smc9194.c

Go to the documentation of this file.

/*------------------------------------------------------------------------
 . 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               ( [email protected] )
 . contributors:
 .      Arnaldo Carvalho de Melo <[email protected]>
 .
 . Hardware multicast code from Peter Cammaert ( [email protected] )
 .
 . Sources:
 .    o   SMC databook
 .    o   skeleton.c by Donald Becker ( [email protected] )
 .    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 ([email protected])\n";

#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

#if defined(__H8300H__) || defined(__H8300S__)
#define NO_AUTOPROBE
#undef insl
#undef outsl
#define insl(a,b,l)  io_insl_noswap(a,b,l)
#define outsl(a,b,l) io_outsl_noswap(a,b,l)
#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;
};

#if defined(CONFIG_H8S_EDOSK2674)
static struct devlist smc_devlist[] __initdata = {
    {.port = 0xf80000, .irq = 16},
    {.port = 0,        .irq = 0 },
};
#else
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},
};
#endif
/*
 . 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.\n" );
        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.\n");
        /* 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.\n"));
        /* 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\n"));
        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! */
        printk(KERN_DEBUG CARDNAME": Memory allocation failed.\n");
        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\n", 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 );
#if !defined(__H8300H__) && !defined(__H8300S__)
        outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
#else
        ctrl_outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
#endif
    }
    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\n", 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;
    static unsigned version_printed;
    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;
    }
#if !defined(CONFIG_H8S_EDOSK2674)
    /* 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\n",
            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;
    }
#else
    (void)base_address_register; /* Warning suppression */
#endif


    /*  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.\n", 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. */

    if (version_printed++ == 0)
        printk("%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.\n");
        retval = -ENODEV;
        goto err_out;
    }

    /* now, print out the card info, in a short format.. */

    printk("%s: %s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ", dev->name,
        version_string, revision_register & 0xF, ioaddr, dev->irq,
        if_string, memory );
    /*
     . Print the Ethernet address
    */
    printk("ADDR: %pM\n", dev->dev_addr);

    /* Grab the IRQ */
        retval = request_irq(dev->irq, smc_interrupt, 0, DRV_NAME, dev);
        if (retval) {
        printk("%s: unable to get IRQ %d (irqval=%d).\n", 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
    int i;
    int remainder;
    int lines;

    printk("Packet of length %d\n", length);
    lines = length / 16;
    remainder = length % 16;

    for ( i = 0; i < lines ; i ++ ) {
        int cur;

        for ( cur = 0; cur < 8; cur ++ ) {
            byte a, b;

            a = *(buf ++ );
            b = *(buf ++ );
            printk("%02x%02x ", a, b );
        }
        printk("\n");
    }
    for ( i = 0; i < remainder/2 ; i++ ) {
        byte a, b;

        a = *(buf ++ );
        b = *(buf ++ );
        printk("%02x%02x ", a, b );
    }
    printk("\n");
#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. */
    printk(KERN_WARNING CARDNAME": transmit timed out, %s?\n",
        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.\n"));
        /* 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\n", 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 ) {
            printk(KERN_NOTICE CARDNAME ": Low memory, packet dropped.\n");
            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)\n",
            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)\n",
            (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\n", tx_status));

    dev->stats.tx_errors++;
    if ( tx_status & TS_LOSTCAR ) dev->stats.tx_carrier_errors++;
    if ( tx_status & TS_LATCOL  ) {
        printk(KERN_DEBUG CARDNAME
            ": Late collision occurred on last xmit.\n");
        dev->stats.tx_window_errors++;
    }
#if 0
        if ( tx_status & TS_16COL ) { ... }
#endif

    if ( tx_status & TS_SUCCESS ) {
        printk(CARDNAME": Successful packet caused interrupt\n");
    }
    /* 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\n"));

    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\n", 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\n", status));

        if (status & IM_RCV_INT) {
            /* Got a packet(s). */
            PRINTK2((KERN_WARNING CARDNAME
                ": Receive Interrupt\n"));
            smc_rcv(dev);
        } else if (status & IM_TX_INT ) {
            PRINTK2((KERN_WARNING CARDNAME
                ": TX ERROR handled\n"));
            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\n"));
            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\n"));
            /* 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.\n"));
        } 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\n"));
        } else if (status & IM_ERCV_INT ) {
            PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT\n"));
            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\n", mask));
    outw( saved_pointer, ioaddr + POINTER );

    SMC_SELECT_BANK( saved_bank );

    PRINTK3((CARDNAME ": Interrupt done\n"));
    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!\n" );

    /* copy the parameters from insmod into the device structure */
    devSMC9194 = smc_init(-1);
    if (IS_ERR(devSMC9194))
        return PTR_ERR(devSMC9194);
    return 0;
}

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 */