sparc: Kill SBUS layer IRQ hooks.
[linux-2.6] / arch / sparc / kernel / sun4d_irq.c
1 /*
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/spinlock.h>
21 #include <linux/seq_file.h>
22
23 #include <asm/ptrace.h>
24 #include <asm/processor.h>
25 #include <asm/system.h>
26 #include <asm/psr.h>
27 #include <asm/smp.h>
28 #include <asm/vaddrs.h>
29 #include <asm/timer.h>
30 #include <asm/openprom.h>
31 #include <asm/oplib.h>
32 #include <asm/traps.h>
33 #include <asm/irq.h>
34 #include <asm/io.h>
35 #include <asm/pgalloc.h>
36 #include <asm/pgtable.h>
37 #include <asm/sbus.h>
38 #include <asm/sbi.h>
39 #include <asm/cacheflush.h>
40 #include <asm/irq_regs.h>
41
42 #include "irq.h"
43
44 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
45 /* #define DISTRIBUTE_IRQS */
46
47 struct sun4d_timer_regs *sun4d_timers;
48 #define TIMER_IRQ       10
49
50 #define MAX_STATIC_ALLOC        4
51 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
52 extern int static_irq_count;
53 unsigned char cpu_leds[32];
54 #ifdef CONFIG_SMP
55 static unsigned char sbus_tid[32];
56 #endif
57
58 static struct irqaction *irq_action[NR_IRQS];
59 extern spinlock_t irq_action_lock;
60
61 static struct sbus_action {
62         struct irqaction *action;
63         /* For SMP this needs to be extended */
64 } *sbus_actions;
65
66 static int pil_to_sbus[] = {
67         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
68 };
69
70 static int sbus_to_pil[] = {
71         0, 2, 3, 5, 7, 9, 11, 13,
72 };
73
74 static int nsbi;
75 #ifdef CONFIG_SMP
76 DEFINE_SPINLOCK(sun4d_imsk_lock);
77 #endif
78
79 int show_sun4d_interrupts(struct seq_file *p, void *v)
80 {
81         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
82         struct irqaction * action;
83         unsigned long flags;
84 #ifdef CONFIG_SMP
85         int x;
86 #endif
87
88         spin_lock_irqsave(&irq_action_lock, flags);
89         if (i < NR_IRQS) {
90                 sbusl = pil_to_sbus[i];
91                 if (!sbusl) {
92                         action = *(i + irq_action);
93                         if (!action) 
94                                 goto out_unlock;
95                 } else {
96                         for (j = 0; j < nsbi; j++) {
97                                 for (k = 0; k < 4; k++)
98                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
99                                                 goto found_it;
100                         }
101                         goto out_unlock;
102                 }
103 found_it:       seq_printf(p, "%3d: ", i);
104 #ifndef CONFIG_SMP
105                 seq_printf(p, "%10u ", kstat_irqs(i));
106 #else
107                 for_each_online_cpu(x)
108                         seq_printf(p, "%10u ",
109                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
110 #endif
111                 seq_printf(p, "%c %s",
112                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
113                         action->name);
114                 action = action->next;
115                 for (;;) {
116                         for (; action; action = action->next) {
117                                 seq_printf(p, ",%s %s",
118                                         (action->flags & IRQF_DISABLED) ? " +" : "",
119                                         action->name);
120                         }
121                         if (!sbusl) break;
122                         k++;
123                         if (k < 4)
124                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
125                         else {
126                                 j++;
127                                 if (j == nsbi) break;
128                                 k = 0;
129                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
130                         }
131                 }
132                 seq_putc(p, '\n');
133         }
134 out_unlock:
135         spin_unlock_irqrestore(&irq_action_lock, flags);
136         return 0;
137 }
138
139 void sun4d_free_irq(unsigned int irq, void *dev_id)
140 {
141         struct irqaction *action, **actionp;
142         struct irqaction *tmp = NULL;
143         unsigned long flags;
144
145         spin_lock_irqsave(&irq_action_lock, flags);
146         if (irq < 15)
147                 actionp = irq + irq_action;
148         else
149                 actionp = &(sbus_actions[irq - (1 << 5)].action);
150         action = *actionp;
151         if (!action) {
152                 printk("Trying to free free IRQ%d\n",irq);
153                 goto out_unlock;
154         }
155         if (dev_id) {
156                 for (; action; action = action->next) {
157                         if (action->dev_id == dev_id)
158                                 break;
159                         tmp = action;
160                 }
161                 if (!action) {
162                         printk("Trying to free free shared IRQ%d\n",irq);
163                         goto out_unlock;
164                 }
165         } else if (action->flags & IRQF_SHARED) {
166                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
167                 goto out_unlock;
168         }
169         if (action->flags & SA_STATIC_ALLOC)
170         {
171                 /* This interrupt is marked as specially allocated
172                  * so it is a bad idea to free it.
173                  */
174                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
175                        irq, action->name);
176                 goto out_unlock;
177         }
178         
179         if (action && tmp)
180                 tmp->next = action->next;
181         else
182                 *actionp = action->next;
183
184         spin_unlock_irqrestore(&irq_action_lock, flags);
185
186         synchronize_irq(irq);
187
188         spin_lock_irqsave(&irq_action_lock, flags);
189
190         kfree(action);
191
192         if (!(*actionp))
193                 __disable_irq(irq);
194
195 out_unlock:
196         spin_unlock_irqrestore(&irq_action_lock, flags);
197 }
198
199 extern void unexpected_irq(int, void *, struct pt_regs *);
200
201 void sun4d_handler_irq(int irq, struct pt_regs * regs)
202 {
203         struct pt_regs *old_regs;
204         struct irqaction * action;
205         int cpu = smp_processor_id();
206         /* SBUS IRQ level (1 - 7) */
207         int sbusl = pil_to_sbus[irq];
208         
209         /* FIXME: Is this necessary?? */
210         cc_get_ipen();
211         
212         cc_set_iclr(1 << irq);
213         
214         old_regs = set_irq_regs(regs);
215         irq_enter();
216         kstat_cpu(cpu).irqs[irq]++;
217         if (!sbusl) {
218                 action = *(irq + irq_action);
219                 if (!action)
220                         unexpected_irq(irq, NULL, regs);
221                 do {
222                         action->handler(irq, action->dev_id);
223                         action = action->next;
224                 } while (action);
225         } else {
226                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
227                 int sbino;
228                 struct sbus_action *actionp;
229                 unsigned mask, slot;
230                 int sbil = (sbusl << 2);
231                 
232                 bw_clear_intr_mask(sbusl, bus_mask);
233                 
234                 /* Loop for each pending SBI */
235                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
236                         if (bus_mask & 1) {
237                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
238                                 mask &= (0xf << sbil);
239                                 actionp = sbus_actions + (sbino << 5) + (sbil);
240                                 /* Loop for each pending SBI slot */
241                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
242                                         if (mask & slot) {
243                                                 mask &= ~slot;
244                                                 action = actionp->action;
245                                                 
246                                                 if (!action)
247                                                         unexpected_irq(irq, NULL, regs);
248                                                 do {
249                                                         action->handler(irq, action->dev_id);
250                                                         action = action->next;
251                                                 } while (action);
252                                                 release_sbi(SBI2DEVID(sbino), slot);
253                                         }
254                         }
255         }
256         irq_exit();
257         set_irq_regs(old_regs);
258 }
259
260 int sun4d_request_irq(unsigned int irq,
261                 irq_handler_t handler,
262                 unsigned long irqflags, const char * devname, void *dev_id)
263 {
264         struct irqaction *action, *tmp = NULL, **actionp;
265         unsigned long flags;
266         int ret;
267         
268         if(irq > 14 && irq < (1 << 5)) {
269                 ret = -EINVAL;
270                 goto out;
271         }
272
273         if (!handler) {
274                 ret = -EINVAL;
275                 goto out;
276         }
277
278         spin_lock_irqsave(&irq_action_lock, flags);
279
280         if (irq >= (1 << 5))
281                 actionp = &(sbus_actions[irq - (1 << 5)].action);
282         else
283                 actionp = irq + irq_action;
284         action = *actionp;
285         
286         if (action) {
287                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
288                         for (tmp = action; tmp->next; tmp = tmp->next);
289                 } else {
290                         ret = -EBUSY;
291                         goto out_unlock;
292                 }
293                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
294                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
295                         ret = -EBUSY;
296                         goto out_unlock;
297                 }
298                 action = NULL;          /* Or else! */
299         }
300
301         /* If this is flagged as statically allocated then we use our
302          * private struct which is never freed.
303          */
304         if (irqflags & SA_STATIC_ALLOC) {
305                 if (static_irq_count < MAX_STATIC_ALLOC)
306                         action = &static_irqaction[static_irq_count++];
307                 else
308                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
309         }
310         
311         if (action == NULL)
312                 action = kmalloc(sizeof(struct irqaction),
313                                                      GFP_ATOMIC);
314         
315         if (!action) { 
316                 ret = -ENOMEM;
317                 goto out_unlock;
318         }
319
320         action->handler = handler;
321         action->flags = irqflags;
322         cpus_clear(action->mask);
323         action->name = devname;
324         action->next = NULL;
325         action->dev_id = dev_id;
326
327         if (tmp)
328                 tmp->next = action;
329         else
330                 *actionp = action;
331                 
332         __enable_irq(irq);
333
334         ret = 0;
335 out_unlock:
336         spin_unlock_irqrestore(&irq_action_lock, flags);
337 out:
338         return ret;
339 }
340
341 static void sun4d_disable_irq(unsigned int irq)
342 {
343 #ifdef CONFIG_SMP
344         int tid = sbus_tid[(irq >> 5) - 1];
345         unsigned long flags;
346 #endif  
347         
348         if (irq < NR_IRQS) return;
349 #ifdef CONFIG_SMP
350         spin_lock_irqsave(&sun4d_imsk_lock, flags);
351         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
352         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
353 #else           
354         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
355 #endif
356 }
357
358 static void sun4d_enable_irq(unsigned int irq)
359 {
360 #ifdef CONFIG_SMP
361         int tid = sbus_tid[(irq >> 5) - 1];
362         unsigned long flags;
363 #endif  
364         
365         if (irq < NR_IRQS) return;
366 #ifdef CONFIG_SMP
367         spin_lock_irqsave(&sun4d_imsk_lock, flags);
368         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
369         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
370 #else           
371         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
372 #endif
373 }
374
375 #ifdef CONFIG_SMP
376 static void sun4d_set_cpu_int(int cpu, int level)
377 {
378         sun4d_send_ipi(cpu, level);
379 }
380
381 static void sun4d_clear_ipi(int cpu, int level)
382 {
383 }
384
385 static void sun4d_set_udt(int cpu)
386 {
387 }
388
389 /* Setup IRQ distribution scheme. */
390 void __init sun4d_distribute_irqs(void)
391 {
392         struct device_node *dp;
393
394 #ifdef DISTRIBUTE_IRQS
395         cpumask_t sbus_serving_map;
396
397         sbus_serving_map = cpu_present_map;
398         for_each_node_by_name(dp, "sbi") {
399                 int board = of_getintprop_default(dp, "board#", 0);
400
401                 if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
402                         sbus_tid[board] = (board * 2 + 1);
403                 else if (cpu_isset(board * 2, cpu_present_map))
404                         sbus_tid[board] = (board * 2);
405                 else if (cpu_isset(board * 2 + 1, cpu_present_map))
406                         sbus_tid[board] = (board * 2 + 1);
407                 else
408                         sbus_tid[board] = 0xff;
409                 if (sbus_tid[board] != 0xff)
410                         cpu_clear(sbus_tid[board], sbus_serving_map);
411         }
412         for_each_node_by_name(dp, "sbi") {
413                 int board = of_getintprop_default(dp, "board#", 0);
414                 if (sbus_tid[board] == 0xff) {
415                         int i = 31;
416                                 
417                         if (cpus_empty(sbus_serving_map))
418                                 sbus_serving_map = cpu_present_map;
419                         while (cpu_isset(i, sbus_serving_map))
420                                 i--;
421                         sbus_tid[board] = i;
422                         cpu_clear(i, sbus_serving_map);
423                 }
424         }
425         for_each_node_by_name(dp, "sbi") {
426                 int devid = of_getintprop_default(dp, "device-id", 0);
427                 int board = of_getintprop_default(dp, "board#", 0);
428                 printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
429                 set_sbi_tid(devid, sbus_tid[board] << 3);
430         }
431 #else
432         int cpuid = cpu_logical_map(1);
433
434         if (cpuid == -1)
435                 cpuid = cpu_logical_map(0);
436         for_each_node_by_name(dp, "sbi") {
437                 int devid = of_getintprop_default(dp, "device-id", 0);
438                 int board = of_getintprop_default(dp, "board#", 0);
439                 sbus_tid[board] = cpuid;
440                 set_sbi_tid(devid, cpuid << 3);
441         }
442         printk("All sbus IRQs directed to CPU%d\n", cpuid);
443 #endif
444 }
445 #endif
446  
447 static void sun4d_clear_clock_irq(void)
448 {
449         volatile unsigned int clear_intr;
450         clear_intr = sun4d_timers->l10_timer_limit;
451 }
452
453 static void sun4d_clear_profile_irq(int cpu)
454 {
455         bw_get_prof_limit(cpu);
456 }
457
458 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
459 {
460         bw_set_prof_limit(cpu, limit);
461 }
462
463 static void __init sun4d_init_timers(irq_handler_t counter_fn)
464 {
465         int irq;
466         int cpu;
467         struct resource r;
468         int mid;
469
470         /* Map the User Timer registers. */
471         memset(&r, 0, sizeof(r));
472 #ifdef CONFIG_SMP
473         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
474 #else
475         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
476 #endif
477         r.flags = 0xf;
478         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
479             PAGE_SIZE, "user timer");
480
481         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
482         master_l10_counter = &sun4d_timers->l10_cur_count;
483         master_l10_limit = &sun4d_timers->l10_timer_limit;
484
485         irq = request_irq(TIMER_IRQ,
486                           counter_fn,
487                           (IRQF_DISABLED | SA_STATIC_ALLOC),
488                           "timer", NULL);
489         if (irq) {
490                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
491                 prom_halt();
492         }
493         
494         /* Enable user timer free run for CPU 0 in BW */
495         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
496
497         cpu = 0;
498         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
499                 sun4d_load_profile_irq(mid >> 3, 0);
500                 cpu++;
501         }
502                 
503 #ifdef CONFIG_SMP
504         {
505                 unsigned long flags;
506                 extern unsigned long lvl14_save[4];
507                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
508                 extern unsigned int real_irq_entry[], smp4d_ticker[];
509                 extern unsigned int patchme_maybe_smp_msg[];
510
511                 /* Adjust so that we jump directly to smp4d_ticker */
512                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
513
514                 /* For SMP we use the level 14 ticker, however the bootup code
515                  * has copied the firmware's level 14 vector into the boot cpu's
516                  * trap table, we must fix this now or we get squashed.
517                  */
518                 local_irq_save(flags);
519                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
520                 trap_table->inst_one = lvl14_save[0];
521                 trap_table->inst_two = lvl14_save[1];
522                 trap_table->inst_three = lvl14_save[2];
523                 trap_table->inst_four = lvl14_save[3];
524                 local_flush_cache_all();
525                 local_irq_restore(flags);
526         }
527 #endif
528 }
529
530 void __init sun4d_init_sbi_irq(void)
531 {
532         struct device_node *dp;
533
534         nsbi = 0;
535         for_each_node_by_name(dp, "sbi")
536                 nsbi++;
537         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
538         if (!sbus_actions) {
539                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
540                 prom_halt();
541         }
542         for_each_node_by_name(dp, "sbi") {
543                 int devid = of_getintprop_default(dp, "device-id", 0);
544                 int board = of_getintprop_default(dp, "board#", 0);
545                 unsigned int mask;
546
547 #ifdef CONFIG_SMP       
548                 {
549                         extern unsigned char boot_cpu_id;
550                 
551                         set_sbi_tid(devid, boot_cpu_id << 3);
552                         sbus_tid[board] = boot_cpu_id;
553                 }
554 #endif
555                 /* Get rid of pending irqs from PROM */
556                 mask = acquire_sbi(devid, 0xffffffff);
557                 if (mask) {
558                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
559                         release_sbi(devid, mask);
560                 }
561         }
562 }
563
564 void __init sun4d_init_IRQ(void)
565 {
566         local_irq_disable();
567
568         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
569         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
570         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
571         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
572         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
573         sparc_init_timers = sun4d_init_timers;
574 #ifdef CONFIG_SMP
575         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
576         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
577         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
578 #endif
579         /* Cannot enable interrupts until OBP ticker is disabled. */
580 }