drivers/video/coreboot_fb.c

   1 /*
   2  * coreboot Framebuffer driver.
   3  *
   4  * Copyright (C) 2011 The Chromium OS authors
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <asm/arch/tables.h>
  11 #include <asm/arch/sysinfo.h>
  12 #include <video_fb.h>
  13 #include "videomodes.h"
  14
  15 /*
  16  * The Graphic Device
  17  */
  18 GraphicDevice ctfb;
  19
  20 static int parse_coreboot_table_fb(GraphicDevice *gdev)
  21 {
  22         struct cb_framebuffer *fb = lib_sysinfo.framebuffer;
  23
  24         /* If there is no framebuffer structure, bail out and keep
  25          * running on the serial console.
  26          */
  27         if (!fb)
  28                 return 0;
  29
  30         gdev->winSizeX = fb->x_resolution;
  31         gdev->winSizeY = fb->y_resolution;
  32
  33         gdev->plnSizeX = fb->x_resolution;
  34         gdev->plnSizeY = fb->y_resolution;
  35
  36         gdev->gdfBytesPP = fb->bits_per_pixel / 8;
  37
  38         switch (fb->bits_per_pixel) {
  39         case 24:
  40                 gdev->gdfIndex = GDF_32BIT_X888RGB;
  41                 break;
  42         case 16:
  43                 gdev->gdfIndex = GDF_16BIT_565RGB;
  44                 break;
  45         default:
  46                 gdev->gdfIndex = GDF__8BIT_INDEX;
  47                 break;
  48         }
  49
  50         gdev->isaBase = CONFIG_SYS_ISA_IO_BASE_ADDRESS;
  51         gdev->pciBase = (unsigned int)fb->physical_address;
  52
  53         gdev->frameAdrs = (unsigned int)fb->physical_address;
  54         gdev->memSize = fb->bytes_per_line * fb->y_resolution;
  55
  56         gdev->vprBase = (unsigned int)fb->physical_address;
  57         gdev->cprBase = (unsigned int)fb->physical_address;
  58
  59         return 1;
  60 }
  61
  62 void *video_hw_init(void)
  63 {
  64         GraphicDevice *gdev = &ctfb;
  65         int bits_per_pixel;
  66
  67         printf("Video: ");
  68
  69         if (!parse_coreboot_table_fb(gdev)) {
  70                 printf("No video mode configured in coreboot!\n");
  71                 return NULL;
  72         }
  73
  74         bits_per_pixel = gdev->gdfBytesPP * 8;
  75
  76         /* fill in Graphic device struct */
  77         sprintf(gdev->modeIdent, "%dx%dx%d", gdev->winSizeX, gdev->winSizeY,
  78                  bits_per_pixel);
  79         printf("%s\n", gdev->modeIdent);
  80
  81         memset((void *)gdev->pciBase, 0,
  82                 gdev->winSizeX * gdev->winSizeY * gdev->gdfBytesPP);
  83
  84         return (void *)gdev;
  85 }