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
|
/*
* Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
*
* 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.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/irq_cpu.h>
#include <loongson1.h>
#include <irq.h>
#define LS1X_INTC_REG(n, x) \
((void __iomem *)KSEG1ADDR(LS1X_INTC_BASE + (n * 0x18) + (x)))
#define LS1X_INTC_INTISR(n) LS1X_INTC_REG(n, 0x0)
#define LS1X_INTC_INTIEN(n) LS1X_INTC_REG(n, 0x4)
#define LS1X_INTC_INTSET(n) LS1X_INTC_REG(n, 0x8)
#define LS1X_INTC_INTCLR(n) LS1X_INTC_REG(n, 0xc)
#define LS1X_INTC_INTPOL(n) LS1X_INTC_REG(n, 0x10)
#define LS1X_INTC_INTEDGE(n) LS1X_INTC_REG(n, 0x14)
static void ls1x_irq_ack(struct irq_data *d)
{
unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
__raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
| (1 << bit), LS1X_INTC_INTCLR(n));
}
static void ls1x_irq_mask(struct irq_data *d)
{
unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
& ~(1 << bit), LS1X_INTC_INTIEN(n));
}
static void ls1x_irq_mask_ack(struct irq_data *d)
{
unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
& ~(1 << bit), LS1X_INTC_INTIEN(n));
__raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
| (1 << bit), LS1X_INTC_INTCLR(n));
}
static void ls1x_irq_unmask(struct irq_data *d)
{
unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
| (1 << bit), LS1X_INTC_INTIEN(n));
}
static struct irq_chip ls1x_irq_chip = {
.name = "LS1X-INTC",
.irq_ack = ls1x_irq_ack,
.irq_mask = ls1x_irq_mask,
.irq_mask_ack = ls1x_irq_mask_ack,
.irq_unmask = ls1x_irq_unmask,
};
static void ls1x_irq_dispatch(int n)
{
u32 int_status, irq;
/* Get pending sources, masked by current enables */
int_status = __raw_readl(LS1X_INTC_INTISR(n)) &
__raw_readl(LS1X_INTC_INTIEN(n));
if (int_status) {
irq = LS1X_IRQ(n, __ffs(int_status));
do_IRQ(irq);
}
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending;
pending = read_c0_cause() & read_c0_status() & ST0_IM;
if (pending & CAUSEF_IP7)
do_IRQ(TIMER_IRQ);
else if (pending & CAUSEF_IP2)
ls1x_irq_dispatch(0); /* INT0 */
else if (pending & CAUSEF_IP3)
ls1x_irq_dispatch(1); /* INT1 */
else if (pending & CAUSEF_IP4)
ls1x_irq_dispatch(2); /* INT2 */
else if (pending & CAUSEF_IP5)
ls1x_irq_dispatch(3); /* INT3 */
else if (pending & CAUSEF_IP6)
ls1x_irq_dispatch(4); /* INT4 */
else
spurious_interrupt();
}
struct irqaction cascade_irqaction = {
.handler = no_action,
.name = "cascade",
.flags = IRQF_NO_THREAD,
};
static void __init ls1x_irq_init(int base)
{
int n;
/* Disable interrupts and clear pending,
* setup all IRQs as high level triggered
*/
for (n = 0; n < 4; n++) {
__raw_writel(0x0, LS1X_INTC_INTIEN(n));
__raw_writel(0xffffffff, LS1X_INTC_INTCLR(n));
__raw_writel(0xffffffff, LS1X_INTC_INTPOL(n));
/* set DMA0, DMA1 and DMA2 to edge trigger */
__raw_writel(n ? 0x0 : 0xe000, LS1X_INTC_INTEDGE(n));
}
for (n = base; n < LS1X_IRQS; n++) {
irq_set_chip_and_handler(n, &ls1x_irq_chip,
handle_level_irq);
}
setup_irq(INT0_IRQ, &cascade_irqaction);
setup_irq(INT1_IRQ, &cascade_irqaction);
setup_irq(INT2_IRQ, &cascade_irqaction);
setup_irq(INT3_IRQ, &cascade_irqaction);
}
void __init arch_init_irq(void)
{
mips_cpu_irq_init();
ls1x_irq_init(LS1X_IRQ_BASE);
}
|
