aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/mpic.c
blob: bffe50d02c99578fc75f85055387216ee8a88761 (plain) (blame)
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
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
/*
 *  arch/powerpc/kernel/mpic.c
 *
 *  Driver for interrupt controllers following the OpenPIC standard, the
 *  common implementation beeing IBM's MPIC. This driver also can deal
 *  with various broken implementations of this HW.
 *
 *  Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive
 *  for more details.
 */

#undef DEBUG
#undef DEBUG_IPI
#undef DEBUG_IRQ
#undef DEBUG_LOW

#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/pci.h>

#include <asm/ptrace.h>
#include <asm/signal.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/mpic.h>
#include <asm/smp.h>

#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif

static struct mpic *mpics;
static struct mpic *mpic_primary;
static DEFINE_SPINLOCK(mpic_lock);

#ifdef CONFIG_PPC32	/* XXX for now */
#ifdef CONFIG_IRQ_ALL_CPUS
#define distribute_irqs	(1)
#else
#define distribute_irqs	(0)
#endif
#endif

/*
 * Register accessor functions
 */


static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
			    unsigned int reg)
{
	if (be)
		return in_be32(base + (reg >> 2));
	else
		return in_le32(base + (reg >> 2));
}

static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
			      unsigned int reg, u32 value)
{
	if (be)
		out_be32(base + (reg >> 2), value);
	else
		out_le32(base + (reg >> 2), value);
}

static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
{
	unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
	unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);

	if (mpic->flags & MPIC_BROKEN_IPI)
		be = !be;
	return _mpic_read(be, mpic->gregs, offset);
}

static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
{
	unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);

	_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
}

static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
{
	unsigned int cpu = 0;

	if (mpic->flags & MPIC_PRIMARY)
		cpu = hard_smp_processor_id();

	return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg);
}

static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
{
	unsigned int cpu = 0;

	if (mpic->flags & MPIC_PRIMARY)
		cpu = hard_smp_processor_id();

	_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
}

static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
{
	unsigned int	isu = src_no >> mpic->isu_shift;
	unsigned int	idx = src_no & mpic->isu_mask;

	return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
			  reg + (idx * MPIC_IRQ_STRIDE));
}

static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
				   unsigned int reg, u32 value)
{
	unsigned int	isu = src_no >> mpic->isu_shift;
	unsigned int	idx = src_no & mpic->isu_mask;

	_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
		    reg + (idx * MPIC_IRQ_STRIDE), value);
}

#define mpic_read(b,r)		_mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
#define mpic_write(b,r,v)	_mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
#define mpic_ipi_read(i)	_mpic_ipi_read(mpic,(i))
#define mpic_ipi_write(i,v)	_mpic_ipi_write(mpic,(i),(v))
#define mpic_cpu_read(i)	_mpic_cpu_read(mpic,(i))
#define mpic_cpu_write(i,v)	_mpic_cpu_write(mpic,(i),(v))
#define mpic_irq_read(s,r)	_mpic_irq_read(mpic,(s),(r))
#define mpic_irq_write(s,r,v)	_mpic_irq_write(mpic,(s),(r),(v))


/*
 * Low level utility functions
 */



/* Check if we have one of those nice broken MPICs with a flipped endian on
 * reads from IPI registers
 */
static void __init mpic_test_broken_ipi(struct mpic *mpic)
{
	u32 r;

	mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK);
	r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0);

	if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
		printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
		mpic->flags |= MPIC_BROKEN_IPI;
	}
}

#ifdef CONFIG_MPIC_BROKEN_U3

/* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
 * to force the edge setting on the MPIC and do the ack workaround.
 */
static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
{
	if (source >= 128 || !mpic->fixups)
		return 0;
	return mpic->fixups[source].base != NULL;
}


static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
{
	struct mpic_irq_fixup *fixup = &mpic->fixups[source];

	if (fixup->applebase) {
		unsigned int soff = (fixup->index >> 3) & ~3;
		unsigned int mask = 1U << (fixup->index & 0x1f);
		writel(mask, fixup->applebase + soff);
	} else {
		spin_lock(&mpic->fixup_lock);
		writeb(0x11 + 2 * fixup->index, fixup->base + 2);
		writel(fixup->data, fixup->base + 4);
		spin_unlock(&mpic->fixup_lock);
	}
}

static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
				      unsigned int irqflags)
{
	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
	unsigned long flags;
	u32 tmp;

	if (fixup->base == NULL)
		return;

	DBG("startup_ht_interrupt(%u, %u) index: %d\n",
	    source, irqflags, fixup->index);
	spin_lock_irqsave(&mpic->fixup_lock, flags);
	/* Enable and configure */
	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
	tmp = readl(fixup->base + 4);
	tmp &= ~(0x23U);
	if (irqflags & IRQ_LEVEL)
		tmp |= 0x22;
	writel(tmp, fixup->base + 4);
	spin_unlock_irqrestore(&mpic->fixup_lock, flags);
}

static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
				       unsigned int irqflags)
{
	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
	unsigned long flags;
	u32 tmp;

	if (fixup->base == NULL)
		return;

	DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags);

	/* Disable */
	spin_lock_irqsave(&mpic->fixup_lock, flags);
	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
	tmp = readl(fixup->base + 4);
	tmp |= 1;
	writel(tmp, fixup->base + 4);
	spin_unlock_irqrestore(&mpic->fixup_lock, flags);
}

static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
				    unsigned int devfn, u32 vdid)
{
	int i, irq, n;
	u8 __iomem *base;
	u32 tmp;
	u8 pos;

	for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
	     pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
		u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
		if (id == PCI_CAP_ID_HT_IRQCONF) {
			id = readb(devbase + pos + 3);
			if (id == 0x80)
				break;
		}
	}
	if (pos == 0)
		return;

	base = devbase + pos;
	writeb(0x01, base + 2);
	n = (readl(base + 4) >> 16) & 0xff;

	printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
	       " has %d irqs\n",
	       devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);

	for (i = 0; i <= n; i++) {
		writeb(0x10 + 2 * i, base + 2);
		tmp = readl(base + 4);
		irq = (tmp >> 16) & 0xff;
		DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
		/* mask it , will be unmasked later */
		tmp |= 0x1;
		writel(tmp, base + 4);
		mpic->fixups[irq].index = i;
		mpic->fixups[irq].base = base;
		/* Apple HT PIC has a non-standard way of doing EOIs */
		if ((vdid & 0xffff) == 0x106b)
			mpic->fixups[irq].applebase = devbase + 0x60;
		else
			mpic->fixups[irq].applebase = NULL;
		writeb(0x11 + 2 * i, base + 2);
		mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
	}
}
 

static void __init mpic_scan_ht_pics(struct mpic *mpic)
{
	unsigned int devfn;
	u8 __iomem *cfgspace;

	printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");

	/* Allocate fixups array */
	mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
	BUG_ON(mpic->fixups == NULL);
	memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));

	/* Init spinlock */
	spin_lock_init(&mpic->fixup_lock);

	/* Map U3 config space. We assume all IO-APICs are on the primary bus
	 * so we only need to map 64kB.
	 */
	cfgspace = ioremap(0xf2000000, 0x10000);
	BUG_ON(cfgspace == NULL);

	/* Now we scan all slots. We do a very quick scan, we read the header
	 * type, vendor ID and device ID only, that's plenty enough
	 */
	for (devfn = 0; devfn < 0x100; devfn++) {
		u8 __iomem *devbase = cfgspace + (devfn << 8);
		u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
		u32 l = readl(devbase + PCI_VENDOR_ID);
		u16 s;

		DBG("devfn %x, l: %x\n", devfn, l);

		/* If no device, skip */
		if (l == 0xffffffff || l == 0x00000000 ||
		    l == 0x0000ffff || l == 0xffff0000)
			goto next;
		/* Check if is supports capability lists */
		s = readw(devbase + PCI_STATUS);
		if (!(s & PCI_STATUS_CAP_LIST))
			goto next;

		mpic_scan_ht_pic(mpic, devbase, devfn, l);

	next:
		/* next device, if function 0 */
		if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
			devfn += 7;
	}
}

#endif /* CONFIG_MPIC_BROKEN_U3 */


/* Find an mpic associated with a given linux interrupt */
static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
{
	struct mpic *mpic = mpics;

	while(mpic) {
		/* search IPIs first since they may override the main interrupts */
		if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) {
			if (is_ipi)
				*is_ipi = 1;
			return mpic;
		}
		if (irq >= mpic->irq_offset &&
		    irq < (mpic->irq_offset + mpic->irq_count)) {
			if (is_ipi)
				*is_ipi = 0;
			return mpic;
		}
		mpic = mpic -> next;
	}
	return NULL;
}

/* Convert a cpu mask from logical to physical cpu numbers. */
static inline u32 mpic_physmask(u32 cpumask)
{
	int i;
	u32 mask = 0;

	for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
		mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
	return mask;
}

#ifdef CONFIG_SMP
/* Get the mpic structure from the IPI number */
static inline struct mpic * mpic_from_ipi(unsigned int ipi)
{
	return container_of(irq_desc[ipi].handler, struct mpic, hc_ipi);
}
#endif

/* Get the mpic structure from the irq number */
static inline struct mpic * mpic_from_irq(unsigned int irq)
{
	return container_of(irq_desc[irq].handler, struct mpic, hc_irq);
}

/* Send an EOI */
static inline void mpic_eoi(struct mpic *mpic)
{
	mpic_cpu_write(MPIC_CPU_EOI, 0);
	(void)mpic_cpu_read(MPIC_CPU_WHOAMI);
}

#ifdef CONFIG_SMP
static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
	struct mpic *mpic = dev_id;

	smp_message_recv(irq - mpic->ipi_offset, regs);
	return IRQ_HANDLED;
}
#endif /* CONFIG_SMP */

/*
 * Linux descriptor level callbacks
 */


static void mpic_enable_irq(unsigned int irq)
{
	unsigned int loops = 100000;
	struct mpic *mpic = mpic_from_irq(irq);
	unsigned int src = irq - mpic->irq_offset;

	DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);

	mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
		       mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) &
		       ~MPIC_VECPRI_MASK);

	/* make sure mask gets to controller before we return to user */
	do {
		if (!loops--) {
			printk(KERN_ERR "mpic_enable_irq timeout\n");
			break;
		}
	} while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);	

#ifdef CONFIG_MPIC_BROKEN_U3
	if (mpic->flags & MPIC_BROKEN_U3) {
		unsigned int src = irq - mpic->irq_offset;
		if (mpic_is_ht_interrupt(mpic, src) &&
		    (irq_desc[irq].status & IRQ_LEVEL))
			mpic_ht_end_irq(mpic, src);
	}
#endif /* CONFIG_MPIC_BROKEN_U3 */
}

static unsigned int mpic_startup_irq(unsigned int irq)
{
#ifdef CONFIG_MPIC_BROKEN_U3
	struct mpic *mpic = mpic_from_irq(irq);
	unsigned int src = irq - mpic->irq_offset;
#endif /* CONFIG_MPIC_BROKEN_U3 */

	mpic_enable_irq(irq);

#ifdef CONFIG_MPIC_BROKEN_U3
	if (mpic_is_ht_interrupt(mpic, src))
		mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
#endif /* CONFIG_MPIC_BROKEN_U3 */

	return 0;
}

static void mpic_disable_irq(unsigned int irq)
{
	unsigned int loops = 100000;
	struct mpic *mpic = mpic_from_irq(irq);
	unsigned int src = irq - mpic->irq_offset;

	DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);

	mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
		       mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) |
		       MPIC_VECPRI_MASK);

	/* make sure mask gets to controller before we return to user */
	do {
		if (!loops--) {
			printk(KERN_ERR "mpic_enable_irq timeout\n");
			break;
		}
	} while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
}

static void mpic_shutdown_irq(unsigned int irq)
{
#ifdef CONFIG_MPIC_BROKEN_U3
	struct mpic *mpic = mpic_from_irq(irq);
	unsigned int src = irq - mpic->irq_offset;

	if (mpic_is_ht_interrupt(mpic, src))
		mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);

#endif /* CONFIG_MPIC_BROKEN_U3 */

	mpic_disable_irq(irq);
}

static void mpic_end_irq(unsigned int irq)
{
	struct mpic *mpic = mpic_from_irq(irq);

#ifdef DEBUG_IRQ
	DBG("%s: end_irq: %d\n", mpic->name, irq);
#endif
	/* We always EOI on end_irq() even for edge interrupts since that
	 * should only lower the priority, the MPIC should have properly
	 * latched another edge interrupt coming in anyway
	 */

#ifdef CONFIG_MPIC_BROKEN_U3
	if (mpic->flags & MPIC_BROKEN_U3) {
		unsigned int src = irq - mpic->irq_offset;
		if (mpic_is_ht_interrupt(mpic, src) &&
		    (irq_desc[irq].status & IRQ_LEVEL))
			mpic_ht_end_irq(mpic, src);
	}
#endif /* CONFIG_MPIC_BROKEN_U3 */

	mpic_eoi(mpic);
}

#ifdef CONFIG_SMP

static void mpic_enable_ipi(unsigned int irq)
{
	struct mpic *mpic = mpic_from_ipi(irq);
	unsigned int src = irq - mpic->ipi_offset;

	DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
	mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
}

static void mpic_disable_ipi(unsigned int irq)
{
	/* NEVER disable an IPI... that's just plain wrong! */
}

static void mpic_end_ipi(unsigned int irq)
{
	struct mpic *mpic = mpic_from_ipi(irq);

	/*
	 * IPIs are marked IRQ_PER_CPU. This has the side effect of
	 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
	 * applying to them. We EOI them late to avoid re-entering.
	 * We mark IPI's with SA_INTERRUPT as they must run with
	 * irqs disabled.
	 */
	mpic_eoi(mpic);
}

#endif /* CONFIG_SMP */

static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
{
	struct mpic *mpic = mpic_from_irq(irq);

	cpumask_t tmp;

	cpus_and(tmp, cpumask, cpu_online_map);

	mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION,
		       mpic_physmask(cpus_addr(tmp)[0]));	
}


/*
 * Exported functions
 */


struct mpic * __init mpic_alloc(unsigned long phys_addr,
				unsigned int flags,
				unsigned int isu_size,
				unsigned int irq_offset,
				unsigned int irq_count,
				unsigned int ipi_offset,
				unsigned char *senses,
				unsigned int senses_count,
				const char *name)
{
	struct mpic	*mpic;
	u32		reg;
	const char	*vers;
	int		i;

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

	memset(mpic, 0, sizeof(struct mpic));
	mpic->name = name;

	mpic->hc_irq.typename = name;
	mpic->hc_irq.startup = mpic_startup_irq;
	mpic->hc_irq.shutdown = mpic_shutdown_irq;
	mpic->hc_irq.enable = mpic_enable_irq;
	mpic->hc_irq.disable = mpic_disable_irq;
	mpic->hc_irq.end = mpic_end_irq;
	if (flags & MPIC_PRIMARY)
		mpic->hc_irq.set_affinity = mpic_set_affinity;
#ifdef CONFIG_SMP
	mpic->hc_ipi.typename = name;
	mpic->hc_ipi.enable = mpic_enable_ipi;
	mpic->hc_ipi.disable = mpic_disable_ipi;
	mpic->hc_ipi.end = mpic_end_ipi;
#endif /* CONFIG_SMP */

	mpic->flags = flags;
	mpic->isu_size = isu_size;
	mpic->irq_offset = irq_offset;
	mpic->irq_count = irq_count;
	mpic->ipi_offset = ipi_offset;
	mpic->num_sources = 0; /* so far */
	mpic->senses = senses;
	mpic->senses_count = senses_count;

	/* Map the global registers */
	mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
	mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
	BUG_ON(mpic->gregs == NULL);

	/* Reset */
	if (flags & MPIC_WANTS_RESET) {
		mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
			   mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
			   | MPIC_GREG_GCONF_RESET);
		while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
		       & MPIC_GREG_GCONF_RESET)
			mb();
	}

	/* Read feature register, calculate num CPUs and, for non-ISU
	 * MPICs, num sources as well. On ISU MPICs, sources are counted
	 * as ISUs are added
	 */
	reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0);
	mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
			  >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
	if (isu_size == 0)
		mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
				     >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;

	/* Map the per-CPU registers */
	for (i = 0; i < mpic->num_cpus; i++) {
		mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
					   i * MPIC_CPU_STRIDE, 0x1000);
		BUG_ON(mpic->cpuregs[i] == NULL);
	}

	/* Initialize main ISU if none provided */
	if (mpic->isu_size == 0) {
		mpic->isu_size = mpic->num_sources;
		mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE,
					MPIC_IRQ_STRIDE * mpic->isu_size);
		BUG_ON(mpic->isus[0] == NULL);
	}
	mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
	mpic->isu_mask = (1 << mpic->isu_shift) - 1;

	/* Display version */
	switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
	case 1:
		vers = "1.0";
		break;
	case 2:
		vers = "1.2";
		break;
	case 3:
		vers = "1.3";
		break;
	default:
		vers = "<unknown>";
		break;
	}
	printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
	       name, vers, phys_addr, mpic->num_cpus);
	printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
	       mpic->isu_shift, mpic->isu_mask);

	mpic->next = mpics;
	mpics = mpic;

	if (flags & MPIC_PRIMARY)
		mpic_primary = mpic;

	return mpic;
}

void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
			    unsigned long phys_addr)
{
	unsigned int isu_first = isu_num * mpic->isu_size;

	BUG_ON(isu_num >= MPIC_MAX_ISU);

	mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size);
	if ((isu_first + mpic->isu_size) > mpic->num_sources)
		mpic->num_sources = isu_first + mpic->isu_size;
}

void __init mpic_setup_cascade(unsigned int irq, mpic_cascade_t handler,
			       void *data)
{
	struct mpic *mpic = mpic_find(irq, NULL);
	unsigned long flags;

	/* Synchronization here is a bit dodgy, so don't try to replace cascade
	 * interrupts on the fly too often ... but normally it's set up at boot.
	 */
	spin_lock_irqsave(&mpic_lock, flags);
	if (mpic->cascade)	       
		mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset);
	mpic->cascade = NULL;
	wmb();
	mpic->cascade_vec = irq - mpic->irq_offset;
	mpic->cascade_data = data;
	wmb();
	mpic->cascade = handler;
	mpic_enable_irq(irq);
	spin_unlock_irqrestore(&mpic_lock, flags);
}

void __init mpic_init(struct mpic *mpic)
{
	int i;

	BUG_ON(mpic->num_sources == 0);

	printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);

	/* Set current processor priority to max */
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);

	/* Initialize timers: just disable them all */
	for (i = 0; i < 4; i++) {
		mpic_write(mpic->tmregs,
			   i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0);
		mpic_write(mpic->tmregs,
			   i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI,
			   MPIC_VECPRI_MASK |
			   (MPIC_VEC_TIMER_0 + i));
	}

	/* Initialize IPIs to our reserved vectors and mark them disabled for now */
	mpic_test_broken_ipi(mpic);
	for (i = 0; i < 4; i++) {
		mpic_ipi_write(i,
			       MPIC_VECPRI_MASK |
			       (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
			       (MPIC_VEC_IPI_0 + i));
#ifdef CONFIG_SMP
		if (!(mpic->flags & MPIC_PRIMARY))
			continue;
		irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU;
		irq_desc[mpic->ipi_offset+i].handler = &mpic->hc_ipi;
#endif /* CONFIG_SMP */
	}

	/* Initialize interrupt sources */
	if (mpic->irq_count == 0)
		mpic->irq_count = mpic->num_sources;

#ifdef CONFIG_MPIC_BROKEN_U3
	/* Do the HT PIC fixups on U3 broken mpic */
	DBG("MPIC flags: %x\n", mpic->flags);
	if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
		mpic_scan_ht_pics(mpic);
#endif /* CONFIG_MPIC_BROKEN_U3 */

	for (i = 0; i < mpic->num_sources; i++) {
		/* start with vector = source number, and masked */
		u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
		int level = 0;
		
		/* if it's an IPI, we skip it */
		if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) &&
		    (mpic->irq_offset + i) <  (mpic->ipi_offset + i + 4))
			continue;

		/* do senses munging */
		if (mpic->senses && i < mpic->senses_count) {
			if (mpic->senses[i] & IRQ_SENSE_LEVEL)
				vecpri |= MPIC_VECPRI_SENSE_LEVEL;
			if (mpic->senses[i] & IRQ_POLARITY_POSITIVE)
				vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
		} else
			vecpri |= MPIC_VECPRI_SENSE_LEVEL;

		/* remember if it was a level interrupts */
		level = (vecpri & MPIC_VECPRI_SENSE_LEVEL);

		/* deal with broken U3 */
		if (mpic->flags & MPIC_BROKEN_U3) {
#ifdef CONFIG_MPIC_BROKEN_U3
			if (mpic_is_ht_interrupt(mpic, i)) {
				vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
					    MPIC_VECPRI_POLARITY_MASK);
				vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
			}
#else
			printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n");
#endif
		}

		DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri,
		    (level != 0));

		/* init hw */
		mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
		mpic_irq_write(i, MPIC_IRQ_DESTINATION,
			       1 << hard_smp_processor_id());

		/* init linux descriptors */
		if (i < mpic->irq_count) {
			irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0;
			irq_desc[mpic->irq_offset+i].handler = &mpic->hc_irq;
		}
	}
	
	/* Init spurrious vector */
	mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS);

	/* Disable 8259 passthrough */
	mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
		   mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
		   | MPIC_GREG_GCONF_8259_PTHROU_DIS);

	/* Set current processor priority to 0 */
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
}

void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
{
	u32 v;

	v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
	v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
	v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
	mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
}

void __init mpic_set_serial_int(struct mpic *mpic, int enable)
{
	u32 v;

	v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
	if (enable)
		v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
	else
		v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
	mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
}

void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
{
	int is_ipi;
	struct mpic *mpic = mpic_find(irq, &is_ipi);
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&mpic_lock, flags);
	if (is_ipi) {
		reg = mpic_ipi_read(irq - mpic->ipi_offset) &
			~MPIC_VECPRI_PRIORITY_MASK;
		mpic_ipi_write(irq - mpic->ipi_offset,
			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
	} else {
		reg = mpic_irq_read(irq - mpic->irq_offset,MPIC_IRQ_VECTOR_PRI)
			& ~MPIC_VECPRI_PRIORITY_MASK;
		mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI,
			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
	}
	spin_unlock_irqrestore(&mpic_lock, flags);
}

unsigned int mpic_irq_get_priority(unsigned int irq)
{
	int is_ipi;
	struct mpic *mpic = mpic_find(irq, &is_ipi);
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&mpic_lock, flags);
	if (is_ipi)
		reg = mpic_ipi_read(irq - mpic->ipi_offset);
	else
		reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI);
	spin_unlock_irqrestore(&mpic_lock, flags);
	return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
}

void mpic_setup_this_cpu(void)
{
#ifdef CONFIG_SMP
	struct mpic *mpic = mpic_primary;
	unsigned long flags;
	u32 msk = 1 << hard_smp_processor_id();
	unsigned int i;

	BUG_ON(mpic == NULL);

	DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());

	spin_lock_irqsave(&mpic_lock, flags);

 	/* let the mpic know we want intrs. default affinity is 0xffffffff
	 * until changed via /proc. That's how it's done on x86. If we want
	 * it differently, then we should make sure we also change the default
	 * values of irq_affinity in irq.c.
 	 */
	if (distribute_irqs) {
	 	for (i = 0; i < mpic->num_sources ; i++)
			mpic_irq_write(i, MPIC_IRQ_DESTINATION,
				mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk);
	}

	/* Set current processor priority to 0 */
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);

	spin_unlock_irqrestore(&mpic_lock, flags);
#endif /* CONFIG_SMP */
}

int mpic_cpu_get_priority(void)
{
	struct mpic *mpic = mpic_primary;

	return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI);
}

void mpic_cpu_set_priority(int prio)
{
	struct mpic *mpic = mpic_primary;

	prio &= MPIC_CPU_TASKPRI_MASK;
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio);
}

/*
 * XXX: someone who knows mpic should check this.
 * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
 * or can we reset the mpic in the new kernel?
 */
void mpic_teardown_this_cpu(int secondary)
{
	struct mpic *mpic = mpic_primary;
	unsigned long flags;
	u32 msk = 1 << hard_smp_processor_id();
	unsigned int i;

	BUG_ON(mpic == NULL);

	DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
	spin_lock_irqsave(&mpic_lock, flags);

	/* let the mpic know we don't want intrs.  */
	for (i = 0; i < mpic->num_sources ; i++)
		mpic_irq_write(i, MPIC_IRQ_DESTINATION,
			mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);

	/* Set current processor priority to max */
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);

	spin_unlock_irqrestore(&mpic_lock, flags);
}


void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
{
	struct mpic *mpic = mpic_primary;

	BUG_ON(mpic == NULL);

#ifdef DEBUG_IPI
	DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
#endif

	mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
		       mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
}

int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
{
	u32 irq;

	irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
#ifdef DEBUG_LOW
	DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
#endif
	if (mpic->cascade && irq == mpic->cascade_vec) {
#ifdef DEBUG_LOW
		DBG("%s: cascading ...\n", mpic->name);
#endif
		irq = mpic->cascade(regs, mpic->cascade_data);
		mpic_eoi(mpic);
		return irq;
	}
	if (unlikely(irq == MPIC_VEC_SPURRIOUS))
		return -1;
	if (irq < MPIC_VEC_IPI_0) {
#ifdef DEBUG_IRQ
		DBG("%s: irq %d\n", mpic->name, irq + mpic->irq_offset);
#endif
		return irq + mpic->irq_offset;
	}
#ifdef DEBUG_IPI
       	DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
#endif
	return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
}

int mpic_get_irq(struct pt_regs *regs)
{
	struct mpic *mpic = mpic_primary;

	BUG_ON(mpic == NULL);

	return mpic_get_one_irq(mpic, regs);
}


#ifdef CONFIG_SMP
void mpic_request_ipis(void)
{
	struct mpic *mpic = mpic_primary;

	BUG_ON(mpic == NULL);
	
	printk("requesting IPIs ... \n");

	/* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */
	request_irq(mpic->ipi_offset+0, mpic_ipi_action, SA_INTERRUPT,
		    "IPI0 (call function)", mpic);
	request_irq(mpic->ipi_offset+1, mpic_ipi_action, SA_INTERRUPT,
		   "IPI1 (reschedule)", mpic);
	request_irq(mpic->ipi_offset+2, mpic_ipi_action, SA_INTERRUPT,
		   "IPI2 (unused)", mpic);
	request_irq(mpic->ipi_offset+3, mpic_ipi_action, SA_INTERRUPT,
		   "IPI3 (debugger break)", mpic);

	printk("IPIs requested... \n");
}

void smp_mpic_message_pass(int target, int msg)
{
	/* make sure we're sending something that translates to an IPI */
	if ((unsigned int)msg > 3) {
		printk("SMP %d: smp_message_pass: unknown msg %d\n",
		       smp_processor_id(), msg);
		return;
	}
	switch (target) {
	case MSG_ALL:
		mpic_send_ipi(msg, 0xffffffff);
		break;
	case MSG_ALL_BUT_SELF:
		mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
		break;
	default:
		mpic_send_ipi(msg, 1 << target);
		break;
	}
}
#endif /* CONFIG_SMP */