1 /* $Id: irq.c,v 1.114 2001/12/11 04:55:51 davem Exp $
2 * arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
3 * Sparc the IRQ's are basically 'cast in stone'
4 * and you are supposed to probe the prom's device
5 * node trees to find out who's got which IRQ.
7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
9 * Copyright (C) 1995,2002 Pete A. Zaitcev (zaitcev@yahoo.com)
10 * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
11 * Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
14 #include <linux/config.h>
15 #include <linux/module.h>
16 #include <linux/sched.h>
17 #include <linux/ptrace.h>
18 #include <linux/errno.h>
19 #include <linux/linkage.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/signal.h>
22 #include <linux/sched.h>
23 #include <linux/interrupt.h>
24 #include <linux/slab.h>
25 #include <linux/random.h>
26 #include <linux/init.h>
27 #include <linux/smp.h>
28 #include <linux/smp_lock.h>
29 #include <linux/delay.h>
30 #include <linux/threads.h>
31 #include <linux/spinlock.h>
32 #include <linux/seq_file.h>
34 #include <asm/ptrace.h>
35 #include <asm/processor.h>
36 #include <asm/system.h>
39 #include <asm/vaddrs.h>
40 #include <asm/timer.h>
41 #include <asm/openprom.h>
42 #include <asm/oplib.h>
43 #include <asm/traps.h>
46 #include <asm/pgalloc.h>
47 #include <asm/pgtable.h>
49 #include <asm/cacheflush.h>
52 #define SMP_NOP2 "nop; nop;\n\t"
53 #define SMP_NOP3 "nop; nop; nop;\n\t"
58 unsigned long __local_irq_save(void)
65 SMP_NOP3 /* Sun4m + Cypress + SMP bug */
69 : "=&r" (retval), "=r" (tmp)
76 void local_irq_enable(void)
82 SMP_NOP3 /* Sun4m + Cypress + SMP bug */
91 void local_irq_restore(unsigned long old_psr)
98 SMP_NOP2 /* Sun4m + Cypress + SMP bug */
100 "wr %0, %2, %%psr\n\t"
103 : "i" (PSR_PIL), "r" (old_psr)
107 EXPORT_SYMBOL(__local_irq_save);
108 EXPORT_SYMBOL(local_irq_enable);
109 EXPORT_SYMBOL(local_irq_restore);
112 * Dave Redman (djhr@tadpole.co.uk)
114 * IRQ numbers.. These are no longer restricted to 15..
116 * this is done to enable SBUS cards and onboard IO to be masked
117 * correctly. using the interrupt level isn't good enough.
120 * A device interrupting at sbus level6 and the Floppy both come in
121 * at IRQ11, but enabling and disabling them requires writing to
122 * different bits in the SLAVIO/SEC.
124 * As a result of these changes sun4m machines could now support
125 * directed CPU interrupts using the existing enable/disable irq code
130 static void irq_panic(void)
132 extern char *cputypval;
133 prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
137 void (*sparc_init_timers)(irqreturn_t (*)(int, void *,struct pt_regs *)) =
138 (void (*)(irqreturn_t (*)(int, void *,struct pt_regs *))) irq_panic;
141 * Dave Redman (djhr@tadpole.co.uk)
143 * There used to be extern calls and hard coded values here.. very sucky!
144 * instead, because some of the devices attach very early, I do something
145 * equally sucky but at least we'll never try to free statically allocated
146 * space or call kmalloc before kmalloc_init :(.
148 * In fact it's the timer10 that attaches first.. then timer14
149 * then kmalloc_init is called.. then the tty interrupts attach.
153 #define MAX_STATIC_ALLOC 4
154 struct irqaction static_irqaction[MAX_STATIC_ALLOC];
155 int static_irq_count;
157 struct irqaction *irq_action[NR_IRQS] = {
158 [0 ... (NR_IRQS-1)] = NULL
161 /* Used to protect the IRQ action lists */
162 DEFINE_SPINLOCK(irq_action_lock);
164 int show_interrupts(struct seq_file *p, void *v)
166 int i = *(loff_t *) v;
167 struct irqaction * action;
173 if (sparc_cpu_model == sun4d) {
174 extern int show_sun4d_interrupts(struct seq_file *, void *);
176 return show_sun4d_interrupts(p, v);
178 spin_lock_irqsave(&irq_action_lock, flags);
180 action = *(i + irq_action);
183 seq_printf(p, "%3d: ", i);
185 seq_printf(p, "%10u ", kstat_irqs(i));
187 for (j = 0; j < NR_CPUS; j++) {
189 seq_printf(p, "%10u ",
190 kstat_cpu(cpu_logical_map(j)).irqs[i]);
193 seq_printf(p, " %c %s",
194 (action->flags & SA_INTERRUPT) ? '+' : ' ',
196 for (action=action->next; action; action = action->next) {
197 seq_printf(p, ",%s %s",
198 (action->flags & SA_INTERRUPT) ? " +" : "",
204 spin_unlock_irqrestore(&irq_action_lock, flags);
208 void free_irq(unsigned int irq, void *dev_id)
210 struct irqaction * action;
211 struct irqaction * tmp = NULL;
213 unsigned int cpu_irq;
215 if (sparc_cpu_model == sun4d) {
216 extern void sun4d_free_irq(unsigned int, void *);
218 sun4d_free_irq(irq, dev_id);
221 cpu_irq = irq & (NR_IRQS - 1);
222 if (cpu_irq > 14) { /* 14 irq levels on the sparc */
223 printk("Trying to free bogus IRQ %d\n", irq);
227 spin_lock_irqsave(&irq_action_lock, flags);
229 action = *(cpu_irq + irq_action);
231 if (!action->handler) {
232 printk("Trying to free free IRQ%d\n",irq);
236 for (; action; action = action->next) {
237 if (action->dev_id == dev_id)
242 printk("Trying to free free shared IRQ%d\n",irq);
245 } else if (action->flags & SA_SHIRQ) {
246 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
249 if (action->flags & SA_STATIC_ALLOC)
251 /* This interrupt is marked as specially allocated
252 * so it is a bad idea to free it.
254 printk("Attempt to free statically allocated IRQ%d (%s)\n",
260 tmp->next = action->next;
262 *(cpu_irq + irq_action) = action->next;
264 spin_unlock_irqrestore(&irq_action_lock, flags);
266 synchronize_irq(irq);
268 spin_lock_irqsave(&irq_action_lock, flags);
272 if (!(*(cpu_irq + irq_action)))
276 spin_unlock_irqrestore(&irq_action_lock, flags);
279 EXPORT_SYMBOL(free_irq);
282 * This is called when we want to synchronize with
283 * interrupts. We may for example tell a device to
284 * stop sending interrupts: but to make sure there
285 * are no interrupts that are executing on another
286 * CPU we need to call this function.
289 void synchronize_irq(unsigned int irq)
291 printk("synchronize_irq says: implement me!\n");
296 void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
299 struct irqaction * action;
300 unsigned int cpu_irq;
302 cpu_irq = irq & (NR_IRQS - 1);
303 action = *(cpu_irq + irq_action);
305 printk("IO device interrupt, irq = %d\n", irq);
306 printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
307 regs->npc, regs->u_regs[14]);
309 printk("Expecting: ");
310 for (i = 0; i < 16; i++)
312 printk("[%s:%d:0x%x] ", action->name,
313 (int) i, (unsigned int) action->handler);
316 panic("bogus interrupt received");
319 void handler_irq(int irq, struct pt_regs * regs)
321 struct irqaction * action;
322 int cpu = smp_processor_id();
324 extern void smp4m_irq_rotate(int cpu);
328 disable_pil_irq(irq);
330 /* Only rotate on lower priority IRQ's (scsi, ethernet, etc.). */
332 smp4m_irq_rotate(cpu);
334 action = *(irq + irq_action);
335 kstat_cpu(cpu).irqs[irq]++;
337 if (!action || !action->handler)
338 unexpected_irq(irq, NULL, regs);
339 action->handler(irq, action->dev_id, regs);
340 action = action->next;
346 #ifdef CONFIG_BLK_DEV_FD
347 extern void floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
349 void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
351 int cpu = smp_processor_id();
353 disable_pil_irq(irq);
355 kstat_cpu(cpu).irqs[irq]++;
356 floppy_interrupt(irq, dev_id, regs);
359 // XXX Eek, it's totally changed with preempt_count() and such
360 // if (softirq_pending(cpu))
365 /* Fast IRQ's on the Sparc can only have one routine attached to them,
366 * thus no sharing possible.
368 int request_fast_irq(unsigned int irq,
369 irqreturn_t (*handler)(int, void *, struct pt_regs *),
370 unsigned long irqflags, const char *devname)
372 struct irqaction *action;
374 unsigned int cpu_irq;
377 struct tt_entry *trap_table;
378 extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3;
381 cpu_irq = irq & (NR_IRQS - 1);
391 spin_lock_irqsave(&irq_action_lock, flags);
393 action = *(cpu_irq + irq_action);
395 if(action->flags & SA_SHIRQ)
396 panic("Trying to register fast irq when already shared.\n");
397 if(irqflags & SA_SHIRQ)
398 panic("Trying to register fast irq as shared.\n");
400 /* Anyway, someone already owns it so cannot be made fast. */
401 printk("request_fast_irq: Trying to register yet already owned.\n");
406 /* If this is flagged as statically allocated then we use our
407 * private struct which is never freed.
409 if (irqflags & SA_STATIC_ALLOC) {
410 if (static_irq_count < MAX_STATIC_ALLOC)
411 action = &static_irqaction[static_irq_count++];
413 printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
418 action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
426 /* Dork with trap table if we get this far. */
427 #define INSTANTIATE(table) \
428 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
429 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
430 SPARC_BRANCH((unsigned long) handler, \
431 (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
432 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
433 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
435 INSTANTIATE(sparc_ttable)
437 trap_table = &trapbase_cpu1; INSTANTIATE(trap_table)
438 trap_table = &trapbase_cpu2; INSTANTIATE(trap_table)
439 trap_table = &trapbase_cpu3; INSTANTIATE(trap_table)
443 * XXX Correct thing whould be to flush only I- and D-cache lines
444 * which contain the handler in question. But as of time of the
445 * writing we have no CPU-neutral interface to fine-grained flushes.
449 action->handler = handler;
450 action->flags = irqflags;
451 cpus_clear(action->mask);
452 action->name = devname;
453 action->dev_id = NULL;
456 *(cpu_irq + irq_action) = action;
462 spin_unlock_irqrestore(&irq_action_lock, flags);
467 int request_irq(unsigned int irq,
468 irqreturn_t (*handler)(int, void *, struct pt_regs *),
469 unsigned long irqflags, const char * devname, void *dev_id)
471 struct irqaction * action, *tmp = NULL;
473 unsigned int cpu_irq;
476 if (sparc_cpu_model == sun4d) {
477 extern int sun4d_request_irq(unsigned int,
478 irqreturn_t (*)(int, void *, struct pt_regs *),
479 unsigned long, const char *, void *);
480 return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
482 cpu_irq = irq & (NR_IRQS - 1);
492 spin_lock_irqsave(&irq_action_lock, flags);
494 action = *(cpu_irq + irq_action);
496 if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
497 for (tmp = action; tmp->next; tmp = tmp->next);
502 if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
503 printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
507 action = NULL; /* Or else! */
510 /* If this is flagged as statically allocated then we use our
511 * private struct which is never freed.
513 if (irqflags & SA_STATIC_ALLOC) {
514 if (static_irq_count < MAX_STATIC_ALLOC)
515 action = &static_irqaction[static_irq_count++];
517 printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
521 action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
529 action->handler = handler;
530 action->flags = irqflags;
531 cpus_clear(action->mask);
532 action->name = devname;
534 action->dev_id = dev_id;
539 *(cpu_irq + irq_action) = action;
545 spin_unlock_irqrestore(&irq_action_lock, flags);
550 EXPORT_SYMBOL(request_irq);
552 /* We really don't need these at all on the Sparc. We only have
553 * stubs here because they are exported to modules.
555 unsigned long probe_irq_on(void)
560 EXPORT_SYMBOL(probe_irq_on);
562 int probe_irq_off(unsigned long mask)
567 EXPORT_SYMBOL(probe_irq_off);
570 * This could probably be made indirect too and assigned in the CPU
571 * bits of the code. That would be much nicer I think and would also
572 * fit in with the idea of being able to tune your kernel for your machine
573 * by removing unrequired machine and device support.
577 void __init init_IRQ(void)
579 extern void sun4c_init_IRQ( void );
580 extern void sun4m_init_IRQ( void );
581 extern void sun4d_init_IRQ( void );
583 switch(sparc_cpu_model) {
592 if (pcic_present()) {
593 sun4m_pci_init_IRQ();
605 prom_printf("Cannot initialize IRQ's on this Sun machine...");
611 void init_irq_proc(void)
613 /* For now, nothing... */