67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/*
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* Copyright 2019 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT openisa_rv32m1_trng
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#include <zephyr/device.h>
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#include <zephyr/drivers/entropy.h>
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#include <zephyr/random/rand32.h>
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#include <zephyr/init.h>
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#include "fsl_trng.h"
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struct rv32m1_entropy_config {
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TRNG_Type *base;
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};
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static int entropy_rv32m1_trng_get_entropy(const struct device *dev,
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uint8_t *buffer,
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uint16_t length)
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{
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const struct rv32m1_entropy_config *config = dev->config;
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status_t status;
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ARG_UNUSED(dev);
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status = TRNG_GetRandomData(config->base, buffer, length);
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__ASSERT_NO_MSG(!status);
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return 0;
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}
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static const struct entropy_driver_api entropy_rv32m1_trng_api_funcs = {
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.get_entropy = entropy_rv32m1_trng_get_entropy
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};
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static struct rv32m1_entropy_config entropy_rv32m1_config = {
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.base = (TRNG_Type *)DT_INST_REG_ADDR(0)
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};
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static int entropy_rv32m1_trng_init(const struct device *);
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DEVICE_DT_INST_DEFINE(0,
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entropy_rv32m1_trng_init, NULL,
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NULL, &entropy_rv32m1_config,
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PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
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&entropy_rv32m1_trng_api_funcs);
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static int entropy_rv32m1_trng_init(const struct device *dev)
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{
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const struct rv32m1_entropy_config *config = dev->config;
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trng_config_t conf;
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status_t status;
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ARG_UNUSED(dev);
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status = TRNG_GetDefaultConfig(&conf);
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__ASSERT_NO_MSG(!status);
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status = TRNG_Init(config->base, &conf);
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__ASSERT_NO_MSG(!status);
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return 0;
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}
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