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1 | /* linux/arch/arm/mach-s3c2410/bast-irq.c |
2 | * | |
bafa49cc | 3 | * Copyright (c) 2003,2005 Simtec Electronics |
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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 | * Modifications: | |
23 | * 08-Jan-2003 BJD Moved from central IRQ code | |
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24 | * 21-Aug-2005 BJD Fixed missing code and compile errors |
25 | */ | |
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26 | |
27 | ||
28 | #include <linux/init.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/ioport.h> | |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/sysdev.h> | |
33 | ||
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34 | #include <asm/mach-types.h> |
35 | ||
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36 | #include <asm/hardware.h> |
37 | #include <asm/irq.h> | |
38 | #include <asm/io.h> | |
39 | ||
40 | #include <asm/mach/irq.h> | |
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41 | |
42 | #include <asm/arch/regs-irq.h> | |
43 | #include <asm/arch/bast-map.h> | |
44 | #include <asm/arch/bast-irq.h> | |
45 | ||
46 | #include "irq.h" | |
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47 | |
48 | #if 0 | |
49 | #include <asm/debug-ll.h> | |
50 | #endif | |
51 | ||
52 | #define irqdbf(x...) | |
53 | #define irqdbf2(x...) | |
54 | ||
55 | ||
56 | /* handle PC104 ISA interrupts from the system CPLD */ | |
57 | ||
58 | /* table of ISA irq nos to the relevant mask... zero means | |
59 | * the irq is not implemented | |
60 | */ | |
61 | static unsigned char bast_pc104_irqmasks[] = { | |
62 | 0, /* 0 */ | |
63 | 0, /* 1 */ | |
64 | 0, /* 2 */ | |
65 | 1, /* 3 */ | |
66 | 0, /* 4 */ | |
67 | 2, /* 5 */ | |
68 | 0, /* 6 */ | |
69 | 4, /* 7 */ | |
70 | 0, /* 8 */ | |
71 | 0, /* 9 */ | |
72 | 8, /* 10 */ | |
73 | 0, /* 11 */ | |
74 | 0, /* 12 */ | |
75 | 0, /* 13 */ | |
76 | 0, /* 14 */ | |
77 | 0, /* 15 */ | |
78 | }; | |
79 | ||
80 | static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 }; | |
81 | ||
82 | static void | |
83 | bast_pc104_mask(unsigned int irqno) | |
84 | { | |
85 | unsigned long temp; | |
86 | ||
87 | temp = __raw_readb(BAST_VA_PC104_IRQMASK); | |
88 | temp &= ~bast_pc104_irqmasks[irqno]; | |
89 | __raw_writeb(temp, BAST_VA_PC104_IRQMASK); | |
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90 | } |
91 | ||
92 | static void | |
bafa49cc | 93 | bast_pc104_maskack(unsigned int irqno) |
1da177e4 | 94 | { |
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95 | struct irqdesc *desc = irq_desc + IRQ_ISA; |
96 | ||
97 | bast_pc104_mask(irqno); | |
98 | desc->chip->ack(IRQ_ISA); | |
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99 | } |
100 | ||
101 | static void | |
102 | bast_pc104_unmask(unsigned int irqno) | |
103 | { | |
104 | unsigned long temp; | |
105 | ||
106 | temp = __raw_readb(BAST_VA_PC104_IRQMASK); | |
107 | temp |= bast_pc104_irqmasks[irqno]; | |
108 | __raw_writeb(temp, BAST_VA_PC104_IRQMASK); | |
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109 | } |
110 | ||
bafa49cc | 111 | static struct irqchip bast_pc104_chip = { |
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112 | .mask = bast_pc104_mask, |
113 | .unmask = bast_pc104_unmask, | |
bafa49cc | 114 | .ack = bast_pc104_maskack |
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115 | }; |
116 | ||
117 | static void | |
118 | bast_irq_pc104_demux(unsigned int irq, | |
119 | struct irqdesc *desc, | |
120 | struct pt_regs *regs) | |
121 | { | |
122 | unsigned int stat; | |
123 | unsigned int irqno; | |
124 | int i; | |
125 | ||
126 | stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf; | |
127 | ||
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128 | if (unlikely(stat == 0)) { |
129 | /* ack if we get an irq with nothing (ie, startup) */ | |
130 | ||
131 | desc = irq_desc + IRQ_ISA; | |
132 | desc->chip->ack(IRQ_ISA); | |
133 | } else { | |
134 | /* handle the IRQ */ | |
135 | ||
136 | for (i = 0; stat != 0; i++, stat >>= 1) { | |
137 | if (stat & 1) { | |
138 | irqno = bast_pc104_irqs[i]; | |
1da177e4 | 139 | |
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140 | desc_handle_irq(irqno, irq_desc + irqno, regs); |
141 | } | |
1da177e4 | 142 | } |
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143 | } |
144 | } | |
1da177e4 | 145 | |
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146 | static __init int bast_irq_init(void) |
147 | { | |
148 | unsigned int i; | |
149 | ||
150 | if (machine_is_bast()) { | |
151 | printk(KERN_INFO "BAST PC104 IRQ routing, (c) 2005 Simtec Electronics\n"); | |
152 | ||
153 | /* zap all the IRQs */ | |
154 | ||
155 | __raw_writeb(0x0, BAST_VA_PC104_IRQMASK); | |
156 | ||
157 | set_irq_chained_handler(IRQ_ISA, bast_irq_pc104_demux); | |
158 | ||
159 | /* reigster our IRQs */ | |
160 | ||
161 | for (i = 0; i < 4; i++) { | |
162 | unsigned int irqno = bast_pc104_irqs[i]; | |
163 | ||
164 | set_irq_chip(irqno, &bast_pc104_chip); | |
165 | set_irq_handler(irqno, do_level_IRQ); | |
166 | set_irq_flags(irqno, IRQF_VALID); | |
167 | } | |
1da177e4 | 168 | } |
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169 | |
170 | return 0; | |
1da177e4 | 171 | } |
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172 | |
173 | arch_initcall(bast_irq_init); |