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/*
* (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Nikita Kiryanov <nikita@compulab.co.il>
* Igor Grinberg <grinberg@compulab.co.il>
*
* 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.
*/
#include <common.h>
#include <i2c.h>
#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 MAC_ADDR_OFFSET 4
#define MAC_ADDR_OFFSET_LEGACY 0
#define LAYOUT_INVALID 0
#define LAYOUT_LEGACY 0xff
static int eeprom_layout; /* Implicitly LAYOUT_INVALID */
static int cm_t3x_eeprom_read(uint offset, uchar *buf, int len)
{
return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
}
static int eeprom_setup_layout(void)
{
int res;
if (eeprom_layout != LAYOUT_INVALID)
return 0;
res = cm_t3x_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
(uchar *)&eeprom_layout, 1);
if (res) {
eeprom_layout = LAYOUT_INVALID;
return res;
}
if (eeprom_layout == 0 || eeprom_layout >= 0x20)
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 (eeprom_setup_layout())
return;
offset = (eeprom_layout != LAYOUT_LEGACY) ?
BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
if (cm_t3x_eeprom_read(offset, (uchar *)serial, 8))
return;
if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
serialnr->low = serial[0];
serialnr->high = serial[1];
}
}
/*
* Routine: cm_t3x_eeprom_read_mac_addr
* Description: read mac address and store it in buf.
*/
int cm_t3x_eeprom_read_mac_addr(uchar *buf)
{
uint offset;
if (eeprom_setup_layout())
return 0;
offset = (eeprom_layout != LAYOUT_LEGACY) ?
MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
return cm_t3x_eeprom_read(offset, buf, 6);
}
/*
* Routine: cm_t3x_eeprom_get_board_rev
* Description: read system revision from eeprom
*/
u32 cm_t3x_eeprom_get_board_rev(void)
{
u32 rev = 0;
char str[5]; /* Legacy representation can contain at most 4 digits */
uint offset = BOARD_REV_OFFSET_LEGACY;
if (eeprom_setup_layout())
return 0;
if (eeprom_layout != LAYOUT_LEGACY)
offset = BOARD_REV_OFFSET;
if (cm_t3x_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
return 0;
/*
* Convert legacy syntactic representation to semantic
* representation. i.e. for rev 1.00: 0x100 --> 0x64
*/
if (eeprom_layout == LAYOUT_LEGACY) {
sprintf(str, "%x", rev);
rev = simple_strtoul(str, NULL, 10);
}
return rev;
};
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