linux/drivers/media/platform/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/interrupt.h>
#include <linux/io.h>
#include <linux/irq.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 <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	(512 * 1024 + CODA_FMO_BUF_SIZE * 8 * 1024)
#define CODA_PARA_BUF_SIZE	(10 * 1024)
#define CODA_ISRAM_SIZE	(2048 * 2)

#define CODA_OUTPUT_BUFS	4
#define CODA_CAPTURE_BUFS	2

#define MAX_W		720
#define MAX_H		576
#define CODA_MAX_FRAME_SIZE	0x90000
#define FMO_SLICE_SAVE_BUF_SIZE         (32)
#define CODA_DEFAULT_GAMMA		4096

#define MIN_W 176
#define MIN_H 144
#define MAX_W 720
#define MAX_H 576

#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, 0);
MODULE_PARM_DESC(coda_debug, "Debug level (0-1)");

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

enum coda_fmt_type {
	CODA_FMT_ENC,
	CODA_FMT_RAW,
};

enum coda_inst_type {
	CODA_INST_ENCODER,
	CODA_INST_DECODER,
};

enum coda_product {
	CODA_DX6 = 0xf001,
};

struct coda_fmt {
	char *name;
	u32 fourcc;
	enum coda_fmt_type type;
};

struct coda_devtype {
	char			*firmware;
	enum coda_product	product;
	struct coda_fmt		*formats;
	unsigned int		num_formats;
	size_t			workbuf_size;
};

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

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	workbuf;

	spinlock_t		irqlock;
	struct mutex		dev_mutex;
	struct v4l2_m2m_dev	*m2m_dev;
	struct vb2_alloc_ctx	*alloc_ctx;
	int			instances;
};

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

struct coda_ctx {
	struct coda_dev			*dev;
	int				aborting;
	int				rawstreamon;
	int				compstreamon;
	u32				isequence;
	struct coda_q_data		q_data[2];
	enum coda_inst_type		inst_type;
	enum v4l2_colorspace		colorspace;
	struct coda_params		params;
	struct v4l2_m2m_ctx		*m2m_ctx;
	struct v4l2_ctrl_handler	ctrls;
	struct v4l2_fh			fh;
	struct vb2_buffer		*reference;
	int				gopcounter;
	char				vpu_header[3][64];
	int				vpu_header_size[3];
	struct coda_aux_buf		parabuf;
	int				idx;
};

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;
	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, 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;
}

/*
 * Add one array of supported formats for each version of Coda:
 *  i.MX27 -> codadx6
 *  i.MX51 -> coda7
 *  i.MX6  -> coda960
 */
static struct coda_fmt codadx6_formats[] = {
	{
		.name = "YUV 4:2:0 Planar",
		.fourcc = V4L2_PIX_FMT_YUV420,
		.type = CODA_FMT_RAW,
	},
	{
		.name = "H264 Encoded Stream",
		.fourcc = V4L2_PIX_FMT_H264,
		.type = CODA_FMT_ENC,
	},
	{
		.name = "MPEG4 Encoded Stream",
		.fourcc = V4L2_PIX_FMT_MPEG4,
		.type = CODA_FMT_ENC,
	},
};

static struct coda_fmt *find_format(struct coda_dev *dev, struct v4l2_format *f)
{
	struct coda_fmt *formats = dev->devtype->formats;
	int num_formats = dev->devtype->num_formats;
	unsigned int k;

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

	if (k == num_formats)
		return NULL;

	return &formats[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, CODA_NAME, sizeof(cap->bus_info));
	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
				| 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 coda_fmt_type type)
{
	struct coda_ctx *ctx = fh_to_ctx(priv);
	struct coda_dev *dev = ctx->dev;
	struct coda_fmt *formats = dev->devtype->formats;
	struct coda_fmt *fmt;
	int num_formats = dev->devtype->num_formats;
	int i, num = 0;

	for (i = 0; i < num_formats; i++) {
		if (formats[i].type == type) {
			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, CODA_FMT_ENC);
}

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

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->fmt->fourcc;
	f->fmt.pix.width	= q_data->width;
	f->fmt.pix.height	= q_data->height;
	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420)
		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_dev *dev, struct v4l2_format *f)
{
	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 (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420) {
		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);
		f->fmt.pix.bytesperline = round_up(f->fmt.pix.width, 2);
		f->fmt.pix.sizeimage = f->fmt.pix.height *
					f->fmt.pix.bytesperline;
	} 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)
{
	int ret;
	struct coda_fmt *fmt;
	struct coda_ctx *ctx = fh_to_ctx(priv);

	fmt = find_format(ctx->dev, f);
	/*
	 * Since decoding support is not implemented yet do not allow
	 * CODA_FMT_RAW formats in the capture interface.
	 */
	if (!fmt || !(fmt->type == CODA_FMT_ENC))
		f->fmt.pix.pixelformat = V4L2_PIX_FMT_H264;

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

	ret = vidioc_try_fmt(ctx->dev, f);
	if (ret < 0)
		return ret;

	return 0;
}

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_fmt *fmt;
	int ret;

	fmt = find_format(ctx->dev, f);
	/*
	 * Since decoding support is not implemented yet do not allow
	 * CODA_FMT formats in the capture interface.
	 */
	if (!fmt || !(fmt->type == CODA_FMT_RAW))
		f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420;

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

	ret = vidioc_try_fmt(ctx->dev, f);
	if (ret < 0)
		return ret;

	return 0;
}

static int vidioc_s_fmt(struct coda_ctx *ctx, struct v4l2_format *f)
{
	struct coda_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(ctx->dev, f);
	if (ret)
		return ret;

	q_data->fmt = find_format(ctx->dev, 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 { /* encoded format h.264/mpeg-4 */
		q_data->sizeimage = CODA_MAX_FRAME_SIZE;
	}

	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->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(fh_to_ctx(priv), 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_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_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_dqbuf		= vidioc_dqbuf,

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

/*
 * 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;

	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->fmt->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, 0, 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);
	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;

	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);
	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.
	 */
	if (!v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) ||
		!v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx)) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: not enough video buffers.\n");
		return 0;
	}

	/* For P frames a reference picture is needed too */
	if ((ctx->gopcounter != (ctx->params.gop_size - 1)) &&
	   !ctx->reference) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: reference picture not available.\n");
		return 0;
	}

	if (coda_isbusy(ctx->dev)) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "not ready: coda is still busy.\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;
	struct coda_dev *dev = ctx->dev;

	ctx->aborting = 1;

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

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

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)
{
	struct coda_dev *dev = ctx->dev;

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

	/* Default formats for output and input queues */
	ctx->q_data[V4L2_M2M_SRC].fmt = &dev->devtype->formats[0];
	ctx->q_data[V4L2_M2M_DST].fmt = &dev->devtype->formats[1];
	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);
	unsigned int size;

	if (vq->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		*nbuffers = CODA_OUTPUT_BUFS;
		if (fmt)
			size = fmt->fmt.pix.width *
				fmt->fmt.pix.height * 3 / 2;
		else
			size = MAX_W *
				MAX_H * 3 / 2;
	} else {
		*nbuffers = CODA_CAPTURE_BUFS;
		size = CODA_MAX_FRAME_SIZE;
	}

	*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;
	}

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

	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 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;
	u32 dst_fourcc;
	struct vb2_buffer *buf;
	struct vb2_queue *src_vq;
	u32 value;
	int i = 0;

	if (count < 1)
		return -EINVAL;

	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
		ctx->rawstreamon = 1;
	else
		ctx->compstreamon = 1;

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

	ctx->gopcounter = ctx->params.gop_size - 1;

	q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
	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->fmt->fourcc;

	/* Find out whether coda must encode or decode */
	if (q_data_src->fmt->type == CODA_FMT_RAW &&
	    q_data_dst->fmt->type == CODA_FMT_ENC) {
		ctx->inst_type = CODA_INST_ENCODER;
	} else if (q_data_src->fmt->type == CODA_FMT_ENC &&
		   q_data_dst->fmt->type == CODA_FMT_RAW) {
		ctx->inst_type = CODA_INST_DECODER;
		v4l2_err(v4l2_dev, "decoding not supported.\n");
		return -EINVAL;
	} else {
		v4l2_err(v4l2_dev, "couldn't tell instance type.\n");
		return -EINVAL;
	}

	if (!coda_is_initialized(dev)) {
		v4l2_err(v4l2_dev, "coda is not initialized.\n");
		return -EFAULT;
	}
	coda_write(dev, ctx->parabuf.paddr, CODA_REG_BIT_PARA_BUF_ADDR);
	coda_write(dev, bitstream_buf, CODA_REG_BIT_RD_PTR(ctx->idx));
	coda_write(dev, bitstream_buf, CODA_REG_BIT_WR_PTR(ctx->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);
	}

	/* Configure the coda */
	coda_write(dev, 0xffff4c00, CODA_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;
		break;
	default:
		value = (q_data_src->width & CODA7_PICWIDTH_MASK) << CODA7_PICWIDTH_OFFSET;
	}
	value |= (q_data_src->height & CODA_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);

	switch (dst_fourcc) {
	case V4L2_PIX_FMT_MPEG4:
		if (dev->devtype->product == CODA_DX6)
			ctx->params.codec_mode = CODADX6_MODE_ENCODE_MP4;
		else
			ctx->params.codec_mode = CODA7_MODE_ENCODE_MP4;

		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:
		if (dev->devtype->product == CODA_DX6)
			ctx->params.codec_mode = CODADX6_MODE_ENCODE_H264;
		else
			ctx->params.codec_mode = CODA7_MODE_ENCODE_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);
		return -EINVAL;
	}

	value  = (ctx->params.slice_max_mb & CODA_SLICING_SIZE_MASK) << CODA_SLICING_SIZE_OFFSET;
	value |= (1 & CODA_SLICING_UNIT_MASK) << CODA_SLICING_UNIT_OFFSET;
	if (ctx->params.slice_mode == V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_MB)
		value |=  1 & CODA_SLICING_MODE_MASK;
	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);

	value  = (CODA_DEFAULT_GAMMA > 0) << CODA_OPTION_GAMMA_OFFSET;
	value |= (0 & CODA_OPTION_SLICEREPORT_MASK) << CODA_OPTION_SLICEREPORT_OFFSET;
	coda_write(dev, value, CODA_CMD_ENC_SEQ_OPTION);

	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;
		coda_write(dev, value, CODA_CMD_ENC_SEQ_FMO);
	}

	if (coda_command_sync(ctx, CODA_COMMAND_SEQ_INIT)) {
		v4l2_err(v4l2_dev, "CODA_COMMAND_SEQ_INIT timeout\n");
		return -ETIMEDOUT;
	}

	if (coda_read(dev, CODA_RET_ENC_SEQ_SUCCESS) == 0)
		return -EFAULT;

	/*
	 * Walk the src buffer list and let the codec know the
	 * addresses of the pictures.
	 */
	src_vq = v4l2_m2m_get_vq(ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
	for (i = 0; i < src_vq->num_buffers; i++) {
		u32 *p;

		buf = src_vq->bufs[i];
		p = ctx->parabuf.vaddr;

		p[i * 3] = vb2_dma_contig_plane_dma_addr(buf, 0);
		p[i * 3 + 1] = p[i * 3] + q_data_src->width *
				q_data_src->height;
		p[i * 3 + 2] = p[i * 3 + 1] + q_data_src->width / 2 *
				q_data_src->height / 2;
	}

	coda_write(dev, src_vq->num_buffers, CODA_CMD_SET_FRAME_BUF_NUM);
	coda_write(dev, q_data_src->width, CODA_CMD_SET_FRAME_BUF_STRIDE);
	if (coda_command_sync(ctx, CODA_COMMAND_SET_FRAME_BUF)) {
		v4l2_err(v4l2_dev, "CODA_COMMAND_SET_FRAME_BUF timeout\n");
		return -ETIMEDOUT;
	}

	/* 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.
		 */
		coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0), CODA_CMD_ENC_HEADER_BB_START);
		coda_write(dev, bitstream_size, CODA_CMD_ENC_HEADER_BB_SIZE);
		coda_write(dev, CODA_HEADER_H264_SPS, CODA_CMD_ENC_HEADER_CODE);
		if (coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER)) {
			v4l2_err(v4l2_dev, "CODA_COMMAND_ENCODE_HEADER timeout\n");
			return -ETIMEDOUT;
		}
		ctx->vpu_header_size[0] = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->idx)) -
				coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
		memcpy(&ctx->vpu_header[0][0], vb2_plane_vaddr(buf, 0),
		       ctx->vpu_header_size[0]);

		/*
		 * Get PPS in the first frame and copy it to an
		 * intermediate buffer.
		 */
		coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0), CODA_CMD_ENC_HEADER_BB_START);
		coda_write(dev, bitstream_size, CODA_CMD_ENC_HEADER_BB_SIZE);
		coda_write(dev, CODA_HEADER_H264_PPS, CODA_CMD_ENC_HEADER_CODE);
		if (coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER)) {
			v4l2_err(v4l2_dev, "CODA_COMMAND_ENCODE_HEADER timeout\n");
			return -ETIMEDOUT;
		}
		ctx->vpu_header_size[1] = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->idx)) -
				coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
		memcpy(&ctx->vpu_header[1][0], vb2_plane_vaddr(buf, 0),
		       ctx->vpu_header_size[1]);
		ctx->vpu_header_size[2] = 0;
		break;
	case V4L2_PIX_FMT_MPEG4:
		/*
		 * Get VOS in the first frame and copy it to an
		 * intermediate buffer
		 */
		coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0), CODA_CMD_ENC_HEADER_BB_START);
		coda_write(dev, bitstream_size, CODA_CMD_ENC_HEADER_BB_SIZE);
		coda_write(dev, CODA_HEADER_MP4V_VOS, CODA_CMD_ENC_HEADER_CODE);
		if (coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER)) {
			v4l2_err(v4l2_dev, "CODA_COMMAND_ENCODE_HEADER timeout\n");
			return -ETIMEDOUT;
		}
		ctx->vpu_header_size[0] = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->idx)) -
				coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
		memcpy(&ctx->vpu_header[0][0], vb2_plane_vaddr(buf, 0),
		       ctx->vpu_header_size[0]);

		coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0), CODA_CMD_ENC_HEADER_BB_START);
		coda_write(dev, bitstream_size, CODA_CMD_ENC_HEADER_BB_SIZE);
		coda_write(dev, CODA_HEADER_MP4V_VIS, CODA_CMD_ENC_HEADER_CODE);
		if (coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER)) {
			v4l2_err(v4l2_dev, "CODA_COMMAND_ENCODE_HEADER failed\n");
			return -ETIMEDOUT;
		}
		ctx->vpu_header_size[1] = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->idx)) -
				coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
		memcpy(&ctx->vpu_header[1][0], vb2_plane_vaddr(buf, 0),
		       ctx->vpu_header_size[1]);

		coda_write(dev, vb2_dma_contig_plane_dma_addr(buf, 0), CODA_CMD_ENC_HEADER_BB_START);
		coda_write(dev, bitstream_size, CODA_CMD_ENC_HEADER_BB_SIZE);
		coda_write(dev, CODA_HEADER_MP4V_VOL, CODA_CMD_ENC_HEADER_CODE);
		if (coda_command_sync(ctx, CODA_COMMAND_ENCODE_HEADER)) {
			v4l2_err(v4l2_dev, "CODA_COMMAND_ENCODE_HEADER failed\n");
			return -ETIMEDOUT;
		}
		ctx->vpu_header_size[2] = coda_read(dev, CODA_REG_BIT_WR_PTR(ctx->idx)) -
				coda_read(dev, CODA_CMD_ENC_HEADER_BB_START);
		memcpy(&ctx->vpu_header[2][0], vb2_plane_vaddr(buf, 0),
		       ctx->vpu_header_size[2]);
		break;
	default:
		/* No more formats need to save headers at the moment */
		break;
	}

	return 0;
}

static int coda_stop_streaming(struct vb2_queue *q)
{
	struct coda_ctx *ctx = vb2_get_drv_priv(q);

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

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

	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_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_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_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_MB, 0,
		V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_MB);
	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_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_MMAP;
	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;

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

	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	dst_vq->io_modes = VB2_MMAP;
	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;

	return vb2_queue_init(dst_vq);
}

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

	if (dev->instances >= CODA_MAX_INSTANCES)
		return -EBUSY;

	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;

	set_default_params(ctx);
	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx,
					 &coda_queue_init);
	if (IS_ERR(ctx->m2m_ctx)) {
		int 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;

	ctx->parabuf.vaddr = dma_alloc_coherent(&dev->plat_dev->dev,
			CODA_PARA_BUF_SIZE, &ctx->parabuf.paddr, GFP_KERNEL);
	if (!ctx->parabuf.vaddr) {
		v4l2_err(&dev->v4l2_dev, "failed to allocate parabuf");
		ret = -ENOMEM;
		goto err;
	}

	coda_lock(ctx);
	ctx->idx = 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);
	dev->instances--;
	coda_unlock(ctx);

	dma_free_coherent(&dev->plat_dev->dev, CODA_PARA_BUF_SIZE,
		ctx->parabuf.vaddr, ctx->parabuf.paddr);
	v4l2_m2m_ctx_release(ctx->m2m_ctx);
	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);
	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, *tmp_buf;
	struct coda_dev *dev = data;
	u32 wr_ptr, start_ptr;
	struct coda_ctx *ctx;

	/* 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");
		return IRQ_HANDLED;
	}

	if (ctx->aborting) {
		v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
			 "task has been aborted\n");
		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_next_src_buf(ctx->m2m_ctx);
	dst_buf = v4l2_m2m_next_dst_buf(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->idx));
	/* Calculate bytesused field */
	if (dst_buf->v4l2_buf.sequence == 0) {
		dst_buf->v4l2_planes[0].bytesused = (wr_ptr - start_ptr) +
						ctx->vpu_header_size[0] +
						ctx->vpu_header_size[1] +
						ctx->vpu_header_size[2];
	} else {
		dst_buf->v4l2_planes[0].bytesused = (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;
	}

	/* Free previous reference picture if available */
	if (ctx->reference) {
		v4l2_m2m_buf_done(ctx->reference, VB2_BUF_STATE_DONE);
		ctx->reference = NULL;
	}

	/*
	 * For the last frame of the gop we don't need to save
	 * a reference picture.
	 */
	v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
	tmp_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
	if (ctx->gopcounter == 0)
		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
	else
		ctx->reference = tmp_buf;

	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");

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

	return IRQ_HANDLED;
}

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

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";
	default:
		snprintf(buf, sizeof(buf), "(0x%04x)", product);
		return buf;
	}
}

static int coda_hw_init(struct coda_dev *dev, const struct firmware *fw)
{
	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 whole firmware image to the code buffer */
	memcpy(dev->codebuf.vaddr, fw->data, fw->size);
	/*
	 * Copy the first CODA_ISRAM_SIZE in the internal SRAM.
	 * This memory seems to be big-endian here, which is weird, since
	 * the internal ARM processor of the coda is little endian.
	 * Data in this SRAM survives a reboot.
	 */
	p = (u16 *)fw->data;
	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);
	}
	release_firmware(fw);

	/* Tell the BIT where to find everything it needs */
	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);
	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 */
	dev->codebuf.size = fw->size;
	dev->codebuf.vaddr = dma_alloc_coherent(&pdev->dev, fw->size,
						    &dev->codebuf.paddr,
						    GFP_KERNEL);
	if (!dev->codebuf.vaddr) {
		dev_err(&pdev->dev, "failed to allocate code buffer\n");
		return;
	}

	ret = coda_hw_init(dev, fw);
	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;
	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,
};

static const struct coda_devtype coda_devdata[] = {
	[CODA_IMX27] = {
		.firmware    = "v4l-codadx6-imx27.bin",
		.product     = CODA_DX6,
		.formats     = codadx6_formats,
		.num_formats = ARRAY_SIZE(codadx6_formats),
	},
};

static struct platform_device_id coda_platform_ids[] = {
	{ .name = "coda-imx27", .driver_data = CODA_IMX27 },
	{ /* 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] },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, coda_dt_ids);
#endif

static int __devinit 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_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);

	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;
	}

	if (devm_request_mem_region(&pdev->dev, res->start,
			resource_size(res), CODA_NAME) == NULL) {
		dev_err(&pdev->dev, "failed to request memory region\n");
		return -ENOENT;
	}
	dev->regs_base = devm_ioremap(&pdev->dev, res->start,
				      resource_size(res));
	if (!dev->regs_base) {
		dev_err(&pdev->dev, "failed to ioremap address region\n");
		return -ENOENT;
	}

	/* 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;
	}

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

	mutex_init(&dev->dev_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:
		dev->workbuf.size = CODADX6_WORK_BUF_SIZE;
		break;
	default:
		dev->workbuf.size = CODA7_WORK_BUF_SIZE;
	}
	dev->workbuf.vaddr = dma_alloc_coherent(&pdev->dev, dev->workbuf.size,
						    &dev->workbuf.paddr,
						    GFP_KERNEL);
	if (!dev->workbuf.vaddr) {
		dev_err(&pdev->dev, "failed to allocate work buffer\n");
		v4l2_device_unregister(&dev->v4l2_dev);
		return -ENOMEM;
	}

	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->codebuf.vaddr)
		dma_free_coherent(&pdev->dev, dev->codebuf.size,
				  &dev->codebuf.vaddr, dev->codebuf.paddr);
	if (dev->workbuf.vaddr)
		dma_free_coherent(&pdev->dev, dev->workbuf.size, &dev->workbuf.vaddr,
			  dev->workbuf.paddr);
	return 0;
}

static struct platform_driver coda_driver = {
	.probe	= coda_probe,
	.remove	= __devexit_p(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");