summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/omap2/omapfb/dss/dss.c
blob: f0cac9e0eb944ed55f455881aeea7124d456701f (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
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
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
/*
 * linux/drivers/video/omap2/dss/dss.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * Some code and ideas taken from drivers/video/omap/ driver
 * by Imre Deak.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define DSS_SUBSYS_NAME "DSS"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/gfp.h>
#include <linux/sizes.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
#include <linux/component.h>
#include <linux/pinctrl/consumer.h>

#include <video/omapfb_dss.h>

#include "dss.h"
#include "dss_features.h"

#define DSS_SZ_REGS			SZ_512

struct dss_reg {
	u16 idx;
};

#define DSS_REG(idx)			((const struct dss_reg) { idx })

#define DSS_REVISION			DSS_REG(0x0000)
#define DSS_SYSCONFIG			DSS_REG(0x0010)
#define DSS_SYSSTATUS			DSS_REG(0x0014)
#define DSS_CONTROL			DSS_REG(0x0040)
#define DSS_SDI_CONTROL			DSS_REG(0x0044)
#define DSS_PLL_CONTROL			DSS_REG(0x0048)
#define DSS_SDI_STATUS			DSS_REG(0x005C)

#define REG_GET(idx, start, end) \
	FLD_GET(dss_read_reg(idx), start, end)

#define REG_FLD_MOD(idx, val, start, end) \
	dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))

struct dss_features {
	u8 fck_div_max;
	u8 dss_fck_multiplier;
	const char *parent_clk_name;
	const enum omap_display_type *ports;
	int num_ports;
	int (*dpi_select_source)(int port, enum omap_channel channel);
};

static struct {
	struct platform_device *pdev;
	void __iomem    *base;
	struct regmap	*syscon_pll_ctrl;
	u32		syscon_pll_ctrl_offset;

	struct clk	*parent_clk;
	struct clk	*dss_clk;
	unsigned long	dss_clk_rate;

	unsigned long	cache_req_pck;
	unsigned long	cache_prate;
	struct dispc_clock_info cache_dispc_cinfo;

	enum omap_dss_clk_source dsi_clk_source[MAX_NUM_DSI];
	enum omap_dss_clk_source dispc_clk_source;
	enum omap_dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];

	bool		ctx_valid;
	u32		ctx[DSS_SZ_REGS / sizeof(u32)];

	const struct dss_features *feat;

	struct dss_pll	*video1_pll;
	struct dss_pll	*video2_pll;
} dss;

static const char * const dss_generic_clk_source_names[] = {
	[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC]	= "DSI_PLL_HSDIV_DISPC",
	[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI]	= "DSI_PLL_HSDIV_DSI",
	[OMAP_DSS_CLK_SRC_FCK]			= "DSS_FCK",
	[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC]	= "DSI_PLL2_HSDIV_DISPC",
	[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI]	= "DSI_PLL2_HSDIV_DSI",
};

static bool dss_initialized;

bool omapdss_is_initialized(void)
{
	return dss_initialized;
}
EXPORT_SYMBOL(omapdss_is_initialized);

static inline void dss_write_reg(const struct dss_reg idx, u32 val)
{
	__raw_writel(val, dss.base + idx.idx);
}

static inline u32 dss_read_reg(const struct dss_reg idx)
{
	return __raw_readl(dss.base + idx.idx);
}

#define SR(reg) \
	dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
#define RR(reg) \
	dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])

static void dss_save_context(void)
{
	DSSDBG("dss_save_context\n");

	SR(CONTROL);

	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
			OMAP_DISPLAY_TYPE_SDI) {
		SR(SDI_CONTROL);
		SR(PLL_CONTROL);
	}

	dss.ctx_valid = true;

	DSSDBG("context saved\n");
}

static void dss_restore_context(void)
{
	DSSDBG("dss_restore_context\n");

	if (!dss.ctx_valid)
		return;

	RR(CONTROL);

	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
			OMAP_DISPLAY_TYPE_SDI) {
		RR(SDI_CONTROL);
		RR(PLL_CONTROL);
	}

	DSSDBG("context restored\n");
}

#undef SR
#undef RR

void dss_ctrl_pll_enable(enum dss_pll_id pll_id, bool enable)
{
	unsigned shift;
	unsigned val;

	if (!dss.syscon_pll_ctrl)
		return;

	val = !enable;

	switch (pll_id) {
	case DSS_PLL_VIDEO1:
		shift = 0;
		break;
	case DSS_PLL_VIDEO2:
		shift = 1;
		break;
	case DSS_PLL_HDMI:
		shift = 2;
		break;
	default:
		DSSERR("illegal DSS PLL ID %d\n", pll_id);
		return;
	}

	regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
		1 << shift, val << shift);
}

void dss_ctrl_pll_set_control_mux(enum dss_pll_id pll_id,
	enum omap_channel channel)
{
	unsigned shift, val;

	if (!dss.syscon_pll_ctrl)
		return;

	switch (channel) {
	case OMAP_DSS_CHANNEL_LCD:
		shift = 3;

		switch (pll_id) {
		case DSS_PLL_VIDEO1:
			val = 0; break;
		case DSS_PLL_HDMI:
			val = 1; break;
		default:
			DSSERR("error in PLL mux config for LCD\n");
			return;
		}

		break;
	case OMAP_DSS_CHANNEL_LCD2:
		shift = 5;

		switch (pll_id) {
		case DSS_PLL_VIDEO1:
			val = 0; break;
		case DSS_PLL_VIDEO2:
			val = 1; break;
		case DSS_PLL_HDMI:
			val = 2; break;
		default:
			DSSERR("error in PLL mux config for LCD2\n");
			return;
		}

		break;
	case OMAP_DSS_CHANNEL_LCD3:
		shift = 7;

		switch (pll_id) {
		case DSS_PLL_VIDEO1:
			val = 1; break;
		case DSS_PLL_VIDEO2:
			val = 0; break;
		case DSS_PLL_HDMI:
			val = 2; break;
		default:
			DSSERR("error in PLL mux config for LCD3\n");
			return;
		}

		break;
	default:
		DSSERR("error in PLL mux config\n");
		return;
	}

	regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
		0x3 << shift, val << shift);
}

void dss_sdi_init(int datapairs)
{
	u32 l;

	BUG_ON(datapairs > 3 || datapairs < 1);

	l = dss_read_reg(DSS_SDI_CONTROL);
	l = FLD_MOD(l, 0xf, 19, 15);		/* SDI_PDIV */
	l = FLD_MOD(l, datapairs-1, 3, 2);	/* SDI_PRSEL */
	l = FLD_MOD(l, 2, 1, 0);		/* SDI_BWSEL */
	dss_write_reg(DSS_SDI_CONTROL, l);

	l = dss_read_reg(DSS_PLL_CONTROL);
	l = FLD_MOD(l, 0x7, 25, 22);	/* SDI_PLL_FREQSEL */
	l = FLD_MOD(l, 0xb, 16, 11);	/* SDI_PLL_REGN */
	l = FLD_MOD(l, 0xb4, 10, 1);	/* SDI_PLL_REGM */
	dss_write_reg(DSS_PLL_CONTROL, l);
}

int dss_sdi_enable(void)
{
	unsigned long timeout;

	dispc_pck_free_enable(1);

	/* Reset SDI PLL */
	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
	udelay(1);	/* wait 2x PCLK */

	/* Lock SDI PLL */
	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */

	/* Waiting for PLL lock request to complete */
	timeout = jiffies + msecs_to_jiffies(500);
	while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
		if (time_after_eq(jiffies, timeout)) {
			DSSERR("PLL lock request timed out\n");
			goto err1;
		}
	}

	/* Clearing PLL_GO bit */
	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);

	/* Waiting for PLL to lock */
	timeout = jiffies + msecs_to_jiffies(500);
	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
		if (time_after_eq(jiffies, timeout)) {
			DSSERR("PLL lock timed out\n");
			goto err1;
		}
	}

	dispc_lcd_enable_signal(1);

	/* Waiting for SDI reset to complete */
	timeout = jiffies + msecs_to_jiffies(500);
	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
		if (time_after_eq(jiffies, timeout)) {
			DSSERR("SDI reset timed out\n");
			goto err2;
		}
	}

	return 0;

 err2:
	dispc_lcd_enable_signal(0);
 err1:
	/* Reset SDI PLL */
	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */

	dispc_pck_free_enable(0);

	return -ETIMEDOUT;
}

void dss_sdi_disable(void)
{
	dispc_lcd_enable_signal(0);

	dispc_pck_free_enable(0);

	/* Reset SDI PLL */
	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
}

const char *dss_get_generic_clk_source_name(enum omap_dss_clk_source clk_src)
{
	return dss_generic_clk_source_names[clk_src];
}

void dss_dump_clocks(struct seq_file *s)
{
	const char *fclk_name, *fclk_real_name;
	unsigned long fclk_rate;

	if (dss_runtime_get())
		return;

	seq_printf(s, "- DSS -\n");

	fclk_name = dss_get_generic_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
	fclk_real_name = dss_feat_get_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
	fclk_rate = clk_get_rate(dss.dss_clk);

	seq_printf(s, "%s (%s) = %lu\n",
			fclk_name, fclk_real_name,
			fclk_rate);

	dss_runtime_put();
}

static void dss_dump_regs(struct seq_file *s)
{
#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))

	if (dss_runtime_get())
		return;

	DUMPREG(DSS_REVISION);
	DUMPREG(DSS_SYSCONFIG);
	DUMPREG(DSS_SYSSTATUS);
	DUMPREG(DSS_CONTROL);

	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
			OMAP_DISPLAY_TYPE_SDI) {
		DUMPREG(DSS_SDI_CONTROL);
		DUMPREG(DSS_PLL_CONTROL);
		DUMPREG(DSS_SDI_STATUS);
	}

	dss_runtime_put();
#undef DUMPREG
}

static void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src)
{
	int b;
	u8 start, end;

	switch (clk_src) {
	case OMAP_DSS_CLK_SRC_FCK:
		b = 0;
		break;
	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
		b = 1;
		break;
	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
		b = 2;
		break;
	default:
		BUG();
		return;
	}

	dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);

	REG_FLD_MOD(DSS_CONTROL, b, start, end);	/* DISPC_CLK_SWITCH */

	dss.dispc_clk_source = clk_src;
}

void dss_select_dsi_clk_source(int dsi_module,
		enum omap_dss_clk_source clk_src)
{
	int b, pos;

	switch (clk_src) {
	case OMAP_DSS_CLK_SRC_FCK:
		b = 0;
		break;
	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI:
		BUG_ON(dsi_module != 0);
		b = 1;
		break;
	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI:
		BUG_ON(dsi_module != 1);
		b = 1;
		break;
	default:
		BUG();
		return;
	}

	pos = dsi_module == 0 ? 1 : 10;
	REG_FLD_MOD(DSS_CONTROL, b, pos, pos);	/* DSIx_CLK_SWITCH */

	dss.dsi_clk_source[dsi_module] = clk_src;
}

void dss_select_lcd_clk_source(enum omap_channel channel,
		enum omap_dss_clk_source clk_src)
{
	int b, ix, pos;

	if (!dss_has_feature(FEAT_LCD_CLK_SRC)) {
		dss_select_dispc_clk_source(clk_src);
		return;
	}

	switch (clk_src) {
	case OMAP_DSS_CLK_SRC_FCK:
		b = 0;
		break;
	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
		BUG_ON(channel != OMAP_DSS_CHANNEL_LCD);
		b = 1;
		break;
	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
		BUG_ON(channel != OMAP_DSS_CHANNEL_LCD2 &&
		       channel != OMAP_DSS_CHANNEL_LCD3);
		b = 1;
		break;
	default:
		BUG();
		return;
	}

	pos = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
	     (channel == OMAP_DSS_CHANNEL_LCD2 ? 12 : 19);
	REG_FLD_MOD(DSS_CONTROL, b, pos, pos);	/* LCDx_CLK_SWITCH */

	ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
	    (channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
	dss.lcd_clk_source[ix] = clk_src;
}

enum omap_dss_clk_source dss_get_dispc_clk_source(void)
{
	return dss.dispc_clk_source;
}

enum omap_dss_clk_source dss_get_dsi_clk_source(int dsi_module)
{
	return dss.dsi_clk_source[dsi_module];
}

enum omap_dss_clk_source dss_get_lcd_clk_source(enum omap_channel channel)
{
	if (dss_has_feature(FEAT_LCD_CLK_SRC)) {
		int ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
			(channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
		return dss.lcd_clk_source[ix];
	} else {
		/* LCD_CLK source is the same as DISPC_FCLK source for
		 * OMAP2 and OMAP3 */
		return dss.dispc_clk_source;
	}
}

bool dss_div_calc(unsigned long pck, unsigned long fck_min,
		dss_div_calc_func func, void *data)
{
	int fckd, fckd_start, fckd_stop;
	unsigned long fck;
	unsigned long fck_hw_max;
	unsigned long fckd_hw_max;
	unsigned long prate;
	unsigned m;

	fck_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);

	if (dss.parent_clk == NULL) {
		unsigned pckd;

		pckd = fck_hw_max / pck;

		fck = pck * pckd;

		fck = clk_round_rate(dss.dss_clk, fck);

		return func(fck, data);
	}

	fckd_hw_max = dss.feat->fck_div_max;

	m = dss.feat->dss_fck_multiplier;
	prate = clk_get_rate(dss.parent_clk);

	fck_min = fck_min ? fck_min : 1;

	fckd_start = min(prate * m / fck_min, fckd_hw_max);
	fckd_stop = max(DIV_ROUND_UP(prate * m, fck_hw_max), 1ul);

	for (fckd = fckd_start; fckd >= fckd_stop; --fckd) {
		fck = DIV_ROUND_UP(prate, fckd) * m;

		if (func(fck, data))
			return true;
	}

	return false;
}

int dss_set_fck_rate(unsigned long rate)
{
	int r;

	DSSDBG("set fck to %lu\n", rate);

	r = clk_set_rate(dss.dss_clk, rate);
	if (r)
		return r;

	dss.dss_clk_rate = clk_get_rate(dss.dss_clk);

	WARN_ONCE(dss.dss_clk_rate != rate,
			"clk rate mismatch: %lu != %lu", dss.dss_clk_rate,
			rate);

	return 0;
}

unsigned long dss_get_dispc_clk_rate(void)
{
	return dss.dss_clk_rate;
}

static int dss_setup_default_clock(void)
{
	unsigned long max_dss_fck, prate;
	unsigned long fck;
	unsigned fck_div;
	int r;

	max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);

	if (dss.parent_clk == NULL) {
		fck = clk_round_rate(dss.dss_clk, max_dss_fck);
	} else {
		prate = clk_get_rate(dss.parent_clk);

		fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
				max_dss_fck);
		fck = DIV_ROUND_UP(prate, fck_div) * dss.feat->dss_fck_multiplier;
	}

	r = dss_set_fck_rate(fck);
	if (r)
		return r;

	return 0;
}

void dss_set_venc_output(enum omap_dss_venc_type type)
{
	int l = 0;

	if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
		l = 0;
	else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
		l = 1;
	else
		BUG();

	/* venc out selection. 0 = comp, 1 = svideo */
	REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
}

void dss_set_dac_pwrdn_bgz(bool enable)
{
	REG_FLD_MOD(DSS_CONTROL, enable, 5, 5);	/* DAC Power-Down Control */
}

void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select src)
{
	enum omap_display_type dp;
	dp = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);

	/* Complain about invalid selections */
	WARN_ON((src == DSS_VENC_TV_CLK) && !(dp & OMAP_DISPLAY_TYPE_VENC));
	WARN_ON((src == DSS_HDMI_M_PCLK) && !(dp & OMAP_DISPLAY_TYPE_HDMI));

	/* Select only if we have options */
	if ((dp & OMAP_DISPLAY_TYPE_VENC) && (dp & OMAP_DISPLAY_TYPE_HDMI))
		REG_FLD_MOD(DSS_CONTROL, src, 15, 15);	/* VENC_HDMI_SWITCH */
}

enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void)
{
	enum omap_display_type displays;

	displays = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
	if ((displays & OMAP_DISPLAY_TYPE_HDMI) == 0)
		return DSS_VENC_TV_CLK;

	if ((displays & OMAP_DISPLAY_TYPE_VENC) == 0)
		return DSS_HDMI_M_PCLK;

	return REG_GET(DSS_CONTROL, 15, 15);
}

static int dss_dpi_select_source_omap2_omap3(int port, enum omap_channel channel)
{
	if (channel != OMAP_DSS_CHANNEL_LCD)
		return -EINVAL;

	return 0;
}

static int dss_dpi_select_source_omap4(int port, enum omap_channel channel)
{
	int val;

	switch (channel) {
	case OMAP_DSS_CHANNEL_LCD2:
		val = 0;
		break;
	case OMAP_DSS_CHANNEL_DIGIT:
		val = 1;
		break;
	default:
		return -EINVAL;
	}

	REG_FLD_MOD(DSS_CONTROL, val, 17, 17);

	return 0;
}

static int dss_dpi_select_source_omap5(int port, enum omap_channel channel)
{
	int val;

	switch (channel) {
	case OMAP_DSS_CHANNEL_LCD:
		val = 1;
		break;
	case OMAP_DSS_CHANNEL_LCD2:
		val = 2;
		break;
	case OMAP_DSS_CHANNEL_LCD3:
		val = 3;
		break;
	case OMAP_DSS_CHANNEL_DIGIT:
		val = 0;
		break;
	default:
		return -EINVAL;
	}

	REG_FLD_MOD(DSS_CONTROL, val, 17, 16);

	return 0;
}

static int dss_dpi_select_source_dra7xx(int port, enum omap_channel channel)
{
	switch (port) {
	case 0:
		return dss_dpi_select_source_omap5(port, channel);
	case 1:
		if (channel != OMAP_DSS_CHANNEL_LCD2)
			return -EINVAL;
		break;
	case 2:
		if (channel != OMAP_DSS_CHANNEL_LCD3)
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

int dss_dpi_select_source(int port, enum omap_channel channel)
{
	return dss.feat->dpi_select_source(port, channel);
}

static int dss_get_clocks(void)
{
	struct clk *clk;

	clk = devm_clk_get(&dss.pdev->dev, "fck");
	if (IS_ERR(clk)) {
		DSSERR("can't get clock fck\n");
		return PTR_ERR(clk);
	}

	dss.dss_clk = clk;

	if (dss.feat->parent_clk_name) {
		clk = clk_get(NULL, dss.feat->parent_clk_name);
		if (IS_ERR(clk)) {
			DSSERR("Failed to get %s\n", dss.feat->parent_clk_name);
			return PTR_ERR(clk);
		}
	} else {
		clk = NULL;
	}

	dss.parent_clk = clk;

	return 0;
}

static void dss_put_clocks(void)
{
	if (dss.parent_clk)
		clk_put(dss.parent_clk);
}

int dss_runtime_get(void)
{
	int r;

	DSSDBG("dss_runtime_get\n");

	r = pm_runtime_get_sync(&dss.pdev->dev);
	WARN_ON(r < 0);
	return r < 0 ? r : 0;
}

void dss_runtime_put(void)
{
	int r;

	DSSDBG("dss_runtime_put\n");

	r = pm_runtime_put_sync(&dss.pdev->dev);
	WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY);
}

/* DEBUGFS */
#if defined(CONFIG_FB_OMAP2_DSS_DEBUGFS)
void dss_debug_dump_clocks(struct seq_file *s)
{
	dss_dump_clocks(s);
	dispc_dump_clocks(s);
#ifdef CONFIG_FB_OMAP2_DSS_DSI
	dsi_dump_clocks(s);
#endif
}
#endif


static const enum omap_display_type omap2plus_ports[] = {
	OMAP_DISPLAY_TYPE_DPI,
};

static const enum omap_display_type omap34xx_ports[] = {
	OMAP_DISPLAY_TYPE_DPI,
	OMAP_DISPLAY_TYPE_SDI,
};

static const enum omap_display_type dra7xx_ports[] = {
	OMAP_DISPLAY_TYPE_DPI,
	OMAP_DISPLAY_TYPE_DPI,
	OMAP_DISPLAY_TYPE_DPI,
};

static const struct dss_features omap24xx_dss_feats = {
	/*
	 * fck div max is really 16, but the divider range has gaps. The range
	 * from 1 to 6 has no gaps, so let's use that as a max.
	 */
	.fck_div_max		=	6,
	.dss_fck_multiplier	=	2,
	.parent_clk_name	=	"core_ck",
	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
	.ports			=	omap2plus_ports,
	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
};

static const struct dss_features omap34xx_dss_feats = {
	.fck_div_max		=	16,
	.dss_fck_multiplier	=	2,
	.parent_clk_name	=	"dpll4_ck",
	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
	.ports			=	omap34xx_ports,
	.num_ports		=	ARRAY_SIZE(omap34xx_ports),
};

static const struct dss_features omap3630_dss_feats = {
	.fck_div_max		=	32,
	.dss_fck_multiplier	=	1,
	.parent_clk_name	=	"dpll4_ck",
	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
	.ports			=	omap2plus_ports,
	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
};

static const struct dss_features omap44xx_dss_feats = {
	.fck_div_max		=	32,
	.dss_fck_multiplier	=	1,
	.parent_clk_name	=	"dpll_per_x2_ck",
	.dpi_select_source	=	&dss_dpi_select_source_omap4,
	.ports			=	omap2plus_ports,
	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
};

static const struct dss_features omap54xx_dss_feats = {
	.fck_div_max		=	64,
	.dss_fck_multiplier	=	1,
	.parent_clk_name	=	"dpll_per_x2_ck",
	.dpi_select_source	=	&dss_dpi_select_source_omap5,
	.ports			=	omap2plus_ports,
	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
};

static const struct dss_features am43xx_dss_feats = {
	.fck_div_max		=	0,
	.dss_fck_multiplier	=	0,
	.parent_clk_name	=	NULL,
	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
	.ports			=	omap2plus_ports,
	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
};

static const struct dss_features dra7xx_dss_feats = {
	.fck_div_max		=	64,
	.dss_fck_multiplier	=	1,
	.parent_clk_name	=	"dpll_per_x2_ck",
	.dpi_select_source	=	&dss_dpi_select_source_dra7xx,
	.ports			=	dra7xx_ports,
	.num_ports		=	ARRAY_SIZE(dra7xx_ports),
};

static const struct dss_features *dss_get_features(void)
{
	switch (omapdss_get_version()) {
	case OMAPDSS_VER_OMAP24xx:
		return &omap24xx_dss_feats;

	case OMAPDSS_VER_OMAP34xx_ES1:
	case OMAPDSS_VER_OMAP34xx_ES3:
	case OMAPDSS_VER_AM35xx:
		return &omap34xx_dss_feats;

	case OMAPDSS_VER_OMAP3630:
		return &omap3630_dss_feats;

	case OMAPDSS_VER_OMAP4430_ES1:
	case OMAPDSS_VER_OMAP4430_ES2:
	case OMAPDSS_VER_OMAP4:
		return &omap44xx_dss_feats;

	case OMAPDSS_VER_OMAP5:
		return &omap54xx_dss_feats;

	case OMAPDSS_VER_AM43xx:
		return &am43xx_dss_feats;

	case OMAPDSS_VER_DRA7xx:
		return &dra7xx_dss_feats;

	default:
		return NULL;
	}
}

static void dss_uninit_ports(struct platform_device *pdev);

static int dss_init_ports(struct platform_device *pdev)
{
	struct device_node *parent = pdev->dev.of_node;
	struct device_node *port;
	int r, ret = 0;

	if (parent == NULL)
		return 0;

	port = omapdss_of_get_next_port(parent, NULL);
	if (!port)
		return 0;

	if (dss.feat->num_ports == 0)
		return 0;

	do {
		enum omap_display_type port_type;
		u32 reg;

		r = of_property_read_u32(port, "reg", &reg);
		if (r)
			reg = 0;

		if (reg >= dss.feat->num_ports)
			continue;

		port_type = dss.feat->ports[reg];

		switch (port_type) {
		case OMAP_DISPLAY_TYPE_DPI:
			ret = dpi_init_port(pdev, port);
			break;
		case OMAP_DISPLAY_TYPE_SDI:
			ret = sdi_init_port(pdev, port);
			break;
		default:
			break;
		}
	} while (!ret &&
		 (port = omapdss_of_get_next_port(parent, port)) != NULL);

	if (ret)
		dss_uninit_ports(pdev);

	return ret;
}

static void dss_uninit_ports(struct platform_device *pdev)
{
	struct device_node *parent = pdev->dev.of_node;
	struct device_node *port;

	if (parent == NULL)
		return;

	port = omapdss_of_get_next_port(parent, NULL);
	if (!port)
		return;

	if (dss.feat->num_ports == 0)
		return;

	do {
		enum omap_display_type port_type;
		u32 reg;
		int r;

		r = of_property_read_u32(port, "reg", &reg);
		if (r)
			reg = 0;

		if (reg >= dss.feat->num_ports)
			continue;

		port_type = dss.feat->ports[reg];

		switch (port_type) {
		case OMAP_DISPLAY_TYPE_DPI:
			dpi_uninit_port(port);
			break;
		case OMAP_DISPLAY_TYPE_SDI:
			sdi_uninit_port(port);
			break;
		default:
			break;
		}
	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
}

static int dss_video_pll_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct regulator *pll_regulator;
	int r;

	if (!np)
		return 0;

	if (of_property_read_bool(np, "syscon-pll-ctrl")) {
		dss.syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
			"syscon-pll-ctrl");
		if (IS_ERR(dss.syscon_pll_ctrl)) {
			dev_err(&pdev->dev,
				"failed to get syscon-pll-ctrl regmap\n");
			return PTR_ERR(dss.syscon_pll_ctrl);
		}

		if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
				&dss.syscon_pll_ctrl_offset)) {
			dev_err(&pdev->dev,
				"failed to get syscon-pll-ctrl offset\n");
			return -EINVAL;
		}
	}

	pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
	if (IS_ERR(pll_regulator)) {
		r = PTR_ERR(pll_regulator);

		switch (r) {
		case -ENOENT:
			pll_regulator = NULL;
			break;

		case -EPROBE_DEFER:
			return -EPROBE_DEFER;

		default:
			DSSERR("can't get DPLL VDDA regulator\n");
			return r;
		}
	}

	if (of_property_match_string(np, "reg-names", "pll1") >= 0) {
		dss.video1_pll = dss_video_pll_init(pdev, 0, pll_regulator);
		if (IS_ERR(dss.video1_pll))
			return PTR_ERR(dss.video1_pll);
	}

	if (of_property_match_string(np, "reg-names", "pll2") >= 0) {
		dss.video2_pll = dss_video_pll_init(pdev, 1, pll_regulator);
		if (IS_ERR(dss.video2_pll)) {
			dss_video_pll_uninit(dss.video1_pll);
			return PTR_ERR(dss.video2_pll);
		}
	}

	return 0;
}

/* DSS HW IP initialisation */
static int dss_bind(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct resource *dss_mem;
	u32 rev;
	int r;

	dss.pdev = pdev;

	dss.feat = dss_get_features();
	if (!dss.feat)
		return -ENODEV;

	dss_mem = platform_get_resource(dss.pdev, IORESOURCE_MEM, 0);
	if (!dss_mem) {
		DSSERR("can't get IORESOURCE_MEM DSS\n");
		return -EINVAL;
	}

	dss.base = devm_ioremap(&pdev->dev, dss_mem->start,
				resource_size(dss_mem));
	if (!dss.base) {
		DSSERR("can't ioremap DSS\n");
		return -ENOMEM;
	}

	r = dss_get_clocks();
	if (r)
		return r;

	r = dss_setup_default_clock();
	if (r)
		goto err_setup_clocks;

	r = dss_video_pll_probe(pdev);
	if (r)
		goto err_pll_init;

	r = dss_init_ports(pdev);
	if (r)
		goto err_init_ports;

	pm_runtime_enable(&pdev->dev);

	r = dss_runtime_get();
	if (r)
		goto err_runtime_get;

	dss.dss_clk_rate = clk_get_rate(dss.dss_clk);

	/* Select DPLL */
	REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);

	dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);

#ifdef CONFIG_FB_OMAP2_DSS_VENC
	REG_FLD_MOD(DSS_CONTROL, 1, 4, 4);	/* venc dac demen */
	REG_FLD_MOD(DSS_CONTROL, 1, 3, 3);	/* venc clock 4x enable */
	REG_FLD_MOD(DSS_CONTROL, 0, 2, 2);	/* venc clock mode = normal */
#endif
	dss.dsi_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
	dss.dsi_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
	dss.dispc_clk_source = OMAP_DSS_CLK_SRC_FCK;
	dss.lcd_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
	dss.lcd_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;

	rev = dss_read_reg(DSS_REVISION);
	printk(KERN_INFO "OMAP DSS rev %d.%d\n",
			FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));

	dss_runtime_put();

	r = component_bind_all(&pdev->dev, NULL);
	if (r)
		goto err_component;

	dss_debugfs_create_file("dss", dss_dump_regs);

	pm_set_vt_switch(0);

	dss_initialized = true;

	return 0;

err_component:
err_runtime_get:
	pm_runtime_disable(&pdev->dev);
	dss_uninit_ports(pdev);
err_init_ports:
	if (dss.video1_pll)
		dss_video_pll_uninit(dss.video1_pll);

	if (dss.video2_pll)
		dss_video_pll_uninit(dss.video2_pll);
err_pll_init:
err_setup_clocks:
	dss_put_clocks();
	return r;
}

static void dss_unbind(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);

	dss_initialized = false;

	component_unbind_all(&pdev->dev, NULL);

	if (dss.video1_pll)
		dss_video_pll_uninit(dss.video1_pll);

	if (dss.video2_pll)
		dss_video_pll_uninit(dss.video2_pll);

	dss_uninit_ports(pdev);

	pm_runtime_disable(&pdev->dev);

	dss_put_clocks();
}

static const struct component_master_ops dss_component_ops = {
	.bind = dss_bind,
	.unbind = dss_unbind,
};

static int dss_component_compare(struct device *dev, void *data)
{
	struct device *child = data;
	return dev == child;
}

static int dss_add_child_component(struct device *dev, void *data)
{
	struct component_match **match = data;

	/*
	 * HACK
	 * We don't have a working driver for rfbi, so skip it here always.
	 * Otherwise dss will never get probed successfully, as it will wait
	 * for rfbi to get probed.
	 */
	if (strstr(dev_name(dev), "rfbi"))
		return 0;

	component_match_add(dev->parent, match, dss_component_compare, dev);

	return 0;
}

static int dss_probe(struct platform_device *pdev)
{
	struct component_match *match = NULL;
	int r;

	/* add all the child devices as components */
	device_for_each_child(&pdev->dev, &match, dss_add_child_component);

	r = component_master_add_with_match(&pdev->dev, &dss_component_ops, match);
	if (r)
		return r;

	return 0;
}

static int dss_remove(struct platform_device *pdev)
{
	component_master_del(&pdev->dev, &dss_component_ops);
	return 0;
}

static int dss_runtime_suspend(struct device *dev)
{
	dss_save_context();
	dss_set_min_bus_tput(dev, 0);

	pinctrl_pm_select_sleep_state(dev);

	return 0;
}

static int dss_runtime_resume(struct device *dev)
{
	int r;

	pinctrl_pm_select_default_state(dev);

	/*
	 * Set an arbitrarily high tput request to ensure OPP100.
	 * What we should really do is to make a request to stay in OPP100,
	 * without any tput requirements, but that is not currently possible
	 * via the PM layer.
	 */

	r = dss_set_min_bus_tput(dev, 1000000000);
	if (r)
		return r;

	dss_restore_context();
	return 0;
}

static const struct dev_pm_ops dss_pm_ops = {
	.runtime_suspend = dss_runtime_suspend,
	.runtime_resume = dss_runtime_resume,
};

static const struct of_device_id dss_of_match[] = {
	{ .compatible = "ti,omap2-dss", },
	{ .compatible = "ti,omap3-dss", },
	{ .compatible = "ti,omap4-dss", },
	{ .compatible = "ti,omap5-dss", },
	{ .compatible = "ti,dra7-dss", },
	{},
};

MODULE_DEVICE_TABLE(of, dss_of_match);

static struct platform_driver omap_dsshw_driver = {
	.probe		= dss_probe,
	.remove		= dss_remove,
	.driver         = {
		.name   = "omapdss_dss",
		.pm	= &dss_pm_ops,
		.of_match_table = dss_of_match,
		.suppress_bind_attrs = true,
	},
};

int __init dss_init_platform_driver(void)
{
	return platform_driver_register(&omap_dsshw_driver);
}

void dss_uninit_platform_driver(void)
{
	platform_driver_unregister(&omap_dsshw_driver);
}