// SPDX-License-Identifier: ISC
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/*
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* Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
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*/
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/etherdevice.h>
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#include "mt76.h"
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static int
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mt76_get_of_eeprom(struct mt76_dev *dev, int len)
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{
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#if defined(CONFIG_OF) && defined(CONFIG_MTD)
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struct device_node *np = dev->dev->of_node;
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struct mtd_info *mtd;
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const __be32 *list;
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const char *part;
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phandle phandle;
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int offset = 0;
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int size;
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size_t retlen;
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int ret;
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if (!np)
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return -ENOENT;
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list = of_get_property(np, "mediatek,mtd-eeprom", &size);
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if (!list)
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return -ENOENT;
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phandle = be32_to_cpup(list++);
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if (!phandle)
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return -ENOENT;
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np = of_find_node_by_phandle(phandle);
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if (!np)
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return -EINVAL;
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part = of_get_property(np, "label", NULL);
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if (!part)
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part = np->name;
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mtd = get_mtd_device_nm(part);
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if (IS_ERR(mtd)) {
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ret = PTR_ERR(mtd);
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goto out_put_node;
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}
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if (size <= sizeof(*list)) {
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ret = -EINVAL;
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goto out_put_node;
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}
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offset = be32_to_cpup(list);
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ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
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put_mtd_device(mtd);
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if (ret)
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goto out_put_node;
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if (retlen < len) {
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ret = -EINVAL;
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goto out_put_node;
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}
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if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
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u8 *data = (u8 *)dev->eeprom.data;
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int i;
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/* convert eeprom data in Little Endian */
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for (i = 0; i < round_down(len, 2); i += 2)
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put_unaligned_le16(get_unaligned_be16(&data[i]),
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&data[i]);
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}
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#ifdef CONFIG_NL80211_TESTMODE
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dev->test.mtd_name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
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dev->test.mtd_offset = offset;
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#endif
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out_put_node:
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of_node_put(np);
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return ret;
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#else
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return -ENOENT;
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#endif
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}
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void
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mt76_eeprom_override(struct mt76_dev *dev)
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{
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#ifdef CONFIG_OF
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struct device_node *np = dev->dev->of_node;
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const u8 *mac = NULL;
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if (np)
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mac = of_get_mac_address(np);
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if (!IS_ERR_OR_NULL(mac))
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ether_addr_copy(dev->macaddr, mac);
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#endif
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if (!is_valid_ether_addr(dev->macaddr)) {
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eth_random_addr(dev->macaddr);
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dev_info(dev->dev,
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"Invalid MAC address, using random address %pM\n",
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dev->macaddr);
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}
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}
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EXPORT_SYMBOL_GPL(mt76_eeprom_override);
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int
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mt76_eeprom_init(struct mt76_dev *dev, int len)
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{
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dev->eeprom.size = len;
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dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
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if (!dev->eeprom.data)
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return -ENOMEM;
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return !mt76_get_of_eeprom(dev, len);
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}
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EXPORT_SYMBOL_GPL(mt76_eeprom_init);
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