arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / arm / mach-omap2 / powerdomain.c
blob1cbac76136d464e173742e7c694dce58abd395d9
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * OMAP powerdomain control
5 * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
6 * Copyright (C) 2007-2011 Nokia Corporation
8 * Written by Paul Walmsley
9 * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
10 * State counting code by Tero Kristo <tero.kristo@nokia.com>
12 #undef DEBUG
14 #include <linux/cpu_pm.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/string.h>
20 #include <linux/spinlock.h>
21 #include <trace/events/power.h>
23 #include "cm2xxx_3xxx.h"
24 #include "prcm44xx.h"
25 #include "cm44xx.h"
26 #include "prm2xxx_3xxx.h"
27 #include "prm44xx.h"
29 #include <asm/cpu.h>
31 #include "powerdomain.h"
32 #include "clockdomain.h"
33 #include "voltage.h"
35 #include "soc.h"
36 #include "pm.h"
38 #define PWRDM_TRACE_STATES_FLAG (1<<31)
40 void pwrdms_save_context(void);
41 void pwrdms_restore_context(void);
43 enum {
44 PWRDM_STATE_NOW = 0,
45 PWRDM_STATE_PREV,
49 * Types of sleep_switch used internally in omap_set_pwrdm_state()
50 * and its associated static functions
52 * XXX Better documentation is needed here
54 #define ALREADYACTIVE_SWITCH 0
55 #define FORCEWAKEUP_SWITCH 1
56 #define LOWPOWERSTATE_SWITCH 2
58 /* pwrdm_list contains all registered struct powerdomains */
59 static LIST_HEAD(pwrdm_list);
61 static struct pwrdm_ops *arch_pwrdm;
63 /* Private functions */
65 static struct powerdomain *_pwrdm_lookup(const char *name)
67 struct powerdomain *pwrdm, *temp_pwrdm;
69 pwrdm = NULL;
71 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
72 if (!strcmp(name, temp_pwrdm->name)) {
73 pwrdm = temp_pwrdm;
74 break;
78 return pwrdm;
81 /**
82 * _pwrdm_register - register a powerdomain
83 * @pwrdm: struct powerdomain * to register
85 * Adds a powerdomain to the internal powerdomain list. Returns
86 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
87 * already registered by the provided name, or 0 upon success.
89 static int _pwrdm_register(struct powerdomain *pwrdm)
91 int i;
92 struct voltagedomain *voltdm;
94 if (!pwrdm || !pwrdm->name)
95 return -EINVAL;
97 if (cpu_is_omap44xx() &&
98 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
99 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
100 pwrdm->name);
101 return -EINVAL;
104 if (_pwrdm_lookup(pwrdm->name))
105 return -EEXIST;
107 if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
108 if (!arch_pwrdm->pwrdm_has_voltdm())
109 goto skip_voltdm;
111 voltdm = voltdm_lookup(pwrdm->voltdm.name);
112 if (!voltdm) {
113 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
114 pwrdm->name, pwrdm->voltdm.name);
115 return -EINVAL;
117 pwrdm->voltdm.ptr = voltdm;
118 INIT_LIST_HEAD(&pwrdm->voltdm_node);
119 skip_voltdm:
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);
139 return 0;
142 static void _update_logic_membank_counters(struct powerdomain *pwrdm)
144 int i;
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;
166 if (pwrdm == NULL)
167 return -EINVAL;
169 state = pwrdm_read_pwrst(pwrdm);
171 switch (flag) {
172 case PWRDM_STATE_NOW:
173 prev = pwrdm->state;
174 break;
175 case PWRDM_STATE_PREV:
176 prev = pwrdm_read_prev_pwrst(pwrdm);
177 if (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);
186 if (next != prev) {
187 trace_state = (PWRDM_TRACE_STATES_FLAG |
188 ((next & OMAP_POWERSTATE_MASK) << 8) |
189 ((prev & OMAP_POWERSTATE_MASK) << 0));
190 trace_power_domain_target_rcuidle(pwrdm->name,
191 trace_state,
192 raw_smp_processor_id());
194 break;
195 default:
196 return -EINVAL;
199 if (state != prev)
200 pwrdm->state_counter[state]++;
202 pm_dbg_update_time(pwrdm, prev);
204 pwrdm->state = state;
206 return 0;
209 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
211 pwrdm_clear_all_prev_pwrst(pwrdm);
212 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
213 return 0;
216 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
218 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
219 return 0;
223 * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
224 * @pwrdm: struct powerdomain * to operate on
225 * @curr_pwrst: current power state of @pwrdm
226 * @pwrst: power state to switch to
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)
239 u8 sleep_switch;
241 if (curr_pwrst < PWRDM_POWER_ON) {
242 if (curr_pwrst > pwrst &&
243 pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
244 arch_pwrdm->pwrdm_set_lowpwrstchange) {
245 sleep_switch = LOWPOWERSTATE_SWITCH;
246 } else {
247 clkdm_deny_idle_nolock(pwrdm->pwrdm_clkdms[0]);
248 sleep_switch = FORCEWAKEUP_SWITCH;
250 } else {
251 sleep_switch = ALREADYACTIVE_SWITCH;
254 return sleep_switch;
258 * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
259 * @pwrdm: struct powerdomain * to operate on
260 * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
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)
273 switch (sleep_switch) {
274 case FORCEWAKEUP_SWITCH:
275 clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
276 break;
277 case LOWPOWERSTATE_SWITCH:
278 if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
279 arch_pwrdm->pwrdm_set_lowpwrstchange)
280 arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
281 pwrdm_state_switch_nolock(pwrdm);
282 break;
286 /* Public functions */
289 * pwrdm_register_platform_funcs - register powerdomain implementation fns
290 * @po: func pointers for arch specific implementations
292 * Register the list of function pointers used to implement the
293 * powerdomain functions on different OMAP SoCs. Should be called
294 * before any other pwrdm_register*() function. Returns -EINVAL if
295 * @po is null, -EEXIST if platform functions have already been
296 * registered, or 0 upon success.
298 int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
300 if (!po)
301 return -EINVAL;
303 if (arch_pwrdm)
304 return -EEXIST;
306 arch_pwrdm = po;
308 return 0;
312 * pwrdm_register_pwrdms - register SoC powerdomains
313 * @ps: pointer to an array of struct powerdomain to register
315 * Register the powerdomains available on a particular OMAP SoC. Must
316 * be called after pwrdm_register_platform_funcs(). May be called
317 * multiple times. Returns -EACCES if called before
318 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
319 * null; or 0 upon success.
321 int pwrdm_register_pwrdms(struct powerdomain **ps)
323 struct powerdomain **p = NULL;
325 if (!arch_pwrdm)
326 return -EEXIST;
328 if (!ps)
329 return -EINVAL;
331 for (p = ps; *p; p++)
332 _pwrdm_register(*p);
334 return 0;
337 static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
339 switch (cmd) {
340 case CPU_CLUSTER_PM_ENTER:
341 if (enable_off_mode)
342 pwrdms_save_context();
343 break;
344 case CPU_CLUSTER_PM_EXIT:
345 if (enable_off_mode)
346 pwrdms_restore_context();
347 break;
350 return NOTIFY_OK;
354 * pwrdm_complete_init - set up the powerdomain layer
356 * Do whatever is necessary to initialize registered powerdomains and
357 * powerdomain code. Currently, this programs the next power state
358 * for each powerdomain to ON. This prevents powerdomains from
359 * unexpectedly losing context or entering high wakeup latency modes
360 * with non-power-management-enabled kernels. Must be called after
361 * pwrdm_register_pwrdms(). Returns -EACCES if called before
362 * pwrdm_register_pwrdms(), or 0 upon success.
364 int pwrdm_complete_init(void)
366 struct powerdomain *temp_p;
367 static struct notifier_block nb;
369 if (list_empty(&pwrdm_list))
370 return -EACCES;
372 list_for_each_entry(temp_p, &pwrdm_list, node)
373 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
375 /* Only AM43XX can lose pwrdm context during rtc-ddr suspend */
376 if (soc_is_am43xx()) {
377 nb.notifier_call = cpu_notifier;
378 cpu_pm_register_notifier(&nb);
381 return 0;
385 * pwrdm_lock - acquire a Linux spinlock on a powerdomain
386 * @pwrdm: struct powerdomain * to lock
388 * Acquire the powerdomain spinlock on @pwrdm. No return value.
390 void pwrdm_lock(struct powerdomain *pwrdm)
391 __acquires(&pwrdm->_lock)
393 spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
397 * pwrdm_unlock - release a Linux spinlock on a powerdomain
398 * @pwrdm: struct powerdomain * to unlock
400 * Release the powerdomain spinlock on @pwrdm. No return value.
402 void pwrdm_unlock(struct powerdomain *pwrdm)
403 __releases(&pwrdm->_lock)
405 spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
409 * pwrdm_lookup - look up a powerdomain by name, return a pointer
410 * @name: name of powerdomain
412 * Find a registered powerdomain by its name @name. Returns a pointer
413 * to the struct powerdomain if found, or NULL otherwise.
415 struct powerdomain *pwrdm_lookup(const char *name)
417 struct powerdomain *pwrdm;
419 if (!name)
420 return NULL;
422 pwrdm = _pwrdm_lookup(name);
424 return pwrdm;
428 * pwrdm_for_each - call function on each registered clockdomain
429 * @fn: callback function *
431 * Call the supplied function @fn for each registered powerdomain.
432 * The callback function @fn can return anything but 0 to bail out
433 * early from the iterator. Returns the last return value of the
434 * callback function, which should be 0 for success or anything else
435 * to indicate failure; or -EINVAL if the function pointer is null.
437 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
438 void *user)
440 struct powerdomain *temp_pwrdm;
441 int ret = 0;
443 if (!fn)
444 return -EINVAL;
446 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
447 ret = (*fn)(temp_pwrdm, user);
448 if (ret)
449 break;
452 return ret;
456 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
457 * @pwrdm: struct powerdomain * to add the clockdomain to
458 * @clkdm: struct clockdomain * to associate with a powerdomain
460 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
461 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
462 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
463 * or 0 upon success.
465 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
467 int i;
468 int ret = -EINVAL;
470 if (!pwrdm || !clkdm)
471 return -EINVAL;
473 pr_debug("powerdomain: %s: associating clockdomain %s\n",
474 pwrdm->name, clkdm->name);
476 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
477 if (!pwrdm->pwrdm_clkdms[i])
478 break;
479 #ifdef DEBUG
480 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
481 ret = -EINVAL;
482 goto pac_exit;
484 #endif
487 if (i == PWRDM_MAX_CLKDMS) {
488 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
489 pwrdm->name, clkdm->name);
490 WARN_ON(1);
491 ret = -ENOMEM;
492 goto pac_exit;
495 pwrdm->pwrdm_clkdms[i] = clkdm;
497 ret = 0;
499 pac_exit:
500 return ret;
504 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
505 * @pwrdm: struct powerdomain *
507 * Return the number of controllable memory banks in powerdomain @pwrdm,
508 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
510 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
512 if (!pwrdm)
513 return -EINVAL;
515 return pwrdm->banks;
519 * pwrdm_set_next_pwrst - set next powerdomain power state
520 * @pwrdm: struct powerdomain * to set
521 * @pwrst: one of the PWRDM_POWER_* macros
523 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
524 * may not enter this state immediately if the preconditions for this state
525 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
526 * null or if the power state is invalid for the powerdomin, or returns 0
527 * upon success.
529 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
531 int ret = -EINVAL;
533 if (!pwrdm)
534 return -EINVAL;
536 if (!(pwrdm->pwrsts & (1 << pwrst)))
537 return -EINVAL;
539 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
540 pwrdm->name, pwrst);
542 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
543 /* Trace the pwrdm desired target state */
544 trace_power_domain_target_rcuidle(pwrdm->name, pwrst,
545 raw_smp_processor_id());
546 /* Program the pwrdm desired target state */
547 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
550 return ret;
554 * pwrdm_read_next_pwrst - get next powerdomain power state
555 * @pwrdm: struct powerdomain * to get power state
557 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
558 * if the powerdomain pointer is null or returns the next power state
559 * upon success.
561 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
563 int ret = -EINVAL;
565 if (!pwrdm)
566 return -EINVAL;
568 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
569 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
571 return ret;
575 * pwrdm_read_pwrst - get current powerdomain power state
576 * @pwrdm: struct powerdomain * to get power state
578 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
579 * if the powerdomain pointer is null or returns the current power state
580 * upon success. Note that if the power domain only supports the ON state
581 * then just return ON as the current state.
583 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
585 int ret = -EINVAL;
587 if (!pwrdm)
588 return -EINVAL;
590 if (pwrdm->pwrsts == PWRSTS_ON)
591 return PWRDM_POWER_ON;
593 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
594 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
596 return ret;
600 * pwrdm_read_prev_pwrst - get previous powerdomain power state
601 * @pwrdm: struct powerdomain * to get previous power state
603 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
604 * if the powerdomain pointer is null or returns the previous power state
605 * upon success.
607 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
609 int ret = -EINVAL;
611 if (!pwrdm)
612 return -EINVAL;
614 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
615 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
617 return ret;
621 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
622 * @pwrdm: struct powerdomain * to set
623 * @pwrst: one of the PWRDM_POWER_* macros
625 * Set the next power state @pwrst that the logic portion of the
626 * powerdomain @pwrdm will enter when the powerdomain enters retention.
627 * This will be either RETENTION or OFF, if supported. Returns
628 * -EINVAL if the powerdomain pointer is null or the target power
629 * state is not not supported, or returns 0 upon success.
631 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
633 int ret = -EINVAL;
635 if (!pwrdm)
636 return -EINVAL;
638 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
639 return -EINVAL;
641 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
642 pwrdm->name, pwrst);
644 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
645 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
647 return ret;
651 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
652 * @pwrdm: struct powerdomain * to set
653 * @bank: memory bank number to set (0-3)
654 * @pwrst: one of the PWRDM_POWER_* macros
656 * Set the next power state @pwrst that memory bank @bank of the
657 * powerdomain @pwrdm will enter when the powerdomain enters the ON
658 * state. @bank will be a number from 0 to 3, and represents different
659 * types of memory, depending on the powerdomain. Returns -EINVAL if
660 * the powerdomain pointer is null or the target power state is not
661 * not supported for this memory bank, -EEXIST if the target memory
662 * bank does not exist or is not controllable, or returns 0 upon
663 * success.
665 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
667 int ret = -EINVAL;
669 if (!pwrdm)
670 return -EINVAL;
672 if (pwrdm->banks < (bank + 1))
673 return -EEXIST;
675 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
676 return -EINVAL;
678 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
679 pwrdm->name, bank, pwrst);
681 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
682 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
684 return ret;
688 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
689 * @pwrdm: struct powerdomain * to set
690 * @bank: memory bank number to set (0-3)
691 * @pwrst: one of the PWRDM_POWER_* macros
693 * Set the next power state @pwrst that memory bank @bank of the
694 * powerdomain @pwrdm will enter when the powerdomain enters the
695 * RETENTION state. Bank will be a number from 0 to 3, and represents
696 * different types of memory, depending on the powerdomain. @pwrst
697 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
698 * the powerdomain pointer is null or the target power state is not
699 * not supported for this memory bank, -EEXIST if the target memory
700 * bank does not exist or is not controllable, or returns 0 upon
701 * success.
703 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
705 int ret = -EINVAL;
707 if (!pwrdm)
708 return -EINVAL;
710 if (pwrdm->banks < (bank + 1))
711 return -EEXIST;
713 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
714 return -EINVAL;
716 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
717 pwrdm->name, bank, pwrst);
719 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
720 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
722 return ret;
726 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
727 * @pwrdm: struct powerdomain * to get current logic retention power state
729 * Return the power state that the logic portion of powerdomain @pwrdm
730 * will enter when the powerdomain enters retention. Returns -EINVAL
731 * if the powerdomain pointer is null or returns the logic retention
732 * power state upon success.
734 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
736 int ret = -EINVAL;
738 if (!pwrdm)
739 return -EINVAL;
741 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
742 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
744 return ret;
748 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
749 * @pwrdm: struct powerdomain * to get previous logic power state
751 * Return the powerdomain @pwrdm's previous logic power state. Returns
752 * -EINVAL if the powerdomain pointer is null or returns the previous
753 * logic power state upon success.
755 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
757 int ret = -EINVAL;
759 if (!pwrdm)
760 return -EINVAL;
762 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
763 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
765 return ret;
769 * pwrdm_read_logic_retst - get next powerdomain logic power state
770 * @pwrdm: struct powerdomain * to get next logic power state
772 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
773 * if the powerdomain pointer is null or returns the next logic
774 * power state upon success.
776 int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
778 int ret = -EINVAL;
780 if (!pwrdm)
781 return -EINVAL;
783 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
784 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
786 return ret;
790 * pwrdm_read_mem_pwrst - get current memory bank power state
791 * @pwrdm: struct powerdomain * to get current memory bank power state
792 * @bank: memory bank number (0-3)
794 * Return the powerdomain @pwrdm's current memory power state for bank
795 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
796 * the target memory bank does not exist or is not controllable, or
797 * returns the current memory power state upon success.
799 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
801 int ret = -EINVAL;
803 if (!pwrdm)
804 return ret;
806 if (pwrdm->banks < (bank + 1))
807 return ret;
809 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
810 bank = 1;
812 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
813 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
815 return ret;
819 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
820 * @pwrdm: struct powerdomain * to get previous memory bank power state
821 * @bank: memory bank number (0-3)
823 * Return the powerdomain @pwrdm's previous memory power state for
824 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
825 * -EEXIST if the target memory bank does not exist or is not
826 * controllable, or returns the previous memory power state upon
827 * success.
829 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
831 int ret = -EINVAL;
833 if (!pwrdm)
834 return ret;
836 if (pwrdm->banks < (bank + 1))
837 return ret;
839 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
840 bank = 1;
842 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
843 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
845 return ret;
849 * pwrdm_read_mem_retst - get next memory bank power state
850 * @pwrdm: struct powerdomain * to get mext memory bank power state
851 * @bank: memory bank number (0-3)
853 * Return the powerdomain pwrdm's next memory power state for bank
854 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
855 * the target memory bank does not exist or is not controllable, or
856 * returns the next memory power state upon success.
858 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
860 int ret = -EINVAL;
862 if (!pwrdm)
863 return ret;
865 if (pwrdm->banks < (bank + 1))
866 return ret;
868 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
869 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
871 return ret;
875 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
876 * @pwrdm: struct powerdomain * to clear
878 * Clear the powerdomain's previous power state register @pwrdm.
879 * Clears the entire register, including logic and memory bank
880 * previous power states. Returns -EINVAL if the powerdomain pointer
881 * is null, or returns 0 upon success.
883 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
885 int ret = -EINVAL;
887 if (!pwrdm)
888 return ret;
891 * XXX should get the powerdomain's current state here;
892 * warn & fail if it is not ON.
895 pr_debug("powerdomain: %s: clearing previous power state reg\n",
896 pwrdm->name);
898 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
899 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
901 return ret;
905 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
906 * @pwrdm: struct powerdomain *
908 * Enable automatic context save-and-restore upon power state change
909 * for some devices in the powerdomain @pwrdm. Warning: this only
910 * affects a subset of devices in a powerdomain; check the TRM
911 * closely. Returns -EINVAL if the powerdomain pointer is null or if
912 * the powerdomain does not support automatic save-and-restore, or
913 * returns 0 upon success.
915 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
917 int ret = -EINVAL;
919 if (!pwrdm)
920 return ret;
922 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
923 return ret;
925 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
927 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
928 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
930 return ret;
934 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
935 * @pwrdm: struct powerdomain *
937 * Disable automatic context save-and-restore upon power state change
938 * for some devices in the powerdomain @pwrdm. Warning: this only
939 * affects a subset of devices in a powerdomain; check the TRM
940 * closely. Returns -EINVAL if the powerdomain pointer is null or if
941 * the powerdomain does not support automatic save-and-restore, or
942 * returns 0 upon success.
944 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
946 int ret = -EINVAL;
948 if (!pwrdm)
949 return ret;
951 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
952 return ret;
954 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
956 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
957 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
959 return ret;
963 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
964 * @pwrdm: struct powerdomain *
966 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
967 * for some devices, or 0 if it does not.
969 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
971 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
974 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
976 int ret;
978 if (!pwrdm || !arch_pwrdm)
979 return -EINVAL;
981 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
982 if (!ret)
983 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
985 return ret;
988 int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
990 int ret;
992 pwrdm_lock(pwrdm);
993 ret = pwrdm_state_switch_nolock(pwrdm);
994 pwrdm_unlock(pwrdm);
996 return ret;
999 int pwrdm_pre_transition(struct powerdomain *pwrdm)
1001 if (pwrdm)
1002 _pwrdm_pre_transition_cb(pwrdm, NULL);
1003 else
1004 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
1006 return 0;
1009 int pwrdm_post_transition(struct powerdomain *pwrdm)
1011 if (pwrdm)
1012 _pwrdm_post_transition_cb(pwrdm, NULL);
1013 else
1014 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
1016 return 0;
1020 * pwrdm_get_valid_lp_state() - Find best match deep power state
1021 * @pwrdm: power domain for which we want to find best match
1022 * @is_logic_state: Are we looking for logic state match here? Should
1023 * be one of PWRDM_xxx macro values
1024 * @req_state: requested power state
1026 * Returns: closest match for requested power state. default fallback
1027 * is RET for logic state and ON for power state.
1029 * This does a search from the power domain data looking for the
1030 * closest valid power domain state that the hardware can achieve.
1031 * PRCM definitions for PWRSTCTRL allows us to program whatever
1032 * configuration we'd like, and PRCM will actually attempt such
1033 * a transition, however if the powerdomain does not actually support it,
1034 * we endup with a hung system. The valid power domain states are already
1035 * available in our powerdomain data files. So this function tries to do
1036 * the following:
1037 * a) find if we have an exact match to the request - no issues.
1038 * b) else find if a deeper power state is possible.
1039 * c) failing which, it tries to find closest higher power state for the
1040 * request.
1042 u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
1043 bool is_logic_state, u8 req_state)
1045 u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
1046 pwrdm->pwrsts;
1047 /* For logic, ret is highest and others, ON is highest */
1048 u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
1049 u8 new_pwrst;
1050 bool found;
1052 /* If it is already supported, nothing to search */
1053 if (pwrdm_states & BIT(req_state))
1054 return req_state;
1056 if (!req_state)
1057 goto up_search;
1060 * So, we dont have a exact match
1061 * Can we get a deeper power state match?
1063 new_pwrst = req_state - 1;
1064 found = true;
1065 while (!(pwrdm_states & BIT(new_pwrst))) {
1066 /* No match even at OFF? Not available */
1067 if (new_pwrst == PWRDM_POWER_OFF) {
1068 found = false;
1069 break;
1071 new_pwrst--;
1074 if (found)
1075 goto done;
1077 up_search:
1078 /* OK, no deeper ones, can we get a higher match? */
1079 new_pwrst = req_state + 1;
1080 while (!(pwrdm_states & BIT(new_pwrst))) {
1081 if (new_pwrst > PWRDM_POWER_ON) {
1082 WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
1083 pwrdm->name);
1084 return PWRDM_POWER_ON;
1087 if (new_pwrst == default_pwrst)
1088 break;
1089 new_pwrst++;
1091 done:
1092 return new_pwrst;
1096 * omap_set_pwrdm_state - change a powerdomain's current power state
1097 * @pwrdm: struct powerdomain * to change the power state of
1098 * @pwrst: power state to change to
1100 * Change the current hardware power state of the powerdomain
1101 * represented by @pwrdm to the power state represented by @pwrst.
1102 * Returns -EINVAL if @pwrdm is null or invalid or if the
1103 * powerdomain's current power state could not be read, or returns 0
1104 * upon success or if @pwrdm does not support @pwrst or any
1105 * lower-power state. XXX Should not return 0 if the @pwrdm does not
1106 * support @pwrst or any lower-power state: this should be an error.
1108 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
1110 u8 next_pwrst, sleep_switch;
1111 int curr_pwrst;
1112 int ret = 0;
1114 if (!pwrdm || IS_ERR(pwrdm))
1115 return -EINVAL;
1117 while (!(pwrdm->pwrsts & (1 << pwrst))) {
1118 if (pwrst == PWRDM_POWER_OFF)
1119 return ret;
1120 pwrst--;
1123 pwrdm_lock(pwrdm);
1125 curr_pwrst = pwrdm_read_pwrst(pwrdm);
1126 if (curr_pwrst < 0) {
1127 ret = -EINVAL;
1128 goto osps_out;
1131 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
1132 if (curr_pwrst == pwrst && next_pwrst == pwrst)
1133 goto osps_out;
1135 sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
1136 pwrst);
1138 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
1139 if (ret)
1140 pr_err("%s: unable to set power state of powerdomain: %s\n",
1141 __func__, pwrdm->name);
1143 _pwrdm_restore_clkdm_state(pwrdm, sleep_switch);
1145 osps_out:
1146 pwrdm_unlock(pwrdm);
1148 return ret;
1152 * pwrdm_get_context_loss_count - get powerdomain's context loss count
1153 * @pwrdm: struct powerdomain * to wait for
1155 * Context loss count is the sum of powerdomain off-mode counter, the
1156 * logic off counter and the per-bank memory off counter. Returns negative
1157 * (and WARNs) upon error, otherwise, returns the context loss count.
1159 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
1161 int i, count;
1163 if (!pwrdm) {
1164 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
1165 return -ENODEV;
1168 count = pwrdm->state_counter[PWRDM_POWER_OFF];
1169 count += pwrdm->ret_logic_off_counter;
1171 for (i = 0; i < pwrdm->banks; i++)
1172 count += pwrdm->ret_mem_off_counter[i];
1175 * Context loss count has to be a non-negative value. Clear the sign
1176 * bit to get a value range from 0 to INT_MAX.
1178 count &= INT_MAX;
1180 pr_debug("powerdomain: %s: context loss count = %d\n",
1181 pwrdm->name, count);
1183 return count;
1187 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1188 * @pwrdm: struct powerdomain *
1190 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1191 * can lose either memory or logic context or if @pwrdm is invalid, or
1192 * returns 0 otherwise. This function is not concerned with how the
1193 * powerdomain registers are programmed (i.e., to go off or not); it's
1194 * concerned with whether it's ever possible for this powerdomain to
1195 * go off while some other part of the chip is active. This function
1196 * assumes that every powerdomain can go to either ON or INACTIVE.
1198 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
1200 int i;
1202 if (!pwrdm) {
1203 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1204 __func__);
1205 return 1;
1208 if (pwrdm->pwrsts & PWRSTS_OFF)
1209 return 1;
1211 if (pwrdm->pwrsts & PWRSTS_RET) {
1212 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
1213 return 1;
1215 for (i = 0; i < pwrdm->banks; i++)
1216 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1217 return 1;
1220 for (i = 0; i < pwrdm->banks; i++)
1221 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
1222 return 1;
1224 return 0;
1228 * pwrdm_save_context - save powerdomain registers
1230 * Register state is going to be lost due to a suspend or hibernate
1231 * event. Save the powerdomain registers.
1233 static int pwrdm_save_context(struct powerdomain *pwrdm, void *unused)
1235 if (arch_pwrdm && arch_pwrdm->pwrdm_save_context)
1236 arch_pwrdm->pwrdm_save_context(pwrdm);
1237 return 0;
1241 * pwrdm_save_context - restore powerdomain registers
1243 * Restore powerdomain control registers after a suspend or resume
1244 * event.
1246 static int pwrdm_restore_context(struct powerdomain *pwrdm, void *unused)
1248 if (arch_pwrdm && arch_pwrdm->pwrdm_restore_context)
1249 arch_pwrdm->pwrdm_restore_context(pwrdm);
1250 return 0;
1253 static int pwrdm_lost_power(struct powerdomain *pwrdm, void *unused)
1255 int state;
1258 * Power has been lost across all powerdomains, increment the
1259 * counter.
1262 state = pwrdm_read_pwrst(pwrdm);
1263 if (state != PWRDM_POWER_OFF) {
1264 pwrdm->state_counter[state]++;
1265 pwrdm->state_counter[PWRDM_POWER_OFF]++;
1267 pwrdm->state = state;
1269 return 0;
1272 void pwrdms_save_context(void)
1274 pwrdm_for_each(pwrdm_save_context, NULL);
1277 void pwrdms_restore_context(void)
1279 pwrdm_for_each(pwrdm_restore_context, NULL);
1282 void pwrdms_lost_power(void)
1284 pwrdm_for_each(pwrdm_lost_power, NULL);