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Wolfgang Denkc7db9a32005-08-19 00:53:02 +02001/*
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
31#define I2C_CHIP 0x50 /* I2C bus address of onboard EEPROM */
32#define I2C_ALEN 1 /* length of EEPROM addresses in bytes */
33#define I2C_OFFSET 0x0 /* start address of manufacturere data block
34 * in EEPROM */
35
36/* 64 Byte manufacturer data block in EEPROM */
37struct manufacturer_data {
38 unsigned int serial_number; /* serial number (0...999999) */
39 unsigned short hardware; /* hardware version (e.g. V1.02) */
40 unsigned short manuf_date; /* manufacture date (e.g. 25/02) */
41 unsigned char name[20]; /* device name (in CHIP.INI) */
42 unsigned char macadr[6]; /* MAC address */
43 signed char a_kal[4]; /* calibration value for U */
44 signed char i_kal[4]; /* calibration value for I */
45 unsigned char reserve[18]; /* reserved */
46 unsigned short save_nr; /* save count */
47 unsigned short chksum; /* checksum */
48};
49
50
51int i2c_read (unsigned char chip, unsigned int addr, int alen,
52 unsigned char *buffer, int len);
53
54/*-----------------------------------------------------------------------
55 * Process manufacturer data block in EEPROM:
56 *
57 * If we boot on a system fresh from factory, check if the manufacturer data
58 * in the EEPROM is valid and save some information it contains.
59 *
60 * CMC manufacturer data is defined as follows:
61 *
62 * - located in the onboard EEPROM
63 * - starts at offset 0x0
64 * - size 0x00000040
65 *
66 * Internal structure: see struct definition
67 */
68
69void load_sernum_ethaddr (void)
70{
71 struct manufacturer_data data;
Wolfgang Denkd52fb7e2006-03-11 22:53:33 +010072 char ethaddr[18];
73 char serial [9];
Wolfgang Denkc7db9a32005-08-19 00:53:02 +020074 unsigned short chksum;
75 unsigned char *p;
76 unsigned short i, is, id;
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;
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;
98 }
99
100 /* copy MAC address */
101 is = 0;
102 id = 0;
103 for (i = 0; i < 6; i++) {
104 sprintf (&ethaddr[id], "%02x", data.macadr[is++]);
105 id += 2;
106 if (is < 6)
107 ethaddr[id++] = ':';
108 }
109 ethaddr[id] = '\0'; /* just to be sure */
110
111 /* copy serial number */
112 sprintf (serial, "%d", data.serial_number);
113
114 /* set serial# and ethaddr if not yet defined */
115 if (getenv("serial#") == NULL) {
116 setenv ("serial#", serial);
117 }
118
119 if (getenv("ethaddr") == NULL) {
120 setenv ("ethaddr", ethaddr);
121 }
122}