1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * OMAP powerdomain control |
4 | * |
5 | * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc. |
6 | * Copyright (C) 2007-2011 Nokia Corporation |
7 | * |
8 | * Written by Paul Walmsley |
9 | * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> |
10 | * State counting code by Tero Kristo <tero.kristo@nokia.com> |
11 | */ |
12 | #undef DEBUG |
13 | |
14 | #include <linux/cpu_pm.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/types.h> |
17 | #include <linux/list.h> |
18 | #include <linux/errno.h> |
19 | #include <linux/string.h> |
20 | #include <linux/spinlock.h> |
21 | #include <trace/events/power.h> |
22 | |
23 | #include "cm2xxx_3xxx.h" |
24 | #include "prcm44xx.h" |
25 | #include "cm44xx.h" |
26 | #include "prm2xxx_3xxx.h" |
27 | #include "prm44xx.h" |
28 | |
29 | #include <asm/cpu.h> |
30 | |
31 | #include "powerdomain.h" |
32 | #include "clockdomain.h" |
33 | #include "voltage.h" |
34 | |
35 | #include "soc.h" |
36 | #include "pm.h" |
37 | |
38 | #define PWRDM_TRACE_STATES_FLAG (1<<31) |
39 | |
40 | static void pwrdms_save_context(void); |
41 | static void pwrdms_restore_context(void); |
42 | |
43 | enum { |
44 | PWRDM_STATE_NOW = 0, |
45 | PWRDM_STATE_PREV, |
46 | }; |
47 | |
48 | /* |
49 | * Types of sleep_switch used internally in omap_set_pwrdm_state() |
50 | * and its associated static functions |
51 | * |
52 | * XXX Better documentation is needed here |
53 | */ |
54 | #define ALREADYACTIVE_SWITCH 0 |
55 | #define FORCEWAKEUP_SWITCH 1 |
56 | #define LOWPOWERSTATE_SWITCH 2 |
57 | |
58 | /* pwrdm_list contains all registered struct powerdomains */ |
59 | static LIST_HEAD(pwrdm_list); |
60 | |
61 | static struct pwrdm_ops *arch_pwrdm; |
62 | |
63 | /* Private functions */ |
64 | |
65 | static struct powerdomain *_pwrdm_lookup(const char *name) |
66 | { |
67 | struct powerdomain *pwrdm, *temp_pwrdm; |
68 | |
69 | pwrdm = NULL; |
70 | |
71 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
72 | if (!strcmp(name, temp_pwrdm->name)) { |
73 | pwrdm = temp_pwrdm; |
74 | break; |
75 | } |
76 | } |
77 | |
78 | return pwrdm; |
79 | } |
80 | |
81 | /** |
82 | * _pwrdm_register - register a powerdomain |
83 | * @pwrdm: struct powerdomain * to register |
84 | * |
85 | * Adds a powerdomain to the internal powerdomain list. Returns |
86 | * -EINVAL if given a null pointer, -EEXIST if a powerdomain is |
87 | * already registered by the provided name, or 0 upon success. |
88 | */ |
89 | static int _pwrdm_register(struct powerdomain *pwrdm) |
90 | { |
91 | int i; |
92 | struct voltagedomain *voltdm; |
93 | |
94 | if (!pwrdm || !pwrdm->name) |
95 | return -EINVAL; |
96 | |
97 | if (cpu_is_omap44xx() && |
98 | pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) { |
99 | pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n" , |
100 | pwrdm->name); |
101 | return -EINVAL; |
102 | } |
103 | |
104 | if (_pwrdm_lookup(name: pwrdm->name)) |
105 | return -EEXIST; |
106 | |
107 | if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm) |
108 | if (!arch_pwrdm->pwrdm_has_voltdm()) |
109 | goto skip_voltdm; |
110 | |
111 | voltdm = voltdm_lookup(name: pwrdm->voltdm.name); |
112 | if (!voltdm) { |
113 | pr_err("powerdomain: %s: voltagedomain %s does not exist\n" , |
114 | pwrdm->name, pwrdm->voltdm.name); |
115 | return -EINVAL; |
116 | } |
117 | pwrdm->voltdm.ptr = voltdm; |
118 | INIT_LIST_HEAD(list: &pwrdm->voltdm_node); |
119 | skip_voltdm: |
120 | spin_lock_init(&pwrdm->_lock); |
121 | |
122 | list_add(new: &pwrdm->node, head: &pwrdm_list); |
123 | |
124 | /* Initialize the powerdomain's state counter */ |
125 | for (i = 0; i < PWRDM_MAX_PWRSTS; i++) |
126 | pwrdm->state_counter[i] = 0; |
127 | |
128 | pwrdm->ret_logic_off_counter = 0; |
129 | for (i = 0; i < pwrdm->banks; i++) |
130 | pwrdm->ret_mem_off_counter[i] = 0; |
131 | |
132 | if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) |
133 | arch_pwrdm->pwrdm_wait_transition(pwrdm); |
134 | pwrdm->state = pwrdm_read_pwrst(pwrdm); |
135 | pwrdm->state_counter[pwrdm->state] = 1; |
136 | |
137 | pr_debug("powerdomain: registered %s\n" , pwrdm->name); |
138 | |
139 | return 0; |
140 | } |
141 | |
142 | static void _update_logic_membank_counters(struct powerdomain *pwrdm) |
143 | { |
144 | int i; |
145 | u8 prev_logic_pwrst, prev_mem_pwrst; |
146 | |
147 | prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm); |
148 | if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) && |
149 | (prev_logic_pwrst == PWRDM_POWER_OFF)) |
150 | pwrdm->ret_logic_off_counter++; |
151 | |
152 | for (i = 0; i < pwrdm->banks; i++) { |
153 | prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, bank: i); |
154 | |
155 | if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) && |
156 | (prev_mem_pwrst == PWRDM_POWER_OFF)) |
157 | pwrdm->ret_mem_off_counter[i]++; |
158 | } |
159 | } |
160 | |
161 | static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) |
162 | { |
163 | |
164 | int prev, next, state, trace_state = 0; |
165 | |
166 | if (pwrdm == NULL) |
167 | return -EINVAL; |
168 | |
169 | state = pwrdm_read_pwrst(pwrdm); |
170 | |
171 | switch (flag) { |
172 | case PWRDM_STATE_NOW: |
173 | prev = pwrdm->state; |
174 | break; |
175 | case PWRDM_STATE_PREV: |
176 | prev = pwrdm_read_prev_pwrst(pwrdm); |
177 | if (prev >= 0 && pwrdm->state != prev) |
178 | pwrdm->state_counter[prev]++; |
179 | if (prev == PWRDM_POWER_RET) |
180 | _update_logic_membank_counters(pwrdm); |
181 | /* |
182 | * If the power domain did not hit the desired state, |
183 | * generate a trace event with both the desired and hit states |
184 | */ |
185 | next = pwrdm_read_next_pwrst(pwrdm); |
186 | if (next != prev) { |
187 | trace_state = (PWRDM_TRACE_STATES_FLAG | |
188 | ((next & OMAP_POWERSTATE_MASK) << 8) | |
189 | ((prev & OMAP_POWERSTATE_MASK) << 0)); |
190 | trace_power_domain_target(name: pwrdm->name, |
191 | state: trace_state, |
192 | raw_smp_processor_id()); |
193 | } |
194 | break; |
195 | default: |
196 | return -EINVAL; |
197 | } |
198 | |
199 | if (state != prev) |
200 | pwrdm->state_counter[state]++; |
201 | |
202 | pm_dbg_update_time(pwrdm, prev); |
203 | |
204 | pwrdm->state = state; |
205 | |
206 | return 0; |
207 | } |
208 | |
209 | static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) |
210 | { |
211 | pwrdm_clear_all_prev_pwrst(pwrdm); |
212 | _pwrdm_state_switch(pwrdm, flag: PWRDM_STATE_NOW); |
213 | return 0; |
214 | } |
215 | |
216 | static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) |
217 | { |
218 | _pwrdm_state_switch(pwrdm, flag: PWRDM_STATE_PREV); |
219 | return 0; |
220 | } |
221 | |
222 | /** |
223 | * _pwrdm_save_clkdm_state_and_activate - prepare for power state change |
224 | * @pwrdm: struct powerdomain * to operate on |
225 | * @curr_pwrst: current power state of @pwrdm |
226 | * @pwrst: power state to switch to |
227 | * |
228 | * Determine whether the powerdomain needs to be turned on before |
229 | * attempting to switch power states. Called by |
230 | * omap_set_pwrdm_state(). NOTE that if the powerdomain contains |
231 | * multiple clockdomains, this code assumes that the first clockdomain |
232 | * supports software-supervised wakeup mode - potentially a problem. |
233 | * Returns the power state switch mode currently in use (see the |
234 | * "Types of sleep_switch" comment above). |
235 | */ |
236 | static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm, |
237 | u8 curr_pwrst, u8 pwrst) |
238 | { |
239 | u8 sleep_switch; |
240 | |
241 | if (curr_pwrst < PWRDM_POWER_ON) { |
242 | if (curr_pwrst > pwrst && |
243 | pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && |
244 | arch_pwrdm->pwrdm_set_lowpwrstchange) { |
245 | sleep_switch = LOWPOWERSTATE_SWITCH; |
246 | } else { |
247 | clkdm_deny_idle_nolock(clkdm: pwrdm->pwrdm_clkdms[0]); |
248 | sleep_switch = FORCEWAKEUP_SWITCH; |
249 | } |
250 | } else { |
251 | sleep_switch = ALREADYACTIVE_SWITCH; |
252 | } |
253 | |
254 | return sleep_switch; |
255 | } |
256 | |
257 | /** |
258 | * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change |
259 | * @pwrdm: struct powerdomain * to operate on |
260 | * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate() |
261 | * |
262 | * Restore the clockdomain state perturbed by |
263 | * _pwrdm_save_clkdm_state_and_activate(), and call the power state |
264 | * bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if |
265 | * the powerdomain contains multiple clockdomains, this assumes that |
266 | * the first associated clockdomain supports either |
267 | * hardware-supervised idle control in the register, or |
268 | * software-supervised sleep. No return value. |
269 | */ |
270 | static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm, |
271 | u8 sleep_switch) |
272 | { |
273 | switch (sleep_switch) { |
274 | case FORCEWAKEUP_SWITCH: |
275 | clkdm_allow_idle_nolock(clkdm: pwrdm->pwrdm_clkdms[0]); |
276 | break; |
277 | case LOWPOWERSTATE_SWITCH: |
278 | if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && |
279 | arch_pwrdm->pwrdm_set_lowpwrstchange) |
280 | arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); |
281 | pwrdm_state_switch_nolock(pwrdm); |
282 | break; |
283 | } |
284 | } |
285 | |
286 | /* Public functions */ |
287 | |
288 | /** |
289 | * pwrdm_register_platform_funcs - register powerdomain implementation fns |
290 | * @po: func pointers for arch specific implementations |
291 | * |
292 | * Register the list of function pointers used to implement the |
293 | * powerdomain functions on different OMAP SoCs. Should be called |
294 | * before any other pwrdm_register*() function. Returns -EINVAL if |
295 | * @po is null, -EEXIST if platform functions have already been |
296 | * registered, or 0 upon success. |
297 | */ |
298 | int pwrdm_register_platform_funcs(struct pwrdm_ops *po) |
299 | { |
300 | if (!po) |
301 | return -EINVAL; |
302 | |
303 | if (arch_pwrdm) |
304 | return -EEXIST; |
305 | |
306 | arch_pwrdm = po; |
307 | |
308 | return 0; |
309 | } |
310 | |
311 | /** |
312 | * pwrdm_register_pwrdms - register SoC powerdomains |
313 | * @ps: pointer to an array of struct powerdomain to register |
314 | * |
315 | * Register the powerdomains available on a particular OMAP SoC. Must |
316 | * be called after pwrdm_register_platform_funcs(). May be called |
317 | * multiple times. Returns -EACCES if called before |
318 | * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is |
319 | * null; or 0 upon success. |
320 | */ |
321 | int pwrdm_register_pwrdms(struct powerdomain **ps) |
322 | { |
323 | struct powerdomain **p = NULL; |
324 | |
325 | if (!arch_pwrdm) |
326 | return -EEXIST; |
327 | |
328 | if (!ps) |
329 | return -EINVAL; |
330 | |
331 | for (p = ps; *p; p++) |
332 | _pwrdm_register(pwrdm: *p); |
333 | |
334 | return 0; |
335 | } |
336 | |
337 | static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v) |
338 | { |
339 | switch (cmd) { |
340 | case CPU_CLUSTER_PM_ENTER: |
341 | if (enable_off_mode) |
342 | pwrdms_save_context(); |
343 | break; |
344 | case CPU_CLUSTER_PM_EXIT: |
345 | if (enable_off_mode) |
346 | pwrdms_restore_context(); |
347 | break; |
348 | } |
349 | |
350 | return NOTIFY_OK; |
351 | } |
352 | |
353 | /** |
354 | * pwrdm_complete_init - set up the powerdomain layer |
355 | * |
356 | * Do whatever is necessary to initialize registered powerdomains and |
357 | * powerdomain code. Currently, this programs the next power state |
358 | * for each powerdomain to ON. This prevents powerdomains from |
359 | * unexpectedly losing context or entering high wakeup latency modes |
360 | * with non-power-management-enabled kernels. Must be called after |
361 | * pwrdm_register_pwrdms(). Returns -EACCES if called before |
362 | * pwrdm_register_pwrdms(), or 0 upon success. |
363 | */ |
364 | int pwrdm_complete_init(void) |
365 | { |
366 | struct powerdomain *temp_p; |
367 | static struct notifier_block nb; |
368 | |
369 | if (list_empty(head: &pwrdm_list)) |
370 | return -EACCES; |
371 | |
372 | list_for_each_entry(temp_p, &pwrdm_list, node) |
373 | pwrdm_set_next_pwrst(pwrdm: temp_p, PWRDM_POWER_ON); |
374 | |
375 | /* Only AM43XX can lose pwrdm context during rtc-ddr suspend */ |
376 | if (soc_is_am43xx()) { |
377 | nb.notifier_call = cpu_notifier; |
378 | cpu_pm_register_notifier(nb: &nb); |
379 | } |
380 | |
381 | return 0; |
382 | } |
383 | |
384 | /** |
385 | * pwrdm_lock - acquire a Linux spinlock on a powerdomain |
386 | * @pwrdm: struct powerdomain * to lock |
387 | * |
388 | * Acquire the powerdomain spinlock on @pwrdm. No return value. |
389 | */ |
390 | void pwrdm_lock(struct powerdomain *pwrdm) |
391 | __acquires(&pwrdm->_lock) |
392 | { |
393 | spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags); |
394 | } |
395 | |
396 | /** |
397 | * pwrdm_unlock - release a Linux spinlock on a powerdomain |
398 | * @pwrdm: struct powerdomain * to unlock |
399 | * |
400 | * Release the powerdomain spinlock on @pwrdm. No return value. |
401 | */ |
402 | void pwrdm_unlock(struct powerdomain *pwrdm) |
403 | __releases(&pwrdm->_lock) |
404 | { |
405 | spin_unlock_irqrestore(lock: &pwrdm->_lock, flags: pwrdm->_lock_flags); |
406 | } |
407 | |
408 | /** |
409 | * pwrdm_lookup - look up a powerdomain by name, return a pointer |
410 | * @name: name of powerdomain |
411 | * |
412 | * Find a registered powerdomain by its name @name. Returns a pointer |
413 | * to the struct powerdomain if found, or NULL otherwise. |
414 | */ |
415 | struct powerdomain *pwrdm_lookup(const char *name) |
416 | { |
417 | struct powerdomain *pwrdm; |
418 | |
419 | if (!name) |
420 | return NULL; |
421 | |
422 | pwrdm = _pwrdm_lookup(name); |
423 | |
424 | return pwrdm; |
425 | } |
426 | |
427 | /** |
428 | * pwrdm_for_each - call function on each registered clockdomain |
429 | * @fn: callback function * |
430 | * |
431 | * Call the supplied function @fn for each registered powerdomain. |
432 | * The callback function @fn can return anything but 0 to bail out |
433 | * early from the iterator. Returns the last return value of the |
434 | * callback function, which should be 0 for success or anything else |
435 | * to indicate failure; or -EINVAL if the function pointer is null. |
436 | */ |
437 | int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), |
438 | void *user) |
439 | { |
440 | struct powerdomain *temp_pwrdm; |
441 | int ret = 0; |
442 | |
443 | if (!fn) |
444 | return -EINVAL; |
445 | |
446 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
447 | ret = (*fn)(temp_pwrdm, user); |
448 | if (ret) |
449 | break; |
450 | } |
451 | |
452 | return ret; |
453 | } |
454 | |
455 | /** |
456 | * pwrdm_add_clkdm - add a clockdomain to a powerdomain |
457 | * @pwrdm: struct powerdomain * to add the clockdomain to |
458 | * @clkdm: struct clockdomain * to associate with a powerdomain |
459 | * |
460 | * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This |
461 | * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if |
462 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; |
463 | * or 0 upon success. |
464 | */ |
465 | int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) |
466 | { |
467 | int i; |
468 | int ret = -EINVAL; |
469 | |
470 | if (!pwrdm || !clkdm) |
471 | return -EINVAL; |
472 | |
473 | pr_debug("powerdomain: %s: associating clockdomain %s\n" , |
474 | pwrdm->name, clkdm->name); |
475 | |
476 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { |
477 | if (!pwrdm->pwrdm_clkdms[i]) |
478 | break; |
479 | #ifdef DEBUG |
480 | if (pwrdm->pwrdm_clkdms[i] == clkdm) { |
481 | ret = -EINVAL; |
482 | goto pac_exit; |
483 | } |
484 | #endif |
485 | } |
486 | |
487 | if (i == PWRDM_MAX_CLKDMS) { |
488 | pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n" , |
489 | pwrdm->name, clkdm->name); |
490 | WARN_ON(1); |
491 | ret = -ENOMEM; |
492 | goto pac_exit; |
493 | } |
494 | |
495 | pwrdm->pwrdm_clkdms[i] = clkdm; |
496 | |
497 | ret = 0; |
498 | |
499 | pac_exit: |
500 | return ret; |
501 | } |
502 | |
503 | /** |
504 | * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain |
505 | * @pwrdm: struct powerdomain * |
506 | * |
507 | * Return the number of controllable memory banks in powerdomain @pwrdm, |
508 | * starting with 1. Returns -EINVAL if the powerdomain pointer is null. |
509 | */ |
510 | int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) |
511 | { |
512 | if (!pwrdm) |
513 | return -EINVAL; |
514 | |
515 | return pwrdm->banks; |
516 | } |
517 | |
518 | /** |
519 | * pwrdm_set_next_pwrst - set next powerdomain power state |
520 | * @pwrdm: struct powerdomain * to set |
521 | * @pwrst: one of the PWRDM_POWER_* macros |
522 | * |
523 | * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain |
524 | * may not enter this state immediately if the preconditions for this state |
525 | * have not been satisfied. Returns -EINVAL if the powerdomain pointer is |
526 | * null or if the power state is invalid for the powerdomin, or returns 0 |
527 | * upon success. |
528 | */ |
529 | int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |
530 | { |
531 | int ret = -EINVAL; |
532 | |
533 | if (!pwrdm) |
534 | return -EINVAL; |
535 | |
536 | if (!(pwrdm->pwrsts & (1 << pwrst))) |
537 | return -EINVAL; |
538 | |
539 | pr_debug("powerdomain: %s: setting next powerstate to %0x\n" , |
540 | pwrdm->name, pwrst); |
541 | |
542 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { |
543 | /* Trace the pwrdm desired target state */ |
544 | trace_power_domain_target(name: pwrdm->name, state: pwrst, |
545 | raw_smp_processor_id()); |
546 | /* Program the pwrdm desired target state */ |
547 | ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); |
548 | } |
549 | |
550 | return ret; |
551 | } |
552 | |
553 | /** |
554 | * pwrdm_read_next_pwrst - get next powerdomain power state |
555 | * @pwrdm: struct powerdomain * to get power state |
556 | * |
557 | * Return the powerdomain @pwrdm's next power state. Returns -EINVAL |
558 | * if the powerdomain pointer is null or returns the next power state |
559 | * upon success. |
560 | */ |
561 | int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) |
562 | { |
563 | int ret = -EINVAL; |
564 | |
565 | if (!pwrdm) |
566 | return -EINVAL; |
567 | |
568 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) |
569 | ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); |
570 | |
571 | return ret; |
572 | } |
573 | |
574 | /** |
575 | * pwrdm_read_pwrst - get current powerdomain power state |
576 | * @pwrdm: struct powerdomain * to get power state |
577 | * |
578 | * Return the powerdomain @pwrdm's current power state. Returns -EINVAL |
579 | * if the powerdomain pointer is null or returns the current power state |
580 | * upon success. Note that if the power domain only supports the ON state |
581 | * then just return ON as the current state. |
582 | */ |
583 | int pwrdm_read_pwrst(struct powerdomain *pwrdm) |
584 | { |
585 | int ret = -EINVAL; |
586 | |
587 | if (!pwrdm) |
588 | return -EINVAL; |
589 | |
590 | if (pwrdm->pwrsts == PWRSTS_ON) |
591 | return PWRDM_POWER_ON; |
592 | |
593 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) |
594 | ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); |
595 | |
596 | return ret; |
597 | } |
598 | |
599 | /** |
600 | * pwrdm_read_prev_pwrst - get previous powerdomain power state |
601 | * @pwrdm: struct powerdomain * to get previous power state |
602 | * |
603 | * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL |
604 | * if the powerdomain pointer is null or returns the previous power state |
605 | * upon success. |
606 | */ |
607 | int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) |
608 | { |
609 | int ret = -EINVAL; |
610 | |
611 | if (!pwrdm) |
612 | return -EINVAL; |
613 | |
614 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) |
615 | ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); |
616 | |
617 | return ret; |
618 | } |
619 | |
620 | /** |
621 | * pwrdm_set_logic_retst - set powerdomain logic power state upon retention |
622 | * @pwrdm: struct powerdomain * to set |
623 | * @pwrst: one of the PWRDM_POWER_* macros |
624 | * |
625 | * Set the next power state @pwrst that the logic portion of the |
626 | * powerdomain @pwrdm will enter when the powerdomain enters retention. |
627 | * This will be either RETENTION or OFF, if supported. Returns |
628 | * -EINVAL if the powerdomain pointer is null or the target power |
629 | * state is not supported, or returns 0 upon success. |
630 | */ |
631 | int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) |
632 | { |
633 | int ret = -EINVAL; |
634 | |
635 | if (!pwrdm) |
636 | return -EINVAL; |
637 | |
638 | if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) |
639 | return -EINVAL; |
640 | |
641 | pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n" , |
642 | pwrdm->name, pwrst); |
643 | |
644 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) |
645 | ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); |
646 | |
647 | return ret; |
648 | } |
649 | |
650 | /** |
651 | * pwrdm_set_mem_onst - set memory power state while powerdomain ON |
652 | * @pwrdm: struct powerdomain * to set |
653 | * @bank: memory bank number to set (0-3) |
654 | * @pwrst: one of the PWRDM_POWER_* macros |
655 | * |
656 | * Set the next power state @pwrst that memory bank @bank of the |
657 | * powerdomain @pwrdm will enter when the powerdomain enters the ON |
658 | * state. @bank will be a number from 0 to 3, and represents different |
659 | * types of memory, depending on the powerdomain. Returns -EINVAL if |
660 | * the powerdomain pointer is null or the target power state is not |
661 | * supported for this memory bank, -EEXIST if the target memory |
662 | * bank does not exist or is not controllable, or returns 0 upon |
663 | * success. |
664 | */ |
665 | int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
666 | { |
667 | int ret = -EINVAL; |
668 | |
669 | if (!pwrdm) |
670 | return -EINVAL; |
671 | |
672 | if (pwrdm->banks < (bank + 1)) |
673 | return -EEXIST; |
674 | |
675 | if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) |
676 | return -EINVAL; |
677 | |
678 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n" , |
679 | pwrdm->name, bank, pwrst); |
680 | |
681 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) |
682 | ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); |
683 | |
684 | return ret; |
685 | } |
686 | |
687 | /** |
688 | * pwrdm_set_mem_retst - set memory power state while powerdomain in RET |
689 | * @pwrdm: struct powerdomain * to set |
690 | * @bank: memory bank number to set (0-3) |
691 | * @pwrst: one of the PWRDM_POWER_* macros |
692 | * |
693 | * Set the next power state @pwrst that memory bank @bank of the |
694 | * powerdomain @pwrdm will enter when the powerdomain enters the |
695 | * RETENTION state. Bank will be a number from 0 to 3, and represents |
696 | * different types of memory, depending on the powerdomain. @pwrst |
697 | * will be either RETENTION or OFF, if supported. Returns -EINVAL if |
698 | * the powerdomain pointer is null or the target power state is not |
699 | * supported for this memory bank, -EEXIST if the target memory |
700 | * bank does not exist or is not controllable, or returns 0 upon |
701 | * success. |
702 | */ |
703 | int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
704 | { |
705 | int ret = -EINVAL; |
706 | |
707 | if (!pwrdm) |
708 | return -EINVAL; |
709 | |
710 | if (pwrdm->banks < (bank + 1)) |
711 | return -EEXIST; |
712 | |
713 | if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) |
714 | return -EINVAL; |
715 | |
716 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n" , |
717 | pwrdm->name, bank, pwrst); |
718 | |
719 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) |
720 | ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); |
721 | |
722 | return ret; |
723 | } |
724 | |
725 | /** |
726 | * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state |
727 | * @pwrdm: struct powerdomain * to get current logic retention power state |
728 | * |
729 | * Return the power state that the logic portion of powerdomain @pwrdm |
730 | * will enter when the powerdomain enters retention. Returns -EINVAL |
731 | * if the powerdomain pointer is null or returns the logic retention |
732 | * power state upon success. |
733 | */ |
734 | int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) |
735 | { |
736 | int ret = -EINVAL; |
737 | |
738 | if (!pwrdm) |
739 | return -EINVAL; |
740 | |
741 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) |
742 | ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); |
743 | |
744 | return ret; |
745 | } |
746 | |
747 | /** |
748 | * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state |
749 | * @pwrdm: struct powerdomain * to get previous logic power state |
750 | * |
751 | * Return the powerdomain @pwrdm's previous logic power state. Returns |
752 | * -EINVAL if the powerdomain pointer is null or returns the previous |
753 | * logic power state upon success. |
754 | */ |
755 | int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) |
756 | { |
757 | int ret = -EINVAL; |
758 | |
759 | if (!pwrdm) |
760 | return -EINVAL; |
761 | |
762 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) |
763 | ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); |
764 | |
765 | return ret; |
766 | } |
767 | |
768 | /** |
769 | * pwrdm_read_logic_retst - get next powerdomain logic power state |
770 | * @pwrdm: struct powerdomain * to get next logic power state |
771 | * |
772 | * Return the powerdomain pwrdm's logic power state. Returns -EINVAL |
773 | * if the powerdomain pointer is null or returns the next logic |
774 | * power state upon success. |
775 | */ |
776 | int pwrdm_read_logic_retst(struct powerdomain *pwrdm) |
777 | { |
778 | int ret = -EINVAL; |
779 | |
780 | if (!pwrdm) |
781 | return -EINVAL; |
782 | |
783 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) |
784 | ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); |
785 | |
786 | return ret; |
787 | } |
788 | |
789 | /** |
790 | * pwrdm_read_mem_pwrst - get current memory bank power state |
791 | * @pwrdm: struct powerdomain * to get current memory bank power state |
792 | * @bank: memory bank number (0-3) |
793 | * |
794 | * Return the powerdomain @pwrdm's current memory power state for bank |
795 | * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
796 | * the target memory bank does not exist or is not controllable, or |
797 | * returns the current memory power state upon success. |
798 | */ |
799 | int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
800 | { |
801 | int ret = -EINVAL; |
802 | |
803 | if (!pwrdm) |
804 | return ret; |
805 | |
806 | if (pwrdm->banks < (bank + 1)) |
807 | return ret; |
808 | |
809 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
810 | bank = 1; |
811 | |
812 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) |
813 | ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); |
814 | |
815 | return ret; |
816 | } |
817 | |
818 | /** |
819 | * pwrdm_read_prev_mem_pwrst - get previous memory bank power state |
820 | * @pwrdm: struct powerdomain * to get previous memory bank power state |
821 | * @bank: memory bank number (0-3) |
822 | * |
823 | * Return the powerdomain @pwrdm's previous memory power state for |
824 | * bank @bank. Returns -EINVAL if the powerdomain pointer is null, |
825 | * -EEXIST if the target memory bank does not exist or is not |
826 | * controllable, or returns the previous memory power state upon |
827 | * success. |
828 | */ |
829 | int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
830 | { |
831 | int ret = -EINVAL; |
832 | |
833 | if (!pwrdm) |
834 | return ret; |
835 | |
836 | if (pwrdm->banks < (bank + 1)) |
837 | return ret; |
838 | |
839 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
840 | bank = 1; |
841 | |
842 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) |
843 | ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); |
844 | |
845 | return ret; |
846 | } |
847 | |
848 | /** |
849 | * pwrdm_read_mem_retst - get next memory bank power state |
850 | * @pwrdm: struct powerdomain * to get mext memory bank power state |
851 | * @bank: memory bank number (0-3) |
852 | * |
853 | * Return the powerdomain pwrdm's next memory power state for bank |
854 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
855 | * the target memory bank does not exist or is not controllable, or |
856 | * returns the next memory power state upon success. |
857 | */ |
858 | int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) |
859 | { |
860 | int ret = -EINVAL; |
861 | |
862 | if (!pwrdm) |
863 | return ret; |
864 | |
865 | if (pwrdm->banks < (bank + 1)) |
866 | return ret; |
867 | |
868 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) |
869 | ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); |
870 | |
871 | return ret; |
872 | } |
873 | |
874 | /** |
875 | * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm |
876 | * @pwrdm: struct powerdomain * to clear |
877 | * |
878 | * Clear the powerdomain's previous power state register @pwrdm. |
879 | * Clears the entire register, including logic and memory bank |
880 | * previous power states. Returns -EINVAL if the powerdomain pointer |
881 | * is null, or returns 0 upon success. |
882 | */ |
883 | int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) |
884 | { |
885 | int ret = -EINVAL; |
886 | |
887 | if (!pwrdm) |
888 | return ret; |
889 | |
890 | /* |
891 | * XXX should get the powerdomain's current state here; |
892 | * warn & fail if it is not ON. |
893 | */ |
894 | |
895 | pr_debug("powerdomain: %s: clearing previous power state reg\n" , |
896 | pwrdm->name); |
897 | |
898 | if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) |
899 | ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); |
900 | |
901 | return ret; |
902 | } |
903 | |
904 | /** |
905 | * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm |
906 | * @pwrdm: struct powerdomain * |
907 | * |
908 | * Enable automatic context save-and-restore upon power state change |
909 | * for some devices in the powerdomain @pwrdm. Warning: this only |
910 | * affects a subset of devices in a powerdomain; check the TRM |
911 | * closely. Returns -EINVAL if the powerdomain pointer is null or if |
912 | * the powerdomain does not support automatic save-and-restore, or |
913 | * returns 0 upon success. |
914 | */ |
915 | int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) |
916 | { |
917 | int ret = -EINVAL; |
918 | |
919 | if (!pwrdm) |
920 | return ret; |
921 | |
922 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
923 | return ret; |
924 | |
925 | pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n" , pwrdm->name); |
926 | |
927 | if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) |
928 | ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); |
929 | |
930 | return ret; |
931 | } |
932 | |
933 | /** |
934 | * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm |
935 | * @pwrdm: struct powerdomain * |
936 | * |
937 | * Disable automatic context save-and-restore upon power state change |
938 | * for some devices in the powerdomain @pwrdm. Warning: this only |
939 | * affects a subset of devices in a powerdomain; check the TRM |
940 | * closely. Returns -EINVAL if the powerdomain pointer is null or if |
941 | * the powerdomain does not support automatic save-and-restore, or |
942 | * returns 0 upon success. |
943 | */ |
944 | int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) |
945 | { |
946 | int ret = -EINVAL; |
947 | |
948 | if (!pwrdm) |
949 | return ret; |
950 | |
951 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
952 | return ret; |
953 | |
954 | pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n" , pwrdm->name); |
955 | |
956 | if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) |
957 | ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); |
958 | |
959 | return ret; |
960 | } |
961 | |
962 | /** |
963 | * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR |
964 | * @pwrdm: struct powerdomain * |
965 | * |
966 | * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore |
967 | * for some devices, or 0 if it does not. |
968 | */ |
969 | bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) |
970 | { |
971 | return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; |
972 | } |
973 | |
974 | int pwrdm_state_switch_nolock(struct powerdomain *pwrdm) |
975 | { |
976 | int ret; |
977 | |
978 | if (!pwrdm || !arch_pwrdm) |
979 | return -EINVAL; |
980 | |
981 | ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); |
982 | if (!ret) |
983 | ret = _pwrdm_state_switch(pwrdm, flag: PWRDM_STATE_NOW); |
984 | |
985 | return ret; |
986 | } |
987 | |
988 | int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm) |
989 | { |
990 | int ret; |
991 | |
992 | pwrdm_lock(pwrdm); |
993 | ret = pwrdm_state_switch_nolock(pwrdm); |
994 | pwrdm_unlock(pwrdm); |
995 | |
996 | return ret; |
997 | } |
998 | |
999 | int pwrdm_pre_transition(struct powerdomain *pwrdm) |
1000 | { |
1001 | if (pwrdm) |
1002 | _pwrdm_pre_transition_cb(pwrdm, NULL); |
1003 | else |
1004 | pwrdm_for_each(fn: _pwrdm_pre_transition_cb, NULL); |
1005 | |
1006 | return 0; |
1007 | } |
1008 | |
1009 | int pwrdm_post_transition(struct powerdomain *pwrdm) |
1010 | { |
1011 | if (pwrdm) |
1012 | _pwrdm_post_transition_cb(pwrdm, NULL); |
1013 | else |
1014 | pwrdm_for_each(fn: _pwrdm_post_transition_cb, NULL); |
1015 | |
1016 | return 0; |
1017 | } |
1018 | |
1019 | /** |
1020 | * pwrdm_get_valid_lp_state() - Find best match deep power state |
1021 | * @pwrdm: power domain for which we want to find best match |
1022 | * @is_logic_state: Are we looking for logic state match here? Should |
1023 | * be one of PWRDM_xxx macro values |
1024 | * @req_state: requested power state |
1025 | * |
1026 | * Returns: closest match for requested power state. default fallback |
1027 | * is RET for logic state and ON for power state. |
1028 | * |
1029 | * This does a search from the power domain data looking for the |
1030 | * closest valid power domain state that the hardware can achieve. |
1031 | * PRCM definitions for PWRSTCTRL allows us to program whatever |
1032 | * configuration we'd like, and PRCM will actually attempt such |
1033 | * a transition, however if the powerdomain does not actually support it, |
1034 | * we endup with a hung system. The valid power domain states are already |
1035 | * available in our powerdomain data files. So this function tries to do |
1036 | * the following: |
1037 | * a) find if we have an exact match to the request - no issues. |
1038 | * b) else find if a deeper power state is possible. |
1039 | * c) failing which, it tries to find closest higher power state for the |
1040 | * request. |
1041 | */ |
1042 | u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm, |
1043 | bool is_logic_state, u8 req_state) |
1044 | { |
1045 | u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret : |
1046 | pwrdm->pwrsts; |
1047 | /* For logic, ret is highest and others, ON is highest */ |
1048 | u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON; |
1049 | u8 new_pwrst; |
1050 | bool found; |
1051 | |
1052 | /* If it is already supported, nothing to search */ |
1053 | if (pwrdm_states & BIT(req_state)) |
1054 | return req_state; |
1055 | |
1056 | if (!req_state) |
1057 | goto up_search; |
1058 | |
1059 | /* |
1060 | * So, we dont have a exact match |
1061 | * Can we get a deeper power state match? |
1062 | */ |
1063 | new_pwrst = req_state - 1; |
1064 | found = true; |
1065 | while (!(pwrdm_states & BIT(new_pwrst))) { |
1066 | /* No match even at OFF? Not available */ |
1067 | if (new_pwrst == PWRDM_POWER_OFF) { |
1068 | found = false; |
1069 | break; |
1070 | } |
1071 | new_pwrst--; |
1072 | } |
1073 | |
1074 | if (found) |
1075 | goto done; |
1076 | |
1077 | up_search: |
1078 | /* OK, no deeper ones, can we get a higher match? */ |
1079 | new_pwrst = req_state + 1; |
1080 | while (!(pwrdm_states & BIT(new_pwrst))) { |
1081 | if (new_pwrst > PWRDM_POWER_ON) { |
1082 | WARN(1, "powerdomain: %s: Fix max powerstate to ON\n" , |
1083 | pwrdm->name); |
1084 | return PWRDM_POWER_ON; |
1085 | } |
1086 | |
1087 | if (new_pwrst == default_pwrst) |
1088 | break; |
1089 | new_pwrst++; |
1090 | } |
1091 | done: |
1092 | return new_pwrst; |
1093 | } |
1094 | |
1095 | /** |
1096 | * omap_set_pwrdm_state - change a powerdomain's current power state |
1097 | * @pwrdm: struct powerdomain * to change the power state of |
1098 | * @pwrst: power state to change to |
1099 | * |
1100 | * Change the current hardware power state of the powerdomain |
1101 | * represented by @pwrdm to the power state represented by @pwrst. |
1102 | * Returns -EINVAL if @pwrdm is null or invalid or if the |
1103 | * powerdomain's current power state could not be read, or returns 0 |
1104 | * upon success or if @pwrdm does not support @pwrst or any |
1105 | * lower-power state. XXX Should not return 0 if the @pwrdm does not |
1106 | * support @pwrst or any lower-power state: this should be an error. |
1107 | */ |
1108 | int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst) |
1109 | { |
1110 | u8 next_pwrst, sleep_switch; |
1111 | int curr_pwrst; |
1112 | int ret = 0; |
1113 | |
1114 | if (!pwrdm || IS_ERR(ptr: pwrdm)) |
1115 | return -EINVAL; |
1116 | |
1117 | while (!(pwrdm->pwrsts & (1 << pwrst))) { |
1118 | if (pwrst == PWRDM_POWER_OFF) |
1119 | return ret; |
1120 | pwrst--; |
1121 | } |
1122 | |
1123 | pwrdm_lock(pwrdm); |
1124 | |
1125 | curr_pwrst = pwrdm_read_pwrst(pwrdm); |
1126 | if (curr_pwrst < 0) { |
1127 | ret = -EINVAL; |
1128 | goto osps_out; |
1129 | } |
1130 | |
1131 | next_pwrst = pwrdm_read_next_pwrst(pwrdm); |
1132 | if (curr_pwrst == pwrst && next_pwrst == pwrst) |
1133 | goto osps_out; |
1134 | |
1135 | sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst, |
1136 | pwrst); |
1137 | |
1138 | ret = pwrdm_set_next_pwrst(pwrdm, pwrst); |
1139 | if (ret) |
1140 | pr_err("%s: unable to set power state of powerdomain: %s\n" , |
1141 | __func__, pwrdm->name); |
1142 | |
1143 | _pwrdm_restore_clkdm_state(pwrdm, sleep_switch); |
1144 | |
1145 | osps_out: |
1146 | pwrdm_unlock(pwrdm); |
1147 | |
1148 | return ret; |
1149 | } |
1150 | |
1151 | /** |
1152 | * pwrdm_save_context - save powerdomain registers |
1153 | * |
1154 | * Register state is going to be lost due to a suspend or hibernate |
1155 | * event. Save the powerdomain registers. |
1156 | */ |
1157 | static int pwrdm_save_context(struct powerdomain *pwrdm, void *unused) |
1158 | { |
1159 | if (arch_pwrdm && arch_pwrdm->pwrdm_save_context) |
1160 | arch_pwrdm->pwrdm_save_context(pwrdm); |
1161 | return 0; |
1162 | } |
1163 | |
1164 | /** |
1165 | * pwrdm_save_context - restore powerdomain registers |
1166 | * |
1167 | * Restore powerdomain control registers after a suspend or resume |
1168 | * event. |
1169 | */ |
1170 | static int pwrdm_restore_context(struct powerdomain *pwrdm, void *unused) |
1171 | { |
1172 | if (arch_pwrdm && arch_pwrdm->pwrdm_restore_context) |
1173 | arch_pwrdm->pwrdm_restore_context(pwrdm); |
1174 | return 0; |
1175 | } |
1176 | |
1177 | static void pwrdms_save_context(void) |
1178 | { |
1179 | pwrdm_for_each(fn: pwrdm_save_context, NULL); |
1180 | } |
1181 | |
1182 | static void pwrdms_restore_context(void) |
1183 | { |
1184 | pwrdm_for_each(fn: pwrdm_restore_context, NULL); |
1185 | } |
1186 | |