drivers/net/de620.c

   1 /*
   2  *      de620.c $Revision: 1.40 $ BETA
   3  *
   4  *
   5  *      Linux driver for the D-Link DE-620 Ethernet pocket adapter.
   6  *
   7  *      Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se>
   8  *
   9  *      Based on adapter information gathered from DOS packetdriver
  10  *      sources from D-Link Inc:  (Special thanks to Henry Ngai of D-Link.)
  11  *              Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992
  12  *              Copyright, 1988, Russell Nelson, Crynwr Software
  13  *
  14  *      Adapted to the sample network driver core for linux,
  15  *      written by: Donald Becker <becker@super.org>
  16  *              (Now at <becker@scyld.com>)
  17  *
  18  *      Valuable assistance from:
  19  *              J. Joshua Kopper <kopper@rtsg.mot.com>
  20  *              Olav Kvittem <Olav.Kvittem@uninett.no>
  21  *              Germano Caronni <caronni@nessie.cs.id.ethz.ch>
  22  *              Jeremy Fitzhardinge <jeremy@suite.sw.oz.au>
  23  *
  24  *****************************************************************************/
  25 /*
  26  *      This program is free software; you can redistribute it and/or modify
  27  *      it under the terms of the GNU General Public License as published by
  28  *      the Free Software Foundation; either version 2, or (at your option)
  29  *      any later version.
  30  *
  31  *      This program is distributed in the hope that it will be useful,
  32  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  33  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  34  *      GNU General Public License for more details.
  35  *
  36  *      You should have received a copy of the GNU General Public License
  37  *      along with this program; if not, write to the Free Software
  38  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  39  *
  40  *****************************************************************************/
  41 static const char version[] =
  42         "de620.c: $Revision: 1.40 $,  Bjorn Ekwall <bj0rn@blox.se>\n";
  43
  44 /***********************************************************************
  45  *
  46  * "Tuning" section.
  47  *
  48  * Compile-time options: (see below for descriptions)
  49  * -DDE620_IO=0x378     (lpt1)
  50  * -DDE620_IRQ=7        (lpt1)
  51  * -DDE602_DEBUG=...
  52  * -DSHUTDOWN_WHEN_LOST
  53  * -DCOUNT_LOOPS
  54  * -DLOWSPEED
  55  * -DREAD_DELAY
  56  * -DWRITE_DELAY
  57  */
  58
  59 /*
  60  * This driver assumes that the printer port is a "normal",
  61  * dumb, uni-directional port!
  62  * If your port is "fancy" in any way, please try to set it to "normal"
  63  * with your BIOS setup.  I have no access to machines with bi-directional
  64  * ports, so I can't test such a driver :-(
  65  * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
  66  *
  67  * There are some clones of DE620 out there, with different names.
  68  * If the current driver does not recognize a clone, try to change
  69  * the following #define to:
  70  *
  71  * #define DE620_CLONE 1
  72  */
  73 #define DE620_CLONE 0
  74
  75 /*
  76  * If the adapter has problems with high speeds, enable this #define
  77  * otherwise full printerport speed will be attempted.
  78  *
  79  * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
  80  *
  81 #define LOWSPEED
  82  */
  83
  84 #ifndef READ_DELAY
  85 #define READ_DELAY 100  /* adapter internal read delay in 100ns units */
  86 #endif
  87
  88 #ifndef WRITE_DELAY
  89 #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */
  90 #endif
  91
  92 /*
  93  * Enable this #define if you want the adapter to do a "ifconfig down" on
  94  * itself when we have detected that something is possibly wrong with it.
  95  * The default behaviour is to retry with "adapter_init()" until success.
  96  * This should be used for debugging purposes only.
  97  *
  98 #define SHUTDOWN_WHEN_LOST
  99  */
 100
 101 /*
 102  * Enable debugging by "-DDE620_DEBUG=3" when compiling,
 103  * OR by enabling the following #define
 104  *
 105  * use 0 for production, 1 for verification, >2 for debug
 106  *
 107 #define DE620_DEBUG 3
 108  */
 109
 110 #ifdef LOWSPEED
 111 /*
 112  * Enable this #define if you want to see debugging output that show how long
 113  * we have to wait before the DE-620 is ready for the next read/write/command.
 114  *
 115 #define COUNT_LOOPS
 116  */
 117 #endif
 118
 119 #include <linux/module.h>
 120 #include <linux/kernel.h>
 121 #include <linux/types.h>
 122 #include <linux/fcntl.h>
 123 #include <linux/string.h>
 124 #include <linux/interrupt.h>
 125 #include <linux/ioport.h>
 126 #include <linux/in.h>
 127 #include <linux/errno.h>
 128 #include <linux/init.h>
 129 #include <linux/inet.h>
 130 #include <linux/netdevice.h>
 131 #include <linux/etherdevice.h>
 132 #include <linux/skbuff.h>
 133
 134 #include <asm/io.h>
 135 #include <asm/system.h>
 136
 137 /* Constant definitions for the DE-620 registers, commands and bits */
 138 #include "de620.h"
 139
 140 typedef unsigned char byte;
 141
 142 /*******************************************************
 143  *                                                     *
 144  * Definition of D-Link DE-620 Ethernet Pocket adapter *
 145  * See also "de620.h"                                  *
 146  *                                                     *
 147  *******************************************************/
 148 #ifndef DE620_IO /* Compile-time configurable */
 149 #define DE620_IO 0x378
 150 #endif
 151
 152 #ifndef DE620_IRQ /* Compile-time configurable */
 153 #define DE620_IRQ       7
 154 #endif
 155
 156 #define DATA_PORT       (dev->base_addr)
 157 #define STATUS_PORT     (dev->base_addr + 1)
 158 #define COMMAND_PORT    (dev->base_addr + 2)
 159
 160 #define RUNT 60         /* Too small Ethernet packet */
 161 #define GIANT 1514      /* largest legal size packet, no fcs */
 162
 163 #ifdef DE620_DEBUG /* Compile-time configurable */
 164 #define PRINTK(x) if (de620_debug >= 2) printk x
 165 #else
 166 #define DE620_DEBUG 0
 167 #define PRINTK(x) /**/
 168 #endif
 169
 170
 171 /*
 172  * Force media with insmod:
 173  *      insmod de620.o bnc=1
 174  * or
 175  *      insmod de620.o utp=1
 176  *
 177  * Force io and/or irq with insmod:
 178  *      insmod de620.o io=0x378 irq=7
 179  *
 180  * Make a clone skip the Ethernet-address range check:
 181  *      insmod de620.o clone=1
 182  */
 183 static int bnc;
 184 static int utp;
 185 static int io  = DE620_IO;
 186 static int irq = DE620_IRQ;
 187 static int clone = DE620_CLONE;
 188
 189 static unsigned int de620_debug = DE620_DEBUG;
 190
 191 static spinlock_t de620_lock;
 192
 193 module_param(bnc, int, 0);
 194 module_param(utp, int, 0);
 195 module_param(io, int, 0);
 196 module_param(irq, int, 0);
 197 module_param(clone, int, 0);
 198 module_param(de620_debug, int, 0);
 199 MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
 200 MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
 201 MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
 202 MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
 203 MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
 204 MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)");
 205
 206 /***********************************************
 207  *                                             *
 208  * Index to functions, as function prototypes. *
 209  *                                             *
 210  ***********************************************/
 211
 212 /*
 213  * Routines used internally. (See also "convenience macros.. below")
 214  */
 215
 216 /* Put in the device structure. */
 217 static int      de620_open(struct net_device *);
 218 static int      de620_close(struct net_device *);
 219 static struct   net_device_stats *get_stats(struct net_device *);
 220 static void     de620_set_multicast_list(struct net_device *);
 221 static int      de620_start_xmit(struct sk_buff *, struct net_device *);
 222
 223 /* Dispatch from interrupts. */
 224 static irqreturn_t de620_interrupt(int, void *);
 225 static int      de620_rx_intr(struct net_device *);
 226
 227 /* Initialization */
 228 static int      adapter_init(struct net_device *);
 229 static int      read_eeprom(struct net_device *);
 230
 231
 232 /*
 233  * D-Link driver variables:
 234  */
 235 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
 236 #define TCR_DEF RXPB                    /* not used: | TXSUCINT | T16INT */
 237 #define DE620_RX_START_PAGE 12          /* 12 pages (=3k) reserved for tx */
 238 #define DEF_NIC_CMD IRQEN | ICEN | DS1
 239
 240 static volatile byte    NIC_Cmd;
 241 static volatile byte    next_rx_page;
 242 static byte             first_rx_page;
 243 static byte             last_rx_page;
 244 static byte             EIPRegister;
 245
 246 static struct nic {
 247         byte    NodeID[6];
 248         byte    RAM_Size;
 249         byte    Model;
 250         byte    Media;
 251         byte    SCR;
 252 } nic_data;
 253
 254 /**********************************************************
 255  *                                                        *
 256  * Convenience macros/functions for D-Link DE-620 adapter *
 257  *                                                        *
 258  **********************************************************/
 259 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
 260 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
 261
 262 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
 263 #ifdef COUNT_LOOPS
 264 static int tot_cnt;
 265 #endif
 266 static inline byte
 267 de620_ready(struct net_device *dev)
 268 {
 269         byte value;
 270         register short int cnt = 0;
 271
 272         while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
 273                 ++cnt;
 274
 275 #ifdef COUNT_LOOPS
 276         tot_cnt += cnt;
 277 #endif
 278         return value & 0xf0; /* nibble */
 279 }
 280
 281 static inline void
 282 de620_send_command(struct net_device *dev, byte cmd)
 283 {
 284         de620_ready(dev);
 285         if (cmd == W_DUMMY)
 286                 outb(NIC_Cmd, COMMAND_PORT);
 287
 288         outb(cmd, DATA_PORT);
 289
 290         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 291         de620_ready(dev);
 292         outb(NIC_Cmd, COMMAND_PORT);
 293 }
 294
 295 static inline void
 296 de620_put_byte(struct net_device *dev, byte value)
 297 {
 298         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 299         de620_ready(dev);
 300         outb(value, DATA_PORT);
 301         de620_flip_ds(dev);
 302 }
 303
 304 static inline byte
 305 de620_read_byte(struct net_device *dev)
 306 {
 307         byte value;
 308
 309         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 310         value = de620_ready(dev); /* High nibble */
 311         de620_flip_ds(dev);
 312         value |= de620_ready(dev) >> 4; /* Low nibble */
 313         return value;
 314 }
 315
 316 static inline void
 317 de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
 318 {
 319 #ifndef LOWSPEED
 320         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 321         byte dflip = NIC_Cmd;
 322 #else /* LOWSPEED */
 323 #ifdef COUNT_LOOPS
 324         int bytes = count;
 325 #endif /* COUNT_LOOPS */
 326 #endif /* LOWSPEED */
 327
 328 #ifdef LOWSPEED
 329 #ifdef COUNT_LOOPS
 330         tot_cnt = 0;
 331 #endif /* COUNT_LOOPS */
 332         /* No further optimization useful, the limit is in the adapter. */
 333         for ( ; count > 0; --count, ++buffer) {
 334                 de620_put_byte(dev,*buffer);
 335         }
 336         for ( count = pad ; count > 0; --count, ++buffer) {
 337                 de620_put_byte(dev, 0);
 338         }
 339         de620_send_command(dev,W_DUMMY);
 340 #ifdef COUNT_LOOPS
 341         /* trial debug output: loops per byte in de620_ready() */
 342         printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
 343 #endif /* COUNT_LOOPS */
 344 #else /* not LOWSPEED */
 345         for ( ; count > 0; count -=2) {
 346                 outb(*buffer++, DATA_PORT);
 347                 outb(uflip, COMMAND_PORT);
 348                 outb(*buffer++, DATA_PORT);
 349                 outb(dflip, COMMAND_PORT);
 350         }
 351         de620_send_command(dev,W_DUMMY);
 352 #endif /* LOWSPEED */
 353 }
 354
 355 static inline void
 356 de620_read_block(struct net_device *dev, byte *data, int count)
 357 {
 358 #ifndef LOWSPEED
 359         byte value;
 360         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 361         byte dflip = NIC_Cmd;
 362 #else /* LOWSPEED */
 363 #ifdef COUNT_LOOPS
 364         int bytes = count;
 365
 366         tot_cnt = 0;
 367 #endif /* COUNT_LOOPS */
 368 #endif /* LOWSPEED */
 369
 370 #ifdef LOWSPEED
 371         /* No further optimization useful, the limit is in the adapter. */
 372         while (count-- > 0) {
 373                 *data++ = de620_read_byte(dev);
 374                 de620_flip_ds(dev);
 375         }
 376 #ifdef COUNT_LOOPS
 377         /* trial debug output: loops per byte in de620_ready() */
 378         printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
 379 #endif /* COUNT_LOOPS */
 380 #else /* not LOWSPEED */
 381         while (count-- > 0) {
 382                 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
 383                 outb(uflip, COMMAND_PORT);
 384                 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
 385                 outb(dflip , COMMAND_PORT);
 386         }
 387 #endif /* LOWSPEED */
 388 }
 389
 390 static inline void
 391 de620_set_delay(struct net_device *dev)
 392 {
 393         de620_ready(dev);
 394         outb(W_DFR, DATA_PORT);
 395         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 396
 397         de620_ready(dev);
 398 #ifdef LOWSPEED
 399         outb(WRITE_DELAY, DATA_PORT);
 400 #else
 401         outb(0, DATA_PORT);
 402 #endif
 403         de620_flip_ds(dev);
 404
 405         de620_ready(dev);
 406 #ifdef LOWSPEED
 407         outb(READ_DELAY, DATA_PORT);
 408 #else
 409         outb(0, DATA_PORT);
 410 #endif
 411         de620_flip_ds(dev);
 412 }
 413
 414 static inline void
 415 de620_set_register(struct net_device *dev, byte reg, byte value)
 416 {
 417         de620_ready(dev);
 418         outb(reg, DATA_PORT);
 419         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 420
 421         de620_put_byte(dev, value);
 422 }
 423
 424 static inline byte
 425 de620_get_register(struct net_device *dev, byte reg)
 426 {
 427         byte value;
 428
 429         de620_send_command(dev,reg);
 430         value = de620_read_byte(dev);
 431         de620_send_command(dev,W_DUMMY);
 432
 433         return value;
 434 }
 435
 436 /*********************************************************************
 437  *
 438  * Open/initialize the board.
 439  *
 440  * This routine should set everything up anew at each open, even
 441  * registers that "should" only need to be set once at boot, so that
 442  * there is a non-reboot way to recover if something goes wrong.
 443  *
 444  */
 445 static int de620_open(struct net_device *dev)
 446 {
 447         int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
 448         if (ret) {
 449                 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
 450                 return ret;
 451         }
 452
 453         if (adapter_init(dev)) {
 454                 ret = -EIO;
 455                 goto out_free_irq;
 456         }
 457
 458         netif_start_queue(dev);
 459         return 0;
 460
 461 out_free_irq:
 462         free_irq(dev->irq, dev);
 463         return ret;
 464 }
 465
 466 /************************************************
 467  *
 468  * The inverse routine to de620_open().
 469  *
 470  */
 471
 472 static int de620_close(struct net_device *dev)
 473 {
 474         netif_stop_queue(dev);
 475         /* disable recv */
 476         de620_set_register(dev, W_TCR, RXOFF);
 477         free_irq(dev->irq, dev);
 478         return 0;
 479 }
 480
 481 /*********************************************
 482  *
 483  * Return current statistics
 484  *
 485  */
 486 static struct net_device_stats *get_stats(struct net_device *dev)
 487 {
 488         return (struct net_device_stats *)(dev->priv);
 489 }
 490
 491 /*********************************************
 492  *
 493  * Set or clear the multicast filter for this adaptor.
 494  * (no real multicast implemented for the DE-620, but she can be promiscuous...)
 495  *
 496  */
 497
 498 static void de620_set_multicast_list(struct net_device *dev)
 499 {
 500         if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
 501         { /* Enable promiscuous mode */
 502                 /*
 503                  *      We must make the kernel realise we had to move
 504                  *      into promisc mode or we start all out war on
 505                  *      the cable. - AC
 506                  */
 507                 dev->flags|=IFF_PROMISC;
 508
 509                 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
 510         }
 511         else
 512         { /* Disable promiscuous mode, use normal mode */
 513                 de620_set_register(dev, W_TCR, TCR_DEF);
 514         }
 515 }
 516
 517 /*******************************************************
 518  *
 519  * Handle timeouts on transmit
 520  */
 521
 522 static void de620_timeout(struct net_device *dev)
 523 {
 524         printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
 525         /* Restart the adapter. */
 526         if (!adapter_init(dev)) /* maybe close it */
 527                 netif_wake_queue(dev);
 528 }
 529
 530 /*******************************************************
 531  *
 532  * Copy a buffer to the adapter transmit page memory.
 533  * Start sending.
 534  */
 535 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
 536 {
 537         unsigned long flags;
 538         int len;
 539         byte *buffer = skb->data;
 540         byte using_txbuf;
 541
 542         using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
 543
 544         netif_stop_queue(dev);
 545
 546
 547         if ((len = skb->len) < RUNT)
 548                 len = RUNT;
 549         if (len & 1) /* send an even number of bytes */
 550                 ++len;
 551
 552         /* Start real output */
 553
 554         spin_lock_irqsave(&de620_lock, flags)
 555         PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
 556                 (int)skb->len, using_txbuf));
 557
 558         /* select a free tx buffer. if there is one... */
 559         switch (using_txbuf) {
 560         default: /* both are free: use TXBF0 */
 561         case TXBF1: /* use TXBF0 */
 562                 de620_send_command(dev,W_CR | RW0);
 563                 using_txbuf |= TXBF0;
 564                 break;
 565
 566         case TXBF0: /* use TXBF1 */
 567                 de620_send_command(dev,W_CR | RW1);
 568                 using_txbuf |= TXBF1;
 569                 break;
 570
 571         case (TXBF0 | TXBF1): /* NONE!!! */
 572                 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
 573                 spin_unlock_irqrestore(&de620_lock, flags);
 574                 return 1;
 575         }
 576         de620_write_block(dev, buffer, skb->len, len-skb->len);
 577
 578         dev->trans_start = jiffies;
 579         if(!(using_txbuf == (TXBF0 | TXBF1)))
 580                 netif_wake_queue(dev);
 581
 582         ((struct net_device_stats *)(dev->priv))->tx_packets++;
 583         spin_unlock_irqrestore(&de620_lock, flags);
 584         dev_kfree_skb (skb);
 585         return 0;
 586 }
 587
 588 /*****************************************************
 589  *
 590  * Handle the network interface interrupts.
 591  *
 592  */
 593 static irqreturn_t
 594 de620_interrupt(int irq_in, void *dev_id)
 595 {
 596         struct net_device *dev = dev_id;
 597         byte irq_status;
 598         int bogus_count = 0;
 599         int again = 0;
 600
 601         spin_lock(&de620_lock);
 602
 603         /* Read the status register (_not_ the status port) */
 604         irq_status = de620_get_register(dev, R_STS);
 605
 606         PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
 607
 608         if (irq_status & RXGOOD) {
 609                 do {
 610                         again = de620_rx_intr(dev);
 611                         PRINTK(("again=%d\n", again));
 612                 }
 613                 while (again && (++bogus_count < 100));
 614         }
 615
 616         if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
 617                 netif_wake_queue(dev);
 618
 619         spin_unlock(&de620_lock);
 620         return IRQ_HANDLED;
 621 }
 622
 623 /**************************************
 624  *
 625  * Get a packet from the adapter
 626  *
 627  * Send it "upstairs"
 628  *
 629  */
 630 static int de620_rx_intr(struct net_device *dev)
 631 {
 632         struct header_buf {
 633                 byte            status;
 634                 byte            Rx_NextPage;
 635                 unsigned short  Rx_ByteCount;
 636         } header_buf;
 637         struct sk_buff *skb;
 638         int size;
 639         byte *buffer;
 640         byte pagelink;
 641         byte curr_page;
 642
 643         PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
 644
 645         /* Tell the adapter that we are going to read data, and from where */
 646         de620_send_command(dev, W_CR | RRN);
 647         de620_set_register(dev, W_RSA1, next_rx_page);
 648         de620_set_register(dev, W_RSA0, 0);
 649
 650         /* Deep breath, and away we goooooo */
 651         de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
 652         PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
 653         header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
 654
 655         /* Plausible page header? */
 656         pagelink = header_buf.Rx_NextPage;
 657         if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
 658                 /* Ouch... Forget it! Skip all and start afresh... */
 659                 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
 660                 /* You win some, you lose some. And sometimes plenty... */
 661                 adapter_init(dev);
 662                 netif_wake_queue(dev);
 663                 ((struct net_device_stats *)(dev->priv))->rx_over_errors++;
 664                 return 0;
 665         }
 666
 667         /* OK, this look good, so far. Let's see if it's consistent... */
 668         /* Let's compute the start of the next packet, based on where we are */
 669         pagelink = next_rx_page +
 670                 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
 671
 672         /* Are we going to wrap around the page counter? */
 673         if (pagelink > last_rx_page)
 674                 pagelink -= (last_rx_page - first_rx_page + 1);
 675
 676         /* Is the _computed_ next page number equal to what the adapter says? */
 677         if (pagelink != header_buf.Rx_NextPage) {
 678                 /* Naah, we'll skip this packet. Probably bogus data as well */
 679                 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
 680                 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
 681                 de620_send_command(dev, W_DUMMY);
 682                 de620_set_register(dev, W_NPRF, next_rx_page);
 683                 ((struct net_device_stats *)(dev->priv))->rx_over_errors++;
 684                 return 0;
 685         }
 686         next_rx_page = pagelink;
 687
 688         size = header_buf.Rx_ByteCount - 4;
 689         if ((size < RUNT) || (GIANT < size)) {
 690                 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
 691         }
 692         else { /* Good packet? */
 693                 skb = dev_alloc_skb(size+2);
 694                 if (skb == NULL) { /* Yeah, but no place to put it... */
 695                         printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 696                         ((struct net_device_stats *)(dev->priv))->rx_dropped++;
 697                 }
 698                 else { /* Yep! Go get it! */
 699                         skb_reserve(skb,2);     /* Align */
 700                         skb->dev = dev;
 701                         /* skb->data points to the start of sk_buff data area */
 702                         buffer = skb_put(skb,size);
 703                         /* copy the packet into the buffer */
 704                         de620_read_block(dev, buffer, size);
 705                         PRINTK(("Read %d bytes\n", size));
 706                         skb->protocol=eth_type_trans(skb,dev);
 707                         netif_rx(skb); /* deliver it "upstairs" */
 708                         dev->last_rx = jiffies;
 709                         /* count all receives */
 710                         ((struct net_device_stats *)(dev->priv))->rx_packets++;
 711                         ((struct net_device_stats *)(dev->priv))->rx_bytes += size;
 712                 }
 713         }
 714
 715         /* Let's peek ahead to see if we have read the last current packet */
 716         /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
 717         curr_page = de620_get_register(dev, R_CPR);
 718         de620_set_register(dev, W_NPRF, next_rx_page);
 719         PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
 720
 721         return (next_rx_page != curr_page); /* That was slightly tricky... */
 722 }
 723
 724 /*********************************************
 725  *
 726  * Reset the adapter to a known state
 727  *
 728  */
 729 static int adapter_init(struct net_device *dev)
 730 {
 731         int i;
 732         static int was_down;
 733
 734         if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
 735                 EIPRegister = NCTL0;
 736                 if (nic_data.Media != 1)
 737                         EIPRegister |= NIS0;    /* not BNC */
 738         }
 739         else if (nic_data.Model == 2) { /* UTP */
 740                 EIPRegister = NCTL0 | NIS0;
 741         }
 742
 743         if (utp)
 744                 EIPRegister = NCTL0 | NIS0;
 745         if (bnc)
 746                 EIPRegister = NCTL0;
 747
 748         de620_send_command(dev, W_CR | RNOP | CLEAR);
 749         de620_send_command(dev, W_CR | RNOP);
 750
 751         de620_set_register(dev, W_SCR, SCR_DEF);
 752         /* disable recv to wait init */
 753         de620_set_register(dev, W_TCR, RXOFF);
 754
 755         /* Set the node ID in the adapter */
 756         for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
 757                 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
 758         }
 759
 760         de620_set_register(dev, W_EIP, EIPRegister);
 761
 762         next_rx_page = first_rx_page = DE620_RX_START_PAGE;
 763         if (nic_data.RAM_Size)
 764                 last_rx_page = nic_data.RAM_Size - 1;
 765         else /* 64k RAM */
 766                 last_rx_page = 255;
 767
 768         de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
 769         de620_set_register(dev, W_EPR, last_rx_page);  /* End Page Register */
 770         de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
 771         de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
 772         de620_send_command(dev, W_DUMMY);
 773         de620_set_delay(dev);
 774
 775         /* Final sanity check: Anybody out there? */
 776         /* Let's hope some bits from the statusregister make a good check */
 777 #define CHECK_MASK (  0 | TXSUC |  T16  |  0  | RXCRC | RXSHORT |  0  |  0  )
 778 #define CHECK_OK   (  0 |   0   |  0    |  0  |   0   |   0     |  0  |  0  )
 779         /* success:   X     0      0       X      0       0        X     X  */
 780         /* ignore:   EEDI                RXGOOD                   COLS  LNKS*/
 781
 782         if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
 783                 printk(KERN_ERR "%s: Something has happened to the DE-620!  Please check it"
 784 #ifdef SHUTDOWN_WHEN_LOST
 785                         " and do a new ifconfig"
 786 #endif
 787                         "! (%02x)\n", dev->name, i);
 788 #ifdef SHUTDOWN_WHEN_LOST
 789                 /* Goodbye, cruel world... */
 790                 dev->flags &= ~IFF_UP;
 791                 de620_close(dev);
 792 #endif
 793                 was_down = 1;
 794                 return 1; /* failed */
 795         }
 796         if (was_down) {
 797                 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
 798                 was_down = 0;
 799         }
 800
 801         /* All OK, go ahead... */
 802         de620_set_register(dev, W_TCR, TCR_DEF);
 803
 804         return 0; /* all ok */
 805 }
 806
 807 /******************************************************************************
 808  *
 809  * Only start-up code below
 810  *
 811  */
 812 /****************************************
 813  *
 814  * Check if there is a DE-620 connected
 815  */
 816 struct net_device * __init de620_probe(int unit)
 817 {
 818         byte checkbyte = 0xa5;
 819         struct net_device *dev;
 820         int err = -ENOMEM;
 821         int i;
 822
 823         dev = alloc_etherdev(sizeof(struct net_device_stats));
 824         if (!dev)
 825                 goto out;
 826
 827         SET_MODULE_OWNER(dev);
 828
 829         spin_lock_init(&de620_lock);
 830
 831         /*
 832          * This is where the base_addr and irq gets set.
 833          * Tunable at compile-time and insmod-time
 834          */
 835         dev->base_addr = io;
 836         dev->irq       = irq;
 837
 838         /* allow overriding parameters on command line */
 839         if (unit >= 0) {
 840                 sprintf(dev->name, "eth%d", unit);
 841                 netdev_boot_setup_check(dev);
 842         }
 843
 844         if (de620_debug)
 845                 printk(version);
 846
 847         printk(KERN_INFO "D-Link DE-620 pocket adapter");
 848
 849         if (!request_region(dev->base_addr, 3, "de620")) {
 850                 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
 851                 err = -EBUSY;
 852                 goto out1;
 853         }
 854
 855         /* Initially, configure basic nibble mode, so we can read the EEPROM */
 856         NIC_Cmd = DEF_NIC_CMD;
 857         de620_set_register(dev, W_EIP, EIPRegister);
 858
 859         /* Anybody out there? */
 860         de620_set_register(dev, W_CPR, checkbyte);
 861         checkbyte = de620_get_register(dev, R_CPR);
 862
 863         if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
 864                 printk(" not identified in the printer port\n");
 865                 err = -ENODEV;
 866                 goto out2;
 867         }
 868
 869         /* else, got it! */
 870         printk(", Ethernet Address: %2.2X",
 871                 dev->dev_addr[0] = nic_data.NodeID[0]);
 872         for (i = 1; i < ETH_ALEN; i++) {
 873                 printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
 874                 dev->broadcast[i] = 0xff;
 875         }
 876
 877         printk(" (%dk RAM,",
 878                 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
 879
 880         if (nic_data.Media == 1)
 881                 printk(" BNC)\n");
 882         else
 883                 printk(" UTP)\n");
 884
 885         dev->get_stats          = get_stats;
 886         dev->open               = de620_open;
 887         dev->stop               = de620_close;
 888         dev->hard_start_xmit    = de620_start_xmit;
 889         dev->tx_timeout         = de620_timeout;
 890         dev->watchdog_timeo     = HZ*2;
 891         dev->set_multicast_list = de620_set_multicast_list;
 892
 893         /* base_addr and irq are already set, see above! */
 894
 895         /* dump eeprom */
 896         if (de620_debug) {
 897                 printk("\nEEPROM contents:\n");
 898                 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
 899                 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
 900                         nic_data.NodeID[0], nic_data.NodeID[1],
 901                         nic_data.NodeID[2], nic_data.NodeID[3],
 902                         nic_data.NodeID[4], nic_data.NodeID[5]);
 903                 printk("Model = %d\n", nic_data.Model);
 904                 printk("Media = %d\n", nic_data.Media);
 905                 printk("SCR = 0x%02x\n", nic_data.SCR);
 906         }
 907
 908         err = register_netdev(dev);
 909         if (err)
 910                 goto out2;
 911         return dev;
 912
 913 out2:
 914         release_region(dev->base_addr, 3);
 915 out1:
 916         free_netdev(dev);
 917 out:
 918         return ERR_PTR(err);
 919 }
 920
 921 /**********************************
 922  *
 923  * Read info from on-board EEPROM
 924  *
 925  * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
 926  */
 927 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
 928
 929 static unsigned short __init ReadAWord(struct net_device *dev, int from)
 930 {
 931         unsigned short data;
 932         int nbits;
 933
 934         /* cs   [__~~] SET SEND STATE */
 935         /* di   [____]                */
 936         /* sck  [_~~_]                */
 937         sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
 938
 939         /* Send the 9-bit address from where we want to read the 16-bit word */
 940         for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
 941                 if (from & 0x0100) { /* bit set? */
 942                         /* cs    [~~~~] SEND 1 */
 943                         /* di    [~~~~]        */
 944                         /* sck   [_~~_]        */
 945                         sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
 946                 }
 947                 else {
 948                         /* cs    [~~~~] SEND 0 */
 949                         /* di    [____]        */
 950                         /* sck   [_~~_]        */
 951                         sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 952                 }
 953         }
 954
 955         /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
 956         for (data = 0, nbits = 16; nbits > 0; --nbits) {
 957                 /* cs    [~~~~] SEND 0 */
 958                 /* di    [____]        */
 959                 /* sck   [_~~_]        */
 960                 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 961                 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
 962         }
 963         /* cs    [____] RESET SEND STATE */
 964         /* di    [____]                  */
 965         /* sck   [_~~_]                  */
 966         sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
 967
 968         return data;
 969 }
 970
 971 static int __init read_eeprom(struct net_device *dev)
 972 {
 973         unsigned short wrd;
 974
 975         /* D-Link Ethernet addresses are in the series  00:80:c8:7X:XX:XX:XX */
 976         wrd = ReadAWord(dev, 0x1aa);    /* bytes 0 + 1 of NodeID */
 977         if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
 978                 return -1; /* Nope, not a DE-620 */
 979         nic_data.NodeID[0] = wrd & 0xff;
 980         nic_data.NodeID[1] = wrd >> 8;
 981
 982         wrd = ReadAWord(dev, 0x1ab);    /* bytes 2 + 3 of NodeID */
 983         if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
 984                 return -1; /* Nope, not a DE-620 */
 985         nic_data.NodeID[2] = wrd & 0xff;
 986         nic_data.NodeID[3] = wrd >> 8;
 987
 988         wrd = ReadAWord(dev, 0x1ac);    /* bytes 4 + 5 of NodeID */
 989         nic_data.NodeID[4] = wrd & 0xff;
 990         nic_data.NodeID[5] = wrd >> 8;
 991
 992         wrd = ReadAWord(dev, 0x1ad);    /* RAM size in pages (256 bytes). 0 = 64k */
 993         nic_data.RAM_Size = (wrd >> 8);
 994
 995         wrd = ReadAWord(dev, 0x1ae);    /* hardware model (CT = 3) */
 996         nic_data.Model = (wrd & 0xff);
 997
 998         wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
 999         nic_data.Media = (wrd & 0xff);
1000
1001         wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
1002         nic_data.SCR = (wrd >> 8);
1003
1004         return 0; /* no errors */
1005 }
1006
1007 /******************************************************************************
1008  *
1009  * Loadable module skeleton
1010  *
1011  */
1012 #ifdef MODULE
1013 static struct net_device *de620_dev;
1014
1015 int __init init_module(void)
1016 {
1017         de620_dev = de620_probe(-1);
1018         if (IS_ERR(de620_dev))
1019                 return PTR_ERR(de620_dev);
1020         return 0;
1021 }
1022
1023 void cleanup_module(void)
1024 {
1025         unregister_netdev(de620_dev);
1026         release_region(de620_dev->base_addr, 3);
1027         free_netdev(de620_dev);
1028 }
1029 #endif /* MODULE */
1030 MODULE_LICENSE("GPL");
1031
1032
1033 /*
1034  * (add '-DMODULE' when compiling as loadable module)
1035  *
1036  * compile-command:
1037  *      gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1038  *       -fomit-frame-pointer -m486 \
1039  *      -I/usr/src/linux/include -I../../net/inet -c de620.c
1040 */
1041 /*
1042  * Local variables:
1043  *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1044  *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1045  *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1046  * End:
1047  */