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
  28 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
  29
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/init.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/ioport.h>
  35 #include <linux/delay.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/slab.h>
  38 #include <linux/io.h>
  39
  40 #include "arcdevice.h"
  41 #include "com9026.h"
  42
  43 /* Define this to speed up the autoprobe by assuming if only one io port and
  44  * shmem are left in the list at Stage 5, they must correspond to each
  45  * other.
  46  *
  47  * This is undefined by default because it might not always be true, and the
  48  * extra check makes the autoprobe even more careful.  Speed demons can turn
  49  * it on - I think it should be fine if you only have one ARCnet card
  50  * installed.
  51  *
  52  * If no ARCnet cards are installed, this delay never happens anyway and thus
  53  * the option has no effect.
  54  */
  55 #undef FAST_PROBE
  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,
  66                                    int offset, 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 static int com90xx_skip_probe __initdata = 0;
  83
  84 /* Module parameters */
  85
  86 static int io;                  /* use the insmod io= irq= shmem= options */
  87 static int irq;
  88 static int shmem;
  89 static char device[9];          /* use eg. device=arc1 to change name */
  90
  91 module_param(io, int, 0);
  92 module_param(irq, int, 0);
  93 module_param(shmem, int, 0);
  94 module_param_string(device, device, sizeof(device), 0);
  95
  96 static void __init com90xx_probe(void)
  97 {
  98         int count, status, ioaddr, numprint, airq, openparen = 0;
  99         unsigned long airqmask;
 100         int ports[(0x3f0 - 0x200) / 16 + 1] = { 0 };
 101         unsigned long *shmems;
 102         void __iomem **iomem;
 103         int numports, numshmems, *port;
 104         u_long *p;
 105         int index;
 106
 107         if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
 108                 return;
 109
 110         shmems = kzalloc(((0x100000 - 0xa0000) / 0x800) * sizeof(unsigned long),
 111                          GFP_KERNEL);
 112         if (!shmems)
 113                 return;
 114         iomem = kzalloc(((0x100000 - 0xa0000) / 0x800) * sizeof(void __iomem *),
 115                         GFP_KERNEL);
 116         if (!iomem) {
 117                 kfree(shmems);
 118                 return;
 119         }
 120
 121         if (BUGLVL(D_NORMAL))
 122                 pr_info("%s\n", "COM90xx chipset support");
 123
 124         /* set up the arrays where we'll store the possible probe addresses */
 125         numports = numshmems = 0;
 126         if (io)
 127                 ports[numports++] = io;
 128         else
 129                 for (count = 0x200; count <= 0x3f0; count += 16)
 130                         ports[numports++] = count;
 131         if (shmem)
 132                 shmems[numshmems++] = shmem;
 133         else
 134                 for (count = 0xA0000; count <= 0xFF800; count += 2048)
 135                         shmems[numshmems++] = count;
 136
 137         /* Stage 1: abandon any reserved ports, or ones with status==0xFF
 138          * (empty), and reset any others by reading the reset port.
 139          */
 140         numprint = -1;
 141         for (port = &ports[0]; port - ports < numports; port++) {
 142                 numprint++;
 143                 numprint %= 8;
 144                 if (!numprint) {
 145                         arc_cont(D_INIT, "\n");
 146                         arc_cont(D_INIT, "S1: ");
 147                 }
 148                 arc_cont(D_INIT, "%Xh ", *port);
 149
 150                 ioaddr = *port;
 151
 152                 if (!request_region(*port, ARCNET_TOTAL_SIZE,
 153                                     "arcnet (90xx)")) {
 154                         arc_cont(D_INIT_REASONS, "(request_region)\n");
 155                         arc_cont(D_INIT_REASONS, "S1: ");
 156                         if (BUGLVL(D_INIT_REASONS))
 157                                 numprint = 0;
 158                         *port-- = ports[--numports];
 159                         continue;
 160                 }
 161                 if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) {
 162                         arc_cont(D_INIT_REASONS, "(empty)\n");
 163                         arc_cont(D_INIT_REASONS, "S1: ");
 164                         if (BUGLVL(D_INIT_REASONS))
 165                                 numprint = 0;
 166                         release_region(*port, ARCNET_TOTAL_SIZE);
 167                         *port-- = ports[--numports];
 168                         continue;
 169                 }
 170                 /* begin resetting card */
 171                 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 172
 173                 arc_cont(D_INIT_REASONS, "\n");
 174                 arc_cont(D_INIT_REASONS, "S1: ");
 175                 if (BUGLVL(D_INIT_REASONS))
 176                         numprint = 0;
 177         }
 178         arc_cont(D_INIT, "\n");
 179
 180         if (!numports) {
 181                 arc_cont(D_NORMAL, "S1: No ARCnet cards found.\n");
 182                 kfree(shmems);
 183                 kfree(iomem);
 184                 return;
 185         }
 186         /* Stage 2: we have now reset any possible ARCnet cards, so we can't
 187          * do anything until they finish.  If D_INIT, print the list of
 188          * cards that are left.
 189          */
 190         numprint = -1;
 191         for (port = &ports[0]; port < ports + numports; port++) {
 192                 numprint++;
 193                 numprint %= 8;
 194                 if (!numprint) {
 195                         arc_cont(D_INIT, "\n");
 196                         arc_cont(D_INIT, "S2: ");
 197                 }
 198                 arc_cont(D_INIT, "%Xh ", *port);
 199         }
 200         arc_cont(D_INIT, "\n");
 201         mdelay(RESETtime);
 202
 203         /* Stage 3: abandon any shmem addresses that don't have the signature
 204          * 0xD1 byte in the right place, or are read-only.
 205          */
 206         numprint = -1;
 207         for (index = 0, p = &shmems[0]; index < numshmems; p++, index++) {
 208                 void __iomem *base;
 209
 210                 numprint++;
 211                 numprint %= 8;
 212                 if (!numprint) {
 213                         arc_cont(D_INIT, "\n");
 214                         arc_cont(D_INIT, "S3: ");
 215                 }
 216                 arc_cont(D_INIT, "%lXh ", *p);
 217
 218                 if (!request_mem_region(*p, MIRROR_SIZE, "arcnet (90xx)")) {
 219                         arc_cont(D_INIT_REASONS, "(request_mem_region)\n");
 220                         arc_cont(D_INIT_REASONS, "Stage 3: ");
 221                         if (BUGLVL(D_INIT_REASONS))
 222                                 numprint = 0;
 223                         goto out;
 224                 }
 225                 base = ioremap(*p, MIRROR_SIZE);
 226                 if (!base) {
 227                         arc_cont(D_INIT_REASONS, "(ioremap)\n");
 228                         arc_cont(D_INIT_REASONS, "Stage 3: ");
 229                         if (BUGLVL(D_INIT_REASONS))
 230                                 numprint = 0;
 231                         goto out1;
 232                 }
 233                 if (arcnet_readb(base, COM9026_REG_R_STATUS) != TESTvalue) {
 234                         arc_cont(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
 235                                  arcnet_readb(base, COM9026_REG_R_STATUS),
 236                                  TESTvalue);
 237                         arc_cont(D_INIT_REASONS, "S3: ");
 238                         if (BUGLVL(D_INIT_REASONS))
 239                                 numprint = 0;
 240                         goto out2;
 241                 }
 242                 /* By writing 0x42 to the TESTvalue location, we also make
 243                  * sure no "mirror" shmem areas show up - if they occur
 244                  * in another pass through this loop, they will be discarded
 245                  * because *cptr != TESTvalue.
 246                  */
 247                 arcnet_writeb(0x42, base, COM9026_REG_W_INTMASK);
 248                 if (arcnet_readb(base, COM9026_REG_R_STATUS) != 0x42) {
 249                         arc_cont(D_INIT_REASONS, "(read only)\n");
 250                         arc_cont(D_INIT_REASONS, "S3: ");
 251                         goto out2;
 252                 }
 253                 arc_cont(D_INIT_REASONS, "\n");
 254                 arc_cont(D_INIT_REASONS, "S3: ");
 255                 if (BUGLVL(D_INIT_REASONS))
 256                         numprint = 0;
 257                 iomem[index] = base;
 258                 continue;
 259         out2:
 260                 iounmap(base);
 261         out1:
 262                 release_mem_region(*p, MIRROR_SIZE);
 263         out:
 264                 *p-- = shmems[--numshmems];
 265                 index--;
 266         }
 267         arc_cont(D_INIT, "\n");
 268
 269         if (!numshmems) {
 270                 arc_cont(D_NORMAL, "S3: No ARCnet cards found.\n");
 271                 for (port = &ports[0]; port < ports + numports; port++)
 272                         release_region(*port, ARCNET_TOTAL_SIZE);
 273                 kfree(shmems);
 274                 kfree(iomem);
 275                 return;
 276         }
 277         /* Stage 4: something of a dummy, to report the shmems that are
 278          * still possible after stage 3.
 279          */
 280         numprint = -1;
 281         for (p = &shmems[0]; p < shmems + numshmems; p++) {
 282                 numprint++;
 283                 numprint %= 8;
 284                 if (!numprint) {
 285                         arc_cont(D_INIT, "\n");
 286                         arc_cont(D_INIT, "S4: ");
 287                 }
 288                 arc_cont(D_INIT, "%lXh ", *p);
 289         }
 290         arc_cont(D_INIT, "\n");
 291
 292         /* Stage 5: for any ports that have the correct status, can disable
 293          * the RESET flag, and (if no irq is given) generate an autoirq,
 294          * register an ARCnet device.
 295          *
 296          * Currently, we can only register one device per probe, so quit
 297          * after the first one is found.
 298          */
 299         numprint = -1;
 300         for (port = &ports[0]; port < ports + numports; port++) {
 301                 int found = 0;
 302
 303                 numprint++;
 304                 numprint %= 8;
 305                 if (!numprint) {
 306                         arc_cont(D_INIT, "\n");
 307                         arc_cont(D_INIT, "S5: ");
 308                 }
 309                 arc_cont(D_INIT, "%Xh ", *port);
 310
 311                 ioaddr = *port;
 312                 status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 313
 314                 if ((status & 0x9D)
 315                     != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 316                         arc_cont(D_INIT_REASONS, "(status=%Xh)\n", status);
 317                         arc_cont(D_INIT_REASONS, "S5: ");
 318                         if (BUGLVL(D_INIT_REASONS))
 319                                 numprint = 0;
 320                         release_region(*port, ARCNET_TOTAL_SIZE);
 321                         *port-- = ports[--numports];
 322                         continue;
 323                 }
 324                 arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 325                             ioaddr, COM9026_REG_W_COMMAND);
 326                 status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 327                 if (status & RESETflag) {
 328                         arc_cont(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
 329                                  status);
 330                         arc_cont(D_INIT_REASONS, "S5: ");
 331                         if (BUGLVL(D_INIT_REASONS))
 332                                 numprint = 0;
 333                         release_region(*port, ARCNET_TOTAL_SIZE);
 334                         *port-- = ports[--numports];
 335                         continue;
 336                 }
 337                 /* skip this completely if an IRQ was given, because maybe
 338                  * we're on a machine that locks during autoirq!
 339                  */
 340                 if (!irq) {
 341                         /* if we do this, we're sure to get an IRQ since the
 342                          * card has just reset and the NORXflag is on until
 343                          * we tell it to start receiving.
 344                          */
 345                         airqmask = probe_irq_on();
 346                         arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK);
 347                         udelay(1);
 348                         arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK);
 349                         airq = probe_irq_off(airqmask);
 350
 351                         if (airq <= 0) {
 352                                 arc_cont(D_INIT_REASONS, "(airq=%d)\n", airq);
 353                                 arc_cont(D_INIT_REASONS, "S5: ");
 354                                 if (BUGLVL(D_INIT_REASONS))
 355                                         numprint = 0;
 356                                 release_region(*port, ARCNET_TOTAL_SIZE);
 357                                 *port-- = ports[--numports];
 358                                 continue;
 359                         }
 360                 } else {
 361                         airq = irq;
 362                 }
 363
 364                 arc_cont(D_INIT, "(%d,", airq);
 365                 openparen = 1;
 366
 367                 /* Everything seems okay.  But which shmem, if any, puts
 368                  * back its signature byte when the card is reset?
 369                  *
 370                  * If there are multiple cards installed, there might be
 371                  * multiple shmems still in the list.
 372                  */
 373 #ifdef FAST_PROBE
 374                 if (numports > 1 || numshmems > 1) {
 375                         arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 376                         mdelay(RESETtime);
 377                 } else {
 378                         /* just one shmem and port, assume they match */
 379                         arcnet_writeb(TESTvalue, iomem[0],
 380                                       COM9026_REG_W_INTMASK);
 381                 }
 382 #else
 383                 arcnet_inb(ioaddr, COM9026_REG_R_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 (arcnet_readb(base, COM9026_REG_R_STATUS) == TESTvalue) {    /* found one */
 392                                 arc_cont(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                                 arc_cont(D_INIT_REASONS, "%Xh-",
 406                                          arcnet_readb(base, COM9026_REG_R_STATUS));
 407                         }
 408                 }
 409
 410                 if (openparen) {
 411                         if (BUGLVL(D_INIT))
 412                                 pr_cont("no matching shmem)\n");
 413                         if (BUGLVL(D_INIT_REASONS)) {
 414                                 pr_cont("S5: ");
 415                                 numprint = 0;
 416                         }
 417                 }
 418                 if (!found)
 419                         release_region(*port, ARCNET_TOTAL_SIZE);
 420                 *port-- = ports[--numports];
 421         }
 422
 423         if (BUGLVL(D_INIT_REASONS))
 424                 pr_cont("\n");
 425
 426         /* Now put back TESTvalue on all leftover shmems. */
 427         for (index = 0; index < numshmems; index++) {
 428                 arcnet_writeb(TESTvalue, iomem[index], COM9026_REG_W_INTMASK);
 429                 iounmap(iomem[index]);
 430                 release_mem_region(shmems[index], MIRROR_SIZE);
 431         }
 432         kfree(shmems);
 433         kfree(iomem);
 434 }
 435
 436 static int __init check_mirror(unsigned long addr, size_t size)
 437 {
 438         void __iomem *p;
 439         int res = -1;
 440
 441         if (!request_mem_region(addr, size, "arcnet (90xx)"))
 442                 return -1;
 443
 444         p = ioremap(addr, size);
 445         if (p) {
 446                 if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue)
 447                         res = 1;
 448                 else
 449                         res = 0;
 450                 iounmap(p);
 451         }
 452
 453         release_mem_region(addr, size);
 454         return res;
 455 }
 456
 457 /* Set up the struct net_device associated with this card.  Called after
 458  * probing succeeds.
 459  */
 460 static int __init com90xx_found(int ioaddr, int airq, u_long shmem,
 461                                 void __iomem *p)
 462 {
 463         struct net_device *dev = NULL;
 464         struct arcnet_local *lp;
 465         u_long first_mirror, last_mirror;
 466         int mirror_size;
 467
 468         /* allocate struct net_device */
 469         dev = alloc_arcdev(device);
 470         if (!dev) {
 471                 arc_cont(D_NORMAL, "com90xx: Can't allocate device!\n");
 472                 iounmap(p);
 473                 release_mem_region(shmem, MIRROR_SIZE);
 474                 return -ENOMEM;
 475         }
 476         lp = netdev_priv(dev);
 477         /* find the real shared memory start/end points, including mirrors */
 478
 479         /* guess the actual size of one "memory mirror" - the number of
 480          * bytes between copies of the shared memory.  On most cards, it's
 481          * 2k (or there are no mirrors at all) but on some, it's 4k.
 482          */
 483         mirror_size = MIRROR_SIZE;
 484         if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
 485             check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
 486             check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
 487                 mirror_size = 2 * MIRROR_SIZE;
 488
 489         first_mirror = shmem - mirror_size;
 490         while (check_mirror(first_mirror, mirror_size) == 1)
 491                 first_mirror -= mirror_size;
 492         first_mirror += mirror_size;
 493
 494         last_mirror = shmem + mirror_size;
 495         while (check_mirror(last_mirror, mirror_size) == 1)
 496                 last_mirror += mirror_size;
 497         last_mirror -= mirror_size;
 498
 499         dev->mem_start = first_mirror;
 500         dev->mem_end = last_mirror + MIRROR_SIZE - 1;
 501
 502         iounmap(p);
 503         release_mem_region(shmem, MIRROR_SIZE);
 504
 505         if (!request_mem_region(dev->mem_start,
 506                                 dev->mem_end - dev->mem_start + 1,
 507                                 "arcnet (90xx)"))
 508                 goto err_free_dev;
 509
 510         /* reserve the irq */
 511         if (request_irq(airq, arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
 512                 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", airq);
 513                 goto err_release_mem;
 514         }
 515         dev->irq = airq;
 516
 517         /* Initialize the rest of the device structure. */
 518         lp->card_name = "COM90xx";
 519         lp->hw.command = com90xx_command;
 520         lp->hw.status = com90xx_status;
 521         lp->hw.intmask = com90xx_setmask;
 522         lp->hw.reset = com90xx_reset;
 523         lp->hw.owner = THIS_MODULE;
 524         lp->hw.copy_to_card = com90xx_copy_to_card;
 525         lp->hw.copy_from_card = com90xx_copy_from_card;
 526         lp->mem_start = ioremap(dev->mem_start,
 527                                 dev->mem_end - dev->mem_start + 1);
 528         if (!lp->mem_start) {
 529                 arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
 530                 goto err_free_irq;
 531         }
 532
 533         /* get and check the station ID from offset 1 in shmem */
 534         dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);
 535
 536         dev->base_addr = ioaddr;
 537
 538         arc_printk(D_NORMAL, dev, "COM90xx station %02Xh found at %03lXh, IRQ %d, ShMem %lXh (%ld*%xh).\n",
 539                    dev->dev_addr[0],
 540                    dev->base_addr, dev->irq, dev->mem_start,
 541                    (dev->mem_end - dev->mem_start + 1) / mirror_size,
 542                    mirror_size);
 543
 544         if (register_netdev(dev))
 545                 goto err_unmap;
 546
 547         cards[numcards++] = dev;
 548         return 0;
 549
 550 err_unmap:
 551         iounmap(lp->mem_start);
 552 err_free_irq:
 553         free_irq(dev->irq, dev);
 554 err_release_mem:
 555         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 556 err_free_dev:
 557         free_netdev(dev);
 558         return -EIO;
 559 }
 560
 561 static void com90xx_command(struct net_device *dev, int cmd)
 562 {
 563         short ioaddr = dev->base_addr;
 564
 565         arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND);
 566 }
 567
 568 static int com90xx_status(struct net_device *dev)
 569 {
 570         short ioaddr = dev->base_addr;
 571
 572         return arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 573 }
 574
 575 static void com90xx_setmask(struct net_device *dev, int mask)
 576 {
 577         short ioaddr = dev->base_addr;
 578
 579         arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK);
 580 }
 581
 582 /* Do a hardware reset on the card, and set up necessary registers.
 583  *
 584  * This should be called as little as possible, because it disrupts the
 585  * token on the network (causes a RECON) and requires a significant delay.
 586  *
 587  * However, it does make sure the card is in a defined state.
 588  */
 589 static int com90xx_reset(struct net_device *dev, int really_reset)
 590 {
 591         struct arcnet_local *lp = netdev_priv(dev);
 592         short ioaddr = dev->base_addr;
 593
 594         arc_printk(D_INIT, dev, "Resetting (status=%02Xh)\n",
 595                    arcnet_inb(ioaddr, COM9026_REG_R_STATUS));
 596
 597         if (really_reset) {
 598                 /* reset the card */
 599                 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 600                 mdelay(RESETtime);
 601         }
 602         /* clear flags & end reset */
 603         arcnet_outb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
 604         arcnet_outb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);
 605
 606 #if 0
 607         /* don't do this until we verify that it doesn't hurt older cards! */
 608         arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) | ENABLE16flag,
 609                     ioaddr, COM9026_REG_RW_CONFIG);
 610 #endif
 611
 612         /* verify that the ARCnet signature byte is present */
 613         if (arcnet_readb(lp->mem_start, COM9026_REG_R_STATUS) != TESTvalue) {
 614                 if (really_reset)
 615                         arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
 616                 return 1;
 617         }
 618         /* enable extended (512-byte) packets */
 619         arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);
 620
 621         /* clean out all the memory to make debugging make more sense :) */
 622         if (BUGLVL(D_DURING))
 623                 memset_io(lp->mem_start, 0x42, 2048);
 624
 625         /* done!  return success. */
 626         return 0;
 627 }
 628
 629 static void com90xx_copy_to_card(struct net_device *dev, int bufnum,
 630                                  int offset, void *buf, int count)
 631 {
 632         struct arcnet_local *lp = netdev_priv(dev);
 633         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 634
 635         TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 636 }
 637
 638 static void com90xx_copy_from_card(struct net_device *dev, int bufnum,
 639                                    int offset, void *buf, int count)
 640 {
 641         struct arcnet_local *lp = netdev_priv(dev);
 642         void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
 643
 644         TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 645 }
 646
 647 MODULE_LICENSE("GPL");
 648
 649 static int __init com90xx_init(void)
 650 {
 651         if (irq == 2)
 652                 irq = 9;
 653         com90xx_probe();
 654         if (!numcards)
 655                 return -EIO;
 656         return 0;
 657 }
 658
 659 static void __exit com90xx_exit(void)
 660 {
 661         struct net_device *dev;
 662         struct arcnet_local *lp;
 663         int count;
 664
 665         for (count = 0; count < numcards; count++) {
 666                 dev = cards[count];
 667                 lp = netdev_priv(dev);
 668
 669                 unregister_netdev(dev);
 670                 free_irq(dev->irq, dev);
 671                 iounmap(lp->mem_start);
 672                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 673                 release_mem_region(dev->mem_start,
 674                                    dev->mem_end - dev->mem_start + 1);
 675                 free_netdev(dev);
 676         }
 677 }
 678
 679 module_init(com90xx_init);
 680 module_exit(com90xx_exit);
 681
 682 #ifndef MODULE
 683 static int __init com90xx_setup(char *s)
 684 {
 685         int ints[8];
 686
 687         s = get_options(s, 8, ints);
 688         if (!ints[0] && !*s) {
 689                 pr_notice("Disabled\n");
 690                 return 1;
 691         }
 692
 693         switch (ints[0]) {
 694         default:                /* ERROR */
 695                 pr_err("Too many arguments\n");
 696         case 3:         /* Mem address */
 697                 shmem = ints[3];
 698         case 2:         /* IRQ */
 699                 irq = ints[2];
 700         case 1:         /* IO address */
 701                 io = ints[1];
 702         }
 703
 704         if (*s)
 705                 snprintf(device, sizeof(device), "%s", s);
 706
 707         return 1;
 708 }
 709
 710 __setup("com90xx=", com90xx_setup);
 711 #endif