/*------------------------------------------------------------------------
 . 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@cesdis.gsfc.nasa.gov )
 .    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
 .	03/05/00  Nicolas Pitre	IO access now done through SMC_* macros so
 .				architectures different than a PC can easily
 .				port this driver.
 .				Worked it out for buses that can't make
 .				byte access.
 .	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"
 ----------------------------------------------------------------------------*/

static const char version[] =
	"smc9194.c:v0.14 12/15/00 by Erik Stahlman (erik@vt.edu)\n";

#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/errno.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include "smc9194.h"

#ifdef CONFIG_SA1100_FLEXANET
#include <asm/arch/flexanet.h>
#endif

/*------------------------------------------------------------------------
 .
 . Configuration options, for the experienced user to change.
 .
 -------------------------------------------------------------------------*/

#ifdef CONFIG_ISA
	
/*
 . Do you want to use 32 bit xfers?  This should work on all chips, as
 . the chipset is designed to accommodate them.
*/
#define USE_32_BIT 1

/*
 .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.
*/
static unsigned int smc_portlist[] __initdata = { 
	0x200, 0x220, 0x240, 0x260, 0x280, 0x2A0, 0x2C0, 0x2E0,
	0x300, 0x320, 0x340, 0x360, 0x380, 0x3A0, 0x3C0, 0x3E0, 0
};

#endif  /* CONFIG_ISA */

/*
 . 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 {
	/*
 	   these are things that the kernel wants me to keep, so users
	   can find out semi-useless statistics of how well the card is
	   performing
 	*/
	struct net_device_stats stats;

	/*
	   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.
*/
int smc_init(struct net_device *dev);

/*
 . 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);

/*
 . This routine allows the proc file system to query the driver's
 . statistics.
*/
static struct net_device_stats * smc_query_statistics( 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);

/*
 . CRC compute
 */
static int crc32( char * s, int length );

/*---------------------------------------------------------------
 .
 . Interrupt level calls..
 .
 ----------------------------------------------------------------*/

/*
 . Handles the actual interrupt
*/
static void smc_interrupt(int irq, void *, struct pt_regs *regs);
/*
 . 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 int  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 );
	SMC_outw( RCR_SOFTRESET, RCR );

	/* this should pause enough for the chip to be happy */
	SMC_DELAY( );

	/* Set the transmit and receive configuration registers to
	   default values */
	SMC_outw( RCR_CLEAR, RCR );
	SMC_outw( TCR_CLEAR, 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 );
	SMC_outw( SMC_inw( CONTROL ) | CTL_AUTO_RELEASE, CONTROL );

	/* Reset the MMU */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_RESET, 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 */

	SMC_SET_INT( 0 );
}

/*
 . 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*/
	SMC_outw( TCR_NORMAL, TCR );
	SMC_outw( RCR_NORMAL, RCR );

	/* now, enable interrupts */
	SMC_SET_INT( SMC_INTERRUPT_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_SET_INT( 0 );

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK( 0 );
	SMC_outw( RCR_CLEAR, RCR );
	SMC_outw( TCR_CLEAR, TCR );
#if 0
	/* finally, shut the chip down */
	SMC_SELECT_BANK( 1 );
	SMC_outw( SMC_inw( CONTROL ) | CTL_POWERDOWN, CONTROL );
#endif
}


/*
 . Function: smc_setmulticast( int ioaddr, int count, dev_mc_list * adds )
 . 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, int count, struct dev_mc_list * addrs ) {
	int			i;
	unsigned char		multicast_table[ 8 ];
	struct dev_mc_list	* cur_addr;
	/* 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 ) );

	cur_addr = addrs;
	for ( i = 0; i < count ; i ++, cur_addr = cur_addr->next  ) {
		int position;

		/* do we have a pointer here? */
		if ( !cur_addr )
			break;
		/* make sure this is a multicast address - shouldn't this
		   be a given if we have it here ? */
		if ( !( *cur_addr->dmi_addr & 1 ) )
			continue;

		/* only use the low order bits */
		position = crc32( cur_addr->dmi_addr, 6 ) & 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++ ) {
		SMC_outb( multicast_table[i], MULTICAST1 + i );
	}
}

/*
  Finds the CRC32 of a set of bytes.
  Again, from Peter Cammaert's code.
*/
static int crc32( char * s, int length ) {
	/* indices */
	int perByte;
	int perBit;
	/* crc polynomial for Ethernet */
	const unsigned long poly = 0xedb88320;
	/* crc value - preinitialized to all 1's */
	unsigned long crc_value = 0xffffffff;

	for ( perByte = 0; perByte < length; perByte ++ ) {
		unsigned char	c;

		c = *(s++);
		for ( perBit = 0; perBit < 8; perBit++ ) {
			crc_value = (crc_value>>1)^
				(((crc_value^c)&0x01)?poly:0);
			c >>= 1;
		}
	}
	return	crc_value;
}


/*
 . 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 int smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * dev )
{
	struct smc_local *lp 	= (struct smc_local *)dev->priv;
	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. */
		lp->stats.tx_aborted_errors++;
		printk(CARDNAME": Bad Craziness - sent packet while busy.\n" );
		return 1;
	}
	lp->saved_skb = skb;

	length = ETH_ZLEN < skb->len ? skb->len : 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 0;
	}
	/* either way, a packet is waiting now */
	lp->packets_waiting++;

	/* now, try to allocate the memory */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_ALLOC | numPages, 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 = SMC_inb( INTERRUPT );
		if ( status & IM_ALLOC_INT ) {
			/* acknowledge the interrupt */
			SMC_outb( IM_ALLOC_INT, 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 0;
   	}
	/* or YES! I can send the packet now.. */
	smc_hardware_send_packet(dev);
	netif_wake_queue(dev);
	return 0;
}

/*
 . 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 = (struct smc_local *)dev->priv;
	byte	 		packet_no;
	struct sk_buff * 	skb = lp->saved_skb;
	word			length;
	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 = SMC_inb( 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 */
	SMC_outb( packet_no, PNR_ARR );

	/* point to the beginning of the packet */
	SMC_outw( PTR_AUTOINC, POINTER );

   	PRINTK3((CARDNAME": Trying to xmit packet of length %d\n", length ));
#if SMC_DEBUG > 5
	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
	SMC_outl(  (length+6) << 16, DATA_1 );
#else
	SMC_outw( 0, DATA_1 );
	/* send the packet length ( +6 for status words, length, and ctl*/
	SMC_outw( (length+6), DATA_1 );
#endif

#ifdef USE_32_BIT
	/* 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?
	*/
	SMC_outsl( DATA_1, buf, length >> 2 );
	if ( length & 0x2 )
		SMC_outw( *((word *)(buf + (length & ~3))), DATA_1);
#else
	SMC_outsw( DATA_1, buf, (length) >> 1);
#endif
	/* Send the last word, including last byte if there is one. */
	if ( (length & 1) == 0 ) {
		SMC_outw( 0, DATA_1 );
	} else {
		SMC_outw( buf[length-1] | 0x2000, DATA_1 );
	}

	/* enable the interrupts */
	SMC_ENABLE_INT( (IM_TX_INT | IM_TX_EMPTY_INT) );

	/* and let the chipset deal with it */
	SMC_outw( MC_ENQUEUE, 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);

	return;
}

/*-------------------------------------------------------------------------
 |
 | smc_init( struct net_device * dev )
 |   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:
 |	0 --> there is a device
 |	anything else, error
 |
 ---------------------------------------------------------------------------
*/
int __init smc_init(struct net_device *dev)
{
#ifdef CONFIG_ASSABET_NEPONSET
	volatile unsigned *ioaddr, *attaddr;
	unsigned long base_addr, flags;

	/* enable ethernet osc */
	NCR_0 |= NCR_ENET_OSC_EN;

	base_addr = 0x18000000;
	ioaddr = (volatile unsigned *)ioremap(base_addr, 8*1024);

	base_addr |= (1 << 25) + (0x8000*4);
	attaddr = (volatile unsigned *)ioremap(base_addr, 4*1024);

	__save_flags(flags);
	__cli();

	/* enable the device */
	attaddr[LAN91C96_ECOR] |= ECOR_RESET;
	udelay(100);

	/* the device will ignore all writes to the enable bit while reset is
	 * asserted, even if the reset bit is cleared in the same write. Must
	 * clear reset first, then enable the device.
	 */
	attaddr[LAN91C96_ECOR] &= ~ECOR_RESET;
	attaddr[LAN91C96_ECOR] |= ECOR_ENABLE;

	__restore_flags(flags);

	/* force byte mode */
	attaddr[LAN91C96_ECSR] |= ECSR_IOIS8;

	dev->irq = NEPONSET_ETHERNET_IRQ;

	return smc_probe(dev, (int)ioaddr);
#endif

#ifdef CONFIG_SA1100_PFS168
	volatile unsigned *ioaddr, *attaddr;
	unsigned long base_addr, flags;

	/* First, enable access to the SMC91C96 via some undocumented black
	 * magic register bit flipping.
	 */
	base_addr = (volatile unsigned *)ioremap(0x1a020000, 8*1024);
	((unsigned char *)(base_addr))[0] = 0x41;
	udelay(100);
	((unsigned char *)(base_addr))[8] = 0x00;
	udelay(100);

	/*
	 * The PFS-168 uses GPIO26 for the SMC-9196 interrupt.	Before we use this, we must first set up a
	 * couple things.  I looked in drivers/pcmcia/sa1100_assabet.c to see how it was done for the Assabet
	 * compact flash, and copied that to come up with...
	 */
	/* Set GPIO 26 to input */
	GPDR &= ~(GPIO_GPIO(26));
	/* Set transition detect */
	set_GPIO_IRQ_edge( GPIO_GPIO(26), GPIO_RISING_EDGE );

	base_addr = (volatile unsigned *)ioremap(0x18000000, 8*1024);

	dev->irq = IRQ_GPIO26;	/* Uses one of the pooled GPIO IRQs */

	return smc_probe(dev, (int)base_addr);
#endif

#if defined(CONFIG_SA1100_GRAPHICSCLIENT) || defined(CONFIG_SA1100_GRAPHICSMASTER)
	int base_addr = ADS_ETHERNET;

	// Max recovery timing
	MSC1 &= ~0xFFFF;
	MSC1 |= 0x8649;
	return smc_probe(dev, base_addr);
#endif

#ifdef CONFIG_SA1100_PANGOLIN
	volatile unsigned short *attaddr;
	unsigned long base_addr = 0, flags = 0;
	int ioaddr = 0;

	//initialize on-board SMSC91C96 related GPIO pin
	// IRQ   <-- GPIO26 
	// RESET --> GPIO8
	GPDR &= ~PANGOLIN_LAN_IRQ;
	/* Set transition detect */
	set_GPIO_IRQ_edge( PANGOLIN_LAN_IRQ, GPIO_FALLING_EDGE );
	GPDR |= PANGOLIN_LAN_RESET;
	GPCR = PANGOLIN_LAN_RESET;

	base_addr = PANGOLIN_LAN_ADDR;
	ioaddr = (int)ioremap(base_addr, 9*PAGE_SIZE);
	attaddr = (volatile unsigned short *)(ioaddr+ETHER_FUNC_OFFSET);

	__save_flags(flags);
	__cli();

	/* enable the device */
	attaddr[LAN91C96_ECOR] |= ECOR_RESET;
	udelay(100);

	/* the device will ignore all writes to the enable bit while reset is
	 * asserted, even if the reset bit is cleared in the same write. Must
	 * clear reset first, then enable the device.
	 */
	attaddr[LAN91C96_ECOR] &= ~ECOR_RESET;
	attaddr[LAN91C96_ECOR] |= ECOR_ENABLE;

	__restore_flags(flags);

	/* byte & word mode */
	//attaddr[LAN91C96_ECSR] &= ~ECSR_IOIS8;
	attaddr[LAN91C96_ECSR-1] &= ~ECSR_IOIS8;

	dev->irq = PANGOLIN_IRQ_LAN_IRQ;

	return smc_probe(dev, ioaddr);
#endif

#ifdef CONFIG_ISA
	int i;
	int base_addr = dev->base_addr;

	SET_MODULE_OWNER(dev);

	/*  try a specific location */
	if (base_addr > 0x1ff)
		return smc_probe(dev, base_addr);
	else if (base_addr != 0)
		return -ENXIO;

	/* check every ethernet address */
	for (i = 0; smc_portlist[i]; i++)
		if (smc_probe(dev, smc_portlist[i]) == 0)
			return 0;

	/* couldn't find anything */
	return -ENODEV;
#endif

#ifdef CONFIG_SA1100_FLEXANET
	volatile unsigned *attaddr;
	int ioaddr;
	unsigned flags;

	/* Get the I/O and attribute base addresses declared in flexanet.h */
	ioaddr  = FHH_ETH_IOBASE;
	attaddr = (unsigned *) (FHH_ETH_MMBASE + (0x8000*4));

	__save_flags(flags);
	__cli();

	/* first reset, then enable the device. Sequence is critical */
	attaddr[LAN91C96_ECOR] |= ECOR_RESET;
	udelay(100);
	attaddr[LAN91C96_ECOR] &= ~ECOR_RESET;
	attaddr[LAN91C96_ECOR] |= ECOR_ENABLE;

	__restore_flags(flags);

	/* force 16-bit mode */
	attaddr[LAN91C96_ECSR] &= ~ECSR_IOIS8;

	/* Ethernet IRQ setup (GPIO is input, falling edge) */
	GPDR &= ~(GPIO_ETH_IRQ);
	set_GPIO_IRQ_edge( GPIO_ETH_IRQ, GPIO_FALLING_EDGE );
	
	dev->irq = IRQ_GPIO_ETH;

	return smc_probe(dev, ioaddr);
#endif
}

/*----------------------------------------------------------------------
 . 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,
 ------------------------------------------------------------------------
*/
int __init smc_findirq( int ioaddr )
{
	int	timeout = 20;
	unsigned long cookie;


	/* I have to do a STI() here, because this is called from
	   a routine that does an CLI during this process, making it
	   rather difficult to get interrupts for auto detection */
	sti();

	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.
	 */

	/* enable ALLOCation interrupts ONLY */
	SMC_SET_INT( IM_ALLOC_INT );

	/*
 	 . Allocate 512 bytes of memory.  Note that the chip was just
	 . reset so all the memory is available
	*/
	SMC_outw( MC_ALLOC | 1, MMU_CMD );

	/*
	 . Wait until positive that the interrupt has been generated
	*/
	while ( timeout ) {
		byte	int_status;

		int_status = SMC_inb( 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 autoirq_report 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 autoirq_report fails to report anything.
	   This should fix autoirq_* problems.
	*/
	SMC_DELAY();
	SMC_DELAY();

	/* and disable all interrupts again */
	SMC_SET_INT( 0 );

	/* clear hardware interrupts again, because that's how it
	   was when I was called... */
	cli();

	/* and return what I found */
	return probe_irq_off(cookie);
}

/*----------------------------------------------------------------------
 . 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, chip, rev, 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, dev->name))
		return -EBUSY;

	/* First, see if the high byte is 0x33 */
	bank = SMC_inw( 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.  */
	SMC_outw( 0x0, BANK_SELECT );
	bank = SMC_inw( BANK_SELECT );
	if ( (bank & 0xFF00 ) != 0x3300 ) {
		retval = -ENODEV;
		goto err_out;
	}

#ifdef CONFIG_ISA
	/* 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 = SMC_inw( 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;
	}
#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  = SMC_inw( 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 = SMC_inw( ADDR0 + i );
		dev->dev_addr[ i + 1] = address >> 8;
		dev->dev_addr[ i ] = address & 0xFF;
	}

#if defined(CONFIG_ASSABET_NEPONSET) || defined(CONFIG_SA1100_GRAPHICSCLIENT) || \
    defined CONFIG_SA1100_PFS168) || defined(CONFIG_SA1100_FLEXANET) || \
    defined (CONFIG_SA1100_GRAPHICSMASTER) || defined(CONFIG_SA1100_PANGOLIN)
	/* 
	 * Check if MAC address is all zeroes or all ones 
	 * (many boards got out uninitialized) 
	 */
	for ( i = 0; i < 6; i++ )
		if (dev->dev_addr[i] != 0 && dev->dev_addr[i] != 0xff)
			break;
	/* If so, add a dummy one */
	if (i == 6) {
		printk (CARDNAME": uninitialized MAC address detected -- using a dummy one\n");
		for ( i = 0; i < 6; i++ )
			dev->dev_addr[ i ] = i;
	}
#endif

	/* get the memory information */

	SMC_SELECT_BANK( 0 );
	memory_info_register = SMC_inw( MIR );
	memory_cfg_register  = SMC_inw( 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  = SMC_inw( REVISION );

	chip = (revision_register >> 4) & 0xF;
	rev = revision_register & 0xF;

	if (chip == CHIP_9194 && rev >= 6)
		chip = CHIP_9196;

	version_string = chip_ids[ chip ];
	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 = SMC_inw( 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;
	}
	dev->irq = irq_cannonicalize(dev->irq);

	/* 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: ");
	for (i = 0; i < 5; i++)
		printk("%2.2x:", dev->dev_addr[i] );
	printk("%2.2x \n", dev->dev_addr[5] );


	/* Initialize the private structure. */
	if (dev->priv == NULL) {
		dev->priv = kmalloc(sizeof(struct smc_local), GFP_KERNEL);
		if (dev->priv == NULL) {
			retval = -ENOMEM;
			goto err_out;
		}
	}
	/* set the private data to zero by default */
	memset(dev->priv, 0, sizeof(struct smc_local));

	/* Fill in the fields of the device structure with ethernet values. */
	ether_setup(dev);

	/* Grab the IRQ */
      	retval = request_irq(dev->irq, &smc_interrupt, 0, dev->name, dev);
      	if (retval) {
		printk("%s: unable to get IRQ %d (irqval=%d).\n", dev->name,
			dev->irq, retval);
		kfree(dev->priv);
		dev->priv = NULL;
  	  	goto err_out;
      	}

	dev->open		        = smc_open;
	dev->stop		        = smc_close;
	dev->hard_start_xmit    	= smc_wait_to_send_packet;
	dev->tx_timeout		    	= smc_timeout;
	dev->watchdog_timeo		= HZ/20;
	dev->get_stats			= smc_query_statistics;
	dev->set_multicast_list 	= smc_set_multicast_list;

	return 0;

err_out:
	release_region(ioaddr, SMC_IO_EXTENT);
	return retval;
}

#if SMC_DEBUG > 2
static void print_packet( byte * buf, int length )
{
	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 );
	}
	if (remainder & 1) {
		byte a;

		a = *(buf ++ );
		printk("%02x ", a );
	}
	printk("\n");
}
#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(dev->priv, 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 ) {
		SMC_outw( SMC_inw( CONFIG ) & ~CFG_AUI_SELECT, CONFIG );
	}
	else if ( dev->if_port == 2 ) {
		SMC_outw( SMC_inw( CONFIG ) | CFG_AUI_SELECT, 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 ];
		SMC_outw( address, 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;
	/* clear anything saved */
	((struct smc_local *)dev->priv)->saved_skb = NULL;
	netif_wake_queue(dev);
}

/*--------------------------------------------------------------------
 .
 . 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 void smc_interrupt(int irq, void * dev_id,  struct pt_regs * regs)
{
	struct net_device *dev 	= dev_id;
	int ioaddr 		= dev->base_addr;
	struct smc_local *lp 	= (struct smc_local *)dev->priv;

	byte	status;
	word	card_stats;
	byte	mask;
	int	timeout;
	/* state registers */
	word	saved_bank;
	word	saved_pointer;

	PRINTK3((CARDNAME": SMC interrupt started \n"));

	saved_bank = SMC_inw( BANK_SELECT );

	SMC_SELECT_BANK(2);
	saved_pointer = SMC_inw( POINTER );

	mask = SMC_inb( INT_MASK );
	/* clear all interrupts */
	SMC_outw( 0, INTERRUPT );


	/* 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 = SMC_inb( INTERRUPT ) & mask;
		if (!status )
			break;

		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);
			SMC_outw( IM_TX_INT, INTERRUPT );
		} else if (status & IM_TX_EMPTY_INT ) {
			/* update stats */
			SMC_SELECT_BANK( 0 );
			card_stats = SMC_inw( COUNTER );
			/* single collisions */
			lp->stats.collisions += card_stats & 0xF;
			card_stats >>= 4;
			/* multiple collisions */
			lp->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"));
			SMC_outw( IM_TX_EMPTY_INT, INTERRUPT );
			mask &= ~IM_TX_EMPTY_INT;
			lp->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 ) {
			lp->stats.rx_errors++;
			lp->stats.rx_fifo_errors++;
			SMC_outw( IM_RX_OVRN_INT, 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"));
			SMC_outw( IM_ERCV_INT, INTERRUPT );
		}
	} while ( timeout -- );


	/* restore state register */
	SMC_SET_INT( mask );

	PRINTK3(( KERN_WARNING CARDNAME ": MASK is now %x \n", mask ));
	SMC_outw( saved_pointer, POINTER );

	SMC_SELECT_BANK( saved_bank );

	PRINTK3((CARDNAME ": Interrupt done\n"));
	return;
}

/*-------------------------------------------------------------
 .
 . 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)
{
	struct smc_local *lp = (struct smc_local *)dev->priv;
	int 	ioaddr = dev->base_addr;
	int 	packet_number;
	word	status;
	word	packet_length;

	/* assume bank 2 */

	packet_number = SMC_inw( 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 */
	SMC_outw( PTR_READ | PTR_RCV | PTR_AUTOINC, POINTER );

	/* First two words are status and packet_length */
	status 		= SMC_inw( DATA_1 );
	packet_length 	= SMC_inw( 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 )
			lp->stats.multicast++;

		skb = dev_alloc_skb( packet_length + 5);

		if ( skb == NULL ) {
			printk(KERN_NOTICE CARDNAME ": Low memory, packet dropped.\n");
			lp->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 */

		skb->dev = dev;
		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 ));
		SMC_insl( DATA_1, data, packet_length >> 2 );
		/* read the left over word */
		if (packet_length & 2)
			*(word*)(data + (packet_length & ~3)) = SMC_inw( DATA_1 );
#else
		PRINTK3((" Reading %d words and %d byte(s) \n",
			(packet_length >> 1 ), packet_length & 1 ));

		SMC_insw( DATA_1, data, (packet_length >> 1) );
#endif
		/* read the last word, possibly containing the odd byte */
		if (packet_length & 1)
			data[packet_length-1] = SMC_inw( DATA_1 );
		else
			SMC_inw( DATA_1 );
#if	SMC_DEBUG > 2
			print_packet( data, packet_length );
#endif

		skb->protocol = eth_type_trans(skb, dev );
		netif_rx(skb);
		dev->last_rx = jiffies;
		lp->stats.rx_packets++;
		lp->stats.rx_bytes += packet_length;
	} else {
		/* error ... */
		lp->stats.rx_errors++;

		if ( status & RS_ALGNERR )  lp->stats.rx_frame_errors++;
		if ( status & (RS_TOOSHORT | RS_TOOLONG ) )
			lp->stats.rx_length_errors++;
		if ( status & RS_BADCRC)	lp->stats.rx_crc_errors++;
	}

done:
	/*  error or good, tell the card to get rid of this packet */
	SMC_outw( MC_RELEASE, 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 = (struct smc_local *)dev->priv;
	byte saved_packet;
	byte packet_no;
	word tx_status;


	/* assume bank 2  */

	saved_packet = SMC_inb( PNR_ARR );
	packet_no = SMC_inw( FIFO_PORTS );
	packet_no &= 0x7F;

	/* select this as the packet to read from */
	SMC_outb( packet_no, PNR_ARR );

	/* read the first word from this packet */
	SMC_outw( PTR_AUTOINC | PTR_READ, POINTER );

#if defined(CONFIG_SA1100_GRAPHICSCLIENT)
	SMC_DELAY();
	SMC_DELAY();
	SMC_DELAY();
#endif

	tx_status = SMC_inw( DATA_1 );
	PRINTK3((CARDNAME": TX DONE STATUS: %4x \n", tx_status ));

	lp->stats.tx_errors++;
	if ( tx_status & TS_LOSTCAR ) lp->stats.tx_carrier_errors++;
	if ( tx_status & TS_LATCOL  ) {
		printk(KERN_DEBUG CARDNAME
			": Late collision occurred on last xmit.\n");
		lp->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 );
	SMC_outw( SMC_inw( TCR ) | TCR_ENABLE, TCR );

	/* kill the packet */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_FREEPKT, MMU_CMD );

	/* one less packet waiting for me */
	lp->packets_waiting--;

	SMC_outb( saved_packet, PNR_ARR );
	return;
}

/*----------------------------------------------------
 . 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;
}

/*------------------------------------------------------------
 . Get the current statistics.
 . This may be called with the card open or closed.
 .-------------------------------------------------------------*/
static struct net_device_stats* smc_query_statistics(struct net_device *dev) {
	struct smc_local *lp = (struct smc_local *)dev->priv;

	return &lp->stats;
}

/*-----------------------------------------------------------
 . 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)
{
	int ioaddr = dev->base_addr;

	SMC_SELECT_BANK(0);
	if ( dev->flags & IFF_PROMISC )
		SMC_outw( SMC_inw( RCR ) | RCR_PROMISC, 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)
		SMC_outw( SMC_inw( RCR ) | RCR_ALMUL, 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 (dev->mc_count )  {
		/* support hardware multicasting */

		/* be sure I get rid of flags I might have set */
		SMC_outw( SMC_inw( RCR ) & ~(RCR_PROMISC | RCR_ALMUL), 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->mc_count, dev->mc_list );
	}
	else  {
		SMC_outw( SMC_inw( RCR ) & ~(RCR_PROMISC | RCR_ALMUL), RCR );

		/*
		  since I'm disabling all multicast entirely, I need to
		  clear the multicast list
		*/
		SMC_SELECT_BANK( 3 );
		SMC_outw( 0, MULTICAST1 );
		SMC_outw( 0, MULTICAST2 );
		SMC_outw( 0, MULTICAST3 );
		SMC_outw( 0, MULTICAST4 );
	}
}

#ifdef MODULE

static struct net_device devSMC9194;
static int io;
static int irq;
static int ifport;

MODULE_PARM(io, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(ifport, "i");
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_module(void)
{
	int result;

	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.base_addr = io;
	devSMC9194.irq       = irq;
	devSMC9194.if_port	= ifport;
	devSMC9194.init   	= smc_init;
	if ((result = register_netdev(&devSMC9194)) != 0)
		return result;

	return 0;
}

void cleanup_module(void)
{
	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	unregister_netdev(&devSMC9194);

	free_irq(devSMC9194.irq, &devSMC9194);
	release_region(devSMC9194.base_addr, SMC_IO_EXTENT);

	if (devSMC9194.priv)
		kfree(devSMC9194.priv);
}

#endif /* MODULE */
