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