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
|
/*
* Copyright (C) 2007 Lemote Inc.
* Author: Fuxin Zhang, zhangfx@lemote.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/module.h>
#include <asm/irq_cpu.h>
#include <asm/i8259.h>
#include <asm/mipsregs.h>
#include <loongson.h>
#include <machine.h>
#define LOONGSON_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 7) /* cpu timer */
#define LOONGSON_PERFCNT_IRQ (MIPS_CPU_IRQ_BASE + 6) /* cpu perf counter */
#define LOONGSON_NORTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 6) /* bonito */
#define LOONGSON_UART_IRQ (MIPS_CPU_IRQ_BASE + 3) /* cpu serial port */
#define LOONGSON_SOUTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 2) /* i8259 */
#define LOONGSON_INT_BIT_INT0 (1 << 11)
#define LOONGSON_INT_BIT_INT1 (1 << 12)
/*
* The generic i8259_irq() make the kernel hang on booting. Since we cannot
* get the irq via the IRR directly, we access the ISR instead.
*/
int mach_i8259_irq(void)
{
int irq, isr;
irq = -1;
if ((LOONGSON_INTISR & LOONGSON_INTEN) & LOONGSON_INT_BIT_INT0) {
raw_spin_lock(&i8259A_lock);
isr = inb(PIC_MASTER_CMD) &
~inb(PIC_MASTER_IMR) & ~(1 << PIC_CASCADE_IR);
if (!isr)
isr = (inb(PIC_SLAVE_CMD) & ~inb(PIC_SLAVE_IMR)) << 8;
irq = ffs(isr) - 1;
if (unlikely(irq == 7)) {
/*
* This may be a spurious interrupt.
*
* Read the interrupt status register (ISR). If the most
* significant bit is not set then there is no valid
* interrupt.
*/
outb(0x0B, PIC_MASTER_ISR); /* ISR register */
if (~inb(PIC_MASTER_ISR) & 0x80)
irq = -1;
}
raw_spin_unlock(&i8259A_lock);
}
return irq;
}
EXPORT_SYMBOL(mach_i8259_irq);
static void i8259_irqdispatch(void)
{
int irq;
irq = mach_i8259_irq();
if (irq >= 0)
do_IRQ(irq);
else
spurious_interrupt();
}
void mach_irq_dispatch(unsigned int pending)
{
if (pending & CAUSEF_IP7)
do_IRQ(LOONGSON_TIMER_IRQ);
else if (pending & CAUSEF_IP6) { /* North Bridge, Perf counter */
#if defined(CONFIG_OPROFILE) || defined(CONFIG_OPROFILE_MODULE)
do_IRQ(LOONGSON2_PERFCNT_IRQ);
#endif
bonito_irqdispatch();
} else if (pending & CAUSEF_IP3) /* CPU UART */
do_IRQ(LOONGSON_UART_IRQ);
else if (pending & CAUSEF_IP2) /* South Bridge */
i8259_irqdispatch();
else
spurious_interrupt();
}
static irqreturn_t ip6_action(int cpl, void *dev_id)
{
return IRQ_HANDLED;
}
struct irqaction ip6_irqaction = {
.handler = ip6_action,
.name = "cascade",
.flags = IRQF_SHARED,
};
struct irqaction cascade_irqaction = {
.handler = no_action,
.name = "cascade",
};
void __init mach_init_irq(void)
{
/* init all controller
* 0-15 ------> i8259 interrupt
* 16-23 ------> mips cpu interrupt
* 32-63 ------> bonito irq
*/
/* setup cs5536 as high level trigger */
LOONGSON_INTPOL = LOONGSON_INT_BIT_INT0 | LOONGSON_INT_BIT_INT1;
LOONGSON_INTEDGE &= ~(LOONGSON_INT_BIT_INT0 | LOONGSON_INT_BIT_INT1);
/* Sets the first-level interrupt dispatcher. */
mips_cpu_irq_init();
init_i8259_irqs();
bonito_irq_init();
/* setup north bridge irq (bonito) */
setup_irq(LOONGSON_NORTH_BRIDGE_IRQ, &ip6_irqaction);
/* setup source bridge irq (i8259) */
setup_irq(LOONGSON_SOUTH_BRIDGE_IRQ, &cascade_irqaction);
}
|
