Free Electrons

Embedded Linux Experts

   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
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
/*
 * SuperH Video Output Unit (VOU) driver
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * 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.
 */

#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/module.h>

#include <media/sh_vou.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mediabus.h>
#include <media/videobuf-dma-contig.h>

/* Mirror addresses are not available for all registers */
#define VOUER	0
#define VOUCR	4
#define VOUSTR	8
#define VOUVCR	0xc
#define VOUISR	0x10
#define VOUBCR	0x14
#define VOUDPR	0x18
#define VOUDSR	0x1c
#define VOUVPR	0x20
#define VOUIR	0x24
#define VOUSRR	0x28
#define VOUMSR	0x2c
#define VOUHIR	0x30
#define VOUDFR	0x34
#define VOUAD1R	0x38
#define VOUAD2R	0x3c
#define VOUAIR	0x40
#define VOUSWR	0x44
#define VOURCR	0x48
#define VOURPR	0x50

enum sh_vou_status {
	SH_VOU_IDLE,
	SH_VOU_INITIALISING,
	SH_VOU_RUNNING,
};

#define VOU_MAX_IMAGE_WIDTH	720
#define VOU_MAX_IMAGE_HEIGHT	576

struct sh_vou_device {
	struct v4l2_device v4l2_dev;
	struct video_device *vdev;
	atomic_t use_count;
	struct sh_vou_pdata *pdata;
	spinlock_t lock;
	void __iomem *base;
	/* State information */
	struct v4l2_pix_format pix;
	struct v4l2_rect rect;
	struct list_head queue;
	v4l2_std_id std;
	int pix_idx;
	struct videobuf_buffer *active;
	enum sh_vou_status status;
	struct mutex fop_lock;
};

struct sh_vou_file {
	struct videobuf_queue vbq;
};

/* Register access routines for sides A, B and mirror addresses */
static void sh_vou_reg_a_write(struct sh_vou_device *vou_dev, unsigned int reg,
			       u32 value)
{
	__raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_ab_write(struct sh_vou_device *vou_dev, unsigned int reg,
				u32 value)
{
	__raw_writel(value, vou_dev->base + reg);
	__raw_writel(value, vou_dev->base + reg + 0x1000);
}

static void sh_vou_reg_m_write(struct sh_vou_device *vou_dev, unsigned int reg,
			       u32 value)
{
	__raw_writel(value, vou_dev->base + reg + 0x2000);
}

static u32 sh_vou_reg_a_read(struct sh_vou_device *vou_dev, unsigned int reg)
{
	return __raw_readl(vou_dev->base + reg);
}

static void sh_vou_reg_a_set(struct sh_vou_device *vou_dev, unsigned int reg,
			     u32 value, u32 mask)
{
	u32 old = __raw_readl(vou_dev->base + reg);

	value = (value & mask) | (old & ~mask);
	__raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_b_set(struct sh_vou_device *vou_dev, unsigned int reg,
			     u32 value, u32 mask)
{
	sh_vou_reg_a_set(vou_dev, reg + 0x1000, value, mask);
}

static void sh_vou_reg_ab_set(struct sh_vou_device *vou_dev, unsigned int reg,
			      u32 value, u32 mask)
{
	sh_vou_reg_a_set(vou_dev, reg, value, mask);
	sh_vou_reg_b_set(vou_dev, reg, value, mask);
}

struct sh_vou_fmt {
	u32		pfmt;
	char		*desc;
	unsigned char	bpp;
	unsigned char	rgb;
	unsigned char	yf;
	unsigned char	pkf;
};

/* Further pixel formats can be added */
static struct sh_vou_fmt vou_fmt[] = {
	{
		.pfmt	= V4L2_PIX_FMT_NV12,
		.bpp	= 12,
		.desc	= "YVU420 planar",
		.yf	= 0,
		.rgb	= 0,
	},
	{
		.pfmt	= V4L2_PIX_FMT_NV16,
		.bpp	= 16,
		.desc	= "YVYU planar",
		.yf	= 1,
		.rgb	= 0,
	},
	{
		.pfmt	= V4L2_PIX_FMT_RGB24,
		.bpp	= 24,
		.desc	= "RGB24",
		.pkf	= 2,
		.rgb	= 1,
	},
	{
		.pfmt	= V4L2_PIX_FMT_RGB565,
		.bpp	= 16,
		.desc	= "RGB565",
		.pkf	= 3,
		.rgb	= 1,
	},
	{
		.pfmt	= V4L2_PIX_FMT_RGB565X,
		.bpp	= 16,
		.desc	= "RGB565 byteswapped",
		.pkf	= 3,
		.rgb	= 1,
	},
};

static void sh_vou_schedule_next(struct sh_vou_device *vou_dev,
				 struct videobuf_buffer *vb)
{
	dma_addr_t addr1, addr2;

	addr1 = videobuf_to_dma_contig(vb);
	switch (vou_dev->pix.pixelformat) {
	case V4L2_PIX_FMT_NV12:
	case V4L2_PIX_FMT_NV16:
		addr2 = addr1 + vou_dev->pix.width * vou_dev->pix.height;
		break;
	default:
		addr2 = 0;
	}

	sh_vou_reg_m_write(vou_dev, VOUAD1R, addr1);
	sh_vou_reg_m_write(vou_dev, VOUAD2R, addr2);
}

static void sh_vou_stream_start(struct sh_vou_device *vou_dev,
				struct videobuf_buffer *vb)
{
	unsigned int row_coeff;
#ifdef __LITTLE_ENDIAN
	u32 dataswap = 7;
#else
	u32 dataswap = 0;
#endif

	switch (vou_dev->pix.pixelformat) {
	case V4L2_PIX_FMT_NV12:
	case V4L2_PIX_FMT_NV16:
		row_coeff = 1;
		break;
	case V4L2_PIX_FMT_RGB565:
		dataswap ^= 1;
	case V4L2_PIX_FMT_RGB565X:
		row_coeff = 2;
		break;
	case V4L2_PIX_FMT_RGB24:
		row_coeff = 3;
		break;
	}

	sh_vou_reg_a_write(vou_dev, VOUSWR, dataswap);
	sh_vou_reg_ab_write(vou_dev, VOUAIR, vou_dev->pix.width * row_coeff);
	sh_vou_schedule_next(vou_dev, vb);
}

static void free_buffer(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
	BUG_ON(in_interrupt());

	/* Wait until this buffer is no longer in STATE_QUEUED or STATE_ACTIVE */
	videobuf_waiton(vq, vb, 0, 0);
	videobuf_dma_contig_free(vq, vb);
	vb->state = VIDEOBUF_NEEDS_INIT;
}

/* Locking: caller holds fop_lock mutex */
static int sh_vou_buf_setup(struct videobuf_queue *vq, unsigned int *count,
			    unsigned int *size)
{
	struct video_device *vdev = vq->priv_data;
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	*size = vou_fmt[vou_dev->pix_idx].bpp * vou_dev->pix.width *
		vou_dev->pix.height / 8;

	if (*count < 2)
		*count = 2;

	/* Taking into account maximum frame size, *count will stay >= 2 */
	if (PAGE_ALIGN(*size) * *count > 4 * 1024 * 1024)
		*count = 4 * 1024 * 1024 / PAGE_ALIGN(*size);

	dev_dbg(vq->dev, "%s(): count=%d, size=%d\n", __func__, *count, *size);

	return 0;
}

/* Locking: caller holds fop_lock mutex */
static int sh_vou_buf_prepare(struct videobuf_queue *vq,
			      struct videobuf_buffer *vb,
			      enum v4l2_field field)
{
	struct video_device *vdev = vq->priv_data;
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct v4l2_pix_format *pix = &vou_dev->pix;
	int bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;
	int ret;

	dev_dbg(vq->dev, "%s()\n", __func__);

	if (vb->width	!= pix->width ||
	    vb->height	!= pix->height ||
	    vb->field	!= pix->field) {
		vb->width	= pix->width;
		vb->height	= pix->height;
		vb->field	= field;
		if (vb->state != VIDEOBUF_NEEDS_INIT)
			free_buffer(vq, vb);
	}

	vb->size = vb->height * bytes_per_line;
	if (vb->baddr && vb->bsize < vb->size) {
		/* User buffer too small */
		dev_warn(vq->dev, "User buffer too small: [%u] @ %lx\n",
			 vb->bsize, vb->baddr);
		return -EINVAL;
	}

	if (vb->state == VIDEOBUF_NEEDS_INIT) {
		ret = videobuf_iolock(vq, vb, NULL);
		if (ret < 0) {
			dev_warn(vq->dev, "IOLOCK buf-type %d: %d\n",
				 vb->memory, ret);
			return ret;
		}
		vb->state = VIDEOBUF_PREPARED;
	}

	dev_dbg(vq->dev,
		"%s(): fmt #%d, %u bytes per line, phys 0x%x, type %d, state %d\n",
		__func__, vou_dev->pix_idx, bytes_per_line,
		videobuf_to_dma_contig(vb), vb->memory, vb->state);

	return 0;
}

/* Locking: caller holds fop_lock mutex and vq->irqlock spinlock */
static void sh_vou_buf_queue(struct videobuf_queue *vq,
			     struct videobuf_buffer *vb)
{
	struct video_device *vdev = vq->priv_data;
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	dev_dbg(vq->dev, "%s()\n", __func__);

	vb->state = VIDEOBUF_QUEUED;
	list_add_tail(&vb->queue, &vou_dev->queue);

	if (vou_dev->status == SH_VOU_RUNNING) {
		return;
	} else if (!vou_dev->active) {
		vou_dev->active = vb;
		/* Start from side A: we use mirror addresses, so, set B */
		sh_vou_reg_a_write(vou_dev, VOURPR, 1);
		dev_dbg(vq->dev, "%s: first buffer status 0x%x\n", __func__,
			sh_vou_reg_a_read(vou_dev, VOUSTR));
		sh_vou_schedule_next(vou_dev, vb);
		/* Only activate VOU after the second buffer */
	} else if (vou_dev->active->queue.next == &vb->queue) {
		/* Second buffer - initialise register side B */
		sh_vou_reg_a_write(vou_dev, VOURPR, 0);
		sh_vou_stream_start(vou_dev, vb);

		/* Register side switching with frame VSYNC */
		sh_vou_reg_a_write(vou_dev, VOURCR, 5);
		dev_dbg(vq->dev, "%s: second buffer status 0x%x\n", __func__,
			sh_vou_reg_a_read(vou_dev, VOUSTR));

		/* Enable End-of-Frame (VSYNC) interrupts */
		sh_vou_reg_a_write(vou_dev, VOUIR, 0x10004);
		/* Two buffers on the queue - activate the hardware */

		vou_dev->status = SH_VOU_RUNNING;
		sh_vou_reg_a_write(vou_dev, VOUER, 0x107);
	}
}

static void sh_vou_buf_release(struct videobuf_queue *vq,
			       struct videobuf_buffer *vb)
{
	struct video_device *vdev = vq->priv_data;
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	unsigned long flags;

	dev_dbg(vq->dev, "%s()\n", __func__);

	spin_lock_irqsave(&vou_dev->lock, flags);

	if (vou_dev->active == vb) {
		/* disable output */
		sh_vou_reg_a_set(vou_dev, VOUER, 0, 1);
		/* ...but the current frame will complete */
		sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x30000);
		vou_dev->active = NULL;
	}

	if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED)) {
		vb->state = VIDEOBUF_ERROR;
		list_del(&vb->queue);
	}

	spin_unlock_irqrestore(&vou_dev->lock, flags);

	free_buffer(vq, vb);
}

static struct videobuf_queue_ops sh_vou_video_qops = {
	.buf_setup	= sh_vou_buf_setup,
	.buf_prepare	= sh_vou_buf_prepare,
	.buf_queue	= sh_vou_buf_queue,
	.buf_release	= sh_vou_buf_release,
};

/* Video IOCTLs */
static int sh_vou_querycap(struct file *file, void  *priv,
			   struct v4l2_capability *cap)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	strlcpy(cap->card, "SuperH VOU", sizeof(cap->card));
	cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
	return 0;
}

/* Enumerate formats, that the device can accept from the user */
static int sh_vou_enum_fmt_vid_out(struct file *file, void  *priv,
				   struct v4l2_fmtdesc *fmt)
{
	struct sh_vou_file *vou_file = priv;

	if (fmt->index >= ARRAY_SIZE(vou_fmt))
		return -EINVAL;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	strlcpy(fmt->description, vou_fmt[fmt->index].desc,
		sizeof(fmt->description));
	fmt->pixelformat = vou_fmt[fmt->index].pfmt;

	return 0;
}

static int sh_vou_g_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	fmt->fmt.pix = vou_dev->pix;

	return 0;
}

static const unsigned char vou_scale_h_num[] = {1, 9, 2, 9, 4};
static const unsigned char vou_scale_h_den[] = {1, 8, 1, 4, 1};
static const unsigned char vou_scale_h_fld[] = {0, 2, 1, 3};
static const unsigned char vou_scale_v_num[] = {1, 2, 4};
static const unsigned char vou_scale_v_den[] = {1, 1, 1};
static const unsigned char vou_scale_v_fld[] = {0, 1};

static void sh_vou_configure_geometry(struct sh_vou_device *vou_dev,
				      int pix_idx, int w_idx, int h_idx)
{
	struct sh_vou_fmt *fmt = vou_fmt + pix_idx;
	unsigned int black_left, black_top, width_max, height_max,
		frame_in_height, frame_out_height, frame_out_top;
	struct v4l2_rect *rect = &vou_dev->rect;
	struct v4l2_pix_format *pix = &vou_dev->pix;
	u32 vouvcr = 0, dsr_h, dsr_v;

	if (vou_dev->std & V4L2_STD_525_60) {
		width_max = 858;
		height_max = 262;
	} else {
		width_max = 864;
		height_max = 312;
	}

	frame_in_height = pix->height / 2;
	frame_out_height = rect->height / 2;
	frame_out_top = rect->top / 2;

	/*
	 * Cropping scheme: max useful image is 720x480, and the total video
	 * area is 858x525 (NTSC) or 864x625 (PAL). AK8813 / 8814 starts
	 * sampling data beginning with fixed 276th (NTSC) / 288th (PAL) clock,
	 * of which the first 33 / 25 clocks HSYNC must be held active. This
	 * has to be configured in CR[HW]. 1 pixel equals 2 clock periods.
	 * This gives CR[HW] = 16 / 12, VPR[HVP] = 138 / 144, which gives
	 * exactly 858 - 138 = 864 - 144 = 720! We call the out-of-display area,
	 * beyond DSR, specified on the left and top by the VPR register "black
	 * pixels" and out-of-image area (DPR) "background pixels." We fix VPR
	 * at 138 / 144 : 20, because that's the HSYNC timing, that our first
	 * client requires, and that's exactly what leaves us 720 pixels for the
	 * image; we leave VPR[VVP] at default 20 for now, because the client
	 * doesn't seem to have any special requirements for it. Otherwise we
	 * could also set it to max - 240 = 22 / 72. Thus VPR depends only on
	 * the selected standard, and DPR and DSR are selected according to
	 * cropping. Q: how does the client detect the first valid line? Does
	 * HSYNC stay inactive during invalid (black) lines?
	 */
	black_left = width_max - VOU_MAX_IMAGE_WIDTH;
	black_top = 20;

	dsr_h = rect->width + rect->left;
	dsr_v = frame_out_height + frame_out_top;

	dev_dbg(vou_dev->v4l2_dev.dev,
		"image %ux%u, black %u:%u, offset %u:%u, display %ux%u\n",
		pix->width, frame_in_height, black_left, black_top,
		rect->left, frame_out_top, dsr_h, dsr_v);

	/* VOUISR height - half of a frame height in frame mode */
	sh_vou_reg_ab_write(vou_dev, VOUISR, (pix->width << 16) | frame_in_height);
	sh_vou_reg_ab_write(vou_dev, VOUVPR, (black_left << 16) | black_top);
	sh_vou_reg_ab_write(vou_dev, VOUDPR, (rect->left << 16) | frame_out_top);
	sh_vou_reg_ab_write(vou_dev, VOUDSR, (dsr_h << 16) | dsr_v);

	/*
	 * if necessary, we could set VOUHIR to
	 * max(black_left + dsr_h, width_max) here
	 */

	if (w_idx)
		vouvcr |= (1 << 15) | (vou_scale_h_fld[w_idx - 1] << 4);
	if (h_idx)
		vouvcr |= (1 << 14) | vou_scale_v_fld[h_idx - 1];

	dev_dbg(vou_dev->v4l2_dev.dev, "%s: scaling 0x%x\n", fmt->desc, vouvcr);

	/* To produce a colour bar for testing set bit 23 of VOUVCR */
	sh_vou_reg_ab_write(vou_dev, VOUVCR, vouvcr);
	sh_vou_reg_ab_write(vou_dev, VOUDFR,
			    fmt->pkf | (fmt->yf << 8) | (fmt->rgb << 16));
}

struct sh_vou_geometry {
	struct v4l2_rect output;
	unsigned int in_width;
	unsigned int in_height;
	int scale_idx_h;
	int scale_idx_v;
};

/*
 * Find input geometry, that we can use to produce output, closest to the
 * requested rectangle, using VOU scaling
 */
static void vou_adjust_input(struct sh_vou_geometry *geo, v4l2_std_id std)
{
	/* The compiler cannot know, that best and idx will indeed be set */
	unsigned int best_err = UINT_MAX, best = 0, img_height_max;
	int i, idx = 0;

	if (std & V4L2_STD_525_60)
		img_height_max = 480;
	else
		img_height_max = 576;

	/* Image width must be a multiple of 4 */
	v4l_bound_align_image(&geo->in_width, 0, VOU_MAX_IMAGE_WIDTH, 2,
			      &geo->in_height, 0, img_height_max, 1, 0);

	/* Select scales to come as close as possible to the output image */
	for (i = ARRAY_SIZE(vou_scale_h_num) - 1; i >= 0; i--) {
		unsigned int err;
		unsigned int found = geo->output.width * vou_scale_h_den[i] /
			vou_scale_h_num[i];

		if (found > VOU_MAX_IMAGE_WIDTH)
			/* scales increase */
			break;

		err = abs(found - geo->in_width);
		if (err < best_err) {
			best_err = err;
			idx = i;
			best = found;
		}
		if (!err)
			break;
	}

	geo->in_width = best;
	geo->scale_idx_h = idx;

	best_err = UINT_MAX;

	/* This loop can be replaced with one division */
	for (i = ARRAY_SIZE(vou_scale_v_num) - 1; i >= 0; i--) {
		unsigned int err;
		unsigned int found = geo->output.height * vou_scale_v_den[i] /
			vou_scale_v_num[i];

		if (found > img_height_max)
			/* scales increase */
			break;

		err = abs(found - geo->in_height);
		if (err < best_err) {
			best_err = err;
			idx = i;
			best = found;
		}
		if (!err)
			break;
	}

	geo->in_height = best;
	geo->scale_idx_v = idx;
}

/*
 * Find output geometry, that we can produce, using VOU scaling, closest to
 * the requested rectangle
 */
static void vou_adjust_output(struct sh_vou_geometry *geo, v4l2_std_id std)
{
	unsigned int best_err = UINT_MAX, best, width_max, height_max,
		img_height_max;
	int i, idx;

	if (std & V4L2_STD_525_60) {
		width_max = 858;
		height_max = 262 * 2;
		img_height_max = 480;
	} else {
		width_max = 864;
		height_max = 312 * 2;
		img_height_max = 576;
	}

	/* Select scales to come as close as possible to the output image */
	for (i = 0; i < ARRAY_SIZE(vou_scale_h_num); i++) {
		unsigned int err;
		unsigned int found = geo->in_width * vou_scale_h_num[i] /
			vou_scale_h_den[i];

		if (found > VOU_MAX_IMAGE_WIDTH)
			/* scales increase */
			break;

		err = abs(found - geo->output.width);
		if (err < best_err) {
			best_err = err;
			idx = i;
			best = found;
		}
		if (!err)
			break;
	}

	geo->output.width = best;
	geo->scale_idx_h = idx;
	if (geo->output.left + best > width_max)
		geo->output.left = width_max - best;

	pr_debug("%s(): W %u * %u/%u = %u\n", __func__, geo->in_width,
		 vou_scale_h_num[idx], vou_scale_h_den[idx], best);

	best_err = UINT_MAX;

	/* This loop can be replaced with one division */
	for (i = 0; i < ARRAY_SIZE(vou_scale_v_num); i++) {
		unsigned int err;
		unsigned int found = geo->in_height * vou_scale_v_num[i] /
			vou_scale_v_den[i];

		if (found > img_height_max)
			/* scales increase */
			break;

		err = abs(found - geo->output.height);
		if (err < best_err) {
			best_err = err;
			idx = i;
			best = found;
		}
		if (!err)
			break;
	}

	geo->output.height = best;
	geo->scale_idx_v = idx;
	if (geo->output.top + best > height_max)
		geo->output.top = height_max - best;

	pr_debug("%s(): H %u * %u/%u = %u\n", __func__, geo->in_height,
		 vou_scale_v_num[idx], vou_scale_v_den[idx], best);
}

static int sh_vou_s_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct v4l2_pix_format *pix = &fmt->fmt.pix;
	unsigned int img_height_max;
	int pix_idx;
	struct sh_vou_geometry geo;
	struct v4l2_mbus_framefmt mbfmt = {
		/* Revisit: is this the correct code? */
		.code = V4L2_MBUS_FMT_YUYV8_2X8,
		.field = V4L2_FIELD_INTERLACED,
		.colorspace = V4L2_COLORSPACE_SMPTE170M,
	};
	int ret;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u -> %ux%u\n", __func__,
		vou_dev->rect.width, vou_dev->rect.height,
		pix->width, pix->height);

	if (pix->field == V4L2_FIELD_ANY)
		pix->field = V4L2_FIELD_NONE;

	if (fmt->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
	    pix->field != V4L2_FIELD_NONE)
		return -EINVAL;

	for (pix_idx = 0; pix_idx < ARRAY_SIZE(vou_fmt); pix_idx++)
		if (vou_fmt[pix_idx].pfmt == pix->pixelformat)
			break;

	if (pix_idx == ARRAY_SIZE(vou_fmt))
		return -EINVAL;

	if (vou_dev->std & V4L2_STD_525_60)
		img_height_max = 480;
	else
		img_height_max = 576;

	/* Image width must be a multiple of 4 */
	v4l_bound_align_image(&pix->width, 0, VOU_MAX_IMAGE_WIDTH, 2,
			      &pix->height, 0, img_height_max, 1, 0);

	geo.in_width = pix->width;
	geo.in_height = pix->height;
	geo.output = vou_dev->rect;

	vou_adjust_output(&geo, vou_dev->std);

	mbfmt.width = geo.output.width;
	mbfmt.height = geo.output.height;
	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
					 s_mbus_fmt, &mbfmt);
	/* Must be implemented, so, don't check for -ENOIOCTLCMD */
	if (ret < 0)
		return ret;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u -> %ux%u\n", __func__,
		geo.output.width, geo.output.height, mbfmt.width, mbfmt.height);

	/* Sanity checks */
	if ((unsigned)mbfmt.width > VOU_MAX_IMAGE_WIDTH ||
	    (unsigned)mbfmt.height > img_height_max ||
	    mbfmt.code != V4L2_MBUS_FMT_YUYV8_2X8)
		return -EIO;

	if (mbfmt.width != geo.output.width ||
	    mbfmt.height != geo.output.height) {
		geo.output.width = mbfmt.width;
		geo.output.height = mbfmt.height;

		vou_adjust_input(&geo, vou_dev->std);
	}

	/* We tried to preserve output rectangle, but it could have changed */
	vou_dev->rect = geo.output;
	pix->width = geo.in_width;
	pix->height = geo.in_height;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u\n", __func__,
		pix->width, pix->height);

	vou_dev->pix_idx = pix_idx;

	vou_dev->pix = *pix;

	sh_vou_configure_geometry(vou_dev, pix_idx,
				  geo.scale_idx_h, geo.scale_idx_v);

	return 0;
}

static int sh_vou_try_fmt_vid_out(struct file *file, void *priv,
				  struct v4l2_format *fmt)
{
	struct sh_vou_file *vou_file = priv;
	struct v4l2_pix_format *pix = &fmt->fmt.pix;
	int i;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	pix->field = V4L2_FIELD_NONE;

	v4l_bound_align_image(&pix->width, 0, VOU_MAX_IMAGE_WIDTH, 1,
			      &pix->height, 0, VOU_MAX_IMAGE_HEIGHT, 1, 0);

	for (i = 0; ARRAY_SIZE(vou_fmt); i++)
		if (vou_fmt[i].pfmt == pix->pixelformat)
			return 0;

	pix->pixelformat = vou_fmt[0].pfmt;

	return 0;
}

static int sh_vou_reqbufs(struct file *file, void *priv,
			  struct v4l2_requestbuffers *req)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	if (req->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
		return -EINVAL;

	return videobuf_reqbufs(&vou_file->vbq, req);
}

static int sh_vou_querybuf(struct file *file, void *priv,
			   struct v4l2_buffer *b)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	return videobuf_querybuf(&vou_file->vbq, b);
}

static int sh_vou_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	return videobuf_qbuf(&vou_file->vbq, b);
}

static int sh_vou_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	return videobuf_dqbuf(&vou_file->vbq, b, file->f_flags & O_NONBLOCK);
}

static int sh_vou_streamon(struct file *file, void *priv,
			   enum v4l2_buf_type buftype)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct sh_vou_file *vou_file = priv;
	int ret;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
					 video, s_stream, 1);
	if (ret < 0 && ret != -ENOIOCTLCMD)
		return ret;

	/* This calls our .buf_queue() (== sh_vou_buf_queue) */
	return videobuf_streamon(&vou_file->vbq);
}

static int sh_vou_streamoff(struct file *file, void *priv,
			    enum v4l2_buf_type buftype)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	/*
	 * This calls buf_release from host driver's videobuf_queue_ops for all
	 * remaining buffers. When the last buffer is freed, stop streaming
	 */
	videobuf_streamoff(&vou_file->vbq);
	v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video, s_stream, 0);

	return 0;
}

static u32 sh_vou_ntsc_mode(enum sh_vou_bus_fmt bus_fmt)
{
	switch (bus_fmt) {
	default:
		pr_warning("%s(): Invalid bus-format code %d, using default 8-bit\n",
			   __func__, bus_fmt);
	case SH_VOU_BUS_8BIT:
		return 1;
	case SH_VOU_BUS_16BIT:
		return 0;
	case SH_VOU_BUS_BT656:
		return 3;
	}
}

static int sh_vou_s_std(struct file *file, void *priv, v4l2_std_id *std_id)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	int ret;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): 0x%llx\n", __func__, *std_id);

	if (*std_id & ~vdev->tvnorms)
		return -EINVAL;

	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
					 s_std_output, *std_id);
	/* Shall we continue, if the subdev doesn't support .s_std_output()? */
	if (ret < 0 && ret != -ENOIOCTLCMD)
		return ret;

	if (*std_id & V4L2_STD_525_60)
		sh_vou_reg_ab_set(vou_dev, VOUCR,
			sh_vou_ntsc_mode(vou_dev->pdata->bus_fmt) << 29, 7 << 29);
	else
		sh_vou_reg_ab_set(vou_dev, VOUCR, 5 << 29, 7 << 29);

	vou_dev->std = *std_id;

	return 0;
}

static int sh_vou_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

	*std = vou_dev->std;

	return 0;
}

static int sh_vou_g_crop(struct file *file, void *fh, struct v4l2_crop *a)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

	a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	a->c = vou_dev->rect;

	return 0;
}

/* Assume a dull encoder, do all the work ourselves. */
static int sh_vou_s_crop(struct file *file, void *fh, struct v4l2_crop *a)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct v4l2_rect *rect = &a->c;
	struct v4l2_crop sd_crop = {.type = V4L2_BUF_TYPE_VIDEO_OUTPUT};
	struct v4l2_pix_format *pix = &vou_dev->pix;
	struct sh_vou_geometry geo;
	struct v4l2_mbus_framefmt mbfmt = {
		/* Revisit: is this the correct code? */
		.code = V4L2_MBUS_FMT_YUYV8_2X8,
		.field = V4L2_FIELD_INTERLACED,
		.colorspace = V4L2_COLORSPACE_SMPTE170M,
	};
	unsigned int img_height_max;
	int ret;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u@%u:%u\n", __func__,
		rect->width, rect->height, rect->left, rect->top);

	if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
		return -EINVAL;

	if (vou_dev->std & V4L2_STD_525_60)
		img_height_max = 480;
	else
		img_height_max = 576;

	v4l_bound_align_image(&rect->width, 0, VOU_MAX_IMAGE_WIDTH, 1,
			      &rect->height, 0, img_height_max, 1, 0);

	if (rect->width + rect->left > VOU_MAX_IMAGE_WIDTH)
		rect->left = VOU_MAX_IMAGE_WIDTH - rect->width;

	if (rect->height + rect->top > img_height_max)
		rect->top = img_height_max - rect->height;

	geo.output = *rect;
	geo.in_width = pix->width;
	geo.in_height = pix->height;

	/* Configure the encoder one-to-one, position at 0, ignore errors */
	sd_crop.c.width = geo.output.width;
	sd_crop.c.height = geo.output.height;
	/*
	 * We first issue a S_CROP, so that the subsequent S_FMT delivers the
	 * final encoder configuration.
	 */
	v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
				   s_crop, &sd_crop);
	mbfmt.width = geo.output.width;
	mbfmt.height = geo.output.height;
	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
					 s_mbus_fmt, &mbfmt);
	/* Must be implemented, so, don't check for -ENOIOCTLCMD */
	if (ret < 0)
		return ret;

	/* Sanity checks */
	if ((unsigned)mbfmt.width > VOU_MAX_IMAGE_WIDTH ||
	    (unsigned)mbfmt.height > img_height_max ||
	    mbfmt.code != V4L2_MBUS_FMT_YUYV8_2X8)
		return -EIO;

	geo.output.width = mbfmt.width;
	geo.output.height = mbfmt.height;

	/*
	 * No down-scaling. According to the API, current call has precedence:
	 * http://v4l2spec.bytesex.org/spec/x1904.htm#AEN1954 paragraph two.
	 */
	vou_adjust_input(&geo, vou_dev->std);

	/* We tried to preserve output rectangle, but it could have changed */
	vou_dev->rect = geo.output;
	pix->width = geo.in_width;
	pix->height = geo.in_height;

	sh_vou_configure_geometry(vou_dev, vou_dev->pix_idx,
				  geo.scale_idx_h, geo.scale_idx_v);

	return 0;
}

/*
 * Total field: NTSC 858 x 2 * 262/263, PAL 864 x 2 * 312/313, default rectangle
 * is the initial register values, height takes the interlaced format into
 * account. The actual image can only go up to 720 x 2 * 240, So, VOUVPR can
 * actually only meaningfully contain values <= 720 and <= 240 respectively, and
 * not <= 864 and <= 312.
 */
static int sh_vou_cropcap(struct file *file, void *priv,
			  struct v4l2_cropcap *a)
{
	struct sh_vou_file *vou_file = priv;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	a->type				= V4L2_BUF_TYPE_VIDEO_OUTPUT;
	a->bounds.left			= 0;
	a->bounds.top			= 0;
	a->bounds.width			= VOU_MAX_IMAGE_WIDTH;
	a->bounds.height		= VOU_MAX_IMAGE_HEIGHT;
	/* Default = max, set VOUDPR = 0, which is not hardware default */
	a->defrect.left			= 0;
	a->defrect.top			= 0;
	a->defrect.width		= VOU_MAX_IMAGE_WIDTH;
	a->defrect.height		= VOU_MAX_IMAGE_HEIGHT;
	a->pixelaspect.numerator	= 1;
	a->pixelaspect.denominator	= 1;

	return 0;
}

static irqreturn_t sh_vou_isr(int irq, void *dev_id)
{
	struct sh_vou_device *vou_dev = dev_id;
	static unsigned long j;
	struct videobuf_buffer *vb;
	static int cnt;
	static int side;
	u32 irq_status = sh_vou_reg_a_read(vou_dev, VOUIR), masked;
	u32 vou_status = sh_vou_reg_a_read(vou_dev, VOUSTR);

	if (!(irq_status & 0x300)) {
		if (printk_timed_ratelimit(&j, 500))
			dev_warn(vou_dev->v4l2_dev.dev, "IRQ status 0x%x!\n",
				 irq_status);
		return IRQ_NONE;
	}

	spin_lock(&vou_dev->lock);
	if (!vou_dev->active || list_empty(&vou_dev->queue)) {
		if (printk_timed_ratelimit(&j, 500))
			dev_warn(vou_dev->v4l2_dev.dev,
				 "IRQ without active buffer: %x!\n", irq_status);
		/* Just ack: buf_release will disable further interrupts */
		sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x300);
		spin_unlock(&vou_dev->lock);
		return IRQ_HANDLED;
	}

	masked = ~(0x300 & irq_status) & irq_status & 0x30304;
	dev_dbg(vou_dev->v4l2_dev.dev,
		"IRQ status 0x%x -> 0x%x, VOU status 0x%x, cnt %d\n",
		irq_status, masked, vou_status, cnt);

	cnt++;
	side = vou_status & 0x10000;

	/* Clear only set interrupts */
	sh_vou_reg_a_write(vou_dev, VOUIR, masked);

	vb = vou_dev->active;
	list_del(&vb->queue);

	vb->state = VIDEOBUF_DONE;
	do_gettimeofday(&vb->ts);
	vb->field_count++;
	wake_up(&vb->done);

	if (list_empty(&vou_dev->queue)) {
		/* Stop VOU */
		dev_dbg(vou_dev->v4l2_dev.dev, "%s: queue empty after %d\n",
			__func__, cnt);
		sh_vou_reg_a_set(vou_dev, VOUER, 0, 1);
		vou_dev->active = NULL;
		vou_dev->status = SH_VOU_INITIALISING;
		/* Disable End-of-Frame (VSYNC) interrupts */
		sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x30000);
		spin_unlock(&vou_dev->lock);
		return IRQ_HANDLED;
	}

	vou_dev->active = list_entry(vou_dev->queue.next,
				     struct videobuf_buffer, queue);

	if (vou_dev->active->queue.next != &vou_dev->queue) {
		struct videobuf_buffer *new = list_entry(vou_dev->active->queue.next,
						struct videobuf_buffer, queue);
		sh_vou_schedule_next(vou_dev, new);
	}

	spin_unlock(&vou_dev->lock);

	return IRQ_HANDLED;
}

static int sh_vou_hw_init(struct sh_vou_device *vou_dev)
{
	struct sh_vou_pdata *pdata = vou_dev->pdata;
	u32 voucr = sh_vou_ntsc_mode(pdata->bus_fmt) << 29;
	int i = 100;

	/* Disable all IRQs */
	sh_vou_reg_a_write(vou_dev, VOUIR, 0);

	/* Reset VOU interfaces - registers unaffected */
	sh_vou_reg_a_write(vou_dev, VOUSRR, 0x101);
	while (--i && (sh_vou_reg_a_read(vou_dev, VOUSRR) & 0x101))
		udelay(1);

	if (!i)
		return -ETIMEDOUT;

	dev_dbg(vou_dev->v4l2_dev.dev, "Reset took %dus\n", 100 - i);

	if (pdata->flags & SH_VOU_PCLK_FALLING)
		voucr |= 1 << 28;
	if (pdata->flags & SH_VOU_HSYNC_LOW)
		voucr |= 1 << 27;
	if (pdata->flags & SH_VOU_VSYNC_LOW)
		voucr |= 1 << 26;
	sh_vou_reg_ab_set(vou_dev, VOUCR, voucr, 0xfc000000);

	/* Manual register side switching at first */
	sh_vou_reg_a_write(vou_dev, VOURCR, 4);
	/* Default - fixed HSYNC length, can be made configurable is required */
	sh_vou_reg_ab_write(vou_dev, VOUMSR, 0x800000);

	return 0;
}

/* File operations */
static int sh_vou_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct sh_vou_file *vou_file = kzalloc(sizeof(struct sh_vou_file),
					       GFP_KERNEL);

	if (!vou_file)
		return -ENOMEM;

	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

	file->private_data = vou_file;

	if (atomic_inc_return(&vou_dev->use_count) == 1) {
		int ret;
		/* First open */
		vou_dev->status = SH_VOU_INITIALISING;
		pm_runtime_get_sync(vdev->v4l2_dev->dev);
		ret = sh_vou_hw_init(vou_dev);
		if (ret < 0) {
			atomic_dec(&vou_dev->use_count);
			pm_runtime_put(vdev->v4l2_dev->dev);
			vou_dev->status = SH_VOU_IDLE;
			return ret;
		}
	}

	videobuf_queue_dma_contig_init(&vou_file->vbq, &sh_vou_video_qops,
				       vou_dev->v4l2_dev.dev, &vou_dev->lock,
				       V4L2_BUF_TYPE_VIDEO_OUTPUT,
				       V4L2_FIELD_NONE,
				       sizeof(struct videobuf_buffer), vdev,
				       &vou_dev->fop_lock);

	return 0;
}

static int sh_vou_release(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
	struct sh_vou_file *vou_file = file->private_data;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	if (!atomic_dec_return(&vou_dev->use_count)) {
		/* Last close */
		vou_dev->status = SH_VOU_IDLE;
		sh_vou_reg_a_set(vou_dev, VOUER, 0, 0x101);
		pm_runtime_put(vdev->v4l2_dev->dev);
	}

	file->private_data = NULL;
	kfree(vou_file);

	return 0;
}

static int sh_vou_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct sh_vou_file *vou_file = file->private_data;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	return videobuf_mmap_mapper(&vou_file->vbq, vma);
}

static unsigned int sh_vou_poll(struct file *file, poll_table *wait)
{
	struct sh_vou_file *vou_file = file->private_data;

	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);

	return videobuf_poll_stream(file, &vou_file->vbq, wait);
}

static int sh_vou_g_chip_ident(struct file *file, void *fh,
				   struct v4l2_dbg_chip_ident *id)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, g_chip_ident, id);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int sh_vou_g_register(struct file *file, void *fh,
				 struct v4l2_dbg_register *reg)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, g_register, reg);
}

static int sh_vou_s_register(struct file *file, void *fh,
				 struct v4l2_dbg_register *reg)
{
	struct video_device *vdev = video_devdata(file);
	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, s_register, reg);
}
#endif

/* sh_vou display ioctl operations */
static const struct v4l2_ioctl_ops sh_vou_ioctl_ops = {
	.vidioc_querycap        	= sh_vou_querycap,
	.vidioc_enum_fmt_vid_out	= sh_vou_enum_fmt_vid_out,
	.vidioc_g_fmt_vid_out		= sh_vou_g_fmt_vid_out,
	.vidioc_s_fmt_vid_out		= sh_vou_s_fmt_vid_out,
	.vidioc_try_fmt_vid_out		= sh_vou_try_fmt_vid_out,
	.vidioc_reqbufs			= sh_vou_reqbufs,
	.vidioc_querybuf		= sh_vou_querybuf,
	.vidioc_qbuf			= sh_vou_qbuf,
	.vidioc_dqbuf			= sh_vou_dqbuf,
	.vidioc_streamon		= sh_vou_streamon,
	.vidioc_streamoff		= sh_vou_streamoff,
	.vidioc_s_std			= sh_vou_s_std,
	.vidioc_g_std			= sh_vou_g_std,
	.vidioc_cropcap			= sh_vou_cropcap,
	.vidioc_g_crop			= sh_vou_g_crop,
	.vidioc_s_crop			= sh_vou_s_crop,
	.vidioc_g_chip_ident		= sh_vou_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register		= sh_vou_g_register,
	.vidioc_s_register		= sh_vou_s_register,
#endif
};

static const struct v4l2_file_operations sh_vou_fops = {
	.owner		= THIS_MODULE,
	.open		= sh_vou_open,
	.release	= sh_vou_release,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= sh_vou_mmap,
	.poll		= sh_vou_poll,
};

static const struct video_device sh_vou_video_template = {
	.name		= "sh_vou",
	.fops		= &sh_vou_fops,
	.ioctl_ops	= &sh_vou_ioctl_ops,
	.tvnorms	= V4L2_STD_525_60, /* PAL only supported in 8-bit non-bt656 mode */
	.current_norm	= V4L2_STD_NTSC_M,
};

static int __devinit sh_vou_probe(struct platform_device *pdev)
{
	struct sh_vou_pdata *vou_pdata = pdev->dev.platform_data;
	struct v4l2_rect *rect;
	struct v4l2_pix_format *pix;
	struct i2c_adapter *i2c_adap;
	struct video_device *vdev;
	struct sh_vou_device *vou_dev;
	struct resource *reg_res, *region;
	struct v4l2_subdev *subdev;
	int irq, ret;

	reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);

	if (!vou_pdata || !reg_res || irq <= 0) {
		dev_err(&pdev->dev, "Insufficient VOU platform information.\n");
		return -ENODEV;
	}

	vou_dev = kzalloc(sizeof(*vou_dev), GFP_KERNEL);
	if (!vou_dev)
		return -ENOMEM;

	INIT_LIST_HEAD(&vou_dev->queue);
	spin_lock_init(&vou_dev->lock);
	mutex_init(&vou_dev->fop_lock);
	atomic_set(&vou_dev->use_count, 0);
	vou_dev->pdata = vou_pdata;
	vou_dev->status = SH_VOU_IDLE;

	rect = &vou_dev->rect;
	pix = &vou_dev->pix;

	/* Fill in defaults */
	vou_dev->std		= sh_vou_video_template.current_norm;
	rect->left		= 0;
	rect->top		= 0;
	rect->width		= VOU_MAX_IMAGE_WIDTH;
	rect->height		= 480;
	pix->width		= VOU_MAX_IMAGE_WIDTH;
	pix->height		= 480;
	pix->pixelformat	= V4L2_PIX_FMT_YVYU;
	pix->field		= V4L2_FIELD_NONE;
	pix->bytesperline	= VOU_MAX_IMAGE_WIDTH * 2;
	pix->sizeimage		= VOU_MAX_IMAGE_WIDTH * 2 * 480;
	pix->colorspace		= V4L2_COLORSPACE_SMPTE170M;

	region = request_mem_region(reg_res->start, resource_size(reg_res),
				    pdev->name);
	if (!region) {
		dev_err(&pdev->dev, "VOU region already claimed\n");
		ret = -EBUSY;
		goto ereqmemreg;
	}

	vou_dev->base = ioremap(reg_res->start, resource_size(reg_res));
	if (!vou_dev->base) {
		ret = -ENOMEM;
		goto emap;
	}

	ret = request_irq(irq, sh_vou_isr, 0, "vou", vou_dev);
	if (ret < 0)
		goto ereqirq;

	ret = v4l2_device_register(&pdev->dev, &vou_dev->v4l2_dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "Error registering v4l2 device\n");
		goto ev4l2devreg;
	}

	/* Allocate memory for video device */
	vdev = video_device_alloc();
	if (vdev == NULL) {
		ret = -ENOMEM;
		goto evdevalloc;
	}

	*vdev = sh_vou_video_template;
	if (vou_pdata->bus_fmt == SH_VOU_BUS_8BIT)
		vdev->tvnorms |= V4L2_STD_PAL;
	vdev->v4l2_dev = &vou_dev->v4l2_dev;
	vdev->release = video_device_release;
	vdev->lock = &vou_dev->fop_lock;

	vou_dev->vdev = vdev;
	video_set_drvdata(vdev, vou_dev);

	pm_runtime_enable(&pdev->dev);
	pm_runtime_resume(&pdev->dev);

	i2c_adap = i2c_get_adapter(vou_pdata->i2c_adap);
	if (!i2c_adap) {
		ret = -ENODEV;
		goto ei2cgadap;
	}

	ret = sh_vou_hw_init(vou_dev);
	if (ret < 0)
		goto ereset;

	subdev = v4l2_i2c_new_subdev_board(&vou_dev->v4l2_dev, i2c_adap,
			vou_pdata->board_info, NULL);
	if (!subdev) {
		ret = -ENOMEM;
		goto ei2cnd;
	}

	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
	if (ret < 0)
		goto evregdev;

	return 0;

evregdev:
ei2cnd:
ereset:
	i2c_put_adapter(i2c_adap);
ei2cgadap:
	video_device_release(vdev);
	pm_runtime_disable(&pdev->dev);
evdevalloc:
	v4l2_device_unregister(&vou_dev->v4l2_dev);
ev4l2devreg:
	free_irq(irq, vou_dev);
ereqirq:
	iounmap(vou_dev->base);
emap:
	release_mem_region(reg_res->start, resource_size(reg_res));
ereqmemreg:
	kfree(vou_dev);
	return ret;
}

static int __devexit sh_vou_remove(struct platform_device *pdev)
{
	int irq = platform_get_irq(pdev, 0);
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct sh_vou_device *vou_dev = container_of(v4l2_dev,
						struct sh_vou_device, v4l2_dev);
	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
					    struct v4l2_subdev, list);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct resource *reg_res;

	if (irq > 0)
		free_irq(irq, vou_dev);
	pm_runtime_disable(&pdev->dev);
	video_unregister_device(vou_dev->vdev);
	i2c_put_adapter(client->adapter);
	v4l2_device_unregister(&vou_dev->v4l2_dev);
	iounmap(vou_dev->base);
	reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (reg_res)
		release_mem_region(reg_res->start, resource_size(reg_res));
	kfree(vou_dev);
	return 0;
}

static struct platform_driver __refdata sh_vou = {
	.remove  = __devexit_p(sh_vou_remove),
	.driver  = {
		.name	= "sh-vou",
		.owner	= THIS_MODULE,
	},
};

static int __init sh_vou_init(void)
{
	return platform_driver_probe(&sh_vou, sh_vou_probe);
}

static void __exit sh_vou_exit(void)
{
	platform_driver_unregister(&sh_vou);
}

module_init(sh_vou_init);
module_exit(sh_vou_exit);

MODULE_DESCRIPTION("SuperH VOU driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1.0");
MODULE_ALIAS("platform:sh-vou");