m68knommu: complete interrupt controller code for the 68328 CPU's
[linux-2.6.git] / arch / m68knommu / platform / 68328 / ints.c
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 number of spurious interrupts */
74 volatile unsigned int num_spurious;
75
76 /* The 68k family did not have a good way to determine the source
77  * of interrupts until later in the family.  The EC000 core does
78  * not provide the vector number on the stack, we vector everything
79  * into one vector and look in the blasted mask register...
80  * This code is designed to be fast, almost constant time, not clean!
81  */
82 void process_int(int vec, struct pt_regs *fp)
83 {
84         int irq;
85         int mask;
86
87         unsigned long pend = ISR;
88
89         while (pend) {
90                 if (pend & 0x0000ffff) {
91                         if (pend & 0x000000ff) {
92                                 if (pend & 0x0000000f) {
93                                         mask = 0x00000001;
94                                         irq = 0;
95                                 } else {
96                                         mask = 0x00000010;
97                                         irq = 4;
98                                 }
99                         } else {
100                                 if (pend & 0x00000f00) {
101                                         mask = 0x00000100;
102                                         irq = 8;
103                                 } else {
104                                         mask = 0x00001000;
105                                         irq = 12;
106                                 }
107                         }
108                 } else {
109                         if (pend & 0x00ff0000) {
110                                 if (pend & 0x000f0000) {
111                                         mask = 0x00010000;
112                                         irq = 16;
113                                 } else {
114                                         mask = 0x00100000;
115                                         irq = 20;
116                                 }
117                         } else {
118                                 if (pend & 0x0f000000) {
119                                         mask = 0x01000000;
120                                         irq = 24;
121                                 } else {
122                                         mask = 0x10000000;
123                                         irq = 28;
124                                 }
125                         }
126                 }
127
128                 while (! (mask & pend)) {
129                         mask <<=1;
130                         irq++;
131                 }
132
133                 do_IRQ(irq, fp);
134                 pend &= ~mask;
135         }
136 }
137
138 static void intc_irq_unmask(unsigned int irq)
139 {
140         IMR &= ~(1<<irq);
141 }
142
143 static void intc_irq_mask(unsigned int irq)
144 {
145         IMR |= (1<<irq);
146 }
147
148 static struct irq_chip intc_irq_chip = {
149         .name           = "M68K-INTC",
150         .mask           = intc_irq_mask,
151         .unmask         = intc_irq_unmask,
152 };
153
154 /*
155  * This function should be called during kernel startup to initialize
156  * the machine vector table.
157  */
158 void __init init_IRQ(void)
159 {
160         int i;
161
162         /* set up the vectors */
163         for (i = 72; i < 256; ++i)
164                 _ramvec[i] = (e_vector) bad_interrupt;
165
166         _ramvec[32] = system_call;
167
168         _ramvec[65] = (e_vector) inthandler1;
169         _ramvec[66] = (e_vector) inthandler2;
170         _ramvec[67] = (e_vector) inthandler3;
171         _ramvec[68] = (e_vector) inthandler4;
172         _ramvec[69] = (e_vector) inthandler5;
173         _ramvec[70] = (e_vector) inthandler6;
174         _ramvec[71] = (e_vector) inthandler7;
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_desc[i].status = IRQ_DISABLED;
183                 irq_desc[i].action = NULL;
184                 irq_desc[i].depth = 1;
185                 irq_desc[i].chip = &intc_irq_chip;
186         }
187 }
188