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 if (pwrdm
->pwrdm_clkdms
[i
])
550 ret
= (*fn
)(pwrdm
, pwrdm
->pwrdm_clkdms
[i
]);
556 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in
557 * @pwrdm: struct powerdomain *
559 * Return a pointer to the struct voltageomain that the specified powerdomain
562 struct voltagedomain
*pwrdm_get_voltdm(struct powerdomain
*pwrdm
)
564 return pwrdm
->voltdm
.ptr
;
568 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
569 * @pwrdm: struct powerdomain *
571 * Return the number of controllable memory banks in powerdomain @pwrdm,
572 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
574 int pwrdm_get_mem_bank_count(struct powerdomain
*pwrdm
)
583 * pwrdm_set_next_pwrst - set next powerdomain power state
584 * @pwrdm: struct powerdomain * to set
585 * @pwrst: one of the PWRDM_POWER_* macros
587 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
588 * may not enter this state immediately if the preconditions for this state
589 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
590 * null or if the power state is invalid for the powerdomin, or returns 0
593 int pwrdm_set_next_pwrst(struct powerdomain
*pwrdm
, u8 pwrst
)
600 if (!(pwrdm
->pwrsts
& (1 << pwrst
)))
603 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
606 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_next_pwrst
) {
607 /* Trace the pwrdm desired target state */
608 trace_power_domain_target(pwrdm
->name
, pwrst
,
610 /* Program the pwrdm desired target state */
611 ret
= arch_pwrdm
->pwrdm_set_next_pwrst(pwrdm
, pwrst
);
618 * pwrdm_read_next_pwrst - get next powerdomain power state
619 * @pwrdm: struct powerdomain * to get power state
621 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
622 * if the powerdomain pointer is null or returns the next power state
625 int pwrdm_read_next_pwrst(struct powerdomain
*pwrdm
)
632 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_next_pwrst
)
633 ret
= arch_pwrdm
->pwrdm_read_next_pwrst(pwrdm
);
639 * pwrdm_read_pwrst - get current powerdomain power state
640 * @pwrdm: struct powerdomain * to get power state
642 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
643 * if the powerdomain pointer is null or returns the current power state
644 * upon success. Note that if the power domain only supports the ON state
645 * then just return ON as the current state.
647 int pwrdm_read_pwrst(struct powerdomain
*pwrdm
)
654 if (pwrdm
->pwrsts
== PWRSTS_ON
)
655 return PWRDM_POWER_ON
;
657 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_pwrst
)
658 ret
= arch_pwrdm
->pwrdm_read_pwrst(pwrdm
);
664 * pwrdm_read_prev_pwrst - get previous powerdomain power state
665 * @pwrdm: struct powerdomain * to get previous power state
667 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
668 * if the powerdomain pointer is null or returns the previous power state
671 int pwrdm_read_prev_pwrst(struct powerdomain
*pwrdm
)
678 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_pwrst
)
679 ret
= arch_pwrdm
->pwrdm_read_prev_pwrst(pwrdm
);
685 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
686 * @pwrdm: struct powerdomain * to set
687 * @pwrst: one of the PWRDM_POWER_* macros
689 * Set the next power state @pwrst that the logic portion of the
690 * powerdomain @pwrdm will enter when the powerdomain enters retention.
691 * This will be either RETENTION or OFF, if supported. Returns
692 * -EINVAL if the powerdomain pointer is null or the target power
693 * state is not not supported, or returns 0 upon success.
695 int pwrdm_set_logic_retst(struct powerdomain
*pwrdm
, u8 pwrst
)
702 if (!(pwrdm
->pwrsts_logic_ret
& (1 << pwrst
)))
705 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
708 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_logic_retst
)
709 ret
= arch_pwrdm
->pwrdm_set_logic_retst(pwrdm
, pwrst
);
715 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
716 * @pwrdm: struct powerdomain * to set
717 * @bank: memory bank number to set (0-3)
718 * @pwrst: one of the PWRDM_POWER_* macros
720 * Set the next power state @pwrst that memory bank @bank of the
721 * powerdomain @pwrdm will enter when the powerdomain enters the ON
722 * state. @bank will be a number from 0 to 3, and represents different
723 * types of memory, depending on the powerdomain. Returns -EINVAL if
724 * the powerdomain pointer is null or the target power state is not
725 * not supported for this memory bank, -EEXIST if the target memory
726 * bank does not exist or is not controllable, or returns 0 upon
729 int pwrdm_set_mem_onst(struct powerdomain
*pwrdm
, u8 bank
, u8 pwrst
)
736 if (pwrdm
->banks
< (bank
+ 1))
739 if (!(pwrdm
->pwrsts_mem_on
[bank
] & (1 << pwrst
)))
742 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
743 pwrdm
->name
, bank
, pwrst
);
745 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_mem_onst
)
746 ret
= arch_pwrdm
->pwrdm_set_mem_onst(pwrdm
, bank
, pwrst
);
752 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
753 * @pwrdm: struct powerdomain * to set
754 * @bank: memory bank number to set (0-3)
755 * @pwrst: one of the PWRDM_POWER_* macros
757 * Set the next power state @pwrst that memory bank @bank of the
758 * powerdomain @pwrdm will enter when the powerdomain enters the
759 * RETENTION state. Bank will be a number from 0 to 3, and represents
760 * different types of memory, depending on the powerdomain. @pwrst
761 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
762 * the powerdomain pointer is null or the target power state is not
763 * not supported for this memory bank, -EEXIST if the target memory
764 * bank does not exist or is not controllable, or returns 0 upon
767 int pwrdm_set_mem_retst(struct powerdomain
*pwrdm
, u8 bank
, u8 pwrst
)
774 if (pwrdm
->banks
< (bank
+ 1))
777 if (!(pwrdm
->pwrsts_mem_ret
[bank
] & (1 << pwrst
)))
780 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
781 pwrdm
->name
, bank
, pwrst
);
783 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_set_mem_retst
)
784 ret
= arch_pwrdm
->pwrdm_set_mem_retst(pwrdm
, bank
, pwrst
);
790 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
791 * @pwrdm: struct powerdomain * to get current logic retention power state
793 * Return the power state that the logic portion of powerdomain @pwrdm
794 * will enter when the powerdomain enters retention. Returns -EINVAL
795 * if the powerdomain pointer is null or returns the logic retention
796 * power state upon success.
798 int pwrdm_read_logic_pwrst(struct powerdomain
*pwrdm
)
805 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_logic_pwrst
)
806 ret
= arch_pwrdm
->pwrdm_read_logic_pwrst(pwrdm
);
812 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
813 * @pwrdm: struct powerdomain * to get previous logic power state
815 * Return the powerdomain @pwrdm's previous logic power state. Returns
816 * -EINVAL if the powerdomain pointer is null or returns the previous
817 * logic power state upon success.
819 int pwrdm_read_prev_logic_pwrst(struct powerdomain
*pwrdm
)
826 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_logic_pwrst
)
827 ret
= arch_pwrdm
->pwrdm_read_prev_logic_pwrst(pwrdm
);
833 * pwrdm_read_logic_retst - get next powerdomain logic power state
834 * @pwrdm: struct powerdomain * to get next logic power state
836 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
837 * if the powerdomain pointer is null or returns the next logic
838 * power state upon success.
840 int pwrdm_read_logic_retst(struct powerdomain
*pwrdm
)
847 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_logic_retst
)
848 ret
= arch_pwrdm
->pwrdm_read_logic_retst(pwrdm
);
854 * pwrdm_read_mem_pwrst - get current memory bank power state
855 * @pwrdm: struct powerdomain * to get current memory bank power state
856 * @bank: memory bank number (0-3)
858 * Return the powerdomain @pwrdm's current memory power state for bank
859 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
860 * the target memory bank does not exist or is not controllable, or
861 * returns the current memory power state upon success.
863 int pwrdm_read_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
870 if (pwrdm
->banks
< (bank
+ 1))
873 if (pwrdm
->flags
& PWRDM_HAS_MPU_QUIRK
)
876 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_mem_pwrst
)
877 ret
= arch_pwrdm
->pwrdm_read_mem_pwrst(pwrdm
, bank
);
883 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
884 * @pwrdm: struct powerdomain * to get previous memory bank power state
885 * @bank: memory bank number (0-3)
887 * Return the powerdomain @pwrdm's previous memory power state for
888 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
889 * -EEXIST if the target memory bank does not exist or is not
890 * controllable, or returns the previous memory power state upon
893 int pwrdm_read_prev_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
900 if (pwrdm
->banks
< (bank
+ 1))
903 if (pwrdm
->flags
& PWRDM_HAS_MPU_QUIRK
)
906 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_prev_mem_pwrst
)
907 ret
= arch_pwrdm
->pwrdm_read_prev_mem_pwrst(pwrdm
, bank
);
913 * pwrdm_read_mem_retst - get next memory bank power state
914 * @pwrdm: struct powerdomain * to get mext memory bank power state
915 * @bank: memory bank number (0-3)
917 * Return the powerdomain pwrdm's next memory power state for bank
918 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
919 * the target memory bank does not exist or is not controllable, or
920 * returns the next memory power state upon success.
922 int pwrdm_read_mem_retst(struct powerdomain
*pwrdm
, u8 bank
)
929 if (pwrdm
->banks
< (bank
+ 1))
932 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_read_mem_retst
)
933 ret
= arch_pwrdm
->pwrdm_read_mem_retst(pwrdm
, bank
);
939 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
940 * @pwrdm: struct powerdomain * to clear
942 * Clear the powerdomain's previous power state register @pwrdm.
943 * Clears the entire register, including logic and memory bank
944 * previous power states. Returns -EINVAL if the powerdomain pointer
945 * is null, or returns 0 upon success.
947 int pwrdm_clear_all_prev_pwrst(struct powerdomain
*pwrdm
)
955 * XXX should get the powerdomain's current state here;
956 * warn & fail if it is not ON.
959 pr_debug("powerdomain: %s: clearing previous power state reg\n",
962 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_clear_all_prev_pwrst
)
963 ret
= arch_pwrdm
->pwrdm_clear_all_prev_pwrst(pwrdm
);
969 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
970 * @pwrdm: struct powerdomain *
972 * Enable automatic context save-and-restore upon power state change
973 * for some devices in the powerdomain @pwrdm. Warning: this only
974 * affects a subset of devices in a powerdomain; check the TRM
975 * closely. Returns -EINVAL if the powerdomain pointer is null or if
976 * the powerdomain does not support automatic save-and-restore, or
977 * returns 0 upon success.
979 int pwrdm_enable_hdwr_sar(struct powerdomain
*pwrdm
)
986 if (!(pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
))
989 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm
->name
);
991 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_enable_hdwr_sar
)
992 ret
= arch_pwrdm
->pwrdm_enable_hdwr_sar(pwrdm
);
998 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
999 * @pwrdm: struct powerdomain *
1001 * Disable automatic context save-and-restore upon power state change
1002 * for some devices in the powerdomain @pwrdm. Warning: this only
1003 * affects a subset of devices in a powerdomain; check the TRM
1004 * closely. Returns -EINVAL if the powerdomain pointer is null or if
1005 * the powerdomain does not support automatic save-and-restore, or
1006 * returns 0 upon success.
1008 int pwrdm_disable_hdwr_sar(struct powerdomain
*pwrdm
)
1015 if (!(pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
))
1018 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm
->name
);
1020 if (arch_pwrdm
&& arch_pwrdm
->pwrdm_disable_hdwr_sar
)
1021 ret
= arch_pwrdm
->pwrdm_disable_hdwr_sar(pwrdm
);
1027 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1028 * @pwrdm: struct powerdomain *
1030 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
1031 * for some devices, or 0 if it does not.
1033 bool pwrdm_has_hdwr_sar(struct powerdomain
*pwrdm
)
1035 return (pwrdm
&& pwrdm
->flags
& PWRDM_HAS_HDWR_SAR
) ? 1 : 0;
1038 int pwrdm_state_switch_nolock(struct powerdomain
*pwrdm
)
1042 if (!pwrdm
|| !arch_pwrdm
)
1045 ret
= arch_pwrdm
->pwrdm_wait_transition(pwrdm
);
1047 ret
= _pwrdm_state_switch(pwrdm
, PWRDM_STATE_NOW
);
1052 int __deprecated
pwrdm_state_switch(struct powerdomain
*pwrdm
)
1057 ret
= pwrdm_state_switch_nolock(pwrdm
);
1058 pwrdm_unlock(pwrdm
);
1063 int pwrdm_pre_transition(struct powerdomain
*pwrdm
)
1066 _pwrdm_pre_transition_cb(pwrdm
, NULL
);
1068 pwrdm_for_each(_pwrdm_pre_transition_cb
, NULL
);
1073 int pwrdm_post_transition(struct powerdomain
*pwrdm
)
1076 _pwrdm_post_transition_cb(pwrdm
, NULL
);
1078 pwrdm_for_each(_pwrdm_post_transition_cb
, NULL
);
1084 * pwrdm_get_valid_lp_state() - Find best match deep power state
1085 * @pwrdm: power domain for which we want to find best match
1086 * @is_logic_state: Are we looking for logic state match here? Should
1087 * be one of PWRDM_xxx macro values
1088 * @req_state: requested power state
1090 * Returns: closest match for requested power state. default fallback
1091 * is RET for logic state and ON for power state.
1093 * This does a search from the power domain data looking for the
1094 * closest valid power domain state that the hardware can achieve.
1095 * PRCM definitions for PWRSTCTRL allows us to program whatever
1096 * configuration we'd like, and PRCM will actually attempt such
1097 * a transition, however if the powerdomain does not actually support it,
1098 * we endup with a hung system. The valid power domain states are already
1099 * available in our powerdomain data files. So this function tries to do
1101 * a) find if we have an exact match to the request - no issues.
1102 * b) else find if a deeper power state is possible.
1103 * c) failing which, it tries to find closest higher power state for the
1106 u8
pwrdm_get_valid_lp_state(struct powerdomain
*pwrdm
,
1107 bool is_logic_state
, u8 req_state
)
1109 u8 pwrdm_states
= is_logic_state
? pwrdm
->pwrsts_logic_ret
:
1111 /* For logic, ret is highest and others, ON is highest */
1112 u8 default_pwrst
= is_logic_state
? PWRDM_POWER_RET
: PWRDM_POWER_ON
;
1116 /* If it is already supported, nothing to search */
1117 if (pwrdm_states
& BIT(req_state
))
1124 * So, we dont have a exact match
1125 * Can we get a deeper power state match?
1127 new_pwrst
= req_state
- 1;
1129 while (!(pwrdm_states
& BIT(new_pwrst
))) {
1130 /* No match even at OFF? Not available */
1131 if (new_pwrst
== PWRDM_POWER_OFF
) {
1142 /* OK, no deeper ones, can we get a higher match? */
1143 new_pwrst
= req_state
+ 1;
1144 while (!(pwrdm_states
& BIT(new_pwrst
))) {
1145 if (new_pwrst
> PWRDM_POWER_ON
) {
1146 WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
1148 return PWRDM_POWER_ON
;
1151 if (new_pwrst
== default_pwrst
)
1160 * omap_set_pwrdm_state - change a powerdomain's current power state
1161 * @pwrdm: struct powerdomain * to change the power state of
1162 * @pwrst: power state to change to
1164 * Change the current hardware power state of the powerdomain
1165 * represented by @pwrdm to the power state represented by @pwrst.
1166 * Returns -EINVAL if @pwrdm is null or invalid or if the
1167 * powerdomain's current power state could not be read, or returns 0
1168 * upon success or if @pwrdm does not support @pwrst or any
1169 * lower-power state. XXX Should not return 0 if the @pwrdm does not
1170 * support @pwrst or any lower-power state: this should be an error.
1172 int omap_set_pwrdm_state(struct powerdomain
*pwrdm
, u8 pwrst
)
1174 u8 next_pwrst
, sleep_switch
;
1179 if (!pwrdm
|| IS_ERR(pwrdm
))
1182 while (!(pwrdm
->pwrsts
& (1 << pwrst
))) {
1183 if (pwrst
== PWRDM_POWER_OFF
)
1190 curr_pwrst
= pwrdm_read_pwrst(pwrdm
);
1191 if (curr_pwrst
< 0) {
1196 next_pwrst
= pwrdm_read_next_pwrst(pwrdm
);
1197 if (curr_pwrst
== pwrst
&& next_pwrst
== pwrst
)
1200 sleep_switch
= _pwrdm_save_clkdm_state_and_activate(pwrdm
, curr_pwrst
,
1203 ret
= pwrdm_set_next_pwrst(pwrdm
, pwrst
);
1205 pr_err("%s: unable to set power state of powerdomain: %s\n",
1206 __func__
, pwrdm
->name
);
1208 _pwrdm_restore_clkdm_state(pwrdm
, sleep_switch
, hwsup
);
1211 pwrdm_unlock(pwrdm
);
1217 * pwrdm_get_context_loss_count - get powerdomain's context loss count
1218 * @pwrdm: struct powerdomain * to wait for
1220 * Context loss count is the sum of powerdomain off-mode counter, the
1221 * logic off counter and the per-bank memory off counter. Returns negative
1222 * (and WARNs) upon error, otherwise, returns the context loss count.
1224 int pwrdm_get_context_loss_count(struct powerdomain
*pwrdm
)
1229 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__
);
1233 count
= pwrdm
->state_counter
[PWRDM_POWER_OFF
];
1234 count
+= pwrdm
->ret_logic_off_counter
;
1236 for (i
= 0; i
< pwrdm
->banks
; i
++)
1237 count
+= pwrdm
->ret_mem_off_counter
[i
];
1240 * Context loss count has to be a non-negative value. Clear the sign
1241 * bit to get a value range from 0 to INT_MAX.
1245 pr_debug("powerdomain: %s: context loss count = %d\n",
1246 pwrdm
->name
, count
);
1252 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1253 * @pwrdm: struct powerdomain *
1255 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1256 * can lose either memory or logic context or if @pwrdm is invalid, or
1257 * returns 0 otherwise. This function is not concerned with how the
1258 * powerdomain registers are programmed (i.e., to go off or not); it's
1259 * concerned with whether it's ever possible for this powerdomain to
1260 * go off while some other part of the chip is active. This function
1261 * assumes that every powerdomain can go to either ON or INACTIVE.
1263 bool pwrdm_can_ever_lose_context(struct powerdomain
*pwrdm
)
1268 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1273 if (pwrdm
->pwrsts
& PWRSTS_OFF
)
1276 if (pwrdm
->pwrsts
& PWRSTS_RET
) {
1277 if (pwrdm
->pwrsts_logic_ret
& PWRSTS_OFF
)
1280 for (i
= 0; i
< pwrdm
->banks
; i
++)
1281 if (pwrdm
->pwrsts_mem_ret
[i
] & PWRSTS_OFF
)
1285 for (i
= 0; i
< pwrdm
->banks
; i
++)
1286 if (pwrdm
->pwrsts_mem_on
[i
] & PWRSTS_OFF
)