mirror of
https://github.com/AsahiLinux/u-boot
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d8063dc373
Add a block driver which handles read/write for EFI block devices. This
driver actually already exists ('efi_block') but is not really suitable
for use as a real U-Boot driver:
- The operations do not provide a udevice
- The code is designed for running as part of EFI loader, so uses
EFI_PRINT() and EFI_CALL().
- The bind method probes the device, which is not permitted
- It uses 'EFI' as its parent device
The new driver is more 'normal', just requiring its platform data be set
up in advance.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Block driver for EFI devices
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* This supports a media driver of UCLASS_EFI with a child UCLASS_BLK
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* It allows block-level access to EFI devices made available via EFI boot
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* services
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*
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* Copyright 2021 Google LLC
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*/
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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <efi.h>
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#include <efi_api.h>
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struct efi_block_plat {
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struct efi_block_io *blkio;
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};
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/**
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* Read from block device
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*
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* @dev: device
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* @blknr: first block to be read
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* @blkcnt: number of blocks to read
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* @buffer: output buffer
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* Return: number of blocks transferred
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*/
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static ulong efi_bl_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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void *buffer)
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{
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struct efi_block_plat *plat = dev_get_plat(dev);
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struct efi_block_io *io = plat->blkio;
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efi_status_t ret;
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log_debug("read buf=%p, block=%lx, count=%lx: ", buffer, (ulong)blknr,
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(ulong)blkcnt);
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ret = io->read_blocks(io, io->media->media_id, blknr,
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blkcnt * io->media->block_size, buffer);
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log_debug("ret=%lx (dec %ld)\n", ret & ~EFI_ERROR_MASK,
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ret & ~EFI_ERROR_MASK);
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if (ret)
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return 0;
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return blkcnt;
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}
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/**
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* Write to block device
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*
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* @dev: device
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* @blknr: first block to be write
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* @blkcnt: number of blocks to write
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* @buffer: input buffer
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* Return: number of blocks transferred
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*/
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static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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const void *buffer)
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{
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struct efi_block_plat *plat = dev_get_plat(dev);
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struct efi_block_io *io = plat->blkio;
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efi_status_t ret;
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log_debug("write buf=%p, block=%lx, count=%lx: ", buffer, (ulong)blknr,
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(ulong)blkcnt);
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ret = io->write_blocks(io, io->media->media_id, blknr,
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blkcnt * io->media->block_size, (void *)buffer);
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log_debug("ret=%lx (dec %ld)\n", ret & ~EFI_ERROR_MASK,
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ret & ~EFI_ERROR_MASK);
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if (ret)
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return 0;
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return blkcnt;
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}
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/* Block device driver operators */
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static const struct blk_ops efi_blk_ops = {
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.read = efi_bl_read,
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.write = efi_bl_write,
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};
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U_BOOT_DRIVER(efi_block) = {
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.name = "efi_block",
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.id = UCLASS_BLK,
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.ops = &efi_blk_ops,
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.plat_auto = sizeof(struct efi_block_plat),
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};
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static int efi_media_bind(struct udevice *dev)
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{
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struct efi_media_plat *plat = dev_get_plat(dev);
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struct efi_block_plat *blk_plat;
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struct udevice *blk;
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int ret;
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ret = blk_create_devicef(dev, "efi_block", "blk", IF_TYPE_EFI_MEDIA,
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dev_seq(dev), plat->blkio->media->block_size,
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plat->blkio->media->last_block, &blk);
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if (ret) {
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debug("Cannot create block device\n");
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return ret;
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}
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blk_plat = dev_get_plat(blk);
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blk_plat->blkio = plat->blkio;
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return 0;
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}
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U_BOOT_DRIVER(efi_media) = {
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.name = "efi_media",
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.id = UCLASS_EFI_MEDIA,
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.bind = efi_media_bind,
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.plat_auto = sizeof(struct efi_media_plat),
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};
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