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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-footbridge/irq.c | |
3 | * | |
4 | * Copyright (C) 1996-2000 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Changelog: | |
11 | * 22-Aug-1998 RMK Restructured IRQ routines | |
12 | * 03-Sep-1998 PJB Merged CATS support | |
13 | * 20-Jan-1998 RMK Started merge of EBSA286, CATS and NetWinder | |
14 | * 26-Jan-1999 PJB Don't use IACK on CATS | |
15 | * 16-Mar-1999 RMK Added autodetect of ISA PICs | |
16 | */ | |
17 | #include <linux/ioport.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/init.h> | |
fced80c7 | 21 | #include <linux/io.h> |
70d13e08 | 22 | #include <linux/spinlock.h> |
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23 | |
24 | #include <asm/mach/irq.h> | |
25 | ||
a09e64fb | 26 | #include <mach/hardware.h> |
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27 | #include <asm/hardware/dec21285.h> |
28 | #include <asm/irq.h> | |
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29 | #include <asm/mach-types.h> |
30 | ||
39ebfd3f BD |
31 | #include "common.h" |
32 | ||
dc2caf6c | 33 | static void isa_mask_pic_lo_irq(struct irq_data *d) |
1da177e4 | 34 | { |
dc2caf6c | 35 | unsigned int mask = 1 << (d->irq & 7); |
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36 | |
37 | outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); | |
38 | } | |
39 | ||
dc2caf6c | 40 | static void isa_ack_pic_lo_irq(struct irq_data *d) |
1da177e4 | 41 | { |
dc2caf6c | 42 | unsigned int mask = 1 << (d->irq & 7); |
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43 | |
44 | outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); | |
45 | outb(0x20, PIC_LO); | |
46 | } | |
47 | ||
dc2caf6c | 48 | static void isa_unmask_pic_lo_irq(struct irq_data *d) |
1da177e4 | 49 | { |
dc2caf6c | 50 | unsigned int mask = 1 << (d->irq & 7); |
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51 | |
52 | outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO); | |
53 | } | |
54 | ||
10dd5ce2 | 55 | static struct irq_chip isa_lo_chip = { |
dc2caf6c LB |
56 | .irq_ack = isa_ack_pic_lo_irq, |
57 | .irq_mask = isa_mask_pic_lo_irq, | |
58 | .irq_unmask = isa_unmask_pic_lo_irq, | |
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59 | }; |
60 | ||
dc2caf6c | 61 | static void isa_mask_pic_hi_irq(struct irq_data *d) |
1da177e4 | 62 | { |
dc2caf6c | 63 | unsigned int mask = 1 << (d->irq & 7); |
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64 | |
65 | outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); | |
66 | } | |
67 | ||
dc2caf6c | 68 | static void isa_ack_pic_hi_irq(struct irq_data *d) |
1da177e4 | 69 | { |
dc2caf6c | 70 | unsigned int mask = 1 << (d->irq & 7); |
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71 | |
72 | outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); | |
73 | outb(0x62, PIC_LO); | |
74 | outb(0x20, PIC_HI); | |
75 | } | |
76 | ||
dc2caf6c | 77 | static void isa_unmask_pic_hi_irq(struct irq_data *d) |
1da177e4 | 78 | { |
dc2caf6c | 79 | unsigned int mask = 1 << (d->irq & 7); |
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80 | |
81 | outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI); | |
82 | } | |
83 | ||
10dd5ce2 | 84 | static struct irq_chip isa_hi_chip = { |
dc2caf6c LB |
85 | .irq_ack = isa_ack_pic_hi_irq, |
86 | .irq_mask = isa_mask_pic_hi_irq, | |
87 | .irq_unmask = isa_unmask_pic_hi_irq, | |
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88 | }; |
89 | ||
bd0b9ac4 | 90 | static void isa_irq_handler(struct irq_desc *desc) |
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91 | { |
92 | unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE; | |
93 | ||
94 | if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) { | |
bd0b9ac4 | 95 | do_bad_IRQ(desc); |
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96 | return; |
97 | } | |
98 | ||
d8aa0251 | 99 | generic_handle_irq(isa_irq); |
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100 | } |
101 | ||
020732ad RK |
102 | static struct irqaction irq_cascade = { |
103 | .handler = no_action, | |
104 | .name = "cascade", | |
105 | }; | |
106 | ||
107 | static struct resource pic1_resource = { | |
108 | .name = "pic1", | |
109 | .start = 0x20, | |
110 | .end = 0x3f, | |
111 | }; | |
112 | ||
113 | static struct resource pic2_resource = { | |
114 | .name = "pic2", | |
115 | .start = 0xa0, | |
116 | .end = 0xbf, | |
117 | }; | |
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118 | |
119 | void __init isa_init_irq(unsigned int host_irq) | |
120 | { | |
121 | unsigned int irq; | |
122 | ||
123 | /* | |
124 | * Setup, and then probe for an ISA PIC | |
125 | * If the PIC is not there, then we | |
126 | * ignore the PIC. | |
127 | */ | |
128 | outb(0x11, PIC_LO); | |
129 | outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */ | |
130 | outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */ | |
131 | outb(0x01, PIC_MASK_LO); /* x86 */ | |
132 | outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */ | |
133 | ||
134 | outb(0x11, PIC_HI); | |
135 | outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */ | |
136 | outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */ | |
137 | outb(0x01, PIC_MASK_HI); /* x86 */ | |
138 | outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */ | |
139 | ||
140 | outb(0x0b, PIC_LO); | |
141 | outb(0x0b, PIC_HI); | |
142 | ||
143 | if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) { | |
144 | outb(0xff, PIC_MASK_LO);/* mask all IRQs */ | |
145 | outb(0xff, PIC_MASK_HI);/* mask all IRQs */ | |
146 | } else { | |
147 | printk(KERN_INFO "IRQ: ISA PIC not found\n"); | |
148 | host_irq = (unsigned int)-1; | |
149 | } | |
150 | ||
151 | if (host_irq != (unsigned int)-1) { | |
152 | for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) { | |
f38c02f3 TG |
153 | irq_set_chip_and_handler(irq, &isa_lo_chip, |
154 | handle_level_irq); | |
e8d36d5d | 155 | irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
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156 | } |
157 | ||
158 | for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { | |
f38c02f3 TG |
159 | irq_set_chip_and_handler(irq, &isa_hi_chip, |
160 | handle_level_irq); | |
e8d36d5d | 161 | irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
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162 | } |
163 | ||
164 | request_resource(&ioport_resource, &pic1_resource); | |
165 | request_resource(&ioport_resource, &pic2_resource); | |
166 | setup_irq(IRQ_ISA_CASCADE, &irq_cascade); | |
167 | ||
6845664a | 168 | irq_set_chained_handler(host_irq, isa_irq_handler); |
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169 | |
170 | /* | |
171 | * On the NetWinder, don't automatically | |
172 | * enable ISA IRQ11 when it is requested. | |
173 | * There appears to be a missing pull-up | |
174 | * resistor on this line. | |
175 | */ | |
176 | if (machine_is_netwinder()) | |
e8d36d5d RH |
177 | irq_modify_status(_ISA_IRQ(11), |
178 | IRQ_NOREQUEST | IRQ_NOPROBE, IRQ_NOAUTOEN); | |
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179 | } |
180 | } | |
181 | ||
182 |