Bootlin logo

Elixir Cross Referencer

   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
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
/*
 * 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 <linux/spinlock.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 "powerdomain.h"
#include "clockdomain.h"
#include "voltage.h"

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

#define PWRDM_TRACE_STATES_FLAG	(1<<31)

enum {
	PWRDM_STATE_NOW = 0,
	PWRDM_STATE_PREV,
};

/*
 * Types of sleep_switch used internally in omap_set_pwrdm_state()
 * and its associated static functions
 *
 * XXX Better documentation is needed here
 */
#define ALREADYACTIVE_SWITCH		0
#define FORCEWAKEUP_SWITCH		1
#define LOWPOWERSTATE_SWITCH		2

/* 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;

	if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
		if (!arch_pwrdm->pwrdm_has_voltdm())
			goto skip_voltdm;

	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);
skip_voltdm:
	spin_lock_init(&pwrdm->_lock);

	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;

	if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
		arch_pwrdm->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, next, 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
		 */
		next = pwrdm_read_next_pwrst(pwrdm);
		if (next != prev) {
			trace_state = (PWRDM_TRACE_STATES_FLAG |
				       ((next & OMAP_POWERSTATE_MASK) << 8) |
				       ((prev & OMAP_POWERSTATE_MASK) << 0));
			trace_power_domain_target_rcuidle(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;
}

/**
 * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
 * @pwrdm: struct powerdomain * to operate on
 * @curr_pwrst: current power state of @pwrdm
 * @pwrst: power state to switch to
 *
 * Determine whether the powerdomain needs to be turned on before
 * attempting to switch power states.  Called by
 * omap_set_pwrdm_state().  NOTE that if the powerdomain contains
 * multiple clockdomains, this code assumes that the first clockdomain
 * supports software-supervised wakeup mode - potentially a problem.
 * Returns the power state switch mode currently in use (see the
 * "Types of sleep_switch" comment above).
 */
static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
					       u8 curr_pwrst, u8 pwrst)
{
	u8 sleep_switch;

	if (curr_pwrst < PWRDM_POWER_ON) {
		if (curr_pwrst > pwrst &&
		    pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
		    arch_pwrdm->pwrdm_set_lowpwrstchange) {
			sleep_switch = LOWPOWERSTATE_SWITCH;
		} else {
			clkdm_deny_idle_nolock(pwrdm->pwrdm_clkdms[0]);
			sleep_switch = FORCEWAKEUP_SWITCH;
		}
	} else {
		sleep_switch = ALREADYACTIVE_SWITCH;
	}

	return sleep_switch;
}

/**
 * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
 * @pwrdm: struct powerdomain * to operate on
 * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
 *
 * Restore the clockdomain state perturbed by
 * _pwrdm_save_clkdm_state_and_activate(), and call the power state
 * bookkeeping code.  Called by omap_set_pwrdm_state().  NOTE that if
 * the powerdomain contains multiple clockdomains, this assumes that
 * the first associated clockdomain supports either
 * hardware-supervised idle control in the register, or
 * software-supervised sleep.  No return value.
 */
static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
				       u8 sleep_switch)
{
	switch (sleep_switch) {
	case FORCEWAKEUP_SWITCH:
		clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
		break;
	case LOWPOWERSTATE_SWITCH:
		if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
		    arch_pwrdm->pwrdm_set_lowpwrstchange)
			arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
		pwrdm_state_switch_nolock(pwrdm);
		break;
	}
}

/* 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_lock - acquire a Linux spinlock on a powerdomain
 * @pwrdm: struct powerdomain * to lock
 *
 * Acquire the powerdomain spinlock on @pwrdm.  No return value.
 */
void pwrdm_lock(struct powerdomain *pwrdm)
	__acquires(&pwrdm->_lock)
{
	spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
}

/**
 * pwrdm_unlock - release a Linux spinlock on a powerdomain
 * @pwrdm: struct powerdomain * to unlock
 *
 * Release the powerdomain spinlock on @pwrdm.  No return value.
 */
void pwrdm_unlock(struct powerdomain *pwrdm)
	__releases(&pwrdm->_lock)
{
	spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
}

/**
 * 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: %s: associating clockdomain %s\n",
		 pwrdm->name, clkdm->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: %s: increase PWRDM_MAX_CLKDMS for 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_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: %s: setting next powerstate 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_rcuidle(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: %s: setting next logic powerstate 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: %s: setting next memory powerstate for 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: %s: setting next memory powerstate for 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: %s: clearing previous power state reg\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;
}

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

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

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

	return ret;
}

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

	pwrdm_lock(pwrdm);
	ret = pwrdm_state_switch_nolock(pwrdm);
	pwrdm_unlock(pwrdm);

	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_valid_lp_state() - Find best match deep power state
 * @pwrdm:	power domain for which we want to find best match
 * @is_logic_state: Are we looking for logic state match here? Should
 *		    be one of PWRDM_xxx macro values
 * @req_state:	requested power state
 *
 * Returns: closest match for requested power state. default fallback
 * is RET for logic state and ON for power state.
 *
 * This does a search from the power domain data looking for the
 * closest valid power domain state that the hardware can achieve.
 * PRCM definitions for PWRSTCTRL allows us to program whatever
 * configuration we'd like, and PRCM will actually attempt such
 * a transition, however if the powerdomain does not actually support it,
 * we endup with a hung system. The valid power domain states are already
 * available in our powerdomain data files. So this function tries to do
 * the following:
 * a) find if we have an exact match to the request - no issues.
 * b) else find if a deeper power state is possible.
 * c) failing which, it tries to find closest higher power state for the
 * request.
 */
u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
			    bool is_logic_state, u8 req_state)
{
	u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
			pwrdm->pwrsts;
	/* For logic, ret is highest and others, ON is highest */
	u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
	u8 new_pwrst;
	bool found;

	/* If it is already supported, nothing to search */
	if (pwrdm_states & BIT(req_state))
		return req_state;

	if (!req_state)
		goto up_search;

	/*
	 * So, we dont have a exact match
	 * Can we get a deeper power state match?
	 */
	new_pwrst = req_state - 1;
	found = true;
	while (!(pwrdm_states & BIT(new_pwrst))) {
		/* No match even at OFF? Not available */
		if (new_pwrst == PWRDM_POWER_OFF) {
			found = false;
			break;
		}
		new_pwrst--;
	}

	if (found)
		goto done;

up_search:
	/* OK, no deeper ones, can we get a higher match? */
	new_pwrst = req_state + 1;
	while (!(pwrdm_states & BIT(new_pwrst))) {
		if (new_pwrst > PWRDM_POWER_ON) {
			WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
			     pwrdm->name);
			return PWRDM_POWER_ON;
		}

		if (new_pwrst == default_pwrst)
			break;
		new_pwrst++;
	}
done:
	return new_pwrst;
}

/**
 * omap_set_pwrdm_state - change a powerdomain's current power state
 * @pwrdm: struct powerdomain * to change the power state of
 * @pwrst: power state to change to
 *
 * Change the current hardware power state of the powerdomain
 * represented by @pwrdm to the power state represented by @pwrst.
 * Returns -EINVAL if @pwrdm is null or invalid or if the
 * powerdomain's current power state could not be read, or returns 0
 * upon success or if @pwrdm does not support @pwrst or any
 * lower-power state.  XXX Should not return 0 if the @pwrdm does not
 * support @pwrst or any lower-power state: this should be an error.
 */
int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
{
	u8 next_pwrst, sleep_switch;
	int curr_pwrst;
	int ret = 0;

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

	while (!(pwrdm->pwrsts & (1 << pwrst))) {
		if (pwrst == PWRDM_POWER_OFF)
			return ret;
		pwrst--;
	}

	pwrdm_lock(pwrdm);

	curr_pwrst = pwrdm_read_pwrst(pwrdm);
	if (curr_pwrst < 0) {
		ret = -EINVAL;
		goto osps_out;
	}

	next_pwrst = pwrdm_read_next_pwrst(pwrdm);
	if (curr_pwrst == pwrst && next_pwrst == pwrst)
		goto osps_out;

	sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
							    pwrst);

	ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
	if (ret)
		pr_err("%s: unable to set power state of powerdomain: %s\n",
		       __func__, pwrdm->name);

	_pwrdm_restore_clkdm_state(pwrdm, sleep_switch);

osps_out:
	pwrdm_unlock(pwrdm);

	return ret;
}

/**
 * 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 (!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;
}