Initialize serial# and ethaddr from manufacturer data in EEPROM on CMC-PU2

Patch by Martin Krause, 08 Jun 2005

1 files changed, 122 insertions, 0 deletions

diff --git a/board/cmc_pu2/load_sernum_ethaddr.c b/board/cmc_pu2/load_sernum_ethaddr.c
new file mode 100644
index 0000000..94aa30d
--- /dev/null
+++ b/board/cmc_pu2/load_sernum_ethaddr.c
@@ -0,0 +1,122 @@
+/*
+ * (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 (&ethaddr[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);
+	}
+}