129 lines
4 KiB
C
129 lines
4 KiB
C
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/*
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* Original file:
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Port to Contiki:
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* Copyright (c) 2014 Andreas Dröscher <contiki@anticat.ch>
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-pka
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* @{
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*
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* \file
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* Implementation of the cc2538 PKA engine driver
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*/
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#include "contiki.h"
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#include "sys/energest.h"
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#include "dev/pka.h"
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#include "dev/sys-ctrl.h"
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#include "dev/nvic.h"
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#include "lpm.h"
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#include "reg.h"
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#include <stdbool.h>
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#include <stdint.h>
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static volatile struct process *notification_process = NULL;
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/*---------------------------------------------------------------------------*/
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/** \brief The PKA engine ISR
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*
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* This is the interrupt service routine for the PKA engine.
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*
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* This ISR is called at worst from PM0, so lpm_exit() does not need
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* to be called.
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*/
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void
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pka_isr(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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nvic_interrupt_unpend(NVIC_INT_PKA);
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nvic_interrupt_disable(NVIC_INT_PKA);
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if(notification_process != NULL) {
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process_poll((struct process *)notification_process);
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notification_process = NULL;
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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static bool
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permit_pm1(void)
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{
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return (REG(PKA_FUNCTION) & PKA_FUNCTION_RUN) == 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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pka_init(void)
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{
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volatile int i;
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lpm_register_peripheral(permit_pm1);
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pka_enable();
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/* Reset the PKA engine */
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REG(SYS_CTRL_SRSEC) |= SYS_CTRL_SRSEC_PKA;
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for(i = 0; i < 16; i++) {
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REG(SYS_CTRL_SRSEC) &= ~SYS_CTRL_SRSEC_PKA;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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pka_enable(void)
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{
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/* Enable the clock for the PKA engine */
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REG(SYS_CTRL_RCGCSEC) |= SYS_CTRL_RCGCSEC_PKA;
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REG(SYS_CTRL_SCGCSEC) |= SYS_CTRL_SCGCSEC_PKA;
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REG(SYS_CTRL_DCGCSEC) |= SYS_CTRL_DCGCSEC_PKA;
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}
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/*---------------------------------------------------------------------------*/
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void
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pka_disable(void)
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{
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/* Gate the clock for the PKA engine */
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REG(SYS_CTRL_RCGCSEC) &= ~SYS_CTRL_RCGCSEC_PKA;
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REG(SYS_CTRL_SCGCSEC) &= ~SYS_CTRL_SCGCSEC_PKA;
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REG(SYS_CTRL_DCGCSEC) &= ~SYS_CTRL_DCGCSEC_PKA;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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pka_check_status(void)
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{
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return (REG(PKA_FUNCTION) & PKA_FUNCTION_RUN) == 0;
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}
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void
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pka_register_process_notification(struct process *p)
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{
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notification_process = p;
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}
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/** @} */
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