exynos_drm_fbdev.c

Go to the documentation of this file.

/* exynos_drm_fbdev.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *  Inki Dae <[email protected]>
 *  Joonyoung Shim <[email protected]>
 *  Seung-Woo Kim <[email protected]>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

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

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"

#define MAX_CONNECTOR       4
#define PREFERRED_BPP       32

#define to_exynos_fbdev(x)  container_of(x, struct exynos_drm_fbdev,\
                drm_fb_helper)

struct exynos_drm_fbdev {
    struct drm_fb_helper        drm_fb_helper;
    struct exynos_drm_gem_obj   *exynos_gem_obj;
};

static struct fb_ops exynos_drm_fb_ops = {
    .owner      = THIS_MODULE,
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = cfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
    .fb_check_var   = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_blank   = drm_fb_helper_blank,
    .fb_pan_display = drm_fb_helper_pan_display,
    .fb_setcmap = drm_fb_helper_setcmap,
};

static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
                     struct drm_framebuffer *fb)
{
    struct fb_info *fbi = helper->fbdev;
    struct drm_device *dev = helper->dev;
    struct exynos_drm_gem_buf *buffer;
    unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
    unsigned long offset;

    DRM_DEBUG_KMS("%s\n", __FILE__);

    drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
    drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);

    /* RGB formats use only one buffer */
    buffer = exynos_drm_fb_buffer(fb, 0);
    if (!buffer) {
        DRM_LOG_KMS("buffer is null.\n");
        return -EFAULT;
    }

    /* buffer count to framebuffer always is 1 at booting time. */
    exynos_drm_fb_set_buf_cnt(fb, 1);

    offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
    offset += fbi->var.yoffset * fb->pitches[0];

    dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
    fbi->screen_base = buffer->kvaddr + offset;
    fbi->fix.smem_start = (unsigned long)(page_to_phys(buffer->pages[0]) +
                offset);
    fbi->screen_size = size;
    fbi->fix.smem_len = size;

    return 0;
}

static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
                    struct drm_fb_helper_surface_size *sizes)
{
    struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
    struct exynos_drm_gem_obj *exynos_gem_obj;
    struct drm_device *dev = helper->dev;
    struct fb_info *fbi;
    struct drm_mode_fb_cmd2 mode_cmd = { 0 };
    struct platform_device *pdev = dev->platformdev;
    unsigned long size;
    int ret;

    DRM_DEBUG_KMS("%s\n", __FILE__);

    DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
            sizes->surface_width, sizes->surface_height,
            sizes->surface_bpp);

    mode_cmd.width = sizes->surface_width;
    mode_cmd.height = sizes->surface_height;
    mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
    mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                              sizes->surface_depth);

    mutex_lock(&dev->struct_mutex);

    fbi = framebuffer_alloc(0, &pdev->dev);
    if (!fbi) {
        DRM_ERROR("failed to allocate fb info.\n");
        ret = -ENOMEM;
        goto out;
    }

    size = mode_cmd.pitches[0] * mode_cmd.height;

    /* 0 means to allocate physically continuous memory */
    exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
    if (IS_ERR(exynos_gem_obj)) {
        ret = PTR_ERR(exynos_gem_obj);
        goto out;
    }

    exynos_fbdev->exynos_gem_obj = exynos_gem_obj;

    helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
            &exynos_gem_obj->base);
    if (IS_ERR_OR_NULL(helper->fb)) {
        DRM_ERROR("failed to create drm framebuffer.\n");
        ret = PTR_ERR(helper->fb);
        goto out;
    }

    helper->fbdev = fbi;

    fbi->par = helper;
    fbi->flags = FBINFO_FLAG_DEFAULT;
    fbi->fbops = &exynos_drm_fb_ops;

    ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
    if (ret) {
        DRM_ERROR("failed to allocate cmap.\n");
        goto out;
    }

    ret = exynos_drm_fbdev_update(helper, helper->fb);
    if (ret < 0) {
        fb_dealloc_cmap(&fbi->cmap);
        goto out;
    }

/*
 * if failed, all resources allocated above would be released by
 * drm_mode_config_cleanup() when drm_load() had been called prior
 * to any specific driver such as fimd or hdmi driver.
 */
out:
    mutex_unlock(&dev->struct_mutex);
    return ret;
}

static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
                   struct drm_fb_helper_surface_size *sizes)
{
    int ret = 0;

    DRM_DEBUG_KMS("%s\n", __FILE__);

    /*
     * with !helper->fb, it means that this funcion is called first time
     * and after that, the helper->fb would be used as clone mode.
     */
    if (!helper->fb) {
        ret = exynos_drm_fbdev_create(helper, sizes);
        if (ret < 0) {
            DRM_ERROR("failed to create fbdev.\n");
            return ret;
        }

        /*
         * fb_helper expects a value more than 1 if succeed
         * because register_framebuffer() should be called.
         */
        ret = 1;
    }

    return ret;
}

static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
    .fb_probe = exynos_drm_fbdev_probe,
};

int exynos_drm_fbdev_init(struct drm_device *dev)
{
    struct exynos_drm_fbdev *fbdev;
    struct exynos_drm_private *private = dev->dev_private;
    struct drm_fb_helper *helper;
    unsigned int num_crtc;
    int ret;

    DRM_DEBUG_KMS("%s\n", __FILE__);

    if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
        return 0;

    fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
    if (!fbdev) {
        DRM_ERROR("failed to allocate drm fbdev.\n");
        return -ENOMEM;
    }

    private->fb_helper = helper = &fbdev->drm_fb_helper;
    helper->funcs = &exynos_drm_fb_helper_funcs;

    num_crtc = dev->mode_config.num_crtc;

    ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
    if (ret < 0) {
        DRM_ERROR("failed to initialize drm fb helper.\n");
        goto err_init;
    }

    ret = drm_fb_helper_single_add_all_connectors(helper);
    if (ret < 0) {
        DRM_ERROR("failed to register drm_fb_helper_connector.\n");
        goto err_setup;

    }

    ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
    if (ret < 0) {
        DRM_ERROR("failed to set up hw configuration.\n");
        goto err_setup;
    }

    return 0;

err_setup:
    drm_fb_helper_fini(helper);

err_init:
    private->fb_helper = NULL;
    kfree(fbdev);

    return ret;
}

static void exynos_drm_fbdev_destroy(struct drm_device *dev,
                      struct drm_fb_helper *fb_helper)
{
    struct drm_framebuffer *fb;

    /* release drm framebuffer and real buffer */
    if (fb_helper->fb && fb_helper->fb->funcs) {
        fb = fb_helper->fb;
        if (fb)
            drm_framebuffer_remove(fb);
    }

    /* release linux framebuffer */
    if (fb_helper->fbdev) {
        struct fb_info *info;
        int ret;

        info = fb_helper->fbdev;
        ret = unregister_framebuffer(info);
        if (ret < 0)
            DRM_DEBUG_KMS("failed unregister_framebuffer()\n");

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

        framebuffer_release(info);
    }

    drm_fb_helper_fini(fb_helper);
}

void exynos_drm_fbdev_fini(struct drm_device *dev)
{
    struct exynos_drm_private *private = dev->dev_private;
    struct exynos_drm_fbdev *fbdev;

    if (!private || !private->fb_helper)
        return;

    fbdev = to_exynos_fbdev(private->fb_helper);

    if (fbdev->exynos_gem_obj)
        exynos_drm_gem_destroy(fbdev->exynos_gem_obj);

    exynos_drm_fbdev_destroy(dev, private->fb_helper);
    kfree(fbdev);
    private->fb_helper = NULL;
}

void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
{
    struct exynos_drm_private *private = dev->dev_private;

    if (!private || !private->fb_helper)
        return;

    drm_fb_helper_restore_fbdev_mode(private->fb_helper);
}