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2ef6302f87
Legacy eeprom layout represents the revision number syntactically (i.e. revision 1.00 is written as 0x100). This is inconsistent with the representation in newer layouts, where it is defined semantically (i.e. 0x64). This patch fixes the issue by replacing the syntactic representation with the semantic one. Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
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*
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* Authors: Nikita Kiryanov <nikita@compulab.co.il>
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* Igor Grinberg <grinberg@compulab.co.il>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.
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*/
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#include <common.h>
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#include <i2c.h>
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#define EEPROM_LAYOUT_VER_OFFSET 44
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#define BOARD_SERIAL_OFFSET 20
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#define BOARD_SERIAL_OFFSET_LEGACY 8
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#define BOARD_REV_OFFSET 0
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#define BOARD_REV_OFFSET_LEGACY 6
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#define BOARD_REV_SIZE 2
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#define MAC_ADDR_OFFSET 4
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#define MAC_ADDR_OFFSET_LEGACY 0
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#define LAYOUT_INVALID 0
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#define LAYOUT_LEGACY 0xff
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static int eeprom_layout; /* Implicitly LAYOUT_INVALID */
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static int cm_t3x_eeprom_read(uint offset, uchar *buf, int len)
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{
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return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
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CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
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}
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static int eeprom_setup_layout(void)
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{
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int res;
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if (eeprom_layout != LAYOUT_INVALID)
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return 0;
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res = cm_t3x_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
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(uchar *)&eeprom_layout, 1);
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if (res) {
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eeprom_layout = LAYOUT_INVALID;
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return res;
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}
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if (eeprom_layout == 0 || eeprom_layout >= 0x20)
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eeprom_layout = LAYOUT_LEGACY;
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return 0;
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}
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void get_board_serial(struct tag_serialnr *serialnr)
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{
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u32 serial[2];
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uint offset;
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memset(serialnr, 0, sizeof(*serialnr));
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if (eeprom_setup_layout())
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return;
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offset = (eeprom_layout != LAYOUT_LEGACY) ?
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BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
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if (cm_t3x_eeprom_read(offset, (uchar *)serial, 8))
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return;
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if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
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serialnr->low = serial[0];
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serialnr->high = serial[1];
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}
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}
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/*
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* Routine: cm_t3x_eeprom_read_mac_addr
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* Description: read mac address and store it in buf.
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*/
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int cm_t3x_eeprom_read_mac_addr(uchar *buf)
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{
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uint offset;
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if (eeprom_setup_layout())
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return 0;
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offset = (eeprom_layout != LAYOUT_LEGACY) ?
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MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
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return cm_t3x_eeprom_read(offset, buf, 6);
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}
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/*
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* Routine: get_board_rev
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* Description: read system revision
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*/
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u32 get_board_rev(void)
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{
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u32 rev = 0;
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char str[5]; /* Legacy representation can contain at most 4 digits */
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uint offset = BOARD_REV_OFFSET_LEGACY;
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if (eeprom_setup_layout())
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return 0;
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if (eeprom_layout != LAYOUT_LEGACY)
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offset = BOARD_REV_OFFSET;
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if (cm_t3x_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
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return 0;
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/*
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* Convert legacy syntactic representation to semantic
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* representation. i.e. for rev 1.00: 0x100 --> 0x64
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*/
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if (eeprom_layout == LAYOUT_LEGACY) {
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sprintf(str, "%x", rev);
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rev = simple_strtoul(str, NULL, 10);
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}
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return rev;
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};
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