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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 | #include <linux/export.h> |
13 | |
14 | /** |
15 | * It maps 'enum phy_interface_t' found in include/linux/phy.h |
16 | * into the device tree binding of 'phy-mode', so that Ethernet |
17 | * device driver can get phy interface from device tree. |
18 | */ |
19 | static const char *phy_modes[] = { |
20 | [PHY_INTERFACE_MODE_NA] = "", |
21 | [PHY_INTERFACE_MODE_MII] = "mii", |
22 | [PHY_INTERFACE_MODE_GMII] = "gmii", |
23 | [PHY_INTERFACE_MODE_SGMII] = "sgmii", |
24 | [PHY_INTERFACE_MODE_TBI] = "tbi", |
25 | [PHY_INTERFACE_MODE_RMII] = "rmii", |
26 | [PHY_INTERFACE_MODE_RGMII] = "rgmii", |
27 | [PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id", |
28 | [PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid", |
29 | [PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid", |
30 | [PHY_INTERFACE_MODE_RTBI] = "rtbi", |
31 | [PHY_INTERFACE_MODE_SMII] = "smii", |
32 | }; |
33 | |
34 | /** |
35 | * of_get_phy_mode - Get phy mode for given device_node |
36 | * @np: Pointer to the given device_node |
37 | * |
38 | * The function gets phy interface string from property 'phy-mode', |
39 | * and return its index in phy_modes table, or errno in error case. |
40 | */ |
41 | const int of_get_phy_mode(struct device_node *np) |
42 | { |
43 | const char *pm; |
44 | int err, i; |
45 | |
46 | err = of_property_read_string(np, "phy-mode", &pm); |
47 | if (err < 0) |
48 | return err; |
49 | |
50 | for (i = 0; i < ARRAY_SIZE(phy_modes); i++) |
51 | if (!strcasecmp(pm, phy_modes[i])) |
52 | return i; |
53 | |
54 | return -ENODEV; |
55 | } |
56 | EXPORT_SYMBOL_GPL(of_get_phy_mode); |
57 | |
58 | /** |
59 | * Search the device tree for the best MAC address to use. 'mac-address' is |
60 | * checked first, because that is supposed to contain to "most recent" MAC |
61 | * address. If that isn't set, then 'local-mac-address' is checked next, |
62 | * because that is the default address. If that isn't set, then the obsolete |
63 | * 'address' is checked, just in case we're using an old device tree. |
64 | * |
65 | * Note that the 'address' property is supposed to contain a virtual address of |
66 | * the register set, but some DTS files have redefined that property to be the |
67 | * MAC address. |
68 | * |
69 | * All-zero MAC addresses are rejected, because those could be properties that |
70 | * exist in the device tree, but were not set by U-Boot. For example, the |
71 | * DTS could define 'mac-address' and 'local-mac-address', with zero MAC |
72 | * addresses. Some older U-Boots only initialized 'local-mac-address'. In |
73 | * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists |
74 | * but is all zeros. |
75 | */ |
76 | const void *of_get_mac_address(struct device_node *np) |
77 | { |
78 | struct property *pp; |
79 | |
80 | pp = of_find_property(np, "mac-address", NULL); |
81 | if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) |
82 | return pp->value; |
83 | |
84 | pp = of_find_property(np, "local-mac-address", NULL); |
85 | if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) |
86 | return pp->value; |
87 | |
88 | pp = of_find_property(np, "address", NULL); |
89 | if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) |
90 | return pp->value; |
91 | |
92 | return NULL; |
93 | } |
94 | EXPORT_SYMBOL(of_get_mac_address); |
95 |
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