patch-1.3.59 linux/drivers/net/3c59x.c

• Lines: 1034
• Date: Tue Jan 23 21:51:28 1996
• Orig file: v1.3.58/linux/drivers/net/3c59x.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.58/linux/drivers/net/3c59x.c linux/drivers/net/3c59x.c
@@ -0,0 +1,1033 @@
+/* 3c59x.c: A 3Com 3c590/3c595 "Vortex" ethernet driver for linux. */
+/*
+	Written 1995 by Donald Becker.
+
+	This software may be used and distributed according to the terms
+	of the GNU Public License, incorporated herein by reference.
+
+	This driver is for the 3Com "Vortex" series ethercards.  Members of
+	the series include the 3c590 PCI EtherLink III and 3c595-Tx PCI Fast
+	EtherLink.  It also works with the 10Mbs-only 3c590 PCI EtherLink III.
+
+	The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+	Center of Excellence in Space Data and Information Sciences
+	   Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+*/
+
+static char *version = "3c59x.c:v0.11 1/21/96 becker@cesdis.gsfc.nasa.gov\n";
+
+/* "Knobs" that turn on special features. */
+/* Use bus master transfers instead of programmed-I/O for the Tx process.
+   This is disabled by default! */
+#define VORTEX_BUS_MASTER
+
+/* Put out somewhat more debugging messages. (0 - no msg, 1 minimal msgs). */
+#define VORTEX_DEBUG 1
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/bios32.h>
+#include <linux/timer.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+/* The total size is twice that of the original EtherLinkIII series: the
+   runtime register window, window 1, is now always mapped in. */
+#define VORTEX_TOTAL_SIZE 0x20
+
+#ifdef HAVE_DEVLIST
+struct netdev_entry tc59x_drv =
+{"Vortex", vortex_pci_probe, VORTEX_TOTAL_SIZE, NULL};
+#endif
+
+#ifdef VORTEX_DEBUG
+int vortex_debug = VORTEX_DEBUG;
+#else
+int vortex_debug = 1;
+#endif
+
+static int product_ids[] = {0x5900, 0x5950, 0x5951, 0x5952, 0, 0};
+static const char *product_names[] = {
+	"3c590 Vortex 10Mbps",
+	"3c595 Vortex 100baseTX",
+	"3c595 Vortex 100baseT4",
+	"3c595 Vortex 100base-MII",
+	"EISA Vortex 3c597",
+};
+#define DEMON_INDEX 5			/* Caution!  Must be consistent with above! */
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the 3Com FastEtherLink, 3Com's PCI to
+10/100baseT adapter.  It also works with the 3c590, a similar product
+with only a 10Mbs interface.
+
+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 should be set to assign the
+PCI INTA signal to an otherwise unused system IRQ line.  While it's
+physically possible to shared PCI interrupt lines, the 1.2.0 kernel doesn't
+support it.
+
+III. Driver operation
+
+The 3c59x series use an interface that's very similar to the previous 3c5x9
+series.  The primary interface is two programmed-I/O FIFOs, with an
+alternate single-contiguous-region bus-master transfer (see next).
+
+One extension that is advertised in a very large font is that the adapters
+are capable of being bus masters.  Unfortunately this capability is only for
+a single contiguous region making it less useful than the list of transfer
+regions available with the DEC Tulip or AMD PCnet.  Given the significant
+performance impact of taking an extra interrupt for each transfer, using
+DMA transfers is a win only with large blocks.
+
+IIIC. Synchronization
+The driver runs as two independent, single-threaded flows of control.  One
+is the send-packet routine, which enforces single-threaded use by the
+dev->tbusy flag.  The other thread is the interrupt handler, which is single
+threaded by the hardware and other software.
+
+IV. Notes
+
+Thanks to Cameron Spitzer and Terry Murphy of 3Com for providing both
+3c590 and 3c595 boards.
+The name "Vortex" is the internal 3Com project name for the PCI ASIC, and
+the not-yet-released (3/95) EISA version is called "Demon".  According to
+Terry these names come from rides at the local amusement park.
+
+The new chips support both ethernet (1.5K) and FDDI (4.5K) packet sizes!
+This driver only supports ethernet packets because of the skbuff allocation
+limit of 4K.
+*/
+
+#define TCOM_VENDOR_ID	0x10B7		/* 3Com's manufacturer's ID. */
+
+/* Operational defintions.
+   These are not used by other compilation units and thus are not
+   exported in a ".h" file.
+
+   First the windows.  There are eight register windows, with the command
+   and status registers available in each.
+   */
+#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
+#define EL3_CMD 0x0e
+#define EL3_STATUS 0x0e
+
+/* The top five bits written to EL3_CMD are a command, the lower
+   11 bits are the parameter, if applicable.
+   Note that 11 parameters bits was fine for ethernet, but the new chip
+   can handle FDDI lenght frames (~4500 octets) and now parameters count
+   32-bit 'Dwords' rather than octets. */
+
+enum vortex_cmd {
+	TotalReset = 0<<11, SelectWindow = 1<<11, StartCoax = 2<<11,
+	RxDisable = 3<<11, RxEnable = 4<<11, RxReset = 5<<11, RxDiscard = 8<<11,
+	TxEnable = 9<<11, TxDisable = 10<<11, TxReset = 11<<11,
+	FakeIntr = 12<<11, AckIntr = 13<<11, SetIntrEnb = 14<<11,
+	SetStatusEnb = 15<<11, SetRxFilter = 16<<11, SetRxThreshold = 17<<11,
+	SetTxThreshold = 18<<11, SetTxStart = 19<<11,
+	StartDMAUp = 20<<11, StartDMADown = (20<<11)+1, StatsEnable = 21<<11,
+	StatsDisable = 22<<11, StopCoax = 23<<11,};
+
+/* The SetRxFilter command accepts the following classes: */
+enum RxFilter {
+	RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8 };
+
+/* Bits in the general status register. */
+enum vortex_status {
+	IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
+	TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
+	IntReq = 0x0040, StatsFull = 0x0080, DMADone = 1<<8,
+	DMAInProgress = 1<<11,			/* DMA controller is still busy.*/
+	CmdInProgress = 1<<12,			/* EL3_CMD is still busy.*/
+};
+
+/* Register window 1 offsets, the window used in normal operation.
+   On the Vortex this window is always mapped at offsets 0x10-0x1f. */
+enum Window1 {
+	TX_FIFO = 0x10,  RX_FIFO = 0x10,  RxErrors = 0x14,
+	RxStatus = 0x18,  Timer=0x1A, TxStatus = 0x1B,
+	TxFree = 0x1C, /* Remaining free bytes in Tx buffer. */
+};
+enum Window0 {
+	Wn0EepromCmd = 10,		/* Window 0: EEPROM command register. */
+};
+enum Win0_EEPROM_bits {
+	EEPROM_Read = 0x80, EEPROM_WRITE = 0x40, EEPROM_ERASE = 0xC0,
+	EEPROM_EWENB = 0x30,		/* Enable erasing/writing for 10 msec. */
+	EEPROM_EWDIS = 0x00,		/* Disable EWENB before 10 msec timeout. */
+};
+/* EEPROM locations. */
+enum eeprom_offset {
+	PhysAddr01=0, PhysAddr23=1, PhysAddr45=2, ModelID=3,
+	EtherLink3ID=7, IFXcvrIO=8, IRQLine=9,
+	NodeAddr01=10, NodeAddr23=11, NodeAddr45=12,
+	DriverTune=13, Checksum=15};
+
+enum Window3 {			/* Window 3: MAC/config bits. */
+	Wn3_Config=0, Wn3_MAC_Ctrl=6, Wn3_Options=8,
+};
+union wn3_config {
+	int i;
+	struct w3_config_fields {
+		unsigned int ram_size:3, ram_width:1, ram_speed:2, rom_size:2;
+		int pad8:8;
+		unsigned int ram_split:2, pad18:2, xcvr:3, pad21:1, autoselect:1;
+		int pad24:8;
+	} u;
+};
+
+enum Window4 {
+	Wn4_Media = 0x0A,		/* Window 4: Various transcvr/media bits. */
+};
+enum Win4_Media_bits {
+	Media_TP = 0x00C0,		/* Enable link beat and jabber for 10baseT. */
+};
+enum Window7 {					/* Window 7: Bus Master control. */
+	Wn7_MasterAddr = 0, Wn7_MasterLen = 6, Wn7_MasterStatus = 12,
+};
+
+struct vortex_private {
+	char devname[8];			/* "ethN" string, also for kernel debug. */
+	const char *product_name;
+	struct device *next_module;
+	struct enet_statistics stats;
+#ifdef VORTEX_BUS_MASTER
+	struct sk_buff *tx_skb;		/* Packet being eaten by bus master ctrl.  */
+#endif
+	struct timer_list timer;	/* Media selection timer. */
+	int options;				/* User-settable driver options (none yet). */
+	unsigned int media_override:3, full_duplex:1, bus_master:1, autoselect:1;
+};
+
+static char *if_names[] = {
+	"10baseT", "10Mbs AUI", "undefined", "10base2",
+	"100baseTX", "100baseFX", "MII", "undefined"};
+
+static int vortex_scan(struct device *dev);
+static int vortex_found_device(struct device *dev, int ioaddr, int irq,
+							   int product_index, int options);
+static int vortex_probe1(struct device *dev);
+static int vortex_open(struct device *dev);
+static void vortex_timer(unsigned long arg);
+static int vortex_start_xmit(struct sk_buff *skb, struct device *dev);
+static int vortex_rx(struct device *dev);
+static void vortex_interrupt(int irq, struct pt_regs *regs);
+static int vortex_close(struct device *dev);
+static void update_stats(int addr, struct device *dev);
+static struct enet_statistics *vortex_get_stats(struct device *dev);
+static void set_multicast_list(struct device *dev);
+
+
+/* Unlike the other PCI cards the 59x cards don't need a large contiguous
+   memory region, so making the driver a loadable module is feasible.
+
+   Unfortuneately maximizing the shared code between the integrated and
+   module version of the driver results in a complicated set of initialization
+   procedures.
+   init_module() -- modules /  tc59x_init()  -- built-in
+		The wrappers for vortex_scan()
+   vortex_scan()  		 The common routine that scans for PCI and EISA cards
+   vortex_found_device() Allocate a device structure when we find a card.
+					Different versions exist for modules and built-in.
+   vortex_probe1()		Fill in the device structure -- this is seperated
+					so that the modules code can put it in dev->init.
+*/
+/* This driver uses 'options' to pass the media type, full-duplex flag, etc. */
+/* Note: this is the only limit on the number of cards supported!! */
+int options[8] = { -1, -1, -1, -1, -1, -1, -1, -1,};
+
+#ifdef MODULE
+static int debug = -1;
+/* A list of all installed Vortex devices, for removing the driver module. */
+static struct device *root_vortex_dev = NULL;
+
+int
+init_module(void)
+{
+	int cards_found;
+
+	if (debug >= 0)
+		vortex_debug = debug;
+	if (vortex_debug)
+		printk(version);
+
+	root_vortex_dev = NULL;
+	cards_found = vortex_scan(0);
+	return cards_found < 0 ? cards_found : 0;
+}
+
+#else
+unsigned long tc59x_probe(struct device *dev)
+{
+	int cards_found = 0;
+
+	cards_found = vortex_scan(dev);
+
+	if (vortex_debug > 0  &&  cards_found)
+		printk(version);
+
+	return cards_found ? 0 : -ENODEV;
+}
+#endif  /* not MODULE */
+
+static int vortex_scan(struct device *dev)
+{
+	int cards_found = 0;
+
+	if (pcibios_present()) {
+		int pci_index;
+		for (pci_index = 0; pci_index < 8; pci_index++) {
+			unsigned char pci_bus, pci_device_fn, pci_irq_line, pci_latency;
+			unsigned int pci_ioaddr;
+			unsigned short pci_command;
+			int index;
+
+			for (index = 0; product_ids[index]; index++) {
+				if ( ! pcibios_find_device(TCOM_VENDOR_ID, product_ids[index],
+										   pci_index, &pci_bus,
+										   &pci_device_fn))
+					break;
+			}
+			if ( ! product_ids[index])
+				break;
+
+			pcibios_read_config_byte(pci_bus, pci_device_fn,
+									 PCI_INTERRUPT_LINE, &pci_irq_line);
+			pcibios_read_config_dword(pci_bus, pci_device_fn,
+									  PCI_BASE_ADDRESS_0, &pci_ioaddr);
+			/* Remove I/O space marker in bit 0. */
+			pci_ioaddr &= ~3;
+
+#ifdef VORTEX_BUS_MASTER
+			/* Get and check the bus-master and latency values.
+			   Some PCI BIOSes fail to set the master-enable bit, and
+			   the latency timer must be set to the maximum value to avoid
+			   data corruption that occurs when the timer expires during
+			   a transfer.  Yes, it's a bug. */
+			pcibios_read_config_word(pci_bus, pci_device_fn,
+									 PCI_COMMAND, &pci_command);
+			if ( ! (pci_command & PCI_COMMAND_MASTER)) {
+				printk("  PCI Master Bit has not been set! Setting...\n");
+				pci_command |= PCI_COMMAND_MASTER;
+				pcibios_write_config_word(pci_bus, pci_device_fn,
+										  PCI_COMMAND, pci_command);
+			}
+			pcibios_read_config_byte(pci_bus, pci_device_fn,
+										 PCI_LATENCY_TIMER, &pci_latency);
+			if (pci_latency != 255) {
+				printk("  Overriding PCI latency timer (CFLT) setting of %d, new value is 255.\n", pci_latency);
+				pcibios_write_config_byte(pci_bus, pci_device_fn,
+										  PCI_LATENCY_TIMER, 255);
+			}
+#endif  /* VORTEX_BUS_MASTER */
+			vortex_found_device(dev, pci_ioaddr, pci_irq_line,
+							   index, options[cards_found]);
+			dev = 0;
+			cards_found++;
+		}
+	}
+
+	/* Now check all slots of the EISA bus. */
+	if (EISA_bus) {
+		static int ioaddr = 0x1000;
+		for (ioaddr = 0x1000; ioaddr < 0x9000; ioaddr += 0x1000) {
+			/* Check the standard EISA ID register for an encoded '3Com'. */
+			if (inw(ioaddr + 0xC80) != 0x6d50)
+				continue;
+			/* Check for a product that we support. */
+			if ((inw(ioaddr + 0xC82) & 0xFFF0) != 0x5970
+				&& (inw(ioaddr + 0xC82) & 0xFFF0) != 0x5920)
+				continue;
+			vortex_found_device(dev, ioaddr, inw(ioaddr + 0xC88) >> 12,
+							   DEMON_INDEX, options[cards_found]);
+			dev = 0;
+			cards_found++;
+		}
+	}
+
+	return cards_found;
+}
+
+static int vortex_found_device(struct device *dev, int ioaddr, int irq,
+							   int product_index, int options)
+{
+	struct vortex_private *vp;
+
+#ifdef MODULE
+	/* Allocate and fill new device structure. */
+	int dev_size = sizeof(struct device) +
+		sizeof(struct vortex_private);
+	
+	dev = (struct device *) kmalloc(dev_size, GFP_KERNEL);
+	memset(dev, 0, dev_size);
+	dev->priv = ((void *)dev) + sizeof(struct device);
+	vp = (struct vortex_private *)dev->priv;
+	dev->name = vp->devname; /* An empty string. */
+	dev->base_addr = ioaddr;
+	dev->irq = irq;
+	dev->init = vortex_probe1;
+	vp->product_name = product_names[product_index];
+	vp->options = options;
+	if (options >= 0) {
+		vp->media_override = options & 7;
+		vp->full_duplex = (options & 8) ? 1 : 0;
+		vp->bus_master = (options & 16) ? 1 : 0;
+	} else {
+		vp->media_override = 7;
+		vp->full_duplex = 0;
+		vp->bus_master = 0;
+	}
+	ether_setup(dev);
+	vp->next_module = root_vortex_dev;
+	root_vortex_dev = dev;
+	if (register_netdev(dev) != 0)
+		return -EIO;
+#else  /* not a MODULE */
+	if (dev) {
+		dev->priv = kmalloc(sizeof (struct vortex_private), GFP_KERNEL);
+		memset(dev->priv, 0, sizeof (struct vortex_private));
+	}
+	dev = init_etherdev(dev, sizeof(struct vortex_private));
+	dev->base_addr = ioaddr;
+	dev->irq = irq;
+	vp  = (struct vortex_private *)dev->priv;
+	vp->product_name = product_names[product_index];
+	vp->options = options;
+	vortex_probe1(dev);
+#endif /* MODULE */
+	return 0;
+}
+
+static int vortex_probe1(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	int i;
+
+	printk("%s: 3Com %s at %#3x,", dev->name,
+		   vp->product_name, ioaddr);
+
+	/* Read the station address from the EEPROM. */
+	EL3WINDOW(0);
+	for (i = 0; i < 3; i++) {
+		short *phys_addr = (short *)dev->dev_addr;
+		int timer;
+		outw(EEPROM_Read + PhysAddr01 + i, ioaddr + Wn0EepromCmd);
+		/* Pause for at least 162 us. for the read to take place. */
+		for (timer = 0; timer < 162*4 + 400; timer++) {
+			SLOW_DOWN_IO;
+			if ((inw(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
+				break;
+		}
+		phys_addr[i] = htons(inw(ioaddr + 12));
+	}
+	for (i = 0; i < 6; i++)
+		printk("%c%2.2x", i ? ':' : ' ', dev->dev_addr[i]);
+	printk(", IRQ %d\n", dev->irq);
+	/* Tell them about an invalid IRQ. */
+	if (vortex_debug && (dev->irq <= 0 || dev->irq > 15))
+		printk(" *** Warning: this IRQ is unlikely to work!\n");
+
+	{
+		char *ram_split[] = {"5:3", "3:1", "1:1", "invalid"};
+		union wn3_config config;
+		EL3WINDOW(3);
+		config.i = inl(ioaddr + Wn3_Config);
+		if (vortex_debug > 1)
+			printk("  Internal config register is %4.4x, transceivers %#x.\n",
+				   config.i, inw(ioaddr + Wn3_Options));
+		printk("  %dK %s-wide RAM %s Rx:Tx split, %s%s interface.\n",
+			   8 << config.u.ram_size,
+			   config.u.ram_width ? "word" : "byte",
+			   ram_split[config.u.ram_split],
+			   config.u.autoselect ? "autoselect/" : "",
+			   if_names[config.u.xcvr]);
+		dev->if_port = config.u.xcvr;
+		vp->autoselect = config.u.autoselect;
+	}
+
+	/* We do a request_region() only to register /proc/ioports info. */
+	request_region(ioaddr, VORTEX_TOTAL_SIZE, vp->product_name);
+
+	/* The 3c59x-specific entries in the device structure. */
+	dev->open = &vortex_open;
+	dev->hard_start_xmit = &vortex_start_xmit;
+	dev->stop = &vortex_close;
+	dev->get_stats = &vortex_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+#if defined (HAVE_SET_MAC_ADDR) && 0
+	dev->set_mac_address = &set_mac_address;
+#endif
+
+	return 0;
+}
+
+
+static int
+vortex_open(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	union wn3_config config;
+	int i;
+
+	/* Before initializing select the active media port. */
+	EL3WINDOW(3);
+	if (vp->full_duplex)
+		outb(0x20, ioaddr + Wn3_MAC_Ctrl); /* Set the full-duplex bit. */
+	config.i = inl(ioaddr + Wn3_Config);
+
+	if (vp->media_override != 7) {
+		if (vortex_debug > 1)
+			printk("%s: Media override to transceiver %d (%s).\n",
+				   dev->name, vp->media_override, if_names[vp->media_override]);
+		config.u.xcvr = vp->media_override;
+		dev->if_port = vp->media_override;
+		outl(config.i, ioaddr + Wn3_Config);
+	}
+
+	if (vortex_debug > 1) {
+		printk("%s: vortex_open() InternalConfig %8.8x.\n",
+			dev->name, config.i);
+	}
+
+	outw(TxReset, ioaddr + EL3_CMD);
+	for (i = 20; i >= 0 ; i--)
+		if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+			break;
+
+	outw(RxReset, ioaddr + EL3_CMD);
+	/* Wait a few ticks for the RxReset command to complete. */
+	for (i = 20; i >= 0 ; i--)
+		if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+			break;
+
+	outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);
+
+	if (irq2dev_map[dev->irq] != NULL
+		|| (irq2dev_map[dev->irq] = dev) == NULL
+		|| dev->irq == 0
+		|| request_irq(dev->irq, &vortex_interrupt, 0, vp->product_name)) {
+		return -EAGAIN;
+	}
+
+	if (vortex_debug > 1) {
+		EL3WINDOW(4);
+		printk("%s: vortex_open() irq %d media status %4.4x.\n",
+			   dev->name, dev->irq, inw(ioaddr + Wn4_Media));
+	}
+
+	/* Set the station address and mask in window 2 each time opened. */
+	EL3WINDOW(2);
+	for (i = 0; i < 6; i++)
+		outb(dev->dev_addr[i], ioaddr + i);
+	for (; i < 12; i+=2)
+		outw(0, ioaddr + i);
+
+	if (dev->if_port == 3)
+		/* Start the thinnet transceiver. We should really wait 50ms...*/
+		outw(StartCoax, ioaddr + EL3_CMD);
+	else if (dev->if_port == 0) {
+		/* 10baseT interface, enabled link beat and jabber check. */
+		EL3WINDOW(4);
+		outw(inw(ioaddr + Wn4_Media) | Media_TP, ioaddr + Wn4_Media);
+	}
+
+	/* Switch to the stats window, and clear all stats by reading. */
+	outw(StatsDisable, ioaddr + EL3_CMD);
+	EL3WINDOW(6);
+	for (i = 0; i < 10; i++)	
+		inb(ioaddr + i);
+	inw(ioaddr + 10);
+	inw(ioaddr + 12);
+	/* New: On the Vortex we must also clear the BadSSD counter. */
+	EL3WINDOW(3);
+	inb(ioaddr + 12);
+
+	/* Switch to register set 7 for normal use. */
+	EL3WINDOW(7);
+
+	/* Accept b-case and phys addr only. */
+	outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
+	outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+
+	outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
+	outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
+	/* Allow status bits to be seen. */
+	outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
+	/* Ack all pending events, and set active indicator mask. */
+	outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
+		 ioaddr + EL3_CMD);
+	outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
+		 | DMADone, ioaddr + EL3_CMD);
+
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+
+	if (vp->autoselect) {
+		init_timer(&vp->timer);
+		vp->timer.expires = (14*HZ)/10; 			/* 1.4 sec. */
+		vp->timer.data = (unsigned long)dev;
+		vp->timer.function = &vortex_timer;    /* timer handler */
+		add_timer(&vp->timer);
+	}
+	return 0;
+}
+
+static void vortex_timer(unsigned long data)
+{
+	struct device *dev = (struct device *)data;
+	if (vortex_debug > 2)
+		printk("%s: Media selection timer tick happened.\n", dev->name);
+	/* ToDo: active media selection here! */
+}
+
+static int
+vortex_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+
+	/* Transmitter timeout, serious problems. */
+	if (dev->tbusy) {
+		int tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < 40)
+			return 1;
+		printk("%s: transmit timed out, tx_status %2.2x status %4.4x.\n",
+			   dev->name, inb(ioaddr + TxStatus), inw(ioaddr + EL3_STATUS));
+		vp->stats.tx_errors++;
+		/* Issue TX_RESET and TX_START commands. */
+		outw(TxReset, ioaddr + EL3_CMD);
+		{
+			int i;
+			for (i = 20; i >= 0 ; i--)
+				if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+					break;
+		}
+		outw(TxEnable, ioaddr + EL3_CMD);
+		dev->trans_start = jiffies;
+		dev->tbusy = 0;
+		return 0;
+	}
+
+	if (skb == NULL || skb->len <= 0) {
+		printk("%s: Obsolete driver layer request made: skbuff==NULL.\n",
+			   dev->name);
+		dev_tint(dev);
+		return 0;
+	}
+
+	/* Block a timer-based transmit from overlapping.  This could better be
+	   done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+	   If this ever occurs the queue layer is doing something evil! */
+	if (set_bit(0, (void*)&dev->tbusy) != 0) {
+		printk("%s: Transmitter access conflict.\n", dev->name);
+		return 1;
+	}
+
+	/* Put out the doubleword header... */
+	outl(skb->len, ioaddr + TX_FIFO);
+#ifdef VORTEX_BUS_MASTER
+	if (vp->bus_master) {
+		/* Set the bus-master controller to transfer the packet. */
+		outl((int)(skb->data), ioaddr + Wn7_MasterAddr);
+		outw((skb->len + 3) & ~3, ioaddr + Wn7_MasterLen);
+		vp->tx_skb = skb;
+		outw(StartDMADown, ioaddr + EL3_CMD);
+	} else {
+		/* ... and the packet rounded to a doubleword. */
+		outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
+		dev_kfree_skb (skb, FREE_WRITE);
+		if (inw(ioaddr + TxFree) > 1536) {
+			dev->tbusy = 0;
+		} else
+			/* Interrupt us when the FIFO has room for max-sized packet. */
+			outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);
+	}
+#else
+	/* ... and the packet rounded to a doubleword. */
+	outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
+	dev_kfree_skb (skb, FREE_WRITE);
+	if (inw(ioaddr + TxFree) > 1536) {
+		dev->tbusy = 0;
+	} else
+		/* Interrupt us when the FIFO has room for max-sized packet. */
+		outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);
+#endif  /* bus master */
+
+	dev->trans_start = jiffies;
+
+	/* Clear the Tx status stack. */
+	{
+		short tx_status;
+		int i = 4;
+
+		while (--i > 0	&&	(tx_status = inb(ioaddr + TxStatus)) > 0) {
+			if (tx_status & 0x3C) {		/* A Tx-disabling error occured.  */
+				if (vortex_debug > 2)
+				  printk("%s: Tx error, status %2.2x.\n",
+						 dev->name, tx_status);
+				if (tx_status & 0x04) vp->stats.tx_fifo_errors++;
+				if (tx_status & 0x38) vp->stats.tx_aborted_errors++;
+				if (tx_status & 0x30) {
+					int j;
+					outw(TxReset, ioaddr + EL3_CMD);
+					for (j = 20; j >= 0 ; j--)
+						if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+							break;
+				}
+				outw(TxEnable, ioaddr + EL3_CMD);
+			}
+			outb(0x00, ioaddr + TxStatus); /* Pop the status stack. */
+		}
+	}
+	return 0;
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static void vortex_interrupt(int irq, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *)(irq2dev_map[irq]);
+	struct vortex_private *lp;
+	int ioaddr, status;
+	int latency;
+	int i = 0;
+
+	if (dev == NULL) {
+		printk ("vortex_interrupt(): irq %d for unknown device.\n", irq);
+		return;
+	}
+
+	if (dev->interrupt)
+		printk("%s: Re-entering the interrupt handler.\n", dev->name);
+	dev->interrupt = 1;
+
+	ioaddr = dev->base_addr;
+	latency = inb(ioaddr + Timer);
+	lp = (struct vortex_private *)dev->priv;
+
+	status = inw(ioaddr + EL3_STATUS);
+
+	if (vortex_debug > 4)
+		printk("%s: interrupt, status %4.4x, timer %d.\n", dev->name,
+			   status, latency);
+	if ((status & 0xE000) != 0xE000) {
+		static int donedidthis=0;
+		/* Some interrupt controllers store a bogus interrupt from boot-time.
+		   Ignore a single early interrupt, but don't hang the machine for
+		   other interrupt problems. */
+		if (donedidthis++ > 1) {
+			printk("%s: Bogus interrupt, bailing. Status %4.4x, start=%d.\n",
+				   dev->name, status, dev->start);
+			free_irq(dev->irq);
+		}
+	}
+
+	do {
+		if (vortex_debug > 5)
+				printk("%s: In interrupt loop, status %4.4x.\n",
+					   dev->name, status);
+		if (status & RxComplete)
+			vortex_rx(dev);
+
+		if (status & TxAvailable) {
+			if (vortex_debug > 5)
+				printk("	TX room bit was handled.\n");
+			/* There's room in the FIFO for a full-sized packet. */
+			outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
+			dev->tbusy = 0;
+			mark_bh(NET_BH);
+		}
+#ifdef VORTEX_BUS_MASTER
+		if (status & DMADone) {
+			outw(0x1000, ioaddr + Wn7_MasterStatus); /* Ack the event. */
+			dev->tbusy = 0;
+			mark_bh(NET_BH);
+		}
+#endif
+		if (status & (AdapterFailure | RxEarly | StatsFull)) {
+			/* Handle all uncommon interrupts at once. */
+			if (status & RxEarly) {				/* Rx early is unused. */
+				vortex_rx(dev);
+				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
+			}
+			if (status & StatsFull) { 	/* Empty statistics. */
+				static int DoneDidThat = 0;
+				if (vortex_debug > 4)
+					printk("%s: Updating stats.\n", dev->name);
+				update_stats(ioaddr, dev);
+				/* DEBUG HACK: Disable statistics as an interrupt source. */
+				/* This occurs when we have the wrong media type! */
+				if (DoneDidThat == 0  &&
+					inw(ioaddr + EL3_STATUS) & StatsFull) {
+					int win, reg;
+					printk("%s: Updating stats failed, disabling stats as an"
+						   " interrupt source.\n", dev->name);
+					for (win = 0; win < 8; win++) {
+						EL3WINDOW(win);
+						printk("\n Vortex window %d:", win);
+						for (reg = 0; reg < 16; reg++)
+							printk(" %2.2x", inb(ioaddr+reg));
+					}
+					EL3WINDOW(7);
+					outw(SetIntrEnb | 0x18, ioaddr + EL3_CMD);
+					DoneDidThat++;
+				}
+			}
+			if (status & AdapterFailure) {
+				/* Adapter failure requires Rx reset and reinit. */
+				outw(RxReset, ioaddr + EL3_CMD);
+				/* Set the Rx filter to the current state. */
+				outw(SetRxFilter | RxStation | RxBroadcast
+					 | (dev->flags & IFF_ALLMULTI ? RxMulticast : 0)
+					 | (dev->flags & IFF_PROMISC ? RxProm : 0),
+					 ioaddr + EL3_CMD);
+				outw(RxEnable, ioaddr + EL3_CMD); /* Re-enable the receiver. */
+				outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
+			}
+		}
+
+		if (++i > 10) {
+			printk("%s: Infinite loop in interrupt, status %4.4x.  "
+				   "Disabling functions (%4.4x).\n",
+				   dev->name, status, SetStatusEnb | ((~status) & 0xFE));
+			/* Disable all pending interrupts. */
+			outw(SetStatusEnb | ((~status) & 0xFE), ioaddr + EL3_CMD);
+			outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
+			break;
+		}
+		/* Acknowledge the IRQ. */
+		outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
+
+	} while ((status = inw(ioaddr + EL3_STATUS)) & (IntLatch | RxComplete));
+
+	if (vortex_debug > 4)
+		printk("%s: exiting interrupt, status %4.4x.\n", dev->name, status);
+
+	dev->interrupt = 0;
+	return;
+}
+
+static int
+vortex_rx(struct device *dev)
+{
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+	int i;
+	short rx_status;
+
+	if (vortex_debug > 5)
+		printk("   In rx_packet(), status %4.4x, rx_status %4.4x.\n",
+			   inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
+	while ((rx_status = inw(ioaddr + RxStatus)) > 0) {
+		if (rx_status & 0x4000) { /* Error, update stats. */
+			unsigned char rx_error = inb(ioaddr + RxErrors);
+			if (vortex_debug > 4)
+				printk(" Rx error: status %2.2x.\n", rx_error);
+			vp->stats.rx_errors++;
+			if (rx_error & 0x01)  vp->stats.rx_over_errors++;
+			if (rx_error & 0x02)  vp->stats.rx_length_errors++;
+			if (rx_error & 0x04)  vp->stats.rx_frame_errors++;
+			if (rx_error & 0x08)  vp->stats.rx_crc_errors++;
+			if (rx_error & 0x10)  vp->stats.rx_length_errors++;
+		} else {
+			/* The packet length: up to 4.5K!. */
+			short pkt_len = rx_status & 0x1fff;
+			struct sk_buff *skb;
+
+			skb = dev_alloc_skb(pkt_len + 5);
+			if (vortex_debug > 4)
+				printk("Receiving packet size %d status %4.4x.\n",
+					   pkt_len, rx_status);
+			if (skb != NULL) {
+				skb->dev = dev;
+				skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
+				/* 'skb_put()' points to the start of sk_buff data area. */
+				insl(ioaddr + RX_FIFO, skb_put(skb, pkt_len),
+					 (pkt_len + 3) >> 2);
+				skb->protocol = eth_type_trans(skb, dev);
+				netif_rx(skb);
+				outw(RxDiscard, ioaddr + EL3_CMD); /* Pop top Rx packet. */
+				/* Wait a limited time to go to next packet. */
+				for (i = 200; i >= 0; i--)
+					if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+						break;
+				vp->stats.rx_packets++;
+				continue;
+			} else if (vortex_debug)
+				printk("%s: Couldn't allocate a sk_buff of size %d.\n",
+					   dev->name, pkt_len);
+		}
+		vp->stats.rx_dropped++;
+		outw(RxDiscard, ioaddr + EL3_CMD);
+		/* Wait a limited time to skip this packet. */
+		for (i = 200; i >= 0; i--)
+			if ( ! inw(ioaddr + EL3_STATUS) & CmdInProgress)
+				break;
+	}
+
+	return 0;
+}
+
+static int
+vortex_close(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+
+	dev->start = 0;
+	dev->tbusy = 1;
+
+	if (vortex_debug > 1)
+		printk("%s: vortex_close() status %4.4x, Tx status %2.2x.\n",
+			   dev->name, inw(ioaddr + EL3_STATUS), inb(ioaddr + TxStatus));
+
+	/* Turn off statistics ASAP.  We update lp->stats below. */
+	outw(StatsDisable, ioaddr + EL3_CMD);
+
+	/* Disable the receiver and transmitter. */
+	outw(RxDisable, ioaddr + EL3_CMD);
+	outw(TxDisable, ioaddr + EL3_CMD);
+
+	if (dev->if_port == 3)
+		/* Turn off thinnet power.  Green! */
+		outw(StopCoax, ioaddr + EL3_CMD);
+	else if (dev->if_port == 0) {
+		/* Disable link beat and jabber, if_port may change ere next open(). */
+		EL3WINDOW(4);
+		outw(inw(ioaddr + Wn4_Media) & ~Media_TP, ioaddr + Wn4_Media);
+	}
+
+	free_irq(dev->irq);
+	/* Mmmm, we should diable all interrupt sources here. */
+	irq2dev_map[dev->irq] = 0;
+
+	update_stats(ioaddr, dev);
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+
+	return 0;
+}
+
+static struct enet_statistics *
+vortex_get_stats(struct device *dev)
+{
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	update_stats(dev->base_addr, dev);
+	restore_flags(flags);
+	return &vp->stats;
+}
+
+/*  Update statistics.
+	Unlike with the EL3 we need not worry about interrupts changing
+	the window setting from underneath us, but we must still guard
+	against a race condition with a StatsUpdate interrupt updating the
+	table.  This is done by checking that the ASM (!) code generated uses
+	atomic updates with '+='.
+	*/
+static void update_stats(int ioaddr, struct device *dev)
+{
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+
+	/* Unlike the 3c5x9 we need not turn off stats updates while reading. */
+	/* Switch to the stats window, and read everything. */
+	EL3WINDOW(6);
+	vp->stats.tx_carrier_errors		+= inb(ioaddr + 0);
+	vp->stats.tx_heartbeat_errors	+= inb(ioaddr + 1);
+	/* Multiple collisions. */		inb(ioaddr + 2);
+	vp->stats.collisions			+= inb(ioaddr + 3);
+	vp->stats.tx_window_errors		+= inb(ioaddr + 4);
+	vp->stats.rx_fifo_errors		+= inb(ioaddr + 5);
+	vp->stats.tx_packets			+= inb(ioaddr + 6);
+	vp->stats.tx_packets			+= (inb(ioaddr + 9)&15) << 8;
+	/* Rx packets	*/				inb(ioaddr + 7);   /* Must read to clear */
+	/* Tx deferrals */				inb(ioaddr + 8);
+	/* Don't bother with register 9, an extention of registers 6&7.
+	   If we do use the 6&7 values the atomic update assumption above
+	   is invalid. */
+	inw(ioaddr + 10);	/* Total Rx and Tx octets. */
+	inw(ioaddr + 12);
+	/* New: On the Vortex we must also clear the BadSSD counter. */
+	EL3WINDOW(3);
+	inb(ioaddr + 12);
+
+	/* We change back to window 7 (not 1) with the Vortex. */
+	EL3WINDOW(7);
+	return;
+}
+
+/* There are two version of set_multicast_list() to support both v1.2 and
+   v1.4 kernels. */
+static void
+set_multicast_list(struct device *dev)
+{
+	short ioaddr = dev->base_addr;
+
+	if ((dev->mc_list)  ||  (dev->flags & IFF_ALLMULTI)) {
+		outw(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
+		if (vortex_debug > 3) {
+			printk("%s: Setting Rx multicast mode, %d addresses.\n",
+				   dev->name, dev->mc_count);
+		}
+	} else if (dev->flags & IFF_PROMISC) {
+		outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
+			 ioaddr + EL3_CMD);
+	} else
+		outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
+}
+
+
+#ifdef MODULE
+void
+cleanup_module(void)
+{
+	struct device *next_dev;
+
+	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
+	while (root_vortex_dev) {
+		next_dev = ((struct vortex_private *)root_vortex_dev->priv)->next_module;
+		unregister_netdev(root_vortex_dev);
+		release_region(root_vortex_dev->base_addr, VORTEX_TOTAL_SIZE);
+		kfree(root_vortex_dev);
+		root_vortex_dev = next_dev;
+	}
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c 3c59x.c -o 3c59x.o"
+ *  c-indent-level: 4
+ *  tab-width: 4
+ * End:
+ */