836d1562787ab15394330e78a37baebb99a211c2
[linux-2.6.git] / arch / sparc / kernel / sun4d_irq.c
1 /*  $Id: sun4d_irq.c,v 1.29 2001/12/11 04:55:51 davem Exp $
2  *  arch/sparc/kernel/sun4d_irq.c:
3  *                      SS1000/SC2000 interrupt handling.
4  *
5  *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  *  Heavily based on arch/sparc/kernel/irq.c.
7  */
8
9 #include <linux/errno.h>
10 #include <linux/linkage.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/ptrace.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/init.h>
19 #include <linux/smp.h>
20 #include <linux/smp_lock.h>
21 #include <linux/spinlock.h>
22 #include <linux/seq_file.h>
23
24 #include <asm/ptrace.h>
25 #include <asm/processor.h>
26 #include <asm/system.h>
27 #include <asm/psr.h>
28 #include <asm/smp.h>
29 #include <asm/vaddrs.h>
30 #include <asm/timer.h>
31 #include <asm/openprom.h>
32 #include <asm/oplib.h>
33 #include <asm/traps.h>
34 #include <asm/irq.h>
35 #include <asm/io.h>
36 #include <asm/pgalloc.h>
37 #include <asm/pgtable.h>
38 #include <asm/sbus.h>
39 #include <asm/sbi.h>
40 #include <asm/cacheflush.h>
41 #include <asm/irq_regs.h>
42
43 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
44 /* #define DISTRIBUTE_IRQS */
45
46 struct sun4d_timer_regs *sun4d_timers;
47 #define TIMER_IRQ       10
48
49 #define MAX_STATIC_ALLOC        4
50 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
51 extern int static_irq_count;
52 unsigned char cpu_leds[32];
53 #ifdef CONFIG_SMP
54 unsigned char sbus_tid[32];
55 #endif
56
57 static struct irqaction *irq_action[NR_IRQS];
58 extern spinlock_t irq_action_lock;
59
60 struct sbus_action {
61         struct irqaction *action;
62         /* For SMP this needs to be extended */
63 } *sbus_actions;
64
65 static int pil_to_sbus[] = {
66         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
67 };
68
69 static int sbus_to_pil[] = {
70         0, 2, 3, 5, 7, 9, 11, 13,
71 };
72
73 static int nsbi;
74 #ifdef CONFIG_SMP
75 DEFINE_SPINLOCK(sun4d_imsk_lock);
76 #endif
77
78 int show_sun4d_interrupts(struct seq_file *p, void *v)
79 {
80         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
81         struct irqaction * action;
82         unsigned long flags;
83 #ifdef CONFIG_SMP
84         int x;
85 #endif
86
87         spin_lock_irqsave(&irq_action_lock, flags);
88         if (i < NR_IRQS) {
89                 sbusl = pil_to_sbus[i];
90                 if (!sbusl) {
91                         action = *(i + irq_action);
92                         if (!action) 
93                                 goto out_unlock;
94                 } else {
95                         for (j = 0; j < nsbi; j++) {
96                                 for (k = 0; k < 4; k++)
97                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
98                                                 goto found_it;
99                         }
100                         goto out_unlock;
101                 }
102 found_it:       seq_printf(p, "%3d: ", i);
103 #ifndef CONFIG_SMP
104                 seq_printf(p, "%10u ", kstat_irqs(i));
105 #else
106                 for_each_online_cpu(x)
107                         seq_printf(p, "%10u ",
108                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
109 #endif
110                 seq_printf(p, "%c %s",
111                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
112                         action->name);
113                 action = action->next;
114                 for (;;) {
115                         for (; action; action = action->next) {
116                                 seq_printf(p, ",%s %s",
117                                         (action->flags & IRQF_DISABLED) ? " +" : "",
118                                         action->name);
119                         }
120                         if (!sbusl) break;
121                         k++;
122                         if (k < 4)
123                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
124                         else {
125                                 j++;
126                                 if (j == nsbi) break;
127                                 k = 0;
128                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
129                         }
130                 }
131                 seq_putc(p, '\n');
132         }
133 out_unlock:
134         spin_unlock_irqrestore(&irq_action_lock, flags);
135         return 0;
136 }
137
138 void sun4d_free_irq(unsigned int irq, void *dev_id)
139 {
140         struct irqaction *action, **actionp;
141         struct irqaction *tmp = NULL;
142         unsigned long flags;
143
144         spin_lock_irqsave(&irq_action_lock, flags);
145         if (irq < 15)
146                 actionp = irq + irq_action;
147         else
148                 actionp = &(sbus_actions[irq - (1 << 5)].action);
149         action = *actionp;
150         if (!action) {
151                 printk("Trying to free free IRQ%d\n",irq);
152                 goto out_unlock;
153         }
154         if (dev_id) {
155                 for (; action; action = action->next) {
156                         if (action->dev_id == dev_id)
157                                 break;
158                         tmp = action;
159                 }
160                 if (!action) {
161                         printk("Trying to free free shared IRQ%d\n",irq);
162                         goto out_unlock;
163                 }
164         } else if (action->flags & IRQF_SHARED) {
165                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
166                 goto out_unlock;
167         }
168         if (action->flags & SA_STATIC_ALLOC)
169         {
170                 /* This interrupt is marked as specially allocated
171                  * so it is a bad idea to free it.
172                  */
173                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
174                        irq, action->name);
175                 goto out_unlock;
176         }
177         
178         if (action && tmp)
179                 tmp->next = action->next;
180         else
181                 *actionp = action->next;
182
183         spin_unlock_irqrestore(&irq_action_lock, flags);
184
185         synchronize_irq(irq);
186
187         spin_lock_irqsave(&irq_action_lock, flags);
188
189         kfree(action);
190
191         if (!(*actionp))
192                 disable_irq(irq);
193
194 out_unlock:
195         spin_unlock_irqrestore(&irq_action_lock, flags);
196 }
197
198 extern void unexpected_irq(int, void *, struct pt_regs *);
199
200 void sun4d_handler_irq(int irq, struct pt_regs * regs)
201 {
202         struct pt_regs *old_regs;
203         struct irqaction * action;
204         int cpu = smp_processor_id();
205         /* SBUS IRQ level (1 - 7) */
206         int sbusl = pil_to_sbus[irq];
207         
208         /* FIXME: Is this necessary?? */
209         cc_get_ipen();
210         
211         cc_set_iclr(1 << irq);
212         
213         old_regs = set_irq_regs(regs);
214         irq_enter();
215         kstat_cpu(cpu).irqs[irq]++;
216         if (!sbusl) {
217                 action = *(irq + irq_action);
218                 if (!action)
219                         unexpected_irq(irq, NULL, regs);
220                 do {
221                         action->handler(irq, action->dev_id);
222                         action = action->next;
223                 } while (action);
224         } else {
225                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
226                 int sbino;
227                 struct sbus_action *actionp;
228                 unsigned mask, slot;
229                 int sbil = (sbusl << 2);
230                 
231                 bw_clear_intr_mask(sbusl, bus_mask);
232                 
233                 /* Loop for each pending SBI */
234                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
235                         if (bus_mask & 1) {
236                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
237                                 mask &= (0xf << sbil);
238                                 actionp = sbus_actions + (sbino << 5) + (sbil);
239                                 /* Loop for each pending SBI slot */
240                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
241                                         if (mask & slot) {
242                                                 mask &= ~slot;
243                                                 action = actionp->action;
244                                                 
245                                                 if (!action)
246                                                         unexpected_irq(irq, NULL, regs);
247                                                 do {
248                                                         action->handler(irq, action->dev_id);
249                                                         action = action->next;
250                                                 } while (action);
251                                                 release_sbi(SBI2DEVID(sbino), slot);
252                                         }
253                         }
254         }
255         irq_exit();
256         set_irq_regs(old_regs);
257 }
258
259 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
260 {
261         int sbusl = pil_to_sbus[irq];
262
263         if (sbusl)
264                 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
265         else
266                 return irq;
267 }
268
269 unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
270 {
271         if (sbint >= sizeof(sbus_to_pil)) {
272                 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
273                 BUG();
274         }
275         return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
276 }
277
278 int sun4d_request_irq(unsigned int irq,
279                 irqreturn_t (*handler)(int, void *),
280                 unsigned long irqflags, const char * devname, void *dev_id)
281 {
282         struct irqaction *action, *tmp = NULL, **actionp;
283         unsigned long flags;
284         int ret;
285         
286         if(irq > 14 && irq < (1 << 5)) {
287                 ret = -EINVAL;
288                 goto out;
289         }
290
291         if (!handler) {
292                 ret = -EINVAL;
293                 goto out;
294         }
295
296         spin_lock_irqsave(&irq_action_lock, flags);
297
298         if (irq >= (1 << 5))
299                 actionp = &(sbus_actions[irq - (1 << 5)].action);
300         else
301                 actionp = irq + irq_action;
302         action = *actionp;
303         
304         if (action) {
305                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
306                         for (tmp = action; tmp->next; tmp = tmp->next);
307                 } else {
308                         ret = -EBUSY;
309                         goto out_unlock;
310                 }
311                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
312                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
313                         ret = -EBUSY;
314                         goto out_unlock;
315                 }
316                 action = NULL;          /* Or else! */
317         }
318
319         /* If this is flagged as statically allocated then we use our
320          * private struct which is never freed.
321          */
322         if (irqflags & SA_STATIC_ALLOC) {
323                 if (static_irq_count < MAX_STATIC_ALLOC)
324                         action = &static_irqaction[static_irq_count++];
325                 else
326                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
327         }
328         
329         if (action == NULL)
330                 action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
331                                                      GFP_ATOMIC);
332         
333         if (!action) { 
334                 ret = -ENOMEM;
335                 goto out_unlock;
336         }
337
338         action->handler = handler;
339         action->flags = irqflags;
340         cpus_clear(action->mask);
341         action->name = devname;
342         action->next = NULL;
343         action->dev_id = dev_id;
344
345         if (tmp)
346                 tmp->next = action;
347         else
348                 *actionp = action;
349                 
350         enable_irq(irq);
351
352         ret = 0;
353 out_unlock:
354         spin_unlock_irqrestore(&irq_action_lock, flags);
355 out:
356         return ret;
357 }
358
359 static void sun4d_disable_irq(unsigned int irq)
360 {
361 #ifdef CONFIG_SMP
362         int tid = sbus_tid[(irq >> 5) - 1];
363         unsigned long flags;
364 #endif  
365         
366         if (irq < NR_IRQS) return;
367 #ifdef CONFIG_SMP
368         spin_lock_irqsave(&sun4d_imsk_lock, flags);
369         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
370         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
371 #else           
372         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
373 #endif
374 }
375
376 static void sun4d_enable_irq(unsigned int irq)
377 {
378 #ifdef CONFIG_SMP
379         int tid = sbus_tid[(irq >> 5) - 1];
380         unsigned long flags;
381 #endif  
382         
383         if (irq < NR_IRQS) return;
384 #ifdef CONFIG_SMP
385         spin_lock_irqsave(&sun4d_imsk_lock, flags);
386         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
387         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
388 #else           
389         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
390 #endif
391 }
392
393 #ifdef CONFIG_SMP
394 static void sun4d_set_cpu_int(int cpu, int level)
395 {
396         sun4d_send_ipi(cpu, level);
397 }
398
399 static void sun4d_clear_ipi(int cpu, int level)
400 {
401 }
402
403 static void sun4d_set_udt(int cpu)
404 {
405 }
406
407 /* Setup IRQ distribution scheme. */
408 void __init sun4d_distribute_irqs(void)
409 {
410 #ifdef DISTRIBUTE_IRQS
411         struct sbus_bus *sbus;
412         unsigned long sbus_serving_map;
413
414         sbus_serving_map = cpu_present_map;
415         for_each_sbus(sbus) {
416                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
417                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
418                 else if (cpu_present_map & (1 << (sbus->board * 2)))
419                         sbus_tid[sbus->board] = (sbus->board * 2);
420                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
421                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
422                 else
423                         sbus_tid[sbus->board] = 0xff;
424                 if (sbus_tid[sbus->board] != 0xff)
425                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
426         }
427         for_each_sbus(sbus)
428                 if (sbus_tid[sbus->board] == 0xff) {
429                         int i = 31;
430                                 
431                         if (!sbus_serving_map)
432                                 sbus_serving_map = cpu_present_map;
433                         while (!(sbus_serving_map & (1 << i)))
434                                 i--;
435                         sbus_tid[sbus->board] = i;
436                         sbus_serving_map &= ~(1 << i);
437                 }
438         for_each_sbus(sbus) {
439                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
440                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
441         }
442 #else
443         struct sbus_bus *sbus;
444         int cpuid = cpu_logical_map(1);
445
446         if (cpuid == -1)
447                 cpuid = cpu_logical_map(0);
448         for_each_sbus(sbus) {
449                 sbus_tid[sbus->board] = cpuid;
450                 set_sbi_tid(sbus->devid, cpuid << 3);
451         }
452         printk("All sbus IRQs directed to CPU%d\n", cpuid);
453 #endif
454 }
455 #endif
456  
457 static void sun4d_clear_clock_irq(void)
458 {
459         volatile unsigned int clear_intr;
460         clear_intr = sun4d_timers->l10_timer_limit;
461 }
462
463 static void sun4d_clear_profile_irq(int cpu)
464 {
465         bw_get_prof_limit(cpu);
466 }
467
468 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
469 {
470         bw_set_prof_limit(cpu, limit);
471 }
472
473 static void __init sun4d_init_timers(irqreturn_t (*counter_fn)(int, void *))
474 {
475         int irq;
476         int cpu;
477         struct resource r;
478         int mid;
479
480         /* Map the User Timer registers. */
481         memset(&r, 0, sizeof(r));
482 #ifdef CONFIG_SMP
483         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
484 #else
485         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
486 #endif
487         r.flags = 0xf;
488         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
489             PAGE_SIZE, "user timer");
490
491         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
492         master_l10_counter = &sun4d_timers->l10_cur_count;
493         master_l10_limit = &sun4d_timers->l10_timer_limit;
494
495         irq = request_irq(TIMER_IRQ,
496                           counter_fn,
497                           (IRQF_DISABLED | SA_STATIC_ALLOC),
498                           "timer", NULL);
499         if (irq) {
500                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
501                 prom_halt();
502         }
503         
504         /* Enable user timer free run for CPU 0 in BW */
505         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
506
507         cpu = 0;
508         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
509                 sun4d_load_profile_irq(mid >> 3, 0);
510                 cpu++;
511         }
512                 
513 #ifdef CONFIG_SMP
514         {
515                 unsigned long flags;
516                 extern unsigned long lvl14_save[4];
517                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
518                 extern unsigned int real_irq_entry[], smp4d_ticker[];
519                 extern unsigned int patchme_maybe_smp_msg[];
520
521                 /* Adjust so that we jump directly to smp4d_ticker */
522                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
523
524                 /* For SMP we use the level 14 ticker, however the bootup code
525                  * has copied the firmwares level 14 vector into boot cpu's
526                  * trap table, we must fix this now or we get squashed.
527                  */
528                 local_irq_save(flags);
529                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
530                 trap_table->inst_one = lvl14_save[0];
531                 trap_table->inst_two = lvl14_save[1];
532                 trap_table->inst_three = lvl14_save[2];
533                 trap_table->inst_four = lvl14_save[3];
534                 local_flush_cache_all();
535                 local_irq_restore(flags);
536         }
537 #endif
538 }
539
540 void __init sun4d_init_sbi_irq(void)
541 {
542         struct sbus_bus *sbus;
543         unsigned mask;
544
545         nsbi = 0;
546         for_each_sbus(sbus)
547                 nsbi++;
548         sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
549         memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
550         for_each_sbus(sbus) {
551 #ifdef CONFIG_SMP       
552                 extern unsigned char boot_cpu_id;
553                 
554                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
555                 sbus_tid[sbus->board] = boot_cpu_id;
556 #endif
557                 /* Get rid of pending irqs from PROM */
558                 mask = acquire_sbi(sbus->devid, 0xffffffff);
559                 if (mask) {
560                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
561                         release_sbi(sbus->devid, mask);
562                 }
563         }
564 }
565
566 void __init sun4d_init_IRQ(void)
567 {
568         local_irq_disable();
569
570         BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
571         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
572         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
573         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
574         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
575         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
576         sparc_init_timers = sun4d_init_timers;
577 #ifdef CONFIG_SMP
578         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
579         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
580         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
581 #endif
582         /* Cannot enable interrupts until OBP ticker is disabled. */
583 }