diff options
author | David Daney <ddaney@caviumnetworks.com> | 2010-10-26 15:07:13 -0700 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2010-11-01 01:08:14 -0400 |
commit | 4b6ba8aacbb3185703b797286547d0f8f3859b02 (patch) | |
tree | f4e04c3b19d6bf7c7429c0cf678c534838e2990d /drivers/of/of_net.c | |
parent | 3985c7ce85039adacdf882904ca096f091d39346 (diff) | |
download | op-kernel-dev-4b6ba8aacbb3185703b797286547d0f8f3859b02.zip op-kernel-dev-4b6ba8aacbb3185703b797286547d0f8f3859b02.tar.gz |
of/net: Move of_get_mac_address() to a common source file.
There are two identical implementations of of_get_mac_address(), one
each in arch/powerpc/kernel/prom_parse.c and
arch/microblaze/kernel/prom_parse.c. Move this function to a new
common file of_net.{c,h} and adjust all the callers to include the new
header.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
[grant.likely@secretlab.ca: protect header with #ifdef]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of/of_net.c')
-rw-r--r-- | drivers/of/of_net.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c new file mode 100644 index 0000000..86f334a --- /dev/null +++ b/drivers/of/of_net.c @@ -0,0 +1,48 @@ +/* + * OF helpers for network devices. + * + * This file is released under the GPLv2 + * + * Initially copied out of arch/powerpc/kernel/prom_parse.c + */ +#include <linux/etherdevice.h> +#include <linux/kernel.h> +#include <linux/of_net.h> + +/** + * 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); |