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/device.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/spinlock.h>
30 #include <linux/module.h>
31 #include <linux/mii.h>
32 #include <linux/ethtool.h>
33 #include <linux/phy.h>
37 #include <asm/uaccess.h>
40 * mdiobus_alloc - allocate a mii_bus structure
42 * Description: called by a bus driver to allocate an mii_bus
43 * structure to fill in.
45 struct mii_bus
*mdiobus_alloc(void)
49 bus
= kzalloc(sizeof(*bus
), GFP_KERNEL
);
51 bus
->state
= MDIOBUS_ALLOCATED
;
55 EXPORT_SYMBOL(mdiobus_alloc
);
58 * mdiobus_release - mii_bus device release callback
59 * @d: the target struct device that contains the mii_bus
61 * Description: called when the last reference to an mii_bus is
62 * dropped, to free the underlying memory.
64 static void mdiobus_release(struct device
*d
)
66 struct mii_bus
*bus
= to_mii_bus(d
);
67 BUG_ON(bus
->state
!= MDIOBUS_RELEASED
&&
68 /* for compatibility with error handling in drivers */
69 bus
->state
!= MDIOBUS_ALLOCATED
);
73 static struct class mdio_bus_class
= {
75 .dev_release
= mdiobus_release
,
79 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
80 * @bus: target mii_bus
82 * Description: Called by a bus driver to bring up all the PHYs
83 * on a given bus, and attach them to the bus.
85 * Returns 0 on success or < 0 on error.
87 int mdiobus_register(struct mii_bus
*bus
)
91 if (NULL
== bus
|| NULL
== bus
->name
||
96 BUG_ON(bus
->state
!= MDIOBUS_ALLOCATED
&&
97 bus
->state
!= MDIOBUS_UNREGISTERED
);
99 bus
->dev
.parent
= bus
->parent
;
100 bus
->dev
.class = &mdio_bus_class
;
101 bus
->dev
.groups
= NULL
;
102 dev_set_name(&bus
->dev
, "%s", bus
->id
);
104 err
= device_register(&bus
->dev
);
106 printk(KERN_ERR
"mii_bus %s failed to register\n", bus
->id
);
110 mutex_init(&bus
->mdio_lock
);
115 for (i
= 0; i
< PHY_MAX_ADDR
; i
++) {
116 if ((bus
->phy_mask
& (1 << i
)) == 0) {
117 struct phy_device
*phydev
;
119 phydev
= mdiobus_scan(bus
, i
);
120 if (IS_ERR(phydev
)) {
121 err
= PTR_ERR(phydev
);
127 bus
->state
= MDIOBUS_REGISTERED
;
128 pr_info("%s: probed\n", bus
->name
);
134 device_unregister(&bus
->phy_map
[i
]->dev
);
136 device_del(&bus
->dev
);
139 EXPORT_SYMBOL(mdiobus_register
);
141 void mdiobus_unregister(struct mii_bus
*bus
)
145 BUG_ON(bus
->state
!= MDIOBUS_REGISTERED
);
146 bus
->state
= MDIOBUS_UNREGISTERED
;
148 device_del(&bus
->dev
);
149 for (i
= 0; i
< PHY_MAX_ADDR
; i
++) {
151 device_unregister(&bus
->phy_map
[i
]->dev
);
152 bus
->phy_map
[i
] = NULL
;
155 EXPORT_SYMBOL(mdiobus_unregister
);
158 * mdiobus_free - free a struct mii_bus
159 * @bus: mii_bus to free
161 * This function releases the reference to the underlying device
162 * object in the mii_bus. If this is the last reference, the mii_bus
165 void mdiobus_free(struct mii_bus
*bus
)
168 * For compatibility with error handling in drivers.
170 if (bus
->state
== MDIOBUS_ALLOCATED
) {
175 BUG_ON(bus
->state
!= MDIOBUS_UNREGISTERED
);
176 bus
->state
= MDIOBUS_RELEASED
;
178 put_device(&bus
->dev
);
180 EXPORT_SYMBOL(mdiobus_free
);
182 struct phy_device
*mdiobus_scan(struct mii_bus
*bus
, int addr
)
184 struct phy_device
*phydev
;
187 phydev
= get_phy_device(bus
, addr
);
188 if (IS_ERR(phydev
) || phydev
== NULL
)
191 err
= phy_device_register(phydev
);
193 phy_device_free(phydev
);
199 EXPORT_SYMBOL(mdiobus_scan
);
202 * mdiobus_read - Convenience function for reading a given MII mgmt register
203 * @bus: the mii_bus struct
204 * @addr: the phy address
205 * @regnum: register number to read
207 * NOTE: MUST NOT be called from interrupt context,
208 * because the bus read/write functions may wait for an interrupt
209 * to conclude the operation.
211 int mdiobus_read(struct mii_bus
*bus
, int addr
, u16 regnum
)
215 BUG_ON(in_interrupt());
217 mutex_lock(&bus
->mdio_lock
);
218 retval
= bus
->read(bus
, addr
, regnum
);
219 mutex_unlock(&bus
->mdio_lock
);
223 EXPORT_SYMBOL(mdiobus_read
);
226 * mdiobus_write - Convenience function for writing a given MII mgmt register
227 * @bus: the mii_bus struct
228 * @addr: the phy address
229 * @regnum: register number to write
230 * @val: value to write to @regnum
232 * NOTE: MUST NOT be called from interrupt context,
233 * because the bus read/write functions may wait for an interrupt
234 * to conclude the operation.
236 int mdiobus_write(struct mii_bus
*bus
, int addr
, u16 regnum
, u16 val
)
240 BUG_ON(in_interrupt());
242 mutex_lock(&bus
->mdio_lock
);
243 err
= bus
->write(bus
, addr
, regnum
, val
);
244 mutex_unlock(&bus
->mdio_lock
);
248 EXPORT_SYMBOL(mdiobus_write
);
251 * mdio_bus_match - determine if given PHY driver supports the given PHY device
252 * @dev: target PHY device
253 * @drv: given PHY driver
255 * Description: Given a PHY device, and a PHY driver, return 1 if
256 * the driver supports the device. Otherwise, return 0.
258 static int mdio_bus_match(struct device
*dev
, struct device_driver
*drv
)
260 struct phy_device
*phydev
= to_phy_device(dev
);
261 struct phy_driver
*phydrv
= to_phy_driver(drv
);
263 return ((phydrv
->phy_id
& phydrv
->phy_id_mask
) ==
264 (phydev
->phy_id
& phydrv
->phy_id_mask
));
267 static bool mdio_bus_phy_may_suspend(struct phy_device
*phydev
)
269 struct device_driver
*drv
= phydev
->dev
.driver
;
270 struct phy_driver
*phydrv
= to_phy_driver(drv
);
271 struct net_device
*netdev
= phydev
->attached_dev
;
273 if (!drv
|| !phydrv
->suspend
)
276 /* PHY not attached? May suspend. */
281 * Don't suspend PHY if the attched netdev parent may wakeup.
282 * The parent may point to a PCI device, as in tg3 driver.
284 if (netdev
->dev
.parent
&& device_may_wakeup(netdev
->dev
.parent
))
288 * Also don't suspend PHY if the netdev itself may wakeup. This
289 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
292 if (device_may_wakeup(&netdev
->dev
))
298 /* Suspend and resume. Copied from platform_suspend and
301 static int mdio_bus_suspend(struct device
* dev
, pm_message_t state
)
303 struct phy_driver
*phydrv
= to_phy_driver(dev
->driver
);
304 struct phy_device
*phydev
= to_phy_device(dev
);
306 if (!mdio_bus_phy_may_suspend(phydev
))
308 return phydrv
->suspend(phydev
);
311 static int mdio_bus_resume(struct device
* dev
)
313 struct phy_driver
*phydrv
= to_phy_driver(dev
->driver
);
314 struct phy_device
*phydev
= to_phy_device(dev
);
316 if (!mdio_bus_phy_may_suspend(phydev
))
318 return phydrv
->resume(phydev
);
321 struct bus_type mdio_bus_type
= {
323 .match
= mdio_bus_match
,
324 .suspend
= mdio_bus_suspend
,
325 .resume
= mdio_bus_resume
,
327 EXPORT_SYMBOL(mdio_bus_type
);
329 int __init
mdio_bus_init(void)
333 ret
= class_register(&mdio_bus_class
);
335 ret
= bus_register(&mdio_bus_type
);
337 class_unregister(&mdio_bus_class
);
343 void mdio_bus_exit(void)
345 class_unregister(&mdio_bus_class
);
346 bus_unregister(&mdio_bus_type
);