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> | |
6ca1a113 SG |
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 | */ | |
18 | static const char *phy_modes[] = { | |
4157ef1b | 19 | [PHY_INTERFACE_MODE_NA] = "", |
6ca1a113 SG |
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", | |
4157ef1b | 30 | [PHY_INTERFACE_MODE_SMII] = "smii", |
6ca1a113 SG |
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 | */ | |
40 | const 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 | } | |
55 | EXPORT_SYMBOL_GPL(of_get_phy_mode); | |
4b6ba8aa DD |
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 | */ | |
75 | const 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 | } | |
93 | EXPORT_SYMBOL(of_get_mac_address); |