171 lines
4.5 KiB
C
171 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* OF helpers for network devices.
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*
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* Initially copied out of arch/powerpc/kernel/prom_parse.c
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*/
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#include <linux/etherdevice.h>
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#include <linux/kernel.h>
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#include <linux/of_net.h>
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#include <linux/of_platform.h>
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#include <linux/phy.h>
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#include <linux/export.h>
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#include <linux/device.h>
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#include <linux/nvmem-consumer.h>
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/**
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* of_get_phy_mode - Get phy mode for given device_node
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* @np: Pointer to the given device_node
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* @interface: Pointer to the result
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*
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* The function gets phy interface string from property 'phy-mode' or
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* 'phy-connection-type'. The index in phy_modes table is set in
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* interface and 0 returned. In case of error interface is set to
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* PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
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*/
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int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
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{
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const char *pm;
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int err, i;
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*interface = PHY_INTERFACE_MODE_NA;
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err = of_property_read_string(np, "phy-mode", &pm);
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if (err < 0)
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err = of_property_read_string(np, "phy-connection-type", &pm);
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if (err < 0)
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return err;
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for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
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if (!strcasecmp(pm, phy_modes(i))) {
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*interface = i;
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(of_get_phy_mode);
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static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
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{
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struct property *pp = of_find_property(np, name, NULL);
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if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {
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memcpy(addr, pp->value, ETH_ALEN);
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return 0;
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}
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return -ENODEV;
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}
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static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
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{
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struct platform_device *pdev = of_find_device_by_node(np);
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struct nvmem_cell *cell;
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const void *mac;
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size_t len;
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int ret;
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/* Try lookup by device first, there might be a nvmem_cell_lookup
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* associated with a given device.
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*/
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if (pdev) {
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ret = nvmem_get_mac_address(&pdev->dev, addr);
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put_device(&pdev->dev);
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return ret;
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}
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cell = of_nvmem_cell_get(np, "mac-address");
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if (IS_ERR(cell))
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return PTR_ERR(cell);
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mac = nvmem_cell_read(cell, &len);
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nvmem_cell_put(cell);
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if (IS_ERR(mac))
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return PTR_ERR(mac);
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if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
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kfree(mac);
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return -EINVAL;
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}
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memcpy(addr, mac, ETH_ALEN);
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kfree(mac);
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return 0;
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}
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/**
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* of_get_mac_address()
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* @np: Caller's Device Node
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* @addr: Pointer to a six-byte array for the result
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*
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* Search the device tree for the best MAC address to use. 'mac-address' is
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* checked first, because that is supposed to contain to "most recent" MAC
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* address. If that isn't set, then 'local-mac-address' is checked next,
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* because that is the default address. If that isn't set, then the obsolete
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* 'address' is checked, just in case we're using an old device tree. If any
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* of the above isn't set, then try to get MAC address from nvmem cell named
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* 'mac-address'.
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*
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* Note that the 'address' property is supposed to contain a virtual address of
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* the register set, but some DTS files have redefined that property to be the
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* MAC address.
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*
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* All-zero MAC addresses are rejected, because those could be properties that
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* exist in the device tree, but were not set by U-Boot. For example, the
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* DTS could define 'mac-address' and 'local-mac-address', with zero MAC
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* addresses. Some older U-Boots only initialized 'local-mac-address'. In
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
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* but is all zeros.
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*
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_mac_address(struct device_node *np, u8 *addr)
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{
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int ret;
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if (!np)
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return -ENODEV;
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ret = of_get_mac_addr(np, "mac-address", addr);
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if (!ret)
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return 0;
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ret = of_get_mac_addr(np, "local-mac-address", addr);
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if (!ret)
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return 0;
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ret = of_get_mac_addr(np, "address", addr);
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if (!ret)
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return 0;
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return of_get_mac_addr_nvmem(np, addr);
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}
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EXPORT_SYMBOL(of_get_mac_address);
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/**
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* of_get_ethdev_address()
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* @np: Caller's Device Node
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* @dev: Pointer to netdevice which address will be updated
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*
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* Search the device tree for the best MAC address to use.
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* If found set @dev->dev_addr to that address.
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*
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* See documentation of of_get_mac_address() for more information on how
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* the best address is determined.
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*
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
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{
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u8 addr[ETH_ALEN];
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int ret;
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ret = of_get_mac_address(np, addr);
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if (!ret)
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eth_hw_addr_set(dev, addr);
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return ret;
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}
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EXPORT_SYMBOL(of_get_ethdev_address);
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