Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1690 insertions, 0 deletions

diff --git a/drivers/net/3c505.c b/drivers/net/3c505.c
new file mode 100644
index 000000000000..76fa8cc24085
--- /dev/null
+++ b/drivers/net/3c505.c
@@ -0,0 +1,1690 @@
+/*
+ * 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
+ */
+
+/*****************************************************************
+ *
+ * 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!
+ *****************************************************************/
+
+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 int start_receive(struct net_device *, pcb_struct *);
+
+inline static 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 unsigned int 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 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(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 int 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 int 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 int start_receive(struct net_device *dev, pcb_struct * tx_pcb)
+{
+	int 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);
+
+	skb->dev = dev;
+	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, struct pt_regs *reg_ptr)
+{
+	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 int 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) {
+		memcpy(adapter->dma_buffer, skb->data, 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);
+}
+
+/******************************************************
+ *