dm: video: Add an EFI framebuffer driver
This adds a DM video driver for U-Boot as the EFI payload. The driver
makes use of all necessary information from the passed EFI GOP info
to create a linear framebuffer device, as if it were initialized by
U-Boot itself.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
diff --git a/drivers/video/efi.c b/drivers/video/efi.c
new file mode 100644
index 0000000..653cb47
--- /dev/null
+++ b/drivers/video/efi.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * EFI framebuffer driver based on GOP
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <efi_api.h>
+#include <vbe.h>
+#include <video.h>
+
+struct pixel {
+ u8 pos;
+ u8 size;
+};
+
+static const struct efi_framebuffer {
+ struct pixel red;
+ struct pixel green;
+ struct pixel blue;
+ struct pixel rsvd;
+} efi_framebuffer_format_map[] = {
+ [EFI_GOT_RGBA8] = { {0, 8}, {8, 8}, {16, 8}, {24, 8} },
+ [EFI_GOT_BGRA8] = { {16, 8}, {8, 8}, {0, 8}, {24, 8} },
+};
+
+static void efi_find_pixel_bits(u32 mask, u8 *pos, u8 *size)
+{
+ u8 first, len;
+
+ first = 0;
+ len = 0;
+
+ if (mask) {
+ while (!(mask & 0x1)) {
+ mask = mask >> 1;
+ first++;
+ }
+
+ while (mask & 0x1) {
+ mask = mask >> 1;
+ len++;
+ }
+ }
+
+ *pos = first;
+ *size = len;
+}
+
+static int save_vesa_mode(struct vesa_mode_info *vesa)
+{
+ struct efi_entry_gopmode *mode;
+ const struct efi_framebuffer *fbinfo;
+ int size;
+ int ret;
+
+ ret = efi_info_get(EFIET_GOP_MODE, (void **)&mode, &size);
+ if (ret == -ENOENT) {
+ debug("efi graphics output protocol mode not found\n");
+ return -ENXIO;
+ }
+
+ vesa->phys_base_ptr = mode->fb_base;
+ vesa->x_resolution = mode->info->width;
+ vesa->y_resolution = mode->info->height;
+
+ if (mode->info->pixel_format < EFI_GOT_BITMASK) {
+ fbinfo = &efi_framebuffer_format_map[mode->info->pixel_format];
+ vesa->red_mask_size = fbinfo->red.size;
+ vesa->red_mask_pos = fbinfo->red.pos;
+ vesa->green_mask_size = fbinfo->green.size;
+ vesa->green_mask_pos = fbinfo->green.pos;
+ vesa->blue_mask_size = fbinfo->blue.size;
+ vesa->blue_mask_pos = fbinfo->blue.pos;
+ vesa->reserved_mask_size = fbinfo->rsvd.size;
+ vesa->reserved_mask_pos = fbinfo->rsvd.pos;
+
+ vesa->bits_per_pixel = 32;
+ vesa->bytes_per_scanline = mode->info->pixels_per_scanline * 4;
+ } else if (mode->info->pixel_format == EFI_GOT_BITMASK) {
+ efi_find_pixel_bits(mode->info->pixel_bitmask[0],
+ &vesa->red_mask_pos,
+ &vesa->red_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[1],
+ &vesa->green_mask_pos,
+ &vesa->green_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[2],
+ &vesa->blue_mask_pos,
+ &vesa->blue_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[3],
+ &vesa->reserved_mask_pos,
+ &vesa->reserved_mask_size);
+ vesa->bits_per_pixel = vesa->red_mask_size +
+ vesa->green_mask_size +
+ vesa->blue_mask_size +
+ vesa->reserved_mask_size;
+ vesa->bytes_per_scanline = (mode->info->pixels_per_scanline *
+ vesa->bits_per_pixel) / 8;
+ } else {
+ debug("efi set unknown framebuffer format: %d\n",
+ mode->info->pixel_format);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int efi_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 vesa_mode_info *vesa = &mode_info.vesa;
+ int ret;
+
+ /* Initialize vesa_mode_info structure */
+ ret = save_vesa_mode(vesa);
+ if (ret)
+ goto err;
+
+ ret = vbe_setup_video_priv(vesa, uc_priv, plat);
+ if (ret)
+ goto err;
+
+ printf("Video: %dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
+ vesa->bits_per_pixel);
+
+ return 0;
+
+err:
+ printf("No video mode configured in EFI!\n");
+ return ret;
+}
+
+static const struct udevice_id efi_video_ids[] = {
+ { .compatible = "efi-fb" },
+ { }
+};
+
+U_BOOT_DRIVER(efi_video) = {
+ .name = "efi_video",
+ .id = UCLASS_VIDEO,
+ .of_match = efi_video_ids,
+ .probe = efi_video_probe,
+};