mgag200_fb.c

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/*
 * Copyright 2010 Matt Turner.
 * Copyright 2012 Red Hat
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Matt Turner
 *          Dave Airlie
 */
#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm_fb_helper.h>

#include <linux/fb.h>

#include "mgag200_drv.h"

static void mga_dirty_update(struct mga_fbdev *mfbdev,
                 int x, int y, int width, int height)
{
    int i;
    struct drm_gem_object *obj;
    struct mgag200_bo *bo;
    int src_offset, dst_offset;
    int bpp = (mfbdev->mfb.base.bits_per_pixel + 7)/8;
    int ret;
    bool unmap = false;

    obj = mfbdev->mfb.obj;
    bo = gem_to_mga_bo(obj);

    ret = mgag200_bo_reserve(bo, true);
    if (ret) {
        DRM_ERROR("failed to reserve fb bo\n");
        return;
    }

    if (!bo->kmap.virtual) {
        ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
        if (ret) {
            DRM_ERROR("failed to kmap fb updates\n");
            mgag200_bo_unreserve(bo);
            return;
        }
        unmap = true;
    }
    for (i = y; i < y + height; i++) {
        /* assume equal stride for now */
        src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
        memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, width * bpp);

    }
    if (unmap)
        ttm_bo_kunmap(&bo->kmap);

    mgag200_bo_unreserve(bo);
}

static void mga_fillrect(struct fb_info *info,
             const struct fb_fillrect *rect)
{
    struct mga_fbdev *mfbdev = info->par;
    sys_fillrect(info, rect);
    mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
             rect->height);
}

static void mga_copyarea(struct fb_info *info,
             const struct fb_copyarea *area)
{
    struct mga_fbdev *mfbdev = info->par;
    sys_copyarea(info, area);
    mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
             area->height);
}

static void mga_imageblit(struct fb_info *info,
              const struct fb_image *image)
{
    struct mga_fbdev *mfbdev = info->par;
    sys_imageblit(info, image);
    mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
             image->height);
}


static struct fb_ops mgag200fb_ops = {
    .owner = THIS_MODULE,
    .fb_check_var = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_fillrect = mga_fillrect,
    .fb_copyarea = mga_copyarea,
    .fb_imageblit = mga_imageblit,
    .fb_pan_display = drm_fb_helper_pan_display,
    .fb_blank = drm_fb_helper_blank,
    .fb_setcmap = drm_fb_helper_setcmap,
};

static int mgag200fb_create_object(struct mga_fbdev *afbdev,
                   struct drm_mode_fb_cmd2 *mode_cmd,
                   struct drm_gem_object **gobj_p)
{
    struct drm_device *dev = afbdev->helper.dev;
    u32 bpp, depth;
    u32 size;
    struct drm_gem_object *gobj;

    int ret = 0;
    drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

    size = mode_cmd->pitches[0] * mode_cmd->height;
    ret = mgag200_gem_create(dev, size, true, &gobj);
    if (ret)
        return ret;

    *gobj_p = gobj;
    return ret;
}

static int mgag200fb_create(struct mga_fbdev *mfbdev,
               struct drm_fb_helper_surface_size *sizes)
{
    struct drm_device *dev = mfbdev->helper.dev;
    struct drm_mode_fb_cmd2 mode_cmd;
    struct mga_device *mdev = dev->dev_private;
    struct fb_info *info;
    struct drm_framebuffer *fb;
    struct drm_gem_object *gobj = NULL;
    struct device *device = &dev->pdev->dev;
    struct mgag200_bo *bo;
    int ret;
    void *sysram;
    int size;

    mode_cmd.width = sizes->surface_width;
    mode_cmd.height = sizes->surface_height;
    mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);

    mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                              sizes->surface_depth);
    size = mode_cmd.pitches[0] * mode_cmd.height;

    ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
    if (ret) {
        DRM_ERROR("failed to create fbcon backing object %d\n", ret);
        return ret;
    }
    bo = gem_to_mga_bo(gobj);

    sysram = vmalloc(size);
    if (!sysram)
        return -ENOMEM;

    info = framebuffer_alloc(0, device);
    if (info == NULL)
        return -ENOMEM;

    info->par = mfbdev;

    ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
    if (ret)
        return ret;

    mfbdev->sysram = sysram;
    mfbdev->size = size;

    fb = &mfbdev->mfb.base;

    /* setup helper */
    mfbdev->helper.fb = fb;
    mfbdev->helper.fbdev = info;

    ret = fb_alloc_cmap(&info->cmap, 256, 0);
    if (ret) {
        DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
        ret = -ENOMEM;
        goto out;
    }

    strcpy(info->fix.id, "mgadrmfb");

    info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
    info->fbops = &mgag200fb_ops;

    /* setup aperture base/size for vesafb takeover */
    info->apertures = alloc_apertures(1);
    if (!info->apertures) {
        ret = -ENOMEM;
        goto out;
    }
    info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
    info->apertures->ranges[0].size = mdev->mc.vram_size;

    drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
    drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
                   sizes->fb_height);

    info->screen_base = sysram;
    info->screen_size = size;
    info->pixmap.flags = FB_PIXMAP_SYSTEM;

    DRM_DEBUG_KMS("allocated %dx%d\n",
              fb->width, fb->height);
    return 0;
out:
    return ret;
}

static int mga_fb_find_or_create_single(struct drm_fb_helper *helper,
                       struct drm_fb_helper_surface_size
                       *sizes)
{
    struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
    int new_fb = 0;
    int ret;

    if (!helper->fb) {
        ret = mgag200fb_create(mfbdev, sizes);
        if (ret)
            return ret;
        new_fb = 1;
    }
    return new_fb;
}

static int mga_fbdev_destroy(struct drm_device *dev,
                struct mga_fbdev *mfbdev)
{
    struct fb_info *info;
    struct mga_framebuffer *mfb = &mfbdev->mfb;

    if (mfbdev->helper.fbdev) {
        info = mfbdev->helper.fbdev;

        unregister_framebuffer(info);
        if (info->cmap.len)
            fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }

    if (mfb->obj) {
        drm_gem_object_unreference_unlocked(mfb->obj);
        mfb->obj = NULL;
    }
    drm_fb_helper_fini(&mfbdev->helper);
    vfree(mfbdev->sysram);
    drm_framebuffer_cleanup(&mfb->base);

    return 0;
}

static struct drm_fb_helper_funcs mga_fb_helper_funcs = {
    .gamma_set = mga_crtc_fb_gamma_set,
    .gamma_get = mga_crtc_fb_gamma_get,
    .fb_probe = mga_fb_find_or_create_single,
};

int mgag200_fbdev_init(struct mga_device *mdev)
{
    struct mga_fbdev *mfbdev;
    int ret;

    mfbdev = kzalloc(sizeof(struct mga_fbdev), GFP_KERNEL);
    if (!mfbdev)
        return -ENOMEM;

    mdev->mfbdev = mfbdev;
    mfbdev->helper.funcs = &mga_fb_helper_funcs;

    ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
                 mdev->num_crtc, MGAG200FB_CONN_LIMIT);
    if (ret) {
        kfree(mfbdev);
        return ret;
    }
    drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
    drm_fb_helper_initial_config(&mfbdev->helper, 32);

    return 0;
}

void mgag200_fbdev_fini(struct mga_device *mdev)
{
    if (!mdev->mfbdev)
        return;

    mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
    kfree(mdev->mfbdev);
    mdev->mfbdev = NULL;
}