mirror of https://github.com/ARMmbed/mbed-os.git
105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/*
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* Copyright (c) 2019-2020 Nuvoton Technology Corporation
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if DEVICE_TRNG
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#include "cmsis.h"
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#include <limits.h>
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#include "crypto-misc.h"
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#include "hal/trng_api.h"
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#include "platform/mbed_toolchain.h"
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#include "platform/mbed_critical.h"
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#include "platform/mbed_error.h"
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#include "nu_modutil.h"
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/* Module init definition: modname, clkidx, clksrc, clkdiv, rstidx, irqnum, misc */
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static const struct nu_modinit_s trng_modinit = {TRNG_0, TRNG_MODULE, 0, 0, TRNG_RST, TRNG_IRQn, NULL};
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/* TRNG init counter. TRNG is kept active as it is non-zero. */
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static uint16_t trng_init_counter = 0U;
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void trng_init(MBED_UNUSED trng_t *obj)
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{
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core_util_critical_section_enter();
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if (trng_init_counter == USHRT_MAX) {
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core_util_critical_section_exit();
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_HAL, MBED_ERROR_CODE_OVERFLOW), \
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"TRNG initialization counter would overflow");
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}
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++ trng_init_counter;
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if (trng_init_counter == 1) {
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/* Enable IP clock */
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CLK_EnableModuleClock(trng_modinit.clkidx);
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/* Reset IP */
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SYS_ResetModule(trng_modinit.rsetidx);
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TRNG_T *trng_base = (TRNG_T *) NU_MODBASE(trng_modinit.modname);
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trng_base->ACT |= TRNG_ACT_ACT_Msk;
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while (!(trng_base->CTL & TRNG_CTL_READY_Msk));
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}
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core_util_critical_section_exit();
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}
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void trng_free(MBED_UNUSED trng_t *obj)
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{
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core_util_critical_section_enter();
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if (trng_init_counter == 0) {
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core_util_critical_section_exit();
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_HAL, MBED_ERROR_CODE_UNDERFLOW), \
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"TRNG initialization counter would underflow");
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}
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-- trng_init_counter;
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if (trng_init_counter == 0) {
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TRNG_T *trng_base = (TRNG_T *) NU_MODBASE(trng_modinit.modname);
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trng_base->ACT &= ~TRNG_ACT_ACT_Msk;
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/* Disable IP clock */
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CLK_DisableModuleClock(trng_modinit.clkidx);
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}
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core_util_critical_section_exit();
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}
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int trng_get_bytes(MBED_UNUSED trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
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{
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/* Check augument validity */
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if (!output && length) {
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return -1;
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}
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uint8_t *output_ind = output;
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uint8_t *output_end = output + length;
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TRNG_T *trng_base = (TRNG_T *) NU_MODBASE(trng_modinit.modname);
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for (; output_ind != output_end; output_ind ++) {
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trng_base->CTL |= TRNG_CTL_TRNGEN_Msk;
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while (!(trng_base->CTL & TRNG_CTL_DVIF_Msk));
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*output_ind = trng_base->DATA & 0xff;
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}
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if (output_length) {
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*output_length = length;
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}
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return 0;
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}
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#endif
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