Patch by Mathijs Haarman, 08 May 2003:

Add lan91c96 driver (tested on Lubbock and custom PXA250 board only)

1 files changed, 858 insertions, 0 deletions

diff --git a/drivers/lan91c96.c b/drivers/lan91c96.c
new file mode 100644
index 0000000..76b0c53
--- /dev/null
+++ b/drivers/lan91c96.c
@@ -0,0 +1,858 @@
+/*------------------------------------------------------------------------
+ * lan91c96.c
+ * This is a driver for SMSC's LAN91C96 single-chip Ethernet device, based
+ * on the SMC91111 driver from U-boot.
+ *
+ * (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 LAN91C96
+ * 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:
+ *   6144 byte packet memory. ( for the 91C96 )
+ *   EEPROM for configuration
+ *   AUI/TP selection  ( mine has 10Base2/10BaseT select )
+ *
+ * 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 LAN91C96 databook (www.smsc.com)
+ *    o   smc91111.c (u-boot driver)
+ *    o   smc9194.c (linux kernel driver)
+ *    o   lan91c96.c (Intel Diagnostic Manager driver)
+ *
+ * History:
+ * 	04/30/03  Mathijs Haarman	Modified smc91111.c (u-boot version)
+ *					for lan91c96
+ *---------------------------------------------------------------------------
+ */
+
+#include <common.h>
+#include <command.h>
+#include "lan91c96.h"
+#include <net.h>
+
+#ifdef CONFIG_DRIVER_LAN91C96
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+/*------------------------------------------------------------------------
+ *
+ * Configuration options, for the experienced user to change.
+ *
+ -------------------------------------------------------------------------*/
+
+/* Use power-down feature of the chip */
+#define POWER_DOWN	0
+
+/*
+ * Wait time for memory to be free.  This probably shouldn't be
+ * tuned that much, as waiting for this means nothing else happens
+ * in the system
+*/
+#define MEMORY_WAIT_TIME 16
+
+#define SMC_DEBUG 0
+
+#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 "LAN91C96"
+
+#define SMC_BASE_ADDRESS CONFIG_LAN91C96_BASE
+
+#define SMC_DEV_NAME "LAN91C96"
+#define SMC_ALLOC_MAX_TRY 5
+#define SMC_TX_TIMEOUT 30
+
+#define ETH_ZLEN 60
+
+#ifdef  CONFIG_LAN91C96_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);
+static int smc_hw_init (void);
+
+/*
+ * 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);
+
+/*
+ * 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[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c };
+
+/*
+ * 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 (LAN91C96_BANK_SELECT) & 0xF;
+
+	SMC_SELECT_BANK (0);
+	mem_info = SMC_inw (LAN91C96_MIR);
+	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);
+
+
+static int poll4int (byte mask, int timeout)
+{
+	int tmo = get_timer (0) + timeout * CFG_HZ;
+	int is_timeout = 0;
+	word old_bank = SMC_inw (LAN91C96_BANK_SELECT);
+
+	PRINTK2 ("Polling...\n");
+	SMC_SELECT_BANK (2);
+	while ((SMC_inw (LAN91C96_INT_STATS) & 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;
+}
+
+/*
+ * 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 (LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);
+
+	udelay (10);
+
+	/* Disable transmit and receive functionality */
+	SMC_outw (0, LAN91C96_RCR);
+	SMC_outw (0, LAN91C96_TCR);
+
+	/* set the control register */
+	SMC_SELECT_BANK (1);
+	SMC_outw (SMC_inw (LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
+			  LAN91C96_CONTROL);
+
+	/* Disable all interrupts */
+	SMC_outb (0, LAN91C96_INT_MASK);
+}
+
+/*
+ * Function: smc_enable
+ * Purpose: let the chip talk to the outside work
+ * Method:
+ *	1.  Initialize the Memory Configuration Register
+ *	2.  Enable the transmitter
+ *	3.  Enable the receiver
+*/
+static void smc_enable ()
+{
+	PRINTK2 ("%s:smc_enable\n", SMC_DEV_NAME);
+	SMC_SELECT_BANK (0);
+
+	/* Initialize the Memory Configuration Register. See page
+	   49 of the LAN91C96 data sheet for details. */
+	SMC_outw (LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);
+
+	/* Initialize the Transmit Control Register */
+	SMC_outw (LAN91C96_TCR_TXENA, LAN91C96_TCR);
+	/* Initialize the Receive Control Register
+	 * FIXME:
+	 * The promiscuous bit set because I could not receive ARP reply
+	 * packets from the server when I send a ARP request. It only works
+	 * when I set the promiscuous bit
+	 */
+	SMC_outw (LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR);
+}
+
+/*
+ * 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, LAN91C96_INT_MASK);
+
+	/* and tell the card to stay away from that nasty outside world */
+	SMC_SELECT_BANK (0);
+	SMC_outb (0, LAN91C96_RCR);
+	SMC_outb (0, LAN91C96_TCR);
+}
+
+
+/*
+ * 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 (LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);
+
+  again:
+	try++;
+	time_out = MEMORY_WAIT_TIME;
+	do {
+		status = SMC_inb (LAN91C96_INT_STATS);
+		if (status & LAN91C96_IST_ALLOC_INT) {
+
+			SMC_outb (LAN91C96_IST_ALLOC_INT, LAN91C96_INT_STATS);
+			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 (LAN91C96_ARR);
+	if (packet_no & LAN91C96_ARR_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, LAN91C96_PNR);
+
+	/* point to the beginning of the packet */
+	SMC_outw (LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
+
+	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, LAN91C96_DATA_HIGH);
+#else
+	SMC_outw (0, LAN91C96_DATA_HIGH);
+	/* send the packet length ( +6 for status words, length, and ctl */
+	SMC_outw ((length + 6), LAN91C96_DATA_HIGH);
+#endif /* 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?
+	 */
+#ifdef USE_32_BIT
+	SMC_outsl (LAN91C96_DATA_HIGH, buf, length >> 2);
+	if (length & 0x2)
+		SMC_outw (*((word *) (buf + (length & 0xFFFFFFFC))),
+				  LAN91C96_DATA_HIGH);
+#else
+	SMC_outsw (LAN91C96_DATA_HIGH, buf, (length) >> 1);
+#endif /* USE_32_BIT */
+
+	/* Send the last byte, if there is one.   */
+	if ((length & 1) == 0) {
+		SMC_outw (0, LAN91C96_DATA_HIGH);
+	} else {
+		SMC_outw (buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH);
+	}
+
+	/* and let the chipset deal with it */
+	SMC_outw (LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);
+
+	/* poll for TX INT */
+	if (poll4int (LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
+		/* sending failed */
+		PRINTK2 ("%s: TX timeout, sending failed...\n", SMC_DEV_NAME);
+
+		/* release packet */
+		SMC_outw (LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
+
+		/* wait for MMU getting ready (low) */
+		while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) {
+			udelay (10);
+		}
+
+		PRINTK2 ("MMU ready\n");
+
+
+		return 0;
+	} else {
+		/* ack. int */
+		SMC_outw (LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);
+
+		PRINTK2 ("%s: Sent packet of length %d \n", SMC_DEV_NAME, length);
+
+		/* release packet */
+		SMC_outw (LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
+
+		/* wait for MMU getting ready (low) */
+		while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_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 ();
+
+	SMC_SELECT_BANK (1);
+
+	for (i = 0; i < 6; i += 2) {
+		word address;
+
+		address = smc_mac_addr[i + 1] << 8;
+		address |= smc_mac_addr[i];
+		SMC_outw (address, LAN91C96_IA0 + i);
+	}
+	return 0;
+}
+
+/*-------------------------------------------------------------
+ *
+ * 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 (LAN91C96_FIFO);
+
+	if (packet_number & LAN91C96_FIFO_RXEMPTY) {
+		return 0;
+	}
+
+	PRINTK3 ("%s:smc_rcv\n", SMC_DEV_NAME);
+	/*  start reading from the start of the packet */
+	SMC_outw (LAN91C96_PTR_READ | LAN91C96_PTR_RCV |
+			  LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
+
+	/* First two words are status and packet_length */
+#ifdef USE_32_BIT
+	stat_len = SMC_inl (LAN91C96_DATA_HIGH);
+	status = stat_len & 0xffff;
+	packet_length = stat_len >> 16;
+#else
+	status = SMC_inw (LAN91C96_DATA_HIGH);
+	packet_length = SMC_inw (LAN91C96_DATA_HIGH);
+#endif
+
+	packet_length &= 0x07ff;	/* mask off top bits */
+
+	PRINTK2 ("RCV: STATUS %4x LENGTH %4x\n", status, packet_length);
+
+	if (!(status & FRAME_FILTER)) {
+		/* 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 (LAN91C96_DATA_HIGH, 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 (LAN91C96_DATA_HIGH);
+
+			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 (LAN91C96_DATA_HIGH, 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 (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
+		udelay (1);		/* Wait until not busy */
+
+	/*  error or good, tell the card to get rid of this packet */
+	SMC_outw (LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);
+
+	while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_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 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);
+
+	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 /* 0 */
+}
+#endif /* SMC_DEBUG > 2 */
+
+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);
+}
+
+int eth_hw_init ()
+{
+	return smc_hw_init ();
+}
+
+/*-------------------------------------------------------------------------
+ * smc_hw_init()
+ *
+ *   Function:
+ *      Reset and enable the device, check if the I/O space location
+ *      is correct
+ *
+ *   Input parameters:
+ *      None
+ *
+ *   Output:
+ *	0 --> success
+ *	1 --> error
+ *--------------------------------------------------------------------------
+ */
+static int smc_hw_init ()
+{
+	unsigned short status_test;
+
+	/* The attribute register of the LAN91C96 is located at address
+	   0x0e000000 on the lubbock platform */
+	volatile unsigned *attaddr = (unsigned *) (0x0e000000);
+
+	/* first reset, then enable the device. Sequence is critical */
+	attaddr[LAN91C96_ECOR] |= LAN91C96_ECOR_SRESET;
+	udelay (100);
+	attaddr[LAN91C96_ECOR] &= ~LAN91C96_ECOR_SRESET;
+	attaddr[LAN91C96_ECOR] |= LAN91C96_ECOR_ENABLE;
+
+	/* force 16-bit mode */
+	attaddr[LAN91C96_ECSR] &= ~LAN91C96_ECSR_IOIS8;
+	udelay (100);
+
+	/* check if the I/O address is correct, the upper byte of the
+	   bank select register should read 0x33 */
+
+	status_test = SMC_inw (LAN91C96_BANK_SELECT);
+	if ((status_test & 0xFF00) != 0x3300) {
+		printf ("Failed to initialize ethernetchip\n");
+		return 1;
+	}
+	return 0;
+}
+
+#endif /* COMMANDS & CFG_NET */
+
+#endif /* CONFIG_DRIVER_LAN91C96 */