1/*
2 * irq.c: GT64120 Interrupt Controller
3 *
4 * Copyright (C) 2006, Wind River System Inc.
5 * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
6 *
7 * This program is free software; you can redistribute  it and/or modify it
8 * under  the terms of  the GNU General  Public License as published by the
9 * Free Software Foundation;  either version 2 of the  License, or (at your
10 * option) any later version.
11 */
12#include <linux/errno.h>
13#include <linux/init.h>
14#include <linux/kernel_stat.h>
15#include <linux/module.h>
16#include <linux/signal.h>
17#include <linux/sched.h>
18#include <linux/types.h>
19#include <linux/interrupt.h>
20#include <linux/ioport.h>
21#include <linux/timex.h>
22#include <linux/slab.h>
23#include <linux/random.h>
24#include <linux/bitops.h>
25#include <asm/bootinfo.h>
26#include <asm/io.h>
27#include <asm/bitops.h>
28#include <asm/mipsregs.h>
29#include <asm/system.h>
30#include <asm/irq_cpu.h>
31#include <asm/gt64120.h>
32
33asmlinkage void plat_irq_dispatch(void)
34{
35	unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
36
37	if (pending & STATUSF_IP7)
38		do_IRQ(WRPPMC_MIPS_TIMER_IRQ);	/* CPU Compare/Count internal timer */
39	else if (pending & STATUSF_IP6)
40		do_IRQ(WRPPMC_UART16550_IRQ);	/* UART 16550 port */
41	else if (pending & STATUSF_IP3)
42		do_IRQ(WRPPMC_PCI_INTA_IRQ);	/* PCI INT_A */
43	else
44		spurious_interrupt();
45}
46
47/**
48 * Initialize GT64120 Interrupt Controller
49 */
50void gt64120_init_pic(void)
51{
52	/* clear CPU Interrupt Cause Registers */
53	GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
54	GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
55
56	/* Disable all interrupts from GT64120 bridge chip */
57	GT_WRITE(GT_INTRMASK_OFS, 0x00);
58	GT_WRITE(GT_HINTRMASK_OFS, 0x00);
59	GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
60	GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
61}
62
63void __init arch_init_irq(void)
64{
65	/* IRQ 0 - 7 are for MIPS common irq_cpu controller */
66	mips_cpu_irq_init();
67
68	gt64120_init_pic();
69}
70