drivers/net/arm/ether3.c

   1 /*
   2  *  linux/drivers/acorn/net/ether3.c
   3  *
   4  *  Copyright (C) 1995-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
  11  *  for Acorn machines
  12  *
  13  * By Russell King, with some suggestions from borris@ant.co.uk
  14  *
  15  * Changelog:
  16  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
  17  *                              address up to the higher levels - they're
  18  *                              silently ignored.  I/F can now be put into
  19  *                              multicast mode.  Receiver routine optimised.
  20  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
  21  *                              the kernel rather than when a module.
  22  * 1.06 RMK     02/03/1996      Various code cleanups
  23  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
  24  *                              routines.
  25  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
  26  *                              prevented the kernel message about dropped
  27  *                              packets appearing too many times a second.
  28  *                              Now does not disable all IRQs, only the IRQ
  29  *                              used by this card.
  30  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
  31  *                              but we still service the TX queue if we get a
  32  *                              RX interrupt.
  33  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
  34  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
  35  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
  36  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
  37  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
  38  *                              Chip seems to have a bug in, whereby if the
  39  *                              packet starts two bytes from the end of the
  40  *                              buffer, it corrupts the receiver chain, and
  41  *                              never updates the transmit status correctly.
  42  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
  43  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
  44  *                              hardware.
  45  * 1.16 RMK     10/02/2000      Updated for 2.3.43
  46  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
  47  */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/sched.h>
  52 #include <linux/types.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/ptrace.h>
  56 #include <linux/ioport.h>
  57 #include <linux/in.h>
  58 #include <linux/slab.h>
  59 #include <linux/string.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/etherdevice.h>
  63 #include <linux/skbuff.h>
  64 #include <linux/device.h>
  65 #include <linux/init.h>
  66 #include <linux/delay.h>
  67 #include <linux/bitops.h>
  68
  69 #include <asm/system.h>
  70 #include <asm/ecard.h>
  71 #include <asm/io.h>
  72
  73 static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  74
  75 #include "ether3.h"
  76
  77 static unsigned int net_debug = NET_DEBUG;
  78
  79 static void     ether3_setmulticastlist(struct net_device *dev);
  80 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  81 static void     ether3_tx(struct net_device *dev);
  82 static int      ether3_open (struct net_device *dev);
  83 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  84 static irqreturn_t ether3_interrupt (int irq, void *dev_id, struct pt_regs *regs);
  85 static int      ether3_close (struct net_device *dev);
  86 static struct net_device_stats *ether3_getstats (struct net_device *dev);
  87 static void     ether3_setmulticastlist (struct net_device *dev);
  88 static void     ether3_timeout(struct net_device *dev);
  89
  90 #define BUS_16          2
  91 #define BUS_8           1
  92 #define BUS_UNKNOWN     0
  93
  94 /* --------------------------------------------------------------------------- */
  95
  96 typedef enum {
  97         buffer_write,
  98         buffer_read
  99 } buffer_rw_t;
 100
 101 /*
 102  * ether3 read/write.  Slow things down a bit...
 103  * The SEEQ8005 doesn't like us writing to its registers
 104  * too quickly.
 105  */
 106 static inline void ether3_outb(int v, const void __iomem *r)
 107 {
 108         writeb(v, r);
 109         udelay(1);
 110 }
 111
 112 static inline void ether3_outw(int v, const void __iomem *r)
 113 {
 114         writew(v, r);
 115         udelay(1);
 116 }
 117 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 118 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 119
 120 static int
 121 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 122 {
 123         int timeout = 1000;
 124
 125         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 126         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 127
 128         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 129                 if (!timeout--) {
 130                         printk("%s: setbuffer broken\n", dev->name);
 131                         priv(dev)->broken = 1;
 132                         return 1;
 133                 }
 134                 udelay(1);
 135         }
 136
 137         if (read == buffer_read) {
 138                 ether3_outw(start, REG_DMAADDR);
 139                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 140         } else {
 141                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 142                 ether3_outw(start, REG_DMAADDR);
 143         }
 144         return 0;
 145 }
 146
 147 /*
 148  * write data to the buffer memory
 149  */
 150 #define ether3_writebuffer(dev,data,length)                     \
 151         writesw(REG_BUFWIN, (data), (length) >> 1)
 152
 153 #define ether3_writeword(dev,data)                              \
 154         writew((data), REG_BUFWIN)
 155
 156 #define ether3_writelong(dev,data)      {                       \
 157         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 158         writew((data), reg_bufwin);                             \
 159         writew((data) >> 16, reg_bufwin);                       \
 160 }
 161
 162 /*
 163  * read data from the buffer memory
 164  */
 165 #define ether3_readbuffer(dev,data,length)                      \
 166         readsw(REG_BUFWIN, (data), (length) >> 1)
 167
 168 #define ether3_readword(dev)                                    \
 169         readw(REG_BUFWIN)
 170
 171 #define ether3_readlong(dev)                                    \
 172         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 173
 174 /*
 175  * Switch LED off...
 176  */
 177 static void ether3_ledoff(unsigned long data)
 178 {
 179         struct net_device *dev = (struct net_device *)data;
 180         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 181 }
 182
 183 /*
 184  * switch LED on...
 185  */
 186 static inline void ether3_ledon(struct net_device *dev)
 187 {
 188         del_timer(&priv(dev)->timer);
 189         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 190         priv(dev)->timer.data = (unsigned long)dev;
 191         priv(dev)->timer.function = ether3_ledoff;
 192         add_timer(&priv(dev)->timer);
 193         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 194                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 195 }
 196
 197 /*
 198  * Read the ethernet address string from the on board rom.
 199  * This is an ascii string!!!
 200  */
 201 static int __init
 202 ether3_addr(char *addr, struct expansion_card *ec)
 203 {
 204         struct in_chunk_dir cd;
 205         char *s;
 206
 207         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 208                 int i;
 209                 for (i = 0; i<6; i++) {
 210                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 211                         if (*s != (i==5?')' : ':' ))
 212                                 break;
 213                 }
 214                 if (i == 6)
 215                         return 0;
 216         }
 217         /* I wonder if we should even let the user continue in this case
 218          *   - no, it would be better to disable the device
 219          */
 220         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 221         return -ENODEV;
 222 }
 223
 224 /* --------------------------------------------------------------------------- */
 225
 226 static int __init
 227 ether3_ramtest(struct net_device *dev, unsigned char byte)
 228 {
 229         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 230         int i,ret = 0;
 231         int max_errors = 4;
 232         int bad = -1;
 233
 234         if (!buffer)
 235                 return 1;
 236
 237         memset(buffer, byte, RX_END);
 238         ether3_setbuffer(dev, buffer_write, 0);
 239         ether3_writebuffer(dev, buffer, TX_END);
 240         ether3_setbuffer(dev, buffer_write, RX_START);
 241         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 242         memset(buffer, byte ^ 0xff, RX_END);
 243         ether3_setbuffer(dev, buffer_read, 0);
 244         ether3_readbuffer(dev, buffer, TX_END);
 245         ether3_setbuffer(dev, buffer_read, RX_START);
 246         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 247
 248         for (i = 0; i < RX_END; i++) {
 249                 if (buffer[i] != byte) {
 250                         if (max_errors > 0 && bad != buffer[i]) {
 251                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 252                                        dev->name, buffer[i], byte, i);
 253                                 ret = 2;
 254                                 max_errors--;
 255                                 bad = i;
 256                         }
 257                 } else {
 258                         if (bad != -1) {
 259                                 if (bad != i - 1)
 260                                         printk(" - 0x%04X\n", i - 1);
 261                                 printk("\n");
 262                                 bad = -1;
 263                         }
 264                 }
 265         }
 266         if (bad != -1)
 267                 printk(" - 0xffff\n");
 268         kfree(buffer);
 269
 270         return ret;
 271 }
 272
 273 /* ------------------------------------------------------------------------------- */
 274
 275 static int __init ether3_init_2(struct net_device *dev)
 276 {
 277         int i;
 278
 279         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 280         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 281         priv(dev)->regs.command = 0;
 282
 283         /*
 284          * Set up our hardware address
 285          */
 286         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 287         for (i = 0; i < 6; i++)
 288                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 289
 290         if (dev->flags & IFF_PROMISC)
 291                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 292         else if (dev->flags & IFF_MULTICAST)
 293                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 294         else
 295                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 296
 297         /*
 298          * There is a problem with the NQ8005 in that it occasionally loses the
 299          * last two bytes.  To get round this problem, we receive the CRC as
 300          * well.  That way, if we do lose the last two, then it doesn't matter.
 301          */
 302         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 303         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 304         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 305         ether3_outw(0, REG_TRANSMITPTR);
 306         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 307         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 308         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 309         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 310
 311         i = ether3_ramtest(dev, 0x5A);
 312         if(i)
 313                 return i;
 314         i = ether3_ramtest(dev, 0x1E);
 315         if(i)
 316                 return i;
 317
 318         ether3_setbuffer(dev, buffer_write, 0);
 319         ether3_writelong(dev, 0);
 320         return 0;
 321 }
 322
 323 static void
 324 ether3_init_for_open(struct net_device *dev)
 325 {
 326         int i;
 327
 328         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
 329
 330         /* Reset the chip */
 331         ether3_outw(CFG2_RESET, REG_CONFIG2);
 332         udelay(4);
 333
 334         priv(dev)->regs.command = 0;
 335         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 336         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 337                 barrier();
 338
 339         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 340         for (i = 0; i < 6; i++)
 341                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 342
 343         priv(dev)->tx_head      = 0;
 344         priv(dev)->tx_tail      = 0;
 345         priv(dev)->regs.config2 |= CFG2_CTRLO;
 346         priv(dev)->rx_head      = RX_START;
 347
 348         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 349         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 350         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 351         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 352         ether3_outw(0, REG_TRANSMITPTR);
 353         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 354         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 355
 356         ether3_setbuffer(dev, buffer_write, 0);
 357         ether3_writelong(dev, 0);
 358
 359         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 360         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 361 }
 362
 363 static inline int
 364 ether3_probe_bus_8(struct net_device *dev, int val)
 365 {
 366         int write_low, write_high, read_low, read_high;
 367
 368         write_low = val & 255;
 369         write_high = val >> 8;
 370
 371         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 372
 373         ether3_outb(write_low, REG_RECVPTR);
 374         ether3_outb(write_high, REG_RECVPTR + 4);
 375
 376         read_low = ether3_inb(REG_RECVPTR);
 377         read_high = ether3_inb(REG_RECVPTR + 4);
 378
 379         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 380
 381         return read_low == write_low && read_high == write_high;
 382 }
 383
 384 static inline int
 385 ether3_probe_bus_16(struct net_device *dev, int val)
 386 {
 387         int read_val;
 388
 389         ether3_outw(val, REG_RECVPTR);
 390         read_val = ether3_inw(REG_RECVPTR);
 391
 392         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 393
 394         return read_val == val;
 395 }
 396
 397 /*
 398  * Open/initialize the board.  This is called (in the current kernel)
 399  * sometime after booting when the 'ifconfig' program is run.
 400  *
 401  * This routine should set everything up anew at each open, even
 402  * registers that "should" only need to be set once at boot, so that
 403  * there is non-reboot way to recover if something goes wrong.
 404  */
 405 static int
 406 ether3_open(struct net_device *dev)
 407 {
 408         if (!is_valid_ether_addr(dev->dev_addr)) {
 409                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 410                         dev->name);
 411                 return -EINVAL;
 412         }
 413
 414         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 415                 return -EAGAIN;
 416
 417         ether3_init_for_open(dev);
 418
 419         netif_start_queue(dev);
 420
 421         return 0;
 422 }
 423
 424 /*
 425  * The inverse routine to ether3_open().
 426  */
 427 static int
 428 ether3_close(struct net_device *dev)
 429 {
 430         netif_stop_queue(dev);
 431
 432         disable_irq(dev->irq);
 433
 434         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 435         priv(dev)->regs.command = 0;
 436         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 437                 barrier();
 438         ether3_outb(0x80, REG_CONFIG2 + 4);
 439         ether3_outw(0, REG_COMMAND);
 440
 441         free_irq(dev->irq, dev);
 442
 443         return 0;
 444 }
 445
 446 /*
 447  * Get the current statistics.  This may be called with the card open or
 448  * closed.
 449  */
 450 static struct net_device_stats *ether3_getstats(struct net_device *dev)
 451 {
 452         return &priv(dev)->stats;
 453 }
 454
 455 /*
 456  * Set or clear promiscuous/multicast mode filter for this adaptor.
 457  *
 458  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 459  * in which does not have the other ethernet address registers present...
 460  */
 461 static void ether3_setmulticastlist(struct net_device *dev)
 462 {
 463         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 464
 465         if (dev->flags & IFF_PROMISC) {
 466                 /* promiscuous mode */
 467                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 468         } else if (dev->flags & IFF_ALLMULTI) {
 469                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 470         } else
 471                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 472
 473         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 474 }
 475
 476 static void ether3_timeout(struct net_device *dev)
 477 {
 478         unsigned long flags;
 479
 480         del_timer(&priv(dev)->timer);
 481
 482         local_irq_save(flags);
 483         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 484         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 485                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 486         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 487                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 488         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 489                 priv(dev)->tx_head, priv(dev)->tx_tail);
 490         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 491         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 492         local_irq_restore(flags);
 493
 494         priv(dev)->regs.config2 |= CFG2_CTRLO;
 495         priv(dev)->stats.tx_errors += 1;
 496         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 497         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 498
 499         netif_wake_queue(dev);
 500 }
 501
 502 /*
 503  * Transmit a packet
 504  */
 505 static int
 506 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 507 {
 508         unsigned long flags;
 509         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 510         unsigned int ptr, next_ptr;
 511
 512         if (priv(dev)->broken) {
 513                 dev_kfree_skb(skb);
 514                 priv(dev)->stats.tx_dropped ++;
 515                 netif_start_queue(dev);
 516                 return 0;
 517         }
 518
 519         length = (length + 1) & ~1;
 520         if (length != skb->len) {
 521                 if (skb_padto(skb, length))
 522                         goto out;
 523         }
 524
 525         next_ptr = (priv(dev)->tx_head + 1) & 15;
 526
 527         local_irq_save(flags);
 528
 529         if (priv(dev)->tx_tail == next_ptr) {
 530                 local_irq_restore(flags);
 531                 return 1;       /* unable to queue */
 532         }
 533
 534         dev->trans_start = jiffies;
 535         ptr              = 0x600 * priv(dev)->tx_head;
 536         priv(dev)->tx_head = next_ptr;
 537         next_ptr        *= 0x600;
 538
 539 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 540
 541         ether3_setbuffer(dev, buffer_write, next_ptr);
 542         ether3_writelong(dev, 0);
 543         ether3_setbuffer(dev, buffer_write, ptr);
 544         ether3_writelong(dev, 0);
 545         ether3_writebuffer(dev, skb->data, length);
 546         ether3_writeword(dev, htons(next_ptr));
 547         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 548         ether3_setbuffer(dev, buffer_write, ptr);
 549         ether3_writeword(dev, htons((ptr + length + 4)));
 550         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 551         ether3_ledon(dev);
 552
 553         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 554                 ether3_outw(ptr, REG_TRANSMITPTR);
 555                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 556         }
 557
 558         next_ptr = (priv(dev)->tx_head + 1) & 15;
 559         local_irq_restore(flags);
 560
 561         dev_kfree_skb(skb);
 562
 563         if (priv(dev)->tx_tail == next_ptr)
 564                 netif_stop_queue(dev);
 565
 566  out:
 567         return 0;
 568 }
 569
 570 static irqreturn_t
 571 ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 572 {
 573         struct net_device *dev = (struct net_device *)dev_id;
 574         unsigned int status, handled = IRQ_NONE;
 575
 576 #if NET_DEBUG > 1
 577         if(net_debug & DEBUG_INT)
 578                 printk("eth3irq: %d ", irq);
 579 #endif
 580
 581         status = ether3_inw(REG_STATUS);
 582
 583         if (status & STAT_INTRX) {
 584                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 585                 ether3_rx(dev, 12);
 586                 handled = IRQ_HANDLED;
 587         }
 588
 589         if (status & STAT_INTTX) {
 590                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 591                 ether3_tx(dev);
 592                 handled = IRQ_HANDLED;
 593         }
 594
 595 #if NET_DEBUG > 1
 596         if(net_debug & DEBUG_INT)
 597                 printk("done\n");
 598 #endif
 599         return handled;
 600 }
 601
 602 /*
 603  * If we have a good packet(s), get it/them out of the buffers.
 604  */
 605 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 606 {
 607         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 608
 609         ether3_ledon(dev);
 610
 611         do {
 612                 unsigned int this_ptr, status;
 613                 unsigned char addrs[16];
 614
 615                 /*
 616                  * read the first 16 bytes from the buffer.
 617                  * This contains the status bytes etc and ethernet addresses,
 618                  * and we also check the source ethernet address to see if
 619                  * it originated from us.
 620                  */
 621                 {
 622                         unsigned int temp_ptr;
 623                         ether3_setbuffer(dev, buffer_read, next_ptr);
 624                         temp_ptr = ether3_readword(dev);
 625                         status = ether3_readword(dev);
 626                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 627                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 628                                 break;
 629
 630                         this_ptr = next_ptr + 4;
 631                         next_ptr = ntohs(temp_ptr);
 632                 }
 633                 ether3_setbuffer(dev, buffer_read, this_ptr);
 634                 ether3_readbuffer(dev, addrs+2, 12);
 635
 636 if (next_ptr < RX_START || next_ptr >= RX_END) {
 637  int i;
 638  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 639  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 640  for (i = 2; i < 14; i++)
 641    printk("%02X ", addrs[i]);
 642  printk("\n");
 643  next_ptr = priv(dev)->rx_head;
 644  break;
 645 }
 646                 /*
 647                  * ignore our own packets...
 648                  */
 649                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 650                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 651                         maxcnt ++; /* compensate for loopedback packet */
 652                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 653                 } else
 654                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 655                         unsigned int length = next_ptr - this_ptr;
 656                         struct sk_buff *skb;
 657
 658                         if (next_ptr <= this_ptr)
 659                                 length += RX_END - RX_START;
 660
 661                         skb = dev_alloc_skb(length + 2);
 662                         if (skb) {
 663                                 unsigned char *buf;
 664
 665                                 skb->dev = dev;
 666                                 skb_reserve(skb, 2);
 667                                 buf = skb_put(skb, length);
 668                                 ether3_readbuffer(dev, buf + 12, length - 12);
 669                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 670                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 671                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 672                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 673                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 674                                 skb->protocol = eth_type_trans(skb, dev);
 675                                 netif_rx(skb);
 676                                 received ++;
 677                         } else
 678                                 goto dropping;
 679                 } else {
 680                         struct net_device_stats *stats = &priv(dev)->stats;
 681                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 682                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 683                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 684                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 685                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 686                         stats->rx_errors++;
 687                 }
 688         }
 689         while (-- maxcnt);
 690
 691 done:
 692         priv(dev)->stats.rx_packets += received;
 693         priv(dev)->rx_head = next_ptr;
 694         /*
 695          * If rx went off line, then that means that the buffer may be full.  We
 696          * have dropped at least one packet.
 697          */
 698         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 699                 priv(dev)->stats.rx_dropped ++;
 700                 ether3_outw(next_ptr, REG_RECVPTR);
 701                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 702         }
 703
 704         return maxcnt;
 705
 706 dropping:{
 707         static unsigned long last_warned;
 708
 709         ether3_outw(next_ptr >> 8, REG_RECVEND);
 710         /*
 711          * Don't print this message too many times...
 712          */
 713         if (time_after(jiffies, last_warned + 10 * HZ)) {
 714                 last_warned = jiffies;
 715                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 716         }
 717         priv(dev)->stats.rx_dropped ++;
 718         goto done;
 719         }
 720 }
 721
 722 /*
 723  * Update stats for the transmitted packet(s)
 724  */
 725 static void ether3_tx(struct net_device *dev)
 726 {
 727         unsigned int tx_tail = priv(dev)->tx_tail;
 728         int max_work = 14;
 729
 730         do {
 731                 unsigned long status;
 732
 733                 /*
 734                  * Read the packet header
 735                  */
 736                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 737                 status = ether3_readlong(dev);
 738
 739                 /*
 740                  * Check to see if this packet has been transmitted
 741                  */
 742                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 743                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 744                         break;
 745
 746                 /*
 747                  * Update errors
 748                  */
 749                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 750                         priv(dev)->stats.tx_packets++;
 751                 else {
 752                         priv(dev)->stats.tx_errors ++;
 753                         if (status & TXSTAT_16COLLISIONS)
 754                                 priv(dev)->stats.collisions += 16;
 755                         if (status & TXSTAT_BABBLED)
 756                                 priv(dev)->stats.tx_fifo_errors ++;
 757                 }
 758
 759                 tx_tail = (tx_tail + 1) & 15;
 760         } while (--max_work);
 761
 762         if (priv(dev)->tx_tail != tx_tail) {
 763                 priv(dev)->tx_tail = tx_tail;
 764                 netif_wake_queue(dev);
 765         }
 766 }
 767
 768 static void __init ether3_banner(void)
 769 {
 770         static unsigned version_printed = 0;
 771
 772         if (net_debug && version_printed++ == 0)
 773                 printk(KERN_INFO "%s", version);
 774 }
 775
 776 static int __devinit
 777 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 778 {
 779         const struct ether3_data *data = id->data;
 780         struct net_device *dev;
 781         int i, bus_type, ret;
 782
 783         ether3_banner();
 784
 785         ret = ecard_request_resources(ec);
 786         if (ret)
 787                 goto out;
 788
 789         dev = alloc_etherdev(sizeof(struct dev_priv));
 790         if (!dev) {
 791                 ret = -ENOMEM;
 792                 goto release;
 793         }
 794
 795         SET_MODULE_OWNER(dev);
 796         SET_NETDEV_DEV(dev, &ec->dev);
 797
 798         priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 799                                   ecard_resource_len(ec, ECARD_RES_MEMC));
 800         if (!priv(dev)->base) {
 801                 ret = -ENOMEM;
 802                 goto free;
 803         }
 804
 805         ec->irqaddr = priv(dev)->base + data->base_offset;
 806         ec->irqmask = 0xf0;
 807
 808         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 809         dev->irq = ec->irq;
 810
 811         ether3_addr(dev->dev_addr, ec);
 812
 813         init_timer(&priv(dev)->timer);
 814
 815         /* Reset card...
 816          */
 817         ether3_outb(0x80, REG_CONFIG2 + 4);
 818         bus_type = BUS_UNKNOWN;
 819         udelay(4);
 820
 821         /* Test using Receive Pointer (16-bit register) to find out
 822          * how the ether3 is connected to the bus...
 823          */
 824         if (ether3_probe_bus_8(dev, 0x100) &&
 825             ether3_probe_bus_8(dev, 0x201))
 826                 bus_type = BUS_8;
 827
 828         if (bus_type == BUS_UNKNOWN &&
 829             ether3_probe_bus_16(dev, 0x101) &&
 830             ether3_probe_bus_16(dev, 0x201))
 831                 bus_type = BUS_16;
 832
 833         switch (bus_type) {
 834         case BUS_UNKNOWN:
 835                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 836                 ret = -ENODEV;
 837                 goto free;
 838
 839         case BUS_8:
 840                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 841                         "8-bit card\n", dev->name, data->name);
 842                 ret = -ENODEV;
 843                 goto free;
 844
 845         default:
 846                 break;
 847         }
 848
 849         if (ether3_init_2(dev)) {
 850                 ret = -ENODEV;
 851                 goto free;
 852         }
 853
 854         dev->open               = ether3_open;
 855         dev->stop               = ether3_close;
 856         dev->hard_start_xmit    = ether3_sendpacket;
 857         dev->get_stats          = ether3_getstats;
 858         dev->set_multicast_list = ether3_setmulticastlist;
 859         dev->tx_timeout         = ether3_timeout;
 860         dev->watchdog_timeo     = 5 * HZ / 100;
 861
 862         ret = register_netdev(dev);
 863         if (ret)
 864                 goto free;
 865
 866         printk("%s: %s in slot %d, ", dev->name, data->name, ec->slot_no);
 867         for (i = 0; i < 6; i++)
 868                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 869
 870         ecard_set_drvdata(ec, dev);
 871         return 0;
 872
 873  free:
 874         if (priv(dev)->base)
 875                 iounmap(priv(dev)->base);
 876         free_netdev(dev);
 877  release:
 878         ecard_release_resources(ec);
 879  out:
 880         return ret;
 881 }
 882
 883 static void __devexit ether3_remove(struct expansion_card *ec)
 884 {
 885         struct net_device *dev = ecard_get_drvdata(ec);
 886
 887         ecard_set_drvdata(ec, NULL);
 888
 889         unregister_netdev(dev);
 890         iounmap(priv(dev)->base);
 891         free_netdev(dev);
 892         ecard_release_resources(ec);
 893 }
 894
 895 static struct ether3_data ether3 = {
 896         .name           = "ether3",
 897         .base_offset    = 0,
 898 };
 899
 900 static struct ether3_data etherb = {
 901         .name           = "etherb",
 902         .base_offset    = 0x800,
 903 };
 904
 905 static const struct ecard_id ether3_ids[] = {
 906         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 907         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 908         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 909         { 0xffff, 0xffff }
 910 };
 911
 912 static struct ecard_driver ether3_driver = {
 913         .probe          = ether3_probe,
 914         .remove         = __devexit_p(ether3_remove),
 915         .id_table       = ether3_ids,
 916         .drv = {
 917                 .name   = "ether3",
 918         },
 919 };
 920
 921 static int __init ether3_init(void)
 922 {
 923         return ecard_register_driver(&ether3_driver);
 924 }
 925
 926 static void __exit ether3_exit(void)
 927 {
 928         ecard_remove_driver(&ether3_driver);
 929 }
 930
 931 module_init(ether3_init);
 932 module_exit(ether3_exit);
 933
 934 MODULE_LICENSE("GPL");