mt76: add common code shared between multiple chipsets

This will be used by drivers for MT76x2e, MT7603e and MT7628

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c
new file mode 100644
index 000000000000..530e5593765c
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#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))
+		return PTR_ERR(mtd);
+
+	if (size <= sizeof(*list))
+		return -EINVAL;
+
+	offset = be32_to_cpup(list);
+	ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
+	put_mtd_device(mtd);
+	if (ret)
+		return ret;
+
+	if (retlen < len)
+		return -EINVAL;
+
+	return 0;
+#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;
+
+	if (!np)
+		return;
+
+	mac = of_get_mac_address(np);
+	if (mac)
+		memcpy(dev->macaddr, mac, ETH_ALEN);
+#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);