/* * (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; };