text: /*------------------------------------------------------------------------
   * 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)
   *
   * SPDX-License-Identifier:	GPL-2.0+
   *
   * 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, net_rx_packets[0],
  			 packet_length >> 2);
  		/* read the left over bytes */
  		if (packet_length & 3) {
  			int i;
  
  			byte *tail = (byte *)(net_rx_packets[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, net_rx_packets[0],
  			 packet_length >> 1);
  
  #endif /* USE_32_BIT */
  
  #if	SMC_DEBUG > 2
  		printf ("Receiving Packet\n");
  		print_packet((byte *)net_rx_packets[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. */
  		net_process_received_packet(net_rx_packets[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)
  {
  	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);
  }
  
  /* 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 < ARRAY_SIZE(supported_chips); 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;
  }
  