2 * drivers/net/phy/phy.c
4 * Framework for configuring and reading PHY devices
5 * Based on code in sungem_phy.c and gianfar_phy.c
9 * Copyright (c) 2004 Freescale Semiconductor, Inc.
10 * Copyright (c) 2006, 2007 Maciej W. Rozycki
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/unistd.h>
25 #include <linux/interrupt.h>
26 #include <linux/init.h>
27 #include <linux/delay.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
32 #include <linux/module.h>
33 #include <linux/mii.h>
34 #include <linux/ethtool.h>
35 #include <linux/phy.h>
36 #include <linux/timer.h>
37 #include <linux/workqueue.h>
38 #include <linux/mdio.h>
40 #include <linux/atomic.h>
43 #include <asm/uaccess.h>
46 * phy_print_status - Convenience function to print out the current phy status
47 * @phydev: the phy_device struct
49 void phy_print_status(struct phy_device
*phydev
)
52 pr_info("%s - Link is Up - %d/%s\n",
53 dev_name(&phydev
->dev
),
55 DUPLEX_FULL
== phydev
->duplex
? "Full" : "Half");
57 pr_info("%s - Link is Down\n", dev_name(&phydev
->dev
));
59 EXPORT_SYMBOL(phy_print_status
);
62 * phy_clear_interrupt - Ack the phy device's interrupt
63 * @phydev: the phy_device struct
65 * If the @phydev driver has an ack_interrupt function, call it to
66 * ack and clear the phy device's interrupt.
68 * Returns 0 on success on < 0 on error.
70 static int phy_clear_interrupt(struct phy_device
*phydev
)
74 if (phydev
->drv
->ack_interrupt
)
75 err
= phydev
->drv
->ack_interrupt(phydev
);
81 * phy_config_interrupt - configure the PHY device for the requested interrupts
82 * @phydev: the phy_device struct
83 * @interrupts: interrupt flags to configure for this @phydev
85 * Returns 0 on success on < 0 on error.
87 static int phy_config_interrupt(struct phy_device
*phydev
, u32 interrupts
)
91 phydev
->interrupts
= interrupts
;
92 if (phydev
->drv
->config_intr
)
93 err
= phydev
->drv
->config_intr(phydev
);
100 * phy_aneg_done - return auto-negotiation status
101 * @phydev: target phy_device struct
103 * Description: Reads the status register and returns 0 either if
104 * auto-negotiation is incomplete, or if there was an error.
105 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
107 static inline int phy_aneg_done(struct phy_device
*phydev
)
111 retval
= phy_read(phydev
, MII_BMSR
);
113 return (retval
< 0) ? retval
: (retval
& BMSR_ANEGCOMPLETE
);
116 /* A structure for mapping a particular speed and duplex
117 * combination to a particular SUPPORTED and ADVERTISED value */
124 /* A mapping of all SUPPORTED settings to speed/duplex */
125 static const struct phy_setting settings
[] = {
128 .duplex
= DUPLEX_FULL
,
129 .setting
= SUPPORTED_10000baseT_Full
,
133 .duplex
= DUPLEX_FULL
,
134 .setting
= SUPPORTED_1000baseT_Full
,
138 .duplex
= DUPLEX_HALF
,
139 .setting
= SUPPORTED_1000baseT_Half
,
143 .duplex
= DUPLEX_FULL
,
144 .setting
= SUPPORTED_100baseT_Full
,
148 .duplex
= DUPLEX_HALF
,
149 .setting
= SUPPORTED_100baseT_Half
,
153 .duplex
= DUPLEX_FULL
,
154 .setting
= SUPPORTED_10baseT_Full
,
158 .duplex
= DUPLEX_HALF
,
159 .setting
= SUPPORTED_10baseT_Half
,
163 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
166 * phy_find_setting - find a PHY settings array entry that matches speed & duplex
167 * @speed: speed to match
168 * @duplex: duplex to match
170 * Description: Searches the settings array for the setting which
171 * matches the desired speed and duplex, and returns the index
172 * of that setting. Returns the index of the last setting if
173 * none of the others match.
175 static inline int phy_find_setting(int speed
, int duplex
)
179 while (idx
< ARRAY_SIZE(settings
) &&
180 (settings
[idx
].speed
!= speed
||
181 settings
[idx
].duplex
!= duplex
))
184 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
188 * phy_find_valid - find a PHY setting that matches the requested features mask
189 * @idx: The first index in settings[] to search
190 * @features: A mask of the valid settings
192 * Description: Returns the index of the first valid setting less
193 * than or equal to the one pointed to by idx, as determined by
194 * the mask in features. Returns the index of the last setting
195 * if nothing else matches.
197 static inline int phy_find_valid(int idx
, u32 features
)
199 while (idx
< MAX_NUM_SETTINGS
&& !(settings
[idx
].setting
& features
))
202 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
206 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
207 * @phydev: the target phy_device struct
209 * Description: Make sure the PHY is set to supported speeds and
210 * duplexes. Drop down by one in this order: 1000/FULL,
211 * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
213 static void phy_sanitize_settings(struct phy_device
*phydev
)
215 u32 features
= phydev
->supported
;
218 /* Sanitize settings based on PHY capabilities */
219 if ((features
& SUPPORTED_Autoneg
) == 0)
220 phydev
->autoneg
= AUTONEG_DISABLE
;
222 idx
= phy_find_valid(phy_find_setting(phydev
->speed
, phydev
->duplex
),
225 phydev
->speed
= settings
[idx
].speed
;
226 phydev
->duplex
= settings
[idx
].duplex
;
230 * phy_ethtool_sset - generic ethtool sset function, handles all the details
231 * @phydev: target phy_device struct
234 * A few notes about parameter checking:
235 * - We don't set port or transceiver, so we don't care what they
237 * - phy_start_aneg() will make sure forced settings are sane, and
238 * choose the next best ones from the ones selected, so we don't
239 * care if ethtool tries to give us bad values.
241 int phy_ethtool_sset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
243 u32 speed
= ethtool_cmd_speed(cmd
);
245 if (cmd
->phy_address
!= phydev
->addr
)
248 /* We make sure that we don't pass unsupported
249 * values in to the PHY */
250 cmd
->advertising
&= phydev
->supported
;
252 /* Verify the settings we care about. */
253 if (cmd
->autoneg
!= AUTONEG_ENABLE
&& cmd
->autoneg
!= AUTONEG_DISABLE
)
256 if (cmd
->autoneg
== AUTONEG_ENABLE
&& cmd
->advertising
== 0)
259 if (cmd
->autoneg
== AUTONEG_DISABLE
&&
260 ((speed
!= SPEED_1000
&&
261 speed
!= SPEED_100
&&
262 speed
!= SPEED_10
) ||
263 (cmd
->duplex
!= DUPLEX_HALF
&&
264 cmd
->duplex
!= DUPLEX_FULL
)))
267 phydev
->autoneg
= cmd
->autoneg
;
269 phydev
->speed
= speed
;
271 phydev
->advertising
= cmd
->advertising
;
273 if (AUTONEG_ENABLE
== cmd
->autoneg
)
274 phydev
->advertising
|= ADVERTISED_Autoneg
;
276 phydev
->advertising
&= ~ADVERTISED_Autoneg
;
278 phydev
->duplex
= cmd
->duplex
;
280 /* Restart the PHY */
281 phy_start_aneg(phydev
);
285 EXPORT_SYMBOL(phy_ethtool_sset
);
287 int phy_ethtool_gset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
289 cmd
->supported
= phydev
->supported
;
291 cmd
->advertising
= phydev
->advertising
;
293 ethtool_cmd_speed_set(cmd
, phydev
->speed
);
294 cmd
->duplex
= phydev
->duplex
;
295 cmd
->port
= PORT_MII
;
296 cmd
->phy_address
= phydev
->addr
;
297 cmd
->transceiver
= XCVR_EXTERNAL
;
298 cmd
->autoneg
= phydev
->autoneg
;
302 EXPORT_SYMBOL(phy_ethtool_gset
);
305 * phy_mii_ioctl - generic PHY MII ioctl interface
306 * @phydev: the phy_device struct
307 * @ifr: &struct ifreq for socket ioctl's
308 * @cmd: ioctl cmd to execute
310 * Note that this function is currently incompatible with the
311 * PHYCONTROL layer. It changes registers without regard to
312 * current state. Use at own risk.
314 int phy_mii_ioctl(struct phy_device
*phydev
,
315 struct ifreq
*ifr
, int cmd
)
317 struct mii_ioctl_data
*mii_data
= if_mii(ifr
);
318 u16 val
= mii_data
->val_in
;
322 mii_data
->phy_id
= phydev
->addr
;
326 mii_data
->val_out
= mdiobus_read(phydev
->bus
, mii_data
->phy_id
,
331 if (mii_data
->phy_id
== phydev
->addr
) {
332 switch(mii_data
->reg_num
) {
334 if ((val
& (BMCR_RESET
|BMCR_ANENABLE
)) == 0)
335 phydev
->autoneg
= AUTONEG_DISABLE
;
337 phydev
->autoneg
= AUTONEG_ENABLE
;
338 if ((!phydev
->autoneg
) && (val
& BMCR_FULLDPLX
))
339 phydev
->duplex
= DUPLEX_FULL
;
341 phydev
->duplex
= DUPLEX_HALF
;
342 if ((!phydev
->autoneg
) &&
343 (val
& BMCR_SPEED1000
))
344 phydev
->speed
= SPEED_1000
;
345 else if ((!phydev
->autoneg
) &&
346 (val
& BMCR_SPEED100
))
347 phydev
->speed
= SPEED_100
;
350 phydev
->advertising
= val
;
358 mdiobus_write(phydev
->bus
, mii_data
->phy_id
,
359 mii_data
->reg_num
, val
);
361 if (mii_data
->reg_num
== MII_BMCR
&&
363 phydev
->drv
->config_init
) {
364 phy_scan_fixups(phydev
);
365 phydev
->drv
->config_init(phydev
);
370 if (phydev
->drv
->hwtstamp
)
371 return phydev
->drv
->hwtstamp(phydev
, ifr
);
380 EXPORT_SYMBOL(phy_mii_ioctl
);
383 * phy_start_aneg - start auto-negotiation for this PHY device
384 * @phydev: the phy_device struct
386 * Description: Sanitizes the settings (if we're not autonegotiating
387 * them), and then calls the driver's config_aneg function.
388 * If the PHYCONTROL Layer is operating, we change the state to
389 * reflect the beginning of Auto-negotiation or forcing.
391 int phy_start_aneg(struct phy_device
*phydev
)
395 mutex_lock(&phydev
->lock
);
397 if (AUTONEG_DISABLE
== phydev
->autoneg
)
398 phy_sanitize_settings(phydev
);
400 err
= phydev
->drv
->config_aneg(phydev
);
405 if (phydev
->state
!= PHY_HALTED
) {
406 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
407 phydev
->state
= PHY_AN
;
408 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
410 phydev
->state
= PHY_FORCING
;
411 phydev
->link_timeout
= PHY_FORCE_TIMEOUT
;
416 mutex_unlock(&phydev
->lock
);
419 EXPORT_SYMBOL(phy_start_aneg
);
422 static void phy_change(struct work_struct
*work
);
425 * phy_start_machine - start PHY state machine tracking
426 * @phydev: the phy_device struct
427 * @handler: callback function for state change notifications
429 * Description: The PHY infrastructure can run a state machine
430 * which tracks whether the PHY is starting up, negotiating,
431 * etc. This function starts the timer which tracks the state
432 * of the PHY. If you want to be notified when the state changes,
433 * pass in the callback @handler, otherwise, pass NULL. If you
434 * want to maintain your own state machine, do not call this
437 void phy_start_machine(struct phy_device
*phydev
,
438 void (*handler
)(struct net_device
*))
440 phydev
->adjust_state
= handler
;
442 schedule_delayed_work(&phydev
->state_queue
, HZ
);
446 * phy_stop_machine - stop the PHY state machine tracking
447 * @phydev: target phy_device struct
449 * Description: Stops the state machine timer, sets the state to UP
450 * (unless it wasn't up yet). This function must be called BEFORE
453 void phy_stop_machine(struct phy_device
*phydev
)
455 cancel_delayed_work_sync(&phydev
->state_queue
);
457 mutex_lock(&phydev
->lock
);
458 if (phydev
->state
> PHY_UP
)
459 phydev
->state
= PHY_UP
;
460 mutex_unlock(&phydev
->lock
);
462 phydev
->adjust_state
= NULL
;
466 * phy_force_reduction - reduce PHY speed/duplex settings by one step
467 * @phydev: target phy_device struct
469 * Description: Reduces the speed/duplex settings by one notch,
471 * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
472 * The function bottoms out at 10/HALF.
474 static void phy_force_reduction(struct phy_device
*phydev
)
478 idx
= phy_find_setting(phydev
->speed
, phydev
->duplex
);
482 idx
= phy_find_valid(idx
, phydev
->supported
);
484 phydev
->speed
= settings
[idx
].speed
;
485 phydev
->duplex
= settings
[idx
].duplex
;
487 pr_info("Trying %d/%s\n",
488 phydev
->speed
, DUPLEX_FULL
== phydev
->duplex
? "FULL" : "HALF");
493 * phy_error - enter HALTED state for this PHY device
494 * @phydev: target phy_device struct
496 * Moves the PHY to the HALTED state in response to a read
497 * or write error, and tells the controller the link is down.
498 * Must not be called from interrupt context, or while the
499 * phydev->lock is held.
501 static void phy_error(struct phy_device
*phydev
)
503 mutex_lock(&phydev
->lock
);
504 phydev
->state
= PHY_HALTED
;
505 mutex_unlock(&phydev
->lock
);
509 * phy_interrupt - PHY interrupt handler
510 * @irq: interrupt line
511 * @phy_dat: phy_device pointer
513 * Description: When a PHY interrupt occurs, the handler disables
514 * interrupts, and schedules a work task to clear the interrupt.
516 static irqreturn_t
phy_interrupt(int irq
, void *phy_dat
)
518 struct phy_device
*phydev
= phy_dat
;
520 if (PHY_HALTED
== phydev
->state
)
521 return IRQ_NONE
; /* It can't be ours. */
523 /* The MDIO bus is not allowed to be written in interrupt
524 * context, so we need to disable the irq here. A work
525 * queue will write the PHY to disable and clear the
526 * interrupt, and then reenable the irq line. */
527 disable_irq_nosync(irq
);
528 atomic_inc(&phydev
->irq_disable
);
530 schedule_work(&phydev
->phy_queue
);
536 * phy_enable_interrupts - Enable the interrupts from the PHY side
537 * @phydev: target phy_device struct
539 static int phy_enable_interrupts(struct phy_device
*phydev
)
543 err
= phy_clear_interrupt(phydev
);
548 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
554 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
555 * @phydev: target phy_device struct
557 static int phy_disable_interrupts(struct phy_device
*phydev
)
561 /* Disable PHY interrupts */
562 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_DISABLED
);
567 /* Clear the interrupt */
568 err
= phy_clear_interrupt(phydev
);
582 * phy_start_interrupts - request and enable interrupts for a PHY device
583 * @phydev: target phy_device struct
585 * Description: Request the interrupt for the given PHY.
586 * If this fails, then we set irq to PHY_POLL.
587 * Otherwise, we enable the interrupts in the PHY.
588 * This should only be called with a valid IRQ number.
589 * Returns 0 on success or < 0 on error.
591 int phy_start_interrupts(struct phy_device
*phydev
)
595 INIT_WORK(&phydev
->phy_queue
, phy_change
);
597 atomic_set(&phydev
->irq_disable
, 0);
598 if (request_irq(phydev
->irq
, phy_interrupt
,
602 pr_warn("%s: Can't get IRQ %d (PHY)\n",
603 phydev
->bus
->name
, phydev
->irq
);
604 phydev
->irq
= PHY_POLL
;
608 err
= phy_enable_interrupts(phydev
);
612 EXPORT_SYMBOL(phy_start_interrupts
);
615 * phy_stop_interrupts - disable interrupts from a PHY device
616 * @phydev: target phy_device struct
618 int phy_stop_interrupts(struct phy_device
*phydev
)
622 err
= phy_disable_interrupts(phydev
);
627 free_irq(phydev
->irq
, phydev
);
630 * Cannot call flush_scheduled_work() here as desired because
631 * of rtnl_lock(), but we do not really care about what would
632 * be done, except from enable_irq(), so cancel any work
633 * possibly pending and take care of the matter below.
635 cancel_work_sync(&phydev
->phy_queue
);
637 * If work indeed has been cancelled, disable_irq() will have
638 * been left unbalanced from phy_interrupt() and enable_irq()
639 * has to be called so that other devices on the line work.
641 while (atomic_dec_return(&phydev
->irq_disable
) >= 0)
642 enable_irq(phydev
->irq
);
646 EXPORT_SYMBOL(phy_stop_interrupts
);
650 * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
651 * @work: work_struct that describes the work to be done
653 static void phy_change(struct work_struct
*work
)
656 struct phy_device
*phydev
=
657 container_of(work
, struct phy_device
, phy_queue
);
659 if (phydev
->drv
->did_interrupt
&&
660 !phydev
->drv
->did_interrupt(phydev
))
663 err
= phy_disable_interrupts(phydev
);
668 mutex_lock(&phydev
->lock
);
669 if ((PHY_RUNNING
== phydev
->state
) || (PHY_NOLINK
== phydev
->state
))
670 phydev
->state
= PHY_CHANGELINK
;
671 mutex_unlock(&phydev
->lock
);
673 atomic_dec(&phydev
->irq_disable
);
674 enable_irq(phydev
->irq
);
676 /* Reenable interrupts */
677 if (PHY_HALTED
!= phydev
->state
)
678 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
683 /* reschedule state queue work to run as soon as possible */
684 cancel_delayed_work_sync(&phydev
->state_queue
);
685 schedule_delayed_work(&phydev
->state_queue
, 0);
690 atomic_dec(&phydev
->irq_disable
);
691 enable_irq(phydev
->irq
);
695 disable_irq(phydev
->irq
);
696 atomic_inc(&phydev
->irq_disable
);
702 * phy_stop - Bring down the PHY link, and stop checking the status
703 * @phydev: target phy_device struct
705 void phy_stop(struct phy_device
*phydev
)
707 mutex_lock(&phydev
->lock
);
709 if (PHY_HALTED
== phydev
->state
)
712 if (phydev
->irq
!= PHY_POLL
) {
713 /* Disable PHY Interrupts */
714 phy_config_interrupt(phydev
, PHY_INTERRUPT_DISABLED
);
716 /* Clear any pending interrupts */
717 phy_clear_interrupt(phydev
);
720 phydev
->state
= PHY_HALTED
;
723 mutex_unlock(&phydev
->lock
);
726 * Cannot call flush_scheduled_work() here as desired because
727 * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
728 * will not reenable interrupts.
734 * phy_start - start or restart a PHY device
735 * @phydev: target phy_device struct
737 * Description: Indicates the attached device's readiness to
738 * handle PHY-related work. Used during startup to start the
739 * PHY, and after a call to phy_stop() to resume operation.
740 * Also used to indicate the MDIO bus has cleared an error
743 void phy_start(struct phy_device
*phydev
)
745 mutex_lock(&phydev
->lock
);
747 switch (phydev
->state
) {
749 phydev
->state
= PHY_PENDING
;
752 phydev
->state
= PHY_UP
;
755 phydev
->state
= PHY_RESUMING
;
759 mutex_unlock(&phydev
->lock
);
761 EXPORT_SYMBOL(phy_stop
);
762 EXPORT_SYMBOL(phy_start
);
765 * phy_state_machine - Handle the state machine
766 * @work: work_struct that describes the work to be done
768 void phy_state_machine(struct work_struct
*work
)
770 struct delayed_work
*dwork
= to_delayed_work(work
);
771 struct phy_device
*phydev
=
772 container_of(dwork
, struct phy_device
, state_queue
);
776 mutex_lock(&phydev
->lock
);
778 if (phydev
->adjust_state
)
779 phydev
->adjust_state(phydev
->attached_dev
);
781 switch(phydev
->state
) {
790 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
794 err
= phy_read_status(phydev
);
799 /* If the link is down, give up on
800 * negotiation for now */
802 phydev
->state
= PHY_NOLINK
;
803 netif_carrier_off(phydev
->attached_dev
);
804 phydev
->adjust_link(phydev
->attached_dev
);
808 /* Check if negotiation is done. Break
809 * if there's an error */
810 err
= phy_aneg_done(phydev
);
814 /* If AN is done, we're running */
816 phydev
->state
= PHY_RUNNING
;
817 netif_carrier_on(phydev
->attached_dev
);
818 phydev
->adjust_link(phydev
->attached_dev
);
820 } else if (0 == phydev
->link_timeout
--) {
824 /* If we have the magic_aneg bit,
826 if (phydev
->drv
->flags
& PHY_HAS_MAGICANEG
)
829 /* The timer expired, and we still
830 * don't have a setting, so we try
831 * forcing it until we find one that
832 * works, starting from the fastest speed,
833 * and working our way down */
834 idx
= phy_find_valid(0, phydev
->supported
);
836 phydev
->speed
= settings
[idx
].speed
;
837 phydev
->duplex
= settings
[idx
].duplex
;
839 phydev
->autoneg
= AUTONEG_DISABLE
;
841 pr_info("Trying %d/%s\n",
843 DUPLEX_FULL
== phydev
->duplex
?
848 err
= phy_read_status(phydev
);
854 phydev
->state
= PHY_RUNNING
;
855 netif_carrier_on(phydev
->attached_dev
);
856 phydev
->adjust_link(phydev
->attached_dev
);
860 err
= genphy_update_link(phydev
);
866 phydev
->state
= PHY_RUNNING
;
867 netif_carrier_on(phydev
->attached_dev
);
869 if (0 == phydev
->link_timeout
--) {
870 phy_force_reduction(phydev
);
875 phydev
->adjust_link(phydev
->attached_dev
);
878 /* Only register a CHANGE if we are
880 if (PHY_POLL
== phydev
->irq
)
881 phydev
->state
= PHY_CHANGELINK
;
884 err
= phy_read_status(phydev
);
890 phydev
->state
= PHY_RUNNING
;
891 netif_carrier_on(phydev
->attached_dev
);
893 phydev
->state
= PHY_NOLINK
;
894 netif_carrier_off(phydev
->attached_dev
);
897 phydev
->adjust_link(phydev
->attached_dev
);
899 if (PHY_POLL
!= phydev
->irq
)
900 err
= phy_config_interrupt(phydev
,
901 PHY_INTERRUPT_ENABLED
);
906 netif_carrier_off(phydev
->attached_dev
);
907 phydev
->adjust_link(phydev
->attached_dev
);
912 err
= phy_clear_interrupt(phydev
);
917 err
= phy_config_interrupt(phydev
,
918 PHY_INTERRUPT_ENABLED
);
923 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
924 err
= phy_aneg_done(phydev
);
928 /* err > 0 if AN is done.
929 * Otherwise, it's 0, and we're
930 * still waiting for AN */
932 err
= phy_read_status(phydev
);
937 phydev
->state
= PHY_RUNNING
;
938 netif_carrier_on(phydev
->attached_dev
);
940 phydev
->state
= PHY_NOLINK
;
941 phydev
->adjust_link(phydev
->attached_dev
);
943 phydev
->state
= PHY_AN
;
944 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
947 err
= phy_read_status(phydev
);
952 phydev
->state
= PHY_RUNNING
;
953 netif_carrier_on(phydev
->attached_dev
);
955 phydev
->state
= PHY_NOLINK
;
956 phydev
->adjust_link(phydev
->attached_dev
);
961 mutex_unlock(&phydev
->lock
);
964 err
= phy_start_aneg(phydev
);
969 schedule_delayed_work(&phydev
->state_queue
, PHY_STATE_TIME
* HZ
);
972 static inline void mmd_phy_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
975 /* Write the desired MMD Devad */
976 bus
->write(bus
, addr
, MII_MMD_CTRL
, devad
);
978 /* Write the desired MMD register address */
979 bus
->write(bus
, addr
, MII_MMD_DATA
, prtad
);
981 /* Select the Function : DATA with no post increment */
982 bus
->write(bus
, addr
, MII_MMD_CTRL
, (devad
| MII_MMD_CTRL_NOINCR
));
986 * phy_read_mmd_indirect - reads data from the MMD registers
987 * @bus: the target MII bus
988 * @prtad: MMD Address
990 * @addr: PHY address on the MII bus
992 * Description: it reads data from the MMD registers (clause 22 to access to
993 * clause 45) of the specified phy address.
994 * To read these register we have:
995 * 1) Write reg 13 // DEVAD
996 * 2) Write reg 14 // MMD Address
997 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
998 * 3) Read reg 14 // Read MMD data
1000 static int phy_read_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
1005 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
1007 /* Read the content of the MMD's selected register */
1008 ret
= bus
->read(bus
, addr
, MII_MMD_DATA
);
1014 * phy_write_mmd_indirect - writes data to the MMD registers
1015 * @bus: the target MII bus
1016 * @prtad: MMD Address
1018 * @addr: PHY address on the MII bus
1019 * @data: data to write in the MMD register
1021 * Description: Write data from the MMD registers of the specified
1023 * To write these register we have:
1024 * 1) Write reg 13 // DEVAD
1025 * 2) Write reg 14 // MMD Address
1026 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1027 * 3) Write reg 14 // Write MMD data
1029 static void phy_write_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
1032 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
1034 /* Write the data into MMD's selected register */
1035 bus
->write(bus
, addr
, MII_MMD_DATA
, data
);
1038 static u32
phy_eee_to_adv(u16 eee_adv
)
1042 if (eee_adv
& MDIO_EEE_100TX
)
1043 adv
|= ADVERTISED_100baseT_Full
;
1044 if (eee_adv
& MDIO_EEE_1000T
)
1045 adv
|= ADVERTISED_1000baseT_Full
;
1046 if (eee_adv
& MDIO_EEE_10GT
)
1047 adv
|= ADVERTISED_10000baseT_Full
;
1048 if (eee_adv
& MDIO_EEE_1000KX
)
1049 adv
|= ADVERTISED_1000baseKX_Full
;
1050 if (eee_adv
& MDIO_EEE_10GKX4
)
1051 adv
|= ADVERTISED_10000baseKX4_Full
;
1052 if (eee_adv
& MDIO_EEE_10GKR
)
1053 adv
|= ADVERTISED_10000baseKR_Full
;
1058 static u32
phy_eee_to_supported(u16 eee_caported
)
1062 if (eee_caported
& MDIO_EEE_100TX
)
1063 supported
|= SUPPORTED_100baseT_Full
;
1064 if (eee_caported
& MDIO_EEE_1000T
)
1065 supported
|= SUPPORTED_1000baseT_Full
;
1066 if (eee_caported
& MDIO_EEE_10GT
)
1067 supported
|= SUPPORTED_10000baseT_Full
;
1068 if (eee_caported
& MDIO_EEE_1000KX
)
1069 supported
|= SUPPORTED_1000baseKX_Full
;
1070 if (eee_caported
& MDIO_EEE_10GKX4
)
1071 supported
|= SUPPORTED_10000baseKX4_Full
;
1072 if (eee_caported
& MDIO_EEE_10GKR
)
1073 supported
|= SUPPORTED_10000baseKR_Full
;
1078 static u16
phy_adv_to_eee(u32 adv
)
1082 if (adv
& ADVERTISED_100baseT_Full
)
1083 reg
|= MDIO_EEE_100TX
;
1084 if (adv
& ADVERTISED_1000baseT_Full
)
1085 reg
|= MDIO_EEE_1000T
;
1086 if (adv
& ADVERTISED_10000baseT_Full
)
1087 reg
|= MDIO_EEE_10GT
;
1088 if (adv
& ADVERTISED_1000baseKX_Full
)
1089 reg
|= MDIO_EEE_1000KX
;
1090 if (adv
& ADVERTISED_10000baseKX4_Full
)
1091 reg
|= MDIO_EEE_10GKX4
;
1092 if (adv
& ADVERTISED_10000baseKR_Full
)
1093 reg
|= MDIO_EEE_10GKR
;
1099 * phy_init_eee - init and check the EEE feature
1100 * @phydev: target phy_device struct
1101 * @clk_stop_enable: PHY may stop the clock during LPI
1103 * Description: it checks if the Energy-Efficient Ethernet (EEE)
1104 * is supported by looking at the MMD registers 3.20 and 7.60/61
1105 * and it programs the MMD register 3.0 setting the "Clock stop enable"
1108 int phy_init_eee(struct phy_device
*phydev
, bool clk_stop_enable
)
1110 int ret
= -EPROTONOSUPPORT
;
1112 /* According to 802.3az,the EEE is supported only in full duplex-mode.
1113 * Also EEE feature is active when core is operating with MII, GMII
1116 if ((phydev
->duplex
== DUPLEX_FULL
) &&
1117 ((phydev
->interface
== PHY_INTERFACE_MODE_MII
) ||
1118 (phydev
->interface
== PHY_INTERFACE_MODE_GMII
) ||
1119 (phydev
->interface
== PHY_INTERFACE_MODE_RGMII
))) {
1120 int eee_lp
, eee_cap
, eee_adv
;
1124 /* Read phy status to properly get the right settings */
1125 status
= phy_read_status(phydev
);
1129 /* First check if the EEE ability is supported */
1130 eee_cap
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
1131 MDIO_MMD_PCS
, phydev
->addr
);
1135 cap
= phy_eee_to_supported(eee_cap
);
1139 /* Check which link settings negotiated and verify it in
1140 * the EEE advertising registers.
1142 eee_lp
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1143 MDIO_MMD_AN
, phydev
->addr
);
1147 eee_adv
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1148 MDIO_MMD_AN
, phydev
->addr
);
1152 adv
= phy_eee_to_adv(eee_adv
);
1153 lp
= phy_eee_to_adv(eee_lp
);
1154 idx
= phy_find_setting(phydev
->speed
, phydev
->duplex
);
1155 if ((lp
& adv
& settings
[idx
].setting
))
1158 if (clk_stop_enable
) {
1159 /* Configure the PHY to stop receiving xMII
1160 * clock while it is signaling LPI.
1162 int val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1168 val
|= MDIO_PCS_CTRL1_CLKSTOP_EN
;
1169 phy_write_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1170 MDIO_MMD_PCS
, phydev
->addr
, val
);
1173 ret
= 0; /* EEE supported */
1179 EXPORT_SYMBOL(phy_init_eee
);
1182 * phy_get_eee_err - report the EEE wake error count
1183 * @phydev: target phy_device struct
1185 * Description: it is to report the number of time where the PHY
1186 * failed to complete its normal wake sequence.
1188 int phy_get_eee_err(struct phy_device
*phydev
)
1190 return phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_WK_ERR
,
1191 MDIO_MMD_PCS
, phydev
->addr
);
1194 EXPORT_SYMBOL(phy_get_eee_err
);
1197 * phy_ethtool_get_eee - get EEE supported and status
1198 * @phydev: target phy_device struct
1199 * @data: ethtool_eee data
1201 * Description: it reportes the Supported/Advertisement/LP Advertisement
1204 int phy_ethtool_get_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1208 /* Get Supported EEE */
1209 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
1210 MDIO_MMD_PCS
, phydev
->addr
);
1213 data
->supported
= phy_eee_to_supported(val
);
1215 /* Get advertisement EEE */
1216 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1217 MDIO_MMD_AN
, phydev
->addr
);
1220 data
->advertised
= phy_eee_to_adv(val
);
1222 /* Get LP advertisement EEE */
1223 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1224 MDIO_MMD_AN
, phydev
->addr
);
1227 data
->lp_advertised
= phy_eee_to_adv(val
);
1231 EXPORT_SYMBOL(phy_ethtool_get_eee
);
1234 * phy_ethtool_set_eee - set EEE supported and status
1235 * @phydev: target phy_device struct
1236 * @data: ethtool_eee data
1238 * Description: it is to program the Advertisement EEE register.
1240 int phy_ethtool_set_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1244 val
= phy_adv_to_eee(data
->advertised
);
1245 phy_write_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
, MDIO_MMD_AN
,
1250 EXPORT_SYMBOL(phy_ethtool_set_eee
);