at91_aic.c

基于ARM7微控制器AT91X40开发板的定时器程序

/*
 * at91_aic.c
 * 
 * author: Kexin ([e-mail]) Tel:[phone]
 * date:   2007-11-22	
 */
#include "at91_aic.h"

extern unsigned long svr[32];

static unsigned char at91_irq_prtable[32]={
7,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,0,0};

void at91_mask_irq(unsigned int irq)
{
  unsigned long mask=1<<irq;
  *(volatile unsigned int  *)AIC_IDCR=mask;  
}

void at91_unmask_irq(unsigned int irq)
{
   unsigned long mask=1<<irq;
   *(volatile unsigned int  *)AIC_IECR=mask;
}

void at91_mask_ack_irq(unsigned int irq)
{
   at91_mask_irq(irq);
   *(volatile unsigned int  *)AIC_EOICR=0x00;
}

int at91_request_irq(unsigned int irq_num,void *irq_isr)
{
   if(irq_num>0&&irq_num<32)
   {
     svr[irq_num] = (unsigned long)irq_isr;
     return 1;
   }
   else
   return -1;
}

int at91_release_irq(unsigned int irq_num)
{
	 
   if(irq_num>0&&irq_num<32)
   {
   	 if( svr[irq_num] != 0)
   	 	{
        svr[irq_num] = (unsigned long)0;
        return 1;
      }
      else
      	return -1;
   }
   else
     return -1;
}

void at91_init_aic(void)
{
   int irqnum;
   *(volatile unsigned int  *)AIC_IDCR=0xffffffff;
   *(volatile unsigned int  *)AIC_ICCR=0xffffffff;
   for(irqnum=0;irqnum<32;irqnum++) *(volatile unsigned int  *)AIC_EOICR=irqnum;
   for(irqnum=0;irqnum<32;irqnum++) *(volatile unsigned int  *)(AIC_SMR(irqnum))=at91_irq_prtable[irqnum] | EdgeTriggered;
}