122 lines
2.6 KiB
C
122 lines
2.6 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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* SPDX-License-Identifier: GPL-2.0+
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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 cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
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static int cl_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 cl_eeprom_setup_layout(void)
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{
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int res;
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if (cl_eeprom_layout != LAYOUT_INVALID)
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return 0;
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res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
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(uchar *)&cl_eeprom_layout, 1);
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if (res) {
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cl_eeprom_layout = LAYOUT_INVALID;
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return res;
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}
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if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
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cl_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 (cl_eeprom_setup_layout())
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return;
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offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
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BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
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if (cl_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: cl_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 cl_eeprom_read_mac_addr(uchar *buf)
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{
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uint offset;
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if (cl_eeprom_setup_layout())
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return 0;
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offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
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MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
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return cl_eeprom_read(offset, buf, 6);
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}
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/*
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* Routine: cl_eeprom_get_board_rev
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* Description: read system revision from eeprom
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*/
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u32 cl_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 (cl_eeprom_setup_layout())
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return 0;
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if (cl_eeprom_layout != LAYOUT_LEGACY)
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offset = BOARD_REV_OFFSET;
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if (cl_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 (cl_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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