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/*
* irq.c: GT64120 Interrupt Controller
*
* Copyright (C) 2006, Wind River System Inc.
* Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
*
* 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/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/bitops.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/irq_cpu.h>
#include <asm/gt64120.h>
asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
{
unsigned int pending = read_c0_status() & read_c0_cause();
if (pending & STATUSF_IP7)
do_IRQ(WRPPMC_MIPS_TIMER_IRQ, regs); /* CPU Compare/Count internal timer */
else if (pending & STATUSF_IP6)
do_IRQ(WRPPMC_UART16550_IRQ, regs); /* UART 16550 port */
else if (pending & STATUSF_IP3)
do_IRQ(WRPPMC_PCI_INTA_IRQ, regs); /* PCI INT_A */
else
spurious_interrupt(regs);
}
/**
* Initialize GT64120 Interrupt Controller
*/
void gt64120_init_pic(void)
{
/* clear CPU Interrupt Cause Registers */
GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
/* Disable all interrupts from GT64120 bridge chip */
GT_WRITE(GT_INTRMASK_OFS, 0x00);
GT_WRITE(GT_HINTRMASK_OFS, 0x00);
GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
}
void __init arch_init_irq(void)
{
/* enable all CPU interrupt bits. */
set_c0_status(ST0_IM); /* IE bit is still 0 */
/* IRQ 0 - 7 are for MIPS common irq_cpu controller */
mips_cpu_irq_init(0);
gt64120_init_pic();
}
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