blob: bb184717588fe019e7bf039bfb73e651c5960ec6 [file] [log] [blame]
David Daney4b6ba8a2010-10-26 15:07:13 -07001/*
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>
Shawn Guo6ca1a112011-07-04 14:03:17 +080011#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 */
18static const char *phy_modes[] = {
Shawn Guo4157ef12011-07-05 16:42:09 +080019 [PHY_INTERFACE_MODE_NA] = "",
Shawn Guo6ca1a112011-07-04 14:03:17 +080020 [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",
Shawn Guo4157ef12011-07-05 16:42:09 +080030 [PHY_INTERFACE_MODE_SMII] = "smii",
Shawn Guo6ca1a112011-07-04 14:03:17 +080031};
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 */
40const 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}
55EXPORT_SYMBOL_GPL(of_get_phy_mode);
David Daney4b6ba8a2010-10-26 15:07:13 -070056
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*/
75const 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}
93EXPORT_SYMBOL(of_get_mac_address);