drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drm.h>
  16 #include <drm/drmP.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_crtc_helper.h>
  19
  20 #include "rockchip_drm_drv.h"
  21 #include "rockchip_drm_gem.h"
  22 #include "rockchip_drm_fb.h"
  23 #include "rockchip_drm_fbdev.h"
  24
  25 #define PREFERRED_BPP           32
  26 #define to_drm_private(x) \
  27                 container_of(x, struct rockchip_drm_private, fbdev_helper)
  28
  29 static int rockchip_fbdev_mmap(struct fb_info *info,
  30                                struct vm_area_struct *vma)
  31 {
  32         struct drm_fb_helper *helper = info->par;
  33         struct rockchip_drm_private *private = to_drm_private(helper);
  34
  35         return rockchip_gem_mmap_buf(private->fbdev_bo, vma);
  36 }
  37
  38 static struct fb_ops rockchip_drm_fbdev_ops = {
  39         .owner          = THIS_MODULE,
  40         DRM_FB_HELPER_DEFAULT_OPS,
  41         .fb_mmap        = rockchip_fbdev_mmap,
  42         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  43         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  44         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  45 };
  46
  47 static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
  48                                      struct drm_fb_helper_surface_size *sizes)
  49 {
  50         struct rockchip_drm_private *private = to_drm_private(helper);
  51         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
  52         struct drm_device *dev = helper->dev;
  53         struct rockchip_gem_object *rk_obj;
  54         struct drm_framebuffer *fb;
  55         unsigned int bytes_per_pixel;
  56         unsigned long offset;
  57         struct fb_info *fbi;
  58         size_t size;
  59         int ret;
  60
  61         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
  62
  63         mode_cmd.width = sizes->surface_width;
  64         mode_cmd.height = sizes->surface_height;
  65         mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
  66         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  67                 sizes->surface_depth);
  68
  69         size = mode_cmd.pitches[0] * mode_cmd.height;
  70
  71         rk_obj = rockchip_gem_create_object(dev, size, true);
  72         if (IS_ERR(rk_obj))
  73                 return -ENOMEM;
  74
  75         private->fbdev_bo = &rk_obj->base;
  76
  77         fbi = drm_fb_helper_alloc_fbi(helper);
  78         if (IS_ERR(fbi)) {
  79                 dev_err(dev->dev, "Failed to create framebuffer info.\n");
  80                 ret = PTR_ERR(fbi);
  81                 goto err_rockchip_gem_free_object;
  82         }
  83
  84         helper->fb = rockchip_drm_framebuffer_init(dev, &mode_cmd,
  85                                                    private->fbdev_bo);
  86         if (IS_ERR(helper->fb)) {
  87                 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
  88                 ret = PTR_ERR(helper->fb);
  89                 goto err_release_fbi;
  90         }
  91
  92         fbi->par = helper;
  93         fbi->flags = FBINFO_FLAG_DEFAULT;
  94         fbi->fbops = &rockchip_drm_fbdev_ops;
  95
  96         fb = helper->fb;
  97         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  98         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  99
 100         offset = fbi->var.xoffset * bytes_per_pixel;
 101         offset += fbi->var.yoffset * fb->pitches[0];
 102
 103         dev->mode_config.fb_base = 0;
 104         fbi->screen_base = rk_obj->kvaddr + offset;
 105         fbi->screen_size = rk_obj->base.size;
 106         fbi->fix.smem_len = rk_obj->base.size;
 107
 108         DRM_DEBUG_KMS("FB [%dx%d]-%d kvaddr=%p offset=%ld size=%zu\n",
 109                       fb->width, fb->height, fb->depth, rk_obj->kvaddr,
 110                       offset, size);
 111
 112         fbi->skip_vt_switch = true;
 113
 114         return 0;
 115
 116 err_release_fbi:
 117         drm_fb_helper_release_fbi(helper);
 118 err_rockchip_gem_free_object:
 119         rockchip_gem_free_object(&rk_obj->base);
 120         return ret;
 121 }
 122
 123 static const struct drm_fb_helper_funcs rockchip_drm_fb_helper_funcs = {
 124         .fb_probe = rockchip_drm_fbdev_create,
 125 };
 126
 127 int rockchip_drm_fbdev_init(struct drm_device *dev)
 128 {
 129         struct rockchip_drm_private *private = dev->dev_private;
 130         struct drm_fb_helper *helper;
 131         unsigned int num_crtc;
 132         int ret;
 133
 134         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 135                 return -EINVAL;
 136
 137         num_crtc = dev->mode_config.num_crtc;
 138
 139         helper = &private->fbdev_helper;
 140
 141         drm_fb_helper_prepare(dev, helper, &rockchip_drm_fb_helper_funcs);
 142
 143         ret = drm_fb_helper_init(dev, helper, num_crtc, ROCKCHIP_MAX_CONNECTOR);
 144         if (ret < 0) {
 145                 dev_err(dev->dev, "Failed to initialize drm fb helper - %d.\n",
 146                         ret);
 147                 return ret;
 148         }
 149
 150         ret = drm_fb_helper_single_add_all_connectors(helper);
 151         if (ret < 0) {
 152                 dev_err(dev->dev, "Failed to add connectors - %d.\n", ret);
 153                 goto err_drm_fb_helper_fini;
 154         }
 155
 156         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 157         if (ret < 0) {
 158                 dev_err(dev->dev, "Failed to set initial hw config - %d.\n",
 159                         ret);
 160                 goto err_drm_fb_helper_fini;
 161         }
 162
 163         return 0;
 164
 165 err_drm_fb_helper_fini:
 166         drm_fb_helper_fini(helper);
 167         return ret;
 168 }
 169
 170 void rockchip_drm_fbdev_fini(struct drm_device *dev)
 171 {
 172         struct rockchip_drm_private *private = dev->dev_private;
 173         struct drm_fb_helper *helper;
 174
 175         helper = &private->fbdev_helper;
 176
 177         drm_fb_helper_unregister_fbi(helper);
 178         drm_fb_helper_release_fbi(helper);
 179
 180         if (helper->fb)
 181                 drm_framebuffer_unreference(helper->fb);
 182
 183         drm_fb_helper_fini(helper);
 184 }