drivers/nubus/nubus.c

   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
  27 extern void via_nubus_init(void);
  28 extern 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
  49 struct nubus_dev*   nubus_devices;
  50 struct 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
  75 static 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
  84 static 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
 102 static 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
 121 static 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
 136 static 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
 151 static inline long nubus_expand32(long foo)
 152 {
 153         if(foo & 0x00800000)    /* 24bit negative */
 154                 foo |= 0xFF000000;
 155         return foo;
 156 }
 157
 158 static 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
 167 static 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
 180 void 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 }
 191 EXPORT_SYMBOL(nubus_get_rsrc_mem);
 192
 193 void 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 }
 206 EXPORT_SYMBOL(nubus_get_rsrc_str);
 207
 208 int 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 }
 216 EXPORT_SYMBOL(nubus_get_root_dir);
 217
 218 /* This is a slyly renamed version of the above */
 219 int 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 }
 227 EXPORT_SYMBOL(nubus_get_func_dir);
 228
 229 int 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 }
 246 EXPORT_SYMBOL(nubus_get_board_dir);
 247
 248 int 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 }
 256 EXPORT_SYMBOL(nubus_get_subdir);
 257
 258 int 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 }
 285 EXPORT_SYMBOL(nubus_readdir);
 286
 287 int nubus_rewinddir(struct nubus_dir* dir)
 288 {
 289         dir->ptr = dir->base;
 290         return 0;
 291 }
 292 EXPORT_SYMBOL(nubus_rewinddir);
 293
 294 /* Driver interface functions, more or less like in pci.c */
 295
 296 struct nubus_dev*
 297 nubus_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 }
 316 EXPORT_SYMBOL(nubus_find_device);
 317
 318 struct nubus_dev*
 319 nubus_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 }
 334 EXPORT_SYMBOL(nubus_find_type);
 335
 336 struct nubus_dev*
 337 nubus_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 }
 350 EXPORT_SYMBOL(nubus_find_slot);
 351
 352 int
 353 nubus_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 }
 362 EXPORT_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
 373 static 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
 391 static 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
 415 static 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
 442 static 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
 462 static 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. */
 557 static 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. */
 597 static 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
 624 static 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
 652 static 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 */
 725 static 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 */
 801 static 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
 916 void __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
 962 static 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
 973 static 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
1008 void __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
1021 static 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
1053 subsys_initcall(nubus_init);