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129 lines
3.4 KiB
Diff
129 lines
3.4 KiB
Diff
From: John Crispin <blogic@openwrt.org>
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Date: Sun, 27 Jul 2014 09:40:01 +0100
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Subject: NET: add mtd-mac-address support to of_get_mac_address()
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Many embedded devices have information such as mac addresses stored inside mtd
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devices. This patch allows us to add a property inside a node describing a
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network interface. The new property points at a mtd partition with an offset
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where the mac address can be found.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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drivers/of/of_net.c | 37 +++++++++++++++++++++++++++++++++++++
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include/linux/of_net.h | 1 +
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2 files changed, 38 insertions(+)
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--- a/drivers/of/of_net.c
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+++ b/drivers/of/of_net.c
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@@ -10,6 +10,7 @@
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#include <linux/of_net.h>
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#include <linux/phy.h>
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#include <linux/export.h>
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+#include <linux/mtd/mtd.h>
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/**
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* of_get_phy_mode - Get phy mode for given device_node
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@@ -38,7 +39,7 @@ int of_get_phy_mode(struct device_node *
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}
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EXPORT_SYMBOL_GPL(of_get_phy_mode);
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-static const void *of_get_mac_addr(struct device_node *np, const char *name)
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+static void *of_get_mac_addr(struct device_node *np, const char *name)
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{
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struct property *pp = of_find_property(np, name, NULL);
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@@ -47,6 +48,73 @@ static const void *of_get_mac_addr(struc
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return NULL;
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}
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+static const void *of_get_mac_address_mtd(struct device_node *np)
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+{
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+#ifdef CONFIG_MTD
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+ struct device_node *mtd_np = NULL;
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+ struct property *prop;
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+ size_t retlen;
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+ int size, ret;
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+ struct mtd_info *mtd;
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+ const char *part;
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+ const __be32 *list;
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+ phandle phandle;
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+ u32 mac_inc = 0;
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+ u8 mac[ETH_ALEN];
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+ void *addr;
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+
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+ list = of_get_property(np, "mtd-mac-address", &size);
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+ if (!list || (size != (2 * sizeof(*list))))
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+ return NULL;
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+
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+ phandle = be32_to_cpup(list++);
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+ if (phandle)
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+ mtd_np = of_find_node_by_phandle(phandle);
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+
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+ if (!mtd_np)
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+ return NULL;
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+
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+ part = of_get_property(mtd_np, "label", NULL);
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+ if (!part)
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+ part = mtd_np->name;
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+
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+ mtd = get_mtd_device_nm(part);
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+ if (IS_ERR(mtd))
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+ return NULL;
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+
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+ ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
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+ put_mtd_device(mtd);
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+
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+ if (!of_property_read_u32(np, "mtd-mac-address-increment", &mac_inc))
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+ mac[5] += mac_inc;
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+
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+ if (!is_valid_ether_addr(mac))
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+ return NULL;
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+
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+ addr = of_get_mac_addr(np, "mac-address");
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+ if (addr) {
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+ memcpy(addr, mac, ETH_ALEN);
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+ return addr;
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+ }
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+
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+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
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+ if (!prop)
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+ return NULL;
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+
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+ prop->name = "mac-address";
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+ prop->length = ETH_ALEN;
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+ prop->value = kmemdup(mac, ETH_ALEN, GFP_KERNEL);
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+ if (!prop->value || of_add_property(np, prop))
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+ goto free;
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+
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+ return prop->value;
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+free:
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+ kfree(prop->value);
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+ kfree(prop);
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+#endif
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+ return NULL;
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+}
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+
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/**
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* Search the device tree for the best MAC address to use. 'mac-address' is
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* checked first, because that is supposed to contain to "most recent" MAC
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@@ -64,11 +132,18 @@ static const void *of_get_mac_addr(struc
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* addresses. Some older U-Boots only initialized 'local-mac-address'. In
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
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* but is all zeros.
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+ *
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+ * If a mtd-mac-address property exists, try to fetch the MAC address from the
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+ * specified mtd device, and store it as a 'mac-address' property
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*/
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const void *of_get_mac_address(struct device_node *np)
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{
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const void *addr;
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+ addr = of_get_mac_address_mtd(np);
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+ if (addr)
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+ return addr;
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+
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addr = of_get_mac_addr(np, "mac-address");
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if (addr)
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return addr;
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