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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>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.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 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;
if (cl_eeprom_setup(eeprom_bus))
return 0;
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(void)
{
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(CONFIG_SYS_I2C_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;
};
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