2 * Macintosh Nubus Interface Code
4 * Originally by Alan Cox
6 * Mostly rewritten by David Huggins-Daines, C. Scott Ananian,
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 <asm/setup.h>
18 #include <asm/system.h>
20 #include <asm/hwtest.h>
21 #include <linux/proc_fs.h>
22 #include <asm/mac_via.h>
23 #include <asm/mac_oss.h>
25 extern void via_nubus_init(void);
26 extern void oss_nubus_init(void);
30 /* This is, of course, the size in bytelanes, rather than the size in
32 #define FORMAT_BLOCK_SIZE 20
33 #define ROM_DIR_OFFSET 0x24
35 #define NUBUS_TEST_PATTERN 0x5A932BC7
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
40 #undef I_WANT_TO_PROBE_SLOT_ZERO
42 /* This sometimes helps combat failure to boot */
43 #undef TRY_TO_DODGE_WSOD
47 struct nubus_dev* nubus_devices;
48 struct nubus_board* nubus_boards;
50 /* Meaning of "bytelanes":
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:
58 A map of 0x0f, as found in the MacOS ROM, means that all bytelanes
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)
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)
68 A map of 0x78 means that only the LSB of each long word is valid.
70 Etcetera, etcetera. Hopefully this clears up some confusion over
71 what the following code actually does. */
73 static inline int not_useful(void *p, int map)
75 unsigned long pv=(unsigned long)p;
82 static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map)
84 /* This will hold the result */
86 unsigned char *p = *ptr;
91 while(not_useful(p,map))
100 static void nubus_rewind(unsigned char **ptr, int len, int map)
102 unsigned char *p=*ptr;
106 printk(KERN_ERR "rewind of 0x%08x!\n", len);
113 while(not_useful(p, map));
119 static void nubus_advance(unsigned char **ptr, int len, int map)
121 unsigned char *p = *ptr;
123 printk(KERN_ERR "advance of 0x%08x!\n", len);
126 while(not_useful(p,map))
134 static void nubus_move(unsigned char **ptr, int len, int map)
137 nubus_advance(ptr, len, map);
139 nubus_rewind(ptr, -len, map);
142 /* Now, functions to read the sResource tree */
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
149 static inline long nubus_expand32(long foo)
151 if(foo & 0x00800000) /* 24bit negative */
156 static inline void *nubus_rom_addr(int slot)
159 * Returns the first byte after the card. We then walk
160 * backwards to get the lane register and the config
162 return (void *)(0xF1000000+(slot<<24));
165 static unsigned char *nubus_dirptr(const struct nubus_dirent *nd)
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 */
175 /* These two are for pulling resource data blocks (i.e. stuff that's
176 pointed to with offsets) out of the card ROM. */
178 void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent* dirent,
181 unsigned char *t = (unsigned char *)dest;
182 unsigned char *p = nubus_dirptr(dirent);
185 *t++ = nubus_get_rom(&p, 1, dirent->mask);
190 void nubus_get_rsrc_str(void *dest, const struct nubus_dirent* dirent,
193 unsigned char *t=(unsigned char *)dest;
194 unsigned char *p = nubus_dirptr(dirent);
197 *t = nubus_get_rom(&p, 1, dirent->mask);
204 int nubus_get_root_dir(const struct nubus_board* board,
205 struct nubus_dir* dir)
207 dir->ptr = dir->base = board->directory;
209 dir->mask = board->lanes;
213 /* This is a slyly renamed version of the above */
214 int nubus_get_func_dir(const struct nubus_dev* dev,
215 struct nubus_dir* dir)
217 dir->ptr = dir->base = dev->directory;
219 dir->mask = dev->board->lanes;
223 int nubus_get_board_dir(const struct nubus_board* board,
224 struct nubus_dir* dir)
226 struct nubus_dirent ent;
228 dir->ptr = dir->base = board->directory;
230 dir->mask = board->lanes;
232 /* Now dereference it (the first directory is always the board
234 if (nubus_readdir(dir, &ent) == -1)
236 if (nubus_get_subdir(&ent, dir) == -1)
241 int nubus_get_subdir(const struct nubus_dirent *ent,
242 struct nubus_dir *dir)
244 dir->ptr = dir->base = nubus_dirptr(ent);
246 dir->mask = ent->mask;
250 int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent)
256 /* Do this first, otherwise nubus_rewind & co are off by 4 */
259 /* This moves nd->ptr forward */
260 resid = nubus_get_rom(&nd->ptr, 4, nd->mask);
262 /* EOL marker, as per the Apple docs */
263 if((resid&0xff000000) == 0xff000000)
265 /* Mark it as done */
270 /* First byte is the resource ID */
271 ent->type = resid >> 24;
272 /* Low 3 bytes might contain data (or might not) */
273 ent->data = resid & 0xffffff;
274 ent->mask = nd->mask;
278 int nubus_rewinddir(struct nubus_dir* dir)
280 dir->ptr = dir->base;
284 /* Driver interface functions, more or less like in pci.c */
287 nubus_find_device(unsigned short category,
289 unsigned short dr_hw,
290 unsigned short dr_sw,
291 const struct nubus_dev* from)
293 struct nubus_dev* itor =
294 from ? from->next : nubus_devices;
297 if (itor->category == category
298 && itor->type == type
299 && itor->dr_hw == dr_hw
300 && itor->dr_sw == dr_sw)
308 nubus_find_type(unsigned short category,
310 const struct nubus_dev* from)
312 struct nubus_dev* itor =
313 from ? from->next : nubus_devices;
316 if (itor->category == category
317 && itor->type == type)
325 nubus_find_slot(unsigned int slot,
326 const struct nubus_dev* from)
328 struct nubus_dev* itor =
329 from ? from->next : nubus_devices;
332 if (itor->board->slot == slot)
340 nubus_find_rsrc(struct nubus_dir* dir, unsigned char rsrc_type,
341 struct nubus_dirent* ent)
343 while (nubus_readdir(dir, ent) != -1) {
344 if (ent->type == rsrc_type)
350 /* Initialization functions - decide which slots contain stuff worth
351 looking at, and print out lots and lots of information from the
354 /* FIXME: A lot of this stuff will eventually be useful after
355 initializaton, for intelligently probing Ethernet and video chips,
356 among other things. The rest of it should go in the /proc code.
357 For now, we just use it to give verbose boot logs. */
359 static int __init nubus_show_display_resource(struct nubus_dev* dev,
360 const struct nubus_dirent* ent)
363 case NUBUS_RESID_GAMMADIR:
364 printk(KERN_INFO " gamma directory offset: 0x%06x\n", ent->data);
366 case 0x0080 ... 0x0085:
367 printk(KERN_INFO " mode %02X info offset: 0x%06x\n",
368 ent->type, ent->data);
371 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
372 ent->type, ent->data);
377 static int __init nubus_show_network_resource(struct nubus_dev* dev,
378 const struct nubus_dirent* ent)
381 case NUBUS_RESID_MAC_ADDRESS:
386 nubus_get_rsrc_mem(addr, ent, 6);
387 printk(KERN_INFO " MAC address: ");
388 for (i = 0; i < 6; i++)
389 printk("%02x%s", addr[i] & 0xff,
395 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
396 ent->type, ent->data);
401 static int __init nubus_show_cpu_resource(struct nubus_dev* dev,
402 const struct nubus_dirent* ent)
405 case NUBUS_RESID_MEMINFO:
407 unsigned long meminfo[2];
408 nubus_get_rsrc_mem(&meminfo, ent, 8);
409 printk(KERN_INFO " memory: [ 0x%08lx 0x%08lx ]\n",
410 meminfo[0], meminfo[1]);
413 case NUBUS_RESID_ROMINFO:
415 unsigned long rominfo[2];
416 nubus_get_rsrc_mem(&rominfo, ent, 8);
417 printk(KERN_INFO " ROM: [ 0x%08lx 0x%08lx ]\n",
418 rominfo[0], rominfo[1]);
422 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
423 ent->type, ent->data);
428 static int __init nubus_show_private_resource(struct nubus_dev* dev,
429 const struct nubus_dirent* ent)
431 switch (dev->category) {
432 case NUBUS_CAT_DISPLAY:
433 nubus_show_display_resource(dev, ent);
435 case NUBUS_CAT_NETWORK:
436 nubus_show_network_resource(dev, ent);
439 nubus_show_cpu_resource(dev, ent);
442 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
443 ent->type, ent->data);
448 static struct nubus_dev* __init
449 nubus_get_functional_resource(struct nubus_board* board,
451 const struct nubus_dirent* parent)
453 struct nubus_dir dir;
454 struct nubus_dirent ent;
455 struct nubus_dev* dev;
457 printk(KERN_INFO " Function 0x%02x:\n", parent->type);
458 nubus_get_subdir(parent, &dir);
460 /* Apple seems to have botched the ROM on the IIx */
461 if (slot == 0 && (unsigned long)dir.base % 2)
464 if (console_loglevel >= 10)
465 printk(KERN_DEBUG "nubus_get_functional_resource: parent is 0x%p, dir is 0x%p\n",
466 parent->base, dir.base);
468 /* Actually we should probably panic if this fails */
469 if ((dev = kmalloc(sizeof(*dev), GFP_ATOMIC)) == NULL)
471 memset(dev, 0, sizeof(*dev));
472 dev->resid = parent->type;
473 dev->directory = dir.base;
476 while (nubus_readdir(&dir, &ent) != -1)
480 case NUBUS_RESID_TYPE:
482 unsigned short nbtdata[4];
483 nubus_get_rsrc_mem(nbtdata, &ent, 8);
484 dev->category = nbtdata[0];
485 dev->type = nbtdata[1];
486 dev->dr_sw = nbtdata[2];
487 dev->dr_hw = nbtdata[3];
488 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
489 nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
492 case NUBUS_RESID_NAME:
494 nubus_get_rsrc_str(dev->name, &ent, 64);
495 printk(KERN_INFO " name: %s\n", dev->name);
498 case NUBUS_RESID_DRVRDIR:
500 /* MacOS driver. If we were NetBSD we might
502 struct nubus_dir drvr_dir;
503 struct nubus_dirent drvr_ent;
504 nubus_get_subdir(&ent, &drvr_dir);
505 nubus_readdir(&drvr_dir, &drvr_ent);
506 dev->driver = nubus_dirptr(&drvr_ent);
507 printk(KERN_INFO " driver at: 0x%p\n",
511 case NUBUS_RESID_MINOR_BASEOS:
512 /* We will need this in order to support
513 multiple framebuffers. It might be handy
514 for Ethernet as well */
515 nubus_get_rsrc_mem(&dev->iobase, &ent, 4);
516 printk(KERN_INFO " memory offset: 0x%08lx\n",
519 case NUBUS_RESID_MINOR_LENGTH:
521 nubus_get_rsrc_mem(&dev->iosize, &ent, 4);
522 printk(KERN_INFO " memory length: 0x%08lx\n",
525 case NUBUS_RESID_FLAGS:
526 dev->flags = ent.data;
527 printk(KERN_INFO " flags: 0x%06x\n", dev->flags);
529 case NUBUS_RESID_HWDEVID:
530 dev->hwdevid = ent.data;
531 printk(KERN_INFO " hwdevid: 0x%06x\n", dev->hwdevid);
534 /* Local/Private resources have their own
536 nubus_show_private_resource(dev, &ent);
544 static int __init nubus_get_vidnames(struct nubus_board* board,
545 const struct nubus_dirent* parent)
547 struct nubus_dir dir;
548 struct nubus_dirent ent;
549 /* FIXME: obviously we want to put this in a header file soon */
552 /* Don't know what this is yet */
554 /* Longest one I've seen so far is 26 characters */
558 printk(KERN_INFO " video modes supported:\n");
559 nubus_get_subdir(parent, &dir);
560 if (console_loglevel >= 10)
561 printk(KERN_DEBUG "nubus_get_vidnames: parent is 0x%p, dir is 0x%p\n",
562 parent->base, dir.base);
564 while(nubus_readdir(&dir, &ent) != -1)
569 /* First get the length */
570 nubus_get_rsrc_mem(&size, &ent, 4);
572 /* Now clobber the whole thing */
573 if (size > sizeof(mode) - 1)
574 size = sizeof(mode) - 1;
575 memset(&mode, 0, sizeof(mode));
576 nubus_get_rsrc_mem(&mode, &ent, size);
577 printk (KERN_INFO " %02X: (%02X) %s\n", ent.type,
583 /* This is *really* cool. */
584 static int __init nubus_get_icon(struct nubus_board* board,
585 const struct nubus_dirent* ent)
587 /* Should be 32x32 if my memory serves me correctly */
588 unsigned char icon[128];
591 nubus_get_rsrc_mem(&icon, ent, 128);
592 printk(KERN_INFO " icon:\n");
594 /* We should actually plot these somewhere in the framebuffer
595 init. This is just to demonstrate that they do, in fact,
597 for (y = 0; y < 32; y++) {
598 printk(KERN_INFO " ");
599 for (x = 0; x < 32; x++) {
611 static int __init nubus_get_vendorinfo(struct nubus_board* board,
612 const struct nubus_dirent* parent)
614 struct nubus_dir dir;
615 struct nubus_dirent ent;
616 static char* vendor_fields[6] = {"ID", "serial", "revision",
617 "part", "date", "unknown field"};
619 printk(KERN_INFO " vendor info:\n");
620 nubus_get_subdir(parent, &dir);
621 if (console_loglevel >= 10)
622 printk(KERN_DEBUG "nubus_get_vendorinfo: parent is 0x%p, dir is 0x%p\n",
623 parent->base, dir.base);
625 while(nubus_readdir(&dir, &ent) != -1)
629 /* These are all strings, we think */
630 nubus_get_rsrc_str(name, &ent, 64);
633 printk(KERN_INFO " %s: %s\n",
634 vendor_fields[ent.type-1], name);
639 static int __init nubus_get_board_resource(struct nubus_board* board, int slot,
640 const struct nubus_dirent* parent)
642 struct nubus_dir dir;
643 struct nubus_dirent ent;
645 nubus_get_subdir(parent, &dir);
646 if (console_loglevel >= 10)
647 printk(KERN_DEBUG "nubus_get_board_resource: parent is 0x%p, dir is 0x%p\n",
648 parent->base, dir.base);
650 while(nubus_readdir(&dir, &ent) != -1)
653 case NUBUS_RESID_TYPE:
655 unsigned short nbtdata[4];
656 /* This type is always the same, and is not
657 useful except insofar as it tells us that
658 we really are looking at a board resource. */
659 nubus_get_rsrc_mem(nbtdata, &ent, 8);
660 printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n",
661 nbtdata[0], nbtdata[1], nbtdata[2],
663 if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
664 nbtdata[2] != 0 || nbtdata[3] != 0)
665 printk(KERN_ERR "this sResource is not a board resource!\n");
668 case NUBUS_RESID_NAME:
669 nubus_get_rsrc_str(board->name, &ent, 64);
670 printk(KERN_INFO " name: %s\n", board->name);
672 case NUBUS_RESID_ICON:
673 nubus_get_icon(board, &ent);
675 case NUBUS_RESID_BOARDID:
676 printk(KERN_INFO " board id: 0x%x\n", ent.data);
678 case NUBUS_RESID_PRIMARYINIT:
679 printk(KERN_INFO " primary init offset: 0x%06x\n", ent.data);
681 case NUBUS_RESID_VENDORINFO:
682 nubus_get_vendorinfo(board, &ent);
684 case NUBUS_RESID_FLAGS:
685 printk(KERN_INFO " flags: 0x%06x\n", ent.data);
687 case NUBUS_RESID_HWDEVID:
688 printk(KERN_INFO " hwdevid: 0x%06x\n", ent.data);
690 case NUBUS_RESID_SECONDINIT:
691 printk(KERN_INFO " secondary init offset: 0x%06x\n", ent.data);
693 /* WTF isn't this in the functional resources? */
694 case NUBUS_RESID_VIDNAMES:
695 nubus_get_vidnames(board, &ent);
697 /* Same goes for this */
698 case NUBUS_RESID_VIDMODES:
699 printk(KERN_INFO " video mode parameter directory offset: 0x%06x\n",
703 printk(KERN_INFO " unknown resource %02X, data 0x%06x\n",
710 /* Attempt to bypass the somewhat non-obvious arrangement of
711 sResources in the motherboard ROM */
712 static void __init nubus_find_rom_dir(struct nubus_board* board)
715 unsigned char* romdir;
716 struct nubus_dir dir;
717 struct nubus_dirent ent;
719 /* Check for the extra directory just under the format block */
721 nubus_rewind(&rp, 4, board->lanes);
722 if (nubus_get_rom(&rp, 4, board->lanes) != NUBUS_TEST_PATTERN) {
723 /* OK, the ROM was telling the truth */
724 board->directory = board->fblock;
725 nubus_move(&board->directory,
726 nubus_expand32(board->doffset),
731 /* On "slot zero", you have to walk down a few more
732 directories to get to the equivalent of a real card's root
733 directory. We don't know what they were smoking when they
734 came up with this. */
735 romdir = nubus_rom_addr(board->slot);
736 nubus_rewind(&romdir, ROM_DIR_OFFSET, board->lanes);
737 dir.base = dir.ptr = romdir;
739 dir.mask = board->lanes;
741 /* This one points to an "Unknown Macintosh" directory */
742 if (nubus_readdir(&dir, &ent) == -1)
745 if (console_loglevel >= 10)
746 printk(KERN_INFO "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
747 /* This one takes us to where we want to go. */
748 if (nubus_readdir(&dir, &ent) == -1)
750 if (console_loglevel >= 10)
751 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
752 nubus_get_subdir(&ent, &dir);
754 /* Resource ID 01, also an "Unknown Macintosh" */
755 if (nubus_readdir(&dir, &ent) == -1)
757 if (console_loglevel >= 10)
758 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
760 /* FIXME: the first one is *not* always the right one. We
761 suspect this has something to do with the ROM revision.
762 "The HORROR ROM" (LC-series) uses 0x7e, while "The HORROR
763 Continues" (Q630) uses 0x7b. The DAFB Macs evidently use
764 something else. Please run "Slots" on your Mac (see
765 include/linux/nubus.h for where to get this program) and
766 tell us where the 'SiDirPtr' for Slot 0 is. If you feel
767 brave, you should also use MacsBug to walk down the ROM
768 directories like this function does and try to find the
769 path to that address... */
770 if (nubus_readdir(&dir, &ent) == -1)
772 if (console_loglevel >= 10)
773 printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data);
776 nubus_get_subdir(&ent, &dir);
777 board->directory = dir.base;
780 /* Even more evil laughter... */
782 board->directory = board->fblock;
783 nubus_move(&board->directory, nubus_expand32(board->doffset), board->lanes);
784 printk(KERN_ERR "nubus_get_rom_dir: ROM weirdness! Notify the developers...\n");
787 /* Add a board (might be many devices) to the list */
788 static struct nubus_board* __init nubus_add_board(int slot, int bytelanes)
790 struct nubus_board* board;
791 struct nubus_board** boardp;
795 struct nubus_dir dir;
796 struct nubus_dirent ent;
798 /* Move to the start of the format block */
799 rp = nubus_rom_addr(slot);
800 nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes);
802 /* Actually we should probably panic if this fails */
803 if ((board = kmalloc(sizeof(*board), GFP_ATOMIC)) == NULL)
805 memset(board, 0, sizeof(*board));
808 /* Dump the format block for debugging purposes */
809 if (console_loglevel >= 10) {
811 printk(KERN_DEBUG "Slot %X, format block at 0x%p\n",
813 printk(KERN_DEBUG "Format block: ");
814 for (i = 0; i < FORMAT_BLOCK_SIZE; i += 4) {
815 unsigned short foo, bar;
816 foo = nubus_get_rom(&rp, 2, bytelanes);
817 bar = nubus_get_rom(&rp, 2, bytelanes);
818 printk("%04x %04x ", foo, bar);
825 board->slot_addr = (unsigned long) nubus_slot_addr(slot);
826 board->doffset = nubus_get_rom(&rp, 4, bytelanes);
827 /* rom_length is *supposed* to be the total length of the
828 * ROM. In practice it is the "amount of ROM used to compute
829 * the CRC." So some jokers decide to set it to zero and
830 * set the crc to zero so they don't have to do any math.
831 * See the Performa 460 ROM, for example. Those Apple "engineers".
833 board->rom_length = nubus_get_rom(&rp, 4, bytelanes);
834 board->crc = nubus_get_rom(&rp, 4, bytelanes);
835 board->rev = nubus_get_rom(&rp, 1, bytelanes);
836 board->format = nubus_get_rom(&rp,1, bytelanes);
837 board->lanes = bytelanes;
839 /* Directory offset should be small and negative... */
840 if(!(board->doffset & 0x00FF0000))
841 printk(KERN_WARNING "Dodgy doffset!\n");
842 dpat = nubus_get_rom(&rp, 4, bytelanes);
843 if(dpat != NUBUS_TEST_PATTERN)
844 printk(KERN_WARNING "Wrong test pattern %08lx!\n", dpat);
847 * I wonder how the CRC is meant to work -
849 * CSA: According to MAC docs, not all cards pass the CRC anyway,
850 * since the initial Macintosh ROM releases skipped the check.
853 /* Attempt to work around slot zero weirdness */
854 nubus_find_rom_dir(board);
855 nubus_get_root_dir(board, &dir);
857 /* We're ready to rock */
858 printk(KERN_INFO "Slot %X:\n", slot);
860 /* Each slot should have one board resource and any number of
861 functional resources. So we'll fill in some fields in the
862 struct nubus_board from the board resource, then walk down
863 the list of functional resources, spinning out a nubus_dev
865 if (nubus_readdir(&dir, &ent) == -1) {
866 /* We can't have this! */
867 printk(KERN_ERR "Board resource not found!\n");
870 printk(KERN_INFO " Board resource:\n");
871 nubus_get_board_resource(board, slot, &ent);
874 /* Aaaarrrrgghh! The LC III motherboard has *two* board
875 resources. I have no idea WTF to do about this. */
877 while (nubus_readdir(&dir, &ent) != -1) {
878 struct nubus_dev* dev;
879 struct nubus_dev** devp;
880 dev = nubus_get_functional_resource(board, slot, &ent);
884 /* We zeroed this out above */
885 if (board->first_dev == NULL)
886 board->first_dev = dev;
888 /* Put it on the global NuBus device chain. Keep entries in order. */
889 for (devp=&nubus_devices; *devp!=NULL; devp=&((*devp)->next))
895 /* Put it on the global NuBus board chain. Keep entries in order. */
896 for (boardp=&nubus_boards; *boardp!=NULL; boardp=&((*boardp)->next))
904 void __init nubus_probe_slot(int slot)
910 rp = nubus_rom_addr(slot);
917 local_irq_save(flags);
918 card_present = hwreg_present(rp);
919 local_irq_restore(flags);
924 printk(KERN_DEBUG "Now probing slot %X at %p\n", slot, rp);
929 /* The last byte of the format block consists of two
930 nybbles which are "mirror images" of each other.
931 These show us the valid bytelanes */
932 if ((((dp>>4) ^ dp) & 0x0F) != 0x0F)
934 /* Check that this value is actually *on* one of the
935 bytelanes it claims are valid! */
936 if ((dp & 0x0F) >= (1<<i))
939 /* Looks promising. Let's put it on the list. */
940 nubus_add_board(slot, dp);
946 #if defined(CONFIG_PROC_FS)
948 /* /proc/nubus stuff */
950 static int sprint_nubus_board(struct nubus_board* board, char* ptr, int len)
955 sprintf(ptr, "Slot %X: %s\n",
956 board->slot, board->name);
961 static int nubus_read_proc(char *page, char **start, off_t off,
962 int count, int *eof, void *data)
964 int nprinted, len, begin = 0;
965 int size = PAGE_SIZE;
966 struct nubus_board* board;
968 len = sprintf(page, "Nubus devices found:\n");
969 /* Walk the list of NuBus boards */
970 for (board = nubus_boards; board != NULL; board = board->next)
972 nprinted = sprint_nubus_board(board, page + len, size - len);
976 if (len+begin < off) {
980 if (len+begin >= off+count)
996 void __init nubus_scan_bus(void)
999 /* This might not work on your machine */
1000 #ifdef I_WANT_TO_PROBE_SLOT_ZERO
1001 nubus_probe_slot(0);
1003 for(slot = 9; slot < 15; slot++)
1005 nubus_probe_slot(slot);
1009 static int __init nubus_init(void)
1014 /* Initialize the NuBus interrupts */
1021 #ifdef TRY_TO_DODGE_WSOD
1022 /* Rogue Ethernet interrupts can kill the machine if we don't
1023 do this. Obviously this is bogus. Hopefully the local VIA
1024 gurus can fix the real cause of the problem. */
1029 printk("NuBus: Scanning NuBus slots.\n");
1030 nubus_devices = NULL;
1031 nubus_boards = NULL;
1034 #ifdef CONFIG_PROC_FS
1035 create_proc_read_entry("nubus", 0, NULL, nubus_read_proc, NULL);
1041 subsys_initcall(nubus_init);