tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/arm26/mach-arc/irq.c
3 *
4 * Copyright (C) 1996 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 * 24-09-1996 RMK Created
12 * 10-10-1996 RMK Brought up to date with arch-sa110eval
13 * 22-10-1996 RMK Changed interrupt numbers & uses new inb/outb macros
14 * 11-01-1998 RMK Added mask_and_ack_irq
15 * 22-08-1998 RMK Restructured IRQ routines
16 * 08-09-2002 IM Brought up to date for 2.5
17 * 01-06-2003 JMA Removed arc_fiq_chip
18 */
19#include <linux/init.h>
20
21#include <asm/irq.h>
22#include <asm/irqchip.h>
23#include <asm/ioc.h>
24#include <asm/io.h>
25#include <asm/system.h>
26
27extern void init_FIQ(void);
28
29#define a_clf() clf()
30#define a_stf() stf()
31
32static void arc_ack_irq_a(unsigned int irq)
33{
34 unsigned int val, mask;
35
36 mask = 1 << irq;
37 a_clf();
38 val = ioc_readb(IOC_IRQMASKA);
39 ioc_writeb(val & ~mask, IOC_IRQMASKA);
40 ioc_writeb(mask, IOC_IRQCLRA);
41 a_stf();
42}
43
44static void arc_mask_irq_a(unsigned int irq)
45{
46 unsigned int val, mask;
47
48 mask = 1 << irq;
49 a_clf();
50 val = ioc_readb(IOC_IRQMASKA);
51 ioc_writeb(val & ~mask, IOC_IRQMASKA);
52 a_stf();
53}
54
55static void arc_unmask_irq_a(unsigned int irq)
56{
57 unsigned int val, mask;
58
59 mask = 1 << irq;
60 a_clf();
61 val = ioc_readb(IOC_IRQMASKA);
62 ioc_writeb(val | mask, IOC_IRQMASKA);
63 a_stf();
64}
65
66static struct irqchip arc_a_chip = {
67 .ack = arc_ack_irq_a,
68 .mask = arc_mask_irq_a,
69 .unmask = arc_unmask_irq_a,
70};
71
72static void arc_mask_irq_b(unsigned int irq)
73{
74 unsigned int val, mask;
75 mask = 1 << (irq & 7);
76 val = ioc_readb(IOC_IRQMASKB);
77 ioc_writeb(val & ~mask, IOC_IRQMASKB);
78}
79
80static void arc_unmask_irq_b(unsigned int irq)
81{
82 unsigned int val, mask;
83
84 mask = 1 << (irq & 7);
85 val = ioc_readb(IOC_IRQMASKB);
86 ioc_writeb(val | mask, IOC_IRQMASKB);
87}
88
89static struct irqchip arc_b_chip = {
90 .ack = arc_mask_irq_b,
91 .mask = arc_mask_irq_b,
92 .unmask = arc_unmask_irq_b,
93};
94
95/* FIXME - JMA none of these functions are used in arm26 currently
96static void arc_mask_irq_fiq(unsigned int irq)
97{
98 unsigned int val, mask;
99
100 mask = 1 << (irq & 7);
101 val = ioc_readb(IOC_FIQMASK);
102 ioc_writeb(val & ~mask, IOC_FIQMASK);
103}
104
105static void arc_unmask_irq_fiq(unsigned int irq)
106{
107 unsigned int val, mask;
108
109 mask = 1 << (irq & 7);
110 val = ioc_readb(IOC_FIQMASK);
111 ioc_writeb(val | mask, IOC_FIQMASK);
112}
113
114static struct irqchip arc_fiq_chip = {
115 .ack = arc_mask_irq_fiq,
116 .mask = arc_mask_irq_fiq,
117 .unmask = arc_unmask_irq_fiq,
118};
119*/
120
121void __init arc_init_irq(void)
122{
123 unsigned int irq, flags;
124
125 /* Disable all IOC interrupt sources */
126 ioc_writeb(0, IOC_IRQMASKA);
127 ioc_writeb(0, IOC_IRQMASKB);
128 ioc_writeb(0, IOC_FIQMASK);
129
130 for (irq = 0; irq < NR_IRQS; irq++) {
131 flags = IRQF_VALID;
132
133 if (irq <= 6 || (irq >= 9 && irq <= 15))
134 flags |= IRQF_PROBE;
135
136 if (irq == IRQ_KEYBOARDTX)
137 flags |= IRQF_NOAUTOEN;
138
139 switch (irq) {
140 case 0 ... 7:
141 set_irq_chip(irq, &arc_a_chip);
142 set_irq_handler(irq, do_level_IRQ);
143 set_irq_flags(irq, flags);
144 break;
145
146 case 8 ... 15:
147 set_irq_chip(irq, &arc_b_chip);
148 set_irq_handler(irq, do_level_IRQ);
149 set_irq_flags(irq, flags);
150
151/* case 64 ... 72:
152 set_irq_chip(irq, &arc_fiq_chip);
153 set_irq_flags(irq, flags);
154 break;
155*/
156
157 }
158 }
159
160 irq_desc[IRQ_KEYBOARDTX].noautoenable = 1;
161
162 init_FIQ();
163}
164