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/*
* The irq controller for vrc5476.
*
* Copyright (C) 2001 MontaVista Software Inc.
* Author: jsun@mvista.com or jsun@junsun.net
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <asm/system.h>
#include <asm/ddb5xxx/ddb5xxx.h>
static int irq_base;
static void vrc5476_irq_enable(uint irq)
{
nile4_enable_irq(irq - irq_base);
}
static void vrc5476_irq_disable(uint irq)
{
nile4_disable_irq(irq - irq_base);
}
static unsigned int vrc5476_irq_startup(uint irq)
{
nile4_enable_irq(irq - irq_base);
return 0;
}
#define vrc5476_irq_shutdown vrc5476_irq_disable
static void vrc5476_irq_ack(uint irq)
{
nile4_clear_irq(irq - irq_base);
nile4_disable_irq(irq - irq_base);
}
static void vrc5476_irq_end(uint irq)
{
if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
vrc5476_irq_enable(irq);
}
static hw_irq_controller vrc5476_irq_controller = {
"vrc5476",
vrc5476_irq_startup,
vrc5476_irq_shutdown,
vrc5476_irq_enable,
vrc5476_irq_disable,
vrc5476_irq_ack,
vrc5476_irq_end,
NULL /* no affinity stuff for UP */
};
void __init
vrc5476_irq_init(u32 base)
{
u32 i;
irq_base = base;
for (i= base; i< base + NUM_VRC5476_IRQ; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;
irq_desc[i].handler = &vrc5476_irq_controller;
}
}
asmlinkage void
vrc5476_irq_dispatch(struct pt_regs *regs)
{
extern void spurious_interrupt(void);
u32 mask;
int nile4_irq;
mask = nile4_get_irq_stat(0);
/* quick check for possible time interrupt */
if (mask & (1 << VRC5476_IRQ_GPT)) {
do_IRQ(VRC5476_IRQ_BASE + VRC5476_IRQ_GPT, regs);
return;
}
/* check for i8259 interrupts */
if (mask & (1 << VRC5476_I8259_CASCADE)) {
int i8259_irq = nile4_i8259_iack();
do_IRQ(I8259_IRQ_BASE + i8259_irq, regs);
return;
}
/* regular nile4 interrupts (we should not really have any */
for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1) {
if (mask & 1) {
do_IRQ(VRC5476_IRQ_BASE + nile4_irq, regs);
return;
}
}
spurious_interrupt();
}
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