mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 03:33:59 +08:00
4b6ba8aacb
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>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/*
|
|
* 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);
|