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