1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 842 insertions, 0 deletions

diff --git a/linux/src/drivers/net/3c509.c b/linux/src/drivers/net/3c509.c
new file mode 100644
index 00000000..f8842882
--- /dev/null
+++ b/linux/src/drivers/net/3c509.c
@@ -0,0 +1,842 @@
+/* 3c509.c: A 3c509 EtherLink3 ethernet driver for linux. */
+/*
+	Written 1993-1998 by Donald Becker.
+
+	Copyright 1994-1998 by Donald Becker.
+	Copyright 1993 United States Government as represented by the
+	Director, National Security Agency.	 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 EtherLinkIII series.
+
+	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
+
+	Known limitations:
+	Because of the way 3c509 ISA detection works it's difficult to predict
+	a priori which of several ISA-mode cards will be detected first.
+
+	This driver does not use predictive interrupt mode, resulting in higher
+	packet latency but lower overhead.  If interrupts are disabled for an
+	unusually long time it could also result in missed packets, but in
+	practice this rarely happens.
+
+
+	FIXES:
+		Alan Cox:       Removed the 'Unexpected interrupt' bug.
+		Michael Meskes:	Upgraded to Donald Becker's version 1.07.
+		Alan Cox:	Increased the eeprom delay. Regardless of 
+				what the docs say some people definitely
+				get problems with lower (but in card spec)
+				delays
+		v1.10 4/21/97 Fixed module code so that multiple cards may be detected,
+				other cleanups.  -djb
+		v1.13 9/8/97 Made 'max_interrupt_work' an insmod-settable variable -djb
+		v1.14 10/15/97 Avoided waiting..discard message for fast machines -djb
+		v1.15 1/31/98 Faster recovery for Tx errors. -djb
+		v1.16 2/3/98 Different ID port handling to avoid sound cards. -djb
+*/
+
+static char *version = "3c509.c:1.16 2/3/98 becker@cesdis.gsfc.nasa.gov\n";
+/* A few values that may be tweaked. */
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (400*HZ/1000)
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 10;
+
+#include <linux/module.h>
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/malloc.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/config.h>	/* for CONFIG_MCA */
+#include <linux/delay.h>	/* for udelay() */
+
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#ifdef EL3_DEBUG
+int el3_debug = EL3_DEBUG;
+#else
+int el3_debug = 2;
+#endif
+
+/* To minimize the size of the driver source I only define operating
+   constants if they are used several times.  You'll need the manual
+   anyway if you want to understand driver details. */
+/* Offsets from base I/O address. */
+#define EL3_DATA 0x00
+#define EL3_CMD 0x0e
+#define EL3_STATUS 0x0e
+#define	 EEPROM_READ 0x80
+
+#define EL3_IO_EXTENT	16
+
+#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
+
+
+/* The top five bits written to EL3_CMD are a command, the lower
+   11 bits are the parameter, if applicable. */
+enum c509cmd {
+	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, StatsEnable = 21<<11,
+	StatsDisable = 22<<11, StopCoax = 23<<11,};
+
+enum c509status {
+	IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
+	TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
+	IntReq = 0x0040, StatsFull = 0x0080, CmdBusy = 0x1000, };
+
+/* The SetRxFilter command accepts the following classes: */
+enum RxFilter {
+	RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8 };
+
+/* Register window 1 offsets, the window used in normal operation. */
+#define TX_FIFO		0x00
+#define RX_FIFO		0x00
+#define RX_STATUS 	0x08
+#define TX_STATUS 	0x0B
+#define TX_FREE		0x0C		/* Remaining free bytes in Tx buffer. */
+
+#define WN0_IRQ		0x08		/* Window 0: Set IRQ line in bits 12-15. */
+#define WN4_MEDIA	0x0A		/* Window 4: Various transcvr/media bits. */
+#define  MEDIA_TP	0x00C0		/* Enable link beat and jabber for 10baseT. */
+
+/*
+ * Must be a power of two (we use a binary and in the
+ * circular queue)
+ */
+#define SKB_QUEUE_SIZE	64
+
+struct el3_private {
+	struct enet_statistics stats;
+	struct device *next_dev;
+	/* skb send-queue */
+	int head, size;
+	struct sk_buff *queue[SKB_QUEUE_SIZE];
+};
+static int id_port = 0x110;		/* Start with 0x110 to avoid new sound cards.*/
+static struct device *el3_root_dev = NULL;
+
+static ushort id_read_eeprom(int index);
+static ushort read_eeprom(int ioaddr, int index);
+static int el3_open(struct device *dev);
+static int el3_start_xmit(struct sk_buff *skb, struct device *dev);
+static void el3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void update_stats(int addr, struct device *dev);
+static struct enet_statistics *el3_get_stats(struct device *dev);
+static int el3_rx(struct device *dev);
+static int el3_close(struct device *dev);
+static void set_multicast_list(struct device *dev);
+
+
+
+int el3_probe(struct device *dev)
+{
+	short lrs_state = 0xff, i;
+	int ioaddr, irq, if_port;
+	u16 phys_addr[3];
+	static int current_tag = 0;
+
+	/* First check all slots of the EISA bus.  The next slot address to
+	   probe is kept in 'eisa_addr' to support multiple probe() calls. */
+	if (EISA_bus) {
+		static int eisa_addr = 0x1000;
+		while (eisa_addr < 0x9000) {
+			ioaddr = eisa_addr;
+			eisa_addr += 0x1000;
+
+			/* Check the standard EISA ID register for an encoded '3Com'. */
+			if (inw(ioaddr + 0xC80) != 0x6d50)
+				continue;
+
+			/* Change the register set to the configuration window 0. */
+			outw(SelectWindow | 0, ioaddr + 0xC80 + EL3_CMD);
+
+			irq = inw(ioaddr + WN0_IRQ) >> 12;
+			if_port = inw(ioaddr + 6)>>14;
+			for (i = 0; i < 3; i++)
+				phys_addr[i] = htons(read_eeprom(ioaddr, i));
+
+			/* Restore the "Product ID" to the EEPROM read register. */
+			read_eeprom(ioaddr, 3);
+
+			/* Was the EISA code an add-on hack?  Nahhhhh... */
+			goto found;
+		}
+	}
+
+#ifdef CONFIG_MCA
+	if (MCA_bus) {
+		mca_adaptor_select_mode(1);
+		for (i = 0; i < 8; i++)
+			if ((mca_adaptor_id(i) | 1) == 0x627c) {
+				ioaddr = mca_pos_base_addr(i);
+				irq = inw(ioaddr + WN0_IRQ) >> 12;
+				if_port = inw(ioaddr + 6)>>14;
+				for (i = 0; i < 3; i++)
+					phys_addr[i] = htons(read_eeprom(ioaddr, i));
+
+				mca_adaptor_select_mode(0);
+				goto found;
+			}
+		mca_adaptor_select_mode(0);
+
+	}
+#endif
+
+	/* Reset the ISA PnP mechanism on 3c509b. */
+	outb(0x02, 0x279);           /* Select PnP config control register. */
+	outb(0x02, 0xA79);           /* Return to WaitForKey state. */
+	/* Select an open I/O location at 0x1*0 to do contention select. */
+	for ( ; id_port < 0x200; id_port += 0x10) {
+		if (check_region(id_port, 1))
+			continue;
+		outb(0x00, id_port);
+		outb(0xff, id_port);
+		if (inb(id_port) & 0x01)
+			break;
+	}
+	if (id_port >= 0x200) {             /* GCC optimizes this test out. */
+		/* Rare -- do we really need a warning? */
+		printk(" WARNING: No I/O port available for 3c509 activation.\n");
+		return -ENODEV;
+	}
+	/* Next check for all ISA bus boards by sending the ID sequence to the
+	   ID_PORT.  We find cards past the first by setting the 'current_tag'
+	   on cards as they are found.  Cards with their tag set will not
+	   respond to subsequent ID sequences. */
+
+	outb(0x00, id_port);
+	outb(0x00, id_port);
+	for(i = 0; i < 255; i++) {
+		outb(lrs_state, id_port);
+		lrs_state <<= 1;
+		lrs_state = lrs_state & 0x100 ? lrs_state ^ 0xcf : lrs_state;
+	}
+
+	/* For the first probe, clear all board's tag registers. */
+	if (current_tag == 0)
+		outb(0xd0, id_port);
+	else				/* Otherwise kill off already-found boards. */
+		outb(0xd8, id_port);
+
+	if (id_read_eeprom(7) != 0x6d50) {
+		return -ENODEV;
+	}
+
+	/* Read in EEPROM data, which does contention-select.
+	   Only the lowest address board will stay "on-line".
+	   3Com got the byte order backwards. */
+	for (i = 0; i < 3; i++) {
+		phys_addr[i] = htons(id_read_eeprom(i));
+	}
+
+	{
+		unsigned int iobase = id_read_eeprom(8);
+		if_port = iobase >> 14;
+		ioaddr = 0x200 + ((iobase & 0x1f) << 4);
+	}
+	irq = id_read_eeprom(9) >> 12;
+
+	if (dev) {					/* Set passed-in IRQ or I/O Addr. */
+		if (dev->irq > 1  &&  dev->irq < 16)
+			irq = dev->irq;
+
+		if (dev->base_addr) {
+			if (dev->mem_end == 0x3c509 			/* Magic key */
+				&& dev->base_addr >= 0x200  &&  dev->base_addr <= 0x3e0)
+				ioaddr = dev->base_addr & 0x3f0;
+			else if (dev->base_addr != ioaddr)
+				return -ENODEV;
+		}
+	}
+
+	/* Set the adaptor tag so that the next card can be found. */
+	outb(0xd0 + ++current_tag, id_port);
+
+	/* Activate the adaptor at the EEPROM location. */
+	outb((ioaddr >> 4) | 0xe0, id_port);
+
+	EL3WINDOW(0);
+	if (inw(ioaddr) != 0x6d50)
+		return -ENODEV;
+
+	/* Free the interrupt so that some other card can use it. */
+	outw(0x0f00, ioaddr + WN0_IRQ);
+ found:
+	if (dev == NULL) {
+		dev = init_etherdev(dev, sizeof(struct el3_private));
+	}
+	memcpy(dev->dev_addr, phys_addr, sizeof(phys_addr));
+	dev->base_addr = ioaddr;
+	dev->irq = irq;
+	dev->if_port = (dev->mem_start & 0x1f) ? dev->mem_start & 3 : if_port;
+
+	request_region(dev->base_addr, EL3_IO_EXTENT, "3c509");
+
+	{
+		const char *if_names[] = {"10baseT", "AUI", "undefined", "BNC"};
+		printk("%s: 3c509 at %#3.3lx tag %d, %s port, address ",
+			   dev->name, dev->base_addr, current_tag, if_names[dev->if_port]);
+	}
+
+	/* Read in the station address. */
+	for (i = 0; i < 6; i++)
+		printk(" %2.2x", dev->dev_addr[i]);
+	printk(", IRQ %d.\n", dev->irq);
+
+	/* Make up a EL3-specific-data structure. */
+	if (dev->priv == NULL)
+		dev->priv = kmalloc(sizeof(struct el3_private), GFP_KERNEL);
+	if (dev->priv == NULL)
+		return -ENOMEM;
+	memset(dev->priv, 0, sizeof(struct el3_private));
+
+	((struct el3_private *)dev->priv)->next_dev = el3_root_dev;
+	el3_root_dev = dev;
+
+	if (el3_debug > 0)
+		printk(version);
+
+	/* The EL3-specific entries in the device structure. */
+	dev->open = &el3_open;
+	dev->hard_start_xmit = &el3_start_xmit;
+	dev->stop = &el3_close;
+	dev->get_stats = &el3_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+
+	/* Fill in the generic fields of the device structure. */
+	ether_setup(dev);
+	return 0;
+}
+
+/* Read a word from the EEPROM using the regular EEPROM access register.
+   Assume that we are in register window zero.
+ */
+static ushort read_eeprom(int ioaddr, int index)
+{
+	outw(EEPROM_READ + index, ioaddr + 10);
+	/* Pause for at least 162 us. for the read to take place. */
+	udelay (500);
+	return inw(ioaddr + 12);
+}
+
+/* Read a word from the EEPROM when in the ISA ID probe state. */
+static ushort id_read_eeprom(int index)
+{
+	int bit, word = 0;
+
+	/* Issue read command, and pause for at least 162 us. for it to complete.
+	   Assume extra-fast 16Mhz bus. */
+	outb(EEPROM_READ + index, id_port);
+
+	/* Pause for at least 162 us. for the read to take place. */
+	udelay (500);
+	
+	for (bit = 15; bit >= 0; bit--)
+		word = (word << 1) + (inb(id_port) & 0x01);
+
+	if (el3_debug > 3)
+		printk("  3c509 EEPROM word %d %#4.4x.\n", index, word);
+
+	return word;
+}
+
+
+
+static int
+el3_open(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+	int i;
+
+	outw(TxReset, ioaddr + EL3_CMD);
+	outw(RxReset, ioaddr + EL3_CMD);
+	outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);
+
+	if (request_irq(dev->irq, &el3_interrupt, 0, "3c509", dev)) {
+		return -EAGAIN;
+	}
+
+	EL3WINDOW(0);
+	if (el3_debug > 3)
+		printk("%s: Opening, IRQ %d	 status@%x %4.4x.\n", dev->name,
+			   dev->irq, ioaddr + EL3_STATUS, inw(ioaddr + EL3_STATUS));
+
+	/* Activate board: this is probably unnecessary. */
+	outw(0x0001, ioaddr + 4);
+
+	/* Set the IRQ line. */
+	outw((dev->irq << 12) | 0x0f00, ioaddr + WN0_IRQ);
+
+	/* Set the station address in window 2 each time opened. */
+	EL3WINDOW(2);
+
+	for (i = 0; i < 6; i++)
+		outb(dev->dev_addr[i], 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 < 9; i++)
+		inb(ioaddr + i);
+	inw(ioaddr + 10);
+	inw(ioaddr + 12);
+
+	/* Switch to register set 1 for normal use. */
+	EL3WINDOW(1);
+
+	/* Accept b-case and phys addr only. */
+	outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
+	outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
+
+	dev->interrupt = 0;
+	dev->tbusy = 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|TxComplete|RxComplete|StatsFull,
+		 ioaddr + EL3_CMD);
+
+	if (el3_debug > 3)
+		printk("%s: Opened 3c509  IRQ %d  status %4.4x.\n",
+			   dev->name, dev->irq, inw(ioaddr + EL3_STATUS));
+
+	MOD_INC_USE_COUNT;
+	return 0;					/* Always succeed */
+}
+
+static int
+el3_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+	struct el3_private *lp = (struct el3_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+
+	/* Transmitter timeout, serious problems. */
+	if (dev->tbusy) {
+		int tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < TX_TIMEOUT)
+			return 1;
+		printk("%s: transmit timed out, Tx_status %2.2x status %4.4x "
+			   "Tx FIFO room %d.\n",
+			   dev->name, inb(ioaddr + TX_STATUS), inw(ioaddr + EL3_STATUS),
+			   inw(ioaddr + TX_FREE));
+		lp->stats.tx_errors++;
+		dev->trans_start = jiffies;
+		/* Issue TX_RESET and TX_START commands. */
+		outw(TxReset, ioaddr + EL3_CMD);
+		outw(TxEnable, ioaddr + EL3_CMD);
+		dev->tbusy = 0;
+	}
+
+	if (el3_debug > 4) {
+		printk("%s: el3_start_xmit(length = %ld) called, status %4.4x.\n",
+			   dev->name, skb->len, inw(ioaddr + EL3_STATUS));
+	}
+#if 0
+#ifndef final_version
+	{	/* Error-checking code, delete someday. */
+		ushort status = inw(ioaddr + EL3_STATUS);
+		if (status & 0x0001 		/* IRQ line active, missed one. */
+			&& inw(ioaddr + EL3_STATUS) & 1) { 			/* Make sure. */
+			printk("%s: Missed interrupt, status then %04x now %04x"
+				   "  Tx %2.2x Rx %4.4x.\n", dev->name, status,
+				   inw(ioaddr + EL3_STATUS), inb(ioaddr + TX_STATUS),
+				   inw(ioaddr + RX_STATUS));
+			/* Fake interrupt trigger by masking, acknowledge interrupts. */
+			outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);
+			outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
+				 ioaddr + EL3_CMD);
+			outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
+		}
+	}
+#endif
+#endif
+	/* Avoid timer-based retransmission conflicts. */
+	if (set_bit(0, (void*)&dev->tbusy) != 0)
+		printk("%s: Transmitter access conflict.\n", dev->name);
+	else {
+		/* Put out the doubleword header... */
+		outw(skb->len, ioaddr + TX_FIFO);
+		outw(0x00, ioaddr + TX_FIFO);
+		/* ... and the packet rounded to a doubleword. */
+#ifdef  __powerpc__
+		outsl_unswapped(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
+#else
+		outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
+#endif
+
+		dev->trans_start = jiffies;
+		if (inw(ioaddr + TX_FREE) > 1536) {
+			dev->tbusy = 0;
+		} else
+			/* Interrupt us when the FIFO has room for max-sized packet. */
+			outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);
+	}
+
+	dev_kfree_skb (skb, FREE_WRITE);
+
+	/* Clear the Tx status stack. */
+	{
+		short tx_status;
+		int i = 4;
+
+		while (--i > 0	&&	(tx_status = inb(ioaddr + TX_STATUS)) > 0) {
+			if (tx_status & 0x38) lp->stats.tx_aborted_errors++;
+			if (tx_status & 0x30) outw(TxReset, ioaddr + EL3_CMD);
+			if (tx_status & 0x3C) outw(TxEnable, ioaddr + EL3_CMD);
+			outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
+		}
+	}
+	return 0;
+}
+
+/* The EL3 interrupt handler. */
+static void
+el3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *)dev_id;
+	int ioaddr, status;
+	int i = max_interrupt_work;
+
+	if (dev == NULL) {
+		printk ("el3_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;
+	status = inw(ioaddr + EL3_STATUS);
+
+	if (el3_debug > 4)
+		printk("%s: interrupt, status %4.4x.\n", dev->name, status);
+
+	while ((status = inw(ioaddr + EL3_STATUS)) &
+		   (IntLatch | RxComplete | StatsFull)) {
+
+		if (status & RxComplete)
+			el3_rx(dev);
+
+		if (status & TxAvailable) {
+			if (el3_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);
+		}
+		if (status & (AdapterFailure | RxEarly | StatsFull | TxComplete)) {
+			/* Handle all uncommon interrupts. */
+			if (status & StatsFull)				/* Empty statistics. */
+				update_stats(ioaddr, dev);
+			if (status & RxEarly) {				/* Rx early is unused. */
+				el3_rx(dev);
+				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
+			}
+			if (status & TxComplete) {			/* Really Tx error. */
+				struct el3_private *lp = (struct el3_private *)dev->priv;
+				short tx_status;
+				int i = 4;
+
+				while (--i>0 && (tx_status = inb(ioaddr + TX_STATUS)) > 0) {
+					if (tx_status & 0x38) lp->stats.tx_aborted_errors++;
+					if (tx_status & 0x30) outw(TxReset, ioaddr + EL3_CMD);
+					if (tx_status & 0x3C) outw(TxEnable, ioaddr + EL3_CMD);
+					outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
+				}
+			}
+			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 < 0) {
+			printk("%s: Infinite loop in interrupt, status %4.4x.\n",
+				   dev->name, status);
+			/* Clear all interrupts. */
+			outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
+			break;
+		}
+		/* Acknowledge the IRQ. */
+		outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD); /* Ack IRQ */
+	}
+
+	if (el3_debug > 4) {
+		printk("%s: exiting interrupt, status %4.4x.\n", dev->name,
+			   inw(ioaddr + EL3_STATUS));
+	}
+
+	dev->interrupt = 0;
+	return;
+}
+
+
+static struct enet_statistics *
+el3_get_stats(struct device *dev)
+{
+	struct el3_private *lp = (struct el3_private *)dev->priv;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	update_stats(dev->base_addr, dev);
+	restore_flags(flags);
+	return &lp->stats;
+}
+
+/*  Update statistics.  We change to register window 6, so this should be run
+	single-threaded if the device is active. This is expected to be a rare
+	operation, and it's simpler for the rest of the driver to assume that
+	window 1 is always valid rather than use a special window-state variable.
+	*/
+static void update_stats(int ioaddr, struct device *dev)
+{
+	struct el3_private *lp = (struct el3_private *)dev->priv;
+
+	if (el3_debug > 5)
+		printk("   Updating the statistics.\n");
+	/* Turn off statistics updates while reading. */
+	outw(StatsDisable, ioaddr + EL3_CMD);
+	/* Switch to the stats window, and read everything. */
+	EL3WINDOW(6);
+	lp->stats.tx_carrier_errors 	+= inb(ioaddr + 0);
+	lp->stats.tx_heartbeat_errors	+= inb(ioaddr + 1);
+	/* Multiple collisions. */	   	inb(ioaddr + 2);
+	lp->stats.collisions			+= inb(ioaddr + 3);
+	lp->stats.tx_window_errors		+= inb(ioaddr + 4);
+	lp->stats.rx_fifo_errors		+= inb(ioaddr + 5);
+	lp->stats.tx_packets			+= inb(ioaddr + 6);
+	/* Rx packets	*/				inb(ioaddr + 7);
+	/* Tx deferrals */				inb(ioaddr + 8);
+	inw(ioaddr + 10);	/* Total Rx and Tx octets. */
+	inw(ioaddr + 12);
+
+	/* Back to window 1, and turn statistics back on. */
+	EL3WINDOW(1);
+	outw(StatsEnable, ioaddr + EL3_CMD);
+	return;
+}
+
+static int
+el3_rx(struct device *dev)
+{
+	struct el3_private *lp = (struct el3_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+	short rx_status;
+
+	if (el3_debug > 5)
+		printk("   In rx_packet(), status %4.4x, rx_status %4.4x.\n",
+			   inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS));
+	while ((rx_status = inw(ioaddr + RX_STATUS)) > 0) {
+		if (rx_status & 0x4000) { /* Error, update stats. */
+			short error = rx_status & 0x3800;
+
+			outw(RxDiscard, ioaddr + EL3_CMD);
+			lp->stats.rx_errors++;
+			switch (error) {
+			case 0x0000:		lp->stats.rx_over_errors++; break;
+			case 0x0800:		lp->stats.rx_length_errors++; break;
+			case 0x1000:		lp->stats.rx_frame_errors++; break;
+			case 0x1800:		lp->stats.rx_length_errors++; break;
+			case 0x2000:		lp->stats.rx_frame_errors++; break;
+			case 0x2800:		lp->stats.rx_crc_errors++; break;
+			}
+		} else {
+			short pkt_len = rx_status & 0x7ff;
+			struct sk_buff *skb;
+
+			skb = dev_alloc_skb(pkt_len+5);
+			if (el3_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 */
+
+				/* 'skb->data' points to the start of sk_buff data area. */
+#ifdef  __powerpc__
+				insl_unswapped(ioaddr+RX_FIFO, skb_put(skb,pkt_len),
+							   (pkt_len + 3) >> 2);
+#else
+				insl(ioaddr + RX_FIFO, skb_put(skb,pkt_len),
+					 (pkt_len + 3) >> 2);
+#endif
+
+				outw(RxDiscard, ioaddr + EL3_CMD); /* Pop top Rx packet. */
+				skb->protocol = eth_type_trans(skb,dev);
+				netif_rx(skb);
+				lp->stats.rx_packets++;
+				continue;
+			}
+			outw(RxDiscard, ioaddr + EL3_CMD);
+			lp->stats.rx_dropped++;
+			if (el3_debug)
+				printk("%s: Couldn't allocate a sk_buff of size %d.\n",
+					   dev->name, pkt_len);
+		}
+		inw(ioaddr + EL3_STATUS); 				/* Delay. */
+		while (inw(ioaddr + EL3_STATUS) & 0x1000)
+			printk("	Waiting for 3c509 to discard packet, status %x.\n",
+				   inw(ioaddr + EL3_STATUS) );
+	}
+
+	return 0;
+}
+
+/*
+ *     Set or clear the multicast filter for this adaptor.
+ */
+static void
+set_multicast_list(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+	if (el3_debug > 1) {
+		static int old = 0;
+		if (old != dev->mc_count) {
+			old = dev->mc_count;
+			printk("%s: Setting Rx mode to %d addresses.\n", dev->name, dev->mc_count);
+		}
+	}
+	if (dev->flags&IFF_PROMISC) {
+		outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
+			 ioaddr + EL3_CMD);
+	}
+	else if (dev->mc_count || (dev->flags&IFF_ALLMULTI)) {
+		outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast, ioaddr + EL3_CMD);
+	}
+	else
+                outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
+}
+
+static int
+el3_close(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+
+	if (el3_debug > 2)
+		printk("%s: Shutting down ethercard.\n", dev->name);
+
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	/* 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, dev);
+	/* Switching back to window 0 disables the IRQ. */
+	EL3WINDOW(0);
+	/* But we explicitly zero the IRQ line select anyway. */
+	outw(0x0f00, ioaddr + WN0_IRQ);
+
+	update_stats(ioaddr, dev);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+#ifdef MODULE
+/* Parameters that may be passed into the module. */
+static int debug = -1;
+static int irq[] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int xcvr[] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+int
+init_module(void)
+{
+	int el3_cards = 0;
+
+	if (debug >= 0)
+		el3_debug = debug;
+
+	el3_root_dev = NULL;
+	while (el3_probe(0) == 0) {
+		if (irq[el3_cards] > 1)
+			el3_root_dev->irq = irq[el3_cards];
+		if (xcvr[el3_cards] >= 0)
+			el3_root_dev->if_port = xcvr[el3_cards];
+		el3_cards++;
+	}
+
+	return el3_cards ? 0 : -ENODEV;
+}
+
+void
+cleanup_module(void)
+{
+	struct device *next_dev;
+
+	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
+	while (el3_root_dev) {
+		next_dev = ((struct el3_private *)el3_root_dev->priv)->next_dev;
+		unregister_netdev(el3_root_dev);
+		release_region(el3_root_dev->base_addr, EL3_IO_EXTENT);
+		kfree(el3_root_dev);
+		el3_root_dev = next_dev;
+	}
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c 3c509.c"
+ *  version-control: t
+ *  kept-new-versions: 5
+ *  tab-width: 4
+ * End:
+ */