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    /*
     * Copyright 1998-2001 by Donald Becker.
     * This software may be used and distributed according to the terms of
     * the GNU General Public License (GPL), incorporated herein by reference.
     * Contact the author for use under other terms.
     *
     * This program must be compiled with "-O"!
     * See the bottom of this file for the suggested compile-command.
     *
     * The author may be reached as becker@scyld.com, or C/O
     *  Scyld Computing Corporation
     *  410 Severn Ave., Suite 210
     *  Annapolis MD 21403
     *
     * Common-sense licensing statement: Using any portion of this program in
     * your own program means that you must give credit to the original author
     * and release the resulting code under the GPL.
     */
    
    #define _PPC_STRING_H_		/* avoid unnecessary str/mem functions */
    #define _LINUX_STRING_H_	/* avoid unnecessary str/mem functions */
    
    #include <common.h>
    
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    static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr);
    
    
    int eepro100_eeprom(int argc, char *argv[])
    
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    {
    	int ret = 0;
    
    	unsigned char hwaddr1[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x05 };
    	unsigned char hwaddr2[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x06 };
    
    
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    #if defined(CONFIG_OXC)
    	ret |= reset_eeprom(0x80000000, hwaddr1);
    	ret |= reset_eeprom(0x81000000, hwaddr2);
    #endif
    
    	return ret;
    }
    
    /* Default EEPROM for i82559 */
    static unsigned short default_eeprom[64] = {
    	0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
    	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
    };
    
    static unsigned short eeprom[256];
    
    static int eeprom_size = 64;
    static int eeprom_addr_size = 6;
    
    static int debug = 0;
    
    static inline unsigned short swap16(unsigned short x)
    {
    	return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
    }
    
    static inline void outw(short data, long addr)
    {
    	*(volatile short *)(addr) = swap16(data);
    }
    
    static inline short inw(long addr)
    {
    	return swap16(*(volatile short *)(addr));
    }
    
    static inline void *memcpy(void *dst, const void *src, unsigned int len)
    {
    
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    	char *ret = dst;
    
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    	while (len-- > 0) {
    		*ret++ = *((char *)src);
    		src++;
    	}
    
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    	return (void *)ret;
    
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    }
    
    /* The EEPROM commands include the alway-set leading bit. */
    #define EE_WRITE_CMD	(5)
    #define EE_READ_CMD		(6)
    #define EE_ERASE_CMD	(7)
    
    /* Serial EEPROM section. */
    #define EE_SHIFT_CLK	0x01	/* EEPROM shift clock. */
    #define EE_CS			0x02	/* EEPROM chip select. */
    #define EE_DATA_WRITE	0x04	/* EEPROM chip data in. */
    #define EE_DATA_READ	0x08	/* EEPROM chip data out. */
    #define EE_ENB			(0x4800 | EE_CS)
    #define EE_WRITE_0		0x4802
    #define EE_WRITE_1		0x4806
    #define EE_OFFSET		14
    
    /* Delay between EEPROM clock transitions. */
    #define eeprom_delay(ee_addr)	inw(ee_addr)
    
    /* Wait for the EEPROM to finish the previous operation. */
    static int eeprom_busy_poll(long ee_ioaddr)
    {
    	int i;
    	outw(EE_ENB, ee_ioaddr);
    	for (i = 0; i < 10000; i++)			/* Typical 2000 ticks */
    		if (inw(ee_ioaddr) & EE_DATA_READ)
    			break;
    	return i;
    }
    
    /* This executes a generic EEPROM command, typically a write or write enable.
       It returns the data output from the EEPROM, and thus may also be used for
       reads. */
    static int do_eeprom_cmd(long ioaddr, int cmd, int cmd_len)
    {
    	unsigned retval = 0;
    	long ee_addr = ioaddr + EE_OFFSET;
    
    	if (debug > 1)
    
    		printf(" EEPROM op 0x%x: ", cmd);
    
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    	outw(EE_ENB | EE_SHIFT_CLK, ee_addr);
    
    	/* Shift the command bits out. */
    	do {
    		short dataval = (cmd & (1 << cmd_len)) ? EE_WRITE_1 : EE_WRITE_0;
    		outw(dataval, ee_addr);
    		eeprom_delay(ee_addr);
    		if (debug > 2)
    
    			printf("%X", inw(ee_addr) & 15);
    
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    		outw(dataval | EE_SHIFT_CLK, ee_addr);
    		eeprom_delay(ee_addr);
    		retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);
    	} while (--cmd_len >= 0);
    #if 0
    	outw(EE_ENB, ee_addr);
    #endif
    	/* Terminate the EEPROM access. */
    	outw(EE_ENB & ~EE_CS, ee_addr);
    	if (debug > 1)
    
    		printf(" EEPROM result is 0x%5.5x.\n", retval);
    
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    	return retval;
    }
    
    static int read_eeprom(long ioaddr, int location, int addr_len)
    {
    	return do_eeprom_cmd(ioaddr, ((EE_READ_CMD << addr_len) | location)
    		<< 16 , 3 + addr_len + 16) & 0xffff;
    }
    
    static void write_eeprom(long ioaddr, int index, int value, int addr_len)
    {
    	long ee_ioaddr = ioaddr + EE_OFFSET;
    	int i;
    
    	/* Poll for previous op finished. */
    	eeprom_busy_poll(ee_ioaddr);			/* Typical 0 ticks */
    	/* Enable programming modes. */
    	do_eeprom_cmd(ioaddr, (0x4f << (addr_len-4)), 3 + addr_len);
    	/* Do the actual write. */
    	do_eeprom_cmd(ioaddr,
    				  (((EE_WRITE_CMD<<addr_len) | index)<<16) | (value & 0xffff),
    				  3 + addr_len + 16);
    	/* Poll for write finished. */
    	i = eeprom_busy_poll(ee_ioaddr);			/* Typical 2000 ticks */
    	if (debug)
    
    		printf(" Write finished after %d ticks.\n", i);
    
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    	/* Disable programming. This command is not instantaneous, so we check
    	   for busy before the next op. */
    	do_eeprom_cmd(ioaddr, (0x40 << (addr_len-4)), 3 + addr_len);
    	eeprom_busy_poll(ee_ioaddr);
    }
    
    static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr)
    {
    	unsigned short checksum = 0;
    	int size_test;
    	int i;
    
    
    	printf("Resetting i82559 EEPROM @ 0x%08lX ... ", ioaddr);
    
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    	size_test = do_eeprom_cmd(ioaddr, (EE_READ_CMD << 8) << 16, 27);
    	eeprom_addr_size = (size_test & 0xffe0000) == 0xffe0000 ? 8 : 6;
    	eeprom_size = 1 << eeprom_addr_size;
    
    	memcpy(eeprom, default_eeprom, sizeof default_eeprom);
    
    	for (i = 0; i < 3; i++)
    		eeprom[i] = (hwaddr[i*2+1]<<8) + hwaddr[i*2];
    
    	/* Recalculate the checksum. */
    	for (i = 0; i < eeprom_size - 1; i++)
    		checksum += eeprom[i];
    	eeprom[i] = 0xBABA - checksum;
    
    	for (i = 0; i < eeprom_size; i++)
    		write_eeprom(ioaddr, i, eeprom[i], eeprom_addr_size);
    
    	for (i = 0; i < eeprom_size; i++)
    		if (read_eeprom(ioaddr, i, eeprom_addr_size) != eeprom[i]) {
    
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    			return 1;
    		}
    
    
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    	return 0;
    }