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https://github.com/AsahiLinux/u-boot
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72898ac7b8
Add support for selecting which eeprom is queried for board revision by extending cl_eeprom_get_board_rev() to accept an i2c bus number. Cc: Stefano Babic <sbabic@denx.de> Cc: Igor Grinberg <grinberg@compulab.co.il> Acked-by: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
151 lines
3.3 KiB
C
151 lines
3.3 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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#ifndef CONFIG_SYS_I2C_EEPROM_ADDR
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# define CONFIG_SYS_I2C_EEPROM_ADDR 0x50
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# define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
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#endif
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#ifndef CONFIG_SYS_I2C_EEPROM_BUS
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#define CONFIG_SYS_I2C_EEPROM_BUS 0
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#endif
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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_bus;
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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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int res;
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unsigned int current_i2c_bus = i2c_get_bus_num();
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res = i2c_set_bus_num(cl_eeprom_bus);
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if (res < 0)
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return res;
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res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
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CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
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i2c_set_bus_num(current_i2c_bus);
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return res;
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}
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static int cl_eeprom_setup(uint eeprom_bus)
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{
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int res;
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/*
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* We know the setup was already done when the layout is set to a valid
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* value and we're using the same bus as before.
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*/
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if (cl_eeprom_layout != LAYOUT_INVALID && eeprom_bus == cl_eeprom_bus)
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return 0;
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cl_eeprom_bus = eeprom_bus;
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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(CONFIG_SYS_I2C_EEPROM_BUS))
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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, uint eeprom_bus)
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{
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uint offset;
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if (cl_eeprom_setup(eeprom_bus))
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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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static u32 board_rev;
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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(uint eeprom_bus)
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{
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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 (board_rev)
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return board_rev;
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if (cl_eeprom_setup(eeprom_bus))
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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 *)&board_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", board_rev);
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board_rev = simple_strtoul(str, NULL, 10);
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}
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return board_rev;
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};
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