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/interrupt.h>
  31 #include <linux/ioport.h>
  32 #include <linux/delay.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/slab.h>
  35 #include <asm/io.h>
  36 #include <linux/arcdevice.h>
  37
  38 #define VERSION "arcnet: COM90xx chipset support\n"
  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 /* Internal function declarations */
  55 static int com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *);
  56 static void com90xx_command(struct net_device *dev, int command);
  57 static int com90xx_status(struct net_device *dev);
  58 static void com90xx_setmask(struct net_device *dev, int mask);
  59 static int com90xx_reset(struct net_device *dev, int really_reset);
  60 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
  61                                  void *buf, int count);
  62 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
  63                                    void *buf, int count);
  64
  65 /* Known ARCnet cards */
  66
  67 static struct net_device *cards[16];
  68 static int numcards;
  69
  70 /* Handy defines for ARCnet specific stuff */
  71
  72 /* The number of low I/O ports used by the card */
  73 #define ARCNET_TOTAL_SIZE       16
  74
  75 /* Amount of I/O memory used by the card */
  76 #define BUFFER_SIZE (512)
  77 #define MIRROR_SIZE (BUFFER_SIZE * 4)
  78
  79 /* COM 9026 controller chip --> ARCnet register addresses */
  80 #define _INTMASK        (ioaddr + 0)    /* writable */
  81 #define _STATUS         (ioaddr + 0)    /* readable */
  82 #define _COMMAND        (ioaddr + 1)    /* writable, returns random vals on read (?) */
  83 #define _CONFIG         (ioaddr + 2)    /* Configuration register */
  84 #define _RESET          (ioaddr + 8)    /* software reset (on read) */
  85 #define _MEMDATA        (ioaddr + 12)   /* Data port for IO-mapped memory */
  86 #define _ADDR_HI        (ioaddr + 15)   /* Control registers for said */
  87 #define _ADDR_LO        (ioaddr + 14)
  88
  89 #undef ASTATUS
  90 #undef ACOMMAND
  91 #undef AINTMASK
  92
  93 #define ASTATUS()       inb(_STATUS)
  94 #define ACOMMAND(cmd)   outb((cmd), _COMMAND)
  95 #define AINTMASK(msk)   outb((msk), _INTMASK)
  96
  97 static int com90xx_skip_probe __initdata = 0;
  98
  99 /* Module parameters */
 100
 101 static int io;                  /* use the insmod io= irq= shmem= options */
 102 static int irq;
 103 static int shmem;
 104 static char device[9];          /* use eg. device=arc1 to change name */
 105
 106 module_param(io, int, 0);
 107 module_param(irq, int, 0);
 108 module_param(shmem, int, 0);
 109 module_param_string(device, device, sizeof(device), 0);
 110
 111 static void __init com90xx_probe(void)
 112 {
 113         int count, status, ioaddr, numprint, airq, openparen = 0;
 114         unsigned long airqmask;
 115         int ports[(0x3f0 - 0x200) / 16 + 1] =
 116         {0};
 117         unsigned long *shmems;
 118         void __iomem **iomem;
 119         int numports, numshmems, *port;
 120         u_long *p;
 121         int index;
 122
 123         if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
 124                 return;
 125
 126         shmems = kzalloc(((0x100000 - 0xa0000) / 0x800) * sizeof(unsigned long),
 127                          GFP_KERNEL);
 128         if (!shmems)
 129                 return;
 130         iomem = kzalloc(((0x100000 - 0xa0000) / 0x800) * sizeof(void __iomem *),
 131                         GFP_KERNEL);
 132         if (!iomem) {
 133                 kfree(shmems);
 134                 return;
 135         }
 136
 137         BUGLVL(D_NORMAL) printk(VERSION);
 138
 139         /* set up the arrays where we'll store the possible probe addresses */
 140         numports = numshmems = 0;
 141         if (io)
 142                 ports[numports++] = io;
 143         else
 144                 for (count = 0x200; count <= 0x3f0; count += 16)
 145                         ports[numports++] = count;
 146         if (shmem)
 147                 shmems[numshmems++] = shmem;
 148         else
 149                 for (count = 0xA0000; count <= 0xFF800; count += 2048)
 150                         shmems[numshmems++] = count;
 151
 152         /* Stage 1: abandon any reserved ports, or ones with status==0xFF
 153          * (empty), and reset any others by reading the reset port.
 154          */
 155         numprint = -1;
 156         for (port = &ports[0]; port - ports < numports; port++) {
 157                 numprint++;
 158                 numprint %= 8;
 159                 if (!numprint) {
 160                         BUGMSG2(D_INIT, "\n");
 161                         BUGMSG2(D_INIT, "S1: ");
 162                 }
 163                 BUGMSG2(D_INIT, "%Xh ", *port);
 164
 165                 ioaddr = *port;
 166
 167                 if (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
 168                         BUGMSG2(D_INIT_REASONS, "(request_region)\n");
 169                         BUGMSG2(D_INIT_REASONS, "S1: ");
 170                         BUGLVL(D_INIT_REASONS) numprint = 0;
 171                         *port-- = ports[--numports];
 172                         continue;
 173                 }
 174                 if (ASTATUS() == 0xFF) {
 175                         BUGMSG2(D_INIT_REASONS, "(empty)\n");
 176                         BUGMSG2(D_INIT_REASONS, "S1: ");
 177                         BUGLVL(D_INIT_REASONS) numprint = 0;
 178                         release_region(*port, ARCNET_TOTAL_SIZE);
 179                         *port-- = ports[--numports];
 180                         continue;
 181                 }
 182                 inb(_RESET);    /* begin resetting card */
 183
 184                 BUGMSG2(D_INIT_REASONS, "\n");
 185                 BUGMSG2(D_INIT_REASONS, "S1: ");
 186                 BUGLVL(D_INIT_REASONS) numprint = 0;
 187         }
 188         BUGMSG2(D_INIT, "\n");
 189
 190         if (!numports) {
 191                 BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.\n");
 192                 kfree(shmems);
 193                 kfree(iomem);
 194                 return;
 195         }
 196         /* Stage 2: we have now reset any possible ARCnet cards, so we can't
 197          * do anything until they finish.  If D_INIT, print the list of
 198          * cards that are left.
 199          */
 200         numprint = -1;
 201         for (port = &ports[0]; port < ports + numports; port++) {
 202                 numprint++;
 203                 numprint %= 8;
 204                 if (!numprint) {
 205                         BUGMSG2(D_INIT, "\n");
 206                         BUGMSG2(D_INIT, "S2: ");
 207                 }
 208                 BUGMSG2(D_INIT, "%Xh ", *port);
 209         }
 210         BUGMSG2(D_INIT, "\n");
 211         mdelay(RESETtime);
 212
 213         /* Stage 3: abandon any shmem addresses that don't have the signature
 214          * 0xD1 byte in the right place, or are read-only.
 215          */
 216         numprint = -1;
 217         for (index = 0, p = &shmems[0]; index < numshmems; p++, index++) {
 218                 void __iomem *base;
 219
 220                 numprint++;
 221                 numprint %= 8;
 222                 if (!numprint) {
 223                         BUGMSG2(D_INIT, "\n");
 224                         BUGMSG2(D_INIT, "S3: ");
 225                 }
 226                 BUGMSG2(D_INIT, "%lXh ", *p);
 227
 228                 if (!request_mem_region(*p, MIRROR_SIZE, "arcnet (90xx)")) {
 229                         BUGMSG2(D_INIT_REASONS, "(request_mem_region)\n");
 230                         BUGMSG2(D_INIT_REASONS, "Stage 3: ");
 231                         BUGLVL(D_INIT_REASONS) numprint = 0;
 232                         goto out;
 233                 }
 234                 base = ioremap(*p, MIRROR_SIZE);
 235                 if (!base) {
 236                         BUGMSG2(D_INIT_REASONS, "(ioremap)\n");
 237                         BUGMSG2(D_INIT_REASONS, "Stage 3: ");
 238                         BUGLVL(D_INIT_REASONS) numprint = 0;
 239                         goto out1;
 240                 }
 241                 if (readb(base) != TESTvalue) {
 242                         BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
 243                                 readb(base), TESTvalue);
 244                         BUGMSG2(D_INIT_REASONS, "S3: ");
 245                         BUGLVL(D_INIT_REASONS) numprint = 0;
 246                         goto out2;
 247                 }
 248                 /* By writing 0x42 to the TESTvalue location, we also make
 249                  * sure no "mirror" shmem areas show up - if they occur
 250                  * in another pass through this loop, they will be discarded
 251                  * because *cptr != TESTvalue.
 252                  */
 253                 writeb(0x42, base);
 254                 if (readb(base) != 0x42) {
 255                         BUGMSG2(D_INIT_REASONS, "(read only)\n");
 256                         BUGMSG2(D_INIT_REASONS, "S3: ");
 257                         goto out2;
 258                 }
 259                 BUGMSG2(D_INIT_REASONS, "\n");
 260                 BUGMSG2(D_INIT_REASONS, "S3: ");
 261                 BUGLVL(D_INIT_REASONS) numprint = 0;
 262                 iomem[index] = base;
 263                 continue;
 264         out2:
 265                 iounmap(base);
 266         out1:
 267                 release_mem_region(*p, MIRROR_SIZE);
 268         out:
 269                 *p-- = shmems[--numshmems];
 270                 index--;
 271         }
 272         BUGMSG2(D_INIT, "\n");
 273
 274         if (!numshmems) {
 275                 BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.\n");
 276                 for (port = &ports[0]; port < ports + numports; port++)
 277                         release_region(*port, ARCNET_TOTAL_SIZE);
 278                 kfree(shmems);
 279                 kfree(iomem);
 280                 return;
 281         }
 282         /* Stage 4: something of a dummy, to report the shmems that are
 283          * still possible after stage 3.
 284          */
 285         numprint = -1;
 286         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 287                 numprint++;
 288                 numprint %= 8;
 289                 if (!numprint) {
 290                         BUGMSG2(D_INIT, "\n");
 291                         BUGMSG2(D_INIT, "S4: ");
 292                 }
 293                 BUGMSG2(D_INIT, "%lXh ", *p);
 294         }
 295         BUGMSG2(D_INIT, "\n");
 296
 297         /* Stage 5: for any ports that have the correct status, can disable
 298          * the RESET flag, and (if no irq is given) generate an autoirq,
 299          * register an ARCnet device.
 300          *
 301          * Currently, we can only register one device per probe, so quit
 302          * after the first one is found.
 303          */
 304         numprint = -1;
 305         for (port = &ports[0]; port < ports + numports; port++) {
 306                 int found = 0;
 307
 308                 numprint++;
 309                 numprint %= 8;
 310                 if (!numprint) {
 311                         BUGMSG2(D_INIT, "\n");
 312                         BUGMSG2(D_INIT, "S5: ");
 313                 }
 314                 BUGMSG2(D_INIT, "%Xh ", *port);
 315
 316                 ioaddr = *port;
 317                 status = ASTATUS();
 318
 319                 if ((status & 0x9D)
 320                     != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 321                         BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
 322                         BUGMSG2(D_INIT_REASONS, "S5: ");
 323                         BUGLVL(D_INIT_REASONS) numprint = 0;
 324                         release_region(*port, ARCNET_TOTAL_SIZE);
 325                         *port-- = ports[--numports];
 326                         continue;
 327                 }
 328                 ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 329                 status = ASTATUS();
 330                 if (status & RESETflag) {
 331                         BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
 332                                 status);
 333                         BUGMSG2(D_INIT_REASONS, "S5: ");
 334                         BUGLVL(D_INIT_REASONS) numprint = 0;
 335                         release_region(*port, ARCNET_TOTAL_SIZE);
 336                         *port-- = ports[--numports];
 337                         continue;
 338                 }
 339                 /* skip this completely if an IRQ was given, because maybe
 340                  * we're on a machine that locks during autoirq!
 341                  */
 342                 if (!irq) {
 343                         /* if we do this, we're sure to get an IRQ since the
 344                          * card has just reset and the NORXflag is on until
 345                          * we tell it to start receiving.
 346                          */
 347                         airqmask = probe_irq_on();
 348                         AINTMASK(NORXflag);
 349                         udelay(1);
 350                         AINTMASK(0);
 351                         airq = probe_irq_off(airqmask);
 352
 353                         if (airq <= 0) {
 354                                 BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
 355                                 BUGMSG2(D_INIT_REASONS, "S5: ");
 356                                 BUGLVL(D_INIT_REASONS) numprint = 0;
 357                                 release_region(*port, ARCNET_TOTAL_SIZE);
 358                                 *port-- = ports[--numports];
 359                                 continue;
 360                         }
 361                 } else {
 362                         airq = irq;
 363                 }
 364
 365                 BUGMSG2(D_INIT, "(%d,", airq);
 366                 openparen = 1;
 367
 368                 /* Everything seems okay.  But which shmem, if any, puts
 369                  * back its signature byte when the card is reset?
 370                  *
 371                  * If there are multiple cards installed, there might be
 372                  * multiple shmems still in the list.
 373                  */
 374 #ifdef FAST_PROBE
 375                 if (numports > 1 || numshmems > 1) {
 376                         inb(_RESET);
 377                         mdelay(RESETtime);
 378                 } else {
 379                         /* just one shmem and port, assume they match */
 380                         writeb(TESTvalue, iomem[0]);
 381                 }
 382 #else
 383                 inb(_RESET);
 384                 mdelay(RESETtime);
 385 #endif
 386
 387                 for (index = 0; index < numshmems; index++) {
 388                         u_long ptr = shmems[index];
 389                         void __iomem *base = iomem[index];
 390
 391                         if (readb(base) == TESTvalue) { /* found one */
 392                                 BUGMSG2(D_INIT, "%lXh)\n", *p);
 393                                 openparen = 0;
 394
 395                                 /* register the card */
 396                                 if (com90xx_found(*port, airq, ptr, base) == 0)
 397                                         found = 1;
 398                                 numprint = -1;
 399
 400                                 /* remove shmem from the list */
 401                                 shmems[index] = shmems[--numshmems];
 402                                 iomem[index] = iomem[numshmems];
 403                                 break;  /* go to the next I/O port */
 404                         } else {
 405                                 BUGMSG2(D_INIT_REASONS, "%Xh-", readb(base));
 406                         }
 407                 }
 408
 409                 if (openparen) {
 410                         BUGLVL(D_INIT) printk("no matching shmem)\n");
 411                         BUGLVL(D_INIT_REASONS) printk("S5: ");
 412                         BUGLVL(D_INIT_REASONS) numprint = 0;
 413                 }
 414                 if (!found)
 415                         release_region(*port, ARCNET_TOTAL_SIZE);
 416                 *port-- = ports[--numports];
 417         }
 418
 419         BUGLVL(D_INIT_REASONS) printk("\n");
 420
 421         /* Now put back TESTvalue on all leftover shmems. */
 422         for (index = 0; index < numshmems; index++) {
 423                 writeb(TESTvalue, iomem[index]);
 424                 iounmap(iomem[index]);
 425                 release_mem_region(shmems[index], MIRROR_SIZE);
 426         }
 427         kfree(shmems);
 428         kfree(iomem);
 429 }
 430
 431 static int check_mirror(unsigned long addr, size_t size)
 432 {
 433         void __iomem *p;
 434         int res = -1;
 435
 436         if (!request_mem_region(addr, size, "arcnet (90xx)"))
 437                 return -1;
 438
 439         p = ioremap(addr, size);
 440         if (p) {
 441                 if (readb(p) == TESTvalue)
 442                         res = 1;
 443                 else
 444                         res = 0;
 445                 iounmap(p);
 446         }
 447
 448         release_mem_region(addr, size);
 449         return res;
 450 }
 451
 452 /* Set up the struct net_device associated with this card.  Called after
 453  * probing succeeds.
 454  */
 455 static int __init com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *p)
 456 {
 457         struct net_device *dev = NULL;
 458         struct arcnet_local *lp;
 459         u_long first_mirror, last_mirror;
 460         int mirror_size;
 461
 462         /* allocate struct net_device */
 463         dev = alloc_arcdev(device);
 464         if (!dev) {
 465                 BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!\n");
 466                 iounmap(p);
 467                 release_mem_region(shmem, MIRROR_SIZE);
 468                 return -ENOMEM;
 469         }
 470         lp = netdev_priv(dev);
 471         /* find the real shared memory start/end points, including mirrors */
 472
 473         /* guess the actual size of one "memory mirror" - the number of
 474          * bytes between copies of the shared memory.  On most cards, it's
 475          * 2k (or there are no mirrors at all) but on some, it's 4k.
 476          */
 477         mirror_size = MIRROR_SIZE;
 478         if (readb(p) == TESTvalue &&
 479             check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
 480             check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
 481                 mirror_size = 2 * MIRROR_SIZE;
 482
 483         first_mirror = shmem - mirror_size;
 484         while (check_mirror(first_mirror, mirror_size) == 1)
 485                 first_mirror -= mirror_size;
 486         first_mirror += mirror_size;
 487
 488         last_mirror = shmem + mirror_size;
 489         while (check_mirror(last_mirror, mirror_size) == 1)
 490                 last_mirror += mirror_size;
 491         last_mirror -= mirror_size;
 492
 493         dev->mem_start = first_mirror;
 494         dev->mem_end = last_mirror + MIRROR_SIZE - 1;
 495
 496         iounmap(p);
 497         release_mem_region(shmem, MIRROR_SIZE);
 498
 499         if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
 500                 goto err_free_dev;
 501
 502         /* reserve the irq */
 503         if (request_irq(airq, arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
 504                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", airq);
 505                 goto err_release_mem;
 506         }
 507         dev->irq = airq;
 508
 509         /* Initialize the rest of the device structure. */
 510         lp->card_name = "COM90xx";
 511         lp->hw.command = com90xx_command;
 512         lp->hw.status = com90xx_status;
 513         lp->hw.intmask = com90xx_setmask;
 514         lp->hw.reset = com90xx_reset;
 515         lp->hw.owner = THIS_MODULE;
 516         lp->hw.copy_to_card = com90xx_copy_to_card;
 517         lp->hw.copy_from_card = com90xx_copy_from_card;
 518         lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 519         if (!lp->mem_start) {
 520                 BUGMSG(D_NORMAL, "Can't remap device memory!\n");
 521                 goto err_free_irq;
 522         }
 523
 524         /* get and check the station ID from offset 1 in shmem */
 525         dev->dev_addr[0] = readb(lp->mem_start + 1);
 526
 527         dev->base_addr = ioaddr;
 528
 529         BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
 530                "ShMem %lXh (%ld*%xh).\n",
 531                dev->dev_addr[0],
 532                dev->base_addr, dev->irq, dev->mem_start,
 533          (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
 534
 535         if (register_netdev(dev))
 536                 goto err_unmap;
 537
 538         cards[numcards++] = dev;
 539         return 0;
 540
 541 err_unmap:
 542         iounmap(lp->mem_start);
 543 err_free_irq:
 544         free_irq(dev->irq, dev);
 545 err_release_mem:
 546         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 547 err_free_dev:
 548         free_netdev(dev);
 549         return -EIO;
 550 }
 551
 552 static void com90xx_command(struct net_device *dev, int cmd)
 553 {
 554         short ioaddr = dev->base_addr;
 555
 556         ACOMMAND(cmd);
 557 }
 558
 559 static int com90xx_status(struct net_device *dev)
 560 {
 561         short ioaddr = dev->base_addr;
 562
 563         return ASTATUS();
 564 }
 565
 566 static void com90xx_setmask(struct net_device *dev, int mask)
 567 {
 568         short ioaddr = dev->base_addr;
 569
 570         AINTMASK(mask);
 571 }
 572
 573 /*
 574  * Do a hardware reset on the card, and set up necessary registers.
 575  *
 576  * This should be called as little as possible, because it disrupts the
 577  * token on the network (causes a RECON) and requires a significant delay.
 578  *
 579  * However, it does make sure the card is in a defined state.
 580  */
 581 static int com90xx_reset(struct net_device *dev, int really_reset)
 582 {
 583         struct arcnet_local *lp = netdev_priv(dev);
 584         short ioaddr = dev->base_addr;
 585
 586         BUGMSG(D_INIT, "Resetting (status=%02Xh)\n", ASTATUS());
 587
 588         if (really_reset) {
 589                 /* reset the card */
 590                 inb(_RESET);
 591                 mdelay(RESETtime);
 592         }
 593         ACOMMAND(CFLAGScmd | RESETclear);       /* clear flags & end reset */
 594         ACOMMAND(CFLAGScmd | CONFIGclear);
 595
 596         /* don't do this until we verify that it doesn't hurt older cards! */
 597         /* outb(inb(_CONFIG) | ENABLE16flag, _CONFIG); */
 598
 599         /* verify that the ARCnet signature byte is present */
 600         if (readb(lp->mem_start) != TESTvalue) {
 601                 if (really_reset)
 602                         BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 603                 return 1;
 604         }
 605         /* enable extended (512-byte) packets */
 606         ACOMMAND(CONFIGcmd | EXTconf);
 607
 608         /* clean out all the memory to make debugging make more sense :) */
 609         BUGLVL(D_DURING)
 610             memset_io(lp->mem_start, 0x42, 2048);
 611
 612         /* done!  return success. */
 613         return 0;
 614 }
 615
 616 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
 617                                  void *buf, int count)
 618 {
 619         struct arcnet_local *lp = netdev_priv(dev);
 620         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 621
 622         TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 623 }
 624
 625 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
 626                                    void *buf, int count)
 627 {
 628         struct arcnet_local *lp = netdev_priv(dev);
 629         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 630
 631         TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 632 }
 633
 634 MODULE_LICENSE("GPL");
 635
 636 static int __init com90xx_init(void)
 637 {
 638         if (irq == 2)
 639                 irq = 9;
 640         com90xx_probe();
 641         if (!numcards)
 642                 return -EIO;
 643         return 0;
 644 }
 645
 646 static void __exit com90xx_exit(void)
 647 {
 648         struct net_device *dev;
 649         struct arcnet_local *lp;
 650         int count;
 651
 652         for (count = 0; count < numcards; count++) {
 653                 dev = cards[count];
 654                 lp = netdev_priv(dev);
 655
 656                 unregister_netdev(dev);
 657                 free_irq(dev->irq, dev);
 658                 iounmap(lp->mem_start);
 659                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 660                 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 661                 free_netdev(dev);
 662         }
 663 }
 664
 665 module_init(com90xx_init);
 666 module_exit(com90xx_exit);
 667
 668 #ifndef MODULE
 669 static int __init com90xx_setup(char *s)
 670 {
 671         int ints[8];
 672
 673         s = get_options(s, 8, ints);
 674         if (!ints[0] && !*s) {
 675                 printk("com90xx: Disabled.\n");
 676                 return 1;
 677         }
 678
 679         switch (ints[0]) {
 680         default:                /* ERROR */
 681                 printk("com90xx: Too many arguments.\n");
 682         case 3:         /* Mem address */
 683                 shmem = ints[3];
 684         case 2:         /* IRQ */
 685                 irq = ints[2];
 686         case 1:         /* IO address */
 687                 io = ints[1];
 688         }
 689
 690         if (*s)
 691                 snprintf(device, sizeof(device), "%s", s);
 692
 693         return 1;
 694 }
 695
 696 __setup("com90xx=", com90xx_setup);
 697 #endif