Commit | Line | Data |
---|---|---|
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> | |
9217e566 | 10 | #include <linux/nvmem-consumer.h> |
4b6ba8aa | 11 | #include <linux/of_net.h> |
6ca1a113 | 12 | #include <linux/phy.h> |
2c8d667a | 13 | #include <linux/export.h> |
6ca1a113 | 14 | |
6ca1a113 SG |
15 | /** |
16 | * of_get_phy_mode - Get phy mode for given device_node | |
17 | * @np: Pointer to the given device_node | |
18 | * | |
cf4c9eb5 FF |
19 | * The function gets phy interface string from property 'phy-mode' or |
20 | * 'phy-connection-type', and return its index in phy_modes table, or errno in | |
21 | * error case. | |
6ca1a113 | 22 | */ |
7e0bdf15 | 23 | int of_get_phy_mode(struct device_node *np) |
6ca1a113 SG |
24 | { |
25 | const char *pm; | |
26 | int err, i; | |
27 | ||
28 | err = of_property_read_string(np, "phy-mode", &pm); | |
cf4c9eb5 FF |
29 | if (err < 0) |
30 | err = of_property_read_string(np, "phy-connection-type", &pm); | |
6ca1a113 SG |
31 | if (err < 0) |
32 | return err; | |
33 | ||
8a2fe56e FF |
34 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) |
35 | if (!strcasecmp(pm, phy_modes(i))) | |
6ca1a113 SG |
36 | return i; |
37 | ||
38 | return -ENODEV; | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(of_get_phy_mode); | |
4b6ba8aa | 41 | |
3eb46a1d SS |
42 | static const void *of_get_mac_addr(struct device_node *np, const char *name) |
43 | { | |
44 | struct property *pp = of_find_property(np, name, NULL); | |
45 | ||
46 | if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) | |
47 | return pp->value; | |
48 | return NULL; | |
49 | } | |
50 | ||
4b6ba8aa DD |
51 | /** |
52 | * Search the device tree for the best MAC address to use. 'mac-address' is | |
53 | * checked first, because that is supposed to contain to "most recent" MAC | |
54 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
55 | * because that is the default address. If that isn't set, then the obsolete | |
56 | * 'address' is checked, just in case we're using an old device tree. | |
57 | * | |
58 | * Note that the 'address' property is supposed to contain a virtual address of | |
59 | * the register set, but some DTS files have redefined that property to be the | |
60 | * MAC address. | |
61 | * | |
62 | * All-zero MAC addresses are rejected, because those could be properties that | |
63 | * exist in the device tree, but were not set by U-Boot. For example, the | |
64 | * DTS could define 'mac-address' and 'local-mac-address', with zero MAC | |
65 | * addresses. Some older U-Boots only initialized 'local-mac-address'. In | |
66 | * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists | |
67 | * but is all zeros. | |
68 | */ | |
69 | const void *of_get_mac_address(struct device_node *np) | |
70 | { | |
3eb46a1d | 71 | const void *addr; |
4b6ba8aa | 72 | |
3eb46a1d SS |
73 | addr = of_get_mac_addr(np, "mac-address"); |
74 | if (addr) | |
75 | return addr; | |
4b6ba8aa | 76 | |
3eb46a1d SS |
77 | addr = of_get_mac_addr(np, "local-mac-address"); |
78 | if (addr) | |
79 | return addr; | |
4b6ba8aa | 80 | |
3eb46a1d | 81 | return of_get_mac_addr(np, "address"); |
4b6ba8aa DD |
82 | } |
83 | EXPORT_SYMBOL(of_get_mac_address); | |
9217e566 ML |
84 | |
85 | /** | |
86 | * Obtain the MAC address from an nvmem provider named 'mac-address' through | |
87 | * device tree. | |
88 | * On success, copies the new address into memory pointed to by addr and | |
89 | * returns 0. Returns a negative error code otherwise. | |
90 | * @np: Device tree node containing the nvmem-cells phandle | |
91 | * @addr: Pointer to receive the MAC address using ether_addr_copy() | |
92 | */ | |
93 | int of_get_nvmem_mac_address(struct device_node *np, void *addr) | |
94 | { | |
95 | struct nvmem_cell *cell; | |
96 | const void *mac; | |
97 | size_t len; | |
98 | int ret; | |
99 | ||
100 | cell = of_nvmem_cell_get(np, "mac-address"); | |
101 | if (IS_ERR(cell)) | |
102 | return PTR_ERR(cell); | |
103 | ||
104 | mac = nvmem_cell_read(cell, &len); | |
105 | ||
106 | nvmem_cell_put(cell); | |
107 | ||
108 | if (IS_ERR(mac)) | |
109 | return PTR_ERR(mac); | |
110 | ||
111 | if (len < ETH_ALEN || !is_valid_ether_addr(mac)) { | |
112 | ret = -EINVAL; | |
113 | } else { | |
114 | ether_addr_copy(addr, mac); | |
115 | ret = 0; | |
116 | } | |
117 | ||
118 | kfree(mac); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | EXPORT_SYMBOL(of_get_nvmem_mac_address); |