summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/sun4d_irq.c
blob: 77b4a89927100fe51be857b6a47d4fead6a8e135 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
/*
 * SS1000/SC2000 interrupt handling.
 *
 *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *  Heavily based on arch/sparc/kernel/irq.c.
 */

#include <linux/kernel_stat.h>
#include <linux/seq_file.h>

#include <asm/timer.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/sbi.h>
#include <asm/cacheflush.h>

#include "kernel.h"
#include "irq.h"

/* Sun4d interrupts fall roughly into two categories.  SBUS and
 * cpu local.  CPU local interrupts cover the timer interrupts
 * and whatnot, and we encode those as normal PILs between
 * 0 and 15.
 *
 * SBUS interrupts are encoded integers including the board number
 * (plus one), the SBUS level, and the SBUS slot number.  Sun4D
 * IRQ dispatch is done by:
 *
 * 1) Reading the BW local interrupt table in order to get the bus
 *    interrupt mask.
 *
 *    This table is indexed by SBUS interrupt level which can be
 *    derived from the PIL we got interrupted on.
 *
 * 2) For each bus showing interrupt pending from #1, read the
 *    SBI interrupt state register.  This will indicate which slots
 *    have interrupts pending for that SBUS interrupt level.
 */

struct sun4d_timer_regs {
	u32	l10_timer_limit;
	u32	l10_cur_countx;
	u32	l10_limit_noclear;
	u32	ctrl;
	u32	l10_cur_count;
};

static struct sun4d_timer_regs __iomem *sun4d_timers;

#define TIMER_IRQ	10

#define MAX_STATIC_ALLOC	4
static unsigned char sbus_tid[32];

static struct irqaction *irq_action[NR_IRQS];

static struct sbus_action {
	struct irqaction *action;
	/* For SMP this needs to be extended */
} *sbus_actions;

static int pil_to_sbus[] = {
	0,
	0,
	1,
	2,
	0,
	3,
	0,
	4,
	0,
	5,
	0,
	6,
	0,
	7,
	0,
	0,
};

static int sbus_to_pil[] = {
	0,
	2,
	3,
	5,
	7,
	9,
	11,
	13,
};

static int nsbi;

/* Exported for sun4d_smp.c */
DEFINE_SPINLOCK(sun4d_imsk_lock);

int show_sun4d_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *) v, j = 0, k = 0, sbusl;
	struct irqaction *action;
	unsigned long flags;
#ifdef CONFIG_SMP
	int x;
#endif

	spin_lock_irqsave(&irq_action_lock, flags);
	if (i < NR_IRQS) {
		sbusl = pil_to_sbus[i];
		if (!sbusl) {
			action = *(i + irq_action);
			if (!action)
				goto out_unlock;
		} else {
			for (j = 0; j < nsbi; j++) {
				for (k = 0; k < 4; k++)
					action = sbus_actions[(j << 5) + (sbusl << 2) + k].action;
					if (action)
						goto found_it;
			}
			goto out_unlock;
		}
found_it:	seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
		for_each_online_cpu(x)
			seq_printf(p, "%10u ",
			       kstat_cpu(cpu_logical_map(x)).irqs[i]);
#endif
		seq_printf(p, "%c %s",
			(action->flags & IRQF_DISABLED) ? '+' : ' ',
			action->name);
		action = action->next;
		for (;;) {
			for (; action; action = action->next) {
				seq_printf(p, ",%s %s",
					(action->flags & IRQF_DISABLED) ? " +" : "",
					action->name);
			}
			if (!sbusl)
				break;
			k++;
			if (k < 4) {
				action = sbus_actions[(j << 5) + (sbusl << 2) + k].action;
			} else {
				j++;
				if (j == nsbi)
					break;
				k = 0;
				action = sbus_actions[(j << 5) + (sbusl << 2)].action;
			}
		}
		seq_putc(p, '\n');
	}
out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
	return 0;
}

void sun4d_free_irq(unsigned int irq, void *dev_id)
{
	struct irqaction *action, **actionp;
	struct irqaction *tmp = NULL;
	unsigned long flags;

	spin_lock_irqsave(&irq_action_lock, flags);
	if (irq < 15)
		actionp = irq + irq_action;
	else
		actionp = &(sbus_actions[irq - (1 << 5)].action);
	action = *actionp;
	if (!action) {
		printk(KERN_ERR "Trying to free free IRQ%d\n", irq);
		goto out_unlock;
	}
	if (dev_id) {
		for (; action; action = action->next) {
			if (action->dev_id == dev_id)
				break;
			tmp = action;
		}
		if (!action) {
			printk(KERN_ERR "Trying to free free shared IRQ%d\n",
			       irq);
			goto out_unlock;
		}
	} else if (action->flags & IRQF_SHARED) {
		printk(KERN_ERR "Trying to free shared IRQ%d with NULL device ID\n",
		       irq);
		goto out_unlock;
	}
	if (action->flags & SA_STATIC_ALLOC) {
		/*
		 * This interrupt is marked as specially allocated
		 * so it is a bad idea to free it.
		 */
		printk(KERN_ERR "Attempt to free statically allocated IRQ%d (%s)\n",
		       irq, action->name);
		goto out_unlock;
	}

	if (tmp)
		tmp->next = action->next;
	else
		*actionp = action->next;

	spin_unlock_irqrestore(&irq_action_lock, flags);

	synchronize_irq(irq);

	spin_lock_irqsave(&irq_action_lock, flags);

	kfree(action);

	if (!(*actionp))
		__disable_irq(irq);

out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
}

void sun4d_handler_irq(int pil, struct pt_regs *regs)
{
	struct pt_regs *old_regs;
	struct irqaction *action;
	int cpu = smp_processor_id();
	/* SBUS IRQ level (1 - 7) */
	int sbusl = pil_to_sbus[pil];

	/* FIXME: Is this necessary?? */
	cc_get_ipen();

	cc_set_iclr(1 << pil);

	old_regs = set_irq_regs(regs);
	irq_enter();
	kstat_cpu(cpu).irqs[pil]++;
	if (!sbusl) {
		action = *(pil + irq_action);
		if (!action)
			unexpected_irq(pil, NULL, regs);
		do {
			action->handler(pil, action->dev_id);
			action = action->next;
		} while (action);
	} else {
		int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
		int sbino;
		struct sbus_action *actionp;
		unsigned mask, slot;
		int sbil = (sbusl << 2);

		bw_clear_intr_mask(sbusl, bus_mask);

		/* Loop for each pending SBI */
		for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
			if (bus_mask & 1) {
				mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
				mask &= (0xf << sbil);
				actionp = sbus_actions + (sbino << 5) + (sbil);
				/* Loop for each pending SBI slot */
				for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
					if (mask & slot) {
						mask &= ~slot;
						action = actionp->action;

						if (!action)
							unexpected_irq(pil, NULL, regs);
						do {
							action->handler(pil, action->dev_id);
							action = action->next;
						} while (action);
						release_sbi(SBI2DEVID(sbino), slot);
					}
			}
	}
	irq_exit();
	set_irq_regs(old_regs);
}

int sun4d_request_irq(unsigned int irq,
		irq_handler_t handler,
		unsigned long irqflags, const char *devname, void *dev_id)
{
	struct irqaction *action, *tmp = NULL, **actionp;
	unsigned long flags;
	int ret;

	if (irq > 14 && irq < (1 << 5)) {
		ret = -EINVAL;
		goto out;
	}

	if (!handler) {
		ret = -EINVAL;
		goto out;
	}

	spin_lock_irqsave(&irq_action_lock, flags);

	if (irq >= (1 << 5))
		actionp = &(sbus_actions[irq - (1 << 5)].action);
	else
		actionp = irq + irq_action;
	action = *actionp;

	if (action) {
		if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
			for (tmp = action; tmp->next; tmp = tmp->next)
				/* find last entry - tmp used below */;
		} else {
			ret = -EBUSY;
			goto out_unlock;
		}
		if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
			printk(KERN_ERR "Attempt to mix fast and slow interrupts on IRQ%d denied\n",
			       irq);
			ret = -EBUSY;
			goto out_unlock;
		}
		action = NULL;		/* Or else! */
	}

	/* If this is flagged as statically allocated then we use our
	 * private struct which is never freed.
	 */
	if (irqflags & SA_STATIC_ALLOC) {
		if (static_irq_count < MAX_STATIC_ALLOC)
			action = &static_irqaction[static_irq_count++];
		else
			printk(KERN_ERR "Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
			       irq, devname);
	}

	if (action == NULL)
		action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);

	if (!action) {
		ret = -ENOMEM;
		goto out_unlock;
	}

	action->handler = handler;
	action->flags = irqflags;
	action->name = devname;
	action->next = NULL;
	action->dev_id = dev_id;

	if (tmp)
		tmp->next = action;
	else
		*actionp = action;

	__enable_irq(irq);

	ret = 0;
out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
out:
	return ret;
}

static void sun4d_disable_irq(unsigned int irq)
{
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;

	if (irq < NR_IRQS)
		return;

	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
}

static void sun4d_enable_irq(unsigned int irq)
{
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;

	if (irq < NR_IRQS)
		return;

	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
}

#ifdef CONFIG_SMP
static void sun4d_set_cpu_int(int cpu, int level)
{
	sun4d_send_ipi(cpu, level);
}

static void sun4d_clear_ipi(int cpu, int level)
{
}

static void sun4d_set_udt(int cpu)
{
}

/* Setup IRQ distribution scheme. */
void __init sun4d_distribute_irqs(void)
{
	struct device_node *dp;

	int cpuid = cpu_logical_map(1);

	if (cpuid == -1)
		cpuid = cpu_logical_map(0);
	for_each_node_by_name(dp, "sbi") {
		int devid = of_getintprop_default(dp, "device-id", 0);
		int board = of_getintprop_default(dp, "board#", 0);
		sbus_tid[board] = cpuid;
		set_sbi_tid(devid, cpuid << 3);
	}
	printk(KERN_ERR "All sbus IRQs directed to CPU%d\n", cpuid);
}
#endif

static void sun4d_clear_clock_irq(void)
{
	sbus_readl(&sun4d_timers->l10_timer_limit);
}

static void sun4d_load_profile_irq(int cpu, unsigned int limit)
{
	bw_set_prof_limit(cpu, limit);
}

static void __init sun4d_load_profile_irqs(void)
{
	int cpu = 0, mid;

	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
		sun4d_load_profile_irq(mid >> 3, 0);
		cpu++;
	}
}

unsigned int sun4d_build_device_irq(struct platform_device *op,
                                    unsigned int real_irq)
{
	static int pil_to_sbus[] = {
		0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
	};
	struct device_node *dp = op->dev.of_node;
	struct device_node *io_unit, *sbi = dp->parent;
	const struct linux_prom_registers *regs;
	int board, slot;
	int sbusl;

	while (sbi) {
		if (!strcmp(sbi->name, "sbi"))
			break;

		sbi = sbi->parent;
	}
	if (!sbi)
		goto err_out;

	regs = of_get_property(dp, "reg", NULL);
	if (!regs)
		goto err_out;

	slot = regs->which_io;

	/*
	 *  If SBI's parent is not io-unit or the io-unit lacks
	 * a "board#" property, something is very wrong.
	 */
	if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
		printk("%s: Error, parent is not io-unit.\n", sbi->full_name);
		goto err_out;
	}
	io_unit = sbi->parent;
	board = of_getintprop_default(io_unit, "board#", -1);
	if (board == -1) {
		printk("%s: Error, lacks board# property.\n", io_unit->full_name);
		goto err_out;
	}

	sbusl = pil_to_sbus[real_irq];
	if (sbusl)
		return (((board + 1) << 5) + (sbusl << 2) + slot);

err_out:
	return real_irq;
}

static void __init sun4d_fixup_trap_table(void)
{
#ifdef CONFIG_SMP
	unsigned long flags;
	struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];

	/* Adjust so that we jump directly to smp4d_ticker */
	lvl14_save[2] += smp4d_ticker - real_irq_entry;

	/* For SMP we use the level 14 ticker, however the bootup code
	 * has copied the firmware's level 14 vector into the boot cpu's
	 * trap table, we must fix this now or we get squashed.
	 */
	local_irq_save(flags);
	patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
	trap_table->inst_one = lvl14_save[0];
	trap_table->inst_two = lvl14_save[1];
	trap_table->inst_three = lvl14_save[2];
	trap_table->inst_four = lvl14_save[3];
	local_flush_cache_all();
	local_irq_restore(flags);
#endif
}

static void __init sun4d_init_timers(irq_handler_t counter_fn)
{
	struct device_node *dp;
	struct resource res;
	const u32 *reg;
	int err;

	dp = of_find_node_by_name(NULL, "cpu-unit");
	if (!dp) {
		prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
		prom_halt();
	}

	/* Which cpu-unit we use is arbitrary, we can view the bootbus timer
	 * registers via any cpu's mapping.  The first 'reg' property is the
	 * bootbus.
	 */
	reg = of_get_property(dp, "reg", NULL);
	of_node_put(dp);
	if (!reg) {
		prom_printf("sun4d_init_timers: No reg property\n");
		prom_halt();
	}

	res.start = reg[1];
	res.end = reg[2] - 1;
	res.flags = reg[0] & 0xff;
	sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
				  sizeof(struct sun4d_timer_regs), "user timer");
	if (!sun4d_timers) {
		prom_printf("sun4d_init_timers: Can't map timer regs\n");
		prom_halt();
	}

	sbus_writel((((1000000/HZ) + 1) << 10), &sun4d_timers->l10_timer_limit);

	master_l10_counter = &sun4d_timers->l10_cur_count;

	err = request_irq(TIMER_IRQ, counter_fn,
			  (IRQF_DISABLED | SA_STATIC_ALLOC),
			  "timer", NULL);
	if (err) {
		prom_printf("sun4d_init_timers: request_irq() failed with %d\n",
		             err);
		prom_halt();
	}
	sun4d_load_profile_irqs();
	sun4d_fixup_trap_table();
}

void __init sun4d_init_sbi_irq(void)
{
	struct device_node *dp;
	int target_cpu = 0;

#ifdef CONFIG_SMP
	target_cpu = boot_cpu_id;
#endif

	nsbi = 0;
	for_each_node_by_name(dp, "sbi")
		nsbi++;
	sbus_actions = kzalloc(nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
	if (!sbus_actions) {
		prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
		prom_halt();
	}
	for_each_node_by_name(dp, "sbi") {
		int devid = of_getintprop_default(dp, "device-id", 0);
		int board = of_getintprop_default(dp, "board#", 0);
		unsigned int mask;

		set_sbi_tid(devid, target_cpu << 3);
		sbus_tid[board] = target_cpu;

		/* Get rid of pending irqs from PROM */
		mask = acquire_sbi(devid, 0xffffffff);
		if (mask) {
			printk(KERN_ERR "Clearing pending IRQs %08x on SBI %d\n",
			       mask, board);
			release_sbi(devid, mask);
		}
	}
}

void __init sun4d_init_IRQ(void)
{
	local_irq_disable();

	BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);

	sparc_irq_config.init_timers = sun4d_init_timers;
	sparc_irq_config.build_device_irq = sun4d_build_device_irq;

#ifdef CONFIG_SMP
	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
	BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
#endif
	/* Cannot enable interrupts until OBP ticker is disabled. */
}