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1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> | |
2502b667 | 14 | #include <linux/init.h> |
8668fb5d | 15 | #include <linux/interrupt.h> |
2502b667 | 16 | #include <linux/irq.h> |
1da177e4 LT |
17 | #include <asm/traps.h> |
18 | #include <asm/io.h> | |
19 | #include <asm/machdep.h> | |
1da177e4 LT |
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); | |
8668fb5d | 61 | asmlinkage irqreturn_t bad_interrupt(int, void *); |
1da177e4 LT |
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; | |
1da177e4 | 75 | |
1da177e4 LT |
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 | ||
2502b667 | 133 | do_IRQ(irq, fp); |
1da177e4 LT |
134 | pend &= ~mask; |
135 | } | |
136 | } | |
2502b667 | 137 | |
39a17940 | 138 | static void intc_irq_unmask(struct irq_data *d) |
2502b667 | 139 | { |
39a17940 | 140 | IMR &= ~(1 << d->irq); |
2502b667 GU |
141 | } |
142 | ||
39a17940 | 143 | static void intc_irq_mask(struct irq_data *d) |
2502b667 | 144 | { |
39a17940 | 145 | IMR |= (1 << d->irq); |
2502b667 GU |
146 | } |
147 | ||
1985d253 GU |
148 | static struct irq_chip intc_irq_chip = { |
149 | .name = "M68K-INTC", | |
39a17940 TG |
150 | .irq_mask = intc_irq_mask, |
151 | .irq_unmask = intc_irq_unmask, | |
1985d253 GU |
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) | |
2502b667 | 159 | { |
1985d253 GU |
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++) { | |
4c65595e GU |
182 | set_irq_chip(i, &intc_irq_chip); |
183 | set_irq_handler(i, handle_level_irq); | |
1985d253 | 184 | } |
2502b667 GU |
185 | } |
186 |