drivers/net/ethernet/i825xx/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/ioport.h>
 106 #include <linux/spinlock.h>
 107 #include <linux/ethtool.h>
 108 #include <linux/delay.h>
 109 #include <linux/bitops.h>
 110 #include <linux/gfp.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 #define timeout_msg "*** timeout at %s:%s (line %d) ***\n"
 130 #define TIMEOUT_MSG(lineno) \
 131         pr_notice(timeout_msg, __FILE__, __func__, (lineno))
 132
 133 #define invalid_pcb_msg "*** invalid pcb length %d at %s:%s (line %d) ***\n"
 134 #define INVALID_PCB_MSG(len) \
 135         pr_notice(invalid_pcb_msg, (len), __FILE__, __func__, __LINE__)
 136
 137 #define search_msg "%s: Looking for 3c505 adapter at address %#x..."
 138
 139 #define stilllooking_msg "still looking..."
 140
 141 #define found_msg "found.\n"
 142
 143 #define notfound_msg "not found (reason = %d)\n"
 144
 145 #define couldnot_msg "%s: 3c505 not found\n"
 146
 147 /*********************************************************
 148  *
 149  *  various other debug stuff
 150  *
 151  *********************************************************/
 152
 153 #ifdef ELP_DEBUG
 154 static int elp_debug = ELP_DEBUG;
 155 #else
 156 static int elp_debug;
 157 #endif
 158 #define debug elp_debug
 159
 160 /*
 161  *  0 = no messages (well, some)
 162  *  1 = messages when high level commands performed
 163  *  2 = messages when low level commands performed
 164  *  3 = messages when interrupts received
 165  */
 166
 167 /*****************************************************************
 168  *
 169  * List of I/O-addresses we try to auto-sense
 170  * Last element MUST BE 0!
 171  *****************************************************************/
 172
 173 static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
 174
 175 /* Dma Memory related stuff */
 176
 177 static unsigned long dma_mem_alloc(int size)
 178 {
 179         int order = get_order(size);
 180         return __get_dma_pages(GFP_KERNEL, order);
 181 }
 182
 183
 184 /*****************************************************************
 185  *
 186  * Functions for I/O (note the inline !)
 187  *
 188  *****************************************************************/
 189
 190 static inline unsigned char inb_status(unsigned int base_addr)
 191 {
 192         return inb(base_addr + PORT_STATUS);
 193 }
 194
 195 static inline int inb_command(unsigned int base_addr)
 196 {
 197         return inb(base_addr + PORT_COMMAND);
 198 }
 199
 200 static inline void outb_control(unsigned char val, struct net_device *dev)
 201 {
 202         outb(val, dev->base_addr + PORT_CONTROL);
 203         ((elp_device *)(netdev_priv(dev)))->hcr_val = val;
 204 }
 205
 206 #define HCR_VAL(x)   (((elp_device *)(netdev_priv(x)))->hcr_val)
 207
 208 static inline void outb_command(unsigned char val, unsigned int base_addr)
 209 {
 210         outb(val, base_addr + PORT_COMMAND);
 211 }
 212
 213 static inline unsigned int backlog_next(unsigned int n)
 214 {
 215         return (n + 1) % BACKLOG_SIZE;
 216 }
 217
 218 /*****************************************************************
 219  *
 220  *  useful functions for accessing the adapter
 221  *
 222  *****************************************************************/
 223
 224 /*
 225  * use this routine when accessing the ASF bits as they are
 226  * changed asynchronously by the adapter
 227  */
 228
 229 /* get adapter PCB status */
 230 #define GET_ASF(addr) \
 231         (get_status(addr)&ASF_PCB_MASK)
 232
 233 static inline int get_status(unsigned int base_addr)
 234 {
 235         unsigned long timeout = jiffies + 10*HZ/100;
 236         register int stat1;
 237         do {
 238                 stat1 = inb_status(base_addr);
 239         } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
 240         if (time_after_eq(jiffies, timeout))
 241                 TIMEOUT_MSG(__LINE__);
 242         return stat1;
 243 }
 244
 245 static inline void set_hsf(struct net_device *dev, int hsf)
 246 {
 247         elp_device *adapter = netdev_priv(dev);
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&adapter->lock, flags);
 251         outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
 252         spin_unlock_irqrestore(&adapter->lock, flags);
 253 }
 254
 255 static bool start_receive(struct net_device *, pcb_struct *);
 256
 257 static inline void adapter_reset(struct net_device *dev)
 258 {
 259         unsigned long timeout;
 260         elp_device *adapter = netdev_priv(dev);
 261         unsigned char orig_hcr = adapter->hcr_val;
 262
 263         outb_control(0, dev);
 264
 265         if (inb_status(dev->base_addr) & ACRF) {
 266                 do {
 267                         inb_command(dev->base_addr);
 268                         timeout = jiffies + 2*HZ/100;
 269                         while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
 270                 } while (inb_status(dev->base_addr) & ACRF);
 271                 set_hsf(dev, HSF_PCB_NAK);
 272         }
 273         outb_control(adapter->hcr_val | ATTN | DIR, dev);
 274         mdelay(10);
 275         outb_control(adapter->hcr_val & ~ATTN, dev);
 276         mdelay(10);
 277         outb_control(adapter->hcr_val | FLSH, dev);
 278         mdelay(10);
 279         outb_control(adapter->hcr_val & ~FLSH, dev);
 280         mdelay(10);
 281
 282         outb_control(orig_hcr, dev);
 283         if (!start_receive(dev, &adapter->tx_pcb))
 284                 pr_err("%s: start receive command failed\n", dev->name);
 285 }
 286
 287 /* Check to make sure that a DMA transfer hasn't timed out.  This should
 288  * never happen in theory, but seems to occur occasionally if the card gets
 289  * prodded at the wrong time.
 290  */
 291 static inline void check_3c505_dma(struct net_device *dev)
 292 {
 293         elp_device *adapter = netdev_priv(dev);
 294         if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
 295                 unsigned long flags, f;
 296                 pr_err("%s: DMA %s timed out, %d bytes left\n", dev->name,
 297                         adapter->current_dma.direction ? "download" : "upload",
 298                         get_dma_residue(dev->dma));
 299                 spin_lock_irqsave(&adapter->lock, flags);
 300                 adapter->dmaing = 0;
 301                 adapter->busy = 0;
 302
 303                 f=claim_dma_lock();
 304                 disable_dma(dev->dma);
 305                 release_dma_lock(f);
 306
 307                 if (adapter->rx_active)
 308                         adapter->rx_active--;
 309                 outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
 310                 spin_unlock_irqrestore(&adapter->lock, flags);
 311         }
 312 }
 313
 314 /* Primitive functions used by send_pcb() */
 315 static inline bool send_pcb_slow(unsigned int base_addr, unsigned char byte)
 316 {
 317         unsigned long timeout;
 318         outb_command(byte, base_addr);
 319         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
 320                 if (inb_status(base_addr) & HCRE)
 321                         return false;
 322         }
 323         pr_warning("3c505: send_pcb_slow timed out\n");
 324         return true;
 325 }
 326
 327 static inline bool send_pcb_fast(unsigned int base_addr, unsigned char byte)
 328 {
 329         unsigned int timeout;
 330         outb_command(byte, base_addr);
 331         for (timeout = 0; timeout < 40000; timeout++) {
 332                 if (inb_status(base_addr) & HCRE)
 333                         return false;
 334         }
 335         pr_warning("3c505: send_pcb_fast timed out\n");
 336         return true;
 337 }
 338
 339 /* Check to see if the receiver needs restarting, and kick it if so */
 340 static inline void prime_rx(struct net_device *dev)
 341 {
 342         elp_device *adapter = netdev_priv(dev);
 343         while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
 344                 if (!start_receive(dev, &adapter->itx_pcb))
 345                         break;
 346         }
 347 }
 348
 349 /*****************************************************************
 350  *
 351  * send_pcb
 352  *   Send a PCB to the adapter.
 353  *
 354  *      output byte to command reg  --<--+
 355  *      wait until HCRE is non zero      |
 356  *      loop until all bytes sent   -->--+
 357  *      set HSF1 and HSF2 to 1
 358  *      output pcb length
 359  *      wait until ASF give ACK or NAK
 360  *      set HSF1 and HSF2 to 0
 361  *
 362  *****************************************************************/
 363
 364 /* This can be quite slow -- the adapter is allowed to take up to 40ms
 365  * to respond to the initial interrupt.
 366  *
 367  * We run initially with interrupts turned on, but with a semaphore set
 368  * so that nobody tries to re-enter this code.  Once the first byte has
 369  * gone through, we turn interrupts off and then send the others (the
 370  * timeout is reduced to 500us).
 371  */
 372
 373 static bool send_pcb(struct net_device *dev, pcb_struct * pcb)
 374 {
 375         int i;
 376         unsigned long timeout;
 377         elp_device *adapter = netdev_priv(dev);
 378         unsigned long flags;
 379
 380         check_3c505_dma(dev);
 381
 382         if (adapter->dmaing && adapter->current_dma.direction == 0)
 383                 return false;
 384
 385         /* Avoid contention */
 386         if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
 387                 if (elp_debug >= 3) {
 388                         pr_debug("%s: send_pcb entered while threaded\n", dev->name);
 389                 }
 390                 return false;
 391         }
 392         /*
 393          * load each byte into the command register and
 394          * wait for the HCRE bit to indicate the adapter
 395          * had read the byte
 396          */
 397         set_hsf(dev, 0);
 398
 399         if (send_pcb_slow(dev->base_addr, pcb->command))
 400                 goto abort;
 401
 402         spin_lock_irqsave(&adapter->lock, flags);
 403
 404         if (send_pcb_fast(dev->base_addr, pcb->length))
 405                 goto sti_abort;
 406
 407         for (i = 0; i < pcb->length; i++) {
 408                 if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
 409                         goto sti_abort;
 410         }
 411
 412         outb_control(adapter->hcr_val | 3, dev);        /* signal end of PCB */
 413         outb_command(2 + pcb->length, dev->base_addr);
 414
 415         /* now wait for the acknowledgement */
 416         spin_unlock_irqrestore(&adapter->lock, flags);
 417
 418         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
 419                 switch (GET_ASF(dev->base_addr)) {
 420                 case ASF_PCB_ACK:
 421                         adapter->send_pcb_semaphore = 0;
 422                         return true;
 423
 424                 case ASF_PCB_NAK:
 425 #ifdef ELP_DEBUG
 426                         pr_debug("%s: send_pcb got NAK\n", dev->name);
 427 #endif
 428                         goto abort;
 429                 }
 430         }
 431
 432         if (elp_debug >= 1)
 433                 pr_debug("%s: timeout waiting for PCB acknowledge (status %02x)\n",
 434                         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                 pr_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         for (i = 0; i < MAX_PCB_DATA; i++) {
 497                 for (j = 0; j < 20000; j++) {
 498                         stat = get_status(dev->base_addr);
 499                         if (stat & ACRF)
 500                                 break;
 501                 }
 502                 pcb->data.raw[i] = inb_command(dev->base_addr);
 503                 if ((stat & ASF_PCB_MASK) == ASF_PCB_END || j >= 20000)
 504                         break;
 505         }
 506         spin_unlock_irqrestore(&adapter->lock, flags);
 507         if (i >= MAX_PCB_DATA) {
 508                 INVALID_PCB_MSG(i);
 509                 return false;
 510         }
 511         if (j >= 20000) {
 512                 TIMEOUT_MSG(__LINE__);
 513                 return false;
 514         }
 515         /* the last "data" byte was really the length! */
 516         total_length = pcb->data.raw[i];
 517
 518         /* safety check total length vs data length */
 519         if (total_length != (pcb->length + 2)) {
 520                 if (elp_debug >= 2)
 521                         pr_warning("%s: mangled PCB received\n", dev->name);
 522                 set_hsf(dev, HSF_PCB_NAK);
 523                 return false;
 524         }
 525
 526         if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
 527                 if (test_and_set_bit(0, (void *) &adapter->busy)) {
 528                         if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
 529                                 set_hsf(dev, HSF_PCB_NAK);
 530                                 pr_warning("%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
 531                                 pcb->command = 0;
 532                                 return true;
 533                         } else {
 534                                 pcb->command = 0xff;
 535                         }
 536                 }
 537         }
 538         set_hsf(dev, HSF_PCB_ACK);
 539         return true;
 540 }
 541
 542 /******************************************************
 543  *
 544  *  queue a receive command on the adapter so we will get an
 545  *  interrupt when a packet is received.
 546  *
 547  ******************************************************/
 548
 549 static bool start_receive(struct net_device *dev, pcb_struct * tx_pcb)
 550 {
 551         bool status;
 552         elp_device *adapter = netdev_priv(dev);
 553
 554         if (elp_debug >= 3)
 555                 pr_debug("%s: restarting receiver\n", dev->name);
 556         tx_pcb->command = CMD_RECEIVE_PACKET;
 557         tx_pcb->length = sizeof(struct Rcv_pkt);
 558         tx_pcb->data.rcv_pkt.buf_seg
 559             = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
 560         tx_pcb->data.rcv_pkt.buf_len = 1600;
 561         tx_pcb->data.rcv_pkt.timeout = 0;       /* set timeout to zero */
 562         status = send_pcb(dev, tx_pcb);
 563         if (status)
 564                 adapter->rx_active++;
 565         return status;
 566 }
 567
 568 /******************************************************
 569  *
 570  * extract a packet from the adapter
 571  * this routine is only called from within the interrupt
 572  * service routine, so no cli/sti calls are needed
 573  * note that the length is always assumed to be even
 574  *
 575  ******************************************************/
 576
 577 static void receive_packet(struct net_device *dev, int len)
 578 {
 579         int rlen;
 580         elp_device *adapter = netdev_priv(dev);
 581         void *target;
 582         struct sk_buff *skb;
 583         unsigned long flags;
 584
 585         rlen = (len + 1) & ~1;
 586         skb = dev_alloc_skb(rlen + 2);
 587
 588         if (!skb) {
 589                 pr_warning("%s: memory squeeze, dropping packet\n", dev->name);
 590                 target = adapter->dma_buffer;
 591                 adapter->current_dma.target = NULL;
 592                 /* FIXME: stats */
 593                 return;
 594         }
 595
 596         skb_reserve(skb, 2);
 597         target = skb_put(skb, rlen);
 598         if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
 599                 adapter->current_dma.target = target;
 600                 target = adapter->dma_buffer;
 601         } else {
 602                 adapter->current_dma.target = NULL;
 603         }
 604
 605         /* if this happens, we die */
 606         if (test_and_set_bit(0, (void *) &adapter->dmaing))
 607                 pr_err("%s: rx blocked, DMA in progress, dir %d\n",
 608                         dev->name, adapter->current_dma.direction);
 609
 610         adapter->current_dma.direction = 0;
 611         adapter->current_dma.length = rlen;
 612         adapter->current_dma.skb = skb;
 613         adapter->current_dma.start_time = jiffies;
 614
 615         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
 616
 617         flags=claim_dma_lock();
 618         disable_dma(dev->dma);
 619         clear_dma_ff(dev->dma);
 620         set_dma_mode(dev->dma, 0x04);   /* dma read */
 621         set_dma_addr(dev->dma, isa_virt_to_bus(target));
 622         set_dma_count(dev->dma, rlen);
 623         enable_dma(dev->dma);
 624         release_dma_lock(flags);
 625
 626         if (elp_debug >= 3) {
 627                 pr_debug("%s: rx DMA transfer started\n", dev->name);
 628         }
 629
 630         if (adapter->rx_active)
 631                 adapter->rx_active--;
 632
 633         if (!adapter->busy)
 634                 pr_warning("%s: receive_packet called, busy not set.\n", dev->name);
 635 }
 636
 637 /******************************************************
 638  *
 639  * interrupt handler
 640  *
 641  ******************************************************/
 642
 643 static irqreturn_t elp_interrupt(int irq, void *dev_id)
 644 {
 645         int len;
 646         int dlen;
 647         int icount = 0;
 648         struct net_device *dev = dev_id;
 649         elp_device *adapter = netdev_priv(dev);
 650         unsigned long timeout;
 651
 652         spin_lock(&adapter->lock);
 653
 654         do {
 655                 /*
 656                  * has a DMA transfer finished?
 657                  */
 658                 if (inb_status(dev->base_addr) & DONE) {
 659                         if (!adapter->dmaing)
 660                                 pr_warning("%s: phantom DMA completed\n", dev->name);
 661
 662                         if (elp_debug >= 3)
 663                                 pr_debug("%s: %s DMA complete, status %02x\n", dev->name,
 664                                         adapter->current_dma.direction ? "tx" : "rx",
 665                                         inb_status(dev->base_addr));
 666
 667                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
 668                         if (adapter->current_dma.direction) {
 669                                 dev_kfree_skb_irq(adapter->current_dma.skb);
 670                         } else {
 671                                 struct sk_buff *skb = adapter->current_dma.skb;
 672                                 if (skb) {
 673                                         if (adapter->current_dma.target) {
 674                                         /* have already done the skb_put() */
 675                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
 676                                         }
 677                                         skb->protocol = eth_type_trans(skb,dev);
 678                                         dev->stats.rx_bytes += skb->len;
 679                                         netif_rx(skb);
 680                                 }
 681                         }
 682                         adapter->dmaing = 0;
 683                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
 684                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
 685                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
 686                                 if (elp_debug >= 2)
 687                                         pr_debug("%s: receiving backlogged packet (%d)\n", dev->name, t);
 688                                 receive_packet(dev, t);
 689                         } else {
 690                                 adapter->busy = 0;
 691                         }
 692                 } else {
 693                         /* has one timed out? */
 694                         check_3c505_dma(dev);
 695                 }
 696
 697                 /*
 698                  * receive a PCB from the adapter
 699                  */
 700                 timeout = jiffies + 3*HZ/100;
 701                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
 702                         if (receive_pcb(dev, &adapter->irx_pcb)) {
 703                                 switch (adapter->irx_pcb.command)
 704                                 {
 705                                 case 0:
 706                                         break;
 707                                         /*
 708                                          * received a packet - this must be handled fast
 709                                          */
 710                                 case 0xff:
 711                                 case CMD_RECEIVE_PACKET_COMPLETE:
 712                                         /* if the device isn't open, don't pass packets up the stack */
 713                                         if (!netif_running(dev))
 714                                                 break;
 715                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
 716                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
 717                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
 718                                                 pr_err("%s: interrupt - packet not received correctly\n", dev->name);
 719                                         } else {
 720                                                 if (elp_debug >= 3) {
 721                                                         pr_debug("%s: interrupt - packet received of length %i (%i)\n",
 722                                                                 dev->name, len, dlen);
 723                                                 }
 724                                                 if (adapter->irx_pcb.command == 0xff) {
 725                                                         if (elp_debug >= 2)
 726                                                                 pr_debug("%s: adding packet to backlog (len = %d)\n",
 727                                                                         dev->name, dlen);
 728                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
 729                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
 730                                                 } else {
 731                                                         receive_packet(dev, dlen);
 732                                                 }
 733                                                 if (elp_debug >= 3)
 734                                                         pr_debug("%s: packet received\n", dev->name);
 735                                         }
 736                                         break;
 737
 738                                         /*
 739                                          * 82586 configured correctly
 740                                          */
 741                                 case CMD_CONFIGURE_82586_RESPONSE:
 742                                         adapter->got[CMD_CONFIGURE_82586] = 1;
 743                                         if (elp_debug >= 3)
 744                                                 pr_debug("%s: interrupt - configure response received\n", dev->name);
 745                                         break;
 746
 747                                         /*
 748                                          * Adapter memory configuration
 749                                          */
 750                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
 751                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
 752                                         if (elp_debug >= 3)
 753                                                 pr_debug("%s: Adapter memory configuration %s.\n", dev->name,
 754                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 755                                         break;
 756
 757                                         /*
 758                                          * Multicast list loading
 759                                          */
 760                                 case CMD_LOAD_MULTICAST_RESPONSE:
 761                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
 762                                         if (elp_debug >= 3)
 763                                                 pr_debug("%s: Multicast address list loading %s.\n", dev->name,
 764                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 765                                         break;
 766
 767                                         /*
 768                                          * Station address setting
 769                                          */
 770                                 case CMD_SET_ADDRESS_RESPONSE:
 771                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
 772                                         if (elp_debug >= 3)
 773                                                 pr_debug("%s: Ethernet address setting %s.\n", dev->name,
 774                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
 775                                         break;
 776
 777
 778                                         /*
 779                                          * received board statistics
 780                                          */
 781                                 case CMD_NETWORK_STATISTICS_RESPONSE:
 782                                         dev->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
 783                                         dev->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
 784                                         dev->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
 785                                         dev->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
 786                                         dev->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
 787                                         dev->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
 788                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
 789                                         if (elp_debug >= 3)
 790                                                 pr_debug("%s: interrupt - statistics response received\n", dev->name);
 791                                         break;
 792
 793                                         /*
 794                                          * sent a packet
 795                                          */
 796                                 case CMD_TRANSMIT_PACKET_COMPLETE:
 797                                         if (elp_debug >= 3)
 798                                                 pr_debug("%s: interrupt - packet sent\n", dev->name);
 799                                         if (!netif_running(dev))
 800                                                 break;
 801                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
 802                                         case 0xffff:
 803                                                 dev->stats.tx_aborted_errors++;
 804                                                 pr_info("%s: transmit timed out, network cable problem?\n", dev->name);
 805                                                 break;
 806                                         case 0xfffe:
 807                                                 dev->stats.tx_fifo_errors++;
 808                                                 pr_info("%s: transmit timed out, FIFO underrun\n", dev->name);
 809                                                 break;
 810                                         }
 811                                         netif_wake_queue(dev);
 812                                         break;
 813
 814                                         /*
 815                                          * some unknown PCB
 816                                          */
 817                                 default:
 818                                         pr_debug("%s: unknown PCB received - %2.2x\n",
 819                                                 dev->name, adapter->irx_pcb.command);
 820                                         break;
 821                                 }
 822                         } else {
 823                                 pr_warning("%s: failed to read PCB on interrupt\n", dev->name);
 824                                 adapter_reset(dev);
 825                         }
 826                 }
 827
 828         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
 829
 830         prime_rx(dev);
 831
 832         /*
 833          * indicate no longer in interrupt routine
 834          */
 835         spin_unlock(&adapter->lock);
 836         return IRQ_HANDLED;
 837 }
 838
 839
 840 /******************************************************
 841  *
 842  * open the board
 843  *
 844  ******************************************************/
 845
 846 static int elp_open(struct net_device *dev)
 847 {
 848         elp_device *adapter = netdev_priv(dev);
 849         int retval;
 850
 851         if (elp_debug >= 3)
 852                 pr_debug("%s: request to open device\n", dev->name);
 853
 854         /*
 855          * make sure we actually found the device
 856          */
 857         if (adapter == NULL) {
 858                 pr_err("%s: Opening a non-existent physical device\n", dev->name);
 859                 return -EAGAIN;
 860         }
 861         /*
 862          * disable interrupts on the board
 863          */
 864         outb_control(0, dev);
 865
 866         /*
 867          * clear any pending interrupts
 868          */
 869         inb_command(dev->base_addr);
 870         adapter_reset(dev);
 871
 872         /*
 873          * no receive PCBs active
 874          */
 875         adapter->rx_active = 0;
 876
 877         adapter->busy = 0;
 878         adapter->send_pcb_semaphore = 0;
 879         adapter->rx_backlog.in = 0;
 880         adapter->rx_backlog.out = 0;
 881
 882         spin_lock_init(&adapter->lock);
 883
 884         /*
 885          * install our interrupt service routine
 886          */
 887         if ((retval = request_irq(dev->irq, elp_interrupt, 0, dev->name, dev))) {
 888                 pr_err("%s: could not allocate IRQ%d\n", dev->name, dev->irq);
 889                 return retval;
 890         }
 891         if ((retval = request_dma(dev->dma, dev->name))) {
 892                 free_irq(dev->irq, dev);
 893                 pr_err("%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
 894                 return retval;
 895         }
 896         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
 897         if (!adapter->dma_buffer) {
 898                 pr_err("%s: could not allocate DMA buffer\n", dev->name);
 899                 free_dma(dev->dma);
 900                 free_irq(dev->irq, dev);
 901                 return -ENOMEM;
 902         }
 903         adapter->dmaing = 0;
 904
 905         /*
 906          * enable interrupts on the board
 907          */
 908         outb_control(CMDE, dev);
 909
 910         /*
 911          * configure adapter memory: we need 10 multicast addresses, default==0
 912          */
 913         if (elp_debug >= 3)
 914                 pr_debug("%s: sending 3c505 memory configuration command\n", dev->name);
 915         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
 916         adapter->tx_pcb.data.memconf.cmd_q = 10;
 917         adapter->tx_pcb.data.memconf.rcv_q = 20;
 918         adapter->tx_pcb.data.memconf.mcast = 10;
 919         adapter->tx_pcb.data.memconf.frame = 20;
 920         adapter->tx_pcb.data.memconf.rcv_b = 20;
 921         adapter->tx_pcb.data.memconf.progs = 0;
 922         adapter->tx_pcb.length = sizeof(struct Memconf);
 923         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
 924         if (!send_pcb(dev, &adapter->tx_pcb))
 925                 pr_err("%s: couldn't send memory configuration command\n", dev->name);
 926         else {
 927                 unsigned long timeout = jiffies + TIMEOUT;
 928                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
 929                 if (time_after_eq(jiffies, timeout))
 930                         TIMEOUT_MSG(__LINE__);
 931         }
 932
 933
 934         /*
 935          * configure adapter to receive broadcast messages and wait for response
 936          */
 937         if (elp_debug >= 3)
 938                 pr_debug("%s: sending 82586 configure command\n", dev->name);
 939         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
 940         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
 941         adapter->tx_pcb.length = 2;
 942         adapter->got[CMD_CONFIGURE_82586] = 0;
 943         if (!send_pcb(dev, &adapter->tx_pcb))
 944                 pr_err("%s: couldn't send 82586 configure command\n", dev->name);
 945         else {
 946                 unsigned long timeout = jiffies + TIMEOUT;
 947                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
 948                 if (time_after_eq(jiffies, timeout))
 949                         TIMEOUT_MSG(__LINE__);
 950         }
 951
 952         /* enable burst-mode DMA */
 953         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
 954
 955         /*
 956          * queue receive commands to provide buffering
 957          */
 958         prime_rx(dev);
 959         if (elp_debug >= 3)
 960                 pr_debug("%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
 961
 962         /*
 963          * device is now officially open!
 964          */
 965
 966         netif_start_queue(dev);
 967         return 0;
 968 }
 969
 970
 971 /******************************************************
 972  *
 973  * send a packet to the adapter
 974  *
 975  ******************************************************/
 976
 977 static netdev_tx_t send_packet(struct net_device *dev, struct sk_buff *skb)
 978 {
 979         elp_device *adapter = netdev_priv(dev);
 980         unsigned long target;
 981         unsigned long flags;
 982
 983         /*
 984          * make sure the length is even and no shorter than 60 bytes
 985          */
 986         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
 987
 988         if (test_and_set_bit(0, (void *) &adapter->busy)) {
 989                 if (elp_debug >= 2)
 990                         pr_debug("%s: transmit blocked\n", dev->name);
 991                 return false;
 992         }
 993
 994         dev->stats.tx_bytes += nlen;
 995
 996         /*
 997          * send the adapter a transmit packet command. Ignore segment and offset
 998          * and make sure the length is even
 999          */
1000         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1001         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1002         adapter->tx_pcb.data.xmit_pkt.buf_ofs
1003             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
1004         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1005
1006         if (!send_pcb(dev, &adapter->tx_pcb)) {
1007                 adapter->busy = 0;
1008                 return false;
1009         }
1010         /* if this happens, we die */
1011         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1012                 pr_debug("%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1013
1014         adapter->current_dma.direction = 1;
1015         adapter->current_dma.start_time = jiffies;
1016
1017         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1018                 skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
1019                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1020                 target = isa_virt_to_bus(adapter->dma_buffer);
1021         }
1022         else {
1023                 target = isa_virt_to_bus(skb->data);
1024         }
1025         adapter->current_dma.skb = skb;
1026
1027         flags=claim_dma_lock();
1028         disable_dma(dev->dma);
1029         clear_dma_ff(dev->dma);
1030         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1031         set_dma_addr(dev->dma, target);
1032         set_dma_count(dev->dma, nlen);
1033         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1034         enable_dma(dev->dma);
1035         release_dma_lock(flags);
1036
1037         if (elp_debug >= 3)
1038                 pr_debug("%s: DMA transfer started\n", dev->name);
1039
1040         return true;
1041 }
1042
1043 /*
1044  *      The upper layer thinks we timed out
1045  */
1046
1047 static void elp_timeout(struct net_device *dev)
1048 {
1049         int stat;
1050
1051         stat = inb_status(dev->base_addr);
1052         pr_warning("%s: transmit timed out, lost %s?\n", dev->name,
1053                    (stat & ACRF) ? "interrupt" : "command");
1054         if (elp_debug >= 1)
1055                 pr_debug("%s: status %#02x\n", dev->name, stat);
1056         dev->trans_start = jiffies; /* prevent tx timeout */
1057         dev->stats.tx_dropped++;
1058         netif_wake_queue(dev);
1059 }
1060
1061 /******************************************************
1062  *
1063  * start the transmitter
1064  *    return 0 if sent OK, else return 1
1065  *
1066  ******************************************************/
1067
1068 static netdev_tx_t elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1069 {
1070         unsigned long flags;
1071         elp_device *adapter = netdev_priv(dev);
1072
1073         spin_lock_irqsave(&adapter->lock, flags);
1074         check_3c505_dma(dev);
1075
1076         if (elp_debug >= 3)
1077                 pr_debug("%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1078
1079         netif_stop_queue(dev);
1080
1081         /*
1082          * send the packet at skb->data for skb->len
1083          */
1084         if (!send_packet(dev, skb)) {
1085                 if (elp_debug >= 2) {
1086                         pr_debug("%s: failed to transmit packet\n", dev->name);
1087                 }
1088                 spin_unlock_irqrestore(&adapter->lock, flags);
1089                 return NETDEV_TX_BUSY;
1090         }
1091         if (elp_debug >= 3)
1092                 pr_debug("%s: packet of length %d sent\n", dev->name, (int) skb->len);
1093
1094         prime_rx(dev);
1095         spin_unlock_irqrestore(&adapter->lock, flags);
1096         netif_start_queue(dev);
1097         return NETDEV_TX_OK;
1098 }
1099
1100 /******************************************************
1101  *
1102  * return statistics on the board
1103  *
1104  ******************************************************/
1105
1106 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1107 {
1108         elp_device *adapter = netdev_priv(dev);
1109
1110         if (elp_debug >= 3)
1111                 pr_debug("%s: request for stats\n", dev->name);
1112
1113         /* If the device is closed, just return the latest stats we have,
1114            - we cannot ask from the adapter without interrupts */
1115         if (!netif_running(dev))
1116                 return &dev->stats;
1117
1118         /* send a get statistics command to the board */
1119         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1120         adapter->tx_pcb.length = 0;
1121         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1122         if (!send_pcb(dev, &adapter->tx_pcb))
1123                 pr_err("%s: couldn't send get statistics command\n", dev->name);
1124         else {
1125                 unsigned long timeout = jiffies + TIMEOUT;
1126                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1127                 if (time_after_eq(jiffies, timeout)) {
1128                         TIMEOUT_MSG(__LINE__);
1129                         return &dev->stats;
1130                 }
1131         }
1132
1133         /* statistics are now up to date */
1134         return &dev->stats;
1135 }
1136
1137
1138 static void netdev_get_drvinfo(struct net_device *dev,
1139                                struct ethtool_drvinfo *info)
1140 {
1141         strcpy(info->driver, DRV_NAME);
1142         strcpy(info->version, DRV_VERSION);
1143         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1144 }
1145
1146 static u32 netdev_get_msglevel(struct net_device *dev)
1147 {
1148         return debug;
1149 }
1150
1151 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1152 {
1153         debug = level;
1154 }
1155
1156 static const struct ethtool_ops netdev_ethtool_ops = {
1157         .get_drvinfo            = netdev_get_drvinfo,
1158         .get_msglevel           = netdev_get_msglevel,
1159         .set_msglevel           = netdev_set_msglevel,
1160 };
1161
1162 /******************************************************
1163  *
1164  * close the board
1165  *
1166  ******************************************************/
1167
1168 static int elp_close(struct net_device *dev)
1169 {
1170         elp_device *adapter = netdev_priv(dev);
1171
1172         if (elp_debug >= 3)
1173                 pr_debug("%s: request to close device\n", dev->name);
1174
1175         netif_stop_queue(dev);
1176
1177         /* Someone may request the device statistic information even when
1178          * the interface is closed. The following will update the statistics
1179          * structure in the driver, so we'll be able to give current statistics.
1180          */
1181         (void) elp_get_stats(dev);
1182
1183         /*
1184          * disable interrupts on the board
1185          */
1186         outb_control(0, dev);
1187
1188         /*
1189          * release the IRQ
1190          */
1191         free_irq(dev->irq, dev);
1192
1193         free_dma(dev->dma);
1194         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1195
1196         return 0;
1197 }
1198
1199
1200 /************************************************************
1201  *
1202  * Set multicast list
1203  * num_addrs==0: clear mc_list
1204  * num_addrs==-1: set promiscuous mode
1205  * num_addrs>0: set mc_list
1206  *
1207  ************************************************************/
1208
1209 static void elp_set_mc_list(struct net_device *dev)
1210 {
1211         elp_device *adapter = netdev_priv(dev);
1212         struct netdev_hw_addr *ha;
1213         int i;
1214         unsigned long flags;
1215
1216         if (elp_debug >= 3)
1217                 pr_debug("%s: request to set multicast list\n", dev->name);
1218
1219         spin_lock_irqsave(&adapter->lock, flags);
1220
1221         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1222                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1223                 /* if num_addrs==0 the list will be cleared */
1224                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1225                 adapter->tx_pcb.length = 6 * netdev_mc_count(dev);
1226                 i = 0;
1227                 netdev_for_each_mc_addr(ha, dev)
1228                         memcpy(adapter->tx_pcb.data.multicast[i++],
1229                                ha->addr, 6);
1230                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1231                 if (!send_pcb(dev, &adapter->tx_pcb))
1232                         pr_err("%s: couldn't send set_multicast command\n", dev->name);
1233                 else {
1234                         unsigned long timeout = jiffies + TIMEOUT;
1235                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1236                         if (time_after_eq(jiffies, timeout)) {
1237                                 TIMEOUT_MSG(__LINE__);
1238                         }
1239                 }
1240                 if (!netdev_mc_empty(dev))
1241                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1242                 else            /* num_addrs == 0 */
1243                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1244         } else
1245                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1246         /*
1247          * configure adapter to receive messages (as specified above)
1248          * and wait for response
1249          */
1250         if (elp_debug >= 3)
1251                 pr_debug("%s: sending 82586 configure command\n", dev->name);
1252         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1253         adapter->tx_pcb.length = 2;
1254         adapter->got[CMD_CONFIGURE_82586] = 0;
1255         if (!send_pcb(dev, &adapter->tx_pcb))
1256         {
1257                 spin_unlock_irqrestore(&adapter->lock, flags);
1258                 pr_err("%s: couldn't send 82586 configure command\n", dev->name);
1259         }
1260         else {
1261                 unsigned long timeout = jiffies + TIMEOUT;
1262                 spin_unlock_irqrestore(&adapter->lock, flags);
1263                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1264                 if (time_after_eq(jiffies, timeout))
1265                         TIMEOUT_MSG(__LINE__);
1266         }
1267 }
1268
1269 /************************************************************
1270  *
1271  * A couple of tests to see if there's 3C505 or not
1272  * Called only by elp_autodetect
1273  ************************************************************/
1274
1275 static int __init elp_sense(struct net_device *dev)
1276 {
1277         int addr = dev->base_addr;
1278         const char *name = dev->name;
1279         byte orig_HSR;
1280
1281         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1282                 return -ENODEV;
1283
1284         orig_HSR = inb_status(addr);
1285
1286         if (elp_debug > 0)
1287                 pr_debug(search_msg, name, addr);
1288
1289         if (orig_HSR == 0xff) {
1290                 if (elp_debug > 0)
1291                         pr_cont(notfound_msg, 1);
1292                 goto out;
1293         }
1294
1295         /* Wait for a while; the adapter may still be booting up */
1296         if (elp_debug > 0)
1297                 pr_cont(stilllooking_msg);
1298
1299         if (orig_HSR & DIR) {
1300                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1301                 outb(0, dev->base_addr + PORT_CONTROL);
1302                 msleep(300);
1303                 if (inb_status(addr) & DIR) {
1304                         if (elp_debug > 0)
1305                                 pr_cont(notfound_msg, 2);
1306                         goto out;
1307                 }
1308         } else {
1309                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1310                 outb(DIR, dev->base_addr + PORT_CONTROL);
1311                 msleep(300);
1312                 if (!(inb_status(addr) & DIR)) {
1313                         if (elp_debug > 0)
1314                                 pr_cont(notfound_msg, 3);
1315                         goto out;
1316                 }
1317         }
1318         /*
1319          * It certainly looks like a 3c505.
1320          */
1321         if (elp_debug > 0)
1322                 pr_cont(found_msg);
1323
1324         return 0;
1325 out:
1326         release_region(addr, ELP_IO_EXTENT);
1327         return -ENODEV;
1328 }
1329
1330 /*************************************************************
1331  *
1332  * Search through addr_list[] and try to find a 3C505
1333  * Called only by eplus_probe
1334  *************************************************************/
1335
1336 static int __init elp_autodetect(struct net_device *dev)
1337 {
1338         int idx = 0;
1339
1340         /* if base address set, then only check that address
1341            otherwise, run through the table */
1342         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1343                 if (elp_sense(dev) == 0)
1344                         return dev->base_addr;
1345         } else
1346                 while ((dev->base_addr = addr_list[idx++])) {
1347                         if (elp_sense(dev) == 0)
1348                                 return dev->base_addr;
1349                 }
1350
1351         /* could not find an adapter */
1352         if (elp_debug > 0)
1353                 pr_debug(couldnot_msg, dev->name);
1354
1355         return 0;               /* Because of this, the layer above will return -ENODEV */
1356 }
1357
1358 static const struct net_device_ops elp_netdev_ops = {
1359         .ndo_open               = elp_open,
1360         .ndo_stop               = elp_close,
1361         .ndo_get_stats          = elp_get_stats,
1362         .ndo_start_xmit         = elp_start_xmit,
1363         .ndo_tx_timeout         = elp_timeout,
1364         .ndo_set_rx_mode        = elp_set_mc_list,
1365         .ndo_change_mtu         = eth_change_mtu,
1366         .ndo_set_mac_address    = eth_mac_addr,
1367         .ndo_validate_addr      = eth_validate_addr,
1368 };
1369
1370 /******************************************************
1371  *
1372  * probe for an Etherlink Plus board at the specified address
1373  *
1374  ******************************************************/
1375
1376 /* There are three situations we need to be able to detect here:
1377
1378  *  a) the card is idle
1379  *  b) the card is still booting up
1380  *  c) the card is stuck in a strange state (some DOS drivers do this)
1381  *
1382  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1383  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1384  * loop round, and hope for the best.
1385  *
1386  * This is all very unpleasant, but hopefully avoids the problems with the old
1387  * probe code (which had a 15-second delay if the card was idle, and didn't
1388  * work at all if it was in a weird state).
1389  */
1390
1391 static int __init elplus_setup(struct net_device *dev)
1392 {
1393         elp_device *adapter = netdev_priv(dev);
1394         int i, tries, tries1, okay;
1395         unsigned long timeout;
1396         unsigned long cookie = 0;
1397         int err = -ENODEV;
1398
1399         /*
1400          *  setup adapter structure
1401          */
1402
1403         dev->base_addr = elp_autodetect(dev);
1404         if (!dev->base_addr)
1405                 return -ENODEV;
1406
1407         adapter->send_pcb_semaphore = 0;
1408
1409         for (tries1 = 0; tries1 < 3; tries1++) {
1410                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1411                 /* First try to write just one byte, to see if the card is
1412                  * responding at all normally.
1413                  */
1414                 timeout = jiffies + 5*HZ/100;
1415                 okay = 0;
1416                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1417                 if ((inb_status(dev->base_addr) & HCRE)) {
1418                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1419                         timeout = jiffies + 5*HZ/100;
1420                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1421                         if (inb_status(dev->base_addr) & HCRE)
1422                                 okay = 1;
1423                 }
1424                 if (!okay) {
1425                         /* Nope, it's ignoring the command register.  This means that
1426                          * either it's still booting up, or it's died.
1427                          */
1428                         pr_err("%s: command register wouldn't drain, ", dev->name);
1429                         if ((inb_status(dev->base_addr) & 7) == 3) {
1430                                 /* If the adapter status is 3, it *could* still be booting.
1431                                  * Give it the benefit of the doubt for 10 seconds.
1432                                  */
1433                                 pr_cont("assuming 3c505 still starting\n");
1434                                 timeout = jiffies + 10*HZ;
1435                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1436                                 if (inb_status(dev->base_addr) & 7) {
1437                                         pr_err("%s: 3c505 failed to start\n", dev->name);
1438                                 } else {
1439                                         okay = 1;  /* It started */
1440                                 }
1441                         } else {
1442                                 /* Otherwise, it must just be in a strange
1443                                  * state.  We probably need to kick it.
1444                                  */
1445                                 pr_cont("3c505 is sulking\n");
1446                         }
1447                 }
1448                 for (tries = 0; tries < 5 && okay; tries++) {
1449
1450                         /*
1451                          * Try to set the Ethernet address, to make sure that the board
1452                          * is working.
1453                          */
1454                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1455                         adapter->tx_pcb.length = 0;
1456                         cookie = probe_irq_on();
1457                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1458                                 pr_err("%s: could not send first PCB\n", dev->name);
1459                                 probe_irq_off(cookie);
1460                                 continue;
1461                         }
1462                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1463                                 pr_err("%s: could not read first PCB\n", dev->name);
1464                                 probe_irq_off(cookie);
1465                                 continue;
1466                         }
1467                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1468                             (adapter->rx_pcb.length != 6)) {
1469                                 pr_err("%s: first PCB wrong (%d, %d)\n", dev->name,
1470                                         adapter->rx_pcb.command, adapter->rx_pcb.length);
1471                                 probe_irq_off(cookie);
1472                                 continue;
1473                         }
1474                         goto okay;
1475                 }
1476                 /* It's broken.  Do a hard reset to re-initialise the board,
1477                  * and try again.
1478                  */
1479                 pr_info("%s: resetting adapter\n", dev->name);
1480                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1481                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1482         }
1483         pr_err("%s: failed to initialise 3c505\n", dev->name);
1484         goto out;
1485
1486       okay:
1487         if (dev->irq) {         /* Is there a preset IRQ? */
1488                 int rpt = probe_irq_off(cookie);
1489                 if (dev->irq != rpt) {
1490                         pr_warning("%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1491                 }
1492                 /* if dev->irq == probe_irq_off(cookie), all is well */
1493         } else                 /* No preset IRQ; just use what we can detect */
1494                 dev->irq = probe_irq_off(cookie);
1495         switch (dev->irq) {    /* Legal, sane? */
1496         case 0:
1497                 pr_err("%s: IRQ probe failed: check 3c505 jumpers.\n",
1498                        dev->name);
1499                 goto out;
1500         case 1:
1501         case 6:
1502         case 8:
1503         case 13:
1504                 pr_err("%s: Impossible IRQ %d reported by probe_irq_off().\n",
1505                        dev->name, dev->irq);
1506                        goto out;
1507         }
1508         /*
1509          *  Now we have the IRQ number so we can disable the interrupts from
1510          *  the board until the board is opened.
1511          */
1512         outb_control(adapter->hcr_val & ~CMDE, dev);
1513
1514         /*
1515          * copy Ethernet address into structure
1516          */
1517         for (i = 0; i < 6; i++)
1518                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1519
1520         /* find a DMA channel */
1521         if (!dev->dma) {
1522                 if (dev->mem_start) {
1523                         dev->dma = dev->mem_start & 7;
1524                 }
1525                 else {
1526                         pr_warning("%s: warning, DMA channel not specified, using default\n", dev->name);
1527                         dev->dma = ELP_DMA;
1528                 }
1529         }
1530
1531         /*
1532          * print remainder of startup message
1533          */
1534         pr_info("%s: 3c505 at %#lx, irq %d, dma %d, addr %pM, ",
1535                 dev->name, dev->base_addr, dev->irq, dev->dma, dev->dev_addr);
1536         /*
1537          * read more information from the adapter
1538          */
1539
1540         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1541         adapter->tx_pcb.length = 0;
1542         if (!send_pcb(dev, &adapter->tx_pcb) ||
1543             !receive_pcb(dev, &adapter->rx_pcb) ||
1544             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1545             (adapter->rx_pcb.length != 10)) {
1546                 pr_cont("not responding to second PCB\n");
1547         }
1548         pr_cont("rev %d.%d, %dk\n", adapter->rx_pcb.data.info.major_vers,
1549                 adapter->rx_pcb.data.info.minor_vers, adapter->rx_pcb.data.info.RAM_sz);
1550
1551         /*
1552          * reconfigure the adapter memory to better suit our purposes
1553          */
1554         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1555         adapter->tx_pcb.length = 12;
1556         adapter->tx_pcb.data.memconf.cmd_q = 8;
1557         adapter->tx_pcb.data.memconf.rcv_q = 8;
1558         adapter->tx_pcb.data.memconf.mcast = 10;
1559         adapter->tx_pcb.data.memconf.frame = 10;
1560         adapter->tx_pcb.data.memconf.rcv_b = 10;
1561         adapter->tx_pcb.data.memconf.progs = 0;
1562         if (!send_pcb(dev, &adapter->tx_pcb) ||
1563             !receive_pcb(dev, &adapter->rx_pcb) ||
1564             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1565             (adapter->rx_pcb.length != 2)) {
1566                 pr_err("%s: could not configure adapter memory\n", dev->name);
1567         }
1568         if (adapter->rx_pcb.data.configure) {
1569                 pr_err("%s: adapter configuration failed\n", dev->name);
1570         }
1571
1572         dev->netdev_ops = &elp_netdev_ops;
1573         dev->watchdog_timeo = 10*HZ;
1574         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1575
1576         dev->mem_start = dev->mem_end = 0;
1577
1578         err = register_netdev(dev);
1579         if (err)
1580                 goto out;
1581
1582         return 0;
1583 out:
1584         release_region(dev->base_addr, ELP_IO_EXTENT);
1585         return err;
1586 }
1587
1588 #ifndef MODULE
1589 struct net_device * __init elplus_probe(int unit)
1590 {
1591         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1592         int err;
1593         if (!dev)
1594                 return ERR_PTR(-ENOMEM);
1595
1596         sprintf(dev->name, "eth%d", unit);
1597         netdev_boot_setup_check(dev);
1598
1599         err = elplus_setup(dev);
1600         if (err) {
1601                 free_netdev(dev);
1602                 return ERR_PTR(err);
1603         }
1604         return dev;
1605 }
1606
1607 #else
1608 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1609 static int io[ELP_MAX_CARDS];
1610 static int irq[ELP_MAX_CARDS];
1611 static int dma[ELP_MAX_CARDS];
1612 module_param_array(io, int, NULL, 0);
1613 module_param_array(irq, int, NULL, 0);
1614 module_param_array(dma, int, NULL, 0);
1615 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1616 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1617 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1618
1619 int __init init_module(void)
1620 {
1621         int this_dev, found = 0;
1622
1623         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1624                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1625                 if (!dev)
1626                         break;
1627
1628                 dev->irq = irq[this_dev];
1629                 dev->base_addr = io[this_dev];
1630                 if (dma[this_dev]) {
1631                         dev->dma = dma[this_dev];
1632                 } else {
1633                         dev->dma = ELP_DMA;
1634                         pr_warning("3c505.c: warning, using default DMA channel,\n");
1635                 }
1636                 if (io[this_dev] == 0) {
1637                         if (this_dev) {
1638                                 free_netdev(dev);
1639                                 break;
1640                         }
1641                         pr_notice("3c505.c: module autoprobe not recommended, give io=xx.\n");
1642                 }
1643                 if (elplus_setup(dev) != 0) {
1644                         pr_warning("3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1645                         free_netdev(dev);
1646                         break;
1647                 }
1648                 dev_3c505[this_dev] = dev;
1649                 found++;
1650         }
1651         if (!found)
1652                 return -ENODEV;
1653         return 0;
1654 }
1655
1656 void __exit cleanup_module(void)
1657 {
1658         int this_dev;
1659
1660         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1661                 struct net_device *dev = dev_3c505[this_dev];
1662                 if (dev) {
1663                         unregister_netdev(dev);
1664                         release_region(dev->base_addr, ELP_IO_EXTENT);
1665                         free_netdev(dev);
1666                 }
1667         }
1668 }
1669
1670 #endif                          /* MODULE */
1671 MODULE_LICENSE("GPL");