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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'rng' command prints bytes from the hardware random number generator.
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*
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* Copyright (c) 2019, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <hexdump.h>
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#include <malloc.h>
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#include <rng.h>
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static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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size_t n;
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u8 buf[64];
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int devnum;
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struct udevice *dev;
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int ret = CMD_RET_SUCCESS, err;
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if (argc == 2 && !strcmp(argv[1], "list")) {
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int idx = 0;
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uclass_foreach_dev_probe(UCLASS_RNG, dev) {
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idx++;
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printf("RNG #%d - %s\n", dev->seq_, dev->name);
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}
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if (!idx) {
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log_err("No RNG device\n");
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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switch (argc) {
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case 1:
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devnum = 0;
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n = 0x40;
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break;
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case 2:
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devnum = hextoul(argv[1], NULL);
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n = 0x40;
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break;
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case 3:
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devnum = hextoul(argv[1], NULL);
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n = hextoul(argv[2], NULL);
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break;
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default:
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return CMD_RET_USAGE;
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}
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if (uclass_get_device_by_seq(UCLASS_RNG, devnum, &dev) || !dev) {
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printf("No RNG device\n");
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return CMD_RET_FAILURE;
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}
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if (!n)
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return 0;
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n = min(n, sizeof(buf));
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err = dm_rng_read(dev, buf, n);
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if (err) {
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puts(err == -EINTR ? "Abort\n" : "Reading RNG failed\n");
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ret = CMD_RET_FAILURE;
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} else {
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print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf, n);
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}
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return ret;
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}
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U_BOOT_CMD(
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rng, 3, 0, do_rng,
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"print bytes from the hardware random number generator",
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"list - list all the probed rng devices\n"
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"rng [dev] [n] - print n random bytes(max 64) read from dev\n"
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);
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