summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/omap3isp/ispcsi2.c
blob: 6db245d84bbbe5f8e27bc9fb1555e2bdf0f20d0d (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
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
/*
 * ispcsi2.c
 *
 * TI OMAP3 ISP - CSI2 module
 *
 * Copyright (C) 2010 Nokia Corporation
 * Copyright (C) 2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	     Sakari Ailus <sakari.ailus@iki.fi>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */
#include <linux/delay.h>
#include <media/v4l2-common.h>
#include <linux/v4l2-mediabus.h>
#include <linux/mm.h>

#include "isp.h"
#include "ispreg.h"
#include "ispcsi2.h"

/*
 * csi2_if_enable - Enable CSI2 Receiver interface.
 * @enable: enable flag
 *
 */
static void csi2_if_enable(struct isp_device *isp,
			   struct isp_csi2_device *csi2, u8 enable)
{
	struct isp_csi2_ctrl_cfg *currctrl = &csi2->ctrl;

	isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_CTRL, ISPCSI2_CTRL_IF_EN,
			enable ? ISPCSI2_CTRL_IF_EN : 0);

	currctrl->if_enable = enable;
}

/*
 * csi2_recv_config - CSI2 receiver module configuration.
 * @currctrl: isp_csi2_ctrl_cfg structure
 *
 */
static void csi2_recv_config(struct isp_device *isp,
			     struct isp_csi2_device *csi2,
			     struct isp_csi2_ctrl_cfg *currctrl)
{
	u32 reg;

	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTRL);

	if (currctrl->frame_mode)
		reg |= ISPCSI2_CTRL_FRAME;
	else
		reg &= ~ISPCSI2_CTRL_FRAME;

	if (currctrl->vp_clk_enable)
		reg |= ISPCSI2_CTRL_VP_CLK_EN;
	else
		reg &= ~ISPCSI2_CTRL_VP_CLK_EN;

	if (currctrl->vp_only_enable)
		reg |= ISPCSI2_CTRL_VP_ONLY_EN;
	else
		reg &= ~ISPCSI2_CTRL_VP_ONLY_EN;

	reg &= ~ISPCSI2_CTRL_VP_OUT_CTRL_MASK;
	reg |= currctrl->vp_out_ctrl << ISPCSI2_CTRL_VP_OUT_CTRL_SHIFT;

	if (currctrl->ecc_enable)
		reg |= ISPCSI2_CTRL_ECC_EN;
	else
		reg &= ~ISPCSI2_CTRL_ECC_EN;

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTRL);
}

static const unsigned int csi2_input_fmts[] = {
	V4L2_MBUS_FMT_SGRBG10_1X10,
	V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8,
	V4L2_MBUS_FMT_SRGGB10_1X10,
	V4L2_MBUS_FMT_SRGGB10_DPCM8_1X8,
	V4L2_MBUS_FMT_SBGGR10_1X10,
	V4L2_MBUS_FMT_SBGGR10_DPCM8_1X8,
	V4L2_MBUS_FMT_SGBRG10_1X10,
	V4L2_MBUS_FMT_SGBRG10_DPCM8_1X8,
	V4L2_MBUS_FMT_YUYV8_2X8,
};

/* To set the format on the CSI2 requires a mapping function that takes
 * the following inputs:
 * - 3 different formats (at this time)
 * - 2 destinations (mem, vp+mem) (vp only handled separately)
 * - 2 decompression options (on, off)
 * - 2 isp revisions (certain format must be handled differently on OMAP3630)
 * Output should be CSI2 frame format code
 * Array indices as follows: [format][dest][decompr][is_3630]
 * Not all combinations are valid. 0 means invalid.
 */
static const u16 __csi2_fmt_map[3][2][2][2] = {
	/* RAW10 formats */
	{
		/* Output to memory */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_RAW10_EXP16, CSI2_PIX_FMT_RAW10_EXP16 },
			/* DPCM decompression */
			{ 0, 0 },
		},
		/* Output to both */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_RAW10_EXP16_VP,
			  CSI2_PIX_FMT_RAW10_EXP16_VP },
			/* DPCM decompression */
			{ 0, 0 },
		},
	},
	/* RAW10 DPCM8 formats */
	{
		/* Output to memory */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_RAW8, CSI2_USERDEF_8BIT_DATA1 },
			/* DPCM decompression */
			{ CSI2_PIX_FMT_RAW8_DPCM10_EXP16,
			  CSI2_USERDEF_8BIT_DATA1_DPCM10 },
		},
		/* Output to both */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_RAW8_VP,
			  CSI2_PIX_FMT_RAW8_VP },
			/* DPCM decompression */
			{ CSI2_PIX_FMT_RAW8_DPCM10_VP,
			  CSI2_USERDEF_8BIT_DATA1_DPCM10_VP },
		},
	},
	/* YUYV8 2X8 formats */
	{
		/* Output to memory */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_YUV422_8BIT,
			  CSI2_PIX_FMT_YUV422_8BIT },
			/* DPCM decompression */
			{ 0, 0 },
		},
		/* Output to both */
		{
			/* No DPCM decompression */
			{ CSI2_PIX_FMT_YUV422_8BIT_VP,
			  CSI2_PIX_FMT_YUV422_8BIT_VP },
			/* DPCM decompression */
			{ 0, 0 },
		},
	},
};

/*
 * csi2_ctx_map_format - Map CSI2 sink media bus format to CSI2 format ID
 * @csi2: ISP CSI2 device
 *
 * Returns CSI2 physical format id
 */
static u16 csi2_ctx_map_format(struct isp_csi2_device *csi2)
{
	const struct v4l2_mbus_framefmt *fmt = &csi2->formats[CSI2_PAD_SINK];
	int fmtidx, destidx, is_3630;

	switch (fmt->code) {
	case V4L2_MBUS_FMT_SGRBG10_1X10:
	case V4L2_MBUS_FMT_SRGGB10_1X10:
	case V4L2_MBUS_FMT_SBGGR10_1X10:
	case V4L2_MBUS_FMT_SGBRG10_1X10:
		fmtidx = 0;
		break;
	case V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8:
	case V4L2_MBUS_FMT_SRGGB10_DPCM8_1X8:
	case V4L2_MBUS_FMT_SBGGR10_DPCM8_1X8:
	case V4L2_MBUS_FMT_SGBRG10_DPCM8_1X8:
		fmtidx = 1;
		break;
	case V4L2_MBUS_FMT_YUYV8_2X8:
		fmtidx = 2;
		break;
	default:
		WARN(1, KERN_ERR "CSI2: pixel format %08x unsupported!\n",
		     fmt->code);
		return 0;
	}

	if (!(csi2->output & CSI2_OUTPUT_CCDC) &&
	    !(csi2->output & CSI2_OUTPUT_MEMORY)) {
		/* Neither output enabled is a valid combination */
		return CSI2_PIX_FMT_OTHERS;
	}

	/* If we need to skip frames at the beginning of the stream disable the
	 * video port to avoid sending the skipped frames to the CCDC.
	 */
	destidx = csi2->frame_skip ? 0 : !!(csi2->output & CSI2_OUTPUT_CCDC);
	is_3630 = csi2->isp->revision == ISP_REVISION_15_0;

	return __csi2_fmt_map[fmtidx][destidx][csi2->dpcm_decompress][is_3630];
}

/*
 * csi2_set_outaddr - Set memory address to save output image
 * @csi2: Pointer to ISP CSI2a device.
 * @addr: ISP MMU Mapped 32-bit memory address aligned on 32 byte boundary.
 *
 * Sets the memory address where the output will be saved.
 *
 * Returns 0 if successful, or -EINVAL if the address is not in the 32 byte
 * boundary.
 */
static void csi2_set_outaddr(struct isp_csi2_device *csi2, u32 addr)
{
	struct isp_device *isp = csi2->isp;
	struct isp_csi2_ctx_cfg *ctx = &csi2->contexts[0];

	ctx->ping_addr = addr;
	ctx->pong_addr = addr;
	isp_reg_writel(isp, ctx->ping_addr,
		       csi2->regs1, ISPCSI2_CTX_DAT_PING_ADDR(ctx->ctxnum));
	isp_reg_writel(isp, ctx->pong_addr,
		       csi2->regs1, ISPCSI2_CTX_DAT_PONG_ADDR(ctx->ctxnum));
}

/*
 * is_usr_def_mapping - Checks whether USER_DEF_MAPPING should
 *			be enabled by CSI2.
 * @format_id: mapped format id
 *
 */
static inline int is_usr_def_mapping(u32 format_id)
{
	return (format_id & 0x40) ? 1 : 0;
}

/*
 * csi2_ctx_enable - Enable specified CSI2 context
 * @ctxnum: Context number, valid between 0 and 7 values.
 * @enable: enable
 *
 */
static void csi2_ctx_enable(struct isp_device *isp,
			    struct isp_csi2_device *csi2, u8 ctxnum, u8 enable)
{
	struct isp_csi2_ctx_cfg *ctx = &csi2->contexts[ctxnum];
	unsigned int skip = 0;
	u32 reg;

	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL1(ctxnum));

	if (enable) {
		if (csi2->frame_skip)
			skip = csi2->frame_skip;
		else if (csi2->output & CSI2_OUTPUT_MEMORY)
			skip = 1;

		reg &= ~ISPCSI2_CTX_CTRL1_COUNT_MASK;
		reg |= ISPCSI2_CTX_CTRL1_COUNT_UNLOCK
		    |  (skip << ISPCSI2_CTX_CTRL1_COUNT_SHIFT)
		    |  ISPCSI2_CTX_CTRL1_CTX_EN;
	} else {
		reg &= ~ISPCSI2_CTX_CTRL1_CTX_EN;
	}

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL1(ctxnum));
	ctx->enabled = enable;
}

/*
 * csi2_ctx_config - CSI2 context configuration.
 * @ctx: context configuration
 *
 */
static void csi2_ctx_config(struct isp_device *isp,
			    struct isp_csi2_device *csi2,
			    struct isp_csi2_ctx_cfg *ctx)
{
	u32 reg;

	/* Set up CSI2_CTx_CTRL1 */
	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL1(ctx->ctxnum));

	if (ctx->eof_enabled)
		reg |= ISPCSI2_CTX_CTRL1_EOF_EN;
	else
		reg &= ~ISPCSI2_CTX_CTRL1_EOF_EN;

	if (ctx->eol_enabled)
		reg |= ISPCSI2_CTX_CTRL1_EOL_EN;
	else
		reg &= ~ISPCSI2_CTX_CTRL1_EOL_EN;

	if (ctx->checksum_enabled)
		reg |= ISPCSI2_CTX_CTRL1_CS_EN;
	else
		reg &= ~ISPCSI2_CTX_CTRL1_CS_EN;

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL1(ctx->ctxnum));

	/* Set up CSI2_CTx_CTRL2 */
	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL2(ctx->ctxnum));

	reg &= ~(ISPCSI2_CTX_CTRL2_VIRTUAL_ID_MASK);
	reg |= ctx->virtual_id << ISPCSI2_CTX_CTRL2_VIRTUAL_ID_SHIFT;

	reg &= ~(ISPCSI2_CTX_CTRL2_FORMAT_MASK);
	reg |= ctx->format_id << ISPCSI2_CTX_CTRL2_FORMAT_SHIFT;

	if (ctx->dpcm_decompress) {
		if (ctx->dpcm_predictor)
			reg |= ISPCSI2_CTX_CTRL2_DPCM_PRED;
		else
			reg &= ~ISPCSI2_CTX_CTRL2_DPCM_PRED;
	}

	if (is_usr_def_mapping(ctx->format_id)) {
		reg &= ~ISPCSI2_CTX_CTRL2_USER_DEF_MAP_MASK;
		reg |= 2 << ISPCSI2_CTX_CTRL2_USER_DEF_MAP_SHIFT;
	}

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL2(ctx->ctxnum));

	/* Set up CSI2_CTx_CTRL3 */
	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL3(ctx->ctxnum));
	reg &= ~(ISPCSI2_CTX_CTRL3_ALPHA_MASK);
	reg |= (ctx->alpha << ISPCSI2_CTX_CTRL3_ALPHA_SHIFT);

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL3(ctx->ctxnum));

	/* Set up CSI2_CTx_DAT_OFST */
	reg = isp_reg_readl(isp, csi2->regs1,
			    ISPCSI2_CTX_DAT_OFST(ctx->ctxnum));
	reg &= ~ISPCSI2_CTX_DAT_OFST_OFST_MASK;
	reg |= ctx->data_offset << ISPCSI2_CTX_DAT_OFST_OFST_SHIFT;
	isp_reg_writel(isp, reg, csi2->regs1,
		       ISPCSI2_CTX_DAT_OFST(ctx->ctxnum));

	isp_reg_writel(isp, ctx->ping_addr,
		       csi2->regs1, ISPCSI2_CTX_DAT_PING_ADDR(ctx->ctxnum));

	isp_reg_writel(isp, ctx->pong_addr,
		       csi2->regs1, ISPCSI2_CTX_DAT_PONG_ADDR(ctx->ctxnum));
}

/*
 * csi2_timing_config - CSI2 timing configuration.
 * @timing: csi2_timing_cfg structure
 */
static void csi2_timing_config(struct isp_device *isp,
			       struct isp_csi2_device *csi2,
			       struct isp_csi2_timing_cfg *timing)
{
	u32 reg;

	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_TIMING);

	if (timing->force_rx_mode)
		reg |= ISPCSI2_TIMING_FORCE_RX_MODE_IO(timing->ionum);
	else
		reg &= ~ISPCSI2_TIMING_FORCE_RX_MODE_IO(timing->ionum);

	if (timing->stop_state_16x)
		reg |= ISPCSI2_TIMING_STOP_STATE_X16_IO(timing->ionum);
	else
		reg &= ~ISPCSI2_TIMING_STOP_STATE_X16_IO(timing->ionum);

	if (timing->stop_state_4x)
		reg |= ISPCSI2_TIMING_STOP_STATE_X4_IO(timing->ionum);
	else
		reg &= ~ISPCSI2_TIMING_STOP_STATE_X4_IO(timing->ionum);

	reg &= ~ISPCSI2_TIMING_STOP_STATE_COUNTER_IO_MASK(timing->ionum);
	reg |= timing->stop_state_counter <<
	       ISPCSI2_TIMING_STOP_STATE_COUNTER_IO_SHIFT(timing->ionum);

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_TIMING);
}

/*
 * csi2_irq_ctx_set - Enables CSI2 Context IRQs.
 * @enable: Enable/disable CSI2 Context interrupts
 */
static void csi2_irq_ctx_set(struct isp_device *isp,
			     struct isp_csi2_device *csi2, int enable)
{
	int i;

	for (i = 0; i < 8; i++) {
		isp_reg_writel(isp, ISPCSI2_CTX_IRQSTATUS_FE_IRQ, csi2->regs1,
			       ISPCSI2_CTX_IRQSTATUS(i));
		if (enable)
			isp_reg_set(isp, csi2->regs1, ISPCSI2_CTX_IRQENABLE(i),
				    ISPCSI2_CTX_IRQSTATUS_FE_IRQ);
		else
			isp_reg_clr(isp, csi2->regs1, ISPCSI2_CTX_IRQENABLE(i),
				    ISPCSI2_CTX_IRQSTATUS_FE_IRQ);
	}
}

/*
 * csi2_irq_complexio1_set - Enables CSI2 ComplexIO IRQs.
 * @enable: Enable/disable CSI2 ComplexIO #1 interrupts
 */
static void csi2_irq_complexio1_set(struct isp_device *isp,
				    struct isp_csi2_device *csi2, int enable)
{
	u32 reg;
	reg = ISPCSI2_PHY_IRQENABLE_STATEALLULPMEXIT |
		ISPCSI2_PHY_IRQENABLE_STATEALLULPMENTER |
		ISPCSI2_PHY_IRQENABLE_STATEULPM5 |
		ISPCSI2_PHY_IRQENABLE_ERRCONTROL5 |
		ISPCSI2_PHY_IRQENABLE_ERRESC5 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS5 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTHS5 |
		ISPCSI2_PHY_IRQENABLE_STATEULPM4 |
		ISPCSI2_PHY_IRQENABLE_ERRCONTROL4 |
		ISPCSI2_PHY_IRQENABLE_ERRESC4 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS4 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTHS4 |
		ISPCSI2_PHY_IRQENABLE_STATEULPM3 |
		ISPCSI2_PHY_IRQENABLE_ERRCONTROL3 |
		ISPCSI2_PHY_IRQENABLE_ERRESC3 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS3 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTHS3 |
		ISPCSI2_PHY_IRQENABLE_STATEULPM2 |
		ISPCSI2_PHY_IRQENABLE_ERRCONTROL2 |
		ISPCSI2_PHY_IRQENABLE_ERRESC2 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS2 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTHS2 |
		ISPCSI2_PHY_IRQENABLE_STATEULPM1 |
		ISPCSI2_PHY_IRQENABLE_ERRCONTROL1 |
		ISPCSI2_PHY_IRQENABLE_ERRESC1 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS1 |
		ISPCSI2_PHY_IRQENABLE_ERRSOTHS1;
	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_PHY_IRQSTATUS);
	if (enable)
		reg |= isp_reg_readl(isp, csi2->regs1, ISPCSI2_PHY_IRQENABLE);
	else
		reg = 0;
	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_PHY_IRQENABLE);
}

/*
 * csi2_irq_status_set - Enables CSI2 Status IRQs.
 * @enable: Enable/disable CSI2 Status interrupts
 */
static void csi2_irq_status_set(struct isp_device *isp,
				struct isp_csi2_device *csi2, int enable)
{
	u32 reg;
	reg = ISPCSI2_IRQSTATUS_OCP_ERR_IRQ |
		ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ |
		ISPCSI2_IRQSTATUS_ECC_CORRECTION_IRQ |
		ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ |
		ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ |
		ISPCSI2_IRQSTATUS_COMPLEXIO1_ERR_IRQ |
		ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ |
		ISPCSI2_IRQSTATUS_CONTEXT(0);
	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_IRQSTATUS);
	if (enable)
		reg |= isp_reg_readl(isp, csi2->regs1, ISPCSI2_IRQENABLE);
	else
		reg = 0;

	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_IRQENABLE);
}

/*
 * omap3isp_csi2_reset - Resets the CSI2 module.
 *
 * Must be called with the phy lock held.
 *
 * Returns 0 if successful, or -EBUSY if power command didn't respond.
 */
int omap3isp_csi2_reset(struct isp_csi2_device *csi2)
{
	struct isp_device *isp = csi2->isp;
	u8 soft_reset_retries = 0;
	u32 reg;
	int i;

	if (!csi2->available)
		return -ENODEV;

	if (csi2->phy->phy_in_use)
		return -EBUSY;

	isp_reg_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
		    ISPCSI2_SYSCONFIG_SOFT_RESET);

	do {
		reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_SYSSTATUS) &
				    ISPCSI2_SYSSTATUS_RESET_DONE;
		if (reg == ISPCSI2_SYSSTATUS_RESET_DONE)
			break;
		soft_reset_retries++;
		if (soft_reset_retries < 5)
			udelay(100);
	} while (soft_reset_retries < 5);

	if (soft_reset_retries == 5) {
		dev_err(isp->dev, "CSI2: Soft reset try count exceeded!\n");
		return -EBUSY;
	}

	if (isp->revision == ISP_REVISION_15_0)
		isp_reg_set(isp, csi2->regs1, ISPCSI2_PHY_CFG,
			    ISPCSI2_PHY_CFG_RESET_CTRL);

	i = 100;
	do {
		reg = isp_reg_readl(isp, csi2->phy->phy_regs, ISPCSIPHY_REG1)
		    & ISPCSIPHY_REG1_RESET_DONE_CTRLCLK;
		if (reg == ISPCSIPHY_REG1_RESET_DONE_CTRLCLK)
			break;
		udelay(100);
	} while (--i > 0);

	if (i == 0) {
		dev_err(isp->dev,
			"CSI2: Reset for CSI2_96M_FCLK domain Failed!\n");
		return -EBUSY;
	}

	if (isp->autoidle)
		isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_MASK |
				ISPCSI2_SYSCONFIG_AUTO_IDLE,
				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_SMART |
				((isp->revision == ISP_REVISION_15_0) ?
				 ISPCSI2_SYSCONFIG_AUTO_IDLE : 0));
	else
		isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_MASK |
				ISPCSI2_SYSCONFIG_AUTO_IDLE,
				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_NO);

	return 0;
}

static int csi2_configure(struct isp_csi2_device *csi2)
{
	const struct isp_v4l2_subdevs_group *pdata;
	struct isp_device *isp = csi2->isp;
	struct isp_csi2_timing_cfg *timing = &csi2->timing[0];
	struct v4l2_subdev *sensor;
	struct media_pad *pad;

	/*
	 * CSI2 fields that can be updated while the context has
	 * been enabled or the interface has been enabled are not
	 * updated dynamically currently. So we do not allow to
	 * reconfigure if either has been enabled
	 */
	if (csi2->contexts[0].enabled || csi2->ctrl.if_enable)
		return -EBUSY;

	pad = media_entity_remote_pad(&csi2->pads[CSI2_PAD_SINK]);
	sensor = media_entity_to_v4l2_subdev(pad->entity);
	pdata = sensor->host_priv;

	csi2->frame_skip = 0;
	v4l2_subdev_call(sensor, sensor, g_skip_frames, &csi2->frame_skip);

	csi2->ctrl.vp_out_ctrl = pdata->bus.csi2.vpclk_div;
	csi2->ctrl.frame_mode = ISP_CSI2_FRAME_IMMEDIATE;
	csi2->ctrl.ecc_enable = pdata->bus.csi2.crc;

	timing->ionum = 1;
	timing->force_rx_mode = 1;
	timing->stop_state_16x = 1;
	timing->stop_state_4x = 1;
	timing->stop_state_counter = 0x1FF;

	/*
	 * The CSI2 receiver can't do any format conversion except DPCM
	 * decompression, so every set_format call configures both pads
	 * and enables DPCM decompression as a special case:
	 */
	if (csi2->formats[CSI2_PAD_SINK].code !=
	    csi2->formats[CSI2_PAD_SOURCE].code)
		csi2->dpcm_decompress = true;
	else
		csi2->dpcm_decompress = false;

	csi2->contexts[0].format_id = csi2_ctx_map_format(csi2);

	if (csi2->video_out.bpl_padding == 0)
		csi2->contexts[0].data_offset = 0;
	else
		csi2->contexts[0].data_offset = csi2->video_out.bpl_value;

	/*
	 * Enable end of frame and end of line signals generation for
	 * context 0. These signals are generated from CSI2 receiver to
	 * qualify the last pixel of a frame and the last pixel of a line.
	 * Without enabling the signals CSI2 receiver writes data to memory
	 * beyond buffer size and/or data line offset is not handled correctly.
	 */
	csi2->contexts[0].eof_enabled = 1;
	csi2->contexts[0].eol_enabled = 1;

	csi2_irq_complexio1_set(isp, csi2, 1);
	csi2_irq_ctx_set(isp, csi2, 1);
	csi2_irq_status_set(isp, csi2, 1);

	/* Set configuration (timings, format and links) */
	csi2_timing_config(isp, csi2, timing);
	csi2_recv_config(isp, csi2, &csi2->ctrl);
	csi2_ctx_config(isp, csi2, &csi2->contexts[0]);

	return 0;
}

/*
 * csi2_print_status - Prints CSI2 debug information.
 */
#define CSI2_PRINT_REGISTER(isp, regs, name)\
	dev_dbg(isp->dev, "###CSI2 " #name "=0x%08x\n", \
		isp_reg_readl(isp, regs, ISPCSI2_##name))

static void csi2_print_status(struct isp_csi2_device *csi2)
{
	struct isp_device *isp = csi2->isp;

	if (!csi2->available)
		return;

	dev_dbg(isp->dev, "-------------CSI2 Register dump-------------\n");

	CSI2_PRINT_REGISTER(isp, csi2->regs1, SYSCONFIG);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, SYSSTATUS);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, IRQENABLE);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, IRQSTATUS);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTRL);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, DBG_H);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, GNQ);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_CFG);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_IRQSTATUS);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, SHORT_PACKET);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_IRQENABLE);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, DBG_P);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, TIMING);
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL1(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL2(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_OFST(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_PING_ADDR(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_PONG_ADDR(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_IRQENABLE(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_IRQSTATUS(0));
	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL3(0));

	dev_dbg(isp->dev, "--------------------------------------------\n");
}

/* -----------------------------------------------------------------------------
 * Interrupt handling
 */

/*
 * csi2_isr_buffer - Does buffer handling at end-of-frame
 * when writing to memory.
 */
static void csi2_isr_buffer(struct isp_csi2_device *csi2)
{
	struct isp_device *isp = csi2->isp;
	struct isp_buffer *buffer;

	csi2_ctx_enable(isp, csi2, 0, 0);

	buffer = omap3isp_video_buffer_next(&csi2->video_out);

	/*
	 * Let video queue operation restart engine if there is an underrun
	 * condition.
	 */
	if (buffer == NULL)
		return;

	csi2_set_outaddr(csi2, buffer->isp_addr);
	csi2_ctx_enable(isp, csi2, 0, 1);
}

static void csi2_isr_ctx(struct isp_csi2_device *csi2,
			 struct isp_csi2_ctx_cfg *ctx)
{
	struct isp_device *isp = csi2->isp;
	unsigned int n = ctx->ctxnum;
	u32 status;

	status = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_IRQSTATUS(n));
	isp_reg_writel(isp, status, csi2->regs1, ISPCSI2_CTX_IRQSTATUS(n));

	if (!(status & ISPCSI2_CTX_IRQSTATUS_FE_IRQ))
		return;

	/* Skip interrupts until we reach the frame skip count. The CSI2 will be
	 * automatically disabled, as the frame skip count has been programmed
	 * in the CSI2_CTx_CTRL1::COUNT field, so reenable it.
	 *
	 * It would have been nice to rely on the FRAME_NUMBER interrupt instead
	 * but it turned out that the interrupt is only generated when the CSI2
	 * writes to memory (the CSI2_CTx_CTRL1::COUNT field is decreased
	 * correctly and reaches 0 when data is forwarded to the video port only
	 * but no interrupt arrives). Maybe a CSI2 hardware bug.
	 */
	if (csi2->frame_skip) {
		csi2->frame_skip--;
		if (csi2->frame_skip == 0) {
			ctx->format_id = csi2_ctx_map_format(csi2);
			csi2_ctx_config(isp, csi2, ctx);
			csi2_ctx_enable(isp, csi2, n, 1);
		}
		return;
	}

	if (csi2->output & CSI2_OUTPUT_MEMORY)
		csi2_isr_buffer(csi2);
}

/*
 * omap3isp_csi2_isr - CSI2 interrupt handling.
 */
void omap3isp_csi2_isr(struct isp_csi2_device *csi2)
{
	struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
	u32 csi2_irqstatus, cpxio1_irqstatus;
	struct isp_device *isp = csi2->isp;

	if (!csi2->available)
		return;

	csi2_irqstatus = isp_reg_readl(isp, csi2->regs1, ISPCSI2_IRQSTATUS);
	isp_reg_writel(isp, csi2_irqstatus, csi2->regs1, ISPCSI2_IRQSTATUS);

	/* Failure Cases */
	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_COMPLEXIO1_ERR_IRQ) {
		cpxio1_irqstatus = isp_reg_readl(isp, csi2->regs1,
						 ISPCSI2_PHY_IRQSTATUS);
		isp_reg_writel(isp, cpxio1_irqstatus,
			       csi2->regs1, ISPCSI2_PHY_IRQSTATUS);
		dev_dbg(isp->dev, "CSI2: ComplexIO Error IRQ "
			"%x\n", cpxio1_irqstatus);
		pipe->error = true;
	}

	if (csi2_irqstatus & (ISPCSI2_IRQSTATUS_OCP_ERR_IRQ |
			      ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ |
			      ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ |
			      ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ |
			      ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ)) {
		dev_dbg(isp->dev, "CSI2 Err:"
			" OCP:%d,"
			" Short_pack:%d,"
			" ECC:%d,"
			" CPXIO2:%d,"
			" FIFO_OVF:%d,"
			"\n",
			(csi2_irqstatus &
			 ISPCSI2_IRQSTATUS_OCP_ERR_IRQ) ? 1 : 0,
			(csi2_irqstatus &
			 ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ) ? 1 : 0,
			(csi2_irqstatus &
			 ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ) ? 1 : 0,
			(csi2_irqstatus &
			 ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ) ? 1 : 0,
			(csi2_irqstatus &
			 ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ) ? 1 : 0);
		pipe->error = true;
	}

	if (omap3isp_module_sync_is_stopping(&csi2->wait, &csi2->stopping))
		return;

	/* Successful cases */
	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_CONTEXT(0))
		csi2_isr_ctx(csi2, &csi2->contexts[0]);

	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_ECC_CORRECTION_IRQ)
		dev_dbg(isp->dev, "CSI2: ECC correction done\n");
}

/* -----------------------------------------------------------------------------
 * ISP video operations
 */

/*
 * csi2_queue - Queues the first buffer when using memory output
 * @video: The video node
 * @buffer: buffer to queue
 */
static int csi2_queue(struct isp_video *video, struct isp_buffer *buffer)
{
	struct isp_device *isp = video->isp;
	struct isp_csi2_device *csi2 = &isp->isp_csi2a;

	csi2_set_outaddr(csi2, buffer->isp_addr);

	/*
	 * If streaming was enabled before there was a buffer queued
	 * or underrun happened in the ISR, the hardware was not enabled
	 * and DMA queue flag ISP_VIDEO_DMAQUEUE_UNDERRUN is still set.
	 * Enable it now.
	 */
	if (csi2->video_out.dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
		/* Enable / disable context 0 and IRQs */
		csi2_if_enable(isp, csi2, 1);
		csi2_ctx_enable(isp, csi2, 0, 1);
		isp_video_dmaqueue_flags_clr(&csi2->video_out);
	}

	return 0;
}

static const struct isp_video_operations csi2_ispvideo_ops = {
	.queue = csi2_queue,
};

/* -----------------------------------------------------------------------------
 * V4L2 subdev operations
 */

static struct v4l2_mbus_framefmt *
__csi2_get_format(struct isp_csi2_device *csi2, struct v4l2_subdev_fh *fh,
		  unsigned int pad, enum v4l2_subdev_format_whence which)
{
	if (which == V4L2_SUBDEV_FORMAT_TRY)
		return v4l2_subdev_get_try_format(fh, pad);
	else
		return &csi2->formats[pad];
}

static void
csi2_try_format(struct isp_csi2_device *csi2, struct v4l2_subdev_fh *fh,
		unsigned int pad, struct v4l2_mbus_framefmt *fmt,
		enum v4l2_subdev_format_whence which)
{
	enum v4l2_mbus_pixelcode pixelcode;
	struct v4l2_mbus_framefmt *format;
	const struct isp_format_info *info;
	unsigned int i;

	switch (pad) {
	case CSI2_PAD_SINK:
		/* Clamp the width and height to valid range (1-8191). */
		for (i = 0; i < ARRAY_SIZE(csi2_input_fmts); i++) {
			if (fmt->code == csi2_input_fmts[i])
				break;
		}

		/* If not found, use SGRBG10 as default */
		if (i >= ARRAY_SIZE(csi2_input_fmts))
			fmt->code = V4L2_MBUS_FMT_SGRBG10_1X10;

		fmt->width = clamp_t(u32, fmt->width, 1, 8191);
		fmt->height = clamp_t(u32, fmt->height, 1, 8191);
		break;

	case CSI2_PAD_SOURCE:
		/* Source format same as sink format, except for DPCM
		 * compression.
		 */
		pixelcode = fmt->code;
		format = __csi2_get_format(csi2, fh, CSI2_PAD_SINK, which);
		memcpy(fmt, format, sizeof(*fmt));

		/*
		 * Only Allow DPCM decompression, and check that the
		 * pattern is preserved
		 */
		info = omap3isp_video_format_info(fmt->code);
		if (info->uncompressed == pixelcode)
			fmt->code = pixelcode;
		break;
	}

	/* RGB, non-interlaced */
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	fmt->field = V4L2_FIELD_NONE;
}

/*
 * csi2_enum_mbus_code - Handle pixel format enumeration
 * @sd     : pointer to v4l2 subdev structure
 * @fh     : V4L2 subdev file handle
 * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 * return -EINVAL or zero on success
 */
static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
			       struct v4l2_subdev_fh *fh,
			       struct v4l2_subdev_mbus_code_enum *code)
{
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format;
	const struct isp_format_info *info;

	if (code->pad == CSI2_PAD_SINK) {
		if (code->index >= ARRAY_SIZE(csi2_input_fmts))
			return -EINVAL;

		code->code = csi2_input_fmts[code->index];
	} else {
		format = __csi2_get_format(csi2, fh, CSI2_PAD_SINK,
					   V4L2_SUBDEV_FORMAT_TRY);
		switch (code->index) {
		case 0:
			/* Passthrough sink pad code */
			code->code = format->code;
			break;
		case 1:
			/* Uncompressed code */
			info = omap3isp_video_format_info(format->code);
			if (info->uncompressed == format->code)
				return -EINVAL;

			code->code = info->uncompressed;
			break;
		default:
			return -EINVAL;
		}
	}

	return 0;
}

static int csi2_enum_frame_size(struct v4l2_subdev *sd,
				struct v4l2_subdev_fh *fh,
				struct v4l2_subdev_frame_size_enum *fse)
{
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt format;

	if (fse->index != 0)
		return -EINVAL;

	format.code = fse->code;
	format.width = 1;
	format.height = 1;
	csi2_try_format(csi2, fh, fse->pad, &format, V4L2_SUBDEV_FORMAT_TRY);
	fse->min_width = format.width;
	fse->min_height = format.height;

	if (format.code != fse->code)
		return -EINVAL;

	format.code = fse->code;
	format.width = -1;
	format.height = -1;
	csi2_try_format(csi2, fh, fse->pad, &format, V4L2_SUBDEV_FORMAT_TRY);
	fse->max_width = format.width;
	fse->max_height = format.height;

	return 0;
}

/*
 * csi2_get_format - Handle get format by pads subdev method
 * @sd : pointer to v4l2 subdev structure
 * @fh : V4L2 subdev file handle
 * @fmt: pointer to v4l2 subdev format structure
 * return -EINVAL or zero on success
 */
static int csi2_get_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
			   struct v4l2_subdev_format *fmt)
{
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format;

	format = __csi2_get_format(csi2, fh, fmt->pad, fmt->which);
	if (format == NULL)
		return -EINVAL;

	fmt->format = *format;
	return 0;
}

/*
 * csi2_set_format - Handle set format by pads subdev method
 * @sd : pointer to v4l2 subdev structure
 * @fh : V4L2 subdev file handle
 * @fmt: pointer to v4l2 subdev format structure
 * return -EINVAL or zero on success
 */
static int csi2_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
			   struct v4l2_subdev_format *fmt)
{
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format;

	format = __csi2_get_format(csi2, fh, fmt->pad, fmt->which);
	if (format == NULL)
		return -EINVAL;

	csi2_try_format(csi2, fh, fmt->pad, &fmt->format, fmt->which);
	*format = fmt->format;

	/* Propagate the format from sink to source */
	if (fmt->pad == CSI2_PAD_SINK) {
		format = __csi2_get_format(csi2, fh, CSI2_PAD_SOURCE,
					   fmt->which);
		*format = fmt->format;
		csi2_try_format(csi2, fh, CSI2_PAD_SOURCE, format, fmt->which);
	}

	return 0;
}

/*
 * csi2_init_formats - Initialize formats on all pads
 * @sd: ISP CSI2 V4L2 subdevice
 * @fh: V4L2 subdev file handle
 *
 * Initialize all pad formats with default values. If fh is not NULL, try
 * formats are initialized on the file handle. Otherwise active formats are
 * initialized on the device.
 */
static int csi2_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct v4l2_subdev_format format;

	memset(&format, 0, sizeof(format));
	format.pad = CSI2_PAD_SINK;
	format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
	format.format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
	format.format.width = 4096;
	format.format.height = 4096;
	csi2_set_format(sd, fh, &format);

	return 0;
}

/*
 * csi2_set_stream - Enable/Disable streaming on the CSI2 module
 * @sd: ISP CSI2 V4L2 subdevice
 * @enable: ISP pipeline stream state
 *
 * Return 0 on success or a negative error code otherwise.
 */
static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct isp_device *isp = csi2->isp;
	struct isp_video *video_out = &csi2->video_out;

	switch (enable) {
	case ISP_PIPELINE_STREAM_CONTINUOUS:
		if (omap3isp_csiphy_acquire(csi2->phy) < 0)
			return -ENODEV;
		if (csi2->output & CSI2_OUTPUT_MEMORY)
			omap3isp_sbl_enable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
		csi2_configure(csi2);
		csi2_print_status(csi2);

		/*
		 * When outputting to memory with no buffer available, let the
		 * buffer queue handler start the hardware. A DMA queue flag
		 * ISP_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
		 * a buffer available.
		 */
		if (csi2->output & CSI2_OUTPUT_MEMORY &&
		    !(video_out->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_QUEUED))
			break;
		/* Enable context 0 and IRQs */
		atomic_set(&csi2->stopping, 0);
		csi2_ctx_enable(isp, csi2, 0, 1);
		csi2_if_enable(isp, csi2, 1);
		isp_video_dmaqueue_flags_clr(video_out);
		break;

	case ISP_PIPELINE_STREAM_STOPPED:
		if (csi2->state == ISP_PIPELINE_STREAM_STOPPED)
			return 0;
		if (omap3isp_module_sync_idle(&sd->entity, &csi2->wait,
					      &csi2->stopping))
			dev_dbg(isp->dev, "%s: module stop timeout.\n",
				sd->name);
		csi2_ctx_enable(isp, csi2, 0, 0);
		csi2_if_enable(isp, csi2, 0);
		csi2_irq_ctx_set(isp, csi2, 0);
		omap3isp_csiphy_release(csi2->phy);
		isp_video_dmaqueue_flags_clr(video_out);
		omap3isp_sbl_disable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
		break;
	}

	csi2->state = enable;
	return 0;
}

/* subdev video operations */
static const struct v4l2_subdev_video_ops csi2_video_ops = {
	.s_stream = csi2_set_stream,
};

/* subdev pad operations */
static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
	.enum_mbus_code = csi2_enum_mbus_code,
	.enum_frame_size = csi2_enum_frame_size,
	.get_fmt = csi2_get_format,
	.set_fmt = csi2_set_format,
};

/* subdev operations */
static const struct v4l2_subdev_ops csi2_ops = {
	.video = &csi2_video_ops,
	.pad = &csi2_pad_ops,
};

/* subdev internal operations */
static const struct v4l2_subdev_internal_ops csi2_internal_ops = {
	.open = csi2_init_formats,
};

/* -----------------------------------------------------------------------------
 * Media entity operations
 */

/*
 * csi2_link_setup - Setup CSI2 connections.
 * @entity : Pointer to media entity structure
 * @local  : Pointer to local pad array
 * @remote : Pointer to remote pad array
 * @flags  : Link flags
 * return -EINVAL or zero on success
 */
static int csi2_link_setup(struct media_entity *entity,
			   const struct media_pad *local,
			   const struct media_pad *remote, u32 flags)
{
	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
	struct isp_csi2_ctrl_cfg *ctrl = &csi2->ctrl;

	/*
	 * The ISP core doesn't support pipelines with multiple video outputs.
	 * Revisit this when it will be implemented, and return -EBUSY for now.
	 */

	switch (local->index | media_entity_type(remote->entity)) {
	case CSI2_PAD_SOURCE | MEDIA_ENT_T_DEVNODE:
		if (flags & MEDIA_LNK_FL_ENABLED) {
			if (csi2->output & ~CSI2_OUTPUT_MEMORY)
				return -EBUSY;
			csi2->output |= CSI2_OUTPUT_MEMORY;
		} else {
			csi2->output &= ~CSI2_OUTPUT_MEMORY;
		}
		break;

	case CSI2_PAD_SOURCE | MEDIA_ENT_T_V4L2_SUBDEV:
		if (flags & MEDIA_LNK_FL_ENABLED) {
			if (csi2->output & ~CSI2_OUTPUT_CCDC)
				return -EBUSY;
			csi2->output |= CSI2_OUTPUT_CCDC;
		} else {
			csi2->output &= ~CSI2_OUTPUT_CCDC;
		}
		break;

	default:
		/* Link from camera to CSI2 is fixed... */
		return -EINVAL;
	}

	ctrl->vp_only_enable =
		(csi2->output & CSI2_OUTPUT_MEMORY) ? false : true;
	ctrl->vp_clk_enable = !!(csi2->output & CSI2_OUTPUT_CCDC);

	return 0;
}

/* media operations */
static const struct media_entity_operations csi2_media_ops = {
	.link_setup = csi2_link_setup,
	.link_validate = v4l2_subdev_link_validate,
};

void omap3isp_csi2_unregister_entities(struct isp_csi2_device *csi2)
{
	v4l2_device_unregister_subdev(&csi2->subdev);
	omap3isp_video_unregister(&csi2->video_out);
}

int omap3isp_csi2_register_entities(struct isp_csi2_device *csi2,
				    struct v4l2_device *vdev)
{
	int ret;

	/* Register the subdev and video nodes. */
	ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
	if (ret < 0)
		goto error;

	ret = omap3isp_video_register(&csi2->video_out, vdev);
	if (ret < 0)
		goto error;

	return 0;

error:
	omap3isp_csi2_unregister_entities(csi2);
	return ret;
}

/* -----------------------------------------------------------------------------
 * ISP CSI2 initialisation and cleanup
 */

/*
 * csi2_init_entities - Initialize subdev and media entity.
 * @csi2: Pointer to csi2 structure.
 * return -ENOMEM or zero on success
 */
static int csi2_init_entities(struct isp_csi2_device *csi2)
{
	struct v4l2_subdev *sd = &csi2->subdev;
	struct media_pad *pads = csi2->pads;
	struct media_entity *me = &sd->entity;
	int ret;

	v4l2_subdev_init(sd, &csi2_ops);
	sd->internal_ops = &csi2_internal_ops;
	strlcpy(sd->name, "OMAP3 ISP CSI2a", sizeof(sd->name));

	sd->grp_id = 1 << 16;	/* group ID for isp subdevs */
	v4l2_set_subdevdata(sd, csi2);
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
	pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;

	me->ops = &csi2_media_ops;
	ret = media_entity_init(me, CSI2_PADS_NUM, pads, 0);
	if (ret < 0)
		return ret;

	csi2_init_formats(sd, NULL);

	/* Video device node */
	csi2->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	csi2->video_out.ops = &csi2_ispvideo_ops;
	csi2->video_out.bpl_alignment = 32;
	csi2->video_out.bpl_zero_padding = 1;
	csi2->video_out.bpl_max = 0x1ffe0;
	csi2->video_out.isp = csi2->isp;
	csi2->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;

	ret = omap3isp_video_init(&csi2->video_out, "CSI2a");
	if (ret < 0)
		goto error_video;

	/* Connect the CSI2 subdev to the video node. */
	ret = media_entity_create_link(&csi2->subdev.entity, CSI2_PAD_SOURCE,
				       &csi2->video_out.video.entity, 0, 0);
	if (ret < 0)
		goto error_link;

	return 0;

error_link:
	omap3isp_video_cleanup(&csi2->video_out);
error_video:
	media_entity_cleanup(&csi2->subdev.entity);
	return ret;
}

/*
 * omap3isp_csi2_init - Routine for module driver init
 */
int omap3isp_csi2_init(struct isp_device *isp)
{
	struct isp_csi2_device *csi2a = &isp->isp_csi2a;
	struct isp_csi2_device *csi2c = &isp->isp_csi2c;
	int ret;

	csi2a->isp = isp;
	csi2a->available = 1;
	csi2a->regs1 = OMAP3_ISP_IOMEM_CSI2A_REGS1;
	csi2a->regs2 = OMAP3_ISP_IOMEM_CSI2A_REGS2;
	csi2a->phy = &isp->isp_csiphy2;
	csi2a->state = ISP_PIPELINE_STREAM_STOPPED;
	init_waitqueue_head(&csi2a->wait);

	ret = csi2_init_entities(csi2a);
	if (ret < 0)
		return ret;

	if (isp->revision == ISP_REVISION_15_0) {
		csi2c->isp = isp;
		csi2c->available = 1;
		csi2c->regs1 = OMAP3_ISP_IOMEM_CSI2C_REGS1;
		csi2c->regs2 = OMAP3_ISP_IOMEM_CSI2C_REGS2;
		csi2c->phy = &isp->isp_csiphy1;
		csi2c->state = ISP_PIPELINE_STREAM_STOPPED;
		init_waitqueue_head(&csi2c->wait);
	}

	return 0;
}

/*
 * omap3isp_csi2_cleanup - Routine for module driver cleanup
 */
void omap3isp_csi2_cleanup(struct isp_device *isp)
{
	struct isp_csi2_device *csi2a = &isp->isp_csi2a;

	omap3isp_video_cleanup(&csi2a->video_out);
	media_entity_cleanup(&csi2a->subdev.entity);
}