summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/mx2_emmaprp.c
blob: 5f8a6f5b98f91c3af4e1bdbd06654e7b496d8d65 (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
/*
 * Support eMMa-PrP through mem2mem framework.
 *
 * eMMa-PrP is a piece of HW that allows fetching buffers
 * from one memory location and do several operations on
 * them such as scaling or format conversion giving, as a result
 * a new processed buffer in another memory location.
 *
 * Based on mem2mem_testdev.c by Pawel Osciak.
 *
 * Copyright (c) 2011 Vista Silicon S.L.
 * Javier Martin <javier.martin@vista-silicon.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version
 */
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>

#include <linux/platform_device.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-dma-contig.h>
#include <asm/sizes.h>

#define EMMAPRP_MODULE_NAME "mem2mem-emmaprp"

MODULE_DESCRIPTION("Mem-to-mem device which supports eMMa-PrP present in mx2 SoCs");
MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.1");

static bool debug;
module_param(debug, bool, 0644);

#define MIN_W 32
#define MIN_H 32
#define MAX_W 2040
#define MAX_H 2046

#define S_ALIGN		1 /* multiple of 2 */
#define W_ALIGN_YUV420	3 /* multiple of 8 */
#define W_ALIGN_OTHERS	2 /* multiple of 4 */
#define H_ALIGN		1 /* multiple of 2 */

/* Flags that indicate a format can be used for capture/output */
#define MEM2MEM_CAPTURE	(1 << 0)
#define MEM2MEM_OUTPUT	(1 << 1)

#define MEM2MEM_NAME		"m2m-emmaprp"

/* In bytes, per queue */
#define MEM2MEM_VID_MEM_LIMIT	SZ_16M

#define dprintk(dev, fmt, arg...) \
	v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)

/* EMMA PrP */
#define PRP_CNTL                        0x00
#define PRP_INTR_CNTL                   0x04
#define PRP_INTRSTATUS                  0x08
#define PRP_SOURCE_Y_PTR                0x0c
#define PRP_SOURCE_CB_PTR               0x10
#define PRP_SOURCE_CR_PTR               0x14
#define PRP_DEST_RGB1_PTR               0x18
#define PRP_DEST_RGB2_PTR               0x1c
#define PRP_DEST_Y_PTR                  0x20
#define PRP_DEST_CB_PTR                 0x24
#define PRP_DEST_CR_PTR                 0x28
#define PRP_SRC_FRAME_SIZE              0x2c
#define PRP_DEST_CH1_LINE_STRIDE        0x30
#define PRP_SRC_PIXEL_FORMAT_CNTL       0x34
#define PRP_CH1_PIXEL_FORMAT_CNTL       0x38
#define PRP_CH1_OUT_IMAGE_SIZE          0x3c
#define PRP_CH2_OUT_IMAGE_SIZE          0x40
#define PRP_SRC_LINE_STRIDE             0x44
#define PRP_CSC_COEF_012                0x48
#define PRP_CSC_COEF_345                0x4c
#define PRP_CSC_COEF_678                0x50
#define PRP_CH1_RZ_HORI_COEF1           0x54
#define PRP_CH1_RZ_HORI_COEF2           0x58
#define PRP_CH1_RZ_HORI_VALID           0x5c
#define PRP_CH1_RZ_VERT_COEF1           0x60
#define PRP_CH1_RZ_VERT_COEF2           0x64
#define PRP_CH1_RZ_VERT_VALID           0x68
#define PRP_CH2_RZ_HORI_COEF1           0x6c
#define PRP_CH2_RZ_HORI_COEF2           0x70
#define PRP_CH2_RZ_HORI_VALID           0x74
#define PRP_CH2_RZ_VERT_COEF1           0x78
#define PRP_CH2_RZ_VERT_COEF2           0x7c
#define PRP_CH2_RZ_VERT_VALID           0x80

#define PRP_CNTL_CH1EN          (1 << 0)
#define PRP_CNTL_CH2EN          (1 << 1)
#define PRP_CNTL_CSIEN          (1 << 2)
#define PRP_CNTL_DATA_IN_YUV420 (0 << 3)
#define PRP_CNTL_DATA_IN_YUV422 (1 << 3)
#define PRP_CNTL_DATA_IN_RGB16  (2 << 3)
#define PRP_CNTL_DATA_IN_RGB32  (3 << 3)
#define PRP_CNTL_CH1_OUT_RGB8   (0 << 5)
#define PRP_CNTL_CH1_OUT_RGB16  (1 << 5)
#define PRP_CNTL_CH1_OUT_RGB32  (2 << 5)
#define PRP_CNTL_CH1_OUT_YUV422 (3 << 5)
#define PRP_CNTL_CH2_OUT_YUV420 (0 << 7)
#define PRP_CNTL_CH2_OUT_YUV422 (1 << 7)
#define PRP_CNTL_CH2_OUT_YUV444 (2 << 7)
#define PRP_CNTL_CH1_LEN        (1 << 9)
#define PRP_CNTL_CH2_LEN        (1 << 10)
#define PRP_CNTL_SKIP_FRAME     (1 << 11)
#define PRP_CNTL_SWRST          (1 << 12)
#define PRP_CNTL_CLKEN          (1 << 13)
#define PRP_CNTL_WEN            (1 << 14)
#define PRP_CNTL_CH1BYP         (1 << 15)
#define PRP_CNTL_IN_TSKIP(x)    ((x) << 16)
#define PRP_CNTL_CH1_TSKIP(x)   ((x) << 19)
#define PRP_CNTL_CH2_TSKIP(x)   ((x) << 22)
#define PRP_CNTL_INPUT_FIFO_LEVEL(x)    ((x) << 25)
#define PRP_CNTL_RZ_FIFO_LEVEL(x)       ((x) << 27)
#define PRP_CNTL_CH2B1EN        (1 << 29)
#define PRP_CNTL_CH2B2EN        (1 << 30)
#define PRP_CNTL_CH2FEN         (1 << 31)

#define PRP_SIZE_HEIGHT(x)	(x)
#define PRP_SIZE_WIDTH(x)	((x) << 16)

/* IRQ Enable and status register */
#define PRP_INTR_RDERR          (1 << 0)
#define PRP_INTR_CH1WERR        (1 << 1)
#define PRP_INTR_CH2WERR        (1 << 2)
#define PRP_INTR_CH1FC          (1 << 3)
#define PRP_INTR_CH2FC          (1 << 5)
#define PRP_INTR_LBOVF          (1 << 7)
#define PRP_INTR_CH2OVF         (1 << 8)

#define PRP_INTR_ST_RDERR	(1 << 0)
#define PRP_INTR_ST_CH1WERR	(1 << 1)
#define PRP_INTR_ST_CH2WERR	(1 << 2)
#define PRP_INTR_ST_CH2B2CI	(1 << 3)
#define PRP_INTR_ST_CH2B1CI	(1 << 4)
#define PRP_INTR_ST_CH1B2CI	(1 << 5)
#define PRP_INTR_ST_CH1B1CI	(1 << 6)
#define PRP_INTR_ST_LBOVF	(1 << 7)
#define PRP_INTR_ST_CH2OVF	(1 << 8)

struct emmaprp_fmt {
	char	*name;
	u32	fourcc;
	/* Types the format can be used for */
	u32	types;
};

static struct emmaprp_fmt formats[] = {
	{
		.name	= "YUV 4:2:0 Planar",
		.fourcc	= V4L2_PIX_FMT_YUV420,
		.types	= MEM2MEM_CAPTURE,
	},
	{
		.name	= "4:2:2, packed, YUYV",
		.fourcc	= V4L2_PIX_FMT_YUYV,
		.types	= MEM2MEM_OUTPUT,
	},
};

/* Per-queue, driver-specific private data */
struct emmaprp_q_data {
	unsigned int		width;
	unsigned int		height;
	unsigned int		sizeimage;
	struct emmaprp_fmt	*fmt;
};

enum {
	V4L2_M2M_SRC = 0,
	V4L2_M2M_DST = 1,
};

#define NUM_FORMATS ARRAY_SIZE(formats)

static struct emmaprp_fmt *find_format(struct v4l2_format *f)
{
	struct emmaprp_fmt *fmt;
	unsigned int k;

	for (k = 0; k < NUM_FORMATS; k++) {
		fmt = &formats[k];
		if (fmt->fourcc == f->fmt.pix.pixelformat)
			break;
	}

	if (k == NUM_FORMATS)
		return NULL;

	return &formats[k];
}

struct emmaprp_dev {
	struct v4l2_device	v4l2_dev;
	struct video_device	*vfd;

	struct mutex		dev_mutex;
	spinlock_t		irqlock;

	int			irq_emma;
	void __iomem		*base_emma;
	struct clk		*clk_emma;
	struct resource		*res_emma;

	struct v4l2_m2m_dev	*m2m_dev;
	struct vb2_alloc_ctx	*alloc_ctx;
};

struct emmaprp_ctx {
	struct emmaprp_dev	*dev;
	/* Abort requested by m2m */
	int			aborting;
	struct emmaprp_q_data	q_data[2];
	struct v4l2_m2m_ctx	*m2m_ctx;
};

static struct emmaprp_q_data *get_q_data(struct emmaprp_ctx *ctx,
					 enum v4l2_buf_type type)
{
	switch (type) {
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		return &(ctx->q_data[V4L2_M2M_SRC]);
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		return &(ctx->q_data[V4L2_M2M_DST]);
	default:
		BUG();
	}
	return NULL;
}

/*
 * mem2mem callbacks
 */
static void emmaprp_job_abort(void *priv)
{
	struct emmaprp_ctx *ctx = priv;
	struct emmaprp_dev *pcdev = ctx->dev;

	ctx->aborting = 1;

	dprintk(pcdev, "Aborting task\n");

	v4l2_m2m_job_finish(pcdev->m2m_dev, ctx->m2m_ctx);
}

static void emmaprp_lock(void *priv)
{
	struct emmaprp_ctx *ctx = priv;
	struct emmaprp_dev *pcdev = ctx->dev;
	mutex_lock(&pcdev->dev_mutex);
}

static void emmaprp_unlock(void *priv)
{
	struct emmaprp_ctx *ctx = priv;
	struct emmaprp_dev *pcdev = ctx->dev;
	mutex_unlock(&pcdev->dev_mutex);
}

static inline void emmaprp_dump_regs(struct emmaprp_dev *pcdev)
{
	dprintk(pcdev,
		"eMMa-PrP Registers:\n"
		"  SOURCE_Y_PTR = 0x%08X\n"
		"  SRC_FRAME_SIZE = 0x%08X\n"
		"  DEST_Y_PTR = 0x%08X\n"
		"  DEST_CR_PTR = 0x%08X\n"
		"  DEST_CB_PTR = 0x%08X\n"
		"  CH2_OUT_IMAGE_SIZE = 0x%08X\n"
		"  CNTL = 0x%08X\n",
		readl(pcdev->base_emma + PRP_SOURCE_Y_PTR),
		readl(pcdev->base_emma + PRP_SRC_FRAME_SIZE),
		readl(pcdev->base_emma + PRP_DEST_Y_PTR),
		readl(pcdev->base_emma + PRP_DEST_CR_PTR),
		readl(pcdev->base_emma + PRP_DEST_CB_PTR),
		readl(pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE),
		readl(pcdev->base_emma + PRP_CNTL));
}

static void emmaprp_device_run(void *priv)
{
	struct emmaprp_ctx *ctx = priv;
	struct emmaprp_q_data *s_q_data, *d_q_data;
	struct vb2_buffer *src_buf, *dst_buf;
	struct emmaprp_dev *pcdev = ctx->dev;
	unsigned int s_width, s_height;
	unsigned int d_width, d_height;
	unsigned int d_size;
	dma_addr_t p_in, p_out;
	u32 tmp;

	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);

	s_q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
	s_width	= s_q_data->width;
	s_height = s_q_data->height;

	d_q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
	d_width = d_q_data->width;
	d_height = d_q_data->height;
	d_size = d_width * d_height;

	p_in = vb2_dma_contig_plane_dma_addr(src_buf, 0);
	p_out = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
	if (!p_in || !p_out) {
		v4l2_err(&pcdev->v4l2_dev,
			 "Acquiring kernel pointers to buffers failed\n");
		return;
	}

	/* Input frame parameters */
	writel(p_in, pcdev->base_emma + PRP_SOURCE_Y_PTR);
	writel(PRP_SIZE_WIDTH(s_width) | PRP_SIZE_HEIGHT(s_height),
	       pcdev->base_emma + PRP_SRC_FRAME_SIZE);

	/* Output frame parameters */
	writel(p_out, pcdev->base_emma + PRP_DEST_Y_PTR);
	writel(p_out + d_size, pcdev->base_emma + PRP_DEST_CB_PTR);
	writel(p_out + d_size + (d_size >> 2),
	       pcdev->base_emma + PRP_DEST_CR_PTR);
	writel(PRP_SIZE_WIDTH(d_width) | PRP_SIZE_HEIGHT(d_height),
	       pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);

	/* IRQ configuration */
	tmp = readl(pcdev->base_emma + PRP_INTR_CNTL);
	writel(tmp | PRP_INTR_RDERR |
		PRP_INTR_CH2WERR |
		PRP_INTR_CH2FC,
		pcdev->base_emma + PRP_INTR_CNTL);

	emmaprp_dump_regs(pcdev);

	/* Enable transfer */
	tmp = readl(pcdev->base_emma + PRP_CNTL);
	writel(tmp | PRP_CNTL_CH2_OUT_YUV420 |
		PRP_CNTL_DATA_IN_YUV422 |
		PRP_CNTL_CH2EN,
		pcdev->base_emma + PRP_CNTL);
}

static irqreturn_t emmaprp_irq(int irq_emma, void *data)
{
	struct emmaprp_dev *pcdev = data;
	struct emmaprp_ctx *curr_ctx;
	struct vb2_buffer *src_vb, *dst_vb;
	unsigned long flags;
	u32 irqst;

	/* Check irq flags and clear irq */
	irqst = readl(pcdev->base_emma + PRP_INTRSTATUS);
	writel(irqst, pcdev->base_emma + PRP_INTRSTATUS);
	dprintk(pcdev, "irqst = 0x%08x\n", irqst);

	curr_ctx = v4l2_m2m_get_curr_priv(pcdev->m2m_dev);
	if (curr_ctx == NULL) {
		pr_err("Instance released before the end of transaction\n");
		return IRQ_HANDLED;
	}

	if (!curr_ctx->aborting) {
		if ((irqst & PRP_INTR_ST_RDERR) ||
		(irqst & PRP_INTR_ST_CH2WERR)) {
			pr_err("PrP bus error ocurred, this transfer is probably corrupted\n");
			writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
		} else if (irqst & PRP_INTR_ST_CH2B1CI) { /* buffer ready */
			src_vb = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
			dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);

			spin_lock_irqsave(&pcdev->irqlock, flags);
			v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
			v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
			spin_unlock_irqrestore(&pcdev->irqlock, flags);
		}
	}

	v4l2_m2m_job_finish(pcdev->m2m_dev, curr_ctx->m2m_ctx);
	return IRQ_HANDLED;
}

/*
 * video ioctls
 */
static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
	strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
	/*
	 * This is only a mem-to-mem video device. The capture and output
	 * device capability flags are left only for backward compatibility
	 * and are scheduled for removal.
	 */
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
			    V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
	return 0;
}

static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
{
	int i, num;
	struct emmaprp_fmt *fmt;

	num = 0;

	for (i = 0; i < NUM_FORMATS; ++i) {
		if (formats[i].types & type) {
			/* index-th format of type type found ? */
			if (num == f->index)
				break;
			/* Correct type but haven't reached our index yet,
			 * just increment per-type index */
			++num;
		}
	}

	if (i < NUM_FORMATS) {
		/* Format found */
		fmt = &formats[i];
		strlcpy(f->description, fmt->name, sizeof(f->description) - 1);
		f->pixelformat = fmt->fourcc;
		return 0;
	}

	/* Format not found */
	return -EINVAL;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	return enum_fmt(f, MEM2MEM_CAPTURE);
}

static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	return enum_fmt(f, MEM2MEM_OUTPUT);
}

static int vidioc_g_fmt(struct emmaprp_ctx *ctx, struct v4l2_format *f)
{
	struct vb2_queue *vq;
	struct emmaprp_q_data *q_data;

	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
	if (!vq)
		return -EINVAL;

	q_data = get_q_data(ctx, f->type);

	f->fmt.pix.width	= q_data->width;
	f->fmt.pix.height	= q_data->height;
	f->fmt.pix.field	= V4L2_FIELD_NONE;
	f->fmt.pix.pixelformat	= q_data->fmt->fourcc;
	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420)
		f->fmt.pix.bytesperline = q_data->width * 3 / 2;
	else /* YUYV */
		f->fmt.pix.bytesperline = q_data->width * 2;
	f->fmt.pix.sizeimage	= q_data->sizeimage;

	return 0;
}

static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *f)
{
	return vidioc_g_fmt(priv, f);
}

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	return vidioc_g_fmt(priv, f);
}

static int vidioc_try_fmt(struct v4l2_format *f)
{
	enum v4l2_field field;


	if (!find_format(f))
		return -EINVAL;

	field = f->fmt.pix.field;
	if (field == V4L2_FIELD_ANY)
		field = V4L2_FIELD_NONE;
	else if (V4L2_FIELD_NONE != field)
		return -EINVAL;

	/* V4L2 specification suggests the driver corrects the format struct
	 * if any of the dimensions is unsupported */
	f->fmt.pix.field = field;

	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420) {
		v4l_bound_align_image(&f->fmt.pix.width, MIN_W, MAX_W,
				      W_ALIGN_YUV420, &f->fmt.pix.height,
				      MIN_H, MAX_H, H_ALIGN, S_ALIGN);
		f->fmt.pix.bytesperline = f->fmt.pix.width * 3 / 2;
	} else {
		v4l_bound_align_image(&f->fmt.pix.width, MIN_W, MAX_W,
				      W_ALIGN_OTHERS, &f->fmt.pix.height,
				      MIN_H, MAX_H, H_ALIGN, S_ALIGN);
		f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
	}
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;

	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct emmaprp_fmt *fmt;
	struct emmaprp_ctx *ctx = priv;

	fmt = find_format(f);
	if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) {
		v4l2_err(&ctx->dev->v4l2_dev,
			 "Fourcc format (0x%08x) invalid.\n",
			 f->fmt.pix.pixelformat);
		return -EINVAL;
	}

	return vidioc_try_fmt(f);
}

static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct emmaprp_fmt *fmt;
	struct emmaprp_ctx *ctx = priv;

	fmt = find_format(f);
	if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) {
		v4l2_err(&ctx->dev->v4l2_dev,
			 "Fourcc format (0x%08x) invalid.\n",
			 f->fmt.pix.pixelformat);
		return -EINVAL;
	}

	return vidioc_try_fmt(f);
}

static int vidioc_s_fmt(struct emmaprp_ctx *ctx, struct v4l2_format *f)
{
	struct emmaprp_q_data *q_data;
	struct vb2_queue *vq;
	int ret;

	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
	if (!vq)
		return -EINVAL;

	q_data = get_q_data(ctx, f->type);
	if (!q_data)
		return -EINVAL;

	if (vb2_is_busy(vq)) {
		v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
		return -EBUSY;
	}

	ret = vidioc_try_fmt(f);
	if (ret)
		return ret;

	q_data->fmt		= find_format(f);
	q_data->width		= f->fmt.pix.width;
	q_data->height		= f->fmt.pix.height;
	if (q_data->fmt->fourcc == V4L2_PIX_FMT_YUV420)
		q_data->sizeimage = q_data->width * q_data->height * 3 / 2;
	else /* YUYV */
		q_data->sizeimage = q_data->width * q_data->height * 2;

	dprintk(ctx->dev,
		"Setting format for type %d, wxh: %dx%d, fmt: %d\n",
		f->type, q_data->width, q_data->height, q_data->fmt->fourcc);

	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	int ret;

	ret = vidioc_try_fmt_vid_cap(file, priv, f);
	if (ret)
		return ret;

	return vidioc_s_fmt(priv, f);
}

static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *f)
{
	int ret;

	ret = vidioc_try_fmt_vid_out(file, priv, f);
	if (ret)
		return ret;

	return vidioc_s_fmt(priv, f);
}

static int vidioc_reqbufs(struct file *file, void *priv,
			  struct v4l2_requestbuffers *reqbufs)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
}

static int vidioc_querybuf(struct file *file, void *priv,
			   struct v4l2_buffer *buf)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
}

static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
}

static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
}

static int vidioc_streamon(struct file *file, void *priv,
			   enum v4l2_buf_type type)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
}

static int vidioc_streamoff(struct file *file, void *priv,
			    enum v4l2_buf_type type)
{
	struct emmaprp_ctx *ctx = priv;

	return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
}

static const struct v4l2_ioctl_ops emmaprp_ioctl_ops = {
	.vidioc_querycap	= vidioc_querycap,

	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap	= vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap	= vidioc_s_fmt_vid_cap,

	.vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
	.vidioc_g_fmt_vid_out	= vidioc_g_fmt_vid_out,
	.vidioc_try_fmt_vid_out	= vidioc_try_fmt_vid_out,
	.vidioc_s_fmt_vid_out	= vidioc_s_fmt_vid_out,

	.vidioc_reqbufs		= vidioc_reqbufs,
	.vidioc_querybuf	= vidioc_querybuf,

	.vidioc_qbuf		= vidioc_qbuf,
	.vidioc_dqbuf		= vidioc_dqbuf,

	.vidioc_streamon	= vidioc_streamon,
	.vidioc_streamoff	= vidioc_streamoff,
};


/*
 * Queue operations
 */
static int emmaprp_queue_setup(struct vb2_queue *vq,
				const struct v4l2_format *fmt,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], void *alloc_ctxs[])
{
	struct emmaprp_ctx *ctx = vb2_get_drv_priv(vq);
	struct emmaprp_q_data *q_data;
	unsigned int size, count = *nbuffers;

	q_data = get_q_data(ctx, vq->type);

	if (q_data->fmt->fourcc == V4L2_PIX_FMT_YUV420)
		size = q_data->width * q_data->height * 3 / 2;
	else
		size = q_data->width * q_data->height * 2;

	while (size * count > MEM2MEM_VID_MEM_LIMIT)
		(count)--;

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

	alloc_ctxs[0] = ctx->dev->alloc_ctx;

	dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);

	return 0;
}

static int emmaprp_buf_prepare(struct vb2_buffer *vb)
{
	struct emmaprp_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct emmaprp_q_data *q_data;

	dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);

	q_data = get_q_data(ctx, vb->vb2_queue->type);

	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
		dprintk(ctx->dev, "%s data will not fit into plane"
				  "(%lu < %lu)\n", __func__,
				  vb2_plane_size(vb, 0),
				  (long)q_data->sizeimage);
		return -EINVAL;
	}

	vb2_set_plane_payload(vb, 0, q_data->sizeimage);

	return 0;
}

static void emmaprp_buf_queue(struct vb2_buffer *vb)
{
	struct emmaprp_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
}

static struct vb2_ops emmaprp_qops = {
	.queue_setup	 = emmaprp_queue_setup,
	.buf_prepare	 = emmaprp_buf_prepare,
	.buf_queue	 = emmaprp_buf_queue,
};

static int queue_init(void *priv, struct vb2_queue *src_vq,
		      struct vb2_queue *dst_vq)
{
	struct emmaprp_ctx *ctx = priv;
	int ret;

	memset(src_vq, 0, sizeof(*src_vq));
	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	src_vq->io_modes = VB2_MMAP | VB2_USERPTR;
	src_vq->drv_priv = ctx;
	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	src_vq->ops = &emmaprp_qops;
	src_vq->mem_ops = &vb2_dma_contig_memops;

	ret = vb2_queue_init(src_vq);
	if (ret)
		return ret;

	memset(dst_vq, 0, sizeof(*dst_vq));
	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR;
	dst_vq->drv_priv = ctx;
	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	dst_vq->ops = &emmaprp_qops;
	dst_vq->mem_ops = &vb2_dma_contig_memops;

	return vb2_queue_init(dst_vq);
}

/*
 * File operations
 */
static int emmaprp_open(struct file *file)
{
	struct emmaprp_dev *pcdev = video_drvdata(file);
	struct emmaprp_ctx *ctx;

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

	file->private_data = ctx;
	ctx->dev = pcdev;

	ctx->m2m_ctx = v4l2_m2m_ctx_init(pcdev->m2m_dev, ctx, &queue_init);

	if (IS_ERR(ctx->m2m_ctx)) {
		int ret = PTR_ERR(ctx->m2m_ctx);

		kfree(ctx);
		return ret;
	}

	clk_enable(pcdev->clk_emma);
	ctx->q_data[V4L2_M2M_SRC].fmt = &formats[1];
	ctx->q_data[V4L2_M2M_DST].fmt = &formats[0];

	dprintk(pcdev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);

	return 0;
}

static int emmaprp_release(struct file *file)
{
	struct emmaprp_dev *pcdev = video_drvdata(file);
	struct emmaprp_ctx *ctx = file->private_data;

	dprintk(pcdev, "Releasing instance %p\n", ctx);

	clk_disable(pcdev->clk_emma);
	v4l2_m2m_ctx_release(ctx->m2m_ctx);
	kfree(ctx);

	return 0;
}

static unsigned int emmaprp_poll(struct file *file,
				 struct poll_table_struct *wait)
{
	struct emmaprp_ctx *ctx = file->private_data;

	return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
}

static int emmaprp_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct emmaprp_ctx *ctx = file->private_data;

	return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
}

static const struct v4l2_file_operations emmaprp_fops = {
	.owner		= THIS_MODULE,
	.open		= emmaprp_open,
	.release	= emmaprp_release,
	.poll		= emmaprp_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= emmaprp_mmap,
};

static struct video_device emmaprp_videodev = {
	.name		= MEM2MEM_NAME,
	.fops		= &emmaprp_fops,
	.ioctl_ops	= &emmaprp_ioctl_ops,
	.minor		= -1,
	.release	= video_device_release,
};

static struct v4l2_m2m_ops m2m_ops = {
	.device_run	= emmaprp_device_run,
	.job_abort	= emmaprp_job_abort,
	.lock		= emmaprp_lock,
	.unlock		= emmaprp_unlock,
};

static int emmaprp_probe(struct platform_device *pdev)
{
	struct emmaprp_dev *pcdev;
	struct video_device *vfd;
	struct resource *res_emma;
	int irq_emma;
	int ret;

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

	spin_lock_init(&pcdev->irqlock);

	pcdev->clk_emma = clk_get(&pdev->dev, NULL);
	if (IS_ERR(pcdev->clk_emma)) {
		ret = PTR_ERR(pcdev->clk_emma);
		goto free_dev;
	}

	irq_emma = platform_get_irq(pdev, 0);
	res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (irq_emma < 0 || res_emma == NULL) {
		dev_err(&pdev->dev, "Missing platform resources data\n");
		ret = -ENODEV;
		goto free_clk;
	}

	ret = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
	if (ret)
		goto free_clk;

	mutex_init(&pcdev->dev_mutex);

	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(&pcdev->v4l2_dev, "Failed to allocate video device\n");
		ret = -ENOMEM;
		goto unreg_dev;
	}

	*vfd = emmaprp_videodev;
	/* Locking in file operations other than ioctl should be done
	   by the driver, not the V4L2 core.
	   This driver needs auditing so that this flag can be removed. */
	set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
	vfd->lock = &pcdev->dev_mutex;

	video_set_drvdata(vfd, pcdev);
	snprintf(vfd->name, sizeof(vfd->name), "%s", emmaprp_videodev.name);
	pcdev->vfd = vfd;
	v4l2_info(&pcdev->v4l2_dev, EMMAPRP_MODULE_NAME
			" Device registered as /dev/video%d\n", vfd->num);

	platform_set_drvdata(pdev, pcdev);

	if (devm_request_mem_region(&pdev->dev, res_emma->start,
	    resource_size(res_emma), MEM2MEM_NAME) == NULL)
		goto rel_vdev;

	pcdev->base_emma = devm_ioremap(&pdev->dev, res_emma->start,
					resource_size(res_emma));
	if (!pcdev->base_emma)
		goto rel_vdev;

	pcdev->irq_emma = irq_emma;
	pcdev->res_emma = res_emma;

	if (devm_request_irq(&pdev->dev, pcdev->irq_emma, emmaprp_irq,
			     0, MEM2MEM_NAME, pcdev) < 0)
		goto rel_vdev;

	pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
	if (IS_ERR(pcdev->alloc_ctx)) {
		v4l2_err(&pcdev->v4l2_dev, "Failed to alloc vb2 context\n");
		ret = PTR_ERR(pcdev->alloc_ctx);
		goto rel_vdev;
	}

	pcdev->m2m_dev = v4l2_m2m_init(&m2m_ops);
	if (IS_ERR(pcdev->m2m_dev)) {
		v4l2_err(&pcdev->v4l2_dev, "Failed to init mem2mem device\n");
		ret = PTR_ERR(pcdev->m2m_dev);
		goto rel_ctx;
	}

	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
	if (ret) {
		v4l2_err(&pcdev->v4l2_dev, "Failed to register video device\n");
		goto rel_m2m;
	}

	return 0;


rel_m2m:
	v4l2_m2m_release(pcdev->m2m_dev);
rel_ctx:
	vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
rel_vdev:
	video_device_release(vfd);
unreg_dev:
	v4l2_device_unregister(&pcdev->v4l2_dev);
free_clk:
	clk_put(pcdev->clk_emma);
free_dev:
	kfree(pcdev);

	return ret;
}

static int emmaprp_remove(struct platform_device *pdev)
{
	struct emmaprp_dev *pcdev = platform_get_drvdata(pdev);

	v4l2_info(&pcdev->v4l2_dev, "Removing " EMMAPRP_MODULE_NAME);

	video_unregister_device(pcdev->vfd);
	v4l2_m2m_release(pcdev->m2m_dev);
	vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
	v4l2_device_unregister(&pcdev->v4l2_dev);
	clk_put(pcdev->clk_emma);
	kfree(pcdev);

	return 0;
}

static struct platform_driver emmaprp_pdrv = {
	.probe		= emmaprp_probe,
	.remove		= emmaprp_remove,
	.driver		= {
		.name	= MEM2MEM_NAME,
		.owner	= THIS_MODULE,
	},
};

static void __exit emmaprp_exit(void)
{
	platform_driver_unregister(&emmaprp_pdrv);
}

static int __init emmaprp_init(void)
{
	return platform_driver_register(&emmaprp_pdrv);
}

module_init(emmaprp_init);
module_exit(emmaprp_exit);