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  * -DSHUTDOWN_WHEN_LOST
  52  * -DCOUNT_LOOPS
  53  * -DLOWSPEED
  54  * -DREAD_DELAY
  55  * -DWRITE_DELAY
  56  */
  57
  58 /*
  59  * This driver assumes that the printer port is a "normal",
  60  * dumb, uni-directional port!
  61  * If your port is "fancy" in any way, please try to set it to "normal"
  62  * with your BIOS setup.  I have no access to machines with bi-directional
  63  * ports, so I can't test such a driver :-(
  64  * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
  65  *
  66  * There are some clones of DE620 out there, with different names.
  67  * If the current driver does not recognize a clone, try to change
  68  * the following #define to:
  69  *
  70  * #define DE620_CLONE 1
  71  */
  72 #define DE620_CLONE 0
  73
  74 /*
  75  * If the adapter has problems with high speeds, enable this #define
  76  * otherwise full printerport speed will be attempted.
  77  *
  78  * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
  79  *
  80 #define LOWSPEED
  81  */
  82
  83 #ifndef READ_DELAY
  84 #define READ_DELAY 100  /* adapter internal read delay in 100ns units */
  85 #endif
  86
  87 #ifndef WRITE_DELAY
  88 #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */
  89 #endif
  90
  91 /*
  92  * Enable this #define if you want the adapter to do a "ifconfig down" on
  93  * itself when we have detected that something is possibly wrong with it.
  94  * The default behaviour is to retry with "adapter_init()" until success.
  95  * This should be used for debugging purposes only.
  96  *
  97 #define SHUTDOWN_WHEN_LOST
  98  */
  99
 100 #ifdef LOWSPEED
 101 /*
 102  * Enable this #define if you want to see debugging output that show how long
 103  * we have to wait before the DE-620 is ready for the next read/write/command.
 104  *
 105 #define COUNT_LOOPS
 106  */
 107 #endif
 108
 109 #include <linux/module.h>
 110 #include <linux/kernel.h>
 111 #include <linux/types.h>
 112 #include <linux/fcntl.h>
 113 #include <linux/string.h>
 114 #include <linux/interrupt.h>
 115 #include <linux/ioport.h>
 116 #include <linux/in.h>
 117 #include <linux/errno.h>
 118 #include <linux/init.h>
 119 #include <linux/inet.h>
 120 #include <linux/netdevice.h>
 121 #include <linux/etherdevice.h>
 122 #include <linux/skbuff.h>
 123
 124 #include <asm/io.h>
 125 #include <asm/system.h>
 126
 127 /* Constant definitions for the DE-620 registers, commands and bits */
 128 #include "de620.h"
 129
 130 typedef unsigned char byte;
 131
 132 /*******************************************************
 133  *                                                     *
 134  * Definition of D-Link DE-620 Ethernet Pocket adapter *
 135  * See also "de620.h"                                  *
 136  *                                                     *
 137  *******************************************************/
 138 #ifndef DE620_IO /* Compile-time configurable */
 139 #define DE620_IO 0x378
 140 #endif
 141
 142 #ifndef DE620_IRQ /* Compile-time configurable */
 143 #define DE620_IRQ       7
 144 #endif
 145
 146 #define DATA_PORT       (dev->base_addr)
 147 #define STATUS_PORT     (dev->base_addr + 1)
 148 #define COMMAND_PORT    (dev->base_addr + 2)
 149
 150 #define RUNT 60         /* Too small Ethernet packet */
 151 #define GIANT 1514      /* largest legal size packet, no fcs */
 152
 153 /*
 154  * Force media with insmod:
 155  *      insmod de620.o bnc=1
 156  * or
 157  *      insmod de620.o utp=1
 158  *
 159  * Force io and/or irq with insmod:
 160  *      insmod de620.o io=0x378 irq=7
 161  *
 162  * Make a clone skip the Ethernet-address range check:
 163  *      insmod de620.o clone=1
 164  */
 165 static int bnc;
 166 static int utp;
 167 static int io  = DE620_IO;
 168 static int irq = DE620_IRQ;
 169 static int clone = DE620_CLONE;
 170
 171 static spinlock_t de620_lock;
 172
 173 module_param(bnc, int, 0);
 174 module_param(utp, int, 0);
 175 module_param(io, int, 0);
 176 module_param(irq, int, 0);
 177 module_param(clone, int, 0);
 178 MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
 179 MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
 180 MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
 181 MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
 182 MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
 183
 184 /***********************************************
 185  *                                             *
 186  * Index to functions, as function prototypes. *
 187  *                                             *
 188  ***********************************************/
 189
 190 /*
 191  * Routines used internally. (See also "convenience macros.. below")
 192  */
 193
 194 /* Put in the device structure. */
 195 static int      de620_open(struct net_device *);
 196 static int      de620_close(struct net_device *);
 197 static void     de620_set_multicast_list(struct net_device *);
 198 static int      de620_start_xmit(struct sk_buff *, struct net_device *);
 199
 200 /* Dispatch from interrupts. */
 201 static irqreturn_t de620_interrupt(int, void *);
 202 static int      de620_rx_intr(struct net_device *);
 203
 204 /* Initialization */
 205 static int      adapter_init(struct net_device *);
 206 static int      read_eeprom(struct net_device *);
 207
 208
 209 /*
 210  * D-Link driver variables:
 211  */
 212 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
 213 #define TCR_DEF RXPB                    /* not used: | TXSUCINT | T16INT */
 214 #define DE620_RX_START_PAGE 12          /* 12 pages (=3k) reserved for tx */
 215 #define DEF_NIC_CMD IRQEN | ICEN | DS1
 216
 217 static volatile byte    NIC_Cmd;
 218 static volatile byte    next_rx_page;
 219 static byte             first_rx_page;
 220 static byte             last_rx_page;
 221 static byte             EIPRegister;
 222
 223 static struct nic {
 224         byte    NodeID[6];
 225         byte    RAM_Size;
 226         byte    Model;
 227         byte    Media;
 228         byte    SCR;
 229 } nic_data;
 230
 231 /**********************************************************
 232  *                                                        *
 233  * Convenience macros/functions for D-Link DE-620 adapter *
 234  *                                                        *
 235  **********************************************************/
 236 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
 237 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
 238
 239 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
 240 #ifdef COUNT_LOOPS
 241 static int tot_cnt;
 242 #endif
 243 static inline byte
 244 de620_ready(struct net_device *dev)
 245 {
 246         byte value;
 247         register short int cnt = 0;
 248
 249         while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
 250                 ++cnt;
 251
 252 #ifdef COUNT_LOOPS
 253         tot_cnt += cnt;
 254 #endif
 255         return value & 0xf0; /* nibble */
 256 }
 257
 258 static inline void
 259 de620_send_command(struct net_device *dev, byte cmd)
 260 {
 261         de620_ready(dev);
 262         if (cmd == W_DUMMY)
 263                 outb(NIC_Cmd, COMMAND_PORT);
 264
 265         outb(cmd, DATA_PORT);
 266
 267         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 268         de620_ready(dev);
 269         outb(NIC_Cmd, COMMAND_PORT);
 270 }
 271
 272 static inline void
 273 de620_put_byte(struct net_device *dev, byte value)
 274 {
 275         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 276         de620_ready(dev);
 277         outb(value, DATA_PORT);
 278         de620_flip_ds(dev);
 279 }
 280
 281 static inline byte
 282 de620_read_byte(struct net_device *dev)
 283 {
 284         byte value;
 285
 286         /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
 287         value = de620_ready(dev); /* High nibble */
 288         de620_flip_ds(dev);
 289         value |= de620_ready(dev) >> 4; /* Low nibble */
 290         return value;
 291 }
 292
 293 static inline void
 294 de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
 295 {
 296 #ifndef LOWSPEED
 297         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 298         byte dflip = NIC_Cmd;
 299 #else /* LOWSPEED */
 300 #ifdef COUNT_LOOPS
 301         int bytes = count;
 302 #endif /* COUNT_LOOPS */
 303 #endif /* LOWSPEED */
 304
 305 #ifdef LOWSPEED
 306 #ifdef COUNT_LOOPS
 307         tot_cnt = 0;
 308 #endif /* COUNT_LOOPS */
 309         /* No further optimization useful, the limit is in the adapter. */
 310         for ( ; count > 0; --count, ++buffer) {
 311                 de620_put_byte(dev,*buffer);
 312         }
 313         for ( count = pad ; count > 0; --count, ++buffer) {
 314                 de620_put_byte(dev, 0);
 315         }
 316         de620_send_command(dev,W_DUMMY);
 317 #ifdef COUNT_LOOPS
 318         /* trial debug output: loops per byte in de620_ready() */
 319         printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
 320 #endif /* COUNT_LOOPS */
 321 #else /* not LOWSPEED */
 322         for ( ; count > 0; count -=2) {
 323                 outb(*buffer++, DATA_PORT);
 324                 outb(uflip, COMMAND_PORT);
 325                 outb(*buffer++, DATA_PORT);
 326                 outb(dflip, COMMAND_PORT);
 327         }
 328         de620_send_command(dev,W_DUMMY);
 329 #endif /* LOWSPEED */
 330 }
 331
 332 static inline void
 333 de620_read_block(struct net_device *dev, byte *data, int count)
 334 {
 335 #ifndef LOWSPEED
 336         byte value;
 337         byte uflip = NIC_Cmd ^ (DS0 | DS1);
 338         byte dflip = NIC_Cmd;
 339 #else /* LOWSPEED */
 340 #ifdef COUNT_LOOPS
 341         int bytes = count;
 342
 343         tot_cnt = 0;
 344 #endif /* COUNT_LOOPS */
 345 #endif /* LOWSPEED */
 346
 347 #ifdef LOWSPEED
 348         /* No further optimization useful, the limit is in the adapter. */
 349         while (count-- > 0) {
 350                 *data++ = de620_read_byte(dev);
 351                 de620_flip_ds(dev);
 352         }
 353 #ifdef COUNT_LOOPS
 354         /* trial debug output: loops per byte in de620_ready() */
 355         printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
 356 #endif /* COUNT_LOOPS */
 357 #else /* not LOWSPEED */
 358         while (count-- > 0) {
 359                 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
 360                 outb(uflip, COMMAND_PORT);
 361                 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
 362                 outb(dflip , COMMAND_PORT);
 363         }
 364 #endif /* LOWSPEED */
 365 }
 366
 367 static inline void
 368 de620_set_delay(struct net_device *dev)
 369 {
 370         de620_ready(dev);
 371         outb(W_DFR, DATA_PORT);
 372         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 373
 374         de620_ready(dev);
 375 #ifdef LOWSPEED
 376         outb(WRITE_DELAY, DATA_PORT);
 377 #else
 378         outb(0, DATA_PORT);
 379 #endif
 380         de620_flip_ds(dev);
 381
 382         de620_ready(dev);
 383 #ifdef LOWSPEED
 384         outb(READ_DELAY, DATA_PORT);
 385 #else
 386         outb(0, DATA_PORT);
 387 #endif
 388         de620_flip_ds(dev);
 389 }
 390
 391 static inline void
 392 de620_set_register(struct net_device *dev, byte reg, byte value)
 393 {
 394         de620_ready(dev);
 395         outb(reg, DATA_PORT);
 396         outb(NIC_Cmd ^ CS0, COMMAND_PORT);
 397
 398         de620_put_byte(dev, value);
 399 }
 400
 401 static inline byte
 402 de620_get_register(struct net_device *dev, byte reg)
 403 {
 404         byte value;
 405
 406         de620_send_command(dev,reg);
 407         value = de620_read_byte(dev);
 408         de620_send_command(dev,W_DUMMY);
 409
 410         return value;
 411 }
 412
 413 /*********************************************************************
 414  *
 415  * Open/initialize the board.
 416  *
 417  * This routine should set everything up anew at each open, even
 418  * registers that "should" only need to be set once at boot, so that
 419  * there is a non-reboot way to recover if something goes wrong.
 420  *
 421  */
 422 static int de620_open(struct net_device *dev)
 423 {
 424         int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
 425         if (ret) {
 426                 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
 427                 return ret;
 428         }
 429
 430         if (adapter_init(dev)) {
 431                 ret = -EIO;
 432                 goto out_free_irq;
 433         }
 434
 435         netif_start_queue(dev);
 436         return 0;
 437
 438 out_free_irq:
 439         free_irq(dev->irq, dev);
 440         return ret;
 441 }
 442
 443 /************************************************
 444  *
 445  * The inverse routine to de620_open().
 446  *
 447  */
 448
 449 static int de620_close(struct net_device *dev)
 450 {
 451         netif_stop_queue(dev);
 452         /* disable recv */
 453         de620_set_register(dev, W_TCR, RXOFF);
 454         free_irq(dev->irq, dev);
 455         return 0;
 456 }
 457
 458 /*********************************************
 459  *
 460  * Set or clear the multicast filter for this adaptor.
 461  * (no real multicast implemented for the DE-620, but she can be promiscuous...)
 462  *
 463  */
 464
 465 static void de620_set_multicast_list(struct net_device *dev)
 466 {
 467         if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
 468         { /* Enable promiscuous mode */
 469                 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
 470         }
 471         else
 472         { /* Disable promiscuous mode, use normal mode */
 473                 de620_set_register(dev, W_TCR, TCR_DEF);
 474         }
 475 }
 476
 477 /*******************************************************
 478  *
 479  * Handle timeouts on transmit
 480  */
 481
 482 static void de620_timeout(struct net_device *dev)
 483 {
 484         printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
 485         /* Restart the adapter. */
 486         if (!adapter_init(dev)) /* maybe close it */
 487                 netif_wake_queue(dev);
 488 }
 489
 490 /*******************************************************
 491  *
 492  * Copy a buffer to the adapter transmit page memory.
 493  * Start sending.
 494  */
 495 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
 496 {
 497         unsigned long flags;
 498         int len;
 499         byte *buffer = skb->data;
 500         byte using_txbuf;
 501
 502         using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
 503
 504         netif_stop_queue(dev);
 505
 506
 507         if ((len = skb->len) < RUNT)
 508                 len = RUNT;
 509         if (len & 1) /* send an even number of bytes */
 510                 ++len;
 511
 512         /* Start real output */
 513
 514         spin_lock_irqsave(&de620_lock, flags);
 515         pr_debug("de620_start_xmit: len=%d, bufs 0x%02x\n",
 516                 (int)skb->len, using_txbuf);
 517
 518         /* select a free tx buffer. if there is one... */
 519         switch (using_txbuf) {
 520         default: /* both are free: use TXBF0 */
 521         case TXBF1: /* use TXBF0 */
 522                 de620_send_command(dev,W_CR | RW0);
 523                 using_txbuf |= TXBF0;
 524                 break;
 525
 526         case TXBF0: /* use TXBF1 */
 527                 de620_send_command(dev,W_CR | RW1);
 528                 using_txbuf |= TXBF1;
 529                 break;
 530
 531         case (TXBF0 | TXBF1): /* NONE!!! */
 532                 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
 533                 spin_unlock_irqrestore(&de620_lock, flags);
 534                 return NETDEV_TX_BUSY;
 535         }
 536         de620_write_block(dev, buffer, skb->len, len-skb->len);
 537
 538         dev->trans_start = jiffies;
 539         if(!(using_txbuf == (TXBF0 | TXBF1)))
 540                 netif_wake_queue(dev);
 541
 542         dev->stats.tx_packets++;
 543         spin_unlock_irqrestore(&de620_lock, flags);
 544         dev_kfree_skb (skb);
 545         return NETDEV_TX_OK;
 546 }
 547
 548 /*****************************************************
 549  *
 550  * Handle the network interface interrupts.
 551  *
 552  */
 553 static irqreturn_t
 554 de620_interrupt(int irq_in, void *dev_id)
 555 {
 556         struct net_device *dev = dev_id;
 557         byte irq_status;
 558         int bogus_count = 0;
 559         int again = 0;
 560
 561         spin_lock(&de620_lock);
 562
 563         /* Read the status register (_not_ the status port) */
 564         irq_status = de620_get_register(dev, R_STS);
 565
 566         pr_debug("de620_interrupt (%2.2X)\n", irq_status);
 567
 568         if (irq_status & RXGOOD) {
 569                 do {
 570                         again = de620_rx_intr(dev);
 571                         pr_debug("again=%d\n", again);
 572                 }
 573                 while (again && (++bogus_count < 100));
 574         }
 575
 576         if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
 577                 netif_wake_queue(dev);
 578
 579         spin_unlock(&de620_lock);
 580         return IRQ_HANDLED;
 581 }
 582
 583 /**************************************
 584  *
 585  * Get a packet from the adapter
 586  *
 587  * Send it "upstairs"
 588  *
 589  */
 590 static int de620_rx_intr(struct net_device *dev)
 591 {
 592         struct header_buf {
 593                 byte            status;
 594                 byte            Rx_NextPage;
 595                 unsigned short  Rx_ByteCount;
 596         } header_buf;
 597         struct sk_buff *skb;
 598         int size;
 599         byte *buffer;
 600         byte pagelink;
 601         byte curr_page;
 602
 603         pr_debug("de620_rx_intr: next_rx_page = %d\n", next_rx_page);
 604
 605         /* Tell the adapter that we are going to read data, and from where */
 606         de620_send_command(dev, W_CR | RRN);
 607         de620_set_register(dev, W_RSA1, next_rx_page);
 608         de620_set_register(dev, W_RSA0, 0);
 609
 610         /* Deep breath, and away we goooooo */
 611         de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
 612         pr_debug("page status=0x%02x, nextpage=%d, packetsize=%d\n",
 613                 header_buf.status, header_buf.Rx_NextPage,
 614                 header_buf.Rx_ByteCount);
 615
 616         /* Plausible page header? */
 617         pagelink = header_buf.Rx_NextPage;
 618         if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
 619                 /* Ouch... Forget it! Skip all and start afresh... */
 620                 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
 621                 /* You win some, you lose some. And sometimes plenty... */
 622                 adapter_init(dev);
 623                 netif_wake_queue(dev);
 624                 dev->stats.rx_over_errors++;
 625                 return 0;
 626         }
 627
 628         /* OK, this look good, so far. Let's see if it's consistent... */
 629         /* Let's compute the start of the next packet, based on where we are */
 630         pagelink = next_rx_page +
 631                 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
 632
 633         /* Are we going to wrap around the page counter? */
 634         if (pagelink > last_rx_page)
 635                 pagelink -= (last_rx_page - first_rx_page + 1);
 636
 637         /* Is the _computed_ next page number equal to what the adapter says? */
 638         if (pagelink != header_buf.Rx_NextPage) {
 639                 /* Naah, we'll skip this packet. Probably bogus data as well */
 640                 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
 641                 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
 642                 de620_send_command(dev, W_DUMMY);
 643                 de620_set_register(dev, W_NPRF, next_rx_page);
 644                 dev->stats.rx_over_errors++;
 645                 return 0;
 646         }
 647         next_rx_page = pagelink;
 648
 649         size = header_buf.Rx_ByteCount - 4;
 650         if ((size < RUNT) || (GIANT < size)) {
 651                 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
 652         }
 653         else { /* Good packet? */
 654                 skb = dev_alloc_skb(size+2);
 655                 if (skb == NULL) { /* Yeah, but no place to put it... */
 656                         printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 657                         dev->stats.rx_dropped++;
 658                 }
 659                 else { /* Yep! Go get it! */
 660                         skb_reserve(skb,2);     /* Align */
 661                         /* skb->data points to the start of sk_buff data area */
 662                         buffer = skb_put(skb,size);
 663                         /* copy the packet into the buffer */
 664                         de620_read_block(dev, buffer, size);
 665                         pr_debug("Read %d bytes\n", size);
 666                         skb->protocol=eth_type_trans(skb,dev);
 667                         netif_rx(skb); /* deliver it "upstairs" */
 668                         /* count all receives */
 669                         dev->stats.rx_packets++;
 670                         dev->stats.rx_bytes += size;
 671                 }
 672         }
 673
 674         /* Let's peek ahead to see if we have read the last current packet */
 675         /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
 676         curr_page = de620_get_register(dev, R_CPR);
 677         de620_set_register(dev, W_NPRF, next_rx_page);
 678         pr_debug("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page);
 679
 680         return (next_rx_page != curr_page); /* That was slightly tricky... */
 681 }
 682
 683 /*********************************************
 684  *
 685  * Reset the adapter to a known state
 686  *
 687  */
 688 static int adapter_init(struct net_device *dev)
 689 {
 690         int i;
 691         static int was_down;
 692
 693         if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
 694                 EIPRegister = NCTL0;
 695                 if (nic_data.Media != 1)
 696                         EIPRegister |= NIS0;    /* not BNC */
 697         }
 698         else if (nic_data.Model == 2) { /* UTP */
 699                 EIPRegister = NCTL0 | NIS0;
 700         }
 701
 702         if (utp)
 703                 EIPRegister = NCTL0 | NIS0;
 704         if (bnc)
 705                 EIPRegister = NCTL0;
 706
 707         de620_send_command(dev, W_CR | RNOP | CLEAR);
 708         de620_send_command(dev, W_CR | RNOP);
 709
 710         de620_set_register(dev, W_SCR, SCR_DEF);
 711         /* disable recv to wait init */
 712         de620_set_register(dev, W_TCR, RXOFF);
 713
 714         /* Set the node ID in the adapter */
 715         for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
 716                 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
 717         }
 718
 719         de620_set_register(dev, W_EIP, EIPRegister);
 720
 721         next_rx_page = first_rx_page = DE620_RX_START_PAGE;
 722         if (nic_data.RAM_Size)
 723                 last_rx_page = nic_data.RAM_Size - 1;
 724         else /* 64k RAM */
 725                 last_rx_page = 255;
 726
 727         de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
 728         de620_set_register(dev, W_EPR, last_rx_page);  /* End Page Register */
 729         de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
 730         de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
 731         de620_send_command(dev, W_DUMMY);
 732         de620_set_delay(dev);
 733
 734         /* Final sanity check: Anybody out there? */
 735         /* Let's hope some bits from the statusregister make a good check */
 736 #define CHECK_MASK (  0 | TXSUC |  T16  |  0  | RXCRC | RXSHORT |  0  |  0  )
 737 #define CHECK_OK   (  0 |   0   |  0    |  0  |   0   |   0     |  0  |  0  )
 738         /* success:   X     0      0       X      0       0        X     X  */
 739         /* ignore:   EEDI                RXGOOD                   COLS  LNKS*/
 740
 741         if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
 742                 printk(KERN_ERR "%s: Something has happened to the DE-620!  Please check it"
 743 #ifdef SHUTDOWN_WHEN_LOST
 744                         " and do a new ifconfig"
 745 #endif
 746                         "! (%02x)\n", dev->name, i);
 747 #ifdef SHUTDOWN_WHEN_LOST
 748                 /* Goodbye, cruel world... */
 749                 dev->flags &= ~IFF_UP;
 750                 de620_close(dev);
 751 #endif
 752                 was_down = 1;
 753                 return 1; /* failed */
 754         }
 755         if (was_down) {
 756                 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
 757                 was_down = 0;
 758         }
 759
 760         /* All OK, go ahead... */
 761         de620_set_register(dev, W_TCR, TCR_DEF);
 762
 763         return 0; /* all ok */
 764 }
 765
 766 static const struct net_device_ops de620_netdev_ops = {
 767         .ndo_open               = de620_open,
 768         .ndo_stop               = de620_close,
 769         .ndo_start_xmit         = de620_start_xmit,
 770         .ndo_tx_timeout         = de620_timeout,
 771         .ndo_set_multicast_list = de620_set_multicast_list,
 772         .ndo_change_mtu         = eth_change_mtu,
 773         .ndo_set_mac_address    = eth_mac_addr,
 774         .ndo_validate_addr      = eth_validate_addr,
 775 };
 776
 777 /******************************************************************************
 778  *
 779  * Only start-up code below
 780  *
 781  */
 782 /****************************************
 783  *
 784  * Check if there is a DE-620 connected
 785  */
 786 struct net_device * __init de620_probe(int unit)
 787 {
 788         byte checkbyte = 0xa5;
 789         struct net_device *dev;
 790         int err = -ENOMEM;
 791         int i;
 792
 793         dev = alloc_etherdev(0);
 794         if (!dev)
 795                 goto out;
 796
 797         spin_lock_init(&de620_lock);
 798
 799         /*
 800          * This is where the base_addr and irq gets set.
 801          * Tunable at compile-time and insmod-time
 802          */
 803         dev->base_addr = io;
 804         dev->irq       = irq;
 805
 806         /* allow overriding parameters on command line */
 807         if (unit >= 0) {
 808                 sprintf(dev->name, "eth%d", unit);
 809                 netdev_boot_setup_check(dev);
 810         }
 811
 812         pr_debug("%s", version);
 813
 814         printk(KERN_INFO "D-Link DE-620 pocket adapter");
 815
 816         if (!request_region(dev->base_addr, 3, "de620")) {
 817                 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
 818                 err = -EBUSY;
 819                 goto out1;
 820         }
 821
 822         /* Initially, configure basic nibble mode, so we can read the EEPROM */
 823         NIC_Cmd = DEF_NIC_CMD;
 824         de620_set_register(dev, W_EIP, EIPRegister);
 825
 826         /* Anybody out there? */
 827         de620_set_register(dev, W_CPR, checkbyte);
 828         checkbyte = de620_get_register(dev, R_CPR);
 829
 830         if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
 831                 printk(" not identified in the printer port\n");
 832                 err = -ENODEV;
 833                 goto out2;
 834         }
 835
 836         /* else, got it! */
 837         dev->dev_addr[0] = nic_data.NodeID[0];
 838         for (i = 1; i < ETH_ALEN; i++) {
 839                 dev->dev_addr[i] = nic_data.NodeID[i];
 840                 dev->broadcast[i] = 0xff;
 841         }
 842
 843         printk(", Ethernet Address: %pM", dev->dev_addr);
 844
 845         printk(" (%dk RAM,",
 846                 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
 847
 848         if (nic_data.Media == 1)
 849                 printk(" BNC)\n");
 850         else
 851                 printk(" UTP)\n");
 852
 853         dev->netdev_ops = &de620_netdev_ops;
 854         dev->watchdog_timeo     = HZ*2;
 855
 856         /* base_addr and irq are already set, see above! */
 857
 858         /* dump eeprom */
 859         pr_debug("\nEEPROM contents:\n"
 860                 "RAM_Size = 0x%02X\n"
 861                 "NodeID = %pM\n"
 862                 "Model = %d\n"
 863                 "Media = %d\n"
 864                 "SCR = 0x%02x\n", nic_data.RAM_Size, nic_data.NodeID,
 865                 nic_data.Model, nic_data.Media, nic_data.SCR);
 866
 867         err = register_netdev(dev);
 868         if (err)
 869                 goto out2;
 870         return dev;
 871
 872 out2:
 873         release_region(dev->base_addr, 3);
 874 out1:
 875         free_netdev(dev);
 876 out:
 877         return ERR_PTR(err);
 878 }
 879
 880 /**********************************
 881  *
 882  * Read info from on-board EEPROM
 883  *
 884  * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
 885  */
 886 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
 887
 888 static unsigned short __init ReadAWord(struct net_device *dev, int from)
 889 {
 890         unsigned short data;
 891         int nbits;
 892
 893         /* cs   [__~~] SET SEND STATE */
 894         /* di   [____]                */
 895         /* sck  [_~~_]                */
 896         sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
 897
 898         /* Send the 9-bit address from where we want to read the 16-bit word */
 899         for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
 900                 if (from & 0x0100) { /* bit set? */
 901                         /* cs    [~~~~] SEND 1 */
 902                         /* di    [~~~~]        */
 903                         /* sck   [_~~_]        */
 904                         sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
 905                 }
 906                 else {
 907                         /* cs    [~~~~] SEND 0 */
 908                         /* di    [____]        */
 909                         /* sck   [_~~_]        */
 910                         sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 911                 }
 912         }
 913
 914         /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
 915         for (data = 0, nbits = 16; nbits > 0; --nbits) {
 916                 /* cs    [~~~~] SEND 0 */
 917                 /* di    [____]        */
 918                 /* sck   [_~~_]        */
 919                 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
 920                 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
 921         }
 922         /* cs    [____] RESET SEND STATE */
 923         /* di    [____]                  */
 924         /* sck   [_~~_]                  */
 925         sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
 926
 927         return data;
 928 }
 929
 930 static int __init read_eeprom(struct net_device *dev)
 931 {
 932         unsigned short wrd;
 933
 934         /* D-Link Ethernet addresses are in the series  00:80:c8:7X:XX:XX:XX */
 935         wrd = ReadAWord(dev, 0x1aa);    /* bytes 0 + 1 of NodeID */
 936         if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
 937                 return -1; /* Nope, not a DE-620 */
 938         nic_data.NodeID[0] = wrd & 0xff;
 939         nic_data.NodeID[1] = wrd >> 8;
 940
 941         wrd = ReadAWord(dev, 0x1ab);    /* bytes 2 + 3 of NodeID */
 942         if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
 943                 return -1; /* Nope, not a DE-620 */
 944         nic_data.NodeID[2] = wrd & 0xff;
 945         nic_data.NodeID[3] = wrd >> 8;
 946
 947         wrd = ReadAWord(dev, 0x1ac);    /* bytes 4 + 5 of NodeID */
 948         nic_data.NodeID[4] = wrd & 0xff;
 949         nic_data.NodeID[5] = wrd >> 8;
 950
 951         wrd = ReadAWord(dev, 0x1ad);    /* RAM size in pages (256 bytes). 0 = 64k */
 952         nic_data.RAM_Size = (wrd >> 8);
 953
 954         wrd = ReadAWord(dev, 0x1ae);    /* hardware model (CT = 3) */
 955         nic_data.Model = (wrd & 0xff);
 956
 957         wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
 958         nic_data.Media = (wrd & 0xff);
 959
 960         wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
 961         nic_data.SCR = (wrd >> 8);
 962
 963         return 0; /* no errors */
 964 }
 965
 966 /******************************************************************************
 967  *
 968  * Loadable module skeleton
 969  *
 970  */
 971 #ifdef MODULE
 972 static struct net_device *de620_dev;
 973
 974 int __init init_module(void)
 975 {
 976         de620_dev = de620_probe(-1);
 977         if (IS_ERR(de620_dev))
 978                 return PTR_ERR(de620_dev);
 979         return 0;
 980 }
 981
 982 void cleanup_module(void)
 983 {
 984         unregister_netdev(de620_dev);
 985         release_region(de620_dev->base_addr, 3);
 986         free_netdev(de620_dev);
 987 }
 988 #endif /* MODULE */
 989 MODULE_LICENSE("GPL");