1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 PHYTEC Messtechnik GmbH 4 * Author: Wadim Egorov <w.egorov (at) phytec.de> 5 */ 6 7 #include <asm/io.h> 8 #include <common.h> 9 #include <dm.h> 10 #include <environment.h> 11 #include <i2c.h> 12 #include <i2c_eeprom.h> 13 #include <netdev.h> 14 #include "som.h" 15 16 static int valid_rk3288_som(struct rk3288_som *som) 17 { 18 unsigned char *p = (unsigned char *)som; 19 unsigned char *e = p + sizeof(struct rk3288_som) - 1; 20 int hw = 0; 21 22 while (p < e) { 23 hw += hweight8(*p); 24 p++; 25 } 26 27 return hw == som->bs; 28 } 29 30 int rk_board_late_init(void) 31 { 32 int ret; 33 struct udevice *dev; 34 struct rk3288_som opt; 35 int off; 36 37 /* Get the identificatioin page of M24C32-D EEPROM */ 38 off = fdt_path_offset(gd->fdt_blob, "eeprom0"); 39 if (off < 0) { 40 printf("%s: No eeprom0 path offset\n", __func__); 41 return off; 42 } 43 44 ret = uclass_get_device_by_of_offset(UCLASS_I2C_EEPROM, off, &dev); 45 if (ret) { 46 printf("%s: Could not find EEPROM\n", __func__); 47 return ret; 48 } 49 50 ret = i2c_set_chip_offset_len(dev, 2); 51 if (ret) 52 return ret; 53 54 ret = i2c_eeprom_read(dev, 0, (uint8_t *)&opt, 55 sizeof(struct rk3288_som)); 56 if (ret) { 57 printf("%s: Could not read EEPROM\n", __func__); 58 return ret; 59 } 60 61 if (opt.api_version != 0 || !valid_rk3288_som(&opt)) { 62 printf("Invalid data or wrong EEPROM layout version.\n"); 63 /* Proceed anyway, since there is no fallback option */ 64 } 65 66 if (is_valid_ethaddr(opt.mac)) 67 eth_env_set_enetaddr("ethaddr", opt.mac); 68 69 return 0; 70 } 71
