2 * linux/arch/m68knommu/kernel/ints.c -- General interrupt handling code
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)
11 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
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
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>
27 #include <asm/system.h>
29 #include <asm/irqnode.h>
30 #include <asm/traps.h>
32 #include <asm/machdep.h>
35 * This table stores the address info for each vector handler.
37 struct irq_entry irq_list[SYS_IRQS];
39 #define NUM_IRQ_NODES 16
40 static irq_node_t nodes[NUM_IRQ_NODES];
42 /* The number of spurious interrupts */
43 volatile unsigned int num_spurious;
45 unsigned int local_bh_count[NR_CPUS];
46 unsigned int local_irq_count[NR_CPUS];
48 static irqreturn_t default_irq_handler(int irq, void *ptr)
51 printk(KERN_INFO "%s(%d): default irq handler vec=%d [0x%x]\n",
52 __FILE__, __LINE__, irq, irq);
64 * This function should be called during kernel startup to initialize
65 * the IRQ handling routines.
68 void __init init_IRQ(void)
72 for (i = 0; i < SYS_IRQS; i++) {
73 if (mach_default_handler)
74 irq_list[i].handler = mach_default_handler;
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;
82 for (i = 0; i < NUM_IRQ_NODES; i++)
83 nodes[i].handler = NULL;
89 irq_node_t *new_irq_node(void)
94 for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
98 printk(KERN_INFO "new_irq_node: out of nodes\n");
104 irq_handler_t handler,
109 if (irq < 0 || irq >= NR_IRQS) {
110 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n", __FUNCTION__,
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);
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);
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);
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;
141 EXPORT_SYMBOL(request_irq);
143 void free_irq(unsigned int irq, void *dev_id)
145 if (irq >= NR_IRQS) {
146 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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);
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);
160 if (mach_default_handler)
161 irq_list[irq].handler = mach_default_handler;
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;
169 EXPORT_SYMBOL(free_irq);
172 int sys_request_irq(unsigned int irq, irq_handler_t handler,
173 unsigned long flags, const char *devname, void *dev_id)
176 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n",
177 __FUNCTION__, irq, devname);
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);
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);
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;
203 void sys_free_irq(unsigned int irq, void *dev_id)
206 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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);
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;
221 * Do we need these probe functions on the m68k?
223 * ... may be useful with ISA devices
225 unsigned long probe_irq_on (void)
230 EXPORT_SYMBOL(probe_irq_on);
232 int probe_irq_off (unsigned long irqs)
237 EXPORT_SYMBOL(probe_irq_off);
239 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
241 if (vec >= VEC_INT1 && vec <= VEC_INT7) {
243 kstat_cpu(0).irqs[vec]++;
244 irq_list[vec].handler(vec, irq_list[vec].dev_id);
246 if (mach_process_int)
247 mach_process_int(vec, fp);
249 panic("Can't process interrupt vector %ld\n", vec);
255 int show_interrupts(struct seq_file *p, void *v)
257 int i = *(loff_t *) v;
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)
267 seq_printf(p, "%s\n", irq_list[i].devname);
271 if (i == NR_IRQS && mach_get_irq_list)
272 mach_get_irq_list(p, v);
276 void init_irq_proc(void)
278 /* Insert /proc/irq driver here */