LXR uboot/board/cm_t35/eeprom.c

   1/*
   2 * (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
   3 *
   4 * Authors: Nikita Kiryanov <nikita@compulab.co.il>
   5 *          Igor Grinberg <grinberg@compulab.co.il>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation; either version 2 of
  10 * the License, or (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc.
  20 */
  21
  22#include <common.h>
  23#include <i2c.h>
  24
  25#define EEPROM_LAYOUT_VER_OFFSET        44
  26#define BOARD_SERIAL_OFFSET             20
  27#define BOARD_SERIAL_OFFSET_LEGACY      8
  28#define BOARD_REV_OFFSET                0
  29#define BOARD_REV_OFFSET_LEGACY         6
  30#define BOARD_REV_SIZE                  4
  31#define BOARD_REV_SIZE_LEGACY           2
  32#define MAC_ADDR_OFFSET                 4
  33#define MAC_ADDR_OFFSET_LEGACY          0
  34
  35#define LAYOUT_INVALID  0
  36#define LAYOUT_LEGACY   0xff
  37
  38static int eeprom_layout; /* Implicitly LAYOUT_INVALID */
  39
  40static int cm_t3x_eeprom_read(uint offset, uchar *buf, int len)
  41{
  42        return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
  43                        CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
  44}
  45
  46static int eeprom_setup_layout(void)
  47{
  48        int res;
  49
  50        if (eeprom_layout != LAYOUT_INVALID)
  51                return 0;
  52
  53        res = cm_t3x_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
  54                                                (uchar *)&eeprom_layout, 1);
  55        if (res) {
  56                eeprom_layout = LAYOUT_INVALID;
  57                return res;
  58        }
  59
  60        if (eeprom_layout == 0 || eeprom_layout >= 0x20)
  61                eeprom_layout = LAYOUT_LEGACY;
  62
  63        return 0;
  64}
  65
  66void get_board_serial(struct tag_serialnr *serialnr)
  67{
  68        u32 serial[2];
  69        uint offset;
  70
  71        memset(serialnr, 0, sizeof(*serialnr));
  72        if (eeprom_setup_layout())
  73                return;
  74
  75        offset = (eeprom_layout != LAYOUT_LEGACY) ?
  76                        BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
  77        if (cm_t3x_eeprom_read(offset, (uchar *)serial, 8))
  78                return;
  79
  80        if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
  81                serialnr->low = serial[0];
  82                serialnr->high = serial[1];
  83        }
  84}
  85
  86/*
  87 * Routine: cm_t3x_eeprom_read_mac_addr
  88 * Description: read mac address and store it in buf.
  89 */
  90int cm_t3x_eeprom_read_mac_addr(uchar *buf)
  91{
  92        uint offset;
  93
  94        if (eeprom_setup_layout())
  95                return 0;
  96
  97        offset = (eeprom_layout != LAYOUT_LEGACY) ?
  98                        MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
  99        return cm_t3x_eeprom_read(offset, buf, 6);
 100}
 101
 102/*
 103 * Routine: get_board_rev
 104 * Description: read system revision
 105 */
 106u32 get_board_rev(void)
 107{
 108        u32 rev = 0;
 109        uint offset = BOARD_REV_OFFSET_LEGACY;
 110        int len = BOARD_REV_SIZE_LEGACY;
 111
 112        if (eeprom_setup_layout())
 113                return 0;
 114
 115        if (eeprom_layout != LAYOUT_LEGACY) {
 116                offset = BOARD_REV_OFFSET;
 117                len = BOARD_REV_SIZE;
 118        }
 119
 120        if (cm_t3x_eeprom_read(offset, (uchar *)&rev, len))
 121                return 0;
 122
 123        return rev;
 124};
 125