1/*
2 * Copyright (C) 2007 Lemote Inc. & Institute 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/delay.h>
11#include <linux/interrupt.h>
12
13#include <loongson.h>
14/*
15 * the first level int-handler will jump here if it is a bonito irq
16 */
17void bonito_irqdispatch(void)
18{
19	u32 int_status;
20	int i;
21
22	/* workaround the IO dma problem: let cpu looping to allow DMA finish */
23	int_status = LOONGSON_INTISR;
24	while (int_status & (1 << 10)) {
25		udelay(1);
26		int_status = LOONGSON_INTISR;
27	}
28
29	/* Get pending sources, masked by current enables */
30	int_status = LOONGSON_INTISR & LOONGSON_INTEN;
31
32	if (int_status) {
33		i = __ffs(int_status);
34		do_IRQ(LOONGSON_IRQ_BASE + i);
35	}
36}
37
38asmlinkage void plat_irq_dispatch(void)
39{
40	unsigned int pending;
41
42	pending = read_c0_cause() & read_c0_status() & ST0_IM;
43
44	/* machine-specific plat_irq_dispatch */
45	mach_irq_dispatch(pending);
46}
47
48void __init arch_init_irq(void)
49{
50	/*
51	 * Clear all of the interrupts while we change the able around a bit.
52	 * int-handler is not on bootstrap
53	 */
54	clear_c0_status(ST0_IM | ST0_BEV);
55
56	/* no steer */
57	LOONGSON_INTSTEER = 0;
58
59	/*
60	 * Mask out all interrupt by writing "1" to all bit position in
61	 * the interrupt reset reg.
62	 */
63	LOONGSON_INTENCLR = ~0;
64
65	/* machine specific irq init */
66	mach_init_irq();
67}
68