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   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/system.h>
  68 #include <asm/ecard.h>
  69 #include <asm/io.h>
  70
  71 static char version[] __devinitdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  72
  73 #include "ether3.h"
  74
  75 static unsigned int net_debug = NET_DEBUG;
  76
  77 static void     ether3_setmulticastlist(struct net_device *dev);
  78 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  79 static void     ether3_tx(struct net_device *dev);
  80 static int      ether3_open (struct net_device *dev);
  81 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  82 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  83 static int      ether3_close (struct net_device *dev);
  84 static struct net_device_stats *ether3_getstats (struct net_device *dev);
  85 static void     ether3_setmulticastlist (struct net_device *dev);
  86 static void     ether3_timeout(struct net_device *dev);
  87
  88 #define BUS_16          2
  89 #define BUS_8           1
  90 #define BUS_UNKNOWN     0
  91
  92 /* --------------------------------------------------------------------------- */
  93
  94 typedef enum {
  95         buffer_write,
  96         buffer_read
  97 } buffer_rw_t;
  98
  99 /*
 100  * ether3 read/write.  Slow things down a bit...
 101  * The SEEQ8005 doesn't like us writing to its registers
 102  * too quickly.
 103  */
 104 static inline void ether3_outb(int v, const void __iomem *r)
 105 {
 106         writeb(v, r);
 107         udelay(1);
 108 }
 109
 110 static inline void ether3_outw(int v, const void __iomem *r)
 111 {
 112         writew(v, r);
 113         udelay(1);
 114 }
 115 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 116 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 117
 118 static int
 119 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 120 {
 121         int timeout = 1000;
 122
 123         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 124         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 125
 126         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 127                 if (!timeout--) {
 128                         printk("%s: setbuffer broken\n", dev->name);
 129                         priv(dev)->broken = 1;
 130                         return 1;
 131                 }
 132                 udelay(1);
 133         }
 134
 135         if (read == buffer_read) {
 136                 ether3_outw(start, REG_DMAADDR);
 137                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 138         } else {
 139                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 140                 ether3_outw(start, REG_DMAADDR);
 141         }
 142         return 0;
 143 }
 144
 145 /*
 146  * write data to the buffer memory
 147  */
 148 #define ether3_writebuffer(dev,data,length)                     \
 149         writesw(REG_BUFWIN, (data), (length) >> 1)
 150
 151 #define ether3_writeword(dev,data)                              \
 152         writew((data), REG_BUFWIN)
 153
 154 #define ether3_writelong(dev,data)      {                       \
 155         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 156         writew((data), reg_bufwin);                             \
 157         writew((data) >> 16, reg_bufwin);                       \
 158 }
 159
 160 /*
 161  * read data from the buffer memory
 162  */
 163 #define ether3_readbuffer(dev,data,length)                      \
 164         readsw(REG_BUFWIN, (data), (length) >> 1)
 165
 166 #define ether3_readword(dev)                                    \
 167         readw(REG_BUFWIN)
 168
 169 #define ether3_readlong(dev)                                    \
 170         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 171
 172 /*
 173  * Switch LED off...
 174  */
 175 static void ether3_ledoff(unsigned long data)
 176 {
 177         struct net_device *dev = (struct net_device *)data;
 178         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 179 }
 180
 181 /*
 182  * switch LED on...
 183  */
 184 static inline void ether3_ledon(struct net_device *dev)
 185 {
 186         del_timer(&priv(dev)->timer);
 187         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 188         priv(dev)->timer.data = (unsigned long)dev;
 189         priv(dev)->timer.function = ether3_ledoff;
 190         add_timer(&priv(dev)->timer);
 191         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 192                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 193 }
 194
 195 /*
 196  * Read the ethernet address string from the on board rom.
 197  * This is an ascii string!!!
 198  */
 199 static int __devinit
 200 ether3_addr(char *addr, struct expansion_card *ec)
 201 {
 202         struct in_chunk_dir cd;
 203         char *s;
 204
 205         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 206                 int i;
 207                 for (i = 0; i<6; i++) {
 208                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 209                         if (*s != (i==5?')' : ':' ))
 210                                 break;
 211                 }
 212                 if (i == 6)
 213                         return 0;
 214         }
 215         /* I wonder if we should even let the user continue in this case
 216          *   - no, it would be better to disable the device
 217          */
 218         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 219         return -ENODEV;
 220 }
 221
 222 /* --------------------------------------------------------------------------- */
 223
 224 static int __devinit
 225 ether3_ramtest(struct net_device *dev, unsigned char byte)
 226 {
 227         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 228         int i,ret = 0;
 229         int max_errors = 4;
 230         int bad = -1;
 231
 232         if (!buffer)
 233                 return 1;
 234
 235         memset(buffer, byte, RX_END);
 236         ether3_setbuffer(dev, buffer_write, 0);
 237         ether3_writebuffer(dev, buffer, TX_END);
 238         ether3_setbuffer(dev, buffer_write, RX_START);
 239         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 240         memset(buffer, byte ^ 0xff, RX_END);
 241         ether3_setbuffer(dev, buffer_read, 0);
 242         ether3_readbuffer(dev, buffer, TX_END);
 243         ether3_setbuffer(dev, buffer_read, RX_START);
 244         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 245
 246         for (i = 0; i < RX_END; i++) {
 247                 if (buffer[i] != byte) {
 248                         if (max_errors > 0 && bad != buffer[i]) {
 249                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 250                                        dev->name, buffer[i], byte, i);
 251                                 ret = 2;
 252                                 max_errors--;
 253                                 bad = i;
 254                         }
 255                 } else {
 256                         if (bad != -1) {
 257                                 if (bad != i - 1)
 258                                         printk(" - 0x%04X\n", i - 1);
 259                                 printk("\n");
 260                                 bad = -1;
 261                         }
 262                 }
 263         }
 264         if (bad != -1)
 265                 printk(" - 0xffff\n");
 266         kfree(buffer);
 267
 268         return ret;
 269 }
 270
 271 /* ------------------------------------------------------------------------------- */
 272
 273 static int __devinit ether3_init_2(struct net_device *dev)
 274 {
 275         int i;
 276
 277         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 278         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 279         priv(dev)->regs.command = 0;
 280
 281         /*
 282          * Set up our hardware address
 283          */
 284         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 285         for (i = 0; i < 6; i++)
 286                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 287
 288         if (dev->flags & IFF_PROMISC)
 289                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 290         else if (dev->flags & IFF_MULTICAST)
 291                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 292         else
 293                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 294
 295         /*
 296          * There is a problem with the NQ8005 in that it occasionally loses the
 297          * last two bytes.  To get round this problem, we receive the CRC as
 298          * well.  That way, if we do lose the last two, then it doesn't matter.
 299          */
 300         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 301         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 302         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 303         ether3_outw(0, REG_TRANSMITPTR);
 304         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 305         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 306         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 307         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 308
 309         i = ether3_ramtest(dev, 0x5A);
 310         if(i)
 311                 return i;
 312         i = ether3_ramtest(dev, 0x1E);
 313         if(i)
 314                 return i;
 315
 316         ether3_setbuffer(dev, buffer_write, 0);
 317         ether3_writelong(dev, 0);
 318         return 0;
 319 }
 320
 321 static void
 322 ether3_init_for_open(struct net_device *dev)
 323 {
 324         int i;
 325
 326         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
 327
 328         /* Reset the chip */
 329         ether3_outw(CFG2_RESET, REG_CONFIG2);
 330         udelay(4);
 331
 332         priv(dev)->regs.command = 0;
 333         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 334         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 335                 barrier();
 336
 337         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 338         for (i = 0; i < 6; i++)
 339                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 340
 341         priv(dev)->tx_head      = 0;
 342         priv(dev)->tx_tail      = 0;
 343         priv(dev)->regs.config2 |= CFG2_CTRLO;
 344         priv(dev)->rx_head      = RX_START;
 345
 346         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 347         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 348         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 349         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 350         ether3_outw(0, REG_TRANSMITPTR);
 351         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 352         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 353
 354         ether3_setbuffer(dev, buffer_write, 0);
 355         ether3_writelong(dev, 0);
 356
 357         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 358         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 359 }
 360
 361 static inline int
 362 ether3_probe_bus_8(struct net_device *dev, int val)
 363 {
 364         int write_low, write_high, read_low, read_high;
 365
 366         write_low = val & 255;
 367         write_high = val >> 8;
 368
 369         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 370
 371         ether3_outb(write_low, REG_RECVPTR);
 372         ether3_outb(write_high, REG_RECVPTR + 4);
 373
 374         read_low = ether3_inb(REG_RECVPTR);
 375         read_high = ether3_inb(REG_RECVPTR + 4);
 376
 377         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 378
 379         return read_low == write_low && read_high == write_high;
 380 }
 381
 382 static inline int
 383 ether3_probe_bus_16(struct net_device *dev, int val)
 384 {
 385         int read_val;
 386
 387         ether3_outw(val, REG_RECVPTR);
 388         read_val = ether3_inw(REG_RECVPTR);
 389
 390         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 391
 392         return read_val == val;
 393 }
 394
 395 /*
 396  * Open/initialize the board.  This is called (in the current kernel)
 397  * sometime after booting when the 'ifconfig' program is run.
 398  *
 399  * This routine should set everything up anew at each open, even
 400  * registers that "should" only need to be set once at boot, so that
 401  * there is non-reboot way to recover if something goes wrong.
 402  */
 403 static int
 404 ether3_open(struct net_device *dev)
 405 {
 406         if (!is_valid_ether_addr(dev->dev_addr)) {
 407                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 408                         dev->name);
 409                 return -EINVAL;
 410         }
 411
 412         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 413                 return -EAGAIN;
 414
 415         ether3_init_for_open(dev);
 416
 417         netif_start_queue(dev);
 418
 419         return 0;
 420 }
 421
 422 /*
 423  * The inverse routine to ether3_open().
 424  */
 425 static int
 426 ether3_close(struct net_device *dev)
 427 {
 428         netif_stop_queue(dev);
 429
 430         disable_irq(dev->irq);
 431
 432         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 433         priv(dev)->regs.command = 0;
 434         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 435                 barrier();
 436         ether3_outb(0x80, REG_CONFIG2 + 4);
 437         ether3_outw(0, REG_COMMAND);
 438
 439         free_irq(dev->irq, dev);
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * Get the current statistics.  This may be called with the card open or
 446  * closed.
 447  */
 448 static struct net_device_stats *ether3_getstats(struct net_device *dev)
 449 {
 450         return &priv(dev)->stats;
 451 }
 452
 453 /*
 454  * Set or clear promiscuous/multicast mode filter for this adaptor.
 455  *
 456  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 457  * in which does not have the other ethernet address registers present...
 458  */
 459 static void ether3_setmulticastlist(struct net_device *dev)
 460 {
 461         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 462
 463         if (dev->flags & IFF_PROMISC) {
 464                 /* promiscuous mode */
 465                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 466         } else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
 467                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 468         } else
 469                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 470
 471         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 472 }
 473
 474 static void ether3_timeout(struct net_device *dev)
 475 {
 476         unsigned long flags;
 477
 478         del_timer(&priv(dev)->timer);
 479
 480         local_irq_save(flags);
 481         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 482         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 483                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 484         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 485                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 486         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 487                 priv(dev)->tx_head, priv(dev)->tx_tail);
 488         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 489         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 490         local_irq_restore(flags);
 491
 492         priv(dev)->regs.config2 |= CFG2_CTRLO;
 493         priv(dev)->stats.tx_errors += 1;
 494         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 495         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 496
 497         netif_wake_queue(dev);
 498 }
 499
 500 /*
 501  * Transmit a packet
 502  */
 503 static int
 504 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 505 {
 506         unsigned long flags;
 507         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 508         unsigned int ptr, next_ptr;
 509
 510         if (priv(dev)->broken) {
 511                 dev_kfree_skb(skb);
 512                 priv(dev)->stats.tx_dropped ++;
 513                 netif_start_queue(dev);
 514                 return NETDEV_TX_OK;
 515         }
 516
 517         length = (length + 1) & ~1;
 518         if (length != skb->len) {
 519                 if (skb_padto(skb, length))
 520                         goto out;
 521         }
 522
 523         next_ptr = (priv(dev)->tx_head + 1) & 15;
 524
 525         local_irq_save(flags);
 526
 527         if (priv(dev)->tx_tail == next_ptr) {
 528                 local_irq_restore(flags);
 529                 return NETDEV_TX_BUSY;  /* unable to queue */
 530         }
 531
 532         ptr              = 0x600 * priv(dev)->tx_head;
 533         priv(dev)->tx_head = next_ptr;
 534         next_ptr        *= 0x600;
 535
 536 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 537
 538         ether3_setbuffer(dev, buffer_write, next_ptr);
 539         ether3_writelong(dev, 0);
 540         ether3_setbuffer(dev, buffer_write, ptr);
 541         ether3_writelong(dev, 0);
 542         ether3_writebuffer(dev, skb->data, length);
 543         ether3_writeword(dev, htons(next_ptr));
 544         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 545         ether3_setbuffer(dev, buffer_write, ptr);
 546         ether3_writeword(dev, htons((ptr + length + 4)));
 547         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 548         ether3_ledon(dev);
 549
 550         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 551                 ether3_outw(ptr, REG_TRANSMITPTR);
 552                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 553         }
 554
 555         next_ptr = (priv(dev)->tx_head + 1) & 15;
 556         local_irq_restore(flags);
 557
 558         dev_kfree_skb(skb);
 559
 560         if (priv(dev)->tx_tail == next_ptr)
 561                 netif_stop_queue(dev);
 562
 563  out:
 564         return NETDEV_TX_OK;
 565 }
 566
 567 static irqreturn_t
 568 ether3_interrupt(int irq, void *dev_id)
 569 {
 570         struct net_device *dev = (struct net_device *)dev_id;
 571         unsigned int status, handled = IRQ_NONE;
 572
 573 #if NET_DEBUG > 1
 574         if(net_debug & DEBUG_INT)
 575                 printk("eth3irq: %d ", irq);
 576 #endif
 577
 578         status = ether3_inw(REG_STATUS);
 579
 580         if (status & STAT_INTRX) {
 581                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 582                 ether3_rx(dev, 12);
 583                 handled = IRQ_HANDLED;
 584         }
 585
 586         if (status & STAT_INTTX) {
 587                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 588                 ether3_tx(dev);
 589                 handled = IRQ_HANDLED;
 590         }
 591
 592 #if NET_DEBUG > 1
 593         if(net_debug & DEBUG_INT)
 594                 printk("done\n");
 595 #endif
 596         return handled;
 597 }
 598
 599 /*
 600  * If we have a good packet(s), get it/them out of the buffers.
 601  */
 602 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 603 {
 604         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 605
 606         ether3_ledon(dev);
 607
 608         do {
 609                 unsigned int this_ptr, status;
 610                 unsigned char addrs[16];
 611
 612                 /*
 613                  * read the first 16 bytes from the buffer.
 614                  * This contains the status bytes etc and ethernet addresses,
 615                  * and we also check the source ethernet address to see if
 616                  * it originated from us.
 617                  */
 618                 {
 619                         unsigned int temp_ptr;
 620                         ether3_setbuffer(dev, buffer_read, next_ptr);
 621                         temp_ptr = ether3_readword(dev);
 622                         status = ether3_readword(dev);
 623                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 624                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 625                                 break;
 626
 627                         this_ptr = next_ptr + 4;
 628                         next_ptr = ntohs(temp_ptr);
 629                 }
 630                 ether3_setbuffer(dev, buffer_read, this_ptr);
 631                 ether3_readbuffer(dev, addrs+2, 12);
 632
 633 if (next_ptr < RX_START || next_ptr >= RX_END) {
 634  int i;
 635  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 636  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 637  for (i = 2; i < 14; i++)
 638    printk("%02X ", addrs[i]);
 639  printk("\n");
 640  next_ptr = priv(dev)->rx_head;
 641  break;
 642 }
 643                 /*
 644                  * ignore our own packets...
 645                  */
 646                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 647                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 648                         maxcnt ++; /* compensate for loopedback packet */
 649                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 650                 } else
 651                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 652                         unsigned int length = next_ptr - this_ptr;
 653                         struct sk_buff *skb;
 654
 655                         if (next_ptr <= this_ptr)
 656                                 length += RX_END - RX_START;
 657
 658                         skb = dev_alloc_skb(length + 2);
 659                         if (skb) {
 660                                 unsigned char *buf;
 661
 662                                 skb_reserve(skb, 2);
 663                                 buf = skb_put(skb, length);
 664                                 ether3_readbuffer(dev, buf + 12, length - 12);
 665                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 666                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 667                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 668                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 669                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 670                                 skb->protocol = eth_type_trans(skb, dev);
 671                                 netif_rx(skb);
 672                                 received ++;
 673                         } else
 674                                 goto dropping;
 675                 } else {
 676                         struct net_device_stats *stats = &priv(dev)->stats;
 677                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 678                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 679                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 680                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 681                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 682                         stats->rx_errors++;
 683                 }
 684         }
 685         while (-- maxcnt);
 686
 687 done:
 688         priv(dev)->stats.rx_packets += received;
 689         priv(dev)->rx_head = next_ptr;
 690         /*
 691          * If rx went off line, then that means that the buffer may be full.  We
 692          * have dropped at least one packet.
 693          */
 694         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 695                 priv(dev)->stats.rx_dropped ++;
 696                 ether3_outw(next_ptr, REG_RECVPTR);
 697                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 698         }
 699
 700         return maxcnt;
 701
 702 dropping:{
 703         static unsigned long last_warned;
 704
 705         ether3_outw(next_ptr >> 8, REG_RECVEND);
 706         /*
 707          * Don't print this message too many times...
 708          */
 709         if (time_after(jiffies, last_warned + 10 * HZ)) {
 710                 last_warned = jiffies;
 711                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 712         }
 713         priv(dev)->stats.rx_dropped ++;
 714         goto done;
 715         }
 716 }
 717
 718 /*
 719  * Update stats for the transmitted packet(s)
 720  */
 721 static void ether3_tx(struct net_device *dev)
 722 {
 723         unsigned int tx_tail = priv(dev)->tx_tail;
 724         int max_work = 14;
 725
 726         do {
 727                 unsigned long status;
 728
 729                 /*
 730                  * Read the packet header
 731                  */
 732                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 733                 status = ether3_readlong(dev);
 734
 735                 /*
 736                  * Check to see if this packet has been transmitted
 737                  */
 738                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 739                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 740                         break;
 741
 742                 /*
 743                  * Update errors
 744                  */
 745                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 746                         priv(dev)->stats.tx_packets++;
 747                 else {
 748                         priv(dev)->stats.tx_errors ++;
 749                         if (status & TXSTAT_16COLLISIONS)
 750                                 priv(dev)->stats.collisions += 16;
 751                         if (status & TXSTAT_BABBLED)
 752                                 priv(dev)->stats.tx_fifo_errors ++;
 753                 }
 754
 755                 tx_tail = (tx_tail + 1) & 15;
 756         } while (--max_work);
 757
 758         if (priv(dev)->tx_tail != tx_tail) {
 759                 priv(dev)->tx_tail = tx_tail;
 760                 netif_wake_queue(dev);
 761         }
 762 }
 763
 764 static void __devinit ether3_banner(void)
 765 {
 766         static unsigned version_printed = 0;
 767
 768         if (net_debug && version_printed++ == 0)
 769                 printk(KERN_INFO "%s", version);
 770 }
 771
 772 static const struct net_device_ops ether3_netdev_ops = {
 773         .ndo_open               = ether3_open,
 774         .ndo_stop               = ether3_close,
 775         .ndo_start_xmit         = ether3_sendpacket,
 776         .ndo_get_stats          = ether3_getstats,
 777         .ndo_set_multicast_list = ether3_setmulticastlist,
 778         .ndo_tx_timeout         = ether3_timeout,
 779         .ndo_validate_addr      = eth_validate_addr,
 780         .ndo_change_mtu         = eth_change_mtu,
 781         .ndo_set_mac_address    = eth_mac_addr,
 782 };
 783
 784 static int __devinit
 785 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 786 {
 787         const struct ether3_data *data = id->data;
 788         struct net_device *dev;
 789         int bus_type, ret;
 790
 791         ether3_banner();
 792
 793         ret = ecard_request_resources(ec);
 794         if (ret)
 795                 goto out;
 796
 797         dev = alloc_etherdev(sizeof(struct dev_priv));
 798         if (!dev) {
 799                 ret = -ENOMEM;
 800                 goto release;
 801         }
 802
 803         SET_NETDEV_DEV(dev, &ec->dev);
 804
 805         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 806         if (!priv(dev)->base) {
 807                 ret = -ENOMEM;
 808                 goto free;
 809         }
 810
 811         ec->irqaddr = priv(dev)->base + data->base_offset;
 812         ec->irqmask = 0xf0;
 813
 814         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 815         dev->irq = ec->irq;
 816
 817         ether3_addr(dev->dev_addr, ec);
 818
 819         init_timer(&priv(dev)->timer);
 820
 821         /* Reset card...
 822          */
 823         ether3_outb(0x80, REG_CONFIG2 + 4);
 824         bus_type = BUS_UNKNOWN;
 825         udelay(4);
 826
 827         /* Test using Receive Pointer (16-bit register) to find out
 828          * how the ether3 is connected to the bus...
 829          */
 830         if (ether3_probe_bus_8(dev, 0x100) &&
 831             ether3_probe_bus_8(dev, 0x201))
 832                 bus_type = BUS_8;
 833
 834         if (bus_type == BUS_UNKNOWN &&
 835             ether3_probe_bus_16(dev, 0x101) &&
 836             ether3_probe_bus_16(dev, 0x201))
 837                 bus_type = BUS_16;
 838
 839         switch (bus_type) {
 840         case BUS_UNKNOWN:
 841                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 842                 ret = -ENODEV;
 843                 goto free;
 844
 845         case BUS_8:
 846                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 847                         "8-bit card\n", dev->name, data->name);
 848                 ret = -ENODEV;
 849                 goto free;
 850
 851         default:
 852                 break;
 853         }
 854
 855         if (ether3_init_2(dev)) {
 856                 ret = -ENODEV;
 857                 goto free;
 858         }
 859
 860         dev->netdev_ops         = &ether3_netdev_ops;
 861         dev->watchdog_timeo     = 5 * HZ / 100;
 862
 863         ret = register_netdev(dev);
 864         if (ret)
 865                 goto free;
 866
 867         printk("%s: %s in slot %d, %pM\n",
 868                dev->name, data->name, ec->slot_no, dev->dev_addr);
 869
 870         ecard_set_drvdata(ec, dev);
 871         return 0;
 872
 873  free:
 874         free_netdev(dev);
 875  release:
 876         ecard_release_resources(ec);
 877  out:
 878         return ret;
 879 }
 880
 881 static void __devexit ether3_remove(struct expansion_card *ec)
 882 {
 883         struct net_device *dev = ecard_get_drvdata(ec);
 884
 885         ecard_set_drvdata(ec, NULL);
 886
 887         unregister_netdev(dev);
 888         free_netdev(dev);
 889         ecard_release_resources(ec);
 890 }
 891
 892 static struct ether3_data ether3 = {
 893         .name           = "ether3",
 894         .base_offset    = 0,
 895 };
 896
 897 static struct ether3_data etherb = {
 898         .name           = "etherb",
 899         .base_offset    = 0x800,
 900 };
 901
 902 static const struct ecard_id ether3_ids[] = {
 903         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 904         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 905         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 906         { 0xffff, 0xffff }
 907 };
 908
 909 static struct ecard_driver ether3_driver = {
 910         .probe          = ether3_probe,
 911         .remove         = __devexit_p(ether3_remove),
 912         .id_table       = ether3_ids,
 913         .drv = {
 914                 .name   = "ether3",
 915         },
 916 };
 917
 918 static int __init ether3_init(void)
 919 {
 920         return ecard_register_driver(&ether3_driver);
 921 }
 922
 923 static void __exit ether3_exit(void)
 924 {
 925         ecard_remove_driver(&ether3_driver);
 926 }
 927
 928 module_init(ether3_init);
 929 module_exit(ether3_exit);
 930
 931 MODULE_LICENSE("GPL");