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1/* linux/arch/arm/mach-s3c2410/bast-irq.c
2 *
3 * Copyright 2003-2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * http://www.simtec.co.uk/products/EB2410ITX/
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21*/
22
23
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/ioport.h>
27#include <linux/device.h>
28#include <linux/io.h>
29
30#include <asm/irq.h>
31#include <asm/mach-types.h>
32#include <asm/mach/irq.h>
33
34#include <mach/hardware.h>
35#include <mach/regs-irq.h>
36
37#include "bast.h"
38
39#define irqdbf(x...)
40#define irqdbf2(x...)
41
42/* handle PC104 ISA interrupts from the system CPLD */
43
44/* table of ISA irq nos to the relevant mask... zero means
45 * the irq is not implemented
46*/
47static unsigned char bast_pc104_irqmasks[] = {
48 0, /* 0 */
49 0, /* 1 */
50 0, /* 2 */
51 1, /* 3 */
52 0, /* 4 */
53 2, /* 5 */
54 0, /* 6 */
55 4, /* 7 */
56 0, /* 8 */
57 0, /* 9 */
58 8, /* 10 */
59 0, /* 11 */
60 0, /* 12 */
61 0, /* 13 */
62 0, /* 14 */
63 0, /* 15 */
64};
65
66static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
67
68static void
69bast_pc104_mask(struct irq_data *data)
70{
71 unsigned long temp;
72
73 temp = __raw_readb(BAST_VA_PC104_IRQMASK);
74 temp &= ~bast_pc104_irqmasks[data->irq];
75 __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
76}
77
78static void
79bast_pc104_maskack(struct irq_data *data)
80{
81 struct irq_desc *desc = irq_desc + BAST_IRQ_ISA;
82
83 bast_pc104_mask(data);
84 desc->irq_data.chip->irq_ack(&desc->irq_data);
85}
86
87static void
88bast_pc104_unmask(struct irq_data *data)
89{
90 unsigned long temp;
91
92 temp = __raw_readb(BAST_VA_PC104_IRQMASK);
93 temp |= bast_pc104_irqmasks[data->irq];
94 __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
95}
96
97static struct irq_chip bast_pc104_chip = {
98 .irq_mask = bast_pc104_mask,
99 .irq_unmask = bast_pc104_unmask,
100 .irq_ack = bast_pc104_maskack
101};
102
103static void
104bast_irq_pc104_demux(unsigned int irq,
105 struct irq_desc *desc)
106{
107 unsigned int stat;
108 unsigned int irqno;
109 int i;
110
111 stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
112
113 if (unlikely(stat == 0)) {
114 /* ack if we get an irq with nothing (ie, startup) */
115
116 desc = irq_desc + BAST_IRQ_ISA;
117 desc->irq_data.chip->irq_ack(&desc->irq_data);
118 } else {
119 /* handle the IRQ */
120
121 for (i = 0; stat != 0; i++, stat >>= 1) {
122 if (stat & 1) {
123 irqno = bast_pc104_irqs[i];
124 generic_handle_irq(irqno);
125 }
126 }
127 }
128}
129
130static __init int bast_irq_init(void)
131{
132 unsigned int i;
133
134 if (machine_is_bast()) {
135 printk(KERN_INFO "BAST PC104 IRQ routing, Copyright 2005 Simtec Electronics\n");
136
137 /* zap all the IRQs */
138
139 __raw_writeb(0x0, BAST_VA_PC104_IRQMASK);
140
141 irq_set_chained_handler(BAST_IRQ_ISA, bast_irq_pc104_demux);
142
143 /* register our IRQs */
144
145 for (i = 0; i < 4; i++) {
146 unsigned int irqno = bast_pc104_irqs[i];
147
148 irq_set_chip_and_handler(irqno, &bast_pc104_chip,
149 handle_level_irq);
150 set_irq_flags(irqno, IRQF_VALID);
151 }
152 }
153
154 return 0;
155}
156
157arch_initcall(bast_irq_init);
1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright 2003-2005 Simtec Electronics
4// Ben Dooks <ben@simtec.co.uk>
5//
6// http://www.simtec.co.uk/products/EB2410ITX/
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/ioport.h>
11#include <linux/device.h>
12#include <linux/io.h>
13
14#include <asm/irq.h>
15#include <asm/mach-types.h>
16#include <asm/mach/irq.h>
17
18#include <mach/hardware.h>
19#include <mach/regs-irq.h>
20
21#include "bast.h"
22
23#define irqdbf(x...)
24#define irqdbf2(x...)
25
26/* handle PC104 ISA interrupts from the system CPLD */
27
28/* table of ISA irq nos to the relevant mask... zero means
29 * the irq is not implemented
30*/
31static const unsigned char bast_pc104_irqmasks[] = {
32 0, /* 0 */
33 0, /* 1 */
34 0, /* 2 */
35 1, /* 3 */
36 0, /* 4 */
37 2, /* 5 */
38 0, /* 6 */
39 4, /* 7 */
40 0, /* 8 */
41 0, /* 9 */
42 8, /* 10 */
43 0, /* 11 */
44 0, /* 12 */
45 0, /* 13 */
46 0, /* 14 */
47 0, /* 15 */
48};
49
50static const unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
51
52static void
53bast_pc104_mask(struct irq_data *data)
54{
55 unsigned long temp;
56
57 temp = __raw_readb(BAST_VA_PC104_IRQMASK);
58 temp &= ~bast_pc104_irqmasks[data->irq];
59 __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
60}
61
62static void
63bast_pc104_maskack(struct irq_data *data)
64{
65 struct irq_desc *desc = irq_desc + BAST_IRQ_ISA;
66
67 bast_pc104_mask(data);
68 desc->irq_data.chip->irq_ack(&desc->irq_data);
69}
70
71static void
72bast_pc104_unmask(struct irq_data *data)
73{
74 unsigned long temp;
75
76 temp = __raw_readb(BAST_VA_PC104_IRQMASK);
77 temp |= bast_pc104_irqmasks[data->irq];
78 __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
79}
80
81static struct irq_chip bast_pc104_chip = {
82 .irq_mask = bast_pc104_mask,
83 .irq_unmask = bast_pc104_unmask,
84 .irq_ack = bast_pc104_maskack
85};
86
87static void bast_irq_pc104_demux(struct irq_desc *desc)
88{
89 unsigned int stat;
90 unsigned int irqno;
91 int i;
92
93 stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
94
95 if (unlikely(stat == 0)) {
96 /* ack if we get an irq with nothing (ie, startup) */
97
98 desc = irq_desc + BAST_IRQ_ISA;
99 desc->irq_data.chip->irq_ack(&desc->irq_data);
100 } else {
101 /* handle the IRQ */
102
103 for (i = 0; stat != 0; i++, stat >>= 1) {
104 if (stat & 1) {
105 irqno = bast_pc104_irqs[i];
106 generic_handle_irq(irqno);
107 }
108 }
109 }
110}
111
112static __init int bast_irq_init(void)
113{
114 unsigned int i;
115
116 if (machine_is_bast()) {
117 printk(KERN_INFO "BAST PC104 IRQ routing, Copyright 2005 Simtec Electronics\n");
118
119 /* zap all the IRQs */
120
121 __raw_writeb(0x0, BAST_VA_PC104_IRQMASK);
122
123 irq_set_chained_handler(BAST_IRQ_ISA, bast_irq_pc104_demux);
124
125 /* register our IRQs */
126
127 for (i = 0; i < 4; i++) {
128 unsigned int irqno = bast_pc104_irqs[i];
129
130 irq_set_chip_and_handler(irqno, &bast_pc104_chip,
131 handle_level_irq);
132 irq_clear_status_flags(irqno, IRQ_NOREQUEST);
133 }
134 }
135
136 return 0;
137}
138
139arch_initcall(bast_irq_init);