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> |
f721889f RW |
13 | #include <linux/pm_runtime.h> |
14 | #include <linux/pm_domain.h> | |
6ff7bb0d | 15 | #include <linux/pm_qos.h> |
c11f6f5b | 16 | #include <linux/pm_clock.h> |
f721889f RW |
17 | #include <linux/slab.h> |
18 | #include <linux/err.h> | |
17b75eca RW |
19 | #include <linux/sched.h> |
20 | #include <linux/suspend.h> | |
d5e4cbfe RW |
21 | #include <linux/export.h> |
22 | ||
aa8e54b5 TV |
23 | #include "power.h" |
24 | ||
93af5e93 GU |
25 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
26 | ||
d5e4cbfe RW |
27 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
28 | ({ \ | |
29 | type (*__routine)(struct device *__d); \ | |
30 | type __ret = (type)0; \ | |
31 | \ | |
32 | __routine = genpd->dev_ops.callback; \ | |
33 | if (__routine) { \ | |
34 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
35 | } \ |
36 | __ret; \ | |
37 | }) | |
f721889f | 38 | |
5125bbf3 RW |
39 | static LIST_HEAD(gpd_list); |
40 | static DEFINE_MUTEX(gpd_list_lock); | |
41 | ||
35241d12 LI |
42 | struct genpd_lock_ops { |
43 | void (*lock)(struct generic_pm_domain *genpd); | |
44 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
45 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
46 | void (*unlock)(struct generic_pm_domain *genpd); | |
47 | }; | |
48 | ||
49 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
50 | { | |
51 | mutex_lock(&genpd->mlock); | |
52 | } | |
53 | ||
54 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
55 | int depth) | |
56 | { | |
57 | mutex_lock_nested(&genpd->mlock, depth); | |
58 | } | |
59 | ||
60 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
61 | { | |
62 | return mutex_lock_interruptible(&genpd->mlock); | |
63 | } | |
64 | ||
65 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
66 | { | |
67 | return mutex_unlock(&genpd->mlock); | |
68 | } | |
69 | ||
70 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
71 | .lock = genpd_lock_mtx, | |
72 | .lock_nested = genpd_lock_nested_mtx, | |
73 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
74 | .unlock = genpd_unlock_mtx, | |
75 | }; | |
76 | ||
d716f479 LI |
77 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
78 | __acquires(&genpd->slock) | |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | spin_lock_irqsave(&genpd->slock, flags); | |
83 | genpd->lock_flags = flags; | |
84 | } | |
85 | ||
86 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
87 | int depth) | |
88 | __acquires(&genpd->slock) | |
89 | { | |
90 | unsigned long flags; | |
91 | ||
92 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
93 | genpd->lock_flags = flags; | |
94 | } | |
95 | ||
96 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
97 | __acquires(&genpd->slock) | |
98 | { | |
99 | unsigned long flags; | |
100 | ||
101 | spin_lock_irqsave(&genpd->slock, flags); | |
102 | genpd->lock_flags = flags; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
107 | __releases(&genpd->slock) | |
108 | { | |
109 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
110 | } | |
111 | ||
112 | static const struct genpd_lock_ops genpd_spin_ops = { | |
113 | .lock = genpd_lock_spin, | |
114 | .lock_nested = genpd_lock_nested_spin, | |
115 | .lock_interruptible = genpd_lock_interruptible_spin, | |
116 | .unlock = genpd_unlock_spin, | |
117 | }; | |
118 | ||
35241d12 LI |
119 | #define genpd_lock(p) p->lock_ops->lock(p) |
120 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
121 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
122 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
123 | ||
41e2c8e0 | 124 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 125 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 126 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
d716f479 LI |
127 | |
128 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
129 | struct generic_pm_domain *genpd) | |
130 | { | |
131 | bool ret; | |
132 | ||
133 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
134 | ||
f3c826ac | 135 | /* Warn once if IRQ safe dev in no sleep domain */ |
d716f479 LI |
136 | if (ret) |
137 | dev_warn_once(dev, "PM domain %s will not be powered off\n", | |
138 | genpd->name); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
446d999c RK |
143 | /* |
144 | * Get the generic PM domain for a particular struct device. | |
145 | * This validates the struct device pointer, the PM domain pointer, | |
146 | * and checks that the PM domain pointer is a real generic PM domain. | |
147 | * Any failure results in NULL being returned. | |
148 | */ | |
f58d4e5a | 149 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
150 | { |
151 | struct generic_pm_domain *genpd = NULL, *gpd; | |
152 | ||
153 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
154 | return NULL; | |
155 | ||
156 | mutex_lock(&gpd_list_lock); | |
157 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
158 | if (&gpd->domain == dev->pm_domain) { | |
159 | genpd = gpd; | |
160 | break; | |
161 | } | |
162 | } | |
163 | mutex_unlock(&gpd_list_lock); | |
164 | ||
165 | return genpd; | |
166 | } | |
167 | ||
168 | /* | |
169 | * This should only be used where we are certain that the pm_domain | |
170 | * attached to the device is a genpd domain. | |
171 | */ | |
172 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
173 | { |
174 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
175 | return ERR_PTR(-EINVAL); | |
176 | ||
596ba34b | 177 | return pd_to_genpd(dev->pm_domain); |
5248051b | 178 | } |
f721889f | 179 | |
2b1d88cd | 180 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 181 | { |
2b1d88cd | 182 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
183 | } |
184 | ||
2b1d88cd | 185 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 186 | { |
2b1d88cd | 187 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
188 | } |
189 | ||
c4bb3160 | 190 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 191 | { |
c4bb3160 RW |
192 | bool ret = false; |
193 | ||
194 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
195 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
196 | ||
197 | return ret; | |
198 | } | |
199 | ||
200 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
201 | { | |
202 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 203 | smp_mb__after_atomic(); |
f721889f RW |
204 | } |
205 | ||
86e12eac | 206 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 207 | { |
fc5cbf0c | 208 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
209 | ktime_t time_start; |
210 | s64 elapsed_ns; | |
211 | int ret; | |
212 | ||
213 | if (!genpd->power_on) | |
214 | return 0; | |
215 | ||
a4630c61 GU |
216 | if (!timed) |
217 | return genpd->power_on(genpd); | |
218 | ||
c8f0ea45 GU |
219 | time_start = ktime_get(); |
220 | ret = genpd->power_on(genpd); | |
221 | if (ret) | |
222 | return ret; | |
223 | ||
224 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 225 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
226 | return ret; |
227 | ||
fc5cbf0c | 228 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 229 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
230 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
231 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
232 | |
233 | return ret; | |
234 | } | |
235 | ||
86e12eac | 236 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 237 | { |
fc5cbf0c | 238 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
239 | ktime_t time_start; |
240 | s64 elapsed_ns; | |
241 | int ret; | |
242 | ||
243 | if (!genpd->power_off) | |
244 | return 0; | |
245 | ||
a4630c61 GU |
246 | if (!timed) |
247 | return genpd->power_off(genpd); | |
248 | ||
c8f0ea45 GU |
249 | time_start = ktime_get(); |
250 | ret = genpd->power_off(genpd); | |
251 | if (ret == -EBUSY) | |
252 | return ret; | |
253 | ||
254 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 255 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
256 | return ret; |
257 | ||
fc5cbf0c | 258 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 259 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
260 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
261 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
262 | |
263 | return ret; | |
264 | } | |
265 | ||
29e47e21 | 266 | /** |
86e12eac | 267 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 268 | * @genpd: PM domain to power off. |
29e47e21 | 269 | * |
86e12eac | 270 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
271 | * before. |
272 | */ | |
273 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
274 | { | |
275 | queue_work(pm_wq, &genpd->power_off_work); | |
276 | } | |
277 | ||
1f8728b7 UH |
278 | /** |
279 | * genpd_power_off - Remove power from a given PM domain. | |
280 | * @genpd: PM domain to power down. | |
3c64649d UH |
281 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
282 | * RPM status of the releated device is in an intermediate state, not yet turned | |
283 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
284 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
285 | * |
286 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
287 | * have been powered down, remove power from @genpd. | |
288 | */ | |
2da83545 UH |
289 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
290 | unsigned int depth) | |
1f8728b7 UH |
291 | { |
292 | struct pm_domain_data *pdd; | |
293 | struct gpd_link *link; | |
294 | unsigned int not_suspended = 0; | |
295 | ||
296 | /* | |
297 | * Do not try to power off the domain in the following situations: | |
298 | * (1) The domain is already in the "power off" state. | |
299 | * (2) System suspend is in progress. | |
300 | */ | |
41e2c8e0 | 301 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
302 | return 0; |
303 | ||
ffaa42e8 UH |
304 | /* |
305 | * Abort power off for the PM domain in the following situations: | |
306 | * (1) The domain is configured as always on. | |
307 | * (2) When the domain has a subdomain being powered on. | |
308 | */ | |
309 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
310 | return -EBUSY; |
311 | ||
312 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
313 | enum pm_qos_flags_status stat; | |
314 | ||
315 | stat = dev_pm_qos_flags(pdd->dev, | |
316 | PM_QOS_FLAG_NO_POWER_OFF | |
317 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
318 | if (stat > PM_QOS_FLAGS_NONE) | |
319 | return -EBUSY; | |
320 | ||
321 | /* | |
322 | * Do not allow PM domain to be powered off, when an IRQ safe | |
323 | * device is part of a non-IRQ safe domain. | |
324 | */ | |
325 | if (!pm_runtime_suspended(pdd->dev) || | |
326 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
327 | not_suspended++; | |
328 | } | |
329 | ||
3c64649d | 330 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
331 | return -EBUSY; |
332 | ||
333 | if (genpd->gov && genpd->gov->power_down_ok) { | |
334 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
335 | return -EAGAIN; | |
336 | } | |
337 | ||
338 | if (genpd->power_off) { | |
339 | int ret; | |
340 | ||
341 | if (atomic_read(&genpd->sd_count) > 0) | |
342 | return -EBUSY; | |
343 | ||
344 | /* | |
345 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
346 | * managed to call genpd_power_on() for the master yet after | |
347 | * incrementing it. In that case genpd_power_on() will wait | |
348 | * for us to drop the lock, so we can call .power_off() and let | |
349 | * the genpd_power_on() restore power for us (this shouldn't | |
350 | * happen very often). | |
351 | */ | |
352 | ret = _genpd_power_off(genpd, true); | |
353 | if (ret) | |
354 | return ret; | |
355 | } | |
356 | ||
357 | genpd->status = GPD_STATE_POWER_OFF; | |
358 | ||
359 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
360 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
361 | genpd_lock_nested(link->master, depth + 1); |
362 | genpd_power_off(link->master, false, depth + 1); | |
363 | genpd_unlock(link->master); | |
1f8728b7 UH |
364 | } |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
5248051b | 369 | /** |
86e12eac | 370 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 371 | * @genpd: PM domain to power up. |
0106ef51 | 372 | * @depth: nesting count for lockdep. |
5248051b | 373 | * |
5063ce15 | 374 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
375 | * resume a device belonging to it. |
376 | */ | |
86e12eac | 377 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 378 | { |
5063ce15 | 379 | struct gpd_link *link; |
5248051b RW |
380 | int ret = 0; |
381 | ||
41e2c8e0 | 382 | if (genpd_status_on(genpd)) |
3f241775 | 383 | return 0; |
5248051b | 384 | |
5063ce15 RW |
385 | /* |
386 | * The list is guaranteed not to change while the loop below is being | |
387 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
388 | * with it. | |
389 | */ | |
390 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
391 | struct generic_pm_domain *master = link->master; |
392 | ||
393 | genpd_sd_counter_inc(master); | |
394 | ||
35241d12 | 395 | genpd_lock_nested(master, depth + 1); |
86e12eac | 396 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 397 | genpd_unlock(master); |
5248051b | 398 | |
5063ce15 | 399 | if (ret) { |
0106ef51 | 400 | genpd_sd_counter_dec(master); |
9e08cf42 | 401 | goto err; |
5063ce15 | 402 | } |
5248051b RW |
403 | } |
404 | ||
86e12eac | 405 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
406 | if (ret) |
407 | goto err; | |
5248051b | 408 | |
ba2bbfbf | 409 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 410 | return 0; |
9e08cf42 RW |
411 | |
412 | err: | |
29e47e21 UH |
413 | list_for_each_entry_continue_reverse(link, |
414 | &genpd->slave_links, | |
415 | slave_node) { | |
5063ce15 | 416 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
417 | genpd_lock_nested(link->master, depth + 1); |
418 | genpd_power_off(link->master, false, depth + 1); | |
419 | genpd_unlock(link->master); | |
29e47e21 | 420 | } |
9e08cf42 | 421 | |
3f241775 RW |
422 | return ret; |
423 | } | |
424 | ||
6ff7bb0d RW |
425 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
426 | unsigned long val, void *ptr) | |
427 | { | |
428 | struct generic_pm_domain_data *gpd_data; | |
429 | struct device *dev; | |
430 | ||
431 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 432 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
433 | |
434 | for (;;) { | |
435 | struct generic_pm_domain *genpd; | |
436 | struct pm_domain_data *pdd; | |
437 | ||
438 | spin_lock_irq(&dev->power.lock); | |
439 | ||
440 | pdd = dev->power.subsys_data ? | |
441 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 442 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
443 | to_gpd_data(pdd)->td.constraint_changed = true; |
444 | genpd = dev_to_genpd(dev); | |
445 | } else { | |
446 | genpd = ERR_PTR(-ENODATA); | |
447 | } | |
448 | ||
449 | spin_unlock_irq(&dev->power.lock); | |
450 | ||
451 | if (!IS_ERR(genpd)) { | |
35241d12 | 452 | genpd_lock(genpd); |
6ff7bb0d | 453 | genpd->max_off_time_changed = true; |
35241d12 | 454 | genpd_unlock(genpd); |
6ff7bb0d RW |
455 | } |
456 | ||
457 | dev = dev->parent; | |
458 | if (!dev || dev->power.ignore_children) | |
459 | break; | |
460 | } | |
461 | ||
462 | return NOTIFY_DONE; | |
463 | } | |
464 | ||
f721889f RW |
465 | /** |
466 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
467 | * @work: Work structure used for scheduling the execution of this function. | |
468 | */ | |
469 | static void genpd_power_off_work_fn(struct work_struct *work) | |
470 | { | |
471 | struct generic_pm_domain *genpd; | |
472 | ||
473 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
474 | ||
35241d12 | 475 | genpd_lock(genpd); |
2da83545 | 476 | genpd_power_off(genpd, false, 0); |
35241d12 | 477 | genpd_unlock(genpd); |
f721889f RW |
478 | } |
479 | ||
54eeddbf UH |
480 | /** |
481 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
482 | * @dev: Device to handle. | |
483 | */ | |
484 | static int __genpd_runtime_suspend(struct device *dev) | |
485 | { | |
486 | int (*cb)(struct device *__dev); | |
487 | ||
488 | if (dev->type && dev->type->pm) | |
489 | cb = dev->type->pm->runtime_suspend; | |
490 | else if (dev->class && dev->class->pm) | |
491 | cb = dev->class->pm->runtime_suspend; | |
492 | else if (dev->bus && dev->bus->pm) | |
493 | cb = dev->bus->pm->runtime_suspend; | |
494 | else | |
495 | cb = NULL; | |
496 | ||
497 | if (!cb && dev->driver && dev->driver->pm) | |
498 | cb = dev->driver->pm->runtime_suspend; | |
499 | ||
500 | return cb ? cb(dev) : 0; | |
501 | } | |
502 | ||
503 | /** | |
504 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
505 | * @dev: Device to handle. | |
506 | */ | |
507 | static int __genpd_runtime_resume(struct device *dev) | |
508 | { | |
509 | int (*cb)(struct device *__dev); | |
510 | ||
511 | if (dev->type && dev->type->pm) | |
512 | cb = dev->type->pm->runtime_resume; | |
513 | else if (dev->class && dev->class->pm) | |
514 | cb = dev->class->pm->runtime_resume; | |
515 | else if (dev->bus && dev->bus->pm) | |
516 | cb = dev->bus->pm->runtime_resume; | |
517 | else | |
518 | cb = NULL; | |
519 | ||
520 | if (!cb && dev->driver && dev->driver->pm) | |
521 | cb = dev->driver->pm->runtime_resume; | |
522 | ||
523 | return cb ? cb(dev) : 0; | |
524 | } | |
525 | ||
f721889f | 526 | /** |
795bd2e7 | 527 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
528 | * @dev: Device to suspend. |
529 | * | |
530 | * Carry out a runtime suspend of a device under the assumption that its | |
531 | * pm_domain field points to the domain member of an object of type | |
532 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
533 | */ | |
795bd2e7 | 534 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
535 | { |
536 | struct generic_pm_domain *genpd; | |
9df3921e | 537 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 538 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 539 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
540 | ktime_t time_start; |
541 | s64 elapsed_ns; | |
d5e4cbfe | 542 | int ret; |
f721889f RW |
543 | |
544 | dev_dbg(dev, "%s()\n", __func__); | |
545 | ||
5248051b RW |
546 | genpd = dev_to_genpd(dev); |
547 | if (IS_ERR(genpd)) | |
f721889f RW |
548 | return -EINVAL; |
549 | ||
ffe12855 UH |
550 | /* |
551 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
552 | * callbacks for other purposes than runtime PM. In those scenarios | |
553 | * runtime PM is disabled. Under these circumstances, we shall skip | |
554 | * validating/measuring the PM QoS latency. | |
555 | */ | |
9df3921e UH |
556 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
557 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
558 | return -EBUSY; |
559 | ||
2b1d88cd | 560 | /* Measure suspend latency. */ |
d33d5a6c | 561 | time_start = 0; |
ffe12855 UH |
562 | if (runtime_pm) |
563 | time_start = ktime_get(); | |
2b1d88cd | 564 | |
54eeddbf | 565 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
566 | if (ret) |
567 | return ret; | |
17b75eca | 568 | |
2b1d88cd | 569 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 570 | if (ret) { |
54eeddbf | 571 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
572 | return ret; |
573 | } | |
574 | ||
2b1d88cd | 575 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
576 | if (runtime_pm) { |
577 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
578 | if (elapsed_ns > td->suspend_latency_ns) { | |
579 | td->suspend_latency_ns = elapsed_ns; | |
580 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
581 | elapsed_ns); | |
582 | genpd->max_off_time_changed = true; | |
583 | td->constraint_changed = true; | |
584 | } | |
2b1d88cd UH |
585 | } |
586 | ||
0aa2a221 | 587 | /* |
d716f479 LI |
588 | * If power.irq_safe is set, this routine may be run with |
589 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 590 | */ |
d716f479 | 591 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
592 | return 0; |
593 | ||
35241d12 | 594 | genpd_lock(genpd); |
2da83545 | 595 | genpd_power_off(genpd, true, 0); |
35241d12 | 596 | genpd_unlock(genpd); |
f721889f RW |
597 | |
598 | return 0; | |
599 | } | |
600 | ||
f721889f | 601 | /** |
795bd2e7 | 602 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
603 | * @dev: Device to resume. |
604 | * | |
605 | * Carry out a runtime resume of a device under the assumption that its | |
606 | * pm_domain field points to the domain member of an object of type | |
607 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
608 | */ | |
795bd2e7 | 609 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
610 | { |
611 | struct generic_pm_domain *genpd; | |
2b1d88cd | 612 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 613 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
614 | ktime_t time_start; |
615 | s64 elapsed_ns; | |
f721889f | 616 | int ret; |
ba2bbfbf | 617 | bool timed = true; |
f721889f RW |
618 | |
619 | dev_dbg(dev, "%s()\n", __func__); | |
620 | ||
5248051b RW |
621 | genpd = dev_to_genpd(dev); |
622 | if (IS_ERR(genpd)) | |
f721889f RW |
623 | return -EINVAL; |
624 | ||
d716f479 LI |
625 | /* |
626 | * As we don't power off a non IRQ safe domain, which holds | |
627 | * an IRQ safe device, we don't need to restore power to it. | |
628 | */ | |
629 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
630 | timed = false; |
631 | goto out; | |
632 | } | |
0aa2a221 | 633 | |
35241d12 | 634 | genpd_lock(genpd); |
86e12eac | 635 | ret = genpd_power_on(genpd, 0); |
35241d12 | 636 | genpd_unlock(genpd); |
c6d22b37 | 637 | |
ba2bbfbf UH |
638 | if (ret) |
639 | return ret; | |
c6d22b37 | 640 | |
ba2bbfbf | 641 | out: |
2b1d88cd | 642 | /* Measure resume latency. */ |
ab51e6ba | 643 | time_start = 0; |
ffe12855 | 644 | if (timed && runtime_pm) |
2b1d88cd UH |
645 | time_start = ktime_get(); |
646 | ||
076395ca LP |
647 | ret = genpd_start_dev(genpd, dev); |
648 | if (ret) | |
649 | goto err_poweroff; | |
650 | ||
54eeddbf | 651 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
652 | if (ret) |
653 | goto err_stop; | |
2b1d88cd UH |
654 | |
655 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 656 | if (timed && runtime_pm) { |
2b1d88cd UH |
657 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
658 | if (elapsed_ns > td->resume_latency_ns) { | |
659 | td->resume_latency_ns = elapsed_ns; | |
660 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
661 | elapsed_ns); | |
662 | genpd->max_off_time_changed = true; | |
663 | td->constraint_changed = true; | |
664 | } | |
665 | } | |
17b75eca | 666 | |
f721889f | 667 | return 0; |
076395ca LP |
668 | |
669 | err_stop: | |
670 | genpd_stop_dev(genpd, dev); | |
671 | err_poweroff: | |
d716f479 LI |
672 | if (!pm_runtime_is_irq_safe(dev) || |
673 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 674 | genpd_lock(genpd); |
2da83545 | 675 | genpd_power_off(genpd, true, 0); |
35241d12 | 676 | genpd_unlock(genpd); |
076395ca LP |
677 | } |
678 | ||
679 | return ret; | |
f721889f RW |
680 | } |
681 | ||
39ac5ba5 TB |
682 | static bool pd_ignore_unused; |
683 | static int __init pd_ignore_unused_setup(char *__unused) | |
684 | { | |
685 | pd_ignore_unused = true; | |
686 | return 1; | |
687 | } | |
688 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
689 | ||
17f2ae7f | 690 | /** |
86e12eac | 691 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 692 | */ |
86e12eac | 693 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
694 | { |
695 | struct generic_pm_domain *genpd; | |
696 | ||
39ac5ba5 TB |
697 | if (pd_ignore_unused) { |
698 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 699 | return 0; |
39ac5ba5 TB |
700 | } |
701 | ||
17f2ae7f RW |
702 | mutex_lock(&gpd_list_lock); |
703 | ||
704 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
705 | genpd_queue_power_off_work(genpd); | |
706 | ||
707 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 708 | |
2fe71dcd UH |
709 | return 0; |
710 | } | |
86e12eac | 711 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 712 | |
0159ec67 | 713 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 714 | |
77f827de RW |
715 | /** |
716 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
717 | * @genpd: PM domain to check. | |
718 | */ | |
895b31f3 | 719 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 720 | { |
895b31f3 | 721 | const struct generic_pm_domain *gpd; |
77f827de RW |
722 | |
723 | if (IS_ERR_OR_NULL(genpd)) | |
724 | return false; | |
725 | ||
726 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
727 | if (gpd == genpd) | |
728 | return true; | |
729 | ||
730 | return false; | |
731 | } | |
732 | ||
0159ec67 JH |
733 | #endif |
734 | ||
735 | #ifdef CONFIG_PM_SLEEP | |
736 | ||
d5e4cbfe RW |
737 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
738 | struct device *dev) | |
739 | { | |
740 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
741 | } | |
742 | ||
596ba34b | 743 | /** |
86e12eac | 744 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 745 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
746 | * @use_lock: use the lock. |
747 | * @depth: nesting count for lockdep. | |
596ba34b RW |
748 | * |
749 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 750 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 751 | * |
77f827de | 752 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
753 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
754 | * these cases the lock must be held. | |
596ba34b | 755 | */ |
0883ac03 UH |
756 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
757 | unsigned int depth) | |
596ba34b | 758 | { |
5063ce15 | 759 | struct gpd_link *link; |
596ba34b | 760 | |
ffaa42e8 | 761 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
762 | return; |
763 | ||
c4bb3160 RW |
764 | if (genpd->suspended_count != genpd->device_count |
765 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
766 | return; |
767 | ||
fc5cbf0c AH |
768 | /* Choose the deepest state when suspending */ |
769 | genpd->state_idx = genpd->state_count - 1; | |
86e12eac | 770 | _genpd_power_off(genpd, false); |
596ba34b | 771 | |
17b75eca | 772 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
773 | |
774 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
775 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
776 | |
777 | if (use_lock) | |
778 | genpd_lock_nested(link->master, depth + 1); | |
779 | ||
780 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
781 | ||
782 | if (use_lock) | |
783 | genpd_unlock(link->master); | |
596ba34b RW |
784 | } |
785 | } | |
786 | ||
802d8b49 | 787 | /** |
86e12eac | 788 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 789 | * @genpd: PM domain to power on. |
0883ac03 UH |
790 | * @use_lock: use the lock. |
791 | * @depth: nesting count for lockdep. | |
802d8b49 | 792 | * |
77f827de | 793 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
794 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
795 | * these cases the lock must be held. | |
802d8b49 | 796 | */ |
0883ac03 UH |
797 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
798 | unsigned int depth) | |
802d8b49 RW |
799 | { |
800 | struct gpd_link *link; | |
801 | ||
41e2c8e0 | 802 | if (genpd_status_on(genpd)) |
802d8b49 RW |
803 | return; |
804 | ||
805 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 806 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
807 | |
808 | if (use_lock) | |
809 | genpd_lock_nested(link->master, depth + 1); | |
810 | ||
811 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
812 | ||
813 | if (use_lock) | |
814 | genpd_unlock(link->master); | |
802d8b49 RW |
815 | } |
816 | ||
86e12eac | 817 | _genpd_power_on(genpd, false); |
802d8b49 RW |
818 | |
819 | genpd->status = GPD_STATE_ACTIVE; | |
820 | } | |
821 | ||
4ecd6e65 RW |
822 | /** |
823 | * resume_needed - Check whether to resume a device before system suspend. | |
824 | * @dev: Device to check. | |
825 | * @genpd: PM domain the device belongs to. | |
826 | * | |
827 | * There are two cases in which a device that can wake up the system from sleep | |
828 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
829 | * to wake up the system and it has to remain active for this purpose while the | |
830 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
831 | * the system from sleep states and it generally doesn't generate wakeup signals | |
832 | * by itself (those signals are generated on its behalf by other parts of the | |
833 | * system). In the latter case it may be necessary to reconfigure the device's | |
834 | * wakeup settings during system suspend, because it may have been set up to | |
835 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
836 | * Return 'true' in either of the above cases. | |
837 | */ | |
838 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
839 | { | |
840 | bool active_wakeup; | |
841 | ||
842 | if (!device_can_wakeup(dev)) | |
843 | return false; | |
844 | ||
d5e4cbfe | 845 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
846 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
847 | } | |
848 | ||
596ba34b RW |
849 | /** |
850 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
851 | * @dev: Device to start the transition of. | |
852 | * | |
853 | * Start a power transition of a device (during a system-wide power transition) | |
854 | * under the assumption that its pm_domain field points to the domain member of | |
855 | * an object of type struct generic_pm_domain representing a PM domain | |
856 | * consisting of I/O devices. | |
857 | */ | |
858 | static int pm_genpd_prepare(struct device *dev) | |
859 | { | |
860 | struct generic_pm_domain *genpd; | |
b6c10c84 | 861 | int ret; |
596ba34b RW |
862 | |
863 | dev_dbg(dev, "%s()\n", __func__); | |
864 | ||
865 | genpd = dev_to_genpd(dev); | |
866 | if (IS_ERR(genpd)) | |
867 | return -EINVAL; | |
868 | ||
17b75eca RW |
869 | /* |
870 | * If a wakeup request is pending for the device, it should be woken up | |
871 | * at this point and a system wakeup event should be reported if it's | |
872 | * set up to wake up the system from sleep states. | |
873 | */ | |
4ecd6e65 RW |
874 | if (resume_needed(dev, genpd)) |
875 | pm_runtime_resume(dev); | |
876 | ||
35241d12 | 877 | genpd_lock(genpd); |
596ba34b | 878 | |
39dd0f23 | 879 | if (genpd->prepared_count++ == 0) |
65533bbf | 880 | genpd->suspended_count = 0; |
17b75eca | 881 | |
35241d12 | 882 | genpd_unlock(genpd); |
596ba34b | 883 | |
b6c10c84 RW |
884 | ret = pm_generic_prepare(dev); |
885 | if (ret) { | |
35241d12 | 886 | genpd_lock(genpd); |
b6c10c84 | 887 | |
39dd0f23 | 888 | genpd->prepared_count--; |
b6c10c84 | 889 | |
35241d12 | 890 | genpd_unlock(genpd); |
b6c10c84 | 891 | } |
17b75eca | 892 | |
b6c10c84 | 893 | return ret; |
596ba34b RW |
894 | } |
895 | ||
0496c8ae RW |
896 | /** |
897 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
898 | * @dev: Device to suspend. | |
899 | * | |
900 | * Stop the device and remove power from the domain if all devices in it have | |
901 | * been stopped. | |
902 | */ | |
903 | static int pm_genpd_suspend_noirq(struct device *dev) | |
904 | { | |
905 | struct generic_pm_domain *genpd; | |
122a2237 | 906 | int ret; |
0496c8ae RW |
907 | |
908 | dev_dbg(dev, "%s()\n", __func__); | |
909 | ||
910 | genpd = dev_to_genpd(dev); | |
911 | if (IS_ERR(genpd)) | |
912 | return -EINVAL; | |
596ba34b | 913 | |
39dd0f23 | 914 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
915 | return 0; |
916 | ||
122a2237 UH |
917 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
918 | ret = pm_runtime_force_suspend(dev); | |
919 | if (ret) | |
920 | return ret; | |
921 | } | |
922 | ||
0883ac03 | 923 | genpd_lock(genpd); |
596ba34b | 924 | genpd->suspended_count++; |
0883ac03 UH |
925 | genpd_sync_power_off(genpd, true, 0); |
926 | genpd_unlock(genpd); | |
596ba34b RW |
927 | |
928 | return 0; | |
929 | } | |
930 | ||
931 | /** | |
0496c8ae | 932 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
933 | * @dev: Device to resume. |
934 | * | |
0496c8ae | 935 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
936 | */ |
937 | static int pm_genpd_resume_noirq(struct device *dev) | |
938 | { | |
939 | struct generic_pm_domain *genpd; | |
122a2237 | 940 | int ret = 0; |
596ba34b RW |
941 | |
942 | dev_dbg(dev, "%s()\n", __func__); | |
943 | ||
944 | genpd = dev_to_genpd(dev); | |
945 | if (IS_ERR(genpd)) | |
946 | return -EINVAL; | |
947 | ||
39dd0f23 | 948 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
949 | return 0; |
950 | ||
0883ac03 UH |
951 | genpd_lock(genpd); |
952 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 953 | genpd->suspended_count--; |
0883ac03 | 954 | genpd_unlock(genpd); |
596ba34b | 955 | |
122a2237 UH |
956 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
957 | ret = pm_runtime_force_resume(dev); | |
958 | ||
959 | return ret; | |
596ba34b RW |
960 | } |
961 | ||
0496c8ae RW |
962 | /** |
963 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
964 | * @dev: Device to freeze. |
965 | * | |
966 | * Carry out a late freeze of a device under the assumption that its | |
967 | * pm_domain field points to the domain member of an object of type | |
968 | * struct generic_pm_domain representing a power domain consisting of I/O | |
969 | * devices. | |
970 | */ | |
971 | static int pm_genpd_freeze_noirq(struct device *dev) | |
972 | { | |
973 | struct generic_pm_domain *genpd; | |
122a2237 | 974 | int ret = 0; |
596ba34b RW |
975 | |
976 | dev_dbg(dev, "%s()\n", __func__); | |
977 | ||
978 | genpd = dev_to_genpd(dev); | |
979 | if (IS_ERR(genpd)) | |
980 | return -EINVAL; | |
981 | ||
122a2237 UH |
982 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
983 | ret = pm_runtime_force_suspend(dev); | |
984 | ||
985 | return ret; | |
0496c8ae | 986 | } |
596ba34b | 987 | |
0496c8ae RW |
988 | /** |
989 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
990 | * @dev: Device to thaw. | |
991 | * | |
992 | * Start the device, unless power has been removed from the domain already | |
993 | * before the system transition. | |
994 | */ | |
995 | static int pm_genpd_thaw_noirq(struct device *dev) | |
996 | { | |
997 | struct generic_pm_domain *genpd; | |
122a2237 | 998 | int ret = 0; |
596ba34b | 999 | |
0496c8ae | 1000 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1001 | |
0496c8ae RW |
1002 | genpd = dev_to_genpd(dev); |
1003 | if (IS_ERR(genpd)) | |
1004 | return -EINVAL; | |
1005 | ||
122a2237 UH |
1006 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1007 | ret = pm_runtime_force_resume(dev); | |
1008 | ||
1009 | return ret; | |
596ba34b RW |
1010 | } |
1011 | ||
596ba34b | 1012 | /** |
0496c8ae | 1013 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1014 | * @dev: Device to resume. |
1015 | * | |
0496c8ae RW |
1016 | * Make sure the domain will be in the same power state as before the |
1017 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1018 | */ |
1019 | static int pm_genpd_restore_noirq(struct device *dev) | |
1020 | { | |
1021 | struct generic_pm_domain *genpd; | |
122a2237 | 1022 | int ret = 0; |
596ba34b RW |
1023 | |
1024 | dev_dbg(dev, "%s()\n", __func__); | |
1025 | ||
1026 | genpd = dev_to_genpd(dev); | |
1027 | if (IS_ERR(genpd)) | |
1028 | return -EINVAL; | |
1029 | ||
1030 | /* | |
65533bbf RW |
1031 | * At this point suspended_count == 0 means we are being run for the |
1032 | * first time for the given domain in the present cycle. | |
596ba34b | 1033 | */ |
0883ac03 | 1034 | genpd_lock(genpd); |
39dd0f23 | 1035 | if (genpd->suspended_count++ == 0) |
596ba34b | 1036 | /* |
65533bbf | 1037 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1038 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1039 | * so that it tries to power it on in case it was really off. |
596ba34b | 1040 | */ |
65533bbf | 1041 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1042 | |
0883ac03 UH |
1043 | genpd_sync_power_on(genpd, true, 0); |
1044 | genpd_unlock(genpd); | |
596ba34b | 1045 | |
122a2237 UH |
1046 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1047 | ret = pm_runtime_force_resume(dev); | |
1048 | ||
1049 | return ret; | |
596ba34b RW |
1050 | } |
1051 | ||
1052 | /** | |
1053 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1054 | * @dev: Device to complete the transition of. | |
1055 | * | |
1056 | * Complete a power transition of a device (during a system-wide power | |
1057 | * transition) under the assumption that its pm_domain field points to the | |
1058 | * domain member of an object of type struct generic_pm_domain representing | |
1059 | * a power domain consisting of I/O devices. | |
1060 | */ | |
1061 | static void pm_genpd_complete(struct device *dev) | |
1062 | { | |
1063 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1064 | |
1065 | dev_dbg(dev, "%s()\n", __func__); | |
1066 | ||
1067 | genpd = dev_to_genpd(dev); | |
1068 | if (IS_ERR(genpd)) | |
1069 | return; | |
1070 | ||
4d23a5e8 UH |
1071 | pm_generic_complete(dev); |
1072 | ||
35241d12 | 1073 | genpd_lock(genpd); |
596ba34b | 1074 | |
39dd0f23 | 1075 | genpd->prepared_count--; |
4d23a5e8 UH |
1076 | if (!genpd->prepared_count) |
1077 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1078 | |
35241d12 | 1079 | genpd_unlock(genpd); |
596ba34b RW |
1080 | } |
1081 | ||
77f827de | 1082 | /** |
d47e6464 | 1083 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1084 | * @dev: Device that normally is marked as "always on" to switch power for. |
1085 | * | |
1086 | * This routine may only be called during the system core (syscore) suspend or | |
1087 | * resume phase for devices whose "always on" flags are set. | |
1088 | */ | |
d47e6464 | 1089 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1090 | { |
1091 | struct generic_pm_domain *genpd; | |
1092 | ||
1093 | genpd = dev_to_genpd(dev); | |
1094 | if (!pm_genpd_present(genpd)) | |
1095 | return; | |
1096 | ||
1097 | if (suspend) { | |
1098 | genpd->suspended_count++; | |
0883ac03 | 1099 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1100 | } else { |
0883ac03 | 1101 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1102 | genpd->suspended_count--; |
1103 | } | |
1104 | } | |
d47e6464 UH |
1105 | |
1106 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1107 | { | |
1108 | genpd_syscore_switch(dev, true); | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1111 | ||
1112 | void pm_genpd_syscore_poweron(struct device *dev) | |
1113 | { | |
1114 | genpd_syscore_switch(dev, false); | |
1115 | } | |
1116 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1117 | |
d30d819d | 1118 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1119 | |
1120 | #define pm_genpd_prepare NULL | |
596ba34b RW |
1121 | #define pm_genpd_suspend_noirq NULL |
1122 | #define pm_genpd_resume_noirq NULL | |
596ba34b RW |
1123 | #define pm_genpd_freeze_noirq NULL |
1124 | #define pm_genpd_thaw_noirq NULL | |
596ba34b | 1125 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1126 | #define pm_genpd_complete NULL |
1127 | ||
1128 | #endif /* CONFIG_PM_SLEEP */ | |
1129 | ||
f104e1e5 UH |
1130 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1131 | struct generic_pm_domain *genpd, | |
1132 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1133 | { |
1134 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1135 | int ret; |
1136 | ||
1137 | ret = dev_pm_get_subsys_data(dev); | |
1138 | if (ret) | |
1139 | return ERR_PTR(ret); | |
1d5fcfec RW |
1140 | |
1141 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1142 | if (!gpd_data) { |
1143 | ret = -ENOMEM; | |
1144 | goto err_put; | |
1145 | } | |
1d5fcfec | 1146 | |
f104e1e5 UH |
1147 | if (td) |
1148 | gpd_data->td = *td; | |
1149 | ||
1150 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1151 | gpd_data->td.constraint_changed = true; |
1152 | gpd_data->td.effective_constraint_ns = -1; | |
1153 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1154 | ||
1155 | spin_lock_irq(&dev->power.lock); | |
1156 | ||
1157 | if (dev->power.subsys_data->domain_data) { | |
1158 | ret = -EINVAL; | |
1159 | goto err_free; | |
1160 | } | |
1161 | ||
1162 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1163 | |
1164 | spin_unlock_irq(&dev->power.lock); | |
1165 | ||
989561de TV |
1166 | dev_pm_domain_set(dev, &genpd->domain); |
1167 | ||
1d5fcfec | 1168 | return gpd_data; |
3e235685 | 1169 | |
f104e1e5 UH |
1170 | err_free: |
1171 | spin_unlock_irq(&dev->power.lock); | |
1172 | kfree(gpd_data); | |
3e235685 UH |
1173 | err_put: |
1174 | dev_pm_put_subsys_data(dev); | |
1175 | return ERR_PTR(ret); | |
1d5fcfec RW |
1176 | } |
1177 | ||
49d400c7 UH |
1178 | static void genpd_free_dev_data(struct device *dev, |
1179 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1180 | { |
989561de TV |
1181 | dev_pm_domain_set(dev, NULL); |
1182 | ||
f104e1e5 UH |
1183 | spin_lock_irq(&dev->power.lock); |
1184 | ||
f104e1e5 UH |
1185 | dev->power.subsys_data->domain_data = NULL; |
1186 | ||
1187 | spin_unlock_irq(&dev->power.lock); | |
1188 | ||
1d5fcfec | 1189 | kfree(gpd_data); |
3e235685 | 1190 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1191 | } |
1192 | ||
19efa5ff JH |
1193 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1194 | struct gpd_timing_data *td) | |
f721889f | 1195 | { |
c0356db7 | 1196 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1197 | int ret = 0; |
1198 | ||
1199 | dev_dbg(dev, "%s()\n", __func__); | |
1200 | ||
1201 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1202 | return -EINVAL; | |
1203 | ||
f104e1e5 | 1204 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1205 | if (IS_ERR(gpd_data)) |
1206 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1207 | |
35241d12 | 1208 | genpd_lock(genpd); |
f721889f | 1209 | |
596ba34b RW |
1210 | if (genpd->prepared_count > 0) { |
1211 | ret = -EAGAIN; | |
1212 | goto out; | |
1213 | } | |
1214 | ||
b472c2fa UH |
1215 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1216 | if (ret) | |
1217 | goto out; | |
d79b6fe1 | 1218 | |
14b53064 UH |
1219 | genpd->device_count++; |
1220 | genpd->max_off_time_changed = true; | |
1221 | ||
1d5fcfec | 1222 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1223 | |
f721889f | 1224 | out: |
35241d12 | 1225 | genpd_unlock(genpd); |
f721889f | 1226 | |
c0356db7 UH |
1227 | if (ret) |
1228 | genpd_free_dev_data(dev, gpd_data); | |
1229 | else | |
1230 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1231 | |
f721889f RW |
1232 | return ret; |
1233 | } | |
19efa5ff JH |
1234 | |
1235 | /** | |
1236 | * __pm_genpd_add_device - Add a device to an I/O PM domain. | |
1237 | * @genpd: PM domain to add the device to. | |
1238 | * @dev: Device to be added. | |
1239 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1240 | */ | |
1241 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, | |
1242 | struct gpd_timing_data *td) | |
1243 | { | |
1244 | int ret; | |
1245 | ||
1246 | mutex_lock(&gpd_list_lock); | |
1247 | ret = genpd_add_device(genpd, dev, td); | |
1248 | mutex_unlock(&gpd_list_lock); | |
1249 | ||
1250 | return ret; | |
1251 | } | |
24c96dc7 | 1252 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f | 1253 | |
85168d56 UH |
1254 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1255 | struct device *dev) | |
f721889f | 1256 | { |
6ff7bb0d | 1257 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1258 | struct pm_domain_data *pdd; |
efa69025 | 1259 | int ret = 0; |
f721889f RW |
1260 | |
1261 | dev_dbg(dev, "%s()\n", __func__); | |
1262 | ||
c0356db7 UH |
1263 | pdd = dev->power.subsys_data->domain_data; |
1264 | gpd_data = to_gpd_data(pdd); | |
1265 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1266 | ||
35241d12 | 1267 | genpd_lock(genpd); |
f721889f | 1268 | |
596ba34b RW |
1269 | if (genpd->prepared_count > 0) { |
1270 | ret = -EAGAIN; | |
1271 | goto out; | |
1272 | } | |
1273 | ||
6ff7bb0d RW |
1274 | genpd->device_count--; |
1275 | genpd->max_off_time_changed = true; | |
1276 | ||
d79b6fe1 | 1277 | if (genpd->detach_dev) |
c16561e8 | 1278 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1279 | |
efa69025 | 1280 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1281 | |
35241d12 | 1282 | genpd_unlock(genpd); |
6ff7bb0d | 1283 | |
c1dbe2fb | 1284 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1285 | |
6ff7bb0d | 1286 | return 0; |
f721889f | 1287 | |
596ba34b | 1288 | out: |
35241d12 | 1289 | genpd_unlock(genpd); |
c0356db7 | 1290 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1291 | |
1292 | return ret; | |
1293 | } | |
85168d56 UH |
1294 | |
1295 | /** | |
1296 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1297 | * @genpd: PM domain to remove the device from. | |
1298 | * @dev: Device to be removed. | |
1299 | */ | |
1300 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1301 | struct device *dev) | |
1302 | { | |
1303 | if (!genpd || genpd != genpd_lookup_dev(dev)) | |
1304 | return -EINVAL; | |
1305 | ||
1306 | return genpd_remove_device(genpd, dev); | |
1307 | } | |
24c96dc7 | 1308 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1309 | |
19efa5ff JH |
1310 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1311 | struct generic_pm_domain *subdomain) | |
f721889f | 1312 | { |
2547923d | 1313 | struct gpd_link *link, *itr; |
f721889f RW |
1314 | int ret = 0; |
1315 | ||
fb7268be RW |
1316 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1317 | || genpd == subdomain) | |
f721889f RW |
1318 | return -EINVAL; |
1319 | ||
d716f479 LI |
1320 | /* |
1321 | * If the domain can be powered on/off in an IRQ safe | |
1322 | * context, ensure that the subdomain can also be | |
1323 | * powered on/off in that context. | |
1324 | */ | |
1325 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1326 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1327 | genpd->name, subdomain->name); |
1328 | return -EINVAL; | |
1329 | } | |
1330 | ||
2547923d LI |
1331 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1332 | if (!link) | |
1333 | return -ENOMEM; | |
1334 | ||
35241d12 LI |
1335 | genpd_lock(subdomain); |
1336 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1337 | |
41e2c8e0 | 1338 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1339 | ret = -EINVAL; |
1340 | goto out; | |
1341 | } | |
1342 | ||
2547923d LI |
1343 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1344 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1345 | ret = -EINVAL; |
1346 | goto out; | |
1347 | } | |
1348 | } | |
1349 | ||
5063ce15 RW |
1350 | link->master = genpd; |
1351 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1352 | link->slave = subdomain; |
1353 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1354 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1355 | genpd_sd_counter_inc(genpd); |
f721889f | 1356 | |
f721889f | 1357 | out: |
35241d12 LI |
1358 | genpd_unlock(genpd); |
1359 | genpd_unlock(subdomain); | |
2547923d LI |
1360 | if (ret) |
1361 | kfree(link); | |
f721889f RW |
1362 | return ret; |
1363 | } | |
19efa5ff JH |
1364 | |
1365 | /** | |
1366 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1367 | * @genpd: Master PM domain to add the subdomain to. | |
1368 | * @subdomain: Subdomain to be added. | |
1369 | */ | |
1370 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1371 | struct generic_pm_domain *subdomain) | |
1372 | { | |
1373 | int ret; | |
1374 | ||
1375 | mutex_lock(&gpd_list_lock); | |
1376 | ret = genpd_add_subdomain(genpd, subdomain); | |
1377 | mutex_unlock(&gpd_list_lock); | |
1378 | ||
1379 | return ret; | |
1380 | } | |
d60ee966 | 1381 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1382 | |
1383 | /** | |
1384 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1385 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1386 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1387 | */ |
1388 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1389 | struct generic_pm_domain *subdomain) |
f721889f | 1390 | { |
5063ce15 | 1391 | struct gpd_link *link; |
f721889f RW |
1392 | int ret = -EINVAL; |
1393 | ||
5063ce15 | 1394 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1395 | return -EINVAL; |
1396 | ||
35241d12 LI |
1397 | genpd_lock(subdomain); |
1398 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1399 | |
beda5fc1 | 1400 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1401 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1402 | subdomain->name); | |
1403 | ret = -EBUSY; | |
1404 | goto out; | |
1405 | } | |
1406 | ||
5063ce15 RW |
1407 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1408 | if (link->slave != subdomain) | |
f721889f RW |
1409 | continue; |
1410 | ||
5063ce15 RW |
1411 | list_del(&link->master_node); |
1412 | list_del(&link->slave_node); | |
1413 | kfree(link); | |
41e2c8e0 | 1414 | if (genpd_status_on(subdomain)) |
f721889f RW |
1415 | genpd_sd_counter_dec(genpd); |
1416 | ||
f721889f RW |
1417 | ret = 0; |
1418 | break; | |
1419 | } | |
1420 | ||
30e7a65b | 1421 | out: |
35241d12 LI |
1422 | genpd_unlock(genpd); |
1423 | genpd_unlock(subdomain); | |
f721889f RW |
1424 | |
1425 | return ret; | |
1426 | } | |
d60ee966 | 1427 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1428 | |
59d65b73 LI |
1429 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1430 | { | |
1431 | struct genpd_power_state *state; | |
1432 | ||
1433 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1434 | if (!state) | |
1435 | return -ENOMEM; | |
1436 | ||
1437 | genpd->states = state; | |
1438 | genpd->state_count = 1; | |
1439 | genpd->free = state; | |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
d716f479 LI |
1444 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1445 | { | |
1446 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1447 | spin_lock_init(&genpd->slock); | |
1448 | genpd->lock_ops = &genpd_spin_ops; | |
1449 | } else { | |
1450 | mutex_init(&genpd->mlock); | |
1451 | genpd->lock_ops = &genpd_mtx_ops; | |
1452 | } | |
1453 | } | |
1454 | ||
f721889f RW |
1455 | /** |
1456 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1457 | * @genpd: PM domain object to initialize. | |
1458 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1459 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1460 | * |
1461 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1462 | */ |
7eb231c3 UH |
1463 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1464 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1465 | { |
59d65b73 LI |
1466 | int ret; |
1467 | ||
f721889f | 1468 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1469 | return -EINVAL; |
f721889f | 1470 | |
5063ce15 RW |
1471 | INIT_LIST_HEAD(&genpd->master_links); |
1472 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1473 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1474 | genpd_lock_init(genpd); |
f721889f RW |
1475 | genpd->gov = gov; |
1476 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1477 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1478 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1479 | genpd->device_count = 0; |
221e9b58 | 1480 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1481 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1482 | genpd->provider = NULL; |
1483 | genpd->has_provider = false; | |
795bd2e7 UH |
1484 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1485 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
596ba34b | 1486 | genpd->domain.ops.prepare = pm_genpd_prepare; |
596ba34b RW |
1487 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1488 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
596ba34b RW |
1489 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1490 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
d23b9b00 | 1491 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1492 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
596ba34b | 1493 | genpd->domain.ops.complete = pm_genpd_complete; |
c11f6f5b UH |
1494 | |
1495 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1496 | genpd->dev_ops.stop = pm_clk_suspend; | |
1497 | genpd->dev_ops.start = pm_clk_resume; | |
1498 | } | |
1499 | ||
ffaa42e8 UH |
1500 | /* Always-on domains must be powered on at initialization. */ |
1501 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1502 | return -EINVAL; | |
1503 | ||
fc5cbf0c | 1504 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1505 | if (genpd->state_count == 0) { |
1506 | ret = genpd_set_default_power_state(genpd); | |
1507 | if (ret) | |
1508 | return ret; | |
1509 | } | |
fc5cbf0c | 1510 | |
5125bbf3 RW |
1511 | mutex_lock(&gpd_list_lock); |
1512 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1513 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1514 | |
1515 | return 0; | |
5125bbf3 | 1516 | } |
be5ed55d | 1517 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1518 | |
3fe57710 JH |
1519 | static int genpd_remove(struct generic_pm_domain *genpd) |
1520 | { | |
1521 | struct gpd_link *l, *link; | |
1522 | ||
1523 | if (IS_ERR_OR_NULL(genpd)) | |
1524 | return -EINVAL; | |
1525 | ||
35241d12 | 1526 | genpd_lock(genpd); |
3fe57710 JH |
1527 | |
1528 | if (genpd->has_provider) { | |
35241d12 | 1529 | genpd_unlock(genpd); |
3fe57710 JH |
1530 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1531 | return -EBUSY; | |
1532 | } | |
1533 | ||
1534 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1535 | genpd_unlock(genpd); |
3fe57710 JH |
1536 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1537 | return -EBUSY; | |
1538 | } | |
1539 | ||
1540 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1541 | list_del(&link->master_node); | |
1542 | list_del(&link->slave_node); | |
1543 | kfree(link); | |
1544 | } | |
1545 | ||
1546 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1547 | genpd_unlock(genpd); |
3fe57710 | 1548 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1549 | kfree(genpd->free); |
3fe57710 JH |
1550 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | /** | |
1556 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1557 | * @genpd: Pointer to PM domain that is to be removed. | |
1558 | * | |
1559 | * To remove the PM domain, this function: | |
1560 | * - Removes the PM domain as a subdomain to any parent domains, | |
1561 | * if it was added. | |
1562 | * - Removes the PM domain from the list of registered PM domains. | |
1563 | * | |
1564 | * The PM domain will only be removed, if the associated provider has | |
1565 | * been removed, it is not a parent to any other PM domain and has no | |
1566 | * devices associated with it. | |
1567 | */ | |
1568 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1569 | { | |
1570 | int ret; | |
1571 | ||
1572 | mutex_lock(&gpd_list_lock); | |
1573 | ret = genpd_remove(genpd); | |
1574 | mutex_unlock(&gpd_list_lock); | |
1575 | ||
1576 | return ret; | |
1577 | } | |
1578 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1579 | ||
aa42240a | 1580 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc JH |
1581 | |
1582 | typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, | |
1583 | void *data); | |
1584 | ||
aa42240a TF |
1585 | /* |
1586 | * Device Tree based PM domain providers. | |
1587 | * | |
1588 | * The code below implements generic device tree based PM domain providers that | |
1589 | * bind device tree nodes with generic PM domains registered in the system. | |
1590 | * | |
1591 | * Any driver that registers generic PM domains and needs to support binding of | |
1592 | * devices to these domains is supposed to register a PM domain provider, which | |
1593 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1594 | * | |
1595 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1596 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1597 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1598 | * index. |
1599 | */ | |
1600 | ||
1601 | /** | |
1602 | * struct of_genpd_provider - PM domain provider registration structure | |
1603 | * @link: Entry in global list of PM domain providers | |
1604 | * @node: Pointer to device tree node of PM domain provider | |
1605 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1606 | * into a PM domain. | |
1607 | * @data: context pointer to be passed into @xlate callback | |
1608 | */ | |
1609 | struct of_genpd_provider { | |
1610 | struct list_head link; | |
1611 | struct device_node *node; | |
1612 | genpd_xlate_t xlate; | |
1613 | void *data; | |
1614 | }; | |
1615 | ||
1616 | /* List of registered PM domain providers. */ | |
1617 | static LIST_HEAD(of_genpd_providers); | |
1618 | /* Mutex to protect the list above. */ | |
1619 | static DEFINE_MUTEX(of_genpd_mutex); | |
1620 | ||
1621 | /** | |
892ebdcc | 1622 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1623 | * @genpdspec: OF phandle args to map into a PM domain |
1624 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1625 | * | |
1626 | * This is a generic xlate function that can be used to model PM domains that | |
1627 | * have their own device tree nodes. The private data of xlate function needs | |
1628 | * to be a valid pointer to struct generic_pm_domain. | |
1629 | */ | |
892ebdcc | 1630 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1631 | struct of_phandle_args *genpdspec, |
1632 | void *data) | |
1633 | { | |
1634 | if (genpdspec->args_count != 0) | |
1635 | return ERR_PTR(-EINVAL); | |
1636 | return data; | |
1637 | } | |
aa42240a TF |
1638 | |
1639 | /** | |
892ebdcc | 1640 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1641 | * @genpdspec: OF phandle args to map into a PM domain |
1642 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1643 | * | |
1644 | * This is a generic xlate function that can be used to model simple PM domain | |
1645 | * controllers that have one device tree node and provide multiple PM domains. | |
1646 | * A single cell is used as an index into an array of PM domains specified in | |
1647 | * the genpd_onecell_data struct when registering the provider. | |
1648 | */ | |
892ebdcc | 1649 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1650 | struct of_phandle_args *genpdspec, |
1651 | void *data) | |
1652 | { | |
1653 | struct genpd_onecell_data *genpd_data = data; | |
1654 | unsigned int idx = genpdspec->args[0]; | |
1655 | ||
1656 | if (genpdspec->args_count != 1) | |
1657 | return ERR_PTR(-EINVAL); | |
1658 | ||
1659 | if (idx >= genpd_data->num_domains) { | |
1660 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1661 | return ERR_PTR(-EINVAL); | |
1662 | } | |
1663 | ||
1664 | if (!genpd_data->domains[idx]) | |
1665 | return ERR_PTR(-ENOENT); | |
1666 | ||
1667 | return genpd_data->domains[idx]; | |
1668 | } | |
aa42240a TF |
1669 | |
1670 | /** | |
892ebdcc | 1671 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1672 | * @np: Device node pointer associated with the PM domain provider. |
1673 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1674 | * @data: Context pointer for @xlate callback. | |
1675 | */ | |
892ebdcc JH |
1676 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1677 | void *data) | |
aa42240a TF |
1678 | { |
1679 | struct of_genpd_provider *cp; | |
1680 | ||
1681 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1682 | if (!cp) | |
1683 | return -ENOMEM; | |
1684 | ||
1685 | cp->node = of_node_get(np); | |
1686 | cp->data = data; | |
1687 | cp->xlate = xlate; | |
1688 | ||
1689 | mutex_lock(&of_genpd_mutex); | |
1690 | list_add(&cp->link, &of_genpd_providers); | |
1691 | mutex_unlock(&of_genpd_mutex); | |
1692 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1693 | ||
1694 | return 0; | |
1695 | } | |
892ebdcc JH |
1696 | |
1697 | /** | |
1698 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1699 | * @np: Device node pointer associated with the PM domain provider. | |
1700 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1701 | */ | |
1702 | int of_genpd_add_provider_simple(struct device_node *np, | |
1703 | struct generic_pm_domain *genpd) | |
1704 | { | |
0159ec67 JH |
1705 | int ret = -EINVAL; |
1706 | ||
1707 | if (!np || !genpd) | |
1708 | return -EINVAL; | |
1709 | ||
1710 | mutex_lock(&gpd_list_lock); | |
1711 | ||
8ce95844 | 1712 | if (pm_genpd_present(genpd)) { |
0159ec67 | 1713 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
8ce95844 VK |
1714 | if (!ret) { |
1715 | genpd->provider = &np->fwnode; | |
1716 | genpd->has_provider = true; | |
1717 | } | |
de0aa06d JH |
1718 | } |
1719 | ||
0159ec67 JH |
1720 | mutex_unlock(&gpd_list_lock); |
1721 | ||
1722 | return ret; | |
892ebdcc JH |
1723 | } |
1724 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1725 | ||
1726 | /** | |
1727 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1728 | * @np: Device node pointer associated with the PM domain provider. | |
1729 | * @data: Pointer to the data associated with the PM domain provider. | |
1730 | */ | |
1731 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1732 | struct genpd_onecell_data *data) | |
1733 | { | |
0159ec67 | 1734 | unsigned int i; |
de0aa06d | 1735 | int ret = -EINVAL; |
0159ec67 JH |
1736 | |
1737 | if (!np || !data) | |
1738 | return -EINVAL; | |
1739 | ||
1740 | mutex_lock(&gpd_list_lock); | |
1741 | ||
1742 | for (i = 0; i < data->num_domains; i++) { | |
609bed67 TV |
1743 | if (!data->domains[i]) |
1744 | continue; | |
de0aa06d JH |
1745 | if (!pm_genpd_present(data->domains[i])) |
1746 | goto error; | |
1747 | ||
1748 | data->domains[i]->provider = &np->fwnode; | |
1749 | data->domains[i]->has_provider = true; | |
0159ec67 JH |
1750 | } |
1751 | ||
1752 | ret = genpd_add_provider(np, genpd_xlate_onecell, data); | |
de0aa06d JH |
1753 | if (ret < 0) |
1754 | goto error; | |
1755 | ||
1756 | mutex_unlock(&gpd_list_lock); | |
1757 | ||
1758 | return 0; | |
1759 | ||
1760 | error: | |
1761 | while (i--) { | |
609bed67 TV |
1762 | if (!data->domains[i]) |
1763 | continue; | |
de0aa06d JH |
1764 | data->domains[i]->provider = NULL; |
1765 | data->domains[i]->has_provider = false; | |
1766 | } | |
0159ec67 JH |
1767 | |
1768 | mutex_unlock(&gpd_list_lock); | |
1769 | ||
1770 | return ret; | |
892ebdcc JH |
1771 | } |
1772 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1773 | |
1774 | /** | |
1775 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1776 | * @np: Device node pointer associated with the PM domain provider | |
1777 | */ | |
1778 | void of_genpd_del_provider(struct device_node *np) | |
1779 | { | |
1780 | struct of_genpd_provider *cp; | |
de0aa06d | 1781 | struct generic_pm_domain *gpd; |
aa42240a | 1782 | |
de0aa06d | 1783 | mutex_lock(&gpd_list_lock); |
aa42240a TF |
1784 | mutex_lock(&of_genpd_mutex); |
1785 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1786 | if (cp->node == np) { | |
de0aa06d JH |
1787 | /* |
1788 | * For each PM domain associated with the | |
1789 | * provider, set the 'has_provider' to false | |
1790 | * so that the PM domain can be safely removed. | |
1791 | */ | |
1792 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
1793 | if (gpd->provider == &np->fwnode) | |
1794 | gpd->has_provider = false; | |
1795 | ||
aa42240a TF |
1796 | list_del(&cp->link); |
1797 | of_node_put(cp->node); | |
1798 | kfree(cp); | |
1799 | break; | |
1800 | } | |
1801 | } | |
1802 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 1803 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
1804 | } |
1805 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1806 | ||
1807 | /** | |
f58d4e5a | 1808 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
1809 | * @genpdspec: OF phandle args to use for look-up |
1810 | * | |
1811 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1812 | * found, uses xlate function of the provider to map phandle args to a PM | |
1813 | * domain. | |
1814 | * | |
1815 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1816 | * on failure. | |
1817 | */ | |
f58d4e5a | 1818 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
1819 | struct of_phandle_args *genpdspec) |
1820 | { | |
1821 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1822 | struct of_genpd_provider *provider; | |
1823 | ||
41795a8a JH |
1824 | if (!genpdspec) |
1825 | return ERR_PTR(-EINVAL); | |
1826 | ||
aa42240a TF |
1827 | mutex_lock(&of_genpd_mutex); |
1828 | ||
1829 | /* Check if we have such a provider in our array */ | |
1830 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1831 | if (provider->node == genpdspec->np) | |
1832 | genpd = provider->xlate(genpdspec, provider->data); | |
1833 | if (!IS_ERR(genpd)) | |
1834 | break; | |
1835 | } | |
1836 | ||
1837 | mutex_unlock(&of_genpd_mutex); | |
1838 | ||
1839 | return genpd; | |
1840 | } | |
1841 | ||
ec69572b JH |
1842 | /** |
1843 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
1844 | * @genpdspec: OF phandle args to use for look-up PM domain | |
1845 | * @dev: Device to be added. | |
1846 | * | |
1847 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
1848 | * the device to the PM domain. Returns a negative error code on failure. | |
1849 | */ | |
1850 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
1851 | { | |
1852 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
1853 | int ret; |
1854 | ||
1855 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1856 | |
f58d4e5a | 1857 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
1858 | if (IS_ERR(genpd)) { |
1859 | ret = PTR_ERR(genpd); | |
1860 | goto out; | |
1861 | } | |
1862 | ||
1863 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 1864 | |
19efa5ff JH |
1865 | out: |
1866 | mutex_unlock(&gpd_list_lock); | |
1867 | ||
1868 | return ret; | |
ec69572b JH |
1869 | } |
1870 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
1871 | ||
1872 | /** | |
1873 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1874 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
1875 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
1876 | * | |
1877 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
1878 | * provided and adds the subdomain to the parent PM domain. Returns a | |
1879 | * negative error code on failure. | |
1880 | */ | |
1881 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
1882 | struct of_phandle_args *subdomain_spec) | |
1883 | { | |
1884 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
1885 | int ret; |
1886 | ||
1887 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1888 | |
f58d4e5a | 1889 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
1890 | if (IS_ERR(parent)) { |
1891 | ret = PTR_ERR(parent); | |
1892 | goto out; | |
1893 | } | |
ec69572b | 1894 | |
f58d4e5a | 1895 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
1896 | if (IS_ERR(subdomain)) { |
1897 | ret = PTR_ERR(subdomain); | |
1898 | goto out; | |
1899 | } | |
1900 | ||
1901 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 1902 | |
19efa5ff JH |
1903 | out: |
1904 | mutex_unlock(&gpd_list_lock); | |
1905 | ||
1906 | return ret; | |
ec69572b JH |
1907 | } |
1908 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
1909 | ||
17926551 JH |
1910 | /** |
1911 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
1912 | * @provider: Pointer to device structure associated with provider | |
1913 | * | |
1914 | * Find the last PM domain that was added by a particular provider and | |
1915 | * remove this PM domain from the list of PM domains. The provider is | |
1916 | * identified by the 'provider' device structure that is passed. The PM | |
1917 | * domain will only be removed, if the provider associated with domain | |
1918 | * has been removed. | |
1919 | * | |
1920 | * Returns a valid pointer to struct generic_pm_domain on success or | |
1921 | * ERR_PTR() on failure. | |
1922 | */ | |
1923 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
1924 | { | |
1925 | struct generic_pm_domain *gpd, *genpd = ERR_PTR(-ENOENT); | |
1926 | int ret; | |
1927 | ||
1928 | if (IS_ERR_OR_NULL(np)) | |
1929 | return ERR_PTR(-EINVAL); | |
1930 | ||
1931 | mutex_lock(&gpd_list_lock); | |
1932 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1933 | if (gpd->provider == &np->fwnode) { | |
1934 | ret = genpd_remove(gpd); | |
1935 | genpd = ret ? ERR_PTR(ret) : gpd; | |
1936 | break; | |
1937 | } | |
1938 | } | |
1939 | mutex_unlock(&gpd_list_lock); | |
1940 | ||
1941 | return genpd; | |
1942 | } | |
1943 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
1944 | ||
aa42240a TF |
1945 | /** |
1946 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1947 | * @dev: Device to detach. |
aa42240a TF |
1948 | * @power_off: Currently not used |
1949 | * | |
1950 | * Try to locate a corresponding generic PM domain, which the device was | |
1951 | * attached to previously. If such is found, the device is detached from it. | |
1952 | */ | |
1953 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1954 | { | |
446d999c | 1955 | struct generic_pm_domain *pd; |
93af5e93 | 1956 | unsigned int i; |
aa42240a TF |
1957 | int ret = 0; |
1958 | ||
85168d56 UH |
1959 | pd = dev_to_genpd(dev); |
1960 | if (IS_ERR(pd)) | |
aa42240a TF |
1961 | return; |
1962 | ||
1963 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1964 | ||
93af5e93 | 1965 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 1966 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
1967 | if (ret != -EAGAIN) |
1968 | break; | |
93af5e93 GU |
1969 | |
1970 | mdelay(i); | |
aa42240a TF |
1971 | cond_resched(); |
1972 | } | |
1973 | ||
1974 | if (ret < 0) { | |
1975 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1976 | pd->name, ret); | |
1977 | return; | |
1978 | } | |
1979 | ||
1980 | /* Check if PM domain can be powered off after removing this device. */ | |
1981 | genpd_queue_power_off_work(pd); | |
1982 | } | |
1983 | ||
632f7ce3 RK |
1984 | static void genpd_dev_pm_sync(struct device *dev) |
1985 | { | |
1986 | struct generic_pm_domain *pd; | |
1987 | ||
1988 | pd = dev_to_genpd(dev); | |
1989 | if (IS_ERR(pd)) | |
1990 | return; | |
1991 | ||
1992 | genpd_queue_power_off_work(pd); | |
1993 | } | |
1994 | ||
aa42240a TF |
1995 | /** |
1996 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1997 | * @dev: Device to attach. | |
1998 | * | |
1999 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2000 | * attaches the device to retrieved pm_domain ops. | |
2001 | * | |
2002 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2003 | * backwards compatibility with existing DTBs. | |
2004 | * | |
311fa6ad JH |
2005 | * Returns 0 on successfully attached PM domain or negative error code. Note |
2006 | * that if a power-domain exists for the device, but it cannot be found or | |
2007 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
2008 | * probed and to re-try again later. | |
aa42240a TF |
2009 | */ |
2010 | int genpd_dev_pm_attach(struct device *dev) | |
2011 | { | |
2012 | struct of_phandle_args pd_args; | |
2013 | struct generic_pm_domain *pd; | |
93af5e93 | 2014 | unsigned int i; |
aa42240a TF |
2015 | int ret; |
2016 | ||
2017 | if (!dev->of_node) | |
2018 | return -ENODEV; | |
2019 | ||
2020 | if (dev->pm_domain) | |
2021 | return -EEXIST; | |
2022 | ||
2023 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2024 | "#power-domain-cells", 0, &pd_args); | |
2025 | if (ret < 0) { | |
2026 | if (ret != -ENOENT) | |
2027 | return ret; | |
2028 | ||
2029 | /* | |
2030 | * Try legacy Samsung-specific bindings | |
2031 | * (for backwards compatibility of DT ABI) | |
2032 | */ | |
2033 | pd_args.args_count = 0; | |
2034 | pd_args.np = of_parse_phandle(dev->of_node, | |
2035 | "samsung,power-domain", 0); | |
2036 | if (!pd_args.np) | |
2037 | return -ENOENT; | |
2038 | } | |
2039 | ||
19efa5ff | 2040 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2041 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2042 | of_node_put(pd_args.np); |
aa42240a | 2043 | if (IS_ERR(pd)) { |
19efa5ff | 2044 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2045 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2046 | __func__, PTR_ERR(pd)); | |
311fa6ad | 2047 | return -EPROBE_DEFER; |
aa42240a TF |
2048 | } |
2049 | ||
2050 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2051 | ||
93af5e93 | 2052 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
19efa5ff | 2053 | ret = genpd_add_device(pd, dev, NULL); |
aa42240a TF |
2054 | if (ret != -EAGAIN) |
2055 | break; | |
93af5e93 GU |
2056 | |
2057 | mdelay(i); | |
aa42240a TF |
2058 | cond_resched(); |
2059 | } | |
19efa5ff | 2060 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2061 | |
2062 | if (ret < 0) { | |
34994692 GU |
2063 | if (ret != -EPROBE_DEFER) |
2064 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2065 | pd->name, ret); | |
311fa6ad | 2066 | goto out; |
aa42240a TF |
2067 | } |
2068 | ||
2069 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2070 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2071 | |
35241d12 | 2072 | genpd_lock(pd); |
86e12eac | 2073 | ret = genpd_power_on(pd, 0); |
35241d12 | 2074 | genpd_unlock(pd); |
311fa6ad JH |
2075 | out: |
2076 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2077 | } |
2078 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
30f60428 LI |
2079 | |
2080 | static const struct of_device_id idle_state_match[] = { | |
598da548 | 2081 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2082 | { } |
2083 | }; | |
2084 | ||
2085 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2086 | struct device_node *state_node) | |
2087 | { | |
2088 | int err; | |
2089 | u32 residency; | |
2090 | u32 entry_latency, exit_latency; | |
2091 | const struct of_device_id *match_id; | |
2092 | ||
2093 | match_id = of_match_node(idle_state_match, state_node); | |
2094 | if (!match_id) | |
2095 | return -EINVAL; | |
2096 | ||
2097 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2098 | &entry_latency); | |
2099 | if (err) { | |
2100 | pr_debug(" * %s missing entry-latency-us property\n", | |
2101 | state_node->full_name); | |
2102 | return -EINVAL; | |
2103 | } | |
2104 | ||
2105 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2106 | &exit_latency); | |
2107 | if (err) { | |
2108 | pr_debug(" * %s missing exit-latency-us property\n", | |
2109 | state_node->full_name); | |
2110 | return -EINVAL; | |
2111 | } | |
2112 | ||
2113 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2114 | if (!err) | |
2115 | genpd_state->residency_ns = 1000 * residency; | |
2116 | ||
2117 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2118 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2119 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2120 | |
2121 | return 0; | |
2122 | } | |
2123 | ||
2124 | /** | |
2125 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2126 | * | |
2127 | * @dn: The genpd device node | |
2128 | * @states: The pointer to which the state array will be saved. | |
2129 | * @n: The count of elements in the array returned from this function. | |
2130 | * | |
2131 | * Returns the device states parsed from the OF node. The memory for the states | |
2132 | * is allocated by this function and is the responsibility of the caller to | |
2133 | * free the memory after use. | |
2134 | */ | |
2135 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2136 | struct genpd_power_state **states, int *n) | |
2137 | { | |
2138 | struct genpd_power_state *st; | |
2139 | struct device_node *np; | |
2140 | int i = 0; | |
2141 | int err, ret; | |
2142 | int count; | |
2143 | struct of_phandle_iterator it; | |
2144 | ||
2145 | count = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
a1fee00d | 2146 | if (count <= 0) |
30f60428 LI |
2147 | return -EINVAL; |
2148 | ||
2149 | st = kcalloc(count, sizeof(*st), GFP_KERNEL); | |
2150 | if (!st) | |
2151 | return -ENOMEM; | |
2152 | ||
2153 | /* Loop over the phandles until all the requested entry is found */ | |
2154 | of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) { | |
2155 | np = it.node; | |
2156 | ret = genpd_parse_state(&st[i++], np); | |
2157 | if (ret) { | |
2158 | pr_err | |
2159 | ("Parsing idle state node %s failed with err %d\n", | |
2160 | np->full_name, ret); | |
2161 | of_node_put(np); | |
2162 | kfree(st); | |
2163 | return ret; | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | *n = count; | |
2168 | *states = st; | |
2169 | ||
2170 | return 0; | |
2171 | } | |
2172 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2173 | ||
d30d819d | 2174 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2175 | |
2176 | ||
2177 | /*** debugfs support ***/ | |
2178 | ||
8b0510b5 | 2179 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2180 | #include <linux/pm.h> |
2181 | #include <linux/device.h> | |
2182 | #include <linux/debugfs.h> | |
2183 | #include <linux/seq_file.h> | |
2184 | #include <linux/init.h> | |
2185 | #include <linux/kobject.h> | |
2186 | static struct dentry *pm_genpd_debugfs_dir; | |
2187 | ||
2188 | /* | |
2189 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2190 | * from sysfs.c, so generalize it. |
2bd5306a | 2191 | */ |
2bd5306a MM |
2192 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2193 | { | |
2194 | static const char * const status_lookup[] = { | |
2195 | [RPM_ACTIVE] = "active", | |
2196 | [RPM_RESUMING] = "resuming", | |
2197 | [RPM_SUSPENDED] = "suspended", | |
2198 | [RPM_SUSPENDING] = "suspending" | |
2199 | }; | |
2200 | const char *p = ""; | |
2201 | ||
2202 | if (dev->power.runtime_error) | |
2203 | p = "error"; | |
2204 | else if (dev->power.disable_depth) | |
2205 | p = "unsupported"; | |
2206 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2207 | p = status_lookup[dev->power.runtime_status]; | |
2208 | else | |
2209 | WARN_ON(1); | |
2210 | ||
2211 | seq_puts(s, p); | |
2212 | } | |
2bd5306a MM |
2213 | |
2214 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2215 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2216 | { |
2217 | static const char * const status_lookup[] = { | |
2218 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2219 | [GPD_STATE_POWER_OFF] = "off" |
2220 | }; | |
2221 | struct pm_domain_data *pm_data; | |
2222 | const char *kobj_path; | |
2223 | struct gpd_link *link; | |
6954d432 | 2224 | char state[16]; |
2bd5306a MM |
2225 | int ret; |
2226 | ||
35241d12 | 2227 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2228 | if (ret) |
2229 | return -ERESTARTSYS; | |
2230 | ||
66a5ca4b | 2231 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2232 | goto exit; |
41e2c8e0 | 2233 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2234 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2235 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2236 | else |
6954d432 GU |
2237 | snprintf(state, sizeof(state), "%s", |
2238 | status_lookup[genpd->status]); | |
2239 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2240 | |
2241 | /* | |
2242 | * Modifications on the list require holding locks on both | |
2243 | * master and slave, so we are safe. | |
66a5ca4b | 2244 | * Also genpd->name is immutable. |
2bd5306a | 2245 | */ |
66a5ca4b | 2246 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2247 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2248 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2249 | seq_puts(s, ", "); |
2250 | } | |
2251 | ||
66a5ca4b | 2252 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2253 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2254 | genpd_is_irq_safe(genpd) ? | |
2255 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2256 | if (kobj_path == NULL) |
2257 | continue; | |
2258 | ||
2259 | seq_printf(s, "\n %-50s ", kobj_path); | |
2260 | rtpm_status_str(s, pm_data->dev); | |
2261 | kfree(kobj_path); | |
2262 | } | |
2263 | ||
2264 | seq_puts(s, "\n"); | |
2265 | exit: | |
35241d12 | 2266 | genpd_unlock(genpd); |
2bd5306a MM |
2267 | |
2268 | return 0; | |
2269 | } | |
2270 | ||
2271 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2272 | { | |
66a5ca4b | 2273 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2274 | int ret = 0; |
2275 | ||
15dec67a GU |
2276 | seq_puts(s, "domain status slaves\n"); |
2277 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2278 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2279 | ||
2280 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2281 | if (ret) | |
2282 | return -ERESTARTSYS; | |
2283 | ||
66a5ca4b KH |
2284 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2285 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2286 | if (ret) |
2287 | break; | |
2288 | } | |
2289 | mutex_unlock(&gpd_list_lock); | |
2290 | ||
2291 | return ret; | |
2292 | } | |
2293 | ||
2294 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2295 | { | |
2296 | return single_open(file, pm_genpd_summary_show, NULL); | |
2297 | } | |
2298 | ||
2299 | static const struct file_operations pm_genpd_summary_fops = { | |
2300 | .open = pm_genpd_summary_open, | |
2301 | .read = seq_read, | |
2302 | .llseek = seq_lseek, | |
2303 | .release = single_release, | |
2304 | }; | |
2305 | ||
2306 | static int __init pm_genpd_debug_init(void) | |
2307 | { | |
2308 | struct dentry *d; | |
2309 | ||
2310 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2311 | ||
2312 | if (!pm_genpd_debugfs_dir) | |
2313 | return -ENOMEM; | |
2314 | ||
2315 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2316 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2317 | if (!d) | |
2318 | return -ENOMEM; | |
2319 | ||
2320 | return 0; | |
2321 | } | |
2322 | late_initcall(pm_genpd_debug_init); | |
2323 | ||
2324 | static void __exit pm_genpd_debug_exit(void) | |
2325 | { | |
2326 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2327 | } | |
2328 | __exitcall(pm_genpd_debug_exit); | |
8b0510b5 | 2329 | #endif /* CONFIG_DEBUG_FS */ |