[PATCH 1/2] video: add EFI Graphics Output Protocol support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 drivers/video/Kconfig   |   4 +
 drivers/video/Makefile  |   2 +
 drivers/video/efi_gop.c | 267 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 273 insertions(+)
 create mode 100644 drivers/video/efi_gop.c

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 8f31f5af7..8d50db6f6 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -24,6 +24,10 @@ config DRIVER_VIDEO_ATMEL_HLCD
 	bool "Atmel HLCDC framebuffer driver"
 	depends on ARCH_AT91
 
+config DRIVER_VIDEO_EFI_GOP
+	bool "EFI Graphics Output Protocol (GOP)"
+	depends on EFI_BOOTUP
+
 config DRIVER_VIDEO_IMX
 	bool "i.MX framebuffer driver"
 	depends on ARCH_IMX1 || ARCH_IMX21 || ARCH_IMX25 || ARCH_IMX27
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 1bf2e1f3c..97712182e 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -21,3 +21,5 @@ obj-$(CONFIG_DRIVER_VIDEO_OMAP) += omap.o
 obj-$(CONFIG_DRIVER_VIDEO_BCM283X) += bcm2835.o
 obj-$(CONFIG_DRIVER_VIDEO_SIMPLEFB) += simplefb.o
 obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += imx-ipu-v3/
+
+obj-$(CONFIG_DRIVER_VIDEO_EFI_GOP) += efi_gop.o
diff --git a/drivers/video/efi_gop.c b/drivers/video/efi_gop.c
new file mode 100644
index 000000000..ccb4af3d9
--- /dev/null
+++ b/drivers/video/efi_gop.c
@@ -0,0 +1,267 @@
+/*
+ * Copyright 2011 Intel Corporation; author Matt Fleming
+ * Copyright (c) 2017 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <init.h>
+#include <malloc.h>
+#include <fb.h>
+#include <errno.h>
+#include <gui/graphic_utils.h>
+#include <efi.h>
+#include <efi/efi.h>
+#include <efi/efi-device.h>
+
+#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR		0
+#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR		1
+#define PIXEL_BIT_MASK					2
+#define PIXEL_BLT_ONLY					3
+#define PIXEL_FORMAT_MAX				4
+
+struct efi_pixel_bitmask {
+	u32 red_mask;
+	u32 green_mask;
+	u32 blue_mask;
+	u32 reserved_mask;
+};
+
+struct efi_graphics_output_mode_info {
+	u32 version;
+	u32 horizontal_resolution;
+	u32 vertical_resolution;
+	int pixel_format;
+	struct efi_pixel_bitmask pixel_information;
+	u32 pixels_per_scan_line;
+};
+
+struct efi_graphics_output_protocol_mode {
+	uint32_t max_mode;
+	uint32_t mode;
+	struct efi_graphics_output_mode_info *info;
+	unsigned long size_of_info;
+	void *frame_buffer_base;
+	unsigned long frame_buffer_size;
+};
+
+struct efi_graphics_output_protocol {
+	efi_status_t (EFIAPI *query_mode) (struct efi_graphics_output_protocol *This,
+			uint32_t mode_number, unsigned long *size_of_info,
+			struct efi_graphics_output_mode_info **info);
+	efi_status_t (EFIAPI *set_mode) (struct efi_graphics_output_protocol *This,
+			uint32_t mode_number);
+	efi_status_t (EFIAPI *blt)(struct efi_graphics_output_protocol *This,
+			void *buffer,
+			unsigned long operation,
+			unsigned long sourcex, unsigned long sourcey,
+			unsigned long destinationx, unsigned long destinationy,
+			unsigned long width, unsigned long height, unsigned
+			long delta);
+	struct efi_graphics_output_protocol_mode *mode;
+};
+
+struct efi_gop_priv {
+	struct device_d *dev;
+	struct fb_info fb;
+
+	uint32_t mode;
+	struct efi_graphics_output_protocol *gop;
+};
+
+static void find_bits(unsigned long mask, u32 *pos, u32 *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 void setup_pixel_info(struct fb_info *fb, u32 pixels_per_scan_line,
+		 struct efi_pixel_bitmask pixel_info, int pixel_format)
+{
+	if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
+		fb->bits_per_pixel = 32;
+		fb->line_length = pixels_per_scan_line * 4;
+		fb->red.length = 8;
+		fb->red.offset = 0;
+		fb->green.length = 8;
+		fb->green.offset = 8;
+		fb->blue.length = 8;
+		fb->blue.offset = 16;
+		fb->transp.length = 8;
+		fb->transp.offset = 24;
+	} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
+		fb->bits_per_pixel = 32;
+		fb->line_length = pixels_per_scan_line * 4;
+		fb->red.length = 8;
+		fb->red.offset = 16;
+		fb->green.length = 8;
+		fb->green.offset = 8;
+		fb->blue.length = 8;
+		fb->blue.offset = 0;
+		fb->transp.length = 8;
+		fb->transp.offset = 24;
+	} else if (pixel_format == PIXEL_BIT_MASK) {
+		find_bits(pixel_info.red_mask, &fb->red.offset, &fb->red.length);
+		find_bits(pixel_info.green_mask, &fb->green.offset,
+			  &fb->green.length);
+		find_bits(pixel_info.blue_mask, &fb->blue.offset, &fb->blue.length);
+		find_bits(pixel_info.reserved_mask, &fb->transp.offset,
+			  &fb->transp.length);
+		fb->bits_per_pixel = fb->red.length + fb->green.length +
+			fb->blue.length + fb->transp.length;
+		fb->line_length = (pixels_per_scan_line * fb->bits_per_pixel) / 8;
+	} else {
+		fb->bits_per_pixel = 4;
+		fb->line_length = fb->xres / 2;
+		fb->red.length = 0;
+		fb->red.offset = 0;
+		fb->green.length = 0;
+		fb->green.offset = 0;
+		fb->blue.length = 0;
+		fb->blue.offset = 0;
+		fb->transp.length = 0;
+		fb->transp.offset = 0;
+	}
+}
+
+static int efi_gop_query(struct efi_gop_priv *priv)
+{
+	struct efi_graphics_output_protocol_mode *mode;
+	struct efi_graphics_output_mode_info *info;
+	efi_status_t efiret;
+	unsigned long size = 0;
+	int i;
+	struct fb_videomode *vmode;
+
+	mode = priv->gop->mode;
+	vmode = xzalloc(sizeof(*vmode) * mode->max_mode);
+
+	priv->fb.modes.num_modes = mode->max_mode;
+	priv->fb.modes.modes = vmode;
+
+	for (i = 0; i < mode->max_mode; i++, vmode++) {
+		efiret = priv->gop->query_mode(priv->gop, i, &size, &info);
+		if (EFI_ERROR(efiret))
+			continue;
+
+		vmode->name = basprintf("%d", i);
+		vmode->xres = info->horizontal_resolution;
+		vmode->yres = info->vertical_resolution;
+	}
+
+	priv->fb.screen_base = mode->frame_buffer_base;
+	priv->mode = mode->mode;
+	priv->fb.xres = priv->fb.mode->xres;
+	priv->fb.yres = priv->fb.mode->yres;
+
+	return 0;
+}
+
+static int efi_gop_fb_activate_var(struct fb_info *fb_info)
+{
+	struct efi_gop_priv *priv = fb_info->priv;
+	struct efi_graphics_output_mode_info *info;
+	int num;
+	unsigned long size = 0;
+	efi_status_t efiret;
+
+	num = simple_strtoul(fb_info->mode->name, NULL, 0);
+
+	if (priv->mode != num) {
+		efiret = priv->gop->set_mode(priv->gop, num);
+		if (EFI_ERROR(efiret))
+			return -efi_errno(efiret);
+		priv->mode = num;
+	}
+
+	efiret = priv->gop->query_mode(priv->gop, num, &size, &info);
+	if (EFI_ERROR(efiret))
+		return -efi_errno(efiret);
+
+	setup_pixel_info(&priv->fb, info->pixels_per_scan_line,
+			 info->pixel_information, info->pixel_format);
+
+	return 0;
+}
+
+static struct fb_ops efi_gop_ops = {
+	.fb_activate_var = efi_gop_fb_activate_var,
+};
+
+static int efi_gop_probe(struct efi_device *efidev)
+{
+	struct efi_gop_priv *priv;
+	int ret = 0;
+	efi_status_t efiret;
+	efi_guid_t got_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+	void *protocol;
+	
+	efiret = BS->handle_protocol(efidev->handle, &got_guid, &protocol);
+	if (EFI_ERROR(efiret))
+		return  -efi_errno(efiret);
+
+	priv = xzalloc(sizeof(struct efi_gop_priv));
+	priv->gop = protocol;
+	priv->dev = &efidev->dev;
+
+	if (!priv->gop) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	ret = efi_gop_query(priv);
+	if (ret)
+		goto err;
+
+	priv->fb.priv = priv;
+	priv->fb.dev.parent = priv->dev;
+	priv->fb.fbops = &efi_gop_ops;
+	priv->fb.p_enable = 1;
+	priv->fb.current_mode = priv->mode;
+
+	ret = register_framebuffer(&priv->fb);
+	if (!ret) {
+		priv->dev->priv = &priv->fb;
+		return 0;
+	}
+
+	if (priv->fb.modes.modes) {
+		int i;
+
+		for (i = 0; i < priv->fb.modes.num_modes; i++)
+			free((void*)priv->fb.modes.modes[i].name);
+
+		free((void*)priv->fb.modes.modes);
+	}
+err:
+	free(priv);
+        return ret;
+}
+
+static struct efi_driver efi_gop_driver = {
+        .driver = {
+		.name  = "efi-gop",
+	},
+        .probe = efi_gop_probe,
+	.guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID,
+};
+device_efi_driver(efi_gop_driver);
-- 
2.11.0


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