summaryrefslogtreecommitdiffstats
path: root/arch/ppc64/kernel/pmac_pci.c
blob: 71fe911ad1839c265c1a36ae4a409a7a278ab572 (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
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
/*
 * Support for PCI bridges found on Power Macintoshes.
 * At present the "bandit" and "chaos" bridges are supported.
 * Fortunately you access configuration space in the same
 * way with either bridge.
 *
 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
 *
 * 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/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/iommu.h>

#include "pci.h"
#include "pmac.h"

#define DEBUG

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

/* XXX Could be per-controller, but I don't think we risk anything by
 * assuming we won't have both UniNorth and Bandit */
static int has_uninorth;
static struct pci_controller *u3_agp;
struct device_node *k2_skiplist[2];

static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
{
	for (; node != 0;node = node->sibling) {
		int * bus_range;
		unsigned int *class_code;
		int len;

		/* For PCI<->PCI bridges or CardBus bridges, we go down */
		class_code = (unsigned int *) get_property(node, "class-code", NULL);
		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
			continue;
		bus_range = (int *) get_property(node, "bus-range", &len);
		if (bus_range != NULL && len > 2 * sizeof(int)) {
			if (bus_range[1] > higher)
				higher = bus_range[1];
		}
		higher = fixup_one_level_bus_range(node->child, higher);
	}
	return higher;
}

/* This routine fixes the "bus-range" property of all bridges in the
 * system since they tend to have their "last" member wrong on macs
 *
 * Note that the bus numbers manipulated here are OF bus numbers, they
 * are not Linux bus numbers.
 */
static void __init fixup_bus_range(struct device_node *bridge)
{
	int * bus_range;
	int len;

	/* Lookup the "bus-range" property for the hose */
	bus_range = (int *) get_property(bridge, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		printk(KERN_WARNING "Can't get bus-range for %s\n",
			       bridge->full_name);
		return;
	}
	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
}

/*
 * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
 *
 * The "Bandit" version is present in all early PCI PowerMacs,
 * and up to the first ones using Grackle. Some machines may
 * have 2 bandit controllers (2 PCI busses).
 *
 * "Chaos" is used in some "Bandit"-type machines as a bridge
 * for the separate display bus. It is accessed the same
 * way as bandit, but cannot be probed for devices. It therefore
 * has its own config access functions.
 *
 * The "UniNorth" version is present in all Core99 machines
 * (iBook, G4, new IMacs, and all the recent Apple machines).
 * It contains 3 controllers in one ASIC.
 *
 * The U3 is the bridge used on G5 machines. It contains on
 * AGP bus which is dealt with the old UniNorth access routines
 * and an HyperTransport bus which uses its own set of access
 * functions.
 */

#define MACRISC_CFA0(devfn, off)	\
	((1 << (unsigned long)PCI_SLOT(dev_fn)) \
	| (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
	| (((unsigned long)(off)) & 0xFCUL))

#define MACRISC_CFA1(bus, devfn, off)	\
	((((unsigned long)(bus)) << 16) \
	|(((unsigned long)(devfn)) << 8) \
	|(((unsigned long)(off)) & 0xFCUL) \
	|1UL)

static unsigned long __pmac macrisc_cfg_access(struct pci_controller* hose,
					       u8 bus, u8 dev_fn, u8 offset)
{
	unsigned int caddr;

	if (bus == hose->first_busno) {
		if (dev_fn < (11 << 3))
			return 0;
		caddr = MACRISC_CFA0(dev_fn, offset);
	} else
		caddr = MACRISC_CFA1(bus, dev_fn, offset);

	/* Uninorth will return garbage if we don't read back the value ! */
	do {
		out_le32(hose->cfg_addr, caddr);
	} while (in_le32(hose->cfg_addr) != caddr);

	offset &= has_uninorth ? 0x07 : 0x03;
	return ((unsigned long)hose->cfg_data) + offset;
}

static int __pmac macrisc_read_config(struct pci_bus *bus, unsigned int devfn,
				      int offset, int len, u32 *val)
{
	struct pci_controller *hose;
	unsigned long addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
		return PCIBIOS_DEVICE_NOT_FOUND;

	addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
		return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	 * Note: the caller has already checked that offset is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	switch (len) {
	case 1:
		*val = in_8((u8 *)addr);
		break;
	case 2:
		*val = in_le16((u16 *)addr);
		break;
	default:
		*val = in_le32((u32 *)addr);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

static int __pmac macrisc_write_config(struct pci_bus *bus, unsigned int devfn,
				       int offset, int len, u32 val)
{
	struct pci_controller *hose;
	unsigned long addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
		return PCIBIOS_DEVICE_NOT_FOUND;

	addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
		return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	 * Note: the caller has already checked that offset is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	switch (len) {
	case 1:
		out_8((u8 *)addr, val);
		(void) in_8((u8 *)addr);
		break;
	case 2:
		out_le16((u16 *)addr, val);
		(void) in_le16((u16 *)addr);
		break;
	default:
		out_le32((u32 *)addr, val);
		(void) in_le32((u32 *)addr);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops macrisc_pci_ops =
{
	macrisc_read_config,
	macrisc_write_config
};

/*
 * These versions of U3 HyperTransport config space access ops do not
 * implement self-view of the HT host yet
 */

/*
 * This function deals with some "special cases" devices.
 *
 *  0 -> No special case
 *  1 -> Skip the device but act as if the access was successfull
 *       (return 0xff's on reads, eventually, cache config space
 *       accesses in a later version)
 * -1 -> Hide the device (unsuccessful acess)
 */
static int u3_ht_skip_device(struct pci_controller *hose,
			     struct pci_bus *bus, unsigned int devfn)
{
	struct device_node *busdn, *dn;
	int i;

	/* We only allow config cycles to devices that are in OF device-tree
	 * as we are apparently having some weird things going on with some
	 * revs of K2 on recent G5s
	 */
	if (bus->self)
		busdn = pci_device_to_OF_node(bus->self);
	else
		busdn = hose->arch_data;
	for (dn = busdn->child; dn; dn = dn->sibling)
		if (dn->devfn == devfn)
			break;
	if (dn == NULL)
		return -1;

	/*
	 * When a device in K2 is powered down, we die on config
	 * cycle accesses. Fix that here.
	 */
	for (i=0; i<2; i++)
		if (k2_skiplist[i] == dn)
			return 1;

	return 0;
}

#define U3_HT_CFA0(devfn, off)		\
		((((unsigned long)devfn) << 8) | offset)
#define U3_HT_CFA1(bus, devfn, off)	\
		(U3_HT_CFA0(devfn, off) \
		+ (((unsigned long)bus) << 16) \
		+ 0x01000000UL)

static unsigned long __pmac u3_ht_cfg_access(struct pci_controller* hose,
					     u8 bus, u8 devfn, u8 offset)
{
	if (bus == hose->first_busno) {
		/* For now, we don't self probe U3 HT bridge */
		if (PCI_SLOT(devfn) == 0)
			return 0;
		return ((unsigned long)hose->cfg_data) + U3_HT_CFA0(devfn, offset);
	} else
		return ((unsigned long)hose->cfg_data) + U3_HT_CFA1(bus, devfn, offset);
}

static int __pmac u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
				    int offset, int len, u32 *val)
{
	struct pci_controller *hose;
	unsigned long addr;


	hose = pci_bus_to_host(bus);      
	if (hose == NULL)
		return PCIBIOS_DEVICE_NOT_FOUND;

	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
		return PCIBIOS_DEVICE_NOT_FOUND;

	switch (u3_ht_skip_device(hose, bus, devfn)) {
	case 0:
		break;
	case 1:
		switch (len) {
		case 1:
			*val = 0xff; break;
		case 2:
			*val = 0xffff; break;
		default:
			*val = 0xfffffffful; break;
		}
		return PCIBIOS_SUCCESSFUL;
	default:
		return PCIBIOS_DEVICE_NOT_FOUND;
	}

	/*
	 * Note: the caller has already checked that offset is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	switch (len) {
	case 1:
		*val = in_8((u8 *)addr);
		break;
	case 2:
		*val = in_le16((u16 *)addr);
		break;
	default:
		*val = in_le32((u32 *)addr);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

static int __pmac u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
				     int offset, int len, u32 val)
{
	struct pci_controller *hose;
	unsigned long addr;

	hose = pci_bus_to_host(bus);
	if (hose == NULL)
		return PCIBIOS_DEVICE_NOT_FOUND;

	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
	if (!addr)
		return PCIBIOS_DEVICE_NOT_FOUND;

	switch (u3_ht_skip_device(hose, bus, devfn)) {
	case 0:
		break;
	case 1:
		return PCIBIOS_SUCCESSFUL;
	default:
		return PCIBIOS_DEVICE_NOT_FOUND;
	}

	/*
	 * Note: the caller has already checked that offset is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	switch (len) {
	case 1:
		out_8((u8 *)addr, val);
		(void) in_8((u8 *)addr);
		break;
	case 2:
		out_le16((u16 *)addr, val);
		(void) in_le16((u16 *)addr);
		break;
	default:
		out_le32((u32 *)addr, val);
		(void) in_le32((u32 *)addr);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops u3_ht_pci_ops =
{
	u3_ht_read_config,
	u3_ht_write_config
};

static void __init setup_u3_agp(struct pci_controller* hose)
{
	/* On G5, we move AGP up to high bus number so we don't need
	 * to reassign bus numbers for HT. If we ever have P2P bridges
	 * on AGP, we'll have to move pci_assign_all_busses to the
	 * pci_controller structure so we enable it for AGP and not for
	 * HT childs.
	 * We hard code the address because of the different size of
	 * the reg address cell, we shall fix that by killing struct
	 * reg_property and using some accessor functions instead
	 */
       	hose->first_busno = 0xf0;
	hose->last_busno = 0xff;
	has_uninorth = 1;
	hose->ops = &macrisc_pci_ops;
	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

	u3_agp = hose;
}

static void __init setup_u3_ht(struct pci_controller* hose)
{
	struct device_node *np = (struct device_node *)hose->arch_data;
	int i, cur;

	hose->ops = &u3_ht_pci_ops;

	/* We hard code the address because of the different size of
	 * the reg address cell, we shall fix that by killing struct
	 * reg_property and using some accessor functions instead
	 */
	hose->cfg_data = (volatile unsigned char *)ioremap(0xf2000000, 0x02000000);

	/*
	 * /ht node doesn't expose a "ranges" property, so we "remove" regions that
	 * have been allocated to AGP. So far, this version of the code doesn't assign
	 * any of the 0xfxxxxxxx "fine" memory regions to /ht.
	 * We need to fix that sooner or later by either parsing all child "ranges"
	 * properties or figuring out the U3 address space decoding logic and
	 * then read it's configuration register (if any).
	 */
	hose->io_base_phys = 0xf4000000;
	hose->io_base_virt = ioremap(hose->io_base_phys, 0x00400000);
	isa_io_base = pci_io_base = (unsigned long) hose->io_base_virt;
	hose->io_resource.name = np->full_name;
	hose->io_resource.start = 0;
	hose->io_resource.end = 0x003fffff;
	hose->io_resource.flags = IORESOURCE_IO;
	hose->pci_mem_offset = 0;
	hose->first_busno = 0;
	hose->last_busno = 0xef;
	hose->mem_resources[0].name = np->full_name;
	hose->mem_resources[0].start = 0x80000000;
	hose->mem_resources[0].end = 0xefffffff;
	hose->mem_resources[0].flags = IORESOURCE_MEM;

	if (u3_agp == NULL) {
		DBG("U3 has no AGP, using full resource range\n");
		return;
	}

	/* We "remove" the AGP resources from the resources allocated to HT, that
	 * is we create "holes". However, that code does assumptions that so far
	 * happen to be true (cross fingers...), typically that resources in the
	 * AGP node are properly ordered
	 */
	cur = 0;
	for (i=0; i<3; i++) {
		struct resource *res = &u3_agp->mem_resources[i];
		if (res->flags != IORESOURCE_MEM)
			continue;
		/* We don't care about "fine" resources */
		if (res->start >= 0xf0000000)
			continue;
		/* Check if it's just a matter of "shrinking" us in one direction */
		if (hose->mem_resources[cur].start == res->start) {
			DBG("U3/HT: shrink start of %d, %08lx -> %08lx\n",
			    cur, hose->mem_resources[cur].start, res->end + 1);
			hose->mem_resources[cur].start = res->end + 1;
			continue;
		}
		if (hose->mem_resources[cur].end == res->end) {
			DBG("U3/HT: shrink end of %d, %08lx -> %08lx\n",
			    cur, hose->mem_resources[cur].end, res->start - 1);
			hose->mem_resources[cur].end = res->start - 1;
			continue;
		}
		/* No, it's not the case, we need a hole */
		if (cur == 2) {
			/* not enough resources for a hole, we drop part of the range */
			printk(KERN_WARNING "Running out of resources for /ht host !\n");
			hose->mem_resources[cur].end = res->start - 1;
			continue;
		}		
		cur++;
       		DBG("U3/HT: hole, %d end at %08lx, %d start at %08lx\n",
		    cur-1, res->start - 1, cur, res->end + 1);
		hose->mem_resources[cur].name = np->full_name;
		hose->mem_resources[cur].flags = IORESOURCE_MEM;
		hose->mem_resources[cur].start = res->end + 1;
		hose->mem_resources[cur].end = hose->mem_resources[cur-1].end;
		hose->mem_resources[cur-1].end = res->start - 1;
	}
}

static void __init pmac_process_bridge_OF_ranges(struct pci_controller *hose,
			   struct device_node *dev, int primary)
{
	static unsigned int static_lc_ranges[2024];
	unsigned int *dt_ranges, *lc_ranges, *ranges, *prev;
	unsigned int size;
	int rlen = 0, orig_rlen;
	int memno = 0;
	struct resource *res;
	int np, na = prom_n_addr_cells(dev);

	np = na + 5;

	/* First we try to merge ranges to fix a problem with some pmacs
	 * that can have more than 3 ranges, fortunately using contiguous
	 * addresses -- BenH
	 */
	dt_ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
	if (!dt_ranges)
		return;
	/*	lc_ranges = alloc_bootmem(rlen);*/
	lc_ranges = static_lc_ranges;
	if (!lc_ranges)
		return; /* what can we do here ? */
	memcpy(lc_ranges, dt_ranges, rlen);
	orig_rlen = rlen;

	/* Let's work on a copy of the "ranges" property instead of damaging
	 * the device-tree image in memory
	 */
	ranges = lc_ranges;
	prev = NULL;
	while ((rlen -= np * sizeof(unsigned int)) >= 0) {
		if (prev) {
			if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
				(prev[2] + prev[na+4]) == ranges[2] &&
				(prev[na+2] + prev[na+4]) == ranges[na+2]) {
				prev[na+4] += ranges[na+4];
				ranges[0] = 0;
				ranges += np;
				continue;
			}
		}
		prev = ranges;
		ranges += np;
	}

	/*
	 * The ranges property is laid out as an array of elements,
	 * each of which comprises:
	 *   cells 0 - 2:	a PCI address
	 *   cells 3 or 3+4:	a CPU physical address
	 *			(size depending on dev->n_addr_cells)
	 *   cells 4+5 or 5+6:	the size of the range
	 */
	ranges = lc_ranges;
	rlen = orig_rlen;
	while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
		res = NULL;
		size = ranges[na+4];
		switch (ranges[0] >> 24) {
		case 1:		/* I/O space */
			if (ranges[2] != 0)
				break;
			hose->io_base_phys = ranges[na+2];
			/* limit I/O space to 16MB */
			if (size > 0x01000000)
				size = 0x01000000;
			hose->io_base_virt = ioremap(ranges[na+2], size);
			if (primary)
				isa_io_base = (unsigned long) hose->io_base_virt;
			res = &hose->io_resource;
			res->flags = IORESOURCE_IO;
			res->start = ranges[2];
			break;
		case 2:		/* memory space */
			memno = 0;
			if (ranges[1] == 0 && ranges[2] == 0
			    && ranges[na+4] <= (16 << 20)) {
				/* 1st 16MB, i.e. ISA memory area */
#if 0
				if (primary)
					isa_mem_base = ranges[na+2];
#endif
				memno = 1;
			}
			while (memno < 3 && hose->mem_resources[memno].flags)
				++memno;
			if (memno == 0)
				hose->pci_mem_offset = ranges[na+2] - ranges[2];
			if (memno < 3) {
				res = &hose->mem_resources[memno];
				res->flags = IORESOURCE_MEM;
				res->start = ranges[na+2];
			}
			break;
		}
		if (res != NULL) {
			res->name = dev->full_name;
			res->end = res->start + size - 1;
			res->parent = NULL;
			res->sibling = NULL;
			res->child = NULL;
		}
		ranges += np;
	}
}

/*
 * We assume that if we have a G3 powermac, we have one bridge called
 * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
 * if we have one or more bandit or chaos bridges, we don't have a MPC106.
 */
static int __init add_bridge(struct device_node *dev)
{
	int len;
	struct pci_controller *hose;
	char* disp_name;
	int *bus_range;
	int primary = 1;
 	struct property *of_prop;

	DBG("Adding PCI host bridge %s\n", dev->full_name);

       	bus_range = (int *) get_property(dev, "bus-range", &len);
       	if (bus_range == NULL || len < 2 * sizeof(int)) {
       		printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
       			       dev->full_name);
       	}

	hose = alloc_bootmem(sizeof(struct pci_controller));
	if (hose == NULL)
		return -ENOMEM;
       	pci_setup_pci_controller(hose);

       	hose->arch_data = dev;
       	hose->first_busno = bus_range ? bus_range[0] : 0;
       	hose->last_busno = bus_range ? bus_range[1] : 0xff;

	of_prop = alloc_bootmem(sizeof(struct property) +
				sizeof(hose->global_number));
	if (of_prop) {
		memset(of_prop, 0, sizeof(struct property));
		of_prop->name = "linux,pci-domain";
		of_prop->length = sizeof(hose->global_number);
		of_prop->value = (unsigned char *)&of_prop[1];
		memcpy(of_prop->value, &hose->global_number, sizeof(hose->global_number));
		prom_add_property(dev, of_prop);
	}

	disp_name = NULL;
       	if (device_is_compatible(dev, "u3-agp")) {
       		setup_u3_agp(hose);
       		disp_name = "U3-AGP";
       		primary = 0;
       	} else if (device_is_compatible(dev, "u3-ht")) {
       		setup_u3_ht(hose);
       		disp_name = "U3-HT";
       		primary = 1;
       	}
       	printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
       		disp_name, hose->first_busno, hose->last_busno);

       	/* Interpret the "ranges" property */
       	/* This also maps the I/O region and sets isa_io/mem_base */
       	pmac_process_bridge_OF_ranges(hose, dev, primary);

       	/* Fixup "bus-range" OF property */
       	fixup_bus_range(dev);

	return 0;
}

/*
 * We use our own read_irq_line here because PCI_INTERRUPT_PIN is
 * crap on some of Apple ASICs. We unconditionally use the Open Firmware
 * interrupt number as this is always right.
 */
static int pmac_pci_read_irq_line(struct pci_dev *pci_dev)
{
	struct device_node *node;

	node = pci_device_to_OF_node(pci_dev);
	if (node == NULL)
		return -1;
	if (node->n_intrs == 0)
		return -1;
	pci_dev->irq = node->intrs[0].line;
	pci_write_config_byte(pci_dev, PCI_INTERRUPT_LINE, pci_dev->irq);

	return 0;
}

void __init pmac_pcibios_fixup(void)
{
	struct pci_dev *dev = NULL;

	for_each_pci_dev(dev)
		pmac_pci_read_irq_line(dev);
}

static void __init pmac_fixup_phb_resources(void)
{
	struct pci_controller *hose, *tmp;
	
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
		hose->io_resource.start += offset;
		hose->io_resource.end += offset;
		printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
		       hose->global_number,
		       hose->io_resource.start, hose->io_resource.end);
	}
}

void __init pmac_pci_init(void)
{
	struct device_node *np, *root;
	struct device_node *ht = NULL;

	/* Probe root PCI hosts, that is on U3 the AGP host and the
	 * HyperTransport host. That one is actually "kept" around
	 * and actually added last as it's resource management relies
	 * on the AGP resources to have been setup first
	 */
	root = of_find_node_by_path("/");
	if (root == NULL) {
		printk(KERN_CRIT "pmac_find_bridges: can't find root of device tree\n");
		return;
	}
	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
		if (np->name == NULL)
			continue;
		if (strcmp(np->name, "pci") == 0) {
			if (add_bridge(np) == 0)
				of_node_get(np);
		}
		if (strcmp(np->name, "ht") == 0) {
			of_node_get(np);
			ht = np;
		}
	}
	of_node_put(root);

	/* Now setup the HyperTransport host if we found any
	 */
	if (ht && add_bridge(ht) != 0)
		of_node_put(ht);

	/* Fixup the IO resources on our host bridges as the common code
	 * does it only for childs of the host bridges
	 */
	pmac_fixup_phb_resources();

	/* Setup the linkage between OF nodes and PHBs */ 
	pci_devs_phb_init();

	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
	 * assume there is no P2P bridge on the AGP bus, which should be a
	 * safe assumptions hopefully.
	 */
	if (u3_agp) {
		struct device_node *np = u3_agp->arch_data;
		np->busno = 0xf0;
		for (np = np->child; np; np = np->sibling)
			np->busno = 0xf0;
	}

	pmac_check_ht_link();

	/* Tell pci.c to not use the common resource allocation mecanism */
	pci_probe_only = 1;
	
	/* Allow all IO */
	io_page_mask = -1;
}

/*
 * Disable second function on K2-SATA, it's broken
 * and disable IO BARs on first one
 */
static void fixup_k2_sata(struct pci_dev* dev)
{
	int i;
	u16 cmd;

	if (PCI_FUNC(dev->devfn) > 0) {
		pci_read_config_word(dev, PCI_COMMAND, &cmd);
		cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
		pci_write_config_word(dev, PCI_COMMAND, cmd);
		for (i = 0; i < 6; i++) {
			dev->resource[i].start = dev->resource[i].end = 0;
			dev->resource[i].flags = 0;
			pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
		}
	} else {
		pci_read_config_word(dev, PCI_COMMAND, &cmd);
		cmd &= ~PCI_COMMAND_IO;
		pci_write_config_word(dev, PCI_COMMAND, cmd);
		for (i = 0; i < 5; i++) {
			dev->resource[i].start = dev->resource[i].end = 0;
			dev->resource[i].flags = 0;
			pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
		}
	}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);

OpenPOWER on IntegriCloud