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[] = "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(struct timer_list *t)
 174 {
 175         struct dev_priv *private = from_timer(private, t, timer);
 176         struct net_device *dev = private->dev;
 177
 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         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
 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
 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 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 (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 403                 return -EAGAIN;
 404
 405         ether3_init_for_open(dev);
 406
 407         netif_start_queue(dev);
 408
 409         return 0;
 410 }
 411
 412 /*
 413  * The inverse routine to ether3_open().
 414  */
 415 static int
 416 ether3_close(struct net_device *dev)
 417 {
 418         netif_stop_queue(dev);
 419
 420         disable_irq(dev->irq);
 421
 422         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 423         priv(dev)->regs.command = 0;
 424         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 425                 barrier();
 426         ether3_outb(0x80, REG_CONFIG2 + 4);
 427         ether3_outw(0, REG_COMMAND);
 428
 429         free_irq(dev->irq, dev);
 430
 431         return 0;
 432 }
 433
 434 /*
 435  * Set or clear promiscuous/multicast mode filter for this adaptor.
 436  *
 437  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 438  * in which does not have the other ethernet address registers present...
 439  */
 440 static void ether3_setmulticastlist(struct net_device *dev)
 441 {
 442         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 443
 444         if (dev->flags & IFF_PROMISC) {
 445                 /* promiscuous mode */
 446                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 447         } else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
 448                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 449         } else
 450                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 451
 452         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 453 }
 454
 455 static void ether3_timeout(struct net_device *dev)
 456 {
 457         unsigned long flags;
 458
 459         del_timer(&priv(dev)->timer);
 460
 461         local_irq_save(flags);
 462         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 463         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 464                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 465         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 466                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 467         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 468                 priv(dev)->tx_head, priv(dev)->tx_tail);
 469         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 470         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 471         local_irq_restore(flags);
 472
 473         priv(dev)->regs.config2 |= CFG2_CTRLO;
 474         dev->stats.tx_errors += 1;
 475         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 476         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 477
 478         netif_wake_queue(dev);
 479 }
 480
 481 /*
 482  * Transmit a packet
 483  */
 484 static int
 485 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 486 {
 487         unsigned long flags;
 488         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 489         unsigned int ptr, next_ptr;
 490
 491         if (priv(dev)->broken) {
 492                 dev_kfree_skb(skb);
 493                 dev->stats.tx_dropped++;
 494                 netif_start_queue(dev);
 495                 return NETDEV_TX_OK;
 496         }
 497
 498         length = (length + 1) & ~1;
 499         if (length != skb->len) {
 500                 if (skb_padto(skb, length))
 501                         goto out;
 502         }
 503
 504         next_ptr = (priv(dev)->tx_head + 1) & 15;
 505
 506         local_irq_save(flags);
 507
 508         if (priv(dev)->tx_tail == next_ptr) {
 509                 local_irq_restore(flags);
 510                 return NETDEV_TX_BUSY;  /* unable to queue */
 511         }
 512
 513         ptr              = 0x600 * priv(dev)->tx_head;
 514         priv(dev)->tx_head = next_ptr;
 515         next_ptr        *= 0x600;
 516
 517 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 518
 519         ether3_setbuffer(dev, buffer_write, next_ptr);
 520         ether3_writelong(dev, 0);
 521         ether3_setbuffer(dev, buffer_write, ptr);
 522         ether3_writelong(dev, 0);
 523         ether3_writebuffer(dev, skb->data, length);
 524         ether3_writeword(dev, htons(next_ptr));
 525         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 526         ether3_setbuffer(dev, buffer_write, ptr);
 527         ether3_writeword(dev, htons((ptr + length + 4)));
 528         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 529         ether3_ledon(dev);
 530
 531         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 532                 ether3_outw(ptr, REG_TRANSMITPTR);
 533                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 534         }
 535
 536         next_ptr = (priv(dev)->tx_head + 1) & 15;
 537         local_irq_restore(flags);
 538
 539         dev_kfree_skb(skb);
 540
 541         if (priv(dev)->tx_tail == next_ptr)
 542                 netif_stop_queue(dev);
 543
 544  out:
 545         return NETDEV_TX_OK;
 546 }
 547
 548 static irqreturn_t
 549 ether3_interrupt(int irq, void *dev_id)
 550 {
 551         struct net_device *dev = (struct net_device *)dev_id;
 552         unsigned int status, handled = IRQ_NONE;
 553
 554 #if NET_DEBUG > 1
 555         if(net_debug & DEBUG_INT)
 556                 printk("eth3irq: %d ", irq);
 557 #endif
 558
 559         status = ether3_inw(REG_STATUS);
 560
 561         if (status & STAT_INTRX) {
 562                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 563                 ether3_rx(dev, 12);
 564                 handled = IRQ_HANDLED;
 565         }
 566
 567         if (status & STAT_INTTX) {
 568                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 569                 ether3_tx(dev);
 570                 handled = IRQ_HANDLED;
 571         }
 572
 573 #if NET_DEBUG > 1
 574         if(net_debug & DEBUG_INT)
 575                 printk("done\n");
 576 #endif
 577         return handled;
 578 }
 579
 580 /*
 581  * If we have a good packet(s), get it/them out of the buffers.
 582  */
 583 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 584 {
 585         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 586
 587         ether3_ledon(dev);
 588
 589         do {
 590                 unsigned int this_ptr, status;
 591                 unsigned char addrs[16];
 592
 593                 /*
 594                  * read the first 16 bytes from the buffer.
 595                  * This contains the status bytes etc and ethernet addresses,
 596                  * and we also check the source ethernet address to see if
 597                  * it originated from us.
 598                  */
 599                 {
 600                         unsigned int temp_ptr;
 601                         ether3_setbuffer(dev, buffer_read, next_ptr);
 602                         temp_ptr = ether3_readword(dev);
 603                         status = ether3_readword(dev);
 604                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 605                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 606                                 break;
 607
 608                         this_ptr = next_ptr + 4;
 609                         next_ptr = ntohs(temp_ptr);
 610                 }
 611                 ether3_setbuffer(dev, buffer_read, this_ptr);
 612                 ether3_readbuffer(dev, addrs+2, 12);
 613
 614 if (next_ptr < RX_START || next_ptr >= RX_END) {
 615  int i;
 616  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 617  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 618  for (i = 2; i < 14; i++)
 619    printk("%02X ", addrs[i]);
 620  printk("\n");
 621  next_ptr = priv(dev)->rx_head;
 622  break;
 623 }
 624                 /*
 625                  * ignore our own packets...
 626                  */
 627                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 628                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 629                         maxcnt ++; /* compensate for loopedback packet */
 630                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 631                 } else
 632                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 633                         unsigned int length = next_ptr - this_ptr;
 634                         struct sk_buff *skb;
 635
 636                         if (next_ptr <= this_ptr)
 637                                 length += RX_END - RX_START;
 638
 639                         skb = netdev_alloc_skb(dev, length + 2);
 640                         if (skb) {
 641                                 unsigned char *buf;
 642
 643                                 skb_reserve(skb, 2);
 644                                 buf = skb_put(skb, length);
 645                                 ether3_readbuffer(dev, buf + 12, length - 12);
 646                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 647                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 648                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 649                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 650                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 651                                 skb->protocol = eth_type_trans(skb, dev);
 652                                 netif_rx(skb);
 653                                 received ++;
 654                         } else {
 655                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 656                                 dev->stats.rx_dropped++;
 657                                 goto done;
 658                         }
 659                 } else {
 660                         struct net_device_stats *stats = &dev->stats;
 661                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 662                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 663                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 664                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 665                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 666                         stats->rx_errors++;
 667                 }
 668         }
 669         while (-- maxcnt);
 670
 671 done:
 672         dev->stats.rx_packets += received;
 673         priv(dev)->rx_head = next_ptr;
 674         /*
 675          * If rx went off line, then that means that the buffer may be full.  We
 676          * have dropped at least one packet.
 677          */
 678         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 679                 dev->stats.rx_dropped++;
 680                 ether3_outw(next_ptr, REG_RECVPTR);
 681                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 682         }
 683
 684         return maxcnt;
 685 }
 686
 687 /*
 688  * Update stats for the transmitted packet(s)
 689  */
 690 static void ether3_tx(struct net_device *dev)
 691 {
 692         unsigned int tx_tail = priv(dev)->tx_tail;
 693         int max_work = 14;
 694
 695         do {
 696                 unsigned long status;
 697
 698                 /*
 699                  * Read the packet header
 700                  */
 701                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 702                 status = ether3_readlong(dev);
 703
 704                 /*
 705                  * Check to see if this packet has been transmitted
 706                  */
 707                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 708                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 709                         break;
 710
 711                 /*
 712                  * Update errors
 713                  */
 714                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 715                         dev->stats.tx_packets++;
 716                 else {
 717                         dev->stats.tx_errors++;
 718                         if (status & TXSTAT_16COLLISIONS)
 719                                 dev->stats.collisions += 16;
 720                         if (status & TXSTAT_BABBLED)
 721                                 dev->stats.tx_fifo_errors++;
 722                 }
 723
 724                 tx_tail = (tx_tail + 1) & 15;
 725         } while (--max_work);
 726
 727         if (priv(dev)->tx_tail != tx_tail) {
 728                 priv(dev)->tx_tail = tx_tail;
 729                 netif_wake_queue(dev);
 730         }
 731 }
 732
 733 static void ether3_banner(void)
 734 {
 735         static unsigned version_printed = 0;
 736
 737         if (net_debug && version_printed++ == 0)
 738                 printk(KERN_INFO "%s", version);
 739 }
 740
 741 static const struct net_device_ops ether3_netdev_ops = {
 742         .ndo_open               = ether3_open,
 743         .ndo_stop               = ether3_close,
 744         .ndo_start_xmit         = ether3_sendpacket,
 745         .ndo_set_rx_mode        = ether3_setmulticastlist,
 746         .ndo_tx_timeout         = ether3_timeout,
 747         .ndo_validate_addr      = eth_validate_addr,
 748         .ndo_set_mac_address    = eth_mac_addr,
 749 };
 750
 751 static int
 752 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 753 {
 754         const struct ether3_data *data = id->data;
 755         struct net_device *dev;
 756         int bus_type, ret;
 757
 758         ether3_banner();
 759
 760         ret = ecard_request_resources(ec);
 761         if (ret)
 762                 goto out;
 763
 764         dev = alloc_etherdev(sizeof(struct dev_priv));
 765         if (!dev) {
 766                 ret = -ENOMEM;
 767                 goto release;
 768         }
 769
 770         SET_NETDEV_DEV(dev, &ec->dev);
 771
 772         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 773         if (!priv(dev)->base) {
 774                 ret = -ENOMEM;
 775                 goto free;
 776         }
 777
 778         ec->irqaddr = priv(dev)->base + data->base_offset;
 779         ec->irqmask = 0xf0;
 780
 781         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 782         dev->irq = ec->irq;
 783
 784         ether3_addr(dev->dev_addr, ec);
 785
 786         priv(dev)->dev = dev;
 787         timer_setup(&priv(dev)->timer, ether3_ledoff, 0);
 788
 789         /* Reset card...
 790          */
 791         ether3_outb(0x80, REG_CONFIG2 + 4);
 792         bus_type = BUS_UNKNOWN;
 793         udelay(4);
 794
 795         /* Test using Receive Pointer (16-bit register) to find out
 796          * how the ether3 is connected to the bus...
 797          */
 798         if (ether3_probe_bus_8(dev, 0x100) &&
 799             ether3_probe_bus_8(dev, 0x201))
 800                 bus_type = BUS_8;
 801
 802         if (bus_type == BUS_UNKNOWN &&
 803             ether3_probe_bus_16(dev, 0x101) &&
 804             ether3_probe_bus_16(dev, 0x201))
 805                 bus_type = BUS_16;
 806
 807         switch (bus_type) {
 808         case BUS_UNKNOWN:
 809                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 810                 ret = -ENODEV;
 811                 goto free;
 812
 813         case BUS_8:
 814                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 815                         "8-bit card\n", dev->name, data->name);
 816                 ret = -ENODEV;
 817                 goto free;
 818
 819         default:
 820                 break;
 821         }
 822
 823         if (ether3_init_2(dev)) {
 824                 ret = -ENODEV;
 825                 goto free;
 826         }
 827
 828         dev->netdev_ops         = &ether3_netdev_ops;
 829         dev->watchdog_timeo     = 5 * HZ / 100;
 830
 831         ret = register_netdev(dev);
 832         if (ret)
 833                 goto free;
 834
 835         printk("%s: %s in slot %d, %pM\n",
 836                dev->name, data->name, ec->slot_no, dev->dev_addr);
 837
 838         ecard_set_drvdata(ec, dev);
 839         return 0;
 840
 841  free:
 842         free_netdev(dev);
 843  release:
 844         ecard_release_resources(ec);
 845  out:
 846         return ret;
 847 }
 848
 849 static void ether3_remove(struct expansion_card *ec)
 850 {
 851         struct net_device *dev = ecard_get_drvdata(ec);
 852
 853         ecard_set_drvdata(ec, NULL);
 854
 855         unregister_netdev(dev);
 856         free_netdev(dev);
 857         ecard_release_resources(ec);
 858 }
 859
 860 static struct ether3_data ether3 = {
 861         .name           = "ether3",
 862         .base_offset    = 0,
 863 };
 864
 865 static struct ether3_data etherb = {
 866         .name           = "etherb",
 867         .base_offset    = 0x800,
 868 };
 869
 870 static const struct ecard_id ether3_ids[] = {
 871         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 872         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 873         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 874         { 0xffff, 0xffff }
 875 };
 876
 877 static struct ecard_driver ether3_driver = {
 878         .probe          = ether3_probe,
 879         .remove         = ether3_remove,
 880         .id_table       = ether3_ids,
 881         .drv = {
 882                 .name   = "ether3",
 883         },
 884 };
 885
 886 static int __init ether3_init(void)
 887 {
 888         return ecard_register_driver(&ether3_driver);
 889 }
 890
 891 static void __exit ether3_exit(void)
 892 {
 893         ecard_remove_driver(&ether3_driver);
 894 }
 895
 896 module_init(ether3_init);
 897 module_exit(ether3_exit);
 898
 899 MODULE_LICENSE("GPL");