xref: /openbmc/linux/arch/sparc/kernel/sun4d_irq.c (revision 732a675a)
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 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 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 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
261 {
262 	int sbusl = pil_to_sbus[irq];
263 
264 	if (sbusl)
265 		return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
266 	else
267 		return irq;
268 }
269 
270 unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
271 {
272 	if (sbint >= sizeof(sbus_to_pil)) {
273 		printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
274 		BUG();
275 	}
276 	return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
277 }
278 
279 int sun4d_request_irq(unsigned int irq,
280 		irq_handler_t handler,
281 		unsigned long irqflags, const char * devname, void *dev_id)
282 {
283 	struct irqaction *action, *tmp = NULL, **actionp;
284 	unsigned long flags;
285 	int ret;
286 
287 	if(irq > 14 && irq < (1 << 5)) {
288 		ret = -EINVAL;
289 		goto out;
290 	}
291 
292 	if (!handler) {
293 		ret = -EINVAL;
294 		goto out;
295 	}
296 
297 	spin_lock_irqsave(&irq_action_lock, flags);
298 
299 	if (irq >= (1 << 5))
300 		actionp = &(sbus_actions[irq - (1 << 5)].action);
301 	else
302 		actionp = irq + irq_action;
303 	action = *actionp;
304 
305 	if (action) {
306 		if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
307 			for (tmp = action; tmp->next; tmp = tmp->next);
308 		} else {
309 			ret = -EBUSY;
310 			goto out_unlock;
311 		}
312 		if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
313 			printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
314 			ret = -EBUSY;
315 			goto out_unlock;
316 		}
317 		action = NULL;		/* Or else! */
318 	}
319 
320 	/* If this is flagged as statically allocated then we use our
321 	 * private struct which is never freed.
322 	 */
323 	if (irqflags & SA_STATIC_ALLOC) {
324 		if (static_irq_count < MAX_STATIC_ALLOC)
325 			action = &static_irqaction[static_irq_count++];
326 		else
327 			printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
328 	}
329 
330 	if (action == NULL)
331 		action = kmalloc(sizeof(struct irqaction),
332 						     GFP_ATOMIC);
333 
334 	if (!action) {
335 		ret = -ENOMEM;
336 		goto out_unlock;
337 	}
338 
339 	action->handler = handler;
340 	action->flags = irqflags;
341 	cpus_clear(action->mask);
342 	action->name = devname;
343 	action->next = NULL;
344 	action->dev_id = dev_id;
345 
346 	if (tmp)
347 		tmp->next = action;
348 	else
349 		*actionp = action;
350 
351 	__enable_irq(irq);
352 
353 	ret = 0;
354 out_unlock:
355 	spin_unlock_irqrestore(&irq_action_lock, flags);
356 out:
357 	return ret;
358 }
359 
360 static void sun4d_disable_irq(unsigned int irq)
361 {
362 #ifdef CONFIG_SMP
363 	int tid = sbus_tid[(irq >> 5) - 1];
364 	unsigned long flags;
365 #endif
366 
367 	if (irq < NR_IRQS) return;
368 #ifdef CONFIG_SMP
369 	spin_lock_irqsave(&sun4d_imsk_lock, flags);
370 	cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
371 	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
372 #else
373 	cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
374 #endif
375 }
376 
377 static void sun4d_enable_irq(unsigned int irq)
378 {
379 #ifdef CONFIG_SMP
380 	int tid = sbus_tid[(irq >> 5) - 1];
381 	unsigned long flags;
382 #endif
383 
384 	if (irq < NR_IRQS) return;
385 #ifdef CONFIG_SMP
386 	spin_lock_irqsave(&sun4d_imsk_lock, flags);
387 	cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
388 	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
389 #else
390 	cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
391 #endif
392 }
393 
394 #ifdef CONFIG_SMP
395 static void sun4d_set_cpu_int(int cpu, int level)
396 {
397 	sun4d_send_ipi(cpu, level);
398 }
399 
400 static void sun4d_clear_ipi(int cpu, int level)
401 {
402 }
403 
404 static void sun4d_set_udt(int cpu)
405 {
406 }
407 
408 /* Setup IRQ distribution scheme. */
409 void __init sun4d_distribute_irqs(void)
410 {
411 #ifdef DISTRIBUTE_IRQS
412 	struct sbus_bus *sbus;
413 	unsigned long sbus_serving_map;
414 
415 	sbus_serving_map = cpu_present_map;
416 	for_each_sbus(sbus) {
417 		if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
418 			sbus_tid[sbus->board] = (sbus->board * 2 + 1);
419 		else if (cpu_present_map & (1 << (sbus->board * 2)))
420 			sbus_tid[sbus->board] = (sbus->board * 2);
421 		else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
422 			sbus_tid[sbus->board] = (sbus->board * 2 + 1);
423 		else
424 			sbus_tid[sbus->board] = 0xff;
425 		if (sbus_tid[sbus->board] != 0xff)
426 			sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
427 	}
428 	for_each_sbus(sbus)
429 		if (sbus_tid[sbus->board] == 0xff) {
430 			int i = 31;
431 
432 			if (!sbus_serving_map)
433 				sbus_serving_map = cpu_present_map;
434 			while (!(sbus_serving_map & (1 << i)))
435 				i--;
436 			sbus_tid[sbus->board] = i;
437 			sbus_serving_map &= ~(1 << i);
438 		}
439 	for_each_sbus(sbus) {
440 		printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
441 		set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
442 	}
443 #else
444 	struct sbus_bus *sbus;
445 	int cpuid = cpu_logical_map(1);
446 
447 	if (cpuid == -1)
448 		cpuid = cpu_logical_map(0);
449 	for_each_sbus(sbus) {
450 		sbus_tid[sbus->board] = cpuid;
451 		set_sbi_tid(sbus->devid, cpuid << 3);
452 	}
453 	printk("All sbus IRQs directed to CPU%d\n", cpuid);
454 #endif
455 }
456 #endif
457 
458 static void sun4d_clear_clock_irq(void)
459 {
460 	volatile unsigned int clear_intr;
461 	clear_intr = sun4d_timers->l10_timer_limit;
462 }
463 
464 static void sun4d_clear_profile_irq(int cpu)
465 {
466 	bw_get_prof_limit(cpu);
467 }
468 
469 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
470 {
471 	bw_set_prof_limit(cpu, limit);
472 }
473 
474 static void __init sun4d_init_timers(irq_handler_t counter_fn)
475 {
476 	int irq;
477 	int cpu;
478 	struct resource r;
479 	int mid;
480 
481 	/* Map the User Timer registers. */
482 	memset(&r, 0, sizeof(r));
483 #ifdef CONFIG_SMP
484 	r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
485 #else
486 	r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
487 #endif
488 	r.flags = 0xf;
489 	sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
490 	    PAGE_SIZE, "user timer");
491 
492 	sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
493 	master_l10_counter = &sun4d_timers->l10_cur_count;
494 	master_l10_limit = &sun4d_timers->l10_timer_limit;
495 
496 	irq = request_irq(TIMER_IRQ,
497 			  counter_fn,
498 			  (IRQF_DISABLED | SA_STATIC_ALLOC),
499 			  "timer", NULL);
500 	if (irq) {
501 		prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
502 		prom_halt();
503 	}
504 
505 	/* Enable user timer free run for CPU 0 in BW */
506 	/* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
507 
508 	cpu = 0;
509 	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
510 		sun4d_load_profile_irq(mid >> 3, 0);
511 		cpu++;
512 	}
513 
514 #ifdef CONFIG_SMP
515 	{
516 		unsigned long flags;
517 		extern unsigned long lvl14_save[4];
518 		struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
519 		extern unsigned int real_irq_entry[], smp4d_ticker[];
520 		extern unsigned int patchme_maybe_smp_msg[];
521 
522 		/* Adjust so that we jump directly to smp4d_ticker */
523 		lvl14_save[2] += smp4d_ticker - real_irq_entry;
524 
525 		/* For SMP we use the level 14 ticker, however the bootup code
526 		 * has copied the firmware's level 14 vector into the boot cpu's
527 		 * trap table, we must fix this now or we get squashed.
528 		 */
529 		local_irq_save(flags);
530 		patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
531 		trap_table->inst_one = lvl14_save[0];
532 		trap_table->inst_two = lvl14_save[1];
533 		trap_table->inst_three = lvl14_save[2];
534 		trap_table->inst_four = lvl14_save[3];
535 		local_flush_cache_all();
536 		local_irq_restore(flags);
537 	}
538 #endif
539 }
540 
541 void __init sun4d_init_sbi_irq(void)
542 {
543 	struct sbus_bus *sbus;
544 	unsigned mask;
545 
546 	nsbi = 0;
547 	for_each_sbus(sbus)
548 		nsbi++;
549 	sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
550 	if (!sbus_actions) {
551 		prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
552 		prom_halt();
553 	}
554 	for_each_sbus(sbus) {
555 #ifdef CONFIG_SMP
556 		extern unsigned char boot_cpu_id;
557 
558 		set_sbi_tid(sbus->devid, boot_cpu_id << 3);
559 		sbus_tid[sbus->board] = boot_cpu_id;
560 #endif
561 		/* Get rid of pending irqs from PROM */
562 		mask = acquire_sbi(sbus->devid, 0xffffffff);
563 		if (mask) {
564 			printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
565 			release_sbi(sbus->devid, mask);
566 		}
567 	}
568 }
569 
570 void __init sun4d_init_IRQ(void)
571 {
572 	local_irq_disable();
573 
574 	BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
575 	BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
576 	BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
577 	BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
578 	BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
579 	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
580 	sparc_init_timers = sun4d_init_timers;
581 #ifdef CONFIG_SMP
582 	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
583 	BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
584 	BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
585 #endif
586 	/* Cannot enable interrupts until OBP ticker is disabled. */
587 }
588