1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2019, Linaro Limited
10 #include <linux/string.h>
12 static int sandbox_rng_read(struct udevice *dev, void *data, size_t len)
14 unsigned int i, seed, random;
15 unsigned char *buf = data;
21 nloops = len / sizeof(random);
22 seed = get_timer(0) ^ rand();
25 for (i = 0, nrem = len; i < nloops; i++) {
27 memcpy(buf, &random, sizeof(random));
28 buf += sizeof(random);
29 nrem -= sizeof(random);
34 memcpy(buf, &random, nrem);
40 static const struct dm_rng_ops sandbox_rng_ops = {
41 .read = sandbox_rng_read,
44 static const struct udevice_id sandbox_rng_match[] = {
46 .compatible = "sandbox,sandbox-rng",
51 U_BOOT_DRIVER(sandbox_rng) = {
52 .name = "sandbox-rng",
54 .of_match = sandbox_rng_match,
55 .ops = &sandbox_rng_ops,