1 /*
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 */
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 extern 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 */
process_int(int vec,struct pt_regs * fp)79 void 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
intc_irq_unmask(struct irq_data * d)135 static void intc_irq_unmask(struct irq_data *d)
136 {
137 IMR &= ~(1 << d->irq);
138 }
139
intc_irq_mask(struct irq_data * d)140 static void intc_irq_mask(struct irq_data *d)
141 {
142 IMR |= (1 << d->irq);
143 }
144
145 static 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 */
trap_init(void)155 void __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
init_IRQ(void)174 void __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
189