1 /* Framework for configuring and reading PHY devices
2 * Based on code in sungem_phy.c and gianfar_phy.c
6 * Copyright (c) 2004 Freescale Semiconductor, Inc.
7 * Copyright (c) 2006, 2007 Maciej W. Rozycki
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/unistd.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>
33 #include <linux/timer.h>
34 #include <linux/workqueue.h>
35 #include <linux/mdio.h>
37 #include <linux/uaccess.h>
38 #include <linux/atomic.h>
43 * phy_print_status - Convenience function to print out the current phy status
44 * @phydev: the phy_device struct
46 void phy_print_status(struct phy_device
*phydev
)
49 pr_info("%s - Link is Up - %d/%s\n",
50 dev_name(&phydev
->dev
),
52 DUPLEX_FULL
== phydev
->duplex
? "Full" : "Half");
54 pr_info("%s - Link is Down\n", dev_name(&phydev
->dev
));
57 EXPORT_SYMBOL(phy_print_status
);
60 * phy_clear_interrupt - Ack the phy device's interrupt
61 * @phydev: the phy_device struct
63 * If the @phydev driver has an ack_interrupt function, call it to
64 * ack and clear the phy device's interrupt.
66 * Returns 0 on success on < 0 on error.
68 static int phy_clear_interrupt(struct phy_device
*phydev
)
70 if (phydev
->drv
->ack_interrupt
)
71 return phydev
->drv
->ack_interrupt(phydev
);
77 * phy_config_interrupt - configure the PHY device for the requested interrupts
78 * @phydev: the phy_device struct
79 * @interrupts: interrupt flags to configure for this @phydev
81 * Returns 0 on success on < 0 on error.
83 static int phy_config_interrupt(struct phy_device
*phydev
, u32 interrupts
)
85 phydev
->interrupts
= interrupts
;
86 if (phydev
->drv
->config_intr
)
87 return phydev
->drv
->config_intr(phydev
);
94 * phy_aneg_done - return auto-negotiation status
95 * @phydev: target phy_device struct
97 * Description: Reads the status register and returns 0 either if
98 * auto-negotiation is incomplete, or if there was an error.
99 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
101 static inline int phy_aneg_done(struct phy_device
*phydev
)
105 retval
= phy_read(phydev
, MII_BMSR
);
107 return (retval
< 0) ? retval
: (retval
& BMSR_ANEGCOMPLETE
);
110 /* A structure for mapping a particular speed and duplex
111 * combination to a particular SUPPORTED and ADVERTISED value
119 /* A mapping of all SUPPORTED settings to speed/duplex */
120 static const struct phy_setting settings
[] = {
123 .duplex
= DUPLEX_FULL
,
124 .setting
= SUPPORTED_10000baseT_Full
,
128 .duplex
= DUPLEX_FULL
,
129 .setting
= SUPPORTED_1000baseT_Full
,
133 .duplex
= DUPLEX_HALF
,
134 .setting
= SUPPORTED_1000baseT_Half
,
138 .duplex
= DUPLEX_FULL
,
139 .setting
= SUPPORTED_100baseT_Full
,
143 .duplex
= DUPLEX_HALF
,
144 .setting
= SUPPORTED_100baseT_Half
,
148 .duplex
= DUPLEX_FULL
,
149 .setting
= SUPPORTED_10baseT_Full
,
153 .duplex
= DUPLEX_HALF
,
154 .setting
= SUPPORTED_10baseT_Half
,
158 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
161 * phy_find_setting - find a PHY settings array entry that matches speed & duplex
162 * @speed: speed to match
163 * @duplex: duplex to match
165 * Description: Searches the settings array for the setting which
166 * matches the desired speed and duplex, and returns the index
167 * of that setting. Returns the index of the last setting if
168 * none of the others match.
170 static inline int phy_find_setting(int speed
, int duplex
)
174 while (idx
< ARRAY_SIZE(settings
) &&
175 (settings
[idx
].speed
!= speed
|| settings
[idx
].duplex
!= duplex
))
178 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
182 * phy_find_valid - find a PHY setting that matches the requested features mask
183 * @idx: The first index in settings[] to search
184 * @features: A mask of the valid settings
186 * Description: Returns the index of the first valid setting less
187 * than or equal to the one pointed to by idx, as determined by
188 * the mask in features. Returns the index of the last setting
189 * if nothing else matches.
191 static inline int phy_find_valid(int idx
, u32 features
)
193 while (idx
< MAX_NUM_SETTINGS
&& !(settings
[idx
].setting
& features
))
196 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
200 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
201 * @phydev: the target phy_device struct
203 * Description: Make sure the PHY is set to supported speeds and
204 * duplexes. Drop down by one in this order: 1000/FULL,
205 * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
207 static void phy_sanitize_settings(struct phy_device
*phydev
)
209 u32 features
= phydev
->supported
;
212 /* Sanitize settings based on PHY capabilities */
213 if ((features
& SUPPORTED_Autoneg
) == 0)
214 phydev
->autoneg
= AUTONEG_DISABLE
;
216 idx
= phy_find_valid(phy_find_setting(phydev
->speed
, phydev
->duplex
),
219 phydev
->speed
= settings
[idx
].speed
;
220 phydev
->duplex
= settings
[idx
].duplex
;
224 * phy_ethtool_sset - generic ethtool sset function, handles all the details
225 * @phydev: target phy_device struct
228 * A few notes about parameter checking:
229 * - We don't set port or transceiver, so we don't care what they
231 * - phy_start_aneg() will make sure forced settings are sane, and
232 * choose the next best ones from the ones selected, so we don't
233 * care if ethtool tries to give us bad values.
235 int phy_ethtool_sset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
237 u32 speed
= ethtool_cmd_speed(cmd
);
239 if (cmd
->phy_address
!= phydev
->addr
)
242 /* We make sure that we don't pass unsupported values in to the PHY */
243 cmd
->advertising
&= phydev
->supported
;
245 /* Verify the settings we care about. */
246 if (cmd
->autoneg
!= AUTONEG_ENABLE
&& cmd
->autoneg
!= AUTONEG_DISABLE
)
249 if (cmd
->autoneg
== AUTONEG_ENABLE
&& cmd
->advertising
== 0)
252 if (cmd
->autoneg
== AUTONEG_DISABLE
&&
253 ((speed
!= SPEED_1000
&&
254 speed
!= SPEED_100
&&
255 speed
!= SPEED_10
) ||
256 (cmd
->duplex
!= DUPLEX_HALF
&&
257 cmd
->duplex
!= DUPLEX_FULL
)))
260 phydev
->autoneg
= cmd
->autoneg
;
262 phydev
->speed
= speed
;
264 phydev
->advertising
= cmd
->advertising
;
266 if (AUTONEG_ENABLE
== cmd
->autoneg
)
267 phydev
->advertising
|= ADVERTISED_Autoneg
;
269 phydev
->advertising
&= ~ADVERTISED_Autoneg
;
271 phydev
->duplex
= cmd
->duplex
;
273 /* Restart the PHY */
274 phy_start_aneg(phydev
);
278 EXPORT_SYMBOL(phy_ethtool_sset
);
280 int phy_ethtool_gset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
282 cmd
->supported
= phydev
->supported
;
284 cmd
->advertising
= phydev
->advertising
;
285 cmd
->lp_advertising
= phydev
->lp_advertising
;
287 ethtool_cmd_speed_set(cmd
, phydev
->speed
);
288 cmd
->duplex
= phydev
->duplex
;
289 cmd
->port
= PORT_MII
;
290 cmd
->phy_address
= phydev
->addr
;
291 cmd
->transceiver
= phy_is_internal(phydev
) ?
292 XCVR_INTERNAL
: XCVR_EXTERNAL
;
293 cmd
->autoneg
= phydev
->autoneg
;
297 EXPORT_SYMBOL(phy_ethtool_gset
);
300 * phy_mii_ioctl - generic PHY MII ioctl interface
301 * @phydev: the phy_device struct
302 * @ifr: &struct ifreq for socket ioctl's
303 * @cmd: ioctl cmd to execute
305 * Note that this function is currently incompatible with the
306 * PHYCONTROL layer. It changes registers without regard to
307 * current state. Use at own risk.
309 int phy_mii_ioctl(struct phy_device
*phydev
, struct ifreq
*ifr
, int cmd
)
311 struct mii_ioctl_data
*mii_data
= if_mii(ifr
);
312 u16 val
= mii_data
->val_in
;
316 mii_data
->phy_id
= phydev
->addr
;
320 mii_data
->val_out
= mdiobus_read(phydev
->bus
, mii_data
->phy_id
,
325 if (mii_data
->phy_id
== phydev
->addr
) {
326 switch (mii_data
->reg_num
) {
328 if ((val
& (BMCR_RESET
| BMCR_ANENABLE
)) == 0)
329 phydev
->autoneg
= AUTONEG_DISABLE
;
331 phydev
->autoneg
= AUTONEG_ENABLE
;
332 if (!phydev
->autoneg
&& (val
& BMCR_FULLDPLX
))
333 phydev
->duplex
= DUPLEX_FULL
;
335 phydev
->duplex
= DUPLEX_HALF
;
336 if (!phydev
->autoneg
&& (val
& BMCR_SPEED1000
))
337 phydev
->speed
= SPEED_1000
;
338 else if (!phydev
->autoneg
&&
339 (val
& BMCR_SPEED100
))
340 phydev
->speed
= SPEED_100
;
343 phydev
->advertising
= val
;
351 mdiobus_write(phydev
->bus
, mii_data
->phy_id
,
352 mii_data
->reg_num
, val
);
354 if (mii_data
->reg_num
== MII_BMCR
&&
356 return phy_init_hw(phydev
);
360 if (phydev
->drv
->hwtstamp
)
361 return phydev
->drv
->hwtstamp(phydev
, ifr
);
368 EXPORT_SYMBOL(phy_mii_ioctl
);
371 * phy_start_aneg - start auto-negotiation for this PHY device
372 * @phydev: the phy_device struct
374 * Description: Sanitizes the settings (if we're not autonegotiating
375 * them), and then calls the driver's config_aneg function.
376 * If the PHYCONTROL Layer is operating, we change the state to
377 * reflect the beginning of Auto-negotiation or forcing.
379 int phy_start_aneg(struct phy_device
*phydev
)
383 mutex_lock(&phydev
->lock
);
385 if (AUTONEG_DISABLE
== phydev
->autoneg
)
386 phy_sanitize_settings(phydev
);
388 err
= phydev
->drv
->config_aneg(phydev
);
393 if (phydev
->state
!= PHY_HALTED
) {
394 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
395 phydev
->state
= PHY_AN
;
396 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
398 phydev
->state
= PHY_FORCING
;
399 phydev
->link_timeout
= PHY_FORCE_TIMEOUT
;
404 mutex_unlock(&phydev
->lock
);
407 EXPORT_SYMBOL(phy_start_aneg
);
411 * phy_start_machine - start PHY state machine tracking
412 * @phydev: the phy_device struct
413 * @handler: callback function for state change notifications
415 * Description: The PHY infrastructure can run a state machine
416 * which tracks whether the PHY is starting up, negotiating,
417 * etc. This function starts the timer which tracks the state
418 * of the PHY. If you want to be notified when the state changes,
419 * pass in the callback @handler, otherwise, pass NULL. If you
420 * want to maintain your own state machine, do not call this
423 void phy_start_machine(struct phy_device
*phydev
,
424 void (*handler
)(struct net_device
*))
426 phydev
->adjust_state
= handler
;
428 queue_delayed_work(system_power_efficient_wq
, &phydev
->state_queue
, HZ
);
432 * phy_stop_machine - stop the PHY state machine tracking
433 * @phydev: target phy_device struct
435 * Description: Stops the state machine timer, sets the state to UP
436 * (unless it wasn't up yet). This function must be called BEFORE
439 void phy_stop_machine(struct phy_device
*phydev
)
441 cancel_delayed_work_sync(&phydev
->state_queue
);
443 mutex_lock(&phydev
->lock
);
444 if (phydev
->state
> PHY_UP
)
445 phydev
->state
= PHY_UP
;
446 mutex_unlock(&phydev
->lock
);
448 phydev
->adjust_state
= NULL
;
452 * phy_error - enter HALTED state for this PHY device
453 * @phydev: target phy_device struct
455 * Moves the PHY to the HALTED state in response to a read
456 * or write error, and tells the controller the link is down.
457 * Must not be called from interrupt context, or while the
458 * phydev->lock is held.
460 static void phy_error(struct phy_device
*phydev
)
462 mutex_lock(&phydev
->lock
);
463 phydev
->state
= PHY_HALTED
;
464 mutex_unlock(&phydev
->lock
);
468 * phy_interrupt - PHY interrupt handler
469 * @irq: interrupt line
470 * @phy_dat: phy_device pointer
472 * Description: When a PHY interrupt occurs, the handler disables
473 * interrupts, and schedules a work task to clear the interrupt.
475 static irqreturn_t
phy_interrupt(int irq
, void *phy_dat
)
477 struct phy_device
*phydev
= phy_dat
;
479 if (PHY_HALTED
== phydev
->state
)
480 return IRQ_NONE
; /* It can't be ours. */
482 /* The MDIO bus is not allowed to be written in interrupt
483 * context, so we need to disable the irq here. A work
484 * queue will write the PHY to disable and clear the
485 * interrupt, and then reenable the irq line.
487 disable_irq_nosync(irq
);
488 atomic_inc(&phydev
->irq_disable
);
490 queue_work(system_power_efficient_wq
, &phydev
->phy_queue
);
496 * phy_enable_interrupts - Enable the interrupts from the PHY side
497 * @phydev: target phy_device struct
499 static int phy_enable_interrupts(struct phy_device
*phydev
)
503 err
= phy_clear_interrupt(phydev
);
508 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
514 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
515 * @phydev: target phy_device struct
517 static int phy_disable_interrupts(struct phy_device
*phydev
)
521 /* Disable PHY interrupts */
522 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_DISABLED
);
527 /* Clear the interrupt */
528 err
= phy_clear_interrupt(phydev
);
542 * phy_start_interrupts - request and enable interrupts for a PHY device
543 * @phydev: target phy_device struct
545 * Description: Request the interrupt for the given PHY.
546 * If this fails, then we set irq to PHY_POLL.
547 * Otherwise, we enable the interrupts in the PHY.
548 * This should only be called with a valid IRQ number.
549 * Returns 0 on success or < 0 on error.
551 int phy_start_interrupts(struct phy_device
*phydev
)
553 atomic_set(&phydev
->irq_disable
, 0);
554 if (request_irq(phydev
->irq
, phy_interrupt
,
558 pr_warn("%s: Can't get IRQ %d (PHY)\n",
559 phydev
->bus
->name
, phydev
->irq
);
560 phydev
->irq
= PHY_POLL
;
564 return phy_enable_interrupts(phydev
);
566 EXPORT_SYMBOL(phy_start_interrupts
);
569 * phy_stop_interrupts - disable interrupts from a PHY device
570 * @phydev: target phy_device struct
572 int phy_stop_interrupts(struct phy_device
*phydev
)
576 err
= phy_disable_interrupts(phydev
);
581 free_irq(phydev
->irq
, phydev
);
583 /* Cannot call flush_scheduled_work() here as desired because
584 * of rtnl_lock(), but we do not really care about what would
585 * be done, except from enable_irq(), so cancel any work
586 * possibly pending and take care of the matter below.
588 cancel_work_sync(&phydev
->phy_queue
);
589 /* If work indeed has been cancelled, disable_irq() will have
590 * been left unbalanced from phy_interrupt() and enable_irq()
591 * has to be called so that other devices on the line work.
593 while (atomic_dec_return(&phydev
->irq_disable
) >= 0)
594 enable_irq(phydev
->irq
);
598 EXPORT_SYMBOL(phy_stop_interrupts
);
602 * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
603 * @work: work_struct that describes the work to be done
605 void phy_change(struct work_struct
*work
)
607 struct phy_device
*phydev
=
608 container_of(work
, struct phy_device
, phy_queue
);
610 if (phydev
->drv
->did_interrupt
&&
611 !phydev
->drv
->did_interrupt(phydev
))
614 if (phy_disable_interrupts(phydev
))
617 mutex_lock(&phydev
->lock
);
618 if ((PHY_RUNNING
== phydev
->state
) || (PHY_NOLINK
== phydev
->state
))
619 phydev
->state
= PHY_CHANGELINK
;
620 mutex_unlock(&phydev
->lock
);
622 atomic_dec(&phydev
->irq_disable
);
623 enable_irq(phydev
->irq
);
625 /* Reenable interrupts */
626 if (PHY_HALTED
!= phydev
->state
&&
627 phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
))
630 /* reschedule state queue work to run as soon as possible */
631 cancel_delayed_work_sync(&phydev
->state_queue
);
632 queue_delayed_work(system_power_efficient_wq
, &phydev
->state_queue
, 0);
637 atomic_dec(&phydev
->irq_disable
);
638 enable_irq(phydev
->irq
);
642 disable_irq(phydev
->irq
);
643 atomic_inc(&phydev
->irq_disable
);
649 * phy_stop - Bring down the PHY link, and stop checking the status
650 * @phydev: target phy_device struct
652 void phy_stop(struct phy_device
*phydev
)
654 mutex_lock(&phydev
->lock
);
656 if (PHY_HALTED
== phydev
->state
)
659 if (phy_interrupt_is_valid(phydev
)) {
660 /* Disable PHY Interrupts */
661 phy_config_interrupt(phydev
, PHY_INTERRUPT_DISABLED
);
663 /* Clear any pending interrupts */
664 phy_clear_interrupt(phydev
);
667 phydev
->state
= PHY_HALTED
;
670 mutex_unlock(&phydev
->lock
);
672 /* Cannot call flush_scheduled_work() here as desired because
673 * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
674 * will not reenable interrupts.
677 EXPORT_SYMBOL(phy_stop
);
681 * phy_start - start or restart a PHY device
682 * @phydev: target phy_device struct
684 * Description: Indicates the attached device's readiness to
685 * handle PHY-related work. Used during startup to start the
686 * PHY, and after a call to phy_stop() to resume operation.
687 * Also used to indicate the MDIO bus has cleared an error
690 void phy_start(struct phy_device
*phydev
)
692 mutex_lock(&phydev
->lock
);
694 switch (phydev
->state
) {
696 phydev
->state
= PHY_PENDING
;
699 phydev
->state
= PHY_UP
;
702 phydev
->state
= PHY_RESUMING
;
706 mutex_unlock(&phydev
->lock
);
708 EXPORT_SYMBOL(phy_start
);
711 * phy_state_machine - Handle the state machine
712 * @work: work_struct that describes the work to be done
714 void phy_state_machine(struct work_struct
*work
)
716 struct delayed_work
*dwork
= to_delayed_work(work
);
717 struct phy_device
*phydev
=
718 container_of(dwork
, struct phy_device
, state_queue
);
719 int needs_aneg
= 0, do_suspend
= 0;
722 mutex_lock(&phydev
->lock
);
724 if (phydev
->adjust_state
)
725 phydev
->adjust_state(phydev
->attached_dev
);
727 switch (phydev
->state
) {
736 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
740 err
= phy_read_status(phydev
);
745 /* If the link is down, give up on negotiation for now */
747 phydev
->state
= PHY_NOLINK
;
748 netif_carrier_off(phydev
->attached_dev
);
749 phydev
->adjust_link(phydev
->attached_dev
);
753 /* Check if negotiation is done. Break if there's an error */
754 err
= phy_aneg_done(phydev
);
758 /* If AN is done, we're running */
760 phydev
->state
= PHY_RUNNING
;
761 netif_carrier_on(phydev
->attached_dev
);
762 phydev
->adjust_link(phydev
->attached_dev
);
764 } else if (0 == phydev
->link_timeout
--) {
766 /* If we have the magic_aneg bit, we try again */
767 if (phydev
->drv
->flags
& PHY_HAS_MAGICANEG
)
772 err
= phy_read_status(phydev
);
778 phydev
->state
= PHY_RUNNING
;
779 netif_carrier_on(phydev
->attached_dev
);
780 phydev
->adjust_link(phydev
->attached_dev
);
784 err
= genphy_update_link(phydev
);
790 phydev
->state
= PHY_RUNNING
;
791 netif_carrier_on(phydev
->attached_dev
);
793 if (0 == phydev
->link_timeout
--)
797 phydev
->adjust_link(phydev
->attached_dev
);
800 /* Only register a CHANGE if we are
801 * polling or ignoring interrupts
803 if (!phy_interrupt_is_valid(phydev
))
804 phydev
->state
= PHY_CHANGELINK
;
807 err
= phy_read_status(phydev
);
813 phydev
->state
= PHY_RUNNING
;
814 netif_carrier_on(phydev
->attached_dev
);
816 phydev
->state
= PHY_NOLINK
;
817 netif_carrier_off(phydev
->attached_dev
);
820 phydev
->adjust_link(phydev
->attached_dev
);
822 if (phy_interrupt_is_valid(phydev
))
823 err
= phy_config_interrupt(phydev
,
824 PHY_INTERRUPT_ENABLED
);
829 netif_carrier_off(phydev
->attached_dev
);
830 phydev
->adjust_link(phydev
->attached_dev
);
836 err
= phy_clear_interrupt(phydev
);
841 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
846 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
847 err
= phy_aneg_done(phydev
);
851 /* err > 0 if AN is done.
852 * Otherwise, it's 0, and we're still waiting for AN
855 err
= phy_read_status(phydev
);
860 phydev
->state
= PHY_RUNNING
;
861 netif_carrier_on(phydev
->attached_dev
);
863 phydev
->state
= PHY_NOLINK
;
865 phydev
->adjust_link(phydev
->attached_dev
);
867 phydev
->state
= PHY_AN
;
868 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
871 err
= phy_read_status(phydev
);
876 phydev
->state
= PHY_RUNNING
;
877 netif_carrier_on(phydev
->attached_dev
);
879 phydev
->state
= PHY_NOLINK
;
881 phydev
->adjust_link(phydev
->attached_dev
);
886 mutex_unlock(&phydev
->lock
);
889 err
= phy_start_aneg(phydev
);
897 queue_delayed_work(system_power_efficient_wq
, &phydev
->state_queue
,
898 PHY_STATE_TIME
* HZ
);
901 void phy_mac_interrupt(struct phy_device
*phydev
, int new_link
)
903 cancel_work_sync(&phydev
->phy_queue
);
904 phydev
->link
= new_link
;
905 schedule_work(&phydev
->phy_queue
);
907 EXPORT_SYMBOL(phy_mac_interrupt
);
909 static inline void mmd_phy_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
912 /* Write the desired MMD Devad */
913 bus
->write(bus
, addr
, MII_MMD_CTRL
, devad
);
915 /* Write the desired MMD register address */
916 bus
->write(bus
, addr
, MII_MMD_DATA
, prtad
);
918 /* Select the Function : DATA with no post increment */
919 bus
->write(bus
, addr
, MII_MMD_CTRL
, (devad
| MII_MMD_CTRL_NOINCR
));
923 * phy_read_mmd_indirect - reads data from the MMD registers
924 * @bus: the target MII bus
925 * @prtad: MMD Address
927 * @addr: PHY address on the MII bus
929 * Description: it reads data from the MMD registers (clause 22 to access to
930 * clause 45) of the specified phy address.
931 * To read these register we have:
932 * 1) Write reg 13 // DEVAD
933 * 2) Write reg 14 // MMD Address
934 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
935 * 3) Read reg 14 // Read MMD data
937 static int phy_read_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
940 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
942 /* Read the content of the MMD's selected register */
943 return bus
->read(bus
, addr
, MII_MMD_DATA
);
947 * phy_write_mmd_indirect - writes data to the MMD registers
948 * @bus: the target MII bus
949 * @prtad: MMD Address
951 * @addr: PHY address on the MII bus
952 * @data: data to write in the MMD register
954 * Description: Write data from the MMD registers of the specified
956 * To write these register we have:
957 * 1) Write reg 13 // DEVAD
958 * 2) Write reg 14 // MMD Address
959 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
960 * 3) Write reg 14 // Write MMD data
962 static void phy_write_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
965 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
967 /* Write the data into MMD's selected register */
968 bus
->write(bus
, addr
, MII_MMD_DATA
, data
);
972 * phy_init_eee - init and check the EEE feature
973 * @phydev: target phy_device struct
974 * @clk_stop_enable: PHY may stop the clock during LPI
976 * Description: it checks if the Energy-Efficient Ethernet (EEE)
977 * is supported by looking at the MMD registers 3.20 and 7.60/61
978 * and it programs the MMD register 3.0 setting the "Clock stop enable"
981 int phy_init_eee(struct phy_device
*phydev
, bool clk_stop_enable
)
983 /* According to 802.3az,the EEE is supported only in full duplex-mode.
984 * Also EEE feature is active when core is operating with MII, GMII
987 if ((phydev
->duplex
== DUPLEX_FULL
) &&
988 ((phydev
->interface
== PHY_INTERFACE_MODE_MII
) ||
989 (phydev
->interface
== PHY_INTERFACE_MODE_GMII
) ||
990 (phydev
->interface
== PHY_INTERFACE_MODE_RGMII
))) {
991 int eee_lp
, eee_cap
, eee_adv
;
995 /* Read phy status to properly get the right settings */
996 status
= phy_read_status(phydev
);
1000 /* First check if the EEE ability is supported */
1001 eee_cap
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
1002 MDIO_MMD_PCS
, phydev
->addr
);
1006 cap
= mmd_eee_cap_to_ethtool_sup_t(eee_cap
);
1008 return -EPROTONOSUPPORT
;
1010 /* Check which link settings negotiated and verify it in
1011 * the EEE advertising registers.
1013 eee_lp
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1014 MDIO_MMD_AN
, phydev
->addr
);
1018 eee_adv
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1019 MDIO_MMD_AN
, phydev
->addr
);
1023 adv
= mmd_eee_adv_to_ethtool_adv_t(eee_adv
);
1024 lp
= mmd_eee_adv_to_ethtool_adv_t(eee_lp
);
1025 idx
= phy_find_setting(phydev
->speed
, phydev
->duplex
);
1026 if (!(lp
& adv
& settings
[idx
].setting
))
1027 return -EPROTONOSUPPORT
;
1029 if (clk_stop_enable
) {
1030 /* Configure the PHY to stop receiving xMII
1031 * clock while it is signaling LPI.
1033 int val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1039 val
|= MDIO_PCS_CTRL1_CLKSTOP_EN
;
1040 phy_write_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1041 MDIO_MMD_PCS
, phydev
->addr
, val
);
1044 return 0; /* EEE supported */
1047 return -EPROTONOSUPPORT
;
1049 EXPORT_SYMBOL(phy_init_eee
);
1052 * phy_get_eee_err - report the EEE wake error count
1053 * @phydev: target phy_device struct
1055 * Description: it is to report the number of time where the PHY
1056 * failed to complete its normal wake sequence.
1058 int phy_get_eee_err(struct phy_device
*phydev
)
1060 return phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_WK_ERR
,
1061 MDIO_MMD_PCS
, phydev
->addr
);
1063 EXPORT_SYMBOL(phy_get_eee_err
);
1066 * phy_ethtool_get_eee - get EEE supported and status
1067 * @phydev: target phy_device struct
1068 * @data: ethtool_eee data
1070 * Description: it reportes the Supported/Advertisement/LP Advertisement
1073 int phy_ethtool_get_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1077 /* Get Supported EEE */
1078 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
1079 MDIO_MMD_PCS
, phydev
->addr
);
1082 data
->supported
= mmd_eee_cap_to_ethtool_sup_t(val
);
1084 /* Get advertisement EEE */
1085 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1086 MDIO_MMD_AN
, phydev
->addr
);
1089 data
->advertised
= mmd_eee_adv_to_ethtool_adv_t(val
);
1091 /* Get LP advertisement EEE */
1092 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1093 MDIO_MMD_AN
, phydev
->addr
);
1096 data
->lp_advertised
= mmd_eee_adv_to_ethtool_adv_t(val
);
1100 EXPORT_SYMBOL(phy_ethtool_get_eee
);
1103 * phy_ethtool_set_eee - set EEE supported and status
1104 * @phydev: target phy_device struct
1105 * @data: ethtool_eee data
1107 * Description: it is to program the Advertisement EEE register.
1109 int phy_ethtool_set_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1113 val
= ethtool_adv_to_mmd_eee_adv_t(data
->advertised
);
1114 phy_write_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
, MDIO_MMD_AN
,
1119 EXPORT_SYMBOL(phy_ethtool_set_eee
);
1121 int phy_ethtool_set_wol(struct phy_device
*phydev
, struct ethtool_wolinfo
*wol
)
1123 if (phydev
->drv
->set_wol
)
1124 return phydev
->drv
->set_wol(phydev
, wol
);
1128 EXPORT_SYMBOL(phy_ethtool_set_wol
);
1130 void phy_ethtool_get_wol(struct phy_device
*phydev
, struct ethtool_wolinfo
*wol
)
1132 if (phydev
->drv
->get_wol
)
1133 phydev
->drv
->get_wol(phydev
, wol
);
1135 EXPORT_SYMBOL(phy_ethtool_get_wol
);