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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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