drivers/net/lan91c96.c - uboot/armada - Git at Google

 /*------------------------------------------------------------------------
  * 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 <malloc.h>
 #include "lan91c96.h"
 #include <net.h>
 #include <linux/compiler.h>

 /*------------------------------------------------------------------------
  *
  * 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 DRIVER_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

 /* See if a MAC address is defined in the current environment. If so use it. If not
  . print a warning and set the environment and other globals with the default.
  . If an EEPROM is present it really should be consulted.
 */
 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev);
 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac);

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

 static unsigned 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.
  */

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

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

 /***********************************************
  * Show available memory                       *
  ***********************************************/
 void dump_memory_info(struct eth_device *dev)
 {
 	__maybe_unused word mem_info;
 	word old_bank;

 	old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT) & 0xF;

 	SMC_SELECT_BANK(dev, 0);
 	mem_info = SMC_inw(dev, LAN91C96_MIR);
 	PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);

 	SMC_SELECT_BANK(dev, 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

 static int poll4int (struct eth_device *dev, byte mask, int timeout)
 {
 	int tmo = get_timer (0) + timeout * CONFIG_SYS_HZ;
 	int is_timeout = 0;
 	word old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT);

 	PRINTK2 ("Polling...\n");
 	SMC_SELECT_BANK(dev, 2);
 	while ((SMC_inw(dev, LAN91C96_INT_STATS) & mask) == 0) {
 		if (get_timer (0) >= tmo) {
 			is_timeout = 1;
 			break;
 		}
 	}

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

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

 /*
  * Function: smc_reset
  * 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(struct eth_device *dev)
 {
 	PRINTK2("%s:smc_reset\n", dev->name);

 	/* This resets the registers mostly to defaults, but doesn't
 	   affect EEPROM.  That seems unnecessary */
 	SMC_SELECT_BANK(dev, 0);
 	SMC_outw(dev, LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);

 	udelay (10);

 	/* Disable transmit and receive functionality */
 	SMC_outw(dev, 0, LAN91C96_RCR);
 	SMC_outw(dev, 0, LAN91C96_TCR);

 	/* set the control register */
 	SMC_SELECT_BANK(dev, 1);
 	SMC_outw(dev, SMC_inw(dev, LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
 			  LAN91C96_CONTROL);

 	/* Disable all interrupts */
 	SMC_outb(dev, 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(struct eth_device *dev)
 {
 	PRINTK2("%s:smc_enable\n", dev->name);
 	SMC_SELECT_BANK(dev, 0);

 	/* Initialize the Memory Configuration Register. See page
 	   49 of the LAN91C96 data sheet for details. */
 	SMC_outw(dev, LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);

 	/* Initialize the Transmit Control Register */
 	SMC_outw(dev, 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(dev, 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(struct eth_device *dev)
 {
 	PRINTK2("%s:smc_shutdown\n", dev->name);

 	/* no more interrupts for me */
 	SMC_SELECT_BANK(dev, 2);
 	SMC_outb(dev, 0, LAN91C96_INT_MASK);

 	/* and tell the card to stay away from that nasty outside world */
 	SMC_SELECT_BANK(dev, 0);
 	SMC_outb(dev, 0, LAN91C96_RCR);
 	SMC_outb(dev, 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(struct eth_device *dev, void *packet,
 		int packet_length)
 {
 	byte packet_no;
 	byte *buf;
 	int length;
 	int numPages;
 	int try = 0;
 	int time_out;
 	byte status;


 	PRINTK3("%s:smc_hardware_send_packet\n", 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", dev->name);
 		return 0;
 	}

 	/* now, try to allocate the memory */

 	SMC_SELECT_BANK(dev, 2);
 	SMC_outw(dev, LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);

   again:
 	try++;
 	time_out = MEMORY_WAIT_TIME;
 	do {
 		status = SMC_inb(dev, LAN91C96_INT_STATS);
 		if (status & LAN91C96_IST_ALLOC_INT) {

 			SMC_outb(dev, LAN91C96_IST_ALLOC_INT,
 					LAN91C96_INT_STATS);
 			break;
 		}
 	} while (--time_out);

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

 	PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
 			 dev->name, try);

 	/* I can send the packet now.. */
 	buf = (byte *) packet;

 	/* If I get here, I _know_ there is a packet slot waiting for me */
 	packet_no = SMC_inb(dev, LAN91C96_ARR);
 	if (packet_no & LAN91C96_ARR_FAILED) {
 		/* or isn't there?  BAD CHIP! */
 		printf("%s: Memory allocation failed. \n", dev->name);
 		return 0;
 	}

 	/* we have a packet address, so tell the card to use it */
 	SMC_outb(dev, packet_no, LAN91C96_PNR);

 	/* point to the beginning of the packet */
 	SMC_outw(dev, LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);

 	PRINTK3("%s: Trying to xmit packet of length %x\n",
 			 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(dev, (length + 6) << 16, LAN91C96_DATA_HIGH);
 #else
 	SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
 	/* send the packet length ( +6 for status words, length, and ctl */
 	SMC_outw(dev, (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(dev, LAN91C96_DATA_HIGH, buf, length >> 2);
 	if (length & 0x2)
 		SMC_outw(dev, *((word *) (buf + (length & 0xFFFFFFFC))),
 				  LAN91C96_DATA_HIGH);
 #else
 	SMC_outsw(dev, LAN91C96_DATA_HIGH, buf, (length) >> 1);
 #endif /* USE_32_BIT */

 	/* Send the last byte, if there is one.   */
 	if ((length & 1) == 0) {
 		SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
 	} else {
 		SMC_outw(dev, buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH);
 	}

 	/* and let the chipset deal with it */
 	SMC_outw(dev, LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);

 	/* poll for TX INT */
 	if (poll4int (dev, LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
 		/* sending failed */
 		PRINTK2("%s: TX timeout, sending failed...\n", dev->name);

 		/* release packet */
 		SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);

 		/* wait for MMU getting ready (low) */
 		while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 			udelay (10);

 		PRINTK2("MMU ready\n");


 		return 0;
 	} else {
 		/* ack. int */
 		SMC_outw(dev, LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);

 		PRINTK2("%s: Sent packet of length %d \n", dev->name, length);

 		/* release packet */
 		SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);

 		/* wait for MMU getting ready (low) */
 		while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 			udelay (10);

 		PRINTK2 ("MMU ready\n");
 	}

 	return length;
 }


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

 	PRINTK2("%s:smc_open\n", dev->name);

 	/* reset the hardware */

 	smc_reset(dev);
 	smc_enable(dev);

 	SMC_SELECT_BANK(dev, 1);
 	/* set smc_mac_addr, and sync it with u-boot globals */
 	err = smc_get_ethaddr(bd, dev);
 	if (err < 0)
 		return -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(dev, address, LAN91C96_IA0 + i);
 	}
 #else
 	for (i = 0; i < 6; i++)
 		SMC_outb(dev, smc_mac_addr[i], LAN91C96_IA0 + i);
 #endif
 	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(struct eth_device *dev)
 {
 	int packet_number;
 	word status;
 	word packet_length;
 	int is_error = 0;

 #ifdef USE_32_BIT
 	dword stat_len;
 #endif


 	SMC_SELECT_BANK(dev, 2);
 	packet_number = SMC_inw(dev, LAN91C96_FIFO);

 	if (packet_number & LAN91C96_FIFO_RXEMPTY) {
 		return 0;
 	}

 	PRINTK3("%s:smc_rcv\n", dev->name);
 	/*  start reading from the start of the packet */
 	SMC_outw(dev, 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(dev, LAN91C96_DATA_HIGH);
 	status = stat_len & 0xffff;
 	packet_length = stat_len >> 16;
 #else
 	status = SMC_inw(dev, LAN91C96_DATA_HIGH);
 	packet_length = SMC_inw(dev, 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(dev, 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(dev, 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(dev, LAN91C96_DATA_HIGH, NetRxPackets[0],
 				packet_length >> 1);

 #endif /* USE_32_BIT */

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

 	while (SMC_inw(dev, 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(dev, LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);

 	while (SMC_inw(dev, 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(struct eth_device *dev)
 {
 	PRINTK2("%s:smc_close\n", dev->name);

 	/* clear everything */
 	smc_shutdown(dev);

 	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 */

 static int  lan91c96_init(struct eth_device *dev, bd_t *bd)
 {
 	return smc_open(bd, dev);
 }

 static void lan91c96_halt(struct eth_device *dev)
 {
 	smc_close(dev);
 }

 static int lan91c96_recv(struct eth_device *dev)
 {
 	return smc_rcv(dev);
 }

 static int lan91c96_send(struct eth_device *dev, void *packet,
 		int length)
 {
 	return smc_send_packet(dev, packet, length);
 }

 /* smc_get_ethaddr
  *
  * This checks both the environment and the ROM for an ethernet address. If
  * found, the environment takes precedence.
  */

 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev)
 {
 	uchar v_mac[6];

 	if (!eth_getenv_enetaddr("ethaddr", v_mac)) {
 		/* get ROM mac value if any */
 		if (!get_rom_mac(dev, v_mac)) {
 			printf("\n*** ERROR: ethaddr is NOT set !!\n");
 			return -1;
 		}
 		eth_setenv_enetaddr("ethaddr", v_mac);
 	}

 	smc_set_mac_addr(v_mac); /* use old function to update smc default */
 	PRINTK("Using MAC Address %pM\n", v_mac);
 	return 0;
 }

 /*
  * get_rom_mac()
  * Note, this has omly been tested for the OMAP730 P2.
  */

 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac)
 {
 #ifdef HARDCODE_MAC	/* used for testing or to supress run time warnings */
 	char hw_mac_addr[] = { 0x02, 0x80, 0xad, 0x20, 0x31, 0xb8 };

 	memcpy (v_rom_mac, hw_mac_addr, 6);
 	return (1);
 #else
 	int i;
 	SMC_SELECT_BANK(dev, 1);
 	for (i=0; i<6; i++)
 	{
 		v_rom_mac[i] = SMC_inb(dev, LAN91C96_IA0 + i);
 	}
 	return (1);
 #endif
 }

 /* Structure to detect the device IDs */
 struct id_type {
 	u8 id;
 	char *name;
 };
 static struct id_type supported_chips[] = {
 	{0, ""}, /* Dummy entry to prevent id check failure */
 	{9, "LAN91C110"},
 	{8, "LAN91C100FD"},
 	{7, "LAN91C100"},
 	{5, "LAN91C95"},
 	{4, "LAN91C94/96"},
 	{3, "LAN91C90/92"},
 };
 /* lan91c96_detect_chip
  * See:
  * http://www.embeddedsys.com/subpages/resources/images/documents/LAN91C96_datasheet.pdf
  * page 71 - that is the closest we get to detect this device
  */
 static int lan91c96_detect_chip(struct eth_device *dev)
 {
 	u8 chip_id;
 	int r;
 	SMC_SELECT_BANK(dev, 3);
 	chip_id = (SMC_inw(dev, 0xA) & LAN91C96_REV_CHIPID) >> 4;
 	SMC_SELECT_BANK(dev, 0);
 	for (r = 0; r < sizeof(supported_chips) / sizeof(struct id_type); r++)
 		if (chip_id == supported_chips[r].id)
 			return r;
 	return 0;
 }

 int lan91c96_initialize(u8 dev_num, int base_addr)
 {
 	struct eth_device *dev;
 	int r = 0;

 	dev = malloc(sizeof(*dev));
 	if (!dev) {
 		return 0;
 	}
 	memset(dev, 0, sizeof(*dev));

 	dev->iobase = base_addr;

 	/* Try to detect chip. Will fail if not present. */
 	r = lan91c96_detect_chip(dev);
 	if (!r) {
 		free(dev);
 		return 0;
 	}
 	get_rom_mac(dev, dev->enetaddr);

 	dev->init = lan91c96_init;
 	dev->halt = lan91c96_halt;
 	dev->send = lan91c96_send;
 	dev->recv = lan91c96_recv;
 	sprintf(dev->name, "%s-%hu", supported_chips[r].name, dev_num);

 	eth_register(dev);
 	return 0;
 }
	/*------------------------------------------------------------------------
	* 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 <malloc.h>
	#include "lan91c96.h"
	#include <net.h>
	#include <linux/compiler.h>

	/*------------------------------------------------------------------------
	*
	* 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 DRIVER_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

	/* See if a MAC address is defined in the current environment. If so use it. If not
	. print a warning and set the environment and other globals with the default.
	. If an EEPROM is present it really should be consulted.
	*/
	static int smc_get_ethaddr(bd_t bd, struct eth_device dev);
	static int get_rom_mac(struct eth_device dev, unsigned char v_rom_mac);

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

	static unsigned 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.
	*/

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

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

	/***********************************************
	* Show available memory *
	***********************************************/
	void dump_memory_info(struct eth_device *dev)
	{
	__maybe_unused word mem_info;
	word old_bank;

	old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT) & 0xF;

	SMC_SELECT_BANK(dev, 0);
	mem_info = SMC_inw(dev, LAN91C96_MIR);
	PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);

	SMC_SELECT_BANK(dev, 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

	static int poll4int (struct eth_device *dev, byte mask, int timeout)
	{
	int tmo = get_timer (0) + timeout * CONFIG_SYS_HZ;
	int is_timeout = 0;
	word old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT);

	PRINTK2 ("Polling...\n");
	SMC_SELECT_BANK(dev, 2);
	while ((SMC_inw(dev, LAN91C96_INT_STATS) & mask) == 0) {
	if (get_timer (0) >= tmo) {
	is_timeout = 1;
	break;
	}
	}

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

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

	/*
	* Function: smc_reset
	* 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(struct eth_device *dev)
	{
	PRINTK2("%s:smc_reset\n", dev->name);

	/* This resets the registers mostly to defaults, but doesn't
	affect EEPROM. That seems unnecessary */
	SMC_SELECT_BANK(dev, 0);
	SMC_outw(dev, LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);

	udelay (10);

	/* Disable transmit and receive functionality */
	SMC_outw(dev, 0, LAN91C96_RCR);
	SMC_outw(dev, 0, LAN91C96_TCR);

	/* set the control register */
	SMC_SELECT_BANK(dev, 1);
	SMC_outw(dev, SMC_inw(dev, LAN91C96_CONTROL) \| LAN91C96_CTR_BIT_8,
	LAN91C96_CONTROL);

	/* Disable all interrupts */
	SMC_outb(dev, 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(struct eth_device *dev)
	{
	PRINTK2("%s:smc_enable\n", dev->name);
	SMC_SELECT_BANK(dev, 0);

	/* Initialize the Memory Configuration Register. See page
	49 of the LAN91C96 data sheet for details. */
	SMC_outw(dev, LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);

	/* Initialize the Transmit Control Register */
	SMC_outw(dev, 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(dev, 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(struct eth_device *dev)
	{
	PRINTK2("%s:smc_shutdown\n", dev->name);

	/* no more interrupts for me */
	SMC_SELECT_BANK(dev, 2);
	SMC_outb(dev, 0, LAN91C96_INT_MASK);

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK(dev, 0);
	SMC_outb(dev, 0, LAN91C96_RCR);
	SMC_outb(dev, 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(struct eth_device dev, void packet,
	int packet_length)
	{
	byte packet_no;
	byte *buf;
	int length;
	int numPages;
	int try = 0;
	int time_out;
	byte status;


	PRINTK3("%s:smc_hardware_send_packet\n", 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", dev->name);
	return 0;
	}

	/* now, try to allocate the memory */

	SMC_SELECT_BANK(dev, 2);
	SMC_outw(dev, LAN91C96_MMUCR_ALLOC_TX \| numPages, LAN91C96_MMU);

	again:
	try++;
	time_out = MEMORY_WAIT_TIME;
	do {
	status = SMC_inb(dev, LAN91C96_INT_STATS);
	if (status & LAN91C96_IST_ALLOC_INT) {

	SMC_outb(dev, LAN91C96_IST_ALLOC_INT,
	LAN91C96_INT_STATS);
	break;
	}
	} while (--time_out);

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

	PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
	dev->name, try);

	/* I can send the packet now.. */
	buf = (byte *) packet;

	/* If I get here, I _know_ there is a packet slot waiting for me */
	packet_no = SMC_inb(dev, LAN91C96_ARR);
	if (packet_no & LAN91C96_ARR_FAILED) {
	/* or isn't there? BAD CHIP! */
	printf("%s: Memory allocation failed. \n", dev->name);
	return 0;
	}

	/* we have a packet address, so tell the card to use it */
	SMC_outb(dev, packet_no, LAN91C96_PNR);

	/* point to the beginning of the packet */
	SMC_outw(dev, LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);

	PRINTK3("%s: Trying to xmit packet of length %x\n",
	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(dev, (length + 6) << 16, LAN91C96_DATA_HIGH);
	#else
	SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
	/* send the packet length ( +6 for status words, length, and ctl */
	SMC_outw(dev, (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(dev, LAN91C96_DATA_HIGH, buf, length >> 2);
	if (length & 0x2)
	SMC_outw(dev, ((word ) (buf + (length & 0xFFFFFFFC))),
	LAN91C96_DATA_HIGH);
	#else
	SMC_outsw(dev, LAN91C96_DATA_HIGH, buf, (length) >> 1);
	#endif /* USE_32_BIT */

	/* Send the last byte, if there is one. */
	if ((length & 1) == 0) {
	SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
	} else {
	SMC_outw(dev, buf[length - 1] \| 0x2000, LAN91C96_DATA_HIGH);
	}

	/* and let the chipset deal with it */
	SMC_outw(dev, LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);

	/* poll for TX INT */
	if (poll4int (dev, LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
	/* sending failed */
	PRINTK2("%s: TX timeout, sending failed...\n", dev->name);

	/* release packet */
	SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);

	/* wait for MMU getting ready (low) */
	while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
	udelay (10);

	PRINTK2("MMU ready\n");


	return 0;
	} else {
	/* ack. int */
	SMC_outw(dev, LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);

	PRINTK2("%s: Sent packet of length %d \n", dev->name, length);

	/* release packet */
	SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);

	/* wait for MMU getting ready (low) */
	while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
	udelay (10);

	PRINTK2 ("MMU ready\n");
	}

	return length;
	}


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

	PRINTK2("%s:smc_open\n", dev->name);

	/* reset the hardware */

	smc_reset(dev);
	smc_enable(dev);

	SMC_SELECT_BANK(dev, 1);
	/* set smc_mac_addr, and sync it with u-boot globals */
	err = smc_get_ethaddr(bd, dev);
	if (err < 0)
	return -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(dev, address, LAN91C96_IA0 + i);
	}
	#else
	for (i = 0; i < 6; i++)
	SMC_outb(dev, smc_mac_addr[i], LAN91C96_IA0 + i);
	#endif
	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(struct eth_device *dev)
	{
	int packet_number;
	word status;
	word packet_length;
	int is_error = 0;

	#ifdef USE_32_BIT
	dword stat_len;
	#endif


	SMC_SELECT_BANK(dev, 2);
	packet_number = SMC_inw(dev, LAN91C96_FIFO);

	if (packet_number & LAN91C96_FIFO_RXEMPTY) {
	return 0;
	}

	PRINTK3("%s:smc_rcv\n", dev->name);
	/* start reading from the start of the packet */
	SMC_outw(dev, 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(dev, LAN91C96_DATA_HIGH);
	status = stat_len & 0xffff;
	packet_length = stat_len >> 16;
	#else
	status = SMC_inw(dev, LAN91C96_DATA_HIGH);
	packet_length = SMC_inw(dev, 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(dev, 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(dev, 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(dev, LAN91C96_DATA_HIGH, NetRxPackets[0],
	packet_length >> 1);

	#endif /* USE_32_BIT */

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

	while (SMC_inw(dev, 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(dev, LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);

	while (SMC_inw(dev, 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(struct eth_device *dev)
	{
	PRINTK2("%s:smc_close\n", dev->name);

	/* clear everything */
	smc_shutdown(dev);

	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 */

	static int lan91c96_init(struct eth_device dev, bd_t bd)
	{
	return smc_open(bd, dev);
	}

	static void lan91c96_halt(struct eth_device *dev)
	{
	smc_close(dev);
	}

	static int lan91c96_recv(struct eth_device *dev)
	{
	return smc_rcv(dev);
	}

	static int lan91c96_send(struct eth_device dev, void packet,
	int length)
	{
	return smc_send_packet(dev, packet, length);
	}

	/* smc_get_ethaddr
	*
	* This checks both the environment and the ROM for an ethernet address. If
	* found, the environment takes precedence.
	*/

	static int smc_get_ethaddr(bd_t bd, struct eth_device dev)
	{
	uchar v_mac[6];

	if (!eth_getenv_enetaddr("ethaddr", v_mac)) {
	/* get ROM mac value if any */
	if (!get_rom_mac(dev, v_mac)) {
	printf("\n*** ERROR: ethaddr is NOT set !!\n");
	return -1;
	}
	eth_setenv_enetaddr("ethaddr", v_mac);
	}

	smc_set_mac_addr(v_mac); /* use old function to update smc default */
	PRINTK("Using MAC Address %pM\n", v_mac);
	return 0;
	}

	/*
	* get_rom_mac()
	* Note, this has omly been tested for the OMAP730 P2.
	*/

	static int get_rom_mac(struct eth_device dev, unsigned char v_rom_mac)
	{
	#ifdef HARDCODE_MAC /* used for testing or to supress run time warnings */
	char hw_mac_addr[] = { 0x02, 0x80, 0xad, 0x20, 0x31, 0xb8 };

	memcpy (v_rom_mac, hw_mac_addr, 6);
	return (1);
	#else
	int i;
	SMC_SELECT_BANK(dev, 1);
	for (i=0; i<6; i++)
	{
	v_rom_mac[i] = SMC_inb(dev, LAN91C96_IA0 + i);
	}
	return (1);
	#endif
	}

	/* Structure to detect the device IDs */
	struct id_type {
	u8 id;
	char *name;
	};
	static struct id_type supported_chips[] = {
	{0, ""}, /* Dummy entry to prevent id check failure */
	{9, "LAN91C110"},
	{8, "LAN91C100FD"},
	{7, "LAN91C100"},
	{5, "LAN91C95"},
	{4, "LAN91C94/96"},
	{3, "LAN91C90/92"},
	};
	/* lan91c96_detect_chip
	* See:
	* http://www.embeddedsys.com/subpages/resources/images/documents/LAN91C96_datasheet.pdf
	* page 71 - that is the closest we get to detect this device
	*/
	static int lan91c96_detect_chip(struct eth_device *dev)
	{
	u8 chip_id;
	int r;
	SMC_SELECT_BANK(dev, 3);
	chip_id = (SMC_inw(dev, 0xA) & LAN91C96_REV_CHIPID) >> 4;
	SMC_SELECT_BANK(dev, 0);
	for (r = 0; r < sizeof(supported_chips) / sizeof(struct id_type); r++)
	if (chip_id == supported_chips[r].id)
	return r;
	return 0;
	}

	int lan91c96_initialize(u8 dev_num, int base_addr)
	{
	struct eth_device *dev;
	int r = 0;

	dev = malloc(sizeof(*dev));
	if (!dev) {
	return 0;
	}
	memset(dev, 0, sizeof(*dev));

	dev->iobase = base_addr;

	/* Try to detect chip. Will fail if not present. */
	r = lan91c96_detect_chip(dev);
	if (!r) {
	free(dev);
	return 0;
	}
	get_rom_mac(dev, dev->enetaddr);

	dev->init = lan91c96_init;
	dev->halt = lan91c96_halt;
	dev->send = lan91c96_send;
	dev->recv = lan91c96_recv;
	sprintf(dev->name, "%s-%hu", supported_chips[r].name, dev_num);

	eth_register(dev);
	return 0;
	}