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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/m68knommu/platform/68328/ints.c
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
6 * for more details.
7 *
8 * Copyright 1996 Roman Zippel
9 * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/kernel.h>
Greg Ungerer2502b662007-07-19 01:49:12 -070014#include <linux/init.h>
Greg Ungerer8668fb52007-03-07 11:28:13 +100015#include <linux/interrupt.h>
Greg Ungerer2502b662007-07-19 01:49:12 -070016#include <linux/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <asm/traps.h>
18#include <asm/io.h>
19#include <asm/machdep.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#if defined(CONFIG_M68328)
22#include <asm/MC68328.h>
23#elif defined(CONFIG_M68EZ328)
24#include <asm/MC68EZ328.h>
25#elif defined(CONFIG_M68VZ328)
26#include <asm/MC68VZ328.h>
27#endif
28
29/* assembler routines */
30asmlinkage void system_call(void);
31asmlinkage void buserr(void);
32asmlinkage void trap(void);
33asmlinkage void trap3(void);
34asmlinkage void trap4(void);
35asmlinkage void trap5(void);
36asmlinkage void trap6(void);
37asmlinkage void trap7(void);
38asmlinkage void trap8(void);
39asmlinkage void trap9(void);
40asmlinkage void trap10(void);
41asmlinkage void trap11(void);
42asmlinkage void trap12(void);
43asmlinkage void trap13(void);
44asmlinkage void trap14(void);
45asmlinkage void trap15(void);
46asmlinkage void trap33(void);
47asmlinkage void trap34(void);
48asmlinkage void trap35(void);
49asmlinkage void trap36(void);
50asmlinkage void trap37(void);
51asmlinkage void trap38(void);
52asmlinkage void trap39(void);
53asmlinkage void trap40(void);
54asmlinkage void trap41(void);
55asmlinkage void trap42(void);
56asmlinkage void trap43(void);
57asmlinkage void trap44(void);
58asmlinkage void trap45(void);
59asmlinkage void trap46(void);
60asmlinkage void trap47(void);
Greg Ungerer8668fb52007-03-07 11:28:13 +100061asmlinkage irqreturn_t bad_interrupt(int, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062asmlinkage irqreturn_t inthandler(void);
63asmlinkage irqreturn_t inthandler1(void);
64asmlinkage irqreturn_t inthandler2(void);
65asmlinkage irqreturn_t inthandler3(void);
66asmlinkage irqreturn_t inthandler4(void);
67asmlinkage irqreturn_t inthandler5(void);
68asmlinkage irqreturn_t inthandler6(void);
69asmlinkage irqreturn_t inthandler7(void);
70
71extern e_vector *_ramvec;
72
73/* The number of spurious interrupts */
74volatile unsigned int num_spurious;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076/*
77 * This function should be called during kernel startup to initialize
Greg Ungerer2502b662007-07-19 01:49:12 -070078 * the machine vector table.
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 */
Greg Ungerer2502b662007-07-19 01:49:12 -070080void __init init_vectors(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 int i;
83
84 /* set up the vectors */
85 for (i = 72; i < 256; ++i)
86 _ramvec[i] = (e_vector) bad_interrupt;
87
88 _ramvec[32] = system_call;
89
90 _ramvec[65] = (e_vector) inthandler1;
91 _ramvec[66] = (e_vector) inthandler2;
92 _ramvec[67] = (e_vector) inthandler3;
93 _ramvec[68] = (e_vector) inthandler4;
94 _ramvec[69] = (e_vector) inthandler5;
95 _ramvec[70] = (e_vector) inthandler6;
96 _ramvec[71] = (e_vector) inthandler7;
97
98 IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 /* turn off all interrupts */
101 IMR = ~0;
102}
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/* The 68k family did not have a good way to determine the source
105 * of interrupts until later in the family. The EC000 core does
106 * not provide the vector number on the stack, we vector everything
107 * into one vector and look in the blasted mask register...
108 * This code is designed to be fast, almost constant time, not clean!
109 */
110void process_int(int vec, struct pt_regs *fp)
111{
112 int irq;
113 int mask;
114
115 unsigned long pend = ISR;
116
117 while (pend) {
118 if (pend & 0x0000ffff) {
119 if (pend & 0x000000ff) {
120 if (pend & 0x0000000f) {
121 mask = 0x00000001;
122 irq = 0;
123 } else {
124 mask = 0x00000010;
125 irq = 4;
126 }
127 } else {
128 if (pend & 0x00000f00) {
129 mask = 0x00000100;
130 irq = 8;
131 } else {
132 mask = 0x00001000;
133 irq = 12;
134 }
135 }
136 } else {
137 if (pend & 0x00ff0000) {
138 if (pend & 0x000f0000) {
139 mask = 0x00010000;
140 irq = 16;
141 } else {
142 mask = 0x00100000;
143 irq = 20;
144 }
145 } else {
146 if (pend & 0x0f000000) {
147 mask = 0x01000000;
148 irq = 24;
149 } else {
150 mask = 0x10000000;
151 irq = 28;
152 }
153 }
154 }
155
156 while (! (mask & pend)) {
157 mask <<=1;
158 irq++;
159 }
160
Greg Ungerer2502b662007-07-19 01:49:12 -0700161 do_IRQ(irq, fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 pend &= ~mask;
163 }
164}
Greg Ungerer2502b662007-07-19 01:49:12 -0700165
166void enable_vector(unsigned int irq)
167{
168 IMR &= ~(1<<irq);
169}
170
171void disable_vector(unsigned int irq)
172{
173 IMR |= (1<<irq);
174}
175
176void ack_vector(unsigned int irq)
177{
178 /* Nothing needed */
179}
180