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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> | |
21 | ||
22 | #include <asm/mach/irq.h> | |
23 | ||
24 | #include <asm/hardware.h> | |
25 | #include <asm/hardware/dec21285.h> | |
26 | #include <asm/irq.h> | |
27 | #include <asm/io.h> | |
28 | #include <asm/mach-types.h> | |
29 | ||
30 | static void isa_mask_pic_lo_irq(unsigned int irq) | |
31 | { | |
32 | unsigned int mask = 1 << (irq & 7); | |
33 | ||
34 | outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); | |
35 | } | |
36 | ||
37 | static void isa_ack_pic_lo_irq(unsigned int irq) | |
38 | { | |
39 | unsigned int mask = 1 << (irq & 7); | |
40 | ||
41 | outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); | |
42 | outb(0x20, PIC_LO); | |
43 | } | |
44 | ||
45 | static void isa_unmask_pic_lo_irq(unsigned int irq) | |
46 | { | |
47 | unsigned int mask = 1 << (irq & 7); | |
48 | ||
49 | outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO); | |
50 | } | |
51 | ||
52 | static struct irqchip isa_lo_chip = { | |
53 | .ack = isa_ack_pic_lo_irq, | |
54 | .mask = isa_mask_pic_lo_irq, | |
55 | .unmask = isa_unmask_pic_lo_irq, | |
56 | }; | |
57 | ||
58 | static void isa_mask_pic_hi_irq(unsigned int irq) | |
59 | { | |
60 | unsigned int mask = 1 << (irq & 7); | |
61 | ||
62 | outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); | |
63 | } | |
64 | ||
65 | static void isa_ack_pic_hi_irq(unsigned int irq) | |
66 | { | |
67 | unsigned int mask = 1 << (irq & 7); | |
68 | ||
69 | outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); | |
70 | outb(0x62, PIC_LO); | |
71 | outb(0x20, PIC_HI); | |
72 | } | |
73 | ||
74 | static void isa_unmask_pic_hi_irq(unsigned int irq) | |
75 | { | |
76 | unsigned int mask = 1 << (irq & 7); | |
77 | ||
78 | outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI); | |
79 | } | |
80 | ||
81 | static struct irqchip isa_hi_chip = { | |
82 | .ack = isa_ack_pic_hi_irq, | |
83 | .mask = isa_mask_pic_hi_irq, | |
84 | .unmask = isa_unmask_pic_hi_irq, | |
85 | }; | |
86 | ||
87 | static void | |
88 | isa_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) | |
89 | { | |
90 | unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE; | |
91 | ||
92 | if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) { | |
93 | do_bad_IRQ(isa_irq, desc, regs); | |
94 | return; | |
95 | } | |
96 | ||
97 | desc = irq_desc + isa_irq; | |
664399e1 | 98 | desc_handle_irq(isa_irq, desc, regs); |
1da177e4 LT |
99 | } |
100 | ||
101 | static struct irqaction irq_cascade = { .handler = no_action, .name = "cascade", }; | |
102 | static struct resource pic1_resource = { "pic1", 0x20, 0x3f }; | |
103 | static struct resource pic2_resource = { "pic2", 0xa0, 0xbf }; | |
104 | ||
105 | void __init isa_init_irq(unsigned int host_irq) | |
106 | { | |
107 | unsigned int irq; | |
108 | ||
109 | /* | |
110 | * Setup, and then probe for an ISA PIC | |
111 | * If the PIC is not there, then we | |
112 | * ignore the PIC. | |
113 | */ | |
114 | outb(0x11, PIC_LO); | |
115 | outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */ | |
116 | outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */ | |
117 | outb(0x01, PIC_MASK_LO); /* x86 */ | |
118 | outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */ | |
119 | ||
120 | outb(0x11, PIC_HI); | |
121 | outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */ | |
122 | outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */ | |
123 | outb(0x01, PIC_MASK_HI); /* x86 */ | |
124 | outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */ | |
125 | ||
126 | outb(0x0b, PIC_LO); | |
127 | outb(0x0b, PIC_HI); | |
128 | ||
129 | if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) { | |
130 | outb(0xff, PIC_MASK_LO);/* mask all IRQs */ | |
131 | outb(0xff, PIC_MASK_HI);/* mask all IRQs */ | |
132 | } else { | |
133 | printk(KERN_INFO "IRQ: ISA PIC not found\n"); | |
134 | host_irq = (unsigned int)-1; | |
135 | } | |
136 | ||
137 | if (host_irq != (unsigned int)-1) { | |
138 | for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) { | |
139 | set_irq_chip(irq, &isa_lo_chip); | |
140 | set_irq_handler(irq, do_level_IRQ); | |
141 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
142 | } | |
143 | ||
144 | for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { | |
145 | set_irq_chip(irq, &isa_hi_chip); | |
146 | set_irq_handler(irq, do_level_IRQ); | |
147 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
148 | } | |
149 | ||
150 | request_resource(&ioport_resource, &pic1_resource); | |
151 | request_resource(&ioport_resource, &pic2_resource); | |
152 | setup_irq(IRQ_ISA_CASCADE, &irq_cascade); | |
153 | ||
154 | set_irq_chained_handler(host_irq, isa_irq_handler); | |
155 | ||
156 | /* | |
157 | * On the NetWinder, don't automatically | |
158 | * enable ISA IRQ11 when it is requested. | |
159 | * There appears to be a missing pull-up | |
160 | * resistor on this line. | |
161 | */ | |
162 | if (machine_is_netwinder()) | |
163 | set_irq_flags(_ISA_IRQ(11), IRQF_VALID | | |
164 | IRQF_PROBE | IRQF_NOAUTOEN); | |
165 | } | |
166 | } | |
167 | ||
168 |