drivers/net/ethernet/seeq/ether3.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/acorn/net/ether3.c
   4  *
   5  *  Copyright (C) 1995-2000 Russell King
   6  *
   7  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
   8  *  for Acorn machines
   9  *
  10  * By Russell King, with some suggestions from borris@ant.co.uk
  11  *
  12  * Changelog:
  13  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
  14  *                              address up to the higher levels - they're
  15  *                              silently ignored.  I/F can now be put into
  16  *                              multicast mode.  Receiver routine optimised.
  17  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
  18  *                              the kernel rather than when a module.
  19  * 1.06 RMK     02/03/1996      Various code cleanups
  20  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
  21  *                              routines.
  22  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
  23  *                              prevented the kernel message about dropped
  24  *                              packets appearing too many times a second.
  25  *                              Now does not disable all IRQs, only the IRQ
  26  *                              used by this card.
  27  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
  28  *                              but we still service the TX queue if we get a
  29  *                              RX interrupt.
  30  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
  31  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
  32  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
  33  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
  34  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
  35  *                              Chip seems to have a bug in, whereby if the
  36  *                              packet starts two bytes from the end of the
  37  *                              buffer, it corrupts the receiver chain, and
  38  *                              never updates the transmit status correctly.
  39  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
  40  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
  41  *                              hardware.
  42  * 1.16 RMK     10/02/2000      Updated for 2.3.43
  43  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/kernel.h>
  48 #include <linux/types.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/interrupt.h>
  51 #include <linux/ioport.h>
  52 #include <linux/in.h>
  53 #include <linux/slab.h>
  54 #include <linux/string.h>
  55 #include <linux/errno.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/etherdevice.h>
  58 #include <linux/skbuff.h>
  59 #include <linux/device.h>
  60 #include <linux/init.h>
  61 #include <linux/delay.h>
  62 #include <linux/bitops.h>
  63
  64 #include <asm/ecard.h>
  65 #include <asm/io.h>
  66
  67 static char version[] = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  68
  69 #include "ether3.h"
  70
  71 static unsigned int net_debug = NET_DEBUG;
  72
  73 static void     ether3_setmulticastlist(struct net_device *dev);
  74 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  75 static void     ether3_tx(struct net_device *dev);
  76 static int      ether3_open (struct net_device *dev);
  77 static netdev_tx_t      ether3_sendpacket(struct sk_buff *skb,
  78                                           struct net_device *dev);
  79 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  80 static int      ether3_close (struct net_device *dev);
  81 static void     ether3_setmulticastlist (struct net_device *dev);
  82 static void     ether3_timeout(struct net_device *dev);
  83
  84 #define BUS_16          2
  85 #define BUS_8           1
  86 #define BUS_UNKNOWN     0
  87
  88 /* --------------------------------------------------------------------------- */
  89
  90 typedef enum {
  91         buffer_write,
  92         buffer_read
  93 } buffer_rw_t;
  94
  95 /*
  96  * ether3 read/write.  Slow things down a bit...
  97  * The SEEQ8005 doesn't like us writing to its registers
  98  * too quickly.
  99  */
 100 static inline void ether3_outb(int v, void __iomem *r)
 101 {
 102         writeb(v, r);
 103         udelay(1);
 104 }
 105
 106 static inline void ether3_outw(int v, void __iomem *r)
 107 {
 108         writew(v, r);
 109         udelay(1);
 110 }
 111 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 112 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 113
 114 static int
 115 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 116 {
 117         int timeout = 1000;
 118
 119         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 120         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 121
 122         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 123                 if (!timeout--) {
 124                         printk("%s: setbuffer broken\n", dev->name);
 125                         priv(dev)->broken = 1;
 126                         return 1;
 127                 }
 128                 udelay(1);
 129         }
 130
 131         if (read == buffer_read) {
 132                 ether3_outw(start, REG_DMAADDR);
 133                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 134         } else {
 135                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 136                 ether3_outw(start, REG_DMAADDR);
 137         }
 138         return 0;
 139 }
 140
 141 /*
 142  * write data to the buffer memory
 143  */
 144 #define ether3_writebuffer(dev,data,length)                     \
 145         writesw(REG_BUFWIN, (data), (length) >> 1)
 146
 147 #define ether3_writeword(dev,data)                              \
 148         writew((data), REG_BUFWIN)
 149
 150 #define ether3_writelong(dev,data)      {                       \
 151         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 152         writew((data), reg_bufwin);                             \
 153         writew((data) >> 16, reg_bufwin);                       \
 154 }
 155
 156 /*
 157  * read data from the buffer memory
 158  */
 159 #define ether3_readbuffer(dev,data,length)                      \
 160         readsw(REG_BUFWIN, (data), (length) >> 1)
 161
 162 #define ether3_readword(dev)                                    \
 163         readw(REG_BUFWIN)
 164
 165 #define ether3_readlong(dev)                                    \
 166         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 167
 168 /*
 169  * Switch LED off...
 170  */
 171 static void ether3_ledoff(struct timer_list *t)
 172 {
 173         struct dev_priv *private = from_timer(private, t, timer);
 174         struct net_device *dev = private->dev;
 175
 176         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 177 }
 178
 179 /*
 180  * switch LED on...
 181  */
 182 static inline void ether3_ledon(struct net_device *dev)
 183 {
 184         del_timer(&priv(dev)->timer);
 185         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 186         add_timer(&priv(dev)->timer);
 187         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 188                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 189 }
 190
 191 /*
 192  * Read the ethernet address string from the on board rom.
 193  * This is an ascii string!!!
 194  */
 195 static int
 196 ether3_addr(char *addr, struct expansion_card *ec)
 197 {
 198         struct in_chunk_dir cd;
 199         char *s;
 200
 201         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 202                 int i;
 203                 for (i = 0; i<6; i++) {
 204                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 205                         if (*s != (i==5?')' : ':' ))
 206                                 break;
 207                 }
 208                 if (i == 6)
 209                         return 0;
 210         }
 211         /* I wonder if we should even let the user continue in this case
 212          *   - no, it would be better to disable the device
 213          */
 214         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 215         return -ENODEV;
 216 }
 217
 218 /* --------------------------------------------------------------------------- */
 219
 220 static int
 221 ether3_ramtest(struct net_device *dev, unsigned char byte)
 222 {
 223         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 224         int i,ret = 0;
 225         int max_errors = 4;
 226         int bad = -1;
 227
 228         if (!buffer)
 229                 return 1;
 230
 231         memset(buffer, byte, RX_END);
 232         ether3_setbuffer(dev, buffer_write, 0);
 233         ether3_writebuffer(dev, buffer, TX_END);
 234         ether3_setbuffer(dev, buffer_write, RX_START);
 235         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 236         memset(buffer, byte ^ 0xff, RX_END);
 237         ether3_setbuffer(dev, buffer_read, 0);
 238         ether3_readbuffer(dev, buffer, TX_END);
 239         ether3_setbuffer(dev, buffer_read, RX_START);
 240         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 241
 242         for (i = 0; i < RX_END; i++) {
 243                 if (buffer[i] != byte) {
 244                         if (max_errors > 0 && bad != buffer[i]) {
 245                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 246                                        dev->name, buffer[i], byte, i);
 247                                 ret = 2;
 248                                 max_errors--;
 249                                 bad = i;
 250                         }
 251                 } else {
 252                         if (bad != -1) {
 253                                 if (bad != i - 1)
 254                                         printk(" - 0x%04X\n", i - 1);
 255                                 printk("\n");
 256                                 bad = -1;
 257                         }
 258                 }
 259         }
 260         if (bad != -1)
 261                 printk(" - 0xffff\n");
 262         kfree(buffer);
 263
 264         return ret;
 265 }
 266
 267 /* ------------------------------------------------------------------------------- */
 268
 269 static int ether3_init_2(struct net_device *dev)
 270 {
 271         int i;
 272
 273         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 274         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 275         priv(dev)->regs.command = 0;
 276
 277         /*
 278          * Set up our hardware address
 279          */
 280         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 281         for (i = 0; i < 6; i++)
 282                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 283
 284         if (dev->flags & IFF_PROMISC)
 285                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 286         else if (dev->flags & IFF_MULTICAST)
 287                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 288         else
 289                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 290
 291         /*
 292          * There is a problem with the NQ8005 in that it occasionally loses the
 293          * last two bytes.  To get round this problem, we receive the CRC as
 294          * well.  That way, if we do lose the last two, then it doesn't matter.
 295          */
 296         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 297         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 298         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 299         ether3_outw(0, REG_TRANSMITPTR);
 300         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 301         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 302         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 303         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 304
 305         i = ether3_ramtest(dev, 0x5A);
 306         if(i)
 307                 return i;
 308         i = ether3_ramtest(dev, 0x1E);
 309         if(i)
 310                 return i;
 311
 312         ether3_setbuffer(dev, buffer_write, 0);
 313         ether3_writelong(dev, 0);
 314         return 0;
 315 }
 316
 317 static void
 318 ether3_init_for_open(struct net_device *dev)
 319 {
 320         int i;
 321
 322         /* Reset the chip */
 323         ether3_outw(CFG2_RESET, REG_CONFIG2);
 324         udelay(4);
 325
 326         priv(dev)->regs.command = 0;
 327         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 328         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 329                 barrier();
 330
 331         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 332         for (i = 0; i < 6; i++)
 333                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 334
 335         priv(dev)->tx_head      = 0;
 336         priv(dev)->tx_tail      = 0;
 337         priv(dev)->regs.config2 |= CFG2_CTRLO;
 338         priv(dev)->rx_head      = RX_START;
 339
 340         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 341         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 342         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 343         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 344         ether3_outw(0, REG_TRANSMITPTR);
 345         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 346         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 347
 348         ether3_setbuffer(dev, buffer_write, 0);
 349         ether3_writelong(dev, 0);
 350
 351         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 352         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 353 }
 354
 355 static inline int
 356 ether3_probe_bus_8(struct net_device *dev, int val)
 357 {
 358         int write_low, write_high, read_low, read_high;
 359
 360         write_low = val & 255;
 361         write_high = val >> 8;
 362
 363         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 364
 365         ether3_outb(write_low, REG_RECVPTR);
 366         ether3_outb(write_high, REG_RECVPTR + 4);
 367
 368         read_low = ether3_inb(REG_RECVPTR);
 369         read_high = ether3_inb(REG_RECVPTR + 4);
 370
 371         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 372
 373         return read_low == write_low && read_high == write_high;
 374 }
 375
 376 static inline int
 377 ether3_probe_bus_16(struct net_device *dev, int val)
 378 {
 379         int read_val;
 380
 381         ether3_outw(val, REG_RECVPTR);
 382         read_val = ether3_inw(REG_RECVPTR);
 383
 384         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 385
 386         return read_val == val;
 387 }
 388
 389 /*
 390  * Open/initialize the board.  This is called (in the current kernel)
 391  * sometime after booting when the 'ifconfig' program is run.
 392  *
 393  * This routine should set everything up anew at each open, even
 394  * registers that "should" only need to be set once at boot, so that
 395  * there is non-reboot way to recover if something goes wrong.
 396  */
 397 static int
 398 ether3_open(struct net_device *dev)
 399 {
 400         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 401                 return -EAGAIN;
 402
 403         ether3_init_for_open(dev);
 404
 405         netif_start_queue(dev);
 406
 407         return 0;
 408 }
 409
 410 /*
 411  * The inverse routine to ether3_open().
 412  */
 413 static int
 414 ether3_close(struct net_device *dev)
 415 {
 416         netif_stop_queue(dev);
 417
 418         disable_irq(dev->irq);
 419
 420         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 421         priv(dev)->regs.command = 0;
 422         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 423                 barrier();
 424         ether3_outb(0x80, REG_CONFIG2 + 4);
 425         ether3_outw(0, REG_COMMAND);
 426
 427         free_irq(dev->irq, dev);
 428
 429         return 0;
 430 }
 431
 432 /*
 433  * Set or clear promiscuous/multicast mode filter for this adaptor.
 434  *
 435  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 436  * in which does not have the other ethernet address registers present...
 437  */
 438 static void ether3_setmulticastlist(struct net_device *dev)
 439 {
 440         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 441
 442         if (dev->flags & IFF_PROMISC) {
 443                 /* promiscuous mode */
 444                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 445         } else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
 446                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 447         } else
 448                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 449
 450         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 451 }
 452
 453 static void ether3_timeout(struct net_device *dev)
 454 {
 455         unsigned long flags;
 456
 457         del_timer(&priv(dev)->timer);
 458
 459         local_irq_save(flags);
 460         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 461         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 462                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 463         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 464                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 465         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 466                 priv(dev)->tx_head, priv(dev)->tx_tail);
 467         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 468         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 469         local_irq_restore(flags);
 470
 471         priv(dev)->regs.config2 |= CFG2_CTRLO;
 472         dev->stats.tx_errors += 1;
 473         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 474         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 475
 476         netif_wake_queue(dev);
 477 }
 478
 479 /*
 480  * Transmit a packet
 481  */
 482 static netdev_tx_t
 483 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 484 {
 485         unsigned long flags;
 486         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 487         unsigned int ptr, next_ptr;
 488
 489         if (priv(dev)->broken) {
 490                 dev_kfree_skb(skb);
 491                 dev->stats.tx_dropped++;
 492                 netif_start_queue(dev);
 493                 return NETDEV_TX_OK;
 494         }
 495
 496         length = (length + 1) & ~1;
 497         if (length != skb->len) {
 498                 if (skb_padto(skb, length))
 499                         goto out;
 500         }
 501
 502         next_ptr = (priv(dev)->tx_head + 1) & 15;
 503
 504         local_irq_save(flags);
 505
 506         if (priv(dev)->tx_tail == next_ptr) {
 507                 local_irq_restore(flags);
 508                 return NETDEV_TX_BUSY;  /* unable to queue */
 509         }
 510
 511         ptr              = 0x600 * priv(dev)->tx_head;
 512         priv(dev)->tx_head = next_ptr;
 513         next_ptr        *= 0x600;
 514
 515 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 516
 517         ether3_setbuffer(dev, buffer_write, next_ptr);
 518         ether3_writelong(dev, 0);
 519         ether3_setbuffer(dev, buffer_write, ptr);
 520         ether3_writelong(dev, 0);
 521         ether3_writebuffer(dev, skb->data, length);
 522         ether3_writeword(dev, htons(next_ptr));
 523         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 524         ether3_setbuffer(dev, buffer_write, ptr);
 525         ether3_writeword(dev, htons((ptr + length + 4)));
 526         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 527         ether3_ledon(dev);
 528
 529         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 530                 ether3_outw(ptr, REG_TRANSMITPTR);
 531                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 532         }
 533
 534         next_ptr = (priv(dev)->tx_head + 1) & 15;
 535         local_irq_restore(flags);
 536
 537         dev_kfree_skb(skb);
 538
 539         if (priv(dev)->tx_tail == next_ptr)
 540                 netif_stop_queue(dev);
 541
 542  out:
 543         return NETDEV_TX_OK;
 544 }
 545
 546 static irqreturn_t
 547 ether3_interrupt(int irq, void *dev_id)
 548 {
 549         struct net_device *dev = (struct net_device *)dev_id;
 550         unsigned int status, handled = IRQ_NONE;
 551
 552 #if NET_DEBUG > 1
 553         if(net_debug & DEBUG_INT)
 554                 printk("eth3irq: %d ", irq);
 555 #endif
 556
 557         status = ether3_inw(REG_STATUS);
 558
 559         if (status & STAT_INTRX) {
 560                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 561                 ether3_rx(dev, 12);
 562                 handled = IRQ_HANDLED;
 563         }
 564
 565         if (status & STAT_INTTX) {
 566                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 567                 ether3_tx(dev);
 568                 handled = IRQ_HANDLED;
 569         }
 570
 571 #if NET_DEBUG > 1
 572         if(net_debug & DEBUG_INT)
 573                 printk("done\n");
 574 #endif
 575         return handled;
 576 }
 577
 578 /*
 579  * If we have a good packet(s), get it/them out of the buffers.
 580  */
 581 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 582 {
 583         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 584
 585         ether3_ledon(dev);
 586
 587         do {
 588                 unsigned int this_ptr, status;
 589                 unsigned char addrs[16];
 590
 591                 /*
 592                  * read the first 16 bytes from the buffer.
 593                  * This contains the status bytes etc and ethernet addresses,
 594                  * and we also check the source ethernet address to see if
 595                  * it originated from us.
 596                  */
 597                 {
 598                         unsigned int temp_ptr;
 599                         ether3_setbuffer(dev, buffer_read, next_ptr);
 600                         temp_ptr = ether3_readword(dev);
 601                         status = ether3_readword(dev);
 602                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 603                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 604                                 break;
 605
 606                         this_ptr = next_ptr + 4;
 607                         next_ptr = ntohs(temp_ptr);
 608                 }
 609                 ether3_setbuffer(dev, buffer_read, this_ptr);
 610                 ether3_readbuffer(dev, addrs+2, 12);
 611
 612 if (next_ptr < RX_START || next_ptr >= RX_END) {
 613  int i;
 614  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 615  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 616  for (i = 2; i < 14; i++)
 617    printk("%02X ", addrs[i]);
 618  printk("\n");
 619  next_ptr = priv(dev)->rx_head;
 620  break;
 621 }
 622                 /*
 623                  * ignore our own packets...
 624                  */
 625                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 626                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 627                         maxcnt ++; /* compensate for loopedback packet */
 628                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 629                 } else
 630                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 631                         unsigned int length = next_ptr - this_ptr;
 632                         struct sk_buff *skb;
 633
 634                         if (next_ptr <= this_ptr)
 635                                 length += RX_END - RX_START;
 636
 637                         skb = netdev_alloc_skb(dev, length + 2);
 638                         if (skb) {
 639                                 unsigned char *buf;
 640
 641                                 skb_reserve(skb, 2);
 642                                 buf = skb_put(skb, length);
 643                                 ether3_readbuffer(dev, buf + 12, length - 12);
 644                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 645                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 646                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 647                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 648                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 649                                 skb->protocol = eth_type_trans(skb, dev);
 650                                 netif_rx(skb);
 651                                 received ++;
 652                         } else {
 653                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 654                                 dev->stats.rx_dropped++;
 655                                 goto done;
 656                         }
 657                 } else {
 658                         struct net_device_stats *stats = &dev->stats;
 659                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 660                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 661                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 662                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 663                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 664                         stats->rx_errors++;
 665                 }
 666         }
 667         while (-- maxcnt);
 668
 669 done:
 670         dev->stats.rx_packets += received;
 671         priv(dev)->rx_head = next_ptr;
 672         /*
 673          * If rx went off line, then that means that the buffer may be full.  We
 674          * have dropped at least one packet.
 675          */
 676         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 677                 dev->stats.rx_dropped++;
 678                 ether3_outw(next_ptr, REG_RECVPTR);
 679                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 680         }
 681
 682         return maxcnt;
 683 }
 684
 685 /*
 686  * Update stats for the transmitted packet(s)
 687  */
 688 static void ether3_tx(struct net_device *dev)
 689 {
 690         unsigned int tx_tail = priv(dev)->tx_tail;
 691         int max_work = 14;
 692
 693         do {
 694                 unsigned long status;
 695
 696                 /*
 697                  * Read the packet header
 698                  */
 699                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 700                 status = ether3_readlong(dev);
 701
 702                 /*
 703                  * Check to see if this packet has been transmitted
 704                  */
 705                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 706                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 707                         break;
 708
 709                 /*
 710                  * Update errors
 711                  */
 712                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 713                         dev->stats.tx_packets++;
 714                 else {
 715                         dev->stats.tx_errors++;
 716                         if (status & TXSTAT_16COLLISIONS)
 717                                 dev->stats.collisions += 16;
 718                         if (status & TXSTAT_BABBLED)
 719                                 dev->stats.tx_fifo_errors++;
 720                 }
 721
 722                 tx_tail = (tx_tail + 1) & 15;
 723         } while (--max_work);
 724
 725         if (priv(dev)->tx_tail != tx_tail) {
 726                 priv(dev)->tx_tail = tx_tail;
 727                 netif_wake_queue(dev);
 728         }
 729 }
 730
 731 static void ether3_banner(void)
 732 {
 733         static unsigned version_printed = 0;
 734
 735         if (net_debug && version_printed++ == 0)
 736                 printk(KERN_INFO "%s", version);
 737 }
 738
 739 static const struct net_device_ops ether3_netdev_ops = {
 740         .ndo_open               = ether3_open,
 741         .ndo_stop               = ether3_close,
 742         .ndo_start_xmit         = ether3_sendpacket,
 743         .ndo_set_rx_mode        = ether3_setmulticastlist,
 744         .ndo_tx_timeout         = ether3_timeout,
 745         .ndo_validate_addr      = eth_validate_addr,
 746         .ndo_set_mac_address    = eth_mac_addr,
 747 };
 748
 749 static int
 750 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 751 {
 752         const struct ether3_data *data = id->data;
 753         struct net_device *dev;
 754         int bus_type, ret;
 755
 756         ether3_banner();
 757
 758         ret = ecard_request_resources(ec);
 759         if (ret)
 760                 goto out;
 761
 762         dev = alloc_etherdev(sizeof(struct dev_priv));
 763         if (!dev) {
 764                 ret = -ENOMEM;
 765                 goto release;
 766         }
 767
 768         SET_NETDEV_DEV(dev, &ec->dev);
 769
 770         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 771         if (!priv(dev)->base) {
 772                 ret = -ENOMEM;
 773                 goto free;
 774         }
 775
 776         ec->irqaddr = priv(dev)->base + data->base_offset;
 777         ec->irqmask = 0xf0;
 778
 779         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 780         dev->irq = ec->irq;
 781
 782         ether3_addr(dev->dev_addr, ec);
 783
 784         priv(dev)->dev = dev;
 785         timer_setup(&priv(dev)->timer, ether3_ledoff, 0);
 786
 787         /* Reset card...
 788          */
 789         ether3_outb(0x80, REG_CONFIG2 + 4);
 790         bus_type = BUS_UNKNOWN;
 791         udelay(4);
 792
 793         /* Test using Receive Pointer (16-bit register) to find out
 794          * how the ether3 is connected to the bus...
 795          */
 796         if (ether3_probe_bus_8(dev, 0x100) &&
 797             ether3_probe_bus_8(dev, 0x201))
 798                 bus_type = BUS_8;
 799
 800         if (bus_type == BUS_UNKNOWN &&
 801             ether3_probe_bus_16(dev, 0x101) &&
 802             ether3_probe_bus_16(dev, 0x201))
 803                 bus_type = BUS_16;
 804
 805         switch (bus_type) {
 806         case BUS_UNKNOWN:
 807                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 808                 ret = -ENODEV;
 809                 goto free;
 810
 811         case BUS_8:
 812                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 813                         "8-bit card\n", dev->name, data->name);
 814                 ret = -ENODEV;
 815                 goto free;
 816
 817         default:
 818                 break;
 819         }
 820
 821         if (ether3_init_2(dev)) {
 822                 ret = -ENODEV;
 823                 goto free;
 824         }
 825
 826         dev->netdev_ops         = &ether3_netdev_ops;
 827         dev->watchdog_timeo     = 5 * HZ / 100;
 828
 829         ret = register_netdev(dev);
 830         if (ret)
 831                 goto free;
 832
 833         printk("%s: %s in slot %d, %pM\n",
 834                dev->name, data->name, ec->slot_no, dev->dev_addr);
 835
 836         ecard_set_drvdata(ec, dev);
 837         return 0;
 838
 839  free:
 840         free_netdev(dev);
 841  release:
 842         ecard_release_resources(ec);
 843  out:
 844         return ret;
 845 }
 846
 847 static void ether3_remove(struct expansion_card *ec)
 848 {
 849         struct net_device *dev = ecard_get_drvdata(ec);
 850
 851         ecard_set_drvdata(ec, NULL);
 852
 853         unregister_netdev(dev);
 854         free_netdev(dev);
 855         ecard_release_resources(ec);
 856 }
 857
 858 static struct ether3_data ether3 = {
 859         .name           = "ether3",
 860         .base_offset    = 0,
 861 };
 862
 863 static struct ether3_data etherb = {
 864         .name           = "etherb",
 865         .base_offset    = 0x800,
 866 };
 867
 868 static const struct ecard_id ether3_ids[] = {
 869         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 870         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 871         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 872         { 0xffff, 0xffff }
 873 };
 874
 875 static struct ecard_driver ether3_driver = {
 876         .probe          = ether3_probe,
 877         .remove         = ether3_remove,
 878         .id_table       = ether3_ids,
 879         .drv = {
 880                 .name   = "ether3",
 881         },
 882 };
 883
 884 static int __init ether3_init(void)
 885 {
 886         return ecard_register_driver(&ether3_driver);
 887 }
 888
 889 static void __exit ether3_exit(void)
 890 {
 891         ecard_remove_driver(&ether3_driver);
 892 }
 893
 894 module_init(ether3_init);
 895 module_exit(ether3_exit);
 896
 897 MODULE_LICENSE("GPL");