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rng: rockchip: add hardware rand library 

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: Id22c5725158d86cc8a2ff80fdf09b0146d04be41
This commit is contained in:
Joseph Chen 2021-01-29 20:06:29 +08:00 committed by Jianhong Chen
parent 6126937122
commit 3f0522ce8f
2 changed files with 45 additions and 0 deletions
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5
drivers/rng/Makefile
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@ -5,3 +5,8 @@
obj-$(CONFIG_DM_RNG) += rng-uclass.o obj-$(CONFIG_DM_RNG) += rng-uclass.o
obj-$(CONFIG_RNG_ROCKCHIP) += rockchip_rng.o obj-$(CONFIG_RNG_ROCKCHIP) += rockchip_rng.o
ifdef CONFIG_LIB_HW_RAND
obj-$(CONFIG_RNG_ROCKCHIP) += rockchip_rand.o
endif

40
drivers/rng/rockchip_rand.c Normal file
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@ -0,0 +1,40 @@
/*
* (C) Copyright 2021 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <rng.h>
unsigned int rand_r(unsigned int *seedp)
{
struct udevice *dev;
unsigned int rand;
int ret;
ret = uclass_get_device(UCLASS_RNG, 0, &dev);
if (ret) {
printf("No RNG device, ret=%d\n", ret);
return ret;
}
ret = dm_rng_read(dev, &rand, sizeof(unsigned int));
if (ret) {
printf("Reading RNG failed, ret=%d\n", ret);
return ret;
}
return rand;
}
unsigned int rand(void)
{
return rand_r(0);
}
void srand(unsigned int seed)
{
/* nothing to do */
}