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/kernel_stat.h>
32 #include <linux/errno.h>
33 #include <linux/init.h>
35 #include <asm/setup.h>
36 #include <asm/system.h>
38 #include <asm/traps.h>
40 #include <asm/machdep.h>
41 #include <asm/cacheflush.h>
42 #include <asm/irq_regs.h>
45 #include <asm/q40ints.h>
48 extern u32 auto_irqhandler_fixup[];
49 extern u32 user_irqhandler_fixup[];
50 extern u16 user_irqvec_fixup[];
52 /* table for system interrupt handlers */
53 static struct irq_node *irq_list[NR_IRQS];
54 static struct irq_controller *irq_controller[NR_IRQS];
55 static int irq_depth[NR_IRQS];
57 static int m68k_first_user_vec;
59 static struct irq_controller auto_irq_controller = {
61 .lock = SPIN_LOCK_UNLOCKED,
62 .startup = m68k_irq_startup,
63 .shutdown = m68k_irq_shutdown,
66 static struct irq_controller user_irq_controller = {
68 .lock = SPIN_LOCK_UNLOCKED,
69 .startup = m68k_irq_startup,
70 .shutdown = m68k_irq_shutdown,
73 #define NUM_IRQ_NODES 100
74 static irq_node_t nodes[NUM_IRQ_NODES];
83 * This function should be called during kernel startup to initialize
84 * the IRQ handling routines.
87 void __init init_IRQ(void)
91 /* assembly irq entry code relies on this... */
92 if (HARDIRQ_MASK != 0x00ff0000) {
93 extern void hardirq_mask_is_broken(void);
94 hardirq_mask_is_broken();
97 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
98 irq_controller[i] = &auto_irq_controller;
104 * m68k_setup_auto_interrupt
105 * @handler: called from auto vector interrupts
107 * setup the handler to be called from auto vector interrupts instead of the
108 * standard __m68k_handle_int(), it will be called with irq numbers in the range
109 * from IRQ_AUTO_1 - IRQ_AUTO_7.
111 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
114 *auto_irqhandler_fixup = (u32)handler;
119 * m68k_setup_user_interrupt
120 * @vec: first user vector interrupt to handle
121 * @cnt: number of active user vector interrupts
122 * @handler: called from user vector interrupts
124 * setup user vector interrupts, this includes activating the specified range
125 * of interrupts, only then these interrupts can be requested (note: this is
126 * different from auto vector interrupts). An optional handler can be installed
127 * to be called instead of the default __m68k_handle_int(), it will be called
128 * with irq numbers starting from IRQ_USER.
130 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
131 void (*handler)(unsigned int, struct pt_regs *))
135 m68k_first_user_vec = vec;
136 for (i = 0; i < cnt; i++)
137 irq_controller[IRQ_USER + i] = &user_irq_controller;
138 *user_irqvec_fixup = vec - IRQ_USER;
140 *user_irqhandler_fixup = (u32)handler;
145 * m68k_setup_irq_controller
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_controller(struct irq_controller *contr, unsigned int irq,
159 for (i = 0; i < cnt; i++)
160 irq_controller[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_controller *contr;
182 struct irq_node **prev;
185 if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
186 printk("%s: Incorrect IRQ %d from %s\n",
187 __FUNCTION__, irq, node->devname);
191 spin_lock_irqsave(&contr->lock, flags);
193 prev = irq_list + irq;
195 /* Can't share interrupts unless both agree to */
196 if (!((*prev)->flags & node->flags & IRQF_SHARED)) {
197 spin_unlock_irqrestore(&contr->lock, flags);
201 prev = &(*prev)->next;
204 if (!irq_list[irq]) {
213 spin_unlock_irqrestore(&contr->lock, flags);
218 int request_irq(unsigned int irq,
219 irqreturn_t (*handler) (int, void *),
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_controller *contr;
246 struct irq_node **p, *node;
249 if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
250 printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
254 spin_lock_irqsave(&contr->lock, 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]) {
272 contr->shutdown(irq);
277 spin_unlock_irqrestore(&contr->lock, flags);
280 EXPORT_SYMBOL(free_irq);
282 void enable_irq(unsigned int irq)
284 struct irq_controller *contr;
287 if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
288 printk("%s: Incorrect IRQ %d\n",
293 spin_lock_irqsave(&contr->lock, flags);
294 if (irq_depth[irq]) {
295 if (!--irq_depth[irq]) {
301 spin_unlock_irqrestore(&contr->lock, flags);
304 EXPORT_SYMBOL(enable_irq);
306 void disable_irq(unsigned int irq)
308 struct irq_controller *contr;
311 if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
312 printk("%s: Incorrect IRQ %d\n",
317 spin_lock_irqsave(&contr->lock, flags);
318 if (!irq_depth[irq]++) {
322 spin_unlock_irqrestore(&contr->lock, flags);
325 EXPORT_SYMBOL(disable_irq);
327 int m68k_irq_startup(unsigned int irq)
329 if (irq <= IRQ_AUTO_7)
330 vectors[VEC_SPUR + irq] = auto_inthandler;
332 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
336 void m68k_irq_shutdown(unsigned int irq)
338 if (irq <= IRQ_AUTO_7)
339 vectors[VEC_SPUR + irq] = bad_inthandler;
341 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
346 * Do we need these probe functions on the m68k?
348 * ... may be useful with ISA devices
350 unsigned long probe_irq_on (void)
354 return q40_probe_irq_on();
359 EXPORT_SYMBOL(probe_irq_on);
361 int probe_irq_off (unsigned long irqs)
365 return q40_probe_irq_off(irqs);
370 EXPORT_SYMBOL(probe_irq_off);
372 unsigned int irq_canonicalize(unsigned int irq)
375 if (MACH_IS_Q40 && irq == 11)
381 EXPORT_SYMBOL(irq_canonicalize);
383 asmlinkage void m68k_handle_int(unsigned int irq)
385 struct irq_node *node;
386 kstat_cpu(0).irqs[irq]++;
387 node = irq_list[irq];
389 node->handler(irq, node->dev_id);
394 asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs)
396 struct pt_regs *old_regs;
397 old_regs = set_irq_regs(regs);
398 m68k_handle_int(irq);
399 set_irq_regs(old_regs);
402 asmlinkage void handle_badint(struct pt_regs *regs)
404 kstat_cpu(0).irqs[0]++;
405 printk("unexpected interrupt from %u\n", regs->vector);
408 int show_interrupts(struct seq_file *p, void *v)
410 struct irq_controller *contr;
411 struct irq_node *node;
412 int i = *(loff_t *) v;
414 /* autovector interrupts */
416 contr = irq_controller[i];
418 seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
419 while ((node = node->next))
420 seq_printf(p, ", %s", node->devname);
426 void init_irq_proc(void)
428 /* Insert /proc/irq driver here */