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1da177e4 LT |
1 | /* linux/arch/arm/mach-s3c2410/bast-irq.c |
2 | * | |
ccae941e | 3 | * Copyright 2003-2005 Simtec Electronics |
1da177e4 LT |
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 | |
bafa49cc | 21 | */ |
1da177e4 LT |
22 | |
23 | ||
24 | #include <linux/init.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/ioport.h> | |
1da177e4 | 27 | #include <linux/sysdev.h> |
fced80c7 | 28 | #include <linux/io.h> |
1da177e4 | 29 | |
bafa49cc BD |
30 | #include <asm/mach-types.h> |
31 | ||
a09e64fb | 32 | #include <mach/hardware.h> |
1da177e4 | 33 | #include <asm/irq.h> |
1da177e4 LT |
34 | |
35 | #include <asm/mach/irq.h> | |
bafa49cc | 36 | |
a09e64fb RK |
37 | #include <mach/regs-irq.h> |
38 | #include <mach/bast-map.h> | |
39 | #include <mach/bast-irq.h> | |
bafa49cc | 40 | |
a2b7ba9c | 41 | #include <plat/irq.h> |
1da177e4 LT |
42 | |
43 | #if 0 | |
44 | #include <asm/debug-ll.h> | |
45 | #endif | |
46 | ||
47 | #define irqdbf(x...) | |
48 | #define irqdbf2(x...) | |
49 | ||
50 | ||
51 | /* handle PC104 ISA interrupts from the system CPLD */ | |
52 | ||
53 | /* table of ISA irq nos to the relevant mask... zero means | |
54 | * the irq is not implemented | |
55 | */ | |
56 | static unsigned char bast_pc104_irqmasks[] = { | |
57 | 0, /* 0 */ | |
58 | 0, /* 1 */ | |
59 | 0, /* 2 */ | |
60 | 1, /* 3 */ | |
61 | 0, /* 4 */ | |
62 | 2, /* 5 */ | |
63 | 0, /* 6 */ | |
64 | 4, /* 7 */ | |
65 | 0, /* 8 */ | |
66 | 0, /* 9 */ | |
67 | 8, /* 10 */ | |
68 | 0, /* 11 */ | |
69 | 0, /* 12 */ | |
70 | 0, /* 13 */ | |
71 | 0, /* 14 */ | |
72 | 0, /* 15 */ | |
73 | }; | |
74 | ||
75 | static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 }; | |
76 | ||
77 | static void | |
57436c2d | 78 | bast_pc104_mask(struct irq_data *data) |
1da177e4 LT |
79 | { |
80 | unsigned long temp; | |
81 | ||
82 | temp = __raw_readb(BAST_VA_PC104_IRQMASK); | |
57436c2d | 83 | temp &= ~bast_pc104_irqmasks[data->irq]; |
1da177e4 | 84 | __raw_writeb(temp, BAST_VA_PC104_IRQMASK); |
1da177e4 LT |
85 | } |
86 | ||
87 | static void | |
57436c2d | 88 | bast_pc104_maskack(struct irq_data *data) |
1da177e4 | 89 | { |
10dd5ce2 | 90 | struct irq_desc *desc = irq_desc + IRQ_ISA; |
bafa49cc | 91 | |
57436c2d LB |
92 | bast_pc104_mask(data); |
93 | desc->irq_data.chip->irq_ack(&desc->irq_data); | |
1da177e4 LT |
94 | } |
95 | ||
96 | static void | |
57436c2d | 97 | bast_pc104_unmask(struct irq_data *data) |
1da177e4 LT |
98 | { |
99 | unsigned long temp; | |
100 | ||
101 | temp = __raw_readb(BAST_VA_PC104_IRQMASK); | |
57436c2d | 102 | temp |= bast_pc104_irqmasks[data->irq]; |
1da177e4 | 103 | __raw_writeb(temp, BAST_VA_PC104_IRQMASK); |
1da177e4 LT |
104 | } |
105 | ||
10dd5ce2 | 106 | static struct irq_chip bast_pc104_chip = { |
57436c2d LB |
107 | .irq_mask = bast_pc104_mask, |
108 | .irq_unmask = bast_pc104_unmask, | |
109 | .irq_ack = bast_pc104_maskack | |
1da177e4 LT |
110 | }; |
111 | ||
112 | static void | |
113 | bast_irq_pc104_demux(unsigned int irq, | |
10dd5ce2 | 114 | struct irq_desc *desc) |
1da177e4 LT |
115 | { |
116 | unsigned int stat; | |
117 | unsigned int irqno; | |
118 | int i; | |
119 | ||
120 | stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf; | |
121 | ||
bafa49cc BD |
122 | if (unlikely(stat == 0)) { |
123 | /* ack if we get an irq with nothing (ie, startup) */ | |
124 | ||
125 | desc = irq_desc + IRQ_ISA; | |
57436c2d | 126 | desc->irq_data.chip->irq_ack(&desc->irq_data); |
bafa49cc BD |
127 | } else { |
128 | /* handle the IRQ */ | |
129 | ||
130 | for (i = 0; stat != 0; i++, stat >>= 1) { | |
131 | if (stat & 1) { | |
132 | irqno = bast_pc104_irqs[i]; | |
d8aa0251 | 133 | generic_handle_irq(irqno); |
bafa49cc | 134 | } |
1da177e4 | 135 | } |
bafa49cc BD |
136 | } |
137 | } | |
1da177e4 | 138 | |
bafa49cc BD |
139 | static __init int bast_irq_init(void) |
140 | { | |
141 | unsigned int i; | |
142 | ||
143 | if (machine_is_bast()) { | |
50f430e3 | 144 | printk(KERN_INFO "BAST PC104 IRQ routing, Copyright 2005 Simtec Electronics\n"); |
bafa49cc BD |
145 | |
146 | /* zap all the IRQs */ | |
147 | ||
148 | __raw_writeb(0x0, BAST_VA_PC104_IRQMASK); | |
149 | ||
6845664a | 150 | irq_set_chained_handler(IRQ_ISA, bast_irq_pc104_demux); |
bafa49cc | 151 | |
544b46de | 152 | /* register our IRQs */ |
bafa49cc BD |
153 | |
154 | for (i = 0; i < 4; i++) { | |
155 | unsigned int irqno = bast_pc104_irqs[i]; | |
156 | ||
f38c02f3 TG |
157 | irq_set_chip_and_handler(irqno, &bast_pc104_chip, |
158 | handle_level_irq); | |
bafa49cc BD |
159 | set_irq_flags(irqno, IRQF_VALID); |
160 | } | |
1da177e4 | 161 | } |
bafa49cc BD |
162 | |
163 | return 0; | |
1da177e4 | 164 | } |
bafa49cc BD |
165 | |
166 | arch_initcall(bast_irq_init); |