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/* This file is part of the coreboot project. */
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <boot/coreboot_tables.h>
#include <console/console.h>
#include <fsp/util.h>
#include <soc/intel/common/vbt.h>
#include <types.h>
enum pixel_format {
pixel_rgbx_8bpc = 0,
pixel_bgrx_8bpc = 1,
pixel_bitmask = 2, /* defined by <rgb>_mask values */
};
static const uint8_t fsp_graphics_info_guid[16] = {
0xce, 0x2c, 0xf6, 0x39, 0x25, 0x68, 0x69, 0x46,
0xbb, 0x56, 0x54, 0x1a, 0xba, 0x75, 0x3a, 0x07
};
struct hob_graphics_info {
uint64_t framebuffer_base;
uint32_t framebuffer_size;
uint32_t version;
uint32_t horizontal_resolution;
uint32_t vertical_resolution;
uint32_t pixel_format; /* See enum pixel_format */
uint32_t red_mask;
uint32_t green_mask;
uint32_t blue_mask;
uint32_t reserved_mask;
uint32_t pixels_per_scanline;
} __packed;
struct pixel {
uint8_t pos;
uint8_t size;
};
static const struct fsp_framebuffer {
struct pixel red;
struct pixel green;
struct pixel blue;
struct pixel rsvd;
} fsp_framebuffer_format_map[] = {
[pixel_rgbx_8bpc] = { {0, 8}, {8, 8}, {16, 8}, {24, 8} },
[pixel_bgrx_8bpc] = { {16, 8}, {8, 8}, {0, 8}, {24, 8} },
};
enum cb_err fsp_fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
{
size_t size;
const struct hob_graphics_info *ginfo;
const struct fsp_framebuffer *fbinfo;
ginfo = fsp_find_extension_hob_by_guid(fsp_graphics_info_guid, &size);
if (!ginfo) {
printk(BIOS_ALERT, "Graphics hand-off block not found\n");
return CB_ERR;
}
if (ginfo->pixel_format >= ARRAY_SIZE(fsp_framebuffer_format_map)) {
printk(BIOS_ALERT, "FSP set unknown framebuffer format: %d\n",
ginfo->pixel_format);
return CB_ERR;
}
fbinfo = fsp_framebuffer_format_map + ginfo->pixel_format;
framebuffer->physical_address = ginfo->framebuffer_base;
framebuffer->x_resolution = ginfo->horizontal_resolution;
framebuffer->y_resolution = ginfo->vertical_resolution;
framebuffer->bytes_per_line = ginfo->pixels_per_scanline * 4;
framebuffer->bits_per_pixel = 32;
framebuffer->red_mask_pos = fbinfo->red.pos;
framebuffer->red_mask_size = fbinfo->red.size;
framebuffer->green_mask_pos = fbinfo->green.pos;
framebuffer->green_mask_size = fbinfo->green.size;
framebuffer->blue_mask_pos = fbinfo->blue.pos;
framebuffer->blue_mask_size = fbinfo->blue.size;
framebuffer->reserved_mask_pos = fbinfo->rsvd.pos;
framebuffer->reserved_mask_size = fbinfo->rsvd.pos;
return CB_SUCCESS;
}
int fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
{
enum cb_err ret;
uintptr_t framebuffer_bar;
/* Pci enumeration happens after silicon init.
* After enumeration graphic framebuffer base may be relocated.
* Get framebuffer base from soc.
*/
framebuffer_bar = fsp_soc_get_igd_bar();
if (!framebuffer_bar) {
printk(BIOS_ALERT, "Framebuffer BAR invalid\n");
return -1;
}
ret = fsp_fill_lb_framebuffer(framebuffer);
if (ret != CB_SUCCESS) {
printk(BIOS_ALERT, "FSP did not return a valid framebuffer\n");
return -1;
}
/* Resource allocator can move the BAR around after FSP configures it */
framebuffer->physical_address = framebuffer_bar;
printk(BIOS_DEBUG, "Graphics framebuffer located at 0x%llx\n",
framebuffer->physical_address);
return 0;
}
__weak uintptr_t fsp_soc_get_igd_bar(void)
{
return 0;
}
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