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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP powerdomain control
4 *
5 * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
6 * Copyright (C) 2007-2011 Nokia Corporation
7 *
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>
11 */
12#undef DEBUG
13
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>
22
23#include "cm2xxx_3xxx.h"
24#include "prcm44xx.h"
25#include "cm44xx.h"
26#include "prm2xxx_3xxx.h"
27#include "prm44xx.h"
28
29#include <asm/cpu.h>
30
31#include "powerdomain.h"
32#include "clockdomain.h"
33#include "voltage.h"
34
35#include "soc.h"
36#include "pm.h"
37
38#define PWRDM_TRACE_STATES_FLAG (1<<31)
39
40static void pwrdms_save_context(void);
41static void pwrdms_restore_context(void);
42
43enum {
44 PWRDM_STATE_NOW = 0,
45 PWRDM_STATE_PREV,
46};
47
48/*
49 * Types of sleep_switch used internally in omap_set_pwrdm_state()
50 * and its associated static functions
51 *
52 * XXX Better documentation is needed here
53 */
54#define ALREADYACTIVE_SWITCH 0
55#define FORCEWAKEUP_SWITCH 1
56#define LOWPOWERSTATE_SWITCH 2
57
58/* pwrdm_list contains all registered struct powerdomains */
59static LIST_HEAD(pwrdm_list);
60
61static struct pwrdm_ops *arch_pwrdm;
62
63/* Private functions */
64
65static struct powerdomain *_pwrdm_lookup(const char *name)
66{
67 struct powerdomain *pwrdm, *temp_pwrdm;
68
69 pwrdm = NULL;
70
71 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
72 if (!strcmp(name, temp_pwrdm->name)) {
73 pwrdm = temp_pwrdm;
74 break;
75 }
76 }
77
78 return pwrdm;
79}
80
81/**
82 * _pwrdm_register - register a powerdomain
83 * @pwrdm: struct powerdomain * to register
84 *
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.
88 */
89static int _pwrdm_register(struct powerdomain *pwrdm)
90{
91 int i;
92 struct voltagedomain *voltdm;
93
94 if (!pwrdm || !pwrdm->name)
95 return -EINVAL;
96
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;
102 }
103
104 if (_pwrdm_lookup(pwrdm->name))
105 return -EEXIST;
106
107 if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
108 if (!arch_pwrdm->pwrdm_has_voltdm())
109 goto skip_voltdm;
110
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;
116 }
117 pwrdm->voltdm.ptr = voltdm;
118 INIT_LIST_HEAD(&pwrdm->voltdm_node);
119skip_voltdm:
120 spin_lock_init(&pwrdm->_lock);
121
122 list_add(&pwrdm->node, &pwrdm_list);
123
124 /* Initialize the powerdomain's state counter */
125 for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
126 pwrdm->state_counter[i] = 0;
127
128 pwrdm->ret_logic_off_counter = 0;
129 for (i = 0; i < pwrdm->banks; i++)
130 pwrdm->ret_mem_off_counter[i] = 0;
131
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;
136
137 pr_debug("powerdomain: registered %s\n", pwrdm->name);
138
139 return 0;
140}
141
142static void _update_logic_membank_counters(struct powerdomain *pwrdm)
143{
144 int i;
145 u8 prev_logic_pwrst, prev_mem_pwrst;
146
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++;
151
152 for (i = 0; i < pwrdm->banks; i++) {
153 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
154
155 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
156 (prev_mem_pwrst == PWRDM_POWER_OFF))
157 pwrdm->ret_mem_off_counter[i]++;
158 }
159}
160
161static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
162{
163
164 int prev, next, state, trace_state = 0;
165
166 if (pwrdm == NULL)
167 return -EINVAL;
168
169 state = pwrdm_read_pwrst(pwrdm);
170
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 (prev >= 0 && pwrdm->state != prev)
178 pwrdm->state_counter[prev]++;
179 if (prev == PWRDM_POWER_RET)
180 _update_logic_membank_counters(pwrdm);
181 /*
182 * If the power domain did not hit the desired state,
183 * generate a trace event with both the desired and hit states
184 */
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(pwrdm->name,
191 trace_state,
192 raw_smp_processor_id());
193 }
194 break;
195 default:
196 return -EINVAL;
197 }
198
199 if (state != prev)
200 pwrdm->state_counter[state]++;
201
202 pm_dbg_update_time(pwrdm, prev);
203
204 pwrdm->state = state;
205
206 return 0;
207}
208
209static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
210{
211 pwrdm_clear_all_prev_pwrst(pwrdm);
212 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
213 return 0;
214}
215
216static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
217{
218 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
219 return 0;
220}
221
222/**
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
227 *
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).
235 */
236static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
237 u8 curr_pwrst, u8 pwrst)
238{
239 u8 sleep_switch;
240
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;
249 }
250 } else {
251 sleep_switch = ALREADYACTIVE_SWITCH;
252 }
253
254 return sleep_switch;
255}
256
257/**
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()
261 *
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.
269 */
270static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
271 u8 sleep_switch)
272{
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;
283 }
284}
285
286/* Public functions */
287
288/**
289 * pwrdm_register_platform_funcs - register powerdomain implementation fns
290 * @po: func pointers for arch specific implementations
291 *
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.
297 */
298int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
299{
300 if (!po)
301 return -EINVAL;
302
303 if (arch_pwrdm)
304 return -EEXIST;
305
306 arch_pwrdm = po;
307
308 return 0;
309}
310
311/**
312 * pwrdm_register_pwrdms - register SoC powerdomains
313 * @ps: pointer to an array of struct powerdomain to register
314 *
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.
320 */
321int pwrdm_register_pwrdms(struct powerdomain **ps)
322{
323 struct powerdomain **p = NULL;
324
325 if (!arch_pwrdm)
326 return -EEXIST;
327
328 if (!ps)
329 return -EINVAL;
330
331 for (p = ps; *p; p++)
332 _pwrdm_register(*p);
333
334 return 0;
335}
336
337static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
338{
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;
348 }
349
350 return NOTIFY_OK;
351}
352
353/**
354 * pwrdm_complete_init - set up the powerdomain layer
355 *
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.
363 */
364int pwrdm_complete_init(void)
365{
366 struct powerdomain *temp_p;
367 static struct notifier_block nb;
368
369 if (list_empty(&pwrdm_list))
370 return -EACCES;
371
372 list_for_each_entry(temp_p, &pwrdm_list, node)
373 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
374
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);
379 }
380
381 return 0;
382}
383
384/**
385 * pwrdm_lock - acquire a Linux spinlock on a powerdomain
386 * @pwrdm: struct powerdomain * to lock
387 *
388 * Acquire the powerdomain spinlock on @pwrdm. No return value.
389 */
390void pwrdm_lock(struct powerdomain *pwrdm)
391 __acquires(&pwrdm->_lock)
392{
393 spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
394}
395
396/**
397 * pwrdm_unlock - release a Linux spinlock on a powerdomain
398 * @pwrdm: struct powerdomain * to unlock
399 *
400 * Release the powerdomain spinlock on @pwrdm. No return value.
401 */
402void pwrdm_unlock(struct powerdomain *pwrdm)
403 __releases(&pwrdm->_lock)
404{
405 spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
406}
407
408/**
409 * pwrdm_lookup - look up a powerdomain by name, return a pointer
410 * @name: name of powerdomain
411 *
412 * Find a registered powerdomain by its name @name. Returns a pointer
413 * to the struct powerdomain if found, or NULL otherwise.
414 */
415struct powerdomain *pwrdm_lookup(const char *name)
416{
417 struct powerdomain *pwrdm;
418
419 if (!name)
420 return NULL;
421
422 pwrdm = _pwrdm_lookup(name);
423
424 return pwrdm;
425}
426
427/**
428 * pwrdm_for_each - call function on each registered clockdomain
429 * @fn: callback function *
430 *
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.
436 */
437int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
438 void *user)
439{
440 struct powerdomain *temp_pwrdm;
441 int ret = 0;
442
443 if (!fn)
444 return -EINVAL;
445
446 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
447 ret = (*fn)(temp_pwrdm, user);
448 if (ret)
449 break;
450 }
451
452 return ret;
453}
454
455/**
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
459 *
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.
464 */
465int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
466{
467 int i;
468 int ret = -EINVAL;
469
470 if (!pwrdm || !clkdm)
471 return -EINVAL;
472
473 pr_debug("powerdomain: %s: associating clockdomain %s\n",
474 pwrdm->name, clkdm->name);
475
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;
483 }
484#endif
485 }
486
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;
493 }
494
495 pwrdm->pwrdm_clkdms[i] = clkdm;
496
497 ret = 0;
498
499pac_exit:
500 return ret;
501}
502
503/**
504 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
505 * @pwrdm: struct powerdomain *
506 *
507 * Return the number of controllable memory banks in powerdomain @pwrdm,
508 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
509 */
510int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
511{
512 if (!pwrdm)
513 return -EINVAL;
514
515 return pwrdm->banks;
516}
517
518/**
519 * pwrdm_set_next_pwrst - set next powerdomain power state
520 * @pwrdm: struct powerdomain * to set
521 * @pwrst: one of the PWRDM_POWER_* macros
522 *
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.
528 */
529int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
530{
531 int ret = -EINVAL;
532
533 if (!pwrdm)
534 return -EINVAL;
535
536 if (!(pwrdm->pwrsts & (1 << pwrst)))
537 return -EINVAL;
538
539 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
540 pwrdm->name, pwrst);
541
542 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
543 /* Trace the pwrdm desired target state */
544 trace_power_domain_target(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);
548 }
549
550 return ret;
551}
552
553/**
554 * pwrdm_read_next_pwrst - get next powerdomain power state
555 * @pwrdm: struct powerdomain * to get power state
556 *
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.
560 */
561int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
562{
563 int ret = -EINVAL;
564
565 if (!pwrdm)
566 return -EINVAL;
567
568 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
569 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
570
571 return ret;
572}
573
574/**
575 * pwrdm_read_pwrst - get current powerdomain power state
576 * @pwrdm: struct powerdomain * to get power state
577 *
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.
582 */
583int pwrdm_read_pwrst(struct powerdomain *pwrdm)
584{
585 int ret = -EINVAL;
586
587 if (!pwrdm)
588 return -EINVAL;
589
590 if (pwrdm->pwrsts == PWRSTS_ON)
591 return PWRDM_POWER_ON;
592
593 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
594 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
595
596 return ret;
597}
598
599/**
600 * pwrdm_read_prev_pwrst - get previous powerdomain power state
601 * @pwrdm: struct powerdomain * to get previous power state
602 *
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.
606 */
607int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
608{
609 int ret = -EINVAL;
610
611 if (!pwrdm)
612 return -EINVAL;
613
614 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
615 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
616
617 return ret;
618}
619
620/**
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
624 *
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 supported, or returns 0 upon success.
630 */
631int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
632{
633 int ret = -EINVAL;
634
635 if (!pwrdm)
636 return -EINVAL;
637
638 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
639 return -EINVAL;
640
641 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
642 pwrdm->name, pwrst);
643
644 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
645 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
646
647 return ret;
648}
649
650/**
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
655 *
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 * 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.
664 */
665int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
666{
667 int ret = -EINVAL;
668
669 if (!pwrdm)
670 return -EINVAL;
671
672 if (pwrdm->banks < (bank + 1))
673 return -EEXIST;
674
675 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
676 return -EINVAL;
677
678 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
679 pwrdm->name, bank, pwrst);
680
681 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
682 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
683
684 return ret;
685}
686
687/**
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
692 *
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 * 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.
702 */
703int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
704{
705 int ret = -EINVAL;
706
707 if (!pwrdm)
708 return -EINVAL;
709
710 if (pwrdm->banks < (bank + 1))
711 return -EEXIST;
712
713 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
714 return -EINVAL;
715
716 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
717 pwrdm->name, bank, pwrst);
718
719 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
720 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
721
722 return ret;
723}
724
725/**
726 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
727 * @pwrdm: struct powerdomain * to get current logic retention power state
728 *
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.
733 */
734int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
735{
736 int ret = -EINVAL;
737
738 if (!pwrdm)
739 return -EINVAL;
740
741 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
742 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
743
744 return ret;
745}
746
747/**
748 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
749 * @pwrdm: struct powerdomain * to get previous logic power state
750 *
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.
754 */
755int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
756{
757 int ret = -EINVAL;
758
759 if (!pwrdm)
760 return -EINVAL;
761
762 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
763 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
764
765 return ret;
766}
767
768/**
769 * pwrdm_read_logic_retst - get next powerdomain logic power state
770 * @pwrdm: struct powerdomain * to get next logic power state
771 *
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.
775 */
776int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
777{
778 int ret = -EINVAL;
779
780 if (!pwrdm)
781 return -EINVAL;
782
783 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
784 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
785
786 return ret;
787}
788
789/**
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)
793 *
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.
798 */
799int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
800{
801 int ret = -EINVAL;
802
803 if (!pwrdm)
804 return ret;
805
806 if (pwrdm->banks < (bank + 1))
807 return ret;
808
809 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
810 bank = 1;
811
812 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
813 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
814
815 return ret;
816}
817
818/**
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)
822 *
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.
828 */
829int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
830{
831 int ret = -EINVAL;
832
833 if (!pwrdm)
834 return ret;
835
836 if (pwrdm->banks < (bank + 1))
837 return ret;
838
839 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
840 bank = 1;
841
842 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
843 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
844
845 return ret;
846}
847
848/**
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)
852 *
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.
857 */
858int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
859{
860 int ret = -EINVAL;
861
862 if (!pwrdm)
863 return ret;
864
865 if (pwrdm->banks < (bank + 1))
866 return ret;
867
868 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
869 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
870
871 return ret;
872}
873
874/**
875 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
876 * @pwrdm: struct powerdomain * to clear
877 *
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.
882 */
883int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
884{
885 int ret = -EINVAL;
886
887 if (!pwrdm)
888 return ret;
889
890 /*
891 * XXX should get the powerdomain's current state here;
892 * warn & fail if it is not ON.
893 */
894
895 pr_debug("powerdomain: %s: clearing previous power state reg\n",
896 pwrdm->name);
897
898 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
899 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
900
901 return ret;
902}
903
904/**
905 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
906 * @pwrdm: struct powerdomain *
907 *
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.
914 */
915int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
916{
917 int ret = -EINVAL;
918
919 if (!pwrdm)
920 return ret;
921
922 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
923 return ret;
924
925 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
926
927 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
928 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
929
930 return ret;
931}
932
933/**
934 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
935 * @pwrdm: struct powerdomain *
936 *
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.
943 */
944int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
945{
946 int ret = -EINVAL;
947
948 if (!pwrdm)
949 return ret;
950
951 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
952 return ret;
953
954 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
955
956 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
957 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
958
959 return ret;
960}
961
962/**
963 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
964 * @pwrdm: struct powerdomain *
965 *
966 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
967 * for some devices, or 0 if it does not.
968 */
969bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
970{
971 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
972}
973
974int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
975{
976 int ret;
977
978 if (!pwrdm || !arch_pwrdm)
979 return -EINVAL;
980
981 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
982 if (!ret)
983 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
984
985 return ret;
986}
987
988int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
989{
990 int ret;
991
992 pwrdm_lock(pwrdm);
993 ret = pwrdm_state_switch_nolock(pwrdm);
994 pwrdm_unlock(pwrdm);
995
996 return ret;
997}
998
999int pwrdm_pre_transition(struct powerdomain *pwrdm)
1000{
1001 if (pwrdm)
1002 _pwrdm_pre_transition_cb(pwrdm, NULL);
1003 else
1004 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
1005
1006 return 0;
1007}
1008
1009int pwrdm_post_transition(struct powerdomain *pwrdm)
1010{
1011 if (pwrdm)
1012 _pwrdm_post_transition_cb(pwrdm, NULL);
1013 else
1014 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
1015
1016 return 0;
1017}
1018
1019/**
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
1025 *
1026 * Returns: closest match for requested power state. default fallback
1027 * is RET for logic state and ON for power state.
1028 *
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.
1041 */
1042u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
1043 bool is_logic_state, u8 req_state)
1044{
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;
1051
1052 /* If it is already supported, nothing to search */
1053 if (pwrdm_states & BIT(req_state))
1054 return req_state;
1055
1056 if (!req_state)
1057 goto up_search;
1058
1059 /*
1060 * So, we dont have a exact match
1061 * Can we get a deeper power state match?
1062 */
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;
1070 }
1071 new_pwrst--;
1072 }
1073
1074 if (found)
1075 goto done;
1076
1077up_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;
1085 }
1086
1087 if (new_pwrst == default_pwrst)
1088 break;
1089 new_pwrst++;
1090 }
1091done:
1092 return new_pwrst;
1093}
1094
1095/**
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
1099 *
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.
1107 */
1108int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
1109{
1110 u8 next_pwrst, sleep_switch;
1111 int curr_pwrst;
1112 int ret = 0;
1113
1114 if (!pwrdm || IS_ERR(pwrdm))
1115 return -EINVAL;
1116
1117 while (!(pwrdm->pwrsts & (1 << pwrst))) {
1118 if (pwrst == PWRDM_POWER_OFF)
1119 return ret;
1120 pwrst--;
1121 }
1122
1123 pwrdm_lock(pwrdm);
1124
1125 curr_pwrst = pwrdm_read_pwrst(pwrdm);
1126 if (curr_pwrst < 0) {
1127 ret = -EINVAL;
1128 goto osps_out;
1129 }
1130
1131 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
1132 if (curr_pwrst == pwrst && next_pwrst == pwrst)
1133 goto osps_out;
1134
1135 sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
1136 pwrst);
1137
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);
1142
1143 _pwrdm_restore_clkdm_state(pwrdm, sleep_switch);
1144
1145osps_out:
1146 pwrdm_unlock(pwrdm);
1147
1148 return ret;
1149}
1150
1151/**
1152 * pwrdm_save_context - save powerdomain registers
1153 *
1154 * Register state is going to be lost due to a suspend or hibernate
1155 * event. Save the powerdomain registers.
1156 */
1157static int pwrdm_save_context(struct powerdomain *pwrdm, void *unused)
1158{
1159 if (arch_pwrdm && arch_pwrdm->pwrdm_save_context)
1160 arch_pwrdm->pwrdm_save_context(pwrdm);
1161 return 0;
1162}
1163
1164/**
1165 * pwrdm_restore_context - restore powerdomain registers
1166 *
1167 * Restore powerdomain control registers after a suspend or resume
1168 * event.
1169 */
1170static int pwrdm_restore_context(struct powerdomain *pwrdm, void *unused)
1171{
1172 if (arch_pwrdm && arch_pwrdm->pwrdm_restore_context)
1173 arch_pwrdm->pwrdm_restore_context(pwrdm);
1174 return 0;
1175}
1176
1177static void pwrdms_save_context(void)
1178{
1179 pwrdm_for_each(pwrdm_save_context, NULL);
1180}
1181
1182static void pwrdms_restore_context(void)
1183{
1184 pwrdm_for_each(pwrdm_restore_context, NULL);
1185}
1/*
2 * OMAP powerdomain control
3 *
4 * Copyright (C) 2007-2008 Texas Instruments, Inc.
5 * Copyright (C) 2007-2011 Nokia Corporation
6 *
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>
10 *
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.
14 */
15#undef DEBUG
16
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/list.h>
20#include <linux/errno.h>
21#include <linux/string.h>
22#include <trace/events/power.h>
23
24#include "cm2xxx_3xxx.h"
25#include "prcm44xx.h"
26#include "cm44xx.h"
27#include "prm2xxx_3xxx.h"
28#include "prm44xx.h"
29
30#include <asm/cpu.h>
31#include <plat/cpu.h>
32#include "powerdomain.h"
33#include "clockdomain.h"
34#include <plat/prcm.h>
35
36#include "pm.h"
37
38#define PWRDM_TRACE_STATES_FLAG (1<<31)
39
40enum {
41 PWRDM_STATE_NOW = 0,
42 PWRDM_STATE_PREV,
43};
44
45
46/* pwrdm_list contains all registered struct powerdomains */
47static LIST_HEAD(pwrdm_list);
48
49static struct pwrdm_ops *arch_pwrdm;
50
51/* Private functions */
52
53static struct powerdomain *_pwrdm_lookup(const char *name)
54{
55 struct powerdomain *pwrdm, *temp_pwrdm;
56
57 pwrdm = NULL;
58
59 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
60 if (!strcmp(name, temp_pwrdm->name)) {
61 pwrdm = temp_pwrdm;
62 break;
63 }
64 }
65
66 return pwrdm;
67}
68
69/**
70 * _pwrdm_register - register a powerdomain
71 * @pwrdm: struct powerdomain * to register
72 *
73 * Adds a powerdomain to the internal powerdomain list. Returns
74 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
75 * already registered by the provided name, or 0 upon success.
76 */
77static int _pwrdm_register(struct powerdomain *pwrdm)
78{
79 int i;
80
81 if (!pwrdm || !pwrdm->name)
82 return -EINVAL;
83
84 if (!omap_chip_is(pwrdm->omap_chip))
85 return -EINVAL;
86
87 if (cpu_is_omap44xx() &&
88 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
89 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
90 pwrdm->name);
91 return -EINVAL;
92 }
93
94 if (_pwrdm_lookup(pwrdm->name))
95 return -EEXIST;
96
97 list_add(&pwrdm->node, &pwrdm_list);
98
99 /* Initialize the powerdomain's state counter */
100 for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
101 pwrdm->state_counter[i] = 0;
102
103 pwrdm->ret_logic_off_counter = 0;
104 for (i = 0; i < pwrdm->banks; i++)
105 pwrdm->ret_mem_off_counter[i] = 0;
106
107 pwrdm_wait_transition(pwrdm);
108 pwrdm->state = pwrdm_read_pwrst(pwrdm);
109 pwrdm->state_counter[pwrdm->state] = 1;
110
111 pr_debug("powerdomain: registered %s\n", pwrdm->name);
112
113 return 0;
114}
115
116static void _update_logic_membank_counters(struct powerdomain *pwrdm)
117{
118 int i;
119 u8 prev_logic_pwrst, prev_mem_pwrst;
120
121 prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
122 if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
123 (prev_logic_pwrst == PWRDM_POWER_OFF))
124 pwrdm->ret_logic_off_counter++;
125
126 for (i = 0; i < pwrdm->banks; i++) {
127 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
128
129 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
130 (prev_mem_pwrst == PWRDM_POWER_OFF))
131 pwrdm->ret_mem_off_counter[i]++;
132 }
133}
134
135static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
136{
137
138 int prev, state, trace_state = 0;
139
140 if (pwrdm == NULL)
141 return -EINVAL;
142
143 state = pwrdm_read_pwrst(pwrdm);
144
145 switch (flag) {
146 case PWRDM_STATE_NOW:
147 prev = pwrdm->state;
148 break;
149 case PWRDM_STATE_PREV:
150 prev = pwrdm_read_prev_pwrst(pwrdm);
151 if (pwrdm->state != prev)
152 pwrdm->state_counter[prev]++;
153 if (prev == PWRDM_POWER_RET)
154 _update_logic_membank_counters(pwrdm);
155 /*
156 * If the power domain did not hit the desired state,
157 * generate a trace event with both the desired and hit states
158 */
159 if (state != prev) {
160 trace_state = (PWRDM_TRACE_STATES_FLAG |
161 ((state & OMAP_POWERSTATE_MASK) << 8) |
162 ((prev & OMAP_POWERSTATE_MASK) << 0));
163 trace_power_domain_target(pwrdm->name, trace_state,
164 smp_processor_id());
165 }
166 break;
167 default:
168 return -EINVAL;
169 }
170
171 if (state != prev)
172 pwrdm->state_counter[state]++;
173
174 pm_dbg_update_time(pwrdm, prev);
175
176 pwrdm->state = state;
177
178 return 0;
179}
180
181static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
182{
183 pwrdm_clear_all_prev_pwrst(pwrdm);
184 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
185 return 0;
186}
187
188static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
189{
190 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
191 return 0;
192}
193
194/* Public functions */
195
196/**
197 * pwrdm_init - set up the powerdomain layer
198 * @pwrdms: array of struct powerdomain pointers to register
199 * @custom_funcs: func pointers for arch specific implementations
200 *
201 * Loop through the array of powerdomains @pwrdms, registering all
202 * that are available on the current CPU. Also, program all
203 * powerdomain target state as ON; this is to prevent domains from
204 * hitting low power states (if bootloader has target states set to
205 * something other than ON) and potentially even losing context while
206 * PM is not fully initialized. The PM late init code can then program
207 * the desired target state for all the power domains. No return
208 * value.
209 */
210void pwrdm_init(struct powerdomain **pwrdms, struct pwrdm_ops *custom_funcs)
211{
212 struct powerdomain **p = NULL;
213 struct powerdomain *temp_p;
214
215 if (!custom_funcs)
216 WARN(1, "powerdomain: No custom pwrdm functions registered\n");
217 else
218 arch_pwrdm = custom_funcs;
219
220 if (pwrdms) {
221 for (p = pwrdms; *p; p++)
222 _pwrdm_register(*p);
223 }
224
225 list_for_each_entry(temp_p, &pwrdm_list, node)
226 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
227}
228
229/**
230 * pwrdm_lookup - look up a powerdomain by name, return a pointer
231 * @name: name of powerdomain
232 *
233 * Find a registered powerdomain by its name @name. Returns a pointer
234 * to the struct powerdomain if found, or NULL otherwise.
235 */
236struct powerdomain *pwrdm_lookup(const char *name)
237{
238 struct powerdomain *pwrdm;
239
240 if (!name)
241 return NULL;
242
243 pwrdm = _pwrdm_lookup(name);
244
245 return pwrdm;
246}
247
248/**
249 * pwrdm_for_each - call function on each registered clockdomain
250 * @fn: callback function *
251 *
252 * Call the supplied function @fn for each registered powerdomain.
253 * The callback function @fn can return anything but 0 to bail out
254 * early from the iterator. Returns the last return value of the
255 * callback function, which should be 0 for success or anything else
256 * to indicate failure; or -EINVAL if the function pointer is null.
257 */
258int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
259 void *user)
260{
261 struct powerdomain *temp_pwrdm;
262 int ret = 0;
263
264 if (!fn)
265 return -EINVAL;
266
267 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
268 ret = (*fn)(temp_pwrdm, user);
269 if (ret)
270 break;
271 }
272
273 return ret;
274}
275
276/**
277 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
278 * @pwrdm: struct powerdomain * to add the clockdomain to
279 * @clkdm: struct clockdomain * to associate with a powerdomain
280 *
281 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
282 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
283 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
284 * or 0 upon success.
285 */
286int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
287{
288 int i;
289 int ret = -EINVAL;
290
291 if (!pwrdm || !clkdm)
292 return -EINVAL;
293
294 pr_debug("powerdomain: associating clockdomain %s with powerdomain "
295 "%s\n", clkdm->name, pwrdm->name);
296
297 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
298 if (!pwrdm->pwrdm_clkdms[i])
299 break;
300#ifdef DEBUG
301 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
302 ret = -EINVAL;
303 goto pac_exit;
304 }
305#endif
306 }
307
308 if (i == PWRDM_MAX_CLKDMS) {
309 pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
310 "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
311 WARN_ON(1);
312 ret = -ENOMEM;
313 goto pac_exit;
314 }
315
316 pwrdm->pwrdm_clkdms[i] = clkdm;
317
318 ret = 0;
319
320pac_exit:
321 return ret;
322}
323
324/**
325 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
326 * @pwrdm: struct powerdomain * to add the clockdomain to
327 * @clkdm: struct clockdomain * to associate with a powerdomain
328 *
329 * Dissociate the clockdomain @clkdm from the powerdomain
330 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
331 * if @clkdm was not associated with the powerdomain, or 0 upon
332 * success.
333 */
334int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
335{
336 int ret = -EINVAL;
337 int i;
338
339 if (!pwrdm || !clkdm)
340 return -EINVAL;
341
342 pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
343 "%s\n", clkdm->name, pwrdm->name);
344
345 for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
346 if (pwrdm->pwrdm_clkdms[i] == clkdm)
347 break;
348
349 if (i == PWRDM_MAX_CLKDMS) {
350 pr_debug("powerdomain: clkdm %s not associated with pwrdm "
351 "%s ?!\n", clkdm->name, pwrdm->name);
352 ret = -ENOENT;
353 goto pdc_exit;
354 }
355
356 pwrdm->pwrdm_clkdms[i] = NULL;
357
358 ret = 0;
359
360pdc_exit:
361 return ret;
362}
363
364/**
365 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
366 * @pwrdm: struct powerdomain * to iterate over
367 * @fn: callback function *
368 *
369 * Call the supplied function @fn for each clockdomain in the powerdomain
370 * @pwrdm. The callback function can return anything but 0 to bail
371 * out early from the iterator. Returns -EINVAL if presented with
372 * invalid pointers; or passes along the last return value of the
373 * callback function, which should be 0 for success or anything else
374 * to indicate failure.
375 */
376int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
377 int (*fn)(struct powerdomain *pwrdm,
378 struct clockdomain *clkdm))
379{
380 int ret = 0;
381 int i;
382
383 if (!fn)
384 return -EINVAL;
385
386 for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
387 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
388
389 return ret;
390}
391
392/**
393 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
394 * @pwrdm: struct powerdomain *
395 *
396 * Return the number of controllable memory banks in powerdomain @pwrdm,
397 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
398 */
399int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
400{
401 if (!pwrdm)
402 return -EINVAL;
403
404 return pwrdm->banks;
405}
406
407/**
408 * pwrdm_set_next_pwrst - set next powerdomain power state
409 * @pwrdm: struct powerdomain * to set
410 * @pwrst: one of the PWRDM_POWER_* macros
411 *
412 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
413 * may not enter this state immediately if the preconditions for this state
414 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
415 * null or if the power state is invalid for the powerdomin, or returns 0
416 * upon success.
417 */
418int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
419{
420 int ret = -EINVAL;
421
422 if (!pwrdm)
423 return -EINVAL;
424
425 if (!(pwrdm->pwrsts & (1 << pwrst)))
426 return -EINVAL;
427
428 pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
429 pwrdm->name, pwrst);
430
431 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
432 /* Trace the pwrdm desired target state */
433 trace_power_domain_target(pwrdm->name, pwrst,
434 smp_processor_id());
435 /* Program the pwrdm desired target state */
436 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
437 }
438
439 return ret;
440}
441
442/**
443 * pwrdm_read_next_pwrst - get next powerdomain power state
444 * @pwrdm: struct powerdomain * to get power state
445 *
446 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
447 * if the powerdomain pointer is null or returns the next power state
448 * upon success.
449 */
450int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
451{
452 int ret = -EINVAL;
453
454 if (!pwrdm)
455 return -EINVAL;
456
457 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
458 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
459
460 return ret;
461}
462
463/**
464 * pwrdm_read_pwrst - get current powerdomain power state
465 * @pwrdm: struct powerdomain * to get power state
466 *
467 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
468 * if the powerdomain pointer is null or returns the current power state
469 * upon success.
470 */
471int pwrdm_read_pwrst(struct powerdomain *pwrdm)
472{
473 int ret = -EINVAL;
474
475 if (!pwrdm)
476 return -EINVAL;
477
478 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
479 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
480
481 return ret;
482}
483
484/**
485 * pwrdm_read_prev_pwrst - get previous powerdomain power state
486 * @pwrdm: struct powerdomain * to get previous power state
487 *
488 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
489 * if the powerdomain pointer is null or returns the previous power state
490 * upon success.
491 */
492int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
493{
494 int ret = -EINVAL;
495
496 if (!pwrdm)
497 return -EINVAL;
498
499 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
500 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
501
502 return ret;
503}
504
505/**
506 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
507 * @pwrdm: struct powerdomain * to set
508 * @pwrst: one of the PWRDM_POWER_* macros
509 *
510 * Set the next power state @pwrst that the logic portion of the
511 * powerdomain @pwrdm will enter when the powerdomain enters retention.
512 * This will be either RETENTION or OFF, if supported. Returns
513 * -EINVAL if the powerdomain pointer is null or the target power
514 * state is not not supported, or returns 0 upon success.
515 */
516int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
517{
518 int ret = -EINVAL;
519
520 if (!pwrdm)
521 return -EINVAL;
522
523 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
524 return -EINVAL;
525
526 pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
527 pwrdm->name, pwrst);
528
529 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
530 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
531
532 return ret;
533}
534
535/**
536 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
537 * @pwrdm: struct powerdomain * to set
538 * @bank: memory bank number to set (0-3)
539 * @pwrst: one of the PWRDM_POWER_* macros
540 *
541 * Set the next power state @pwrst that memory bank @bank of the
542 * powerdomain @pwrdm will enter when the powerdomain enters the ON
543 * state. @bank will be a number from 0 to 3, and represents different
544 * types of memory, depending on the powerdomain. Returns -EINVAL if
545 * the powerdomain pointer is null or the target power state is not
546 * not supported for this memory bank, -EEXIST if the target memory
547 * bank does not exist or is not controllable, or returns 0 upon
548 * success.
549 */
550int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
551{
552 int ret = -EINVAL;
553
554 if (!pwrdm)
555 return -EINVAL;
556
557 if (pwrdm->banks < (bank + 1))
558 return -EEXIST;
559
560 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
561 return -EINVAL;
562
563 pr_debug("powerdomain: setting next memory powerstate for domain %s "
564 "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);
565
566 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
567 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
568
569 return ret;
570}
571
572/**
573 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
574 * @pwrdm: struct powerdomain * to set
575 * @bank: memory bank number to set (0-3)
576 * @pwrst: one of the PWRDM_POWER_* macros
577 *
578 * Set the next power state @pwrst that memory bank @bank of the
579 * powerdomain @pwrdm will enter when the powerdomain enters the
580 * RETENTION state. Bank will be a number from 0 to 3, and represents
581 * different types of memory, depending on the powerdomain. @pwrst
582 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
583 * the powerdomain pointer is null or the target power state is not
584 * not supported for this memory bank, -EEXIST if the target memory
585 * bank does not exist or is not controllable, or returns 0 upon
586 * success.
587 */
588int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
589{
590 int ret = -EINVAL;
591
592 if (!pwrdm)
593 return -EINVAL;
594
595 if (pwrdm->banks < (bank + 1))
596 return -EEXIST;
597
598 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
599 return -EINVAL;
600
601 pr_debug("powerdomain: setting next memory powerstate for domain %s "
602 "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);
603
604 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
605 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
606
607 return ret;
608}
609
610/**
611 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
612 * @pwrdm: struct powerdomain * to get current logic retention power state
613 *
614 * Return the power state that the logic portion of powerdomain @pwrdm
615 * will enter when the powerdomain enters retention. Returns -EINVAL
616 * if the powerdomain pointer is null or returns the logic retention
617 * power state upon success.
618 */
619int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
620{
621 int ret = -EINVAL;
622
623 if (!pwrdm)
624 return -EINVAL;
625
626 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
627 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
628
629 return ret;
630}
631
632/**
633 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
634 * @pwrdm: struct powerdomain * to get previous logic power state
635 *
636 * Return the powerdomain @pwrdm's previous logic power state. Returns
637 * -EINVAL if the powerdomain pointer is null or returns the previous
638 * logic power state upon success.
639 */
640int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
641{
642 int ret = -EINVAL;
643
644 if (!pwrdm)
645 return -EINVAL;
646
647 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
648 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
649
650 return ret;
651}
652
653/**
654 * pwrdm_read_logic_retst - get next powerdomain logic power state
655 * @pwrdm: struct powerdomain * to get next logic power state
656 *
657 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
658 * if the powerdomain pointer is null or returns the next logic
659 * power state upon success.
660 */
661int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
662{
663 int ret = -EINVAL;
664
665 if (!pwrdm)
666 return -EINVAL;
667
668 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
669 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
670
671 return ret;
672}
673
674/**
675 * pwrdm_read_mem_pwrst - get current memory bank power state
676 * @pwrdm: struct powerdomain * to get current memory bank power state
677 * @bank: memory bank number (0-3)
678 *
679 * Return the powerdomain @pwrdm's current memory power state for bank
680 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
681 * the target memory bank does not exist or is not controllable, or
682 * returns the current memory power state upon success.
683 */
684int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
685{
686 int ret = -EINVAL;
687
688 if (!pwrdm)
689 return ret;
690
691 if (pwrdm->banks < (bank + 1))
692 return ret;
693
694 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
695 bank = 1;
696
697 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
698 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
699
700 return ret;
701}
702
703/**
704 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
705 * @pwrdm: struct powerdomain * to get previous memory bank power state
706 * @bank: memory bank number (0-3)
707 *
708 * Return the powerdomain @pwrdm's previous memory power state for
709 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
710 * -EEXIST if the target memory bank does not exist or is not
711 * controllable, or returns the previous memory power state upon
712 * success.
713 */
714int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
715{
716 int ret = -EINVAL;
717
718 if (!pwrdm)
719 return ret;
720
721 if (pwrdm->banks < (bank + 1))
722 return ret;
723
724 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
725 bank = 1;
726
727 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
728 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
729
730 return ret;
731}
732
733/**
734 * pwrdm_read_mem_retst - get next memory bank power state
735 * @pwrdm: struct powerdomain * to get mext memory bank power state
736 * @bank: memory bank number (0-3)
737 *
738 * Return the powerdomain pwrdm's next memory power state for bank
739 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
740 * the target memory bank does not exist or is not controllable, or
741 * returns the next memory power state upon success.
742 */
743int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
744{
745 int ret = -EINVAL;
746
747 if (!pwrdm)
748 return ret;
749
750 if (pwrdm->banks < (bank + 1))
751 return ret;
752
753 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
754 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
755
756 return ret;
757}
758
759/**
760 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
761 * @pwrdm: struct powerdomain * to clear
762 *
763 * Clear the powerdomain's previous power state register @pwrdm.
764 * Clears the entire register, including logic and memory bank
765 * previous power states. Returns -EINVAL if the powerdomain pointer
766 * is null, or returns 0 upon success.
767 */
768int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
769{
770 int ret = -EINVAL;
771
772 if (!pwrdm)
773 return ret;
774
775 /*
776 * XXX should get the powerdomain's current state here;
777 * warn & fail if it is not ON.
778 */
779
780 pr_debug("powerdomain: clearing previous power state reg for %s\n",
781 pwrdm->name);
782
783 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
784 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
785
786 return ret;
787}
788
789/**
790 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
791 * @pwrdm: struct powerdomain *
792 *
793 * Enable automatic context save-and-restore upon power state change
794 * for some devices in the powerdomain @pwrdm. Warning: this only
795 * affects a subset of devices in a powerdomain; check the TRM
796 * closely. Returns -EINVAL if the powerdomain pointer is null or if
797 * the powerdomain does not support automatic save-and-restore, or
798 * returns 0 upon success.
799 */
800int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
801{
802 int ret = -EINVAL;
803
804 if (!pwrdm)
805 return ret;
806
807 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
808 return ret;
809
810 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
811 pwrdm->name);
812
813 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
814 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
815
816 return ret;
817}
818
819/**
820 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
821 * @pwrdm: struct powerdomain *
822 *
823 * Disable automatic context save-and-restore upon power state change
824 * for some devices in the powerdomain @pwrdm. Warning: this only
825 * affects a subset of devices in a powerdomain; check the TRM
826 * closely. Returns -EINVAL if the powerdomain pointer is null or if
827 * the powerdomain does not support automatic save-and-restore, or
828 * returns 0 upon success.
829 */
830int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
831{
832 int ret = -EINVAL;
833
834 if (!pwrdm)
835 return ret;
836
837 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
838 return ret;
839
840 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
841 pwrdm->name);
842
843 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
844 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
845
846 return ret;
847}
848
849/**
850 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
851 * @pwrdm: struct powerdomain *
852 *
853 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
854 * for some devices, or 0 if it does not.
855 */
856bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
857{
858 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
859}
860
861/**
862 * pwrdm_set_lowpwrstchange - Request a low power state change
863 * @pwrdm: struct powerdomain *
864 *
865 * Allows a powerdomain to transtion to a lower power sleep state
866 * from an existing sleep state without waking up the powerdomain.
867 * Returns -EINVAL if the powerdomain pointer is null or if the
868 * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
869 * upon success.
870 */
871int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
872{
873 int ret = -EINVAL;
874
875 if (!pwrdm)
876 return -EINVAL;
877
878 if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
879 return -EINVAL;
880
881 pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
882 pwrdm->name);
883
884 if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange)
885 ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
886
887 return ret;
888}
889
890/**
891 * pwrdm_wait_transition - wait for powerdomain power transition to finish
892 * @pwrdm: struct powerdomain * to wait for
893 *
894 * If the powerdomain @pwrdm is in the process of a state transition,
895 * spin until it completes the power transition, or until an iteration
896 * bailout value is reached. Returns -EINVAL if the powerdomain
897 * pointer is null, -EAGAIN if the bailout value was reached, or
898 * returns 0 upon success.
899 */
900int pwrdm_wait_transition(struct powerdomain *pwrdm)
901{
902 int ret = -EINVAL;
903
904 if (!pwrdm)
905 return -EINVAL;
906
907 if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
908 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
909
910 return ret;
911}
912
913int pwrdm_state_switch(struct powerdomain *pwrdm)
914{
915 return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
916}
917
918int pwrdm_clkdm_state_switch(struct clockdomain *clkdm)
919{
920 if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) {
921 pwrdm_wait_transition(clkdm->pwrdm.ptr);
922 return pwrdm_state_switch(clkdm->pwrdm.ptr);
923 }
924
925 return -EINVAL;
926}
927
928int pwrdm_pre_transition(void)
929{
930 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
931 return 0;
932}
933
934int pwrdm_post_transition(void)
935{
936 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
937 return 0;
938}
939
940/**
941 * pwrdm_get_context_loss_count - get powerdomain's context loss count
942 * @pwrdm: struct powerdomain * to wait for
943 *
944 * Context loss count is the sum of powerdomain off-mode counter, the
945 * logic off counter and the per-bank memory off counter. Returns 0
946 * (and WARNs) upon error, otherwise, returns the context loss count.
947 */
948u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
949{
950 int i, count;
951
952 if (!pwrdm) {
953 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
954 return 0;
955 }
956
957 count = pwrdm->state_counter[PWRDM_POWER_OFF];
958 count += pwrdm->ret_logic_off_counter;
959
960 for (i = 0; i < pwrdm->banks; i++)
961 count += pwrdm->ret_mem_off_counter[i];
962
963 pr_debug("powerdomain: %s: context loss count = %u\n",
964 pwrdm->name, count);
965
966 return count;
967}
968
969/**
970 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
971 * @pwrdm: struct powerdomain *
972 *
973 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
974 * can lose either memory or logic context or if @pwrdm is invalid, or
975 * returns 0 otherwise. This function is not concerned with how the
976 * powerdomain registers are programmed (i.e., to go off or not); it's
977 * concerned with whether it's ever possible for this powerdomain to
978 * go off while some other part of the chip is active. This function
979 * assumes that every powerdomain can go to either ON or INACTIVE.
980 */
981bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
982{
983 int i;
984
985 if (IS_ERR_OR_NULL(pwrdm)) {
986 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
987 __func__);
988 return 1;
989 }
990
991 if (pwrdm->pwrsts & PWRSTS_OFF)
992 return 1;
993
994 if (pwrdm->pwrsts & PWRSTS_RET) {
995 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
996 return 1;
997
998 for (i = 0; i < pwrdm->banks; i++)
999 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1000 return 1;
1001 }
1002
1003 for (i = 0; i < pwrdm->banks; i++)
1004 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
1005 return 1;
1006
1007 return 0;
1008}