2006-01-22 Thomas Schwinge <tschwinge@gnu.org>

* configure, i386/configure, i386/linux/configure, linux/configure,
	i386/linux/device-drivers.h.in: Regenerated.

	* linux/src/drivers/net/ne2k-pci.c: Resolve conflicts.

2006-01-22  Guillem Jover  <guillem@hadrons.org>

	* i386/linux/configure.ac: Renamed winbond-840 driver to winbond_840.
	Enable the starfire, intel_gige and natsemi network drivers.  Remove
	"CONFIG_" from cb_chim, starfire, sundance, winbond840, hamachi,
	natsemi, myson803 and ns820 driver declarations.  Replace INTER_GIGE
	with INTEL_GIGE.
	* linux/dev/drivers/net/Space.c: Add conditional probes for natsemi,
	ns820, winbond840, hamachi, sundance, starfire, myson803 and intel-gige
	drivers.

	* linux/src/include/asm-i386/cache.h: New file from linux 2.2.26.
	* linux/dev/include/linux/malloc.h: Include <asm/cache.h>.

	* linux/src/drivers/net/ns820.c (netsami_drv_id): Renamed to ...
	(ns820_drv_id): ... this.  Fix all callers.
	* linux/src/drivers/net/intel-gige.c
	(skel_netdev_probe): Renamed to ...
	(igige_probe): ... this.
	* linux/dev/drivers/net/eepro100.c: Remove obsoleted file.
	* linux/src/drivers/net/eepro100.c (pci_id_tbl): Add PCI ID's from
	linux-2.6.14-rc4.

2006-01-22  Alfred M. Szmidt  <ams@gnu.org>

	* i386/linux/configure.ac: Added `pci-scan.o' to the network driver
	class.  (ns820, myson803, sundance, winbond-840, hamachi): New drivers.
	* i386/linux/Makefile.in (linux-net-files): Added `cb_shim.c',
	`hamachi.c', `intel-gige.c', `myson803.c', `natsemi.c', `ns820.c',
	`starfire.c', `sundance.c', `winbond-840.c' and `pci-scan.c'.

	* linux/dev/include/linux/modversions.h: New file.

	* linux/src/drivers/net/cb_shim.c, linux/src/drivers/net/hamachi.c,
	linux/src/drivers/net/intel-gige.c, linux/src/drivers/net/myson803.c,
	linux/src/drivers/net/natsemi.c, linux/src/drivers/net/ns820.c,
	linux/src/drivers/net/starfire.c, linux/src/drivers/net/sundance.c,
	linux/src/drivers/net/winbond-840.c,
	linux/src/drivers/net/kern_compat.h, linux/src/drivers/net/pci-scan.c,
	linux/src/drivers/net/pci-scan.h: New files from netdrivers 3.5 package
	(http://www.scyld.com/network).

	* linux/src/drivers/net/3c59x.c, linux/src/drivers/net/eepro100.c,
	linux/src/drivers/net/epic100.c, linux/src/drivers/net/ne2k-pci.c,
	linux/src/drivers/net/rtl8139.c, linux/src/drivers/net/tulip.c,
	linux/src/drivers/net/via-rhine.c, linux/src/drivers/net/yellowfin.c:
	Updated files from netdrivers 3.5 (http://www.scyld.com/network).

1 files changed, 1547 insertions, 0 deletions

diff --git a/linux/src/drivers/net/ns820.c b/linux/src/drivers/net/ns820.c
new file mode 100644
index 0000000..968f3ac
--- /dev/null
+++ b/linux/src/drivers/net/ns820.c
@@ -0,0 +1,1547 @@
+/* ns820.c: A Linux Gigabit Ethernet driver for the NatSemi DP83820 series. */
+/*
+	Written/copyright 1999-2003 by Donald Becker.
+	Copyright 2002-2003 by Scyld Computing Corporation.
+
+	This software may be used and distributed according to the terms of
+	the GNU General Public License (GPL), incorporated herein by reference.
+	Drivers based on or derived from this code fall under the GPL and must
+	retain the authorship, copyright and license notice.  This file is not
+	a complete program and may only be used when the entire operating
+	system is licensed under the GPL.  License for under other terms may be
+	available.  Contact the original author for details.
+
+	The original author may be reached as becker@scyld.com, or at
+	Scyld Computing Corporation
+	914 Bay Ridge Road, Suite 220
+	Annapolis MD 21403
+
+	Support information and updates available at
+		http://www.scyld.com/network/natsemi.html
+	The information and support mailing lists are based at
+		http://www.scyld.com/mailman/listinfo/
+*/
+
+/* These identify the driver base version and may not be removed. */
+static const char version1[] =
+"ns820.c:v1.03a 8/09/2003  Written by Donald Becker <becker@scyld.com>\n";
+static const char version2[] =
+"  http://www.scyld.com/network/natsemi.html\n";
+/* Updated to recommendations in pci-skeleton v2.13. */
+
+/* Automatically extracted configuration info:
+probe-func: ns820_probe
+config-in: tristate 'National Semiconductor DP8382x series PCI Ethernet support' CONFIG_NATSEMI820
+
+c-help-name: National Semiconductor DP8382x series PCI Ethernet support
+c-help-symbol: CONFIG_NATSEMI820
+c-help: This driver is for the National Semiconductor DP83820 Gigabit Ethernet
+c-help: adapter series.
+c-help: More specific information and updates are available from
+c-help: http://www.scyld.com/network/natsemi.html
+*/
+
+/* The user-configurable values.
+   These may be modified when a driver module is loaded.*/
+
+/* Message enable level: 0..31 = no..all messages.  See NETIF_MSG docs. */
+static int debug = 2;
+
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 20;
+
+/* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
+   This chip uses a 2048 element hash table based on the Ethernet CRC.
+   Previous natsemi chips had unreliable multicast filter circuitry.
+   To work around an observed problem set this value to '0',
+   which will immediately switch to Rx-all-multicast.
+  */
+static int multicast_filter_limit = 100;
+
+/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
+   Setting to > 1518 effectively disables this feature.
+   This chip can only receive into aligned buffers, so architectures such
+   as the Alpha AXP might benefit from a copy-align.
+*/
+static int rx_copybreak = 0;
+
+/* Used to pass the media type, etc.
+   Both 'options[]' and 'full_duplex[]' should exist for driver
+   interoperability, however setting full_duplex[] is deprecated.
+   The media type is usually passed in 'options[]'.
+    The default is autonegotation for speed and duplex.
+	This should rarely be overridden.
+    Use option values 0x10/0x20 for 10Mbps, 0x100,0x200 for 100Mbps.
+    Use option values 0x10 and 0x100 for forcing half duplex fixed speed.
+    Use option values 0x20 and 0x200 for forcing full duplex operation.
+	Use 0x1000 or 0x2000 for gigabit.
+*/
+#define MAX_UNITS 8		/* More are supported, limit only on options */
+static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+/* Operational parameters that are set at compile time. */
+
+/* Keep the ring sizes a power of two for compile efficiency.
+   Understand the implications before changing these settings!
+   The compiler will convert <unsigned>'%'<2^N> into a bit mask.
+   Making the Tx ring too large decreases the effectiveness of channel
+   bonding and packet priority, confuses the system network buffer limits,
+   and wastes memory.
+   Too-large receive rings waste memory and confound network buffer limits.
+*/
+#define TX_RING_SIZE	16
+#define TX_QUEUE_LEN	10		/* Limit ring entries actually used, min 4. */
+#define RX_RING_SIZE	64
+
+/* Operational parameters that usually are not changed. */
+/* Time in jiffies before concluding the transmitter is hung.
+   Re-autonegotiation may take up to 3 seconds.
+ */
+#define TX_TIMEOUT  (6*HZ)
+
+/* Allocation size of Rx buffers with normal sized Ethernet frames.
+   Do not change this value without good reason.  This is not a limit,
+   but a way to keep a consistent allocation size among drivers.
+ */
+#define PKT_BUF_SZ		1536
+
+#ifndef __KERNEL__
+#define __KERNEL__
+#endif
+#if !defined(__OPTIMIZE__)
+#warning  You must compile this file with the correct options!
+#warning  See the last lines of the source file.
+#error You must compile this driver with "-O".
+#endif
+
+/* Include files, designed to support most kernel versions 2.0.0 and later. */
+#include <linux/config.h>
+#if defined(CONFIG_SMP) && ! defined(__SMP__)
+#define __SMP__
+#endif
+#if defined(MODULE) && defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
+#define MODVERSIONS
+#endif
+
+#include <linux/version.h>
+#if defined(MODVERSIONS)
+#include <linux/modversions.h>
+#endif
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#if LINUX_VERSION_CODE >= 0x20400
+#include <linux/slab.h>
+#else
+#include <linux/malloc.h>
+#endif
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <asm/processor.h>		/* Processor type for cache alignment. */
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#ifdef INLINE_PCISCAN
+#include "k_compat.h"
+#else
+#include "pci-scan.h"
+#include "kern_compat.h"
+#endif
+
+#if (LINUX_VERSION_CODE >= 0x20100)  &&  defined(MODULE)
+char kernel_version[] = UTS_RELEASE;
+#endif
+
+MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
+MODULE_DESCRIPTION("National Semiconductor DP83820 series PCI Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(debug, "i");
+MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
+MODULE_PARM(max_interrupt_work, "i");
+MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
+MODULE_PARM(rx_copybreak, "i");
+MODULE_PARM(multicast_filter_limit, "i");
+MODULE_PARM_DESC(debug, "Driver message level (0-31)");
+MODULE_PARM_DESC(options, "Force transceiver type or fixed speed+duplex");
+MODULE_PARM_DESC(max_interrupt_work,
+				 "Driver maximum events handled per interrupt");
+MODULE_PARM_DESC(full_duplex,
+				 "Non-zero to force full duplex, non-negotiated link "
+				 "(deprecated).");
+MODULE_PARM_DESC(rx_copybreak,
+				 "Breakpoint in bytes for copy-only-tiny-frames");
+MODULE_PARM_DESC(multicast_filter_limit,
+				 "Multicast addresses before switching to Rx-all-multicast");
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This driver is designed for National Semiconductor DP83820 10/100/1000
+Ethernet NIC.  It is superficially similar to the 810 series "natsemi.c"
+driver, however the register layout, descriptor layout and element
+length of the new chip series is different.
+
+II. Board-specific settings
+
+This driver requires the PCI interrupt line to be configured.
+It honors the EEPROM-set values.
+
+III. Driver operation
+
+IIIa. Ring buffers
+
+This driver uses two statically allocated fixed-size descriptor lists
+formed into rings by a branch from the final descriptor to the beginning of
+the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
+The NatSemi design uses a 'next descriptor' pointer that the driver forms
+into a list, thus rings can be arbitrarily sized.  Before changing the
+ring sizes you should understand the flow and cache effects of the
+full/available/empty hysteresis.
+
+IIIb/c. Transmit/Receive Structure
+
+This driver uses a zero-copy receive and transmit scheme.
+The driver allocates full frame size skbuffs for the Rx ring buffers at
+open() time and passes the skb->data field to the chip as receive data
+buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
+a fresh skbuff is allocated and the frame is copied to the new skbuff.
+When the incoming frame is larger, the skbuff is passed directly up the
+protocol stack.  Buffers consumed this way are replaced by newly allocated
+skbuffs in a later phase of receives.
+
+The RX_COPYBREAK value is chosen to trade-off the memory wasted by
+using a full-sized skbuff for small frames vs. the copying costs of larger
+frames.  New boards are typically used in generously configured machines
+and the underfilled buffers have negligible impact compared to the benefit of
+a single allocation size, so the default value of zero results in never
+copying packets.  When copying is done, the cost is usually mitigated by using
+a combined copy/checksum routine.  Copying also preloads the cache, which is
+most useful with small frames.
+
+A subtle aspect of the operation is that unaligned buffers are not permitted
+by the hardware.  Thus the IP header at offset 14 in an ethernet frame isn't
+longword aligned for further processing.  On copies frames are put into the
+skbuff at an offset of "+2", 16-byte aligning the IP header.
+
+IIId. Synchronization
+
+The driver runs as two independent, single-threaded flows of control.  One
+is the send-packet routine, which enforces single-threaded use by the
+dev->tbusy flag.  The other thread is the interrupt handler, which is single
+threaded by the hardware and interrupt handling software.
+
+The send packet thread has partial control over the Tx ring and 'dev->tbusy'
+flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
+queue slot is empty, it clears the tbusy flag when finished otherwise it sets
+the 'lp->tx_full' flag.
+
+The interrupt handler has exclusive control over the Rx ring and records stats
+from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
+empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
+clears both the tx_full and tbusy flags.
+
+IV. Notes
+
+The NatSemi 820 series PCI gigabit chips are very common on low-cost NICs.
+The '821 appears to be the same as '820 chip, only with pins for the upper
+32 bits marked "N/C".
+
+IVb. References
+
+http://www.scyld.com/expert/100mbps.html
+http://www.scyld.com/expert/NWay.html
+The NatSemi dp83820 datasheet is available: search www.natsemi.com
+
+IVc. Errata
+
+None characterised.
+
+*/
+
+
+
+static void *ns820_probe1(struct pci_dev *pdev, void *init_dev,
+							long ioaddr, int irq, int chip_idx, int find_cnt);
+static int power_event(void *dev_instance, int event);
+enum chip_capability_flags {FDXActiveLow=1, InvertGbXcvrPwr=2, };
+#ifdef USE_IO_OPS
+#define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_IO  | PCI_ADDR0)
+#else
+#define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_MEM | PCI_ADDR1)
+#endif
+
+static struct pci_id_info pci_id_tbl[] = {
+	{ "D-Link DGE-500T (DP83820)",
+	  { 0x0022100B, 0xffffffff, 0x49001186, 0xffffffff, },
+	  PCI_IOTYPE, 256, FDXActiveLow},
+	{"NatSemi DP83820", { 0x0022100B, 0xffffffff },
+	 PCI_IOTYPE, 256, 0},
+	{0,},						/* 0 terminated list. */
+};
+
+struct drv_id_info ns820_drv_id = {
+	"ns820", PCI_HOTSWAP, PCI_CLASS_NETWORK_ETHERNET<<8, pci_id_tbl,
+	ns820_probe1, power_event };
+
+/* Offsets to the device registers.
+   Unlike software-only systems, device drivers interact with complex hardware.
+   It's not useful to define symbolic names for every register bit in the
+   device.  Please do not change these names without good reason.
+*/
+enum register_offsets {
+	ChipCmd=0x00, ChipConfig=0x04, EECtrl=0x08, PCIBusCfg=0x0C,
+	IntrStatus=0x10, IntrMask=0x14, IntrEnable=0x18, IntrHoldoff=0x1C,
+	TxRingPtr=0x20, TxRingPtrHi=0x24, TxConfig=0x28,
+	RxRingPtr=0x30, RxRingPtrHi=0x34, RxConfig=0x38,
+	WOLCmd=0x40, PauseCmd=0x44, RxFilterAddr=0x48, RxFilterData=0x4C,
+	BootRomAddr=0x50, BootRomData=0x54, ChipRevReg=0x58,
+	StatsCtrl=0x5C, RxPktErrs=0x60, RxMissed=0x68, RxCRCErrs=0x64,
+};
+
+/* Bits in ChipCmd. */
+enum ChipCmdBits {
+	ChipReset=0x100, SoftIntr=0x80, RxReset=0x20, TxReset=0x10,
+	RxOff=0x08, RxOn=0x04, TxOff=0x02, TxOn=0x01,
+};
+
+/* Bits in ChipConfig. */
+enum ChipConfigBits {
+	CfgLinkGood=0x80000000, CfgFDX=0x10000000,
+	CfgXcrReset=0x0400, CfgXcrOff=0x0200,
+};
+
+/* Bits in the interrupt status/mask registers. */
+enum intr_status_bits {
+	IntrRxDone=0x0001, IntrRxIntr=0x0002, IntrRxErr=0x0004, IntrRxEarly=0x0008,
+	IntrRxIdle=0x0010, IntrRxOverrun=0x0020,
+	IntrTxDone=0x0040, IntrTxIntr=0x0080, IntrTxErr=0x0100,
+	IntrTxIdle=0x0200, IntrTxUnderrun=0x0400,
+	StatsMax=0x0800, IntrDrv=0x1000, WOLPkt=0x2000, LinkChange=0x4000,
+	RxStatusOverrun=0x10000,
+	RxResetDone=0x00200000, TxResetDone=0x00400000,
+	IntrPCIErr=0x001E0000,
+	IntrNormalSummary=0x0251, IntrAbnormalSummary=0xED20,
+};
+
+/* Bits in the RxMode register. */
+enum rx_mode_bits {
+	AcceptErr=0x20, AcceptRunt=0x10,
+	AcceptBroadcast=0xC0000000,
+	AcceptMulticast=0x00200000, AcceptAllMulticast=0x20000000,
+	AcceptAllPhys=0x10000000, AcceptMyPhys=0x08000000,
+};
+
+/* The Rx and Tx buffer descriptors. */
+/* Note that using only 32 bit fields simplifies conversion to big-endian
+   architectures. */
+struct netdev_desc {
+#if ADDRLEN == 64
+	u64 next_desc;
+	u64 buf_addr;
+#endif
+	u32 next_desc;
+	u32 buf_addr;
+	s32 cmd_status;
+	u32 vlan_status;
+};
+
+/* Bits in network_desc.status */
+enum desc_status_bits {
+	DescOwn=0x80000000, DescMore=0x40000000, DescIntr=0x20000000,
+	DescNoCRC=0x10000000,
+	DescPktOK=0x08000000, RxTooLong=0x00400000,
+};
+
+#define PRIV_ALIGN	15	/* Required alignment mask */
+struct netdev_private {
+	/* Descriptor rings first for alignment. */
+	struct netdev_desc rx_ring[RX_RING_SIZE];
+	struct netdev_desc tx_ring[TX_RING_SIZE];
+	struct net_device *next_module;		/* Link for devices of this type. */
+	void *priv_addr;					/* Unaligned address for kfree */
+	const char *product_name;
+	/* The addresses of receive-in-place skbuffs. */
+	struct sk_buff* rx_skbuff[RX_RING_SIZE];
+	/* The saved address of a sent-in-place packet/buffer, for later free(). */
+	struct sk_buff* tx_skbuff[TX_RING_SIZE];
+	struct net_device_stats stats;
+	struct timer_list timer;	/* Media monitoring timer. */
+	/* Frequently used values: keep some adjacent for cache effect. */
+	int msg_level;
+	int chip_id, drv_flags;
+	struct pci_dev *pci_dev;
+	long in_interrupt;			/* Word-long for SMP locks. */
+	int max_interrupt_work;
+	int intr_enable;
+	unsigned int restore_intr_enable:1;	/* Set if temporarily masked.  */
+	unsigned int rx_q_empty:1;			/* Set out-of-skbuffs.  */
+
+	struct netdev_desc *rx_head_desc;
+	unsigned int cur_rx, dirty_rx;		/* Producer/consumer ring indices */
+	unsigned int rx_buf_sz;				/* Based on MTU+slack. */
+	int rx_copybreak;
+
+	unsigned int cur_tx, dirty_tx;
+	unsigned int tx_full:1;				/* The Tx queue is full. */
+	/* These values keep track of the transceiver/media in use. */
+	unsigned int full_duplex:1;			/* Full-duplex operation requested. */
+	unsigned int duplex_lock:1;
+	unsigned int medialock:1;			/* Do not sense media. */
+	unsigned int default_port;			/* Last dev->if_port value. */
+	/* Rx filter. */
+	u32 cur_rx_mode;
+	u32 rx_filter[16];
+	int multicast_filter_limit;
+	/* FIFO and PCI burst thresholds. */
+	int tx_config, rx_config;
+	/* MII transceiver section. */
+	u16 advertising;					/* NWay media advertisement */
+};
+
+static int  eeprom_read(long ioaddr, int location);
+static void mdio_sync(long mdio_addr);
+static int  mdio_read(struct net_device *dev, int phy_id, int location);
+static void mdio_write(struct net_device *dev, int phy_id, int location, int value);
+static int  netdev_open(struct net_device *dev);
+static void check_duplex(struct net_device *dev);
+static void netdev_timer(unsigned long data);
+static void tx_timeout(struct net_device *dev);
+static int  rx_ring_fill(struct net_device *dev);
+static void init_ring(struct net_device *dev);
+static int  start_tx(struct sk_buff *skb, struct net_device *dev);
+static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
+static void netdev_error(struct net_device *dev, int intr_status);
+static int  netdev_rx(struct net_device *dev);
+static void netdev_error(struct net_device *dev, int intr_status);
+static void set_rx_mode(struct net_device *dev);
+static struct net_device_stats *get_stats(struct net_device *dev);
+static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static int  netdev_close(struct net_device *dev);
+
+
+
+/* A list of our installed devices, for removing the driver module. */
+static struct net_device *root_net_dev = NULL;
+
+#ifndef MODULE
+int ns820_probe(struct net_device *dev)
+{
+	if (pci_drv_register(&ns820_drv_id, dev) < 0)
+		return -ENODEV;
+	printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
+	return 0;
+}
+#endif
+
+static void *ns820_probe1(struct pci_dev *pdev, void *init_dev,
+						  long ioaddr, int irq, int chip_idx, int card_idx)
+{
+	struct net_device *dev;
+	struct netdev_private *np;
+	void *priv_mem;
+	int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
+
+	dev = init_etherdev(init_dev, 0);
+	if (!dev)
+		return NULL;
+
+	/* Perhaps NETIF_MSG_PROBE */
+	printk(KERN_INFO "%s: %s at 0x%lx, ",
+		   dev->name, pci_id_tbl[chip_idx].name, ioaddr);
+
+	for (i = 0; i < 3; i++)
+		((u16 *)dev->dev_addr)[i] = le16_to_cpu(eeprom_read(ioaddr, 12 - i));
+	for (i = 0; i < 5; i++)
+		printk("%2.2x:", dev->dev_addr[i]);
+	printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
+
+	/* Reset the chip to erase previous misconfiguration. */
+	writel(ChipReset, ioaddr + ChipCmd);
+	/* Power up Xcvr. */
+	writel(~CfgXcrOff & readl(ioaddr + ChipConfig), ioaddr + ChipConfig);
+
+	/* Make certain elements e.g. descriptor lists are aligned. */
+	priv_mem = kmalloc(sizeof(*np) + PRIV_ALIGN, GFP_KERNEL);
+	/* Check for the very unlikely case of no memory. */
+	if (priv_mem == NULL)
+		return NULL;
+
+	dev->base_addr = ioaddr;
+	dev->irq = irq;
+
+	dev->priv = np = (void *)(((long)priv_mem + PRIV_ALIGN) & ~PRIV_ALIGN);
+	memset(np, 0, sizeof(*np));
+	np->priv_addr = priv_mem;
+
+	np->next_module = root_net_dev;
+	root_net_dev = dev;
+
+	np->pci_dev = pdev;
+	np->chip_id = chip_idx;
+	np->drv_flags = pci_id_tbl[chip_idx].drv_flags;
+	np->msg_level = (1 << debug) - 1;
+	np->rx_copybreak = rx_copybreak;
+	np->max_interrupt_work = max_interrupt_work;
+	np->multicast_filter_limit = multicast_filter_limit;
+
+	if (dev->mem_start)
+		option = dev->mem_start;
+
+	/* The lower four bits are the media type. */
+	if (option > 0) {
+		if (option & 0x220)
+			np->full_duplex = 1;
+		np->default_port = option & 0x33ff;
+		if (np->default_port & 0x330)
+			np->medialock = 1;
+	}
+	if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
+		np->full_duplex = 1;
+
+	if (np->full_duplex) {
+		if (np->msg_level & NETIF_MSG_PROBE)
+			printk(KERN_INFO "%s: Set to forced full duplex, autonegotiation"
+				   " disabled.\n", dev->name);
+		np->duplex_lock = 1;
+	}
+
+	/* The chip-specific entries in the device structure. */
+	dev->open = &netdev_open;
+	dev->hard_start_xmit = &start_tx;
+	dev->stop = &netdev_close;
+	dev->get_stats = &get_stats;
+	dev->set_multicast_list = &set_rx_mode;
+	dev->do_ioctl = &mii_ioctl;
+
+	/* Allow forcing the media type. */
+	if (option > 0) {
+		if (option & 0x220)
+			np->full_duplex = 1;
+		np->default_port = option & 0x3ff;
+		if (np->default_port & 0x330) {
+			np->medialock = 1;
+			if (np->msg_level & NETIF_MSG_PROBE)
+				printk(KERN_INFO "  Forcing %dMbs %s-duplex operation.\n",
+					   (option & 0x300 ? 100 : 10),
+					   (np->full_duplex ? "full" : "half"));
+			mdio_write(dev, 1, 0,
+					   ((option & 0x300) ? 0x2000 : 0) | 	/* 100mbps? */
+					   (np->full_duplex ? 0x0100 : 0)); /* Full duplex? */
+		}
+	}
+
+	return dev;
+}
+
+
+/* Read the EEPROM and MII Management Data I/O (MDIO) interfaces.
+   The EEPROM code is for the common 93c06/46 EEPROMs with 6 bit addresses.
+   Update to the code in other drivers for 8/10 bit addresses.
+*/
+
+/* Delay between EEPROM clock transitions.
+   This "delay" forces out buffered PCI writes, which is sufficient to meet
+   the timing requirements of most EEPROMs.
+*/
+#define eeprom_delay(ee_addr)	readl(ee_addr)
+
+enum EEPROM_Ctrl_Bits {
+	EE_ShiftClk=0x04, EE_DataIn=0x01, EE_ChipSelect=0x08, EE_DataOut=0x02,
+};
+#define EE_Write0 (EE_ChipSelect)
+#define EE_Write1 (EE_ChipSelect | EE_DataIn)
+
+/* The EEPROM commands include the 01 preamble. */
+enum EEPROM_Cmds {
+	EE_WriteCmd=5, EE_ReadCmd=6, EE_EraseCmd=7,
+};
+
+static int eeprom_read(long addr, int location)
+{
+	long eeprom_addr = addr + EECtrl;
+	int read_cmd = (EE_ReadCmd << 6) | location;
+	int retval = 0;
+	int i;
+
+	writel(EE_Write0, eeprom_addr);
+
+	/* Shift the read command bits out. */
+	for (i = 10; i >= 0; i--) {
+		int dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
+		writel(dataval, eeprom_addr);
+		eeprom_delay(eeprom_addr);
+		writel(dataval | EE_ShiftClk, eeprom_addr);
+		eeprom_delay(eeprom_addr);
+	}
+	writel(EE_ChipSelect, eeprom_addr);
+	eeprom_delay(eeprom_addr);
+
+	for (i = 15; i >= 0; i--) {
+		writel(EE_ChipSelect | EE_ShiftClk, eeprom_addr);
+		eeprom_delay(eeprom_addr);
+		retval |= (readl(eeprom_addr) & EE_DataOut) ? 1 << i : 0;
+		writel(EE_ChipSelect, eeprom_addr);
+		eeprom_delay(eeprom_addr);
+	}
+
+	/* Terminate the EEPROM access. */
+	writel(EE_Write0, eeprom_addr);
+	writel(0, eeprom_addr);
+	return retval;
+}
+
+/*  MII transceiver control section.
+	Read and write MII registers using software-generated serial MDIO
+	protocol.  See the MII specifications or DP83840A data sheet for details.
+
+	The maximum data clock rate is 2.5 Mhz.  To meet minimum timing we
+	must flush writes to the PCI bus with a PCI read. */
+#define mdio_delay(mdio_addr) readl(mdio_addr)
+
+/* Set iff a MII transceiver on any interface requires mdio preamble.
+   This only set with older tranceivers, so the extra
+   code size of a per-interface flag is not worthwhile. */
+static char mii_preamble_required = 0;
+
+enum mii_reg_bits {
+	MDIO_ShiftClk=0x0040, MDIO_Data=0x0010, MDIO_EnbOutput=0x0020,
+};
+#define MDIO_EnbIn  (0)
+#define MDIO_WRITE0 (MDIO_EnbOutput)
+#define MDIO_WRITE1 (MDIO_Data | MDIO_EnbOutput)
+
+/* Generate the preamble required for initial synchronization and
+   a few older transceivers. */
+static void mdio_sync(long mdio_addr)
+{
+	int bits = 32;
+
+	/* Establish sync by sending at least 32 logic ones. */
+	while (--bits >= 0) {
+		writel(MDIO_WRITE1, mdio_addr);
+		mdio_delay(mdio_addr);
+		writel(MDIO_WRITE1 | MDIO_ShiftClk, mdio_addr);
+		mdio_delay(mdio_addr);
+	}
+}
+
+static int mdio_read(struct net_device *dev, int phy_id, int location)
+{
+	long mdio_addr = dev->base_addr + EECtrl;
+	int mii_cmd = (0xf6 << 10) | (phy_id << 5) | location;
+	int i, retval = 0;
+
+	if (mii_preamble_required)
+		mdio_sync(mdio_addr);
+
+	/* Shift the read command bits out. */
+	for (i = 15; i >= 0; i--) {
+		int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
+
+		writel(dataval, mdio_addr);
+		mdio_delay(mdio_addr);
+		writel(dataval | MDIO_ShiftClk, mdio_addr);
+		mdio_delay(mdio_addr);
+	}
+	/* Read the two transition, 16 data, and wire-idle bits. */
+	for (i = 19; i > 0; i--) {
+		writel(MDIO_EnbIn, mdio_addr);
+		mdio_delay(mdio_addr);
+		retval = (retval << 1) | ((readl(mdio_addr) & MDIO_Data) ? 1 : 0);
+		writel(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
+		mdio_delay(mdio_addr);
+	}
+	return (retval>>1) & 0xffff;
+}
+
+static void mdio_write(struct net_device *dev, int phy_id, int location, int value)
+{
+	long mdio_addr = dev->base_addr + EECtrl;
+	int mii_cmd = (0x5002 << 16) | (phy_id << 23) | (location<<18) | value;
+	int i;
+
+	if (mii_preamble_required)
+		mdio_sync(mdio_addr);
+
+	/* Shift the command bits out. */
+	for (i = 31; i >= 0; i--) {
+		int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
+
+		writel(dataval, mdio_addr);
+		mdio_delay(mdio_addr);
+		writel(dataval | MDIO_ShiftClk, mdio_addr);
+		mdio_delay(mdio_addr);
+	}
+	/* Clear out extra bits. */
+	for (i = 2; i > 0; i--) {
+		writel(MDIO_EnbIn, mdio_addr);
+		mdio_delay(mdio_addr);
+		writel(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
+		mdio_delay(mdio_addr);
+	}
+	return;
+}
+
+static int netdev_open(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+	int i;
+	u32 intr_status = readl(ioaddr + IntrStatus);
+
+	/* We have not yet encountered a case where we need to reset the chip. */
+
+	MOD_INC_USE_COUNT;
+
+	if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev)) {
+		MOD_DEC_USE_COUNT;
+		return -EAGAIN;
+	}
+
+	/* Power up Xcvr. */
+	writel((~CfgXcrOff & readl(ioaddr + ChipConfig)) | 0x00400000,
+		   ioaddr + ChipConfig);
+	if (np->msg_level & NETIF_MSG_IFUP)
+		printk(KERN_DEBUG "%s: netdev_open() irq %d intr_status %8.8x.\n",
+			   dev->name, dev->irq, intr_status);
+
+	init_ring(dev);
+
+#if defined(ADDR_64BITS) && defined(__alpha__)
+	writel(virt_to_bus(np->rx_ring) >> 32, ioaddr + RxRingPtrHi);
+	writel(virt_to_bus(np->tx_ring) >> 32, ioaddr + TxRingPtrHi);
+#else
+	writel(0, ioaddr + RxRingPtrHi);
+	writel(0, ioaddr + TxRingPtrHi);
+#endif
+	writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
+	writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
+
+	for (i = 0; i < 6; i += 2) {
+		writel(i, ioaddr + RxFilterAddr);
+		writel(dev->dev_addr[i] + (dev->dev_addr[i+1] << 8),
+			   ioaddr + RxFilterData);
+	}
+
+	/* Initialize other registers. */
+	/* Configure the PCI bus bursts and FIFO thresholds. */
+	/* Configure for standard, in-spec Ethernet. */
+
+	if (np->full_duplex  ||
+		((readl(ioaddr + ChipConfig) & CfgFDX) == 0) ^
+		((np->drv_flags & FDXActiveLow) != 0)) {
+		np->tx_config = 0xD0801002;
+		np->rx_config = 0x10000020;
+	} else {
+		np->tx_config = 0x10801002;
+		np->rx_config = 0x0020;
+	}
+	if (dev->mtu > 1500)
+		np->rx_config |= 0x08000000;
+	writel(np->tx_config, ioaddr + TxConfig);
+	writel(np->rx_config, ioaddr + RxConfig);
+	if (np->msg_level & NETIF_MSG_IFUP)
+		printk(KERN_DEBUG "%s: Setting TxConfig to %8.8x.\n",
+			   dev->name, (int)readl(ioaddr + TxConfig));
+
+	if (dev->if_port == 0)
+		dev->if_port = np->default_port;
+
+	np->in_interrupt = 0;
+
+	check_duplex(dev);
+	set_rx_mode(dev);
+	netif_start_tx_queue(dev);
+
+	/* Enable interrupts by setting the interrupt mask. */
+	np->intr_enable = IntrNormalSummary | IntrAbnormalSummary | 0x1f;
+	writel(np->intr_enable, ioaddr + IntrMask);
+	writel(1, ioaddr + IntrEnable);
+
+	writel(RxOn | TxOn, ioaddr + ChipCmd);
+	writel(4, ioaddr + StatsCtrl);					/* Clear Stats */
+
+	if (np->msg_level & NETIF_MSG_IFUP)
+		printk(KERN_DEBUG "%s: Done netdev_open(), status: %x.\n",
+			   dev->name, (int)readl(ioaddr + ChipCmd));
+
+	/* Set the timer to check for link beat. */
+	init_timer(&np->timer);
+	np->timer.expires = jiffies + 3*HZ;
+	np->timer.data = (unsigned long)dev;
+	np->timer.function = &netdev_timer;				/* timer handler */
+	add_timer(&np->timer);
+
+	return 0;
+}
+
+static void check_duplex(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+	int duplex;
+
+	if (np->duplex_lock)
+		return;
+	duplex = readl(ioaddr + ChipConfig) & CfgFDX ? 1 : 0;
+	if (np->full_duplex != duplex) {
+		np->full_duplex = duplex;
+		if (np->msg_level & NETIF_MSG_LINK)
+			printk(KERN_INFO "%s: Setting %s-duplex based on negotiated link"
+				   " capability.\n", dev->name,
+				   duplex ? "full" : "half");
+		if (duplex) {
+			np->rx_config |= 0x10000000;
+			np->tx_config |= 0xC0000000;
+		} else {
+			np->rx_config &= ~0x10000000;
+			np->tx_config &= ~0xC0000000;
+		}
+		writel(np->tx_config, ioaddr + TxConfig);
+		writel(np->rx_config, ioaddr + RxConfig);
+		if (np->msg_level & NETIF_MSG_LINK)
+			printk(KERN_DEBUG "%s: Setting TxConfig to %8.8x (%8.8x).\n",
+				   dev->name, np->tx_config, (int)readl(ioaddr + TxConfig));
+	}
+}
+
+static void netdev_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+	int next_tick = 10*HZ;
+
+	if (np->msg_level & NETIF_MSG_TIMER)
+		printk(KERN_DEBUG "%s: Driver monitor timer tick, status %8.8x.\n",
+			   dev->name, (int)readl(ioaddr + ChipConfig));
+	if (np->rx_q_empty) {
+		/* Trigger an interrupt to refill. */
+		writel(SoftIntr, ioaddr + ChipCmd);
+	}
+	if (netif_queue_paused(dev)  &&
+		np->cur_tx - np->dirty_tx > 1  &&
+		(jiffies - dev->trans_start) > TX_TIMEOUT) {
+		tx_timeout(dev);
+	}
+	check_duplex(dev);
+	np->timer.expires = jiffies + next_tick;
+	add_timer(&np->timer);
+}
+
+static void tx_timeout(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+
+	printk(KERN_WARNING "%s: Transmit timed out, status %8.8x,"
+		   " resetting...\n", dev->name, (int)readl(ioaddr + TxRingPtr));
+
+	if (np->msg_level & NETIF_MSG_TX_ERR) {
+		int i;
+		printk(KERN_DEBUG "  Rx ring %p: ", np->rx_ring);
+		for (i = 0; i < RX_RING_SIZE; i++)
+			printk(" %8.8x", (unsigned int)np->rx_ring[i].cmd_status);
+		printk("\n"KERN_DEBUG"  Tx ring %p: ", np->tx_ring);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(" %4.4x", np->tx_ring[i].cmd_status);
+		printk("\n");
+	}
+
+	/* Perhaps we should reinitialize the hardware here. */
+	dev->if_port = 0;
+	/* Stop and restart the chip's Tx processes . */
+
+	/* Trigger an immediate transmit demand. */
+
+	dev->trans_start = jiffies;
+	np->stats.tx_errors++;
+	return;
+}
+
+/* Refill the Rx ring buffers, returning non-zero if not full. */
+static int rx_ring_fill(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	unsigned int entry;
+
+	for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
+		entry = np->dirty_rx % RX_RING_SIZE;
+		if (np->rx_skbuff[entry] == NULL) {
+			struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
+			np->rx_skbuff[entry] = skb;
+			if (skb == NULL)
+				return 1;				/* Better luck next time. */
+			skb->dev = dev;			/* Mark as being used by this device. */
+			np->rx_ring[entry].buf_addr = virt_to_bus(skb->tail);
+		}
+		np->rx_ring[entry].cmd_status = cpu_to_le32(DescIntr | np->rx_buf_sz);
+	}
+	return 0;
+}
+
+/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
+static void init_ring(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	int i;
+
+	np->tx_full = 0;
+	np->cur_rx = np->cur_tx = 0;
+	np->dirty_rx = np->dirty_tx = 0;
+
+	/* MAX(PKT_BUF_SZ, dev->mtu + 8); */
+	/* I know you _want_ to change this without understanding it.  Don't. */
+	np->rx_buf_sz = (dev->mtu <= 1532 ? PKT_BUF_SZ : dev->mtu + 8);
+	np->rx_head_desc = &np->rx_ring[0];
+
+	/* Initialize all Rx descriptors. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		np->rx_ring[i].next_desc = virt_to_bus(&np->rx_ring[i+1]);
+		np->rx_ring[i].cmd_status = cpu_to_le32(DescOwn);
+		np->rx_skbuff[i] = 0;
+	}
+	/* Mark the last entry as wrapping the ring. */
+	np->rx_ring[i-1].next_desc = virt_to_bus(&np->rx_ring[0]);
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		np->tx_skbuff[i] = 0;
+		np->tx_ring[i].next_desc = virt_to_bus(&np->tx_ring[i+1]);
+		np->tx_ring[i].cmd_status = 0;
+	}
+	np->tx_ring[i-1].next_desc = virt_to_bus(&np->tx_ring[0]);
+
+	/* Fill in the Rx buffers.
+	   Allocation failure just leaves a "negative" np->dirty_rx. */
+	np->dirty_rx = (unsigned int)(0 - RX_RING_SIZE);
+	rx_ring_fill(dev);
+
+	return;
+}
+
+static int start_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	unsigned int entry;
+
+	/* Block a timer-based transmit from overlapping.  This happens when
+	   packets are presumed lost, and we use this check the Tx status. */
+	if (netif_pause_tx_queue(dev) != 0) {
+		/* This watchdog code is redundant with the media monitor timer. */
+		if (jiffies - dev->trans_start > TX_TIMEOUT)
+			tx_timeout(dev);
+		return 1;
+	}
+
+	/* Note: Ordering is important here, set the field with the
+	   "ownership" bit last, and only then increment cur_tx.
+	   No spinlock is needed for either Tx or Rx.
+	*/
+
+	/* Calculate the next Tx descriptor entry. */
+	entry = np->cur_tx % TX_RING_SIZE;
+
+	np->tx_skbuff[entry] = skb;
+
+	np->tx_ring[entry].buf_addr = virt_to_bus(skb->data);
+	np->tx_ring[entry].cmd_status = cpu_to_le32(DescOwn|DescIntr | skb->len);
+	np->cur_tx++;
+
+	/* StrongARM: Explicitly cache flush np->tx_ring and skb->data,skb->len. */
+
+	if (np->cur_tx - np->dirty_tx >= TX_QUEUE_LEN - 1) {
+		np->tx_full = 1;
+		/* Check for a just-cleared queue. */
+		if (np->cur_tx - (volatile unsigned int)np->dirty_tx
+			< TX_QUEUE_LEN - 4) {
+			np->tx_full = 0;
+			netif_unpause_tx_queue(dev);
+		} else
+			netif_stop_tx_queue(dev);
+	} else
+		netif_unpause_tx_queue(dev);		/* Typical path */
+	/* Wake the potentially-idle transmit channel. */
+	writel(TxOn, dev->base_addr + ChipCmd);
+
+	dev->trans_start = jiffies;
+
+	if (np->msg_level & NETIF_MSG_TX_QUEUED) {
+		printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
+			   dev->name, np->cur_tx, entry);
+	}
+	return 0;
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
+{
+	struct net_device *dev = (struct net_device *)dev_instance;
+	struct netdev_private *np;
+	long ioaddr;
+	int boguscnt;
+
+#ifndef final_version			/* Can never occur. */
+	if (dev == NULL) {
+		printk (KERN_ERR "Netdev interrupt handler(): IRQ %d for unknown "
+				"device.\n", irq);
+		return;
+	}
+#endif
+
+	ioaddr = dev->base_addr;
+	np = (struct netdev_private *)dev->priv;
+	boguscnt = np->max_interrupt_work;
+
+#if defined(__i386__)  &&  LINUX_VERSION_CODE < 0x020300
+	/* A lock to prevent simultaneous entry bug on Intel SMP machines. */
+	if (test_and_set_bit(0, (void*)&dev->interrupt)) {
+		printk(KERN_ERR"%s: SMP simultaneous entry of an interrupt handler.\n",
+			   dev->name);
+		dev->interrupt = 0;	/* Avoid halting machine. */
+		return;
+	}
+#endif
+
+	do {
+		u32 intr_status = readl(ioaddr + IntrStatus);
+
+		if (np->msg_level & NETIF_MSG_INTR)
+			printk(KERN_DEBUG "%s: Interrupt, status %8.8x.\n",
+				   dev->name, intr_status);
+
+		if (intr_status == 0 || intr_status == 0xffffffff)
+			break;
+
+		/* Acknowledge all of the current interrupt sources ASAP.
+		   Nominally the read above accomplishes this, but... */
+		writel(intr_status & 0x001ffff, ioaddr + IntrStatus);
+
+		if (intr_status & (IntrRxDone | IntrRxIntr)) {
+			netdev_rx(dev);
+			np->rx_q_empty = rx_ring_fill(dev);
+		}
+
+		if (intr_status & (IntrRxIdle | IntrDrv)) {
+			unsigned int old_dirty_rx = np->dirty_rx;
+			if (rx_ring_fill(dev) == 0)
+				np->rx_q_empty = 0;
+			/* Restart Rx engine iff we did add a buffer. */
+			if (np->dirty_rx != old_dirty_rx)
+				writel(RxOn, dev->base_addr + ChipCmd);
+		}
+
+		for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
+			int entry = np->dirty_tx % TX_RING_SIZE;
+			if (np->msg_level & NETIF_MSG_INTR)
+				printk(KERN_DEBUG "%s: Tx entry %d @%p status %8.8x.\n",
+					   dev->name, entry, &np->tx_ring[entry],
+					   np->tx_ring[entry].cmd_status);
+			if (np->tx_ring[entry].cmd_status & cpu_to_le32(DescOwn))
+				break;
+			if (np->tx_ring[entry].cmd_status & cpu_to_le32(0x08000000)) {
+				if (np->msg_level & NETIF_MSG_TX_DONE)
+					printk(KERN_DEBUG "%s: Transmit done, Tx status %8.8x.\n",
+						   dev->name, np->tx_ring[entry].cmd_status);
+				np->stats.tx_packets++;
+#if LINUX_VERSION_CODE > 0x20127
+				np->stats.tx_bytes += np->tx_skbuff[entry]->len;
+#endif
+			} else {			/* Various Tx errors */
+				int tx_status = le32_to_cpu(np->tx_ring[entry].cmd_status);
+				if (tx_status & 0x04010000) np->stats.tx_aborted_errors++;
+				if (tx_status & 0x02000000) np->stats.tx_fifo_errors++;
+				if (tx_status & 0x01000000) np->stats.tx_carrier_errors++;
+				if (tx_status & 0x00200000) np->stats.tx_window_errors++;
+				if (np->msg_level & NETIF_MSG_TX_ERR)
+					printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
+						   dev->name, tx_status);
+				np->stats.tx_errors++;
+			}
+			/* Free the original skb. */
+			dev_free_skb_irq(np->tx_skbuff[entry]);
+			np->tx_skbuff[entry] = 0;
+		}
+		/* Note the 4 slot hysteresis to mark the queue non-full. */
+		if (np->tx_full
+			&& np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
+			/* The ring is no longer full, allow new TX entries. */
+			np->tx_full = 0;
+			netif_resume_tx_queue(dev);
+		}
+
+		/* Abnormal error summary/uncommon events handlers. */
+		if (intr_status & IntrAbnormalSummary)
+			netdev_error(dev, intr_status);
+
+		if (--boguscnt < 0) {
+			printk(KERN_WARNING "%s: Too much work at interrupt, "
+				   "status=0x%4.4x.\n",
+				   dev->name, intr_status);
+			np->restore_intr_enable = 1;
+			break;
+		}
+	} while (1);
+
+	if (np->msg_level & NETIF_MSG_INTR)
+		printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
+			   dev->name, (int)readl(ioaddr + IntrStatus));
+
+#if defined(__i386__)  &&  LINUX_VERSION_CODE < 0x020300
+	clear_bit(0, (void*)&dev->interrupt);
+#endif
+	return;
+}
+
+/* This routine is logically part of the interrupt handler, but separated
+   for clarity and better register allocation. */
+static int netdev_rx(struct net_device *dev)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	int entry = np->cur_rx % RX_RING_SIZE;
+	int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
+	s32 desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
+
+	/* If the driver owns the next entry it's a new packet. Send it up. */
+	while (desc_status < 0) {        /* e.g. & DescOwn */
+		if (np->msg_level & NETIF_MSG_RX_STATUS)
+			printk(KERN_DEBUG "  In netdev_rx() entry %d status was %8.8x.\n",
+				   entry, desc_status);
+		if (--boguscnt < 0)
+			break;
+		if ((desc_status & (DescMore|DescPktOK|RxTooLong)) != DescPktOK) {
+			if (desc_status & DescMore) {
+				printk(KERN_WARNING "%s: Oversized(?) Ethernet frame spanned "
+					   "multiple buffers, entry %#x status %x.\n",
+					   dev->name, np->cur_rx, desc_status);
+				np->stats.rx_length_errors++;
+			} else {
+				/* There was a error. */
+				if (np->msg_level & NETIF_MSG_RX_ERR)
+					printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
+						   desc_status);
+				np->stats.rx_errors++;
+				if (desc_status & 0x06000000) np->stats.rx_over_errors++;
+				if (desc_status & 0x00600000) np->stats.rx_length_errors++;
+				if (desc_status & 0x00140000) np->stats.rx_frame_errors++;
+				if (desc_status & 0x00080000) np->stats.rx_crc_errors++;
+			}
+		} else {
+			struct sk_buff *skb;
+			int pkt_len = (desc_status & 0x0fff) - 4;	/* Omit CRC size. */
+			/* Check if the packet is long enough to accept without copying
+			   to a minimally-sized skbuff. */
+			if (pkt_len < np->rx_copybreak
+				&& (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
+				skb->dev = dev;
+				skb_reserve(skb, 2);	/* 16 byte align the IP header */
+#if HAS_IP_COPYSUM
+				eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
+				skb_put(skb, pkt_len);
+#else
+				memcpy(skb_put(skb, pkt_len), np->rx_skbuff[entry]->tail,
+					   pkt_len);
+#endif
+			} else {
+				skb_put(skb = np->rx_skbuff[entry], pkt_len);
+				np->rx_skbuff[entry] = NULL;
+			}
+#ifndef final_version				/* Remove after testing. */
+			/* You will want this info for the initial debug. */
+			if (np->msg_level & NETIF_MSG_PKTDATA)
+				printk(KERN_DEBUG "  Rx data %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:"
+					   "%2.2x %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x %2.2x%2.2x "
+					   "%d.%d.%d.%d.\n",
+					   skb->data[0], skb->data[1], skb->data[2], skb->data[3],
+					   skb->data[4], skb->data[5], skb->data[6], skb->data[7],
+					   skb->data[8], skb->data[9], skb->data[10],
+					   skb->data[11], skb->data[12], skb->data[13],
+					   skb->data[14], skb->data[15], skb->data[16],
+					   skb->data[17]);
+#endif
+			skb->protocol = eth_type_trans(skb, dev);
+			/* W/ hardware checksum: skb->ip_summed = CHECKSUM_UNNECESSARY; */
+			netif_rx(skb);
+			dev->last_rx = jiffies;
+			np->stats.rx_packets++;
+#if LINUX_VERSION_CODE > 0x20127
+			np->stats.rx_bytes += pkt_len;
+#endif
+		}
+		entry = (++np->cur_rx) % RX_RING_SIZE;
+		np->rx_head_desc = &np->rx_ring[entry];
+		desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
+	}
+
+	/* Refill is now done in the main interrupt loop. */
+	return 0;
+}
+
+static void netdev_error(struct net_device *dev, int intr_status)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+
+	if (intr_status & LinkChange) {
+		int chip_config = readl(ioaddr + ChipConfig);
+		if (np->msg_level & NETIF_MSG_LINK)
+			printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
+				   " %4.4x  partner %4.4x.\n", dev->name,
+				   (int)readl(ioaddr + 0x90), (int)readl(ioaddr + 0x94));
+		if (chip_config & CfgLinkGood)
+			netif_link_up(dev);
+		else
+			netif_link_down(dev);
+		check_duplex(dev);
+	}
+	if (intr_status & StatsMax) {
+		get_stats(dev);
+	}
+	if (intr_status & IntrTxUnderrun) {
+		/* Increase the Tx threshold, 32 byte units. */
+		if ((np->tx_config & 0x3f) < 62)
+			np->tx_config += 2;			/* +64 bytes */
+		writel(np->tx_config, ioaddr + TxConfig);
+	}
+	if (intr_status & WOLPkt) {
+		int wol_status = readl(ioaddr + WOLCmd);
+		printk(KERN_NOTICE "%s: Link wake-up event %8.8x",
+			   dev->name, wol_status);
+	}
+	if (intr_status & (RxStatusOverrun | IntrRxOverrun)) {
+		if (np->msg_level & NETIF_MSG_DRV)
+			printk(KERN_ERR "%s: Rx overflow! ns820 %8.8x.\n",
+				   dev->name, intr_status);
+		np->stats.rx_fifo_errors++;
+	}
+	if (intr_status & ~(LinkChange|StatsMax|RxResetDone|TxResetDone|
+						RxStatusOverrun|0xA7ff)) {
+		if (np->msg_level & NETIF_MSG_DRV)
+			printk(KERN_ERR "%s: Something Wicked happened! ns820 %8.8x.\n",
+				   dev->name, intr_status);
+	}
+	/* Hmmmmm, it's not clear how to recover from PCI faults. */
+	if (intr_status & IntrPCIErr) {
+		np->stats.tx_fifo_errors++;
+		np->stats.rx_fifo_errors++;
+	}
+}
+
+static struct net_device_stats *get_stats(struct net_device *dev)
+{
+	long ioaddr = dev->base_addr;
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	int crc_errs = readl(ioaddr + RxCRCErrs);
+
+	if (crc_errs != 0xffffffff) {
+		/* We need not lock this segment of code for SMP.
+		   There is no atomic-add vulnerability for most CPUs,
+		   and statistics are non-critical. */
+		/* The chip only need report frame silently dropped. */
+		np->stats.rx_crc_errors	+= crc_errs;
+		np->stats.rx_missed_errors += readl(ioaddr + RxMissed);
+	}
+
+	return &np->stats;
+}
+
+/* The little-endian AUTODIN II ethernet CRC calculations.
+   A big-endian version is also available.
+   This is slow but compact code.  Do not use this routine for bulk data,
+   use a table-based routine instead.
+   This is common code and should be moved to net/core/crc.c.
+   Chips may use the upper or lower CRC bits, and may reverse and/or invert
+   them.  Select the endian-ness that results in minimal calculations.
+*/
+static unsigned const ethernet_polynomial_le = 0xedb88320U;
+static inline unsigned ether_crc_le(int length, unsigned char *data)
+{
+	unsigned int crc = 0xffffffff;	/* Initial value. */
+	while(--length >= 0) {
+		unsigned char current_octet = *data++;
+		int bit;
+		for (bit = 8; --bit >= 0; current_octet >>= 1) {
+			if ((crc ^ current_octet) & 1) {
+				crc >>= 1;
+				crc ^= ethernet_polynomial_le;
+			} else
+				crc >>= 1;
+		}
+	}
+	return crc;
+}
+
+static void set_rx_mode(struct net_device *dev)
+{
+	long ioaddr = dev->base_addr;
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	u8 mc_filter[64];			/* Multicast hash filter */
+	u32 rx_mode;
+
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
+		/* Unconditionally log net taps. */
+		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
+		rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptAllPhys
+			| AcceptMyPhys;
+	} else if ((dev->mc_count > np->multicast_filter_limit)
+			   ||  (dev->flags & IFF_ALLMULTI)) {
+		rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptMyPhys;
+	} else {
+		struct dev_mc_list *mclist;
+		int i;
+		memset(mc_filter, 0, sizeof(mc_filter));
+		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
+			 i++, mclist = mclist->next) {
+			set_bit(ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x7ff,
+					mc_filter);
+		}
+		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
+		for (i = 0; i < 64; i += 2) {
+			writel(rx_mode + 0x200 + i, ioaddr + RxFilterAddr);
+			writel((mc_filter[i+1]<<8) + mc_filter[i], ioaddr + RxFilterData);
+		}
+	}
+	writel(rx_mode, ioaddr + RxFilterAddr);
+	np->cur_rx_mode = rx_mode;
+}
+
+static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	u16 *data = (u16 *)&rq->ifr_data;
+	u32 *data32 = (void *)&rq->ifr_data;
+
+	switch(cmd) {
+	case 0x8947: case 0x89F0:
+		/* SIOCGMIIPHY: Get the address of the PHY in use. */
+		data[0] = 1;
+		/* Fall Through */
+	case 0x8948: case 0x89F1:
+		/* SIOCGMIIREG: Read the specified MII register. */
+		data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
+		return 0;
+	case 0x8949: case 0x89F2:
+		/* SIOCSMIIREG: Write the specified MII register */
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		if (data[0] == 1) {
+			u16 miireg = data[1] & 0x1f;
+			u16 value = data[2];
+			switch (miireg) {
+			case 0:
+				/* Check for autonegotiation on or reset. */
+				np->duplex_lock = (value & 0x9000) ? 0 : 1;
+				if (np->duplex_lock)
+					np->full_duplex = (value & 0x0100) ? 1 : 0;
+				break;
+			case 4: np->advertising = value; break;
+			}
+		}
+		mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
+		return 0;
+	case SIOCGPARAMS:
+		data32[0] = np->msg_level;
+		data32[1] = np->multicast_filter_limit;
+		data32[2] = np->max_interrupt_work;
+		data32[3] = np->rx_copybreak;
+		return 0;
+	case SIOCSPARAMS:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		np->msg_level = data32[0];
+		np->multicast_filter_limit = data32[1];
+		np->max_interrupt_work = data32[2];
+		np->rx_copybreak = data32[3];
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int netdev_close(struct net_device *dev)
+{
+	long ioaddr = dev->base_addr;
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	int i;
+
+	netif_stop_tx_queue(dev);
+
+	if (np->msg_level & NETIF_MSG_IFDOWN) {
+		printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x "
+			   "Int %2.2x.\n",
+			   dev->name, (int)readl(ioaddr + ChipCmd),
+			   (int)readl(ioaddr + IntrStatus));
+		printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
+			   dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
+	}
+
+	/* We don't want the timer to re-start anything. */
+	del_timer(&np->timer);
+
+	/* Disable interrupts using the mask. */
+	writel(0, ioaddr + IntrMask);
+	writel(0, ioaddr + IntrEnable);
+	writel(2, ioaddr + StatsCtrl);					/* Freeze Stats */
+
+	/* Stop the chip's Tx and Rx processes. */
+	writel(RxOff | TxOff, ioaddr + ChipCmd);
+
+	get_stats(dev);
+
+#ifdef __i386__
+	if (np->msg_level & NETIF_MSG_IFDOWN) {
+		printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
+			   (int)virt_to_bus(np->tx_ring));
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(" #%d desc. %8.8x %8.8x.\n",
+				   i, np->tx_ring[i].cmd_status, (u32)np->tx_ring[i].buf_addr);
+		printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
+			   (int)virt_to_bus(np->rx_ring));
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			printk(KERN_DEBUG " #%d desc. %8.8x %8.8x\n",
+				   i, np->rx_ring[i].cmd_status, (u32)np->rx_ring[i].buf_addr);
+		}
+	}
+#endif /* __i386__ debugging only */
+
+	free_irq(dev->irq, dev);
+
+	/* Free all the skbuffs in the Rx queue. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		np->rx_ring[i].cmd_status = 0;
+		np->rx_ring[i].buf_addr = 0xBADF00D0; /* An invalid address. */
+		if (np->rx_skbuff[i]) {
+#if LINUX_VERSION_CODE < 0x20100
+			np->rx_skbuff[i]->free = 1;
+#endif
+			dev_free_skb(np->rx_skbuff[i]);
+		}
+		np->rx_skbuff[i] = 0;
+	}
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		if (np->tx_skbuff[i])
+			dev_free_skb(np->tx_skbuff[i]);
+		np->tx_skbuff[i] = 0;
+	}
+
+	/* Power down Xcvr. */
+	writel(CfgXcrOff | readl(ioaddr + ChipConfig), ioaddr + ChipConfig);
+
+	MOD_DEC_USE_COUNT;
+
+	return 0;
+}
+
+static int power_event(void *dev_instance, int event)
+{
+	struct net_device *dev = dev_instance;
+	struct netdev_private *np = (struct netdev_private *)dev->priv;
+	long ioaddr = dev->base_addr;
+
+	if (np->msg_level & NETIF_MSG_LINK)
+		printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
+	switch(event) {
+	case DRV_ATTACH:
+		MOD_INC_USE_COUNT;
+		break;
+	case DRV_SUSPEND:
+		/* Disable interrupts, freeze stats, stop Tx and Rx. */
+		writel(0, ioaddr + IntrEnable);
+		writel(2, ioaddr + StatsCtrl);
+		writel(RxOff | TxOff, ioaddr + ChipCmd);
+		writel(CfgXcrOff | readl(ioaddr + ChipConfig), ioaddr + ChipConfig);
+		break;
+	case DRV_RESUME:
+		/* This is incomplete: the open() actions should be repeated. */
+		writel(~CfgXcrOff & readl(ioaddr + ChipConfig), ioaddr + ChipConfig);
+		set_rx_mode(dev);
+		writel(np->intr_enable, ioaddr + IntrEnable);
+		writel(1, ioaddr + IntrEnable);
+		writel(RxOn | TxOn, ioaddr + ChipCmd);
+		break;
+	case DRV_DETACH: {
+		struct net_device **devp, **next;
+		if (dev->flags & IFF_UP) {
+			/* Some, but not all, kernel versions close automatically. */
+			dev_close(dev);
+			dev->flags &= ~(IFF_UP|IFF_RUNNING);
+		}
+		unregister_netdev(dev);
+		release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
+		for (devp = &root_net_dev; *devp; devp = next) {
+			next = &((struct netdev_private *)(*devp)->priv)->next_module;
+			if (*devp == dev) {
+				*devp = *next;
+				break;
+			}
+		}
+		if (np->priv_addr)
+			kfree(np->priv_addr);
+		kfree(dev);
+		MOD_DEC_USE_COUNT;
+		break;
+	}
+	}
+
+	return 0;
+}
+
+
+#ifdef MODULE
+int init_module(void)
+{
+	/* Emit version even if no cards detected. */
+	printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
+#ifdef CARDBUS
+	register_driver(&etherdev_ops);
+	return 0;
+#else
+	return pci_drv_register(&ns820_drv_id, NULL);
+#endif
+}
+
+void cleanup_module(void)
+{
+	struct net_device *next_dev;
+
+#ifdef CARDBUS
+	unregister_driver(&etherdev_ops);
+#else
+	pci_drv_unregister(&ns820_drv_id);
+#endif
+
+	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
+	while (root_net_dev) {
+		struct netdev_private *np = (void *)(root_net_dev->priv);
+		unregister_netdev(root_net_dev);
+		iounmap((char *)root_net_dev->base_addr);
+		next_dev = np->next_module;
+		if (np->priv_addr)
+			kfree(np->priv_addr);
+		kfree(root_net_dev);
+		root_net_dev = next_dev;
+	}
+}
+
+#endif  /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "make KERNVER=`uname -r` ns820.o"
+ *  compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c ns820.c"
+ *  simple-compile-command: "gcc -DMODULE -O6 -c ns820.c"
+ *  c-indent-level: 4
+ *  c-basic-offset: 4
+ *  tab-width: 4
+ * End:
+ */