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>

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index fd26690..86db0da 100644 (file)
--- a/drivers/video/Kconfig
+++ b/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

diff --git a/drivers/video/coreboot.c b/drivers/video/coreboot.c
new file mode 100644 (file)
index 0000000..3a94aa1
--- /dev/null
+++ b/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,
+};