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1/*
2 * Macintosh Nubus Interface Code
3 *
4 * Originally by Alan Cox
5 *
6 * Mostly rewritten by David Huggins-Daines, C. Scott Ananian,
7 * and others.
8 */
9
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/nubus.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <asm/setup.h>
20#include <asm/system.h>
21#include <asm/page.h>
22#include <asm/hwtest.h>
23#include <linux/proc_fs.h>
24#include <asm/mac_via.h>
25#include <asm/mac_oss.h>
26
27extern void via_nubus_init(void);
28extern void oss_nubus_init(void);
29
30/* Constants */
31
32/* This is, of course, the size in bytelanes, rather than the size in
33 actual bytes */
34#define FORMAT_BLOCK_SIZE 20
35#define ROM_DIR_OFFSET 0x24
36
37#define NUBUS_TEST_PATTERN 0x5A932BC7
38
39/* Define this if you like to live dangerously - it is known not to
40 work on pretty much every machine except the Quadra 630 and the LC
41 III. */
42#undef I_WANT_TO_PROBE_SLOT_ZERO
43
44/* This sometimes helps combat failure to boot */
45#undef TRY_TO_DODGE_WSOD
46
47/* Globals */
48
49struct nubus_dev* nubus_devices;
50struct nubus_board* nubus_boards;
51
52/* Meaning of "bytelanes":
53
54 The card ROM may appear on any or all bytes of each long word in
55 NuBus memory. The low 4 bits of the "map" value found in the
56 format block (at the top of the slot address space, as well as at
57 the top of the MacOS ROM) tells us which bytelanes, i.e. which byte
58 offsets within each longword, are valid. Thus:
59
60 A map of 0x0f, as found in the MacOS ROM, means that all bytelanes
61 are valid.
62
63 A map of 0xf0 means that no bytelanes are valid (We pray that we
64 will never encounter this, but stranger things have happened)
65
66 A map of 0xe1 means that only the MSB of each long word is actually
67 part of the card ROM. (We hope to never encounter NuBus on a
68 little-endian machine. Again, stranger things have happened)
69
70 A map of 0x78 means that only the LSB of each long word is valid.
71
72 Etcetera, etcetera. Hopefully this clears up some confusion over
73 what the following code actually does. */
74
75static inline int not_useful(void *p, int map)
76{
77 unsigned long pv=(unsigned long)p;
78 pv &= 3;
79 if(map & (1<<pv))
80 return 0;
81 return 1;
82}
83
84static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map)
85{
86 /* This will hold the result */
87 unsigned long v = 0;
88 unsigned char *p = *ptr;
89
90 while(len)
91 {
92 v <<= 8;
93 while(not_useful(p,map))
94 p++;
95 v |= *p++;
96 len--;
97 }
98 *ptr = p;
99 return v;
100}
101
102static void nubus_rewind(unsigned char **ptr, int len, int map)
103{
104 unsigned char *p=*ptr;
105
106 /* Sanity check */
107 if(len > 65536)
108 printk(KERN_ERR "rewind of 0x%08x!\n", len);
109 while(len)
110 {
111 do
112 {
113 p--;
114 }
115 while(not_useful(p, map));
116 len--;
117 }
118 *ptr=p;
119}
120
121static void nubus_advance(unsigned char **ptr, int len, int map)
122{
123 unsigned char *p = *ptr;
124 if(len>65536)
125 printk(KERN_ERR "advance of 0x%08x!\n", len);
126 while(len)
127 {
128 while(not_useful(p,map))
129 p++;
130 p++;
131 len--;
132 }
133 *ptr = p;
134}
135
136static void nubus_move(unsigned char **ptr, int len, int map)
137{
138 if(len > 0)
139 nubus_advance(ptr, len, map);
140 else if(len < 0)
141 nubus_rewind(ptr, -len, map);
142}
143
144/* Now, functions to read the sResource tree */
145
146/* Each sResource entry consists of a 1-byte ID and a 3-byte data
147 field. If that data field contains an offset, then obviously we
148 have to expand it from a 24-bit signed number to a 32-bit signed
149 number. */
150
151static inline long nubus_expand32(long foo)
152{
153 if(foo & 0x00800000) /* 24bit negative */
154 foo |= 0xFF000000;
155 return foo;
156}
157
158static inline void *nubus_rom_addr(int slot)
159{
160 /*
161 * Returns the first byte after the card. We then walk
162 * backwards to get the lane register and the config
163 */
164 return (void *)(0xF1000000+(slot<<24));
165}
166
167static unsigned char *nubus_dirptr(const struct nubus_dirent *nd)
168{
169 unsigned char *p = nd->base;
170 /* Essentially, just step over the bytelanes using whatever
171 offset we might have found */
172 nubus_move(&p, nubus_expand32(nd->data), nd->mask);
173 /* And return the value */
174 return p;
175}
176
177/* These two are for pulling resource data blocks (i.e. stuff that's
178 pointed to with offsets) out of the card ROM. */
179
180void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent* dirent,
181 int len)
182{
183 unsigned char *t = (unsigned char *)dest;
184 unsigned char *p = nubus_dirptr(dirent);
185 while(len)
186 {
187 *t++ = nubus_get_rom(&p, 1, dirent->mask);
188 len--;
189 }
190}
191EXPORT_SYMBOL(nubus_get_rsrc_mem);
192
193void nubus_get_rsrc_str(void *dest, const struct nubus_dirent* dirent,
194 int len)
195{
196 unsigned char *t=(unsigned char *)dest;
197 unsigned char *p = nubus_dirptr(dirent);
198 while(len)
199 {
200 *t = nubus_get_rom(&p, 1, dirent->mask);
201 if(!*t++)
202 break;
203 len--;
204 }
205}
206EXPORT_SYMBOL(nubus_get_rsrc_str);
207
208int nubus_get_root_dir(const struct nubus_board* board,
209 struct nubus_dir* dir)
210{
211 dir->ptr = dir->base = board->directory;
212 dir->done = 0;
213 dir->mask = board->lanes;
214 return 0;
215}
216EXPORT_SYMBOL(nubus_get_root_dir);
217
218/* This is a slyly renamed version of the above */
219int nubus_get_func_dir(const struct nubus_dev* dev,
220 struct nubus_dir* dir)
221{
222 dir->ptr = dir->base = dev->directory;
223 dir->done = 0;
224 dir->mask = dev->board->lanes;
225 return 0;
226}
227EXPORT_SYMBOL(nubus_get_func_dir);
228
229int nubus_get_board_dir(const struct nubus_board* board,
230 struct nubus_dir* dir)
231{
232 struct nubus_dirent ent;
233
234 dir->ptr = dir->base = board->directory;
235 dir->done = 0;
236 dir->mask = board->lanes;
237
238 /* Now dereference it (the first directory is always the board
239 directory) */
240 if (nubus_readdir(dir, &ent) == -1)
241 return -1;
242 if (nubus_get_subdir(&ent, dir) == -1)
243 return -1;
244 return 0;
245}
246EXPORT_SYMBOL(nubus_get_board_dir);
247
248int nubus_get_subdir(const struct nubus_dirent *ent,
249 struct nubus_dir *dir)
250{
251 dir->ptr = dir->base = nubus_dirptr(ent);
252 dir->done = 0;
253 dir->mask = ent->mask;
254 return 0;
255}
256EXPORT_SYMBOL(nubus_get_subdir);
257
258int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent)
259{
260 u32 resid;
261 if (nd->done)
262 return -1;
263
264 /* Do this first, otherwise nubus_rewind & co are off by 4 */
265 ent->base = nd->ptr;
266
267 /* This moves nd->ptr forward */
268 resid = nubus_get_rom(&nd->ptr, 4, nd->mask);
269
270 /* EOL marker, as per the Apple docs */
271 if((resid&0xff000000) == 0xff000000)
272 {
273 /* Mark it as done */
274 nd->done = 1;
275 return -1;
276 }
277
278 /* First byte is the resource ID */
279 ent->type = resid >> 24;
280 /* Low 3 bytes might contain data (or might not) */
281 ent->data = resid & 0xffffff;
282 ent->mask = nd->mask;
283 return 0;
284}
285EXPORT_SYMBOL(nubus_readdir);
286
287int nubus_rewinddir(struct nubus_dir* dir)
288{
289 dir->ptr = dir->base;
290 return 0;
291}
292EXPORT_SYMBOL(nubus_rewinddir);
293
294/* Driver interface functions, more or less like in pci.c */
295
296struct nubus_dev*
297nubus_find_device(unsigned short category,
298 unsigned short type,
299 unsigned short dr_hw,
300 unsigned short dr_sw,
301 const struct nubus_dev* from)
302{
303 struct nubus_dev* itor =
304 from ? from->next : nubus_devices;
305
306 while (itor) {
307 if (itor->category == category
308 && itor->type == type
309 && itor->dr_hw == dr_hw
310 && itor->dr_sw == dr_sw)
311 return itor;
312 itor = itor->next;
313 }
314 return NULL;
315}
316EXPORT_SYMBOL(nubus_find_device);
317
318struct nubus_dev*
319nubus_find_type(unsigned short category,
320 unsigned short type,
321 const struct nubus_dev* from)
322{
323 struct nubus_dev* itor =
324 from ? from->next : nubus_devices;
325
326 while (itor) {
327 if (itor->category == category
328 && itor->type == type)
329 return itor;
330 itor = itor->next;
331 }
332 return NULL;
333}
334EXPORT_SYMBOL(nubus_find_type);
335
336struct nubus_dev*
337nubus_find_slot(unsigned int slot,
338 const struct nubus_dev* from)
339{
340 struct nubus_dev* itor =
341 from ? from->next : nubus_devices;
342
343 while (itor) {
344 if (itor->board->slot == slot)
345 return itor;
346 itor = itor->next;
347 }
348 return NULL;
349}
350EXPORT_SYMBOL(nubus_find_slot);
351
352int
353nubus_find_rsrc(struct nubus_dir* dir, unsigned char rsrc_type,
354 struct nubus_dirent* ent)
355{
356 while (nubus_readdir(dir, ent) != -1) {
357 if (ent->type == rsrc_type)
358 return 0;
359 }
360 return -1;
361}
362EXPORT_SYMBOL(nubus_find_rsrc);
363
364/* Initialization functions - decide which slots contain stuff worth
365 looking at, and print out lots and lots of information from the
366 resource blocks. */
367
368/* FIXME: A lot of this stuff will eventually be useful after
369 initialization, for intelligently probing Ethernet and video chips,
370 among other things. The rest of it should go in the /proc code.
371 For now, we just use it to give verbose boot logs. */
372
373static int __init nubus_show_display_resource(struct nubus_dev* dev,
374 const struct nubus_dirent* ent)
375{
376 switch (ent->type) {
377 case NUBUS_RESID_GAMMADIR:
378 printk(KERN_INFO " gamma directory offset: 0x%06x\n", ent->data);
379 break;
380 case 0x0080 ... 0x0085:
381 printk(KERN_INFO " mode %02X info offset: 0x%06x\n",
382 ent->type, ent->data);
383 break;
384 default:
385 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
386 ent->type, ent->data);
387 }
388 return 0;
389}
390
391static int __init nubus_show_network_resource(struct nubus_dev* dev,
392 const struct nubus_dirent* ent)
393{
394 switch (ent->type) {
395 case NUBUS_RESID_MAC_ADDRESS:
396 {
397 char addr[6];
398 int i;
399
400 nubus_get_rsrc_mem(addr, ent, 6);
401 printk(KERN_INFO " MAC address: ");
402 for (i = 0; i < 6; i++)
403 printk("%02x%s", addr[i] & 0xff,
404 i == 5 ? "" : ":");
405 printk("\n");
406 break;
407 }
408 default:
409 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
410 ent->type, ent->data);
411 }
412 return 0;
413}
414
415static int __init nubus_show_cpu_resource(struct nubus_dev* dev,
416 const struct nubus_dirent* ent)
417{
418 switch (ent->type) {
419 case NUBUS_RESID_MEMINFO:
420 {
421 unsigned long meminfo[2];
422 nubus_get_rsrc_mem(&meminfo, ent, 8);
423 printk(KERN_INFO " memory: [ 0x%08lx 0x%08lx ]\n",
424 meminfo[0], meminfo[1]);
425 break;
426 }
427 case NUBUS_RESID_ROMINFO:
428 {
429 unsigned long rominfo[2];
430 nubus_get_rsrc_mem(&rominfo, ent, 8);
431 printk(KERN_INFO " ROM: [ 0x%08lx 0x%08lx ]\n",
432 rominfo[0], rominfo[1]);
433 break;
434 }
435 default:
436 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
437 ent->type, ent->data);
438 }
439 return 0;
440}
441
442static int __init nubus_show_private_resource(struct nubus_dev* dev,
443 const struct nubus_dirent* ent)
444{
445 switch (dev->category) {
446 case NUBUS_CAT_DISPLAY:
447 nubus_show_display_resource(dev, ent);
448 break;
449 case NUBUS_CAT_NETWORK:
450 nubus_show_network_resource(dev, ent);
451 break;
452 case NUBUS_CAT_CPU:
453 nubus_show_cpu_resource(dev, ent);
454 break;
455 default:
456 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
457 ent->type, ent->data);
458 }
459 return 0;
460}
461
462static struct nubus_dev* __init
463 nubus_get_functional_resource(struct nubus_board* board,
464 int slot,
465 const struct nubus_dirent* parent)
466{
467 struct nubus_dir dir;
468 struct nubus_dirent ent;
469 struct nubus_dev* dev;
470
471 printk(KERN_INFO " Function 0x%02x:\n", parent->type);
472 nubus_get_subdir(parent, &dir);
473
474 /* Apple seems to have botched the ROM on the IIx */
475 if (slot == 0 && (unsigned long)dir.base % 2)
476 dir.base += 1;
477
478 if (console_loglevel >= 10)
479 printk(KERN_DEBUG "nubus_get_functional_resource: parent is 0x%p, dir is 0x%p\n",
480 parent->base, dir.base);
481
482 /* Actually we should probably panic if this fails */
483 if ((dev = kzalloc(sizeof(*dev), GFP_ATOMIC)) == NULL)
484 return NULL;
485 dev->resid = parent->type;
486 dev->directory = dir.base;
487 dev->board = board;
488
489 while (nubus_readdir(&dir, &ent) != -1)
490 {
491 switch(ent.type)
492 {
493 case NUBUS_RESID_TYPE:
494 {
495 unsigned short nbtdata[4];
496 nubus_get_rsrc_mem(nbtdata, &ent, 8);
497 dev->category = nbtdata[0];
498 dev->type = nbtdata[1];
499 dev->dr_sw = nbtdata[2];
500 dev->dr_hw = nbtdata[3];
501 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
502 nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
503 break;
504 }
505 case NUBUS_RESID_NAME:
506 {
507 nubus_get_rsrc_str(dev->name, &ent, 64);
508 printk(KERN_INFO " name: %s\n", dev->name);
509 break;
510 }
511 case NUBUS_RESID_DRVRDIR:
512 {
513 /* MacOS driver. If we were NetBSD we might
514 use this :-) */
515 struct nubus_dir drvr_dir;
516 struct nubus_dirent drvr_ent;
517 nubus_get_subdir(&ent, &drvr_dir);
518 nubus_readdir(&drvr_dir, &drvr_ent);
519 dev->driver = nubus_dirptr(&drvr_ent);
520 printk(KERN_INFO " driver at: 0x%p\n",
521 dev->driver);
522 break;
523 }
524 case NUBUS_RESID_MINOR_BASEOS:
525 /* We will need this in order to support
526 multiple framebuffers. It might be handy
527 for Ethernet as well */
528 nubus_get_rsrc_mem(&dev->iobase, &ent, 4);
529 printk(KERN_INFO " memory offset: 0x%08lx\n",
530 dev->iobase);
531 break;
532 case NUBUS_RESID_MINOR_LENGTH:
533 /* Ditto */
534 nubus_get_rsrc_mem(&dev->iosize, &ent, 4);
535 printk(KERN_INFO " memory length: 0x%08lx\n",
536 dev->iosize);
537 break;
538 case NUBUS_RESID_FLAGS:
539 dev->flags = ent.data;
540 printk(KERN_INFO " flags: 0x%06x\n", dev->flags);
541 break;
542 case NUBUS_RESID_HWDEVID:
543 dev->hwdevid = ent.data;
544 printk(KERN_INFO " hwdevid: 0x%06x\n", dev->hwdevid);
545 break;
546 default:
547 /* Local/Private resources have their own
548 function */
549 nubus_show_private_resource(dev, &ent);
550 }
551 }
552
553 return dev;
554}
555
556/* This is cool. */
557static int __init nubus_get_vidnames(struct nubus_board* board,
558 const struct nubus_dirent* parent)
559{
560 struct nubus_dir dir;
561 struct nubus_dirent ent;
562 /* FIXME: obviously we want to put this in a header file soon */
563 struct vidmode {
564 u32 size;
565 /* Don't know what this is yet */
566 u16 id;
567 /* Longest one I've seen so far is 26 characters */
568 char name[32];
569 };
570
571 printk(KERN_INFO " video modes supported:\n");
572 nubus_get_subdir(parent, &dir);
573 if (console_loglevel >= 10)
574 printk(KERN_DEBUG "nubus_get_vidnames: parent is 0x%p, dir is 0x%p\n",
575 parent->base, dir.base);
576
577 while(nubus_readdir(&dir, &ent) != -1)
578 {
579 struct vidmode mode;
580 u32 size;
581
582 /* First get the length */
583 nubus_get_rsrc_mem(&size, &ent, 4);
584
585 /* Now clobber the whole thing */
586 if (size > sizeof(mode) - 1)
587 size = sizeof(mode) - 1;
588 memset(&mode, 0, sizeof(mode));
589 nubus_get_rsrc_mem(&mode, &ent, size);
590 printk (KERN_INFO " %02X: (%02X) %s\n", ent.type,
591 mode.id, mode.name);
592 }
593 return 0;
594}
595
596/* This is *really* cool. */
597static int __init nubus_get_icon(struct nubus_board* board,
598 const struct nubus_dirent* ent)
599{
600 /* Should be 32x32 if my memory serves me correctly */
601 unsigned char icon[128];
602 int x, y;
603
604 nubus_get_rsrc_mem(&icon, ent, 128);
605 printk(KERN_INFO " icon:\n");
606
607 /* We should actually plot these somewhere in the framebuffer
608 init. This is just to demonstrate that they do, in fact,
609 exist */
610 for (y = 0; y < 32; y++) {
611 printk(KERN_INFO " ");
612 for (x = 0; x < 32; x++) {
613 if (icon[y*4 + x/8]
614 & (0x80 >> (x%8)))
615 printk("*");
616 else
617 printk(" ");
618 }
619 printk("\n");
620 }
621 return 0;
622}
623
624static int __init nubus_get_vendorinfo(struct nubus_board* board,
625 const struct nubus_dirent* parent)
626{
627 struct nubus_dir dir;
628 struct nubus_dirent ent;
629 static char* vendor_fields[6] = {"ID", "serial", "revision",
630 "part", "date", "unknown field"};
631
632 printk(KERN_INFO " vendor info:\n");
633 nubus_get_subdir(parent, &dir);
634 if (console_loglevel >= 10)
635 printk(KERN_DEBUG "nubus_get_vendorinfo: parent is 0x%p, dir is 0x%p\n",
636 parent->base, dir.base);
637
638 while(nubus_readdir(&dir, &ent) != -1)
639 {
640 char name[64];
641
642 /* These are all strings, we think */
643 nubus_get_rsrc_str(name, &ent, 64);
644 if (ent.type > 5)
645 ent.type = 5;
646 printk(KERN_INFO " %s: %s\n",
647 vendor_fields[ent.type-1], name);
648 }
649 return 0;
650}
651
652static int __init nubus_get_board_resource(struct nubus_board* board, int slot,
653 const struct nubus_dirent* parent)
654{
655 struct nubus_dir dir;
656 struct nubus_dirent ent;
657
658 nubus_get_subdir(parent, &dir);
659 if (console_loglevel >= 10)
660 printk(KERN_DEBUG "nubus_get_board_resource: parent is 0x%p, dir is 0x%p\n",
661 parent->base, dir.base);
662
663 while(nubus_readdir(&dir, &ent) != -1)
664 {
665 switch (ent.type) {
666 case NUBUS_RESID_TYPE:
667 {
668 unsigned short nbtdata[4];
669 /* This type is always the same, and is not
670 useful except insofar as it tells us that
671 we really are looking at a board resource. */
672 nubus_get_rsrc_mem(nbtdata, &ent, 8);
673 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
674 nbtdata[0], nbtdata[1], nbtdata[2],
675 nbtdata[3]);
676 if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
677 nbtdata[2] != 0 || nbtdata[3] != 0)
678 printk(KERN_ERR "this sResource is not a board resource!\n");
679 break;
680 }
681 case NUBUS_RESID_NAME:
682 nubus_get_rsrc_str(board->name, &ent, 64);
683 printk(KERN_INFO " name: %s\n", board->name);
684 break;
685 case NUBUS_RESID_ICON:
686 nubus_get_icon(board, &ent);
687 break;
688 case NUBUS_RESID_BOARDID:
689 printk(KERN_INFO " board id: 0x%x\n", ent.data);
690 break;
691 case NUBUS_RESID_PRIMARYINIT:
692 printk(KERN_INFO " primary init offset: 0x%06x\n", ent.data);
693 break;
694 case NUBUS_RESID_VENDORINFO:
695 nubus_get_vendorinfo(board, &ent);
696 break;
697 case NUBUS_RESID_FLAGS:
698 printk(KERN_INFO " flags: 0x%06x\n", ent.data);
699 break;
700 case NUBUS_RESID_HWDEVID:
701 printk(KERN_INFO " hwdevid: 0x%06x\n", ent.data);
702 break;
703 case NUBUS_RESID_SECONDINIT:
704 printk(KERN_INFO " secondary init offset: 0x%06x\n", ent.data);
705 break;
706 /* WTF isn't this in the functional resources? */
707 case NUBUS_RESID_VIDNAMES:
708 nubus_get_vidnames(board, &ent);
709 break;
710 /* Same goes for this */
711 case NUBUS_RESID_VIDMODES:
712 printk(KERN_INFO " video mode parameter directory offset: 0x%06x\n",
713 ent.data);
714 break;
715 default:
716 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
717 ent.type, ent.data);
718 }
719 }
720 return 0;
721}
722
723/* Attempt to bypass the somewhat non-obvious arrangement of
724 sResources in the motherboard ROM */
725static void __init nubus_find_rom_dir(struct nubus_board* board)
726{
727 unsigned char* rp;
728 unsigned char* romdir;
729 struct nubus_dir dir;
730 struct nubus_dirent ent;
731
732 /* Check for the extra directory just under the format block */
733 rp = board->fblock;
734 nubus_rewind(&rp, 4, board->lanes);
735 if (nubus_get_rom(&rp, 4, board->lanes) != NUBUS_TEST_PATTERN) {
736 /* OK, the ROM was telling the truth */
737 board->directory = board->fblock;
738 nubus_move(&board->directory,
739 nubus_expand32(board->doffset),
740 board->lanes);
741 return;
742 }
743
744 /* On "slot zero", you have to walk down a few more
745 directories to get to the equivalent of a real card's root
746 directory. We don't know what they were smoking when they
747 came up with this. */
748 romdir = nubus_rom_addr(board->slot);
749 nubus_rewind(&romdir, ROM_DIR_OFFSET, board->lanes);
750 dir.base = dir.ptr = romdir;
751 dir.done = 0;
752 dir.mask = board->lanes;
753
754 /* This one points to an "Unknown Macintosh" directory */
755 if (nubus_readdir(&dir, &ent) == -1)
756 goto badrom;
757
758 if (console_loglevel >= 10)
759 printk(KERN_INFO "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
760 /* This one takes us to where we want to go. */
761 if (nubus_readdir(&dir, &ent) == -1)
762 goto badrom;
763 if (console_loglevel >= 10)
764 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
765 nubus_get_subdir(&ent, &dir);
766
767 /* Resource ID 01, also an "Unknown Macintosh" */
768 if (nubus_readdir(&dir, &ent) == -1)
769 goto badrom;
770 if (console_loglevel >= 10)
771 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
772
773 /* FIXME: the first one is *not* always the right one. We
774 suspect this has something to do with the ROM revision.
775 "The HORROR ROM" (LC-series) uses 0x7e, while "The HORROR
776 Continues" (Q630) uses 0x7b. The DAFB Macs evidently use
777 something else. Please run "Slots" on your Mac (see
778 include/linux/nubus.h for where to get this program) and
779 tell us where the 'SiDirPtr' for Slot 0 is. If you feel
780 brave, you should also use MacsBug to walk down the ROM
781 directories like this function does and try to find the
782 path to that address... */
783 if (nubus_readdir(&dir, &ent) == -1)
784 goto badrom;
785 if (console_loglevel >= 10)
786 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
787
788 /* Bwahahahaha... */
789 nubus_get_subdir(&ent, &dir);
790 board->directory = dir.base;
791 return;
792
793 /* Even more evil laughter... */
794 badrom:
795 board->directory = board->fblock;
796 nubus_move(&board->directory, nubus_expand32(board->doffset), board->lanes);
797 printk(KERN_ERR "nubus_get_rom_dir: ROM weirdness! Notify the developers...\n");
798}
799
800/* Add a board (might be many devices) to the list */
801static struct nubus_board* __init nubus_add_board(int slot, int bytelanes)
802{
803 struct nubus_board* board;
804 struct nubus_board** boardp;
805
806 unsigned char *rp;
807 unsigned long dpat;
808 struct nubus_dir dir;
809 struct nubus_dirent ent;
810
811 /* Move to the start of the format block */
812 rp = nubus_rom_addr(slot);
813 nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes);
814
815 /* Actually we should probably panic if this fails */
816 if ((board = kzalloc(sizeof(*board), GFP_ATOMIC)) == NULL)
817 return NULL;
818 board->fblock = rp;
819
820 /* Dump the format block for debugging purposes */
821 if (console_loglevel >= 10) {
822 int i;
823 printk(KERN_DEBUG "Slot %X, format block at 0x%p\n",
824 slot, rp);
825 printk(KERN_DEBUG "Format block: ");
826 for (i = 0; i < FORMAT_BLOCK_SIZE; i += 4) {
827 unsigned short foo, bar;
828 foo = nubus_get_rom(&rp, 2, bytelanes);
829 bar = nubus_get_rom(&rp, 2, bytelanes);
830 printk("%04x %04x ", foo, bar);
831 }
832 printk("\n");
833 rp = board->fblock;
834 }
835
836 board->slot = slot;
837 board->slot_addr = (unsigned long) nubus_slot_addr(slot);
838 board->doffset = nubus_get_rom(&rp, 4, bytelanes);
839 /* rom_length is *supposed* to be the total length of the
840 * ROM. In practice it is the "amount of ROM used to compute
841 * the CRC." So some jokers decide to set it to zero and
842 * set the crc to zero so they don't have to do any math.
843 * See the Performa 460 ROM, for example. Those Apple "engineers".
844 */
845 board->rom_length = nubus_get_rom(&rp, 4, bytelanes);
846 board->crc = nubus_get_rom(&rp, 4, bytelanes);
847 board->rev = nubus_get_rom(&rp, 1, bytelanes);
848 board->format = nubus_get_rom(&rp,1, bytelanes);
849 board->lanes = bytelanes;
850
851 /* Directory offset should be small and negative... */
852 if(!(board->doffset & 0x00FF0000))
853 printk(KERN_WARNING "Dodgy doffset!\n");
854 dpat = nubus_get_rom(&rp, 4, bytelanes);
855 if(dpat != NUBUS_TEST_PATTERN)
856 printk(KERN_WARNING "Wrong test pattern %08lx!\n", dpat);
857
858 /*
859 * I wonder how the CRC is meant to work -
860 * any takers ?
861 * CSA: According to MAC docs, not all cards pass the CRC anyway,
862 * since the initial Macintosh ROM releases skipped the check.
863 */
864
865 /* Attempt to work around slot zero weirdness */
866 nubus_find_rom_dir(board);
867 nubus_get_root_dir(board, &dir);
868
869 /* We're ready to rock */
870 printk(KERN_INFO "Slot %X:\n", slot);
871
872 /* Each slot should have one board resource and any number of
873 functional resources. So we'll fill in some fields in the
874 struct nubus_board from the board resource, then walk down
875 the list of functional resources, spinning out a nubus_dev
876 for each of them. */
877 if (nubus_readdir(&dir, &ent) == -1) {
878 /* We can't have this! */
879 printk(KERN_ERR "Board resource not found!\n");
880 return NULL;
881 } else {
882 printk(KERN_INFO " Board resource:\n");
883 nubus_get_board_resource(board, slot, &ent);
884 }
885
886 /* Aaaarrrrgghh! The LC III motherboard has *two* board
887 resources. I have no idea WTF to do about this. */
888
889 while (nubus_readdir(&dir, &ent) != -1) {
890 struct nubus_dev* dev;
891 struct nubus_dev** devp;
892 dev = nubus_get_functional_resource(board, slot, &ent);
893 if (dev == NULL)
894 continue;
895
896 /* We zeroed this out above */
897 if (board->first_dev == NULL)
898 board->first_dev = dev;
899
900 /* Put it on the global NuBus device chain. Keep entries in order. */
901 for (devp=&nubus_devices; *devp!=NULL; devp=&((*devp)->next))
902 /* spin */;
903 *devp = dev;
904 dev->next = NULL;
905 }
906
907 /* Put it on the global NuBus board chain. Keep entries in order. */
908 for (boardp=&nubus_boards; *boardp!=NULL; boardp=&((*boardp)->next))
909 /* spin */;
910 *boardp = board;
911 board->next = NULL;
912
913 return board;
914}
915
916void __init nubus_probe_slot(int slot)
917{
918 unsigned char dp;
919 unsigned char* rp;
920 int i;
921
922 rp = nubus_rom_addr(slot);
923 for(i = 4; i; i--)
924 {
925 unsigned long flags;
926 int card_present;
927
928 rp--;
929 local_irq_save(flags);
930 card_present = hwreg_present(rp);
931 local_irq_restore(flags);
932
933 if (!card_present)
934 continue;
935
936 printk(KERN_DEBUG "Now probing slot %X at %p\n", slot, rp);
937 dp = *rp;
938 if(dp == 0)
939 continue;
940
941 /* The last byte of the format block consists of two
942 nybbles which are "mirror images" of each other.
943 These show us the valid bytelanes */
944 if ((((dp>>4) ^ dp) & 0x0F) != 0x0F)
945 continue;
946 /* Check that this value is actually *on* one of the
947 bytelanes it claims are valid! */
948 if ((dp & 0x0F) >= (1<<i))
949 continue;
950
951 /* Looks promising. Let's put it on the list. */
952 nubus_add_board(slot, dp);
953
954 return;
955 }
956}
957
958#if defined(CONFIG_PROC_FS)
959
960/* /proc/nubus stuff */
961
962static int sprint_nubus_board(struct nubus_board* board, char* ptr, int len)
963{
964 if(len < 100)
965 return -1;
966
967 sprintf(ptr, "Slot %X: %s\n",
968 board->slot, board->name);
969
970 return strlen(ptr);
971}
972
973static int nubus_read_proc(char *page, char **start, off_t off,
974 int count, int *eof, void *data)
975{
976 int nprinted, len, begin = 0;
977 int size = PAGE_SIZE;
978 struct nubus_board* board;
979
980 len = sprintf(page, "Nubus devices found:\n");
981 /* Walk the list of NuBus boards */
982 for (board = nubus_boards; board != NULL; board = board->next)
983 {
984 nprinted = sprint_nubus_board(board, page + len, size - len);
985 if (nprinted < 0)
986 break;
987 len += nprinted;
988 if (len+begin < off) {
989 begin += len;
990 len = 0;
991 }
992 if (len+begin >= off+count)
993 break;
994 }
995 if (len+begin < off)
996 *eof = 1;
997 off -= begin;
998 *start = page + off;
999 len -= off;
1000 if (len>count)
1001 len = count;
1002 if (len<0)
1003 len = 0;
1004 return len;
1005}
1006#endif
1007
1008void __init nubus_scan_bus(void)
1009{
1010 int slot;
1011 /* This might not work on your machine */
1012#ifdef I_WANT_TO_PROBE_SLOT_ZERO
1013 nubus_probe_slot(0);
1014#endif
1015 for(slot = 9; slot < 15; slot++)
1016 {
1017 nubus_probe_slot(slot);
1018 }
1019}
1020
1021static int __init nubus_init(void)
1022{
1023 if (!MACH_IS_MAC)
1024 return 0;
1025
1026 /* Initialize the NuBus interrupts */
1027 if (oss_present) {
1028 oss_nubus_init();
1029 } else {
1030 via_nubus_init();
1031 }
1032
1033#ifdef TRY_TO_DODGE_WSOD
1034 /* Rogue Ethernet interrupts can kill the machine if we don't
1035 do this. Obviously this is bogus. Hopefully the local VIA
1036 gurus can fix the real cause of the problem. */
1037 mdelay(1000);
1038#endif
1039
1040 /* And probe */
1041 printk("NuBus: Scanning NuBus slots.\n");
1042 nubus_devices = NULL;
1043 nubus_boards = NULL;
1044 nubus_scan_bus();
1045
1046#ifdef CONFIG_PROC_FS
1047 create_proc_read_entry("nubus", 0, NULL, nubus_read_proc, NULL);
1048 nubus_proc_init();
1049#endif
1050 return 0;
1051}
1052
1053subsys_initcall(nubus_init);
1/*
2 * Macintosh Nubus Interface Code
3 *
4 * Originally by Alan Cox
5 *
6 * Mostly rewritten by David Huggins-Daines, C. Scott Ananian,
7 * and others.
8 */
9
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/nubus.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <asm/setup.h>
20#include <asm/page.h>
21#include <asm/hwtest.h>
22#include <asm/mac_via.h>
23#include <asm/mac_oss.h>
24
25extern void via_nubus_init(void);
26extern void oss_nubus_init(void);
27
28/* Constants */
29
30/* This is, of course, the size in bytelanes, rather than the size in
31 actual bytes */
32#define FORMAT_BLOCK_SIZE 20
33#define ROM_DIR_OFFSET 0x24
34
35#define NUBUS_TEST_PATTERN 0x5A932BC7
36
37/* Define this if you like to live dangerously - it is known not to
38 work on pretty much every machine except the Quadra 630 and the LC
39 III. */
40#undef I_WANT_TO_PROBE_SLOT_ZERO
41
42/* This sometimes helps combat failure to boot */
43#undef TRY_TO_DODGE_WSOD
44
45/* Globals */
46
47struct nubus_dev* nubus_devices;
48struct nubus_board* nubus_boards;
49
50/* Meaning of "bytelanes":
51
52 The card ROM may appear on any or all bytes of each long word in
53 NuBus memory. The low 4 bits of the "map" value found in the
54 format block (at the top of the slot address space, as well as at
55 the top of the MacOS ROM) tells us which bytelanes, i.e. which byte
56 offsets within each longword, are valid. Thus:
57
58 A map of 0x0f, as found in the MacOS ROM, means that all bytelanes
59 are valid.
60
61 A map of 0xf0 means that no bytelanes are valid (We pray that we
62 will never encounter this, but stranger things have happened)
63
64 A map of 0xe1 means that only the MSB of each long word is actually
65 part of the card ROM. (We hope to never encounter NuBus on a
66 little-endian machine. Again, stranger things have happened)
67
68 A map of 0x78 means that only the LSB of each long word is valid.
69
70 Etcetera, etcetera. Hopefully this clears up some confusion over
71 what the following code actually does. */
72
73static inline int not_useful(void *p, int map)
74{
75 unsigned long pv=(unsigned long)p;
76 pv &= 3;
77 if(map & (1<<pv))
78 return 0;
79 return 1;
80}
81
82static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map)
83{
84 /* This will hold the result */
85 unsigned long v = 0;
86 unsigned char *p = *ptr;
87
88 while(len)
89 {
90 v <<= 8;
91 while(not_useful(p,map))
92 p++;
93 v |= *p++;
94 len--;
95 }
96 *ptr = p;
97 return v;
98}
99
100static void nubus_rewind(unsigned char **ptr, int len, int map)
101{
102 unsigned char *p=*ptr;
103
104 /* Sanity check */
105 if(len > 65536)
106 printk(KERN_ERR "rewind of 0x%08x!\n", len);
107 while(len)
108 {
109 do
110 {
111 p--;
112 }
113 while(not_useful(p, map));
114 len--;
115 }
116 *ptr=p;
117}
118
119static void nubus_advance(unsigned char **ptr, int len, int map)
120{
121 unsigned char *p = *ptr;
122 if(len>65536)
123 printk(KERN_ERR "advance of 0x%08x!\n", len);
124 while(len)
125 {
126 while(not_useful(p,map))
127 p++;
128 p++;
129 len--;
130 }
131 *ptr = p;
132}
133
134static void nubus_move(unsigned char **ptr, int len, int map)
135{
136 if(len > 0)
137 nubus_advance(ptr, len, map);
138 else if(len < 0)
139 nubus_rewind(ptr, -len, map);
140}
141
142/* Now, functions to read the sResource tree */
143
144/* Each sResource entry consists of a 1-byte ID and a 3-byte data
145 field. If that data field contains an offset, then obviously we
146 have to expand it from a 24-bit signed number to a 32-bit signed
147 number. */
148
149static inline long nubus_expand32(long foo)
150{
151 if(foo & 0x00800000) /* 24bit negative */
152 foo |= 0xFF000000;
153 return foo;
154}
155
156static inline void *nubus_rom_addr(int slot)
157{
158 /*
159 * Returns the first byte after the card. We then walk
160 * backwards to get the lane register and the config
161 */
162 return (void *)(0xF1000000+(slot<<24));
163}
164
165static unsigned char *nubus_dirptr(const struct nubus_dirent *nd)
166{
167 unsigned char *p = nd->base;
168 /* Essentially, just step over the bytelanes using whatever
169 offset we might have found */
170 nubus_move(&p, nubus_expand32(nd->data), nd->mask);
171 /* And return the value */
172 return p;
173}
174
175/* These two are for pulling resource data blocks (i.e. stuff that's
176 pointed to with offsets) out of the card ROM. */
177
178void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent* dirent,
179 int len)
180{
181 unsigned char *t = (unsigned char *)dest;
182 unsigned char *p = nubus_dirptr(dirent);
183 while(len)
184 {
185 *t++ = nubus_get_rom(&p, 1, dirent->mask);
186 len--;
187 }
188}
189EXPORT_SYMBOL(nubus_get_rsrc_mem);
190
191void nubus_get_rsrc_str(void *dest, const struct nubus_dirent* dirent,
192 int len)
193{
194 unsigned char *t=(unsigned char *)dest;
195 unsigned char *p = nubus_dirptr(dirent);
196 while(len)
197 {
198 *t = nubus_get_rom(&p, 1, dirent->mask);
199 if(!*t++)
200 break;
201 len--;
202 }
203}
204EXPORT_SYMBOL(nubus_get_rsrc_str);
205
206int nubus_get_root_dir(const struct nubus_board* board,
207 struct nubus_dir* dir)
208{
209 dir->ptr = dir->base = board->directory;
210 dir->done = 0;
211 dir->mask = board->lanes;
212 return 0;
213}
214EXPORT_SYMBOL(nubus_get_root_dir);
215
216/* This is a slyly renamed version of the above */
217int nubus_get_func_dir(const struct nubus_dev* dev,
218 struct nubus_dir* dir)
219{
220 dir->ptr = dir->base = dev->directory;
221 dir->done = 0;
222 dir->mask = dev->board->lanes;
223 return 0;
224}
225EXPORT_SYMBOL(nubus_get_func_dir);
226
227int nubus_get_board_dir(const struct nubus_board* board,
228 struct nubus_dir* dir)
229{
230 struct nubus_dirent ent;
231
232 dir->ptr = dir->base = board->directory;
233 dir->done = 0;
234 dir->mask = board->lanes;
235
236 /* Now dereference it (the first directory is always the board
237 directory) */
238 if (nubus_readdir(dir, &ent) == -1)
239 return -1;
240 if (nubus_get_subdir(&ent, dir) == -1)
241 return -1;
242 return 0;
243}
244EXPORT_SYMBOL(nubus_get_board_dir);
245
246int nubus_get_subdir(const struct nubus_dirent *ent,
247 struct nubus_dir *dir)
248{
249 dir->ptr = dir->base = nubus_dirptr(ent);
250 dir->done = 0;
251 dir->mask = ent->mask;
252 return 0;
253}
254EXPORT_SYMBOL(nubus_get_subdir);
255
256int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent)
257{
258 u32 resid;
259 if (nd->done)
260 return -1;
261
262 /* Do this first, otherwise nubus_rewind & co are off by 4 */
263 ent->base = nd->ptr;
264
265 /* This moves nd->ptr forward */
266 resid = nubus_get_rom(&nd->ptr, 4, nd->mask);
267
268 /* EOL marker, as per the Apple docs */
269 if((resid&0xff000000) == 0xff000000)
270 {
271 /* Mark it as done */
272 nd->done = 1;
273 return -1;
274 }
275
276 /* First byte is the resource ID */
277 ent->type = resid >> 24;
278 /* Low 3 bytes might contain data (or might not) */
279 ent->data = resid & 0xffffff;
280 ent->mask = nd->mask;
281 return 0;
282}
283EXPORT_SYMBOL(nubus_readdir);
284
285int nubus_rewinddir(struct nubus_dir* dir)
286{
287 dir->ptr = dir->base;
288 return 0;
289}
290EXPORT_SYMBOL(nubus_rewinddir);
291
292/* Driver interface functions, more or less like in pci.c */
293
294struct nubus_dev*
295nubus_find_device(unsigned short category,
296 unsigned short type,
297 unsigned short dr_hw,
298 unsigned short dr_sw,
299 const struct nubus_dev* from)
300{
301 struct nubus_dev* itor =
302 from ? from->next : nubus_devices;
303
304 while (itor) {
305 if (itor->category == category
306 && itor->type == type
307 && itor->dr_hw == dr_hw
308 && itor->dr_sw == dr_sw)
309 return itor;
310 itor = itor->next;
311 }
312 return NULL;
313}
314EXPORT_SYMBOL(nubus_find_device);
315
316struct nubus_dev*
317nubus_find_type(unsigned short category,
318 unsigned short type,
319 const struct nubus_dev* from)
320{
321 struct nubus_dev* itor =
322 from ? from->next : nubus_devices;
323
324 while (itor) {
325 if (itor->category == category
326 && itor->type == type)
327 return itor;
328 itor = itor->next;
329 }
330 return NULL;
331}
332EXPORT_SYMBOL(nubus_find_type);
333
334struct nubus_dev*
335nubus_find_slot(unsigned int slot,
336 const struct nubus_dev* from)
337{
338 struct nubus_dev* itor =
339 from ? from->next : nubus_devices;
340
341 while (itor) {
342 if (itor->board->slot == slot)
343 return itor;
344 itor = itor->next;
345 }
346 return NULL;
347}
348EXPORT_SYMBOL(nubus_find_slot);
349
350int
351nubus_find_rsrc(struct nubus_dir* dir, unsigned char rsrc_type,
352 struct nubus_dirent* ent)
353{
354 while (nubus_readdir(dir, ent) != -1) {
355 if (ent->type == rsrc_type)
356 return 0;
357 }
358 return -1;
359}
360EXPORT_SYMBOL(nubus_find_rsrc);
361
362/* Initialization functions - decide which slots contain stuff worth
363 looking at, and print out lots and lots of information from the
364 resource blocks. */
365
366/* FIXME: A lot of this stuff will eventually be useful after
367 initialization, for intelligently probing Ethernet and video chips,
368 among other things. The rest of it should go in the /proc code.
369 For now, we just use it to give verbose boot logs. */
370
371static int __init nubus_show_display_resource(struct nubus_dev* dev,
372 const struct nubus_dirent* ent)
373{
374 switch (ent->type) {
375 case NUBUS_RESID_GAMMADIR:
376 printk(KERN_INFO " gamma directory offset: 0x%06x\n", ent->data);
377 break;
378 case 0x0080 ... 0x0085:
379 printk(KERN_INFO " mode %02X info offset: 0x%06x\n",
380 ent->type, ent->data);
381 break;
382 default:
383 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
384 ent->type, ent->data);
385 }
386 return 0;
387}
388
389static int __init nubus_show_network_resource(struct nubus_dev* dev,
390 const struct nubus_dirent* ent)
391{
392 switch (ent->type) {
393 case NUBUS_RESID_MAC_ADDRESS:
394 {
395 char addr[6];
396 int i;
397
398 nubus_get_rsrc_mem(addr, ent, 6);
399 printk(KERN_INFO " MAC address: ");
400 for (i = 0; i < 6; i++)
401 printk("%02x%s", addr[i] & 0xff,
402 i == 5 ? "" : ":");
403 printk("\n");
404 break;
405 }
406 default:
407 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
408 ent->type, ent->data);
409 }
410 return 0;
411}
412
413static int __init nubus_show_cpu_resource(struct nubus_dev* dev,
414 const struct nubus_dirent* ent)
415{
416 switch (ent->type) {
417 case NUBUS_RESID_MEMINFO:
418 {
419 unsigned long meminfo[2];
420 nubus_get_rsrc_mem(&meminfo, ent, 8);
421 printk(KERN_INFO " memory: [ 0x%08lx 0x%08lx ]\n",
422 meminfo[0], meminfo[1]);
423 break;
424 }
425 case NUBUS_RESID_ROMINFO:
426 {
427 unsigned long rominfo[2];
428 nubus_get_rsrc_mem(&rominfo, ent, 8);
429 printk(KERN_INFO " ROM: [ 0x%08lx 0x%08lx ]\n",
430 rominfo[0], rominfo[1]);
431 break;
432 }
433 default:
434 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
435 ent->type, ent->data);
436 }
437 return 0;
438}
439
440static int __init nubus_show_private_resource(struct nubus_dev* dev,
441 const struct nubus_dirent* ent)
442{
443 switch (dev->category) {
444 case NUBUS_CAT_DISPLAY:
445 nubus_show_display_resource(dev, ent);
446 break;
447 case NUBUS_CAT_NETWORK:
448 nubus_show_network_resource(dev, ent);
449 break;
450 case NUBUS_CAT_CPU:
451 nubus_show_cpu_resource(dev, ent);
452 break;
453 default:
454 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
455 ent->type, ent->data);
456 }
457 return 0;
458}
459
460static struct nubus_dev* __init
461 nubus_get_functional_resource(struct nubus_board* board,
462 int slot,
463 const struct nubus_dirent* parent)
464{
465 struct nubus_dir dir;
466 struct nubus_dirent ent;
467 struct nubus_dev* dev;
468
469 printk(KERN_INFO " Function 0x%02x:\n", parent->type);
470 nubus_get_subdir(parent, &dir);
471
472 /* Apple seems to have botched the ROM on the IIx */
473 if (slot == 0 && (unsigned long)dir.base % 2)
474 dir.base += 1;
475
476 if (console_loglevel >= 10)
477 printk(KERN_DEBUG "nubus_get_functional_resource: parent is 0x%p, dir is 0x%p\n",
478 parent->base, dir.base);
479
480 /* Actually we should probably panic if this fails */
481 if ((dev = kzalloc(sizeof(*dev), GFP_ATOMIC)) == NULL)
482 return NULL;
483 dev->resid = parent->type;
484 dev->directory = dir.base;
485 dev->board = board;
486
487 while (nubus_readdir(&dir, &ent) != -1)
488 {
489 switch(ent.type)
490 {
491 case NUBUS_RESID_TYPE:
492 {
493 unsigned short nbtdata[4];
494 nubus_get_rsrc_mem(nbtdata, &ent, 8);
495 dev->category = nbtdata[0];
496 dev->type = nbtdata[1];
497 dev->dr_sw = nbtdata[2];
498 dev->dr_hw = nbtdata[3];
499 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
500 nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
501 break;
502 }
503 case NUBUS_RESID_NAME:
504 {
505 nubus_get_rsrc_str(dev->name, &ent, 64);
506 printk(KERN_INFO " name: %s\n", dev->name);
507 break;
508 }
509 case NUBUS_RESID_DRVRDIR:
510 {
511 /* MacOS driver. If we were NetBSD we might
512 use this :-) */
513 struct nubus_dir drvr_dir;
514 struct nubus_dirent drvr_ent;
515 nubus_get_subdir(&ent, &drvr_dir);
516 nubus_readdir(&drvr_dir, &drvr_ent);
517 dev->driver = nubus_dirptr(&drvr_ent);
518 printk(KERN_INFO " driver at: 0x%p\n",
519 dev->driver);
520 break;
521 }
522 case NUBUS_RESID_MINOR_BASEOS:
523 /* We will need this in order to support
524 multiple framebuffers. It might be handy
525 for Ethernet as well */
526 nubus_get_rsrc_mem(&dev->iobase, &ent, 4);
527 printk(KERN_INFO " memory offset: 0x%08lx\n",
528 dev->iobase);
529 break;
530 case NUBUS_RESID_MINOR_LENGTH:
531 /* Ditto */
532 nubus_get_rsrc_mem(&dev->iosize, &ent, 4);
533 printk(KERN_INFO " memory length: 0x%08lx\n",
534 dev->iosize);
535 break;
536 case NUBUS_RESID_FLAGS:
537 dev->flags = ent.data;
538 printk(KERN_INFO " flags: 0x%06x\n", dev->flags);
539 break;
540 case NUBUS_RESID_HWDEVID:
541 dev->hwdevid = ent.data;
542 printk(KERN_INFO " hwdevid: 0x%06x\n", dev->hwdevid);
543 break;
544 default:
545 /* Local/Private resources have their own
546 function */
547 nubus_show_private_resource(dev, &ent);
548 }
549 }
550
551 return dev;
552}
553
554/* This is cool. */
555static int __init nubus_get_vidnames(struct nubus_board* board,
556 const struct nubus_dirent* parent)
557{
558 struct nubus_dir dir;
559 struct nubus_dirent ent;
560 /* FIXME: obviously we want to put this in a header file soon */
561 struct vidmode {
562 u32 size;
563 /* Don't know what this is yet */
564 u16 id;
565 /* Longest one I've seen so far is 26 characters */
566 char name[32];
567 };
568
569 printk(KERN_INFO " video modes supported:\n");
570 nubus_get_subdir(parent, &dir);
571 if (console_loglevel >= 10)
572 printk(KERN_DEBUG "nubus_get_vidnames: parent is 0x%p, dir is 0x%p\n",
573 parent->base, dir.base);
574
575 while(nubus_readdir(&dir, &ent) != -1)
576 {
577 struct vidmode mode;
578 u32 size;
579
580 /* First get the length */
581 nubus_get_rsrc_mem(&size, &ent, 4);
582
583 /* Now clobber the whole thing */
584 if (size > sizeof(mode) - 1)
585 size = sizeof(mode) - 1;
586 memset(&mode, 0, sizeof(mode));
587 nubus_get_rsrc_mem(&mode, &ent, size);
588 printk (KERN_INFO " %02X: (%02X) %s\n", ent.type,
589 mode.id, mode.name);
590 }
591 return 0;
592}
593
594/* This is *really* cool. */
595static int __init nubus_get_icon(struct nubus_board* board,
596 const struct nubus_dirent* ent)
597{
598 /* Should be 32x32 if my memory serves me correctly */
599 unsigned char icon[128];
600 int x, y;
601
602 nubus_get_rsrc_mem(&icon, ent, 128);
603 printk(KERN_INFO " icon:\n");
604
605 /* We should actually plot these somewhere in the framebuffer
606 init. This is just to demonstrate that they do, in fact,
607 exist */
608 for (y = 0; y < 32; y++) {
609 printk(KERN_INFO " ");
610 for (x = 0; x < 32; x++) {
611 if (icon[y*4 + x/8]
612 & (0x80 >> (x%8)))
613 printk("*");
614 else
615 printk(" ");
616 }
617 printk("\n");
618 }
619 return 0;
620}
621
622static int __init nubus_get_vendorinfo(struct nubus_board* board,
623 const struct nubus_dirent* parent)
624{
625 struct nubus_dir dir;
626 struct nubus_dirent ent;
627 static char* vendor_fields[6] = {"ID", "serial", "revision",
628 "part", "date", "unknown field"};
629
630 printk(KERN_INFO " vendor info:\n");
631 nubus_get_subdir(parent, &dir);
632 if (console_loglevel >= 10)
633 printk(KERN_DEBUG "nubus_get_vendorinfo: parent is 0x%p, dir is 0x%p\n",
634 parent->base, dir.base);
635
636 while(nubus_readdir(&dir, &ent) != -1)
637 {
638 char name[64];
639
640 /* These are all strings, we think */
641 nubus_get_rsrc_str(name, &ent, 64);
642 if (ent.type > 5)
643 ent.type = 5;
644 printk(KERN_INFO " %s: %s\n",
645 vendor_fields[ent.type-1], name);
646 }
647 return 0;
648}
649
650static int __init nubus_get_board_resource(struct nubus_board* board, int slot,
651 const struct nubus_dirent* parent)
652{
653 struct nubus_dir dir;
654 struct nubus_dirent ent;
655
656 nubus_get_subdir(parent, &dir);
657 if (console_loglevel >= 10)
658 printk(KERN_DEBUG "nubus_get_board_resource: parent is 0x%p, dir is 0x%p\n",
659 parent->base, dir.base);
660
661 while(nubus_readdir(&dir, &ent) != -1)
662 {
663 switch (ent.type) {
664 case NUBUS_RESID_TYPE:
665 {
666 unsigned short nbtdata[4];
667 /* This type is always the same, and is not
668 useful except insofar as it tells us that
669 we really are looking at a board resource. */
670 nubus_get_rsrc_mem(nbtdata, &ent, 8);
671 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
672 nbtdata[0], nbtdata[1], nbtdata[2],
673 nbtdata[3]);
674 if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
675 nbtdata[2] != 0 || nbtdata[3] != 0)
676 printk(KERN_ERR "this sResource is not a board resource!\n");
677 break;
678 }
679 case NUBUS_RESID_NAME:
680 nubus_get_rsrc_str(board->name, &ent, 64);
681 printk(KERN_INFO " name: %s\n", board->name);
682 break;
683 case NUBUS_RESID_ICON:
684 nubus_get_icon(board, &ent);
685 break;
686 case NUBUS_RESID_BOARDID:
687 printk(KERN_INFO " board id: 0x%x\n", ent.data);
688 break;
689 case NUBUS_RESID_PRIMARYINIT:
690 printk(KERN_INFO " primary init offset: 0x%06x\n", ent.data);
691 break;
692 case NUBUS_RESID_VENDORINFO:
693 nubus_get_vendorinfo(board, &ent);
694 break;
695 case NUBUS_RESID_FLAGS:
696 printk(KERN_INFO " flags: 0x%06x\n", ent.data);
697 break;
698 case NUBUS_RESID_HWDEVID:
699 printk(KERN_INFO " hwdevid: 0x%06x\n", ent.data);
700 break;
701 case NUBUS_RESID_SECONDINIT:
702 printk(KERN_INFO " secondary init offset: 0x%06x\n", ent.data);
703 break;
704 /* WTF isn't this in the functional resources? */
705 case NUBUS_RESID_VIDNAMES:
706 nubus_get_vidnames(board, &ent);
707 break;
708 /* Same goes for this */
709 case NUBUS_RESID_VIDMODES:
710 printk(KERN_INFO " video mode parameter directory offset: 0x%06x\n",
711 ent.data);
712 break;
713 default:
714 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
715 ent.type, ent.data);
716 }
717 }
718 return 0;
719}
720
721/* Attempt to bypass the somewhat non-obvious arrangement of
722 sResources in the motherboard ROM */
723static void __init nubus_find_rom_dir(struct nubus_board* board)
724{
725 unsigned char* rp;
726 unsigned char* romdir;
727 struct nubus_dir dir;
728 struct nubus_dirent ent;
729
730 /* Check for the extra directory just under the format block */
731 rp = board->fblock;
732 nubus_rewind(&rp, 4, board->lanes);
733 if (nubus_get_rom(&rp, 4, board->lanes) != NUBUS_TEST_PATTERN) {
734 /* OK, the ROM was telling the truth */
735 board->directory = board->fblock;
736 nubus_move(&board->directory,
737 nubus_expand32(board->doffset),
738 board->lanes);
739 return;
740 }
741
742 /* On "slot zero", you have to walk down a few more
743 directories to get to the equivalent of a real card's root
744 directory. We don't know what they were smoking when they
745 came up with this. */
746 romdir = nubus_rom_addr(board->slot);
747 nubus_rewind(&romdir, ROM_DIR_OFFSET, board->lanes);
748 dir.base = dir.ptr = romdir;
749 dir.done = 0;
750 dir.mask = board->lanes;
751
752 /* This one points to an "Unknown Macintosh" directory */
753 if (nubus_readdir(&dir, &ent) == -1)
754 goto badrom;
755
756 if (console_loglevel >= 10)
757 printk(KERN_INFO "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
758 /* This one takes us to where we want to go. */
759 if (nubus_readdir(&dir, &ent) == -1)
760 goto badrom;
761 if (console_loglevel >= 10)
762 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
763 nubus_get_subdir(&ent, &dir);
764
765 /* Resource ID 01, also an "Unknown Macintosh" */
766 if (nubus_readdir(&dir, &ent) == -1)
767 goto badrom;
768 if (console_loglevel >= 10)
769 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
770
771 /* FIXME: the first one is *not* always the right one. We
772 suspect this has something to do with the ROM revision.
773 "The HORROR ROM" (LC-series) uses 0x7e, while "The HORROR
774 Continues" (Q630) uses 0x7b. The DAFB Macs evidently use
775 something else. Please run "Slots" on your Mac (see
776 include/linux/nubus.h for where to get this program) and
777 tell us where the 'SiDirPtr' for Slot 0 is. If you feel
778 brave, you should also use MacsBug to walk down the ROM
779 directories like this function does and try to find the
780 path to that address... */
781 if (nubus_readdir(&dir, &ent) == -1)
782 goto badrom;
783 if (console_loglevel >= 10)
784 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
785
786 /* Bwahahahaha... */
787 nubus_get_subdir(&ent, &dir);
788 board->directory = dir.base;
789 return;
790
791 /* Even more evil laughter... */
792 badrom:
793 board->directory = board->fblock;
794 nubus_move(&board->directory, nubus_expand32(board->doffset), board->lanes);
795 printk(KERN_ERR "nubus_get_rom_dir: ROM weirdness! Notify the developers...\n");
796}
797
798/* Add a board (might be many devices) to the list */
799static struct nubus_board* __init nubus_add_board(int slot, int bytelanes)
800{
801 struct nubus_board* board;
802 struct nubus_board** boardp;
803
804 unsigned char *rp;
805 unsigned long dpat;
806 struct nubus_dir dir;
807 struct nubus_dirent ent;
808
809 /* Move to the start of the format block */
810 rp = nubus_rom_addr(slot);
811 nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes);
812
813 /* Actually we should probably panic if this fails */
814 if ((board = kzalloc(sizeof(*board), GFP_ATOMIC)) == NULL)
815 return NULL;
816 board->fblock = rp;
817
818 /* Dump the format block for debugging purposes */
819 if (console_loglevel >= 10) {
820 int i;
821 printk(KERN_DEBUG "Slot %X, format block at 0x%p\n",
822 slot, rp);
823 printk(KERN_DEBUG "Format block: ");
824 for (i = 0; i < FORMAT_BLOCK_SIZE; i += 4) {
825 unsigned short foo, bar;
826 foo = nubus_get_rom(&rp, 2, bytelanes);
827 bar = nubus_get_rom(&rp, 2, bytelanes);
828 printk("%04x %04x ", foo, bar);
829 }
830 printk("\n");
831 rp = board->fblock;
832 }
833
834 board->slot = slot;
835 board->slot_addr = (unsigned long) nubus_slot_addr(slot);
836 board->doffset = nubus_get_rom(&rp, 4, bytelanes);
837 /* rom_length is *supposed* to be the total length of the
838 * ROM. In practice it is the "amount of ROM used to compute
839 * the CRC." So some jokers decide to set it to zero and
840 * set the crc to zero so they don't have to do any math.
841 * See the Performa 460 ROM, for example. Those Apple "engineers".
842 */
843 board->rom_length = nubus_get_rom(&rp, 4, bytelanes);
844 board->crc = nubus_get_rom(&rp, 4, bytelanes);
845 board->rev = nubus_get_rom(&rp, 1, bytelanes);
846 board->format = nubus_get_rom(&rp,1, bytelanes);
847 board->lanes = bytelanes;
848
849 /* Directory offset should be small and negative... */
850 if(!(board->doffset & 0x00FF0000))
851 printk(KERN_WARNING "Dodgy doffset!\n");
852 dpat = nubus_get_rom(&rp, 4, bytelanes);
853 if(dpat != NUBUS_TEST_PATTERN)
854 printk(KERN_WARNING "Wrong test pattern %08lx!\n", dpat);
855
856 /*
857 * I wonder how the CRC is meant to work -
858 * any takers ?
859 * CSA: According to MAC docs, not all cards pass the CRC anyway,
860 * since the initial Macintosh ROM releases skipped the check.
861 */
862
863 /* Attempt to work around slot zero weirdness */
864 nubus_find_rom_dir(board);
865 nubus_get_root_dir(board, &dir);
866
867 /* We're ready to rock */
868 printk(KERN_INFO "Slot %X:\n", slot);
869
870 /* Each slot should have one board resource and any number of
871 functional resources. So we'll fill in some fields in the
872 struct nubus_board from the board resource, then walk down
873 the list of functional resources, spinning out a nubus_dev
874 for each of them. */
875 if (nubus_readdir(&dir, &ent) == -1) {
876 /* We can't have this! */
877 printk(KERN_ERR "Board resource not found!\n");
878 return NULL;
879 } else {
880 printk(KERN_INFO " Board resource:\n");
881 nubus_get_board_resource(board, slot, &ent);
882 }
883
884 /* Aaaarrrrgghh! The LC III motherboard has *two* board
885 resources. I have no idea WTF to do about this. */
886
887 while (nubus_readdir(&dir, &ent) != -1) {
888 struct nubus_dev* dev;
889 struct nubus_dev** devp;
890 dev = nubus_get_functional_resource(board, slot, &ent);
891 if (dev == NULL)
892 continue;
893
894 /* We zeroed this out above */
895 if (board->first_dev == NULL)
896 board->first_dev = dev;
897
898 /* Put it on the global NuBus device chain. Keep entries in order. */
899 for (devp=&nubus_devices; *devp!=NULL; devp=&((*devp)->next))
900 /* spin */;
901 *devp = dev;
902 dev->next = NULL;
903 }
904
905 /* Put it on the global NuBus board chain. Keep entries in order. */
906 for (boardp=&nubus_boards; *boardp!=NULL; boardp=&((*boardp)->next))
907 /* spin */;
908 *boardp = board;
909 board->next = NULL;
910
911 return board;
912}
913
914void __init nubus_probe_slot(int slot)
915{
916 unsigned char dp;
917 unsigned char* rp;
918 int i;
919
920 rp = nubus_rom_addr(slot);
921 for(i = 4; i; i--)
922 {
923 unsigned long flags;
924 int card_present;
925
926 rp--;
927 local_irq_save(flags);
928 card_present = hwreg_present(rp);
929 local_irq_restore(flags);
930
931 if (!card_present)
932 continue;
933
934 printk(KERN_DEBUG "Now probing slot %X at %p\n", slot, rp);
935 dp = *rp;
936 if(dp == 0)
937 continue;
938
939 /* The last byte of the format block consists of two
940 nybbles which are "mirror images" of each other.
941 These show us the valid bytelanes */
942 if ((((dp>>4) ^ dp) & 0x0F) != 0x0F)
943 continue;
944 /* Check that this value is actually *on* one of the
945 bytelanes it claims are valid! */
946 if ((dp & 0x0F) >= (1<<i))
947 continue;
948
949 /* Looks promising. Let's put it on the list. */
950 nubus_add_board(slot, dp);
951
952 return;
953 }
954}
955
956void __init nubus_scan_bus(void)
957{
958 int slot;
959 /* This might not work on your machine */
960#ifdef I_WANT_TO_PROBE_SLOT_ZERO
961 nubus_probe_slot(0);
962#endif
963 for(slot = 9; slot < 15; slot++)
964 {
965 nubus_probe_slot(slot);
966 }
967}
968
969static int __init nubus_init(void)
970{
971 if (!MACH_IS_MAC)
972 return 0;
973
974 /* Initialize the NuBus interrupts */
975 if (oss_present) {
976 oss_nubus_init();
977 } else {
978 via_nubus_init();
979 }
980
981#ifdef TRY_TO_DODGE_WSOD
982 /* Rogue Ethernet interrupts can kill the machine if we don't
983 do this. Obviously this is bogus. Hopefully the local VIA
984 gurus can fix the real cause of the problem. */
985 mdelay(1000);
986#endif
987
988 /* And probe */
989 printk("NuBus: Scanning NuBus slots.\n");
990 nubus_devices = NULL;
991 nubus_boards = NULL;
992 nubus_scan_bus();
993 nubus_proc_init();
994 return 0;
995}
996
997subsys_initcall(nubus_init);