summaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/sun4m_irq.c
blob: afdac7ff174aea33edee5850104c5865449efda9 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * sun4m irq support
 *
 *  djhr: Hacked out of irq.c into a CPU dependent version.
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
 *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
 */

#include <linux/slab.h>
#include <linux/sched/debug.h>

#include <asm/timer.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <linux/pgtable.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

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

/* Sample sun4m IRQ layout:
 *
 * 0x22 - Power
 * 0x24 - ESP SCSI
 * 0x26 - Lance ethernet
 * 0x2b - Floppy
 * 0x2c - Zilog uart
 * 0x32 - SBUS level 0
 * 0x33 - Parallel port, SBUS level 1
 * 0x35 - SBUS level 2
 * 0x37 - SBUS level 3
 * 0x39 - Audio, Graphics card, SBUS level 4
 * 0x3b - SBUS level 5
 * 0x3d - SBUS level 6
 *
 * Each interrupt source has a mask bit in the interrupt registers.
 * When the mask bit is set, this blocks interrupt deliver.  So you
 * clear the bit to enable the interrupt.
 *
 * Interrupts numbered less than 0x10 are software triggered interrupts
 * and unused by Linux.
 *
 * Interrupt level assignment on sun4m:
 *
 *	level		source
 * ------------------------------------------------------------
 *	  1		softint-1
 *	  2		softint-2, VME/SBUS level 1
 *	  3		softint-3, VME/SBUS level 2
 *	  4		softint-4, onboard SCSI
 *	  5		softint-5, VME/SBUS level 3
 *	  6		softint-6, onboard ETHERNET
 *	  7		softint-7, VME/SBUS level 4
 *	  8		softint-8, onboard VIDEO
 *	  9		softint-9, VME/SBUS level 5, Module Interrupt
 *	 10		softint-10, system counter/timer
 *	 11		softint-11, VME/SBUS level 6, Floppy
 *	 12		softint-12, Keyboard/Mouse, Serial
 *	 13		softint-13, VME/SBUS level 7, ISDN Audio
 *	 14		softint-14, per-processor counter/timer
 *	 15		softint-15, Asynchronous Errors (broadcast)
 *
 * Each interrupt source is masked distinctly in the sun4m interrupt
 * registers.  The PIL level alone is therefore ambiguous, since multiple
 * interrupt sources map to a single PIL.
 *
 * This ambiguity is resolved in the 'intr' property for device nodes
 * in the OF device tree.  Each 'intr' property entry is composed of
 * two 32-bit words.  The first word is the IRQ priority value, which
 * is what we're intersted in.  The second word is the IRQ vector, which
 * is unused.
 *
 * The low 4 bits of the IRQ priority indicate the PIL, and the upper
 * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled.  0x20
 * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled.
 *
 * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI
 * whereas a value of 0x33 is SBUS level 2.  Here are some sample
 * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and
 * Tadpole S3 GX systems.
 *
 * esp:		0x24	onboard ESP SCSI
 * le:		0x26	onboard Lance ETHERNET
 * p9100:	0x32	SBUS level 1 P9100 video
 * bpp:		0x33	SBUS level 2 BPP parallel port device
 * DBRI:	0x39	SBUS level 5 DBRI ISDN audio
 * SUNW,leo:	0x39	SBUS level 5 LEO video
 * pcmcia:	0x3b	SBUS level 6 PCMCIA controller
 * uctrl:	0x3b	SBUS level 6 UCTRL device
 * modem:	0x3d	SBUS level 7 MODEM
 * zs:		0x2c	onboard keyboard/mouse/serial
 * floppy:	0x2b	onboard Floppy
 * power:	0x22	onboard power device (XXX unknown mask bit XXX)
 */


/* Code in entry.S needs to get at these register mappings.  */
struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS];
struct sun4m_irq_global __iomem *sun4m_irq_global;

struct sun4m_handler_data {
	bool    percpu;
	long    mask;
};

/* Dave Redman (djhr@tadpole.co.uk)
 * The sun4m interrupt registers.
 */
#define SUN4M_INT_ENABLE	0x80000000
#define SUN4M_INT_E14		0x00000080
#define SUN4M_INT_E10		0x00080000

#define	SUN4M_INT_MASKALL	0x80000000	  /* mask all interrupts */
#define	SUN4M_INT_MODULE_ERR	0x40000000	  /* module error */
#define	SUN4M_INT_M2S_WRITE_ERR	0x20000000	  /* write buffer error */
#define	SUN4M_INT_ECC_ERR	0x10000000	  /* ecc memory error */
#define	SUN4M_INT_VME_ERR	0x08000000	  /* vme async error */
#define	SUN4M_INT_FLOPPY	0x00400000	  /* floppy disk */
#define	SUN4M_INT_MODULE	0x00200000	  /* module interrupt */
#define	SUN4M_INT_VIDEO		0x00100000	  /* onboard video */
#define	SUN4M_INT_REALTIME	0x00080000	  /* system timer */
#define	SUN4M_INT_SCSI		0x00040000	  /* onboard scsi */
#define	SUN4M_INT_AUDIO		0x00020000	  /* audio/isdn */
#define	SUN4M_INT_ETHERNET	0x00010000	  /* onboard ethernet */
#define	SUN4M_INT_SERIAL	0x00008000	  /* serial ports */
#define	SUN4M_INT_KBDMS		0x00004000	  /* keyboard/mouse */
#define	SUN4M_INT_SBUSBITS	0x00003F80	  /* sbus int bits */
#define	SUN4M_INT_VMEBITS	0x0000007F	  /* vme int bits */

#define	SUN4M_INT_ERROR		(SUN4M_INT_MODULE_ERR |    \
				 SUN4M_INT_M2S_WRITE_ERR | \
				 SUN4M_INT_ECC_ERR |       \
				 SUN4M_INT_VME_ERR)

#define SUN4M_INT_SBUS(x)	(1 << (x+7))
#define SUN4M_INT_VME(x)	(1 << (x))

/* Interrupt levels used by OBP */
#define	OBP_INT_LEVEL_SOFT	0x10
#define	OBP_INT_LEVEL_ONBOARD	0x20
#define	OBP_INT_LEVEL_SBUS	0x30
#define	OBP_INT_LEVEL_VME	0x40

#define SUN4M_TIMER_IRQ         (OBP_INT_LEVEL_ONBOARD | 10)
#define SUN4M_PROFILE_IRQ       (OBP_INT_LEVEL_ONBOARD | 14)

static unsigned long sun4m_imask[0x50] = {
	/* 0x00 - SMP */
	0,  SUN4M_SOFT_INT(1),
	SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
	SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
	SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
	SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
	SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
	SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
	SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
	/* 0x10 - soft */
	0,  SUN4M_SOFT_INT(1),
	SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
	SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
	SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
	SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
	SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
	SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
	SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
	/* 0x20 - onboard */
	0, 0, 0, 0,
	SUN4M_INT_SCSI,  0, SUN4M_INT_ETHERNET, 0,
	SUN4M_INT_VIDEO, SUN4M_INT_MODULE,
	SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY,
	(SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),
	SUN4M_INT_AUDIO, SUN4M_INT_E14, SUN4M_INT_MODULE_ERR,
	/* 0x30 - sbus */
	0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1),
	0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3),
	0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5),
	0, SUN4M_INT_SBUS(6), 0, 0,
	/* 0x40 - vme */
	0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1),
	0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3),
	0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5),
	0, SUN4M_INT_VME(6), 0, 0
};

static void sun4m_mask_irq(struct irq_data *data)
{
	struct sun4m_handler_data *handler_data;
	int cpu = smp_processor_id();

	handler_data = irq_data_get_irq_handler_data(data);
	if (handler_data->mask) {
		unsigned long flags;

		local_irq_save(flags);
		if (handler_data->percpu) {
			sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->set);
		} else {
			sbus_writel(handler_data->mask, &sun4m_irq_global->mask_set);
		}
		local_irq_restore(flags);
	}
}

static void sun4m_unmask_irq(struct irq_data *data)
{
	struct sun4m_handler_data *handler_data;
	int cpu = smp_processor_id();

	handler_data = irq_data_get_irq_handler_data(data);
	if (handler_data->mask) {
		unsigned long flags;

		local_irq_save(flags);
		if (handler_data->percpu) {
			sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->clear);
		} else {
			sbus_writel(handler_data->mask, &sun4m_irq_global->mask_clear);
		}
		local_irq_restore(flags);
	}
}

static unsigned int sun4m_startup_irq(struct irq_data *data)
{
	irq_link(data->irq);
	sun4m_unmask_irq(data);
	return 0;
}

static void sun4m_shutdown_irq(struct irq_data *data)
{
	sun4m_mask_irq(data);
	irq_unlink(data->irq);
}

static struct irq_chip sun4m_irq = {
	.name		= "sun4m",
	.irq_startup	= sun4m_startup_irq,
	.irq_shutdown	= sun4m_shutdown_irq,
	.irq_mask	= sun4m_mask_irq,
	.irq_unmask	= sun4m_unmask_irq,
};


static unsigned int sun4m_build_device_irq(struct platform_device *op,
					   unsigned int real_irq)
{
	struct sun4m_handler_data *handler_data;
	unsigned int irq;
	unsigned int pil;

	if (real_irq >= OBP_INT_LEVEL_VME) {
		prom_printf("Bogus sun4m IRQ %u\n", real_irq);
		prom_halt();
	}
	pil = (real_irq & 0xf);
	irq = irq_alloc(real_irq, pil);

	if (irq == 0)
		goto out;

	handler_data = irq_get_handler_data(irq);
	if (unlikely(handler_data))
		goto out;

	handler_data = kzalloc(sizeof(struct sun4m_handler_data), GFP_ATOMIC);
	if (unlikely(!handler_data)) {
		prom_printf("IRQ: kzalloc(sun4m_handler_data) failed.\n");
		prom_halt();
	}

	handler_data->mask = sun4m_imask[real_irq];
	handler_data->percpu = real_irq < OBP_INT_LEVEL_ONBOARD;
	irq_set_chip_and_handler_name(irq, &sun4m_irq,
	                              handle_level_irq, "level");
	irq_set_handler_data(irq, handler_data);

out:
	return irq;
}

struct sun4m_timer_percpu {
	u32		l14_limit;
	u32		l14_count;
	u32		l14_limit_noclear;
	u32		user_timer_start_stop;
};

static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS];

struct sun4m_timer_global {
	u32		l10_limit;
	u32		l10_count;
	u32		l10_limit_noclear;
	u32		reserved;
	u32		timer_config;
};

static struct sun4m_timer_global __iomem *timers_global;

static void sun4m_clear_clock_irq(void)
{
	sbus_readl(&timers_global->l10_limit);
}

void sun4m_nmi(struct pt_regs *regs)
{
	unsigned long afsr, afar, si;

	printk(KERN_ERR "Aieee: sun4m NMI received!\n");
	/* XXX HyperSparc hack XXX */
	__asm__ __volatile__("mov 0x500, %%g1\n\t"
			     "lda [%%g1] 0x4, %0\n\t"
			     "mov 0x600, %%g1\n\t"
			     "lda [%%g1] 0x4, %1\n\t" :
			     "=r" (afsr), "=r" (afar));
	printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar);
	si = sbus_readl(&sun4m_irq_global->pending);
	printk(KERN_ERR "si=%08lx\n", si);
	if (si & SUN4M_INT_MODULE_ERR)
		printk(KERN_ERR "Module async error\n");
	if (si & SUN4M_INT_M2S_WRITE_ERR)
		printk(KERN_ERR "MBus/SBus async error\n");
	if (si & SUN4M_INT_ECC_ERR)
		printk(KERN_ERR "ECC memory error\n");
	if (si & SUN4M_INT_VME_ERR)
		printk(KERN_ERR "VME async error\n");
	printk(KERN_ERR "you lose buddy boy...\n");
	show_regs(regs);
	prom_halt();
}

void sun4m_unmask_profile_irq(void)
{
	unsigned long flags;

	local_irq_save(flags);
	sbus_writel(sun4m_imask[SUN4M_PROFILE_IRQ], &sun4m_irq_global->mask_clear);
	local_irq_restore(flags);
}

void sun4m_clear_profile_irq(int cpu)
{
	sbus_readl(&timers_percpu[cpu]->l14_limit);
}

static void sun4m_load_profile_irq(int cpu, unsigned int limit)
{
	unsigned int value = limit ? timer_value(limit) : 0;
	sbus_writel(value, &timers_percpu[cpu]->l14_limit);
}

static void __init sun4m_init_timers(void)
{
	struct device_node *dp = of_find_node_by_name(NULL, "counter");
	int i, err, len, num_cpu_timers;
	unsigned int irq;
	const u32 *addr;

	if (!dp) {
		printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n");
		return;
	}

	addr = of_get_property(dp, "address", &len);
	of_node_put(dp);
	if (!addr) {
		printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
		return;
	}

	num_cpu_timers = (len / sizeof(u32)) - 1;
	for (i = 0; i < num_cpu_timers; i++) {
		timers_percpu[i] = (void __iomem *)
			(unsigned long) addr[i];
	}
	timers_global = (void __iomem *)
		(unsigned long) addr[num_cpu_timers];

	/* Every per-cpu timer works in timer mode */
	sbus_writel(0x00000000, &timers_global->timer_config);

#ifdef CONFIG_SMP
	sparc_config.cs_period = SBUS_CLOCK_RATE * 2;  /* 2 seconds */
	sparc_config.features |= FEAT_L14_ONESHOT;
#else
	sparc_config.cs_period = SBUS_CLOCK_RATE / HZ; /* 1/HZ sec  */
	sparc_config.features |= FEAT_L10_CLOCKEVENT;
#endif
	sparc_config.features |= FEAT_L10_CLOCKSOURCE;
	sbus_writel(timer_value(sparc_config.cs_period),
	            &timers_global->l10_limit);

	master_l10_counter = &timers_global->l10_count;

	irq = sun4m_build_device_irq(NULL, SUN4M_TIMER_IRQ);

	err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
	if (err) {
		printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n",
			err);
		return;
	}

	for (i = 0; i < num_cpu_timers; i++)
		sbus_writel(0, &timers_percpu[i]->l14_limit);
	if (num_cpu_timers == 4)
		sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set);

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

		/* 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);
		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_ops->cache_all();
		local_irq_restore(flags);
	}
#endif
}

void __init sun4m_init_IRQ(void)
{
	struct device_node *dp = of_find_node_by_name(NULL, "interrupt");
	int len, i, mid, num_cpu_iregs;
	const u32 *addr;

	if (!dp) {
		printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n");
		return;
	}

	addr = of_get_property(dp, "address", &len);
	of_node_put(dp);
	if (!addr) {
		printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
		return;
	}

	num_cpu_iregs = (len / sizeof(u32)) - 1;
	for (i = 0; i < num_cpu_iregs; i++) {
		sun4m_irq_percpu[i] = (void __iomem *)
			(unsigned long) addr[i];
	}
	sun4m_irq_global = (void __iomem *)
		(unsigned long) addr[num_cpu_iregs];

	local_irq_disable();

	sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set);
	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
		sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear);

	if (num_cpu_iregs == 4)
		sbus_writel(0, &sun4m_irq_global->interrupt_target);

	sparc_config.init_timers      = sun4m_init_timers;
	sparc_config.build_device_irq = sun4m_build_device_irq;
	sparc_config.clock_rate       = SBUS_CLOCK_RATE;
	sparc_config.clear_clock_irq  = sun4m_clear_clock_irq;
	sparc_config.load_profile_irq = sun4m_load_profile_irq;


	/* Cannot enable interrupts until OBP ticker is disabled. */
}