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