2 * drivers/net/phy/mdio_bus.c
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
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.
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>
29 #include <linux/module.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/phy.h>
36 #include <asm/uaccess.h>
39 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
40 * @bus: target mii_bus
42 * Description: Called by a bus driver to bring up all the PHYs
43 * on a given bus, and attach them to the bus.
45 * Returns 0 on success or < 0 on error.
47 int mdiobus_register(struct mii_bus *bus)
52 if (NULL == bus || NULL == bus->name ||
57 mutex_init(&bus->mdio_lock);
62 for (i = 0; i < PHY_MAX_ADDR; i++) {
63 bus->phy_map[i] = NULL;
64 if ((bus->phy_mask & (1 << i)) == 0) {
65 struct phy_device *phydev;
67 phydev = mdiobus_scan(bus, i);
69 err = PTR_ERR(phydev);
73 pr_info("%s: probed\n", bus->name);
77 EXPORT_SYMBOL(mdiobus_register);
79 void mdiobus_unregister(struct mii_bus *bus)
83 for (i = 0; i < PHY_MAX_ADDR; i++) {
85 device_unregister(&bus->phy_map[i]->dev);
88 EXPORT_SYMBOL(mdiobus_unregister);
90 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
92 struct phy_device *phydev;
95 phydev = get_phy_device(bus, addr);
96 if (IS_ERR(phydev) || phydev == NULL)
99 /* There's a PHY at this address
106 * And, we need to register it */
108 phydev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
110 phydev->dev.parent = bus->dev;
111 phydev->dev.bus = &mdio_bus_type;
112 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, addr);
116 /* Run all of the fixups for this PHY */
117 phy_scan_fixups(phydev);
119 err = device_register(&phydev->dev);
121 printk(KERN_ERR "phy %d failed to register\n", addr);
122 phy_device_free(phydev);
126 bus->phy_map[addr] = phydev;
130 EXPORT_SYMBOL(mdiobus_scan);
133 * mdio_bus_match - determine if given PHY driver supports the given PHY device
134 * @dev: target PHY device
135 * @drv: given PHY driver
137 * Description: Given a PHY device, and a PHY driver, return 1 if
138 * the driver supports the device. Otherwise, return 0.
140 static int mdio_bus_match(struct device *dev, struct device_driver *drv)
142 struct phy_device *phydev = to_phy_device(dev);
143 struct phy_driver *phydrv = to_phy_driver(drv);
145 return ((phydrv->phy_id & phydrv->phy_id_mask) ==
146 (phydev->phy_id & phydrv->phy_id_mask));
149 /* Suspend and resume. Copied from platform_suspend and
152 static int mdio_bus_suspend(struct device * dev, pm_message_t state)
155 struct device_driver *drv = dev->driver;
157 if (drv && drv->suspend)
158 ret = drv->suspend(dev, state);
163 static int mdio_bus_resume(struct device * dev)
166 struct device_driver *drv = dev->driver;
168 if (drv && drv->resume)
169 ret = drv->resume(dev);
174 struct bus_type mdio_bus_type = {
176 .match = mdio_bus_match,
177 .suspend = mdio_bus_suspend,
178 .resume = mdio_bus_resume,
180 EXPORT_SYMBOL(mdio_bus_type);
182 int __init mdio_bus_init(void)
184 return bus_register(&mdio_bus_type);
187 void mdio_bus_exit(void)
189 bus_unregister(&mdio_bus_type);