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
  39 #define VERSION "arcnet: COM90xx chipset support\n"
  40
  41
  42 /* Define this to speed up the autoprobe by assuming if only one io port and
  43  * shmem are left in the list at Stage 5, they must correspond to each
  44  * other.
  45  *
  46  * This is undefined by default because it might not always be true, and the
  47  * extra check makes the autoprobe even more careful.  Speed demons can turn
  48  * it on - I think it should be fine if you only have one ARCnet card
  49  * installed.
  50  *
  51  * If no ARCnet cards are installed, this delay never happens anyway and thus
  52  * the option has no effect.
  53  */
  54 #undef FAST_PROBE
  55
  56
  57 /* Internal function declarations */
  58 static int com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *);
  59 static void com90xx_command(struct net_device *dev, int command);
  60 static int com90xx_status(struct net_device *dev);
  61 static void com90xx_setmask(struct net_device *dev, int mask);
  62 static int com90xx_reset(struct net_device *dev, int really_reset);
  63 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
  64                                  void *buf, int count);
  65 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
  66                                    void *buf, int count);
  67
  68 /* Known ARCnet cards */
  69
  70 static struct net_device *cards[16];
  71 static int numcards;
  72
  73 /* Handy defines for ARCnet specific stuff */
  74
  75 /* The number of low I/O ports used by the card */
  76 #define ARCNET_TOTAL_SIZE       16
  77
  78 /* Amount of I/O memory used by the card */
  79 #define BUFFER_SIZE (512)
  80 #define MIRROR_SIZE (BUFFER_SIZE*4)
  81
  82 /* COM 9026 controller chip --> ARCnet register addresses */
  83 #define _INTMASK (ioaddr+0)     /* writable */
  84 #define _STATUS  (ioaddr+0)     /* readable */
  85 #define _COMMAND (ioaddr+1)     /* writable, returns random vals on read (?) */
  86 #define _CONFIG  (ioaddr+2)     /* Configuration register */
  87 #define _RESET   (ioaddr+8)     /* software reset (on read) */
  88 #define _MEMDATA (ioaddr+12)    /* Data port for IO-mapped memory */
  89 #define _ADDR_HI (ioaddr+15)    /* Control registers for said */
  90 #define _ADDR_LO (ioaddr+14)
  91
  92 #undef ASTATUS
  93 #undef ACOMMAND
  94 #undef AINTMASK
  95
  96 #define ASTATUS()       inb(_STATUS)
  97 #define ACOMMAND(cmd)   outb((cmd),_COMMAND)
  98 #define AINTMASK(msk)   outb((msk),_INTMASK)
  99
 100
 101 static int com90xx_skip_probe __initdata = 0;
 102
 103 /* Module parameters */
 104
 105 static int io;                  /* use the insmod io= irq= shmem= options */
 106 static int irq;
 107 static int shmem;
 108 static char device[9];          /* use eg. device=arc1 to change name */
 109
 110 module_param(io, int, 0);
 111 module_param(irq, int, 0);
 112 module_param(shmem, int, 0);
 113 module_param_string(device, device, sizeof(device), 0);
 114
 115 static void __init com90xx_probe(void)
 116 {
 117         int count, status, ioaddr, numprint, airq, openparen = 0;
 118         unsigned long airqmask;
 119         int ports[(0x3f0 - 0x200) / 16 + 1] =
 120         {0};
 121         unsigned long *shmems;
 122         void __iomem **iomem;
 123         int numports, numshmems, *port;
 124         u_long *p;
 125         int index;
 126
 127         if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
 128                 return;
 129
 130         shmems = kzalloc(((0x100000-0xa0000) / 0x800) * sizeof(unsigned long),
 131                          GFP_KERNEL);
 132         if (!shmems)
 133                 return;
 134         iomem = kzalloc(((0x100000-0xa0000) / 0x800) * sizeof(void __iomem *),
 135                          GFP_KERNEL);
 136         if (!iomem) {
 137                 kfree(shmems);
 138                 return;
 139         }
 140
 141         BUGLVL(D_NORMAL) printk(VERSION);
 142
 143         /* set up the arrays where we'll store the possible probe addresses */
 144         numports = numshmems = 0;
 145         if (io)
 146                 ports[numports++] = io;
 147         else
 148                 for (count = 0x200; count <= 0x3f0; count += 16)
 149                         ports[numports++] = count;
 150         if (shmem)
 151                 shmems[numshmems++] = shmem;
 152         else
 153                 for (count = 0xA0000; count <= 0xFF800; count += 2048)
 154                         shmems[numshmems++] = count;
 155
 156         /* Stage 1: abandon any reserved ports, or ones with status==0xFF
 157          * (empty), and reset any others by reading the reset port.
 158          */
 159         numprint = -1;
 160         for (port = &ports[0]; port - ports < numports; port++) {
 161                 numprint++;
 162                 numprint %= 8;
 163                 if (!numprint) {
 164                         BUGMSG2(D_INIT, "\n");
 165                         BUGMSG2(D_INIT, "S1: ");
 166                 }
 167                 BUGMSG2(D_INIT, "%Xh ", *port);
 168
 169                 ioaddr = *port;
 170
 171                 if (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
 172                         BUGMSG2(D_INIT_REASONS, "(request_region)\n");
 173                         BUGMSG2(D_INIT_REASONS, "S1: ");
 174                         BUGLVL(D_INIT_REASONS) numprint = 0;
 175                         *port-- = ports[--numports];
 176                         continue;
 177                 }
 178                 if (ASTATUS() == 0xFF) {
 179                         BUGMSG2(D_INIT_REASONS, "(empty)\n");
 180                         BUGMSG2(D_INIT_REASONS, "S1: ");
 181                         BUGLVL(D_INIT_REASONS) numprint = 0;
 182                         release_region(*port, ARCNET_TOTAL_SIZE);
 183                         *port-- = ports[--numports];
 184                         continue;
 185                 }
 186                 inb(_RESET);    /* begin resetting card */
 187
 188                 BUGMSG2(D_INIT_REASONS, "\n");
 189                 BUGMSG2(D_INIT_REASONS, "S1: ");
 190                 BUGLVL(D_INIT_REASONS) numprint = 0;
 191         }
 192         BUGMSG2(D_INIT, "\n");
 193
 194         if (!numports) {
 195                 BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.\n");
 196                 kfree(shmems);
 197                 kfree(iomem);
 198                 return;
 199         }
 200         /* Stage 2: we have now reset any possible ARCnet cards, so we can't
 201          * do anything until they finish.  If D_INIT, print the list of
 202          * cards that are left.
 203          */
 204         numprint = -1;
 205         for (port = &ports[0]; port < ports + numports; port++) {
 206                 numprint++;
 207                 numprint %= 8;
 208                 if (!numprint) {
 209                         BUGMSG2(D_INIT, "\n");
 210                         BUGMSG2(D_INIT, "S2: ");
 211                 }
 212                 BUGMSG2(D_INIT, "%Xh ", *port);
 213         }
 214         BUGMSG2(D_INIT, "\n");
 215         mdelay(RESETtime);
 216
 217         /* Stage 3: abandon any shmem addresses that don't have the signature
 218          * 0xD1 byte in the right place, or are read-only.
 219          */
 220         numprint = -1;
 221         for (index = 0, p = &shmems[0]; index < numshmems; p++, index++) {
 222                 void __iomem *base;
 223
 224                 numprint++;
 225                 numprint %= 8;
 226                 if (!numprint) {
 227                         BUGMSG2(D_INIT, "\n");
 228                         BUGMSG2(D_INIT, "S3: ");
 229                 }
 230                 BUGMSG2(D_INIT, "%lXh ", *p);
 231
 232                 if (!request_mem_region(*p, MIRROR_SIZE, "arcnet (90xx)")) {
 233                         BUGMSG2(D_INIT_REASONS, "(request_mem_region)\n");
 234                         BUGMSG2(D_INIT_REASONS, "Stage 3: ");
 235                         BUGLVL(D_INIT_REASONS) numprint = 0;
 236                         goto out;
 237                 }
 238                 base = ioremap(*p, MIRROR_SIZE);
 239                 if (!base) {
 240                         BUGMSG2(D_INIT_REASONS, "(ioremap)\n");
 241                         BUGMSG2(D_INIT_REASONS, "Stage 3: ");
 242                         BUGLVL(D_INIT_REASONS) numprint = 0;
 243                         goto out1;
 244                 }
 245                 if (readb(base) != TESTvalue) {
 246                         BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
 247                                 readb(base), TESTvalue);
 248                         BUGMSG2(D_INIT_REASONS, "S3: ");
 249                         BUGLVL(D_INIT_REASONS) numprint = 0;
 250                         goto out2;
 251                 }
 252                 /* By writing 0x42 to the TESTvalue location, we also make
 253                  * sure no "mirror" shmem areas show up - if they occur
 254                  * in another pass through this loop, they will be discarded
 255                  * because *cptr != TESTvalue.
 256                  */
 257                 writeb(0x42, base);
 258                 if (readb(base) != 0x42) {
 259                         BUGMSG2(D_INIT_REASONS, "(read only)\n");
 260                         BUGMSG2(D_INIT_REASONS, "S3: ");
 261                         goto out2;
 262                 }
 263                 BUGMSG2(D_INIT_REASONS, "\n");
 264                 BUGMSG2(D_INIT_REASONS, "S3: ");
 265                 BUGLVL(D_INIT_REASONS) numprint = 0;
 266                 iomem[index] = base;
 267                 continue;
 268         out2:
 269                 iounmap(base);
 270         out1:
 271                 release_mem_region(*p, MIRROR_SIZE);
 272         out:
 273                 *p-- = shmems[--numshmems];
 274                 index--;
 275         }
 276         BUGMSG2(D_INIT, "\n");
 277
 278         if (!numshmems) {
 279                 BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.\n");
 280                 for (port = &ports[0]; port < ports + numports; port++)
 281                         release_region(*port, ARCNET_TOTAL_SIZE);
 282                 kfree(shmems);
 283                 kfree(iomem);
 284                 return;
 285         }
 286         /* Stage 4: something of a dummy, to report the shmems that are
 287          * still possible after stage 3.
 288          */
 289         numprint = -1;
 290         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 291                 numprint++;
 292                 numprint %= 8;
 293                 if (!numprint) {
 294                         BUGMSG2(D_INIT, "\n");
 295                         BUGMSG2(D_INIT, "S4: ");
 296                 }
 297                 BUGMSG2(D_INIT, "%lXh ", *p);
 298         }
 299         BUGMSG2(D_INIT, "\n");
 300
 301         /* Stage 5: for any ports that have the correct status, can disable
 302          * the RESET flag, and (if no irq is given) generate an autoirq,
 303          * register an ARCnet device.
 304          *
 305          * Currently, we can only register one device per probe, so quit
 306          * after the first one is found.
 307          */
 308         numprint = -1;
 309         for (port = &ports[0]; port < ports + numports; port++) {
 310                 int found = 0;
 311                 numprint++;
 312                 numprint %= 8;
 313                 if (!numprint) {
 314                         BUGMSG2(D_INIT, "\n");
 315                         BUGMSG2(D_INIT, "S5: ");
 316                 }
 317                 BUGMSG2(D_INIT, "%Xh ", *port);
 318
 319                 ioaddr = *port;
 320                 status = ASTATUS();
 321
 322                 if ((status & 0x9D)
 323                     != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 324                         BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
 325                         BUGMSG2(D_INIT_REASONS, "S5: ");
 326                         BUGLVL(D_INIT_REASONS) numprint = 0;
 327                         release_region(*port, ARCNET_TOTAL_SIZE);
 328                         *port-- = ports[--numports];
 329                         continue;
 330                 }
 331                 ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 332                 status = ASTATUS();
 333                 if (status & RESETflag) {
 334                         BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
 335                                 status);
 336                         BUGMSG2(D_INIT_REASONS, "S5: ");
 337                         BUGLVL(D_INIT_REASONS) numprint = 0;
 338                         release_region(*port, ARCNET_TOTAL_SIZE);
 339                         *port-- = ports[--numports];
 340                         continue;
 341                 }
 342                 /* skip this completely if an IRQ was given, because maybe
 343                  * we're on a machine that locks during autoirq!
 344                  */
 345                 if (!irq) {
 346                         /* if we do this, we're sure to get an IRQ since the
 347                          * card has just reset and the NORXflag is on until
 348                          * we tell it to start receiving.
 349                          */
 350                         airqmask = probe_irq_on();
 351                         AINTMASK(NORXflag);
 352                         udelay(1);
 353                         AINTMASK(0);
 354                         airq = probe_irq_off(airqmask);
 355
 356                         if (airq <= 0) {
 357                                 BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
 358                                 BUGMSG2(D_INIT_REASONS, "S5: ");
 359                                 BUGLVL(D_INIT_REASONS) numprint = 0;
 360                                 release_region(*port, ARCNET_TOTAL_SIZE);
 361                                 *port-- = ports[--numports];
 362                                 continue;
 363                         }
 364                 } else {
 365                         airq = irq;
 366                 }
 367
 368                 BUGMSG2(D_INIT, "(%d,", airq);
 369                 openparen = 1;
 370
 371                 /* Everything seems okay.  But which shmem, if any, puts
 372                  * back its signature byte when the card is reset?
 373                  *
 374                  * If there are multiple cards installed, there might be
 375                  * multiple shmems still in the list.
 376                  */
 377 #ifdef FAST_PROBE
 378                 if (numports > 1 || numshmems > 1) {
 379                         inb(_RESET);
 380                         mdelay(RESETtime);
 381                 } else {
 382                         /* just one shmem and port, assume they match */
 383                         writeb(TESTvalue, iomem[0]);
 384                 }
 385 #else
 386                 inb(_RESET);
 387                 mdelay(RESETtime);
 388 #endif
 389
 390                 for (index = 0; index < numshmems; index++) {
 391                         u_long ptr = shmems[index];
 392                         void __iomem *base = iomem[index];
 393
 394                         if (readb(base) == TESTvalue) { /* found one */
 395                                 BUGMSG2(D_INIT, "%lXh)\n", *p);
 396                                 openparen = 0;
 397
 398                                 /* register the card */
 399                                 if (com90xx_found(*port, airq, ptr, base) == 0)
 400                                         found = 1;
 401                                 numprint = -1;
 402
 403                                 /* remove shmem from the list */
 404                                 shmems[index] = shmems[--numshmems];
 405                                 iomem[index] = iomem[numshmems];
 406                                 break;  /* go to the next I/O port */
 407                         } else {
 408                                 BUGMSG2(D_INIT_REASONS, "%Xh-", readb(base));
 409                         }
 410                 }
 411
 412                 if (openparen) {
 413                         BUGLVL(D_INIT) printk("no matching shmem)\n");
 414                         BUGLVL(D_INIT_REASONS) printk("S5: ");
 415                         BUGLVL(D_INIT_REASONS) numprint = 0;
 416                 }
 417                 if (!found)
 418                         release_region(*port, ARCNET_TOTAL_SIZE);
 419                 *port-- = ports[--numports];
 420         }
 421
 422         BUGLVL(D_INIT_REASONS) printk("\n");
 423
 424         /* Now put back TESTvalue on all leftover shmems. */
 425         for (index = 0; index < numshmems; index++) {
 426                 writeb(TESTvalue, iomem[index]);
 427                 iounmap(iomem[index]);
 428                 release_mem_region(shmems[index], MIRROR_SIZE);
 429         }
 430         kfree(shmems);
 431         kfree(iomem);
 432 }
 433
 434 static int check_mirror(unsigned long addr, size_t size)
 435 {
 436         void __iomem *p;
 437         int res = -1;
 438
 439         if (!request_mem_region(addr, size, "arcnet (90xx)"))
 440                 return -1;
 441
 442         p = ioremap(addr, size);
 443         if (p) {
 444                 if (readb(p) == TESTvalue)
 445                         res = 1;
 446                 else
 447                         res = 0;
 448                 iounmap(p);
 449         }
 450
 451         release_mem_region(addr, size);
 452         return res;
 453 }
 454
 455 /* Set up the struct net_device associated with this card.  Called after
 456  * probing succeeds.
 457  */
 458 static int __init com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *p)
 459 {
 460         struct net_device *dev = NULL;
 461         struct arcnet_local *lp;
 462         u_long first_mirror, last_mirror;
 463         int mirror_size;
 464
 465         /* allocate struct net_device */
 466         dev = alloc_arcdev(device);
 467         if (!dev) {
 468                 BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!\n");
 469                 iounmap(p);
 470                 release_mem_region(shmem, MIRROR_SIZE);
 471                 return -ENOMEM;
 472         }
 473         lp = netdev_priv(dev);
 474         /* find the real shared memory start/end points, including mirrors */
 475
 476         /* guess the actual size of one "memory mirror" - the number of
 477          * bytes between copies of the shared memory.  On most cards, it's
 478          * 2k (or there are no mirrors at all) but on some, it's 4k.
 479          */
 480         mirror_size = MIRROR_SIZE;
 481         if (readb(p) == TESTvalue &&
 482             check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
 483             check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
 484                 mirror_size = 2 * MIRROR_SIZE;
 485
 486         first_mirror = shmem - mirror_size;
 487         while (check_mirror(first_mirror, mirror_size) == 1)
 488                 first_mirror -= mirror_size;
 489         first_mirror += mirror_size;
 490
 491         last_mirror = shmem + mirror_size;
 492         while (check_mirror(last_mirror, mirror_size) == 1)
 493                 last_mirror += mirror_size;
 494         last_mirror -= mirror_size;
 495
 496         dev->mem_start = first_mirror;
 497         dev->mem_end = last_mirror + MIRROR_SIZE - 1;
 498
 499         iounmap(p);
 500         release_mem_region(shmem, MIRROR_SIZE);
 501
 502         if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
 503                 goto err_free_dev;
 504
 505         /* reserve the irq */
 506         if (request_irq(airq, arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
 507                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", airq);
 508                 goto err_release_mem;
 509         }
 510         dev->irq = airq;
 511
 512         /* Initialize the rest of the device structure. */
 513         lp->card_name = "COM90xx";
 514         lp->hw.command = com90xx_command;
 515         lp->hw.status = com90xx_status;
 516         lp->hw.intmask = com90xx_setmask;
 517         lp->hw.reset = com90xx_reset;
 518         lp->hw.owner = THIS_MODULE;
 519         lp->hw.copy_to_card = com90xx_copy_to_card;
 520         lp->hw.copy_from_card = com90xx_copy_from_card;
 521         lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 522         if (!lp->mem_start) {
 523                 BUGMSG(D_NORMAL, "Can't remap device memory!\n");
 524                 goto err_free_irq;
 525         }
 526
 527         /* get and check the station ID from offset 1 in shmem */
 528         dev->dev_addr[0] = readb(lp->mem_start + 1);
 529
 530         dev->base_addr = ioaddr;
 531
 532         BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
 533                "ShMem %lXh (%ld*%xh).\n",
 534                dev->dev_addr[0],
 535                dev->base_addr, dev->irq, dev->mem_start,
 536          (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
 537
 538         if (register_netdev(dev))
 539                 goto err_unmap;
 540
 541         cards[numcards++] = dev;
 542         return 0;
 543
 544 err_unmap:
 545         iounmap(lp->mem_start);
 546 err_free_irq:
 547         free_irq(dev->irq, dev);
 548 err_release_mem:
 549         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 550 err_free_dev:
 551         free_netdev(dev);
 552         return -EIO;
 553 }
 554
 555
 556 static void com90xx_command(struct net_device *dev, int cmd)
 557 {
 558         short ioaddr = dev->base_addr;
 559
 560         ACOMMAND(cmd);
 561 }
 562
 563
 564 static int com90xx_status(struct net_device *dev)
 565 {
 566         short ioaddr = dev->base_addr;
 567
 568         return ASTATUS();
 569 }
 570
 571
 572 static void com90xx_setmask(struct net_device *dev, int mask)
 573 {
 574         short ioaddr = dev->base_addr;
 575
 576         AINTMASK(mask);
 577 }
 578
 579
 580 /*
 581  * Do a hardware reset on the card, and set up necessary registers.
 582  *
 583  * This should be called as little as possible, because it disrupts the
 584  * token on the network (causes a RECON) and requires a significant delay.
 585  *
 586  * However, it does make sure the card is in a defined state.
 587  */
 588 static int com90xx_reset(struct net_device *dev, int really_reset)
 589 {
 590         struct arcnet_local *lp = netdev_priv(dev);
 591         short ioaddr = dev->base_addr;
 592
 593         BUGMSG(D_INIT, "Resetting (status=%02Xh)\n", ASTATUS());
 594
 595         if (really_reset) {
 596                 /* reset the card */
 597                 inb(_RESET);
 598                 mdelay(RESETtime);
 599         }
 600         ACOMMAND(CFLAGScmd | RESETclear);       /* clear flags & end reset */
 601         ACOMMAND(CFLAGScmd | CONFIGclear);
 602
 603         /* don't do this until we verify that it doesn't hurt older cards! */
 604         /* outb(inb(_CONFIG) | ENABLE16flag, _CONFIG); */
 605
 606         /* verify that the ARCnet signature byte is present */
 607         if (readb(lp->mem_start) != TESTvalue) {
 608                 if (really_reset)
 609                         BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 610                 return 1;
 611         }
 612         /* enable extended (512-byte) packets */
 613         ACOMMAND(CONFIGcmd | EXTconf);
 614
 615         /* clean out all the memory to make debugging make more sense :) */
 616         BUGLVL(D_DURING)
 617             memset_io(lp->mem_start, 0x42, 2048);
 618
 619         /* done!  return success. */
 620         return 0;
 621 }
 622
 623 static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
 624                                  void *buf, int count)
 625 {
 626         struct arcnet_local *lp = netdev_priv(dev);
 627         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 628         TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 629 }
 630
 631
 632 static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
 633                                    void *buf, int count)
 634 {
 635         struct arcnet_local *lp = netdev_priv(dev);
 636         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 637         TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 638 }
 639
 640
 641 MODULE_LICENSE("GPL");
 642
 643 static int __init com90xx_init(void)
 644 {
 645         if (irq == 2)
 646                 irq = 9;
 647         com90xx_probe();
 648         if (!numcards)
 649                 return -EIO;
 650         return 0;
 651 }
 652
 653 static void __exit com90xx_exit(void)
 654 {
 655         struct net_device *dev;
 656         struct arcnet_local *lp;
 657         int count;
 658
 659         for (count = 0; count < numcards; count++) {
 660                 dev = cards[count];
 661                 lp = netdev_priv(dev);
 662
 663                 unregister_netdev(dev);
 664                 free_irq(dev->irq, dev);
 665                 iounmap(lp->mem_start);
 666                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 667                 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 668                 free_netdev(dev);
 669         }
 670 }
 671
 672 module_init(com90xx_init);
 673 module_exit(com90xx_exit);
 674
 675 #ifndef MODULE
 676 static int __init com90xx_setup(char *s)
 677 {
 678         int ints[8];
 679
 680         s = get_options(s, 8, ints);
 681         if (!ints[0] && !*s) {
 682                 printk("com90xx: Disabled.\n");
 683                 return 1;
 684         }
 685
 686         switch (ints[0]) {
 687         default:                /* ERROR */
 688                 printk("com90xx: Too many arguments.\n");
 689         case 3:         /* Mem address */
 690                 shmem = ints[3];
 691         case 2:         /* IRQ */
 692                 irq = ints[2];
 693         case 1:         /* IO address */
 694                 io = ints[1];
 695         }
 696
 697         if (*s)
 698                 snprintf(device, sizeof(device), "%s", s);
 699
 700         return 1;
 701 }
 702
 703 __setup("com90xx=", com90xx_setup);
 704 #endif