kernel/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 #define to_drm_private(x) \
  26                 container_of(x, struct rockchip_drm_private, fbdev_helper)
  27
  28 static int rockchip_fbdev_mmap(struct fb_info *info,
  29                                struct vm_area_struct *vma)
  30 {
  31         struct drm_fb_helper *helper = info->par;
  32         struct rockchip_drm_private *private = to_drm_private(helper);
  33
  34         return rockchip_gem_mmap_buf(private->fbdev_bo, vma);
  35 }
  36
  37 static struct fb_ops rockchip_drm_fbdev_ops = {
  38         .owner          = THIS_MODULE,
  39         .fb_mmap        = rockchip_fbdev_mmap,
  40         .fb_fillrect    = cfb_fillrect,
  41         .fb_copyarea    = cfb_copyarea,
  42         .fb_imageblit   = cfb_imageblit,
  43         .fb_check_var   = drm_fb_helper_check_var,
  44         .fb_set_par     = drm_fb_helper_set_par,
  45         .fb_blank       = drm_fb_helper_blank,
  46         .fb_pan_display = drm_fb_helper_pan_display,
  47         .fb_setcmap     = drm_fb_helper_setcmap,
  48 };
  49
  50 static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
  51                                      struct drm_fb_helper_surface_size *sizes)
  52 {
  53         struct rockchip_drm_private *private = to_drm_private(helper);
  54         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
  55         struct drm_device *dev = helper->dev;
  56         struct rockchip_gem_object *rk_obj;
  57         struct drm_framebuffer *fb;
  58         unsigned int bytes_per_pixel;
  59         unsigned long offset;
  60         struct fb_info *fbi;
  61         size_t size;
  62         int ret;
  63
  64         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
  65
  66         mode_cmd.width = sizes->surface_width;
  67         mode_cmd.height = sizes->surface_height;
  68         mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
  69         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  70                 sizes->surface_depth);
  71
  72         size = mode_cmd.pitches[0] * mode_cmd.height;
  73
  74         rk_obj = rockchip_gem_create_object(dev, size, true);
  75         if (IS_ERR(rk_obj))
  76                 return -ENOMEM;
  77
  78         private->fbdev_bo = &rk_obj->base;
  79
  80         fbi = framebuffer_alloc(0, dev->dev);
  81         if (!fbi) {
  82                 dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
  83                 ret = -ENOMEM;
  84                 goto err_rockchip_gem_free_object;
  85         }
  86
  87         helper->fb = rockchip_drm_framebuffer_init(dev, &mode_cmd,
  88                                                    private->fbdev_bo);
  89         if (IS_ERR(helper->fb)) {
  90                 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
  91                 ret = PTR_ERR(helper->fb);
  92                 goto err_framebuffer_release;
  93         }
  94
  95         helper->fbdev = fbi;
  96
  97         fbi->par = helper;
  98         fbi->flags = FBINFO_FLAG_DEFAULT;
  99         fbi->fbops = &rockchip_drm_fbdev_ops;
 100
 101         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 102         if (ret) {
 103                 dev_err(dev->dev, "Failed to allocate color map.\n");
 104                 goto err_drm_framebuffer_unref;
 105         }
 106
 107         fb = helper->fb;
 108         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 109         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 110
 111         offset = fbi->var.xoffset * bytes_per_pixel;
 112         offset += fbi->var.yoffset * fb->pitches[0];
 113
 114         dev->mode_config.fb_base = 0;
 115         fbi->screen_base = rk_obj->kvaddr + offset;
 116         fbi->screen_size = rk_obj->base.size;
 117         fbi->fix.smem_len = rk_obj->base.size;
 118
 119         DRM_DEBUG_KMS("FB [%dx%d]-%d kvaddr=%p offset=%ld size=%d\n",
 120                       fb->width, fb->height, fb->depth, rk_obj->kvaddr,
 121                       offset, size);
 122
 123         fbi->skip_vt_switch = true;
 124
 125         return 0;
 126
 127 err_drm_framebuffer_unref:
 128         drm_framebuffer_unreference(helper->fb);
 129 err_framebuffer_release:
 130         framebuffer_release(fbi);
 131 err_rockchip_gem_free_object:
 132         rockchip_gem_free_object(&rk_obj->base);
 133         return ret;
 134 }
 135
 136 static const struct drm_fb_helper_funcs rockchip_drm_fb_helper_funcs = {
 137         .fb_probe = rockchip_drm_fbdev_create,
 138 };
 139
 140 int rockchip_drm_fbdev_init(struct drm_device *dev)
 141 {
 142         struct rockchip_drm_private *private = dev->dev_private;
 143         struct drm_fb_helper *helper;
 144         unsigned int num_crtc;
 145         int ret;
 146
 147         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 148                 return -EINVAL;
 149
 150         num_crtc = dev->mode_config.num_crtc;
 151
 152         helper = &private->fbdev_helper;
 153
 154         drm_fb_helper_prepare(dev, helper, &rockchip_drm_fb_helper_funcs);
 155
 156         ret = drm_fb_helper_init(dev, helper, num_crtc, ROCKCHIP_MAX_CONNECTOR);
 157         if (ret < 0) {
 158                 dev_err(dev->dev, "Failed to initialize drm fb helper - %d.\n",
 159                         ret);
 160                 return ret;
 161         }
 162
 163         ret = drm_fb_helper_single_add_all_connectors(helper);
 164         if (ret < 0) {
 165                 dev_err(dev->dev, "Failed to add connectors - %d.\n", ret);
 166                 goto err_drm_fb_helper_fini;
 167         }
 168
 169         /* disable all the possible outputs/crtcs before entering KMS mode */
 170         drm_helper_disable_unused_functions(dev);
 171
 172         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 173         if (ret < 0) {
 174                 dev_err(dev->dev, "Failed to set initial hw config - %d.\n",
 175                         ret);
 176                 goto err_drm_fb_helper_fini;
 177         }
 178
 179         return 0;
 180
 181 err_drm_fb_helper_fini:
 182         drm_fb_helper_fini(helper);
 183         return ret;
 184 }
 185
 186 void rockchip_drm_fbdev_fini(struct drm_device *dev)
 187 {
 188         struct rockchip_drm_private *private = dev->dev_private;
 189         struct drm_fb_helper *helper;
 190
 191         helper = &private->fbdev_helper;
 192
 193         if (helper->fbdev) {
 194                 struct fb_info *info;
 195                 int ret;
 196
 197                 info = helper->fbdev;
 198                 ret = unregister_framebuffer(info);
 199                 if (ret < 0)
 200                         DRM_DEBUG_KMS("failed unregister_framebuffer() - %d\n",
 201                                       ret);
 202
 203                 if (info->cmap.len)
 204                         fb_dealloc_cmap(&info->cmap);
 205
 206                 framebuffer_release(info);
 207         }
 208
 209         if (helper->fb)
 210                 drm_framebuffer_unreference(helper->fb);
 211
 212         drm_fb_helper_fini(helper);
 213 }