summaryrefslogtreecommitdiff
path: root/arch/mips/kernel/irq-rm9000.c
blob: bdd1302962567ed54e1e6683bdfd2e16455ba241 (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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * Copyright (C) 2003 Ralf Baechle
 *
 * 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.
 *
 * Handler for RM9000 extended interrupts.  These are a non-standard
 * feature so we handle them separately from standard interrupts.
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/system.h>

static int irq_base;

static inline void unmask_rm9k_irq(unsigned int irq)
{
	set_c0_intcontrol(0x1000 << (irq - irq_base));
}

static inline void mask_rm9k_irq(unsigned int irq)
{
	clear_c0_intcontrol(0x1000 << (irq - irq_base));
}

static inline void rm9k_cpu_irq_enable(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	unmask_rm9k_irq(irq);
	local_irq_restore(flags);
}

static void rm9k_cpu_irq_disable(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	mask_rm9k_irq(irq);
	local_irq_restore(flags);
}

static unsigned int rm9k_cpu_irq_startup(unsigned int irq)
{
	rm9k_cpu_irq_enable(irq);

	return 0;
}

#define	rm9k_cpu_irq_shutdown	rm9k_cpu_irq_disable

/*
 * Performance counter interrupts are global on all processors.
 */
static void local_rm9k_perfcounter_irq_startup(void *args)
{
	unsigned int irq = (unsigned int) args;

	rm9k_cpu_irq_enable(irq);
}

static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
{
	on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);

	return 0;
}

static void local_rm9k_perfcounter_irq_shutdown(void *args)
{
	unsigned int irq = (unsigned int) args;
	unsigned long flags;

	local_irq_save(flags);
	mask_rm9k_irq(irq);
	local_irq_restore(flags);
}

static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
{
	on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
}


/*
 * While we ack the interrupt interrupts are disabled and thus we don't need
 * to deal with concurrency issues.  Same for rm9k_cpu_irq_end.
 */
static void rm9k_cpu_irq_ack(unsigned int irq)
{
	mask_rm9k_irq(irq);
}

static void rm9k_cpu_irq_end(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
		unmask_rm9k_irq(irq);
}

static hw_irq_controller rm9k_irq_controller = {
	"RM9000",
	rm9k_cpu_irq_startup,
	rm9k_cpu_irq_shutdown,
	rm9k_cpu_irq_enable,
	rm9k_cpu_irq_disable,
	rm9k_cpu_irq_ack,
	rm9k_cpu_irq_end,
};

static hw_irq_controller rm9k_perfcounter_irq = {
	"RM9000",
	rm9k_perfcounter_irq_startup,
	rm9k_perfcounter_irq_shutdown,
	rm9k_cpu_irq_enable,
	rm9k_cpu_irq_disable,
	rm9k_cpu_irq_ack,
	rm9k_cpu_irq_end,
};

unsigned int rm9000_perfcount_irq;

EXPORT_SYMBOL(rm9000_perfcount_irq);

void __init rm9k_cpu_irq_init(int base)
{
	int i;

	clear_c0_intcontrol(0x0000f000);		/* Mask all */

	for (i = base; i < base + 4; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = NULL;
		irq_desc[i].depth = 1;
		irq_desc[i].handler = &rm9k_irq_controller;
	}

	rm9000_perfcount_irq = base + 1;
	irq_desc[rm9000_perfcount_irq].handler = &rm9k_perfcounter_irq;

	irq_base = base;
}