72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
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/*
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* Copyright (c) 2021 Safran Passenger Innovations Germany GmbH
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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 silabs_gecko_semailbox
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#include <drivers/entropy.h>
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#include <soc.h>
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#include "em_cmu.h"
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#include "sl_se_manager.h"
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#include "sl_se_manager_entropy.h"
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static int entropy_gecko_se_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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ARG_UNUSED(dev);
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int err = 0;
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sl_status_t status;
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sl_se_command_context_t cmd_ctx;
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status = sl_se_init_command_context(&cmd_ctx);
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if (status == SL_STATUS_OK) {
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status = sl_se_get_random(&cmd_ctx, buffer, length);
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if (status != SL_STATUS_OK) {
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err = -EIO;
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}
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sl_se_deinit_command_context(&cmd_ctx);
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} else {
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err = -EIO;
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}
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return err;
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}
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static int entropy_gecko_se_get_entropy_isr(const struct device *dev,
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uint8_t *buf,
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uint16_t len, uint32_t flags)
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{
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return -ENOTSUP;
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}
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static int entropy_gecko_se_init(const struct device *dev)
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{
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if (sl_se_init()) {
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return -EIO;
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}
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return 0;
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}
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static const struct entropy_driver_api entropy_gecko_se_api_funcs = {
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.get_entropy = entropy_gecko_se_get_entropy,
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.get_entropy_isr = entropy_gecko_se_get_entropy_isr
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};
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#define GECKO_SE_INIT(n) \
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DEVICE_DT_INST_DEFINE(n, \
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entropy_gecko_se_init, NULL, \
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NULL, NULL, \
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PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY, \
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&entropy_gecko_se_api_funcs); \
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DT_INST_FOREACH_STATUS_OKAY(GECKO_SE_INIT)
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