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 int res; 35 unsigned int current_i2c_bus = i2c_get_bus_num(); 36 37 res = i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS); 38 if (res < 0) 39 return res; 40 41 res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset, 42 CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len); 43 44 i2c_set_bus_num(current_i2c_bus); 45 46 return res; 47 } 48 49 static int cl_eeprom_setup_layout(void) 50 { 51 int res; 52 53 if (cl_eeprom_layout != LAYOUT_INVALID) 54 return 0; 55 56 res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET, 57 (uchar *)&cl_eeprom_layout, 1); 58 if (res) { 59 cl_eeprom_layout = LAYOUT_INVALID; 60 return res; 61 } 62 63 if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20) 64 cl_eeprom_layout = LAYOUT_LEGACY; 65 66 return 0; 67 } 68 69 void get_board_serial(struct tag_serialnr *serialnr) 70 { 71 u32 serial[2]; 72 uint offset; 73 74 memset(serialnr, 0, sizeof(*serialnr)); 75 76 if (cl_eeprom_setup_layout()) 77 return; 78 79 offset = (cl_eeprom_layout != LAYOUT_LEGACY) ? 80 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY; 81 82 if (cl_eeprom_read(offset, (uchar *)serial, 8)) 83 return; 84 85 if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) { 86 serialnr->low = serial[0]; 87 serialnr->high = serial[1]; 88 } 89 } 90 91 /* 92 * Routine: cl_eeprom_read_mac_addr 93 * Description: read mac address and store it in buf. 94 */ 95 int cl_eeprom_read_mac_addr(uchar *buf) 96 { 97 uint offset; 98 99 if (cl_eeprom_setup_layout()) 100 return 0; 101 102 offset = (cl_eeprom_layout != LAYOUT_LEGACY) ? 103 MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY; 104 105 return cl_eeprom_read(offset, buf, 6); 106 } 107 108 /* 109 * Routine: cl_eeprom_get_board_rev 110 * Description: read system revision from eeprom 111 */ 112 u32 cl_eeprom_get_board_rev(void) 113 { 114 u32 rev = 0; 115 char str[5]; /* Legacy representation can contain at most 4 digits */ 116 uint offset = BOARD_REV_OFFSET_LEGACY; 117 118 if (cl_eeprom_setup_layout()) 119 return 0; 120 121 if (cl_eeprom_layout != LAYOUT_LEGACY) 122 offset = BOARD_REV_OFFSET; 123 124 if (cl_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE)) 125 return 0; 126 127 /* 128 * Convert legacy syntactic representation to semantic 129 * representation. i.e. for rev 1.00: 0x100 --> 0x64 130 */ 131 if (cl_eeprom_layout == LAYOUT_LEGACY) { 132 sprintf(str, "%x", rev); 133 rev = simple_strtoul(str, NULL, 10); 134 } 135 136 return rev; 137 }; 138