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 <trace/events/power.h>
24 #include "cm2xxx_3xxx.h"
27 #include "prm2xxx_3xxx.h"
32 #include "powerdomain.h"
33 #include "clockdomain.h"
34 #include <plat/prcm.h>
38 #define PWRDM_TRACE_STATES_FLAG (1<<31)
46 /* pwrdm_list contains all registered struct powerdomains */
47 static LIST_HEAD(pwrdm_list);
49 static struct pwrdm_ops *arch_pwrdm;
51 /* Private functions */
53 static struct powerdomain *_pwrdm_lookup(const char *name)
55 struct powerdomain *pwrdm, *temp_pwrdm;
59 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
60 if (!strcmp(name, temp_pwrdm->name)) {
70 * _pwrdm_register - register a powerdomain
71 * @pwrdm: struct powerdomain * to register
73 * Adds a powerdomain to the internal powerdomain list. Returns
74 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
75 * already registered by the provided name, or 0 upon success.
77 static int _pwrdm_register(struct powerdomain *pwrdm)
81 if (!pwrdm || !pwrdm->name)
84 if (cpu_is_omap44xx() &&
85 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
86 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
91 if (_pwrdm_lookup(pwrdm->name))
94 list_add(&pwrdm->node, &pwrdm_list);
96 /* Initialize the powerdomain's state counter */
97 for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
98 pwrdm->state_counter[i] = 0;
100 pwrdm->ret_logic_off_counter = 0;
101 for (i = 0; i < pwrdm->banks; i++)
102 pwrdm->ret_mem_off_counter[i] = 0;
104 pwrdm_wait_transition(pwrdm);
105 pwrdm->state = pwrdm_read_pwrst(pwrdm);
106 pwrdm->state_counter[pwrdm->state] = 1;
108 pr_debug("powerdomain: registered %s\n", pwrdm->name);
113 static void _update_logic_membank_counters(struct powerdomain *pwrdm)
116 u8 prev_logic_pwrst, prev_mem_pwrst;
118 prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
119 if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
120 (prev_logic_pwrst == PWRDM_POWER_OFF))
121 pwrdm->ret_logic_off_counter++;
123 for (i = 0; i < pwrdm->banks; i++) {
124 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
126 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
127 (prev_mem_pwrst == PWRDM_POWER_OFF))
128 pwrdm->ret_mem_off_counter[i]++;
132 static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
135 int prev, state, trace_state = 0;
140 state = pwrdm_read_pwrst(pwrdm);
143 case PWRDM_STATE_NOW:
146 case PWRDM_STATE_PREV:
147 prev = pwrdm_read_prev_pwrst(pwrdm);
148 if (pwrdm->state != prev)
149 pwrdm->state_counter[prev]++;
150 if (prev == PWRDM_POWER_RET)
151 _update_logic_membank_counters(pwrdm);
153 * If the power domain did not hit the desired state,
154 * generate a trace event with both the desired and hit states
157 trace_state = (PWRDM_TRACE_STATES_FLAG |
158 ((state & OMAP_POWERSTATE_MASK) << 8) |
159 ((prev & OMAP_POWERSTATE_MASK) << 0));
160 trace_power_domain_target(pwrdm->name, trace_state,
169 pwrdm->state_counter[state]++;
171 pm_dbg_update_time(pwrdm, prev);
173 pwrdm->state = state;
178 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
180 pwrdm_clear_all_prev_pwrst(pwrdm);
181 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
185 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
187 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
191 /* Public functions */
194 * pwrdm_register_platform_funcs - register powerdomain implementation fns
195 * @po: func pointers for arch specific implementations
197 * Register the list of function pointers used to implement the
198 * powerdomain functions on different OMAP SoCs. Should be called
199 * before any other pwrdm_register*() function. Returns -EINVAL if
200 * @po is null, -EEXIST if platform functions have already been
201 * registered, or 0 upon success.
203 int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
217 * pwrdm_register_pwrdms - register SoC powerdomains
218 * @ps: pointer to an array of struct powerdomain to register
220 * Register the powerdomains available on a particular OMAP SoC. Must
221 * be called after pwrdm_register_platform_funcs(). May be called
222 * multiple times. Returns -EACCES if called before
223 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
224 * null; or 0 upon success.
226 int pwrdm_register_pwrdms(struct powerdomain **ps)
228 struct powerdomain **p = NULL;
236 for (p = ps; *p; p++)
243 * pwrdm_complete_init - set up the powerdomain layer
245 * Do whatever is necessary to initialize registered powerdomains and
246 * powerdomain code. Currently, this programs the next power state
247 * for each powerdomain to ON. This prevents powerdomains from
248 * unexpectedly losing context or entering high wakeup latency modes
249 * with non-power-management-enabled kernels. Must be called after
250 * pwrdm_register_pwrdms(). Returns -EACCES if called before
251 * pwrdm_register_pwrdms(), or 0 upon success.
253 int pwrdm_complete_init(void)
255 struct powerdomain *temp_p;
257 if (list_empty(&pwrdm_list))
260 list_for_each_entry(temp_p, &pwrdm_list, node)
261 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
267 * pwrdm_lookup - look up a powerdomain by name, return a pointer
268 * @name: name of powerdomain
270 * Find a registered powerdomain by its name @name. Returns a pointer
271 * to the struct powerdomain if found, or NULL otherwise.
273 struct powerdomain *pwrdm_lookup(const char *name)
275 struct powerdomain *pwrdm;
280 pwrdm = _pwrdm_lookup(name);
286 * pwrdm_for_each - call function on each registered clockdomain
287 * @fn: callback function *
289 * Call the supplied function @fn for each registered powerdomain.
290 * The callback function @fn can return anything but 0 to bail out
291 * early from the iterator. Returns the last return value of the
292 * callback function, which should be 0 for success or anything else
293 * to indicate failure; or -EINVAL if the function pointer is null.
295 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
298 struct powerdomain *temp_pwrdm;
304 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
305 ret = (*fn)(temp_pwrdm, user);
314 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
315 * @pwrdm: struct powerdomain * to add the clockdomain to
316 * @clkdm: struct clockdomain * to associate with a powerdomain
318 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
319 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
320 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
323 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
328 if (!pwrdm || !clkdm)
331 pr_debug("powerdomain: associating clockdomain %s with powerdomain "
332 "%s\n", clkdm->name, pwrdm->name);
334 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
335 if (!pwrdm->pwrdm_clkdms[i])
338 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
345 if (i == PWRDM_MAX_CLKDMS) {
346 pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
347 "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
353 pwrdm->pwrdm_clkdms[i] = clkdm;
362 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
363 * @pwrdm: struct powerdomain * to add the clockdomain to
364 * @clkdm: struct clockdomain * to associate with a powerdomain
366 * Dissociate the clockdomain @clkdm from the powerdomain
367 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
368 * if @clkdm was not associated with the powerdomain, or 0 upon
371 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
376 if (!pwrdm || !clkdm)
379 pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
380 "%s\n", clkdm->name, pwrdm->name);
382 for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
383 if (pwrdm->pwrdm_clkdms[i] == clkdm)
386 if (i == PWRDM_MAX_CLKDMS) {
387 pr_debug("powerdomain: clkdm %s not associated with pwrdm "
388 "%s ?!\n", clkdm->name, pwrdm->name);
393 pwrdm->pwrdm_clkdms[i] = NULL;
402 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
403 * @pwrdm: struct powerdomain * to iterate over
404 * @fn: callback function *
406 * Call the supplied function @fn for each clockdomain in the powerdomain
407 * @pwrdm. The callback function can return anything but 0 to bail
408 * out early from the iterator. Returns -EINVAL if presented with
409 * invalid pointers; or passes along the last return value of the
410 * callback function, which should be 0 for success or anything else
411 * to indicate failure.
413 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
414 int (*fn)(struct powerdomain *pwrdm,
415 struct clockdomain *clkdm))
423 for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
424 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
430 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
431 * @pwrdm: struct powerdomain *
433 * Return the number of controllable memory banks in powerdomain @pwrdm,
434 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
436 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
445 * pwrdm_set_next_pwrst - set next powerdomain power state
446 * @pwrdm: struct powerdomain * to set
447 * @pwrst: one of the PWRDM_POWER_* macros
449 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
450 * may not enter this state immediately if the preconditions for this state
451 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
452 * null or if the power state is invalid for the powerdomin, or returns 0
455 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
462 if (!(pwrdm->pwrsts & (1 << pwrst)))
465 pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
468 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
469 /* Trace the pwrdm desired target state */
470 trace_power_domain_target(pwrdm->name, pwrst,
472 /* Program the pwrdm desired target state */
473 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
480 * pwrdm_read_next_pwrst - get next powerdomain power state
481 * @pwrdm: struct powerdomain * to get power state
483 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
484 * if the powerdomain pointer is null or returns the next power state
487 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
494 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
495 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
501 * pwrdm_read_pwrst - get current powerdomain power state
502 * @pwrdm: struct powerdomain * to get power state
504 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
505 * if the powerdomain pointer is null or returns the current power state
508 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
515 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
516 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
522 * pwrdm_read_prev_pwrst - get previous powerdomain power state
523 * @pwrdm: struct powerdomain * to get previous power state
525 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
526 * if the powerdomain pointer is null or returns the previous power state
529 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
536 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
537 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
543 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
544 * @pwrdm: struct powerdomain * to set
545 * @pwrst: one of the PWRDM_POWER_* macros
547 * Set the next power state @pwrst that the logic portion of the
548 * powerdomain @pwrdm will enter when the powerdomain enters retention.
549 * This will be either RETENTION or OFF, if supported. Returns
550 * -EINVAL if the powerdomain pointer is null or the target power
551 * state is not not supported, or returns 0 upon success.
553 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
560 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
563 pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
566 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
567 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
573 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
574 * @pwrdm: struct powerdomain * to set
575 * @bank: memory bank number to set (0-3)
576 * @pwrst: one of the PWRDM_POWER_* macros
578 * Set the next power state @pwrst that memory bank @bank of the
579 * powerdomain @pwrdm will enter when the powerdomain enters the ON
580 * state. @bank will be a number from 0 to 3, and represents different
581 * types of memory, depending on the powerdomain. Returns -EINVAL if
582 * the powerdomain pointer is null or the target power state is not
583 * not supported for this memory bank, -EEXIST if the target memory
584 * bank does not exist or is not controllable, or returns 0 upon
587 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
594 if (pwrdm->banks < (bank + 1))
597 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
600 pr_debug("powerdomain: setting next memory powerstate for domain %s "
601 "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);
603 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
604 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
610 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
611 * @pwrdm: struct powerdomain * to set
612 * @bank: memory bank number to set (0-3)
613 * @pwrst: one of the PWRDM_POWER_* macros
615 * Set the next power state @pwrst that memory bank @bank of the
616 * powerdomain @pwrdm will enter when the powerdomain enters the
617 * RETENTION state. Bank will be a number from 0 to 3, and represents
618 * different types of memory, depending on the powerdomain. @pwrst
619 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
620 * the powerdomain pointer is null or the target power state is not
621 * not supported for this memory bank, -EEXIST if the target memory
622 * bank does not exist or is not controllable, or returns 0 upon
625 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
632 if (pwrdm->banks < (bank + 1))
635 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
638 pr_debug("powerdomain: setting next memory powerstate for domain %s "
639 "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);
641 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
642 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
648 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
649 * @pwrdm: struct powerdomain * to get current logic retention power state
651 * Return the power state that the logic portion of powerdomain @pwrdm
652 * will enter when the powerdomain enters retention. Returns -EINVAL
653 * if the powerdomain pointer is null or returns the logic retention
654 * power state upon success.
656 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
663 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
664 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
670 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
671 * @pwrdm: struct powerdomain * to get previous logic power state
673 * Return the powerdomain @pwrdm's previous logic power state. Returns
674 * -EINVAL if the powerdomain pointer is null or returns the previous
675 * logic power state upon success.
677 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
684 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
685 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
691 * pwrdm_read_logic_retst - get next powerdomain logic power state
692 * @pwrdm: struct powerdomain * to get next logic power state
694 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
695 * if the powerdomain pointer is null or returns the next logic
696 * power state upon success.
698 int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
705 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
706 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
712 * pwrdm_read_mem_pwrst - get current memory bank power state
713 * @pwrdm: struct powerdomain * to get current memory bank power state
714 * @bank: memory bank number (0-3)
716 * Return the powerdomain @pwrdm's current memory power state for bank
717 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
718 * the target memory bank does not exist or is not controllable, or
719 * returns the current memory power state upon success.
721 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
728 if (pwrdm->banks < (bank + 1))
731 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
734 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
735 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
741 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
742 * @pwrdm: struct powerdomain * to get previous memory bank power state
743 * @bank: memory bank number (0-3)
745 * Return the powerdomain @pwrdm's previous memory power state for
746 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
747 * -EEXIST if the target memory bank does not exist or is not
748 * controllable, or returns the previous memory power state upon
751 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
758 if (pwrdm->banks < (bank + 1))
761 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
764 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
765 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
771 * pwrdm_read_mem_retst - get next memory bank power state
772 * @pwrdm: struct powerdomain * to get mext memory bank power state
773 * @bank: memory bank number (0-3)
775 * Return the powerdomain pwrdm's next memory power state for bank
776 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
777 * the target memory bank does not exist or is not controllable, or
778 * returns the next memory power state upon success.
780 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
787 if (pwrdm->banks < (bank + 1))
790 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
791 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
797 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
798 * @pwrdm: struct powerdomain * to clear
800 * Clear the powerdomain's previous power state register @pwrdm.
801 * Clears the entire register, including logic and memory bank
802 * previous power states. Returns -EINVAL if the powerdomain pointer
803 * is null, or returns 0 upon success.
805 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
813 * XXX should get the powerdomain's current state here;
814 * warn & fail if it is not ON.
817 pr_debug("powerdomain: clearing previous power state reg for %s\n",
820 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
821 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
827 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
828 * @pwrdm: struct powerdomain *
830 * Enable automatic context save-and-restore upon power state change
831 * for some devices in the powerdomain @pwrdm. Warning: this only
832 * affects a subset of devices in a powerdomain; check the TRM
833 * closely. Returns -EINVAL if the powerdomain pointer is null or if
834 * the powerdomain does not support automatic save-and-restore, or
835 * returns 0 upon success.
837 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
844 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
847 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
850 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
851 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
857 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
858 * @pwrdm: struct powerdomain *
860 * Disable automatic context save-and-restore upon power state change
861 * for some devices in the powerdomain @pwrdm. Warning: this only
862 * affects a subset of devices in a powerdomain; check the TRM
863 * closely. Returns -EINVAL if the powerdomain pointer is null or if
864 * the powerdomain does not support automatic save-and-restore, or
865 * returns 0 upon success.
867 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
874 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
877 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
880 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
881 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
887 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
888 * @pwrdm: struct powerdomain *
890 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
891 * for some devices, or 0 if it does not.
893 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
895 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
899 * pwrdm_set_lowpwrstchange - Request a low power state change
900 * @pwrdm: struct powerdomain *
902 * Allows a powerdomain to transtion to a lower power sleep state
903 * from an existing sleep state without waking up the powerdomain.
904 * Returns -EINVAL if the powerdomain pointer is null or if the
905 * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
908 int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
915 if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
918 pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
921 if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange)
922 ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
928 * pwrdm_wait_transition - wait for powerdomain power transition to finish
929 * @pwrdm: struct powerdomain * to wait for
931 * If the powerdomain @pwrdm is in the process of a state transition,
932 * spin until it completes the power transition, or until an iteration
933 * bailout value is reached. Returns -EINVAL if the powerdomain
934 * pointer is null, -EAGAIN if the bailout value was reached, or
935 * returns 0 upon success.
937 int pwrdm_wait_transition(struct powerdomain *pwrdm)
944 if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
945 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
950 int pwrdm_state_switch(struct powerdomain *pwrdm)
952 return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
955 int pwrdm_clkdm_state_switch(struct clockdomain *clkdm)
957 if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) {
958 pwrdm_wait_transition(clkdm->pwrdm.ptr);
959 return pwrdm_state_switch(clkdm->pwrdm.ptr);
965 int pwrdm_pre_transition(void)
967 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
971 int pwrdm_post_transition(void)
973 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
978 * pwrdm_get_context_loss_count - get powerdomain's context loss count
979 * @pwrdm: struct powerdomain * to wait for
981 * Context loss count is the sum of powerdomain off-mode counter, the
982 * logic off counter and the per-bank memory off counter. Returns 0
983 * (and WARNs) upon error, otherwise, returns the context loss count.
985 u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
990 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
994 count = pwrdm->state_counter[PWRDM_POWER_OFF];
995 count += pwrdm->ret_logic_off_counter;
997 for (i = 0; i < pwrdm->banks; i++)
998 count += pwrdm->ret_mem_off_counter[i];
1000 pr_debug("powerdomain: %s: context loss count = %u\n",
1001 pwrdm->name, count);
1007 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1008 * @pwrdm: struct powerdomain *
1010 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1011 * can lose either memory or logic context or if @pwrdm is invalid, or
1012 * returns 0 otherwise. This function is not concerned with how the
1013 * powerdomain registers are programmed (i.e., to go off or not); it's
1014 * concerned with whether it's ever possible for this powerdomain to
1015 * go off while some other part of the chip is active. This function
1016 * assumes that every powerdomain can go to either ON or INACTIVE.
1018 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
1022 if (IS_ERR_OR_NULL(pwrdm)) {
1023 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1028 if (pwrdm->pwrsts & PWRSTS_OFF)
1031 if (pwrdm->pwrsts & PWRSTS_RET) {
1032 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
1035 for (i = 0; i < pwrdm->banks; i++)
1036 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1040 for (i = 0; i < pwrdm->banks; i++)
1041 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)