4954937d92
uclass_first_device/uclass_next_device return value will be removed, don't use it. With the current implementation dev is equivalent to !ret. It is redundant to check both, ret check can be replaced with dev check, and ret check inside the iteration is dead code. Signed-off-by: Michal Suchanek <msuchanek@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <blk.h>
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#include <command.h>
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#include <dm.h>
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#include <virtio_types.h>
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#include <virtio.h>
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static int virtio_curr_dev;
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static int do_virtio(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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if (argc == 2 && !strcmp(argv[1], "scan")) {
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/*
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* make sure all virtio devices are enumerated.
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* Do the same as virtio_init(), but also call
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* device_probe() for children (i.e. virtio devices)
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*/
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struct udevice *bus, *child;
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uclass_first_device(UCLASS_VIRTIO, &bus);
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if (!bus)
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return CMD_RET_FAILURE;
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while (bus) {
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device_foreach_child_probe(child, bus)
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;
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uclass_next_device(&bus);
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}
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return CMD_RET_SUCCESS;
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}
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return blk_common_cmd(argc, argv, UCLASS_VIRTIO, &virtio_curr_dev);
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}
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U_BOOT_CMD(
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virtio, 8, 1, do_virtio,
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"virtio block devices sub-system",
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"scan - initialize virtio bus\n"
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"virtio info - show all available virtio block devices\n"
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"virtio device [dev] - show or set current virtio block device\n"
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"virtio part [dev] - print partition table of one or all virtio block devices\n"
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"virtio read addr blk# cnt - read `cnt' blocks starting at block\n"
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" `blk#' to memory address `addr'\n"
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"virtio write addr blk# cnt - write `cnt' blocks starting at block\n"
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" `blk#' from memory address `addr'"
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);
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