1 /*
2 * ints.c - Generic interrupt controller support
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 <linux/cpu.h>
18 #include <asm/traps.h>
19 #include <asm/io.h>
20 #include <asm/machdep.h>
21
22 #if defined(CONFIG_M68EZ328)
23 #include <asm/MC68EZ328.h>
24 #elif defined(CONFIG_M68VZ328)
25 #include <asm/MC68VZ328.h>
26 #else
27 #include <asm/MC68328.h>
28 #endif
29
30 #include "ints.h"
31
32 /* assembler routines */
33 asmlinkage void system_call(void);
34 asmlinkage void buserr(void);
35 asmlinkage void trap(void);
36 asmlinkage void trap3(void);
37 asmlinkage void trap4(void);
38 asmlinkage void trap5(void);
39 asmlinkage void trap6(void);
40 asmlinkage void trap7(void);
41 asmlinkage void trap8(void);
42 asmlinkage void trap9(void);
43 asmlinkage void trap10(void);
44 asmlinkage void trap11(void);
45 asmlinkage void trap12(void);
46 asmlinkage void trap13(void);
47 asmlinkage void trap14(void);
48 asmlinkage void trap15(void);
49 asmlinkage void trap33(void);
50 asmlinkage void trap34(void);
51 asmlinkage void trap35(void);
52 asmlinkage void trap36(void);
53 asmlinkage void trap37(void);
54 asmlinkage void trap38(void);
55 asmlinkage void trap39(void);
56 asmlinkage void trap40(void);
57 asmlinkage void trap41(void);
58 asmlinkage void trap42(void);
59 asmlinkage void trap43(void);
60 asmlinkage void trap44(void);
61 asmlinkage void trap45(void);
62 asmlinkage void trap46(void);
63 asmlinkage void trap47(void);
64 asmlinkage irqreturn_t bad_interrupt(int, void *);
65 asmlinkage irqreturn_t inthandler(void);
66 asmlinkage irqreturn_t inthandler1(void);
67 asmlinkage irqreturn_t inthandler2(void);
68 asmlinkage irqreturn_t inthandler3(void);
69 asmlinkage irqreturn_t inthandler4(void);
70 asmlinkage irqreturn_t inthandler5(void);
71 asmlinkage irqreturn_t inthandler6(void);
72 asmlinkage irqreturn_t inthandler7(void);
73
74 /* The 68k family did not have a good way to determine the source
75 * of interrupts until later in the family. The EC000 core does
76 * not provide the vector number on the stack, we vector everything
77 * into one vector and look in the blasted mask register...
78 * This code is designed to be fast, almost constant time, not clean!
79 */
process_int(int vec,struct pt_regs * fp)80 asmlinkage void process_int(int vec, struct pt_regs *fp)
81 {
82 int irq;
83 int mask;
84
85 unsigned long pend = ISR;
86
87 while (pend) {
88 if (pend & 0x0000ffff) {
89 if (pend & 0x000000ff) {
90 if (pend & 0x0000000f) {
91 mask = 0x00000001;
92 irq = 0;
93 } else {
94 mask = 0x00000010;
95 irq = 4;
96 }
97 } else {
98 if (pend & 0x00000f00) {
99 mask = 0x00000100;
100 irq = 8;
101 } else {
102 mask = 0x00001000;
103 irq = 12;
104 }
105 }
106 } else {
107 if (pend & 0x00ff0000) {
108 if (pend & 0x000f0000) {
109 mask = 0x00010000;
110 irq = 16;
111 } else {
112 mask = 0x00100000;
113 irq = 20;
114 }
115 } else {
116 if (pend & 0x0f000000) {
117 mask = 0x01000000;
118 irq = 24;
119 } else {
120 mask = 0x10000000;
121 irq = 28;
122 }
123 }
124 }
125
126 while (! (mask & pend)) {
127 mask <<=1;
128 irq++;
129 }
130
131 do_IRQ(irq, fp);
132 pend &= ~mask;
133 }
134 }
135
intc_irq_unmask(struct irq_data * d)136 static void intc_irq_unmask(struct irq_data *d)
137 {
138 IMR &= ~(1 << d->irq);
139 }
140
intc_irq_mask(struct irq_data * d)141 static void intc_irq_mask(struct irq_data *d)
142 {
143 IMR |= (1 << d->irq);
144 }
145
146 static struct irq_chip intc_irq_chip = {
147 .name = "M68K-INTC",
148 .irq_mask = intc_irq_mask,
149 .irq_unmask = intc_irq_unmask,
150 };
151
152 /*
153 * This function should be called during kernel startup to initialize
154 * the machine vector table.
155 */
trap_init(void)156 void __init trap_init(void)
157 {
158 int i;
159
160 /* set up the vectors */
161 for (i = 72; i < 256; ++i)
162 _ramvec[i] = (e_vector) bad_interrupt;
163
164 _ramvec[32] = system_call;
165
166 _ramvec[65] = (e_vector) inthandler1;
167 _ramvec[66] = (e_vector) inthandler2;
168 _ramvec[67] = (e_vector) inthandler3;
169 _ramvec[68] = (e_vector) inthandler4;
170 _ramvec[69] = (e_vector) inthandler5;
171 _ramvec[70] = (e_vector) inthandler6;
172 _ramvec[71] = (e_vector) inthandler7;
173 }
174
init_IRQ(void)175 void __init init_IRQ(void)
176 {
177 int i;
178
179 IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
180
181 /* turn off all interrupts */
182 IMR = ~0;
183
184 for (i = 0; (i < NR_IRQS); i++) {
185 irq_set_chip(i, &intc_irq_chip);
186 irq_set_handler(i, handle_level_irq);
187 }
188 }
189
190