1 /* 2 * (C) Copyright 2021 Rockchip Electronics Co., Ltd 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 #include <common.h> 7 #include <dm.h> 8 #include <rng.h> 9 10 unsigned int rand_r(unsigned int *seedp) 11 { 12 struct udevice *dev; 13 unsigned int rand; 14 int ret; 15 16 ret = uclass_get_device(UCLASS_RNG, 0, &dev); 17 if (ret) { 18 printf("No RNG device, ret=%d\n", ret); 19 return ret; 20 } 21 22 ret = dm_rng_read(dev, &rand, sizeof(unsigned int)); 23 if (ret) { 24 printf("Reading RNG failed, ret=%d\n", ret); 25 return ret; 26 } 27 28 return rand; 29 } 30 31 unsigned int rand(void) 32 { 33 return rand_r(0); 34 } 35 36 void srand(unsigned int seed) 37 { 38 /* nothing to do */ 39 } 40 41