summaryrefslogtreecommitdiffstats
path: root/openwrt/package/linux/kernel-source/arch/mips/brcm-boards/generic/irq.c
blob: 157c6b3803d32d24bdbb5a66229e471ff7ef3a9f (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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Generic interrupt control functions for Broadcom MIPS boards
 *
 * Copyright 2004, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 * $Id$
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/gdb-stub.h>

#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)

extern asmlinkage void brcmIRQ(void);
extern asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs);

void
brcm_irq_dispatch(struct pt_regs *regs)
{
	u32 cause;

	cause = read_c0_cause() &
		read_c0_status() &
		CAUSEF_IP;

#ifdef CONFIG_KERNPROF
	change_c0_status(cause | 1, 1);
#else
	clear_c0_status(cause);
#endif

	if (cause & CAUSEF_IP7)
		do_IRQ(7, regs);
	if (cause & CAUSEF_IP2)
		do_IRQ(2, regs);
	if (cause & CAUSEF_IP3)
		do_IRQ(3, regs);
	if (cause & CAUSEF_IP4)
		do_IRQ(4, regs);
	if (cause & CAUSEF_IP5)
		do_IRQ(5, regs);
	if (cause & CAUSEF_IP6)
		do_IRQ(6, regs);
}

static void
enable_brcm_irq(unsigned int irq)
{
	if (irq < 8)
		set_c0_status(1 << (irq + 8));
	else
		set_c0_status(IE_IRQ0);
}

static void
disable_brcm_irq(unsigned int irq)
{
	if (irq < 8)
		clear_c0_status(1 << (irq + 8));
	else
		clear_c0_status(IE_IRQ0);
}

static void
ack_brcm_irq(unsigned int irq)
{
	/* Already done in brcm_irq_dispatch */
}

static unsigned int
startup_brcm_irq(unsigned int irq)
{ 
	enable_brcm_irq(irq);

	return 0; /* never anything pending */
}

static void
end_brcm_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_brcm_irq(irq);
}

static struct hw_interrupt_type brcm_irq_type = {
	typename: "MIPS",
	startup: startup_brcm_irq,
	shutdown: disable_brcm_irq,
	enable: enable_brcm_irq,
	disable: disable_brcm_irq,
	ack: ack_brcm_irq,
	end: end_brcm_irq,
	NULL
};

void __init
init_IRQ(void)
{
	int i;

	for (i = 0; i < NR_IRQS; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = 0;
		irq_desc[i].depth = 1;
		irq_desc[i].handler = &brcm_irq_type;
	}

    	set_except_vector(0, brcmIRQ);
	change_c0_status(ST0_IM, ALLINTS);

#ifdef CONFIG_REMOTE_DEBUG
	printk("Breaking into debugger...\n");
	set_debug_traps();
	breakpoint(); 
#endif
}