1 /*
2 * drivers/net/phy/mdio_bus.c
3 *
4 * MDIO Bus interface
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 */
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/init.h>
23 #include <linux/delay.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/spinlock.h>
28 #include <linux/mm.h>
29 #include <linux/module.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/phy.h>
33
34 #include <asm/io.h>
35 #include <asm/irq.h>
36 #include <asm/uaccess.h>
37
38 /**
39 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
40 * @bus: target mii_bus
41 *
42 * Description: Called by a bus driver to bring up all the PHYs
43 * on a given bus, and attach them to the bus.
44 *
45 * Returns 0 on success or < 0 on error.
46 */
47 int mdiobus_register(struct mii_bus *bus)
48 {
49 int i;
50 int err = 0;
51
52 if (NULL == bus || NULL == bus->name ||
53 NULL == bus->read ||
54 NULL == bus->write)
55 return -EINVAL;
56
57 mutex_init(&bus->mdio_lock);
58
59 if (bus->reset)
60 bus->reset(bus);
61
62 for (i = 0; i < PHY_MAX_ADDR; i++) {
63 struct phy_device *phydev;
64
65 if (bus->phy_mask & (1 << i)) {
66 bus->phy_map[i] = NULL;
67 continue;
68 }
69
70 phydev = get_phy_device(bus, i);
71
72 if (IS_ERR(phydev))
73 return PTR_ERR(phydev);
74
75 /* There's a PHY at this address
76 * We need to set:
77 * 1) IRQ
78 * 2) bus_id
79 * 3) parent
80 * 4) bus
81 * 5) mii_bus
82 * And, we need to register it */
83 if (phydev) {
84 phydev->irq = bus->irq[i];
85
86 phydev->dev.parent = bus->dev;
87 phydev->dev.bus = &mdio_bus_type;
88 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i);
89
90 phydev->bus = bus;
91
92 err = device_register(&phydev->dev);
93
94 if (err) {
95 printk(KERN_ERR "phy %d failed to register\n",
96 i);
97 phy_device_free(phydev);
98 phydev = NULL;
99 }
100 }
101
102 bus->phy_map[i] = phydev;
103 }
104
105 pr_info("%s: probed\n", bus->name);
106
107 return err;
108 }
109 EXPORT_SYMBOL(mdiobus_register);
110
111 void mdiobus_unregister(struct mii_bus *bus)
112 {
113 int i;
114
115 for (i = 0; i < PHY_MAX_ADDR; i++) {
116 if (bus->phy_map[i])
117 device_unregister(&bus->phy_map[i]->dev);
118 }
119 }
120 EXPORT_SYMBOL(mdiobus_unregister);
121
122 /**
123 * mdio_bus_match - determine if given PHY driver supports the given PHY device
124 * @dev: target PHY device
125 * @drv: given PHY driver
126 *
127 * Description: Given a PHY device, and a PHY driver, return 1 if
128 * the driver supports the device. Otherwise, return 0.
129 */
130 static int mdio_bus_match(struct device *dev, struct device_driver *drv)
131 {
132 struct phy_device *phydev = to_phy_device(dev);
133 struct phy_driver *phydrv = to_phy_driver(drv);
134
135 return ((phydrv->phy_id & phydrv->phy_id_mask) ==
136 (phydev->phy_id & phydrv->phy_id_mask));
137 }
138
139 /* Suspend and resume. Copied from platform_suspend and
140 * platform_resume
141 */
142 static int mdio_bus_suspend(struct device * dev, pm_message_t state)
143 {
144 int ret = 0;
145 struct device_driver *drv = dev->driver;
146
147 if (drv && drv->suspend)
148 ret = drv->suspend(dev, state);
149
150 return ret;
151 }
152
153 static int mdio_bus_resume(struct device * dev)
154 {
155 int ret = 0;
156 struct device_driver *drv = dev->driver;
157
158 if (drv && drv->resume)
159 ret = drv->resume(dev);
160
161 return ret;
162 }
163
164 struct bus_type mdio_bus_type = {
165 .name = "mdio_bus",
166 .match = mdio_bus_match,
167 .suspend = mdio_bus_suspend,
168 .resume = mdio_bus_resume,
169 };
170 EXPORT_SYMBOL(mdio_bus_type);
171
172 int __init mdio_bus_init(void)
173 {
174 return bus_register(&mdio_bus_type);
175 }
176
177 void mdio_bus_exit(void)
178 {
179 bus_unregister(&mdio_bus_type);
180 }
181
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