cirrus_fbdev.c

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/*
 * 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
 *          Dave Airlie
 */
#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm_fb_helper.h>

#include <linux/fb.h>

#include "cirrus_drv.h"

static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
                 int x, int y, int width, int height)
{
    int i;
    struct drm_gem_object *obj;
    struct cirrus_bo *bo;
    int src_offset, dst_offset;
    int bpp = (afbdev->gfb.base.bits_per_pixel + 7)/8;
    int ret;
    bool unmap = false;

    obj = afbdev->gfb.obj;
    bo = gem_to_cirrus_bo(obj);

    ret = cirrus_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");
            cirrus_bo_unreserve(bo);
            return;
        }
        unmap = true;
    }
    for (i = y; i < y + height; i++) {
        /* assume equal stride for now */
        src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
        memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);

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

    cirrus_bo_unreserve(bo);
}

static void cirrus_fillrect(struct fb_info *info,
             const struct fb_fillrect *rect)
{
    struct cirrus_fbdev *afbdev = info->par;
    sys_fillrect(info, rect);
    cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
             rect->height);
}

static void cirrus_copyarea(struct fb_info *info,
             const struct fb_copyarea *area)
{
    struct cirrus_fbdev *afbdev = info->par;
    sys_copyarea(info, area);
    cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
             area->height);
}

static void cirrus_imageblit(struct fb_info *info,
              const struct fb_image *image)
{
    struct cirrus_fbdev *afbdev = info->par;
    sys_imageblit(info, image);
    cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
             image->height);
}


static struct fb_ops cirrusfb_ops = {
    .owner = THIS_MODULE,
    .fb_check_var = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_fillrect = cirrus_fillrect,
    .fb_copyarea = cirrus_copyarea,
    .fb_imageblit = cirrus_imageblit,
    .fb_pan_display = drm_fb_helper_pan_display,
    .fb_blank = drm_fb_helper_blank,
    .fb_setcmap = drm_fb_helper_setcmap,
};

static int cirrusfb_create_object(struct cirrus_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);

    if (bpp > 24)
        return -EINVAL;
    size = mode_cmd->pitches[0] * mode_cmd->height;
    ret = cirrus_gem_create(dev, size, true, &gobj);
    if (ret)
        return ret;

    *gobj_p = gobj;
    return ret;
}

static int cirrusfb_create(struct cirrus_fbdev *gfbdev,
               struct drm_fb_helper_surface_size *sizes)
{
    struct drm_device *dev = gfbdev->helper.dev;
    struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
    struct fb_info *info;
    struct drm_framebuffer *fb;
    struct drm_mode_fb_cmd2 mode_cmd;
    struct device *device = &dev->pdev->dev;
    void *sysram;
    struct drm_gem_object *gobj = NULL;
    struct cirrus_bo *bo = NULL;
    int size, ret;

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

    bo = gem_to_cirrus_bo(gobj);

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

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

    info->par = gfbdev;

    ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
    if (ret)
        return ret;

    gfbdev->sysram = sysram;
    gfbdev->size = size;

    fb = &gfbdev->gfb.base;
    if (!fb) {
        DRM_INFO("fb is NULL\n");
        return -EINVAL;
    }

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

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


    info->flags = FBINFO_DEFAULT;
    info->fbops = &cirrusfb_ops;

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

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

    info->screen_base = sysram;
    info->screen_size = size;

    info->fix.mmio_start = 0;
    info->fix.mmio_len = 0;

    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_iounmap;
    }

    DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
    DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
    DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
    DRM_INFO("fb depth is %d\n", fb->depth);
    DRM_INFO("   pitch is %d\n", fb->pitches[0]);

    return 0;
out_iounmap:
    return ret;
}

static int cirrus_fb_find_or_create_single(struct drm_fb_helper *helper,
                       struct drm_fb_helper_surface_size
                       *sizes)
{
    struct cirrus_fbdev *gfbdev = (struct cirrus_fbdev *)helper;
    int new_fb = 0;
    int ret;

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

static int cirrus_fbdev_destroy(struct drm_device *dev,
                struct cirrus_fbdev *gfbdev)
{
    struct fb_info *info;
    struct cirrus_framebuffer *gfb = &gfbdev->gfb;

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

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

    if (gfb->obj) {
        drm_gem_object_unreference_unlocked(gfb->obj);
        gfb->obj = NULL;
    }

    vfree(gfbdev->sysram);
    drm_fb_helper_fini(&gfbdev->helper);
    drm_framebuffer_cleanup(&gfb->base);

    return 0;
}

static struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
    .gamma_set = cirrus_crtc_fb_gamma_set,
    .gamma_get = cirrus_crtc_fb_gamma_get,
    .fb_probe = cirrus_fb_find_or_create_single,
};

int cirrus_fbdev_init(struct cirrus_device *cdev)
{
    struct cirrus_fbdev *gfbdev;
    int ret;
    int bpp_sel = 24;

    /*bpp_sel = 8;*/
    gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
    if (!gfbdev)
        return -ENOMEM;

    cdev->mode_info.gfbdev = gfbdev;
    gfbdev->helper.funcs = &cirrus_fb_helper_funcs;

    ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
                 cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
    if (ret) {
        kfree(gfbdev);
        return ret;
    }
    drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
    drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);

    return 0;
}

void cirrus_fbdev_fini(struct cirrus_device *cdev)
{
    if (!cdev->mode_info.gfbdev)
        return;

    cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
    kfree(cdev->mode_info.gfbdev);
    cdev->mode_info.gfbdev = NULL;
}