/*

* OF helpers for network devices.

*

* This file is released under the GPLv2

*

* Initially copied out of arch/powerpc/kernel/prom_parse.c

*/

#include <linux/kernel.h>

#include <linux/of_net.h>

#include <linux/phy.h>

/**

* It maps 'enum phy_interface_t' found in include/linux/phy.h

* into the device tree binding of 'phy-mode', so that Ethernet

* device driver can get phy interface from device tree.

*/

static const char *phy_modes[] = {

[PHY_INTERFACE_MODE_NA] = "",

[PHY_INTERFACE_MODE_MII] = "mii",

[PHY_INTERFACE_MODE_GMII] = "gmii",

[PHY_INTERFACE_MODE_SGMII] = "sgmii",

[PHY_INTERFACE_MODE_TBI] = "tbi",

[PHY_INTERFACE_MODE_REVMII] = "rev-mii",

[PHY_INTERFACE_MODE_RMII] = "rmii",

[PHY_INTERFACE_MODE_RGMII] = "rgmii",

[PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id",

[PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid",

[PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid",

[PHY_INTERFACE_MODE_RTBI] = "rtbi",

[PHY_INTERFACE_MODE_SMII] = "smii",

};

/**

* of_get_phy_mode - Get phy mode for given device_node

* @np: Pointer to the given device_node

*

* The function gets phy interface string from property 'phy-mode',

* and return its index in phy_modes table, or errno in error case.

*/

int of_get_phy_mode(struct device_node *np)

{

const char *pm;

int i;

pm = vmm_devtree_attrval(np, "phy-mode");

if (!pm)

return -ENODEV;

for (i = 0; i < ARRAY_SIZE(phy_modes); i )

if (!strcasecmp(pm, phy_modes[i]))

return i;

return -ENODEV;

}

/**

* 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)

{

const u8 *pp;

u32 length = 0;

length = vmm_devtree_attrlen(np, "mac-address");

pp= vmm_devtree_attrval(np, "mac-address");

if (pp && (length == 6) && is_valid_ether_addr(pp))

return pp;

length = vmm_devtree_attrlen(np, "local-mac-address");

pp= vmm_devtree_attrval(np, "local-mac-address");

if (pp && (length == 6) && is_valid_ether_addr(pp))

return pp;

length = vmm_devtree_attrlen(np, "address");

pp= vmm_devtree_attrval(np, "address");

if (pp && (length == 6) && is_valid_ether_addr(pp))

return pp;

return NULL;

}