summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/powermac/setup.c
blob: 4d15e396655c1a095ab8c4a5df6600e054ab4c99 (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
/*
 *  Powermac setup and early boot code plus other random bits.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  Maintained by Benjamin 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.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/ide.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/bitops.h>
#include <linux/suspend.h>

#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/kexec.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/of_device.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/smu.h>
#include <asm/pmc.h>
#include <asm/lmb.h>
#include <asm/udbg.h>

#include "pmac.h"

#undef SHOW_GATWICK_IRQS

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

int pmac_newworld;

static int current_root_goodness = -1;

extern struct machdep_calls pmac_md;

#define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */

#ifdef CONFIG_PPC64
#include <asm/udbg.h>
int sccdbg;
#endif

extern void zs_kgdb_hook(int tty_num);

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
EXPORT_SYMBOL(sys_ctrler);

#ifdef CONFIG_PMAC_SMU
unsigned long smu_cmdbuf_abs;
EXPORT_SYMBOL(smu_cmdbuf_abs);
#endif

#ifdef CONFIG_SMP
extern struct smp_ops_t psurge_smp_ops;
extern struct smp_ops_t core99_smp_ops;
#endif /* CONFIG_SMP */

static void pmac_show_cpuinfo(struct seq_file *m)
{
	struct device_node *np;
	char *pp;
	int plen;
	int mbmodel;
	unsigned int mbflags;
	char* mbname;

	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
				    PMAC_MB_INFO_MODEL, 0);
	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
				    PMAC_MB_INFO_FLAGS, 0);
	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
			      (long) &mbname) != 0)
		mbname = "Unknown";

	/* find motherboard type */
	seq_printf(m, "machine\t\t: ");
	np = of_find_node_by_path("/");
	if (np != NULL) {
		pp = (char *) get_property(np, "model", NULL);
		if (pp != NULL)
			seq_printf(m, "%s\n", pp);
		else
			seq_printf(m, "PowerMac\n");
		pp = (char *) get_property(np, "compatible", &plen);
		if (pp != NULL) {
			seq_printf(m, "motherboard\t:");
			while (plen > 0) {
				int l = strlen(pp) + 1;
				seq_printf(m, " %s", pp);
				plen -= l;
				pp += l;
			}
			seq_printf(m, "\n");
		}
		of_node_put(np);
	} else
		seq_printf(m, "PowerMac\n");

	/* print parsed model */
	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
	seq_printf(m, "pmac flags\t: %08x\n", mbflags);

	/* find l2 cache info */
	np = of_find_node_by_name(NULL, "l2-cache");
	if (np == NULL)
		np = of_find_node_by_type(NULL, "cache");
	if (np != NULL) {
		unsigned int *ic = (unsigned int *)
			get_property(np, "i-cache-size", NULL);
		unsigned int *dc = (unsigned int *)
			get_property(np, "d-cache-size", NULL);
		seq_printf(m, "L2 cache\t:");
		has_l2cache = 1;
		if (get_property(np, "cache-unified", NULL) != 0 && dc) {
			seq_printf(m, " %dK unified", *dc / 1024);
		} else {
			if (ic)
				seq_printf(m, " %dK instruction", *ic / 1024);
			if (dc)
				seq_printf(m, "%s %dK data",
					   (ic? " +": ""), *dc / 1024);
		}
		pp = get_property(np, "ram-type", NULL);
		if (pp)
			seq_printf(m, " %s", pp);
		seq_printf(m, "\n");
		of_node_put(np);
	}

	/* Indicate newworld/oldworld */
	seq_printf(m, "pmac-generation\t: %s\n",
		   pmac_newworld ? "NewWorld" : "OldWorld");
}

#ifndef CONFIG_ADB_CUDA
int find_via_cuda(void)
{
	if (!find_devices("via-cuda"))
		return 0;
	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
	return 0;
}
#endif

#ifndef CONFIG_ADB_PMU
int find_via_pmu(void)
{
	if (!find_devices("via-pmu"))
		return 0;
	printk("WARNING ! Your machine is PMU-based but your kernel\n");
	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
	return 0;
}
#endif

#ifndef CONFIG_PMAC_SMU
int smu_init(void)
{
	/* should check and warn if SMU is present */
	return 0;
}
#endif

#ifdef CONFIG_PPC32
static volatile u32 *sysctrl_regs;

static void __init ohare_init(void)
{
	/* this area has the CPU identification register
	   and some registers used by smp boards */
	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);

	/*
	 * Turn on the L2 cache.
	 * We assume that we have a PSX memory controller iff
	 * we have an ohare I/O controller.
	 */
	if (find_devices("ohare") != NULL) {
		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
			if (sysctrl_regs[4] & 0x10)
				sysctrl_regs[4] |= 0x04000020;
			else
				sysctrl_regs[4] |= 0x04000000;
			if(has_l2cache)
				printk(KERN_INFO "Level 2 cache enabled\n");
		}
	}
}

static void __init l2cr_init(void)
{
	/* Checks "l2cr-value" property in the registry */
	if (cpu_has_feature(CPU_FTR_L2CR)) {
		struct device_node *np = find_devices("cpus");
		if (np == 0)
			np = find_type_devices("cpu");
		if (np != 0) {
			unsigned int *l2cr = (unsigned int *)
				get_property(np, "l2cr-value", NULL);
			if (l2cr != 0) {
				ppc_override_l2cr = 1;
				ppc_override_l2cr_value = *l2cr;
				_set_L2CR(0);
				_set_L2CR(ppc_override_l2cr_value);
			}
		}
	}

	if (ppc_override_l2cr)
		printk(KERN_INFO "L2CR overridden (0x%x), "
		       "backside cache is %s\n",
		       ppc_override_l2cr_value,
		       (ppc_override_l2cr_value & 0x80000000)
				? "enabled" : "disabled");
}
#endif

static void __init pmac_setup_arch(void)
{
	struct device_node *cpu, *ic;
	int *fp;
	unsigned long pvr;

	pvr = PVR_VER(mfspr(SPRN_PVR));

	/* Set loops_per_jiffy to a half-way reasonable value,
	   for use until calibrate_delay gets called. */
	loops_per_jiffy = 50000000 / HZ;
	cpu = of_find_node_by_type(NULL, "cpu");
	if (cpu != NULL) {
		fp = (int *) get_property(cpu, "clock-frequency", NULL);
		if (fp != NULL) {
			if (pvr >= 0x30 && pvr < 0x80)
				/* PPC970 etc. */
				loops_per_jiffy = *fp / (3 * HZ);
			else if (pvr == 4 || pvr >= 8)
				/* 604, G3, G4 etc. */
				loops_per_jiffy = *fp / HZ;
			else
				/* 601, 603, etc. */
				loops_per_jiffy = *fp / (2 * HZ);
		}
		of_node_put(cpu);
	}

	/* See if newworld or oldworld */
	for (ic = NULL; (ic = of_find_all_nodes(ic)) != NULL; )
		if (get_property(ic, "interrupt-controller", NULL))
			break;
	if (ic) {
		pmac_newworld = 1;
		of_node_put(ic);
	}

	/* Lookup PCI hosts */
	pmac_pci_init();

#ifdef CONFIG_PPC32
	ohare_init();
	l2cr_init();
#endif /* CONFIG_PPC32 */

#ifdef CONFIG_KGDB
	zs_kgdb_hook(0);
#endif

	find_via_cuda();
	find_via_pmu();
	smu_init();

#if defined(CONFIG_NVRAM) || defined(CONFIG_PPC64)
	pmac_nvram_init();
#endif

#ifdef CONFIG_PPC32
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = Root_RAM0;
	else
#endif
		ROOT_DEV = DEFAULT_ROOT_DEVICE;
#endif

#ifdef CONFIG_SMP
	/* Check for Core99 */
	if (find_devices("uni-n") || find_devices("u3") || find_devices("u4"))
		smp_ops = &core99_smp_ops;
#ifdef CONFIG_PPC32
	else
		smp_ops = &psurge_smp_ops;
#endif
#endif /* CONFIG_SMP */

#ifdef CONFIG_ADB
	if (strstr(cmd_line, "adb_sync")) {
		extern int __adb_probe_sync;
		__adb_probe_sync = 1;
	}
#endif /* CONFIG_ADB */
}

char *bootpath;
char *bootdevice;
void *boot_host;
int boot_target;
int boot_part;
extern dev_t boot_dev;

#ifdef CONFIG_SCSI
void __init note_scsi_host(struct device_node *node, void *host)
{
	int l;
	char *p;

	l = strlen(node->full_name);
	if (bootpath != NULL && bootdevice != NULL
	    && strncmp(node->full_name, bootdevice, l) == 0
	    && (bootdevice[l] == '/' || bootdevice[l] == 0)) {
		boot_host = host;
		/*
		 * There's a bug in OF 1.0.5.  (Why am I not surprised.)
		 * If you pass a path like scsi/sd@1:0 to canon, it returns
		 * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
		 * That is, the scsi target number doesn't get preserved.
		 * So we pick the target number out of bootpath and use that.
		 */
		p = strstr(bootpath, "/sd@");
		if (p != NULL) {
			p += 4;
			boot_target = simple_strtoul(p, NULL, 10);
			p = strchr(p, ':');
			if (p != NULL)
				boot_part = simple_strtoul(p + 1, NULL, 10);
		}
	}
}
EXPORT_SYMBOL(note_scsi_host);
#endif

#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
static dev_t __init find_ide_boot(void)
{
	char *p;
	int n;
	dev_t __init pmac_find_ide_boot(char *bootdevice, int n);

	if (bootdevice == NULL)
		return 0;
	p = strrchr(bootdevice, '/');
	if (p == NULL)
		return 0;
	n = p - bootdevice;

	return pmac_find_ide_boot(bootdevice, n);
}
#endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */

static void __init find_boot_device(void)
{
#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
	boot_dev = find_ide_boot();
#endif
}

/* TODO: Merge the suspend-to-ram with the common code !!!
 * currently, this is a stub implementation for suspend-to-disk
 * only
 */

#ifdef CONFIG_SOFTWARE_SUSPEND

static int pmac_pm_prepare(suspend_state_t state)
{
	printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);

	return 0;
}

static int pmac_pm_enter(suspend_state_t state)
{
	printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);

	/* Giveup the lazy FPU & vec so we don't have to back them
	 * up from the low level code
	 */
	enable_kernel_fp();

#ifdef CONFIG_ALTIVEC
	if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
		enable_kernel_altivec();
#endif /* CONFIG_ALTIVEC */

	return 0;
}

static int pmac_pm_finish(suspend_state_t state)
{
	printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);

	/* Restore userland MMU context */
	set_context(current->active_mm->context, current->active_mm->pgd);

	return 0;
}

static struct pm_ops pmac_pm_ops = {
	.pm_disk_mode	= PM_DISK_SHUTDOWN,
	.prepare	= pmac_pm_prepare,
	.enter		= pmac_pm_enter,
	.finish		= pmac_pm_finish,
};

#endif /* CONFIG_SOFTWARE_SUSPEND */

static int initializing = 1;

static int pmac_late_init(void)
{
	initializing = 0;
#ifdef CONFIG_SOFTWARE_SUSPEND
	pm_set_ops(&pmac_pm_ops);
#endif /* CONFIG_SOFTWARE_SUSPEND */
	return 0;
}

late_initcall(pmac_late_init);

/* can't be __init - can be called whenever a disk is first accessed */
void note_bootable_part(dev_t dev, int part, int goodness)
{
	static int found_boot = 0;
	char *p;

	if (!initializing)
		return;
	if ((goodness <= current_root_goodness) &&
	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
		return;
	p = strstr(saved_command_line, "root=");
	if (p != NULL && (p == saved_command_line || p[-1] == ' '))
		return;

	if (!found_boot) {
		find_boot_device();
		found_boot = 1;
	}
	if (!boot_dev || dev == boot_dev) {
		ROOT_DEV = dev + part;
		boot_dev = 0;
		current_root_goodness = goodness;
	}
}

#ifdef CONFIG_ADB_CUDA
static void cuda_restart(void)
{
	struct adb_request req;

	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
	for (;;)
		cuda_poll();
}

static void cuda_shutdown(void)
{
	struct adb_request req;

	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
	for (;;)
		cuda_poll();
}

#else
#define cuda_restart()
#define cuda_shutdown()
#endif

#ifndef CONFIG_ADB_PMU
#define pmu_restart()
#define pmu_shutdown()
#endif

#ifndef CONFIG_PMAC_SMU
#define smu_restart()
#define smu_shutdown()
#endif

static void pmac_restart(char *cmd)
{
	switch (sys_ctrler) {
	case SYS_CTRLER_CUDA:
		cuda_restart();
		break;
	case SYS_CTRLER_PMU:
		pmu_restart();
		break;
	case SYS_CTRLER_SMU:
		smu_restart();
		break;
	default: ;
	}
}

static void pmac_power_off(void)
{
	switch (sys_ctrler) {
	case SYS_CTRLER_CUDA:
		cuda_shutdown();
		break;
	case SYS_CTRLER_PMU:
		pmu_shutdown();
		break;
	case SYS_CTRLER_SMU:
		smu_shutdown();
		break;
	default: ;
	}
}

static void
pmac_halt(void)
{
	pmac_power_off();
}

/* 
 * Early initialization.
 */
static void __init pmac_init_early(void)
{
#ifdef CONFIG_PPC64
	/* Initialize hash table, from now on, we can take hash faults
	 * and call ioremap
	 */
	hpte_init_native();
#endif

	/* Enable early btext debug if requested */
	if (strstr(cmd_line, "btextdbg")) {
		udbg_adb_init_early();
		register_early_udbg_console();
	}

	/* Probe motherboard chipset */
	pmac_feature_init();

	/* Initialize debug stuff */
	udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
	udbg_adb_init(!!strstr(cmd_line, "btextdbg"));

#ifdef CONFIG_PPC64
	/* Setup interrupt mapping options */
	ppc64_interrupt_controller = IC_OPEN_PIC;

	iommu_init_early_dart();
#endif
}

/*
 * pmac has no legacy IO, anything calling this function has to
 * fail or bad things will happen
 */
static int pmac_check_legacy_ioport(unsigned int baseport)
{
	return -ENODEV;
}

static int __init pmac_declare_of_platform_devices(void)
{
	struct device_node *np;

	if (machine_is(chrp))
		return -1;

	if (!machine_is(powermac))
		return 0;

	np = of_find_node_by_name(NULL, "valkyrie");
	if (np)
		of_platform_device_create(np, "valkyrie", NULL);
	np = of_find_node_by_name(NULL, "platinum");
	if (np)
		of_platform_device_create(np, "platinum", NULL);
        np = of_find_node_by_type(NULL, "smu");
        if (np) {
		of_platform_device_create(np, "smu", NULL);
		of_node_put(np);
	}

	return 0;
}

device_initcall(pmac_declare_of_platform_devices);

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init pmac_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
	    !of_flat_dt_is_compatible(root, "MacRISC"))
		return 0;

#ifdef CONFIG_PPC64
	/*
	 * On U3, the DART (iommu) must be allocated now since it
	 * has an impact on htab_initialize (due to the large page it
	 * occupies having to be broken up so the DART itself is not
	 * part of the cacheable linar mapping
	 */
	alloc_dart_table();
#endif

#ifdef CONFIG_PPC32
	/* isa_io_base gets set in pmac_pci_init */
	isa_mem_base = PMAC_ISA_MEM_BASE;
	pci_dram_offset = PMAC_PCI_DRAM_OFFSET;
	ISA_DMA_THRESHOLD = ~0L;
	DMA_MODE_READ = 1;
	DMA_MODE_WRITE = 2;

#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
#ifdef CONFIG_BLK_DEV_IDE_PMAC
        ppc_ide_md.ide_init_hwif	= pmac_ide_init_hwif_ports;
        ppc_ide_md.default_io_base	= pmac_ide_get_base;
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */

#endif /* CONFIG_PPC32 */

#ifdef CONFIG_PMAC_SMU
	/*
	 * SMU based G5s need some memory below 2Gb, at least the current
	 * driver needs that. We have to allocate it now. We allocate 4k
	 * (1 small page) for now.
	 */
	smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
#endif /* CONFIG_PMAC_SMU */

	return 1;
}

#ifdef CONFIG_PPC64
/* Move that to pci.c */
static int pmac_pci_probe_mode(struct pci_bus *bus)
{
	struct device_node *node = bus->sysdata;

	/* We need to use normal PCI probing for the AGP bus,
	 * since the device for the AGP bridge isn't in the tree.
	 */
	if (bus->self == NULL && (device_is_compatible(node, "u3-agp") ||
				  device_is_compatible(node, "u4-pcie")))
		return PCI_PROBE_NORMAL;
	return PCI_PROBE_DEVTREE;
}
#endif

define_machine(powermac) {
	.name			= "PowerMac",
	.probe			= pmac_probe,
	.setup_arch		= pmac_setup_arch,
	.init_early		= pmac_init_early,
	.show_cpuinfo		= pmac_show_cpuinfo,
	.init_IRQ		= pmac_pic_init,
	.get_irq		= NULL,	/* changed later */
	.pcibios_fixup		= pmac_pcibios_fixup,
	.restart		= pmac_restart,
	.power_off		= pmac_power_off,
	.halt			= pmac_halt,
	.time_init		= pmac_time_init,
	.get_boot_time		= pmac_get_boot_time,
	.set_rtc_time		= pmac_set_rtc_time,
	.get_rtc_time		= pmac_get_rtc_time,
	.calibrate_decr		= pmac_calibrate_decr,
	.feature_call		= pmac_do_feature_call,
	.check_legacy_ioport	= pmac_check_legacy_ioport,
	.progress		= udbg_progress,
#ifdef CONFIG_PPC64
	.pci_probe_mode		= pmac_pci_probe_mode,
	.power_save		= power4_idle,
	.enable_pmcs		= power4_enable_pmcs,
#ifdef CONFIG_KEXEC
	.machine_kexec		= default_machine_kexec,
	.machine_kexec_prepare	= default_machine_kexec_prepare,
	.machine_crash_shutdown	= default_machine_crash_shutdown,
#endif
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC32
	.pcibios_enable_device_hook = pmac_pci_enable_device_hook,
	.pcibios_after_init	= pmac_pcibios_after_init,
	.phys_mem_access_prot	= pci_phys_mem_access_prot,
#endif
#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
	.cpu_die		= generic_mach_cpu_die,
#endif
};