Linux-2.6.12-rc2v2.6.12-rc2

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

Let it rip!

18 files changed, 21042 insertions, 0 deletions

diff --git a/drivers/net/tulip/21142.c b/drivers/net/tulip/21142.c
new file mode 100644
index 00000000000..5db694c4eb0
--- /dev/null
+++ b/drivers/net/tulip/21142.c
@@ -0,0 +1,245 @@
+/*
+	drivers/net/tulip/21142.c
+
+	Maintained by Jeff Garzik <jgarzik@pobox.com>
+	Copyright 2000,2001  The Linux Kernel Team
+	Written/copyright 1994-2001 by Donald Becker.
+
+	This software may be used and distributed according to the terms
+	of the GNU General Public License, incorporated herein by reference.
+
+	Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
+	for more information on this driver, or visit the project
+	Web page at http://sourceforge.net/projects/tulip/
+
+*/
+
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include "tulip.h"
+
+
+static u16 t21142_csr13[] = { 0x0001, 0x0009, 0x0009, 0x0000, 0x0001, };
+u16 t21142_csr14[] =	    { 0xFFFF, 0x0705, 0x0705, 0x0000, 0x7F3D, };
+static u16 t21142_csr15[] = { 0x0008, 0x0006, 0x000E, 0x0008, 0x0008, };
+
+
+/* Handle the 21143 uniquely: do autoselect with NWay, not the EEPROM list
+   of available transceivers.  */
+void t21142_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct tulip_private *tp = netdev_priv(dev);
+	void __iomem *ioaddr = tp->base_addr;
+	int csr12 = ioread32(ioaddr + CSR12);
+	int next_tick = 60*HZ;
+	int new_csr6 = 0;
+
+	if (tulip_debug > 2)
+		printk(KERN_INFO"%s: 21143 negotiation status %8.8x, %s.\n",
+			   dev->name, csr12, medianame[dev->if_port]);
+	if (tulip_media_cap[dev->if_port] & MediaIsMII) {
+		if (tulip_check_duplex(dev) < 0) {
+			netif_carrier_off(dev);
+			next_tick = 3*HZ;
+		} else {
+			netif_carrier_on(dev);
+			next_tick = 60*HZ;
+		}
+	} else if (tp->nwayset) {
+		/* Don't screw up a negotiated session! */
+		if (tulip_debug > 1)
+			printk(KERN_INFO"%s: Using NWay-set %s media, csr12 %8.8x.\n",
+				   dev->name, medianame[dev->if_port], csr12);
+	} else if (tp->medialock) {
+			;
+	} else if (dev->if_port == 3) {
+		if (csr12 & 2) {	/* No 100mbps link beat, revert to 10mbps. */
+			if (tulip_debug > 1)
+				printk(KERN_INFO"%s: No 21143 100baseTx link beat, %8.8x, "
+					   "trying NWay.\n", dev->name, csr12);
+			t21142_start_nway(dev);
+			next_tick = 3*HZ;
+		}
+	} else if ((csr12 & 0x7000) != 0x5000) {
+		/* Negotiation failed.  Search media types. */
+		if (tulip_debug > 1)
+			printk(KERN_INFO"%s: 21143 negotiation failed, status %8.8x.\n",
+				   dev->name, csr12);
+		if (!(csr12 & 4)) {		/* 10mbps link beat good. */
+			new_csr6 = 0x82420000;
+			dev->if_port = 0;
+			iowrite32(0, ioaddr + CSR13);
+			iowrite32(0x0003FFFF, ioaddr + CSR14);
+			iowrite16(t21142_csr15[dev->if_port], ioaddr + CSR15);
+			iowrite32(t21142_csr13[dev->if_port], ioaddr + CSR13);
+		} else {
+			/* Select 100mbps port to check for link beat. */
+			new_csr6 = 0x83860000;
+			dev->if_port = 3;
+			iowrite32(0, ioaddr + CSR13);
+			iowrite32(0x0003FF7F, ioaddr + CSR14);
+			iowrite16(8, ioaddr + CSR15);
+			iowrite32(1, ioaddr + CSR13);
+		}
+		if (tulip_debug > 1)
+			printk(KERN_INFO"%s: Testing new 21143 media %s.\n",
+				   dev->name, medianame[dev->if_port]);
+		if (new_csr6 != (tp->csr6 & ~0x00D5)) {
+			tp->csr6 &= 0x00D5;
+			tp->csr6 |= new_csr6;
+			iowrite32(0x0301, ioaddr + CSR12);
+			tulip_restart_rxtx(tp);
+		}
+		next_tick = 3*HZ;
+	}
+
+	/* mod_timer synchronizes us with potential add_timer calls
+	 * from interrupts.
+	 */
+	mod_timer(&tp->timer, RUN_AT(next_tick));
+}
+
+
+void t21142_start_nway(struct net_device *dev)
+{
+	struct tulip_private *tp = netdev_priv(dev);
+	void __iomem *ioaddr = tp->base_addr;
+	int csr14 = ((tp->sym_advertise & 0x0780) << 9)  |
+		((tp->sym_advertise & 0x0020) << 1) | 0xffbf;
+
+	dev->if_port = 0;
+	tp->nway = tp->mediasense = 1;
+	tp->nwayset = tp->lpar = 0;
+	if (tulip_debug > 1)
+		printk(KERN_DEBUG "%s: Restarting 21143 autonegotiation, csr14=%8.8x.\n",
+			   dev->name, csr14);
+	iowrite32(0x0001, ioaddr + CSR13);
+	udelay(100);
+	iowrite32(csr14, ioaddr + CSR14);
+	tp->csr6 = 0x82420000 | (tp->sym_advertise & 0x0040 ? FullDuplex : 0);
+	iowrite32(tp->csr6, ioaddr + CSR6);
+	if (tp->mtable  &&  tp->mtable->csr15dir) {
+		iowrite32(tp->mtable->csr15dir, ioaddr + CSR15);
+		iowrite32(tp->mtable->csr15val, ioaddr + CSR15);
+	} else
+		iowrite16(0x0008, ioaddr + CSR15);
+	iowrite32(0x1301, ioaddr + CSR12); 		/* Trigger NWAY. */
+}
+
+
+
+void t21142_lnk_change(struct net_device *dev, int csr5)
+{
+	struct tulip_private *tp = netdev_priv(dev);
+	void __iomem *ioaddr = tp->base_addr;
+	int csr12 = ioread32(ioaddr + CSR12);
+
+	if (tulip_debug > 1)
+		printk(KERN_INFO"%s: 21143 link status interrupt %8.8x, CSR5 %x, "
+			   "%8.8x.\n", dev->name, csr12, csr5, ioread32(ioaddr + CSR14));
+
+	/* If NWay finished and we have a negotiated partner capability. */
+	if (tp->nway  &&  !tp->nwayset  &&  (csr12 & 0x7000) == 0x5000) {
+		int setup_done = 0;
+		int negotiated = tp->sym_advertise & (csr12 >> 16);
+		tp->lpar = csr12 >> 16;
+		tp->nwayset = 1;
+		if (negotiated & 0x0100)		dev->if_port = 5;
+		else if (negotiated & 0x0080)	dev->if_port = 3;
+		else if (negotiated & 0x0040)	dev->if_port = 4;
+		else if (negotiated & 0x0020)	dev->if_port = 0;
+		else {
+			tp->nwayset = 0;
+			if ((csr12 & 2) == 0  &&  (tp->sym_advertise & 0x0180))
+				dev->if_port = 3;
+		}
+		tp->full_duplex = (tulip_media_cap[dev->if_port] & MediaAlwaysFD) ? 1:0;
+
+		if (tulip_debug > 1) {
+			if (tp->nwayset)
+				printk(KERN_INFO "%s: Switching to %s based on link "
+					   "negotiation %4.4x & %4.4x = %4.4x.\n",
+					   dev->name, medianame[dev->if_port], tp->sym_advertise,
+					   tp->lpar, negotiated);
+			else
+				printk(KERN_INFO "%s: Autonegotiation failed, using %s,"
+					   " link beat status %4.4x.\n",
+					   dev->name, medianame[dev->if_port], csr12);
+		}
+
+		if (tp->mtable) {
+			int i;
+			for (i = 0; i < tp->mtable->leafcount; i++)
+				if (tp->mtable->mleaf[i].media == dev->if_port) {
+					int startup = ! ((tp->chip_id == DC21143 && tp->revision == 65));
+					tp->cur_index = i;
+					tulip_select_media(dev, startup);
+					setup_done = 1;
+					break;
+				}
+		}
+		if ( ! setup_done) {
+			tp->csr6 = (dev->if_port & 1 ? 0x838E0000 : 0x82420000) | (tp->csr6 & 0x20ff);
+			if (tp->full_duplex)
+				tp->csr6 |= 0x0200;
+			iowrite32(1, ioaddr + CSR13);
+		}
+#if 0							/* Restart shouldn't be needed. */
+		iowrite32(tp->csr6 | RxOn, ioaddr + CSR6);
+		if (tulip_debug > 2)
+			printk(KERN_DEBUG "%s:  Restarting Tx and Rx, CSR5 is %8.8x.\n",
+				   dev->name, ioread32(ioaddr + CSR5));
+#endif
+		tulip_start_rxtx(tp);
+		if (tulip_debug > 2)
+			printk(KERN_DEBUG "%s:  Setting CSR6 %8.8x/%x CSR12 %8.8x.\n",
+				   dev->name, tp->csr6, ioread32(ioaddr + CSR6),
+				   ioread32(ioaddr + CSR12));
+	} else if ((tp->nwayset  &&  (csr5 & 0x08000000)
+				&& (dev->if_port == 3  ||  dev->if_port == 5)
+				&& (csr12 & 2) == 2) ||
+			   (tp->nway && (csr5 & (TPLnkFail)))) {
+		/* Link blew? Maybe restart NWay. */
+		del_timer_sync(&tp->timer);
+		t21142_start_nway(dev);
+		tp->timer.expires = RUN_AT(3*HZ);
+		add_timer(&tp->timer);
+	} else if (dev->if_port == 3  ||  dev->if_port == 5) {
+		if (tulip_debug > 1)
+			printk(KERN_INFO"%s: 21143 %s link beat %s.\n",
+				   dev->name, medianame[dev->if_port],
+				   (csr12 & 2) ? "failed" : "good");
+		if ((csr12 & 2)  &&  ! tp->medialock) {
+			del_timer_sync(&tp->timer);
+			t21142_start_nway(dev);
+			tp->timer.expires = RUN_AT(3*HZ);
+			add_timer(&tp->timer);
+		} else if (dev->if_port == 5)
+			iowrite32(ioread32(ioaddr + CSR14) & ~0x080, ioaddr + CSR14);
+	} else if (dev->if_port == 0  ||  dev->if_port == 4) {
+		if ((csr12 & 4) == 0)
+			printk(KERN_INFO"%s: 21143 10baseT link beat good.\n",
+				   dev->name);
+	} else if (!(csr12 & 4)) {		/* 10mbps link beat good. */
+		if (tulip_debug)
+			printk(KERN_INFO"%s: 21143 10mbps sensed media.\n",
+				   dev->name);
+		dev->if_port = 0;
+	} else if (tp->nwayset) {
+		if (tulip_debug)
+			printk(KERN_INFO"%s: 21143 using NWay-set %s, csr6 %8.8x.\n",
+				   dev->name, medianame[dev->if_port], tp->csr6);
+	} else {		/* 100mbps link beat good. */
+		if (tulip_debug)
+			printk(KERN_INFO"%s: 21143 100baseTx sensed media.\n",
+				   dev->name);
+		dev->if_port = 3;
+		tp->csr6 = 0x838E0000 | (tp->csr6 & 0x20ff);
+		iowrite32(0x0003FF7F, ioaddr + CSR14);
+		iowrite32(0x0301, ioaddr + CSR12);
+		tulip_restart_rxtx(tp);
+	}
+}
+
+
diff --git a/drivers/net/tulip/Kconfig b/drivers/net/tulip/Kconfig
new file mode 100644
index 00000000000..e2cdaf87620
--- /dev/null
+++ b/drivers/net/tulip/Kconfig
@@ -0,0 +1,166 @@
+#
+# Tulip family network device configuration
+#
+
+menu "Tulip family network device support"
+	depends on NET_ETHERNET && (PCI || EISA || CARDBUS)
+
+config NET_TULIP
+	bool "\"Tulip\" family network device support"
+	help
+	  This selects the "Tulip" family of EISA/PCI network cards.
+
+config DE2104X
+	tristate "Early DECchip Tulip (dc2104x) PCI support (EXPERIMENTAL)"
+	depends on NET_TULIP && PCI && EXPERIMENTAL
+	select CRC32
+	---help---
+	  This driver is developed for the SMC EtherPower series Ethernet
+	  cards and also works with cards based on the DECchip
+	  21040 (Tulip series) chips.  Some LinkSys PCI cards are
+	  of this type.  (If your card is NOT SMC EtherPower 10/100 PCI
+	  (smc9332dst), you can also try the driver for "Generic DECchip"
+	  cards, below.  However, most people with a network card of this type
+	  will say Y here.) Do read the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called de2104x.
+
+config TULIP
+	tristate "DECchip Tulip (dc2114x) PCI support"
+	depends on NET_TULIP && PCI
+	select CRC32
+	---help---
+	  This driver is developed for the SMC EtherPower series Ethernet
+	  cards and also works with cards based on the DECchip 
+	  21140 (Tulip series) chips.  Some LinkSys PCI cards are
+	  of this type.  (If your card is NOT SMC EtherPower 10/100 PCI
+	  (smc9332dst), you can also try the driver for "Generic DECchip"
+	  cards, above.  However, most people with a network card of this type
+	  will say Y here.) Do read the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called tulip.
+
+config TULIP_MWI
+	bool "New bus configuration (EXPERIMENTAL)"
+	depends on TULIP && EXPERIMENTAL
+	help
+	  This configures your Tulip card specifically for the card and
+	  system cache line size type you are using.
+
+	  This is experimental code, not yet tested on many boards.
+
+	  If unsure, say N.
+
+config TULIP_MMIO
+	bool "Use PCI shared mem for NIC registers"
+	depends on TULIP
+	help
+	  Use PCI shared memory for the NIC registers, rather than going through
+	  the Tulip's PIO (programmed I/O ports).  Faster, but could produce
+	  obscure bugs if your mainboard has memory controller timing issues.
+	  If in doubt, say N.
+
+config TULIP_NAPI
+	bool "Use NAPI RX polling "
+	depends on TULIP
+	help
+	  NAPI is a new driver API designed to reduce CPU and interrupt load
+	  when the driver is receiving lots of packets from the card. It is
+	  still somewhat experimental and thus not yet enabled by default.
+
+	  If your estimated Rx load is 10kpps or more, or if the card will be
+	  deployed on potentially unfriendly networks (e.g. in a firewall),
+	  then say Y here.
+
+	  See <file:Documentation/networking/NAPI_HOWTO.txt> for more
+	  information.
+
+	  If in doubt, say N.
+
+config TULIP_NAPI_HW_MITIGATION
+	bool "Use Interrupt Mitigation "
+	depends on TULIP_NAPI
+	---help---
+	  Use HW to reduce RX interrupts. Not strict necessary since NAPI reduces
+	  RX interrupts but itself. Although this reduces RX interrupts even at
+	  low levels traffic at the cost of a small latency.
+
+	  If in doubt, say Y.
+
+config DE4X5
+	tristate "Generic DECchip & DIGITAL EtherWORKS PCI/EISA"
+	depends on NET_TULIP && (PCI || EISA)
+	select CRC32
+	---help---
+	  This is support for the DIGITAL series of PCI/EISA Ethernet cards.
+	  These include the DE425, DE434, DE435, DE450 and DE500 models.  If
+	  you have a network card of this type, say Y and read the
+	  Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>. More specific
+	  information is contained in
+	  <file:Documentation/networking/de4x5.txt>.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called de4x5.
+
+config WINBOND_840
+	tristate "Winbond W89c840 Ethernet support"
+	depends on NET_TULIP && PCI
+	select CRC32
+	select MII
+	help
+	  This driver is for the Winbond W89c840 chip.  It also works with 
+	  the TX9882 chip on the Compex RL100-ATX board.
+	  More specific information and updates are available from
+	  <http://www.scyld.com/network/drivers.html>.
+
+config DM9102
+	tristate "Davicom DM910x/DM980x support"
+	depends on NET_TULIP && PCI
+	select CRC32
+	---help---
+	  This driver is for DM9102(A)/DM9132/DM9801 compatible PCI cards from
+	  Davicom (<http://www.davicom.com.tw/>).  If you have such a network
+	  (Ethernet) card, say Y.  Some information is contained in the file
+	  <file:Documentation/networking/dmfe.txt>.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called dmfe.
+
+config PCMCIA_XIRCOM
+	tristate "Xircom CardBus support (new driver)"
+	depends on NET_TULIP && CARDBUS
+	---help---
+	  This driver is for the Digital "Tulip" Ethernet CardBus adapters.
+	  It should work with most DEC 21*4*-based chips/ethercards, as well
+	  as with work-alike chips from Lite-On (PNIC) and Macronix (MXIC) and
+	  ASIX.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called xircom_cb.  If unsure, say N.
+
+config PCMCIA_XIRTULIP
+	tristate "Xircom Tulip-like CardBus support (old driver)"
+	depends on NET_TULIP && CARDBUS && BROKEN_ON_SMP
+	select CRC32
+	---help---
+	  This driver is for the Digital "Tulip" Ethernet CardBus adapters.
+	  It should work with most DEC 21*4*-based chips/ethercards, as well
+	  as with work-alike chips from Lite-On (PNIC) and Macronix (MXIC) and
+	  ASIX.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>.  The module will
+	  be called xircom_tulip_cb.  If unsure, say N.
+
+endmenu
+
diff --git a/drivers/net/tulip/Makefile b/drivers/net/tulip/Makefile
new file mode 100644
index 00000000000..8bb9b468397
--- /dev/null
+++ b/drivers/net/tulip/Makefile
@@ -0,0 +1,17 @@
+#
+# Makefile for the Linux "Tulip" family network device drivers.
+#
+
+obj-$(CONFIG_PCMCIA_XIRTULIP)	+= xircom_tulip_cb.o
+obj-$(CONFIG_PCMCIA_XIRCOM)	+= xircom_cb.o
+obj-$(CONFIG_DM9102)		+= dmfe.o
+obj-$(CONFIG_WINBOND_840)	+= winbond-840.o
+obj-$(CONFIG_DE2104X)		+= de2104x.o
+obj-$(CONFIG_TULIP)		+= tulip.o
+obj-$(CONFIG_DE4X5)		+= de4x5.o
+
+# Declare multi-part drivers.
+
+tulip-objs			:= eeprom.o interrupt.o media.o \
+				   timer.o tulip_core.o		\
+				   21142.o pnic.o pnic2.o
diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c
new file mode 100644
index 00000000000..008e19210e6
--- /dev/null
+++ b/drivers/net/tulip/de2104x.c
@@ -0,0 +1,2187 @@
+/* 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 DRV_NAME		"de2104x"
+#define DRV_VERSION		"0.7"
+#define DRV_RELDATE		"Mar 17, 2004"
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.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 <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[] =
+KERN_INFO DRV_NAME " PCI Ethernet driver v" DRV_VERSION " (" DRV_RELDATE ")\n";
+
+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(__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 PFX			DRV_NAME ": "
+
+#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)
+
+#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)
+
+#define DE_UNALIGNED_16(a)	(u16)(get_unaligned((u16 *)(a)))
+
+/* 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,
+
+	/* 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),
+	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;
+
+struct de_srom_media_block {
+	u8			opts;
+	u16			csr13;
+	u16			csr14;
+	u16			csr15;
+} __attribute__((packed));
+
+struct de_srom_info_leaf {
+	u16			default_media;
+	u8			n_blocks;
+	u8			unused;
+} __attribute__((packed));
+
+struct de_desc {
+	u32			opts1;
+	u32			opts2;
+	u32			addr1;
+	u32			addr2;
+};
+
+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 struct pci_device_id 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, 0x6F3F, 0x6F3D, };
+static u16 t21041_csr15[] = { 0x0008, 0x0006, 0x000E, 0x0008, 0x0008, };
+
+
+#define dr32(reg)		readl(de->regs + (reg))
+#define dw32(reg,val)		writel((val), de->regs + (reg))
+
+
+static void de_rx_err_acct (struct de_private *de, unsigned rx_tail,
+			    u32 status, u32 len)
+{
+	if (netif_msg_rx_err (de))
+		printk (KERN_DEBUG
+			"%s: rx err, slot %d status 0x%x len %d\n",
+			de->dev->name, rx_tail, status, len);
+
+	if ((status & 0x38000300) != 0x0300) {
+		/* Ingore earlier buffers. */
+		if ((status & 0xffff) != 0x7fff) {
+			if (netif_msg_rx_err(de))
+				printk(KERN_WARNING "%s: Oversized Ethernet frame "
+					   "spanned multiple buffers, status %8.8x!\n",
+					   de->dev->name, 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;
+		if (!skb)
+			BUG();
+		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);
+
+		if (unlikely(netif_msg_rx_status(de)))
+			printk(KERN_DEBUG "%s: rx slot %d status 0x%x len %d copying? %d\n",
+			       de->dev->name, 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;
+		}
+		copy_skb->dev = de->dev;
+
+		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->tail,
+					       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);
+			memcpy(skb_put(copy_skb, len), skb->tail, 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;
+		de->dev->last_rx = jiffies;
+		rc = netif_rx (skb);
+		if (rc == NET_RX_DROP)
+			drop = 1;
+
+rx_next:
+		de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
+		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);
+		rx_tail = NEXT_RX(rx_tail);
+	}
+
+	if (!rx_work)
+		printk(KERN_WARNING "%s: rx work limit reached\n", de->dev->name);
+
+	de->rx_tail = rx_tail;
+}
+
+