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 <common.h>
8 #include <blk.h>
9 #include <command.h>
10 #include <dm.h>
11 #include <virtio_types.h>
12 #include <virtio.h>
13
14 static int virtio_curr_dev;
15
do_virtio(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])16 static int do_virtio(struct cmd_tbl *cmdtp, int flag, int argc,
17 char *const argv[])
18 {
19 if (argc == 2 && !strcmp(argv[1], "scan")) {
20 /*
21 * make sure all virtio devices are enumerated.
22 * Do the same as virtio_init(), but also call
23 * device_probe() for children (i.e. virtio devices)
24 */
25 struct udevice *bus, *child;
26
27 uclass_first_device(UCLASS_VIRTIO, &bus);
28 if (!bus)
29 return CMD_RET_FAILURE;
30
31 while (bus) {
32 device_foreach_child_probe(child, bus)
33 ;
34 uclass_next_device(&bus);
35 }
36
37 return CMD_RET_SUCCESS;
38 }
39
40 return blk_common_cmd(argc, argv, UCLASS_VIRTIO, &virtio_curr_dev);
41 }
42
43 U_BOOT_CMD(
44 virtio, 8, 1, do_virtio,
45 "virtio block devices sub-system",
46 "scan - initialize virtio bus\n"
47 "virtio info - show all available virtio block devices\n"
48 "virtio device [dev] - show or set current virtio block device\n"
49 "virtio part [dev] - print partition table of one or all virtio block devices\n"
50 "virtio read addr blk# cnt - read `cnt' blocks starting at block\n"
51 " `blk#' to memory address `addr'\n"
52 "virtio write addr blk# cnt - write `cnt' blocks starting at block\n"
53 " `blk#' from memory address `addr'"
54 );
55