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entropy_mcux_trng.c
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entropy_mcux_trng.c
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/*
* Copyright (c) 2017 Linaro Limited.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_kinetis_trng
#include <zephyr/device.h>
#include <zephyr/drivers/entropy.h>
#include <zephyr/random/random.h>
#include <zephyr/init.h>
#include "fsl_trng.h"
struct mcux_entropy_config {
TRNG_Type *base;
};
static int entropy_mcux_trng_get_entropy(const struct device *dev,
uint8_t *buffer,
uint16_t length)
{
const struct mcux_entropy_config *config = dev->config;
status_t status;
status = TRNG_GetRandomData(config->base, buffer, length);
__ASSERT_NO_MSG(!status);
return 0;
}
static const struct entropy_driver_api entropy_mcux_trng_api_funcs = {
.get_entropy = entropy_mcux_trng_get_entropy
};
static struct mcux_entropy_config entropy_mcux_config = {
.base = (TRNG_Type *)DT_INST_REG_ADDR(0)
};
static int entropy_mcux_trng_init(const struct device *dev)
{
const struct mcux_entropy_config *config = dev->config;
trng_config_t conf;
status_t status;
status = TRNG_GetDefaultConfig(&conf);
__ASSERT_NO_MSG(!status);
status = TRNG_Init(config->base, &conf);
__ASSERT_NO_MSG(!status);
return 0;
}
DEVICE_DT_INST_DEFINE(0,
entropy_mcux_trng_init, NULL, NULL,
&entropy_mcux_config,
PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
&entropy_mcux_trng_api_funcs);