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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 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel_stat.h> | |
17 | #include <linux/errno.h> | |
18 | ||
19 | #include <asm/system.h> | |
20 | #include <asm/irq.h> | |
21 | #include <asm/traps.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/machdep.h> | |
24 | #include <asm/setup.h> | |
25 | ||
26 | #if defined(CONFIG_M68328) | |
27 | #include <asm/MC68328.h> | |
28 | #elif defined(CONFIG_M68EZ328) | |
29 | #include <asm/MC68EZ328.h> | |
30 | #elif defined(CONFIG_M68VZ328) | |
31 | #include <asm/MC68VZ328.h> | |
32 | #endif | |
33 | ||
34 | /* assembler routines */ | |
35 | asmlinkage void system_call(void); | |
36 | asmlinkage void buserr(void); | |
37 | asmlinkage void trap(void); | |
38 | asmlinkage void trap3(void); | |
39 | asmlinkage void trap4(void); | |
40 | asmlinkage void trap5(void); | |
41 | asmlinkage void trap6(void); | |
42 | asmlinkage void trap7(void); | |
43 | asmlinkage void trap8(void); | |
44 | asmlinkage void trap9(void); | |
45 | asmlinkage void trap10(void); | |
46 | asmlinkage void trap11(void); | |
47 | asmlinkage void trap12(void); | |
48 | asmlinkage void trap13(void); | |
49 | asmlinkage void trap14(void); | |
50 | asmlinkage void trap15(void); | |
51 | asmlinkage void trap33(void); | |
52 | asmlinkage void trap34(void); | |
53 | asmlinkage void trap35(void); | |
54 | asmlinkage void trap36(void); | |
55 | asmlinkage void trap37(void); | |
56 | asmlinkage void trap38(void); | |
57 | asmlinkage void trap39(void); | |
58 | asmlinkage void trap40(void); | |
59 | asmlinkage void trap41(void); | |
60 | asmlinkage void trap42(void); | |
61 | asmlinkage void trap43(void); | |
62 | asmlinkage void trap44(void); | |
63 | asmlinkage void trap45(void); | |
64 | asmlinkage void trap46(void); | |
65 | asmlinkage void trap47(void); | |
66 | asmlinkage irqreturn_t bad_interrupt(int, void *, struct pt_regs *); | |
67 | asmlinkage irqreturn_t inthandler(void); | |
68 | asmlinkage irqreturn_t inthandler1(void); | |
69 | asmlinkage irqreturn_t inthandler2(void); | |
70 | asmlinkage irqreturn_t inthandler3(void); | |
71 | asmlinkage irqreturn_t inthandler4(void); | |
72 | asmlinkage irqreturn_t inthandler5(void); | |
73 | asmlinkage irqreturn_t inthandler6(void); | |
74 | asmlinkage irqreturn_t inthandler7(void); | |
75 | ||
76 | extern e_vector *_ramvec; | |
77 | ||
78 | /* The number of spurious interrupts */ | |
79 | volatile unsigned int num_spurious; | |
80 | unsigned int local_irq_count[NR_CPUS]; | |
81 | ||
82 | /* irq node variables for the 32 (potential) on chip sources */ | |
83 | static irq_node_t int_irq_list[NR_IRQS]; | |
84 | ||
85 | #if !defined(CONFIG_DRAGEN2) | |
86 | asm (".global _start, __ramend/n/t" | |
87 | ".section .romvec/n" | |
88 | "e_vectors:\n\t" | |
89 | ".long __ramend-4, _start, buserr, trap, trap, trap, trap, trap\n\t" | |
90 | ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t" | |
91 | ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t" | |
92 | ".long trap, trap, trap, trap\n\t" | |
93 | ".long trap, trap, trap, trap\n\t" | |
94 | /*.long inthandler, inthandler, inthandler, inthandler | |
95 | .long inthandler4, inthandler, inthandler, inthandler */ | |
96 | /* TRAP #0-15 */ | |
97 | ".long system_call, trap, trap, trap, trap, trap, trap, trap\n\t" | |
98 | ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t" | |
99 | ".long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n\t" | |
100 | ".text\n" | |
101 | "ignore: rte"); | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * This function should be called during kernel startup to initialize | |
106 | * the IRQ handling routines. | |
107 | */ | |
108 | void init_IRQ(void) | |
109 | { | |
110 | int i; | |
111 | ||
112 | /* set up the vectors */ | |
113 | for (i = 72; i < 256; ++i) | |
114 | _ramvec[i] = (e_vector) bad_interrupt; | |
115 | ||
116 | _ramvec[32] = system_call; | |
117 | ||
118 | _ramvec[65] = (e_vector) inthandler1; | |
119 | _ramvec[66] = (e_vector) inthandler2; | |
120 | _ramvec[67] = (e_vector) inthandler3; | |
121 | _ramvec[68] = (e_vector) inthandler4; | |
122 | _ramvec[69] = (e_vector) inthandler5; | |
123 | _ramvec[70] = (e_vector) inthandler6; | |
124 | _ramvec[71] = (e_vector) inthandler7; | |
125 | ||
126 | IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */ | |
127 | ||
128 | /* initialize handlers */ | |
129 | for (i = 0; i < NR_IRQS; i++) { | |
130 | int_irq_list[i].handler = bad_interrupt; | |
131 | int_irq_list[i].flags = IRQ_FLG_STD; | |
132 | int_irq_list[i].dev_id = NULL; | |
133 | int_irq_list[i].devname = NULL; | |
134 | } | |
135 | ||
136 | /* turn off all interrupts */ | |
137 | IMR = ~0; | |
138 | } | |
139 | ||
140 | int request_irq( | |
141 | unsigned int irq, | |
142 | irqreturn_t (*handler)(int, void *, struct pt_regs *), | |
143 | unsigned long flags, | |
144 | const char *devname, | |
145 | void *dev_id) | |
146 | { | |
147 | if (irq >= NR_IRQS) { | |
148 | printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname); | |
149 | return -ENXIO; | |
150 | } | |
151 | ||
152 | if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) { | |
153 | if (int_irq_list[irq].flags & IRQ_FLG_LOCK) { | |
154 | printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n", | |
155 | __FUNCTION__, irq, int_irq_list[irq].devname); | |
156 | return -EBUSY; | |
157 | } | |
158 | if (flags & IRQ_FLG_REPLACE) { | |
159 | printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n", | |
160 | __FUNCTION__, devname, irq, int_irq_list[irq].devname); | |
161 | return -EBUSY; | |
162 | } | |
163 | } | |
164 | ||
165 | int_irq_list[irq].handler = handler; | |
166 | int_irq_list[irq].flags = flags; | |
167 | int_irq_list[irq].dev_id = dev_id; | |
168 | int_irq_list[irq].devname = devname; | |
169 | ||
170 | IMR &= ~(1<<irq); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | EXPORT_SYMBOL(request_irq); | |
176 | ||
177 | void free_irq(unsigned int irq, void *dev_id) | |
178 | { | |
179 | if (irq >= NR_IRQS) { | |
180 | printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq); | |
181 | return; | |
182 | } | |
183 | ||
184 | if (int_irq_list[irq].dev_id != dev_id) | |
185 | printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n", | |
186 | __FUNCTION__, irq, int_irq_list[irq].devname); | |
187 | ||
188 | int_irq_list[irq].handler = bad_interrupt; | |
189 | int_irq_list[irq].flags = IRQ_FLG_STD; | |
190 | int_irq_list[irq].dev_id = NULL; | |
191 | int_irq_list[irq].devname = NULL; | |
192 | ||
193 | IMR |= 1<<irq; | |
194 | } | |
195 | ||
196 | EXPORT_SYMBOL(free_irq); | |
197 | ||
198 | int show_interrupts(struct seq_file *p, void *v) | |
199 | { | |
200 | int i = *(loff_t *) v; | |
201 | ||
202 | if (i < NR_IRQS) { | |
203 | if (int_irq_list[i].devname) { | |
204 | seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]); | |
205 | if (int_irq_list[i].flags & IRQ_FLG_LOCK) | |
206 | seq_printf(p, "L "); | |
207 | else | |
208 | seq_printf(p, " "); | |
209 | seq_printf(p, "%s\n", int_irq_list[i].devname); | |
210 | } | |
211 | } | |
212 | if (i == NR_IRQS) | |
213 | seq_printf(p, " : %10u spurious\n", num_spurious); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | /* The 68k family did not have a good way to determine the source | |
219 | * of interrupts until later in the family. The EC000 core does | |
220 | * not provide the vector number on the stack, we vector everything | |
221 | * into one vector and look in the blasted mask register... | |
222 | * This code is designed to be fast, almost constant time, not clean! | |
223 | */ | |
224 | void process_int(int vec, struct pt_regs *fp) | |
225 | { | |
226 | int irq; | |
227 | int mask; | |
228 | ||
229 | unsigned long pend = ISR; | |
230 | ||
231 | while (pend) { | |
232 | if (pend & 0x0000ffff) { | |
233 | if (pend & 0x000000ff) { | |
234 | if (pend & 0x0000000f) { | |
235 | mask = 0x00000001; | |
236 | irq = 0; | |
237 | } else { | |
238 | mask = 0x00000010; | |
239 | irq = 4; | |
240 | } | |
241 | } else { | |
242 | if (pend & 0x00000f00) { | |
243 | mask = 0x00000100; | |
244 | irq = 8; | |
245 | } else { | |
246 | mask = 0x00001000; | |
247 | irq = 12; | |
248 | } | |
249 | } | |
250 | } else { | |
251 | if (pend & 0x00ff0000) { | |
252 | if (pend & 0x000f0000) { | |
253 | mask = 0x00010000; | |
254 | irq = 16; | |
255 | } else { | |
256 | mask = 0x00100000; | |
257 | irq = 20; | |
258 | } | |
259 | } else { | |
260 | if (pend & 0x0f000000) { | |
261 | mask = 0x01000000; | |
262 | irq = 24; | |
263 | } else { | |
264 | mask = 0x10000000; | |
265 | irq = 28; | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | while (! (mask & pend)) { | |
271 | mask <<=1; | |
272 | irq++; | |
273 | } | |
274 | ||
275 | kstat_cpu(0).irqs[irq]++; | |
276 | ||
277 | if (int_irq_list[irq].handler) { | |
278 | int_irq_list[irq].handler(irq, int_irq_list[irq].dev_id, fp); | |
279 | } else { | |
280 | printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the IMR...\n", irq); | |
281 | IMR |= mask; | |
282 | } | |
283 | pend &= ~mask; | |
284 | } | |
285 | } |