drivers/net/arcnet/com90xx.c

   1 /*
   2  * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
   3  *
   4  * Written 1994-1999 by Avery Pennarun.
   5  * Written 1999 by Martin Mares <mj@ucw.cz>.
   6  * Derived from skeleton.c by Donald Becker.
   7  *
   8  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
   9  *  for sponsoring the further development of this driver.
  10  *
  11  * **********************
  12  *
  13  * The original copyright of skeleton.c was as follows:
  14  *
  15  * skeleton.c Written 1993 by Donald Becker.
  16  * Copyright 1993 United States Government as represented by the
  17  * Director, National Security Agency.  This software may only be used
  18  * and distributed according to the terms of the GNU General Public License as
  19  * modified by SRC, incorporated herein by reference.
  20  *
  21  * **********************
  22  *
  23  * For more details, see drivers/net/arcnet.c
  24  *
  25  * **********************
  26  */
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/init.h>
  30 #include <linux/ioport.h>
  31 #include <linux/delay.h>
  32 #include <linux/netdevice.h>
  33 #include <asm/io.h>
  34 #include <linux/arcdevice.h>
  35
  36
  37 #define VERSION "arcnet: COM90xx chipset support\n"
  38
  39
  40 /* Define this to speed up the autoprobe by assuming if only one io port and
  41  * shmem are left in the list at Stage 5, they must correspond to each
  42  * other.
  43  *
  44  * This is undefined by default because it might not always be true, and the
  45  * extra check makes the autoprobe even more careful.  Speed demons can turn
  46  * it on - I think it should be fine if you only have one ARCnet card
  47  * installed.
  48  *
  49  * If no ARCnet cards are installed, this delay never happens anyway and thus
  50  * the option has no effect.
  51  */
  52 #undef FAST_PROBE
  53
  54
  55 /* Internal function declarations */
  56 static int com90xx_found(int ioaddr, int airq, u_long shmem);
  57 static void com90xx_command(struct net_device *dev, int command);
  58 static int com90xx_status(struct net_device *dev);
  59 static void com90xx_setmask(struct net_device *dev, int mask);
  60 static int com90xx_reset(struct net_device *dev, int really_reset);
  61 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
  62                                  void *buf, int count);
  63 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
  64                                    void *buf, int count);
  65
  66 /* Known ARCnet cards */
  67
  68 static struct net_device *cards[16];
  69 static int numcards;
  70
  71 /* Handy defines for ARCnet specific stuff */
  72
  73 /* The number of low I/O ports used by the card */
  74 #define ARCNET_TOTAL_SIZE       16
  75
  76 /* Amount of I/O memory used by the card */
  77 #define BUFFER_SIZE (512)
  78 #define MIRROR_SIZE (BUFFER_SIZE*4)
  79
  80 /* COM 9026 controller chip --> ARCnet register addresses */
  81 #define _INTMASK (ioaddr+0)     /* writable */
  82 #define _STATUS  (ioaddr+0)     /* readable */
  83 #define _COMMAND (ioaddr+1)     /* writable, returns random vals on read (?) */
  84 #define _CONFIG  (ioaddr+2)     /* Configuration register */
  85 #define _RESET   (ioaddr+8)     /* software reset (on read) */
  86 #define _MEMDATA (ioaddr+12)    /* Data port for IO-mapped memory */
  87 #define _ADDR_HI (ioaddr+15)    /* Control registers for said */
  88 #define _ADDR_LO (ioaddr+14)
  89
  90 #undef ASTATUS
  91 #undef ACOMMAND
  92 #undef AINTMASK
  93
  94 #define ASTATUS()       inb(_STATUS)
  95 #define ACOMMAND(cmd)   outb((cmd),_COMMAND)
  96 #define AINTMASK(msk)   outb((msk),_INTMASK)
  97
  98
  99 static int com90xx_skip_probe __initdata = 0;
 100
 101 /* Module parameters */
 102
 103 static int io;                  /* use the insmod io= irq= shmem= options */
 104 static int irq;
 105 static int shmem;
 106 static char device[9];          /* use eg. device=arc1 to change name */
 107
 108 module_param(io, int, 0);
 109 module_param(irq, int, 0);
 110 module_param(shmem, int, 0);
 111 module_param_string(device, device, sizeof(device), 0);
 112
 113 static void __init com90xx_probe(void)
 114 {
 115         int count, status, ioaddr, numprint, airq, openparen = 0;
 116         unsigned long airqmask;
 117         int ports[(0x3f0 - 0x200) / 16 + 1] =
 118         {0};
 119         u_long shmems[(0xFF800 - 0xA0000) / 2048 + 1] =
 120         {0};
 121         int numports, numshmems, *port;
 122         u_long *p;
 123
 124         if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
 125                 return;
 126
 127         BUGLVL(D_NORMAL) printk(VERSION);
 128
 129         /* set up the arrays where we'll store the possible probe addresses */
 130         numports = numshmems = 0;
 131         if (io)
 132                 ports[numports++] = io;
 133         else
 134                 for (count = 0x200; count <= 0x3f0; count += 16)
 135                         ports[numports++] = count;
 136         if (shmem)
 137                 shmems[numshmems++] = shmem;
 138         else
 139                 for (count = 0xA0000; count <= 0xFF800; count += 2048)
 140                         shmems[numshmems++] = count;
 141
 142         /* Stage 1: abandon any reserved ports, or ones with status==0xFF
 143          * (empty), and reset any others by reading the reset port.
 144          */
 145         numprint = -1;
 146         for (port = &ports[0]; port - ports < numports; port++) {
 147                 numprint++;
 148                 numprint %= 8;
 149                 if (!numprint) {
 150                         BUGMSG2(D_INIT, "\n");
 151                         BUGMSG2(D_INIT, "S1: ");
 152                 }
 153                 BUGMSG2(D_INIT, "%Xh ", *port);
 154
 155                 ioaddr = *port;
 156
 157                 if (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
 158                         BUGMSG2(D_INIT_REASONS, "(request_region)\n");
 159                         BUGMSG2(D_INIT_REASONS, "S1: ");
 160                         BUGLVL(D_INIT_REASONS) numprint = 0;
 161                         *port-- = ports[--numports];
 162                         continue;
 163                 }
 164                 if (ASTATUS() == 0xFF) {
 165                         BUGMSG2(D_INIT_REASONS, "(empty)\n");
 166                         BUGMSG2(D_INIT_REASONS, "S1: ");
 167                         BUGLVL(D_INIT_REASONS) numprint = 0;
 168                         release_region(*port, ARCNET_TOTAL_SIZE);
 169                         *port-- = ports[--numports];
 170                         continue;
 171                 }
 172                 inb(_RESET);    /* begin resetting card */
 173
 174                 BUGMSG2(D_INIT_REASONS, "\n");
 175                 BUGMSG2(D_INIT_REASONS, "S1: ");
 176                 BUGLVL(D_INIT_REASONS) numprint = 0;
 177         }
 178         BUGMSG2(D_INIT, "\n");
 179
 180         if (!numports) {
 181                 BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.\n");
 182                 return;
 183         }
 184         /* Stage 2: we have now reset any possible ARCnet cards, so we can't
 185          * do anything until they finish.  If D_INIT, print the list of
 186          * cards that are left.
 187          */
 188         numprint = -1;
 189         for (port = &ports[0]; port < ports + numports; port++) {
 190                 numprint++;
 191                 numprint %= 8;
 192                 if (!numprint) {
 193                         BUGMSG2(D_INIT, "\n");
 194                         BUGMSG2(D_INIT, "S2: ");
 195                 }
 196                 BUGMSG2(D_INIT, "%Xh ", *port);
 197         }
 198         BUGMSG2(D_INIT, "\n");
 199         mdelay(RESETtime);
 200
 201         /* Stage 3: abandon any shmem addresses that don't have the signature
 202          * 0xD1 byte in the right place, or are read-only.
 203          */
 204         numprint = -1;
 205         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 206                 u_long ptr = *p;
 207
 208                 numprint++;
 209                 numprint %= 8;
 210                 if (!numprint) {
 211                         BUGMSG2(D_INIT, "\n");
 212                         BUGMSG2(D_INIT, "S3: ");
 213                 }
 214                 BUGMSG2(D_INIT, "%lXh ", *p);
 215
 216                 if (!request_mem_region(*p, BUFFER_SIZE, "arcnet (90xx)")) {
 217                         BUGMSG2(D_INIT_REASONS, "(request_mem_region)\n");
 218                         BUGMSG2(D_INIT_REASONS, "Stage 3: ");
 219                         BUGLVL(D_INIT_REASONS) numprint = 0;
 220                         *p-- = shmems[--numshmems];
 221                         continue;
 222                 }
 223                 if (isa_readb(ptr) != TESTvalue) {
 224                         BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
 225                                 isa_readb(ptr), TESTvalue);
 226                         BUGMSG2(D_INIT_REASONS, "S3: ");
 227                         BUGLVL(D_INIT_REASONS) numprint = 0;
 228                         release_mem_region(*p, BUFFER_SIZE);
 229                         *p-- = shmems[--numshmems];
 230                         continue;
 231                 }
 232                 /* By writing 0x42 to the TESTvalue location, we also make
 233                  * sure no "mirror" shmem areas show up - if they occur
 234                  * in another pass through this loop, they will be discarded
 235                  * because *cptr != TESTvalue.
 236                  */
 237                 isa_writeb(0x42, ptr);
 238                 if (isa_readb(ptr) != 0x42) {
 239                         BUGMSG2(D_INIT_REASONS, "(read only)\n");
 240                         BUGMSG2(D_INIT_REASONS, "S3: ");
 241                         release_mem_region(*p, BUFFER_SIZE);
 242                         *p-- = shmems[--numshmems];
 243                         continue;
 244                 }
 245                 BUGMSG2(D_INIT_REASONS, "\n");
 246                 BUGMSG2(D_INIT_REASONS, "S3: ");
 247                 BUGLVL(D_INIT_REASONS) numprint = 0;
 248         }
 249         BUGMSG2(D_INIT, "\n");
 250
 251         if (!numshmems) {
 252                 BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.\n");
 253                 for (port = &ports[0]; port < ports + numports; port++)
 254                         release_region(*port, ARCNET_TOTAL_SIZE);
 255                 return;
 256         }
 257         /* Stage 4: something of a dummy, to report the shmems that are
 258          * still possible after stage 3.
 259          */
 260         numprint = -1;
 261         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 262                 numprint++;
 263                 numprint %= 8;
 264                 if (!numprint) {
 265                         BUGMSG2(D_INIT, "\n");
 266                         BUGMSG2(D_INIT, "S4: ");
 267                 }
 268                 BUGMSG2(D_INIT, "%lXh ", *p);
 269         }
 270         BUGMSG2(D_INIT, "\n");
 271
 272         /* Stage 5: for any ports that have the correct status, can disable
 273          * the RESET flag, and (if no irq is given) generate an autoirq,
 274          * register an ARCnet device.
 275          *
 276          * Currently, we can only register one device per probe, so quit
 277          * after the first one is found.
 278          */
 279         numprint = -1;
 280         for (port = &ports[0]; port < ports + numports; port++) {
 281                 int found = 0;
 282                 numprint++;
 283                 numprint %= 8;
 284                 if (!numprint) {
 285                         BUGMSG2(D_INIT, "\n");
 286                         BUGMSG2(D_INIT, "S5: ");
 287                 }
 288                 BUGMSG2(D_INIT, "%Xh ", *port);
 289
 290                 ioaddr = *port;
 291                 status = ASTATUS();
 292
 293                 if ((status & 0x9D)
 294                     != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 295                         BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
 296                         BUGMSG2(D_INIT_REASONS, "S5: ");
 297                         BUGLVL(D_INIT_REASONS) numprint = 0;
 298                         release_region(*port, ARCNET_TOTAL_SIZE);
 299                         *port-- = ports[--numports];
 300                         continue;
 301                 }
 302                 ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 303                 status = ASTATUS();
 304                 if (status & RESETflag) {
 305                         BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
 306                                 status);
 307                         BUGMSG2(D_INIT_REASONS, "S5: ");
 308                         BUGLVL(D_INIT_REASONS) numprint = 0;
 309                         release_region(*port, ARCNET_TOTAL_SIZE);
 310                         *port-- = ports[--numports];
 311                         continue;
 312                 }
 313                 /* skip this completely if an IRQ was given, because maybe
 314                  * we're on a machine that locks during autoirq!
 315                  */
 316                 if (!irq) {
 317                         /* if we do this, we're sure to get an IRQ since the
 318                          * card has just reset and the NORXflag is on until
 319                          * we tell it to start receiving.
 320                          */
 321                         airqmask = probe_irq_on();
 322                         AINTMASK(NORXflag);
 323                         udelay(1);
 324                         AINTMASK(0);
 325                         airq = probe_irq_off(airqmask);
 326
 327                         if (airq <= 0) {
 328                                 BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
 329                                 BUGMSG2(D_INIT_REASONS, "S5: ");
 330                                 BUGLVL(D_INIT_REASONS) numprint = 0;
 331                                 release_region(*port, ARCNET_TOTAL_SIZE);
 332                                 *port-- = ports[--numports];
 333                                 continue;
 334                         }
 335                 } else {
 336                         airq = irq;
 337                 }
 338
 339                 BUGMSG2(D_INIT, "(%d,", airq);
 340                 openparen = 1;
 341
 342                 /* Everything seems okay.  But which shmem, if any, puts
 343                  * back its signature byte when the card is reset?
 344                  *
 345                  * If there are multiple cards installed, there might be
 346                  * multiple shmems still in the list.
 347                  */
 348 #ifdef FAST_PROBE
 349                 if (numports > 1 || numshmems > 1) {
 350                         inb(_RESET);
 351                         mdelay(RESETtime);
 352                 } else {
 353                         /* just one shmem and port, assume they match */
 354                         isa_writeb(TESTvalue, shmems[0]);
 355                 }
 356 #else
 357                 inb(_RESET);
 358                 mdelay(RESETtime);
 359 #endif
 360
 361                 for (p = &shmems[0]; p < shmems + numshmems; p++) {
 362                         u_long ptr = *p;
 363
 364                         if (isa_readb(ptr) == TESTvalue) {      /* found one */
 365                                 BUGMSG2(D_INIT, "%lXh)\n", *p);
 366                                 openparen = 0;
 367
 368                                 /* register the card */
 369                                 if (com90xx_found(*port, airq, *p) == 0)
 370                                         found = 1;
 371                                 numprint = -1;
 372
 373                                 /* remove shmem from the list */
 374                                 *p = shmems[--numshmems];
 375                                 break;  /* go to the next I/O port */
 376                         } else {
 377                                 BUGMSG2(D_INIT_REASONS, "%Xh-", isa_readb(ptr));
 378                         }
 379                 }
 380
 381                 if (openparen) {
 382                         BUGLVL(D_INIT) printk("no matching shmem)\n");
 383                         BUGLVL(D_INIT_REASONS) printk("S5: ");
 384                         BUGLVL(D_INIT_REASONS) numprint = 0;
 385                 }
 386                 if (!found)
 387                         release_region(*port, ARCNET_TOTAL_SIZE);
 388                 *port-- = ports[--numports];
 389         }
 390
 391         BUGLVL(D_INIT_REASONS) printk("\n");
 392
 393         /* Now put back TESTvalue on all leftover shmems. */
 394         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 395                 isa_writeb(TESTvalue, *p);
 396                 release_mem_region(*p, BUFFER_SIZE);
 397         }
 398 }
 399
 400
 401 /* Set up the struct net_device associated with this card.  Called after
 402  * probing succeeds.
 403  */
 404 static int __init com90xx_found(int ioaddr, int airq, u_long shmem)
 405 {
 406         struct net_device *dev = NULL;
 407         struct arcnet_local *lp;
 408         u_long first_mirror, last_mirror;
 409         int mirror_size;
 410
 411         /* allocate struct net_device */
 412         dev = alloc_arcdev(device);
 413         if (!dev) {
 414                 BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!\n");
 415                 release_mem_region(shmem, BUFFER_SIZE);
 416                 return -ENOMEM;
 417         }
 418         lp = dev->priv;
 419         /* find the real shared memory start/end points, including mirrors */
 420
 421         /* guess the actual size of one "memory mirror" - the number of
 422          * bytes between copies of the shared memory.  On most cards, it's
 423          * 2k (or there are no mirrors at all) but on some, it's 4k.
 424          */
 425         mirror_size = MIRROR_SIZE;
 426         if (isa_readb(shmem) == TESTvalue
 427             && isa_readb(shmem - mirror_size) != TESTvalue
 428             && isa_readb(shmem - 2 * mirror_size) == TESTvalue)
 429                 mirror_size *= 2;
 430
 431         first_mirror = last_mirror = shmem;
 432         while (isa_readb(first_mirror) == TESTvalue)
 433                 first_mirror -= mirror_size;
 434         first_mirror += mirror_size;
 435
 436         while (isa_readb(last_mirror) == TESTvalue)
 437                 last_mirror += mirror_size;
 438         last_mirror -= mirror_size;
 439
 440         dev->mem_start = first_mirror;
 441         dev->mem_end = last_mirror + MIRROR_SIZE - 1;
 442
 443         release_mem_region(shmem, BUFFER_SIZE);
 444         if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
 445                 goto err_free_dev;
 446
 447         /* reserve the irq */
 448         if (request_irq(airq, &arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
 449                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", airq);
 450                 goto err_release_mem;
 451         }
 452         dev->irq = airq;
 453
 454         /* Initialize the rest of the device structure. */
 455         lp->card_name = "COM90xx";
 456         lp->hw.command = com90xx_command;
 457         lp->hw.status = com90xx_status;
 458         lp->hw.intmask = com90xx_setmask;
 459         lp->hw.reset = com90xx_reset;
 460         lp->hw.owner = THIS_MODULE;
 461         lp->hw.copy_to_card = com90xx_copy_to_card;
 462         lp->hw.copy_from_card = com90xx_copy_from_card;
 463         lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 464         if (!lp->mem_start) {
 465                 BUGMSG(D_NORMAL, "Can't remap device memory!\n");
 466                 goto err_free_irq;
 467         }
 468
 469         /* get and check the station ID from offset 1 in shmem */
 470         dev->dev_addr[0] = readb(lp->mem_start + 1);
 471
 472         dev->base_addr = ioaddr;
 473
 474         BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
 475                "ShMem %lXh (%ld*%xh).\n",
 476                dev->dev_addr[0],
 477                dev->base_addr, dev->irq, dev->mem_start,
 478          (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
 479
 480         if (register_netdev(dev))
 481                 goto err_unmap;
 482
 483         cards[numcards++] = dev;
 484         return 0;
 485
 486 err_unmap:
 487         iounmap(lp->mem_start);
 488 err_free_irq:
 489         free_irq(dev->irq, dev);
 490 err_release_mem:
 491         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 492 err_free_dev:
 493         free_netdev(dev);
 494         return -EIO;
 495 }
 496
 497
 498 static void com90xx_command(struct net_device *dev, int cmd)
 499 {
 500         short ioaddr = dev->base_addr;
 501
 502         ACOMMAND(cmd);
 503 }
 504
 505
 506 static int com90xx_status(struct net_device *dev)
 507 {
 508         short ioaddr = dev->base_addr;
 509
 510         return ASTATUS();
 511 }
 512
 513
 514 static void com90xx_setmask(struct net_device *dev, int mask)
 515 {
 516         short ioaddr = dev->base_addr;
 517
 518         AINTMASK(mask);
 519 }
 520
 521
 522 /*
 523  * Do a hardware reset on the card, and set up necessary registers.
 524  *
 525  * This should be called as little as possible, because it disrupts the
 526  * token on the network (causes a RECON) and requires a significant delay.
 527  *
 528  * However, it does make sure the card is in a defined state.
 529  */
 530 int com90xx_reset(struct net_device *dev, int really_reset)
 531 {
 532         struct arcnet_local *lp = dev->priv;
 533         short ioaddr = dev->base_addr;
 534
 535         BUGMSG(D_INIT, "Resetting (status=%02Xh)\n", ASTATUS());
 536
 537         if (really_reset) {
 538                 /* reset the card */
 539                 inb(_RESET);
 540                 mdelay(RESETtime);
 541         }
 542         ACOMMAND(CFLAGScmd | RESETclear);       /* clear flags & end reset */
 543         ACOMMAND(CFLAGScmd | CONFIGclear);
 544
 545         /* don't do this until we verify that it doesn't hurt older cards! */
 546         /* outb(inb(_CONFIG) | ENABLE16flag, _CONFIG); */
 547
 548         /* verify that the ARCnet signature byte is present */
 549         if (readb(lp->mem_start) != TESTvalue) {
 550                 if (really_reset)
 551                         BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 552                 return 1;
 553         }
 554         /* enable extended (512-byte) packets */
 555         ACOMMAND(CONFIGcmd | EXTconf);
 556
 557         /* clean out all the memory to make debugging make more sense :) */
 558         BUGLVL(D_DURING)
 559             memset_io(lp->mem_start, 0x42, 2048);
 560
 561         /* done!  return success. */
 562         return 0;
 563 }
 564
 565 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
 566                                  void *buf, int count)
 567 {
 568         struct arcnet_local *lp = dev->priv;
 569         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 570         TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 571 }
 572
 573
 574 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
 575                                    void *buf, int count)
 576 {
 577         struct arcnet_local *lp = dev->priv;
 578         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 579         TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 580 }
 581
 582
 583 MODULE_LICENSE("GPL");
 584
 585 static int __init com90xx_init(void)
 586 {
 587         if (irq == 2)
 588                 irq = 9;
 589         com90xx_probe();
 590         if (!numcards)
 591                 return -EIO;
 592         return 0;
 593 }
 594
 595 static void __exit com90xx_exit(void)
 596 {
 597         struct net_device *dev;
 598         struct arcnet_local *lp;
 599         int count;
 600
 601         for (count = 0; count < numcards; count++) {
 602                 dev = cards[count];
 603                 lp = dev->priv;
 604
 605                 unregister_netdev(dev);
 606                 free_irq(dev->irq, dev);
 607                 iounmap(lp->mem_start);
 608                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 609                 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 610                 free_netdev(dev);
 611         }
 612 }
 613
 614 module_init(com90xx_init);
 615 module_exit(com90xx_exit);
 616
 617 #ifndef MODULE
 618 static int __init com90xx_setup(char *s)
 619 {
 620         int ints[8];
 621
 622         s = get_options(s, 8, ints);
 623         if (!ints[0] && !*s) {
 624                 printk("com90xx: Disabled.\n");
 625                 return 1;
 626         }
 627
 628         switch (ints[0]) {
 629         default:                /* ERROR */
 630                 printk("com90xx: Too many arguments.\n");
 631         case 3:         /* Mem address */
 632                 shmem = ints[3];
 633         case 2:         /* IRQ */
 634                 irq = ints[2];
 635         case 1:         /* IO address */
 636                 io = ints[1];
 637         }
 638
 639         if (*s)
 640                 snprintf(device, sizeof(device), "%s", s);
 641
 642         return 1;
 643 }
 644
 645 __setup("com90xx=", com90xx_setup);
 646 #endif