board/cmc_pu2/load_sernum_ethaddr.c

   1 /*
   2  * (C) Copyright 2000, 2001, 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2005
   6  * Martin Krause, TQ-Systems GmbH, martin.krause@tqs.de
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /* #define DEBUG */
  28
  29 #include <common.h>
  30 #include <net.h>
  31
  32 #define I2C_CHIP        0x50    /* I2C bus address of onboard EEPROM */
  33 #define I2C_ALEN        1       /* length of EEPROM addresses in bytes */
  34 #define I2C_OFFSET      0x0     /* start address of manufacturere data block
  35                                  * in EEPROM */
  36
  37 /* 64 Byte manufacturer data block in EEPROM */
  38 struct manufacturer_data {
  39         unsigned int    serial_number;  /* serial number (0...999999) */
  40         unsigned short  hardware;       /* hardware version (e.g. V1.02) */
  41         unsigned short  manuf_date;     /* manufacture date (e.g. 25/02) */
  42         unsigned char   name[20];       /* device name (in CHIP.INI) */
  43         unsigned char   macadr[6];      /* MAC address */
  44         signed char     a_kal[4];       /* calibration value for U */
  45         signed char     i_kal[4];       /* calibration value for I */
  46         unsigned char   reserve[18];    /* reserved */
  47         unsigned short  save_nr;        /* save count */
  48         unsigned short  chksum;         /* checksum */
  49 };
  50
  51
  52 int i2c_read (unsigned char chip, unsigned int addr, int alen,
  53               unsigned char *buffer, int len);
  54
  55 /*-----------------------------------------------------------------------
  56  * Process manufacturer data block in EEPROM:
  57  *
  58  * If we boot on a system fresh from factory, check if the manufacturer data
  59  * in the EEPROM is valid and save some information it contains.
  60  *
  61  * CMC manufacturer data is defined as follows:
  62  *
  63  * - located in the onboard EEPROM
  64  * - starts at offset 0x0
  65  * - size 0x00000040
  66  *
  67  * Internal structure: see struct definition
  68  */
  69
  70 int misc_init_r(void)
  71 {
  72         struct manufacturer_data data;
  73         char  serial [9];
  74         unsigned short chksum;
  75         unsigned char *p;
  76         unsigned short i;
  77
  78 #if !defined(CONFIG_HARD_I2C) && !defined(CONFIG_SOFT_I2C)
  79 #error you must define some I2C support (CONFIG_HARD_I2C or CONFIG_SOFT_I2C)
  80 #endif
  81         if (i2c_read(I2C_CHIP, I2C_OFFSET, I2C_ALEN, (unsigned char *)&data,
  82                      sizeof(data)) != 0) {
  83                 puts ("Error reading manufacturer data from EEPROM\n");
  84                 return -1;
  85         }
  86
  87         /* check if manufacturer data block is valid  */
  88         p = (unsigned char *)&data;
  89         chksum = 0;
  90         for (i = 0; i < (sizeof(data) - sizeof(data.chksum)); i++)
  91                 chksum += *p++;
  92
  93         debug ("checksum of manufacturer data block: %#.4x\n", chksum);
  94
  95         if (chksum != data.chksum) {
  96                 puts ("Error: manufacturer data block has invalid checksum\n");
  97                 return -1;
  98         }
  99
 100         /* copy serial number */
 101         sprintf (serial, "%d", data.serial_number);
 102
 103         /* set serial# and ethaddr if not yet defined */
 104         if (getenv("serial#") == NULL) {
 105                 setenv ("serial#", serial);
 106         }
 107
 108         if (getenv("ethaddr") == NULL) {
 109                 eth_setenv_enetaddr("ethaddr", data.macadr);
 110         }
 111
 112         return 0;
 113 }