aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/nubus/nubus.c
blob: 4621ff98138ce5fc1d862e735bff89aa3f2ea5b4 (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
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
// SPDX-License-Identifier: GPL-2.0
/*
 *	Macintosh Nubus Interface Code
 *
 *      Originally by Alan Cox
 *
 *      Mostly rewritten by David Huggins-Daines, C. Scott Ananian,
 *      and others.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/nubus.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/hwtest.h>

/* Constants */

/* This is, of course, the size in bytelanes, rather than the size in
   actual bytes */
#define FORMAT_BLOCK_SIZE 20
#define ROM_DIR_OFFSET 0x24

#define NUBUS_TEST_PATTERN 0x5A932BC7

/* Globals */

LIST_HEAD(nubus_func_rsrcs);

/* Meaning of "bytelanes":

   The card ROM may appear on any or all bytes of each long word in
   NuBus memory.  The low 4 bits of the "map" value found in the
   format block (at the top of the slot address space, as well as at
   the top of the MacOS ROM) tells us which bytelanes, i.e. which byte
   offsets within each longword, are valid.  Thus:

   A map of 0x0f, as found in the MacOS ROM, means that all bytelanes
   are valid.

   A map of 0xf0 means that no bytelanes are valid (We pray that we
   will never encounter this, but stranger things have happened)

   A map of 0xe1 means that only the MSB of each long word is actually
   part of the card ROM.  (We hope to never encounter NuBus on a
   little-endian machine.  Again, stranger things have happened)

   A map of 0x78 means that only the LSB of each long word is valid.

   Etcetera, etcetera.  Hopefully this clears up some confusion over
   what the following code actually does.  */

static inline int not_useful(void *p, int map)
{
	unsigned long pv = (unsigned long)p;

	pv &= 3;
	if (map & (1 << pv))
		return 0;
	return 1;
}

static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map)
{
	/* This will hold the result */
	unsigned long v = 0;
	unsigned char *p = *ptr;

	while (len) {
		v <<= 8;
		while (not_useful(p, map))
			p++;
		v |= *p++;
		len--;
	}
	*ptr = p;
	return v;
}

static void nubus_rewind(unsigned char **ptr, int len, int map)
{
	unsigned char *p = *ptr;

	while (len) {
		do {
			p--;
		} while (not_useful(p, map));
		len--;
	}
	*ptr = p;
}

static void nubus_advance(unsigned char **ptr, int len, int map)
{
	unsigned char *p = *ptr;

	while (len) {
		while (not_useful(p, map))
			p++;
		p++;
		len--;
	}
	*ptr = p;
}

static void nubus_move(unsigned char **ptr, int len, int map)
{
	unsigned long slot_space = (unsigned long)*ptr & 0xFF000000;

	if (len > 0)
		nubus_advance(ptr, len, map);
	else if (len < 0)
		nubus_rewind(ptr, -len, map);

	if (((unsigned long)*ptr & 0xFF000000) != slot_space)
		pr_err("%s: moved out of slot address space!\n", __func__);
}

/* Now, functions to read the sResource tree */

/* Each sResource entry consists of a 1-byte ID and a 3-byte data
   field.  If that data field contains an offset, then obviously we
   have to expand it from a 24-bit signed number to a 32-bit signed
   number. */

static inline long nubus_expand32(long foo)
{
	if (foo & 0x00800000)	/* 24bit negative */
		foo |= 0xFF000000;
	return foo;
}

static inline void *nubus_rom_addr(int slot)
{
	/*
	 *	Returns the first byte after the card. We then walk
	 *	backwards to get the lane register and the config
	 */
	return (void *)(0xF1000000 + (slot << 24));
}

unsigned char *nubus_dirptr(const struct nubus_dirent *nd)
{
	unsigned char *p = nd->base;

	/* Essentially, just step over the bytelanes using whatever
	   offset we might have found */
	nubus_move(&p, nubus_expand32(nd->data), nd->mask);
	/* And return the value */
	return p;
}

/* These two are for pulling resource data blocks (i.e. stuff that's
   pointed to with offsets) out of the card ROM. */

void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent *dirent,
			unsigned int len)
{
	unsigned char *t = (unsigned char *)dest;
	unsigned char *p = nubus_dirptr(dirent);

	while (len) {
		*t++ = nubus_get_rom(&p, 1, dirent->mask);
		len--;
	}
}
EXPORT_SYMBOL(nubus_get_rsrc_mem);

unsigned int nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
				unsigned int len)
{
	char *t = dest;
	unsigned char *p = nubus_dirptr(dirent);

	while (len > 1) {
		unsigned char c = nubus_get_rom(&p, 1, dirent->mask);

		if (!c)
			break;
		*t++ = c;
		len--;
	}
	if (len > 0)
		*t = '\0';
	return t - dest;
}
EXPORT_SYMBOL(nubus_get_rsrc_str);

void nubus_seq_write_rsrc_mem(struct seq_file *m,
			      const struct nubus_dirent *dirent,
			      unsigned int len)
{
	unsigned long buf[32];
	unsigned int buf_size = sizeof(buf);
	unsigned char *p = nubus_dirptr(dirent);

	/* If possible, write out full buffers */
	while (len >= buf_size) {
		unsigned int i;

		for (i = 0; i < ARRAY_SIZE(buf); i++)
			buf[i] = nubus_get_rom(&p, sizeof(buf[0]),
					       dirent->mask);
		seq_write(m, buf, buf_size);
		len -= buf_size;
	}
	/* If not, write out individual bytes */
	while (len--)
		seq_putc(m, nubus_get_rom(&p, 1, dirent->mask));
}

int nubus_get_root_dir(const struct nubus_board *board,
		       struct nubus_dir *dir)
{
	dir->ptr = dir->base = board->directory;
	dir->done = 0;
	dir->mask = board->lanes;
	return 0;
}
EXPORT_SYMBOL(nubus_get_root_dir);

/* This is a slyly renamed version of the above */
int nubus_get_func_dir(const struct nubus_rsrc *fres, struct nubus_dir *dir)
{
	dir->ptr = dir->base = fres->directory;
	dir->done = 0;
	dir->mask = fres->board->lanes;
	return 0;
}
EXPORT_SYMBOL(nubus_get_func_dir);

int nubus_get_board_dir(const struct nubus_board *board,
			struct nubus_dir *dir)
{
	struct nubus_dirent ent;

	dir->ptr = dir->base = board->directory;
	dir->done = 0;
	dir->mask = board->lanes;

	/* Now dereference it (the first directory is always the board
	   directory) */
	if (nubus_readdir(dir, &ent) == -1)
		return -1;
	if (nubus_get_subdir(&ent, dir) == -1)
		return -1;
	return 0;
}
EXPORT_SYMBOL(nubus_get_board_dir);

int nubus_get_subdir(const struct nubus_dirent *ent,
		     struct nubus_dir *dir)
{
	dir->ptr = dir->base = nubus_dirptr(ent);
	dir->done = 0;
	dir->mask = ent->mask;
	return 0;
}
EXPORT_SYMBOL(nubus_get_subdir);

int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent)
{
	u32 resid;

	if (nd->done)
		return -1;

	/* Do this first, otherwise nubus_rewind & co are off by 4 */
	ent->base = nd->ptr;

	/* This moves nd->ptr forward */
	resid = nubus_get_rom(&nd->ptr, 4, nd->mask);

	/* EOL marker, as per the Apple docs */
	if ((resid & 0xff000000) == 0xff000000) {
		/* Mark it as done */
		nd->done = 1;
		return -1;
	}

	/* First byte is the resource ID */
	ent->type = resid >> 24;
	/* Low 3 bytes might contain data (or might not) */
	ent->data = resid & 0xffffff;
	ent->mask = nd->mask;
	return 0;
}
EXPORT_SYMBOL(nubus_readdir);

int nubus_rewinddir(struct nubus_dir *dir)
{
	dir->ptr = dir->base;
	dir->done = 0;
	return 0;
}
EXPORT_SYMBOL(nubus_rewinddir);

/* Driver interface functions, more or less like in pci.c */

struct nubus_rsrc *nubus_first_rsrc_or_null(void)
{
	return list_first_entry_or_null(&nubus_func_rsrcs, struct nubus_rsrc,
					list);
}
EXPORT_SYMBOL(nubus_first_rsrc_or_null);

struct nubus_rsrc *nubus_next_rsrc_or_null(struct nubus_rsrc *from)
{
	if (list_is_last(&from->list, &nubus_func_rsrcs))
		return NULL;
	return list_next_entry(from, list);
}
EXPORT_SYMBOL(nubus_next_rsrc_or_null);

int
nubus_find_rsrc(struct nubus_dir *dir, unsigned char rsrc_type,
		struct nubus_dirent *ent)
{
	while (nubus_readdir(dir, ent) != -1) {
		if (ent->type == rsrc_type)
			return 0;
	}
	return -1;
}
EXPORT_SYMBOL(nubus_find_rsrc);

/* Initialization functions - decide which slots contain stuff worth
   looking at, and print out lots and lots of information from the
   resource blocks. */

static int __init nubus_get_block_rsrc_dir(struct nubus_board *board,
					   struct proc_dir_entry *procdir,
					   const struct nubus_dirent *parent)
{
	struct nubus_dir dir;
	struct nubus_dirent ent;

	nubus_get_subdir(parent, &dir);
	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);

	while (nubus_readdir(&dir, &ent) != -1) {
		u32 size;

		nubus_get_rsrc_mem(&size, &ent, 4);
		pr_debug("        block (0x%x), size %d\n", ent.type, size);
		nubus_proc_add_rsrc_mem(dir.procdir, &ent, size);
	}
	return 0;
}

static int __init nubus_get_display_vidmode(struct nubus_board *board,
					    struct proc_dir_entry *procdir,
					    const struct nubus_dirent *parent)
{
	struct nubus_dir dir;
	struct nubus_dirent ent;

	nubus_get_subdir(parent, &dir);
	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);

	while (nubus_readdir(&dir, &ent) != -1) {
		switch (ent.type) {
		case 1: /* mVidParams */
		case 2: /* mTable */
		{
			u32 size;

			nubus_get_rsrc_mem(&size, &ent, 4);
			pr_debug("        block (0x%x), size %d\n", ent.type,
				size);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, size);
			break;
		}
		default:
			pr_debug("        unknown resource 0x%02x, data 0x%06x\n",
				ent.type, ent.data);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 0);
		}
	}
	return 0;
}

static int __init nubus_get_display_resource(struct nubus_rsrc *fres,
					     struct proc_dir_entry *procdir,
					     const struct nubus_dirent *ent)
{
	switch (ent->type) {
	case NUBUS_RESID_GAMMADIR:
		pr_debug("    gamma directory offset: 0x%06x\n", ent->data);
		nubus_get_block_rsrc_dir(fres->board, procdir, ent);
		break;
	case 0x0080 ... 0x0085:
		pr_debug("    mode 0x%02x info offset: 0x%06x\n",
			ent->type, ent->data);
		nubus_get_display_vidmode(fres->board, procdir, ent);
		break;
	default:
		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
			ent->type, ent->data);
		nubus_proc_add_rsrc_mem(procdir, ent, 0);
	}
	return 0;
}

static int __init nubus_get_network_resource(struct nubus_rsrc *fres,
					     struct proc_dir_entry *procdir,
					     const struct nubus_dirent *ent)
{
	switch (ent->type) {
	case NUBUS_RESID_MAC_ADDRESS:
	{
		char addr[6];

		nubus_get_rsrc_mem(addr, ent, 6);
		pr_debug("    MAC address: %pM\n", addr);
		nubus_proc_add_rsrc_mem(procdir, ent, 6);
		break;
	}
	default:
		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
			ent->type, ent->data);
		nubus_proc_add_rsrc_mem(procdir, ent, 0);
	}
	return 0;
}

static int __init nubus_get_cpu_resource(struct nubus_rsrc *fres,
					 struct proc_dir_entry *procdir,
					 const struct nubus_dirent *ent)
{
	switch (ent->type) {
	case NUBUS_RESID_MEMINFO:
	{
		unsigned long meminfo[2];

		nubus_get_rsrc_mem(&meminfo, ent, 8);
		pr_debug("    memory: [ 0x%08lx 0x%08lx ]\n",
			meminfo[0], meminfo[1]);
		nubus_proc_add_rsrc_mem(procdir, ent, 8);
		break;
	}
	case NUBUS_RESID_ROMINFO:
	{
		unsigned long rominfo[2];

		nubus_get_rsrc_mem(&rominfo, ent, 8);
		pr_debug("    ROM:    [ 0x%08lx 0x%08lx ]\n",
			rominfo[0], rominfo[1]);
		nubus_proc_add_rsrc_mem(procdir, ent, 8);
		break;
	}
	default:
		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
			ent->type, ent->data);
		nubus_proc_add_rsrc_mem(procdir, ent, 0);
	}
	return 0;
}

static int __init nubus_get_private_resource(struct nubus_rsrc *fres,
					     struct proc_dir_entry *procdir,
					     const struct nubus_dirent *ent)
{
	switch (fres->category) {
	case NUBUS_CAT_DISPLAY:
		nubus_get_display_resource(fres, procdir, ent);
		break;
	case NUBUS_CAT_NETWORK:
		nubus_get_network_resource(fres, procdir, ent);
		break;
	case NUBUS_CAT_CPU:
		nubus_get_cpu_resource(fres, procdir, ent);
		break;
	default:
		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
			ent->type, ent->data);
		nubus_proc_add_rsrc_mem(procdir, ent, 0);
	}
	return 0;
}

static struct nubus_rsrc * __init
nubus_get_functional_resource(struct nubus_board *board, int slot,
			      const struct nubus_dirent *parent)
{
	struct nubus_dir dir;
	struct nubus_dirent ent;
	struct nubus_rsrc *fres;

	pr_debug("  Functional resource 0x%02x:\n", parent->type);
	nubus_get_subdir(parent, &dir);
	dir.procdir = nubus_proc_add_rsrc_dir(board->procdir, parent, board);

	/* Actually we should probably panic if this fails */
	fres = kzalloc(sizeof(*fres), GFP_ATOMIC);
	if (!fres)
		return NULL;
	fres->resid = parent->type;
	fres->directory = dir.base;
	fres->board = board;

	while (nubus_readdir(&dir, &ent) != -1) {
		switch (ent.type) {
		case NUBUS_RESID_TYPE:
		{
			unsigned short nbtdata[4];

			nubus_get_rsrc_mem(nbtdata, &ent, 8);
			fres->category = nbtdata[0];
			fres->type     = nbtdata[1];
			fres->dr_sw    = nbtdata[2];
			fres->dr_hw    = nbtdata[3];
			pr_debug("    type: [cat 0x%x type 0x%x sw 0x%x hw 0x%x]\n",
				nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 8);
			break;
		}
		case NUBUS_RESID_NAME:
		{
			char name[64];
			unsigned int len;

			len = nubus_get_rsrc_str(name, &ent, sizeof(name));
			pr_debug("    name: %s\n", name);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
			break;
		}
		case NUBUS_RESID_DRVRDIR:
		{
			/* MacOS driver.  If we were NetBSD we might
			   use this :-) */
			pr_debug("    driver directory offset: 0x%06x\n",
				ent.data);
			nubus_get_block_rsrc_dir(board, dir.procdir, &ent);
			break;
		}
		case NUBUS_RESID_MINOR_BASEOS:
		{
			/* We will need this in order to support
			   multiple framebuffers.  It might be handy
			   for Ethernet as well */
			u32 base_offset;

			nubus_get_rsrc_mem(&base_offset, &ent, 4);
			pr_debug("    memory offset: 0x%08x\n", base_offset);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 4);
			break;
		}
		case NUBUS_RESID_MINOR_LENGTH:
		{
			/* Ditto */
			u32 length;

			nubus_get_rsrc_mem(&length, &ent, 4);
			pr_debug("    memory length: 0x%08x\n", length);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 4);
			break;
		}
		case NUBUS_RESID_FLAGS:
			pr_debug("    flags: 0x%06x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		case NUBUS_RESID_HWDEVID:
			pr_debug("    hwdevid: 0x%06x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		default:
			/* Local/Private resources have their own
			   function */
			nubus_get_private_resource(fres, dir.procdir, &ent);
		}
	}

	return fres;
}

/* This is *really* cool. */
static int __init nubus_get_icon(struct nubus_board *board,
				 struct proc_dir_entry *procdir,
				 const struct nubus_dirent *ent)
{
	/* Should be 32x32 if my memory serves me correctly */
	u32 icon[32];
	int i;

	nubus_get_rsrc_mem(&icon, ent, 128);
	pr_debug("    icon:\n");
	for (i = 0; i < 8; i++)
		pr_debug("        %08x %08x %08x %08x\n",
			icon[i * 4 + 0], icon[i * 4 + 1],
			icon[i * 4 + 2], icon[i * 4 + 3]);
	nubus_proc_add_rsrc_mem(procdir, ent, 128);

	return 0;
}

static int __init nubus_get_vendorinfo(struct nubus_board *board,
				       struct proc_dir_entry *procdir,
				       const struct nubus_dirent *parent)
{
	struct nubus_dir dir;
	struct nubus_dirent ent;
	static char *vendor_fields[6] = { "ID", "serial", "revision",
	                                  "part", "date", "unknown field" };

	pr_debug("    vendor info:\n");
	nubus_get_subdir(parent, &dir);
	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);

	while (nubus_readdir(&dir, &ent) != -1) {
		char name[64];
		unsigned int len;

		/* These are all strings, we think */
		len = nubus_get_rsrc_str(name, &ent, sizeof(name));
		if (ent.type < 1 || ent.type > 5)
			ent.type = 5;
		pr_debug("    %s: %s\n", vendor_fields[ent.type - 1], name);
		nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
	}
	return 0;
}

static int __init nubus_get_board_resource(struct nubus_board *board, int slot,
					   const struct nubus_dirent *parent)
{
	struct nubus_dir dir;
	struct nubus_dirent ent;

	pr_debug("  Board resource 0x%02x:\n", parent->type);
	nubus_get_subdir(parent, &dir);
	dir.procdir = nubus_proc_add_rsrc_dir(board->procdir, parent, board);

	while (nubus_readdir(&dir, &ent) != -1) {
		switch (ent.type) {
		case NUBUS_RESID_TYPE:
		{
			unsigned short nbtdata[4];
			/* This type is always the same, and is not
			   useful except insofar as it tells us that
			   we really are looking at a board resource. */
			nubus_get_rsrc_mem(nbtdata, &ent, 8);
			pr_debug("    type: [cat 0x%x type 0x%x sw 0x%x hw 0x%x]\n",
				nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
			if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
			    nbtdata[2] != 0 || nbtdata[3] != 0)
				pr_err("Slot %X: sResource is not a board resource!\n",
				       slot);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 8);
			break;
		}
		case NUBUS_RESID_NAME:
		{
			unsigned int len;

			len = nubus_get_rsrc_str(board->name, &ent,
						 sizeof(board->name));
			pr_debug("    name: %s\n", board->name);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
			break;
		}
		case NUBUS_RESID_ICON:
			nubus_get_icon(board, dir.procdir, &ent);
			break;
		case NUBUS_RESID_BOARDID:
			pr_debug("    board id: 0x%x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		case NUBUS_RESID_PRIMARYINIT:
			pr_debug("    primary init offset: 0x%06x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		case NUBUS_RESID_VENDORINFO:
			nubus_get_vendorinfo(board, dir.procdir, &ent);
			break;
		case NUBUS_RESID_FLAGS:
			pr_debug("    flags: 0x%06x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		case NUBUS_RESID_HWDEVID:
			pr_debug("    hwdevid: 0x%06x\n", ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		case NUBUS_RESID_SECONDINIT:
			pr_debug("    secondary init offset: 0x%06x\n",
				 ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
			/* WTF isn't this in the functional resources? */
		case NUBUS_RESID_VIDNAMES:
			pr_debug("    vidnames directory offset: 0x%06x\n",
				ent.data);
			nubus_get_block_rsrc_dir(board, dir.procdir, &ent);
			break;
			/* Same goes for this */
		case NUBUS_RESID_VIDMODES:
			pr_debug("    video mode parameter directory offset: 0x%06x\n",
				ent.data);
			nubus_proc_add_rsrc(dir.procdir, &ent);
			break;
		default:
			pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
				ent.type, ent.data);
			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 0);
		}
	}
	return 0;
}

static void __init nubus_add_board(int slot, int bytelanes)
{
	struct nubus_board *board;
	unsigned char *rp;
	unsigned long dpat;
	struct nubus_dir dir;
	struct nubus_dirent ent;
	int prev_resid = -1;

	/* Move to the start of the format block */
	rp = nubus_rom_addr(slot);
	nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes);

	/* Actually we should probably panic if this fails */
	if ((board = kzalloc(sizeof(*board), GFP_ATOMIC)) == NULL)
		return;
	board->fblock = rp;

	/* Dump the format block for debugging purposes */
	pr_debug("Slot %X, format block at 0x%p:\n", slot, rp);
	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
	rp = board->fblock;

	board->slot = slot;
	board->slot_addr = (unsigned long)nubus_slot_addr(slot);
	board->doffset = nubus_get_rom(&rp, 4, bytelanes);
	/* rom_length is *supposed* to be the total length of the
	 * ROM.  In practice it is the "amount of ROM used to compute
	 * the CRC."  So some jokers decide to set it to zero and
	 * set the crc to zero so they don't have to do any math.
	 * See the Performa 460 ROM, for example.  Those Apple "engineers".
	 */
	board->rom_length = nubus_get_rom(&rp, 4, bytelanes);
	board->crc = nubus_get_rom(&rp, 4, bytelanes);
	board->rev = nubus_get_rom(&rp, 1, bytelanes);
	board->format = nubus_get_rom(&rp, 1, bytelanes);
	board->lanes = bytelanes;

	/* Directory offset should be small and negative... */
	if (!(board->doffset & 0x00FF0000))
		pr_warn("Slot %X: Dodgy doffset!\n", slot);
	dpat = nubus_get_rom(&rp, 4, bytelanes);
	if (dpat != NUBUS_TEST_PATTERN)
		pr_warn("Slot %X: Wrong test pattern %08lx!\n", slot, dpat);

	/*
	 *	I wonder how the CRC is meant to work -
	 *		any takers ?
	 * CSA: According to MAC docs, not all cards pass the CRC anyway,
	 * since the initial Macintosh ROM releases skipped the check.
	 */

	/* Set up the directory pointer */
	board->directory = board->fblock;
	nubus_move(&board->directory, nubus_expand32(board->doffset),
	           board->lanes);

	nubus_get_root_dir(board, &dir);

	/* We're ready to rock */
	pr_debug("Slot %X resources:\n", slot);

	/* Each slot should have one board resource and any number of
	 * functional resources.  So we'll fill in some fields in the
	 * struct nubus_board from the board resource, then walk down
	 * the list of functional resources, spinning out a nubus_rsrc
	 * for each of them.
	 */
	if (nubus_readdir(&dir, &ent) == -1) {
		/* We can't have this! */
		pr_err("Slot %X: Board resource not found!\n", slot);
		kfree(board);
		return;
	}

	if (ent.type < 1 || ent.type > 127)
		pr_warn("Slot %X: Board resource ID is invalid!\n", slot);

	board->procdir = nubus_proc_add_board(board);

	nubus_get_board_resource(board, slot, &ent);

	while (nubus_readdir(&dir, &ent) != -1) {
		struct nubus_rsrc *fres;

		fres = nubus_get_functional_resource(board, slot, &ent);
		if (fres == NULL)
			continue;

		/* Resources should appear in ascending ID order. This sanity
		 * check prevents duplicate resource IDs.
		 */
		if (fres->resid <= prev_resid) {
			kfree(fres);
			continue;
		}
		prev_resid = fres->resid;

		list_add_tail(&fres->list, &nubus_func_rsrcs);
	}

	if (nubus_device_register(board))
		put_device(&board->dev);
}

static void __init nubus_probe_slot(int slot)
{
	unsigned char dp;
	unsigned char *rp;
	int i;

	rp = nubus_rom_addr(slot);
	for (i = 4; i; i--) {
		rp--;
		if (!hwreg_present(rp))
			continue;

		dp = *rp;

		/* The last byte of the format block consists of two
		   nybbles which are "mirror images" of each other.
		   These show us the valid bytelanes */
		if ((((dp >> 4) ^ dp) & 0x0F) != 0x0F)
			continue;
		/* Check that this value is actually *on* one of the
		   bytelanes it claims are valid! */
		if (not_useful(rp, dp))
			continue;

		/* Looks promising.  Let's put it on the list. */
		nubus_add_board(slot, dp);

		return;
	}
}

static void __init nubus_scan_bus(void)
{
	int slot;

	pr_info("NuBus: Scanning NuBus slots.\n");
	for (slot = 9; slot < 15; slot++) {
		nubus_probe_slot(slot);
	}
}

static int __init nubus_init(void)
{
	int err;

	if (!MACH_IS_MAC)
		return 0;

	nubus_proc_init();
	err = nubus_bus_register();
	if (err)
		return err;
	nubus_scan_bus();
	return 0;
}

subsys_initcall(nubus_init);

Privacy Policy