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"
39 #define PWRDM_TRACE_STATES_FLAG (1<<31)
47 * Types of sleep_switch used internally in omap_set_pwrdm_state()
48 * and its associated static functions
50 * XXX Better documentation is needed here
52 #define ALREADYACTIVE_SWITCH 0
53 #define FORCEWAKEUP_SWITCH 1
54 #define LOWPOWERSTATE_SWITCH 2
55 #define ERROR_SWITCH 3
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 voltdm
= voltdm_lookup(pwrdm
->voltdm
.name
);
108 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
109 pwrdm
->name
, pwrdm
->voltdm
.name
);
112 pwrdm
->voltdm
.ptr
= voltdm
;
113 INIT_LIST_HEAD(&pwrdm
->voltdm_node
);
114 voltdm_add_pwrdm(voltdm
, pwrdm
);
115 spin_lock_init(&pwrdm
->_lock
);
117 list_add(&pwrdm
->node
, &pwrdm_list
);
119 /* Initialize the powerdomain's state counter */
120 for (i
= 0; i
< PWRDM_MAX_PWRSTS
; i
++)
121 pwrdm
->state_counter
[i
] = 0;
123 pwrdm
->ret_logic_off_counter
= 0;
124 for (i
= 0; i
< pwrdm
->banks
; i
++)
125 pwrdm
->ret_mem_off_counter
[i
] = 0;
127 arch_pwrdm
->pwrdm_wait_transition(pwrdm
);
128 pwrdm
->state
= pwrdm_read_pwrst(pwrdm
);
129 pwrdm
->state_counter
[pwrdm
->state
] = 1;
131 pr_debug("powerdomain: registered %s\n", pwrdm
->name
);
136 static void _update_logic_membank_counters(struct powerdomain
*pwrdm
)
139 u8 prev_logic_pwrst
, prev_mem_pwrst
;
141 prev_logic_pwrst
= pwrdm_read_prev_logic_pwrst(pwrdm
);
142 if ((pwrdm
->pwrsts_logic_ret
== PWRSTS_OFF_RET
) &&
143 (prev_logic_pwrst
== PWRDM_POWER_OFF
))
144 pwrdm
->ret_logic_off_counter
++;
146 for (i
= 0; i
< pwrdm
->banks
; i
++) {
147 prev_mem_pwrst
= pwrdm_read_prev_mem_pwrst(pwrdm
, i
);
149 if ((pwrdm
->pwrsts_mem_ret
[i
] == PWRSTS_OFF_RET
) &&
150 (prev_mem_pwrst
== PWRDM_POWER_OFF
))
151 pwrdm
->ret_mem_off_counter
[i
]++;
155 static int _pwrdm_state_switch(struct powerdomain
*pwrdm
, int flag
)
158 int prev
, next
, state
, trace_state
= 0;
163 state
= pwrdm_read_pwrst(pwrdm
);
166 case PWRDM_STATE_NOW
:
169 case PWRDM_STATE_PREV
:
170 prev
= pwrdm_read_prev_pwrst(pwrdm
);
171 if (pwrdm
->state
!= prev
)
172 pwrdm
->state_counter
[prev
]++;
173 if (prev
== PWRDM_POWER_RET
)
174 _update_logic_membank_counters(pwrdm
);
176 * If the power domain did not hit the desired state,
177 * generate a trace event with both the desired and hit states
179 next
= pwrdm_read_next_pwrst(pwrdm
);
181 trace_state
= (PWRDM_TRACE_STATES_FLAG
|
182 ((next
& OMAP_POWERSTATE_MASK
) << 8) |
183 ((prev
& OMAP_POWERSTATE_MASK
) << 0));
184 trace_power_domain_target(pwrdm
->name
, trace_state
,
193 pwrdm
->state_counter
[state
]++;
195 pm_dbg_update_time(pwrdm
, prev
);
197 pwrdm
->state
= state
;
202 static int _pwrdm_pre_transition_cb(struct powerdomain
*pwrdm
, void *unused
)
204 pwrdm_clear_all_prev_pwrst(pwrdm
);
205 _pwrdm_state_switch(pwrdm
, PWRDM_STATE_NOW
);
209 static int _pwrdm_post_transition_cb(struct powerdomain
*pwrdm
, void *unused
)
211 _pwrdm_state_switch(pwrdm
, PWRDM_STATE_PREV
);
216 * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
217 * @pwrdm: struct powerdomain * to operate on
218 * @curr_pwrst: current power state of @pwrdm
219 * @pwrst: power state to switch to
220 * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised
222 * Determine whether the powerdomain needs to be turned on before
223 * attempting to switch power states. Called by
224 * omap_set_pwrdm_state(). NOTE that if the powerdomain contains
225 * multiple clockdomains, this code assumes that the first clockdomain
226 * supports software-supervised wakeup mode - potentially a problem.
227 * Returns the power state switch mode currently in use (see the
228 * "Types of sleep_switch" comment above).
230 static u8
_pwrdm_save_clkdm_state_and_activate(struct powerdomain
*pwrdm
,
231 u8 curr_pwrst
, u8 pwrst
,
236 if (curr_pwrst
< 0) {
238 sleep_switch
= ERROR_SWITCH
;
239 } else if (curr_pwrst
< PWRDM_POWER_ON
) {
240 if (curr_pwrst
> pwrst
&&
241 pwrdm
->flags
& PWRDM_HAS_LOWPOWERSTATECHANGE
&&
242 arch_pwrdm
->pwrdm_set_lowpwrstchange
) {
243 sleep_switch
= LOWPOWERSTATE_SWITCH
;
245 *hwsup
= clkdm_in_hwsup(pwrdm
->pwrdm_clkdms
[0]);
246 clkdm_wakeup_nolock(pwrdm
->pwrdm_clkdms
[0]);
247 sleep_switch
= FORCEWAKEUP_SWITCH
;
250 sleep_switch
= ALREADYACTIVE_SWITCH
;
257 * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
258 * @pwrdm: struct powerdomain * to operate on
259 * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
260 * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode?
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.
270 static void _pwrdm_restore_clkdm_state(struct powerdomain
*pwrdm
,
271 u8 sleep_switch
, bool hwsup
)
273 switch (sleep_switch
) {
274 case FORCEWAKEUP_SWITCH
:
276 clkdm_allow_idle_nolock(pwrdm
->pwrdm_clkdms
[0]);
278 clkdm_sleep_nolock(pwrdm
->pwrdm_clkdms
[0]);
280 case LOWPOWERSTATE_SWITCH
:
281 if (pwrdm
->flags
& PWRDM_HAS_LOWPOWERSTATECHANGE
&&
282 arch_pwrdm
->pwrdm_set_lowpwrstchange
)
283 arch_pwrdm
->pwrdm_set_lowpwrstchange(pwrdm
);
284 pwrdm_state_switch_nolock(pwrdm
);
289 /* Public functions */
292 * pwrdm_register_platform_funcs - register powerdomain implementation fns
293 * @po: func pointers for arch specific implementations
295 * Register the list of function pointers used to implement the
296 * powerdomain functions on different OMAP SoCs. Should be called
297 * before any other pwrdm_register*() function. Returns -EINVAL if
298 * @po is null, -EEXIST if platform functions have already been
299 * registered, or 0 upon success.
301 int pwrdm_register_platform_funcs(struct pwrdm_ops
*po
)
315 * pwrdm_register_pwrdms - register SoC powerdomains
316 * @ps: pointer to an array of struct powerdomain to register
318 * Register the powerdomains available on a particular OMAP SoC. Must
319 * be called after pwrdm_register_platform_funcs(). May be called
320 * multiple times. Returns -EACCES if called before
321 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
322 * null; or 0 upon success.
324 int pwrdm_register_pwrdms(struct powerdomain
**ps
)
326 struct powerdomain
**p
= NULL
;
334 for (p
= ps
; *p
; p
++)
341 * pwrdm_complete_init - set up the powerdomain layer
343 * Do whatever is necessary to initialize registered powerdomains and
344 * powerdomain code. Currently, this programs the next power state
345 * for each powerdomain to ON. This prevents powerdomains from
346 * unexpectedly losing context or entering high wakeup latency modes
347 * with non-power-management-enabled kernels. Must be called after
348 * pwrdm_register_pwrdms(). Returns -EACCES if called before
349 * pwrdm_register_pwrdms(), or 0 upon success.
351 int pwrdm_complete_init(void)
353 struct powerdomain
*temp_p
;
355 if (list_empty(&pwrdm_list
))
358 list_for_each_entry(temp_p
, &pwrdm_list
, node
)
359 pwrdm_set_next_pwrst(temp_p
, PWRDM_POWER_ON
);
365 * pwrdm_lock - acquire a Linux spinlock on a powerdomain
366 * @pwrdm: struct powerdomain * to lock
368 * Acquire the powerdomain spinlock on @pwrdm. No return value.
370 void pwrdm_lock(struct powerdomain
*pwrdm
)
371 __acquires(&pwrdm
->_lock
)
373 spin_lock_irqsave(&pwrdm
->_lock
, pwrdm
->_lock_flags
);
377 * pwrdm_unlock - release a Linux spinlock on a powerdomain
378 * @pwrdm: struct powerdomain * to unlock
380 * Release the powerdomain spinlock on @pwrdm. No return value.
382 void pwrdm_unlock(struct powerdomain
*pwrdm
)
383 __releases(&pwrdm
->_lock
)
385 spin_unlock_irqrestore(&pwrdm
->_lock
, pwrdm
->_lock_flags
);
389 * pwrdm_lookup - look up a powerdomain by name, return a pointer
390 * @name: name of powerdomain
392 * Find a registered powerdomain by its name @name. Returns a pointer
393 * to the struct powerdomain if found, or NULL otherwise.
395 struct powerdomain
*pwrdm_lookup(const char *name
)
397 struct powerdomain
*pwrdm
;
402 pwrdm
= _pwrdm_lookup(name
);
408 * pwrdm_for_each - call function on each registered clockdomain
409 * @fn: callback function *
411 * Call the supplied function @fn for each registered powerdomain.
412 * The callback function @fn can return anything but 0 to bail out
413 * early from the iterator. Returns the last return value of the
414 * callback function, which should be 0 for success or anything else
415 * to indicate failure; or -EINVAL if the function pointer is null.
417 int pwrdm_for_each(int (*fn
)(struct powerdomain
*pwrdm
, void *user
),
420 struct powerdomain
*temp_pwrdm
;
426 list_for_each_entry(temp_pwrdm
, &pwrdm_list
, node
) {
427 ret
= (*fn
)(temp_pwrdm
, user
);
436 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
437 * @pwrdm: struct powerdomain * to add the clockdomain to
438 * @clkdm: struct clockdomain * to associate with a powerdomain
440 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
441 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
442 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
445 int pwrdm_add_clkdm(struct powerdomain
*pwrdm
, struct clockdomain
*clkdm
)
450 if (!pwrdm
|| !clkdm
)
453 pr_debug("powerdomain: %s: associating clockdomain %s\n",
454 pwrdm
->name
, clkdm
->name
);
456 for (i
= 0; i
< PWRDM_MAX_CLKDMS
; i
++) {
457 if (!pwrdm
->pwrdm_clkdms
[i
])
460 if (pwrdm
->pwrdm_clkdms
[i
] == clkdm
) {
467 if (i
== PWRDM_MAX_CLKDMS
) {
468 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
469 pwrdm
->name
, clkdm
->name
);
475 pwrdm
->pwrdm_clkdms
[i
] = clkdm
;
484 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
485 * @pwrdm: struct powerdomain * to add the clockdomain to
486 * @clkdm: struct clockdomain * to associate with a powerdomain
488 * Dissociate the clockdomain @clkdm from the powerdomain
489 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
490 * if @clkdm was not associated with the powerdomain, or 0 upon
493 int pwrdm_del_clkdm(struct powerdomain
*pwrdm
, struct clockdomain
*clkdm
)
498 if (!pwrdm
|| !clkdm
)
501 pr_debug("powerdomain: %s: dissociating clockdomain %s\n",
502 pwrdm
->name
, clkdm
->name
);
504 for (i
= 0; i
< PWRDM_MAX_CLKDMS
; i
++)
505 if (pwrdm
->pwrdm_clkdms
[i
] == clkdm
)
508 if (i
== PWRDM_MAX_CLKDMS
) {
509 pr_debug("powerdomain: %s: clkdm %s not associated?!\n",
510 pwrdm
->name
, clkdm
->name
);
515 pwrdm
->pwrdm_clkdms
[i
] = NULL
;
524 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
525 * @pwrdm: struct powerdomain * to iterate over
526 * @fn: callback function *
528 * Call the supplied function @fn for each clockdomain in the powerdomain
529 * @pwrdm. The callback function can return anything but 0 to bail
530 * out early from the iterator. Returns -EINVAL if presented with
531 * invalid pointers; or passes along the last return value of the
532 * callback function, which should be 0 for success or anything else
533 * to indicate failure.
535 int pwrdm_for_each_clkdm(struct powerdomain
*pwrdm
,
536 int (*fn
)(struct powerdomain
*pwrdm
,
537 struct clockdomain
*clkdm
))
545 for (i
= 0; i
< PWRDM_MAX_CLKDMS
&& !ret
; i
++)
546 ret
= (*fn
)(pwrdm
, pwrdm
->pwrdm_clkdms
[i
]);
552 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in
553 * @pwrdm: struct powerdomain *
555 * Return a pointer to the struct voltageomain that the specified powerdomain
558 struct voltagedomain
*pwrdm_get_voltdm(struct powerdomain
*pwrdm
)
560 return pwrdm
->voltdm
.ptr
;
564 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
565 * @pwrdm: struct powerdomain *
567 * Return the number of controllable memory banks in powerdomain @pwrdm,
568 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
570 int pwrdm_get_mem_bank_count(struct powerdomain
*pwrdm
)
579 * pwrdm_set_next_pwrst - set next powerdomain power state
580 * @pwrdm: struct powerdomain * to set
581 * @pwrst: one of the PWRDM_POWER_* macros
583 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
584 * may not enter this state immediately if the preconditions for this state
585 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
586 * null or if the power state is invalid for the powerdomin, or returns 0
589 int pwrdm_set_next_pwrst(struct powerdomain
*pwrdm
, u8 pwrst
)
596 if (!(pwrdm
->pwrsts
& (1 << pwrst
)))
599 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
602 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_next_pwrst
) {
603 /* Trace the pwrdm desired target state */
604 trace_power_domain_target(pwrdm
->name
, pwrst
,
606 /* Program the pwrdm desired target state */
607 ret
= arch_pwrdm
->pwrdm_set_next_pwrst(pwrdm
, pwrst
);
614 * pwrdm_read_next_pwrst - get next powerdomain power state
615 * @pwrdm: struct powerdomain * to get power state
617 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
618 * if the powerdomain pointer is null or returns the next power state
621 int pwrdm_read_next_pwrst(struct powerdomain
*pwrdm
)
628 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_next_pwrst
)
629 ret
= arch_pwrdm
->pwrdm_read_next_pwrst(pwrdm
);
635 * pwrdm_read_pwrst - get current powerdomain power state
636 * @pwrdm: struct powerdomain * to get power state
638 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
639 * if the powerdomain pointer is null or returns the current power state
640 * upon success. Note that if the power domain only supports the ON state
641 * then just return ON as the current state.
643 int pwrdm_read_pwrst(struct powerdomain
*pwrdm
)
650 if (pwrdm
->pwrsts
== PWRSTS_ON
)
651 return PWRDM_POWER_ON
;
653 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_pwrst
)
654 ret
= arch_pwrdm
->pwrdm_read_pwrst(pwrdm
);
660 * pwrdm_read_prev_pwrst - get previous powerdomain power state
661 * @pwrdm: struct powerdomain * to get previous power state
663 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
664 * if the powerdomain pointer is null or returns the previous power state
667 int pwrdm_read_prev_pwrst(struct powerdomain
*pwrdm
)
674 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_pwrst
)
675 ret
= arch_pwrdm
->pwrdm_read_prev_pwrst(pwrdm
);
681 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
682 * @pwrdm: struct powerdomain * to set
683 * @pwrst: one of the PWRDM_POWER_* macros
685 * Set the next power state @pwrst that the logic portion of the
686 * powerdomain @pwrdm will enter when the powerdomain enters retention.
687 * This will be either RETENTION or OFF, if supported. Returns
688 * -EINVAL if the powerdomain pointer is null or the target power
689 * state is not not supported, or returns 0 upon success.
691 int pwrdm_set_logic_retst(struct powerdomain
*pwrdm
, u8 pwrst
)
698 if (!(pwrdm
->pwrsts_logic_ret
& (1 << pwrst
)))
701 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
704 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_logic_retst
)
705 ret
= arch_pwrdm
->pwrdm_set_logic_retst(pwrdm
, pwrst
);
711 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
712 * @pwrdm: struct powerdomain * to set
713 * @bank: memory bank number to set (0-3)
714 * @pwrst: one of the PWRDM_POWER_* macros
716 * Set the next power state @pwrst that memory bank @bank of the
717 * powerdomain @pwrdm will enter when the powerdomain enters the ON
718 * state. @bank will be a number from 0 to 3, and represents different
719 * types of memory, depending on the powerdomain. Returns -EINVAL if
720 * the powerdomain pointer is null or the target power state is not
721 * not supported for this memory bank, -EEXIST if the target memory
722 * bank does not exist or is not controllable, or returns 0 upon
725 int pwrdm_set_mem_onst(struct powerdomain
*pwrdm
, u8 bank
, u8 pwrst
)
732 if (pwrdm
->banks
< (bank
+ 1))
735 if (!(pwrdm
->pwrsts_mem_on
[bank
] & (1 << pwrst
)))
738 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
739 pwrdm
->name
, bank
, pwrst
);
741 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_mem_onst
)
742 ret
= arch_pwrdm
->pwrdm_set_mem_onst(pwrdm
, bank
, pwrst
);
748 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
749 * @pwrdm: struct powerdomain * to set
750 * @bank: memory bank number to set (0-3)
751 * @pwrst: one of the PWRDM_POWER_* macros
753 * Set the next power state @pwrst that memory bank @bank of the
754 * powerdomain @pwrdm will enter when the powerdomain enters the
755 * RETENTION state. Bank will be a number from 0 to 3, and represents
756 * different types of memory, depending on the powerdomain. @pwrst
757 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
758 * the powerdomain pointer is null or the target power state is not
759 * not supported for this memory bank, -EEXIST if the target memory
760 * bank does not exist or is not controllable, or returns 0 upon
763 int pwrdm_set_mem_retst(struct powerdomain
*pwrdm
, u8 bank
, u8 pwrst
)
770 if (pwrdm
->banks
< (bank
+ 1))
773 if (!(pwrdm
->pwrsts_mem_ret
[bank
] & (1 << pwrst
)))
776 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
777 pwrdm
->name
, bank
, pwrst
);
779 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_mem_retst
)
780 ret
= arch_pwrdm
->pwrdm_set_mem_retst(pwrdm
, bank
, pwrst
);
786 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
787 * @pwrdm: struct powerdomain * to get current logic retention power state
789 * Return the power state that the logic portion of powerdomain @pwrdm
790 * will enter when the powerdomain enters retention. Returns -EINVAL
791 * if the powerdomain pointer is null or returns the logic retention
792 * power state upon success.
794 int pwrdm_read_logic_pwrst(struct powerdomain
*pwrdm
)
801 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_logic_pwrst
)
802 ret
= arch_pwrdm
->pwrdm_read_logic_pwrst(pwrdm
);
808 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
809 * @pwrdm: struct powerdomain * to get previous logic power state
811 * Return the powerdomain @pwrdm's previous logic power state. Returns
812 * -EINVAL if the powerdomain pointer is null or returns the previous
813 * logic power state upon success.
815 int pwrdm_read_prev_logic_pwrst(struct powerdomain
*pwrdm
)
822 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_logic_pwrst
)
823 ret
= arch_pwrdm
->pwrdm_read_prev_logic_pwrst(pwrdm
);
829 * pwrdm_read_logic_retst - get next powerdomain logic power state
830 * @pwrdm: struct powerdomain * to get next logic power state
832 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
833 * if the powerdomain pointer is null or returns the next logic
834 * power state upon success.
836 int pwrdm_read_logic_retst(struct powerdomain
*pwrdm
)
843 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_logic_retst
)
844 ret
= arch_pwrdm
->pwrdm_read_logic_retst(pwrdm
);
850 * pwrdm_read_mem_pwrst - get current memory bank power state
851 * @pwrdm: struct powerdomain * to get current memory bank power state
852 * @bank: memory bank number (0-3)
854 * Return the powerdomain @pwrdm's current memory power state for bank
855 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
856 * the target memory bank does not exist or is not controllable, or
857 * returns the current memory power state upon success.
859 int pwrdm_read_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
866 if (pwrdm
->banks
< (bank
+ 1))
869 if (pwrdm
->flags
& PWRDM_HAS_MPU_QUIRK
)
872 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_mem_pwrst
)
873 ret
= arch_pwrdm
->pwrdm_read_mem_pwrst(pwrdm
, bank
);
879 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
880 * @pwrdm: struct powerdomain * to get previous memory bank power state
881 * @bank: memory bank number (0-3)
883 * Return the powerdomain @pwrdm's previous memory power state for
884 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
885 * -EEXIST if the target memory bank does not exist or is not
886 * controllable, or returns the previous memory power state upon
889 int pwrdm_read_prev_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
896 if (pwrdm
->banks
< (bank
+ 1))
899 if (pwrdm
->flags
& PWRDM_HAS_MPU_QUIRK
)
902 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_mem_pwrst
)
903 ret
= arch_pwrdm
->pwrdm_read_prev_mem_pwrst(pwrdm
, bank
);
909 * pwrdm_read_mem_retst - get next memory bank power state
910 * @pwrdm: struct powerdomain * to get mext memory bank power state
911 * @bank: memory bank number (0-3)
913 * Return the powerdomain pwrdm's next memory power state for bank
914 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
915 * the target memory bank does not exist or is not controllable, or
916 * returns the next memory power state upon success.
918 int pwrdm_read_mem_retst(struct powerdomain
*pwrdm
, u8 bank
)
925 if (pwrdm
->banks
< (bank
+ 1))
928 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_mem_retst
)
929 ret
= arch_pwrdm
->pwrdm_read_mem_retst(pwrdm
, bank
);
935 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
936 * @pwrdm: struct powerdomain * to clear
938 * Clear the powerdomain's previous power state register @pwrdm.
939 * Clears the entire register, including logic and memory bank
940 * previous power states. Returns -EINVAL if the powerdomain pointer
941 * is null, or returns 0 upon success.
943 int pwrdm_clear_all_prev_pwrst(struct powerdomain
*pwrdm
)
951 * XXX should get the powerdomain's current state here;
952 * warn & fail if it is not ON.
955 pr_debug("powerdomain: %s: clearing previous power state reg\n",
958 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_clear_all_prev_pwrst
)
959 ret
= arch_pwrdm
->pwrdm_clear_all_prev_pwrst(pwrdm
);
965 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
966 * @pwrdm: struct powerdomain *
968 * Enable automatic context save-and-restore upon power state change
969 * for some devices in the powerdomain @pwrdm. Warning: this only
970 * affects a subset of devices in a powerdomain; check the TRM
971 * closely. Returns -EINVAL if the powerdomain pointer is null or if
972 * the powerdomain does not support automatic save-and-restore, or
973 * returns 0 upon success.
975 int pwrdm_enable_hdwr_sar(struct powerdomain
*pwrdm
)
982 if (!(pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
))
985 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm
->name
);
987 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_enable_hdwr_sar
)
988 ret
= arch_pwrdm
->pwrdm_enable_hdwr_sar(pwrdm
);
994 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
995 * @pwrdm: struct powerdomain *
997 * Disable automatic context save-and-restore upon power state change
998 * for some devices in the powerdomain @pwrdm. Warning: this only
999 * affects a subset of devices in a powerdomain; check the TRM
1000 * closely. Returns -EINVAL if the powerdomain pointer is null or if
1001 * the powerdomain does not support automatic save-and-restore, or
1002 * returns 0 upon success.
1004 int pwrdm_disable_hdwr_sar(struct powerdomain
*pwrdm
)
1011 if (!(pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
))
1014 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm
->name
);
1016 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_disable_hdwr_sar
)
1017 ret
= arch_pwrdm
->pwrdm_disable_hdwr_sar(pwrdm
);
1023 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1024 * @pwrdm: struct powerdomain *
1026 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
1027 * for some devices, or 0 if it does not.
1029 bool pwrdm_has_hdwr_sar(struct powerdomain
*pwrdm
)
1031 return (pwrdm
&& pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
) ? 1 : 0;
1034 int pwrdm_state_switch_nolock(struct powerdomain
*pwrdm
)
1038 if (!pwrdm
|| !arch_pwrdm
)
1041 ret
= arch_pwrdm
->pwrdm_wait_transition(pwrdm
);
1043 ret
= _pwrdm_state_switch(pwrdm
, PWRDM_STATE_NOW
);
1048 int __deprecated
pwrdm_state_switch(struct powerdomain
*pwrdm
)
1053 ret
= pwrdm_state_switch_nolock(pwrdm
);
1054 pwrdm_unlock(pwrdm
);
1059 int pwrdm_pre_transition(struct powerdomain
*pwrdm
)
1062 _pwrdm_pre_transition_cb(pwrdm
, NULL
);
1064 pwrdm_for_each(_pwrdm_pre_transition_cb
, NULL
);
1069 int pwrdm_post_transition(struct powerdomain
*pwrdm
)
1072 _pwrdm_post_transition_cb(pwrdm
, NULL
);
1074 pwrdm_for_each(_pwrdm_post_transition_cb
, NULL
);
1080 * omap_set_pwrdm_state - change a powerdomain's current power state
1081 * @pwrdm: struct powerdomain * to change the power state of
1082 * @pwrst: power state to change to
1084 * Change the current hardware power state of the powerdomain
1085 * represented by @pwrdm to the power state represented by @pwrst.
1086 * Returns -EINVAL if @pwrdm is null or invalid or if the
1087 * powerdomain's current power state could not be read, or returns 0
1088 * upon success or if @pwrdm does not support @pwrst or any
1089 * lower-power state. XXX Should not return 0 if the @pwrdm does not
1090 * support @pwrst or any lower-power state: this should be an error.
1092 int omap_set_pwrdm_state(struct powerdomain
*pwrdm
, u8 pwrst
)
1094 u8 curr_pwrst
, next_pwrst
, sleep_switch
;
1098 if (!pwrdm
|| IS_ERR(pwrdm
))
1101 while (!(pwrdm
->pwrsts
& (1 << pwrst
))) {
1102 if (pwrst
== PWRDM_POWER_OFF
)
1109 curr_pwrst
= pwrdm_read_pwrst(pwrdm
);
1110 next_pwrst
= pwrdm_read_next_pwrst(pwrdm
);
1111 if (curr_pwrst
== pwrst
&& next_pwrst
== pwrst
)
1114 sleep_switch
= _pwrdm_save_clkdm_state_and_activate(pwrdm
, curr_pwrst
,
1116 if (sleep_switch
== ERROR_SWITCH
) {
1121 ret
= pwrdm_set_next_pwrst(pwrdm
, pwrst
);
1123 pr_err("%s: unable to set power state of powerdomain: %s\n",
1124 __func__
, pwrdm
->name
);
1126 _pwrdm_restore_clkdm_state(pwrdm
, sleep_switch
, hwsup
);
1129 pwrdm_unlock(pwrdm
);
1135 * pwrdm_get_context_loss_count - get powerdomain's context loss count
1136 * @pwrdm: struct powerdomain * to wait for
1138 * Context loss count is the sum of powerdomain off-mode counter, the
1139 * logic off counter and the per-bank memory off counter. Returns negative
1140 * (and WARNs) upon error, otherwise, returns the context loss count.
1142 int pwrdm_get_context_loss_count(struct powerdomain
*pwrdm
)
1147 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__
);
1151 count
= pwrdm
->state_counter
[PWRDM_POWER_OFF
];
1152 count
+= pwrdm
->ret_logic_off_counter
;
1154 for (i
= 0; i
< pwrdm
->banks
; i
++)
1155 count
+= pwrdm
->ret_mem_off_counter
[i
];
1158 * Context loss count has to be a non-negative value. Clear the sign
1159 * bit to get a value range from 0 to INT_MAX.
1163 pr_debug("powerdomain: %s: context loss count = %d\n",
1164 pwrdm
->name
, count
);
1170 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1171 * @pwrdm: struct powerdomain *
1173 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1174 * can lose either memory or logic context or if @pwrdm is invalid, or
1175 * returns 0 otherwise. This function is not concerned with how the
1176 * powerdomain registers are programmed (i.e., to go off or not); it's
1177 * concerned with whether it's ever possible for this powerdomain to
1178 * go off while some other part of the chip is active. This function
1179 * assumes that every powerdomain can go to either ON or INACTIVE.
1181 bool pwrdm_can_ever_lose_context(struct powerdomain
*pwrdm
)
1185 if (IS_ERR_OR_NULL(pwrdm
)) {
1186 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1191 if (pwrdm
->pwrsts
& PWRSTS_OFF
)
1194 if (pwrdm
->pwrsts
& PWRSTS_RET
) {
1195 if (pwrdm
->pwrsts_logic_ret
& PWRSTS_OFF
)
1198 for (i
= 0; i
< pwrdm
->banks
; i
++)
1199 if (pwrdm
->pwrsts_mem_ret
[i
] & PWRSTS_OFF
)
1203 for (i
= 0; i
< pwrdm
->banks
; i
++)
1204 if (pwrdm
->pwrsts_mem_on
[i
] & PWRSTS_OFF
)