2 * arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
3 * Sparc the IRQs 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/module.h>
15 #include <linux/sched.h>
16 #include <linux/ptrace.h>
17 #include <linux/errno.h>
18 #include <linux/linkage.h>
19 #include <linux/kernel_stat.h>
20 #include <linux/signal.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/random.h>
24 #include <linux/init.h>
25 #include <linux/smp.h>
26 #include <linux/delay.h>
27 #include <linux/threads.h>
28 #include <linux/spinlock.h>
29 #include <linux/seq_file.h>
31 #include <asm/ptrace.h>
32 #include <asm/processor.h>
33 #include <asm/system.h>
36 #include <asm/vaddrs.h>
37 #include <asm/timer.h>
38 #include <asm/openprom.h>
39 #include <asm/oplib.h>
40 #include <asm/traps.h>
43 #include <asm/pgalloc.h>
44 #include <asm/pgtable.h>
46 #include <asm/cacheflush.h>
47 #include <asm/irq_regs.h>
54 #define SMP_NOP2 "nop; nop;\n\t"
55 #define SMP_NOP3 "nop; nop; nop;\n\t"
60 unsigned long __raw_local_irq_save(void)
67 SMP_NOP3 /* Sun4m + Cypress + SMP bug */
71 : "=&r" (retval), "=r" (tmp)
78 void raw_local_irq_enable(void)
84 SMP_NOP3 /* Sun4m + Cypress + SMP bug */
93 void raw_local_irq_restore(unsigned long old_psr)
100 SMP_NOP2 /* Sun4m + Cypress + SMP bug */
101 "andn %0, %1, %0\n\t"
102 "wr %0, %2, %%psr\n\t"
105 : "i" (PSR_PIL), "r" (old_psr)
109 EXPORT_SYMBOL(__raw_local_irq_save);
110 EXPORT_SYMBOL(raw_local_irq_enable);
111 EXPORT_SYMBOL(raw_local_irq_restore);
114 * Dave Redman (djhr@tadpole.co.uk)
116 * IRQ numbers.. These are no longer restricted to 15..
118 * this is done to enable SBUS cards and onboard IO to be masked
119 * correctly. using the interrupt level isn't good enough.
122 * A device interrupting at sbus level6 and the Floppy both come in
123 * at IRQ11, but enabling and disabling them requires writing to
124 * different bits in the SLAVIO/SEC.
126 * As a result of these changes sun4m machines could now support
127 * directed CPU interrupts using the existing enable/disable irq code
132 static void irq_panic(void)
134 extern char *cputypval;
135 prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
139 void (*sparc_init_timers)(irq_handler_t ) =
140 (void (*)(irq_handler_t )) irq_panic;
143 * Dave Redman (djhr@tadpole.co.uk)
145 * There used to be extern calls and hard coded values here.. very sucky!
146 * instead, because some of the devices attach very early, I do something
147 * equally sucky but at least we'll never try to free statically allocated
148 * space or call kmalloc before kmalloc_init :(.
150 * In fact it's the timer10 that attaches first.. then timer14
151 * then kmalloc_init is called.. then the tty interrupts attach.
155 #define MAX_STATIC_ALLOC 4
156 struct irqaction static_irqaction[MAX_STATIC_ALLOC];
157 int static_irq_count;
160 struct irqaction *action;
162 } sparc_irq[NR_IRQS];
163 #define SPARC_IRQ_INPROGRESS 1
165 /* Used to protect the IRQ action lists */
166 DEFINE_SPINLOCK(irq_action_lock);
168 int show_interrupts(struct seq_file *p, void *v)
170 int i = *(loff_t *) v;
171 struct irqaction * action;
177 if (sparc_cpu_model == sun4d) {
178 extern int show_sun4d_interrupts(struct seq_file *, void *);
180 return show_sun4d_interrupts(p, v);
182 spin_lock_irqsave(&irq_action_lock, flags);
184 action = sparc_irq[i].action;
187 seq_printf(p, "%3d: ", i);
189 seq_printf(p, "%10u ", kstat_irqs(i));
191 for_each_online_cpu(j) {
192 seq_printf(p, "%10u ",
193 kstat_cpu(j).irqs[i]);
196 seq_printf(p, " %c %s",
197 (action->flags & IRQF_DISABLED) ? '+' : ' ',
199 for (action=action->next; action; action = action->next) {
200 seq_printf(p, ",%s %s",
201 (action->flags & IRQF_DISABLED) ? " +" : "",
207 spin_unlock_irqrestore(&irq_action_lock, flags);
211 void free_irq(unsigned int irq, void *dev_id)
213 struct irqaction * action;
214 struct irqaction **actionp;
216 unsigned int cpu_irq;
218 if (sparc_cpu_model == sun4d) {
219 extern void sun4d_free_irq(unsigned int, void *);
221 sun4d_free_irq(irq, dev_id);
224 cpu_irq = irq & (NR_IRQS - 1);
225 if (cpu_irq > 14) { /* 14 irq levels on the sparc */
226 printk("Trying to free bogus IRQ %d\n", irq);
230 spin_lock_irqsave(&irq_action_lock, flags);
232 actionp = &sparc_irq[cpu_irq].action;
235 if (!action->handler) {
236 printk("Trying to free free IRQ%d\n",irq);
240 for (; action; action = action->next) {
241 if (action->dev_id == dev_id)
243 actionp = &action->next;
246 printk("Trying to free free shared IRQ%d\n",irq);
249 } else if (action->flags & IRQF_SHARED) {
250 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
253 if (action->flags & SA_STATIC_ALLOC)
255 /* This interrupt is marked as specially allocated
256 * so it is a bad idea to free it.
258 printk("Attempt to free statically allocated IRQ%d (%s)\n",
263 *actionp = action->next;
265 spin_unlock_irqrestore(&irq_action_lock, flags);
267 synchronize_irq(irq);
269 spin_lock_irqsave(&irq_action_lock, flags);
273 if (!sparc_irq[cpu_irq].action)
277 spin_unlock_irqrestore(&irq_action_lock, flags);
280 EXPORT_SYMBOL(free_irq);
283 * This is called when we want to synchronize with
284 * interrupts. We may for example tell a device to
285 * stop sending interrupts: but to make sure there
286 * are no interrupts that are executing on another
287 * CPU we need to call this function.
290 void synchronize_irq(unsigned int irq)
292 unsigned int cpu_irq;
294 cpu_irq = irq & (NR_IRQS - 1);
295 while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
298 EXPORT_SYMBOL(synchronize_irq);
301 void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
304 struct irqaction * action;
305 unsigned int cpu_irq;
307 cpu_irq = irq & (NR_IRQS - 1);
308 action = sparc_irq[cpu_irq].action;
310 printk("IO device interrupt, irq = %d\n", irq);
311 printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
312 regs->npc, regs->u_regs[14]);
314 printk("Expecting: ");
315 for (i = 0; i < 16; i++)
317 printk("[%s:%d:0x%x] ", action->name,
318 (int) i, (unsigned int) action->handler);
321 panic("bogus interrupt received");
324 void handler_irq(int irq, struct pt_regs * regs)
326 struct pt_regs *old_regs;
327 struct irqaction * action;
328 int cpu = smp_processor_id();
330 extern void smp4m_irq_rotate(int cpu);
333 old_regs = set_irq_regs(regs);
335 disable_pil_irq(irq);
337 /* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */
338 if((sparc_cpu_model==sun4m) && (irq < 10))
339 smp4m_irq_rotate(cpu);
341 action = sparc_irq[irq].action;
342 sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
343 kstat_cpu(cpu).irqs[irq]++;
345 if (!action || !action->handler)
346 unexpected_irq(irq, NULL, regs);
347 action->handler(irq, action->dev_id);
348 action = action->next;
350 sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
353 set_irq_regs(old_regs);
356 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
358 /* Fast IRQs on the Sparc can only have one routine attached to them,
359 * thus no sharing possible.
361 static int request_fast_irq(unsigned int irq,
362 void (*handler)(void),
363 unsigned long irqflags, const char *devname)
365 struct irqaction *action;
367 unsigned int cpu_irq;
370 struct tt_entry *trap_table;
371 extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3;
374 cpu_irq = irq & (NR_IRQS - 1);
384 spin_lock_irqsave(&irq_action_lock, flags);
386 action = sparc_irq[cpu_irq].action;
388 if(action->flags & IRQF_SHARED)
389 panic("Trying to register fast irq when already shared.\n");
390 if(irqflags & IRQF_SHARED)
391 panic("Trying to register fast irq as shared.\n");
393 /* Anyway, someone already owns it so cannot be made fast. */
394 printk("request_fast_irq: Trying to register yet already owned.\n");
399 /* If this is flagged as statically allocated then we use our
400 * private struct which is never freed.
402 if (irqflags & SA_STATIC_ALLOC) {
403 if (static_irq_count < MAX_STATIC_ALLOC)
404 action = &static_irqaction[static_irq_count++];
406 printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
411 action = kmalloc(sizeof(struct irqaction),
419 /* Dork with trap table if we get this far. */
420 #define INSTANTIATE(table) \
421 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
422 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
423 SPARC_BRANCH((unsigned long) handler, \
424 (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
425 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
426 table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
428 INSTANTIATE(sparc_ttable)
430 trap_table = &trapbase_cpu1; INSTANTIATE(trap_table)
431 trap_table = &trapbase_cpu2; INSTANTIATE(trap_table)
432 trap_table = &trapbase_cpu3; INSTANTIATE(trap_table)
436 * XXX Correct thing whould be to flush only I- and D-cache lines
437 * which contain the handler in question. But as of time of the
438 * writing we have no CPU-neutral interface to fine-grained flushes.
442 action->flags = irqflags;
443 action->name = devname;
444 action->dev_id = NULL;
447 sparc_irq[cpu_irq].action = action;
453 spin_unlock_irqrestore(&irq_action_lock, flags);
458 /* These variables are used to access state from the assembler
459 * interrupt handler, floppy_hardint, so we cannot put these in
460 * the floppy driver image because that would not work in the
463 volatile unsigned char *fdc_status;
464 EXPORT_SYMBOL(fdc_status);
467 EXPORT_SYMBOL(pdma_vaddr);
469 unsigned long pdma_size;
470 EXPORT_SYMBOL(pdma_size);
472 volatile int doing_pdma;
473 EXPORT_SYMBOL(doing_pdma);
476 EXPORT_SYMBOL(pdma_base);
478 unsigned long pdma_areasize;
479 EXPORT_SYMBOL(pdma_areasize);
481 extern void floppy_hardint(void);
483 static irq_handler_t floppy_irq_handler;
485 void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
487 struct pt_regs *old_regs;
488 int cpu = smp_processor_id();
490 old_regs = set_irq_regs(regs);
491 disable_pil_irq(irq);
493 kstat_cpu(cpu).irqs[irq]++;
494 floppy_irq_handler(irq, dev_id);
497 set_irq_regs(old_regs);
498 // XXX Eek, it's totally changed with preempt_count() and such
499 // if (softirq_pending(cpu))
503 int sparc_floppy_request_irq(int irq, unsigned long flags,
504 irq_handler_t irq_handler)
506 floppy_irq_handler = irq_handler;
507 return request_fast_irq(irq, floppy_hardint, flags, "floppy");
509 EXPORT_SYMBOL(sparc_floppy_request_irq);
513 int request_irq(unsigned int irq,
514 irq_handler_t handler,
515 unsigned long irqflags, const char * devname, void *dev_id)
517 struct irqaction * action, **actionp;
519 unsigned int cpu_irq;
522 if (sparc_cpu_model == sun4d) {
523 extern int sun4d_request_irq(unsigned int,
525 unsigned long, const char *, void *);
526 return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
528 cpu_irq = irq & (NR_IRQS - 1);
538 spin_lock_irqsave(&irq_action_lock, flags);
540 actionp = &sparc_irq[cpu_irq].action;
543 if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
547 if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) {
548 printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
552 for ( ; action; action = *actionp)
553 actionp = &action->next;
556 /* If this is flagged as statically allocated then we use our
557 * private struct which is never freed.
559 if (irqflags & SA_STATIC_ALLOC) {
560 if (static_irq_count < MAX_STATIC_ALLOC)
561 action = &static_irqaction[static_irq_count++];
563 printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
567 action = kmalloc(sizeof(struct irqaction),
575 action->handler = handler;
576 action->flags = irqflags;
577 action->name = devname;
579 action->dev_id = dev_id;
587 spin_unlock_irqrestore(&irq_action_lock, flags);
592 EXPORT_SYMBOL(request_irq);
594 void disable_irq_nosync(unsigned int irq)
598 EXPORT_SYMBOL(disable_irq_nosync);
600 void disable_irq(unsigned int irq)
604 EXPORT_SYMBOL(disable_irq);
606 void enable_irq(unsigned int irq)
611 EXPORT_SYMBOL(enable_irq);
613 /* We really don't need these at all on the Sparc. We only have
614 * stubs here because they are exported to modules.
616 unsigned long probe_irq_on(void)
621 EXPORT_SYMBOL(probe_irq_on);
623 int probe_irq_off(unsigned long mask)
628 EXPORT_SYMBOL(probe_irq_off);
631 * This could probably be made indirect too and assigned in the CPU
632 * bits of the code. That would be much nicer I think and would also
633 * fit in with the idea of being able to tune your kernel for your machine
634 * by removing unrequired machine and device support.
638 void __init init_IRQ(void)
640 extern void sun4c_init_IRQ( void );
641 extern void sun4m_init_IRQ( void );
642 extern void sun4d_init_IRQ( void );
644 switch(sparc_cpu_model) {
653 if (pcic_present()) {
654 sun4m_pci_init_IRQ();
670 prom_printf("Cannot initialize IRQs on this Sun machine...");
676 #ifdef CONFIG_PROC_FS
677 void init_irq_proc(void)
679 /* For now, nothing... */
681 #endif /* CONFIG_PROC_FS */