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71 lines
1.5 KiB
71 lines
1.5 KiB
/* 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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