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 static inline 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         adapter->current_dma.direction = 0;
 619         adapter->current_dma.length = rlen;
 620         adapter->current_dma.skb = skb;
 621         adapter->current_dma.start_time = jiffies;
 622
 623         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
 624
 625         flags=claim_dma_lock();
 626         disable_dma(dev->dma);
 627         clear_dma_ff(dev->dma);
 628         set_dma_mode(dev->dma, 0x04);   /* dma read */
 629         set_dma_addr(dev->dma, isa_virt_to_bus(target));
 630         set_dma_count(dev->dma, rlen);
 631         enable_dma(dev->dma);
 632         release_dma_lock(flags);
 633
 634         if (elp_debug >= 3) {
 635                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
 636         }
 637
 638         if (adapter->rx_active)
 639                 adapter->rx_active--;
 640
 641         if (!adapter->busy)
 642                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
 643 }
 644
 645 /******************************************************
 646  *
 647  * interrupt handler
 648  *
 649  ******************************************************/
 650
 651 static irqreturn_t elp_interrupt(int irq, void *dev_id)
 652 {
 653         int len;
 654         int dlen;
 655         int icount = 0;
 656         struct net_device *dev;
 657         elp_device *adapter;
 658         unsigned long timeout;
 659
 660         dev = dev_id;
 661         adapter = (elp_device *) dev->priv;
 662
 663         spin_lock(&adapter->lock);
 664
 665         do {
 666                 /*
 667                  * has a DMA transfer finished?
 668                  */
 669                 if (inb_status(dev->base_addr) & DONE) {
 670                         if (!adapter->dmaing) {
 671                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
 672                         }
 673                         if (elp_debug >= 3) {
 674                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
 675                         }
 676
 677                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
 678                         if (adapter->current_dma.direction) {
 679                                 dev_kfree_skb_irq(adapter->current_dma.skb);
 680                         } else {
 681                                 struct sk_buff *skb = adapter->current_dma.skb;
 682                                 if (skb) {
 683                                         if (adapter->current_dma.target) {
 684                                         /* have already done the skb_put() */
 685                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
 686                                         }
 687                                         skb->protocol = eth_type_trans(skb,dev);
 688                                         adapter->stats.rx_bytes += skb->len;
 689                                         netif_rx(skb);
 690                                         dev->last_rx = jiffies;
 691                                 }
 692                         }
 693                         adapter->dmaing = 0;
 694                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
 695                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
 696                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
 697                                 if (elp_debug >= 2)
 698                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
 699                                 receive_packet(dev, t);
 700                         } else {
 701                                 adapter->busy = 0;
 702                         }
 703                 } else {
 704                         /* has one timed out? */
 705                         check_3c505_dma(dev);
 706                 }
 707
 708                 /*
 709                  * receive a PCB from the adapter
 710                  */
 711                 timeout = jiffies + 3*HZ/100;
 712                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
 713                         if (receive_pcb(dev, &adapter->irx_pcb)) {
 714                                 switch (adapter->irx_pcb.command)
 715                                 {
 716                                 case 0:
 717                                         break;
 718                                         /*
 719                                          * received a packet - this must be handled fast
 720                                          */
 721                                 case 0xff:
 722                                 case CMD_RECEIVE_PACKET_COMPLETE:
 723                                         /* if the device isn't open, don't pass packets up the stack */
 724                                         if (!netif_running(dev))
 725                                                 break;
 726                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
 727                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
 728                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
 729                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
 730                                         } else {
 731                                                 if (elp_debug >= 3) {
 732                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
 733                                                 }
 734                                                 if (adapter->irx_pcb.command == 0xff) {
 735                                                         if (elp_debug >= 2)
 736                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
 737                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
 738                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
 739                                                 } else {
 740                                                         receive_packet(dev, dlen);
 741                                                 }
 742                                                 if (elp_debug >= 3)
 743                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
 744                                         }
 745                                         break;
 746
 747                                         /*
 748                                          * 82586 configured correctly
 749                                          */
 750                                 case CMD_CONFIGURE_82586_RESPONSE:
 751                                         adapter->got[CMD_CONFIGURE_82586] = 1;
 752                                         if (elp_debug >= 3)
 753                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
 754                                         break;
 755
 756                                         /*
 757                                          * Adapter memory configuration
 758                                          */
 759                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
 760                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
 761                                         if (elp_debug >= 3)
 762                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
 763                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 764                                         break;
 765
 766                                         /*
 767                                          * Multicast list loading
 768                                          */
 769                                 case CMD_LOAD_MULTICAST_RESPONSE:
 770                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
 771                                         if (elp_debug >= 3)
 772                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
 773                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 774                                         break;
 775
 776                                         /*
 777                                          * Station address setting
 778                                          */
 779                                 case CMD_SET_ADDRESS_RESPONSE:
 780                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
 781                                         if (elp_debug >= 3)
 782                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
 783                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 784                                         break;
 785
 786
 787                                         /*
 788                                          * received board statistics
 789                                          */
 790                                 case CMD_NETWORK_STATISTICS_RESPONSE:
 791                                         adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
 792                                         adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
 793                                         adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
 794                                         adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
 795                                         adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
 796                                         adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
 797                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
 798                                         if (elp_debug >= 3)
 799                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
 800                                         break;
 801
 802                                         /*
 803                                          * sent a packet
 804                                          */
 805                                 case CMD_TRANSMIT_PACKET_COMPLETE:
 806                                         if (elp_debug >= 3)
 807                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
 808                                         if (!netif_running(dev))
 809                                                 break;
 810                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
 811                                         case 0xffff:
 812                                                 adapter->stats.tx_aborted_errors++;
 813                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
 814                                                 break;
 815                                         case 0xfffe:
 816                                                 adapter->stats.tx_fifo_errors++;
 817                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
 818                                                 break;
 819                                         }
 820                                         netif_wake_queue(dev);
 821                                         break;
 822
 823                                         /*
 824                                          * some unknown PCB
 825                                          */
 826                                 default:
 827                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
 828                                         break;
 829                                 }
 830                         } else {
 831                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
 832                                 adapter_reset(dev);
 833                         }
 834                 }
 835
 836         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
 837
 838         prime_rx(dev);
 839
 840         /*
 841          * indicate no longer in interrupt routine
 842          */
 843         spin_unlock(&adapter->lock);
 844         return IRQ_HANDLED;
 845 }
 846
 847
 848 /******************************************************
 849  *
 850  * open the board
 851  *
 852  ******************************************************/
 853
 854 static int elp_open(struct net_device *dev)
 855 {
 856         elp_device *adapter;
 857         int retval;
 858
 859         adapter = dev->priv;
 860
 861         if (elp_debug >= 3)
 862                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
 863
 864         /*
 865          * make sure we actually found the device
 866          */
 867         if (adapter == NULL) {
 868                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
 869                 return -EAGAIN;
 870         }
 871         /*
 872          * disable interrupts on the board
 873          */
 874         outb_control(0, dev);
 875
 876         /*
 877          * clear any pending interrupts
 878          */
 879         inb_command(dev->base_addr);
 880         adapter_reset(dev);
 881
 882         /*
 883          * no receive PCBs active
 884          */
 885         adapter->rx_active = 0;
 886
 887         adapter->busy = 0;
 888         adapter->send_pcb_semaphore = 0;
 889         adapter->rx_backlog.in = 0;
 890         adapter->rx_backlog.out = 0;
 891
 892         spin_lock_init(&adapter->lock);
 893
 894         /*
 895          * install our interrupt service routine
 896          */
 897         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
 898                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
 899                 return retval;
 900         }
 901         if ((retval = request_dma(dev->dma, dev->name))) {
 902                 free_irq(dev->irq, dev);
 903                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
 904                 return retval;
 905         }
 906         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
 907         if (!adapter->dma_buffer) {
 908                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
 909                 free_dma(dev->dma);
 910                 free_irq(dev->irq, dev);
 911                 return -ENOMEM;
 912         }
 913         adapter->dmaing = 0;
 914
 915         /*
 916          * enable interrupts on the board
 917          */
 918         outb_control(CMDE, dev);
 919
 920         /*
 921          * configure adapter memory: we need 10 multicast addresses, default==0
 922          */
 923         if (elp_debug >= 3)
 924                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
 925         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
 926         adapter->tx_pcb.data.memconf.cmd_q = 10;
 927         adapter->tx_pcb.data.memconf.rcv_q = 20;
 928         adapter->tx_pcb.data.memconf.mcast = 10;
 929         adapter->tx_pcb.data.memconf.frame = 20;
 930         adapter->tx_pcb.data.memconf.rcv_b = 20;
 931         adapter->tx_pcb.data.memconf.progs = 0;
 932         adapter->tx_pcb.length = sizeof(struct Memconf);
 933         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
 934         if (!send_pcb(dev, &adapter->tx_pcb))
 935                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
 936         else {
 937                 unsigned long timeout = jiffies + TIMEOUT;
 938                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
 939                 if (time_after_eq(jiffies, timeout))
 940                         TIMEOUT_MSG(__LINE__);
 941         }
 942
 943
 944         /*
 945          * configure adapter to receive broadcast messages and wait for response
 946          */
 947         if (elp_debug >= 3)
 948                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
 949         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
 950         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
 951         adapter->tx_pcb.length = 2;
 952         adapter->got[CMD_CONFIGURE_82586] = 0;
 953         if (!send_pcb(dev, &adapter->tx_pcb))
 954                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
 955         else {
 956                 unsigned long timeout = jiffies + TIMEOUT;
 957                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
 958                 if (time_after_eq(jiffies, timeout))
 959                         TIMEOUT_MSG(__LINE__);
 960         }
 961
 962         /* enable burst-mode DMA */
 963         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
 964
 965         /*
 966          * queue receive commands to provide buffering
 967          */
 968         prime_rx(dev);
 969         if (elp_debug >= 3)
 970                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
 971
 972         /*
 973          * device is now officially open!
 974          */
 975
 976         netif_start_queue(dev);
 977         return 0;
 978 }
 979
 980
 981 /******************************************************
 982  *
 983  * send a packet to the adapter
 984  *
 985  ******************************************************/
 986
 987 static int send_packet(struct net_device *dev, struct sk_buff *skb)
 988 {
 989         elp_device *adapter = dev->priv;
 990         unsigned long target;
 991         unsigned long flags;
 992
 993         /*
 994          * make sure the length is even and no shorter than 60 bytes
 995          */
 996         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
 997
 998         if (test_and_set_bit(0, (void *) &adapter->busy)) {
 999                 if (elp_debug >= 2)
1000                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
1001                 return FALSE;
1002         }
1003
1004         adapter->stats.tx_bytes += nlen;
1005
1006         /*
1007          * send the adapter a transmit packet command. Ignore segment and offset
1008          * and make sure the length is even
1009          */
1010         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1011         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1012         adapter->tx_pcb.data.xmit_pkt.buf_ofs
1013             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
1014         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1015
1016         if (!send_pcb(dev, &adapter->tx_pcb)) {
1017                 adapter->busy = 0;
1018                 return FALSE;
1019         }
1020         /* if this happens, we die */
1021         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1022                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1023
1024         adapter->current_dma.direction = 1;
1025         adapter->current_dma.start_time = jiffies;
1026
1027         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1028                 skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
1029                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1030                 target = isa_virt_to_bus(adapter->dma_buffer);
1031         }
1032         else {
1033                 target = isa_virt_to_bus(skb->data);
1034         }
1035         adapter->current_dma.skb = skb;
1036
1037         flags=claim_dma_lock();
1038         disable_dma(dev->dma);
1039         clear_dma_ff(dev->dma);
1040         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1041         set_dma_addr(dev->dma, target);
1042         set_dma_count(dev->dma, nlen);
1043         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1044         enable_dma(dev->dma);
1045         release_dma_lock(flags);
1046
1047         if (elp_debug >= 3)
1048                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1049
1050         return TRUE;
1051 }
1052
1053 /*
1054  *      The upper layer thinks we timed out
1055  */
1056
1057 static void elp_timeout(struct net_device *dev)
1058 {
1059         elp_device *adapter = dev->priv;
1060         int stat;
1061
1062         stat = inb_status(dev->base_addr);
1063         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1064         if (elp_debug >= 1)
1065                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1066         dev->trans_start = jiffies;
1067         adapter->stats.tx_dropped++;
1068         netif_wake_queue(dev);
1069 }
1070
1071 /******************************************************
1072  *
1073  * start the transmitter
1074  *    return 0 if sent OK, else return 1
1075  *
1076  ******************************************************/
1077
1078 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1079 {
1080         unsigned long flags;
1081         elp_device *adapter = dev->priv;
1082
1083         spin_lock_irqsave(&adapter->lock, flags);
1084         check_3c505_dma(dev);
1085
1086         if (elp_debug >= 3)
1087                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1088
1089         netif_stop_queue(dev);
1090
1091         /*
1092          * send the packet at skb->data for skb->len
1093          */
1094         if (!send_packet(dev, skb)) {
1095                 if (elp_debug >= 2) {
1096                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1097                 }
1098                 spin_unlock_irqrestore(&adapter->lock, flags);
1099                 return 1;
1100         }
1101         if (elp_debug >= 3)
1102                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1103
1104         /*
1105          * start the transmit timeout
1106          */
1107         dev->trans_start = jiffies;
1108
1109         prime_rx(dev);
1110         spin_unlock_irqrestore(&adapter->lock, flags);
1111         netif_start_queue(dev);
1112         return 0;
1113 }
1114
1115 /******************************************************
1116  *
1117  * return statistics on the board
1118  *
1119  ******************************************************/
1120
1121 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1122 {
1123         elp_device *adapter = (elp_device *) dev->priv;
1124
1125         if (elp_debug >= 3)
1126                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1127
1128         /* If the device is closed, just return the latest stats we have,
1129            - we cannot ask from the adapter without interrupts */
1130         if (!netif_running(dev))
1131                 return &adapter->stats;
1132
1133         /* send a get statistics command to the board */
1134         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1135         adapter->tx_pcb.length = 0;
1136         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1137         if (!send_pcb(dev, &adapter->tx_pcb))
1138                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1139         else {
1140                 unsigned long timeout = jiffies + TIMEOUT;
1141                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1142                 if (time_after_eq(jiffies, timeout)) {
1143                         TIMEOUT_MSG(__LINE__);
1144                         return &adapter->stats;
1145                 }
1146         }
1147
1148         /* statistics are now up to date */
1149         return &adapter->stats;
1150 }
1151
1152
1153 static void netdev_get_drvinfo(struct net_device *dev,
1154                                struct ethtool_drvinfo *info)
1155 {
1156         strcpy(info->driver, DRV_NAME);
1157         strcpy(info->version, DRV_VERSION);
1158         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1159 }
1160
1161 static u32 netdev_get_msglevel(struct net_device *dev)
1162 {
1163         return debug;
1164 }
1165
1166 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1167 {
1168         debug = level;
1169 }
1170
1171 static const struct ethtool_ops netdev_ethtool_ops = {
1172         .get_drvinfo            = netdev_get_drvinfo,
1173         .get_msglevel           = netdev_get_msglevel,
1174         .set_msglevel           = netdev_set_msglevel,
1175 };
1176
1177 /******************************************************
1178  *
1179  * close the board
1180  *
1181  ******************************************************/
1182
1183 static int elp_close(struct net_device *dev)
1184 {
1185         elp_device *adapter;
1186
1187         adapter = dev->priv;
1188
1189         if (elp_debug >= 3)
1190                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1191
1192         netif_stop_queue(dev);
1193
1194         /* Someone may request the device statistic information even when
1195          * the interface is closed. The following will update the statistics
1196          * structure in the driver, so we'll be able to give current statistics.
1197          */
1198         (void) elp_get_stats(dev);
1199
1200         /*
1201          * disable interrupts on the board
1202          */
1203         outb_control(0, dev);
1204
1205         /*
1206          * release the IRQ
1207          */
1208         free_irq(dev->irq, dev);
1209
1210         free_dma(dev->dma);
1211         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1212
1213         return 0;
1214 }
1215
1216
1217 /************************************************************
1218  *
1219  * Set multicast list
1220  * num_addrs==0: clear mc_list
1221  * num_addrs==-1: set promiscuous mode
1222  * num_addrs>0: set mc_list
1223  *
1224  ************************************************************/
1225
1226 static void elp_set_mc_list(struct net_device *dev)
1227 {
1228         elp_device *adapter = (elp_device *) dev->priv;
1229         struct dev_mc_list *dmi = dev->mc_list;
1230         int i;
1231         unsigned long flags;
1232
1233         if (elp_debug >= 3)
1234                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1235
1236         spin_lock_irqsave(&adapter->lock, flags);
1237
1238         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1239                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1240                 /* if num_addrs==0 the list will be cleared */
1241                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1242                 adapter->tx_pcb.length = 6 * dev->mc_count;
1243                 for (i = 0; i < dev->mc_count; i++) {
1244                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1245                         dmi = dmi->next;
1246                 }
1247                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1248                 if (!send_pcb(dev, &adapter->tx_pcb))
1249                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1250                 else {
1251                         unsigned long timeout = jiffies + TIMEOUT;
1252                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1253                         if (time_after_eq(jiffies, timeout)) {
1254                                 TIMEOUT_MSG(__LINE__);
1255                         }
1256                 }
1257                 if (dev->mc_count)
1258                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1259                 else            /* num_addrs == 0 */
1260                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1261         } else
1262                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1263         /*
1264          * configure adapter to receive messages (as specified above)
1265          * and wait for response
1266          */
1267         if (elp_debug >= 3)
1268                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1269         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1270         adapter->tx_pcb.length = 2;
1271         adapter->got[CMD_CONFIGURE_82586] = 0;
1272         if (!send_pcb(dev, &adapter->tx_pcb))
1273         {
1274                 spin_unlock_irqrestore(&adapter->lock, flags);
1275                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1276         }
1277         else {
1278                 unsigned long timeout = jiffies + TIMEOUT;
1279                 spin_unlock_irqrestore(&adapter->lock, flags);
1280                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1281                 if (time_after_eq(jiffies, timeout))
1282                         TIMEOUT_MSG(__LINE__);
1283         }
1284 }
1285
1286 /************************************************************
1287  *
1288  * A couple of tests to see if there's 3C505 or not
1289  * Called only by elp_autodetect
1290  ************************************************************/
1291
1292 static int __init elp_sense(struct net_device *dev)
1293 {
1294         int addr = dev->base_addr;
1295         const char *name = dev->name;
1296         byte orig_HSR;
1297
1298         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1299                 return -ENODEV;
1300
1301         orig_HSR = inb_status(addr);
1302
1303         if (elp_debug > 0)
1304                 printk(search_msg, name, addr);
1305
1306         if (orig_HSR == 0xff) {
1307                 if (elp_debug > 0)
1308                         printk(notfound_msg, 1);
1309                 goto out;
1310         }
1311
1312         /* Wait for a while; the adapter may still be booting up */
1313         if (elp_debug > 0)
1314                 printk(stilllooking_msg);
1315
1316         if (orig_HSR & DIR) {
1317                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1318                 outb(0, dev->base_addr + PORT_CONTROL);
1319                 msleep(300);
1320                 if (inb_status(addr) & DIR) {
1321                         if (elp_debug > 0)
1322                                 printk(notfound_msg, 2);
1323                         goto out;
1324                 }
1325         } else {
1326                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1327                 outb(DIR, dev->base_addr + PORT_CONTROL);
1328                 msleep(300);
1329                 if (!(inb_status(addr) & DIR)) {
1330                         if (elp_debug > 0)
1331                                 printk(notfound_msg, 3);
1332                         goto out;
1333                 }
1334         }
1335         /*
1336          * It certainly looks like a 3c505.
1337          */
1338         if (elp_debug > 0)
1339                 printk(found_msg);
1340
1341         return 0;
1342 out:
1343         release_region(addr, ELP_IO_EXTENT);
1344         return -ENODEV;
1345 }
1346
1347 /*************************************************************
1348  *
1349  * Search through addr_list[] and try to find a 3C505
1350  * Called only by eplus_probe
1351  *************************************************************/
1352
1353 static int __init elp_autodetect(struct net_device *dev)
1354 {
1355         int idx = 0;
1356
1357         /* if base address set, then only check that address
1358            otherwise, run through the table */
1359         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1360                 if (elp_sense(dev) == 0)
1361                         return dev->base_addr;
1362         } else
1363                 while ((dev->base_addr = addr_list[idx++])) {
1364                         if (elp_sense(dev) == 0)
1365                                 return dev->base_addr;
1366                 }
1367
1368         /* could not find an adapter */
1369         if (elp_debug > 0)
1370                 printk(couldnot_msg, dev->name);
1371
1372         return 0;               /* Because of this, the layer above will return -ENODEV */
1373 }
1374
1375
1376 /******************************************************
1377  *
1378  * probe for an Etherlink Plus board at the specified address
1379  *
1380  ******************************************************/
1381
1382 /* There are three situations we need to be able to detect here:
1383
1384  *  a) the card is idle
1385  *  b) the card is still booting up
1386  *  c) the card is stuck in a strange state (some DOS drivers do this)
1387  *
1388  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1389  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1390  * loop round, and hope for the best.
1391  *
1392  * This is all very unpleasant, but hopefully avoids the problems with the old
1393  * probe code (which had a 15-second delay if the card was idle, and didn't
1394  * work at all if it was in a weird state).
1395  */
1396
1397 static int __init elplus_setup(struct net_device *dev)
1398 {
1399         elp_device *adapter = dev->priv;
1400         int i, tries, tries1, okay;
1401         unsigned long timeout;
1402         unsigned long cookie = 0;
1403         int err = -ENODEV;
1404
1405         SET_MODULE_OWNER(dev);
1406
1407         /*
1408          *  setup adapter structure
1409          */
1410
1411         dev->base_addr = elp_autodetect(dev);
1412         if (!dev->base_addr)
1413                 return -ENODEV;
1414
1415         adapter->send_pcb_semaphore = 0;
1416
1417         for (tries1 = 0; tries1 < 3; tries1++) {
1418                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1419                 /* First try to write just one byte, to see if the card is
1420                  * responding at all normally.
1421                  */
1422                 timeout = jiffies + 5*HZ/100;
1423                 okay = 0;
1424                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1425                 if ((inb_status(dev->base_addr) & HCRE)) {
1426                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1427                         timeout = jiffies + 5*HZ/100;
1428                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1429                         if (inb_status(dev->base_addr) & HCRE)
1430                                 okay = 1;
1431                 }
1432                 if (!okay) {
1433                         /* Nope, it's ignoring the command register.  This means that
1434                          * either it's still booting up, or it's died.
1435                          */
1436                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1437                         if ((inb_status(dev->base_addr) & 7) == 3) {
1438                                 /* If the adapter status is 3, it *could* still be booting.
1439                                  * Give it the benefit of the doubt for 10 seconds.
1440                                  */
1441                                 printk("assuming 3c505 still starting\n");
1442                                 timeout = jiffies + 10*HZ;
1443                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1444                                 if (inb_status(dev->base_addr) & 7) {
1445                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1446                                 } else {
1447                                         okay = 1;  /* It started */
1448                                 }
1449                         } else {
1450                                 /* Otherwise, it must just be in a strange
1451                                  * state.  We probably need to kick it.
1452                                  */
1453                                 printk("3c505 is sulking\n");
1454                         }
1455                 }
1456                 for (tries = 0; tries < 5 && okay; tries++) {
1457
1458                         /*
1459                          * Try to set the Ethernet address, to make sure that the board
1460                          * is working.
1461                          */
1462                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1463                         adapter->tx_pcb.length = 0;
1464                         cookie = probe_irq_on();
1465                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1466                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1467                                 probe_irq_off(cookie);
1468                                 continue;
1469                         }
1470                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1471                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1472                                 probe_irq_off(cookie);
1473                                 continue;
1474                         }
1475                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1476                             (adapter->rx_pcb.length != 6)) {
1477                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1478                                 probe_irq_off(cookie);
1479                                 continue;
1480                         }
1481                         goto okay;
1482                 }
1483                 /* It's broken.  Do a hard reset to re-initialise the board,
1484                  * and try again.
1485                  */
1486                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1487                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1488                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1489         }
1490         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1491         goto out;
1492
1493       okay:
1494         if (dev->irq) {         /* Is there a preset IRQ? */
1495                 int rpt = probe_irq_off(cookie);
1496                 if (dev->irq != rpt) {
1497                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1498                 }
1499                 /* if dev->irq == probe_irq_off(cookie), all is well */
1500         } else                 /* No preset IRQ; just use what we can detect */
1501                 dev->irq = probe_irq_off(cookie);
1502         switch (dev->irq) {    /* Legal, sane? */
1503         case 0:
1504                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1505                        dev->name);
1506                 goto out;
1507         case 1:
1508         case 6:
1509         case 8:
1510         case 13:
1511                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1512                        dev->name, dev->irq);
1513                        goto out;
1514         }
1515         /*
1516          *  Now we have the IRQ number so we can disable the interrupts from
1517          *  the board until the board is opened.
1518          */
1519         outb_control(adapter->hcr_val & ~CMDE, dev);
1520
1521         /*
1522          * copy Ethernet address into structure
1523          */
1524         for (i = 0; i < 6; i++)
1525                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1526
1527         /* find a DMA channel */
1528         if (!dev->dma) {
1529                 if (dev->mem_start) {
1530                         dev->dma = dev->mem_start & 7;
1531                 }
1532                 else {
1533                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1534                         dev->dma = ELP_DMA;
1535                 }
1536         }
1537
1538         /*
1539          * print remainder of startup message
1540          */
1541         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, ",
1542                dev->name, dev->base_addr, dev->irq, dev->dma);
1543         printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
1544                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1545                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1546
1547         /*
1548          * read more information from the adapter
1549          */
1550
1551         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1552         adapter->tx_pcb.length = 0;
1553         if (!send_pcb(dev, &adapter->tx_pcb) ||
1554             !receive_pcb(dev, &adapter->rx_pcb) ||
1555             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1556             (adapter->rx_pcb.length != 10)) {
1557                 printk("not responding to second PCB\n");
1558         }
1559         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);
1560
1561         /*
1562          * reconfigure the adapter memory to better suit our purposes
1563          */
1564         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1565         adapter->tx_pcb.length = 12;
1566         adapter->tx_pcb.data.memconf.cmd_q = 8;
1567         adapter->tx_pcb.data.memconf.rcv_q = 8;
1568         adapter->tx_pcb.data.memconf.mcast = 10;
1569         adapter->tx_pcb.data.memconf.frame = 10;
1570         adapter->tx_pcb.data.memconf.rcv_b = 10;
1571         adapter->tx_pcb.data.memconf.progs = 0;
1572         if (!send_pcb(dev, &adapter->tx_pcb) ||
1573             !receive_pcb(dev, &adapter->rx_pcb) ||
1574             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1575             (adapter->rx_pcb.length != 2)) {
1576                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1577         }
1578         if (adapter->rx_pcb.data.configure) {
1579                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1580         }
1581
1582         dev->open = elp_open;                           /* local */
1583         dev->stop = elp_close;                          /* local */
1584         dev->get_stats = elp_get_stats;                 /* local */
1585         dev->hard_start_xmit = elp_start_xmit;          /* local */
1586         dev->tx_timeout = elp_timeout;                  /* local */
1587         dev->watchdog_timeo = 10*HZ;
1588         dev->set_multicast_list = elp_set_mc_list;      /* local */
1589         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1590
1591         memset(&(adapter->stats), 0, sizeof(struct net_device_stats));
1592         dev->mem_start = dev->mem_end = 0;
1593
1594         err = register_netdev(dev);
1595         if (err)
1596                 goto out;
1597
1598         return 0;
1599 out:
1600         release_region(dev->base_addr, ELP_IO_EXTENT);
1601         return err;
1602 }
1603
1604 #ifndef MODULE
1605 struct net_device * __init elplus_probe(int unit)
1606 {
1607         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1608         int err;
1609         if (!dev)
1610                 return ERR_PTR(-ENOMEM);
1611
1612         sprintf(dev->name, "eth%d", unit);
1613         netdev_boot_setup_check(dev);
1614
1615         err = elplus_setup(dev);
1616         if (err) {
1617                 free_netdev(dev);
1618                 return ERR_PTR(err);
1619         }
1620         return dev;
1621 }
1622
1623 #else
1624 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1625 static int io[ELP_MAX_CARDS];
1626 static int irq[ELP_MAX_CARDS];
1627 static int dma[ELP_MAX_CARDS];
1628 module_param_array(io, int, NULL, 0);
1629 module_param_array(irq, int, NULL, 0);
1630 module_param_array(dma, int, NULL, 0);
1631 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1632 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1633 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1634
1635 int __init init_module(void)
1636 {
1637         int this_dev, found = 0;
1638
1639         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1640                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1641                 if (!dev)
1642                         break;
1643
1644                 dev->irq = irq[this_dev];
1645                 dev->base_addr = io[this_dev];
1646                 if (dma[this_dev]) {
1647                         dev->dma = dma[this_dev];
1648                 } else {
1649                         dev->dma = ELP_DMA;
1650                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1651                 }
1652                 if (io[this_dev] == 0) {
1653                         if (this_dev) {
1654                                 free_netdev(dev);
1655                                 break;
1656                         }
1657                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1658                 }
1659                 if (elplus_setup(dev) != 0) {
1660                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1661                         free_netdev(dev);
1662                         break;
1663                 }
1664                 dev_3c505[this_dev] = dev;
1665                 found++;
1666         }
1667         if (!found)
1668                 return -ENODEV;
1669         return 0;
1670 }
1671
1672 void __exit cleanup_module(void)
1673 {
1674         int this_dev;
1675
1676         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1677                 struct net_device *dev = dev_3c505[this_dev];
1678                 if (dev) {
1679                         unregister_netdev(dev);
1680                         release_region(dev->base_addr, ELP_IO_EXTENT);
1681                         free_netdev(dev);
1682                 }
1683         }
1684 }
1685
1686 #endif                          /* MODULE */
1687 MODULE_LICENSE("GPL");