1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2017 PHYTEC Messtechnik GmbH 4 * Author: Wadim Egorov <w.egorov@phytec.de> 5 */ 6 7#include <eeprom.h> 8#include <init.h> 9#include <log.h> 10#include <net.h> 11#include <asm/global_data.h> 12#include <asm/io.h> 13#include <common.h> 14#include <dm.h> 15#include <env.h> 16#include <env_internal.h> 17#include <i2c.h> 18#include <i2c_eeprom.h> 19#include <netdev.h> 20#include <linux/bitops.h> 21#include "som.h" 22 23static int valid_rk3288_som(struct rk3288_som *som) 24{ 25 unsigned char *p = (unsigned char *)som; 26 unsigned char *e = p + sizeof(struct rk3288_som) - 1; 27 int hw = 0; 28 29 while (p < e) { 30 hw += hweight8(*p); 31 p++; 32 } 33 34 return hw == som->bs; 35} 36 37int rk3288_board_late_init(void) 38{ 39 int ret; 40 struct udevice *dev; 41 struct rk3288_som opt; 42 int off; 43 44 /* Get the identificatioin page of M24C32-D EEPROM */ 45 off = fdt_path_offset(gd->fdt_blob, "eeprom0"); 46 if (off < 0) { 47 printf("%s: No eeprom0 path offset\n", __func__); 48 return off; 49 } 50 51 ret = uclass_get_device_by_of_offset(UCLASS_I2C_EEPROM, off, &dev); 52 if (ret) { 53 printf("%s: Could not find EEPROM\n", __func__); 54 return ret; 55 } 56 57 ret = i2c_set_chip_offset_len(dev, 2); 58 if (ret) 59 return ret; 60 61 ret = i2c_eeprom_read(dev, 0, (uint8_t *)&opt, 62 sizeof(struct rk3288_som)); 63 if (ret) { 64 printf("%s: Could not read EEPROM\n", __func__); 65 return ret; 66 } 67 68 if (opt.api_version != 0 || !valid_rk3288_som(&opt)) { 69 printf("Invalid data or wrong EEPROM layout version.\n"); 70 /* Proceed anyway, since there is no fallback option */ 71 } 72 73 if (is_valid_ethaddr(opt.mac)) 74 eth_env_set_enetaddr("ethaddr", opt.mac); 75 76 return 0; 77} 78