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Daniel Mentz94787a12013-05-29 21:12:04 -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
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <asm/traps.h>
18#include <asm/io.h>
19#include <asm/machdep.h>
20
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);
61asmlinkage irqreturn_t bad_interrupt(int, void *);
62asmlinkage 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 68k family did not have a good way to determine the source
74 * of interrupts until later in the family. The EC000 core does
75 * not provide the vector number on the stack, we vector everything
76 * into one vector and look in the blasted mask register...
77 * This code is designed to be fast, almost constant time, not clean!
78 */
79void process_int(int vec, struct pt_regs *fp)
80{
81 int irq;
82 int mask;
83
84 unsigned long pend = ISR;
85
86 while (pend) {
87 if (pend & 0x0000ffff) {
88 if (pend & 0x000000ff) {
89 if (pend & 0x0000000f) {
90 mask = 0x00000001;
91 irq = 0;
92 } else {
93 mask = 0x00000010;
94 irq = 4;
95 }
96 } else {
97 if (pend & 0x00000f00) {
98 mask = 0x00000100;
99 irq = 8;
100 } else {
101 mask = 0x00001000;
102 irq = 12;
103 }
104 }
105 } else {
106 if (pend & 0x00ff0000) {
107 if (pend & 0x000f0000) {
108 mask = 0x00010000;
109 irq = 16;
110 } else {
111 mask = 0x00100000;
112 irq = 20;
113 }
114 } else {
115 if (pend & 0x0f000000) {
116 mask = 0x01000000;
117 irq = 24;
118 } else {
119 mask = 0x10000000;
120 irq = 28;
121 }
122 }
123 }
124
125 while (! (mask & pend)) {
126 mask <<=1;
127 irq++;
128 }
129
130 do_IRQ(irq, fp);
131 pend &= ~mask;
132 }
133}
134
135static void intc_irq_unmask(struct irq_data *d)
136{
137 IMR &= ~(1 << d->irq);
138}
139
140static void intc_irq_mask(struct irq_data *d)
141{
142 IMR |= (1 << d->irq);
143}
144
145static struct irq_chip intc_irq_chip = {
146 .name = "M68K-INTC",
147 .irq_mask = intc_irq_mask,
148 .irq_unmask = intc_irq_unmask,
149};
150
151/*
152 * This function should be called during kernel startup to initialize
153 * the machine vector table.
154 */
155void __init trap_init(void)
156{
157 int i;
158
159 /* set up the vectors */
160 for (i = 72; i < 256; ++i)
161 _ramvec[i] = (e_vector) bad_interrupt;
162
163 _ramvec[32] = system_call;
164
165 _ramvec[65] = (e_vector) inthandler1;
166 _ramvec[66] = (e_vector) inthandler2;
167 _ramvec[67] = (e_vector) inthandler3;
168 _ramvec[68] = (e_vector) inthandler4;
169 _ramvec[69] = (e_vector) inthandler5;
170 _ramvec[70] = (e_vector) inthandler6;
171 _ramvec[71] = (e_vector) inthandler7;
172}
173
174void __init init_IRQ(void)
175{
176 int i;
177
178 IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
179
180 /* turn off all interrupts */
181 IMR = ~0;
182
183 for (i = 0; (i < NR_IRQS); i++) {
184 irq_set_chip(i, &intc_irq_chip);
185 irq_set_handler(i, handle_level_irq);
186 }
187}
188