12e2aeda11
The entropy driver shall re-init trng when a power state turns off the device. Signed-off-by: Yassine El Aissaoui <yassine.elaissaoui@nxp.com>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited.
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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_kinetis_trng
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#include <zephyr/device.h>
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#include <zephyr/drivers/entropy.h>
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#include <zephyr/random/random.h>
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#include <zephyr/pm/device.h>
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#include <zephyr/init.h>
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#include "fsl_trng.h"
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struct mcux_entropy_config {
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TRNG_Type *base;
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};
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static int entropy_mcux_trng_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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status = TRNG_GetRandomData(config->base, buffer, length);
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__ASSERT_NO_MSG(!status);
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return 0;
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}
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static DEVICE_API(entropy, entropy_mcux_trng_api_funcs) = {
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.get_entropy = entropy_mcux_trng_get_entropy
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};
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static struct mcux_entropy_config entropy_mcux_config = {
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.base = (TRNG_Type *)DT_INST_REG_ADDR(0)
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};
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static int entropy_mcux_trng_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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trng_config_t conf;
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status_t status;
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status = TRNG_GetDefaultConfig(&conf);
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__ASSERT_NO_MSG(!status);
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status = TRNG_Init(config->base, &conf);
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__ASSERT_NO_MSG(!status);
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return 0;
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}
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#ifdef CONFIG_PM_DEVICE
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static int entropy_mcux_trng_pm_action(const struct device *dev, enum pm_device_action action)
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{
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switch (action) {
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case PM_DEVICE_ACTION_RESUME:
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break;
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case PM_DEVICE_ACTION_SUSPEND:
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break;
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case PM_DEVICE_ACTION_TURN_OFF:
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break;
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case PM_DEVICE_ACTION_TURN_ON:
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entropy_mcux_trng_init(dev);
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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#endif /*CONFIG_PM_DEVICE*/
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PM_DEVICE_DT_INST_DEFINE(0, entropy_mcux_trng_pm_action);
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DEVICE_DT_INST_DEFINE(0,
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entropy_mcux_trng_init, PM_DEVICE_DT_INST_GET(0), 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_trng_api_funcs);
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