/*
* Copyright (c) 2016 MediaTek Inc.
* Author: PC Chen <pc.chen@mediatek.com>
*         Tiffany Lin <tiffany.lin@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*/

#ifndef _MTK_VCODEC_DRV_H_
#define _MTK_VCODEC_DRV_H_

#include <linux/platform_device.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include "mtk_vcodec_util.h"

#define MTK_VCODEC_DRV_NAME	"mtk_vcodec_drv"
#define MTK_VCODEC_DEC_NAME	"mtk-vcodec-dec"
#define MTK_VCODEC_ENC_NAME	"mtk-vcodec-enc"
#define MTK_PLATFORM_STR	"platform:mt8173"

#define MTK_VCODEC_MAX_PLANES	3
#define MTK_V4L2_BENCHMARK	0
#define WAIT_INTR_TIMEOUT_MS	1000

/**
 * enum mtk_hw_reg_idx - MTK hw register base index
 */
enum mtk_hw_reg_idx {
	VDEC_SYS,
	VDEC_MISC,
	VDEC_LD,
	VDEC_TOP,
	VDEC_CM,
	VDEC_AD,
	VDEC_AV,
	VDEC_PP,
	VDEC_HWD,
	VDEC_HWQ,
	VDEC_HWB,
	VDEC_HWG,
	NUM_MAX_VDEC_REG_BASE,
	/* h264 encoder */
	VENC_SYS = NUM_MAX_VDEC_REG_BASE,
	/* vp8 encoder */
	VENC_LT_SYS,
	NUM_MAX_VCODEC_REG_BASE
};

/**
 * enum mtk_instance_type - The type of an MTK Vcodec instance.
 */
enum mtk_instance_type {
	MTK_INST_DECODER		= 0,
	MTK_INST_ENCODER		= 1,
};

/**
 * enum mtk_instance_state - The state of an MTK Vcodec instance.
 * @MTK_STATE_FREE - default state when instance is created
 * @MTK_STATE_INIT - vcodec instance is initialized
 * @MTK_STATE_HEADER - vdec had sps/pps header parsed or venc
 *			had sps/pps header encoded
 * @MTK_STATE_FLUSH - vdec is flushing. Only used by decoder
 * @MTK_STATE_ABORT - vcodec should be aborted
 */
enum mtk_instance_state {
	MTK_STATE_FREE = 0,
	MTK_STATE_INIT = 1,
	MTK_STATE_HEADER = 2,
	MTK_STATE_FLUSH = 3,
	MTK_STATE_ABORT = 4,
};

/**
 * struct mtk_encode_param - General encoding parameters type
 */
enum mtk_encode_param {
	MTK_ENCODE_PARAM_NONE = 0,
	MTK_ENCODE_PARAM_BITRATE = (1 << 0),
	MTK_ENCODE_PARAM_FRAMERATE = (1 << 1),
	MTK_ENCODE_PARAM_INTRA_PERIOD = (1 << 2),
	MTK_ENCODE_PARAM_FORCE_INTRA = (1 << 3),
	MTK_ENCODE_PARAM_GOP_SIZE = (1 << 4),
};

enum mtk_fmt_type {
	MTK_FMT_DEC = 0,
	MTK_FMT_ENC = 1,
	MTK_FMT_FRAME = 2,
};

/**
 * struct mtk_video_fmt - Structure used to store information about pixelformats
 */
struct mtk_video_fmt {
	u32	fourcc;
	enum mtk_fmt_type	type;
	u32	num_planes;
};

/**
 * struct mtk_codec_framesizes - Structure used to store information about
 *							framesizes
 */
struct mtk_codec_framesizes {
	u32	fourcc;
	struct	v4l2_frmsize_stepwise	stepwise;
};

/**
 * struct mtk_q_type - Type of queue
 */
enum mtk_q_type {
	MTK_Q_DATA_SRC = 0,
	MTK_Q_DATA_DST = 1,
};

/**
 * struct mtk_q_data - Structure used to store information about queue
 */
struct mtk_q_data {
	unsigned int	visible_width;
	unsigned int	visible_height;
	unsigned int	coded_width;
	unsigned int	coded_height;
	enum v4l2_field	field;
	unsigned int	bytesperline[MTK_VCODEC_MAX_PLANES];
	unsigned int	sizeimage[MTK_VCODEC_MAX_PLANES];
	struct mtk_video_fmt	*fmt;
};

/**
 * struct mtk_enc_params - General encoding parameters
 * @bitrate: target bitrate in bits per second
 * @num_b_frame: number of b frames between p-frame
 * @rc_frame: frame based rate control
 * @rc_mb: macroblock based rate control
 * @seq_hdr_mode: H.264 sequence header is encoded separately or joined
 *		  with the first frame
 * @intra_period: I frame period
 * @gop_size: group of picture size, it's used as the intra frame period
 * @framerate_num: frame rate numerator. ex: framerate_num=30 and
 *		   framerate_denom=1 menas FPS is 30
 * @framerate_denom: frame rate denominator. ex: framerate_num=30 and
 *		     framerate_denom=1 menas FPS is 30
 * @h264_max_qp: Max value for H.264 quantization parameter
 * @h264_profile: V4L2 defined H.264 profile
 * @h264_level: V4L2 defined H.264 level
 * @force_intra: force/insert intra frame
 */
struct mtk_enc_params {
	unsigned int	bitrate;
	unsigned int	num_b_frame;
	unsigned int	rc_frame;
	unsigned int	rc_mb;
	unsigned int	seq_hdr_mode;
	unsigned int	intra_period;
	unsigned int	gop_size;
	unsigned int	framerate_num;
	unsigned int	framerate_denom;
	unsigned int	h264_max_qp;
	unsigned int	h264_profile;
	unsigned int	h264_level;
	unsigned int	force_intra;
};

/**
 * struct mtk_vcodec_pm - Power management data structure
 */
struct mtk_vcodec_pm {
	struct clk	*vdec_bus_clk_src;
	struct clk	*vencpll;

	struct clk	*vcodecpll;
	struct clk	*univpll_d2;
	struct clk	*clk_cci400_sel;
	struct clk	*vdecpll;
	struct clk	*vdec_sel;
	struct clk	*vencpll_d2;
	struct clk	*venc_sel;
	struct clk	*univpll1_d2;
	struct clk	*venc_lt_sel;
	struct device	*larbvdec;
	struct device	*larbvenc;
	struct device	*larbvenclt;
	struct device	*dev;
	struct mtk_vcodec_dev	*mtkdev;
};

/**
 * struct vdec_pic_info  - picture size information
 * @pic_w: picture width
 * @pic_h: picture height
 * @buf_w: picture buffer width (64 aligned up from pic_w)
 * @buf_h: picture buffer heiht (64 aligned up from pic_h)
 * @y_bs_sz: Y bitstream size
 * @c_bs_sz: CbCr bitstream size
 * @y_len_sz: additional size required to store decompress information for y
 *		plane
 * @c_len_sz: additional size required to store decompress information for cbcr
 *		plane
 * E.g. suppose picture size is 176x144,
 *      buffer size will be aligned to 176x160.
 */
struct vdec_pic_info {
	unsigned int pic_w;
	unsigned int pic_h;
	unsigned int buf_w;
	unsigned int buf_h;
	unsigned int y_bs_sz;
	unsigned int c_bs_sz;
	unsigned int y_len_sz;
	unsigned int c_len_sz;
};

/**
 * struct mtk_vcodec_ctx - Context (instance) private data.
 *
 * @type: type of the instance - decoder or encoder
 * @dev: pointer to the mtk_vcodec_dev of the device
 * @list: link to ctx_list of mtk_vcodec_dev
 * @fh: struct v4l2_fh
 * @m2m_ctx: pointer to the v4l2_m2m_ctx of the context
 * @q_data: store information of input and output queue
 *	    of the context
 * @id: index of the context that this structure describes
 * @state: state of the context
 * @param_change: indicate encode parameter type
 * @enc_params: encoding parameters
 * @dec_if: hooked decoder driver interface
 * @enc_if: hoooked encoder driver interface
 * @drv_handle: driver handle for specific decode/encode instance
 *
 * @picinfo: store picture info after header parsing
 * @dpb_size: store dpb count after header parsing
 * @int_cond: variable used by the waitqueue
 * @int_type: type of the last interrupt
 * @queue: waitqueue that can be used to wait for this context to
 *	   finish
 * @irq_status: irq status
 *
 * @ctrl_hdl: handler for v4l2 framework
 * @decode_work: worker for the decoding
 * @encode_work: worker for the encoding
 * @last_decoded_picinfo: pic information get from latest decode
 * @empty_flush_buf: a fake size-0 capture buffer that indicates flush
 *
 * @colorspace: enum v4l2_colorspace; supplemental to pixelformat
 * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
 * @quantization: enum v4l2_quantization, colorspace quantization
 * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
 * @lock: protect variables accessed by V4L2 threads and worker thread such as
 *	  mtk_video_dec_buf.
 */
struct mtk_vcodec_ctx {
	enum mtk_instance_type type;
	struct mtk_vcodec_dev *dev;
	struct list_head list;

	struct v4l2_fh fh;
	struct v4l2_m2m_ctx *m2m_ctx;
	struct mtk_q_data q_data[2];
	int id;
	enum mtk_instance_state state;
	enum mtk_encode_param param_change;
	struct mtk_enc_params enc_params;

	const struct vdec_common_if *dec_if;
	const struct venc_common_if *enc_if;
	unsigned long drv_handle;

	struct vdec_pic_info picinfo;
	int dpb_size;

	int int_cond;
	int int_type;
	wait_queue_head_t queue;
	unsigned int irq_status;

	struct v4l2_ctrl_handler ctrl_hdl;
	struct work_struct decode_work;
	struct work_struct encode_work;
	struct vdec_pic_info last_decoded_picinfo;
	struct mtk_video_dec_buf *empty_flush_buf;

	enum v4l2_colorspace colorspace;
	enum v4l2_ycbcr_encoding ycbcr_enc;
	enum v4l2_quantization quantization;
	enum v4l2_xfer_func xfer_func;

	int decoded_frame_cnt;
	struct mutex lock;

};

/**
 * struct mtk_vcodec_dev - driver data
 * @v4l2_dev: V4L2 device to register video devices for.
 * @vfd_dec: Video device for decoder
 * @vfd_enc: Video device for encoder.
 *
 * @m2m_dev_dec: m2m device for decoder
 * @m2m_dev_enc: m2m device for encoder.
 * @plat_dev: platform device
 * @vpu_plat_dev: mtk vpu platform device
 * @ctx_list: list of struct mtk_vcodec_ctx
 * @irqlock: protect data access by irq handler and work thread
 * @curr_ctx: The context that is waiting for codec hardware
 *
 * @reg_base: Mapped address of MTK Vcodec registers.
 *
 * @id_counter: used to identify current opened instance
 *
 * @encode_workqueue: encode work queue
 *
 * @int_cond: used to identify interrupt condition happen
 * @int_type: used to identify what kind of interrupt condition happen
 * @dev_mutex: video_device lock
 * @queue: waitqueue for waiting for completion of device commands
 *
 * @dec_irq: decoder irq resource
 * @enc_irq: h264 encoder irq resource
 * @enc_lt_irq: vp8 encoder irq resource
 *
 * @dec_mutex: decoder hardware lock
 * @enc_mutex: encoder hardware lock.
 *
 * @pm: power management control
 * @dec_capability: used to identify decode capability, ex: 4k
 * @enc_capability: used to identify encode capability
 */
struct mtk_vcodec_dev {
	struct v4l2_device v4l2_dev;
	struct video_device *vfd_dec;
	struct video_device *vfd_enc;

	struct v4l2_m2m_dev *m2m_dev_dec;
	struct v4l2_m2m_dev *m2m_dev_enc;
	struct platform_device *plat_dev;
	struct platform_device *vpu_plat_dev;
	struct list_head ctx_list;
	spinlock_t irqlock;
	struct mtk_vcodec_ctx *curr_ctx;
	void __iomem *reg_base[NUM_MAX_VCODEC_REG_BASE];

	unsigned long id_counter;

	struct workqueue_struct *decode_workqueue;
	struct workqueue_struct *encode_workqueue;
	int int_cond;
	int int_type;
	struct mutex dev_mutex;
	wait_queue_head_t queue;

	int dec_irq;
	int enc_irq;
	int enc_lt_irq;

	struct mutex dec_mutex;
	struct mutex enc_mutex;

	struct mtk_vcodec_pm pm;
	unsigned int dec_capability;
	unsigned int enc_capability;
};

static inline struct mtk_vcodec_ctx *fh_to_ctx(struct v4l2_fh *fh)
{
	return container_of(fh, struct mtk_vcodec_ctx, fh);
}

static inline struct mtk_vcodec_ctx *ctrl_to_ctx(struct v4l2_ctrl *ctrl)
{
	return container_of(ctrl->handler, struct mtk_vcodec_ctx, ctrl_hdl);
}

#endif /* _MTK_VCODEC_DRV_H_ */
