72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/* entropy_nxp_ele.c - NXP ELE entropy driver */
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/*
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* Copyright 2025 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_ele_trng
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#include <zephyr/logging/log.h>
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#include <zephyr/drivers/entropy.h>
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#include <zephyr/kernel.h>
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#include <zephyr/sys/atomic.h>
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#include <zephyr/sys/util.h>
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#include <soc.h>
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#include "sss_crypto.h"
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struct entropy_ele_data_str {
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struct k_sem sem_lock;
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};
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static struct entropy_ele_data_str entropy_ele_data;
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static int entropy_ele_get_entropy(const struct device *dev, uint8_t *buf, uint16_t len)
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{
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sss_sscp_rng_t ctx;
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int result = -EIO;
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__ASSERT_NO_MSG(buf != NULL);
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__ASSERT_NO_MSG(&entropy_ele_data == dev->data);
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k_sem_take(&entropy_ele_data.sem_lock, K_FOREVER);
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if (CRYPTO_InitHardware() != kStatus_Success) {
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goto exit;
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}
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if (sss_sscp_rng_context_init(&g_sssSession, &ctx, 0u) != kStatus_SSS_Success) {
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goto exit;
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}
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if (sss_sscp_rng_get_random(&ctx, buf, len) != kStatus_SSS_Success) {
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goto exit;
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}
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if (sss_sscp_rng_free(&ctx) != kStatus_SSS_Success) {
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goto exit;
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}
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result = 0;
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exit:
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k_sem_give(&entropy_ele_data.sem_lock);
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return result;
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}
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static int entropy_ele_init(const struct device *dev)
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{
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__ASSERT_NO_MSG(&entropy_ele_data == dev->data);
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k_sem_init(&entropy_ele_data.sem_lock, 1, 1);
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return 0;
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}
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static DEVICE_API(entropy, entropy_ele_api_funcs) = {.get_entropy = entropy_ele_get_entropy};
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DEVICE_DT_INST_DEFINE(0, entropy_ele_init, NULL, &entropy_ele_data, NULL, PRE_KERNEL_1,
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CONFIG_ENTROPY_INIT_PRIORITY, &entropy_ele_api_funcs);
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