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 | ||
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 | |
51cda844 UH |
93 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev, |
94 | bool timed) | |
d5e4cbfe | 95 | { |
51cda844 UH |
96 | if (!timed) |
97 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); | |
98 | ||
0140d8bd RW |
99 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
100 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
101 | } |
102 | ||
ba2bbfbf UH |
103 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev, |
104 | bool timed) | |
d5e4cbfe | 105 | { |
ba2bbfbf UH |
106 | if (!timed) |
107 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
108 | ||
0140d8bd RW |
109 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
110 | start_latency_ns, "start"); | |
d5e4cbfe RW |
111 | } |
112 | ||
c4bb3160 | 113 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 114 | { |
c4bb3160 RW |
115 | bool ret = false; |
116 | ||
117 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
118 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
124 | { | |
125 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 126 | smp_mb__after_atomic(); |
f721889f RW |
127 | } |
128 | ||
a4630c61 | 129 | static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
130 | { |
131 | ktime_t time_start; | |
132 | s64 elapsed_ns; | |
133 | int ret; | |
134 | ||
135 | if (!genpd->power_on) | |
136 | return 0; | |
137 | ||
a4630c61 GU |
138 | if (!timed) |
139 | return genpd->power_on(genpd); | |
140 | ||
c8f0ea45 GU |
141 | time_start = ktime_get(); |
142 | ret = genpd->power_on(genpd); | |
143 | if (ret) | |
144 | return ret; | |
145 | ||
146 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
147 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
148 | return ret; | |
149 | ||
150 | genpd->power_on_latency_ns = elapsed_ns; | |
151 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
152 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
153 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
154 | |
155 | return ret; | |
156 | } | |
157 | ||
a4630c61 | 158 | static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
159 | { |
160 | ktime_t time_start; | |
161 | s64 elapsed_ns; | |
162 | int ret; | |
163 | ||
164 | if (!genpd->power_off) | |
165 | return 0; | |
166 | ||
a4630c61 GU |
167 | if (!timed) |
168 | return genpd->power_off(genpd); | |
169 | ||
c8f0ea45 GU |
170 | time_start = ktime_get(); |
171 | ret = genpd->power_off(genpd); | |
172 | if (ret == -EBUSY) | |
173 | return ret; | |
174 | ||
175 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
176 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
177 | return ret; | |
178 | ||
179 | genpd->power_off_latency_ns = elapsed_ns; | |
180 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
181 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
182 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
183 | |
184 | return ret; | |
185 | } | |
186 | ||
29e47e21 | 187 | /** |
7420aa4f | 188 | * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). |
29e47e21 UH |
189 | * @genpd: PM domait to power off. |
190 | * | |
7420aa4f | 191 | * Queue up the execution of genpd_poweroff() unless it's already been done |
29e47e21 UH |
192 | * before. |
193 | */ | |
194 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
195 | { | |
196 | queue_work(pm_wq, &genpd->power_off_work); | |
197 | } | |
198 | ||
7420aa4f | 199 | static int genpd_poweron(struct generic_pm_domain *genpd); |
ea823c7c | 200 | |
5248051b | 201 | /** |
7420aa4f | 202 | * __genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
203 | * @genpd: PM domain to power up. |
204 | * | |
5063ce15 | 205 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
206 | * resume a device belonging to it. |
207 | */ | |
7420aa4f | 208 | static int __genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 209 | { |
5063ce15 | 210 | struct gpd_link *link; |
5248051b RW |
211 | int ret = 0; |
212 | ||
17b75eca | 213 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 214 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 215 | return 0; |
5248051b | 216 | |
5063ce15 RW |
217 | /* |
218 | * The list is guaranteed not to change while the loop below is being | |
219 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
220 | * with it. | |
221 | */ | |
222 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
223 | genpd_sd_counter_inc(link->master); | |
5248051b | 224 | |
7420aa4f | 225 | ret = genpd_poweron(link->master); |
5063ce15 RW |
226 | if (ret) { |
227 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 228 | goto err; |
5063ce15 | 229 | } |
5248051b RW |
230 | } |
231 | ||
a4630c61 | 232 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
233 | if (ret) |
234 | goto err; | |
5248051b | 235 | |
ba2bbfbf | 236 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 237 | return 0; |
9e08cf42 RW |
238 | |
239 | err: | |
29e47e21 UH |
240 | list_for_each_entry_continue_reverse(link, |
241 | &genpd->slave_links, | |
242 | slave_node) { | |
5063ce15 | 243 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
244 | genpd_queue_power_off_work(link->master); |
245 | } | |
9e08cf42 | 246 | |
3f241775 RW |
247 | return ret; |
248 | } | |
249 | ||
250 | /** | |
7420aa4f | 251 | * genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
252 | * @genpd: PM domain to power up. |
253 | */ | |
7420aa4f | 254 | static int genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 RW |
255 | { |
256 | int ret; | |
257 | ||
258 | mutex_lock(&genpd->lock); | |
7420aa4f | 259 | ret = __genpd_poweron(genpd); |
3f241775 RW |
260 | mutex_unlock(&genpd->lock); |
261 | return ret; | |
5248051b RW |
262 | } |
263 | ||
8e9afafd RW |
264 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
265 | { | |
266 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
267 | save_state_latency_ns, "state save"); | |
268 | } | |
269 | ||
ba2bbfbf UH |
270 | static int genpd_restore_dev(struct generic_pm_domain *genpd, |
271 | struct device *dev, bool timed) | |
8e9afafd | 272 | { |
ba2bbfbf UH |
273 | if (!timed) |
274 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); | |
275 | ||
8e9afafd RW |
276 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
277 | restore_state_latency_ns, | |
278 | "state restore"); | |
279 | } | |
280 | ||
6ff7bb0d RW |
281 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
282 | unsigned long val, void *ptr) | |
283 | { | |
284 | struct generic_pm_domain_data *gpd_data; | |
285 | struct device *dev; | |
286 | ||
287 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 288 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
289 | |
290 | for (;;) { | |
291 | struct generic_pm_domain *genpd; | |
292 | struct pm_domain_data *pdd; | |
293 | ||
294 | spin_lock_irq(&dev->power.lock); | |
295 | ||
296 | pdd = dev->power.subsys_data ? | |
297 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 298 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
299 | to_gpd_data(pdd)->td.constraint_changed = true; |
300 | genpd = dev_to_genpd(dev); | |
301 | } else { | |
302 | genpd = ERR_PTR(-ENODATA); | |
303 | } | |
304 | ||
305 | spin_unlock_irq(&dev->power.lock); | |
306 | ||
307 | if (!IS_ERR(genpd)) { | |
308 | mutex_lock(&genpd->lock); | |
309 | genpd->max_off_time_changed = true; | |
310 | mutex_unlock(&genpd->lock); | |
311 | } | |
312 | ||
313 | dev = dev->parent; | |
314 | if (!dev || dev->power.ignore_children) | |
315 | break; | |
316 | } | |
317 | ||
318 | return NOTIFY_DONE; | |
319 | } | |
320 | ||
f721889f | 321 | /** |
7420aa4f | 322 | * genpd_poweroff - Remove power from a given PM domain. |
f721889f | 323 | * @genpd: PM domain to power down. |
f96b3c4f | 324 | * @is_async: PM domain is powered down from a scheduled work |
f721889f RW |
325 | * |
326 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 327 | * have been powered down, remove power from @genpd. |
f721889f | 328 | */ |
7420aa4f | 329 | static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) |
f721889f | 330 | { |
4605ab65 | 331 | struct pm_domain_data *pdd; |
5063ce15 | 332 | struct gpd_link *link; |
ba2bbfbf | 333 | unsigned int not_suspended = 0; |
f721889f | 334 | |
c6d22b37 RW |
335 | /* |
336 | * Do not try to power off the domain in the following situations: | |
337 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 338 | * (2) System suspend is in progress. |
c6d22b37 | 339 | */ |
3f241775 | 340 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 341 | || genpd->prepared_count > 0) |
f721889f RW |
342 | return 0; |
343 | ||
c4bb3160 | 344 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
345 | return -EBUSY; |
346 | ||
34b1f762 RW |
347 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
348 | enum pm_qos_flags_status stat; | |
349 | ||
350 | stat = dev_pm_qos_flags(pdd->dev, | |
351 | PM_QOS_FLAG_NO_POWER_OFF | |
352 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
353 | if (stat > PM_QOS_FLAGS_NONE) | |
354 | return -EBUSY; | |
355 | ||
0aa2a221 | 356 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 357 | || pdd->dev->power.irq_safe)) |
f721889f | 358 | not_suspended++; |
34b1f762 | 359 | } |
f721889f | 360 | |
f96b3c4f | 361 | if (not_suspended > 1 || (not_suspended == 1 && is_async)) |
f721889f RW |
362 | return -EBUSY; |
363 | ||
364 | if (genpd->gov && genpd->gov->power_down_ok) { | |
365 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
366 | return -EAGAIN; | |
367 | } | |
368 | ||
3c07cbc4 | 369 | if (genpd->power_off) { |
ba2bbfbf UH |
370 | int ret; |
371 | ||
372 | if (atomic_read(&genpd->sd_count) > 0) | |
373 | return -EBUSY; | |
17b75eca | 374 | |
3c07cbc4 | 375 | /* |
5063ce15 | 376 | * If sd_count > 0 at this point, one of the subdomains hasn't |
7420aa4f UH |
377 | * managed to call genpd_poweron() for the master yet after |
378 | * incrementing it. In that case genpd_poweron() will wait | |
3c07cbc4 | 379 | * for us to drop the lock, so we can call .power_off() and let |
7420aa4f | 380 | * the genpd_poweron() restore power for us (this shouldn't |
3c07cbc4 RW |
381 | * happen very often). |
382 | */ | |
a4630c61 | 383 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
384 | if (ret) |
385 | return ret; | |
d2805402 | 386 | } |
f721889f | 387 | |
17b75eca | 388 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 389 | |
5063ce15 RW |
390 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
391 | genpd_sd_counter_dec(link->master); | |
392 | genpd_queue_power_off_work(link->master); | |
393 | } | |
f721889f | 394 | |
ba2bbfbf | 395 | return 0; |
f721889f RW |
396 | } |
397 | ||
398 | /** | |
399 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
400 | * @work: Work structure used for scheduling the execution of this function. | |
401 | */ | |
402 | static void genpd_power_off_work_fn(struct work_struct *work) | |
403 | { | |
404 | struct generic_pm_domain *genpd; | |
405 | ||
406 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
407 | ||
ba2bbfbf | 408 | mutex_lock(&genpd->lock); |
7420aa4f | 409 | genpd_poweroff(genpd, true); |
ba2bbfbf | 410 | mutex_unlock(&genpd->lock); |
f721889f RW |
411 | } |
412 | ||
413 | /** | |
414 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
415 | * @dev: Device to suspend. | |
416 | * | |
417 | * Carry out a runtime suspend of a device under the assumption that its | |
418 | * pm_domain field points to the domain member of an object of type | |
419 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
420 | */ | |
421 | static int pm_genpd_runtime_suspend(struct device *dev) | |
422 | { | |
423 | struct generic_pm_domain *genpd; | |
b02c999a | 424 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 425 | int ret; |
f721889f RW |
426 | |
427 | dev_dbg(dev, "%s()\n", __func__); | |
428 | ||
5248051b RW |
429 | genpd = dev_to_genpd(dev); |
430 | if (IS_ERR(genpd)) | |
f721889f RW |
431 | return -EINVAL; |
432 | ||
b02c999a RW |
433 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
434 | if (stop_ok && !stop_ok(dev)) | |
435 | return -EBUSY; | |
436 | ||
ba2bbfbf | 437 | ret = genpd_save_dev(genpd, dev); |
d5e4cbfe RW |
438 | if (ret) |
439 | return ret; | |
17b75eca | 440 | |
51cda844 | 441 | ret = genpd_stop_dev(genpd, dev, true); |
ba2bbfbf UH |
442 | if (ret) { |
443 | genpd_restore_dev(genpd, dev, true); | |
444 | return ret; | |
445 | } | |
446 | ||
0aa2a221 RW |
447 | /* |
448 | * If power.irq_safe is set, this routine will be run with interrupts | |
449 | * off, so it can't use mutexes. | |
450 | */ | |
451 | if (dev->power.irq_safe) | |
452 | return 0; | |
453 | ||
c6d22b37 | 454 | mutex_lock(&genpd->lock); |
7420aa4f | 455 | genpd_poweroff(genpd, false); |
c6d22b37 | 456 | mutex_unlock(&genpd->lock); |
f721889f RW |
457 | |
458 | return 0; | |
459 | } | |
460 | ||
f721889f RW |
461 | /** |
462 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
463 | * @dev: Device to resume. | |
464 | * | |
465 | * Carry out a runtime resume of a device under the assumption that its | |
466 | * pm_domain field points to the domain member of an object of type | |
467 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
468 | */ | |
469 | static int pm_genpd_runtime_resume(struct device *dev) | |
470 | { | |
471 | struct generic_pm_domain *genpd; | |
f721889f | 472 | int ret; |
ba2bbfbf | 473 | bool timed = true; |
f721889f RW |
474 | |
475 | dev_dbg(dev, "%s()\n", __func__); | |
476 | ||
5248051b RW |
477 | genpd = dev_to_genpd(dev); |
478 | if (IS_ERR(genpd)) | |
f721889f RW |
479 | return -EINVAL; |
480 | ||
0aa2a221 | 481 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
482 | if (dev->power.irq_safe) { |
483 | timed = false; | |
484 | goto out; | |
485 | } | |
0aa2a221 | 486 | |
c6d22b37 | 487 | mutex_lock(&genpd->lock); |
7420aa4f | 488 | ret = __genpd_poweron(genpd); |
ba2bbfbf | 489 | mutex_unlock(&genpd->lock); |
c6d22b37 | 490 | |
ba2bbfbf UH |
491 | if (ret) |
492 | return ret; | |
c6d22b37 | 493 | |
ba2bbfbf UH |
494 | out: |
495 | genpd_start_dev(genpd, dev, timed); | |
496 | genpd_restore_dev(genpd, dev, timed); | |
17b75eca | 497 | |
f721889f RW |
498 | return 0; |
499 | } | |
500 | ||
39ac5ba5 TB |
501 | static bool pd_ignore_unused; |
502 | static int __init pd_ignore_unused_setup(char *__unused) | |
503 | { | |
504 | pd_ignore_unused = true; | |
505 | return 1; | |
506 | } | |
507 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
508 | ||
17f2ae7f | 509 | /** |
bb4b72fc | 510 | * genpd_poweroff_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 511 | */ |
bb4b72fc | 512 | static int __init genpd_poweroff_unused(void) |
17f2ae7f RW |
513 | { |
514 | struct generic_pm_domain *genpd; | |
515 | ||
39ac5ba5 TB |
516 | if (pd_ignore_unused) { |
517 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 518 | return 0; |
39ac5ba5 TB |
519 | } |
520 | ||
17f2ae7f RW |
521 | mutex_lock(&gpd_list_lock); |
522 | ||
523 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
524 | genpd_queue_power_off_work(genpd); | |
525 | ||
526 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 527 | |
2fe71dcd UH |
528 | return 0; |
529 | } | |
530 | late_initcall(genpd_poweroff_unused); | |
531 | ||
596ba34b RW |
532 | #ifdef CONFIG_PM_SLEEP |
533 | ||
77f827de RW |
534 | /** |
535 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
536 | * @genpd: PM domain to check. | |
537 | */ | |
895b31f3 | 538 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 539 | { |
895b31f3 | 540 | const struct generic_pm_domain *gpd; |
77f827de RW |
541 | |
542 | if (IS_ERR_OR_NULL(genpd)) | |
543 | return false; | |
544 | ||
545 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
546 | if (gpd == genpd) | |
547 | return true; | |
548 | ||
549 | return false; | |
550 | } | |
551 | ||
d5e4cbfe RW |
552 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
553 | struct device *dev) | |
554 | { | |
555 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
556 | } | |
557 | ||
596ba34b | 558 | /** |
5063ce15 | 559 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 560 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 561 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
562 | * |
563 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 564 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 565 | * |
77f827de RW |
566 | * This function is only called in "noirq" and "syscore" stages of system power |
567 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
568 | * executed sequentially, so it is guaranteed that it will never run twice in | |
569 | * parallel). | |
596ba34b | 570 | */ |
a4630c61 GU |
571 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
572 | bool timed) | |
596ba34b | 573 | { |
5063ce15 | 574 | struct gpd_link *link; |
596ba34b | 575 | |
17b75eca | 576 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
577 | return; |
578 | ||
c4bb3160 RW |
579 | if (genpd->suspended_count != genpd->device_count |
580 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
581 | return; |
582 | ||
a4630c61 | 583 | genpd_power_off(genpd, timed); |
596ba34b | 584 | |
17b75eca | 585 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
586 | |
587 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
588 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 589 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
590 | } |
591 | } | |
592 | ||
802d8b49 RW |
593 | /** |
594 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
595 | * @genpd: PM domain to power on. | |
a4630c61 | 596 | * @timed: True if latency measurements are allowed. |
802d8b49 | 597 | * |
77f827de RW |
598 | * This function is only called in "noirq" and "syscore" stages of system power |
599 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
600 | * executed sequentially, so it is guaranteed that it will never run twice in | |
601 | * parallel). | |
802d8b49 | 602 | */ |
a4630c61 GU |
603 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
604 | bool timed) | |
802d8b49 RW |
605 | { |
606 | struct gpd_link *link; | |
607 | ||
ba2bbfbf | 608 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
609 | return; |
610 | ||
611 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 612 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
613 | genpd_sd_counter_inc(link->master); |
614 | } | |
615 | ||
a4630c61 | 616 | genpd_power_on(genpd, timed); |
802d8b49 RW |
617 | |
618 | genpd->status = GPD_STATE_ACTIVE; | |
619 | } | |
620 | ||
4ecd6e65 RW |
621 | /** |
622 | * resume_needed - Check whether to resume a device before system suspend. | |
623 | * @dev: Device to check. | |
624 | * @genpd: PM domain the device belongs to. | |
625 | * | |
626 | * There are two cases in which a device that can wake up the system from sleep | |
627 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
628 | * to wake up the system and it has to remain active for this purpose while the | |
629 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
630 | * the system from sleep states and it generally doesn't generate wakeup signals | |
631 | * by itself (those signals are generated on its behalf by other parts of the | |
632 | * system). In the latter case it may be necessary to reconfigure the device's | |
633 | * wakeup settings during system suspend, because it may have been set up to | |
634 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
635 | * Return 'true' in either of the above cases. | |
636 | */ | |
637 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
638 | { | |
639 | bool active_wakeup; | |
640 | ||
641 | if (!device_can_wakeup(dev)) | |
642 | return false; | |
643 | ||
d5e4cbfe | 644 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
645 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
646 | } | |
647 | ||
596ba34b RW |
648 | /** |
649 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
650 | * @dev: Device to start the transition of. | |
651 | * | |
652 | * Start a power transition of a device (during a system-wide power transition) | |
653 | * under the assumption that its pm_domain field points to the domain member of | |
654 | * an object of type struct generic_pm_domain representing a PM domain | |
655 | * consisting of I/O devices. | |
656 | */ | |
657 | static int pm_genpd_prepare(struct device *dev) | |
658 | { | |
659 | struct generic_pm_domain *genpd; | |
b6c10c84 | 660 | int ret; |
596ba34b RW |
661 | |
662 | dev_dbg(dev, "%s()\n", __func__); | |
663 | ||
664 | genpd = dev_to_genpd(dev); | |
665 | if (IS_ERR(genpd)) | |
666 | return -EINVAL; | |
667 | ||
17b75eca RW |
668 | /* |
669 | * If a wakeup request is pending for the device, it should be woken up | |
670 | * at this point and a system wakeup event should be reported if it's | |
671 | * set up to wake up the system from sleep states. | |
672 | */ | |
673 | pm_runtime_get_noresume(dev); | |
674 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
675 | pm_wakeup_event(dev, 0); | |
676 | ||
677 | if (pm_wakeup_pending()) { | |
84167035 | 678 | pm_runtime_put(dev); |
17b75eca RW |
679 | return -EBUSY; |
680 | } | |
681 | ||
4ecd6e65 RW |
682 | if (resume_needed(dev, genpd)) |
683 | pm_runtime_resume(dev); | |
684 | ||
ba2bbfbf | 685 | mutex_lock(&genpd->lock); |
596ba34b | 686 | |
65533bbf RW |
687 | if (genpd->prepared_count++ == 0) { |
688 | genpd->suspended_count = 0; | |
17b75eca | 689 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 690 | } |
17b75eca | 691 | |
ba2bbfbf | 692 | mutex_unlock(&genpd->lock); |
596ba34b RW |
693 | |
694 | if (genpd->suspend_power_off) { | |
17b75eca | 695 | pm_runtime_put_noidle(dev); |
596ba34b RW |
696 | return 0; |
697 | } | |
698 | ||
699 | /* | |
17b75eca | 700 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
7420aa4f | 701 | * so genpd_poweron() will return immediately, but if the device |
d5e4cbfe | 702 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 703 | * to make it operational. |
596ba34b | 704 | */ |
17b75eca | 705 | pm_runtime_resume(dev); |
596ba34b RW |
706 | __pm_runtime_disable(dev, false); |
707 | ||
b6c10c84 RW |
708 | ret = pm_generic_prepare(dev); |
709 | if (ret) { | |
710 | mutex_lock(&genpd->lock); | |
711 | ||
712 | if (--genpd->prepared_count == 0) | |
713 | genpd->suspend_power_off = false; | |
714 | ||
715 | mutex_unlock(&genpd->lock); | |
17b75eca | 716 | pm_runtime_enable(dev); |
b6c10c84 | 717 | } |
17b75eca | 718 | |
84167035 | 719 | pm_runtime_put(dev); |
b6c10c84 | 720 | return ret; |
596ba34b RW |
721 | } |
722 | ||
723 | /** | |
724 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
725 | * @dev: Device to suspend. | |
726 | * | |
727 | * Suspend a device under the assumption that its pm_domain field points to the | |
728 | * domain member of an object of type struct generic_pm_domain representing | |
729 | * a PM domain consisting of I/O devices. | |
730 | */ | |
731 | static int pm_genpd_suspend(struct device *dev) | |
732 | { | |
733 | struct generic_pm_domain *genpd; | |
734 | ||
735 | dev_dbg(dev, "%s()\n", __func__); | |
736 | ||
737 | genpd = dev_to_genpd(dev); | |
738 | if (IS_ERR(genpd)) | |
739 | return -EINVAL; | |
740 | ||
1e0407ca | 741 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
742 | } |
743 | ||
744 | /** | |
0496c8ae | 745 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
746 | * @dev: Device to suspend. |
747 | * | |
748 | * Carry out a late suspend of a device under the assumption that its | |
749 | * pm_domain field points to the domain member of an object of type | |
750 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
751 | */ | |
0496c8ae | 752 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
753 | { |
754 | struct generic_pm_domain *genpd; | |
596ba34b RW |
755 | |
756 | dev_dbg(dev, "%s()\n", __func__); | |
757 | ||
758 | genpd = dev_to_genpd(dev); | |
759 | if (IS_ERR(genpd)) | |
760 | return -EINVAL; | |
761 | ||
1e0407ca | 762 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 763 | } |
596ba34b | 764 | |
0496c8ae RW |
765 | /** |
766 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
767 | * @dev: Device to suspend. | |
768 | * | |
769 | * Stop the device and remove power from the domain if all devices in it have | |
770 | * been stopped. | |
771 | */ | |
772 | static int pm_genpd_suspend_noirq(struct device *dev) | |
773 | { | |
774 | struct generic_pm_domain *genpd; | |
775 | ||
776 | dev_dbg(dev, "%s()\n", __func__); | |
777 | ||
778 | genpd = dev_to_genpd(dev); | |
779 | if (IS_ERR(genpd)) | |
780 | return -EINVAL; | |
596ba34b | 781 | |
dbf37414 | 782 | if (genpd->suspend_power_off |
0496c8ae | 783 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
784 | return 0; |
785 | ||
51cda844 | 786 | genpd_stop_dev(genpd, dev, false); |
596ba34b RW |
787 | |
788 | /* | |
789 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
790 | * guaranteed that this function will never run twice in parallel for | |
791 | * the same PM domain, so it is not necessary to use locking here. | |
792 | */ | |
793 | genpd->suspended_count++; | |
a4630c61 | 794 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
795 | |
796 | return 0; | |
797 | } | |
798 | ||
799 | /** | |
0496c8ae | 800 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
801 | * @dev: Device to resume. |
802 | * | |
0496c8ae | 803 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
804 | */ |
805 | static int pm_genpd_resume_noirq(struct device *dev) | |
806 | { | |
807 | struct generic_pm_domain *genpd; | |
808 | ||
809 | dev_dbg(dev, "%s()\n", __func__); | |
810 | ||
811 | genpd = dev_to_genpd(dev); | |
812 | if (IS_ERR(genpd)) | |
813 | return -EINVAL; | |
814 | ||
dbf37414 | 815 | if (genpd->suspend_power_off |
cc85b207 | 816 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
817 | return 0; |
818 | ||
819 | /* | |
820 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
821 | * guaranteed that this function will never run twice in parallel for | |
822 | * the same PM domain, so it is not necessary to use locking here. | |
823 | */ | |
a4630c61 | 824 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 825 | genpd->suspended_count--; |
596ba34b | 826 | |
51cda844 | 827 | return genpd_start_dev(genpd, dev, false); |
596ba34b RW |
828 | } |
829 | ||
830 | /** | |
0496c8ae RW |
831 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
832 | * @dev: Device to resume. | |
833 | * | |
834 | * Carry out an early resume of a device under the assumption that its | |
835 | * pm_domain field points to the domain member of an object of type | |
836 | * struct generic_pm_domain representing a power domain consisting of I/O | |
837 | * devices. | |
838 | */ | |
839 | static int pm_genpd_resume_early(struct device *dev) | |
840 | { | |
841 | struct generic_pm_domain *genpd; | |
842 | ||
843 | dev_dbg(dev, "%s()\n", __func__); | |
844 | ||
845 | genpd = dev_to_genpd(dev); | |
846 | if (IS_ERR(genpd)) | |
847 | return -EINVAL; | |
848 | ||
1e0407ca | 849 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
850 | } |
851 | ||
852 | /** | |
853 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
854 | * @dev: Device to resume. |
855 | * | |
856 | * Resume a device under the assumption that its pm_domain field points to the | |
857 | * domain member of an object of type struct generic_pm_domain representing | |
858 | * a power domain consisting of I/O devices. | |
859 | */ | |
860 | static int pm_genpd_resume(struct device *dev) | |
861 | { | |
862 | struct generic_pm_domain *genpd; | |
863 | ||
864 | dev_dbg(dev, "%s()\n", __func__); | |
865 | ||
866 | genpd = dev_to_genpd(dev); | |
867 | if (IS_ERR(genpd)) | |
868 | return -EINVAL; | |
869 | ||
1e0407ca | 870 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
871 | } |
872 | ||
873 | /** | |
0496c8ae | 874 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
875 | * @dev: Device to freeze. |
876 | * | |
877 | * Freeze a device under the assumption that its pm_domain field points to the | |
878 | * domain member of an object of type struct generic_pm_domain representing | |
879 | * a power domain consisting of I/O devices. | |
880 | */ | |
881 | static int pm_genpd_freeze(struct device *dev) | |
882 | { | |
883 | struct generic_pm_domain *genpd; | |
884 | ||
885 | dev_dbg(dev, "%s()\n", __func__); | |
886 | ||
887 | genpd = dev_to_genpd(dev); | |
888 | if (IS_ERR(genpd)) | |
889 | return -EINVAL; | |
890 | ||
1e0407ca | 891 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
892 | } |
893 | ||
894 | /** | |
0496c8ae RW |
895 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
896 | * @dev: Device to freeze. | |
897 | * | |
898 | * Carry out a late freeze of a device under the assumption that its | |
899 | * pm_domain field points to the domain member of an object of type | |
900 | * struct generic_pm_domain representing a power domain consisting of I/O | |
901 | * devices. | |
902 | */ | |
903 | static int pm_genpd_freeze_late(struct device *dev) | |
904 | { | |
905 | struct generic_pm_domain *genpd; | |
906 | ||
907 | dev_dbg(dev, "%s()\n", __func__); | |
908 | ||
909 | genpd = dev_to_genpd(dev); | |
910 | if (IS_ERR(genpd)) | |
911 | return -EINVAL; | |
912 | ||
1e0407ca | 913 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
914 | } |
915 | ||
916 | /** | |
917 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
918 | * @dev: Device to freeze. |
919 | * | |
920 | * Carry out a late freeze of a device under the assumption that its | |
921 | * pm_domain field points to the domain member of an object of type | |
922 | * struct generic_pm_domain representing a power domain consisting of I/O | |
923 | * devices. | |
924 | */ | |
925 | static int pm_genpd_freeze_noirq(struct device *dev) | |
926 | { | |
927 | struct generic_pm_domain *genpd; | |
596ba34b RW |
928 | |
929 | dev_dbg(dev, "%s()\n", __func__); | |
930 | ||
931 | genpd = dev_to_genpd(dev); | |
932 | if (IS_ERR(genpd)) | |
933 | return -EINVAL; | |
934 | ||
51cda844 | 935 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev, false); |
0496c8ae | 936 | } |
596ba34b | 937 | |
0496c8ae RW |
938 | /** |
939 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
940 | * @dev: Device to thaw. | |
941 | * | |
942 | * Start the device, unless power has been removed from the domain already | |
943 | * before the system transition. | |
944 | */ | |
945 | static int pm_genpd_thaw_noirq(struct device *dev) | |
946 | { | |
947 | struct generic_pm_domain *genpd; | |
596ba34b | 948 | |
0496c8ae | 949 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 950 | |
0496c8ae RW |
951 | genpd = dev_to_genpd(dev); |
952 | if (IS_ERR(genpd)) | |
953 | return -EINVAL; | |
954 | ||
51cda844 UH |
955 | return genpd->suspend_power_off ? |
956 | 0 : genpd_start_dev(genpd, dev, false); | |
596ba34b RW |
957 | } |
958 | ||
959 | /** | |
0496c8ae | 960 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
961 | * @dev: Device to thaw. |
962 | * | |
963 | * Carry out an early thaw of a device under the assumption that its | |
964 | * pm_domain field points to the domain member of an object of type | |
965 | * struct generic_pm_domain representing a power domain consisting of I/O | |
966 | * devices. | |
967 | */ | |
0496c8ae | 968 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
969 | { |
970 | struct generic_pm_domain *genpd; | |
971 | ||
972 | dev_dbg(dev, "%s()\n", __func__); | |
973 | ||
974 | genpd = dev_to_genpd(dev); | |
975 | if (IS_ERR(genpd)) | |
976 | return -EINVAL; | |
977 | ||
1e0407ca | 978 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
979 | } |
980 | ||
981 | /** | |
982 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
983 | * @dev: Device to thaw. | |
984 | * | |
985 | * Thaw a device under the assumption that its pm_domain field points to the | |
986 | * domain member of an object of type struct generic_pm_domain representing | |
987 | * a power domain consisting of I/O devices. | |
988 | */ | |
989 | static int pm_genpd_thaw(struct device *dev) | |
990 | { | |
991 | struct generic_pm_domain *genpd; | |
992 | ||
993 | dev_dbg(dev, "%s()\n", __func__); | |
994 | ||
995 | genpd = dev_to_genpd(dev); | |
996 | if (IS_ERR(genpd)) | |
997 | return -EINVAL; | |
998 | ||
1e0407ca | 999 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1000 | } |
1001 | ||
1002 | /** | |
0496c8ae | 1003 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1004 | * @dev: Device to resume. |
1005 | * | |
0496c8ae RW |
1006 | * Make sure the domain will be in the same power state as before the |
1007 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1008 | */ |
1009 | static int pm_genpd_restore_noirq(struct device *dev) | |
1010 | { | |
1011 | struct generic_pm_domain *genpd; | |
1012 | ||
1013 | dev_dbg(dev, "%s()\n", __func__); | |
1014 | ||
1015 | genpd = dev_to_genpd(dev); | |
1016 | if (IS_ERR(genpd)) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | /* | |
1020 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1021 | * guaranteed that this function will never run twice in parallel for | |
1022 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1023 | * |
1024 | * At this point suspended_count == 0 means we are being run for the | |
1025 | * first time for the given domain in the present cycle. | |
596ba34b | 1026 | */ |
65533bbf | 1027 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1028 | /* |
65533bbf | 1029 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1030 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1031 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1032 | */ |
65533bbf RW |
1033 | genpd->status = GPD_STATE_POWER_OFF; |
1034 | if (genpd->suspend_power_off) { | |
1035 | /* | |
1036 | * If the domain was off before the hibernation, make | |
1037 | * sure it will be off going forward. | |
1038 | */ | |
a4630c61 | 1039 | genpd_power_off(genpd, true); |
65533bbf RW |
1040 | |
1041 | return 0; | |
1042 | } | |
596ba34b RW |
1043 | } |
1044 | ||
18dd2ece RW |
1045 | if (genpd->suspend_power_off) |
1046 | return 0; | |
1047 | ||
a4630c61 | 1048 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 1049 | |
51cda844 | 1050 | return genpd_start_dev(genpd, dev, false); |
596ba34b RW |
1051 | } |
1052 | ||
1053 | /** | |
1054 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1055 | * @dev: Device to complete the transition of. | |
1056 | * | |
1057 | * Complete a power transition of a device (during a system-wide power | |
1058 | * transition) under the assumption that its pm_domain field points to the | |
1059 | * domain member of an object of type struct generic_pm_domain representing | |
1060 | * a power domain consisting of I/O devices. | |
1061 | */ | |
1062 | static void pm_genpd_complete(struct device *dev) | |
1063 | { | |
1064 | struct generic_pm_domain *genpd; | |
1065 | bool run_complete; | |
1066 | ||
1067 | dev_dbg(dev, "%s()\n", __func__); | |
1068 | ||
1069 | genpd = dev_to_genpd(dev); | |
1070 | if (IS_ERR(genpd)) | |
1071 | return; | |
1072 | ||
1073 | mutex_lock(&genpd->lock); | |
1074 | ||
1075 | run_complete = !genpd->suspend_power_off; | |
1076 | if (--genpd->prepared_count == 0) | |
1077 | genpd->suspend_power_off = false; | |
1078 | ||
1079 | mutex_unlock(&genpd->lock); | |
1080 | ||
1081 | if (run_complete) { | |
1082 | pm_generic_complete(dev); | |
6f00ff78 | 1083 | pm_runtime_set_active(dev); |
596ba34b | 1084 | pm_runtime_enable(dev); |
af939339 | 1085 | pm_request_idle(dev); |
596ba34b RW |
1086 | } |
1087 | } | |
1088 | ||
77f827de | 1089 | /** |
d47e6464 | 1090 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1091 | * @dev: Device that normally is marked as "always on" to switch power for. |
1092 | * | |
1093 | * This routine may only be called during the system core (syscore) suspend or | |
1094 | * resume phase for devices whose "always on" flags are set. | |
1095 | */ | |
d47e6464 | 1096 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1097 | { |
1098 | struct generic_pm_domain *genpd; | |
1099 | ||
1100 | genpd = dev_to_genpd(dev); | |
1101 | if (!pm_genpd_present(genpd)) | |
1102 | return; | |
1103 | ||
1104 | if (suspend) { | |
1105 | genpd->suspended_count++; | |
a4630c61 | 1106 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 1107 | } else { |
a4630c61 | 1108 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
1109 | genpd->suspended_count--; |
1110 | } | |
1111 | } | |
d47e6464 UH |
1112 | |
1113 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1114 | { | |
1115 | genpd_syscore_switch(dev, true); | |
1116 | } | |
1117 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1118 | ||
1119 | void pm_genpd_syscore_poweron(struct device *dev) | |
1120 | { | |
1121 | genpd_syscore_switch(dev, false); | |
1122 | } | |
1123 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1124 | |
d30d819d | 1125 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1126 | |
1127 | #define pm_genpd_prepare NULL | |
1128 | #define pm_genpd_suspend NULL | |
0496c8ae | 1129 | #define pm_genpd_suspend_late NULL |
596ba34b | 1130 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1131 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1132 | #define pm_genpd_resume_noirq NULL |
1133 | #define pm_genpd_resume NULL | |
1134 | #define pm_genpd_freeze NULL | |
0496c8ae | 1135 | #define pm_genpd_freeze_late NULL |
596ba34b | 1136 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1137 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1138 | #define pm_genpd_thaw_noirq NULL |
1139 | #define pm_genpd_thaw NULL | |
596ba34b | 1140 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1141 | #define pm_genpd_complete NULL |
1142 | ||
1143 | #endif /* CONFIG_PM_SLEEP */ | |
1144 | ||
f104e1e5 UH |
1145 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1146 | struct generic_pm_domain *genpd, | |
1147 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1148 | { |
1149 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1150 | int ret; |
1151 | ||
1152 | ret = dev_pm_get_subsys_data(dev); | |
1153 | if (ret) | |
1154 | return ERR_PTR(ret); | |
1d5fcfec RW |
1155 | |
1156 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1157 | if (!gpd_data) { |
1158 | ret = -ENOMEM; | |
1159 | goto err_put; | |
1160 | } | |
1d5fcfec | 1161 | |
f104e1e5 UH |
1162 | if (td) |
1163 | gpd_data->td = *td; | |
1164 | ||
1165 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1166 | gpd_data->td.constraint_changed = true; |
1167 | gpd_data->td.effective_constraint_ns = -1; | |
1168 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1169 | ||
1170 | spin_lock_irq(&dev->power.lock); | |
1171 | ||
1172 | if (dev->power.subsys_data->domain_data) { | |
1173 | ret = -EINVAL; | |
1174 | goto err_free; | |
1175 | } | |
1176 | ||
1177 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1178 | dev->pm_domain = &genpd->domain; | |
1179 | ||
1180 | spin_unlock_irq(&dev->power.lock); | |
1181 | ||
1d5fcfec | 1182 | return gpd_data; |
3e235685 | 1183 | |
f104e1e5 UH |
1184 | err_free: |
1185 | spin_unlock_irq(&dev->power.lock); | |
1186 | kfree(gpd_data); | |
3e235685 UH |
1187 | err_put: |
1188 | dev_pm_put_subsys_data(dev); | |
1189 | return ERR_PTR(ret); | |
1d5fcfec RW |
1190 | } |
1191 | ||
49d400c7 UH |
1192 | static void genpd_free_dev_data(struct device *dev, |
1193 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1194 | { |
f104e1e5 UH |
1195 | spin_lock_irq(&dev->power.lock); |
1196 | ||
1197 | dev->pm_domain = NULL; | |
1198 | dev->power.subsys_data->domain_data = NULL; | |
1199 | ||
1200 | spin_unlock_irq(&dev->power.lock); | |
1201 | ||
1d5fcfec | 1202 | kfree(gpd_data); |
3e235685 | 1203 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1204 | } |
1205 | ||
f721889f | 1206 | /** |
b02c999a | 1207 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1208 | * @genpd: PM domain to add the device to. |
1209 | * @dev: Device to be added. | |
b02c999a | 1210 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1211 | */ |
b02c999a RW |
1212 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1213 | struct gpd_timing_data *td) | |
f721889f | 1214 | { |
c0356db7 | 1215 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1216 | int ret = 0; |
1217 | ||
1218 | dev_dbg(dev, "%s()\n", __func__); | |
1219 | ||
1220 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1221 | return -EINVAL; | |
1222 | ||
f104e1e5 | 1223 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1224 | if (IS_ERR(gpd_data)) |
1225 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1226 | |
ba2bbfbf | 1227 | mutex_lock(&genpd->lock); |
f721889f | 1228 | |
596ba34b RW |
1229 | if (genpd->prepared_count > 0) { |
1230 | ret = -EAGAIN; | |
1231 | goto out; | |
1232 | } | |
1233 | ||
b472c2fa UH |
1234 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1235 | if (ret) | |
1236 | goto out; | |
d79b6fe1 | 1237 | |
14b53064 UH |
1238 | genpd->device_count++; |
1239 | genpd->max_off_time_changed = true; | |
1240 | ||
1d5fcfec | 1241 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1242 | |
f721889f | 1243 | out: |
ba2bbfbf | 1244 | mutex_unlock(&genpd->lock); |
f721889f | 1245 | |
c0356db7 UH |
1246 | if (ret) |
1247 | genpd_free_dev_data(dev, gpd_data); | |
1248 | else | |
1249 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1250 | |
f721889f RW |
1251 | return ret; |
1252 | } | |
1253 | ||
1254 | /** | |
1255 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1256 | * @genpd: PM domain to remove the device from. | |
1257 | * @dev: Device to be removed. | |
1258 | */ | |
1259 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1260 | struct device *dev) | |
1261 | { | |
6ff7bb0d | 1262 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1263 | struct pm_domain_data *pdd; |
efa69025 | 1264 | int ret = 0; |
f721889f RW |
1265 | |
1266 | dev_dbg(dev, "%s()\n", __func__); | |
1267 | ||
df6a0d6f | 1268 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1269 | return -EINVAL; |
1270 | ||
c0356db7 UH |
1271 | /* The above validation also means we have existing domain_data. */ |
1272 | pdd = dev->power.subsys_data->domain_data; | |
1273 | gpd_data = to_gpd_data(pdd); | |
1274 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1275 | ||
ba2bbfbf | 1276 | mutex_lock(&genpd->lock); |
f721889f | 1277 | |
596ba34b RW |
1278 | if (genpd->prepared_count > 0) { |
1279 | ret = -EAGAIN; | |
1280 | goto out; | |
1281 | } | |
1282 | ||
6ff7bb0d RW |
1283 | genpd->device_count--; |
1284 | genpd->max_off_time_changed = true; | |
1285 | ||
d79b6fe1 | 1286 | if (genpd->detach_dev) |
c16561e8 | 1287 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1288 | |
efa69025 | 1289 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1290 | |
ba2bbfbf | 1291 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1292 | |
c1dbe2fb | 1293 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1294 | |
6ff7bb0d | 1295 | return 0; |
f721889f | 1296 | |
596ba34b | 1297 | out: |
ba2bbfbf | 1298 | mutex_unlock(&genpd->lock); |
c0356db7 | 1299 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1300 | |
1301 | return ret; | |
1302 | } | |
1303 | ||
1304 | /** | |
1305 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1306 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1307 | * @subdomain: Subdomain to be added. |
f721889f RW |
1308 | */ |
1309 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1310 | struct generic_pm_domain *subdomain) |
f721889f | 1311 | { |
5063ce15 | 1312 | struct gpd_link *link; |
f721889f RW |
1313 | int ret = 0; |
1314 | ||
fb7268be RW |
1315 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1316 | || genpd == subdomain) | |
f721889f RW |
1317 | return -EINVAL; |
1318 | ||
ba2bbfbf | 1319 | mutex_lock(&genpd->lock); |
bc0403ff | 1320 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1321 | |
17b75eca | 1322 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1323 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1324 | ret = -EINVAL; |
1325 | goto out; | |
1326 | } | |
1327 | ||
4fcac10d | 1328 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1329 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1330 | ret = -EINVAL; |
1331 | goto out; | |
1332 | } | |
1333 | } | |
1334 | ||
5063ce15 RW |
1335 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1336 | if (!link) { | |
1337 | ret = -ENOMEM; | |
1338 | goto out; | |
1339 | } | |
1340 | link->master = genpd; | |
1341 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1342 | link->slave = subdomain; |
1343 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1344 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1345 | genpd_sd_counter_inc(genpd); |
f721889f | 1346 | |
f721889f | 1347 | out: |
bc0403ff | 1348 | mutex_unlock(&subdomain->lock); |
ba2bbfbf | 1349 | mutex_unlock(&genpd->lock); |
f721889f RW |
1350 | |
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | /** | |
1355 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1356 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1357 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1358 | */ |
1359 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1360 | struct generic_pm_domain *subdomain) |
f721889f | 1361 | { |
5063ce15 | 1362 | struct gpd_link *link; |
f721889f RW |
1363 | int ret = -EINVAL; |
1364 | ||
5063ce15 | 1365 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1366 | return -EINVAL; |
1367 | ||
ba2bbfbf | 1368 | mutex_lock(&genpd->lock); |
f721889f | 1369 | |
30e7a65b JH |
1370 | if (!list_empty(&subdomain->slave_links) || subdomain->device_count) { |
1371 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, | |
1372 | subdomain->name); | |
1373 | ret = -EBUSY; | |
1374 | goto out; | |
1375 | } | |
1376 | ||
5063ce15 RW |
1377 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1378 | if (link->slave != subdomain) | |
f721889f RW |
1379 | continue; |
1380 | ||
1381 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1382 | ||
5063ce15 RW |
1383 | list_del(&link->master_node); |
1384 | list_del(&link->slave_node); | |
1385 | kfree(link); | |
17b75eca | 1386 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1387 | genpd_sd_counter_dec(genpd); |
1388 | ||
1389 | mutex_unlock(&subdomain->lock); | |
1390 | ||
1391 | ret = 0; | |
1392 | break; | |
1393 | } | |
1394 | ||
30e7a65b | 1395 | out: |
ba2bbfbf | 1396 | mutex_unlock(&genpd->lock); |
f721889f RW |
1397 | |
1398 | return ret; | |
1399 | } | |
1400 | ||
d23b9b00 RW |
1401 | /* Default device callbacks for generic PM domains. */ |
1402 | ||
ecf00475 | 1403 | /** |
12e10bb6 | 1404 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1405 | * @dev: Device to handle. |
1406 | */ | |
1407 | static int pm_genpd_default_save_state(struct device *dev) | |
1408 | { | |
1409 | int (*cb)(struct device *__dev); | |
ecf00475 | 1410 | |
0b589741 RW |
1411 | if (dev->type && dev->type->pm) |
1412 | cb = dev->type->pm->runtime_suspend; | |
1413 | else if (dev->class && dev->class->pm) | |
1414 | cb = dev->class->pm->runtime_suspend; | |
1415 | else if (dev->bus && dev->bus->pm) | |
1416 | cb = dev->bus->pm->runtime_suspend; | |
1417 | else | |
1418 | cb = NULL; | |
ecf00475 | 1419 | |
0b589741 RW |
1420 | if (!cb && dev->driver && dev->driver->pm) |
1421 | cb = dev->driver->pm->runtime_suspend; | |
1422 | ||
1423 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1424 | } |
1425 | ||
1426 | /** | |
12e10bb6 | 1427 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1428 | * @dev: Device to handle. |
1429 | */ | |
1430 | static int pm_genpd_default_restore_state(struct device *dev) | |
1431 | { | |
1432 | int (*cb)(struct device *__dev); | |
ecf00475 | 1433 | |
0b589741 RW |
1434 | if (dev->type && dev->type->pm) |
1435 | cb = dev->type->pm->runtime_resume; | |
1436 | else if (dev->class && dev->class->pm) | |
1437 | cb = dev->class->pm->runtime_resume; | |
1438 | else if (dev->bus && dev->bus->pm) | |
1439 | cb = dev->bus->pm->runtime_resume; | |
1440 | else | |
1441 | cb = NULL; | |
ecf00475 | 1442 | |
0b589741 RW |
1443 | if (!cb && dev->driver && dev->driver->pm) |
1444 | cb = dev->driver->pm->runtime_resume; | |
1445 | ||
1446 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1447 | } |
1448 | ||
f721889f RW |
1449 | /** |
1450 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1451 | * @genpd: PM domain object to initialize. | |
1452 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1453 | * @is_off: Initial value of the domain's power_is_off field. | |
1454 | */ | |
1455 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1456 | struct dev_power_governor *gov, bool is_off) | |
1457 | { | |
1458 | if (IS_ERR_OR_NULL(genpd)) | |
1459 | return; | |
1460 | ||
5063ce15 RW |
1461 | INIT_LIST_HEAD(&genpd->master_links); |
1462 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1463 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1464 | mutex_init(&genpd->lock); |
1465 | genpd->gov = gov; | |
1466 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1467 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1468 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1469 | genpd->device_count = 0; |
221e9b58 | 1470 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1471 | genpd->max_off_time_changed = true; |
f721889f RW |
1472 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1473 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1474 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1475 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1476 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1477 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1478 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1479 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1480 | genpd->domain.ops.resume = pm_genpd_resume; |
1481 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1482 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1483 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1484 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1485 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1486 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1487 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1488 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1489 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1490 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1491 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1492 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1493 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1494 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1495 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1496 | |
1497 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1498 | genpd->dev_ops.stop = pm_clk_suspend; | |
1499 | genpd->dev_ops.start = pm_clk_resume; | |
1500 | } | |
1501 | ||
5125bbf3 RW |
1502 | mutex_lock(&gpd_list_lock); |
1503 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1504 | mutex_unlock(&gpd_list_lock); | |
1505 | } | |
be5ed55d | 1506 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1507 | |
1508 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1509 | /* | |
1510 | * Device Tree based PM domain providers. | |
1511 | * | |
1512 | * The code below implements generic device tree based PM domain providers that | |
1513 | * bind device tree nodes with generic PM domains registered in the system. | |
1514 | * | |
1515 | * Any driver that registers generic PM domains and needs to support binding of | |
1516 | * devices to these domains is supposed to register a PM domain provider, which | |
1517 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1518 | * | |
1519 | * Two simple mapping functions have been provided for convenience: | |
1520 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1521 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1522 | * index. | |
1523 | */ | |
1524 | ||
1525 | /** | |
1526 | * struct of_genpd_provider - PM domain provider registration structure | |
1527 | * @link: Entry in global list of PM domain providers | |
1528 | * @node: Pointer to device tree node of PM domain provider | |
1529 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1530 | * into a PM domain. | |
1531 | * @data: context pointer to be passed into @xlate callback | |
1532 | */ | |
1533 | struct of_genpd_provider { | |
1534 | struct list_head link; | |
1535 | struct device_node *node; | |
1536 | genpd_xlate_t xlate; | |
1537 | void *data; | |
1538 | }; | |
1539 | ||
1540 | /* List of registered PM domain providers. */ | |
1541 | static LIST_HEAD(of_genpd_providers); | |
1542 | /* Mutex to protect the list above. */ | |
1543 | static DEFINE_MUTEX(of_genpd_mutex); | |
1544 | ||
1545 | /** | |
1546 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1547 | * @genpdspec: OF phandle args to map into a PM domain | |
1548 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1549 | * | |
1550 | * This is a generic xlate function that can be used to model PM domains that | |
1551 | * have their own device tree nodes. The private data of xlate function needs | |
1552 | * to be a valid pointer to struct generic_pm_domain. | |
1553 | */ | |
1554 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1555 | struct of_phandle_args *genpdspec, | |
1556 | void *data) | |
1557 | { | |
1558 | if (genpdspec->args_count != 0) | |
1559 | return ERR_PTR(-EINVAL); | |
1560 | return data; | |
1561 | } | |
1562 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1563 | ||
1564 | /** | |
1565 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1566 | * @genpdspec: OF phandle args to map into a PM domain | |
1567 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1568 | * | |
1569 | * This is a generic xlate function that can be used to model simple PM domain | |
1570 | * controllers that have one device tree node and provide multiple PM domains. | |
1571 | * A single cell is used as an index into an array of PM domains specified in | |
1572 | * the genpd_onecell_data struct when registering the provider. | |
1573 | */ | |
1574 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1575 | struct of_phandle_args *genpdspec, | |
1576 | void *data) | |
1577 | { | |
1578 | struct genpd_onecell_data *genpd_data = data; | |
1579 | unsigned int idx = genpdspec->args[0]; | |
1580 | ||
1581 | if (genpdspec->args_count != 1) | |
1582 | return ERR_PTR(-EINVAL); | |
1583 | ||
1584 | if (idx >= genpd_data->num_domains) { | |
1585 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1586 | return ERR_PTR(-EINVAL); | |
1587 | } | |
1588 | ||
1589 | if (!genpd_data->domains[idx]) | |
1590 | return ERR_PTR(-ENOENT); | |
1591 | ||
1592 | return genpd_data->domains[idx]; | |
1593 | } | |
1594 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1595 | ||
1596 | /** | |
1597 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1598 | * @np: Device node pointer associated with the PM domain provider. | |
1599 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1600 | * @data: Context pointer for @xlate callback. | |
1601 | */ | |
1602 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1603 | void *data) | |
1604 | { | |
1605 | struct of_genpd_provider *cp; | |
1606 | ||
1607 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1608 | if (!cp) | |
1609 | return -ENOMEM; | |
1610 | ||
1611 | cp->node = of_node_get(np); | |
1612 | cp->data = data; | |
1613 | cp->xlate = xlate; | |
1614 | ||
1615 | mutex_lock(&of_genpd_mutex); | |
1616 | list_add(&cp->link, &of_genpd_providers); | |
1617 | mutex_unlock(&of_genpd_mutex); | |
1618 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1619 | ||
1620 | return 0; | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1623 | ||
1624 | /** | |
1625 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1626 | * @np: Device node pointer associated with the PM domain provider | |
1627 | */ | |
1628 | void of_genpd_del_provider(struct device_node *np) | |
1629 | { | |
1630 | struct of_genpd_provider *cp; | |
1631 | ||
1632 | mutex_lock(&of_genpd_mutex); | |
1633 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1634 | if (cp->node == np) { | |
1635 | list_del(&cp->link); | |
1636 | of_node_put(cp->node); | |
1637 | kfree(cp); | |
1638 | break; | |
1639 | } | |
1640 | } | |
1641 | mutex_unlock(&of_genpd_mutex); | |
1642 | } | |
1643 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1644 | ||
1645 | /** | |
1646 | * of_genpd_get_from_provider() - Look-up PM domain | |
1647 | * @genpdspec: OF phandle args to use for look-up | |
1648 | * | |
1649 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1650 | * found, uses xlate function of the provider to map phandle args to a PM | |
1651 | * domain. | |
1652 | * | |
1653 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1654 | * on failure. | |
1655 | */ | |
7496fcbe | 1656 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1657 | struct of_phandle_args *genpdspec) |
1658 | { | |
1659 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1660 | struct of_genpd_provider *provider; | |
1661 | ||
1662 | mutex_lock(&of_genpd_mutex); | |
1663 | ||
1664 | /* Check if we have such a provider in our array */ | |
1665 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1666 | if (provider->node == genpdspec->np) | |
1667 | genpd = provider->xlate(genpdspec, provider->data); | |
1668 | if (!IS_ERR(genpd)) | |
1669 | break; | |
1670 | } | |
1671 | ||
1672 | mutex_unlock(&of_genpd_mutex); | |
1673 | ||
1674 | return genpd; | |
1675 | } | |
7496fcbe | 1676 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1677 | |
1678 | /** | |
1679 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1680 | * @dev: Device to detach. |
aa42240a TF |
1681 | * @power_off: Currently not used |
1682 | * | |
1683 | * Try to locate a corresponding generic PM domain, which the device was | |
1684 | * attached to previously. If such is found, the device is detached from it. | |
1685 | */ | |
1686 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1687 | { | |
446d999c | 1688 | struct generic_pm_domain *pd; |
93af5e93 | 1689 | unsigned int i; |
aa42240a TF |
1690 | int ret = 0; |
1691 | ||
446d999c | 1692 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1693 | if (!pd) |
1694 | return; | |
1695 | ||
1696 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1697 | ||
93af5e93 | 1698 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1699 | ret = pm_genpd_remove_device(pd, dev); |
1700 | if (ret != -EAGAIN) | |
1701 | break; | |
93af5e93 GU |
1702 | |
1703 | mdelay(i); | |
aa42240a TF |
1704 | cond_resched(); |
1705 | } | |
1706 | ||
1707 | if (ret < 0) { | |
1708 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1709 | pd->name, ret); | |
1710 | return; | |
1711 | } | |
1712 | ||
1713 | /* Check if PM domain can be powered off after removing this device. */ | |
1714 | genpd_queue_power_off_work(pd); | |
1715 | } | |
1716 | ||
632f7ce3 RK |
1717 | static void genpd_dev_pm_sync(struct device *dev) |
1718 | { | |
1719 | struct generic_pm_domain *pd; | |
1720 | ||
1721 | pd = dev_to_genpd(dev); | |
1722 | if (IS_ERR(pd)) | |
1723 | return; | |
1724 | ||
1725 | genpd_queue_power_off_work(pd); | |
1726 | } | |
1727 | ||
aa42240a TF |
1728 | /** |
1729 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1730 | * @dev: Device to attach. | |
1731 | * | |
1732 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1733 | * attaches the device to retrieved pm_domain ops. | |
1734 | * | |
1735 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1736 | * backwards compatibility with existing DTBs. | |
1737 | * | |
311fa6ad JH |
1738 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1739 | * that if a power-domain exists for the device, but it cannot be found or | |
1740 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1741 | * probed and to re-try again later. | |
aa42240a TF |
1742 | */ |
1743 | int genpd_dev_pm_attach(struct device *dev) | |
1744 | { | |
1745 | struct of_phandle_args pd_args; | |
1746 | struct generic_pm_domain *pd; | |
93af5e93 | 1747 | unsigned int i; |
aa42240a TF |
1748 | int ret; |
1749 | ||
1750 | if (!dev->of_node) | |
1751 | return -ENODEV; | |
1752 | ||
1753 | if (dev->pm_domain) | |
1754 | return -EEXIST; | |
1755 | ||
1756 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1757 | "#power-domain-cells", 0, &pd_args); | |
1758 | if (ret < 0) { | |
1759 | if (ret != -ENOENT) | |
1760 | return ret; | |
1761 | ||
1762 | /* | |
1763 | * Try legacy Samsung-specific bindings | |
1764 | * (for backwards compatibility of DT ABI) | |
1765 | */ | |
1766 | pd_args.args_count = 0; | |
1767 | pd_args.np = of_parse_phandle(dev->of_node, | |
1768 | "samsung,power-domain", 0); | |
1769 | if (!pd_args.np) | |
1770 | return -ENOENT; | |
1771 | } | |
1772 | ||
1773 | pd = of_genpd_get_from_provider(&pd_args); | |
1774 | if (IS_ERR(pd)) { | |
1775 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1776 | __func__, PTR_ERR(pd)); | |
1777 | of_node_put(dev->of_node); | |
311fa6ad | 1778 | return -EPROBE_DEFER; |
aa42240a TF |
1779 | } |
1780 | ||
1781 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1782 | ||
93af5e93 | 1783 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1784 | ret = pm_genpd_add_device(pd, dev); |
1785 | if (ret != -EAGAIN) | |
1786 | break; | |
93af5e93 GU |
1787 | |
1788 | mdelay(i); | |
aa42240a TF |
1789 | cond_resched(); |
1790 | } | |
1791 | ||
1792 | if (ret < 0) { | |
1793 | dev_err(dev, "failed to add to PM domain %s: %d", | |
1794 | pd->name, ret); | |
1795 | of_node_put(dev->of_node); | |
311fa6ad | 1796 | goto out; |
aa42240a TF |
1797 | } |
1798 | ||
1799 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 1800 | dev->pm_domain->sync = genpd_dev_pm_sync; |
7420aa4f | 1801 | ret = genpd_poweron(pd); |
aa42240a | 1802 | |
311fa6ad JH |
1803 | out: |
1804 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
1805 | } |
1806 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 1807 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
1808 | |
1809 | ||
1810 | /*** debugfs support ***/ | |
1811 | ||
1812 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
1813 | #include <linux/pm.h> | |
1814 | #include <linux/device.h> | |
1815 | #include <linux/debugfs.h> | |
1816 | #include <linux/seq_file.h> | |
1817 | #include <linux/init.h> | |
1818 | #include <linux/kobject.h> | |
1819 | static struct dentry *pm_genpd_debugfs_dir; | |
1820 | ||
1821 | /* | |
1822 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 1823 | * from sysfs.c, so generalize it. |
2bd5306a | 1824 | */ |
2bd5306a MM |
1825 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
1826 | { | |
1827 | static const char * const status_lookup[] = { | |
1828 | [RPM_ACTIVE] = "active", | |
1829 | [RPM_RESUMING] = "resuming", | |
1830 | [RPM_SUSPENDED] = "suspended", | |
1831 | [RPM_SUSPENDING] = "suspending" | |
1832 | }; | |
1833 | const char *p = ""; | |
1834 | ||
1835 | if (dev->power.runtime_error) | |
1836 | p = "error"; | |
1837 | else if (dev->power.disable_depth) | |
1838 | p = "unsupported"; | |
1839 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
1840 | p = status_lookup[dev->power.runtime_status]; | |
1841 | else | |
1842 | WARN_ON(1); | |
1843 | ||
1844 | seq_puts(s, p); | |
1845 | } | |
2bd5306a MM |
1846 | |
1847 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 1848 | struct generic_pm_domain *genpd) |
2bd5306a MM |
1849 | { |
1850 | static const char * const status_lookup[] = { | |
1851 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
1852 | [GPD_STATE_POWER_OFF] = "off" |
1853 | }; | |
1854 | struct pm_domain_data *pm_data; | |
1855 | const char *kobj_path; | |
1856 | struct gpd_link *link; | |
1857 | int ret; | |
1858 | ||
66a5ca4b | 1859 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
1860 | if (ret) |
1861 | return -ERESTARTSYS; | |
1862 | ||
66a5ca4b | 1863 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 1864 | goto exit; |
15dec67a | 1865 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
1866 | |
1867 | /* | |
1868 | * Modifications on the list require holding locks on both | |
1869 | * master and slave, so we are safe. | |
66a5ca4b | 1870 | * Also genpd->name is immutable. |
2bd5306a | 1871 | */ |
66a5ca4b | 1872 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 1873 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 1874 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
1875 | seq_puts(s, ", "); |
1876 | } | |
1877 | ||
66a5ca4b | 1878 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
1879 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
1880 | if (kobj_path == NULL) | |
1881 | continue; | |
1882 | ||
1883 | seq_printf(s, "\n %-50s ", kobj_path); | |
1884 | rtpm_status_str(s, pm_data->dev); | |
1885 | kfree(kobj_path); | |
1886 | } | |
1887 | ||
1888 | seq_puts(s, "\n"); | |
1889 | exit: | |
66a5ca4b | 1890 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
1891 | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
1896 | { | |
66a5ca4b | 1897 | struct generic_pm_domain *genpd; |
2bd5306a MM |
1898 | int ret = 0; |
1899 | ||
15dec67a GU |
1900 | seq_puts(s, "domain status slaves\n"); |
1901 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
1902 | seq_puts(s, "----------------------------------------------------------------------\n"); |
1903 | ||
1904 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
1905 | if (ret) | |
1906 | return -ERESTARTSYS; | |
1907 | ||
66a5ca4b KH |
1908 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
1909 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
1910 | if (ret) |
1911 | break; | |
1912 | } | |
1913 | mutex_unlock(&gpd_list_lock); | |
1914 | ||
1915 | return ret; | |
1916 | } | |
1917 | ||
1918 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
1919 | { | |
1920 | return single_open(file, pm_genpd_summary_show, NULL); | |
1921 | } | |
1922 | ||
1923 | static const struct file_operations pm_genpd_summary_fops = { | |
1924 | .open = pm_genpd_summary_open, | |
1925 | .read = seq_read, | |
1926 | .llseek = seq_lseek, | |
1927 | .release = single_release, | |
1928 | }; | |
1929 | ||
1930 | static int __init pm_genpd_debug_init(void) | |
1931 | { | |
1932 | struct dentry *d; | |
1933 | ||
1934 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
1935 | ||
1936 | if (!pm_genpd_debugfs_dir) | |
1937 | return -ENOMEM; | |
1938 | ||
1939 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
1940 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
1941 | if (!d) | |
1942 | return -ENOMEM; | |
1943 | ||
1944 | return 0; | |
1945 | } | |
1946 | late_initcall(pm_genpd_debug_init); | |
1947 | ||
1948 | static void __exit pm_genpd_debug_exit(void) | |
1949 | { | |
1950 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
1951 | } | |
1952 | __exitcall(pm_genpd_debug_exit); | |
1953 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |