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 void     de620_set_multicast_list(struct net_device *);
 220 static int      de620_start_xmit(struct sk_buff *, struct net_device *);
 221
 222 /* Dispatch from interrupts. */
 223 static irqreturn_t de620_interrupt(int, void *);
 224 static int      de620_rx_intr(struct net_device *);
 225
 226 /* Initialization */
 227 static int      adapter_init(struct net_device *);
 228 static int      read_eeprom(struct net_device *);
 229
 230
 231 /*
 232  * D-Link driver variables:
 233  */
 234 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
 235 #define TCR_DEF RXPB                    /* not used: | TXSUCINT | T16INT */
 236 #define DE620_RX_START_PAGE 12          /* 12 pages (=3k) reserved for tx */
 237 #define DEF_NIC_CMD IRQEN | ICEN | DS1
 238
 239 static volatile byte    NIC_Cmd;
 240 static volatile byte    next_rx_page;
 241 static byte             first_rx_page;
 242 static byte             last_rx_page;
 243 static byte             EIPRegister;
 244
 245 static struct nic {
 246         byte    NodeID[6];
 247         byte    RAM_Size;
 248         byte    Model;
 249         byte    Media;
 250         byte    SCR;
 251 } nic_data;
 252
 253 /**********************************************************
 254  *                                                        *
 255  * Convenience macros/functions for D-Link DE-620 adapter *
 256  *                                                        *
 257  **********************************************************/
 258 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
 259 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
 260
 261 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
 262 #ifdef COUNT_LOOPS
 263 static int tot_cnt;
 264 #endif
 265 static inline byte
 266 de620_ready(struct net_device *dev)
 267 {
 268         byte value;
 269         register short int cnt = 0;
 270
 271         while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
 272                 ++cnt;
 273
 274 #ifdef COUNT_LOOPS
 275         tot_cnt += cnt;
 276 #endif
 277         return value & 0xf0; /* nibble */
 278 }
 279
 280 static inline void
 281 de620_send_command(struct net_device *dev, byte cmd)
 282 {
 283         de620_ready(dev);
 284         if (cmd == W_DUMMY)
 285                 outb(NIC_Cmd, COMMAND_PORT);
 286
 287         outb(cmd, DATA_PORT);
 288
 289         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 290         de620_ready(dev);
 291         outb(NIC_Cmd, COMMAND_PORT);
 292 }
 293
 294 static inline void
 295 de620_put_byte(struct net_device *dev, byte value)
 296 {
 297         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 298         de620_ready(dev);
 299         outb(value, DATA_PORT);
 300         de620_flip_ds(dev);
 301 }
 302
 303 static inline byte
 304 de620_read_byte(struct net_device *dev)
 305 {
 306         byte value;
 307
 308         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 309         value = de620_ready(dev); /* High nibble */
 310         de620_flip_ds(dev);
 311         value |= de620_ready(dev) >> 4; /* Low nibble */
 312         return value;
 313 }
 314
 315 static inline void
 316 de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
 317 {
 318 #ifndef LOWSPEED
 319         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 320         byte dflip = NIC_Cmd;
 321 #else /* LOWSPEED */
 322 #ifdef COUNT_LOOPS
 323         int bytes = count;
 324 #endif /* COUNT_LOOPS */
 325 #endif /* LOWSPEED */
 326
 327 #ifdef LOWSPEED
 328 #ifdef COUNT_LOOPS
 329         tot_cnt = 0;
 330 #endif /* COUNT_LOOPS */
 331         /* No further optimization useful, the limit is in the adapter. */
 332         for ( ; count > 0; --count, ++buffer) {
 333                 de620_put_byte(dev,*buffer);
 334         }
 335         for ( count = pad ; count > 0; --count, ++buffer) {
 336                 de620_put_byte(dev, 0);
 337         }
 338         de620_send_command(dev,W_DUMMY);
 339 #ifdef COUNT_LOOPS
 340         /* trial debug output: loops per byte in de620_ready() */
 341         printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
 342 #endif /* COUNT_LOOPS */
 343 #else /* not LOWSPEED */
 344         for ( ; count > 0; count -=2) {
 345                 outb(*buffer++, DATA_PORT);
 346                 outb(uflip, COMMAND_PORT);
 347                 outb(*buffer++, DATA_PORT);
 348                 outb(dflip, COMMAND_PORT);
 349         }
 350         de620_send_command(dev,W_DUMMY);
 351 #endif /* LOWSPEED */
 352 }
 353
 354 static inline void
 355 de620_read_block(struct net_device *dev, byte *data, int count)
 356 {
 357 #ifndef LOWSPEED
 358         byte value;
 359         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 360         byte dflip = NIC_Cmd;
 361 #else /* LOWSPEED */
 362 #ifdef COUNT_LOOPS
 363         int bytes = count;
 364
 365         tot_cnt = 0;
 366 #endif /* COUNT_LOOPS */
 367 #endif /* LOWSPEED */
 368
 369 #ifdef LOWSPEED
 370         /* No further optimization useful, the limit is in the adapter. */
 371         while (count-- > 0) {
 372                 *data++ = de620_read_byte(dev);
 373                 de620_flip_ds(dev);
 374         }
 375 #ifdef COUNT_LOOPS
 376         /* trial debug output: loops per byte in de620_ready() */
 377         printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
 378 #endif /* COUNT_LOOPS */
 379 #else /* not LOWSPEED */
 380         while (count-- > 0) {
 381                 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
 382                 outb(uflip, COMMAND_PORT);
 383                 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
 384                 outb(dflip , COMMAND_PORT);
 385         }
 386 #endif /* LOWSPEED */
 387 }
 388
 389 static inline void
 390 de620_set_delay(struct net_device *dev)
 391 {
 392         de620_ready(dev);
 393         outb(W_DFR, DATA_PORT);
 394         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 395
 396         de620_ready(dev);
 397 #ifdef LOWSPEED
 398         outb(WRITE_DELAY, DATA_PORT);
 399 #else
 400         outb(0, DATA_PORT);
 401 #endif
 402         de620_flip_ds(dev);
 403
 404         de620_ready(dev);
 405 #ifdef LOWSPEED
 406         outb(READ_DELAY, DATA_PORT);
 407 #else
 408         outb(0, DATA_PORT);
 409 #endif
 410         de620_flip_ds(dev);
 411 }
 412
 413 static inline void
 414 de620_set_register(struct net_device *dev, byte reg, byte value)
 415 {
 416         de620_ready(dev);
 417         outb(reg, DATA_PORT);
 418         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 419
 420         de620_put_byte(dev, value);
 421 }
 422
 423 static inline byte
 424 de620_get_register(struct net_device *dev, byte reg)
 425 {
 426         byte value;
 427
 428         de620_send_command(dev,reg);
 429         value = de620_read_byte(dev);
 430         de620_send_command(dev,W_DUMMY);
 431
 432         return value;
 433 }
 434
 435 /*********************************************************************
 436  *
 437  * Open/initialize the board.
 438  *
 439  * This routine should set everything up anew at each open, even
 440  * registers that "should" only need to be set once at boot, so that
 441  * there is a non-reboot way to recover if something goes wrong.
 442  *
 443  */
 444 static int de620_open(struct net_device *dev)
 445 {
 446         int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
 447         if (ret) {
 448                 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
 449                 return ret;
 450         }
 451
 452         if (adapter_init(dev)) {
 453                 ret = -EIO;
 454                 goto out_free_irq;
 455         }
 456
 457         netif_start_queue(dev);
 458         return 0;
 459
 460 out_free_irq:
 461         free_irq(dev->irq, dev);
 462         return ret;
 463 }
 464
 465 /************************************************
 466  *
 467  * The inverse routine to de620_open().
 468  *
 469  */
 470
 471 static int de620_close(struct net_device *dev)
 472 {
 473         netif_stop_queue(dev);
 474         /* disable recv */
 475         de620_set_register(dev, W_TCR, RXOFF);
 476         free_irq(dev->irq, dev);
 477         return 0;
 478 }
 479
 480 /*********************************************
 481  *
 482  * Set or clear the multicast filter for this adaptor.
 483  * (no real multicast implemented for the DE-620, but she can be promiscuous...)
 484  *
 485  */
 486
 487 static void de620_set_multicast_list(struct net_device *dev)
 488 {
 489         if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
 490         { /* Enable promiscuous mode */
 491                 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
 492         }
 493         else
 494         { /* Disable promiscuous mode, use normal mode */
 495                 de620_set_register(dev, W_TCR, TCR_DEF);
 496         }
 497 }
 498
 499 /*******************************************************
 500  *
 501  * Handle timeouts on transmit
 502  */
 503
 504 static void de620_timeout(struct net_device *dev)
 505 {
 506         printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
 507         /* Restart the adapter. */
 508         if (!adapter_init(dev)) /* maybe close it */
 509                 netif_wake_queue(dev);
 510 }
 511
 512 /*******************************************************
 513  *
 514  * Copy a buffer to the adapter transmit page memory.
 515  * Start sending.
 516  */
 517 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
 518 {
 519         unsigned long flags;
 520         int len;
 521         byte *buffer = skb->data;
 522         byte using_txbuf;
 523
 524         using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
 525
 526         netif_stop_queue(dev);
 527
 528
 529         if ((len = skb->len) < RUNT)
 530                 len = RUNT;
 531         if (len & 1) /* send an even number of bytes */
 532                 ++len;
 533
 534         /* Start real output */
 535
 536         spin_lock_irqsave(&de620_lock, flags)
 537         PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
 538                 (int)skb->len, using_txbuf));
 539
 540         /* select a free tx buffer. if there is one... */
 541         switch (using_txbuf) {
 542         default: /* both are free: use TXBF0 */
 543         case TXBF1: /* use TXBF0 */
 544                 de620_send_command(dev,W_CR | RW0);
 545                 using_txbuf |= TXBF0;
 546                 break;
 547
 548         case TXBF0: /* use TXBF1 */
 549                 de620_send_command(dev,W_CR | RW1);
 550                 using_txbuf |= TXBF1;
 551                 break;
 552
 553         case (TXBF0 | TXBF1): /* NONE!!! */
 554                 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
 555                 spin_unlock_irqrestore(&de620_lock, flags);
 556                 return 1;
 557         }
 558         de620_write_block(dev, buffer, skb->len, len-skb->len);
 559
 560         dev->trans_start = jiffies;
 561         if(!(using_txbuf == (TXBF0 | TXBF1)))
 562                 netif_wake_queue(dev);
 563
 564         dev->stats.tx_packets++;
 565         spin_unlock_irqrestore(&de620_lock, flags);
 566         dev_kfree_skb (skb);
 567         return 0;
 568 }
 569
 570 /*****************************************************
 571  *
 572  * Handle the network interface interrupts.
 573  *
 574  */
 575 static irqreturn_t
 576 de620_interrupt(int irq_in, void *dev_id)
 577 {
 578         struct net_device *dev = dev_id;
 579         byte irq_status;
 580         int bogus_count = 0;
 581         int again = 0;
 582
 583         spin_lock(&de620_lock);
 584
 585         /* Read the status register (_not_ the status port) */
 586         irq_status = de620_get_register(dev, R_STS);
 587
 588         PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
 589
 590         if (irq_status & RXGOOD) {
 591                 do {
 592                         again = de620_rx_intr(dev);
 593                         PRINTK(("again=%d\n", again));
 594                 }
 595                 while (again && (++bogus_count < 100));
 596         }
 597
 598         if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
 599                 netif_wake_queue(dev);
 600
 601         spin_unlock(&de620_lock);
 602         return IRQ_HANDLED;
 603 }
 604
 605 /**************************************
 606  *
 607  * Get a packet from the adapter
 608  *
 609  * Send it "upstairs"
 610  *
 611  */
 612 static int de620_rx_intr(struct net_device *dev)
 613 {
 614         struct header_buf {
 615                 byte            status;
 616                 byte            Rx_NextPage;
 617                 unsigned short  Rx_ByteCount;
 618         } header_buf;
 619         struct sk_buff *skb;
 620         int size;
 621         byte *buffer;
 622         byte pagelink;
 623         byte curr_page;
 624
 625         PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
 626
 627         /* Tell the adapter that we are going to read data, and from where */
 628         de620_send_command(dev, W_CR | RRN);
 629         de620_set_register(dev, W_RSA1, next_rx_page);
 630         de620_set_register(dev, W_RSA0, 0);
 631
 632         /* Deep breath, and away we goooooo */
 633         de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
 634         PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
 635         header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
 636
 637         /* Plausible page header? */
 638         pagelink = header_buf.Rx_NextPage;
 639         if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
 640                 /* Ouch... Forget it! Skip all and start afresh... */
 641                 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
 642                 /* You win some, you lose some. And sometimes plenty... */
 643                 adapter_init(dev);
 644                 netif_wake_queue(dev);
 645                 dev->stats.rx_over_errors++;
 646                 return 0;
 647         }
 648
 649         /* OK, this look good, so far. Let's see if it's consistent... */
 650         /* Let's compute the start of the next packet, based on where we are */
 651         pagelink = next_rx_page +
 652                 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
 653
 654         /* Are we going to wrap around the page counter? */
 655         if (pagelink > last_rx_page)
 656                 pagelink -= (last_rx_page - first_rx_page + 1);
 657
 658         /* Is the _computed_ next page number equal to what the adapter says? */
 659         if (pagelink != header_buf.Rx_NextPage) {
 660                 /* Naah, we'll skip this packet. Probably bogus data as well */
 661                 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
 662                 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
 663                 de620_send_command(dev, W_DUMMY);
 664                 de620_set_register(dev, W_NPRF, next_rx_page);
 665                 dev->stats.rx_over_errors++;
 666                 return 0;
 667         }
 668         next_rx_page = pagelink;
 669
 670         size = header_buf.Rx_ByteCount - 4;
 671         if ((size < RUNT) || (GIANT < size)) {
 672                 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
 673         }
 674         else { /* Good packet? */
 675                 skb = dev_alloc_skb(size+2);
 676                 if (skb == NULL) { /* Yeah, but no place to put it... */
 677                         printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 678                         dev->stats.rx_dropped++;
 679                 }
 680                 else { /* Yep! Go get it! */
 681                         skb_reserve(skb,2);     /* Align */
 682                         /* skb->data points to the start of sk_buff data area */
 683                         buffer = skb_put(skb,size);
 684                         /* copy the packet into the buffer */
 685                         de620_read_block(dev, buffer, size);
 686                         PRINTK(("Read %d bytes\n", size));
 687                         skb->protocol=eth_type_trans(skb,dev);
 688                         netif_rx(skb); /* deliver it "upstairs" */
 689                         dev->last_rx = jiffies;
 690                         /* count all receives */
 691                         dev->stats.rx_packets++;
 692                         dev->stats.rx_bytes += size;
 693                 }
 694         }
 695
 696         /* Let's peek ahead to see if we have read the last current packet */
 697         /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
 698         curr_page = de620_get_register(dev, R_CPR);
 699         de620_set_register(dev, W_NPRF, next_rx_page);
 700         PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
 701
 702         return (next_rx_page != curr_page); /* That was slightly tricky... */
 703 }
 704
 705 /*********************************************
 706  *
 707  * Reset the adapter to a known state
 708  *
 709  */
 710 static int adapter_init(struct net_device *dev)
 711 {
 712         int i;
 713         static int was_down;
 714
 715         if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
 716                 EIPRegister = NCTL0;
 717                 if (nic_data.Media != 1)
 718                         EIPRegister |= NIS0;    /* not BNC */
 719         }
 720         else if (nic_data.Model == 2) { /* UTP */
 721                 EIPRegister = NCTL0 | NIS0;
 722         }
 723
 724         if (utp)
 725                 EIPRegister = NCTL0 | NIS0;
 726         if (bnc)
 727                 EIPRegister = NCTL0;
 728
 729         de620_send_command(dev, W_CR | RNOP | CLEAR);
 730         de620_send_command(dev, W_CR | RNOP);
 731
 732         de620_set_register(dev, W_SCR, SCR_DEF);
 733         /* disable recv to wait init */
 734         de620_set_register(dev, W_TCR, RXOFF);
 735
 736         /* Set the node ID in the adapter */
 737         for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
 738                 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
 739         }
 740
 741         de620_set_register(dev, W_EIP, EIPRegister);
 742
 743         next_rx_page = first_rx_page = DE620_RX_START_PAGE;
 744         if (nic_data.RAM_Size)
 745                 last_rx_page = nic_data.RAM_Size - 1;
 746         else /* 64k RAM */
 747                 last_rx_page = 255;
 748
 749         de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
 750         de620_set_register(dev, W_EPR, last_rx_page);  /* End Page Register */
 751         de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
 752         de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
 753         de620_send_command(dev, W_DUMMY);
 754         de620_set_delay(dev);
 755
 756         /* Final sanity check: Anybody out there? */
 757         /* Let's hope some bits from the statusregister make a good check */
 758 #define CHECK_MASK (  0 | TXSUC |  T16  |  0  | RXCRC | RXSHORT |  0  |  0  )
 759 #define CHECK_OK   (  0 |   0   |  0    |  0  |   0   |   0     |  0  |  0  )
 760         /* success:   X     0      0       X      0       0        X     X  */
 761         /* ignore:   EEDI                RXGOOD                   COLS  LNKS*/
 762
 763         if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
 764                 printk(KERN_ERR "%s: Something has happened to the DE-620!  Please check it"
 765 #ifdef SHUTDOWN_WHEN_LOST
 766                         " and do a new ifconfig"
 767 #endif
 768                         "! (%02x)\n", dev->name, i);
 769 #ifdef SHUTDOWN_WHEN_LOST
 770                 /* Goodbye, cruel world... */
 771                 dev->flags &= ~IFF_UP;
 772                 de620_close(dev);
 773 #endif
 774                 was_down = 1;
 775                 return 1; /* failed */
 776         }
 777         if (was_down) {
 778                 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
 779                 was_down = 0;
 780         }
 781
 782         /* All OK, go ahead... */
 783         de620_set_register(dev, W_TCR, TCR_DEF);
 784
 785         return 0; /* all ok */
 786 }
 787
 788 /******************************************************************************
 789  *
 790  * Only start-up code below
 791  *
 792  */
 793 /****************************************
 794  *
 795  * Check if there is a DE-620 connected
 796  */
 797 struct net_device * __init de620_probe(int unit)
 798 {
 799         byte checkbyte = 0xa5;
 800         struct net_device *dev;
 801         int err = -ENOMEM;
 802         int i;
 803         DECLARE_MAC_BUF(mac);
 804
 805         dev = alloc_etherdev(0);
 806         if (!dev)
 807                 goto out;
 808
 809         spin_lock_init(&de620_lock);
 810
 811         /*
 812          * This is where the base_addr and irq gets set.
 813          * Tunable at compile-time and insmod-time
 814          */
 815         dev->base_addr = io;
 816         dev->irq       = irq;
 817
 818         /* allow overriding parameters on command line */
 819         if (unit >= 0) {
 820                 sprintf(dev->name, "eth%d", unit);
 821                 netdev_boot_setup_check(dev);
 822         }
 823
 824         if (de620_debug)
 825                 printk(version);
 826
 827         printk(KERN_INFO "D-Link DE-620 pocket adapter");
 828
 829         if (!request_region(dev->base_addr, 3, "de620")) {
 830                 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
 831                 err = -EBUSY;
 832                 goto out1;
 833         }
 834
 835         /* Initially, configure basic nibble mode, so we can read the EEPROM */
 836         NIC_Cmd = DEF_NIC_CMD;
 837         de620_set_register(dev, W_EIP, EIPRegister);
 838
 839         /* Anybody out there? */
 840         de620_set_register(dev, W_CPR, checkbyte);
 841         checkbyte = de620_get_register(dev, R_CPR);
 842
 843         if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
 844                 printk(" not identified in the printer port\n");
 845                 err = -ENODEV;
 846                 goto out2;
 847         }
 848
 849         /* else, got it! */
 850         dev->dev_addr[0] = nic_data.NodeID[0];
 851         for (i = 1; i < ETH_ALEN; i++) {
 852                 dev->dev_addr[i] = nic_data.NodeID[i];
 853                 dev->broadcast[i] = 0xff;
 854         }
 855
 856         printk(", Ethernet Address: %s", print_mac(mac, dev->dev_addr));
 857
 858         printk(" (%dk RAM,",
 859                 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
 860
 861         if (nic_data.Media == 1)
 862                 printk(" BNC)\n");
 863         else
 864                 printk(" UTP)\n");
 865
 866         dev->open               = de620_open;
 867         dev->stop               = de620_close;
 868         dev->hard_start_xmit    = de620_start_xmit;
 869         dev->tx_timeout         = de620_timeout;
 870         dev->watchdog_timeo     = HZ*2;
 871         dev->set_multicast_list = de620_set_multicast_list;
 872
 873         /* base_addr and irq are already set, see above! */
 874
 875         /* dump eeprom */
 876         if (de620_debug) {
 877                 printk("\nEEPROM contents:\n");
 878                 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
 879                 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
 880                         nic_data.NodeID[0], nic_data.NodeID[1],
 881                         nic_data.NodeID[2], nic_data.NodeID[3],
 882                         nic_data.NodeID[4], nic_data.NodeID[5]);
 883                 printk("Model = %d\n", nic_data.Model);
 884                 printk("Media = %d\n", nic_data.Media);
 885                 printk("SCR = 0x%02x\n", nic_data.SCR);
 886         }
 887
 888         err = register_netdev(dev);
 889         if (err)
 890                 goto out2;
 891         return dev;
 892
 893 out2:
 894         release_region(dev->base_addr, 3);
 895 out1:
 896         free_netdev(dev);
 897 out:
 898         return ERR_PTR(err);
 899 }
 900
 901 /**********************************
 902  *
 903  * Read info from on-board EEPROM
 904  *
 905  * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
 906  */
 907 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
 908
 909 static unsigned short __init ReadAWord(struct net_device *dev, int from)
 910 {
 911         unsigned short data;
 912         int nbits;
 913
 914         /* cs   [__~~] SET SEND STATE */
 915         /* di   [____]                */
 916         /* sck  [_~~_]                */
 917         sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
 918
 919         /* Send the 9-bit address from where we want to read the 16-bit word */
 920         for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
 921                 if (from & 0x0100) { /* bit set? */
 922                         /* cs    [~~~~] SEND 1 */
 923                         /* di    [~~~~]        */
 924                         /* sck   [_~~_]        */
 925                         sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
 926                 }
 927                 else {
 928                         /* cs    [~~~~] SEND 0 */
 929                         /* di    [____]        */
 930                         /* sck   [_~~_]        */
 931                         sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 932                 }
 933         }
 934
 935         /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
 936         for (data = 0, nbits = 16; nbits > 0; --nbits) {
 937                 /* cs    [~~~~] SEND 0 */
 938                 /* di    [____]        */
 939                 /* sck   [_~~_]        */
 940                 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 941                 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
 942         }
 943         /* cs    [____] RESET SEND STATE */
 944         /* di    [____]                  */
 945         /* sck   [_~~_]                  */
 946         sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
 947
 948         return data;
 949 }
 950
 951 static int __init read_eeprom(struct net_device *dev)
 952 {
 953         unsigned short wrd;
 954
 955         /* D-Link Ethernet addresses are in the series  00:80:c8:7X:XX:XX:XX */
 956         wrd = ReadAWord(dev, 0x1aa);    /* bytes 0 + 1 of NodeID */
 957         if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
 958                 return -1; /* Nope, not a DE-620 */
 959         nic_data.NodeID[0] = wrd & 0xff;
 960         nic_data.NodeID[1] = wrd >> 8;
 961
 962         wrd = ReadAWord(dev, 0x1ab);    /* bytes 2 + 3 of NodeID */
 963         if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
 964                 return -1; /* Nope, not a DE-620 */
 965         nic_data.NodeID[2] = wrd & 0xff;
 966         nic_data.NodeID[3] = wrd >> 8;
 967
 968         wrd = ReadAWord(dev, 0x1ac);    /* bytes 4 + 5 of NodeID */
 969         nic_data.NodeID[4] = wrd & 0xff;
 970         nic_data.NodeID[5] = wrd >> 8;
 971
 972         wrd = ReadAWord(dev, 0x1ad);    /* RAM size in pages (256 bytes). 0 = 64k */
 973         nic_data.RAM_Size = (wrd >> 8);
 974
 975         wrd = ReadAWord(dev, 0x1ae);    /* hardware model (CT = 3) */
 976         nic_data.Model = (wrd & 0xff);
 977
 978         wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
 979         nic_data.Media = (wrd & 0xff);
 980
 981         wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
 982         nic_data.SCR = (wrd >> 8);
 983
 984         return 0; /* no errors */
 985 }
 986
 987 /******************************************************************************
 988  *
 989  * Loadable module skeleton
 990  *
 991  */
 992 #ifdef MODULE
 993 static struct net_device *de620_dev;
 994
 995 int __init init_module(void)
 996 {
 997         de620_dev = de620_probe(-1);
 998         if (IS_ERR(de620_dev))
 999                 return PTR_ERR(de620_dev);
1000         return 0;
1001 }
1002
1003 void cleanup_module(void)
1004 {
1005         unregister_netdev(de620_dev);
1006         release_region(de620_dev->base_addr, 3);
1007         free_netdev(de620_dev);
1008 }
1009 #endif /* MODULE */
1010 MODULE_LICENSE("GPL");
1011
1012
1013 /*
1014  * (add '-DMODULE' when compiling as loadable module)
1015  *
1016  * compile-command:
1017  *      gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1018  *       -fomit-frame-pointer -m486 \
1019  *      -I/usr/src/linux/include -I../../net/inet -c de620.c
1020 */
1021 /*
1022  * Local variables:
1023  *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1024  *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1025  *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1026  * End:
1027  */