1 /*
2 * OMAP powerdomain control
3 *
4 * Copyright (C) 2007-2008, 2011 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 <linux/spinlock.h>
23 #include <trace/events/power.h>
24
25 #include "cm2xxx_3xxx.h"
26 #include "prcm44xx.h"
27 #include "cm44xx.h"
28 #include "prm2xxx_3xxx.h"
29 #include "prm44xx.h"
30
31 #include <asm/cpu.h>
32
33 #include "powerdomain.h"
34 #include "clockdomain.h"
35 #include "voltage.h"
36
37 #include "soc.h"
38 #include "pm.h"
39
40 #define PWRDM_TRACE_STATES_FLAG (1<<31)
41
42 enum {
43 PWRDM_STATE_NOW = 0,
44 PWRDM_STATE_PREV,
45 };
46
47 /*
48 * Types of sleep_switch used internally in omap_set_pwrdm_state()
49 * and its associated static functions
50 *
51 * XXX Better documentation is needed here
52 */
53 #define ALREADYACTIVE_SWITCH 0
54 #define FORCEWAKEUP_SWITCH 1
55 #define LOWPOWERSTATE_SWITCH 2
56
57 /* pwrdm_list contains all registered struct powerdomains */
58 static LIST_HEAD(pwrdm_list);
59
60 static struct pwrdm_ops *arch_pwrdm;
61
62 /* Private functions */
63
_pwrdm_lookup(const char * name)64 static struct powerdomain *_pwrdm_lookup(const char *name)
65 {
66 struct powerdomain *pwrdm, *temp_pwrdm;
67
68 pwrdm = NULL;
69
70 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
71 if (!strcmp(name, temp_pwrdm->name)) {
72 pwrdm = temp_pwrdm;
73 break;
74 }
75 }
76
77 return pwrdm;
78 }
79
80 /**
81 * _pwrdm_register - register a powerdomain
82 * @pwrdm: struct powerdomain * to register
83 *
84 * Adds a powerdomain to the internal powerdomain list. Returns
85 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
86 * already registered by the provided name, or 0 upon success.
87 */
_pwrdm_register(struct powerdomain * pwrdm)88 static int _pwrdm_register(struct powerdomain *pwrdm)
89 {
90 int i;
91 struct voltagedomain *voltdm;
92
93 if (!pwrdm || !pwrdm->name)
94 return -EINVAL;
95
96 if (cpu_is_omap44xx() &&
97 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
98 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
99 pwrdm->name);
100 return -EINVAL;
101 }
102
103 if (_pwrdm_lookup(pwrdm->name))
104 return -EEXIST;
105
106 if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
107 if (!arch_pwrdm->pwrdm_has_voltdm())
108 goto skip_voltdm;
109
110 voltdm = voltdm_lookup(pwrdm->voltdm.name);
111 if (!voltdm) {
112 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
113 pwrdm->name, pwrdm->voltdm.name);
114 return -EINVAL;
115 }
116 pwrdm->voltdm.ptr = voltdm;
117 INIT_LIST_HEAD(&pwrdm->voltdm_node);
118 voltdm_add_pwrdm(voltdm, pwrdm);
119 skip_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
_update_logic_membank_counters(struct powerdomain * pwrdm)142 static 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
_pwrdm_state_switch(struct powerdomain * pwrdm,int flag)161 static 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 (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, trace_state,
191 smp_processor_id());
192 }
193 break;
194 default:
195 return -EINVAL;
196 }
197
198 if (state != prev)
199 pwrdm->state_counter[state]++;
200
201 pm_dbg_update_time(pwrdm, prev);
202
203 pwrdm->state = state;
204
205 return 0;
206 }
207
_pwrdm_pre_transition_cb(struct powerdomain * pwrdm,void * unused)208 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
209 {
210 pwrdm_clear_all_prev_pwrst(pwrdm);
211 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
212 return 0;
213 }
214
_pwrdm_post_transition_cb(struct powerdomain * pwrdm,void * unused)215 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
216 {
217 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
218 return 0;
219 }
220
221 /**
222 * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
223 * @pwrdm: struct powerdomain * to operate on
224 * @curr_pwrst: current power state of @pwrdm
225 * @pwrst: power state to switch to
226 * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised
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 */
_pwrdm_save_clkdm_state_and_activate(struct powerdomain * pwrdm,u8 curr_pwrst,u8 pwrst,bool * hwsup)236 static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
237 u8 curr_pwrst, u8 pwrst,
238 bool *hwsup)
239 {
240 u8 sleep_switch;
241
242 if (curr_pwrst < PWRDM_POWER_ON) {
243 if (curr_pwrst > pwrst &&
244 pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
245 arch_pwrdm->pwrdm_set_lowpwrstchange) {
246 sleep_switch = LOWPOWERSTATE_SWITCH;
247 } else {
248 *hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
249 clkdm_wakeup_nolock(pwrdm->pwrdm_clkdms[0]);
250 sleep_switch = FORCEWAKEUP_SWITCH;
251 }
252 } else {
253 sleep_switch = ALREADYACTIVE_SWITCH;
254 }
255
256 return sleep_switch;
257 }
258
259 /**
260 * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
261 * @pwrdm: struct powerdomain * to operate on
262 * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
263 * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode?
264 *
265 * Restore the clockdomain state perturbed by
266 * _pwrdm_save_clkdm_state_and_activate(), and call the power state
267 * bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if
268 * the powerdomain contains multiple clockdomains, this assumes that
269 * the first associated clockdomain supports either
270 * hardware-supervised idle control in the register, or
271 * software-supervised sleep. No return value.
272 */
_pwrdm_restore_clkdm_state(struct powerdomain * pwrdm,u8 sleep_switch,bool hwsup)273 static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
274 u8 sleep_switch, bool hwsup)
275 {
276 switch (sleep_switch) {
277 case FORCEWAKEUP_SWITCH:
278 if (hwsup)
279 clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
280 else
281 clkdm_sleep_nolock(pwrdm->pwrdm_clkdms[0]);
282 break;
283 case LOWPOWERSTATE_SWITCH:
284 if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
285 arch_pwrdm->pwrdm_set_lowpwrstchange)
286 arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
287 pwrdm_state_switch_nolock(pwrdm);
288 break;
289 }
290 }
291
292 /* Public functions */
293
294 /**
295 * pwrdm_register_platform_funcs - register powerdomain implementation fns
296 * @po: func pointers for arch specific implementations
297 *
298 * Register the list of function pointers used to implement the
299 * powerdomain functions on different OMAP SoCs. Should be called
300 * before any other pwrdm_register*() function. Returns -EINVAL if
301 * @po is null, -EEXIST if platform functions have already been
302 * registered, or 0 upon success.
303 */
pwrdm_register_platform_funcs(struct pwrdm_ops * po)304 int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
305 {
306 if (!po)
307 return -EINVAL;
308
309 if (arch_pwrdm)
310 return -EEXIST;
311
312 arch_pwrdm = po;
313
314 return 0;
315 }
316
317 /**
318 * pwrdm_register_pwrdms - register SoC powerdomains
319 * @ps: pointer to an array of struct powerdomain to register
320 *
321 * Register the powerdomains available on a particular OMAP SoC. Must
322 * be called after pwrdm_register_platform_funcs(). May be called
323 * multiple times. Returns -EACCES if called before
324 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
325 * null; or 0 upon success.
326 */
pwrdm_register_pwrdms(struct powerdomain ** ps)327 int pwrdm_register_pwrdms(struct powerdomain **ps)
328 {
329 struct powerdomain **p = NULL;
330
331 if (!arch_pwrdm)
332 return -EEXIST;
333
334 if (!ps)
335 return -EINVAL;
336
337 for (p = ps; *p; p++)
338 _pwrdm_register(*p);
339
340 return 0;
341 }
342
343 /**
344 * pwrdm_complete_init - set up the powerdomain layer
345 *
346 * Do whatever is necessary to initialize registered powerdomains and
347 * powerdomain code. Currently, this programs the next power state
348 * for each powerdomain to ON. This prevents powerdomains from
349 * unexpectedly losing context or entering high wakeup latency modes
350 * with non-power-management-enabled kernels. Must be called after
351 * pwrdm_register_pwrdms(). Returns -EACCES if called before
352 * pwrdm_register_pwrdms(), or 0 upon success.
353 */
pwrdm_complete_init(void)354 int pwrdm_complete_init(void)
355 {
356 struct powerdomain *temp_p;
357
358 if (list_empty(&pwrdm_list))
359 return -EACCES;
360
361 list_for_each_entry(temp_p, &pwrdm_list, node)
362 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
363
364 return 0;
365 }
366
367 /**
368 * pwrdm_lock - acquire a Linux spinlock on a powerdomain
369 * @pwrdm: struct powerdomain * to lock
370 *
371 * Acquire the powerdomain spinlock on @pwrdm. No return value.
372 */
pwrdm_lock(struct powerdomain * pwrdm)373 void pwrdm_lock(struct powerdomain *pwrdm)
374 __acquires(&pwrdm->_lock)
375 {
376 spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
377 }
378
379 /**
380 * pwrdm_unlock - release a Linux spinlock on a powerdomain
381 * @pwrdm: struct powerdomain * to unlock
382 *
383 * Release the powerdomain spinlock on @pwrdm. No return value.
384 */
pwrdm_unlock(struct powerdomain * pwrdm)385 void pwrdm_unlock(struct powerdomain *pwrdm)
386 __releases(&pwrdm->_lock)
387 {
388 spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
389 }
390
391 /**
392 * pwrdm_lookup - look up a powerdomain by name, return a pointer
393 * @name: name of powerdomain
394 *
395 * Find a registered powerdomain by its name @name. Returns a pointer
396 * to the struct powerdomain if found, or NULL otherwise.
397 */
pwrdm_lookup(const char * name)398 struct powerdomain *pwrdm_lookup(const char *name)
399 {
400 struct powerdomain *pwrdm;
401
402 if (!name)
403 return NULL;
404
405 pwrdm = _pwrdm_lookup(name);
406
407 return pwrdm;
408 }
409
410 /**
411 * pwrdm_for_each - call function on each registered clockdomain
412 * @fn: callback function *
413 *
414 * Call the supplied function @fn for each registered powerdomain.
415 * The callback function @fn can return anything but 0 to bail out
416 * early from the iterator. Returns the last return value of the
417 * callback function, which should be 0 for success or anything else
418 * to indicate failure; or -EINVAL if the function pointer is null.
419 */
pwrdm_for_each(int (* fn)(struct powerdomain * pwrdm,void * user),void * user)420 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
421 void *user)
422 {
423 struct powerdomain *temp_pwrdm;
424 int ret = 0;
425
426 if (!fn)
427 return -EINVAL;
428
429 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
430 ret = (*fn)(temp_pwrdm, user);
431 if (ret)
432 break;
433 }
434
435 return ret;
436 }
437
438 /**
439 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
440 * @pwrdm: struct powerdomain * to add the clockdomain to
441 * @clkdm: struct clockdomain * to associate with a powerdomain
442 *
443 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
444 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
445 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
446 * or 0 upon success.
447 */
pwrdm_add_clkdm(struct powerdomain * pwrdm,struct clockdomain * clkdm)448 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
449 {
450 int i;
451 int ret = -EINVAL;
452
453 if (!pwrdm || !clkdm)
454 return -EINVAL;
455
456 pr_debug("powerdomain: %s: associating clockdomain %s\n",
457 pwrdm->name, clkdm->name);
458
459 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
460 if (!pwrdm->pwrdm_clkdms[i])
461 break;
462 #ifdef DEBUG
463 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
464 ret = -EINVAL;
465 goto pac_exit;
466 }
467 #endif
468 }
469
470 if (i == PWRDM_MAX_CLKDMS) {
471 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
472 pwrdm->name, clkdm->name);
473 WARN_ON(1);
474 ret = -ENOMEM;
475 goto pac_exit;
476 }
477
478 pwrdm->pwrdm_clkdms[i] = clkdm;
479
480 ret = 0;
481
482 pac_exit:
483 return ret;
484 }
485
486 /**
487 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
488 * @pwrdm: struct powerdomain * to add the clockdomain to
489 * @clkdm: struct clockdomain * to associate with a powerdomain
490 *
491 * Dissociate the clockdomain @clkdm from the powerdomain
492 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
493 * if @clkdm was not associated with the powerdomain, or 0 upon
494 * success.
495 */
pwrdm_del_clkdm(struct powerdomain * pwrdm,struct clockdomain * clkdm)496 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
497 {
498 int ret = -EINVAL;
499 int i;
500
501 if (!pwrdm || !clkdm)
502 return -EINVAL;
503
504 pr_debug("powerdomain: %s: dissociating clockdomain %s\n",
505 pwrdm->name, clkdm->name);
506
507 for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
508 if (pwrdm->pwrdm_clkdms[i] == clkdm)
509 break;
510
511 if (i == PWRDM_MAX_CLKDMS) {
512 pr_debug("powerdomain: %s: clkdm %s not associated?!\n",
513 pwrdm->name, clkdm->name);
514 ret = -ENOENT;
515 goto pdc_exit;
516 }
517
518 pwrdm->pwrdm_clkdms[i] = NULL;
519
520 ret = 0;
521
522 pdc_exit:
523 return ret;
524 }
525
526 /**
527 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
528 * @pwrdm: struct powerdomain * to iterate over
529 * @fn: callback function *
530 *
531 * Call the supplied function @fn for each clockdomain in the powerdomain
532 * @pwrdm. The callback function can return anything but 0 to bail
533 * out early from the iterator. Returns -EINVAL if presented with
534 * invalid pointers; or passes along the last return value of the
535 * callback function, which should be 0 for success or anything else
536 * to indicate failure.
537 */
pwrdm_for_each_clkdm(struct powerdomain * pwrdm,int (* fn)(struct powerdomain * pwrdm,struct clockdomain * clkdm))538 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
539 int (*fn)(struct powerdomain *pwrdm,
540 struct clockdomain *clkdm))
541 {
542 int ret = 0;
543 int i;
544
545 if (!fn)
546 return -EINVAL;
547
548 for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
549 if (pwrdm->pwrdm_clkdms[i])
550 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
551
552 return ret;
553 }
554
555 /**
556 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in
557 * @pwrdm: struct powerdomain *
558 *
559 * Return a pointer to the struct voltageomain that the specified powerdomain
560 * @pwrdm exists in.
561 */
pwrdm_get_voltdm(struct powerdomain * pwrdm)562 struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm)
563 {
564 return pwrdm->voltdm.ptr;
565 }
566
567 /**
568 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
569 * @pwrdm: struct powerdomain *
570 *
571 * Return the number of controllable memory banks in powerdomain @pwrdm,
572 * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
573 */
pwrdm_get_mem_bank_count(struct powerdomain * pwrdm)574 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
575 {
576 if (!pwrdm)
577 return -EINVAL;
578
579 return pwrdm->banks;
580 }
581
582 /**
583 * pwrdm_set_next_pwrst - set next powerdomain power state
584 * @pwrdm: struct powerdomain * to set
585 * @pwrst: one of the PWRDM_POWER_* macros
586 *
587 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
588 * may not enter this state immediately if the preconditions for this state
589 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
590 * null or if the power state is invalid for the powerdomin, or returns 0
591 * upon success.
592 */
pwrdm_set_next_pwrst(struct powerdomain * pwrdm,u8 pwrst)593 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
594 {
595 int ret = -EINVAL;
596
597 if (!pwrdm)
598 return -EINVAL;
599
600 if (!(pwrdm->pwrsts & (1 << pwrst)))
601 return -EINVAL;
602
603 pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
604 pwrdm->name, pwrst);
605
606 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
607 /* Trace the pwrdm desired target state */
608 trace_power_domain_target(pwrdm->name, pwrst,
609 smp_processor_id());
610 /* Program the pwrdm desired target state */
611 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
612 }
613
614 return ret;
615 }
616
617 /**
618 * pwrdm_read_next_pwrst - get next powerdomain power state
619 * @pwrdm: struct powerdomain * to get power state
620 *
621 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL
622 * if the powerdomain pointer is null or returns the next power state
623 * upon success.
624 */
pwrdm_read_next_pwrst(struct powerdomain * pwrdm)625 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
626 {
627 int ret = -EINVAL;
628
629 if (!pwrdm)
630 return -EINVAL;
631
632 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
633 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
634
635 return ret;
636 }
637
638 /**
639 * pwrdm_read_pwrst - get current powerdomain power state
640 * @pwrdm: struct powerdomain * to get power state
641 *
642 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
643 * if the powerdomain pointer is null or returns the current power state
644 * upon success. Note that if the power domain only supports the ON state
645 * then just return ON as the current state.
646 */
pwrdm_read_pwrst(struct powerdomain * pwrdm)647 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
648 {
649 int ret = -EINVAL;
650
651 if (!pwrdm)
652 return -EINVAL;
653
654 if (pwrdm->pwrsts == PWRSTS_ON)
655 return PWRDM_POWER_ON;
656
657 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
658 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
659
660 return ret;
661 }
662
663 /**
664 * pwrdm_read_prev_pwrst - get previous powerdomain power state
665 * @pwrdm: struct powerdomain * to get previous power state
666 *
667 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
668 * if the powerdomain pointer is null or returns the previous power state
669 * upon success.
670 */
pwrdm_read_prev_pwrst(struct powerdomain * pwrdm)671 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
672 {
673 int ret = -EINVAL;
674
675 if (!pwrdm)
676 return -EINVAL;
677
678 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
679 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
680
681 return ret;
682 }
683
684 /**
685 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
686 * @pwrdm: struct powerdomain * to set
687 * @pwrst: one of the PWRDM_POWER_* macros
688 *
689 * Set the next power state @pwrst that the logic portion of the
690 * powerdomain @pwrdm will enter when the powerdomain enters retention.
691 * This will be either RETENTION or OFF, if supported. Returns
692 * -EINVAL if the powerdomain pointer is null or the target power
693 * state is not not supported, or returns 0 upon success.
694 */
pwrdm_set_logic_retst(struct powerdomain * pwrdm,u8 pwrst)695 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
696 {
697 int ret = -EINVAL;
698
699 if (!pwrdm)
700 return -EINVAL;
701
702 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
703 return -EINVAL;
704
705 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
706 pwrdm->name, pwrst);
707
708 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
709 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
710
711 return ret;
712 }
713
714 /**
715 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
716 * @pwrdm: struct powerdomain * to set
717 * @bank: memory bank number to set (0-3)
718 * @pwrst: one of the PWRDM_POWER_* macros
719 *
720 * Set the next power state @pwrst that memory bank @bank of the
721 * powerdomain @pwrdm will enter when the powerdomain enters the ON
722 * state. @bank will be a number from 0 to 3, and represents different
723 * types of memory, depending on the powerdomain. Returns -EINVAL if
724 * the powerdomain pointer is null or the target power state is not
725 * not supported for this memory bank, -EEXIST if the target memory
726 * bank does not exist or is not controllable, or returns 0 upon
727 * success.
728 */
pwrdm_set_mem_onst(struct powerdomain * pwrdm,u8 bank,u8 pwrst)729 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
730 {
731 int ret = -EINVAL;
732
733 if (!pwrdm)
734 return -EINVAL;
735
736 if (pwrdm->banks < (bank + 1))
737 return -EEXIST;
738
739 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
740 return -EINVAL;
741
742 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
743 pwrdm->name, bank, pwrst);
744
745 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
746 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
747
748 return ret;
749 }
750
751 /**
752 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
753 * @pwrdm: struct powerdomain * to set
754 * @bank: memory bank number to set (0-3)
755 * @pwrst: one of the PWRDM_POWER_* macros
756 *
757 * Set the next power state @pwrst that memory bank @bank of the
758 * powerdomain @pwrdm will enter when the powerdomain enters the
759 * RETENTION state. Bank will be a number from 0 to 3, and represents
760 * different types of memory, depending on the powerdomain. @pwrst
761 * will be either RETENTION or OFF, if supported. Returns -EINVAL if
762 * the powerdomain pointer is null or the target power state is not
763 * not supported for this memory bank, -EEXIST if the target memory
764 * bank does not exist or is not controllable, or returns 0 upon
765 * success.
766 */
pwrdm_set_mem_retst(struct powerdomain * pwrdm,u8 bank,u8 pwrst)767 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
768 {
769 int ret = -EINVAL;
770
771 if (!pwrdm)
772 return -EINVAL;
773
774 if (pwrdm->banks < (bank + 1))
775 return -EEXIST;
776
777 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
778 return -EINVAL;
779
780 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
781 pwrdm->name, bank, pwrst);
782
783 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
784 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
785
786 return ret;
787 }
788
789 /**
790 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
791 * @pwrdm: struct powerdomain * to get current logic retention power state
792 *
793 * Return the power state that the logic portion of powerdomain @pwrdm
794 * will enter when the powerdomain enters retention. Returns -EINVAL
795 * if the powerdomain pointer is null or returns the logic retention
796 * power state upon success.
797 */
pwrdm_read_logic_pwrst(struct powerdomain * pwrdm)798 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
799 {
800 int ret = -EINVAL;
801
802 if (!pwrdm)
803 return -EINVAL;
804
805 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
806 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
807
808 return ret;
809 }
810
811 /**
812 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
813 * @pwrdm: struct powerdomain * to get previous logic power state
814 *
815 * Return the powerdomain @pwrdm's previous logic power state. Returns
816 * -EINVAL if the powerdomain pointer is null or returns the previous
817 * logic power state upon success.
818 */
pwrdm_read_prev_logic_pwrst(struct powerdomain * pwrdm)819 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
820 {
821 int ret = -EINVAL;
822
823 if (!pwrdm)
824 return -EINVAL;
825
826 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
827 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
828
829 return ret;
830 }
831
832 /**
833 * pwrdm_read_logic_retst - get next powerdomain logic power state
834 * @pwrdm: struct powerdomain * to get next logic power state
835 *
836 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
837 * if the powerdomain pointer is null or returns the next logic
838 * power state upon success.
839 */
pwrdm_read_logic_retst(struct powerdomain * pwrdm)840 int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
841 {
842 int ret = -EINVAL;
843
844 if (!pwrdm)
845 return -EINVAL;
846
847 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
848 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
849
850 return ret;
851 }
852
853 /**
854 * pwrdm_read_mem_pwrst - get current memory bank power state
855 * @pwrdm: struct powerdomain * to get current memory bank power state
856 * @bank: memory bank number (0-3)
857 *
858 * Return the powerdomain @pwrdm's current memory power state for bank
859 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
860 * the target memory bank does not exist or is not controllable, or
861 * returns the current memory power state upon success.
862 */
pwrdm_read_mem_pwrst(struct powerdomain * pwrdm,u8 bank)863 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
864 {
865 int ret = -EINVAL;
866
867 if (!pwrdm)
868 return ret;
869
870 if (pwrdm->banks < (bank + 1))
871 return ret;
872
873 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
874 bank = 1;
875
876 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
877 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
878
879 return ret;
880 }
881
882 /**
883 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
884 * @pwrdm: struct powerdomain * to get previous memory bank power state
885 * @bank: memory bank number (0-3)
886 *
887 * Return the powerdomain @pwrdm's previous memory power state for
888 * bank @bank. Returns -EINVAL if the powerdomain pointer is null,
889 * -EEXIST if the target memory bank does not exist or is not
890 * controllable, or returns the previous memory power state upon
891 * success.
892 */
pwrdm_read_prev_mem_pwrst(struct powerdomain * pwrdm,u8 bank)893 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
894 {
895 int ret = -EINVAL;
896
897 if (!pwrdm)
898 return ret;
899
900 if (pwrdm->banks < (bank + 1))
901 return ret;
902
903 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
904 bank = 1;
905
906 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
907 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
908
909 return ret;
910 }
911
912 /**
913 * pwrdm_read_mem_retst - get next memory bank power state
914 * @pwrdm: struct powerdomain * to get mext memory bank power state
915 * @bank: memory bank number (0-3)
916 *
917 * Return the powerdomain pwrdm's next memory power state for bank
918 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
919 * the target memory bank does not exist or is not controllable, or
920 * returns the next memory power state upon success.
921 */
pwrdm_read_mem_retst(struct powerdomain * pwrdm,u8 bank)922 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
923 {
924 int ret = -EINVAL;
925
926 if (!pwrdm)
927 return ret;
928
929 if (pwrdm->banks < (bank + 1))
930 return ret;
931
932 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
933 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
934
935 return ret;
936 }
937
938 /**
939 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
940 * @pwrdm: struct powerdomain * to clear
941 *
942 * Clear the powerdomain's previous power state register @pwrdm.
943 * Clears the entire register, including logic and memory bank
944 * previous power states. Returns -EINVAL if the powerdomain pointer
945 * is null, or returns 0 upon success.
946 */
pwrdm_clear_all_prev_pwrst(struct powerdomain * pwrdm)947 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
948 {
949 int ret = -EINVAL;
950
951 if (!pwrdm)
952 return ret;
953
954 /*
955 * XXX should get the powerdomain's current state here;
956 * warn & fail if it is not ON.
957 */
958
959 pr_debug("powerdomain: %s: clearing previous power state reg\n",
960 pwrdm->name);
961
962 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
963 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
964
965 return ret;
966 }
967
968 /**
969 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
970 * @pwrdm: struct powerdomain *
971 *
972 * Enable automatic context save-and-restore upon power state change
973 * for some devices in the powerdomain @pwrdm. Warning: this only
974 * affects a subset of devices in a powerdomain; check the TRM
975 * closely. Returns -EINVAL if the powerdomain pointer is null or if
976 * the powerdomain does not support automatic save-and-restore, or
977 * returns 0 upon success.
978 */
pwrdm_enable_hdwr_sar(struct powerdomain * pwrdm)979 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
980 {
981 int ret = -EINVAL;
982
983 if (!pwrdm)
984 return ret;
985
986 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
987 return ret;
988
989 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
990
991 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
992 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
993
994 return ret;
995 }
996
997 /**
998 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
999 * @pwrdm: struct powerdomain *
1000 *
1001 * Disable automatic context save-and-restore upon power state change
1002 * for some devices in the powerdomain @pwrdm. Warning: this only
1003 * affects a subset of devices in a powerdomain; check the TRM
1004 * closely. Returns -EINVAL if the powerdomain pointer is null or if
1005 * the powerdomain does not support automatic save-and-restore, or
1006 * returns 0 upon success.
1007 */
pwrdm_disable_hdwr_sar(struct powerdomain * pwrdm)1008 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
1009 {
1010 int ret = -EINVAL;
1011
1012 if (!pwrdm)
1013 return ret;
1014
1015 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1016 return ret;
1017
1018 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
1019
1020 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
1021 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
1022
1023 return ret;
1024 }
1025
1026 /**
1027 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1028 * @pwrdm: struct powerdomain *
1029 *
1030 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
1031 * for some devices, or 0 if it does not.
1032 */
pwrdm_has_hdwr_sar(struct powerdomain * pwrdm)1033 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
1034 {
1035 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
1036 }
1037
pwrdm_state_switch_nolock(struct powerdomain * pwrdm)1038 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
1039 {
1040 int ret;
1041
1042 if (!pwrdm || !arch_pwrdm)
1043 return -EINVAL;
1044
1045 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
1046 if (!ret)
1047 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
1048
1049 return ret;
1050 }
1051
pwrdm_state_switch(struct powerdomain * pwrdm)1052 int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
1053 {
1054 int ret;
1055
1056 pwrdm_lock(pwrdm);
1057 ret = pwrdm_state_switch_nolock(pwrdm);
1058 pwrdm_unlock(pwrdm);
1059
1060 return ret;
1061 }
1062
pwrdm_pre_transition(struct powerdomain * pwrdm)1063 int pwrdm_pre_transition(struct powerdomain *pwrdm)
1064 {
1065 if (pwrdm)
1066 _pwrdm_pre_transition_cb(pwrdm, NULL);
1067 else
1068 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
1069
1070 return 0;
1071 }
1072
pwrdm_post_transition(struct powerdomain * pwrdm)1073 int pwrdm_post_transition(struct powerdomain *pwrdm)
1074 {
1075 if (pwrdm)
1076 _pwrdm_post_transition_cb(pwrdm, NULL);
1077 else
1078 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
1079
1080 return 0;
1081 }
1082
1083 /**
1084 * pwrdm_get_valid_lp_state() - Find best match deep power state
1085 * @pwrdm: power domain for which we want to find best match
1086 * @is_logic_state: Are we looking for logic state match here? Should
1087 * be one of PWRDM_xxx macro values
1088 * @req_state: requested power state
1089 *
1090 * Returns: closest match for requested power state. default fallback
1091 * is RET for logic state and ON for power state.
1092 *
1093 * This does a search from the power domain data looking for the
1094 * closest valid power domain state that the hardware can achieve.
1095 * PRCM definitions for PWRSTCTRL allows us to program whatever
1096 * configuration we'd like, and PRCM will actually attempt such
1097 * a transition, however if the powerdomain does not actually support it,
1098 * we endup with a hung system. The valid power domain states are already
1099 * available in our powerdomain data files. So this function tries to do
1100 * the following:
1101 * a) find if we have an exact match to the request - no issues.
1102 * b) else find if a deeper power state is possible.
1103 * c) failing which, it tries to find closest higher power state for the
1104 * request.
1105 */
pwrdm_get_valid_lp_state(struct powerdomain * pwrdm,bool is_logic_state,u8 req_state)1106 u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
1107 bool is_logic_state, u8 req_state)
1108 {
1109 u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
1110 pwrdm->pwrsts;
1111 /* For logic, ret is highest and others, ON is highest */
1112 u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
1113 u8 new_pwrst;
1114 bool found;
1115
1116 /* If it is already supported, nothing to search */
1117 if (pwrdm_states & BIT(req_state))
1118 return req_state;
1119
1120 if (!req_state)
1121 goto up_search;
1122
1123 /*
1124 * So, we dont have a exact match
1125 * Can we get a deeper power state match?
1126 */
1127 new_pwrst = req_state - 1;
1128 found = true;
1129 while (!(pwrdm_states & BIT(new_pwrst))) {
1130 /* No match even at OFF? Not available */
1131 if (new_pwrst == PWRDM_POWER_OFF) {
1132 found = false;
1133 break;
1134 }
1135 new_pwrst--;
1136 }
1137
1138 if (found)
1139 goto done;
1140
1141 up_search:
1142 /* OK, no deeper ones, can we get a higher match? */
1143 new_pwrst = req_state + 1;
1144 while (!(pwrdm_states & BIT(new_pwrst))) {
1145 if (new_pwrst > PWRDM_POWER_ON) {
1146 WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
1147 pwrdm->name);
1148 return PWRDM_POWER_ON;
1149 }
1150
1151 if (new_pwrst == default_pwrst)
1152 break;
1153 new_pwrst++;
1154 }
1155 done:
1156 return new_pwrst;
1157 }
1158
1159 /**
1160 * omap_set_pwrdm_state - change a powerdomain's current power state
1161 * @pwrdm: struct powerdomain * to change the power state of
1162 * @pwrst: power state to change to
1163 *
1164 * Change the current hardware power state of the powerdomain
1165 * represented by @pwrdm to the power state represented by @pwrst.
1166 * Returns -EINVAL if @pwrdm is null or invalid or if the
1167 * powerdomain's current power state could not be read, or returns 0
1168 * upon success or if @pwrdm does not support @pwrst or any
1169 * lower-power state. XXX Should not return 0 if the @pwrdm does not
1170 * support @pwrst or any lower-power state: this should be an error.
1171 */
omap_set_pwrdm_state(struct powerdomain * pwrdm,u8 pwrst)1172 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
1173 {
1174 u8 next_pwrst, sleep_switch;
1175 int curr_pwrst;
1176 int ret = 0;
1177 bool hwsup = false;
1178
1179 if (!pwrdm || IS_ERR(pwrdm))
1180 return -EINVAL;
1181
1182 while (!(pwrdm->pwrsts & (1 << pwrst))) {
1183 if (pwrst == PWRDM_POWER_OFF)
1184 return ret;
1185 pwrst--;
1186 }
1187
1188 pwrdm_lock(pwrdm);
1189
1190 curr_pwrst = pwrdm_read_pwrst(pwrdm);
1191 if (curr_pwrst < 0) {
1192 ret = -EINVAL;
1193 goto osps_out;
1194 }
1195
1196 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
1197 if (curr_pwrst == pwrst && next_pwrst == pwrst)
1198 goto osps_out;
1199
1200 sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
1201 pwrst, &hwsup);
1202
1203 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
1204 if (ret)
1205 pr_err("%s: unable to set power state of powerdomain: %s\n",
1206 __func__, pwrdm->name);
1207
1208 _pwrdm_restore_clkdm_state(pwrdm, sleep_switch, hwsup);
1209
1210 osps_out:
1211 pwrdm_unlock(pwrdm);
1212
1213 return ret;
1214 }
1215
1216 /**
1217 * pwrdm_get_context_loss_count - get powerdomain's context loss count
1218 * @pwrdm: struct powerdomain * to wait for
1219 *
1220 * Context loss count is the sum of powerdomain off-mode counter, the
1221 * logic off counter and the per-bank memory off counter. Returns negative
1222 * (and WARNs) upon error, otherwise, returns the context loss count.
1223 */
pwrdm_get_context_loss_count(struct powerdomain * pwrdm)1224 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
1225 {
1226 int i, count;
1227
1228 if (!pwrdm) {
1229 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
1230 return -ENODEV;
1231 }
1232
1233 count = pwrdm->state_counter[PWRDM_POWER_OFF];
1234 count += pwrdm->ret_logic_off_counter;
1235
1236 for (i = 0; i < pwrdm->banks; i++)
1237 count += pwrdm->ret_mem_off_counter[i];
1238
1239 /*
1240 * Context loss count has to be a non-negative value. Clear the sign
1241 * bit to get a value range from 0 to INT_MAX.
1242 */
1243 count &= INT_MAX;
1244
1245 pr_debug("powerdomain: %s: context loss count = %d\n",
1246 pwrdm->name, count);
1247
1248 return count;
1249 }
1250
1251 /**
1252 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1253 * @pwrdm: struct powerdomain *
1254 *
1255 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1256 * can lose either memory or logic context or if @pwrdm is invalid, or
1257 * returns 0 otherwise. This function is not concerned with how the
1258 * powerdomain registers are programmed (i.e., to go off or not); it's
1259 * concerned with whether it's ever possible for this powerdomain to
1260 * go off while some other part of the chip is active. This function
1261 * assumes that every powerdomain can go to either ON or INACTIVE.
1262 */
pwrdm_can_ever_lose_context(struct powerdomain * pwrdm)1263 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
1264 {
1265 int i;
1266
1267 if (!pwrdm) {
1268 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1269 __func__);
1270 return 1;
1271 }
1272
1273 if (pwrdm->pwrsts & PWRSTS_OFF)
1274 return 1;
1275
1276 if (pwrdm->pwrsts & PWRSTS_RET) {
1277 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
1278 return 1;
1279
1280 for (i = 0; i < pwrdm->banks; i++)
1281 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1282 return 1;
1283 }
1284
1285 for (i = 0; i < pwrdm->banks; i++)
1286 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
1287 return 1;
1288
1289 return 0;
1290 }
1291