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
  24 #define PREFERRED_BPP           32
  25
  26 static int rockchip_fbdev_mmap(struct fb_info *info,
  27                                struct vm_area_struct *vma)
  28 {
  29         struct drm_fb_helper *helper = info->par;
  30         struct rockchip_drm_private *private = helper->dev->dev_private;
  31
  32         return rockchip_gem_mmap_buf(private->fbdev_bo, vma);
  33 }
  34
  35 static struct fb_ops rockchip_drm_fbdev_ops = {
  36         .owner          = THIS_MODULE,
  37         .fb_mmap        = rockchip_fbdev_mmap,
  38         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  39         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  40         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  41         .fb_check_var   = drm_fb_helper_check_var,
  42         .fb_set_par     = drm_fb_helper_set_par,
  43         .fb_blank       = drm_fb_helper_blank,
  44         .fb_pan_display = drm_fb_helper_pan_display,
  45         .fb_setcmap     = drm_fb_helper_setcmap,
  46 };
  47
  48 static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
  49                                      struct drm_fb_helper_surface_size *sizes)
  50 {
  51         struct rockchip_drm_private *private = helper->dev->dev_private;
  52         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
  53         struct drm_device *dev = helper->dev;
  54         struct rockchip_gem_object *rk_obj;
  55         struct drm_framebuffer *fb;
  56         unsigned int bytes_per_pixel;
  57         unsigned long offset;
  58         struct fb_info *fbi;
  59         size_t size;
  60         int ret;
  61
  62         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
  63
  64         mode_cmd.width = sizes->surface_width;
  65         mode_cmd.height = sizes->surface_height;
  66         mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
  67         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  68                 sizes->surface_depth);
  69
  70         size = mode_cmd.pitches[0] * mode_cmd.height;
  71
  72         rk_obj = rockchip_gem_create_object(dev, size, true);
  73         if (IS_ERR(rk_obj))
  74                 return -ENOMEM;
  75
  76         private->fbdev_bo = &rk_obj->base;
  77
  78         fbi = drm_fb_helper_alloc_fbi(helper);
  79         if (IS_ERR(fbi)) {
  80                 dev_err(dev->dev, "Failed to create framebuffer info.\n");
  81                 ret = PTR_ERR(fbi);
  82                 goto err_rockchip_gem_free_object;
  83         }
  84
  85         helper->fb = rockchip_drm_framebuffer_init(dev, &mode_cmd,
  86                                                    private->fbdev_bo);
  87         if (IS_ERR(helper->fb)) {
  88                 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
  89                 ret = PTR_ERR(helper->fb);
  90                 goto err_release_fbi;
  91         }
  92
  93         fbi->par = helper;
  94         fbi->flags = FBINFO_FLAG_DEFAULT;
  95         fbi->fbops = &rockchip_drm_fbdev_ops;
  96
  97         fb = helper->fb;
  98         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  99         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 100
 101         offset = fbi->var.xoffset * bytes_per_pixel;
 102         offset += fbi->var.yoffset * fb->pitches[0];
 103
 104         dev->mode_config.fb_base = 0;
 105         fbi->screen_base = rk_obj->kvaddr + offset;
 106         fbi->screen_size = rk_obj->base.size;
 107         fbi->fix.smem_len = rk_obj->base.size;
 108
 109         DRM_DEBUG_KMS("FB [%dx%d]-%d kvaddr=%p offset=%ld size=%zu\n",
 110                       fb->width, fb->height, fb->depth, rk_obj->kvaddr,
 111                       offset, size);
 112
 113         fbi->skip_vt_switch = true;
 114
 115         return 0;
 116
 117 err_release_fbi:
 118         drm_fb_helper_release_fbi(helper);
 119 err_rockchip_gem_free_object:
 120         rockchip_gem_free_object(&rk_obj->base);
 121         return ret;
 122 }
 123
 124 static const struct drm_fb_helper_funcs rockchip_drm_fb_helper_funcs = {
 125         .fb_probe = rockchip_drm_fbdev_create,
 126 };
 127
 128 int rockchip_drm_fbdev_init(struct drm_device *dev)
 129 {
 130         struct rockchip_drm_private *private = dev->dev_private;
 131         struct drm_fb_helper *helper;
 132         unsigned int num_crtc;
 133         int ret;
 134
 135         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 136                 return -EINVAL;
 137
 138         num_crtc = dev->mode_config.num_crtc;
 139
 140         helper = devm_kzalloc(dev->dev, sizeof(*helper), GFP_KERNEL);
 141         if (!helper)
 142                 return -ENOMEM;
 143
 144         private->fbdev_helper = helper;
 145
 146         drm_fb_helper_prepare(dev, helper, &rockchip_drm_fb_helper_funcs);
 147
 148         ret = drm_fb_helper_init(dev, helper, num_crtc, ROCKCHIP_MAX_CONNECTOR);
 149         if (ret < 0) {
 150                 dev_err(dev->dev, "Failed to initialize drm fb helper - %d.\n",
 151                         ret);
 152                 return ret;
 153         }
 154
 155         ret = drm_fb_helper_single_add_all_connectors(helper);
 156         if (ret < 0) {
 157                 dev_err(dev->dev, "Failed to add connectors - %d.\n", ret);
 158                 goto err_drm_fb_helper_fini;
 159         }
 160
 161         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 162         if (ret < 0) {
 163                 dev_err(dev->dev, "Failed to set initial hw config - %d.\n",
 164                         ret);
 165                 goto err_drm_fb_helper_fini;
 166         }
 167
 168         return 0;
 169
 170 err_drm_fb_helper_fini:
 171         drm_fb_helper_fini(helper);
 172         return ret;
 173 }
 174
 175 void rockchip_drm_fbdev_fini(struct drm_device *dev)
 176 {
 177         struct rockchip_drm_private *private = dev->dev_private;
 178         struct drm_fb_helper *helper = private->fbdev_helper;
 179
 180         if (!helper)
 181                 return;
 182
 183         drm_fb_helper_unregister_fbi(helper);
 184         drm_fb_helper_release_fbi(helper);
 185
 186         if (helper->fb)
 187                 drm_framebuffer_unreference(helper->fb);
 188
 189         drm_fb_helper_fini(helper);
 190 }