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 | ||
5248051b | 276 | /** |
86e12eac | 277 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 278 | * @genpd: PM domain to power up. |
0106ef51 | 279 | * @depth: nesting count for lockdep. |
5248051b | 280 | * |
5063ce15 | 281 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
282 | * resume a device belonging to it. |
283 | */ | |
86e12eac | 284 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 285 | { |
5063ce15 | 286 | struct gpd_link *link; |
5248051b RW |
287 | int ret = 0; |
288 | ||
39dd0f23 | 289 | if (genpd->status == GPD_STATE_ACTIVE) |
3f241775 | 290 | return 0; |
5248051b | 291 | |
5063ce15 RW |
292 | /* |
293 | * The list is guaranteed not to change while the loop below is being | |
294 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
295 | * with it. | |
296 | */ | |
297 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
298 | struct generic_pm_domain *master = link->master; |
299 | ||
300 | genpd_sd_counter_inc(master); | |
301 | ||
35241d12 | 302 | genpd_lock_nested(master, depth + 1); |
86e12eac | 303 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 304 | genpd_unlock(master); |
5248051b | 305 | |
5063ce15 | 306 | if (ret) { |
0106ef51 | 307 | genpd_sd_counter_dec(master); |
9e08cf42 | 308 | goto err; |
5063ce15 | 309 | } |
5248051b RW |
310 | } |
311 | ||
86e12eac | 312 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
313 | if (ret) |
314 | goto err; | |
5248051b | 315 | |
ba2bbfbf | 316 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 317 | return 0; |
9e08cf42 RW |
318 | |
319 | err: | |
29e47e21 UH |
320 | list_for_each_entry_continue_reverse(link, |
321 | &genpd->slave_links, | |
322 | slave_node) { | |
5063ce15 | 323 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
324 | genpd_queue_power_off_work(link->master); |
325 | } | |
9e08cf42 | 326 | |
3f241775 RW |
327 | return ret; |
328 | } | |
329 | ||
6ff7bb0d RW |
330 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
331 | unsigned long val, void *ptr) | |
332 | { | |
333 | struct generic_pm_domain_data *gpd_data; | |
334 | struct device *dev; | |
335 | ||
336 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 337 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
338 | |
339 | for (;;) { | |
340 | struct generic_pm_domain *genpd; | |
341 | struct pm_domain_data *pdd; | |
342 | ||
343 | spin_lock_irq(&dev->power.lock); | |
344 | ||
345 | pdd = dev->power.subsys_data ? | |
346 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 347 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
348 | to_gpd_data(pdd)->td.constraint_changed = true; |
349 | genpd = dev_to_genpd(dev); | |
350 | } else { | |
351 | genpd = ERR_PTR(-ENODATA); | |
352 | } | |
353 | ||
354 | spin_unlock_irq(&dev->power.lock); | |
355 | ||
356 | if (!IS_ERR(genpd)) { | |
35241d12 | 357 | genpd_lock(genpd); |
6ff7bb0d | 358 | genpd->max_off_time_changed = true; |
35241d12 | 359 | genpd_unlock(genpd); |
6ff7bb0d RW |
360 | } |
361 | ||
362 | dev = dev->parent; | |
363 | if (!dev || dev->power.ignore_children) | |
364 | break; | |
365 | } | |
366 | ||
367 | return NOTIFY_DONE; | |
368 | } | |
369 | ||
f721889f | 370 | /** |
86e12eac | 371 | * genpd_power_off - Remove power from a given PM domain. |
f721889f | 372 | * @genpd: PM domain to power down. |
f96b3c4f | 373 | * @is_async: PM domain is powered down from a scheduled work |
f721889f RW |
374 | * |
375 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 376 | * have been powered down, remove power from @genpd. |
f721889f | 377 | */ |
86e12eac | 378 | static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async) |
f721889f | 379 | { |
4605ab65 | 380 | struct pm_domain_data *pdd; |
5063ce15 | 381 | struct gpd_link *link; |
ba2bbfbf | 382 | unsigned int not_suspended = 0; |
f721889f | 383 | |
c6d22b37 RW |
384 | /* |
385 | * Do not try to power off the domain in the following situations: | |
386 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 387 | * (2) System suspend is in progress. |
c6d22b37 | 388 | */ |
3f241775 | 389 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 390 | || genpd->prepared_count > 0) |
f721889f RW |
391 | return 0; |
392 | ||
c4bb3160 | 393 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
394 | return -EBUSY; |
395 | ||
34b1f762 RW |
396 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
397 | enum pm_qos_flags_status stat; | |
398 | ||
399 | stat = dev_pm_qos_flags(pdd->dev, | |
400 | PM_QOS_FLAG_NO_POWER_OFF | |
401 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
402 | if (stat > PM_QOS_FLAGS_NONE) | |
403 | return -EBUSY; | |
404 | ||
d716f479 LI |
405 | /* |
406 | * Do not allow PM domain to be powered off, when an IRQ safe | |
407 | * device is part of a non-IRQ safe domain. | |
408 | */ | |
409 | if (!pm_runtime_suspended(pdd->dev) || | |
410 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
f721889f | 411 | not_suspended++; |
34b1f762 | 412 | } |
f721889f | 413 | |
f96b3c4f | 414 | if (not_suspended > 1 || (not_suspended == 1 && is_async)) |
f721889f RW |
415 | return -EBUSY; |
416 | ||
417 | if (genpd->gov && genpd->gov->power_down_ok) { | |
418 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
419 | return -EAGAIN; | |
420 | } | |
421 | ||
3c07cbc4 | 422 | if (genpd->power_off) { |
ba2bbfbf UH |
423 | int ret; |
424 | ||
425 | if (atomic_read(&genpd->sd_count) > 0) | |
426 | return -EBUSY; | |
17b75eca | 427 | |
3c07cbc4 | 428 | /* |
5063ce15 | 429 | * If sd_count > 0 at this point, one of the subdomains hasn't |
86e12eac UH |
430 | * managed to call genpd_power_on() for the master yet after |
431 | * incrementing it. In that case genpd_power_on() will wait | |
3c07cbc4 | 432 | * for us to drop the lock, so we can call .power_off() and let |
86e12eac | 433 | * the genpd_power_on() restore power for us (this shouldn't |
3c07cbc4 RW |
434 | * happen very often). |
435 | */ | |
86e12eac | 436 | ret = _genpd_power_off(genpd, true); |
ba2bbfbf UH |
437 | if (ret) |
438 | return ret; | |
d2805402 | 439 | } |
f721889f | 440 | |
17b75eca | 441 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 442 | |
5063ce15 RW |
443 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
444 | genpd_sd_counter_dec(link->master); | |
445 | genpd_queue_power_off_work(link->master); | |
446 | } | |
f721889f | 447 | |
ba2bbfbf | 448 | return 0; |
f721889f RW |
449 | } |
450 | ||
451 | /** | |
452 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
453 | * @work: Work structure used for scheduling the execution of this function. | |
454 | */ | |
455 | static void genpd_power_off_work_fn(struct work_struct *work) | |
456 | { | |
457 | struct generic_pm_domain *genpd; | |
458 | ||
459 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
460 | ||
35241d12 | 461 | genpd_lock(genpd); |
86e12eac | 462 | genpd_power_off(genpd, true); |
35241d12 | 463 | genpd_unlock(genpd); |
f721889f RW |
464 | } |
465 | ||
54eeddbf UH |
466 | /** |
467 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
468 | * @dev: Device to handle. | |
469 | */ | |
470 | static int __genpd_runtime_suspend(struct device *dev) | |
471 | { | |
472 | int (*cb)(struct device *__dev); | |
473 | ||
474 | if (dev->type && dev->type->pm) | |
475 | cb = dev->type->pm->runtime_suspend; | |
476 | else if (dev->class && dev->class->pm) | |
477 | cb = dev->class->pm->runtime_suspend; | |
478 | else if (dev->bus && dev->bus->pm) | |
479 | cb = dev->bus->pm->runtime_suspend; | |
480 | else | |
481 | cb = NULL; | |
482 | ||
483 | if (!cb && dev->driver && dev->driver->pm) | |
484 | cb = dev->driver->pm->runtime_suspend; | |
485 | ||
486 | return cb ? cb(dev) : 0; | |
487 | } | |
488 | ||
489 | /** | |
490 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
491 | * @dev: Device to handle. | |
492 | */ | |
493 | static int __genpd_runtime_resume(struct device *dev) | |
494 | { | |
495 | int (*cb)(struct device *__dev); | |
496 | ||
497 | if (dev->type && dev->type->pm) | |
498 | cb = dev->type->pm->runtime_resume; | |
499 | else if (dev->class && dev->class->pm) | |
500 | cb = dev->class->pm->runtime_resume; | |
501 | else if (dev->bus && dev->bus->pm) | |
502 | cb = dev->bus->pm->runtime_resume; | |
503 | else | |
504 | cb = NULL; | |
505 | ||
506 | if (!cb && dev->driver && dev->driver->pm) | |
507 | cb = dev->driver->pm->runtime_resume; | |
508 | ||
509 | return cb ? cb(dev) : 0; | |
510 | } | |
511 | ||
f721889f | 512 | /** |
795bd2e7 | 513 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
514 | * @dev: Device to suspend. |
515 | * | |
516 | * Carry out a runtime suspend of a device under the assumption that its | |
517 | * pm_domain field points to the domain member of an object of type | |
518 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
519 | */ | |
795bd2e7 | 520 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
521 | { |
522 | struct generic_pm_domain *genpd; | |
9df3921e | 523 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 524 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 525 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
526 | ktime_t time_start; |
527 | s64 elapsed_ns; | |
d5e4cbfe | 528 | int ret; |
f721889f RW |
529 | |
530 | dev_dbg(dev, "%s()\n", __func__); | |
531 | ||
5248051b RW |
532 | genpd = dev_to_genpd(dev); |
533 | if (IS_ERR(genpd)) | |
f721889f RW |
534 | return -EINVAL; |
535 | ||
ffe12855 UH |
536 | /* |
537 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
538 | * callbacks for other purposes than runtime PM. In those scenarios | |
539 | * runtime PM is disabled. Under these circumstances, we shall skip | |
540 | * validating/measuring the PM QoS latency. | |
541 | */ | |
9df3921e UH |
542 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
543 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
544 | return -EBUSY; |
545 | ||
2b1d88cd | 546 | /* Measure suspend latency. */ |
d33d5a6c | 547 | time_start = 0; |
ffe12855 UH |
548 | if (runtime_pm) |
549 | time_start = ktime_get(); | |
2b1d88cd | 550 | |
54eeddbf | 551 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
552 | if (ret) |
553 | return ret; | |
17b75eca | 554 | |
2b1d88cd | 555 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 556 | if (ret) { |
54eeddbf | 557 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
558 | return ret; |
559 | } | |
560 | ||
2b1d88cd | 561 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
562 | if (runtime_pm) { |
563 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
564 | if (elapsed_ns > td->suspend_latency_ns) { | |
565 | td->suspend_latency_ns = elapsed_ns; | |
566 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
567 | elapsed_ns); | |
568 | genpd->max_off_time_changed = true; | |
569 | td->constraint_changed = true; | |
570 | } | |
2b1d88cd UH |
571 | } |
572 | ||
0aa2a221 | 573 | /* |
d716f479 LI |
574 | * If power.irq_safe is set, this routine may be run with |
575 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 576 | */ |
d716f479 | 577 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
578 | return 0; |
579 | ||
35241d12 | 580 | genpd_lock(genpd); |
86e12eac | 581 | genpd_power_off(genpd, false); |
35241d12 | 582 | genpd_unlock(genpd); |
f721889f RW |
583 | |
584 | return 0; | |
585 | } | |
586 | ||
f721889f | 587 | /** |
795bd2e7 | 588 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
589 | * @dev: Device to resume. |
590 | * | |
591 | * Carry out a runtime resume of a device under the assumption that its | |
592 | * pm_domain field points to the domain member of an object of type | |
593 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
594 | */ | |
795bd2e7 | 595 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
596 | { |
597 | struct generic_pm_domain *genpd; | |
2b1d88cd | 598 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 599 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
600 | ktime_t time_start; |
601 | s64 elapsed_ns; | |
f721889f | 602 | int ret; |
ba2bbfbf | 603 | bool timed = true; |
f721889f RW |
604 | |
605 | dev_dbg(dev, "%s()\n", __func__); | |
606 | ||
5248051b RW |
607 | genpd = dev_to_genpd(dev); |
608 | if (IS_ERR(genpd)) | |
f721889f RW |
609 | return -EINVAL; |
610 | ||
d716f479 LI |
611 | /* |
612 | * As we don't power off a non IRQ safe domain, which holds | |
613 | * an IRQ safe device, we don't need to restore power to it. | |
614 | */ | |
615 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
616 | timed = false; |
617 | goto out; | |
618 | } | |
0aa2a221 | 619 | |
35241d12 | 620 | genpd_lock(genpd); |
86e12eac | 621 | ret = genpd_power_on(genpd, 0); |
35241d12 | 622 | genpd_unlock(genpd); |
c6d22b37 | 623 | |
ba2bbfbf UH |
624 | if (ret) |
625 | return ret; | |
c6d22b37 | 626 | |
ba2bbfbf | 627 | out: |
2b1d88cd | 628 | /* Measure resume latency. */ |
ab51e6ba | 629 | time_start = 0; |
ffe12855 | 630 | if (timed && runtime_pm) |
2b1d88cd UH |
631 | time_start = ktime_get(); |
632 | ||
076395ca LP |
633 | ret = genpd_start_dev(genpd, dev); |
634 | if (ret) | |
635 | goto err_poweroff; | |
636 | ||
54eeddbf | 637 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
638 | if (ret) |
639 | goto err_stop; | |
2b1d88cd UH |
640 | |
641 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 642 | if (timed && runtime_pm) { |
2b1d88cd UH |
643 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
644 | if (elapsed_ns > td->resume_latency_ns) { | |
645 | td->resume_latency_ns = elapsed_ns; | |
646 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
647 | elapsed_ns); | |
648 | genpd->max_off_time_changed = true; | |
649 | td->constraint_changed = true; | |
650 | } | |
651 | } | |
17b75eca | 652 | |
f721889f | 653 | return 0; |
076395ca LP |
654 | |
655 | err_stop: | |
656 | genpd_stop_dev(genpd, dev); | |
657 | err_poweroff: | |
d716f479 LI |
658 | if (!pm_runtime_is_irq_safe(dev) || |
659 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 660 | genpd_lock(genpd); |
86e12eac | 661 | genpd_power_off(genpd, 0); |
35241d12 | 662 | genpd_unlock(genpd); |
076395ca LP |
663 | } |
664 | ||
665 | return ret; | |
f721889f RW |
666 | } |
667 | ||
39ac5ba5 TB |
668 | static bool pd_ignore_unused; |
669 | static int __init pd_ignore_unused_setup(char *__unused) | |
670 | { | |
671 | pd_ignore_unused = true; | |
672 | return 1; | |
673 | } | |
674 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
675 | ||
17f2ae7f | 676 | /** |
86e12eac | 677 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 678 | */ |
86e12eac | 679 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
680 | { |
681 | struct generic_pm_domain *genpd; | |
682 | ||
39ac5ba5 TB |
683 | if (pd_ignore_unused) { |
684 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 685 | return 0; |
39ac5ba5 TB |
686 | } |
687 | ||
17f2ae7f RW |
688 | mutex_lock(&gpd_list_lock); |
689 | ||
690 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
691 | genpd_queue_power_off_work(genpd); | |
692 | ||
693 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 694 | |
2fe71dcd UH |
695 | return 0; |
696 | } | |
86e12eac | 697 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 698 | |
0159ec67 | 699 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 700 | |
77f827de RW |
701 | /** |
702 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
703 | * @genpd: PM domain to check. | |
704 | */ | |
895b31f3 | 705 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 706 | { |
895b31f3 | 707 | const struct generic_pm_domain *gpd; |
77f827de RW |
708 | |
709 | if (IS_ERR_OR_NULL(genpd)) | |
710 | return false; | |
711 | ||
712 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
713 | if (gpd == genpd) | |
714 | return true; | |
715 | ||
716 | return false; | |
717 | } | |
718 | ||
0159ec67 JH |
719 | #endif |
720 | ||
721 | #ifdef CONFIG_PM_SLEEP | |
722 | ||
d5e4cbfe RW |
723 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
724 | struct device *dev) | |
725 | { | |
726 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
727 | } | |
728 | ||
596ba34b | 729 | /** |
86e12eac | 730 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b RW |
731 | * @genpd: PM domain to power off, if possible. |
732 | * | |
733 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 734 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 735 | * |
77f827de RW |
736 | * This function is only called in "noirq" and "syscore" stages of system power |
737 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
738 | * executed sequentially, so it is guaranteed that it will never run twice in | |
739 | * parallel). | |
596ba34b | 740 | */ |
86e12eac | 741 | static void genpd_sync_power_off(struct generic_pm_domain *genpd) |
596ba34b | 742 | { |
5063ce15 | 743 | struct gpd_link *link; |
596ba34b | 744 | |
17b75eca | 745 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
746 | return; |
747 | ||
c4bb3160 RW |
748 | if (genpd->suspended_count != genpd->device_count |
749 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
750 | return; |
751 | ||
fc5cbf0c AH |
752 | /* Choose the deepest state when suspending */ |
753 | genpd->state_idx = genpd->state_count - 1; | |
86e12eac | 754 | _genpd_power_off(genpd, false); |
596ba34b | 755 | |
17b75eca | 756 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
757 | |
758 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
759 | genpd_sd_counter_dec(link->master); | |
86e12eac | 760 | genpd_sync_power_off(link->master); |
596ba34b RW |
761 | } |
762 | } | |
763 | ||
802d8b49 | 764 | /** |
86e12eac | 765 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 RW |
766 | * @genpd: PM domain to power on. |
767 | * | |
77f827de RW |
768 | * This function is only called in "noirq" and "syscore" stages of system power |
769 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
770 | * executed sequentially, so it is guaranteed that it will never run twice in | |
771 | * parallel). | |
802d8b49 | 772 | */ |
86e12eac | 773 | static void genpd_sync_power_on(struct generic_pm_domain *genpd) |
802d8b49 RW |
774 | { |
775 | struct gpd_link *link; | |
776 | ||
ba2bbfbf | 777 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
778 | return; |
779 | ||
780 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
86e12eac | 781 | genpd_sync_power_on(link->master); |
802d8b49 RW |
782 | genpd_sd_counter_inc(link->master); |
783 | } | |
784 | ||
86e12eac | 785 | _genpd_power_on(genpd, false); |
802d8b49 RW |
786 | |
787 | genpd->status = GPD_STATE_ACTIVE; | |
788 | } | |
789 | ||
4ecd6e65 RW |
790 | /** |
791 | * resume_needed - Check whether to resume a device before system suspend. | |
792 | * @dev: Device to check. | |
793 | * @genpd: PM domain the device belongs to. | |
794 | * | |
795 | * There are two cases in which a device that can wake up the system from sleep | |
796 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
797 | * to wake up the system and it has to remain active for this purpose while the | |
798 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
799 | * the system from sleep states and it generally doesn't generate wakeup signals | |
800 | * by itself (those signals are generated on its behalf by other parts of the | |
801 | * system). In the latter case it may be necessary to reconfigure the device's | |
802 | * wakeup settings during system suspend, because it may have been set up to | |
803 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
804 | * Return 'true' in either of the above cases. | |
805 | */ | |
806 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
807 | { | |
808 | bool active_wakeup; | |
809 | ||
810 | if (!device_can_wakeup(dev)) | |
811 | return false; | |
812 | ||
d5e4cbfe | 813 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
814 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
815 | } | |
816 | ||
596ba34b RW |
817 | /** |
818 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
819 | * @dev: Device to start the transition of. | |
820 | * | |
821 | * Start a power transition of a device (during a system-wide power transition) | |
822 | * under the assumption that its pm_domain field points to the domain member of | |
823 | * an object of type struct generic_pm_domain representing a PM domain | |
824 | * consisting of I/O devices. | |
825 | */ | |
826 | static int pm_genpd_prepare(struct device *dev) | |
827 | { | |
828 | struct generic_pm_domain *genpd; | |
b6c10c84 | 829 | int ret; |
596ba34b RW |
830 | |
831 | dev_dbg(dev, "%s()\n", __func__); | |
832 | ||
833 | genpd = dev_to_genpd(dev); | |
834 | if (IS_ERR(genpd)) | |
835 | return -EINVAL; | |
836 | ||
17b75eca RW |
837 | /* |
838 | * If a wakeup request is pending for the device, it should be woken up | |
839 | * at this point and a system wakeup event should be reported if it's | |
840 | * set up to wake up the system from sleep states. | |
841 | */ | |
4ecd6e65 RW |
842 | if (resume_needed(dev, genpd)) |
843 | pm_runtime_resume(dev); | |
844 | ||
35241d12 | 845 | genpd_lock(genpd); |
596ba34b | 846 | |
39dd0f23 | 847 | if (genpd->prepared_count++ == 0) |
65533bbf | 848 | genpd->suspended_count = 0; |
17b75eca | 849 | |
35241d12 | 850 | genpd_unlock(genpd); |
596ba34b | 851 | |
b6c10c84 RW |
852 | ret = pm_generic_prepare(dev); |
853 | if (ret) { | |
35241d12 | 854 | genpd_lock(genpd); |
b6c10c84 | 855 | |
39dd0f23 | 856 | genpd->prepared_count--; |
b6c10c84 | 857 | |
35241d12 | 858 | genpd_unlock(genpd); |
b6c10c84 | 859 | } |
17b75eca | 860 | |
b6c10c84 | 861 | return ret; |
596ba34b RW |
862 | } |
863 | ||
0496c8ae RW |
864 | /** |
865 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
866 | * @dev: Device to suspend. | |
867 | * | |
868 | * Stop the device and remove power from the domain if all devices in it have | |
869 | * been stopped. | |
870 | */ | |
871 | static int pm_genpd_suspend_noirq(struct device *dev) | |
872 | { | |
873 | struct generic_pm_domain *genpd; | |
122a2237 | 874 | int ret; |
0496c8ae RW |
875 | |
876 | dev_dbg(dev, "%s()\n", __func__); | |
877 | ||
878 | genpd = dev_to_genpd(dev); | |
879 | if (IS_ERR(genpd)) | |
880 | return -EINVAL; | |
596ba34b | 881 | |
39dd0f23 | 882 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
883 | return 0; |
884 | ||
122a2237 UH |
885 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
886 | ret = pm_runtime_force_suspend(dev); | |
887 | if (ret) | |
888 | return ret; | |
889 | } | |
890 | ||
596ba34b RW |
891 | /* |
892 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
893 | * guaranteed that this function will never run twice in parallel for | |
894 | * the same PM domain, so it is not necessary to use locking here. | |
895 | */ | |
896 | genpd->suspended_count++; | |
86e12eac | 897 | genpd_sync_power_off(genpd); |
596ba34b RW |
898 | |
899 | return 0; | |
900 | } | |
901 | ||
902 | /** | |
0496c8ae | 903 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
904 | * @dev: Device to resume. |
905 | * | |
0496c8ae | 906 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
907 | */ |
908 | static int pm_genpd_resume_noirq(struct device *dev) | |
909 | { | |
910 | struct generic_pm_domain *genpd; | |
122a2237 | 911 | int ret = 0; |
596ba34b RW |
912 | |
913 | dev_dbg(dev, "%s()\n", __func__); | |
914 | ||
915 | genpd = dev_to_genpd(dev); | |
916 | if (IS_ERR(genpd)) | |
917 | return -EINVAL; | |
918 | ||
39dd0f23 | 919 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
920 | return 0; |
921 | ||
922 | /* | |
923 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
924 | * guaranteed that this function will never run twice in parallel for | |
925 | * the same PM domain, so it is not necessary to use locking here. | |
926 | */ | |
86e12eac | 927 | genpd_sync_power_on(genpd); |
596ba34b | 928 | genpd->suspended_count--; |
596ba34b | 929 | |
122a2237 UH |
930 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
931 | ret = pm_runtime_force_resume(dev); | |
932 | ||
933 | return ret; | |
596ba34b RW |
934 | } |
935 | ||
0496c8ae RW |
936 | /** |
937 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
938 | * @dev: Device to freeze. |
939 | * | |
940 | * Carry out a late freeze of a device under the assumption that its | |
941 | * pm_domain field points to the domain member of an object of type | |
942 | * struct generic_pm_domain representing a power domain consisting of I/O | |
943 | * devices. | |
944 | */ | |
945 | static int pm_genpd_freeze_noirq(struct device *dev) | |
946 | { | |
947 | struct generic_pm_domain *genpd; | |
122a2237 | 948 | int ret = 0; |
596ba34b RW |
949 | |
950 | dev_dbg(dev, "%s()\n", __func__); | |
951 | ||
952 | genpd = dev_to_genpd(dev); | |
953 | if (IS_ERR(genpd)) | |
954 | return -EINVAL; | |
955 | ||
122a2237 UH |
956 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
957 | ret = pm_runtime_force_suspend(dev); | |
958 | ||
959 | return ret; | |
0496c8ae | 960 | } |
596ba34b | 961 | |
0496c8ae RW |
962 | /** |
963 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
964 | * @dev: Device to thaw. | |
965 | * | |
966 | * Start the device, unless power has been removed from the domain already | |
967 | * before the system transition. | |
968 | */ | |
969 | static int pm_genpd_thaw_noirq(struct device *dev) | |
970 | { | |
971 | struct generic_pm_domain *genpd; | |
122a2237 | 972 | int ret = 0; |
596ba34b | 973 | |
0496c8ae | 974 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 975 | |
0496c8ae RW |
976 | genpd = dev_to_genpd(dev); |
977 | if (IS_ERR(genpd)) | |
978 | return -EINVAL; | |
979 | ||
122a2237 UH |
980 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
981 | ret = pm_runtime_force_resume(dev); | |
982 | ||
983 | return ret; | |
596ba34b RW |
984 | } |
985 | ||
596ba34b | 986 | /** |
0496c8ae | 987 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
988 | * @dev: Device to resume. |
989 | * | |
0496c8ae RW |
990 | * Make sure the domain will be in the same power state as before the |
991 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
992 | */ |
993 | static int pm_genpd_restore_noirq(struct device *dev) | |
994 | { | |
995 | struct generic_pm_domain *genpd; | |
122a2237 | 996 | int ret = 0; |
596ba34b RW |
997 | |
998 | dev_dbg(dev, "%s()\n", __func__); | |
999 | ||
1000 | genpd = dev_to_genpd(dev); | |
1001 | if (IS_ERR(genpd)) | |
1002 | return -EINVAL; | |
1003 | ||
1004 | /* | |
1005 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1006 | * guaranteed that this function will never run twice in parallel for | |
1007 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1008 | * |
1009 | * At this point suspended_count == 0 means we are being run for the | |
1010 | * first time for the given domain in the present cycle. | |
596ba34b | 1011 | */ |
39dd0f23 | 1012 | if (genpd->suspended_count++ == 0) |
596ba34b | 1013 | /* |
65533bbf | 1014 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1015 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1016 | * so that it tries to power it on in case it was really off. |
596ba34b | 1017 | */ |
65533bbf | 1018 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1019 | |
86e12eac | 1020 | genpd_sync_power_on(genpd); |
596ba34b | 1021 | |
122a2237 UH |
1022 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1023 | ret = pm_runtime_force_resume(dev); | |
1024 | ||
1025 | return ret; | |
596ba34b RW |
1026 | } |
1027 | ||
1028 | /** | |
1029 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1030 | * @dev: Device to complete the transition of. | |
1031 | * | |
1032 | * Complete a power transition of a device (during a system-wide power | |
1033 | * transition) under the assumption that its pm_domain field points to the | |
1034 | * domain member of an object of type struct generic_pm_domain representing | |
1035 | * a power domain consisting of I/O devices. | |
1036 | */ | |
1037 | static void pm_genpd_complete(struct device *dev) | |
1038 | { | |
1039 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1040 | |
1041 | dev_dbg(dev, "%s()\n", __func__); | |
1042 | ||
1043 | genpd = dev_to_genpd(dev); | |
1044 | if (IS_ERR(genpd)) | |
1045 | return; | |
1046 | ||
4d23a5e8 UH |
1047 | pm_generic_complete(dev); |
1048 | ||
35241d12 | 1049 | genpd_lock(genpd); |
596ba34b | 1050 | |
39dd0f23 | 1051 | genpd->prepared_count--; |
4d23a5e8 UH |
1052 | if (!genpd->prepared_count) |
1053 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1054 | |
35241d12 | 1055 | genpd_unlock(genpd); |
596ba34b RW |
1056 | } |
1057 | ||
77f827de | 1058 | /** |
d47e6464 | 1059 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1060 | * @dev: Device that normally is marked as "always on" to switch power for. |
1061 | * | |
1062 | * This routine may only be called during the system core (syscore) suspend or | |
1063 | * resume phase for devices whose "always on" flags are set. | |
1064 | */ | |
d47e6464 | 1065 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1066 | { |
1067 | struct generic_pm_domain *genpd; | |
1068 | ||
1069 | genpd = dev_to_genpd(dev); | |
1070 | if (!pm_genpd_present(genpd)) | |
1071 | return; | |
1072 | ||
1073 | if (suspend) { | |
1074 | genpd->suspended_count++; | |
86e12eac | 1075 | genpd_sync_power_off(genpd); |
77f827de | 1076 | } else { |
86e12eac | 1077 | genpd_sync_power_on(genpd); |
77f827de RW |
1078 | genpd->suspended_count--; |
1079 | } | |
1080 | } | |
d47e6464 UH |
1081 | |
1082 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1083 | { | |
1084 | genpd_syscore_switch(dev, true); | |
1085 | } | |
1086 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1087 | ||
1088 | void pm_genpd_syscore_poweron(struct device *dev) | |
1089 | { | |
1090 | genpd_syscore_switch(dev, false); | |
1091 | } | |
1092 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1093 | |
d30d819d | 1094 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1095 | |
1096 | #define pm_genpd_prepare NULL | |
596ba34b RW |
1097 | #define pm_genpd_suspend_noirq NULL |
1098 | #define pm_genpd_resume_noirq NULL | |
596ba34b RW |
1099 | #define pm_genpd_freeze_noirq NULL |
1100 | #define pm_genpd_thaw_noirq NULL | |
596ba34b | 1101 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1102 | #define pm_genpd_complete NULL |
1103 | ||
1104 | #endif /* CONFIG_PM_SLEEP */ | |
1105 | ||
f104e1e5 UH |
1106 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1107 | struct generic_pm_domain *genpd, | |
1108 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1109 | { |
1110 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1111 | int ret; |
1112 | ||
1113 | ret = dev_pm_get_subsys_data(dev); | |
1114 | if (ret) | |
1115 | return ERR_PTR(ret); | |
1d5fcfec RW |
1116 | |
1117 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1118 | if (!gpd_data) { |
1119 | ret = -ENOMEM; | |
1120 | goto err_put; | |
1121 | } | |
1d5fcfec | 1122 | |
f104e1e5 UH |
1123 | if (td) |
1124 | gpd_data->td = *td; | |
1125 | ||
1126 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1127 | gpd_data->td.constraint_changed = true; |
1128 | gpd_data->td.effective_constraint_ns = -1; | |
1129 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1130 | ||
1131 | spin_lock_irq(&dev->power.lock); | |
1132 | ||
1133 | if (dev->power.subsys_data->domain_data) { | |
1134 | ret = -EINVAL; | |
1135 | goto err_free; | |
1136 | } | |
1137 | ||
1138 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1139 | |
1140 | spin_unlock_irq(&dev->power.lock); | |
1141 | ||
989561de TV |
1142 | dev_pm_domain_set(dev, &genpd->domain); |
1143 | ||
1d5fcfec | 1144 | return gpd_data; |
3e235685 | 1145 | |
f104e1e5 UH |
1146 | err_free: |
1147 | spin_unlock_irq(&dev->power.lock); | |
1148 | kfree(gpd_data); | |
3e235685 UH |
1149 | err_put: |
1150 | dev_pm_put_subsys_data(dev); | |
1151 | return ERR_PTR(ret); | |
1d5fcfec RW |
1152 | } |
1153 | ||
49d400c7 UH |
1154 | static void genpd_free_dev_data(struct device *dev, |
1155 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1156 | { |
989561de TV |
1157 | dev_pm_domain_set(dev, NULL); |
1158 | ||
f104e1e5 UH |
1159 | spin_lock_irq(&dev->power.lock); |
1160 | ||
f104e1e5 UH |
1161 | dev->power.subsys_data->domain_data = NULL; |
1162 | ||
1163 | spin_unlock_irq(&dev->power.lock); | |
1164 | ||
1d5fcfec | 1165 | kfree(gpd_data); |
3e235685 | 1166 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1167 | } |
1168 | ||
19efa5ff JH |
1169 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1170 | struct gpd_timing_data *td) | |
f721889f | 1171 | { |
c0356db7 | 1172 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1173 | int ret = 0; |
1174 | ||
1175 | dev_dbg(dev, "%s()\n", __func__); | |
1176 | ||
1177 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1178 | return -EINVAL; | |
1179 | ||
f104e1e5 | 1180 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1181 | if (IS_ERR(gpd_data)) |
1182 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1183 | |
35241d12 | 1184 | genpd_lock(genpd); |
f721889f | 1185 | |
596ba34b RW |
1186 | if (genpd->prepared_count > 0) { |
1187 | ret = -EAGAIN; | |
1188 | goto out; | |
1189 | } | |
1190 | ||
b472c2fa UH |
1191 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1192 | if (ret) | |
1193 | goto out; | |
d79b6fe1 | 1194 | |
14b53064 UH |
1195 | genpd->device_count++; |
1196 | genpd->max_off_time_changed = true; | |
1197 | ||
1d5fcfec | 1198 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1199 | |
f721889f | 1200 | out: |
35241d12 | 1201 | genpd_unlock(genpd); |
f721889f | 1202 | |
c0356db7 UH |
1203 | if (ret) |
1204 | genpd_free_dev_data(dev, gpd_data); | |
1205 | else | |
1206 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1207 | |
f721889f RW |
1208 | return ret; |
1209 | } | |
19efa5ff JH |
1210 | |
1211 | /** | |
1212 | * __pm_genpd_add_device - Add a device to an I/O PM domain. | |
1213 | * @genpd: PM domain to add the device to. | |
1214 | * @dev: Device to be added. | |
1215 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1216 | */ | |
1217 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, | |
1218 | struct gpd_timing_data *td) | |
1219 | { | |
1220 | int ret; | |
1221 | ||
1222 | mutex_lock(&gpd_list_lock); | |
1223 | ret = genpd_add_device(genpd, dev, td); | |
1224 | mutex_unlock(&gpd_list_lock); | |
1225 | ||
1226 | return ret; | |
1227 | } | |
24c96dc7 | 1228 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f | 1229 | |
85168d56 UH |
1230 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1231 | struct device *dev) | |
f721889f | 1232 | { |
6ff7bb0d | 1233 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1234 | struct pm_domain_data *pdd; |
efa69025 | 1235 | int ret = 0; |
f721889f RW |
1236 | |
1237 | dev_dbg(dev, "%s()\n", __func__); | |
1238 | ||
c0356db7 UH |
1239 | pdd = dev->power.subsys_data->domain_data; |
1240 | gpd_data = to_gpd_data(pdd); | |
1241 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1242 | ||
35241d12 | 1243 | genpd_lock(genpd); |
f721889f | 1244 | |
596ba34b RW |
1245 | if (genpd->prepared_count > 0) { |
1246 | ret = -EAGAIN; | |
1247 | goto out; | |
1248 | } | |
1249 | ||
6ff7bb0d RW |
1250 | genpd->device_count--; |
1251 | genpd->max_off_time_changed = true; | |
1252 | ||
d79b6fe1 | 1253 | if (genpd->detach_dev) |
c16561e8 | 1254 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1255 | |
efa69025 | 1256 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1257 | |
35241d12 | 1258 | genpd_unlock(genpd); |
6ff7bb0d | 1259 | |
c1dbe2fb | 1260 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1261 | |
6ff7bb0d | 1262 | return 0; |
f721889f | 1263 | |
596ba34b | 1264 | out: |
35241d12 | 1265 | genpd_unlock(genpd); |
c0356db7 | 1266 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1267 | |
1268 | return ret; | |
1269 | } | |
85168d56 UH |
1270 | |
1271 | /** | |
1272 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1273 | * @genpd: PM domain to remove the device from. | |
1274 | * @dev: Device to be removed. | |
1275 | */ | |
1276 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1277 | struct device *dev) | |
1278 | { | |
1279 | if (!genpd || genpd != genpd_lookup_dev(dev)) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | return genpd_remove_device(genpd, dev); | |
1283 | } | |
24c96dc7 | 1284 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1285 | |
19efa5ff JH |
1286 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1287 | struct generic_pm_domain *subdomain) | |
f721889f | 1288 | { |
2547923d | 1289 | struct gpd_link *link, *itr; |
f721889f RW |
1290 | int ret = 0; |
1291 | ||
fb7268be RW |
1292 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1293 | || genpd == subdomain) | |
f721889f RW |
1294 | return -EINVAL; |
1295 | ||
d716f479 LI |
1296 | /* |
1297 | * If the domain can be powered on/off in an IRQ safe | |
1298 | * context, ensure that the subdomain can also be | |
1299 | * powered on/off in that context. | |
1300 | */ | |
1301 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1302 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1303 | genpd->name, subdomain->name); |
1304 | return -EINVAL; | |
1305 | } | |
1306 | ||
2547923d LI |
1307 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1308 | if (!link) | |
1309 | return -ENOMEM; | |
1310 | ||
35241d12 LI |
1311 | genpd_lock(subdomain); |
1312 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1313 | |
17b75eca | 1314 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1315 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1316 | ret = -EINVAL; |
1317 | goto out; | |
1318 | } | |
1319 | ||
2547923d LI |
1320 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1321 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1322 | ret = -EINVAL; |
1323 | goto out; | |
1324 | } | |
1325 | } | |
1326 | ||
5063ce15 RW |
1327 | link->master = genpd; |
1328 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1329 | link->slave = subdomain; |
1330 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1331 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1332 | genpd_sd_counter_inc(genpd); |
f721889f | 1333 | |
f721889f | 1334 | out: |
35241d12 LI |
1335 | genpd_unlock(genpd); |
1336 | genpd_unlock(subdomain); | |
2547923d LI |
1337 | if (ret) |
1338 | kfree(link); | |
f721889f RW |
1339 | return ret; |
1340 | } | |
19efa5ff JH |
1341 | |
1342 | /** | |
1343 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1344 | * @genpd: Master PM domain to add the subdomain to. | |
1345 | * @subdomain: Subdomain to be added. | |
1346 | */ | |
1347 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1348 | struct generic_pm_domain *subdomain) | |
1349 | { | |
1350 | int ret; | |
1351 | ||
1352 | mutex_lock(&gpd_list_lock); | |
1353 | ret = genpd_add_subdomain(genpd, subdomain); | |
1354 | mutex_unlock(&gpd_list_lock); | |
1355 | ||
1356 | return ret; | |
1357 | } | |
d60ee966 | 1358 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1359 | |
1360 | /** | |
1361 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1362 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1363 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1364 | */ |
1365 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1366 | struct generic_pm_domain *subdomain) |
f721889f | 1367 | { |
5063ce15 | 1368 | struct gpd_link *link; |
f721889f RW |
1369 | int ret = -EINVAL; |
1370 | ||
5063ce15 | 1371 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1372 | return -EINVAL; |
1373 | ||
35241d12 LI |
1374 | genpd_lock(subdomain); |
1375 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1376 | |
beda5fc1 | 1377 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1378 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1379 | subdomain->name); | |
1380 | ret = -EBUSY; | |
1381 | goto out; | |
1382 | } | |
1383 | ||
5063ce15 RW |
1384 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1385 | if (link->slave != subdomain) | |
f721889f RW |
1386 | continue; |
1387 | ||
5063ce15 RW |
1388 | list_del(&link->master_node); |
1389 | list_del(&link->slave_node); | |
1390 | kfree(link); | |
17b75eca | 1391 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1392 | genpd_sd_counter_dec(genpd); |
1393 | ||
f721889f RW |
1394 | ret = 0; |
1395 | break; | |
1396 | } | |
1397 | ||
30e7a65b | 1398 | out: |
35241d12 LI |
1399 | genpd_unlock(genpd); |
1400 | genpd_unlock(subdomain); | |
f721889f RW |
1401 | |
1402 | return ret; | |
1403 | } | |
d60ee966 | 1404 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1405 | |
59d65b73 LI |
1406 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1407 | { | |
1408 | struct genpd_power_state *state; | |
1409 | ||
1410 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1411 | if (!state) | |
1412 | return -ENOMEM; | |
1413 | ||
1414 | genpd->states = state; | |
1415 | genpd->state_count = 1; | |
1416 | genpd->free = state; | |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
d716f479 LI |
1421 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1422 | { | |
1423 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1424 | spin_lock_init(&genpd->slock); | |
1425 | genpd->lock_ops = &genpd_spin_ops; | |
1426 | } else { | |
1427 | mutex_init(&genpd->mlock); | |
1428 | genpd->lock_ops = &genpd_mtx_ops; | |
1429 | } | |
1430 | } | |
1431 | ||
f721889f RW |
1432 | /** |
1433 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1434 | * @genpd: PM domain object to initialize. | |
1435 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1436 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1437 | * |
1438 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1439 | */ |
7eb231c3 UH |
1440 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1441 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1442 | { |
59d65b73 LI |
1443 | int ret; |
1444 | ||
f721889f | 1445 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1446 | return -EINVAL; |
f721889f | 1447 | |
5063ce15 RW |
1448 | INIT_LIST_HEAD(&genpd->master_links); |
1449 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1450 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1451 | genpd_lock_init(genpd); |
f721889f RW |
1452 | genpd->gov = gov; |
1453 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1454 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1455 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1456 | genpd->device_count = 0; |
221e9b58 | 1457 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1458 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1459 | genpd->provider = NULL; |
1460 | genpd->has_provider = false; | |
795bd2e7 UH |
1461 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1462 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
596ba34b | 1463 | genpd->domain.ops.prepare = pm_genpd_prepare; |
596ba34b RW |
1464 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1465 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
596ba34b RW |
1466 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1467 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
d23b9b00 | 1468 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1469 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
596ba34b | 1470 | genpd->domain.ops.complete = pm_genpd_complete; |
c11f6f5b UH |
1471 | |
1472 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1473 | genpd->dev_ops.stop = pm_clk_suspend; | |
1474 | genpd->dev_ops.start = pm_clk_resume; | |
1475 | } | |
1476 | ||
fc5cbf0c | 1477 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1478 | if (genpd->state_count == 0) { |
1479 | ret = genpd_set_default_power_state(genpd); | |
1480 | if (ret) | |
1481 | return ret; | |
1482 | } | |
fc5cbf0c | 1483 | |
5125bbf3 RW |
1484 | mutex_lock(&gpd_list_lock); |
1485 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1486 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1487 | |
1488 | return 0; | |
5125bbf3 | 1489 | } |
be5ed55d | 1490 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1491 | |
3fe57710 JH |
1492 | static int genpd_remove(struct generic_pm_domain *genpd) |
1493 | { | |
1494 | struct gpd_link *l, *link; | |
1495 | ||
1496 | if (IS_ERR_OR_NULL(genpd)) | |
1497 | return -EINVAL; | |
1498 | ||
35241d12 | 1499 | genpd_lock(genpd); |
3fe57710 JH |
1500 | |
1501 | if (genpd->has_provider) { | |
35241d12 | 1502 | genpd_unlock(genpd); |
3fe57710 JH |
1503 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1504 | return -EBUSY; | |
1505 | } | |
1506 | ||
1507 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1508 | genpd_unlock(genpd); |
3fe57710 JH |
1509 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1510 | return -EBUSY; | |
1511 | } | |
1512 | ||
1513 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1514 | list_del(&link->master_node); | |
1515 | list_del(&link->slave_node); | |
1516 | kfree(link); | |
1517 | } | |
1518 | ||
1519 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1520 | genpd_unlock(genpd); |
3fe57710 | 1521 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1522 | kfree(genpd->free); |
3fe57710 JH |
1523 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1530 | * @genpd: Pointer to PM domain that is to be removed. | |
1531 | * | |
1532 | * To remove the PM domain, this function: | |
1533 | * - Removes the PM domain as a subdomain to any parent domains, | |
1534 | * if it was added. | |
1535 | * - Removes the PM domain from the list of registered PM domains. | |
1536 | * | |
1537 | * The PM domain will only be removed, if the associated provider has | |
1538 | * been removed, it is not a parent to any other PM domain and has no | |
1539 | * devices associated with it. | |
1540 | */ | |
1541 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1542 | { | |
1543 | int ret; | |
1544 | ||
1545 | mutex_lock(&gpd_list_lock); | |
1546 | ret = genpd_remove(genpd); | |
1547 | mutex_unlock(&gpd_list_lock); | |
1548 | ||
1549 | return ret; | |
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1552 | ||
aa42240a | 1553 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc JH |
1554 | |
1555 | typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, | |
1556 | void *data); | |
1557 | ||
aa42240a TF |
1558 | /* |
1559 | * Device Tree based PM domain providers. | |
1560 | * | |
1561 | * The code below implements generic device tree based PM domain providers that | |
1562 | * bind device tree nodes with generic PM domains registered in the system. | |
1563 | * | |
1564 | * Any driver that registers generic PM domains and needs to support binding of | |
1565 | * devices to these domains is supposed to register a PM domain provider, which | |
1566 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1567 | * | |
1568 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1569 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1570 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1571 | * index. |
1572 | */ | |
1573 | ||
1574 | /** | |
1575 | * struct of_genpd_provider - PM domain provider registration structure | |
1576 | * @link: Entry in global list of PM domain providers | |
1577 | * @node: Pointer to device tree node of PM domain provider | |
1578 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1579 | * into a PM domain. | |
1580 | * @data: context pointer to be passed into @xlate callback | |
1581 | */ | |
1582 | struct of_genpd_provider { | |
1583 | struct list_head link; | |
1584 | struct device_node *node; | |
1585 | genpd_xlate_t xlate; | |
1586 | void *data; | |
1587 | }; | |
1588 | ||
1589 | /* List of registered PM domain providers. */ | |
1590 | static LIST_HEAD(of_genpd_providers); | |
1591 | /* Mutex to protect the list above. */ | |
1592 | static DEFINE_MUTEX(of_genpd_mutex); | |
1593 | ||
1594 | /** | |
892ebdcc | 1595 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1596 | * @genpdspec: OF phandle args to map into a PM domain |
1597 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1598 | * | |
1599 | * This is a generic xlate function that can be used to model PM domains that | |
1600 | * have their own device tree nodes. The private data of xlate function needs | |
1601 | * to be a valid pointer to struct generic_pm_domain. | |
1602 | */ | |
892ebdcc | 1603 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1604 | struct of_phandle_args *genpdspec, |
1605 | void *data) | |
1606 | { | |
1607 | if (genpdspec->args_count != 0) | |
1608 | return ERR_PTR(-EINVAL); | |
1609 | return data; | |
1610 | } | |
aa42240a TF |
1611 | |
1612 | /** | |
892ebdcc | 1613 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1614 | * @genpdspec: OF phandle args to map into a PM domain |
1615 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1616 | * | |
1617 | * This is a generic xlate function that can be used to model simple PM domain | |
1618 | * controllers that have one device tree node and provide multiple PM domains. | |
1619 | * A single cell is used as an index into an array of PM domains specified in | |
1620 | * the genpd_onecell_data struct when registering the provider. | |
1621 | */ | |
892ebdcc | 1622 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1623 | struct of_phandle_args *genpdspec, |
1624 | void *data) | |
1625 | { | |
1626 | struct genpd_onecell_data *genpd_data = data; | |
1627 | unsigned int idx = genpdspec->args[0]; | |
1628 | ||
1629 | if (genpdspec->args_count != 1) | |
1630 | return ERR_PTR(-EINVAL); | |
1631 | ||
1632 | if (idx >= genpd_data->num_domains) { | |
1633 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1634 | return ERR_PTR(-EINVAL); | |
1635 | } | |
1636 | ||
1637 | if (!genpd_data->domains[idx]) | |
1638 | return ERR_PTR(-ENOENT); | |
1639 | ||
1640 | return genpd_data->domains[idx]; | |
1641 | } | |
aa42240a TF |
1642 | |
1643 | /** | |
892ebdcc | 1644 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1645 | * @np: Device node pointer associated with the PM domain provider. |
1646 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1647 | * @data: Context pointer for @xlate callback. | |
1648 | */ | |
892ebdcc JH |
1649 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1650 | void *data) | |
aa42240a TF |
1651 | { |
1652 | struct of_genpd_provider *cp; | |
1653 | ||
1654 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1655 | if (!cp) | |
1656 | return -ENOMEM; | |
1657 | ||
1658 | cp->node = of_node_get(np); | |
1659 | cp->data = data; | |
1660 | cp->xlate = xlate; | |
1661 | ||
1662 | mutex_lock(&of_genpd_mutex); | |
1663 | list_add(&cp->link, &of_genpd_providers); | |
1664 | mutex_unlock(&of_genpd_mutex); | |
1665 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1666 | ||
1667 | return 0; | |
1668 | } | |
892ebdcc JH |
1669 | |
1670 | /** | |
1671 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1672 | * @np: Device node pointer associated with the PM domain provider. | |
1673 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1674 | */ | |
1675 | int of_genpd_add_provider_simple(struct device_node *np, | |
1676 | struct generic_pm_domain *genpd) | |
1677 | { | |
0159ec67 JH |
1678 | int ret = -EINVAL; |
1679 | ||
1680 | if (!np || !genpd) | |
1681 | return -EINVAL; | |
1682 | ||
1683 | mutex_lock(&gpd_list_lock); | |
1684 | ||
1685 | if (pm_genpd_present(genpd)) | |
1686 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); | |
1687 | ||
de0aa06d JH |
1688 | if (!ret) { |
1689 | genpd->provider = &np->fwnode; | |
1690 | genpd->has_provider = true; | |
1691 | } | |
1692 | ||
0159ec67 JH |
1693 | mutex_unlock(&gpd_list_lock); |
1694 | ||
1695 | return ret; | |
892ebdcc JH |
1696 | } |
1697 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1698 | ||
1699 | /** | |
1700 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1701 | * @np: Device node pointer associated with the PM domain provider. | |
1702 | * @data: Pointer to the data associated with the PM domain provider. | |
1703 | */ | |
1704 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1705 | struct genpd_onecell_data *data) | |
1706 | { | |
0159ec67 | 1707 | unsigned int i; |
de0aa06d | 1708 | int ret = -EINVAL; |
0159ec67 JH |
1709 | |
1710 | if (!np || !data) | |
1711 | return -EINVAL; | |
1712 | ||
1713 | mutex_lock(&gpd_list_lock); | |
1714 | ||
1715 | for (i = 0; i < data->num_domains; i++) { | |
609bed67 TV |
1716 | if (!data->domains[i]) |
1717 | continue; | |
de0aa06d JH |
1718 | if (!pm_genpd_present(data->domains[i])) |
1719 | goto error; | |
1720 | ||
1721 | data->domains[i]->provider = &np->fwnode; | |
1722 | data->domains[i]->has_provider = true; | |
0159ec67 JH |
1723 | } |
1724 | ||
1725 | ret = genpd_add_provider(np, genpd_xlate_onecell, data); | |
de0aa06d JH |
1726 | if (ret < 0) |
1727 | goto error; | |
1728 | ||
1729 | mutex_unlock(&gpd_list_lock); | |
1730 | ||
1731 | return 0; | |
1732 | ||
1733 | error: | |
1734 | while (i--) { | |
609bed67 TV |
1735 | if (!data->domains[i]) |
1736 | continue; | |
de0aa06d JH |
1737 | data->domains[i]->provider = NULL; |
1738 | data->domains[i]->has_provider = false; | |
1739 | } | |
0159ec67 JH |
1740 | |
1741 | mutex_unlock(&gpd_list_lock); | |
1742 | ||
1743 | return ret; | |
892ebdcc JH |
1744 | } |
1745 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1746 | |
1747 | /** | |
1748 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1749 | * @np: Device node pointer associated with the PM domain provider | |
1750 | */ | |
1751 | void of_genpd_del_provider(struct device_node *np) | |
1752 | { | |
1753 | struct of_genpd_provider *cp; | |
de0aa06d | 1754 | struct generic_pm_domain *gpd; |
aa42240a | 1755 | |
de0aa06d | 1756 | mutex_lock(&gpd_list_lock); |
aa42240a TF |
1757 | mutex_lock(&of_genpd_mutex); |
1758 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1759 | if (cp->node == np) { | |
de0aa06d JH |
1760 | /* |
1761 | * For each PM domain associated with the | |
1762 | * provider, set the 'has_provider' to false | |
1763 | * so that the PM domain can be safely removed. | |
1764 | */ | |
1765 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
1766 | if (gpd->provider == &np->fwnode) | |
1767 | gpd->has_provider = false; | |
1768 | ||
aa42240a TF |
1769 | list_del(&cp->link); |
1770 | of_node_put(cp->node); | |
1771 | kfree(cp); | |
1772 | break; | |
1773 | } | |
1774 | } | |
1775 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 1776 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
1777 | } |
1778 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1779 | ||
1780 | /** | |
f58d4e5a | 1781 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
1782 | * @genpdspec: OF phandle args to use for look-up |
1783 | * | |
1784 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1785 | * found, uses xlate function of the provider to map phandle args to a PM | |
1786 | * domain. | |
1787 | * | |
1788 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1789 | * on failure. | |
1790 | */ | |
f58d4e5a | 1791 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
1792 | struct of_phandle_args *genpdspec) |
1793 | { | |
1794 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1795 | struct of_genpd_provider *provider; | |
1796 | ||
41795a8a JH |
1797 | if (!genpdspec) |
1798 | return ERR_PTR(-EINVAL); | |
1799 | ||
aa42240a TF |
1800 | mutex_lock(&of_genpd_mutex); |
1801 | ||
1802 | /* Check if we have such a provider in our array */ | |
1803 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1804 | if (provider->node == genpdspec->np) | |
1805 | genpd = provider->xlate(genpdspec, provider->data); | |
1806 | if (!IS_ERR(genpd)) | |
1807 | break; | |
1808 | } | |
1809 | ||
1810 | mutex_unlock(&of_genpd_mutex); | |
1811 | ||
1812 | return genpd; | |
1813 | } | |
1814 | ||
ec69572b JH |
1815 | /** |
1816 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
1817 | * @genpdspec: OF phandle args to use for look-up PM domain | |
1818 | * @dev: Device to be added. | |
1819 | * | |
1820 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
1821 | * the device to the PM domain. Returns a negative error code on failure. | |
1822 | */ | |
1823 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
1824 | { | |
1825 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
1826 | int ret; |
1827 | ||
1828 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1829 | |
f58d4e5a | 1830 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
1831 | if (IS_ERR(genpd)) { |
1832 | ret = PTR_ERR(genpd); | |
1833 | goto out; | |
1834 | } | |
1835 | ||
1836 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 1837 | |
19efa5ff JH |
1838 | out: |
1839 | mutex_unlock(&gpd_list_lock); | |
1840 | ||
1841 | return ret; | |
ec69572b JH |
1842 | } |
1843 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
1844 | ||
1845 | /** | |
1846 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1847 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
1848 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
1849 | * | |
1850 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
1851 | * provided and adds the subdomain to the parent PM domain. Returns a | |
1852 | * negative error code on failure. | |
1853 | */ | |
1854 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
1855 | struct of_phandle_args *subdomain_spec) | |
1856 | { | |
1857 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
1858 | int ret; |
1859 | ||
1860 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1861 | |
f58d4e5a | 1862 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
1863 | if (IS_ERR(parent)) { |
1864 | ret = PTR_ERR(parent); | |
1865 | goto out; | |
1866 | } | |
ec69572b | 1867 | |
f58d4e5a | 1868 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
1869 | if (IS_ERR(subdomain)) { |
1870 | ret = PTR_ERR(subdomain); | |
1871 | goto out; | |
1872 | } | |
1873 | ||
1874 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 1875 | |
19efa5ff JH |
1876 | out: |
1877 | mutex_unlock(&gpd_list_lock); | |
1878 | ||
1879 | return ret; | |
ec69572b JH |
1880 | } |
1881 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
1882 | ||
17926551 JH |
1883 | /** |
1884 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
1885 | * @provider: Pointer to device structure associated with provider | |
1886 | * | |
1887 | * Find the last PM domain that was added by a particular provider and | |
1888 | * remove this PM domain from the list of PM domains. The provider is | |
1889 | * identified by the 'provider' device structure that is passed. The PM | |
1890 | * domain will only be removed, if the provider associated with domain | |
1891 | * has been removed. | |
1892 | * | |
1893 | * Returns a valid pointer to struct generic_pm_domain on success or | |
1894 | * ERR_PTR() on failure. | |
1895 | */ | |
1896 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
1897 | { | |
1898 | struct generic_pm_domain *gpd, *genpd = ERR_PTR(-ENOENT); | |
1899 | int ret; | |
1900 | ||
1901 | if (IS_ERR_OR_NULL(np)) | |
1902 | return ERR_PTR(-EINVAL); | |
1903 | ||
1904 | mutex_lock(&gpd_list_lock); | |
1905 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1906 | if (gpd->provider == &np->fwnode) { | |
1907 | ret = genpd_remove(gpd); | |
1908 | genpd = ret ? ERR_PTR(ret) : gpd; | |
1909 | break; | |
1910 | } | |
1911 | } | |
1912 | mutex_unlock(&gpd_list_lock); | |
1913 | ||
1914 | return genpd; | |
1915 | } | |
1916 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
1917 | ||
aa42240a TF |
1918 | /** |
1919 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1920 | * @dev: Device to detach. |
aa42240a TF |
1921 | * @power_off: Currently not used |
1922 | * | |
1923 | * Try to locate a corresponding generic PM domain, which the device was | |
1924 | * attached to previously. If such is found, the device is detached from it. | |
1925 | */ | |
1926 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1927 | { | |
446d999c | 1928 | struct generic_pm_domain *pd; |
93af5e93 | 1929 | unsigned int i; |
aa42240a TF |
1930 | int ret = 0; |
1931 | ||
85168d56 UH |
1932 | pd = dev_to_genpd(dev); |
1933 | if (IS_ERR(pd)) | |
aa42240a TF |
1934 | return; |
1935 | ||
1936 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1937 | ||
93af5e93 | 1938 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 1939 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
1940 | if (ret != -EAGAIN) |
1941 | break; | |
93af5e93 GU |
1942 | |
1943 | mdelay(i); | |
aa42240a TF |
1944 | cond_resched(); |
1945 | } | |
1946 | ||
1947 | if (ret < 0) { | |
1948 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1949 | pd->name, ret); | |
1950 | return; | |
1951 | } | |
1952 | ||
1953 | /* Check if PM domain can be powered off after removing this device. */ | |
1954 | genpd_queue_power_off_work(pd); | |
1955 | } | |
1956 | ||
632f7ce3 RK |
1957 | static void genpd_dev_pm_sync(struct device *dev) |
1958 | { | |
1959 | struct generic_pm_domain *pd; | |
1960 | ||
1961 | pd = dev_to_genpd(dev); | |
1962 | if (IS_ERR(pd)) | |
1963 | return; | |
1964 | ||
1965 | genpd_queue_power_off_work(pd); | |
1966 | } | |
1967 | ||
aa42240a TF |
1968 | /** |
1969 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1970 | * @dev: Device to attach. | |
1971 | * | |
1972 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1973 | * attaches the device to retrieved pm_domain ops. | |
1974 | * | |
1975 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1976 | * backwards compatibility with existing DTBs. | |
1977 | * | |
311fa6ad JH |
1978 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1979 | * that if a power-domain exists for the device, but it cannot be found or | |
1980 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1981 | * probed and to re-try again later. | |
aa42240a TF |
1982 | */ |
1983 | int genpd_dev_pm_attach(struct device *dev) | |
1984 | { | |
1985 | struct of_phandle_args pd_args; | |
1986 | struct generic_pm_domain *pd; | |
93af5e93 | 1987 | unsigned int i; |
aa42240a TF |
1988 | int ret; |
1989 | ||
1990 | if (!dev->of_node) | |
1991 | return -ENODEV; | |
1992 | ||
1993 | if (dev->pm_domain) | |
1994 | return -EEXIST; | |
1995 | ||
1996 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1997 | "#power-domain-cells", 0, &pd_args); | |
1998 | if (ret < 0) { | |
1999 | if (ret != -ENOENT) | |
2000 | return ret; | |
2001 | ||
2002 | /* | |
2003 | * Try legacy Samsung-specific bindings | |
2004 | * (for backwards compatibility of DT ABI) | |
2005 | */ | |
2006 | pd_args.args_count = 0; | |
2007 | pd_args.np = of_parse_phandle(dev->of_node, | |
2008 | "samsung,power-domain", 0); | |
2009 | if (!pd_args.np) | |
2010 | return -ENOENT; | |
2011 | } | |
2012 | ||
19efa5ff | 2013 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2014 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2015 | of_node_put(pd_args.np); |
aa42240a | 2016 | if (IS_ERR(pd)) { |
19efa5ff | 2017 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2018 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2019 | __func__, PTR_ERR(pd)); | |
311fa6ad | 2020 | return -EPROBE_DEFER; |
aa42240a TF |
2021 | } |
2022 | ||
2023 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2024 | ||
93af5e93 | 2025 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
19efa5ff | 2026 | ret = genpd_add_device(pd, dev, NULL); |
aa42240a TF |
2027 | if (ret != -EAGAIN) |
2028 | break; | |
93af5e93 GU |
2029 | |
2030 | mdelay(i); | |
aa42240a TF |
2031 | cond_resched(); |
2032 | } | |
19efa5ff | 2033 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2034 | |
2035 | if (ret < 0) { | |
34994692 GU |
2036 | if (ret != -EPROBE_DEFER) |
2037 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2038 | pd->name, ret); | |
311fa6ad | 2039 | goto out; |
aa42240a TF |
2040 | } |
2041 | ||
2042 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2043 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2044 | |
35241d12 | 2045 | genpd_lock(pd); |
86e12eac | 2046 | ret = genpd_power_on(pd, 0); |
35241d12 | 2047 | genpd_unlock(pd); |
311fa6ad JH |
2048 | out: |
2049 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2050 | } |
2051 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
30f60428 LI |
2052 | |
2053 | static const struct of_device_id idle_state_match[] = { | |
598da548 | 2054 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2055 | { } |
2056 | }; | |
2057 | ||
2058 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2059 | struct device_node *state_node) | |
2060 | { | |
2061 | int err; | |
2062 | u32 residency; | |
2063 | u32 entry_latency, exit_latency; | |
2064 | const struct of_device_id *match_id; | |
2065 | ||
2066 | match_id = of_match_node(idle_state_match, state_node); | |
2067 | if (!match_id) | |
2068 | return -EINVAL; | |
2069 | ||
2070 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2071 | &entry_latency); | |
2072 | if (err) { | |
2073 | pr_debug(" * %s missing entry-latency-us property\n", | |
2074 | state_node->full_name); | |
2075 | return -EINVAL; | |
2076 | } | |
2077 | ||
2078 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2079 | &exit_latency); | |
2080 | if (err) { | |
2081 | pr_debug(" * %s missing exit-latency-us property\n", | |
2082 | state_node->full_name); | |
2083 | return -EINVAL; | |
2084 | } | |
2085 | ||
2086 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2087 | if (!err) | |
2088 | genpd_state->residency_ns = 1000 * residency; | |
2089 | ||
2090 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2091 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2092 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2093 | |
2094 | return 0; | |
2095 | } | |
2096 | ||
2097 | /** | |
2098 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2099 | * | |
2100 | * @dn: The genpd device node | |
2101 | * @states: The pointer to which the state array will be saved. | |
2102 | * @n: The count of elements in the array returned from this function. | |
2103 | * | |
2104 | * Returns the device states parsed from the OF node. The memory for the states | |
2105 | * is allocated by this function and is the responsibility of the caller to | |
2106 | * free the memory after use. | |
2107 | */ | |
2108 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2109 | struct genpd_power_state **states, int *n) | |
2110 | { | |
2111 | struct genpd_power_state *st; | |
2112 | struct device_node *np; | |
2113 | int i = 0; | |
2114 | int err, ret; | |
2115 | int count; | |
2116 | struct of_phandle_iterator it; | |
2117 | ||
2118 | count = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
a1fee00d | 2119 | if (count <= 0) |
30f60428 LI |
2120 | return -EINVAL; |
2121 | ||
2122 | st = kcalloc(count, sizeof(*st), GFP_KERNEL); | |
2123 | if (!st) | |
2124 | return -ENOMEM; | |
2125 | ||
2126 | /* Loop over the phandles until all the requested entry is found */ | |
2127 | of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) { | |
2128 | np = it.node; | |
2129 | ret = genpd_parse_state(&st[i++], np); | |
2130 | if (ret) { | |
2131 | pr_err | |
2132 | ("Parsing idle state node %s failed with err %d\n", | |
2133 | np->full_name, ret); | |
2134 | of_node_put(np); | |
2135 | kfree(st); | |
2136 | return ret; | |
2137 | } | |
2138 | } | |
2139 | ||
2140 | *n = count; | |
2141 | *states = st; | |
2142 | ||
2143 | return 0; | |
2144 | } | |
2145 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2146 | ||
d30d819d | 2147 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2148 | |
2149 | ||
2150 | /*** debugfs support ***/ | |
2151 | ||
8b0510b5 | 2152 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2153 | #include <linux/pm.h> |
2154 | #include <linux/device.h> | |
2155 | #include <linux/debugfs.h> | |
2156 | #include <linux/seq_file.h> | |
2157 | #include <linux/init.h> | |
2158 | #include <linux/kobject.h> | |
2159 | static struct dentry *pm_genpd_debugfs_dir; | |
2160 | ||
2161 | /* | |
2162 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2163 | * from sysfs.c, so generalize it. |
2bd5306a | 2164 | */ |
2bd5306a MM |
2165 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2166 | { | |
2167 | static const char * const status_lookup[] = { | |
2168 | [RPM_ACTIVE] = "active", | |
2169 | [RPM_RESUMING] = "resuming", | |
2170 | [RPM_SUSPENDED] = "suspended", | |
2171 | [RPM_SUSPENDING] = "suspending" | |
2172 | }; | |
2173 | const char *p = ""; | |
2174 | ||
2175 | if (dev->power.runtime_error) | |
2176 | p = "error"; | |
2177 | else if (dev->power.disable_depth) | |
2178 | p = "unsupported"; | |
2179 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2180 | p = status_lookup[dev->power.runtime_status]; | |
2181 | else | |
2182 | WARN_ON(1); | |
2183 | ||
2184 | seq_puts(s, p); | |
2185 | } | |
2bd5306a MM |
2186 | |
2187 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2188 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2189 | { |
2190 | static const char * const status_lookup[] = { | |
2191 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2192 | [GPD_STATE_POWER_OFF] = "off" |
2193 | }; | |
2194 | struct pm_domain_data *pm_data; | |
2195 | const char *kobj_path; | |
2196 | struct gpd_link *link; | |
6954d432 | 2197 | char state[16]; |
2bd5306a MM |
2198 | int ret; |
2199 | ||
35241d12 | 2200 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2201 | if (ret) |
2202 | return -ERESTARTSYS; | |
2203 | ||
66a5ca4b | 2204 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2205 | goto exit; |
fc5cbf0c | 2206 | if (genpd->status == GPD_STATE_POWER_OFF) |
0ba554e4 | 2207 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2208 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2209 | else |
6954d432 GU |
2210 | snprintf(state, sizeof(state), "%s", |
2211 | status_lookup[genpd->status]); | |
2212 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2213 | |
2214 | /* | |
2215 | * Modifications on the list require holding locks on both | |
2216 | * master and slave, so we are safe. | |
66a5ca4b | 2217 | * Also genpd->name is immutable. |
2bd5306a | 2218 | */ |
66a5ca4b | 2219 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2220 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2221 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2222 | seq_puts(s, ", "); |
2223 | } | |
2224 | ||
66a5ca4b | 2225 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2226 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2227 | genpd_is_irq_safe(genpd) ? | |
2228 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2229 | if (kobj_path == NULL) |
2230 | continue; | |
2231 | ||
2232 | seq_printf(s, "\n %-50s ", kobj_path); | |
2233 | rtpm_status_str(s, pm_data->dev); | |
2234 | kfree(kobj_path); | |
2235 | } | |
2236 | ||
2237 | seq_puts(s, "\n"); | |
2238 | exit: | |
35241d12 | 2239 | genpd_unlock(genpd); |
2bd5306a MM |
2240 | |
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2245 | { | |
66a5ca4b | 2246 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2247 | int ret = 0; |
2248 | ||
15dec67a GU |
2249 | seq_puts(s, "domain status slaves\n"); |
2250 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2251 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2252 | ||
2253 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2254 | if (ret) | |
2255 | return -ERESTARTSYS; | |
2256 | ||
66a5ca4b KH |
2257 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2258 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2259 | if (ret) |
2260 | break; | |
2261 | } | |
2262 | mutex_unlock(&gpd_list_lock); | |
2263 | ||
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2268 | { | |
2269 | return single_open(file, pm_genpd_summary_show, NULL); | |
2270 | } | |
2271 | ||
2272 | static const struct file_operations pm_genpd_summary_fops = { | |
2273 | .open = pm_genpd_summary_open, | |
2274 | .read = seq_read, | |
2275 | .llseek = seq_lseek, | |
2276 | .release = single_release, | |
2277 | }; | |
2278 | ||
2279 | static int __init pm_genpd_debug_init(void) | |
2280 | { | |
2281 | struct dentry *d; | |
2282 | ||
2283 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2284 | ||
2285 | if (!pm_genpd_debugfs_dir) | |
2286 | return -ENOMEM; | |
2287 | ||
2288 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2289 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2290 | if (!d) | |
2291 | return -ENOMEM; | |
2292 | ||
2293 | return 0; | |
2294 | } | |
2295 | late_initcall(pm_genpd_debug_init); | |
2296 | ||
2297 | static void __exit pm_genpd_debug_exit(void) | |
2298 | { | |
2299 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2300 | } | |
2301 | __exitcall(pm_genpd_debug_exit); | |
8b0510b5 | 2302 | #endif /* CONFIG_DEBUG_FS */ |