x86: Add a VESA video driver

Add a driver intended to cope with any VESA-compatible x86 graphics
adapter. It will not support ROMs which use OpenFirmware (Forth) since
there is no support for that in U-Boot. This means that MAC OS cards
will not work.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/video/Kconfig

+config VIDEO_VESA
+	bool "Enable VESA video driver support"
+	depends on X86
+	default n
+	help
+	  Turn on this option to enable a very simple driver which uses vesa
+	  to discover the video mode and then provides a frame buffer for use
+	  by U-Boot. This can in principle be used with any platform that
+	  supports PCI and video cards that support VESA BIOS Extension (VBE).
+
 config VIDEO_X86
 	bool "Enable x86 video driver support"
 	depends on X86

drivers/video/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o
 obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o videomodes.o
 obj-$(CONFIG_VIDEO_TEGRA) += tegra.o
 obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
+obj-$(CONFIG_VIDEO_VESA) += vesa_fb.o
 obj-$(CONFIG_VIDEO_X86) += x86_fb.o
 obj-$(CONFIG_FORMIKE) += formike.o
 obj-$(CONFIG_AM335X_LCD) += am335x-fb.o

drivers/video/vesa_fb.c

+/*
+ *
+ * Vesa frame buffer driver for x86
+ *
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci_rom.h>
+#include <video_fb.h>
+#include <vbe.h>
+
+/*
+ * The Graphic Device
+ */
+GraphicDevice ctfb;
+
+/* Devices to allow - only the last one works fully */
+struct pci_device_id vesa_video_ids[] = {
+	{ .vendor = 0x102b, .device = 0x0525 },
+	{ .vendor = 0x1002, .device = 0x5159 },
+	{ .vendor = 0x1002, .device = 0x4752 },
+	{ .vendor = 0x1002, .device = 0x5452 },
+	{},
+};
+
+void *video_hw_init(void)
+{
+	GraphicDevice *gdev = &ctfb;
+	int bits_per_pixel;
+	pci_dev_t dev;
+	int ret;
+
+	printf("Video: ");
+	if (vbe_get_video_info(gdev)) {
+		/* TODO: Should we look these up by class? */
+		dev = pci_find_devices(vesa_video_ids, 0);
+		if (dev == -1) {
+			printf("no card detected\n");
+			return NULL;
+		}
+		printf("bdf %x\n", dev);
+		ret = pci_run_vga_bios(dev, NULL, true);
+		if (ret) {
+			printf("failed to run video BIOS: %d\n", ret);
+			return NULL;
+		}
+	}
+
+	if (vbe_get_video_info(gdev)) {
+		printf("No video mode configured\n");
+		return NULL;
+	}
+
+	bits_per_pixel = gdev->gdfBytesPP * 8;
+	sprintf(gdev->modeIdent, "%dx%dx%d", gdev->winSizeX, gdev->winSizeY,
+		bits_per_pixel);
+	printf("%s\n", gdev->modeIdent);
+	debug("Framex buffer at %x\n", gdev->pciBase);
+
+	return (void *)gdev;
+}