u-boot/board/matrix_vision/mvblx/sys_eeprom.c

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/*
* Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
* York Sun (yorksun@freescale.com)
* Haiying Wang (haiying.wang@freescale.com)
* Timur Tabi (timur@freescale.com)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <i2c.h>
/* #define DEBUG */
/*
* static eeprom: EEPROM layout
*/
static struct __attribute__ ((__packed__)) eeprom {
u8 id[16]; /* 0x01 - 0x0F Type e.g. 100wG-5111 */
u8 sn[10]; /* 0x10 - 0x19 Serial Number */
u8 date[6]; /* 0x1A - 0x1F Build Date */
u8 mac[6]; /* 0x20 - 0x25 MAC address */
u8 reserved[10];/* 0x26 - 0x2f reserved */
u32 crc; /* x+1 CRC32 checksum */
} e;
/* Set to 1 if we've read EEPROM into memory */
static int has_been_read;
/**
* show_eeprom - display the contents of the EEPROM
*/
static void show_eeprom(void)
{
unsigned int crc;
char safe_string[16];
#ifdef DEBUG
int i;
#endif
u8 *p;
/* ID */
strncpy(safe_string, (char *)e.id, sizeof(e.id));
safe_string[sizeof(e.id)-1] = 0;
printf("ID: mvBlueLYNX-X%s\n", safe_string);
/* Serial number */
strncpy(safe_string, (char *)e.sn, sizeof(e.sn));
safe_string[sizeof(e.sn)-1] = 0;
printf("SN: %s\n", safe_string);
/* 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 address */
p = e.mac;
printf("Eth: %02x:%02x:%02x:%02x:%02x:%02x\n",
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 CONFIG_SYS_EEPROM_BUS_NUM
unsigned int bus;
#endif
if (has_been_read)
return 0;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
(uchar *)&e, sizeof(e));
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
#ifdef DEBUG
show_eeprom();
#endif
has_been_read = (ret == 0) ? 1 : 0;
return ret;
}
/**
* update_crc - update the CRC
*
* This function should be called after each update to the EEPROM structure,
* to make sure the CRC is always correct.
*/
static void update_crc(void)
{
u32 crc;
crc = crc32(0, (void *)&e, sizeof(e) - 4);
e.crc = cpu_to_be32(crc);
}
/**
* prog_eeprom - write the EEPROM from memory
*/
static int prog_eeprom(void)
{
int ret = 0;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
unsigned int bus;
#endif
update_crc();
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
ret = eeprom_write(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
(uchar *)&e, sizeof(e));
if (!ret) {
/* Verify the write by reading back the EEPROM and comparing */
struct eeprom e2;
#ifdef DEBUG
printf("%s verifying...\n", __func__);
#endif
ret = eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
(uchar *)&e2, sizeof(e2));
if (!ret && memcmp(&e, &e2, sizeof(e)))
ret = -1;
}
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
if (ret) {
printf("Programming failed.\n");
has_been_read = 0;
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]);
update_crc();
}
/**
* 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 the MAC address field in the EEPROM local copy.
*/
static void set_mac_address(const char *string)
{
char *p = (char *) string;
unsigned int i;
for (i = 0; *p && (i < 6); i++) {
e.mac[i] = simple_strtoul(p, &p, 16);
if (*p == ':')
p++;
}
update_crc();
}
int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char cmd;
if (argc == 1) {
show_eeprom();
return 0;
}
cmd = argv[1][0];
if (cmd == 'r') {
#ifdef DEBUG
printf("%s read\n", __func__);
#endif
read_eeprom();
return 0;
}
if (argc == 2) {
switch (cmd) {
case 's': /* save */
#ifdef DEBUG
printf("%s save\n", __func__);
#endif
prog_eeprom();
break;
default:
return cmd_usage(cmdtp);
}
return 0;
}
/* We know we have at least one parameter */
switch (cmd) {
case 'n': /* serial number */
#ifdef DEBUG
printf("%s serial number\n", __func__);
#endif
memset(e.sn, 0, sizeof(e.sn));
strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
update_crc();
break;
case 'd': /* date BCD format YYMMDDhhmmss */
set_date(argv[2]);
break;
case 'e': /* errata */
printf("mac errata not implemented\n");
break;
case 'i': /* id */
memset(e.id, 0, sizeof(e.id));
strncpy((char *)e.id, argv[2], sizeof(e.id) - 1);
update_crc();
break;
case 'p': /* ports */
printf("mac ports not implemented (always 1 port)\n");
break;
case '0' ... '9':
/* we only have "mac 0" but any digit can be used here */
set_mac_address(argv[2]);
break;
case 'h': /* help */
default:
return cmd_usage(cmdtp);
}
return 0;
}
static inline int is_portrait(void)
{
int i;
unsigned int orient_index = 0; /* idx of char which determines orientation */
for (i = sizeof(e.id)/sizeof(*e.id) - 1; i>=0; i--) {
if (e.id[i] == '-') {
orient_index = i+1;
break;
}
}
return (orient_index &&
(e.id[orient_index] >= '5') && (e.id[orient_index] <= '8'));
}
int mac_read_from_eeprom(void)
{
u32 crc, crc_offset = offsetof(struct eeprom, crc);
u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
#define FILENAME_LANDSCAPE "mvBlueLynx_X.rbf"
#define FILENAME_PORTRAIT "mvBlueLynx_X_sensor_cd.rbf"
if (read_eeprom()) {
printf("EEPROM Read failed.\n");
return -1;
}
crc = crc32(0, (void *)&e, crc_offset);
crcp = (void *)&e + crc_offset;
if (crc != be32_to_cpu(*crcp)) {
printf("EEPROM CRC mismatch (%08x != %08x)\n", crc,
be32_to_cpu(e.crc));
return -1;
}
if (memcmp(&e.mac, "\0\0\0\0\0\0", 6) &&
memcmp(&e.mac, "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
char ethaddr[18];
sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
e.mac[0],
e.mac[1],
e.mac[2],
e.mac[3],
e.mac[4],
e.mac[5]);
/* Only initialize environment variables that are blank
* (i.e. have not yet been set)
*/
if (!getenv("ethaddr"))
setenv("ethaddr", ethaddr);
}
if (memcmp(&e.sn, "\0\0\0\0\0\0\0\0\0\0", 10) &&
memcmp(&e.sn, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 10)) {
char serial_num[12];
strncpy(serial_num, (char *)e.sn, sizeof(e.sn) - 1);
/* Only initialize environment variables that are blank
* (i.e. have not yet been set)
*/
if (!getenv("serial#"))
setenv("serial#", serial_num);
}
/* decide which fpga file to load depending on orientation */
if (is_portrait())
setenv("fpgafilename", FILENAME_PORTRAIT);
else
setenv("fpgafilename", FILENAME_LANDSCAPE);
/* TODO should I calculate CRC here? */
return 0;
}
#ifdef CONFIG_SERIAL_TAG
void get_board_serial(struct tag_serialnr *serialnr)
{
char *serial = getenv("serial#");
if (serial && (strlen(serial) > 3)) {
/* use the numerical part of the serial number LXnnnnnn */
serialnr->high = 0;
serialnr->low = simple_strtoul(serial + 2, NULL, 10);
} else {
serialnr->high = 0;
serialnr->low = 0;
}
}
#endif