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, 1047 insertions, 0 deletions

diff --git a/drivers/net/de620.c b/drivers/net/de620.c
new file mode 100644
index 0000000..0069f5f
--- /dev/null
+++ b/drivers/net/de620.c
@@ -0,0 +1,1047 @@
+/*
+ *	de620.c $Revision: 1.40 $ BETA
+ *
+ *
+ *	Linux driver for the D-Link DE-620 Ethernet pocket adapter.
+ *
+ *	Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se>
+ *
+ *	Based on adapter information gathered from DOS packetdriver
+ *	sources from D-Link Inc:  (Special thanks to Henry Ngai of D-Link.)
+ *		Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992
+ *		Copyright, 1988, Russell Nelson, Crynwr Software
+ *
+ *	Adapted to the sample network driver core for linux,
+ *	written by: Donald Becker <becker@super.org>
+ *		(Now at <becker@scyld.com>)
+ *
+ *	Valuable assistance from:
+ *		J. Joshua Kopper <kopper@rtsg.mot.com>
+ *		Olav Kvittem <Olav.Kvittem@uninett.no>
+ *		Germano Caronni <caronni@nessie.cs.id.ethz.ch>
+ *		Jeremy Fitzhardinge <jeremy@suite.sw.oz.au>
+ *
+ *****************************************************************************/
+/*
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2, or (at your option)
+ *	any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+static const char version[] =
+	"de620.c: $Revision: 1.40 $,  Bjorn Ekwall <bj0rn@blox.se>\n";
+
+/***********************************************************************
+ *
+ * "Tuning" section.
+ *
+ * Compile-time options: (see below for descriptions)
+ * -DDE620_IO=0x378	(lpt1)
+ * -DDE620_IRQ=7	(lpt1)
+ * -DDE602_DEBUG=...
+ * -DSHUTDOWN_WHEN_LOST
+ * -DCOUNT_LOOPS
+ * -DLOWSPEED
+ * -DREAD_DELAY
+ * -DWRITE_DELAY
+ */
+
+/*
+ * This driver assumes that the printer port is a "normal",
+ * dumb, uni-directional port!
+ * If your port is "fancy" in any way, please try to set it to "normal"
+ * with your BIOS setup.  I have no access to machines with bi-directional
+ * ports, so I can't test such a driver :-(
+ * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
+ *
+ * There are some clones of DE620 out there, with different names.
+ * If the current driver does not recognize a clone, try to change
+ * the following #define to:
+ *
+ * #define DE620_CLONE 1
+ */
+#define DE620_CLONE 0
+
+/*
+ * If the adapter has problems with high speeds, enable this #define
+ * otherwise full printerport speed will be attempted.
+ *
+ * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
+ *
+#define LOWSPEED
+ */
+
+#ifndef READ_DELAY
+#define READ_DELAY 100	/* adapter internal read delay in 100ns units */
+#endif
+
+#ifndef WRITE_DELAY
+#define WRITE_DELAY 100	/* adapter internal write delay in 100ns units */
+#endif
+
+/*
+ * Enable this #define if you want the adapter to do a "ifconfig down" on
+ * itself when we have detected that something is possibly wrong with it.
+ * The default behaviour is to retry with "adapter_init()" until success.
+ * This should be used for debugging purposes only.
+ *
+#define SHUTDOWN_WHEN_LOST
+ */
+
+/*
+ * Enable debugging by "-DDE620_DEBUG=3" when compiling,
+ * OR by enabling the following #define
+ *
+ * use 0 for production, 1 for verification, >2 for debug
+ *
+#define DE620_DEBUG 3
+ */
+
+#ifdef LOWSPEED
+/*
+ * Enable this #define if you want to see debugging output that show how long
+ * we have to wait before the DE-620 is ready for the next read/write/command.
+ *
+#define COUNT_LOOPS
+ */
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+
+/* Constant definitions for the DE-620 registers, commands and bits */
+#include "de620.h"
+
+typedef unsigned char byte;
+
+/*******************************************************
+ *                                                     *
+ * Definition of D-Link DE-620 Ethernet Pocket adapter *
+ * See also "de620.h"                                  *
+ *                                                     *
+ *******************************************************/
+#ifndef DE620_IO /* Compile-time configurable */
+#define DE620_IO 0x378
+#endif
+
+#ifndef DE620_IRQ /* Compile-time configurable */
+#define DE620_IRQ	7
+#endif
+
+#define DATA_PORT	(dev->base_addr)
+#define STATUS_PORT	(dev->base_addr + 1)
+#define COMMAND_PORT	(dev->base_addr + 2)
+
+#define RUNT 60		/* Too small Ethernet packet */
+#define GIANT 1514	/* largest legal size packet, no fcs */
+
+#ifdef DE620_DEBUG /* Compile-time configurable */
+#define PRINTK(x) if (de620_debug >= 2) printk x
+#else
+#define DE620_DEBUG 0
+#define PRINTK(x) /**/
+#endif
+
+
+/*
+ * Force media with insmod:
+ *	insmod de620.o bnc=1
+ * or
+ *	insmod de620.o utp=1
+ *
+ * Force io and/or irq with insmod:
+ *	insmod de620.o io=0x378 irq=7
+ *
+ * Make a clone skip the Ethernet-address range check:
+ *	insmod de620.o clone=1
+ */
+static int bnc;
+static int utp;
+static int io  = DE620_IO;
+static int irq = DE620_IRQ;
+static int clone = DE620_CLONE;
+
+static unsigned int de620_debug = DE620_DEBUG;
+
+static spinlock_t de620_lock;
+
+module_param(bnc, int, 0);
+module_param(utp, int, 0);
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(clone, int, 0);
+module_param(de620_debug, int, 0);
+MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
+MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
+MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
+MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
+MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
+MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)");
+
+/***********************************************
+ *                                             *
+ * Index to functions, as function prototypes. *
+ *                                             *
+ ***********************************************/
+
+/*
+ * Routines used internally. (See also "convenience macros.. below")
+ */
+
+/* Put in the device structure. */
+static int	de620_open(struct net_device *);
+static int	de620_close(struct net_device *);
+static struct	net_device_stats *get_stats(struct net_device *);
+static void	de620_set_multicast_list(struct net_device *);
+static int	de620_start_xmit(struct sk_buff *, struct net_device *);
+
+/* Dispatch from interrupts. */
+static irqreturn_t de620_interrupt(int, void *, struct pt_regs *);
+static int	de620_rx_intr(struct net_device *);
+
+/* Initialization */
+static int	adapter_init(struct net_device *);
+static int	read_eeprom(struct net_device *);
+
+
+/*
+ * D-Link driver variables:
+ */
+#define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
+#define	TCR_DEF RXPB			/* not used: | TXSUCINT | T16INT */
+#define DE620_RX_START_PAGE 12		/* 12 pages (=3k) reserved for tx */
+#define DEF_NIC_CMD IRQEN | ICEN | DS1
+
+static volatile byte	NIC_Cmd;
+static volatile byte	next_rx_page;
+static byte		first_rx_page;
+static byte		last_rx_page;
+static byte		EIPRegister;
+
+static struct nic {
+	byte	NodeID[6];
+	byte	RAM_Size;
+	byte	Model;
+	byte	Media;
+	byte	SCR;
+} nic_data;
+
+/**********************************************************
+ *                                                        *
+ * Convenience macros/functions for D-Link DE-620 adapter *
+ *                                                        *
+ **********************************************************/
+#define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
+#define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
+
+/* Check for ready-status, and return a nibble (high 4 bits) for data input */
+#ifdef COUNT_LOOPS
+static int tot_cnt;
+#endif
+static inline byte
+de620_ready(struct net_device *dev)
+{
+	byte value;
+	register short int cnt = 0;
+
+	while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
+		++cnt;
+
+#ifdef COUNT_LOOPS
+	tot_cnt += cnt;
+#endif
+	return value & 0xf0; /* nibble */
+}
+
+static inline void
+de620_send_command(struct net_device *dev, byte cmd)
+{
+	de620_ready(dev);
+	if (cmd == W_DUMMY)
+		outb(NIC_Cmd, COMMAND_PORT);
+
+	outb(cmd, DATA_PORT);
+
+	outb(NIC_Cmd ^ CS0, COMMAND_PORT);
+	de620_ready(dev);
+	outb(NIC_Cmd, COMMAND_PORT);
+}
+
+static inline void
+de620_put_byte(struct net_device *dev, byte value)
+{
+	/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
+	de620_ready(dev);
+	outb(value, DATA_PORT);
+	de620_flip_ds(dev);
+}
+
+static inline byte
+de620_read_byte(struct net_device *dev)
+{
+	byte value;
+
+	/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
+	value = de620_ready(dev); /* High nibble */
+	de620_flip_ds(dev);
+	value |= de620_ready(dev) >> 4; /* Low nibble */
+	return value;
+}
+
+static inline void
+de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
+{
+#ifndef LOWSPEED
+	byte uflip = NIC_Cmd ^ (DS0 | DS1);
+	byte dflip = NIC_Cmd;
+#else /* LOWSPEED */
+#ifdef COUNT_LOOPS
+	int bytes = count;
+#endif /* COUNT_LOOPS */
+#endif /* LOWSPEED */
+
+#ifdef LOWSPEED
+#ifdef COUNT_LOOPS
+	tot_cnt = 0;
+#endif /* COUNT_LOOPS */
+	/* No further optimization useful, the limit is in the adapter. */
+	for ( ; count > 0; --count, ++buffer) {
+		de620_put_byte(dev,*buffer);
+	}
+	for ( count = pad ; count > 0; --count, ++buffer) {
+		de620_put_byte(dev, 0);
+	}
+	de620_send_command(dev,W_DUMMY);
+#ifdef COUNT_LOOPS
+	/* trial debug output: loops per byte in de620_ready() */
+	printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
+#endif /* COUNT_LOOPS */
+#else /* not LOWSPEED */
+	for ( ; count > 0; count -=2) {
+		outb(*buffer++, DATA_PORT);
+		outb(uflip, COMMAND_PORT);
+		outb(*buffer++, DATA_PORT);
+		outb(dflip, COMMAND_PORT);
+	}
+	de620_send_command(dev,W_DUMMY);
+#endif /* LOWSPEED */
+}
+
+static inline void
+de620_read_block(struct net_device *dev, byte *data, int count)
+{
+#ifndef LOWSPEED
+	byte value;
+	byte uflip = NIC_Cmd ^ (DS0 | DS1);
+	byte dflip = NIC_Cmd;
+#else /* LOWSPEED */
+#ifdef COUNT_LOOPS
+	int bytes = count;
+
+	tot_cnt = 0;
+#endif /* COUNT_LOOPS */
+#endif /* LOWSPEED */
+
+#ifdef LOWSPEED
+	/* No further optimization useful, the limit is in the adapter. */
+	while (count-- > 0) {
+		*data++ = de620_read_byte(dev);
+		de620_flip_ds(dev);
+	}
+#ifdef COUNT_LOOPS
+	/* trial debug output: loops per byte in de620_ready() */
+	printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
+#endif /* COUNT_LOOPS */
+#else /* not LOWSPEED */
+	while (count-- > 0) {
+		value = inb(STATUS_PORT) & 0xf0; /* High nibble */
+		outb(uflip, COMMAND_PORT);
+		*data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
+		outb(dflip , COMMAND_PORT);
+	}
+#endif /* LOWSPEED */
+}
+
+static inline void
+de620_set_delay(struct net_device *dev)
+{
+	de620_ready(dev);
+	outb(W_DFR, DATA_PORT);
+	outb(NIC_Cmd ^ CS0, COMMAND_PORT);
+
+	de620_ready(dev);
+#ifdef LOWSPEED
+	outb(WRITE_DELAY, DATA_PORT);
+#else
+	outb(0, DATA_PORT);
+#endif
+	de620_flip_ds(dev);
+
+	de620_ready(dev);
+#ifdef LOWSPEED
+	outb(READ_DELAY, DATA_PORT);
+#else
+	outb(0, DATA_PORT);
+#endif
+	de620_flip_ds(dev);
+}
+
+static inline void
+de620_set_register(struct net_device *dev, byte reg, byte value)
+{
+	de620_ready(dev);
+	outb(reg, DATA_PORT);
+	outb(NIC_Cmd ^ CS0, COMMAND_PORT);
+
+	de620_put_byte(dev, value);
+}
+
+static inline byte
+de620_get_register(struct net_device *dev, byte reg)
+{
+	byte value;
+
+	de620_send_command(dev,reg);
+	value = de620_read_byte(dev);
+	de620_send_command(dev,W_DUMMY);
+
+	return value;
+}
+
+/*********************************************************************
+ *
+ * Open/initialize the board.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is a non-reboot way to recover if something goes wrong.
+ *
+ */
+static int de620_open(struct net_device *dev)
+{
+	int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
+	if (ret) {
+		printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
+		return ret;
+	}
+
+	if (adapter_init(dev)) {
+		ret = -EIO;
+		goto out_free_irq;
+	}
+
+	netif_start_queue(dev);
+	return 0;
+
+out_free_irq:
+	free_irq(dev->irq, dev);
+	return ret;
+}
+
+/************************************************
+ *
+ * The inverse routine to de620_open().
+ *
+ */
+
+static int de620_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	/* disable recv */
+	de620_set_register(dev, W_TCR, RXOFF);
+	free_irq(dev->irq, dev);
+	return 0;
+}
+
+/*********************************************
+ *
+ * Return current statistics
+ *
+ */
+static struct net_device_stats *get_stats(struct net_device *dev)
+{
+	return (struct net_device_stats *)(dev->priv);
+}
+
+/*********************************************
+ *
+ * Set or clear the multicast filter for this adaptor.
+ * (no real multicast implemented for the DE-620, but she can be promiscuous...)
+ *
+ */
+
+static void de620_set_multicast_list(struct net_device *dev)
+{
+	if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
+	{ /* Enable promiscuous mode */
+		/*
+		 *	We must make the kernel realise we had to move
+		 *	into promisc mode or we start all out war on
+		 *	the cable. - AC
+		 */
+		dev->flags|=IFF_PROMISC;
+
+		de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
+	}
+	else
+	{ /* Disable promiscuous mode, use normal mode */
+		de620_set_register(dev, W_TCR, TCR_DEF);
+	}
+}
+
+/*******************************************************
+ *	
+ * Handle timeouts on transmit
+ */
+ 
+static void de620_timeout(struct net_device *dev)
+{
+	printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
+	/* Restart the adapter. */
+	if (!adapter_init(dev)) /* maybe close it */
+		netif_wake_queue(dev);
+}
+
+/*******************************************************
+ *
+ * Copy a buffer to the adapter transmit page memory.
+ * Start sending.
+ */
+static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned long flags;
+	int len;
+	byte *buffer = skb->data;
+	byte using_txbuf;
+
+	using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
+	
+	netif_stop_queue(dev);
+	
+
+	if ((len = skb->len) < RUNT)
+		len = RUNT;
+	if (len & 1) /* send an even number of bytes */
+		++len;
+
+	/* Start real output */
+
+	spin_lock_irqsave(&de620_lock, flags)
+	PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
+		(int)skb->len, using_txbuf));
+
+	/* select a free tx buffer. if there is one... */
+	switch (using_txbuf) {
+	default: /* both are free: use TXBF0 */
+	case TXBF1: /* use TXBF0 */
+		de620_send_command(dev,W_CR | RW0);
+		using_txbuf |= TXBF0;
+		break;
+
+	case TXBF0: /* use TXBF1 */
+		de620_send_command(dev,W_CR | RW1);
+		using_txbuf |= TXBF1;
+		break;
+
+	case (TXBF0 | TXBF1): /* NONE!!! */
+		printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
+		spin_unlock_irqrestore(&de620_lock, flags);
+		return 1;
+	}
+	de620_write_block(dev, buffer, skb->len, len-skb->len);
+
+	dev->trans_start = jiffies;
+	if(!(using_txbuf == (TXBF0 | TXBF1)))
+		netif_wake_queue(dev);
+
+	((struct net_device_stats *)(dev->priv))->tx_packets++;
+	spin_unlock_irqrestore(&de620_lock, flags);
+	dev_kfree_skb (skb);
+	return 0;
+}
+
+/*****************************************************
+ *
+ * Handle the network interface interrupts.
+ *
+ */
+static irqreturn_t
+de620_interrupt(int irq_in, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	byte irq_status;
+	int bogus_count = 0;
+	int again = 0;
+
+	spin_lock(&de620_lock);
+	
+	/* Read the status register (_not_ the status port) */
+	irq_status = de620_get_register(dev, R_STS);
+
+	PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
+
+	if (irq_status & RXGOOD) {
+		do {
+			again = de620_rx_intr(dev);
+			PRINTK(("again=%d\n", again));
+		}
+		while (again && (++bogus_count < 100));
+	}
+
+	if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
+		netif_wake_queue(dev);
+		
+	spin_unlock(&de620_lock);
+	return IRQ_HANDLED;
+}
+
+/**************************************
+ *
+ * Get a packet from the adapter
+ *
+ * Send it "upstairs"
+ *
+ */
+static int de620_rx_intr(struct net_device *dev)
+{
+	struct header_buf {
+		byte		status;
+		byte		Rx_NextPage;
+		unsigned short	Rx_ByteCount;
+	} header_buf;
+	struct sk_buff *skb;
+	int size;
+	byte *buffer;
+	byte pagelink;
+	byte curr_page;
+
+	PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
+
+	/* Tell the adapter that we are going to read data, and from where */
+	de620_send_command(dev, W_CR | RRN);
+	de620_set_register(dev, W_RSA1, next_rx_page);
+	de620_set_register(dev, W_RSA0, 0);
+
+	/* Deep breath, and away we goooooo */
+	de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
+	PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
+	header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
+
+	/* Plausible page header? */
+	pagelink = header_buf.Rx_NextPage;
+	if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
+		/* Ouch... Forget it! Skip all and start afresh... */
+		printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
+		/* You win some, you lose some. And sometimes plenty... */
+		adapter_init(dev);
+		netif_wake_queue(dev);
+		((struct net_device_stats *)(dev->priv))->rx_over_errors++;
+		return 0;
+	}
+
+	/* OK, this look good, so far. Let's see if it's consistent... */
+	/* Let's compute the start of the next packet, based on where we are */
+	pagelink = next_rx_page +
+		((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
+
+	/* Are we going to wrap around the page counter? */
+	if (pagelink > last_rx_page)
+		pagelink -= (last_rx_page - first_rx_page + 1);
+
+	/* Is the _computed_ next page number equal to what the adapter says? */
+	if (pagelink != header_buf.Rx_NextPage) {
+		/* Naah, we'll skip this packet. Probably bogus data as well */
+		printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
+		next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
+		de620_send_command(dev, W_DUMMY);
+		de620_set_register(dev, W_NPRF, next_rx_page);
+		((struct net_device_stats *)(dev->priv))->rx_over_errors++;
+		return 0;
+	}
+	next_rx_page = pagelink;
+
+	size = header_buf.Rx_ByteCount - 4;
+	if ((size < RUNT) || (GIANT < size)) {
+		printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
+	}
+	else { /* Good packet? */
+		skb = dev_alloc_skb(size+2);
+		if (skb == NULL) { /* Yeah, but no place to put it... */
+			printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
+			((struct net_device_stats *)(dev->priv))->rx_dropped++;
+		}
+		else { /* Yep! Go get it! */
+			skb_reserve(skb,2);	/* Align */
+			skb->dev = dev;
+			/* skb->data points to the start of sk_buff data area */
+			buffer = skb_put(skb,size);
+			/* copy the packet into the buffer */
+			de620_read_block(dev, buffer, size);
+			PRINTK(("Read %d bytes\n", size));
+			skb->protocol=eth_type_trans(skb,dev);
+			netif_rx(skb); /* deliver it "upstairs" */
+			dev->last_rx = jiffies;
+			/* count all receives */
+			((struct net_device_stats *)(dev->priv))->rx_packets++;
+			((struct net_device_stats *)(dev->priv))->rx_bytes += size;
+		}
+	}
+
+	/* Let's peek ahead to see if we have read the last current packet */
+	/* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
+	curr_page = de620_get_register(dev, R_CPR);
+	de620_set_register(dev, W_NPRF, next_rx_page);
+	PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
+
+	return (next_rx_page != curr_page); /* That was slightly tricky... */
+}
+
+/*********************************************
+ *
+ * Reset the adapter to a known state
+ *
+ */
+static int adapter_init(struct net_device *dev)
+{
+	int i;
+	static int was_down;
+
+	if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
+		EIPRegister = NCTL0;
+		if (nic_data.Media != 1)
+			EIPRegister |= NIS0;	/* not BNC */
+	}
+	else if (nic_data.Model == 2) { /* UTP */
+		EIPRegister = NCTL0 | NIS0;
+	}
+
+	if (utp)
+		EIPRegister = NCTL0 | NIS0;
+	if (bnc)
+		EIPRegister = NCTL0;
+
+	de620_send_command(dev, W_CR | RNOP | CLEAR);
+	de620_send_command(dev, W_CR | RNOP);
+
+	de620_set_register(dev, W_SCR, SCR_DEF);
+	/* disable recv to wait init */
+	de620_set_register(dev, W_TCR, RXOFF);
+
+	/* Set the node ID in the adapter */
+	for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
+		de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
+	}
+
+	de620_set_register(dev, W_EIP, EIPRegister);
+
+	next_rx_page = first_rx_page = DE620_RX_START_PAGE;
+	if (nic_data.RAM_Size)
+		last_rx_page = nic_data.RAM_Size - 1;
+	else /* 64k RAM */
+		last_rx_page = 255;
+
+	de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
+	de620_set_register(dev, W_EPR, last_rx_page);  /* End Page Register */
+	de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
+	de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
+	de620_send_command(dev, W_DUMMY);
+	de620_set_delay(dev);
+
+	/* Final sanity check: Anybody out there? */
+	/* Let's hope some bits from the statusregister make a good check */
+#define CHECK_MASK (  0 | TXSUC |  T16  |  0  | RXCRC | RXSHORT |  0  |  0  )
+#define CHECK_OK   (  0 |   0   |  0    |  0  |   0   |   0     |  0  |  0  )
+        /* success:   X     0      0       X      0       0        X     X  */
+        /* ignore:   EEDI                RXGOOD                   COLS  LNKS*/
+
+	if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
+		printk(KERN_ERR "%s: Something has happened to the DE-620!  Please check it"
+#ifdef SHUTDOWN_WHEN_LOST
+			" and do a new ifconfig"
+#endif
+			"! (%02x)\n", dev->name, i);
+#ifdef SHUTDOWN_WHEN_LOST
+		/* Goodbye, cruel world... */
+		dev->flags &= ~IFF_UP;
+		de620_close(dev);
+#endif
+		was_down = 1;
+		return 1; /* failed */
+	}
+	if (was_down) {
+		printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
+		was_down = 0;
+	}
+
+	/* All OK, go ahead... */
+	de620_set_register(dev, W_TCR, TCR_DEF);
+
+	return 0; /* all ok */
+}
+
+/******************************************************************************
+ *
+ * Only start-up code below
+ *
+ */
+/****************************************
+ *
+ * Check if there is a DE-620 connected
+ */
+struct net_device * __init de620_probe(int unit)
+{
+	byte checkbyte = 0xa5;
+	struct net_device *dev;
+	int err = -ENOMEM;
+	int i;
+
+	dev = alloc_etherdev(sizeof(struct net_device_stats));
+	if (!dev)
+		goto out;
+
+	SET_MODULE_OWNER(dev);
+
+	spin_lock_init(&de620_lock);
+	
+	/*
+	 * This is where the base_addr and irq gets set.
+	 * Tunable at compile-time and insmod-time
+	 */
+	dev->base_addr = io;
+	dev->irq       = irq;
+
+	/* allow overriding parameters on command line */
+	if (unit >= 0) {
+		sprintf(dev->name, "eth%d", unit);
+		netdev_boot_setup_check(dev);
+	}
+	
+	if (de620_debug)
+		printk(version);
+
+	printk(KERN_INFO "D-Link DE-620 pocket adapter");
+
+	if (!request_region(dev->base_addr, 3, "de620")) {
+		printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
+		err = -EBUSY;
+		goto out1;
+	}
+
+	/* Initially, configure basic nibble mode, so we can read the EEPROM */
+	NIC_Cmd = DEF_NIC_CMD;
+	de620_set_register(dev, W_EIP, EIPRegister);
+
+	/* Anybody out there? */
+	de620_set_register(dev, W_CPR, checkbyte);
+	checkbyte = de620_get_register(dev, R_CPR);
+
+	if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
+		printk(" not identified in the printer port\n");
+		err = -ENODEV;
+		goto out2;
+	}
+
+	/* else, got it! */
+	printk(", Ethernet Address: %2.2X",
+		dev->dev_addr[0] = nic_data.NodeID[0]);
+	for (i = 1; i < ETH_ALEN; i++) {
+		printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
+		dev->broadcast[i] = 0xff;
+	}
+
+	printk(" (%dk RAM,",
+		(nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
+
+	if (nic_data.Media == 1)
+		printk(" BNC)\n");
+	else
+		printk(" UTP)\n");
+
+	dev->get_stats 		= get_stats;
+	dev->open 		= de620_open;
+	dev->stop 		= de620_close;
+	dev->hard_start_xmit 	= de620_start_xmit;
+	dev->tx_timeout 	= de620_timeout;
+	dev->watchdog_timeo	= HZ*2;
+	dev->set_multicast_list = de620_set_multicast_list;
+	
+	/* base_addr and irq are already set, see above! */
+
+	/* dump eeprom */
+	if (de620_debug) {
+		printk("\nEEPROM contents:\n");
+		printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
+		printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
+			nic_data.NodeID[0], nic_data.NodeID[1],
+			nic_data.NodeID[2], nic_data.NodeID[3],
+			nic_data.NodeID[4], nic_data.NodeID[5]);
+		printk("Model = %d\n", nic_data.Model);
+		printk("Media = %d\n", nic_data.Media);
+		printk("SCR = 0x%02x\n", nic_data.SCR);
+	}
+
+	err = register_netdev(dev);
+	if (err)
+		goto out2;
+	return dev;
+
+out2:
+	release_region(dev->base_addr, 3);
+out1:
+	free_netdev(dev);
+out:
+	return ERR_PTR(err);
+}
+
+/**********************************
+ *
+ * Read info from on-board EEPROM
+ *
+ * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
+ */
+#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
+
+static unsigned short __init ReadAWord(struct net_device *dev, int from)
+{
+	unsigned short data;
+	int nbits;
+
+	/* cs   [__~~] SET SEND STATE */
+	/* di   [____]                */
+	/* sck  [_~~_]                */
+	sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
+
+	/* Send the 9-bit address from where we want to read the 16-bit word */
+	for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
+		if (from & 0x0100) { /* bit set? */
+			/* cs    [~~~~] SEND 1 */
+			/* di    [~~~~]        */
+			/* sck   [_~~_]        */
+			sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
+		}
+		else {
+			/* cs    [~~~~] SEND 0 */
+			/* di    [____]        */
+			/* sck   [_~~_]        */
+			sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
+		}
+	}
+
+	/* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
+	for (data = 0, nbits = 16; nbits > 0; --nbits) {
+		/* cs    [~~~~] SEND 0 */
+		/* di    [____]        */
+		/* sck   [_~~_]        */
+		sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
+		data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
+	}
+	/* cs    [____] RESET SEND STATE */
+	/* di    [____]                  */
+	/* sck   [_~~_]                  */
+	sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
+
+	return data;
+}
+
+static int __init read_eeprom(struct net_device *dev)
+{
+	unsigned short wrd;
+
+	/* D-Link Ethernet addresses are in the series  00:80:c8:7X:XX:XX:XX */
+	wrd = ReadAWord(dev, 0x1aa);	/* bytes 0 + 1 of NodeID */
+	if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
+		return -1; /* Nope, not a DE-620 */
+	nic_data.NodeID[0] = wrd & 0xff;
+	nic_data.NodeID[1] = wrd >> 8;
+
+	wrd = ReadAWord(dev, 0x1ab);	/* bytes 2 + 3 of NodeID */
+	if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
+		return -1; /* Nope, not a DE-620 */
+	nic_data.NodeID[2] = wrd & 0xff;
+	nic_data.NodeID[3] = wrd >> 8;
+
+	wrd = ReadAWord(dev, 0x1ac);	/* bytes 4 + 5 of NodeID */
+	nic_data.NodeID[4] = wrd & 0xff;
+	nic_data.NodeID[5] = wrd >> 8;
+
+	wrd = ReadAWord(dev, 0x1ad);	/* RAM size in pages (256 bytes). 0 = 64k */
+	nic_data.RAM_Size = (wrd >> 8);
+
+	wrd = ReadAWord(dev, 0x1ae);	/* hardware model (CT = 3) */
+	nic_data.Model = (wrd & 0xff);
+
+	wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
+	nic_data.Media = (wrd & 0xff);
+
+	wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
+	nic_data.SCR = (wrd >> 8);
+
+	return 0; /* no errors */
+}
+
+/******************************************************************************
+ *
+ * Loadable module skeleton
+ *
+ */
+#ifdef MODULE
+static struct net_device *de620_dev;
+
+int init_module(void)
+{
+	de620_dev = de620_probe(-1);
+	if (IS_ERR(de620_dev))
+		return PTR_ERR(de620_dev);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	unregister_netdev(de620_dev);
+	release_region(de620_dev->base_addr, 3);
+	free_netdev(de620_dev);
+}
+#endif /* MODULE */
+MODULE_LICENSE("GPL");
+
+
+/*
+ * (add '-DMODULE' when compiling as loadable module)
+ *
+ * compile-command:
+ *	gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
+ *	 -fomit-frame-pointer -m486 \
+ *	-I/usr/src/linux/include -I../../net/inet -c de620.c
+*/
+/*
+ * Local variables:
+ *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ * End:
+ */