[PATCH] Declare init_irq_proc before we use it.
[linux-2.6.git] / arch / m68knommu / platform / 5307 / ints.c
1 /*
2  * linux/arch/m68knommu/kernel/ints.c -- General interrupt handling code
3  *
4  * Copyright (C) 1999-2002  Greg Ungerer (gerg@snapgear.com)
5  * Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
6  *                     Kenneth Albanowski <kjahds@kjahds.com>,
7  * Copyright (C) 2000  Lineo Inc. (www.lineo.com) 
8  *
9  * Based on:
10  *
11  * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
12  *
13  * This file is subject to the terms and conditions of the GNU General Public
14  * License.  See the file COPYING in the main directory of this archive
15  * for more details.
16  */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/init.h>
21 #include <linux/sched.h>
22 #include <linux/interrupt.h>
23 #include <linux/kernel_stat.h>
24 #include <linux/errno.h>
25 #include <linux/seq_file.h>
26
27 #include <asm/system.h>
28 #include <asm/irq.h>
29 #include <asm/irqnode.h>
30 #include <asm/traps.h>
31 #include <asm/page.h>
32 #include <asm/machdep.h>
33
34 /*
35  *      This table stores the address info for each vector handler.
36  */
37 struct irq_entry irq_list[SYS_IRQS];
38
39 #define NUM_IRQ_NODES 16
40 static irq_node_t nodes[NUM_IRQ_NODES];
41
42 /* The number of spurious interrupts */
43 volatile unsigned int num_spurious;
44
45 unsigned int local_bh_count[NR_CPUS];
46 unsigned int local_irq_count[NR_CPUS];
47
48 static irqreturn_t default_irq_handler(int irq, void *ptr)
49 {
50 #if 1
51         printk(KERN_INFO "%s(%d): default irq handler vec=%d [0x%x]\n",
52                 __FILE__, __LINE__, irq, irq);
53 #endif
54         return(IRQ_HANDLED);
55 }
56
57 /*
58  * void init_IRQ(void)
59  *
60  * Parameters:  None
61  *
62  * Returns:     Nothing
63  *
64  * This function should be called during kernel startup to initialize
65  * the IRQ handling routines.
66  */
67
68 void __init init_IRQ(void)
69 {
70         int i;
71
72         for (i = 0; i < SYS_IRQS; i++) {
73                 if (mach_default_handler)
74                         irq_list[i].handler = mach_default_handler;
75                 else
76                         irq_list[i].handler = default_irq_handler;
77                 irq_list[i].flags   = IRQ_FLG_STD;
78                 irq_list[i].dev_id  = NULL;
79                 irq_list[i].devname = NULL;
80         }
81
82         for (i = 0; i < NUM_IRQ_NODES; i++)
83                 nodes[i].handler = NULL;
84
85         if (mach_init_IRQ)
86                 mach_init_IRQ();
87 }
88
89 irq_node_t *new_irq_node(void)
90 {
91         irq_node_t *node;
92         short i;
93
94         for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
95                 if (!node->handler)
96                         return node;
97
98         printk(KERN_INFO "new_irq_node: out of nodes\n");
99         return NULL;
100 }
101
102 int request_irq(
103         unsigned int irq,
104         irq_handler_t handler,
105         unsigned long flags,
106         const char *devname,
107         void *dev_id)
108 {
109         if (irq < 0 || irq >= NR_IRQS) {
110                 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n", __FUNCTION__,
111                         irq, devname);
112                 return -ENXIO;
113         }
114
115         if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
116                 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
117                         printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
118                                __FUNCTION__, irq, irq_list[irq].devname);
119                         return -EBUSY;
120                 }
121                 if (flags & IRQ_FLG_REPLACE) {
122                         printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
123                                __FUNCTION__, devname, irq, irq_list[irq].devname);
124                         return -EBUSY;
125                 }
126         }
127
128         if (flags & IRQ_FLG_FAST) {
129                 extern asmlinkage void fasthandler(void);
130                 extern void set_evector(int vecnum, void (*handler)(void));
131                 set_evector(irq, fasthandler);
132         }
133
134         irq_list[irq].handler = handler;
135         irq_list[irq].flags   = flags;
136         irq_list[irq].dev_id  = dev_id;
137         irq_list[irq].devname = devname;
138         return 0;
139 }
140
141 EXPORT_SYMBOL(request_irq);
142
143 void free_irq(unsigned int irq, void *dev_id)
144 {
145         if (irq >= NR_IRQS) {
146                 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
147                 return;
148         }
149
150         if (irq_list[irq].dev_id != dev_id)
151                 printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
152                        __FUNCTION__, irq, irq_list[irq].devname);
153
154         if (irq_list[irq].flags & IRQ_FLG_FAST) {
155                 extern asmlinkage void inthandler(void);
156                 extern void set_evector(int vecnum, void (*handler)(void));
157                 set_evector(irq, inthandler);
158         }
159
160         if (mach_default_handler)
161                 irq_list[irq].handler = mach_default_handler;
162         else
163                 irq_list[irq].handler = default_irq_handler;
164         irq_list[irq].flags   = IRQ_FLG_STD;
165         irq_list[irq].dev_id  = NULL;
166         irq_list[irq].devname = NULL;
167 }
168
169 EXPORT_SYMBOL(free_irq);
170
171
172 int sys_request_irq(unsigned int irq, irq_handler_t handler, 
173                     unsigned long flags, const char *devname, void *dev_id)
174 {
175         if (irq > IRQ7) {
176                 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n",
177                        __FUNCTION__, irq, devname);
178                 return -ENXIO;
179         }
180
181 #if 0
182         if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
183                 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
184                         printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
185                                __FUNCTION__, irq, irq_list[irq].devname);
186                         return -EBUSY;
187                 }
188                 if (!(flags & IRQ_FLG_REPLACE)) {
189                         printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
190                                __FUNCTION__, devname, irq, irq_list[irq].devname);
191                         return -EBUSY;
192                 }
193         }
194 #endif
195
196         irq_list[irq].handler = handler;
197         irq_list[irq].flags   = flags;
198         irq_list[irq].dev_id  = dev_id;
199         irq_list[irq].devname = devname;
200         return 0;
201 }
202
203 void sys_free_irq(unsigned int irq, void *dev_id)
204 {
205         if (irq > IRQ7) {
206                 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
207                 return;
208         }
209
210         if (irq_list[irq].dev_id != dev_id)
211                 printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
212                        __FUNCTION__, irq, irq_list[irq].devname);
213
214         irq_list[irq].handler = mach_default_handler;
215         irq_list[irq].flags   = 0;
216         irq_list[irq].dev_id  = NULL;
217         irq_list[irq].devname = NULL;
218 }
219
220 /*
221  * Do we need these probe functions on the m68k?
222  *
223  *  ... may be useful with ISA devices
224  */
225 unsigned long probe_irq_on (void)
226 {
227         return 0;
228 }
229
230 EXPORT_SYMBOL(probe_irq_on);
231
232 int probe_irq_off (unsigned long irqs)
233 {
234         return 0;
235 }
236
237 EXPORT_SYMBOL(probe_irq_off);
238
239 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
240 {
241         if (vec >= VEC_INT1 && vec <= VEC_INT7) {
242                 vec -= VEC_SPUR;
243                 kstat_cpu(0).irqs[vec]++;
244                 irq_list[vec].handler(vec, irq_list[vec].dev_id);
245         } else {
246                 if (mach_process_int)
247                         mach_process_int(vec, fp);
248                 else
249                         panic("Can't process interrupt vector %ld\n", vec);
250                 return;
251         }
252 }
253
254
255 int show_interrupts(struct seq_file *p, void *v)
256 {
257         int i = *(loff_t *) v;
258
259         if (i < NR_IRQS) {
260                 if (! (irq_list[i].flags & IRQ_FLG_STD)) {
261                         seq_printf(p, "%3d: %10u ", i,
262                                 (i ? kstat_cpu(0).irqs[i] : num_spurious));
263                         if (irq_list[i].flags & IRQ_FLG_LOCK)
264                                 seq_printf(p, "L ");
265                         else
266                                 seq_printf(p, "  ");
267                         seq_printf(p, "%s\n", irq_list[i].devname);
268                 }
269         }
270
271         if (i == NR_IRQS && mach_get_irq_list)
272                 mach_get_irq_list(p, v);
273         return 0;
274 }
275
276 void init_irq_proc(void)
277 {
278         /* Insert /proc/irq driver here */
279 }
280