aboutsummaryrefslogtreecommitdiff
path: root/drivers/of/of_mdio.c
blob: 42a6715f8e84287ed2eef40382dc7bc89e181fbf (plain)
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 * OF helpers for the MDIO (Ethernet PHY) API
 *
 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
 *
 * This file is released under the GPLv2
 *
 * This file provides helper functions for extracting PHY device information
 * out of the OpenFirmware device tree and using it to populate an mii_bus.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/err.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/module.h>

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");

/**
 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
 * @mdio: pointer to mii_bus structure
 * @np: pointer to device_node of MDIO bus.
 *
 * This function registers the mii_bus structure and registers a phy_device
 * for each child node of @np.
 */
int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
{
	struct phy_device *phy;
	struct device_node *child;
	int rc, i;

	/* Mask out all PHYs from auto probing.  Instead the PHYs listed in
	 * the device tree are populated after the bus has been registered */
	mdio->phy_mask = ~0;

	/* Clear all the IRQ properties */
	if (mdio->irq)
		for (i=0; i<PHY_MAX_ADDR; i++)
			mdio->irq[i] = PHY_POLL;

	/* Register the MDIO bus */
	rc = mdiobus_register(mdio);
	if (rc)
		return rc;

	/* Loop over the child nodes and register a phy_device for each one */
	for_each_child_of_node(np, child) {
		const __be32 *addr;
		int len;

		/* A PHY must have a reg property in the range [0-31] */
		addr = of_get_property(child, "reg", &len);
		if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
			dev_err(&mdio->dev, "%s has invalid PHY address\n",
				child->full_name);
			continue;
		}

		if (mdio->irq) {
			mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
			if (!mdio->irq[*addr])
				mdio->irq[*addr] = PHY_POLL;
		}

		phy = get_phy_device(mdio, be32_to_cpup(addr));
		if (!phy || IS_ERR(phy)) {
			dev_err(&mdio->dev, "error probing PHY at address %i\n",
				*addr);
			continue;
		}
		phy_scan_fixups(phy);

		/* Associate the OF node with the device structure so it
		 * can be looked up later */
		of_node_get(child);
		phy->dev.of_node = child;

		/* All data is now stored in the phy struct; register it */
		rc = phy_device_register(phy);
		if (rc) {
			phy_device_free(phy);
			of_node_put(child);
			continue;
		}

		dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
			child->name, *addr);
	}

	return 0;
}
EXPORT_SYMBOL(of_mdiobus_register);

/* Helper function for of_phy_find_device */
static int of_phy_match(struct device *dev, void *phy_np)
{
	return dev->of_node == phy_np;
}

/**
 * of_phy_find_device - Give a PHY node, find the phy_device
 * @phy_np: Pointer to the phy's device tree node
 *
 * Returns a pointer to the phy_device.
 */
struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
	struct device *d;
	if (!phy_np)
		return NULL;

	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
	return d ? to_phy_device(d) : NULL;
}
EXPORT_SYMBOL(of_phy_find_device);

/**
 * of_phy_connect - Connect to the phy described in the device tree
 * @dev: pointer to net_device claiming the phy
 * @phy_np: Pointer to device tree node for the PHY
 * @hndlr: Link state callback for the network device
 * @iface: PHY data interface type
 *
 * Returns a pointer to the phy_device if successfull.  NULL otherwise
 */
struct phy_device *of_phy_connect(struct net_device *dev,
				  struct device_node *phy_np,
				  void (*hndlr)(struct net_device *), u32 flags,
				  phy_interface_t iface)
{
	struct phy_device *phy = of_phy_find_device(phy_np);

	if (!phy)
		return NULL;

	return phy_connect_direct(dev, phy, hndlr, flags, iface) ? NULL : phy;
}
EXPORT_SYMBOL(of_phy_connect);

/**
 * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
 * @dev: pointer to net_device claiming the phy
 * @hndlr: Link state callback for the network device
 * @iface: PHY data interface type
 *
 * This function is a temporary stop-gap and will be removed soon.  It is
 * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers.  Do
 * not call this function from new drivers.
 */
struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
					     void (*hndlr)(struct net_device *),
					     phy_interface_t iface)
{
	struct device_node *net_np;
	char bus_id[MII_BUS_ID_SIZE + 3];
	struct phy_device *phy;
	const __be32 *phy_id;
	int sz;

	if (!dev->dev.parent)
		return NULL;

	net_np = dev->dev.parent->of_node;
	if (!net_np)
		return NULL;

	phy_id = of_get_property(net_np, "fixed-link", &sz);
	if (!phy_id || sz < sizeof(*phy_id))
		return NULL;

	sprintf(bus_id, PHY_ID_FMT, "0", be32_to_cpu(phy_id[0]));

	phy = phy_connect(dev, bus_id, hndlr, 0, iface);
	return IS_ERR(phy) ? NULL : phy;
}
EXPORT_SYMBOL(of_phy_connect_fixed_link);