1*4882a593Smuzhiyun // SPDX-License-Identifier: ISC
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun #include <linux/of.h>
6*4882a593Smuzhiyun #include <linux/of_net.h>
7*4882a593Smuzhiyun #include <linux/mtd/mtd.h>
8*4882a593Smuzhiyun #include <linux/mtd/partitions.h>
9*4882a593Smuzhiyun #include <linux/etherdevice.h>
10*4882a593Smuzhiyun #include "mt76.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun static int
mt76_get_of_eeprom(struct mt76_dev * dev,int len)13*4882a593Smuzhiyun mt76_get_of_eeprom(struct mt76_dev *dev, int len)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun #if defined(CONFIG_OF) && defined(CONFIG_MTD)
16*4882a593Smuzhiyun struct device_node *np = dev->dev->of_node;
17*4882a593Smuzhiyun struct mtd_info *mtd;
18*4882a593Smuzhiyun const __be32 *list;
19*4882a593Smuzhiyun const char *part;
20*4882a593Smuzhiyun phandle phandle;
21*4882a593Smuzhiyun int offset = 0;
22*4882a593Smuzhiyun int size;
23*4882a593Smuzhiyun size_t retlen;
24*4882a593Smuzhiyun int ret;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (!np)
27*4882a593Smuzhiyun return -ENOENT;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun list = of_get_property(np, "mediatek,mtd-eeprom", &size);
30*4882a593Smuzhiyun if (!list)
31*4882a593Smuzhiyun return -ENOENT;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun phandle = be32_to_cpup(list++);
34*4882a593Smuzhiyun if (!phandle)
35*4882a593Smuzhiyun return -ENOENT;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun np = of_find_node_by_phandle(phandle);
38*4882a593Smuzhiyun if (!np)
39*4882a593Smuzhiyun return -EINVAL;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun part = of_get_property(np, "label", NULL);
42*4882a593Smuzhiyun if (!part)
43*4882a593Smuzhiyun part = np->name;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun mtd = get_mtd_device_nm(part);
46*4882a593Smuzhiyun if (IS_ERR(mtd)) {
47*4882a593Smuzhiyun ret = PTR_ERR(mtd);
48*4882a593Smuzhiyun goto out_put_node;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun if (size <= sizeof(*list)) {
52*4882a593Smuzhiyun ret = -EINVAL;
53*4882a593Smuzhiyun goto out_put_node;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun offset = be32_to_cpup(list);
57*4882a593Smuzhiyun ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
58*4882a593Smuzhiyun put_mtd_device(mtd);
59*4882a593Smuzhiyun if (ret)
60*4882a593Smuzhiyun goto out_put_node;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun if (retlen < len) {
63*4882a593Smuzhiyun ret = -EINVAL;
64*4882a593Smuzhiyun goto out_put_node;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
68*4882a593Smuzhiyun u8 *data = (u8 *)dev->eeprom.data;
69*4882a593Smuzhiyun int i;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun /* convert eeprom data in Little Endian */
72*4882a593Smuzhiyun for (i = 0; i < round_down(len, 2); i += 2)
73*4882a593Smuzhiyun put_unaligned_le16(get_unaligned_be16(&data[i]),
74*4882a593Smuzhiyun &data[i]);
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun #ifdef CONFIG_NL80211_TESTMODE
78*4882a593Smuzhiyun dev->test.mtd_name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
79*4882a593Smuzhiyun dev->test.mtd_offset = offset;
80*4882a593Smuzhiyun #endif
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun out_put_node:
83*4882a593Smuzhiyun of_node_put(np);
84*4882a593Smuzhiyun return ret;
85*4882a593Smuzhiyun #else
86*4882a593Smuzhiyun return -ENOENT;
87*4882a593Smuzhiyun #endif
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun void
mt76_eeprom_override(struct mt76_dev * dev)91*4882a593Smuzhiyun mt76_eeprom_override(struct mt76_dev *dev)
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun #ifdef CONFIG_OF
94*4882a593Smuzhiyun struct device_node *np = dev->dev->of_node;
95*4882a593Smuzhiyun const u8 *mac = NULL;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (np)
98*4882a593Smuzhiyun mac = of_get_mac_address(np);
99*4882a593Smuzhiyun if (!IS_ERR_OR_NULL(mac))
100*4882a593Smuzhiyun ether_addr_copy(dev->macaddr, mac);
101*4882a593Smuzhiyun #endif
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun if (!is_valid_ether_addr(dev->macaddr)) {
104*4882a593Smuzhiyun eth_random_addr(dev->macaddr);
105*4882a593Smuzhiyun dev_info(dev->dev,
106*4882a593Smuzhiyun "Invalid MAC address, using random address %pM\n",
107*4882a593Smuzhiyun dev->macaddr);
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(mt76_eeprom_override);
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun int
mt76_eeprom_init(struct mt76_dev * dev,int len)113*4882a593Smuzhiyun mt76_eeprom_init(struct mt76_dev *dev, int len)
114*4882a593Smuzhiyun {
115*4882a593Smuzhiyun dev->eeprom.size = len;
116*4882a593Smuzhiyun dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
117*4882a593Smuzhiyun if (!dev->eeprom.data)
118*4882a593Smuzhiyun return -ENOMEM;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun return !mt76_get_of_eeprom(dev, len);
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(mt76_eeprom_init);
123