drivers/video/efi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
   4  *
   5  * EFI framebuffer driver based on GOP
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <efi_api.h>
  11 #include <log.h>
  12 #include <vbe.h>
  13 #include <video.h>
  14
  15 struct pixel {
  16         u8 pos;
  17         u8 size;
  18 };
  19
  20 static const struct efi_framebuffer {
  21         struct pixel red;
  22         struct pixel green;
  23         struct pixel blue;
  24         struct pixel rsvd;
  25 } efi_framebuffer_format_map[] = {
  26         [EFI_GOT_RGBA8] = { {0, 8}, {8, 8}, {16, 8}, {24, 8} },
  27         [EFI_GOT_BGRA8] = { {16, 8}, {8, 8}, {0, 8}, {24, 8} },
  28 };
  29
  30 static void efi_find_pixel_bits(u32 mask, u8 *pos, u8 *size)
  31 {
  32         u8 first, len;
  33
  34         first = 0;
  35         len = 0;
  36
  37         if (mask) {
  38                 while (!(mask & 0x1)) {
  39                         mask = mask >> 1;
  40                         first++;
  41                 }
  42
  43                 while (mask & 0x1) {
  44                         mask = mask >> 1;
  45                         len++;
  46                 }
  47         }
  48
  49         *pos = first;
  50         *size = len;
  51 }
  52
  53 static int get_mode_info(struct vesa_mode_info *vesa)
  54 {
  55         efi_guid_t efi_gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
  56         struct efi_boot_services *boot = efi_get_boot();
  57         struct efi_gop_mode *mode;
  58         struct efi_gop *gop;
  59         int ret;
  60
  61         if (!boot)
  62                 return log_msg_ret("sys", -ENOSYS);
  63         ret = boot->locate_protocol(&efi_gop_guid, NULL, (void **)&gop);
  64         if (ret)
  65                 return log_msg_ret("prot", -ENOTSUPP);
  66
  67         mode = gop->mode;
  68         vesa->phys_base_ptr = mode->fb_base;
  69         vesa->x_resolution = mode->info->width;
  70         vesa->y_resolution = mode->info->height;
  71
  72         return 0;
  73 }
  74
  75 static int save_vesa_mode(struct vesa_mode_info *vesa)
  76 {
  77         struct efi_entry_gopmode *mode;
  78         const struct efi_framebuffer *fbinfo;
  79         int size;
  80         int ret;
  81
  82         if (IS_ENABLED(CONFIG_EFI_APP)) {
  83                 ret = get_mode_info(vesa);
  84                 if (ret) {
  85                         printf("EFI graphics output protocol not found\n");
  86                         return -ENXIO;
  87                 }
  88         } else {
  89                 ret = efi_info_get(EFIET_GOP_MODE, (void **)&mode, &size);
  90                 if (ret == -ENOENT) {
  91                         printf("EFI graphics output protocol mode not found\n");
  92                         return -ENXIO;
  93                 }
  94                 vesa->phys_base_ptr = mode->fb_base;
  95                 vesa->x_resolution = mode->info->width;
  96                 vesa->y_resolution = mode->info->height;
  97         }
  98
  99         if (mode->info->pixel_format < EFI_GOT_BITMASK) {
 100                 fbinfo = &efi_framebuffer_format_map[mode->info->pixel_format];
 101                 vesa->red_mask_size = fbinfo->red.size;
 102                 vesa->red_mask_pos = fbinfo->red.pos;
 103                 vesa->green_mask_size = fbinfo->green.size;
 104                 vesa->green_mask_pos = fbinfo->green.pos;
 105                 vesa->blue_mask_size = fbinfo->blue.size;
 106                 vesa->blue_mask_pos = fbinfo->blue.pos;
 107                 vesa->reserved_mask_size = fbinfo->rsvd.size;
 108                 vesa->reserved_mask_pos = fbinfo->rsvd.pos;
 109
 110                 vesa->bits_per_pixel = 32;
 111                 vesa->bytes_per_scanline = mode->info->pixels_per_scanline * 4;
 112         } else if (mode->info->pixel_format == EFI_GOT_BITMASK) {
 113                 efi_find_pixel_bits(mode->info->pixel_bitmask[0],
 114                                     &vesa->red_mask_pos,
 115                                     &vesa->red_mask_size);
 116                 efi_find_pixel_bits(mode->info->pixel_bitmask[1],
 117                                     &vesa->green_mask_pos,
 118                                     &vesa->green_mask_size);
 119                 efi_find_pixel_bits(mode->info->pixel_bitmask[2],
 120                                     &vesa->blue_mask_pos,
 121                                     &vesa->blue_mask_size);
 122                 efi_find_pixel_bits(mode->info->pixel_bitmask[3],
 123                                     &vesa->reserved_mask_pos,
 124                                     &vesa->reserved_mask_size);
 125                 vesa->bits_per_pixel = vesa->red_mask_size +
 126                                        vesa->green_mask_size +
 127                                        vesa->blue_mask_size +
 128                                        vesa->reserved_mask_size;
 129                 vesa->bytes_per_scanline = (mode->info->pixels_per_scanline *
 130                                             vesa->bits_per_pixel) / 8;
 131         } else {
 132                 debug("efi set unknown framebuffer format: %d\n",
 133                       mode->info->pixel_format);
 134                 return -EINVAL;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int efi_video_probe(struct udevice *dev)
 141 {
 142         struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 143         struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 144         struct vesa_mode_info *vesa = &mode_info.vesa;
 145         int ret;
 146
 147         /* Initialize vesa_mode_info structure */
 148         ret = save_vesa_mode(vesa);
 149         if (ret)
 150                 goto err;
 151
 152         ret = vbe_setup_video_priv(vesa, uc_priv, plat);
 153         if (ret)
 154                 goto err;
 155
 156         printf("Video: %dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
 157                vesa->bits_per_pixel);
 158
 159         return 0;
 160
 161 err:
 162         printf("No video mode configured in EFI!\n");
 163         return ret;
 164 }
 165
 166 static const struct udevice_id efi_video_ids[] = {
 167         { .compatible = "efi-fb" },
 168         { }
 169 };
 170
 171 U_BOOT_DRIVER(efi_video) = {
 172         .name   = "efi_video",
 173         .id     = UCLASS_VIDEO,
 174         .of_match = efi_video_ids,
 175         .probe  = efi_video_probe,
 176 };