summaryrefslogtreecommitdiff
path: root/drivers/clk/renesas/renesas-cpg-mssr.c
blob: 1a0cdf001b2f27ca13f6c65ba38a3252ebf11eca (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
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
// SPDX-License-Identifier: GPL-2.0
/*
 * Renesas Clock Pulse Generator / Module Standby and Software Reset
 *
 * Copyright (C) 2015 Glider bvba
 *
 * Based on clk-mstp.c, clk-rcar-gen2.c, and clk-rcar-gen3.c
 *
 * Copyright (C) 2013 Ideas On Board SPRL
 * Copyright (C) 2015 Renesas Electronics Corp.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clk/renesas.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/psci.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>

#include <dt-bindings/clock/renesas-cpg-mssr.h>

#include "renesas-cpg-mssr.h"
#include "clk-div6.h"

#ifdef DEBUG
#define WARN_DEBUG(x)	WARN_ON(x)
#else
#define WARN_DEBUG(x)	do { } while (0)
#endif


/*
 * Module Standby and Software Reset register offets.
 *
 * If the registers exist, these are valid for SH-Mobile, R-Mobile,
 * R-Car Gen2, R-Car Gen3, and RZ/G1.
 * These are NOT valid for R-Car Gen1 and RZ/A1!
 */

/*
 * Module Stop Status Register offsets
 */

static const u16 mstpsr[] = {
	0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
	0x9A0, 0x9A4, 0x9A8, 0x9AC,
};

static const u16 mstpsr_for_gen4[] = {
	0x2E00, 0x2E04, 0x2E08, 0x2E0C, 0x2E10, 0x2E14, 0x2E18, 0x2E1C,
	0x2E20, 0x2E24, 0x2E28, 0x2E2C, 0x2E30, 0x2E34, 0x2E38, 0x2E3C,
	0x2E40, 0x2E44, 0x2E48, 0x2E4C, 0x2E50, 0x2E54, 0x2E58, 0x2E5C,
	0x2E60, 0x2E64, 0x2E68, 0x2E6C,
};

/*
 * System Module Stop Control Register offsets
 */

static const u16 smstpcr[] = {
	0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
	0x990, 0x994, 0x998, 0x99C,
};

static const u16 mstpcr_for_gen4[] = {
	0x2D00, 0x2D04, 0x2D08, 0x2D0C, 0x2D10, 0x2D14, 0x2D18, 0x2D1C,
	0x2D20, 0x2D24, 0x2D28, 0x2D2C, 0x2D30, 0x2D34, 0x2D38, 0x2D3C,
	0x2D40, 0x2D44, 0x2D48, 0x2D4C, 0x2D50, 0x2D54, 0x2D58, 0x2D5C,
	0x2D60, 0x2D64, 0x2D68, 0x2D6C,
};

/*
 * Standby Control Register offsets (RZ/A)
 * Base address is FRQCR register
 */

static const u16 stbcr[] = {
	0xFFFF/*dummy*/, 0x010, 0x014, 0x410, 0x414, 0x418, 0x41C, 0x420,
	0x424, 0x428, 0x42C,
};

/*
 * Software Reset Register offsets
 */

static const u16 srcr[] = {
	0x0A0, 0x0A8, 0x0B0, 0x0B8, 0x0BC, 0x0C4, 0x1C8, 0x1CC,
	0x920, 0x924, 0x928, 0x92C,
};

static const u16 srcr_for_gen4[] = {
	0x2C00, 0x2C04, 0x2C08, 0x2C0C, 0x2C10, 0x2C14, 0x2C18, 0x2C1C,
	0x2C20, 0x2C24, 0x2C28, 0x2C2C, 0x2C30, 0x2C34, 0x2C38, 0x2C3C,
	0x2C40, 0x2C44, 0x2C48, 0x2C4C, 0x2C50, 0x2C54, 0x2C58, 0x2C5C,
	0x2C60, 0x2C64, 0x2C68, 0x2C6C,
};

/*
 * Software Reset Clearing Register offsets
 */

static const u16 srstclr[] = {
	0x940, 0x944, 0x948, 0x94C, 0x950, 0x954, 0x958, 0x95C,
	0x960, 0x964, 0x968, 0x96C,
};

static const u16 srstclr_for_gen4[] = {
	0x2C80, 0x2C84, 0x2C88, 0x2C8C, 0x2C90, 0x2C94, 0x2C98, 0x2C9C,
	0x2CA0, 0x2CA4, 0x2CA8, 0x2CAC, 0x2CB0, 0x2CB4, 0x2CB8, 0x2CBC,
	0x2CC0, 0x2CC4, 0x2CC8, 0x2CCC, 0x2CD0, 0x2CD4, 0x2CD8, 0x2CDC,
	0x2CE0, 0x2CE4, 0x2CE8, 0x2CEC,
};

/**
 * struct cpg_mssr_priv - Clock Pulse Generator / Module Standby
 *                        and Software Reset Private Data
 *
 * @rcdev: Optional reset controller entity
 * @dev: CPG/MSSR device
 * @base: CPG/MSSR register block base address
 * @reg_layout: CPG/MSSR register layout
 * @rmw_lock: protects RMW register accesses
 * @np: Device node in DT for this CPG/MSSR module
 * @num_core_clks: Number of Core Clocks in clks[]
 * @num_mod_clks: Number of Module Clocks in clks[]
 * @last_dt_core_clk: ID of the last Core Clock exported to DT
 * @notifiers: Notifier chain to save/restore clock state for system resume
 * @status_regs: Pointer to status registers array
 * @control_regs: Pointer to control registers array
 * @reset_regs: Pointer to reset registers array
 * @reset_clear_regs:  Pointer to reset clearing registers array
 * @smstpcr_saved: [].mask: Mask of SMSTPCR[] bits under our control
 *                 [].val: Saved values of SMSTPCR[]
 * @clks: Array containing all Core and Module Clocks
 */
struct cpg_mssr_priv {
#ifdef CONFIG_RESET_CONTROLLER
	struct reset_controller_dev rcdev;
#endif
	struct device *dev;
	void __iomem *base;
	enum clk_reg_layout reg_layout;
	spinlock_t rmw_lock;
	struct device_node *np;

	unsigned int num_core_clks;
	unsigned int num_mod_clks;
	unsigned int last_dt_core_clk;

	struct raw_notifier_head notifiers;
	const u16 *status_regs;
	const u16 *control_regs;
	const u16 *reset_regs;
	const u16 *reset_clear_regs;
	struct {
		u32 mask;
		u32 val;
	} smstpcr_saved[ARRAY_SIZE(mstpsr_for_gen4)];

	struct clk *clks[];
};

static struct cpg_mssr_priv *cpg_mssr_priv;

/**
 * struct mstp_clock - MSTP gating clock
 * @hw: handle between common and hardware-specific interfaces
 * @index: MSTP clock number
 * @priv: CPG/MSSR private data
 */
struct mstp_clock {
	struct clk_hw hw;
	u32 index;
	struct cpg_mssr_priv *priv;
};

#define to_mstp_clock(_hw) container_of(_hw, struct mstp_clock, hw)

static int cpg_mstp_clock_endisable(struct clk_hw *hw, bool enable)
{
	struct mstp_clock *clock = to_mstp_clock(hw);
	struct cpg_mssr_priv *priv = clock->priv;
	unsigned int reg = clock->index / 32;
	unsigned int bit = clock->index % 32;
	struct device *dev = priv->dev;
	u32 bitmask = BIT(bit);
	unsigned long flags;
	unsigned int i;
	u32 value;

	dev_dbg(dev, "MSTP %u%02u/%pC %s\n", reg, bit, hw->clk,
		enable ? "ON" : "OFF");
	spin_lock_irqsave(&priv->rmw_lock, flags);

	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
		value = readb(priv->base + priv->control_regs[reg]);
		if (enable)
			value &= ~bitmask;
		else
			value |= bitmask;
		writeb(value, priv->base + priv->control_regs[reg]);

		/* dummy read to ensure write has completed */
		readb(priv->base + priv->control_regs[reg]);
		barrier_data(priv->base + priv->control_regs[reg]);
	} else {
		value = readl(priv->base + priv->control_regs[reg]);
		if (enable)
			value &= ~bitmask;
		else
			value |= bitmask;
		writel(value, priv->base + priv->control_regs[reg]);
	}

	spin_unlock_irqrestore(&priv->rmw_lock, flags);

	if (!enable || priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
		return 0;

	for (i = 1000; i > 0; --i) {
		if (!(readl(priv->base + priv->status_regs[reg]) & bitmask))
			break;
		cpu_relax();
	}

	if (!i) {
		dev_err(dev, "Failed to enable SMSTP %p[%d]\n",
			priv->base + priv->control_regs[reg], bit);
		return -ETIMEDOUT;
	}

	return 0;
}

static int cpg_mstp_clock_enable(struct clk_hw *hw)
{
	return cpg_mstp_clock_endisable(hw, true);
}

static void cpg_mstp_clock_disable(struct clk_hw *hw)
{
	cpg_mstp_clock_endisable(hw, false);
}

static int cpg_mstp_clock_is_enabled(struct clk_hw *hw)
{
	struct mstp_clock *clock = to_mstp_clock(hw);
	struct cpg_mssr_priv *priv = clock->priv;
	u32 value;

	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
		value = readb(priv->base + priv->control_regs[clock->index / 32]);
	else
		value = readl(priv->base + priv->status_regs[clock->index / 32]);

	return !(value & BIT(clock->index % 32));
}

static const struct clk_ops cpg_mstp_clock_ops = {
	.enable = cpg_mstp_clock_enable,
	.disable = cpg_mstp_clock_disable,
	.is_enabled = cpg_mstp_clock_is_enabled,
};

static
struct clk *cpg_mssr_clk_src_twocell_get(struct of_phandle_args *clkspec,
					 void *data)
{
	unsigned int clkidx = clkspec->args[1];
	struct cpg_mssr_priv *priv = data;
	struct device *dev = priv->dev;
	unsigned int idx;
	const char *type;
	struct clk *clk;
	int range_check;

	switch (clkspec->args[0]) {
	case CPG_CORE:
		type = "core";
		if (clkidx > priv->last_dt_core_clk) {
			dev_err(dev, "Invalid %s clock index %u\n", type,
			       clkidx);
			return ERR_PTR(-EINVAL);
		}
		clk = priv->clks[clkidx];
		break;

	case CPG_MOD:
		type = "module";
		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
			idx = MOD_CLK_PACK_10(clkidx);
			range_check = 7 - (clkidx % 10);
		} else {
			idx = MOD_CLK_PACK(clkidx);
			range_check = 31 - (clkidx % 100);
		}
		if (range_check < 0 || idx >= priv->num_mod_clks) {
			dev_err(dev, "Invalid %s clock index %u\n", type,
				clkidx);
			return ERR_PTR(-EINVAL);
		}
		clk = priv->clks[priv->num_core_clks + idx];
		break;

	default:
		dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
		return ERR_PTR(-EINVAL);
	}

	if (IS_ERR(clk))
		dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
		       PTR_ERR(clk));
	else
		dev_dbg(dev, "clock (%u, %u) is %pC at %lu Hz\n",
			clkspec->args[0], clkspec->args[1], clk,
			clk_get_rate(clk));
	return clk;
}

static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
					      const struct cpg_mssr_info *info,
					      struct cpg_mssr_priv *priv)
{
	struct clk *clk = ERR_PTR(-ENOTSUPP), *parent;
	struct device *dev = priv->dev;
	unsigned int id = core->id, div = core->div;
	const char *parent_name;

	WARN_DEBUG(id >= priv->num_core_clks);
	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);

	if (!core->name) {
		/* Skip NULLified clock */
		return;
	}

	switch (core->type) {
	case CLK_TYPE_IN:
		clk = of_clk_get_by_name(priv->np, core->name);
		break;

	case CLK_TYPE_FF:
	case CLK_TYPE_DIV6P1:
	case CLK_TYPE_DIV6_RO:
		WARN_DEBUG(core->parent >= priv->num_core_clks);
		parent = priv->clks[core->parent];
		if (IS_ERR(parent)) {
			clk = parent;
			goto fail;
		}

		parent_name = __clk_get_name(parent);

		if (core->type == CLK_TYPE_DIV6_RO)
			/* Multiply with the DIV6 register value */
			div *= (readl(priv->base + core->offset) & 0x3f) + 1;

		if (core->type == CLK_TYPE_DIV6P1) {
			clk = cpg_div6_register(core->name, 1, &parent_name,
						priv->base + core->offset,
						&priv->notifiers);
		} else {
			clk = clk_register_fixed_factor(NULL, core->name,
							parent_name, 0,
							core->mult, div);
		}
		break;

	case CLK_TYPE_FR:
		clk = clk_register_fixed_rate(NULL, core->name, NULL, 0,
					      core->mult);
		break;

	default:
		if (info->cpg_clk_register)
			clk = info->cpg_clk_register(dev, core, info,
						     priv->clks, priv->base,
						     &priv->notifiers);
		else
			dev_err(dev, "%s has unsupported core clock type %u\n",
				core->name, core->type);
		break;
	}

	if (IS_ERR_OR_NULL(clk))
		goto fail;

	dev_dbg(dev, "Core clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
	priv->clks[id] = clk;
	return;

fail:
	dev_err(dev, "Failed to register %s clock %s: %ld\n", "core",
		core->name, PTR_ERR(clk));
}

static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
					     const struct cpg_mssr_info *info,
					     struct cpg_mssr_priv *priv)
{
	struct mstp_clock *clock = NULL;
	struct device *dev = priv->dev;
	unsigned int id = mod->id;
	struct clk_init_data init = {};
	struct clk *parent, *clk;
	const char *parent_name;
	unsigned int i;

	WARN_DEBUG(id < priv->num_core_clks);
	WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
	WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);

	if (!mod->name) {
		/* Skip NULLified clock */
		return;
	}

	parent = priv->clks[mod->parent];
	if (IS_ERR(parent)) {
		clk = parent;
		goto fail;
	}

	clock = kzalloc(sizeof(*clock), GFP_KERNEL);
	if (!clock) {
		clk = ERR_PTR(-ENOMEM);
		goto fail;
	}

	init.name = mod->name;
	init.ops = &cpg_mstp_clock_ops;
	init.flags = CLK_SET_RATE_PARENT;
	parent_name = __clk_get_name(parent);
	init.parent_names = &parent_name;
	init.num_parents = 1;

	clock->index = id - priv->num_core_clks;
	clock->priv = priv;
	clock->hw.init = &init;

	for (i = 0; i < info->num_crit_mod_clks; i++)
		if (id == info->crit_mod_clks[i] &&
		    cpg_mstp_clock_is_enabled(&clock->hw)) {
			dev_dbg(dev, "MSTP %s setting CLK_IS_CRITICAL\n",
				mod->name);
			init.flags |= CLK_IS_CRITICAL;
			break;
		}

	clk = clk_register(NULL, &clock->hw);
	if (IS_ERR(clk))
		goto fail;

	dev_dbg(dev, "Module clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
	priv->clks[id] = clk;
	priv->smstpcr_saved[clock->index / 32].mask |= BIT(clock->index % 32);
	return;

fail:
	dev_err(dev, "Failed to register %s clock %s: %ld\n", "module",
		mod->name, PTR_ERR(clk));
	kfree(clock);
}

struct cpg_mssr_clk_domain {
	struct generic_pm_domain genpd;
	unsigned int num_core_pm_clks;
	unsigned int core_pm_clks[];
};

static struct cpg_mssr_clk_domain *cpg_mssr_clk_domain;

static bool cpg_mssr_is_pm_clk(const struct of_phandle_args *clkspec,
			       struct cpg_mssr_clk_domain *pd)
{
	unsigned int i;

	if (clkspec->np != pd->genpd.dev.of_node || clkspec->args_count != 2)
		return false;

	switch (clkspec->args[0]) {
	case CPG_CORE:
		for (i = 0; i < pd->num_core_pm_clks; i++)
			if (clkspec->args[1] == pd->core_pm_clks[i])
				return true;
		return false;

	case CPG_MOD:
		return true;

	default:
		return false;
	}
}

int cpg_mssr_attach_dev(struct generic_pm_domain *unused, struct device *dev)
{
	struct cpg_mssr_clk_domain *pd = cpg_mssr_clk_domain;
	struct device_node *np = dev->of_node;
	struct of_phandle_args clkspec;
	struct clk *clk;
	int i = 0;
	int error;

	if (!pd) {
		dev_dbg(dev, "CPG/MSSR clock domain not yet available\n");
		return -EPROBE_DEFER;
	}

	while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
					   &clkspec)) {
		if (cpg_mssr_is_pm_clk(&clkspec, pd))
			goto found;

		of_node_put(clkspec.np);
		i++;
	}

	return 0;

found:
	clk = of_clk_get_from_provider(&clkspec);
	of_node_put(clkspec.np);

	if (IS_ERR(clk))
		return PTR_ERR(clk);

	error = pm_clk_create(dev);
	if (error)
		goto fail_put;

	error = pm_clk_add_clk(dev, clk);
	if (error)
		goto fail_destroy;

	return 0;

fail_destroy:
	pm_clk_destroy(dev);
fail_put:
	clk_put(clk);
	return error;
}

void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
{
	if (!pm_clk_no_clocks(dev))
		pm_clk_destroy(dev);
}

static void cpg_mssr_genpd_remove(void *data)
{
	pm_genpd_remove(data);
}

static int __init cpg_mssr_add_clk_domain(struct device *dev,
					  const unsigned int *core_pm_clks,
					  unsigned int num_core_pm_clks)
{
	struct device_node *np = dev->of_node;
	struct generic_pm_domain *genpd;
	struct cpg_mssr_clk_domain *pd;
	size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
	int ret;

	pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
	if (!pd)
		return -ENOMEM;

	pd->num_core_pm_clks = num_core_pm_clks;
	memcpy(pd->core_pm_clks, core_pm_clks, pm_size);

	genpd = &pd->genpd;
	genpd->name = np->name;
	genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |
		       GENPD_FLAG_ACTIVE_WAKEUP;
	genpd->attach_dev = cpg_mssr_attach_dev;
	genpd->detach_dev = cpg_mssr_detach_dev;
	ret = pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
	if (ret)
		return ret;

	ret = devm_add_action_or_reset(dev, cpg_mssr_genpd_remove, genpd);
	if (ret)
		return ret;

	cpg_mssr_clk_domain = pd;

	return of_genpd_add_provider_simple(np, genpd);
}

#ifdef CONFIG_RESET_CONTROLLER

#define rcdev_to_priv(x)	container_of(x, struct cpg_mssr_priv, rcdev)

static int cpg_mssr_reset(struct reset_controller_dev *rcdev,
			  unsigned long id)
{
	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
	unsigned int reg = id / 32;
	unsigned int bit = id % 32;
	u32 bitmask = BIT(bit);

	dev_dbg(priv->dev, "reset %u%02u\n", reg, bit);

	/* Reset module */
	writel(bitmask, priv->base + priv->reset_regs[reg]);

	/* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
	udelay(35);

	/* Release module from reset state */
	writel(bitmask, priv->base + priv->reset_clear_regs[reg]);

	return 0;
}

static int cpg_mssr_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
	unsigned int reg = id / 32;
	unsigned int bit = id % 32;
	u32 bitmask = BIT(bit);

	dev_dbg(priv->dev, "assert %u%02u\n", reg, bit);

	writel(bitmask, priv->base + priv->reset_regs[reg]);
	return 0;
}

static int cpg_mssr_deassert(struct reset_controller_dev *rcdev,
			     unsigned long id)
{
	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
	unsigned int reg = id / 32;
	unsigned int bit = id % 32;
	u32 bitmask = BIT(bit);

	dev_dbg(priv->dev, "deassert %u%02u\n", reg, bit);

	writel(bitmask, priv->base + priv->reset_clear_regs[reg]);
	return 0;
}

static int cpg_mssr_status(struct reset_controller_dev *rcdev,
			   unsigned long id)
{
	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
	unsigned int reg = id / 32;
	unsigned int bit = id % 32;
	u32 bitmask = BIT(bit);

	return !!(readl(priv->base + priv->reset_regs[reg]) & bitmask);
}

static const struct reset_control_ops cpg_mssr_reset_ops = {
	.reset = cpg_mssr_reset,
	.assert = cpg_mssr_assert,
	.deassert = cpg_mssr_deassert,
	.status = cpg_mssr_status,
};

static int cpg_mssr_reset_xlate(struct reset_controller_dev *rcdev,
				const struct of_phandle_args *reset_spec)
{
	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
	unsigned int unpacked = reset_spec->args[0];
	unsigned int idx = MOD_CLK_PACK(unpacked);

	if (unpacked % 100 > 31 || idx >= rcdev->nr_resets) {
		dev_err(priv->dev, "Invalid reset index %u\n", unpacked);
		return -EINVAL;
	}

	return idx;
}

static int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
{
	priv->rcdev.ops = &cpg_mssr_reset_ops;
	priv->rcdev.of_node = priv->dev->of_node;
	priv->rcdev.of_reset_n_cells = 1;
	priv->rcdev.of_xlate = cpg_mssr_reset_xlate;
	priv->rcdev.nr_resets = priv->num_mod_clks;
	return devm_reset_controller_register(priv->dev, &priv->rcdev);
}

#else /* !CONFIG_RESET_CONTROLLER */
static inline int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
{
	return 0;
}
#endif /* !CONFIG_RESET_CONTROLLER */


static const struct of_device_id cpg_mssr_match[] = {
#ifdef CONFIG_CLK_R7S9210
	{
		.compatible = "renesas,r7s9210-cpg-mssr",
		.data = &r7s9210_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7742
	{
		.compatible = "renesas,r8a7742-cpg-mssr",
		.data = &r8a7742_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7743
	{
		.compatible = "renesas,r8a7743-cpg-mssr",
		.data = &r8a7743_cpg_mssr_info,
	},
	/* RZ/G1N is (almost) identical to RZ/G1M w.r.t. clocks. */
	{
		.compatible = "renesas,r8a7744-cpg-mssr",
		.data = &r8a7743_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7745
	{
		.compatible = "renesas,r8a7745-cpg-mssr",
		.data = &r8a7745_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77470
	{
		.compatible = "renesas,r8a77470-cpg-mssr",
		.data = &r8a77470_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A774A1
	{
		.compatible = "renesas,r8a774a1-cpg-mssr",
		.data = &r8a774a1_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A774B1
	{
		.compatible = "renesas,r8a774b1-cpg-mssr",
		.data = &r8a774b1_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A774C0
	{
		.compatible = "renesas,r8a774c0-cpg-mssr",
		.data = &r8a774c0_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A774E1
	{
		.compatible = "renesas,r8a774e1-cpg-mssr",
		.data = &r8a774e1_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7790
	{
		.compatible = "renesas,r8a7790-cpg-mssr",
		.data = &r8a7790_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7791
	{
		.compatible = "renesas,r8a7791-cpg-mssr",
		.data = &r8a7791_cpg_mssr_info,
	},
	/* R-Car M2-N is (almost) identical to R-Car M2-W w.r.t. clocks. */
	{
		.compatible = "renesas,r8a7793-cpg-mssr",
		.data = &r8a7791_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7792
	{
		.compatible = "renesas,r8a7792-cpg-mssr",
		.data = &r8a7792_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7794
	{
		.compatible = "renesas,r8a7794-cpg-mssr",
		.data = &r8a7794_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A7795
	{
		.compatible = "renesas,r8a7795-cpg-mssr",
		.data = &r8a7795_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77960
	{
		.compatible = "renesas,r8a7796-cpg-mssr",
		.data = &r8a7796_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77961
	{
		.compatible = "renesas,r8a77961-cpg-mssr",
		.data = &r8a7796_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77965
	{
		.compatible = "renesas,r8a77965-cpg-mssr",
		.data = &r8a77965_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77970
	{
		.compatible = "renesas,r8a77970-cpg-mssr",
		.data = &r8a77970_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77980
	{
		.compatible = "renesas,r8a77980-cpg-mssr",
		.data = &r8a77980_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77990
	{
		.compatible = "renesas,r8a77990-cpg-mssr",
		.data = &r8a77990_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A77995
	{
		.compatible = "renesas,r8a77995-cpg-mssr",
		.data = &r8a77995_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A779A0
	{
		.compatible = "renesas,r8a779a0-cpg-mssr",
		.data = &r8a779a0_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A779F0
	{
		.compatible = "renesas,r8a779f0-cpg-mssr",
		.data = &r8a779f0_cpg_mssr_info,
	},
#endif
#ifdef CONFIG_CLK_R8A779G0
	{
		.compatible = "renesas,r8a779g0-cpg-mssr",
		.data = &r8a779g0_cpg_mssr_info,
	},
#endif
	{ /* sentinel */ }
};

static void cpg_mssr_del_clk_provider(void *data)
{
	of_clk_del_provider(data);
}

#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM_PSCI_FW)
static int cpg_mssr_suspend_noirq(struct device *dev)
{
	struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
	unsigned int reg;

	/* This is the best we can do to check for the presence of PSCI */
	if (!psci_ops.cpu_suspend)
		return 0;

	/* Save module registers with bits under our control */
	for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
		if (priv->smstpcr_saved[reg].mask)
			priv->smstpcr_saved[reg].val =
				priv->reg_layout == CLK_REG_LAYOUT_RZ_A ?
				readb(priv->base + priv->control_regs[reg]) :
				readl(priv->base + priv->control_regs[reg]);
	}

	/* Save core clocks */
	raw_notifier_call_chain(&priv->notifiers, PM_EVENT_SUSPEND, NULL);

	return 0;
}

static int cpg_mssr_resume_noirq(struct device *dev)
{
	struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
	unsigned int reg, i;
	u32 mask, oldval, newval;

	/* This is the best we can do to check for the presence of PSCI */
	if (!psci_ops.cpu_suspend)
		return 0;

	/* Restore core clocks */
	raw_notifier_call_chain(&priv->notifiers, PM_EVENT_RESUME, NULL);

	/* Restore module clocks */
	for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
		mask = priv->smstpcr_saved[reg].mask;
		if (!mask)
			continue;

		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
			oldval = readb(priv->base + priv->control_regs[reg]);
		else
			oldval = readl(priv->base + priv->control_regs[reg]);
		newval = oldval & ~mask;
		newval |= priv->smstpcr_saved[reg].val & mask;
		if (newval == oldval)
			continue;

		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
			writeb(newval, priv->base + priv->control_regs[reg]);
			/* dummy read to ensure write has completed */
			readb(priv->base + priv->control_regs[reg]);
			barrier_data(priv->base + priv->control_regs[reg]);
			continue;
		} else
			writel(newval, priv->base + priv->control_regs[reg]);

		/* Wait until enabled clocks are really enabled */
		mask &= ~priv->smstpcr_saved[reg].val;
		if (!mask)
			continue;

		for (i = 1000; i > 0; --i) {
			oldval = readl(priv->base + priv->status_regs[reg]);
			if (!(oldval & mask))
				break;
			cpu_relax();
		}

		if (!i)
			dev_warn(dev, "Failed to enable %s%u[0x%x]\n",
				 priv->reg_layout == CLK_REG_LAYOUT_RZ_A ?
				 "STB" : "SMSTP", reg, oldval & mask);
	}

	return 0;
}

static const struct dev_pm_ops cpg_mssr_pm = {
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cpg_mssr_suspend_noirq,
				      cpg_mssr_resume_noirq)
};
#define DEV_PM_OPS	&cpg_mssr_pm
#else
#define DEV_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP && CONFIG_ARM_PSCI_FW */

static int __init cpg_mssr_common_init(struct device *dev,
				       struct device_node *np,
				       const struct cpg_mssr_info *info)
{
	struct cpg_mssr_priv *priv;
	unsigned int nclks, i;
	int error;

	if (info->init) {
		error = info->init(dev);
		if (error)
			return error;
	}

	nclks = info->num_total_core_clks + info->num_hw_mod_clks;
	priv = kzalloc(struct_size(priv, clks, nclks), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->np = np;
	priv->dev = dev;
	spin_lock_init(&priv->rmw_lock);

	priv->base = of_iomap(np, 0);
	if (!priv->base) {
		error = -ENOMEM;
		goto out_err;
	}

	cpg_mssr_priv = priv;
	priv->num_core_clks = info->num_total_core_clks;
	priv->num_mod_clks = info->num_hw_mod_clks;
	priv->last_dt_core_clk = info->last_dt_core_clk;
	RAW_INIT_NOTIFIER_HEAD(&priv->notifiers);
	priv->reg_layout = info->reg_layout;
	if (priv->reg_layout == CLK_REG_LAYOUT_RCAR_GEN2_AND_GEN3) {
		priv->status_regs = mstpsr;
		priv->control_regs = smstpcr;
		priv->reset_regs = srcr;
		priv->reset_clear_regs = srstclr;
	} else if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
		priv->control_regs = stbcr;
	} else if (priv->reg_layout == CLK_REG_LAYOUT_RCAR_GEN4) {
		priv->status_regs = mstpsr_for_gen4;
		priv->control_regs = mstpcr_for_gen4;
		priv->reset_regs = srcr_for_gen4;
		priv->reset_clear_regs = srstclr_for_gen4;
	} else {
		error = -EINVAL;
		goto out_err;
	}

	for (i = 0; i < nclks; i++)
		priv->clks[i] = ERR_PTR(-ENOENT);

	error = of_clk_add_provider(np, cpg_mssr_clk_src_twocell_get, priv);
	if (error)
		goto out_err;

	return 0;

out_err:
	if (priv->base)
		iounmap(priv->base);
	kfree(priv);

	return error;
}

void __init cpg_mssr_early_init(struct device_node *np,
				const struct cpg_mssr_info *info)
{
	int error;
	int i;

	error = cpg_mssr_common_init(NULL, np, info);
	if (error)
		return;

	for (i = 0; i < info->num_early_core_clks; i++)
		cpg_mssr_register_core_clk(&info->early_core_clks[i], info,
					   cpg_mssr_priv);

	for (i = 0; i < info->num_early_mod_clks; i++)
		cpg_mssr_register_mod_clk(&info->early_mod_clks[i], info,
					  cpg_mssr_priv);

}

static int __init cpg_mssr_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const struct cpg_mssr_info *info;
	struct cpg_mssr_priv *priv;
	unsigned int i;
	int error;

	info = of_device_get_match_data(dev);

	if (!cpg_mssr_priv) {
		error = cpg_mssr_common_init(dev, dev->of_node, info);
		if (error)
			return error;
	}

	priv = cpg_mssr_priv;
	priv->dev = dev;
	dev_set_drvdata(dev, priv);

	for (i = 0; i < info->num_core_clks; i++)
		cpg_mssr_register_core_clk(&info->core_clks[i], info, priv);

	for (i = 0; i < info->num_mod_clks; i++)
		cpg_mssr_register_mod_clk(&info->mod_clks[i], info, priv);

	error = devm_add_action_or_reset(dev,
					 cpg_mssr_del_clk_provider,
					 np);
	if (error)
		return error;

	error = cpg_mssr_add_clk_domain(dev, info->core_pm_clks,
					info->num_core_pm_clks);
	if (error)
		return error;

	/* Reset Controller not supported for Standby Control SoCs */
	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
		return 0;

	error = cpg_mssr_reset_controller_register(priv);
	if (error)
		return error;

	return 0;
}

static struct platform_driver cpg_mssr_driver = {
	.driver		= {
		.name	= "renesas-cpg-mssr",
		.of_match_table = cpg_mssr_match,
		.pm = DEV_PM_OPS,
	},
};

static int __init cpg_mssr_init(void)
{
	return platform_driver_probe(&cpg_mssr_driver, cpg_mssr_probe);
}

subsys_initcall(cpg_mssr_init);

void __init cpg_core_nullify_range(struct cpg_core_clk *core_clks,
				   unsigned int num_core_clks,
				   unsigned int first_clk,
				   unsigned int last_clk)
{
	unsigned int i;

	for (i = 0; i < num_core_clks; i++)
		if (core_clks[i].id >= first_clk &&
		    core_clks[i].id <= last_clk)
			core_clks[i].name = NULL;
}

void __init mssr_mod_nullify(struct mssr_mod_clk *mod_clks,
			     unsigned int num_mod_clks,
			     const unsigned int *clks, unsigned int n)
{
	unsigned int i, j;

	for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
		if (mod_clks[i].id == clks[j]) {
			mod_clks[i].name = NULL;
			j++;
		}
}

void __init mssr_mod_reparent(struct mssr_mod_clk *mod_clks,
			      unsigned int num_mod_clks,
			      const struct mssr_mod_reparent *clks,
			      unsigned int n)
{
	unsigned int i, j;

	for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
		if (mod_clks[i].id == clks[j].clk) {
			mod_clks[i].parent = clks[j].parent;
			j++;
		}
}

MODULE_DESCRIPTION("Renesas CPG/MSSR Driver");
MODULE_LICENSE("GPL v2");