sys_eeprom.c

/*
 * Copyright 2006 Freescale Semiconductor
 * York Sun (yorksun@freescale.com)
 * Haiying Wang (haiying.wang@freescale.com)
 *
 * 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
 */

#include <common.h>
#include <command.h>
#include <i2c.h>
#include <linux/ctype.h>

#ifdef CFG_ID_EEPROM
typedef struct {
	unsigned char id[4];    /* 0x0000 - 0x0003 */
	unsigned char sn[12];   /* 0x0004 - 0x000F */
	unsigned char errata[5];/* 0x0010 - 0x0014 */
	unsigned char date[7];  /* 0x0015 - 0x001a */
	unsigned char res_1[37];/* 0x001b - 0x003f */
	unsigned char tab_size; /* 0x0040 */
	unsigned char tab_flag; /* 0x0041 */
	unsigned char mac[8][6];/* 0x0042 - 0x0071 */
	unsigned char res_2[126];/* 0x0072 - 0x00ef */
	unsigned int  crc;      /* 0x00f0 - 0x00f3 crc32 checksum */
} EEPROM_data;

static EEPROM_data mac_data;

int mac_show(void)
{
	int i;
	unsigned char ethaddr[8][18];

	printf("ID %c%c%c%c\n", mac_data.id[0],\
				mac_data.id[1],\
				mac_data.id[2],\
				mac_data.id[3]);
	printf("Errata %c%c%c%c%c\n",   mac_data.errata[0],\
				mac_data.errata[1],\
				mac_data.errata[2],\
				mac_data.errata[3],\
				mac_data.errata[4]);
	printf("Date %c%c%c%c%c%c%c\n", mac_data.date[0],\
				mac_data.date[1],\
				mac_data.date[2],\
				mac_data.date[3],\
				mac_data.date[4],\
				mac_data.date[5],\
				mac_data.date[6]);
	for (i = 0; i < 8; i++) {
		sprintf(ethaddr[i],"%02x:%02x:%02x:%02x:%02x:%02x",\
					mac_data.mac[i][0],\
					mac_data.mac[i][1],\
					mac_data.mac[i][2],\
					mac_data.mac[i][3],\
					mac_data.mac[i][4],\
					mac_data.mac[i][5]);
		printf("MAC %d %s\n", i, ethaddr[i]);
	}

	setenv("ethaddr", ethaddr[0]);
	setenv("eth1addr", ethaddr[1]);
	setenv("eth2addr", ethaddr[2]);
	setenv("eth3addr", ethaddr[3]);

	return 0;
}

int mac_read(void)
{
	int ret,length;
	unsigned int crc = 0;
	unsigned char dev = ID_EEPROM_ADDR, *data;

	length = sizeof(EEPROM_data);
	ret = i2c_read(dev, 0, 1, (unsigned char *)(&mac_data), length);
	if (ret) {
		printf("Read failed.\n");
		return -1;
	}

	data = (unsigned char *)(&mac_data);
	printf("Check CRC on reading ...");
	crc = crc32(crc, data, length-4);
	if (crc != mac_data.crc) {
		printf("CRC checksum is invalid, in EEPROM CRC is %x, calculated CRC is %x\n",mac_data.crc,crc);
		return -1;
	}
	else {
		printf("CRC OK\n");
		mac_show();
	}
	return 0;
}

int mac_prog(void)
{
	int ret, i, length;
	unsigned int crc = 0;
	unsigned char dev = ID_EEPROM_ADDR,*ptr;
	unsigned char * eeprom_data = (unsigned char *)(&mac_data);

	for (i = 0; i < sizeof(mac_data.res_1); i++)
		mac_data.res_1[i] = 0;
	for (i = 0;i < sizeof(mac_data.res_2); i++)
		mac_data.res_2[i] = 0;
	length = sizeof(EEPROM_data);
	crc = crc32 (crc, eeprom_data, length-4);
	mac_data.crc = crc;
	for (i = 0, ptr = eeprom_data; i < length; i += 8, ptr += 8) {
		ret = i2c_write(dev, i, 1, ptr, (length-i) <8 ? (length-i) : 8);
		udelay(5000);           /* 5ms write cycle timing */
		if (ret)
			break;
	}
	if (ret) {
		printf("Programming failed.\n");
		return -1;
	}
	else {
		printf("Programming %d bytes. Reading back ...\n",length);
		mac_read();
	}
	return 0;
}

int do_mac (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	int i;
	char cmd = 's';
	unsigned long long mac_val;

	if(i2c_probe(ID_EEPROM_ADDR) != 0)
		return -1;

	if(argc>1) {
		cmd = argv[1][0];
		switch (cmd) {
			case 'r':       /* display */
				mac_read();
				break;
			case 's':       /* save */
				mac_prog();
				break;
			case 'i':       /* id */
				for (i=0; i<4; i++) {
					mac_data.id[i] = argv[2][i];
				}
				break;
			case 'n':       /* serial number */
				for (i=0; i<12; i++) {
					mac_data.sn[i] = argv[2][i];
				}
				break;
			case 'e':       /* errata */
				for (i=0; i<5; i++) {
					mac_data.errata[i] = argv[2][i];
				}
				break;
			case 'd':       /* date */
				for (i=0; i<7; i++) {
					mac_data.date[i] = argv[2][i];
				}
				break;
			case 'p':       /* number of ports */
				mac_data.tab_size = (unsigned char)simple_strtoul(argv[2],NULL,16);
				break;
			case '0':       /* mac 0 */
			case '1':       /* mac 1 */
			case '2':       /* mac 2 */
			case '3':       /* mac 3 */
			case '4':       /* mac 4 */
			case '5':       /* mac 5 */
			case '6':       /* mac 6 */
			case '7':       /* mac 7 */
				mac_val = simple_strtoull(argv[2],NULL,16);
				for (i=0; i<6; i++) {
					mac_data.mac[cmd-'0'][i] = *((unsigned char *)(((unsigned int)(&mac_val))+i+2));
				}
				break;
			case 'h':       /* help */
			default:
				printf ("Usage:\n%s\n", cmdtp->usage);
				break;
		}
	}
	else {
		mac_show();
	}
	return 0;
}

int mac_read_from_eeprom(void)
{
	int length,i;
	unsigned char dev = ID_EEPROM_ADDR, *data, ethaddr[4][18], enetvar[32];
	unsigned int crc = 0;

	length = sizeof(EEPROM_data);
	if(i2c_read (dev, 0, 1, (unsigned char *)(&mac_data), length)) {
		printf("Read failed.\n");
		return -1;
	}

	data = (unsigned char *)(&mac_data);
	crc = crc32(crc, data, length-4);
	if (crc != mac_data.crc) {
		return -1;
	}
	else {
		for(i=0; i<4; i++) {
			if(memcmp(&mac_data.mac[i], "\0\0\0\0\0\0", 6)) {
				sprintf(ethaddr[i], "%02x:%02x:%02x:%02x:%02x:%02x", \
					mac_data.mac[i][0], \
					mac_data.mac[i][1], \
					mac_data.mac[i][2], \
					mac_data.mac[i][3], \
					mac_data.mac[i][4], \
					mac_data.mac[i][5]);
				sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
				setenv(enetvar, ethaddr[i]);
			}
		}
	}
	return 0;
}
#endif  /* CFG_ID_EEPROM */