diff options
Diffstat (limited to 'board/compulab/cm_t35/eeprom.c')
| -rw-r--r-- | board/compulab/cm_t35/eeprom.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/board/compulab/cm_t35/eeprom.c b/board/compulab/cm_t35/eeprom.c new file mode 100644 index 0000000..b0af103 --- /dev/null +++ b/board/compulab/cm_t35/eeprom.c @@ -0,0 +1,130 @@ +/* + * (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; +}; |