summaryrefslogtreecommitdiffstats
path: root/arch/mips/loongson/common/irq.c
blob: b32b4a3e513772b94b7376218ceeaa699631bed8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/*
 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
 * Author: Fuxin Zhang, zhangfx@lemote.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/delay.h>
#include <linux/interrupt.h>

#include <loongson.h>
/*
 * the first level int-handler will jump here if it is a bonito irq
 */
void bonito_irqdispatch(void)
{
	u32 int_status;
	int i;

	/* workaround the IO dma problem: let cpu looping to allow DMA finish */
	int_status = BONITO_INTISR;
	if (int_status & (1 << 10)) {
		while (int_status & (1 << 10)) {
			udelay(1);
			int_status = BONITO_INTISR;
		}
	}

	/* Get pending sources, masked by current enables */
	int_status = BONITO_INTISR & BONITO_INTEN;

	if (int_status != 0) {
		i = __ffs(int_status);
		int_status &= ~(1 << i);
		do_IRQ(BONITO_IRQ_BASE + i);
	}
}

asmlinkage void plat_irq_dispatch(void)
{
	unsigned int pending;

	pending = read_c0_cause() & read_c0_status() & ST0_IM;

	/* machine-specific plat_irq_dispatch */
	mach_irq_dispatch(pending);
}

void __init arch_init_irq(void)
{
	/*
	 * Clear all of the interrupts while we change the able around a bit.
	 * int-handler is not on bootstrap
	 */
	clear_c0_status(ST0_IM | ST0_BEV);

	/* setting irq trigger mode */
	set_irq_trigger_mode();

	/* no steer */
	BONITO_INTSTEER = 0;

	/*
	 * Mask out all interrupt by writing "1" to all bit position in
	 * the interrupt reset reg.
	 */
	BONITO_INTENCLR = ~0;

	/* machine specific irq init */
	mach_init_irq();
}
OpenPOWER on IntegriCloud