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