dm: video: Add driver for coreboot framebuffer device

This adds a DM driver for coreboot framebuffer device.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/video/Kconfig

@@ -101,6 +101,15 @@ config VIDCONSOLE_AS_LCD
 	  to update the environment, the breakage may be confusing for users.
 	  This option will be removed around the end of 2016.
 
+config VIDEO_COREBOOT
+	bool "Enable coreboot framebuffer driver support"
+	depends on X86 && SYS_COREBOOT
+	help
+	  Turn on this option to enable a framebuffer driver when U-Boot is
+	  loaded by coreboot where the graphics device is configured by
+	  coreboot already. This can in principle be used with any platform
+	  that coreboot supports.
+
 config VIDEO_VESA
 	bool "Enable VESA video driver support"
 	default n

drivers/video/coreboot.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <vbe.h>
+#include <video.h>
+#include <asm/arch/sysinfo.h>
+
+static int save_vesa_mode(struct cb_framebuffer *fb,
+			  struct vesa_mode_info *vesa)
+{
+	/*
+	 * If there is no framebuffer structure, bail out and keep
+	 * running on the serial console.
+	 */
+	if (!fb)
+		return -ENXIO;
+
+	vesa->x_resolution = fb->x_resolution;
+	vesa->y_resolution = fb->y_resolution;
+	vesa->bits_per_pixel = fb->bits_per_pixel;
+	vesa->bytes_per_scanline = fb->bytes_per_line;
+	vesa->phys_base_ptr = fb->physical_address;
+	vesa->red_mask_size = fb->red_mask_size;
+	vesa->red_mask_pos = fb->red_mask_pos;
+	vesa->green_mask_size = fb->green_mask_size;
+	vesa->green_mask_pos = fb->green_mask_pos;
+	vesa->blue_mask_size = fb->blue_mask_size;
+	vesa->blue_mask_pos = fb->blue_mask_pos;
+	vesa->reserved_mask_size = fb->reserved_mask_size;
+	vesa->reserved_mask_pos = fb->reserved_mask_pos;
+
+	return 0;
+}
+
+static int coreboot_video_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct cb_framebuffer *fb = lib_sysinfo.framebuffer;
+	struct vesa_mode_info *vesa = &mode_info.vesa;
+	int ret;
+
+	printf("Video: ");
+
+	/* Initialize vesa_mode_info structure */
+	ret = save_vesa_mode(fb, vesa);
+	if (ret)
+		goto err;
+
+	ret = vbe_setup_video_priv(vesa, uc_priv, plat);
+	if (ret)
+		goto err;
+
+	printf("%dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
+	       vesa->bits_per_pixel);
+
+	return 0;
+
+err:
+	printf("No video mode configured in coreboot!\n");
+	return ret;
+}
+
+static const struct udevice_id coreboot_video_ids[] = {
+	{ .compatible = "coreboot-fb" },
+	{ }
+};
+
+U_BOOT_DRIVER(coreboot_video) = {
+	.name	= "coreboot_video",
+	.id	= UCLASS_VIDEO,
+	.of_match = coreboot_video_ids,
+	.probe	= coreboot_video_probe,
+};