Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1586 insertions, 0 deletions

diff --git a/drivers/net/ethernet/smsc/epic100.c b/drivers/net/ethernet/smsc/epic100.c
new file mode 100644
index 0000000000..013e90d691
--- /dev/null
+++ b/drivers/net/ethernet/smsc/epic100.c
@@ -0,0 +1,1586 @@
+/* epic100.c: A SMC 83c170 EPIC/100 Fast Ethernet driver for Linux. */
+/*
+	Written/copyright 1997-2001 by Donald Becker.
+
+	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.
+
+	This driver is for the SMC83c170/175 "EPIC" series, as used on the
+	SMC EtherPower II 9432 PCI adapter, and several CardBus cards.
+
+	The author may be reached as becker@scyld.com, or C/O
+	Scyld Computing Corporation
+	410 Severn Ave., Suite 210
+	Annapolis MD 21403
+
+	Information and updates available at
+	http://www.scyld.com/network/epic100.html
+	[this link no longer provides anything useful -jgarzik]
+
+	---------------------------------------------------------------------
+
+*/
+
+#define DRV_NAME        "epic100"
+#define DRV_VERSION     "2.1"
+#define DRV_RELDATE     "Sept 11, 2006"
+
+/* The user-configurable values.
+   These may be modified when a driver module is loaded.*/
+
+static int debug = 1;			/* 1 normal messages, 0 quiet .. 7 verbose. */
+
+/* Used to pass the full-duplex flag, etc. */
+#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};
+
+/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
+   Setting to > 1518 effectively disables this feature. */
+static int rx_copybreak;
+
+/* Operational parameters that are set at compile time. */
+
+/* Keep the ring sizes a power of two for operational efficiency.
+   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.
+   There are no ill effects from too-large receive rings. */
+#define TX_RING_SIZE	256
+#define TX_QUEUE_LEN	240		/* Limit ring entries actually used.  */
+#define RX_RING_SIZE	256
+#define TX_TOTAL_SIZE	TX_RING_SIZE*sizeof(struct epic_tx_desc)
+#define RX_TOTAL_SIZE	RX_RING_SIZE*sizeof(struct epic_rx_desc)
+
+/* Operational parameters that usually are not changed. */
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (2*HZ)
+
+#define PKT_BUF_SZ		1536			/* Size of each temporary Rx buffer.*/
+
+/* Bytes transferred to chip before transmission starts. */
+/* Initial threshold, increased on underflow, rounded down to 4 byte units. */
+#define TX_FIFO_THRESH 256
+#define RX_FIFO_THRESH 1		/* 0-3, 0==32, 64,96, or 3==128 bytes  */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/crc32.h>
+#include <linux/bitops.h>
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <asm/byteorder.h>
+
+/* These identify the driver base version and may not be removed. */
+static char version[] =
+DRV_NAME ".c:v1.11 1/7/2001 Written by Donald Becker <becker@scyld.com>";
+static char version2[] =
+"  (unofficial 2.4.x kernel port, version " DRV_VERSION ", " DRV_RELDATE ")";
+
+MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
+MODULE_DESCRIPTION("SMC 83c170 EPIC series Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_param(debug, int, 0);
+module_param(rx_copybreak, int, 0);
+module_param_array(options, int, NULL, 0);
+module_param_array(full_duplex, int, NULL, 0);
+MODULE_PARM_DESC(debug, "EPIC/100 debug level (0-5)");
+MODULE_PARM_DESC(options, "EPIC/100: Bits 0-3: media type, bit 4: full duplex");
+MODULE_PARM_DESC(rx_copybreak, "EPIC/100 copy breakpoint for copy-only-tiny-frames");
+MODULE_PARM_DESC(full_duplex, "EPIC/100 full duplex setting(s) (1)");
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the SMC "EPIC/100", the SMC
+single-chip Ethernet controllers for PCI.  This chip is used on
+the SMC EtherPower II boards.
+
+II. Board-specific settings
+
+PCI bus devices are configured by the system at boot time, so no jumpers
+need to be set on the board.  The system BIOS will assign the
+PCI INTA signal to a (preferably otherwise unused) system IRQ line.
+Note: Kernel versions earlier than 1.3.73 do not support shared PCI
+interrupt lines.
+
+III. Driver operation
+
+IIIa. Ring buffers
+
+IVb. References
+
+http://www.smsc.com/media/Downloads_Public/discontinued/83c171.pdf
+http://www.smsc.com/media/Downloads_Public/discontinued/83c175.pdf
+http://scyld.com/expert/NWay.html
+http://www.national.com/pf/DP/DP83840A.html
+
+IVc. Errata
+
+*/
+
+
+enum chip_capability_flags { MII_PWRDWN=1, TYPE2_INTR=2, NO_MII=4 };
+
+#define EPIC_TOTAL_SIZE 0x100
+#define USE_IO_OPS 1
+
+#ifdef USE_IO_OPS
+#define EPIC_BAR	0
+#else
+#define EPIC_BAR	1
+#endif
+
+typedef enum {
+	SMSC_83C170_0,
+	SMSC_83C170,
+	SMSC_83C175,
+} chip_t;
+
+
+struct epic_chip_info {
+	const char *name;
+        int drv_flags;                          /* Driver use, intended as capability flags. */
+};
+
+
+/* indexed by chip_t */
+static const struct epic_chip_info pci_id_tbl[] = {
+	{ "SMSC EPIC/100 83c170",	TYPE2_INTR | NO_MII | MII_PWRDWN },
+	{ "SMSC EPIC/100 83c170",	TYPE2_INTR },
+	{ "SMSC EPIC/C 83c175",		TYPE2_INTR | MII_PWRDWN },
+};
+
+
+static const struct pci_device_id epic_pci_tbl[] = {
+	{ 0x10B8, 0x0005, 0x1092, 0x0AB4, 0, 0, SMSC_83C170_0 },
+	{ 0x10B8, 0x0005, PCI_ANY_ID, PCI_ANY_ID, 0, 0, SMSC_83C170 },
+	{ 0x10B8, 0x0006, PCI_ANY_ID, PCI_ANY_ID,
+	  PCI_CLASS_NETWORK_ETHERNET << 8, 0xffff00, SMSC_83C175 },
+	{ 0,}
+};
+MODULE_DEVICE_TABLE (pci, epic_pci_tbl);
+
+#define ew16(reg, val)	iowrite16(val, ioaddr + (reg))
+#define ew32(reg, val)	iowrite32(val, ioaddr + (reg))
+#define er8(reg)	ioread8(ioaddr + (reg))
+#define er16(reg)	ioread16(ioaddr + (reg))
+#define er32(reg)	ioread32(ioaddr + (reg))
+
+/* Offsets to registers, using the (ugh) SMC names. */
+enum epic_registers {
+  COMMAND=0, INTSTAT=4, INTMASK=8, GENCTL=0x0C, NVCTL=0x10, EECTL=0x14,
+  PCIBurstCnt=0x18,
+  TEST1=0x1C, CRCCNT=0x20, ALICNT=0x24, MPCNT=0x28,	/* Rx error counters. */
+  MIICtrl=0x30, MIIData=0x34, MIICfg=0x38,
+  LAN0=64,						/* MAC address. */
+  MC0=80,						/* Multicast filter table. */
+  RxCtrl=96, TxCtrl=112, TxSTAT=0x74,
+  PRxCDAR=0x84, RxSTAT=0xA4, EarlyRx=0xB0, PTxCDAR=0xC4, TxThresh=0xDC,
+};
+
+/* Interrupt register bits, using my own meaningful names. */
+enum IntrStatus {
+	TxIdle=0x40000, RxIdle=0x20000, IntrSummary=0x010000,
+	PCIBusErr170=0x7000, PCIBusErr175=0x1000, PhyEvent175=0x8000,
+	RxStarted=0x0800, RxEarlyWarn=0x0400, CntFull=0x0200, TxUnderrun=0x0100,
+	TxEmpty=0x0080, TxDone=0x0020, RxError=0x0010,
+	RxOverflow=0x0008, RxFull=0x0004, RxHeader=0x0002, RxDone=0x0001,
+};
+enum CommandBits {
+	StopRx=1, StartRx=2, TxQueued=4, RxQueued=8,
+	StopTxDMA=0x20, StopRxDMA=0x40, RestartTx=0x80,
+};
+
+#define EpicRemoved	0xffffffff	/* Chip failed or removed (CardBus) */
+
+#define EpicNapiEvent	(TxEmpty | TxDone | \
+			 RxDone | RxStarted | RxEarlyWarn | RxOverflow | RxFull)
+#define EpicNormalEvent	(0x0000ffff & ~EpicNapiEvent)
+
+static const u16 media2miictl[16] = {
+	0, 0x0C00, 0x0C00, 0x2000,  0x0100, 0x2100, 0, 0,
+	0, 0, 0, 0,  0, 0, 0, 0 };
+
+/*
+ * The EPIC100 Rx and Tx buffer descriptors.  Note that these
+ * really ARE host-endian; it's not a misannotation.  We tell
+ * the card to byteswap them internally on big-endian hosts -
+ * look for #ifdef __BIG_ENDIAN in epic_open().
+ */
+
+struct epic_tx_desc {
+	u32 txstatus;
+	u32 bufaddr;
+	u32 buflength;
+	u32 next;
+};
+
+struct epic_rx_desc {
+	u32 rxstatus;
+	u32 bufaddr;
+	u32 buflength;
+	u32 next;
+};
+
+enum desc_status_bits {
+	DescOwn=0x8000,
+};
+
+#define PRIV_ALIGN	15 	/* Required alignment mask */
+struct epic_private {
+	struct epic_rx_desc *rx_ring;
+	struct epic_tx_desc *tx_ring;
+	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
+	struct sk_buff* tx_skbuff[TX_RING_SIZE];
+	/* The addresses of receive-in-place skbuffs. */
+	struct sk_buff* rx_skbuff[RX_RING_SIZE];
+
+	dma_addr_t tx_ring_dma;
+	dma_addr_t rx_ring_dma;
+
+	/* Ring pointers. */
+	spinlock_t lock;				/* Group with Tx control cache line. */
+	spinlock_t napi_lock;
+	struct napi_struct napi;
+	unsigned int cur_tx, dirty_tx;
+
+	unsigned int cur_rx, dirty_rx;
+	u32 irq_mask;
+	unsigned int rx_buf_sz;				/* Based on MTU+slack. */
+
+	void __iomem *ioaddr;
+	struct pci_dev *pci_dev;			/* PCI bus location. */
+	int chip_id, chip_flags;
+
+	struct timer_list timer;			/* Media selection timer. */
+	int tx_threshold;
+	unsigned char mc_filter[8];
+	signed char phys[4];				/* MII device addresses. */
+	u16 advertising;					/* NWay media advertisement */
+	int mii_phy_cnt;
+	u32 ethtool_ops_nesting;
+	struct mii_if_info mii;
+	unsigned int tx_full:1;				/* The Tx queue is full. */
+	unsigned int default_port:4;		/* Last dev->if_port value. */
+};
+
+static int epic_open(struct net_device *dev);
+static int read_eeprom(struct epic_private *, int);
+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 loc, int val);
+static void epic_restart(struct net_device *dev);
+static void epic_timer(struct timer_list *t);
+static void epic_tx_timeout(struct net_device *dev, unsigned int txqueue);
+static void epic_init_ring(struct net_device *dev);
+static netdev_tx_t epic_start_xmit(struct sk_buff *skb,
+				   struct net_device *dev);
+static int epic_rx(struct net_device *dev, int budget);
+static int epic_poll(struct napi_struct *napi, int budget);
+static irqreturn_t epic_interrupt(int irq, void *dev_instance);
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static const struct ethtool_ops netdev_ethtool_ops;
+static int epic_close(struct net_device *dev);
+static struct net_device_stats *epic_get_stats(struct net_device *dev);
+static void set_rx_mode(struct net_device *dev);
+
+static const struct net_device_ops epic_netdev_ops = {
+	.ndo_open		= epic_open,
+	.ndo_stop		= epic_close,
+	.ndo_start_xmit		= epic_start_xmit,
+	.ndo_tx_timeout 	= epic_tx_timeout,
+	.ndo_get_stats		= epic_get_stats,
+	.ndo_set_rx_mode	= set_rx_mode,
+	.ndo_eth_ioctl		= netdev_ioctl,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int epic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int card_idx = -1;
+	void __iomem *ioaddr;
+	int chip_idx = (int) ent->driver_data;
+	struct net_device *dev;
+	struct epic_private *ep;
+	int i, ret, option = 0, duplex = 0;
+	__le16 addr[ETH_ALEN / 2];
+	void *ring_space;
+	dma_addr_t ring_dma;
+
+/* when built into the kernel, we only print version if device is found */
+#ifndef MODULE
+	pr_info_once("%s%s\n", version, version2);
+#endif
+
+	card_idx++;
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto out;
+
+	if (pci_resource_len(pdev, 0) < EPIC_TOTAL_SIZE) {
+		dev_err(&pdev->dev, "no PCI region space\n");
+		ret = -ENODEV;
+		goto err_out_disable;
+	}
+
+	pci_set_master(pdev);
+
+	ret = pci_request_regions(pdev, DRV_NAME);
+	if (ret < 0)
+		goto err_out_disable;
+
+	ret = -ENOMEM;
+
+	dev = alloc_etherdev(sizeof (*ep));
+	if (!dev)
+		goto err_out_free_res;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	ioaddr = pci_iomap(pdev, EPIC_BAR, 0);
+	if (!ioaddr) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		goto err_out_free_netdev;
+	}
+
+	pci_set_drvdata(pdev, dev);
+	ep = netdev_priv(dev);
+	ep->ioaddr = ioaddr;
+	ep->mii.dev = dev;
+	ep->mii.mdio_read = mdio_read;
+	ep->mii.mdio_write = mdio_write;
+	ep->mii.phy_id_mask = 0x1f;
+	ep->mii.reg_num_mask = 0x1f;
+
+	ring_space = dma_alloc_coherent(&pdev->dev, TX_TOTAL_SIZE, &ring_dma,
+					GFP_KERNEL);
+	if (!ring_space)
+		goto err_out_iounmap;
+	ep->tx_ring = ring_space;
+	ep->tx_ring_dma = ring_dma;
+
+	ring_space = dma_alloc_coherent(&pdev->dev, RX_TOTAL_SIZE, &ring_dma,
+					GFP_KERNEL);
+	if (!ring_space)
+		goto err_out_unmap_tx;
+	ep->rx_ring = ring_space;
+	ep->rx_ring_dma = ring_dma;
+
+	if (dev->mem_start) {
+		option = dev->mem_start;
+		duplex = (dev->mem_start & 16) ? 1 : 0;
+	} else if (card_idx >= 0  &&  card_idx < MAX_UNITS) {
+		if (options[card_idx] >= 0)
+			option = options[card_idx];
+		if (full_duplex[card_idx] >= 0)
+			duplex = full_duplex[card_idx];
+	}
+
+	spin_lock_init(&ep->lock);
+	spin_lock_init(&ep->napi_lock);
+
+	/* Bring the chip out of low-power mode. */
+	ew32(GENCTL, 0x4200);
+	/* Magic?!  If we don't set this bit the MII interface won't work. */
+	/* This magic is documented in SMSC app note 7.15 */
+	for (i = 16; i > 0; i--)
+		ew32(TEST1, 0x0008);
+
+	/* Turn on the MII transceiver. */
+	ew32(MIICfg, 0x12);
+	if (chip_idx == 1)
+		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
+	ew32(GENCTL, 0x0200);
+
+	/* Note: the '175 does not have a serial EEPROM. */
+	for (i = 0; i < 3; i++)
+		addr[i] = cpu_to_le16(er16(LAN0 + i*4));
+	eth_hw_addr_set(dev, (u8 *)addr);
+
+	if (debug > 2) {
+		dev_dbg(&pdev->dev, "EEPROM contents:\n");
+		for (i = 0; i < 64; i++)
+			pr_cont(" %4.4x%s", read_eeprom(ep, i),
+				   i % 16 == 15 ? "\n" : "");
+	}
+
+	ep->pci_dev = pdev;
+	ep->chip_id = chip_idx;
+	ep->chip_flags = pci_id_tbl[chip_idx].drv_flags;
+	ep->irq_mask =
+		(ep->chip_flags & TYPE2_INTR ?  PCIBusErr175 : PCIBusErr170)
+		 | CntFull | TxUnderrun | EpicNapiEvent;
+
+	/* Find the connected MII xcvrs.
+	   Doing this in open() would allow detecting external xcvrs later, but
+	   takes much time and no cards have external MII. */
+	{
+		int phy, phy_idx = 0;
+		for (phy = 1; phy < 32 && phy_idx < sizeof(ep->phys); phy++) {
+			int mii_status = mdio_read(dev, phy, MII_BMSR);
+			if (mii_status != 0xffff  &&  mii_status != 0x0000) {
+				ep->phys[phy_idx++] = phy;
+				dev_info(&pdev->dev,
+					"MII transceiver #%d control "
+					"%4.4x status %4.4x.\n",
+					phy, mdio_read(dev, phy, 0), mii_status);
+			}
+		}
+		ep->mii_phy_cnt = phy_idx;
+		if (phy_idx != 0) {
+			phy = ep->phys[0];
+			ep->mii.advertising = mdio_read(dev, phy, MII_ADVERTISE);
+			dev_info(&pdev->dev,
+				"Autonegotiation advertising %4.4x link "
+				   "partner %4.4x.\n",
+				   ep->mii.advertising, mdio_read(dev, phy, 5));
+		} else if ( ! (ep->chip_flags & NO_MII)) {
+			dev_warn(&pdev->dev,
+				"***WARNING***: No MII transceiver found!\n");
+			/* Use the known PHY address of the EPII. */
+			ep->phys[0] = 3;
+		}
+		ep->mii.phy_id = ep->phys[0];
+	}
+
+	/* Turn off the MII xcvr (175 only!), leave the chip in low-power mode. */
+	if (ep->chip_flags & MII_PWRDWN)
+		ew32(NVCTL, er32(NVCTL) & ~0x483c);
+	ew32(GENCTL, 0x0008);
+
+	/* The lower four bits are the media type. */
+	if (duplex) {
+		ep->mii.force_media = ep->mii.full_duplex = 1;
+		dev_info(&pdev->dev, "Forced full duplex requested.\n");
+	}
+	dev->if_port = ep->default_port = option;
+
+	/* The Epic-specific entries in the device structure. */
+	dev->netdev_ops = &epic_netdev_ops;
+	dev->ethtool_ops = &netdev_ethtool_ops;
+	dev->watchdog_timeo = TX_TIMEOUT;
+	netif_napi_add(dev, &ep->napi, epic_poll);
+
+	ret = register_netdev(dev);
+	if (ret < 0)
+		goto err_out_unmap_rx;
+
+	netdev_info(dev, "%s at %lx, IRQ %d, %pM\n",
+		    pci_id_tbl[chip_idx].name,
+		    (long)pci_resource_start(pdev, EPIC_BAR), pdev->irq,
+		    dev->dev_addr);
+
+out:
+	return ret;
+
+err_out_unmap_rx:
+	dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring,
+			  ep->rx_ring_dma);
+err_out_unmap_tx:
+	dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring,
+			  ep->tx_ring_dma);
+err_out_iounmap:
+	pci_iounmap(pdev, ioaddr);
+err_out_free_netdev:
+	free_netdev(dev);
+err_out_free_res:
+	pci_release_regions(pdev);
+err_out_disable:
+	pci_disable_device(pdev);
+	goto out;
+}
+
+/* Serial EEPROM section. */
+
+/*  EEPROM_Ctrl bits. */
+#define EE_SHIFT_CLK	0x04	/* EEPROM shift clock. */
+#define EE_CS			0x02	/* EEPROM chip select. */
+#define EE_DATA_WRITE	0x08	/* EEPROM chip data in. */
+#define EE_WRITE_0		0x01
+#define EE_WRITE_1		0x09
+#define EE_DATA_READ	0x10	/* EEPROM chip data out. */
+#define EE_ENB			(0x0001 | EE_CS)
+
+/* Delay between EEPROM clock transitions.
+   This serves to flush the operation to the PCI bus.
+ */
+
+#define eeprom_delay()	er32(EECTL)
+
+/* The EEPROM commands include the alway-set leading bit. */
+#define EE_WRITE_CMD	(5 << 6)
+#define EE_READ64_CMD	(6 << 6)
+#define EE_READ256_CMD	(6 << 8)
+#define EE_ERASE_CMD	(7 << 6)
+
+static void epic_disable_int(struct net_device *dev, struct epic_private *ep)
+{
+	void __iomem *ioaddr = ep->ioaddr;
+
+	ew32(INTMASK, 0x00000000);
+}
+
+static inline void __epic_pci_commit(void __iomem *ioaddr)
+{
+#ifndef USE_IO_OPS
+	er32(INTMASK);
+#endif
+}
+
+static inline void epic_napi_irq_off(struct net_device *dev,
+				     struct epic_private *ep)
+{
+	void __iomem *ioaddr = ep->ioaddr;
+
+	ew32(INTMASK, ep->irq_mask & ~EpicNapiEvent);
+	__epic_pci_commit(ioaddr);
+}
+
+static inline void epic_napi_irq_on(struct net_device *dev,
+				    struct epic_private *ep)
+{
+	void __iomem *ioaddr = ep->ioaddr;
+
+	/* No need to commit possible posted write */
+	ew32(INTMASK, ep->irq_mask | EpicNapiEvent);
+}
+
+static int read_eeprom(struct epic_private *ep, int location)
+{
+	void __iomem *ioaddr = ep->ioaddr;
+	int i;
+	int retval = 0;
+	int read_cmd = location |
+		(er32(EECTL) & 0x40 ? EE_READ64_CMD : EE_READ256_CMD);
+
+	ew32(EECTL, EE_ENB & ~EE_CS);
+	ew32(EECTL, EE_ENB);
+
+	/* Shift the read command bits out. */
+	for (i = 12; i >= 0; i--) {
+		short dataval = (read_cmd & (1 << i)) ? EE_WRITE_1 : EE_WRITE_0;
+		ew32(EECTL, EE_ENB | dataval);
+		eeprom_delay();
+		ew32(EECTL, EE_ENB | dataval | EE_SHIFT_CLK);
+		eeprom_delay();
+	}
+	ew32(EECTL, EE_ENB);
+
+	for (i = 16; i > 0; i--) {
+		ew32(EECTL, EE_ENB | EE_SHIFT_CLK);
+		eeprom_delay();
+		retval = (retval << 1) | ((er32(EECTL) & EE_DATA_READ) ? 1 : 0);
+		ew32(EECTL, EE_ENB);
+		eeprom_delay();
+	}
+
+	/* Terminate the EEPROM access. */
+	ew32(EECTL, EE_ENB & ~EE_CS);
+	return retval;
+}
+
+#define MII_READOP		1
+#define MII_WRITEOP		2
+static int mdio_read(struct net_device *dev, int phy_id, int location)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	int read_cmd = (phy_id << 9) | (location << 4) | MII_READOP;
+	int i;
+
+	ew32(MIICtrl, read_cmd);
+	/* Typical operation takes 25 loops. */
+	for (i = 400; i > 0; i--) {
+		barrier();
+		if ((er32(MIICtrl) & MII_READOP) == 0) {
+			/* Work around read failure bug. */
+			if (phy_id == 1 && location < 6 &&
+			    er16(MIIData) == 0xffff) {
+				ew32(MIICtrl, read_cmd);
+				continue;
+			}
+			return er16(MIIData);
+		}
+	}
+	return 0xffff;
+}
+
+static void mdio_write(struct net_device *dev, int phy_id, int loc, int value)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	int i;
+
+	ew16(MIIData, value);
+	ew32(MIICtrl, (phy_id << 9) | (loc << 4) | MII_WRITEOP);
+	for (i = 10000; i > 0; i--) {
+		barrier();
+		if ((er32(MIICtrl) & MII_WRITEOP) == 0)
+			break;
+	}
+}
+
+
+static int epic_open(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	const int irq = ep->pci_dev->irq;
+	int rc, i;
+
+	/* Soft reset the chip. */
+	ew32(GENCTL, 0x4001);
+
+	napi_enable(&ep->napi);
+	rc = request_irq(irq, epic_interrupt, IRQF_SHARED, dev->name, dev);
+	if (rc) {
+		napi_disable(&ep->napi);
+		return rc;
+	}
+
+	epic_init_ring(dev);
+
+	ew32(GENCTL, 0x4000);
+	/* This magic is documented in SMSC app note 7.15 */
+	for (i = 16; i > 0; i--)
+		ew32(TEST1, 0x0008);
+
+	/* Pull the chip out of low-power mode, enable interrupts, and set for
+	   PCI read multiple.  The MIIcfg setting and strange write order are
+	   required by the details of which bits are reset and the transceiver
+	   wiring on the Ositech CardBus card.
+	*/
+#if 0
+	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
+#endif
+	if (ep->chip_flags & MII_PWRDWN)
+		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
+
+	/* Tell the chip to byteswap descriptors on big-endian hosts */
+#ifdef __BIG_ENDIAN
+	ew32(GENCTL, 0x4432 | (RX_FIFO_THRESH << 8));
+	er32(GENCTL);
+	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
+#else
+	ew32(GENCTL, 0x4412 | (RX_FIFO_THRESH << 8));
+	er32(GENCTL);
+	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
+#endif
+
+	udelay(20); /* Looks like EPII needs that if you want reliable RX init. FIXME: pci posting bug? */
+
+	for (i = 0; i < 3; i++)
+		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
+
+	ep->tx_threshold = TX_FIFO_THRESH;
+	ew32(TxThresh, ep->tx_threshold);
+
+	if (media2miictl[dev->if_port & 15]) {
+		if (ep->mii_phy_cnt)
+			mdio_write(dev, ep->phys[0], MII_BMCR, media2miictl[dev->if_port&15]);
+		if (dev->if_port == 1) {
+			if (debug > 1)
+				netdev_info(dev, "Using the 10base2 transceiver, MII status %4.4x.\n",
+					    mdio_read(dev, ep->phys[0], MII_BMSR));
+		}
+	} else {
+		int mii_lpa = mdio_read(dev, ep->phys[0], MII_LPA);
+		if (mii_lpa != 0xffff) {
+			if ((mii_lpa & LPA_100FULL) || (mii_lpa & 0x01C0) == LPA_10FULL)
+				ep->mii.full_duplex = 1;
+			else if (! (mii_lpa & LPA_LPACK))
+				mdio_write(dev, ep->phys[0], MII_BMCR, BMCR_ANENABLE|BMCR_ANRESTART);
+			if (debug > 1)
+				netdev_info(dev, "Setting %s-duplex based on MII xcvr %d register read of %4.4x.\n",
+					    ep->mii.full_duplex ? "full"
+								: "half",
+					    ep->phys[0], mii_lpa);
+		}
+	}
+
+	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
+	ew32(PRxCDAR, ep->rx_ring_dma);
+	ew32(PTxCDAR, ep->tx_ring_dma);
+
+	/* Start the chip's Rx process. */
+	set_rx_mode(dev);
+	ew32(COMMAND, StartRx | RxQueued);
+
+	netif_start_queue(dev);
+
+	/* Enable interrupts by setting the interrupt mask. */
+	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
+	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
+	     TxUnderrun);
+
+	if (debug > 1) {
+		netdev_dbg(dev, "epic_open() ioaddr %p IRQ %d status %4.4x %s-duplex.\n",
+			   ioaddr, irq, er32(GENCTL),
+			   ep->mii.full_duplex ? "full" : "half");
+	}
+
+	/* Set the timer to switch to check for link beat and perhaps switch
+	   to an alternate media type. */
+	timer_setup(&ep->timer, epic_timer, 0);
+	ep->timer.expires = jiffies + 3*HZ;
+	add_timer(&ep->timer);
+
+	return rc;
+}
+
+/* Reset the chip to recover from a PCI transaction error.
+   This may occur at interrupt time. */
+static void epic_pause(struct net_device *dev)
+{
+	struct net_device_stats *stats = &dev->stats;
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	netif_stop_queue (dev);
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	ew32(INTMASK, 0x00000000);
+	/* Stop the chip's Tx and Rx DMA processes. */
+	ew16(COMMAND, StopRx | StopTxDMA | StopRxDMA);
+
+	/* Update the error counts. */
+	if (er16(COMMAND) != 0xffff) {
+		stats->rx_missed_errors	+= er8(MPCNT);
+		stats->rx_frame_errors	+= er8(ALICNT);
+		stats->rx_crc_errors	+= er8(CRCCNT);
+	}
+
+	/* Remove the packets on the Rx queue. */
+	epic_rx(dev, RX_RING_SIZE);
+}
+
+static void epic_restart(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	int i;
+
+	/* Soft reset the chip. */
+	ew32(GENCTL, 0x4001);
+
+	netdev_dbg(dev, "Restarting the EPIC chip, Rx %d/%d Tx %d/%d.\n",
+		   ep->cur_rx, ep->dirty_rx, ep->dirty_tx, ep->cur_tx);
+	udelay(1);
+
+	/* This magic is documented in SMSC app note 7.15 */
+	for (i = 16; i > 0; i--)
+		ew32(TEST1, 0x0008);
+
+#ifdef __BIG_ENDIAN
+	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
+#else
+	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
+#endif
+	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
+	if (ep->chip_flags & MII_PWRDWN)
+		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
+
+	for (i = 0; i < 3; i++)
+		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
+
+	ep->tx_threshold = TX_FIFO_THRESH;
+	ew32(TxThresh, ep->tx_threshold);
+	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
+	ew32(PRxCDAR, ep->rx_ring_dma +
+	     (ep->cur_rx % RX_RING_SIZE) * sizeof(struct epic_rx_desc));
+	ew32(PTxCDAR, ep->tx_ring_dma +
+	     (ep->dirty_tx % TX_RING_SIZE) * sizeof(struct epic_tx_desc));
+
+	/* Start the chip's Rx process. */
+	set_rx_mode(dev);
+	ew32(COMMAND, StartRx | RxQueued);
+
+	/* Enable interrupts by setting the interrupt mask. */
+	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
+	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
+	     TxUnderrun);
+
+	netdev_dbg(dev, "epic_restart() done, cmd status %4.4x, ctl %4.4x interrupt %4.4x.\n",
+		   er32(COMMAND), er32(GENCTL), er32(INTSTAT));
+}
+
+static void check_media(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	int mii_lpa = ep->mii_phy_cnt ? mdio_read(dev, ep->phys[0], MII_LPA) : 0;
+	int negotiated = mii_lpa & ep->mii.advertising;
+	int duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
+
+	if (ep->mii.force_media)
+		return;
+	if (mii_lpa == 0xffff)		/* Bogus read */
+		return;
+	if (ep->mii.full_duplex != duplex) {
+		ep->mii.full_duplex = duplex;
+		netdev_info(dev, "Setting %s-duplex based on MII #%d link partner capability of %4.4x.\n",
+			    ep->mii.full_duplex ? "full" : "half",
+			    ep->phys[0], mii_lpa);
+		ew32(TxCtrl, ep->mii.full_duplex ? 0x7F : 0x79);
+	}
+}
+
+static void epic_timer(struct timer_list *t)
+{
+	struct epic_private *ep = from_timer(ep, t, timer);
+	struct net_device *dev = ep->mii.dev;
+	void __iomem *ioaddr = ep->ioaddr;
+	int next_tick = 5*HZ;
+
+	if (debug > 3) {
+		netdev_dbg(dev, "Media monitor tick, Tx status %8.8x.\n",
+			   er32(TxSTAT));
+		netdev_dbg(dev, "Other registers are IntMask %4.4x IntStatus %4.4x RxStatus %4.4x.\n",
+			   er32(INTMASK), er32(INTSTAT), er32(RxSTAT));
+	}
+
+	check_media(dev);
+
+	ep->timer.expires = jiffies + next_tick;
+	add_timer(&ep->timer);
+}
+
+static void epic_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	if (debug > 0) {
+		netdev_warn(dev, "Transmit timeout using MII device, Tx status %4.4x.\n",
+			    er16(TxSTAT));
+		if (debug > 1) {
+			netdev_dbg(dev, "Tx indices: dirty_tx %d, cur_tx %d.\n",
+				   ep->dirty_tx, ep->cur_tx);
+		}
+	}
+	if (er16(TxSTAT) & 0x10) {		/* Tx FIFO underflow. */
+		dev->stats.tx_fifo_errors++;
+		ew32(COMMAND, RestartTx);
+	} else {
+		epic_restart(dev);
+		ew32(COMMAND, TxQueued);
+	}
+
+	netif_trans_update(dev); /* prevent tx timeout */
+	dev->stats.tx_errors++;
+	if (!ep->tx_full)
+		netif_wake_queue(dev);
+}
+
+/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
+static void epic_init_ring(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	int i;
+
+	ep->tx_full = 0;
+	ep->dirty_tx = ep->cur_tx = 0;
+	ep->cur_rx = ep->dirty_rx = 0;
+	ep->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
+
+	/* Initialize all Rx descriptors. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		ep->rx_ring[i].rxstatus = 0;
+		ep->rx_ring[i].buflength = ep->rx_buf_sz;
+		ep->rx_ring[i].next = ep->rx_ring_dma +
+				      (i+1)*sizeof(struct epic_rx_desc);
+		ep->rx_skbuff[i] = NULL;
+	}
+	/* Mark the last entry as wrapping the ring. */
+	ep->rx_ring[i-1].next = ep->rx_ring_dma;
+
+	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
+		ep->rx_skbuff[i] = skb;
+		if (skb == NULL)
+			break;
+		skb_reserve(skb, 2);	/* 16 byte align the IP header. */
+		ep->rx_ring[i].bufaddr = dma_map_single(&ep->pci_dev->dev,
+							skb->data,
+							ep->rx_buf_sz,
+							DMA_FROM_DEVICE);
+		ep->rx_ring[i].rxstatus = DescOwn;
+	}
+	ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
+
+	/* The Tx buffer descriptor is filled in as needed, but we
+	   do need to clear the ownership bit. */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		ep->tx_skbuff[i] = NULL;
+		ep->tx_ring[i].txstatus = 0x0000;
+		ep->tx_ring[i].next = ep->tx_ring_dma +
+			(i+1)*sizeof(struct epic_tx_desc);
+	}
+	ep->tx_ring[i-1].next = ep->tx_ring_dma;
+}
+
+static netdev_tx_t epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	int entry, free_count;
+	u32 ctrl_word;
+	unsigned long flags;
+
+	if (skb_padto(skb, ETH_ZLEN))
+		return NETDEV_TX_OK;
+
+	/* Caution: the write order is important here, set the field with the
+	   "ownership" bit last. */
+
+	/* Calculate the next Tx descriptor entry. */
+	spin_lock_irqsave(&ep->lock, flags);
+	free_count = ep->cur_tx - ep->dirty_tx;
+	entry = ep->cur_tx % TX_RING_SIZE;
+
+	ep->tx_skbuff[entry] = skb;
+	ep->tx_ring[entry].bufaddr = dma_map_single(&ep->pci_dev->dev,
+						    skb->data, skb->len,
+						    DMA_TO_DEVICE);
+	if (free_count < TX_QUEUE_LEN/2) {/* Typical path */
+		ctrl_word = 0x100000; /* No interrupt */
+	} else if (free_count == TX_QUEUE_LEN/2) {
+		ctrl_word = 0x140000; /* Tx-done intr. */
+	} else if (free_count < TX_QUEUE_LEN - 1) {
+		ctrl_word = 0x100000; /* No Tx-done intr. */
+	} else {
+		/* Leave room for an additional entry. */
+		ctrl_word = 0x140000; /* Tx-done intr. */
+		ep->tx_full = 1;
+	}
+	ep->tx_ring[entry].buflength = ctrl_word | skb->len;
+	ep->tx_ring[entry].txstatus =
+		((skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN) << 16)
+			    | DescOwn;
+
+	ep->cur_tx++;
+	if (ep->tx_full)
+		netif_stop_queue(dev);
+
+	spin_unlock_irqrestore(&ep->lock, flags);
+	/* Trigger an immediate transmit demand. */
+	ew32(COMMAND, TxQueued);
+
+	if (debug > 4)
+		netdev_dbg(dev, "Queued Tx packet size %d to slot %d, flag %2.2x Tx status %8.8x.\n",
+			   skb->len, entry, ctrl_word, er32(TxSTAT));
+
+	return NETDEV_TX_OK;
+}
+
+static void epic_tx_error(struct net_device *dev, struct epic_private *ep,
+			  int status)
+{
+	struct net_device_stats *stats = &dev->stats;
+
+#ifndef final_version
+	/* There was an major error, log it. */
+	if (debug > 1)
+		netdev_dbg(dev, "Transmit error, Tx status %8.8x.\n",
+			   status);
+#endif
+	stats->tx_errors++;
+	if (status & 0x1050)
+		stats->tx_aborted_errors++;
+	if (status & 0x0008)
+		stats->tx_carrier_errors++;
+	if (status & 0x0040)
+		stats->tx_window_errors++;
+	if (status & 0x0010)
+		stats->tx_fifo_errors++;
+}
+
+static void epic_tx(struct net_device *dev, struct epic_private *ep)
+{
+	unsigned int dirty_tx, cur_tx;
+
+	/*
+	 * Note: if this lock becomes a problem we can narrow the locked
+	 * region at the cost of occasionally grabbing the lock more times.
+	 */
+	cur_tx = ep->cur_tx;
+	for (dirty_tx = ep->dirty_tx; cur_tx - dirty_tx > 0; dirty_tx++) {
+		struct sk_buff *skb;
+		int entry = dirty_tx % TX_RING_SIZE;
+		int txstatus = ep->tx_ring[entry].txstatus;
+
+		if (txstatus & DescOwn)
+			break;	/* It still hasn't been Txed */
+
+		if (likely(txstatus & 0x0001)) {
+			dev->stats.collisions += (txstatus >> 8) & 15;
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes += ep->tx_skbuff[entry]->len;
+		} else
+			epic_tx_error(dev, ep, txstatus);
+
+		/* Free the original skb. */
+		skb = ep->tx_skbuff[entry];
+		dma_unmap_single(&ep->pci_dev->dev,
+				 ep->tx_ring[entry].bufaddr, skb->len,
+				 DMA_TO_DEVICE);
+		dev_consume_skb_irq(skb);
+		ep->tx_skbuff[entry] = NULL;
+	}
+
+#ifndef final_version
+	if (cur_tx - dirty_tx > TX_RING_SIZE) {
+		netdev_warn(dev, "Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
+			    dirty_tx, cur_tx, ep->tx_full);
+		dirty_tx += TX_RING_SIZE;
+	}
+#endif
+	ep->dirty_tx = dirty_tx;
+	if (ep->tx_full && cur_tx - dirty_tx < TX_QUEUE_LEN - 4) {
+		/* The ring is no longer full, allow new TX entries. */
+		ep->tx_full = 0;
+		netif_wake_queue(dev);
+	}
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static irqreturn_t epic_interrupt(int irq, void *dev_instance)
+{
+	struct net_device *dev = dev_instance;
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	unsigned int handled = 0;
+	int status;
+
+	status = er32(INTSTAT);
+	/* Acknowledge all of the current interrupt sources ASAP. */
+	ew32(INTSTAT, status & EpicNormalEvent);
+
+	if (debug > 4) {
+		netdev_dbg(dev, "Interrupt, status=%#8.8x new intstat=%#8.8x.\n",
+			   status, er32(INTSTAT));
+	}
+
+	if ((status & IntrSummary) == 0)
+		goto out;
+
+	handled = 1;
+
+	if (status & EpicNapiEvent) {
+		spin_lock(&ep->napi_lock);
+		if (napi_schedule_prep(&ep->napi)) {
+			epic_napi_irq_off(dev, ep);
+			__napi_schedule(&ep->napi);
+		}
+		spin_unlock(&ep->napi_lock);
+	}
+	status &= ~EpicNapiEvent;
+
+	/* Check uncommon events all at once. */
+	if (status & (CntFull | TxUnderrun | PCIBusErr170 | PCIBusErr175)) {
+		struct net_device_stats *stats = &dev->stats;
+
+		if (status == EpicRemoved)
+			goto out;
+
+		/* Always update the error counts to avoid overhead later. */
+		stats->rx_missed_errors	+= er8(MPCNT);
+		stats->rx_frame_errors	+= er8(ALICNT);
+		stats->rx_crc_errors	+= er8(CRCCNT);
+
+		if (status & TxUnderrun) { /* Tx FIFO underflow. */
+			stats->tx_fifo_errors++;
+			ew32(TxThresh, ep->tx_threshold += 128);
+			/* Restart the transmit process. */
+			ew32(COMMAND, RestartTx);
+		}
+		if (status & PCIBusErr170) {
+			netdev_err(dev, "PCI Bus Error! status %4.4x.\n",
+				   status);
+			epic_pause(dev);
+			epic_restart(dev);
+		}
+		/* Clear all error sources. */
+		ew32(INTSTAT, status & 0x7f18);
+	}
+
+out:
+	if (debug > 3) {
+		netdev_dbg(dev, "exit interrupt, intr_status=%#4.4x.\n",
+			   status);
+	}
+
+	return IRQ_RETVAL(handled);
+}
+
+static int epic_rx(struct net_device *dev, int budget)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	int entry = ep->cur_rx % RX_RING_SIZE;
+	int rx_work_limit = ep->dirty_rx + RX_RING_SIZE - ep->cur_rx;
+	int work_done = 0;
+
+	if (debug > 4)
+		netdev_dbg(dev, " In epic_rx(), entry %d %8.8x.\n", entry,
+			   ep->rx_ring[entry].rxstatus);
+
+	if (rx_work_limit > budget)
+		rx_work_limit = budget;
+
+	/* If we own the next entry, it's a new packet. Send it up. */
+	while ((ep->rx_ring[entry].rxstatus & DescOwn) == 0) {
+		int status = ep->rx_ring[entry].rxstatus;
+
+		if (debug > 4)
+			netdev_dbg(dev, "  epic_rx() status was %8.8x.\n",
+				   status);
+		if (--rx_work_limit < 0)
+			break;
+		if (status & 0x2006) {
+			if (debug > 2)
+				netdev_dbg(dev, "epic_rx() error status was %8.8x.\n",
+					   status);
+			if (status & 0x2000) {
+				netdev_warn(dev, "Oversized Ethernet frame spanned multiple buffers, status %4.4x!\n",
+					    status);
+				dev->stats.rx_length_errors++;
+			} else if (status & 0x0006)
+				/* Rx Frame errors are counted in hardware. */
+				dev->stats.rx_errors++;
+		} else {
+			/* Malloc up new buffer, compatible with net-2e. */
+			/* Omit the four octet CRC from the length. */
+			short pkt_len = (status >> 16) - 4;
+			struct sk_buff *skb;
+
+			if (pkt_len > PKT_BUF_SZ - 4) {
+				netdev_err(dev, "Oversized Ethernet frame, status %x %d bytes.\n",
+					   status, pkt_len);
+				pkt_len = 1514;
+			}
+			/* Check if the packet is long enough to accept without copying
+			   to a minimally-sized skbuff. */
+			if (pkt_len < rx_copybreak &&
+			    (skb = netdev_alloc_skb(dev, pkt_len + 2)) != NULL) {
+				skb_reserve(skb, 2);	/* 16 byte align the IP header */
+				dma_sync_single_for_cpu(&ep->pci_dev->dev,
+							ep->rx_ring[entry].bufaddr,
+							ep->rx_buf_sz,
+							DMA_FROM_DEVICE);
+				skb_copy_to_linear_data(skb, ep->rx_skbuff[entry]->data, pkt_len);
+				skb_put(skb, pkt_len);
+				dma_sync_single_for_device(&ep->pci_dev->dev,
+							   ep->rx_ring[entry].bufaddr,
+							   ep->rx_buf_sz,
+							   DMA_FROM_DEVICE);
+			} else {
+				dma_unmap_single(&ep->pci_dev->dev,
+						 ep->rx_ring[entry].bufaddr,
+						 ep->rx_buf_sz,
+						 DMA_FROM_DEVICE);
+				skb_put(skb = ep->rx_skbuff[entry], pkt_len);
+				ep->rx_skbuff[entry] = NULL;
+			}
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_receive_skb(skb);
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += pkt_len;
+		}
+		work_done++;
+		entry = (++ep->cur_rx) % RX_RING_SIZE;
+	}
+
+	/* Refill the Rx ring buffers. */
+	for (; ep->cur_rx - ep->dirty_rx > 0; ep->dirty_rx++) {
+		entry = ep->dirty_rx % RX_RING_SIZE;
+		if (ep->rx_skbuff[entry] == NULL) {
+			struct sk_buff *skb;
+			skb = ep->rx_skbuff[entry] = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
+			if (skb == NULL)
+				break;
+			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
+			ep->rx_ring[entry].bufaddr = dma_map_single(&ep->pci_dev->dev,
+								    skb->data,
+								    ep->rx_buf_sz,
+								    DMA_FROM_DEVICE);
+			work_done++;
+		}
+		/* AV: shouldn't we add a barrier here? */
+		ep->rx_ring[entry].rxstatus = DescOwn;
+	}
+	return work_done;
+}
+
+static void epic_rx_err(struct net_device *dev, struct epic_private *ep)
+{
+	void __iomem *ioaddr = ep->ioaddr;
+	int status;
+
+	status = er32(INTSTAT);
+
+	if (status == EpicRemoved)
+		return;
+	if (status & RxOverflow) 	/* Missed a Rx frame. */
+		dev->stats.rx_errors++;
+	if (status & (RxOverflow | RxFull))
+		ew16(COMMAND, RxQueued);
+}
+
+static int epic_poll(struct napi_struct *napi, int budget)
+{
+	struct epic_private *ep = container_of(napi, struct epic_private, napi);
+	struct net_device *dev = ep->mii.dev;
+	void __iomem *ioaddr = ep->ioaddr;
+	int work_done;
+
+	epic_tx(dev, ep);
+
+	work_done = epic_rx(dev, budget);
+
+	epic_rx_err(dev, ep);
+
+	if (work_done < budget && napi_complete_done(napi, work_done)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&ep->napi_lock, flags);
+
+		ew32(INTSTAT, EpicNapiEvent);
+		epic_napi_irq_on(dev, ep);
+		spin_unlock_irqrestore(&ep->napi_lock, flags);
+	}
+
+	return work_done;
+}
+
+static int epic_close(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	struct pci_dev *pdev = ep->pci_dev;
+	void __iomem *ioaddr = ep->ioaddr;
+	struct sk_buff *skb;
+	int i;
+
+	netif_stop_queue(dev);
+	napi_disable(&ep->napi);
+
+	if (debug > 1)
+		netdev_dbg(dev, "Shutting down ethercard, status was %2.2x.\n",
+			   er32(INTSTAT));
+
+	del_timer_sync(&ep->timer);
+
+	epic_disable_int(dev, ep);
+
+	free_irq(pdev->irq, dev);
+
+	epic_pause(dev);
+
+	/* Free all the skbuffs in the Rx queue. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		skb = ep->rx_skbuff[i];
+		ep->rx_skbuff[i] = NULL;
+		ep->rx_ring[i].rxstatus = 0;		/* Not owned by Epic chip. */
+		ep->rx_ring[i].buflength = 0;
+		if (skb) {
+			dma_unmap_single(&pdev->dev, ep->rx_ring[i].bufaddr,
+					 ep->rx_buf_sz, DMA_FROM_DEVICE);
+			dev_kfree_skb(skb);
+		}
+		ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
+	}
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		skb = ep->tx_skbuff[i];
+		ep->tx_skbuff[i] = NULL;
+		if (!skb)
+			continue;
+		dma_unmap_single(&pdev->dev, ep->tx_ring[i].bufaddr, skb->len,
+				 DMA_TO_DEVICE);
+		dev_kfree_skb(skb);
+	}
+
+	/* Green! Leave the chip in low-power mode. */
+	ew32(GENCTL, 0x0008);
+
+	return 0;
+}
+
+static struct net_device_stats *epic_get_stats(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	if (netif_running(dev)) {
+		struct net_device_stats *stats = &dev->stats;
+
+		stats->rx_missed_errors	+= er8(MPCNT);
+		stats->rx_frame_errors	+= er8(ALICNT);
+		stats->rx_crc_errors	+= er8(CRCCNT);
+	}
+
+	return &dev->stats;
+}
+
+/* Set or clear the multicast filter for this adaptor.
+   Note that we only use exclusion around actually queueing the
+   new frame, not around filling ep->setup_frame.  This is non-deterministic
+   when re-entered but still correct. */
+
+static void set_rx_mode(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+	unsigned char mc_filter[8];		 /* Multicast hash filter */
+	int i;
+
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
+		ew32(RxCtrl, 0x002c);
+		/* Unconditionally log net taps. */
+		memset(mc_filter, 0xff, sizeof(mc_filter));
+	} else if ((!netdev_mc_empty(dev)) || (dev->flags & IFF_ALLMULTI)) {
+		/* There is apparently a chip bug, so the multicast filter
+		   is never enabled. */
+		/* Too many to filter perfectly -- accept all multicasts. */
+		memset(mc_filter, 0xff, sizeof(mc_filter));
+		ew32(RxCtrl, 0x000c);
+	} else if (netdev_mc_empty(dev)) {
+		ew32(RxCtrl, 0x0004);
+		return;
+	} else {					/* Never executed, for now. */
+		struct netdev_hw_addr *ha;
+
+		memset(mc_filter, 0, sizeof(mc_filter));
+		netdev_for_each_mc_addr(ha, dev) {
+			unsigned int bit_nr =
+				ether_crc_le(ETH_ALEN, ha->addr) & 0x3f;
+			mc_filter[bit_nr >> 3] |= (1 << bit_nr);
+		}
+	}
+	/* ToDo: perhaps we need to stop the Tx and Rx process here? */
+	if (memcmp(mc_filter, ep->mc_filter, sizeof(mc_filter))) {
+		for (i = 0; i < 4; i++)
+			ew16(MC0 + i*4, ((u16 *)mc_filter)[i]);
+		memcpy(ep->mc_filter, mc_filter, sizeof(mc_filter));
+	}
+}
+
+static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	struct epic_private *np = netdev_priv(dev);
+
+	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strscpy(info->version, DRV_VERSION, sizeof(info->version));
+	strscpy(info->bus_info, pci_name(np->pci_dev), sizeof(info->bus_info));
+}
+
+static int netdev_get_link_ksettings(struct net_device *dev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct epic_private *np = netdev_priv(dev);
+
+	spin_lock_irq(&np->lock);
+	mii_ethtool_get_link_ksettings(&np->mii, cmd);
+	spin_unlock_irq(&np->lock);
+
+	return 0;
+}
+
+static int netdev_set_link_ksettings(struct net_device *dev,
+				     const struct ethtool_link_ksettings *cmd)
+{
+	struct epic_private *np = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&np->lock);
+	rc = mii_ethtool_set_link_ksettings(&np->mii, cmd);
+	spin_unlock_irq(&np->lock);
+
+	return rc;
+}
+
+static int netdev_nway_reset(struct net_device *dev)
+{
+	struct epic_private *np = netdev_priv(dev);
+	return mii_nway_restart(&np->mii);
+}
+
+static u32 netdev_get_link(struct net_device *dev)
+{
+	struct epic_private *np = netdev_priv(dev);
+	return mii_link_ok(&np->mii);
+}
+
+static u32 netdev_get_msglevel(struct net_device *dev)
+{
+	return debug;
+}
+
+static void netdev_set_msglevel(struct net_device *dev, u32 value)
+{
+	debug = value;
+}
+
+static int ethtool_begin(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	if (ep->ethtool_ops_nesting == U32_MAX)
+		return -EBUSY;
+	/* power-up, if interface is down */
+	if (!ep->ethtool_ops_nesting++ && !netif_running(dev)) {
+		ew32(GENCTL, 0x0200);
+		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
+	}
+	return 0;
+}
+
+static void ethtool_complete(struct net_device *dev)
+{
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	/* power-down, if interface is down */
+	if (!--ep->ethtool_ops_nesting && !netif_running(dev)) {
+		ew32(GENCTL, 0x0008);
+		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
+	}
+}
+
+static const struct ethtool_ops netdev_ethtool_ops = {
+	.get_drvinfo		= netdev_get_drvinfo,
+	.nway_reset		= netdev_nway_reset,
+	.get_link		= netdev_get_link,
+	.get_msglevel		= netdev_get_msglevel,
+	.set_msglevel		= netdev_set_msglevel,
+	.begin			= ethtool_begin,
+	.complete		= ethtool_complete,
+	.get_link_ksettings	= netdev_get_link_ksettings,
+	.set_link_ksettings	= netdev_set_link_ksettings,
+};
+
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct epic_private *np = netdev_priv(dev);
+	void __iomem *ioaddr = np->ioaddr;
+	struct mii_ioctl_data *data = if_mii(rq);
+	int rc;
+
+	/* power-up, if interface is down */
+	if (! netif_running(dev)) {
+		ew32(GENCTL, 0x0200);
+		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
+	}
+
+	/* all non-ethtool ioctls (the SIOC[GS]MIIxxx ioctls) */
+	spin_lock_irq(&np->lock);
+	rc = generic_mii_ioctl(&np->mii, data, cmd, NULL);
+	spin_unlock_irq(&np->lock);
+
+	/* power-down, if interface is down */
+	if (! netif_running(dev)) {
+		ew32(GENCTL, 0x0008);
+		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
+	}
+	return rc;
+}
+
+
+static void epic_remove_one(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct epic_private *ep = netdev_priv(dev);
+
+	unregister_netdev(dev);
+	dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring,
+			  ep->tx_ring_dma);
+	dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring,
+			  ep->rx_ring_dma);
+	pci_iounmap(pdev, ep->ioaddr);
+	free_netdev(dev);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	/* pci_power_off(pdev, -1); */
+}
+
+static int __maybe_unused epic_suspend(struct device *dev_d)
+{
+	struct net_device *dev = dev_get_drvdata(dev_d);
+	struct epic_private *ep = netdev_priv(dev);
+	void __iomem *ioaddr = ep->ioaddr;
+
+	if (!netif_running(dev))
+		return 0;
+	epic_pause(dev);
+	/* Put the chip into low-power mode. */
+	ew32(GENCTL, 0x0008);
+	/* pci_power_off(pdev, -1); */
+	return 0;
+}
+
+
+static int __maybe_unused epic_resume(struct device *dev_d)
+{
+	struct net_device *dev = dev_get_drvdata(dev_d);
+
+	if (!netif_running(dev))
+		return 0;
+	epic_restart(dev);
+	/* pci_power_on(pdev); */
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(epic_pm_ops, epic_suspend, epic_resume);
+
+static struct pci_driver epic_driver = {
+	.name		= DRV_NAME,
+	.id_table	= epic_pci_tbl,
+	.probe		= epic_init_one,
+	.remove		= epic_remove_one,
+	.driver.pm	= &epic_pm_ops,
+};
+
+
+static int __init epic_init (void)
+{
+/* when a module, this is printed whether or not devices are found in probe */
+#ifdef MODULE
+	pr_info("%s%s\n", version, version2);
+#endif
+
+	return pci_register_driver(&epic_driver);
+}
+
+
+static void __exit epic_cleanup (void)
+{
+	pci_unregister_driver (&epic_driver);
+}
+
+
+module_init(epic_init);
+module_exit(epic_cleanup);