172 lines
4.5 KiB
C
172 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* OF helpers for network devices.
|
|
*
|
|
* Initially copied out of arch/powerpc/kernel/prom_parse.c
|
|
*/
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of_net.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/phy.h>
|
|
#include <linux/export.h>
|
|
#include <linux/device.h>
|
|
#include <linux/nvmem-consumer.h>
|
|
|
|
/**
|
|
* of_get_phy_mode - Get phy mode for given device_node
|
|
* @np: Pointer to the given device_node
|
|
* @interface: Pointer to the result
|
|
*
|
|
* The function gets phy interface string from property 'phy-mode' or
|
|
* 'phy-connection-type'. The index in phy_modes table is set in
|
|
* interface and 0 returned. In case of error interface is set to
|
|
* PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
|
|
*/
|
|
int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
|
|
{
|
|
const char *pm;
|
|
int err, i;
|
|
|
|
*interface = PHY_INTERFACE_MODE_NA;
|
|
|
|
err = of_property_read_string(np, "phy-mode", &pm);
|
|
if (err < 0)
|
|
err = of_property_read_string(np, "phy-connection-type", &pm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
|
|
if (!strcasecmp(pm, phy_modes(i))) {
|
|
*interface = i;
|
|
return 0;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_get_phy_mode);
|
|
|
|
static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
|
|
{
|
|
struct property *pp = of_find_property(np, name, NULL);
|
|
|
|
if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {
|
|
memcpy(addr, pp->value, ETH_ALEN);
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
int of_get_mac_address_nvmem(struct device_node *np, u8 *addr)
|
|
{
|
|
struct platform_device *pdev = of_find_device_by_node(np);
|
|
struct nvmem_cell *cell;
|
|
const void *mac;
|
|
size_t len;
|
|
int ret;
|
|
|
|
/* Try lookup by device first, there might be a nvmem_cell_lookup
|
|
* associated with a given device.
|
|
*/
|
|
if (pdev) {
|
|
ret = nvmem_get_mac_address(&pdev->dev, addr);
|
|
put_device(&pdev->dev);
|
|
return ret;
|
|
}
|
|
|
|
cell = of_nvmem_cell_get(np, "mac-address");
|
|
if (IS_ERR(cell))
|
|
return PTR_ERR(cell);
|
|
|
|
mac = nvmem_cell_read(cell, &len);
|
|
nvmem_cell_put(cell);
|
|
|
|
if (IS_ERR(mac))
|
|
return PTR_ERR(mac);
|
|
|
|
if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
|
|
kfree(mac);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(addr, mac, ETH_ALEN);
|
|
kfree(mac);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_get_mac_address_nvmem);
|
|
|
|
/**
|
|
* of_get_mac_address()
|
|
* @np: Caller's Device Node
|
|
* @addr: Pointer to a six-byte array for the result
|
|
*
|
|
* 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. If any
|
|
* of the above isn't set, then try to get MAC address from nvmem cell named
|
|
* 'mac-address'.
|
|
*
|
|
* 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.
|
|
*
|
|
* Return: 0 on success and errno in case of error.
|
|
*/
|
|
int of_get_mac_address(struct device_node *np, u8 *addr)
|
|
{
|
|
int ret;
|
|
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
ret = of_get_mac_addr(np, "mac-address", addr);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
ret = of_get_mac_addr(np, "local-mac-address", addr);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
ret = of_get_mac_addr(np, "address", addr);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
return of_get_mac_address_nvmem(np, addr);
|
|
}
|
|
EXPORT_SYMBOL(of_get_mac_address);
|
|
|
|
/**
|
|
* of_get_ethdev_address()
|
|
* @np: Caller's Device Node
|
|
* @dev: Pointer to netdevice which address will be updated
|
|
*
|
|
* Search the device tree for the best MAC address to use.
|
|
* If found set @dev->dev_addr to that address.
|
|
*
|
|
* See documentation of of_get_mac_address() for more information on how
|
|
* the best address is determined.
|
|
*
|
|
* Return: 0 on success and errno in case of error.
|
|
*/
|
|
int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
|
|
{
|
|
u8 addr[ETH_ALEN];
|
|
int ret;
|
|
|
|
ret = of_get_mac_address(np, addr);
|
|
if (!ret)
|
|
eth_hw_addr_set(dev, addr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(of_get_ethdev_address);
|