jcs.org
"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
4 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
5 */
6
7#include <blk.h>
8#include <command.h>
9#include <dm.h>
10#include <virtio_types.h>
11#include <virtio.h>
12
13static int virtio_curr_dev;
14
15static int do_virtio(struct cmd_tbl *cmdtp, int flag, int argc,
16 char *const argv[])
17{
18 if (argc == 2 && !strcmp(argv[1], "scan")) {
19 /*
20 * make sure all virtio devices are enumerated.
21 * Do the same as virtio_init(), but also call
22 * device_probe() for children (i.e. virtio devices)
23 */
24 struct udevice *bus, *child;
25
26 uclass_first_device(UCLASS_VIRTIO, &bus);
27 if (!bus)
28 return CMD_RET_FAILURE;
29
30 while (bus) {
31 device_foreach_child_probe(child, bus)
32 ;
33 uclass_next_device(&bus);
34 }
35
36 return CMD_RET_SUCCESS;
37 }
38
39 return blk_common_cmd(argc, argv, UCLASS_VIRTIO, &virtio_curr_dev);
40}
41
42U_BOOT_CMD(
43 virtio, 8, 1, do_virtio,
44 "virtio block devices sub-system",
45 "scan - initialize virtio bus\n"
46 "virtio info - show all available virtio block devices\n"
47 "virtio device [dev] - show or set current virtio block device\n"
48 "virtio part [dev] - print partition table of one or all virtio block devices\n"
49 "virtio read addr blk# cnt - read `cnt' blocks starting at block\n"
50 " `blk#' to memory address `addr'\n"
51 "virtio write addr blk# cnt - write `cnt' blocks starting at block\n"
52 " `blk#' from memory address `addr'"
53);