drivers/video/vesa_fb.c

   1 /*
   2  * VESA frame buffer driver
   3  *
   4  * Copyright (C) 2014 Google, Inc
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <pci_rom.h>
  11 #include <video_fb.h>
  12 #include <vbe.h>
  13
  14 /*
  15  * The Graphic Device
  16  */
  17 GraphicDevice ctfb;
  18
  19 void *video_hw_init(void)
  20 {
  21         GraphicDevice *gdev = &ctfb;
  22         int bits_per_pixel;
  23         pci_dev_t dev;
  24         int ret;
  25
  26         printf("Video: ");
  27         if (!ll_boot_init()) {
  28                 /*
  29                  * If we are running from EFI or coreboot, this driver can't
  30                  * work.
  31                  */
  32                 printf("Not available (previous bootloader prevents it)\n");
  33                 return NULL;
  34         }
  35         if (vbe_get_video_info(gdev)) {
  36                 dev = pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, 0);
  37                 if (dev == -1) {
  38                         printf("no card detected\n");
  39                         return NULL;
  40                 }
  41                 bootstage_start(BOOTSTAGE_ID_ACCUM_LCD, "vesa display");
  42                 ret = pci_run_vga_bios(dev, NULL, PCI_ROM_USE_NATIVE |
  43                                        PCI_ROM_ALLOW_FALLBACK);
  44                 bootstage_accum(BOOTSTAGE_ID_ACCUM_LCD);
  45                 if (ret) {
  46                         printf("failed to run video BIOS: %d\n", ret);
  47                         return NULL;
  48                 }
  49         }
  50
  51         if (vbe_get_video_info(gdev)) {
  52                 printf("No video mode configured\n");
  53                 return NULL;
  54         }
  55
  56         bits_per_pixel = gdev->gdfBytesPP * 8;
  57         sprintf(gdev->modeIdent, "%dx%dx%d", gdev->winSizeX, gdev->winSizeY,
  58                 bits_per_pixel);
  59         printf("%s\n", gdev->modeIdent);
  60         debug("Frame buffer at %x\n", gdev->pciBase);
  61
  62         return (void *)gdev;
  63 }