drivers/net/arm/ether3.c

   1 /*
   2  *  linux/drivers/acorn/net/ether3.c
   3  *
   4  *  Copyright (C) 1995-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
  11  *  for Acorn machines
  12  *
  13  * By Russell King, with some suggestions from borris@ant.co.uk
  14  *
  15  * Changelog:
  16  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
  17  *                              address up to the higher levels - they're
  18  *                              silently ignored.  I/F can now be put into
  19  *                              multicast mode.  Receiver routine optimised.
  20  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
  21  *                              the kernel rather than when a module.
  22  * 1.06 RMK     02/03/1996      Various code cleanups
  23  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
  24  *                              routines.
  25  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
  26  *                              prevented the kernel message about dropped
  27  *                              packets appearing too many times a second.
  28  *                              Now does not disable all IRQs, only the IRQ
  29  *                              used by this card.
  30  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
  31  *                              but we still service the TX queue if we get a
  32  *                              RX interrupt.
  33  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
  34  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
  35  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
  36  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
  37  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
  38  *                              Chip seems to have a bug in, whereby if the
  39  *                              packet starts two bytes from the end of the
  40  *                              buffer, it corrupts the receiver chain, and
  41  *                              never updates the transmit status correctly.
  42  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
  43  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
  44  *                              hardware.
  45  * 1.16 RMK     10/02/2000      Updated for 2.3.43
  46  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
  47  */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/sched.h>
  52 #include <linux/types.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/ptrace.h>
  56 #include <linux/ioport.h>
  57 #include <linux/in.h>
  58 #include <linux/slab.h>
  59 #include <linux/string.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/etherdevice.h>
  63 #include <linux/skbuff.h>
  64 #include <linux/device.h>
  65 #include <linux/init.h>
  66 #include <linux/delay.h>
  67
  68 #include <asm/system.h>
  69 #include <asm/bitops.h>
  70 #include <asm/ecard.h>
  71 #include <asm/io.h>
  72 #include <asm/irq.h>
  73
  74 static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  75
  76 #include "ether3.h"
  77
  78 static unsigned int net_debug = NET_DEBUG;
  79
  80 static void     ether3_setmulticastlist(struct net_device *dev);
  81 static int      ether3_rx(struct net_device *dev, struct dev_priv *priv, unsigned int maxcnt);
  82 static void     ether3_tx(struct net_device *dev, struct dev_priv *priv);
  83 static int      ether3_open (struct net_device *dev);
  84 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  85 static irqreturn_t ether3_interrupt (int irq, void *dev_id, struct pt_regs *regs);
  86 static int      ether3_close (struct net_device *dev);
  87 static struct net_device_stats *ether3_getstats (struct net_device *dev);
  88 static void     ether3_setmulticastlist (struct net_device *dev);
  89 static void     ether3_timeout(struct net_device *dev);
  90
  91 #define BUS_16          2
  92 #define BUS_8           1
  93 #define BUS_UNKNOWN     0
  94
  95 /* --------------------------------------------------------------------------- */
  96
  97 typedef enum {
  98         buffer_write,
  99         buffer_read
 100 } buffer_rw_t;
 101
 102 /*
 103  * ether3 read/write.  Slow things down a bit...
 104  * The SEEQ8005 doesn't like us writing to its registers
 105  * too quickly.
 106  */
 107 static inline void ether3_outb(int v, const int r)
 108 {
 109         outb(v, r);
 110         udelay(1);
 111 }
 112
 113 static inline void ether3_outw(int v, const int r)
 114 {
 115         outw(v, r);
 116         udelay(1);
 117 }
 118 #define ether3_inb(r)           ({ unsigned int __v = inb((r)); udelay(1); __v; })
 119 #define ether3_inw(r)           ({ unsigned int __v = inw((r)); udelay(1); __v; })
 120
 121 static int
 122 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 123 {
 124         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 125         int timeout = 1000;
 126
 127         ether3_outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 128         ether3_outw(priv->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 129
 130         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 131                 if (!timeout--) {
 132                         printk("%s: setbuffer broken\n", dev->name);
 133                         priv->broken = 1;
 134                         return 1;
 135                 }
 136                 udelay(1);
 137         }
 138
 139         if (read == buffer_read) {
 140                 ether3_outw(start, REG_DMAADDR);
 141                 ether3_outw(priv->regs.command | CMD_FIFOREAD, REG_COMMAND);
 142         } else {
 143                 ether3_outw(priv->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 144                 ether3_outw(start, REG_DMAADDR);
 145         }
 146         return 0;
 147 }
 148
 149 /*
 150  * write data to the buffer memory
 151  */
 152 #define ether3_writebuffer(dev,data,length)                     \
 153         outsw(REG_BUFWIN, (data), (length) >> 1)
 154
 155 #define ether3_writeword(dev,data)                              \
 156         outw((data), REG_BUFWIN)
 157
 158 #define ether3_writelong(dev,data)      {                       \
 159         unsigned long reg_bufwin = REG_BUFWIN;                  \
 160         outw((data), reg_bufwin);                               \
 161         outw((data) >> 16, reg_bufwin);                         \
 162 }
 163
 164 /*
 165  * read data from the buffer memory
 166  */
 167 #define ether3_readbuffer(dev,data,length)                      \
 168         insw(REG_BUFWIN, (data), (length) >> 1)
 169
 170 #define ether3_readword(dev)                                    \
 171         inw(REG_BUFWIN)
 172
 173 #define ether3_readlong(dev)                                    \
 174         inw(REG_BUFWIN) | (inw(REG_BUFWIN) << 16)
 175
 176 /*
 177  * Switch LED off...
 178  */
 179 static void
 180 ether3_ledoff(unsigned long data)
 181 {
 182         struct net_device *dev = (struct net_device *)data;
 183         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 184         ether3_outw(priv->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 185 }
 186
 187 /*
 188  * switch LED on...
 189  */
 190 static inline void
 191 ether3_ledon(struct net_device *dev, struct dev_priv *priv)
 192 {
 193         del_timer(&priv->timer);
 194         priv->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 195         priv->timer.data = (unsigned long)dev;
 196         priv->timer.function = ether3_ledoff;
 197         add_timer(&priv->timer);
 198         if (priv->regs.config2 & CFG2_CTRLO)
 199                 ether3_outw(priv->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 200 }
 201
 202 /*
 203  * Read the ethernet address string from the on board rom.
 204  * This is an ascii string!!!
 205  */
 206 static int __init
 207 ether3_addr(char *addr, struct expansion_card *ec)
 208 {
 209         struct in_chunk_dir cd;
 210         char *s;
 211
 212         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 213                 int i;
 214                 for (i = 0; i<6; i++) {
 215                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 216                         if (*s != (i==5?')' : ':' ))
 217                                 break;
 218                 }
 219                 if (i == 6)
 220                         return 0;
 221         }
 222         /* I wonder if we should even let the user continue in this case
 223          *   - no, it would be better to disable the device
 224          */
 225         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 226         return -ENODEV;
 227 }
 228
 229 /* --------------------------------------------------------------------------- */
 230
 231 static int __init
 232 ether3_ramtest(struct net_device *dev, unsigned char byte)
 233 {
 234         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 235         int i,ret = 0;
 236         int max_errors = 4;
 237         int bad = -1;
 238
 239         if (!buffer)
 240                 return 1;
 241
 242         memset(buffer, byte, RX_END);
 243         ether3_setbuffer(dev, buffer_write, 0);
 244         ether3_writebuffer(dev, buffer, TX_END);
 245         ether3_setbuffer(dev, buffer_write, RX_START);
 246         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 247         memset(buffer, byte ^ 0xff, RX_END);
 248         ether3_setbuffer(dev, buffer_read, 0);
 249         ether3_readbuffer(dev, buffer, TX_END);
 250         ether3_setbuffer(dev, buffer_read, RX_START);
 251         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 252
 253         for (i = 0; i < RX_END; i++) {
 254                 if (buffer[i] != byte) {
 255                         if (max_errors > 0 && bad != buffer[i]) {
 256                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 257                                        dev->name, buffer[i], byte, i);
 258                                 ret = 2;
 259                                 max_errors--;
 260                                 bad = i;
 261                         }
 262                 } else {
 263                         if (bad != -1) {
 264                                 if (bad != i - 1)
 265                                         printk(" - 0x%04X\n", i - 1);
 266                                 printk("\n");
 267                                 bad = -1;
 268                         }
 269                 }
 270         }
 271         if (bad != -1)
 272                 printk(" - 0xffff\n");
 273         kfree(buffer);
 274
 275         return ret;
 276 }
 277
 278 /* ------------------------------------------------------------------------------- */
 279
 280 static int __init
 281 ether3_init_2(struct net_device *dev)
 282 {
 283         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 284         int i;
 285
 286         priv->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 287         priv->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 288         priv->regs.command = 0;
 289
 290         /*
 291          * Set up our hardware address
 292          */
 293         ether3_outw(priv->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 294         for (i = 0; i < 6; i++)
 295                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 296
 297         if (dev->flags & IFF_PROMISC)
 298                 priv->regs.config1 |= CFG1_RECVPROMISC;
 299         else if (dev->flags & IFF_MULTICAST)
 300                 priv->regs.config1 |= CFG1_RECVSPECBRMULTI;
 301         else
 302                 priv->regs.config1 |= CFG1_RECVSPECBROAD;
 303
 304         /*
 305          * There is a problem with the NQ8005 in that it occasionally loses the
 306          * last two bytes.  To get round this problem, we receive the CRC as
 307          * well.  That way, if we do lose the last two, then it doesn't matter.
 308          */
 309         ether3_outw(priv->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 310         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 311         ether3_outw(priv->rx_head, REG_RECVPTR);
 312         ether3_outw(0, REG_TRANSMITPTR);
 313         ether3_outw(priv->rx_head >> 8, REG_RECVEND);
 314         ether3_outw(priv->regs.config2, REG_CONFIG2);
 315         ether3_outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 316         ether3_outw(priv->regs.command, REG_COMMAND);
 317
 318         i = ether3_ramtest(dev, 0x5A);
 319         if(i)
 320                 return i;
 321         i = ether3_ramtest(dev, 0x1E);
 322         if(i)
 323                 return i;
 324
 325         ether3_setbuffer(dev, buffer_write, 0);
 326         ether3_writelong(dev, 0);
 327         return 0;
 328 }
 329
 330 static void
 331 ether3_init_for_open(struct net_device *dev)
 332 {
 333         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 334         int i;
 335
 336         memset(&priv->stats, 0, sizeof(struct net_device_stats));
 337
 338         /* Reset the chip */
 339         ether3_outw(CFG2_RESET, REG_CONFIG2);
 340         udelay(4);
 341
 342         priv->regs.command = 0;
 343         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 344         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON));
 345
 346         ether3_outw(priv->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 347         for (i = 0; i < 6; i++)
 348                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 349
 350         priv->tx_head   = 0;
 351         priv->tx_tail   = 0;
 352         priv->regs.config2 |= CFG2_CTRLO;
 353         priv->rx_head   = RX_START;
 354
 355         ether3_outw(priv->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 356         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 357         ether3_outw(priv->rx_head, REG_RECVPTR);
 358         ether3_outw(priv->rx_head >> 8, REG_RECVEND);
 359         ether3_outw(0, REG_TRANSMITPTR);
 360         ether3_outw(priv->regs.config2, REG_CONFIG2);
 361         ether3_outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 362
 363         ether3_setbuffer(dev, buffer_write, 0);
 364         ether3_writelong(dev, 0);
 365
 366         priv->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 367         ether3_outw(priv->regs.command | CMD_RXON, REG_COMMAND);
 368 }
 369
 370 static inline int
 371 ether3_probe_bus_8(struct net_device *dev, int val)
 372 {
 373         int write_low, write_high, read_low, read_high;
 374
 375         write_low = val & 255;
 376         write_high = val >> 8;
 377
 378         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 379
 380         ether3_outb(write_low, REG_RECVPTR);
 381         ether3_outb(write_high, REG_RECVPTR + 1);
 382
 383         read_low = ether3_inb(REG_RECVPTR);
 384         read_high = ether3_inb(REG_RECVPTR + 1);
 385
 386         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 387
 388         return read_low == write_low && read_high == write_high;
 389 }
 390
 391 static inline int
 392 ether3_probe_bus_16(struct net_device *dev, int val)
 393 {
 394         int read_val;
 395
 396         ether3_outw(val, REG_RECVPTR);
 397         read_val = ether3_inw(REG_RECVPTR);
 398
 399         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 400
 401         return read_val == val;
 402 }
 403
 404 /*
 405  * Open/initialize the board.  This is called (in the current kernel)
 406  * sometime after booting when the 'ifconfig' program is run.
 407  *
 408  * This routine should set everything up anew at each open, even
 409  * registers that "should" only need to be set once at boot, so that
 410  * there is non-reboot way to recover if something goes wrong.
 411  */
 412 static int
 413 ether3_open(struct net_device *dev)
 414 {
 415         if (!is_valid_ether_addr(dev->dev_addr)) {
 416                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 417                         dev->name);
 418                 return -EINVAL;
 419         }
 420
 421         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 422                 return -EAGAIN;
 423
 424         ether3_init_for_open(dev);
 425
 426         netif_start_queue(dev);
 427
 428         return 0;
 429 }
 430
 431 /*
 432  * The inverse routine to ether3_open().
 433  */
 434 static int
 435 ether3_close(struct net_device *dev)
 436 {
 437         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 438
 439         netif_stop_queue(dev);
 440
 441         disable_irq(dev->irq);
 442
 443         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 444         priv->regs.command = 0;
 445         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON));
 446         ether3_outb(0x80, REG_CONFIG2 + 1);
 447         ether3_outw(0, REG_COMMAND);
 448
 449         free_irq(dev->irq, dev);
 450
 451         return 0;
 452 }
 453
 454 /*
 455  * Get the current statistics.  This may be called with the card open or
 456  * closed.
 457  */
 458 static struct net_device_stats *ether3_getstats(struct net_device *dev)
 459 {
 460         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 461         return &priv->stats;
 462 }
 463
 464 /*
 465  * Set or clear promiscuous/multicast mode filter for this adaptor.
 466  *
 467  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 468  * in which does not have the other ethernet address registers present...
 469  */
 470 static void ether3_setmulticastlist(struct net_device *dev)
 471 {
 472         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 473
 474         priv->regs.config1 &= ~CFG1_RECVPROMISC;
 475
 476         if (dev->flags & IFF_PROMISC) {
 477                 /* promiscuous mode */
 478                 priv->regs.config1 |= CFG1_RECVPROMISC;
 479         } else if (dev->flags & IFF_ALLMULTI) {
 480                 priv->regs.config1 |= CFG1_RECVSPECBRMULTI;
 481         } else
 482                 priv->regs.config1 |= CFG1_RECVSPECBROAD;
 483
 484         ether3_outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 485 }
 486
 487 static void
 488 ether3_timeout(struct net_device *dev)
 489 {
 490         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 491         unsigned long flags;
 492
 493         del_timer(&priv->timer);
 494
 495         local_irq_save(flags);
 496         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 497         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 498                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 499         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 500                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 501         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 502                 priv->tx_head, priv->tx_tail);
 503         ether3_setbuffer(dev, buffer_read, priv->tx_tail);
 504         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 505         local_irq_restore(flags);
 506
 507         priv->regs.config2 |= CFG2_CTRLO;
 508         priv->stats.tx_errors += 1;
 509         ether3_outw(priv->regs.config2, REG_CONFIG2);
 510         priv->tx_head = priv->tx_tail = 0;
 511
 512         netif_wake_queue(dev);
 513 }
 514
 515 /*
 516  * Transmit a packet
 517  */
 518 static int
 519 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 520 {
 521         struct dev_priv *priv = (struct dev_priv *)dev->priv;
 522         unsigned long flags;
 523         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 524         unsigned int ptr, next_ptr;
 525
 526         length = (length + 1) & ~1;
 527
 528         if (priv->broken) {
 529                 dev_kfree_skb(skb);
 530                 priv->stats.tx_dropped ++;
 531                 netif_start_queue(dev);
 532                 return 0;
 533         }
 534
 535         next_ptr = (priv->tx_head + 1) & 15;
 536
 537         local_irq_save(flags);
 538
 539         if (priv->tx_tail == next_ptr) {
 540                 local_irq_restore(flags);
 541                 return 1;       /* unable to queue */
 542         }
 543
 544         dev->trans_start = jiffies;
 545         ptr              = 0x600 * priv->tx_head;
 546         priv->tx_head    = next_ptr;
 547         next_ptr        *= 0x600;
 548
 549 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 550
 551         ether3_setbuffer(dev, buffer_write, next_ptr);
 552         ether3_writelong(dev, 0);
 553         ether3_setbuffer(dev, buffer_write, ptr);
 554         ether3_writelong(dev, 0);
 555         ether3_writebuffer(dev, skb->data, length);
 556         ether3_writeword(dev, htons(next_ptr));
 557         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 558         ether3_setbuffer(dev, buffer_write, ptr);
 559         ether3_writeword(dev, htons((ptr + length + 4)));
 560         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 561         ether3_ledon(dev, priv);
 562
 563         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 564                 ether3_outw(ptr, REG_TRANSMITPTR);
 565                 ether3_outw(priv->regs.command | CMD_TXON, REG_COMMAND);
 566         }
 567
 568         next_ptr = (priv->tx_head + 1) & 15;
 569         local_irq_restore(flags);
 570
 571         dev_kfree_skb(skb);
 572
 573         if (priv->tx_tail == next_ptr)
 574                 netif_stop_queue(dev);
 575
 576         return 0;
 577 }
 578
 579 static irqreturn_t
 580 ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 581 {
 582         struct net_device *dev = (struct net_device *)dev_id;
 583         struct dev_priv *priv;
 584         unsigned int status, handled = IRQ_NONE;
 585
 586 #if NET_DEBUG > 1
 587         if(net_debug & DEBUG_INT)
 588                 printk("eth3irq: %d ", irq);
 589 #endif
 590
 591         priv = (struct dev_priv *)dev->priv;
 592
 593         status = ether3_inw(REG_STATUS);
 594
 595         if (status & STAT_INTRX) {
 596                 ether3_outw(CMD_ACKINTRX | priv->regs.command, REG_COMMAND);
 597                 ether3_rx(dev, priv, 12);
 598                 handled = IRQ_HANDLED;
 599         }
 600
 601         if (status & STAT_INTTX) {
 602                 ether3_outw(CMD_ACKINTTX | priv->regs.command, REG_COMMAND);
 603                 ether3_tx(dev, priv);
 604                 handled = IRQ_HANDLED;
 605         }
 606
 607 #if NET_DEBUG > 1
 608         if(net_debug & DEBUG_INT)
 609                 printk("done\n");
 610 #endif
 611         return handled;
 612 }
 613
 614 /*
 615  * If we have a good packet(s), get it/them out of the buffers.
 616  */
 617 static int
 618 ether3_rx(struct net_device *dev, struct dev_priv *priv, unsigned int maxcnt)
 619 {
 620         unsigned int next_ptr = priv->rx_head, received = 0;
 621         ether3_ledon(dev, priv);
 622
 623         do {
 624                 unsigned int this_ptr, status;
 625                 unsigned char addrs[16];
 626
 627                 /*
 628                  * read the first 16 bytes from the buffer.
 629                  * This contains the status bytes etc and ethernet addresses,
 630                  * and we also check the source ethernet address to see if
 631                  * it originated from us.
 632                  */
 633                 {
 634                         unsigned int temp_ptr;
 635                         ether3_setbuffer(dev, buffer_read, next_ptr);
 636                         temp_ptr = ether3_readword(dev);
 637                         status = ether3_readword(dev);
 638                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 639                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 640                                 break;
 641
 642                         this_ptr = next_ptr + 4;
 643                         next_ptr = ntohs(temp_ptr);
 644                 }
 645                 ether3_setbuffer(dev, buffer_read, this_ptr);
 646                 ether3_readbuffer(dev, addrs+2, 12);
 647
 648 if (next_ptr < RX_START || next_ptr >= RX_END) {
 649  int i;
 650  printk("%s: bad next pointer @%04X: ", dev->name, priv->rx_head);
 651  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 652  for (i = 2; i < 14; i++)
 653    printk("%02X ", addrs[i]);
 654  printk("\n");
 655  next_ptr = priv->rx_head;
 656  break;
 657 }
 658                 /*
 659                  * ignore our own packets...
 660                  */
 661                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 662                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 663                         maxcnt ++; /* compensate for loopedback packet */
 664                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 665                 } else
 666                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 667                         unsigned int length = next_ptr - this_ptr;
 668                         struct sk_buff *skb;
 669
 670                         if (next_ptr <= this_ptr)
 671                                 length += RX_END - RX_START;
 672
 673                         skb = dev_alloc_skb(length + 2);
 674                         if (skb) {
 675                                 unsigned char *buf;
 676
 677                                 skb->dev = dev;
 678                                 skb_reserve(skb, 2);
 679                                 buf = skb_put(skb, length);
 680                                 ether3_readbuffer(dev, buf + 12, length - 12);
 681                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 682                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 683                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 684                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 685                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 686                                 skb->protocol = eth_type_trans(skb, dev);
 687                                 netif_rx(skb);
 688                                 received ++;
 689                         } else
 690                                 goto dropping;
 691                 } else {
 692                         struct net_device_stats *stats = &priv->stats;
 693                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 694                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 695                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 696                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 697                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 698                         stats->rx_errors++;
 699                 }
 700         }
 701         while (-- maxcnt);
 702
 703 done:
 704         priv->stats.rx_packets += received;
 705         priv->rx_head = next_ptr;
 706         /*
 707          * If rx went off line, then that means that the buffer may be full.  We
 708          * have dropped at least one packet.
 709          */
 710         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 711                 priv->stats.rx_dropped ++;
 712                 ether3_outw(next_ptr, REG_RECVPTR);
 713                 ether3_outw(priv->regs.command | CMD_RXON, REG_COMMAND);
 714         }
 715
 716         return maxcnt;
 717
 718 dropping:{
 719         static unsigned long last_warned;
 720
 721         ether3_outw(next_ptr >> 8, REG_RECVEND);
 722         /*
 723          * Don't print this message too many times...
 724          */
 725         if (time_after(jiffies, last_warned + 10 * HZ)) {
 726                 last_warned = jiffies;
 727                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 728         }
 729         priv->stats.rx_dropped ++;
 730         goto done;
 731         }
 732 }
 733
 734 /*
 735  * Update stats for the transmitted packet(s)
 736  */
 737 static void
 738 ether3_tx(struct net_device *dev, struct dev_priv *priv)
 739 {
 740         unsigned int tx_tail = priv->tx_tail;
 741         int max_work = 14;
 742
 743         do {
 744                 unsigned long status;
 745
 746                 /*
 747                  * Read the packet header
 748                  */
 749                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 750                 status = ether3_readlong(dev);
 751
 752                 /*
 753                  * Check to see if this packet has been transmitted
 754                  */
 755                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 756                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 757                         break;
 758
 759                 /*
 760                  * Update errors
 761                  */
 762                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 763                         priv->stats.tx_packets++;
 764                 else {
 765                         priv->stats.tx_errors ++;
 766                         if (status & TXSTAT_16COLLISIONS) priv->stats.collisions += 16;
 767                         if (status & TXSTAT_BABBLED) priv->stats.tx_fifo_errors ++;
 768                 }
 769
 770                 tx_tail = (tx_tail + 1) & 15;
 771         } while (--max_work);
 772
 773         if (priv->tx_tail != tx_tail) {
 774                 priv->tx_tail = tx_tail;
 775                 netif_wake_queue(dev);
 776         }
 777 }
 778
 779 static void __init ether3_banner(void)
 780 {
 781         static unsigned version_printed = 0;
 782
 783         if (net_debug && version_printed++ == 0)
 784                 printk(KERN_INFO "%s", version);
 785 }
 786
 787 static const char * __init
 788 ether3_get_dev(struct net_device *dev, struct expansion_card *ec)
 789 {
 790         const char *name = "ether3";
 791
 792         dev->base_addr = ecard_address(ec, ECARD_MEMC, 0);
 793         dev->irq = ec->irq;
 794
 795         if (ec->cid.manufacturer == MANU_ANT &&
 796             ec->cid.product == PROD_ANT_ETHERB) {
 797                 dev->base_addr += 0x200;
 798                 name = "etherb";
 799         }
 800
 801         ec->irqaddr = (volatile unsigned char *)ioaddr(dev->base_addr);
 802         ec->irqmask = 0xf0;
 803
 804         ether3_addr(dev->dev_addr, ec);
 805
 806         return name;
 807 }
 808
 809 static int __devinit
 810 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 811 {
 812         struct net_device *dev;
 813         struct dev_priv *priv;
 814         const char *name;
 815         int i, bus_type, ret;
 816
 817         ether3_banner();
 818
 819         dev = init_etherdev(NULL, sizeof(struct dev_priv));
 820         if (!dev) {
 821                 ret = -ENOMEM;
 822                 goto out;
 823         }
 824
 825         SET_MODULE_OWNER(dev);
 826
 827         name = ether3_get_dev(dev, ec);
 828         if (!name) {
 829                 ret = -ENODEV;
 830                 goto free;
 831         }
 832
 833         /*
 834          * this will not fail - the nature of the bus ensures this
 835          */
 836         if (!request_region(dev->base_addr, 128, dev->name)) {
 837                 ret = -EBUSY;
 838                 goto free;
 839         }
 840
 841         priv = (struct dev_priv *) dev->priv;
 842         init_timer(&priv->timer);
 843
 844         /* Reset card...
 845          */
 846         ether3_outb(0x80, REG_CONFIG2 + 1);
 847         bus_type = BUS_UNKNOWN;
 848         udelay(4);
 849
 850         /* Test using Receive Pointer (16-bit register) to find out
 851          * how the ether3 is connected to the bus...
 852          */
 853         if (ether3_probe_bus_8(dev, 0x100) &&
 854             ether3_probe_bus_8(dev, 0x201))
 855                 bus_type = BUS_8;
 856
 857         if (bus_type == BUS_UNKNOWN &&
 858             ether3_probe_bus_16(dev, 0x101) &&
 859             ether3_probe_bus_16(dev, 0x201))
 860                 bus_type = BUS_16;
 861
 862         switch (bus_type) {
 863         case BUS_UNKNOWN:
 864                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 865                 ret = -ENODEV;
 866                 goto failed;
 867
 868         case BUS_8:
 869                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 870                         "8-bit card\n", dev->name, name);
 871                 ret = -ENODEV;
 872                 goto failed;
 873
 874         default:
 875                 break;
 876         }
 877
 878         printk("%s: %s in slot %d, ", dev->name, name, ec->slot_no);
 879         for (i = 0; i < 6; i++)
 880                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 881
 882         if (ether3_init_2(dev)) {
 883                 ret = -ENODEV;
 884                 goto failed;
 885         }
 886
 887         dev->open               = ether3_open;
 888         dev->stop               = ether3_close;
 889         dev->hard_start_xmit    = ether3_sendpacket;
 890         dev->get_stats          = ether3_getstats;
 891         dev->set_multicast_list = ether3_setmulticastlist;
 892         dev->tx_timeout         = ether3_timeout;
 893         dev->watchdog_timeo     = 5 * HZ / 100;
 894
 895         ecard_set_drvdata(ec, dev);
 896         return 0;
 897
 898 failed:
 899         release_region(dev->base_addr, 128);
 900 free:
 901         unregister_netdev(dev);
 902         kfree(dev);
 903 out:
 904         return ret;
 905 }
 906
 907 static void __devexit ether3_remove(struct expansion_card *ec)
 908 {
 909         struct net_device *dev = ecard_get_drvdata(ec);
 910
 911         ecard_set_drvdata(ec, NULL);
 912
 913         unregister_netdev(dev);
 914         release_region(dev->base_addr, 128);
 915         kfree(dev);
 916 }
 917
 918 static const struct ecard_id ether3_ids[] = {
 919         { MANU_ANT2, PROD_ANT_ETHER3 },
 920         { MANU_ANT,  PROD_ANT_ETHER3 },
 921         { MANU_ANT,  PROD_ANT_ETHERB },
 922         { 0xffff, 0xffff }
 923 };
 924
 925 static struct ecard_driver ether3_driver = {
 926         .probe          = ether3_probe,
 927         .remove         = __devexit_p(ether3_remove),
 928         .id_table       = ether3_ids,
 929         .drv = {
 930                 .name   = "ether3",
 931         },
 932 };
 933
 934 static int __init ether3_init(void)
 935 {
 936         return ecard_register_driver(&ether3_driver);
 937 }
 938
 939 static void __exit ether3_exit(void)
 940 {
 941         ecard_remove_driver(&ether3_driver);
 942 }
 943
 944 module_init(ether3_init);
 945 module_exit(ether3_exit);
 946
 947 MODULE_LICENSE("GPL");