git.oblomov.eu Git - linux-2.6/blob - drivers/net/3c505.c

   1 /*
   2  * Linux Ethernet device driver for the 3Com Etherlink Plus (3C505)
   3  *      By Craig Southeren, Juha Laiho and Philip Blundell
   4  *
   5  * 3c505.c      This module implements an interface to the 3Com
   6  *              Etherlink Plus (3c505) Ethernet card. Linux device
   7  *              driver interface reverse engineered from the Linux 3C509
   8  *              device drivers. Some 3C505 information gleaned from
   9  *              the Crynwr packet driver. Still this driver would not
  10  *              be here without 3C505 technical reference provided by
  11  *              3Com.
  12  *
  13  * $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $
  14  *
  15  * Authors:     Linux 3c505 device driver by
  16  *                      Craig Southeren, <craigs@ineluki.apana.org.au>
  17  *              Final debugging by
  18  *                      Andrew Tridgell, <tridge@nimbus.anu.edu.au>
  19  *              Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
  20  *                      Juha Laiho, <jlaiho@ichaos.nullnet.fi>
  21  *              Linux 3C509 driver by
  22  *                      Donald Becker, <becker@super.org>
  23  *                      (Now at <becker@scyld.com>)
  24  *              Crynwr packet driver by
  25  *                      Krishnan Gopalan and Gregg Stefancik,
  26  *                      Clemson University Engineering Computer Operations.
  27  *                      Portions of the code have been adapted from the 3c505
  28  *                         driver for NCSA Telnet by Bruce Orchard and later
  29  *                         modified by Warren Van Houten and krus@diku.dk.
  30  *              3C505 technical information provided by
  31  *                      Terry Murphy, of 3Com Network Adapter Division
  32  *              Linux 1.3.0 changes by
  33  *                      Alan Cox <Alan.Cox@linux.org>
  34  *              More debugging, DMA support, currently maintained by
  35  *                      Philip Blundell <philb@gnu.org>
  36  *              Multicard/soft configurable dma channel/rev 2 hardware support
  37  *                      by Christopher Collins <ccollins@pcug.org.au>
  38  *              Ethtool support (jgarzik), 11/17/2001
  39  */
  40
  41 #define DRV_NAME        "3c505"
  42 #define DRV_VERSION     "1.10a"
  43
  44
  45 /* Theory of operation:
  46  *
  47  * The 3c505 is quite an intelligent board.  All communication with it is done
  48  * by means of Primary Command Blocks (PCBs); these are transferred using PIO
  49  * through the command register.  The card has 256k of on-board RAM, which is
  50  * used to buffer received packets.  It might seem at first that more buffers
  51  * are better, but in fact this isn't true.  From my tests, it seems that
  52  * more than about 10 buffers are unnecessary, and there is a noticeable
  53  * performance hit in having more active on the card.  So the majority of the
  54  * card's memory isn't, in fact, used.  Sadly, the card only has one transmit
  55  * buffer and, short of loading our own firmware into it (which is what some
  56  * drivers resort to) there's nothing we can do about this.
  57  *
  58  * We keep up to 4 "receive packet" commands active on the board at a time.
  59  * When a packet comes in, so long as there is a receive command active, the
  60  * board will send us a "packet received" PCB and then add the data for that
  61  * packet to the DMA queue.  If a DMA transfer is not already in progress, we
  62  * set one up to start uploading the data.  We have to maintain a list of
  63  * backlogged receive packets, because the card may decide to tell us about
  64  * a newly-arrived packet at any time, and we may not be able to start a DMA
  65  * transfer immediately (ie one may already be going on).  We can't NAK the
  66  * PCB, because then it would throw the packet away.
  67  *
  68  * Trying to send a PCB to the card at the wrong moment seems to have bad
  69  * effects.  If we send it a transmit PCB while a receive DMA is happening,
  70  * it will just NAK the PCB and so we will have wasted our time.  Worse, it
  71  * sometimes seems to interrupt the transfer.  The majority of the low-level
  72  * code is protected by one huge semaphore -- "busy" -- which is set whenever
  73  * it probably isn't safe to do anything to the card.  The receive routine
  74  * must gain a lock on "busy" before it can start a DMA transfer, and the
  75  * transmit routine must gain a lock before it sends the first PCB to the card.
  76  * The send_pcb() routine also has an internal semaphore to protect it against
  77  * being re-entered (which would be disastrous) -- this is needed because
  78  * several things can happen asynchronously (re-priming the receiver and
  79  * asking the card for statistics, for example).  send_pcb() will also refuse
  80  * to talk to the card at all if a DMA upload is happening.  The higher-level
  81  * networking code will reschedule a later retry if some part of the driver
  82  * is blocked.  In practice, this doesn't seem to happen very often.
  83  */
  84
  85 /* This driver may now work with revision 2.x hardware, since all the read
  86  * operations on the HCR have been removed (we now keep our own softcopy).
  87  * But I don't have an old card to test it on.
  88  *
  89  * This has had the bad effect that the autoprobe routine is now a bit
  90  * less friendly to other devices.  However, it was never very good.
  91  * before, so I doubt it will hurt anybody.
  92  */
  93
  94 /* The driver is a mess.  I took Craig's and Juha's code, and hacked it firstly
  95  * to make it more reliable, and secondly to add DMA mode.  Many things could
  96  * probably be done better; the concurrency protection is particularly awful.
  97  */
  98
  99 #include <linux/module.h>
 100 #include <linux/kernel.h>
 101 #include <linux/string.h>
 102 #include <linux/interrupt.h>
 103 #include <linux/errno.h>
 104 #include <linux/in.h>
 105 #include <linux/slab.h>
 106 #include <linux/ioport.h>
 107 #include <linux/spinlock.h>
 108 #include <linux/ethtool.h>
 109 #include <linux/delay.h>
 110 #include <linux/bitops.h>
 111
 112 #include <asm/uaccess.h>
 113 #include <asm/io.h>
 114 #include <asm/dma.h>
 115
 116 #include <linux/netdevice.h>
 117 #include <linux/etherdevice.h>
 118 #include <linux/skbuff.h>
 119 #include <linux/init.h>
 120
 121 #include "3c505.h"
 122
 123 /*********************************************************
 124  *
 125  *  define debug messages here as common strings to reduce space
 126  *
 127  *********************************************************/
 128
 129 static const char filename[] = __FILE__;
 130
 131 static const char timeout_msg[] = "*** timeout at %s:%s (line %d) ***\n";
 132 #define TIMEOUT_MSG(lineno) \
 133         printk(timeout_msg, filename,__FUNCTION__,(lineno))
 134
 135 static const char invalid_pcb_msg[] =
 136 "*** invalid pcb length %d at %s:%s (line %d) ***\n";
 137 #define INVALID_PCB_MSG(len) \
 138         printk(invalid_pcb_msg, (len),filename,__FUNCTION__,__LINE__)
 139
 140 static char search_msg[] __initdata = KERN_INFO "%s: Looking for 3c505 adapter at address %#x...";
 141
 142 static char stilllooking_msg[] __initdata = "still looking...";
 143
 144 static char found_msg[] __initdata = "found.\n";
 145
 146 static char notfound_msg[] __initdata = "not found (reason = %d)\n";
 147
 148 static char couldnot_msg[] __initdata = KERN_INFO "%s: 3c505 not found\n";
 149
 150 /*********************************************************
 151  *
 152  *  various other debug stuff
 153  *
 154  *********************************************************/
 155
 156 #ifdef ELP_DEBUG
 157 static int elp_debug = ELP_DEBUG;
 158 #else
 159 static int elp_debug;
 160 #endif
 161 #define debug elp_debug
 162
 163 /*
 164  *  0 = no messages (well, some)
 165  *  1 = messages when high level commands performed
 166  *  2 = messages when low level commands performed
 167  *  3 = messages when interrupts received
 168  */
 169
 170 /*****************************************************************
 171  *
 172  * useful macros
 173  *
 174  *****************************************************************/
 175
 176 #ifndef TRUE
 177 #define TRUE    1
 178 #endif
 179
 180 #ifndef FALSE
 181 #define FALSE   0
 182 #endif
 183
 184
 185 /*****************************************************************
 186  *
 187  * List of I/O-addresses we try to auto-sense
 188  * Last element MUST BE 0!
 189  *****************************************************************/
 190
 191 static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
 192
 193 /* Dma Memory related stuff */
 194
 195 static unsigned long dma_mem_alloc(int size)
 196 {
 197         int order = get_order(size);
 198         return __get_dma_pages(GFP_KERNEL, order);
 199 }
 200
 201
 202 /*****************************************************************
 203  *
 204  * Functions for I/O (note the inline !)
 205  *
 206  *****************************************************************/
 207
 208 static inline unsigned char inb_status(unsigned int base_addr)
 209 {
 210         return inb(base_addr + PORT_STATUS);
 211 }
 212
 213 static inline int inb_command(unsigned int base_addr)
 214 {
 215         return inb(base_addr + PORT_COMMAND);
 216 }
 217
 218 static inline void outb_control(unsigned char val, struct net_device *dev)
 219 {
 220         outb(val, dev->base_addr + PORT_CONTROL);
 221         ((elp_device *)(dev->priv))->hcr_val = val;
 222 }
 223
 224 #define HCR_VAL(x)   (((elp_device *)((x)->priv))->hcr_val)
 225
 226 static inline void outb_command(unsigned char val, unsigned int base_addr)
 227 {
 228         outb(val, base_addr + PORT_COMMAND);
 229 }
 230
 231 static inline unsigned int backlog_next(unsigned int n)
 232 {
 233         return (n + 1) % BACKLOG_SIZE;
 234 }
 235
 236 /*****************************************************************
 237  *
 238  *  useful functions for accessing the adapter
 239  *
 240  *****************************************************************/
 241
 242 /*
 243  * use this routine when accessing the ASF bits as they are
 244  * changed asynchronously by the adapter
 245  */
 246
 247 /* get adapter PCB status */
 248 #define GET_ASF(addr) \
 249         (get_status(addr)&ASF_PCB_MASK)
 250
 251 static inline int get_status(unsigned int base_addr)
 252 {
 253         unsigned long timeout = jiffies + 10*HZ/100;
 254         register int stat1;
 255         do {
 256                 stat1 = inb_status(base_addr);
 257         } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
 258         if (time_after_eq(jiffies, timeout))
 259                 TIMEOUT_MSG(__LINE__);
 260         return stat1;
 261 }
 262
 263 static inline void set_hsf(struct net_device *dev, int hsf)
 264 {
 265         elp_device *adapter = dev->priv;
 266         unsigned long flags;
 267
 268         spin_lock_irqsave(&adapter->lock, flags);
 269         outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
 270         spin_unlock_irqrestore(&adapter->lock, flags);
 271 }
 272
 273 static int start_receive(struct net_device *, pcb_struct *);
 274
 275 inline static void adapter_reset(struct net_device *dev)
 276 {
 277         unsigned long timeout;
 278         elp_device *adapter = dev->priv;
 279         unsigned char orig_hcr = adapter->hcr_val;
 280
 281         outb_control(0, dev);
 282
 283         if (inb_status(dev->base_addr) & ACRF) {
 284                 do {
 285                         inb_command(dev->base_addr);
 286                         timeout = jiffies + 2*HZ/100;
 287                         while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
 288                 } while (inb_status(dev->base_addr) & ACRF);
 289                 set_hsf(dev, HSF_PCB_NAK);
 290         }
 291         outb_control(adapter->hcr_val | ATTN | DIR, dev);
 292         mdelay(10);
 293         outb_control(adapter->hcr_val & ~ATTN, dev);
 294         mdelay(10);
 295         outb_control(adapter->hcr_val | FLSH, dev);
 296         mdelay(10);
 297         outb_control(adapter->hcr_val & ~FLSH, dev);
 298         mdelay(10);
 299
 300         outb_control(orig_hcr, dev);
 301         if (!start_receive(dev, &adapter->tx_pcb))
 302                 printk(KERN_ERR "%s: start receive command failed \n", dev->name);
 303 }
 304
 305 /* Check to make sure that a DMA transfer hasn't timed out.  This should
 306  * never happen in theory, but seems to occur occasionally if the card gets
 307  * prodded at the wrong time.
 308  */
 309 static inline void check_3c505_dma(struct net_device *dev)
 310 {
 311         elp_device *adapter = dev->priv;
 312         if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
 313                 unsigned long flags, f;
 314                 printk(KERN_ERR "%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma));
 315                 spin_lock_irqsave(&adapter->lock, flags);
 316                 adapter->dmaing = 0;
 317                 adapter->busy = 0;
 318
 319                 f=claim_dma_lock();
 320                 disable_dma(dev->dma);
 321                 release_dma_lock(f);
 322
 323                 if (adapter->rx_active)
 324                         adapter->rx_active--;
 325                 outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
 326                 spin_unlock_irqrestore(&adapter->lock, flags);
 327         }
 328 }
 329
 330 /* Primitive functions used by send_pcb() */
 331 static inline unsigned int send_pcb_slow(unsigned int base_addr, unsigned char byte)
 332 {
 333         unsigned long timeout;
 334         outb_command(byte, base_addr);
 335         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
 336                 if (inb_status(base_addr) & HCRE)
 337                         return FALSE;
 338         }
 339         printk(KERN_WARNING "3c505: send_pcb_slow timed out\n");
 340         return TRUE;
 341 }
 342
 343 static inline unsigned int send_pcb_fast(unsigned int base_addr, unsigned char byte)
 344 {
 345         unsigned int timeout;
 346         outb_command(byte, base_addr);
 347         for (timeout = 0; timeout < 40000; timeout++) {
 348                 if (inb_status(base_addr) & HCRE)
 349                         return FALSE;
 350         }
 351         printk(KERN_WARNING "3c505: send_pcb_fast timed out\n");
 352         return TRUE;
 353 }
 354
 355 /* Check to see if the receiver needs restarting, and kick it if so */
 356 static inline void prime_rx(struct net_device *dev)
 357 {
 358         elp_device *adapter = dev->priv;
 359         while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
 360                 if (!start_receive(dev, &adapter->itx_pcb))
 361                         break;
 362         }
 363 }
 364
 365 /*****************************************************************
 366  *
 367  * send_pcb
 368  *   Send a PCB to the adapter.
 369  *
 370  *      output byte to command reg  --<--+
 371  *      wait until HCRE is non zero      |
 372  *      loop until all bytes sent   -->--+
 373  *      set HSF1 and HSF2 to 1
 374  *      output pcb length
 375  *      wait until ASF give ACK or NAK
 376  *      set HSF1 and HSF2 to 0
 377  *
 378  *****************************************************************/
 379
 380 /* This can be quite slow -- the adapter is allowed to take up to 40ms
 381  * to respond to the initial interrupt.
 382  *
 383  * We run initially with interrupts turned on, but with a semaphore set
 384  * so that nobody tries to re-enter this code.  Once the first byte has
 385  * gone through, we turn interrupts off and then send the others (the
 386  * timeout is reduced to 500us).
 387  */
 388
 389 static int send_pcb(struct net_device *dev, pcb_struct * pcb)
 390 {
 391         int i;
 392         unsigned long timeout;
 393         elp_device *adapter = dev->priv;
 394         unsigned long flags;
 395
 396         check_3c505_dma(dev);
 397
 398         if (adapter->dmaing && adapter->current_dma.direction == 0)
 399                 return FALSE;
 400
 401         /* Avoid contention */
 402         if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
 403                 if (elp_debug >= 3) {
 404                         printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name);
 405                 }
 406                 return FALSE;
 407         }
 408         /*
 409          * load each byte into the command register and
 410          * wait for the HCRE bit to indicate the adapter
 411          * had read the byte
 412          */
 413         set_hsf(dev, 0);
 414
 415         if (send_pcb_slow(dev->base_addr, pcb->command))
 416                 goto abort;
 417
 418         spin_lock_irqsave(&adapter->lock, flags);
 419
 420         if (send_pcb_fast(dev->base_addr, pcb->length))
 421                 goto sti_abort;
 422
 423         for (i = 0; i < pcb->length; i++) {
 424                 if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
 425                         goto sti_abort;
 426         }
 427
 428         outb_control(adapter->hcr_val | 3, dev);        /* signal end of PCB */
 429         outb_command(2 + pcb->length, dev->base_addr);
 430
 431         /* now wait for the acknowledgement */
 432         spin_unlock_irqrestore(&adapter->lock, flags);
 433
 434         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
 435                 switch (GET_ASF(dev->base_addr)) {
 436                 case ASF_PCB_ACK:
 437                         adapter->send_pcb_semaphore = 0;
 438                         return TRUE;
 439
 440                 case ASF_PCB_NAK:
 441 #ifdef ELP_DEBUG
 442                         printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name);
 443 #endif
 444                         goto abort;
 445                 }
 446         }
 447
 448         if (elp_debug >= 1)
 449                 printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
 450         goto abort;
 451
 452       sti_abort:
 453         spin_unlock_irqrestore(&adapter->lock, flags);
 454       abort:
 455         adapter->send_pcb_semaphore = 0;
 456         return FALSE;
 457 }
 458
 459
 460 /*****************************************************************
 461  *
 462  * receive_pcb
 463  *   Read a PCB from the adapter
 464  *
 465  *      wait for ACRF to be non-zero        ---<---+
 466  *      input a byte                               |
 467  *      if ASF1 and ASF2 were not both one         |
 468  *              before byte was read, loop      --->---+
 469  *      set HSF1 and HSF2 for ack
 470  *
 471  *****************************************************************/
 472
 473 static int receive_pcb(struct net_device *dev, pcb_struct * pcb)
 474 {
 475         int i, j;
 476         int total_length;
 477         int stat;
 478         unsigned long timeout;
 479         unsigned long flags;
 480
 481         elp_device *adapter = dev->priv;
 482
 483         set_hsf(dev, 0);
 484
 485         /* get the command code */
 486         timeout = jiffies + 2*HZ/100;
 487         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
 488         if (time_after_eq(jiffies, timeout)) {
 489                 TIMEOUT_MSG(__LINE__);
 490                 return FALSE;
 491         }
 492         pcb->command = inb_command(dev->base_addr);
 493
 494         /* read the data length */
 495         timeout = jiffies + 3*HZ/100;
 496         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
 497         if (time_after_eq(jiffies, timeout)) {
 498                 TIMEOUT_MSG(__LINE__);
 499                 printk(KERN_INFO "%s: status %02x\n", dev->name, stat);
 500                 return FALSE;
 501         }
 502         pcb->length = inb_command(dev->base_addr);
 503
 504         if (pcb->length > MAX_PCB_DATA) {
 505                 INVALID_PCB_MSG(pcb->length);
 506                 adapter_reset(dev);
 507                 return FALSE;
 508         }
 509         /* read the data */
 510         spin_lock_irqsave(&adapter->lock, flags);
 511         i = 0;
 512         do {
 513                 j = 0;
 514                 while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
 515                 pcb->data.raw[i++] = inb_command(dev->base_addr);
 516                 if (i > MAX_PCB_DATA)
 517                         INVALID_PCB_MSG(i);
 518         } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
 519         spin_unlock_irqrestore(&adapter->lock, flags);
 520         if (j >= 20000) {
 521                 TIMEOUT_MSG(__LINE__);
 522                 return FALSE;
 523         }
 524         /* woops, the last "data" byte was really the length! */
 525         total_length = pcb->data.raw[--i];
 526
 527         /* safety check total length vs data length */
 528         if (total_length != (pcb->length + 2)) {
 529                 if (elp_debug >= 2)
 530                         printk(KERN_WARNING "%s: mangled PCB received\n", dev->name);
 531                 set_hsf(dev, HSF_PCB_NAK);
 532                 return FALSE;
 533         }
 534
 535         if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
 536                 if (test_and_set_bit(0, (void *) &adapter->busy)) {
 537                         if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
 538                                 set_hsf(dev, HSF_PCB_NAK);
 539                                 printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
 540                                 pcb->command = 0;
 541                                 return TRUE;
 542                         } else {
 543                                 pcb->command = 0xff;
 544                         }
 545                 }
 546         }
 547         set_hsf(dev, HSF_PCB_ACK);
 548         return TRUE;
 549 }
 550
 551 /******************************************************
 552  *
 553  *  queue a receive command on the adapter so we will get an
 554  *  interrupt when a packet is received.
 555  *
 556  ******************************************************/
 557
 558 static int start_receive(struct net_device *dev, pcb_struct * tx_pcb)
 559 {
 560         int status;
 561         elp_device *adapter = dev->priv;
 562
 563         if (elp_debug >= 3)
 564                 printk(KERN_DEBUG "%s: restarting receiver\n", dev->name);
 565         tx_pcb->command = CMD_RECEIVE_PACKET;
 566         tx_pcb->length = sizeof(struct Rcv_pkt);
 567         tx_pcb->data.rcv_pkt.buf_seg
 568             = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
 569         tx_pcb->data.rcv_pkt.buf_len = 1600;
 570         tx_pcb->data.rcv_pkt.timeout = 0;       /* set timeout to zero */
 571         status = send_pcb(dev, tx_pcb);
 572         if (status)
 573                 adapter->rx_active++;
 574         return status;
 575 }
 576
 577 /******************************************************
 578  *
 579  * extract a packet from the adapter
 580  * this routine is only called from within the interrupt
 581  * service routine, so no cli/sti calls are needed
 582  * note that the length is always assumed to be even
 583  *
 584  ******************************************************/
 585
 586 static void receive_packet(struct net_device *dev, int len)
 587 {
 588         int rlen;
 589         elp_device *adapter = dev->priv;
 590         void *target;
 591         struct sk_buff *skb;
 592         unsigned long flags;
 593
 594         rlen = (len + 1) & ~1;
 595         skb = dev_alloc_skb(rlen + 2);
 596
 597         if (!skb) {
 598                 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
 599                 target = adapter->dma_buffer;
 600                 adapter->current_dma.target = NULL;
 601                 /* FIXME: stats */
 602                 return;
 603         }
 604
 605         skb_reserve(skb, 2);
 606         target = skb_put(skb, rlen);
 607         if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
 608                 adapter->current_dma.target = target;
 609                 target = adapter->dma_buffer;
 610         } else {
 611                 adapter->current_dma.target = NULL;
 612         }
 613
 614         /* if this happens, we die */
 615         if (test_and_set_bit(0, (void *) &adapter->dmaing))
 616                 printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);
 617
 618         skb->dev = dev;
 619         adapter->current_dma.direction = 0;
 620         adapter->current_dma.length = rlen;
 621         adapter->current_dma.skb = skb;
 622         adapter->current_dma.start_time = jiffies;
 623
 624         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
 625
 626         flags=claim_dma_lock();
 627         disable_dma(dev->dma);
 628         clear_dma_ff(dev->dma);
 629         set_dma_mode(dev->dma, 0x04);   /* dma read */
 630         set_dma_addr(dev->dma, isa_virt_to_bus(target));
 631         set_dma_count(dev->dma, rlen);
 632         enable_dma(dev->dma);
 633         release_dma_lock(flags);
 634
 635         if (elp_debug >= 3) {
 636                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
 637         }
 638
 639         if (adapter->rx_active)
 640                 adapter->rx_active--;
 641
 642         if (!adapter->busy)
 643                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
 644 }
 645
 646 /******************************************************
 647  *
 648  * interrupt handler
 649  *
 650  ******************************************************/
 651
 652 static irqreturn_t elp_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr)
 653 {
 654         int len;
 655         int dlen;
 656         int icount = 0;
 657         struct net_device *dev;
 658         elp_device *adapter;
 659         unsigned long timeout;
 660
 661         dev = dev_id;
 662         adapter = (elp_device *) dev->priv;
 663
 664         spin_lock(&adapter->lock);
 665
 666         do {
 667                 /*
 668                  * has a DMA transfer finished?
 669                  */
 670                 if (inb_status(dev->base_addr) & DONE) {
 671                         if (!adapter->dmaing) {
 672                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
 673                         }
 674                         if (elp_debug >= 3) {
 675                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
 676                         }
 677
 678                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
 679                         if (adapter->current_dma.direction) {
 680                                 dev_kfree_skb_irq(adapter->current_dma.skb);
 681                         } else {
 682                                 struct sk_buff *skb = adapter->current_dma.skb;
 683                                 if (skb) {
 684                                         if (adapter->current_dma.target) {
 685                                         /* have already done the skb_put() */
 686                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
 687                                         }
 688                                         skb->protocol = eth_type_trans(skb,dev);
 689                                         adapter->stats.rx_bytes += skb->len;
 690                                         netif_rx(skb);
 691                                         dev->last_rx = jiffies;
 692                                 }
 693                         }
 694                         adapter->dmaing = 0;
 695                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
 696                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
 697                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
 698                                 if (elp_debug >= 2)
 699                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
 700                                 receive_packet(dev, t);
 701                         } else {
 702                                 adapter->busy = 0;
 703                         }
 704                 } else {
 705                         /* has one timed out? */
 706                         check_3c505_dma(dev);
 707                 }
 708
 709                 /*
 710                  * receive a PCB from the adapter
 711                  */
 712                 timeout = jiffies + 3*HZ/100;
 713                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
 714                         if (receive_pcb(dev, &adapter->irx_pcb)) {
 715                                 switch (adapter->irx_pcb.command)
 716                                 {
 717                                 case 0:
 718                                         break;
 719                                         /*
 720                                          * received a packet - this must be handled fast
 721                                          */
 722                                 case 0xff:
 723                                 case CMD_RECEIVE_PACKET_COMPLETE:
 724                                         /* if the device isn't open, don't pass packets up the stack */
 725                                         if (!netif_running(dev))
 726                                                 break;
 727                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
 728                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
 729                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
 730                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
 731                                         } else {
 732                                                 if (elp_debug >= 3) {
 733                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
 734                                                 }
 735                                                 if (adapter->irx_pcb.command == 0xff) {
 736                                                         if (elp_debug >= 2)
 737                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
 738                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
 739                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
 740                                                 } else {
 741                                                         receive_packet(dev, dlen);
 742                                                 }
 743                                                 if (elp_debug >= 3)
 744                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
 745                                         }
 746                                         break;
 747
 748                                         /*
 749                                          * 82586 configured correctly
 750                                          */
 751                                 case CMD_CONFIGURE_82586_RESPONSE:
 752                                         adapter->got[CMD_CONFIGURE_82586] = 1;
 753                                         if (elp_debug >= 3)
 754                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
 755                                         break;
 756
 757                                         /*
 758                                          * Adapter memory configuration
 759                                          */
 760                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
 761                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
 762                                         if (elp_debug >= 3)
 763                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
 764                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 765                                         break;
 766
 767                                         /*
 768                                          * Multicast list loading
 769                                          */
 770                                 case CMD_LOAD_MULTICAST_RESPONSE:
 771                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
 772                                         if (elp_debug >= 3)
 773                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
 774                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 775                                         break;
 776
 777                                         /*
 778                                          * Station address setting
 779                                          */
 780                                 case CMD_SET_ADDRESS_RESPONSE:
 781                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
 782                                         if (elp_debug >= 3)
 783                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
 784                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 785                                         break;
 786
 787
 788                                         /*
 789                                          * received board statistics
 790                                          */
 791                                 case CMD_NETWORK_STATISTICS_RESPONSE:
 792                                         adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
 793                                         adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
 794                                         adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
 795                                         adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
 796                                         adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
 797                                         adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
 798                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
 799                                         if (elp_debug >= 3)
 800                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
 801                                         break;
 802
 803                                         /*
 804                                          * sent a packet
 805                                          */
 806                                 case CMD_TRANSMIT_PACKET_COMPLETE:
 807                                         if (elp_debug >= 3)
 808                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
 809                                         if (!netif_running(dev))
 810                                                 break;
 811                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
 812                                         case 0xffff:
 813                                                 adapter->stats.tx_aborted_errors++;
 814                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
 815                                                 break;
 816                                         case 0xfffe:
 817                                                 adapter->stats.tx_fifo_errors++;
 818                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
 819                                                 break;
 820                                         }
 821                                         netif_wake_queue(dev);
 822                                         break;
 823
 824                                         /*
 825                                          * some unknown PCB
 826                                          */
 827                                 default:
 828                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
 829                                         break;
 830                                 }
 831                         } else {
 832                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
 833                                 adapter_reset(dev);
 834                         }
 835                 }
 836
 837         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
 838
 839         prime_rx(dev);
 840
 841         /*
 842          * indicate no longer in interrupt routine
 843          */
 844         spin_unlock(&adapter->lock);
 845         return IRQ_HANDLED;
 846 }
 847
 848
 849 /******************************************************
 850  *
 851  * open the board
 852  *
 853  ******************************************************/
 854
 855 static int elp_open(struct net_device *dev)
 856 {
 857         elp_device *adapter;
 858         int retval;
 859
 860         adapter = dev->priv;
 861
 862         if (elp_debug >= 3)
 863                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
 864
 865         /*
 866          * make sure we actually found the device
 867          */
 868         if (adapter == NULL) {
 869                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
 870                 return -EAGAIN;
 871         }
 872         /*
 873          * disable interrupts on the board
 874          */
 875         outb_control(0, dev);
 876
 877         /*
 878          * clear any pending interrupts
 879          */
 880         inb_command(dev->base_addr);
 881         adapter_reset(dev);
 882
 883         /*
 884          * no receive PCBs active
 885          */
 886         adapter->rx_active = 0;
 887
 888         adapter->busy = 0;
 889         adapter->send_pcb_semaphore = 0;
 890         adapter->rx_backlog.in = 0;
 891         adapter->rx_backlog.out = 0;
 892
 893         spin_lock_init(&adapter->lock);
 894
 895         /*
 896          * install our interrupt service routine
 897          */
 898         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
 899                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
 900                 return retval;
 901         }
 902         if ((retval = request_dma(dev->dma, dev->name))) {
 903                 free_irq(dev->irq, dev);
 904                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
 905                 return retval;
 906         }
 907         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
 908         if (!adapter->dma_buffer) {
 909                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
 910                 free_dma(dev->dma);
 911                 free_irq(dev->irq, dev);
 912                 return -ENOMEM;
 913         }
 914         adapter->dmaing = 0;
 915
 916         /*
 917          * enable interrupts on the board
 918          */
 919         outb_control(CMDE, dev);
 920
 921         /*
 922          * configure adapter memory: we need 10 multicast addresses, default==0
 923          */
 924         if (elp_debug >= 3)
 925                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
 926         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
 927         adapter->tx_pcb.data.memconf.cmd_q = 10;
 928         adapter->tx_pcb.data.memconf.rcv_q = 20;
 929         adapter->tx_pcb.data.memconf.mcast = 10;
 930         adapter->tx_pcb.data.memconf.frame = 20;
 931         adapter->tx_pcb.data.memconf.rcv_b = 20;
 932         adapter->tx_pcb.data.memconf.progs = 0;
 933         adapter->tx_pcb.length = sizeof(struct Memconf);
 934         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
 935         if (!send_pcb(dev, &adapter->tx_pcb))
 936                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
 937         else {
 938                 unsigned long timeout = jiffies + TIMEOUT;
 939                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
 940                 if (time_after_eq(jiffies, timeout))
 941                         TIMEOUT_MSG(__LINE__);
 942         }
 943
 944
 945         /*
 946          * configure adapter to receive broadcast messages and wait for response
 947          */
 948         if (elp_debug >= 3)
 949                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
 950         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
 951         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
 952         adapter->tx_pcb.length = 2;
 953         adapter->got[CMD_CONFIGURE_82586] = 0;
 954         if (!send_pcb(dev, &adapter->tx_pcb))
 955                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
 956         else {
 957                 unsigned long timeout = jiffies + TIMEOUT;
 958                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
 959                 if (time_after_eq(jiffies, timeout))
 960                         TIMEOUT_MSG(__LINE__);
 961         }
 962
 963         /* enable burst-mode DMA */
 964         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
 965
 966         /*
 967          * queue receive commands to provide buffering
 968          */
 969         prime_rx(dev);
 970         if (elp_debug >= 3)
 971                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
 972
 973         /*
 974          * device is now officially open!
 975          */
 976
 977         netif_start_queue(dev);
 978         return 0;
 979 }
 980
 981
 982 /******************************************************
 983  *
 984  * send a packet to the adapter
 985  *
 986  ******************************************************/
 987
 988 static int send_packet(struct net_device *dev, struct sk_buff *skb)
 989 {
 990         elp_device *adapter = dev->priv;
 991         unsigned long target;
 992         unsigned long flags;
 993
 994         /*
 995          * make sure the length is even and no shorter than 60 bytes
 996          */
 997         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
 998
 999         if (test_and_set_bit(0, (void *) &adapter->busy)) {
1000                 if (elp_debug >= 2)
1001                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
1002                 return FALSE;
1003         }
1004
1005         adapter->stats.tx_bytes += nlen;
1006
1007         /*
1008          * send the adapter a transmit packet command. Ignore segment and offset
1009          * and make sure the length is even
1010          */
1011         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1012         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1013         adapter->tx_pcb.data.xmit_pkt.buf_ofs
1014             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
1015         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1016
1017         if (!send_pcb(dev, &adapter->tx_pcb)) {
1018                 adapter->busy = 0;
1019                 return FALSE;
1020         }
1021         /* if this happens, we die */
1022         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1023                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1024
1025         adapter->current_dma.direction = 1;
1026         adapter->current_dma.start_time = jiffies;
1027
1028         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1029                 memcpy(adapter->dma_buffer, skb->data, nlen);
1030                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1031                 target = isa_virt_to_bus(adapter->dma_buffer);
1032         }
1033         else {
1034                 target = isa_virt_to_bus(skb->data);
1035         }
1036         adapter->current_dma.skb = skb;
1037
1038         flags=claim_dma_lock();
1039         disable_dma(dev->dma);
1040         clear_dma_ff(dev->dma);
1041         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1042         set_dma_addr(dev->dma, target);
1043         set_dma_count(dev->dma, nlen);
1044         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1045         enable_dma(dev->dma);
1046         release_dma_lock(flags);
1047
1048         if (elp_debug >= 3)
1049                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1050
1051         return TRUE;
1052 }
1053
1054 /*
1055  *      The upper layer thinks we timed out
1056  */
1057
1058 static void elp_timeout(struct net_device *dev)
1059 {
1060         elp_device *adapter = dev->priv;
1061         int stat;
1062
1063         stat = inb_status(dev->base_addr);
1064         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1065         if (elp_debug >= 1)
1066                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1067         dev->trans_start = jiffies;
1068         adapter->stats.tx_dropped++;
1069         netif_wake_queue(dev);
1070 }
1071
1072 /******************************************************
1073  *
1074  * start the transmitter
1075  *    return 0 if sent OK, else return 1
1076  *
1077  ******************************************************/
1078
1079 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1080 {
1081         unsigned long flags;
1082         elp_device *adapter = dev->priv;
1083
1084         spin_lock_irqsave(&adapter->lock, flags);
1085         check_3c505_dma(dev);
1086
1087         if (elp_debug >= 3)
1088                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1089
1090         netif_stop_queue(dev);
1091
1092         /*
1093          * send the packet at skb->data for skb->len
1094          */
1095         if (!send_packet(dev, skb)) {
1096                 if (elp_debug >= 2) {
1097                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1098                 }
1099                 spin_unlock_irqrestore(&adapter->lock, flags);
1100                 return 1;
1101         }
1102         if (elp_debug >= 3)
1103                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1104
1105         /*
1106          * start the transmit timeout
1107          */
1108         dev->trans_start = jiffies;
1109
1110         prime_rx(dev);
1111         spin_unlock_irqrestore(&adapter->lock, flags);
1112         netif_start_queue(dev);
1113         return 0;
1114 }
1115
1116 /******************************************************
1117  *
1118  * return statistics on the board
1119  *
1120  ******************************************************/
1121
1122 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1123 {
1124         elp_device *adapter = (elp_device *) dev->priv;
1125
1126         if (elp_debug >= 3)
1127                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1128
1129         /* If the device is closed, just return the latest stats we have,
1130            - we cannot ask from the adapter without interrupts */
1131         if (!netif_running(dev))
1132                 return &adapter->stats;
1133
1134         /* send a get statistics command to the board */
1135         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1136         adapter->tx_pcb.length = 0;
1137         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1138         if (!send_pcb(dev, &adapter->tx_pcb))
1139                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1140         else {
1141                 unsigned long timeout = jiffies + TIMEOUT;
1142                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1143                 if (time_after_eq(jiffies, timeout)) {
1144                         TIMEOUT_MSG(__LINE__);
1145                         return &adapter->stats;
1146                 }
1147         }
1148
1149         /* statistics are now up to date */
1150         return &adapter->stats;
1151 }
1152
1153
1154 static void netdev_get_drvinfo(struct net_device *dev,
1155                                struct ethtool_drvinfo *info)
1156 {
1157         strcpy(info->driver, DRV_NAME);
1158         strcpy(info->version, DRV_VERSION);
1159         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1160 }
1161
1162 static u32 netdev_get_msglevel(struct net_device *dev)
1163 {
1164         return debug;
1165 }
1166
1167 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1168 {
1169         debug = level;
1170 }
1171
1172 static struct ethtool_ops netdev_ethtool_ops = {
1173         .get_drvinfo            = netdev_get_drvinfo,
1174         .get_msglevel           = netdev_get_msglevel,
1175         .set_msglevel           = netdev_set_msglevel,
1176 };
1177
1178 /******************************************************
1179  *
1180  * close the board
1181  *
1182  ******************************************************/
1183
1184 static int elp_close(struct net_device *dev)
1185 {
1186         elp_device *adapter;
1187
1188         adapter = dev->priv;
1189
1190         if (elp_debug >= 3)
1191                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1192
1193         netif_stop_queue(dev);
1194
1195         /* Someone may request the device statistic information even when
1196          * the interface is closed. The following will update the statistics
1197          * structure in the driver, so we'll be able to give current statistics.
1198          */
1199         (void) elp_get_stats(dev);
1200
1201         /*
1202          * disable interrupts on the board
1203          */
1204         outb_control(0, dev);
1205
1206         /*
1207          * release the IRQ
1208          */
1209         free_irq(dev->irq, dev);
1210
1211         free_dma(dev->dma);
1212         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1213
1214         return 0;
1215 }
1216
1217
1218 /************************************************************
1219  *
1220  * Set multicast list
1221  * num_addrs==0: clear mc_list
1222  * num_addrs==-1: set promiscuous mode
1223  * num_addrs>0: set mc_list
1224  *
1225  ************************************************************/
1226
1227 static void elp_set_mc_list(struct net_device *dev)
1228 {
1229         elp_device *adapter = (elp_device *) dev->priv;
1230         struct dev_mc_list *dmi = dev->mc_list;
1231         int i;
1232         unsigned long flags;
1233
1234         if (elp_debug >= 3)
1235                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1236
1237         spin_lock_irqsave(&adapter->lock, flags);
1238
1239         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1240                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1241                 /* if num_addrs==0 the list will be cleared */
1242                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1243                 adapter->tx_pcb.length = 6 * dev->mc_count;
1244                 for (i = 0; i < dev->mc_count; i++) {
1245                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1246                         dmi = dmi->next;
1247                 }
1248                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1249                 if (!send_pcb(dev, &adapter->tx_pcb))
1250                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1251                 else {
1252                         unsigned long timeout = jiffies + TIMEOUT;
1253                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1254                         if (time_after_eq(jiffies, timeout)) {
1255                                 TIMEOUT_MSG(__LINE__);
1256                         }
1257                 }
1258                 if (dev->mc_count)
1259                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1260                 else            /* num_addrs == 0 */
1261                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1262         } else
1263                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1264         /*
1265          * configure adapter to receive messages (as specified above)
1266          * and wait for response
1267          */
1268         if (elp_debug >= 3)
1269                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1270         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1271         adapter->tx_pcb.length = 2;
1272         adapter->got[CMD_CONFIGURE_82586] = 0;
1273         if (!send_pcb(dev, &adapter->tx_pcb))
1274         {
1275                 spin_unlock_irqrestore(&adapter->lock, flags);
1276                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1277         }
1278         else {
1279                 unsigned long timeout = jiffies + TIMEOUT;
1280                 spin_unlock_irqrestore(&adapter->lock, flags);
1281                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1282                 if (time_after_eq(jiffies, timeout))
1283                         TIMEOUT_MSG(__LINE__);
1284         }
1285 }
1286
1287 /************************************************************
1288  *
1289  * A couple of tests to see if there's 3C505 or not
1290  * Called only by elp_autodetect
1291  ************************************************************/
1292
1293 static int __init elp_sense(struct net_device *dev)
1294 {
1295         int addr = dev->base_addr;
1296         const char *name = dev->name;
1297         byte orig_HSR;
1298
1299         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1300                 return -ENODEV;
1301
1302         orig_HSR = inb_status(addr);
1303
1304         if (elp_debug > 0)
1305                 printk(search_msg, name, addr);
1306
1307         if (orig_HSR == 0xff) {
1308                 if (elp_debug > 0)
1309                         printk(notfound_msg, 1);
1310                 goto out;
1311         }
1312
1313         /* Wait for a while; the adapter may still be booting up */
1314         if (elp_debug > 0)
1315                 printk(stilllooking_msg);
1316
1317         if (orig_HSR & DIR) {
1318                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1319                 outb(0, dev->base_addr + PORT_CONTROL);
1320                 set_current_state(TASK_UNINTERRUPTIBLE);
1321                 schedule_timeout(30*HZ/100);
1322                 if (inb_status(addr) & DIR) {
1323                         if (elp_debug > 0)
1324                                 printk(notfound_msg, 2);
1325                         goto out;
1326                 }
1327         } else {
1328                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1329                 outb(DIR, dev->base_addr + PORT_CONTROL);
1330                 set_current_state(TASK_UNINTERRUPTIBLE);
1331                 schedule_timeout(30*HZ/100);
1332                 if (!(inb_status(addr) & DIR)) {
1333                         if (elp_debug > 0)
1334                                 printk(notfound_msg, 3);
1335                         goto out;
1336                 }
1337         }
1338         /*
1339          * It certainly looks like a 3c505.
1340          */
1341         if (elp_debug > 0)
1342                 printk(found_msg);
1343
1344         return 0;
1345 out:
1346         release_region(addr, ELP_IO_EXTENT);
1347         return -ENODEV;
1348 }
1349
1350 /*************************************************************
1351  *
1352  * Search through addr_list[] and try to find a 3C505
1353  * Called only by eplus_probe
1354  *************************************************************/
1355
1356 static int __init elp_autodetect(struct net_device *dev)
1357 {
1358         int idx = 0;
1359
1360         /* if base address set, then only check that address
1361            otherwise, run through the table */
1362         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1363                 if (elp_sense(dev) == 0)
1364                         return dev->base_addr;
1365         } else
1366                 while ((dev->base_addr = addr_list[idx++])) {
1367                         if (elp_sense(dev) == 0)
1368                                 return dev->base_addr;
1369                 }
1370
1371         /* could not find an adapter */
1372         if (elp_debug > 0)
1373                 printk(couldnot_msg, dev->name);
1374
1375         return 0;               /* Because of this, the layer above will return -ENODEV */
1376 }
1377
1378
1379 /******************************************************
1380  *
1381  * probe for an Etherlink Plus board at the specified address
1382  *
1383  ******************************************************/
1384
1385 /* There are three situations we need to be able to detect here:
1386
1387  *  a) the card is idle
1388  *  b) the card is still booting up
1389  *  c) the card is stuck in a strange state (some DOS drivers do this)
1390  *
1391  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1392  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1393  * loop round, and hope for the best.
1394  *
1395  * This is all very unpleasant, but hopefully avoids the problems with the old
1396  * probe code (which had a 15-second delay if the card was idle, and didn't
1397  * work at all if it was in a weird state).
1398  */
1399
1400 static int __init elplus_setup(struct net_device *dev)
1401 {
1402         elp_device *adapter = dev->priv;
1403         int i, tries, tries1, okay;
1404         unsigned long timeout;
1405         unsigned long cookie = 0;
1406         int err = -ENODEV;
1407
1408         SET_MODULE_OWNER(dev);
1409
1410         /*
1411          *  setup adapter structure
1412          */
1413
1414         dev->base_addr = elp_autodetect(dev);
1415         if (!dev->base_addr)
1416                 return -ENODEV;
1417
1418         adapter->send_pcb_semaphore = 0;
1419
1420         for (tries1 = 0; tries1 < 3; tries1++) {
1421                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1422                 /* First try to write just one byte, to see if the card is
1423                  * responding at all normally.
1424                  */
1425                 timeout = jiffies + 5*HZ/100;
1426                 okay = 0;
1427                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1428                 if ((inb_status(dev->base_addr) & HCRE)) {
1429                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1430                         timeout = jiffies + 5*HZ/100;
1431                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1432                         if (inb_status(dev->base_addr) & HCRE)
1433                                 okay = 1;
1434                 }
1435                 if (!okay) {
1436                         /* Nope, it's ignoring the command register.  This means that
1437                          * either it's still booting up, or it's died.
1438                          */
1439                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1440                         if ((inb_status(dev->base_addr) & 7) == 3) {
1441                                 /* If the adapter status is 3, it *could* still be booting.
1442                                  * Give it the benefit of the doubt for 10 seconds.
1443                                  */
1444                                 printk("assuming 3c505 still starting\n");
1445                                 timeout = jiffies + 10*HZ;
1446                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1447                                 if (inb_status(dev->base_addr) & 7) {
1448                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1449                                 } else {
1450                                         okay = 1;  /* It started */
1451                                 }
1452                         } else {
1453                                 /* Otherwise, it must just be in a strange
1454                                  * state.  We probably need to kick it.
1455                                  */
1456                                 printk("3c505 is sulking\n");
1457                         }
1458                 }
1459                 for (tries = 0; tries < 5 && okay; tries++) {
1460
1461                         /*
1462                          * Try to set the Ethernet address, to make sure that the board
1463                          * is working.
1464                          */
1465                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1466                         adapter->tx_pcb.length = 0;
1467                         cookie = probe_irq_on();
1468                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1469                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1470                                 probe_irq_off(cookie);
1471                                 continue;
1472                         }
1473                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1474                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1475                                 probe_irq_off(cookie);
1476                                 continue;
1477                         }
1478                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1479                             (adapter->rx_pcb.length != 6)) {
1480                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1481                                 probe_irq_off(cookie);
1482                                 continue;
1483                         }
1484                         goto okay;
1485                 }
1486                 /* It's broken.  Do a hard reset to re-initialise the board,
1487                  * and try again.
1488                  */
1489                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1490                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1491                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1492         }
1493         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1494         goto out;
1495
1496       okay:
1497         if (dev->irq) {         /* Is there a preset IRQ? */
1498                 int rpt = probe_irq_off(cookie);
1499                 if (dev->irq != rpt) {
1500                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1501                 }
1502                 /* if dev->irq == probe_irq_off(cookie), all is well */
1503         } else                 /* No preset IRQ; just use what we can detect */
1504                 dev->irq = probe_irq_off(cookie);
1505         switch (dev->irq) {    /* Legal, sane? */
1506         case 0:
1507                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1508                        dev->name);
1509                 goto out;
1510         case 1:
1511         case 6:
1512         case 8:
1513         case 13:
1514                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1515                        dev->name, dev->irq);
1516                        goto out;
1517         }
1518         /*
1519          *  Now we have the IRQ number so we can disable the interrupts from
1520          *  the board until the board is opened.
1521          */
1522         outb_control(adapter->hcr_val & ~CMDE, dev);
1523
1524         /*
1525          * copy Ethernet address into structure
1526          */
1527         for (i = 0; i < 6; i++)
1528                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1529
1530         /* find a DMA channel */
1531         if (!dev->dma) {
1532                 if (dev->mem_start) {
1533                         dev->dma = dev->mem_start & 7;
1534                 }
1535                 else {
1536                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1537                         dev->dma = ELP_DMA;
1538                 }
1539         }
1540
1541         /*
1542          * print remainder of startup message
1543          */
1544         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, ",
1545                dev->name, dev->base_addr, dev->irq, dev->dma);
1546         printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
1547                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1548                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1549
1550         /*
1551          * read more information from the adapter
1552          */
1553
1554         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1555         adapter->tx_pcb.length = 0;
1556         if (!send_pcb(dev, &adapter->tx_pcb) ||
1557             !receive_pcb(dev, &adapter->rx_pcb) ||
1558             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1559             (adapter->rx_pcb.length != 10)) {
1560                 printk("not responding to second PCB\n");
1561         }
1562         printk("rev %d.%d, %dk\n", adapter->rx_pcb.data.info.major_vers, adapter->rx_pcb.data.info.minor_vers, adapter->rx_pcb.data.info.RAM_sz);
1563
1564         /*
1565          * reconfigure the adapter memory to better suit our purposes
1566          */
1567         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1568         adapter->tx_pcb.length = 12;
1569         adapter->tx_pcb.data.memconf.cmd_q = 8;
1570         adapter->tx_pcb.data.memconf.rcv_q = 8;
1571         adapter->tx_pcb.data.memconf.mcast = 10;
1572         adapter->tx_pcb.data.memconf.frame = 10;
1573         adapter->tx_pcb.data.memconf.rcv_b = 10;
1574         adapter->tx_pcb.data.memconf.progs = 0;
1575         if (!send_pcb(dev, &adapter->tx_pcb) ||
1576             !receive_pcb(dev, &adapter->rx_pcb) ||
1577             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1578             (adapter->rx_pcb.length != 2)) {
1579                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1580         }
1581         if (adapter->rx_pcb.data.configure) {
1582                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1583         }
1584
1585         dev->open = elp_open;                           /* local */
1586         dev->stop = elp_close;                          /* local */
1587         dev->get_stats = elp_get_stats;                 /* local */
1588         dev->hard_start_xmit = elp_start_xmit;          /* local */
1589         dev->tx_timeout = elp_timeout;                  /* local */
1590         dev->watchdog_timeo = 10*HZ;
1591         dev->set_multicast_list = elp_set_mc_list;      /* local */
1592         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1593
1594         memset(&(adapter->stats), 0, sizeof(struct net_device_stats));
1595         dev->mem_start = dev->mem_end = 0;
1596
1597         err = register_netdev(dev);
1598         if (err)
1599                 goto out;
1600
1601         return 0;
1602 out:
1603         release_region(dev->base_addr, ELP_IO_EXTENT);
1604         return err;
1605 }
1606
1607 #ifndef MODULE
1608 struct net_device * __init elplus_probe(int unit)
1609 {
1610         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1611         int err;
1612         if (!dev)
1613                 return ERR_PTR(-ENOMEM);
1614
1615         sprintf(dev->name, "eth%d", unit);
1616         netdev_boot_setup_check(dev);
1617
1618         err = elplus_setup(dev);
1619         if (err) {
1620                 free_netdev(dev);
1621                 return ERR_PTR(err);
1622         }
1623         return dev;
1624 }
1625
1626 #else
1627 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1628 static int io[ELP_MAX_CARDS];
1629 static int irq[ELP_MAX_CARDS];
1630 static int dma[ELP_MAX_CARDS];
1631 module_param_array(io, int, NULL, 0);
1632 module_param_array(irq, int, NULL, 0);
1633 module_param_array(dma, int, NULL, 0);
1634 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1635 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1636 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1637
1638 int init_module(void)
1639 {
1640         int this_dev, found = 0;
1641
1642         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1643                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1644                 if (!dev)
1645                         break;
1646
1647                 dev->irq = irq[this_dev];
1648                 dev->base_addr = io[this_dev];
1649                 if (dma[this_dev]) {
1650                         dev->dma = dma[this_dev];
1651                 } else {
1652                         dev->dma = ELP_DMA;
1653                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1654                 }
1655                 if (io[this_dev] == 0) {
1656                         if (this_dev) {
1657                                 free_netdev(dev);
1658                                 break;
1659                         }
1660                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1661                 }
1662                 if (elplus_setup(dev) != 0) {
1663                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1664                         free_netdev(dev);
1665                         break;
1666                 }
1667                 dev_3c505[this_dev] = dev;
1668                 found++;
1669         }
1670         if (!found)
1671                 return -ENODEV;
1672         return 0;
1673 }
1674
1675 void cleanup_module(void)
1676 {
1677         int this_dev;
1678
1679         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1680                 struct net_device *dev = dev_3c505[this_dev];
1681                 if (dev) {
1682                         unregister_netdev(dev);
1683                         release_region(dev->base_addr, ELP_IO_EXTENT);
1684                         free_netdev(dev);
1685                 }
1686         }
1687 }
1688
1689 #endif                          /* MODULE */
1690 MODULE_LICENSE("GPL");