interrupt.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : trap.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 *                Triseel
 */
#include <rtthread.h>
#include "AT9200.h"

#define MAX_HANDLERS	32

extern rt_uint32_t rt_interrupt_nest;

/* exception and interrupt handler table */
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrput_flag;

/**
 * @addtogroup AT91RM9200
 */
/*@{*/

/* default int handler func*/
void rt_hw_interrupt_handle(int vector)
{
	rt_kprintf("interrupt: %d happen but not handled\n", vector);
}

void rt_hw_spu_handle(int vector)
{
	/* indicate interrupt handle end */
	REG_OUT32(AT9200_AIC_EOICR, 0, vector);
}

/**
 * This function will initialize hardware interrupt
 */
void rt_hw_interrupt_init(void)
{
	register int i;

	REG_OUT32(AT9200_AIC_IDCR, 0, 0xFFFFFFFF);  /* disable all interrupts */
	REG_OUT32(AT9200_AIC_ICCR, 0, 0xFFFFFFFF);  /* clear all pending interrupts */

	/* circlr 32 times to init all int trigger mode & prio & default int handler func */
	for (i = 0; i < MAX_HANDLERS; i++)
	{
		/* config the default int handler func*/
		REG_OUT32(AT9200_AIC_SVR, i*4, rt_hw_interrupt_handle);

		/* config trigger mode & priority(edge trigger, lowest priority) */
		REG_OUT32(AT9200_AIC_SMR, i*4, 0x20);
	}

	REG_OUT32(AT9200_AIC_SPU, 0, rt_hw_spu_handle);  /* config spurious int vec reg*/
	REG_OUT32(AT9200_AIC_DCR, 0, 0x0 );  /* Protection Mode disabled, nIRQ and nFIQ lines are normally controlled by the AIC. */

	/*clear AIC_EOICR 8 times*/
	for (i=0;i<8;i++)
	{
		REG_OUT32(AT9200_AIC_EOICR, 0, 0x0);
	}

	/* init interrupt nest, and context in thread sp */
	rt_interrupt_nest = 0;
	rt_interrupt_from_thread = 0;
	rt_interrupt_to_thread = 0;
	rt_thread_switch_interrput_flag = 0;
}

/**
 * This function will mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_mask(int vector)
{
	if (vector < MAX_HANDLERS)
	{
		REG_OUT32(AT9200_AIC_IDCR, 0x00, 1<<vector);
	}
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
	if (vector < MAX_HANDLERS)
	{
		REG_OUT32(AT9200_AIC_IECR, 0x00, 1<<vector);
	}
}

/**
 * This function will install a interrupt service routine to a interrupt.
 * @param vector the interrupt number
 * @param new_handler the interrupt service routine to be installed
 * @param old_handler the old interrupt service routine
 */
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
	if (vector < MAX_HANDLERS)
	{
		if (old_handler!=RT_NULL) *old_handler=(rt_isr_handler_t)REG_IN32(AT9200_AIC_SVR, vector*4);

		if (new_handler != RT_NULL)
			REG_OUT32(AT9200_AIC_SVR , vector*4, new_handler);	/* interrupt vector */
		else
			REG_OUT32(AT9200_AIC_SVR , vector*4, rt_hw_interrupt_handle);	/* default interrupt vector */
	}
}

/*@}*/