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8c318eb3a0
Buffer the PCB revision to avoid multiple eeprom accesses for the same data and print it as a part of board information. Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Signed-off-by: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Tom Rini <trini@ti.com>
131 lines
3.2 KiB
C
131 lines
3.2 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: cm_t3x_eeprom_get_board_rev
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* Description: read system revision from eeprom
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*/
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u32 cm_t3x_eeprom_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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