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authorTimur Tabi <timur@freescale.com>2007-02-16 12:01:29 -0600
committerPaul Mackerras <paulus@samba.org>2007-02-17 10:21:25 +1100
commit29cfe6f4fb7d187f65564764a0ecf2caf9d8ed58 (patch)
treeacd07e68e6c426d7fc21606acd27bf21c06df0aa /arch/powerpc
parenta32525449b30dfbae804f6b05cde041f35f5a811 (diff)
[POWERPC] add of_get_mac_address and update fsl_soc.c to use it
Add function of_get_mac_address(), which obtains the best MAC address to use from the device tree by checking various properties in order. The order is: 'mac-address', then 'local-mac-address', then 'address'. It skips properties that contain invalid MAC addresses, which were probably not initialized by U-Boot. Update gfar_of_init() and fs_enet_of_init() in fsl_soc.c to call of_get_mac_address(). Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/prom_parse.c40
-rw-r--r--arch/powerpc/sysdev/fsl_soc.c19
2 files changed, 47 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 12c51e4ad2b..ea6fd552c7e 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -5,6 +5,7 @@
#include <linux/pci_regs.h>
#include <linux/module.h>
#include <linux/ioport.h>
+#include <linux/etherdevice.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
@@ -1003,3 +1004,42 @@ int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq
return res;
}
EXPORT_SYMBOL_GPL(of_irq_map_one);
+
+/**
+ * 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
+ * address. If that isn't set, then 'local-mac-address' is checked next,
+ * because that is the default address. If that isn't set, then the obsolete
+ * 'address' is checked, just in case we're using an old device tree.
+ *
+ * Note that the 'address' property is supposed to contain a virtual address of
+ * the register set, but some DTS files have redefined that property to be the
+ * MAC address.
+ *
+ * All-zero MAC addresses are rejected, because those could be properties that
+ * exist in the device tree, but were not set by U-Boot. For example, the
+ * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
+ * addresses. Some older U-Boots only initialized 'local-mac-address'. In
+ * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
+ * but is all zeros.
+*/
+const void *of_get_mac_address(struct device_node *np)
+{
+ struct property *pp;
+
+ pp = of_find_property(np, "mac-address", NULL);
+ if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+ return pp->value;
+
+ pp = of_find_property(np, "local-mac-address", NULL);
+ if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+ return pp->value;
+
+ pp = of_find_property(np, "address", NULL);
+ if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+ return pp->value;
+
+ return NULL;
+}
+EXPORT_SYMBOL(of_get_mac_address);
+
diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index 34161bc5a02..d20f02927f7 100644
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/arch/powerpc/sysdev/fsl_soc.c
@@ -233,14 +233,7 @@ static int __init gfar_of_init(void)
goto err;
}
- mac_addr = get_property(np, "local-mac-address", NULL);
- if (mac_addr == NULL)
- mac_addr = get_property(np, "mac-address", NULL);
- if (mac_addr == NULL) {
- /* Obsolete */
- mac_addr = get_property(np, "address", NULL);
- }
-
+ mac_addr = of_get_mac_address(np);
if (mac_addr)
memcpy(gfar_data.mac_addr, mac_addr, 6);
@@ -646,8 +639,9 @@ static int __init fs_enet_of_init(void)
goto unreg;
}
- mac_addr = get_property(np, "mac-address", NULL);
- memcpy(fs_enet_data.macaddr, mac_addr, 6);
+ mac_addr = of_get_mac_address(np);
+ if (mac_addr)
+ memcpy(fs_enet_data.macaddr, mac_addr, 6);
ph = get_property(np, "phy-handle", NULL);
phy = of_find_node_by_phandle(*ph);
@@ -931,8 +925,9 @@ static int __init fs_enet_of_init(void)
goto err;
r[0].name = enet_regs;
- mac_addr = (void *)get_property(np, "mac-address", NULL);
- memcpy(fs_enet_data.macaddr, mac_addr, 6);
+ mac_addr = of_get_mac_address(np);
+ if (mac_addr)
+ memcpy(fs_enet_data.macaddr, mac_addr, 6);
ph = (phandle *) get_property(np, "phy-handle", NULL);
if (ph != NULL)