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/*
* (C) Copyright 2000, 2001, 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2005
* Martin Krause, TQ-Systems GmbH, martin.krause@tqs.de
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
/* #define DEBUG */
#include <common.h>
#define I2C_CHIP 0x50 /* I2C bus address of onboard EEPROM */
#define I2C_ALEN 1 /* length of EEPROM addresses in bytes */
#define I2C_OFFSET 0x0 /* start address of manufacturere data block
* in EEPROM */
/* 64 Byte manufacturer data block in EEPROM */
struct manufacturer_data {
unsigned int serial_number; /* serial number (0...999999) */
unsigned short hardware; /* hardware version (e.g. V1.02) */
unsigned short manuf_date; /* manufacture date (e.g. 25/02) */
unsigned char name[20]; /* device name (in CHIP.INI) */
unsigned char macadr[6]; /* MAC address */
signed char a_kal[4]; /* calibration value for U */
signed char i_kal[4]; /* calibration value for I */
unsigned char reserve[18]; /* reserved */
unsigned short save_nr; /* save count */
unsigned short chksum; /* checksum */
};
int i2c_read (unsigned char chip, unsigned int addr, int alen,
unsigned char *buffer, int len);
/*-----------------------------------------------------------------------
* Process manufacturer data block in EEPROM:
*
* If we boot on a system fresh from factory, check if the manufacturer data
* in the EEPROM is valid and save some information it contains.
*
* CMC manufacturer data is defined as follows:
*
* - located in the onboard EEPROM
* - starts at offset 0x0
* - size 0x00000040
*
* Internal structure: see struct definition
*/
void load_sernum_ethaddr (void)
{
struct manufacturer_data data;
unsigned char serial [9];
unsigned char ethaddr[18];
unsigned short chksum;
unsigned char *p;
unsigned short i, is, id;
#if !defined(CONFIG_HARD_I2C) && !defined(CONFIG_SOFT_I2C)
#error you must define some I2C support (CONFIG_HARD_I2C or CONFIG_SOFT_I2C)
#endif
if (i2c_read(I2C_CHIP, I2C_OFFSET, I2C_ALEN, (unsigned char *)&data,
sizeof(data)) != 0) {
puts ("Error reading manufacturer data from EEPROM\n");
return;
}
/* check if manufacturer data block is valid */
p = (unsigned char *)&data;
chksum = 0;
for (i = 0; i < (sizeof(data) - sizeof(data.chksum)); i++)
chksum += *p++;
debug ("checksum of manufacturer data block: %#.4x\n", chksum);
if (chksum != data.chksum) {
puts ("Error: manufacturer data block has invalid checksum\n");
return;
}
/* copy MAC address */
is = 0;
id = 0;
for (i = 0; i < 6; i++) {
sprintf (ðaddr[id], "%02x", data.macadr[is++]);
id += 2;
if (is < 6)
ethaddr[id++] = ':';
}
ethaddr[id] = '\0'; /* just to be sure */
/* copy serial number */
sprintf (serial, "%d", data.serial_number);
/* set serial# and ethaddr if not yet defined */
if (getenv("serial#") == NULL) {
setenv ("serial#", serial);
}
if (getenv("ethaddr") == NULL) {
setenv ("ethaddr", ethaddr);
}
}
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