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![Miquel Raynal](/assets/img/avatar_default.png)
Export of_get_mac_addr_nvmem() and rename it to of_get_mac_address_nvmem() in order to fit the convention followed by the existing exported helpers of the same kind. This way, OF compatible drivers using eg. fwnode_get_mac_address() can do a direct call to it instead of calling of_get_mac_address() just for the nvmem step, avoiding to repeat an expensive DT lookup which has already been done once. Eventually, fwnode_get_mac_address() should probably be updated to perform the nvmem lookup directly, but as of today, nvmem cells seem not to be supported by ACPI yet which would defeat this kind of extension. Suggested-by: Marcin Wojtas <mw@semihalf.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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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int of_get_mac_address_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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EXPORT_SYMBOL(of_get_mac_address_nvmem);
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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_address_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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