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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d01f449c00
Many embedded devices have information such as MAC addresses stored inside NVMEMs like EEPROMs and so on. Currently there are only two drivers in the tree which benefit from NVMEM bindings. Adding support for NVMEM into every other driver would mean adding a lot of repetitive code. This patch allows us to configure MAC addresses in various devices like ethernet and wireless adapters directly from of_get_mac_address, which is already used by almost every driver in the tree. Predecessor of this patch which used directly MTD layer has originated in OpenWrt some time ago and supports already about 497 use cases in 357 device tree files. Cc: Alban Bedel <albeu@free.fr> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: John Crispin <john@phrozen.org> Signed-off-by: Petr Štetiar <ynezz@true.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* OF helpers for network devices.
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*
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* This file is released under the GPLv2
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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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/**
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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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*
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* The function gets phy interface string from property 'phy-mode' or
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* 'phy-connection-type', and return its index in phy_modes table, or errno in
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* error case.
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*/
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int of_get_phy_mode(struct device_node *np)
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{
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const char *pm;
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int err, i;
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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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return i;
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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 const void *of_get_mac_addr(struct device_node *np, const char *name)
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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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return pp->value;
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return NULL;
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}
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static const void *of_get_mac_addr_nvmem(struct device_node *np)
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{
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int ret;
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u8 mac[ETH_ALEN];
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struct property *pp;
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struct platform_device *pdev = of_find_device_by_node(np);
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if (!pdev)
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return ERR_PTR(-ENODEV);
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ret = nvmem_get_mac_address(&pdev->dev, &mac);
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if (ret)
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return ERR_PTR(ret);
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pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
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if (!pp)
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return ERR_PTR(-ENOMEM);
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pp->name = "nvmem-mac-address";
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pp->length = ETH_ALEN;
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pp->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
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if (!pp->value) {
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ret = -ENOMEM;
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goto free;
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}
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ret = of_add_property(np, pp);
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if (ret)
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goto free;
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return pp->value;
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free:
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devm_kfree(&pdev->dev, pp->value);
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devm_kfree(&pdev->dev, pp);
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return ERR_PTR(ret);
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}
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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: Will be a valid pointer on success and ERR_PTR in case of error.
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*/
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const void *of_get_mac_address(struct device_node *np)
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{
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const void *addr;
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addr = of_get_mac_addr(np, "mac-address");
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if (addr)
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return addr;
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addr = of_get_mac_addr(np, "local-mac-address");
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if (addr)
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return addr;
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addr = of_get_mac_addr(np, "address");
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if (addr)
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return addr;
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return of_get_mac_addr_nvmem(np);
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}
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EXPORT_SYMBOL(of_get_mac_address);
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