efi_loader: Add GOP support

The EFI standard defines a simple boot protocol that an EFI payload can use
to access video output.

This patch adds support to expose exactly that one (and the mode already in
use) as possible graphical configuration to an EFI payload.

With this, I can successfully run grub2 with graphical output.

Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 153 insertions, 0 deletions

diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 28725a2..83e31f6 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -9,4 +9,5 @@
 
 obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
 obj-y += efi_memory.o
+obj-$(CONFIG_LCD) += efi_gop.o
 obj-$(CONFIG_PARTITIONS) += efi_disk.o
diff --git a/lib/efi_loader/efi_gop.c b/lib/efi_loader/efi_gop.c
new file mode 100644
index 0000000..bdd62bc
--- /dev/null
+++ b/lib/efi_loader/efi_gop.c
@@ -0,0 +1,152 @@
+/*
+ *  EFI application disk support
+ *
+ *  Copyright (c) 2016 Alexander Graf
+ *
+ *  SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <inttypes.h>
+#include <lcd.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const efi_guid_t efi_gop_guid = EFI_GOP_GUID;
+
+struct efi_gop_obj {
+	/* Generic EFI object parent class data */
+	struct efi_object parent;
+	/* EFI Interface callback struct for gop */
+	struct efi_gop ops;
+	/* The only mode we support */
+	struct efi_gop_mode_info info;
+	struct efi_gop_mode mode;
+};
+
+static efi_status_t EFIAPI gop_query_mode(struct efi_gop *this, u32 mode_number,
+					  unsigned long *size_of_info,
+					  struct efi_gop_mode_info **info)
+{
+	struct efi_gop_obj *gopobj;
+
+	EFI_ENTRY("%p, %x, %p, %p", this, mode_number, size_of_info, info);
+
+	gopobj = container_of(this, struct efi_gop_obj, ops);
+	*size_of_info = sizeof(gopobj->info);
+	*info = &gopobj->info;
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+static efi_status_t EFIAPI gop_set_mode(struct efi_gop *this, u32 mode_number)
+{
+	EFI_ENTRY("%p, %x", this, mode_number);
+
+	if (mode_number != 0)
+		return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+static efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
+				   unsigned long operation, unsigned long sx,
+				   unsigned long sy, unsigned long dx,
+				   unsigned long dy, unsigned long width,
+				   unsigned long height, unsigned long delta)
+{
+	int i, j, line_len16, line_len32;
+	void *fb;
+
+	EFI_ENTRY("%p, %p, %lx, %lx, %lx, %lx, %lx, %lx, %lx, %lx", this,
+		  buffer, operation, sx, sy, dx, dy, width, height, delta);
+
+	if (operation != EFI_BLT_BUFFER_TO_VIDEO)
+		return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+	fb = (void*)gd->fb_base;
+	line_len16 = panel_info.vl_col * sizeof(u16);
+	line_len32 = panel_info.vl_col * sizeof(u32);
+
+	/* Copy the contents line by line */
+
+	switch (panel_info.vl_bpix) {
+	case LCD_COLOR32:
+		for (i = 0; i < height; i++) {
+			u32 *dest = fb + ((i + dy)  * line_len32) +
+					 (dx * sizeof(u32));
+			u32 *src = buffer + ((i + sy)  * line_len32) +
+					 (sx * sizeof(u32));
+
+			/* Same color format, just memcpy */
+			memcpy(dest, src, width * sizeof(u32));
+		}
+		break;
+	case LCD_COLOR16:
+		for (i = 0; i < height; i++) {
+			u16 *dest = fb + ((i + dy)  * line_len16) +
+					 (dx * sizeof(u16));
+			u32 *src = buffer + ((i + sy)  * line_len32) +
+					 (sx * sizeof(u32));
+
+			/* Convert from rgb888 to rgb565 */
+			for (j = 0; j < width; j++) {
+				u32 rgb888 = src[j];
+				dest[j] = ((((rgb888 >> (16 + 3)) & 0x1f) << 11) |
+					   (((rgb888 >> (8 + 2)) & 0x3f) << 5) |
+					   (((rgb888 >> (0 + 3)) & 0x1f) << 0));
+			}
+		}
+		break;
+	}
+
+	lcd_sync();
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+/* This gets called from do_bootefi_exec(). */
+int efi_gop_register(void)
+{
+	struct efi_gop_obj *gopobj;
+	int line_len;
+
+	switch (panel_info.vl_bpix) {
+	case LCD_COLOR32:
+	case LCD_COLOR16:
+		break;
+	default:
+		/* So far, we only work in 16 or 32 bit mode */
+		return -1;
+	}
+
+	gopobj = calloc(1, sizeof(*gopobj));
+
+	/* Fill in object data */
+	gopobj->parent.protocols[0].guid = &efi_gop_guid;
+	gopobj->parent.protocols[0].open = efi_return_handle;
+	gopobj->parent.handle = &gopobj->ops;
+	gopobj->ops.query_mode = gop_query_mode;
+	gopobj->ops.set_mode = gop_set_mode;
+	gopobj->ops.blt = gop_blt;
+	gopobj->ops.mode = &gopobj->mode;
+
+	gopobj->mode.max_mode = 1;
+	gopobj->mode.info = &gopobj->info;
+	gopobj->mode.info_size = sizeof(gopobj->info);
+	gopobj->mode.fb_base = gd->fb_base;
+	gopobj->mode.fb_size = lcd_get_size(&line_len);
+
+	gopobj->info.version = 0;
+	gopobj->info.width = panel_info.vl_col;
+	gopobj->info.height = panel_info.vl_row;
+	gopobj->info.pixel_format = EFI_GOT_RGBA8;
+	gopobj->info.pixels_per_scanline = panel_info.vl_col;
+
+	/* Hook up to the device list */
+	list_add_tail(&gopobj->parent.link, &efi_obj_list);
+
+	return 0;
+}