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 | ||
133 | /* Warn once for each IRQ safe dev in no sleep domain */ | |
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 | ||
a4630c61 | 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 | ||
a4630c61 | 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 | /** |
7420aa4f | 265 | * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). |
a3d09c73 | 266 | * @genpd: PM domain to power off. |
29e47e21 | 267 | * |
7420aa4f | 268 | * Queue up the execution of genpd_poweroff() 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 | /** |
53af16f7 | 277 | * genpd_poweron - 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 | */ | |
53af16f7 | 284 | static int genpd_poweron(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); |
53af16f7 | 303 | ret = genpd_poweron(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 | ||
a4630c61 | 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 | /** |
7420aa4f | 371 | * genpd_poweroff - 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 | */ |
7420aa4f | 378 | static int genpd_poweroff(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 |
7420aa4f UH |
430 | * managed to call genpd_poweron() for the master yet after |
431 | * incrementing it. In that case genpd_poweron() will wait | |
3c07cbc4 | 432 | * for us to drop the lock, so we can call .power_off() and let |
7420aa4f | 433 | * the genpd_poweron() restore power for us (this shouldn't |
3c07cbc4 RW |
434 | * happen very often). |
435 | */ | |
a4630c61 | 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); |
7420aa4f | 462 | genpd_poweroff(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. */ |
ffe12855 UH |
547 | if (runtime_pm) |
548 | time_start = ktime_get(); | |
2b1d88cd | 549 | |
54eeddbf | 550 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
551 | if (ret) |
552 | return ret; | |
17b75eca | 553 | |
2b1d88cd | 554 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 555 | if (ret) { |
54eeddbf | 556 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
557 | return ret; |
558 | } | |
559 | ||
2b1d88cd | 560 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
561 | if (runtime_pm) { |
562 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
563 | if (elapsed_ns > td->suspend_latency_ns) { | |
564 | td->suspend_latency_ns = elapsed_ns; | |
565 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
566 | elapsed_ns); | |
567 | genpd->max_off_time_changed = true; | |
568 | td->constraint_changed = true; | |
569 | } | |
2b1d88cd UH |
570 | } |
571 | ||
0aa2a221 | 572 | /* |
d716f479 LI |
573 | * If power.irq_safe is set, this routine may be run with |
574 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 575 | */ |
d716f479 | 576 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
577 | return 0; |
578 | ||
35241d12 | 579 | genpd_lock(genpd); |
7420aa4f | 580 | genpd_poweroff(genpd, false); |
35241d12 | 581 | genpd_unlock(genpd); |
f721889f RW |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
f721889f | 586 | /** |
795bd2e7 | 587 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
588 | * @dev: Device to resume. |
589 | * | |
590 | * Carry out a runtime resume of a device under the assumption that its | |
591 | * pm_domain field points to the domain member of an object of type | |
592 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
593 | */ | |
795bd2e7 | 594 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
595 | { |
596 | struct generic_pm_domain *genpd; | |
2b1d88cd | 597 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 598 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
599 | ktime_t time_start; |
600 | s64 elapsed_ns; | |
f721889f | 601 | int ret; |
ba2bbfbf | 602 | bool timed = true; |
f721889f RW |
603 | |
604 | dev_dbg(dev, "%s()\n", __func__); | |
605 | ||
5248051b RW |
606 | genpd = dev_to_genpd(dev); |
607 | if (IS_ERR(genpd)) | |
f721889f RW |
608 | return -EINVAL; |
609 | ||
d716f479 LI |
610 | /* |
611 | * As we don't power off a non IRQ safe domain, which holds | |
612 | * an IRQ safe device, we don't need to restore power to it. | |
613 | */ | |
614 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
615 | timed = false; |
616 | goto out; | |
617 | } | |
0aa2a221 | 618 | |
35241d12 | 619 | genpd_lock(genpd); |
53af16f7 | 620 | ret = genpd_poweron(genpd, 0); |
35241d12 | 621 | genpd_unlock(genpd); |
c6d22b37 | 622 | |
ba2bbfbf UH |
623 | if (ret) |
624 | return ret; | |
c6d22b37 | 625 | |
ba2bbfbf | 626 | out: |
2b1d88cd | 627 | /* Measure resume latency. */ |
ffe12855 | 628 | if (timed && runtime_pm) |
2b1d88cd UH |
629 | time_start = ktime_get(); |
630 | ||
076395ca LP |
631 | ret = genpd_start_dev(genpd, dev); |
632 | if (ret) | |
633 | goto err_poweroff; | |
634 | ||
54eeddbf | 635 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
636 | if (ret) |
637 | goto err_stop; | |
2b1d88cd UH |
638 | |
639 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 640 | if (timed && runtime_pm) { |
2b1d88cd UH |
641 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
642 | if (elapsed_ns > td->resume_latency_ns) { | |
643 | td->resume_latency_ns = elapsed_ns; | |
644 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
645 | elapsed_ns); | |
646 | genpd->max_off_time_changed = true; | |
647 | td->constraint_changed = true; | |
648 | } | |
649 | } | |
17b75eca | 650 | |
f721889f | 651 | return 0; |
076395ca LP |
652 | |
653 | err_stop: | |
654 | genpd_stop_dev(genpd, dev); | |
655 | err_poweroff: | |
d716f479 LI |
656 | if (!pm_runtime_is_irq_safe(dev) || |
657 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 658 | genpd_lock(genpd); |
076395ca | 659 | genpd_poweroff(genpd, 0); |
35241d12 | 660 | genpd_unlock(genpd); |
076395ca LP |
661 | } |
662 | ||
663 | return ret; | |
f721889f RW |
664 | } |
665 | ||
39ac5ba5 TB |
666 | static bool pd_ignore_unused; |
667 | static int __init pd_ignore_unused_setup(char *__unused) | |
668 | { | |
669 | pd_ignore_unused = true; | |
670 | return 1; | |
671 | } | |
672 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
673 | ||
17f2ae7f | 674 | /** |
bb4b72fc | 675 | * genpd_poweroff_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 676 | */ |
bb4b72fc | 677 | static int __init genpd_poweroff_unused(void) |
17f2ae7f RW |
678 | { |
679 | struct generic_pm_domain *genpd; | |
680 | ||
39ac5ba5 TB |
681 | if (pd_ignore_unused) { |
682 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 683 | return 0; |
39ac5ba5 TB |
684 | } |
685 | ||
17f2ae7f RW |
686 | mutex_lock(&gpd_list_lock); |
687 | ||
688 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
689 | genpd_queue_power_off_work(genpd); | |
690 | ||
691 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 692 | |
2fe71dcd UH |
693 | return 0; |
694 | } | |
695 | late_initcall(genpd_poweroff_unused); | |
696 | ||
0159ec67 | 697 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 698 | |
77f827de RW |
699 | /** |
700 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
701 | * @genpd: PM domain to check. | |
702 | */ | |
895b31f3 | 703 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 704 | { |
895b31f3 | 705 | const struct generic_pm_domain *gpd; |
77f827de RW |
706 | |
707 | if (IS_ERR_OR_NULL(genpd)) | |
708 | return false; | |
709 | ||
710 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
711 | if (gpd == genpd) | |
712 | return true; | |
713 | ||
714 | return false; | |
715 | } | |
716 | ||
0159ec67 JH |
717 | #endif |
718 | ||
719 | #ifdef CONFIG_PM_SLEEP | |
720 | ||
d5e4cbfe RW |
721 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
722 | struct device *dev) | |
723 | { | |
724 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
725 | } | |
726 | ||
596ba34b | 727 | /** |
eefdee07 | 728 | * genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
729 | * @genpd: PM domain to power off, if possible. |
730 | * | |
731 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 732 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 733 | * |
77f827de RW |
734 | * This function is only called in "noirq" and "syscore" stages of system power |
735 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
736 | * executed sequentially, so it is guaranteed that it will never run twice in | |
737 | * parallel). | |
596ba34b | 738 | */ |
eefdee07 | 739 | static void genpd_sync_poweroff(struct generic_pm_domain *genpd) |
596ba34b | 740 | { |
5063ce15 | 741 | struct gpd_link *link; |
596ba34b | 742 | |
17b75eca | 743 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
744 | return; |
745 | ||
c4bb3160 RW |
746 | if (genpd->suspended_count != genpd->device_count |
747 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
748 | return; |
749 | ||
fc5cbf0c AH |
750 | /* Choose the deepest state when suspending */ |
751 | genpd->state_idx = genpd->state_count - 1; | |
adb560b3 | 752 | genpd_power_off(genpd, false); |
596ba34b | 753 | |
17b75eca | 754 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
755 | |
756 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
757 | genpd_sd_counter_dec(link->master); | |
eefdee07 | 758 | genpd_sync_poweroff(link->master); |
596ba34b RW |
759 | } |
760 | } | |
761 | ||
802d8b49 | 762 | /** |
eefdee07 | 763 | * genpd_sync_poweron - Synchronously power on a PM domain and its masters. |
802d8b49 RW |
764 | * @genpd: PM domain to power on. |
765 | * | |
77f827de RW |
766 | * This function is only called in "noirq" and "syscore" stages of system power |
767 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
768 | * executed sequentially, so it is guaranteed that it will never run twice in | |
769 | * parallel). | |
802d8b49 | 770 | */ |
eefdee07 | 771 | static void genpd_sync_poweron(struct generic_pm_domain *genpd) |
802d8b49 RW |
772 | { |
773 | struct gpd_link *link; | |
774 | ||
ba2bbfbf | 775 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
776 | return; |
777 | ||
778 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
eefdee07 | 779 | genpd_sync_poweron(link->master); |
802d8b49 RW |
780 | genpd_sd_counter_inc(link->master); |
781 | } | |
782 | ||
adb560b3 | 783 | genpd_power_on(genpd, false); |
802d8b49 RW |
784 | |
785 | genpd->status = GPD_STATE_ACTIVE; | |
786 | } | |
787 | ||
4ecd6e65 RW |
788 | /** |
789 | * resume_needed - Check whether to resume a device before system suspend. | |
790 | * @dev: Device to check. | |
791 | * @genpd: PM domain the device belongs to. | |
792 | * | |
793 | * There are two cases in which a device that can wake up the system from sleep | |
794 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
795 | * to wake up the system and it has to remain active for this purpose while the | |
796 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
797 | * the system from sleep states and it generally doesn't generate wakeup signals | |
798 | * by itself (those signals are generated on its behalf by other parts of the | |
799 | * system). In the latter case it may be necessary to reconfigure the device's | |
800 | * wakeup settings during system suspend, because it may have been set up to | |
801 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
802 | * Return 'true' in either of the above cases. | |
803 | */ | |
804 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
805 | { | |
806 | bool active_wakeup; | |
807 | ||
808 | if (!device_can_wakeup(dev)) | |
809 | return false; | |
810 | ||
d5e4cbfe | 811 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
812 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
813 | } | |
814 | ||
596ba34b RW |
815 | /** |
816 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
817 | * @dev: Device to start the transition of. | |
818 | * | |
819 | * Start a power transition of a device (during a system-wide power transition) | |
820 | * under the assumption that its pm_domain field points to the domain member of | |
821 | * an object of type struct generic_pm_domain representing a PM domain | |
822 | * consisting of I/O devices. | |
823 | */ | |
824 | static int pm_genpd_prepare(struct device *dev) | |
825 | { | |
826 | struct generic_pm_domain *genpd; | |
b6c10c84 | 827 | int ret; |
596ba34b RW |
828 | |
829 | dev_dbg(dev, "%s()\n", __func__); | |
830 | ||
831 | genpd = dev_to_genpd(dev); | |
832 | if (IS_ERR(genpd)) | |
833 | return -EINVAL; | |
834 | ||
17b75eca RW |
835 | /* |
836 | * If a wakeup request is pending for the device, it should be woken up | |
837 | * at this point and a system wakeup event should be reported if it's | |
838 | * set up to wake up the system from sleep states. | |
839 | */ | |
4ecd6e65 RW |
840 | if (resume_needed(dev, genpd)) |
841 | pm_runtime_resume(dev); | |
842 | ||
35241d12 | 843 | genpd_lock(genpd); |
596ba34b | 844 | |
39dd0f23 | 845 | if (genpd->prepared_count++ == 0) |
65533bbf | 846 | genpd->suspended_count = 0; |
17b75eca | 847 | |
35241d12 | 848 | genpd_unlock(genpd); |
596ba34b | 849 | |
b6c10c84 RW |
850 | ret = pm_generic_prepare(dev); |
851 | if (ret) { | |
35241d12 | 852 | genpd_lock(genpd); |
b6c10c84 | 853 | |
39dd0f23 | 854 | genpd->prepared_count--; |
b6c10c84 | 855 | |
35241d12 | 856 | genpd_unlock(genpd); |
b6c10c84 | 857 | } |
17b75eca | 858 | |
b6c10c84 | 859 | return ret; |
596ba34b RW |
860 | } |
861 | ||
0496c8ae RW |
862 | /** |
863 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
864 | * @dev: Device to suspend. | |
865 | * | |
866 | * Stop the device and remove power from the domain if all devices in it have | |
867 | * been stopped. | |
868 | */ | |
869 | static int pm_genpd_suspend_noirq(struct device *dev) | |
870 | { | |
871 | struct generic_pm_domain *genpd; | |
122a2237 | 872 | int ret; |
0496c8ae RW |
873 | |
874 | dev_dbg(dev, "%s()\n", __func__); | |
875 | ||
876 | genpd = dev_to_genpd(dev); | |
877 | if (IS_ERR(genpd)) | |
878 | return -EINVAL; | |
596ba34b | 879 | |
39dd0f23 | 880 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
881 | return 0; |
882 | ||
122a2237 UH |
883 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
884 | ret = pm_runtime_force_suspend(dev); | |
885 | if (ret) | |
886 | return ret; | |
887 | } | |
888 | ||
596ba34b RW |
889 | /* |
890 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
891 | * guaranteed that this function will never run twice in parallel for | |
892 | * the same PM domain, so it is not necessary to use locking here. | |
893 | */ | |
894 | genpd->suspended_count++; | |
eefdee07 | 895 | genpd_sync_poweroff(genpd); |
596ba34b RW |
896 | |
897 | return 0; | |
898 | } | |
899 | ||
900 | /** | |
0496c8ae | 901 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
902 | * @dev: Device to resume. |
903 | * | |
0496c8ae | 904 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
905 | */ |
906 | static int pm_genpd_resume_noirq(struct device *dev) | |
907 | { | |
908 | struct generic_pm_domain *genpd; | |
122a2237 | 909 | int ret = 0; |
596ba34b RW |
910 | |
911 | dev_dbg(dev, "%s()\n", __func__); | |
912 | ||
913 | genpd = dev_to_genpd(dev); | |
914 | if (IS_ERR(genpd)) | |
915 | return -EINVAL; | |
916 | ||
39dd0f23 | 917 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
918 | return 0; |
919 | ||
920 | /* | |
921 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
922 | * guaranteed that this function will never run twice in parallel for | |
923 | * the same PM domain, so it is not necessary to use locking here. | |
924 | */ | |
eefdee07 | 925 | genpd_sync_poweron(genpd); |
596ba34b | 926 | genpd->suspended_count--; |
596ba34b | 927 | |
122a2237 UH |
928 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
929 | ret = pm_runtime_force_resume(dev); | |
930 | ||
931 | return ret; | |
596ba34b RW |
932 | } |
933 | ||
0496c8ae RW |
934 | /** |
935 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
936 | * @dev: Device to freeze. |
937 | * | |
938 | * Carry out a late freeze of a device under the assumption that its | |
939 | * pm_domain field points to the domain member of an object of type | |
940 | * struct generic_pm_domain representing a power domain consisting of I/O | |
941 | * devices. | |
942 | */ | |
943 | static int pm_genpd_freeze_noirq(struct device *dev) | |
944 | { | |
945 | struct generic_pm_domain *genpd; | |
122a2237 | 946 | int ret = 0; |
596ba34b RW |
947 | |
948 | dev_dbg(dev, "%s()\n", __func__); | |
949 | ||
950 | genpd = dev_to_genpd(dev); | |
951 | if (IS_ERR(genpd)) | |
952 | return -EINVAL; | |
953 | ||
122a2237 UH |
954 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
955 | ret = pm_runtime_force_suspend(dev); | |
956 | ||
957 | return ret; | |
0496c8ae | 958 | } |
596ba34b | 959 | |
0496c8ae RW |
960 | /** |
961 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
962 | * @dev: Device to thaw. | |
963 | * | |
964 | * Start the device, unless power has been removed from the domain already | |
965 | * before the system transition. | |
966 | */ | |
967 | static int pm_genpd_thaw_noirq(struct device *dev) | |
968 | { | |
969 | struct generic_pm_domain *genpd; | |
122a2237 | 970 | int ret = 0; |
596ba34b | 971 | |
0496c8ae | 972 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 973 | |
0496c8ae RW |
974 | genpd = dev_to_genpd(dev); |
975 | if (IS_ERR(genpd)) | |
976 | return -EINVAL; | |
977 | ||
122a2237 UH |
978 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
979 | ret = pm_runtime_force_resume(dev); | |
980 | ||
981 | return ret; | |
596ba34b RW |
982 | } |
983 | ||
596ba34b | 984 | /** |
0496c8ae | 985 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
986 | * @dev: Device to resume. |
987 | * | |
0496c8ae RW |
988 | * Make sure the domain will be in the same power state as before the |
989 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
990 | */ |
991 | static int pm_genpd_restore_noirq(struct device *dev) | |
992 | { | |
993 | struct generic_pm_domain *genpd; | |
122a2237 | 994 | int ret = 0; |
596ba34b RW |
995 | |
996 | dev_dbg(dev, "%s()\n", __func__); | |
997 | ||
998 | genpd = dev_to_genpd(dev); | |
999 | if (IS_ERR(genpd)) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | /* | |
1003 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1004 | * guaranteed that this function will never run twice in parallel for | |
1005 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1006 | * |
1007 | * At this point suspended_count == 0 means we are being run for the | |
1008 | * first time for the given domain in the present cycle. | |
596ba34b | 1009 | */ |
39dd0f23 | 1010 | if (genpd->suspended_count++ == 0) |
596ba34b | 1011 | /* |
65533bbf | 1012 | * The boot kernel might put the domain into arbitrary state, |
eefdee07 | 1013 | * so make it appear as powered off to genpd_sync_poweron(), |
802d8b49 | 1014 | * so that it tries to power it on in case it was really off. |
596ba34b | 1015 | */ |
65533bbf | 1016 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1017 | |
eefdee07 | 1018 | genpd_sync_poweron(genpd); |
596ba34b | 1019 | |
122a2237 UH |
1020 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1021 | ret = pm_runtime_force_resume(dev); | |
1022 | ||
1023 | return ret; | |
596ba34b RW |
1024 | } |
1025 | ||
1026 | /** | |
1027 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1028 | * @dev: Device to complete the transition of. | |
1029 | * | |
1030 | * Complete a power transition of a device (during a system-wide power | |
1031 | * transition) under the assumption that its pm_domain field points to the | |
1032 | * domain member of an object of type struct generic_pm_domain representing | |
1033 | * a power domain consisting of I/O devices. | |
1034 | */ | |
1035 | static void pm_genpd_complete(struct device *dev) | |
1036 | { | |
1037 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1038 | |
1039 | dev_dbg(dev, "%s()\n", __func__); | |
1040 | ||
1041 | genpd = dev_to_genpd(dev); | |
1042 | if (IS_ERR(genpd)) | |
1043 | return; | |
1044 | ||
4d23a5e8 UH |
1045 | pm_generic_complete(dev); |
1046 | ||
35241d12 | 1047 | genpd_lock(genpd); |
596ba34b | 1048 | |
39dd0f23 | 1049 | genpd->prepared_count--; |
4d23a5e8 UH |
1050 | if (!genpd->prepared_count) |
1051 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1052 | |
35241d12 | 1053 | genpd_unlock(genpd); |
596ba34b RW |
1054 | } |
1055 | ||
77f827de | 1056 | /** |
d47e6464 | 1057 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1058 | * @dev: Device that normally is marked as "always on" to switch power for. |
1059 | * | |
1060 | * This routine may only be called during the system core (syscore) suspend or | |
1061 | * resume phase for devices whose "always on" flags are set. | |
1062 | */ | |
d47e6464 | 1063 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1064 | { |
1065 | struct generic_pm_domain *genpd; | |
1066 | ||
1067 | genpd = dev_to_genpd(dev); | |
1068 | if (!pm_genpd_present(genpd)) | |
1069 | return; | |
1070 | ||
1071 | if (suspend) { | |
1072 | genpd->suspended_count++; | |
eefdee07 | 1073 | genpd_sync_poweroff(genpd); |
77f827de | 1074 | } else { |
eefdee07 | 1075 | genpd_sync_poweron(genpd); |
77f827de RW |
1076 | genpd->suspended_count--; |
1077 | } | |
1078 | } | |
d47e6464 UH |
1079 | |
1080 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1081 | { | |
1082 | genpd_syscore_switch(dev, true); | |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1085 | ||
1086 | void pm_genpd_syscore_poweron(struct device *dev) | |
1087 | { | |
1088 | genpd_syscore_switch(dev, false); | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1091 | |
d30d819d | 1092 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1093 | |
1094 | #define pm_genpd_prepare NULL | |
596ba34b RW |
1095 | #define pm_genpd_suspend_noirq NULL |
1096 | #define pm_genpd_resume_noirq NULL | |
596ba34b RW |
1097 | #define pm_genpd_freeze_noirq NULL |
1098 | #define pm_genpd_thaw_noirq NULL | |
596ba34b | 1099 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1100 | #define pm_genpd_complete NULL |
1101 | ||
1102 | #endif /* CONFIG_PM_SLEEP */ | |
1103 | ||
f104e1e5 UH |
1104 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1105 | struct generic_pm_domain *genpd, | |
1106 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1107 | { |
1108 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1109 | int ret; |
1110 | ||
1111 | ret = dev_pm_get_subsys_data(dev); | |
1112 | if (ret) | |
1113 | return ERR_PTR(ret); | |
1d5fcfec RW |
1114 | |
1115 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1116 | if (!gpd_data) { |
1117 | ret = -ENOMEM; | |
1118 | goto err_put; | |
1119 | } | |
1d5fcfec | 1120 | |
f104e1e5 UH |
1121 | if (td) |
1122 | gpd_data->td = *td; | |
1123 | ||
1124 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1125 | gpd_data->td.constraint_changed = true; |
1126 | gpd_data->td.effective_constraint_ns = -1; | |
1127 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1128 | ||
1129 | spin_lock_irq(&dev->power.lock); | |
1130 | ||
1131 | if (dev->power.subsys_data->domain_data) { | |
1132 | ret = -EINVAL; | |
1133 | goto err_free; | |
1134 | } | |
1135 | ||
1136 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1137 | |
1138 | spin_unlock_irq(&dev->power.lock); | |
1139 | ||
989561de TV |
1140 | dev_pm_domain_set(dev, &genpd->domain); |
1141 | ||
1d5fcfec | 1142 | return gpd_data; |
3e235685 | 1143 | |
f104e1e5 UH |
1144 | err_free: |
1145 | spin_unlock_irq(&dev->power.lock); | |
1146 | kfree(gpd_data); | |
3e235685 UH |
1147 | err_put: |
1148 | dev_pm_put_subsys_data(dev); | |
1149 | return ERR_PTR(ret); | |
1d5fcfec RW |
1150 | } |
1151 | ||
49d400c7 UH |
1152 | static void genpd_free_dev_data(struct device *dev, |
1153 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1154 | { |
989561de TV |
1155 | dev_pm_domain_set(dev, NULL); |
1156 | ||
f104e1e5 UH |
1157 | spin_lock_irq(&dev->power.lock); |
1158 | ||
f104e1e5 UH |
1159 | dev->power.subsys_data->domain_data = NULL; |
1160 | ||
1161 | spin_unlock_irq(&dev->power.lock); | |
1162 | ||
1d5fcfec | 1163 | kfree(gpd_data); |
3e235685 | 1164 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1165 | } |
1166 | ||
19efa5ff JH |
1167 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1168 | struct gpd_timing_data *td) | |
f721889f | 1169 | { |
c0356db7 | 1170 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1171 | int ret = 0; |
1172 | ||
1173 | dev_dbg(dev, "%s()\n", __func__); | |
1174 | ||
1175 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1176 | return -EINVAL; | |
1177 | ||
f104e1e5 | 1178 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1179 | if (IS_ERR(gpd_data)) |
1180 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1181 | |
35241d12 | 1182 | genpd_lock(genpd); |
f721889f | 1183 | |
596ba34b RW |
1184 | if (genpd->prepared_count > 0) { |
1185 | ret = -EAGAIN; | |
1186 | goto out; | |
1187 | } | |
1188 | ||
b472c2fa UH |
1189 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1190 | if (ret) | |
1191 | goto out; | |
d79b6fe1 | 1192 | |
14b53064 UH |
1193 | genpd->device_count++; |
1194 | genpd->max_off_time_changed = true; | |
1195 | ||
1d5fcfec | 1196 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1197 | |
f721889f | 1198 | out: |
35241d12 | 1199 | genpd_unlock(genpd); |
f721889f | 1200 | |
c0356db7 UH |
1201 | if (ret) |
1202 | genpd_free_dev_data(dev, gpd_data); | |
1203 | else | |
1204 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1205 | |
f721889f RW |
1206 | return ret; |
1207 | } | |
19efa5ff JH |
1208 | |
1209 | /** | |
1210 | * __pm_genpd_add_device - Add a device to an I/O PM domain. | |
1211 | * @genpd: PM domain to add the device to. | |
1212 | * @dev: Device to be added. | |
1213 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1214 | */ | |
1215 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, | |
1216 | struct gpd_timing_data *td) | |
1217 | { | |
1218 | int ret; | |
1219 | ||
1220 | mutex_lock(&gpd_list_lock); | |
1221 | ret = genpd_add_device(genpd, dev, td); | |
1222 | mutex_unlock(&gpd_list_lock); | |
1223 | ||
1224 | return ret; | |
1225 | } | |
24c96dc7 | 1226 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f | 1227 | |
85168d56 UH |
1228 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1229 | struct device *dev) | |
f721889f | 1230 | { |
6ff7bb0d | 1231 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1232 | struct pm_domain_data *pdd; |
efa69025 | 1233 | int ret = 0; |
f721889f RW |
1234 | |
1235 | dev_dbg(dev, "%s()\n", __func__); | |
1236 | ||
c0356db7 UH |
1237 | pdd = dev->power.subsys_data->domain_data; |
1238 | gpd_data = to_gpd_data(pdd); | |
1239 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1240 | ||
35241d12 | 1241 | genpd_lock(genpd); |
f721889f | 1242 | |
596ba34b RW |
1243 | if (genpd->prepared_count > 0) { |
1244 | ret = -EAGAIN; | |
1245 | goto out; | |
1246 | } | |
1247 | ||
6ff7bb0d RW |
1248 | genpd->device_count--; |
1249 | genpd->max_off_time_changed = true; | |
1250 | ||
d79b6fe1 | 1251 | if (genpd->detach_dev) |
c16561e8 | 1252 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1253 | |
efa69025 | 1254 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1255 | |
35241d12 | 1256 | genpd_unlock(genpd); |
6ff7bb0d | 1257 | |
c1dbe2fb | 1258 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1259 | |
6ff7bb0d | 1260 | return 0; |
f721889f | 1261 | |
596ba34b | 1262 | out: |
35241d12 | 1263 | genpd_unlock(genpd); |
c0356db7 | 1264 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1265 | |
1266 | return ret; | |
1267 | } | |
85168d56 UH |
1268 | |
1269 | /** | |
1270 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1271 | * @genpd: PM domain to remove the device from. | |
1272 | * @dev: Device to be removed. | |
1273 | */ | |
1274 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1275 | struct device *dev) | |
1276 | { | |
1277 | if (!genpd || genpd != genpd_lookup_dev(dev)) | |
1278 | return -EINVAL; | |
1279 | ||
1280 | return genpd_remove_device(genpd, dev); | |
1281 | } | |
24c96dc7 | 1282 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1283 | |
19efa5ff JH |
1284 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1285 | struct generic_pm_domain *subdomain) | |
f721889f | 1286 | { |
2547923d | 1287 | struct gpd_link *link, *itr; |
f721889f RW |
1288 | int ret = 0; |
1289 | ||
fb7268be RW |
1290 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1291 | || genpd == subdomain) | |
f721889f RW |
1292 | return -EINVAL; |
1293 | ||
d716f479 LI |
1294 | /* |
1295 | * If the domain can be powered on/off in an IRQ safe | |
1296 | * context, ensure that the subdomain can also be | |
1297 | * powered on/off in that context. | |
1298 | */ | |
1299 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1300 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1301 | genpd->name, subdomain->name); |
1302 | return -EINVAL; | |
1303 | } | |
1304 | ||
2547923d LI |
1305 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1306 | if (!link) | |
1307 | return -ENOMEM; | |
1308 | ||
35241d12 LI |
1309 | genpd_lock(subdomain); |
1310 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1311 | |
17b75eca | 1312 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1313 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1314 | ret = -EINVAL; |
1315 | goto out; | |
1316 | } | |
1317 | ||
2547923d LI |
1318 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1319 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1320 | ret = -EINVAL; |
1321 | goto out; | |
1322 | } | |
1323 | } | |
1324 | ||
5063ce15 RW |
1325 | link->master = genpd; |
1326 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1327 | link->slave = subdomain; |
1328 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1329 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1330 | genpd_sd_counter_inc(genpd); |
f721889f | 1331 | |
f721889f | 1332 | out: |
35241d12 LI |
1333 | genpd_unlock(genpd); |
1334 | genpd_unlock(subdomain); | |
2547923d LI |
1335 | if (ret) |
1336 | kfree(link); | |
f721889f RW |
1337 | return ret; |
1338 | } | |
19efa5ff JH |
1339 | |
1340 | /** | |
1341 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1342 | * @genpd: Master PM domain to add the subdomain to. | |
1343 | * @subdomain: Subdomain to be added. | |
1344 | */ | |
1345 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1346 | struct generic_pm_domain *subdomain) | |
1347 | { | |
1348 | int ret; | |
1349 | ||
1350 | mutex_lock(&gpd_list_lock); | |
1351 | ret = genpd_add_subdomain(genpd, subdomain); | |
1352 | mutex_unlock(&gpd_list_lock); | |
1353 | ||
1354 | return ret; | |
1355 | } | |
d60ee966 | 1356 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1357 | |
1358 | /** | |
1359 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1360 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1361 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1362 | */ |
1363 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1364 | struct generic_pm_domain *subdomain) |
f721889f | 1365 | { |
5063ce15 | 1366 | struct gpd_link *link; |
f721889f RW |
1367 | int ret = -EINVAL; |
1368 | ||
5063ce15 | 1369 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1370 | return -EINVAL; |
1371 | ||
35241d12 LI |
1372 | genpd_lock(subdomain); |
1373 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1374 | |
beda5fc1 | 1375 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1376 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1377 | subdomain->name); | |
1378 | ret = -EBUSY; | |
1379 | goto out; | |
1380 | } | |
1381 | ||
5063ce15 RW |
1382 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1383 | if (link->slave != subdomain) | |
f721889f RW |
1384 | continue; |
1385 | ||
5063ce15 RW |
1386 | list_del(&link->master_node); |
1387 | list_del(&link->slave_node); | |
1388 | kfree(link); | |
17b75eca | 1389 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1390 | genpd_sd_counter_dec(genpd); |
1391 | ||
f721889f RW |
1392 | ret = 0; |
1393 | break; | |
1394 | } | |
1395 | ||
30e7a65b | 1396 | out: |
35241d12 LI |
1397 | genpd_unlock(genpd); |
1398 | genpd_unlock(subdomain); | |
f721889f RW |
1399 | |
1400 | return ret; | |
1401 | } | |
d60ee966 | 1402 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1403 | |
59d65b73 LI |
1404 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1405 | { | |
1406 | struct genpd_power_state *state; | |
1407 | ||
1408 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1409 | if (!state) | |
1410 | return -ENOMEM; | |
1411 | ||
1412 | genpd->states = state; | |
1413 | genpd->state_count = 1; | |
1414 | genpd->free = state; | |
1415 | ||
1416 | return 0; | |
1417 | } | |
1418 | ||
d716f479 LI |
1419 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1420 | { | |
1421 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1422 | spin_lock_init(&genpd->slock); | |
1423 | genpd->lock_ops = &genpd_spin_ops; | |
1424 | } else { | |
1425 | mutex_init(&genpd->mlock); | |
1426 | genpd->lock_ops = &genpd_mtx_ops; | |
1427 | } | |
1428 | } | |
1429 | ||
f721889f RW |
1430 | /** |
1431 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1432 | * @genpd: PM domain object to initialize. | |
1433 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1434 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1435 | * |
1436 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1437 | */ |
7eb231c3 UH |
1438 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1439 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1440 | { |
59d65b73 LI |
1441 | int ret; |
1442 | ||
f721889f | 1443 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1444 | return -EINVAL; |
f721889f | 1445 | |
5063ce15 RW |
1446 | INIT_LIST_HEAD(&genpd->master_links); |
1447 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1448 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1449 | genpd_lock_init(genpd); |
f721889f RW |
1450 | genpd->gov = gov; |
1451 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1452 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1453 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1454 | genpd->device_count = 0; |
221e9b58 | 1455 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1456 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1457 | genpd->provider = NULL; |
1458 | genpd->has_provider = false; | |
795bd2e7 UH |
1459 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1460 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
596ba34b | 1461 | genpd->domain.ops.prepare = pm_genpd_prepare; |
596ba34b RW |
1462 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1463 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
596ba34b RW |
1464 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1465 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
d23b9b00 | 1466 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1467 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
596ba34b | 1468 | genpd->domain.ops.complete = pm_genpd_complete; |
c11f6f5b UH |
1469 | |
1470 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1471 | genpd->dev_ops.stop = pm_clk_suspend; | |
1472 | genpd->dev_ops.start = pm_clk_resume; | |
1473 | } | |
1474 | ||
fc5cbf0c | 1475 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1476 | if (genpd->state_count == 0) { |
1477 | ret = genpd_set_default_power_state(genpd); | |
1478 | if (ret) | |
1479 | return ret; | |
1480 | } | |
fc5cbf0c | 1481 | |
5125bbf3 RW |
1482 | mutex_lock(&gpd_list_lock); |
1483 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1484 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1485 | |
1486 | return 0; | |
5125bbf3 | 1487 | } |
be5ed55d | 1488 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1489 | |
3fe57710 JH |
1490 | static int genpd_remove(struct generic_pm_domain *genpd) |
1491 | { | |
1492 | struct gpd_link *l, *link; | |
1493 | ||
1494 | if (IS_ERR_OR_NULL(genpd)) | |
1495 | return -EINVAL; | |
1496 | ||
35241d12 | 1497 | genpd_lock(genpd); |
3fe57710 JH |
1498 | |
1499 | if (genpd->has_provider) { | |
35241d12 | 1500 | genpd_unlock(genpd); |
3fe57710 JH |
1501 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1502 | return -EBUSY; | |
1503 | } | |
1504 | ||
1505 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1506 | genpd_unlock(genpd); |
3fe57710 JH |
1507 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1508 | return -EBUSY; | |
1509 | } | |
1510 | ||
1511 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1512 | list_del(&link->master_node); | |
1513 | list_del(&link->slave_node); | |
1514 | kfree(link); | |
1515 | } | |
1516 | ||
1517 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1518 | genpd_unlock(genpd); |
3fe57710 | 1519 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1520 | kfree(genpd->free); |
3fe57710 JH |
1521 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1522 | ||
1523 | return 0; | |
1524 | } | |
1525 | ||
1526 | /** | |
1527 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1528 | * @genpd: Pointer to PM domain that is to be removed. | |
1529 | * | |
1530 | * To remove the PM domain, this function: | |
1531 | * - Removes the PM domain as a subdomain to any parent domains, | |
1532 | * if it was added. | |
1533 | * - Removes the PM domain from the list of registered PM domains. | |
1534 | * | |
1535 | * The PM domain will only be removed, if the associated provider has | |
1536 | * been removed, it is not a parent to any other PM domain and has no | |
1537 | * devices associated with it. | |
1538 | */ | |
1539 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1540 | { | |
1541 | int ret; | |
1542 | ||
1543 | mutex_lock(&gpd_list_lock); | |
1544 | ret = genpd_remove(genpd); | |
1545 | mutex_unlock(&gpd_list_lock); | |
1546 | ||
1547 | return ret; | |
1548 | } | |
1549 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1550 | ||
aa42240a | 1551 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc JH |
1552 | |
1553 | typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, | |
1554 | void *data); | |
1555 | ||
aa42240a TF |
1556 | /* |
1557 | * Device Tree based PM domain providers. | |
1558 | * | |
1559 | * The code below implements generic device tree based PM domain providers that | |
1560 | * bind device tree nodes with generic PM domains registered in the system. | |
1561 | * | |
1562 | * Any driver that registers generic PM domains and needs to support binding of | |
1563 | * devices to these domains is supposed to register a PM domain provider, which | |
1564 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1565 | * | |
1566 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1567 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1568 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1569 | * index. |
1570 | */ | |
1571 | ||
1572 | /** | |
1573 | * struct of_genpd_provider - PM domain provider registration structure | |
1574 | * @link: Entry in global list of PM domain providers | |
1575 | * @node: Pointer to device tree node of PM domain provider | |
1576 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1577 | * into a PM domain. | |
1578 | * @data: context pointer to be passed into @xlate callback | |
1579 | */ | |
1580 | struct of_genpd_provider { | |
1581 | struct list_head link; | |
1582 | struct device_node *node; | |
1583 | genpd_xlate_t xlate; | |
1584 | void *data; | |
1585 | }; | |
1586 | ||
1587 | /* List of registered PM domain providers. */ | |
1588 | static LIST_HEAD(of_genpd_providers); | |
1589 | /* Mutex to protect the list above. */ | |
1590 | static DEFINE_MUTEX(of_genpd_mutex); | |
1591 | ||
1592 | /** | |
892ebdcc | 1593 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1594 | * @genpdspec: OF phandle args to map into a PM domain |
1595 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1596 | * | |
1597 | * This is a generic xlate function that can be used to model PM domains that | |
1598 | * have their own device tree nodes. The private data of xlate function needs | |
1599 | * to be a valid pointer to struct generic_pm_domain. | |
1600 | */ | |
892ebdcc | 1601 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1602 | struct of_phandle_args *genpdspec, |
1603 | void *data) | |
1604 | { | |
1605 | if (genpdspec->args_count != 0) | |
1606 | return ERR_PTR(-EINVAL); | |
1607 | return data; | |
1608 | } | |
aa42240a TF |
1609 | |
1610 | /** | |
892ebdcc | 1611 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1612 | * @genpdspec: OF phandle args to map into a PM domain |
1613 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1614 | * | |
1615 | * This is a generic xlate function that can be used to model simple PM domain | |
1616 | * controllers that have one device tree node and provide multiple PM domains. | |
1617 | * A single cell is used as an index into an array of PM domains specified in | |
1618 | * the genpd_onecell_data struct when registering the provider. | |
1619 | */ | |
892ebdcc | 1620 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1621 | struct of_phandle_args *genpdspec, |
1622 | void *data) | |
1623 | { | |
1624 | struct genpd_onecell_data *genpd_data = data; | |
1625 | unsigned int idx = genpdspec->args[0]; | |
1626 | ||
1627 | if (genpdspec->args_count != 1) | |
1628 | return ERR_PTR(-EINVAL); | |
1629 | ||
1630 | if (idx >= genpd_data->num_domains) { | |
1631 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1632 | return ERR_PTR(-EINVAL); | |
1633 | } | |
1634 | ||
1635 | if (!genpd_data->domains[idx]) | |
1636 | return ERR_PTR(-ENOENT); | |
1637 | ||
1638 | return genpd_data->domains[idx]; | |
1639 | } | |
aa42240a TF |
1640 | |
1641 | /** | |
892ebdcc | 1642 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1643 | * @np: Device node pointer associated with the PM domain provider. |
1644 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1645 | * @data: Context pointer for @xlate callback. | |
1646 | */ | |
892ebdcc JH |
1647 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1648 | void *data) | |
aa42240a TF |
1649 | { |
1650 | struct of_genpd_provider *cp; | |
1651 | ||
1652 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1653 | if (!cp) | |
1654 | return -ENOMEM; | |
1655 | ||
1656 | cp->node = of_node_get(np); | |
1657 | cp->data = data; | |
1658 | cp->xlate = xlate; | |
1659 | ||
1660 | mutex_lock(&of_genpd_mutex); | |
1661 | list_add(&cp->link, &of_genpd_providers); | |
1662 | mutex_unlock(&of_genpd_mutex); | |
1663 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1664 | ||
1665 | return 0; | |
1666 | } | |
892ebdcc JH |
1667 | |
1668 | /** | |
1669 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1670 | * @np: Device node pointer associated with the PM domain provider. | |
1671 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1672 | */ | |
1673 | int of_genpd_add_provider_simple(struct device_node *np, | |
1674 | struct generic_pm_domain *genpd) | |
1675 | { | |
0159ec67 JH |
1676 | int ret = -EINVAL; |
1677 | ||
1678 | if (!np || !genpd) | |
1679 | return -EINVAL; | |
1680 | ||
1681 | mutex_lock(&gpd_list_lock); | |
1682 | ||
1683 | if (pm_genpd_present(genpd)) | |
1684 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); | |
1685 | ||
de0aa06d JH |
1686 | if (!ret) { |
1687 | genpd->provider = &np->fwnode; | |
1688 | genpd->has_provider = true; | |
1689 | } | |
1690 | ||
0159ec67 JH |
1691 | mutex_unlock(&gpd_list_lock); |
1692 | ||
1693 | return ret; | |
892ebdcc JH |
1694 | } |
1695 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1696 | ||
1697 | /** | |
1698 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1699 | * @np: Device node pointer associated with the PM domain provider. | |
1700 | * @data: Pointer to the data associated with the PM domain provider. | |
1701 | */ | |
1702 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1703 | struct genpd_onecell_data *data) | |
1704 | { | |
0159ec67 | 1705 | unsigned int i; |
de0aa06d | 1706 | int ret = -EINVAL; |
0159ec67 JH |
1707 | |
1708 | if (!np || !data) | |
1709 | return -EINVAL; | |
1710 | ||
1711 | mutex_lock(&gpd_list_lock); | |
1712 | ||
1713 | for (i = 0; i < data->num_domains; i++) { | |
609bed67 TV |
1714 | if (!data->domains[i]) |
1715 | continue; | |
de0aa06d JH |
1716 | if (!pm_genpd_present(data->domains[i])) |
1717 | goto error; | |
1718 | ||
1719 | data->domains[i]->provider = &np->fwnode; | |
1720 | data->domains[i]->has_provider = true; | |
0159ec67 JH |
1721 | } |
1722 | ||
1723 | ret = genpd_add_provider(np, genpd_xlate_onecell, data); | |
de0aa06d JH |
1724 | if (ret < 0) |
1725 | goto error; | |
1726 | ||
1727 | mutex_unlock(&gpd_list_lock); | |
1728 | ||
1729 | return 0; | |
1730 | ||
1731 | error: | |
1732 | while (i--) { | |
609bed67 TV |
1733 | if (!data->domains[i]) |
1734 | continue; | |
de0aa06d JH |
1735 | data->domains[i]->provider = NULL; |
1736 | data->domains[i]->has_provider = false; | |
1737 | } | |
0159ec67 JH |
1738 | |
1739 | mutex_unlock(&gpd_list_lock); | |
1740 | ||
1741 | return ret; | |
892ebdcc JH |
1742 | } |
1743 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1744 | |
1745 | /** | |
1746 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1747 | * @np: Device node pointer associated with the PM domain provider | |
1748 | */ | |
1749 | void of_genpd_del_provider(struct device_node *np) | |
1750 | { | |
1751 | struct of_genpd_provider *cp; | |
de0aa06d | 1752 | struct generic_pm_domain *gpd; |
aa42240a | 1753 | |
de0aa06d | 1754 | mutex_lock(&gpd_list_lock); |
aa42240a TF |
1755 | mutex_lock(&of_genpd_mutex); |
1756 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1757 | if (cp->node == np) { | |
de0aa06d JH |
1758 | /* |
1759 | * For each PM domain associated with the | |
1760 | * provider, set the 'has_provider' to false | |
1761 | * so that the PM domain can be safely removed. | |
1762 | */ | |
1763 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
1764 | if (gpd->provider == &np->fwnode) | |
1765 | gpd->has_provider = false; | |
1766 | ||
aa42240a TF |
1767 | list_del(&cp->link); |
1768 | of_node_put(cp->node); | |
1769 | kfree(cp); | |
1770 | break; | |
1771 | } | |
1772 | } | |
1773 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 1774 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
1775 | } |
1776 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1777 | ||
1778 | /** | |
f58d4e5a | 1779 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
1780 | * @genpdspec: OF phandle args to use for look-up |
1781 | * | |
1782 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1783 | * found, uses xlate function of the provider to map phandle args to a PM | |
1784 | * domain. | |
1785 | * | |
1786 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1787 | * on failure. | |
1788 | */ | |
f58d4e5a | 1789 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
1790 | struct of_phandle_args *genpdspec) |
1791 | { | |
1792 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1793 | struct of_genpd_provider *provider; | |
1794 | ||
41795a8a JH |
1795 | if (!genpdspec) |
1796 | return ERR_PTR(-EINVAL); | |
1797 | ||
aa42240a TF |
1798 | mutex_lock(&of_genpd_mutex); |
1799 | ||
1800 | /* Check if we have such a provider in our array */ | |
1801 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1802 | if (provider->node == genpdspec->np) | |
1803 | genpd = provider->xlate(genpdspec, provider->data); | |
1804 | if (!IS_ERR(genpd)) | |
1805 | break; | |
1806 | } | |
1807 | ||
1808 | mutex_unlock(&of_genpd_mutex); | |
1809 | ||
1810 | return genpd; | |
1811 | } | |
1812 | ||
ec69572b JH |
1813 | /** |
1814 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
1815 | * @genpdspec: OF phandle args to use for look-up PM domain | |
1816 | * @dev: Device to be added. | |
1817 | * | |
1818 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
1819 | * the device to the PM domain. Returns a negative error code on failure. | |
1820 | */ | |
1821 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
1822 | { | |
1823 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
1824 | int ret; |
1825 | ||
1826 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1827 | |
f58d4e5a | 1828 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
1829 | if (IS_ERR(genpd)) { |
1830 | ret = PTR_ERR(genpd); | |
1831 | goto out; | |
1832 | } | |
1833 | ||
1834 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 1835 | |
19efa5ff JH |
1836 | out: |
1837 | mutex_unlock(&gpd_list_lock); | |
1838 | ||
1839 | return ret; | |
ec69572b JH |
1840 | } |
1841 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
1842 | ||
1843 | /** | |
1844 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1845 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
1846 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
1847 | * | |
1848 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
1849 | * provided and adds the subdomain to the parent PM domain. Returns a | |
1850 | * negative error code on failure. | |
1851 | */ | |
1852 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
1853 | struct of_phandle_args *subdomain_spec) | |
1854 | { | |
1855 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
1856 | int ret; |
1857 | ||
1858 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1859 | |
f58d4e5a | 1860 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
1861 | if (IS_ERR(parent)) { |
1862 | ret = PTR_ERR(parent); | |
1863 | goto out; | |
1864 | } | |
ec69572b | 1865 | |
f58d4e5a | 1866 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
1867 | if (IS_ERR(subdomain)) { |
1868 | ret = PTR_ERR(subdomain); | |
1869 | goto out; | |
1870 | } | |
1871 | ||
1872 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 1873 | |
19efa5ff JH |
1874 | out: |
1875 | mutex_unlock(&gpd_list_lock); | |
1876 | ||
1877 | return ret; | |
ec69572b JH |
1878 | } |
1879 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
1880 | ||
17926551 JH |
1881 | /** |
1882 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
1883 | * @provider: Pointer to device structure associated with provider | |
1884 | * | |
1885 | * Find the last PM domain that was added by a particular provider and | |
1886 | * remove this PM domain from the list of PM domains. The provider is | |
1887 | * identified by the 'provider' device structure that is passed. The PM | |
1888 | * domain will only be removed, if the provider associated with domain | |
1889 | * has been removed. | |
1890 | * | |
1891 | * Returns a valid pointer to struct generic_pm_domain on success or | |
1892 | * ERR_PTR() on failure. | |
1893 | */ | |
1894 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
1895 | { | |
1896 | struct generic_pm_domain *gpd, *genpd = ERR_PTR(-ENOENT); | |
1897 | int ret; | |
1898 | ||
1899 | if (IS_ERR_OR_NULL(np)) | |
1900 | return ERR_PTR(-EINVAL); | |
1901 | ||
1902 | mutex_lock(&gpd_list_lock); | |
1903 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1904 | if (gpd->provider == &np->fwnode) { | |
1905 | ret = genpd_remove(gpd); | |
1906 | genpd = ret ? ERR_PTR(ret) : gpd; | |
1907 | break; | |
1908 | } | |
1909 | } | |
1910 | mutex_unlock(&gpd_list_lock); | |
1911 | ||
1912 | return genpd; | |
1913 | } | |
1914 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
1915 | ||
aa42240a TF |
1916 | /** |
1917 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1918 | * @dev: Device to detach. |
aa42240a TF |
1919 | * @power_off: Currently not used |
1920 | * | |
1921 | * Try to locate a corresponding generic PM domain, which the device was | |
1922 | * attached to previously. If such is found, the device is detached from it. | |
1923 | */ | |
1924 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1925 | { | |
446d999c | 1926 | struct generic_pm_domain *pd; |
93af5e93 | 1927 | unsigned int i; |
aa42240a TF |
1928 | int ret = 0; |
1929 | ||
85168d56 UH |
1930 | pd = dev_to_genpd(dev); |
1931 | if (IS_ERR(pd)) | |
aa42240a TF |
1932 | return; |
1933 | ||
1934 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1935 | ||
93af5e93 | 1936 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 1937 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
1938 | if (ret != -EAGAIN) |
1939 | break; | |
93af5e93 GU |
1940 | |
1941 | mdelay(i); | |
aa42240a TF |
1942 | cond_resched(); |
1943 | } | |
1944 | ||
1945 | if (ret < 0) { | |
1946 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1947 | pd->name, ret); | |
1948 | return; | |
1949 | } | |
1950 | ||
1951 | /* Check if PM domain can be powered off after removing this device. */ | |
1952 | genpd_queue_power_off_work(pd); | |
1953 | } | |
1954 | ||
632f7ce3 RK |
1955 | static void genpd_dev_pm_sync(struct device *dev) |
1956 | { | |
1957 | struct generic_pm_domain *pd; | |
1958 | ||
1959 | pd = dev_to_genpd(dev); | |
1960 | if (IS_ERR(pd)) | |
1961 | return; | |
1962 | ||
1963 | genpd_queue_power_off_work(pd); | |
1964 | } | |
1965 | ||
aa42240a TF |
1966 | /** |
1967 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1968 | * @dev: Device to attach. | |
1969 | * | |
1970 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1971 | * attaches the device to retrieved pm_domain ops. | |
1972 | * | |
1973 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1974 | * backwards compatibility with existing DTBs. | |
1975 | * | |
311fa6ad JH |
1976 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1977 | * that if a power-domain exists for the device, but it cannot be found or | |
1978 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1979 | * probed and to re-try again later. | |
aa42240a TF |
1980 | */ |
1981 | int genpd_dev_pm_attach(struct device *dev) | |
1982 | { | |
1983 | struct of_phandle_args pd_args; | |
1984 | struct generic_pm_domain *pd; | |
93af5e93 | 1985 | unsigned int i; |
aa42240a TF |
1986 | int ret; |
1987 | ||
1988 | if (!dev->of_node) | |
1989 | return -ENODEV; | |
1990 | ||
1991 | if (dev->pm_domain) | |
1992 | return -EEXIST; | |
1993 | ||
1994 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1995 | "#power-domain-cells", 0, &pd_args); | |
1996 | if (ret < 0) { | |
1997 | if (ret != -ENOENT) | |
1998 | return ret; | |
1999 | ||
2000 | /* | |
2001 | * Try legacy Samsung-specific bindings | |
2002 | * (for backwards compatibility of DT ABI) | |
2003 | */ | |
2004 | pd_args.args_count = 0; | |
2005 | pd_args.np = of_parse_phandle(dev->of_node, | |
2006 | "samsung,power-domain", 0); | |
2007 | if (!pd_args.np) | |
2008 | return -ENOENT; | |
2009 | } | |
2010 | ||
19efa5ff | 2011 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2012 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2013 | of_node_put(pd_args.np); |
aa42240a | 2014 | if (IS_ERR(pd)) { |
19efa5ff | 2015 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2016 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2017 | __func__, PTR_ERR(pd)); | |
311fa6ad | 2018 | return -EPROBE_DEFER; |
aa42240a TF |
2019 | } |
2020 | ||
2021 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2022 | ||
93af5e93 | 2023 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
19efa5ff | 2024 | ret = genpd_add_device(pd, dev, NULL); |
aa42240a TF |
2025 | if (ret != -EAGAIN) |
2026 | break; | |
93af5e93 GU |
2027 | |
2028 | mdelay(i); | |
aa42240a TF |
2029 | cond_resched(); |
2030 | } | |
19efa5ff | 2031 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2032 | |
2033 | if (ret < 0) { | |
34994692 GU |
2034 | if (ret != -EPROBE_DEFER) |
2035 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2036 | pd->name, ret); | |
311fa6ad | 2037 | goto out; |
aa42240a TF |
2038 | } |
2039 | ||
2040 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2041 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2042 | |
35241d12 | 2043 | genpd_lock(pd); |
53af16f7 | 2044 | ret = genpd_poweron(pd, 0); |
35241d12 | 2045 | genpd_unlock(pd); |
311fa6ad JH |
2046 | out: |
2047 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2048 | } |
2049 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
30f60428 LI |
2050 | |
2051 | static const struct of_device_id idle_state_match[] = { | |
598da548 | 2052 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2053 | { } |
2054 | }; | |
2055 | ||
2056 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2057 | struct device_node *state_node) | |
2058 | { | |
2059 | int err; | |
2060 | u32 residency; | |
2061 | u32 entry_latency, exit_latency; | |
2062 | const struct of_device_id *match_id; | |
2063 | ||
2064 | match_id = of_match_node(idle_state_match, state_node); | |
2065 | if (!match_id) | |
2066 | return -EINVAL; | |
2067 | ||
2068 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2069 | &entry_latency); | |
2070 | if (err) { | |
2071 | pr_debug(" * %s missing entry-latency-us property\n", | |
2072 | state_node->full_name); | |
2073 | return -EINVAL; | |
2074 | } | |
2075 | ||
2076 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2077 | &exit_latency); | |
2078 | if (err) { | |
2079 | pr_debug(" * %s missing exit-latency-us property\n", | |
2080 | state_node->full_name); | |
2081 | return -EINVAL; | |
2082 | } | |
2083 | ||
2084 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2085 | if (!err) | |
2086 | genpd_state->residency_ns = 1000 * residency; | |
2087 | ||
2088 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2089 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2090 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2091 | |
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2097 | * | |
2098 | * @dn: The genpd device node | |
2099 | * @states: The pointer to which the state array will be saved. | |
2100 | * @n: The count of elements in the array returned from this function. | |
2101 | * | |
2102 | * Returns the device states parsed from the OF node. The memory for the states | |
2103 | * is allocated by this function and is the responsibility of the caller to | |
2104 | * free the memory after use. | |
2105 | */ | |
2106 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2107 | struct genpd_power_state **states, int *n) | |
2108 | { | |
2109 | struct genpd_power_state *st; | |
2110 | struct device_node *np; | |
2111 | int i = 0; | |
2112 | int err, ret; | |
2113 | int count; | |
2114 | struct of_phandle_iterator it; | |
2115 | ||
2116 | count = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
a1fee00d | 2117 | if (count <= 0) |
30f60428 LI |
2118 | return -EINVAL; |
2119 | ||
2120 | st = kcalloc(count, sizeof(*st), GFP_KERNEL); | |
2121 | if (!st) | |
2122 | return -ENOMEM; | |
2123 | ||
2124 | /* Loop over the phandles until all the requested entry is found */ | |
2125 | of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) { | |
2126 | np = it.node; | |
2127 | ret = genpd_parse_state(&st[i++], np); | |
2128 | if (ret) { | |
2129 | pr_err | |
2130 | ("Parsing idle state node %s failed with err %d\n", | |
2131 | np->full_name, ret); | |
2132 | of_node_put(np); | |
2133 | kfree(st); | |
2134 | return ret; | |
2135 | } | |
2136 | } | |
2137 | ||
2138 | *n = count; | |
2139 | *states = st; | |
2140 | ||
2141 | return 0; | |
2142 | } | |
2143 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2144 | ||
d30d819d | 2145 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2146 | |
2147 | ||
2148 | /*** debugfs support ***/ | |
2149 | ||
8b0510b5 | 2150 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2151 | #include <linux/pm.h> |
2152 | #include <linux/device.h> | |
2153 | #include <linux/debugfs.h> | |
2154 | #include <linux/seq_file.h> | |
2155 | #include <linux/init.h> | |
2156 | #include <linux/kobject.h> | |
2157 | static struct dentry *pm_genpd_debugfs_dir; | |
2158 | ||
2159 | /* | |
2160 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2161 | * from sysfs.c, so generalize it. |
2bd5306a | 2162 | */ |
2bd5306a MM |
2163 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2164 | { | |
2165 | static const char * const status_lookup[] = { | |
2166 | [RPM_ACTIVE] = "active", | |
2167 | [RPM_RESUMING] = "resuming", | |
2168 | [RPM_SUSPENDED] = "suspended", | |
2169 | [RPM_SUSPENDING] = "suspending" | |
2170 | }; | |
2171 | const char *p = ""; | |
2172 | ||
2173 | if (dev->power.runtime_error) | |
2174 | p = "error"; | |
2175 | else if (dev->power.disable_depth) | |
2176 | p = "unsupported"; | |
2177 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2178 | p = status_lookup[dev->power.runtime_status]; | |
2179 | else | |
2180 | WARN_ON(1); | |
2181 | ||
2182 | seq_puts(s, p); | |
2183 | } | |
2bd5306a MM |
2184 | |
2185 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2186 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2187 | { |
2188 | static const char * const status_lookup[] = { | |
2189 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2190 | [GPD_STATE_POWER_OFF] = "off" |
2191 | }; | |
2192 | struct pm_domain_data *pm_data; | |
2193 | const char *kobj_path; | |
2194 | struct gpd_link *link; | |
6954d432 | 2195 | char state[16]; |
2bd5306a MM |
2196 | int ret; |
2197 | ||
35241d12 | 2198 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2199 | if (ret) |
2200 | return -ERESTARTSYS; | |
2201 | ||
66a5ca4b | 2202 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2203 | goto exit; |
fc5cbf0c | 2204 | if (genpd->status == GPD_STATE_POWER_OFF) |
0ba554e4 | 2205 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2206 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2207 | else |
6954d432 GU |
2208 | snprintf(state, sizeof(state), "%s", |
2209 | status_lookup[genpd->status]); | |
2210 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2211 | |
2212 | /* | |
2213 | * Modifications on the list require holding locks on both | |
2214 | * master and slave, so we are safe. | |
66a5ca4b | 2215 | * Also genpd->name is immutable. |
2bd5306a | 2216 | */ |
66a5ca4b | 2217 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2218 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2219 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2220 | seq_puts(s, ", "); |
2221 | } | |
2222 | ||
66a5ca4b | 2223 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2224 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2225 | genpd_is_irq_safe(genpd) ? | |
2226 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2227 | if (kobj_path == NULL) |
2228 | continue; | |
2229 | ||
2230 | seq_printf(s, "\n %-50s ", kobj_path); | |
2231 | rtpm_status_str(s, pm_data->dev); | |
2232 | kfree(kobj_path); | |
2233 | } | |
2234 | ||
2235 | seq_puts(s, "\n"); | |
2236 | exit: | |
35241d12 | 2237 | genpd_unlock(genpd); |
2bd5306a MM |
2238 | |
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2243 | { | |
66a5ca4b | 2244 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2245 | int ret = 0; |
2246 | ||
15dec67a GU |
2247 | seq_puts(s, "domain status slaves\n"); |
2248 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2249 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2250 | ||
2251 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2252 | if (ret) | |
2253 | return -ERESTARTSYS; | |
2254 | ||
66a5ca4b KH |
2255 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2256 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2257 | if (ret) |
2258 | break; | |
2259 | } | |
2260 | mutex_unlock(&gpd_list_lock); | |
2261 | ||
2262 | return ret; | |
2263 | } | |
2264 | ||
2265 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2266 | { | |
2267 | return single_open(file, pm_genpd_summary_show, NULL); | |
2268 | } | |
2269 | ||
2270 | static const struct file_operations pm_genpd_summary_fops = { | |
2271 | .open = pm_genpd_summary_open, | |
2272 | .read = seq_read, | |
2273 | .llseek = seq_lseek, | |
2274 | .release = single_release, | |
2275 | }; | |
2276 | ||
2277 | static int __init pm_genpd_debug_init(void) | |
2278 | { | |
2279 | struct dentry *d; | |
2280 | ||
2281 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2282 | ||
2283 | if (!pm_genpd_debugfs_dir) | |
2284 | return -ENOMEM; | |
2285 | ||
2286 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2287 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2288 | if (!d) | |
2289 | return -ENOMEM; | |
2290 | ||
2291 | return 0; | |
2292 | } | |
2293 | late_initcall(pm_genpd_debug_init); | |
2294 | ||
2295 | static void __exit pm_genpd_debug_exit(void) | |
2296 | { | |
2297 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2298 | } | |
2299 | __exitcall(pm_genpd_debug_exit); | |
8b0510b5 | 2300 | #endif /* CONFIG_DEBUG_FS */ |