1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 1732 insertions, 0 deletions

diff --git a/linux/src/drivers/net/3c505.c b/linux/src/drivers/net/3c505.c
new file mode 100644
index 0000000..b2163ec
--- /dev/null
+++ b/linux/src/drivers/net/3c505.c
@@ -0,0 +1,1732 @@
+/*
+ * 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 1.1 1999/04/26 05:51:48 tb 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>
+ *              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 and DMA version by Philip Blundell
+ */
+
+/* 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.
+ *
+ * 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 will not work with revision 2 hardware, because the host
+ * control register is write-only.  It should be fairly easy to arrange to
+ * keep our own soft-copy of the intended contents of this register, if
+ * somebody has the time.  There may be firmware differences that cause
+ * other problems, though, and I don't have an old card to test.
+ */
+
+/* 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/sched.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/malloc.h>
+#include <linux/ioport.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include "3c505.h"
+
+#define ELP_DMA      6		/* DMA channel to use */
+#define ELP_RX_PCBS  4
+
+/*********************************************************
+ *
+ *  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 const char *search_msg = "%s: Looking for 3c505 adapter at address %#x...";
+
+static const char *stilllooking_msg = "still looking...";
+
+static const char *found_msg = "found.\n";
+
+static const char *notfound_msg = "not found (reason = %d)\n";
+
+static const char *couldnot_msg = "%s: 3c505 not found\n";
+
+/*********************************************************
+ *
+ *  various other debug stuff
+ *
+ *********************************************************/
+
+#ifdef ELP_DEBUG
+static const int elp_debug = ELP_DEBUG;
+#else
+static const int elp_debug = 0;
+#endif
+
+/*
+ *  0 = no messages (well, some)
+ *  1 = messages when high level commands performed
+ *  2 = messages when low level commands performed
+ *  3 = messages when interrupts received
+ */
+
+/*****************************************************************
+ *
+ * useful macros
+ *
+ *****************************************************************/
+
+#ifndef	TRUE
+#define	TRUE	1
+#endif
+
+#ifndef	FALSE
+#define	FALSE	0
+#endif
+
+
+/*****************************************************************
+ *
+ * List of I/O-addresses we try to auto-sense
+ * Last element MUST BE 0!
+ *****************************************************************/
+
+const int addr_list[] = {0x300, 0x280, 0x310, 0};
+
+/* Dma Memory related stuff */
+
+/* Pure 2^n version of get_order */
+static inline int __get_order(unsigned long size)
+{
+	int order;
+
+	size = (size - 1) >> (PAGE_SHIFT - 1);
+	order = -1;
+	do {
+		size >>= 1;
+		order++;
+	} while (size);
+	return order;
+}
+
+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 unsigned char inb_control(unsigned int base_addr)
+{
+	return inb(base_addr + PORT_CONTROL);
+}
+
+static inline int inb_command(unsigned int base_addr)
+{
+	return inb(base_addr + PORT_COMMAND);
+}
+
+static inline void outb_control(unsigned char val, unsigned int base_addr)
+{
+	outb(val, base_addr + PORT_CONTROL);
+}
+
+static inline void outb_command(unsigned char val, unsigned int base_addr)
+{
+	outb(val, base_addr + PORT_COMMAND);
+}
+
+static inline unsigned int inw_data(unsigned int base_addr)
+{
+	return inw(base_addr + PORT_DATA);
+}
+
+static inline void outw_data(unsigned int val, unsigned int base_addr)
+{
+	outw(val, base_addr + PORT_DATA);
+}
+
+
+/*****************************************************************
+ *
+ *  structure to hold context information for adapter
+ *
+ *****************************************************************/
+
+#define DMA_BUFFER_SIZE  1600
+#define BACKLOG_SIZE      4
+
+typedef struct {
+	volatile short got[NUM_TRANSMIT_CMDS];	/* flags for command completion */
+	pcb_struct tx_pcb;	/* PCB for foreground sending */
+	pcb_struct rx_pcb;	/* PCB for foreground receiving */
+	pcb_struct itx_pcb;	/* PCB for background sending */
+	pcb_struct irx_pcb;	/* PCB for background receiving */
+	struct enet_statistics stats;
+
+	void *dma_buffer;
+
+	struct {
+		unsigned int length[BACKLOG_SIZE];
+		unsigned int in;
+		unsigned int out;
+	} rx_backlog;
+
+	struct {
+		unsigned int direction;
+		unsigned int length;
+		unsigned int copy_flag;
+		struct sk_buff *skb;
+		long int start_time;
+	} current_dma;
+
+	/* flags */
+	unsigned long send_pcb_semaphore;
+	unsigned int dmaing;
+	unsigned long busy;
+
+	unsigned int rx_active;  /* number of receive PCBs */
+} elp_device;
+
+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)
+{
+	int timeout = jiffies + 10;
+	register int stat1;
+	do {
+		stat1 = inb_status(base_addr);
+	} while (stat1 != inb_status(base_addr) && jiffies < timeout);
+	if (jiffies >= timeout)
+		TIMEOUT_MSG(__LINE__);
+	return stat1;
+}
+
+static inline void set_hsf(unsigned int base_addr, int hsf)
+{
+	cli();
+	outb_control((inb_control(base_addr) & ~HSF_PCB_MASK) | hsf, base_addr);
+	sti();
+}
+
+static int start_receive(struct device *, pcb_struct *);
+
+inline static void adapter_reset(struct device *dev)
+{
+	int timeout;
+	unsigned char orig_hcr = inb_control(dev->base_addr);
+
+	elp_device *adapter = dev->priv;
+
+	outb_control(0, dev->base_addr);
+
+	if (inb_status(dev->base_addr) & ACRF) {
+		do {
+			inb_command(dev->base_addr);
+			timeout = jiffies + 2;
+			while ((jiffies <= timeout) && !(inb_status(dev->base_addr) & ACRF));
+		} while (inb_status(dev->base_addr) & ACRF);
+		set_hsf(dev->base_addr, HSF_PCB_NAK);
+	}
+	outb_control(inb_control(dev->base_addr) | ATTN | DIR, dev->base_addr);
+	timeout = jiffies + 1;
+	while (jiffies <= timeout);
+	outb_control(inb_control(dev->base_addr) & ~ATTN, dev->base_addr);
+	timeout = jiffies + 1;
+	while (jiffies <= timeout);
+	outb_control(inb_control(dev->base_addr) | FLSH, dev->base_addr);
+	timeout = jiffies + 1;
+	while (jiffies <= timeout);
+	outb_control(inb_control(dev->base_addr) & ~FLSH, dev->base_addr);
+	timeout = jiffies + 1;
+	while (jiffies <= timeout);
+
+	outb_control(orig_hcr, dev->base_addr);
+	if (!start_receive(dev, &adapter->tx_pcb))
+		printk("%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_dma(struct device *dev)
+{
+	elp_device *adapter = dev->priv;
+	if (adapter->dmaing && (jiffies > (adapter->current_dma.start_time + 10))) {
+		unsigned long flags;
+		printk("%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma));
+		save_flags(flags);
+		cli();
+		adapter->dmaing = 0;
+		adapter->busy = 0;
+		disable_dma(dev->dma);
+		if (adapter->rx_active)
+			adapter->rx_active--;
+		outb_control(inb_control(dev->base_addr) & ~(DMAE | TCEN | DIR), dev->base_addr);
+		restore_flags(flags);
+	}
+}
+
+/* Primitive functions used by send_pcb() */
+static inline unsigned int send_pcb_slow(unsigned int base_addr, unsigned char byte)
+{
+	unsigned int timeout;
+	outb_command(byte, base_addr);
+	for (timeout = jiffies + 5; jiffies < timeout;) {
+		if (inb_status(base_addr) & HCRE)
+			return FALSE;
+	}
+	printk("3c505: send_pcb_slow timed out\n");
+	return TRUE;
+}
+
+static inline unsigned int 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("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 device *dev)
+{
+	elp_device *adapter = dev->priv;
+	while (adapter->rx_active < ELP_RX_PCBS && dev->start) {
+		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 int send_pcb(struct device *dev, pcb_struct * pcb)
+{
+	int i;
+	int timeout;
+	elp_device *adapter = dev->priv;
+
+	check_dma(dev);
+
+	if (adapter->dmaing && adapter->current_dma.direction == 0)
+		return FALSE;
+
+	/* Avoid contention */
+	if (set_bit(1, &adapter->send_pcb_semaphore)) {
+		if (elp_debug >= 3) {
+			printk("%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->base_addr, 0);
+
+	if (send_pcb_slow(dev->base_addr, pcb->command))
+		goto abort;
+
+	cli();
+
+	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(inb_control(dev->base_addr) | 3, dev->base_addr);	/* signal end of PCB */
+	outb_command(2 + pcb->length, dev->base_addr);
+
+	/* now wait for the acknowledgement */
+	sti();
+
+	for (timeout = jiffies + 5; jiffies < timeout;) {
+		switch (GET_ASF(dev->base_addr)) {
+		case ASF_PCB_ACK:
+			adapter->send_pcb_semaphore = 0;
+			return TRUE;
+			break;
+		case ASF_PCB_NAK:
+			printk("%s: send_pcb got NAK\n", dev->name);
+			goto abort;
+			break;
+		}
+	}
+
+	if (elp_debug >= 1)
+		printk("%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
+
+      sti_abort:
+	sti();
+      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 int receive_pcb(struct device *dev, pcb_struct * pcb)
+{
+	int i, j;
+	int total_length;
+	int stat;
+	int timeout;
+
+	elp_device *adapter = dev->priv;
+
+	set_hsf(dev->base_addr, 0);
+
+	/* get the command code */
+	timeout = jiffies + 2;
+	while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && jiffies < timeout);
+	if (jiffies >= timeout) {
+		TIMEOUT_MSG(__LINE__);
+		return FALSE;
+	}
+	pcb->command = inb_command(dev->base_addr);
+
+	/* read the data length */
+	timeout = jiffies + 3;
+	while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && jiffies < timeout);
+	if (jiffies >= timeout) {
+		TIMEOUT_MSG(__LINE__);
+		printk("%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 */
+	cli();
+	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);
+	sti();
+	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("%s: mangled PCB received\n", dev->name);
+		set_hsf(dev->base_addr, HSF_PCB_NAK);
+		return FALSE;
+	}
+
+	if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
+		if (set_bit(0, (void *) &adapter->busy)) {
+			if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
+				set_hsf(dev->base_addr, HSF_PCB_NAK);
+				printk("%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
+				pcb->command = 0;
+				return TRUE;
+			} else {
+				pcb->command = 0xff;
+			}
+		}
+	}
+	set_hsf(dev->base_addr, HSF_PCB_ACK);
+	return TRUE;
+}
+
+/******************************************************
+ *
+ *  queue a receive command on the adapter so we will get an
+ *  interrupt when a packet is received.
+ *
+ ******************************************************/
+
+static int start_receive(struct device *dev, pcb_struct * tx_pcb)
+{
+	int status;
+	elp_device *adapter = dev->priv;
+
+	if (elp_debug >= 3)
+		printk("%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 device *dev, int len)
+{
+	int rlen;
+	elp_device *adapter = dev->priv;
+	unsigned long target;
+	struct sk_buff *skb;
+
+	rlen = (len + 1) & ~1;
+	skb = dev_alloc_skb(rlen + 2);
+
+	adapter->current_dma.copy_flag = 0;
+
+	if (!skb) {
+	  printk("%s: memory squeeze, dropping packet\n", dev->name);
+	  target = virt_to_bus(adapter->dma_buffer);
+	} else {
+	  skb_reserve(skb, 2);
+	  target = virt_to_bus(skb_put(skb, rlen));
+	  if ((target + rlen) >= MAX_DMA_ADDRESS) {
+	    target = virt_to_bus(adapter->dma_buffer);
+	    adapter->current_dma.copy_flag = 1;
+	  }
+	}
+	/* if this happens, we die */
+	if (set_bit(0, (void *) &adapter->dmaing))
+		printk("%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(inb_control(dev->base_addr) | DIR | TCEN | DMAE, dev->base_addr);
+
+	disable_dma(dev->dma);
+	clear_dma_ff(dev->dma);
+	set_dma_mode(dev->dma, 0x04);	/* dma read */
+	set_dma_addr(dev->dma, target);
+	set_dma_count(dev->dma, rlen);
+	enable_dma(dev->dma);
+
+	if (elp_debug >= 3) {
+		printk("%s: rx DMA transfer started\n", dev->name);
+	}
+	if (adapter->rx_active)
+		adapter->rx_active--;
+
+	if (!adapter->busy)
+		printk("%s: receive_packet called, busy not set.\n", dev->name);
+}
+
+/******************************************************
+ *
+ * interrupt handler
+ *
+ ******************************************************/
+
+static void elp_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr)
+{
+	int len;
+	int dlen;
+	int icount = 0;
+	struct device *dev;
+	elp_device *adapter;
+	int timeout;
+
+	if (irq < 0 || irq > 15) {
+		printk("elp_interrupt(): illegal IRQ number found in interrupt routine (%i)\n", irq);
+		return;
+	}
+	dev = irq2dev_map[irq];
+
+	if (dev == NULL) {
+		printk("elp_interrupt(): irq %d for unknown device.\n", irq);
+		return;
+	}
+	adapter = (elp_device *) dev->priv;
+
+	if (dev->interrupt) {
+		printk("%s: re-entering the interrupt handler!\n", dev->name);
+		return;
+	}
+	dev->interrupt = 1;
+
+	do {
+		/*
+		 * has a DMA transfer finished?
+		 */
+		if (inb_status(dev->base_addr) & DONE) {
+			if (!adapter->dmaing) {
+				printk("%s: phantom DMA completed\n", dev->name);
+			}
+			if (elp_debug >= 3) {
+				printk("%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
+			}
+
+			outb_control(inb_control(dev->base_addr) & ~(DMAE | TCEN | DIR), dev->base_addr);
+			if (adapter->current_dma.direction) {
+				dev_kfree_skb(adapter->current_dma.skb, FREE_WRITE);
+			} else {
+				struct sk_buff *skb = adapter->current_dma.skb;
+				if (skb) {
+				  skb->dev = dev;
+				  if (adapter->current_dma.copy_flag) {
+				    memcpy(skb_put(skb, adapter->current_dma.length), adapter->dma_buffer, adapter->current_dma.length);
+				  }
+				  skb->protocol = eth_type_trans(skb,dev);
+				  netif_rx(skb);
+				}
+			}
+			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("%s: receiving backlogged packet (%d)\n", dev->name, t);
+				receive_packet(dev, t);
+			} else {
+				adapter->busy = 0;
+			}
+		} else {
+			/* has one timed out? */
+			check_dma(dev);
+		}
+
+		sti();
+
+		/*
+		 * receive a PCB from the adapter
+		 */
+		timeout = jiffies + 3;
+		while ((inb_status(dev->base_addr) & ACRF) != 0 && 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 (dev->start == 0)
+						break;
+					cli();
+					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("%s: interrupt - packet not received correctly\n", dev->name);
+						sti();
+					} else {
+						if (elp_debug >= 3) {
+							sti();
+							printk("%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
+							cli();
+						}
+						if (adapter->irx_pcb.command == 0xff) {
+							if (elp_debug >= 2)
+								printk("%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);
+						}
+						sti();
+						if (elp_debug >= 3)
+							printk("%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("%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("%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("%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("%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("%s: interrupt - statistics response received\n", dev->name);
+					break;
+
+					/*
+					 * sent a packet
+					 */
+				case CMD_TRANSMIT_PACKET_COMPLETE:
+					if (elp_debug >= 3)
+						printk("%s: interrupt - packet sent\n", dev->name);
+					if (dev->start == 0)
+						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;
+					}
+					dev->tbusy = 0;
+					mark_bh(NET_BH);
+					break;
+
+					/*
+					 * some unknown PCB
+					 */
+				default:
+					printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
+					break;
+				}
+			} else {
+				printk("%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
+	 */
+	dev->interrupt = 0;
+}
+
+
+/******************************************************
+ *
+ * open the board
+ *
+ ******************************************************/
+
+static int elp_open(struct device *dev)
+{
+	elp_device *adapter;
+
+	adapter = dev->priv;
+
+	if (elp_debug >= 3)
+		printk("%s: request to open device\n", dev->name);
+
+	/*
+	 * make sure we actually found the device
+	 */
+	if (adapter == NULL) {
+		printk("%s: Opening a non-existent physical device\n", dev->name);
+		return -EAGAIN;
+	}
+	/*
+	 * disable interrupts on the board
+	 */
+	outb_control(0x00, dev->base_addr);
+
+	/*
+	 * clear any pending interrupts
+	 */
+	inb_command(dev->base_addr);
+	adapter_reset(dev);
+
+	/*
+	 * interrupt routine not entered
+	 */
+	dev->interrupt = 0;
+
+	/*
+	 *  transmitter not busy 
+	 */
+	dev->tbusy = 0;
+
+	/*
+	 * 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;
+
+	/*
+	 * make sure we can find the device header given the interrupt number
+	 */
+	irq2dev_map[dev->irq] = dev;
+
+	/*
+	 * install our interrupt service routine
+	 */
+	if (request_irq(dev->irq, &elp_interrupt, 0, "3c505", NULL)) {
+		irq2dev_map[dev->irq] = NULL;
+		return -EAGAIN;
+	}
+	if (request_dma(dev->dma, "3c505")) {
+		printk("%s: could not allocate DMA channel\n", dev->name);
+		return -EAGAIN;
+	}
+	adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
+	if (!adapter->dma_buffer) {
+		printk("Could not allocate DMA buffer\n");
+	}
+	adapter->dmaing = 0;
+
+	/*
+	 * enable interrupts on the board
+	 */
+	outb_control(CMDE, dev->base_addr);
+
+	/*
+	 * device is now officially open!
+	 */
+	dev->start = 1;
+
+	/*
+	 * configure adapter memory: we need 10 multicast addresses, default==0
+	 */
+	if (elp_debug >= 3)
+		printk("%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("%s: couldn't send memory configuration command\n", dev->name);
+	else {
+		int timeout = jiffies + TIMEOUT;
+		while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && jiffies < timeout);
+		if (jiffies >= timeout)
+			TIMEOUT_MSG(__LINE__);
+	}
+
+
+	/*
+	 * configure adapter to receive broadcast messages and wait for response
+	 */
+	if (elp_debug >= 3)
+		printk("%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("%s: couldn't send 82586 configure command\n", dev->name);
+	else {
+		int timeout = jiffies + TIMEOUT;
+		while (adapter->got[CMD_CONFIGURE_82586] == 0 && jiffies < timeout);
+		if (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("%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
+
+	MOD_INC_USE_COUNT;
+
+	return 0;		/* Always succeed */
+}
+
+
+/******************************************************
+ *
+ * send a packet to the adapter
+ *
+ ******************************************************/
+
+static int send_packet(struct device *dev, struct sk_buff *skb)
+{
+	elp_device *adapter = dev->priv;
+	unsigned long target;
+
+	/*
+	 * make sure the length is even and no shorter than 60 bytes
+	 */
+	unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
+
+	if (set_bit(0, (void *) &adapter->busy)) {
+		if (elp_debug >= 2)
+			printk("%s: transmit blocked\n", dev->name);
+		return FALSE;
+	}
+	adapter = dev->priv;
+
+	/*
+	 * 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 (set_bit(0, (void *) &adapter->dmaing))
+		printk("%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
+
+	adapter->current_dma.direction = 1;
+	adapter->current_dma.start_time = jiffies;
+
+	target = virt_to_bus(skb->data);
+	if ((target + nlen) >= MAX_DMA_ADDRESS) {
+		memcpy(adapter->dma_buffer, skb->data, nlen);
+		target = virt_to_bus(adapter->dma_buffer);
+	}
+	adapter->current_dma.skb = skb;
+	cli();
+	disable_dma(dev->dma);
+	clear_dma_ff(dev->dma);
+	set_dma_mode(dev->dma, 0x08);	/* dma memory -> io */
+	set_dma_addr(dev->dma, target);
+	set_dma_count(dev->dma, nlen);
+	enable_dma(dev->dma);
+	outb_control(inb_control(dev->base_addr) | DMAE | TCEN, dev->base_addr);
+	if (elp_debug >= 3)
+		printk("%s: DMA transfer started\n", dev->name);
+
+	return TRUE;
+}
+
+/******************************************************
+ *
+ * start the transmitter
+ *    return 0 if sent OK, else return 1
+ *
+ ******************************************************/
+
+static int elp_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+	if (dev->interrupt) {
+		printk("%s: start_xmit aborted (in irq)\n", dev->name);
+		return 1;
+	}
+
+	check_dma(dev);
+
+	/*
+	 * if the transmitter is still busy, we have a transmit timeout...
+	 */
+	if (dev->tbusy) {
+		elp_device *adapter = dev->priv;
+       		int tickssofar = jiffies - dev->trans_start;
+		int stat;
+
+		if (tickssofar < 1000)
+			return 1;
+
+		stat = inb_status(dev->base_addr);
+		printk("%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
+		if (elp_debug >= 1)
+			printk("%s: status %#02x\n", dev->name, stat);
+		dev->trans_start = jiffies;
+		dev->tbusy = 0;
+		adapter->stats.tx_dropped++;
+	}
+
+	/* Some upper layer thinks we've missed a tx-done interrupt */
+	if (skb == NULL) {
+		dev_tint(dev);
+		return 0;
+	}
+
+	if (skb->len <= 0)
+		return 0;
+
+	if (elp_debug >= 3)
+		printk("%s: request to send packet of length %d\n", dev->name, (int) skb->len);
+
+	if (set_bit(0, (void *) &dev->tbusy)) {
+		printk("%s: transmitter access conflict\n", dev->name);
+		return 1;
+	}
+	/*
+	 * send the packet at skb->data for skb->len
+	 */
+	if (!send_packet(dev, skb)) {
+		if (elp_debug >= 2) {
+			printk("%s: failed to transmit packet\n", dev->name);
+		}
+		dev->tbusy = 0;
+		return 1;
+	}
+	if (elp_debug >= 3)
+		printk("%s: packet of length %d sent\n", dev->name, (int) skb->len);
+
+	/*
+	 * start the transmit timeout
+	 */
+	dev->trans_start = jiffies;
+
+	prime_rx(dev);
+
+	return 0;
+}
+
+/******************************************************
+ *
+ * return statistics on the board
+ *
+ ******************************************************/
+
+static struct enet_statistics *elp_get_stats(struct device *dev)
+{
+	elp_device *adapter = (elp_device *) dev->priv;
+
+	if (elp_debug >= 3)
+		printk("%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 (!dev->start)
+		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("%s: couldn't send get statistics command\n", dev->name);
+	else {
+		int timeout = jiffies + TIMEOUT;
+		while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && jiffies < timeout);
+		if (jiffies >= timeout) {
+			TIMEOUT_MSG(__LINE__);
+			return &adapter->stats;
+		}
+	}
+
+	/* statistics are now up to date */
+	return &adapter->stats;
+}
+
+/******************************************************
+ *
+ * close the board
+ *
+ ******************************************************/
+
+static int elp_close(struct device *dev)
+{
+	elp_device *adapter;
+
+	adapter = dev->priv;
+
+	if (elp_debug >= 3)
+		printk("%s: request to close device\n", dev->name);
+
+	/* 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(0x00, dev->base_addr);
+
+	/*
+	 *  flag transmitter as busy (i.e. not available)
+	 */
+	dev->tbusy = 1;
+
+	/*
+	 *  indicate device is closed
+	 */
+	dev->start = 0;
+
+	/*
+	 * release the IRQ
+	 */
+	free_irq(dev->irq, NULL);
+
+	/*
+	 * and we no longer have to map irq to dev either
+	 */
+	irq2dev_map[dev->irq] = 0;
+
+	free_dma(dev->dma);
+	free_pages((unsigned long) adapter->dma_buffer, __get_order(DMA_BUFFER_SIZE));
+
+	MOD_DEC_USE_COUNT;
+
+	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 device *dev)
+{
+	elp_device *adapter = (elp_device *) dev->priv;
+	struct dev_mc_list *dmi = dev->mc_list;
+	int i;
+
+	if (elp_debug >= 3)
+		printk("%s: request to set multicast list\n", dev->name);
+
+	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("%s: couldn't send set_multicast command\n", dev->name);
+		else {
+			int timeout = jiffies + TIMEOUT;
+			while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && jiffies < timeout);
+			if (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("%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))
+		printk("%s: couldn't send 82586 configure command\n", dev->name);
+	else {
+		int timeout = jiffies + TIMEOUT;
+		while (adapter->got[CMD_CONFIGURE_82586] == 0 && jiffies < timeout);
+		if (jiffies >= timeout)
+			TIMEOUT_MSG(__LINE__);
+	}
+}
+
+/******************************************************
+ *
+ * initialise Etherlink Plus board
+ *
+ ******************************************************/
+
+static void elp_init(struct device *dev)
+{
+	elp_device *adapter = dev->priv;
+
+	/*
+	 * set ptrs to various functions
+	 */
+	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->set_multicast_list = elp_set_mc_list;	/* local */
+
+	/* Setup the generic properties */
+	ether_setup(dev);
+
+	/*
+	 * setup ptr to adapter specific information
+	 */
+	memset(&(adapter->stats), 0, sizeof(struct enet_statistics));
+
+	/*
+	 * memory information
+	 */
+	dev->mem_start = dev->mem_end = dev->rmem_end = dev->rmem_start = 0;
+}
+
+/************************************************************
+ *
+ * A couple of tests to see if there's 3C505 or not
+ * Called only by elp_autodetect
+ ************************************************************/
+
+static int elp_sense(struct device *dev)
+{
+	int timeout;
+	int addr = dev->base_addr;
+	const char *name = dev->name;
+	long flags;
+	byte orig_HCR, orig_HSR;
+
+	if (check_region(addr, 0xf))
+		return -1;
+
+	orig_HCR = inb_control(addr);
+	orig_HSR = inb_status(addr);
+
+	if (elp_debug > 0)
+		printk(search_msg, name, addr);
+
+	if (((orig_HCR == 0xff) && (orig_HSR == 0xff)) ||
+	    ((orig_HCR & DIR) != (orig_HSR & DIR))) {
+		if (elp_debug > 0)
+			printk(notfound_msg, 1);
+		return -1;	/* It can't be 3c505 if HCR.DIR != HSR.DIR */
+	}
+	/* Enable interrupts - we need timers! */
+	save_flags(flags);
+	sti();
+
+	/* Wait for a while; the adapter may still be booting up */
+	if (elp_debug > 0)
+		printk(stilllooking_msg);
+	if (orig_HCR & DIR) {
+		/* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
+		outb_control(orig_HCR & ~DIR, addr);
+		timeout = jiffies + 30;
+		while (jiffies < timeout);
+		restore_flags(flags);
+		if (inb_status(addr) & DIR) {
+			outb_control(orig_HCR, addr);
+			if (elp_debug > 0)
+				printk(notfound_msg, 2);
+			return -1;
+		}
+	} else {
+		/* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
+		outb_control(orig_HCR | DIR, addr);
+		timeout = jiffies + 30;
+		while (jiffies < timeout);
+		restore_flags(flags);
+		if (!(inb_status(addr) & DIR)) {
+			outb_control(orig_HCR, addr);
+			if (elp_debug > 0)
+				printk(notfound_msg, 3);
+			return -1;
+		}
+	}
+	/*
+	 * It certainly looks like a 3c505. If it has DMA enabled, it needs
+	 * a hard reset. Also, do a hard reset if selected at the compile time.
+	 */
+	if (elp_debug > 0)
+		printk(found_msg);
+
+	return 0;
+}
+
+/*************************************************************
+ *
+ * Search through addr_list[] and try to find a 3C505
+ * Called only by eplus_probe
+ *************************************************************/
+
+static int elp_autodetect(struct 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).
+ */
+
+int elplus_probe(struct device *dev)
+{
+	elp_device *adapter;
+	int i, tries, tries1, timeout, okay;
+
+	/*
+	 *  setup adapter structure
+	 */
+
+	dev->base_addr = elp_autodetect(dev);
+	if (!(dev->base_addr))
+		return -ENODEV;
+
+	/*
+	 * setup ptr to adapter specific information
+	 */
+	adapter = (elp_device *) (dev->priv = kmalloc(sizeof(elp_device), GFP_KERNEL));
+	if (adapter == NULL) {
+		printk("%s: out of memory\n", dev->name);
+		return -ENODEV;
+        }
+
+	for (tries1 = 0; tries1 < 3; tries1++) {
+		outb_control((inb_control(dev->base_addr) | CMDE) & ~DIR, dev->base_addr);
+		/* First try to write just one byte, to see if the card is
+		 * responding at all normally.
+		 */
+		timeout = jiffies + 5;
+		okay = 0;
+		while (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;
+			while (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("%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 (jiffies < timeout && (inb_status(dev->base_addr) & 7));
+				if (inb_status(dev->base_addr) & 7) {
+					printk("%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;
+			autoirq_setup(0);
+			if (!send_pcb(dev, &adapter->tx_pcb)) {
+				printk("%s: could not send first PCB\n", dev->name);
+				autoirq_report(0);
+				continue;
+			}
+			if (!receive_pcb(dev, &adapter->rx_pcb)) {
+				printk("%s: could not read first PCB\n", dev->name);
+				autoirq_report(0);
+				continue;
+			}
+			if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
+			    (adapter->rx_pcb.length != 6)) {
+				printk("%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
+				autoirq_report(0);
+				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(inb_control(dev->base_addr) | FLSH | ATTN, dev->base_addr);
+		outb_control(inb_control(dev->base_addr) & ~(FLSH | ATTN), dev->base_addr);
+	}
+	printk("%s: failed to initialise 3c505\n", dev->name);
+	return -ENODEV;
+
+      okay:
+	if (dev->irq) {		/* Is there a preset IRQ? */
+		int rpt = autoirq_report(0);
+		if (dev->irq != rpt) {
+			printk("%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
+			return -ENODEV;
+		}
+		/* if dev->irq == autoirq_report(0), all is well */
+	} else			/* No preset IRQ; just use what we can detect */
+		dev->irq = autoirq_report(0);
+	switch (dev->irq) {	/* Legal, sane? */
+	case 0:
+		printk("%s: No IRQ reported by autoirq_report().\n", dev->name);
+		printk("%s: Check the jumpers of your 3c505 board.\n", dev->name);
+		return -ENODEV;
+	case 1:
+	case 6:
+	case 8:
+	case 13:
+		printk("%s: Impossible IRQ %d reported by autoirq_report().\n",
+		       dev->name, dev->irq);
+		return -ENODEV;
+	}
+	/*
+	 *  Now we have the IRQ number so we can disable the interrupts from
+	 *  the board until the board is opened.
+	 */
+	outb_control(inb_control(dev->base_addr) & ~CMDE, dev->base_addr);
+
+	/*
+	 * copy ethernet address into structure
+	 */
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
+
+	/* set up the DMA channel */
+	dev->dma = ELP_DMA;
+
+	/*
+	 * print remainder of startup message
+	 */
+	printk("%s: 3c505 at %#lx, irq %d, dma %d, ",
+	       dev->name, dev->base_addr, dev->irq, dev->dma);
+	printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
+	       dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
+	       dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
+
+	/*
+	 * 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("%s: not responding to second PCB\n", dev->name);
+	}
+	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("%s: could not configure adapter memory\n", dev->name);
+	}
+	if (adapter->rx_pcb.data.configure) {
+		printk("%s: adapter configuration failed\n", dev->name);
+	}
+	/*
+	 * and reserve the address region
+	 */
+	request_region(dev->base_addr, ELP_IO_EXTENT, "3c505");
+
+	/*
+	 * initialise the device
+	 */
+	elp_init(dev);
+
+	return 0;
+}
+
+#ifdef MODULE
+static char devicename[9] = {0,};
+static struct device dev_3c505 =
+{
+	devicename,		/* device name is inserted by linux/drivers/net/net_init.c */
+	0, 0, 0, 0,
+	0, 0,
+	0, 0, 0, NULL, elplus_probe};
+
+int io = 0x300;
+int irq = 0;
+
+int init_module(void)
+{
+	if (io == 0)
+		printk("3c505: You should not use auto-probing with insmod!\n");
+	dev_3c505.base_addr = io;
+	dev_3c505.irq = irq;
+	if (register_netdev(&dev_3c505) != 0) {
+		return -EIO;
+	}
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	unregister_netdev(&dev_3c505);
+	kfree(dev_3c505.priv);
+	dev_3c505.priv = NULL;
+
+	/* If we don't do this, we can't re-insmod it later. */
+	release_region(dev_3c505.base_addr, ELP_IO_EXTENT);
+}
+
+#endif				/* MODULE */
+
+
+/*
+ * Local Variables:
+ *  c-file-style: "linux"
+ *  tab-width: 8
+ *  compile-command: "gcc -D__KERNEL__ -I/discs/bibble/src/linux-1.3.69/include  -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strength-reduce -pipe -m486 -DCPU=486 -DMODULE  -c 3c505.c"
+ * End:
+ */