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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2011 Intel Corporation; author Matt Fleming
* Copyright (c) 2017 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*/
#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-payload.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 *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)
goto free_modes;
priv->dev->priv = &priv->fb;
if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE)) {
struct console_device *cdev;
cdev = console_get_by_dev(&priv->fb.dev);
if (cdev)
dev_add_param_fixed(&cdev->class_dev, "linux.bootargs.earlycon",
"earlycon=efifb");
}
return 0;
free_modes:
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);
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