Initial import

1 files changed, 1084 insertions, 0 deletions

diff --git a/drivers/net/ethernet/8390/lib8390.c b/drivers/net/ethernet/8390/lib8390.c
new file mode 100644
index 000000000..b96e8852b
--- /dev/null
+++ b/drivers/net/ethernet/8390/lib8390.c
@@ -0,0 +1,1084 @@
+/* 8390.c: A general NS8390 ethernet driver core for linux. */
+/*
+	Written 1992-94 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 General Public License, incorporated herein by reference.
+
+	The author may be reached as becker@scyld.com, or C/O
+	Scyld Computing Corporation
+	410 Severn Ave., Suite 210
+	Annapolis MD 21403
+
+
+  This is the chip-specific code for many 8390-based ethernet adaptors.
+  This is not a complete driver, it must be combined with board-specific
+  code such as ne.c, wd.c, 3c503.c, etc.
+
+  Seeing how at least eight drivers use this code, (not counting the
+  PCMCIA ones either) it is easy to break some card by what seems like
+  a simple innocent change. Please contact me or Donald if you think
+  you have found something that needs changing. -- PG
+
+
+  Changelog:
+
+  Paul Gortmaker	: remove set_bit lock, other cleanups.
+  Paul Gortmaker	: add ei_get_8390_hdr() so we can pass skb's to
+			  ei_block_input() for eth_io_copy_and_sum().
+  Paul Gortmaker	: exchange static int ei_pingpong for a #define,
+			  also add better Tx error handling.
+  Paul Gortmaker	: rewrite Rx overrun handling as per NS specs.
+  Alexey Kuznetsov	: use the 8390's six bit hash multicast filter.
+  Paul Gortmaker	: tweak ANK's above multicast changes a bit.
+  Paul Gortmaker	: update packet statistics for v2.1.x
+  Alan Cox		: support arbitrary stupid port mappings on the
+			  68K Macintosh. Support >16bit I/O spaces
+  Paul Gortmaker	: add kmod support for auto-loading of the 8390
+			  module by all drivers that require it.
+  Alan Cox		: Spinlocking work, added 'BUG_83C690'
+  Paul Gortmaker	: Separate out Tx timeout code from Tx path.
+  Paul Gortmaker	: Remove old unused single Tx buffer code.
+  Hayato Fujiwara	: Add m32r support.
+  Paul Gortmaker	: use skb_padto() instead of stack scratch area
+
+  Sources:
+  The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
+
+  */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/bitops.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/in.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#define NS8390_CORE
+#include "8390.h"
+
+#define BUG_83C690
+
+/* These are the operational function interfaces to board-specific
+   routines.
+	void reset_8390(struct net_device *dev)
+		Resets the board associated with DEV, including a hardware reset of
+		the 8390.  This is only called when there is a transmit timeout, and
+		it is always followed by 8390_init().
+	void block_output(struct net_device *dev, int count, const unsigned char *buf,
+					  int start_page)
+		Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
+		"page" value uses the 8390's 256-byte pages.
+	void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
+		Read the 4 byte, page aligned 8390 header. *If* there is a
+		subsequent read, it will be of the rest of the packet.
+	void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
+		Read COUNT bytes from the packet buffer into the skb data area. Start
+		reading from RING_OFFSET, the address as the 8390 sees it.  This will always
+		follow the read of the 8390 header.
+*/
+#define ei_reset_8390 (ei_local->reset_8390)
+#define ei_block_output (ei_local->block_output)
+#define ei_block_input (ei_local->block_input)
+#define ei_get_8390_hdr (ei_local->get_8390_hdr)
+
+/* Index to functions. */
+static void ei_tx_intr(struct net_device *dev);
+static void ei_tx_err(struct net_device *dev);
+static void ei_receive(struct net_device *dev);
+static void ei_rx_overrun(struct net_device *dev);
+
+/* Routines generic to NS8390-based boards. */
+static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
+								int start_page);
+static void do_set_multicast_list(struct net_device *dev);
+static void __NS8390_init(struct net_device *dev, int startp);
+
+static unsigned version_printed;
+static u32 msg_enable;
+module_param(msg_enable, uint, (S_IRUSR|S_IRGRP|S_IROTH));
+MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
+
+/*
+ *	SMP and the 8390 setup.
+ *
+ *	The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
+ *	a page register that controls bank and packet buffer access. We guard
+ *	this with ei_local->page_lock. Nobody should assume or set the page other
+ *	than zero when the lock is not held. Lock holders must restore page 0
+ *	before unlocking. Even pure readers must take the lock to protect in
+ *	page 0.
+ *
+ *	To make life difficult the chip can also be very slow. We therefore can't
+ *	just use spinlocks. For the longer lockups we disable the irq the device
+ *	sits on and hold the lock. We must hold the lock because there is a dual
+ *	processor case other than interrupts (get stats/set multicast list in
+ *	parallel with each other and transmit).
+ *
+ *	Note: in theory we can just disable the irq on the card _but_ there is
+ *	a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
+ *	enter lock, take the queued irq. So we waddle instead of flying.
+ *
+ *	Finally by special arrangement for the purpose of being generally
+ *	annoying the transmit function is called bh atomic. That places
+ *	restrictions on the user context callers as disable_irq won't save
+ *	them.
+ *
+ *	Additional explanation of problems with locking by Alan Cox:
+ *
+ *	"The author (me) didn't use spin_lock_irqsave because the slowness of the
+ *	card means that approach caused horrible problems like losing serial data
+ *	at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
+ *	chips with FPGA front ends.
+ *
+ *	Ok the logic behind the 8390 is very simple:
+ *
+ *	Things to know
+ *		- IRQ delivery is asynchronous to the PCI bus
+ *		- Blocking the local CPU IRQ via spin locks was too slow
+ *		- The chip has register windows needing locking work
+ *
+ *	So the path was once (I say once as people appear to have changed it
+ *	in the mean time and it now looks rather bogus if the changes to use
+ *	disable_irq_nosync_irqsave are disabling the local IRQ)
+ *
+ *
+ *		Take the page lock
+ *		Mask the IRQ on chip
+ *		Disable the IRQ (but not mask locally- someone seems to have
+ *			broken this with the lock validator stuff)
+ *			[This must be _nosync as the page lock may otherwise
+ *				deadlock us]
+ *		Drop the page lock and turn IRQs back on
+ *
+ *		At this point an existing IRQ may still be running but we can't
+ *		get a new one
+ *
+ *		Take the lock (so we know the IRQ has terminated) but don't mask
+ *	the IRQs on the processor
+ *		Set irqlock [for debug]
+ *
+ *		Transmit (slow as ****)
+ *
+ *		re-enable the IRQ
+ *
+ *
+ *	We have to use disable_irq because otherwise you will get delayed
+ *	interrupts on the APIC bus deadlocking the transmit path.
+ *
+ *	Quite hairy but the chip simply wasn't designed for SMP and you can't
+ *	even ACK an interrupt without risking corrupting other parallel
+ *	activities on the chip." [lkml, 25 Jul 2007]
+ */
+
+
+
+/**
+ * ei_open - Open/initialize the board.
+ * @dev: network device to initialize
+ *
+ * This routine goes all-out, setting everything
+ * up anew at each open, even though many of these registers should only
+ * need to be set once at boot.
+ */
+static int __ei_open(struct net_device *dev)
+{
+	unsigned long flags;
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	if (dev->watchdog_timeo <= 0)
+		dev->watchdog_timeo = TX_TIMEOUT;
+
+	/*
+	 *	Grab the page lock so we own the register set, then call
+	 *	the init function.
+	 */
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	__NS8390_init(dev, 1);
+	/* Set the flag before we drop the lock, That way the IRQ arrives
+	   after its set and we get no silly warnings */
+	netif_start_queue(dev);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+	ei_local->irqlock = 0;
+	return 0;
+}
+
+/**
+ * ei_close - shut down network device
+ * @dev: network device to close
+ *
+ * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
+ */
+static int __ei_close(struct net_device *dev)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	unsigned long flags;
+
+	/*
+	 *	Hold the page lock during close
+	 */
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	__NS8390_init(dev, 0);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+	netif_stop_queue(dev);
+	return 0;
+}
+
+/**
+ * ei_tx_timeout - handle transmit time out condition
+ * @dev: network device which has apparently fallen asleep
+ *
+ * Called by kernel when device never acknowledges a transmit has
+ * completed (or failed) - i.e. never posted a Tx related interrupt.
+ */
+
+static void __ei_tx_timeout(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
+	unsigned long flags;
+
+	dev->stats.tx_errors++;
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	txsr = ei_inb(e8390_base+EN0_TSR);
+	isr = ei_inb(e8390_base+EN0_ISR);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+
+	netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n",
+		   (txsr & ENTSR_ABT) ? "excess collisions." :
+		   (isr) ? "lost interrupt?" : "cable problem?",
+		   txsr, isr, tickssofar);
+
+	if (!isr && !dev->stats.tx_packets) {
+		/* The 8390 probably hasn't gotten on the cable yet. */
+		ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
+	}
+
+	/* Ugly but a reset can be slow, yet must be protected */
+
+	disable_irq_nosync_lockdep(dev->irq);
+	spin_lock(&ei_local->page_lock);
+
+	/* Try to restart the card.  Perhaps the user has fixed something. */
+	ei_reset_8390(dev);
+	__NS8390_init(dev, 1);
+
+	spin_unlock(&ei_local->page_lock);
+	enable_irq_lockdep(dev->irq);
+	netif_wake_queue(dev);
+}
+
+/**
+ * ei_start_xmit - begin packet transmission
+ * @skb: packet to be sent
+ * @dev: network device to which packet is sent
+ *
+ * Sends a packet to an 8390 network device.
+ */
+
+static netdev_tx_t __ei_start_xmit(struct sk_buff *skb,
+				   struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	int send_length = skb->len, output_page;
+	unsigned long flags;
+	char buf[ETH_ZLEN];
+	char *data = skb->data;
+
+	if (skb->len < ETH_ZLEN) {
+		memset(buf, 0, ETH_ZLEN);	/* more efficient than doing just the needed bits */
+		memcpy(buf, data, skb->len);
+		send_length = ETH_ZLEN;
+		data = buf;
+	}
+
+	/* Mask interrupts from the ethercard.
+	   SMP: We have to grab the lock here otherwise the IRQ handler
+	   on another CPU can flip window and race the IRQ mask set. We end
+	   up trashing the mcast filter not disabling irqs if we don't lock */
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	ei_outb_p(0x00, e8390_base + EN0_IMR);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+
+
+	/*
+	 *	Slow phase with lock held.
+	 */
+
+	disable_irq_nosync_lockdep_irqsave(dev->irq, &flags);
+
+	spin_lock(&ei_local->page_lock);
+
+	ei_local->irqlock = 1;
+
+	/*
+	 * We have two Tx slots available for use. Find the first free
+	 * slot, and then perform some sanity checks. With two Tx bufs,
+	 * you get very close to transmitting back-to-back packets. With
+	 * only one Tx buf, the transmitter sits idle while you reload the
+	 * card, leaving a substantial gap between each transmitted packet.
+	 */
+
+	if (ei_local->tx1 == 0) {
+		output_page = ei_local->tx_start_page;
+		ei_local->tx1 = send_length;
+		if ((netif_msg_tx_queued(ei_local)) &&
+		    ei_local->tx2 > 0)
+			netdev_dbg(dev,
+				   "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
+				   ei_local->tx2, ei_local->lasttx, ei_local->txing);
+	} else if (ei_local->tx2 == 0) {
+		output_page = ei_local->tx_start_page + TX_PAGES/2;
+		ei_local->tx2 = send_length;
+		if ((netif_msg_tx_queued(ei_local)) &&
+		    ei_local->tx1 > 0)
+			netdev_dbg(dev,
+				   "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
+				   ei_local->tx1, ei_local->lasttx, ei_local->txing);
+	} else {			/* We should never get here. */
+		netif_dbg(ei_local, tx_err, dev,
+			  "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
+			  ei_local->tx1, ei_local->tx2, ei_local->lasttx);
+		ei_local->irqlock = 0;
+		netif_stop_queue(dev);
+		ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
+		spin_unlock(&ei_local->page_lock);
+		enable_irq_lockdep_irqrestore(dev->irq, &flags);
+		dev->stats.tx_errors++;
+		return NETDEV_TX_BUSY;
+	}
+
+	/*
+	 * Okay, now upload the packet and trigger a send if the transmitter
+	 * isn't already sending. If it is busy, the interrupt handler will
+	 * trigger the send later, upon receiving a Tx done interrupt.
+	 */
+
+	ei_block_output(dev, send_length, data, output_page);
+
+	if (!ei_local->txing) {
+		ei_local->txing = 1;
+		NS8390_trigger_send(dev, send_length, output_page);
+		if (output_page == ei_local->tx_start_page) {
+			ei_local->tx1 = -1;
+			ei_local->lasttx = -1;
+		} else {
+			ei_local->tx2 = -1;
+			ei_local->lasttx = -2;
+		}
+	} else
+		ei_local->txqueue++;
+
+	if (ei_local->tx1 && ei_local->tx2)
+		netif_stop_queue(dev);
+	else
+		netif_start_queue(dev);
+
+	/* Turn 8390 interrupts back on. */
+	ei_local->irqlock = 0;
+	ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
+
+	spin_unlock(&ei_local->page_lock);
+	enable_irq_lockdep_irqrestore(dev->irq, &flags);
+	skb_tx_timestamp(skb);
+	dev_consume_skb_any(skb);
+	dev->stats.tx_bytes += send_length;
+
+	return NETDEV_TX_OK;
+}
+
+/**
+ * ei_interrupt - handle the interrupts from an 8390
+ * @irq: interrupt number
+ * @dev_id: a pointer to the net_device
+ *
+ * Handle the ether interface interrupts. We pull packets from
+ * the 8390 via the card specific functions and fire them at the networking
+ * stack. We also handle transmit completions and wake the transmit path if
+ * necessary. We also update the counters and do other housekeeping as
+ * needed.
+ */
+
+static irqreturn_t __ei_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	unsigned long e8390_base = dev->base_addr;
+	int interrupts, nr_serviced = 0;
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	/*
+	 *	Protect the irq test too.
+	 */
+
+	spin_lock(&ei_local->page_lock);
+
+	if (ei_local->irqlock) {
+		/*
+		 * This might just be an interrupt for a PCI device sharing
+		 * this line
+		 */
+		netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n",
+			   ei_inb_p(e8390_base + EN0_ISR),
+			   ei_inb_p(e8390_base + EN0_IMR));
+		spin_unlock(&ei_local->page_lock);
+		return IRQ_NONE;
+	}
+
+	/* Change to page 0 and read the intr status reg. */
+	ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
+	netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n",
+		  ei_inb_p(e8390_base + EN0_ISR));
+
+	/* !!Assumption!! -- we stay in page 0.	 Don't break this. */
+	while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 &&
+	       ++nr_serviced < MAX_SERVICE) {
+		if (!netif_running(dev)) {
+			netdev_warn(dev, "interrupt from stopped card\n");
+			/* rmk - acknowledge the interrupts */
+			ei_outb_p(interrupts, e8390_base + EN0_ISR);
+			interrupts = 0;
+			break;
+		}
+		if (interrupts & ENISR_OVER)
+			ei_rx_overrun(dev);
+		else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) {
+			/* Got a good (?) packet. */
+			ei_receive(dev);
+		}
+		/* Push the next to-transmit packet through. */
+		if (interrupts & ENISR_TX)
+			ei_tx_intr(dev);
+		else if (interrupts & ENISR_TX_ERR)
+			ei_tx_err(dev);
+
+		if (interrupts & ENISR_COUNTERS) {
+			dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
+			dev->stats.rx_crc_errors   += ei_inb_p(e8390_base + EN0_COUNTER1);
+			dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2);
+			ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
+		}
+
+		/* Ignore any RDC interrupts that make it back to here. */
+		if (interrupts & ENISR_RDC)
+			ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
+
+		ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
+	}
+
+	if (interrupts && (netif_msg_intr(ei_local))) {
+		ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
+		if (nr_serviced >= MAX_SERVICE) {
+			/* 0xFF is valid for a card removal */
+			if (interrupts != 0xFF)
+				netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n",
+					    interrupts);
+			ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
+		} else {
+			netdev_warn(dev, "unknown interrupt %#2x\n", interrupts);
+			ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
+		}
+	}
+	spin_unlock(&ei_local->page_lock);
+	return IRQ_RETVAL(nr_serviced > 0);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void __ei_poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	__ei_interrupt(dev->irq, dev);
+	enable_irq(dev->irq);
+}
+#endif
+
+/**
+ * ei_tx_err - handle transmitter error
+ * @dev: network device which threw the exception
+ *
+ * A transmitter error has happened. Most likely excess collisions (which
+ * is a fairly normal condition). If the error is one where the Tx will
+ * have been aborted, we try and send another one right away, instead of
+ * letting the failed packet sit and collect dust in the Tx buffer. This
+ * is a much better solution as it avoids kernel based Tx timeouts, and
+ * an unnecessary card reset.
+ *
+ * Called with lock held.
+ */
+
+static void ei_tx_err(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	/* ei_local is used on some platforms via the EI_SHIFT macro */
+	struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
+	unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
+	unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
+
+#ifdef VERBOSE_ERROR_DUMP
+	netdev_dbg(dev, "transmitter error (%#2x):", txsr);
+	if (txsr & ENTSR_ABT)
+		pr_cont(" excess-collisions ");
+	if (txsr & ENTSR_ND)
+		pr_cont(" non-deferral ");
+	if (txsr & ENTSR_CRS)
+		pr_cont(" lost-carrier ");
+	if (txsr & ENTSR_FU)
+		pr_cont(" FIFO-underrun ");
+	if (txsr & ENTSR_CDH)
+		pr_cont(" lost-heartbeat ");
+	pr_cont("\n");
+#endif
+
+	ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
+
+	if (tx_was_aborted)
+		ei_tx_intr(dev);
+	else {
+		dev->stats.tx_errors++;
+		if (txsr & ENTSR_CRS)
+			dev->stats.tx_carrier_errors++;
+		if (txsr & ENTSR_CDH)
+			dev->stats.tx_heartbeat_errors++;
+		if (txsr & ENTSR_OWC)
+			dev->stats.tx_window_errors++;
+	}
+}
+
+/**
+ * ei_tx_intr - transmit interrupt handler
+ * @dev: network device for which tx intr is handled
+ *
+ * We have finished a transmit: check for errors and then trigger the next
+ * packet to be sent. Called with lock held.
+ */
+
+static void ei_tx_intr(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	int status = ei_inb(e8390_base + EN0_TSR);
+
+	ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
+
+	/*
+	 * There are two Tx buffers, see which one finished, and trigger
+	 * the send of another one if it exists.
+	 */
+	ei_local->txqueue--;
+
+	if (ei_local->tx1 < 0) {
+		if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
+			pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n",
+			       ei_local->name, ei_local->lasttx, ei_local->tx1);
+		ei_local->tx1 = 0;
+		if (ei_local->tx2 > 0) {
+			ei_local->txing = 1;
+			NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
+			dev->trans_start = jiffies;
+			ei_local->tx2 = -1,
+			ei_local->lasttx = 2;
+		} else
+			ei_local->lasttx = 20, ei_local->txing = 0;
+	} else if (ei_local->tx2 < 0) {
+		if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
+			pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n",
+			       ei_local->name, ei_local->lasttx, ei_local->tx2);
+		ei_local->tx2 = 0;
+		if (ei_local->tx1 > 0) {
+			ei_local->txing = 1;
+			NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
+			dev->trans_start = jiffies;
+			ei_local->tx1 = -1;
+			ei_local->lasttx = 1;
+		} else
+			ei_local->lasttx = 10, ei_local->txing = 0;
+	} /* else
+		netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
+			    ei_local->lasttx);
+*/
+
+	/* Minimize Tx latency: update the statistics after we restart TXing. */
+	if (status & ENTSR_COL)
+		dev->stats.collisions++;
+	if (status & ENTSR_PTX)
+		dev->stats.tx_packets++;
+	else {
+		dev->stats.tx_errors++;
+		if (status & ENTSR_ABT) {
+			dev->stats.tx_aborted_errors++;
+			dev->stats.collisions += 16;
+		}
+		if (status & ENTSR_CRS)
+			dev->stats.tx_carrier_errors++;
+		if (status & ENTSR_FU)
+			dev->stats.tx_fifo_errors++;
+		if (status & ENTSR_CDH)
+			dev->stats.tx_heartbeat_errors++;
+		if (status & ENTSR_OWC)
+			dev->stats.tx_window_errors++;
+	}
+	netif_wake_queue(dev);
+}
+
+/**
+ * ei_receive - receive some packets
+ * @dev: network device with which receive will be run
+ *
+ * We have a good packet(s), get it/them out of the buffers.
+ * Called with lock held.
+ */
+
+static void ei_receive(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	unsigned char rxing_page, this_frame, next_frame;
+	unsigned short current_offset;
+	int rx_pkt_count = 0;
+	struct e8390_pkt_hdr rx_frame;
+	int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
+
+	while (++rx_pkt_count < 10) {
+		int pkt_len, pkt_stat;
+
+		/* Get the rx page (incoming packet pointer). */
+		ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
+		rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
+		ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
+
+		/* Remove one frame from the ring.  Boundary is always a page behind. */
+		this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1;
+		if (this_frame >= ei_local->stop_page)
+			this_frame = ei_local->rx_start_page;
+
+		/* Someday we'll omit the previous, iff we never get this message.
+		   (There is at least one clone claimed to have a problem.)
+
+		   Keep quiet if it looks like a card removal. One problem here
+		   is that some clones crash in roughly the same way.
+		 */
+		if ((netif_msg_rx_status(ei_local)) &&
+		    this_frame != ei_local->current_page &&
+		    (this_frame != 0x0 || rxing_page != 0xFF))
+			netdev_err(dev,
+				   "mismatched read page pointers %2x vs %2x\n",
+				   this_frame, ei_local->current_page);
+
+		if (this_frame == rxing_page)	/* Read all the frames? */
+			break;				/* Done for now */
+
+		current_offset = this_frame << 8;
+		ei_get_8390_hdr(dev, &rx_frame, this_frame);
+
+		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
+		pkt_stat = rx_frame.status;
+
+		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
+
+		/* Check for bogosity warned by 3c503 book: the status byte is never
+		   written.  This happened a lot during testing! This code should be
+		   cleaned up someday. */
+		if (rx_frame.next != next_frame &&
+		    rx_frame.next != next_frame + 1 &&
+		    rx_frame.next != next_frame - num_rx_pages &&
+		    rx_frame.next != next_frame + 1 - num_rx_pages) {
+			ei_local->current_page = rxing_page;
+			ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
+			dev->stats.rx_errors++;
+			continue;
+		}
+
+		if (pkt_len < 60  ||  pkt_len > 1518) {
+			netif_dbg(ei_local, rx_status, dev,
+				  "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
+				  rx_frame.count, rx_frame.status,
+				  rx_frame.next);
+			dev->stats.rx_errors++;
+			dev->stats.rx_length_errors++;
+		} else if ((pkt_stat & 0x0F) == ENRSR_RXOK) {
+			struct sk_buff *skb;
+
+			skb = netdev_alloc_skb(dev, pkt_len + 2);
+			if (skb == NULL) {
+				netif_err(ei_local, rx_err, dev,
+					  "Couldn't allocate a sk_buff of size %d\n",
+					  pkt_len);
+				dev->stats.rx_dropped++;
+				break;
+			} else {
+				skb_reserve(skb, 2);	/* IP headers on 16 byte boundaries */
+				skb_put(skb, pkt_len);	/* Make room */
+				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
+				skb->protocol = eth_type_trans(skb, dev);
+				if (!skb_defer_rx_timestamp(skb))
+					netif_rx(skb);
+				dev->stats.rx_packets++;
+				dev->stats.rx_bytes += pkt_len;
+				if (pkt_stat & ENRSR_PHY)
+					dev->stats.multicast++;
+			}
+		} else {
+			netif_err(ei_local, rx_err, dev,
+				  "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
+				  rx_frame.status, rx_frame.next,
+				  rx_frame.count);
+			dev->stats.rx_errors++;
+			/* NB: The NIC counts CRC, frame and missed errors. */
+			if (pkt_stat & ENRSR_FO)
+				dev->stats.rx_fifo_errors++;
+		}
+		next_frame = rx_frame.next;
+
+		/* This _should_ never happen: it's here for avoiding bad clones. */
+		if (next_frame >= ei_local->stop_page) {
+			netdev_notice(dev, "next frame inconsistency, %#2x\n",
+				      next_frame);
+			next_frame = ei_local->rx_start_page;
+		}
+		ei_local->current_page = next_frame;
+		ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
+	}
+
+	/* We used to also ack ENISR_OVER here, but that would sometimes mask
+	   a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
+	ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
+}
+
+/**
+ * ei_rx_overrun - handle receiver overrun
+ * @dev: network device which threw exception
+ *
+ * We have a receiver overrun: we have to kick the 8390 to get it started
+ * again. Problem is that you have to kick it exactly as NS prescribes in
+ * the updated datasheets, or "the NIC may act in an unpredictable manner."
+ * This includes causing "the NIC to defer indefinitely when it is stopped
+ * on a busy network."  Ugh.
+ * Called with lock held. Don't call this with the interrupts off or your
+ * computer will hate you - it takes 10ms or so.
+ */
+
+static void ei_rx_overrun(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	unsigned char was_txing, must_resend = 0;
+	/* ei_local is used on some platforms via the EI_SHIFT macro */
+	struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
+
+	/*
+	 * Record whether a Tx was in progress and then issue the
+	 * stop command.
+	 */
+	was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
+	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
+
+	netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n");
+	dev->stats.rx_over_errors++;
+
+	/*
+	 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
+	 * Early datasheets said to poll the reset bit, but now they say that
+	 * it "is not a reliable indicator and subsequently should be ignored."
+	 * We wait at least 10ms.
+	 */
+
+	mdelay(10);
+
+	/*
+	 * Reset RBCR[01] back to zero as per magic incantation.
+	 */
+	ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
+	ei_outb_p(0x00, e8390_base+EN0_RCNTHI);
+
+	/*
+	 * See if any Tx was interrupted or not. According to NS, this
+	 * step is vital, and skipping it will cause no end of havoc.
+	 */
+
+	if (was_txing) {
+		unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
+		if (!tx_completed)
+			must_resend = 1;
+	}
+
+	/*
+	 * Have to enter loopback mode and then restart the NIC before
+	 * you are allowed to slurp packets up off the ring.
+	 */
+	ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
+	ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
+
+	/*
+	 * Clear the Rx ring of all the debris, and ack the interrupt.
+	 */
+	ei_receive(dev);
+	ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR);
+
+	/*
+	 * Leave loopback mode, and resend any packet that got stopped.
+	 */
+	ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
+	if (must_resend)
+		ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
+}
+
+/*
+ *	Collect the stats. This is called unlocked and from several contexts.
+ */
+
+static struct net_device_stats *__ei_get_stats(struct net_device *dev)
+{
+	unsigned long ioaddr = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	unsigned long flags;
+
+	/* If the card is stopped, just return the present stats. */
+	if (!netif_running(dev))
+		return &dev->stats;
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	/* Read the counter registers, assuming we are in page 0. */
+	dev->stats.rx_frame_errors  += ei_inb_p(ioaddr + EN0_COUNTER0);
+	dev->stats.rx_crc_errors    += ei_inb_p(ioaddr + EN0_COUNTER1);
+	dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+
+	return &dev->stats;
+}
+
+/*
+ * Form the 64 bit 8390 multicast table from the linked list of addresses
+ * associated with this dev structure.
+ */
+
+static inline void make_mc_bits(u8 *bits, struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+
+	netdev_for_each_mc_addr(ha, dev) {
+		u32 crc = ether_crc(ETH_ALEN, ha->addr);
+		/*
+		 * The 8390 uses the 6 most significant bits of the
+		 * CRC to index the multicast table.
+		 */
+		bits[crc>>29] |= (1<<((crc>>26)&7));
+	}
+}
+
+/**
+ * do_set_multicast_list - set/clear multicast filter
+ * @dev: net device for which multicast filter is adjusted
+ *
+ *	Set or clear the multicast filter for this adaptor. May be called
+ *	from a BH in 2.1.x. Must be called with lock held.
+ */
+
+static void do_set_multicast_list(struct net_device *dev)
+{
+	unsigned long e8390_base = dev->base_addr;
+	int i;
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
+		memset(ei_local->mcfilter, 0, 8);
+		if (!netdev_mc_empty(dev))
+			make_mc_bits(ei_local->mcfilter, dev);
+	} else
+		memset(ei_local->mcfilter, 0xFF, 8);	/* mcast set to accept-all */
+
+	/*
+	 * DP8390 manuals don't specify any magic sequence for altering
+	 * the multicast regs on an already running card. To be safe, we
+	 * ensure multicast mode is off prior to loading up the new hash
+	 * table. If this proves to be not enough, we can always resort
+	 * to stopping the NIC, loading the table and then restarting.
+	 *
+	 * Bug Alert!  The MC regs on the SMC 83C690 (SMC Elite and SMC
+	 * Elite16) appear to be write-only. The NS 8390 data sheet lists
+	 * them as r/w so this is a bug.  The SMC 83C790 (SMC Ultra and
+	 * Ultra32 EISA) appears to have this bug fixed.
+	 */
+
+	if (netif_running(dev))
+		ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
+	ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
+	for (i = 0; i < 8; i++) {
+		ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
+#ifndef BUG_83C690
+		if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i])
+			netdev_err(dev, "Multicast filter read/write mismap %d\n",
+				   i);
+#endif
+	}
+	ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
+
+	if (dev->flags&IFF_PROMISC)
+		ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
+	else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
+		ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
+	else
+		ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
+}
+
+/*
+ *	Called without lock held. This is invoked from user context and may
+ *	be parallel to just about everything else. Its also fairly quick and
+ *	not called too often. Must protect against both bh and irq users
+ */
+
+static void __ei_set_multicast_list(struct net_device *dev)
+{
+	unsigned long flags;
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	spin_lock_irqsave(&ei_local->page_lock, flags);
+	do_set_multicast_list(dev);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+}
+
+/**
+ * ethdev_setup - init rest of 8390 device struct
+ * @dev: network device structure to init
+ *
+ * Initialize the rest of the 8390 device structure.  Do NOT __init
+ * this, as it is used by 8390 based modular drivers too.
+ */
+
+static void ethdev_setup(struct net_device *dev)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	if ((msg_enable & NETIF_MSG_DRV) && (version_printed++ == 0))
+		pr_info("%s", version);
+
+	ether_setup(dev);
+
+	spin_lock_init(&ei_local->page_lock);
+}
+
+/**
+ * alloc_ei_netdev - alloc_etherdev counterpart for 8390
+ * @size: extra bytes to allocate
+ *
+ * Allocate 8390-specific net_device.
+ */
+static struct net_device *____alloc_ei_netdev(int size)
+{
+	return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
+			    NET_NAME_UNKNOWN, ethdev_setup);
+}
+
+
+
+
+/* This page of functions should be 8390 generic */
+/* Follow National Semi's recommendations for initializing the "NIC". */
+
+/**
+ * NS8390_init - initialize 8390 hardware
+ * @dev: network device to initialize
+ * @startp: boolean.  non-zero value to initiate chip processing
+ *
+ *	Must be called with lock held.
+ */
+
+static void __NS8390_init(struct net_device *dev, int startp)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local = netdev_priv(dev);
+	int i;
+	int endcfg = ei_local->word16
+	    ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
+	    : 0x48;
+
+	if (sizeof(struct e8390_pkt_hdr) != 4)
+		panic("8390.c: header struct mispacked\n");
+	/* Follow National Semi's recommendations for initing the DP83902. */
+	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
+	ei_outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
+	/* Clear the remote byte count registers. */
+	ei_outb_p(0x00,  e8390_base + EN0_RCNTLO);
+	ei_outb_p(0x00,  e8390_base + EN0_RCNTHI);
+	/* Set to monitor and loopback mode -- this is vital!. */
+	ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
+	ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
+	/* Set the transmit page and receive ring. */
+	ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
+	ei_local->tx1 = ei_local->tx2 = 0;
+	ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
+	ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);	/* 3c503 says 0x3f,NS0x26*/
+	ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
+	ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
+	/* Clear the pending interrupts and mask. */
+	ei_outb_p(0xFF, e8390_base + EN0_ISR);
+	ei_outb_p(0x00,  e8390_base + EN0_IMR);
+
+	/* Copy the station address into the DS8390 registers. */
+
+	ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
+	for (i = 0; i < 6; i++) {
+		ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
+		if ((netif_msg_probe(ei_local)) &&
+		    ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i])
+			netdev_err(dev,
+				   "Hw. address read/write mismap %d\n", i);
+	}
+
+	ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
+	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
+
+	ei_local->tx1 = ei_local->tx2 = 0;
+	ei_local->txing = 0;
+
+	if (startp) {
+		ei_outb_p(0xff,  e8390_base + EN0_ISR);
+		ei_outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
+		ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
+		ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
+		/* 3c503 TechMan says rxconfig only after the NIC is started. */
+		ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on,  */
+		do_set_multicast_list(dev);	/* (re)load the mcast table */
+	}
+}
+
+/* Trigger a transmit start, assuming the length is valid.
+   Always called with the page lock held */
+
+static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
+								int start_page)
+{
+	unsigned long e8390_base = dev->base_addr;
+	struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
+
+	ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
+
+	if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) {
+		netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
+		return;
+	}
+	ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
+	ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
+	ei_outb_p(start_page, e8390_base + EN0_TPSR);
+	ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
+}