56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
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* Copyright 2022 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 nxp_css_v2
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#include "mcuxClCss_Rng.h"
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#include <zephyr/device.h>
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#include <zephyr/drivers/entropy.h>
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#include <zephyr/init.h>
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#include <zephyr/random/rand32.h>
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static int entropy_mcux_css_get_entropy(const struct device *dev, uint8_t *buffer, uint16_t length)
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{
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ARG_UNUSED(dev);
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uint8_t status = 0;
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MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(result, token, mcuxClCss_Prng_GetRandom(buffer, length));
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if ((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClCss_Prng_GetRandom) != token) ||
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(result != MCUXCLCSS_STATUS_OK)) {
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status = -EAGAIN;
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}
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MCUX_CSSL_FP_FUNCTION_CALL_END();
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__ASSERT_NO_MSG(!status);
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return status;
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}
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static const struct entropy_driver_api entropy_mcux_css_api_funcs = {
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.get_entropy = entropy_mcux_css_get_entropy
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};
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static int entropy_mcux_css_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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uint8_t status = 0;
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MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(result, token, mcuxClCss_Enable_Async());
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if ((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClCss_Enable_Async) != token) ||
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(result != MCUXCLCSS_STATUS_OK_WAIT)) {
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status = -ENODEV;
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}
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MCUX_CSSL_FP_FUNCTION_CALL_END();
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__ASSERT_NO_MSG(!status);
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return status;
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}
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DEVICE_DT_INST_DEFINE(0, entropy_mcux_css_init, NULL, NULL, NULL, PRE_KERNEL_1,
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CONFIG_ENTROPY_INIT_PRIORITY, &entropy_mcux_css_api_funcs);
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