50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2024 Renesas Electronics Corporation
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define DT_DRV_COMPAT renesas_ra_rsip_e51a_trng
|
||
|
|
|
||
|
|
#include <soc.h>
|
||
|
|
#include <zephyr/drivers/entropy.h>
|
||
|
|
|
||
|
|
#include "hw_sce_trng_private.h"
|
||
|
|
#include "hw_sce_private.h"
|
||
|
|
|
||
|
|
static int entropy_ra_rsip_trng_get_entropy(const struct device *dev, uint8_t *buf, uint16_t len)
|
||
|
|
{
|
||
|
|
ARG_UNUSED(dev);
|
||
|
|
|
||
|
|
if (buf == NULL) {
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (len > 0) {
|
||
|
|
uint32_t n[4];
|
||
|
|
const uint32_t to_copy = MIN(sizeof(n), len);
|
||
|
|
|
||
|
|
if (FSP_SUCCESS != HW_SCE_RNG_Read(n)) {
|
||
|
|
return -ENODATA;
|
||
|
|
}
|
||
|
|
memcpy(buf, n, to_copy);
|
||
|
|
buf += to_copy;
|
||
|
|
len -= to_copy;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct entropy_driver_api entropy_ra_rsip_trng_api = {
|
||
|
|
.get_entropy = entropy_ra_rsip_trng_get_entropy,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int entropy_ra_rsip_trng_init(const struct device *dev)
|
||
|
|
{
|
||
|
|
HW_SCE_McuSpecificInit();
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
DEVICE_DT_INST_DEFINE(0, entropy_ra_rsip_trng_init, NULL, NULL, NULL, PRE_KERNEL_1,
|
||
|
|
CONFIG_ENTROPY_INIT_PRIORITY, &entropy_ra_rsip_trng_api);
|