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 #define EEPROM_LAYOUT_VER_OFFSET 44 19 #define BOARD_SERIAL_OFFSET 20 20 #define BOARD_SERIAL_OFFSET_LEGACY 8 21 #define BOARD_REV_OFFSET 0 22 #define BOARD_REV_OFFSET_LEGACY 6 23 #define BOARD_REV_SIZE 2 24 #define MAC_ADDR_OFFSET 4 25 #define MAC_ADDR_OFFSET_LEGACY 0 26 27 #define LAYOUT_INVALID 0 28 #define LAYOUT_LEGACY 0xff 29 30 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */ 31 32 static int cl_eeprom_read(uint offset, uchar *buf, int len) 33 { 34 return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset, 35 CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len); 36 } 37 38 static int cl_eeprom_setup_layout(void) 39 { 40 int res; 41 42 if (cl_eeprom_layout != LAYOUT_INVALID) 43 return 0; 44 45 res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET, 46 (uchar *)&cl_eeprom_layout, 1); 47 if (res) { 48 cl_eeprom_layout = LAYOUT_INVALID; 49 return res; 50 } 51 52 if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20) 53 cl_eeprom_layout = LAYOUT_LEGACY; 54 55 return 0; 56 } 57 58 void get_board_serial(struct tag_serialnr *serialnr) 59 { 60 u32 serial[2]; 61 uint offset; 62 63 memset(serialnr, 0, sizeof(*serialnr)); 64 65 if (cl_eeprom_setup_layout()) 66 return; 67 68 offset = (cl_eeprom_layout != LAYOUT_LEGACY) ? 69 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY; 70 71 if (cl_eeprom_read(offset, (uchar *)serial, 8)) 72 return; 73 74 if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) { 75 serialnr->low = serial[0]; 76 serialnr->high = serial[1]; 77 } 78 } 79 80 /* 81 * Routine: cl_eeprom_read_mac_addr 82 * Description: read mac address and store it in buf. 83 */ 84 int cl_eeprom_read_mac_addr(uchar *buf) 85 { 86 uint offset; 87 88 if (cl_eeprom_setup_layout()) 89 return 0; 90 91 offset = (cl_eeprom_layout != LAYOUT_LEGACY) ? 92 MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY; 93 94 return cl_eeprom_read(offset, buf, 6); 95 } 96 97 /* 98 * Routine: cl_eeprom_get_board_rev 99 * Description: read system revision from eeprom 100 */ 101 u32 cl_eeprom_get_board_rev(void) 102 { 103 u32 rev = 0; 104 char str[5]; /* Legacy representation can contain at most 4 digits */ 105 uint offset = BOARD_REV_OFFSET_LEGACY; 106 107 if (cl_eeprom_setup_layout()) 108 return 0; 109 110 if (cl_eeprom_layout != LAYOUT_LEGACY) 111 offset = BOARD_REV_OFFSET; 112 113 if (cl_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE)) 114 return 0; 115 116 /* 117 * Convert legacy syntactic representation to semantic 118 * representation. i.e. for rev 1.00: 0x100 --> 0x64 119 */ 120 if (cl_eeprom_layout == LAYOUT_LEGACY) { 121 sprintf(str, "%x", rev); 122 rev = simple_strtoul(str, NULL, 10); 123 } 124 125 return rev; 126 }; 127