/*
 * drivers/gpu/drm/omapdrm/omap_fb.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <rob@ti.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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/seq_file.h>

#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>

#include "omap_dmm_tiler.h"
#include "omap_drv.h"

/*
 * framebuffer funcs
 */

/* per-format info: */
struct format {
        enum omap_color_mode dss_format;
        uint32_t pixel_format;
        struct {
                int stride_bpp;           /* this times width is stride */
                int sub_y;                /* sub-sample in y dimension */
        } planes[4];
        bool yuv;
};

static const struct format formats[] = {
        /* 16bpp [A]RGB: */
        { OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
        { OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
        { OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
        { OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
        { OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
        { OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
        { OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
        /* 24bpp RGB: */
        { OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
        /* 32bpp [A]RGB: */
        { OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
        { OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
        { OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
        { OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
        /* YUV: */
        { OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
        { OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
        { OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
};

/* convert from overlay's pixel formats bitmask to an array of fourcc's */
uint32_t omap_framebuffer_get_formats(uint32_t *pixel_formats,
                uint32_t max_formats, enum omap_color_mode supported_modes)
{
        uint32_t nformats = 0;
        int i = 0;

        for (i = 0; i < ARRAY_SIZE(formats) && nformats < max_formats; i++)
                if (formats[i].dss_format & supported_modes)
                        pixel_formats[nformats++] = formats[i].pixel_format;

        return nformats;
}

/* per-plane info for the fb: */
struct plane {
        struct drm_gem_object *bo;
        uint32_t pitch;
        uint32_t offset;
        dma_addr_t paddr;
};

#define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)

struct omap_framebuffer {
        struct drm_framebuffer base;
        int pin_count;
        const struct format *format;
        struct plane planes[4];
        /* lock for pinning (pin_count and planes.paddr) */
        struct mutex lock;
};

static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
                struct drm_file *file_priv,
                unsigned int *handle)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        return drm_gem_handle_create(file_priv,
                        omap_fb->planes[0].bo, handle);
}

static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        int i, n = drm_format_num_planes(fb->pixel_format);

        DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);

        drm_framebuffer_cleanup(fb);

        for (i = 0; i < n; i++) {
                struct plane *plane = &omap_fb->planes[i];

                drm_gem_object_unreference_unlocked(plane->bo);
        }

        kfree(omap_fb);
}

static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
        .create_handle = omap_framebuffer_create_handle,
        .destroy = omap_framebuffer_destroy,
};

static uint32_t get_linear_addr(struct plane *plane,
                const struct format *format, int n, int x, int y)
{
        uint32_t offset;

        offset = plane->offset +
                        (x * format->planes[n].stride_bpp) +
                        (y * plane->pitch / format->planes[n].sub_y);

        return plane->paddr + offset;
}

bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        struct plane *plane = &omap_fb->planes[0];

        return omap_gem_flags(plane->bo) & OMAP_BO_TILED;
}

/* update ovl info for scanout, handles cases of multi-planar fb's, etc.
 */
void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
                struct omap_drm_window *win, struct omap_overlay_info *info)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        const struct format *format = omap_fb->format;
        struct plane *plane = &omap_fb->planes[0];
        uint32_t x, y, orient = 0;

        info->color_mode = format->dss_format;

        info->pos_x      = win->crtc_x;
        info->pos_y      = win->crtc_y;
        info->out_width  = win->crtc_w;
        info->out_height = win->crtc_h;
        info->width      = win->src_w;
        info->height     = win->src_h;

        x = win->src_x;
        y = win->src_y;

        if (omap_gem_flags(plane->bo) & OMAP_BO_TILED) {
                uint32_t w = win->src_w;
                uint32_t h = win->src_h;

                switch (win->rotation & DRM_ROTATE_MASK) {
                default:
                        dev_err(fb->dev->dev, "invalid rotation: %02x",
                                        (uint32_t)win->rotation);
                        /* fallthru to default to no rotation */
                case 0:
                case DRM_ROTATE_0:
                        orient = 0;
                        break;
                case DRM_ROTATE_90:
                        orient = MASK_XY_FLIP | MASK_X_INVERT;
                        break;
                case DRM_ROTATE_180:
                        orient = MASK_X_INVERT | MASK_Y_INVERT;
                        break;
                case DRM_ROTATE_270:
                        orient = MASK_XY_FLIP | MASK_Y_INVERT;
                        break;
                }

                if (win->rotation & DRM_REFLECT_X)
                        orient ^= MASK_X_INVERT;

                if (win->rotation & DRM_REFLECT_Y)
                        orient ^= MASK_Y_INVERT;

                /* adjust x,y offset for flip/invert: */
                if (orient & MASK_XY_FLIP)
                        swap(w, h);
                if (orient & MASK_Y_INVERT)
                        y += h - 1;
                if (orient & MASK_X_INVERT)
                        x += w - 1;

                omap_gem_rotated_paddr(plane->bo, orient, x, y, &info->paddr);
                info->rotation_type = OMAP_DSS_ROT_TILER;
                info->screen_width  = omap_gem_tiled_stride(plane->bo, orient);
        } else {
                switch (win->rotation & DRM_ROTATE_MASK) {
                case 0:
                case DRM_ROTATE_0:
                        /* OK */
                        break;

                default:
                        dev_warn(fb->dev->dev,
                                "rotation '%d' ignored for non-tiled fb\n",
                                win->rotation);
                        win->rotation = 0;
                        break;
                }

                info->paddr         = get_linear_addr(plane, format, 0, x, y);
                info->rotation_type = OMAP_DSS_ROT_DMA;
                info->screen_width  = plane->pitch;
        }

        /* convert to pixels: */
        info->screen_width /= format->planes[0].stride_bpp;

        if (format->dss_format == OMAP_DSS_COLOR_NV12) {
                plane = &omap_fb->planes[1];

                if (info->rotation_type == OMAP_DSS_ROT_TILER) {
                        WARN_ON(!(omap_gem_flags(plane->bo) & OMAP_BO_TILED));
                        omap_gem_rotated_paddr(plane->bo, orient,
                                        x/2, y/2, &info->p_uv_addr);
                } else {
                        info->p_uv_addr = get_linear_addr(plane, format, 1, x, y);
                }
        } else {
                info->p_uv_addr = 0;
        }
}

/* pin, prepare for scanout: */
int omap_framebuffer_pin(struct drm_framebuffer *fb)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        int ret, i, n = drm_format_num_planes(fb->pixel_format);

        mutex_lock(&omap_fb->lock);

        if (omap_fb->pin_count > 0) {
                omap_fb->pin_count++;
                mutex_unlock(&omap_fb->lock);
                return 0;
        }

        for (i = 0; i < n; i++) {
                struct plane *plane = &omap_fb->planes[i];
                ret = omap_gem_get_paddr(plane->bo, &plane->paddr, true);
                if (ret)
                        goto fail;
                omap_gem_dma_sync(plane->bo, DMA_TO_DEVICE);
        }

        omap_fb->pin_count++;

        mutex_unlock(&omap_fb->lock);

        return 0;

fail:
        for (i--; i >= 0; i--) {
                struct plane *plane = &omap_fb->planes[i];
                omap_gem_put_paddr(plane->bo);
                plane->paddr = 0;
        }

        mutex_unlock(&omap_fb->lock);

        return ret;
}

/* unpin, no longer being scanned out: */
void omap_framebuffer_unpin(struct drm_framebuffer *fb)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        int i, n = drm_format_num_planes(fb->pixel_format);

        mutex_lock(&omap_fb->lock);

        omap_fb->pin_count--;

        if (omap_fb->pin_count > 0) {
                mutex_unlock(&omap_fb->lock);
                return;
        }

        for (i = 0; i < n; i++) {
                struct plane *plane = &omap_fb->planes[i];
                omap_gem_put_paddr(plane->bo);
                plane->paddr = 0;
        }

        mutex_unlock(&omap_fb->lock);
}

/* iterate thru all the connectors, returning ones that are attached
 * to the same fb..
 */
struct drm_connector *omap_framebuffer_get_next_connector(
                struct drm_framebuffer *fb, struct drm_connector *from)
{
        struct drm_device *dev = fb->dev;
        struct list_head *connector_list = &dev->mode_config.connector_list;
        struct drm_connector *connector = from;

        if (!from)
                return list_first_entry_or_null(connector_list, typeof(*from),
                                                head);

        list_for_each_entry_from(connector, connector_list, head) {
                if (connector != from) {
                        struct drm_encoder *encoder = connector->encoder;
                        struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
                        if (crtc && crtc->primary->fb == fb)
                                return connector;

                }
        }

        return NULL;
}

#ifdef CONFIG_DEBUG_FS
void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
{
        struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
        int i, n = drm_format_num_planes(fb->pixel_format);

        seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
                        (char *)&fb->pixel_format);

        for (i = 0; i < n; i++) {
                struct plane *plane = &omap_fb->planes[i];
                seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
                                i, plane->offset, plane->pitch);
                omap_gem_describe(plane->bo, m);
        }
}
#endif

struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
                struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_gem_object *bos[4];
        struct drm_framebuffer *fb;
        int ret;

        ret = objects_lookup(file, mode_cmd->pixel_format,
                        bos, mode_cmd->handles);
        if (ret)
                return ERR_PTR(ret);

        fb = omap_framebuffer_init(dev, mode_cmd, bos);
        if (IS_ERR(fb)) {
                int i, n = drm_format_num_planes(mode_cmd->pixel_format);
                for (i = 0; i < n; i++)
                        drm_gem_object_unreference_unlocked(bos[i]);
                return fb;
        }
        return fb;
}

struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
                const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
{
        struct omap_framebuffer *omap_fb = NULL;
        struct drm_framebuffer *fb = NULL;
        const struct format *format = NULL;
        int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);

        DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
                        dev, mode_cmd, mode_cmd->width, mode_cmd->height,
                        (char *)&mode_cmd->pixel_format);

        for (i = 0; i < ARRAY_SIZE(formats); i++) {
                if (formats[i].pixel_format == mode_cmd->pixel_format) {
                        format = &formats[i];
                        break;
                }
        }

        if (!format) {
                dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
                                (char *)&mode_cmd->pixel_format);
                ret = -EINVAL;
                goto fail;
        }

        omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
        if (!omap_fb) {
                ret = -ENOMEM;
                goto fail;
        }

        fb = &omap_fb->base;
        omap_fb->format = format;
        mutex_init(&omap_fb->lock);

        for (i = 0; i < n; i++) {
                struct plane *plane = &omap_fb->planes[i];
                int size, pitch = mode_cmd->pitches[i];

                if (pitch < (mode_cmd->width * format->planes[i].stride_bpp)) {
                        dev_err(dev->dev, "provided buffer pitch is too small! %d < %d\n",
                                        pitch, mode_cmd->width * format->planes[i].stride_bpp);
                        ret = -EINVAL;
                        goto fail;
                }

                if (pitch % format->planes[i].stride_bpp != 0) {
                        dev_err(dev->dev,
                                "buffer pitch (%d bytes) is not a multiple of pixel size (%d bytes)\n",
                                pitch, format->planes[i].stride_bpp);
                        ret = -EINVAL;
                        goto fail;
                }

                size = pitch * mode_cmd->height / format->planes[i].sub_y;

                if (size > (omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i])) {
                        dev_err(dev->dev, "provided buffer object is too small! %d < %d\n",
                                        bos[i]->size - mode_cmd->offsets[i], size);
                        ret = -EINVAL;
                        goto fail;
                }

                if (i > 0 && pitch != mode_cmd->pitches[i - 1]) {
                        dev_err(dev->dev,
                                "pitches are not the same between framebuffer planes %d != %d\n",
                                pitch, mode_cmd->pitches[i - 1]);
                        ret = -EINVAL;
                        goto fail;
                }

                plane->bo     = bos[i];
                plane->offset = mode_cmd->offsets[i];
                plane->pitch  = pitch;
                plane->paddr  = 0;
        }

        drm_helper_mode_fill_fb_struct(fb, mode_cmd);

        ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
        if (ret) {
                dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
                goto fail;
        }

        DBG("create: FB ID: %d (%p)", fb->base.id, fb);

        return fb;

fail:
        kfree(omap_fb);

        return ERR_PTR(ret);
}