board/freescale/common/sys_eeprom.c

/*
 * Copyright 2006, 2008 Freescale Semiconductor
 * York Sun (yorksun@freescale.com)
 * Haiying Wang (haiying.wang@freescale.com)
 * Timur Tabi (timur@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>

#include "../common/eeprom.h"

#if !defined(CFG_I2C_EEPROM_CCID) && !defined(CFG_I2C_EEPROM_NXID)
#error "Please define either CFG_I2C_EEPROM_CCID or CFG_I2C_EEPROM_NXID"
#endif

/**
 * static eeprom: EEPROM layout for CCID or NXID formats
 *
 * See application note AN3638 for details.
 */
static struct __attribute__ ((__packed__)) eeprom {
#ifdef CFG_I2C_EEPROM_CCID
	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'CCID' */
	u8 major;         /* 0x04        Board revision, major */
	u8 minor;         /* 0x05        Board revision, minor */
	u8 sn[10];        /* 0x06 - 0x0F Serial Number*/
	u8 errata[2];     /* 0x10 - 0x11 Errata Level */
	u8 date[6];       /* 0x12 - 0x17 Build Date */
	u8 res_0[40];     /* 0x18 - 0x3f Reserved */
	u8 mac_count;     /* 0x40        Number of MAC addresses */
	u8 mac_flag;      /* 0x41        MAC table flags */
	u8 mac[8][6];     /* 0x42 - 0x71 MAC addresses */
	u32 crc;          /* 0x72        CRC32 checksum */
#endif
#ifdef CFG_I2C_EEPROM_NXID
	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'NXID' */
	u8 sn[12];        /* 0x04 - 0x0F Serial Number */
	u8 errata[5];     /* 0x10 - 0x14 Errata Level */
	u8 date[6];       /* 0x15 - 0x1a Build Date */
	u8 res_0;         /* 0x1b        Reserved */
	u32 version;      /* 0x1c - 0x1f NXID Version */
	u8 tempcal[8];    /* 0x20 - 0x27 Temperature Calibration Factors */
	u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
	u8 tempcalflags;  /* 0x2a        Temperature Calibration Flags */
	u8 res_1[21];     /* 0x2b - 0x3f Reserved */
	u8 mac_count;     /* 0x40        Number of MAC addresses */
	u8 mac_flag;      /* 0x41        MAC table flags */
	u8 mac[8][6];     /* 0x42 - 0x71 MAC addresses */
	u32 crc;          /* 0x72        CRC32 checksum */
#endif
} e;

/* Set to 1 if we've read EEPROM into memory */
static int has_been_read = 0;

#ifdef CFG_I2C_EEPROM_NXID
/* Is this a valid NXID EEPROM? */
#define is_valid (*((u32 *)e.id) == (('N' << 24) | ('X' << 16) | ('I' << 8) | 'D'))
#endif

#ifdef CFG_I2C_EEPROM_CCID
/* Is this a valid CCID EEPROM? */
#define is_valid (*((u32 *)e.id) == (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
#endif

/**
 * show_eeprom - display the contents of the EEPROM
 */
static void show_eeprom(void)
{
	int i;
	unsigned int crc;

	/* EEPROM tag ID, either CCID or NXID */
#ifdef CFG_I2C_EEPROM_NXID
	printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
		be32_to_cpu(e.version));
#else
	printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
#endif

	/* Serial number */
	printf("SN: %s\n", e.sn);

	/* Errata level. */
#ifdef CFG_I2C_EEPROM_NXID
	printf("Errata: %s\n", e.errata);
#else
	printf("Errata: %c%c\n",
		e.errata[0] ? e.errata[0] : '.',
		e.errata[1] ? e.errata[1] : '.');
#endif

	/* Build date, BCD date values, as YYMMDDhhmmss */
	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
		e.date[0], e.date[1], e.date[2],
		e.date[3] & 0x7F, e.date[4], e.date[5],
		e.date[3] & 0x80 ? "PM" : "");

	/* Show MAC addresses  */
	for (i = 0; i < min(e.mac_count, 8); i++) {
		u8 *p = e.mac[i];

		printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
			p[0], p[1], p[2], p[3],	p[4], p[5]);
	}

	crc = crc32(0, (void *)&e, sizeof(e) - 4);

	if (crc == be32_to_cpu(e.crc))
		printf("CRC: %08x\n", be32_to_cpu(e.crc));
	else
		printf("CRC: %08x (should be %08x)\n",
			be32_to_cpu(e.crc), crc);

#ifdef DEBUG
	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
	for (i = 0; i < sizeof(e); i++) {
		if ((i % 16) == 0)
			printf("%02X: ", i);
		printf("%02X ", ((u8 *)&e)[i]);
		if (((i % 16) == 15) || (i == sizeof(e) - 1))
			printf("\n");
	}
#endif
}

/**
 * read_eeprom - read the EEPROM into memory
 */
static int read_eeprom(void)
{
	int ret;
#ifdef CFG_EEPROM_BUS_NUM
	unsigned int bus;
#endif

	if (has_been_read)
		return 0;

#ifdef CFG_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CFG_EEPROM_BUS_NUM);
#endif

	ret = i2c_read(CFG_I2C_EEPROM_ADDR, 0, CFG_I2C_EEPROM_ADDR_LEN,
		(void *)&e, sizeof(e));

#ifdef CFG_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
#endif

#ifdef DEBUG
	show_eeprom();
#endif

	has_been_read = (ret == 0) ? 1 : 0;

	return ret;
}

/**
 * prog_eeprom - write the EEPROM from memory
 */
static int prog_eeprom(void)
{
	int ret, i, length;
	unsigned int crc;
	void *p;
#ifdef CFG_EEPROM_BUS_NUM
	unsigned int bus;
#endif

	/* Set the reserved values to 0xFF   */
#ifdef CFG_I2C_EEPROM_NXID
	e.res_0 = 0xFF;
	memset(e.res_1, 0xFF, sizeof(e.res_1));
#else
	memset(e.res_0, 0xFF, sizeof(e.res_0));
#endif

	length = sizeof(e);
	crc = crc32(0, (void *)&e, length - 4);
	e.crc = cpu_to_be32(crc);

#ifdef CFG_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CFG_EEPROM_BUS_NUM);
#endif

	for (i = 0, p = &e; i < length; i += 8, p += 8) {
		ret = i2c_write(CFG_I2C_EEPROM_ADDR, i, CFG_I2C_EEPROM_ADDR_LEN,
			p, min((length - i), 8));
		if (ret)
			break;
		udelay(5000);	/* 5ms write cycle timing */
	}

#ifdef CFG_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
#endif

	if (ret) {
		printf("Programming failed.\n");
		return -1;
	}

	printf("Programming passed.\n");
	return 0;
}

/**
 * h2i - converts hex character into a number
 *
 * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
 * the integer equivalent.
 */
static inline u8 h2i(char p)
{
	if ((p >= '0') && (p <= '9'))
		return p - '0';

	if ((p >= 'A') && (p <= 'F'))
		return (p - 'A') + 10;

	if ((p >= 'a') && (p <= 'f'))
		return (p - 'a') + 10;

	return 0;
}

/**
 * set_date - stores the build date into the EEPROM
 *
 * This function takes a pointer to a string in the format "YYMMDDhhmmss"
 * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
 * and stores it in the build date field of the EEPROM local copy.
 */
static void set_date(const char *string)
{
	unsigned int i;

	if (strlen(string) != 12) {
		printf("Usage: mac date YYMMDDhhmmss\n");
		return;
	}

	for (i = 0; i < 6; i++)
		e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);
}

/**
 * set_mac_address - stores a MAC address into the EEPROM
 *
 * This function takes a pointer to MAC address string
 * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
 * stores it in one of the MAC address fields of the EEPROM local copy.
 */
static void set_mac_address(unsigned int index, const char *string)
{
	char *p = (char *) string;
	unsigned int i;

	if (!string) {
		printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
		return;
	}

	for (i = 0; *p && (i < 6); i++) {
		e.mac[index][i] = simple_strtoul(p, &p, 16);
		if (*p == ':')
			p++;
	}
}

int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	int i;
	char cmd;

	if (argc == 1) {
		show_eeprom();
		return 0;
	}

	cmd = argv[1][0];

	if (cmd == 'r') {
		read_eeprom();
		return 0;
	}

	if ((cmd == 'i') && (argc > 2)) {
		for (i = 0; i < 4; i++)
			e.id[i] = argv[2][i];
		return 0;
	}

	if (!is_valid) {
		printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
		return 0;
	}

	if (argc == 2) {
		switch (cmd) {
		case 's':	/* save */
			prog_eeprom();
			break;
		default:
			printf("Usage:\n%s\n", cmdtp->usage);
			break;
		}

		return 0;
	}

	/* We know we have at least one parameter  */

	switch (cmd) {
	case 'n':	/* serial number */
		memset(e.sn, 0, sizeof(e.sn));
		strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
		break;
	case 'e':	/* errata */
#ifdef CFG_I2C_EEPROM_NXID
		memset(e.errata, 0, 5);
		strncpy((char *)e.errata, argv[2], 4);
#else
		e.errata[0] = argv[2][0];
		e.errata[1] = argv[2][1];
#endif
		break;
	case 'd':	/* date BCD format YYMMDDhhmmss */
		set_date(argv[2]);
		break;
	case 'p':	/* MAC table size */
		e.mac_count = simple_strtoul(argv[2], NULL, 16);
		break;
	case '0' ... '7':	/* "mac 0" through "mac 7" */
		set_mac_address(cmd - '0', argv[2]);
		break;
	case 'h':	/* help */
	default:
		printf("Usage:\n%s\n", cmdtp->usage);
		break;
	}

	return 0;
}

/**
 * mac_read_from_eeprom - read the MAC addresses from EEPROM
 *
 * This function reads the MAC addresses from EEPROM and sets the
 * appropriate environment variables for each one read.
 *
 * The environment variables are only set if they haven't been set already.
 * This ensures that any user-saved variables are never overwritten.
 *
 * This function must be called after relocation.
 */
int mac_read_from_eeprom(void)
{
	unsigned int i;

	if (read_eeprom()) {
		printf("Read failed.\n");
		return -1;
	}

	if (!is_valid) {
		printf("Invalid ID (%02x %02x %02x %02x)\n", e.id[0], e.id[1], e.id[2], e.id[3]);
		return -1;
	}

	if (be32_to_cpu(e.crc) != 0xFFFFFFFF) {
		u32 crc = crc32(0, (void *)&e, sizeof(e) - 4);

		if (crc != be32_to_cpu(e.crc)) {
			printf("CRC mismatch (%08x != %08x).\n", crc,
				be32_to_cpu(e.crc));
			return -1;
		}
	}

	for (i = 0; i < min(4, e.mac_count); i++) {
		if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
		    memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
			char ethaddr[18];
			char enetvar[9];

			sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
				e.mac[i][0],
				e.mac[i][1],
				e.mac[i][2],
				e.mac[i][3],
				e.mac[i][4],
				e.mac[i][5]);
			sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
			/* Only initialize environment variables that are blank
			 * (i.e. have not yet been set)
			 */
			if (!getenv(enetvar))
				setenv(enetvar, ethaddr);
		}
	}

	return 0;
}

#ifdef CFG_I2C_EEPROM_CCID

/**
 * get_cpu_board_revision - get the CPU board revision on 85xx boards
 *
 * Read the EEPROM to determine the board revision.
 *
 * This function is called before relocation, so we need to read a private
 * copy of the EEPROM into a local variable on the stack.
 *
 * Also, we assume that CFG_EEPROM_BUS_NUM == CFG_SPD_BUS_NUM.  The global
 * variable i2c_bus_num must be compile-time initialized to CFG_SPD_BUS_NUM,
 * so that the SPD code will work.  This means that all pre-relocation I2C
 * operations can only occur on the CFG_SPD_BUS_NUM bus.  So if
 * CFG_EEPROM_BUS_NUM != CFG_SPD_BUS_NUM, then we can't read the EEPROM when
 * this function is called.  Oh well.
 */
unsigned int get_cpu_board_revision(void)
{
	struct board_eeprom {
		u32 id;           /* 0x00 - 0x03 EEPROM Tag 'CCID' */
		u8 major;         /* 0x04        Board revision, major */
		u8 minor;         /* 0x05        Board revision, minor */
	} be;

	i2c_read(CFG_I2C_EEPROM_ADDR, 0, CFG_I2C_EEPROM_ADDR_LEN,
		(void *)&be, sizeof(be));

	if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
		return MPC85XX_CPU_BOARD_REV(0, 0);

	if ((be.major == 0xff) && (be.minor == 0xff))
		return MPC85XX_CPU_BOARD_REV(0, 0);

	return MPC85XX_CPU_BOARD_REV(e.major, e.minor);
}

#endif