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1/*
2 * OF helpers for network devices.
3 *
4 * This file is released under the GPLv2
5 *
6 * Initially copied out of arch/powerpc/kernel/prom_parse.c
7 */
8#include <linux/etherdevice.h>
9#include <linux/kernel.h>
10#include <linux/of_net.h>
11#include <linux/phy.h>
12
13/**
14 * It maps 'enum phy_interface_t' found in include/linux/phy.h
15 * into the device tree binding of 'phy-mode', so that Ethernet
16 * device driver can get phy interface from device tree.
17 */
18static const char *phy_modes[] = {
19 [PHY_INTERFACE_MODE_NA] = "",
20 [PHY_INTERFACE_MODE_MII] = "mii",
21 [PHY_INTERFACE_MODE_GMII] = "gmii",
22 [PHY_INTERFACE_MODE_SGMII] = "sgmii",
23 [PHY_INTERFACE_MODE_TBI] = "tbi",
24 [PHY_INTERFACE_MODE_RMII] = "rmii",
25 [PHY_INTERFACE_MODE_RGMII] = "rgmii",
26 [PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id",
27 [PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid",
28 [PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid",
29 [PHY_INTERFACE_MODE_RTBI] = "rtbi",
30 [PHY_INTERFACE_MODE_SMII] = "smii",
31};
32
33/**
34 * of_get_phy_mode - Get phy mode for given device_node
35 * @np: Pointer to the given device_node
36 *
37 * The function gets phy interface string from property 'phy-mode',
38 * and return its index in phy_modes table, or errno in error case.
39 */
40const int of_get_phy_mode(struct device_node *np)
41{
42 const char *pm;
43 int err, i;
44
45 err = of_property_read_string(np, "phy-mode", &pm);
46 if (err < 0)
47 return err;
48
49 for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
50 if (!strcasecmp(pm, phy_modes[i]))
51 return i;
52
53 return -ENODEV;
54}
55EXPORT_SYMBOL_GPL(of_get_phy_mode);
56
57/**
58 * Search the device tree for the best MAC address to use. 'mac-address' is
59 * checked first, because that is supposed to contain to "most recent" MAC
60 * address. If that isn't set, then 'local-mac-address' is checked next,
61 * because that is the default address. If that isn't set, then the obsolete
62 * 'address' is checked, just in case we're using an old device tree.
63 *
64 * Note that the 'address' property is supposed to contain a virtual address of
65 * the register set, but some DTS files have redefined that property to be the
66 * MAC address.
67 *
68 * All-zero MAC addresses are rejected, because those could be properties that
69 * exist in the device tree, but were not set by U-Boot. For example, the
70 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
71 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
72 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
73 * but is all zeros.
74*/
75const void *of_get_mac_address(struct device_node *np)
76{
77 struct property *pp;
78
79 pp = of_find_property(np, "mac-address", NULL);
80 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
81 return pp->value;
82
83 pp = of_find_property(np, "local-mac-address", NULL);
84 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
85 return pp->value;
86
87 pp = of_find_property(np, "address", NULL);
88 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
89 return pp->value;
90
91 return NULL;
92}
93EXPORT_SYMBOL(of_get_mac_address);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OF helpers for network devices.
4 *
5 * Initially copied out of arch/powerpc/kernel/prom_parse.c
6 */
7#include <linux/etherdevice.h>
8#include <linux/kernel.h>
9#include <linux/of_net.h>
10#include <linux/of_platform.h>
11#include <linux/phy.h>
12#include <linux/export.h>
13#include <linux/device.h>
14
15/**
16 * of_get_phy_mode - Get phy mode for given device_node
17 * @np: Pointer to the given device_node
18 * @interface: Pointer to the result
19 *
20 * The function gets phy interface string from property 'phy-mode' or
21 * 'phy-connection-type'. The index in phy_modes table is set in
22 * interface and 0 returned. In case of error interface is set to
23 * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
24 */
25int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
26{
27 const char *pm;
28 int err, i;
29
30 *interface = PHY_INTERFACE_MODE_NA;
31
32 err = of_property_read_string(np, "phy-mode", &pm);
33 if (err < 0)
34 err = of_property_read_string(np, "phy-connection-type", &pm);
35 if (err < 0)
36 return err;
37
38 for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
39 if (!strcasecmp(pm, phy_modes(i))) {
40 *interface = i;
41 return 0;
42 }
43
44 return -ENODEV;
45}
46EXPORT_SYMBOL_GPL(of_get_phy_mode);
47
48static const void *of_get_mac_addr(struct device_node *np, const char *name)
49{
50 struct property *pp = of_find_property(np, name, NULL);
51
52 if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value))
53 return pp->value;
54 return NULL;
55}
56
57static const void *of_get_mac_addr_nvmem(struct device_node *np)
58{
59 int ret;
60 const void *mac;
61 u8 nvmem_mac[ETH_ALEN];
62 struct platform_device *pdev = of_find_device_by_node(np);
63
64 if (!pdev)
65 return ERR_PTR(-ENODEV);
66
67 ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac);
68 if (ret) {
69 put_device(&pdev->dev);
70 return ERR_PTR(ret);
71 }
72
73 mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL);
74 put_device(&pdev->dev);
75 if (!mac)
76 return ERR_PTR(-ENOMEM);
77
78 return mac;
79}
80
81/**
82 * Search the device tree for the best MAC address to use. 'mac-address' is
83 * checked first, because that is supposed to contain to "most recent" MAC
84 * address. If that isn't set, then 'local-mac-address' is checked next,
85 * because that is the default address. If that isn't set, then the obsolete
86 * 'address' is checked, just in case we're using an old device tree. If any
87 * of the above isn't set, then try to get MAC address from nvmem cell named
88 * 'mac-address'.
89 *
90 * Note that the 'address' property is supposed to contain a virtual address of
91 * the register set, but some DTS files have redefined that property to be the
92 * MAC address.
93 *
94 * All-zero MAC addresses are rejected, because those could be properties that
95 * exist in the device tree, but were not set by U-Boot. For example, the
96 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
97 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
98 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
99 * but is all zeros.
100 *
101 * Return: Will be a valid pointer on success and ERR_PTR in case of error.
102*/
103const void *of_get_mac_address(struct device_node *np)
104{
105 const void *addr;
106
107 addr = of_get_mac_addr(np, "mac-address");
108 if (addr)
109 return addr;
110
111 addr = of_get_mac_addr(np, "local-mac-address");
112 if (addr)
113 return addr;
114
115 addr = of_get_mac_addr(np, "address");
116 if (addr)
117 return addr;
118
119 return of_get_mac_addr_nvmem(np);
120}
121EXPORT_SYMBOL(of_get_mac_address);