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
|
/*
* linux/arch/arm/mach-iop33x/irq.c
*
* Generic IOP331 IRQ handling functionality
*
* Author: Dave Jiang <dave.jiang@intel.com>
* Copyright (C) 2003 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <asm/mach/irq.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
static u32 iop331_mask0 = 0;
static u32 iop331_mask1 = 0;
static inline void intctl_write0(u32 val)
{
// INTCTL0
iop3xx_cp6_enable();
asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val));
iop3xx_cp6_disable();
}
static inline void intctl_write1(u32 val)
{
// INTCTL1
iop3xx_cp6_enable();
asm volatile("mcr p6,0,%0,c1,c0,0"::"r" (val));
iop3xx_cp6_disable();
}
static inline void intstr_write0(u32 val)
{
// INTSTR0
iop3xx_cp6_enable();
asm volatile("mcr p6,0,%0,c2,c0,0"::"r" (val));
iop3xx_cp6_disable();
}
static inline void intstr_write1(u32 val)
{
// INTSTR1
iop3xx_cp6_enable();
asm volatile("mcr p6,0,%0,c3,c0,0"::"r" (val));
iop3xx_cp6_disable();
}
static inline void intbase_write(u32 val)
{
iop3xx_cp6_enable();
asm volatile("mcr p6, 0, %0, c12, c0, 0" : : "r" (val));
iop3xx_cp6_disable();
}
static inline void intsize_write(u32 val)
{
iop3xx_cp6_enable();
asm volatile("mcr p6, 0, %0, c13, c0, 0" : : "r" (val));
iop3xx_cp6_disable();
}
static void
iop331_irq_mask1 (unsigned int irq)
{
iop331_mask0 &= ~(1 << irq);
intctl_write0(iop331_mask0);
}
static void
iop331_irq_mask2 (unsigned int irq)
{
iop331_mask1 &= ~(1 << (irq - 32));
intctl_write1(iop331_mask1);
}
static void
iop331_irq_unmask1(unsigned int irq)
{
iop331_mask0 |= (1 << irq);
intctl_write0(iop331_mask0);
}
static void
iop331_irq_unmask2(unsigned int irq)
{
iop331_mask1 |= (1 << (irq - 32));
intctl_write1(iop331_mask1);
}
struct irq_chip iop331_irqchip1 = {
.name = "IOP-1",
.ack = iop331_irq_mask1,
.mask = iop331_irq_mask1,
.unmask = iop331_irq_unmask1,
};
struct irq_chip iop331_irqchip2 = {
.name = "IOP-2",
.ack = iop331_irq_mask2,
.mask = iop331_irq_mask2,
.unmask = iop331_irq_unmask2,
};
void __init iop331_init_irq(void)
{
unsigned int i;
intctl_write0(0); // disable all interrupts
intctl_write1(0);
intstr_write0(0); // treat all as IRQ
intstr_write1(0);
intbase_write(0);
intsize_write(1);
if(machine_is_iq80331()) // all interrupts are inputs to chip
*IOP3XX_PCIIRSR = 0x0f;
for(i = 0; i < NR_IRQS; i++)
{
set_irq_chip(i, (i < 32) ? &iop331_irqchip1 : &iop331_irqchip2);
set_irq_handler(i, do_level_IRQ);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
}
}
|
