git.sur5r.net Git - u-boot/blob - board/compulab/common/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  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <i2c.h>
  12
  13 #ifndef CONFIG_SYS_I2C_EEPROM_ADDR
  14 # define CONFIG_SYS_I2C_EEPROM_ADDR     0x50
  15 # define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
  16 #endif
  17
  18 #ifndef CONFIG_SYS_I2C_EEPROM_BUS
  19 #define CONFIG_SYS_I2C_EEPROM_BUS       0
  20 #endif
  21
  22 #define EEPROM_LAYOUT_VER_OFFSET        44
  23 #define BOARD_SERIAL_OFFSET             20
  24 #define BOARD_SERIAL_OFFSET_LEGACY      8
  25 #define BOARD_REV_OFFSET                0
  26 #define BOARD_REV_OFFSET_LEGACY         6
  27 #define BOARD_REV_SIZE                  2
  28 #define MAC_ADDR_OFFSET                 4
  29 #define MAC_ADDR_OFFSET_LEGACY          0
  30
  31 #define LAYOUT_INVALID  0
  32 #define LAYOUT_LEGACY   0xff
  33
  34 static int cl_eeprom_bus;
  35 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
  36
  37 static int cl_eeprom_read(uint offset, uchar *buf, int len)
  38 {
  39         int res;
  40         unsigned int current_i2c_bus = i2c_get_bus_num();
  41
  42         res = i2c_set_bus_num(cl_eeprom_bus);
  43         if (res < 0)
  44                 return res;
  45
  46         res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
  47                         CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
  48
  49         i2c_set_bus_num(current_i2c_bus);
  50
  51         return res;
  52 }
  53
  54 static int cl_eeprom_setup(uint eeprom_bus)
  55 {
  56         int res;
  57
  58         /*
  59          * We know the setup was already done when the layout is set to a valid
  60          * value and we're using the same bus as before.
  61          */
  62         if (cl_eeprom_layout != LAYOUT_INVALID && eeprom_bus == cl_eeprom_bus)
  63                 return 0;
  64
  65         cl_eeprom_bus = eeprom_bus;
  66         res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
  67                              (uchar *)&cl_eeprom_layout, 1);
  68         if (res) {
  69                 cl_eeprom_layout = LAYOUT_INVALID;
  70                 return res;
  71         }
  72
  73         if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
  74                 cl_eeprom_layout = LAYOUT_LEGACY;
  75
  76         return 0;
  77 }
  78
  79 void get_board_serial(struct tag_serialnr *serialnr)
  80 {
  81         u32 serial[2];
  82         uint offset;
  83
  84         memset(serialnr, 0, sizeof(*serialnr));
  85
  86         if (cl_eeprom_setup(CONFIG_SYS_I2C_EEPROM_BUS))
  87                 return;
  88
  89         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
  90                 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
  91
  92         if (cl_eeprom_read(offset, (uchar *)serial, 8))
  93                 return;
  94
  95         if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
  96                 serialnr->low = serial[0];
  97                 serialnr->high = serial[1];
  98         }
  99 }
 100
 101 /*
 102  * Routine: cl_eeprom_read_mac_addr
 103  * Description: read mac address and store it in buf.
 104  */
 105 int cl_eeprom_read_mac_addr(uchar *buf, uint eeprom_bus)
 106 {
 107         uint offset;
 108
 109         if (cl_eeprom_setup(eeprom_bus))
 110                 return 0;
 111
 112         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
 113                         MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
 114
 115         return cl_eeprom_read(offset, buf, 6);
 116 }
 117
 118 static u32 board_rev;
 119
 120 /*
 121  * Routine: cl_eeprom_get_board_rev
 122  * Description: read system revision from eeprom
 123  */
 124 u32 cl_eeprom_get_board_rev(void)
 125 {
 126         char str[5]; /* Legacy representation can contain at most 4 digits */
 127         uint offset = BOARD_REV_OFFSET_LEGACY;
 128
 129         if (board_rev)
 130                 return board_rev;
 131
 132         if (cl_eeprom_setup(CONFIG_SYS_I2C_EEPROM_BUS))
 133                 return 0;
 134
 135         if (cl_eeprom_layout != LAYOUT_LEGACY)
 136                 offset = BOARD_REV_OFFSET;
 137
 138         if (cl_eeprom_read(offset, (uchar *)&board_rev, BOARD_REV_SIZE))
 139                 return 0;
 140
 141         /*
 142          * Convert legacy syntactic representation to semantic
 143          * representation. i.e. for rev 1.00: 0x100 --> 0x64
 144          */
 145         if (cl_eeprom_layout == LAYOUT_LEGACY) {
 146                 sprintf(str, "%x", board_rev);
 147                 board_rev = simple_strtoul(str, NULL, 10);
 148         }
 149
 150         return board_rev;
 151 };