b151cd6bc7
Add a new entropy driver based on the nrf HAL CRACEN CTR DRBG driver Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <nrfx_cracen.h>
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#include <zephyr/irq.h>
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#include <zephyr/drivers/entropy.h>
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#define DT_DRV_COMPAT nordic_nrf_cracen_ctrdrbg
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static int nrf_cracen_get_entropy_isr(const struct device *dev, uint8_t *buf, uint16_t len,
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uint32_t flags)
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{
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(void)dev;
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(void)flags;
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unsigned int key = irq_lock();
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/* This will be done in less than 1 microsecond */
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int ret = nrfx_cracen_ctr_drbg_random_get(buf, len);
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irq_unlock(key);
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if (likely(ret == NRFX_SUCCESS)) {
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return len;
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} else if (ret == NRFX_ERROR_INVALID_PARAM) {
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return -EINVAL;
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} else {
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return -EAGAIN;
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}
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}
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static int nrf_cracen_get_entropy(const struct device *dev, uint8_t *buf, uint16_t len)
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{
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int ret = nrf_cracen_get_entropy_isr(dev, buf, len, 0);
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if (ret < 0) {
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return ret;
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} else {
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return 0;
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}
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}
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static int nrf_cracen_cracen_init(const struct device *dev)
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{
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(void)dev;
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int ret = nrfx_cracen_ctr_drbg_init();
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if (ret == NRFX_SUCCESS) {
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return 0;
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} else {
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return -EIO;
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}
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}
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static DEVICE_API(entropy, nrf_cracen_api_funcs) = {
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.get_entropy = nrf_cracen_get_entropy,
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.get_entropy_isr = nrf_cracen_get_entropy_isr
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};
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DEVICE_DT_INST_DEFINE(0, nrf_cracen_cracen_init, NULL, NULL, NULL, PRE_KERNEL_1,
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CONFIG_ENTROPY_INIT_PRIORITY, &nrf_cracen_api_funcs);
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