/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * ispvideo.h
 *
 * TI OMAP3 ISP - Generic video node
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *           Sakari Ailus <sakari.ailus@iki.fi>
 */

#ifndef OMAP3_ISP_VIDEO_H
#define OMAP3_ISP_VIDEO_H

#include <linux/v4l2-mediabus.h>
#include <media/media-entity.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/videobuf2-v4l2.h>

#define ISP_VIDEO_DRIVER_NAME           "ispvideo"
#define ISP_VIDEO_DRIVER_VERSION        "0.0.2"

struct isp_device;
struct isp_video;
struct v4l2_mbus_framefmt;
struct v4l2_pix_format;

/*
 * struct isp_format_info - ISP media bus format information
 * @code: V4L2 media bus format code
 * @truncated: V4L2 media bus format code for the same format truncated to 10
 *      bits. Identical to @code if the format is 10 bits wide or less.
 * @uncompressed: V4L2 media bus format code for the corresponding uncompressed
 *      format. Identical to @code if the format is not DPCM compressed.
 * @flavor: V4L2 media bus format code for the same pixel layout but
 *      shifted to be 8 bits per pixel. =0 if format is not shiftable.
 * @pixelformat: V4L2 pixel format FCC identifier
 * @width: Bits per pixel (when transferred over a bus)
 * @bpp: Bytes per pixel (when stored in memory)
 */
struct isp_format_info {
        u32 code;
        u32 truncated;
        u32 uncompressed;
        u32 flavor;
        u32 pixelformat;
        unsigned int width;
        unsigned int bpp;
};

enum isp_pipeline_stream_state {
        ISP_PIPELINE_STREAM_STOPPED = 0,
        ISP_PIPELINE_STREAM_CONTINUOUS = 1,
        ISP_PIPELINE_STREAM_SINGLESHOT = 2,
};

enum isp_pipeline_state {
        /* The stream has been started on the input video node. */
        ISP_PIPELINE_STREAM_INPUT = 1,
        /* The stream has been started on the output video node. */
        ISP_PIPELINE_STREAM_OUTPUT = 2,
        /* At least one buffer is queued on the input video node. */
        ISP_PIPELINE_QUEUE_INPUT = 4,
        /* At least one buffer is queued on the output video node. */
        ISP_PIPELINE_QUEUE_OUTPUT = 8,
        /* The input entity is idle, ready to be started. */
        ISP_PIPELINE_IDLE_INPUT = 16,
        /* The output entity is idle, ready to be started. */
        ISP_PIPELINE_IDLE_OUTPUT = 32,
        /* The pipeline is currently streaming. */
        ISP_PIPELINE_STREAM = 64,
};

/*
 * struct isp_pipeline - An ISP hardware pipeline
 * @field: The field being processed by the pipeline
 * @error: A hardware error occurred during capture
 * @ent_enum: Entities in the pipeline
 */
struct isp_pipeline {
        struct media_pipeline pipe;
        spinlock_t lock;                /* Pipeline state and queue flags */
        unsigned int state;
        enum isp_pipeline_stream_state stream_state;
        struct isp_video *input;
        struct isp_video *output;
        struct media_entity_enum ent_enum;
        unsigned long l3_ick;
        unsigned int max_rate;
        enum v4l2_field field;
        atomic_t frame_number;
        bool do_propagation; /* of frame number */
        bool error;
        struct v4l2_fract max_timeperframe;
        struct v4l2_subdev *external;
        unsigned int external_rate;
        unsigned int external_width;
};

static inline struct isp_pipeline *to_isp_pipeline(struct media_entity *entity)
{
        struct media_pipeline *pipe = media_entity_pipeline(entity);

        if (!pipe)
                return NULL;

        return container_of(pipe, struct isp_pipeline, pipe);
}

static inline int isp_pipeline_ready(struct isp_pipeline *pipe)
{
        return pipe->state == (ISP_PIPELINE_STREAM_INPUT |
                               ISP_PIPELINE_STREAM_OUTPUT |
                               ISP_PIPELINE_QUEUE_INPUT |
                               ISP_PIPELINE_QUEUE_OUTPUT |
                               ISP_PIPELINE_IDLE_INPUT |
                               ISP_PIPELINE_IDLE_OUTPUT);
}

/**
 * struct isp_buffer - ISP video buffer
 * @vb: videobuf2 buffer
 * @irqlist: List head for insertion into IRQ queue
 * @dma: DMA address
 */
struct isp_buffer {
        struct vb2_v4l2_buffer vb;
        struct list_head irqlist;
        dma_addr_t dma;
};

#define to_isp_buffer(buf)      container_of(buf, struct isp_buffer, vb)

enum isp_video_dmaqueue_flags {
        /* Set if DMA queue becomes empty when ISP_PIPELINE_STREAM_CONTINUOUS */
        ISP_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),
        /* Set when queuing buffer to an empty DMA queue */
        ISP_VIDEO_DMAQUEUE_QUEUED = (1 << 1),
};

#define isp_video_dmaqueue_flags_clr(video)     \
                        ({ (video)->dmaqueue_flags = 0; })

/*
 * struct isp_video_operations - ISP video operations
 * @queue:      Resume streaming when a buffer is queued. Called on VIDIOC_QBUF
 *              if there was no buffer previously queued.
 */
struct isp_video_operations {
        int(*queue)(struct isp_video *video, struct isp_buffer *buffer);
};

struct isp_video {
        struct video_device video;
        enum v4l2_buf_type type;
        struct media_pad pad;

        struct mutex mutex;             /* format and crop settings */
        atomic_t active;

        struct isp_device *isp;

        unsigned int capture_mem;
        unsigned int bpl_alignment;     /* alignment value */
        unsigned int bpl_zero_padding;  /* whether the alignment is optional */
        unsigned int bpl_max;           /* maximum bytes per line value */
        unsigned int bpl_value;         /* bytes per line value */
        unsigned int bpl_padding;       /* padding at end of line */

        /* Pipeline state */
        struct isp_pipeline pipe;
        struct mutex stream_lock;       /* pipeline and stream states */
        bool error;

        /* Video buffers queue */
        struct vb2_queue *queue;
        struct mutex queue_lock;        /* protects the queue */
        spinlock_t irqlock;             /* protects dmaqueue */
        struct list_head dmaqueue;
        enum isp_video_dmaqueue_flags dmaqueue_flags;

        const struct isp_video_operations *ops;
};

#define to_isp_video(vdev)      container_of(vdev, struct isp_video, video)

struct isp_video_fh {
        struct v4l2_fh vfh;
        struct isp_video *video;
        struct vb2_queue queue;
        struct v4l2_format format;
        struct v4l2_fract timeperframe;
};

static inline struct isp_video_fh *file_to_isp_video_fh(struct file *filp)
{
        return container_of(file_to_v4l2_fh(filp), struct isp_video_fh, vfh);
}

#define isp_video_queue_to_isp_video_fh(q) \
                                container_of(q, struct isp_video_fh, queue)

int omap3isp_video_init(struct isp_video *video, const char *name);
void omap3isp_video_cleanup(struct isp_video *video);
int omap3isp_video_register(struct isp_video *video,
                            struct v4l2_device *vdev);
void omap3isp_video_unregister(struct isp_video *video);
struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video);
void omap3isp_video_cancel_stream(struct isp_video *video);
void omap3isp_video_resume(struct isp_video *video, int continuous);
struct media_pad *omap3isp_video_remote_pad(struct isp_video *video);

const struct isp_format_info *
omap3isp_video_format_info(u32 code);

#endif /* OMAP3_ISP_VIDEO_H */