contiki/cpu/cc2538/dev/crypto.c

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/*
* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc2538-crypto
* @{
*
* \file
* Implementation of the cc2538 AES/SHA cryptoprocessor driver
*/
#include "contiki.h"
#include "sys/energest.h"
#include "dev/sys-ctrl.h"
#include "dev/nvic.h"
#include "dev/crypto.h"
#include "dev/aes.h"
#include "reg.h"
#include "lpm.h"
#include <stdbool.h>
/*---------------------------------------------------------------------------*/
static volatile struct process *notification_process = NULL;
/*---------------------------------------------------------------------------*/
/** \brief The AES/SHA cryptoprocessor ISR
*
* This is the interrupt service routine for the AES/SHA
* cryptoprocessor.
*
* This ISR is called at worst from PM0, so lpm_exit() does not need
* to be called.
*/
void
crypto_isr(void)
{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
nvic_interrupt_unpend(NVIC_INT_AES);
nvic_interrupt_disable(NVIC_INT_AES);
if(notification_process != NULL) {
process_poll((struct process *)notification_process);
notification_process = NULL;
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
static bool
permit_pm1(void)
{
return REG(AES_CTRL_ALG_SEL) == 0;
}
/*---------------------------------------------------------------------------*/
void
crypto_init(void)
{
volatile int i;
lpm_register_peripheral(permit_pm1);
crypto_enable();
/* Reset the AES/SHA cryptoprocessor */
REG(SYS_CTRL_SRSEC) |= SYS_CTRL_SRSEC_AES;
for(i = 0; i < 16; i++);
REG(SYS_CTRL_SRSEC) &= ~SYS_CTRL_SRSEC_AES;
}
/*---------------------------------------------------------------------------*/
void
crypto_enable(void)
{
/* Enable the clock for the AES/SHA cryptoprocessor */
REG(SYS_CTRL_RCGCSEC) |= SYS_CTRL_RCGCSEC_AES;
REG(SYS_CTRL_SCGCSEC) |= SYS_CTRL_SCGCSEC_AES;
REG(SYS_CTRL_DCGCSEC) |= SYS_CTRL_DCGCSEC_AES;
}
/*---------------------------------------------------------------------------*/
void
crypto_disable(void)
{
/* Gate the clock for the AES/SHA cryptoprocessor */
REG(SYS_CTRL_RCGCSEC) &= ~SYS_CTRL_RCGCSEC_AES;
REG(SYS_CTRL_SCGCSEC) &= ~SYS_CTRL_SCGCSEC_AES;
REG(SYS_CTRL_DCGCSEC) &= ~SYS_CTRL_DCGCSEC_AES;
}
/*---------------------------------------------------------------------------*/
void
crypto_register_process_notification(struct process *p)
{
notification_process = p;
}
/** @} */