drivers/net/ethernet/seeq/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/ioport.h>
  55 #include <linux/in.h>
  56 #include <linux/slab.h>
  57 #include <linux/string.h>
  58 #include <linux/errno.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/etherdevice.h>
  61 #include <linux/skbuff.h>
  62 #include <linux/device.h>
  63 #include <linux/init.h>
  64 #include <linux/delay.h>
  65 #include <linux/bitops.h>
  66
  67 #include <asm/ecard.h>
  68 #include <asm/io.h>
  69
  70 static char version[] __devinitdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  71
  72 #include "ether3.h"
  73
  74 static unsigned int net_debug = NET_DEBUG;
  75
  76 static void     ether3_setmulticastlist(struct net_device *dev);
  77 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  78 static void     ether3_tx(struct net_device *dev);
  79 static int      ether3_open (struct net_device *dev);
  80 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  81 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  82 static int      ether3_close (struct net_device *dev);
  83 static void     ether3_setmulticastlist (struct net_device *dev);
  84 static void     ether3_timeout(struct net_device *dev);
  85
  86 #define BUS_16          2
  87 #define BUS_8           1
  88 #define BUS_UNKNOWN     0
  89
  90 /* --------------------------------------------------------------------------- */
  91
  92 typedef enum {
  93         buffer_write,
  94         buffer_read
  95 } buffer_rw_t;
  96
  97 /*
  98  * ether3 read/write.  Slow things down a bit...
  99  * The SEEQ8005 doesn't like us writing to its registers
 100  * too quickly.
 101  */
 102 static inline void ether3_outb(int v, void __iomem *r)
 103 {
 104         writeb(v, r);
 105         udelay(1);
 106 }
 107
 108 static inline void ether3_outw(int v, void __iomem *r)
 109 {
 110         writew(v, r);
 111         udelay(1);
 112 }
 113 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 114 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 115
 116 static int
 117 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 118 {
 119         int timeout = 1000;
 120
 121         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 122         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 123
 124         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 125                 if (!timeout--) {
 126                         printk("%s: setbuffer broken\n", dev->name);
 127                         priv(dev)->broken = 1;
 128                         return 1;
 129                 }
 130                 udelay(1);
 131         }
 132
 133         if (read == buffer_read) {
 134                 ether3_outw(start, REG_DMAADDR);
 135                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 136         } else {
 137                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 138                 ether3_outw(start, REG_DMAADDR);
 139         }
 140         return 0;
 141 }
 142
 143 /*
 144  * write data to the buffer memory
 145  */
 146 #define ether3_writebuffer(dev,data,length)                     \
 147         writesw(REG_BUFWIN, (data), (length) >> 1)
 148
 149 #define ether3_writeword(dev,data)                              \
 150         writew((data), REG_BUFWIN)
 151
 152 #define ether3_writelong(dev,data)      {                       \
 153         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 154         writew((data), reg_bufwin);                             \
 155         writew((data) >> 16, reg_bufwin);                       \
 156 }
 157
 158 /*
 159  * read data from the buffer memory
 160  */
 161 #define ether3_readbuffer(dev,data,length)                      \
 162         readsw(REG_BUFWIN, (data), (length) >> 1)
 163
 164 #define ether3_readword(dev)                                    \
 165         readw(REG_BUFWIN)
 166
 167 #define ether3_readlong(dev)                                    \
 168         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 169
 170 /*
 171  * Switch LED off...
 172  */
 173 static void ether3_ledoff(unsigned long data)
 174 {
 175         struct net_device *dev = (struct net_device *)data;
 176         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 177 }
 178
 179 /*
 180  * switch LED on...
 181  */
 182 static inline void ether3_ledon(struct net_device *dev)
 183 {
 184         del_timer(&priv(dev)->timer);
 185         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 186         priv(dev)->timer.data = (unsigned long)dev;
 187         priv(dev)->timer.function = ether3_ledoff;
 188         add_timer(&priv(dev)->timer);
 189         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 190                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 191 }
 192
 193 /*
 194  * Read the ethernet address string from the on board rom.
 195  * This is an ascii string!!!
 196  */
 197 static int __devinit
 198 ether3_addr(char *addr, struct expansion_card *ec)
 199 {
 200         struct in_chunk_dir cd;
 201         char *s;
 202
 203         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 204                 int i;
 205                 for (i = 0; i<6; i++) {
 206                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 207                         if (*s != (i==5?')' : ':' ))
 208                                 break;
 209                 }
 210                 if (i == 6)
 211                         return 0;
 212         }
 213         /* I wonder if we should even let the user continue in this case
 214          *   - no, it would be better to disable the device
 215          */
 216         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 217         return -ENODEV;
 218 }
 219
 220 /* --------------------------------------------------------------------------- */
 221
 222 static int __devinit
 223 ether3_ramtest(struct net_device *dev, unsigned char byte)
 224 {
 225         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 226         int i,ret = 0;
 227         int max_errors = 4;
 228         int bad = -1;
 229
 230         if (!buffer)
 231                 return 1;
 232
 233         memset(buffer, byte, RX_END);
 234         ether3_setbuffer(dev, buffer_write, 0);
 235         ether3_writebuffer(dev, buffer, TX_END);
 236         ether3_setbuffer(dev, buffer_write, RX_START);
 237         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 238         memset(buffer, byte ^ 0xff, RX_END);
 239         ether3_setbuffer(dev, buffer_read, 0);
 240         ether3_readbuffer(dev, buffer, TX_END);
 241         ether3_setbuffer(dev, buffer_read, RX_START);
 242         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 243
 244         for (i = 0; i < RX_END; i++) {
 245                 if (buffer[i] != byte) {
 246                         if (max_errors > 0 && bad != buffer[i]) {
 247                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 248                                        dev->name, buffer[i], byte, i);
 249                                 ret = 2;
 250                                 max_errors--;
 251                                 bad = i;
 252                         }
 253                 } else {
 254                         if (bad != -1) {
 255                                 if (bad != i - 1)
 256                                         printk(" - 0x%04X\n", i - 1);
 257                                 printk("\n");
 258                                 bad = -1;
 259                         }
 260                 }
 261         }
 262         if (bad != -1)
 263                 printk(" - 0xffff\n");
 264         kfree(buffer);
 265
 266         return ret;
 267 }
 268
 269 /* ------------------------------------------------------------------------------- */
 270
 271 static int __devinit ether3_init_2(struct net_device *dev)
 272 {
 273         int i;
 274
 275         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 276         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 277         priv(dev)->regs.command = 0;
 278
 279         /*
 280          * Set up our hardware address
 281          */
 282         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 283         for (i = 0; i < 6; i++)
 284                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 285
 286         if (dev->flags & IFF_PROMISC)
 287                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 288         else if (dev->flags & IFF_MULTICAST)
 289                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 290         else
 291                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 292
 293         /*
 294          * There is a problem with the NQ8005 in that it occasionally loses the
 295          * last two bytes.  To get round this problem, we receive the CRC as
 296          * well.  That way, if we do lose the last two, then it doesn't matter.
 297          */
 298         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 299         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 300         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 301         ether3_outw(0, REG_TRANSMITPTR);
 302         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 303         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 304         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 305         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 306
 307         i = ether3_ramtest(dev, 0x5A);
 308         if(i)
 309                 return i;
 310         i = ether3_ramtest(dev, 0x1E);
 311         if(i)
 312                 return i;
 313
 314         ether3_setbuffer(dev, buffer_write, 0);
 315         ether3_writelong(dev, 0);
 316         return 0;
 317 }
 318
 319 static void
 320 ether3_init_for_open(struct net_device *dev)
 321 {
 322         int i;
 323
 324         /* Reset the chip */
 325         ether3_outw(CFG2_RESET, REG_CONFIG2);
 326         udelay(4);
 327
 328         priv(dev)->regs.command = 0;
 329         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 330         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 331                 barrier();
 332
 333         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 334         for (i = 0; i < 6; i++)
 335                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 336
 337         priv(dev)->tx_head      = 0;
 338         priv(dev)->tx_tail      = 0;
 339         priv(dev)->regs.config2 |= CFG2_CTRLO;
 340         priv(dev)->rx_head      = RX_START;
 341
 342         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 343         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 344         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 345         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 346         ether3_outw(0, REG_TRANSMITPTR);
 347         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 348         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 349
 350         ether3_setbuffer(dev, buffer_write, 0);
 351         ether3_writelong(dev, 0);
 352
 353         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 354         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 355 }
 356
 357 static inline int
 358 ether3_probe_bus_8(struct net_device *dev, int val)
 359 {
 360         int write_low, write_high, read_low, read_high;
 361
 362         write_low = val & 255;
 363         write_high = val >> 8;
 364
 365         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 366
 367         ether3_outb(write_low, REG_RECVPTR);
 368         ether3_outb(write_high, REG_RECVPTR + 4);
 369
 370         read_low = ether3_inb(REG_RECVPTR);
 371         read_high = ether3_inb(REG_RECVPTR + 4);
 372
 373         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 374
 375         return read_low == write_low && read_high == write_high;
 376 }
 377
 378 static inline int
 379 ether3_probe_bus_16(struct net_device *dev, int val)
 380 {
 381         int read_val;
 382
 383         ether3_outw(val, REG_RECVPTR);
 384         read_val = ether3_inw(REG_RECVPTR);
 385
 386         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 387
 388         return read_val == val;
 389 }
 390
 391 /*
 392  * Open/initialize the board.  This is called (in the current kernel)
 393  * sometime after booting when the 'ifconfig' program is run.
 394  *
 395  * This routine should set everything up anew at each open, even
 396  * registers that "should" only need to be set once at boot, so that
 397  * there is non-reboot way to recover if something goes wrong.
 398  */
 399 static int
 400 ether3_open(struct net_device *dev)
 401 {
 402         if (!is_valid_ether_addr(dev->dev_addr)) {
 403                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 404                         dev->name);
 405                 return -EINVAL;
 406         }
 407
 408         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 409                 return -EAGAIN;
 410
 411         ether3_init_for_open(dev);
 412
 413         netif_start_queue(dev);
 414
 415         return 0;
 416 }
 417
 418 /*
 419  * The inverse routine to ether3_open().
 420  */
 421 static int
 422 ether3_close(struct net_device *dev)
 423 {
 424         netif_stop_queue(dev);
 425
 426         disable_irq(dev->irq);
 427
 428         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 429         priv(dev)->regs.command = 0;
 430         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 431                 barrier();
 432         ether3_outb(0x80, REG_CONFIG2 + 4);
 433         ether3_outw(0, REG_COMMAND);
 434
 435         free_irq(dev->irq, dev);
 436
 437         return 0;
 438 }
 439
 440 /*
 441  * Set or clear promiscuous/multicast mode filter for this adaptor.
 442  *
 443  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 444  * in which does not have the other ethernet address registers present...
 445  */
 446 static void ether3_setmulticastlist(struct net_device *dev)
 447 {
 448         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 449
 450         if (dev->flags & IFF_PROMISC) {
 451                 /* promiscuous mode */
 452                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 453         } else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
 454                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 455         } else
 456                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 457
 458         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 459 }
 460
 461 static void ether3_timeout(struct net_device *dev)
 462 {
 463         unsigned long flags;
 464
 465         del_timer(&priv(dev)->timer);
 466
 467         local_irq_save(flags);
 468         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 469         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 470                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 471         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 472                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 473         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 474                 priv(dev)->tx_head, priv(dev)->tx_tail);
 475         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 476         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 477         local_irq_restore(flags);
 478
 479         priv(dev)->regs.config2 |= CFG2_CTRLO;
 480         dev->stats.tx_errors += 1;
 481         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 482         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 483
 484         netif_wake_queue(dev);
 485 }
 486
 487 /*
 488  * Transmit a packet
 489  */
 490 static int
 491 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 492 {
 493         unsigned long flags;
 494         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 495         unsigned int ptr, next_ptr;
 496
 497         if (priv(dev)->broken) {
 498                 dev_kfree_skb(skb);
 499                 dev->stats.tx_dropped++;
 500                 netif_start_queue(dev);
 501                 return NETDEV_TX_OK;
 502         }
 503
 504         length = (length + 1) & ~1;
 505         if (length != skb->len) {
 506                 if (skb_padto(skb, length))
 507                         goto out;
 508         }
 509
 510         next_ptr = (priv(dev)->tx_head + 1) & 15;
 511
 512         local_irq_save(flags);
 513
 514         if (priv(dev)->tx_tail == next_ptr) {
 515                 local_irq_restore(flags);
 516                 return NETDEV_TX_BUSY;  /* unable to queue */
 517         }
 518
 519         ptr              = 0x600 * priv(dev)->tx_head;
 520         priv(dev)->tx_head = next_ptr;
 521         next_ptr        *= 0x600;
 522
 523 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 524
 525         ether3_setbuffer(dev, buffer_write, next_ptr);
 526         ether3_writelong(dev, 0);
 527         ether3_setbuffer(dev, buffer_write, ptr);
 528         ether3_writelong(dev, 0);
 529         ether3_writebuffer(dev, skb->data, length);
 530         ether3_writeword(dev, htons(next_ptr));
 531         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 532         ether3_setbuffer(dev, buffer_write, ptr);
 533         ether3_writeword(dev, htons((ptr + length + 4)));
 534         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 535         ether3_ledon(dev);
 536
 537         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 538                 ether3_outw(ptr, REG_TRANSMITPTR);
 539                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 540         }
 541
 542         next_ptr = (priv(dev)->tx_head + 1) & 15;
 543         local_irq_restore(flags);
 544
 545         dev_kfree_skb(skb);
 546
 547         if (priv(dev)->tx_tail == next_ptr)
 548                 netif_stop_queue(dev);
 549
 550  out:
 551         return NETDEV_TX_OK;
 552 }
 553
 554 static irqreturn_t
 555 ether3_interrupt(int irq, void *dev_id)
 556 {
 557         struct net_device *dev = (struct net_device *)dev_id;
 558         unsigned int status, handled = IRQ_NONE;
 559
 560 #if NET_DEBUG > 1
 561         if(net_debug & DEBUG_INT)
 562                 printk("eth3irq: %d ", irq);
 563 #endif
 564
 565         status = ether3_inw(REG_STATUS);
 566
 567         if (status & STAT_INTRX) {
 568                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 569                 ether3_rx(dev, 12);
 570                 handled = IRQ_HANDLED;
 571         }
 572
 573         if (status & STAT_INTTX) {
 574                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 575                 ether3_tx(dev);
 576                 handled = IRQ_HANDLED;
 577         }
 578
 579 #if NET_DEBUG > 1
 580         if(net_debug & DEBUG_INT)
 581                 printk("done\n");
 582 #endif
 583         return handled;
 584 }
 585
 586 /*
 587  * If we have a good packet(s), get it/them out of the buffers.
 588  */
 589 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 590 {
 591         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 592
 593         ether3_ledon(dev);
 594
 595         do {
 596                 unsigned int this_ptr, status;
 597                 unsigned char addrs[16];
 598
 599                 /*
 600                  * read the first 16 bytes from the buffer.
 601                  * This contains the status bytes etc and ethernet addresses,
 602                  * and we also check the source ethernet address to see if
 603                  * it originated from us.
 604                  */
 605                 {
 606                         unsigned int temp_ptr;
 607                         ether3_setbuffer(dev, buffer_read, next_ptr);
 608                         temp_ptr = ether3_readword(dev);
 609                         status = ether3_readword(dev);
 610                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 611                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 612                                 break;
 613
 614                         this_ptr = next_ptr + 4;
 615                         next_ptr = ntohs(temp_ptr);
 616                 }
 617                 ether3_setbuffer(dev, buffer_read, this_ptr);
 618                 ether3_readbuffer(dev, addrs+2, 12);
 619
 620 if (next_ptr < RX_START || next_ptr >= RX_END) {
 621  int i;
 622  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 623  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 624  for (i = 2; i < 14; i++)
 625    printk("%02X ", addrs[i]);
 626  printk("\n");
 627  next_ptr = priv(dev)->rx_head;
 628  break;
 629 }
 630                 /*
 631                  * ignore our own packets...
 632                  */
 633                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 634                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 635                         maxcnt ++; /* compensate for loopedback packet */
 636                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 637                 } else
 638                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 639                         unsigned int length = next_ptr - this_ptr;
 640                         struct sk_buff *skb;
 641
 642                         if (next_ptr <= this_ptr)
 643                                 length += RX_END - RX_START;
 644
 645                         skb = netdev_alloc_skb(dev, length + 2);
 646                         if (skb) {
 647                                 unsigned char *buf;
 648
 649                                 skb_reserve(skb, 2);
 650                                 buf = skb_put(skb, length);
 651                                 ether3_readbuffer(dev, buf + 12, length - 12);
 652                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 653                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 654                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 655                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 656                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 657                                 skb->protocol = eth_type_trans(skb, dev);
 658                                 netif_rx(skb);
 659                                 received ++;
 660                         } else
 661                                 goto dropping;
 662                 } else {
 663                         struct net_device_stats *stats = &dev->stats;
 664                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 665                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 666                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 667                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 668                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 669                         stats->rx_errors++;
 670                 }
 671         }
 672         while (-- maxcnt);
 673
 674 done:
 675         dev->stats.rx_packets += received;
 676         priv(dev)->rx_head = next_ptr;
 677         /*
 678          * If rx went off line, then that means that the buffer may be full.  We
 679          * have dropped at least one packet.
 680          */
 681         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 682                 dev->stats.rx_dropped++;
 683                 ether3_outw(next_ptr, REG_RECVPTR);
 684                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 685         }
 686
 687         return maxcnt;
 688
 689 dropping:{
 690         static unsigned long last_warned;
 691
 692         ether3_outw(next_ptr >> 8, REG_RECVEND);
 693         /*
 694          * Don't print this message too many times...
 695          */
 696         if (time_after(jiffies, last_warned + 10 * HZ)) {
 697                 last_warned = jiffies;
 698                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 699         }
 700         dev->stats.rx_dropped++;
 701         goto done;
 702         }
 703 }
 704
 705 /*
 706  * Update stats for the transmitted packet(s)
 707  */
 708 static void ether3_tx(struct net_device *dev)
 709 {
 710         unsigned int tx_tail = priv(dev)->tx_tail;
 711         int max_work = 14;
 712
 713         do {
 714                 unsigned long status;
 715
 716                 /*
 717                  * Read the packet header
 718                  */
 719                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 720                 status = ether3_readlong(dev);
 721
 722                 /*
 723                  * Check to see if this packet has been transmitted
 724                  */
 725                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 726                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 727                         break;
 728
 729                 /*
 730                  * Update errors
 731                  */
 732                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 733                         dev->stats.tx_packets++;
 734                 else {
 735                         dev->stats.tx_errors++;
 736                         if (status & TXSTAT_16COLLISIONS)
 737                                 dev->stats.collisions += 16;
 738                         if (status & TXSTAT_BABBLED)
 739                                 dev->stats.tx_fifo_errors++;
 740                 }
 741
 742                 tx_tail = (tx_tail + 1) & 15;
 743         } while (--max_work);
 744
 745         if (priv(dev)->tx_tail != tx_tail) {
 746                 priv(dev)->tx_tail = tx_tail;
 747                 netif_wake_queue(dev);
 748         }
 749 }
 750
 751 static void __devinit ether3_banner(void)
 752 {
 753         static unsigned version_printed = 0;
 754
 755         if (net_debug && version_printed++ == 0)
 756                 printk(KERN_INFO "%s", version);
 757 }
 758
 759 static const struct net_device_ops ether3_netdev_ops = {
 760         .ndo_open               = ether3_open,
 761         .ndo_stop               = ether3_close,
 762         .ndo_start_xmit         = ether3_sendpacket,
 763         .ndo_set_rx_mode        = ether3_setmulticastlist,
 764         .ndo_tx_timeout         = ether3_timeout,
 765         .ndo_validate_addr      = eth_validate_addr,
 766         .ndo_change_mtu         = eth_change_mtu,
 767         .ndo_set_mac_address    = eth_mac_addr,
 768 };
 769
 770 static int __devinit
 771 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 772 {
 773         const struct ether3_data *data = id->data;
 774         struct net_device *dev;
 775         int bus_type, ret;
 776
 777         ether3_banner();
 778
 779         ret = ecard_request_resources(ec);
 780         if (ret)
 781                 goto out;
 782
 783         dev = alloc_etherdev(sizeof(struct dev_priv));
 784         if (!dev) {
 785                 ret = -ENOMEM;
 786                 goto release;
 787         }
 788
 789         SET_NETDEV_DEV(dev, &ec->dev);
 790
 791         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 792         if (!priv(dev)->base) {
 793                 ret = -ENOMEM;
 794                 goto free;
 795         }
 796
 797         ec->irqaddr = priv(dev)->base + data->base_offset;
 798         ec->irqmask = 0xf0;
 799
 800         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 801         dev->irq = ec->irq;
 802
 803         ether3_addr(dev->dev_addr, ec);
 804
 805         init_timer(&priv(dev)->timer);
 806
 807         /* Reset card...
 808          */
 809         ether3_outb(0x80, REG_CONFIG2 + 4);
 810         bus_type = BUS_UNKNOWN;
 811         udelay(4);
 812
 813         /* Test using Receive Pointer (16-bit register) to find out
 814          * how the ether3 is connected to the bus...
 815          */
 816         if (ether3_probe_bus_8(dev, 0x100) &&
 817             ether3_probe_bus_8(dev, 0x201))
 818                 bus_type = BUS_8;
 819
 820         if (bus_type == BUS_UNKNOWN &&
 821             ether3_probe_bus_16(dev, 0x101) &&
 822             ether3_probe_bus_16(dev, 0x201))
 823                 bus_type = BUS_16;
 824
 825         switch (bus_type) {
 826         case BUS_UNKNOWN:
 827                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 828                 ret = -ENODEV;
 829                 goto free;
 830
 831         case BUS_8:
 832                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 833                         "8-bit card\n", dev->name, data->name);
 834                 ret = -ENODEV;
 835                 goto free;
 836
 837         default:
 838                 break;
 839         }
 840
 841         if (ether3_init_2(dev)) {
 842                 ret = -ENODEV;
 843                 goto free;
 844         }
 845
 846         dev->netdev_ops         = &ether3_netdev_ops;
 847         dev->watchdog_timeo     = 5 * HZ / 100;
 848
 849         ret = register_netdev(dev);
 850         if (ret)
 851                 goto free;
 852
 853         printk("%s: %s in slot %d, %pM\n",
 854                dev->name, data->name, ec->slot_no, dev->dev_addr);
 855
 856         ecard_set_drvdata(ec, dev);
 857         return 0;
 858
 859  free:
 860         free_netdev(dev);
 861  release:
 862         ecard_release_resources(ec);
 863  out:
 864         return ret;
 865 }
 866
 867 static void __devexit ether3_remove(struct expansion_card *ec)
 868 {
 869         struct net_device *dev = ecard_get_drvdata(ec);
 870
 871         ecard_set_drvdata(ec, NULL);
 872
 873         unregister_netdev(dev);
 874         free_netdev(dev);
 875         ecard_release_resources(ec);
 876 }
 877
 878 static struct ether3_data ether3 = {
 879         .name           = "ether3",
 880         .base_offset    = 0,
 881 };
 882
 883 static struct ether3_data etherb = {
 884         .name           = "etherb",
 885         .base_offset    = 0x800,
 886 };
 887
 888 static const struct ecard_id ether3_ids[] = {
 889         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 890         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 891         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 892         { 0xffff, 0xffff }
 893 };
 894
 895 static struct ecard_driver ether3_driver = {
 896         .probe          = ether3_probe,
 897         .remove         = __devexit_p(ether3_remove),
 898         .id_table       = ether3_ids,
 899         .drv = {
 900                 .name   = "ether3",
 901         },
 902 };
 903
 904 static int __init ether3_init(void)
 905 {
 906         return ecard_register_driver(&ether3_driver);
 907 }
 908
 909 static void __exit ether3_exit(void)
 910 {
 911         ecard_remove_driver(&ether3_driver);
 912 }
 913
 914 module_init(ether3_init);
 915 module_exit(ether3_exit);
 916
 917 MODULE_LICENSE("GPL");