tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * OF helpers for the MDIO (Ethernet PHY) API
3 *
4 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
5 *
6 * This file is released under the GPLv2
7 *
8 * This file provides helper functions for extracting PHY device information
9 * out of the OpenFirmware device tree and using it to populate an mii_bus.
10 */
11
12#include <linux/kernel.h>
13#include <linux/device.h>
14#include <linux/netdevice.h>
15#include <linux/err.h>
16#include <linux/phy.h>
17#include <linux/of.h>
18#include <linux/of_mdio.h>
19#include <linux/module.h>
20
21MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
22MODULE_LICENSE("GPL");
23
24/**
25 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
26 * @mdio: pointer to mii_bus structure
27 * @np: pointer to device_node of MDIO bus.
28 *
29 * This function registers the mii_bus structure and registers a phy_device
30 * for each child node of @np.
31 */
32int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
33{
34 struct phy_device *phy;
35 struct device_node *child;
36 int rc, i;
37
38 /* Mask out all PHYs from auto probing. Instead the PHYs listed in
39 * the device tree are populated after the bus has been registered */
40 mdio->phy_mask = ~0;
41
42 /* Clear all the IRQ properties */
43 if (mdio->irq)
44 for (i=0; i<PHY_MAX_ADDR; i++)
45 mdio->irq[i] = PHY_POLL;
46
47 /* Register the MDIO bus */
48 rc = mdiobus_register(mdio);
49 if (rc)
50 return rc;
51
52 /* Loop over the child nodes and register a phy_device for each one */
53 for_each_child_of_node(np, child) {
54 const u32 *addr;
55 int len;
56
57 /* A PHY must have a reg property in the range [0-31] */
58 addr = of_get_property(child, "reg", &len);
59 if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
60 dev_err(&mdio->dev, "%s has invalid PHY address\n",
61 child->full_name);
62 continue;
63 }
64
65 if (mdio->irq) {
66 mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
67 if (!mdio->irq[*addr])
68 mdio->irq[*addr] = PHY_POLL;
69 }
70
71 phy = get_phy_device(mdio, *addr);
72 if (!phy) {
73 dev_err(&mdio->dev, "error probing PHY at address %i\n",
74 *addr);
75 continue;
76 }
77 phy_scan_fixups(phy);
78
79 /* Associate the OF node with the device structure so it
80 * can be looked up later */
81 of_node_get(child);
82 dev_archdata_set_node(&phy->dev.archdata, child);
83
84 /* All data is now stored in the phy struct; register it */
85 rc = phy_device_register(phy);
86 if (rc) {
87 phy_device_free(phy);
88 of_node_put(child);
89 continue;
90 }
91
92 dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
93 child->name, *addr);
94 }
95
96 return 0;
97}
98EXPORT_SYMBOL(of_mdiobus_register);
99
100/* Helper function for of_phy_find_device */
101static int of_phy_match(struct device *dev, void *phy_np)
102{
103 return dev_archdata_get_node(&dev->archdata) == phy_np;
104}
105
106/**
107 * of_phy_find_device - Give a PHY node, find the phy_device
108 * @phy_np: Pointer to the phy's device tree node
109 *
110 * Returns a pointer to the phy_device.
111 */
112struct phy_device *of_phy_find_device(struct device_node *phy_np)
113{
114 struct device *d;
115 if (!phy_np)
116 return NULL;
117
118 d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
119 return d ? to_phy_device(d) : NULL;
120}
121EXPORT_SYMBOL(of_phy_find_device);
122
123/**
124 * of_phy_connect - Connect to the phy described in the device tree
125 * @dev: pointer to net_device claiming the phy
126 * @phy_np: Pointer to device tree node for the PHY
127 * @hndlr: Link state callback for the network device
128 * @iface: PHY data interface type
129 *
130 * Returns a pointer to the phy_device if successfull. NULL otherwise
131 */
132struct phy_device *of_phy_connect(struct net_device *dev,
133 struct device_node *phy_np,
134 void (*hndlr)(struct net_device *), u32 flags,
135 phy_interface_t iface)
136{
137 struct phy_device *phy = of_phy_find_device(phy_np);
138
139 if (!phy)
140 return NULL;
141
142 return phy_connect_direct(dev, phy, hndlr, flags, iface) ? NULL : phy;
143}
144EXPORT_SYMBOL(of_phy_connect);
145
146/**
147 * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
148 * @dev: pointer to net_device claiming the phy
149 * @hndlr: Link state callback for the network device
150 * @iface: PHY data interface type
151 *
152 * This function is a temporary stop-gap and will be removed soon. It is
153 * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do
154 * not call this function from new drivers.
155 */
156struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
157 void (*hndlr)(struct net_device *),
158 phy_interface_t iface)
159{
160 struct device_node *net_np;
161 char bus_id[MII_BUS_ID_SIZE + 3];
162 struct phy_device *phy;
163 const u32 *phy_id;
164 int sz;
165
166 if (!dev->dev.parent)
167 return NULL;
168
169 net_np = dev_archdata_get_node(&dev->dev.parent->archdata);
170 if (!net_np)
171 return NULL;
172
173 phy_id = of_get_property(net_np, "fixed-link", &sz);
174 if (!phy_id || sz < sizeof(*phy_id))
175 return NULL;
176
177 sprintf(bus_id, PHY_ID_FMT, "0", phy_id[0]);
178
179 phy = phy_connect(dev, bus_id, hndlr, 0, iface);
180 return IS_ERR(phy) ? NULL : phy;
181}
182EXPORT_SYMBOL(of_phy_connect_fixed_link);