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
Reviewed-by: Anatolij Gustschin
---
Changes in v2: None
drivers/video/Kconfig | 9 +++
drivers/video/Makefile | 1 +
drivers/video/efi.c| 146 +
3 files changed, 156 insertions(+)
create mode 100644 drivers/video/efi.c
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4c4d286..5ee9032 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -156,6 +156,15 @@ config VIDEO_COREBOOT
coreboot already. This can in principle be used with any platform
that coreboot supports.
+config VIDEO_EFI
+ bool "Enable EFI framebuffer driver support"
+ depends on EFI_STUB
+ help
+ Turn on this option to enable a framebuffeer driver when U-Boot is
+ loaded as a payload (see README.u-boot_on_efi) by an EFI BIOS where
+ the graphics device is configured by the EFI BIOS already. This can
+ in principle be used with any platform that has an EFI BIOS.
+
config VIDEO_VESA
bool "Enable VESA video driver support"
default n
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index cf7ad28..7c89c67 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_LD9040) += ld9040.o
obj-$(CONFIG_VIDEO_BCM2835) += bcm2835.o
obj-$(CONFIG_VIDEO_COREBOOT) += coreboot.o
obj-$(CONFIG_VIDEO_DA8XX) += da8xx-fb.o videomodes.o
+obj-$(CONFIG_VIDEO_EFI) += efi.o
obj-$(CONFIG_VIDEO_LCD_ANX9804) += anx9804.o
obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
obj-$(CONFIG_VIDEO_LCD_SSD2828) += ssd2828.o
diff --git a/drivers/video/efi.c b/drivers/video/efi.c
new file mode 100644
index 000..653cb47
--- /dev/null
+++ b/drivers/video/efi.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng
+ *
+ * EFI framebuffer driver based on GOP
+ */
+
+#include
+#include
+#include
+#include
+#include
+
+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 **), );
+ 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 = _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],
+ >red_mask_pos,
+ >red_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[1],
+ >green_mask_pos,
+ >green_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[2],
+ >blue_mask_pos,
+ >blue_mask_size);
+ efi_find_pixel_bits(mode->info->pixel_bitmask[3],
+
