ewrk3/tulip: Move the DEC - Tulip drivers

Move the DEC - Tulip driver into drivers/net/ethernet/dec/tulip/
and make the necessary Kconfig and Makefile changes.

The Digital Equioment (DEC) driver ewrk3 was moved into
drivers/net/ethernet/dec/ and the remaining drivers (Tulip)
were moved into drivers/net/ethernet/dec/tulip/

CC: Tobias Ringstrom <tori@unhappy.mine.nu>
CC: Grant Grundler <grundler@parisc-linux.org>
CC: David Davies <davies@maniac.ultranet.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Grant Grundler <grundler@parisc-linux.org>

1 files changed, 2215 insertions, 0 deletions

diff --git a/drivers/net/ethernet/dec/tulip/de2104x.c b/drivers/net/ethernet/dec/tulip/de2104x.c
new file mode 100644
index 000000000000..ce90efc6ba3c
--- /dev/null
+++ b/drivers/net/ethernet/dec/tulip/de2104x.c
@@ -0,0 +1,2215 @@
+/* de2104x.c: A Linux PCI Ethernet driver for Intel/Digital 21040/1 chips. */
+/*
+	Copyright 2001,2003 Jeff Garzik <jgarzik@pobox.com>
+
+	Copyright 1994, 1995 Digital Equipment Corporation.	    [de4x5.c]
+	Written/copyright 1994-2001 by Donald Becker.		    [tulip.c]
+
+	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.
+
+	See the file COPYING in this distribution for more information.
+
+	TODO, in rough priority order:
+	* Support forcing media type with a module parameter,
+	  like dl2k.c/sundance.c
+	* Constants (module parms?) for Rx work limit
+	* Complete reset on PciErr
+	* Jumbo frames / dev->change_mtu
+	* Adjust Rx FIFO threshold and Max Rx DMA burst on Rx FIFO error
+	* Adjust Tx FIFO threshold and Max Tx DMA burst on Tx FIFO error
+	* Implement Tx software interrupt mitigation via
+	  Tx descriptor bit
+
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DRV_NAME		"de2104x"
+#define DRV_VERSION		"0.7"
+#define DRV_RELDATE		"Mar 17, 2004"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/compiler.h>
+#include <linux/rtnetlink.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+
+/* These identify the driver base version and may not be removed. */
+static char version[] =
+"PCI Ethernet driver v" DRV_VERSION " (" DRV_RELDATE ")";
+
+MODULE_AUTHOR("Jeff Garzik <jgarzik@pobox.com>");
+MODULE_DESCRIPTION("Intel/Digital 21040/1 series PCI Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static int debug = -1;
+module_param (debug, int, 0);
+MODULE_PARM_DESC (debug, "de2104x bitmapped message enable number");
+
+/* Set the copy breakpoint for the copy-only-tiny-buffer Rx structure. */
+#if defined(__alpha__) || defined(__arm__) || defined(__hppa__) || \
+        defined(CONFIG_SPARC) || defined(__ia64__) ||		   \
+        defined(__sh__) || defined(__mips__)
+static int rx_copybreak = 1518;
+#else
+static int rx_copybreak = 100;
+#endif
+module_param (rx_copybreak, int, 0);
+MODULE_PARM_DESC (rx_copybreak, "de2104x Breakpoint at which Rx packets are copied");
+
+#define DE_DEF_MSG_ENABLE	(NETIF_MSG_DRV		| \
+				 NETIF_MSG_PROBE 	| \
+				 NETIF_MSG_LINK		| \
+				 NETIF_MSG_IFDOWN	| \
+				 NETIF_MSG_IFUP		| \
+				 NETIF_MSG_RX_ERR	| \
+				 NETIF_MSG_TX_ERR)
+
+/* Descriptor skip length in 32 bit longwords. */
+#ifndef CONFIG_DE2104X_DSL
+#define DSL			0
+#else
+#define DSL			CONFIG_DE2104X_DSL
+#endif
+
+#define DE_RX_RING_SIZE		64
+#define DE_TX_RING_SIZE		64
+#define DE_RING_BYTES		\
+		((sizeof(struct de_desc) * DE_RX_RING_SIZE) +	\
+		(sizeof(struct de_desc) * DE_TX_RING_SIZE))
+#define NEXT_TX(N)		(((N) + 1) & (DE_TX_RING_SIZE - 1))
+#define NEXT_RX(N)		(((N) + 1) & (DE_RX_RING_SIZE - 1))
+#define TX_BUFFS_AVAIL(CP)					\
+	(((CP)->tx_tail <= (CP)->tx_head) ?			\
+	  (CP)->tx_tail + (DE_TX_RING_SIZE - 1) - (CP)->tx_head :	\
+	  (CP)->tx_tail - (CP)->tx_head - 1)
+
+#define PKT_BUF_SZ		1536	/* Size of each temporary Rx buffer.*/
+#define RX_OFFSET		2
+
+#define DE_SETUP_SKB		((struct sk_buff *) 1)
+#define DE_DUMMY_SKB		((struct sk_buff *) 2)
+#define DE_SETUP_FRAME_WORDS	96
+#define DE_EEPROM_WORDS		256
+#define DE_EEPROM_SIZE		(DE_EEPROM_WORDS * sizeof(u16))
+#define DE_MAX_MEDIA		5
+
+#define DE_MEDIA_TP_AUTO	0
+#define DE_MEDIA_BNC		1
+#define DE_MEDIA_AUI		2
+#define DE_MEDIA_TP		3
+#define DE_MEDIA_TP_FD		4
+#define DE_MEDIA_INVALID	DE_MAX_MEDIA
+#define DE_MEDIA_FIRST		0
+#define DE_MEDIA_LAST		(DE_MAX_MEDIA - 1)
+#define DE_AUI_BNC		(SUPPORTED_AUI | SUPPORTED_BNC)
+
+#define DE_TIMER_LINK		(60 * HZ)
+#define DE_TIMER_NO_LINK	(5 * HZ)
+
+#define DE_NUM_REGS		16
+#define DE_REGS_SIZE		(DE_NUM_REGS * sizeof(u32))
+#define DE_REGS_VER		1
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT		(6*HZ)
+
+/* This is a mysterious value that can be written to CSR11 in the 21040 (only)
+   to support a pre-NWay full-duplex signaling mechanism using short frames.
+   No one knows what it should be, but if left at its default value some
+   10base2(!) packets trigger a full-duplex-request interrupt. */
+#define FULL_DUPLEX_MAGIC	0x6969
+
+enum {
+	/* NIC registers */
+	BusMode			= 0x00,
+	TxPoll			= 0x08,
+	RxPoll			= 0x10,
+	RxRingAddr		= 0x18,
+	TxRingAddr		= 0x20,
+	MacStatus		= 0x28,
+	MacMode			= 0x30,
+	IntrMask		= 0x38,
+	RxMissed		= 0x40,
+	ROMCmd			= 0x48,
+	CSR11			= 0x58,
+	SIAStatus		= 0x60,
+	CSR13			= 0x68,
+	CSR14			= 0x70,
+	CSR15			= 0x78,
+	PCIPM			= 0x40,
+
+	/* BusMode bits */
+	CmdReset		= (1 << 0),
+	CacheAlign16		= 0x00008000,
+	BurstLen4		= 0x00000400,
+	DescSkipLen		= (DSL << 2),
+
+	/* Rx/TxPoll bits */
+	NormalTxPoll		= (1 << 0),
+	NormalRxPoll		= (1 << 0),
+
+	/* Tx/Rx descriptor status bits */
+	DescOwn			= (1 << 31),
+	RxError			= (1 << 15),
+	RxErrLong		= (1 << 7),
+	RxErrCRC		= (1 << 1),
+	RxErrFIFO		= (1 << 0),
+	RxErrRunt		= (1 << 11),
+	RxErrFrame		= (1 << 14),
+	RingEnd			= (1 << 25),
+	FirstFrag		= (1 << 29),
+	LastFrag		= (1 << 30),
+	TxError			= (1 << 15),
+	TxFIFOUnder		= (1 << 1),
+	TxLinkFail		= (1 << 2) | (1 << 10) | (1 << 11),
+	TxMaxCol		= (1 << 8),
+	TxOWC			= (1 << 9),
+	TxJabber		= (1 << 14),
+	SetupFrame		= (1 << 27),
+	TxSwInt			= (1 << 31),
+
+	/* MacStatus bits */
+	IntrOK			= (1 << 16),
+	IntrErr			= (1 << 15),
+	RxIntr			= (1 << 6),
+	RxEmpty			= (1 << 7),
+	TxIntr			= (1 << 0),
+	TxEmpty			= (1 << 2),
+	PciErr			= (1 << 13),
+	TxState			= (1 << 22) | (1 << 21) | (1 << 20),
+	RxState			= (1 << 19) | (1 << 18) | (1 << 17),
+	LinkFail		= (1 << 12),
+	LinkPass		= (1 << 4),
+	RxStopped		= (1 << 8),
+	TxStopped		= (1 << 1),
+
+	/* MacMode bits */
+	TxEnable		= (1 << 13),
+	RxEnable		= (1 << 1),
+	RxTx			= TxEnable | RxEnable,
+	FullDuplex		= (1 << 9),
+	AcceptAllMulticast	= (1 << 7),
+	AcceptAllPhys		= (1 << 6),
+	BOCnt			= (1 << 5),
+	MacModeClear		= (1<<12) | (1<<11) | (1<<10) | (1<<8) | (1<<3) |
+				  RxTx | BOCnt | AcceptAllPhys | AcceptAllMulticast,
+
+	/* ROMCmd bits */
+	EE_SHIFT_CLK		= 0x02,	/* EEPROM shift clock. */
+	EE_CS			= 0x01,	/* EEPROM chip select. */
+	EE_DATA_WRITE		= 0x04,	/* Data from the Tulip to EEPROM. */
+	EE_WRITE_0		= 0x01,
+	EE_WRITE_1		= 0x05,
+	EE_DATA_READ		= 0x08,	/* Data from the EEPROM chip. */
+	EE_ENB			= (0x4800 | EE_CS),
+
+	/* The EEPROM commands include the alway-set leading bit. */
+	EE_READ_CMD		= 6,
+
+	/* RxMissed bits */
+	RxMissedOver		= (1 << 16),
+	RxMissedMask		= 0xffff,
+
+	/* SROM-related bits */
+	SROMC0InfoLeaf		= 27,
+	MediaBlockMask		= 0x3f,
+	MediaCustomCSRs		= (1 << 6),
+
+	/* PCIPM bits */
+	PM_Sleep		= (1 << 31),
+	PM_Snooze		= (1 << 30),
+	PM_Mask			= PM_Sleep | PM_Snooze,
+
+	/* SIAStatus bits */
+	NWayState		= (1 << 14) | (1 << 13) | (1 << 12),
+	NWayRestart		= (1 << 12),
+	NonselPortActive	= (1 << 9),
+	SelPortActive		= (1 << 8),
+	LinkFailStatus		= (1 << 2),
+	NetCxnErr		= (1 << 1),
+};
+
+static const u32 de_intr_mask =
+	IntrOK | IntrErr | RxIntr | RxEmpty | TxIntr | TxEmpty |
+	LinkPass | LinkFail | PciErr;
+
+/*
+ * Set the programmable burst length to 4 longwords for all:
+ * DMA errors result without these values. Cache align 16 long.
+ */
+static const u32 de_bus_mode = CacheAlign16 | BurstLen4 | DescSkipLen;
+
+struct de_srom_media_block {
+	u8			opts;
+	u16			csr13;
+	u16			csr14;
+	u16			csr15;
+} __packed;
+
+struct de_srom_info_leaf {
+	u16			default_media;
+	u8			n_blocks;
+	u8			unused;
+} __packed;
+
+struct de_desc {
+	__le32			opts1;
+	__le32			opts2;
+	__le32			addr1;
+	__le32			addr2;
+#if DSL
+	__le32			skip[DSL];
+#endif
+};
+
+struct media_info {
+	u16			type;	/* DE_MEDIA_xxx */
+	u16			csr13;
+	u16			csr14;
+	u16			csr15;
+};
+
+struct ring_info {
+	struct sk_buff		*skb;
+	dma_addr_t		mapping;
+};
+
+struct de_private {
+	unsigned		tx_head;
+	unsigned		tx_tail;
+	unsigned		rx_tail;
+
+	void			__iomem *regs;
+	struct net_device	*dev;
+	spinlock_t		lock;
+
+	struct de_desc		*rx_ring;
+	struct de_desc		*tx_ring;
+	struct ring_info	tx_skb[DE_TX_RING_SIZE];
+	struct ring_info	rx_skb[DE_RX_RING_SIZE];
+	unsigned		rx_buf_sz;
+	dma_addr_t		ring_dma;
+
+	u32			msg_enable;
+
+	struct net_device_stats net_stats;
+
+	struct pci_dev		*pdev;
+
+	u16			setup_frame[DE_SETUP_FRAME_WORDS];
+
+	u32			media_type;
+	u32			media_supported;
+	u32			media_advertise;
+	struct media_info	media[DE_MAX_MEDIA];
+	struct timer_list	media_timer;
+
+	u8			*ee_data;
+	unsigned		board_idx;
+	unsigned		de21040 : 1;
+	unsigned		media_lock : 1;
+};
+
+
+static void de_set_rx_mode (struct net_device *dev);
+static void de_tx (struct de_private *de);
+static void de_clean_rings (struct de_private *de);
+static void de_media_interrupt (struct de_private *de, u32 status);
+static void de21040_media_timer (unsigned long data);
+static void de21041_media_timer (unsigned long data);
+static unsigned int de_ok_to_advertise (struct de_private *de, u32 new_media);
+
+
+static DEFINE_PCI_DEVICE_TABLE(de_pci_tbl) = {
+	{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP_PLUS,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1 },
+	{ },
+};
+MODULE_DEVICE_TABLE(pci, de_pci_tbl);
+
+static const char * const media_name[DE_MAX_MEDIA] = {
+	"10baseT auto",
+	"BNC",
+	"AUI",
+	"10baseT-HD",
+	"10baseT-FD"
+};
+
+/* 21040 transceiver register settings:
+ * TP AUTO(unused), BNC(unused), AUI, TP, TP FD*/
+static u16 t21040_csr13[] = { 0, 0, 0x8F09, 0x8F01, 0x8F01, };
+static u16 t21040_csr14[] = { 0, 0, 0x0705, 0xFFFF, 0xFFFD, };
+static u16 t21040_csr15[] = { 0, 0, 0x0006, 0x0000, 0x0000, };
+
+/* 21041 transceiver register settings: TP AUTO, BNC, AUI, TP, TP FD*/
+static u16 t21041_csr13[] = { 0xEF01, 0xEF09, 0xEF09, 0xEF01, 0xEF09, };
+static u16 t21041_csr14[] = { 0xFFFF, 0xF7FD, 0xF7FD, 0x7F3F, 0x7F3D, };
+/* If on-chip autonegotiation is broken, use half-duplex (FF3F) instead */
+static u16 t21041_csr14_brk[] = { 0xFF3F, 0xF7FD, 0xF7FD, 0x7F3F, 0x7F3D, };
+static u16 t21041_csr15[] = { 0x0008, 0x0006, 0x000E, 0x0008, 0x0008, };
+
+
+#define dr32(reg)	ioread32(de->regs + (reg))
+#define dw32(reg, val)	iowrite32((val), de->regs + (reg))
+
+
+static void de_rx_err_acct (struct de_private *de, unsigned rx_tail,
+			    u32 status, u32 len)
+{
+	netif_dbg(de, rx_err, de->dev,
+		  "rx err, slot %d status 0x%x len %d\n",
+		  rx_tail, status, len);
+
+	if ((status & 0x38000300) != 0x0300) {
+		/* Ingore earlier buffers. */
+		if ((status & 0xffff) != 0x7fff) {
+			netif_warn(de, rx_err, de->dev,
+				   "Oversized Ethernet frame spanned multiple buffers, status %08x!\n",
+				   status);
+			de->net_stats.rx_length_errors++;
+		}
+	} else if (status & RxError) {
+		/* There was a fatal error. */
+		de->net_stats.rx_errors++; /* end of a packet.*/
+		if (status & 0x0890) de->net_stats.rx_length_errors++;
+		if (status & RxErrCRC) de->net_stats.rx_crc_errors++;
+		if (status & RxErrFIFO) de->net_stats.rx_fifo_errors++;
+	}
+}
+
+static void de_rx (struct de_private *de)
+{
+	unsigned rx_tail = de->rx_tail;
+	unsigned rx_work = DE_RX_RING_SIZE;
+	unsigned drop = 0;
+	int rc;
+
+	while (--rx_work) {
+		u32 status, len;
+		dma_addr_t mapping;
+		struct sk_buff *skb, *copy_skb;
+		unsigned copying_skb, buflen;
+
+		skb = de->rx_skb[rx_tail].skb;
+		BUG_ON(!skb);
+		rmb();
+		status = le32_to_cpu(de->rx_ring[rx_tail].opts1);
+		if (status & DescOwn)
+			break;
+
+		len = ((status >> 16) & 0x7ff) - 4;
+		mapping = de->rx_skb[rx_tail].mapping;
+
+		if (unlikely(drop)) {
+			de->net_stats.rx_dropped++;
+			goto rx_next;
+		}
+
+		if (unlikely((status & 0x38008300) != 0x0300)) {
+			de_rx_err_acct(de, rx_tail, status, len);
+			goto rx_next;
+		}
+
+		copying_skb = (len <= rx_copybreak);
+
+		netif_dbg(de, rx_status, de->dev,
+			  "rx slot %d status 0x%x len %d copying? %d\n",
+			  rx_tail, status, len, copying_skb);
+
+		buflen = copying_skb ? (len + RX_OFFSET) : de->rx_buf_sz;
+		copy_skb = dev_alloc_skb (buflen);
+		if (unlikely(!copy_skb)) {
+			de->net_stats.rx_dropped++;
+			drop = 1;
+			rx_work = 100;
+			goto rx_next;
+		}
+
+		if (!copying_skb) {
+			pci_unmap_single(de->pdev, mapping,
+					 buflen, PCI_DMA_FROMDEVICE);
+			skb_put(skb, len);
+
+			mapping =
+			de->rx_skb[rx_tail].mapping =
+				pci_map_single(de->pdev, copy_skb->data,
+					       buflen, PCI_DMA_FROMDEVICE);
+			de->rx_skb[rx_tail].skb = copy_skb;
+		} else {
+			pci_dma_sync_single_for_cpu(de->pdev, mapping, len, PCI_DMA_FROMDEVICE);
+			skb_reserve(copy_skb, RX_OFFSET);
+			skb_copy_from_linear_data(skb, skb_put(copy_skb, len),
+						  len);
+			pci_dma_sync_single_for_device(de->pdev, mapping, len, PCI_DMA_FROMDEVICE);
+
+			/* We'll reuse the original ring buffer. */
+			skb = copy_skb;
+		}
+
+		skb->protocol = eth_type_trans (skb, de->dev);
+
+		de->net_stats.rx_packets++;
+		de->net_stats.rx_bytes += skb->len;
+		rc = netif_rx (skb);
+		if (rc == NET_RX_DROP)
+			drop = 1;
+
+rx_next:
+		if (rx_tail == (DE_RX_RING_SIZE - 1))
+			de->rx_ring[rx_tail].opts2 =
+				cpu_to_le32(RingEnd | de->rx_buf_sz);
+		else
+			de->rx_ring[rx_tail].opts2 = cpu_to_le32(de->rx_buf_sz);
+		de->rx_ring[rx_tail].addr1 = cpu_to_le32(mapping);
+		wmb();
+		de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
+		rx_tail = NEXT_RX(rx_tail);
+	}
+
+	if (!rx_work)
+		netdev_warn(de->dev, "rx work limit reached\n");
+
+	de->rx_tail = rx_tail;
+}
+
+static irqreturn_t de_interrupt (int irq, void *dev_instance)
+{
+	struct net_device *dev = dev_instance;
+	struct de_private *de = netdev_priv(dev);
+	u32 status;
+
+	status = dr32(MacStatus);
+	if ((!(status & (IntrOK|IntrErr))) || (status == 0xFFFF))
+		return IRQ_NONE;
+
+	netif_dbg(de, intr, dev, "intr, status %08x mode %08x desc %u/%u/%u\n",
+		  status, dr32(MacMode),
+		  de->rx_tail, de->tx_head, de->tx_tail);
+
+	dw32(MacStatus, status);
+
+	if (status & (RxIntr | RxEmpty)) {
+		de_rx(de);
+		if (status & RxEmpty)
+			dw32(RxPoll, NormalRxPoll);
+	}
+
+	spin_lock(&de->lock);
+
+	if (status & (TxIntr | TxEmpty))
+		de_tx(de);
+
+	if (status & (LinkPass | LinkFail))
+		de_media_interrupt(de, status);
+
+	spin_unlock(&de->lock);
+
+	if (status & PciErr) {
+		u16 pci_status;
+
+		pci_read_config_word(de->pdev, PCI_STATUS, &pci_status);
+		pci_write_config_word(de->pdev, PCI_STATUS, pci_status);
+		netdev_err(de->dev,
+			   "PCI bus error, status=%08x, PCI status=%04x\n",
+			   status, pci_status);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void de_tx (struct de_private *de)
+{
+	unsigned tx_head = de->tx_head;
+	unsigned tx_tail = de->tx_tail;
+
+	while (tx_tail != tx_head) {
+		struct sk_buff *skb;
+		u32 status;
+
+		rmb();
+		status = le32_to_cpu(de->tx_ring[tx_tail].opts1);
+		if (status & DescOwn)
+			break;
+
+		skb = de->tx_skb[tx_tail].skb;
+		BUG_ON(!skb);
+		if (unlikely(skb == DE_DUMMY_SKB))
+			goto next;
+
+		if (unlikely(skb == DE_SETUP_SKB)) {
+			pci_unmap_single(de->pdev, de->tx_skb[tx_tail].mapping,
+					 sizeof(de->setup_frame), PCI_DMA_TODEVICE);
+			goto next;
+		}
+
+		pci_unmap_single(de->pdev, de->tx_skb[tx_tail].mapping,
+				 skb->len, PCI_DMA_TODEVICE);
+
+		if (status & LastFrag) {
+			if (status & TxError) {
+				netif_dbg(de, tx_err, de->dev,
+					  "tx err, status 0x%x\n",
+					  status);
+				de->net_stats.tx_errors++;
+				if (status & TxOWC)
+					de->net_stats.tx_window_errors++;
+				if (status & TxMaxCol)
+					de->net_stats.tx_aborted_errors++;
+				if (status & TxLinkFail)
+					de->net_stats.tx_carrier_errors++;
+				if (status & TxFIFOUnder)
+					de->net_stats.tx_fifo_errors++;
+			} else {
+				de->net_stats.tx_packets++;
+				de->net_stats.tx_bytes += skb->len;
+				netif_dbg(de, tx_done, de->dev,
+					  "tx done, slot %d\n", tx_tail);
+			}
+			dev_kfree_skb_irq(skb);
+		}
+
+next:
+		de->tx_skb[tx_tail].skb = NULL;
+
+		tx_tail = NEXT_TX(tx_tail);
+	}
+
+	de->tx_tail = tx_tail;
+
+	if (netif_queue_stopped(de->dev) && (TX_BUFFS_AVAIL(de) > (DE_TX_RING_SIZE / 4)))
+		netif_wake_queue(de->dev);
+}
+
+static netdev_tx_t de_start_xmit (struct sk_buff *skb,
+					struct net_device *dev)
+{
+	struct de_private *de = netdev_priv(dev);
+	unsigned int entry, tx_free;
+	u32 mapping, len, flags = FirstFrag | LastFrag;
+	struct de_desc *txd;
+
+	spin_lock_irq(&de->lock);
+
+	tx_free = TX_BUFFS_AVAIL(de);
+	if (tx_free == 0) {
+		netif_stop_queue(dev);
+		spin_unlock_irq(&de->lock);
+		return NETDEV_TX_BUSY;
+	}
+	tx_free--;
+
+	entry = de->tx_head;
+
+	txd = &de->tx_ring[entry];
+
+	len = skb->len;
+	mapping = pci_map_single(de->pdev, skb->data, len, PCI_DMA_TODEVICE);
+	if (entry == (DE_TX_RING_SIZE - 1))
+		flags |= RingEnd;
+	if (!tx_free || (tx_free == (DE_TX_RING_SIZE / 2)))
+		flags |= TxSwInt;
+	flags |= len;
+	txd->opts2 = cpu_to_le32(flags);
+	txd->addr1 = cpu_to_le32(mapping);
+
+	de->tx_skb[entry].skb = skb;
+	de->tx_skb[entry].mapping = mapping;
+	wmb();
+
+	txd->opts1 = cpu_to_le32(DescOwn);
+	wmb();
+
+	de->tx_head = NEXT_TX(entry);
+	netif_dbg(de, tx_queued, dev, "tx queued, slot %d, skblen %d\n",
+		  entry, skb->len);
+
+	if (tx_free == 0)
+		netif_stop_queue(dev);
+
+	spin_unlock_irq(&de->lock);
+
+	/* Trigger an immediate transmit demand. */
+	dw32(TxPoll, NormalTxPoll);
+
+	return NETDEV_TX_OK;
+}
+
+/* Set or clear the multicast filter for this adaptor.
+   Note that we only use exclusion around actually queueing the
+   new frame, not around filling de->setup_frame.  This is non-deterministic
+   when re-entered but still correct. */
+
+#undef set_bit_le
+#define set_bit_le(i,p) do { ((char *)(p))[(i)/8] |= (1<<((i)%8)); } while(0)
+
+static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
+{
+	struct de_private *de = netdev_priv(dev);
+	u16 hash_table[32];
+	struct netdev_hw_addr *ha;
+	int i;
+	u16 *eaddrs;
+
+	memset(hash_table, 0, sizeof(hash_table));
+	set_bit_le(255, hash_table); 			/* Broadcast entry */
+	/* This should work on big-endian machines as well. */
+	netdev_for_each_mc_addr(ha, dev) {
+		int index = ether_crc_le(ETH_ALEN, ha->addr) & 0x1ff;
+
+		set_bit_le(index, hash_table);
+	}
+
+	for (i = 0; i < 32; i++) {
+		*setup_frm++ = hash_table[i];
+		*setup_frm++ = hash_table[i];
+	}
+	setup_frm = &de->setup_frame[13*6];
+
+	/* Fill the final entry with our physical address. */
+	eaddrs = (u16 *)dev->dev_addr;
+	*setup_frm++ = eaddrs[0]; *setup_frm++ = eaddrs[0];
+	*setup_frm++ = eaddrs[1]; *setup_frm++ = eaddrs[1];
+	*setup_frm++ = eaddrs[2]; *setup_frm++ = eaddrs[2];
+}
+
+static void build_setup_frame_perfect(u16 *setup_frm, struct net_device *dev)
+{
+	struct de_private *de = netdev_priv(dev);
+	struct netdev_hw_addr *ha;
+	u16 *eaddrs;
+
+	/* We have <= 14 addresses so we can use the wonderful
+	   16 address perfect filtering of the Tulip. */
+	netdev_for_each_mc_addr(ha, dev) {
+		eaddrs = (u16 *) ha->addr;
+		*setup_frm++ = *eaddrs; *setup_frm++ = *eaddrs++;
+		*setup_frm++ = *eaddrs; *setup_frm++ = *eaddrs++;
+		*setup_frm++ = *eaddrs; *setup_frm++ = *eaddrs++;
+	}
+	/* Fill the unused entries with the broadcast address. */
+	memset(setup_frm, 0xff, (15 - netdev_mc_count(dev)) * 12);
+	setup_frm = &de->setup_frame[15*6];
+
+	/* Fill the final entry with our physical address. */
+	eaddrs = (u16 *)dev->dev_addr;
+	*setup_frm++ = eaddrs[0]; *setup_frm++ = eaddrs[0];
+	*setup_frm++ = eaddrs[1]; *setup_frm++ = eaddrs[1];
+	*setup_frm++ = eaddrs[2]; *setup_frm++ = eaddrs[2];
+}
+
+
+static void __de_set_rx_mode (struct net_device *dev)
+{
+	struct de_private *de = netdev_priv(dev);
+	u32 macmode;
+	unsigned int entry;
+	u32 mapping;
+	struct de_desc *txd;
+	struct de_desc *dummy_txd = NULL;
+
+	macmode = dr32(MacMode) & ~(AcceptAllMulticast | AcceptAllPhys);
+
+	if (dev->flags & IFF_PROMISC) {	/* Set promiscuous. */
+		macmode |= AcceptAllMulticast | AcceptAllPhys;
+		goto out;
+	}
+
+	if ((netdev_mc_count(dev) > 1000) || (dev->flags & IFF_ALLMULTI)) {
+		/* Too many to filter well -- accept all multicasts. */
+		macmode |= AcceptAllMulticast;
+		goto out;
+	}
+
+	/* Note that only the low-address shortword of setup_frame is valid!
+	   The values are doubled for big-endian architectures. */
+	if (netdev_mc_count(dev) > 14)	/* Must use a multicast hash table. */
+		build_setup_frame_hash (de->setup_frame, dev);
+	else
+		build_setup_frame_perfect (de->setup_frame, dev);
+
+	/*
+	 * Now add this frame to the Tx list.
+	 */
+
+	entry = de->tx_head;
+
+	/* Avoid a chip errata by prefixing a dummy entry. */
+	if (entry != 0) {
+		de->tx_skb[entry].skb = DE_DUMMY_SKB;
+
+		dummy_txd = &de->tx_ring[entry];
+		dummy_txd->opts2 = (entry == (DE_TX_RING_SIZE - 1)) ?
+				   cpu_to_le32(RingEnd) : 0;
+		dummy_txd->addr1 = 0;
+
+		/* Must set DescOwned later to avoid race with chip */
+
+		entry = NEXT_TX(entry);
+	}
+
+	de->tx_skb[entry].skb = DE_SETUP_SKB;
+	de->tx_skb[entry].mapping = mapping =
+	    pci_map_single (de->pdev, de->setup_frame,
+			    sizeof (de->setup_frame), PCI_DMA_TODEVICE);
+
+	/* Put the setup frame on the Tx list. */
+	txd = &de->tx_ring[entry];
+	if (entry == (DE_TX_RING_SIZE - 1))
+		txd->opts2 = cpu_to_le32(SetupFrame | RingEnd | sizeof (de->setup_frame));
+	else
+		txd->opts2 = cpu_to_le32(SetupFrame | sizeof (de->setup_frame));
+	txd->addr1 = cpu_to_le32(mapping);
+	wmb();
+
+	txd->opts1 = cpu_to_le32(DescOwn);
+	wmb();
+
+	if (dummy_txd) {
+		dummy_txd->opts1 = cpu_to_le32(DescOwn);
+		wmb();
+	}
+
+	de->tx_head = NEXT_TX(entry);
+
+	if (TX_BUFFS_AVAIL(de) == 0)
+		netif_stop_queue(dev);
+
+	/* Trigger an immediate transmit demand. */
+	dw32(TxPoll, NormalTxPoll);
+
+out:
+	if (macmode != dr32(MacMode))
+		dw32(MacMode, macmode);
+}
+
+static void de_set_rx_mode (struct net_device *dev)
+{
+	unsigned long flags;
+	struct de_private *de = netdev_priv(dev);
+
+	spin_lock_irqsave (&de->lock, flags);
+	__de_set_rx_mode(dev);
+	spin_unlock_irqrestore (&de->lock, flags);
+}
+
+static inline void de_rx_missed(struct de_private *de, u32 rx_missed)
+{
+	if (unlikely(rx_missed & RxMissedOver))
+		de->net_stats.rx_missed_errors += RxMissedMask;
+	else
+		de->net_stats.rx_missed_errors += (rx_missed & RxMissedMask);
+}
+
+static void __de_get_stats(struct de_private *de)
+{
+	u32 tmp = dr32(RxMissed); /* self-clearing */
+
+	de_rx_missed(de, tmp);
+}
+
+static struct net_device_stats *de_get_stats(struct net_device *dev)
+{
+	struct de_private *de = netdev_priv(dev);
+
+	/* The chip only need report frame silently dropped. */
+	spin_lock_irq(&de->lock);
+ 	if (netif_running(dev) && netif_device_present(dev))
+ 		__de_get_stats(de);
+	spin_unlock_irq(&de->lock);
+
+	return &de->net_stats;
+}
+
+static inline int de_is_running (struct de_private *de)
+{
+	return (dr32(MacStatus) & (RxState | TxState)) ? 1 : 0;
+}
+
+static void de_stop_rxtx (struct de_private *de)
+{
+	u32 macmode;
+	unsigned int i = 1300/100;
+
+	macmode = dr32(MacMode);
+	if (macmode & RxTx) {
+		dw32(MacMode, macmode & ~RxTx);
+		dr32(MacMode);
+	}
+
+	/* wait until in-flight frame completes.
+	 * Max time @ 10BT: 1500*8b/10Mbps == 1200us (+ 100us margin)
+	 * Typically expect this loop to end in < 50 us on 100BT.
+	 */
+	while (--i) {
+		if (!de_is_running(de))
+			return;
+		udelay(100);
+	}
+
+	netdev_warn(de->dev, "timeout expired, stopping DMA\n");
+}
+
+static inline void de_start_rxtx (struct de_private *de)
+{
+	u32 macmode;
+
+	macmode = dr32(MacMode);
+	if ((macmode & RxTx) != RxTx) {
+		dw32(MacMode, macmode | RxTx);
+		dr32(MacMode);
+	}
+}
+
+static void de_stop_hw (struct de_private *de)
+{
+
+	udelay(5);
+	dw32(IntrMask, 0);
+
+	de_stop_rxtx(de);
+
+	dw32(MacStatus, dr32(MacStatus));
+
+	udelay(10);
+
+	de->rx_tail = 0;
+	de->tx_head = de->tx_tail = 0;
+}
+
+static void de_link_up(struct de_private *de)
+{
+	if (!netif_carrier_ok(de->dev)) {
+		netif_carrier_on(de->dev);
+		netif_info(de, link, de->dev, "link up, media %s\n",
+			   media_name[de->media_type]);
+	}
+}
+
+static void de_link_down(struct de_private *de)
+{
+	if (netif_carrier_ok(de->dev)) {
+		netif_carrier_off(de->dev);
+		netif_info(de, link, de->dev, "link down\n");
+	}
+}
+
+static void de_set_media (struct de_private *de)
+{
+	unsigned media = de->media_type;
+	u32 macmode = dr32(MacMode);
+
+	if (de_is_running(de))
+		netdev_warn(de->dev, "chip is running while changing media!\n");
+
+	if (de->de21040)
+		dw32(CSR11, FULL_DUPLEX_MAGIC);
+	dw32(CSR13, 0); /* Reset phy */
+	dw32(CSR14, de->media[media].csr14);
+	dw32(CSR15, de->media[media].csr15);
+	dw32(CSR13, de->media[media].csr13);
+
+	/* must delay 10ms before writing to other registers,
+	 * especially CSR6
+	 */
+	mdelay(10);
+
+	if (media == DE_MEDIA_TP_FD)
+		macmode |= FullDuplex;
+	else
+		macmode &= ~FullDuplex;
+
+	netif_info(de, link, de->dev, "set link %s\n", media_name[media]);
+	netif_info(de, hw, de->dev, "mode 0x%x, sia 0x%x,0x%x,0x%x,0x%x\n",
+		   dr32(MacMode), dr32(SIAStatus),
+		   dr32(CSR13), dr32(CSR14), dr32(CSR15));
+	netif_info(de, hw, de->dev, "set mode 0x%x, set sia 0x%x,0x%x,0x%x\n",
+		   macmode, de->media[media].csr13,
+		   de->media[media].csr14, de->media[media].csr15);
+	if (macmode != dr32(MacMode))
+		dw32(MacMode, macmode);
+}
+
+static void de_next_media (struct de_private *de, const u32 *media,
+			   unsigned int n_media)
+{
+	unsigned int i;
+
+	for (i = 0; i < n_media; i++) {
+		if (de_ok_to_advertise(de, media[i])) {
+			de->media_type = media[i];
+			return;
+		}
+	}
+}
+
+static void de21040_media_timer (unsigned long data)
+{
+	struct de_private *de = (struct de_private *) data;
+	struct net_device *dev = de->dev;
+	u32 status = dr32(SIAStatus);
+	unsigned int carrier;
+	unsigned long flags;
+
+	carrier = (status & NetCxnErr) ? 0 : 1;
+
+	if (carrier) {
+		if (de->media_type != DE_MEDIA_AUI && (status & LinkFailStatus))
+			goto no_link_yet;
+
+		de->media_timer.expires = jiffies + DE_TIMER_LINK;
+		add_timer(&de->media_timer);
+		if (!netif_carrier_ok(dev))
+			de_link_up(de);
+		else
+			netif_info(de, timer, dev, "%s link ok, status %x\n",
+				   media_name[de->media_type], status);
+		return;
+	}
+
+	de_link_down(de);
+
+	if (de->media_lock)
+		return;
+
+	if (de->media_type == DE_MEDIA_AUI) {
+		static const u32 next_state = DE_MEDIA_TP;
+		de_next_media(de, &next_state, 1);
+	} else {
+		static const u32 next_state = DE_MEDIA_AUI;
+		de_next_media(de, &next_state, 1);
+	}
+
+	spin_lock_irqsave(&de->lock, flags);
+	de_stop_rxtx(de);
+	spin_unlock_irqrestore(&de->lock, flags);
+	de_set_media(de);
+	de_start_rxtx(de);
+
+no_link_yet:
+	de->media_timer.expires = jiffies + DE_TIMER_NO_LINK;
+	add_timer(&de->media_timer);
+
+	netif_info(de, timer, dev, "no link, trying media %s, status %x\n",
+		   media_name[de->media_type], status);
+}
+
+static unsigned int de_ok_to_advertise (struct de_private *de, u32 new_media)
+{
+	switch (new_media) {
+	case DE_MEDIA_TP_AUTO:
+		if (!(de->media_advertise & ADVERTISED_Autoneg))
+			return 0;
+		if (!(de->media_advertise & (ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full)))
+			return 0;
+		break;
+	case DE_MEDIA_BNC:
+		if (!(de->media_advertise & ADVERTISED_BNC))
+			return 0;
+		break;
+	case DE_MEDIA_AUI:
+		if (!(de->media_advertise & ADVERTISED_AUI))
+			return 0;
+		break;
+	case DE_MEDIA_TP:
+		if (!(de->media_advertise & ADVERTISED_10baseT_Half))
+			return 0;
+		break;
+	case DE_MEDIA_TP_FD:
+		if (!(de->media_advertise & ADVERTISED_10baseT_Full))
+			return 0;
+		break;
+	}
+
+	return 1;
+}
+
+static void de21041_media_timer (unsigned long data)
+{
+	struct de_private *de = (struct de_private *) data;
+	struct net_device *dev = de->dev;
+	u32 status = dr32(SIAStatus);
+	unsigned int carrier;
+	unsigned long flags;
+
+	/* clear port active bits */
+	dw32(SIAStatus, NonselPortActive | SelPortActive);
+
+	carrier = (status & NetCxnErr) ? 0 : 1;
+
+	if (carrier) {
+		if ((de->media_type == DE_MEDIA_TP_AUTO ||
+		     de->media_type == DE_MEDIA_TP ||
+		     de->media_type == DE_MEDIA_TP_FD) &&
+		    (status & LinkFailStatus))
+			goto no_link_yet;
+
+		de->media_timer.expires = jiffies + DE_TIMER_LINK;
+		add_timer(&de->media_timer);
+		if (!netif_carrier_ok(dev))
+			de_link_up(de);
+		else
+			netif_info(de, timer, dev,
+				   "%s link ok, mode %x status %x\n",
+				   media_name[de->media_type],
+				   dr32(MacMode), status);
+		return;
+	}
+
+	de_link_down(de);
+
+	/* if media type locked, don't switch media */
+	if (de->media_lock)
+		goto set_media;
+
+	/* if activity detected, use that as hint for new media type */
+	if (status & NonselPortActive) {
+		unsigned int have_media = 1;
+
+		/* if AUI/BNC selected, then activity is on TP port */
+		if (de->media_type == DE_MEDIA_AUI ||
+		    de->media_type == DE_MEDIA_BNC) {
+			if (de_ok_to_advertise(de, DE_MEDIA_TP_AUTO))
+				de->media_type = DE_MEDIA_TP_AUTO;
+			else
+				have_media = 0;
+		}
+
+		/* TP selected.  If there is only TP and BNC, then it's BNC */
+		else if (((de->media_supported & DE_AUI_BNC) == SUPPORTED_BNC) &&
+			 de_ok_to_advertise(de, DE_MEDIA_BNC))
+			de->media_type = DE_MEDIA_BNC;
+
+		/* TP selected.  If there is only TP and AUI, then it's AUI */
+		else if (((de->media_supported & DE_AUI_BNC) == SUPPORTED_AUI) &&
+			 de_ok_to_advertise(de, DE_MEDIA_AUI))
+			de->media_type = DE_MEDIA_AUI;
+
+		/* otherwise, ignore the hint */
+		else
+			have_media = 0;
+
+		if (have_media)
+			goto set_media;
+	}
+
+	/*
+	 * Absent or ambiguous activity hint, move to next advertised
+	 * media state.  If de->media_type is left unchanged, this
+	 * simply resets the PHY and reloads the current media settings.
+	 */
+	if (de->media_type == DE_MEDIA_AUI) {
+		static const u32 next_states[] = {
+			DE_MEDIA_BNC, DE_MEDIA_TP_AUTO
+		};
+		de_next_media(de, next_states, ARRAY_SIZE(next_states));
+	} else if (de->media_type == DE_MEDIA_BNC) {
+		static const u32 next_states[] = {
+			DE_MEDIA_TP_AUTO, DE_MEDIA_AUI
+		};
+		de_next_media(de, next_states, ARRAY_SIZE(next_states));
+	} else {
+		static const u32 next_states[] = {
+			DE_MEDIA_AUI, DE_MEDIA_BNC, DE_MEDIA_TP_AUTO
+		};
+		de_next_media(de, next_states, ARRAY_SIZE(next_states));
+	}
+
+set_media:
+	spin_lock_irqsave(&de->lock, flags);
+	de_stop_rxtx(de);
+	spin_unlock_irqrestore(&de->lock, flags);
+	de_set_media(de);
+	de_start_rxtx(de);
+