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
;
75 fixup
= kzalloc(sizeof(*fixup
), GFP_KERNEL
);
79 strlcpy(fixup
->bus_id
, bus_id
, sizeof(fixup
->bus_id
));
80 fixup
->phy_uid
= phy_uid
;
81 fixup
->phy_uid_mask
= phy_uid_mask
;
84 mutex_lock(&phy_fixup_lock
);
85 list_add_tail(&fixup
->list
, &phy_fixup_list
);
86 mutex_unlock(&phy_fixup_lock
);
90 EXPORT_SYMBOL(phy_register_fixup
);
92 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
93 int phy_register_fixup_for_uid(u32 phy_uid
, u32 phy_uid_mask
,
94 int (*run
)(struct phy_device
*))
96 return phy_register_fixup(PHY_ANY_ID
, phy_uid
, phy_uid_mask
, run
);
98 EXPORT_SYMBOL(phy_register_fixup_for_uid
);
100 /* Registers a fixup to be run on the PHY with id string bus_id */
101 int phy_register_fixup_for_id(const char *bus_id
,
102 int (*run
)(struct phy_device
*))
104 return phy_register_fixup(bus_id
, PHY_ANY_UID
, 0xffffffff, run
);
106 EXPORT_SYMBOL(phy_register_fixup_for_id
);
108 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
109 * Fixups can be set to match any in one or more fields.
111 static int phy_needs_fixup(struct phy_device
*phydev
, struct phy_fixup
*fixup
)
113 if (strcmp(fixup
->bus_id
, dev_name(&phydev
->dev
)) != 0)
114 if (strcmp(fixup
->bus_id
, PHY_ANY_ID
) != 0)
117 if ((fixup
->phy_uid
& fixup
->phy_uid_mask
) !=
118 (phydev
->phy_id
& fixup
->phy_uid_mask
))
119 if (fixup
->phy_uid
!= PHY_ANY_UID
)
125 /* Runs any matching fixups for this phydev */
126 int phy_scan_fixups(struct phy_device
*phydev
)
128 struct phy_fixup
*fixup
;
130 mutex_lock(&phy_fixup_lock
);
131 list_for_each_entry(fixup
, &phy_fixup_list
, list
) {
132 if (phy_needs_fixup(phydev
, fixup
)) {
135 err
= fixup
->run(phydev
);
138 mutex_unlock(&phy_fixup_lock
);
143 mutex_unlock(&phy_fixup_lock
);
147 EXPORT_SYMBOL(phy_scan_fixups
);
149 struct phy_device
*phy_device_create(struct mii_bus
*bus
, int addr
, int phy_id
,
151 struct phy_c45_device_ids
*c45_ids
)
153 struct phy_device
*dev
;
155 /* We allocate the device, and initialize the default values */
156 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
159 return (struct phy_device
*)PTR_ERR((void *)-ENOMEM
);
161 dev
->dev
.release
= phy_device_release
;
168 dev
->interface
= PHY_INTERFACE_MODE_GMII
;
170 dev
->autoneg
= AUTONEG_ENABLE
;
172 dev
->is_c45
= is_c45
;
174 dev
->phy_id
= phy_id
;
176 dev
->c45_ids
= *c45_ids
;
178 dev
->dev
.parent
= bus
->parent
;
179 dev
->dev
.bus
= &mdio_bus_type
;
180 dev
->irq
= bus
->irq
!= NULL
? bus
->irq
[addr
] : PHY_POLL
;
181 dev_set_name(&dev
->dev
, PHY_ID_FMT
, bus
->id
, addr
);
183 dev
->state
= PHY_DOWN
;
185 mutex_init(&dev
->lock
);
186 INIT_DELAYED_WORK(&dev
->state_queue
, phy_state_machine
);
187 INIT_WORK(&dev
->phy_queue
, phy_change
);
189 /* Request the appropriate module unconditionally; don't
190 * bother trying to do so only if it isn't already loaded,
191 * because that gets complicated. A hotplug event would have
192 * done an unconditional modprobe anyway.
193 * We don't do normal hotplug because it won't work for MDIO
194 * -- because it relies on the device staying around for long
195 * enough for the driver to get loaded. With MDIO, the NIC
196 * driver will get bored and give up as soon as it finds that
197 * there's no driver _already_ loaded.
199 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT
, MDIO_ID_ARGS(phy_id
));
201 device_initialize(&dev
->dev
);
205 EXPORT_SYMBOL(phy_device_create
);
208 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
209 * @bus: the target MII bus
210 * @addr: PHY address on the MII bus
211 * @phy_id: where to store the ID retrieved.
212 * @c45_ids: where to store the c45 ID information.
214 * If the PHY devices-in-package appears to be valid, it and the
215 * corresponding identifiers are stored in @c45_ids, zero is stored
216 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
220 static int get_phy_c45_ids(struct mii_bus
*bus
, int addr
, u32
*phy_id
,
221 struct phy_c45_device_ids
*c45_ids
) {
224 const int num_ids
= ARRAY_SIZE(c45_ids
->device_ids
);
226 /* Find first non-zero Devices In package. Device
227 * zero is reserved, so don't probe it.
230 i
< num_ids
&& c45_ids
->devices_in_package
== 0;
232 reg_addr
= MII_ADDR_C45
| i
<< 16 | 6;
233 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
236 c45_ids
->devices_in_package
= (phy_reg
& 0xffff) << 16;
238 reg_addr
= MII_ADDR_C45
| i
<< 16 | 5;
239 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
242 c45_ids
->devices_in_package
|= (phy_reg
& 0xffff);
244 /* If mostly Fs, there is no device there,
245 * let's get out of here.
247 if ((c45_ids
->devices_in_package
& 0x1fffffff) == 0x1fffffff) {
248 *phy_id
= 0xffffffff;
253 /* Now probe Device Identifiers for each device present. */
254 for (i
= 1; i
< num_ids
; i
++) {
255 if (!(c45_ids
->devices_in_package
& (1 << i
)))
258 reg_addr
= MII_ADDR_C45
| i
<< 16 | MII_PHYSID1
;
259 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
262 c45_ids
->device_ids
[i
] = (phy_reg
& 0xffff) << 16;
264 reg_addr
= MII_ADDR_C45
| i
<< 16 | MII_PHYSID2
;
265 phy_reg
= mdiobus_read(bus
, addr
, reg_addr
);
268 c45_ids
->device_ids
[i
] |= (phy_reg
& 0xffff);
275 * get_phy_id - reads the specified addr for its ID.
276 * @bus: the target MII bus
277 * @addr: PHY address on the MII bus
278 * @phy_id: where to store the ID retrieved.
279 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
280 * @c45_ids: where to store the c45 ID information.
282 * Description: In the case of a 802.3-c22 PHY, reads the ID registers
283 * of the PHY at @addr on the @bus, stores it in @phy_id and returns
286 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
287 * its return value is in turn returned.
290 static int get_phy_id(struct mii_bus
*bus
, int addr
, u32
*phy_id
,
291 bool is_c45
, struct phy_c45_device_ids
*c45_ids
)
296 return get_phy_c45_ids(bus
, addr
, phy_id
, c45_ids
);
298 /* Grab the bits from PHYIR1, and put them in the upper half */
299 phy_reg
= mdiobus_read(bus
, addr
, MII_PHYSID1
);
304 *phy_id
= (phy_reg
& 0xffff) << 16;
306 /* Grab the bits from PHYIR2, and put them in the lower half */
307 phy_reg
= mdiobus_read(bus
, addr
, MII_PHYSID2
);
312 *phy_id
|= (phy_reg
& 0xffff);
318 * get_phy_device - reads the specified PHY device and returns its @phy_device
320 * @bus: the target MII bus
321 * @addr: PHY address on the MII bus
322 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
324 * Description: Reads the ID registers of the PHY at @addr on the
325 * @bus, then allocates and returns the phy_device to represent it.
327 struct phy_device
*get_phy_device(struct mii_bus
*bus
, int addr
, bool is_c45
)
329 struct phy_c45_device_ids c45_ids
= {0};
330 struct phy_device
*dev
= NULL
;
334 r
= get_phy_id(bus
, addr
, &phy_id
, is_c45
, &c45_ids
);
338 /* If the phy_id is mostly Fs, there is no device there */
339 if ((phy_id
& 0x1fffffff) == 0x1fffffff)
342 dev
= phy_device_create(bus
, addr
, phy_id
, is_c45
, &c45_ids
);
346 EXPORT_SYMBOL(get_phy_device
);
349 * phy_device_register - Register the phy device on the MDIO bus
350 * @phydev: phy_device structure to be added to the MDIO bus
352 int phy_device_register(struct phy_device
*phydev
)
356 /* Don't register a phy if one is already registered at this address */
357 if (phydev
->bus
->phy_map
[phydev
->addr
])
359 phydev
->bus
->phy_map
[phydev
->addr
] = phydev
;
361 /* Run all of the fixups for this PHY */
362 err
= phy_init_hw(phydev
);
364 pr_err("PHY %d failed to initialize\n", phydev
->addr
);
368 err
= device_add(&phydev
->dev
);
370 pr_err("PHY %d failed to add\n", phydev
->addr
);
377 phydev
->bus
->phy_map
[phydev
->addr
] = NULL
;
380 EXPORT_SYMBOL(phy_device_register
);
383 * phy_find_first - finds the first PHY device on the bus
384 * @bus: the target MII bus
386 struct phy_device
*phy_find_first(struct mii_bus
*bus
)
390 for (addr
= 0; addr
< PHY_MAX_ADDR
; addr
++) {
391 if (bus
->phy_map
[addr
])
392 return bus
->phy_map
[addr
];
396 EXPORT_SYMBOL(phy_find_first
);
399 * phy_prepare_link - prepares the PHY layer to monitor link status
400 * @phydev: target phy_device struct
401 * @handler: callback function for link status change notifications
403 * Description: Tells the PHY infrastructure to handle the
404 * gory details on monitoring link status (whether through
405 * polling or an interrupt), and to call back to the
406 * connected device driver when the link status changes.
407 * If you want to monitor your own link state, don't call
410 static void phy_prepare_link(struct phy_device
*phydev
,
411 void (*handler
)(struct net_device
*))
413 phydev
->adjust_link
= handler
;
417 * phy_connect_direct - connect an ethernet device to a specific phy_device
418 * @dev: the network device to connect
419 * @phydev: the pointer to the phy device
420 * @handler: callback function for state change notifications
421 * @interface: PHY device's interface
423 int phy_connect_direct(struct net_device
*dev
, struct phy_device
*phydev
,
424 void (*handler
)(struct net_device
*),
425 phy_interface_t interface
)
429 rc
= phy_attach_direct(dev
, phydev
, phydev
->dev_flags
, interface
);
433 phy_prepare_link(phydev
, handler
);
434 phy_start_machine(phydev
, NULL
);
436 phy_start_interrupts(phydev
);
440 EXPORT_SYMBOL(phy_connect_direct
);
443 * phy_connect - connect an ethernet device to a PHY device
444 * @dev: the network device to connect
445 * @bus_id: the id string of the PHY device to connect
446 * @handler: callback function for state change notifications
447 * @interface: PHY device's interface
449 * Description: Convenience function for connecting ethernet
450 * devices to PHY devices. The default behavior is for
451 * the PHY infrastructure to handle everything, and only notify
452 * the connected driver when the link status changes. If you
453 * don't want, or can't use the provided functionality, you may
454 * choose to call only the subset of functions which provide
455 * the desired functionality.
457 struct phy_device
*phy_connect(struct net_device
*dev
, const char *bus_id
,
458 void (*handler
)(struct net_device
*),
459 phy_interface_t interface
)
461 struct phy_device
*phydev
;
465 /* Search the list of PHY devices on the mdio bus for the
466 * PHY with the requested name
468 d
= bus_find_device_by_name(&mdio_bus_type
, NULL
, bus_id
);
470 pr_err("PHY %s not found\n", bus_id
);
471 return ERR_PTR(-ENODEV
);
473 phydev
= to_phy_device(d
);
475 rc
= phy_connect_direct(dev
, phydev
, handler
, interface
);
481 EXPORT_SYMBOL(phy_connect
);
484 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
486 * @phydev: target phy_device struct
488 void phy_disconnect(struct phy_device
*phydev
)
491 phy_stop_interrupts(phydev
);
493 phy_stop_machine(phydev
);
495 phydev
->adjust_link
= NULL
;
499 EXPORT_SYMBOL(phy_disconnect
);
502 * phy_poll_reset - Safely wait until a PHY reset has properly completed
503 * @phydev: The PHY device to poll
505 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
506 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
507 * register must be polled until the BMCR_RESET bit clears.
509 * Furthermore, any attempts to write to PHY registers may have no effect
510 * or even generate MDIO bus errors until this is complete.
512 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
513 * standard and do not fully reset after the BMCR_RESET bit is set, and may
514 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
515 * effort to support such broken PHYs, this function is separate from the
516 * standard phy_init_hw() which will zero all the other bits in the BMCR
517 * and reapply all driver-specific and board-specific fixups.
519 static int phy_poll_reset(struct phy_device
*phydev
)
521 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
522 unsigned int retries
= 12;
527 ret
= phy_read(phydev
, MII_BMCR
);
530 } while (ret
& BMCR_RESET
&& --retries
);
531 if (ret
& BMCR_RESET
)
534 /* Some chips (smsc911x) may still need up to another 1ms after the
535 * BMCR_RESET bit is cleared before they are usable.
541 int phy_init_hw(struct phy_device
*phydev
)
545 if (!phydev
->drv
|| !phydev
->drv
->config_init
)
548 ret
= phy_write(phydev
, MII_BMCR
, BMCR_RESET
);
552 ret
= phy_poll_reset(phydev
);
556 ret
= phy_scan_fixups(phydev
);
560 return phydev
->drv
->config_init(phydev
);
562 EXPORT_SYMBOL(phy_init_hw
);
565 * phy_attach_direct - attach a network device to a given PHY device pointer
566 * @dev: network device to attach
567 * @phydev: Pointer to phy_device to attach
568 * @flags: PHY device's dev_flags
569 * @interface: PHY device's interface
571 * Description: Called by drivers to attach to a particular PHY
572 * device. The phy_device is found, and properly hooked up
573 * to the phy_driver. If no driver is attached, then the
574 * genphy_driver is used. The phy_device is given a ptr to
575 * the attaching device, and given a callback for link status
576 * change. The phy_device is returned to the attaching driver.
578 static int phy_attach_direct(struct net_device
*dev
, struct phy_device
*phydev
,
579 u32 flags
, phy_interface_t interface
)
581 struct device
*d
= &phydev
->dev
;
584 /* Assume that if there is no driver, that it doesn't
585 * exist, and we should use the genphy driver.
587 if (NULL
== d
->driver
) {
588 if (phydev
->is_c45
) {
589 pr_err("No driver for phy %x\n", phydev
->phy_id
);
593 d
->driver
= &genphy_driver
.driver
;
595 err
= d
->driver
->probe(d
);
597 err
= device_bind_driver(d
);
603 if (phydev
->attached_dev
) {
604 dev_err(&dev
->dev
, "PHY already attached\n");
608 phydev
->attached_dev
= dev
;
609 dev
->phydev
= phydev
;
611 phydev
->dev_flags
= flags
;
613 phydev
->interface
= interface
;
615 phydev
->state
= PHY_READY
;
617 /* Do initial configuration here, now that
618 * we have certain key parameters
619 * (dev_flags and interface)
621 err
= phy_init_hw(phydev
);
631 * phy_attach - attach a network device to a particular PHY device
632 * @dev: network device to attach
633 * @bus_id: Bus ID of PHY device to attach
634 * @interface: PHY device's interface
636 * Description: Same as phy_attach_direct() except that a PHY bus_id
637 * string is passed instead of a pointer to a struct phy_device.
639 struct phy_device
*phy_attach(struct net_device
*dev
, const char *bus_id
,
640 phy_interface_t interface
)
642 struct bus_type
*bus
= &mdio_bus_type
;
643 struct phy_device
*phydev
;
647 /* Search the list of PHY devices on the mdio bus for the
648 * PHY with the requested name
650 d
= bus_find_device_by_name(bus
, NULL
, bus_id
);
652 pr_err("PHY %s not found\n", bus_id
);
653 return ERR_PTR(-ENODEV
);
655 phydev
= to_phy_device(d
);
657 rc
= phy_attach_direct(dev
, phydev
, phydev
->dev_flags
, interface
);
663 EXPORT_SYMBOL(phy_attach
);
666 * phy_detach - detach a PHY device from its network device
667 * @phydev: target phy_device struct
669 void phy_detach(struct phy_device
*phydev
)
671 phydev
->attached_dev
->phydev
= NULL
;
672 phydev
->attached_dev
= NULL
;
675 /* If the device had no specific driver before (i.e. - it
676 * was using the generic driver), we unbind the device
677 * from the generic driver so that there's a chance a
678 * real driver could be loaded
680 if (phydev
->dev
.driver
== &genphy_driver
.driver
)
681 device_release_driver(&phydev
->dev
);
683 EXPORT_SYMBOL(phy_detach
);
685 int phy_suspend(struct phy_device
*phydev
)
687 struct phy_driver
*phydrv
= to_phy_driver(phydev
->dev
.driver
);
688 struct ethtool_wolinfo wol
;
690 /* If the device has WOL enabled, we cannot suspend the PHY */
691 wol
.cmd
= ETHTOOL_GWOL
;
692 phy_ethtool_get_wol(phydev
, &wol
);
697 return phydrv
->suspend(phydev
);
701 int phy_resume(struct phy_device
*phydev
)
703 struct phy_driver
*phydrv
= to_phy_driver(phydev
->dev
.driver
);
706 return phydrv
->resume(phydev
);
710 /* Generic PHY support and helper functions */
713 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
714 * @phydev: target phy_device struct
716 * Description: Writes MII_ADVERTISE with the appropriate values,
717 * after sanitizing the values to make sure we only advertise
718 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
719 * hasn't changed, and > 0 if it has changed.
721 static int genphy_config_advert(struct phy_device
*phydev
)
725 int err
, changed
= 0;
727 /* Only allow advertising what this PHY supports */
728 phydev
->advertising
&= phydev
->supported
;
729 advertise
= phydev
->advertising
;
731 /* Setup standard advertisement */
732 adv
= phy_read(phydev
, MII_ADVERTISE
);
738 adv
&= ~(ADVERTISE_ALL
| ADVERTISE_100BASE4
| ADVERTISE_PAUSE_CAP
|
739 ADVERTISE_PAUSE_ASYM
);
740 adv
|= ethtool_adv_to_mii_adv_t(advertise
);
743 err
= phy_write(phydev
, MII_ADVERTISE
, adv
);
750 /* Configure gigabit if it's supported */
751 if (phydev
->supported
& (SUPPORTED_1000baseT_Half
|
752 SUPPORTED_1000baseT_Full
)) {
753 adv
= phy_read(phydev
, MII_CTRL1000
);
759 adv
&= ~(ADVERTISE_1000FULL
| ADVERTISE_1000HALF
);
760 adv
|= ethtool_adv_to_mii_ctrl1000_t(advertise
);
763 err
= phy_write(phydev
, MII_CTRL1000
, adv
);
775 * genphy_setup_forced - configures/forces speed/duplex from @phydev
776 * @phydev: target phy_device struct
778 * Description: Configures MII_BMCR to force speed/duplex
779 * to the values in phydev. Assumes that the values are valid.
780 * Please see phy_sanitize_settings().
782 int genphy_setup_forced(struct phy_device
*phydev
)
788 phydev
->asym_pause
= 0;
790 if (SPEED_1000
== phydev
->speed
)
791 ctl
|= BMCR_SPEED1000
;
792 else if (SPEED_100
== phydev
->speed
)
793 ctl
|= BMCR_SPEED100
;
795 if (DUPLEX_FULL
== phydev
->duplex
)
796 ctl
|= BMCR_FULLDPLX
;
798 err
= phy_write(phydev
, MII_BMCR
, ctl
);
802 EXPORT_SYMBOL(genphy_setup_forced
);
805 * genphy_restart_aneg - Enable and Restart Autonegotiation
806 * @phydev: target phy_device struct
808 int genphy_restart_aneg(struct phy_device
*phydev
)
812 ctl
= phy_read(phydev
, MII_BMCR
);
817 ctl
|= BMCR_ANENABLE
| BMCR_ANRESTART
;
819 /* Don't isolate the PHY if we're negotiating */
820 ctl
&= ~BMCR_ISOLATE
;
822 ctl
= phy_write(phydev
, MII_BMCR
, ctl
);
826 EXPORT_SYMBOL(genphy_restart_aneg
);
830 * genphy_config_aneg - restart auto-negotiation or write BMCR
831 * @phydev: target phy_device struct
833 * Description: If auto-negotiation is enabled, we configure the
834 * advertising, and then restart auto-negotiation. If it is not
835 * enabled, then we write the BMCR.
837 int genphy_config_aneg(struct phy_device
*phydev
)
841 if (AUTONEG_ENABLE
!= phydev
->autoneg
)
842 return genphy_setup_forced(phydev
);
844 result
= genphy_config_advert(phydev
);
846 if (result
< 0) /* error */
850 /* Advertisement hasn't changed, but maybe aneg was never on to
851 * begin with? Or maybe phy was isolated?
853 int ctl
= phy_read(phydev
, MII_BMCR
);
858 if (!(ctl
& BMCR_ANENABLE
) || (ctl
& BMCR_ISOLATE
))
859 result
= 1; /* do restart aneg */
862 /* Only restart aneg if we are advertising something different
863 * than we were before.
866 result
= genphy_restart_aneg(phydev
);
870 EXPORT_SYMBOL(genphy_config_aneg
);
873 * genphy_update_link - update link status in @phydev
874 * @phydev: target phy_device struct
876 * Description: Update the value in phydev->link to reflect the
877 * current link value. In order to do this, we need to read
878 * the status register twice, keeping the second value.
880 int genphy_update_link(struct phy_device
*phydev
)
885 status
= phy_read(phydev
, MII_BMSR
);
890 /* Read link and autonegotiation status */
891 status
= phy_read(phydev
, MII_BMSR
);
896 if ((status
& BMSR_LSTATUS
) == 0)
903 EXPORT_SYMBOL(genphy_update_link
);
906 * genphy_read_status - check the link status and update current link state
907 * @phydev: target phy_device struct
909 * Description: Check the link, then figure out the current state
910 * by comparing what we advertise with what the link partner
911 * advertises. Start by checking the gigabit possibilities,
912 * then move on to 10/100.
914 int genphy_read_status(struct phy_device
*phydev
)
921 /* Update the link, but return if there was an error */
922 err
= genphy_update_link(phydev
);
926 phydev
->lp_advertising
= 0;
928 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
929 if (phydev
->supported
& (SUPPORTED_1000baseT_Half
930 | SUPPORTED_1000baseT_Full
)) {
931 lpagb
= phy_read(phydev
, MII_STAT1000
);
936 adv
= phy_read(phydev
, MII_CTRL1000
);
941 phydev
->lp_advertising
=
942 mii_stat1000_to_ethtool_lpa_t(lpagb
);
946 lpa
= phy_read(phydev
, MII_LPA
);
951 phydev
->lp_advertising
|= mii_lpa_to_ethtool_lpa_t(lpa
);
953 adv
= phy_read(phydev
, MII_ADVERTISE
);
960 phydev
->speed
= SPEED_10
;
961 phydev
->duplex
= DUPLEX_HALF
;
963 phydev
->asym_pause
= 0;
965 if (lpagb
& (LPA_1000FULL
| LPA_1000HALF
)) {
966 phydev
->speed
= SPEED_1000
;
968 if (lpagb
& LPA_1000FULL
)
969 phydev
->duplex
= DUPLEX_FULL
;
970 } else if (lpa
& (LPA_100FULL
| LPA_100HALF
)) {
971 phydev
->speed
= SPEED_100
;
973 if (lpa
& LPA_100FULL
)
974 phydev
->duplex
= DUPLEX_FULL
;
976 if (lpa
& LPA_10FULL
)
977 phydev
->duplex
= DUPLEX_FULL
;
979 if (phydev
->duplex
== DUPLEX_FULL
) {
980 phydev
->pause
= lpa
& LPA_PAUSE_CAP
? 1 : 0;
981 phydev
->asym_pause
= lpa
& LPA_PAUSE_ASYM
? 1 : 0;
984 int bmcr
= phy_read(phydev
, MII_BMCR
);
989 if (bmcr
& BMCR_FULLDPLX
)
990 phydev
->duplex
= DUPLEX_FULL
;
992 phydev
->duplex
= DUPLEX_HALF
;
994 if (bmcr
& BMCR_SPEED1000
)
995 phydev
->speed
= SPEED_1000
;
996 else if (bmcr
& BMCR_SPEED100
)
997 phydev
->speed
= SPEED_100
;
999 phydev
->speed
= SPEED_10
;
1002 phydev
->asym_pause
= 0;
1007 EXPORT_SYMBOL(genphy_read_status
);
1009 static int genphy_config_init(struct phy_device
*phydev
)
1014 /* For now, I'll claim that the generic driver supports
1015 * all possible port types
1017 features
= (SUPPORTED_TP
| SUPPORTED_MII
1018 | SUPPORTED_AUI
| SUPPORTED_FIBRE
|
1021 /* Do we support autonegotiation? */
1022 val
= phy_read(phydev
, MII_BMSR
);
1027 if (val
& BMSR_ANEGCAPABLE
)
1028 features
|= SUPPORTED_Autoneg
;
1030 if (val
& BMSR_100FULL
)
1031 features
|= SUPPORTED_100baseT_Full
;
1032 if (val
& BMSR_100HALF
)
1033 features
|= SUPPORTED_100baseT_Half
;
1034 if (val
& BMSR_10FULL
)
1035 features
|= SUPPORTED_10baseT_Full
;
1036 if (val
& BMSR_10HALF
)
1037 features
|= SUPPORTED_10baseT_Half
;
1039 if (val
& BMSR_ESTATEN
) {
1040 val
= phy_read(phydev
, MII_ESTATUS
);
1045 if (val
& ESTATUS_1000_TFULL
)
1046 features
|= SUPPORTED_1000baseT_Full
;
1047 if (val
& ESTATUS_1000_THALF
)
1048 features
|= SUPPORTED_1000baseT_Half
;
1051 phydev
->supported
= features
;
1052 phydev
->advertising
= features
;
1056 int genphy_suspend(struct phy_device
*phydev
)
1060 mutex_lock(&phydev
->lock
);
1062 value
= phy_read(phydev
, MII_BMCR
);
1063 phy_write(phydev
, MII_BMCR
, value
| BMCR_PDOWN
);
1065 mutex_unlock(&phydev
->lock
);
1069 EXPORT_SYMBOL(genphy_suspend
);
1071 int genphy_resume(struct phy_device
*phydev
)
1075 mutex_lock(&phydev
->lock
);
1077 value
= phy_read(phydev
, MII_BMCR
);
1078 phy_write(phydev
, MII_BMCR
, value
& ~BMCR_PDOWN
);
1080 mutex_unlock(&phydev
->lock
);
1084 EXPORT_SYMBOL(genphy_resume
);
1087 * phy_probe - probe and init a PHY device
1088 * @dev: device to probe and init
1090 * Description: Take care of setting up the phy_device structure,
1091 * set the state to READY (the driver's init function should
1092 * set it to STARTING if needed).
1094 static int phy_probe(struct device
*dev
)
1096 struct phy_device
*phydev
;
1097 struct phy_driver
*phydrv
;
1098 struct device_driver
*drv
;
1101 phydev
= to_phy_device(dev
);
1103 drv
= phydev
->dev
.driver
;
1104 phydrv
= to_phy_driver(drv
);
1105 phydev
->drv
= phydrv
;
1107 /* Disable the interrupt if the PHY doesn't support it
1108 * but the interrupt is still a valid one
1110 if (!(phydrv
->flags
& PHY_HAS_INTERRUPT
) &&
1111 phy_interrupt_is_valid(phydev
))
1112 phydev
->irq
= PHY_POLL
;
1114 if (phydrv
->flags
& PHY_IS_INTERNAL
)
1115 phydev
->is_internal
= true;
1117 mutex_lock(&phydev
->lock
);
1119 /* Start out supporting everything. Eventually,
1120 * a controller will attach, and may modify one
1121 * or both of these values
1123 phydev
->supported
= phydrv
->features
;
1124 phydev
->advertising
= phydrv
->features
;
1126 /* Set the state to READY by default */
1127 phydev
->state
= PHY_READY
;
1129 if (phydev
->drv
->probe
)
1130 err
= phydev
->drv
->probe(phydev
);
1132 mutex_unlock(&phydev
->lock
);
1137 static int phy_remove(struct device
*dev
)
1139 struct phy_device
*phydev
;
1141 phydev
= to_phy_device(dev
);
1143 mutex_lock(&phydev
->lock
);
1144 phydev
->state
= PHY_DOWN
;
1145 mutex_unlock(&phydev
->lock
);
1147 if (phydev
->drv
->remove
)
1148 phydev
->drv
->remove(phydev
);
1155 * phy_driver_register - register a phy_driver with the PHY layer
1156 * @new_driver: new phy_driver to register
1158 int phy_driver_register(struct phy_driver
*new_driver
)
1162 new_driver
->driver
.name
= new_driver
->name
;
1163 new_driver
->driver
.bus
= &mdio_bus_type
;
1164 new_driver
->driver
.probe
= phy_probe
;
1165 new_driver
->driver
.remove
= phy_remove
;
1167 retval
= driver_register(&new_driver
->driver
);
1170 pr_err("%s: Error %d in registering driver\n",
1171 new_driver
->name
, retval
);
1176 pr_debug("%s: Registered new driver\n", new_driver
->name
);
1180 EXPORT_SYMBOL(phy_driver_register
);
1182 int phy_drivers_register(struct phy_driver
*new_driver
, int n
)
1186 for (i
= 0; i
< n
; i
++) {
1187 ret
= phy_driver_register(new_driver
+ i
);
1190 phy_driver_unregister(new_driver
+ i
);
1196 EXPORT_SYMBOL(phy_drivers_register
);
1198 void phy_driver_unregister(struct phy_driver
*drv
)
1200 driver_unregister(&drv
->driver
);
1202 EXPORT_SYMBOL(phy_driver_unregister
);
1204 void phy_drivers_unregister(struct phy_driver
*drv
, int n
)
1208 for (i
= 0; i
< n
; i
++)
1209 phy_driver_unregister(drv
+ i
);
1211 EXPORT_SYMBOL(phy_drivers_unregister
);
1213 static struct phy_driver genphy_driver
= {
1214 .phy_id
= 0xffffffff,
1215 .phy_id_mask
= 0xffffffff,
1216 .name
= "Generic PHY",
1217 .config_init
= genphy_config_init
,
1219 .config_aneg
= genphy_config_aneg
,
1220 .read_status
= genphy_read_status
,
1221 .suspend
= genphy_suspend
,
1222 .resume
= genphy_resume
,
1223 .driver
= { .owner
= THIS_MODULE
, },
1226 static int __init
phy_init(void)
1230 rc
= mdio_bus_init();
1234 rc
= phy_driver_register(&genphy_driver
);
1241 static void __exit
phy_exit(void)
1243 phy_driver_unregister(&genphy_driver
);
1247 subsys_initcall(phy_init
);
1248 module_exit(phy_exit
);