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/*
* Philps LPC22XX Interrupt handler
*
* Copyright (c) 2006 by Ray<rayx.cn@gmail.com> to support LPC ARM
* 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 <lpc22xx.h>
/*
* This function check that the value given for the irq line
* is valid.
*/
static int isValidInterrupt(int irq)
{
if ( (irq < 0) || (irq >= BSP_MAX_INT))
return 0;
return 1;
}
/*
* Installs the interrupt handler.
*
* You should only have to add the code to unmask the interrupt.
*
*/
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
rtems_irq_hdl *bsp_tbl;
int *vic_cntl;
bsp_tbl = (rtems_irq_hdl *)VICVectAddrBase;
vic_cntl=(int *)VICVectCntlBase;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if default handler is actually connected. If not issue an error.
*/
if (bsp_tbl[irq->name] != default_int_handler) {
return 0;
}
rtems_interrupt_disable(level);
/*
* store the new handler
*/
bsp_tbl[irq->name] = irq->hdl;
/* *(volatile unsigned long*)(VICVectAddr0+(irq->name * 4)&0x7c )= (uint32_t) irq->hdl;*/
/*
* Enable interrupt on device
*/
vic_cntl[irq->name] = 0x20 | irq->name;
VICIntEnable |= 1 << irq->name;
if(irq->on)
{
irq->on(irq);
}
rtems_interrupt_enable(level);
return 1;
}
/*
* Remove and interrupt handler
*
* You should only have to add the code to mask the interrupt.
*
*/
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
rtems_irq_hdl *bsp_tbl;
bsp_tbl = (rtems_irq_hdl *)&VICVectAddr0;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if the handler is actually connected. If not issue an error.
*/
if (bsp_tbl[irq->name] != irq->hdl) {
return 0;
}
rtems_interrupt_disable(level);
VICIntEnClr = 1 << irq->name;
/*
* Disable interrupt on device
*/
if(irq->off) {
irq->off(irq);
}
/*
* restore the default irq value
*/
bsp_tbl[irq->name] = default_int_handler;
rtems_interrupt_enable(level);
return 1;
}
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