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Commit | Line | Data |
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4b6ba8aa DD |
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> | |
d01f449c | 11 | #include <linux/of_platform.h> |
6ca1a113 | 12 | #include <linux/phy.h> |
2c8d667a | 13 | #include <linux/export.h> |
d01f449c | 14 | #include <linux/device.h> |
6ca1a113 | 15 | |
6ca1a113 SG |
16 | /** |
17 | * of_get_phy_mode - Get phy mode for given device_node | |
18 | * @np: Pointer to the given device_node | |
19 | * | |
cf4c9eb5 FF |
20 | * The function gets phy interface string from property 'phy-mode' or |
21 | * 'phy-connection-type', and return its index in phy_modes table, or errno in | |
22 | * error case. | |
6ca1a113 | 23 | */ |
7e0bdf15 | 24 | int of_get_phy_mode(struct device_node *np) |
6ca1a113 SG |
25 | { |
26 | const char *pm; | |
27 | int err, i; | |
28 | ||
29 | err = of_property_read_string(np, "phy-mode", &pm); | |
cf4c9eb5 FF |
30 | if (err < 0) |
31 | err = of_property_read_string(np, "phy-connection-type", &pm); | |
6ca1a113 SG |
32 | if (err < 0) |
33 | return err; | |
34 | ||
8a2fe56e FF |
35 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) |
36 | if (!strcasecmp(pm, phy_modes(i))) | |
6ca1a113 SG |
37 | return i; |
38 | ||
39 | return -ENODEV; | |
40 | } | |
41 | EXPORT_SYMBOL_GPL(of_get_phy_mode); | |
4b6ba8aa | 42 | |
3eb46a1d SS |
43 | static const void *of_get_mac_addr(struct device_node *np, const char *name) |
44 | { | |
45 | struct property *pp = of_find_property(np, name, NULL); | |
46 | ||
47 | if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) | |
48 | return pp->value; | |
49 | return NULL; | |
50 | } | |
51 | ||
d01f449c PŠ |
52 | static const void *of_get_mac_addr_nvmem(struct device_node *np) |
53 | { | |
54 | int ret; | |
26574986 PŠ |
55 | const void *mac; |
56 | u8 nvmem_mac[ETH_ALEN]; | |
d01f449c PŠ |
57 | struct platform_device *pdev = of_find_device_by_node(np); |
58 | ||
59 | if (!pdev) | |
60 | return ERR_PTR(-ENODEV); | |
61 | ||
26574986 | 62 | ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac); |
3ee9ae74 PŠ |
63 | if (ret) { |
64 | put_device(&pdev->dev); | |
d01f449c | 65 | return ERR_PTR(ret); |
3ee9ae74 | 66 | } |
d01f449c | 67 | |
26574986 | 68 | mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL); |
3ee9ae74 | 69 | put_device(&pdev->dev); |
26574986 | 70 | if (!mac) |
d01f449c PŠ |
71 | return ERR_PTR(-ENOMEM); |
72 | ||
26574986 | 73 | return mac; |
d01f449c PŠ |
74 | } |
75 | ||
4b6ba8aa DD |
76 | /** |
77 | * Search the device tree for the best MAC address to use. 'mac-address' is | |
78 | * checked first, because that is supposed to contain to "most recent" MAC | |
79 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
d01f449c PŠ |
80 | * because that is the default address. If that isn't set, then the obsolete |
81 | * 'address' is checked, just in case we're using an old device tree. If any | |
82 | * of the above isn't set, then try to get MAC address from nvmem cell named | |
83 | * 'mac-address'. | |
4b6ba8aa DD |
84 | * |
85 | * Note that the 'address' property is supposed to contain a virtual address of | |
86 | * the register set, but some DTS files have redefined that property to be the | |
87 | * MAC address. | |
88 | * | |
89 | * All-zero MAC addresses are rejected, because those could be properties that | |
90 | * exist in the device tree, but were not set by U-Boot. For example, the | |
91 | * DTS could define 'mac-address' and 'local-mac-address', with zero MAC | |
92 | * addresses. Some older U-Boots only initialized 'local-mac-address'. In | |
93 | * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists | |
94 | * but is all zeros. | |
d01f449c PŠ |
95 | * |
96 | * Return: Will be a valid pointer on success and ERR_PTR in case of error. | |
4b6ba8aa DD |
97 | */ |
98 | const void *of_get_mac_address(struct device_node *np) | |
99 | { | |
3eb46a1d | 100 | const void *addr; |
4b6ba8aa | 101 | |
3eb46a1d SS |
102 | addr = of_get_mac_addr(np, "mac-address"); |
103 | if (addr) | |
104 | return addr; | |
4b6ba8aa | 105 | |
3eb46a1d SS |
106 | addr = of_get_mac_addr(np, "local-mac-address"); |
107 | if (addr) | |
108 | return addr; | |
4b6ba8aa | 109 | |
d01f449c PŠ |
110 | addr = of_get_mac_addr(np, "address"); |
111 | if (addr) | |
112 | return addr; | |
113 | ||
114 | return of_get_mac_addr_nvmem(np); | |
4b6ba8aa DD |
115 | } |
116 | EXPORT_SYMBOL(of_get_mac_address); |