1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* OF helpers for network devices.
*
* Initially copied out of arch/powerpc/kernel/prom_parse.c
*/
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/of_net.h>
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/export.h>
#include <linux/device.h>
#include <linux/nvmem-consumer.h>
/**
* of_get_phy_mode - Get phy mode for given device_node
* @np: Pointer to the given device_node
* @interface: Pointer to the result
*
* The function gets phy interface string from property 'phy-mode' or
* 'phy-connection-type'. The index in phy_modes table is set in
* interface and 0 returned. In case of error interface is set to
* PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
*/
int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
{
const char *pm;
int err, i;
*interface = PHY_INTERFACE_MODE_NA;
err = of_property_read_string(np, "phy-mode", &pm);
if (err < 0)
err = of_property_read_string(np, "phy-connection-type", &pm);
if (err < 0)
return err;
for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
if (!strcasecmp(pm, phy_modes(i))) {
*interface = i;
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(of_get_phy_mode);
static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
{
struct property *pp = of_find_property(np, name, NULL);
if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {
memcpy(addr, pp->value, ETH_ALEN);
return 0;
}
return -ENODEV;
}
static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
{
struct platform_device *pdev = of_find_device_by_node(np);
struct nvmem_cell *cell;
const void *mac;
size_t len;
int ret;
/* Try lookup by device first, there might be a nvmem_cell_lookup
* associated with a given device.
*/
if (pdev) {
ret = nvmem_get_mac_address(&pdev->dev, addr);
put_device(&pdev->dev);
return ret;
}
cell = of_nvmem_cell_get(np, "mac-address");
if (IS_ERR(cell))
return PTR_ERR(cell);
mac = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (IS_ERR(mac))
return PTR_ERR(mac);
if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
kfree(mac);
return -EINVAL;
}
memcpy(addr, mac, ETH_ALEN);
kfree(mac);
return 0;
}
/**
* of_get_mac_address()
* @np: Caller's Device Node
* @addr: Pointer to a six-byte array for the result
*
* Search the device tree for the best MAC address to use. 'mac-address' is
* checked first, because that is supposed to contain to "most recent" MAC
* address. If that isn't set, then 'local-mac-address' is checked next,
* because that is the default address. If that isn't set, then the obsolete
* 'address' is checked, just in case we're using an old device tree. If any
* of the above isn't set, then try to get MAC address from nvmem cell named
* 'mac-address'.
*
* Note that the 'address' property is supposed to contain a virtual address of
* the register set, but some DTS files have redefined that property to be the
* MAC address.
*
* All-zero MAC addresses are rejected, because those could be properties that
* exist in the device tree, but were not set by U-Boot. For example, the
* DTS could define 'mac-address' and 'local-mac-address', with zero MAC
* addresses. Some older U-Boots only initialized 'local-mac-address'. In
* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
* but is all zeros.
*
* Return: 0 on success and errno in case of error.
*/
int of_get_mac_address(struct device_node *np, u8 *addr)
{
int ret;
if (!np)
return -ENODEV;
ret = of_get_mac_addr(np, "mac-address", addr);
if (!ret)
return 0;
ret = of_get_mac_addr(np, "local-mac-address", addr);
if (!ret)
return 0;
ret = of_get_mac_addr(np, "address", addr);
if (!ret)
return 0;
return of_get_mac_addr_nvmem(np, addr);
}
EXPORT_SYMBOL(of_get_mac_address);
|
