u-boot/board/compulab/common/eeprom.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Nikita Kiryanov <nikita@compulab.co.il>
* Igor Grinberg <grinberg@compulab.co.il>
*/
#include <common.h>
#include <i2c.h>
#include <eeprom_layout.h>
#include <eeprom_field.h>
#include <asm/setup.h>
#include <linux/kernel.h>
#include "eeprom.h"
#ifndef CONFIG_SYS_I2C_EEPROM_ADDR
# define CONFIG_SYS_I2C_EEPROM_ADDR 0x50
# define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
#endif
#ifndef CONFIG_SYS_I2C_EEPROM_BUS
#define CONFIG_SYS_I2C_EEPROM_BUS 0
#endif
#define EEPROM_LAYOUT_VER_OFFSET 44
#define BOARD_SERIAL_OFFSET 20
#define BOARD_SERIAL_OFFSET_LEGACY 8
#define BOARD_REV_OFFSET 0
#define BOARD_REV_OFFSET_LEGACY 6
#define BOARD_REV_SIZE 2
#define PRODUCT_NAME_OFFSET 128
#define PRODUCT_NAME_SIZE 16
#define MAC_ADDR_OFFSET 4
#define MAC_ADDR_OFFSET_LEGACY 0
#define LAYOUT_INVALID 0
#define LAYOUT_LEGACY 0xff
static int cl_eeprom_bus;
static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
static int cl_eeprom_read(uint offset, uchar *buf, int len)
{
int res;
unsigned int current_i2c_bus = i2c_get_bus_num();
res = i2c_set_bus_num(cl_eeprom_bus);
if (res < 0)
return res;
res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
i2c_set_bus_num(current_i2c_bus);
return res;
}
static int cl_eeprom_setup(uint eeprom_bus)
{
int res;
/*
* We know the setup was already done when the layout is set to a valid
* value and we're using the same bus as before.
*/
if (cl_eeprom_layout != LAYOUT_INVALID && eeprom_bus == cl_eeprom_bus)
return 0;
cl_eeprom_bus = eeprom_bus;
res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
(uchar *)&cl_eeprom_layout, 1);
if (res) {
cl_eeprom_layout = LAYOUT_INVALID;
return res;
}
if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
cl_eeprom_layout = LAYOUT_LEGACY;
return 0;
}
void get_board_serial(struct tag_serialnr *serialnr)
{
u32 serial[2];
uint offset;
memset(serialnr, 0, sizeof(*serialnr));
if (cl_eeprom_setup(CONFIG_SYS_I2C_EEPROM_BUS))
return;
offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
if (cl_eeprom_read(offset, (uchar *)serial, 8))
return;
if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
serialnr->low = serial[0];
serialnr->high = serial[1];
}
}
/*
* Routine: cl_eeprom_read_mac_addr
* Description: read mac address and store it in buf.
*/
int cl_eeprom_read_mac_addr(uchar *buf, uint eeprom_bus)
{
uint offset;
int err;
err = cl_eeprom_setup(eeprom_bus);
if (err)
return err;
offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
return cl_eeprom_read(offset, buf, 6);
}
static u32 board_rev;
/*
* Routine: cl_eeprom_get_board_rev
* Description: read system revision from eeprom
*/
u32 cl_eeprom_get_board_rev(uint eeprom_bus)
{
char str[5]; /* Legacy representation can contain at most 4 digits */
uint offset = BOARD_REV_OFFSET_LEGACY;
if (board_rev)
return board_rev;
if (cl_eeprom_setup(eeprom_bus))
return 0;
if (cl_eeprom_layout != LAYOUT_LEGACY)
offset = BOARD_REV_OFFSET;
if (cl_eeprom_read(offset, (uchar *)&board_rev, BOARD_REV_SIZE))
return 0;
/*
* Convert legacy syntactic representation to semantic
* representation. i.e. for rev 1.00: 0x100 --> 0x64
*/
if (cl_eeprom_layout == LAYOUT_LEGACY) {
sprintf(str, "%x", board_rev);
board_rev = simple_strtoul(str, NULL, 10);
}
return board_rev;
};
/*
* Routine: cl_eeprom_get_board_rev
* Description: read system revision from eeprom
*
* @buf: buffer to store the product name
* @eeprom_bus: i2c bus num of the eeprom
*
* @return: 0 on success, < 0 on failure
*/
int cl_eeprom_get_product_name(uchar *buf, uint eeprom_bus)
{
int err;
if (buf == NULL)
return -EINVAL;
err = cl_eeprom_setup(eeprom_bus);
if (err)
return err;
err = cl_eeprom_read(PRODUCT_NAME_OFFSET, buf, PRODUCT_NAME_SIZE);
if (!err) /* Protect ourselves from invalid data (unterminated str) */
buf[PRODUCT_NAME_SIZE - 1] = '\0';
return err;
}
#ifdef CONFIG_CMD_EEPROM_LAYOUT
/**
* eeprom_field_print_bin_ver() - print a "version field" which contains binary
* data
*
* Treat the field data as simple binary data, and print it formatted as a
* version number (2 digits after decimal point).
* The field size must be exactly 2 bytes.
*
* Sample output:
* Field Name 123.45
*
* @field: an initialized field to print
*/
void eeprom_field_print_bin_ver(const struct eeprom_field *field)
{
if ((field->buf[0] == 0xff) && (field->buf[1] == 0xff)) {
field->buf[0] = 0;
field->buf[1] = 0;
}
printf(PRINT_FIELD_SEGMENT, field->name);
int major = (field->buf[1] << 8 | field->buf[0]) / 100;
int minor = (field->buf[1] << 8 | field->buf[0]) - major * 100;
printf("%d.%02d\n", major, minor);
}
/**
* eeprom_field_update_bin_ver() - update a "version field" which contains
* binary data
*
* This function takes a version string in the form of x.y (x and y are both
* decimal values, y is limited to two digits), translates it to the binary
* form, then writes it to the field. The field size must be exactly 2 bytes.
*
* This function strictly enforces the data syntax, and will not update the
* field if there's any deviation from it. It also protects from overflow.
*
* @field: an initialized field
* @value: a version string
*
* Returns 0 on success, -1 on failure.
*/
int eeprom_field_update_bin_ver(struct eeprom_field *field, char *value)
{
char *endptr;
char *tok = strtok(value, ".");
if (tok == NULL)
return -1;
int num = simple_strtol(tok, &endptr, 0);
if (*endptr != '\0')
return -1;
tok = strtok(NULL, "");
if (tok == NULL)
return -1;
int remainder = simple_strtol(tok, &endptr, 0);
if (*endptr != '\0')
return -1;
num = num * 100 + remainder;
if (num >> 16)
return -1;
field->buf[0] = (unsigned char)num;
field->buf[1] = num >> 8;
return 0;
}
char *months[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
/**
* eeprom_field_print_date() - print a field which contains date data
*
* Treat the field data as simple binary data, and print it formatted as a date.
* Sample output:
* Field Name 07/Feb/2014
* Field Name 56/BAD/9999
*
* @field: an initialized field to print
*/
void eeprom_field_print_date(const struct eeprom_field *field)
{
printf(PRINT_FIELD_SEGMENT, field->name);
printf("%02d/", field->buf[0]);
if (field->buf[1] >= 1 && field->buf[1] <= 12)
printf("%s", months[field->buf[1] - 1]);
else
printf("BAD");
printf("/%d\n", field->buf[3] << 8 | field->buf[2]);
}
static int validate_date(unsigned char day, unsigned char month,
unsigned int year)
{
int days_in_february;
switch (month) {
case 0:
case 2:
case 4:
case 6:
case 7:
case 9:
case 11:
if (day > 31)
return -1;
break;
case 3:
case 5:
case 8:
case 10:
if (day > 30)
return -1;
break;
case 1:
days_in_february = 28;
if (year % 4 == 0) {
if (year % 100 != 0)
days_in_february = 29;
else if (year % 400 == 0)
days_in_february = 29;
}
if (day > days_in_february)
return -1;
break;
default:
return -1;
}
return 0;
}
/**
* eeprom_field_update_date() - update a date field which contains binary data
*
* This function takes a date string in the form of x/Mon/y (x and y are both
* decimal values), translates it to the binary representation, then writes it
* to the field.
*
* This function strictly enforces the data syntax, and will not update the
* field if there's any deviation from it. It also protects from overflow in the
* year value, and checks the validity of the date.
*
* @field: an initialized field
* @value: a date string
*
* Returns 0 on success, -1 on failure.
*/
int eeprom_field_update_date(struct eeprom_field *field, char *value)
{
char *endptr;
char *tok1 = strtok(value, "/");
char *tok2 = strtok(NULL, "/");
char *tok3 = strtok(NULL, "/");
if (tok1 == NULL || tok2 == NULL || tok3 == NULL) {
printf("%s: syntax error\n", field->name);
return -1;
}
unsigned char day = (unsigned char)simple_strtol(tok1, &endptr, 0);
if (*endptr != '\0' || day == 0) {
printf("%s: invalid day\n", field->name);
return -1;
}
unsigned char month;
for (month = 1; month <= 12; month++)
if (!strcmp(tok2, months[month - 1]))
break;
unsigned int year = simple_strtol(tok3, &endptr, 0);
if (*endptr != '\0') {
printf("%s: invalid year\n", field->name);
return -1;
}
if (validate_date(day, month - 1, year)) {
printf("%s: invalid date\n", field->name);
return -1;
}
if (year >> 16) {
printf("%s: year overflow\n", field->name);
return -1;
}
field->buf[0] = day;
field->buf[1] = month;
field->buf[2] = (unsigned char)year;
field->buf[3] = (unsigned char)(year >> 8);
return 0;
}
#define LAYOUT_VERSION_LEGACY 1
#define LAYOUT_VERSION_VER1 2
#define LAYOUT_VERSION_VER2 3
#define LAYOUT_VERSION_VER3 4
extern struct eeprom_field layout_unknown[1];
#define DEFINE_PRINT_UPDATE(x) eeprom_field_print_##x, eeprom_field_update_##x
#ifdef CONFIG_CM_T3X
struct eeprom_field layout_legacy[5] = {
{ "MAC address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Board Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin) },
{ "Serial Number", 8, NULL, DEFINE_PRINT_UPDATE(bin) },
{ "Board Configuration", 64, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ RESERVED_FIELDS, 176, NULL, eeprom_field_print_reserved,
eeprom_field_update_ascii },
};
#else
#define layout_legacy layout_unknown
#endif
#if defined(CONFIG_CM_T3X) || defined(CONFIG_CM_T3517)
struct eeprom_field layout_v1[12] = {
{ "Major Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "Minor Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "1st MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "2nd MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Production Date", 4, NULL, DEFINE_PRINT_UPDATE(date) },
{ "Serial Number", 12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
{ RESERVED_FIELDS, 96, NULL, DEFINE_PRINT_UPDATE(reserved) },
{ "Product Name", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #1", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #2", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #3", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ RESERVED_FIELDS, 64, NULL, eeprom_field_print_reserved,
eeprom_field_update_ascii },
};
#else
#define layout_v1 layout_unknown
#endif
struct eeprom_field layout_v2[15] = {
{ "Major Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "Minor Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "1st MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "2nd MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Production Date", 4, NULL, DEFINE_PRINT_UPDATE(date) },
{ "Serial Number", 12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
{ "3rd MAC Address (WIFI)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "4th MAC Address (Bluetooth)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Layout Version", 1, NULL, DEFINE_PRINT_UPDATE(bin) },
{ RESERVED_FIELDS, 83, NULL, DEFINE_PRINT_UPDATE(reserved) },
{ "Product Name", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #1", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #2", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #3", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ RESERVED_FIELDS, 64, NULL, eeprom_field_print_reserved,
eeprom_field_update_ascii },
};
struct eeprom_field layout_v3[16] = {
{ "Major Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "Minor Revision", 2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
{ "1st MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "2nd MAC Address", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Production Date", 4, NULL, DEFINE_PRINT_UPDATE(date) },
{ "Serial Number", 12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
{ "3rd MAC Address (WIFI)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "4th MAC Address (Bluetooth)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
{ "Layout Version", 1, NULL, DEFINE_PRINT_UPDATE(bin) },
{ "CompuLab EEPROM ID", 3, NULL, DEFINE_PRINT_UPDATE(bin) },
{ RESERVED_FIELDS, 80, NULL, DEFINE_PRINT_UPDATE(reserved) },
{ "Product Name", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #1", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #2", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ "Product Options #3", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
{ RESERVED_FIELDS, 64, NULL, eeprom_field_print_reserved,
eeprom_field_update_ascii },
};
void eeprom_layout_assign(struct eeprom_layout *layout, int layout_version)
{
switch (layout->layout_version) {
case LAYOUT_VERSION_LEGACY:
layout->fields = layout_legacy;
layout->num_of_fields = ARRAY_SIZE(layout_legacy);
break;
case LAYOUT_VERSION_VER1:
layout->fields = layout_v1;
layout->num_of_fields = ARRAY_SIZE(layout_v1);
break;
case LAYOUT_VERSION_VER2:
layout->fields = layout_v2;
layout->num_of_fields = ARRAY_SIZE(layout_v2);
break;
case LAYOUT_VERSION_VER3:
layout->fields = layout_v3;
layout->num_of_fields = ARRAY_SIZE(layout_v3);
break;
default:
__eeprom_layout_assign(layout, layout_version);
}
}
int eeprom_parse_layout_version(char *str)
{
if (!strcmp(str, "legacy"))
return LAYOUT_VERSION_LEGACY;
else if (!strcmp(str, "v1"))
return LAYOUT_VERSION_VER1;
else if (!strcmp(str, "v2"))
return LAYOUT_VERSION_VER2;
else if (!strcmp(str, "v3"))
return LAYOUT_VERSION_VER3;
else
return LAYOUT_VERSION_UNRECOGNIZED;
}
int eeprom_layout_detect(unsigned char *data)
{
switch (data[EEPROM_LAYOUT_VER_OFFSET]) {
case 0xff:
case 0:
return LAYOUT_VERSION_VER1;
case 2:
return LAYOUT_VERSION_VER2;
case 3:
return LAYOUT_VERSION_VER3;
}
if (data[EEPROM_LAYOUT_VER_OFFSET] >= 0x20)
return LAYOUT_VERSION_LEGACY;
return LAYOUT_VERSION_UNRECOGNIZED;
}
#endif