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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* (C) Copyright 2009
* Graeme Russ, <graeme.russ@gmail.com>
*
* (C) Copyright 2007
* Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
*
* (C) Copyright 2006
* Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
*
* (C) Copyright -2003
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* (C) Copyright 2001
* Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that 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
*/
/*
* This file contains the high-level API for the interrupt sub-system
* of the x86 port of U-Boot. Most of the functionality has been
* shamelessly stolen from the leon2 / leon3 ports of U-Boot.
* Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
* credited for the corresponding work on those ports. The original
* interrupt handling routines for the x86 port were written by
* Daniel Engström
*/
#include <common.h>
#include <asm/interrupt.h>
struct irq_action {
interrupt_handler_t *handler;
void *arg;
unsigned int count;
};
static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
static int spurious_irq_cnt;
static int spurious_irq;
void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
{
int status;
if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
printf("irq_install_handler: bad irq number %d\n", irq);
return;
}
if (irq_handlers[irq].handler != NULL)
printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
(ulong) handler,
(ulong) irq_handlers[irq].handler);
status = disable_interrupts();
irq_handlers[irq].handler = handler;
irq_handlers[irq].arg = arg;
irq_handlers[irq].count = 0;
unmask_irq(irq);
if (status)
enable_interrupts();
return;
}
void irq_free_handler(int irq)
{
int status;
if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
printf("irq_free_handler: bad irq number %d\n", irq);
return;
}
status = disable_interrupts();
mask_irq(irq);
irq_handlers[irq].handler = NULL;
irq_handlers[irq].arg = NULL;
if (status)
enable_interrupts();
return;
}
void do_irq(int hw_irq)
{
int irq = hw_irq - 0x20;
if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
printf("do_irq: bad irq number %d\n", irq);
return;
}
if (irq_handlers[irq].handler) {
mask_irq(irq);
irq_handlers[irq].handler(irq_handlers[irq].arg);
irq_handlers[irq].count++;
unmask_irq(irq);
specific_eoi(irq);
} else {
if ((irq & 7) != 7) {
spurious_irq_cnt++;
spurious_irq = irq;
}
}
}
#if defined(CONFIG_CMD_IRQ)
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int irq;
printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
spurious_irq_cnt, spurious_irq);
printf("Interrupt-Information:\n");
printf("Nr Routine Arg Count\n");
for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
if (irq_handlers[irq].handler != NULL) {
printf("%02d %08lx %08lx %d\n",
irq,
(ulong)irq_handlers[irq].handler,
(ulong)irq_handlers[irq].arg,
irq_handlers[irq].count);
}
}
return 0;
}
#endif
|
