summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/atmel/atmel-isi.c
blob: e392b3efe363322f21a2f2a456b6b3b23777be4a (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
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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2011 Atmel Corporation
 * Josh Wu, <josh.wu@atmel.com>
 *
 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
 * and Sedji Gaouaou
 * Based on the bttv driver for Bt848 with respective copyright holders
 */

#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/videobuf2-dma-contig.h>
#include <media/v4l2-image-sizes.h>

#include "atmel-isi.h"

#define MAX_SUPPORT_WIDTH		2048U
#define MAX_SUPPORT_HEIGHT		2048U
#define MIN_FRAME_RATE			15
#define FRAME_INTERVAL_MILLI_SEC	(1000 / MIN_FRAME_RATE)

/* Frame buffer descriptor */
struct fbd {
	/* Physical address of the frame buffer */
	u32 fb_address;
	/* DMA Control Register(only in HISI2) */
	u32 dma_ctrl;
	/* Physical address of the next fbd */
	u32 next_fbd_address;
};

static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
{
	fb_desc->dma_ctrl = ctrl;
}

struct isi_dma_desc {
	struct list_head list;
	struct fbd *p_fbd;
	dma_addr_t fbd_phys;
};

/* Frame buffer data */
struct frame_buffer {
	struct vb2_v4l2_buffer vb;
	struct isi_dma_desc *p_dma_desc;
	struct list_head list;
};

struct isi_graph_entity {
	struct device_node *node;

	struct v4l2_subdev *subdev;
};

/*
 * struct isi_format - ISI media bus format information
 * @fourcc:		Fourcc code for this format
 * @mbus_code:		V4L2 media bus format code.
 * @bpp:		Bytes per pixel (when stored in memory)
 * @swap:		Byte swap configuration value
 * @support:		Indicates format supported by subdev
 * @skip:		Skip duplicate format supported by subdev
 */
struct isi_format {
	u32	fourcc;
	u32	mbus_code;
	u8	bpp;
	u32	swap;
};


struct atmel_isi {
	/* Protects the access of variables shared with the ISR */
	spinlock_t			irqlock;
	struct device			*dev;
	void __iomem			*regs;

	int				sequence;

	/* Allocate descriptors for dma buffer use */
	struct fbd			*p_fb_descriptors;
	dma_addr_t			fb_descriptors_phys;
	struct				list_head dma_desc_head;
	struct isi_dma_desc		dma_desc[VIDEO_MAX_FRAME];
	bool				enable_preview_path;

	struct completion		complete;
	/* ISI peripheral clock */
	struct clk			*pclk;
	unsigned int			irq;

	struct isi_platform_data	pdata;
	u16				width_flags;	/* max 12 bits */

	struct list_head		video_buffer_list;
	struct frame_buffer		*active;

	struct v4l2_device		v4l2_dev;
	struct video_device		*vdev;
	struct v4l2_async_notifier	notifier;
	struct isi_graph_entity		entity;
	struct v4l2_format		fmt;

	const struct isi_format		**user_formats;
	unsigned int			num_user_formats;
	const struct isi_format		*current_fmt;

	struct mutex			lock;
	struct vb2_queue		queue;
};

#define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)

static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
{
	writel(val, isi->regs + reg);
}
static u32 isi_readl(struct atmel_isi *isi, u32 reg)
{
	return readl(isi->regs + reg);
}

static void configure_geometry(struct atmel_isi *isi)
{
	u32 cfg2, psize;
	u32 fourcc = isi->current_fmt->fourcc;

	isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
				   fourcc == V4L2_PIX_FMT_RGB32 ||
				   fourcc == V4L2_PIX_FMT_Y16;

	/* According to sensor's output format to set cfg2 */
	cfg2 = isi->current_fmt->swap;

	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
	/* Set width */
	cfg2 |= ((isi->fmt.fmt.pix.width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
			ISI_CFG2_IM_HSIZE_MASK;
	/* Set height */
	cfg2 |= ((isi->fmt.fmt.pix.height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
			& ISI_CFG2_IM_VSIZE_MASK;
	isi_writel(isi, ISI_CFG2, cfg2);

	/* No down sampling, preview size equal to sensor output size */
	psize = ((isi->fmt.fmt.pix.width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
		ISI_PSIZE_PREV_HSIZE_MASK;
	psize |= ((isi->fmt.fmt.pix.height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
		ISI_PSIZE_PREV_VSIZE_MASK;
	isi_writel(isi, ISI_PSIZE, psize);
	isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
}

static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
{
	if (isi->active) {
		struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
		struct frame_buffer *buf = isi->active;

		list_del_init(&buf->list);
		vbuf->vb2_buf.timestamp = ktime_get_ns();
		vbuf->sequence = isi->sequence++;
		vbuf->field = V4L2_FIELD_NONE;
		vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
	}

	if (list_empty(&isi->video_buffer_list)) {
		isi->active = NULL;
	} else {
		/* start next dma frame. */
		isi->active = list_entry(isi->video_buffer_list.next,
					struct frame_buffer, list);
		if (!isi->enable_preview_path) {
			isi_writel(isi, ISI_DMA_C_DSCR,
				(u32)isi->active->p_dma_desc->fbd_phys);
			isi_writel(isi, ISI_DMA_C_CTRL,
				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
			isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
		} else {
			isi_writel(isi, ISI_DMA_P_DSCR,
				(u32)isi->active->p_dma_desc->fbd_phys);
			isi_writel(isi, ISI_DMA_P_CTRL,
				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
			isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
		}
	}
	return IRQ_HANDLED;
}

/* ISI interrupt service routine */
static irqreturn_t isi_interrupt(int irq, void *dev_id)
{
	struct atmel_isi *isi = dev_id;
	u32 status, mask, pending;
	irqreturn_t ret = IRQ_NONE;

	spin_lock(&isi->irqlock);

	status = isi_readl(isi, ISI_STATUS);
	mask = isi_readl(isi, ISI_INTMASK);
	pending = status & mask;

	if (pending & ISI_CTRL_SRST) {
		complete(&isi->complete);
		isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
		ret = IRQ_HANDLED;
	} else if (pending & ISI_CTRL_DIS) {
		complete(&isi->complete);
		isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
		ret = IRQ_HANDLED;
	} else {
		if (likely(pending & ISI_SR_CXFR_DONE) ||
				likely(pending & ISI_SR_PXFR_DONE))
			ret = atmel_isi_handle_streaming(isi);
	}

	spin_unlock(&isi->irqlock);
	return ret;
}

#define	WAIT_ISI_RESET		1
#define	WAIT_ISI_DISABLE	0
static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
{
	unsigned long timeout;
	/*
	 * The reset or disable will only succeed if we have a
	 * pixel clock from the camera.
	 */
	init_completion(&isi->complete);

	if (wait_reset) {
		isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
		isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
	} else {
		isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
		isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
	}

	timeout = wait_for_completion_timeout(&isi->complete,
			msecs_to_jiffies(500));
	if (timeout == 0)
		return -ETIMEDOUT;

	return 0;
}

/* ------------------------------------------------------------------
	Videobuf operations
   ------------------------------------------------------------------*/
static int queue_setup(struct vb2_queue *vq,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], struct device *alloc_devs[])
{
	struct atmel_isi *isi = vb2_get_drv_priv(vq);
	unsigned long size;

	size = isi->fmt.fmt.pix.sizeimage;

	/* Make sure the image size is large enough. */
	if (*nplanes)
		return sizes[0] < size ? -EINVAL : 0;

	*nplanes = 1;
	sizes[0] = size;

	isi->active = NULL;

	dev_dbg(isi->dev, "%s, count=%d, size=%ld\n", __func__,
		*nbuffers, size);

	return 0;
}

static int buffer_init(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);

	buf->p_dma_desc = NULL;
	INIT_LIST_HEAD(&buf->list);

	return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
	unsigned long size;
	struct isi_dma_desc *desc;

	size = isi->fmt.fmt.pix.sizeimage;

	if (vb2_plane_size(vb, 0) < size) {
		dev_err(isi->dev, "%s data will not fit into plane (%lu < %lu)\n",
				__func__, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}

	vb2_set_plane_payload(vb, 0, size);

	if (!buf->p_dma_desc) {
		if (list_empty(&isi->dma_desc_head)) {
			dev_err(isi->dev, "Not enough dma descriptors.\n");
			return -EINVAL;
		} else {
			/* Get an available descriptor */
			desc = list_entry(isi->dma_desc_head.next,
						struct isi_dma_desc, list);
			/* Delete the descriptor since now it is used */
			list_del_init(&desc->list);

			/* Initialize the dma descriptor */
			desc->p_fbd->fb_address =
					vb2_dma_contig_plane_dma_addr(vb, 0);
			desc->p_fbd->next_fbd_address = 0;
			set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);

			buf->p_dma_desc = desc;
		}
	}
	return 0;
}

static void buffer_cleanup(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);

	/* This descriptor is available now and we add to head list */
	if (buf->p_dma_desc)
		list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
}

static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
{
	u32 ctrl, cfg1;

	cfg1 = isi_readl(isi, ISI_CFG1);
	/* Enable irq: cxfr for the codec path, pxfr for the preview path */
	isi_writel(isi, ISI_INTEN,
			ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);

	/* Check if already in a frame */
	if (!isi->enable_preview_path) {
		if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
			dev_err(isi->dev, "Already in frame handling.\n");
			return;
		}

		isi_writel(isi, ISI_DMA_C_DSCR,
				(u32)buffer->p_dma_desc->fbd_phys);
		isi_writel(isi, ISI_DMA_C_CTRL,
				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
		isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
	} else {
		isi_writel(isi, ISI_DMA_P_DSCR,
				(u32)buffer->p_dma_desc->fbd_phys);
		isi_writel(isi, ISI_DMA_P_CTRL,
				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
		isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
	}

	cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
	/* Enable linked list */
	cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;

	/* Enable ISI */
	ctrl = ISI_CTRL_EN;

	if (!isi->enable_preview_path)
		ctrl |= ISI_CTRL_CDC;

	isi_writel(isi, ISI_CTRL, ctrl);
	isi_writel(isi, ISI_CFG1, cfg1);
}

static void buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
	unsigned long flags = 0;

	spin_lock_irqsave(&isi->irqlock, flags);
	list_add_tail(&buf->list, &isi->video_buffer_list);

	if (!isi->active) {
		isi->active = buf;
		if (vb2_is_streaming(vb->vb2_queue))
			start_dma(isi, buf);
	}
	spin_unlock_irqrestore(&isi->irqlock, flags);
}

static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct atmel_isi *isi = vb2_get_drv_priv(vq);
	struct frame_buffer *buf, *node;
	int ret;

	pm_runtime_get_sync(isi->dev);

	/* Enable stream on the sub device */
	ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
	if (ret && ret != -ENOIOCTLCMD) {
		dev_err(isi->dev, "stream on failed in subdev\n");
		goto err_start_stream;
	}

	/* Reset ISI */
	ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
	if (ret < 0) {
		dev_err(isi->dev, "Reset ISI timed out\n");
		goto err_reset;
	}
	/* Disable all interrupts */
	isi_writel(isi, ISI_INTDIS, (u32)~0UL);

	isi->sequence = 0;
	configure_geometry(isi);

	spin_lock_irq(&isi->irqlock);
	/* Clear any pending interrupt */
	isi_readl(isi, ISI_STATUS);

	start_dma(isi, isi->active);
	spin_unlock_irq(&isi->irqlock);

	return 0;

err_reset:
	v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);

err_start_stream:
	pm_runtime_put(isi->dev);

	spin_lock_irq(&isi->irqlock);
	isi->active = NULL;
	/* Release all active buffers */
	list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
		list_del_init(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
	}
	spin_unlock_irq(&isi->irqlock);

	return ret;
}

/* abort streaming and wait for last buffer */
static void stop_streaming(struct vb2_queue *vq)
{
	struct atmel_isi *isi = vb2_get_drv_priv(vq);
	struct frame_buffer *buf, *node;
	int ret = 0;
	unsigned long timeout;

	/* Disable stream on the sub device */
	ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
	if (ret && ret != -ENOIOCTLCMD)
		dev_err(isi->dev, "stream off failed in subdev\n");

	spin_lock_irq(&isi->irqlock);
	isi->active = NULL;
	/* Release all active buffers */
	list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
		list_del_init(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
	}
	spin_unlock_irq(&isi->irqlock);

	if (!isi->enable_preview_path) {
		timeout = jiffies + (FRAME_INTERVAL_MILLI_SEC * HZ) / 1000;
		/* Wait until the end of the current frame. */
		while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
				time_before(jiffies, timeout))
			msleep(1);

		if (time_after(jiffies, timeout))
			dev_err(isi->dev,
				"Timeout waiting for finishing codec request\n");
	}

	/* Disable interrupts */
	isi_writel(isi, ISI_INTDIS,
			ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);

	/* Disable ISI and wait for it is done */
	ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
	if (ret < 0)
		dev_err(isi->dev, "Disable ISI timed out\n");

	pm_runtime_put(isi->dev);
}

static const struct vb2_ops isi_video_qops = {
	.queue_setup		= queue_setup,
	.buf_init		= buffer_init,
	.buf_prepare		= buffer_prepare,
	.buf_cleanup		= buffer_cleanup,
	.buf_queue		= buffer_queue,
	.start_streaming	= start_streaming,
	.stop_streaming		= stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

static int isi_g_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *fmt)
{
	struct atmel_isi *isi = video_drvdata(file);

	*fmt = isi->fmt;

	return 0;
}

static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
						      unsigned int fourcc)
{
	unsigned int num_formats = isi->num_user_formats;
	const struct isi_format *fmt;
	unsigned int i;

	for (i = 0; i < num_formats; i++) {
		fmt = isi->user_formats[i];
		if (fmt->fourcc == fourcc)
			return fmt;
	}

	return NULL;
}

static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
			struct v4l2_subdev_pad_config *pad_cfg)
{
	int ret;
	struct v4l2_subdev_frame_size_enum fse = {
		.code = isi_fmt->mbus_code,
		.which = V4L2_SUBDEV_FORMAT_TRY,
	};

	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
			       pad_cfg, &fse);
	/*
	 * Attempt to obtain format size from subdev. If not available,
	 * just use the maximum ISI can receive.
	 */
	if (ret) {
		pad_cfg->try_crop.width = MAX_SUPPORT_WIDTH;
		pad_cfg->try_crop.height = MAX_SUPPORT_HEIGHT;
	} else {
		pad_cfg->try_crop.width = fse.max_width;
		pad_cfg->try_crop.height = fse.max_height;
	}
}

static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
		       const struct isi_format **current_fmt)
{
	const struct isi_format *isi_fmt;
	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
	struct v4l2_subdev_pad_config pad_cfg = {};
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_TRY,
	};
	int ret;

	isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
	if (!isi_fmt) {
		isi_fmt = isi->user_formats[isi->num_user_formats - 1];
		pixfmt->pixelformat = isi_fmt->fourcc;
	}

	/* Limit to Atmel ISI hardware capabilities */
	pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
	pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);

	v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);

	isi_try_fse(isi, isi_fmt, &pad_cfg);

	ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
			       &pad_cfg, &format);
	if (ret < 0)
		return ret;

	v4l2_fill_pix_format(pixfmt, &format.format);

	pixfmt->field = V4L2_FIELD_NONE;
	pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;

	if (current_fmt)
		*current_fmt = isi_fmt;

	return 0;
}

static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
{
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	const struct isi_format *current_fmt;
	int ret;

	ret = isi_try_fmt(isi, f, &current_fmt);
	if (ret)
		return ret;

	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
			      current_fmt->mbus_code);
	ret = v4l2_subdev_call(isi->entity.subdev, pad,
			       set_fmt, NULL, &format);
	if (ret < 0)
		return ret;

	isi->fmt = *f;
	isi->current_fmt = current_fmt;

	return 0;
}

static int isi_s_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct atmel_isi *isi = video_drvdata(file);

	if (vb2_is_streaming(&isi->queue))
		return -EBUSY;

	return isi_set_fmt(isi, f);
}

static int isi_try_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct atmel_isi *isi = video_drvdata(file);

	return isi_try_fmt(isi, f, NULL);
}

static int isi_enum_fmt_vid_cap(struct file *file, void  *priv,
				struct v4l2_fmtdesc *f)
{
	struct atmel_isi *isi = video_drvdata(file);

	if (f->index >= isi->num_user_formats)
		return -EINVAL;

	f->pixelformat = isi->user_formats[f->index]->fourcc;
	return 0;
}

static int isi_querycap(struct file *file, void *priv,
			struct v4l2_capability *cap)
{
	strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
	strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
	strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
	return 0;
}

static int isi_enum_input(struct file *file, void *priv,
			   struct v4l2_input *i)
{
	if (i->index != 0)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	strscpy(i->name, "Camera", sizeof(i->name));
	return 0;
}

static int isi_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int isi_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i > 0)
		return -EINVAL;
	return 0;
}

static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
{
	struct atmel_isi *isi = video_drvdata(file);

	return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
}

static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
{
	struct atmel_isi *isi = video_drvdata(file);

	return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
}

static int isi_enum_framesizes(struct file *file, void *fh,
			       struct v4l2_frmsizeenum *fsize)
{
	struct atmel_isi *isi = video_drvdata(file);
	const struct isi_format *isi_fmt;
	struct v4l2_subdev_frame_size_enum fse = {
		.index = fsize->index,
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	int ret;

	isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
	if (!isi_fmt)
		return -EINVAL;

	fse.code = isi_fmt->mbus_code;

	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
			       NULL, &fse);
	if (ret)
		return ret;

	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
	fsize->discrete.width = fse.max_width;
	fsize->discrete.height = fse.max_height;

	return 0;
}

static int isi_enum_frameintervals(struct file *file, void *fh,
				    struct v4l2_frmivalenum *fival)
{
	struct atmel_isi *isi = video_drvdata(file);
	const struct isi_format *isi_fmt;
	struct v4l2_subdev_frame_interval_enum fie = {
		.index = fival->index,
		.width = fival->width,
		.height = fival->height,
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	int ret;

	isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
	if (!isi_fmt)
		return -EINVAL;

	fie.code = isi_fmt->mbus_code;

	ret = v4l2_subdev_call(isi->entity.subdev, pad,
			       enum_frame_interval, NULL, &fie);
	if (ret)
		return ret;

	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
	fival->discrete = fie.interval;

	return 0;
}

static void isi_camera_set_bus_param(struct atmel_isi *isi)
{
	u32 cfg1 = 0;

	/* set bus param for ISI */
	if (isi->pdata.hsync_act_low)
		cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
	if (isi->pdata.vsync_act_low)
		cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
	if (isi->pdata.pclk_act_falling)
		cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
	if (isi->pdata.has_emb_sync)
		cfg1 |= ISI_CFG1_EMB_SYNC;
	if (isi->pdata.full_mode)
		cfg1 |= ISI_CFG1_FULL_MODE;

	cfg1 |= ISI_CFG1_THMASK_BEATS_16;

	/* Enable PM and peripheral clock before operate isi registers */
	pm_runtime_get_sync(isi->dev);

	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
	isi_writel(isi, ISI_CFG1, cfg1);

	pm_runtime_put(isi->dev);
}

/* -----------------------------------------------------------------------*/
static int atmel_isi_parse_dt(struct atmel_isi *isi,
			struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
	int err;

	/* Default settings for ISI */
	isi->pdata.full_mode = 1;
	isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;

	np = of_graph_get_next_endpoint(np, NULL);
	if (!np) {
		dev_err(&pdev->dev, "Could not find the endpoint\n");
		return -EINVAL;
	}

	err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
	of_node_put(np);
	if (err) {
		dev_err(&pdev->dev, "Could not parse the endpoint\n");
		return err;
	}

	switch (ep.bus.parallel.bus_width) {
	case 8:
		isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
		break;
	case 10:
		isi->pdata.data_width_flags =
				ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
		break;
	default:
		dev_err(&pdev->dev, "Unsupported bus width: %d\n",
				ep.bus.parallel.bus_width);
		return -EINVAL;
	}

	if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
		isi->pdata.hsync_act_low = true;
	if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
		isi->pdata.vsync_act_low = true;
	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
		isi->pdata.pclk_act_falling = true;

	if (ep.bus_type == V4L2_MBUS_BT656)
		isi->pdata.has_emb_sync = true;

	return 0;
}

static int isi_open(struct file *file)
{
	struct atmel_isi *isi = video_drvdata(file);
	struct v4l2_subdev *sd = isi->entity.subdev;
	int ret;

	if (mutex_lock_interruptible(&isi->lock))
		return -ERESTARTSYS;

	ret = v4l2_fh_open(file);
	if (ret < 0)
		goto unlock;

	if (!v4l2_fh_is_singular_file(file))
		goto fh_rel;

	ret = v4l2_subdev_call(sd, core, s_power, 1);
	if (ret < 0 && ret != -ENOIOCTLCMD)
		goto fh_rel;

	ret = isi_set_fmt(isi, &isi->fmt);
	if (ret)
		v4l2_subdev_call(sd, core, s_power, 0);
fh_rel:
	if (ret)
		v4l2_fh_release(file);
unlock:
	mutex_unlock(&isi->lock);
	return ret;
}

static int isi_release(struct file *file)
{
	struct atmel_isi *isi = video_drvdata(file);
	struct v4l2_subdev *sd = isi->entity.subdev;
	bool fh_singular;
	int ret;

	mutex_lock(&isi->lock);

	fh_singular = v4l2_fh_is_singular_file(file);

	ret = _vb2_fop_release(file, NULL);

	if (fh_singular)
		v4l2_subdev_call(sd, core, s_power, 0);

	mutex_unlock(&isi->lock);

	return ret;
}

static const struct v4l2_ioctl_ops isi_ioctl_ops = {
	.vidioc_querycap		= isi_querycap,

	.vidioc_try_fmt_vid_cap		= isi_try_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap		= isi_g_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		= isi_s_fmt_vid_cap,
	.vidioc_enum_fmt_vid_cap	= isi_enum_fmt_vid_cap,

	.vidioc_enum_input		= isi_enum_input,
	.vidioc_g_input			= isi_g_input,
	.vidioc_s_input			= isi_s_input,

	.vidioc_g_parm			= isi_g_parm,
	.vidioc_s_parm			= isi_s_parm,
	.vidioc_enum_framesizes		= isi_enum_framesizes,
	.vidioc_enum_frameintervals	= isi_enum_frameintervals,

	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_expbuf			= vb2_ioctl_expbuf,
	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,

	.vidioc_log_status		= v4l2_ctrl_log_status,
	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
};

static const struct v4l2_file_operations isi_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= video_ioctl2,
	.open		= isi_open,
	.release	= isi_release,
	.poll		= vb2_fop_poll,
	.mmap		= vb2_fop_mmap,
	.read		= vb2_fop_read,
};

static int isi_set_default_fmt(struct atmel_isi *isi)
{
	struct v4l2_format f = {
		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
		.fmt.pix = {
			.width		= VGA_WIDTH,
			.height		= VGA_HEIGHT,
			.field		= V4L2_FIELD_NONE,
			.pixelformat	= isi->user_formats[0]->fourcc,
		},
	};
	int ret;

	ret = isi_try_fmt(isi, &f, NULL);
	if (ret)
		return ret;
	isi->current_fmt = isi->user_formats[0];
	isi->fmt = f;
	return 0;
}

static const struct isi_format isi_formats[] = {
	{
		.fourcc = V4L2_PIX_FMT_YUYV,
		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
	}, {
		.fourcc = V4L2_PIX_FMT_YUYV,
		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
	}, {
		.fourcc = V4L2_PIX_FMT_YUYV,
		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
	}, {
		.fourcc = V4L2_PIX_FMT_YUYV,
		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
	}, {
		.fourcc = V4L2_PIX_FMT_RGB565,
		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
	}, {
		.fourcc = V4L2_PIX_FMT_RGB565,
		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
	}, {
		.fourcc = V4L2_PIX_FMT_RGB565,
		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
	}, {
		.fourcc = V4L2_PIX_FMT_RGB565,
		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
		.bpp = 2,
		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
	}, {
		.fourcc = V4L2_PIX_FMT_GREY,
		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
		.bpp = 1,
		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
	}, {
		.fourcc = V4L2_PIX_FMT_Y16,
		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
		.bpp = 2,
		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
	},
};

static int isi_formats_init(struct atmel_isi *isi)
{
	const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
	unsigned int num_fmts = 0, i, j;
	struct v4l2_subdev *subdev = isi->entity.subdev;
	struct v4l2_subdev_mbus_code_enum mbus_code = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};

	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
				 NULL, &mbus_code)) {
		for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
			if (isi_formats[i].mbus_code != mbus_code.code)
				continue;

			/* Code supported, have we got this fourcc yet? */
			for (j = 0; j < num_fmts; j++)
				if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
					/* Already available */
					break;
			if (j == num_fmts)
				/* new */
				isi_fmts[num_fmts++] = isi_formats + i;
		}
		mbus_code.index++;
	}

	if (!num_fmts)
		return -ENXIO;

	isi->num_user_formats = num_fmts;
	isi->user_formats = devm_kcalloc(isi->dev,
					 num_fmts, sizeof(struct isi_format *),
					 GFP_KERNEL);
	if (!isi->user_formats)
		return -ENOMEM;

	memcpy(isi->user_formats, isi_fmts,
	       num_fmts * sizeof(struct isi_format *));
	isi->current_fmt = isi->user_formats[0];

	return 0;
}

static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
{
	struct atmel_isi *isi = notifier_to_isi(notifier);
	int ret;

	isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
	ret = isi_formats_init(isi);
	if (ret) {
		dev_err(isi->dev, "No supported mediabus format found\n");
		return ret;
	}
	isi_camera_set_bus_param(isi);

	ret = isi_set_default_fmt(isi);
	if (ret) {
		dev_err(isi->dev, "Could not set default format\n");
		return ret;
	}

	ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
	if (ret) {
		dev_err(isi->dev, "Failed to register video device\n");
		return ret;
	}

	dev_dbg(isi->dev, "Device registered as %s\n",
		video_device_node_name(isi->vdev));
	return 0;
}

static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
				     struct v4l2_subdev *sd,
				     struct v4l2_async_subdev *asd)
{
	struct atmel_isi *isi = notifier_to_isi(notifier);

	dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));

	/* Checks internally if vdev have been init or not */
	video_unregister_device(isi->vdev);
}

static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
				   struct v4l2_subdev *subdev,
				   struct v4l2_async_subdev *asd)
{
	struct atmel_isi *isi = notifier_to_isi(notifier);

	dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);

	isi->entity.subdev = subdev;

	return 0;
}

static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
	.bound = isi_graph_notify_bound,
	.unbind = isi_graph_notify_unbind,
	.complete = isi_graph_notify_complete,
};

static int isi_graph_init(struct atmel_isi *isi)
{
	struct v4l2_async_subdev *asd;
	struct device_node *ep;
	int ret;

	ep = of_graph_get_next_endpoint(isi->dev->of_node, NULL);
	if (!ep)
		return -EINVAL;

	v4l2_async_notifier_init(&isi->notifier);

	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
						&isi->notifier,
						of_fwnode_handle(ep),
						struct v4l2_async_subdev);
	of_node_put(ep);

	if (IS_ERR(asd))
		return PTR_ERR(asd);

	isi->notifier.ops = &isi_graph_notify_ops;

	ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
	if (ret < 0) {
		dev_err(isi->dev, "Notifier registration failed\n");
		v4l2_async_notifier_cleanup(&isi->notifier);
		return ret;
	}

	return 0;
}


static int atmel_isi_probe(struct platform_device *pdev)
{
	int irq;
	struct atmel_isi *isi;
	struct vb2_queue *q;
	struct resource *regs;
	int ret, i;

	isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
	if (!isi)
		return -ENOMEM;

	isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
	if (IS_ERR(isi->pclk))
		return PTR_ERR(isi->pclk);

	ret = atmel_isi_parse_dt(isi, pdev);
	if (ret)
		return ret;

	isi->active = NULL;
	isi->dev = &pdev->dev;
	mutex_init(&isi->lock);
	spin_lock_init(&isi->irqlock);
	INIT_LIST_HEAD(&isi->video_buffer_list);
	INIT_LIST_HEAD(&isi->dma_desc_head);

	q = &isi->queue;

	/* Initialize the top-level structure */
	ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
	if (ret)
		return ret;

	isi->vdev = video_device_alloc();
	if (!isi->vdev) {
		ret = -ENOMEM;
		goto err_vdev_alloc;
	}

	/* video node */
	isi->vdev->fops = &isi_fops;
	isi->vdev->v4l2_dev = &isi->v4l2_dev;
	isi->vdev->queue = &isi->queue;
	strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
	isi->vdev->release = video_device_release;
	isi->vdev->ioctl_ops = &isi_ioctl_ops;
	isi->vdev->lock = &isi->lock;
	isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
		V4L2_CAP_READWRITE;
	video_set_drvdata(isi->vdev, isi);

	/* buffer queue */
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
	q->lock = &isi->lock;
	q->drv_priv = isi;
	q->buf_struct_size = sizeof(struct frame_buffer);
	q->ops = &isi_video_qops;
	q->mem_ops = &vb2_dma_contig_memops;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	q->min_buffers_needed = 2;
	q->dev = &pdev->dev;

	ret = vb2_queue_init(q);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
		goto err_vb2_queue;
	}
	isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
				sizeof(struct fbd) * VIDEO_MAX_FRAME,
				&isi->fb_descriptors_phys,
				GFP_KERNEL);
	if (!isi->p_fb_descriptors) {
		dev_err(&pdev->dev, "Can't allocate descriptors!\n");
		ret = -ENOMEM;
		goto err_dma_alloc;
	}

	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
		isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
					i * sizeof(struct fbd);
		list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	isi->regs = devm_ioremap_resource(&pdev->dev, regs);
	if (IS_ERR(isi->regs)) {
		ret = PTR_ERR(isi->regs);
		goto err_ioremap;
	}

	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
		isi->width_flags = 1 << 7;
	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
		isi->width_flags |= 1 << 9;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		ret = irq;
		goto err_req_irq;
	}

	ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
	if (ret) {
		dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
		goto err_req_irq;
	}
	isi->irq = irq;

	ret = isi_graph_init(isi);
	if (ret < 0)
		goto err_req_irq;

	pm_suspend_ignore_children(&pdev->dev, true);
	pm_runtime_enable(&pdev->dev);
	platform_set_drvdata(pdev, isi);
	return 0;

err_req_irq:
err_ioremap:
	dma_free_coherent(&pdev->dev,
			sizeof(struct fbd) * VIDEO_MAX_FRAME,
			isi->p_fb_descriptors,
			isi->fb_descriptors_phys);
err_dma_alloc:
err_vb2_queue:
	video_device_release(isi->vdev);
err_vdev_alloc:
	v4l2_device_unregister(&isi->v4l2_dev);

	return ret;
}

static int atmel_isi_remove(struct platform_device *pdev)
{
	struct atmel_isi *isi = platform_get_drvdata(pdev);

	dma_free_coherent(&pdev->dev,
			sizeof(struct fbd) * VIDEO_MAX_FRAME,
			isi->p_fb_descriptors,
			isi->fb_descriptors_phys);
	pm_runtime_disable(&pdev->dev);
	v4l2_async_notifier_unregister(&isi->notifier);
	v4l2_async_notifier_cleanup(&isi->notifier);
	v4l2_device_unregister(&isi->v4l2_dev);

	return 0;
}

#ifdef CONFIG_PM
static int atmel_isi_runtime_suspend(struct device *dev)
{
	struct atmel_isi *isi = dev_get_drvdata(dev);

	clk_disable_unprepare(isi->pclk);

	return 0;
}
static int atmel_isi_runtime_resume(struct device *dev)
{
	struct atmel_isi *isi = dev_get_drvdata(dev);

	return clk_prepare_enable(isi->pclk);
}
#endif /* CONFIG_PM */

static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
				atmel_isi_runtime_resume, NULL)
};

static const struct of_device_id atmel_isi_of_match[] = {
	{ .compatible = "atmel,at91sam9g45-isi" },
	{ }
};
MODULE_DEVICE_TABLE(of, atmel_isi_of_match);

static struct platform_driver atmel_isi_driver = {
	.driver		= {
		.name = "atmel_isi",
		.of_match_table = of_match_ptr(atmel_isi_of_match),
		.pm	= &atmel_isi_dev_pm_ops,
	},
	.probe		= atmel_isi_probe,
	.remove		= atmel_isi_remove,
};

module_platform_driver(atmel_isi_driver);

MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
MODULE_LICENSE("GPL");