summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/ipic.c
blob: 522aa14e8f0d195057dadf8b40e84cafa63151fe (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
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
/*
 * arch/powerpc/sysdev/ipic.c
 *
 * IPIC routines implementations.
 *
 * Copyright 2005 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/sysdev.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/ipic.h>

#include "ipic.h"

static struct ipic * primary_ipic;
static DEFINE_SPINLOCK(ipic_lock);

static struct ipic_info ipic_info[] = {
	[9] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 24,
		.prio_mask = 0,
	},
	[10] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 25,
		.prio_mask = 1,
	},
	[11] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 26,
		.prio_mask = 2,
	},
	[14] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 29,
		.prio_mask = 5,
	},
	[15] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 30,
		.prio_mask = 6,
	},
	[16] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_D,
		.force	= IPIC_SIFCR_H,
		.bit	= 31,
		.prio_mask = 7,
	},
	[17] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SEFCR,
		.bit	= 1,
		.prio_mask = 5,
	},
	[18] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SEFCR,
		.bit	= 2,
		.prio_mask = 6,
	},
	[19] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SEFCR,
		.bit	= 3,
		.prio_mask = 7,
	},
	[20] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SEFCR,
		.bit	= 4,
		.prio_mask = 4,
	},
	[21] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SEFCR,
		.bit	= 5,
		.prio_mask = 5,
	},
	[22] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SEFCR,
		.bit	= 6,
		.prio_mask = 6,
	},
	[23] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SEFCR,
		.bit	= 7,
		.prio_mask = 7,
	},
	[32] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 0,
		.prio_mask = 0,
	},
	[33] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 1,
		.prio_mask = 1,
	},
	[34] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 2,
		.prio_mask = 2,
	},
	[35] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 3,
		.prio_mask = 3,
	},
	[36] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 4,
		.prio_mask = 4,
	},
	[37] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 5,
		.prio_mask = 5,
	},
	[38] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 6,
		.prio_mask = 6,
	},
	[39] = {
		.pend	= IPIC_SIPNR_H,
		.mask	= IPIC_SIMSR_H,
		.prio	= IPIC_SIPRR_A,
		.force	= IPIC_SIFCR_H,
		.bit	= 7,
		.prio_mask = 7,
	},
	[48] = {
		.pend	= IPIC_SEPNR,
		.mask	= IPIC_SEMSR,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SEFCR,
		.bit	= 0,
		.prio_mask = 4,
	},
	[64] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SIFCR_L,
		.bit	= 0,
		.prio_mask = 0,
	},
	[65] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SIFCR_L,
		.bit	= 1,
		.prio_mask = 1,
	},
	[66] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SIFCR_L,
		.bit	= 2,
		.prio_mask = 2,
	},
	[67] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_A,
		.force	= IPIC_SIFCR_L,
		.bit	= 3,
		.prio_mask = 3,
	},
	[68] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SIFCR_L,
		.bit	= 4,
		.prio_mask = 0,
	},
	[69] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SIFCR_L,
		.bit	= 5,
		.prio_mask = 1,
	},
	[70] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SIFCR_L,
		.bit	= 6,
		.prio_mask = 2,
	},
	[71] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= IPIC_SMPRR_B,
		.force	= IPIC_SIFCR_L,
		.bit	= 7,
		.prio_mask = 3,
	},
	[72] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 8,
	},
	[73] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 9,
	},
	[74] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 10,
	},
	[75] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 11,
	},
	[76] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 12,
	},
	[77] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 13,
	},
	[78] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 14,
	},
	[79] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 15,
	},
	[80] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 16,
	},
	[84] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 20,
	},
	[85] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 21,
	},
	[90] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 26,
	},
	[91] = {
		.pend	= IPIC_SIPNR_L,
		.mask	= IPIC_SIMSR_L,
		.prio	= 0,
		.force	= IPIC_SIFCR_L,
		.bit	= 27,
	},
};

static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
{
	return in_be32(base + (reg >> 2));
}

static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
{
	out_be32(base + (reg >> 2), value);
}

static inline struct ipic * ipic_from_irq(unsigned int virq)
{
	return primary_ipic;
}

#define ipic_irq_to_hw(virq)	((unsigned int)irq_map[virq].hwirq)

static void ipic_unmask_irq(unsigned int virq)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	unsigned long flags;
	u32 temp;

	spin_lock_irqsave(&ipic_lock, flags);

	temp = ipic_read(ipic->regs, ipic_info[src].mask);
	temp |= (1 << (31 - ipic_info[src].bit));
	ipic_write(ipic->regs, ipic_info[src].mask, temp);

	spin_unlock_irqrestore(&ipic_lock, flags);
}

static void ipic_mask_irq(unsigned int virq)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	unsigned long flags;
	u32 temp;

	spin_lock_irqsave(&ipic_lock, flags);

	temp = ipic_read(ipic->regs, ipic_info[src].mask);
	temp &= ~(1 << (31 - ipic_info[src].bit));
	ipic_write(ipic->regs, ipic_info[src].mask, temp);

	spin_unlock_irqrestore(&ipic_lock, flags);
}

static void ipic_ack_irq(unsigned int virq)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	unsigned long flags;
	u32 temp;

	spin_lock_irqsave(&ipic_lock, flags);

	temp = ipic_read(ipic->regs, ipic_info[src].pend);
	temp |= (1 << (31 - ipic_info[src].bit));
	ipic_write(ipic->regs, ipic_info[src].pend, temp);

	spin_unlock_irqrestore(&ipic_lock, flags);
}

static void ipic_mask_irq_and_ack(unsigned int virq)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	unsigned long flags;
	u32 temp;

	spin_lock_irqsave(&ipic_lock, flags);

	temp = ipic_read(ipic->regs, ipic_info[src].mask);
	temp &= ~(1 << (31 - ipic_info[src].bit));
	ipic_write(ipic->regs, ipic_info[src].mask, temp);

	temp = ipic_read(ipic->regs, ipic_info[src].pend);
	temp |= (1 << (31 - ipic_info[src].bit));
	ipic_write(ipic->regs, ipic_info[src].pend, temp);

	spin_unlock_irqrestore(&ipic_lock, flags);
}

static int ipic_set_irq_type(unsigned int virq, unsigned int flow_type)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	struct irq_desc *desc = get_irq_desc(virq);
	unsigned int vold, vnew, edibit;

	if (flow_type == IRQ_TYPE_NONE)
		flow_type = IRQ_TYPE_LEVEL_LOW;

	/* ipic supports only low assertion and high-to-low change senses
	 */
	if (!(flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))) {
		printk(KERN_ERR "ipic: sense type 0x%x not supported\n",
			flow_type);
		return -EINVAL;
	}

	desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
	desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
	if (flow_type & IRQ_TYPE_LEVEL_LOW)  {
		desc->status |= IRQ_LEVEL;
		desc->handle_irq = handle_level_irq;
	} else {
		desc->handle_irq = handle_edge_irq;
	}

	/* only EXT IRQ senses are programmable on ipic
	 * internal IRQ senses are LEVEL_LOW
	 */
	if (src == IPIC_IRQ_EXT0)
		edibit = 15;
	else
		if (src >= IPIC_IRQ_EXT1 && src <= IPIC_IRQ_EXT7)
			edibit = (14 - (src - IPIC_IRQ_EXT1));
		else
			return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;

	vold = ipic_read(ipic->regs, IPIC_SECNR);
	if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) {
		vnew = vold | (1 << edibit);
	} else {
		vnew = vold & ~(1 << edibit);
	}
	if (vold != vnew)
		ipic_write(ipic->regs, IPIC_SECNR, vnew);
	return 0;
}

static struct irq_chip ipic_irq_chip = {
	.typename	= " IPIC  ",
	.unmask		= ipic_unmask_irq,
	.mask		= ipic_mask_irq,
	.mask_ack	= ipic_mask_irq_and_ack,
	.ack		= ipic_ack_irq,
	.set_type	= ipic_set_irq_type,
};

static int ipic_host_match(struct irq_host *h, struct device_node *node)
{
	struct ipic *ipic = h->host_data;

	/* Exact match, unless ipic node is NULL */
	return ipic->of_node == NULL || ipic->of_node == node;
}

static int ipic_host_map(struct irq_host *h, unsigned int virq,
			 irq_hw_number_t hw)
{
	struct ipic *ipic = h->host_data;
	struct irq_chip *chip;

	/* Default chip */
	chip = &ipic->hc_irq;

	set_irq_chip_data(virq, ipic);
	set_irq_chip_and_handler(virq, chip, handle_level_irq);

	/* Set default irq type */
	set_irq_type(virq, IRQ_TYPE_NONE);

	return 0;
}

static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
			   u32 *intspec, unsigned int intsize,
			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)

{
	/* interrupt sense values coming from the device tree equal either
	 * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
	 */
	*out_hwirq = intspec[0];
	if (intsize > 1)
		*out_flags = intspec[1];
	else
		*out_flags = IRQ_TYPE_NONE;
	return 0;
}

static struct irq_host_ops ipic_host_ops = {
	.match	= ipic_host_match,
	.map	= ipic_host_map,
	.xlate	= ipic_host_xlate,
};

void __init ipic_init(struct device_node *node,
		unsigned int flags)
{
	struct ipic	*ipic;
	struct resource res;
	u32 temp = 0, ret;

	ipic = alloc_bootmem(sizeof(struct ipic));
	if (ipic == NULL)
		return;

	memset(ipic, 0, sizeof(struct ipic));
	ipic->of_node = of_node_get(node);

	ipic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
				       NR_IPIC_INTS,
				       &ipic_host_ops, 0);
	if (ipic->irqhost == NULL) {
		of_node_put(node);
		return;
	}

	ret = of_address_to_resource(node, 0, &res);
	if (ret)
		return;

	ipic->regs = ioremap(res.start, res.end - res.start + 1);

	ipic->irqhost->host_data = ipic;
	ipic->hc_irq = ipic_irq_chip;

	/* init hw */
	ipic_write(ipic->regs, IPIC_SICNR, 0x0);

	/* default priority scheme is grouped. If spread mode is required
	 * configure SICFR accordingly */
	if (flags & IPIC_SPREADMODE_GRP_A)
		temp |= SICFR_IPSA;
	if (flags & IPIC_SPREADMODE_GRP_D)
		temp |= SICFR_IPSD;
	if (flags & IPIC_SPREADMODE_MIX_A)
		temp |= SICFR_MPSA;
	if (flags & IPIC_SPREADMODE_MIX_B)
		temp |= SICFR_MPSB;

	ipic_write(ipic->regs, IPIC_SICNR, temp);

	/* handle MCP route */
	temp = 0;
	if (flags & IPIC_DISABLE_MCP_OUT)
		temp = SERCR_MCPR;
	ipic_write(ipic->regs, IPIC_SERCR, temp);

	/* handle routing of IRQ0 to MCP */
	temp = ipic_read(ipic->regs, IPIC_SEMSR);

	if (flags & IPIC_IRQ0_MCP)
		temp |= SEMSR_SIRQ0;
	else
		temp &= ~SEMSR_SIRQ0;

	ipic_write(ipic->regs, IPIC_SEMSR, temp);

	primary_ipic = ipic;
	irq_set_default_host(primary_ipic->irqhost);

	printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
			primary_ipic->regs);
}

int ipic_set_priority(unsigned int virq, unsigned int priority)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	u32 temp;

	if (priority > 7)
		return -EINVAL;
	if (src > 127)
		return -EINVAL;
	if (ipic_info[src].prio == 0)
		return -EINVAL;

	temp = ipic_read(ipic->regs, ipic_info[src].prio);

	if (priority < 4) {
		temp &= ~(0x7 << (20 + (3 - priority) * 3));
		temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
	} else {
		temp &= ~(0x7 << (4 + (7 - priority) * 3));
		temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
	}

	ipic_write(ipic->regs, ipic_info[src].prio, temp);

	return 0;
}

void ipic_set_highest_priority(unsigned int virq)
{
	struct ipic *ipic = ipic_from_irq(virq);
	unsigned int src = ipic_irq_to_hw(virq);
	u32 temp;

	temp = ipic_read(ipic->regs, IPIC_SICFR);

	/* clear and set HPI */
	temp &= 0x7f000000;
	temp |= (src & 0x7f) << 24;

	ipic_write(ipic->regs, IPIC_SICFR, temp);
}

void ipic_set_default_priority(void)
{
	ipic_write(primary_ipic->regs, IPIC_SIPRR_A, IPIC_SIPRR_A_DEFAULT);
	ipic_write(primary_ipic->regs, IPIC_SIPRR_D, IPIC_SIPRR_D_DEFAULT);
	ipic_write(primary_ipic->regs, IPIC_SMPRR_A, IPIC_SMPRR_A_DEFAULT);
	ipic_write(primary_ipic->regs, IPIC_SMPRR_B, IPIC_SMPRR_B_DEFAULT);
}

void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
{
	struct ipic *ipic = primary_ipic;
	u32 temp;

	temp = ipic_read(ipic->regs, IPIC_SERMR);
	temp |= (1 << (31 - mcp_irq));
	ipic_write(ipic->regs, IPIC_SERMR, temp);
}

void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
{
	struct ipic *ipic = primary_ipic;
	u32 temp;

	temp = ipic_read(ipic->regs, IPIC_SERMR);
	temp &= (1 << (31 - mcp_irq));
	ipic_write(ipic->regs, IPIC_SERMR, temp);
}

u32 ipic_get_mcp_status(void)
{
	return ipic_read(primary_ipic->regs, IPIC_SERMR);
}

void ipic_clear_mcp_status(u32 mask)
{
	ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
}

/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
unsigned int ipic_get_irq(void)
{
	int irq;

	BUG_ON(primary_ipic == NULL);

#define IPIC_SIVCR_VECTOR_MASK	0x7f
	irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & IPIC_SIVCR_VECTOR_MASK;

	if (irq == 0)    /* 0 --> no irq is pending */
		return NO_IRQ;

	return irq_linear_revmap(primary_ipic->irqhost, irq);
}

static struct sysdev_class ipic_sysclass = {
	set_kset_name("ipic"),
};

static struct sys_device device_ipic = {
	.id		= 0,
	.cls		= &ipic_sysclass,
};

static int __init init_ipic_sysfs(void)
{
	int rc;

	if (!primary_ipic->regs)
		return -ENODEV;
	printk(KERN_DEBUG "Registering ipic with sysfs...\n");

	rc = sysdev_class_register(&ipic_sysclass);
	if (rc) {
		printk(KERN_ERR "Failed registering ipic sys class\n");
		return -ENODEV;
	}
	rc = sysdev_register(&device_ipic);
	if (rc) {
		printk(KERN_ERR "Failed registering ipic sys device\n");
		return -ENODEV;
	}
	return 0;
}

subsys_initcall(init_ipic_sysfs);