i386/linux/linux-2.3.21/drivers/net/com90io.c

   1 /*      $Id: com90io.c,v 1.6 1997/11/09 11:04:59 mj Exp $
   2
   3         Written 1997 by David Woodhouse <dwmw2@cam.ac.uk>
   4
   5         Derived from the original arcnet.c,
   6         Written 1994-1996 by Avery Pennarun,
   7         which was in turn derived from skeleton.c by Donald Becker.
   8
   9         **********************
  10
  11         The original copyright of skeleton.c was as follows:
  12
  13         skeleton.c Written 1993 by Donald Becker.
  14         Copyright 1993 United States Government as represented by the
  15         Director, National Security Agency.  This software may only be used
  16         and distributed according to the terms of the GNU Public License as
  17         modified by SRC, incorporated herein by reference.
  18
  19         **********************
  20
  21         For more details, see drivers/net/arcnet.c
  22
  23         **********************
  24 */
  25
  26
  27 #include <linux/module.h>
  28 #include <linux/version.h>
  29
  30 #include <linux/kernel.h>
  31 #include <linux/sched.h>
  32 #include <linux/types.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/ioport.h>
  37 #include <linux/in.h>
  38 #include <linux/malloc.h>
  39 #include <linux/string.h>
  40 #include <linux/timer.h>
  41 #include <linux/errno.h>
  42 #include <linux/delay.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/init.h>
  48 #include <linux/if_arcnet.h>
  49 #include <linux/arcdevice.h>
  50
  51 #include <asm/system.h>
  52 #include <asm/bitops.h>
  53 #include <asm/io.h>
  54 #include <asm/dma.h>
  55
  56 #include <net/arp.h>
  57
  58
  59 /* Internal function declarations */
  60
  61 static int arc90io_probe(struct net_device *dev);
  62 static void arc90io_rx(struct net_device *dev,int recbuf);
  63 static int arc90io_found(struct net_device *dev,int ioaddr,int airq);
  64 static void arc90io_inthandler (struct net_device *dev);
  65 static int arc90io_reset (struct net_device *dev, int reset_delay);
  66 static void arc90io_setmask (struct net_device *dev, u_char mask);
  67 static void arc90io_command (struct net_device *dev, u_char command);
  68 static u_char arc90io_status (struct net_device *dev);
  69 static void arc90io_prepare_tx(struct net_device *dev,u_char *hdr,int hdrlen,
  70                       char *data,int length,int daddr,int exceptA, int offset);
  71 static  void arc90io_openclose(int open);
  72
  73 static u_char get_buffer_byte (struct net_device *dev, unsigned offset);
  74 static void put_buffer_byte (struct net_device *dev, unsigned offset, u_char datum);
  75 static void get_whole_buffer (struct net_device *dev, unsigned offset, unsigned length, char *dest);
  76 static void put_whole_buffer (struct net_device *dev, unsigned offset, unsigned length, char *dest);
  77
  78
  79 /* Module parameters */
  80
  81 #ifdef MODULE
  82 static int io=0x0;      /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
  83 static int irq=0;       /* or use the insmod io= irq= shmem= options */
  84 static char *device;    /* use eg. device="arc1" to change name */
  85
  86 MODULE_PARM(io, "i");
  87 MODULE_PARM(irq, "i");
  88 MODULE_PARM(device, "s");
  89 #else
  90 void __init com90io_setup (char *str, int *ints);
  91 extern struct net_device arcnet_devs[];
  92 extern char arcnet_dev_names[][10];
  93 extern int arcnet_num_devs;
  94 #endif
  95
  96
  97 /* Handy defines for ARCnet specific stuff */
  98
  99 /* The number of low I/O ports used by the card. */
 100 #define ARCNET_TOTAL_SIZE 16
 101
 102 /* COM 9026 controller chip --> ARCnet register addresses */
 103 #define _INTMASK (ioaddr+0)     /* writable */
 104 #define _STATUS  (ioaddr+0)     /* readable */
 105 #define _COMMAND (ioaddr+1)     /* writable, returns random vals on read (?) */
 106 #define _RESET  (ioaddr+8)      /* software reset (on read) */
 107 #define _MEMDATA  (ioaddr+12)            /* Data port for IO-mapped memory */
 108 #define _ADDR_HI  (ioaddr+15)            /* Control registers for said */
 109 #define _ADDR_LO  (ioaddr+14)
 110 #define _CONFIG  (ioaddr+2)      /* Configuration register */
 111
 112 #define ARCSTATUS       inb(_STATUS)
 113 #define ACOMMAND(cmd) outb((cmd),_COMMAND)
 114 #define AINTMASK(msk)   outb((msk),_INTMASK)
 115
 116 #define ARCRESET        inb(_RESET)
 117
 118 #define SETCONF         outb((lp->config),_CONFIG)
 119
 120
 121 /****************************************************************************
 122  *                                                                          *
 123  * IO-mapped operation routines                                             *
 124  *                                                                          *
 125  ****************************************************************************/
 126
 127 u_char get_buffer_byte (struct net_device *dev, unsigned offset)
 128 {
 129   int ioaddr=dev->base_addr;
 130
 131   outb(offset >> 8,  _ADDR_HI);
 132   outb(offset & 0xff, _ADDR_LO);
 133
 134   return inb(_MEMDATA);
 135 }
 136
 137 void put_buffer_byte (struct net_device *dev, unsigned offset, u_char datum)
 138 {
 139   int ioaddr=dev->base_addr;
 140
 141   outb(offset >> 8,   _ADDR_HI);
 142   outb(offset & 0xff, _ADDR_LO);
 143
 144   outb(datum, _MEMDATA);
 145 }
 146
 147
 148 #undef ONE_AT_A_TIME_TX
 149 #undef ONE_AT_A_TIME_RX
 150
 151 void get_whole_buffer (struct net_device *dev, unsigned offset, unsigned length, char *dest)
 152 {
 153   int ioaddr=dev->base_addr;
 154
 155   outb( (offset >> 8) | AUTOINCflag,   _ADDR_HI);
 156   outb( offset & 0xff,                 _ADDR_LO);
 157
 158   while (length--)
 159 #ifdef ONE_AT_A_TIME_RX
 160     *(dest++) = get_buffer_byte(dev,offset++);
 161 #else
 162     *(dest++) = inb (_MEMDATA);
 163 #endif
 164 }
 165
 166 void put_whole_buffer (struct net_device *dev, unsigned offset, unsigned length, char *dest)
 167 {
 168   int ioaddr=dev->base_addr;
 169
 170   outb( (offset >> 8) | AUTOINCflag,   _ADDR_HI);
 171   outb( offset & 0xff,                 _ADDR_LO);
 172
 173   while (length--)
 174 #ifdef ONE_AT_A_TIME_TX
 175     put_buffer_byte(dev,offset++,*(dest++));
 176 #else
 177     outb (*(dest++), _MEMDATA);
 178 #endif
 179 }
 180
 181
 182 static const char *version =
 183  "com90io.c: v3.00 97/11/09 Avery Pennarun <apenwarr@worldvisions.ca> et al.\n";
 184
 185
 186 /****************************************************************************
 187  *                                                                          *
 188  * Probe and initialization                                                 *
 189  *                                                                          *
 190  ****************************************************************************/
 191
 192 /* We cannot probe for an IO mapped card either, although we can check that
 193  * it's where we were told it was, and even autoirq
 194  */
 195
 196 int __init arc90io_probe(struct net_device *dev)
 197 {
 198   int ioaddr=dev->base_addr,status,delayval;
 199   unsigned long airqmask;
 200
 201   BUGLVL(D_NORMAL) printk(version);
 202
 203   if (ioaddr<0x200)
 204     {
 205       BUGMSG(D_NORMAL,"No autoprobe for IO mapped cards; you "
 206              "must specify the base address!\n");
 207       return -ENODEV;
 208     }
 209
 210   if (check_region(ioaddr, ARCNET_TOTAL_SIZE))
 211     {
 212       BUGMSG(D_INIT_REASONS,"IO check_region %x-%x failed.\n",
 213              ioaddr,ioaddr+ARCNET_TOTAL_SIZE-1);
 214       return -ENXIO;
 215     }
 216
 217   if (ARCSTATUS == 0xFF)
 218     {
 219       BUGMSG(D_INIT_REASONS,"IO address %x empty\n",ioaddr);
 220       return -ENODEV;
 221     }
 222
 223   ARCRESET;
 224   JIFFER(RESETtime);
 225
 226   status=ARCSTATUS;
 227
 228   if ((status & 0x9D)
 229       !=  (NORXflag|RECONflag|TXFREEflag|RESETflag))
 230     {
 231       BUGMSG(D_INIT_REASONS,"Status invalid (%Xh).\n",status);
 232       return -ENODEV;
 233     }
 234
 235   BUGMSG(D_INIT_REASONS,"Status after reset: %X\n",status);
 236
 237   ACOMMAND(CFLAGScmd|RESETclear|CONFIGclear);
 238
 239   BUGMSG(D_INIT_REASONS,"Status after reset acknowledged: %X\n",status);
 240
 241   status=ARCSTATUS;
 242
 243   if (status & RESETflag)
 244     {
 245       BUGMSG(D_INIT_REASONS,"Eternal reset (status=%Xh)\n",status);
 246       return -ENODEV;
 247     }
 248
 249   outb((0x16 | IOMAPflag) &~ENABLE16flag, _CONFIG);
 250
 251   /* Read first loc'n of memory */
 252
 253   outb(AUTOINCflag ,_ADDR_HI);
 254   outb(0,_ADDR_LO);
 255
 256   if ((status=inb(_MEMDATA)) != 0xd1)
 257     {
 258       BUGMSG(D_INIT_REASONS,"Signature byte not found"
 259              " (%Xh instead).\n", status);
 260       return -ENODEV;
 261     }
 262
 263   if (!dev->irq)
 264     {
 265       /* if we do this, we're sure to get an IRQ since the
 266        * card has just reset and the NORXflag is on until
 267        * we tell it to start receiving.
 268        */
 269
 270       airqmask = probe_irq_on();
 271       outb(NORXflag,_INTMASK);
 272       udelay(1);
 273       outb(0,_INTMASK);
 274       dev->irq = probe_irq_off(airqmask);
 275
 276       if (dev->irq<=0)
 277         {
 278           BUGMSG(D_INIT_REASONS,"Autoprobe IRQ failed\n");
 279           return -ENODEV;
 280         }
 281     }
 282
 283   return arc90io_found(dev,dev->base_addr,dev->irq);
 284 }
 285
 286
 287 /* Set up the struct net_device associated with this card.  Called after
 288  * probing succeeds.
 289  */
 290 int __init arc90io_found(struct net_device *dev,int ioaddr,int airq)
 291 {
 292   struct arcnet_local *lp;
 293
 294   /* reserve the irq */
 295   if (request_irq(airq,&arcnet_interrupt,0,"arcnet (COM90xx-IO)",dev))
 296     {
 297       BUGMSG(D_NORMAL,"Can't get IRQ %d!\n",airq);
 298       return -ENODEV;
 299     }
 300   dev->irq=airq;
 301
 302   /* reserve the I/O region - guaranteed to work by check_region */
 303   request_region(ioaddr,ARCNET_TOTAL_SIZE,"arcnet (COM90xx-IO)");
 304   dev->base_addr=ioaddr;
 305
 306   dev->mem_start=dev->mem_end=dev->rmem_start=dev->rmem_end=(long)NULL;
 307
 308   /* Initialize the rest of the device structure. */
 309
 310   dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
 311   if (dev->priv == NULL)
 312     {
 313       free_irq(airq,dev);
 314       release_region(ioaddr,ARCNET_TOTAL_SIZE);
 315       return -ENOMEM;
 316     }
 317
 318   memset(dev->priv,0,sizeof(struct arcnet_local));
 319   lp=(struct arcnet_local *)(dev->priv);
 320   lp->card_type = ARC_90xx_IO;
 321   lp->card_type_str = "COM 90xx (IO)";
 322
 323   lp->arcnet_reset=arc90io_reset;
 324   lp->asetmask=arc90io_setmask;
 325   lp->astatus=arc90io_status;
 326   lp->acommand=arc90io_command;
 327   lp->openclose_device=arc90io_openclose;
 328   lp->prepare_tx=arc90io_prepare_tx;
 329   lp->inthandler=arc90io_inthandler;
 330
 331   /* Fill in the fields of the device structure with generic
 332    * values.
 333    */
 334   arcnet_setup(dev);
 335
 336   /* And now fill particular fields with arcnet values */
 337   dev->mtu=1500; /* completely arbitrary - agrees with ether, though */
 338   dev->hard_header_len=sizeof(struct ClientData);
 339   lp->sequence=1;
 340   lp->recbuf=0;
 341
 342   BUGMSG(D_DURING,"ClientData header size is %d.\n",
 343          sizeof(struct ClientData));
 344   BUGMSG(D_DURING,"HardHeader size is %d.\n",
 345          sizeof(struct archdr));
 346
 347   lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
 348   SETCONF;
 349
 350   /* get and check the station ID from offset 1 in shmem */
 351
 352   lp->stationid = get_buffer_byte(dev,1);
 353
 354   if (!lp->stationid)
 355     BUGMSG(D_NORMAL,"WARNING!  Station address 00 is reserved "
 356            "for broadcasts!\n");
 357   else if (lp->stationid==255)
 358     BUGMSG(D_NORMAL,"WARNING!  Station address FF may confuse "
 359            "DOS networking programs!\n");
 360   dev->dev_addr[0]=lp->stationid;
 361
 362   BUGMSG(D_NORMAL,"ARCnet COM90xx in IO-mapped mode:  "
 363          "station %02Xh found at %03lXh, IRQ %d.\n",
 364          lp->stationid,
 365          dev->base_addr,dev->irq);
 366
 367   return 0;
 368 }
 369
 370
 371 /****************************************************************************
 372  *                                                                          *
 373  * Utility routines                                                         *
 374  *                                                                          *
 375  ****************************************************************************/
 376
 377 /* Do a hardware reset on the card, and set up necessary registers.
 378  *
 379  * This should be called as little as possible, because it disrupts the
 380  * token on the network (causes a RECON) and requires a significant delay.
 381  *
 382  * However, it does make sure the card is in a defined state.
 383  */
 384 int arc90io_reset(struct net_device *dev,int reset_delay)
 385 {
 386   struct arcnet_local *lp=(struct arcnet_local *)dev->priv;
 387   short ioaddr=dev->base_addr;
 388   int delayval,recbuf=lp->recbuf;
 389
 390   if (reset_delay==3)
 391     {
 392       ARCRESET;
 393       return 0;
 394     }
 395
 396   /* no IRQ's, please! */
 397   lp->intmask=0;
 398   SETMASK;
 399
 400   BUGMSG(D_INIT,"Resetting %s (status=%Xh)\n",
 401          dev->name,ARCSTATUS);
 402
 403   /* Set the thing to IO-mapped, 8-bit  mode */
 404   lp->config = (0x1C|IOMAPflag) & ~ENABLE16flag;
 405   SETCONF;
 406
 407   if (reset_delay)
 408     {
 409       /* reset the card */
 410       ARCRESET;
 411       JIFFER(RESETtime);
 412     }
 413
 414   ACOMMAND(CFLAGScmd|RESETclear); /* clear flags & end reset */
 415   ACOMMAND(CFLAGScmd|CONFIGclear);
 416
 417   /* verify that the ARCnet signature byte is present */
 418
 419   if (get_buffer_byte(dev,0) != TESTvalue)
 420     {
 421       BUGMSG(D_NORMAL,"reset failed: TESTvalue not present.\n");
 422       return 1;
 423     }
 424
 425   /* clear out status variables */
 426   recbuf=lp->recbuf=0;
 427   lp->txbuf=2;
 428
 429   /* enable extended (512-byte) packets */
 430   ACOMMAND(CONFIGcmd|EXTconf);
 431
 432   /* and enable receive of our first packet to the first buffer */
 433   EnableReceiver();
 434
 435   /* re-enable interrupts */
 436   lp->intmask|=NORXflag;
 437 #ifdef DETECT_RECONFIGS
 438   lp->intmask|=RECONflag;
 439 #endif
 440   SETMASK;
 441
 442   /* done!  return success. */
 443   return 0;
 444 }
 445
 446
 447 static void arc90io_openclose(int open)
 448 {
 449   if (open)
 450     MOD_INC_USE_COUNT;
 451   else
 452     MOD_DEC_USE_COUNT;
 453 }
 454
 455
 456 static void arc90io_setmask(struct net_device *dev, u_char mask)
 457 {
 458   short ioaddr=dev->base_addr;
 459
 460   AINTMASK(mask);
 461 }
 462
 463 static u_char arc90io_status(struct net_device *dev)
 464 {
 465   short ioaddr=dev->base_addr;
 466
 467   return ARCSTATUS;
 468 }
 469
 470 static void arc90io_command(struct net_device *dev, u_char cmd)
 471 {
 472   short ioaddr=dev->base_addr;
 473
 474   ACOMMAND(cmd);
 475 }
 476
 477
 478 /* The actual interrupt handler routine - handle various IRQ's generated
 479  * by the card.
 480  */
 481 static void
 482 arc90io_inthandler(struct net_device *dev)
 483 {
 484   struct arcnet_local *lp=(struct arcnet_local *)dev->priv;
 485   int ioaddr=dev->base_addr, status, boguscount = 3, didsomething;
 486
 487   AINTMASK(0);
 488
 489   BUGMSG(D_DURING,"in arc90io_inthandler (status=%Xh, intmask=%Xh)\n",
 490          ARCSTATUS,lp->intmask);
 491
 492   do
 493     {
 494       status = ARCSTATUS;
 495       didsomething=0;
 496
 497       /* RESET flag was enabled - card is resetting and if RX
 498        * is disabled, it's NOT because we just got a packet.
 499        */
 500       if (status & RESETflag)
 501         {
 502           BUGMSG(D_NORMAL,"spurious reset (status=%Xh)\n",
 503                  status);
 504           arc90io_reset(dev,0);
 505
 506           /* all other flag values are just garbage */
 507           break;
 508         }
 509
 510       /* RX is inhibited - we must have received something. */
 511       if (status & lp->intmask & NORXflag)
 512         {
 513           int recbuf=lp->recbuf=!lp->recbuf;
 514           int oldaddr=0;
 515
 516           BUGMSG(D_DURING,"receive irq (status=%Xh)\n",
 517                  status);
 518
 519           /* enable receive of our next packet */
 520           EnableReceiver();
 521
 522           if (lp->intx)
 523             oldaddr=(inb(_ADDR_HI)<<8) | inb(_ADDR_LO);
 524
 525
 526           /* Got a packet. */
 527           arc90io_rx(dev,!recbuf);
 528
 529
 530           if (lp->intx)
 531             {
 532               outb( (oldaddr >> 8),  _ADDR_HI);
 533               outb( oldaddr & 0xff, _ADDR_LO);
 534             }
 535
 536           didsomething++;
 537         }
 538
 539       /* it can only be an xmit-done irq if we're xmitting :) */
 540       /*if (status&TXFREEflag && !lp->in_txhandler && lp->sending)*/
 541       if (status & lp->intmask & TXFREEflag)
 542         {
 543           struct Outgoing *out=&(lp->outgoing);
 544           int was_sending=lp->sending;
 545
 546           lp->intmask &= ~TXFREEflag;
 547
 548           lp->in_txhandler++;
 549           if (was_sending) lp->sending--;
 550
 551           BUGMSG(D_DURING,"TX IRQ (stat=%Xh, numsegs=%d, segnum=%d, skb=%ph)\n",
 552                  status,out->numsegs,out->segnum,out->skb);
 553
 554           if (was_sending && !(status&TXACKflag))
 555             {
 556               if (lp->lasttrans_dest != 0)
 557                 {
 558                   BUGMSG(D_EXTRA,"transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
 559                          status,lp->lasttrans_dest);
 560                   lp->stats.tx_errors++;
 561                   lp->stats.tx_carrier_errors++;
 562                 }
 563               else
 564                 {
 565                   BUGMSG(D_DURING,"broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
 566                          status,
 567                          lp->lasttrans_dest);
 568                 }
 569             }
 570
 571           /* send packet if there is one */
 572           arcnet_go_tx(dev,0);
 573           didsomething++;
 574
 575           if (lp->intx)
 576             {
 577               BUGMSG(D_DURING,"TXDONE while intx! (status=%Xh, intx=%d)\n",
 578                      ARCSTATUS,lp->intx);
 579               lp->in_txhandler--;
 580               continue;
 581             }
 582
 583           if (!lp->outgoing.skb)
 584             {
 585               BUGMSG(D_DURING,"TX IRQ done: no split to continue.\n");
 586
 587               /* inform upper layers */
 588               if (!lp->txready) arcnet_tx_done(dev, lp);
 589               lp->in_txhandler--;
 590               continue;
 591             }
 592
 593           /* if more than one segment, and not all segments
 594            * are done, then continue xmit.
 595            */
 596           if (out->segnum<out->numsegs)
 597             arcnetA_continue_tx(dev);
 598           arcnet_go_tx(dev,0);
 599
 600           /* if segnum==numsegs, the transmission is finished;
 601            * free the skb.
 602            */
 603           if (out->segnum>=out->numsegs)
 604             {
 605               /* transmit completed */
 606               out->segnum++;
 607               if (out->skb)
 608                 {
 609                   lp->stats.tx_bytes += out->skb->len;
 610                   dev_kfree_skb(out->skb);
 611                 }
 612               out->skb=NULL;
 613
 614               /* inform upper layers */
 615               if (!lp->txready) arcnet_tx_done(dev, lp);
 616             }
 617           didsomething++;
 618
 619           lp->in_txhandler--;
 620         }
 621       else if (lp->txready && !lp->sending && !lp->intx)
 622         {
 623           BUGMSG(D_NORMAL,"recovery from silent TX (status=%Xh)\n",
 624                  status);
 625           arcnet_go_tx(dev,0);
 626           didsomething++;
 627         }
 628
 629 #ifdef DETECT_RECONFIGS
 630       if (status & (lp->intmask) & RECONflag)
 631         {
 632           ACOMMAND(CFLAGScmd|CONFIGclear);
 633           lp->stats.tx_carrier_errors++;
 634
 635 #ifdef SHOW_RECONFIGS
 636           BUGMSG(D_NORMAL,"Network reconfiguration detected"
 637                  " (status=%Xh, config=%X)\n",
 638                  status,lp->config);
 639 #endif /* SHOW_RECONFIGS */
 640
 641 #ifdef RECON_THRESHOLD
 642           /* is the RECON info empty or old? */
 643           if (!lp->first_recon || !lp->last_recon ||
 644               jiffies-lp->last_recon > HZ*10)
 645             {
 646               if (lp->network_down)
 647                 BUGMSG(D_NORMAL,"reconfiguration detected: cabling restored?\n");
 648               lp->first_recon=lp->last_recon=jiffies;
 649               lp->num_recons=lp->network_down=0;
 650
 651               BUGMSG(D_DURING,"recon: clearing counters.\n");
 652             }
 653           else /* add to current RECON counter */
 654             {
 655               lp->last_recon=jiffies;
 656               lp->num_recons++;
 657
 658               BUGMSG(D_DURING,"recon: counter=%d, time=%lds, net=%d\n",
 659                      lp->num_recons,
 660                      (lp->last_recon-lp->first_recon)/HZ,
 661                      lp->network_down);
 662
 663               /* if network is marked up;
 664                * and first_recon and last_recon are 60+ sec
 665                *   apart;
 666                * and the average no. of recons counted is
 667                *   > RECON_THRESHOLD/min;
 668                * then print a warning message.
 669                */
 670               if (!lp->network_down
 671                   && (lp->last_recon-lp->first_recon)<=HZ*60
 672                   && lp->num_recons >= RECON_THRESHOLD)
 673                 {
 674                   lp->network_down=1;
 675                   BUGMSG(D_NORMAL,"many reconfigurations detected: cabling problem?\n");
 676                 }
 677               else if (!lp->network_down
 678                        && lp->last_recon-lp->first_recon > HZ*60)
 679                 {
 680                   /* reset counters if we've gone for
 681                    * over a minute.
 682                    */
 683                   lp->first_recon=lp->last_recon;
 684                   lp->num_recons=1;
 685                 }
 686             }
 687         }
 688       else if (lp->network_down && jiffies-lp->last_recon > HZ*10)
 689         {
 690           if (lp->network_down)
 691             BUGMSG(D_NORMAL,"cabling restored?\n");
 692           lp->first_recon=lp->last_recon=0;
 693           lp->num_recons=lp->network_down=0;
 694
 695           BUGMSG(D_DURING,"not recon: clearing counters anyway.\n");
 696 #endif
 697         }
 698 #endif /* DETECT_RECONFIGS */
 699     } while (--boguscount && didsomething);
 700
 701   BUGMSG(D_DURING,"net_interrupt complete (status=%Xh, count=%d)\n",
 702          ARCSTATUS,boguscount);
 703   BUGMSG(D_DURING,"\n");
 704
 705   SETMASK;      /* put back interrupt mask */
 706 }
 707
 708
 709 /* A packet has arrived; grab it from the buffers and pass it to the generic
 710  * arcnet_rx routing to deal with it.
 711  */
 712
 713 static void
 714 arc90io_rx(struct net_device *dev,int recbuf)
 715 {
 716   struct arcnet_local *lp = (struct arcnet_local *)dev->priv;
 717   int ioaddr=dev->base_addr;
 718   union ArcPacket packetbuf;
 719   union ArcPacket *arcpacket=&packetbuf;
 720   u_char *arcsoft;
 721   short length,offset;
 722   u_char daddr,saddr;
 723
 724   lp->stats.rx_packets++;
 725
 726   get_whole_buffer(dev,recbuf*512,4,(char *)arcpacket);
 727
 728   saddr=arcpacket->hardheader.source;
 729
 730   /* if source is 0, it's a "used" packet! */
 731   if (saddr==0)
 732     {
 733       BUGMSG(D_NORMAL,"discarding old packet. (status=%Xh)\n",
 734              ARCSTATUS);
 735       lp->stats.rx_errors++;
 736       return;
 737     }
 738   /* Set source address to zero to mark it as old */
 739
 740   put_buffer_byte(dev,recbuf*512,0);
 741
 742   arcpacket->hardheader.source=0;
 743
 744   daddr=arcpacket->hardheader.destination;
 745
 746   if (arcpacket->hardheader.offset1) /* Normal Packet */
 747     {
 748       offset=arcpacket->hardheader.offset1;
 749       arcsoft=&arcpacket->raw[offset];
 750       length=256-offset;
 751     }
 752   else          /* ExtendedPacket or ExceptionPacket */
 753     {
 754       offset=arcpacket->hardheader.offset2;
 755       arcsoft=&arcpacket->raw[offset];
 756       length=512-offset;
 757     }
 758
 759   get_whole_buffer(dev,recbuf*512+offset,length,(char *)arcpacket+offset);
 760
 761   arcnet_rx(lp, arcsoft, length, saddr, daddr);
 762
 763   BUGLVL(D_RX) arcnet_dump_packet(lp->adev,arcpacket->raw,length>240,"rx");
 764 }
 765
 766
 767 /* Given an skb, copy a packet into the ARCnet buffers for later transmission
 768  * by arcnet_go_tx.
 769  */
 770 static void
 771 arc90io_prepare_tx(struct net_device *dev,u_char *hdr,int hdrlen,
 772                     char *data,int length,int daddr,int exceptA, int offset)
 773 {
 774   struct arcnet_local *lp = (struct arcnet_local *)dev->priv;
 775
 776   lp->txbuf=lp->txbuf^1;        /* XOR with 1 to alternate between 2 and 3 */
 777
 778   length+=hdrlen;
 779
 780   BUGMSG(D_TX,"arcnetAS_prep_tx: hdr:%ph, length:%d, data:%ph\n",
 781          hdr,length,data);
 782
 783   put_buffer_byte(dev, lp->txbuf*512+1, daddr);
 784
 785   /* load packet into shared memory */
 786   if (length<=MTU)      /* Normal (256-byte) Packet */
 787     put_buffer_byte(dev, lp->txbuf*512+2, offset=offset?offset:256-length);
 788
 789   else if (length>=MinTU || offset)     /* Extended (512-byte) Packet */
 790     {
 791       put_buffer_byte(dev, lp->txbuf*512+2, 0);
 792       put_buffer_byte(dev, lp->txbuf*512+3, offset=offset?offset:512-length);
 793     }
 794   else if (exceptA)             /* RFC1201 Exception Packet */
 795     {
 796       put_buffer_byte(dev, lp->txbuf*512+2, 0);
 797       put_buffer_byte(dev, lp->txbuf*512+3, offset=512-length-4);
 798
 799       /* exception-specific stuff - these four bytes
 800        * make the packet long enough to fit in a 512-byte
 801        * frame.
 802        */
 803
 804       put_buffer_byte(dev, lp->txbuf*512+offset,hdr[0]);
 805       put_whole_buffer(dev, lp->txbuf*512+offset+1,3,"\377\377\377");
 806       offset+=4;
 807     }
 808   else                          /* "other" Exception packet */
 809     {
 810       /* RFC1051 - set 4 trailing bytes to 0 */
 811
 812       put_whole_buffer(dev,lp->txbuf*512+508,4,"\0\0\0\0");
 813
 814       /* now round up to MinTU */
 815       put_buffer_byte(dev, lp->txbuf*512+2, 0);
 816       put_buffer_byte(dev, lp->txbuf*512+3, offset=512-MinTU);
 817     }
 818
 819   /* copy the packet into ARCnet shmem
 820    *  - the first bytes of ClientData header are skipped
 821    */
 822
 823   put_whole_buffer(dev, 512*lp->txbuf+offset, hdrlen,(u_char *)hdr);
 824   put_whole_buffer(dev, 512*lp->txbuf+offset+hdrlen,length-hdrlen,data);
 825
 826   BUGMSG(D_DURING,"transmitting packet to station %02Xh (%d bytes)\n",
 827          daddr,length);
 828
 829   lp->lastload_dest=daddr;
 830   lp->txready=lp->txbuf;        /* packet is ready for sending */
 831 }
 832
 833
 834 /****************************************************************************
 835  *                                                                          *
 836  * Kernel Loadable Module Support                                           *
 837  *                                                                          *
 838  ****************************************************************************/
 839
 840
 841 #ifdef MODULE
 842
 843 static struct net_device *cards[16]={NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
 844                           NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
 845
 846
 847 int init_module(void)
 848 {
 849   struct net_device *dev=cards[0];
 850
 851   cards[0]=dev=(struct net_device *)kmalloc(sizeof(struct net_device), GFP_KERNEL);
 852   if (!dev)
 853     return -ENOMEM;
 854
 855   memset(dev, 0, sizeof(struct net_device));
 856
 857   dev->name=(char *)kmalloc(9, GFP_KERNEL);
 858   if (!dev->name)
 859     {
 860       kfree(dev);
 861       return -ENOMEM;
 862     }
 863   dev->init=arc90io_probe;
 864
 865   if (device)
 866     strcpy(dev->name,device);
 867   else arcnet_makename(dev->name);
 868
 869   dev->base_addr=io;
 870   dev->irq=irq;
 871
 872   if (dev->irq==2) dev->irq=9;
 873
 874   if (register_netdev(dev) != 0)
 875     return -EIO;
 876
 877   /* Increase use count of arcnet.o */
 878   arcnet_use_count(1);
 879   return 0;
 880 }
 881
 882 void cleanup_module(void)
 883 {
 884   struct net_device *dev=cards[0];
 885   int ioaddr=dev->base_addr;
 886
 887   if (dev->start) (*dev->stop)(dev);
 888
 889   /* Flush TX and disable RX */
 890   if (ioaddr)
 891     {
 892       AINTMASK(0);              /* disable IRQ's */
 893       ACOMMAND(NOTXcmd);        /* stop transmit */
 894       ACOMMAND(NORXcmd);        /* disable receive */
 895
 896       /* Set the thing back to MMAP mode, in case the old
 897                  driver is loaded later */
 898       outb( (inb(_CONFIG)&~IOMAPflag),_CONFIG);
 899     }
 900
 901   if (dev->irq)
 902     {
 903       free_irq(dev->irq,dev);
 904     }
 905
 906   if (dev->base_addr) release_region(dev->base_addr,ARCNET_TOTAL_SIZE);
 907   unregister_netdev(dev);
 908   kfree(dev->priv);
 909   dev->priv = NULL;
 910
 911   /* Decrease use count of arcnet.o */
 912   arcnet_use_count(0);
 913 }
 914
 915 #else
 916
 917 void __init com90io_setup (char *str, int *ints)
 918 {
 919   struct net_device *dev;
 920
 921   if (arcnet_num_devs == MAX_ARCNET_DEVS)
 922     {
 923       printk("com90xx IO-MAP: Too many ARCnet devices registered (max %d).\n",
 924              MAX_ARCNET_DEVS);
 925       return;
 926     }
 927
 928   dev=&arcnet_devs[arcnet_num_devs];
 929
 930   if (ints[0] < 1)
 931     {
 932       printk("com90xx IO-MAP: You must give an IO address.\n");
 933       return;
 934     }
 935
 936   dev->init=arc90io_probe;
 937
 938   switch(ints[0])
 939     {
 940     case 3: /* ERROR */
 941       printk("com90xx IO-MAP: Too many arguments.\n");
 942
 943     case 2: /* IRQ */
 944       dev->irq=ints[2];
 945
 946     case 1: /* IO address */
 947       dev->base_addr=ints[1];
 948     }
 949
 950   dev->name = (char *)&arcnet_dev_names[arcnet_num_devs];
 951
 952   if (str)
 953     strncpy(dev->name, str, 9);
 954
 955   arcnet_num_devs++;
 956 }
 957
 958 #endif /* MODULE */