mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 23:33:00 +00:00
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+
|
|
/*
|
|
* Block driver for EFI devices
|
|
* This supports a media driver of UCLASS_EFI with a child UCLASS_BLK
|
|
* It allows block-level access to EFI devices made available via EFI boot
|
|
* services
|
|
*
|
|
* Copyright 2021 Google LLC
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <blk.h>
|
|
#include <dm.h>
|
|
#include <efi.h>
|
|
#include <efi_api.h>
|
|
|
|
struct efi_block_plat {
|
|
struct efi_block_io *blkio;
|
|
};
|
|
|
|
/**
|
|
* Read from block device
|
|
*
|
|
* @dev: device
|
|
* @blknr: first block to be read
|
|
* @blkcnt: number of blocks to read
|
|
* @buffer: output buffer
|
|
* Return: number of blocks transferred
|
|
*/
|
|
static ulong efi_bl_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
|
|
void *buffer)
|
|
{
|
|
struct efi_block_plat *plat = dev_get_plat(dev);
|
|
struct efi_block_io *io = plat->blkio;
|
|
efi_status_t ret;
|
|
|
|
log_debug("read buf=%p, block=%lx, count=%lx: ", buffer, (ulong)blknr,
|
|
(ulong)blkcnt);
|
|
ret = io->read_blocks(io, io->media->media_id, blknr,
|
|
blkcnt * io->media->block_size, buffer);
|
|
log_debug("ret=%lx (dec %ld)\n", ret & ~EFI_ERROR_MASK,
|
|
ret & ~EFI_ERROR_MASK);
|
|
if (ret)
|
|
return 0;
|
|
|
|
return blkcnt;
|
|
}
|
|
|
|
/**
|
|
* Write to block device
|
|
*
|
|
* @dev: device
|
|
* @blknr: first block to be write
|
|
* @blkcnt: number of blocks to write
|
|
* @buffer: input buffer
|
|
* Return: number of blocks transferred
|
|
*/
|
|
static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
|
|
const void *buffer)
|
|
{
|
|
struct efi_block_plat *plat = dev_get_plat(dev);
|
|
struct efi_block_io *io = plat->blkio;
|
|
efi_status_t ret;
|
|
|
|
log_debug("write buf=%p, block=%lx, count=%lx: ", buffer, (ulong)blknr,
|
|
(ulong)blkcnt);
|
|
ret = io->write_blocks(io, io->media->media_id, blknr,
|
|
blkcnt * io->media->block_size, (void *)buffer);
|
|
log_debug("ret=%lx (dec %ld)\n", ret & ~EFI_ERROR_MASK,
|
|
ret & ~EFI_ERROR_MASK);
|
|
if (ret)
|
|
return 0;
|
|
|
|
return blkcnt;
|
|
}
|
|
|
|
/* Block device driver operators */
|
|
static const struct blk_ops efi_blk_ops = {
|
|
.read = efi_bl_read,
|
|
.write = efi_bl_write,
|
|
};
|
|
|
|
U_BOOT_DRIVER(efi_block) = {
|
|
.name = "efi_block",
|
|
.id = UCLASS_BLK,
|
|
.ops = &efi_blk_ops,
|
|
.plat_auto = sizeof(struct efi_block_plat),
|
|
};
|
|
|
|
static int efi_media_bind(struct udevice *dev)
|
|
{
|
|
struct efi_media_plat *plat = dev_get_plat(dev);
|
|
struct efi_block_plat *blk_plat;
|
|
struct udevice *blk;
|
|
int ret;
|
|
|
|
ret = blk_create_devicef(dev, "efi_block", "blk", IF_TYPE_EFI_MEDIA,
|
|
dev_seq(dev), plat->blkio->media->block_size,
|
|
plat->blkio->media->last_block, &blk);
|
|
if (ret) {
|
|
debug("Cannot create block device\n");
|
|
return ret;
|
|
}
|
|
blk_plat = dev_get_plat(blk);
|
|
blk_plat->blkio = plat->blkio;
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(efi_media) = {
|
|
.name = "efi_media",
|
|
.id = UCLASS_EFI_MEDIA,
|
|
.bind = efi_media_bind,
|
|
.plat_auto = sizeof(struct efi_media_plat),
|
|
};
|