1 /* Framework for finding and configuring PHYs.
2 * Also contains generic PHY driver
6 * Copyright (c) 2004 Freescale Semiconductor, Inc.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.h>
24 #include <linux/delay.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/skbuff.h>
29 #include <linux/module.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/phy.h>
34 #include <linux/uaccess.h>
38 MODULE_DESCRIPTION("PHY library");
39 MODULE_AUTHOR("Andy Fleming");
40 MODULE_LICENSE("GPL");
42 void phy_device_free(struct phy_device
*phydev
)
44 put_device(&phydev
->dev
);
46 EXPORT_SYMBOL(phy_device_free
);
48 static void phy_device_release(struct device
*dev
)
50 kfree(to_phy_device(dev
));
53 static struct phy_driver genphy_driver
;
55 static LIST_HEAD(phy_fixup_list
);
56 static DEFINE_MUTEX(phy_fixup_lock
);
58 static int phy_attach_direct(struct net_device
*dev
, struct phy_device
*phydev
,
59 u32 flags
, phy_interface_t interface
);
62 * phy_register_fixup - creates a new phy_fixup and adds it to the list
63 * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
64 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
65 * It can also be PHY_ANY_UID
66 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
68 * @run: The actual code to be run when a matching PHY is found
70 int phy_register_fixup(const char *bus_id
, u32 phy_uid
, u32 phy_uid_mask
,
71 int (*run
)(struct phy_device
*))
73 struct phy_fixup
*fixup
= kzalloc(sizeof(*fixup
), GFP_KERNEL
);
78 strlcpy(fixup
->bus_id
, bus_id
, sizeof(fixup
->bus_id
));
79 fixup
->phy_uid
= phy_uid
;
80 fixup
->phy_uid_mask
= phy_uid_mask
;
83 mutex_lock(&phy_fixup_lock
);
84 list_add_tail(&fixup
->list
, &phy_fixup_list
);
85 mutex_unlock(&phy_fixup_lock
);
89 EXPORT_SYMBOL(phy_register_fixup
);
91 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
92 int phy_register_fixup_for_uid(u32 phy_uid
, u32 phy_uid_mask
,
93 int (*run
)(struct phy_device
*))
95 return phy_register_fixup(PHY_ANY_ID
, phy_uid
, phy_uid_mask
, run
);
97 EXPORT_SYMBOL(phy_register_fixup_for_uid
);
99 /* Registers a fixup to be run on the PHY with id string bus_id */
100 int phy_register_fixup_for_id(const char *bus_id
,
101 int (*run
)(struct phy_device
*))
103 return phy_register_fixup(bus_id
, PHY_ANY_UID
, 0xffffffff, run
);
105 EXPORT_SYMBOL(phy_register_fixup_for_id
);
107 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
108 * Fixups can be set to match any in one or more fields.
110 static int phy_needs_fixup(struct phy_device
*phydev
, struct phy_fixup
*fixup
)
112 if (strcmp(fixup
->bus_id
, dev_name(&phydev
->dev
)) != 0)
113 if (strcmp(fixup
->bus_id
, PHY_ANY_ID
) != 0)
116 if ((fixup
->phy_uid
& fixup
->phy_uid_mask
) !=
117 (phydev
->phy_id
& fixup
->phy_uid_mask
))
118 if (fixup
->phy_uid
!= PHY_ANY_UID
)
124 /* Runs any matching fixups for this phydev */
125 static int phy_scan_fixups(struct phy_device
*phydev
)
127 struct phy_fixup
*fixup
;
129 mutex_lock(&phy_fixup_lock
);
130 list_for_each_entry(fixup
, &phy_fixup_list
, list
) {
131 if (phy_needs_fixup(phydev
, fixup
)) {
132 int err
= fixup
->run(phydev
);
135 mutex_unlock(&phy_fixup_lock
);
140 mutex_unlock(&phy_fixup_lock
);
145 struct phy_device
*phy_device_create(struct mii_bus
*bus
, int addr
, int phy_id
,
147 struct phy_c45_device_ids
*c45_ids
)
149 struct phy_device
*dev
;
151 /* We allocate the device, and initialize the default values */
152 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
154 return (struct phy_device
*)PTR_ERR((void *)-ENOMEM
);
156 dev
->dev
.release
= phy_device_release
;
163 dev
->interface
= PHY_INTERFACE_MODE_GMII
;
165 dev
->autoneg
= AUTONEG_ENABLE
;
167 dev
->is_c45
= is_c45
;
169 dev
->phy_id
= phy_id
;
171 dev
->c45_ids
= *c45_ids
;
173 dev
->dev
.parent
= bus
->parent
;
174 dev
->dev
.bus
= &mdio_bus_type
;
175 dev
->irq
= bus
->irq
!= NULL
? bus
->irq
[addr
] : PHY_POLL
;
176 dev_set_name(&dev
->dev
, PHY_ID_FMT
, bus
->id
, addr
);
178 dev
->state
= PHY_DOWN
;
180 mutex_init(&dev
->lock
);
181 INIT_DELAYED_WORK(&dev
->state_queue
, phy_state_machine
);
182 INIT_WORK(&dev
->phy_queue
, phy_change
);
184 /* Request the appropriate module unconditionally; don't
185 * bother trying to do so only if it isn't already loaded,
186 * because that gets complicated. A hotplug event would have
187 * done an unconditional modprobe anyway.
188 * We don't do normal hotplug because it won't work for MDIO
189 * -- because it relies on the device staying around for long
190 * enough for the driver to get loaded. With MDIO, the NIC
191 * driver will get bored and give up as soon as it finds that
192 * there's no driver _already_ loaded.
194 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT
, MDIO_ID_ARGS(phy_id
));
196 device_initialize(&dev
->dev
);
200 EXPORT_SYMBOL(phy_device_create
);
203 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
204 * @bus: the target MII bus
205 * @addr: PHY address on the MII bus
206 * @phy_id: where to store the ID retrieved.
207 * @c45_ids: where to store the c45 ID information.
209 * If the PHY devices-in-package appears to be valid, it and the
210 * corresponding identifiers are stored in @c45_ids, zero is stored
211 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
215 static int get_phy_c45_ids(struct mii_bus
*bus
, int addr
, u32
*phy_id
,
216 struct phy_c45_device_ids
*c45_ids
) {
219 const int num_ids
= ARRAY_SIZE(c45_ids
->device_ids
);
221 /* Find first non-zero Devices In package. Device
222 * zero is reserved, so don't probe it.
225 i
< num_ids
&& c45_ids
->devices_in_package
== 0;
227 reg_addr
= MII_ADDR_C45
| i
<< 16 | 6;
228 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
231 c45_ids
->devices_in_package
= (phy_reg
& 0xffff) << 16;
233 reg_addr
= MII_ADDR_C45
| i
<< 16 | 5;
234 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
237 c45_ids
->devices_in_package
|= (phy_reg
& 0xffff);
239 /* If mostly Fs, there is no device there,
240 * let's get out of here.
242 if ((c45_ids
->devices_in_package
& 0x1fffffff) == 0x1fffffff) {
243 *phy_id
= 0xffffffff;
248 /* Now probe Device Identifiers for each device present. */
249 for (i
= 1; i
< num_ids
; i
++) {
250 if (!(c45_ids
->devices_in_package
& (1 << i
)))
253 reg_addr
= MII_ADDR_C45
| i
<< 16 | MII_PHYSID1
;
254 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
257 c45_ids
->device_ids
[i
] = (phy_reg
& 0xffff) << 16;
259 reg_addr
= MII_ADDR_C45
| i
<< 16 | MII_PHYSID2
;
260 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
263 c45_ids
->device_ids
[i
] |= (phy_reg
& 0xffff);
270 * get_phy_id - reads the specified addr for its ID.
271 * @bus: the target MII bus
272 * @addr: PHY address on the MII bus
273 * @phy_id: where to store the ID retrieved.
274 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
275 * @c45_ids: where to store the c45 ID information.
277 * Description: In the case of a 802.3-c22 PHY, reads the ID registers
278 * of the PHY at @addr on the @bus, stores it in @phy_id and returns
281 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
282 * its return value is in turn returned.
285 static int get_phy_id(struct mii_bus
*bus
, int addr
, u32
*phy_id
,
286 bool is_c45
, struct phy_c45_device_ids
*c45_ids
)
291 return get_phy_c45_ids(bus
, addr
, phy_id
, c45_ids
);
293 /* Grab the bits from PHYIR1, and put them in the upper half */
294 phy_reg
= mdiobus_read(bus
, addr
, MII_PHYSID1
);
298 *phy_id
= (phy_reg
& 0xffff) << 16;
300 /* Grab the bits from PHYIR2, and put them in the lower half */
301 phy_reg
= mdiobus_read(bus
, addr
, MII_PHYSID2
);
305 *phy_id
|= (phy_reg
& 0xffff);
311 * get_phy_device - reads the specified PHY device and returns its @phy_device
313 * @bus: the target MII bus
314 * @addr: PHY address on the MII bus
315 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
317 * Description: Reads the ID registers of the PHY at @addr on the
318 * @bus, then allocates and returns the phy_device to represent it.
320 struct phy_device
*get_phy_device(struct mii_bus
*bus
, int addr
, bool is_c45
)
322 struct phy_c45_device_ids c45_ids
= {0};
326 r
= get_phy_id(bus
, addr
, &phy_id
, is_c45
, &c45_ids
);
330 /* If the phy_id is mostly Fs, there is no device there */
331 if ((phy_id
& 0x1fffffff) == 0x1fffffff)
334 return phy_device_create(bus
, addr
, phy_id
, is_c45
, &c45_ids
);
336 EXPORT_SYMBOL(get_phy_device
);
339 * phy_device_register - Register the phy device on the MDIO bus
340 * @phydev: phy_device structure to be added to the MDIO bus
342 int phy_device_register(struct phy_device
*phydev
)
346 /* Don't register a phy if one is already registered at this address */
347 if (phydev
->bus
->phy_map
[phydev
->addr
])
349 phydev
->bus
->phy_map
[phydev
->addr
] = phydev
;
351 /* Run all of the fixups for this PHY */
352 err
= phy_init_hw(phydev
);
354 pr_err("PHY %d failed to initialize\n", phydev
->addr
);
358 err
= device_add(&phydev
->dev
);
360 pr_err("PHY %d failed to add\n", phydev
->addr
);
367 phydev
->bus
->phy_map
[phydev
->addr
] = NULL
;
370 EXPORT_SYMBOL(phy_device_register
);
373 * phy_find_first - finds the first PHY device on the bus
374 * @bus: the target MII bus
376 struct phy_device
*phy_find_first(struct mii_bus
*bus
)
380 for (addr
= 0; addr
< PHY_MAX_ADDR
; addr
++) {
381 if (bus
->phy_map
[addr
])
382 return bus
->phy_map
[addr
];
386 EXPORT_SYMBOL(phy_find_first
);
389 * phy_prepare_link - prepares the PHY layer to monitor link status
390 * @phydev: target phy_device struct
391 * @handler: callback function for link status change notifications
393 * Description: Tells the PHY infrastructure to handle the
394 * gory details on monitoring link status (whether through
395 * polling or an interrupt), and to call back to the
396 * connected device driver when the link status changes.
397 * If you want to monitor your own link state, don't call
400 static void phy_prepare_link(struct phy_device
*phydev
,
401 void (*handler
)(struct net_device
*))
403 phydev
->adjust_link
= handler
;
407 * phy_connect_direct - connect an ethernet device to a specific phy_device
408 * @dev: the network device to connect
409 * @phydev: the pointer to the phy device
410 * @handler: callback function for state change notifications
411 * @interface: PHY device's interface
413 int phy_connect_direct(struct net_device
*dev
, struct phy_device
*phydev
,
414 void (*handler
)(struct net_device
*),
415 phy_interface_t interface
)
419 rc
= phy_attach_direct(dev
, phydev
, phydev
->dev_flags
, interface
);
423 phy_prepare_link(phydev
, handler
);
424 phy_start_machine(phydev
);
426 phy_start_interrupts(phydev
);
430 EXPORT_SYMBOL(phy_connect_direct
);
433 * phy_connect - connect an ethernet device to a PHY device
434 * @dev: the network device to connect
435 * @bus_id: the id string of the PHY device to connect
436 * @handler: callback function for state change notifications
437 * @interface: PHY device's interface
439 * Description: Convenience function for connecting ethernet
440 * devices to PHY devices. The default behavior is for
441 * the PHY infrastructure to handle everything, and only notify
442 * the connected driver when the link status changes. If you
443 * don't want, or can't use the provided functionality, you may
444 * choose to call only the subset of functions which provide
445 * the desired functionality.
447 struct phy_device
*phy_connect(struct net_device
*dev
, const char *bus_id
,
448 void (*handler
)(struct net_device
*),
449 phy_interface_t interface
)
451 struct phy_device
*phydev
;
455 /* Search the list of PHY devices on the mdio bus for the
456 * PHY with the requested name
458 d
= bus_find_device_by_name(&mdio_bus_type
, NULL
, bus_id
);
460 pr_err("PHY %s not found\n", bus_id
);
461 return ERR_PTR(-ENODEV
);
463 phydev
= to_phy_device(d
);
465 rc
= phy_connect_direct(dev
, phydev
, handler
, interface
);
471 EXPORT_SYMBOL(phy_connect
);
474 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
476 * @phydev: target phy_device struct
478 void phy_disconnect(struct phy_device
*phydev
)
481 phy_stop_interrupts(phydev
);
483 phy_stop_machine(phydev
);
485 phydev
->adjust_link
= NULL
;
489 EXPORT_SYMBOL(phy_disconnect
);
492 * phy_poll_reset - Safely wait until a PHY reset has properly completed
493 * @phydev: The PHY device to poll
495 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
496 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
497 * register must be polled until the BMCR_RESET bit clears.
499 * Furthermore, any attempts to write to PHY registers may have no effect
500 * or even generate MDIO bus errors until this is complete.
502 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
503 * standard and do not fully reset after the BMCR_RESET bit is set, and may
504 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
505 * effort to support such broken PHYs, this function is separate from the
506 * standard phy_init_hw() which will zero all the other bits in the BMCR
507 * and reapply all driver-specific and board-specific fixups.
509 static int phy_poll_reset(struct phy_device
*phydev
)
511 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
512 unsigned int retries
= 12;
517 ret
= phy_read(phydev
, MII_BMCR
);
520 } while (ret
& BMCR_RESET
&& --retries
);
521 if (ret
& BMCR_RESET
)
524 /* Some chips (smsc911x) may still need up to another 1ms after the
525 * BMCR_RESET bit is cleared before they are usable.
531 int phy_init_hw(struct phy_device
*phydev
)
535 if (!phydev
->drv
|| !phydev
->drv
->config_init
)
538 ret
= phy_write(phydev
, MII_BMCR
, BMCR_RESET
);
542 ret
= phy_poll_reset(phydev
);
546 ret
= phy_scan_fixups(phydev
);
550 return phydev
->drv
->config_init(phydev
);
552 EXPORT_SYMBOL(phy_init_hw
);
555 * phy_attach_direct - attach a network device to a given PHY device pointer
556 * @dev: network device to attach
557 * @phydev: Pointer to phy_device to attach
558 * @flags: PHY device's dev_flags
559 * @interface: PHY device's interface
561 * Description: Called by drivers to attach to a particular PHY
562 * device. The phy_device is found, and properly hooked up
563 * to the phy_driver. If no driver is attached, then the
564 * genphy_driver is used. The phy_device is given a ptr to
565 * the attaching device, and given a callback for link status
566 * change. The phy_device is returned to the attaching driver.
568 static int phy_attach_direct(struct net_device
*dev
, struct phy_device
*phydev
,
569 u32 flags
, phy_interface_t interface
)
571 struct device
*d
= &phydev
->dev
;
574 /* Assume that if there is no driver, that it doesn't
575 * exist, and we should use the genphy driver.
577 if (NULL
== d
->driver
) {
578 if (phydev
->is_c45
) {
579 pr_err("No driver for phy %x\n", phydev
->phy_id
);
583 d
->driver
= &genphy_driver
.driver
;
585 err
= d
->driver
->probe(d
);
587 err
= device_bind_driver(d
);
593 if (phydev
->attached_dev
) {
594 dev_err(&dev
->dev
, "PHY already attached\n");
598 phydev
->attached_dev
= dev
;
599 dev
->phydev
= phydev
;
601 phydev
->dev_flags
= flags
;
603 phydev
->interface
= interface
;
605 phydev
->state
= PHY_READY
;
607 /* Do initial configuration here, now that
608 * we have certain key parameters
609 * (dev_flags and interface)
611 err
= phy_init_hw(phydev
);
621 * phy_attach - attach a network device to a particular PHY device
622 * @dev: network device to attach
623 * @bus_id: Bus ID of PHY device to attach
624 * @interface: PHY device's interface
626 * Description: Same as phy_attach_direct() except that a PHY bus_id
627 * string is passed instead of a pointer to a struct phy_device.
629 struct phy_device
*phy_attach(struct net_device
*dev
, const char *bus_id
,
630 phy_interface_t interface
)
632 struct bus_type
*bus
= &mdio_bus_type
;
633 struct phy_device
*phydev
;
637 /* Search the list of PHY devices on the mdio bus for the
638 * PHY with the requested name
640 d
= bus_find_device_by_name(bus
, NULL
, bus_id
);
642 pr_err("PHY %s not found\n", bus_id
);
643 return ERR_PTR(-ENODEV
);
645 phydev
= to_phy_device(d
);
647 rc
= phy_attach_direct(dev
, phydev
, phydev
->dev_flags
, interface
);
653 EXPORT_SYMBOL(phy_attach
);
656 * phy_detach - detach a PHY device from its network device
657 * @phydev: target phy_device struct
659 void phy_detach(struct phy_device
*phydev
)
661 phydev
->attached_dev
->phydev
= NULL
;
662 phydev
->attached_dev
= NULL
;
665 /* If the device had no specific driver before (i.e. - it
666 * was using the generic driver), we unbind the device
667 * from the generic driver so that there's a chance a
668 * real driver could be loaded
670 if (phydev
->dev
.driver
== &genphy_driver
.driver
)
671 device_release_driver(&phydev
->dev
);
673 EXPORT_SYMBOL(phy_detach
);
675 int phy_suspend(struct phy_device
*phydev
)
677 struct phy_driver
*phydrv
= to_phy_driver(phydev
->dev
.driver
);
678 struct ethtool_wolinfo wol
;
680 /* If the device has WOL enabled, we cannot suspend the PHY */
681 wol
.cmd
= ETHTOOL_GWOL
;
682 phy_ethtool_get_wol(phydev
, &wol
);
687 return phydrv
->suspend(phydev
);
691 int phy_resume(struct phy_device
*phydev
)
693 struct phy_driver
*phydrv
= to_phy_driver(phydev
->dev
.driver
);
696 return phydrv
->resume(phydev
);
700 /* Generic PHY support and helper functions */
703 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
704 * @phydev: target phy_device struct
706 * Description: Writes MII_ADVERTISE with the appropriate values,
707 * after sanitizing the values to make sure we only advertise
708 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
709 * hasn't changed, and > 0 if it has changed.
711 static int genphy_config_advert(struct phy_device
*phydev
)
715 int err
, changed
= 0;
717 /* Only allow advertising what this PHY supports */
718 phydev
->advertising
&= phydev
->supported
;
719 advertise
= phydev
->advertising
;
721 /* Setup standard advertisement */
722 adv
= phy_read(phydev
, MII_ADVERTISE
);
727 adv
&= ~(ADVERTISE_ALL
| ADVERTISE_100BASE4
| ADVERTISE_PAUSE_CAP
|
728 ADVERTISE_PAUSE_ASYM
);
729 adv
|= ethtool_adv_to_mii_adv_t(advertise
);
732 err
= phy_write(phydev
, MII_ADVERTISE
, adv
);
739 /* Configure gigabit if it's supported */
740 if (phydev
->supported
& (SUPPORTED_1000baseT_Half
|
741 SUPPORTED_1000baseT_Full
)) {
742 adv
= phy_read(phydev
, MII_CTRL1000
);
747 adv
&= ~(ADVERTISE_1000FULL
| ADVERTISE_1000HALF
);
748 adv
|= ethtool_adv_to_mii_ctrl1000_t(advertise
);
751 err
= phy_write(phydev
, MII_CTRL1000
, adv
);
763 * genphy_setup_forced - configures/forces speed/duplex from @phydev
764 * @phydev: target phy_device struct
766 * Description: Configures MII_BMCR to force speed/duplex
767 * to the values in phydev. Assumes that the values are valid.
768 * Please see phy_sanitize_settings().
770 int genphy_setup_forced(struct phy_device
*phydev
)
775 phydev
->asym_pause
= 0;
777 if (SPEED_1000
== phydev
->speed
)
778 ctl
|= BMCR_SPEED1000
;
779 else if (SPEED_100
== phydev
->speed
)
780 ctl
|= BMCR_SPEED100
;
782 if (DUPLEX_FULL
== phydev
->duplex
)
783 ctl
|= BMCR_FULLDPLX
;
785 return phy_write(phydev
, MII_BMCR
, ctl
);
787 EXPORT_SYMBOL(genphy_setup_forced
);
790 * genphy_restart_aneg - Enable and Restart Autonegotiation
791 * @phydev: target phy_device struct
793 int genphy_restart_aneg(struct phy_device
*phydev
)
795 int ctl
= phy_read(phydev
, MII_BMCR
);
800 ctl
|= BMCR_ANENABLE
| BMCR_ANRESTART
;
802 /* Don't isolate the PHY if we're negotiating */
803 ctl
&= ~BMCR_ISOLATE
;
805 return phy_write(phydev
, MII_BMCR
, ctl
);
807 EXPORT_SYMBOL(genphy_restart_aneg
);
810 * genphy_config_aneg - restart auto-negotiation or write BMCR
811 * @phydev: target phy_device struct
813 * Description: If auto-negotiation is enabled, we configure the
814 * advertising, and then restart auto-negotiation. If it is not
815 * enabled, then we write the BMCR.
817 int genphy_config_aneg(struct phy_device
*phydev
)
821 if (AUTONEG_ENABLE
!= phydev
->autoneg
)
822 return genphy_setup_forced(phydev
);
824 result
= genphy_config_advert(phydev
);
825 if (result
< 0) /* error */
828 /* Advertisement hasn't changed, but maybe aneg was never on to
829 * begin with? Or maybe phy was isolated?
831 int ctl
= phy_read(phydev
, MII_BMCR
);
836 if (!(ctl
& BMCR_ANENABLE
) || (ctl
& BMCR_ISOLATE
))
837 result
= 1; /* do restart aneg */
840 /* Only restart aneg if we are advertising something different
841 * than we were before.
844 result
= genphy_restart_aneg(phydev
);
848 EXPORT_SYMBOL(genphy_config_aneg
);
851 * genphy_update_link - update link status in @phydev
852 * @phydev: target phy_device struct
854 * Description: Update the value in phydev->link to reflect the
855 * current link value. In order to do this, we need to read
856 * the status register twice, keeping the second value.
858 int genphy_update_link(struct phy_device
*phydev
)
863 status
= phy_read(phydev
, MII_BMSR
);
867 /* Read link and autonegotiation status */
868 status
= phy_read(phydev
, MII_BMSR
);
872 if ((status
& BMSR_LSTATUS
) == 0)
879 EXPORT_SYMBOL(genphy_update_link
);
882 * genphy_read_status - check the link status and update current link state
883 * @phydev: target phy_device struct
885 * Description: Check the link, then figure out the current state
886 * by comparing what we advertise with what the link partner
887 * advertises. Start by checking the gigabit possibilities,
888 * then move on to 10/100.
890 int genphy_read_status(struct phy_device
*phydev
)
897 /* Update the link, but return if there was an error */
898 err
= genphy_update_link(phydev
);
902 phydev
->lp_advertising
= 0;
904 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
905 if (phydev
->supported
& (SUPPORTED_1000baseT_Half
906 | SUPPORTED_1000baseT_Full
)) {
907 lpagb
= phy_read(phydev
, MII_STAT1000
);
911 adv
= phy_read(phydev
, MII_CTRL1000
);
915 phydev
->lp_advertising
=
916 mii_stat1000_to_ethtool_lpa_t(lpagb
);
920 lpa
= phy_read(phydev
, MII_LPA
);
924 phydev
->lp_advertising
|= mii_lpa_to_ethtool_lpa_t(lpa
);
926 adv
= phy_read(phydev
, MII_ADVERTISE
);
932 phydev
->speed
= SPEED_10
;
933 phydev
->duplex
= DUPLEX_HALF
;
935 phydev
->asym_pause
= 0;
937 if (lpagb
& (LPA_1000FULL
| LPA_1000HALF
)) {
938 phydev
->speed
= SPEED_1000
;
940 if (lpagb
& LPA_1000FULL
)
941 phydev
->duplex
= DUPLEX_FULL
;
942 } else if (lpa
& (LPA_100FULL
| LPA_100HALF
)) {
943 phydev
->speed
= SPEED_100
;
945 if (lpa
& LPA_100FULL
)
946 phydev
->duplex
= DUPLEX_FULL
;
948 if (lpa
& LPA_10FULL
)
949 phydev
->duplex
= DUPLEX_FULL
;
951 if (phydev
->duplex
== DUPLEX_FULL
) {
952 phydev
->pause
= lpa
& LPA_PAUSE_CAP
? 1 : 0;
953 phydev
->asym_pause
= lpa
& LPA_PAUSE_ASYM
? 1 : 0;
956 int bmcr
= phy_read(phydev
, MII_BMCR
);
961 if (bmcr
& BMCR_FULLDPLX
)
962 phydev
->duplex
= DUPLEX_FULL
;
964 phydev
->duplex
= DUPLEX_HALF
;
966 if (bmcr
& BMCR_SPEED1000
)
967 phydev
->speed
= SPEED_1000
;
968 else if (bmcr
& BMCR_SPEED100
)
969 phydev
->speed
= SPEED_100
;
971 phydev
->speed
= SPEED_10
;
974 phydev
->asym_pause
= 0;
979 EXPORT_SYMBOL(genphy_read_status
);
981 static int genphy_config_init(struct phy_device
*phydev
)
986 /* For now, I'll claim that the generic driver supports
987 * all possible port types
989 features
= (SUPPORTED_TP
| SUPPORTED_MII
990 | SUPPORTED_AUI
| SUPPORTED_FIBRE
|
993 /* Do we support autonegotiation? */
994 val
= phy_read(phydev
, MII_BMSR
);
998 if (val
& BMSR_ANEGCAPABLE
)
999 features
|= SUPPORTED_Autoneg
;
1001 if (val
& BMSR_100FULL
)
1002 features
|= SUPPORTED_100baseT_Full
;
1003 if (val
& BMSR_100HALF
)
1004 features
|= SUPPORTED_100baseT_Half
;
1005 if (val
& BMSR_10FULL
)
1006 features
|= SUPPORTED_10baseT_Full
;
1007 if (val
& BMSR_10HALF
)
1008 features
|= SUPPORTED_10baseT_Half
;
1010 if (val
& BMSR_ESTATEN
) {
1011 val
= phy_read(phydev
, MII_ESTATUS
);
1015 if (val
& ESTATUS_1000_TFULL
)
1016 features
|= SUPPORTED_1000baseT_Full
;
1017 if (val
& ESTATUS_1000_THALF
)
1018 features
|= SUPPORTED_1000baseT_Half
;
1021 phydev
->supported
= features
;
1022 phydev
->advertising
= features
;
1026 int genphy_suspend(struct phy_device
*phydev
)
1030 mutex_lock(&phydev
->lock
);
1032 value
= phy_read(phydev
, MII_BMCR
);
1033 phy_write(phydev
, MII_BMCR
, value
| BMCR_PDOWN
);
1035 mutex_unlock(&phydev
->lock
);
1039 EXPORT_SYMBOL(genphy_suspend
);
1041 int genphy_resume(struct phy_device
*phydev
)
1045 mutex_lock(&phydev
->lock
);
1047 value
= phy_read(phydev
, MII_BMCR
);
1048 phy_write(phydev
, MII_BMCR
, value
& ~BMCR_PDOWN
);
1050 mutex_unlock(&phydev
->lock
);
1054 EXPORT_SYMBOL(genphy_resume
);
1057 * phy_probe - probe and init a PHY device
1058 * @dev: device to probe and init
1060 * Description: Take care of setting up the phy_device structure,
1061 * set the state to READY (the driver's init function should
1062 * set it to STARTING if needed).
1064 static int phy_probe(struct device
*dev
)
1066 struct phy_device
*phydev
= to_phy_device(dev
);
1067 struct device_driver
*drv
= phydev
->dev
.driver
;
1068 struct phy_driver
*phydrv
= to_phy_driver(drv
);
1071 phydev
->drv
= phydrv
;
1073 /* Disable the interrupt if the PHY doesn't support it
1074 * but the interrupt is still a valid one
1076 if (!(phydrv
->flags
& PHY_HAS_INTERRUPT
) &&
1077 phy_interrupt_is_valid(phydev
))
1078 phydev
->irq
= PHY_POLL
;
1080 if (phydrv
->flags
& PHY_IS_INTERNAL
)
1081 phydev
->is_internal
= true;
1083 mutex_lock(&phydev
->lock
);
1085 /* Start out supporting everything. Eventually,
1086 * a controller will attach, and may modify one
1087 * or both of these values
1089 phydev
->supported
= phydrv
->features
;
1090 phydev
->advertising
= phydrv
->features
;
1092 /* Set the state to READY by default */
1093 phydev
->state
= PHY_READY
;
1095 if (phydev
->drv
->probe
)
1096 err
= phydev
->drv
->probe(phydev
);
1098 mutex_unlock(&phydev
->lock
);
1103 static int phy_remove(struct device
*dev
)
1105 struct phy_device
*phydev
= to_phy_device(dev
);
1107 mutex_lock(&phydev
->lock
);
1108 phydev
->state
= PHY_DOWN
;
1109 mutex_unlock(&phydev
->lock
);
1111 if (phydev
->drv
->remove
)
1112 phydev
->drv
->remove(phydev
);
1119 * phy_driver_register - register a phy_driver with the PHY layer
1120 * @new_driver: new phy_driver to register
1122 int phy_driver_register(struct phy_driver
*new_driver
)
1126 new_driver
->driver
.name
= new_driver
->name
;
1127 new_driver
->driver
.bus
= &mdio_bus_type
;
1128 new_driver
->driver
.probe
= phy_probe
;
1129 new_driver
->driver
.remove
= phy_remove
;
1131 retval
= driver_register(&new_driver
->driver
);
1133 pr_err("%s: Error %d in registering driver\n",
1134 new_driver
->name
, retval
);
1139 pr_debug("%s: Registered new driver\n", new_driver
->name
);
1143 EXPORT_SYMBOL(phy_driver_register
);
1145 int phy_drivers_register(struct phy_driver
*new_driver
, int n
)
1149 for (i
= 0; i
< n
; i
++) {
1150 ret
= phy_driver_register(new_driver
+ i
);
1153 phy_driver_unregister(new_driver
+ i
);
1159 EXPORT_SYMBOL(phy_drivers_register
);
1161 void phy_driver_unregister(struct phy_driver
*drv
)
1163 driver_unregister(&drv
->driver
);
1165 EXPORT_SYMBOL(phy_driver_unregister
);
1167 void phy_drivers_unregister(struct phy_driver
*drv
, int n
)
1171 for (i
= 0; i
< n
; i
++)
1172 phy_driver_unregister(drv
+ i
);
1174 EXPORT_SYMBOL(phy_drivers_unregister
);
1176 static struct phy_driver genphy_driver
= {
1177 .phy_id
= 0xffffffff,
1178 .phy_id_mask
= 0xffffffff,
1179 .name
= "Generic PHY",
1180 .config_init
= genphy_config_init
,
1182 .config_aneg
= genphy_config_aneg
,
1183 .read_status
= genphy_read_status
,
1184 .suspend
= genphy_suspend
,
1185 .resume
= genphy_resume
,
1186 .driver
= { .owner
= THIS_MODULE
, },
1189 static int __init
phy_init(void)
1193 rc
= mdio_bus_init();
1197 rc
= phy_driver_register(&genphy_driver
);
1204 static void __exit
phy_exit(void)
1206 phy_driver_unregister(&genphy_driver
);
1210 subsys_initcall(phy_init
);
1211 module_exit(phy_exit
);