mirror of
https://github.com/AsahiLinux/u-boot
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147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* EFI framebuffer driver based on GOP
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*/
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#include <common.h>
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#include <dm.h>
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#include <efi_api.h>
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#include <log.h>
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#include <vbe.h>
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#include <video.h>
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struct pixel {
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u8 pos;
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u8 size;
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};
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static const struct efi_framebuffer {
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struct pixel red;
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struct pixel green;
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struct pixel blue;
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struct pixel rsvd;
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} efi_framebuffer_format_map[] = {
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[EFI_GOT_RGBA8] = { {0, 8}, {8, 8}, {16, 8}, {24, 8} },
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[EFI_GOT_BGRA8] = { {16, 8}, {8, 8}, {0, 8}, {24, 8} },
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};
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static void efi_find_pixel_bits(u32 mask, u8 *pos, u8 *size)
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{
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u8 first, len;
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first = 0;
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len = 0;
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if (mask) {
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while (!(mask & 0x1)) {
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mask = mask >> 1;
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first++;
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}
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while (mask & 0x1) {
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mask = mask >> 1;
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len++;
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}
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}
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*pos = first;
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*size = len;
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}
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static int save_vesa_mode(struct vesa_mode_info *vesa)
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{
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struct efi_entry_gopmode *mode;
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const struct efi_framebuffer *fbinfo;
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int size;
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int ret;
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ret = efi_info_get(EFIET_GOP_MODE, (void **)&mode, &size);
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if (ret == -ENOENT) {
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debug("efi graphics output protocol mode not found\n");
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return -ENXIO;
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}
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vesa->phys_base_ptr = mode->fb_base;
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vesa->x_resolution = mode->info->width;
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vesa->y_resolution = mode->info->height;
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if (mode->info->pixel_format < EFI_GOT_BITMASK) {
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fbinfo = &efi_framebuffer_format_map[mode->info->pixel_format];
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vesa->red_mask_size = fbinfo->red.size;
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vesa->red_mask_pos = fbinfo->red.pos;
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vesa->green_mask_size = fbinfo->green.size;
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vesa->green_mask_pos = fbinfo->green.pos;
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vesa->blue_mask_size = fbinfo->blue.size;
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vesa->blue_mask_pos = fbinfo->blue.pos;
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vesa->reserved_mask_size = fbinfo->rsvd.size;
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vesa->reserved_mask_pos = fbinfo->rsvd.pos;
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vesa->bits_per_pixel = 32;
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vesa->bytes_per_scanline = mode->info->pixels_per_scanline * 4;
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} else if (mode->info->pixel_format == EFI_GOT_BITMASK) {
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efi_find_pixel_bits(mode->info->pixel_bitmask[0],
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&vesa->red_mask_pos,
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&vesa->red_mask_size);
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efi_find_pixel_bits(mode->info->pixel_bitmask[1],
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&vesa->green_mask_pos,
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&vesa->green_mask_size);
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efi_find_pixel_bits(mode->info->pixel_bitmask[2],
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&vesa->blue_mask_pos,
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&vesa->blue_mask_size);
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efi_find_pixel_bits(mode->info->pixel_bitmask[3],
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&vesa->reserved_mask_pos,
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&vesa->reserved_mask_size);
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vesa->bits_per_pixel = vesa->red_mask_size +
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vesa->green_mask_size +
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vesa->blue_mask_size +
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vesa->reserved_mask_size;
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vesa->bytes_per_scanline = (mode->info->pixels_per_scanline *
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vesa->bits_per_pixel) / 8;
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} else {
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debug("efi set unknown framebuffer format: %d\n",
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mode->info->pixel_format);
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return -EINVAL;
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}
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return 0;
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}
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static int efi_video_probe(struct udevice *dev)
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{
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struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
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struct video_priv *uc_priv = dev_get_uclass_priv(dev);
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struct vesa_mode_info *vesa = &mode_info.vesa;
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int ret;
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/* Initialize vesa_mode_info structure */
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ret = save_vesa_mode(vesa);
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if (ret)
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goto err;
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ret = vbe_setup_video_priv(vesa, uc_priv, plat);
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if (ret)
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goto err;
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printf("Video: %dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
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vesa->bits_per_pixel);
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return 0;
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err:
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printf("No video mode configured in EFI!\n");
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return ret;
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}
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static const struct udevice_id efi_video_ids[] = {
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{ .compatible = "efi-fb" },
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{ }
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};
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U_BOOT_DRIVER(efi_video) = {
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.name = "efi_video",
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.id = UCLASS_VIDEO,
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.of_match = efi_video_ids,
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.probe = efi_video_probe,
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};
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