2 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
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
8 * 07/03/96: Timer initialization, and thus mach_sched_init(),
9 * removed from request_irq() and moved to init_time().
10 * We should therefore consider renaming our add_isr() and
11 * remove_isr() to request_irq() and free_irq()
12 * respectively, so they are compliant with the other
14 * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
15 * Removed irq list support, if any machine needs an irq server
16 * it must implement this itself (as it's already done), instead
17 * only default handler are used with mach_default_handler.
18 * request_irq got some flags different from other architectures:
19 * - IRQ_FLG_REPLACE : Replace an existing handler (the default one
20 * can be replaced without this flag)
21 * - IRQ_FLG_LOCK : handler can't be replaced
22 * There are other machine depending flags, see there
23 * If you want to replace a default handler you should know what
24 * you're doing, since it might handle different other irq sources
25 * which must be served /Roman Zippel
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/sched.h>
31 #include <linux/interrupt.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
36 #include <asm/setup.h>
37 #include <asm/system.h>
39 #include <asm/traps.h>
41 #include <asm/machdep.h>
42 #include <asm/cacheflush.h>
43 #include <asm/irq_regs.h>
46 #include <asm/q40ints.h>
49 extern u32 auto_irqhandler_fixup[];
50 extern u32 user_irqhandler_fixup[];
51 extern u16 user_irqvec_fixup[];
53 /* table for system interrupt handlers */
54 static struct irq_node *irq_list[NR_IRQS];
55 static struct irq_chip *irq_chip[NR_IRQS];
56 static int irq_depth[NR_IRQS];
58 static int m68k_first_user_vec;
60 static struct irq_chip auto_irq_chip = {
62 .irq_startup = m68k_irq_startup,
63 .irq_shutdown = m68k_irq_shutdown,
66 static struct irq_chip user_irq_chip = {
68 .irq_startup = m68k_irq_startup,
69 .irq_shutdown = m68k_irq_shutdown,
72 #define NUM_IRQ_NODES 100
73 static irq_node_t nodes[NUM_IRQ_NODES];
82 * This function should be called during kernel startup to initialize
83 * the IRQ handling routines.
86 void __init init_IRQ(void)
90 /* assembly irq entry code relies on this... */
91 if (HARDIRQ_MASK != 0x00ff0000) {
92 extern void hardirq_mask_is_broken(void);
93 hardirq_mask_is_broken();
96 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
97 irq_chip[i] = &auto_irq_chip;
103 * m68k_setup_auto_interrupt
104 * @handler: called from auto vector interrupts
106 * setup the handler to be called from auto vector interrupts instead of the
107 * standard __m68k_handle_int(), it will be called with irq numbers in the range
108 * from IRQ_AUTO_1 - IRQ_AUTO_7.
110 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
113 *auto_irqhandler_fixup = (u32)handler;
118 * m68k_setup_user_interrupt
119 * @vec: first user vector interrupt to handle
120 * @cnt: number of active user vector interrupts
121 * @handler: called from user vector interrupts
123 * setup user vector interrupts, this includes activating the specified range
124 * of interrupts, only then these interrupts can be requested (note: this is
125 * different from auto vector interrupts). An optional handler can be installed
126 * to be called instead of the default __m68k_handle_int(), it will be called
127 * with irq numbers starting from IRQ_USER.
129 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
130 void (*handler)(unsigned int, struct pt_regs *))
134 BUG_ON(IRQ_USER + cnt > NR_IRQS);
135 m68k_first_user_vec = vec;
136 for (i = 0; i < cnt; i++)
137 irq_chip[IRQ_USER + i] = &user_irq_chip;
138 *user_irqvec_fixup = vec - IRQ_USER;
140 *user_irqhandler_fixup = (u32)handler;
145 * m68k_setup_irq_chip
146 * @contr: irq controller which controls specified irq
147 * @irq: first irq to be managed by the controller
149 * Change the controller for the specified range of irq, which will be used to
150 * manage these irq. auto/user irq already have a default controller, which can
151 * be changed as well, but the controller probably should use m68k_irq_startup/
154 void m68k_setup_irq_chip(struct irq_chip *contr, unsigned int irq,
159 for (i = 0; i < cnt; i++)
160 irq_chip[irq + i] = contr;
163 irq_node_t *new_irq_node(void)
168 for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {
169 if (!node->handler) {
170 memset(node, 0, sizeof(*node));
175 printk ("new_irq_node: out of nodes\n");
179 int setup_irq(unsigned int irq, struct irq_node *node)
181 struct irq_chip *contr;
182 struct irq_node **prev;
185 if (irq >= NR_IRQS || !(contr = irq_chip[irq])) {
186 printk("%s: Incorrect IRQ %d from %s\n",
187 __func__, irq, node->devname);
191 local_irq_save(flags);
193 prev = irq_list + irq;
195 /* Can't share interrupts unless both agree to */
196 if (!((*prev)->flags & node->flags & IRQF_SHARED)) {
197 local_irq_restore(flags);
201 prev = &(*prev)->next;
204 if (!irq_list[irq]) {
205 if (contr->irq_startup)
206 contr->irq_startup(irq);
208 contr->irq_enable(irq);
213 local_irq_restore(flags);
218 int request_irq(unsigned int irq,
219 irq_handler_t handler,
220 unsigned long flags, const char *devname, void *dev_id)
222 struct irq_node *node;
225 node = new_irq_node();
229 node->handler = handler;
231 node->dev_id = dev_id;
232 node->devname = devname;
234 res = setup_irq(irq, node);
236 node->handler = NULL;
241 EXPORT_SYMBOL(request_irq);
243 void free_irq(unsigned int irq, void *dev_id)
245 struct irq_chip *contr;
246 struct irq_node **p, *node;
249 if (irq >= NR_IRQS || !(contr = irq_chip[irq])) {
250 printk("%s: Incorrect IRQ %d\n", __func__, irq);
254 local_irq_save(flags);
257 while ((node = *p)) {
258 if (node->dev_id == dev_id)
265 node->handler = NULL;
267 printk("%s: Removing probably wrong IRQ %d\n",
270 if (!irq_list[irq]) {
271 if (contr->irq_shutdown)
272 contr->irq_shutdown(irq);
274 contr->irq_disable(irq);
277 local_irq_restore(flags);
280 EXPORT_SYMBOL(free_irq);
282 void enable_irq(unsigned int irq)
284 struct irq_chip *contr;
287 if (irq >= NR_IRQS || !(contr = irq_chip[irq])) {
288 printk("%s: Incorrect IRQ %d\n",
293 local_irq_save(flags);
294 if (irq_depth[irq]) {
295 if (!--irq_depth[irq]) {
296 if (contr->irq_enable)
297 contr->irq_enable(irq);
301 local_irq_restore(flags);
304 EXPORT_SYMBOL(enable_irq);
306 void disable_irq(unsigned int irq)
308 struct irq_chip *contr;
311 if (irq >= NR_IRQS || !(contr = irq_chip[irq])) {
312 printk("%s: Incorrect IRQ %d\n",
317 local_irq_save(flags);
318 if (!irq_depth[irq]++) {
319 if (contr->irq_disable)
320 contr->irq_disable(irq);
322 local_irq_restore(flags);
325 EXPORT_SYMBOL(disable_irq);
327 void disable_irq_nosync(unsigned int irq) __attribute__((alias("disable_irq")));
329 EXPORT_SYMBOL(disable_irq_nosync);
331 unsigned int m68k_irq_startup(unsigned int irq)
333 if (irq <= IRQ_AUTO_7)
334 vectors[VEC_SPUR + irq] = auto_inthandler;
336 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
340 void m68k_irq_shutdown(unsigned int irq)
342 if (irq <= IRQ_AUTO_7)
343 vectors[VEC_SPUR + irq] = bad_inthandler;
345 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
350 * Do we need these probe functions on the m68k?
352 * ... may be useful with ISA devices
354 unsigned long probe_irq_on (void)
358 return q40_probe_irq_on();
363 EXPORT_SYMBOL(probe_irq_on);
365 int probe_irq_off (unsigned long irqs)
369 return q40_probe_irq_off(irqs);
374 EXPORT_SYMBOL(probe_irq_off);
376 unsigned int irq_canonicalize(unsigned int irq)
379 if (MACH_IS_Q40 && irq == 11)
385 EXPORT_SYMBOL(irq_canonicalize);
387 asmlinkage void m68k_handle_int(unsigned int irq)
389 struct irq_node *node;
390 kstat_cpu(0).irqs[irq]++;
391 node = irq_list[irq];
393 node->handler(irq, node->dev_id);
398 asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs)
400 struct pt_regs *old_regs;
401 old_regs = set_irq_regs(regs);
402 m68k_handle_int(irq);
403 set_irq_regs(old_regs);
406 asmlinkage void handle_badint(struct pt_regs *regs)
408 kstat_cpu(0).irqs[0]++;
409 printk("unexpected interrupt from %u\n", regs->vector);
412 int show_interrupts(struct seq_file *p, void *v)
414 struct irq_chip *contr;
415 struct irq_node *node;
416 int i = *(loff_t *) v;
418 /* autovector interrupts */
422 seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
423 while ((node = node->next))
424 seq_printf(p, ", %s", node->devname);
430 #ifdef CONFIG_PROC_FS
431 void init_irq_proc(void)
433 /* Insert /proc/irq driver here */