2 * OMAP powerdomain control
4 * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
5 * Copyright (C) 2007-2011 Nokia Corporation
7 * Written by Paul Walmsley
8 * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
9 * State counting code by Tero Kristo <tero.kristo@nokia.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/list.h>
20 #include <linux/errno.h>
21 #include <linux/string.h>
22 #include <linux/spinlock.h>
23 #include <trace/events/power.h>
25 #include "cm2xxx_3xxx.h"
28 #include "prm2xxx_3xxx.h"
33 #include "powerdomain.h"
34 #include "clockdomain.h"
40 #define PWRDM_TRACE_STATES_FLAG (1<<31)
48 * Types of sleep_switch used internally in omap_set_pwrdm_state()
49 * and its associated static functions
51 * XXX Better documentation is needed here
53 #define ALREADYACTIVE_SWITCH 0
54 #define FORCEWAKEUP_SWITCH 1
55 #define LOWPOWERSTATE_SWITCH 2
57 /* pwrdm_list contains all registered struct powerdomains */
58 static LIST_HEAD(pwrdm_list);
60 static struct pwrdm_ops *arch_pwrdm;
62 /* Private functions */
64 static struct powerdomain *_pwrdm_lookup(const char *name)
66 struct powerdomain *pwrdm, *temp_pwrdm;
70 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
71 if (!strcmp(name, temp_pwrdm->name)) {
81 * _pwrdm_register - register a powerdomain
82 * @pwrdm: struct powerdomain * to register
84 * Adds a powerdomain to the internal powerdomain list. Returns
85 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
86 * already registered by the provided name, or 0 upon success.
88 static int _pwrdm_register(struct powerdomain *pwrdm)
91 struct voltagedomain *voltdm;
93 if (!pwrdm || !pwrdm->name)
96 if (cpu_is_omap44xx() &&
97 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
98 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
103 if (_pwrdm_lookup(pwrdm->name))
106 if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
107 if (!arch_pwrdm->pwrdm_has_voltdm())
110 voltdm = voltdm_lookup(pwrdm->voltdm.name);
112 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
113 pwrdm->name, pwrdm->voltdm.name);
116 pwrdm->voltdm.ptr = voltdm;
117 INIT_LIST_HEAD(&pwrdm->voltdm_node);
118 voltdm_add_pwrdm(voltdm, pwrdm);
120 spin_lock_init(&pwrdm->_lock);
122 list_add(&pwrdm->node, &pwrdm_list);
124 /* Initialize the powerdomain's state counter */
125 for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
126 pwrdm->state_counter[i] = 0;
128 pwrdm->ret_logic_off_counter = 0;
129 for (i = 0; i < pwrdm->banks; i++)
130 pwrdm->ret_mem_off_counter[i] = 0;
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;
137 pr_debug("powerdomain: registered %s\n", pwrdm->name);
142 static void _update_logic_membank_counters(struct powerdomain *pwrdm)
145 u8 prev_logic_pwrst, prev_mem_pwrst;
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++;
152 for (i = 0; i < pwrdm->banks; i++) {
153 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
155 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
156 (prev_mem_pwrst == PWRDM_POWER_OFF))
157 pwrdm->ret_mem_off_counter[i]++;
161 static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
164 int prev, next, state, trace_state = 0;
169 state = pwrdm_read_pwrst(pwrdm);
172 case PWRDM_STATE_NOW:
175 case PWRDM_STATE_PREV:
176 prev = pwrdm_read_prev_pwrst(pwrdm);
177 if (pwrdm->state != prev)
178 pwrdm->state_counter[prev]++;
179 if (prev == PWRDM_POWER_RET)
180 _update_logic_membank_counters(pwrdm);
182 * If the power domain did not hit the desired state,
183 * generate a trace event with both the desired and hit states
185 next = pwrdm_read_next_pwrst(pwrdm);
187 trace_state = (PWRDM_TRACE_STATES_FLAG |
188 ((next & OMAP_POWERSTATE_MASK) << 8) |
189 ((prev & OMAP_POWERSTATE_MASK) << 0));
190 trace_power_domain_target(pwrdm->name, trace_state,
199 pwrdm->state_counter[state]++;
201 pm_dbg_update_time(pwrdm, prev);
203 pwrdm->state = state;
208 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
210 pwrdm_clear_all_prev_pwrst(pwrdm);
211 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
215 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
217 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
222 * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
223 * @pwrdm: struct powerdomain * to operate on
224 * @curr_pwrst: current power state of @pwrdm
225 * @pwrst: power state to switch to
226 * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised
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).
236 static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
237 u8 curr_pwrst, u8 pwrst,
242 if (curr_pwrst < PWRDM_POWER_ON) {
243 if (curr_pwrst > pwrst &&
244 pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
245 arch_pwrdm->pwrdm_set_lowpwrstchange) {
246 sleep_switch = LOWPOWERSTATE_SWITCH;
248 *hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
249 clkdm_wakeup_nolock(pwrdm->pwrdm_clkdms[0]);
250 sleep_switch = FORCEWAKEUP_SWITCH;
253 sleep_switch = ALREADYACTIVE_SWITCH;
260 * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
261 * @pwrdm: struct powerdomain * to operate on
262 * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
263 * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode?
265 * Restore the clockdomain state perturbed by
266 * _pwrdm_save_clkdm_state_and_activate(), and call the power state
267 * bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if
268 * the powerdomain contains multiple clockdomains, this assumes that
269 * the first associated clockdomain supports either
270 * hardware-supervised idle control in the register, or
271 * software-supervised sleep. No return value.
273 static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
274 u8 sleep_switch, bool hwsup)
276 switch (sleep_switch) {
277 case FORCEWAKEUP_SWITCH:
279 clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
281 clkdm_sleep_nolock(pwrdm->pwrdm_clkdms[0]);
283 case LOWPOWERSTATE_SWITCH:
284 if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
285 arch_pwrdm->pwrdm_set_lowpwrstchange)
286 arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
287 pwrdm_state_switch_nolock(pwrdm);
292 /* Public functions */
295 * pwrdm_register_platform_funcs - register powerdomain implementation fns
296 * @po: func pointers for arch specific implementations
298 * Register the list of function pointers used to implement the
299 * powerdomain functions on different OMAP SoCs. Should be called
300 * before any other pwrdm_register*() function. Returns -EINVAL if
301 * @po is null, -EEXIST if platform functions have already been
302 * registered, or 0 upon success.
304 int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
318 * pwrdm_register_pwrdms - register SoC powerdomains
319 * @ps: pointer to an array of struct powerdomain to register
321 * Register the powerdomains available on a particular OMAP SoC. Must
322 * be called after pwrdm_register_platform_funcs(). May be called
323 * multiple times. Returns -EACCES if called before
324 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
325 * null; or 0 upon success.
327 int pwrdm_register_pwrdms(struct powerdomain **ps)
329 struct powerdomain **p = NULL;
337 for (p = ps; *p; p++)
344 * pwrdm_complete_init - set up the powerdomain layer
346 * Do whatever is necessary to initialize registered powerdomains and
347 * powerdomain code. Currently, this programs the next power state
348 * for each powerdomain to ON. This prevents powerdomains from
349 * unexpectedly losing context or entering high wakeup latency modes
350 * with non-power-management-enabled kernels. Must be called after
351 * pwrdm_register_pwrdms(). Returns -EACCES if called before
352 * pwrdm_register_pwrdms(), or 0 upon success.
354 int pwrdm_complete_init(void)
356 struct powerdomain *temp_p;
358 if (list_empty(&pwrdm_list))
361 list_for_each_entry(temp_p, &pwrdm_list, node)
362 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
368 * pwrdm_lock - acquire a Linux spinlock on a powerdomain
369 * @pwrdm: struct powerdomain * to lock
371 * Acquire the powerdomain spinlock on @pwrdm. No return value.
373 void pwrdm_lock(struct powerdomain *pwrdm)
374 __acquires(&pwrdm->_lock)
376 spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
380 * pwrdm_unlock - release a Linux spinlock on a powerdomain
381 * @pwrdm: struct powerdomain * to unlock
383 * Release the powerdomain spinlock on @pwrdm. No return value.
385 void pwrdm_unlock(struct powerdomain *pwrdm)
386 __releases(&pwrdm->_lock)
388 spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
392 * pwrdm_lookup - look up a powerdomain by name, return a pointer
393 * @name: name of powerdomain
395 * Find a registered powerdomain by its name @name. Returns a pointer
396 * to the struct powerdomain if found, or NULL otherwise.
398 struct powerdomain *pwrdm_lookup(const char *name)
400 struct powerdomain *pwrdm;
405 pwrdm = _pwrdm_lookup(name);
411 * pwrdm_for_each - call function on each registered clockdomain
412 * @fn: callback function *
414 * Call the supplied function @fn for each registered powerdomain.
415 * The callback function @fn can return anything but 0 to bail out
416 * early from the iterator. Returns the last return value of the
417 * callback function, which should be 0 for success or anything else
418 * to indicate failure; or -EINVAL if the function pointer is null.
420 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
423 struct powerdomain *temp_pwrdm;
429 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
430 ret = (*fn)(temp_pwrdm, user);
439 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
440 * @pwrdm: struct powerdomain * to add the clockdomain to
441 * @clkdm: struct clockdomain * to associate with a powerdomain
443 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
444 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
445 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
448 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
453 if (!pwrdm || !clkdm)
456 pr_debug("powerdomain: %s: associating clockdomain %s\n",
457 pwrdm->name, clkdm->name);
459 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
460 if (!pwrdm->pwrdm_clkdms[i])
463 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
470 if (i == PWRDM_MAX_CLKDMS) {
471 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
472 pwrdm->name, clkdm->name);
478 pwrdm->pwrdm_clkdms[i] = clkdm;
487 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
488 * @pwrdm: struct powerdomain * to add the clockdomain to
489 * @clkdm: struct clockdomain * to associate with a powerdomain
491 * Dissociate the clockdomain @clkdm from the powerdomain
492 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
493 * if @clkdm was not associated with the powerdomain, or 0 upon
496 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
501 if (!pwrdm || !clkdm)
504 pr_debug("powerdomain: %s: dissociating clockdomain %s\n",
505 pwrdm->name, clkdm->name);
507 for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
508 if (pwrdm->pwrdm_clkdms[i] == clkdm)
511 if (i == PWRDM_MAX_CLKDMS) {
512 pr_debug("powerdomain: %s: clkdm %s not associated?!\n",
513 pwrdm->name, clkdm->name);
518 pwrdm->pwrdm_clkdms[i] = NULL;
527 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
528 * @pwrdm: struct powerdomain * to iterate over
529 * @fn: callback function *
531 * Call the supplied function @fn for each clockdomain in the powerdomain
532 * @pwrdm. The callback function can return anything but 0 to bail
533 * out early from the iterator. Returns -EINVAL if presented with
534 * invalid pointers; or passes along the last return value of the
535 * callback function, which should be 0 for success or anything else
536 * to indicate failure.
538 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
539 int (*fn)(struct powerdomain *pwrdm,
540 struct clockdomain *clkdm))
548 for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
549 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
555 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in
556 * @pwrdm: struct powerdomain *
558 * Return a pointer to the struct voltageomain that the specified powerdomain
561 struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm)
563 return pwrdm->voltdm.ptr;
567 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
568 * @pwrdm: struct powerdomain *
570 * Return the number of controllable memory banks in powerdomain @pwrdm,
571 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
573 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
582 * pwrdm_set_next_pwrst - set next powerdomain power state
583 * @pwrdm: struct powerdomain * to set
584 * @pwrst: one of the PWRDM_POWER_* macros
586 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
587 * may not enter this state immediately if the preconditions for this state
588 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
589 * null or if the power state is invalid for the powerdomin, or returns 0
592 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
599 if (!(pwrdm->pwrsts & (1 << pwrst)))
602 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
605 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
606 /* Trace the pwrdm desired target state */
607 trace_power_domain_target(pwrdm->name, pwrst,
609 /* Program the pwrdm desired target state */
610 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
617 * pwrdm_read_next_pwrst - get next powerdomain power state
618 * @pwrdm: struct powerdomain * to get power state
620 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
621 * if the powerdomain pointer is null or returns the next power state
624 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
631 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
632 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
638 * pwrdm_read_pwrst - get current powerdomain power state
639 * @pwrdm: struct powerdomain * to get power state
641 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
642 * if the powerdomain pointer is null or returns the current power state
643 * upon success. Note that if the power domain only supports the ON state
644 * then just return ON as the current state.
646 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
653 if (pwrdm->pwrsts == PWRSTS_ON)
654 return PWRDM_POWER_ON;
656 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
657 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
663 * pwrdm_read_prev_pwrst - get previous powerdomain power state
664 * @pwrdm: struct powerdomain * to get previous power state
666 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
667 * if the powerdomain pointer is null or returns the previous power state
670 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
677 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
678 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
684 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
685 * @pwrdm: struct powerdomain * to set
686 * @pwrst: one of the PWRDM_POWER_* macros
688 * Set the next power state @pwrst that the logic portion of the
689 * powerdomain @pwrdm will enter when the powerdomain enters retention.
690 * This will be either RETENTION or OFF, if supported. Returns
691 * -EINVAL if the powerdomain pointer is null or the target power
692 * state is not not supported, or returns 0 upon success.
694 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
701 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
704 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
707 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
708 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
714 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
715 * @pwrdm: struct powerdomain * to set
716 * @bank: memory bank number to set (0-3)
717 * @pwrst: one of the PWRDM_POWER_* macros
719 * Set the next power state @pwrst that memory bank @bank of the
720 * powerdomain @pwrdm will enter when the powerdomain enters the ON
721 * state. @bank will be a number from 0 to 3, and represents different
722 * types of memory, depending on the powerdomain. Returns -EINVAL if
723 * the powerdomain pointer is null or the target power state is not
724 * not supported for this memory bank, -EEXIST if the target memory
725 * bank does not exist or is not controllable, or returns 0 upon
728 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
735 if (pwrdm->banks < (bank + 1))
738 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
741 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
742 pwrdm->name, bank, pwrst);
744 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
745 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
751 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
752 * @pwrdm: struct powerdomain * to set
753 * @bank: memory bank number to set (0-3)
754 * @pwrst: one of the PWRDM_POWER_* macros
756 * Set the next power state @pwrst that memory bank @bank of the
757 * powerdomain @pwrdm will enter when the powerdomain enters the
758 * RETENTION state. Bank will be a number from 0 to 3, and represents
759 * different types of memory, depending on the powerdomain. @pwrst
760 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
761 * the powerdomain pointer is null or the target power state is not
762 * not supported for this memory bank, -EEXIST if the target memory
763 * bank does not exist or is not controllable, or returns 0 upon
766 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
773 if (pwrdm->banks < (bank + 1))
776 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
779 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
780 pwrdm->name, bank, pwrst);
782 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
783 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
789 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
790 * @pwrdm: struct powerdomain * to get current logic retention power state
792 * Return the power state that the logic portion of powerdomain @pwrdm
793 * will enter when the powerdomain enters retention. Returns -EINVAL
794 * if the powerdomain pointer is null or returns the logic retention
795 * power state upon success.
797 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
804 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
805 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
811 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
812 * @pwrdm: struct powerdomain * to get previous logic power state
814 * Return the powerdomain @pwrdm's previous logic power state. Returns
815 * -EINVAL if the powerdomain pointer is null or returns the previous
816 * logic power state upon success.
818 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
825 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
826 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
832 * pwrdm_read_logic_retst - get next powerdomain logic power state
833 * @pwrdm: struct powerdomain * to get next logic power state
835 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
836 * if the powerdomain pointer is null or returns the next logic
837 * power state upon success.
839 int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
846 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
847 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
853 * pwrdm_read_mem_pwrst - get current memory bank power state
854 * @pwrdm: struct powerdomain * to get current memory bank power state
855 * @bank: memory bank number (0-3)
857 * Return the powerdomain @pwrdm's current memory power state for bank
858 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
859 * the target memory bank does not exist or is not controllable, or
860 * returns the current memory power state upon success.
862 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
869 if (pwrdm->banks < (bank + 1))
872 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
875 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
876 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
882 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
883 * @pwrdm: struct powerdomain * to get previous memory bank power state
884 * @bank: memory bank number (0-3)
886 * Return the powerdomain @pwrdm's previous memory power state for
887 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
888 * -EEXIST if the target memory bank does not exist or is not
889 * controllable, or returns the previous memory power state upon
892 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
899 if (pwrdm->banks < (bank + 1))
902 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
905 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
906 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
912 * pwrdm_read_mem_retst - get next memory bank power state
913 * @pwrdm: struct powerdomain * to get mext memory bank power state
914 * @bank: memory bank number (0-3)
916 * Return the powerdomain pwrdm's next memory power state for bank
917 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
918 * the target memory bank does not exist or is not controllable, or
919 * returns the next memory power state upon success.
921 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
928 if (pwrdm->banks < (bank + 1))
931 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
932 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
938 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
939 * @pwrdm: struct powerdomain * to clear
941 * Clear the powerdomain's previous power state register @pwrdm.
942 * Clears the entire register, including logic and memory bank
943 * previous power states. Returns -EINVAL if the powerdomain pointer
944 * is null, or returns 0 upon success.
946 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
954 * XXX should get the powerdomain's current state here;
955 * warn & fail if it is not ON.
958 pr_debug("powerdomain: %s: clearing previous power state reg\n",
961 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
962 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
968 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
969 * @pwrdm: struct powerdomain *
971 * Enable automatic context save-and-restore upon power state change
972 * for some devices in the powerdomain @pwrdm. Warning: this only
973 * affects a subset of devices in a powerdomain; check the TRM
974 * closely. Returns -EINVAL if the powerdomain pointer is null or if
975 * the powerdomain does not support automatic save-and-restore, or
976 * returns 0 upon success.
978 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
985 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
988 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
990 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
991 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
997 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
998 * @pwrdm: struct powerdomain *
1000 * Disable automatic context save-and-restore upon power state change
1001 * for some devices in the powerdomain @pwrdm. Warning: this only
1002 * affects a subset of devices in a powerdomain; check the TRM
1003 * closely. Returns -EINVAL if the powerdomain pointer is null or if
1004 * the powerdomain does not support automatic save-and-restore, or
1005 * returns 0 upon success.
1007 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
1014 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1017 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
1019 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
1020 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
1026 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1027 * @pwrdm: struct powerdomain *
1029 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
1030 * for some devices, or 0 if it does not.
1032 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
1034 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
1037 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
1041 if (!pwrdm || !arch_pwrdm)
1044 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
1046 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
1051 int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
1056 ret = pwrdm_state_switch_nolock(pwrdm);
1057 pwrdm_unlock(pwrdm);
1062 int pwrdm_pre_transition(struct powerdomain *pwrdm)
1065 _pwrdm_pre_transition_cb(pwrdm, NULL);
1067 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
1072 int pwrdm_post_transition(struct powerdomain *pwrdm)
1075 _pwrdm_post_transition_cb(pwrdm, NULL);
1077 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
1083 * omap_set_pwrdm_state - change a powerdomain's current power state
1084 * @pwrdm: struct powerdomain * to change the power state of
1085 * @pwrst: power state to change to
1087 * Change the current hardware power state of the powerdomain
1088 * represented by @pwrdm to the power state represented by @pwrst.
1089 * Returns -EINVAL if @pwrdm is null or invalid or if the
1090 * powerdomain's current power state could not be read, or returns 0
1091 * upon success or if @pwrdm does not support @pwrst or any
1092 * lower-power state. XXX Should not return 0 if the @pwrdm does not
1093 * support @pwrst or any lower-power state: this should be an error.
1095 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
1097 u8 next_pwrst, sleep_switch;
1102 if (!pwrdm || IS_ERR(pwrdm))
1105 while (!(pwrdm->pwrsts & (1 << pwrst))) {
1106 if (pwrst == PWRDM_POWER_OFF)
1113 curr_pwrst = pwrdm_read_pwrst(pwrdm);
1114 if (curr_pwrst < 0) {
1119 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
1120 if (curr_pwrst == pwrst && next_pwrst == pwrst)
1123 sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
1126 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
1128 pr_err("%s: unable to set power state of powerdomain: %s\n",
1129 __func__, pwrdm->name);
1131 _pwrdm_restore_clkdm_state(pwrdm, sleep_switch, hwsup);
1134 pwrdm_unlock(pwrdm);
1140 * pwrdm_get_context_loss_count - get powerdomain's context loss count
1141 * @pwrdm: struct powerdomain * to wait for
1143 * Context loss count is the sum of powerdomain off-mode counter, the
1144 * logic off counter and the per-bank memory off counter. Returns negative
1145 * (and WARNs) upon error, otherwise, returns the context loss count.
1147 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
1152 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
1156 count = pwrdm->state_counter[PWRDM_POWER_OFF];
1157 count += pwrdm->ret_logic_off_counter;
1159 for (i = 0; i < pwrdm->banks; i++)
1160 count += pwrdm->ret_mem_off_counter[i];
1163 * Context loss count has to be a non-negative value. Clear the sign
1164 * bit to get a value range from 0 to INT_MAX.
1168 pr_debug("powerdomain: %s: context loss count = %d\n",
1169 pwrdm->name, count);
1175 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1176 * @pwrdm: struct powerdomain *
1178 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1179 * can lose either memory or logic context or if @pwrdm is invalid, or
1180 * returns 0 otherwise. This function is not concerned with how the
1181 * powerdomain registers are programmed (i.e., to go off or not); it's
1182 * concerned with whether it's ever possible for this powerdomain to
1183 * go off while some other part of the chip is active. This function
1184 * assumes that every powerdomain can go to either ON or INACTIVE.
1186 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
1191 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1196 if (pwrdm->pwrsts & PWRSTS_OFF)
1199 if (pwrdm->pwrsts & PWRSTS_RET) {
1200 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
1203 for (i = 0; i < pwrdm->banks; i++)
1204 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1208 for (i = 0; i < pwrdm->banks; i++)
1209 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)