Thomas Gleixner | 55716d2 | 2019-06-01 10:08:42 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 2 | /* |
| 3 | * OF helpers for network devices. |
| 4 | * |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 5 | * Initially copied out of arch/powerpc/kernel/prom_parse.c |
| 6 | */ |
| 7 | #include <linux/etherdevice.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/of_net.h> |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 10 | #include <linux/of_platform.h> |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 11 | #include <linux/phy.h> |
Paul Gortmaker | 2c8d667 | 2011-07-29 16:05:38 +1000 | [diff] [blame] | 12 | #include <linux/export.h> |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 13 | #include <linux/device.h> |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 14 | |
| 15 | /** |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 16 | * of_get_phy_mode - Get phy mode for given device_node |
| 17 | * @np: Pointer to the given device_node |
Andrew Lunn | 0c65b2b | 2019-11-04 02:40:33 +0100 | [diff] [blame] | 18 | * @interface: Pointer to the result |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 19 | * |
Florian Fainelli | cf4c9eb | 2013-11-15 06:23:32 +0000 | [diff] [blame] | 20 | * The function gets phy interface string from property 'phy-mode' or |
Andrew Lunn | 0c65b2b | 2019-11-04 02:40:33 +0100 | [diff] [blame] | 21 | * 'phy-connection-type'. The index in phy_modes table is set in |
| 22 | * interface and 0 returned. In case of error interface is set to |
| 23 | * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV. |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 24 | */ |
Andrew Lunn | 0c65b2b | 2019-11-04 02:40:33 +0100 | [diff] [blame] | 25 | int of_get_phy_mode(struct device_node *np, phy_interface_t *interface) |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 26 | { |
| 27 | const char *pm; |
| 28 | int err, i; |
| 29 | |
Andrew Lunn | 0c65b2b | 2019-11-04 02:40:33 +0100 | [diff] [blame] | 30 | *interface = PHY_INTERFACE_MODE_NA; |
| 31 | |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 32 | err = of_property_read_string(np, "phy-mode", &pm); |
| 33 | if (err < 0) |
Florian Fainelli | cf4c9eb | 2013-11-15 06:23:32 +0000 | [diff] [blame] | 34 | err = of_property_read_string(np, "phy-connection-type", &pm); |
| 35 | if (err < 0) |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 36 | return err; |
| 37 | |
Florian Fainelli | 8a2fe56 | 2014-02-11 17:27:39 -0800 | [diff] [blame] | 38 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) |
Andrew Lunn | 0c65b2b | 2019-11-04 02:40:33 +0100 | [diff] [blame] | 39 | if (!strcasecmp(pm, phy_modes(i))) { |
| 40 | *interface = i; |
| 41 | return 0; |
| 42 | } |
Shawn Guo | 6ca1a11 | 2011-07-04 14:03:17 +0800 | [diff] [blame] | 43 | |
| 44 | return -ENODEV; |
| 45 | } |
| 46 | EXPORT_SYMBOL_GPL(of_get_phy_mode); |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 47 | |
Sergei Shtylyov | 3eb46a1 | 2015-03-18 22:25:46 +0300 | [diff] [blame] | 48 | static const void *of_get_mac_addr(struct device_node *np, const char *name) |
| 49 | { |
| 50 | struct property *pp = of_find_property(np, name, NULL); |
| 51 | |
| 52 | if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) |
| 53 | return pp->value; |
| 54 | return NULL; |
| 55 | } |
| 56 | |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 57 | static const void *of_get_mac_addr_nvmem(struct device_node *np) |
| 58 | { |
| 59 | int ret; |
Petr Štetiar | 2657498 | 2019-05-10 11:35:14 +0200 | [diff] [blame] | 60 | const void *mac; |
| 61 | u8 nvmem_mac[ETH_ALEN]; |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 62 | struct platform_device *pdev = of_find_device_by_node(np); |
| 63 | |
| 64 | if (!pdev) |
| 65 | return ERR_PTR(-ENODEV); |
| 66 | |
Petr Štetiar | 2657498 | 2019-05-10 11:35:14 +0200 | [diff] [blame] | 67 | ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac); |
Petr Štetiar | 3ee9ae7 | 2019-05-13 11:41:39 +0200 | [diff] [blame] | 68 | if (ret) { |
| 69 | put_device(&pdev->dev); |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 70 | return ERR_PTR(ret); |
Petr Štetiar | 3ee9ae7 | 2019-05-13 11:41:39 +0200 | [diff] [blame] | 71 | } |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 72 | |
Petr Štetiar | 2657498 | 2019-05-10 11:35:14 +0200 | [diff] [blame] | 73 | mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL); |
Petr Štetiar | 3ee9ae7 | 2019-05-13 11:41:39 +0200 | [diff] [blame] | 74 | put_device(&pdev->dev); |
Petr Štetiar | 2657498 | 2019-05-10 11:35:14 +0200 | [diff] [blame] | 75 | if (!mac) |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 76 | return ERR_PTR(-ENOMEM); |
| 77 | |
Petr Štetiar | 2657498 | 2019-05-10 11:35:14 +0200 | [diff] [blame] | 78 | return mac; |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 79 | } |
| 80 | |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 81 | /** |
| 82 | * Search the device tree for the best MAC address to use. 'mac-address' is |
| 83 | * checked first, because that is supposed to contain to "most recent" MAC |
| 84 | * address. If that isn't set, then 'local-mac-address' is checked next, |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 85 | * because that is the default address. If that isn't set, then the obsolete |
| 86 | * 'address' is checked, just in case we're using an old device tree. If any |
| 87 | * of the above isn't set, then try to get MAC address from nvmem cell named |
| 88 | * 'mac-address'. |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 89 | * |
| 90 | * Note that the 'address' property is supposed to contain a virtual address of |
| 91 | * the register set, but some DTS files have redefined that property to be the |
| 92 | * MAC address. |
| 93 | * |
| 94 | * All-zero MAC addresses are rejected, because those could be properties that |
| 95 | * exist in the device tree, but were not set by U-Boot. For example, the |
| 96 | * DTS could define 'mac-address' and 'local-mac-address', with zero MAC |
| 97 | * addresses. Some older U-Boots only initialized 'local-mac-address'. In |
| 98 | * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists |
| 99 | * but is all zeros. |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 100 | * |
| 101 | * Return: Will be a valid pointer on success and ERR_PTR in case of error. |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 102 | */ |
| 103 | const void *of_get_mac_address(struct device_node *np) |
| 104 | { |
Sergei Shtylyov | 3eb46a1 | 2015-03-18 22:25:46 +0300 | [diff] [blame] | 105 | const void *addr; |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 106 | |
Sergei Shtylyov | 3eb46a1 | 2015-03-18 22:25:46 +0300 | [diff] [blame] | 107 | addr = of_get_mac_addr(np, "mac-address"); |
| 108 | if (addr) |
| 109 | return addr; |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 110 | |
Sergei Shtylyov | 3eb46a1 | 2015-03-18 22:25:46 +0300 | [diff] [blame] | 111 | addr = of_get_mac_addr(np, "local-mac-address"); |
| 112 | if (addr) |
| 113 | return addr; |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 114 | |
Petr Štetiar | d01f449 | 2019-05-03 16:27:06 +0200 | [diff] [blame] | 115 | addr = of_get_mac_addr(np, "address"); |
| 116 | if (addr) |
| 117 | return addr; |
| 118 | |
| 119 | return of_get_mac_addr_nvmem(np); |
David Daney | 4b6ba8a | 2010-10-26 15:07:13 -0700 | [diff] [blame] | 120 | } |
| 121 | EXPORT_SYMBOL(of_get_mac_address); |