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                 /*
 492                  *      We must make the kernel realise we had to move
 493                  *      into promisc mode or we start all out war on
 494                  *      the cable. - AC
 495                  */
 496                 dev->flags|=IFF_PROMISC;
 497
 498                 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
 499         }
 500         else
 501         { /* Disable promiscuous mode, use normal mode */
 502                 de620_set_register(dev, W_TCR, TCR_DEF);
 503         }
 504 }
 505
 506 /*******************************************************
 507  *
 508  * Handle timeouts on transmit
 509  */
 510
 511 static void de620_timeout(struct net_device *dev)
 512 {
 513         printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
 514         /* Restart the adapter. */
 515         if (!adapter_init(dev)) /* maybe close it */
 516                 netif_wake_queue(dev);
 517 }
 518
 519 /*******************************************************
 520  *
 521  * Copy a buffer to the adapter transmit page memory.
 522  * Start sending.
 523  */
 524 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
 525 {
 526         unsigned long flags;
 527         int len;
 528         byte *buffer = skb->data;
 529         byte using_txbuf;
 530
 531         using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
 532
 533         netif_stop_queue(dev);
 534
 535
 536         if ((len = skb->len) < RUNT)
 537                 len = RUNT;
 538         if (len & 1) /* send an even number of bytes */
 539                 ++len;
 540
 541         /* Start real output */
 542
 543         spin_lock_irqsave(&de620_lock, flags)
 544         PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
 545                 (int)skb->len, using_txbuf));
 546
 547         /* select a free tx buffer. if there is one... */
 548         switch (using_txbuf) {
 549         default: /* both are free: use TXBF0 */
 550         case TXBF1: /* use TXBF0 */
 551                 de620_send_command(dev,W_CR | RW0);
 552                 using_txbuf |= TXBF0;
 553                 break;
 554
 555         case TXBF0: /* use TXBF1 */
 556                 de620_send_command(dev,W_CR | RW1);
 557                 using_txbuf |= TXBF1;
 558                 break;
 559
 560         case (TXBF0 | TXBF1): /* NONE!!! */
 561                 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
 562                 spin_unlock_irqrestore(&de620_lock, flags);
 563                 return 1;
 564         }
 565         de620_write_block(dev, buffer, skb->len, len-skb->len);
 566
 567         dev->trans_start = jiffies;
 568         if(!(using_txbuf == (TXBF0 | TXBF1)))
 569                 netif_wake_queue(dev);
 570
 571         dev->stats.tx_packets++;
 572         spin_unlock_irqrestore(&de620_lock, flags);
 573         dev_kfree_skb (skb);
 574         return 0;
 575 }
 576
 577 /*****************************************************
 578  *
 579  * Handle the network interface interrupts.
 580  *
 581  */
 582 static irqreturn_t
 583 de620_interrupt(int irq_in, void *dev_id)
 584 {
 585         struct net_device *dev = dev_id;
 586         byte irq_status;
 587         int bogus_count = 0;
 588         int again = 0;
 589
 590         spin_lock(&de620_lock);
 591
 592         /* Read the status register (_not_ the status port) */
 593         irq_status = de620_get_register(dev, R_STS);
 594
 595         PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
 596
 597         if (irq_status & RXGOOD) {
 598                 do {
 599                         again = de620_rx_intr(dev);
 600                         PRINTK(("again=%d\n", again));
 601                 }
 602                 while (again && (++bogus_count < 100));
 603         }
 604
 605         if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
 606                 netif_wake_queue(dev);
 607
 608         spin_unlock(&de620_lock);
 609         return IRQ_HANDLED;
 610 }
 611
 612 /**************************************
 613  *
 614  * Get a packet from the adapter
 615  *
 616  * Send it "upstairs"
 617  *
 618  */
 619 static int de620_rx_intr(struct net_device *dev)
 620 {
 621         struct header_buf {
 622                 byte            status;
 623                 byte            Rx_NextPage;
 624                 unsigned short  Rx_ByteCount;
 625         } header_buf;
 626         struct sk_buff *skb;
 627         int size;
 628         byte *buffer;
 629         byte pagelink;
 630         byte curr_page;
 631
 632         PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
 633
 634         /* Tell the adapter that we are going to read data, and from where */
 635         de620_send_command(dev, W_CR | RRN);
 636         de620_set_register(dev, W_RSA1, next_rx_page);
 637         de620_set_register(dev, W_RSA0, 0);
 638
 639         /* Deep breath, and away we goooooo */
 640         de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
 641         PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
 642         header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
 643
 644         /* Plausible page header? */
 645         pagelink = header_buf.Rx_NextPage;
 646         if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
 647                 /* Ouch... Forget it! Skip all and start afresh... */
 648                 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
 649                 /* You win some, you lose some. And sometimes plenty... */
 650                 adapter_init(dev);
 651                 netif_wake_queue(dev);
 652                 dev->stats.rx_over_errors++;
 653                 return 0;
 654         }
 655
 656         /* OK, this look good, so far. Let's see if it's consistent... */
 657         /* Let's compute the start of the next packet, based on where we are */
 658         pagelink = next_rx_page +
 659                 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
 660
 661         /* Are we going to wrap around the page counter? */
 662         if (pagelink > last_rx_page)
 663                 pagelink -= (last_rx_page - first_rx_page + 1);
 664
 665         /* Is the _computed_ next page number equal to what the adapter says? */
 666         if (pagelink != header_buf.Rx_NextPage) {
 667                 /* Naah, we'll skip this packet. Probably bogus data as well */
 668                 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
 669                 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
 670                 de620_send_command(dev, W_DUMMY);
 671                 de620_set_register(dev, W_NPRF, next_rx_page);
 672                 dev->stats.rx_over_errors++;
 673                 return 0;
 674         }
 675         next_rx_page = pagelink;
 676
 677         size = header_buf.Rx_ByteCount - 4;
 678         if ((size < RUNT) || (GIANT < size)) {
 679                 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
 680         }
 681         else { /* Good packet? */
 682                 skb = dev_alloc_skb(size+2);
 683                 if (skb == NULL) { /* Yeah, but no place to put it... */
 684                         printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 685                         dev->stats.rx_dropped++;
 686                 }
 687                 else { /* Yep! Go get it! */
 688                         skb_reserve(skb,2);     /* Align */
 689                         /* skb->data points to the start of sk_buff data area */
 690                         buffer = skb_put(skb,size);
 691                         /* copy the packet into the buffer */
 692                         de620_read_block(dev, buffer, size);
 693                         PRINTK(("Read %d bytes\n", size));
 694                         skb->protocol=eth_type_trans(skb,dev);
 695                         netif_rx(skb); /* deliver it "upstairs" */
 696                         dev->last_rx = jiffies;
 697                         /* count all receives */
 698                         dev->stats.rx_packets++;
 699                         dev->stats.rx_bytes += size;
 700                 }
 701         }
 702
 703         /* Let's peek ahead to see if we have read the last current packet */
 704         /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
 705         curr_page = de620_get_register(dev, R_CPR);
 706         de620_set_register(dev, W_NPRF, next_rx_page);
 707         PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
 708
 709         return (next_rx_page != curr_page); /* That was slightly tricky... */
 710 }
 711
 712 /*********************************************
 713  *
 714  * Reset the adapter to a known state
 715  *
 716  */
 717 static int adapter_init(struct net_device *dev)
 718 {
 719         int i;
 720         static int was_down;
 721
 722         if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
 723                 EIPRegister = NCTL0;
 724                 if (nic_data.Media != 1)
 725                         EIPRegister |= NIS0;    /* not BNC */
 726         }
 727         else if (nic_data.Model == 2) { /* UTP */
 728                 EIPRegister = NCTL0 | NIS0;
 729         }
 730
 731         if (utp)
 732                 EIPRegister = NCTL0 | NIS0;
 733         if (bnc)
 734                 EIPRegister = NCTL0;
 735
 736         de620_send_command(dev, W_CR | RNOP | CLEAR);
 737         de620_send_command(dev, W_CR | RNOP);
 738
 739         de620_set_register(dev, W_SCR, SCR_DEF);
 740         /* disable recv to wait init */
 741         de620_set_register(dev, W_TCR, RXOFF);
 742
 743         /* Set the node ID in the adapter */
 744         for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
 745                 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
 746         }
 747
 748         de620_set_register(dev, W_EIP, EIPRegister);
 749
 750         next_rx_page = first_rx_page = DE620_RX_START_PAGE;
 751         if (nic_data.RAM_Size)
 752                 last_rx_page = nic_data.RAM_Size - 1;
 753         else /* 64k RAM */
 754                 last_rx_page = 255;
 755
 756         de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
 757         de620_set_register(dev, W_EPR, last_rx_page);  /* End Page Register */
 758         de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
 759         de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
 760         de620_send_command(dev, W_DUMMY);
 761         de620_set_delay(dev);
 762
 763         /* Final sanity check: Anybody out there? */
 764         /* Let's hope some bits from the statusregister make a good check */
 765 #define CHECK_MASK (  0 | TXSUC |  T16  |  0  | RXCRC | RXSHORT |  0  |  0  )
 766 #define CHECK_OK   (  0 |   0   |  0    |  0  |   0   |   0     |  0  |  0  )
 767         /* success:   X     0      0       X      0       0        X     X  */
 768         /* ignore:   EEDI                RXGOOD                   COLS  LNKS*/
 769
 770         if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
 771                 printk(KERN_ERR "%s: Something has happened to the DE-620!  Please check it"
 772 #ifdef SHUTDOWN_WHEN_LOST
 773                         " and do a new ifconfig"
 774 #endif
 775                         "! (%02x)\n", dev->name, i);
 776 #ifdef SHUTDOWN_WHEN_LOST
 777                 /* Goodbye, cruel world... */
 778                 dev->flags &= ~IFF_UP;
 779                 de620_close(dev);
 780 #endif
 781                 was_down = 1;
 782                 return 1; /* failed */
 783         }
 784         if (was_down) {
 785                 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
 786                 was_down = 0;
 787         }
 788
 789         /* All OK, go ahead... */
 790         de620_set_register(dev, W_TCR, TCR_DEF);
 791
 792         return 0; /* all ok */
 793 }
 794
 795 /******************************************************************************
 796  *
 797  * Only start-up code below
 798  *
 799  */
 800 /****************************************
 801  *
 802  * Check if there is a DE-620 connected
 803  */
 804 struct net_device * __init de620_probe(int unit)
 805 {
 806         byte checkbyte = 0xa5;
 807         struct net_device *dev;
 808         int err = -ENOMEM;
 809         int i;
 810         DECLARE_MAC_BUF(mac);
 811
 812         dev = alloc_etherdev(0);
 813         if (!dev)
 814                 goto out;
 815
 816         spin_lock_init(&de620_lock);
 817
 818         /*
 819          * This is where the base_addr and irq gets set.
 820          * Tunable at compile-time and insmod-time
 821          */
 822         dev->base_addr = io;
 823         dev->irq       = irq;
 824
 825         /* allow overriding parameters on command line */
 826         if (unit >= 0) {
 827                 sprintf(dev->name, "eth%d", unit);
 828                 netdev_boot_setup_check(dev);
 829         }
 830
 831         if (de620_debug)
 832                 printk(version);
 833
 834         printk(KERN_INFO "D-Link DE-620 pocket adapter");
 835
 836         if (!request_region(dev->base_addr, 3, "de620")) {
 837                 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
 838                 err = -EBUSY;
 839                 goto out1;
 840         }
 841
 842         /* Initially, configure basic nibble mode, so we can read the EEPROM */
 843         NIC_Cmd = DEF_NIC_CMD;
 844         de620_set_register(dev, W_EIP, EIPRegister);
 845
 846         /* Anybody out there? */
 847         de620_set_register(dev, W_CPR, checkbyte);
 848         checkbyte = de620_get_register(dev, R_CPR);
 849
 850         if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
 851                 printk(" not identified in the printer port\n");
 852                 err = -ENODEV;
 853                 goto out2;
 854         }
 855
 856         /* else, got it! */
 857         dev->dev_addr[0] = nic_data.NodeID[0];
 858         for (i = 1; i < ETH_ALEN; i++) {
 859                 dev->dev_addr[i] = nic_data.NodeID[i];
 860                 dev->broadcast[i] = 0xff;
 861         }
 862
 863         printk(", Ethernet Address: %s", print_mac(mac, dev->dev_addr));
 864
 865         printk(" (%dk RAM,",
 866                 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
 867
 868         if (nic_data.Media == 1)
 869                 printk(" BNC)\n");
 870         else
 871                 printk(" UTP)\n");
 872
 873         dev->open               = de620_open;
 874         dev->stop               = de620_close;
 875         dev->hard_start_xmit    = de620_start_xmit;
 876         dev->tx_timeout         = de620_timeout;
 877         dev->watchdog_timeo     = HZ*2;
 878         dev->set_multicast_list = de620_set_multicast_list;
 879
 880         /* base_addr and irq are already set, see above! */
 881
 882         /* dump eeprom */
 883         if (de620_debug) {
 884                 printk("\nEEPROM contents:\n");
 885                 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
 886                 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
 887                         nic_data.NodeID[0], nic_data.NodeID[1],
 888                         nic_data.NodeID[2], nic_data.NodeID[3],
 889                         nic_data.NodeID[4], nic_data.NodeID[5]);
 890                 printk("Model = %d\n", nic_data.Model);
 891                 printk("Media = %d\n", nic_data.Media);
 892                 printk("SCR = 0x%02x\n", nic_data.SCR);
 893         }
 894
 895         err = register_netdev(dev);
 896         if (err)
 897                 goto out2;
 898         return dev;
 899
 900 out2:
 901         release_region(dev->base_addr, 3);
 902 out1:
 903         free_netdev(dev);
 904 out:
 905         return ERR_PTR(err);
 906 }
 907
 908 /**********************************
 909  *
 910  * Read info from on-board EEPROM
 911  *
 912  * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
 913  */
 914 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
 915
 916 static unsigned short __init ReadAWord(struct net_device *dev, int from)
 917 {
 918         unsigned short data;
 919         int nbits;
 920
 921         /* cs   [__~~] SET SEND STATE */
 922         /* di   [____]                */
 923         /* sck  [_~~_]                */
 924         sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
 925
 926         /* Send the 9-bit address from where we want to read the 16-bit word */
 927         for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
 928                 if (from & 0x0100) { /* bit set? */
 929                         /* cs    [~~~~] SEND 1 */
 930                         /* di    [~~~~]        */
 931                         /* sck   [_~~_]        */
 932                         sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
 933                 }
 934                 else {
 935                         /* cs    [~~~~] SEND 0 */
 936                         /* di    [____]        */
 937                         /* sck   [_~~_]        */
 938                         sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 939                 }
 940         }
 941
 942         /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
 943         for (data = 0, nbits = 16; nbits > 0; --nbits) {
 944                 /* cs    [~~~~] SEND 0 */
 945                 /* di    [____]        */
 946                 /* sck   [_~~_]        */
 947                 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 948                 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
 949         }
 950         /* cs    [____] RESET SEND STATE */
 951         /* di    [____]                  */
 952         /* sck   [_~~_]                  */
 953         sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
 954
 955         return data;
 956 }
 957
 958 static int __init read_eeprom(struct net_device *dev)
 959 {
 960         unsigned short wrd;
 961
 962         /* D-Link Ethernet addresses are in the series  00:80:c8:7X:XX:XX:XX */
 963         wrd = ReadAWord(dev, 0x1aa);    /* bytes 0 + 1 of NodeID */
 964         if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
 965                 return -1; /* Nope, not a DE-620 */
 966         nic_data.NodeID[0] = wrd & 0xff;
 967         nic_data.NodeID[1] = wrd >> 8;
 968
 969         wrd = ReadAWord(dev, 0x1ab);    /* bytes 2 + 3 of NodeID */
 970         if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
 971                 return -1; /* Nope, not a DE-620 */
 972         nic_data.NodeID[2] = wrd & 0xff;
 973         nic_data.NodeID[3] = wrd >> 8;
 974
 975         wrd = ReadAWord(dev, 0x1ac);    /* bytes 4 + 5 of NodeID */
 976         nic_data.NodeID[4] = wrd & 0xff;
 977         nic_data.NodeID[5] = wrd >> 8;
 978
 979         wrd = ReadAWord(dev, 0x1ad);    /* RAM size in pages (256 bytes). 0 = 64k */
 980         nic_data.RAM_Size = (wrd >> 8);
 981
 982         wrd = ReadAWord(dev, 0x1ae);    /* hardware model (CT = 3) */
 983         nic_data.Model = (wrd & 0xff);
 984
 985         wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
 986         nic_data.Media = (wrd & 0xff);
 987
 988         wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
 989         nic_data.SCR = (wrd >> 8);
 990
 991         return 0; /* no errors */
 992 }
 993
 994 /******************************************************************************
 995  *
 996  * Loadable module skeleton
 997  *
 998  */
 999 #ifdef MODULE
1000 static struct net_device *de620_dev;
1001
1002 int __init init_module(void)
1003 {
1004         de620_dev = de620_probe(-1);
1005         if (IS_ERR(de620_dev))
1006                 return PTR_ERR(de620_dev);
1007         return 0;
1008 }
1009
1010 void cleanup_module(void)
1011 {
1012         unregister_netdev(de620_dev);
1013         release_region(de620_dev->base_addr, 3);
1014         free_netdev(de620_dev);
1015 }
1016 #endif /* MODULE */
1017 MODULE_LICENSE("GPL");
1018
1019
1020 /*
1021  * (add '-DMODULE' when compiling as loadable module)
1022  *
1023  * compile-command:
1024  *      gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1025  *       -fomit-frame-pointer -m486 \
1026  *      -I/usr/src/linux/include -I../../net/inet -c de620.c
1027 */
1028 /*
1029  * Local variables:
1030  *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1031  *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1032  *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1033  * End:
1034  */