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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/net/phy/mdio_bus.c
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_alloc - allocate a mii_bus structure
41 * Description: called by a bus driver to allocate an mii_bus
42 * structure to fill in.
44 struct mii_bus
*mdiobus_alloc(void)
48 bus
= kzalloc(sizeof(*bus
), GFP_KERNEL
);
50 bus
->state
= MDIOBUS_ALLOCATED
;
54 EXPORT_SYMBOL(mdiobus_alloc
);
57 * mdiobus_release - mii_bus device release callback
58 * @d: the target struct device that contains the mii_bus
60 * Description: called when the last reference to an mii_bus is
61 * dropped, to free the underlying memory.
63 static void mdiobus_release(struct device
*d
)
65 struct mii_bus
*bus
= to_mii_bus(d
);
66 BUG_ON(bus
->state
!= MDIOBUS_RELEASED
);
70 static struct class mdio_bus_class
= {
72 .dev_release
= mdiobus_release
,
76 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
77 * @bus: target mii_bus
79 * Description: Called by a bus driver to bring up all the PHYs
80 * on a given bus, and attach them to the bus.
82 * Returns 0 on success or < 0 on error.
84 int mdiobus_register(struct mii_bus
*bus
)
89 if (NULL
== bus
|| NULL
== bus
->name
||
94 BUG_ON(bus
->state
!= MDIOBUS_ALLOCATED
&&
95 bus
->state
!= MDIOBUS_UNREGISTERED
);
97 bus
->dev
.parent
= bus
->parent
;
98 bus
->dev
.class = &mdio_bus_class
;
99 bus
->dev
.groups
= NULL
;
100 memcpy(bus
->dev
.bus_id
, bus
->id
, MII_BUS_ID_SIZE
);
102 err
= device_register(&bus
->dev
);
104 printk(KERN_ERR
"mii_bus %s failed to register\n", bus
->id
);
108 bus
->state
= MDIOBUS_REGISTERED
;
110 mutex_init(&bus
->mdio_lock
);
115 for (i
= 0; i
< PHY_MAX_ADDR
; i
++) {
116 bus
->phy_map
[i
] = NULL
;
117 if ((bus
->phy_mask
& (1 << i
)) == 0) {
118 struct phy_device
*phydev
;
120 phydev
= mdiobus_scan(bus
, i
);
122 err
= PTR_ERR(phydev
);
126 pr_info("%s: probed\n", bus
->name
);
130 EXPORT_SYMBOL(mdiobus_register
);
132 void mdiobus_unregister(struct mii_bus
*bus
)
136 BUG_ON(bus
->state
!= MDIOBUS_REGISTERED
);
137 bus
->state
= MDIOBUS_UNREGISTERED
;
139 device_del(&bus
->dev
);
140 for (i
= 0; i
< PHY_MAX_ADDR
; i
++) {
142 device_unregister(&bus
->phy_map
[i
]->dev
);
145 EXPORT_SYMBOL(mdiobus_unregister
);
148 * mdiobus_free - free a struct mii_bus
149 * @bus: mii_bus to free
151 * This function releases the reference to the underlying device
152 * object in the mii_bus. If this is the last reference, the mii_bus
155 void mdiobus_free(struct mii_bus
*bus
)
158 * For compatibility with error handling in drivers.
160 if (bus
->state
== MDIOBUS_ALLOCATED
) {
165 BUG_ON(bus
->state
!= MDIOBUS_UNREGISTERED
);
166 bus
->state
= MDIOBUS_RELEASED
;
168 put_device(&bus
->dev
);
170 EXPORT_SYMBOL(mdiobus_free
);
172 struct phy_device
*mdiobus_scan(struct mii_bus
*bus
, int addr
)
174 struct phy_device
*phydev
;
177 phydev
= get_phy_device(bus
, addr
);
178 if (IS_ERR(phydev
) || phydev
== NULL
)
181 /* There's a PHY at this address
188 * And, we need to register it */
190 phydev
->irq
= bus
->irq
!= NULL
? bus
->irq
[addr
] : PHY_POLL
;
192 phydev
->dev
.parent
= bus
->parent
;
193 phydev
->dev
.bus
= &mdio_bus_type
;
194 snprintf(phydev
->dev
.bus_id
, BUS_ID_SIZE
, PHY_ID_FMT
, bus
->id
, addr
);
198 /* Run all of the fixups for this PHY */
199 phy_scan_fixups(phydev
);
201 err
= device_register(&phydev
->dev
);
203 printk(KERN_ERR
"phy %d failed to register\n", addr
);
204 phy_device_free(phydev
);
208 bus
->phy_map
[addr
] = phydev
;
212 EXPORT_SYMBOL(mdiobus_scan
);
215 * mdiobus_read - Convenience function for reading a given MII mgmt register
216 * @bus: the mii_bus struct
217 * @addr: the phy address
218 * @regnum: register number to read
220 * NOTE: MUST NOT be called from interrupt context,
221 * because the bus read/write functions may wait for an interrupt
222 * to conclude the operation.
224 int mdiobus_read(struct mii_bus
*bus
, int addr
, u16 regnum
)
228 BUG_ON(in_interrupt());
230 mutex_lock(&bus
->mdio_lock
);
231 retval
= bus
->read(bus
, addr
, regnum
);
232 mutex_unlock(&bus
->mdio_lock
);
236 EXPORT_SYMBOL(mdiobus_read
);
239 * mdiobus_write - Convenience function for writing a given MII mgmt register
240 * @bus: the mii_bus struct
241 * @addr: the phy address
242 * @regnum: register number to write
243 * @val: value to write to @regnum
245 * NOTE: MUST NOT be called from interrupt context,
246 * because the bus read/write functions may wait for an interrupt
247 * to conclude the operation.
249 int mdiobus_write(struct mii_bus
*bus
, int addr
, u16 regnum
, u16 val
)
253 BUG_ON(in_interrupt());
255 mutex_lock(&bus
->mdio_lock
);
256 err
= bus
->write(bus
, addr
, regnum
, val
);
257 mutex_unlock(&bus
->mdio_lock
);
261 EXPORT_SYMBOL(mdiobus_write
);
264 * mdio_bus_match - determine if given PHY driver supports the given PHY device
265 * @dev: target PHY device
266 * @drv: given PHY driver
268 * Description: Given a PHY device, and a PHY driver, return 1 if
269 * the driver supports the device. Otherwise, return 0.
271 static int mdio_bus_match(struct device
*dev
, struct device_driver
*drv
)
273 struct phy_device
*phydev
= to_phy_device(dev
);
274 struct phy_driver
*phydrv
= to_phy_driver(drv
);
276 return ((phydrv
->phy_id
& phydrv
->phy_id_mask
) ==
277 (phydev
->phy_id
& phydrv
->phy_id_mask
));
280 /* Suspend and resume. Copied from platform_suspend and
283 static int mdio_bus_suspend(struct device
* dev
, pm_message_t state
)
286 struct device_driver
*drv
= dev
->driver
;
288 if (drv
&& drv
->suspend
)
289 ret
= drv
->suspend(dev
, state
);
294 static int mdio_bus_resume(struct device
* dev
)
297 struct device_driver
*drv
= dev
->driver
;
299 if (drv
&& drv
->resume
)
300 ret
= drv
->resume(dev
);
305 struct bus_type mdio_bus_type
= {
307 .match
= mdio_bus_match
,
308 .suspend
= mdio_bus_suspend
,
309 .resume
= mdio_bus_resume
,
311 EXPORT_SYMBOL(mdio_bus_type
);
313 int __init
mdio_bus_init(void)
317 ret
= class_register(&mdio_bus_class
);
319 ret
= bus_register(&mdio_bus_type
);
321 class_unregister(&mdio_bus_class
);
327 void mdio_bus_exit(void)
329 class_unregister(&mdio_bus_class
);
330 bus_unregister(&mdio_bus_type
);