/*
 * s3c24xx/s3c64xx SoC series Camera Interface (CAMIF) driver
 *
 * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
 * Copyright (C) 2012 Tomasz Figa <tomasz.figa@gmail.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.
*/

#ifndef CAMIF_CORE_H_
#define CAMIF_CORE_H_

#include <linux/io.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/videodev2.h>

#include <media/media-entity.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mediabus.h>
#include <media/videobuf2-v4l2.h>
#include <media/drv-intf/s3c_camif.h>

#define S3C_CAMIF_DRIVER_NAME   "s3c-camif"
#define CAMIF_REQ_BUFS_MIN      3
#define CAMIF_MAX_OUT_BUFS      4
#define CAMIF_MAX_PIX_WIDTH     4096
#define CAMIF_MAX_PIX_HEIGHT    4096
#define SCALER_MAX_RATIO        64
#define CAMIF_DEF_WIDTH         640
#define CAMIF_DEF_HEIGHT        480
#define CAMIF_STOP_TIMEOUT      1500 /* ms */

#define S3C244X_CAMIF_IP_REV    0x20 /* 2.0 */
#define S3C2450_CAMIF_IP_REV    0x30 /* 3.0 - not implemented, not tested */
#define S3C6400_CAMIF_IP_REV    0x31 /* 3.1 - not implemented, not tested */
#define S3C6410_CAMIF_IP_REV    0x32 /* 3.2 */

/* struct camif_vp::state */

#define ST_VP_PENDING           (1 << 0)
#define ST_VP_RUNNING           (1 << 1)
#define ST_VP_STREAMING         (1 << 2)
#define ST_VP_SENSOR_STREAMING  (1 << 3)

#define ST_VP_ABORTING          (1 << 4)
#define ST_VP_OFF               (1 << 5)
#define ST_VP_LASTIRQ           (1 << 6)

#define ST_VP_CONFIG            (1 << 8)

#define CAMIF_SD_PAD_SINK       0
#define CAMIF_SD_PAD_SOURCE_C   1
#define CAMIF_SD_PAD_SOURCE_P   2
#define CAMIF_SD_PADS_NUM       3

enum img_fmt {
        IMG_FMT_RGB565 = 0x0010,
        IMG_FMT_RGB666,
        IMG_FMT_XRGB8888,
        IMG_FMT_YCBCR420 = 0x0020,
        IMG_FMT_YCRCB420,
        IMG_FMT_YCBCR422P,
        IMG_FMT_YCBYCR422 = 0x0040,
        IMG_FMT_YCRYCB422,
        IMG_FMT_CBYCRY422,
        IMG_FMT_CRYCBY422,
};

#define img_fmt_is_rgb(x) ((x) & 0x10)
#define img_fmt_is_ycbcr(x) ((x) & 0x60)

/* Possible values for struct camif_fmt::flags */
#define FMT_FL_S3C24XX_CODEC    (1 << 0)
#define FMT_FL_S3C24XX_PREVIEW  (1 << 1)
#define FMT_FL_S3C64XX          (1 << 2)

/**
 * struct camif_fmt - pixel format description
 * @fourcc:    fourcc code for this format, 0 if not applicable
 * @color:     a corresponding enum img_fmt
 * @colplanes: number of physically contiguous data planes
 * @flags:     indicate for which SoCs revisions this format is valid
 * @depth:     bits per pixel (total)
 * @ybpp:      number of luminance bytes per pixel
 */
struct camif_fmt {
        char *name;
        u32 fourcc;
        u32 color;
        u16 colplanes;
        u16 flags;
        u8 depth;
        u8 ybpp;
};

/**
 * struct camif_dma_offset - pixel offset information for DMA
 * @initial: offset (in pixels) to first pixel
 * @line: offset (in pixels) from end of line to start of next line
 */
struct camif_dma_offset {
        int     initial;
        int     line;
};

/**
 * struct camif_frame - source/target frame properties
 * @f_width: full pixel width
 * @f_height: full pixel height
 * @rect: crop/composition rectangle
 * @dma_offset: DMA offset configuration
 */
struct camif_frame {
        u16 f_width;
        u16 f_height;
        struct v4l2_rect rect;
        struct camif_dma_offset dma_offset;
};

/* CAMIF clocks enumeration */
enum {
        CLK_GATE,
        CLK_CAM,
        CLK_MAX_NUM,
};

struct vp_pix_limits {
        u16 max_out_width;
        u16 max_sc_out_width;
        u16 out_width_align;
        u16 max_height;
        u8 min_out_width;
        u16 out_hor_offset_align;
};

struct camif_pix_limits {
        u16 win_hor_offset_align;
};

/**
 * struct s3c_camif_variant - CAMIF variant structure
 * @vp_pix_limits:    pixel limits for the codec and preview paths
 * @camif_pix_limits: pixel limits for the camera input interface
 * @ip_revision:      the CAMIF IP revision: 0x20 for s3c244x, 0x32 for s3c6410
 */
struct s3c_camif_variant {
        struct vp_pix_limits vp_pix_limits[2];
        struct camif_pix_limits pix_limits;
        u8 ip_revision;
        u8 has_img_effect;
        unsigned int vp_offset;
};

struct s3c_camif_drvdata {
        const struct s3c_camif_variant *variant;
        unsigned long bus_clk_freq;
};

struct camif_scaler {
        u8 scaleup_h;
        u8 scaleup_v;
        u8 copy;
        u8 enable;
        u32 h_shift;
        u32 v_shift;
        u32 pre_h_ratio;
        u32 pre_v_ratio;
        u32 pre_dst_width;
        u32 pre_dst_height;
        u32 main_h_ratio;
        u32 main_v_ratio;
};

struct camif_dev;

/**
 * struct camif_vp - CAMIF data processing path structure (codec/preview)
 * @irq_queue:      interrupt handling waitqueue
 * @irq:            interrupt number for this data path
 * @camif:          pointer to the camif structure
 * @pad:            media pad for the video node
 * @vdev            video device
 * @ctrl_handler:   video node controls handler
 * @owner:          file handle that own the streaming
 * @pending_buf_q:  pending (empty) buffers queue head
 * @active_buf_q:   active (being written) buffers queue head
 * @active_buffers: counter of buffer set up at the DMA engine
 * @buf_index:      identifier of a last empty buffer set up in H/W
 * @frame_sequence: image frame sequence counter
 * @reqbufs_count:  the number of buffers requested
 * @scaler:         the scaler structure
 * @out_fmt:        pixel format at this video path output
 * @payload:        the output data frame payload size
 * @out_frame:      the output pixel resolution
 * @state:          the video path's state
 * @fmt_flags:      flags determining supported pixel formats
 * @id:             CAMIF id, 0 - codec, 1 - preview
 * @rotation:       current image rotation value
 * @hflip:          apply horizontal flip if set
 * @vflip:          apply vertical flip if set
 */
struct camif_vp {
        wait_queue_head_t       irq_queue;
        int                     irq;
        struct camif_dev        *camif;
        struct media_pad        pad;
        struct video_device     vdev;
        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_fh          *owner;
        struct vb2_queue        vb_queue;
        struct list_head        pending_buf_q;
        struct list_head        active_buf_q;
        unsigned int            active_buffers;
        unsigned int            buf_index;
        unsigned int            frame_sequence;
        unsigned int            reqbufs_count;
        struct camif_scaler     scaler;
        const struct camif_fmt  *out_fmt;
        unsigned int            payload;
        struct camif_frame      out_frame;
        unsigned int            state;
        u16                     fmt_flags;
        u8                      id;
        u16                     rotation;
        u8                      hflip;
        u8                      vflip;
        unsigned int            offset;
};

/* Video processing path enumeration */
#define VP_CODEC        0
#define VP_PREVIEW      1
#define CAMIF_VP_NUM    2

/**
 * struct camif_dev - the CAMIF driver private data structure
 * @media_dev:    top-level media device structure
 * @v4l2_dev:     root v4l2_device
 * @subdev:       camera interface ("catchcam") subdev
 * @mbus_fmt:     camera input media bus format
 * @camif_crop:   camera input interface crop rectangle
 * @pads:         the camif subdev's media pads
 * @stream_count: the camera interface streaming reference counter
 * @sensor:       image sensor data structure
 * @m_pipeline:   video entity pipeline description
 * @ctrl_handler: v4l2 control handler (owned by @subdev)
 * @test_pattern: test pattern controls
 * @vp:           video path (DMA) description (codec/preview)
 * @alloc_ctx:    memory buffer allocator context
 * @variant:      variant information for this device
 * @dev:          pointer to the CAMIF device struct
 * @pdata:        a copy of the driver's platform data
 * @clock:        clocks required for the CAMIF operation
 * @lock:         mutex protecting this data structure
 * @slock:        spinlock protecting CAMIF registers
 * @io_base:      start address of the mmaped CAMIF registers
 */
struct camif_dev {
        struct media_device             media_dev;
        struct v4l2_device              v4l2_dev;
        struct v4l2_subdev              subdev;
        struct v4l2_mbus_framefmt       mbus_fmt;
        struct v4l2_rect                camif_crop;
        struct media_pad                pads[CAMIF_SD_PADS_NUM];
        int                             stream_count;

        struct cam_sensor {
                struct v4l2_subdev      *sd;
                short                   power_count;
                short                   stream_count;
        } sensor;
        struct media_pipeline           *m_pipeline;

        struct v4l2_ctrl_handler        ctrl_handler;
        struct v4l2_ctrl                *ctrl_test_pattern;
        struct {
                struct v4l2_ctrl        *ctrl_colorfx;
                struct v4l2_ctrl        *ctrl_colorfx_cbcr;
        };
        u8                              test_pattern;
        u8                              colorfx;
        u8                              colorfx_cb;
        u8                              colorfx_cr;

        struct camif_vp                 vp[CAMIF_VP_NUM];
        struct vb2_alloc_ctx            *alloc_ctx;

        const struct s3c_camif_variant  *variant;
        struct device                   *dev;
        struct s3c_camif_plat_data      pdata;
        struct clk                      *clock[CLK_MAX_NUM];
        struct mutex                    lock;
        spinlock_t                      slock;
        void __iomem                    *io_base;
};

/**
 * struct camif_addr - Y/Cb/Cr DMA start address structure
 * @y:   luminance plane dma address
 * @cb:  Cb plane dma address
 * @cr:  Cr plane dma address
 */
struct camif_addr {
        dma_addr_t y;
        dma_addr_t cb;
        dma_addr_t cr;
};

/**
 * struct camif_buffer - the camif video buffer structure
 * @vb:    vb2 buffer
 * @list:  list head for the buffers queue
 * @paddr: DMA start addresses
 * @index: an identifier of this buffer at the DMA engine
 */
struct camif_buffer {
        struct vb2_v4l2_buffer vb;
        struct list_head list;
        struct camif_addr paddr;
        unsigned int index;
};

const struct camif_fmt *s3c_camif_find_format(struct camif_vp *vp,
              const u32 *pixelformat, int index);
int s3c_camif_register_video_node(struct camif_dev *camif, int idx);
void s3c_camif_unregister_video_node(struct camif_dev *camif, int idx);
irqreturn_t s3c_camif_irq_handler(int irq, void *priv);
int s3c_camif_create_subdev(struct camif_dev *camif);
void s3c_camif_unregister_subdev(struct camif_dev *camif);
int s3c_camif_set_defaults(struct camif_dev *camif);
int s3c_camif_get_scaler_config(struct camif_vp *vp,
                                struct camif_scaler *scaler);

static inline void camif_active_queue_add(struct camif_vp *vp,
                                          struct camif_buffer *buf)
{
        list_add_tail(&buf->list, &vp->active_buf_q);
        vp->active_buffers++;
}

static inline struct camif_buffer *camif_active_queue_pop(
                                        struct camif_vp *vp)
{
        struct camif_buffer *buf = list_first_entry(&vp->active_buf_q,
                                              struct camif_buffer, list);
        list_del(&buf->list);
        vp->active_buffers--;
        return buf;
}

static inline struct camif_buffer *camif_active_queue_peek(
                           struct camif_vp *vp, int index)
{
        struct camif_buffer *tmp, *buf;

        if (WARN_ON(list_empty(&vp->active_buf_q)))
                return NULL;

        list_for_each_entry_safe(buf, tmp, &vp->active_buf_q, list) {
                if (buf->index == index) {
                        list_del(&buf->list);
                        vp->active_buffers--;
                        return buf;
                }
        }

        return NULL;
}

static inline void camif_pending_queue_add(struct camif_vp *vp,
                                           struct camif_buffer *buf)
{
        list_add_tail(&buf->list, &vp->pending_buf_q);
}

static inline struct camif_buffer *camif_pending_queue_pop(
                                        struct camif_vp *vp)
{
        struct camif_buffer *buf = list_first_entry(&vp->pending_buf_q,
                                              struct camif_buffer, list);
        list_del(&buf->list);
        return buf;
}

#endif /* CAMIF_CORE_H_ */