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From f7d3f7790b75b098e1c92530dc3d28ba3b40b5a4 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Sat, 10 Aug 2013 12:48:51 +0200
Subject: [PATCH 28/29] of: add support for parsing mac addresses from mtd
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
drivers/of/of_net.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 99 insertions(+), 1 deletion(-)
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -10,6 +10,7 @@
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/export.h>
+#include <linux/mtd/mtd.h>
/**
* It maps 'enum phy_interface_t' found in include/linux/phy.h
@@ -55,6 +56,103 @@ const int of_get_phy_mode(struct device_
}
EXPORT_SYMBOL_GPL(of_get_phy_mode);
+static const void *of_get_mac_address_mtd(struct device_node *np)
+{
+ const __be32 *list;
+ int size, ret;
+ size_t ret_len;
+ phandle phandle;
+ struct device_node *part_node;
+ struct mtd_info *mtd;
+ const char *part;
+ u8 mac[ETH_ALEN];
+ u64 offset;
+ bool parse_mac = false;
+
+ if (!IS_ENABLED(CONFIG_MTD))
+ return NULL;
+
+ list = of_get_property(np, "mtd-mac-address", &size);
+
+ if (!list) {
+ list = of_get_property(np, "mtd-mac-address-string", &size);
+ parse_mac = true;
+ }
+
+ if (!list)
+ return NULL;
+
+ if (size != sizeof(*list) * 2)
+ return NULL;
+
+ phandle = be32_to_cpup(list++);
+ if (!phandle)
+ return NULL;
+
+ part_node = of_find_node_by_phandle(phandle);
+ if (!part_node)
+ return NULL;
+
+ offset = be32_to_cpup(list++);
+
+ part = of_get_property(part_node, "label", NULL);
+ if (!part)
+ part = part_node->name;
+
+ mtd = get_mtd_device_nm(part);
+
+ of_node_put(part_node);
+
+ if (IS_ERR(mtd))
+ return NULL;
+
+ if (parse_mac) {
+ u8 mac_str[18];
+
+ ret = mtd_read(mtd, offset, 18, &ret_len, (u_char *)&mac_str);
+ if (!ret && ret_len != 18)
+ ret = -EIO;
+
+ if (!ret)
+ ret_len = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ mac, mac + 1, mac + 2, mac + 3,
+ mac + 4, mac + 5);
+
+ } else {
+ ret = mtd_read(mtd, offset, ETH_ALEN, &ret_len, (u_char *)&mac);
+ }
+
+ put_mtd_device(mtd);
+
+ if (!ret && ret_len == ETH_ALEN && is_valid_ether_addr(mac)) {
+ struct property *pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+
+ if (!pp)
+ return NULL;
+
+ pp->name = kstrdup("mac-address", GFP_KERNEL);
+ pp->value = kzalloc(ETH_ALEN, GFP_KERNEL);
+
+ if (!pp->name || !pp->value) {
+ kfree(pp->name);
+ kfree(pp);
+ return NULL;
+ }
+
+ memcpy(pp->value, mac, ETH_ALEN);
+ pp->length = ETH_ALEN;
+
+ if (of_find_property(np, "mac-address", NULL))
+ of_update_property(np, pp);
+ else
+ of_add_property(np, pp);
+
+ return pp->value;
+ }
+
+ return NULL;
+}
+
/**
* Search the device tree for the best MAC address to use. 'mac-address' is
* checked first, because that is supposed to contain to "most recent" MAC
@@ -89,6 +187,6 @@ const void *of_get_mac_address(struct de
if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
return pp->value;
- return NULL;
+ return of_get_mac_address_mtd(np);
}
EXPORT_SYMBOL(of_get_mac_address);
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