coda.c

/*
 * Coda multi-standard codec IP
 *
 * Copyright (C) 2012 Vista Silicon S.L.
 *    Javier Martin, <javier.martin@vista-silicon.com>
 *    Xavier Duret
 *
 * 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/clk.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/genalloc.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kfifo.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/of.h>
#include <linux/platform_data/coda.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>

#include "coda.h"

#define CODA_NAME		"coda"

#define CODA_MAX_INSTANCES	4

#define CODA_FMO_BUF_SIZE	32
#define CODADX6_WORK_BUF_SIZE	(288 * 1024 + CODA_FMO_BUF_SIZE * 8 * 1024)
#define CODA7_WORK_BUF_SIZE	(128 * 1024)
#define CODA7_TEMP_BUF_SIZE	(304 * 1024)
#define CODA_PARA_BUF_SIZE	(10 * 1024)
#define CODA_ISRAM_SIZE	(2048 * 2)
#define CODADX6_IRAM_SIZE	0xb000
#define CODA7_IRAM_SIZE		0x14000 /* 81920 bytes */

#define CODA_MAX_FRAMEBUFFERS	2

#define MAX_W		8192
#define MAX_H		8192
#define CODA_MAX_FRAME_SIZE	0x100000
#define FMO_SLICE_SAVE_BUF_SIZE         (32)
#define CODA_DEFAULT_GAMMA		4096

#define MIN_W 176
#define MIN_H 144

#define S_ALIGN		1 /* multiple of 2 */
#define W_ALIGN		1 /* multiple of 2 */
#define H_ALIGN		1 /* multiple of 2 */

#define fh_to_ctx(__fh)	container_of(__fh, struct coda_ctx, fh)

static int coda_debug;
module_param(coda_debug, int, 0644);
MODULE_PARM_DESC(coda_debug, "Debug level (0-1)");

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

enum coda_inst_type {
	CODA_INST_ENCODER,
	CODA_INST_DECODER,
};

enum coda_product {
	CODA_DX6 = 0xf001,
	CODA_7541 = 0xf012,
};

struct coda_fmt {
	char *name;
	u32 fourcc;
};

struct coda_codec {
	u32 mode;
	u32 src_fourcc;
	u32 dst_fourcc;
	u32 max_w;
	u32 max_h;
};

struct coda_devtype {
	char			*firmware;
	enum coda_product	product;
	struct coda_codec	*codecs;
	unsigned int		num_codecs;
	size_t			workbuf_size;
};

/* Per-queue, driver-specific private data */
struct coda_q_data {
	unsigned int		width;
	unsigned int		height;
	unsigned int		sizeimage;
	unsigned int		fourcc;
};

struct coda_aux_buf {
	void			*vaddr;
	dma_addr_t		paddr;
	u32			size;
};

struct coda_dev {
	struct v4l2_device	v4l2_dev;
	struct video_device	vfd;
	struct platform_device	*plat_dev;
	const struct coda_devtype *devtype;

	void __iomem		*regs_base;
	struct clk		*clk_per;
	struct clk		*clk_ahb;

	struct coda_aux_buf	codebuf;
	struct coda_aux_buf	tempbuf;
	struct coda_aux_buf	workbuf;
	struct gen_pool		*iram_pool;
	long unsigned int	iram_vaddr;
	long unsigned int	iram_paddr;
	unsigned long		iram_size;

	spinlock_t		irqlock;
	struct mutex		dev_mutex;
	struct mutex		coda_mutex;
	struct v4l2_m2m_dev	*m2m_dev;
	struct vb2_alloc_ctx	*alloc_ctx;
	struct list_head	instances;
	unsigned long		instance_mask;
	struct delayed_work	timeout;
};

struct coda_params {
	u8			rot_mode;
	u8			h264_intra_qp;
	u8			h264_inter_qp;
	u8			mpeg4_intra_qp;
	u8			mpeg4_inter_qp;
	u8			gop_size;
	int			codec_mode;
	int			codec_mode_aux;
	enum v4l2_mpeg_video_multi_slice_mode slice_mode;
	u32			framerate;
	u16			bitrate;
	u32			slice_max_bits;
	u32			slice_max_mb;
};

struct coda_iram_info {
	u32		axi_sram_use;
	phys_addr_t	buf_bit_use;
	phys_addr_t	buf_ip_ac_dc_use;
	phys_addr_t	buf_dbk_y_use;
	phys_addr_t	buf_dbk_c_use;
	phys_addr_t	buf_ovl_use;
	phys_addr_t	buf_btp_use;
	phys_addr_t	search_ram_paddr;
	int		search_ram_size;
};

struct coda_ctx {
	struct coda_dev			*dev;
	struct list_head		list;
	int				aborting;
	int				streamon_out;
	int				streamon_cap;
	u32				isequence;
	u32				qsequence;
	struct coda_q_data		q_data[2];
	enum coda_inst_type		inst_type;
	struct coda_codec		*codec;
	enum v4l2_colorspace		colorspace;
	struct coda_params		params;
	struct v4l2_m2m_ctx		*m2m_ctx;
	struct v4l2_ctrl_handler	ctrls;
	struct v4l2_fh			fh;
	int				gopcounter;
	char				vpu_header[3][64];
	int				vpu_header_size[3];
	struct kfifo			bitstream_fifo;
	struct mutex			bitstream_mutex;
	struct coda_aux_buf		bitstream;
	struct coda_aux_buf		parabuf;
	struct coda_aux_buf		internal_frames[CODA_MAX_FRAMEBUFFERS];
	struct coda_aux_buf		workbuf;
	int				num_internal_frames;
	int				idx;
	int				reg_idx;
	struct coda_iram_info		iram_info;
	u32				bit_stream_param;
};

static const u8 coda_filler_nal[14] = { 0x00, 0x00, 0x00, 0x01, 0x0c, 0xff,
			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 };
static const u8 coda_filler_size[8] = { 0, 7, 14, 13, 12, 11, 10, 9 };

static inline void coda_write(struct coda_dev *dev, u32 data, u32 reg)
{
	v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
		 "%s: data=0x%x, reg=0x%x\n", __func__, data, reg);
	writel(data, dev->regs_base + reg);
}

static inline unsigned int coda_read(struct coda_dev *dev, u32 reg)
{
	u32 data;
	data = readl(dev->regs_base + reg);
	v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
		 "%s: data=0x%x, reg=0x%x\n", __func__, data, reg);
	return data;
}

static inline unsigned long coda_isbusy(struct coda_dev *dev)
{
	return coda_read(dev, CODA_REG_BIT_BUSY);
}

static inline int coda_is_initialized(struct coda_dev *dev)
{
	return (coda_read(dev, CODA_REG_BIT_CUR_PC) != 0);
}

static int coda_wait_timeout(struct coda_dev *dev)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);

	while (coda_isbusy(dev)) {
		if (time_after(jiffies, timeout))
			return -ETIMEDOUT;
	}
	return 0;
}

static void coda_command_async(struct coda_ctx *ctx, int cmd)
{
	struct coda_dev *dev = ctx->dev;

	if (dev->devtype->product == CODA_7541) {
		/* Restore context related registers to CODA */
		coda_write(dev, ctx->bit_stream_param,
				CODA_REG_BIT_BIT_STREAM_PARAM);
		coda_write(dev, ctx->workbuf.paddr, CODA_REG_BIT_WORK_BUF_ADDR);
	}

	coda_write(dev, CODA_REG_BIT_BUSY_FLAG, CODA_REG_BIT_BUSY);

	coda_write(dev, ctx->idx, CODA_REG_BIT_RUN_INDEX);
	coda_write(dev, ctx->params.codec_mode, CODA_REG_BIT_RUN_COD_STD);
	coda_write(dev, ctx->params.codec_mode_aux, CODA7_REG_BIT_RUN_AUX_STD);

	coda_write(dev, cmd, CODA_REG_BIT_RUN_COMMAND);
}

static int coda_command_sync(struct coda_ctx *ctx, int cmd)
{
	struct coda_dev *dev = ctx->dev;

	coda_command_async(ctx, cmd);
	return coda_wait_timeout(dev);
}

static struct coda_q_data *get_q_data(struct coda_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;
}

/*
 * Array of all formats supported by any version of Coda:
 */
static struct coda_fmt coda_formats[] = {
	{
		.name = "YUV 4:2:0 Planar, YCbCr",
		.fourcc = V4L2_PIX_FMT_YUV420,
	},
	{
		.name = "YUV 4:2:0 Planar, YCrCb",
		.fourcc = V4L2_PIX_FMT_YVU420,
	},
	{
		.name = "H264 Encoded Stream",
		.fourcc = V4L2_PIX_FMT_H264,
	},
	{
		.name = "MPEG4 Encoded Stream",
		.fourcc = V4L2_PIX_FMT_MPEG4,
	},
};

#define CODA_CODEC(mode, src_fourcc, dst_fourcc, max_w, max_h) \
	{ mode, src_fourcc, dst_fourcc, max_w, max_h }

/*
 * Arrays of codecs supported by each given version of Coda:
 *  i.MX27 -> codadx6
 *  i.MX5x -> coda7
 *  i.MX6  -> coda960
 * Use V4L2_PIX_FMT_YUV420 as placeholder for all supported YUV 4:2:0 variants
 */
static struct coda_codec codadx6_codecs[] = {
	CODA_CODEC(CODADX6_MODE_ENCODE_H264, V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_H264,  720, 576),
	CODA_CODEC(CODADX6_MODE_ENCODE_MP4,  V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_MPEG4, 720, 576),
};

static struct coda_codec coda7_codecs[] = {
	CODA_CODEC(CODA7_MODE_ENCODE_H264, V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_H264,   1280, 720),
	CODA_CODEC(CODA7_MODE_ENCODE_MP4,  V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_MPEG4,  1280, 720),
};

static bool coda_format_is_yuv(u32 fourcc)
{
	switch (fourcc) {
	case V4L2_PIX_FMT_YUV420:
	case V4L2_PIX_FMT_YVU420:
		return true;
	default:
		return false;
	}
}

/*
 * Normalize all supported YUV 4:2:0 formats to the value used in the codec
 * tables.
 */
static u32 coda_format_normalize_yuv(u32 fourcc)
{
	return coda_format_is_yuv(fourcc) ? V4L2_PIX_FMT_YUV420 : fourcc;
}

static struct coda_codec *coda_find_codec(struct coda_dev *dev, int src_fourcc,
					  int dst_fourcc)
{
	struct coda_codec *codecs = dev->devtype->codecs;
	int num_codecs = dev->devtype->num_codecs;
	int k;

	src_fourcc = coda_format_normalize_yuv(src_fourcc);
	dst_fourcc = coda_format_normalize_yuv(dst_fourcc);
	if (src_fourcc == dst_fourcc)
		return NULL;

	for (k = 0; k < num_codecs; k++) {
		if (codecs[k].src_fourcc == src_fourcc &&
		    codecs[k].dst_fourcc == dst_fourcc)
			break;
	}

	if (k == num_codecs)
		return NULL;

	return &codecs[k];
}

/*
 * V4L2 ioctl() operations.
 */
static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	strlcpy(cap->driver, CODA_NAME, sizeof(cap->driver));
	strlcpy(cap->card, CODA_NAME, sizeof(cap->card));
	strlcpy(cap->bus_info, "platform:" CODA_NAME, sizeof(cap->bus_info));
	/*
	 * 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->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
			   V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

	return 0;
}

static int enum_fmt(void *priv, struct v4l2_fmtdesc *f,
			enum v4l2_buf_type type)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);
	struct coda_codec *codecs = ctx->dev->devtype->codecs;
	struct coda_fmt *formats = coda_formats;
	struct coda_fmt *fmt;
	int num_codecs = ctx->dev->devtype->num_codecs;
	int num_formats = ARRAY_SIZE(coda_formats);
	int i, k, num = 0;

	for (i = 0; i < num_formats; i++) {
		/* Both uncompressed formats are always supported */
		if (coda_format_is_yuv(formats[i].fourcc)) {
			if (num == f->index)
				break;
			++num;
			continue;
		}
		/* Compressed formats may be supported, check the codec list */
		for (k = 0; k < num_codecs; k++) {
			if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
			    formats[i].fourcc == codecs[k].dst_fourcc)
				break;
			if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
			    formats[i].fourcc == codecs[k].src_fourcc)
				break;
		}
		if (k < num_codecs) {
			if (num == f->index)
				break;
			++num;
		}
	}

	if (i < num_formats) {
		fmt = &formats[i];
		strlcpy(f->description, fmt->name, sizeof(f->description));
		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(priv, f, V4L2_BUF_TYPE_VIDEO_CAPTURE);
}

static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	return enum_fmt(priv, f, V4L2_BUF_TYPE_VIDEO_OUTPUT);
}

static int vidioc_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
	struct vb2_queue *vq;
	struct coda_q_data *q_data;
	struct coda_ctx *ctx = fh_to_ctx(priv);

	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.field	= V4L2_FIELD_NONE;
	f->fmt.pix.pixelformat	= q_data->fourcc;
	f->fmt.pix.width	= q_data->width;
	f->fmt.pix.height	= q_data->height;
	if (coda_format_is_yuv(f->fmt.pix.pixelformat))
		f->fmt.pix.bytesperline = round_up(f->fmt.pix.width, 2);
	else /* encoded formats h.264/mpeg4 */
		f->fmt.pix.bytesperline = 0;

	f->fmt.pix.sizeimage	= q_data->sizeimage;
	f->fmt.pix.colorspace	= ctx->colorspace;

	return 0;
}

static int vidioc_try_fmt(struct coda_codec *codec, struct v4l2_format *f)
{
	unsigned int max_w, max_h;
	enum v4l2_field field;

	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 (codec) {
		max_w = codec->max_w;
		max_h = codec->max_h;
	} else {
		max_w = MAX_W;
		max_h = MAX_H;
	}
	v4l_bound_align_image(&f->fmt.pix.width, MIN_W, max_w,
			      W_ALIGN, &f->fmt.pix.height,
			      MIN_H, max_h, H_ALIGN, S_ALIGN);

	if (coda_format_is_yuv(f->fmt.pix.pixelformat)) {
		/* Frame stride must be multiple of 8 */
		f->fmt.pix.bytesperline = round_up(f->fmt.pix.width, 8);
		f->fmt.pix.sizeimage = f->fmt.pix.bytesperline *
					f->fmt.pix.height * 3 / 2;
	} else { /*encoded formats h.264/mpeg4 */
		f->fmt.pix.bytesperline = 0;
		f->fmt.pix.sizeimage = CODA_MAX_FRAME_SIZE;
	}

	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);
	struct coda_codec *codec = NULL;

	/* Determine codec by the encoded format */
	codec = coda_find_codec(ctx->dev, V4L2_PIX_FMT_YUV420,
				f->fmt.pix.pixelformat);

	f->fmt.pix.colorspace = ctx->colorspace;

	return vidioc_try_fmt(codec, f);
}

static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);
	struct coda_codec *codec;

	/* Determine codec by encoded format, returns NULL if raw or invalid */
	codec = coda_find_codec(ctx->dev, f->fmt.pix.pixelformat,
				V4L2_PIX_FMT_YUV420);

	if (!f->fmt.pix.colorspace)
		f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;

	return vidioc_try_fmt(codec, f);
}

static int vidioc_s_fmt(struct coda_ctx *ctx, struct v4l2_format *f)
{
	struct coda_q_data *q_data;
	struct vb2_queue *vq;

	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;
	}

	q_data->fourcc = f->fmt.pix.pixelformat;
	q_data->width = f->fmt.pix.width;
	q_data->height = f->fmt.pix.height;
	q_data->sizeimage = f->fmt.pix.sizeimage;

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
		"Setting format for type %d, wxh: %dx%d, fmt: %d\n",
		f->type, q_data->width, q_data->height, q_data->fourcc);

	return 0;
}

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

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

	return vidioc_s_fmt(ctx, f);
}

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

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

	ret = vidioc_s_fmt(ctx, f);
	if (ret)
		ctx->colorspace = f->fmt.pix.colorspace;

	return ret;
}

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

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

static int vidioc_expbuf(struct file *file, void *priv,
			 struct v4l2_exportbuffer *eb)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);

	return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb);
}

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

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

static int vidioc_create_bufs(struct file *file, void *priv,
			      struct v4l2_create_buffers *create)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);

	return v4l2_m2m_create_bufs(file, ctx->m2m_ctx, create);
}

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

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

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

	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt,
	.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,
	.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_expbuf		= vidioc_expbuf,
	.vidioc_dqbuf		= vidioc_dqbuf,
	.vidioc_create_bufs	= vidioc_create_bufs,

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

static inline int coda_get_bitstream_payload(struct coda_ctx *ctx)
{
	return kfifo_len(&ctx->bitstream_fifo);
}

static void coda_kfifo_sync_from_device(struct coda_ctx *ctx)
{
	struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
	struct coda_dev *dev = ctx->dev;
	u32 rd_ptr;

	rd_ptr = coda_read(dev, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
	kfifo->out = (kfifo->in & ~kfifo->mask) |
		      (rd_ptr - ctx->bitstream.paddr);
	if (kfifo->out > kfifo->in)
		kfifo->out -= kfifo->mask + 1;
}

static void coda_kfifo_sync_to_device_full(struct coda_ctx *ctx)
{
	struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
	struct coda_dev *dev = ctx->dev;
	u32 rd_ptr, wr_ptr;

	rd_ptr = ctx->bitstream.paddr + (kfifo->out & kfifo->mask);
	coda_write(dev, rd_ptr, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
	wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
	coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
}

static void coda_kfifo_sync_to_device_write(struct coda_ctx *ctx)
{
	struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
	struct coda_dev *dev = ctx->dev;
	u32 wr_ptr;

	wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
	coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
}

static int coda_bitstream_queue(struct coda_ctx *ctx, struct vb2_buffer *src_buf)
{
	u32 src_size = vb2_get_plane_payload(src_buf, 0);
	u32 n;

	n = kfifo_in(&ctx->bitstream_fifo, vb2_plane_vaddr(src_buf, 0), src_size);
	if (n < src_size)
		return -ENOSPC;

	dma_sync_single_for_device(&ctx->dev->plat_dev->dev, ctx->bitstream.paddr,
				   ctx->bitstream.size, DMA_TO_DEVICE);

	ctx->qsequence++;

	return 0;
}

static bool coda_bitstream_try_queue(struct coda_ctx *ctx,
				     struct vb2_buffer *src_buf)
{
	int ret;

	if (coda_get_bitstream_payload(ctx) +
	    vb2_get_plane_payload(src_buf, 0) + 512 >= ctx->bitstream.size)
		return false;

	if (vb2_plane_vaddr(src_buf, 0) == NULL) {
		v4l2_err(&ctx->dev->v4l2_dev, "trying to queue empty buffer\n");
		return true;
	}

	ret = coda_bitstream_queue(ctx, src_buf);
	if (ret < 0) {
		v4l2_err(&ctx->dev->v4l2_dev, "bitstream buffer overflow\n");
		return false;
	}
	/* Sync read pointer to device */
	if (ctx == v4l2_m2m_get_curr_priv(ctx->dev->m2m_dev))
		coda_kfifo_sync_to_device_write(ctx);

	return true;
}

static void coda_fill_bitstream(struct coda_ctx *ctx)
{
	struct vb2_buffer *src_buf;

	while (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) > 0) {
		src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);

		if (coda_bitstream_try_queue(ctx, src_buf)) {
			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
			v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
		} else {
			break;
		}
	}
}

/*
 * Mem-to-mem operations.
 */
static void coda_device_run(void *m2m_priv)
{
	struct coda_ctx *ctx = m2m_priv;
	struct coda_q_data *q_data_src, *q_data_dst;
	struct vb2_buffer *src_buf, *dst_buf;
	struct coda_dev *dev = ctx->dev;
	int force_ipicture;
	int quant_param = 0;
	u32 picture_y, picture_cb, picture_cr;
	u32 pic_stream_buffer_addr, pic_stream_buffer_size;
	u32 dst_fourcc;

	mutex_lock(&dev->coda_mutex);

	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
	q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
	q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
	dst_fourcc = q_data_dst->fourcc;

	src_buf->v4l2_buf.sequence = ctx->isequence;
	dst_buf->v4l2_buf.sequence = ctx->isequence;
	ctx->isequence++;

	/*
	 * Workaround coda firmware BUG that only marks the first
	 * frame as IDR. This is a problem for some decoders that can't
	 * recover when a frame is lost.
	 */
	if (src_buf->v4l2_buf.sequence % ctx->params.gop_size) {
		src_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_PFRAME;
		src_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_KEYFRAME;
	} else {
		src_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_KEYFRAME;
		src_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_PFRAME;
	}

	/*
	 * Copy headers at the beginning of the first frame for H.264 only.
	 * In MPEG4 they are already copied by the coda.
	 */
	if (src_buf->v4l2_buf.sequence == 0) {
		pic_stream_buffer_addr =
			vb2_dma_contig_plane_dma_addr(dst_buf, 0) +
			ctx->vpu_header_size[0] +
			ctx->vpu_header_size[1] +
			ctx->vpu_header_size[2];
		pic_stream_buffer_size = CODA_MAX_FRAME_SIZE -
			ctx->vpu_header_size[0] -
			ctx->vpu_header_size[1] -
			ctx->vpu_header_size[2];
		memcpy(vb2_plane_vaddr(dst_buf, 0),
		       &ctx->vpu_header[0][0], ctx->vpu_header_size[0]);
		memcpy(vb2_plane_vaddr(dst_buf, 0) + ctx->vpu_header_size[0],
		       &ctx->vpu_header[1][0], ctx->vpu_header_size[1]);
		memcpy(vb2_plane_vaddr(dst_buf, 0) + ctx->vpu_header_size[0] +
			ctx->vpu_header_size[1], &ctx->vpu_header[2][0],
			ctx->vpu_header_size[2]);
	} else {
		pic_stream_buffer_addr =
			vb2_dma_contig_plane_dma_addr(dst_buf, 0);
		pic_stream_buffer_size = CODA_MAX_FRAME_SIZE;
	}

	if (src_buf->v4l2_buf.flags & V4L2_BUF_FLAG_KEYFRAME) {
		force_ipicture = 1;
		switch (dst_fourcc) {
		case V4L2_PIX_FMT_H264:
			quant_param = ctx->params.h264_intra_qp;
			break;
		case V4L2_PIX_FMT_MPEG4:
			quant_param = ctx->params.mpeg4_intra_qp;
			break;
		default:
			v4l2_warn(&ctx->dev->v4l2_dev,
				"cannot set intra qp, fmt not supported\n");
			break;
		}
	} else {
		force_ipicture = 0;
		switch (dst_fourcc) {
		case V4L2_PIX_FMT_H264:
			quant_param = ctx->params.h264_inter_qp;
			break;
		case V4L2_PIX_FMT_MPEG4:
			quant_param = ctx->params.mpeg4_inter_qp;
			break;
		default:
			v4l2_warn(&ctx->dev->v4l2_dev,
				"cannot set inter qp, fmt not supported\n");
			break;
		}
	}

	/* submit */
	coda_write(dev, CODA_ROT_MIR_ENABLE | ctx->params.rot_mode, CODA_CMD_ENC_PIC_ROT_MODE);
	coda_write(dev, quant_param, CODA_CMD_ENC_PIC_QS);


	picture_y = vb2_dma_contig_plane_dma_addr(src_buf, 0);
	switch (q_data_src->fourcc) {
	case V4L2_PIX_FMT_YVU420:
		/* Switch Cb and Cr for YVU420 format */
		picture_cr = picture_y + q_data_src->width * q_data_src->height;
		picture_cb = picture_cr + q_data_src->width / 2 *
				q_data_src->height / 2;
		break;
	case V4L2_PIX_FMT_YUV420:
	default:
		picture_cb = picture_y + q_data_src->width * q_data_src->height;
		picture_cr = picture_cb + q_data_src->width / 2 *
				q_data_src->height / 2;
		break;
	}

	coda_write(dev, picture_y, CODA_CMD_ENC_PIC_SRC_ADDR_Y);
	coda_write(dev, picture_cb, CODA_CMD_ENC_PIC_SRC_ADDR_CB);
	coda_write(dev, picture_cr, CODA_CMD_ENC_PIC_SRC_ADDR_CR);
	coda_write(dev, force_ipicture << 1 & 0x2,
		   CODA_CMD_ENC_PIC_OPTION);

	coda_write(dev, pic_stream_buffer_addr, CODA_CMD_ENC_PIC_BB_START);
	coda_write(dev, pic_stream_buffer_size / 1024,
		   CODA_CMD_ENC_PIC_BB_SIZE);

	if (dev->devtype->product == CODA_7541) {
		coda_write(dev, CODA7_USE_BIT_ENABLE | CODA7_USE_HOST_BIT_ENABLE |
				CODA7_USE_ME_ENABLE | CODA7_USE_HOST_ME_ENABLE,
				CODA7_REG_BIT_AXI_SRAM_USE);
	}

	if (dev->devtype->product != CODA_DX6)
		coda_write(dev, ctx->iram_info.axi_sram_use,
				CODA7_REG_BIT_AXI_SRAM_USE);

	/* 1 second timeout in case CODA locks up */
	schedule_delayed_work(&dev->timeout, HZ);

	coda_command_async(ctx, CODA_COMMAND_PIC_RUN);
}

static int coda_job_ready(void *m2m_priv)
{
	struct coda_ctx *ctx = m2m_priv;

	/*
	 * For both 'P' and 'key' frame cases 1 picture
	 * and 1 frame are needed. In the decoder case,
	 * the compressed frame can be in the bitstream.
	 */
	if (!v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) &&
	    ctx->inst_type != CODA_INST_DECODER) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: not enough video buffers.\n");
		return 0;
	}

	if (!v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx)) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: not enough video capture buffers.\n");
		return 0;
	}

	if (ctx->aborting) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: aborting\n");
		return 0;
	}

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			"job ready\n");
	return 1;
}

static void coda_job_abort(void *priv)
{
	struct coda_ctx *ctx = priv;

	ctx->aborting = 1;

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
		 "Aborting task\n");
}

static void coda_lock(void *m2m_priv)
{
	struct coda_ctx *ctx = m2m_priv;
	struct coda_dev *pcdev = ctx->dev;
	mutex_lock(&pcdev->dev_mutex);
}

static void coda_unlock(void *m2m_priv)
{
	struct coda_ctx *ctx = m2m_priv;
	struct coda_dev *pcdev = ctx->dev;
	mutex_unlock(&pcdev->dev_mutex);
}

static struct v4l2_m2m_ops coda_m2m_ops = {
	.device_run	= coda_device_run,
	.job_ready	= coda_job_ready,
	.job_abort	= coda_job_abort,
	.lock		= coda_lock,
	.unlock		= coda_unlock,
};

static void set_default_params(struct coda_ctx *ctx)
{
	int max_w;
	int max_h;

	ctx->codec = &ctx->dev->devtype->codecs[0];
	max_w = ctx->codec->max_w;
	max_h = ctx->codec->max_h;

	ctx->params.codec_mode = CODA_MODE_INVALID;
	ctx->colorspace = V4L2_COLORSPACE_REC709;
	ctx->params.framerate = 30;
	ctx->aborting = 0;

	/* Default formats for output and input queues */
	ctx->q_data[V4L2_M2M_SRC].fourcc = ctx->codec->src_fourcc;
	ctx->q_data[V4L2_M2M_DST].fourcc = ctx->codec->dst_fourcc;
	ctx->q_data[V4L2_M2M_SRC].width = max_w;
	ctx->q_data[V4L2_M2M_SRC].height = max_h;
	ctx->q_data[V4L2_M2M_SRC].sizeimage = (max_w * max_h * 3) / 2;
	ctx->q_data[V4L2_M2M_DST].width = max_w;
	ctx->q_data[V4L2_M2M_DST].height = max_h;
	ctx->q_data[V4L2_M2M_DST].sizeimage = CODA_MAX_FRAME_SIZE;
}

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

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

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

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

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
		 "get %d buffer(s) of size %d each.\n", *nbuffers, size);

	return 0;
}

static int coda_buf_prepare(struct vb2_buffer *vb)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct coda_q_data *q_data;

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

	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
		v4l2_warn(&ctx->dev->v4l2_dev,
			  "%s data will not fit into plane (%lu < %lu)\n",
			  __func__, vb2_plane_size(vb, 0),
			  (long)q_data->sizeimage);
		return -EINVAL;
	}

	return 0;
}

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

static void coda_wait_prepare(struct vb2_queue *q)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(q);
	coda_unlock(ctx);
}

static void coda_wait_finish(struct vb2_queue *q)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(q);
	coda_lock(ctx);
}

static void coda_parabuf_write(struct coda_ctx *ctx, int index, u32 value)
{
	struct coda_dev *dev = ctx->dev;
	u32 *p = ctx->parabuf.vaddr;

	if (dev->devtype->product == CODA_DX6)
		p[index] = value;
	else
		p[index ^ 1] = value;
}

static int coda_alloc_aux_buf(struct coda_dev *dev,
			      struct coda_aux_buf *buf, size_t size)
{
	buf->vaddr = dma_alloc_coherent(&dev->plat_dev->dev, size, &buf->paddr,
					GFP_KERNEL);
	if (!buf->vaddr)
		return -ENOMEM;

	buf->size = size;

	return 0;
}

static inline int coda_alloc_context_buf(struct coda_ctx *ctx,
					 struct coda_aux_buf *buf, size_t size)
{
	return coda_alloc_aux_buf(ctx->dev, buf, size);
}

static void coda_free_aux_buf(struct coda_dev *dev,
			      struct coda_aux_buf *buf)
{
	if (buf->vaddr) {
		dma_free_coherent(&dev->plat_dev->dev, buf->size,
				  buf->vaddr, buf->paddr);
		buf->vaddr = NULL;
		buf->size = 0;
	}
}

static void coda_free_framebuffers(struct coda_ctx *ctx)
{
	int i;

	for (i = 0; i < CODA_MAX_FRAMEBUFFERS; i++)
		coda_free_aux_buf(ctx->dev, &ctx->internal_frames[i]);
}

static int coda_alloc_framebuffers(struct coda_ctx *ctx, struct coda_q_data *q_data, u32 fourcc)
{
	struct coda_dev *dev = ctx->dev;
	int height = q_data->height;
	dma_addr_t paddr;
	int ysize;
	int ret;
	int i;

	if (ctx->codec && ctx->codec->src_fourcc == V4L2_PIX_FMT_H264)
		height = round_up(height, 16);
	ysize = round_up(q_data->width, 8) * height;

	/* Allocate frame buffers */
	for (i = 0; i < ctx->num_internal_frames; i++) {
		size_t size;

		size = q_data->sizeimage;
		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
		    dev->devtype->product != CODA_DX6)
			ctx->internal_frames[i].size += ysize/4;
		ret = coda_alloc_context_buf(ctx, &ctx->internal_frames[i], size);
		if (ret < 0) {
			coda_free_framebuffers(ctx);
			return ret;
		}
	}

	/* Register frame buffers in the parameter buffer */
	for (i = 0; i < ctx->num_internal_frames; i++) {
		paddr = ctx->internal_frames[i].paddr;
		coda_parabuf_write(ctx, i * 3 + 0, paddr); /* Y */
		coda_parabuf_write(ctx, i * 3 + 1, paddr + ysize); /* Cb */
		coda_parabuf_write(ctx, i * 3 + 2, paddr + ysize + ysize/4); /* Cr */

		/* mvcol buffer for h.264 */
		if (ctx->codec->src_fourcc == V4L2_PIX_FMT_H264 &&
		    dev->devtype->product != CODA_DX6)
			coda_parabuf_write(ctx, 96 + i,
					   ctx->internal_frames[i].paddr +
					   ysize + ysize/4 + ysize/4);
	}

	/* mvcol buffer for mpeg4 */
	if ((dev->devtype->product != CODA_DX6) &&
	    (ctx->codec->src_fourcc == V4L2_PIX_FMT_MPEG4))
		coda_parabuf_write(ctx, 97, ctx->internal_frames[i].paddr +
					    ysize + ysize/4 + ysize/4);

	return 0;
}

static int coda_h264_padding(int size, char *p)
{
	int nal_size;
	int diff;

	diff = size - (size & ~0x7);
	if (diff == 0)
		return 0;

	nal_size = coda_filler_size[diff];
	memcpy(p, coda_filler_nal, nal_size);

	/* Add rbsp stop bit and trailing at the end */
	*(p + nal_size - 1) = 0x80;

	return nal_size;
}

static void coda_setup_iram(struct coda_ctx *ctx)
{
	struct coda_iram_info *iram_info = &ctx->iram_info;
	struct coda_dev *dev = ctx->dev;
	int ipacdc_size;
	int bitram_size;
	int dbk_size;
	int mb_width;
	int me_size;
	int size;

	memset(iram_info, 0, sizeof(*iram_info));
	size = dev->iram_size;

	if (dev->devtype->product == CODA_DX6)
		return;

	if (ctx->inst_type == CODA_INST_ENCODER) {
		struct coda_q_data *q_data_src;

		q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
		mb_width = DIV_ROUND_UP(q_data_src->width, 16);

		/* Prioritize in case IRAM is too small for everything */
		me_size = round_up(round_up(q_data_src->width, 16) * 36 + 2048,
				   1024);
		iram_info->search_ram_size = me_size;
		if (size >= iram_info->search_ram_size) {
			if (dev->devtype->product == CODA_7541)
				iram_info->axi_sram_use |= CODA7_USE_HOST_ME_ENABLE;
			iram_info->search_ram_paddr = dev->iram_paddr;
			size -= iram_info->search_ram_size;
		} else {
			pr_err("IRAM is smaller than the search ram size\n");
			goto out;
		}

		/* Only H.264BP and H.263P3 are considered */
		dbk_size = round_up(128 * mb_width, 1024);
		if (size >= dbk_size) {
			iram_info->axi_sram_use |= CODA7_USE_HOST_DBK_ENABLE;
			iram_info->buf_dbk_y_use = dev->iram_paddr +
						   iram_info->search_ram_size;
			iram_info->buf_dbk_c_use = iram_info->buf_dbk_y_use +
						   dbk_size / 2;
			size -= dbk_size;
		} else {
			goto out;
		}

		bitram_size = round_up(128 * mb_width, 1024);
		if (size >= bitram_size) {
			iram_info->axi_sram_use |= CODA7_USE_HOST_BIT_ENABLE;
			iram_info->buf_bit_use = iram_info->buf_dbk_c_use +
						 dbk_size / 2;
			size -= bitram_size;
		} else {
			goto out;
		}

		ipacdc_size = round_up(128 * mb_width, 1024);
		if (size >= ipacdc_size) {
			iram_info->axi_sram_use |= CODA7_USE_HOST_IP_ENABLE;
			iram_info->buf_ip_ac_dc_use = iram_info->buf_bit_use +
						      bitram_size;
			size -= ipacdc_size;
		}

		/* OVL disabled for encoder */
	}

out:
	switch (dev->devtype->product) {
	case CODA_DX6:
		break;
	case CODA_7541:
		/* i.MX53 uses secondary AXI for IRAM access */
		if (iram_info->axi_sram_use & CODA7_USE_HOST_BIT_ENABLE)
			iram_info->axi_sram_use |= CODA7_USE_BIT_ENABLE;
		if (iram_info->axi_sram_use & CODA7_USE_HOST_IP_ENABLE)
			iram_info->axi_sram_use |= CODA7_USE_IP_ENABLE;
		if (iram_info->axi_sram_use & CODA7_USE_HOST_DBK_ENABLE)
			iram_info->axi_sram_use |= CODA7_USE_DBK_ENABLE;
		if (iram_info->axi_sram_use & CODA7_USE_HOST_OVL_ENABLE)
			iram_info->axi_sram_use |= CODA7_USE_OVL_ENABLE;
		if (iram_info->axi_sram_use & CODA7_USE_HOST_ME_ENABLE)
			iram_info->axi_sram_use |= CODA7_USE_ME_ENABLE;
	}

	if (!(iram_info->axi_sram_use & CODA7_USE_HOST_IP_ENABLE))
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "IRAM smaller than needed\n");

	if (dev->devtype->product == CODA_7541) {
		/* TODO - Enabling these causes picture errors on CODA7541 */
		if (ctx->inst_type == CODA_INST_ENCODER) {
			iram_info->axi_sram_use &= ~(CODA7_USE_HOST_IP_ENABLE |
						     CODA7_USE_HOST_DBK_ENABLE |
						     CODA7_USE_IP_ENABLE |
						     CODA7_USE_DBK_ENABLE);
		}
	}
}

static void coda_free_context_buffers(struct coda_ctx *ctx)
{
	struct coda_dev *dev = ctx->dev;

	if (dev->devtype->product != CODA_DX6)
		coda_free_aux_buf(dev, &ctx->workbuf);
}

static int coda_alloc_context_buffers(struct coda_ctx *ctx,
				      struct coda_q_data *q_data)
{
	struct coda_dev *dev = ctx->dev;
	size_t size;
	int ret;

	switch (dev->devtype->product) {
	case CODA_7541:
		size = CODA7_WORK_BUF_SIZE;
		break;
	default:
		return 0;
	}

	if (ctx->workbuf.vaddr) {
		v4l2_err(&dev->v4l2_dev, "context buffer still allocated\n");
		ret = -EBUSY;
		return -ENOMEM;
	}

	ret = coda_alloc_context_buf(ctx, &ctx->workbuf, size);
	if (ret < 0) {
		v4l2_err(&dev->v4l2_dev, "failed to allocate %d byte context buffer",
			 ctx->workbuf.size);
		goto err;
	}

	return 0;

err:
	coda_free_context_buffers(ctx);
	return ret;
}

static int coda_encode_header(struct coda_ctx *ctx, struct vb2_buffer *buf,
			      int header_code, u8 *header, int *size)
{
	struct coda_dev *dev = ctx->dev;
	int ret;

	coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0),
		   CODA_CMD_ENC_HEADER_BB_START);
	coda_write(dev, vb2_plane_size(buf, 0), CODA_CMD_ENC_HEADER_BB_SIZE);
	coda_write(dev, header_code, CODA_CMD_ENC_HEADER_CODE);
	ret = coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER);
	if (ret < 0) {
		v4l2_err(&dev->v4l2_dev, "CODA_COMMAND_ENCODE_HEADER timeout\n");
		return ret;
	}
	*size = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->reg_idx)) -
		coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
	memcpy(header, vb2_plane_vaddr(buf, 0), *size);

	return 0;
}

static int coda_start_streaming(struct vb2_queue *q, unsigned int count)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(q);
	struct v4l2_device *v4l2_dev = &ctx->dev->v4l2_dev;
	u32 bitstream_buf, bitstream_size;
	struct coda_dev *dev = ctx->dev;
	struct coda_q_data *q_data_src, *q_data_dst;
	struct vb2_buffer *buf;
	u32 dst_fourcc;
	u32 value;
	int ret = 0;

	if (count < 1)
		return -EINVAL;

	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
		ctx->streamon_out = 1;
	else
		ctx->streamon_cap = 1;

	q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
	if (ctx->streamon_out) {
		if (coda_format_is_yuv(q_data_src->fourcc))
			ctx->inst_type = CODA_INST_ENCODER;
		else
			ctx->inst_type = CODA_INST_DECODER;
	}

	/* Don't start the coda unless both queues are on */
	if (!(ctx->streamon_out & ctx->streamon_cap))
		return 0;

	ctx->gopcounter = ctx->params.gop_size - 1;
	buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
	bitstream_buf = vb2_dma_contig_plane_dma_addr(buf, 0);
	q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
	bitstream_size = q_data_dst->sizeimage;
	dst_fourcc = q_data_dst->fourcc;

	ctx->codec = coda_find_codec(ctx->dev, q_data_src->fourcc,
				     q_data_dst->fourcc);
	if (!ctx->codec) {
		v4l2_err(v4l2_dev, "couldn't tell instance type.\n");
		return -EINVAL;
	}

	/* Allocate per-instance buffers */
	ret = coda_alloc_context_buffers(ctx, q_data_src);
	if (ret < 0)
		return ret;

	if (!coda_is_initialized(dev)) {
		v4l2_err(v4l2_dev, "coda is not initialized.\n");
		return -EFAULT;
	}

	mutex_lock(&dev->coda_mutex);

	coda_write(dev, ctx->parabuf.paddr, CODA_REG_BIT_PARA_BUF_ADDR);
	coda_write(dev, bitstream_buf, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
	coda_write(dev, bitstream_buf, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
	switch (dev->devtype->product) {
	case CODA_DX6:
		coda_write(dev, CODADX6_STREAM_BUF_DYNALLOC_EN |
			CODADX6_STREAM_BUF_PIC_RESET, CODA_REG_BIT_STREAM_CTRL);
		break;
	default:
		coda_write(dev, CODA7_STREAM_BUF_DYNALLOC_EN |
			CODA7_STREAM_BUF_PIC_RESET, CODA_REG_BIT_STREAM_CTRL);
	}

	if (dev->devtype->product == CODA_DX6) {
		/* Configure the coda */
		coda_write(dev, dev->iram_paddr, CODADX6_REG_BIT_SEARCH_RAM_BASE_ADDR);
	}

	/* Could set rotation here if needed */
	switch (dev->devtype->product) {
	case CODA_DX6:
		value = (q_data_src->width & CODADX6_PICWIDTH_MASK) << CODADX6_PICWIDTH_OFFSET;
		value |= (q_data_src->height & CODADX6_PICHEIGHT_MASK) << CODA_PICHEIGHT_OFFSET;
		break;
	default:
		value = (q_data_src->width & CODA7_PICWIDTH_MASK) << CODA7_PICWIDTH_OFFSET;
		value |= (q_data_src->height & CODA7_PICHEIGHT_MASK) << CODA_PICHEIGHT_OFFSET;
	}
	coda_write(dev, value, CODA_CMD_ENC_SEQ_SRC_SIZE);
	coda_write(dev, ctx->params.framerate,
		   CODA_CMD_ENC_SEQ_SRC_F_RATE);

	ctx->params.codec_mode = ctx->codec->mode;
	switch (dst_fourcc) {
	case V4L2_PIX_FMT_MPEG4:
		coda_write(dev, CODA_STD_MPEG4, CODA_CMD_ENC_SEQ_COD_STD);
		coda_write(dev, 0, CODA_CMD_ENC_SEQ_MP4_PARA);
		break;
	case V4L2_PIX_FMT_H264:
		coda_write(dev, CODA_STD_H264, CODA_CMD_ENC_SEQ_COD_STD);
		coda_write(dev, 0, CODA_CMD_ENC_SEQ_264_PARA);
		break;
	default:
		v4l2_err(v4l2_dev,
			 "dst format (0x%08x) invalid.\n", dst_fourcc);
		ret = -EINVAL;
		goto out;
	}

	switch (ctx->params.slice_mode) {
	case V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE:
		value = 0;
		break;
	case V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_MB:
		value  = (ctx->params.slice_max_mb & CODA_SLICING_SIZE_MASK) << CODA_SLICING_SIZE_OFFSET;
		value |= (1 & CODA_SLICING_UNIT_MASK) << CODA_SLICING_UNIT_OFFSET;
		value |=  1 & CODA_SLICING_MODE_MASK;
		break;
	case V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_BYTES:
		value  = (ctx->params.slice_max_bits & CODA_SLICING_SIZE_MASK) << CODA_SLICING_SIZE_OFFSET;
		value |= (0 & CODA_SLICING_UNIT_MASK) << CODA_SLICING_UNIT_OFFSET;
		value |=  1 & CODA_SLICING_MODE_MASK;
		break;
	}
	coda_write(dev, value, CODA_CMD_ENC_SEQ_SLICE_MODE);
	value = ctx->params.gop_size & CODA_GOP_SIZE_MASK;
	coda_write(dev, value, CODA_CMD_ENC_SEQ_GOP_SIZE);

	if (ctx->params.bitrate) {
		/* Rate control enabled */
		value = (ctx->params.bitrate & CODA_RATECONTROL_BITRATE_MASK) << CODA_RATECONTROL_BITRATE_OFFSET;
		value |=  1 & CODA_RATECONTROL_ENABLE_MASK;
	} else {
		value = 0;
	}
	coda_write(dev, value, CODA_CMD_ENC_SEQ_RC_PARA);

	coda_write(dev, 0, CODA_CMD_ENC_SEQ_RC_BUF_SIZE);
	coda_write(dev, 0, CODA_CMD_ENC_SEQ_INTRA_REFRESH);

	coda_write(dev, bitstream_buf, CODA_CMD_ENC_SEQ_BB_START);
	coda_write(dev, bitstream_size / 1024, CODA_CMD_ENC_SEQ_BB_SIZE);

	/* set default gamma */
	value = (CODA_DEFAULT_GAMMA & CODA_GAMMA_MASK) << CODA_GAMMA_OFFSET;
	coda_write(dev, value, CODA_CMD_ENC_SEQ_RC_GAMMA);

	if (CODA_DEFAULT_GAMMA > 0) {
		if (dev->devtype->product == CODA_DX6)
			value  = 1 << CODADX6_OPTION_GAMMA_OFFSET;
		else
			value  = 1 << CODA7_OPTION_GAMMA_OFFSET;
	} else {
		value = 0;
	}
	coda_write(dev, value, CODA_CMD_ENC_SEQ_OPTION);

	coda_setup_iram(ctx);

	if (dst_fourcc == V4L2_PIX_FMT_H264) {
		value  = (FMO_SLICE_SAVE_BUF_SIZE << 7);
		value |= (0 & CODA_FMOPARAM_TYPE_MASK) << CODA_FMOPARAM_TYPE_OFFSET;
		value |=  0 & CODA_FMOPARAM_SLICENUM_MASK;
		if (dev->devtype->product == CODA_DX6) {
			coda_write(dev, value, CODADX6_CMD_ENC_SEQ_FMO);
		} else {
			coda_write(dev, ctx->iram_info.search_ram_paddr,
					CODA7_CMD_ENC_SEQ_SEARCH_BASE);
			coda_write(dev, ctx->iram_info.search_ram_size,
					CODA7_CMD_ENC_SEQ_SEARCH_SIZE);
		}
	}

	ret = coda_command_sync(ctx, CODA_COMMAND_SEQ_INIT);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "CODA_COMMAND_SEQ_INIT timeout\n");
		goto out;
	}

	if (coda_read(dev, CODA_RET_ENC_SEQ_SUCCESS) == 0) {
		v4l2_err(v4l2_dev, "CODA_COMMAND_SEQ_INIT failed\n");
		ret = -EFAULT;
		goto out;
	}

	ctx->num_internal_frames = 2;
	ret = coda_alloc_framebuffers(ctx, q_data_src, dst_fourcc);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "failed to allocate framebuffers\n");
		goto out;
	}

	coda_write(dev, ctx->num_internal_frames, CODA_CMD_SET_FRAME_BUF_NUM);
	coda_write(dev, round_up(q_data_src->width, 8), CODA_CMD_SET_FRAME_BUF_STRIDE);
	if (dev->devtype->product != CODA_DX6) {
		coda_write(dev, ctx->iram_info.buf_bit_use,
				CODA7_CMD_SET_FRAME_AXI_BIT_ADDR);
		coda_write(dev, ctx->iram_info.buf_ip_ac_dc_use,
				CODA7_CMD_SET_FRAME_AXI_IPACDC_ADDR);
		coda_write(dev, ctx->iram_info.buf_dbk_y_use,
				CODA7_CMD_SET_FRAME_AXI_DBKY_ADDR);
		coda_write(dev, ctx->iram_info.buf_dbk_c_use,
				CODA7_CMD_SET_FRAME_AXI_DBKC_ADDR);
		coda_write(dev, ctx->iram_info.buf_ovl_use,
				CODA7_CMD_SET_FRAME_AXI_OVL_ADDR);
	}
	ret = coda_command_sync(ctx, CODA_COMMAND_SET_FRAME_BUF);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "CODA_COMMAND_SET_FRAME_BUF timeout\n");
		goto out;
	}

	/* Save stream headers */
	buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
	switch (dst_fourcc) {
	case V4L2_PIX_FMT_H264:
		/*
		 * Get SPS in the first frame and copy it to an
		 * intermediate buffer.
		 */
		ret = coda_encode_header(ctx, buf, CODA_HEADER_H264_SPS,
					 &ctx->vpu_header[0][0],
					 &ctx->vpu_header_size[0]);
		if (ret < 0)
			goto out;

		/*
		 * Get PPS in the first frame and copy it to an
		 * intermediate buffer.
		 */
		ret = coda_encode_header(ctx, buf, CODA_HEADER_H264_PPS,
					 &ctx->vpu_header[1][0],
					 &ctx->vpu_header_size[1]);
		if (ret < 0)
			goto out;

		/*
		 * Length of H.264 headers is variable and thus it might not be
		 * aligned for the coda to append the encoded frame. In that is
		 * the case a filler NAL must be added to header 2.
		 */
		ctx->vpu_header_size[2] = coda_h264_padding(
					(ctx->vpu_header_size[0] +
					 ctx->vpu_header_size[1]),
					 ctx->vpu_header[2]);
		break;
	case V4L2_PIX_FMT_MPEG4:
		/*
		 * Get VOS in the first frame and copy it to an
		 * intermediate buffer
		 */
		ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VOS,
					 &ctx->vpu_header[0][0],
					 &ctx->vpu_header_size[0]);
		if (ret < 0)
			goto out;

		ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VIS,
					 &ctx->vpu_header[1][0],
					 &ctx->vpu_header_size[1]);
		if (ret < 0)
			goto out;

		ret = coda_encode_header(ctx, buf, CODA_HEADER_MP4V_VOL,
					 &ctx->vpu_header[2][0],
					 &ctx->vpu_header_size[2]);
		if (ret < 0)
			goto out;
		break;
	default:
		/* No more formats need to save headers at the moment */
		break;
	}

out:
	mutex_unlock(&dev->coda_mutex);
	return ret;
}

static int coda_stop_streaming(struct vb2_queue *q)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(q);
	struct coda_dev *dev = ctx->dev;

	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "%s: output\n", __func__);
		ctx->streamon_out = 0;
	} else {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "%s: capture\n", __func__);
		ctx->streamon_cap = 0;
	}

	/* Don't stop the coda unless both queues are off */
	if (ctx->streamon_out || ctx->streamon_cap)
		return 0;

	cancel_delayed_work(&dev->timeout);

	mutex_lock(&dev->coda_mutex);
	v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
		 "%s: sent command 'SEQ_END' to coda\n", __func__);
	if (coda_command_sync(ctx, CODA_COMMAND_SEQ_END)) {
		v4l2_err(&dev->v4l2_dev,
			 "CODA_COMMAND_SEQ_END failed\n");
		return -ETIMEDOUT;
	}
	mutex_unlock(&dev->coda_mutex);

	coda_free_framebuffers(ctx);

	return 0;
}

static struct vb2_ops coda_qops = {
	.queue_setup		= coda_queue_setup,
	.buf_prepare		= coda_buf_prepare,
	.buf_queue		= coda_buf_queue,
	.wait_prepare		= coda_wait_prepare,
	.wait_finish		= coda_wait_finish,
	.start_streaming	= coda_start_streaming,
	.stop_streaming		= coda_stop_streaming,
};

static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct coda_ctx *ctx =
			container_of(ctrl->handler, struct coda_ctx, ctrls);

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
		 "s_ctrl: id = %d, val = %d\n", ctrl->id, ctrl->val);

	switch (ctrl->id) {
	case V4L2_CID_HFLIP:
		if (ctrl->val)
			ctx->params.rot_mode |= CODA_MIR_HOR;
		else
			ctx->params.rot_mode &= ~CODA_MIR_HOR;
		break;
	case V4L2_CID_VFLIP:
		if (ctrl->val)
			ctx->params.rot_mode |= CODA_MIR_VER;
		else
			ctx->params.rot_mode &= ~CODA_MIR_VER;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE:
		ctx->params.bitrate = ctrl->val / 1000;
		break;
	case V4L2_CID_MPEG_VIDEO_GOP_SIZE:
		ctx->params.gop_size = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:
		ctx->params.h264_intra_qp = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:
		ctx->params.h264_inter_qp = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:
		ctx->params.mpeg4_intra_qp = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:
		ctx->params.mpeg4_inter_qp = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
		ctx->params.slice_mode = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:
		ctx->params.slice_max_mb = ctrl->val;
		break;
	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:
		ctx->params.slice_max_bits = ctrl->val * 8;
		break;
	case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
		break;
	default:
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			"Invalid control, id=%d, val=%d\n",
			ctrl->id, ctrl->val);
		return -EINVAL;
	}

	return 0;
}

static struct v4l2_ctrl_ops coda_ctrl_ops = {
	.s_ctrl = coda_s_ctrl,
};

static int coda_ctrls_setup(struct coda_ctx *ctx)
{
	v4l2_ctrl_handler_init(&ctx->ctrls, 9);

	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_BITRATE, 0, 32767000, 1, 0);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_GOP_SIZE, 1, 60, 1, 16);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP, 1, 51, 1, 25);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP, 1, 51, 1, 25);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP, 1, 31, 1, 2);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP, 1, 31, 1, 2);
	v4l2_ctrl_new_std_menu(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE,
		V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_BYTES, 0x0,
		V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB, 1, 0x3fffffff, 1, 1);
	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES, 1, 0x3fffffff, 1, 500);
	v4l2_ctrl_new_std_menu(&ctx->ctrls, &coda_ctrl_ops,
		V4L2_CID_MPEG_VIDEO_HEADER_MODE,
		V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME,
		(1 << V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE),
		V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME);

	if (ctx->ctrls.error) {
		v4l2_err(&ctx->dev->v4l2_dev, "control initialization error (%d)",
			ctx->ctrls.error);
		return -EINVAL;
	}

	return v4l2_ctrl_handler_setup(&ctx->ctrls);
}

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

	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	src_vq->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR;
	src_vq->drv_priv = ctx;
	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	src_vq->ops = &coda_qops;
	src_vq->mem_ops = &vb2_dma_contig_memops;
	src_vq->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_COPY;

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

	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	dst_vq->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR;
	dst_vq->drv_priv = ctx;
	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	dst_vq->ops = &coda_qops;
	dst_vq->mem_ops = &vb2_dma_contig_memops;
	dst_vq->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_COPY;

	return vb2_queue_init(dst_vq);
}

static int coda_next_free_instance(struct coda_dev *dev)
{
	return ffz(dev->instance_mask);
}

static int coda_open(struct file *file)
{
	struct coda_dev *dev = video_drvdata(file);
	struct coda_ctx *ctx = NULL;
	int ret = 0;
	int idx;

	idx = coda_next_free_instance(dev);
	if (idx >= CODA_MAX_INSTANCES)
		return -EBUSY;
	set_bit(idx, &dev->instance_mask);

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

	v4l2_fh_init(&ctx->fh, video_devdata(file));
	file->private_data = &ctx->fh;
	v4l2_fh_add(&ctx->fh);
	ctx->dev = dev;
	ctx->idx = idx;
	switch (dev->devtype->product) {
	case CODA_7541:
		ctx->reg_idx = 0;
		break;
	default:
		ctx->reg_idx = idx;
	}
	set_default_params(ctx);
	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx,
					 &coda_queue_init);
	if (IS_ERR(ctx->m2m_ctx)) {
		ret = PTR_ERR(ctx->m2m_ctx);

		v4l2_err(&dev->v4l2_dev, "%s return error (%d)\n",
			 __func__, ret);
		goto err;
	}
	ret = coda_ctrls_setup(ctx);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "failed to setup coda controls\n");
		goto err;
	}

	ctx->fh.ctrl_handler = &ctx->ctrls;

	ret = coda_alloc_context_buf(ctx, &ctx->parabuf, CODA_PARA_BUF_SIZE);
	if (ret < 0) {
		v4l2_err(&dev->v4l2_dev, "failed to allocate parabuf");
		goto err;
	}

	ctx->bitstream.size = CODA_MAX_FRAME_SIZE;
	ctx->bitstream.vaddr = dma_alloc_writecombine(&dev->plat_dev->dev,
			ctx->bitstream.size, &ctx->bitstream.paddr, GFP_KERNEL);
	if (!ctx->bitstream.vaddr) {
		v4l2_err(&dev->v4l2_dev, "failed to allocate bitstream ringbuffer");
		ret = -ENOMEM;
		goto err;
	}
	kfifo_init(&ctx->bitstream_fifo,
		ctx->bitstream.vaddr, ctx->bitstream.size);
	mutex_init(&ctx->bitstream_mutex);

	coda_lock(ctx);
	list_add(&ctx->list, &dev->instances);
	coda_unlock(ctx);

	clk_prepare_enable(dev->clk_per);
	clk_prepare_enable(dev->clk_ahb);

	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Created instance %d (%p)\n",
		 ctx->idx, ctx);

	return 0;

err:
	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	kfree(ctx);
	return ret;
}

static int coda_release(struct file *file)
{
	struct coda_dev *dev = video_drvdata(file);
	struct coda_ctx *ctx = fh_to_ctx(file->private_data);

	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Releasing instance %p\n",
		 ctx);

	coda_lock(ctx);
	list_del(&ctx->list);
	coda_unlock(ctx);

	dma_free_writecombine(&dev->plat_dev->dev, ctx->bitstream.size,
		ctx->bitstream.vaddr, ctx->bitstream.paddr);
	coda_free_context_buffers(ctx);
	if (ctx->dev->devtype->product == CODA_DX6)
		coda_free_aux_buf(dev, &ctx->workbuf);

	coda_free_aux_buf(dev, &ctx->parabuf);
	v4l2_ctrl_handler_free(&ctx->ctrls);
	clk_disable_unprepare(dev->clk_per);
	clk_disable_unprepare(dev->clk_ahb);
	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	clear_bit(ctx->idx, &dev->instance_mask);
	kfree(ctx);

	return 0;
}

static unsigned int coda_poll(struct file *file,
				 struct poll_table_struct *wait)
{
	struct coda_ctx *ctx = fh_to_ctx(file->private_data);
	int ret;

	coda_lock(ctx);
	ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
	coda_unlock(ctx);
	return ret;
}

static int coda_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct coda_ctx *ctx = fh_to_ctx(file->private_data);

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

static const struct v4l2_file_operations coda_fops = {
	.owner		= THIS_MODULE,
	.open		= coda_open,
	.release	= coda_release,
	.poll		= coda_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= coda_mmap,
};

static irqreturn_t coda_irq_handler(int irq, void *data)
{
	struct vb2_buffer *src_buf, *dst_buf;
	struct coda_dev *dev = data;
	u32 wr_ptr, start_ptr;
	struct coda_ctx *ctx;

	cancel_delayed_work(&dev->timeout);

	/* read status register to attend the IRQ */
	coda_read(dev, CODA_REG_BIT_INT_STATUS);
	coda_write(dev, CODA_REG_BIT_INT_CLEAR_SET,
		      CODA_REG_BIT_INT_CLEAR);

	ctx = v4l2_m2m_get_curr_priv(dev->m2m_dev);
	if (ctx == NULL) {
		v4l2_err(&dev->v4l2_dev, "Instance released before the end of transaction\n");
		mutex_unlock(&dev->coda_mutex);
		return IRQ_HANDLED;
	}

	if (ctx->aborting) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "task has been aborted\n");
		mutex_unlock(&dev->coda_mutex);
		return IRQ_HANDLED;
	}

	if (coda_isbusy(ctx->dev)) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "coda is still busy!!!!\n");
		return IRQ_NONE;
	}

	src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
	dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);

	/* Get results from the coda */
	coda_read(dev, CODA_RET_ENC_PIC_TYPE);
	start_ptr = coda_read(dev, CODA_CMD_ENC_PIC_BB_START);
	wr_ptr = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->reg_idx));

	/* Calculate bytesused field */
	if (dst_buf->v4l2_buf.sequence == 0) {
		vb2_set_plane_payload(dst_buf, 0, wr_ptr - start_ptr +
					ctx->vpu_header_size[0] +
					ctx->vpu_header_size[1] +
					ctx->vpu_header_size[2]);
	} else {
		vb2_set_plane_payload(dst_buf, 0, wr_ptr - start_ptr);
	}

	v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev, "frame size = %u\n",
		 wr_ptr - start_ptr);

	coda_read(dev, CODA_RET_ENC_PIC_SLICE_NUM);
	coda_read(dev, CODA_RET_ENC_PIC_FLAG);

	if (src_buf->v4l2_buf.flags & V4L2_BUF_FLAG_KEYFRAME) {
		dst_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_KEYFRAME;
		dst_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_PFRAME;
	} else {
		dst_buf->v4l2_buf.flags |= V4L2_BUF_FLAG_PFRAME;
		dst_buf->v4l2_buf.flags &= ~V4L2_BUF_FLAG_KEYFRAME;
	}

	dst_buf->v4l2_buf.timestamp = src_buf->v4l2_buf.timestamp;
	dst_buf->v4l2_buf.timecode = src_buf->v4l2_buf.timecode;

	v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
	v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);

	ctx->gopcounter--;
	if (ctx->gopcounter < 0)
		ctx->gopcounter = ctx->params.gop_size - 1;

	v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
		"job finished: encoding frame (%d) (%s)\n",
		dst_buf->v4l2_buf.sequence,
		(dst_buf->v4l2_buf.flags & V4L2_BUF_FLAG_KEYFRAME) ?
		"KEYFRAME" : "PFRAME");

	mutex_unlock(&dev->coda_mutex);

	v4l2_m2m_job_finish(ctx->dev->m2m_dev, ctx->m2m_ctx);

	return IRQ_HANDLED;
}

static void coda_timeout(struct work_struct *work)
{
	struct coda_ctx *ctx;
	struct coda_dev *dev = container_of(to_delayed_work(work),
					    struct coda_dev, timeout);

	dev_err(&dev->plat_dev->dev, "CODA PIC_RUN timeout, stopping all streams\n");

	mutex_lock(&dev->dev_mutex);
	list_for_each_entry(ctx, &dev->instances, list) {
		v4l2_m2m_streamoff(NULL, ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
		v4l2_m2m_streamoff(NULL, ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
	}
	mutex_unlock(&dev->dev_mutex);

	mutex_unlock(&dev->coda_mutex);
	ctx = v4l2_m2m_get_curr_priv(dev->m2m_dev);
	v4l2_m2m_job_finish(ctx->dev->m2m_dev, ctx->m2m_ctx);
}

static u32 coda_supported_firmwares[] = {
	CODA_FIRMWARE_VERNUM(CODA_DX6, 2, 2, 5),
	CODA_FIRMWARE_VERNUM(CODA_7541, 1, 4, 50),
};

static bool coda_firmware_supported(u32 vernum)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(coda_supported_firmwares); i++)
		if (vernum == coda_supported_firmwares[i])
			return true;
	return false;
}

static char *coda_product_name(int product)
{
	static char buf[9];

	switch (product) {
	case CODA_DX6:
		return "CodaDx6";
	case CODA_7541:
		return "CODA7541";
	default:
		snprintf(buf, sizeof(buf), "(0x%04x)", product);
		return buf;
	}
}

static int coda_hw_init(struct coda_dev *dev)
{
	u16 product, major, minor, release;
	u32 data;
	u16 *p;
	int i;

	clk_prepare_enable(dev->clk_per);
	clk_prepare_enable(dev->clk_ahb);

	/*
	 * Copy the first CODA_ISRAM_SIZE in the internal SRAM.
	 * The 16-bit chars in the code buffer are in memory access
	 * order, re-sort them to CODA order for register download.
	 * Data in this SRAM survives a reboot.
	 */
	p = (u16 *)dev->codebuf.vaddr;
	if (dev->devtype->product == CODA_DX6) {
		for (i = 0; i < (CODA_ISRAM_SIZE / 2); i++)  {
			data = CODA_DOWN_ADDRESS_SET(i) |
				CODA_DOWN_DATA_SET(p[i ^ 1]);
			coda_write(dev, data, CODA_REG_BIT_CODE_DOWN);
		}
	} else {
		for (i = 0; i < (CODA_ISRAM_SIZE / 2); i++) {
			data = CODA_DOWN_ADDRESS_SET(i) |
				CODA_DOWN_DATA_SET(p[round_down(i, 4) +
							3 - (i % 4)]);
			coda_write(dev, data, CODA_REG_BIT_CODE_DOWN);
		}
	}

	/* Clear registers */
	for (i = 0; i < 64; i++)
		coda_write(dev, 0, CODA_REG_BIT_CODE_BUF_ADDR + i * 4);

	/* Tell the BIT where to find everything it needs */
	if (dev->devtype->product == CODA_7541) {
		coda_write(dev, dev->tempbuf.paddr,
				CODA_REG_BIT_TEMP_BUF_ADDR);
	} else {
		coda_write(dev, dev->workbuf.paddr,
			      CODA_REG_BIT_WORK_BUF_ADDR);
	}
	coda_write(dev, dev->codebuf.paddr,
		      CODA_REG_BIT_CODE_BUF_ADDR);
	coda_write(dev, 0, CODA_REG_BIT_CODE_RUN);

	/* Set default values */
	switch (dev->devtype->product) {
	case CODA_DX6:
		coda_write(dev, CODADX6_STREAM_BUF_PIC_FLUSH, CODA_REG_BIT_STREAM_CTRL);
		break;
	default:
		coda_write(dev, CODA7_STREAM_BUF_PIC_FLUSH, CODA_REG_BIT_STREAM_CTRL);
	}
	coda_write(dev, 0, CODA_REG_BIT_FRAME_MEM_CTRL);

	if (dev->devtype->product != CODA_DX6)
		coda_write(dev, 0, CODA7_REG_BIT_AXI_SRAM_USE);

	coda_write(dev, CODA_INT_INTERRUPT_ENABLE,
		      CODA_REG_BIT_INT_ENABLE);

	/* Reset VPU and start processor */
	data = coda_read(dev, CODA_REG_BIT_CODE_RESET);
	data |= CODA_REG_RESET_ENABLE;
	coda_write(dev, data, CODA_REG_BIT_CODE_RESET);
	udelay(10);
	data &= ~CODA_REG_RESET_ENABLE;
	coda_write(dev, data, CODA_REG_BIT_CODE_RESET);
	coda_write(dev, CODA_REG_RUN_ENABLE, CODA_REG_BIT_CODE_RUN);

	/* Load firmware */
	coda_write(dev, 0, CODA_CMD_FIRMWARE_VERNUM);
	coda_write(dev, CODA_REG_BIT_BUSY_FLAG, CODA_REG_BIT_BUSY);
	coda_write(dev, 0, CODA_REG_BIT_RUN_INDEX);
	coda_write(dev, 0, CODA_REG_BIT_RUN_COD_STD);
	coda_write(dev, CODA_COMMAND_FIRMWARE_GET, CODA_REG_BIT_RUN_COMMAND);
	if (coda_wait_timeout(dev)) {
		clk_disable_unprepare(dev->clk_per);
		clk_disable_unprepare(dev->clk_ahb);
		v4l2_err(&dev->v4l2_dev, "firmware get command error\n");
		return -EIO;
	}

	/* Check we are compatible with the loaded firmware */
	data = coda_read(dev, CODA_CMD_FIRMWARE_VERNUM);
	product = CODA_FIRMWARE_PRODUCT(data);
	major = CODA_FIRMWARE_MAJOR(data);
	minor = CODA_FIRMWARE_MINOR(data);
	release = CODA_FIRMWARE_RELEASE(data);

	clk_disable_unprepare(dev->clk_per);
	clk_disable_unprepare(dev->clk_ahb);

	if (product != dev->devtype->product) {
		v4l2_err(&dev->v4l2_dev, "Wrong firmware. Hw: %s, Fw: %s,"
			 " Version: %u.%u.%u\n",
			 coda_product_name(dev->devtype->product),
			 coda_product_name(product), major, minor, release);
		return -EINVAL;
	}

	v4l2_info(&dev->v4l2_dev, "Initialized %s.\n",
		  coda_product_name(product));

	if (coda_firmware_supported(data)) {
		v4l2_info(&dev->v4l2_dev, "Firmware version: %u.%u.%u\n",
			  major, minor, release);
	} else {
		v4l2_warn(&dev->v4l2_dev, "Unsupported firmware version: "
			  "%u.%u.%u\n", major, minor, release);
	}

	return 0;
}

static void coda_fw_callback(const struct firmware *fw, void *context)
{
	struct coda_dev *dev = context;
	struct platform_device *pdev = dev->plat_dev;
	int ret;

	if (!fw) {
		v4l2_err(&dev->v4l2_dev, "firmware request failed\n");
		return;
	}

	/* allocate auxiliary per-device code buffer for the BIT processor */
	ret = coda_alloc_aux_buf(dev, &dev->codebuf, fw->size);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to allocate code buffer\n");
		return;
	}

	/* Copy the whole firmware image to the code buffer */
	memcpy(dev->codebuf.vaddr, fw->data, fw->size);
	release_firmware(fw);

	ret = coda_hw_init(dev);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "HW initialization failed\n");
		return;
	}

	dev->vfd.fops	= &coda_fops,
	dev->vfd.ioctl_ops	= &coda_ioctl_ops;
	dev->vfd.release	= video_device_release_empty,
	dev->vfd.lock	= &dev->dev_mutex;
	dev->vfd.v4l2_dev	= &dev->v4l2_dev;
	dev->vfd.vfl_dir	= VFL_DIR_M2M;
	snprintf(dev->vfd.name, sizeof(dev->vfd.name), "%s", CODA_NAME);
	video_set_drvdata(&dev->vfd, dev);

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

	dev->m2m_dev = v4l2_m2m_init(&coda_m2m_ops);
	if (IS_ERR(dev->m2m_dev)) {
		v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
		goto rel_ctx;
	}

	ret = video_register_device(&dev->vfd, VFL_TYPE_GRABBER, 0);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
		goto rel_m2m;
	}
	v4l2_info(&dev->v4l2_dev, "codec registered as /dev/video%d\n",
		  dev->vfd.num);

	return;

rel_m2m:
	v4l2_m2m_release(dev->m2m_dev);
rel_ctx:
	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
}

static int coda_firmware_request(struct coda_dev *dev)
{
	char *fw = dev->devtype->firmware;

	dev_dbg(&dev->plat_dev->dev, "requesting firmware '%s' for %s\n", fw,
		coda_product_name(dev->devtype->product));

	return request_firmware_nowait(THIS_MODULE, true,
		fw, &dev->plat_dev->dev, GFP_KERNEL, dev, coda_fw_callback);
}

enum coda_platform {
	CODA_IMX27,
	CODA_IMX53,
};

static const struct coda_devtype coda_devdata[] = {
	[CODA_IMX27] = {
		.firmware   = "v4l-codadx6-imx27.bin",
		.product    = CODA_DX6,
		.codecs     = codadx6_codecs,
		.num_codecs = ARRAY_SIZE(codadx6_codecs),
	},
	[CODA_IMX53] = {
		.firmware   = "v4l-coda7541-imx53.bin",
		.product    = CODA_7541,
		.codecs     = coda7_codecs,
		.num_codecs = ARRAY_SIZE(coda7_codecs),
	},
};

static struct platform_device_id coda_platform_ids[] = {
	{ .name = "coda-imx27", .driver_data = CODA_IMX27 },
	{ .name = "coda-imx53", .driver_data = CODA_IMX53 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, coda_platform_ids);

#ifdef CONFIG_OF
static const struct of_device_id coda_dt_ids[] = {
	{ .compatible = "fsl,imx27-vpu", .data = &coda_platform_ids[CODA_IMX27] },
	{ .compatible = "fsl,imx53-vpu", .data = &coda_devdata[CODA_IMX53] },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, coda_dt_ids);
#endif

static int coda_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id =
			of_match_device(of_match_ptr(coda_dt_ids), &pdev->dev);
	const struct platform_device_id *pdev_id;
	struct coda_platform_data *pdata = pdev->dev.platform_data;
	struct device_node *np = pdev->dev.of_node;
	struct gen_pool *pool;
	struct coda_dev *dev;
	struct resource *res;
	int ret, irq;

	dev = devm_kzalloc(&pdev->dev, sizeof *dev, GFP_KERNEL);
	if (!dev) {
		dev_err(&pdev->dev, "Not enough memory for %s\n",
			CODA_NAME);
		return -ENOMEM;
	}

	spin_lock_init(&dev->irqlock);
	INIT_LIST_HEAD(&dev->instances);
	INIT_DELAYED_WORK(&dev->timeout, coda_timeout);

	dev->plat_dev = pdev;
	dev->clk_per = devm_clk_get(&pdev->dev, "per");
	if (IS_ERR(dev->clk_per)) {
		dev_err(&pdev->dev, "Could not get per clock\n");
		return PTR_ERR(dev->clk_per);
	}

	dev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
	if (IS_ERR(dev->clk_ahb)) {
		dev_err(&pdev->dev, "Could not get ahb clock\n");
		return PTR_ERR(dev->clk_ahb);
	}

	/* Get  memory for physical registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to get memory region resource\n");
		return -ENOENT;
	}

	dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dev->regs_base))
		return PTR_ERR(dev->regs_base);

	/* IRQ */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get irq resource\n");
		return -ENOENT;
	}

	if (devm_request_irq(&pdev->dev, irq, coda_irq_handler,
		0, CODA_NAME, dev) < 0) {
		dev_err(&pdev->dev, "failed to request irq\n");
		return -ENOENT;
	}

	/* Get IRAM pool from device tree or platform data */
	pool = of_get_named_gen_pool(np, "iram", 0);
	if (!pool && pdata)
		pool = dev_get_gen_pool(pdata->iram_dev);
	if (!pool) {
		dev_err(&pdev->dev, "iram pool not available\n");
		return -ENOMEM;
	}
	dev->iram_pool = pool;

	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
	if (ret)
		return ret;

	mutex_init(&dev->dev_mutex);
	mutex_init(&dev->coda_mutex);

	pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);

	if (of_id) {
		dev->devtype = of_id->data;
	} else if (pdev_id) {
		dev->devtype = &coda_devdata[pdev_id->driver_data];
	} else {
		v4l2_device_unregister(&dev->v4l2_dev);
		return -EINVAL;
	}

	/* allocate auxiliary per-device buffers for the BIT processor */
	switch (dev->devtype->product) {
	case CODA_DX6:
		ret = coda_alloc_aux_buf(dev, &dev->workbuf,
					 CODADX6_WORK_BUF_SIZE);
		if (ret < 0) {
			dev_err(&pdev->dev, "failed to allocate work buffer\n");
			v4l2_device_unregister(&dev->v4l2_dev);
			return ret;
		}
		break;
	case CODA_7541:
		dev->tempbuf.size = CODA7_TEMP_BUF_SIZE;
		break;
	}
	if (dev->tempbuf.size) {
		ret = coda_alloc_aux_buf(dev, &dev->tempbuf,
					 dev->tempbuf.size);
		if (ret < 0) {
			dev_err(&pdev->dev, "failed to allocate temp buffer\n");
			v4l2_device_unregister(&dev->v4l2_dev);
			return ret;
		}
	}

	if (dev->devtype->product == CODA_DX6)
		dev->iram_size = CODADX6_IRAM_SIZE;
	else
		dev->iram_size = CODA7_IRAM_SIZE;
	dev->iram_vaddr = gen_pool_alloc(dev->iram_pool, dev->iram_size);
	if (!dev->iram_vaddr) {
		dev_err(&pdev->dev, "unable to alloc iram\n");
		return -ENOMEM;
	}
	dev->iram_paddr = gen_pool_virt_to_phys(dev->iram_pool,
						dev->iram_vaddr);

	platform_set_drvdata(pdev, dev);

	return coda_firmware_request(dev);
}

static int coda_remove(struct platform_device *pdev)
{
	struct coda_dev *dev = platform_get_drvdata(pdev);

	video_unregister_device(&dev->vfd);
	if (dev->m2m_dev)
		v4l2_m2m_release(dev->m2m_dev);
	if (dev->alloc_ctx)
		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
	v4l2_device_unregister(&dev->v4l2_dev);
	if (dev->iram_vaddr)
		gen_pool_free(dev->iram_pool, dev->iram_vaddr, dev->iram_size);
	coda_free_aux_buf(dev, &dev->codebuf);
	coda_free_aux_buf(dev, &dev->tempbuf);
	coda_free_aux_buf(dev, &dev->workbuf);
	return 0;
}

static struct platform_driver coda_driver = {
	.probe	= coda_probe,
	.remove	= coda_remove,
	.driver	= {
		.name	= CODA_NAME,
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(coda_dt_ids),
	},
	.id_table = coda_platform_ids,
};

module_platform_driver(coda_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
MODULE_DESCRIPTION("Coda multi-standard codec V4L2 driver");