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
|
/*
* arch/arm/mach-iop32x/irq.c
*
* Generic IOP32X IRQ handling functionality
*
* Author: Rory Bolt <rorybolt@pacbell.net>
* Copyright (C) 2002 Rory Bolt
*
* 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 iop32x_mask;
static void intctl_write(u32 val)
{
asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
}
static void intstr_write(u32 val)
{
asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
}
static void
iop32x_irq_mask(unsigned int irq)
{
iop32x_mask &= ~(1 << irq);
intctl_write(iop32x_mask);
}
static void
iop32x_irq_unmask(unsigned int irq)
{
iop32x_mask |= 1 << irq;
intctl_write(iop32x_mask);
}
struct irq_chip ext_chip = {
.name = "IOP32x",
.ack = iop32x_irq_mask,
.mask = iop32x_irq_mask,
.unmask = iop32x_irq_unmask,
};
void __init iop32x_init_irq(void)
{
int i;
iop_init_cp6_handler();
intctl_write(0);
intstr_write(0);
if (machine_is_glantank() ||
machine_is_iq80321() ||
machine_is_iq31244() ||
machine_is_n2100())
*IOP3XX_PCIIRSR = 0x0f;
for (i = 0; i < NR_IRQS; i++) {
set_irq_chip(i, &ext_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
}
}
|
