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/types.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/ptrace.h>
  55 #include <linux/ioport.h>
  56 #include <linux/in.h>
  57 #include <linux/slab.h>
  58 #include <linux/string.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include <linux/device.h>
  64 #include <linux/init.h>
  65 #include <linux/delay.h>
  66 #include <linux/bitops.h>
  67
  68 #include <asm/system.h>
  69 #include <asm/ecard.h>
  70 #include <asm/io.h>
  71
  72 static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  73
  74 #include "ether3.h"
  75
  76 static unsigned int net_debug = NET_DEBUG;
  77
  78 static void     ether3_setmulticastlist(struct net_device *dev);
  79 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  80 static void     ether3_tx(struct net_device *dev);
  81 static int      ether3_open (struct net_device *dev);
  82 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  83 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  84 static int      ether3_close (struct net_device *dev);
  85 static struct net_device_stats *ether3_getstats (struct net_device *dev);
  86 static void     ether3_setmulticastlist (struct net_device *dev);
  87 static void     ether3_timeout(struct net_device *dev);
  88
  89 #define BUS_16          2
  90 #define BUS_8           1
  91 #define BUS_UNKNOWN     0
  92
  93 /* --------------------------------------------------------------------------- */
  94
  95 typedef enum {
  96         buffer_write,
  97         buffer_read
  98 } buffer_rw_t;
  99
 100 /*
 101  * ether3 read/write.  Slow things down a bit...
 102  * The SEEQ8005 doesn't like us writing to its registers
 103  * too quickly.
 104  */
 105 static inline void ether3_outb(int v, const void __iomem *r)
 106 {
 107         writeb(v, r);
 108         udelay(1);
 109 }
 110
 111 static inline void ether3_outw(int v, const void __iomem *r)
 112 {
 113         writew(v, r);
 114         udelay(1);
 115 }
 116 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 117 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 118
 119 static int
 120 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 121 {
 122         int timeout = 1000;
 123
 124         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 125         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 126
 127         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 128                 if (!timeout--) {
 129                         printk("%s: setbuffer broken\n", dev->name);
 130                         priv(dev)->broken = 1;
 131                         return 1;
 132                 }
 133                 udelay(1);
 134         }
 135
 136         if (read == buffer_read) {
 137                 ether3_outw(start, REG_DMAADDR);
 138                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 139         } else {
 140                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 141                 ether3_outw(start, REG_DMAADDR);
 142         }
 143         return 0;
 144 }
 145
 146 /*
 147  * write data to the buffer memory
 148  */
 149 #define ether3_writebuffer(dev,data,length)                     \
 150         writesw(REG_BUFWIN, (data), (length) >> 1)
 151
 152 #define ether3_writeword(dev,data)                              \
 153         writew((data), REG_BUFWIN)
 154
 155 #define ether3_writelong(dev,data)      {                       \
 156         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 157         writew((data), reg_bufwin);                             \
 158         writew((data) >> 16, reg_bufwin);                       \
 159 }
 160
 161 /*
 162  * read data from the buffer memory
 163  */
 164 #define ether3_readbuffer(dev,data,length)                      \
 165         readsw(REG_BUFWIN, (data), (length) >> 1)
 166
 167 #define ether3_readword(dev)                                    \
 168         readw(REG_BUFWIN)
 169
 170 #define ether3_readlong(dev)                                    \
 171         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 172
 173 /*
 174  * Switch LED off...
 175  */
 176 static void ether3_ledoff(unsigned long data)
 177 {
 178         struct net_device *dev = (struct net_device *)data;
 179         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 180 }
 181
 182 /*
 183  * switch LED on...
 184  */
 185 static inline void ether3_ledon(struct net_device *dev)
 186 {
 187         del_timer(&priv(dev)->timer);
 188         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 189         priv(dev)->timer.data = (unsigned long)dev;
 190         priv(dev)->timer.function = ether3_ledoff;
 191         add_timer(&priv(dev)->timer);
 192         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 193                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 194 }
 195
 196 /*
 197  * Read the ethernet address string from the on board rom.
 198  * This is an ascii string!!!
 199  */
 200 static int __devinit
 201 ether3_addr(char *addr, struct expansion_card *ec)
 202 {
 203         struct in_chunk_dir cd;
 204         char *s;
 205
 206         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 207                 int i;
 208                 for (i = 0; i<6; i++) {
 209                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 210                         if (*s != (i==5?')' : ':' ))
 211                                 break;
 212                 }
 213                 if (i == 6)
 214                         return 0;
 215         }
 216         /* I wonder if we should even let the user continue in this case
 217          *   - no, it would be better to disable the device
 218          */
 219         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 220         return -ENODEV;
 221 }
 222
 223 /* --------------------------------------------------------------------------- */
 224
 225 static int __devinit
 226 ether3_ramtest(struct net_device *dev, unsigned char byte)
 227 {
 228         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 229         int i,ret = 0;
 230         int max_errors = 4;
 231         int bad = -1;
 232
 233         if (!buffer)
 234                 return 1;
 235
 236         memset(buffer, byte, RX_END);
 237         ether3_setbuffer(dev, buffer_write, 0);
 238         ether3_writebuffer(dev, buffer, TX_END);
 239         ether3_setbuffer(dev, buffer_write, RX_START);
 240         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 241         memset(buffer, byte ^ 0xff, RX_END);
 242         ether3_setbuffer(dev, buffer_read, 0);
 243         ether3_readbuffer(dev, buffer, TX_END);
 244         ether3_setbuffer(dev, buffer_read, RX_START);
 245         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 246
 247         for (i = 0; i < RX_END; i++) {
 248                 if (buffer[i] != byte) {
 249                         if (max_errors > 0 && bad != buffer[i]) {
 250                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 251                                        dev->name, buffer[i], byte, i);
 252                                 ret = 2;
 253                                 max_errors--;
 254                                 bad = i;
 255                         }
 256                 } else {
 257                         if (bad != -1) {
 258                                 if (bad != i - 1)
 259                                         printk(" - 0x%04X\n", i - 1);
 260                                 printk("\n");
 261                                 bad = -1;
 262                         }
 263                 }
 264         }
 265         if (bad != -1)
 266                 printk(" - 0xffff\n");
 267         kfree(buffer);
 268
 269         return ret;
 270 }
 271
 272 /* ------------------------------------------------------------------------------- */
 273
 274 static int __devinit ether3_init_2(struct net_device *dev)
 275 {
 276         int i;
 277
 278         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 279         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 280         priv(dev)->regs.command = 0;
 281
 282         /*
 283          * Set up our hardware address
 284          */
 285         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 286         for (i = 0; i < 6; i++)
 287                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 288
 289         if (dev->flags & IFF_PROMISC)
 290                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 291         else if (dev->flags & IFF_MULTICAST)
 292                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 293         else
 294                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 295
 296         /*
 297          * There is a problem with the NQ8005 in that it occasionally loses the
 298          * last two bytes.  To get round this problem, we receive the CRC as
 299          * well.  That way, if we do lose the last two, then it doesn't matter.
 300          */
 301         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 302         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 303         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 304         ether3_outw(0, REG_TRANSMITPTR);
 305         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 306         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 307         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 308         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 309
 310         i = ether3_ramtest(dev, 0x5A);
 311         if(i)
 312                 return i;
 313         i = ether3_ramtest(dev, 0x1E);
 314         if(i)
 315                 return i;
 316
 317         ether3_setbuffer(dev, buffer_write, 0);
 318         ether3_writelong(dev, 0);
 319         return 0;
 320 }
 321
 322 static void
 323 ether3_init_for_open(struct net_device *dev)
 324 {
 325         int i;
 326
 327         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
 328
 329         /* Reset the chip */
 330         ether3_outw(CFG2_RESET, REG_CONFIG2);
 331         udelay(4);
 332
 333         priv(dev)->regs.command = 0;
 334         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 335         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 336                 barrier();
 337
 338         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 339         for (i = 0; i < 6; i++)
 340                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 341
 342         priv(dev)->tx_head      = 0;
 343         priv(dev)->tx_tail      = 0;
 344         priv(dev)->regs.config2 |= CFG2_CTRLO;
 345         priv(dev)->rx_head      = RX_START;
 346
 347         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 348         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 349         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 350         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 351         ether3_outw(0, REG_TRANSMITPTR);
 352         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 353         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 354
 355         ether3_setbuffer(dev, buffer_write, 0);
 356         ether3_writelong(dev, 0);
 357
 358         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 359         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 360 }
 361
 362 static inline int
 363 ether3_probe_bus_8(struct net_device *dev, int val)
 364 {
 365         int write_low, write_high, read_low, read_high;
 366
 367         write_low = val & 255;
 368         write_high = val >> 8;
 369
 370         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 371
 372         ether3_outb(write_low, REG_RECVPTR);
 373         ether3_outb(write_high, REG_RECVPTR + 4);
 374
 375         read_low = ether3_inb(REG_RECVPTR);
 376         read_high = ether3_inb(REG_RECVPTR + 4);
 377
 378         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 379
 380         return read_low == write_low && read_high == write_high;
 381 }
 382
 383 static inline int
 384 ether3_probe_bus_16(struct net_device *dev, int val)
 385 {
 386         int read_val;
 387
 388         ether3_outw(val, REG_RECVPTR);
 389         read_val = ether3_inw(REG_RECVPTR);
 390
 391         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 392
 393         return read_val == val;
 394 }
 395
 396 /*
 397  * Open/initialize the board.  This is called (in the current kernel)
 398  * sometime after booting when the 'ifconfig' program is run.
 399  *
 400  * This routine should set everything up anew at each open, even
 401  * registers that "should" only need to be set once at boot, so that
 402  * there is non-reboot way to recover if something goes wrong.
 403  */
 404 static int
 405 ether3_open(struct net_device *dev)
 406 {
 407         if (!is_valid_ether_addr(dev->dev_addr)) {
 408                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 409                         dev->name);
 410                 return -EINVAL;
 411         }
 412
 413         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 414                 return -EAGAIN;
 415
 416         ether3_init_for_open(dev);
 417
 418         netif_start_queue(dev);
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * The inverse routine to ether3_open().
 425  */
 426 static int
 427 ether3_close(struct net_device *dev)
 428 {
 429         netif_stop_queue(dev);
 430
 431         disable_irq(dev->irq);
 432
 433         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 434         priv(dev)->regs.command = 0;
 435         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 436                 barrier();
 437         ether3_outb(0x80, REG_CONFIG2 + 4);
 438         ether3_outw(0, REG_COMMAND);
 439
 440         free_irq(dev->irq, dev);
 441
 442         return 0;
 443 }
 444
 445 /*
 446  * Get the current statistics.  This may be called with the card open or
 447  * closed.
 448  */
 449 static struct net_device_stats *ether3_getstats(struct net_device *dev)
 450 {
 451         return &priv(dev)->stats;
 452 }
 453
 454 /*
 455  * Set or clear promiscuous/multicast mode filter for this adaptor.
 456  *
 457  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 458  * in which does not have the other ethernet address registers present...
 459  */
 460 static void ether3_setmulticastlist(struct net_device *dev)
 461 {
 462         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 463
 464         if (dev->flags & IFF_PROMISC) {
 465                 /* promiscuous mode */
 466                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 467         } else if (dev->flags & IFF_ALLMULTI) {
 468                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 469         } else
 470                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 471
 472         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 473 }
 474
 475 static void ether3_timeout(struct net_device *dev)
 476 {
 477         unsigned long flags;
 478
 479         del_timer(&priv(dev)->timer);
 480
 481         local_irq_save(flags);
 482         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 483         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 484                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 485         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 486                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 487         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 488                 priv(dev)->tx_head, priv(dev)->tx_tail);
 489         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 490         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 491         local_irq_restore(flags);
 492
 493         priv(dev)->regs.config2 |= CFG2_CTRLO;
 494         priv(dev)->stats.tx_errors += 1;
 495         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 496         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 497
 498         netif_wake_queue(dev);
 499 }
 500
 501 /*
 502  * Transmit a packet
 503  */
 504 static int
 505 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 506 {
 507         unsigned long flags;
 508         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 509         unsigned int ptr, next_ptr;
 510
 511         if (priv(dev)->broken) {
 512                 dev_kfree_skb(skb);
 513                 priv(dev)->stats.tx_dropped ++;
 514                 netif_start_queue(dev);
 515                 return 0;
 516         }
 517
 518         length = (length + 1) & ~1;
 519         if (length != skb->len) {
 520                 if (skb_padto(skb, length))
 521                         goto out;
 522         }
 523
 524         next_ptr = (priv(dev)->tx_head + 1) & 15;
 525
 526         local_irq_save(flags);
 527
 528         if (priv(dev)->tx_tail == next_ptr) {
 529                 local_irq_restore(flags);
 530                 return 1;       /* unable to queue */
 531         }
 532
 533         dev->trans_start = jiffies;
 534         ptr              = 0x600 * priv(dev)->tx_head;
 535         priv(dev)->tx_head = next_ptr;
 536         next_ptr        *= 0x600;
 537
 538 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 539
 540         ether3_setbuffer(dev, buffer_write, next_ptr);
 541         ether3_writelong(dev, 0);
 542         ether3_setbuffer(dev, buffer_write, ptr);
 543         ether3_writelong(dev, 0);
 544         ether3_writebuffer(dev, skb->data, length);
 545         ether3_writeword(dev, htons(next_ptr));
 546         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 547         ether3_setbuffer(dev, buffer_write, ptr);
 548         ether3_writeword(dev, htons((ptr + length + 4)));
 549         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 550         ether3_ledon(dev);
 551
 552         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 553                 ether3_outw(ptr, REG_TRANSMITPTR);
 554                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 555         }
 556
 557         next_ptr = (priv(dev)->tx_head + 1) & 15;
 558         local_irq_restore(flags);
 559
 560         dev_kfree_skb(skb);
 561
 562         if (priv(dev)->tx_tail == next_ptr)
 563                 netif_stop_queue(dev);
 564
 565  out:
 566         return 0;
 567 }
 568
 569 static irqreturn_t
 570 ether3_interrupt(int irq, void *dev_id)
 571 {
 572         struct net_device *dev = (struct net_device *)dev_id;
 573         unsigned int status, handled = IRQ_NONE;
 574
 575 #if NET_DEBUG > 1
 576         if(net_debug & DEBUG_INT)
 577                 printk("eth3irq: %d ", irq);
 578 #endif
 579
 580         status = ether3_inw(REG_STATUS);
 581
 582         if (status & STAT_INTRX) {
 583                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 584                 ether3_rx(dev, 12);
 585                 handled = IRQ_HANDLED;
 586         }
 587
 588         if (status & STAT_INTTX) {
 589                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 590                 ether3_tx(dev);
 591                 handled = IRQ_HANDLED;
 592         }
 593
 594 #if NET_DEBUG > 1
 595         if(net_debug & DEBUG_INT)
 596                 printk("done\n");
 597 #endif
 598         return handled;
 599 }
 600
 601 /*
 602  * If we have a good packet(s), get it/them out of the buffers.
 603  */
 604 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 605 {
 606         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 607
 608         ether3_ledon(dev);
 609
 610         do {
 611                 unsigned int this_ptr, status;
 612                 unsigned char addrs[16];
 613
 614                 /*
 615                  * read the first 16 bytes from the buffer.
 616                  * This contains the status bytes etc and ethernet addresses,
 617                  * and we also check the source ethernet address to see if
 618                  * it originated from us.
 619                  */
 620                 {
 621                         unsigned int temp_ptr;
 622                         ether3_setbuffer(dev, buffer_read, next_ptr);
 623                         temp_ptr = ether3_readword(dev);
 624                         status = ether3_readword(dev);
 625                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 626                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 627                                 break;
 628
 629                         this_ptr = next_ptr + 4;
 630                         next_ptr = ntohs(temp_ptr);
 631                 }
 632                 ether3_setbuffer(dev, buffer_read, this_ptr);
 633                 ether3_readbuffer(dev, addrs+2, 12);
 634
 635 if (next_ptr < RX_START || next_ptr >= RX_END) {
 636  int i;
 637  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 638  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 639  for (i = 2; i < 14; i++)
 640    printk("%02X ", addrs[i]);
 641  printk("\n");
 642  next_ptr = priv(dev)->rx_head;
 643  break;
 644 }
 645                 /*
 646                  * ignore our own packets...
 647                  */
 648                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 649                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 650                         maxcnt ++; /* compensate for loopedback packet */
 651                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 652                 } else
 653                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 654                         unsigned int length = next_ptr - this_ptr;
 655                         struct sk_buff *skb;
 656
 657                         if (next_ptr <= this_ptr)
 658                                 length += RX_END - RX_START;
 659
 660                         skb = dev_alloc_skb(length + 2);
 661                         if (skb) {
 662                                 unsigned char *buf;
 663
 664                                 skb->dev = dev;
 665                                 skb_reserve(skb, 2);
 666                                 buf = skb_put(skb, length);
 667                                 ether3_readbuffer(dev, buf + 12, length - 12);
 668                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 669                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 670                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 671                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 672                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 673                                 skb->protocol = eth_type_trans(skb, dev);
 674                                 netif_rx(skb);
 675                                 received ++;
 676                         } else
 677                                 goto dropping;
 678                 } else {
 679                         struct net_device_stats *stats = &priv(dev)->stats;
 680                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 681                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 682                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 683                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 684                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 685                         stats->rx_errors++;
 686                 }
 687         }
 688         while (-- maxcnt);
 689
 690 done:
 691         priv(dev)->stats.rx_packets += received;
 692         priv(dev)->rx_head = next_ptr;
 693         /*
 694          * If rx went off line, then that means that the buffer may be full.  We
 695          * have dropped at least one packet.
 696          */
 697         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 698                 priv(dev)->stats.rx_dropped ++;
 699                 ether3_outw(next_ptr, REG_RECVPTR);
 700                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 701         }
 702
 703         return maxcnt;
 704
 705 dropping:{
 706         static unsigned long last_warned;
 707
 708         ether3_outw(next_ptr >> 8, REG_RECVEND);
 709         /*
 710          * Don't print this message too many times...
 711          */
 712         if (time_after(jiffies, last_warned + 10 * HZ)) {
 713                 last_warned = jiffies;
 714                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 715         }
 716         priv(dev)->stats.rx_dropped ++;
 717         goto done;
 718         }
 719 }
 720
 721 /*
 722  * Update stats for the transmitted packet(s)
 723  */
 724 static void ether3_tx(struct net_device *dev)
 725 {
 726         unsigned int tx_tail = priv(dev)->tx_tail;
 727         int max_work = 14;
 728
 729         do {
 730                 unsigned long status;
 731
 732                 /*
 733                  * Read the packet header
 734                  */
 735                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 736                 status = ether3_readlong(dev);
 737
 738                 /*
 739                  * Check to see if this packet has been transmitted
 740                  */
 741                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 742                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 743                         break;
 744
 745                 /*
 746                  * Update errors
 747                  */
 748                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 749                         priv(dev)->stats.tx_packets++;
 750                 else {
 751                         priv(dev)->stats.tx_errors ++;
 752                         if (status & TXSTAT_16COLLISIONS)
 753                                 priv(dev)->stats.collisions += 16;
 754                         if (status & TXSTAT_BABBLED)
 755                                 priv(dev)->stats.tx_fifo_errors ++;
 756                 }
 757
 758                 tx_tail = (tx_tail + 1) & 15;
 759         } while (--max_work);
 760
 761         if (priv(dev)->tx_tail != tx_tail) {
 762                 priv(dev)->tx_tail = tx_tail;
 763                 netif_wake_queue(dev);
 764         }
 765 }
 766
 767 static void __devinit ether3_banner(void)
 768 {
 769         static unsigned version_printed = 0;
 770
 771         if (net_debug && version_printed++ == 0)
 772                 printk(KERN_INFO "%s", version);
 773 }
 774
 775 static int __devinit
 776 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 777 {
 778         const struct ether3_data *data = id->data;
 779         struct net_device *dev;
 780         int i, bus_type, ret;
 781
 782         ether3_banner();
 783
 784         ret = ecard_request_resources(ec);
 785         if (ret)
 786                 goto out;
 787
 788         dev = alloc_etherdev(sizeof(struct dev_priv));
 789         if (!dev) {
 790                 ret = -ENOMEM;
 791                 goto release;
 792         }
 793
 794         SET_MODULE_OWNER(dev);
 795         SET_NETDEV_DEV(dev, &ec->dev);
 796
 797         priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 798                                   ecard_resource_len(ec, ECARD_RES_MEMC));
 799         if (!priv(dev)->base) {
 800                 ret = -ENOMEM;
 801                 goto free;
 802         }
 803
 804         ec->irqaddr = priv(dev)->base + data->base_offset;
 805         ec->irqmask = 0xf0;
 806
 807         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 808         dev->irq = ec->irq;
 809
 810         ether3_addr(dev->dev_addr, ec);
 811
 812         init_timer(&priv(dev)->timer);
 813
 814         /* Reset card...
 815          */
 816         ether3_outb(0x80, REG_CONFIG2 + 4);
 817         bus_type = BUS_UNKNOWN;
 818         udelay(4);
 819
 820         /* Test using Receive Pointer (16-bit register) to find out
 821          * how the ether3 is connected to the bus...
 822          */
 823         if (ether3_probe_bus_8(dev, 0x100) &&
 824             ether3_probe_bus_8(dev, 0x201))
 825                 bus_type = BUS_8;
 826
 827         if (bus_type == BUS_UNKNOWN &&
 828             ether3_probe_bus_16(dev, 0x101) &&
 829             ether3_probe_bus_16(dev, 0x201))
 830                 bus_type = BUS_16;
 831
 832         switch (bus_type) {
 833         case BUS_UNKNOWN:
 834                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 835                 ret = -ENODEV;
 836                 goto free;
 837
 838         case BUS_8:
 839                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 840                         "8-bit card\n", dev->name, data->name);
 841                 ret = -ENODEV;
 842                 goto free;
 843
 844         default:
 845                 break;
 846         }
 847
 848         if (ether3_init_2(dev)) {
 849                 ret = -ENODEV;
 850                 goto free;
 851         }
 852
 853         dev->open               = ether3_open;
 854         dev->stop               = ether3_close;
 855         dev->hard_start_xmit    = ether3_sendpacket;
 856         dev->get_stats          = ether3_getstats;
 857         dev->set_multicast_list = ether3_setmulticastlist;
 858         dev->tx_timeout         = ether3_timeout;
 859         dev->watchdog_timeo     = 5 * HZ / 100;
 860
 861         ret = register_netdev(dev);
 862         if (ret)
 863                 goto free;
 864
 865         printk("%s: %s in slot %d, ", dev->name, data->name, ec->slot_no);
 866         for (i = 0; i < 6; i++)
 867                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 868
 869         ecard_set_drvdata(ec, dev);
 870         return 0;
 871
 872  free:
 873         if (priv(dev)->base)
 874                 iounmap(priv(dev)->base);
 875         free_netdev(dev);
 876  release:
 877         ecard_release_resources(ec);
 878  out:
 879         return ret;
 880 }
 881
 882 static void __devexit ether3_remove(struct expansion_card *ec)
 883 {
 884         struct net_device *dev = ecard_get_drvdata(ec);
 885
 886         ecard_set_drvdata(ec, NULL);
 887
 888         unregister_netdev(dev);
 889         iounmap(priv(dev)->base);
 890         free_netdev(dev);
 891         ecard_release_resources(ec);
 892 }
 893
 894 static struct ether3_data ether3 = {
 895         .name           = "ether3",
 896         .base_offset    = 0,
 897 };
 898
 899 static struct ether3_data etherb = {
 900         .name           = "etherb",
 901         .base_offset    = 0x800,
 902 };
 903
 904 static const struct ecard_id ether3_ids[] = {
 905         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 906         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 907         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 908         { 0xffff, 0xffff }
 909 };
 910
 911 static struct ecard_driver ether3_driver = {
 912         .probe          = ether3_probe,
 913         .remove         = __devexit_p(ether3_remove),
 914         .id_table       = ether3_ids,
 915         .drv = {
 916                 .name   = "ether3",
 917         },
 918 };
 919
 920 static int __init ether3_init(void)
 921 {
 922         return ecard_register_driver(&ether3_driver);
 923 }
 924
 925 static void __exit ether3_exit(void)
 926 {
 927         ecard_remove_driver(&ether3_driver);
 928 }
 929
 930 module_init(ether3_init);
 931 module_exit(ether3_exit);
 932
 933 MODULE_LICENSE("GPL");