drivers/net/ibmlana.c

   1 /*
   2 net-3-driver for the IBM LAN Adapter/A
   3
   4 This is an extension to the Linux operating system, and is covered by the
   5 same GNU General Public License that covers that work.
   6
   7 Copyright 1999 by Alfred Arnold (alfred@ccac.rwth-aachen.de,
   8                                  alfred.arnold@lancom.de)
   9
  10 This driver is based both on the SK_MCA driver, which is itself based on the
  11 SK_G16 and 3C523 driver.
  12
  13 paper sources:
  14   'PC Hardware: Aufbau, Funktionsweise, Programmierung' by
  15   Hans-Peter Messmer for the basic Microchannel stuff
  16
  17   'Linux Geraetetreiber' by Allesandro Rubini, Kalle Dalheimer
  18   for help on Ethernet driver programming
  19
  20   'DP83934CVUL-20/25 MHz SONIC-T Ethernet Controller Datasheet' by National
  21   Semiconductor for info on the MAC chip
  22
  23   'LAN Technical Reference Ethernet Adapter Interface Version 1 Release 1.0
  24    Document Number SC30-3661-00' by IBM for info on the adapter itself
  25
  26   Also see http://www.natsemi.com/
  27
  28 special acknowledgements to:
  29   - Bob Eager for helping me out with documentation from IBM
  30   - Jim Shorney for his endless patience with me while I was using
  31     him as a beta tester to trace down the address filter bug ;-)
  32
  33   Missing things:
  34
  35   -> set debug level via ioctl instead of compile-time switches
  36   -> I didn't follow the development of the 2.1.x kernels, so my
  37      assumptions about which things changed with which kernel version
  38      are probably nonsense
  39
  40 History:
  41   Nov 6th, 1999
  42         startup from SK_MCA driver
  43   Dec 6th, 1999
  44         finally got docs about the card.  A big thank you to Bob Eager!
  45   Dec 12th, 1999
  46         first packet received
  47   Dec 13th, 1999
  48         recv queue done, tcpdump works
  49   Dec 15th, 1999
  50         transmission part works
  51   Dec 28th, 1999
  52         added usage of the isa_functions for Linux 2.3 .  Things should
  53         still work with 2.0.x....
  54   Jan 28th, 2000
  55         in Linux 2.2.13, the version.h file mysteriously didn't get
  56         included.  Added a workaround for this.  Futhermore, it now
  57         not only compiles as a modules ;-)
  58   Jan 30th, 2000
  59         newer kernels automatically probe more than one board, so the
  60         'startslot' as a variable is also needed here
  61   Apr 12th, 2000
  62         the interrupt mask register is not set 'hard' instead of individually
  63         setting registers, since this seems to set bits that shouldn't be
  64         set
  65   May 21st, 2000
  66         reset interrupt status immediately after CAM load
  67         add a recovery delay after releasing the chip's reset line
  68   May 24th, 2000
  69         finally found the bug in the address filter setup - damned signed
  70         chars!
  71   June 1st, 2000
  72         corrected version codes, added support for the latest 2.3 changes
  73   Oct 28th, 2002
  74         cleaned up for the 2.5 tree <alan@redhat.com>
  75
  76  *************************************************************************/
  77
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/ioport.h>
  82 #include <linux/slab.h>
  83 #include <linux/interrupt.h>
  84 #include <linux/delay.h>
  85 #include <linux/time.h>
  86 #include <linux/mca-legacy.h>
  87 #include <linux/module.h>
  88 #include <linux/netdevice.h>
  89 #include <linux/etherdevice.h>
  90 #include <linux/skbuff.h>
  91 #include <linux/bitops.h>
  92
  93 #include <asm/processor.h>
  94 #include <asm/io.h>
  95
  96 #define _IBM_LANA_DRIVER_
  97 #include "ibmlana.h"
  98
  99 #undef DEBUG
 100
 101 #define DRV_NAME "ibmlana"
 102
 103 /* ------------------------------------------------------------------------
 104  * global static data - not more since we can handle multiple boards and
 105  * have to pack all state info into the device struct!
 106  * ------------------------------------------------------------------------ */
 107
 108 static char *MediaNames[Media_Count] = {
 109         "10BaseT", "10Base5", "Unknown", "10Base2"
 110 };
 111
 112 /* ------------------------------------------------------------------------
 113  * private subfunctions
 114  * ------------------------------------------------------------------------ */
 115
 116 #ifdef DEBUG
 117   /* dump all registers */
 118
 119 static void dumpregs(struct net_device *dev)
 120 {
 121         int z;
 122
 123         for (z = 0; z < 160; z += 2) {
 124                 if (!(z & 15))
 125                         printk("REGS: %04x:", z);
 126                 printk(" %04x", inw(dev->base_addr + z));
 127                 if ((z & 15) == 14)
 128                         printk("\n");
 129         }
 130 }
 131
 132 /* dump parts of shared memory - only needed during debugging */
 133
 134 static void dumpmem(struct net_device *dev, u32 start, u32 len)
 135 {
 136         ibmlana_priv *priv = netdev_priv(dev);
 137         int z;
 138
 139         printk("Address %04x:\n", start);
 140         for (z = 0; z < len; z++) {
 141                 if ((z & 15) == 0)
 142                         printk("%04x:", z);
 143                 printk(" %02x", readb(priv->base + start + z));
 144                 if ((z & 15) == 15)
 145                         printk("\n");
 146         }
 147         if ((z & 15) != 0)
 148                 printk("\n");
 149 }
 150
 151 /* print exact time - ditto */
 152
 153 static void PrTime(void)
 154 {
 155         struct timeval tv;
 156
 157         do_gettimeofday(&tv);
 158         printk("%9d:%06d: ", (int) tv.tv_sec, (int) tv.tv_usec);
 159 }
 160 #endif                          /* DEBUG */
 161
 162 /* deduce resources out of POS registers */
 163
 164 static void getaddrs(int slot, int *base, int *memlen, int *iobase,
 165                      int *irq, ibmlana_medium * medium)
 166 {
 167         u_char pos0, pos1;
 168
 169         pos0 = mca_read_stored_pos(slot, 2);
 170         pos1 = mca_read_stored_pos(slot, 3);
 171
 172         *base = 0xc0000 + ((pos1 & 0xf0) << 9);
 173         *memlen = (pos1 & 0x01) ? 0x8000 : 0x4000;
 174         *iobase = (pos0 & 0xe0) << 7;
 175         switch (pos0 & 0x06) {
 176         case 0:
 177                 *irq = 5;
 178                 break;
 179         case 2:
 180                 *irq = 15;
 181                 break;
 182         case 4:
 183                 *irq = 10;
 184                 break;
 185         case 6:
 186                 *irq = 11;
 187                 break;
 188         }
 189         *medium = (pos0 & 0x18) >> 3;
 190 }
 191
 192 /* wait on register value with mask and timeout */
 193
 194 static int wait_timeout(struct net_device *dev, int regoffs, u16 mask,
 195                         u16 value, int timeout)
 196 {
 197         unsigned long fin = jiffies + timeout;
 198
 199         while (time_before(jiffies,fin))
 200                 if ((inw(dev->base_addr + regoffs) & mask) == value)
 201                         return 1;
 202
 203         return 0;
 204 }
 205
 206
 207 /* reset the whole board */
 208
 209 static void ResetBoard(struct net_device *dev)
 210 {
 211         unsigned char bcmval;
 212
 213         /* read original board control value */
 214
 215         bcmval = inb(dev->base_addr + BCMREG);
 216
 217         /* set reset bit for a while */
 218
 219         bcmval |= BCMREG_RESET;
 220         outb(bcmval, dev->base_addr + BCMREG);
 221         udelay(10);
 222         bcmval &= ~BCMREG_RESET;
 223         outb(bcmval, dev->base_addr + BCMREG);
 224
 225         /* switch over to RAM again */
 226
 227         bcmval |= BCMREG_RAMEN | BCMREG_RAMWIN;
 228         outb(bcmval, dev->base_addr + BCMREG);
 229 }
 230
 231 /* calculate RAM layout & set up descriptors in RAM */
 232
 233 static void InitDscrs(struct net_device *dev)
 234 {
 235         ibmlana_priv *priv = netdev_priv(dev);
 236         u32 addr, baddr, raddr;
 237         int z;
 238         tda_t tda;
 239         rda_t rda;
 240         rra_t rra;
 241
 242         /* initialize RAM */
 243
 244         memset_io(priv->base, 0xaa,
 245                       dev->mem_start - dev->mem_start); /* XXX: typo? */
 246
 247         /* setup n TX descriptors - independent of RAM size */
 248
 249         priv->tdastart = addr = 0;
 250         priv->txbufstart = baddr = sizeof(tda_t) * TXBUFCNT;
 251         for (z = 0; z < TXBUFCNT; z++) {
 252                 tda.status = 0;
 253                 tda.config = 0;
 254                 tda.length = 0;
 255                 tda.fragcount = 1;
 256                 tda.startlo = baddr;
 257                 tda.starthi = 0;
 258                 tda.fraglength = 0;
 259                 if (z == TXBUFCNT - 1)
 260                         tda.link = priv->tdastart;
 261                 else
 262                         tda.link = addr + sizeof(tda_t);
 263                 tda.link |= 1;
 264                 memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));
 265                 addr += sizeof(tda_t);
 266                 baddr += PKTSIZE;
 267         }
 268
 269         /* calculate how many receive buffers fit into remaining memory */
 270
 271         priv->rxbufcnt = (dev->mem_end - dev->mem_start - baddr) / (sizeof(rra_t) + sizeof(rda_t) + PKTSIZE);
 272
 273         /* calculate receive addresses */
 274
 275         priv->rrastart = raddr = priv->txbufstart + (TXBUFCNT * PKTSIZE);
 276         priv->rdastart = addr = priv->rrastart + (priv->rxbufcnt * sizeof(rra_t));
 277         priv->rxbufstart = baddr = priv->rdastart + (priv->rxbufcnt * sizeof(rda_t));
 278
 279         for (z = 0; z < priv->rxbufcnt; z++) {
 280                 rra.startlo = baddr;
 281                 rra.starthi = 0;
 282                 rra.cntlo = PKTSIZE >> 1;
 283                 rra.cnthi = 0;
 284                 memcpy_toio(priv->base + raddr, &rra, sizeof(rra_t));
 285
 286                 rda.status = 0;
 287                 rda.length = 0;
 288                 rda.startlo = 0;
 289                 rda.starthi = 0;
 290                 rda.seqno = 0;
 291                 if (z < priv->rxbufcnt - 1)
 292                         rda.link = addr + sizeof(rda_t);
 293                 else
 294                         rda.link = 1;
 295                 rda.inuse = 1;
 296                 memcpy_toio(priv->base + addr, &rda, sizeof(rda_t));
 297
 298                 baddr += PKTSIZE;
 299                 raddr += sizeof(rra_t);
 300                 addr += sizeof(rda_t);
 301         }
 302
 303         /* initialize current pointers */
 304
 305         priv->nextrxdescr = 0;
 306         priv->lastrxdescr = priv->rxbufcnt - 1;
 307         priv->nexttxdescr = 0;
 308         priv->currtxdescr = 0;
 309         priv->txusedcnt = 0;
 310         memset(priv->txused, 0, sizeof(priv->txused));
 311 }
 312
 313 /* set up Rx + Tx descriptors in SONIC */
 314
 315 static int InitSONIC(struct net_device *dev)
 316 {
 317         ibmlana_priv *priv = netdev_priv(dev);
 318
 319         /* set up start & end of resource area */
 320
 321         outw(0, SONIC_URRA);
 322         outw(priv->rrastart, dev->base_addr + SONIC_RSA);
 323         outw(priv->rrastart + (priv->rxbufcnt * sizeof(rra_t)), dev->base_addr + SONIC_REA);
 324         outw(priv->rrastart, dev->base_addr + SONIC_RRP);
 325         outw(priv->rrastart, dev->base_addr + SONIC_RWP);
 326
 327         /* set EOBC so that only one packet goes into one buffer */
 328
 329         outw((PKTSIZE - 4) >> 1, dev->base_addr + SONIC_EOBC);
 330
 331         /* let SONIC read the first RRA descriptor */
 332
 333         outw(CMDREG_RRRA, dev->base_addr + SONIC_CMDREG);
 334         if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_RRRA, 0, 2)) {
 335                 printk(KERN_ERR "%s: SONIC did not respond on RRRA command - giving up.", dev->name);
 336                 return 0;
 337         }
 338
 339         /* point SONIC to the first RDA */
 340
 341         outw(0, dev->base_addr + SONIC_URDA);
 342         outw(priv->rdastart, dev->base_addr + SONIC_CRDA);
 343
 344         /* set upper half of TDA address */
 345
 346         outw(0, dev->base_addr + SONIC_UTDA);
 347
 348         return 1;
 349 }
 350
 351 /* stop SONIC so we can reinitialize it */
 352
 353 static void StopSONIC(struct net_device *dev)
 354 {
 355         /* disable interrupts */
 356
 357         outb(inb(dev->base_addr + BCMREG) & (~BCMREG_IEN), dev->base_addr + BCMREG);
 358         outb(0, dev->base_addr + SONIC_IMREG);
 359
 360         /* reset the SONIC */
 361
 362         outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
 363         udelay(10);
 364         outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
 365 }
 366
 367 /* initialize card and SONIC for proper operation */
 368
 369 static void putcam(camentry_t * cams, int *camcnt, char *addr)
 370 {
 371         camentry_t *pcam = cams + (*camcnt);
 372         u8 *uaddr = (u8 *) addr;
 373
 374         pcam->index = *camcnt;
 375         pcam->addr0 = (((u16) uaddr[1]) << 8) | uaddr[0];
 376         pcam->addr1 = (((u16) uaddr[3]) << 8) | uaddr[2];
 377         pcam->addr2 = (((u16) uaddr[5]) << 8) | uaddr[4];
 378         (*camcnt)++;
 379 }
 380
 381 static void InitBoard(struct net_device *dev)
 382 {
 383         ibmlana_priv *priv = netdev_priv(dev);
 384         int camcnt;
 385         camentry_t cams[16];
 386         u32 cammask;
 387         struct dev_mc_list *mcptr;
 388         u16 rcrval;
 389
 390         /* reset the SONIC */
 391
 392         outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
 393         udelay(10);
 394
 395         /* clear all spurious interrupts */
 396
 397         outw(inw(dev->base_addr + SONIC_ISREG), dev->base_addr + SONIC_ISREG);
 398
 399         /* set up the SONIC's bus interface - constant for this adapter -
 400            must be done while the SONIC is in reset */
 401
 402         outw(DCREG_USR1 | DCREG_USR0 | DCREG_WC1 | DCREG_DW32, dev->base_addr + SONIC_DCREG);
 403         outw(0, dev->base_addr + SONIC_DCREG2);
 404
 405         /* remove reset form the SONIC */
 406
 407         outw(0, dev->base_addr + SONIC_CMDREG);
 408         udelay(10);
 409
 410         /* data sheet requires URRA to be programmed before setting up the CAM contents */
 411
 412         outw(0, dev->base_addr + SONIC_URRA);
 413
 414         /* program the CAM entry 0 to the device address */
 415
 416         camcnt = 0;
 417         putcam(cams, &camcnt, dev->dev_addr);
 418
 419         /* start putting the multicast addresses into the CAM list.  Stop if
 420            it is full. */
 421
 422         for (mcptr = dev->mc_list; mcptr != NULL; mcptr = mcptr->next) {
 423                 putcam(cams, &camcnt, mcptr->dmi_addr);
 424                 if (camcnt == 16)
 425                         break;
 426         }
 427
 428         /* calculate CAM mask */
 429
 430         cammask = (1 << camcnt) - 1;
 431
 432         /* feed CDA into SONIC, initialize RCR value (always get broadcasts) */
 433
 434         memcpy_toio(priv->base, cams, sizeof(camentry_t) * camcnt);
 435         memcpy_toio(priv->base + (sizeof(camentry_t) * camcnt), &cammask, sizeof(cammask));
 436
 437 #ifdef DEBUG
 438         printk("CAM setup:\n");
 439         dumpmem(dev, 0, sizeof(camentry_t) * camcnt + sizeof(cammask));
 440 #endif
 441
 442         outw(0, dev->base_addr + SONIC_CAMPTR);
 443         outw(camcnt, dev->base_addr + SONIC_CAMCNT);
 444         outw(CMDREG_LCAM, dev->base_addr + SONIC_CMDREG);
 445         if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_LCAM, 0, 2)) {
 446                 printk(KERN_ERR "%s:SONIC did not respond on LCAM command - giving up.", dev->name);
 447                 return;
 448         } else {
 449                 /* clear interrupt condition */
 450
 451                 outw(ISREG_LCD, dev->base_addr + SONIC_ISREG);
 452
 453 #ifdef DEBUG
 454                 printk("Loading CAM done, address pointers %04x:%04x\n",
 455                        inw(dev->base_addr + SONIC_URRA),
 456                        inw(dev->base_addr + SONIC_CAMPTR));
 457                 {
 458                         int z;
 459
 460                         printk("\n-->CAM: PTR %04x CNT %04x\n",
 461                                inw(dev->base_addr + SONIC_CAMPTR),
 462                                inw(dev->base_addr + SONIC_CAMCNT));
 463                         outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
 464                         for (z = 0; z < camcnt; z++) {
 465                                 outw(z, dev->base_addr + SONIC_CAMEPTR);
 466                                 printk("Entry %d: %04x %04x %04x\n", z,
 467                                        inw(dev->base_addr + SONIC_CAMADDR0),
 468                                        inw(dev->base_addr + SONIC_CAMADDR1),
 469                                        inw(dev->base_addr + SONIC_CAMADDR2));
 470                         }
 471                         outw(0, dev->base_addr + SONIC_CMDREG);
 472                 }
 473 #endif
 474         }
 475
 476         rcrval = RCREG_BRD | RCREG_LB_NONE;
 477
 478         /* if still multicast addresses left or ALLMULTI is set, set the multicast
 479            enable bit */
 480
 481         if ((dev->flags & IFF_ALLMULTI) || (mcptr != NULL))
 482                 rcrval |= RCREG_AMC;
 483
 484         /* promiscous mode ? */
 485
 486         if (dev->flags & IFF_PROMISC)
 487                 rcrval |= RCREG_PRO;
 488
 489         /* program receive mode */
 490
 491         outw(rcrval, dev->base_addr + SONIC_RCREG);
 492 #ifdef DEBUG
 493         printk("\nRCRVAL: %04x\n", rcrval);
 494 #endif
 495
 496         /* set up descriptors in shared memory + feed them into SONIC registers */
 497
 498         InitDscrs(dev);
 499         if (!InitSONIC(dev))
 500                 return;
 501
 502         /* reset all pending interrupts */
 503
 504         outw(0xffff, dev->base_addr + SONIC_ISREG);
 505
 506         /* enable transmitter + receiver interrupts */
 507
 508         outw(CMDREG_RXEN, dev->base_addr + SONIC_CMDREG);
 509         outw(IMREG_PRXEN | IMREG_RBEEN | IMREG_PTXEN | IMREG_TXEREN, dev->base_addr + SONIC_IMREG);
 510
 511         /* turn on card interrupts */
 512
 513         outb(inb(dev->base_addr + BCMREG) | BCMREG_IEN, dev->base_addr + BCMREG);
 514
 515 #ifdef DEBUG
 516         printk("Register dump after initialization:\n");
 517         dumpregs(dev);
 518 #endif
 519 }
 520
 521 /* start transmission of a descriptor */
 522
 523 static void StartTx(struct net_device *dev, int descr)
 524 {
 525         ibmlana_priv *priv = netdev_priv(dev);
 526         int addr;
 527
 528         addr = priv->tdastart + (descr * sizeof(tda_t));
 529
 530         /* put descriptor address into SONIC */
 531
 532         outw(addr, dev->base_addr + SONIC_CTDA);
 533
 534         /* trigger transmitter */
 535
 536         priv->currtxdescr = descr;
 537         outw(CMDREG_TXP, dev->base_addr + SONIC_CMDREG);
 538 }
 539
 540 /* ------------------------------------------------------------------------
 541  * interrupt handler(s)
 542  * ------------------------------------------------------------------------ */
 543
 544 /* receive buffer area exhausted */
 545
 546 static void irqrbe_handler(struct net_device *dev)
 547 {
 548         ibmlana_priv *priv = netdev_priv(dev);
 549
 550         /* point the SONIC back to the RRA start */
 551
 552         outw(priv->rrastart, dev->base_addr + SONIC_RRP);
 553         outw(priv->rrastart, dev->base_addr + SONIC_RWP);
 554 }
 555
 556 /* receive interrupt */
 557
 558 static void irqrx_handler(struct net_device *dev)
 559 {
 560         ibmlana_priv *priv = netdev_priv(dev);
 561         rda_t rda;
 562         u32 rdaaddr, lrdaaddr;
 563
 564         /* loop until ... */
 565
 566         while (1) {
 567                 /* read descriptor that was next to be filled by SONIC */
 568
 569                 rdaaddr = priv->rdastart + (priv->nextrxdescr * sizeof(rda_t));
 570                 lrdaaddr = priv->rdastart + (priv->lastrxdescr * sizeof(rda_t));
 571                 memcpy_fromio(&rda, priv->base + rdaaddr, sizeof(rda_t));
 572
 573                 /* iron out upper word halves of fields we use - SONIC will duplicate
 574                    bits 0..15 to 16..31 */
 575
 576                 rda.status &= 0xffff;
 577                 rda.length &= 0xffff;
 578                 rda.startlo &= 0xffff;
 579
 580                 /* stop if the SONIC still owns it, i.e. there is no data for us */
 581
 582                 if (rda.inuse)
 583                         break;
 584
 585                 /* good packet? */
 586
 587                 else if (rda.status & RCREG_PRX) {
 588                         struct sk_buff *skb;
 589
 590                         /* fetch buffer */
 591
 592                         skb = dev_alloc_skb(rda.length + 2);
 593                         if (skb == NULL)
 594                                 priv->stat.rx_dropped++;
 595                         else {
 596                                 /* copy out data */
 597
 598                                 memcpy_fromio(skb_put(skb, rda.length),
 599                                                priv->base +
 600                                                rda.startlo, rda.length);
 601
 602                                 /* set up skb fields */
 603
 604                                 skb->protocol = eth_type_trans(skb, dev);
 605                                 skb->ip_summed = CHECKSUM_NONE;
 606
 607                                 /* bookkeeping */
 608                                 dev->last_rx = jiffies;
 609                                 priv->stat.rx_packets++;
 610                                 priv->stat.rx_bytes += rda.length;
 611
 612                                 /* pass to the upper layers */
 613                                 netif_rx(skb);
 614                         }
 615                 }
 616
 617                 /* otherwise check error status bits and increase statistics */
 618
 619                 else {
 620                         priv->stat.rx_errors++;
 621                         if (rda.status & RCREG_FAER)
 622                                 priv->stat.rx_frame_errors++;
 623                         if (rda.status & RCREG_CRCR)
 624                                 priv->stat.rx_crc_errors++;
 625                 }
 626
 627                 /* descriptor processed, will become new last descriptor in queue */
 628
 629                 rda.link = 1;
 630                 rda.inuse = 1;
 631                 memcpy_toio(priv->base + rdaaddr, &rda,
 632                              sizeof(rda_t));
 633
 634                 /* set up link and EOL = 0 in currently last descriptor. Only write
 635                    the link field since the SONIC may currently already access the
 636                    other fields. */
 637
 638                 memcpy_toio(priv->base + lrdaaddr + 20, &rdaaddr, 4);
 639
 640                 /* advance indices */
 641
 642                 priv->lastrxdescr = priv->nextrxdescr;
 643                 if ((++priv->nextrxdescr) >= priv->rxbufcnt)
 644                         priv->nextrxdescr = 0;
 645         }
 646 }
 647
 648 /* transmit interrupt */
 649
 650 static void irqtx_handler(struct net_device *dev)
 651 {
 652         ibmlana_priv *priv = netdev_priv(dev);
 653         tda_t tda;
 654
 655         /* fetch descriptor (we forgot the size ;-) */
 656         memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));
 657
 658         /* update statistics */
 659         priv->stat.tx_packets++;
 660         priv->stat.tx_bytes += tda.length;
 661
 662         /* update our pointers */
 663         priv->txused[priv->currtxdescr] = 0;
 664         priv->txusedcnt--;
 665
 666         /* if there are more descriptors present in RAM, start them */
 667         if (priv->txusedcnt > 0)
 668                 StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);
 669
 670         /* tell the upper layer we can go on transmitting */
 671         netif_wake_queue(dev);
 672 }
 673
 674 static void irqtxerr_handler(struct net_device *dev)
 675 {
 676         ibmlana_priv *priv = netdev_priv(dev);
 677         tda_t tda;
 678
 679         /* fetch descriptor to check status */
 680         memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));
 681
 682         /* update statistics */
 683         priv->stat.tx_errors++;
 684         if (tda.status & (TCREG_NCRS | TCREG_CRSL))
 685                 priv->stat.tx_carrier_errors++;
 686         if (tda.status & TCREG_EXC)
 687                 priv->stat.tx_aborted_errors++;
 688         if (tda.status & TCREG_OWC)
 689                 priv->stat.tx_window_errors++;
 690         if (tda.status & TCREG_FU)
 691                 priv->stat.tx_fifo_errors++;
 692
 693         /* update our pointers */
 694         priv->txused[priv->currtxdescr] = 0;
 695         priv->txusedcnt--;
 696
 697         /* if there are more descriptors present in RAM, start them */
 698         if (priv->txusedcnt > 0)
 699                 StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);
 700
 701         /* tell the upper layer we can go on transmitting */
 702         netif_wake_queue(dev);
 703 }
 704
 705 /* general interrupt entry */
 706
 707 static irqreturn_t irq_handler(int irq, void *device)
 708 {
 709         struct net_device *dev = (struct net_device *) device;
 710         u16 ival;
 711
 712         /* in case we're not meant... */
 713         if (!(inb(dev->base_addr + BCMREG) & BCMREG_IPEND))
 714                 return IRQ_NONE;
 715
 716         /* loop through the interrupt bits until everything is clear */
 717         while (1) {
 718                 ival = inw(dev->base_addr + SONIC_ISREG);
 719
 720                 if (ival & ISREG_RBE) {
 721                         irqrbe_handler(dev);
 722                         outw(ISREG_RBE, dev->base_addr + SONIC_ISREG);
 723                 }
 724                 if (ival & ISREG_PKTRX) {
 725                         irqrx_handler(dev);
 726                         outw(ISREG_PKTRX, dev->base_addr + SONIC_ISREG);
 727                 }
 728                 if (ival & ISREG_TXDN) {
 729                         irqtx_handler(dev);
 730                         outw(ISREG_TXDN, dev->base_addr + SONIC_ISREG);
 731                 }
 732                 if (ival & ISREG_TXER) {
 733                         irqtxerr_handler(dev);
 734                         outw(ISREG_TXER, dev->base_addr + SONIC_ISREG);
 735                 }
 736                 break;
 737         }
 738         return IRQ_HANDLED;
 739 }
 740
 741 /* ------------------------------------------------------------------------
 742  * driver methods
 743  * ------------------------------------------------------------------------ */
 744
 745 /* MCA info */
 746
 747 static int ibmlana_getinfo(char *buf, int slot, void *d)
 748 {
 749         int len = 0, i;
 750         struct net_device *dev = (struct net_device *) d;
 751         ibmlana_priv *priv;
 752
 753         /* can't say anything about an uninitialized device... */
 754
 755         if (dev == NULL)
 756                 return len;
 757         priv = netdev_priv(dev);
 758
 759         /* print info */
 760
 761         len += sprintf(buf + len, "IRQ: %d\n", priv->realirq);
 762         len += sprintf(buf + len, "I/O: %#lx\n", dev->base_addr);
 763         len += sprintf(buf + len, "Memory: %#lx-%#lx\n", dev->mem_start, dev->mem_end - 1);
 764         len += sprintf(buf + len, "Transceiver: %s\n", MediaNames[priv->medium]);
 765         len += sprintf(buf + len, "Device: %s\n", dev->name);
 766         len += sprintf(buf + len, "MAC address:");
 767         for (i = 0; i < 6; i++)
 768                 len += sprintf(buf + len, " %02x", dev->dev_addr[i]);
 769         buf[len++] = '\n';
 770         buf[len] = 0;
 771
 772         return len;
 773 }
 774
 775 /* open driver.  Means also initialization and start of LANCE */
 776
 777 static int ibmlana_open(struct net_device *dev)
 778 {
 779         int result;
 780         ibmlana_priv *priv = netdev_priv(dev);
 781
 782         /* register resources - only necessary for IRQ */
 783
 784         result = request_irq(priv->realirq, irq_handler, IRQF_SHARED | IRQF_SAMPLE_RANDOM, dev->name, dev);
 785         if (result != 0) {
 786                 printk(KERN_ERR "%s: failed to register irq %d\n", dev->name, dev->irq);
 787                 return result;
 788         }
 789         dev->irq = priv->realirq;
 790
 791         /* set up the card and SONIC */
 792         InitBoard(dev);
 793
 794         /* initialize operational flags */
 795         netif_start_queue(dev);
 796         return 0;
 797 }
 798
 799 /* close driver.  Shut down board and free allocated resources */
 800
 801 static int ibmlana_close(struct net_device *dev)
 802 {
 803         /* turn off board */
 804
 805         /* release resources */
 806         if (dev->irq != 0)
 807                 free_irq(dev->irq, dev);
 808         dev->irq = 0;
 809         return 0;
 810 }
 811
 812 /* transmit a block. */
 813
 814 static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
 815 {
 816         ibmlana_priv *priv = netdev_priv(dev);
 817         int retval = 0, tmplen, addr;
 818         unsigned long flags;
 819         tda_t tda;
 820         int baddr;
 821
 822         /* find out if there are free slots for a frame to transmit. If not,
 823            the upper layer is in deep desperation and we simply ignore the frame. */
 824
 825         if (priv->txusedcnt >= TXBUFCNT) {
 826                 retval = -EIO;
 827                 priv->stat.tx_dropped++;
 828                 goto tx_done;
 829         }
 830
 831         /* copy the frame data into the next free transmit buffer - fillup missing */
 832         tmplen = skb->len;
 833         if (tmplen < 60)
 834                 tmplen = 60;
 835         baddr = priv->txbufstart + (priv->nexttxdescr * PKTSIZE);
 836         memcpy_toio(priv->base + baddr, skb->data, skb->len);
 837
 838         /* copy filler into RAM - in case we're filling up...
 839            we're filling a bit more than necessary, but that doesn't harm
 840            since the buffer is far larger...
 841            Sorry Linus for the filler string but I couldn't resist ;-) */
 842
 843         if (tmplen > skb->len) {
 844                 char *fill = "NetBSD is a nice OS too! ";
 845                 unsigned int destoffs = skb->len, l = strlen(fill);
 846
 847                 while (destoffs < tmplen) {
 848                         memcpy_toio(priv->base + baddr + destoffs, fill, l);
 849                         destoffs += l;
 850                 }
 851         }
 852
 853         /* set up the new frame descriptor */
 854         addr = priv->tdastart + (priv->nexttxdescr * sizeof(tda_t));
 855         memcpy_fromio(&tda, priv->base + addr, sizeof(tda_t));
 856         tda.length = tda.fraglength = tmplen;
 857         memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));
 858
 859         /* if there were no active descriptors, trigger the SONIC */
 860         spin_lock_irqsave(&priv->lock, flags);
 861
 862         priv->txusedcnt++;
 863         priv->txused[priv->nexttxdescr] = 1;
 864
 865         /* are all transmission slots used up ? */
 866         if (priv->txusedcnt >= TXBUFCNT)
 867                 netif_stop_queue(dev);
 868
 869         if (priv->txusedcnt == 1)
 870                 StartTx(dev, priv->nexttxdescr);
 871         priv->nexttxdescr = (priv->nexttxdescr + 1) % TXBUFCNT;
 872
 873         spin_unlock_irqrestore(&priv->lock, flags);
 874 tx_done:
 875         dev_kfree_skb(skb);
 876         return retval;
 877 }
 878
 879 /* return pointer to Ethernet statistics */
 880
 881 static struct net_device_stats *ibmlana_stats(struct net_device *dev)
 882 {
 883         ibmlana_priv *priv = netdev_priv(dev);
 884         return &priv->stat;
 885 }
 886
 887 /* switch receiver mode. */
 888
 889 static void ibmlana_set_multicast_list(struct net_device *dev)
 890 {
 891         /* first stop the SONIC... */
 892         StopSONIC(dev);
 893         /* ...then reinit it with the new flags */
 894         InitBoard(dev);
 895 }
 896
 897 /* ------------------------------------------------------------------------
 898  * hardware check
 899  * ------------------------------------------------------------------------ */
 900
 901 static int startslot;           /* counts through slots when probing multiple devices */
 902
 903 static int ibmlana_probe(struct net_device *dev)
 904 {
 905         int slot, z;
 906         int base = 0, irq = 0, iobase = 0, memlen = 0;
 907         ibmlana_priv *priv;
 908         ibmlana_medium medium;
 909
 910         SET_MODULE_OWNER(dev);
 911
 912         /* can't work without an MCA bus ;-) */
 913         if (MCA_bus == 0)
 914                 return -ENODEV;
 915
 916         base = dev->mem_start;
 917         irq = dev->irq;
 918
 919         for (slot = startslot; (slot = mca_find_adapter(IBM_LANA_ID, slot)) != -1; slot++) {
 920                 /* deduce card addresses */
 921                 getaddrs(slot, &base, &memlen, &iobase, &irq, &medium);
 922
 923                 /* slot already in use ? */
 924                 if (mca_is_adapter_used(slot))
 925                         continue;
 926                 /* were we looking for something different ? */
 927                 if (dev->irq && dev->irq != irq)
 928                         continue;
 929                 if (dev->mem_start && dev->mem_start != base)
 930                         continue;
 931                 /* found something that matches */
 932                 break;
 933         }
 934
 935         /* nothing found ? */
 936         if (slot == -1)
 937                 return (base != 0 || irq != 0) ? -ENXIO : -ENODEV;
 938
 939         /* announce success */
 940         printk(KERN_INFO "%s: IBM LAN Adapter/A found in slot %d\n", dev->name, slot + 1);
 941
 942         /* try to obtain I/O range */
 943         if (!request_region(iobase, IBM_LANA_IORANGE, DRV_NAME)) {
 944                 printk(KERN_ERR "%s: cannot allocate I/O range at %#x!\n", DRV_NAME, iobase);
 945                 startslot = slot + 1;
 946                 return -EBUSY;
 947         }
 948
 949         priv = netdev_priv(dev);
 950         priv->slot = slot;
 951         priv->realirq = irq;
 952         priv->medium = medium;
 953         spin_lock_init(&priv->lock);
 954
 955
 956         /* set base + irq for this device (irq not allocated so far) */
 957
 958         dev->irq = 0;
 959         dev->mem_start = base;
 960         dev->mem_end = base + memlen;
 961         dev->base_addr = iobase;
 962
 963         priv->base = ioremap(base, memlen);
 964         if (!priv->base) {
 965                 printk(KERN_ERR "%s: cannot remap memory!\n", DRV_NAME);
 966                 startslot = slot + 1;
 967                 release_region(iobase, IBM_LANA_IORANGE);
 968                 return -EBUSY;
 969         }
 970
 971         /* make procfs entries */
 972         mca_set_adapter_name(slot, "IBM LAN Adapter/A");
 973         mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmlana_getinfo, dev);
 974
 975         mca_mark_as_used(slot);
 976
 977         /* set methods */
 978
 979         dev->open = ibmlana_open;
 980         dev->stop = ibmlana_close;
 981         dev->hard_start_xmit = ibmlana_tx;
 982         dev->do_ioctl = NULL;
 983         dev->get_stats = ibmlana_stats;
 984         dev->set_multicast_list = ibmlana_set_multicast_list;
 985         dev->flags |= IFF_MULTICAST;
 986
 987         /* copy out MAC address */
 988
 989         for (z = 0; z < sizeof(dev->dev_addr); z++)
 990                 dev->dev_addr[z] = inb(dev->base_addr + MACADDRPROM + z);
 991
 992         /* print config */
 993
 994         printk(KERN_INFO "%s: IRQ %d, I/O %#lx, memory %#lx-%#lx, "
 995                "MAC address %02x:%02x:%02x:%02x:%02x:%02x.\n",
 996                dev->name, priv->realirq, dev->base_addr,
 997                dev->mem_start, dev->mem_end - 1,
 998                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
 999                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1000         printk(KERN_INFO "%s: %s medium\n", dev->name, MediaNames[priv->medium]);
1001
1002         /* reset board */
1003
1004         ResetBoard(dev);
1005
1006         /* next probe will start at next slot */
1007
1008         startslot = slot + 1;
1009
1010         return 0;
1011 }
1012
1013 /* ------------------------------------------------------------------------
1014  * modularization support
1015  * ------------------------------------------------------------------------ */
1016
1017 #ifdef MODULE
1018
1019 #define DEVMAX 5
1020
1021 static struct net_device *moddevs[DEVMAX];
1022 static int irq;
1023 static int io;
1024
1025 module_param(irq, int, 0);
1026 module_param(io, int, 0);
1027 MODULE_PARM_DESC(irq, "IBM LAN/A IRQ number");
1028 MODULE_PARM_DESC(io, "IBM LAN/A I/O base address");
1029 MODULE_LICENSE("GPL");
1030
1031 int init_module(void)
1032 {
1033         int z;
1034
1035         startslot = 0;
1036         for (z = 0; z < DEVMAX; z++) {
1037                 struct net_device *dev = alloc_etherdev(sizeof(ibmlana_priv));
1038                 if (!dev)
1039                         break;
1040                 dev->irq = irq;
1041                 dev->base_addr = io;
1042                 if (ibmlana_probe(dev)) {
1043                         free_netdev(dev);
1044                         break;
1045                 }
1046                 if (register_netdev(dev)) {
1047                         ibmlana_priv *priv = netdev_priv(dev);
1048                         release_region(dev->base_addr, IBM_LANA_IORANGE);
1049                         mca_mark_as_unused(priv->slot);
1050                         mca_set_adapter_name(priv->slot, "");
1051                         mca_set_adapter_procfn(priv->slot, NULL, NULL);
1052                         iounmap(priv->base);
1053                         free_netdev(dev);
1054                         break;
1055                 }
1056                 moddevs[z] = dev;
1057         }
1058         return (z > 0) ? 0 : -EIO;
1059 }
1060
1061 void cleanup_module(void)
1062 {
1063         int z;
1064         for (z = 0; z < DEVMAX; z++) {
1065                 struct net_device *dev = moddevs[z];
1066                 if (dev) {
1067                         ibmlana_priv *priv = netdev_priv(dev);
1068                         unregister_netdev(dev);
1069                         /*DeinitBoard(dev); */
1070                         release_region(dev->base_addr, IBM_LANA_IORANGE);
1071                         mca_mark_as_unused(priv->slot);
1072                         mca_set_adapter_name(priv->slot, "");
1073                         mca_set_adapter_procfn(priv->slot, NULL, NULL);
1074                         iounmap(priv->base);
1075                         free_netdev(dev);
1076                 }
1077         }
1078 }
1079 #endif                          /* MODULE */