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/*
* Atmel AT91RM9200 Interrupt handler
*
* Copyright (c) 2004 by Jay Monkman <jtm@lopingdog.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
#include <irq.h>
#include <rtems/score/thread.h>
#include <rtems/score/apiext.h>
#include <at91rm9200.h>
/*
* This function check that the value given for the irq line
* is valid.
*/
static int isValidInterrupt(int irq)
{
if ( (irq < 0) || (irq >= AT91RM9200_MAX_INT)) {
return 0;
}
return 1;
}
/*
* Installs the interrupt handler.
*/
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if default handler is actually connected. If not, issue
* an error. Note: irq->name is a number corresponding to the
* sources PID (see the at91rm9200_pid for this mapping). We
* convert it to a long word offset to get source's vector register
*/
if (AIC_SVR_REG(irq->name * 4) != (uint32_t) default_int_handler) {
return 0;
}
rtems_interrupt_disable(level);
/*
* store the new handler
*/
AIC_SVR_REG(irq->name * 4) = (uint32_t) irq->hdl;
/*
* unmask interrupt
*/
AIC_CTL_REG(AIC_IECR) = 1 << irq->name;
/*
* Enable interrupt on device
*/
if(irq->on) {
irq->on(irq);
}
rtems_interrupt_enable(level);
return 1;
}
/*
* Remove and interrupt handler
*/
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if the handler is actually connected. If not, issue an error.
*/
if (AIC_SVR_REG(irq->name * 4) != (uint32_t) irq->hdl) {
return 0;
}
rtems_interrupt_disable(level);
/*
* mask interrupt
*/
AIC_CTL_REG(AIC_IDCR) = 1 << irq->name;
/*
* Disable interrupt on device
*/
if(irq->off) {
irq->off(irq);
}
/*
* restore the default irq value
*/
AIC_SVR_REG(irq->name * 4) = (uint32_t) default_int_handler;
rtems_interrupt_enable(level);
return 1;
}
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