summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/powerdomain.c
blob: ca5be83d5019405f1e244db2563e8c0fac37ad30 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
/*
 * OMAP powerdomain control
 *
 * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
 * Copyright (C) 2007-2011 Nokia Corporation
 *
 * Written by Paul Walmsley
 * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
 * State counting code by Tero Kristo <tero.kristo@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <trace/events/power.h>

#include "cm2xxx_3xxx.h"
#include "prcm44xx.h"
#include "cm44xx.h"
#include "prm2xxx_3xxx.h"
#include "prm44xx.h"

#include <asm/cpu.h>

#include <plat/prcm.h>

#include "powerdomain.h"
#include "clockdomain.h"

#include "soc.h"
#include "pm.h"

#define PWRDM_TRACE_STATES_FLAG	(1<<31)

enum {
	PWRDM_STATE_NOW = 0,
	PWRDM_STATE_PREV,
};


/* pwrdm_list contains all registered struct powerdomains */
static LIST_HEAD(pwrdm_list);

static struct pwrdm_ops *arch_pwrdm;

/* Private functions */

static struct powerdomain *_pwrdm_lookup(const char *name)
{
	struct powerdomain *pwrdm, *temp_pwrdm;

	pwrdm = NULL;

	list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
		if (!strcmp(name, temp_pwrdm->name)) {
			pwrdm = temp_pwrdm;
			break;
		}
	}

	return pwrdm;
}

/**
 * _pwrdm_register - register a powerdomain
 * @pwrdm: struct powerdomain * to register
 *
 * Adds a powerdomain to the internal powerdomain list.  Returns
 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
 * already registered by the provided name, or 0 upon success.
 */
static int _pwrdm_register(struct powerdomain *pwrdm)
{
	int i;
	struct voltagedomain *voltdm;

	if (!pwrdm || !pwrdm->name)
		return -EINVAL;

	if (cpu_is_omap44xx() &&
	    pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
		pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
		       pwrdm->name);
		return -EINVAL;
	}

	if (_pwrdm_lookup(pwrdm->name))
		return -EEXIST;

	voltdm = voltdm_lookup(pwrdm->voltdm.name);
	if (!voltdm) {
		pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
		       pwrdm->name, pwrdm->voltdm.name);
		return -EINVAL;
	}
	pwrdm->voltdm.ptr = voltdm;
	INIT_LIST_HEAD(&pwrdm->voltdm_node);
	voltdm_add_pwrdm(voltdm, pwrdm);

	list_add(&pwrdm->node, &pwrdm_list);

	/* Initialize the powerdomain's state counter */
	for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
		pwrdm->state_counter[i] = 0;

	pwrdm->ret_logic_off_counter = 0;
	for (i = 0; i < pwrdm->banks; i++)
		pwrdm->ret_mem_off_counter[i] = 0;

	pwrdm_wait_transition(pwrdm);
	pwrdm->state = pwrdm_read_pwrst(pwrdm);
	pwrdm->state_counter[pwrdm->state] = 1;

	pr_debug("powerdomain: registered %s\n", pwrdm->name);

	return 0;
}

static void _update_logic_membank_counters(struct powerdomain *pwrdm)
{
	int i;
	u8 prev_logic_pwrst, prev_mem_pwrst;

	prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
	if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
	    (prev_logic_pwrst == PWRDM_POWER_OFF))
		pwrdm->ret_logic_off_counter++;

	for (i = 0; i < pwrdm->banks; i++) {
		prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);

		if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
		    (prev_mem_pwrst == PWRDM_POWER_OFF))
			pwrdm->ret_mem_off_counter[i]++;
	}
}

static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
{

	int prev, state, trace_state = 0;

	if (pwrdm == NULL)
		return -EINVAL;

	state = pwrdm_read_pwrst(pwrdm);

	switch (flag) {
	case PWRDM_STATE_NOW:
		prev = pwrdm->state;
		break;
	case PWRDM_STATE_PREV:
		prev = pwrdm_read_prev_pwrst(pwrdm);
		if (pwrdm->state != prev)
			pwrdm->state_counter[prev]++;
		if (prev == PWRDM_POWER_RET)
			_update_logic_membank_counters(pwrdm);
		/*
		 * If the power domain did not hit the desired state,
		 * generate a trace event with both the desired and hit states
		 */
		if (state != prev) {
			trace_state = (PWRDM_TRACE_STATES_FLAG |
				       ((state & OMAP_POWERSTATE_MASK) << 8) |
				       ((prev & OMAP_POWERSTATE_MASK) << 0));
			trace_power_domain_target(pwrdm->name, trace_state,
						  smp_processor_id());
		}
		break;
	default:
		return -EINVAL;
	}

	if (state != prev)
		pwrdm->state_counter[state]++;

	pm_dbg_update_time(pwrdm, prev);

	pwrdm->state = state;

	return 0;
}

static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
{
	pwrdm_clear_all_prev_pwrst(pwrdm);
	_pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
	return 0;
}

static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
{
	_pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
	return 0;
}

/* Public functions */

/**
 * pwrdm_register_platform_funcs - register powerdomain implementation fns
 * @po: func pointers for arch specific implementations
 *
 * Register the list of function pointers used to implement the
 * powerdomain functions on different OMAP SoCs.  Should be called
 * before any other pwrdm_register*() function.  Returns -EINVAL if
 * @po is null, -EEXIST if platform functions have already been
 * registered, or 0 upon success.
 */
int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
{
	if (!po)
		return -EINVAL;

	if (arch_pwrdm)
		return -EEXIST;

	arch_pwrdm = po;

	return 0;
}

/**
 * pwrdm_register_pwrdms - register SoC powerdomains
 * @ps: pointer to an array of struct powerdomain to register
 *
 * Register the powerdomains available on a particular OMAP SoC.  Must
 * be called after pwrdm_register_platform_funcs().  May be called
 * multiple times.  Returns -EACCES if called before
 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
 * null; or 0 upon success.
 */
int pwrdm_register_pwrdms(struct powerdomain **ps)
{
	struct powerdomain **p = NULL;

	if (!arch_pwrdm)
		return -EEXIST;

	if (!ps)
		return -EINVAL;

	for (p = ps; *p; p++)
		_pwrdm_register(*p);

	return 0;
}

/**
 * pwrdm_complete_init - set up the powerdomain layer
 *
 * Do whatever is necessary to initialize registered powerdomains and
 * powerdomain code.  Currently, this programs the next power state
 * for each powerdomain to ON.  This prevents powerdomains from
 * unexpectedly losing context or entering high wakeup latency modes
 * with non-power-management-enabled kernels.  Must be called after
 * pwrdm_register_pwrdms().  Returns -EACCES if called before
 * pwrdm_register_pwrdms(), or 0 upon success.
 */
int pwrdm_complete_init(void)
{
	struct powerdomain *temp_p;

	if (list_empty(&pwrdm_list))
		return -EACCES;

	list_for_each_entry(temp_p, &pwrdm_list, node)
		pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);

	return 0;
}

/**
 * pwrdm_lookup - look up a powerdomain by name, return a pointer
 * @name: name of powerdomain
 *
 * Find a registered powerdomain by its name @name.  Returns a pointer
 * to the struct powerdomain if found, or NULL otherwise.
 */
struct powerdomain *pwrdm_lookup(const char *name)
{
	struct powerdomain *pwrdm;

	if (!name)
		return NULL;

	pwrdm = _pwrdm_lookup(name);

	return pwrdm;
}

/**
 * pwrdm_for_each - call function on each registered clockdomain
 * @fn: callback function *
 *
 * Call the supplied function @fn for each registered powerdomain.
 * The callback function @fn can return anything but 0 to bail out
 * early from the iterator.  Returns the last return value of the
 * callback function, which should be 0 for success or anything else
 * to indicate failure; or -EINVAL if the function pointer is null.
 */
int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
		   void *user)
{
	struct powerdomain *temp_pwrdm;
	int ret = 0;

	if (!fn)
		return -EINVAL;

	list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
		ret = (*fn)(temp_pwrdm, user);
		if (ret)
			break;
	}

	return ret;
}

/**
 * pwrdm_add_clkdm - add a clockdomain to a powerdomain
 * @pwrdm: struct powerdomain * to add the clockdomain to
 * @clkdm: struct clockdomain * to associate with a powerdomain
 *
 * Associate the clockdomain @clkdm with a powerdomain @pwrdm.  This
 * enables the use of pwrdm_for_each_clkdm().  Returns -EINVAL if
 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
 * or 0 upon success.
 */
int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
{
	int i;
	int ret = -EINVAL;

	if (!pwrdm || !clkdm)
		return -EINVAL;

	pr_debug("powerdomain: associating clockdomain %s with powerdomain "
		 "%s\n", clkdm->name, pwrdm->name);

	for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
		if (!pwrdm->pwrdm_clkdms[i])
			break;
#ifdef DEBUG
		if (pwrdm->pwrdm_clkdms[i] == clkdm) {
			ret = -EINVAL;
			goto pac_exit;
		}
#endif
	}

	if (i == PWRDM_MAX_CLKDMS) {
		pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
			 "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
		WARN_ON(1);
		ret = -ENOMEM;
		goto pac_exit;
	}

	pwrdm->pwrdm_clkdms[i] = clkdm;

	ret = 0;

pac_exit:
	return ret;
}

/**
 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
 * @pwrdm: struct powerdomain * to add the clockdomain to
 * @clkdm: struct clockdomain * to associate with a powerdomain
 *
 * Dissociate the clockdomain @clkdm from the powerdomain
 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
 * if @clkdm was not associated with the powerdomain, or 0 upon
 * success.
 */
int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
{
	int ret = -EINVAL;
	int i;

	if (!pwrdm || !clkdm)
		return -EINVAL;

	pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
		 "%s\n", clkdm->name, pwrdm->name);

	for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
		if (pwrdm->pwrdm_clkdms[i] == clkdm)
			break;

	if (i == PWRDM_MAX_CLKDMS) {
		pr_debug("powerdomain: clkdm %s not associated with pwrdm "
			 "%s ?!\n", clkdm->name, pwrdm->name);
		ret = -ENOENT;
		goto pdc_exit;
	}

	pwrdm->pwrdm_clkdms[i] = NULL;

	ret = 0;

pdc_exit:
	return ret;
}

/**
 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
 * @pwrdm: struct powerdomain * to iterate over
 * @fn: callback function *
 *
 * Call the supplied function @fn for each clockdomain in the powerdomain
 * @pwrdm.  The callback function can return anything but 0 to bail
 * out early from the iterator.  Returns -EINVAL if presented with
 * invalid pointers; or passes along the last return value of the
 * callback function, which should be 0 for success or anything else
 * to indicate failure.
 */
int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
			 int (*fn)(struct powerdomain *pwrdm,
				   struct clockdomain *clkdm))
{
	int ret = 0;
	int i;

	if (!fn)
		return -EINVAL;

	for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
		ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);

	return ret;
}

/**
 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in
 * @pwrdm: struct powerdomain *
 *
 * Return a pointer to the struct voltageomain that the specified powerdomain
 * @pwrdm exists in.
 */
struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm)
{
	return pwrdm->voltdm.ptr;
}

/**
 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
 * @pwrdm: struct powerdomain *
 *
 * Return the number of controllable memory banks in powerdomain @pwrdm,
 * starting with 1.  Returns -EINVAL if the powerdomain pointer is null.
 */
int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
{
	if (!pwrdm)
		return -EINVAL;

	return pwrdm->banks;
}

/**
 * pwrdm_set_next_pwrst - set next powerdomain power state
 * @pwrdm: struct powerdomain * to set
 * @pwrst: one of the PWRDM_POWER_* macros
 *
 * Set the powerdomain @pwrdm's next power state to @pwrst.  The powerdomain
 * may not enter this state immediately if the preconditions for this state
 * have not been satisfied.  Returns -EINVAL if the powerdomain pointer is
 * null or if the power state is invalid for the powerdomin, or returns 0
 * upon success.
 */
int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (!(pwrdm->pwrsts & (1 << pwrst)))
		return -EINVAL;

	pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
		 pwrdm->name, pwrst);

	if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
		/* Trace the pwrdm desired target state */
		trace_power_domain_target(pwrdm->name, pwrst,
					  smp_processor_id());
		/* Program the pwrdm desired target state */
		ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
	}

	return ret;
}

/**
 * pwrdm_read_next_pwrst - get next powerdomain power state
 * @pwrdm: struct powerdomain * to get power state
 *
 * Return the powerdomain @pwrdm's next power state.  Returns -EINVAL
 * if the powerdomain pointer is null or returns the next power state
 * upon success.
 */
int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
		ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_read_pwrst - get current powerdomain power state
 * @pwrdm: struct powerdomain * to get power state
 *
 * Return the powerdomain @pwrdm's current power state.	Returns -EINVAL
 * if the powerdomain pointer is null or returns the current power state
 * upon success. Note that if the power domain only supports the ON state
 * then just return ON as the current state.
 */
int pwrdm_read_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (pwrdm->pwrsts == PWRSTS_ON)
		return PWRDM_POWER_ON;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
		ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_read_prev_pwrst - get previous powerdomain power state
 * @pwrdm: struct powerdomain * to get previous power state
 *
 * Return the powerdomain @pwrdm's previous power state.  Returns -EINVAL
 * if the powerdomain pointer is null or returns the previous power state
 * upon success.
 */
int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
		ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
 * @pwrdm: struct powerdomain * to set
 * @pwrst: one of the PWRDM_POWER_* macros
 *
 * Set the next power state @pwrst that the logic portion of the
 * powerdomain @pwrdm will enter when the powerdomain enters retention.
 * This will be either RETENTION or OFF, if supported.  Returns
 * -EINVAL if the powerdomain pointer is null or the target power
 * state is not not supported, or returns 0 upon success.
 */
int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
		return -EINVAL;

	pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
		 pwrdm->name, pwrst);

	if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
		ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);

	return ret;
}

/**
 * pwrdm_set_mem_onst - set memory power state while powerdomain ON
 * @pwrdm: struct powerdomain * to set
 * @bank: memory bank number to set (0-3)
 * @pwrst: one of the PWRDM_POWER_* macros
 *
 * Set the next power state @pwrst that memory bank @bank of the
 * powerdomain @pwrdm will enter when the powerdomain enters the ON
 * state.  @bank will be a number from 0 to 3, and represents different
 * types of memory, depending on the powerdomain.  Returns -EINVAL if
 * the powerdomain pointer is null or the target power state is not
 * not supported for this memory bank, -EEXIST if the target memory
 * bank does not exist or is not controllable, or returns 0 upon
 * success.
 */
int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (pwrdm->banks < (bank + 1))
		return -EEXIST;

	if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
		return -EINVAL;

	pr_debug("powerdomain: setting next memory powerstate for domain %s "
		 "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);

	if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
		ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);

	return ret;
}

/**
 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
 * @pwrdm: struct powerdomain * to set
 * @bank: memory bank number to set (0-3)
 * @pwrst: one of the PWRDM_POWER_* macros
 *
 * Set the next power state @pwrst that memory bank @bank of the
 * powerdomain @pwrdm will enter when the powerdomain enters the
 * RETENTION state.  Bank will be a number from 0 to 3, and represents
 * different types of memory, depending on the powerdomain.  @pwrst
 * will be either RETENTION or OFF, if supported.  Returns -EINVAL if
 * the powerdomain pointer is null or the target power state is not
 * not supported for this memory bank, -EEXIST if the target memory
 * bank does not exist or is not controllable, or returns 0 upon
 * success.
 */
int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (pwrdm->banks < (bank + 1))
		return -EEXIST;

	if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
		return -EINVAL;

	pr_debug("powerdomain: setting next memory powerstate for domain %s "
		 "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);

	if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
		ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);

	return ret;
}

/**
 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
 * @pwrdm: struct powerdomain * to get current logic retention power state
 *
 * Return the power state that the logic portion of powerdomain @pwrdm
 * will enter when the powerdomain enters retention.  Returns -EINVAL
 * if the powerdomain pointer is null or returns the logic retention
 * power state upon success.
 */
int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
		ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
 * @pwrdm: struct powerdomain * to get previous logic power state
 *
 * Return the powerdomain @pwrdm's previous logic power state.  Returns
 * -EINVAL if the powerdomain pointer is null or returns the previous
 * logic power state upon success.
 */
int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
		ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_read_logic_retst - get next powerdomain logic power state
 * @pwrdm: struct powerdomain * to get next logic power state
 *
 * Return the powerdomain pwrdm's logic power state.  Returns -EINVAL
 * if the powerdomain pointer is null or returns the next logic
 * power state upon success.
 */
int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
		ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);

	return ret;
}

/**
 * pwrdm_read_mem_pwrst - get current memory bank power state
 * @pwrdm: struct powerdomain * to get current memory bank power state
 * @bank: memory bank number (0-3)
 *
 * Return the powerdomain @pwrdm's current memory power state for bank
 * @bank.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 * the target memory bank does not exist or is not controllable, or
 * returns the current memory power state upon success.
 */
int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	if (pwrdm->banks < (bank + 1))
		return ret;

	if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
		bank = 1;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
		ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);

	return ret;
}

/**
 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
 * @pwrdm: struct powerdomain * to get previous memory bank power state
 * @bank: memory bank number (0-3)
 *
 * Return the powerdomain @pwrdm's previous memory power state for
 * bank @bank.  Returns -EINVAL if the powerdomain pointer is null,
 * -EEXIST if the target memory bank does not exist or is not
 * controllable, or returns the previous memory power state upon
 * success.
 */
int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	if (pwrdm->banks < (bank + 1))
		return ret;

	if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
		bank = 1;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
		ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);

	return ret;
}

/**
 * pwrdm_read_mem_retst - get next memory bank power state
 * @pwrdm: struct powerdomain * to get mext memory bank power state
 * @bank: memory bank number (0-3)
 *
 * Return the powerdomain pwrdm's next memory power state for bank
 * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 * the target memory bank does not exist or is not controllable, or
 * returns the next memory power state upon success.
 */
int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	if (pwrdm->banks < (bank + 1))
		return ret;

	if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
		ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);

	return ret;
}

/**
 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
 * @pwrdm: struct powerdomain * to clear
 *
 * Clear the powerdomain's previous power state register @pwrdm.
 * Clears the entire register, including logic and memory bank
 * previous power states.  Returns -EINVAL if the powerdomain pointer
 * is null, or returns 0 upon success.
 */
int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	/*
	 * XXX should get the powerdomain's current state here;
	 * warn & fail if it is not ON.
	 */

	pr_debug("powerdomain: clearing previous power state reg for %s\n",
		 pwrdm->name);

	if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
		ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);

	return ret;
}

/**
 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
 * @pwrdm: struct powerdomain *
 *
 * Enable automatic context save-and-restore upon power state change
 * for some devices in the powerdomain @pwrdm.  Warning: this only
 * affects a subset of devices in a powerdomain; check the TRM
 * closely.  Returns -EINVAL if the powerdomain pointer is null or if
 * the powerdomain does not support automatic save-and-restore, or
 * returns 0 upon success.
 */
int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
		return ret;

	pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
		 pwrdm->name);

	if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
		ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);

	return ret;
}

/**
 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
 * @pwrdm: struct powerdomain *
 *
 * Disable automatic context save-and-restore upon power state change
 * for some devices in the powerdomain @pwrdm.  Warning: this only
 * affects a subset of devices in a powerdomain; check the TRM
 * closely.  Returns -EINVAL if the powerdomain pointer is null or if
 * the powerdomain does not support automatic save-and-restore, or
 * returns 0 upon success.
 */
int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return ret;

	if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
		return ret;

	pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
		 pwrdm->name);

	if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
		ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);

	return ret;
}

/**
 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
 * @pwrdm: struct powerdomain *
 *
 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
 * for some devices, or 0 if it does not.
 */
bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
{
	return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
}

/**
 * pwrdm_set_lowpwrstchange - Request a low power state change
 * @pwrdm: struct powerdomain *
 *
 * Allows a powerdomain to transtion to a lower power sleep state
 * from an existing sleep state without waking up the powerdomain.
 * Returns -EINVAL if the powerdomain pointer is null or if the
 * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
 * upon success.
 */
int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
		return -EINVAL;

	pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
		 pwrdm->name);

	if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange)
		ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);

	return ret;
}

/**
 * pwrdm_wait_transition - wait for powerdomain power transition to finish
 * @pwrdm: struct powerdomain * to wait for
 *
 * If the powerdomain @pwrdm is in the process of a state transition,
 * spin until it completes the power transition, or until an iteration
 * bailout value is reached. Returns -EINVAL if the powerdomain
 * pointer is null, -EAGAIN if the bailout value was reached, or
 * returns 0 upon success.
 */
int pwrdm_wait_transition(struct powerdomain *pwrdm)
{
	int ret = -EINVAL;

	if (!pwrdm)
		return -EINVAL;

	if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
		ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);

	return ret;
}

int pwrdm_state_switch(struct powerdomain *pwrdm)
{
	int ret;

	ret = pwrdm_wait_transition(pwrdm);
	if (!ret)
		ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);

	return ret;
}

int pwrdm_pre_transition(struct powerdomain *pwrdm)
{
	if (pwrdm)
		_pwrdm_pre_transition_cb(pwrdm, NULL);
	else
		pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);

	return 0;
}

int pwrdm_post_transition(struct powerdomain *pwrdm)
{
	if (pwrdm)
		_pwrdm_post_transition_cb(pwrdm, NULL);
	else
		pwrdm_for_each(_pwrdm_post_transition_cb, NULL);

	return 0;
}

/**
 * pwrdm_get_context_loss_count - get powerdomain's context loss count
 * @pwrdm: struct powerdomain * to wait for
 *
 * Context loss count is the sum of powerdomain off-mode counter, the
 * logic off counter and the per-bank memory off counter.  Returns negative
 * (and WARNs) upon error, otherwise, returns the context loss count.
 */
int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
{
	int i, count;

	if (!pwrdm) {
		WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
		return -ENODEV;
	}

	count = pwrdm->state_counter[PWRDM_POWER_OFF];
	count += pwrdm->ret_logic_off_counter;

	for (i = 0; i < pwrdm->banks; i++)
		count += pwrdm->ret_mem_off_counter[i];

	/*
	 * Context loss count has to be a non-negative value. Clear the sign
	 * bit to get a value range from 0 to INT_MAX.
	 */
	count &= INT_MAX;

	pr_debug("powerdomain: %s: context loss count = %d\n",
		 pwrdm->name, count);

	return count;
}

/**
 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
 * @pwrdm: struct powerdomain *
 *
 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
 * can lose either memory or logic context or if @pwrdm is invalid, or
 * returns 0 otherwise.  This function is not concerned with how the
 * powerdomain registers are programmed (i.e., to go off or not); it's
 * concerned with whether it's ever possible for this powerdomain to
 * go off while some other part of the chip is active.  This function
 * assumes that every powerdomain can go to either ON or INACTIVE.
 */
bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
{
	int i;

	if (IS_ERR_OR_NULL(pwrdm)) {
		pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
			 __func__);
		return 1;
	}

	if (pwrdm->pwrsts & PWRSTS_OFF)
		return 1;

	if (pwrdm->pwrsts & PWRSTS_RET) {
		if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
			return 1;

		for (i = 0; i < pwrdm->banks; i++)
			if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
				return 1;
	}

	for (i = 0; i < pwrdm->banks; i++)
		if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
			return 1;

	return 0;
}
OpenPOWER on IntegriCloud