text: /* lance.c: An AMD LANCE/PCnet ethernet driver for Linux. */
  /*
  	Written/copyright 1993-1998 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 General Public License, incorporated herein by reference.
  
  	This driver is for the Allied Telesis AT1500 and HP J2405A, and should work
  	with most other LANCE-based bus-master (NE2100/NE2500) ethercards.
  
  	The author may be reached as becker@scyld.com, or C/O
  	Scyld Computing Corporation
  	410 Severn Ave., Suite 210
  	Annapolis MD 21403
  
  	Andrey V. Savochkin:
  	- alignment problem with 1.3.* kernel and some minor changes.
  	Thomas Bogendoerfer (tsbogend@bigbug.franken.de):
  	- added support for Linux/Alpha, but removed most of it, because
          it worked only for the PCI chip. 
        - added hook for the 32bit lance driver
        - added PCnetPCI II (79C970A) to chip table
  	Paul Gortmaker (gpg109@rsphy1.anu.edu.au):
  	- hopefully fix above so Linux/Alpha can use ISA cards too.
      8/20/96 Fixed 7990 autoIRQ failure and reversed unneeded alignment -djb
      v1.12 10/27/97 Module support -djb
      v1.14  2/3/98 Module support modified, made PCI support optional -djb
      v1.15 5/27/99 Fixed bug in the cleanup_module(). dev->priv was freed
                    before unregister_netdev() which caused NULL pointer
                    reference later in the chain (in rtnetlink_fill_ifinfo())
                    -- Mika Kuoppala <miku@iki.fi>
      
      Forward ported v1.14 to 2.1.129, merged the PCI and misc changes from
      the 2.1 version of the old driver - Alan Cox
  
      Get rid of check_region, check kmalloc return in lance_probe1
      Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
  
  	Reworked detection, added support for Racal InterLan EtherBlaster cards
  	Vesselin Kostadinov <vesok at yahoo dot com > - 22/4/2004
  */
  
  static const char version[] = "lance.c:v1.15ac 1999/11/13 dplatt@3do.com, becker@cesdis.gsfc.nasa.gov\n";
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/delay.h>
  #include <linux/errno.h>
  #include <linux/ioport.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/bitops.h>
  
  #include <asm/io.h>
  #include <asm/dma.h>
  
  static unsigned int lance_portlist[] __initdata = { 0x300, 0x320, 0x340, 0x360, 0};
  static int lance_probe1(struct net_device *dev, int ioaddr, int irq, int options);
  static int __init do_lance_probe(struct net_device *dev);
  
  
  static struct card {
  	char id_offset14;
  	char id_offset15;
  } cards[] = {
  	{	//"normal"
  		.id_offset14 = 0x57,
  		.id_offset15 = 0x57,
  	},
  	{	//NI6510EB
  		.id_offset14 = 0x52,
  		.id_offset15 = 0x44,
  	},
  	{	//Racal InterLan EtherBlaster
  		.id_offset14 = 0x52,
  		.id_offset15 = 0x49,
  	},
  };
  #define NUM_CARDS 3
  
  #ifdef LANCE_DEBUG
  static int lance_debug = LANCE_DEBUG;
  #else
  static int lance_debug = 1;
  #endif
  
  /*
  				Theory of Operation
  
  I. Board Compatibility
  
  This device driver is designed for the AMD 79C960, the "PCnet-ISA
  single-chip ethernet controller for ISA".  This chip is used in a wide
  variety of boards from vendors such as Allied Telesis, HP, Kingston,
  and Boca.  This driver is also intended to work with older AMD 7990
  designs, such as the NE1500 and NE2100, and newer 79C961.  For convenience,
  I use the name LANCE to refer to all of the AMD chips, even though it properly
  refers only to the original 7990.
  
  II. Board-specific settings
  
  The driver is designed to work the boards that use the faster
  bus-master mode, rather than in shared memory mode.	 (Only older designs
  have on-board buffer memory needed to support the slower shared memory mode.)
  
  Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
  channel.  This driver probes the likely base addresses:
  {0x300, 0x320, 0x340, 0x360}.
  After the board is found it generates a DMA-timeout interrupt and uses
  autoIRQ to find the IRQ line.  The DMA channel can be set with the low bits
  of the otherwise-unused dev->mem_start value (aka PARAM1).  If unset it is
  probed for by enabling each free DMA channel in turn and checking if
  initialization succeeds.
  
  The HP-J2405A board is an exception: with this board it is easy to read the
  EEPROM-set values for the base, IRQ, and DMA.  (Of course you must already
  _know_ the base address -- that field is for writing the EEPROM.)
  
  III. Driver operation
  
  IIIa. Ring buffers
  The LANCE uses ring buffers of Tx and Rx descriptors.  Each entry describes
  the base and length of the data buffer, along with status bits.	 The length
  of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
  the buffer length (rather than being directly the buffer length) for
  implementation ease.  The current values are 2 (Tx) and 4 (Rx), which leads to
  ring sizes of 4 (Tx) and 16 (Rx).  Increasing the number of ring entries
  needlessly uses extra space and reduces the chance that an upper layer will
  be able to reorder queued Tx packets based on priority.	 Decreasing the number
  of entries makes it more difficult to achieve back-to-back packet transmission
  and increases the chance that Rx ring will overflow.  (Consider the worst case
  of receiving back-to-back minimum-sized packets.)
  
  The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
  statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
  avoid the administrative overhead. For the Rx side this avoids dynamically
  allocating full-sized buffers "just in case", at the expense of a
  memory-to-memory data copy for each packet received.  For most systems this
  is a good tradeoff: the Rx buffer will always be in low memory, the copy
  is inexpensive, and it primes the cache for later packet processing.  For Tx
  the buffers are only used when needed as low-memory bounce buffers.
  
  IIIB. 16M memory limitations.
  For the ISA bus master mode all structures used directly by the LANCE,
  the initialization block, Rx and Tx rings, and data buffers, must be
  accessible from the ISA bus, i.e. in the lower 16M of real memory.
  This is a problem for current Linux kernels on >16M machines. The network
  devices are initialized after memory initialization, and the kernel doles out
  memory from the top of memory downward.	 The current solution is to have a
  special network initialization routine that's called before memory
  initialization; this will eventually be generalized for all network devices.
  As mentioned before, low-memory "bounce-buffers" are used when needed.
  
  IIIC. Synchronization
  The driver runs as two independent, single-threaded flows of control.  One
  is the send-packet routine, which enforces single-threaded use by the
  dev->tbusy flag.  The other thread is the interrupt handler, which is single
  threaded by the hardware and other software.
  
  The send packet thread has partial control over the Tx ring and 'dev->tbusy'
  flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
  queue slot is empty, it clears the tbusy flag when finished otherwise it sets
  the 'lp->tx_full' flag.
  
  The interrupt handler has exclusive control over the Rx ring and records stats
  from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so
  we can't avoid the interrupt overhead by having the Tx routine reap the Tx
  stats.)	 After reaping the stats, it marks the queue entry as empty by setting
  the 'base' to zero. Iff the 'lp->tx_full' flag is set, it clears both the
  tx_full and tbusy flags.
  
  */
  
  /* Set the number of Tx and Rx buffers, using Log_2(# buffers).
     Reasonable default values are 16 Tx buffers, and 16 Rx buffers.
     That translates to 4 and 4 (16 == 2^^4).
     This is a compile-time option for efficiency.
     */
  #ifndef LANCE_LOG_TX_BUFFERS
  #define LANCE_LOG_TX_BUFFERS 4
  #define LANCE_LOG_RX_BUFFERS 4
  #endif
  
  #define TX_RING_SIZE			(1 << (LANCE_LOG_TX_BUFFERS))
  #define TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
  #define TX_RING_LEN_BITS		((LANCE_LOG_TX_BUFFERS) << 29)
  
  #define RX_RING_SIZE			(1 << (LANCE_LOG_RX_BUFFERS))
  #define RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
  #define RX_RING_LEN_BITS		((LANCE_LOG_RX_BUFFERS) << 29)
  
  #define PKT_BUF_SZ		1544
  
  /* Offsets from base I/O address. */
  #define LANCE_DATA 0x10
  #define LANCE_ADDR 0x12
  #define LANCE_RESET 0x14
  #define LANCE_BUS_IF 0x16
  #define LANCE_TOTAL_SIZE 0x18
  
  #define TX_TIMEOUT	20
  
  /* The LANCE Rx and Tx ring descriptors. */
  struct lance_rx_head {
  	s32 base;
  	s16 buf_length;			/* This length is 2s complement (negative)! */
  	s16 msg_length;			/* This length is "normal". */
  };
  
  struct lance_tx_head {
  	s32 base;
  	s16 length;				/* Length is 2s complement (negative)! */
  	s16 misc;
  };
  
  /* The LANCE initialization block, described in databook. */
  struct lance_init_block {
  	u16 mode;		/* Pre-set mode (reg. 15) */
  	u8  phys_addr[6]; /* Physical ethernet address */
  	u32 filter[2];			/* Multicast filter (unused). */
  	/* Receive and transmit ring base, along with extra bits. */
  	u32  rx_ring;			/* Tx and Rx ring base pointers */
  	u32  tx_ring;
  };
  
  struct lance_private {
  	/* The Tx and Rx ring entries must be aligned on 8-byte boundaries. */
  	struct lance_rx_head rx_ring[RX_RING_SIZE];
  	struct lance_tx_head tx_ring[TX_RING_SIZE];
  	struct lance_init_block	init_block;
  	const char *name;
  	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
  	struct sk_buff* tx_skbuff[TX_RING_SIZE];
  	/* The addresses of receive-in-place skbuffs. */
  	struct sk_buff* rx_skbuff[RX_RING_SIZE];
  	unsigned long rx_buffs;		/* Address of Rx and Tx buffers. */
  	/* Tx low-memory "bounce buffer" address. */
  	char (*tx_bounce_buffs)[PKT_BUF_SZ];
  	int cur_rx, cur_tx;			/* The next free ring entry */
  	int dirty_rx, dirty_tx;		/* The ring entries to be free()ed. */
  	int dma;
  	struct net_device_stats stats;
  	unsigned char chip_version;	/* See lance_chip_type. */
  	spinlock_t devlock;
  };
  
  #define LANCE_MUST_PAD          0x00000001
  #define LANCE_ENABLE_AUTOSELECT 0x00000002
  #define LANCE_MUST_REINIT_RING  0x00000004
  #define LANCE_MUST_UNRESET      0x00000008
  #define LANCE_HAS_MISSED_FRAME  0x00000010
  
  /* A mapping from the chip ID number to the part number and features.
     These are from the datasheets -- in real life the '970 version
     reportedly has the same ID as the '965. */
  static struct lance_chip_type {
  	int id_number;
  	const char *name;
  	int flags;
  } chip_table[] = {
  	{0x0000, "LANCE 7990",				/* Ancient lance chip.  */
  		LANCE_MUST_PAD + LANCE_MUST_UNRESET},
  	{0x0003, "PCnet/ISA 79C960",		/* 79C960 PCnet/ISA.  */
  		LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
  			LANCE_HAS_MISSED_FRAME},
  	{0x2260, "PCnet/ISA+ 79C961",		/* 79C961 PCnet/ISA+, Plug-n-Play.  */
  		LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
  			LANCE_HAS_MISSED_FRAME},
  	{0x2420, "PCnet/PCI 79C970",		/* 79C970 or 79C974 PCnet-SCSI, PCI. */
  		LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
  			LANCE_HAS_MISSED_FRAME},
  	/* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
  		it the PCnet32. */
  	{0x2430, "PCnet32",					/* 79C965 PCnet for VL bus. */
  		LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
  			LANCE_HAS_MISSED_FRAME},
          {0x2621, "PCnet/PCI-II 79C970A",        /* 79C970A PCInetPCI II. */
                  LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
                          LANCE_HAS_MISSED_FRAME},
  	{0x0, 	 "PCnet (unknown)",
  		LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
  			LANCE_HAS_MISSED_FRAME},
  };
  
  enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, PCNET_PCI_II=5, LANCE_UNKNOWN=6};
  
  
  /* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers.
     Assume yes until we know the memory size. */
  static unsigned char lance_need_isa_bounce_buffers = 1;
  
  static int lance_open(struct net_device *dev);
  static void lance_init_ring(struct net_device *dev, gfp_t mode);
  static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev);
  static int lance_rx(struct net_device *dev);
  static irqreturn_t lance_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  static int lance_close(struct net_device *dev);
  static struct net_device_stats *lance_get_stats(struct net_device *dev);
  static void set_multicast_list(struct net_device *dev);
  static void lance_tx_timeout (struct net_device *dev);
  
  
  
  #ifdef MODULE
  #define MAX_CARDS		8	/* Max number of interfaces (cards) per module */
  
  static struct net_device *dev_lance[MAX_CARDS];
  static int io[MAX_CARDS];
  static int dma[MAX_CARDS];
  static int irq[MAX_CARDS];
  
  module_param_array(io, int, NULL, 0);
  module_param_array(dma, int, NULL, 0);
  module_param_array(irq, int, NULL, 0);
  module_param(lance_debug, int, 0);
  MODULE_PARM_DESC(io, "LANCE/PCnet I/O base address(es),required");
  MODULE_PARM_DESC(dma, "LANCE/PCnet ISA DMA channel (ignored for some devices)");
  MODULE_PARM_DESC(irq, "LANCE/PCnet IRQ number (ignored for some devices)");
  MODULE_PARM_DESC(lance_debug, "LANCE/PCnet debug level (0-7)");
  
  int init_module(void)
  {
  	struct net_device *dev;
  	int this_dev, found = 0;
  
  	for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
  		if (io[this_dev] == 0)  {
  			if (this_dev != 0) /* only complain once */
  				break;
  			printk(KERN_NOTICE "lance.c: Module autoprobing not allowed. Append \"io=0xNNN\" value(s).\n");
  			return -EPERM;
  		}
  		dev = alloc_etherdev(0);
  		if (!dev)
  			break;
  		dev->irq = irq[this_dev];
  		dev->base_addr = io[this_dev];
  		dev->dma = dma[this_dev];
  		if (do_lance_probe(dev) == 0) {
  			dev_lance[found++] = dev;
  			continue;
  		}
  		free_netdev(dev);
  		break;
  	}
  	if (found != 0)
  		return 0;
  	return -ENXIO;
  }
  
  static void cleanup_card(struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  	if (dev->dma != 4)
  		free_dma(dev->dma);
  	release_region(dev->base_addr, LANCE_TOTAL_SIZE);
  	kfree(lp->tx_bounce_buffs);
  	kfree((void*)lp->rx_buffs);
  	kfree(lp);
  }
  
  void cleanup_module(void)
  {
  	int this_dev;
  
  	for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
  		struct net_device *dev = dev_lance[this_dev];
  		if (dev) {
  			unregister_netdev(dev);	
  			cleanup_card(dev);
  			free_netdev(dev);
  		}
  	}
  }
  #endif /* MODULE */
  MODULE_LICENSE("GPL");
  
  
  /* Starting in v2.1.*, the LANCE/PCnet probe is now similar to the other
     board probes now that kmalloc() can allocate ISA DMA-able regions.
     This also allows the LANCE driver to be used as a module.
     */
  static int __init do_lance_probe(struct net_device *dev)
  {
  	int *port, result;
  
  	if (high_memory <= phys_to_virt(16*1024*1024))
  		lance_need_isa_bounce_buffers = 0;
  
  	for (port = lance_portlist; *port; port++) {
  		int ioaddr = *port;
  		struct resource *r = request_region(ioaddr, LANCE_TOTAL_SIZE,
  							"lance-probe");
  
  		if (r) {
  			/* Detect the card with minimal I/O reads */
  			char offset14 = inb(ioaddr + 14);
  			int card;
  			for (card = 0; card < NUM_CARDS; ++card)
  				if (cards[card].id_offset14 == offset14)
  					break;
  			if (card < NUM_CARDS) {/*yes, the first byte matches*/
  				char offset15 = inb(ioaddr + 15);
  				for (card = 0; card < NUM_CARDS; ++card)
  					if ((cards[card].id_offset14 == offset14) &&
  						(cards[card].id_offset15 == offset15))
  						break;
  			}
  			if (card < NUM_CARDS) { /*Signature OK*/
  				result = lance_probe1(dev, ioaddr, 0, 0);
  				if (!result) {
  					struct lance_private *lp = dev->priv;
  					int ver = lp->chip_version;
  
  					r->name = chip_table[ver].name;
  					return 0;
  				}
  			}
  			release_region(ioaddr, LANCE_TOTAL_SIZE);
  		}
  	}
  	return -ENODEV;
  }
  
  #ifndef MODULE
  struct net_device * __init lance_probe(int unit)
  {
  	struct net_device *dev = alloc_etherdev(0);
  	int err;
  
  	if (!dev)
  		return ERR_PTR(-ENODEV);
  
  	sprintf(dev->name, "eth%d", unit);
  	netdev_boot_setup_check(dev);
  
  	err = do_lance_probe(dev);
  	if (err)
  		goto out;
  	return dev;
  out:
  	free_netdev(dev);
  	return ERR_PTR(err);
  }
  #endif
  
  static int __init lance_probe1(struct net_device *dev, int ioaddr, int irq, int options)
  {
  	struct lance_private *lp;
  	long dma_channels;			/* Mark spuriously-busy DMA channels */
  	int i, reset_val, lance_version;
  	const char *chipname;
  	/* Flags for specific chips or boards. */
  	unsigned char hpJ2405A = 0;		/* HP ISA adaptor */
  	int hp_builtin = 0;			/* HP on-board ethernet. */
  	static int did_version;			/* Already printed version info. */
  	unsigned long flags;
  	int err = -ENOMEM;
  
  	/* First we look for special cases.
  	   Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
  	   There are two HP versions, check the BIOS for the configuration port.
  	   This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
  	   */
  	if (isa_readw(0x000f0102) == 0x5048)  {
  		static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
  		int hp_port = (isa_readl(0x000f00f1) & 1)  ? 0x499 : 0x99;
  		/* We can have boards other than the built-in!  Verify this is on-board. */
  		if ((inb(hp_port) & 0xc0) == 0x80
  			&& ioaddr_table[inb(hp_port) & 3] == ioaddr)
  			hp_builtin = hp_port;
  	}
  	/* We also recognize the HP Vectra on-board here, but check below. */
  	hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
  				&& inb(ioaddr+2) == 0x09);
  
  	/* Reset the LANCE.	 */
  	reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
  
  	/* The Un-Reset needed is only needed for the real NE2100, and will
  	   confuse the HP board. */
  	if (!hpJ2405A)
  		outw(reset_val, ioaddr+LANCE_RESET);
  
  	outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
  	if (inw(ioaddr+LANCE_DATA) != 0x0004)
  		return -ENODEV;
  
  	/* Get the version of the chip. */
  	outw(88, ioaddr+LANCE_ADDR);
  	if (inw(ioaddr+LANCE_ADDR) != 88) {
  		lance_version = 0;
  	} else {			/* Good, it's a newer chip. */
  		int chip_version = inw(ioaddr+LANCE_DATA);
  		outw(89, ioaddr+LANCE_ADDR);
  		chip_version |= inw(ioaddr+LANCE_DATA) << 16;
  		if (lance_debug > 2)
  			printk("  LANCE chip version is %#x.\n", chip_version);
  		if ((chip_version & 0xfff) != 0x003)
  			return -ENODEV;
  		chip_version = (chip_version >> 12) & 0xffff;
  		for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
  			if (chip_table[lance_version].id_number == chip_version)
  				break;
  		}
  	}
  
  	/* We can't allocate dev->priv from alloc_etherdev() because it must
  	   a ISA DMA-able region. */
  	SET_MODULE_OWNER(dev);
  	chipname = chip_table[lance_version].name;
  	printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
  
  	/* There is a 16 byte station address PROM at the base address.
  	   The first six bytes are the station address. */
  	for (i = 0; i < 6; i++)
  		printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
  
  	dev->base_addr = ioaddr;
  	/* Make certain the data structures used by the LANCE are aligned and DMAble. */
  		
  	lp = kmalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
  	if(lp==NULL)
  		return -ENODEV;
  	if (lance_debug > 6) printk(" (#0x%05lx)", (unsigned long)lp);
  	memset(lp, 0, sizeof(*lp));
  	dev->priv = lp;
  	lp->name = chipname;
  	lp->rx_buffs = (unsigned long)kmalloc(PKT_BUF_SZ*RX_RING_SIZE,
  						  GFP_DMA | GFP_KERNEL);
  	if (!lp->rx_buffs)
  		goto out_lp;
  	if (lance_need_isa_bounce_buffers) {
  		lp->tx_bounce_buffs = kmalloc(PKT_BUF_SZ*TX_RING_SIZE,
  						  GFP_DMA | GFP_KERNEL);
  		if (!lp->tx_bounce_buffs)
  			goto out_rx;
  	} else
  		lp->tx_bounce_buffs = NULL;
  
  	lp->chip_version = lance_version;
  	spin_lock_init(&lp->devlock);
  
  	lp->init_block.mode = 0x0003;		/* Disable Rx and Tx. */
  	for (i = 0; i < 6; i++)
  		lp->init_block.phys_addr[i] = dev->dev_addr[i];
  	lp->init_block.filter[0] = 0x00000000;
  	lp->init_block.filter[1] = 0x00000000;
  	lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
  	lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
  
  	outw(0x0001, ioaddr+LANCE_ADDR);
  	inw(ioaddr+LANCE_ADDR);
  	outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
  	outw(0x0002, ioaddr+LANCE_ADDR);
  	inw(ioaddr+LANCE_ADDR);
  	outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
  	outw(0x0000, ioaddr+LANCE_ADDR);
  	inw(ioaddr+LANCE_ADDR);
  
  	if (irq) {					/* Set iff PCI card. */
  		dev->dma = 4;			/* Native bus-master, no DMA channel needed. */
  		dev->irq = irq;
  	} else if (hp_builtin) {
  		static const char dma_tbl[4] = {3, 5, 6, 0};
  		static const char irq_tbl[4] = {3, 4, 5, 9};
  		unsigned char port_val = inb(hp_builtin);
  		dev->dma = dma_tbl[(port_val >> 4) & 3];
  		dev->irq = irq_tbl[(port_val >> 2) & 3];
  		printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
  	} else if (hpJ2405A) {
  		static const char dma_tbl[4] = {3, 5, 6, 7};
  		static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
  		short reset_val = inw(ioaddr+LANCE_RESET);
  		dev->dma = dma_tbl[(reset_val >> 2) & 3];
  		dev->irq = irq_tbl[(reset_val >> 4) & 7];
  		printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
  	} else if (lance_version == PCNET_ISAP) {		/* The plug-n-play version. */
  		short bus_info;
  		outw(8, ioaddr+LANCE_ADDR);
  		bus_info = inw(ioaddr+LANCE_BUS_IF);
  		dev->dma = bus_info & 0x07;
  		dev->irq = (bus_info >> 4) & 0x0F;
  	} else {
  		/* The DMA channel may be passed in PARAM1. */
  		if (dev->mem_start & 0x07)
  			dev->dma = dev->mem_start & 0x07;
  	}
  
  	if (dev->dma == 0) {
  		/* Read the DMA channel status register, so that we can avoid
  		   stuck DMA channels in the DMA detection below. */
  		dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
  			(inb(DMA2_STAT_REG) & 0xf0);
  	}
  	err = -ENODEV;
  	if (dev->irq >= 2)
  		printk(" assigned IRQ %d", dev->irq);
  	else if (lance_version != 0)  {	/* 7990 boards need DMA detection first. */
  		unsigned long irq_mask;
  
  		/* To auto-IRQ we enable the initialization-done and DMA error
  		   interrupts. For ISA boards we get a DMA error, but VLB and PCI
  		   boards will work. */
  		irq_mask = probe_irq_on();
  
  		/* Trigger an initialization just for the interrupt. */
  		outw(0x0041, ioaddr+LANCE_DATA);
  
  		mdelay(20);
  		dev->irq = probe_irq_off(irq_mask);
  		if (dev->irq)
  			printk(", probed IRQ %d", dev->irq);
  		else {
  			printk(", failed to detect IRQ line.\n");
  			goto out_tx;
  		}
  
  		/* Check for the initialization done bit, 0x0100, which means
  		   that we don't need a DMA channel. */
  		if (inw(ioaddr+LANCE_DATA) & 0x0100)
  			dev->dma = 4;
  	}
  
  	if (dev->dma == 4) {
  		printk(", no DMA needed.\n");
  	} else if (dev->dma) {
  		if (request_dma(dev->dma, chipname)) {
  			printk("DMA %d allocation failed.\n", dev->dma);
  			goto out_tx;
  		} else
  			printk(", assigned DMA %d.\n", dev->dma);
  	} else {			/* OK, we have to auto-DMA. */
  		for (i = 0; i < 4; i++) {
  			static const char dmas[] = { 5, 6, 7, 3 };
  			int dma = dmas[i];
  			int boguscnt;
  
  			/* Don't enable a permanently busy DMA channel, or the machine
  			   will hang. */
  			if (test_bit(dma, &dma_channels))
  				continue;
  			outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
  			if (request_dma(dma, chipname))
  				continue;
  				
  			flags=claim_dma_lock();
  			set_dma_mode(dma, DMA_MODE_CASCADE);
  			enable_dma(dma);
  			release_dma_lock(flags);
  
  			/* Trigger an initialization. */
  			outw(0x0001, ioaddr+LANCE_DATA);
  			for (boguscnt = 100; boguscnt > 0; --boguscnt)
  				if (inw(ioaddr+LANCE_DATA) & 0x0900)
  					break;
  			if (inw(ioaddr+LANCE_DATA) & 0x0100) {
  				dev->dma = dma;
  				printk(", DMA %d.\n", dev->dma);
  				break;
  			} else {
  				flags=claim_dma_lock();
  				disable_dma(dma);
  				release_dma_lock(flags);
  				free_dma(dma);
  			}
  		}
  		if (i == 4) {			/* Failure: bail. */
  			printk("DMA detection failed.\n");
  			goto out_tx;
  		}
  	}
  
  	if (lance_version == 0 && dev->irq == 0) {
  		/* We may auto-IRQ now that we have a DMA channel. */
  		/* Trigger an initialization just for the interrupt. */
  		unsigned long irq_mask;
  
  		irq_mask = probe_irq_on();
  		outw(0x0041, ioaddr+LANCE_DATA);
  
  		mdelay(40);
  		dev->irq = probe_irq_off(irq_mask);
  		if (dev->irq == 0) {
  			printk("  Failed to detect the 7990 IRQ line.\n");
  			goto out_dma;
  		}
  		printk("  Auto-IRQ detected IRQ%d.\n", dev->irq);
  	}
  
  	if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
  		/* Turn on auto-select of media (10baseT or BNC) so that the user
  		   can watch the LEDs even if the board isn't opened. */
  		outw(0x0002, ioaddr+LANCE_ADDR);
  		/* Don't touch 10base2 power bit. */
  		outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
  	}
  
  	if (lance_debug > 0  &&  did_version++ == 0)
  		printk(version);
  
  	/* The LANCE-specific entries in the device structure. */
  	dev->open = lance_open;
  	dev->hard_start_xmit = lance_start_xmit;
  	dev->stop = lance_close;
  	dev->get_stats = lance_get_stats;
  	dev->set_multicast_list = set_multicast_list;
  	dev->tx_timeout = lance_tx_timeout;
  	dev->watchdog_timeo = TX_TIMEOUT;
  
  	err = register_netdev(dev);
  	if (err)
  		goto out_dma;
  	return 0;
  out_dma:
  	if (dev->dma != 4)
  		free_dma(dev->dma);
  out_tx:
  	kfree(lp->tx_bounce_buffs);
  out_rx:
  	kfree((void*)lp->rx_buffs);
  out_lp:
  	kfree(lp);
  	return err;
  }
  
  
  static int
  lance_open(struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  	int ioaddr = dev->base_addr;
  	int i;
  
  	if (dev->irq == 0 ||
  		request_irq(dev->irq, &lance_interrupt, 0, lp->name, dev)) {
  		return -EAGAIN;
  	}
  
  	/* We used to allocate DMA here, but that was silly.
  	   DMA lines can't be shared!  We now permanently allocate them. */
  
  	/* Reset the LANCE */
  	inw(ioaddr+LANCE_RESET);
  
  	/* The DMA controller is used as a no-operation slave, "cascade mode". */
  	if (dev->dma != 4) {
  		unsigned long flags=claim_dma_lock();
  		enable_dma(dev->dma);
  		set_dma_mode(dev->dma, DMA_MODE_CASCADE);
  		release_dma_lock(flags);
  	}
  
  	/* Un-Reset the LANCE, needed only for the NE2100. */
  	if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET)
  		outw(0, ioaddr+LANCE_RESET);
  
  	if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
  		/* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
  		outw(0x0002, ioaddr+LANCE_ADDR);
  		/* Only touch autoselect bit. */
  		outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
   	}
  
  	if (lance_debug > 1)
  		printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
  			   dev->name, dev->irq, dev->dma,
  		           (u32) isa_virt_to_bus(lp->tx_ring),
  		           (u32) isa_virt_to_bus(lp->rx_ring),
  			   (u32) isa_virt_to_bus(&lp->init_block));
  
  	lance_init_ring(dev, GFP_KERNEL);
  	/* Re-initialize the LANCE, and start it when done. */
  	outw(0x0001, ioaddr+LANCE_ADDR);
  	outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
  	outw(0x0002, ioaddr+LANCE_ADDR);
  	outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
  
  	outw(0x0004, ioaddr+LANCE_ADDR);
  	outw(0x0915, ioaddr+LANCE_DATA);
  
  	outw(0x0000, ioaddr+LANCE_ADDR);
  	outw(0x0001, ioaddr+LANCE_DATA);
  
  	netif_start_queue (dev);
  
  	i = 0;
  	while (i++ < 100)
  		if (inw(ioaddr+LANCE_DATA) & 0x0100)
  			break;
  	/* 
  	 * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
  	 * reports that doing so triggers a bug in the '974.
  	 */
   	outw(0x0042, ioaddr+LANCE_DATA);
  
  	if (lance_debug > 2)
  		printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
  			   dev->name, i, (u32) isa_virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA));
  
  	return 0;					/* Always succeed */
  }
  
  /* The LANCE has been halted for one reason or another (busmaster memory
     arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
     etc.).  Modern LANCE variants always reload their ring-buffer
     configuration when restarted, so we must reinitialize our ring
     context before restarting.  As part of this reinitialization,
     find all packets still on the Tx ring and pretend that they had been
     sent (in effect, drop the packets on the floor) - the higher-level
     protocols will time out and retransmit.  It'd be better to shuffle
     these skbs to a temp list and then actually re-Tx them after
     restarting the chip, but I'm too lazy to do so right now.  dplatt@3do.com
  */
  
  static void 
  lance_purge_ring(struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  	int i;
  
  	/* Free all the skbuffs in the Rx and Tx queues. */
  	for (i = 0; i < RX_RING_SIZE; i++) {
  		struct sk_buff *skb = lp->rx_skbuff[i];
  		lp->rx_skbuff[i] = NULL;
  		lp->rx_ring[i].base = 0;		/* Not owned by LANCE chip. */
  		if (skb)
  			dev_kfree_skb_any(skb);
  	}
  	for (i = 0; i < TX_RING_SIZE; i++) {
  		if (lp->tx_skbuff[i]) {
  			dev_kfree_skb_any(lp->tx_skbuff[i]);
  			lp->tx_skbuff[i] = NULL;
  		}
  	}
  }
  
  
  /* Initialize the LANCE Rx and Tx rings. */
  static void
  lance_init_ring(struct net_device *dev, gfp_t gfp)
  {
  	struct lance_private *lp = dev->priv;
  	int i;
  
  	lp->cur_rx = lp->cur_tx = 0;
  	lp->dirty_rx = lp->dirty_tx = 0;
  
  	for (i = 0; i < RX_RING_SIZE; i++) {
  		struct sk_buff *skb;
  		void *rx_buff;
  
  		skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
  		lp->rx_skbuff[i] = skb;
  		if (skb) {
  			skb->dev = dev;
  			rx_buff = skb->data;
  		} else
  			rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
  		if (rx_buff == NULL)
  			lp->rx_ring[i].base = 0;
  		else
  			lp->rx_ring[i].base = (u32)isa_virt_to_bus(rx_buff) | 0x80000000;
  		lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
  	}
  	/* The Tx buffer address is filled in as needed, but we do need to clear
  	   the upper ownership bit. */
  	for (i = 0; i < TX_RING_SIZE; i++) {
  		lp->tx_skbuff[i] = NULL;
  		lp->tx_ring[i].base = 0;
  	}
  
  	lp->init_block.mode = 0x0000;
  	for (i = 0; i < 6; i++)
  		lp->init_block.phys_addr[i] = dev->dev_addr[i];
  	lp->init_block.filter[0] = 0x00000000;
  	lp->init_block.filter[1] = 0x00000000;
  	lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
  	lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
  }
  
  static void
  lance_restart(struct net_device *dev, unsigned int csr0_bits, int must_reinit)
  {
  	struct lance_private *lp = dev->priv;
  
  	if (must_reinit ||
  		(chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) {
  		lance_purge_ring(dev);
  		lance_init_ring(dev, GFP_ATOMIC);
  	}
  	outw(0x0000,    dev->base_addr + LANCE_ADDR);
  	outw(csr0_bits, dev->base_addr + LANCE_DATA);
  }
  
  
  static void lance_tx_timeout (struct net_device *dev)
  {
  	struct lance_private *lp = (struct lance_private *) dev->priv;
  	int ioaddr = dev->base_addr;
  
  	outw (0, ioaddr + LANCE_ADDR);
  	printk ("%s: transmit timed out, status %4.4x, resetting.\n",
  		dev->name, inw (ioaddr + LANCE_DATA));
  	outw (0x0004, ioaddr + LANCE_DATA);
  	lp->stats.tx_errors++;
  #ifndef final_version
  	if (lance_debug > 3) {
  		int i;
  		printk (" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
  		  lp->dirty_tx, lp->cur_tx, netif_queue_stopped(dev) ? " (full)" : "",
  			lp->cur_rx);
  		for (i = 0; i < RX_RING_SIZE; i++)
  			printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
  			 lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
  				lp->rx_ring[i].msg_length);
  		for (i = 0; i < TX_RING_SIZE; i++)
  			printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
  			     lp->tx_ring[i].base, -lp->tx_ring[i].length,
  				lp->tx_ring[i].misc);
  		printk ("\n");
  	}
  #endif
  	lance_restart (dev, 0x0043, 1);
  
  	dev->trans_start = jiffies;
  	netif_wake_queue (dev);
  }
  
  
  static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  	int ioaddr = dev->base_addr;
  	int entry;
  	unsigned long flags;
  
  	spin_lock_irqsave(&lp->devlock, flags);
  
  	if (lance_debug > 3) {
  		outw(0x0000, ioaddr+LANCE_ADDR);
  		printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
  			   inw(ioaddr+LANCE_DATA));
  		outw(0x0000, ioaddr+LANCE_DATA);
  	}
  
  	/* Fill in a Tx ring entry */
  
  	/* Mask to ring buffer boundary. */
  	entry = lp->cur_tx & TX_RING_MOD_MASK;
  
  	/* Caution: the write order is important here, set the base address
  	   with the "ownership" bits last. */
  
  	/* The old LANCE chips doesn't automatically pad buffers to min. size. */
  	if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) {
  		if (skb->len < ETH_ZLEN) {
  			skb = skb_padto(skb, ETH_ZLEN);
  			if (skb == NULL)
  				goto out;
  			lp->tx_ring[entry].length = -ETH_ZLEN;
  		}
  		else 
  			lp->tx_ring[entry].length = -skb->len;
  	} else
  		lp->tx_ring[entry].length = -skb->len;
  
  	lp->tx_ring[entry].misc = 0x0000;
  
  	lp->stats.tx_bytes += skb->len;
  
  	/* If any part of this buffer is >16M we must copy it to a low-memory
  	   buffer. */
  	if ((u32)isa_virt_to_bus(skb->data) + skb->len > 0x01000000) {
  		if (lance_debug > 5)
  			printk("%s: bouncing a high-memory packet (%#x).\n",
  				   dev->name, (u32)isa_virt_to_bus(skb->data));
  		memcpy(&lp->tx_bounce_buffs[entry], skb->data, skb->len);
  		lp->tx_ring[entry].base =
  			((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000;
  		dev_kfree_skb(skb);
  	} else {
  		lp->tx_skbuff[entry] = skb;
  		lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000;
  	}
  	lp->cur_tx++;
  
  	/* Trigger an immediate send poll. */
  	outw(0x0000, ioaddr+LANCE_ADDR);
  	outw(0x0048, ioaddr+LANCE_DATA);
  
  	dev->trans_start = jiffies;
  
  	if ((lp->cur_tx - lp->dirty_tx) >= TX_RING_SIZE)
  		netif_stop_queue(dev);
  
  out:
  	spin_unlock_irqrestore(&lp->devlock, flags);
  	return 0;
  }
  
  /* The LANCE interrupt handler. */
  static irqreturn_t
  lance_interrupt(int irq, void *dev_id, struct pt_regs * regs)
  {
  	struct net_device *dev = dev_id;
  	struct lance_private *lp;
  	int csr0, ioaddr, boguscnt=10;
  	int must_restart;
  
  	if (dev == NULL) {
  		printk ("lance_interrupt(): irq %d for unknown device.\n", irq);
  		return IRQ_NONE;
  	}
  
  	ioaddr = dev->base_addr;
  	lp = dev->priv;
  	
  	spin_lock (&lp->devlock);
  
  	outw(0x00, dev->base_addr + LANCE_ADDR);
  	while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
  		   && --boguscnt >= 0) {
  		/* Acknowledge all of the current interrupt sources ASAP. */
  		outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
  
  		must_restart = 0;
  
  		if (lance_debug > 5)
  			printk("%s: interrupt  csr0=%#2.2x new csr=%#2.2x.\n",
  				   dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
  
  		if (csr0 & 0x0400)			/* Rx interrupt */
  			lance_rx(dev);
  
  		if (csr0 & 0x0200) {		/* Tx-done interrupt */
  			int dirty_tx = lp->dirty_tx;
  
  			while (dirty_tx < lp->cur_tx) {
  				int entry = dirty_tx & TX_RING_MOD_MASK;
  				int status = lp->tx_ring[entry].base;
  			
  				if (status < 0)
  					break;			/* It still hasn't been Txed */
  
  				lp->tx_ring[entry].base = 0;
  
  				if (status & 0x40000000) {
  					/* There was an major error, log it. */
  					int err_status = lp->tx_ring[entry].misc;
  					lp->stats.tx_errors++;
  					if (err_status & 0x0400) lp->stats.tx_aborted_errors++;
  					if (err_status & 0x0800) lp->stats.tx_carrier_errors++;
  					if (err_status & 0x1000) lp->stats.tx_window_errors++;
  					if (err_status & 0x4000) {
  						/* Ackk!  On FIFO errors the Tx unit is turned off! */
  						lp->stats.tx_fifo_errors++;
  						/* Remove this verbosity later! */
  						printk("%s: Tx FIFO error! Status %4.4x.\n",
  							   dev->name, csr0);
  						/* Restart the chip. */
  						must_restart = 1;
  					}
  				} else {
  					if (status & 0x18000000)
  						lp->stats.collisions++;
  					lp->stats.tx_packets++;
  				}
  
  				/* We must free the original skb if it's not a data-only copy
  				   in the bounce buffer. */
  				if (lp->tx_skbuff[entry]) {
  					dev_kfree_skb_irq(lp->tx_skbuff[entry]);
  					lp->tx_skbuff[entry] = NULL;
  				}
  				dirty_tx++;
  			}
  
  #ifndef final_version
  			if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
  				printk("out-of-sync dirty pointer, %d vs. %d, full=%s.\n",
  					   dirty_tx, lp->cur_tx,
  					   netif_queue_stopped(dev) ? "yes" : "no");
  				dirty_tx += TX_RING_SIZE;
  			}
  #endif
  
  			/* if the ring is no longer full, accept more packets */
  			if (netif_queue_stopped(dev) &&
  			    dirty_tx > lp->cur_tx - TX_RING_SIZE + 2)
  				netif_wake_queue (dev);
  
  			lp->dirty_tx = dirty_tx;
  		}
  
  		/* Log misc errors. */
  		if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
  		if (csr0 & 0x1000) lp->stats.rx_errors++; /* Missed a Rx frame. */
  		if (csr0 & 0x0800) {
  			printk("%s: Bus master arbitration failure, status %4.4x.\n",
  				   dev->name, csr0);
  			/* Restart the chip. */
  			must_restart = 1;
  		}
  
  		if (must_restart) {
  			/* stop the chip to clear the error condition, then restart */
  			outw(0x0000, dev->base_addr + LANCE_ADDR);
  			outw(0x0004, dev->base_addr + LANCE_DATA);
  			lance_restart(dev, 0x0002, 0);
  		}
  	}
  
  	/* Clear any other interrupt, and set interrupt enable. */
  	outw(0x0000, dev->base_addr + LANCE_ADDR);
  	outw(0x7940, dev->base_addr + LANCE_DATA);
  
  	if (lance_debug > 4)
  		printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
  			   dev->name, inw(ioaddr + LANCE_ADDR),
  			   inw(dev->base_addr + LANCE_DATA));
  
  	spin_unlock (&lp->devlock);
  	return IRQ_HANDLED;
  }
  
  static int
  lance_rx(struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  	int entry = lp->cur_rx & RX_RING_MOD_MASK;
  	int i;
  		
  	/* If we own the next entry, it's a new packet. Send it up. */
  	while (lp->rx_ring[entry].base >= 0) {
  		int status = lp->rx_ring[entry].base >> 24;
  
  		if (status != 0x03) {			/* There was an error. */
  			/* There is a tricky error noted by John Murphy,
  			   <murf@perftech.com> to Russ Nelson: Even with full-sized
  			   buffers it's possible for a jabber packet to use two
  			   buffers, with only the last correctly noting the error. */
  			if (status & 0x01)	/* Only count a general error at the */
  				lp->stats.rx_errors++; /* end of a packet.*/
  			if (status & 0x20) lp->stats.rx_frame_errors++;
  			if (status & 0x10) lp->stats.rx_over_errors++;
  			if (status & 0x08) lp->stats.rx_crc_errors++;
  			if (status & 0x04) lp->stats.rx_fifo_errors++;
  			lp->rx_ring[entry].base &= 0x03ffffff;
  		}
  		else 
  		{
  			/* Malloc up new buffer, compatible with net3. */
  			short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4;
  			struct sk_buff *skb;
  			
  			if(pkt_len<60)
  			{
  				printk("%s: Runt packet!\n",dev->name);
  				lp->stats.rx_errors++;
  			}
  			else
  			{
  				skb = dev_alloc_skb(pkt_len+2);
  				if (skb == NULL) 
  				{
  					printk("%s: Memory squeeze, deferring packet.\n", dev->name);
  					for (i=0; i < RX_RING_SIZE; i++)
  						if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
  							break;
  
  					if (i > RX_RING_SIZE -2) 
  					{
  						lp->stats.rx_dropped++;
  						lp->rx_ring[entry].base |= 0x80000000;
  						lp->cur_rx++;
  					}
  					break;
  				}
  				skb->dev = dev;
  				skb_reserve(skb,2);	/* 16 byte align */
  				skb_put(skb,pkt_len);	/* Make room */
  				eth_copy_and_sum(skb,
  					(unsigned char *)isa_bus_to_virt((lp->rx_ring[entry].base & 0x00ffffff)),
  					pkt_len,0);
  				skb->protocol=eth_type_trans(skb,dev);
  				netif_rx(skb);
  				dev->last_rx = jiffies;
  				lp->stats.rx_packets++;
  				lp->stats.rx_bytes+=pkt_len;
  			}
  		}
  		/* The docs say that the buffer length isn't touched, but Andrew Boyd
  		   of QNX reports that some revs of the 79C965 clear it. */
  		lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
  		lp->rx_ring[entry].base |= 0x80000000;
  		entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
  	}
  
  	/* We should check that at least two ring entries are free.	 If not,
  	   we should free one and mark stats->rx_dropped++. */
  
  	return 0;
  }
  
  static int
  lance_close(struct net_device *dev)
  {
  	int ioaddr = dev->base_addr;
  	struct lance_private *lp = dev->priv;
  
  	netif_stop_queue (dev);
  
  	if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
  		outw(112, ioaddr+LANCE_ADDR);
  		lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
  	}
  	outw(0, ioaddr+LANCE_ADDR);
  
  	if (lance_debug > 1)
  		printk("%s: Shutting down ethercard, status was %2.2x.\n",
  			   dev->name, inw(ioaddr+LANCE_DATA));
  
  	/* We stop the LANCE here -- it occasionally polls
  	   memory if we don't. */
  	outw(0x0004, ioaddr+LANCE_DATA);
  
  	if (dev->dma != 4)
  	{
  		unsigned long flags=claim_dma_lock();
  		disable_dma(dev->dma);
  		release_dma_lock(flags);
  	}
  	free_irq(dev->irq, dev);
  
  	lance_purge_ring(dev);
  
  	return 0;
  }
  
  static struct net_device_stats *lance_get_stats(struct net_device *dev)
  {
  	struct lance_private *lp = dev->priv;
  
  	if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
  		short ioaddr = dev->base_addr;
  		short saved_addr;
  		unsigned long flags;
  
  		spin_lock_irqsave(&lp->devlock, flags);
  		saved_addr = inw(ioaddr+LANCE_ADDR);
  		outw(112, ioaddr+LANCE_ADDR);
  		lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
  		outw(saved_addr, ioaddr+LANCE_ADDR);
  		spin_unlock_irqrestore(&lp->devlock, flags);
  	}
  
  	return &lp->stats;
  }
  
  /* Set or clear the multicast filter for this adaptor.
   */
  
  static void set_multicast_list(struct net_device *dev)
  {
  	short ioaddr = dev->base_addr;
  
  	outw(0, ioaddr+LANCE_ADDR);
  	outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance.	 */
  
  	if (dev->flags&IFF_PROMISC) {
  		/* Log any net taps. */
  		printk("%s: Promiscuous mode enabled.\n", dev->name);
  		outw(15, ioaddr+LANCE_ADDR);
  		outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
  	} else {
  		short multicast_table[4];
  		int i;
  		int num_addrs=dev->mc_count;
  		if(dev->flags&IFF_ALLMULTI)
  			num_addrs=1;
  		/* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
  		memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
  		for (i = 0; i < 4; i++) {
  			outw(8 + i, ioaddr+LANCE_ADDR);
  			outw(multicast_table[i], ioaddr+LANCE_DATA);
  		}
  		outw(15, ioaddr+LANCE_ADDR);
  		outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
  	}
  
  	lance_restart(dev, 0x0142, 0); /*  Resume normal operation */
  
  }
  
  