | * On success, returns the number of clocks added. Returns a negative | |
148 | * error code if there are no clocks in the device node for the device | |
149 | * or if adding a clock fails. | |
150 | */ | |
151 | int of_pm_clk_add_clks(struct device *dev) | |
152 | { | |
153 | struct clk **clks; | |
154 | unsigned int i, count; | |
155 | int ret; | |
156 | ||
157 | if (!dev || !dev->of_node) | |
158 | return -EINVAL; | |
159 | ||
160 | count = of_count_phandle_with_args(dev->of_node, "clocks", | |
161 | "#clock-cells"); | |
0b26985a | 162 | if (count <= 0) |
02113ba9 JH |
163 | return -ENODEV; |
164 | ||
165 | clks = kcalloc(count, sizeof(*clks), GFP_KERNEL); | |
166 | if (!clks) | |
167 | return -ENOMEM; | |
168 | ||
169 | for (i = 0; i < count; i++) { | |
170 | clks[i] = of_clk_get(dev->of_node, i); | |
171 | if (IS_ERR(clks[i])) { | |
172 | ret = PTR_ERR(clks[i]); | |
173 | goto error; | |
174 | } | |
175 | ||
176 | ret = pm_clk_add_clk(dev, clks[i]); | |
177 | if (ret) { | |
178 | clk_put(clks[i]); | |
179 | goto error; | |
180 | } | |
181 | } | |
182 | ||
183 | kfree(clks); | |
184 | ||
185 | return i; | |
186 | ||
187 | error: | |
188 | while (i--) | |
189 | pm_clk_remove_clk(dev, clks[i]); | |
190 | ||
191 | kfree(clks); | |
192 | ||
193 | return ret; | |
194 | } | |
195 | ||
85eb8c8d | 196 | /** |
3d5c3036 RW |
197 | * __pm_clk_remove - Destroy PM clock entry. |
198 | * @ce: PM clock entry to destroy. | |
85eb8c8d | 199 | */ |
3d5c3036 | 200 | static void __pm_clk_remove(struct pm_clock_entry *ce) |
85eb8c8d RW |
201 | { |
202 | if (!ce) | |
203 | return; | |
204 | ||
85eb8c8d RW |
205 | if (ce->status < PCE_STATUS_ERROR) { |
206 | if (ce->status == PCE_STATUS_ENABLED) | |
8a6720ec | 207 | clk_disable(ce->clk); |
85eb8c8d | 208 | |
8a6720ec BD |
209 | if (ce->status >= PCE_STATUS_ACQUIRED) { |
210 | clk_unprepare(ce->clk); | |
85eb8c8d | 211 | clk_put(ce->clk); |
8a6720ec | 212 | } |
85eb8c8d RW |
213 | } |
214 | ||
0ab1e79b | 215 | kfree(ce->con_id); |
85eb8c8d RW |
216 | kfree(ce); |
217 | } | |
218 | ||
219 | /** | |
3d5c3036 RW |
220 | * pm_clk_remove - Stop using a device clock for power management. |
221 | * @dev: Device whose clock should not be used for PM any more. | |
85eb8c8d RW |
222 | * @con_id: Connection ID of the clock. |
223 | * | |
224 | * Remove the clock represented by @con_id from the list of clocks used for | |
3d5c3036 | 225 | * the power management of @dev. |
85eb8c8d | 226 | */ |
3d5c3036 | 227 | void pm_clk_remove(struct device *dev, const char *con_id) |
85eb8c8d | 228 | { |
5c095a0e | 229 | struct pm_subsys_data *psd = dev_to_psd(dev); |
85eb8c8d RW |
230 | struct pm_clock_entry *ce; |
231 | ||
5c095a0e | 232 | if (!psd) |
85eb8c8d RW |
233 | return; |
234 | ||
5c095a0e | 235 | spin_lock_irq(&psd->lock); |
85eb8c8d | 236 | |
5c095a0e | 237 | list_for_each_entry(ce, &psd->clock_list, node) { |
e8b364b8 RW |
238 | if (!con_id && !ce->con_id) |
239 | goto remove; | |
240 | else if (!con_id || !ce->con_id) | |
85eb8c8d | 241 | continue; |
e8b364b8 RW |
242 | else if (!strcmp(con_id, ce->con_id)) |
243 | goto remove; | |
85eb8c8d RW |
244 | } |
245 | ||
5c095a0e | 246 | spin_unlock_irq(&psd->lock); |
e8b364b8 RW |
247 | return; |
248 | ||
249 | remove: | |
250 | list_del(&ce->node); | |
0d41da2e | 251 | spin_unlock_irq(&psd->lock); |
e8b364b8 RW |
252 | |
253 | __pm_clk_remove(ce); | |
85eb8c8d RW |
254 | } |
255 | ||
02113ba9 JH |
256 | /** |
257 | * pm_clk_remove_clk - Stop using a device clock for power management. | |
258 | * @dev: Device whose clock should not be used for PM any more. | |
259 | * @clk: Clock pointer | |
260 | * | |
261 | * Remove the clock pointed to by @clk from the list of clocks used for | |
262 | * the power management of @dev. | |
263 | */ | |
264 | void pm_clk_remove_clk(struct device *dev, struct clk *clk) | |
265 | { | |
266 | struct pm_subsys_data *psd = dev_to_psd(dev); | |
267 | struct pm_clock_entry *ce; | |
268 | ||
269 | if (!psd || !clk) | |
270 | return; | |
271 | ||
272 | spin_lock_irq(&psd->lock); | |
273 | ||
274 | list_for_each_entry(ce, &psd->clock_list, node) { | |
275 | if (clk == ce->clk) | |
276 | goto remove; | |
277 | } | |
278 | ||
279 | spin_unlock_irq(&psd->lock); | |
280 | return; | |
281 | ||
282 | remove: | |
283 | list_del(&ce->node); | |
284 | spin_unlock_irq(&psd->lock); | |
285 | ||
286 | __pm_clk_remove(ce); | |
287 | } | |
288 | ||
85eb8c8d | 289 | /** |
3d5c3036 RW |
290 | * pm_clk_init - Initialize a device's list of power management clocks. |
291 | * @dev: Device to initialize the list of PM clocks for. | |
85eb8c8d | 292 | * |
5c095a0e RW |
293 | * Initialize the lock and clock_list members of the device's pm_subsys_data |
294 | * object. | |
85eb8c8d | 295 | */ |
5c095a0e | 296 | void pm_clk_init(struct device *dev) |
85eb8c8d | 297 | { |
5c095a0e | 298 | struct pm_subsys_data *psd = dev_to_psd(dev); |
ef27bed1 RW |
299 | if (psd) |
300 | INIT_LIST_HEAD(&psd->clock_list); | |
5c095a0e RW |
301 | } |
302 | ||
303 | /** | |
304 | * pm_clk_create - Create and initialize a device's list of PM clocks. | |
305 | * @dev: Device to create and initialize the list of PM clocks for. | |
306 | * | |
307 | * Allocate a struct pm_subsys_data object, initialize its lock and clock_list | |
308 | * members and make the @dev's power.subsys_data field point to it. | |
309 | */ | |
310 | int pm_clk_create(struct device *dev) | |
311 | { | |
77254950 | 312 | return dev_pm_get_subsys_data(dev); |
85eb8c8d RW |
313 | } |
314 | ||
315 | /** | |
3d5c3036 RW |
316 | * pm_clk_destroy - Destroy a device's list of power management clocks. |
317 | * @dev: Device to destroy the list of PM clocks for. | |
85eb8c8d RW |
318 | * |
319 | * Clear the @dev's power.subsys_data field, remove the list of clock entries | |
5c095a0e | 320 | * from the struct pm_subsys_data object pointed to by it before and free |
85eb8c8d RW |
321 | * that object. |
322 | */ | |
3d5c3036 | 323 | void pm_clk_destroy(struct device *dev) |
85eb8c8d | 324 | { |
5c095a0e | 325 | struct pm_subsys_data *psd = dev_to_psd(dev); |
85eb8c8d | 326 | struct pm_clock_entry *ce, *c; |
e8b364b8 | 327 | struct list_head list; |
85eb8c8d | 328 | |
5c095a0e | 329 | if (!psd) |
85eb8c8d RW |
330 | return; |
331 | ||
e8b364b8 | 332 | INIT_LIST_HEAD(&list); |
85eb8c8d | 333 | |
5c095a0e | 334 | spin_lock_irq(&psd->lock); |
85eb8c8d | 335 | |
5c095a0e | 336 | list_for_each_entry_safe_reverse(ce, c, &psd->clock_list, node) |
e8b364b8 | 337 | list_move(&ce->node, &list); |
85eb8c8d | 338 | |
5c095a0e | 339 | spin_unlock_irq(&psd->lock); |
85eb8c8d | 340 | |
ef27bed1 | 341 | dev_pm_put_subsys_data(dev); |
e8b364b8 RW |
342 | |
343 | list_for_each_entry_safe_reverse(ce, c, &list, node) { | |
344 | list_del(&ce->node); | |
345 | __pm_clk_remove(ce); | |
346 | } | |
85eb8c8d RW |
347 | } |
348 | ||
85eb8c8d | 349 | /** |
3d5c3036 | 350 | * pm_clk_suspend - Disable clocks in a device's PM clock list. |
85eb8c8d RW |
351 | * @dev: Device to disable the clocks for. |
352 | */ | |
3d5c3036 | 353 | int pm_clk_suspend(struct device *dev) |
85eb8c8d | 354 | { |
5c095a0e | 355 | struct pm_subsys_data *psd = dev_to_psd(dev); |
85eb8c8d | 356 | struct pm_clock_entry *ce; |
b7ab83ed | 357 | unsigned long flags; |
85eb8c8d RW |
358 | |
359 | dev_dbg(dev, "%s()\n", __func__); | |
360 | ||
5c095a0e | 361 | if (!psd) |
85eb8c8d RW |
362 | return 0; |
363 | ||
5c095a0e | 364 | spin_lock_irqsave(&psd->lock, flags); |
85eb8c8d | 365 | |
5c095a0e | 366 | list_for_each_entry_reverse(ce, &psd->clock_list, node) { |
85eb8c8d | 367 | if (ce->status < PCE_STATUS_ERROR) { |
24050956 MD |
368 | if (ce->status == PCE_STATUS_ENABLED) |
369 | clk_disable(ce->clk); | |
85eb8c8d RW |
370 | ce->status = PCE_STATUS_ACQUIRED; |
371 | } | |
372 | } | |
373 | ||
5c095a0e | 374 | spin_unlock_irqrestore(&psd->lock, flags); |
85eb8c8d RW |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
379 | /** | |
3d5c3036 | 380 | * pm_clk_resume - Enable clocks in a device's PM clock list. |
85eb8c8d RW |
381 | * @dev: Device to enable the clocks for. |
382 | */ | |
3d5c3036 | 383 | int pm_clk_resume(struct device *dev) |
85eb8c8d | 384 | { |
5c095a0e | 385 | struct pm_subsys_data *psd = dev_to_psd(dev); |
85eb8c8d | 386 | struct pm_clock_entry *ce; |
b7ab83ed | 387 | unsigned long flags; |
85eb8c8d RW |
388 | |
389 | dev_dbg(dev, "%s()\n", __func__); | |
390 | ||
5c095a0e | 391 | if (!psd) |
85eb8c8d RW |
392 | return 0; |
393 | ||
5c095a0e | 394 | spin_lock_irqsave(&psd->lock, flags); |
85eb8c8d | 395 | |
471f7707 SG |
396 | list_for_each_entry(ce, &psd->clock_list, node) |
397 | __pm_clk_enable(dev, ce); | |
85eb8c8d | 398 | |
5c095a0e | 399 | spin_unlock_irqrestore(&psd->lock, flags); |
85eb8c8d RW |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
404 | /** | |
3d5c3036 | 405 | * pm_clk_notify - Notify routine for device addition and removal. |
85eb8c8d RW |
406 | * @nb: Notifier block object this function is a member of. |
407 | * @action: Operation being carried out by the caller. | |
408 | * @data: Device the routine is being run for. | |
409 | * | |
410 | * For this function to work, @nb must be a member of an object of type | |
411 | * struct pm_clk_notifier_block containing all of the requisite data. | |
564b905a RW |
412 | * Specifically, the pm_domain member of that object is copied to the device's |
413 | * pm_domain field and its con_ids member is used to populate the device's list | |
3d5c3036 | 414 | * of PM clocks, depending on @action. |
85eb8c8d | 415 | * |
564b905a | 416 | * If the device's pm_domain field is already populated with a value different |
85eb8c8d RW |
417 | * from the one stored in the struct pm_clk_notifier_block object, the function |
418 | * does nothing. | |
419 | */ | |
3d5c3036 | 420 | static int pm_clk_notify(struct notifier_block *nb, |
85eb8c8d RW |
421 | unsigned long action, void *data) |
422 | { | |
423 | struct pm_clk_notifier_block *clknb; | |
424 | struct device *dev = data; | |
3b3eca31 | 425 | char **con_id; |
85eb8c8d RW |
426 | int error; |
427 | ||
428 | dev_dbg(dev, "%s() %ld\n", __func__, action); | |
429 | ||
430 | clknb = container_of(nb, struct pm_clk_notifier_block, nb); | |
431 | ||
432 | switch (action) { | |
433 | case BUS_NOTIFY_ADD_DEVICE: | |
564b905a | 434 | if (dev->pm_domain) |
85eb8c8d RW |
435 | break; |
436 | ||
5c095a0e | 437 | error = pm_clk_create(dev); |
85eb8c8d RW |
438 | if (error) |
439 | break; | |
440 | ||
989561de | 441 | dev_pm_domain_set(dev, clknb->pm_domain); |
85eb8c8d | 442 | if (clknb->con_ids[0]) { |
3b3eca31 | 443 | for (con_id = clknb->con_ids; *con_id; con_id++) |
3d5c3036 | 444 | pm_clk_add(dev, *con_id); |
85eb8c8d | 445 | } else { |
3d5c3036 | 446 | pm_clk_add(dev, NULL); |
85eb8c8d RW |
447 | } |
448 | ||
449 | break; | |
450 | case BUS_NOTIFY_DEL_DEVICE: | |
564b905a | 451 | if (dev->pm_domain != clknb->pm_domain) |
85eb8c8d RW |
452 | break; |
453 | ||
989561de | 454 | dev_pm_domain_set(dev, NULL); |
3d5c3036 | 455 | pm_clk_destroy(dev); |
85eb8c8d RW |
456 | break; |
457 | } | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
75f50400 RN |
462 | int pm_clk_runtime_suspend(struct device *dev) |
463 | { | |
464 | int ret; | |
465 | ||
466 | dev_dbg(dev, "%s\n", __func__); | |
467 | ||
468 | ret = pm_generic_runtime_suspend(dev); | |
469 | if (ret) { | |
470 | dev_err(dev, "failed to suspend device\n"); | |
471 | return ret; | |
472 | } | |
473 | ||
474 | ret = pm_clk_suspend(dev); | |
475 | if (ret) { | |
476 | dev_err(dev, "failed to suspend clock\n"); | |
477 | pm_generic_runtime_resume(dev); | |
478 | return ret; | |
479 | } | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | int pm_clk_runtime_resume(struct device *dev) | |
485 | { | |
486 | int ret; | |
487 | ||
488 | dev_dbg(dev, "%s\n", __func__); | |
489 | ||
490 | ret = pm_clk_resume(dev); | |
491 | if (ret) { | |
492 | dev_err(dev, "failed to resume clock\n"); | |
493 | return ret; | |
494 | } | |
495 | ||
496 | return pm_generic_runtime_resume(dev); | |
497 | } | |
498 | ||
a6175616 | 499 | #else /* !CONFIG_PM_CLK */ |
b7b95920 | 500 | |
85eb8c8d RW |
501 | /** |
502 | * enable_clock - Enable a device clock. | |
503 | * @dev: Device whose clock is to be enabled. | |
504 | * @con_id: Connection ID of the clock. | |
505 | */ | |
506 | static void enable_clock(struct device *dev, const char *con_id) | |
507 | { | |
508 | struct clk *clk; | |
509 | ||
510 | clk = clk_get(dev, con_id); | |
511 | if (!IS_ERR(clk)) { | |
c122f27e | 512 | clk_prepare_enable(clk); |
85eb8c8d RW |
513 | clk_put(clk); |
514 | dev_info(dev, "Runtime PM disabled, clock forced on.\n"); | |
515 | } | |
516 | } | |
517 | ||
518 | /** | |
519 | * disable_clock - Disable a device clock. | |
520 | * @dev: Device whose clock is to be disabled. | |
521 | * @con_id: Connection ID of the clock. | |
522 | */ | |
523 | static void disable_clock(struct device *dev, const char *con_id) | |
524 | { | |
525 | struct clk *clk; | |
526 | ||
527 | clk = clk_get(dev, con_id); | |
528 | if (!IS_ERR(clk)) { | |
c122f27e | 529 | clk_disable_unprepare(clk); |
85eb8c8d RW |
530 | clk_put(clk); |
531 | dev_info(dev, "Runtime PM disabled, clock forced off.\n"); | |
532 | } | |
533 | } | |
534 | ||
535 | /** | |
3d5c3036 | 536 | * pm_clk_notify - Notify routine for device addition and removal. |
85eb8c8d RW |
537 | * @nb: Notifier block object this function is a member of. |
538 | * @action: Operation being carried out by the caller. | |
539 | * @data: Device the routine is being run for. | |
540 | * | |
541 | * For this function to work, @nb must be a member of an object of type | |
542 | * struct pm_clk_notifier_block containing all of the requisite data. | |
543 | * Specifically, the con_ids member of that object is used to enable or disable | |
544 | * the device's clocks, depending on @action. | |
545 | */ | |
3d5c3036 | 546 | static int pm_clk_notify(struct notifier_block *nb, |
85eb8c8d RW |
547 | unsigned long action, void *data) |
548 | { | |
549 | struct pm_clk_notifier_block *clknb; | |
550 | struct device *dev = data; | |
3b3eca31 | 551 | char **con_id; |
85eb8c8d RW |
552 | |
553 | dev_dbg(dev, "%s() %ld\n", __func__, action); | |
554 | ||
555 | clknb = container_of(nb, struct pm_clk_notifier_block, nb); | |
556 | ||
557 | switch (action) { | |
4d1518f5 | 558 | case BUS_NOTIFY_BIND_DRIVER: |
85eb8c8d | 559 | if (clknb->con_ids[0]) { |
3b3eca31 RW |
560 | for (con_id = clknb->con_ids; *con_id; con_id++) |
561 | enable_clock(dev, *con_id); | |
85eb8c8d RW |
562 | } else { |
563 | enable_clock(dev, NULL); | |
564 | } | |
565 | break; | |
d35818a9 | 566 | case BUS_NOTIFY_DRIVER_NOT_BOUND: |
4d1518f5 | 567 | case BUS_NOTIFY_UNBOUND_DRIVER: |
85eb8c8d | 568 | if (clknb->con_ids[0]) { |
3b3eca31 RW |
569 | for (con_id = clknb->con_ids; *con_id; con_id++) |
570 | disable_clock(dev, *con_id); | |
85eb8c8d RW |
571 | } else { |
572 | disable_clock(dev, NULL); | |
573 | } | |
574 | break; | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
a6175616 | 580 | #endif /* !CONFIG_PM_CLK */ |
85eb8c8d RW |
581 | |
582 | /** | |
3d5c3036 | 583 | * pm_clk_add_notifier - Add bus type notifier for power management clocks. |
85eb8c8d RW |
584 | * @bus: Bus type to add the notifier to. |
585 | * @clknb: Notifier to be added to the given bus type. | |
586 | * | |
587 | * The nb member of @clknb is not expected to be initialized and its | |
3d5c3036 | 588 | * notifier_call member will be replaced with pm_clk_notify(). However, |
85eb8c8d RW |
589 | * the remaining members of @clknb should be populated prior to calling this |
590 | * routine. | |
591 | */ | |
3d5c3036 | 592 | void pm_clk_add_notifier(struct bus_type *bus, |
85eb8c8d RW |
593 | struct pm_clk_notifier_block *clknb) |
594 | { | |
595 | if (!bus || !clknb) | |
596 | return; | |
597 | ||
3d5c3036 | 598 | clknb->nb.notifier_call = pm_clk_notify; |
85eb8c8d RW |
599 | bus_register_notifier(bus, &clknb->nb); |
600 | } |