1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2022 Marek Vasut <marex@denx.de>
4  * Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <i2c_eeprom.h>
10 #include <net.h>
11 
12 #include "dh_common.h"
13 
dh_mac_is_in_env(const char * env)14 bool dh_mac_is_in_env(const char *env)
15 {
16 	unsigned char enetaddr[6];
17 
18 	return eth_env_get_enetaddr(env, enetaddr);
19 }
20 
dh_get_mac_from_eeprom(unsigned char * enetaddr,const char * alias)21 int dh_get_mac_from_eeprom(unsigned char *enetaddr, const char *alias)
22 {
23 	struct udevice *dev;
24 	int ret;
25 	ofnode node;
26 
27 	node = ofnode_path(alias);
28 	if (!ofnode_valid(node)) {
29 		printf("%s: ofnode for %s not found!", __func__, alias);
30 		return -ENOENT;
31 	}
32 
33 	ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, node, &dev);
34 	if (ret) {
35 		printf("%s: Cannot find EEPROM! ret = %d\n", __func__, ret);
36 		return ret;
37 	}
38 
39 	ret = i2c_eeprom_read(dev, 0xfa, enetaddr, 0x6);
40 	if (ret) {
41 		printf("%s: Error reading EEPROM! ret = %d\n", __func__, ret);
42 		return ret;
43 	}
44 
45 	if (!is_valid_ethaddr(enetaddr)) {
46 		printf("%s: Address read from EEPROM is invalid!\n", __func__);
47 		return -EINVAL;
48 	}
49 
50 	return 0;
51 }
52 
dh_setup_mac_address(void)53 __weak int dh_setup_mac_address(void)
54 {
55 	unsigned char enetaddr[6];
56 
57 	if (dh_mac_is_in_env("ethaddr"))
58 		return 0;
59 
60 	if (!dh_get_mac_from_eeprom(enetaddr, "eeprom0"))
61 		return eth_env_set_enetaddr("ethaddr", enetaddr);
62 
63 	printf("%s: Unable to set mac address!\n", __func__);
64 	return -ENXIO;
65 }
66