Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
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 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
6a0ae73d | 13 | #include <linux/pm_opp.h> |
f721889f RW |
14 | #include <linux/pm_runtime.h> |
15 | #include <linux/pm_domain.h> | |
6ff7bb0d | 16 | #include <linux/pm_qos.h> |
c11f6f5b | 17 | #include <linux/pm_clock.h> |
f721889f RW |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> | |
17b75eca RW |
20 | #include <linux/sched.h> |
21 | #include <linux/suspend.h> | |
d5e4cbfe RW |
22 | #include <linux/export.h> |
23 | ||
aa8e54b5 TV |
24 | #include "power.h" |
25 | ||
93af5e93 GU |
26 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
27 | ||
d5e4cbfe RW |
28 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
29 | ({ \ | |
30 | type (*__routine)(struct device *__d); \ | |
31 | type __ret = (type)0; \ | |
32 | \ | |
33 | __routine = genpd->dev_ops.callback; \ | |
34 | if (__routine) { \ | |
35 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
36 | } \ |
37 | __ret; \ | |
38 | }) | |
f721889f | 39 | |
5125bbf3 RW |
40 | static LIST_HEAD(gpd_list); |
41 | static DEFINE_MUTEX(gpd_list_lock); | |
42 | ||
35241d12 LI |
43 | struct genpd_lock_ops { |
44 | void (*lock)(struct generic_pm_domain *genpd); | |
45 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
46 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
47 | void (*unlock)(struct generic_pm_domain *genpd); | |
48 | }; | |
49 | ||
50 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
51 | { | |
52 | mutex_lock(&genpd->mlock); | |
53 | } | |
54 | ||
55 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
56 | int depth) | |
57 | { | |
58 | mutex_lock_nested(&genpd->mlock, depth); | |
59 | } | |
60 | ||
61 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
62 | { | |
63 | return mutex_lock_interruptible(&genpd->mlock); | |
64 | } | |
65 | ||
66 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
67 | { | |
68 | return mutex_unlock(&genpd->mlock); | |
69 | } | |
70 | ||
71 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
72 | .lock = genpd_lock_mtx, | |
73 | .lock_nested = genpd_lock_nested_mtx, | |
74 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
75 | .unlock = genpd_unlock_mtx, | |
76 | }; | |
77 | ||
d716f479 LI |
78 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
79 | __acquires(&genpd->slock) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
83 | spin_lock_irqsave(&genpd->slock, flags); | |
84 | genpd->lock_flags = flags; | |
85 | } | |
86 | ||
87 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
88 | int depth) | |
89 | __acquires(&genpd->slock) | |
90 | { | |
91 | unsigned long flags; | |
92 | ||
93 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
94 | genpd->lock_flags = flags; | |
95 | } | |
96 | ||
97 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
98 | __acquires(&genpd->slock) | |
99 | { | |
100 | unsigned long flags; | |
101 | ||
102 | spin_lock_irqsave(&genpd->slock, flags); | |
103 | genpd->lock_flags = flags; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
108 | __releases(&genpd->slock) | |
109 | { | |
110 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
111 | } | |
112 | ||
113 | static const struct genpd_lock_ops genpd_spin_ops = { | |
114 | .lock = genpd_lock_spin, | |
115 | .lock_nested = genpd_lock_nested_spin, | |
116 | .lock_interruptible = genpd_lock_interruptible_spin, | |
117 | .unlock = genpd_unlock_spin, | |
118 | }; | |
119 | ||
35241d12 LI |
120 | #define genpd_lock(p) p->lock_ops->lock(p) |
121 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
122 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
123 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
124 | ||
41e2c8e0 | 125 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 126 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 127 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 128 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
d716f479 LI |
129 | |
130 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 131 | const struct generic_pm_domain *genpd) |
d716f479 LI |
132 | { |
133 | bool ret; | |
134 | ||
135 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
136 | ||
075c37d5 UH |
137 | /* |
138 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
139 | * to indicate a suboptimal configuration for PM. For an always on | |
140 | * domain this isn't case, thus don't warn. | |
141 | */ | |
142 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
143 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
144 | genpd->name); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
446d999c RK |
149 | /* |
150 | * Get the generic PM domain for a particular struct device. | |
151 | * This validates the struct device pointer, the PM domain pointer, | |
152 | * and checks that the PM domain pointer is a real generic PM domain. | |
153 | * Any failure results in NULL being returned. | |
154 | */ | |
f58d4e5a | 155 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
156 | { |
157 | struct generic_pm_domain *genpd = NULL, *gpd; | |
158 | ||
159 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
160 | return NULL; | |
161 | ||
162 | mutex_lock(&gpd_list_lock); | |
163 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
164 | if (&gpd->domain == dev->pm_domain) { | |
165 | genpd = gpd; | |
166 | break; | |
167 | } | |
168 | } | |
169 | mutex_unlock(&gpd_list_lock); | |
170 | ||
171 | return genpd; | |
172 | } | |
173 | ||
174 | /* | |
175 | * This should only be used where we are certain that the pm_domain | |
176 | * attached to the device is a genpd domain. | |
177 | */ | |
178 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
179 | { |
180 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
181 | return ERR_PTR(-EINVAL); | |
182 | ||
596ba34b | 183 | return pd_to_genpd(dev->pm_domain); |
5248051b | 184 | } |
f721889f | 185 | |
d8600c8b KK |
186 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
187 | struct device *dev) | |
d5e4cbfe | 188 | { |
2b1d88cd | 189 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
190 | } |
191 | ||
d8600c8b KK |
192 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
193 | struct device *dev) | |
d5e4cbfe | 194 | { |
2b1d88cd | 195 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
196 | } |
197 | ||
c4bb3160 | 198 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 199 | { |
c4bb3160 RW |
200 | bool ret = false; |
201 | ||
202 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
203 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
209 | { | |
210 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 211 | smp_mb__after_atomic(); |
f721889f RW |
212 | } |
213 | ||
afece3ab TG |
214 | #ifdef CONFIG_DEBUG_FS |
215 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
216 | { | |
217 | ktime_t delta, now; | |
218 | ||
219 | now = ktime_get(); | |
220 | delta = ktime_sub(now, genpd->accounting_time); | |
221 | ||
222 | /* | |
223 | * If genpd->status is active, it means we are just | |
224 | * out of off and so update the idle time and vice | |
225 | * versa. | |
226 | */ | |
227 | if (genpd->status == GPD_STATE_ACTIVE) { | |
228 | int state_idx = genpd->state_idx; | |
229 | ||
230 | genpd->states[state_idx].idle_time = | |
231 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
232 | } else { | |
233 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
234 | } | |
235 | ||
236 | genpd->accounting_time = now; | |
237 | } | |
238 | #else | |
239 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
240 | #endif | |
241 | ||
cd50c6d3 VK |
242 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
243 | unsigned int state) | |
244 | { | |
245 | struct generic_pm_domain_data *pd_data; | |
246 | struct pm_domain_data *pdd; | |
18edf49c | 247 | struct gpd_link *link; |
cd50c6d3 VK |
248 | |
249 | /* New requested state is same as Max requested state */ | |
250 | if (state == genpd->performance_state) | |
251 | return state; | |
252 | ||
253 | /* New requested state is higher than Max requested state */ | |
254 | if (state > genpd->performance_state) | |
255 | return state; | |
256 | ||
257 | /* Traverse all devices within the domain */ | |
258 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
259 | pd_data = to_gpd_data(pdd); | |
260 | ||
261 | if (pd_data->performance_state > state) | |
262 | state = pd_data->performance_state; | |
263 | } | |
264 | ||
265 | /* | |
18edf49c VK |
266 | * Traverse all sub-domains within the domain. This can be |
267 | * done without any additional locking as the link->performance_state | |
268 | * field is protected by the master genpd->lock, which is already taken. | |
269 | * | |
270 | * Also note that link->performance_state (subdomain's performance state | |
271 | * requirement to master domain) is different from | |
272 | * link->slave->performance_state (current performance state requirement | |
273 | * of the devices/sub-domains of the subdomain) and so can have a | |
274 | * different value. | |
275 | * | |
276 | * Note that we also take vote from powered-off sub-domains into account | |
277 | * as the same is done for devices right now. | |
cd50c6d3 | 278 | */ |
18edf49c VK |
279 | list_for_each_entry(link, &genpd->master_links, master_node) { |
280 | if (link->performance_state > state) | |
281 | state = link->performance_state; | |
282 | } | |
283 | ||
cd50c6d3 VK |
284 | return state; |
285 | } | |
286 | ||
287 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, | |
18edf49c | 288 | unsigned int state, int depth) |
cd50c6d3 | 289 | { |
18edf49c VK |
290 | struct generic_pm_domain *master; |
291 | struct gpd_link *link; | |
292 | int master_state, ret; | |
cd50c6d3 VK |
293 | |
294 | if (state == genpd->performance_state) | |
295 | return 0; | |
296 | ||
18edf49c VK |
297 | /* Propagate to masters of genpd */ |
298 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
299 | master = link->master; | |
300 | ||
301 | if (!master->set_performance_state) | |
302 | continue; | |
303 | ||
304 | /* Find master's performance state */ | |
305 | ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
306 | master->opp_table, | |
307 | state); | |
308 | if (unlikely(ret < 0)) | |
309 | goto err; | |
310 | ||
311 | master_state = ret; | |
312 | ||
313 | genpd_lock_nested(master, depth + 1); | |
314 | ||
315 | link->prev_performance_state = link->performance_state; | |
316 | link->performance_state = master_state; | |
317 | master_state = _genpd_reeval_performance_state(master, | |
318 | master_state); | |
319 | ret = _genpd_set_performance_state(master, master_state, depth + 1); | |
320 | if (ret) | |
321 | link->performance_state = link->prev_performance_state; | |
322 | ||
323 | genpd_unlock(master); | |
324 | ||
325 | if (ret) | |
326 | goto err; | |
327 | } | |
328 | ||
cd50c6d3 VK |
329 | ret = genpd->set_performance_state(genpd, state); |
330 | if (ret) | |
18edf49c | 331 | goto err; |
cd50c6d3 VK |
332 | |
333 | genpd->performance_state = state; | |
334 | return 0; | |
18edf49c VK |
335 | |
336 | err: | |
337 | /* Encountered an error, lets rollback */ | |
338 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, | |
339 | slave_node) { | |
340 | master = link->master; | |
341 | ||
342 | if (!master->set_performance_state) | |
343 | continue; | |
344 | ||
345 | genpd_lock_nested(master, depth + 1); | |
346 | ||
347 | master_state = link->prev_performance_state; | |
348 | link->performance_state = master_state; | |
349 | ||
350 | master_state = _genpd_reeval_performance_state(master, | |
351 | master_state); | |
352 | if (_genpd_set_performance_state(master, master_state, depth + 1)) { | |
353 | pr_err("%s: Failed to roll back to %d performance state\n", | |
354 | master->name, master_state); | |
355 | } | |
356 | ||
357 | genpd_unlock(master); | |
358 | } | |
359 | ||
360 | return ret; | |
cd50c6d3 VK |
361 | } |
362 | ||
42f6284a VK |
363 | /** |
364 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
365 | * domain. | |
366 | * | |
367 | * @dev: Device for which the performance-state needs to be set. | |
368 | * @state: Target performance state of the device. This can be set as 0 when the | |
369 | * device doesn't have any performance state constraints left (And so | |
370 | * the device wouldn't participate anymore to find the target | |
371 | * performance state of the genpd). | |
372 | * | |
373 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
374 | * while this routine is getting called. | |
375 | * | |
376 | * Returns 0 on success and negative error values on failures. | |
377 | */ | |
378 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
379 | { | |
380 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 381 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 382 | unsigned int prev; |
cd50c6d3 | 383 | int ret; |
42f6284a VK |
384 | |
385 | genpd = dev_to_genpd(dev); | |
386 | if (IS_ERR(genpd)) | |
387 | return -ENODEV; | |
388 | ||
389 | if (unlikely(!genpd->set_performance_state)) | |
390 | return -EINVAL; | |
391 | ||
392 | if (unlikely(!dev->power.subsys_data || | |
393 | !dev->power.subsys_data->domain_data)) { | |
394 | WARN_ON(1); | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | genpd_lock(genpd); | |
399 | ||
400 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
401 | prev = gpd_data->performance_state; | |
402 | gpd_data->performance_state = state; | |
403 | ||
cd50c6d3 | 404 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 405 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 406 | if (ret) |
68de2fe5 | 407 | gpd_data->performance_state = prev; |
42f6284a | 408 | |
42f6284a VK |
409 | genpd_unlock(genpd); |
410 | ||
411 | return ret; | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
414 | ||
86e12eac | 415 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 416 | { |
fc5cbf0c | 417 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
418 | ktime_t time_start; |
419 | s64 elapsed_ns; | |
420 | int ret; | |
421 | ||
422 | if (!genpd->power_on) | |
423 | return 0; | |
424 | ||
a4630c61 GU |
425 | if (!timed) |
426 | return genpd->power_on(genpd); | |
427 | ||
c8f0ea45 GU |
428 | time_start = ktime_get(); |
429 | ret = genpd->power_on(genpd); | |
430 | if (ret) | |
431 | return ret; | |
432 | ||
433 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 434 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
435 | return ret; |
436 | ||
fc5cbf0c | 437 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 438 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
439 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
440 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
441 | |
442 | return ret; | |
443 | } | |
444 | ||
86e12eac | 445 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 446 | { |
fc5cbf0c | 447 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
448 | ktime_t time_start; |
449 | s64 elapsed_ns; | |
450 | int ret; | |
451 | ||
452 | if (!genpd->power_off) | |
453 | return 0; | |
454 | ||
a4630c61 GU |
455 | if (!timed) |
456 | return genpd->power_off(genpd); | |
457 | ||
c8f0ea45 GU |
458 | time_start = ktime_get(); |
459 | ret = genpd->power_off(genpd); | |
460 | if (ret == -EBUSY) | |
461 | return ret; | |
462 | ||
463 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 464 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
465 | return ret; |
466 | ||
fc5cbf0c | 467 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 468 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
469 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
470 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
471 | |
472 | return ret; | |
473 | } | |
474 | ||
29e47e21 | 475 | /** |
86e12eac | 476 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 477 | * @genpd: PM domain to power off. |
29e47e21 | 478 | * |
86e12eac | 479 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
480 | * before. |
481 | */ | |
482 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
483 | { | |
484 | queue_work(pm_wq, &genpd->power_off_work); | |
485 | } | |
486 | ||
1f8728b7 UH |
487 | /** |
488 | * genpd_power_off - Remove power from a given PM domain. | |
489 | * @genpd: PM domain to power down. | |
3c64649d UH |
490 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
491 | * RPM status of the releated device is in an intermediate state, not yet turned | |
492 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
493 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
494 | * |
495 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
496 | * have been powered down, remove power from @genpd. | |
497 | */ | |
2da83545 UH |
498 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
499 | unsigned int depth) | |
1f8728b7 UH |
500 | { |
501 | struct pm_domain_data *pdd; | |
502 | struct gpd_link *link; | |
503 | unsigned int not_suspended = 0; | |
504 | ||
505 | /* | |
506 | * Do not try to power off the domain in the following situations: | |
507 | * (1) The domain is already in the "power off" state. | |
508 | * (2) System suspend is in progress. | |
509 | */ | |
41e2c8e0 | 510 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
511 | return 0; |
512 | ||
ffaa42e8 UH |
513 | /* |
514 | * Abort power off for the PM domain in the following situations: | |
515 | * (1) The domain is configured as always on. | |
516 | * (2) When the domain has a subdomain being powered on. | |
517 | */ | |
518 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
519 | return -EBUSY; |
520 | ||
521 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
522 | enum pm_qos_flags_status stat; | |
523 | ||
20f97caf | 524 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
525 | if (stat > PM_QOS_FLAGS_NONE) |
526 | return -EBUSY; | |
527 | ||
528 | /* | |
529 | * Do not allow PM domain to be powered off, when an IRQ safe | |
530 | * device is part of a non-IRQ safe domain. | |
531 | */ | |
532 | if (!pm_runtime_suspended(pdd->dev) || | |
533 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
534 | not_suspended++; | |
535 | } | |
536 | ||
3c64649d | 537 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
538 | return -EBUSY; |
539 | ||
540 | if (genpd->gov && genpd->gov->power_down_ok) { | |
541 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
542 | return -EAGAIN; | |
543 | } | |
544 | ||
2c9b7f87 UH |
545 | /* Default to shallowest state. */ |
546 | if (!genpd->gov) | |
547 | genpd->state_idx = 0; | |
548 | ||
1f8728b7 UH |
549 | if (genpd->power_off) { |
550 | int ret; | |
551 | ||
552 | if (atomic_read(&genpd->sd_count) > 0) | |
553 | return -EBUSY; | |
554 | ||
555 | /* | |
556 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
557 | * managed to call genpd_power_on() for the master yet after | |
558 | * incrementing it. In that case genpd_power_on() will wait | |
559 | * for us to drop the lock, so we can call .power_off() and let | |
560 | * the genpd_power_on() restore power for us (this shouldn't | |
561 | * happen very often). | |
562 | */ | |
563 | ret = _genpd_power_off(genpd, true); | |
564 | if (ret) | |
565 | return ret; | |
566 | } | |
567 | ||
568 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 569 | genpd_update_accounting(genpd); |
1f8728b7 UH |
570 | |
571 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
572 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
573 | genpd_lock_nested(link->master, depth + 1); |
574 | genpd_power_off(link->master, false, depth + 1); | |
575 | genpd_unlock(link->master); | |
1f8728b7 UH |
576 | } |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
5248051b | 581 | /** |
86e12eac | 582 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 583 | * @genpd: PM domain to power up. |
0106ef51 | 584 | * @depth: nesting count for lockdep. |
5248051b | 585 | * |
5063ce15 | 586 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
587 | * resume a device belonging to it. |
588 | */ | |
86e12eac | 589 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 590 | { |
5063ce15 | 591 | struct gpd_link *link; |
5248051b RW |
592 | int ret = 0; |
593 | ||
41e2c8e0 | 594 | if (genpd_status_on(genpd)) |
3f241775 | 595 | return 0; |
5248051b | 596 | |
5063ce15 RW |
597 | /* |
598 | * The list is guaranteed not to change while the loop below is being | |
599 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
600 | * with it. | |
601 | */ | |
602 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
603 | struct generic_pm_domain *master = link->master; |
604 | ||
605 | genpd_sd_counter_inc(master); | |
606 | ||
35241d12 | 607 | genpd_lock_nested(master, depth + 1); |
86e12eac | 608 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 609 | genpd_unlock(master); |
5248051b | 610 | |
5063ce15 | 611 | if (ret) { |
0106ef51 | 612 | genpd_sd_counter_dec(master); |
9e08cf42 | 613 | goto err; |
5063ce15 | 614 | } |
5248051b RW |
615 | } |
616 | ||
86e12eac | 617 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
618 | if (ret) |
619 | goto err; | |
5248051b | 620 | |
ba2bbfbf | 621 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
622 | genpd_update_accounting(genpd); |
623 | ||
3f241775 | 624 | return 0; |
9e08cf42 RW |
625 | |
626 | err: | |
29e47e21 UH |
627 | list_for_each_entry_continue_reverse(link, |
628 | &genpd->slave_links, | |
629 | slave_node) { | |
5063ce15 | 630 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
631 | genpd_lock_nested(link->master, depth + 1); |
632 | genpd_power_off(link->master, false, depth + 1); | |
633 | genpd_unlock(link->master); | |
29e47e21 | 634 | } |
9e08cf42 | 635 | |
3f241775 RW |
636 | return ret; |
637 | } | |
638 | ||
6ff7bb0d RW |
639 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
640 | unsigned long val, void *ptr) | |
641 | { | |
642 | struct generic_pm_domain_data *gpd_data; | |
643 | struct device *dev; | |
644 | ||
645 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 646 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
647 | |
648 | for (;;) { | |
649 | struct generic_pm_domain *genpd; | |
650 | struct pm_domain_data *pdd; | |
651 | ||
652 | spin_lock_irq(&dev->power.lock); | |
653 | ||
654 | pdd = dev->power.subsys_data ? | |
655 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 656 | if (pdd) { |
6ff7bb0d RW |
657 | to_gpd_data(pdd)->td.constraint_changed = true; |
658 | genpd = dev_to_genpd(dev); | |
659 | } else { | |
660 | genpd = ERR_PTR(-ENODATA); | |
661 | } | |
662 | ||
663 | spin_unlock_irq(&dev->power.lock); | |
664 | ||
665 | if (!IS_ERR(genpd)) { | |
35241d12 | 666 | genpd_lock(genpd); |
6ff7bb0d | 667 | genpd->max_off_time_changed = true; |
35241d12 | 668 | genpd_unlock(genpd); |
6ff7bb0d RW |
669 | } |
670 | ||
671 | dev = dev->parent; | |
672 | if (!dev || dev->power.ignore_children) | |
673 | break; | |
674 | } | |
675 | ||
676 | return NOTIFY_DONE; | |
677 | } | |
678 | ||
f721889f RW |
679 | /** |
680 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
681 | * @work: Work structure used for scheduling the execution of this function. | |
682 | */ | |
683 | static void genpd_power_off_work_fn(struct work_struct *work) | |
684 | { | |
685 | struct generic_pm_domain *genpd; | |
686 | ||
687 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
688 | ||
35241d12 | 689 | genpd_lock(genpd); |
2da83545 | 690 | genpd_power_off(genpd, false, 0); |
35241d12 | 691 | genpd_unlock(genpd); |
f721889f RW |
692 | } |
693 | ||
54eeddbf UH |
694 | /** |
695 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
696 | * @dev: Device to handle. | |
697 | */ | |
698 | static int __genpd_runtime_suspend(struct device *dev) | |
699 | { | |
700 | int (*cb)(struct device *__dev); | |
701 | ||
702 | if (dev->type && dev->type->pm) | |
703 | cb = dev->type->pm->runtime_suspend; | |
704 | else if (dev->class && dev->class->pm) | |
705 | cb = dev->class->pm->runtime_suspend; | |
706 | else if (dev->bus && dev->bus->pm) | |
707 | cb = dev->bus->pm->runtime_suspend; | |
708 | else | |
709 | cb = NULL; | |
710 | ||
711 | if (!cb && dev->driver && dev->driver->pm) | |
712 | cb = dev->driver->pm->runtime_suspend; | |
713 | ||
714 | return cb ? cb(dev) : 0; | |
715 | } | |
716 | ||
717 | /** | |
718 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
719 | * @dev: Device to handle. | |
720 | */ | |
721 | static int __genpd_runtime_resume(struct device *dev) | |
722 | { | |
723 | int (*cb)(struct device *__dev); | |
724 | ||
725 | if (dev->type && dev->type->pm) | |
726 | cb = dev->type->pm->runtime_resume; | |
727 | else if (dev->class && dev->class->pm) | |
728 | cb = dev->class->pm->runtime_resume; | |
729 | else if (dev->bus && dev->bus->pm) | |
730 | cb = dev->bus->pm->runtime_resume; | |
731 | else | |
732 | cb = NULL; | |
733 | ||
734 | if (!cb && dev->driver && dev->driver->pm) | |
735 | cb = dev->driver->pm->runtime_resume; | |
736 | ||
737 | return cb ? cb(dev) : 0; | |
738 | } | |
739 | ||
f721889f | 740 | /** |
795bd2e7 | 741 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
742 | * @dev: Device to suspend. |
743 | * | |
744 | * Carry out a runtime suspend of a device under the assumption that its | |
745 | * pm_domain field points to the domain member of an object of type | |
746 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
747 | */ | |
795bd2e7 | 748 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
749 | { |
750 | struct generic_pm_domain *genpd; | |
9df3921e | 751 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 752 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 753 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
754 | ktime_t time_start; |
755 | s64 elapsed_ns; | |
d5e4cbfe | 756 | int ret; |
f721889f RW |
757 | |
758 | dev_dbg(dev, "%s()\n", __func__); | |
759 | ||
5248051b RW |
760 | genpd = dev_to_genpd(dev); |
761 | if (IS_ERR(genpd)) | |
f721889f RW |
762 | return -EINVAL; |
763 | ||
ffe12855 UH |
764 | /* |
765 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
766 | * callbacks for other purposes than runtime PM. In those scenarios | |
767 | * runtime PM is disabled. Under these circumstances, we shall skip | |
768 | * validating/measuring the PM QoS latency. | |
769 | */ | |
9df3921e UH |
770 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
771 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
772 | return -EBUSY; |
773 | ||
2b1d88cd | 774 | /* Measure suspend latency. */ |
d33d5a6c | 775 | time_start = 0; |
ffe12855 UH |
776 | if (runtime_pm) |
777 | time_start = ktime_get(); | |
2b1d88cd | 778 | |
54eeddbf | 779 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
780 | if (ret) |
781 | return ret; | |
17b75eca | 782 | |
2b1d88cd | 783 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 784 | if (ret) { |
54eeddbf | 785 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
786 | return ret; |
787 | } | |
788 | ||
2b1d88cd | 789 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
790 | if (runtime_pm) { |
791 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
792 | if (elapsed_ns > td->suspend_latency_ns) { | |
793 | td->suspend_latency_ns = elapsed_ns; | |
794 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
795 | elapsed_ns); | |
796 | genpd->max_off_time_changed = true; | |
797 | td->constraint_changed = true; | |
798 | } | |
2b1d88cd UH |
799 | } |
800 | ||
0aa2a221 | 801 | /* |
d716f479 LI |
802 | * If power.irq_safe is set, this routine may be run with |
803 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 804 | */ |
d716f479 | 805 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
806 | return 0; |
807 | ||
35241d12 | 808 | genpd_lock(genpd); |
2da83545 | 809 | genpd_power_off(genpd, true, 0); |
35241d12 | 810 | genpd_unlock(genpd); |
f721889f RW |
811 | |
812 | return 0; | |
813 | } | |
814 | ||
f721889f | 815 | /** |
795bd2e7 | 816 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
817 | * @dev: Device to resume. |
818 | * | |
819 | * Carry out a runtime resume of a device under the assumption that its | |
820 | * pm_domain field points to the domain member of an object of type | |
821 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
822 | */ | |
795bd2e7 | 823 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
824 | { |
825 | struct generic_pm_domain *genpd; | |
2b1d88cd | 826 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 827 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
828 | ktime_t time_start; |
829 | s64 elapsed_ns; | |
f721889f | 830 | int ret; |
ba2bbfbf | 831 | bool timed = true; |
f721889f RW |
832 | |
833 | dev_dbg(dev, "%s()\n", __func__); | |
834 | ||
5248051b RW |
835 | genpd = dev_to_genpd(dev); |
836 | if (IS_ERR(genpd)) | |
f721889f RW |
837 | return -EINVAL; |
838 | ||
d716f479 LI |
839 | /* |
840 | * As we don't power off a non IRQ safe domain, which holds | |
841 | * an IRQ safe device, we don't need to restore power to it. | |
842 | */ | |
843 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
844 | timed = false; |
845 | goto out; | |
846 | } | |
0aa2a221 | 847 | |
35241d12 | 848 | genpd_lock(genpd); |
86e12eac | 849 | ret = genpd_power_on(genpd, 0); |
35241d12 | 850 | genpd_unlock(genpd); |
c6d22b37 | 851 | |
ba2bbfbf UH |
852 | if (ret) |
853 | return ret; | |
c6d22b37 | 854 | |
ba2bbfbf | 855 | out: |
2b1d88cd | 856 | /* Measure resume latency. */ |
ab51e6ba | 857 | time_start = 0; |
ffe12855 | 858 | if (timed && runtime_pm) |
2b1d88cd UH |
859 | time_start = ktime_get(); |
860 | ||
076395ca LP |
861 | ret = genpd_start_dev(genpd, dev); |
862 | if (ret) | |
863 | goto err_poweroff; | |
864 | ||
54eeddbf | 865 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
866 | if (ret) |
867 | goto err_stop; | |
2b1d88cd UH |
868 | |
869 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 870 | if (timed && runtime_pm) { |
2b1d88cd UH |
871 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
872 | if (elapsed_ns > td->resume_latency_ns) { | |
873 | td->resume_latency_ns = elapsed_ns; | |
874 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
875 | elapsed_ns); | |
876 | genpd->max_off_time_changed = true; | |
877 | td->constraint_changed = true; | |
878 | } | |
879 | } | |
17b75eca | 880 | |
f721889f | 881 | return 0; |
076395ca LP |
882 | |
883 | err_stop: | |
884 | genpd_stop_dev(genpd, dev); | |
885 | err_poweroff: | |
d716f479 LI |
886 | if (!pm_runtime_is_irq_safe(dev) || |
887 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 888 | genpd_lock(genpd); |
2da83545 | 889 | genpd_power_off(genpd, true, 0); |
35241d12 | 890 | genpd_unlock(genpd); |
076395ca LP |
891 | } |
892 | ||
893 | return ret; | |
f721889f RW |
894 | } |
895 | ||
39ac5ba5 TB |
896 | static bool pd_ignore_unused; |
897 | static int __init pd_ignore_unused_setup(char *__unused) | |
898 | { | |
899 | pd_ignore_unused = true; | |
900 | return 1; | |
901 | } | |
902 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
903 | ||
17f2ae7f | 904 | /** |
86e12eac | 905 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 906 | */ |
86e12eac | 907 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
908 | { |
909 | struct generic_pm_domain *genpd; | |
910 | ||
39ac5ba5 TB |
911 | if (pd_ignore_unused) { |
912 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 913 | return 0; |
39ac5ba5 TB |
914 | } |
915 | ||
17f2ae7f RW |
916 | mutex_lock(&gpd_list_lock); |
917 | ||
918 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
919 | genpd_queue_power_off_work(genpd); | |
920 | ||
921 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 922 | |
2fe71dcd UH |
923 | return 0; |
924 | } | |
86e12eac | 925 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 926 | |
0159ec67 | 927 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 928 | |
9e9704ea | 929 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 930 | { |
895b31f3 | 931 | const struct generic_pm_domain *gpd; |
77f827de RW |
932 | |
933 | if (IS_ERR_OR_NULL(genpd)) | |
934 | return false; | |
935 | ||
936 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
937 | if (gpd == genpd) | |
938 | return true; | |
939 | ||
940 | return false; | |
941 | } | |
942 | ||
0159ec67 JH |
943 | #endif |
944 | ||
945 | #ifdef CONFIG_PM_SLEEP | |
946 | ||
596ba34b | 947 | /** |
86e12eac | 948 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 949 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
950 | * @use_lock: use the lock. |
951 | * @depth: nesting count for lockdep. | |
596ba34b RW |
952 | * |
953 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 954 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 955 | * |
77f827de | 956 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
957 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
958 | * these cases the lock must be held. | |
596ba34b | 959 | */ |
0883ac03 UH |
960 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
961 | unsigned int depth) | |
596ba34b | 962 | { |
5063ce15 | 963 | struct gpd_link *link; |
596ba34b | 964 | |
ffaa42e8 | 965 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
966 | return; |
967 | ||
c4bb3160 RW |
968 | if (genpd->suspended_count != genpd->device_count |
969 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
970 | return; |
971 | ||
fc5cbf0c AH |
972 | /* Choose the deepest state when suspending */ |
973 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
974 | if (_genpd_power_off(genpd, false)) |
975 | return; | |
596ba34b | 976 | |
17b75eca | 977 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
978 | |
979 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
980 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
981 | |
982 | if (use_lock) | |
983 | genpd_lock_nested(link->master, depth + 1); | |
984 | ||
985 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
986 | ||
987 | if (use_lock) | |
988 | genpd_unlock(link->master); | |
596ba34b RW |
989 | } |
990 | } | |
991 | ||
802d8b49 | 992 | /** |
86e12eac | 993 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 994 | * @genpd: PM domain to power on. |
0883ac03 UH |
995 | * @use_lock: use the lock. |
996 | * @depth: nesting count for lockdep. | |
802d8b49 | 997 | * |
77f827de | 998 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
999 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1000 | * these cases the lock must be held. | |
802d8b49 | 1001 | */ |
0883ac03 UH |
1002 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1003 | unsigned int depth) | |
802d8b49 RW |
1004 | { |
1005 | struct gpd_link *link; | |
1006 | ||
41e2c8e0 | 1007 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1008 | return; |
1009 | ||
1010 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 1011 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
1012 | |
1013 | if (use_lock) | |
1014 | genpd_lock_nested(link->master, depth + 1); | |
1015 | ||
1016 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
1017 | ||
1018 | if (use_lock) | |
1019 | genpd_unlock(link->master); | |
802d8b49 RW |
1020 | } |
1021 | ||
86e12eac | 1022 | _genpd_power_on(genpd, false); |
802d8b49 RW |
1023 | |
1024 | genpd->status = GPD_STATE_ACTIVE; | |
1025 | } | |
1026 | ||
4ecd6e65 RW |
1027 | /** |
1028 | * resume_needed - Check whether to resume a device before system suspend. | |
1029 | * @dev: Device to check. | |
1030 | * @genpd: PM domain the device belongs to. | |
1031 | * | |
1032 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1033 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1034 | * to wake up the system and it has to remain active for this purpose while the |
1035 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1036 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1037 | * by itself (those signals are generated on its behalf by other parts of the | |
1038 | * system). In the latter case it may be necessary to reconfigure the device's | |
1039 | * wakeup settings during system suspend, because it may have been set up to | |
1040 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1041 | * Return 'true' in either of the above cases. | |
1042 | */ | |
d8600c8b KK |
1043 | static bool resume_needed(struct device *dev, |
1044 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1045 | { |
1046 | bool active_wakeup; | |
1047 | ||
1048 | if (!device_can_wakeup(dev)) | |
1049 | return false; | |
1050 | ||
d0af45f1 | 1051 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1052 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1053 | } | |
1054 | ||
596ba34b | 1055 | /** |
9e9704ea | 1056 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1057 | * @dev: Device to start the transition of. |
1058 | * | |
1059 | * Start a power transition of a device (during a system-wide power transition) | |
1060 | * under the assumption that its pm_domain field points to the domain member of | |
1061 | * an object of type struct generic_pm_domain representing a PM domain | |
1062 | * consisting of I/O devices. | |
1063 | */ | |
9e9704ea | 1064 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1065 | { |
1066 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1067 | int ret; |
596ba34b RW |
1068 | |
1069 | dev_dbg(dev, "%s()\n", __func__); | |
1070 | ||
1071 | genpd = dev_to_genpd(dev); | |
1072 | if (IS_ERR(genpd)) | |
1073 | return -EINVAL; | |
1074 | ||
17b75eca RW |
1075 | /* |
1076 | * If a wakeup request is pending for the device, it should be woken up | |
1077 | * at this point and a system wakeup event should be reported if it's | |
1078 | * set up to wake up the system from sleep states. | |
1079 | */ | |
4ecd6e65 RW |
1080 | if (resume_needed(dev, genpd)) |
1081 | pm_runtime_resume(dev); | |
1082 | ||
35241d12 | 1083 | genpd_lock(genpd); |
596ba34b | 1084 | |
39dd0f23 | 1085 | if (genpd->prepared_count++ == 0) |
65533bbf | 1086 | genpd->suspended_count = 0; |
17b75eca | 1087 | |
35241d12 | 1088 | genpd_unlock(genpd); |
596ba34b | 1089 | |
b6c10c84 | 1090 | ret = pm_generic_prepare(dev); |
5241ab40 | 1091 | if (ret < 0) { |
35241d12 | 1092 | genpd_lock(genpd); |
b6c10c84 | 1093 | |
39dd0f23 | 1094 | genpd->prepared_count--; |
b6c10c84 | 1095 | |
35241d12 | 1096 | genpd_unlock(genpd); |
b6c10c84 | 1097 | } |
17b75eca | 1098 | |
5241ab40 UH |
1099 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1100 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1101 | } |
1102 | ||
0496c8ae | 1103 | /** |
10da6542 MP |
1104 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1105 | * I/O pm domain. | |
0496c8ae | 1106 | * @dev: Device to suspend. |
10da6542 | 1107 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1108 | * |
1109 | * Stop the device and remove power from the domain if all devices in it have | |
1110 | * been stopped. | |
1111 | */ | |
10da6542 | 1112 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1113 | { |
1114 | struct generic_pm_domain *genpd; | |
a935424b | 1115 | int ret = 0; |
0496c8ae | 1116 | |
0496c8ae RW |
1117 | genpd = dev_to_genpd(dev); |
1118 | if (IS_ERR(genpd)) | |
1119 | return -EINVAL; | |
596ba34b | 1120 | |
10da6542 MP |
1121 | if (poweroff) |
1122 | ret = pm_generic_poweroff_noirq(dev); | |
1123 | else | |
1124 | ret = pm_generic_suspend_noirq(dev); | |
1125 | if (ret) | |
1126 | return ret; | |
1127 | ||
a935424b UH |
1128 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1129 | return 0; | |
1130 | ||
17218e00 RW |
1131 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1132 | !pm_runtime_status_suspended(dev)) { | |
1133 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1134 | if (ret) { |
1135 | if (poweroff) | |
1136 | pm_generic_restore_noirq(dev); | |
1137 | else | |
1138 | pm_generic_resume_noirq(dev); | |
122a2237 | 1139 | return ret; |
a935424b | 1140 | } |
122a2237 UH |
1141 | } |
1142 | ||
0883ac03 | 1143 | genpd_lock(genpd); |
596ba34b | 1144 | genpd->suspended_count++; |
0883ac03 UH |
1145 | genpd_sync_power_off(genpd, true, 0); |
1146 | genpd_unlock(genpd); | |
596ba34b RW |
1147 | |
1148 | return 0; | |
1149 | } | |
1150 | ||
10da6542 | 1151 | /** |
9e9704ea | 1152 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1153 | * @dev: Device to suspend. |
1154 | * | |
1155 | * Stop the device and remove power from the domain if all devices in it have | |
1156 | * been stopped. | |
1157 | */ | |
9e9704ea | 1158 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1159 | { |
1160 | dev_dbg(dev, "%s()\n", __func__); | |
1161 | ||
1162 | return genpd_finish_suspend(dev, false); | |
1163 | } | |
1164 | ||
596ba34b | 1165 | /** |
9e9704ea | 1166 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1167 | * @dev: Device to resume. |
1168 | * | |
0496c8ae | 1169 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1170 | */ |
9e9704ea | 1171 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1172 | { |
1173 | struct generic_pm_domain *genpd; | |
a935424b | 1174 | int ret; |
596ba34b RW |
1175 | |
1176 | dev_dbg(dev, "%s()\n", __func__); | |
1177 | ||
1178 | genpd = dev_to_genpd(dev); | |
1179 | if (IS_ERR(genpd)) | |
1180 | return -EINVAL; | |
1181 | ||
d0af45f1 | 1182 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1183 | return pm_generic_resume_noirq(dev); |
596ba34b | 1184 | |
0883ac03 UH |
1185 | genpd_lock(genpd); |
1186 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1187 | genpd->suspended_count--; |
0883ac03 | 1188 | genpd_unlock(genpd); |
596ba34b | 1189 | |
17218e00 RW |
1190 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1191 | !pm_runtime_status_suspended(dev)) { | |
1192 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1193 | if (ret) |
1194 | return ret; | |
1195 | } | |
122a2237 | 1196 | |
a935424b | 1197 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1198 | } |
1199 | ||
0496c8ae | 1200 | /** |
9e9704ea | 1201 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1202 | * @dev: Device to freeze. |
1203 | * | |
1204 | * Carry out a late freeze of a device under the assumption that its | |
1205 | * pm_domain field points to the domain member of an object of type | |
1206 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1207 | * devices. | |
1208 | */ | |
9e9704ea | 1209 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1210 | { |
d8600c8b | 1211 | const struct generic_pm_domain *genpd; |
122a2237 | 1212 | int ret = 0; |
596ba34b RW |
1213 | |
1214 | dev_dbg(dev, "%s()\n", __func__); | |
1215 | ||
1216 | genpd = dev_to_genpd(dev); | |
1217 | if (IS_ERR(genpd)) | |
1218 | return -EINVAL; | |
1219 | ||
10da6542 MP |
1220 | ret = pm_generic_freeze_noirq(dev); |
1221 | if (ret) | |
1222 | return ret; | |
1223 | ||
17218e00 RW |
1224 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1225 | !pm_runtime_status_suspended(dev)) | |
1226 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1227 | |
1228 | return ret; | |
0496c8ae | 1229 | } |
596ba34b | 1230 | |
0496c8ae | 1231 | /** |
9e9704ea | 1232 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1233 | * @dev: Device to thaw. |
1234 | * | |
1235 | * Start the device, unless power has been removed from the domain already | |
1236 | * before the system transition. | |
1237 | */ | |
9e9704ea | 1238 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1239 | { |
d8600c8b | 1240 | const struct generic_pm_domain *genpd; |
122a2237 | 1241 | int ret = 0; |
596ba34b | 1242 | |
0496c8ae | 1243 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1244 | |
0496c8ae RW |
1245 | genpd = dev_to_genpd(dev); |
1246 | if (IS_ERR(genpd)) | |
1247 | return -EINVAL; | |
1248 | ||
17218e00 RW |
1249 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1250 | !pm_runtime_status_suspended(dev)) { | |
1251 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1252 | if (ret) |
1253 | return ret; | |
1254 | } | |
122a2237 | 1255 | |
10da6542 MP |
1256 | return pm_generic_thaw_noirq(dev); |
1257 | } | |
1258 | ||
1259 | /** | |
9e9704ea | 1260 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1261 | * I/O PM domain. |
1262 | * @dev: Device to poweroff. | |
1263 | * | |
1264 | * Stop the device and remove power from the domain if all devices in it have | |
1265 | * been stopped. | |
1266 | */ | |
9e9704ea | 1267 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1268 | { |
1269 | dev_dbg(dev, "%s()\n", __func__); | |
1270 | ||
1271 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1272 | } |
1273 | ||
596ba34b | 1274 | /** |
9e9704ea | 1275 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1276 | * @dev: Device to resume. |
1277 | * | |
0496c8ae RW |
1278 | * Make sure the domain will be in the same power state as before the |
1279 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1280 | */ |
9e9704ea | 1281 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1282 | { |
1283 | struct generic_pm_domain *genpd; | |
122a2237 | 1284 | int ret = 0; |
596ba34b RW |
1285 | |
1286 | dev_dbg(dev, "%s()\n", __func__); | |
1287 | ||
1288 | genpd = dev_to_genpd(dev); | |
1289 | if (IS_ERR(genpd)) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | /* | |
65533bbf RW |
1293 | * At this point suspended_count == 0 means we are being run for the |
1294 | * first time for the given domain in the present cycle. | |
596ba34b | 1295 | */ |
0883ac03 | 1296 | genpd_lock(genpd); |
39dd0f23 | 1297 | if (genpd->suspended_count++ == 0) |
596ba34b | 1298 | /* |
65533bbf | 1299 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1300 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1301 | * so that it tries to power it on in case it was really off. |
596ba34b | 1302 | */ |
65533bbf | 1303 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1304 | |
0883ac03 UH |
1305 | genpd_sync_power_on(genpd, true, 0); |
1306 | genpd_unlock(genpd); | |
596ba34b | 1307 | |
17218e00 RW |
1308 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1309 | !pm_runtime_status_suspended(dev)) { | |
1310 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1311 | if (ret) |
1312 | return ret; | |
1313 | } | |
122a2237 | 1314 | |
10da6542 | 1315 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1316 | } |
1317 | ||
1318 | /** | |
9e9704ea | 1319 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1320 | * @dev: Device to complete the transition of. |
1321 | * | |
1322 | * Complete a power transition of a device (during a system-wide power | |
1323 | * transition) under the assumption that its pm_domain field points to the | |
1324 | * domain member of an object of type struct generic_pm_domain representing | |
1325 | * a power domain consisting of I/O devices. | |
1326 | */ | |
9e9704ea | 1327 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1328 | { |
1329 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1330 | |
1331 | dev_dbg(dev, "%s()\n", __func__); | |
1332 | ||
1333 | genpd = dev_to_genpd(dev); | |
1334 | if (IS_ERR(genpd)) | |
1335 | return; | |
1336 | ||
4d23a5e8 UH |
1337 | pm_generic_complete(dev); |
1338 | ||
35241d12 | 1339 | genpd_lock(genpd); |
596ba34b | 1340 | |
39dd0f23 | 1341 | genpd->prepared_count--; |
4d23a5e8 UH |
1342 | if (!genpd->prepared_count) |
1343 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1344 | |
35241d12 | 1345 | genpd_unlock(genpd); |
596ba34b RW |
1346 | } |
1347 | ||
77f827de | 1348 | /** |
d47e6464 | 1349 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1350 | * @dev: Device that normally is marked as "always on" to switch power for. |
1351 | * | |
1352 | * This routine may only be called during the system core (syscore) suspend or | |
1353 | * resume phase for devices whose "always on" flags are set. | |
1354 | */ | |
d47e6464 | 1355 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1356 | { |
1357 | struct generic_pm_domain *genpd; | |
1358 | ||
23c6d2c7 | 1359 | genpd = dev_to_genpd(dev); |
9e9704ea | 1360 | if (!genpd_present(genpd)) |
77f827de RW |
1361 | return; |
1362 | ||
1363 | if (suspend) { | |
1364 | genpd->suspended_count++; | |
0883ac03 | 1365 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1366 | } else { |
0883ac03 | 1367 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1368 | genpd->suspended_count--; |
1369 | } | |
1370 | } | |
d47e6464 UH |
1371 | |
1372 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1373 | { | |
1374 | genpd_syscore_switch(dev, true); | |
1375 | } | |
1376 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1377 | ||
1378 | void pm_genpd_syscore_poweron(struct device *dev) | |
1379 | { | |
1380 | genpd_syscore_switch(dev, false); | |
1381 | } | |
1382 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1383 | |
d30d819d | 1384 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1385 | |
9e9704ea UH |
1386 | #define genpd_prepare NULL |
1387 | #define genpd_suspend_noirq NULL | |
1388 | #define genpd_resume_noirq NULL | |
1389 | #define genpd_freeze_noirq NULL | |
1390 | #define genpd_thaw_noirq NULL | |
1391 | #define genpd_poweroff_noirq NULL | |
1392 | #define genpd_restore_noirq NULL | |
1393 | #define genpd_complete NULL | |
596ba34b RW |
1394 | |
1395 | #endif /* CONFIG_PM_SLEEP */ | |
1396 | ||
f104e1e5 | 1397 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
f104e1e5 | 1398 | struct gpd_timing_data *td) |
1d5fcfec RW |
1399 | { |
1400 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1401 | int ret; |
1402 | ||
1403 | ret = dev_pm_get_subsys_data(dev); | |
1404 | if (ret) | |
1405 | return ERR_PTR(ret); | |
1d5fcfec RW |
1406 | |
1407 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1408 | if (!gpd_data) { |
1409 | ret = -ENOMEM; | |
1410 | goto err_put; | |
1411 | } | |
1d5fcfec | 1412 | |
f104e1e5 UH |
1413 | if (td) |
1414 | gpd_data->td = *td; | |
1415 | ||
1416 | gpd_data->base.dev = dev; | |
f104e1e5 | 1417 | gpd_data->td.constraint_changed = true; |
0759e80b | 1418 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1419 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1420 | ||
1421 | spin_lock_irq(&dev->power.lock); | |
1422 | ||
1423 | if (dev->power.subsys_data->domain_data) { | |
1424 | ret = -EINVAL; | |
1425 | goto err_free; | |
1426 | } | |
1427 | ||
1428 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1429 | |
1430 | spin_unlock_irq(&dev->power.lock); | |
1431 | ||
1d5fcfec | 1432 | return gpd_data; |
3e235685 | 1433 | |
f104e1e5 UH |
1434 | err_free: |
1435 | spin_unlock_irq(&dev->power.lock); | |
1436 | kfree(gpd_data); | |
3e235685 UH |
1437 | err_put: |
1438 | dev_pm_put_subsys_data(dev); | |
1439 | return ERR_PTR(ret); | |
1d5fcfec RW |
1440 | } |
1441 | ||
49d400c7 UH |
1442 | static void genpd_free_dev_data(struct device *dev, |
1443 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1444 | { |
f104e1e5 UH |
1445 | spin_lock_irq(&dev->power.lock); |
1446 | ||
f104e1e5 UH |
1447 | dev->power.subsys_data->domain_data = NULL; |
1448 | ||
1449 | spin_unlock_irq(&dev->power.lock); | |
1450 | ||
1d5fcfec | 1451 | kfree(gpd_data); |
3e235685 | 1452 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1453 | } |
1454 | ||
19efa5ff JH |
1455 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1456 | struct gpd_timing_data *td) | |
f721889f | 1457 | { |
c0356db7 | 1458 | struct generic_pm_domain_data *gpd_data; |
b56d9c91 | 1459 | int ret; |
f721889f RW |
1460 | |
1461 | dev_dbg(dev, "%s()\n", __func__); | |
1462 | ||
1463 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1464 | return -EINVAL; | |
1465 | ||
96c1bf68 | 1466 | gpd_data = genpd_alloc_dev_data(dev, td); |
3e235685 UH |
1467 | if (IS_ERR(gpd_data)) |
1468 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1469 | |
35241d12 | 1470 | genpd_lock(genpd); |
f721889f | 1471 | |
b472c2fa UH |
1472 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1473 | if (ret) | |
1474 | goto out; | |
d79b6fe1 | 1475 | |
975e83cf SH |
1476 | dev_pm_domain_set(dev, &genpd->domain); |
1477 | ||
14b53064 UH |
1478 | genpd->device_count++; |
1479 | genpd->max_off_time_changed = true; | |
1480 | ||
1d5fcfec | 1481 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1482 | |
f721889f | 1483 | out: |
35241d12 | 1484 | genpd_unlock(genpd); |
f721889f | 1485 | |
c0356db7 UH |
1486 | if (ret) |
1487 | genpd_free_dev_data(dev, gpd_data); | |
1488 | else | |
1489 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1490 | |
f721889f RW |
1491 | return ret; |
1492 | } | |
19efa5ff JH |
1493 | |
1494 | /** | |
1a7a6707 | 1495 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1496 | * @genpd: PM domain to add the device to. |
1497 | * @dev: Device to be added. | |
19efa5ff | 1498 | */ |
1a7a6707 | 1499 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1500 | { |
1501 | int ret; | |
1502 | ||
1503 | mutex_lock(&gpd_list_lock); | |
1a7a6707 | 1504 | ret = genpd_add_device(genpd, dev, NULL); |
19efa5ff JH |
1505 | mutex_unlock(&gpd_list_lock); |
1506 | ||
1507 | return ret; | |
1508 | } | |
1a7a6707 | 1509 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1510 | |
85168d56 UH |
1511 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1512 | struct device *dev) | |
f721889f | 1513 | { |
6ff7bb0d | 1514 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1515 | struct pm_domain_data *pdd; |
efa69025 | 1516 | int ret = 0; |
f721889f RW |
1517 | |
1518 | dev_dbg(dev, "%s()\n", __func__); | |
1519 | ||
c0356db7 UH |
1520 | pdd = dev->power.subsys_data->domain_data; |
1521 | gpd_data = to_gpd_data(pdd); | |
1522 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1523 | ||
35241d12 | 1524 | genpd_lock(genpd); |
f721889f | 1525 | |
596ba34b RW |
1526 | if (genpd->prepared_count > 0) { |
1527 | ret = -EAGAIN; | |
1528 | goto out; | |
1529 | } | |
1530 | ||
6ff7bb0d RW |
1531 | genpd->device_count--; |
1532 | genpd->max_off_time_changed = true; | |
1533 | ||
d79b6fe1 | 1534 | if (genpd->detach_dev) |
c16561e8 | 1535 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1536 | |
975e83cf SH |
1537 | dev_pm_domain_set(dev, NULL); |
1538 | ||
efa69025 | 1539 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1540 | |
35241d12 | 1541 | genpd_unlock(genpd); |
6ff7bb0d | 1542 | |
c1dbe2fb | 1543 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1544 | |
6ff7bb0d | 1545 | return 0; |
f721889f | 1546 | |
596ba34b | 1547 | out: |
35241d12 | 1548 | genpd_unlock(genpd); |
c0356db7 | 1549 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1550 | |
1551 | return ret; | |
1552 | } | |
85168d56 UH |
1553 | |
1554 | /** | |
1555 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1556 | * @dev: Device to be removed. |
1557 | */ | |
924f4486 | 1558 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1559 | { |
924f4486 UH |
1560 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1561 | ||
1562 | if (!genpd) | |
85168d56 UH |
1563 | return -EINVAL; |
1564 | ||
1565 | return genpd_remove_device(genpd, dev); | |
1566 | } | |
24c96dc7 | 1567 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1568 | |
19efa5ff JH |
1569 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1570 | struct generic_pm_domain *subdomain) | |
f721889f | 1571 | { |
2547923d | 1572 | struct gpd_link *link, *itr; |
f721889f RW |
1573 | int ret = 0; |
1574 | ||
fb7268be RW |
1575 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1576 | || genpd == subdomain) | |
f721889f RW |
1577 | return -EINVAL; |
1578 | ||
d716f479 LI |
1579 | /* |
1580 | * If the domain can be powered on/off in an IRQ safe | |
1581 | * context, ensure that the subdomain can also be | |
1582 | * powered on/off in that context. | |
1583 | */ | |
1584 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1585 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1586 | genpd->name, subdomain->name); |
1587 | return -EINVAL; | |
1588 | } | |
1589 | ||
2547923d LI |
1590 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1591 | if (!link) | |
1592 | return -ENOMEM; | |
1593 | ||
35241d12 LI |
1594 | genpd_lock(subdomain); |
1595 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1596 | |
41e2c8e0 | 1597 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1598 | ret = -EINVAL; |
1599 | goto out; | |
1600 | } | |
1601 | ||
2547923d LI |
1602 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1603 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1604 | ret = -EINVAL; |
1605 | goto out; | |
1606 | } | |
1607 | } | |
1608 | ||
5063ce15 RW |
1609 | link->master = genpd; |
1610 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1611 | link->slave = subdomain; |
1612 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1613 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1614 | genpd_sd_counter_inc(genpd); |
f721889f | 1615 | |
f721889f | 1616 | out: |
35241d12 LI |
1617 | genpd_unlock(genpd); |
1618 | genpd_unlock(subdomain); | |
2547923d LI |
1619 | if (ret) |
1620 | kfree(link); | |
f721889f RW |
1621 | return ret; |
1622 | } | |
19efa5ff JH |
1623 | |
1624 | /** | |
1625 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1626 | * @genpd: Master PM domain to add the subdomain to. | |
1627 | * @subdomain: Subdomain to be added. | |
1628 | */ | |
1629 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1630 | struct generic_pm_domain *subdomain) | |
1631 | { | |
1632 | int ret; | |
1633 | ||
1634 | mutex_lock(&gpd_list_lock); | |
1635 | ret = genpd_add_subdomain(genpd, subdomain); | |
1636 | mutex_unlock(&gpd_list_lock); | |
1637 | ||
1638 | return ret; | |
1639 | } | |
d60ee966 | 1640 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1641 | |
1642 | /** | |
1643 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1644 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1645 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1646 | */ |
1647 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1648 | struct generic_pm_domain *subdomain) |
f721889f | 1649 | { |
c6e83cac | 1650 | struct gpd_link *l, *link; |
f721889f RW |
1651 | int ret = -EINVAL; |
1652 | ||
5063ce15 | 1653 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1654 | return -EINVAL; |
1655 | ||
35241d12 LI |
1656 | genpd_lock(subdomain); |
1657 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1658 | |
beda5fc1 | 1659 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1660 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1661 | subdomain->name); | |
1662 | ret = -EBUSY; | |
1663 | goto out; | |
1664 | } | |
1665 | ||
c6e83cac | 1666 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1667 | if (link->slave != subdomain) |
f721889f RW |
1668 | continue; |
1669 | ||
5063ce15 RW |
1670 | list_del(&link->master_node); |
1671 | list_del(&link->slave_node); | |
1672 | kfree(link); | |
41e2c8e0 | 1673 | if (genpd_status_on(subdomain)) |
f721889f RW |
1674 | genpd_sd_counter_dec(genpd); |
1675 | ||
f721889f RW |
1676 | ret = 0; |
1677 | break; | |
1678 | } | |
1679 | ||
30e7a65b | 1680 | out: |
35241d12 LI |
1681 | genpd_unlock(genpd); |
1682 | genpd_unlock(subdomain); | |
f721889f RW |
1683 | |
1684 | return ret; | |
1685 | } | |
d60ee966 | 1686 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1687 | |
59d65b73 LI |
1688 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1689 | { | |
1690 | struct genpd_power_state *state; | |
1691 | ||
1692 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1693 | if (!state) | |
1694 | return -ENOMEM; | |
1695 | ||
1696 | genpd->states = state; | |
1697 | genpd->state_count = 1; | |
1698 | genpd->free = state; | |
1699 | ||
1700 | return 0; | |
1701 | } | |
1702 | ||
d716f479 LI |
1703 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1704 | { | |
1705 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1706 | spin_lock_init(&genpd->slock); | |
1707 | genpd->lock_ops = &genpd_spin_ops; | |
1708 | } else { | |
1709 | mutex_init(&genpd->mlock); | |
1710 | genpd->lock_ops = &genpd_mtx_ops; | |
1711 | } | |
1712 | } | |
1713 | ||
f721889f RW |
1714 | /** |
1715 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1716 | * @genpd: PM domain object to initialize. | |
1717 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1718 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1719 | * |
1720 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1721 | */ |
7eb231c3 UH |
1722 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1723 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1724 | { |
59d65b73 LI |
1725 | int ret; |
1726 | ||
f721889f | 1727 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1728 | return -EINVAL; |
f721889f | 1729 | |
5063ce15 RW |
1730 | INIT_LIST_HEAD(&genpd->master_links); |
1731 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1732 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1733 | genpd_lock_init(genpd); |
f721889f RW |
1734 | genpd->gov = gov; |
1735 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1736 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1737 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1738 | genpd->device_count = 0; |
221e9b58 | 1739 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1740 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1741 | genpd->provider = NULL; |
1742 | genpd->has_provider = false; | |
afece3ab | 1743 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1744 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1745 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1746 | genpd->domain.ops.prepare = genpd_prepare; |
1747 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1748 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1749 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1750 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1751 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1752 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1753 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1754 | |
1755 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1756 | genpd->dev_ops.stop = pm_clk_suspend; | |
1757 | genpd->dev_ops.start = pm_clk_resume; | |
1758 | } | |
1759 | ||
ffaa42e8 UH |
1760 | /* Always-on domains must be powered on at initialization. */ |
1761 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1762 | return -EINVAL; | |
1763 | ||
fc5cbf0c | 1764 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1765 | if (genpd->state_count == 0) { |
1766 | ret = genpd_set_default_power_state(genpd); | |
1767 | if (ret) | |
1768 | return ret; | |
2c9b7f87 UH |
1769 | } else if (!gov) { |
1770 | pr_warn("%s : no governor for states\n", genpd->name); | |
59d65b73 | 1771 | } |
fc5cbf0c | 1772 | |
401ea157 VK |
1773 | device_initialize(&genpd->dev); |
1774 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1775 | ||
5125bbf3 RW |
1776 | mutex_lock(&gpd_list_lock); |
1777 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1778 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1779 | |
1780 | return 0; | |
5125bbf3 | 1781 | } |
be5ed55d | 1782 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1783 | |
3fe57710 JH |
1784 | static int genpd_remove(struct generic_pm_domain *genpd) |
1785 | { | |
1786 | struct gpd_link *l, *link; | |
1787 | ||
1788 | if (IS_ERR_OR_NULL(genpd)) | |
1789 | return -EINVAL; | |
1790 | ||
35241d12 | 1791 | genpd_lock(genpd); |
3fe57710 JH |
1792 | |
1793 | if (genpd->has_provider) { | |
35241d12 | 1794 | genpd_unlock(genpd); |
3fe57710 JH |
1795 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1796 | return -EBUSY; | |
1797 | } | |
1798 | ||
1799 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1800 | genpd_unlock(genpd); |
3fe57710 JH |
1801 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1802 | return -EBUSY; | |
1803 | } | |
1804 | ||
1805 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1806 | list_del(&link->master_node); | |
1807 | list_del(&link->slave_node); | |
1808 | kfree(link); | |
1809 | } | |
1810 | ||
1811 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1812 | genpd_unlock(genpd); |
3fe57710 | 1813 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1814 | kfree(genpd->free); |
3fe57710 JH |
1815 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1816 | ||
1817 | return 0; | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1822 | * @genpd: Pointer to PM domain that is to be removed. | |
1823 | * | |
1824 | * To remove the PM domain, this function: | |
1825 | * - Removes the PM domain as a subdomain to any parent domains, | |
1826 | * if it was added. | |
1827 | * - Removes the PM domain from the list of registered PM domains. | |
1828 | * | |
1829 | * The PM domain will only be removed, if the associated provider has | |
1830 | * been removed, it is not a parent to any other PM domain and has no | |
1831 | * devices associated with it. | |
1832 | */ | |
1833 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1834 | { | |
1835 | int ret; | |
1836 | ||
1837 | mutex_lock(&gpd_list_lock); | |
1838 | ret = genpd_remove(genpd); | |
1839 | mutex_unlock(&gpd_list_lock); | |
1840 | ||
1841 | return ret; | |
1842 | } | |
1843 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1844 | ||
aa42240a | 1845 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1846 | |
aa42240a TF |
1847 | /* |
1848 | * Device Tree based PM domain providers. | |
1849 | * | |
1850 | * The code below implements generic device tree based PM domain providers that | |
1851 | * bind device tree nodes with generic PM domains registered in the system. | |
1852 | * | |
1853 | * Any driver that registers generic PM domains and needs to support binding of | |
1854 | * devices to these domains is supposed to register a PM domain provider, which | |
1855 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1856 | * | |
1857 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1858 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1859 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1860 | * index. |
1861 | */ | |
1862 | ||
1863 | /** | |
1864 | * struct of_genpd_provider - PM domain provider registration structure | |
1865 | * @link: Entry in global list of PM domain providers | |
1866 | * @node: Pointer to device tree node of PM domain provider | |
1867 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1868 | * into a PM domain. | |
1869 | * @data: context pointer to be passed into @xlate callback | |
1870 | */ | |
1871 | struct of_genpd_provider { | |
1872 | struct list_head link; | |
1873 | struct device_node *node; | |
1874 | genpd_xlate_t xlate; | |
1875 | void *data; | |
1876 | }; | |
1877 | ||
1878 | /* List of registered PM domain providers. */ | |
1879 | static LIST_HEAD(of_genpd_providers); | |
1880 | /* Mutex to protect the list above. */ | |
1881 | static DEFINE_MUTEX(of_genpd_mutex); | |
1882 | ||
1883 | /** | |
892ebdcc | 1884 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1885 | * @genpdspec: OF phandle args to map into a PM domain |
1886 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1887 | * | |
1888 | * This is a generic xlate function that can be used to model PM domains that | |
1889 | * have their own device tree nodes. The private data of xlate function needs | |
1890 | * to be a valid pointer to struct generic_pm_domain. | |
1891 | */ | |
892ebdcc | 1892 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1893 | struct of_phandle_args *genpdspec, |
1894 | void *data) | |
1895 | { | |
aa42240a TF |
1896 | return data; |
1897 | } | |
aa42240a TF |
1898 | |
1899 | /** | |
892ebdcc | 1900 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1901 | * @genpdspec: OF phandle args to map into a PM domain |
1902 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1903 | * | |
1904 | * This is a generic xlate function that can be used to model simple PM domain | |
1905 | * controllers that have one device tree node and provide multiple PM domains. | |
1906 | * A single cell is used as an index into an array of PM domains specified in | |
1907 | * the genpd_onecell_data struct when registering the provider. | |
1908 | */ | |
892ebdcc | 1909 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1910 | struct of_phandle_args *genpdspec, |
1911 | void *data) | |
1912 | { | |
1913 | struct genpd_onecell_data *genpd_data = data; | |
1914 | unsigned int idx = genpdspec->args[0]; | |
1915 | ||
1916 | if (genpdspec->args_count != 1) | |
1917 | return ERR_PTR(-EINVAL); | |
1918 | ||
1919 | if (idx >= genpd_data->num_domains) { | |
1920 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1921 | return ERR_PTR(-EINVAL); | |
1922 | } | |
1923 | ||
1924 | if (!genpd_data->domains[idx]) | |
1925 | return ERR_PTR(-ENOENT); | |
1926 | ||
1927 | return genpd_data->domains[idx]; | |
1928 | } | |
aa42240a TF |
1929 | |
1930 | /** | |
892ebdcc | 1931 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1932 | * @np: Device node pointer associated with the PM domain provider. |
1933 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1934 | * @data: Context pointer for @xlate callback. | |
1935 | */ | |
892ebdcc JH |
1936 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1937 | void *data) | |
aa42240a TF |
1938 | { |
1939 | struct of_genpd_provider *cp; | |
1940 | ||
1941 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1942 | if (!cp) | |
1943 | return -ENOMEM; | |
1944 | ||
1945 | cp->node = of_node_get(np); | |
1946 | cp->data = data; | |
1947 | cp->xlate = xlate; | |
1948 | ||
1949 | mutex_lock(&of_genpd_mutex); | |
1950 | list_add(&cp->link, &of_genpd_providers); | |
1951 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1952 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1953 | |
1954 | return 0; | |
1955 | } | |
892ebdcc JH |
1956 | |
1957 | /** | |
1958 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1959 | * @np: Device node pointer associated with the PM domain provider. | |
1960 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1961 | */ | |
1962 | int of_genpd_add_provider_simple(struct device_node *np, | |
1963 | struct generic_pm_domain *genpd) | |
1964 | { | |
0159ec67 JH |
1965 | int ret = -EINVAL; |
1966 | ||
1967 | if (!np || !genpd) | |
1968 | return -EINVAL; | |
1969 | ||
1970 | mutex_lock(&gpd_list_lock); | |
1971 | ||
6a0ae73d VK |
1972 | if (!genpd_present(genpd)) |
1973 | goto unlock; | |
1974 | ||
1975 | genpd->dev.of_node = np; | |
1976 | ||
1977 | /* Parse genpd OPP table */ | |
1978 | if (genpd->set_performance_state) { | |
1979 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
1980 | if (ret) { | |
1981 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
1982 | ret); | |
1983 | goto unlock; | |
8ce95844 | 1984 | } |
1067ae3e VK |
1985 | |
1986 | /* | |
1987 | * Save table for faster processing while setting performance | |
1988 | * state. | |
1989 | */ | |
1990 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
1991 | WARN_ON(!genpd->opp_table); | |
de0aa06d JH |
1992 | } |
1993 | ||
6a0ae73d VK |
1994 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
1995 | if (ret) { | |
1067ae3e VK |
1996 | if (genpd->set_performance_state) { |
1997 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 1998 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 1999 | } |
6a0ae73d VK |
2000 | |
2001 | goto unlock; | |
2002 | } | |
2003 | ||
2004 | genpd->provider = &np->fwnode; | |
2005 | genpd->has_provider = true; | |
2006 | ||
2007 | unlock: | |
0159ec67 JH |
2008 | mutex_unlock(&gpd_list_lock); |
2009 | ||
2010 | return ret; | |
892ebdcc JH |
2011 | } |
2012 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2013 | ||
2014 | /** | |
2015 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2016 | * @np: Device node pointer associated with the PM domain provider. | |
2017 | * @data: Pointer to the data associated with the PM domain provider. | |
2018 | */ | |
2019 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2020 | struct genpd_onecell_data *data) | |
2021 | { | |
6a0ae73d | 2022 | struct generic_pm_domain *genpd; |
0159ec67 | 2023 | unsigned int i; |
de0aa06d | 2024 | int ret = -EINVAL; |
0159ec67 JH |
2025 | |
2026 | if (!np || !data) | |
2027 | return -EINVAL; | |
2028 | ||
2029 | mutex_lock(&gpd_list_lock); | |
2030 | ||
40845524 TR |
2031 | if (!data->xlate) |
2032 | data->xlate = genpd_xlate_onecell; | |
2033 | ||
0159ec67 | 2034 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2035 | genpd = data->domains[i]; |
2036 | ||
2037 | if (!genpd) | |
609bed67 | 2038 | continue; |
6a0ae73d | 2039 | if (!genpd_present(genpd)) |
de0aa06d JH |
2040 | goto error; |
2041 | ||
6a0ae73d VK |
2042 | genpd->dev.of_node = np; |
2043 | ||
2044 | /* Parse genpd OPP table */ | |
2045 | if (genpd->set_performance_state) { | |
2046 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2047 | if (ret) { | |
2048 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2049 | i, ret); | |
2050 | goto error; | |
2051 | } | |
1067ae3e VK |
2052 | |
2053 | /* | |
2054 | * Save table for faster processing while setting | |
2055 | * performance state. | |
2056 | */ | |
2057 | genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); | |
2058 | WARN_ON(!genpd->opp_table); | |
6a0ae73d VK |
2059 | } |
2060 | ||
2061 | genpd->provider = &np->fwnode; | |
2062 | genpd->has_provider = true; | |
0159ec67 JH |
2063 | } |
2064 | ||
40845524 | 2065 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2066 | if (ret < 0) |
2067 | goto error; | |
2068 | ||
2069 | mutex_unlock(&gpd_list_lock); | |
2070 | ||
2071 | return 0; | |
2072 | ||
2073 | error: | |
2074 | while (i--) { | |
6a0ae73d VK |
2075 | genpd = data->domains[i]; |
2076 | ||
2077 | if (!genpd) | |
609bed67 | 2078 | continue; |
6a0ae73d VK |
2079 | |
2080 | genpd->provider = NULL; | |
2081 | genpd->has_provider = false; | |
2082 | ||
1067ae3e VK |
2083 | if (genpd->set_performance_state) { |
2084 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2085 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2086 | } |
de0aa06d | 2087 | } |
0159ec67 JH |
2088 | |
2089 | mutex_unlock(&gpd_list_lock); | |
2090 | ||
2091 | return ret; | |
892ebdcc JH |
2092 | } |
2093 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2094 | |
2095 | /** | |
2096 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2097 | * @np: Device node pointer associated with the PM domain provider | |
2098 | */ | |
2099 | void of_genpd_del_provider(struct device_node *np) | |
2100 | { | |
b556b15d | 2101 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2102 | struct generic_pm_domain *gpd; |
aa42240a | 2103 | |
de0aa06d | 2104 | mutex_lock(&gpd_list_lock); |
aa42240a | 2105 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2106 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2107 | if (cp->node == np) { |
de0aa06d JH |
2108 | /* |
2109 | * For each PM domain associated with the | |
2110 | * provider, set the 'has_provider' to false | |
2111 | * so that the PM domain can be safely removed. | |
2112 | */ | |
6a0ae73d VK |
2113 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2114 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2115 | gpd->has_provider = false; |
2116 | ||
6a0ae73d VK |
2117 | if (!gpd->set_performance_state) |
2118 | continue; | |
2119 | ||
1067ae3e | 2120 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2121 | dev_pm_opp_of_remove_table(&gpd->dev); |
2122 | } | |
2123 | } | |
2124 | ||
aa42240a TF |
2125 | list_del(&cp->link); |
2126 | of_node_put(cp->node); | |
2127 | kfree(cp); | |
2128 | break; | |
2129 | } | |
2130 | } | |
2131 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2132 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2133 | } |
2134 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2135 | ||
2136 | /** | |
f58d4e5a | 2137 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2138 | * @genpdspec: OF phandle args to use for look-up |
2139 | * | |
2140 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2141 | * found, uses xlate function of the provider to map phandle args to a PM | |
2142 | * domain. | |
2143 | * | |
2144 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2145 | * on failure. | |
2146 | */ | |
f58d4e5a | 2147 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2148 | struct of_phandle_args *genpdspec) |
2149 | { | |
2150 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2151 | struct of_genpd_provider *provider; | |
2152 | ||
41795a8a JH |
2153 | if (!genpdspec) |
2154 | return ERR_PTR(-EINVAL); | |
2155 | ||
aa42240a TF |
2156 | mutex_lock(&of_genpd_mutex); |
2157 | ||
2158 | /* Check if we have such a provider in our array */ | |
2159 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2160 | if (provider->node == genpdspec->np) | |
2161 | genpd = provider->xlate(genpdspec, provider->data); | |
2162 | if (!IS_ERR(genpd)) | |
2163 | break; | |
2164 | } | |
2165 | ||
2166 | mutex_unlock(&of_genpd_mutex); | |
2167 | ||
2168 | return genpd; | |
2169 | } | |
2170 | ||
ec69572b JH |
2171 | /** |
2172 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2173 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2174 | * @dev: Device to be added. | |
2175 | * | |
2176 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2177 | * the device to the PM domain. Returns a negative error code on failure. | |
2178 | */ | |
2179 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2180 | { | |
2181 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2182 | int ret; |
2183 | ||
2184 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2185 | |
f58d4e5a | 2186 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2187 | if (IS_ERR(genpd)) { |
2188 | ret = PTR_ERR(genpd); | |
2189 | goto out; | |
2190 | } | |
2191 | ||
2192 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 2193 | |
19efa5ff JH |
2194 | out: |
2195 | mutex_unlock(&gpd_list_lock); | |
2196 | ||
2197 | return ret; | |
ec69572b JH |
2198 | } |
2199 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2200 | ||
2201 | /** | |
2202 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2203 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2204 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2205 | * | |
2206 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2207 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2208 | * negative error code on failure. | |
2209 | */ | |
2210 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2211 | struct of_phandle_args *subdomain_spec) | |
2212 | { | |
2213 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2214 | int ret; |
2215 | ||
2216 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2217 | |
f58d4e5a | 2218 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2219 | if (IS_ERR(parent)) { |
2220 | ret = PTR_ERR(parent); | |
2221 | goto out; | |
2222 | } | |
ec69572b | 2223 | |
f58d4e5a | 2224 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2225 | if (IS_ERR(subdomain)) { |
2226 | ret = PTR_ERR(subdomain); | |
2227 | goto out; | |
2228 | } | |
2229 | ||
2230 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2231 | |
19efa5ff JH |
2232 | out: |
2233 | mutex_unlock(&gpd_list_lock); | |
2234 | ||
2235 | return ret; | |
ec69572b JH |
2236 | } |
2237 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2238 | ||
17926551 JH |
2239 | /** |
2240 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2241 | * @provider: Pointer to device structure associated with provider | |
2242 | * | |
2243 | * Find the last PM domain that was added by a particular provider and | |
2244 | * remove this PM domain from the list of PM domains. The provider is | |
2245 | * identified by the 'provider' device structure that is passed. The PM | |
2246 | * domain will only be removed, if the provider associated with domain | |
2247 | * has been removed. | |
2248 | * | |
2249 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2250 | * ERR_PTR() on failure. | |
2251 | */ | |
2252 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2253 | { | |
a7e2d1bc | 2254 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2255 | int ret; |
2256 | ||
2257 | if (IS_ERR_OR_NULL(np)) | |
2258 | return ERR_PTR(-EINVAL); | |
2259 | ||
2260 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2261 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2262 | if (gpd->provider == &np->fwnode) { |
2263 | ret = genpd_remove(gpd); | |
2264 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2265 | break; | |
2266 | } | |
2267 | } | |
2268 | mutex_unlock(&gpd_list_lock); | |
2269 | ||
2270 | return genpd; | |
2271 | } | |
2272 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2273 | ||
3c095f32 UH |
2274 | static void genpd_release_dev(struct device *dev) |
2275 | { | |
2276 | kfree(dev); | |
2277 | } | |
2278 | ||
2279 | static struct bus_type genpd_bus_type = { | |
2280 | .name = "genpd", | |
2281 | }; | |
2282 | ||
aa42240a TF |
2283 | /** |
2284 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2285 | * @dev: Device to detach. |
aa42240a TF |
2286 | * @power_off: Currently not used |
2287 | * | |
2288 | * Try to locate a corresponding generic PM domain, which the device was | |
2289 | * attached to previously. If such is found, the device is detached from it. | |
2290 | */ | |
2291 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2292 | { | |
446d999c | 2293 | struct generic_pm_domain *pd; |
93af5e93 | 2294 | unsigned int i; |
aa42240a TF |
2295 | int ret = 0; |
2296 | ||
85168d56 UH |
2297 | pd = dev_to_genpd(dev); |
2298 | if (IS_ERR(pd)) | |
aa42240a TF |
2299 | return; |
2300 | ||
2301 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2302 | ||
93af5e93 | 2303 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2304 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2305 | if (ret != -EAGAIN) |
2306 | break; | |
93af5e93 GU |
2307 | |
2308 | mdelay(i); | |
aa42240a TF |
2309 | cond_resched(); |
2310 | } | |
2311 | ||
2312 | if (ret < 0) { | |
2313 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2314 | pd->name, ret); | |
2315 | return; | |
2316 | } | |
2317 | ||
2318 | /* Check if PM domain can be powered off after removing this device. */ | |
2319 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2320 | |
2321 | /* Unregister the device if it was created by genpd. */ | |
2322 | if (dev->bus == &genpd_bus_type) | |
2323 | device_unregister(dev); | |
aa42240a TF |
2324 | } |
2325 | ||
632f7ce3 RK |
2326 | static void genpd_dev_pm_sync(struct device *dev) |
2327 | { | |
2328 | struct generic_pm_domain *pd; | |
2329 | ||
2330 | pd = dev_to_genpd(dev); | |
2331 | if (IS_ERR(pd)) | |
2332 | return; | |
2333 | ||
2334 | genpd_queue_power_off_work(pd); | |
2335 | } | |
2336 | ||
8cb1cbd6 | 2337 | static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np, |
895b6612 | 2338 | unsigned int index, bool power_on) |
aa42240a TF |
2339 | { |
2340 | struct of_phandle_args pd_args; | |
2341 | struct generic_pm_domain *pd; | |
2342 | int ret; | |
2343 | ||
8cb1cbd6 UH |
2344 | ret = of_parse_phandle_with_args(np, "power-domains", |
2345 | "#power-domain-cells", index, &pd_args); | |
001d50c9 | 2346 | if (ret < 0) |
bcd931f2 | 2347 | return ret; |
aa42240a | 2348 | |
19efa5ff | 2349 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2350 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2351 | of_node_put(pd_args.np); |
aa42240a | 2352 | if (IS_ERR(pd)) { |
19efa5ff | 2353 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2354 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2355 | __func__, PTR_ERR(pd)); | |
e01afc32 | 2356 | return driver_deferred_probe_check_state(dev); |
aa42240a TF |
2357 | } |
2358 | ||
2359 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2360 | ||
b56d9c91 | 2361 | ret = genpd_add_device(pd, dev, NULL); |
19efa5ff | 2362 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2363 | |
2364 | if (ret < 0) { | |
34994692 GU |
2365 | if (ret != -EPROBE_DEFER) |
2366 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2367 | pd->name, ret); | |
919b7308 | 2368 | return ret; |
aa42240a TF |
2369 | } |
2370 | ||
2371 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2372 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2373 | |
895b6612 UH |
2374 | if (power_on) { |
2375 | genpd_lock(pd); | |
2376 | ret = genpd_power_on(pd, 0); | |
2377 | genpd_unlock(pd); | |
2378 | } | |
72038df3 UH |
2379 | |
2380 | if (ret) | |
2381 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2382 | |
2383 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2384 | } |
8cb1cbd6 UH |
2385 | |
2386 | /** | |
2387 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2388 | * @dev: Device to attach. | |
2389 | * | |
2390 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2391 | * attaches the device to retrieved pm_domain ops. | |
2392 | * | |
2393 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2394 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2395 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2396 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2397 | * not probed and to re-try again later. | |
2398 | */ | |
2399 | int genpd_dev_pm_attach(struct device *dev) | |
2400 | { | |
2401 | if (!dev->of_node) | |
2402 | return 0; | |
2403 | ||
2404 | /* | |
2405 | * Devices with multiple PM domains must be attached separately, as we | |
2406 | * can only attach one PM domain per device. | |
2407 | */ | |
2408 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2409 | "#power-domain-cells") != 1) | |
2410 | return 0; | |
2411 | ||
895b6612 | 2412 | return __genpd_dev_pm_attach(dev, dev->of_node, 0, true); |
8cb1cbd6 | 2413 | } |
aa42240a | 2414 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2415 | |
3c095f32 UH |
2416 | /** |
2417 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2418 | * @dev: The device used to lookup the PM domain. | |
2419 | * @index: The index of the PM domain. | |
2420 | * | |
2421 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2422 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2423 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2424 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2425 | * | |
2426 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2427 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2428 | * failures. If a power-domain exists for the device, but cannot be found or | |
2429 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2430 | * is not probed and to re-try again later. | |
2431 | */ | |
2432 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2433 | unsigned int index) | |
2434 | { | |
560928b2 | 2435 | struct device *virt_dev; |
3c095f32 UH |
2436 | int num_domains; |
2437 | int ret; | |
2438 | ||
2439 | if (!dev->of_node) | |
2440 | return NULL; | |
2441 | ||
2442 | /* Deal only with devices using multiple PM domains. */ | |
2443 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", | |
2444 | "#power-domain-cells"); | |
2445 | if (num_domains < 2 || index >= num_domains) | |
2446 | return NULL; | |
2447 | ||
2448 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2449 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2450 | if (!virt_dev) | |
3c095f32 UH |
2451 | return ERR_PTR(-ENOMEM); |
2452 | ||
560928b2 VK |
2453 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2454 | virt_dev->bus = &genpd_bus_type; | |
2455 | virt_dev->release = genpd_release_dev; | |
3c095f32 | 2456 | |
560928b2 | 2457 | ret = device_register(virt_dev); |
3c095f32 | 2458 | if (ret) { |
560928b2 | 2459 | kfree(virt_dev); |
3c095f32 UH |
2460 | return ERR_PTR(ret); |
2461 | } | |
2462 | ||
2463 | /* Try to attach the device to the PM domain at the specified index. */ | |
560928b2 | 2464 | ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false); |
3c095f32 | 2465 | if (ret < 1) { |
560928b2 | 2466 | device_unregister(virt_dev); |
3c095f32 UH |
2467 | return ret ? ERR_PTR(ret) : NULL; |
2468 | } | |
2469 | ||
560928b2 VK |
2470 | pm_runtime_enable(virt_dev); |
2471 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2472 | |
560928b2 | 2473 | return virt_dev; |
3c095f32 UH |
2474 | } |
2475 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2476 | ||
5d6be70a UH |
2477 | /** |
2478 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2479 | * @dev: The device used to lookup the PM domain. | |
2480 | * @name: The name of the PM domain. | |
2481 | * | |
2482 | * Parse device's OF node to find a PM domain specifier using the | |
2483 | * power-domain-names DT property. For further description see | |
2484 | * genpd_dev_pm_attach_by_id(). | |
2485 | */ | |
2486 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, char *name) | |
2487 | { | |
2488 | int index; | |
2489 | ||
2490 | if (!dev->of_node) | |
2491 | return NULL; | |
2492 | ||
2493 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2494 | name); | |
2495 | if (index < 0) | |
2496 | return NULL; | |
2497 | ||
2498 | return genpd_dev_pm_attach_by_id(dev, index); | |
2499 | } | |
2500 | ||
30f60428 | 2501 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2502 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2503 | { } |
2504 | }; | |
2505 | ||
2506 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2507 | struct device_node *state_node) | |
2508 | { | |
2509 | int err; | |
2510 | u32 residency; | |
2511 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2512 | |
2513 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2514 | &entry_latency); | |
2515 | if (err) { | |
ea11e94b RH |
2516 | pr_debug(" * %pOF missing entry-latency-us property\n", |
2517 | state_node); | |
30f60428 LI |
2518 | return -EINVAL; |
2519 | } | |
2520 | ||
2521 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2522 | &exit_latency); | |
2523 | if (err) { | |
ea11e94b RH |
2524 | pr_debug(" * %pOF missing exit-latency-us property\n", |
2525 | state_node); | |
30f60428 LI |
2526 | return -EINVAL; |
2527 | } | |
2528 | ||
2529 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2530 | if (!err) | |
2531 | genpd_state->residency_ns = 1000 * residency; | |
2532 | ||
2533 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2534 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2535 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2536 | |
2537 | return 0; | |
2538 | } | |
2539 | ||
a3381e3a UH |
2540 | static int genpd_iterate_idle_states(struct device_node *dn, |
2541 | struct genpd_power_state *states) | |
2542 | { | |
2543 | int ret; | |
2544 | struct of_phandle_iterator it; | |
2545 | struct device_node *np; | |
2546 | int i = 0; | |
2547 | ||
2548 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2549 | if (ret <= 0) | |
2550 | return ret; | |
2551 | ||
2552 | /* Loop over the phandles until all the requested entry is found */ | |
2553 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2554 | np = it.node; | |
2555 | if (!of_match_node(idle_state_match, np)) | |
2556 | continue; | |
2557 | if (states) { | |
2558 | ret = genpd_parse_state(&states[i], np); | |
2559 | if (ret) { | |
2560 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2561 | np, ret); | |
2562 | of_node_put(np); | |
2563 | return ret; | |
2564 | } | |
2565 | } | |
2566 | i++; | |
2567 | } | |
2568 | ||
2569 | return i; | |
2570 | } | |
2571 | ||
30f60428 LI |
2572 | /** |
2573 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2574 | * | |
2575 | * @dn: The genpd device node | |
2576 | * @states: The pointer to which the state array will be saved. | |
2577 | * @n: The count of elements in the array returned from this function. | |
2578 | * | |
2579 | * Returns the device states parsed from the OF node. The memory for the states | |
2580 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2581 | * free the memory after use. If any or zero compatible domain idle states is |
2582 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2583 | */ |
2584 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2585 | struct genpd_power_state **states, int *n) | |
2586 | { | |
2587 | struct genpd_power_state *st; | |
a3381e3a | 2588 | int ret; |
30f60428 | 2589 | |
a3381e3a | 2590 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2591 | if (ret < 0) |
2592 | return ret; | |
2593 | ||
2594 | if (!ret) { | |
2595 | *states = NULL; | |
2596 | *n = 0; | |
2597 | return 0; | |
2598 | } | |
30f60428 | 2599 | |
a3381e3a | 2600 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2601 | if (!st) |
2602 | return -ENOMEM; | |
2603 | ||
a3381e3a UH |
2604 | ret = genpd_iterate_idle_states(dn, st); |
2605 | if (ret <= 0) { | |
2606 | kfree(st); | |
2607 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2608 | } |
2609 | ||
a3381e3a UH |
2610 | *states = st; |
2611 | *n = ret; | |
30f60428 LI |
2612 | |
2613 | return 0; | |
2614 | } | |
2615 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2616 | ||
e38f89d3 VK |
2617 | /** |
2618 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2619 | * | |
2620 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2621 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2622 | * state. | |
2623 | * | |
2624 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2625 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2626 | * power domain OPP to performance state. | |
2627 | * | |
2628 | * Returns performance state on success and 0 on failure. | |
2629 | */ | |
2630 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2631 | struct dev_pm_opp *opp) | |
2632 | { | |
2633 | struct generic_pm_domain *genpd = NULL; | |
2634 | int state; | |
2635 | ||
2636 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2637 | ||
2638 | if (unlikely(!genpd->opp_to_performance_state)) | |
2639 | return 0; | |
2640 | ||
2641 | genpd_lock(genpd); | |
2642 | state = genpd->opp_to_performance_state(genpd, opp); | |
2643 | genpd_unlock(genpd); | |
2644 | ||
2645 | return state; | |
2646 | } | |
2647 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2648 | ||
3c095f32 UH |
2649 | static int __init genpd_bus_init(void) |
2650 | { | |
2651 | return bus_register(&genpd_bus_type); | |
2652 | } | |
2653 | core_initcall(genpd_bus_init); | |
2654 | ||
d30d819d | 2655 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2656 | |
2657 | ||
2658 | /*** debugfs support ***/ | |
2659 | ||
8b0510b5 | 2660 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2661 | #include <linux/pm.h> |
2662 | #include <linux/device.h> | |
2663 | #include <linux/debugfs.h> | |
2664 | #include <linux/seq_file.h> | |
2665 | #include <linux/init.h> | |
2666 | #include <linux/kobject.h> | |
9e9704ea | 2667 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2668 | |
2669 | /* | |
2670 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2671 | * from sysfs.c, so generalize it. |
2bd5306a | 2672 | */ |
2bd5306a MM |
2673 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2674 | { | |
2675 | static const char * const status_lookup[] = { | |
2676 | [RPM_ACTIVE] = "active", | |
2677 | [RPM_RESUMING] = "resuming", | |
2678 | [RPM_SUSPENDED] = "suspended", | |
2679 | [RPM_SUSPENDING] = "suspending" | |
2680 | }; | |
2681 | const char *p = ""; | |
2682 | ||
2683 | if (dev->power.runtime_error) | |
2684 | p = "error"; | |
2685 | else if (dev->power.disable_depth) | |
2686 | p = "unsupported"; | |
2687 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2688 | p = status_lookup[dev->power.runtime_status]; | |
2689 | else | |
2690 | WARN_ON(1); | |
2691 | ||
2692 | seq_puts(s, p); | |
2693 | } | |
2bd5306a | 2694 | |
9e9704ea UH |
2695 | static int genpd_summary_one(struct seq_file *s, |
2696 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2697 | { |
2698 | static const char * const status_lookup[] = { | |
2699 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2700 | [GPD_STATE_POWER_OFF] = "off" |
2701 | }; | |
2702 | struct pm_domain_data *pm_data; | |
2703 | const char *kobj_path; | |
2704 | struct gpd_link *link; | |
6954d432 | 2705 | char state[16]; |
2bd5306a MM |
2706 | int ret; |
2707 | ||
35241d12 | 2708 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2709 | if (ret) |
2710 | return -ERESTARTSYS; | |
2711 | ||
66a5ca4b | 2712 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2713 | goto exit; |
41e2c8e0 | 2714 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2715 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2716 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2717 | else |
6954d432 GU |
2718 | snprintf(state, sizeof(state), "%s", |
2719 | status_lookup[genpd->status]); | |
2720 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2721 | |
2722 | /* | |
2723 | * Modifications on the list require holding locks on both | |
2724 | * master and slave, so we are safe. | |
66a5ca4b | 2725 | * Also genpd->name is immutable. |
2bd5306a | 2726 | */ |
66a5ca4b | 2727 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2728 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2729 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2730 | seq_puts(s, ", "); |
2731 | } | |
2732 | ||
66a5ca4b | 2733 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2734 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2735 | genpd_is_irq_safe(genpd) ? | |
2736 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2737 | if (kobj_path == NULL) |
2738 | continue; | |
2739 | ||
2740 | seq_printf(s, "\n %-50s ", kobj_path); | |
2741 | rtpm_status_str(s, pm_data->dev); | |
2742 | kfree(kobj_path); | |
2743 | } | |
2744 | ||
2745 | seq_puts(s, "\n"); | |
2746 | exit: | |
35241d12 | 2747 | genpd_unlock(genpd); |
2bd5306a MM |
2748 | |
2749 | return 0; | |
2750 | } | |
2751 | ||
d32dcc6c | 2752 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 2753 | { |
66a5ca4b | 2754 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2755 | int ret = 0; |
2756 | ||
15dec67a GU |
2757 | seq_puts(s, "domain status slaves\n"); |
2758 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2759 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2760 | ||
2761 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2762 | if (ret) | |
2763 | return -ERESTARTSYS; | |
2764 | ||
66a5ca4b | 2765 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2766 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2767 | if (ret) |
2768 | break; | |
2769 | } | |
2770 | mutex_unlock(&gpd_list_lock); | |
2771 | ||
2772 | return ret; | |
2773 | } | |
2774 | ||
d32dcc6c | 2775 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 2776 | { |
b6a1d093 TG |
2777 | static const char * const status_lookup[] = { |
2778 | [GPD_STATE_ACTIVE] = "on", | |
2779 | [GPD_STATE_POWER_OFF] = "off" | |
2780 | }; | |
2781 | ||
2782 | struct generic_pm_domain *genpd = s->private; | |
2783 | int ret = 0; | |
2784 | ||
2785 | ret = genpd_lock_interruptible(genpd); | |
2786 | if (ret) | |
2787 | return -ERESTARTSYS; | |
2788 | ||
2789 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2790 | goto exit; | |
2791 | ||
2792 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2793 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2794 | genpd->state_idx); | |
2795 | else | |
2796 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2797 | exit: | |
2798 | genpd_unlock(genpd); | |
2799 | return ret; | |
2bd5306a MM |
2800 | } |
2801 | ||
d32dcc6c | 2802 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2803 | { |
2804 | struct generic_pm_domain *genpd = s->private; | |
2805 | struct gpd_link *link; | |
2806 | int ret = 0; | |
2807 | ||
2808 | ret = genpd_lock_interruptible(genpd); | |
2809 | if (ret) | |
2810 | return -ERESTARTSYS; | |
2811 | ||
2812 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2813 | seq_printf(s, "%s\n", link->slave->name); | |
2814 | ||
2815 | genpd_unlock(genpd); | |
2816 | return ret; | |
2817 | } | |
2818 | ||
d32dcc6c | 2819 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2820 | { |
2821 | struct generic_pm_domain *genpd = s->private; | |
2822 | unsigned int i; | |
2823 | int ret = 0; | |
2824 | ||
2825 | ret = genpd_lock_interruptible(genpd); | |
2826 | if (ret) | |
2827 | return -ERESTARTSYS; | |
2828 | ||
2829 | seq_puts(s, "State Time Spent(ms)\n"); | |
2830 | ||
2831 | for (i = 0; i < genpd->state_count; i++) { | |
2832 | ktime_t delta = 0; | |
2833 | s64 msecs; | |
2834 | ||
2835 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2836 | (genpd->state_idx == i)) | |
2837 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2838 | ||
2839 | msecs = ktime_to_ms( | |
2840 | ktime_add(genpd->states[i].idle_time, delta)); | |
2841 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2842 | } | |
2843 | ||
2844 | genpd_unlock(genpd); | |
2845 | return ret; | |
2846 | } | |
2847 | ||
d32dcc6c | 2848 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2849 | { |
2850 | struct generic_pm_domain *genpd = s->private; | |
2851 | ktime_t delta = 0; | |
2852 | int ret = 0; | |
2853 | ||
2854 | ret = genpd_lock_interruptible(genpd); | |
2855 | if (ret) | |
2856 | return -ERESTARTSYS; | |
2857 | ||
2858 | if (genpd->status == GPD_STATE_ACTIVE) | |
2859 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2860 | ||
2861 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2862 | ktime_add(genpd->on_time, delta))); | |
2863 | ||
2864 | genpd_unlock(genpd); | |
2865 | return ret; | |
2866 | } | |
2867 | ||
d32dcc6c | 2868 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2869 | { |
2870 | struct generic_pm_domain *genpd = s->private; | |
2871 | ktime_t delta = 0, total = 0; | |
2872 | unsigned int i; | |
2873 | int ret = 0; | |
2874 | ||
2875 | ret = genpd_lock_interruptible(genpd); | |
2876 | if (ret) | |
2877 | return -ERESTARTSYS; | |
2878 | ||
2879 | for (i = 0; i < genpd->state_count; i++) { | |
2880 | ||
2881 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2882 | (genpd->state_idx == i)) | |
2883 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2884 | ||
2885 | total = ktime_add(total, genpd->states[i].idle_time); | |
2886 | } | |
2887 | total = ktime_add(total, delta); | |
2888 | ||
2889 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2890 | ||
2891 | genpd_unlock(genpd); | |
2892 | return ret; | |
2893 | } | |
2894 | ||
2895 | ||
d32dcc6c | 2896 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2897 | { |
2898 | struct generic_pm_domain *genpd = s->private; | |
2899 | struct pm_domain_data *pm_data; | |
2900 | const char *kobj_path; | |
2901 | int ret = 0; | |
2902 | ||
2903 | ret = genpd_lock_interruptible(genpd); | |
2904 | if (ret) | |
2905 | return -ERESTARTSYS; | |
2906 | ||
2907 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2908 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2909 | genpd_is_irq_safe(genpd) ? | |
2910 | GFP_ATOMIC : GFP_KERNEL); | |
2911 | if (kobj_path == NULL) | |
2912 | continue; | |
2913 | ||
2914 | seq_printf(s, "%s\n", kobj_path); | |
2915 | kfree(kobj_path); | |
2916 | } | |
2917 | ||
2918 | genpd_unlock(genpd); | |
2919 | return ret; | |
2920 | } | |
2921 | ||
d32dcc6c | 2922 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
2923 | { |
2924 | struct generic_pm_domain *genpd = s->private; | |
2925 | ||
2926 | if (genpd_lock_interruptible(genpd)) | |
2927 | return -ERESTARTSYS; | |
2928 | ||
2929 | seq_printf(s, "%u\n", genpd->performance_state); | |
2930 | ||
2931 | genpd_unlock(genpd); | |
2932 | return 0; | |
2933 | } | |
2934 | ||
d32dcc6c YL |
2935 | DEFINE_SHOW_ATTRIBUTE(summary); |
2936 | DEFINE_SHOW_ATTRIBUTE(status); | |
2937 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
2938 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
2939 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
2940 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
2941 | DEFINE_SHOW_ATTRIBUTE(devices); | |
2942 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 2943 | |
9e9704ea | 2944 | static int __init genpd_debug_init(void) |
2bd5306a MM |
2945 | { |
2946 | struct dentry *d; | |
b6a1d093 | 2947 | struct generic_pm_domain *genpd; |
2bd5306a | 2948 | |
9e9704ea | 2949 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 2950 | |
9e9704ea | 2951 | if (!genpd_debugfs_dir) |
2bd5306a MM |
2952 | return -ENOMEM; |
2953 | ||
2954 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
d32dcc6c | 2955 | genpd_debugfs_dir, NULL, &summary_fops); |
2bd5306a MM |
2956 | if (!d) |
2957 | return -ENOMEM; | |
2958 | ||
b6a1d093 | 2959 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2960 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
2961 | if (!d) |
2962 | return -ENOMEM; | |
2963 | ||
2964 | debugfs_create_file("current_state", 0444, | |
d32dcc6c | 2965 | d, genpd, &status_fops); |
b6a1d093 | 2966 | debugfs_create_file("sub_domains", 0444, |
d32dcc6c | 2967 | d, genpd, &sub_domains_fops); |
b6a1d093 | 2968 | debugfs_create_file("idle_states", 0444, |
d32dcc6c | 2969 | d, genpd, &idle_states_fops); |
b6a1d093 | 2970 | debugfs_create_file("active_time", 0444, |
d32dcc6c | 2971 | d, genpd, &active_time_fops); |
b6a1d093 | 2972 | debugfs_create_file("total_idle_time", 0444, |
d32dcc6c | 2973 | d, genpd, &total_idle_time_fops); |
b6a1d093 | 2974 | debugfs_create_file("devices", 0444, |
d32dcc6c | 2975 | d, genpd, &devices_fops); |
e8912812 RN |
2976 | if (genpd->set_performance_state) |
2977 | debugfs_create_file("perf_state", 0444, | |
d32dcc6c | 2978 | d, genpd, &perf_state_fops); |
b6a1d093 TG |
2979 | } |
2980 | ||
2bd5306a MM |
2981 | return 0; |
2982 | } | |
9e9704ea | 2983 | late_initcall(genpd_debug_init); |
2bd5306a | 2984 | |
9e9704ea | 2985 | static void __exit genpd_debug_exit(void) |
2bd5306a | 2986 | { |
9e9704ea | 2987 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 2988 | } |
9e9704ea | 2989 | __exitcall(genpd_debug_exit); |
8b0510b5 | 2990 | #endif /* CONFIG_DEBUG_FS */ |