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
|
/*
* 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);
}
/*
* 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);
}
static void rm9k_cpu_irq_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
unmask_rm9k_irq(irq);
}
static struct irq_chip rm9k_irq_controller = {
.typename = "RM9000",
.ack = mask_rm9k_irq,
.mask = mask_rm9k_irq,
.mask_ack = mask_rm9k_irq,
.unmask = unmask_rm9k_irq,
.end = rm9k_cpu_irq_end,
};
static struct irq_chip rm9k_perfcounter_irq = {
.typename = "RM9000",
.startup = rm9k_perfcounter_irq_startup,
.shutdown = rm9k_perfcounter_irq_shutdown,
.ack = mask_rm9k_irq,
.mask = mask_rm9k_irq,
.mask_ack = mask_rm9k_irq,
.unmask = unmask_rm9k_irq,
.end = 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++)
set_irq_chip(i, &rm9k_irq_controller);
rm9000_perfcount_irq = base + 1;
set_irq_chip(rm9000_perfcount_irq, &rm9k_perfcounter_irq);
irq_base = base;
}
|
