/*
 * Samsung TV Mixer driver
 *
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *
 * Tomasz Stanislawski, <t.stanislaws@samsung.com>
 *
 * 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 Foundiation. either version 2 of the License,
 * or (at your option) any later version
 */

#include "mixer.h"

#include "regs-vp.h"

#include <media/videobuf2-dma-contig.h>

/* FORMAT DEFINITIONS */
static const struct mxr_format mxr_fmt_nv12 = {
        .name = "NV12",
        .fourcc = V4L2_PIX_FMT_NV12,
        .colorspace = V4L2_COLORSPACE_JPEG,
        .num_planes = 2,
        .plane = {
                { .width = 1, .height = 1, .size = 1 },
                { .width = 2, .height = 2, .size = 2 },
        },
        .num_subframes = 1,
        .cookie = VP_MODE_NV12 | VP_MODE_MEM_LINEAR,
};

static const struct mxr_format mxr_fmt_nv21 = {
        .name = "NV21",
        .fourcc = V4L2_PIX_FMT_NV21,
        .colorspace = V4L2_COLORSPACE_JPEG,
        .num_planes = 2,
        .plane = {
                { .width = 1, .height = 1, .size = 1 },
                { .width = 2, .height = 2, .size = 2 },
        },
        .num_subframes = 1,
        .cookie = VP_MODE_NV21 | VP_MODE_MEM_LINEAR,
};

static const struct mxr_format mxr_fmt_nv12m = {
        .name = "NV12 (mplane)",
        .fourcc = V4L2_PIX_FMT_NV12M,
        .colorspace = V4L2_COLORSPACE_JPEG,
        .num_planes = 2,
        .plane = {
                { .width = 1, .height = 1, .size = 1 },
                { .width = 2, .height = 2, .size = 2 },
        },
        .num_subframes = 2,
        .plane2subframe = {0, 1},
        .cookie = VP_MODE_NV12 | VP_MODE_MEM_LINEAR,
};

static const struct mxr_format mxr_fmt_nv12mt = {
        .name = "NV12 tiled (mplane)",
        .fourcc = V4L2_PIX_FMT_NV12MT,
        .colorspace = V4L2_COLORSPACE_JPEG,
        .num_planes = 2,
        .plane = {
                { .width = 128, .height = 32, .size = 4096 },
                { .width = 128, .height = 32, .size = 2048 },
        },
        .num_subframes = 2,
        .plane2subframe = {0, 1},
        .cookie = VP_MODE_NV12 | VP_MODE_MEM_TILED,
};

static const struct mxr_format *mxr_video_format[] = {
        &mxr_fmt_nv12,
        &mxr_fmt_nv21,
        &mxr_fmt_nv12m,
        &mxr_fmt_nv12mt,
};

/* AUXILIARY CALLBACKS */

static void mxr_vp_layer_release(struct mxr_layer *layer)
{
        mxr_base_layer_unregister(layer);
        mxr_base_layer_release(layer);
}

static void mxr_vp_buffer_set(struct mxr_layer *layer,
        struct mxr_buffer *buf)
{
        dma_addr_t luma_addr[2] = {0, 0};
        dma_addr_t chroma_addr[2] = {0, 0};

        if (buf == NULL) {
                mxr_reg_vp_buffer(layer->mdev, luma_addr, chroma_addr);
                return;
        }
        luma_addr[0] = vb2_dma_contig_plane_dma_addr(&buf->vb, 0);
        if (layer->fmt->num_subframes == 2) {
                chroma_addr[0] = vb2_dma_contig_plane_dma_addr(&buf->vb, 1);
        } else {
                /* FIXME: mxr_get_plane_size compute integer division,
                 * which is slow and should not be performed in interrupt */
                chroma_addr[0] = luma_addr[0] + mxr_get_plane_size(
                        &layer->fmt->plane[0], layer->geo.src.full_width,
                        layer->geo.src.full_height);
        }
        if (layer->fmt->cookie & VP_MODE_MEM_TILED) {
                luma_addr[1] = luma_addr[0] + 0x40;
                chroma_addr[1] = chroma_addr[0] + 0x40;
        } else {
                luma_addr[1] = luma_addr[0] + layer->geo.src.full_width;
                chroma_addr[1] = chroma_addr[0];
        }
        mxr_reg_vp_buffer(layer->mdev, luma_addr, chroma_addr);
}

static void mxr_vp_stream_set(struct mxr_layer *layer, int en)
{
        mxr_reg_vp_layer_stream(layer->mdev, en);
}

static void mxr_vp_format_set(struct mxr_layer *layer)
{
        mxr_reg_vp_format(layer->mdev, layer->fmt, &layer->geo);
}

static inline unsigned int do_center(unsigned int center,
        unsigned int size, unsigned int upper, unsigned int flags)
{
        unsigned int lower;

        if (flags & MXR_NO_OFFSET)
                return 0;

        lower = center - min(center, size / 2);
        return min(lower, upper - size);
}

static void mxr_vp_fix_geometry(struct mxr_layer *layer,
        enum mxr_geometry_stage stage, unsigned long flags)
{
        struct mxr_geometry *geo = &layer->geo;
        struct mxr_crop *src = &geo->src;
        struct mxr_crop *dst = &geo->dst;
        unsigned long x_center, y_center;

        switch (stage) {

        case MXR_GEOMETRY_SINK: /* nothing to be fixed here */
        case MXR_GEOMETRY_COMPOSE:
                /* remember center of the area */
                x_center = dst->x_offset + dst->width / 2;
                y_center = dst->y_offset + dst->height / 2;

                /* ensure that compose is reachable using 16x scaling */
                dst->width = clamp(dst->width, 8U, 16 * src->full_width);
                dst->height = clamp(dst->height, 1U, 16 * src->full_height);

                /* setup offsets */
                dst->x_offset = do_center(x_center, dst->width,
                        dst->full_width, flags);
                dst->y_offset = do_center(y_center, dst->height,
                        dst->full_height, flags);
                flags = 0; /* remove possible MXR_NO_OFFSET flag */
                /* fall through */
        case MXR_GEOMETRY_CROP:
                /* remember center of the area */
                x_center = src->x_offset + src->width / 2;
                y_center = src->y_offset + src->height / 2;

                /* ensure scaling is between 0.25x .. 16x */
                src->width = clamp(src->width, round_up(dst->width / 16, 4),
                        dst->width * 4);
                src->height = clamp(src->height, round_up(dst->height / 16, 4),
                        dst->height * 4);

                /* hardware limits */
                src->width = clamp(src->width, 32U, 2047U);
                src->height = clamp(src->height, 4U, 2047U);

                /* setup offsets */
                src->x_offset = do_center(x_center, src->width,
                        src->full_width, flags);
                src->y_offset = do_center(y_center, src->height,
                        src->full_height, flags);

                /* setting scaling ratio */
                geo->x_ratio = (src->width << 16) / dst->width;
                geo->y_ratio = (src->height << 16) / dst->height;
                /* fall through */

        case MXR_GEOMETRY_SOURCE:
                src->full_width = clamp(src->full_width,
                        ALIGN(src->width + src->x_offset, 8), 8192U);
                src->full_height = clamp(src->full_height,
                        src->height + src->y_offset, 8192U);
        };
}

/* PUBLIC API */

struct mxr_layer *mxr_vp_layer_create(struct mxr_device *mdev, int idx)
{
        struct mxr_layer *layer;
        int ret;
        struct mxr_layer_ops ops = {
                .release = mxr_vp_layer_release,
                .buffer_set = mxr_vp_buffer_set,
                .stream_set = mxr_vp_stream_set,
                .format_set = mxr_vp_format_set,
                .fix_geometry = mxr_vp_fix_geometry,
        };
        char name[32];

        sprintf(name, "video%d", idx);

        layer = mxr_base_layer_create(mdev, idx, name, &ops);
        if (layer == NULL) {
                mxr_err(mdev, "failed to initialize layer(%d) base\n", idx);
                goto fail;
        }

        layer->fmt_array = mxr_video_format;
        layer->fmt_array_size = ARRAY_SIZE(mxr_video_format);

        ret = mxr_base_layer_register(layer);
        if (ret)
                goto fail_layer;

        return layer;

fail_layer:
        mxr_base_layer_release(layer);

fail:
        return NULL;
}