/*
 * Copyright (C) 2010 - 2011 Samsung Electronics Co., Ltd.
 *
 * 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 FIMC_CORE_H_
#define FIMC_CORE_H_

/*#define DEBUG*/

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

#include <media/media-entity.h>
#include <media/videobuf2-core.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-mediabus.h>
#include <media/s5p_fimc.h>

#include "regs-fimc.h"

#define err(fmt, args...) \
        printk(KERN_ERR "%s:%d: " fmt "\n", __func__, __LINE__, ##args)

#define dbg(fmt, args...) \
        pr_debug("%s:%d: " fmt "\n", __func__, __LINE__, ##args)

/* Time to wait for next frame VSYNC interrupt while stopping operation. */
#define FIMC_SHUTDOWN_TIMEOUT   ((100*HZ)/1000)
#define MAX_FIMC_CLOCKS         2
#define FIMC_MODULE_NAME        "s5p-fimc"
#define FIMC_MAX_DEVS           4
#define FIMC_MAX_OUT_BUFS       4
#define SCALER_MAX_HRATIO       64
#define SCALER_MAX_VRATIO       64
#define DMA_MIN_SIZE            8
#define FIMC_CAMIF_MAX_HEIGHT   0x2000

/* indices to the clocks array */
enum {
        CLK_BUS,
        CLK_GATE,
};

enum fimc_dev_flags {
        ST_LPM,
        /* m2m node */
        ST_M2M_RUN,
        ST_M2M_PEND,
        ST_M2M_SUSPENDING,
        ST_M2M_SUSPENDED,
        /* capture node */
        ST_CAPT_PEND,
        ST_CAPT_RUN,
        ST_CAPT_STREAM,
        ST_CAPT_ISP_STREAM,
        ST_CAPT_SUSPENDED,
        ST_CAPT_SHUT,
        ST_CAPT_BUSY,
        ST_CAPT_APPLY_CFG,
        ST_CAPT_JPEG,
};

#define fimc_m2m_active(dev) test_bit(ST_M2M_RUN, &(dev)->state)
#define fimc_m2m_pending(dev) test_bit(ST_M2M_PEND, &(dev)->state)

#define fimc_capture_running(dev) test_bit(ST_CAPT_RUN, &(dev)->state)
#define fimc_capture_pending(dev) test_bit(ST_CAPT_PEND, &(dev)->state)
#define fimc_capture_busy(dev) test_bit(ST_CAPT_BUSY, &(dev)->state)

enum fimc_datapath {
        FIMC_CAMERA,
        FIMC_DMA,
        FIMC_LCDFIFO,
        FIMC_WRITEBACK
};

enum fimc_color_fmt {
        S5P_FIMC_RGB444 = 0x10,
        S5P_FIMC_RGB555,
        S5P_FIMC_RGB565,
        S5P_FIMC_RGB666,
        S5P_FIMC_RGB888,
        S5P_FIMC_RGB30_LOCAL,
        S5P_FIMC_YCBCR420 = 0x20,
        S5P_FIMC_YCBYCR422,
        S5P_FIMC_YCRYCB422,
        S5P_FIMC_CBYCRY422,
        S5P_FIMC_CRYCBY422,
        S5P_FIMC_YCBCR444_LOCAL,
        S5P_FIMC_JPEG = 0x40,
};

#define fimc_fmt_is_rgb(x) (!!((x) & 0x10))
#define fimc_fmt_is_jpeg(x) (!!((x) & 0x40))

#define IS_M2M(__strt) ((__strt) == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE || \
                        __strt == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)

/* Cb/Cr chrominance components order for 2 plane Y/CbCr 4:2:2 formats. */
#define S5P_FIMC_LSB_CRCB       S5P_CIOCTRL_ORDER422_2P_LSB_CRCB

/* The embedded image effect selection */
#define S5P_FIMC_EFFECT_ORIGINAL        S5P_CIIMGEFF_FIN_BYPASS
#define S5P_FIMC_EFFECT_ARBITRARY       S5P_CIIMGEFF_FIN_ARBITRARY
#define S5P_FIMC_EFFECT_NEGATIVE        S5P_CIIMGEFF_FIN_NEGATIVE
#define S5P_FIMC_EFFECT_ARTFREEZE       S5P_CIIMGEFF_FIN_ARTFREEZE
#define S5P_FIMC_EFFECT_EMBOSSING       S5P_CIIMGEFF_FIN_EMBOSSING
#define S5P_FIMC_EFFECT_SIKHOUETTE      S5P_CIIMGEFF_FIN_SILHOUETTE

/* The hardware context state. */
#define FIMC_PARAMS             (1 << 0)
#define FIMC_SRC_ADDR           (1 << 1)
#define FIMC_DST_ADDR           (1 << 2)
#define FIMC_SRC_FMT            (1 << 3)
#define FIMC_DST_FMT            (1 << 4)
#define FIMC_DST_CROP           (1 << 5)
#define FIMC_CTX_M2M            (1 << 16)
#define FIMC_CTX_CAP            (1 << 17)
#define FIMC_CTX_SHUT           (1 << 18)

/* Image conversion flags */
#define FIMC_IN_DMA_ACCESS_TILED        (1 << 0)
#define FIMC_IN_DMA_ACCESS_LINEAR       (0 << 0)
#define FIMC_OUT_DMA_ACCESS_TILED       (1 << 1)
#define FIMC_OUT_DMA_ACCESS_LINEAR      (0 << 1)
#define FIMC_SCAN_MODE_PROGRESSIVE      (0 << 2)
#define FIMC_SCAN_MODE_INTERLACED       (1 << 2)
/*
 * YCbCr data dynamic range for RGB-YUV color conversion.
 * Y/Cb/Cr: (0 ~ 255) */
#define FIMC_COLOR_RANGE_WIDE           (0 << 3)
/* Y (16 ~ 235), Cb/Cr (16 ~ 240) */
#define FIMC_COLOR_RANGE_NARROW         (1 << 3)

/**
 * struct fimc_fmt - the driver's internal color format data
 * @mbus_code: Media Bus pixel code, -1 if not applicable
 * @name: format description
 * @fourcc: the fourcc code for this format, 0 if not applicable
 * @color: the corresponding fimc_color_fmt
 * @memplanes: number of physically non-contiguous data planes
 * @colplanes: number of physically contiguous data planes
 * @depth: per plane driver's private 'number of bits per pixel'
 * @flags: flags indicating which operation mode format applies to
 */
struct fimc_fmt {
        enum v4l2_mbus_pixelcode mbus_code;
        char    *name;
        u32     fourcc;
        u32     color;
        u16     memplanes;
        u16     colplanes;
        u8      depth[VIDEO_MAX_PLANES];
        u16     flags;
#define FMT_FLAGS_CAM           (1 << 0)
#define FMT_FLAGS_M2M_IN        (1 << 1)
#define FMT_FLAGS_M2M_OUT       (1 << 2)
#define FMT_FLAGS_M2M           (1 << 1 | 1 << 2)
#define FMT_HAS_ALPHA           (1 << 3)
};

/**
 * struct fimc_dma_offset - pixel offset information for DMA
 * @y_h:        y value horizontal offset
 * @y_v:        y value vertical offset
 * @cb_h:       cb value horizontal offset
 * @cb_v:       cb value vertical offset
 * @cr_h:       cr value horizontal offset
 * @cr_v:       cr value vertical offset
 */
struct fimc_dma_offset {
        int     y_h;
        int     y_v;
        int     cb_h;
        int     cb_v;
        int     cr_h;
        int     cr_v;
};

/**
 * struct fimc_effect - color effect information
 * @type:       effect type
 * @pat_cb:     cr value when type is "arbitrary"
 * @pat_cr:     cr value when type is "arbitrary"
 */
struct fimc_effect {
        u32     type;
        u8      pat_cb;
        u8      pat_cr;
};

/**
 * struct fimc_scaler - the configuration data for FIMC inetrnal scaler
 * @scaleup_h:          flag indicating scaling up horizontally
 * @scaleup_v:          flag indicating scaling up vertically
 * @copy_mode:          flag indicating transparent DMA transfer (no scaling
 *                      and color format conversion)
 * @enabled:            flag indicating if the scaler is used
 * @hfactor:            horizontal shift factor
 * @vfactor:            vertical shift factor
 * @pre_hratio:         horizontal ratio of the prescaler
 * @pre_vratio:         vertical ratio of the prescaler
 * @pre_dst_width:      the prescaler's destination width
 * @pre_dst_height:     the prescaler's destination height
 * @main_hratio:        the main scaler's horizontal ratio
 * @main_vratio:        the main scaler's vertical ratio
 * @real_width:         source pixel (width - offset)
 * @real_height:        source pixel (height - offset)
 */
struct fimc_scaler {
        unsigned int scaleup_h:1;
        unsigned int scaleup_v:1;
        unsigned int copy_mode:1;
        unsigned int enabled:1;
        u32     hfactor;
        u32     vfactor;
        u32     pre_hratio;
        u32     pre_vratio;
        u32     pre_dst_width;
        u32     pre_dst_height;
        u32     main_hratio;
        u32     main_vratio;
        u32     real_width;
        u32     real_height;
};

/**
 * struct fimc_addr - the FIMC physical address set for DMA
 * @y:   luminance plane physical address
 * @cb:  Cb plane physical address
 * @cr:  Cr plane physical address
 */
struct fimc_addr {
        u32     y;
        u32     cb;
        u32     cr;
};

/**
 * struct fimc_vid_buffer - the driver's video buffer
 * @vb:    v4l videobuf buffer
 * @list:  linked list structure for buffer queue
 * @paddr: precalculated physical address set
 * @index: buffer index for the output DMA engine
 */
struct fimc_vid_buffer {
        struct vb2_buffer       vb;
        struct list_head        list;
        struct fimc_addr        paddr;
        int                     index;
};

/**
 * struct fimc_frame - source/target frame properties
 * @f_width:    image full width (virtual screen size)
 * @f_height:   image full height (virtual screen size)
 * @o_width:    original image width as set by S_FMT
 * @o_height:   original image height as set by S_FMT
 * @offs_h:     image horizontal pixel offset
 * @offs_v:     image vertical pixel offset
 * @width:      image pixel width
 * @height:     image pixel weight
 * @payload:    image size in bytes (w x h x bpp)
 * @paddr:      image frame buffer physical addresses
 * @dma_offset: DMA offset in bytes
 * @fmt:        fimc color format pointer
 */
struct fimc_frame {
        u32     f_width;
        u32     f_height;
        u32     o_width;
        u32     o_height;
        u32     offs_h;
        u32     offs_v;
        u32     width;
        u32     height;
        unsigned long           payload[VIDEO_MAX_PLANES];
        struct fimc_addr        paddr;
        struct fimc_dma_offset  dma_offset;
        struct fimc_fmt         *fmt;
        u8                      alpha;
};

/**
 * struct fimc_m2m_device - v4l2 memory-to-memory device data
 * @vfd: the video device node for v4l2 m2m mode
 * @m2m_dev: v4l2 memory-to-memory device data
 * @ctx: hardware context data
 * @refcnt: the reference counter
 */
struct fimc_m2m_device {
        struct video_device     *vfd;
        struct v4l2_m2m_dev     *m2m_dev;
        struct fimc_ctx         *ctx;
        int                     refcnt;
};

#define FIMC_SD_PAD_SINK        0
#define FIMC_SD_PAD_SOURCE      1
#define FIMC_SD_PADS_NUM        2

/**
 * struct fimc_vid_cap - camera capture device information
 * @ctx: hardware context data
 * @vfd: video device node for camera capture mode
 * @subdev: subdev exposing the FIMC processing block
 * @vd_pad: fimc video capture node pad
 * @sd_pads: fimc video processing block pads
 * @mf: media bus format at the FIMC camera input (and the scaler output) pad
 * @pending_buf_q: the pending buffer queue head
 * @active_buf_q: the queue head of buffers scheduled in hardware
 * @vbq: the capture am video buffer queue
 * @active_buf_cnt: number of video buffers scheduled in hardware
 * @buf_index: index for managing the output DMA buffers
 * @frame_count: the frame counter for statistics
 * @reqbufs_count: the number of buffers requested in REQBUFS ioctl
 * @input_index: input (camera sensor) index
 * @refcnt: driver's private reference counter
 * @input: capture input type, grp_id of the attached subdev
 * @user_subdev_api: true if subdevs are not configured by the host driver
 */
struct fimc_vid_cap {
        struct fimc_ctx                 *ctx;
        struct vb2_alloc_ctx            *alloc_ctx;
        struct video_device             *vfd;
        struct v4l2_subdev              *subdev;
        struct media_pad                vd_pad;
        struct v4l2_mbus_framefmt       mf;
        struct media_pad                sd_pads[FIMC_SD_PADS_NUM];
        struct list_head                pending_buf_q;
        struct list_head                active_buf_q;
        struct vb2_queue                vbq;
        int                             active_buf_cnt;
        int                             buf_index;
        unsigned int                    frame_count;
        unsigned int                    reqbufs_count;
        int                             input_index;
        int                             refcnt;
        u32                             input;
        bool                            user_subdev_api;
};

/**
 *  struct fimc_pix_limit - image pixel size limits in various IP configurations
 *
 *  @scaler_en_w: max input pixel width when the scaler is enabled
 *  @scaler_dis_w: max input pixel width when the scaler is disabled
 *  @in_rot_en_h: max input width with the input rotator is on
 *  @in_rot_dis_w: max input width with the input rotator is off
 *  @out_rot_en_w: max output width with the output rotator on
 *  @out_rot_dis_w: max output width with the output rotator off
 */
struct fimc_pix_limit {
        u16 scaler_en_w;
        u16 scaler_dis_w;
        u16 in_rot_en_h;
        u16 in_rot_dis_w;
        u16 out_rot_en_w;
        u16 out_rot_dis_w;
};

/**
 * struct samsung_fimc_variant - camera interface variant information
 *
 * @pix_hoff: indicate whether horizontal offset is in pixels or in bytes
 * @has_inp_rot: set if has input rotator
 * @has_out_rot: set if has output rotator
 * @has_cistatus2: 1 if CISTATUS2 register is present in this IP revision
 * @has_mainscaler_ext: 1 if extended mainscaler ratios in CIEXTEN register
 *                       are present in this IP revision
 * @has_cam_if: set if this instance has a camera input interface
 * @pix_limit: pixel size constraints for the scaler
 * @min_inp_pixsize: minimum input pixel size
 * @min_out_pixsize: minimum output pixel size
 * @hor_offs_align: horizontal pixel offset aligment
 * @min_vsize_align: minimum vertical pixel size alignment
 * @out_buf_count: the number of buffers in output DMA sequence
 */
struct samsung_fimc_variant {
        unsigned int    pix_hoff:1;
        unsigned int    has_inp_rot:1;
        unsigned int    has_out_rot:1;
        unsigned int    has_cistatus2:1;
        unsigned int    has_mainscaler_ext:1;
        unsigned int    has_cam_if:1;
        unsigned int    has_alpha:1;
        struct fimc_pix_limit *pix_limit;
        u16             min_inp_pixsize;
        u16             min_out_pixsize;
        u16             hor_offs_align;
        u16             min_vsize_align;
        u16             out_buf_count;
};

/**
 * struct samsung_fimc_driverdata - per device type driver data for init time.
 *
 * @variant: the variant information for this driver.
 * @dev_cnt: number of fimc sub-devices available in SoC
 * @lclk_frequency: fimc bus clock frequency
 */
struct samsung_fimc_driverdata {
        struct samsung_fimc_variant *variant[FIMC_MAX_DEVS];
        unsigned long   lclk_frequency;
        int             num_entities;
};

struct fimc_pipeline {
        struct media_pipeline *pipe;
        struct v4l2_subdev *sensor;
        struct v4l2_subdev *csis;
};

struct fimc_ctx;

/**
 * struct fimc_dev - abstraction for FIMC entity
 * @slock:      the spinlock protecting this data structure
 * @lock:       the mutex protecting this data structure
 * @pdev:       pointer to the FIMC platform device
 * @pdata:      pointer to the device platform data
 * @variant:    the IP variant information
 * @id:         FIMC device index (0..FIMC_MAX_DEVS)
 * @num_clocks: the number of clocks managed by this device instance
 * @clock:      clocks required for FIMC operation
 * @regs:       the mapped hardware registers
 * @regs_res:   the resource claimed for IO registers
 * @irq:        FIMC interrupt number
 * @irq_queue:  interrupt handler waitqueue
 * @v4l2_dev:   root v4l2_device
 * @m2m:        memory-to-memory V4L2 device information
 * @vid_cap:    camera capture device information
 * @state:      flags used to synchronize m2m and capture mode operation
 * @alloc_ctx:  videobuf2 memory allocator context
 * @pipeline:   fimc video capture pipeline data structure
 */
struct fimc_dev {
        spinlock_t                      slock;
        struct mutex                    lock;
        struct platform_device          *pdev;
        struct s5p_platform_fimc        *pdata;
        struct samsung_fimc_variant     *variant;
        u16                             id;
        u16                             num_clocks;
        struct clk                      *clock[MAX_FIMC_CLOCKS];
        void __iomem                    *regs;
        struct resource                 *regs_res;
        int                             irq;
        wait_queue_head_t               irq_queue;
        struct v4l2_device              *v4l2_dev;
        struct fimc_m2m_device          m2m;
        struct fimc_vid_cap             vid_cap;
        unsigned long                   state;
        struct vb2_alloc_ctx            *alloc_ctx;
        struct fimc_pipeline            pipeline;
};

/**
 * fimc_ctx - the device context data
 * @slock:              spinlock protecting this data structure
 * @s_frame:            source frame properties
 * @d_frame:            destination frame properties
 * @out_order_1p:       output 1-plane YCBCR order
 * @out_order_2p:       output 2-plane YCBCR order
 * @in_order_1p         input 1-plane YCBCR order
 * @in_order_2p:        input 2-plane YCBCR order
 * @in_path:            input mode (DMA or camera)
 * @out_path:           output mode (DMA or FIFO)
 * @scaler:             image scaler properties
 * @effect:             image effect
 * @rotation:           image clockwise rotation in degrees
 * @hflip:              indicates image horizontal flip if set
 * @vflip:              indicates image vertical flip if set
 * @flags:              additional flags for image conversion
 * @state:              flags to keep track of user configuration
 * @fimc_dev:           the FIMC device this context applies to
 * @m2m_ctx:            memory-to-memory device context
 * @fh:                 v4l2 file handle
 * @ctrl_handler:       v4l2 controls handler
 * @ctrl_rotate         image rotation control
 * @ctrl_hflip          horizontal flip control
 * @ctrl_vflip          vertical flip control
 * @ctrl_alpha          RGB alpha control
 * @ctrls_rdy:          true if the control handler is initialized
 */
struct fimc_ctx {
        spinlock_t              slock;
        struct fimc_frame       s_frame;
        struct fimc_frame       d_frame;
        u32                     out_order_1p;
        u32                     out_order_2p;
        u32                     in_order_1p;
        u32                     in_order_2p;
        enum fimc_datapath      in_path;
        enum fimc_datapath      out_path;
        struct fimc_scaler      scaler;
        struct fimc_effect      effect;
        int                     rotation;
        unsigned int            hflip:1;
        unsigned int            vflip:1;
        u32                     flags;
        u32                     state;
        struct fimc_dev         *fimc_dev;
        struct v4l2_m2m_ctx     *m2m_ctx;
        struct v4l2_fh          fh;
        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_ctrl        *ctrl_rotate;
        struct v4l2_ctrl        *ctrl_hflip;
        struct v4l2_ctrl        *ctrl_vflip;
        struct v4l2_ctrl        *ctrl_alpha;
        bool                    ctrls_rdy;
};

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

static inline void set_frame_bounds(struct fimc_frame *f, u32 width, u32 height)
{
        f->o_width  = width;
        f->o_height = height;
        f->f_width  = width;
        f->f_height = height;
}

static inline void set_frame_crop(struct fimc_frame *f,
                                  u32 left, u32 top, u32 width, u32 height)
{
        f->offs_h = left;
        f->offs_v = top;
        f->width  = width;
        f->height = height;
}

static inline u32 fimc_get_format_depth(struct fimc_fmt *ff)
{
        u32 i, depth = 0;

        if (ff != NULL)
                for (i = 0; i < ff->colplanes; i++)
                        depth += ff->depth[i];
        return depth;
}

static inline bool fimc_capture_active(struct fimc_dev *fimc)
{
        unsigned long flags;
        bool ret;

        spin_lock_irqsave(&fimc->slock, flags);
        ret = !!(fimc->state & (1 << ST_CAPT_RUN) ||
                 fimc->state & (1 << ST_CAPT_PEND));
        spin_unlock_irqrestore(&fimc->slock, flags);
        return ret;
}

static inline void fimc_ctx_state_lock_set(u32 state, struct fimc_ctx *ctx)
{
        unsigned long flags;

        spin_lock_irqsave(&ctx->slock, flags);
        ctx->state |= state;
        spin_unlock_irqrestore(&ctx->slock, flags);
}

static inline bool fimc_ctx_state_is_set(u32 mask, struct fimc_ctx *ctx)
{
        unsigned long flags;
        bool ret;

        spin_lock_irqsave(&ctx->slock, flags);
        ret = (ctx->state & mask) == mask;
        spin_unlock_irqrestore(&ctx->slock, flags);
        return ret;
}

static inline int tiled_fmt(struct fimc_fmt *fmt)
{
        return fmt->fourcc == V4L2_PIX_FMT_NV12MT;
}

/* Return the alpha component bit mask */
static inline int fimc_get_alpha_mask(struct fimc_fmt *fmt)
{
        switch (fmt->color) {
        case S5P_FIMC_RGB444:   return 0x0f;
        case S5P_FIMC_RGB555:   return 0x01;
        case S5P_FIMC_RGB888:   return 0xff;
        default:                return 0;
        };
}

static inline void fimc_hw_clear_irq(struct fimc_dev *dev)
{
        u32 cfg = readl(dev->regs + S5P_CIGCTRL);
        cfg |= S5P_CIGCTRL_IRQ_CLR;
        writel(cfg, dev->regs + S5P_CIGCTRL);
}

static inline void fimc_hw_enable_scaler(struct fimc_dev *dev, bool on)
{
        u32 cfg = readl(dev->regs + S5P_CISCCTRL);
        if (on)
                cfg |= S5P_CISCCTRL_SCALERSTART;
        else
                cfg &= ~S5P_CISCCTRL_SCALERSTART;
        writel(cfg, dev->regs + S5P_CISCCTRL);
}

static inline void fimc_hw_activate_input_dma(struct fimc_dev *dev, bool on)
{
        u32 cfg = readl(dev->regs + S5P_MSCTRL);
        if (on)
                cfg |= S5P_MSCTRL_ENVID;
        else
                cfg &= ~S5P_MSCTRL_ENVID;
        writel(cfg, dev->regs + S5P_MSCTRL);
}

static inline void fimc_hw_dis_capture(struct fimc_dev *dev)
{
        u32 cfg = readl(dev->regs + S5P_CIIMGCPT);
        cfg &= ~(S5P_CIIMGCPT_IMGCPTEN | S5P_CIIMGCPT_IMGCPTEN_SC);
        writel(cfg, dev->regs + S5P_CIIMGCPT);
}

/**
 * fimc_hw_set_dma_seq - configure output DMA buffer sequence
 * @mask: each bit corresponds to one of 32 output buffer registers set
 *        1 to include buffer in the sequence, 0 to disable
 *
 * This function mask output DMA ring buffers, i.e. it allows to configure
 * which of the output buffer address registers will be used by the DMA
 * engine.
 */
static inline void fimc_hw_set_dma_seq(struct fimc_dev *dev, u32 mask)
{
        writel(mask, dev->regs + S5P_CIFCNTSEQ);
}

static inline struct fimc_frame *ctx_get_frame(struct fimc_ctx *ctx,
                                               enum v4l2_buf_type type)
{
        struct fimc_frame *frame;

        if (V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE == type) {
                if (fimc_ctx_state_is_set(FIMC_CTX_M2M, ctx))
                        frame = &ctx->s_frame;
                else
                        return ERR_PTR(-EINVAL);
        } else if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == type) {
                frame = &ctx->d_frame;
        } else {
                v4l2_err(ctx->fimc_dev->v4l2_dev,
                        "Wrong buffer/video queue type (%d)\n", type);
                return ERR_PTR(-EINVAL);
        }

        return frame;
}

/* Return an index to the buffer actually being written. */
static inline u32 fimc_hw_get_frame_index(struct fimc_dev *dev)
{
        u32 reg;

        if (dev->variant->has_cistatus2) {
                reg = readl(dev->regs + S5P_CISTATUS2) & 0x3F;
                return reg > 0 ? --reg : reg;
        } else {
                reg = readl(dev->regs + S5P_CISTATUS);
                return (reg & S5P_CISTATUS_FRAMECNT_MASK) >>
                        S5P_CISTATUS_FRAMECNT_SHIFT;
        }
}

/* -----------------------------------------------------*/
/* fimc-reg.c                                           */
void fimc_hw_reset(struct fimc_dev *fimc);
void fimc_hw_set_rotation(struct fimc_ctx *ctx);
void fimc_hw_set_target_format(struct fimc_ctx *ctx);
void fimc_hw_set_out_dma(struct fimc_ctx *ctx);
void fimc_hw_en_lastirq(struct fimc_dev *fimc, int enable);
void fimc_hw_en_irq(struct fimc_dev *fimc, int enable);
void fimc_hw_set_prescaler(struct fimc_ctx *ctx);
void fimc_hw_set_mainscaler(struct fimc_ctx *ctx);
void fimc_hw_en_capture(struct fimc_ctx *ctx);
void fimc_hw_set_effect(struct fimc_ctx *ctx, bool active);
void fimc_hw_set_rgb_alpha(struct fimc_ctx *ctx);
void fimc_hw_set_in_dma(struct fimc_ctx *ctx);
void fimc_hw_set_input_path(struct fimc_ctx *ctx);
void fimc_hw_set_output_path(struct fimc_ctx *ctx);
void fimc_hw_set_input_addr(struct fimc_dev *fimc, struct fimc_addr *paddr);
void fimc_hw_set_output_addr(struct fimc_dev *fimc, struct fimc_addr *paddr,
                             int index);
int fimc_hw_set_camera_source(struct fimc_dev *fimc,
                              struct s5p_fimc_isp_info *cam);
int fimc_hw_set_camera_offset(struct fimc_dev *fimc, struct fimc_frame *f);
int fimc_hw_set_camera_polarity(struct fimc_dev *fimc,
                                struct s5p_fimc_isp_info *cam);
int fimc_hw_set_camera_type(struct fimc_dev *fimc,
                            struct s5p_fimc_isp_info *cam);

/* -----------------------------------------------------*/
/* fimc-core.c */
int fimc_vidioc_enum_fmt_mplane(struct file *file, void *priv,
                                struct v4l2_fmtdesc *f);
int fimc_ctrls_create(struct fimc_ctx *ctx);
void fimc_ctrls_delete(struct fimc_ctx *ctx);
void fimc_ctrls_activate(struct fimc_ctx *ctx, bool active);
void fimc_alpha_ctrl_update(struct fimc_ctx *ctx);
int fimc_fill_format(struct fimc_frame *frame, struct v4l2_format *f);
void fimc_adjust_mplane_format(struct fimc_fmt *fmt, u32 width, u32 height,
                               struct v4l2_pix_format_mplane *pix);
struct fimc_fmt *fimc_find_format(u32 *pixelformat, u32 *mbus_code,
                                  unsigned int mask, int index);

int fimc_check_scaler_ratio(struct fimc_ctx *ctx, int sw, int sh,
                            int dw, int dh, int rotation);
int fimc_set_scaler_info(struct fimc_ctx *ctx);
int fimc_prepare_config(struct fimc_ctx *ctx, u32 flags);
int fimc_prepare_addr(struct fimc_ctx *ctx, struct vb2_buffer *vb,
                      struct fimc_frame *frame, struct fimc_addr *paddr);
void fimc_prepare_dma_offset(struct fimc_ctx *ctx, struct fimc_frame *f);
void fimc_set_yuv_order(struct fimc_ctx *ctx);
void fimc_fill_frame(struct fimc_frame *frame, struct v4l2_format *f);
void fimc_capture_irq_handler(struct fimc_dev *fimc, bool done);

int fimc_register_m2m_device(struct fimc_dev *fimc,
                             struct v4l2_device *v4l2_dev);
void fimc_unregister_m2m_device(struct fimc_dev *fimc);
int fimc_register_driver(void);
void fimc_unregister_driver(void);

/* -----------------------------------------------------*/
/* fimc-capture.c                                       */
int fimc_register_capture_device(struct fimc_dev *fimc,
                                 struct v4l2_device *v4l2_dev);
void fimc_unregister_capture_device(struct fimc_dev *fimc);
int fimc_capture_ctrls_create(struct fimc_dev *fimc);
int fimc_vid_cap_buf_queue(struct fimc_dev *fimc,
                             struct fimc_vid_buffer *fimc_vb);
void fimc_sensor_notify(struct v4l2_subdev *sd, unsigned int notification,
                        void *arg);
int fimc_capture_suspend(struct fimc_dev *fimc);
int fimc_capture_resume(struct fimc_dev *fimc);
int fimc_capture_config_update(struct fimc_ctx *ctx);

/* Locking: the caller holds fimc->slock */
static inline void fimc_activate_capture(struct fimc_ctx *ctx)
{
        fimc_hw_enable_scaler(ctx->fimc_dev, ctx->scaler.enabled);
        fimc_hw_en_capture(ctx);
}

static inline void fimc_deactivate_capture(struct fimc_dev *fimc)
{
        fimc_hw_en_lastirq(fimc, true);
        fimc_hw_dis_capture(fimc);
        fimc_hw_enable_scaler(fimc, false);
        fimc_hw_en_lastirq(fimc, false);
}

/*
 * Buffer list manipulation functions. Must be called with fimc.slock held.
 */

/**
 * fimc_active_queue_add - add buffer to the capture active buffers queue
 * @buf: buffer to add to the active buffers list
 */
static inline void fimc_active_queue_add(struct fimc_vid_cap *vid_cap,
                                         struct fimc_vid_buffer *buf)
{
        list_add_tail(&buf->list, &vid_cap->active_buf_q);
        vid_cap->active_buf_cnt++;
}

/**
 * fimc_active_queue_pop - pop buffer from the capture active buffers queue
 *
 * The caller must assure the active_buf_q list is not empty.
 */
static inline struct fimc_vid_buffer *fimc_active_queue_pop(
                                    struct fimc_vid_cap *vid_cap)
{
        struct fimc_vid_buffer *buf;
        buf = list_entry(vid_cap->active_buf_q.next,
                         struct fimc_vid_buffer, list);
        list_del(&buf->list);
        vid_cap->active_buf_cnt--;
        return buf;
}

/**
 * fimc_pending_queue_add - add buffer to the capture pending buffers queue
 * @buf: buffer to add to the pending buffers list
 */
static inline void fimc_pending_queue_add(struct fimc_vid_cap *vid_cap,
                                          struct fimc_vid_buffer *buf)
{
        list_add_tail(&buf->list, &vid_cap->pending_buf_q);
}

/**
 * fimc_pending_queue_pop - pop buffer from the capture pending buffers queue
 *
 * The caller must assure the pending_buf_q list is not empty.
 */
static inline struct fimc_vid_buffer *fimc_pending_queue_pop(
                                     struct fimc_vid_cap *vid_cap)
{
        struct fimc_vid_buffer *buf;
        buf = list_entry(vid_cap->pending_buf_q.next,
                        struct fimc_vid_buffer, list);
        list_del(&buf->list);
        return buf;
}

#endif /* FIMC_CORE_H_ */