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
162
163
164
165
166
167
|
/* linux/arch/arm/mach-s3c2410/bast-irq.c
*
* Copyright (c) 2003,2005 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* http://www.simtec.co.uk/products/EB2410ITX/
*
* 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
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/sysdev.h>
#include <asm/mach-types.h>
#include <asm/arch/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/arch/regs-irq.h>
#include <asm/arch/bast-map.h>
#include <asm/arch/bast-irq.h>
#include <asm/plat-s3c24xx/irq.h>
#if 0
#include <asm/debug-ll.h>
#endif
#define irqdbf(x...)
#define irqdbf2(x...)
/* handle PC104 ISA interrupts from the system CPLD */
/* table of ISA irq nos to the relevant mask... zero means
* the irq is not implemented
*/
static unsigned char bast_pc104_irqmasks[] = {
0, /* 0 */
0, /* 1 */
0, /* 2 */
1, /* 3 */
0, /* 4 */
2, /* 5 */
0, /* 6 */
4, /* 7 */
0, /* 8 */
0, /* 9 */
8, /* 10 */
0, /* 11 */
0, /* 12 */
0, /* 13 */
0, /* 14 */
0, /* 15 */
};
static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
static void
bast_pc104_mask(unsigned int irqno)
{
unsigned long temp;
temp = __raw_readb(BAST_VA_PC104_IRQMASK);
temp &= ~bast_pc104_irqmasks[irqno];
__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
}
static void
bast_pc104_maskack(unsigned int irqno)
{
struct irq_desc *desc = irq_desc + IRQ_ISA;
bast_pc104_mask(irqno);
desc->chip->ack(IRQ_ISA);
}
static void
bast_pc104_unmask(unsigned int irqno)
{
unsigned long temp;
temp = __raw_readb(BAST_VA_PC104_IRQMASK);
temp |= bast_pc104_irqmasks[irqno];
__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
}
static struct irq_chip bast_pc104_chip = {
.mask = bast_pc104_mask,
.unmask = bast_pc104_unmask,
.ack = bast_pc104_maskack
};
static void
bast_irq_pc104_demux(unsigned int irq,
struct irq_desc *desc)
{
unsigned int stat;
unsigned int irqno;
int i;
stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
if (unlikely(stat == 0)) {
/* ack if we get an irq with nothing (ie, startup) */
desc = irq_desc + IRQ_ISA;
desc->chip->ack(IRQ_ISA);
} else {
/* handle the IRQ */
for (i = 0; stat != 0; i++, stat >>= 1) {
if (stat & 1) {
irqno = bast_pc104_irqs[i];
desc = irq_desc + irqno;
desc_handle_irq(irqno, desc);
}
}
}
}
static __init int bast_irq_init(void)
{
unsigned int i;
if (machine_is_bast()) {
printk(KERN_INFO "BAST PC104 IRQ routing, (c) 2005 Simtec Electronics\n");
/* zap all the IRQs */
__raw_writeb(0x0, BAST_VA_PC104_IRQMASK);
set_irq_chained_handler(IRQ_ISA, bast_irq_pc104_demux);
/* register our IRQs */
for (i = 0; i < 4; i++) {
unsigned int irqno = bast_pc104_irqs[i];
set_irq_chip(irqno, &bast_pc104_chip);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
}
return 0;
}
arch_initcall(bast_irq_init);
|
