ae4dfc89ca522c5f59255446a821358aba617d34
[linux-2.6.git] / arch / sparc / kernel / irq.c
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.
6  *
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)
12  */
13
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/sched.h>
22 #include <linux/interrupt.h>
23 #include <linux/slab.h>
24 #include <linux/random.h>
25 #include <linux/init.h>
26 #include <linux/smp.h>
27 #include <linux/smp_lock.h>
28 #include <linux/delay.h>
29 #include <linux/threads.h>
30 #include <linux/spinlock.h>
31 #include <linux/seq_file.h>
32
33 #include <asm/ptrace.h>
34 #include <asm/processor.h>
35 #include <asm/system.h>
36 #include <asm/psr.h>
37 #include <asm/smp.h>
38 #include <asm/vaddrs.h>
39 #include <asm/timer.h>
40 #include <asm/openprom.h>
41 #include <asm/oplib.h>
42 #include <asm/traps.h>
43 #include <asm/irq.h>
44 #include <asm/io.h>
45 #include <asm/pgalloc.h>
46 #include <asm/pgtable.h>
47 #include <asm/pcic.h>
48 #include <asm/cacheflush.h>
49 #include <asm/irq_regs.h>
50
51 #ifdef CONFIG_SMP
52 #define SMP_NOP2 "nop; nop;\n\t"
53 #define SMP_NOP3 "nop; nop; nop;\n\t"
54 #else
55 #define SMP_NOP2
56 #define SMP_NOP3
57 #endif /* SMP */
58 unsigned long __local_irq_save(void)
59 {
60         unsigned long retval;
61         unsigned long tmp;
62
63         __asm__ __volatile__(
64                 "rd     %%psr, %0\n\t"
65                 SMP_NOP3        /* Sun4m + Cypress + SMP bug */
66                 "or     %0, %2, %1\n\t"
67                 "wr     %1, 0, %%psr\n\t"
68                 "nop; nop; nop\n"
69                 : "=&r" (retval), "=r" (tmp)
70                 : "i" (PSR_PIL)
71                 : "memory");
72
73         return retval;
74 }
75
76 void local_irq_enable(void)
77 {
78         unsigned long tmp;
79
80         __asm__ __volatile__(
81                 "rd     %%psr, %0\n\t"
82                 SMP_NOP3        /* Sun4m + Cypress + SMP bug */
83                 "andn   %0, %1, %0\n\t"
84                 "wr     %0, 0, %%psr\n\t"
85                 "nop; nop; nop\n"
86                 : "=&r" (tmp)
87                 : "i" (PSR_PIL)
88                 : "memory");
89 }
90
91 void local_irq_restore(unsigned long old_psr)
92 {
93         unsigned long tmp;
94
95         __asm__ __volatile__(
96                 "rd     %%psr, %0\n\t"
97                 "and    %2, %1, %2\n\t"
98                 SMP_NOP2        /* Sun4m + Cypress + SMP bug */
99                 "andn   %0, %1, %0\n\t"
100                 "wr     %0, %2, %%psr\n\t"
101                 "nop; nop; nop\n"
102                 : "=&r" (tmp)
103                 : "i" (PSR_PIL), "r" (old_psr)
104                 : "memory");
105 }
106
107 EXPORT_SYMBOL(__local_irq_save);
108 EXPORT_SYMBOL(local_irq_enable);
109 EXPORT_SYMBOL(local_irq_restore);
110
111 /*
112  * Dave Redman (djhr@tadpole.co.uk)
113  *
114  * IRQ numbers.. These are no longer restricted to 15..
115  *
116  * this is done to enable SBUS cards and onboard IO to be masked
117  * correctly. using the interrupt level isn't good enough.
118  *
119  * For example:
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.
123  *
124  * As a result of these changes sun4m machines could now support
125  * directed CPU interrupts using the existing enable/disable irq code
126  * with tweaks.
127  *
128  */
129
130 static void irq_panic(void)
131 {
132     extern char *cputypval;
133     prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
134     prom_halt();
135 }
136
137 void (*sparc_init_timers)(irqreturn_t (*)(int, void *)) =
138     (void (*)(irqreturn_t (*)(int, void *))) irq_panic;
139
140 /*
141  * Dave Redman (djhr@tadpole.co.uk)
142  *
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 :(.
147  * 
148  * In fact it's the timer10 that attaches first.. then timer14
149  * then kmalloc_init is called.. then the tty interrupts attach.
150  * hmmm....
151  *
152  */
153 #define MAX_STATIC_ALLOC        4
154 struct irqaction static_irqaction[MAX_STATIC_ALLOC];
155 int static_irq_count;
156
157 struct {
158         struct irqaction *action;
159         int flags;
160 } sparc_irq[NR_IRQS];
161 #define SPARC_IRQ_INPROGRESS 1
162
163 /* Used to protect the IRQ action lists */
164 DEFINE_SPINLOCK(irq_action_lock);
165
166 int show_interrupts(struct seq_file *p, void *v)
167 {
168         int i = *(loff_t *) v;
169         struct irqaction * action;
170         unsigned long flags;
171 #ifdef CONFIG_SMP
172         int j;
173 #endif
174
175         if (sparc_cpu_model == sun4d) {
176                 extern int show_sun4d_interrupts(struct seq_file *, void *);
177                 
178                 return show_sun4d_interrupts(p, v);
179         }
180         spin_lock_irqsave(&irq_action_lock, flags);
181         if (i < NR_IRQS) {
182                 action = sparc_irq[i].action;
183                 if (!action) 
184                         goto out_unlock;
185                 seq_printf(p, "%3d: ", i);
186 #ifndef CONFIG_SMP
187                 seq_printf(p, "%10u ", kstat_irqs(i));
188 #else
189                 for_each_online_cpu(j) {
190                         seq_printf(p, "%10u ",
191                                     kstat_cpu(j).irqs[i]);
192                 }
193 #endif
194                 seq_printf(p, " %c %s",
195                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
196                         action->name);
197                 for (action=action->next; action; action = action->next) {
198                         seq_printf(p, ",%s %s",
199                                 (action->flags & IRQF_DISABLED) ? " +" : "",
200                                 action->name);
201                 }
202                 seq_putc(p, '\n');
203         }
204 out_unlock:
205         spin_unlock_irqrestore(&irq_action_lock, flags);
206         return 0;
207 }
208
209 void free_irq(unsigned int irq, void *dev_id)
210 {
211         struct irqaction * action;
212         struct irqaction **actionp;
213         unsigned long flags;
214         unsigned int cpu_irq;
215         
216         if (sparc_cpu_model == sun4d) {
217                 extern void sun4d_free_irq(unsigned int, void *);
218                 
219                 sun4d_free_irq(irq, dev_id);
220                 return;
221         }
222         cpu_irq = irq & (NR_IRQS - 1);
223         if (cpu_irq > 14) {  /* 14 irq levels on the sparc */
224                 printk("Trying to free bogus IRQ %d\n", irq);
225                 return;
226         }
227
228         spin_lock_irqsave(&irq_action_lock, flags);
229
230         actionp = &sparc_irq[cpu_irq].action;
231         action = *actionp;
232
233         if (!action->handler) {
234                 printk("Trying to free free IRQ%d\n",irq);
235                 goto out_unlock;
236         }
237         if (dev_id) {
238                 for (; action; action = action->next) {
239                         if (action->dev_id == dev_id)
240                                 break;
241                         actionp = &action->next;
242                 }
243                 if (!action) {
244                         printk("Trying to free free shared IRQ%d\n",irq);
245                         goto out_unlock;
246                 }
247         } else if (action->flags & IRQF_SHARED) {
248                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
249                 goto out_unlock;
250         }
251         if (action->flags & SA_STATIC_ALLOC)
252         {
253                 /* This interrupt is marked as specially allocated
254                  * so it is a bad idea to free it.
255                  */
256                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
257                        irq, action->name);
258                 goto out_unlock;
259         }
260
261         *actionp = action->next;
262
263         spin_unlock_irqrestore(&irq_action_lock, flags);
264
265         synchronize_irq(irq);
266
267         spin_lock_irqsave(&irq_action_lock, flags);
268
269         kfree(action);
270
271         if (!sparc_irq[cpu_irq].action)
272                 disable_irq(irq);
273
274 out_unlock:
275         spin_unlock_irqrestore(&irq_action_lock, flags);
276 }
277
278 EXPORT_SYMBOL(free_irq);
279
280 /*
281  * This is called when we want to synchronize with
282  * interrupts. We may for example tell a device to
283  * stop sending interrupts: but to make sure there
284  * are no interrupts that are executing on another
285  * CPU we need to call this function.
286  */
287 #ifdef CONFIG_SMP
288 void synchronize_irq(unsigned int irq)
289 {
290         unsigned int cpu_irq;
291
292         cpu_irq = irq & (NR_IRQS - 1);
293         while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
294                 cpu_relax();
295 }
296 #endif /* SMP */
297
298 void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
299 {
300         int i;
301         struct irqaction * action;
302         unsigned int cpu_irq;
303         
304         cpu_irq = irq & (NR_IRQS - 1);
305         action = sparc_irq[cpu_irq].action;
306
307         printk("IO device interrupt, irq = %d\n", irq);
308         printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc, 
309                     regs->npc, regs->u_regs[14]);
310         if (action) {
311                 printk("Expecting: ");
312                 for (i = 0; i < 16; i++)
313                         if (action->handler)
314                                 printk("[%s:%d:0x%x] ", action->name,
315                                        (int) i, (unsigned int) action->handler);
316         }
317         printk("AIEEE\n");
318         panic("bogus interrupt received");
319 }
320
321 void handler_irq(int irq, struct pt_regs * regs)
322 {
323         struct pt_regs *old_regs;
324         struct irqaction * action;
325         int cpu = smp_processor_id();
326 #ifdef CONFIG_SMP
327         extern void smp4m_irq_rotate(int cpu);
328 #endif
329
330         old_regs = set_irq_regs(regs);
331         irq_enter();
332         disable_pil_irq(irq);
333 #ifdef CONFIG_SMP
334         /* Only rotate on lower priority IRQ's (scsi, ethernet, etc.). */
335         if((sparc_cpu_model==sun4m) && (irq < 10))
336                 smp4m_irq_rotate(cpu);
337 #endif
338         action = sparc_irq[irq].action;
339         sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
340         kstat_cpu(cpu).irqs[irq]++;
341         do {
342                 if (!action || !action->handler)
343                         unexpected_irq(irq, NULL, regs);
344                 action->handler(irq, action->dev_id);
345                 action = action->next;
346         } while (action);
347         sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
348         enable_pil_irq(irq);
349         irq_exit();
350         set_irq_regs(old_regs);
351 }
352
353 #ifdef CONFIG_BLK_DEV_FD
354 extern void floppy_interrupt(int irq, void *dev_id)
355
356 void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
357 {
358         struct pt_regs *old_regs;
359         int cpu = smp_processor_id();
360
361         old_regs = set_irq_regs(regs);
362         disable_pil_irq(irq);
363         irq_enter();
364         kstat_cpu(cpu).irqs[irq]++;
365         floppy_interrupt(irq, dev_id);
366         irq_exit();
367         enable_pil_irq(irq);
368         set_irq_regs(old_regs);
369         // XXX Eek, it's totally changed with preempt_count() and such
370         // if (softirq_pending(cpu))
371         //      do_softirq();
372 }
373 #endif
374
375 /* Fast IRQ's on the Sparc can only have one routine attached to them,
376  * thus no sharing possible.
377  */
378 int request_fast_irq(unsigned int irq,
379                      irqreturn_t (*handler)(int, void *),
380                      unsigned long irqflags, const char *devname)
381 {
382         struct irqaction *action;
383         unsigned long flags;
384         unsigned int cpu_irq;
385         int ret;
386 #ifdef CONFIG_SMP
387         struct tt_entry *trap_table;
388         extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3;
389 #endif
390         
391         cpu_irq = irq & (NR_IRQS - 1);
392         if(cpu_irq > 14) {
393                 ret = -EINVAL;
394                 goto out;
395         }
396         if(!handler) {
397                 ret = -EINVAL;
398                 goto out;
399         }
400
401         spin_lock_irqsave(&irq_action_lock, flags);
402
403         action = sparc_irq[cpu_irq].action;
404         if(action) {
405                 if(action->flags & IRQF_SHARED)
406                         panic("Trying to register fast irq when already shared.\n");
407                 if(irqflags & IRQF_SHARED)
408                         panic("Trying to register fast irq as shared.\n");
409
410                 /* Anyway, someone already owns it so cannot be made fast. */
411                 printk("request_fast_irq: Trying to register yet already owned.\n");
412                 ret = -EBUSY;
413                 goto out_unlock;
414         }
415
416         /* If this is flagged as statically allocated then we use our
417          * private struct which is never freed.
418          */
419         if (irqflags & SA_STATIC_ALLOC) {
420             if (static_irq_count < MAX_STATIC_ALLOC)
421                 action = &static_irqaction[static_irq_count++];
422             else
423                 printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
424                        irq, devname);
425         }
426         
427         if (action == NULL)
428             action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
429                                                  GFP_ATOMIC);
430         
431         if (!action) { 
432                 ret = -ENOMEM;
433                 goto out_unlock;
434         }
435
436         /* Dork with trap table if we get this far. */
437 #define INSTANTIATE(table) \
438         table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
439         table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
440                 SPARC_BRANCH((unsigned long) handler, \
441                              (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
442         table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
443         table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
444
445         INSTANTIATE(sparc_ttable)
446 #ifdef CONFIG_SMP
447         trap_table = &trapbase_cpu1; INSTANTIATE(trap_table)
448         trap_table = &trapbase_cpu2; INSTANTIATE(trap_table)
449         trap_table = &trapbase_cpu3; INSTANTIATE(trap_table)
450 #endif
451 #undef INSTANTIATE
452         /*
453          * XXX Correct thing whould be to flush only I- and D-cache lines
454          * which contain the handler in question. But as of time of the
455          * writing we have no CPU-neutral interface to fine-grained flushes.
456          */
457         flush_cache_all();
458
459         action->handler = handler;
460         action->flags = irqflags;
461         cpus_clear(action->mask);
462         action->name = devname;
463         action->dev_id = NULL;
464         action->next = NULL;
465
466         sparc_irq[cpu_irq].action = action;
467
468         enable_irq(irq);
469
470         ret = 0;
471 out_unlock:
472         spin_unlock_irqrestore(&irq_action_lock, flags);
473 out:
474         return ret;
475 }
476
477 int request_irq(unsigned int irq,
478                 irqreturn_t (*handler)(int, void *),
479                 unsigned long irqflags, const char * devname, void *dev_id)
480 {
481         struct irqaction * action, **actionp;
482         unsigned long flags;
483         unsigned int cpu_irq;
484         int ret;
485         
486         if (sparc_cpu_model == sun4d) {
487                 extern int sun4d_request_irq(unsigned int, 
488                                              irqreturn_t (*)(int, void *),
489                                              unsigned long, const char *, void *);
490                 return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
491         }
492         cpu_irq = irq & (NR_IRQS - 1);
493         if(cpu_irq > 14) {
494                 ret = -EINVAL;
495                 goto out;
496         }
497         if (!handler) {
498                 ret = -EINVAL;
499                 goto out;
500         }
501             
502         spin_lock_irqsave(&irq_action_lock, flags);
503
504         actionp = &sparc_irq[cpu_irq].action;
505         action = *actionp;
506         if (action) {
507                 if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
508                         ret = -EBUSY;
509                         goto out_unlock;
510                 }
511                 if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) {
512                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
513                         ret = -EBUSY;
514                         goto out_unlock;
515                 }
516                 for ( ; action; action = *actionp)
517                         actionp = &action->next;
518         }
519
520         /* If this is flagged as statically allocated then we use our
521          * private struct which is never freed.
522          */
523         if (irqflags & SA_STATIC_ALLOC) {
524                 if (static_irq_count < MAX_STATIC_ALLOC)
525                         action = &static_irqaction[static_irq_count++];
526                 else
527                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
528         }
529         
530         if (action == NULL)
531                 action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
532                                                      GFP_ATOMIC);
533         
534         if (!action) { 
535                 ret = -ENOMEM;
536                 goto out_unlock;
537         }
538
539         action->handler = handler;
540         action->flags = irqflags;
541         cpus_clear(action->mask);
542         action->name = devname;
543         action->next = NULL;
544         action->dev_id = dev_id;
545
546         *actionp = action;
547
548         enable_irq(irq);
549
550         ret = 0;
551 out_unlock:
552         spin_unlock_irqrestore(&irq_action_lock, flags);
553 out:
554         return ret;
555 }
556
557 EXPORT_SYMBOL(request_irq);
558
559 /* We really don't need these at all on the Sparc.  We only have
560  * stubs here because they are exported to modules.
561  */
562 unsigned long probe_irq_on(void)
563 {
564         return 0;
565 }
566
567 EXPORT_SYMBOL(probe_irq_on);
568
569 int probe_irq_off(unsigned long mask)
570 {
571         return 0;
572 }
573
574 EXPORT_SYMBOL(probe_irq_off);
575
576 /* djhr
577  * This could probably be made indirect too and assigned in the CPU
578  * bits of the code. That would be much nicer I think and would also
579  * fit in with the idea of being able to tune your kernel for your machine
580  * by removing unrequired machine and device support.
581  *
582  */
583
584 void __init init_IRQ(void)
585 {
586         extern void sun4c_init_IRQ( void );
587         extern void sun4m_init_IRQ( void );
588         extern void sun4d_init_IRQ( void );
589
590         switch(sparc_cpu_model) {
591         case sun4c:
592         case sun4:
593                 sun4c_init_IRQ();
594                 break;
595
596         case sun4m:
597 #ifdef CONFIG_PCI
598                 pcic_probe();
599                 if (pcic_present()) {
600                         sun4m_pci_init_IRQ();
601                         break;
602                 }
603 #endif
604                 sun4m_init_IRQ();
605                 break;
606                 
607         case sun4d:
608                 sun4d_init_IRQ();
609                 break;
610
611         default:
612                 prom_printf("Cannot initialize IRQ's on this Sun machine...");
613                 break;
614         }
615         btfixup();
616 }
617
618 void init_irq_proc(void)
619 {
620         /* For now, nothing... */
621 }