1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Heinrich Schuchardt
7 * The EFI uclass creates a handle for this driver and installs the
8 * driver binding protocol on it.
10 * The EFI block driver binds to controllers implementing the block io
13 * When the bind function of the EFI block driver is called it creates a
14 * new U-Boot block device. It installs child handles for all partitions and
15 * installs the simple file protocol on these.
17 * The read and write functions of the EFI block driver delegate calls to the
18 * controller that it is bound to.
20 * A usage example is as following:
22 * U-Boot loads the iPXE snp.efi executable. iPXE connects an iSCSI drive and
23 * exposes a handle with the block IO protocol. It calls ConnectController.
25 * Now the EFI block driver installs the partitions with the simple file
28 * iPXE uses the simple file protocol to load Grub or the Linux Kernel.
31 #include <efi_driver.h>
33 #include <dm/device-internal.h>
37 * EFI attributes of the udevice handled by this driver.
39 * handle handle of the controller on which this driver is installed
40 * io block io protocol proxied by this driver
42 struct efi_blk_platdata {
44 struct efi_block_io *io;
48 * Read from block device
51 * @blknr: first block to be read
52 * @blkcnt: number of blocks to read
53 * @buffer: output buffer
54 * Return: number of blocks transferred
56 static ulong efi_bl_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
59 struct efi_blk_platdata *platdata = dev_get_platdata(dev);
60 struct efi_block_io *io = platdata->io;
63 EFI_PRINT("%s: read '%s', from block " LBAFU ", " LBAFU " blocks\n",
64 __func__, dev->name, blknr, blkcnt);
65 ret = EFI_CALL(io->read_blocks(
66 io, io->media->media_id, (u64)blknr,
68 (efi_uintn_t)io->media->block_size, buffer));
69 EFI_PRINT("%s: r = %u\n", __func__,
70 (unsigned int)(ret & ~EFI_ERROR_MASK));
71 if (ret != EFI_SUCCESS)
77 * Write to block device
80 * @blknr: first block to be write
81 * @blkcnt: number of blocks to write
82 * @buffer: input buffer
83 * Return: number of blocks transferred
85 static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
88 struct efi_blk_platdata *platdata = dev_get_platdata(dev);
89 struct efi_block_io *io = platdata->io;
92 EFI_PRINT("%s: write '%s', from block " LBAFU ", " LBAFU " blocks\n",
93 __func__, dev->name, blknr, blkcnt);
94 ret = EFI_CALL(io->write_blocks(
95 io, io->media->media_id, (u64)blknr,
97 (efi_uintn_t)io->media->block_size,
99 EFI_PRINT("%s: r = %u\n", __func__,
100 (unsigned int)(ret & ~EFI_ERROR_MASK));
101 if (ret != EFI_SUCCESS)
107 * Create partions for the block device.
109 * @handle: EFI handle of the block device
110 * @dev: udevice of the block device
111 * Return: number of partitions created
113 static int efi_bl_bind_partitions(efi_handle_t handle, struct udevice *dev)
115 struct blk_desc *desc;
116 const char *if_typename;
118 desc = dev_get_uclass_platdata(dev);
119 if_typename = blk_get_if_type_name(desc->if_type);
121 return efi_disk_create_partitions(handle, desc, if_typename,
122 desc->devnum, dev->name);
126 * Create a block device for a handle
129 * @interface: block io protocol
130 * Return: 0 = success
132 static int efi_bl_bind(efi_handle_t handle, void *interface)
134 struct udevice *bdev, *parent = dm_root();
137 struct efi_object *obj = efi_search_obj(handle);
138 struct efi_block_io *io = interface;
140 struct efi_blk_platdata *platdata;
142 EFI_PRINT("%s: handle %p, interface %p\n", __func__, handle, io);
147 devnum = blk_find_max_devnum(IF_TYPE_EFI);
148 if (devnum == -ENODEV)
153 name = calloc(1, 18); /* strlen("efiblk#2147483648") + 1 */
156 sprintf(name, "efiblk#%d", devnum);
158 /* Create driver model udevice for the EFI block io device */
159 ret = blk_create_device(parent, "efi_blk", name, IF_TYPE_EFI, devnum,
160 io->media->block_size,
161 (lbaint_t)io->media->last_block, &bdev);
166 /* Set the DM_FLAG_NAME_ALLOCED flag to avoid a memory leak */
167 device_set_name_alloced(bdev);
169 platdata = dev_get_platdata(bdev);
170 platdata->handle = handle;
171 platdata->io = interface;
173 ret = device_probe(bdev);
176 EFI_PRINT("%s: block device '%s' created\n", __func__, bdev->name);
178 /* Create handles for the partions of the block device */
179 disks = efi_bl_bind_partitions(handle, bdev);
180 EFI_PRINT("Found %d partitions\n", disks);
185 /* Block device driver operators */
186 static const struct blk_ops efi_blk_ops = {
188 .write = efi_bl_write,
191 /* Identify as block device driver */
192 U_BOOT_DRIVER(efi_blk) = {
196 .platdata_auto_alloc_size = sizeof(struct efi_blk_platdata),
199 /* EFI driver operators */
200 static const struct efi_driver_ops driver_ops = {
201 .protocol = &efi_block_io_guid,
202 .child_protocol = &efi_block_io_guid,
206 /* Identify as EFI driver */
207 U_BOOT_DRIVER(efi_block) = {
208 .name = "EFI block driver",