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
|
/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* ########################################################################
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* ########################################################################
*
* Routines for generic manipulation of the interrupts found on the MIPS
* Atlas board.
*
*/
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mips-boards/atlas.h>
#include <asm/mips-boards/atlasint.h>
#include <asm/gdb-stub.h>
static struct atlas_ictrl_regs *atlas_hw0_icregs;
extern asmlinkage void mipsIRQ(void);
#if 0
#define DEBUG_INT(x...) printk(x)
#else
#define DEBUG_INT(x...)
#endif
void disable_atlas_irq(unsigned int irq_nr)
{
atlas_hw0_icregs->intrsten = (1 << (irq_nr-ATLASINT_BASE));
iob();
}
void enable_atlas_irq(unsigned int irq_nr)
{
atlas_hw0_icregs->intseten = (1 << (irq_nr-ATLASINT_BASE));
iob();
}
static unsigned int startup_atlas_irq(unsigned int irq)
{
enable_atlas_irq(irq);
return 0; /* never anything pending */
}
#define shutdown_atlas_irq disable_atlas_irq
#define mask_and_ack_atlas_irq disable_atlas_irq
static void end_atlas_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_atlas_irq(irq);
}
static struct hw_interrupt_type atlas_irq_type = {
.typename = "Atlas",
.startup = startup_atlas_irq,
.shutdown = shutdown_atlas_irq,
.enable = enable_atlas_irq,
.disable = disable_atlas_irq,
.ack = mask_and_ack_atlas_irq,
.end = end_atlas_irq,
};
static inline int ls1bit32(unsigned int x)
{
int b = 31, s;
s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
s = 1; if (x << 1 == 0) s = 0; b -= s;
return b;
}
void atlas_hw0_irqdispatch(struct pt_regs *regs)
{
unsigned long int_status;
int irq;
int_status = atlas_hw0_icregs->intstatus;
/* if int_status == 0, then the interrupt has already been cleared */
if (unlikely(int_status == 0))
return;
irq = ATLASINT_BASE + ls1bit32(int_status);
DEBUG_INT("atlas_hw0_irqdispatch: irq=%d\n", irq);
do_IRQ(irq, regs);
}
void __init arch_init_irq(void)
{
int i;
atlas_hw0_icregs = (struct atlas_ictrl_regs *)ioremap (ATLAS_ICTRL_REGS_BASE, sizeof(struct atlas_ictrl_regs *));
/*
* Mask out all interrupt by writing "1" to all bit position in
* the interrupt reset reg.
*/
atlas_hw0_icregs->intrsten = 0xffffffff;
/* Now safe to set the exception vector. */
set_except_vector(0, mipsIRQ);
for (i = ATLASINT_BASE; i <= ATLASINT_END; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 1;
irq_desc[i].handler = &atlas_irq_type;
spin_lock_init(&irq_desc[i].lock);
}
}
|
