drivers/smc91111.c

/*------------------------------------------------------------------------
 . smc91111.c
 . This is a driver for SMSC's 91C111 single-chip Ethernet device.
 .
 . (C) Copyright 2002
 . Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 . Rolf Offermanns <rof@sysgo.de>
 .
 . Copyright (C) 2001 Standard Microsystems Corporation (SMSC)
 .       Developed by Simple Network Magic Corporation (SNMC)
 . Copyright (C) 1996 by Erik Stahlman (ES)
 .
 . This program is free software; you can redistribute it and/or modify
 . it under the terms of the GNU General Public License as published by
 . the Free Software Foundation; either version 2 of the License, or
 . (at your option) any later version.
 .
 . This program is distributed in the hope that it will be useful,
 . but WITHOUT ANY WARRANTY; without even the implied warranty of
 . MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 . GNU General Public License for more details.
 .
 . You should have received a copy of the GNU General Public License
 . along with this program; if not, write to the Free Software
 . Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 .
 . Information contained in this file was obtained from the LAN91C111
 . manual from SMC.  To get a copy, if you really want one, you can find
 . information under www.smsc.com.
 .
 .
 . "Features" of the SMC chip:
 .   Integrated PHY/MAC for 10/100BaseT Operation
 .   Supports internal and external MII
 .   Integrated 8K packet memory
 .   EEPROM interface for configuration
 .
 . Arguments:
 . 	io	= for the base address
 .	irq	= for the IRQ
 .
 . author:
 . 	Erik Stahlman				( erik@vt.edu )
 . 	Daris A Nevil				( dnevil@snmc.com )
 .
 .
 . Hardware multicast code from Peter Cammaert ( pc@denkart.be )
 .
 . Sources:
 .    o   SMSC LAN91C111 databook (www.smsc.com)
 .    o   smc9194.c by Erik Stahlman
 .    o   skeleton.c by Donald Becker ( becker@cesdis.gsfc.nasa.gov )
 .
 . History:
 .	10/17/01  Marco Hasewinkel Modify for DNP/1110
 .	07/25/01  Woojung Huh      Modify for ADS Bitsy
 .	04/25/01  Daris A Nevil    Initial public release through SMSC
 .	03/16/01  Daris A Nevil    Modified smc9194.c for use with LAN91C111
 ----------------------------------------------------------------------------*/

#include <common.h>
#include <command.h>
#include "smc91111.h"
#include <net.h>

#ifdef CONFIG_DRIVER_SMC91111

/* Use power-down feature of the chip */
#define POWER_DOWN	0

#define NO_AUTOPROBE

static const char version[] =
	"smc91111.c:v1.0 04/25/01 by Daris A Nevil (dnevil@snmc.com)\n";

#define SMC_DEBUG 0

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

/*
 . 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


#if (SMC_DEBUG > 2 )
#define PRINTK3(args...) printf(args)
#else
#define PRINTK3(args...)
#endif

#if SMC_DEBUG > 1
#define PRINTK2(args...) printf(args)
#else
#define PRINTK2(args...)
#endif

#ifdef SMC_DEBUG
#define PRINTK(args...) printf(args)
#else
#define PRINTK(args...)
#endif


/*------------------------------------------------------------------------
 .
 . The internal workings of the driver.  If you are changing anything
 . here with the SMC stuff, you should have the datasheet and know
 . what you are doing.
 .
 -------------------------------------------------------------------------*/
#define CARDNAME "LAN91C111"

/* Memory sizing constant */
#define LAN91C111_MEMORY_MULTIPLIER	(1024*2)

#ifndef CONFIG_SMC91111_BASE
#define CONFIG_SMC91111_BASE 0x20000300
#endif

#define SMC_BASE_ADDRESS CONFIG_SMC91111_BASE

#define SMC_DEV_NAME "SMC91111"
#define SMC_PHY_ADDR 0x0000
#define SMC_ALLOC_MAX_TRY 5
#define SMC_TX_TIMEOUT 30

#define SMC_PHY_CLOCK_DELAY 1000

#define ETH_ZLEN 60

#ifdef  CONFIG_SMC_USE_32_BIT
#define USE_32_BIT  1
#else
#undef USE_32_BIT
#endif
/*-----------------------------------------------------------------
 .
 .  The driver can be entered at any of the following entry points.
 .
 .------------------------------------------------------------------  */

extern int eth_init(bd_t *bd);
extern void eth_halt(void);
extern int eth_rx(void);
extern int eth_send(volatile void *packet, int length);





/*
 . 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(void);

/*
 . This is called by  unregister_netdev().  It is responsible for
 . cleaning up before the driver is finally unregistered and discarded.
*/
void smc_destructor(void);

/*
 . The kernel calls this function when someone wants to use the device,
 . typically 'ifconfig ethX up'.
*/
static int smc_open(void);


/*
 . 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(void);

/*
 . Configures the PHY through the MII Management interface
*/
#ifndef CONFIG_SMC91111_EXT_PHY
static void smc_phy_configure(void);
#endif /* !CONFIG_SMC91111_EXT_PHY */

/*
 . This is a separate procedure to handle the receipt of a packet, to
 . leave the interrupt code looking slightly cleaner
*/
static int smc_rcv(void);



/*
 ------------------------------------------------------------
 .
 . Internal routines
 .
 ------------------------------------------------------------
*/

static char smc_mac_addr[] = {0x02, 0x80, 0xad, 0x20, 0x31, 0xb8};

/*
 * This function must be called before smc_open() if you want to override
 * the default mac address.
 */

void smc_set_mac_addr(const char *addr) {
	int i;

	for (i=0; i < sizeof(smc_mac_addr); i++){
		smc_mac_addr[i] = addr[i];
	}
}

/*
 * smc_get_macaddr is no longer used. If you want to override the default
 * mac address, call smc_get_mac_addr as a part of the board initialisation.
 */

#if 0
void smc_get_macaddr( byte *addr ) {
	/* MAC ADDRESS AT FLASHBLOCK 1 / OFFSET 0x10 */
        unsigned char *dnp1110_mac = (unsigned char *) (0xE8000000 + 0x20010);
	int i;


        for (i=0; i<6; i++) {
            addr[0] = *(dnp1110_mac+0);
            addr[1] = *(dnp1110_mac+1);
            addr[2] = *(dnp1110_mac+2);
            addr[3] = *(dnp1110_mac+3);
            addr[4] = *(dnp1110_mac+4);
            addr[5] = *(dnp1110_mac+5);
        }
}
#endif /* 0 */

/***********************************************
 * Show available memory                       *
 ***********************************************/
void dump_memory_info(void)
{
        word mem_info;
        word old_bank;

        old_bank = SMC_inw(BANK_SELECT)&0xF;

        SMC_SELECT_BANK(0);
        mem_info = SMC_inw( MIR_REG );
        PRINTK2("Memory: %4d available\n", (mem_info >> 8)*2048);

        SMC_SELECT_BANK(old_bank);
}
/*
 . 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 does a soft reset on the device */
static void smc_reset( void );

/* Enable Interrupts, Receive, and Transmit */
static void smc_enable( void );

/* this puts the device in an inactive state */
static void smc_shutdown( void );

/* Routines to Read and Write the PHY Registers across the
   MII Management Interface
*/

#ifndef CONFIG_SMC91111_EXT_PHY
static word smc_read_phy_register(byte phyreg);
static void smc_write_phy_register(byte phyreg, word phydata);
#endif /* !CONFIG_SMC91111_EXT_PHY */


static int poll4int( byte mask, int timeout ) {
    int tmo = get_timer(0) + timeout * CFG_HZ;
    int is_timeout = 0;
    word old_bank = SMC_inw(BSR_REG);

    PRINTK2("Polling...\n");
    SMC_SELECT_BANK(2);
    while((SMC_inw(SMC91111_INT_REG) & mask) == 0)
    {
        if (get_timer(0) >= tmo) {
	  is_timeout = 1;
          break;
	}
    }

    /* restore old bank selection */
    SMC_SELECT_BANK(old_bank);

    if (is_timeout)
	return 1;
    else
	return 0;
}

/* Only one release command at a time, please */
static inline void smc_wait_mmu_release_complete(void)
{
	int count = 0;
	/* assume bank 2 selected */
	while ( SMC_inw(MMU_CMD_REG) & MC_BUSY ) {
		udelay(1); // Wait until not busy
		if( ++count > 200) break;
	}
}

/*
 . Function: smc_reset( void )
 . Purpose:
 .  	This sets the SMC91111 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?  SOFTRST  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( void )
{
	PRINTK2("%s:smc_reset\n", SMC_DEV_NAME);

	/* This resets the registers mostly to defaults, but doesn't
	   affect EEPROM.  That seems unnecessary */
	SMC_SELECT_BANK( 0 );
	SMC_outw( RCR_SOFTRST, RCR_REG );

	/* Setup the Configuration Register */
	/* This is necessary because the CONFIG_REG is not affected */
	/* by a soft reset */

	SMC_SELECT_BANK( 1 );
#if defined(CONFIG_SMC91111_EXT_PHY)
	SMC_outw( CONFIG_DEFAULT | CONFIG_EXT_PHY, CONFIG_REG);
#else
	SMC_outw( CONFIG_DEFAULT, CONFIG_REG);
#endif


	/* Release from possible power-down state */
	/* Configuration register is not affected by Soft Reset */
	SMC_outw( SMC_inw( CONFIG_REG ) | CONFIG_EPH_POWER_EN, CONFIG_REG  );

	SMC_SELECT_BANK( 0 );

	/* this should pause enough for the chip to be happy */
	udelay(10);

	/* Disable transmit and receive functionality */
	SMC_outw( RCR_CLEAR, RCR_REG );
	SMC_outw( TCR_CLEAR, TCR_REG );

	/* set the control register */
	SMC_SELECT_BANK( 1 );
	SMC_outw( CTL_DEFAULT, CTL_REG );

	/* Reset the MMU */
	SMC_SELECT_BANK( 2 );
	smc_wait_mmu_release_complete();
	SMC_outw( MC_RESET, MMU_CMD_REG );
	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(1); /* Wait until not busy */

	/* 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 */

	/* Disable all interrupts */
	SMC_outb( 0, IM_REG );
}

/*
 . 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()
{
	PRINTK2("%s:smc_enable\n", SMC_DEV_NAME);
	SMC_SELECT_BANK( 0 );
	/* see the header file for options in TCR/RCR DEFAULT*/
	SMC_outw( TCR_DEFAULT, TCR_REG );
	SMC_outw( RCR_DEFAULT, RCR_REG );

	/* clear MII_DIS */
/*	smc_write_phy_register(PHY_CNTL_REG, 0x0000); */
}

/*
 . 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()
{
	PRINTK2(CARDNAME ":smc_shutdown\n");

	/* no more interrupts for me */
	SMC_SELECT_BANK( 2 );
	SMC_outb( 0, IM_REG );

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK( 0 );
	SMC_outb( RCR_CLEAR, RCR_REG );
	SMC_outb( TCR_CLEAR, TCR_REG );
}


/*
 . 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 int smc_send_packet(volatile void *packet, int packet_length)
{
	byte	 		packet_no;
	unsigned long		ioaddr;
	byte			* buf;
	int			length;
	int			numPages;
	int			try = 0;
	int			time_out;
	byte			status;


	PRINTK3("%s:smc_hardware_send_packet\n", SMC_DEV_NAME);

	length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;

	/* allocate memory
	** 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 :) )
	**
	** The 91C111 ignores the size bits, but the code is left intact
	** for backwards and future compatibility.
	**
	** Pkt size for allocating is data length +6 (for additional status
	** words, length and ctl!)
	**
	** If odd size then last byte is included in this header.
	*/
	numPages =   ((length & 0xfffe) + 6);
	numPages >>= 8; /* Divide by 256 */

	if (numPages > 7 ) {
		printf("%s: Far too big packet error. \n", SMC_DEV_NAME);
		return 0;
	}

	/* now, try to allocate the memory */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_ALLOC | numPages, MMU_CMD_REG );

	/* FIXME: the ALLOC_INT bit never gets set *
	 * so the following will always give a     *
	 * memory allocation error.                *
	 * same code works in armboot though       *
	 * -ro
	 */

again:
	try++;
	time_out = MEMORY_WAIT_TIME;
	do {
		status = SMC_inb( SMC91111_INT_REG );
		if ( status & IM_ALLOC_INT ) {
			/* acknowledge the interrupt */
			SMC_outb( IM_ALLOC_INT, SMC91111_INT_REG );
  			break;
		}
   	} while ( -- time_out );

   	if ( !time_out ) {
			PRINTK2("%s: memory allocation, try %d failed ...\n",
				SMC_DEV_NAME, try);
			if (try < SMC_ALLOC_MAX_TRY)
				goto again;
			else
				return 0;
	}

	PRINTK2("%s: memory allocation, try %d succeeded ...\n",
		SMC_DEV_NAME,
		try);

	/* I can send the packet now.. */

	ioaddr = SMC_BASE_ADDRESS;

	buf = (byte *)packet;

	/* If I get here, I _know_ there is a packet slot waiting for me */
	packet_no = SMC_inb( AR_REG );
	if ( packet_no & AR_FAILED ) {
		/* or isn't there?  BAD CHIP! */
		printf("%s: Memory allocation failed. \n",
			SMC_DEV_NAME);
		return 0;
	}

	/* we have a packet address, so tell the card to use it */
	SMC_outb( packet_no, PN_REG );

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

   	PRINTK3("%s: Trying to xmit packet of length %x\n",
		SMC_DEV_NAME, length);

#if SMC_DEBUG > 2
	printf("Transmitting Packet\n");
	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 , SMC91111_DATA_REG );
#else
	SMC_outw( 0, SMC91111_DATA_REG );
	/* send the packet length ( +6 for status words, length, and ctl*/
	SMC_outw( (length+6), SMC91111_DATA_REG );
#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
	SMC_outsl(SMC91111_DATA_REG, buf,  length >> 2 );
	if ( length & 0x2  )
		SMC_outw(*((word *)(buf + (length & 0xFFFFFFFC))), SMC91111_DATA_REG);
#else
	SMC_outsw(SMC91111_DATA_REG , buf, (length ) >> 1);
#endif /* USE_32_BIT */

	/* Send the last byte, if there is one.   */
	if ( (length & 1) == 0 ) {
		SMC_outw( 0, SMC91111_DATA_REG );
	} else {
		SMC_outw( buf[length -1 ] | 0x2000, SMC91111_DATA_REG );
	}

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

	/* poll for TX INT */
	if (poll4int(IM_TX_INT, SMC_TX_TIMEOUT)) {
		/* sending failed */
		PRINTK2("%s: TX timeout, sending failed...\n",
			SMC_DEV_NAME);

		/* release packet */
	        SMC_outw(MC_FREEPKT, MMU_CMD_REG);

        	/* wait for MMU getting ready (low) */
	        while (SMC_inw(MMU_CMD_REG) & MC_BUSY)
        	{
                	udelay(10);
	        }

        	PRINTK2("MMU ready\n");


		return 0;
	} else {
		/* ack. int */
		SMC_outw(IM_TX_INT, SMC91111_INT_REG);
		PRINTK2("%s: Sent packet of length %d \n", SMC_DEV_NAME, length);

		/* release packet */
	        SMC_outw(MC_FREEPKT, MMU_CMD_REG);

        	/* wait for MMU getting ready (low) */
	        while (SMC_inw(MMU_CMD_REG) & MC_BUSY)
        	{
                	udelay(10);
	        }

        	PRINTK2("MMU ready\n");


	}

	return length;
}

/*-------------------------------------------------------------------------
 |
 | smc_destructor( struct net_device * dev )
 |   Input parameters:
 |	dev, pointer to the device structure
 |
 |   Output:
 |	None.
 |
 ---------------------------------------------------------------------------
*/
void smc_destructor()
{
	PRINTK2(CARDNAME ":smc_destructor\n");
}


/*
 * Open and Initialize the board
 *
 * Set up everything, reset the card, etc ..
 *
 */
static int smc_open()
{
	int	i;	/* used to set hw ethernet address */

	PRINTK2("%s:smc_open\n", SMC_DEV_NAME);

	/* reset the hardware */

	smc_reset();
	smc_enable();

	/* Configure the PHY */
#ifndef CONFIG_SMC91111_EXT_PHY
	smc_phy_configure();
#endif


	/* conservative setting (10Mbps, HalfDuplex, no AutoNeg.) */
/*	SMC_SELECT_BANK(0); */
/*	SMC_outw(0, RPC_REG); */

	SMC_SELECT_BANK(1);

#ifdef USE_32_BIT
	for ( i = 0; i < 6; i += 2 ) {
		word address;

		address = smc_mac_addr[ i + 1 ] << 8 ;
		address  |= smc_mac_addr[ i ];
		SMC_outw( address, ADDR0_REG + i );
	}
#else
	for ( i = 0; i < 6; i ++ )
		SMC_outb( smc_mac_addr[i], ADDR0_REG + i );
#endif

	return 0;
}

#if 0 /* dead code? -- wd */
#ifdef USE_32_BIT
void
insl32(r,b,l)
{
   int __i ;
   dword *__b2;

	__b2 = (dword *) b;
	for (__i = 0; __i < l; __i++) {
		  *(__b2 + __i) = *(dword *)(r+0x10000300);
	}
}
#endif
#endif

/*-------------------------------------------------------------
 .
 . 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 int smc_rcv()
{
	int 	packet_number;
	word	status;
	word	packet_length;
	int     is_error = 0;
#ifdef USE_32_BIT
	dword stat_len;
#endif


	SMC_SELECT_BANK(2);
	packet_number = SMC_inw( RXFIFO_REG );

	if ( packet_number & RXFIFO_REMPTY ) {

		return 0;
	}

	PRINTK3("%s:smc_rcv\n", SMC_DEV_NAME);
	/*  start reading from the start of the packet */
	SMC_outw( PTR_READ | PTR_RCV | PTR_AUTOINC, PTR_REG );

	/* First two words are status and packet_length */
#ifdef USE_32_BIT
	stat_len = SMC_inl(SMC91111_DATA_REG);
	status = stat_len & 0xffff;
	packet_length = stat_len >> 16;
#else
	status 		= SMC_inw( SMC91111_DATA_REG );
	packet_length 	= SMC_inw( SMC91111_DATA_REG );
#endif

	packet_length &= 0x07ff;  /* mask off top bits */

	PRINTK2("RCV: STATUS %4x LENGTH %4x\n", status, packet_length );

	if ( !(status & RS_ERRORS ) ){
		/* Adjust for having already read the first two words */
		packet_length -= 4; /*4; */



		/* set odd length for bug in LAN91C111, */
		/* which never sets RS_ODDFRAME */
		/* TODO ? */


#ifdef USE_32_BIT
		PRINTK3(" Reading %d dwords (and %d bytes) \n",
			packet_length >> 2, packet_length & 3 );
		/* 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  */
		SMC_insl( SMC91111_DATA_REG , NetRxPackets[0], packet_length >> 2 );
		/* read the left over bytes */
		if (packet_length & 3) {
			int i;

			byte *tail = (byte *)(NetRxPackets[0] + (packet_length & ~3));
			dword leftover = SMC_inl(SMC91111_DATA_REG);
			for (i=0; i<(packet_length & 3); i++)
				*tail++ = (byte) (leftover >> (8*i)) & 0xff;
		}
#else
		PRINTK3(" Reading %d words and %d byte(s) \n",
			(packet_length >> 1 ), packet_length & 1 );
		SMC_insw(SMC91111_DATA_REG , NetRxPackets[0], packet_length >> 1);

#endif /* USE_32_BIT */

#if	SMC_DEBUG > 2
		printf("Receiving Packet\n");
		print_packet( NetRxPackets[0], packet_length );
#endif
	} else {
		/* error ... */
		/* TODO ? */
		is_error = 1;
	}

	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(1); /* Wait until not busy */

	/*  error or good, tell the card to get rid of this packet */
	SMC_outw( MC_RELEASE, MMU_CMD_REG );

	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(1); /* Wait until not busy */

	if (!is_error) {
		/* Pass the packet up to the protocol layers. */
		NetReceive(NetRxPackets[0], packet_length);
		return packet_length;
	} else {
		return 0;
	}

}



/*----------------------------------------------------
 . 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()
{
	PRINTK2("%s:smc_close\n", SMC_DEV_NAME);

	/* clear everything */
	smc_shutdown();

	return 0;
}


#if 0
/*------------------------------------------------------------
 . Modify a bit in the LAN91C111 register set
 .-------------------------------------------------------------*/
static word smc_modify_regbit(int bank, int ioaddr, int reg,
	unsigned int bit, int val)
{
	word regval;

	SMC_SELECT_BANK( bank );

	regval = SMC_inw( reg );
	if (val)
		regval |= bit;
	else
		regval &= ~bit;

	SMC_outw( regval, 0 );
	return(regval);
}


/*------------------------------------------------------------
 . Retrieve a bit in the LAN91C111 register set
 .-------------------------------------------------------------*/
static int smc_get_regbit(int bank, int ioaddr, int reg, unsigned int bit)
{
	SMC_SELECT_BANK( bank );
	if ( SMC_inw( reg ) & bit)
		return(1);
	else
		return(0);
}


/*------------------------------------------------------------
 . Modify a LAN91C111 register (word access only)
 .-------------------------------------------------------------*/
static void smc_modify_reg(int bank, int ioaddr, int reg, word val)
{
	SMC_SELECT_BANK( bank );
	SMC_outw( val, reg );
}


/*------------------------------------------------------------
 . Retrieve a LAN91C111 register (word access only)
 .-------------------------------------------------------------*/
static int smc_get_reg(int bank, int ioaddr, int reg)
{
	SMC_SELECT_BANK( bank );
	return(SMC_inw( reg ));
}

#endif /* 0 */

/*---PHY CONTROL AND CONFIGURATION----------------------------------------- */

#if (SMC_DEBUG > 2 )

/*------------------------------------------------------------
 . Debugging function for viewing MII Management serial bitstream
 .-------------------------------------------------------------*/
static void smc_dump_mii_stream(byte* bits, int size)
{
	int i;

	printf("BIT#:");
	for (i = 0; i < size; ++i)
		{
		printf("%d", i%10);
		}

	printf("\nMDOE:");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDOE)
			printf("1");
		else
			printf("0");
		}

	printf("\nMDO :");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDO)
			printf("1");
		else
			printf("0");
		}

	printf("\nMDI :");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDI)
			printf("1");
		else
			printf("0");
		}

	printf("\n");
}
#endif

/*------------------------------------------------------------
 . Reads a register from the MII Management serial interface
 .-------------------------------------------------------------*/
#ifndef CONFIG_SMC91111_EXT_PHY
static word smc_read_phy_register(byte phyreg)
{
	int oldBank;
	int i;
	byte mask;
	word mii_reg;
	byte bits[64];
	int clk_idx = 0;
	int input_idx;
	word phydata;
	byte phyaddr = SMC_PHY_ADDR;

	/* 32 consecutive ones on MDO to establish sync */
	for (i = 0; i < 32; ++i)
		bits[clk_idx++] = MII_MDOE | MII_MDO;

	/* Start code <01> */
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	/* Read command <10> */
	bits[clk_idx++] = MII_MDOE | MII_MDO;
	bits[clk_idx++] = MII_MDOE;

	/* Output the PHY address, msb first */
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyaddr & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		/* Shift to next lowest bit */
		mask >>= 1;
		}

	/* Output the phy register number, msb first */
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyreg & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		/* Shift to next lowest bit */
		mask >>= 1;
		}

	/* Tristate and turnaround (2 bit times) */
	bits[clk_idx++] = 0;
	/*bits[clk_idx++] = 0; */

	/* Input starts at this bit time */
	input_idx = clk_idx;

	/* Will input 16 bits */
	for (i = 0; i < 16; ++i)
		bits[clk_idx++] = 0;

	/* Final clock bit */
	bits[clk_idx++] = 0;

	/* Save the current bank */
	oldBank = SMC_inw( BANK_SELECT );

	/* Select bank 3 */
	SMC_SELECT_BANK( 3 );

	/* Get the current MII register value */
	mii_reg = SMC_inw( MII_REG );

	/* Turn off all MII Interface bits */
	mii_reg &= ~(MII_MDOE|MII_MCLK|MII_MDI|MII_MDO);

	/* Clock all 64 cycles */
	for (i = 0; i < sizeof bits; ++i)
		{
		/* Clock Low - output data */
		SMC_outw( mii_reg | bits[i], MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);


		/* Clock Hi - input data */
		SMC_outw( mii_reg | bits[i] | MII_MCLK, MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);
		bits[i] |= SMC_inw( MII_REG ) & MII_MDI;
		}

	/* Return to idle state */
	/* Set clock to low, data to low, and output tristated */
	SMC_outw( mii_reg, MII_REG );
	udelay(SMC_PHY_CLOCK_DELAY);

	/* Restore original bank select */
	SMC_SELECT_BANK( oldBank );

	/* Recover input data */
	phydata = 0;
	for (i = 0; i < 16; ++i)
		{
		phydata <<= 1;

		if (bits[input_idx++] & MII_MDI)
			phydata |= 0x0001;
		}

#if (SMC_DEBUG > 2 )
	printf("smc_read_phy_register(): phyaddr=%x,phyreg=%x,phydata=%x\n",
		phyaddr, phyreg, phydata);
	smc_dump_mii_stream(bits, sizeof bits);
#endif

	return(phydata);
}


/*------------------------------------------------------------
 . Writes a register to the MII Management serial interface
 .-------------------------------------------------------------*/
static void smc_write_phy_register(byte phyreg, word phydata)
{
	int oldBank;
	int i;
	word mask;
	word mii_reg;
	byte bits[65];
	int clk_idx = 0;
	byte phyaddr = SMC_PHY_ADDR;

	/* 32 consecutive ones on MDO to establish sync */
	for (i = 0; i < 32; ++i)
		bits[clk_idx++] = MII_MDOE | MII_MDO;

	/* Start code <01> */
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	/* Write command <01> */
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	/* Output the PHY address, msb first */
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyaddr & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		/* Shift to next lowest bit */
		mask >>= 1;
		}

	/* Output the phy register number, msb first */
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyreg & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		/* Shift to next lowest bit */
		mask >>= 1;
		}

	/* Tristate and turnaround (2 bit times) */
	bits[clk_idx++] = 0;
	bits[clk_idx++] = 0;

	/* Write out 16 bits of data, msb first */
	mask = 0x8000;
	for (i = 0; i < 16; ++i)
		{
		if (phydata & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		/* Shift to next lowest bit */
		mask >>= 1;
		}

	/* Final clock bit (tristate) */
	bits[clk_idx++] = 0;

	/* Save the current bank */
	oldBank = SMC_inw( BANK_SELECT );

	/* Select bank 3 */
	SMC_SELECT_BANK( 3 );

	/* Get the current MII register value */
	mii_reg = SMC_inw( MII_REG );

	/* Turn off all MII Interface bits */
	mii_reg &= ~(MII_MDOE|MII_MCLK|MII_MDI|MII_MDO);

	/* Clock all cycles */
	for (i = 0; i < sizeof bits; ++i)
		{
		/* Clock Low - output data */
		SMC_outw( mii_reg | bits[i], MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);


		/* Clock Hi - input data */
		SMC_outw( mii_reg | bits[i] | MII_MCLK, MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);
		bits[i] |= SMC_inw( MII_REG ) & MII_MDI;
		}

	/* Return to idle state */
	/* Set clock to low, data to low, and output tristated */
	SMC_outw( mii_reg, MII_REG );
	udelay(SMC_PHY_CLOCK_DELAY);

	/* Restore original bank select */
	SMC_SELECT_BANK( oldBank );

#if (SMC_DEBUG > 2 )
	printf("smc_write_phy_register(): phyaddr=%x,phyreg=%x,phydata=%x\n",
		phyaddr, phyreg, phydata);
	smc_dump_mii_stream(bits, sizeof bits);
#endif
}
#endif /* !CONFIG_SMC91111_EXT_PHY */



/*------------------------------------------------------------
 . Waits the specified number of milliseconds - kernel friendly
 .-------------------------------------------------------------*/
#ifndef CONFIG_SMC91111_EXT_PHY
static void smc_wait_ms(unsigned int ms)
{
	udelay(ms*1000);
}
#endif /* !CONFIG_SMC91111_EXT_PHY */



/*------------------------------------------------------------
 . Configures the specified PHY using Autonegotiation. Calls
 . smc_phy_fixed() if the user has requested a certain config.
 .-------------------------------------------------------------*/
#ifndef CONFIG_SMC91111_EXT_PHY
static void smc_phy_configure()
{
	int timeout;
	byte phyaddr;
	word my_phy_caps; /* My PHY capabilities */
	word my_ad_caps;  /* My Advertised capabilities */
	word status = 0;  /*;my status = 0 */
	int failed = 0;

	PRINTK3("%s:smc_program_phy()\n", SMC_DEV_NAME);



	/* Get the detected phy address */
	phyaddr = SMC_PHY_ADDR;

	/* Reset the PHY, setting all other bits to zero */
	smc_write_phy_register(PHY_CNTL_REG, PHY_CNTL_RST);

	/* Wait for the reset to complete, or time out */
	timeout = 6; /* Wait up to 3 seconds */
	while (timeout--)
		{
		if (!(smc_read_phy_register(PHY_CNTL_REG)
		    & PHY_CNTL_RST))
			{
			/* reset complete */
			break;
			}

		smc_wait_ms(500); /* wait 500 millisecs */
		}

	if (timeout < 1)
		{
		printf("%s:PHY reset timed out\n", SMC_DEV_NAME);
		goto smc_phy_configure_exit;
		}

	/* Read PHY Register 18, Status Output */
	/* lp->lastPhy18 = smc_read_phy_register(PHY_INT_REG); */

	/* Enable PHY Interrupts (for register 18) */
	/* Interrupts listed here are disabled */
	smc_write_phy_register(PHY_INT_REG, 0xffff);

	/* Configure the Receive/Phy Control register */
	SMC_SELECT_BANK( 0 );
	SMC_outw( RPC_DEFAULT, RPC_REG );

	/* Copy our capabilities from PHY_STAT_REG to PHY_AD_REG */
	my_phy_caps = smc_read_phy_register(PHY_STAT_REG);
	my_ad_caps  = PHY_AD_CSMA; /* I am CSMA capable */

	if (my_phy_caps & PHY_STAT_CAP_T4)
		my_ad_caps |= PHY_AD_T4;

	if (my_phy_caps & PHY_STAT_CAP_TXF)
		my_ad_caps |= PHY_AD_TX_FDX;

	if (my_phy_caps & PHY_STAT_CAP_TXH)
		my_ad_caps |= PHY_AD_TX_HDX;

	if (my_phy_caps & PHY_STAT_CAP_TF)
		my_ad_caps |= PHY_AD_10_FDX;

	if (my_phy_caps & PHY_STAT_CAP_TH)
		my_ad_caps |= PHY_AD_10_HDX;

	/* Update our Auto-Neg Advertisement Register */
	smc_write_phy_register( PHY_AD_REG, my_ad_caps);

	PRINTK2("%s:phy caps=%x\n", SMC_DEV_NAME, my_phy_caps);
	PRINTK2("%s:phy advertised caps=%x\n", SMC_DEV_NAME, my_ad_caps);

	/* Restart auto-negotiation process in order to advertise my caps */
	smc_write_phy_register( PHY_CNTL_REG,
		PHY_CNTL_ANEG_EN | PHY_CNTL_ANEG_RST );

	/* Wait for the auto-negotiation to complete.  This may take from */
	/* 2 to 3 seconds. */
	/* Wait for the reset to complete, or time out */
	timeout = 20; /* Wait up to 10 seconds */
	while (timeout--)
		{
		status = smc_read_phy_register( PHY_STAT_REG);
		if (status & PHY_STAT_ANEG_ACK)
			{
			/* auto-negotiate complete */
			break;
			}

		smc_wait_ms(500); /* wait 500 millisecs */

		/* Restart auto-negotiation if remote fault */
		if (status & PHY_STAT_REM_FLT)
			{
			printf("%s:PHY remote fault detected\n", SMC_DEV_NAME);

			/* Restart auto-negotiation */
			printf("%s:PHY restarting auto-negotiation\n",
				SMC_DEV_NAME);
			smc_write_phy_register( PHY_CNTL_REG,
				PHY_CNTL_ANEG_EN | PHY_CNTL_ANEG_RST |
				PHY_CNTL_SPEED | PHY_CNTL_DPLX);
			}
		}

	if (timeout < 1)
		{
		printf("%s:PHY auto-negotiate timed out\n",
			SMC_DEV_NAME);
		printf("%s:PHY auto-negotiate timed out\n", SMC_DEV_NAME);
		failed = 1;
		}

	/* Fail if we detected an auto-negotiate remote fault */
	if (status & PHY_STAT_REM_FLT)
		{
		printf( "%s:PHY remote fault detected\n", SMC_DEV_NAME);
		printf("%s:PHY remote fault detected\n", SMC_DEV_NAME);
		failed = 1;
		}

	/* Re-Configure the Receive/Phy Control register */
	SMC_outw( RPC_DEFAULT, RPC_REG );

  smc_phy_configure_exit:

}
#endif /* !CONFIG_SMC91111_EXT_PHY */


#if SMC_DEBUG > 2
static void print_packet( byte * buf, int length )
{
#if 0
        int i;
        int remainder;
        int lines;

        printf("Packet of length %d \n", length );

#if SMC_DEBUG > 3
        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 ++ );
                        printf("%02x%02x ", a, b );
                }
                printf("\n");
        }
        for ( i = 0; i < remainder/2 ; i++ ) {
                byte a, b;

                a = *(buf ++ );
                b = *(buf ++ );
                printf("%02x%02x ", a, b );
        }
        printf("\n");
#endif
#endif
}
#endif

int eth_init(bd_t *bd) {
	smc_open();
	return 0;
}

void eth_halt() {
	smc_close();
}

int eth_rx() {
	return smc_rcv();
}

int eth_send(volatile void *packet, int length) {
	return smc_send_packet(packet, length);
}

#endif /* CONFIG_DRIVER_SMC91111 */