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_irq_count[NR_CPUS];
47 static irqreturn_t default_irq_handler(int irq, void *ptr)
50 printk(KERN_INFO "%s(%d): default irq handler vec=%d [0x%x]\n",
51 __FILE__, __LINE__, irq, irq);
63 * This function should be called during kernel startup to initialize
64 * the IRQ handling routines.
67 void __init init_IRQ(void)
71 for (i = 0; i < SYS_IRQS; i++) {
72 if (mach_default_handler)
73 irq_list[i].handler = mach_default_handler;
75 irq_list[i].handler = default_irq_handler;
76 irq_list[i].flags = IRQ_FLG_STD;
77 irq_list[i].dev_id = NULL;
78 irq_list[i].devname = NULL;
81 for (i = 0; i < NUM_IRQ_NODES; i++)
82 nodes[i].handler = NULL;
88 irq_node_t *new_irq_node(void)
93 for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
97 printk(KERN_INFO "new_irq_node: out of nodes\n");
103 irq_handler_t handler,
108 if (irq < 0 || irq >= NR_IRQS) {
109 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n", __FUNCTION__,
114 if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
115 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
116 printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
117 __FUNCTION__, irq, irq_list[irq].devname);
120 if (flags & IRQ_FLG_REPLACE) {
121 printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
122 __FUNCTION__, devname, irq, irq_list[irq].devname);
127 if (flags & IRQ_FLG_FAST) {
128 extern asmlinkage void fasthandler(void);
129 extern void set_evector(int vecnum, void (*handler)(void));
130 set_evector(irq, fasthandler);
133 irq_list[irq].handler = handler;
134 irq_list[irq].flags = flags;
135 irq_list[irq].dev_id = dev_id;
136 irq_list[irq].devname = devname;
140 EXPORT_SYMBOL(request_irq);
142 void free_irq(unsigned int irq, void *dev_id)
144 if (irq >= NR_IRQS) {
145 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
149 if (irq_list[irq].dev_id != dev_id)
150 printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
151 __FUNCTION__, irq, irq_list[irq].devname);
153 if (irq_list[irq].flags & IRQ_FLG_FAST) {
154 extern asmlinkage void inthandler(void);
155 extern void set_evector(int vecnum, void (*handler)(void));
156 set_evector(irq, inthandler);
159 if (mach_default_handler)
160 irq_list[irq].handler = mach_default_handler;
162 irq_list[irq].handler = default_irq_handler;
163 irq_list[irq].flags = IRQ_FLG_STD;
164 irq_list[irq].dev_id = NULL;
165 irq_list[irq].devname = NULL;
168 EXPORT_SYMBOL(free_irq);
171 int sys_request_irq(unsigned int irq, irq_handler_t handler,
172 unsigned long flags, const char *devname, void *dev_id)
175 printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n",
176 __FUNCTION__, irq, devname);
181 if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
182 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
183 printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
184 __FUNCTION__, irq, irq_list[irq].devname);
187 if (!(flags & IRQ_FLG_REPLACE)) {
188 printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
189 __FUNCTION__, devname, irq, irq_list[irq].devname);
195 irq_list[irq].handler = handler;
196 irq_list[irq].flags = flags;
197 irq_list[irq].dev_id = dev_id;
198 irq_list[irq].devname = devname;
202 void sys_free_irq(unsigned int irq, void *dev_id)
205 printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
209 if (irq_list[irq].dev_id != dev_id)
210 printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
211 __FUNCTION__, irq, irq_list[irq].devname);
213 irq_list[irq].handler = mach_default_handler;
214 irq_list[irq].flags = 0;
215 irq_list[irq].dev_id = NULL;
216 irq_list[irq].devname = NULL;
220 * Do we need these probe functions on the m68k?
222 * ... may be useful with ISA devices
224 unsigned long probe_irq_on (void)
229 EXPORT_SYMBOL(probe_irq_on);
231 int probe_irq_off (unsigned long irqs)
236 EXPORT_SYMBOL(probe_irq_off);
238 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
240 if (vec >= VEC_INT1 && vec <= VEC_INT7) {
242 kstat_cpu(0).irqs[vec]++;
243 irq_list[vec].handler(vec, irq_list[vec].dev_id);
245 if (mach_process_int)
246 mach_process_int(vec, fp);
248 panic("Can't process interrupt vector %ld\n", vec);
254 int show_interrupts(struct seq_file *p, void *v)
256 int i = *(loff_t *) v;
259 if (! (irq_list[i].flags & IRQ_FLG_STD)) {
260 seq_printf(p, "%3d: %10u ", i,
261 (i ? kstat_cpu(0).irqs[i] : num_spurious));
262 if (irq_list[i].flags & IRQ_FLG_LOCK)
266 seq_printf(p, "%s\n", irq_list[i].devname);
270 if (i == NR_IRQS && mach_get_irq_list)
271 mach_get_irq_list(p, v);
275 void init_irq_proc(void)
277 /* Insert /proc/irq driver here */