qemu/roms/u-boot/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 #define EEPROM_LAYOUT_VER_OFFSET        44
  14 #define BOARD_SERIAL_OFFSET             20
  15 #define BOARD_SERIAL_OFFSET_LEGACY      8
  16 #define BOARD_REV_OFFSET                0
  17 #define BOARD_REV_OFFSET_LEGACY         6
  18 #define BOARD_REV_SIZE                  2
  19 #define MAC_ADDR_OFFSET                 4
  20 #define MAC_ADDR_OFFSET_LEGACY          0
  21
  22 #define LAYOUT_INVALID  0
  23 #define LAYOUT_LEGACY   0xff
  24
  25 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
  26
  27 static int cl_eeprom_read(uint offset, uchar *buf, int len)
  28 {
  29         return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
  30                         CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
  31 }
  32
  33 static int cl_eeprom_setup_layout(void)
  34 {
  35         int res;
  36
  37         if (cl_eeprom_layout != LAYOUT_INVALID)
  38                 return 0;
  39
  40         res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
  41                              (uchar *)&cl_eeprom_layout, 1);
  42         if (res) {
  43                 cl_eeprom_layout = LAYOUT_INVALID;
  44                 return res;
  45         }
  46
  47         if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
  48                 cl_eeprom_layout = LAYOUT_LEGACY;
  49
  50         return 0;
  51 }
  52
  53 void get_board_serial(struct tag_serialnr *serialnr)
  54 {
  55         u32 serial[2];
  56         uint offset;
  57
  58         memset(serialnr, 0, sizeof(*serialnr));
  59
  60         if (cl_eeprom_setup_layout())
  61                 return;
  62
  63         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
  64                 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
  65
  66         if (cl_eeprom_read(offset, (uchar *)serial, 8))
  67                 return;
  68
  69         if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
  70                 serialnr->low = serial[0];
  71                 serialnr->high = serial[1];
  72         }
  73 }
  74
  75 /*
  76  * Routine: cl_eeprom_read_mac_addr
  77  * Description: read mac address and store it in buf.
  78  */
  79 int cl_eeprom_read_mac_addr(uchar *buf)
  80 {
  81         uint offset;
  82
  83         if (cl_eeprom_setup_layout())
  84                 return 0;
  85
  86         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
  87                         MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
  88
  89         return cl_eeprom_read(offset, buf, 6);
  90 }
  91
  92 /*
  93  * Routine: cl_eeprom_get_board_rev
  94  * Description: read system revision from eeprom
  95  */
  96 u32 cl_eeprom_get_board_rev(void)
  97 {
  98         u32 rev = 0;
  99         char str[5]; /* Legacy representation can contain at most 4 digits */
 100         uint offset = BOARD_REV_OFFSET_LEGACY;
 101
 102         if (cl_eeprom_setup_layout())
 103                 return 0;
 104
 105         if (cl_eeprom_layout != LAYOUT_LEGACY)
 106                 offset = BOARD_REV_OFFSET;
 107
 108         if (cl_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
 109                 return 0;
 110
 111         /*
 112          * Convert legacy syntactic representation to semantic
 113          * representation. i.e. for rev 1.00: 0x100 --> 0x64
 114          */
 115         if (cl_eeprom_layout == LAYOUT_LEGACY) {
 116                 sprintf(str, "%x", rev);
 117                 rev = simple_strtoul(str, NULL, 10);
 118         }
 119
 120         return rev;
 121 };