1/*
2 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
3 * Author: Fuxin Zhang, zhangfx@lemote.com
4 *
5 *  This program is free software; you can redistribute	 it and/or modify it
6 *  under  the terms of	 the GNU General  Public License as published by the
7 *  Free Software Foundation;  either version 2 of the	License, or (at your
8 *  option) any later version.
9 */
10#include <linux/interrupt.h>
11
12#include <asm/irq_cpu.h>
13#include <asm/i8259.h>
14
15#include <loongson.h>
16
17static void i8259_irqdispatch(void)
18{
19	int irq;
20
21	irq = i8259_irq();
22	if (irq >= 0)
23		do_IRQ(irq);
24	else
25		spurious_interrupt();
26}
27
28asmlinkage void mach_irq_dispatch(unsigned int pending)
29{
30	if (pending & CAUSEF_IP7)
31		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
32	else if (pending & CAUSEF_IP6) /* perf counter loverflow */
33		do_perfcnt_IRQ();
34	else if (pending & CAUSEF_IP5)
35		i8259_irqdispatch();
36	else if (pending & CAUSEF_IP2)
37		bonito_irqdispatch();
38	else
39		spurious_interrupt();
40}
41
42static struct irqaction cascade_irqaction = {
43	.handler = no_action,
44	.name = "cascade",
45	.flags = IRQF_NO_THREAD,
46};
47
48void __init mach_init_irq(void)
49{
50	/* init all controller
51	 *   0-15	  ------> i8259 interrupt
52	 *   16-23	  ------> mips cpu interrupt
53	 *   32-63	  ------> bonito irq
54	 */
55
56	/* most bonito irq should be level triggered */
57	LOONGSON_INTEDGE = LOONGSON_ICU_SYSTEMERR | LOONGSON_ICU_MASTERERR |
58	    LOONGSON_ICU_RETRYERR | LOONGSON_ICU_MBOXES;
59
60	/* Sets the first-level interrupt dispatcher. */
61	mips_cpu_irq_init();
62	init_i8259_irqs();
63	bonito_irq_init();
64
65	/* bonito irq at IP2 */
66	setup_irq(MIPS_CPU_IRQ_BASE + 2, &cascade_irqaction);
67	/* 8259 irq at IP5 */
68	setup_irq(MIPS_CPU_IRQ_BASE + 5, &cascade_irqaction);
69}
70