aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc64/kernel/pmac_feature.c
blob: 26075f11db77caa63ec73eef2c2cc8e293be5978 (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
/*
 *  arch/ppc/platforms/pmac_feature.c
 *
 *  Copyright (C) 1996-2001 Paul Mackerras (paulus@cs.anu.edu.au)
 *                          Ben. Herrenschmidt (benh@kernel.crashing.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.
 *
 *  TODO:
 *
 *   - Replace mdelay with some schedule loop if possible
 *   - Shorten some obfuscated delays on some routines (like modem
 *     power)
 *   - Refcount some clocks (see darwin)
 *   - Split split split...
 *
 */
#include <linux/config.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <asm/sections.h>
#include <asm/errno.h>
#include <asm/keylargo.h>
#include <asm/uninorth.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>
#include <asm/pci-bridge.h>
#include <asm/pmac_low_i2c.h>

#undef DEBUG_FEATURE

#ifdef DEBUG_FEATURE
#define DBG(fmt...) printk(KERN_DEBUG fmt)
#else
#define DBG(fmt...)
#endif

/*
 * We use a single global lock to protect accesses. Each driver has
 * to take care of its own locking
 */
static DEFINE_SPINLOCK(feature_lock);

#define LOCK(flags)	spin_lock_irqsave(&feature_lock, flags);
#define UNLOCK(flags)	spin_unlock_irqrestore(&feature_lock, flags);


/*
 * Instance of some macio stuffs
 */
struct macio_chip macio_chips[MAX_MACIO_CHIPS] ;

struct macio_chip* macio_find(struct device_node* child, int type)
{
	while(child) {
		int	i;

		for (i=0; i < MAX_MACIO_CHIPS && macio_chips[i].of_node; i++)
			if (child == macio_chips[i].of_node &&
			    (!type || macio_chips[i].type == type))
				return &macio_chips[i];
		child = child->parent;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(macio_find);

static const char* macio_names[] =
{
	"Unknown",
	"Grand Central",
	"OHare",
	"OHareII",
	"Heathrow",
	"Gatwick",
	"Paddington",
	"Keylargo",
	"Pangea",
	"Intrepid",
	"K2"
};



/*
 * Uninorth reg. access. Note that Uni-N regs are big endian
 */

#define UN_REG(r)	(uninorth_base + ((r) >> 2))
#define UN_IN(r)	(in_be32(UN_REG(r)))
#define UN_OUT(r,v)	(out_be32(UN_REG(r), (v)))
#define UN_BIS(r,v)	(UN_OUT((r), UN_IN(r) | (v)))
#define UN_BIC(r,v)	(UN_OUT((r), UN_IN(r) & ~(v)))

static struct device_node* uninorth_node;
static u32* uninorth_base;
static u32 uninorth_rev;
static void *u3_ht;

extern struct device_node *k2_skiplist[2];

/*
 * For each motherboard family, we have a table of functions pointers
 * that handle the various features.
 */

typedef long (*feature_call)(struct device_node* node, long param, long value);

struct feature_table_entry {
	unsigned int	selector;
	feature_call	function;
};

struct pmac_mb_def
{
	const char*			model_string;
	const char*			model_name;
	int				model_id;
	struct feature_table_entry* 	features;
	unsigned long			board_flags;
};
static struct pmac_mb_def pmac_mb;

/*
 * Here are the chip specific feature functions
 */


static long g5_read_gpio(struct device_node* node, long param, long value)
{
	struct macio_chip* macio = &macio_chips[0];

	return MACIO_IN8(param);
}


static long g5_write_gpio(struct device_node* node, long param, long value)
{
	struct macio_chip* macio = &macio_chips[0];

	MACIO_OUT8(param, (u8)(value & 0xff));
	return 0;
}

static long g5_gmac_enable(struct device_node* node, long param, long value)
{
	struct macio_chip* macio = &macio_chips[0];
	unsigned long flags;

	if (node == NULL)
		return -ENODEV;

	LOCK(flags);
	if (value) {
		MACIO_BIS(KEYLARGO_FCR1, K2_FCR1_GMAC_CLK_ENABLE);
		mb();
		k2_skiplist[0] = NULL;
	} else {
		k2_skiplist[0] = node;
		mb();
		MACIO_BIC(KEYLARGO_FCR1, K2_FCR1_GMAC_CLK_ENABLE);
	}
	
	UNLOCK(flags);
	mdelay(1);

	return 0;
}

static long g5_fw_enable(struct device_node* node, long param, long value)
{
	struct macio_chip* macio = &macio_chips[0];
	unsigned long flags;

	if (node == NULL)
		return -ENODEV;

	LOCK(flags);
	if (value) {
		MACIO_BIS(KEYLARGO_FCR1, K2_FCR1_FW_CLK_ENABLE);
		mb();
		k2_skiplist[1] = NULL;
	} else {
		k2_skiplist[1] = node;
		mb();
		MACIO_BIC(KEYLARGO_FCR1, K2_FCR1_FW_CLK_ENABLE);
	}
	
	UNLOCK(flags);
	mdelay(1);

	return 0;
}

static long g5_mpic_enable(struct device_node* node, long param, long value)
{
	unsigned long flags;

	if (node->parent == NULL || strcmp(node->parent->name, "u3"))
		return 0;

	LOCK(flags);
	UN_BIS(U3_TOGGLE_REG, U3_MPIC_RESET | U3_MPIC_OUTPUT_ENABLE);
	UNLOCK(flags);

	return 0;
}

static long g5_eth_phy_reset(struct device_node* node, long param, long value)
{
	struct macio_chip* macio = &macio_chips[0];
	struct device_node *phy;
	int need_reset;

	/*
	 * We must not reset the combo PHYs, only the BCM5221 found in
	 * the iMac G5.
	 */
	phy = of_get_next_child(node, NULL);
	if (!phy)
		return -ENODEV;
	need_reset = device_is_compatible(phy, "B5221");
	of_node_put(phy);
	if (!need_reset)
		return 0;

	/* PHY reset is GPIO 29, not in device-tree unfortunately */
	MACIO_OUT8(K2_GPIO_EXTINT_0 + 29,
		   KEYLARGO_GPIO_OUTPUT_ENABLE | KEYLARGO_GPIO_OUTOUT_DATA);
	/* Thankfully, this is now always called at a time when we can
	 * schedule by sungem.
	 */
	msleep(10);
	MACIO_OUT8(K2_GPIO_EXTINT_0 + 29, 0);

	return 0;
}

static long g5_i2s_enable(struct device_node *node, long param, long value)
{
	/* Very crude implementation for now */
	struct macio_chip* macio = &macio_chips[0];
	unsigned long flags;

	if (value == 0)
		return 0; /* don't disable yet */

	LOCK(flags);
	MACIO_BIS(KEYLARGO_FCR3, KL3_CLK45_ENABLE | KL3_CLK49_ENABLE |
		  KL3_I2S0_CLK18_ENABLE);
	udelay(10);
	MACIO_BIS(KEYLARGO_FCR1, K2_FCR1_I2S0_CELL_ENABLE |
		  K2_FCR1_I2S0_CLK_ENABLE_BIT | K2_FCR1_I2S0_ENABLE);
	udelay(10);
	MACIO_BIC(KEYLARGO_FCR1, K2_FCR1_I2S0_RESET);
	UNLOCK(flags);
	udelay(10);

	return 0;
}


#ifdef CONFIG_SMP
static long g5_reset_cpu(struct device_node* node, long param, long value)
{
	unsigned int reset_io = 0;
	unsigned long flags;
	struct macio_chip* macio;
	struct device_node* np;

	macio = &macio_chips[0];
	if (macio->type != macio_keylargo2)
		return -ENODEV;

	np = find_path_device("/cpus");
	if (np == NULL)
		return -ENODEV;
	for (np = np->child; np != NULL; np = np->sibling) {
		u32* num = (u32 *)get_property(np, "reg", NULL);
		u32* rst = (u32 *)get_property(np, "soft-reset", NULL);
		if (num == NULL || rst == NULL)
			continue;
		if (param == *num) {
			reset_io = *rst;
			break;
		}
	}
	if (np == NULL || reset_io == 0)
		return -ENODEV;

	LOCK(flags);
	MACIO_OUT8(reset_io, KEYLARGO_GPIO_OUTPUT_ENABLE);
	(void)MACIO_IN8(reset_io);
	udelay(1);
	MACIO_OUT8(reset_io, 0);
	(void)MACIO_IN8(reset_io);
	UNLOCK(flags);

	return 0;
}
#endif /* CONFIG_SMP */

/*
 * This can be called from pmac_smp so isn't static
 *
 * This takes the second CPU off the bus on dual CPU machines
 * running UP
 */
void g5_phy_disable_cpu1(void)
{
	UN_OUT(U3_API_PHY_CONFIG_1, 0);
}

static long generic_get_mb_info(struct device_node* node, long param, long value)
{
	switch(param) {
		case PMAC_MB_INFO_MODEL:
			return pmac_mb.model_id;
		case PMAC_MB_INFO_FLAGS:
			return pmac_mb.board_flags;
		case PMAC_MB_INFO_NAME:			
			/* hack hack hack... but should work */
			*((const char **)value) = pmac_mb.model_name;
			return 0;
	}
	return -EINVAL;
}


/*
 * Table definitions
 */

/* Used on any machine
 */
static struct feature_table_entry any_features[] = {
	{ PMAC_FTR_GET_MB_INFO,		generic_get_mb_info },
	{ 0, NULL }
};

/* G5 features
 */
static struct feature_table_entry g5_features[] = {
	{ PMAC_FTR_GMAC_ENABLE,		g5_gmac_enable },
	{ PMAC_FTR_1394_ENABLE,		g5_fw_enable },
	{ PMAC_FTR_ENABLE_MPIC,		g5_mpic_enable },
	{ PMAC_FTR_READ_GPIO,		g5_read_gpio },
	{ PMAC_FTR_WRITE_GPIO,		g5_write_gpio },
	{ PMAC_FTR_GMAC_PHY_RESET,	g5_eth_phy_reset },
	{ PMAC_FTR_SOUND_CHIP_ENABLE,	g5_i2s_enable },
#ifdef CONFIG_SMP
	{ PMAC_FTR_RESET_CPU,		g5_reset_cpu },
#endif /* CONFIG_SMP */
	{ 0, NULL }
};

static struct pmac_mb_def pmac_mb_defs[] = {
	{	"PowerMac7,2",			"PowerMac G5",
		PMAC_TYPE_POWERMAC_G5,		g5_features,
		0,
	},
	{	"PowerMac7,3",			"PowerMac G5",
		PMAC_TYPE_POWERMAC_G5,		g5_features,
		0,
	},
	{	"PowerMac8,1",			"iMac G5",
		PMAC_TYPE_IMAC_G5,		g5_features,
		0,
	},
	{	"PowerMac9,1",			"PowerMac G5",
		PMAC_TYPE_POWERMAC_G5_U3L,	g5_features,
		0,
	},
	{       "RackMac3,1",                   "XServe G5",
		PMAC_TYPE_XSERVE_G5,		g5_features,
		0,
	},
};

/*
 * The toplevel feature_call callback
 */
long pmac_do_feature_call(unsigned int selector, ...)
{
	struct device_node* node;
	long param, value;
	int i;
	feature_call func = NULL;
	va_list args;

	if (pmac_mb.features)
		for (i=0; pmac_mb.features[i].function; i++)
			if (pmac_mb.features[i].selector == selector) {
				func = pmac_mb.features[i].function;
				break;
			}
	if (!func)
		for (i=0; any_features[i].function; i++)
			if (any_features[i].selector == selector) {
				func = any_features[i].function;
				break;
			}
	if (!func)
		return -ENODEV;

	va_start(args, selector);
	node = (struct device_node*)va_arg(args, void*);
	param = va_arg(args, long);
	value = va_arg(args, long);
	va_end(args);

	return func(node, param, value);
}

static int __init probe_motherboard(void)
{
	int i;
	struct macio_chip* macio = &macio_chips[0];
	const char* model = NULL;
	struct device_node *dt;

	/* Lookup known motherboard type in device-tree. First try an
	 * exact match on the "model" property, then try a "compatible"
	 * match is none is found.
	 */
	dt = find_devices("device-tree");
	if (dt != NULL)
		model = (const char *) get_property(dt, "model", NULL);
	for(i=0; model && i<(sizeof(pmac_mb_defs)/sizeof(struct pmac_mb_def)); i++) {
	    if (strcmp(model, pmac_mb_defs[i].model_string) == 0) {
		pmac_mb = pmac_mb_defs[i];
		goto found;
	    }
	}
	for(i=0; i<(sizeof(pmac_mb_defs)/sizeof(struct pmac_mb_def)); i++) {
	    if (machine_is_compatible(pmac_mb_defs[i].model_string)) {
		pmac_mb = pmac_mb_defs[i];
		goto found;
	    }
	}

	/* Fallback to selection depending on mac-io chip type */
	switch(macio->type) {
	case macio_keylargo2:
		pmac_mb.model_id = PMAC_TYPE_UNKNOWN_K2;
		pmac_mb.model_name = "Unknown K2-based";
	    	pmac_mb.features = g5_features;
		
	default:
	    	return -ENODEV;
	}
found:
	/* Check for "mobile" machine */
	if (model && (strncmp(model, "PowerBook", 9) == 0
		   || strncmp(model, "iBook", 5) == 0))
		pmac_mb.board_flags |= PMAC_MB_MOBILE;


	printk(KERN_INFO "PowerMac motherboard: %s\n", pmac_mb.model_name);
	return 0;
}

/* Initialize the Core99 UniNorth host bridge and memory controller
 */
static void __init probe_uninorth(void)
{
	uninorth_node = of_find_node_by_name(NULL, "u3");
	if (uninorth_node && uninorth_node->n_addrs > 0) {
		/* Small hack until I figure out if parsing in prom.c is correct. I should
		 * get rid of those pre-parsed junk anyway
		 */
		unsigned long address = uninorth_node->addrs[0].address;
		uninorth_base = ioremap(address, 0x40000);
		uninorth_rev = in_be32(UN_REG(UNI_N_VERSION));
		u3_ht = ioremap(address + U3_HT_CONFIG_BASE, 0x1000);
	} else
		uninorth_node = NULL;

	if (!uninorth_node)
		return;

	printk(KERN_INFO "Found U3 memory controller & host bridge, revision: %d\n",
	       uninorth_rev);
	printk(KERN_INFO "Mapped at 0x%08lx\n", (unsigned long)uninorth_base);

}

static void __init probe_one_macio(const char* name, const char* compat, int type)
{
	struct device_node*	node;
	int			i;
	volatile u32*		base;
	u32*			revp;

	node = find_devices(name);
	if (!node || !node->n_addrs)
		return;
	if (compat)
		do {
			if (device_is_compatible(node, compat))
				break;
			node = node->next;
		} while (node);
	if (!node)
		return;
	for(i=0; i<MAX_MACIO_CHIPS; i++) {
		if (!macio_chips[i].of_node)
			break;
		if (macio_chips[i].of_node == node)
			return;
	}
	if (i >= MAX_MACIO_CHIPS) {
		printk(KERN_ERR "pmac_feature: Please increase MAX_MACIO_CHIPS !\n");
		printk(KERN_ERR "pmac_feature: %s skipped\n", node->full_name);
		return;
	}
	base = (volatile u32*)ioremap(node->addrs[0].address, node->addrs[0].size);
	if (!base) {
		printk(KERN_ERR "pmac_feature: Can't map mac-io chip !\n");
		return;
	}
	if (type == macio_keylargo) {
		u32* did = (u32 *)get_property(node, "device-id", NULL);
		if (*did == 0x00000025)
			type = macio_pangea;
		if (*did == 0x0000003e)
			type = macio_intrepid;
	}
	macio_chips[i].of_node	= node;
	macio_chips[i].type	= type;
	macio_chips[i].base	= base;
	macio_chips[i].flags	= MACIO_FLAG_SCCB_ON | MACIO_FLAG_SCCB_ON;
	macio_chips[i].name 	= macio_names[type];
	revp = (u32 *)get_property(node, "revision-id", NULL);
	if (revp)
		macio_chips[i].rev = *revp;
	printk(KERN_INFO "Found a %s mac-io controller, rev: %d, mapped at 0x%p\n",
		macio_names[type], macio_chips[i].rev, macio_chips[i].base);
}

static int __init
probe_macios(void)
{
	probe_one_macio("mac-io", "K2-Keylargo", macio_keylargo2);

	macio_chips[0].lbus.index = 0;
	macio_chips[1].lbus.index = 1;

	return (macio_chips[0].of_node == NULL) ? -ENODEV : 0;
}

static void __init
set_initial_features(void)
{
	struct device_node *np;

	if (macio_chips[0].type == macio_keylargo2) {
#ifndef CONFIG_SMP
		/* On SMP machines running UP, we have the second CPU eating
		 * bus cycles. We need to take it off the bus. This is done
		 * from pmac_smp for SMP kernels running on one CPU
		 */
		np = of_find_node_by_type(NULL, "cpu");
		if (np != NULL)
			np = of_find_node_by_type(np, "cpu");
		if (np != NULL) {
			g5_phy_disable_cpu1();
			of_node_put(np);
		}
#endif /* CONFIG_SMP */
		/* Enable GMAC for now for PCI probing. It will be disabled
		 * later on after PCI probe
		 */
		np = of_find_node_by_name(NULL, "ethernet");
		while(np) {
			if (device_is_compatible(np, "K2-GMAC"))
				g5_gmac_enable(np, 0, 1);
			np = of_find_node_by_name(np, "ethernet");
		}

		/* Enable FW before PCI probe. Will be disabled later on
		 * Note: We should have a batter way to check that we are
		 * dealing with uninorth internal cell and not a PCI cell
		 * on the external PCI. The code below works though.
		 */
		np = of_find_node_by_name(NULL, "firewire");
		while(np) {
			if (device_is_compatible(np, "pci106b,5811")) {
				macio_chips[0].flags |= MACIO_FLAG_FW_SUPPORTED;
				g5_fw_enable(np, 0, 1);
			}
			np = of_find_node_by_name(np, "firewire");
		}
	}
}

void __init
pmac_feature_init(void)
{
	/* Detect the UniNorth memory controller */
	probe_uninorth();

	/* Probe mac-io controllers */
	if (probe_macios()) {
		printk(KERN_WARNING "No mac-io chip found\n");
		return;
	}

	/* Setup low-level i2c stuffs */
	pmac_init_low_i2c();

	/* Probe machine type */
	if (probe_motherboard())
		printk(KERN_WARNING "Unknown PowerMac !\n");

	/* Set some initial features (turn off some chips that will
	 * be later turned on)
	 */
	set_initial_features();
}

int __init pmac_feature_late_init(void)
{
#if 0
	struct device_node* np;

	/* Request some resources late */
	if (uninorth_node)
		request_OF_resource(uninorth_node, 0, NULL);
	np = find_devices("hammerhead");
	if (np)
		request_OF_resource(np, 0, NULL);
	np = find_devices("interrupt-controller");
	if (np)
		request_OF_resource(np, 0, NULL);
#endif
	return 0;
}

device_initcall(pmac_feature_late_init);

#if 0
static void dump_HT_speeds(char *name, u32 cfg, u32 frq)
{
	int	freqs[16] = { 200,300,400,500,600,800,1000,0,0,0,0,0,0,0,0,0 };
	int	bits[8] = { 8,16,0,32,2,4,0,0 };
	int	freq = (frq >> 8) & 0xf;

	if (freqs[freq] == 0)
		printk("%s: Unknown HT link frequency %x\n", name, freq);
	else
		printk("%s: %d MHz on main link, (%d in / %d out) bits width\n",
		       name, freqs[freq],
		       bits[(cfg >> 28) & 0x7], bits[(cfg >> 24) & 0x7]);
}
#endif

void __init pmac_check_ht_link(void)
{
#if 0 /* Disabled for now */
	u32	ufreq, freq, ucfg, cfg;
	struct device_node *pcix_node;
	struct pci_dn *pdn;
	u8  	px_bus, px_devfn;
	struct pci_controller *px_hose;

	(void)in_be32(u3_ht + U3_HT_LINK_COMMAND);
	ucfg = cfg = in_be32(u3_ht + U3_HT_LINK_CONFIG);
	ufreq = freq = in_be32(u3_ht + U3_HT_LINK_FREQ);
	dump_HT_speeds("U3 HyperTransport", cfg, freq);

	pcix_node = of_find_compatible_node(NULL, "pci", "pci-x");
	if (pcix_node == NULL) {
		printk("No PCI-X bridge found\n");
		return;
	}
	pdn = pcix_node->data;
	px_hose = pdn->phb;
	px_bus = pdn->busno;
	px_devfn = pdn->devfn;
	
	early_read_config_dword(px_hose, px_bus, px_devfn, 0xc4, &cfg);
	early_read_config_dword(px_hose, px_bus, px_devfn, 0xcc, &freq);
	dump_HT_speeds("PCI-X HT Uplink", cfg, freq);
	early_read_config_dword(px_hose, px_bus, px_devfn, 0xc8, &cfg);
	early_read_config_dword(px_hose, px_bus, px_devfn, 0xd0, &freq);
	dump_HT_speeds("PCI-X HT Downlink", cfg, freq);
#endif
}

/*
 * Early video resume hook
 */

static void (*pmac_early_vresume_proc)(void *data);
static void *pmac_early_vresume_data;

void pmac_set_early_video_resume(void (*proc)(void *data), void *data)
{
	if (_machine != _MACH_Pmac)
		return;
	preempt_disable();
	pmac_early_vresume_proc = proc;
	pmac_early_vresume_data = data;
	preempt_enable();
}
EXPORT_SYMBOL(pmac_set_early_video_resume);


/*
 * AGP related suspend/resume code
 */

static struct pci_dev *pmac_agp_bridge;
static int (*pmac_agp_suspend)(struct pci_dev *bridge);
static int (*pmac_agp_resume)(struct pci_dev *bridge);

void pmac_register_agp_pm(struct pci_dev *bridge,
				 int (*suspend)(struct pci_dev *bridge),
				 int (*resume)(struct pci_dev *bridge))
{
	if (suspend || resume) {
		pmac_agp_bridge = bridge;
		pmac_agp_suspend = suspend;
		pmac_agp_resume = resume;
		return;
	}
	if (bridge != pmac_agp_bridge)
		return;
	pmac_agp_suspend = pmac_agp_resume = NULL;
	return;
}
EXPORT_SYMBOL(pmac_register_agp_pm);

void pmac_suspend_agp_for_card(struct pci_dev *dev)
{
	if (pmac_agp_bridge == NULL || pmac_agp_suspend == NULL)
		return;
	if (pmac_agp_bridge->bus != dev->bus)
		return;
	pmac_agp_suspend(pmac_agp_bridge);
}
EXPORT_SYMBOL(pmac_suspend_agp_for_card);

void pmac_resume_agp_for_card(struct pci_dev *dev)
{
	if (pmac_agp_bridge == NULL || pmac_agp_resume == NULL)
		return;
	if (pmac_agp_bridge->bus != dev->bus)
		return;
	pmac_agp_resume(pmac_agp_bridge);
}
EXPORT_SYMBOL(pmac_resume_agp_for_card);