/*
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* Copyright (c) 2019-2023 Beijing Hanwei Innovation Technology Ltd. Co. and
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* its subsidiaries and affiliates (collectly called MKSEMI).
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into an MKSEMI
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* integrated circuit in a product or a software update for such product,
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* must reproduce the above copyright notice, this list of conditions and
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* the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of MKSEMI nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* MKSEMI integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be
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* reverse engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY MKSEMI "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL MKSEMI OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mk_trng.h"
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#include "mk_clock.h"
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#include "mk_reset.h"
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static struct TRNG_HANDLE_T trng_handle = {
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.base = TRNG,
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.irq = TRNG_IRQn,
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.cfg = TRNG_CFG_1LSB_VN,
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.data = 0,
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.number = 0,
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.int_en = false,
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.callback = NULL,
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};
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int trng_open(void)
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{
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// enable TRNG clock
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clock_enable(CLOCK_TRNG);
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reset_module(RESET_MODULE_TRNG);
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trng_handle.base->CTRL0 = TRNG_CTRL0_LSB_CFG(trng_handle.cfg);
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#if TRNG_INT_MODE_EN
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if (trng_handle.int_en)
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{
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NVIC_SetPriority(trng_handle.irq, IRQ_PRIORITY_NORMAL);
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NVIC_ClearPendingIRQ(trng_handle.irq);
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NVIC_EnableIRQ(trng_handle.irq);
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}
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#endif
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trng_handle.state = TRNG_STATE_READY;
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return DRV_OK;
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}
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int trng_close(void)
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{
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#if TRNG_INT_MODE_EN
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if (trng_handle.int_en)
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{
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NVIC_DisableIRQ(trng_handle.irq);
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NVIC_ClearPendingIRQ(trng_handle.irq);
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}
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#endif
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// disable TRNG clock
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clock_disable(CLOCK_TRNG);
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trng_handle.state = TRNG_STATE_RESET;
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return DRV_OK;
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}
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int trng_get(uint32_t *data, uint32_t number, drv_callback_t callback)
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{
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uint32_t lock = int_lock();
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// update state
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switch (trng_handle.state)
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{
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case TRNG_STATE_READY:
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trng_handle.state = TRNG_STATE_BUSY;
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break;
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case TRNG_STATE_BUSY:
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int_unlock(lock);
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return DRV_BUSY;
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case TRNG_STATE_RESET:
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case TRNG_STATE_TIMEOUT:
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case TRNG_STATE_ERROR:
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int_unlock(lock);
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return DRV_ERROR;
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}
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trng_handle.data = data;
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trng_handle.number = number;
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trng_handle.count = number;
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trng_handle.callback = callback;
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int_unlock(lock);
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if (trng_handle.int_en)
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{
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#if TRNG_INT_MODE_EN
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// enable interrupt
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trng_handle.base->INTR_EN = TRNG_INTR_EN_MSK;
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trng_handle.base->CTRL1 = TRNG_CTRL1_TRNG_REQ_MSK;
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#endif
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}
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else
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{
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#if TRNG_POLL_MODE_EN
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// polling
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while (trng_handle.count > 0)
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{
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trng_handle.base->CTRL1 = TRNG_CTRL1_TRNG_REQ_MSK;
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while ((trng_handle.base->STATUS & TRNG_STATUS_DONE_MSK) == 0)
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{
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}
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for (uint8_t i = 0; i < 4; i++)
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{
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if (trng_handle.count)
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{
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*trng_handle.data++ = trng_handle.base->DATA[i];
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trng_handle.count--;
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}
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else
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{
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break;
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}
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}
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}
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// update state
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trng_handle.state = TRNG_STATE_READY;
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if (trng_handle.callback)
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{
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trng_handle.callback(trng_handle.data - trng_handle.number, trng_handle.number);
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}
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#endif
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}
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return DRV_OK;
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}
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void TRNG_IRQHandler(void)
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{
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#if TRNG_INT_MODE_EN
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trng_handle.base->INTR_CLR = TRNG_INTR_CLR_MSK;
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for (uint8_t i = 0; i < 4; i++)
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{
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if (trng_handle.count)
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{
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*trng_handle.data++ = trng_handle.base->DATA[i];
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trng_handle.count--;
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}
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else
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{
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break;
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}
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}
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if (trng_handle.count)
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{
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// continue
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trng_handle.base->CTRL1 = TRNG_CTRL1_TRNG_REQ_MSK;
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}
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else
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{
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// finished - update state
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trng_handle.state = TRNG_STATE_READY;
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if (trng_handle.callback)
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{
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trng_handle.callback(trng_handle.data - trng_handle.number, trng_handle.number);
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}
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}
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#endif
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}
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