72 lines
1.5 KiB
C
72 lines
1.5 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_imx_caam
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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_caam.h"
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struct mcux_entropy_config {
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CAAM_Type *base;
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};
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static caam_job_ring_interface_t jrif;
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static int entropy_mcux_caam_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 mcux_entropy_config *config = dev->config;
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status_t status;
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caam_handle_t handle;
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handle.jobRing = kCAAM_JobRing0;
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status = CAAM_RNG_GetRandomData(
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config->base, &handle, kCAAM_RngStateHandle0,
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buffer, length, kCAAM_RngDataAny, NULL);
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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_mcux_caam_api_funcs = {
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.get_entropy = entropy_mcux_caam_get_entropy
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};
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static const struct mcux_entropy_config entropy_mcux_config = {
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.base = (CAAM_Type *)DT_INST_REG_ADDR(0)
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};
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static int entropy_mcux_caam_init(const struct device *dev)
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{
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const struct mcux_entropy_config *config = dev->config;
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caam_config_t conf;
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status_t status;
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CAAM_GetDefaultConfig(&conf);
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conf.jobRingInterface[0] = &jrif;
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status = CAAM_Init(config->base, &conf);
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__ASSERT_NO_MSG(!status);
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if (status != 0) {
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return -ENODEV;
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}
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return 0;
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}
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DEVICE_DT_INST_DEFINE(0,
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entropy_mcux_caam_init, NULL, NULL,
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&entropy_mcux_config,
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PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
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&entropy_mcux_caam_api_funcs);
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