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