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3c505.c

/*
 * Linux Ethernet device driver for the 3Com Etherlink Plus (3C505)
 *      By Craig Southeren, Juha Laiho and Philip Blundell
 *
 * 3c505.c      This module implements an interface to the 3Com
 *              Etherlink Plus (3c505) Ethernet card. Linux device
 *              driver interface reverse engineered from the Linux 3C509
 *              device drivers. Some 3C505 information gleaned from
 *              the Crynwr packet driver. Still this driver would not
 *              be here without 3C505 technical reference provided by
 *              3Com.
 *
 * $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $
 *
 * Authors:     Linux 3c505 device driver by
 *                      Craig Southeren, <craigs@ineluki.apana.org.au>
 *              Final debugging by
 *                      Andrew Tridgell, <tridge@nimbus.anu.edu.au>
 *              Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
 *                      Juha Laiho, <jlaiho@ichaos.nullnet.fi>
 *              Linux 3C509 driver by
 *                      Donald Becker, <becker@super.org>
 *                (Now at <becker@scyld.com>)
 *              Crynwr packet driver by
 *                      Krishnan Gopalan and Gregg Stefancik,
 *                      Clemson University Engineering Computer Operations.
 *                      Portions of the code have been adapted from the 3c505
 *                         driver for NCSA Telnet by Bruce Orchard and later
 *                         modified by Warren Van Houten and krus@diku.dk.
 *              3C505 technical information provided by
 *                      Terry Murphy, of 3Com Network Adapter Division
 *              Linux 1.3.0 changes by
 *                      Alan Cox <Alan.Cox@linux.org>
 *              More debugging, DMA support, currently maintained by
 *                      Philip Blundell <philb@gnu.org>
 *              Multicard/soft configurable dma channel/rev 2 hardware support
 *                      by Christopher Collins <ccollins@pcug.org.au>
 *          Ethtool support (jgarzik), 11/17/2001
 */

#define DRV_NAME  "3c505"
#define DRV_VERSION     "1.10a"


/* Theory of operation:
 *
 * The 3c505 is quite an intelligent board.  All communication with it is done
 * by means of Primary Command Blocks (PCBs); these are transferred using PIO
 * through the command register.  The card has 256k of on-board RAM, which is
 * used to buffer received packets.  It might seem at first that more buffers
 * are better, but in fact this isn't true.  From my tests, it seems that
 * more than about 10 buffers are unnecessary, and there is a noticeable
 * performance hit in having more active on the card.  So the majority of the
 * card's memory isn't, in fact, used.  Sadly, the card only has one transmit
 * buffer and, short of loading our own firmware into it (which is what some
 * drivers resort to) there's nothing we can do about this.
 *
 * We keep up to 4 "receive packet" commands active on the board at a time.
 * When a packet comes in, so long as there is a receive command active, the
 * board will send us a "packet received" PCB and then add the data for that
 * packet to the DMA queue.  If a DMA transfer is not already in progress, we
 * set one up to start uploading the data.  We have to maintain a list of
 * backlogged receive packets, because the card may decide to tell us about
 * a newly-arrived packet at any time, and we may not be able to start a DMA
 * transfer immediately (ie one may already be going on).  We can't NAK the
 * PCB, because then it would throw the packet away.
 *
 * Trying to send a PCB to the card at the wrong moment seems to have bad
 * effects.  If we send it a transmit PCB while a receive DMA is happening,
 * it will just NAK the PCB and so we will have wasted our time.  Worse, it
 * sometimes seems to interrupt the transfer.  The majority of the low-level
 * code is protected by one huge semaphore -- "busy" -- which is set whenever
 * it probably isn't safe to do anything to the card.  The receive routine
 * must gain a lock on "busy" before it can start a DMA transfer, and the
 * transmit routine must gain a lock before it sends the first PCB to the card.
 * The send_pcb() routine also has an internal semaphore to protect it against
 * being re-entered (which would be disastrous) -- this is needed because
 * several things can happen asynchronously (re-priming the receiver and
 * asking the card for statistics, for example).  send_pcb() will also refuse
 * to talk to the card at all if a DMA upload is happening.  The higher-level
 * networking code will reschedule a later retry if some part of the driver
 * is blocked.  In practice, this doesn't seem to happen very often.
 */

/* This driver may now work with revision 2.x hardware, since all the read
 * operations on the HCR have been removed (we now keep our own softcopy).
 * But I don't have an old card to test it on.
 *
 * This has had the bad effect that the autoprobe routine is now a bit
 * less friendly to other devices.  However, it was never very good.
 * before, so I doubt it will hurt anybody.
 */

/* The driver is a mess.  I took Craig's and Juha's code, and hacked it firstly
 * to make it more reliable, and secondly to add DMA mode.  Many things could
 * probably be done better; the concurrency protection is particularly awful.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/bitops.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>

#include "3c505.h"

/*********************************************************
 *
 *  define debug messages here as common strings to reduce space
 *
 *********************************************************/

static const char filename[] = __FILE__;

static const char timeout_msg[] = "*** timeout at %s:%s (line %d) ***\n";
#define TIMEOUT_MSG(lineno) \
      printk(timeout_msg, filename,__FUNCTION__,(lineno))

static const char invalid_pcb_msg[] =
"*** invalid pcb length %d at %s:%s (line %d) ***\n";
#define INVALID_PCB_MSG(len) \
      printk(invalid_pcb_msg, (len),filename,__FUNCTION__,__LINE__)

static char search_msg[] __initdata = KERN_INFO "%s: Looking for 3c505 adapter at address %#x...";

static char stilllooking_msg[] __initdata = "still looking...";

static char found_msg[] __initdata = "found.\n";

static char notfound_msg[] __initdata = "not found (reason = %d)\n";

static char couldnot_msg[] __initdata = KERN_INFO "%s: 3c505 not found\n";

/*********************************************************
 *
 *  various other debug stuff
 *
 *********************************************************/

#ifdef ELP_DEBUG
static int elp_debug = ELP_DEBUG;
#else
static int elp_debug;
#endif
#define debug elp_debug

/*
 *  0 = no messages (well, some)
 *  1 = messages when high level commands performed
 *  2 = messages when low level commands performed
 *  3 = messages when interrupts received
 */

/*****************************************************************
 *
 * List of I/O-addresses we try to auto-sense
 * Last element MUST BE 0!
 *****************************************************************/

static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};

/* Dma Memory related stuff */

static unsigned long dma_mem_alloc(int size)
{
      int order = get_order(size);
      return __get_dma_pages(GFP_KERNEL, order);
}


/*****************************************************************
 *
 * Functions for I/O (note the inline !)
 *
 *****************************************************************/

static inline unsigned char inb_status(unsigned int base_addr)
{
      return inb(base_addr + PORT_STATUS);
}

static inline int inb_command(unsigned int base_addr)
{
      return inb(base_addr + PORT_COMMAND);
}

static inline void outb_control(unsigned char val, struct net_device *dev)
{
      outb(val, dev->base_addr + PORT_CONTROL);
      ((elp_device *)(dev->priv))->hcr_val = val;
}

#define HCR_VAL(x)   (((elp_device *)((x)->priv))->hcr_val)

static inline void outb_command(unsigned char val, unsigned int base_addr)
{
      outb(val, base_addr + PORT_COMMAND);
}

static inline unsigned int backlog_next(unsigned int n)
{
      return (n + 1) % BACKLOG_SIZE;
}

/*****************************************************************
 *
 *  useful functions for accessing the adapter
 *
 *****************************************************************/

/*
 * use this routine when accessing the ASF bits as they are
 * changed asynchronously by the adapter
 */

/* get adapter PCB status */
#define     GET_ASF(addr) \
      (get_status(addr)&ASF_PCB_MASK)

static inline int get_status(unsigned int base_addr)
{
      unsigned long timeout = jiffies + 10*HZ/100;
      register int stat1;
      do {
            stat1 = inb_status(base_addr);
      } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
      if (time_after_eq(jiffies, timeout))
            TIMEOUT_MSG(__LINE__);
      return stat1;
}

static inline void set_hsf(struct net_device *dev, int hsf)
{
      elp_device *adapter = dev->priv;
      unsigned long flags;

      spin_lock_irqsave(&adapter->lock, flags);
      outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
      spin_unlock_irqrestore(&adapter->lock, flags);
}

static bool start_receive(struct net_device *, pcb_struct *);

static inline void adapter_reset(struct net_device *dev)
{
      unsigned long timeout;
      elp_device *adapter = dev->priv;
      unsigned char orig_hcr = adapter->hcr_val;

      outb_control(0, dev);

      if (inb_status(dev->base_addr) & ACRF) {
            do {
                  inb_command(dev->base_addr);
                  timeout = jiffies + 2*HZ/100;
                  while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
            } while (inb_status(dev->base_addr) & ACRF);
            set_hsf(dev, HSF_PCB_NAK);
      }
      outb_control(adapter->hcr_val | ATTN | DIR, dev);
      mdelay(10);
      outb_control(adapter->hcr_val & ~ATTN, dev);
      mdelay(10);
      outb_control(adapter->hcr_val | FLSH, dev);
      mdelay(10);
      outb_control(adapter->hcr_val & ~FLSH, dev);
      mdelay(10);

      outb_control(orig_hcr, dev);
      if (!start_receive(dev, &adapter->tx_pcb))
            printk(KERN_ERR "%s: start receive command failed \n", dev->name);
}

/* Check to make sure that a DMA transfer hasn't timed out.  This should
 * never happen in theory, but seems to occur occasionally if the card gets
 * prodded at the wrong time.
 */
static inline void check_3c505_dma(struct net_device *dev)
{
      elp_device *adapter = dev->priv;
      if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
            unsigned long flags, f;
            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));
            spin_lock_irqsave(&adapter->lock, flags);
            adapter->dmaing = 0;
            adapter->busy = 0;

            f=claim_dma_lock();
            disable_dma(dev->dma);
            release_dma_lock(f);

            if (adapter->rx_active)
                  adapter->rx_active--;
            outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
            spin_unlock_irqrestore(&adapter->lock, flags);
      }
}

/* Primitive functions used by send_pcb() */
static inline bool send_pcb_slow(unsigned int base_addr, unsigned char byte)
{
      unsigned long timeout;
      outb_command(byte, base_addr);
      for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
            if (inb_status(base_addr) & HCRE)
                  return false;
      }
      printk(KERN_WARNING "3c505: send_pcb_slow timed out\n");
      return true;
}

static inline bool send_pcb_fast(unsigned int base_addr, unsigned char byte)
{
      unsigned int timeout;
      outb_command(byte, base_addr);
      for (timeout = 0; timeout < 40000; timeout++) {
            if (inb_status(base_addr) & HCRE)
                  return false;
      }
      printk(KERN_WARNING "3c505: send_pcb_fast timed out\n");
      return true;
}

/* Check to see if the receiver needs restarting, and kick it if so */
static inline void prime_rx(struct net_device *dev)
{
      elp_device *adapter = dev->priv;
      while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
            if (!start_receive(dev, &adapter->itx_pcb))
                  break;
      }
}

/*****************************************************************
 *
 * send_pcb
 *   Send a PCB to the adapter.
 *
 *    output byte to command reg  --<--+
 *    wait until HCRE is non zero      |
 *    loop until all bytes sent   -->--+
 *    set HSF1 and HSF2 to 1
 *    output pcb length
 *    wait until ASF give ACK or NAK
 *    set HSF1 and HSF2 to 0
 *
 *****************************************************************/

/* This can be quite slow -- the adapter is allowed to take up to 40ms
 * to respond to the initial interrupt.
 *
 * We run initially with interrupts turned on, but with a semaphore set
 * so that nobody tries to re-enter this code.  Once the first byte has
 * gone through, we turn interrupts off and then send the others (the
 * timeout is reduced to 500us).
 */

static bool send_pcb(struct net_device *dev, pcb_struct * pcb)
{
      int i;
      unsigned long timeout;
      elp_device *adapter = dev->priv;
      unsigned long flags;

      check_3c505_dma(dev);

      if (adapter->dmaing && adapter->current_dma.direction == 0)
            return false;

      /* Avoid contention */
      if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
            if (elp_debug >= 3) {
                  printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name);
            }
            return false;
      }
      /*
       * load each byte into the command register and
       * wait for the HCRE bit to indicate the adapter
       * had read the byte
       */
      set_hsf(dev, 0);

      if (send_pcb_slow(dev->base_addr, pcb->command))
            goto abort;

      spin_lock_irqsave(&adapter->lock, flags);

      if (send_pcb_fast(dev->base_addr, pcb->length))
            goto sti_abort;

      for (i = 0; i < pcb->length; i++) {
            if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
                  goto sti_abort;
      }

      outb_control(adapter->hcr_val | 3, dev);  /* signal end of PCB */
      outb_command(2 + pcb->length, dev->base_addr);

      /* now wait for the acknowledgement */
      spin_unlock_irqrestore(&adapter->lock, flags);

      for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
            switch (GET_ASF(dev->base_addr)) {
            case ASF_PCB_ACK:
                  adapter->send_pcb_semaphore = 0;
                  return true;

            case ASF_PCB_NAK:
#ifdef ELP_DEBUG
                  printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name);
#endif
                  goto abort;
            }
      }

      if (elp_debug >= 1)
            printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
      goto abort;

      sti_abort:
      spin_unlock_irqrestore(&adapter->lock, flags);
      abort:
      adapter->send_pcb_semaphore = 0;
      return false;
}


/*****************************************************************
 *
 * receive_pcb
 *   Read a PCB from the adapter
 *
 *    wait for ACRF to be non-zero        ---<---+
 *    input a byte                               |
 *    if ASF1 and ASF2 were not both one         |
 *          before byte was read, loop      --->---+
 *    set HSF1 and HSF2 for ack
 *
 *****************************************************************/

static bool receive_pcb(struct net_device *dev, pcb_struct * pcb)
{
      int i, j;
      int total_length;
      int stat;
      unsigned long timeout;
      unsigned long flags;

      elp_device *adapter = dev->priv;

      set_hsf(dev, 0);

      /* get the command code */
      timeout = jiffies + 2*HZ/100;
      while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
      if (time_after_eq(jiffies, timeout)) {
            TIMEOUT_MSG(__LINE__);
            return false;
      }
      pcb->command = inb_command(dev->base_addr);

      /* read the data length */
      timeout = jiffies + 3*HZ/100;
      while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
      if (time_after_eq(jiffies, timeout)) {
            TIMEOUT_MSG(__LINE__);
            printk(KERN_INFO "%s: status %02x\n", dev->name, stat);
            return false;
      }
      pcb->length = inb_command(dev->base_addr);

      if (pcb->length > MAX_PCB_DATA) {
            INVALID_PCB_MSG(pcb->length);
            adapter_reset(dev);
            return false;
      }
      /* read the data */
      spin_lock_irqsave(&adapter->lock, flags);
      i = 0;
      do {
            j = 0;
            while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
            pcb->data.raw[i++] = inb_command(dev->base_addr);
            if (i > MAX_PCB_DATA)
                  INVALID_PCB_MSG(i);
      } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
      spin_unlock_irqrestore(&adapter->lock, flags);
      if (j >= 20000) {
            TIMEOUT_MSG(__LINE__);
            return false;
      }
      /* woops, the last "data" byte was really the length! */
      total_length = pcb->data.raw[--i];

      /* safety check total length vs data length */
      if (total_length != (pcb->length + 2)) {
            if (elp_debug >= 2)
                  printk(KERN_WARNING "%s: mangled PCB received\n", dev->name);
            set_hsf(dev, HSF_PCB_NAK);
            return false;
      }

      if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
            if (test_and_set_bit(0, (void *) &adapter->busy)) {
                  if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
                        set_hsf(dev, HSF_PCB_NAK);
                        printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
                        pcb->command = 0;
                        return true;
                  } else {
                        pcb->command = 0xff;
                  }
            }
      }
      set_hsf(dev, HSF_PCB_ACK);
      return true;
}

/******************************************************
 *
 *  queue a receive command on the adapter so we will get an
 *  interrupt when a packet is received.
 *
 ******************************************************/

static bool start_receive(struct net_device *dev, pcb_struct * tx_pcb)
{
      bool status;
      elp_device *adapter = dev->priv;

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: restarting receiver\n", dev->name);
      tx_pcb->command = CMD_RECEIVE_PACKET;
      tx_pcb->length = sizeof(struct Rcv_pkt);
      tx_pcb->data.rcv_pkt.buf_seg
          = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
      tx_pcb->data.rcv_pkt.buf_len = 1600;
      tx_pcb->data.rcv_pkt.timeout = 0;   /* set timeout to zero */
      status = send_pcb(dev, tx_pcb);
      if (status)
            adapter->rx_active++;
      return status;
}

/******************************************************
 *
 * extract a packet from the adapter
 * this routine is only called from within the interrupt
 * service routine, so no cli/sti calls are needed
 * note that the length is always assumed to be even
 *
 ******************************************************/

static void receive_packet(struct net_device *dev, int len)
{
      int rlen;
      elp_device *adapter = dev->priv;
      void *target;
      struct sk_buff *skb;
      unsigned long flags;

      rlen = (len + 1) & ~1;
      skb = dev_alloc_skb(rlen + 2);

      if (!skb) {
            printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
            target = adapter->dma_buffer;
            adapter->current_dma.target = NULL;
            /* FIXME: stats */
            return;
      }

      skb_reserve(skb, 2);
      target = skb_put(skb, rlen);
      if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
            adapter->current_dma.target = target;
            target = adapter->dma_buffer;
      } else {
            adapter->current_dma.target = NULL;
      }

      /* if this happens, we die */
      if (test_and_set_bit(0, (void *) &adapter->dmaing))
            printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);

      adapter->current_dma.direction = 0;
      adapter->current_dma.length = rlen;
      adapter->current_dma.skb = skb;
      adapter->current_dma.start_time = jiffies;

      outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);

      flags=claim_dma_lock();
      disable_dma(dev->dma);
      clear_dma_ff(dev->dma);
      set_dma_mode(dev->dma, 0x04); /* dma read */
      set_dma_addr(dev->dma, isa_virt_to_bus(target));
      set_dma_count(dev->dma, rlen);
      enable_dma(dev->dma);
      release_dma_lock(flags);

      if (elp_debug >= 3) {
            printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
      }

      if (adapter->rx_active)
            adapter->rx_active--;

      if (!adapter->busy)
            printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
}

/******************************************************
 *
 * interrupt handler
 *
 ******************************************************/

static irqreturn_t elp_interrupt(int irq, void *dev_id)
{
      int len;
      int dlen;
      int icount = 0;
      struct net_device *dev;
      elp_device *adapter;
      unsigned long timeout;

      dev = dev_id;
      adapter = (elp_device *) dev->priv;

      spin_lock(&adapter->lock);

      do {
            /*
             * has a DMA transfer finished?
             */
            if (inb_status(dev->base_addr) & DONE) {
                  if (!adapter->dmaing) {
                        printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
                  }
                  if (elp_debug >= 3) {
                        printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
                  }

                  outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
                  if (adapter->current_dma.direction) {
                        dev_kfree_skb_irq(adapter->current_dma.skb);
                  } else {
                        struct sk_buff *skb = adapter->current_dma.skb;
                        if (skb) {
                              if (adapter->current_dma.target) {
                              /* have already done the skb_put() */
                              memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
                              }
                              skb->protocol = eth_type_trans(skb,dev);
                              adapter->stats.rx_bytes += skb->len;
                              netif_rx(skb);
                              dev->last_rx = jiffies;
                        }
                  }
                  adapter->dmaing = 0;
                  if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
                        int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
                        adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
                        if (elp_debug >= 2)
                              printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
                        receive_packet(dev, t);
                  } else {
                        adapter->busy = 0;
                  }
            } else {
                  /* has one timed out? */
                  check_3c505_dma(dev);
            }

            /*
             * receive a PCB from the adapter
             */
            timeout = jiffies + 3*HZ/100;
            while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
                  if (receive_pcb(dev, &adapter->irx_pcb)) {
                        switch (adapter->irx_pcb.command)
                        {
                        case 0:
                              break;
                              /*
                               * received a packet - this must be handled fast
                               */
                        case 0xff:
                        case CMD_RECEIVE_PACKET_COMPLETE:
                              /* if the device isn't open, don't pass packets up the stack */
                              if (!netif_running(dev))
                                    break;
                              len = adapter->irx_pcb.data.rcv_resp.pkt_len;
                              dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
                              if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
                                    printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
                              } else {
                                    if (elp_debug >= 3) {
                                          printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
                                    }
                                    if (adapter->irx_pcb.command == 0xff) {
                                          if (elp_debug >= 2)
                                                printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
                                          adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
                                          adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
                                    } else {
                                          receive_packet(dev, dlen);
                                    }
                                    if (elp_debug >= 3)
                                          printk(KERN_DEBUG "%s: packet received\n", dev->name);
                              }
                              break;

                              /*
                               * 82586 configured correctly
                               */
                        case CMD_CONFIGURE_82586_RESPONSE:
                              adapter->got[CMD_CONFIGURE_82586] = 1;
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
                              break;

                              /*
                               * Adapter memory configuration
                               */
                        case CMD_CONFIGURE_ADAPTER_RESPONSE:
                              adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
                                           adapter->irx_pcb.data.failed ? "failed" : "succeeded");
                              break;

                              /*
                               * Multicast list loading
                               */
                        case CMD_LOAD_MULTICAST_RESPONSE:
                              adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
                                           adapter->irx_pcb.data.failed ? "failed" : "succeeded");
                              break;

                              /*
                               * Station address setting
                               */
                        case CMD_SET_ADDRESS_RESPONSE:
                              adapter->got[CMD_SET_STATION_ADDRESS] = 1;
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
                                           adapter->irx_pcb.data.failed ? "failed" : "succeeded");
                              break;


                              /*
                               * received board statistics
                               */
                        case CMD_NETWORK_STATISTICS_RESPONSE:
                              adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
                              adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
                              adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
                              adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
                              adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
                              adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
                              adapter->got[CMD_NETWORK_STATISTICS] = 1;
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
                              break;

                              /*
                               * sent a packet
                               */
                        case CMD_TRANSMIT_PACKET_COMPLETE:
                              if (elp_debug >= 3)
                                    printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
                              if (!netif_running(dev))
                                    break;
                              switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
                              case 0xffff:
                                    adapter->stats.tx_aborted_errors++;
                                    printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
                                    break;
                              case 0xfffe:
                                    adapter->stats.tx_fifo_errors++;
                                    printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
                                    break;
                              }
                              netif_wake_queue(dev);
                              break;

                              /*
                               * some unknown PCB
                               */
                        default:
                              printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
                              break;
                        }
                  } else {
                        printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
                        adapter_reset(dev);
                  }
            }

      } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));

      prime_rx(dev);

      /*
       * indicate no longer in interrupt routine
       */
      spin_unlock(&adapter->lock);
      return IRQ_HANDLED;
}


/******************************************************
 *
 * open the board
 *
 ******************************************************/

static int elp_open(struct net_device *dev)
{
      elp_device *adapter;
      int retval;

      adapter = dev->priv;

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: request to open device\n", dev->name);

      /*
       * make sure we actually found the device
       */
      if (adapter == NULL) {
            printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
            return -EAGAIN;
      }
      /*
       * disable interrupts on the board
       */
      outb_control(0, dev);

      /*
       * clear any pending interrupts
       */
      inb_command(dev->base_addr);
      adapter_reset(dev);

      /*
       * no receive PCBs active
       */
      adapter->rx_active = 0;

      adapter->busy = 0;
      adapter->send_pcb_semaphore = 0;
      adapter->rx_backlog.in = 0;
      adapter->rx_backlog.out = 0;

      spin_lock_init(&adapter->lock);

      /*
       * install our interrupt service routine
       */
      if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
            printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
            return retval;
      }
      if ((retval = request_dma(dev->dma, dev->name))) {
            free_irq(dev->irq, dev);
            printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
            return retval;
      }
      adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
      if (!adapter->dma_buffer) {
            printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
            free_dma(dev->dma);
            free_irq(dev->irq, dev);
            return -ENOMEM;
      }
      adapter->dmaing = 0;

      /*
       * enable interrupts on the board
       */
      outb_control(CMDE, dev);

      /*
       * configure adapter memory: we need 10 multicast addresses, default==0
       */
      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
      adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
      adapter->tx_pcb.data.memconf.cmd_q = 10;
      adapter->tx_pcb.data.memconf.rcv_q = 20;
      adapter->tx_pcb.data.memconf.mcast = 10;
      adapter->tx_pcb.data.memconf.frame = 20;
      adapter->tx_pcb.data.memconf.rcv_b = 20;
      adapter->tx_pcb.data.memconf.progs = 0;
      adapter->tx_pcb.length = sizeof(struct Memconf);
      adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
      if (!send_pcb(dev, &adapter->tx_pcb))
            printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
      else {
            unsigned long timeout = jiffies + TIMEOUT;
            while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
            if (time_after_eq(jiffies, timeout))
                  TIMEOUT_MSG(__LINE__);
      }


      /*
       * configure adapter to receive broadcast messages and wait for response
       */
      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
      adapter->tx_pcb.command = CMD_CONFIGURE_82586;
      adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
      adapter->tx_pcb.length = 2;
      adapter->got[CMD_CONFIGURE_82586] = 0;
      if (!send_pcb(dev, &adapter->tx_pcb))
            printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
      else {
            unsigned long timeout = jiffies + TIMEOUT;
            while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
            if (time_after_eq(jiffies, timeout))
                  TIMEOUT_MSG(__LINE__);
      }

      /* enable burst-mode DMA */
      /* outb(0x1, dev->base_addr + PORT_AUXDMA); */

      /*
       * queue receive commands to provide buffering
       */
      prime_rx(dev);
      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);

      /*
       * device is now officially open!
       */

      netif_start_queue(dev);
      return 0;
}


/******************************************************
 *
 * send a packet to the adapter
 *
 ******************************************************/

static bool send_packet(struct net_device *dev, struct sk_buff *skb)
{
      elp_device *adapter = dev->priv;
      unsigned long target;
      unsigned long flags;

      /*
       * make sure the length is even and no shorter than 60 bytes
       */
      unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);

      if (test_and_set_bit(0, (void *) &adapter->busy)) {
            if (elp_debug >= 2)
                  printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
            return false;
      }

      adapter->stats.tx_bytes += nlen;

      /*
       * send the adapter a transmit packet command. Ignore segment and offset
       * and make sure the length is even
       */
      adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
      adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
      adapter->tx_pcb.data.xmit_pkt.buf_ofs
          = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;      /* Unused */
      adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;

      if (!send_pcb(dev, &adapter->tx_pcb)) {
            adapter->busy = 0;
            return false;
      }
      /* if this happens, we die */
      if (test_and_set_bit(0, (void *) &adapter->dmaing))
            printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);

      adapter->current_dma.direction = 1;
      adapter->current_dma.start_time = jiffies;

      if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
            skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
            memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
            target = isa_virt_to_bus(adapter->dma_buffer);
      }
      else {
            target = isa_virt_to_bus(skb->data);
      }
      adapter->current_dma.skb = skb;

      flags=claim_dma_lock();
      disable_dma(dev->dma);
      clear_dma_ff(dev->dma);
      set_dma_mode(dev->dma, 0x48); /* dma memory -> io */
      set_dma_addr(dev->dma, target);
      set_dma_count(dev->dma, nlen);
      outb_control(adapter->hcr_val | DMAE | TCEN, dev);
      enable_dma(dev->dma);
      release_dma_lock(flags);

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);

      return true;
}

/*
 *    The upper layer thinks we timed out
 */

static void elp_timeout(struct net_device *dev)
{
      elp_device *adapter = dev->priv;
      int stat;

      stat = inb_status(dev->base_addr);
      printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
      if (elp_debug >= 1)
            printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
      dev->trans_start = jiffies;
      adapter->stats.tx_dropped++;
      netif_wake_queue(dev);
}

/******************************************************
 *
 * start the transmitter
 *    return 0 if sent OK, else return 1
 *
 ******************************************************/

static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      unsigned long flags;
      elp_device *adapter = dev->priv;

      spin_lock_irqsave(&adapter->lock, flags);
      check_3c505_dma(dev);

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);

      netif_stop_queue(dev);

      /*
       * send the packet at skb->data for skb->len
       */
      if (!send_packet(dev, skb)) {
            if (elp_debug >= 2) {
                  printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
            }
            spin_unlock_irqrestore(&adapter->lock, flags);
            return 1;
      }
      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);

      /*
       * start the transmit timeout
       */
      dev->trans_start = jiffies;

      prime_rx(dev);
      spin_unlock_irqrestore(&adapter->lock, flags);
      netif_start_queue(dev);
      return 0;
}

/******************************************************
 *
 * return statistics on the board
 *
 ******************************************************/

static struct net_device_stats *elp_get_stats(struct net_device *dev)
{
      elp_device *adapter = (elp_device *) dev->priv;

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: request for stats\n", dev->name);

      /* If the device is closed, just return the latest stats we have,
         - we cannot ask from the adapter without interrupts */
      if (!netif_running(dev))
            return &adapter->stats;

      /* send a get statistics command to the board */
      adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
      adapter->tx_pcb.length = 0;
      adapter->got[CMD_NETWORK_STATISTICS] = 0;
      if (!send_pcb(dev, &adapter->tx_pcb))
            printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
      else {
            unsigned long timeout = jiffies + TIMEOUT;
            while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
            if (time_after_eq(jiffies, timeout)) {
                  TIMEOUT_MSG(__LINE__);
                  return &adapter->stats;
            }
      }

      /* statistics are now up to date */
      return &adapter->stats;
}


static void netdev_get_drvinfo(struct net_device *dev,
                         struct ethtool_drvinfo *info)
{
      strcpy(info->driver, DRV_NAME);
      strcpy(info->version, DRV_VERSION);
      sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
}

static u32 netdev_get_msglevel(struct net_device *dev)
{
      return debug;
}

static void netdev_set_msglevel(struct net_device *dev, u32 level)
{
      debug = level;
}

static const struct ethtool_ops netdev_ethtool_ops = {
      .get_drvinfo            = netdev_get_drvinfo,
      .get_msglevel           = netdev_get_msglevel,
      .set_msglevel           = netdev_set_msglevel,
};

/******************************************************
 *
 * close the board
 *
 ******************************************************/

static int elp_close(struct net_device *dev)
{
      elp_device *adapter;

      adapter = dev->priv;

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: request to close device\n", dev->name);

      netif_stop_queue(dev);

      /* Someone may request the device statistic information even when
       * the interface is closed. The following will update the statistics
       * structure in the driver, so we'll be able to give current statistics.
       */
      (void) elp_get_stats(dev);

      /*
       * disable interrupts on the board
       */
      outb_control(0, dev);

      /*
       * release the IRQ
       */
      free_irq(dev->irq, dev);

      free_dma(dev->dma);
      free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));

      return 0;
}


/************************************************************
 *
 * Set multicast list
 * num_addrs==0: clear mc_list
 * num_addrs==-1: set promiscuous mode
 * num_addrs>0: set mc_list
 *
 ************************************************************/

static void elp_set_mc_list(struct net_device *dev)
{
      elp_device *adapter = (elp_device *) dev->priv;
      struct dev_mc_list *dmi = dev->mc_list;
      int i;
      unsigned long flags;

      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);

      spin_lock_irqsave(&adapter->lock, flags);

      if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
            /* send a "load multicast list" command to the board, max 10 addrs/cmd */
            /* if num_addrs==0 the list will be cleared */
            adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
            adapter->tx_pcb.length = 6 * dev->mc_count;
            for (i = 0; i < dev->mc_count; i++) {
                  memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
                  dmi = dmi->next;
            }
            adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
            if (!send_pcb(dev, &adapter->tx_pcb))
                  printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
            else {
                  unsigned long timeout = jiffies + TIMEOUT;
                  while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
                  if (time_after_eq(jiffies, timeout)) {
                        TIMEOUT_MSG(__LINE__);
                  }
            }
            if (dev->mc_count)
                  adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
            else        /* num_addrs == 0 */
                  adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
      } else
            adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
      /*
       * configure adapter to receive messages (as specified above)
       * and wait for response
       */
      if (elp_debug >= 3)
            printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
      adapter->tx_pcb.command = CMD_CONFIGURE_82586;
      adapter->tx_pcb.length = 2;
      adapter->got[CMD_CONFIGURE_82586] = 0;
      if (!send_pcb(dev, &adapter->tx_pcb))
      {
            spin_unlock_irqrestore(&adapter->lock, flags);
            printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
      }
      else {
            unsigned long timeout = jiffies + TIMEOUT;
            spin_unlock_irqrestore(&adapter->lock, flags);
            while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
            if (time_after_eq(jiffies, timeout))
                  TIMEOUT_MSG(__LINE__);
      }
}

/************************************************************
 *
 * A couple of tests to see if there's 3C505 or not
 * Called only by elp_autodetect
 ************************************************************/

static int __init elp_sense(struct net_device *dev)
{
      int addr = dev->base_addr;
      const char *name = dev->name;
      byte orig_HSR;

      if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
            return -ENODEV;

      orig_HSR = inb_status(addr);

      if (elp_debug > 0)
            printk(search_msg, name, addr);

      if (orig_HSR == 0xff) {
            if (elp_debug > 0)
                  printk(notfound_msg, 1);
            goto out;
      }

      /* Wait for a while; the adapter may still be booting up */
      if (elp_debug > 0)
            printk(stilllooking_msg);

      if (orig_HSR & DIR) {
            /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
            outb(0, dev->base_addr + PORT_CONTROL);
            msleep(300);
            if (inb_status(addr) & DIR) {
                  if (elp_debug > 0)
                        printk(notfound_msg, 2);
                  goto out;
            }
      } else {
            /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
            outb(DIR, dev->base_addr + PORT_CONTROL);
            msleep(300);
            if (!(inb_status(addr) & DIR)) {
                  if (elp_debug > 0)
                        printk(notfound_msg, 3);
                  goto out;
            }
      }
      /*
       * It certainly looks like a 3c505.
       */
      if (elp_debug > 0)
            printk(found_msg);

      return 0;
out:
      release_region(addr, ELP_IO_EXTENT);
      return -ENODEV;
}

/*************************************************************
 *
 * Search through addr_list[] and try to find a 3C505
 * Called only by eplus_probe
 *************************************************************/

static int __init elp_autodetect(struct net_device *dev)
{
      int idx = 0;

      /* if base address set, then only check that address
         otherwise, run through the table */
      if (dev->base_addr != 0) {    /* dev->base_addr == 0 ==> plain autodetect */
            if (elp_sense(dev) == 0)
                  return dev->base_addr;
      } else
            while ((dev->base_addr = addr_list[idx++])) {
                  if (elp_sense(dev) == 0)
                        return dev->base_addr;
            }

      /* could not find an adapter */
      if (elp_debug > 0)
            printk(couldnot_msg, dev->name);

      return 0;         /* Because of this, the layer above will return -ENODEV */
}


/******************************************************
 *
 * probe for an Etherlink Plus board at the specified address
 *
 ******************************************************/

/* There are three situations we need to be able to detect here:

 *  a) the card is idle
 *  b) the card is still booting up
 *  c) the card is stuck in a strange state (some DOS drivers do this)
 *
 * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
 * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
 * loop round, and hope for the best.
 *
 * This is all very unpleasant, but hopefully avoids the problems with the old
 * probe code (which had a 15-second delay if the card was idle, and didn't
 * work at all if it was in a weird state).
 */

static int __init elplus_setup(struct net_device *dev)
{
      elp_device *adapter = dev->priv;
      int i, tries, tries1, okay;
      unsigned long timeout;
      unsigned long cookie = 0;
      int err = -ENODEV;
      DECLARE_MAC_BUF(mac);

      /*
       *  setup adapter structure
       */

      dev->base_addr = elp_autodetect(dev);
      if (!dev->base_addr)
            return -ENODEV;

      adapter->send_pcb_semaphore = 0;

      for (tries1 = 0; tries1 < 3; tries1++) {
            outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
            /* First try to write just one byte, to see if the card is
             * responding at all normally.
             */
            timeout = jiffies + 5*HZ/100;
            okay = 0;
            while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
            if ((inb_status(dev->base_addr) & HCRE)) {
                  outb_command(0, dev->base_addr);    /* send a spurious byte */
                  timeout = jiffies + 5*HZ/100;
                  while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
                  if (inb_status(dev->base_addr) & HCRE)
                        okay = 1;
            }
            if (!okay) {
                  /* Nope, it's ignoring the command register.  This means that
                   * either it's still booting up, or it's died.
                   */
                  printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
                  if ((inb_status(dev->base_addr) & 7) == 3) {
                        /* If the adapter status is 3, it *could* still be booting.
                         * Give it the benefit of the doubt for 10 seconds.
                         */
                        printk("assuming 3c505 still starting\n");
                        timeout = jiffies + 10*HZ;
                        while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
                        if (inb_status(dev->base_addr) & 7) {
                              printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
                        } else {
                              okay = 1;  /* It started */
                        }
                  } else {
                        /* Otherwise, it must just be in a strange
                         * state.  We probably need to kick it.
                         */
                        printk("3c505 is sulking\n");
                  }
            }
            for (tries = 0; tries < 5 && okay; tries++) {

                  /*
                   * Try to set the Ethernet address, to make sure that the board
                   * is working.
                   */
                  adapter->tx_pcb.command = CMD_STATION_ADDRESS;
                  adapter->tx_pcb.length = 0;
                  cookie = probe_irq_on();
                  if (!send_pcb(dev, &adapter->tx_pcb)) {
                        printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
                        probe_irq_off(cookie);
                        continue;
                  }
                  if (!receive_pcb(dev, &adapter->rx_pcb)) {
                        printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
                        probe_irq_off(cookie);
                        continue;
                  }
                  if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
                      (adapter->rx_pcb.length != 6)) {
                        printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
                        probe_irq_off(cookie);
                        continue;
                  }
                  goto okay;
            }
            /* It's broken.  Do a hard reset to re-initialise the board,
             * and try again.
             */
            printk(KERN_INFO "%s: resetting adapter\n", dev->name);
            outb_control(adapter->hcr_val | FLSH | ATTN, dev);
            outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
      }
      printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
      goto out;

      okay:
      if (dev->irq) {         /* Is there a preset IRQ? */
            int rpt = probe_irq_off(cookie);
            if (dev->irq != rpt) {
                  printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
            }
            /* if dev->irq == probe_irq_off(cookie), all is well */
      } else                   /* No preset IRQ; just use what we can detect */
            dev->irq = probe_irq_off(cookie);
      switch (dev->irq) {    /* Legal, sane? */
      case 0:
            printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
                   dev->name);
            goto out;
      case 1:
      case 6:
      case 8:
      case 13:
            printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
                   dev->name, dev->irq);
                   goto out;
      }
      /*
       *  Now we have the IRQ number so we can disable the interrupts from
       *  the board until the board is opened.
       */
      outb_control(adapter->hcr_val & ~CMDE, dev);

      /*
       * copy Ethernet address into structure
       */
      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];

      /* find a DMA channel */
      if (!dev->dma) {
            if (dev->mem_start) {
                  dev->dma = dev->mem_start & 7;
            }
            else {
                  printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
                  dev->dma = ELP_DMA;
            }
      }

      /*
       * print remainder of startup message
       */
      printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, "
             "addr %s, ",
             dev->name, dev->base_addr, dev->irq, dev->dma,
             print_mac(mac, dev->dev_addr));

      /*
       * read more information from the adapter
       */

      adapter->tx_pcb.command = CMD_ADAPTER_INFO;
      adapter->tx_pcb.length = 0;
      if (!send_pcb(dev, &adapter->tx_pcb) ||
          !receive_pcb(dev, &adapter->rx_pcb) ||
          (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
          (adapter->rx_pcb.length != 10)) {
            printk("not responding to second PCB\n");
      }
      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);

      /*
       * reconfigure the adapter memory to better suit our purposes
       */
      adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
      adapter->tx_pcb.length = 12;
      adapter->tx_pcb.data.memconf.cmd_q = 8;
      adapter->tx_pcb.data.memconf.rcv_q = 8;
      adapter->tx_pcb.data.memconf.mcast = 10;
      adapter->tx_pcb.data.memconf.frame = 10;
      adapter->tx_pcb.data.memconf.rcv_b = 10;
      adapter->tx_pcb.data.memconf.progs = 0;
      if (!send_pcb(dev, &adapter->tx_pcb) ||
          !receive_pcb(dev, &adapter->rx_pcb) ||
          (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
          (adapter->rx_pcb.length != 2)) {
            printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
      }
      if (adapter->rx_pcb.data.configure) {
            printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
      }

      dev->open = elp_open;                     /* local */
      dev->stop = elp_close;                    /* local */
      dev->get_stats = elp_get_stats;                 /* local */
      dev->hard_start_xmit = elp_start_xmit;          /* local */
      dev->tx_timeout = elp_timeout;                  /* local */
      dev->watchdog_timeo = 10*HZ;
      dev->set_multicast_list = elp_set_mc_list;      /* local */
      dev->ethtool_ops = &netdev_ethtool_ops;         /* local */

      memset(&(adapter->stats), 0, sizeof(struct net_device_stats));
      dev->mem_start = dev->mem_end = 0;

      err = register_netdev(dev);
      if (err)
            goto out;

      return 0;
out:
      release_region(dev->base_addr, ELP_IO_EXTENT);
      return err;
}

#ifndef MODULE
struct net_device * __init elplus_probe(int unit)
{
      struct net_device *dev = alloc_etherdev(sizeof(elp_device));
      int err;
      if (!dev)
            return ERR_PTR(-ENOMEM);

      sprintf(dev->name, "eth%d", unit);
      netdev_boot_setup_check(dev);

      err = elplus_setup(dev);
      if (err) {
            free_netdev(dev);
            return ERR_PTR(err);
      }
      return dev;
}

#else
static struct net_device *dev_3c505[ELP_MAX_CARDS];
static int io[ELP_MAX_CARDS];
static int irq[ELP_MAX_CARDS];
static int dma[ELP_MAX_CARDS];
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(dma, int, NULL, 0);
MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");

int __init init_module(void)
{
      int this_dev, found = 0;

      for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
            struct net_device *dev = alloc_etherdev(sizeof(elp_device));
            if (!dev)
                  break;

            dev->irq = irq[this_dev];
            dev->base_addr = io[this_dev];
            if (dma[this_dev]) {
                  dev->dma = dma[this_dev];
            } else {
                  dev->dma = ELP_DMA;
                  printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
            }
            if (io[this_dev] == 0) {
                  if (this_dev) {
                        free_netdev(dev);
                        break;
                  }
                  printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
            }
            if (elplus_setup(dev) != 0) {
                  printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
                  free_netdev(dev);
                  break;
            }
            dev_3c505[this_dev] = dev;
            found++;
      }
      if (!found)
            return -ENODEV;
      return 0;
}

void __exit cleanup_module(void)
{
      int this_dev;

      for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
            struct net_device *dev = dev_3c505[this_dev];
            if (dev) {
                  unregister_netdev(dev);
                  release_region(dev->base_addr, ELP_IO_EXTENT);
                  free_netdev(dev);
            }
      }
}

#endif                        /* MODULE */
MODULE_LICENSE("GPL");

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