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cc2538: ccm: Make it possible to use the interrupt

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Using the AES interrupt allows the user process not to waste time
polling for the completion of the operation. This time can be used by
the user process to do something else, or to let the system enter PM0.

Since the system is now free to perform various operations during a
crypto operation, a protection of the crypto resource is added, and PM1+
is prohibited in order not to stall crypto operations.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
This commit is contained in:
Benoît Thébaudeau 2015-05-15 19:53:58 +02:00
parent 117dc4e5e3
commit b92a5afcc4
11 changed files with 166 additions and 48 deletions
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46
cpu/cc2538/dev/crypto.c
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@ -36,15 +36,55 @@
* 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 */
@ -70,5 +110,11 @@ crypto_disable(void)
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;
}
/** @} */