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// SPDX-License-Identifier: ISC
/*
* Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
*/
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/etherdevice.h>
#include "mt76.h"
static int
mt76_get_of_eeprom(struct mt76_dev *dev, int len)
{
#if defined(CONFIG_OF) && defined(CONFIG_MTD)
struct device_node *np = dev->dev->of_node;
struct mtd_info *mtd;
const __be32 *list;
const char *part;
phandle phandle;
int offset = 0;
int size;
size_t retlen;
int ret;
if (!np)
return -ENOENT;
list = of_get_property(np, "mediatek,mtd-eeprom", &size);
if (!list)
return -ENOENT;
phandle = be32_to_cpup(list++);
if (!phandle)
return -ENOENT;
np = of_find_node_by_phandle(phandle);
if (!np)
return -EINVAL;
part = of_get_property(np, "label", NULL);
if (!part)
part = np->name;
mtd = get_mtd_device_nm(part);
if (IS_ERR(mtd)) {
ret = PTR_ERR(mtd);
goto out_put_node;
}
if (size <= sizeof(*list)) {
ret = -EINVAL;
goto out_put_node;
}
offset = be32_to_cpup(list);
ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
put_mtd_device(mtd);
if (ret)
goto out_put_node;
if (retlen < len) {
ret = -EINVAL;
goto out_put_node;
}
if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
u8 *data = (u8 *)dev->eeprom.data;
int i;
/* convert eeprom data in Little Endian */
for (i = 0; i < round_down(len, 2); i += 2)
put_unaligned_le16(get_unaligned_be16(&data[i]),
&data[i]);
}
out_put_node:
of_node_put(np);
return ret;
#else
return -ENOENT;
#endif
}
void
mt76_eeprom_override(struct mt76_dev *dev)
{
#ifdef CONFIG_OF
struct device_node *np = dev->dev->of_node;
const u8 *mac = NULL;
if (np)
mac = of_get_mac_address(np);
if (!IS_ERR_OR_NULL(mac))
ether_addr_copy(dev->macaddr, mac);
#endif
if (!is_valid_ether_addr(dev->macaddr)) {
eth_random_addr(dev->macaddr);
dev_info(dev->dev,
"Invalid MAC address, using random address %pM\n",
dev->macaddr);
}
}
EXPORT_SYMBOL_GPL(mt76_eeprom_override);
int
mt76_eeprom_init(struct mt76_dev *dev, int len)
{
dev->eeprom.size = len;
dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
if (!dev->eeprom.data)
return -ENOMEM;
return !mt76_get_of_eeprom(dev, len);
}
EXPORT_SYMBOL_GPL(mt76_eeprom_init);
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