/*------------------------------------------------------------------------
   . smc9194.c
   . This is a driver for SMC's 9000 series of Ethernet cards.
   .
   . Copyright (C) 1996 by Erik Stahlman
   . This software may be used and distributed according to the terms
   . of the GNU General Public License, incorporated herein by reference.
   .
   . "Features" of the SMC chip:
   .   4608 byte packet memory. ( for the 91C92.  Others have more )
   .   EEPROM for configuration
   .   AUI/TP selection  ( mine has 10Base2/10BaseT select )
   .
   . Arguments:
   . 	io		 = for the base address
   .	irq	 = for the IRQ
   .	ifport = 0 for autodetect, 1 for TP, 2 for AUI ( or 10base2 )
   .
   . author:
   . 	Erik Stahlman				( erik@vt.edu )
   . contributors:
   .      Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   .
   . Hardware multicast code from Peter Cammaert ( pc@denkart.be )
   .
   . Sources:
   .    o   SMC databook
   .    o   skeleton.c by Donald Becker ( becker@scyld.com )
   .    o   ( a LOT of advice from Becker as well )
   .
   . History:
   .	12/07/95  Erik Stahlman  written, got receive/xmit handled
   . 	01/03/96  Erik Stahlman  worked out some bugs, actually usable!!! :-)
   .	01/06/96  Erik Stahlman	 cleaned up some, better testing, etc
   .	01/29/96  Erik Stahlman	 fixed autoirq, added multicast
   . 	02/01/96  Erik Stahlman	 1. disabled all interrupts in smc_reset
   .		   		 2. got rid of post-decrementing bug -- UGH.
   .	02/13/96  Erik Stahlman  Tried to fix autoirq failure.  Added more
   .				 descriptive error messages.
   .	02/15/96  Erik Stahlman  Fixed typo that caused detection failure
   . 	02/23/96  Erik Stahlman	 Modified it to fit into kernel tree
   .				 Added support to change hardware address
   .				 Cleared stats on opens
   .	02/26/96  Erik Stahlman	 Trial support for Kernel 1.2.13
   .				 Kludge for automatic IRQ detection
   .	03/04/96  Erik Stahlman	 Fixed kernel 1.3.70 +
   .				 Fixed bug reported by Gardner Buchanan in
   .				   smc_enable, with outw instead of outb
   .	03/06/96  Erik Stahlman  Added hardware multicast from Peter Cammaert
   .	04/14/00  Heiko Pruessing (SMA Regelsysteme)  Fixed bug in chip memory
   .				 allocation
   .      08/20/00  Arnaldo Melo   fix kfree(skb) in smc_hardware_send_packet
   .      12/15/00  Christian Jullien fix "Warning: kfree_skb on hard IRQ"
   .      11/08/01 Matt Domsch     Use common crc32 function
   ----------------------------------------------------------------------------*/
  
  static const char version[] =
  	"smc9194.c:v0.14 12/15/00 by Erik Stahlman (erik@vt.edu)";
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/fcntl.h>
  #include <linux/interrupt.h>
  #include <linux/ioport.h>
  #include <linux/in.h>
  #include <linux/string.h>
  #include <linux/init.h>
  #include <linux/crc32.h>
  #include <linux/errno.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/bitops.h>
  
  #include <asm/io.h>
  
  #include "smc9194.h"
  
  #define DRV_NAME "smc9194"
  
  /*------------------------------------------------------------------------
   .
   . Configuration options, for the experienced user to change.
   .
   -------------------------------------------------------------------------*/
  
  /*
   . Do you want to use 32 bit xfers?  This should work on all chips, as
   . the chipset is designed to accommodate them.
  */
  #ifdef __sh__
  #undef USE_32_BIT
  #else
  #define USE_32_BIT 1
  #endif
  
  /*
   .the SMC9194 can be at any of the following port addresses.  To change,
   .for a slightly different card, you can add it to the array.  Keep in
   .mind that the array must end in zero.
  */
  
  struct devlist {
  	unsigned int port;
  	unsigned int irq;
  };
  
  static struct devlist smc_devlist[] __initdata = {
  	{.port = 0x200, .irq = 0},
  	{.port = 0x220, .irq = 0},
  	{.port = 0x240, .irq = 0},
  	{.port = 0x260, .irq = 0},
  	{.port = 0x280, .irq = 0},
  	{.port = 0x2A0, .irq = 0},
  	{.port = 0x2C0, .irq = 0},
  	{.port = 0x2E0, .irq = 0},
  	{.port = 0x300, .irq = 0},
  	{.port = 0x320, .irq = 0},
  	{.port = 0x340, .irq = 0},
  	{.port = 0x360, .irq = 0},
  	{.port = 0x380, .irq = 0},
  	{.port = 0x3A0, .irq = 0},
  	{.port = 0x3C0, .irq = 0},
  	{.port = 0x3E0, .irq = 0},
  	{.port = 0,     .irq = 0},
  };
  /*
   . Wait time for memory to be free.  This probably shouldn't be
   . tuned that much, as waiting for this means nothing else happens
   . in the system
  */
  #define MEMORY_WAIT_TIME 16
  
  /*
   . DEBUGGING LEVELS
   .
   . 0 for normal operation
   . 1 for slightly more details
   . >2 for various levels of increasingly useless information
   .    2 for interrupt tracking, status flags
   .    3 for packet dumps, etc.
  */
  #define SMC_DEBUG 0
  
  #if (SMC_DEBUG > 2 )
  #define PRINTK3(x) printk x
  #else
  #define PRINTK3(x)
  #endif
  
  #if SMC_DEBUG > 1
  #define PRINTK2(x) printk x
  #else
  #define PRINTK2(x)
  #endif
  
  #ifdef SMC_DEBUG
  #define PRINTK(x) printk x
  #else
  #define PRINTK(x)
  #endif
  
  
  /*------------------------------------------------------------------------
   .
   . The internal workings of the driver.  If you are changing anything
   . here with the SMC stuff, you should have the datasheet and known
   . what you are doing.
   .
   -------------------------------------------------------------------------*/
  #define CARDNAME "SMC9194"
  
  
  /* store this information for the driver.. */
  struct smc_local {
  	/*
  	   If I have to wait until memory is available to send
  	   a packet, I will store the skbuff here, until I get the
  	   desired memory.  Then, I'll send it out and free it.
  	*/
  	struct sk_buff * saved_skb;
  
  	/*
   	 . This keeps track of how many packets that I have
   	 . sent out.  When an TX_EMPTY interrupt comes, I know
  	 . that all of these have been sent.
  	*/
  	int	packets_waiting;
  };
  
  
  /*-----------------------------------------------------------------
   .
   .  The driver can be entered at any of the following entry points.
   .
   .------------------------------------------------------------------  */
  
  /*
   . This is called by  register_netdev().  It is responsible for
   . checking the portlist for the SMC9000 series chipset.  If it finds
   . one, then it will initialize the device, find the hardware information,
   . and sets up the appropriate device parameters.
   . NOTE: Interrupts are *OFF* when this procedure is called.
   .
   . NB:This shouldn't be static since it is referred to externally.
  */
  struct net_device *smc_init(int unit);
  
  /*
   . The kernel calls this function when someone wants to use the device,
   . typically 'ifconfig ethX up'.
  */
  static int smc_open(struct net_device *dev);
  
  /*
   . Our watchdog timed out. Called by the networking layer
  */
  static void smc_timeout(struct net_device *dev);
  
  /*
   . This is called by the kernel in response to 'ifconfig ethX down'.  It
   . is responsible for cleaning up everything that the open routine
   . does, and maybe putting the card into a powerdown state.
  */
  static int smc_close(struct net_device *dev);
  
  /*
   . Finally, a call to set promiscuous mode ( for TCPDUMP and related
   . programs ) and multicast modes.
  */
  static void smc_set_multicast_list(struct net_device *dev);
  
  
  /*---------------------------------------------------------------
   .
   . Interrupt level calls..
   .
   ----------------------------------------------------------------*/
  
  /*
   . Handles the actual interrupt
  */
  static irqreturn_t smc_interrupt(int irq, void *);
  /*
   . This is a separate procedure to handle the receipt of a packet, to
   . leave the interrupt code looking slightly cleaner
  */
  static inline void smc_rcv( struct net_device *dev );
  /*
   . This handles a TX interrupt, which is only called when an error
   . relating to a packet is sent.
  */
  static inline void smc_tx( struct net_device * dev );
  
  /*
   ------------------------------------------------------------
   .
   . Internal routines
   .
   ------------------------------------------------------------
  */
  
  /*
   . Test if a given location contains a chip, trying to cause as
   . little damage as possible if it's not a SMC chip.
  */
  static int smc_probe(struct net_device *dev, int ioaddr);
  
  /*
   . A rather simple routine to print out a packet for debugging purposes.
  */
  #if SMC_DEBUG > 2
  static void print_packet( byte *, int );
  #endif
  
  #define tx_done(dev) 1
  
  /* this is called to actually send the packet to the chip */
  static void smc_hardware_send_packet( struct net_device * dev );
  
  /* Since I am not sure if I will have enough room in the chip's ram
   . to store the packet, I call this routine, which either sends it
   . now, or generates an interrupt when the card is ready for the
   . packet */
  static netdev_tx_t  smc_wait_to_send_packet( struct sk_buff * skb,
  					     struct net_device *dev );
  
  /* this does a soft reset on the device */
  static void smc_reset( int ioaddr );
  
  /* Enable Interrupts, Receive, and Transmit */
  static void smc_enable( int ioaddr );
  
  /* this puts the device in an inactive state */
  static void smc_shutdown( int ioaddr );
  
  /* This routine will find the IRQ of the driver if one is not
   . specified in the input to the device.  */
  static int smc_findirq( int ioaddr );
  
  /*
   . Function: smc_reset( int ioaddr )
   . Purpose:
   .  	This sets the SMC91xx chip to its normal state, hopefully from whatever
   . 	mess that any other DOS driver has put it in.
   .
   . Maybe I should reset more registers to defaults in here?  SOFTRESET  should
   . do that for me.
   .
   . Method:
   .	1.  send a SOFT RESET
   .	2.  wait for it to finish
   .	3.  enable autorelease mode
   .	4.  reset the memory management unit
   .	5.  clear all interrupts
   .
  */
  static void smc_reset( int ioaddr )
  {
  	/* This resets the registers mostly to defaults, but doesn't
  	   affect EEPROM.  That seems unnecessary */
  	SMC_SELECT_BANK( 0 );
  	outw( RCR_SOFTRESET, ioaddr + RCR );
  
  	/* this should pause enough for the chip to be happy */
  	SMC_DELAY( );
  
  	/* Set the transmit and receive configuration registers to
  	   default values */
  	outw( RCR_CLEAR, ioaddr + RCR );
  	outw( TCR_CLEAR, ioaddr + TCR );
  
  	/* set the control register to automatically
  	   release successfully transmitted packets, to make the best
  	   use out of our limited memory */
  	SMC_SELECT_BANK( 1 );
  	outw( inw( ioaddr + CONTROL ) | CTL_AUTO_RELEASE , ioaddr + CONTROL );
  
  	/* Reset the MMU */
  	SMC_SELECT_BANK( 2 );
  	outw( MC_RESET, ioaddr + MMU_CMD );
  
  	/* Note:  It doesn't seem that waiting for the MMU busy is needed here,
  	   but this is a place where future chipsets _COULD_ break.  Be wary
   	   of issuing another MMU command right after this */
  
  	outb( 0, ioaddr + INT_MASK );
  }
  
  /*
   . Function: smc_enable
   . Purpose: let the chip talk to the outside work
   . Method:
   .	1.  Enable the transmitter
   .	2.  Enable the receiver
   .	3.  Enable interrupts
  */
  static void smc_enable( int ioaddr )
  {
  	SMC_SELECT_BANK( 0 );
  	/* see the header file for options in TCR/RCR NORMAL*/
  	outw( TCR_NORMAL, ioaddr + TCR );
  	outw( RCR_NORMAL, ioaddr + RCR );
  
  	/* now, enable interrupts */
  	SMC_SELECT_BANK( 2 );
  	outb( SMC_INTERRUPT_MASK, ioaddr + INT_MASK );
  }
  
  /*
   . Function: smc_shutdown
   . Purpose:  closes down the SMC91xxx chip.
   . Method:
   .	1. zero the interrupt mask
   .	2. clear the enable receive flag
   .	3. clear the enable xmit flags
   .
   . TODO:
   .   (1) maybe utilize power down mode.
   .	Why not yet?  Because while the chip will go into power down mode,
   .	the manual says that it will wake up in response to any I/O requests
   .	in the register space.   Empirical results do not show this working.
  */
  static void smc_shutdown( int ioaddr )
  {
  	/* no more interrupts for me */
  	SMC_SELECT_BANK( 2 );
  	outb( 0, ioaddr + INT_MASK );
  
  	/* and tell the card to stay away from that nasty outside world */
  	SMC_SELECT_BANK( 0 );
  	outb( RCR_CLEAR, ioaddr + RCR );
  	outb( TCR_CLEAR, ioaddr + TCR );
  #if 0
  	/* finally, shut the chip down */
  	SMC_SELECT_BANK( 1 );
  	outw( inw( ioaddr + CONTROL ), CTL_POWERDOWN, ioaddr + CONTROL  );
  #endif
  }
  
  
  /*
   . Function: smc_setmulticast( int ioaddr, struct net_device *dev )
   . Purpose:
   .    This sets the internal hardware table to filter out unwanted multicast
   .    packets before they take up memory.
   .
   .    The SMC chip uses a hash table where the high 6 bits of the CRC of
   .    address are the offset into the table.  If that bit is 1, then the
   .    multicast packet is accepted.  Otherwise, it's dropped silently.
   .
   .    To use the 6 bits as an offset into the table, the high 3 bits are the
   .    number of the 8 bit register, while the low 3 bits are the bit within
   .    that register.
   .
   . This routine is based very heavily on the one provided by Peter Cammaert.
  */
  
  
  static void smc_setmulticast(int ioaddr, struct net_device *dev)
  {
  	int			i;
  	unsigned char		multicast_table[ 8 ];
  	struct netdev_hw_addr *ha;
  	/* table for flipping the order of 3 bits */
  	unsigned char invert3[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
  
  	/* start with a table of all zeros: reject all */
  	memset( multicast_table, 0, sizeof( multicast_table ) );
  
  	netdev_for_each_mc_addr(ha, dev) {
  		int position;
  
  		/* only use the low order bits */
  		position = ether_crc_le(6, ha->addr) & 0x3f;
  
  		/* do some messy swapping to put the bit in the right spot */
  		multicast_table[invert3[position&7]] |=
  					(1<<invert3[(position>>3)&7]);
  
  	}
  	/* now, the table can be loaded into the chipset */
  	SMC_SELECT_BANK( 3 );
  
  	for ( i = 0; i < 8 ; i++ ) {
  		outb( multicast_table[i], ioaddr + MULTICAST1 + i );
  	}
  }
  
  /*
   . Function: smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * )
   . Purpose:
   .    Attempt to allocate memory for a packet, if chip-memory is not
   .    available, then tell the card to generate an interrupt when it
   .    is available.
   .
   . Algorithm:
   .
   . o	if the saved_skb is not currently null, then drop this packet
   .	on the floor.  This should never happen, because of TBUSY.
   . o	if the saved_skb is null, then replace it with the current packet,
   . o	See if I can sending it now.
   . o 	(NO): Enable interrupts and let the interrupt handler deal with it.
   . o	(YES):Send it now.
  */
  static netdev_tx_t smc_wait_to_send_packet(struct sk_buff *skb,
  					   struct net_device *dev)
  {
  	struct smc_local *lp = netdev_priv(dev);
  	unsigned int ioaddr 	= dev->base_addr;
  	word 			length;
  	unsigned short 		numPages;
  	word			time_out;
  
  	netif_stop_queue(dev);
  	/* Well, I want to send the packet.. but I don't know
  	   if I can send it right now...  */
  
  	if ( lp->saved_skb) {
  		/* THIS SHOULD NEVER HAPPEN. */
  		dev->stats.tx_aborted_errors++;
  		printk(CARDNAME": Bad Craziness - sent packet while busy.
  " );
  		return NETDEV_TX_BUSY;
  	}
  	lp->saved_skb = skb;
  
  	length = skb->len;
  
  	if (length < ETH_ZLEN) {
  		if (skb_padto(skb, ETH_ZLEN)) {
  			netif_wake_queue(dev);
  			return NETDEV_TX_OK;
  		}
  		length = ETH_ZLEN;
  	}
  
  	/*
  	** The MMU wants the number of pages to be the number of 256 bytes
  	** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
  	**
  	** Pkt size for allocating is data length +6 (for additional status words,
  	** length and ctl!) If odd size last byte is included in this header.
  	*/
  	numPages =  ((length & 0xfffe) + 6) / 256;
  
  	if (numPages > 7 ) {
  		printk(CARDNAME": Far too big packet error.
  ");
  		/* freeing the packet is a good thing here... but should
  		 . any packets of this size get down here?   */
  		dev_kfree_skb (skb);
  		lp->saved_skb = NULL;
  		/* this IS an error, but, i don't want the skb saved */
  		netif_wake_queue(dev);
  		return NETDEV_TX_OK;
  	}
  	/* either way, a packet is waiting now */
  	lp->packets_waiting++;
  
  	/* now, try to allocate the memory */
  	SMC_SELECT_BANK( 2 );
  	outw( MC_ALLOC | numPages, ioaddr + MMU_CMD );
  	/*
   	. Performance Hack
  	.
   	. wait a short amount of time.. if I can send a packet now, I send
  	. it now.  Otherwise, I enable an interrupt and wait for one to be
  	. available.
  	.
  	. I could have handled this a slightly different way, by checking to
  	. see if any memory was available in the FREE MEMORY register.  However,
  	. either way, I need to generate an allocation, and the allocation works
  	. no matter what, so I saw no point in checking free memory.
  	*/
  	time_out = MEMORY_WAIT_TIME;
  	do {
  		word	status;
  
  		status = inb( ioaddr + INTERRUPT );
  		if ( status & IM_ALLOC_INT ) {
  			/* acknowledge the interrupt */
  			outb( IM_ALLOC_INT, ioaddr + INTERRUPT );
    			break;
  		}
     	} while ( -- time_out );
  
     	if ( !time_out ) {
  		/* oh well, wait until the chip finds memory later */
  		SMC_ENABLE_INT( IM_ALLOC_INT );
  		PRINTK2((CARDNAME": memory allocation deferred.
  "));
  		/* it's deferred, but I'll handle it later */
  		return NETDEV_TX_OK;
     	}
  	/* or YES! I can send the packet now.. */
  	smc_hardware_send_packet(dev);
  	netif_wake_queue(dev);
  	return NETDEV_TX_OK;
  }
  
  /*
   . Function:  smc_hardware_send_packet(struct net_device * )
   . Purpose:
   .	This sends the actual packet to the SMC9xxx chip.
   .
   . Algorithm:
   . 	First, see if a saved_skb is available.
   .		( this should NOT be called if there is no 'saved_skb'
   .	Now, find the packet number that the chip allocated
   .	Point the data pointers at it in memory
   .	Set the length word in the chip's memory
   .	Dump the packet to chip memory
   .	Check if a last byte is needed ( odd length packet )
   .		if so, set the control flag right
   . 	Tell the card to send it
   .	Enable the transmit interrupt, so I know if it failed
   . 	Free the kernel data if I actually sent it.
  */
  static void smc_hardware_send_packet( struct net_device * dev )
  {
  	struct smc_local *lp = netdev_priv(dev);
  	byte	 		packet_no;
  	struct sk_buff * 	skb = lp->saved_skb;
  	word			length;
  	unsigned int		ioaddr;
  	byte			* buf;
  
  	ioaddr = dev->base_addr;
  
  	if ( !skb ) {
  		PRINTK((CARDNAME": In XMIT with no packet to send
  "));
  		return;
  	}
  	length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
  	buf = skb->data;
  
  	/* If I get here, I _know_ there is a packet slot waiting for me */
  	packet_no = inb( ioaddr + PNR_ARR + 1 );
  	if ( packet_no & 0x80 ) {
  		/* or isn't there?  BAD CHIP! */
  		netdev_dbg(dev, CARDNAME": Memory allocation failed.
  ");
  		dev_kfree_skb_any(skb);
  		lp->saved_skb = NULL;
  		netif_wake_queue(dev);
  		return;
  	}
  
  	/* we have a packet address, so tell the card to use it */
  	outb( packet_no, ioaddr + PNR_ARR );
  
  	/* point to the beginning of the packet */
  	outw( PTR_AUTOINC , ioaddr + POINTER );
  
  	PRINTK3((CARDNAME": Trying to xmit packet of length %x
  ", length));
  #if SMC_DEBUG > 2
  	print_packet( buf, length );
  #endif
  
  	/* send the packet length ( +6 for status, length and ctl byte )
   	   and the status word ( set to zeros ) */
  #ifdef USE_32_BIT
  	outl(  (length +6 ) << 16 , ioaddr + DATA_1 );
  #else
  	outw( 0, ioaddr + DATA_1 );
  	/* send the packet length ( +6 for status words, length, and ctl*/
  	outb( (length+6) & 0xFF,ioaddr + DATA_1 );
  	outb( (length+6) >> 8 , ioaddr + DATA_1 );
  #endif
  
  	/* send the actual data
  	 . I _think_ it's faster to send the longs first, and then
  	 . mop up by sending the last word.  It depends heavily
   	 . on alignment, at least on the 486.  Maybe it would be
   	 . a good idea to check which is optimal?  But that could take
  	 . almost as much time as is saved?
  	*/
  #ifdef USE_32_BIT
  	if ( length & 0x2  ) {
  		outsl(ioaddr + DATA_1, buf,  length >> 2 );
  		outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
  	}
  	else
  		outsl(ioaddr + DATA_1, buf,  length >> 2 );
  #else
  	outsw(ioaddr + DATA_1 , buf, (length ) >> 1);
  #endif
  	/* Send the last byte, if there is one.   */
  
  	if ( (length & 1) == 0 ) {
  		outw( 0, ioaddr + DATA_1 );
  	} else {
  		outb( buf[length -1 ], ioaddr + DATA_1 );
  		outb( 0x20, ioaddr + DATA_1);
  	}
  
  	/* enable the interrupts */
  	SMC_ENABLE_INT( (IM_TX_INT | IM_TX_EMPTY_INT) );
  
  	/* and let the chipset deal with it */
  	outw( MC_ENQUEUE , ioaddr + MMU_CMD );
  
  	PRINTK2((CARDNAME": Sent packet of length %d
  ", length));
  
  	lp->saved_skb = NULL;
  	dev_kfree_skb_any (skb);
  
  	dev->trans_start = jiffies;
  
  	/* we can send another packet */
  	netif_wake_queue(dev);
  }
  
  /*-------------------------------------------------------------------------
   |
   | smc_init(int unit)
   |   Input parameters:
   |	dev->base_addr == 0, try to find all possible locations
   |	dev->base_addr == 1, return failure code
   |	dev->base_addr == 2, always allocate space,  and return success
   |	dev->base_addr == <anything else>   this is the address to check
   |
   |   Output:
   |	pointer to net_device or ERR_PTR(error)
   |
   ---------------------------------------------------------------------------
  */
  static int io;
  static int irq;
  static int ifport;
  
  struct net_device * __init smc_init(int unit)
  {
  	struct net_device *dev = alloc_etherdev(sizeof(struct smc_local));
  	struct devlist *smcdev = smc_devlist;
  	int err = 0;
  
  	if (!dev)
  		return ERR_PTR(-ENODEV);
  
  	if (unit >= 0) {
  		sprintf(dev->name, "eth%d", unit);
  		netdev_boot_setup_check(dev);
  		io = dev->base_addr;
  		irq = dev->irq;
  	}
  
  	if (io > 0x1ff) {	/* Check a single specified location. */
  		err = smc_probe(dev, io);
  	} else if (io != 0) {	/* Don't probe at all. */
  		err = -ENXIO;
  	} else {
  		for (;smcdev->port; smcdev++) {
  			if (smc_probe(dev, smcdev->port) == 0)
  				break;
  		}
  		if (!smcdev->port)
  			err = -ENODEV;
  	}
  	if (err)
  		goto out;
  	err = register_netdev(dev);
  	if (err)
  		goto out1;
  	return dev;
  out1:
  	free_irq(dev->irq, dev);
  	release_region(dev->base_addr, SMC_IO_EXTENT);
  out:
  	free_netdev(dev);
  	return ERR_PTR(err);
  }
  
  /*----------------------------------------------------------------------
   . smc_findirq
   .
   . This routine has a simple purpose -- make the SMC chip generate an
   . interrupt, so an auto-detect routine can detect it, and find the IRQ,
   ------------------------------------------------------------------------
  */
  static int __init smc_findirq(int ioaddr)
  {
  #ifndef NO_AUTOPROBE
  	int	timeout = 20;
  	unsigned long cookie;
  
  
  	cookie = probe_irq_on();
  
  	/*
  	 * What I try to do here is trigger an ALLOC_INT. This is done
  	 * by allocating a small chunk of memory, which will give an interrupt
  	 * when done.
  	 */
  
  
  	SMC_SELECT_BANK(2);
  	/* enable ALLOCation interrupts ONLY */
  	outb( IM_ALLOC_INT, ioaddr + INT_MASK );
  
  	/*
   	 . Allocate 512 bytes of memory.  Note that the chip was just
  	 . reset so all the memory is available
  	*/
  	outw( MC_ALLOC | 1, ioaddr + MMU_CMD );
  
  	/*
  	 . Wait until positive that the interrupt has been generated
  	*/
  	while ( timeout ) {
  		byte	int_status;
  
  		int_status = inb( ioaddr + INTERRUPT );
  
  		if ( int_status & IM_ALLOC_INT )
  			break;		/* got the interrupt */
  		timeout--;
  	}
  	/* there is really nothing that I can do here if timeout fails,
  	   as probe_irq_off will return a 0 anyway, which is what I
  	   want in this case.   Plus, the clean up is needed in both
  	   cases.  */
  
  	/* DELAY HERE!
  	   On a fast machine, the status might change before the interrupt
  	   is given to the processor.  This means that the interrupt was
  	   never detected, and probe_irq_off fails to report anything.
  	   This should fix probe_irq_* problems.
  	*/
  	SMC_DELAY();
  	SMC_DELAY();
  
  	/* and disable all interrupts again */
  	outb( 0, ioaddr + INT_MASK );
  
  	/* and return what I found */
  	return probe_irq_off(cookie);
  #else /* NO_AUTOPROBE */
  	struct devlist *smcdev;
  	for (smcdev = smc_devlist; smcdev->port; smcdev++) {
  		if (smcdev->port == ioaddr)
  			return smcdev->irq;
  	}
  	return 0;
  #endif
  }
  
  static const struct net_device_ops smc_netdev_ops = {
  	.ndo_open		 = smc_open,
  	.ndo_stop		= smc_close,
  	.ndo_start_xmit    	= smc_wait_to_send_packet,
  	.ndo_tx_timeout	    	= smc_timeout,
  	.ndo_set_rx_mode	= smc_set_multicast_list,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_set_mac_address 	= eth_mac_addr,
  	.ndo_validate_addr	= eth_validate_addr,
  };
  
  /*----------------------------------------------------------------------
   . Function: smc_probe( int ioaddr )
   .
   . Purpose:
   .	Tests to see if a given ioaddr points to an SMC9xxx chip.
   .	Returns a 0 on success
   .
   . Algorithm:
   .	(1) see if the high byte of BANK_SELECT is 0x33
   . 	(2) compare the ioaddr with the base register's address
   .	(3) see if I recognize the chip ID in the appropriate register
   .
   .---------------------------------------------------------------------
   */
  
  /*---------------------------------------------------------------
   . Here I do typical initialization tasks.
   .
   . o  Initialize the structure if needed
   . o  print out my vanity message if not done so already
   . o  print out what type of hardware is detected
   . o  print out the ethernet address
   . o  find the IRQ
   . o  set up my private data
   . o  configure the dev structure with my subroutines
   . o  actually GRAB the irq.
   . o  GRAB the region
   .-----------------------------------------------------------------
  */
  static int __init smc_probe(struct net_device *dev, int ioaddr)
  {
  	int i, memory, retval;
  	unsigned int bank;
  
  	const char *version_string;
  	const char *if_string;
  
  	/* registers */
  	word revision_register;
  	word base_address_register;
  	word configuration_register;
  	word memory_info_register;
  	word memory_cfg_register;
  
  	/* Grab the region so that no one else tries to probe our ioports. */
  	if (!request_region(ioaddr, SMC_IO_EXTENT, DRV_NAME))
  		return -EBUSY;
  
  	dev->irq = irq;
  	dev->if_port = ifport;
  
  	/* First, see if the high byte is 0x33 */
  	bank = inw( ioaddr + BANK_SELECT );
  	if ( (bank & 0xFF00) != 0x3300 ) {
  		retval = -ENODEV;
  		goto err_out;
  	}
  	/* The above MIGHT indicate a device, but I need to write to further
   	 	test this.  */
  	outw( 0x0, ioaddr + BANK_SELECT );
  	bank = inw( ioaddr + BANK_SELECT );
  	if ( (bank & 0xFF00 ) != 0x3300 ) {
  		retval = -ENODEV;
  		goto err_out;
  	}
  	/* well, we've already written once, so hopefully another time won't
   	   hurt.  This time, I need to switch the bank register to bank 1,
  	   so I can access the base address register */
  	SMC_SELECT_BANK(1);
  	base_address_register = inw( ioaddr + BASE );
  	if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) )  {
  		printk(CARDNAME ": IOADDR %x doesn't match configuration (%x). "
  			"Probably not a SMC chip
  ",
  			ioaddr, base_address_register >> 3 & 0x3E0 );
  		/* well, the base address register didn't match.  Must not have
  		   been a SMC chip after all. */
  		retval = -ENODEV;
  		goto err_out;
  	}
  
  	/*  check if the revision register is something that I recognize.
  	    These might need to be added to later, as future revisions
  	    could be added.  */
  	SMC_SELECT_BANK(3);
  	revision_register  = inw( ioaddr + REVISION );
  	if ( !chip_ids[ ( revision_register  >> 4 ) & 0xF  ] ) {
  		/* I don't recognize this chip, so... */
  		printk(CARDNAME ": IO %x: Unrecognized revision register:"
  			" %x, Contact author.
  ", ioaddr, revision_register);
  
  		retval = -ENODEV;
  		goto err_out;
  	}
  
  	/* at this point I'll assume that the chip is an SMC9xxx.
  	   It might be prudent to check a listing of MAC addresses
  	   against the hardware address, or do some other tests. */
  
  	pr_info_once("%s
  ", version);
  
  	/* fill in some of the fields */
  	dev->base_addr = ioaddr;
  
  	/*
   	 . Get the MAC address ( bank 1, regs 4 - 9 )
  	*/
  	SMC_SELECT_BANK( 1 );
  	for ( i = 0; i < 6; i += 2 ) {
  		word	address;
  
  		address = inw( ioaddr + ADDR0 + i  );
  		dev->dev_addr[ i + 1] = address >> 8;
  		dev->dev_addr[ i ] = address & 0xFF;
  	}
  
  	/* get the memory information */
  
  	SMC_SELECT_BANK( 0 );
  	memory_info_register = inw( ioaddr + MIR );
  	memory_cfg_register  = inw( ioaddr + MCR );
  	memory = ( memory_cfg_register >> 9 )  & 0x7;  /* multiplier */
  	memory *= 256 * ( memory_info_register & 0xFF );
  
  	/*
  	 Now, I want to find out more about the chip.  This is sort of
   	 redundant, but it's cleaner to have it in both, rather than having
   	 one VERY long probe procedure.
  	*/
  	SMC_SELECT_BANK(3);
  	revision_register  = inw( ioaddr + REVISION );
  	version_string = chip_ids[ ( revision_register  >> 4 ) & 0xF  ];
  	if ( !version_string ) {
  		/* I shouldn't get here because this call was done before.... */
  		retval = -ENODEV;
  		goto err_out;
  	}
  
  	/* is it using AUI or 10BaseT ? */
  	if ( dev->if_port == 0 ) {
  		SMC_SELECT_BANK(1);
  		configuration_register = inw( ioaddr + CONFIG );
  		if ( configuration_register & CFG_AUI_SELECT )
  			dev->if_port = 2;
  		else
  			dev->if_port = 1;
  	}
  	if_string = interfaces[ dev->if_port - 1 ];
  
  	/* now, reset the chip, and put it into a known state */
  	smc_reset( ioaddr );
  
  	/*
  	 . If dev->irq is 0, then the device has to be banged on to see
  	 . what the IRQ is.
   	 .
  	 . This banging doesn't always detect the IRQ, for unknown reasons.
  	 . a workaround is to reset the chip and try again.
  	 .
  	 . Interestingly, the DOS packet driver *SETS* the IRQ on the card to
  	 . be what is requested on the command line.   I don't do that, mostly
  	 . because the card that I have uses a non-standard method of accessing
  	 . the IRQs, and because this _should_ work in most configurations.
  	 .
  	 . Specifying an IRQ is done with the assumption that the user knows
  	 . what (s)he is doing.  No checking is done!!!!
   	 .
  	*/
  	if ( dev->irq < 2 ) {
  		int	trials;
  
  		trials = 3;
  		while ( trials-- ) {
  			dev->irq = smc_findirq( ioaddr );
  			if ( dev->irq )
  				break;
  			/* kick the card and try again */
  			smc_reset( ioaddr );
  		}
  	}
  	if (dev->irq == 0 ) {
  		printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.
  ");
  		retval = -ENODEV;
  		goto err_out;
  	}
  
  	/* now, print out the card info, in a short format.. */
  
  	netdev_info(dev, "%s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ",
  		    version_string, revision_register & 0xF, ioaddr, dev->irq,
  		    if_string, memory);
  	/*
  	 . Print the Ethernet address
  	*/
  	netdev_info(dev, "ADDR: %pM
  ", dev->dev_addr);
  
  	/* Grab the IRQ */
  	retval = request_irq(dev->irq, smc_interrupt, 0, DRV_NAME, dev);
  	if (retval) {
  		netdev_warn(dev, "%s: unable to get IRQ %d (irqval=%d).
  ",
  			    DRV_NAME, dev->irq, retval);
  		goto err_out;
  	}
  
  	dev->netdev_ops			= &smc_netdev_ops;
  	dev->watchdog_timeo		= HZ/20;
  
  	return 0;
  
  err_out:
  	release_region(ioaddr, SMC_IO_EXTENT);
  	return retval;
  }
  
  #if SMC_DEBUG > 2
  static void print_packet( byte * buf, int length )
  {
  #if 0
  	print_hex_dump_debug(DRV_NAME, DUMP_PREFIX_OFFSET, 16, 1,
  			     buf, length, true);
  #endif
  }
  #endif
  
  
  /*
   * Open and Initialize the board
   *
   * Set up everything, reset the card, etc ..
   *
   */
  static int smc_open(struct net_device *dev)
  {
  	int	ioaddr = dev->base_addr;
  
  	int	i;	/* used to set hw ethernet address */
  
  	/* clear out all the junk that was put here before... */
  	memset(netdev_priv(dev), 0, sizeof(struct smc_local));
  
  	/* reset the hardware */
  
  	smc_reset( ioaddr );
  	smc_enable( ioaddr );
  
  	/* Select which interface to use */
  
  	SMC_SELECT_BANK( 1 );
  	if ( dev->if_port == 1 ) {
  		outw( inw( ioaddr + CONFIG ) & ~CFG_AUI_SELECT,
  			ioaddr + CONFIG );
  	}
  	else if ( dev->if_port == 2 ) {
  		outw( inw( ioaddr + CONFIG ) | CFG_AUI_SELECT,
  			ioaddr + CONFIG );
  	}
  
  	/*
    		According to Becker, I have to set the hardware address
  		at this point, because the (l)user can set it with an
  		ioctl.  Easily done...
  	*/
  	SMC_SELECT_BANK( 1 );
  	for ( i = 0; i < 6; i += 2 ) {
  		word	address;
  
  		address = dev->dev_addr[ i + 1 ] << 8 ;
  		address  |= dev->dev_addr[ i ];
  		outw( address, ioaddr + ADDR0 + i );
  	}
  
  	netif_start_queue(dev);
  	return 0;
  }
  
  /*--------------------------------------------------------
   . Called by the kernel to send a packet out into the void
   . of the net.  This routine is largely based on
   . skeleton.c, from Becker.
   .--------------------------------------------------------
  */
  
  static void smc_timeout(struct net_device *dev)
  {
  	/* If we get here, some higher level has decided we are broken.
  	   There should really be a "kick me" function call instead. */
  	netdev_warn(dev, CARDNAME": transmit timed out, %s?
  ",
  		    tx_done(dev) ? "IRQ conflict" : "network cable problem");
  	/* "kick" the adaptor */
  	smc_reset( dev->base_addr );
  	smc_enable( dev->base_addr );
  	dev->trans_start = jiffies; /* prevent tx timeout */
  	/* clear anything saved */
  	((struct smc_local *)netdev_priv(dev))->saved_skb = NULL;
  	netif_wake_queue(dev);
  }
  
  /*-------------------------------------------------------------
   .
   . smc_rcv -  receive a packet from the card
   .
   . There is ( at least ) a packet waiting to be read from
   . chip-memory.
   .
   . o Read the status
   . o If an error, record it
   . o otherwise, read in the packet
   --------------------------------------------------------------
  */
  static void smc_rcv(struct net_device *dev)
  {
  	int 	ioaddr = dev->base_addr;
  	int 	packet_number;
  	word	status;
  	word	packet_length;
  
  	/* assume bank 2 */
  
  	packet_number = inw( ioaddr + FIFO_PORTS );
  
  	if ( packet_number & FP_RXEMPTY ) {
  		/* we got called , but nothing was on the FIFO */
  		PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO.
  "));
  		/* don't need to restore anything */
  		return;
  	}
  
  	/*  start reading from the start of the packet */
  	outw( PTR_READ | PTR_RCV | PTR_AUTOINC, ioaddr + POINTER );
  
  	/* First two words are status and packet_length */
  	status 		= inw( ioaddr + DATA_1 );
  	packet_length 	= inw( ioaddr + DATA_1 );
  
  	packet_length &= 0x07ff;  /* mask off top bits */
  
  	PRINTK2(("RCV: STATUS %4x LENGTH %4x
  ", status, packet_length ));
  	/*
  	 . the packet length contains 3 extra words :
  	 . status, length, and an extra word with an odd byte .
  	*/
  	packet_length -= 6;
  
  	if ( !(status & RS_ERRORS ) ){
  		/* do stuff to make a new packet */
  		struct sk_buff  * skb;
  		byte		* data;
  
  		/* read one extra byte */
  		if ( status & RS_ODDFRAME )
  			packet_length++;
  
  		/* set multicast stats */
  		if ( status & RS_MULTICAST )
  			dev->stats.multicast++;
  
  		skb = netdev_alloc_skb(dev, packet_length + 5);
  		if ( skb == NULL ) {
  			dev->stats.rx_dropped++;
  			goto done;
  		}
  
  		/*
  		 ! This should work without alignment, but it could be
  		 ! in the worse case
  		*/
  
  		skb_reserve( skb, 2 );   /* 16 bit alignment */
  
  		data = skb_put( skb, packet_length);
  
  #ifdef USE_32_BIT
  		/* QUESTION:  Like in the TX routine, do I want
  		   to send the DWORDs or the bytes first, or some
  		   mixture.  A mixture might improve already slow PIO
  		   performance  */
  		PRINTK3((" Reading %d dwords (and %d bytes)
  ",
  			packet_length >> 2, packet_length & 3 ));
  		insl(ioaddr + DATA_1 , data, packet_length >> 2 );
  		/* read the left over bytes */
  		insb( ioaddr + DATA_1, data + (packet_length & 0xFFFFFC),
  			packet_length & 0x3  );
  #else
  		PRINTK3((" Reading %d words and %d byte(s)
  ",
  			(packet_length >> 1 ), packet_length & 1 ));
  		insw(ioaddr + DATA_1 , data, packet_length >> 1);
  		if ( packet_length & 1 ) {
  			data += packet_length & ~1;
  			*(data++) = inb( ioaddr + DATA_1 );
  		}
  #endif
  #if	SMC_DEBUG > 2
  			print_packet( data, packet_length );
  #endif
  
  		skb->protocol = eth_type_trans(skb, dev );
  		netif_rx(skb);
  		dev->stats.rx_packets++;
  		dev->stats.rx_bytes += packet_length;
  	} else {
  		/* error ... */
  		dev->stats.rx_errors++;
  
  		if ( status & RS_ALGNERR )  dev->stats.rx_frame_errors++;
  		if ( status & (RS_TOOSHORT | RS_TOOLONG ) )
  			dev->stats.rx_length_errors++;
  		if ( status & RS_BADCRC)	dev->stats.rx_crc_errors++;
  	}
  
  done:
  	/*  error or good, tell the card to get rid of this packet */
  	outw( MC_RELEASE, ioaddr + MMU_CMD );
  }
  
  
  /*************************************************************************
   . smc_tx
   .
   . Purpose:  Handle a transmit error message.   This will only be called
   .   when an error, because of the AUTO_RELEASE mode.
   .
   . Algorithm:
   .	Save pointer and packet no
   .	Get the packet no from the top of the queue
   .	check if it's valid ( if not, is this an error??? )
   .	read the status word
   .	record the error
   .	( resend?  Not really, since we don't want old packets around )
   .	Restore saved values
   ************************************************************************/
  static void smc_tx( struct net_device * dev )
  {
  	int	ioaddr = dev->base_addr;
  	struct smc_local *lp = netdev_priv(dev);
  	byte saved_packet;
  	byte packet_no;
  	word tx_status;
  
  
  	/* assume bank 2  */
  
  	saved_packet = inb( ioaddr + PNR_ARR );
  	packet_no = inw( ioaddr + FIFO_PORTS );
  	packet_no &= 0x7F;
  
  	/* select this as the packet to read from */
  	outb( packet_no, ioaddr + PNR_ARR );
  
  	/* read the first word from this packet */
  	outw( PTR_AUTOINC | PTR_READ, ioaddr + POINTER );
  
  	tx_status = inw( ioaddr + DATA_1 );
  	PRINTK3((CARDNAME": TX DONE STATUS: %4x
  ", tx_status));
  
  	dev->stats.tx_errors++;
  	if ( tx_status & TS_LOSTCAR ) dev->stats.tx_carrier_errors++;
  	if ( tx_status & TS_LATCOL  ) {
  		netdev_dbg(dev, CARDNAME": Late collision occurred on last xmit.
  ");
  		dev->stats.tx_window_errors++;
  	}
  #if 0
  		if ( tx_status & TS_16COL ) { ... }
  #endif
  
  	if ( tx_status & TS_SUCCESS ) {
  		netdev_info(dev, CARDNAME": Successful packet caused interrupt
  ");
  	}
  	/* re-enable transmit */
  	SMC_SELECT_BANK( 0 );
  	outw( inw( ioaddr + TCR ) | TCR_ENABLE, ioaddr + TCR );
  
  	/* kill the packet */
  	SMC_SELECT_BANK( 2 );
  	outw( MC_FREEPKT, ioaddr + MMU_CMD );
  
  	/* one less packet waiting for me */
  	lp->packets_waiting--;
  
  	outb( saved_packet, ioaddr + PNR_ARR );
  }
  
  /*--------------------------------------------------------------------
   .
   . This is the main routine of the driver, to handle the device when
   . it needs some attention.
   .
   . So:
   .   first, save state of the chipset
   .   branch off into routines to handle each case, and acknowledge
   .	    each to the interrupt register
   .   and finally restore state.
   .
   ---------------------------------------------------------------------*/
  
  static irqreturn_t smc_interrupt(int irq, void * dev_id)
  {
  	struct net_device *dev 	= dev_id;
  	int ioaddr 		= dev->base_addr;
  	struct smc_local *lp = netdev_priv(dev);
  
  	byte	status;
  	word	card_stats;
  	byte	mask;
  	int	timeout;
  	/* state registers */
  	word	saved_bank;
  	word	saved_pointer;
  	int handled = 0;
  
  
  	PRINTK3((CARDNAME": SMC interrupt started
  "));
  
  	saved_bank = inw( ioaddr + BANK_SELECT );
  
  	SMC_SELECT_BANK(2);
  	saved_pointer = inw( ioaddr + POINTER );
  
  	mask = inb( ioaddr + INT_MASK );
  	/* clear all interrupts */
  	outb( 0, ioaddr + INT_MASK );
  
  
  	/* set a timeout value, so I don't stay here forever */
  	timeout = 4;
  
  	PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x
  ", mask));
  	do {
  		/* read the status flag, and mask it */
  		status = inb( ioaddr + INTERRUPT ) & mask;
  		if (!status )
  			break;
  
  		handled = 1;
  
  		PRINTK3((KERN_WARNING CARDNAME
  			": Handling interrupt status %x
  ", status));
  
  		if (status & IM_RCV_INT) {
  			/* Got a packet(s). */
  			PRINTK2((KERN_WARNING CARDNAME
  				": Receive Interrupt
  "));
  			smc_rcv(dev);
  		} else if (status & IM_TX_INT ) {
  			PRINTK2((KERN_WARNING CARDNAME
  				": TX ERROR handled
  "));
  			smc_tx(dev);
  			outb(IM_TX_INT, ioaddr + INTERRUPT );
  		} else if (status & IM_TX_EMPTY_INT ) {
  			/* update stats */
  			SMC_SELECT_BANK( 0 );
  			card_stats = inw( ioaddr + COUNTER );
  			/* single collisions */
  			dev->stats.collisions += card_stats & 0xF;
  			card_stats >>= 4;
  			/* multiple collisions */
  			dev->stats.collisions += card_stats & 0xF;
  
  			/* these are for when linux supports these statistics */
  
  			SMC_SELECT_BANK( 2 );
  			PRINTK2((KERN_WARNING CARDNAME
  				": TX_BUFFER_EMPTY handled
  "));
  			outb( IM_TX_EMPTY_INT, ioaddr + INTERRUPT );
  			mask &= ~IM_TX_EMPTY_INT;
  			dev->stats.tx_packets += lp->packets_waiting;
  			lp->packets_waiting = 0;
  
  		} else if (status & IM_ALLOC_INT ) {
  			PRINTK2((KERN_DEBUG CARDNAME
  				": Allocation interrupt
  "));
  			/* clear this interrupt so it doesn't happen again */
  			mask &= ~IM_ALLOC_INT;
  
  			smc_hardware_send_packet( dev );
  
  			/* enable xmit interrupts based on this */
  			mask |= ( IM_TX_EMPTY_INT | IM_TX_INT );
  
  			/* and let the card send more packets to me */
  			netif_wake_queue(dev);
  
  			PRINTK2((CARDNAME": Handoff done successfully.
  "));
  		} else if (status & IM_RX_OVRN_INT ) {
  			dev->stats.rx_errors++;
  			dev->stats.rx_fifo_errors++;
  			outb( IM_RX_OVRN_INT, ioaddr + INTERRUPT );
  		} else if (status & IM_EPH_INT ) {
  			PRINTK((CARDNAME ": UNSUPPORTED: EPH INTERRUPT
  "));
  		} else if (status & IM_ERCV_INT ) {
  			PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT
  "));
  			outb( IM_ERCV_INT, ioaddr + INTERRUPT );
  		}
  	} while ( timeout -- );
  
  
  	/* restore state register */
  	SMC_SELECT_BANK( 2 );
  	outb( mask, ioaddr + INT_MASK );
  
  	PRINTK3((KERN_WARNING CARDNAME ": MASK is now %x
  ", mask));
  	outw( saved_pointer, ioaddr + POINTER );
  
  	SMC_SELECT_BANK( saved_bank );
  
  	PRINTK3((CARDNAME ": Interrupt done
  "));
  	return IRQ_RETVAL(handled);
  }
  
  
  /*----------------------------------------------------
   . smc_close
   .
   . this makes the board clean up everything that it can
   . and not talk to the outside world.   Caused by
   . an 'ifconfig ethX down'
   .
   -----------------------------------------------------*/
  static int smc_close(struct net_device *dev)
  {
  	netif_stop_queue(dev);
  	/* clear everything */
  	smc_shutdown( dev->base_addr );
  
  	/* Update the statistics here. */
  	return 0;
  }
  
  /*-----------------------------------------------------------
   . smc_set_multicast_list
   .
   . This routine will, depending on the values passed to it,
   . either make it accept multicast packets, go into
   . promiscuous mode ( for TCPDUMP and cousins ) or accept
   . a select set of multicast packets
  */
  static void smc_set_multicast_list(struct net_device *dev)
  {
  	short ioaddr = dev->base_addr;
  
  	SMC_SELECT_BANK(0);
  	if ( dev->flags & IFF_PROMISC )
  		outw( inw(ioaddr + RCR ) | RCR_PROMISC, ioaddr + RCR );
  
  /* BUG?  I never disable promiscuous mode if multicasting was turned on.
     Now, I turn off promiscuous mode, but I don't do anything to multicasting
     when promiscuous mode is turned on.
  */
  
  	/* Here, I am setting this to accept all multicast packets.
  	   I don't need to zero the multicast table, because the flag is
  	   checked before the table is
  	*/
  	else if (dev->flags & IFF_ALLMULTI)
  		outw( inw(ioaddr + RCR ) | RCR_ALMUL, ioaddr + RCR );
  
  	/* We just get all multicast packets even if we only want them
  	 . from one source.  This will be changed at some future
  	 . point. */
  	else if (!netdev_mc_empty(dev)) {
  		/* support hardware multicasting */
  
  		/* be sure I get rid of flags I might have set */
  		outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
  			ioaddr + RCR );
  		/* NOTE: this has to set the bank, so make sure it is the
  		   last thing called.  The bank is set to zero at the top */
  		smc_setmulticast(ioaddr, dev);
  	}
  	else  {
  		outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
  			ioaddr + RCR );
  
  		/*
  		  since I'm disabling all multicast entirely, I need to
  		  clear the multicast list
  		*/
  		SMC_SELECT_BANK( 3 );
  		outw( 0, ioaddr + MULTICAST1 );
  		outw( 0, ioaddr + MULTICAST2 );
  		outw( 0, ioaddr + MULTICAST3 );
  		outw( 0, ioaddr + MULTICAST4 );
  	}
  }
  
  #ifdef MODULE
  
  static struct net_device *devSMC9194;
  MODULE_LICENSE("GPL");
  
  module_param(io, int, 0);
  module_param(irq, int, 0);
  module_param(ifport, int, 0);
  MODULE_PARM_DESC(io, "SMC 99194 I/O base address");
  MODULE_PARM_DESC(irq, "SMC 99194 IRQ number");
  MODULE_PARM_DESC(ifport, "SMC 99194 interface port (0-default, 1-TP, 2-AUI)");
  
  int __init init_module(void)
  {
  	if (io == 0)
  		printk(KERN_WARNING
  		CARDNAME": You shouldn't use auto-probing with insmod!
  " );
  
  	/* copy the parameters from insmod into the device structure */
  	devSMC9194 = smc_init(-1);
  	return PTR_ERR_OR_ZERO(devSMC9194);
  }
  
  void __exit cleanup_module(void)
  {
  	unregister_netdev(devSMC9194);
  	free_irq(devSMC9194->irq, devSMC9194);
  	release_region(devSMC9194->base_addr, SMC_IO_EXTENT);
  	free_netdev(devSMC9194);
  }
  
  #endif /* MODULE */