drivers/net/am79c961a.c

   1 /*
   2  * linux/drivers/net/am79c961.c
   3  *
   4  * Derived from various things including skeleton.c
   5  *
   6  * Russell King 1995-2000.
   7  *
   8  * This is a special driver for the am79c961A Lance chip used in the
   9  * Intel (formally Digital Equipment Corp) EBSA110 platform.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/ioport.h>
  19 #include <linux/in.h>
  20 #include <linux/malloc.h>
  21 #include <linux/string.h>
  22 #include <linux/errno.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/delay.h>
  27 #include <linux/init.h>
  28
  29 #include <asm/system.h>
  30 #include <asm/bitops.h>
  31 #include <asm/irq.h>
  32 #include <asm/io.h>
  33 #include <asm/dma.h>
  34 #include <asm/ecard.h>
  35
  36 #define TX_BUFFERS 15
  37 #define RX_BUFFERS 25
  38
  39 #include "am79c961a.h"
  40
  41 static void am79c961_interrupt (int irq, void *dev_id, struct pt_regs *regs);
  42
  43 static unsigned int net_debug = NET_DEBUG;
  44
  45 static char *version = "am79c961 ethernet driver (c) 1995 R.M.King v0.02\n";
  46
  47 /* --------------------------------------------------------------------------- */
  48
  49 #ifdef __arm__
  50 static void
  51 write_rreg (unsigned long base, unsigned int reg, unsigned short val)
  52 {
  53         __asm__("str%?h %1, [%2]        @ NET_RAP
  54                 str%?h  %0, [%2, #-4]   @ NET_RDP
  55                 " : : "r" (val), "r" (reg), "r" (0xf0000464));
  56 }
  57
  58 static inline unsigned short
  59 read_rreg (unsigned int base_addr, unsigned int reg)
  60 {
  61         unsigned short v;
  62         __asm__("str%?h %1, [%2]        @ NET_RAP
  63                 ldr%?h  %0, [%2, #-4]   @ NET_RDP
  64                 " : "=r" (v): "r" (reg), "r" (0xf0000464));
  65         return v;
  66 }
  67
  68 static inline void
  69 write_ireg (unsigned long base, unsigned int reg, unsigned short val)
  70 {
  71         __asm__("str%?h %1, [%2]        @ NET_RAP
  72                 str%?h  %0, [%2, #8]    @ NET_IDP
  73                 " : : "r" (val), "r" (reg), "r" (0xf0000464));
  74 }
  75
  76 #define am_writeword(dev,off,val)\
  77         __asm__("str%?h %0, [%1]" : : \
  78                 "r" ((val) & 0xffff), "r" (0xe0000000 + ((off) << 1)));
  79
  80 static inline void
  81 am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
  82 {
  83         offset = 0xe0000000 + (offset << 1);
  84         length = (length + 1) & ~1;
  85         if ((int)buf & 2) {
  86                 __asm__ __volatile__("str%?h    %2, [%0], #4"
  87                  : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
  88                 buf += 2;
  89                 length -= 2;
  90         }
  91         while (length > 8) {
  92                 unsigned int tmp, tmp2;
  93                 __asm__ __volatile__("
  94                         ldm%?ia %1!, {%2, %3}
  95                         str%?h  %2, [%0], #4
  96                         mov%?   %2, %2, lsr #16
  97                         str%?h  %2, [%0], #4
  98                         str%?h  %3, [%0], #4
  99                         mov%?   %3, %3, lsr #16
 100                         str%?h  %3, [%0], #4
 101                 " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2)
 102                   : "0" (offset), "1" (buf));
 103                 length -= 8;
 104         }
 105         while (length > 0) {
 106                 __asm__ __volatile__("str%?h    %2, [%0], #4"
 107                  : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
 108                 buf += 2;
 109                 length -= 2;
 110         }
 111 }
 112
 113 /*
 114  * This reads a 16-bit quantity in little-endian
 115  * mode from the am79c961 buffer.
 116  */
 117 static inline unsigned short am_readword(struct net_device *dev, u_int off)
 118 {
 119         unsigned long address = 0xe0000000 + (off << 1);
 120         unsigned short val;
 121
 122         __asm__("ldr%?h %0, [%1]" : "=r" (val): "r" (address));
 123         return val;
 124 }
 125
 126 static inline void
 127 am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
 128 {
 129         offset = 0xe0000000 + (offset << 1);
 130         length = (length + 1) & ~1;
 131         if ((int)buf & 2) {
 132                 unsigned int tmp;
 133                 __asm__ __volatile__("
 134                         ldr%?h  %2, [%0], #4
 135                         str%?b  %2, [%1], #1
 136                         mov%?   %2, %2, lsr #8
 137                         str%?b  %2, [%1], #1
 138                 " : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
 139                 length -= 2;
 140         }
 141         while (length > 8) {
 142                 unsigned int tmp, tmp2, tmp3;
 143                 __asm__ __volatile__("
 144                         ldr%?h  %2, [%0], #4
 145                         ldr%?h  %3, [%0], #4
 146                         orr%?   %2, %2, %3, lsl #16
 147                         ldr%?h  %3, [%0], #4
 148                         ldr%?h  %4, [%0], #4
 149                         orr%?   %3, %3, %4, lsl #16
 150                         stm%?ia %1!, {%2, %3}
 151                 " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
 152                   : "0" (offset), "1" (buf));
 153                 length -= 8;
 154         }
 155         while (length > 0) {
 156                 unsigned int tmp;
 157                 __asm__ __volatile__("
 158                         ldr%?h  %2, [%0], #4
 159                         str%?b  %2, [%1], #1
 160                         mov%?   %2, %2, lsr #8
 161                         str%?b  %2, [%1], #1
 162                 " : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
 163                 length -= 2;
 164         }
 165 }
 166 #else
 167 #error Not compatable
 168 #endif
 169
 170 static int
 171 am79c961_ramtest(struct net_device *dev, unsigned int val)
 172 {
 173         unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
 174         int i, error = 0, errorcount = 0;
 175
 176         if (!buffer)
 177                 return 0;
 178         memset (buffer, val, 65536);
 179         am_writebuffer(dev, 0, buffer, 65536);
 180         memset (buffer, val ^ 255, 65536);
 181         am_readbuffer(dev, 0, buffer, 65536);
 182         for (i = 0; i < 65536; i++) {
 183                 if (buffer[i] != val && !error) {
 184                         printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
 185                         error = 1;
 186                         errorcount ++;
 187                 } else if (error && buffer[i] == val) {
 188                         printk ("%05X\n", i);
 189                         error = 0;
 190                 }
 191         }
 192         if (error)
 193                 printk ("10000\n");
 194         kfree (buffer);
 195         return errorcount;
 196 }
 197
 198 static void
 199 am79c961_init_for_open(struct net_device *dev)
 200 {
 201         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 202         unsigned long flags;
 203         unsigned char *p;
 204         u_int hdr_addr, first_free_addr;
 205         int i;
 206
 207         save_flags_cli (flags);
 208         write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
 209         restore_flags (flags);
 210
 211         write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
 212         write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
 213         write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
 214         write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
 215
 216         for (i = LADRL; i <= LADRH; i++)
 217                 write_rreg (dev->base_addr, i, 0);
 218
 219         for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
 220                 write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
 221
 222         i = MODE_PORT_10BT;
 223         if (dev->flags & IFF_PROMISC)
 224                 i |= MODE_PROMISC;
 225
 226         write_rreg (dev->base_addr, MODE, i);
 227         write_rreg (dev->base_addr, POLLINT, 0);
 228         write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
 229         write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
 230
 231         first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
 232         hdr_addr = 0;
 233
 234         priv->rxhead = 0;
 235         priv->rxtail = 0;
 236         priv->rxhdr = hdr_addr;
 237
 238         for (i = 0; i < RX_BUFFERS; i++) {
 239                 priv->rxbuffer[i] = first_free_addr;
 240                 am_writeword (dev, hdr_addr, first_free_addr);
 241                 am_writeword (dev, hdr_addr + 2, RMD_OWN);
 242                 am_writeword (dev, hdr_addr + 4, (-1600));
 243                 am_writeword (dev, hdr_addr + 6, 0);
 244                 first_free_addr += 1600;
 245                 hdr_addr += 8;
 246         }
 247         priv->txhead = 0;
 248         priv->txtail = 0;
 249         priv->txhdr = hdr_addr;
 250         for (i = 0; i < TX_BUFFERS; i++) {
 251                 priv->txbuffer[i] = first_free_addr;
 252                 am_writeword (dev, hdr_addr, first_free_addr);
 253                 am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
 254                 am_writeword (dev, hdr_addr + 4, 0xf000);
 255                 am_writeword (dev, hdr_addr + 6, 0);
 256                 first_free_addr += 1600;
 257                 hdr_addr += 8;
 258         }
 259
 260         write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
 261         write_rreg (dev->base_addr, BASERXH, 0);
 262         write_rreg (dev->base_addr, BASETXL, priv->txhdr);
 263         write_rreg (dev->base_addr, BASERXH, 0);
 264         write_rreg (dev->base_addr, CSR0, CSR0_STOP);
 265         write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
 266         write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
 267 }
 268
 269 /*
 270  * Open/initialize the board.  This is called (in the current kernel)
 271  * sometime after booting when the 'ifconfig' program is run.
 272  *
 273  * This routine should set everything up anew at each open, even
 274  * registers that "should" only need to be set once at boot, so that
 275  * there is non-reboot way to recover if something goes wrong.
 276  */
 277 static int
 278 am79c961_open(struct net_device *dev)
 279 {
 280         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 281
 282         MOD_INC_USE_COUNT;
 283
 284         memset (&priv->stats, 0, sizeof (priv->stats));
 285
 286         if (request_irq(dev->irq, am79c961_interrupt, 0, "am79c961", dev)) {
 287                 MOD_DEC_USE_COUNT;
 288                 return -EAGAIN;
 289         }
 290
 291         am79c961_init_for_open(dev);
 292
 293         netif_start_queue(dev);
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * The inverse routine to am79c961_open().
 300  */
 301 static int
 302 am79c961_close(struct net_device *dev)
 303 {
 304         unsigned long flags;
 305
 306         netif_stop_queue(dev);
 307
 308         save_flags_cli (flags);
 309
 310         write_rreg (dev->base_addr, CSR0, CSR0_STOP);
 311         write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
 312
 313         restore_flags (flags);
 314
 315         free_irq (dev->irq, dev);
 316
 317         MOD_DEC_USE_COUNT;
 318         return 0;
 319 }
 320
 321 /*
 322  * Get the current statistics.  This may be called with the card open or
 323  * closed.
 324  */
 325 static struct net_device_stats *am79c961_getstats (struct net_device *dev)
 326 {
 327         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 328         return &priv->stats;
 329 }
 330
 331 static inline u32 update_crc(u32 crc, u8 byte)
 332 {
 333         int i;
 334
 335         for (i = 8; i != 0; i--) {
 336                 byte ^= crc & 1;
 337                 crc >>= 1;
 338
 339                 if (byte & 1)
 340                         crc ^= 0xedb88320;
 341
 342                 byte >>= 1;
 343         }
 344
 345         return crc;
 346 }
 347
 348 static void am79c961_mc_hash(struct dev_mc_list *dmi, unsigned short *hash)
 349 {
 350         if (dmi->dmi_addrlen == ETH_ALEN && dmi->dmi_addr[0] & 0x01) {
 351                 int i, idx, bit;
 352                 u32 crc;
 353
 354                 crc = 0xffffffff;
 355
 356                 for (i = 0; i < ETH_ALEN; i++)
 357                         crc = update_crc(crc, dmi->dmi_addr[i]);
 358
 359                 idx = crc >> 30;
 360                 bit = (crc >> 26) & 15;
 361
 362                 hash[idx] |= 1 << bit;
 363         }
 364 }
 365
 366 /*
 367  * Set or clear promiscuous/multicast mode filter for this adaptor.
 368  */
 369 static void am79c961_setmulticastlist (struct net_device *dev)
 370 {
 371         unsigned long flags;
 372         unsigned short multi_hash[4], mode;
 373         int i, stopped;
 374
 375         mode = MODE_PORT_10BT;
 376
 377         if (dev->flags & IFF_PROMISC) {
 378                 mode |= MODE_PROMISC;
 379         } else if (dev->flags & IFF_ALLMULTI) {
 380                 memset(multi_hash, 0xff, sizeof(multi_hash));
 381         } else {
 382                 struct dev_mc_list *dmi;
 383
 384                 memset(multi_hash, 0x00, sizeof(multi_hash));
 385
 386                 for (dmi = dev->mc_list; dmi; dmi = dmi->next)
 387                         am79c961_mc_hash(dmi, multi_hash);
 388         }
 389
 390         save_flags_cli(flags);
 391
 392         stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
 393
 394         if (!stopped) {
 395                 /*
 396                  * Put the chip into suspend mode
 397                  */
 398                 write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
 399
 400                 /*
 401                  * Spin waiting for chip to report suspend mode
 402                  */
 403                 while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
 404                         restore_flags(flags);
 405                         nop();
 406                         save_flags_cli(flags);
 407                 }
 408         }
 409
 410         /*
 411          * Update the multicast hash table
 412          */
 413         for (i = 0; i < sizeof(multi_hash) / sizeof(multi_hash[0]); i++)
 414                 write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
 415
 416         /*
 417          * Write the mode register
 418          */
 419         write_rreg(dev->base_addr, MODE, mode);
 420
 421         if (!stopped) {
 422                 /*
 423                  * Put the chip back into running mode
 424                  */
 425                 write_rreg(dev->base_addr, CTRL1, 0);
 426         }
 427
 428         restore_flags(flags);
 429 }
 430
 431 static void am79c961_timeout(struct net_device *dev)
 432 {
 433         printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
 434                 dev->name);
 435
 436         /*
 437          * ought to do some setup of the tx side here
 438          */
 439
 440         netif_wake_queue(dev);
 441 }
 442
 443 /*
 444  * Transmit a packet
 445  */
 446 static int
 447 am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
 448 {
 449         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 450         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 451         unsigned int hdraddr, bufaddr;
 452         unsigned int head;
 453         unsigned long flags;
 454
 455         head = priv->txhead;
 456         hdraddr = priv->txhdr + (head << 3);
 457         bufaddr = priv->txbuffer[head];
 458         head += 1;
 459         if (head >= TX_BUFFERS)
 460                 head = 0;
 461
 462         am_writebuffer (dev, bufaddr, skb->data, length);
 463         am_writeword (dev, hdraddr + 4, -length);
 464         am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
 465         priv->txhead = head;
 466
 467         save_flags_cli (flags);
 468         write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
 469         dev->trans_start = jiffies;
 470         restore_flags (flags);
 471
 472         /*
 473          * If the next packet is owned by the ethernet device,
 474          * then the tx ring is full and we can't add another
 475          * packet.
 476          */
 477         if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN) {
 478                 printk(KERN_DEBUG"tx ring full, stopping queue\n");
 479                 netif_stop_queue(dev);
 480         }
 481
 482         dev_kfree_skb(skb);
 483
 484         return 0;
 485 }
 486
 487 /*
 488  * If we have a good packet(s), get it/them out of the buffers.
 489  */
 490 static void
 491 am79c961_rx(struct net_device *dev, struct dev_priv *priv)
 492 {
 493         do {
 494                 struct sk_buff *skb;
 495                 u_int hdraddr;
 496                 u_int pktaddr;
 497                 u_int status;
 498                 int len;
 499
 500                 hdraddr = priv->rxhdr + (priv->rxtail << 3);
 501                 pktaddr = priv->rxbuffer[priv->rxtail];
 502
 503                 status = am_readword (dev, hdraddr + 2);
 504                 if (status & RMD_OWN) /* do we own it? */
 505                         break;
 506
 507                 priv->rxtail ++;
 508                 if (priv->rxtail >= RX_BUFFERS)
 509                         priv->rxtail = 0;
 510
 511                 if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
 512                         am_writeword (dev, hdraddr + 2, RMD_OWN);
 513                         priv->stats.rx_errors ++;
 514                         if (status & RMD_ERR) {
 515                                 if (status & RMD_FRAM)
 516                                         priv->stats.rx_frame_errors ++;
 517                                 if (status & RMD_CRC)
 518                                         priv->stats.rx_crc_errors ++;
 519                         } else if (status & RMD_STP)
 520                                 priv->stats.rx_length_errors ++;
 521                         continue;
 522                 }
 523
 524                 len = am_readword(dev, hdraddr + 6);
 525                 skb = dev_alloc_skb(len + 2);
 526
 527                 if (skb) {
 528                         skb->dev = dev;
 529                         skb_reserve(skb, 2);
 530
 531                         am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
 532                         am_writeword(dev, hdraddr + 2, RMD_OWN);
 533                         skb->protocol = eth_type_trans(skb, dev);
 534                         netif_rx(skb);
 535                         dev->last_rx = jiffies;
 536                         priv->stats.rx_bytes += len;
 537                         priv->stats.rx_packets ++;
 538                 } else {
 539                         am_writeword (dev, hdraddr + 2, RMD_OWN);
 540                         printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
 541                         priv->stats.rx_dropped ++;
 542                         break;
 543                 }
 544         } while (1);
 545 }
 546
 547 /*
 548  * Update stats for the transmitted packet
 549  */
 550 static void
 551 am79c961_tx(struct net_device *dev, struct dev_priv *priv)
 552 {
 553         do {
 554                 u_int hdraddr;
 555                 u_int status;
 556 int bufnum;
 557
 558 bufnum = priv->txtail;
 559                 hdraddr = priv->txhdr + (priv->txtail << 3);
 560                 status = am_readword (dev, hdraddr + 2);
 561                 if (status & TMD_OWN)
 562                         break;
 563
 564                 priv->txtail ++;
 565                 if (priv->txtail >= TX_BUFFERS)
 566                         priv->txtail = 0;
 567
 568                 if (status & TMD_ERR) {
 569                         u_int status2;
 570
 571                         priv->stats.tx_errors ++;
 572
 573                         status2 = am_readword (dev, hdraddr + 6);
 574
 575                         /*
 576                          * Clear the error byte
 577                          */
 578                         am_writeword (dev, hdraddr + 6, 0);
 579
 580                         if (status2 & TST_RTRY)
 581                                 priv->stats.collisions += 16;
 582                         if (status2 & TST_LCOL)
 583                                 priv->stats.tx_window_errors ++;
 584                         if (status2 & TST_LCAR)
 585                                 priv->stats.tx_carrier_errors ++;
 586                         if (status2 & TST_UFLO)
 587                                 priv->stats.tx_fifo_errors ++;
 588                         continue;
 589                 }
 590                 priv->stats.tx_packets ++;
 591         } while (priv->txtail != priv->txhead);
 592
 593         netif_wake_queue(dev);
 594 }
 595
 596 static void
 597 am79c961_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 598 {
 599         struct net_device *dev = (struct net_device *)dev_id;
 600         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 601         u_int status;
 602
 603         status = read_rreg(dev->base_addr, CSR0);
 604         write_rreg(dev->base_addr, CSR0, status & (CSR0_TINT|CSR0_RINT|CSR0_MISS|CSR0_IENA));
 605
 606         if (status & CSR0_RINT)
 607                 am79c961_rx(dev, priv);
 608         if (status & CSR0_TINT)
 609                 am79c961_tx(dev, priv);
 610         if (status & CSR0_MISS)
 611                 priv->stats.rx_dropped ++;
 612 }
 613
 614 static int
 615 am79c961_hw_init(struct net_device *dev)
 616 {
 617         unsigned long flags;
 618
 619         am79c961_ramtest(dev, 0x66);
 620         am79c961_ramtest(dev, 0x99);
 621
 622         save_flags_cli (flags);
 623
 624         write_rreg (dev->base_addr, CSR0, CSR0_STOP);
 625         write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
 626
 627         restore_flags (flags);
 628
 629         return 0;
 630 }
 631
 632 static void __init am79c961_banner(void)
 633 {
 634         static unsigned version_printed = 0;
 635
 636         if (net_debug && version_printed++ == 0)
 637                 printk(KERN_INFO "%s", version);
 638 }
 639
 640 static int __init am79c961_init(void)
 641 {
 642         struct net_device *dev;
 643         struct dev_priv *priv;
 644         int i, ret;
 645
 646         dev = init_etherdev(NULL, sizeof(struct dev_priv));
 647         ret = -ENOMEM;
 648         if (!dev)
 649                 goto out;
 650
 651         priv = (struct dev_priv *) dev->priv;
 652
 653         /*
 654          * Fixed address and IRQ lines here.
 655          * The PNP initialisation should have been
 656          * done by the ether bootp loader.
 657          */
 658         dev->base_addr = 0x220;
 659         dev->irq = IRQ_EBSA110_ETHERNET;
 660
 661         /*
 662          * Reset the device.
 663          */
 664         inb((dev->base_addr + NET_RESET) >> 1);
 665         udelay(5);
 666
 667         /*
 668          * Check the manufacturer part of the
 669          * ether address.
 670          */
 671         ret = -ENODEV;
 672         if (inb(dev->base_addr >> 1) != 0x08 ||
 673             inb((dev->base_addr >> 1) + 1) != 00 ||
 674             inb((dev->base_addr >> 1) + 2) != 0x2b)
 675                 goto nodev;
 676
 677         if (!request_region(dev->base_addr, 0x18, dev->name))
 678                 goto nodev;
 679
 680         am79c961_banner();
 681         printk(KERN_INFO "%s: am79c961 found at %08lx, IRQ%d, ether address ",
 682                 dev->name, dev->base_addr, dev->irq);
 683
 684         /* Retrive and print the ethernet address. */
 685         for (i = 0; i < 6; i++) {
 686                 dev->dev_addr[i] = inb((dev->base_addr >> 1) + i) & 0xff;
 687                 printk (i == 5 ? "%02x\n" : "%02x:", dev->dev_addr[i]);
 688         }
 689
 690         if (am79c961_hw_init(dev))
 691                 goto release;
 692
 693         dev->open               = am79c961_open;
 694         dev->stop               = am79c961_close;
 695         dev->hard_start_xmit    = am79c961_sendpacket;
 696         dev->get_stats          = am79c961_getstats;
 697         dev->set_multicast_list = am79c961_setmulticastlist;
 698         dev->tx_timeout         = am79c961_timeout;
 699
 700         return 0;
 701
 702 release:
 703         release_region(dev->base_addr, 0x18);
 704 nodev:
 705         unregister_netdev(dev);
 706         kfree(dev);
 707 out:
 708         return ret;
 709 }
 710
 711 module_init(am79c961_init);