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Commit | Line | Data |
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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 | ||
93af5e93 GU |
23 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
24 | ||
d5e4cbfe RW |
25 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
26 | ({ \ | |
27 | type (*__routine)(struct device *__d); \ | |
28 | type __ret = (type)0; \ | |
29 | \ | |
30 | __routine = genpd->dev_ops.callback; \ | |
31 | if (__routine) { \ | |
32 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
33 | } \ |
34 | __ret; \ | |
35 | }) | |
f721889f | 36 | |
0140d8bd RW |
37 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
38 | ({ \ | |
39 | ktime_t __start = ktime_get(); \ | |
40 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
41 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
42 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
43 | if (!__retval && __elapsed > __td->field) { \ | |
44 | __td->field = __elapsed; \ | |
7d1af287 | 45 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 46 | __elapsed); \ |
6ff7bb0d RW |
47 | genpd->max_off_time_changed = true; \ |
48 | __td->constraint_changed = true; \ | |
0140d8bd RW |
49 | } \ |
50 | __retval; \ | |
51 | }) | |
52 | ||
5125bbf3 RW |
53 | static LIST_HEAD(gpd_list); |
54 | static DEFINE_MUTEX(gpd_list_lock); | |
55 | ||
446d999c RK |
56 | /* |
57 | * Get the generic PM domain for a particular struct device. | |
58 | * This validates the struct device pointer, the PM domain pointer, | |
59 | * and checks that the PM domain pointer is a real generic PM domain. | |
60 | * Any failure results in NULL being returned. | |
61 | */ | |
62 | struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) | |
63 | { | |
64 | struct generic_pm_domain *genpd = NULL, *gpd; | |
65 | ||
66 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
67 | return NULL; | |
68 | ||
69 | mutex_lock(&gpd_list_lock); | |
70 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
71 | if (&gpd->domain == dev->pm_domain) { | |
72 | genpd = gpd; | |
73 | break; | |
74 | } | |
75 | } | |
76 | mutex_unlock(&gpd_list_lock); | |
77 | ||
78 | return genpd; | |
79 | } | |
80 | ||
81 | /* | |
82 | * This should only be used where we are certain that the pm_domain | |
83 | * attached to the device is a genpd domain. | |
84 | */ | |
85 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
86 | { |
87 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
88 | return ERR_PTR(-EINVAL); | |
89 | ||
596ba34b | 90 | return pd_to_genpd(dev->pm_domain); |
5248051b | 91 | } |
f721889f | 92 | |
d5e4cbfe RW |
93 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
94 | { | |
0140d8bd RW |
95 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
96 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
97 | } |
98 | ||
ba2bbfbf UH |
99 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev, |
100 | bool timed) | |
d5e4cbfe | 101 | { |
ba2bbfbf UH |
102 | if (!timed) |
103 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
104 | ||
0140d8bd RW |
105 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
106 | start_latency_ns, "start"); | |
d5e4cbfe RW |
107 | } |
108 | ||
c4bb3160 | 109 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 110 | { |
c4bb3160 RW |
111 | bool ret = false; |
112 | ||
113 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
114 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
119 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
120 | { | |
121 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 122 | smp_mb__after_atomic(); |
f721889f RW |
123 | } |
124 | ||
a4630c61 | 125 | static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
126 | { |
127 | ktime_t time_start; | |
128 | s64 elapsed_ns; | |
129 | int ret; | |
130 | ||
131 | if (!genpd->power_on) | |
132 | return 0; | |
133 | ||
a4630c61 GU |
134 | if (!timed) |
135 | return genpd->power_on(genpd); | |
136 | ||
c8f0ea45 GU |
137 | time_start = ktime_get(); |
138 | ret = genpd->power_on(genpd); | |
139 | if (ret) | |
140 | return ret; | |
141 | ||
142 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
143 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
144 | return ret; | |
145 | ||
146 | genpd->power_on_latency_ns = elapsed_ns; | |
147 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
148 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
149 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
150 | |
151 | return ret; | |
152 | } | |
153 | ||
a4630c61 | 154 | static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
155 | { |
156 | ktime_t time_start; | |
157 | s64 elapsed_ns; | |
158 | int ret; | |
159 | ||
160 | if (!genpd->power_off) | |
161 | return 0; | |
162 | ||
a4630c61 GU |
163 | if (!timed) |
164 | return genpd->power_off(genpd); | |
165 | ||
c8f0ea45 GU |
166 | time_start = ktime_get(); |
167 | ret = genpd->power_off(genpd); | |
168 | if (ret == -EBUSY) | |
169 | return ret; | |
170 | ||
171 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
172 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
173 | return ret; | |
174 | ||
175 | genpd->power_off_latency_ns = elapsed_ns; | |
176 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
177 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
178 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
179 | |
180 | return ret; | |
181 | } | |
182 | ||
29e47e21 UH |
183 | /** |
184 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
185 | * @genpd: PM domait to power off. | |
186 | * | |
187 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
188 | * before. | |
189 | */ | |
190 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
191 | { | |
192 | queue_work(pm_wq, &genpd->power_off_work); | |
193 | } | |
194 | ||
5248051b | 195 | /** |
5063ce15 | 196 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
197 | * @genpd: PM domain to power up. |
198 | * | |
5063ce15 | 199 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
200 | * resume a device belonging to it. |
201 | */ | |
8951ef02 | 202 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 203 | { |
5063ce15 | 204 | struct gpd_link *link; |
5248051b RW |
205 | int ret = 0; |
206 | ||
17b75eca | 207 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 208 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 209 | return 0; |
5248051b | 210 | |
5063ce15 RW |
211 | /* |
212 | * The list is guaranteed not to change while the loop below is being | |
213 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
214 | * with it. | |
215 | */ | |
216 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
217 | genpd_sd_counter_inc(link->master); | |
5248051b | 218 | |
5063ce15 | 219 | ret = pm_genpd_poweron(link->master); |
5063ce15 RW |
220 | if (ret) { |
221 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 222 | goto err; |
5063ce15 | 223 | } |
5248051b RW |
224 | } |
225 | ||
a4630c61 | 226 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
227 | if (ret) |
228 | goto err; | |
5248051b | 229 | |
ba2bbfbf | 230 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 231 | return 0; |
9e08cf42 RW |
232 | |
233 | err: | |
29e47e21 UH |
234 | list_for_each_entry_continue_reverse(link, |
235 | &genpd->slave_links, | |
236 | slave_node) { | |
5063ce15 | 237 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
238 | genpd_queue_power_off_work(link->master); |
239 | } | |
9e08cf42 | 240 | |
3f241775 RW |
241 | return ret; |
242 | } | |
243 | ||
244 | /** | |
5063ce15 | 245 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
246 | * @genpd: PM domain to power up. |
247 | */ | |
248 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
249 | { | |
250 | int ret; | |
251 | ||
252 | mutex_lock(&genpd->lock); | |
253 | ret = __pm_genpd_poweron(genpd); | |
254 | mutex_unlock(&genpd->lock); | |
255 | return ret; | |
5248051b RW |
256 | } |
257 | ||
8e9afafd RW |
258 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
259 | { | |
260 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
261 | save_state_latency_ns, "state save"); | |
262 | } | |
263 | ||
ba2bbfbf UH |
264 | static int genpd_restore_dev(struct generic_pm_domain *genpd, |
265 | struct device *dev, bool timed) | |
8e9afafd | 266 | { |
ba2bbfbf UH |
267 | if (!timed) |
268 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); | |
269 | ||
8e9afafd RW |
270 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
271 | restore_state_latency_ns, | |
272 | "state restore"); | |
273 | } | |
274 | ||
6ff7bb0d RW |
275 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
276 | unsigned long val, void *ptr) | |
277 | { | |
278 | struct generic_pm_domain_data *gpd_data; | |
279 | struct device *dev; | |
280 | ||
281 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 282 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
283 | |
284 | for (;;) { | |
285 | struct generic_pm_domain *genpd; | |
286 | struct pm_domain_data *pdd; | |
287 | ||
288 | spin_lock_irq(&dev->power.lock); | |
289 | ||
290 | pdd = dev->power.subsys_data ? | |
291 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 292 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
293 | to_gpd_data(pdd)->td.constraint_changed = true; |
294 | genpd = dev_to_genpd(dev); | |
295 | } else { | |
296 | genpd = ERR_PTR(-ENODATA); | |
297 | } | |
298 | ||
299 | spin_unlock_irq(&dev->power.lock); | |
300 | ||
301 | if (!IS_ERR(genpd)) { | |
302 | mutex_lock(&genpd->lock); | |
303 | genpd->max_off_time_changed = true; | |
304 | mutex_unlock(&genpd->lock); | |
305 | } | |
306 | ||
307 | dev = dev->parent; | |
308 | if (!dev || dev->power.ignore_children) | |
309 | break; | |
310 | } | |
311 | ||
312 | return NOTIFY_DONE; | |
313 | } | |
314 | ||
f721889f RW |
315 | /** |
316 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
317 | * @genpd: PM domain to power down. | |
f96b3c4f | 318 | * @is_async: PM domain is powered down from a scheduled work |
f721889f RW |
319 | * |
320 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 321 | * have been powered down, remove power from @genpd. |
f721889f | 322 | */ |
f96b3c4f | 323 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) |
f721889f | 324 | { |
4605ab65 | 325 | struct pm_domain_data *pdd; |
5063ce15 | 326 | struct gpd_link *link; |
ba2bbfbf | 327 | unsigned int not_suspended = 0; |
f721889f | 328 | |
c6d22b37 RW |
329 | /* |
330 | * Do not try to power off the domain in the following situations: | |
331 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 332 | * (2) System suspend is in progress. |
c6d22b37 | 333 | */ |
3f241775 | 334 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 335 | || genpd->prepared_count > 0) |
f721889f RW |
336 | return 0; |
337 | ||
c4bb3160 | 338 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
339 | return -EBUSY; |
340 | ||
34b1f762 RW |
341 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
342 | enum pm_qos_flags_status stat; | |
343 | ||
344 | stat = dev_pm_qos_flags(pdd->dev, | |
345 | PM_QOS_FLAG_NO_POWER_OFF | |
346 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
347 | if (stat > PM_QOS_FLAGS_NONE) | |
348 | return -EBUSY; | |
349 | ||
0aa2a221 | 350 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 351 | || pdd->dev->power.irq_safe)) |
f721889f | 352 | not_suspended++; |
34b1f762 | 353 | } |
f721889f | 354 | |
f96b3c4f | 355 | if (not_suspended > 1 || (not_suspended == 1 && is_async)) |
f721889f RW |
356 | return -EBUSY; |
357 | ||
358 | if (genpd->gov && genpd->gov->power_down_ok) { | |
359 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
360 | return -EAGAIN; | |
361 | } | |
362 | ||
3c07cbc4 | 363 | if (genpd->power_off) { |
ba2bbfbf UH |
364 | int ret; |
365 | ||
366 | if (atomic_read(&genpd->sd_count) > 0) | |
367 | return -EBUSY; | |
17b75eca | 368 | |
3c07cbc4 | 369 | /* |
5063ce15 RW |
370 | * If sd_count > 0 at this point, one of the subdomains hasn't |
371 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
372 | * incrementing it. In that case pm_genpd_poweron() will wait |
373 | * for us to drop the lock, so we can call .power_off() and let | |
374 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
375 | * happen very often). | |
376 | */ | |
a4630c61 | 377 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
378 | if (ret) |
379 | return ret; | |
d2805402 | 380 | } |
f721889f | 381 | |
17b75eca | 382 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 383 | |
5063ce15 RW |
384 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
385 | genpd_sd_counter_dec(link->master); | |
386 | genpd_queue_power_off_work(link->master); | |
387 | } | |
f721889f | 388 | |
ba2bbfbf | 389 | return 0; |
f721889f RW |
390 | } |
391 | ||
392 | /** | |
393 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
394 | * @work: Work structure used for scheduling the execution of this function. | |
395 | */ | |
396 | static void genpd_power_off_work_fn(struct work_struct *work) | |
397 | { | |
398 | struct generic_pm_domain *genpd; | |
399 | ||
400 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
401 | ||
ba2bbfbf | 402 | mutex_lock(&genpd->lock); |
f96b3c4f | 403 | pm_genpd_poweroff(genpd, true); |
ba2bbfbf | 404 | mutex_unlock(&genpd->lock); |
f721889f RW |
405 | } |
406 | ||
407 | /** | |
408 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
409 | * @dev: Device to suspend. | |
410 | * | |
411 | * Carry out a runtime suspend of a device under the assumption that its | |
412 | * pm_domain field points to the domain member of an object of type | |
413 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
414 | */ | |
415 | static int pm_genpd_runtime_suspend(struct device *dev) | |
416 | { | |
417 | struct generic_pm_domain *genpd; | |
b02c999a | 418 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 419 | int ret; |
f721889f RW |
420 | |
421 | dev_dbg(dev, "%s()\n", __func__); | |
422 | ||
5248051b RW |
423 | genpd = dev_to_genpd(dev); |
424 | if (IS_ERR(genpd)) | |
f721889f RW |
425 | return -EINVAL; |
426 | ||
b02c999a RW |
427 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
428 | if (stop_ok && !stop_ok(dev)) | |
429 | return -EBUSY; | |
430 | ||
ba2bbfbf | 431 | ret = genpd_save_dev(genpd, dev); |
d5e4cbfe RW |
432 | if (ret) |
433 | return ret; | |
17b75eca | 434 | |
ba2bbfbf UH |
435 | ret = genpd_stop_dev(genpd, dev); |
436 | if (ret) { | |
437 | genpd_restore_dev(genpd, dev, true); | |
438 | return ret; | |
439 | } | |
440 | ||
0aa2a221 RW |
441 | /* |
442 | * If power.irq_safe is set, this routine will be run with interrupts | |
443 | * off, so it can't use mutexes. | |
444 | */ | |
445 | if (dev->power.irq_safe) | |
446 | return 0; | |
447 | ||
c6d22b37 | 448 | mutex_lock(&genpd->lock); |
f96b3c4f | 449 | pm_genpd_poweroff(genpd, false); |
c6d22b37 | 450 | mutex_unlock(&genpd->lock); |
f721889f RW |
451 | |
452 | return 0; | |
453 | } | |
454 | ||
f721889f RW |
455 | /** |
456 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
457 | * @dev: Device to resume. | |
458 | * | |
459 | * Carry out a runtime resume of a device under the assumption that its | |
460 | * pm_domain field points to the domain member of an object of type | |
461 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
462 | */ | |
463 | static int pm_genpd_runtime_resume(struct device *dev) | |
464 | { | |
465 | struct generic_pm_domain *genpd; | |
f721889f | 466 | int ret; |
ba2bbfbf | 467 | bool timed = true; |
f721889f RW |
468 | |
469 | dev_dbg(dev, "%s()\n", __func__); | |
470 | ||
5248051b RW |
471 | genpd = dev_to_genpd(dev); |
472 | if (IS_ERR(genpd)) | |
f721889f RW |
473 | return -EINVAL; |
474 | ||
0aa2a221 | 475 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
476 | if (dev->power.irq_safe) { |
477 | timed = false; | |
478 | goto out; | |
479 | } | |
0aa2a221 | 480 | |
c6d22b37 | 481 | mutex_lock(&genpd->lock); |
3f241775 | 482 | ret = __pm_genpd_poweron(genpd); |
ba2bbfbf | 483 | mutex_unlock(&genpd->lock); |
c6d22b37 | 484 | |
ba2bbfbf UH |
485 | if (ret) |
486 | return ret; | |
c6d22b37 | 487 | |
ba2bbfbf UH |
488 | out: |
489 | genpd_start_dev(genpd, dev, timed); | |
490 | genpd_restore_dev(genpd, dev, timed); | |
17b75eca | 491 | |
f721889f RW |
492 | return 0; |
493 | } | |
494 | ||
39ac5ba5 TB |
495 | static bool pd_ignore_unused; |
496 | static int __init pd_ignore_unused_setup(char *__unused) | |
497 | { | |
498 | pd_ignore_unused = true; | |
499 | return 1; | |
500 | } | |
501 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
502 | ||
17f2ae7f RW |
503 | /** |
504 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
505 | */ | |
506 | void pm_genpd_poweroff_unused(void) | |
507 | { | |
508 | struct generic_pm_domain *genpd; | |
509 | ||
39ac5ba5 TB |
510 | if (pd_ignore_unused) { |
511 | pr_warn("genpd: Not disabling unused power domains\n"); | |
512 | return; | |
513 | } | |
514 | ||
17f2ae7f RW |
515 | mutex_lock(&gpd_list_lock); |
516 | ||
517 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
518 | genpd_queue_power_off_work(genpd); | |
519 | ||
520 | mutex_unlock(&gpd_list_lock); | |
521 | } | |
522 | ||
2fe71dcd UH |
523 | static int __init genpd_poweroff_unused(void) |
524 | { | |
525 | pm_genpd_poweroff_unused(); | |
526 | return 0; | |
527 | } | |
528 | late_initcall(genpd_poweroff_unused); | |
529 | ||
596ba34b RW |
530 | #ifdef CONFIG_PM_SLEEP |
531 | ||
77f827de RW |
532 | /** |
533 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
534 | * @genpd: PM domain to check. | |
535 | */ | |
895b31f3 | 536 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 537 | { |
895b31f3 | 538 | const struct generic_pm_domain *gpd; |
77f827de RW |
539 | |
540 | if (IS_ERR_OR_NULL(genpd)) | |
541 | return false; | |
542 | ||
543 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
544 | if (gpd == genpd) | |
545 | return true; | |
546 | ||
547 | return false; | |
548 | } | |
549 | ||
d5e4cbfe RW |
550 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
551 | struct device *dev) | |
552 | { | |
553 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
554 | } | |
555 | ||
596ba34b | 556 | /** |
5063ce15 | 557 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 558 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 559 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
560 | * |
561 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 562 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 563 | * |
77f827de RW |
564 | * This function is only called in "noirq" and "syscore" stages of system power |
565 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
566 | * executed sequentially, so it is guaranteed that it will never run twice in | |
567 | * parallel). | |
596ba34b | 568 | */ |
a4630c61 GU |
569 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
570 | bool timed) | |
596ba34b | 571 | { |
5063ce15 | 572 | struct gpd_link *link; |
596ba34b | 573 | |
17b75eca | 574 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
575 | return; |
576 | ||
c4bb3160 RW |
577 | if (genpd->suspended_count != genpd->device_count |
578 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
579 | return; |
580 | ||
a4630c61 | 581 | genpd_power_off(genpd, timed); |
596ba34b | 582 | |
17b75eca | 583 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
584 | |
585 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
586 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 587 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
588 | } |
589 | } | |
590 | ||
802d8b49 RW |
591 | /** |
592 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
593 | * @genpd: PM domain to power on. | |
a4630c61 | 594 | * @timed: True if latency measurements are allowed. |
802d8b49 | 595 | * |
77f827de RW |
596 | * This function is only called in "noirq" and "syscore" stages of system power |
597 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
598 | * executed sequentially, so it is guaranteed that it will never run twice in | |
599 | * parallel). | |
802d8b49 | 600 | */ |
a4630c61 GU |
601 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
602 | bool timed) | |
802d8b49 RW |
603 | { |
604 | struct gpd_link *link; | |
605 | ||
ba2bbfbf | 606 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
607 | return; |
608 | ||
609 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 610 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
611 | genpd_sd_counter_inc(link->master); |
612 | } | |
613 | ||
a4630c61 | 614 | genpd_power_on(genpd, timed); |
802d8b49 RW |
615 | |
616 | genpd->status = GPD_STATE_ACTIVE; | |
617 | } | |
618 | ||
4ecd6e65 RW |
619 | /** |
620 | * resume_needed - Check whether to resume a device before system suspend. | |
621 | * @dev: Device to check. | |
622 | * @genpd: PM domain the device belongs to. | |
623 | * | |
624 | * There are two cases in which a device that can wake up the system from sleep | |
625 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
626 | * to wake up the system and it has to remain active for this purpose while the | |
627 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
628 | * the system from sleep states and it generally doesn't generate wakeup signals | |
629 | * by itself (those signals are generated on its behalf by other parts of the | |
630 | * system). In the latter case it may be necessary to reconfigure the device's | |
631 | * wakeup settings during system suspend, because it may have been set up to | |
632 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
633 | * Return 'true' in either of the above cases. | |
634 | */ | |
635 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
636 | { | |
637 | bool active_wakeup; | |
638 | ||
639 | if (!device_can_wakeup(dev)) | |
640 | return false; | |
641 | ||
d5e4cbfe | 642 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
643 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
644 | } | |
645 | ||
596ba34b RW |
646 | /** |
647 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
648 | * @dev: Device to start the transition of. | |
649 | * | |
650 | * Start a power transition of a device (during a system-wide power transition) | |
651 | * under the assumption that its pm_domain field points to the domain member of | |
652 | * an object of type struct generic_pm_domain representing a PM domain | |
653 | * consisting of I/O devices. | |
654 | */ | |
655 | static int pm_genpd_prepare(struct device *dev) | |
656 | { | |
657 | struct generic_pm_domain *genpd; | |
b6c10c84 | 658 | int ret; |
596ba34b RW |
659 | |
660 | dev_dbg(dev, "%s()\n", __func__); | |
661 | ||
662 | genpd = dev_to_genpd(dev); | |
663 | if (IS_ERR(genpd)) | |
664 | return -EINVAL; | |
665 | ||
17b75eca RW |
666 | /* |
667 | * If a wakeup request is pending for the device, it should be woken up | |
668 | * at this point and a system wakeup event should be reported if it's | |
669 | * set up to wake up the system from sleep states. | |
670 | */ | |
671 | pm_runtime_get_noresume(dev); | |
672 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
673 | pm_wakeup_event(dev, 0); | |
674 | ||
675 | if (pm_wakeup_pending()) { | |
84167035 | 676 | pm_runtime_put(dev); |
17b75eca RW |
677 | return -EBUSY; |
678 | } | |
679 | ||
4ecd6e65 RW |
680 | if (resume_needed(dev, genpd)) |
681 | pm_runtime_resume(dev); | |
682 | ||
ba2bbfbf | 683 | mutex_lock(&genpd->lock); |
596ba34b | 684 | |
65533bbf RW |
685 | if (genpd->prepared_count++ == 0) { |
686 | genpd->suspended_count = 0; | |
17b75eca | 687 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 688 | } |
17b75eca | 689 | |
ba2bbfbf | 690 | mutex_unlock(&genpd->lock); |
596ba34b RW |
691 | |
692 | if (genpd->suspend_power_off) { | |
17b75eca | 693 | pm_runtime_put_noidle(dev); |
596ba34b RW |
694 | return 0; |
695 | } | |
696 | ||
697 | /* | |
17b75eca RW |
698 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
699 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 700 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 701 | * to make it operational. |
596ba34b | 702 | */ |
17b75eca | 703 | pm_runtime_resume(dev); |
596ba34b RW |
704 | __pm_runtime_disable(dev, false); |
705 | ||
b6c10c84 RW |
706 | ret = pm_generic_prepare(dev); |
707 | if (ret) { | |
708 | mutex_lock(&genpd->lock); | |
709 | ||
710 | if (--genpd->prepared_count == 0) | |
711 | genpd->suspend_power_off = false; | |
712 | ||
713 | mutex_unlock(&genpd->lock); | |
17b75eca | 714 | pm_runtime_enable(dev); |
b6c10c84 | 715 | } |
17b75eca | 716 | |
84167035 | 717 | pm_runtime_put(dev); |
b6c10c84 | 718 | return ret; |
596ba34b RW |
719 | } |
720 | ||
721 | /** | |
722 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
723 | * @dev: Device to suspend. | |
724 | * | |
725 | * Suspend a device under the assumption that its pm_domain field points to the | |
726 | * domain member of an object of type struct generic_pm_domain representing | |
727 | * a PM domain consisting of I/O devices. | |
728 | */ | |
729 | static int pm_genpd_suspend(struct device *dev) | |
730 | { | |
731 | struct generic_pm_domain *genpd; | |
732 | ||
733 | dev_dbg(dev, "%s()\n", __func__); | |
734 | ||
735 | genpd = dev_to_genpd(dev); | |
736 | if (IS_ERR(genpd)) | |
737 | return -EINVAL; | |
738 | ||
1e0407ca | 739 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
740 | } |
741 | ||
742 | /** | |
0496c8ae | 743 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
744 | * @dev: Device to suspend. |
745 | * | |
746 | * Carry out a late suspend of a device under the assumption that its | |
747 | * pm_domain field points to the domain member of an object of type | |
748 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
749 | */ | |
0496c8ae | 750 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
751 | { |
752 | struct generic_pm_domain *genpd; | |
596ba34b RW |
753 | |
754 | dev_dbg(dev, "%s()\n", __func__); | |
755 | ||
756 | genpd = dev_to_genpd(dev); | |
757 | if (IS_ERR(genpd)) | |
758 | return -EINVAL; | |
759 | ||
1e0407ca | 760 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 761 | } |
596ba34b | 762 | |
0496c8ae RW |
763 | /** |
764 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
765 | * @dev: Device to suspend. | |
766 | * | |
767 | * Stop the device and remove power from the domain if all devices in it have | |
768 | * been stopped. | |
769 | */ | |
770 | static int pm_genpd_suspend_noirq(struct device *dev) | |
771 | { | |
772 | struct generic_pm_domain *genpd; | |
773 | ||
774 | dev_dbg(dev, "%s()\n", __func__); | |
775 | ||
776 | genpd = dev_to_genpd(dev); | |
777 | if (IS_ERR(genpd)) | |
778 | return -EINVAL; | |
596ba34b | 779 | |
dbf37414 | 780 | if (genpd->suspend_power_off |
0496c8ae | 781 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
782 | return 0; |
783 | ||
d5e4cbfe | 784 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
785 | |
786 | /* | |
787 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
788 | * guaranteed that this function will never run twice in parallel for | |
789 | * the same PM domain, so it is not necessary to use locking here. | |
790 | */ | |
791 | genpd->suspended_count++; | |
a4630c61 | 792 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
793 | |
794 | return 0; | |
795 | } | |
796 | ||
797 | /** | |
0496c8ae | 798 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
799 | * @dev: Device to resume. |
800 | * | |
0496c8ae | 801 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
802 | */ |
803 | static int pm_genpd_resume_noirq(struct device *dev) | |
804 | { | |
805 | struct generic_pm_domain *genpd; | |
806 | ||
807 | dev_dbg(dev, "%s()\n", __func__); | |
808 | ||
809 | genpd = dev_to_genpd(dev); | |
810 | if (IS_ERR(genpd)) | |
811 | return -EINVAL; | |
812 | ||
dbf37414 | 813 | if (genpd->suspend_power_off |
cc85b207 | 814 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
815 | return 0; |
816 | ||
817 | /* | |
818 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
819 | * guaranteed that this function will never run twice in parallel for | |
820 | * the same PM domain, so it is not necessary to use locking here. | |
821 | */ | |
a4630c61 | 822 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 823 | genpd->suspended_count--; |
596ba34b | 824 | |
ba2bbfbf | 825 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
826 | } |
827 | ||
828 | /** | |
0496c8ae RW |
829 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
830 | * @dev: Device to resume. | |
831 | * | |
832 | * Carry out an early resume of a device under the assumption that its | |
833 | * pm_domain field points to the domain member of an object of type | |
834 | * struct generic_pm_domain representing a power domain consisting of I/O | |
835 | * devices. | |
836 | */ | |
837 | static int pm_genpd_resume_early(struct device *dev) | |
838 | { | |
839 | struct generic_pm_domain *genpd; | |
840 | ||
841 | dev_dbg(dev, "%s()\n", __func__); | |
842 | ||
843 | genpd = dev_to_genpd(dev); | |
844 | if (IS_ERR(genpd)) | |
845 | return -EINVAL; | |
846 | ||
1e0407ca | 847 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
848 | } |
849 | ||
850 | /** | |
851 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
852 | * @dev: Device to resume. |
853 | * | |
854 | * Resume a device under the assumption that its pm_domain field points to the | |
855 | * domain member of an object of type struct generic_pm_domain representing | |
856 | * a power domain consisting of I/O devices. | |
857 | */ | |
858 | static int pm_genpd_resume(struct device *dev) | |
859 | { | |
860 | struct generic_pm_domain *genpd; | |
861 | ||
862 | dev_dbg(dev, "%s()\n", __func__); | |
863 | ||
864 | genpd = dev_to_genpd(dev); | |
865 | if (IS_ERR(genpd)) | |
866 | return -EINVAL; | |
867 | ||
1e0407ca | 868 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
869 | } |
870 | ||
871 | /** | |
0496c8ae | 872 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
873 | * @dev: Device to freeze. |
874 | * | |
875 | * Freeze a device under the assumption that its pm_domain field points to the | |
876 | * domain member of an object of type struct generic_pm_domain representing | |
877 | * a power domain consisting of I/O devices. | |
878 | */ | |
879 | static int pm_genpd_freeze(struct device *dev) | |
880 | { | |
881 | struct generic_pm_domain *genpd; | |
882 | ||
883 | dev_dbg(dev, "%s()\n", __func__); | |
884 | ||
885 | genpd = dev_to_genpd(dev); | |
886 | if (IS_ERR(genpd)) | |
887 | return -EINVAL; | |
888 | ||
1e0407ca | 889 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
890 | } |
891 | ||
892 | /** | |
0496c8ae RW |
893 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
894 | * @dev: Device to freeze. | |
895 | * | |
896 | * Carry out a late freeze of a device under the assumption that its | |
897 | * pm_domain field points to the domain member of an object of type | |
898 | * struct generic_pm_domain representing a power domain consisting of I/O | |
899 | * devices. | |
900 | */ | |
901 | static int pm_genpd_freeze_late(struct device *dev) | |
902 | { | |
903 | struct generic_pm_domain *genpd; | |
904 | ||
905 | dev_dbg(dev, "%s()\n", __func__); | |
906 | ||
907 | genpd = dev_to_genpd(dev); | |
908 | if (IS_ERR(genpd)) | |
909 | return -EINVAL; | |
910 | ||
1e0407ca | 911 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
912 | } |
913 | ||
914 | /** | |
915 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
916 | * @dev: Device to freeze. |
917 | * | |
918 | * Carry out a late freeze of a device under the assumption that its | |
919 | * pm_domain field points to the domain member of an object of type | |
920 | * struct generic_pm_domain representing a power domain consisting of I/O | |
921 | * devices. | |
922 | */ | |
923 | static int pm_genpd_freeze_noirq(struct device *dev) | |
924 | { | |
925 | struct generic_pm_domain *genpd; | |
596ba34b RW |
926 | |
927 | dev_dbg(dev, "%s()\n", __func__); | |
928 | ||
929 | genpd = dev_to_genpd(dev); | |
930 | if (IS_ERR(genpd)) | |
931 | return -EINVAL; | |
932 | ||
dbf37414 | 933 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 934 | } |
596ba34b | 935 | |
0496c8ae RW |
936 | /** |
937 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
938 | * @dev: Device to thaw. | |
939 | * | |
940 | * Start the device, unless power has been removed from the domain already | |
941 | * before the system transition. | |
942 | */ | |
943 | static int pm_genpd_thaw_noirq(struct device *dev) | |
944 | { | |
945 | struct generic_pm_domain *genpd; | |
596ba34b | 946 | |
0496c8ae | 947 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 948 | |
0496c8ae RW |
949 | genpd = dev_to_genpd(dev); |
950 | if (IS_ERR(genpd)) | |
951 | return -EINVAL; | |
952 | ||
ba2bbfbf | 953 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev, true); |
596ba34b RW |
954 | } |
955 | ||
956 | /** | |
0496c8ae | 957 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
958 | * @dev: Device to thaw. |
959 | * | |
960 | * Carry out an early thaw of a device under the assumption that its | |
961 | * pm_domain field points to the domain member of an object of type | |
962 | * struct generic_pm_domain representing a power domain consisting of I/O | |
963 | * devices. | |
964 | */ | |
0496c8ae | 965 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
966 | { |
967 | struct generic_pm_domain *genpd; | |
968 | ||
969 | dev_dbg(dev, "%s()\n", __func__); | |
970 | ||
971 | genpd = dev_to_genpd(dev); | |
972 | if (IS_ERR(genpd)) | |
973 | return -EINVAL; | |
974 | ||
1e0407ca | 975 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
976 | } |
977 | ||
978 | /** | |
979 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
980 | * @dev: Device to thaw. | |
981 | * | |
982 | * Thaw a device under the assumption that its pm_domain field points to the | |
983 | * domain member of an object of type struct generic_pm_domain representing | |
984 | * a power domain consisting of I/O devices. | |
985 | */ | |
986 | static int pm_genpd_thaw(struct device *dev) | |
987 | { | |
988 | struct generic_pm_domain *genpd; | |
989 | ||
990 | dev_dbg(dev, "%s()\n", __func__); | |
991 | ||
992 | genpd = dev_to_genpd(dev); | |
993 | if (IS_ERR(genpd)) | |
994 | return -EINVAL; | |
995 | ||
1e0407ca | 996 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
997 | } |
998 | ||
999 | /** | |
0496c8ae | 1000 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1001 | * @dev: Device to resume. |
1002 | * | |
0496c8ae RW |
1003 | * Make sure the domain will be in the same power state as before the |
1004 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1005 | */ |
1006 | static int pm_genpd_restore_noirq(struct device *dev) | |
1007 | { | |
1008 | struct generic_pm_domain *genpd; | |
1009 | ||
1010 | dev_dbg(dev, "%s()\n", __func__); | |
1011 | ||
1012 | genpd = dev_to_genpd(dev); | |
1013 | if (IS_ERR(genpd)) | |
1014 | return -EINVAL; | |
1015 | ||
1016 | /* | |
1017 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1018 | * guaranteed that this function will never run twice in parallel for | |
1019 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1020 | * |
1021 | * At this point suspended_count == 0 means we are being run for the | |
1022 | * first time for the given domain in the present cycle. | |
596ba34b | 1023 | */ |
65533bbf | 1024 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1025 | /* |
65533bbf | 1026 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1027 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1028 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1029 | */ |
65533bbf RW |
1030 | genpd->status = GPD_STATE_POWER_OFF; |
1031 | if (genpd->suspend_power_off) { | |
1032 | /* | |
1033 | * If the domain was off before the hibernation, make | |
1034 | * sure it will be off going forward. | |
1035 | */ | |
a4630c61 | 1036 | genpd_power_off(genpd, true); |
65533bbf RW |
1037 | |
1038 | return 0; | |
1039 | } | |
596ba34b RW |
1040 | } |
1041 | ||
18dd2ece RW |
1042 | if (genpd->suspend_power_off) |
1043 | return 0; | |
1044 | ||
a4630c61 | 1045 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 1046 | |
ba2bbfbf | 1047 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
1048 | } |
1049 | ||
1050 | /** | |
1051 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1052 | * @dev: Device to complete the transition of. | |
1053 | * | |
1054 | * Complete a power transition of a device (during a system-wide power | |
1055 | * transition) under the assumption that its pm_domain field points to the | |
1056 | * domain member of an object of type struct generic_pm_domain representing | |
1057 | * a power domain consisting of I/O devices. | |
1058 | */ | |
1059 | static void pm_genpd_complete(struct device *dev) | |
1060 | { | |
1061 | struct generic_pm_domain *genpd; | |
1062 | bool run_complete; | |
1063 | ||
1064 | dev_dbg(dev, "%s()\n", __func__); | |
1065 | ||
1066 | genpd = dev_to_genpd(dev); | |
1067 | if (IS_ERR(genpd)) | |
1068 | return; | |
1069 | ||
1070 | mutex_lock(&genpd->lock); | |
1071 | ||
1072 | run_complete = !genpd->suspend_power_off; | |
1073 | if (--genpd->prepared_count == 0) | |
1074 | genpd->suspend_power_off = false; | |
1075 | ||
1076 | mutex_unlock(&genpd->lock); | |
1077 | ||
1078 | if (run_complete) { | |
1079 | pm_generic_complete(dev); | |
6f00ff78 | 1080 | pm_runtime_set_active(dev); |
596ba34b | 1081 | pm_runtime_enable(dev); |
af939339 | 1082 | pm_request_idle(dev); |
596ba34b RW |
1083 | } |
1084 | } | |
1085 | ||
77f827de | 1086 | /** |
d47e6464 | 1087 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1088 | * @dev: Device that normally is marked as "always on" to switch power for. |
1089 | * | |
1090 | * This routine may only be called during the system core (syscore) suspend or | |
1091 | * resume phase for devices whose "always on" flags are set. | |
1092 | */ | |
d47e6464 | 1093 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1094 | { |
1095 | struct generic_pm_domain *genpd; | |
1096 | ||
1097 | genpd = dev_to_genpd(dev); | |
1098 | if (!pm_genpd_present(genpd)) | |
1099 | return; | |
1100 | ||
1101 | if (suspend) { | |
1102 | genpd->suspended_count++; | |
a4630c61 | 1103 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 1104 | } else { |
a4630c61 | 1105 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
1106 | genpd->suspended_count--; |
1107 | } | |
1108 | } | |
d47e6464 UH |
1109 | |
1110 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1111 | { | |
1112 | genpd_syscore_switch(dev, true); | |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1115 | ||
1116 | void pm_genpd_syscore_poweron(struct device *dev) | |
1117 | { | |
1118 | genpd_syscore_switch(dev, false); | |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1121 | |
d30d819d | 1122 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1123 | |
1124 | #define pm_genpd_prepare NULL | |
1125 | #define pm_genpd_suspend NULL | |
0496c8ae | 1126 | #define pm_genpd_suspend_late NULL |
596ba34b | 1127 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1128 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1129 | #define pm_genpd_resume_noirq NULL |
1130 | #define pm_genpd_resume NULL | |
1131 | #define pm_genpd_freeze NULL | |
0496c8ae | 1132 | #define pm_genpd_freeze_late NULL |
596ba34b | 1133 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1134 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1135 | #define pm_genpd_thaw_noirq NULL |
1136 | #define pm_genpd_thaw NULL | |
596ba34b | 1137 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1138 | #define pm_genpd_complete NULL |
1139 | ||
1140 | #endif /* CONFIG_PM_SLEEP */ | |
1141 | ||
f104e1e5 UH |
1142 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1143 | struct generic_pm_domain *genpd, | |
1144 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1145 | { |
1146 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1147 | int ret; |
1148 | ||
1149 | ret = dev_pm_get_subsys_data(dev); | |
1150 | if (ret) | |
1151 | return ERR_PTR(ret); | |
1d5fcfec RW |
1152 | |
1153 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1154 | if (!gpd_data) { |
1155 | ret = -ENOMEM; | |
1156 | goto err_put; | |
1157 | } | |
1d5fcfec | 1158 | |
f104e1e5 UH |
1159 | if (td) |
1160 | gpd_data->td = *td; | |
1161 | ||
1162 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1163 | gpd_data->td.constraint_changed = true; |
1164 | gpd_data->td.effective_constraint_ns = -1; | |
1165 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1166 | ||
1167 | spin_lock_irq(&dev->power.lock); | |
1168 | ||
1169 | if (dev->power.subsys_data->domain_data) { | |
1170 | ret = -EINVAL; | |
1171 | goto err_free; | |
1172 | } | |
1173 | ||
1174 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1175 | dev->pm_domain = &genpd->domain; | |
1176 | ||
1177 | spin_unlock_irq(&dev->power.lock); | |
1178 | ||
1d5fcfec | 1179 | return gpd_data; |
3e235685 | 1180 | |
f104e1e5 UH |
1181 | err_free: |
1182 | spin_unlock_irq(&dev->power.lock); | |
1183 | kfree(gpd_data); | |
3e235685 UH |
1184 | err_put: |
1185 | dev_pm_put_subsys_data(dev); | |
1186 | return ERR_PTR(ret); | |
1d5fcfec RW |
1187 | } |
1188 | ||
49d400c7 UH |
1189 | static void genpd_free_dev_data(struct device *dev, |
1190 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1191 | { |
f104e1e5 UH |
1192 | spin_lock_irq(&dev->power.lock); |
1193 | ||
1194 | dev->pm_domain = NULL; | |
1195 | dev->power.subsys_data->domain_data = NULL; | |
1196 | ||
1197 | spin_unlock_irq(&dev->power.lock); | |
1198 | ||
1d5fcfec | 1199 | kfree(gpd_data); |
3e235685 | 1200 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1201 | } |
1202 | ||
f721889f | 1203 | /** |
b02c999a | 1204 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1205 | * @genpd: PM domain to add the device to. |
1206 | * @dev: Device to be added. | |
b02c999a | 1207 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1208 | */ |
b02c999a RW |
1209 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1210 | struct gpd_timing_data *td) | |
f721889f | 1211 | { |
c0356db7 | 1212 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1213 | int ret = 0; |
1214 | ||
1215 | dev_dbg(dev, "%s()\n", __func__); | |
1216 | ||
1217 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1218 | return -EINVAL; | |
1219 | ||
f104e1e5 | 1220 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1221 | if (IS_ERR(gpd_data)) |
1222 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1223 | |
ba2bbfbf | 1224 | mutex_lock(&genpd->lock); |
f721889f | 1225 | |
596ba34b RW |
1226 | if (genpd->prepared_count > 0) { |
1227 | ret = -EAGAIN; | |
1228 | goto out; | |
1229 | } | |
1230 | ||
b472c2fa UH |
1231 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1232 | if (ret) | |
1233 | goto out; | |
d79b6fe1 | 1234 | |
14b53064 UH |
1235 | genpd->device_count++; |
1236 | genpd->max_off_time_changed = true; | |
1237 | ||
1d5fcfec | 1238 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1239 | |
f721889f | 1240 | out: |
ba2bbfbf | 1241 | mutex_unlock(&genpd->lock); |
f721889f | 1242 | |
c0356db7 UH |
1243 | if (ret) |
1244 | genpd_free_dev_data(dev, gpd_data); | |
1245 | else | |
1246 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1247 | |
f721889f RW |
1248 | return ret; |
1249 | } | |
1250 | ||
1251 | /** | |
1252 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1253 | * @genpd: PM domain to remove the device from. | |
1254 | * @dev: Device to be removed. | |
1255 | */ | |
1256 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1257 | struct device *dev) | |
1258 | { | |
6ff7bb0d | 1259 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1260 | struct pm_domain_data *pdd; |
efa69025 | 1261 | int ret = 0; |
f721889f RW |
1262 | |
1263 | dev_dbg(dev, "%s()\n", __func__); | |
1264 | ||
df6a0d6f | 1265 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1266 | return -EINVAL; |
1267 | ||
c0356db7 UH |
1268 | /* The above validation also means we have existing domain_data. */ |
1269 | pdd = dev->power.subsys_data->domain_data; | |
1270 | gpd_data = to_gpd_data(pdd); | |
1271 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1272 | ||
ba2bbfbf | 1273 | mutex_lock(&genpd->lock); |
f721889f | 1274 | |
596ba34b RW |
1275 | if (genpd->prepared_count > 0) { |
1276 | ret = -EAGAIN; | |
1277 | goto out; | |
1278 | } | |
1279 | ||
6ff7bb0d RW |
1280 | genpd->device_count--; |
1281 | genpd->max_off_time_changed = true; | |
1282 | ||
d79b6fe1 | 1283 | if (genpd->detach_dev) |
c16561e8 | 1284 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1285 | |
efa69025 | 1286 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1287 | |
ba2bbfbf | 1288 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1289 | |
c1dbe2fb | 1290 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1291 | |
6ff7bb0d | 1292 | return 0; |
f721889f | 1293 | |
596ba34b | 1294 | out: |
ba2bbfbf | 1295 | mutex_unlock(&genpd->lock); |
c0356db7 | 1296 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1297 | |
1298 | return ret; | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1303 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1304 | * @subdomain: Subdomain to be added. |
f721889f RW |
1305 | */ |
1306 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1307 | struct generic_pm_domain *subdomain) |
f721889f | 1308 | { |
5063ce15 | 1309 | struct gpd_link *link; |
f721889f RW |
1310 | int ret = 0; |
1311 | ||
fb7268be RW |
1312 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1313 | || genpd == subdomain) | |
f721889f RW |
1314 | return -EINVAL; |
1315 | ||
ba2bbfbf | 1316 | mutex_lock(&genpd->lock); |
bc0403ff | 1317 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1318 | |
17b75eca | 1319 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1320 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1321 | ret = -EINVAL; |
1322 | goto out; | |
1323 | } | |
1324 | ||
4fcac10d | 1325 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1326 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1327 | ret = -EINVAL; |
1328 | goto out; | |
1329 | } | |
1330 | } | |
1331 | ||
5063ce15 RW |
1332 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1333 | if (!link) { | |
1334 | ret = -ENOMEM; | |
1335 | goto out; | |
1336 | } | |
1337 | link->master = genpd; | |
1338 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1339 | link->slave = subdomain; |
1340 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1341 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1342 | genpd_sd_counter_inc(genpd); |
f721889f | 1343 | |
f721889f | 1344 | out: |
bc0403ff | 1345 | mutex_unlock(&subdomain->lock); |
ba2bbfbf | 1346 | mutex_unlock(&genpd->lock); |
f721889f RW |
1347 | |
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | /** | |
1352 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1353 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1354 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1355 | */ |
1356 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1357 | struct generic_pm_domain *subdomain) |
f721889f | 1358 | { |
5063ce15 | 1359 | struct gpd_link *link; |
f721889f RW |
1360 | int ret = -EINVAL; |
1361 | ||
5063ce15 | 1362 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1363 | return -EINVAL; |
1364 | ||
ba2bbfbf | 1365 | mutex_lock(&genpd->lock); |
f721889f | 1366 | |
30e7a65b JH |
1367 | if (!list_empty(&subdomain->slave_links) || subdomain->device_count) { |
1368 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, | |
1369 | subdomain->name); | |
1370 | ret = -EBUSY; | |
1371 | goto out; | |
1372 | } | |
1373 | ||
5063ce15 RW |
1374 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1375 | if (link->slave != subdomain) | |
f721889f RW |
1376 | continue; |
1377 | ||
1378 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1379 | ||
5063ce15 RW |
1380 | list_del(&link->master_node); |
1381 | list_del(&link->slave_node); | |
1382 | kfree(link); | |
17b75eca | 1383 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1384 | genpd_sd_counter_dec(genpd); |
1385 | ||
1386 | mutex_unlock(&subdomain->lock); | |
1387 | ||
1388 | ret = 0; | |
1389 | break; | |
1390 | } | |
1391 | ||
30e7a65b | 1392 | out: |
ba2bbfbf | 1393 | mutex_unlock(&genpd->lock); |
f721889f RW |
1394 | |
1395 | return ret; | |
1396 | } | |
1397 | ||
d23b9b00 RW |
1398 | /* Default device callbacks for generic PM domains. */ |
1399 | ||
ecf00475 | 1400 | /** |
12e10bb6 | 1401 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1402 | * @dev: Device to handle. |
1403 | */ | |
1404 | static int pm_genpd_default_save_state(struct device *dev) | |
1405 | { | |
1406 | int (*cb)(struct device *__dev); | |
ecf00475 | 1407 | |
0b589741 RW |
1408 | if (dev->type && dev->type->pm) |
1409 | cb = dev->type->pm->runtime_suspend; | |
1410 | else if (dev->class && dev->class->pm) | |
1411 | cb = dev->class->pm->runtime_suspend; | |
1412 | else if (dev->bus && dev->bus->pm) | |
1413 | cb = dev->bus->pm->runtime_suspend; | |
1414 | else | |
1415 | cb = NULL; | |
ecf00475 | 1416 | |
0b589741 RW |
1417 | if (!cb && dev->driver && dev->driver->pm) |
1418 | cb = dev->driver->pm->runtime_suspend; | |
1419 | ||
1420 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1421 | } |
1422 | ||
1423 | /** | |
12e10bb6 | 1424 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1425 | * @dev: Device to handle. |
1426 | */ | |
1427 | static int pm_genpd_default_restore_state(struct device *dev) | |
1428 | { | |
1429 | int (*cb)(struct device *__dev); | |
ecf00475 | 1430 | |
0b589741 RW |
1431 | if (dev->type && dev->type->pm) |
1432 | cb = dev->type->pm->runtime_resume; | |
1433 | else if (dev->class && dev->class->pm) | |
1434 | cb = dev->class->pm->runtime_resume; | |
1435 | else if (dev->bus && dev->bus->pm) | |
1436 | cb = dev->bus->pm->runtime_resume; | |
1437 | else | |
1438 | cb = NULL; | |
ecf00475 | 1439 | |
0b589741 RW |
1440 | if (!cb && dev->driver && dev->driver->pm) |
1441 | cb = dev->driver->pm->runtime_resume; | |
1442 | ||
1443 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1444 | } |
1445 | ||
f721889f RW |
1446 | /** |
1447 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1448 | * @genpd: PM domain object to initialize. | |
1449 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1450 | * @is_off: Initial value of the domain's power_is_off field. | |
1451 | */ | |
1452 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1453 | struct dev_power_governor *gov, bool is_off) | |
1454 | { | |
1455 | if (IS_ERR_OR_NULL(genpd)) | |
1456 | return; | |
1457 | ||
5063ce15 RW |
1458 | INIT_LIST_HEAD(&genpd->master_links); |
1459 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1460 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1461 | mutex_init(&genpd->lock); |
1462 | genpd->gov = gov; | |
1463 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1464 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1465 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1466 | genpd->device_count = 0; |
221e9b58 | 1467 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1468 | genpd->max_off_time_changed = true; |
f721889f RW |
1469 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1470 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1471 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1472 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1473 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1474 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1475 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1476 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1477 | genpd->domain.ops.resume = pm_genpd_resume; |
1478 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1479 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1480 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1481 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1482 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1483 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1484 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1485 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1486 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1487 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1488 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1489 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1490 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1491 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1492 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1493 | |
1494 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1495 | genpd->dev_ops.stop = pm_clk_suspend; | |
1496 | genpd->dev_ops.start = pm_clk_resume; | |
1497 | } | |
1498 | ||
5125bbf3 RW |
1499 | mutex_lock(&gpd_list_lock); |
1500 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1501 | mutex_unlock(&gpd_list_lock); | |
1502 | } | |
be5ed55d | 1503 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1504 | |
1505 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1506 | /* | |
1507 | * Device Tree based PM domain providers. | |
1508 | * | |
1509 | * The code below implements generic device tree based PM domain providers that | |
1510 | * bind device tree nodes with generic PM domains registered in the system. | |
1511 | * | |
1512 | * Any driver that registers generic PM domains and needs to support binding of | |
1513 | * devices to these domains is supposed to register a PM domain provider, which | |
1514 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1515 | * | |
1516 | * Two simple mapping functions have been provided for convenience: | |
1517 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1518 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1519 | * index. | |
1520 | */ | |
1521 | ||
1522 | /** | |
1523 | * struct of_genpd_provider - PM domain provider registration structure | |
1524 | * @link: Entry in global list of PM domain providers | |
1525 | * @node: Pointer to device tree node of PM domain provider | |
1526 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1527 | * into a PM domain. | |
1528 | * @data: context pointer to be passed into @xlate callback | |
1529 | */ | |
1530 | struct of_genpd_provider { | |
1531 | struct list_head link; | |
1532 | struct device_node *node; | |
1533 | genpd_xlate_t xlate; | |
1534 | void *data; | |
1535 | }; | |
1536 | ||
1537 | /* List of registered PM domain providers. */ | |
1538 | static LIST_HEAD(of_genpd_providers); | |
1539 | /* Mutex to protect the list above. */ | |
1540 | static DEFINE_MUTEX(of_genpd_mutex); | |
1541 | ||
1542 | /** | |
1543 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1544 | * @genpdspec: OF phandle args to map into a PM domain | |
1545 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1546 | * | |
1547 | * This is a generic xlate function that can be used to model PM domains that | |
1548 | * have their own device tree nodes. The private data of xlate function needs | |
1549 | * to be a valid pointer to struct generic_pm_domain. | |
1550 | */ | |
1551 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1552 | struct of_phandle_args *genpdspec, | |
1553 | void *data) | |
1554 | { | |
1555 | if (genpdspec->args_count != 0) | |
1556 | return ERR_PTR(-EINVAL); | |
1557 | return data; | |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1560 | ||
1561 | /** | |
1562 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1563 | * @genpdspec: OF phandle args to map into a PM domain | |
1564 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1565 | * | |
1566 | * This is a generic xlate function that can be used to model simple PM domain | |
1567 | * controllers that have one device tree node and provide multiple PM domains. | |
1568 | * A single cell is used as an index into an array of PM domains specified in | |
1569 | * the genpd_onecell_data struct when registering the provider. | |
1570 | */ | |
1571 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1572 | struct of_phandle_args *genpdspec, | |
1573 | void *data) | |
1574 | { | |
1575 | struct genpd_onecell_data *genpd_data = data; | |
1576 | unsigned int idx = genpdspec->args[0]; | |
1577 | ||
1578 | if (genpdspec->args_count != 1) | |
1579 | return ERR_PTR(-EINVAL); | |
1580 | ||
1581 | if (idx >= genpd_data->num_domains) { | |
1582 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1583 | return ERR_PTR(-EINVAL); | |
1584 | } | |
1585 | ||
1586 | if (!genpd_data->domains[idx]) | |
1587 | return ERR_PTR(-ENOENT); | |
1588 | ||
1589 | return genpd_data->domains[idx]; | |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1592 | ||
1593 | /** | |
1594 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1595 | * @np: Device node pointer associated with the PM domain provider. | |
1596 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1597 | * @data: Context pointer for @xlate callback. | |
1598 | */ | |
1599 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1600 | void *data) | |
1601 | { | |
1602 | struct of_genpd_provider *cp; | |
1603 | ||
1604 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1605 | if (!cp) | |
1606 | return -ENOMEM; | |
1607 | ||
1608 | cp->node = of_node_get(np); | |
1609 | cp->data = data; | |
1610 | cp->xlate = xlate; | |
1611 | ||
1612 | mutex_lock(&of_genpd_mutex); | |
1613 | list_add(&cp->link, &of_genpd_providers); | |
1614 | mutex_unlock(&of_genpd_mutex); | |
1615 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1616 | ||
1617 | return 0; | |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1620 | ||
1621 | /** | |
1622 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1623 | * @np: Device node pointer associated with the PM domain provider | |
1624 | */ | |
1625 | void of_genpd_del_provider(struct device_node *np) | |
1626 | { | |
1627 | struct of_genpd_provider *cp; | |
1628 | ||
1629 | mutex_lock(&of_genpd_mutex); | |
1630 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1631 | if (cp->node == np) { | |
1632 | list_del(&cp->link); | |
1633 | of_node_put(cp->node); | |
1634 | kfree(cp); | |
1635 | break; | |
1636 | } | |
1637 | } | |
1638 | mutex_unlock(&of_genpd_mutex); | |
1639 | } | |
1640 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1641 | ||
1642 | /** | |
1643 | * of_genpd_get_from_provider() - Look-up PM domain | |
1644 | * @genpdspec: OF phandle args to use for look-up | |
1645 | * | |
1646 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1647 | * found, uses xlate function of the provider to map phandle args to a PM | |
1648 | * domain. | |
1649 | * | |
1650 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1651 | * on failure. | |
1652 | */ | |
7496fcbe | 1653 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1654 | struct of_phandle_args *genpdspec) |
1655 | { | |
1656 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1657 | struct of_genpd_provider *provider; | |
1658 | ||
1659 | mutex_lock(&of_genpd_mutex); | |
1660 | ||
1661 | /* Check if we have such a provider in our array */ | |
1662 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1663 | if (provider->node == genpdspec->np) | |
1664 | genpd = provider->xlate(genpdspec, provider->data); | |
1665 | if (!IS_ERR(genpd)) | |
1666 | break; | |
1667 | } | |
1668 | ||
1669 | mutex_unlock(&of_genpd_mutex); | |
1670 | ||
1671 | return genpd; | |
1672 | } | |
7496fcbe | 1673 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1674 | |
1675 | /** | |
1676 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1677 | * @dev: Device to detach. |
aa42240a TF |
1678 | * @power_off: Currently not used |
1679 | * | |
1680 | * Try to locate a corresponding generic PM domain, which the device was | |
1681 | * attached to previously. If such is found, the device is detached from it. | |
1682 | */ | |
1683 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1684 | { | |
446d999c | 1685 | struct generic_pm_domain *pd; |
93af5e93 | 1686 | unsigned int i; |
aa42240a TF |
1687 | int ret = 0; |
1688 | ||
446d999c | 1689 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1690 | if (!pd) |
1691 | return; | |
1692 | ||
1693 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1694 | ||
93af5e93 | 1695 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1696 | ret = pm_genpd_remove_device(pd, dev); |
1697 | if (ret != -EAGAIN) | |
1698 | break; | |
93af5e93 GU |
1699 | |
1700 | mdelay(i); | |
aa42240a TF |
1701 | cond_resched(); |
1702 | } | |
1703 | ||
1704 | if (ret < 0) { | |
1705 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1706 | pd->name, ret); | |
1707 | return; | |
1708 | } | |
1709 | ||
1710 | /* Check if PM domain can be powered off after removing this device. */ | |
1711 | genpd_queue_power_off_work(pd); | |
1712 | } | |
1713 | ||
632f7ce3 RK |
1714 | static void genpd_dev_pm_sync(struct device *dev) |
1715 | { | |
1716 | struct generic_pm_domain *pd; | |
1717 | ||
1718 | pd = dev_to_genpd(dev); | |
1719 | if (IS_ERR(pd)) | |
1720 | return; | |
1721 | ||
1722 | genpd_queue_power_off_work(pd); | |
1723 | } | |
1724 | ||
aa42240a TF |
1725 | /** |
1726 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1727 | * @dev: Device to attach. | |
1728 | * | |
1729 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1730 | * attaches the device to retrieved pm_domain ops. | |
1731 | * | |
1732 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1733 | * backwards compatibility with existing DTBs. | |
1734 | * | |
311fa6ad JH |
1735 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1736 | * that if a power-domain exists for the device, but it cannot be found or | |
1737 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1738 | * probed and to re-try again later. | |
aa42240a TF |
1739 | */ |
1740 | int genpd_dev_pm_attach(struct device *dev) | |
1741 | { | |
1742 | struct of_phandle_args pd_args; | |
1743 | struct generic_pm_domain *pd; | |
93af5e93 | 1744 | unsigned int i; |
aa42240a TF |
1745 | int ret; |
1746 | ||
1747 | if (!dev->of_node) | |
1748 | return -ENODEV; | |
1749 | ||
1750 | if (dev->pm_domain) | |
1751 | return -EEXIST; | |
1752 | ||
1753 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1754 | "#power-domain-cells", 0, &pd_args); | |
1755 | if (ret < 0) { | |
1756 | if (ret != -ENOENT) | |
1757 | return ret; | |
1758 | ||
1759 | /* | |
1760 | * Try legacy Samsung-specific bindings | |
1761 | * (for backwards compatibility of DT ABI) | |
1762 | */ | |
1763 | pd_args.args_count = 0; | |
1764 | pd_args.np = of_parse_phandle(dev->of_node, | |
1765 | "samsung,power-domain", 0); | |
1766 | if (!pd_args.np) | |
1767 | return -ENOENT; | |
1768 | } | |
1769 | ||
1770 | pd = of_genpd_get_from_provider(&pd_args); | |
1771 | if (IS_ERR(pd)) { | |
1772 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1773 | __func__, PTR_ERR(pd)); | |
1774 | of_node_put(dev->of_node); | |
311fa6ad | 1775 | return -EPROBE_DEFER; |
aa42240a TF |
1776 | } |
1777 | ||
1778 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1779 | ||
93af5e93 | 1780 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1781 | ret = pm_genpd_add_device(pd, dev); |
1782 | if (ret != -EAGAIN) | |
1783 | break; | |
93af5e93 GU |
1784 | |
1785 | mdelay(i); | |
aa42240a TF |
1786 | cond_resched(); |
1787 | } | |
1788 | ||
1789 | if (ret < 0) { | |
1790 | dev_err(dev, "failed to add to PM domain %s: %d", | |
1791 | pd->name, ret); | |
1792 | of_node_put(dev->of_node); | |
311fa6ad | 1793 | goto out; |
aa42240a TF |
1794 | } |
1795 | ||
1796 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 1797 | dev->pm_domain->sync = genpd_dev_pm_sync; |
311fa6ad | 1798 | ret = pm_genpd_poweron(pd); |
aa42240a | 1799 | |
311fa6ad JH |
1800 | out: |
1801 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
1802 | } |
1803 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 1804 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
1805 | |
1806 | ||
1807 | /*** debugfs support ***/ | |
1808 | ||
1809 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
1810 | #include <linux/pm.h> | |
1811 | #include <linux/device.h> | |
1812 | #include <linux/debugfs.h> | |
1813 | #include <linux/seq_file.h> | |
1814 | #include <linux/init.h> | |
1815 | #include <linux/kobject.h> | |
1816 | static struct dentry *pm_genpd_debugfs_dir; | |
1817 | ||
1818 | /* | |
1819 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 1820 | * from sysfs.c, so generalize it. |
2bd5306a | 1821 | */ |
2bd5306a MM |
1822 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
1823 | { | |
1824 | static const char * const status_lookup[] = { | |
1825 | [RPM_ACTIVE] = "active", | |
1826 | [RPM_RESUMING] = "resuming", | |
1827 | [RPM_SUSPENDED] = "suspended", | |
1828 | [RPM_SUSPENDING] = "suspending" | |
1829 | }; | |
1830 | const char *p = ""; | |
1831 | ||
1832 | if (dev->power.runtime_error) | |
1833 | p = "error"; | |
1834 | else if (dev->power.disable_depth) | |
1835 | p = "unsupported"; | |
1836 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
1837 | p = status_lookup[dev->power.runtime_status]; | |
1838 | else | |
1839 | WARN_ON(1); | |
1840 | ||
1841 | seq_puts(s, p); | |
1842 | } | |
2bd5306a MM |
1843 | |
1844 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 1845 | struct generic_pm_domain *genpd) |
2bd5306a MM |
1846 | { |
1847 | static const char * const status_lookup[] = { | |
1848 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
1849 | [GPD_STATE_POWER_OFF] = "off" |
1850 | }; | |
1851 | struct pm_domain_data *pm_data; | |
1852 | const char *kobj_path; | |
1853 | struct gpd_link *link; | |
1854 | int ret; | |
1855 | ||
66a5ca4b | 1856 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
1857 | if (ret) |
1858 | return -ERESTARTSYS; | |
1859 | ||
66a5ca4b | 1860 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 1861 | goto exit; |
15dec67a | 1862 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
1863 | |
1864 | /* | |
1865 | * Modifications on the list require holding locks on both | |
1866 | * master and slave, so we are safe. | |
66a5ca4b | 1867 | * Also genpd->name is immutable. |
2bd5306a | 1868 | */ |
66a5ca4b | 1869 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 1870 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 1871 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
1872 | seq_puts(s, ", "); |
1873 | } | |
1874 | ||
66a5ca4b | 1875 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
1876 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
1877 | if (kobj_path == NULL) | |
1878 | continue; | |
1879 | ||
1880 | seq_printf(s, "\n %-50s ", kobj_path); | |
1881 | rtpm_status_str(s, pm_data->dev); | |
1882 | kfree(kobj_path); | |
1883 | } | |
1884 | ||
1885 | seq_puts(s, "\n"); | |
1886 | exit: | |
66a5ca4b | 1887 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
1888 | |
1889 | return 0; | |
1890 | } | |
1891 | ||
1892 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
1893 | { | |
66a5ca4b | 1894 | struct generic_pm_domain *genpd; |
2bd5306a MM |
1895 | int ret = 0; |
1896 | ||
15dec67a GU |
1897 | seq_puts(s, "domain status slaves\n"); |
1898 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
1899 | seq_puts(s, "----------------------------------------------------------------------\n"); |
1900 | ||
1901 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
1902 | if (ret) | |
1903 | return -ERESTARTSYS; | |
1904 | ||
66a5ca4b KH |
1905 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
1906 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
1907 | if (ret) |
1908 | break; | |
1909 | } | |
1910 | mutex_unlock(&gpd_list_lock); | |
1911 | ||
1912 | return ret; | |
1913 | } | |
1914 | ||
1915 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
1916 | { | |
1917 | return single_open(file, pm_genpd_summary_show, NULL); | |
1918 | } | |
1919 | ||
1920 | static const struct file_operations pm_genpd_summary_fops = { | |
1921 | .open = pm_genpd_summary_open, | |
1922 | .read = seq_read, | |
1923 | .llseek = seq_lseek, | |
1924 | .release = single_release, | |
1925 | }; | |
1926 | ||
1927 | static int __init pm_genpd_debug_init(void) | |
1928 | { | |
1929 | struct dentry *d; | |
1930 | ||
1931 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
1932 | ||
1933 | if (!pm_genpd_debugfs_dir) | |
1934 | return -ENOMEM; | |
1935 | ||
1936 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
1937 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
1938 | if (!d) | |
1939 | return -ENOMEM; | |
1940 | ||
1941 | return 0; | |
1942 | } | |
1943 | late_initcall(pm_genpd_debug_init); | |
1944 | ||
1945 | static void __exit pm_genpd_debug_exit(void) | |
1946 | { | |
1947 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
1948 | } | |
1949 | __exitcall(pm_genpd_debug_exit); | |
1950 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |