Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 1165 insertions, 0 deletions

diff --git a/drivers/net/ethernet/3com/3c574_cs.c b/drivers/net/ethernet/3com/3c574_cs.c
new file mode 100644
index 000000000..3044a6f35
--- /dev/null
+++ b/drivers/net/ethernet/3com/3c574_cs.c
@@ -0,0 +1,1165 @@
+/* 3c574.c: A PCMCIA ethernet driver for the 3com 3c574 "RoadRunner".
+
+	Written 1993-1998 by
+	Donald Becker, becker@scyld.com, (driver core) and
+	David Hinds, dahinds@users.sourceforge.net (from his PC card code).
+	Locking fixes (C) Copyright 2003 Red Hat Inc
+
+	This software may be used and distributed according to the terms of
+	the GNU General Public License, incorporated herein by reference.
+
+	This driver derives from Donald Becker's 3c509 core, which has the
+	following copyright:
+	Copyright 1993 United States Government as represented by the
+	Director, National Security Agency.
+	
+
+*/
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the 3Com 3c574 PC card Fast Ethernet
+Adapter.
+
+II. Board-specific settings
+
+None -- PC cards are autoconfigured.
+
+III. Driver operation
+
+The 3c574 uses a Boomerang-style interface, without the bus-master capability.
+See the Boomerang driver and documentation for most details.
+
+IV. Notes and chip documentation.
+
+Two added registers are used to enhance PIO performance, RunnerRdCtrl and
+RunnerWrCtrl.  These are 11 bit down-counters that are preloaded with the
+count of word (16 bits) reads or writes the driver is about to do to the Rx
+or Tx FIFO.  The chip is then able to hide the internal-PCI-bus to PC-card
+translation latency by buffering the I/O operations with an 8 word FIFO.
+Note: No other chip accesses are permitted when this buffer is used.
+
+A second enhancement is that both attribute and common memory space
+0x0800-0x0fff can translated to the PIO FIFO.  Thus memory operations (faster
+with *some* PCcard bridges) may be used instead of I/O operations.
+This is enabled by setting the 0x10 bit in the PCMCIA LAN COR.
+
+Some slow PC card bridges work better if they never see a WAIT signal.
+This is configured by setting the 0x20 bit in the PCMCIA LAN COR.
+Only do this after testing that it is reliable and improves performance.
+
+The upper five bits of RunnerRdCtrl are used to window into PCcard
+configuration space registers.  Window 0 is the regular Boomerang/Odie
+register set, 1-5 are various PC card control registers, and 16-31 are
+the (reversed!) CIS table.
+
+A final note: writing the InternalConfig register in window 3 with an
+invalid ramWidth is Very Bad.
+
+V. References
+
+http://www.scyld.com/expert/NWay.html
+http://www.national.com/opf/DP/DP83840A.html
+
+Thanks to Terry Murphy of 3Com for providing development information for
+earlier 3Com products.
+
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/ioport.h>
+#include <linux/bitops.h>
+#include <linux/mii.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/cisreg.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+
+#include <linux/uaccess.h>
+#include <asm/io.h>
+
+/*====================================================================*/
+
+/* Module parameters */
+
+MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
+MODULE_DESCRIPTION("3Com 3c574 series PCMCIA ethernet driver");
+MODULE_LICENSE("GPL");
+
+#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0)
+
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+INT_MODULE_PARM(max_interrupt_work, 32);
+
+/* Force full duplex modes? */
+INT_MODULE_PARM(full_duplex, 0);
+
+/* Autodetect link polarity reversal? */
+INT_MODULE_PARM(auto_polarity, 1);
+
+
+/*====================================================================*/
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  ((800*HZ)/1000)
+
+/* To minimize the size of the driver source and make the driver more
+   readable not all constants are symbolically defined.
+   You'll need the manual if you want to understand driver details anyway. */
+/* Offsets from base I/O address. */
+#define EL3_DATA	0x00
+#define EL3_CMD		0x0e
+#define EL3_STATUS	0x0e
+
+#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 el3_cmds {
+	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 elxl_status {
+	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
+};
+
+enum Window0 {
+	Wn0EepromCmd = 10, Wn0EepromData = 12, /* EEPROM command/address, data. */
+	IntrStatus=0x0E,		/* Valid in all windows. */
+};
+/* These assumes the larger EEPROM. */
+enum Win0_EEPROM_cmds {
+	EEPROM_Read = 0x200, EEPROM_WRITE = 0x100, EEPROM_ERASE = 0x300,
+	EEPROM_EWENB = 0x30,		/* Enable erasing/writing for 10 msec. */
+	EEPROM_EWDIS = 0x00,		/* Disable EWENB before 10 msec timeout. */
+};
+
+/* Register window 1 offsets, the window used in normal operation.
+   On the "Odie" this window is always mapped at offsets 0x10-0x1f.
+   Except for TxFree, which is overlapped by RunnerWrCtrl. */
+enum Window1 {
+	TX_FIFO = 0x10,  RX_FIFO = 0x10,  RxErrors = 0x14,
+	RxStatus = 0x18,  Timer=0x1A, TxStatus = 0x1B,
+	TxFree = 0x0C, /* Remaining free bytes in Tx buffer. */
+	RunnerRdCtrl = 0x16, RunnerWrCtrl = 0x1c,
+};
+
+enum Window3 {			/* Window 3: MAC/config bits. */
+	Wn3_Config=0, Wn3_MAC_Ctrl=6, Wn3_Options=8,
+};
+enum wn3_config {
+	Ram_size = 7,
+	Ram_width = 8,
+	Ram_speed = 0x30,
+	Rom_size = 0xc0,
+	Ram_split_shift = 16,
+	Ram_split = 3 << Ram_split_shift,
+	Xcvr_shift = 20,
+	Xcvr = 7 << Xcvr_shift,
+	Autoselect = 0x1000000,
+};
+
+enum Window4 {		/* Window 4: Xcvr/media bits. */
+	Wn4_FIFODiag = 4, Wn4_NetDiag = 6, Wn4_PhysicalMgmt=8, Wn4_Media = 10,
+};
+
+#define MEDIA_TP	0x00C0	/* Enable link beat and jabber for 10baseT. */
+
+struct el3_private {
+	struct pcmcia_device	*p_dev;
+	u16 advertising, partner;		/* NWay media advertisement */
+	unsigned char phys;			/* MII device address */
+	unsigned int autoselect:1, default_media:3;	/* Read from the EEPROM/Wn3_Config. */
+	/* for transceiver monitoring */
+	struct timer_list media;
+	unsigned short media_status;
+	unsigned short fast_poll;
+	unsigned long last_irq;
+	spinlock_t window_lock;			/* Guards the Window selection */
+};
+
+/* Set iff a MII transceiver on any interface requires mdio preamble.
+   This only set with the original DP83840 on older 3c905 boards, so the extra
+   code size of a per-interface flag is not worthwhile. */
+static char mii_preamble_required = 0;
+
+/* Index of functions. */
+
+static int tc574_config(struct pcmcia_device *link);
+static void tc574_release(struct pcmcia_device *link);
+
+static void mdio_sync(unsigned int ioaddr, int bits);
+static int mdio_read(unsigned int ioaddr, int phy_id, int location);
+static void mdio_write(unsigned int ioaddr, int phy_id, int location,
+		       int value);
+static unsigned short read_eeprom(unsigned int ioaddr, int index);
+static void tc574_wait_for_completion(struct net_device *dev, int cmd);
+
+static void tc574_reset(struct net_device *dev);
+static void media_check(struct timer_list *t);
+static int el3_open(struct net_device *dev);
+static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
+					struct net_device *dev);
+static irqreturn_t el3_interrupt(int irq, void *dev_id);
+static void update_stats(struct net_device *dev);
+static struct net_device_stats *el3_get_stats(struct net_device *dev);
+static int el3_rx(struct net_device *dev, int worklimit);
+static int el3_close(struct net_device *dev);
+static void el3_tx_timeout(struct net_device *dev);
+static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static void set_rx_mode(struct net_device *dev);
+static void set_multicast_list(struct net_device *dev);
+
+static void tc574_detach(struct pcmcia_device *p_dev);
+
+/*
+	tc574_attach() creates an "instance" of the driver, allocating
+	local data structures for one device.  The device is registered
+	with Card Services.
+*/
+static const struct net_device_ops el3_netdev_ops = {
+	.ndo_open 		= el3_open,
+	.ndo_stop 		= el3_close,
+	.ndo_start_xmit		= el3_start_xmit,
+	.ndo_tx_timeout 	= el3_tx_timeout,
+	.ndo_get_stats		= el3_get_stats,
+	.ndo_do_ioctl		= el3_ioctl,
+	.ndo_set_rx_mode	= set_multicast_list,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int tc574_probe(struct pcmcia_device *link)
+{
+	struct el3_private *lp;
+	struct net_device *dev;
+
+	dev_dbg(&link->dev, "3c574_attach()\n");
+
+	/* Create the PC card device object. */
+	dev = alloc_etherdev(sizeof(struct el3_private));
+	if (!dev)
+		return -ENOMEM;
+	lp = netdev_priv(dev);
+	link->priv = dev;
+	lp->p_dev = link;
+
+	spin_lock_init(&lp->window_lock);
+	link->resource[0]->end = 32;
+	link->resource[0]->flags |= IO_DATA_PATH_WIDTH_16;
+	link->config_flags |= CONF_ENABLE_IRQ;
+	link->config_index = 1;
+
+	dev->netdev_ops = &el3_netdev_ops;
+	dev->watchdog_timeo = TX_TIMEOUT;
+
+	return tc574_config(link);
+}
+
+static void tc574_detach(struct pcmcia_device *link)
+{
+	struct net_device *dev = link->priv;
+
+	dev_dbg(&link->dev, "3c574_detach()\n");
+
+	unregister_netdev(dev);
+
+	tc574_release(link);
+
+	free_netdev(dev);
+} /* tc574_detach */
+
+static const char *ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
+
+static int tc574_config(struct pcmcia_device *link)
+{
+	struct net_device *dev = link->priv;
+	struct el3_private *lp = netdev_priv(dev);
+	int ret, i, j;
+	unsigned int ioaddr;
+	__be16 *phys_addr;
+	char *cardname;
+	__u32 config;
+	u8 *buf;
+	size_t len;
+
+	phys_addr = (__be16 *)dev->dev_addr;
+
+	dev_dbg(&link->dev, "3c574_config()\n");
+
+	link->io_lines = 16;
+
+	for (i = j = 0; j < 0x400; j += 0x20) {
+		link->resource[0]->start = j ^ 0x300;
+		i = pcmcia_request_io(link);
+		if (i == 0)
+			break;
+	}
+	if (i != 0)
+		goto failed;
+
+	ret = pcmcia_request_irq(link, el3_interrupt);
+	if (ret)
+		goto failed;
+
+	ret = pcmcia_enable_device(link);
+	if (ret)
+		goto failed;
+
+	dev->irq = link->irq;
+	dev->base_addr = link->resource[0]->start;
+
+	ioaddr = dev->base_addr;
+
+	/* The 3c574 normally uses an EEPROM for configuration info, including
+	   the hardware address.  The future products may include a modem chip
+	   and put the address in the CIS. */
+
+	len = pcmcia_get_tuple(link, 0x88, &buf);
+	if (buf && len >= 6) {
+		for (i = 0; i < 3; i++)
+			phys_addr[i] = htons(le16_to_cpu(buf[i * 2]));
+		kfree(buf);
+	} else {
+		kfree(buf); /* 0 < len < 6 */
+		EL3WINDOW(0);
+		for (i = 0; i < 3; i++)
+			phys_addr[i] = htons(read_eeprom(ioaddr, i + 10));
+		if (phys_addr[0] == htons(0x6060)) {
+			pr_notice("IO port conflict at 0x%03lx-0x%03lx\n",
+				  dev->base_addr, dev->base_addr+15);
+			goto failed;
+		}
+	}
+	if (link->prod_id[1])
+		cardname = link->prod_id[1];
+	else
+		cardname = "3Com 3c574";
+
+	{
+		u_char mcr;
+		outw(2<<11, ioaddr + RunnerRdCtrl);
+		mcr = inb(ioaddr + 2);
+		outw(0<<11, ioaddr + RunnerRdCtrl);
+		pr_info("  ASIC rev %d,", mcr>>3);
+		EL3WINDOW(3);
+		config = inl(ioaddr + Wn3_Config);
+		lp->default_media = (config & Xcvr) >> Xcvr_shift;
+		lp->autoselect = config & Autoselect ? 1 : 0;
+	}
+
+	timer_setup(&lp->media, media_check, 0);
+
+	{
+		int phy;
+		
+		/* Roadrunner only: Turn on the MII transceiver */
+		outw(0x8040, ioaddr + Wn3_Options);
+		mdelay(1);
+		outw(0xc040, ioaddr + Wn3_Options);
+		tc574_wait_for_completion(dev, TxReset);
+		tc574_wait_for_completion(dev, RxReset);
+		mdelay(1);
+		outw(0x8040, ioaddr + Wn3_Options);
+		
+		EL3WINDOW(4);
+		for (phy = 1; phy <= 32; phy++) {
+			int mii_status;
+			mdio_sync(ioaddr, 32);
+			mii_status = mdio_read(ioaddr, phy & 0x1f, 1);
+			if (mii_status != 0xffff) {
+				lp->phys = phy & 0x1f;
+				dev_dbg(&link->dev, "  MII transceiver at "
+					"index %d, status %x.\n",
+					  phy, mii_status);
+				if ((mii_status & 0x0040) == 0)
+					mii_preamble_required = 1;
+				break;
+			}
+		}
+		if (phy > 32) {
+			pr_notice("  No MII transceivers found!\n");
+			goto failed;
+		}
+		i = mdio_read(ioaddr, lp->phys, 16) | 0x40;
+		mdio_write(ioaddr, lp->phys, 16, i);
+		lp->advertising = mdio_read(ioaddr, lp->phys, 4);
+		if (full_duplex) {
+			/* Only advertise the FD media types. */
+			lp->advertising &= ~0x02a0;
+			mdio_write(ioaddr, lp->phys, 4, lp->advertising);
+		}
+	}
+
+	SET_NETDEV_DEV(dev, &link->dev);
+
+	if (register_netdev(dev) != 0) {
+		pr_notice("register_netdev() failed\n");
+		goto failed;
+	}
+
+	netdev_info(dev, "%s at io %#3lx, irq %d, hw_addr %pM\n",
+		    cardname, dev->base_addr, dev->irq, dev->dev_addr);
+	netdev_info(dev, " %dK FIFO split %s Rx:Tx, %sMII interface.\n",
+		    8 << (config & Ram_size),
+		    ram_split[(config & Ram_split) >> Ram_split_shift],
+		    config & Autoselect ? "autoselect " : "");
+
+	return 0;
+
+failed:
+	tc574_release(link);
+	return -ENODEV;
+
+} /* tc574_config */
+
+static void tc574_release(struct pcmcia_device *link)
+{
+	pcmcia_disable_device(link);
+}
+
+static int tc574_suspend(struct pcmcia_device *link)
+{
+	struct net_device *dev = link->priv;
+
+	if (link->open)
+		netif_device_detach(dev);
+
+	return 0;
+}
+
+static int tc574_resume(struct pcmcia_device *link)
+{
+	struct net_device *dev = link->priv;
+
+	if (link->open) {
+		tc574_reset(dev);
+		netif_device_attach(dev);
+	}
+
+	return 0;
+}
+
+static void dump_status(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	EL3WINDOW(1);
+	netdev_info(dev, "  irq status %04x, rx status %04x, tx status %02x, tx free %04x\n",
+		    inw(ioaddr+EL3_STATUS),
+		    inw(ioaddr+RxStatus), inb(ioaddr+TxStatus),
+		    inw(ioaddr+TxFree));
+	EL3WINDOW(4);
+	netdev_info(dev, "  diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
+		    inw(ioaddr+0x04), inw(ioaddr+0x06),
+		    inw(ioaddr+0x08), inw(ioaddr+0x0a));
+	EL3WINDOW(1);
+}
+
+/*
+  Use this for commands that may take time to finish
+*/
+static void tc574_wait_for_completion(struct net_device *dev, int cmd)
+{
+	int i = 1500;
+	outw(cmd, dev->base_addr + EL3_CMD);
+	while (--i > 0)
+		if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000)) break;
+	if (i == 0)
+		netdev_notice(dev, "command 0x%04x did not complete!\n", cmd);
+}
+
+/* Read a word from the EEPROM using the regular EEPROM access register.
+   Assume that we are in register window zero.
+ */
+static unsigned short read_eeprom(unsigned int ioaddr, int index)
+{
+	int timer;
+	outw(EEPROM_Read + index, ioaddr + Wn0EepromCmd);
+	/* Pause for at least 162 usec for the read to take place. */
+	for (timer = 1620; timer >= 0; timer--) {
+		if ((inw(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
+			break;
+	}
+	return inw(ioaddr + Wn0EepromData);
+}
+
+/* MII transceiver control section.
+   Read and write the MII registers using software-generated serial
+   MDIO protocol.  See the MII specifications or DP83840A data sheet
+   for details.
+   The maxium data clock rate is 2.5 Mhz.  The timing is easily met by the
+   slow PC card interface. */
+
+#define MDIO_SHIFT_CLK	0x01
+#define MDIO_DIR_WRITE	0x04
+#define MDIO_DATA_WRITE0 (0x00 | MDIO_DIR_WRITE)
+#define MDIO_DATA_WRITE1 (0x02 | MDIO_DIR_WRITE)
+#define MDIO_DATA_READ	0x02
+#define MDIO_ENB_IN		0x00
+
+/* Generate the preamble required for initial synchronization and
+   a few older transceivers. */
+static void mdio_sync(unsigned int ioaddr, int bits)
+{
+	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
+
+	/* Establish sync by sending at least 32 logic ones. */
+	while (-- bits >= 0) {
+		outw(MDIO_DATA_WRITE1, mdio_addr);
+		outw(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
+	}
+}
+
+static int mdio_read(unsigned int ioaddr, int phy_id, int location)
+{
+	int i;
+	int read_cmd = (0xf6 << 10) | (phy_id << 5) | location;
+	unsigned int retval = 0;
+	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
+
+	if (mii_preamble_required)
+		mdio_sync(ioaddr, 32);
+
+	/* Shift the read command bits out. */
+	for (i = 14; i >= 0; i--) {
+		int dataval = (read_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
+		outw(dataval, mdio_addr);
+		outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
+	}
+	/* Read the two transition, 16 data, and wire-idle bits. */
+	for (i = 19; i > 0; i--) {
+		outw(MDIO_ENB_IN, mdio_addr);
+		retval = (retval << 1) | ((inw(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
+		outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
+	}
+	return (retval>>1) & 0xffff;
+}
+
+static void mdio_write(unsigned int ioaddr, int phy_id, int location, int value)
+{
+	int write_cmd = 0x50020000 | (phy_id << 23) | (location << 18) | value;
+	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
+	int i;
+
+	if (mii_preamble_required)
+		mdio_sync(ioaddr, 32);
+
+	/* Shift the command bits out. */
+	for (i = 31; i >= 0; i--) {
+		int dataval = (write_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
+		outw(dataval, mdio_addr);
+		outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
+	}
+	/* Leave the interface idle. */
+	for (i = 1; i >= 0; i--) {
+		outw(MDIO_ENB_IN, mdio_addr);
+		outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
+	}
+}
+
+/* Reset and restore all of the 3c574 registers. */
+static void tc574_reset(struct net_device *dev)
+{
+	struct el3_private *lp = netdev_priv(dev);
+	int i;
+	unsigned int ioaddr = dev->base_addr;
+	unsigned long flags;
+
+	tc574_wait_for_completion(dev, TotalReset|0x10);
+
+	spin_lock_irqsave(&lp->window_lock, flags);
+	/* Clear any transactions in progress. */
+	outw(0, ioaddr + RunnerWrCtrl);
+	outw(0, ioaddr + RunnerRdCtrl);
+
+	/* Set the station address and mask. */
+	EL3WINDOW(2);
+	for (i = 0; i < 6; i++)
+		outb(dev->dev_addr[i], ioaddr + i);
+	for (; i < 12; i+=2)
+		outw(0, ioaddr + i);
+
+	/* Reset config options */
+	EL3WINDOW(3);
+	outb((dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
+	outl((lp->autoselect ? 0x01000000 : 0) | 0x0062001b,
+		 ioaddr + Wn3_Config);
+	/* Roadrunner only: Turn on the MII transceiver. */
+	outw(0x8040, ioaddr + Wn3_Options);
+	mdelay(1);
+	outw(0xc040, ioaddr + Wn3_Options);
+	EL3WINDOW(1);
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+	
+	tc574_wait_for_completion(dev, TxReset);
+	tc574_wait_for_completion(dev, RxReset);
+	mdelay(1);
+	spin_lock_irqsave(&lp->window_lock, flags);
+	EL3WINDOW(3);
+	outw(0x8040, ioaddr + Wn3_Options);
+
+	/* 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);
+	EL3WINDOW(4);
+	inb(ioaddr + 12);
+	inb(ioaddr + 13);
+
+	/* .. enable any extra statistics bits.. */
+	outw(0x0040, ioaddr + Wn4_NetDiag);
+	
+	EL3WINDOW(1);
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+	
+	/* .. re-sync MII and re-fill what NWay is advertising. */
+	mdio_sync(ioaddr, 32);
+	mdio_write(ioaddr, lp->phys, 4, lp->advertising);
+	if (!auto_polarity) {
+		/* works for TDK 78Q2120 series MII's */
+		i = mdio_read(ioaddr, lp->phys, 16) | 0x20;
+		mdio_write(ioaddr, lp->phys, 16, i);
+	}
+
+	spin_lock_irqsave(&lp->window_lock, flags);
+	/* Switch to register set 1 for normal use, just for TxFree. */
+	set_rx_mode(dev);
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+	outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
+	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
+		 | AdapterFailure | RxEarly, ioaddr + EL3_CMD);
+}
+
+static int el3_open(struct net_device *dev)
+{
+	struct el3_private *lp = netdev_priv(dev);
+	struct pcmcia_device *link = lp->p_dev;
+
+	if (!pcmcia_dev_present(link))
+		return -ENODEV;
+	
+	link->open++;
+	netif_start_queue(dev);
+	
+	tc574_reset(dev);
+	lp->media.expires = jiffies + HZ;
+	add_timer(&lp->media);
+	
+	dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
+		  dev->name, inw(dev->base_addr + EL3_STATUS));
+	
+	return 0;
+}
+
+static void el3_tx_timeout(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	
+	netdev_notice(dev, "Transmit timed out!\n");
+	dump_status(dev);
+	dev->stats.tx_errors++;
+	netif_trans_update(dev); /* prevent tx timeout */
+	/* Issue TX_RESET and TX_START commands. */
+	tc574_wait_for_completion(dev, TxReset);
+	outw(TxEnable, ioaddr + EL3_CMD);
+	netif_wake_queue(dev);
+}
+
+static void pop_tx_status(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	int i;
+    
+	/* Clear the Tx status stack. */
+	for (i = 32; i > 0; i--) {
+		u_char tx_status = inb(ioaddr + TxStatus);
+		if (!(tx_status & 0x84))
+			break;
+		/* reset transmitter on jabber error or underrun */
+		if (tx_status & 0x30)
+			tc574_wait_for_completion(dev, TxReset);
+		if (tx_status & 0x38) {
+			pr_debug("%s: transmit error: status 0x%02x\n",
+				  dev->name, tx_status);
+			outw(TxEnable, ioaddr + EL3_CMD);
+			dev->stats.tx_aborted_errors++;
+		}
+		outb(0x00, ioaddr + TxStatus); /* Pop the status stack. */
+	}
+}
+
+static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
+					struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	struct el3_private *lp = netdev_priv(dev);
+	unsigned long flags;
+
+	pr_debug("%s: el3_start_xmit(length = %ld) called, "
+		  "status %4.4x.\n", dev->name, (long)skb->len,
+		  inw(ioaddr + EL3_STATUS));
+
+	spin_lock_irqsave(&lp->window_lock, flags);
+
+	dev->stats.tx_bytes += skb->len;
+
+	/* Put out the doubleword header... */
+	outw(skb->len, ioaddr + TX_FIFO);
+	outw(0, ioaddr + TX_FIFO);
+	/* ... and the packet rounded to a doubleword. */
+	outsl(ioaddr + TX_FIFO, skb->data, (skb->len+3)>>2);
+
+	/* TxFree appears only in Window 1, not offset 0x1c. */
+	if (inw(ioaddr + TxFree) <= 1536) {
+		netif_stop_queue(dev);
+		/* Interrupt us when the FIFO has room for max-sized packet. 
+		   The threshold is in units of dwords. */
+		outw(SetTxThreshold + (1536>>2), ioaddr + EL3_CMD);
+	}
+
+	pop_tx_status(dev);
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+/* The EL3 interrupt handler. */
+static irqreturn_t el3_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct el3_private *lp = netdev_priv(dev);
+	unsigned int ioaddr;
+	unsigned status;
+	int work_budget = max_interrupt_work;
+	int handled = 0;
+
+	if (!netif_device_present(dev))
+		return IRQ_NONE;
+	ioaddr = dev->base_addr;
+
+	pr_debug("%s: interrupt, status %4.4x.\n",
+		  dev->name, inw(ioaddr + EL3_STATUS));
+
+	spin_lock(&lp->window_lock);
+	
+	while ((status = inw(ioaddr + EL3_STATUS)) &
+		   (IntLatch | RxComplete | RxEarly | StatsFull)) {
+		if (!netif_device_present(dev) ||
+			((status & 0xe000) != 0x2000)) {
+			pr_debug("%s: Interrupt from dead card\n", dev->name);
+			break;
+		}
+
+		handled = 1;
+
+		if (status & RxComplete)
+			work_budget = el3_rx(dev, work_budget);
+
+		if (status & TxAvailable) {
+			pr_debug("  TX room bit was handled.\n");
+			/* There's room in the FIFO for a full-sized packet. */
+			outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
+			netif_wake_queue(dev);
+		}
+
+		if (status & TxComplete)
+			pop_tx_status(dev);
+
+		if (status & (AdapterFailure | RxEarly | StatsFull)) {
+			/* Handle all uncommon interrupts. */
+			if (status & StatsFull)
+				update_stats(dev);
+			if (status & RxEarly) {
+				work_budget = el3_rx(dev, work_budget);
+				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
+			}
+			if (status & AdapterFailure) {
+				u16 fifo_diag;
+				EL3WINDOW(4);
+				fifo_diag = inw(ioaddr + Wn4_FIFODiag);
+				EL3WINDOW(1);
+				netdev_notice(dev, "adapter failure, FIFO diagnostic register %04x\n",
+					      fifo_diag);
+				if (fifo_diag & 0x0400) {
+					/* Tx overrun */
+					tc574_wait_for_completion(dev, TxReset);
+					outw(TxEnable, ioaddr + EL3_CMD);
+				}
+				if (fifo_diag & 0x2000) {
+					/* Rx underrun */
+					tc574_wait_for_completion(dev, RxReset);
+					set_rx_mode(dev);
+					outw(RxEnable, ioaddr + EL3_CMD);
+				}
+				outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
+			}
+		}
+
+		if (--work_budget < 0) {
+			pr_debug("%s: Too much work 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);
+	}
+
+	pr_debug("%s: exiting interrupt, status %4.4x.\n",
+		  dev->name, inw(ioaddr + EL3_STATUS));
+		  
+	spin_unlock(&lp->window_lock);
+	return IRQ_RETVAL(handled);
+}
+
+/*
+    This timer serves two purposes: to check for missed interrupts
+	(and as a last resort, poll the NIC for events), and to monitor
+	the MII, reporting changes in cable status.
+*/
+static void media_check(struct timer_list *t)
+{
+	struct el3_private *lp = from_timer(lp, t, media);
+	struct net_device *dev = lp->p_dev->priv;
+	unsigned int ioaddr = dev->base_addr;
+	unsigned long flags;
+	unsigned short /* cable, */ media, partner;
+
+	if (!netif_device_present(dev))
+		goto reschedule;
+	
+	/* Check for pending interrupt with expired latency timer: with
+	   this, we can limp along even if the interrupt is blocked */
+	if ((inw(ioaddr + EL3_STATUS) & IntLatch) && (inb(ioaddr + Timer) == 0xff)) {
+		if (!lp->fast_poll)
+			netdev_info(dev, "interrupt(s) dropped!\n");
+
+		local_irq_save(flags);
+		el3_interrupt(dev->irq, dev);
+		local_irq_restore(flags);
+
+		lp->fast_poll = HZ;
+	}
+	if (lp->fast_poll) {
+		lp->fast_poll--;
+		lp->media.expires = jiffies + 2*HZ/100;
+		add_timer(&lp->media);
+		return;
+	}
+
+	spin_lock_irqsave(&lp->window_lock, flags);
+	EL3WINDOW(4);
+	media = mdio_read(ioaddr, lp->phys, 1);
+	partner = mdio_read(ioaddr, lp->phys, 5);
+	EL3WINDOW(1);
+	
+	if (media != lp->media_status) {
+		if ((media ^ lp->media_status) & 0x0004)
+			netdev_info(dev, "%s link beat\n",
+				    (lp->media_status & 0x0004) ? "lost" : "found");
+		if ((media ^ lp->media_status) & 0x0020) {
+			lp->partner = 0;
+			if (lp->media_status & 0x0020) {
+				netdev_info(dev, "autonegotiation restarted\n");
+			} else if (partner) {
+				partner &= lp->advertising;
+				lp->partner = partner;
+				netdev_info(dev, "autonegotiation complete: "
+					    "%dbaseT-%cD selected\n",
+					    (partner & 0x0180) ? 100 : 10,
+					    (partner & 0x0140) ? 'F' : 'H');
+			} else {
+				netdev_info(dev, "link partner did not autonegotiate\n");
+			}
+
+			EL3WINDOW(3);
+			outb((partner & 0x0140 ? 0x20 : 0) |
+				 (dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
+			EL3WINDOW(1);
+
+		}
+		if (media & 0x0010)
+			netdev_info(dev, "remote fault detected\n");
+		if (media & 0x0002)
+			netdev_info(dev, "jabber detected\n");
+		lp->media_status = media;
+	}
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+
+reschedule:
+	lp->media.expires = jiffies + HZ;
+	add_timer(&lp->media);
+}
+
+static struct net_device_stats *el3_get_stats(struct net_device *dev)
+{
+	struct el3_private *lp = netdev_priv(dev);
+
+	if (netif_device_present(dev)) {
+		unsigned long flags;
+		spin_lock_irqsave(&lp->window_lock, flags);
+		update_stats(dev);
+		spin_unlock_irqrestore(&lp->window_lock, flags);
+	}
+	return &dev->stats;
+}
+
+/*  Update statistics.
+	Surprisingly this need not be run single-threaded, but it effectively is.
+	The counters clear when read, so the adds must merely be atomic.
+ */
+static void update_stats(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	u8 rx, tx, up;
+
+	pr_debug("%s: updating the statistics.\n", dev->name);
+
+	if (inw(ioaddr+EL3_STATUS) == 0xffff) /* No card. */
+		return;
+		
+	/* Unlike the 3c509 we need not turn off stats updates while reading. */
+	/* Switch to the stats window, and read everything. */
+	EL3WINDOW(6);
+	dev->stats.tx_carrier_errors 		+= inb(ioaddr + 0);
+	dev->stats.tx_heartbeat_errors		+= inb(ioaddr + 1);
+	/* Multiple collisions. */	   	inb(ioaddr + 2);
+	dev->stats.collisions			+= inb(ioaddr + 3);
+	dev->stats.tx_window_errors		+= inb(ioaddr + 4);
+	dev->stats.rx_fifo_errors		+= inb(ioaddr + 5);
+	dev->stats.tx_packets			+= inb(ioaddr + 6);
+	up		 			 = inb(ioaddr + 9);
+	dev->stats.tx_packets			+= (up&0x30) << 4;
+	/* Rx packets   */			   inb(ioaddr + 7);
+	/* Tx deferrals */			   inb(ioaddr + 8);
+	rx		 			 = inw(ioaddr + 10);
+	tx					 = inw(ioaddr + 12);
+
+	EL3WINDOW(4);
+	/* BadSSD */				   inb(ioaddr + 12);
+	up					 = inb(ioaddr + 13);
+
+	EL3WINDOW(1);
+}
+
+static int el3_rx(struct net_device *dev, int worklimit)
+{
+	unsigned int ioaddr = dev->base_addr;
+	short rx_status;
+	
+	pr_debug("%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
+		  dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
+	while (!((rx_status = inw(ioaddr + RxStatus)) & 0x8000) &&
+			worklimit > 0) {
+		worklimit--;
+		if (rx_status & 0x4000) { /* Error, update stats. */
+			short error = rx_status & 0x3800;
+			dev->stats.rx_errors++;
+			switch (error) {
+			case 0x0000:	dev->stats.rx_over_errors++; break;
+			case 0x0800:	dev->stats.rx_length_errors++; break;
+			case 0x1000:	dev->stats.rx_frame_errors++; break;
+			case 0x1800:	dev->stats.rx_length_errors++; break;
+			case 0x2000:	dev->stats.rx_frame_errors++; break;
+			case 0x2800:	dev->stats.rx_crc_errors++; break;
+			}
+		} else {
+			short pkt_len = rx_status & 0x7ff;
+			struct sk_buff *skb;
+
+			skb = netdev_alloc_skb(dev, pkt_len + 5);
+
+			pr_debug("  Receiving packet size %d status %4.4x.\n",
+				  pkt_len, rx_status);
+			if (skb != NULL) {
+				skb_reserve(skb, 2);
+				insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
+						((pkt_len+3)>>2));
+				skb->protocol = eth_type_trans(skb, dev);
+				netif_rx(skb);
+				dev->stats.rx_packets++;
+				dev->stats.rx_bytes += pkt_len;
+			} else {
+				pr_debug("%s: couldn't allocate a sk_buff of"
+					  " size %d.\n", dev->name, pkt_len);
+				dev->stats.rx_dropped++;
+			}
+		}
+		tc574_wait_for_completion(dev, RxDiscard);
+	}
+
+	return worklimit;
+}
+
+/* Provide ioctl() calls to examine the MII xcvr state. */
+static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct el3_private *lp = netdev_priv(dev);
+	unsigned int ioaddr = dev->base_addr;
+	struct mii_ioctl_data *data = if_mii(rq);
+	int phy = lp->phys & 0x1f;
+
+	pr_debug("%s: In ioct(%-.6s, %#4.4x) %4.4x %4.4x %4.4x %4.4x.\n",
+		  dev->name, rq->ifr_ifrn.ifrn_name, cmd,
+		  data->phy_id, data->reg_num, data->val_in, data->val_out);
+
+	switch(cmd) {
+	case SIOCGMIIPHY:		/* Get the address of the PHY in use. */
+		data->phy_id = phy;
+		/* fall through */
+	case SIOCGMIIREG:		/* Read the specified MII register. */
+		{
+			int saved_window;
+			unsigned long flags;
+
+			spin_lock_irqsave(&lp->window_lock, flags);
+			saved_window = inw(ioaddr + EL3_CMD) >> 13;
+			EL3WINDOW(4);
+			data->val_out = mdio_read(ioaddr, data->phy_id & 0x1f,
+						  data->reg_num & 0x1f);
+			EL3WINDOW(saved_window);
+			spin_unlock_irqrestore(&lp->window_lock, flags);
+			return 0;
+		}
+	case SIOCSMIIREG:		/* Write the specified MII register */
+		{
+			int saved_window;
+                       unsigned long flags;
+
+			spin_lock_irqsave(&lp->window_lock, flags);
+			saved_window = inw(ioaddr + EL3_CMD) >> 13;
+			EL3WINDOW(4);
+			mdio_write(ioaddr, data->phy_id & 0x1f,
+				   data->reg_num & 0x1f, data->val_in);
+			EL3WINDOW(saved_window);
+			spin_unlock_irqrestore(&lp->window_lock, flags);
+			return 0;
+		}
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+/* The Odie chip has a 64 bin multicast filter, but the bit layout is not
+   documented.  Until it is we revert to receiving all multicast frames when
+   any multicast reception is desired.
+   Note: My other drivers emit a log message whenever promiscuous mode is
+   entered to help detect password sniffers.  This is less desirable on
+   typical PC card machines, so we omit the message.
+   */
+
+static void set_rx_mode(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+
+	if (dev->flags & IFF_PROMISC)
+		outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
+			 ioaddr + EL3_CMD);
+	else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
+		outw(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
+	else
+		outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+	struct el3_private *lp = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&lp->window_lock, flags);
+	set_rx_mode(dev);
+	spin_unlock_irqrestore(&lp->window_lock, flags);
+}
+
+static int el3_close(struct net_device *dev)
+{
+	unsigned int ioaddr = dev->base_addr;
+	struct el3_private *lp = netdev_priv(dev);
+	struct pcmcia_device *link = lp->p_dev;
+
+	dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
+	
+	if (pcmcia_dev_present(link)) {
+		unsigned long flags;
+
+		/* 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);
+		
+		/* Note: Switching to window 0 may disable the IRQ. */
+		EL3WINDOW(0);
+		spin_lock_irqsave(&lp->window_lock, flags);
+		update_stats(dev);
+		spin_unlock_irqrestore(&lp->window_lock, flags);
+
+		/* force interrupts off */
+		outw(SetIntrEnb | 0x0000, ioaddr + EL3_CMD);
+	}
+
+	link->open--;
+	netif_stop_queue(dev);
+	del_timer_sync(&lp->media);
+
+	return 0;
+}
+
+static const struct pcmcia_device_id tc574_ids[] = {
+	PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0574),
+	PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0556, "cis/3CCFEM556.cis"),
+	PCMCIA_DEVICE_NULL,
+};
+MODULE_DEVICE_TABLE(pcmcia, tc574_ids);
+
+static struct pcmcia_driver tc574_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "3c574_cs",
+	.probe		= tc574_probe,
+	.remove		= tc574_detach,
+	.id_table       = tc574_ids,
+	.suspend	= tc574_suspend,
+	.resume		= tc574_resume,
+};
+module_pcmcia_driver(tc574_driver);