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/delay.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/skbuff.h>
28 #include <linux/module.h>
29 #include <linux/mii.h>
30 #include <linux/ethtool.h>
31 #include <linux/phy.h>
32 #include <linux/timer.h>
33 #include <linux/workqueue.h>
34 #include <linux/mdio.h>
36 #include <linux/uaccess.h>
37 #include <linux/atomic.h>
41 static const char *phy_speed_to_str(int speed
)
57 return "Unsupported (update phy.c)";
62 * phy_print_status - Convenience function to print out the current phy status
63 * @phydev: the phy_device struct
65 void phy_print_status(struct phy_device
*phydev
)
68 netdev_info(phydev
->attached_dev
,
69 "Link is Up - %s/%s - flow control %s\n",
70 phy_speed_to_str(phydev
->speed
),
71 DUPLEX_FULL
== phydev
->duplex
? "Full" : "Half",
72 phydev
->pause
? "rx/tx" : "off");
74 netdev_info(phydev
->attached_dev
, "Link is Down\n");
77 EXPORT_SYMBOL(phy_print_status
);
80 * phy_clear_interrupt - Ack the phy device's interrupt
81 * @phydev: the phy_device struct
83 * If the @phydev driver has an ack_interrupt function, call it to
84 * ack and clear the phy device's interrupt.
86 * Returns 0 on success or < 0 on error.
88 static int phy_clear_interrupt(struct phy_device
*phydev
)
90 if (phydev
->drv
->ack_interrupt
)
91 return phydev
->drv
->ack_interrupt(phydev
);
97 * phy_config_interrupt - configure the PHY device for the requested interrupts
98 * @phydev: the phy_device struct
99 * @interrupts: interrupt flags to configure for this @phydev
101 * Returns 0 on success or < 0 on error.
103 static int phy_config_interrupt(struct phy_device
*phydev
, u32 interrupts
)
105 phydev
->interrupts
= interrupts
;
106 if (phydev
->drv
->config_intr
)
107 return phydev
->drv
->config_intr(phydev
);
114 * phy_aneg_done - return auto-negotiation status
115 * @phydev: target phy_device struct
117 * Description: Return the auto-negotiation status from this @phydev
118 * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
121 static inline int phy_aneg_done(struct phy_device
*phydev
)
123 if (phydev
->drv
->aneg_done
)
124 return phydev
->drv
->aneg_done(phydev
);
126 return genphy_aneg_done(phydev
);
129 /* A structure for mapping a particular speed and duplex
130 * combination to a particular SUPPORTED and ADVERTISED value
138 /* A mapping of all SUPPORTED settings to speed/duplex */
139 static const struct phy_setting settings
[] = {
142 .duplex
= DUPLEX_FULL
,
143 .setting
= SUPPORTED_10000baseT_Full
,
147 .duplex
= DUPLEX_FULL
,
148 .setting
= SUPPORTED_1000baseT_Full
,
152 .duplex
= DUPLEX_HALF
,
153 .setting
= SUPPORTED_1000baseT_Half
,
157 .duplex
= DUPLEX_FULL
,
158 .setting
= SUPPORTED_100baseT_Full
,
162 .duplex
= DUPLEX_HALF
,
163 .setting
= SUPPORTED_100baseT_Half
,
167 .duplex
= DUPLEX_FULL
,
168 .setting
= SUPPORTED_10baseT_Full
,
172 .duplex
= DUPLEX_HALF
,
173 .setting
= SUPPORTED_10baseT_Half
,
177 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
180 * phy_find_setting - find a PHY settings array entry that matches speed & duplex
181 * @speed: speed to match
182 * @duplex: duplex to match
184 * Description: Searches the settings array for the setting which
185 * matches the desired speed and duplex, and returns the index
186 * of that setting. Returns the index of the last setting if
187 * none of the others match.
189 static inline unsigned int phy_find_setting(int speed
, int duplex
)
191 unsigned int idx
= 0;
193 while (idx
< ARRAY_SIZE(settings
) &&
194 (settings
[idx
].speed
!= speed
|| settings
[idx
].duplex
!= duplex
))
197 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
201 * phy_find_valid - find a PHY setting that matches the requested features mask
202 * @idx: The first index in settings[] to search
203 * @features: A mask of the valid settings
205 * Description: Returns the index of the first valid setting less
206 * than or equal to the one pointed to by idx, as determined by
207 * the mask in features. Returns the index of the last setting
208 * if nothing else matches.
210 static inline unsigned int phy_find_valid(unsigned int idx
, u32 features
)
212 while (idx
< MAX_NUM_SETTINGS
&& !(settings
[idx
].setting
& features
))
215 return idx
< MAX_NUM_SETTINGS
? idx
: MAX_NUM_SETTINGS
- 1;
219 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
220 * @phydev: the target phy_device struct
222 * Description: Make sure the PHY is set to supported speeds and
223 * duplexes. Drop down by one in this order: 1000/FULL,
224 * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
226 static void phy_sanitize_settings(struct phy_device
*phydev
)
228 u32 features
= phydev
->supported
;
231 /* Sanitize settings based on PHY capabilities */
232 if ((features
& SUPPORTED_Autoneg
) == 0)
233 phydev
->autoneg
= AUTONEG_DISABLE
;
235 idx
= phy_find_valid(phy_find_setting(phydev
->speed
, phydev
->duplex
),
238 phydev
->speed
= settings
[idx
].speed
;
239 phydev
->duplex
= settings
[idx
].duplex
;
243 * phy_ethtool_sset - generic ethtool sset function, handles all the details
244 * @phydev: target phy_device struct
247 * A few notes about parameter checking:
248 * - We don't set port or transceiver, so we don't care what they
250 * - phy_start_aneg() will make sure forced settings are sane, and
251 * choose the next best ones from the ones selected, so we don't
252 * care if ethtool tries to give us bad values.
254 int phy_ethtool_sset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
256 u32 speed
= ethtool_cmd_speed(cmd
);
258 if (cmd
->phy_address
!= phydev
->addr
)
261 /* We make sure that we don't pass unsupported values in to the PHY */
262 cmd
->advertising
&= phydev
->supported
;
264 /* Verify the settings we care about. */
265 if (cmd
->autoneg
!= AUTONEG_ENABLE
&& cmd
->autoneg
!= AUTONEG_DISABLE
)
268 if (cmd
->autoneg
== AUTONEG_ENABLE
&& cmd
->advertising
== 0)
271 if (cmd
->autoneg
== AUTONEG_DISABLE
&&
272 ((speed
!= SPEED_1000
&&
273 speed
!= SPEED_100
&&
274 speed
!= SPEED_10
) ||
275 (cmd
->duplex
!= DUPLEX_HALF
&&
276 cmd
->duplex
!= DUPLEX_FULL
)))
279 phydev
->autoneg
= cmd
->autoneg
;
281 phydev
->speed
= speed
;
283 phydev
->advertising
= cmd
->advertising
;
285 if (AUTONEG_ENABLE
== cmd
->autoneg
)
286 phydev
->advertising
|= ADVERTISED_Autoneg
;
288 phydev
->advertising
&= ~ADVERTISED_Autoneg
;
290 phydev
->duplex
= cmd
->duplex
;
292 /* Restart the PHY */
293 phy_start_aneg(phydev
);
297 EXPORT_SYMBOL(phy_ethtool_sset
);
299 int phy_ethtool_gset(struct phy_device
*phydev
, struct ethtool_cmd
*cmd
)
301 cmd
->supported
= phydev
->supported
;
303 cmd
->advertising
= phydev
->advertising
;
304 cmd
->lp_advertising
= phydev
->lp_advertising
;
306 ethtool_cmd_speed_set(cmd
, phydev
->speed
);
307 cmd
->duplex
= phydev
->duplex
;
308 if (phydev
->interface
== PHY_INTERFACE_MODE_MOCA
)
309 cmd
->port
= PORT_BNC
;
311 cmd
->port
= PORT_MII
;
312 cmd
->phy_address
= phydev
->addr
;
313 cmd
->transceiver
= phy_is_internal(phydev
) ?
314 XCVR_INTERNAL
: XCVR_EXTERNAL
;
315 cmd
->autoneg
= phydev
->autoneg
;
319 EXPORT_SYMBOL(phy_ethtool_gset
);
322 * phy_mii_ioctl - generic PHY MII ioctl interface
323 * @phydev: the phy_device struct
324 * @ifr: &struct ifreq for socket ioctl's
325 * @cmd: ioctl cmd to execute
327 * Note that this function is currently incompatible with the
328 * PHYCONTROL layer. It changes registers without regard to
329 * current state. Use at own risk.
331 int phy_mii_ioctl(struct phy_device
*phydev
, struct ifreq
*ifr
, int cmd
)
333 struct mii_ioctl_data
*mii_data
= if_mii(ifr
);
334 u16 val
= mii_data
->val_in
;
338 mii_data
->phy_id
= phydev
->addr
;
342 mii_data
->val_out
= mdiobus_read(phydev
->bus
, mii_data
->phy_id
,
347 if (mii_data
->phy_id
== phydev
->addr
) {
348 switch (mii_data
->reg_num
) {
350 if ((val
& (BMCR_RESET
| BMCR_ANENABLE
)) == 0)
351 phydev
->autoneg
= AUTONEG_DISABLE
;
353 phydev
->autoneg
= AUTONEG_ENABLE
;
354 if (!phydev
->autoneg
&& (val
& BMCR_FULLDPLX
))
355 phydev
->duplex
= DUPLEX_FULL
;
357 phydev
->duplex
= DUPLEX_HALF
;
358 if (!phydev
->autoneg
&& (val
& BMCR_SPEED1000
))
359 phydev
->speed
= SPEED_1000
;
360 else if (!phydev
->autoneg
&&
361 (val
& BMCR_SPEED100
))
362 phydev
->speed
= SPEED_100
;
365 phydev
->advertising
= val
;
373 mdiobus_write(phydev
->bus
, mii_data
->phy_id
,
374 mii_data
->reg_num
, val
);
376 if (mii_data
->reg_num
== MII_BMCR
&&
378 return phy_init_hw(phydev
);
382 if (phydev
->drv
->hwtstamp
)
383 return phydev
->drv
->hwtstamp(phydev
, ifr
);
390 EXPORT_SYMBOL(phy_mii_ioctl
);
393 * phy_start_aneg - start auto-negotiation for this PHY device
394 * @phydev: the phy_device struct
396 * Description: Sanitizes the settings (if we're not autonegotiating
397 * them), and then calls the driver's config_aneg function.
398 * If the PHYCONTROL Layer is operating, we change the state to
399 * reflect the beginning of Auto-negotiation or forcing.
401 int phy_start_aneg(struct phy_device
*phydev
)
405 mutex_lock(&phydev
->lock
);
407 if (AUTONEG_DISABLE
== phydev
->autoneg
)
408 phy_sanitize_settings(phydev
);
410 err
= phydev
->drv
->config_aneg(phydev
);
414 if (phydev
->state
!= PHY_HALTED
) {
415 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
416 phydev
->state
= PHY_AN
;
417 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
419 phydev
->state
= PHY_FORCING
;
420 phydev
->link_timeout
= PHY_FORCE_TIMEOUT
;
425 mutex_unlock(&phydev
->lock
);
428 EXPORT_SYMBOL(phy_start_aneg
);
431 * phy_start_machine - start PHY state machine tracking
432 * @phydev: the phy_device struct
434 * Description: The PHY infrastructure can run a state machine
435 * which tracks whether the PHY is starting up, negotiating,
436 * etc. This function starts the timer which tracks the state
437 * of the PHY. If you want to maintain your own state machine,
438 * do not call this function.
440 void phy_start_machine(struct phy_device
*phydev
)
442 queue_delayed_work(system_power_efficient_wq
, &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
);
464 * phy_error - enter HALTED state for this PHY device
465 * @phydev: target phy_device struct
467 * Moves the PHY to the HALTED state in response to a read
468 * or write error, and tells the controller the link is down.
469 * Must not be called from interrupt context, or while the
470 * phydev->lock is held.
472 static void phy_error(struct phy_device
*phydev
)
474 mutex_lock(&phydev
->lock
);
475 phydev
->state
= PHY_HALTED
;
476 mutex_unlock(&phydev
->lock
);
480 * phy_interrupt - PHY interrupt handler
481 * @irq: interrupt line
482 * @phy_dat: phy_device pointer
484 * Description: When a PHY interrupt occurs, the handler disables
485 * interrupts, and schedules a work task to clear the interrupt.
487 static irqreturn_t
phy_interrupt(int irq
, void *phy_dat
)
489 struct phy_device
*phydev
= phy_dat
;
491 if (PHY_HALTED
== phydev
->state
)
492 return IRQ_NONE
; /* It can't be ours. */
494 /* The MDIO bus is not allowed to be written in interrupt
495 * context, so we need to disable the irq here. A work
496 * queue will write the PHY to disable and clear the
497 * interrupt, and then reenable the irq line.
499 disable_irq_nosync(irq
);
500 atomic_inc(&phydev
->irq_disable
);
502 queue_work(system_power_efficient_wq
, &phydev
->phy_queue
);
508 * phy_enable_interrupts - Enable the interrupts from the PHY side
509 * @phydev: target phy_device struct
511 static int phy_enable_interrupts(struct phy_device
*phydev
)
513 int err
= phy_clear_interrupt(phydev
);
518 return phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
522 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
523 * @phydev: target phy_device struct
525 static int phy_disable_interrupts(struct phy_device
*phydev
)
529 /* Disable PHY interrupts */
530 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_DISABLED
);
534 /* Clear the interrupt */
535 err
= phy_clear_interrupt(phydev
);
548 * phy_start_interrupts - request and enable interrupts for a PHY device
549 * @phydev: target phy_device struct
551 * Description: Request the interrupt for the given PHY.
552 * If this fails, then we set irq to PHY_POLL.
553 * Otherwise, we enable the interrupts in the PHY.
554 * This should only be called with a valid IRQ number.
555 * Returns 0 on success or < 0 on error.
557 int phy_start_interrupts(struct phy_device
*phydev
)
559 atomic_set(&phydev
->irq_disable
, 0);
560 if (request_irq(phydev
->irq
, phy_interrupt
, 0, "phy_interrupt",
562 pr_warn("%s: Can't get IRQ %d (PHY)\n",
563 phydev
->bus
->name
, phydev
->irq
);
564 phydev
->irq
= PHY_POLL
;
568 return phy_enable_interrupts(phydev
);
570 EXPORT_SYMBOL(phy_start_interrupts
);
573 * phy_stop_interrupts - disable interrupts from a PHY device
574 * @phydev: target phy_device struct
576 int phy_stop_interrupts(struct phy_device
*phydev
)
578 int err
= phy_disable_interrupts(phydev
);
583 free_irq(phydev
->irq
, phydev
);
585 /* Cannot call flush_scheduled_work() here as desired because
586 * of rtnl_lock(), but we do not really care about what would
587 * be done, except from enable_irq(), so cancel any work
588 * possibly pending and take care of the matter below.
590 cancel_work_sync(&phydev
->phy_queue
);
591 /* If work indeed has been cancelled, disable_irq() will have
592 * been left unbalanced from phy_interrupt() and enable_irq()
593 * has to be called so that other devices on the line work.
595 while (atomic_dec_return(&phydev
->irq_disable
) >= 0)
596 enable_irq(phydev
->irq
);
600 EXPORT_SYMBOL(phy_stop_interrupts
);
603 * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
604 * @work: work_struct that describes the work to be done
606 void phy_change(struct work_struct
*work
)
608 struct phy_device
*phydev
=
609 container_of(work
, struct phy_device
, phy_queue
);
611 if (phydev
->drv
->did_interrupt
&&
612 !phydev
->drv
->did_interrupt(phydev
))
615 if (phy_disable_interrupts(phydev
))
618 mutex_lock(&phydev
->lock
);
619 if ((PHY_RUNNING
== phydev
->state
) || (PHY_NOLINK
== phydev
->state
))
620 phydev
->state
= PHY_CHANGELINK
;
621 mutex_unlock(&phydev
->lock
);
623 atomic_dec(&phydev
->irq_disable
);
624 enable_irq(phydev
->irq
);
626 /* Reenable interrupts */
627 if (PHY_HALTED
!= phydev
->state
&&
628 phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
))
631 /* reschedule state queue work to run as soon as possible */
632 cancel_delayed_work_sync(&phydev
->state_queue
);
633 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
);
680 * phy_start - start or restart a PHY device
681 * @phydev: target phy_device struct
683 * Description: Indicates the attached device's readiness to
684 * handle PHY-related work. Used during startup to start the
685 * PHY, and after a call to phy_stop() to resume operation.
686 * Also used to indicate the MDIO bus has cleared an error
689 void phy_start(struct phy_device
*phydev
)
691 mutex_lock(&phydev
->lock
);
693 switch (phydev
->state
) {
695 phydev
->state
= PHY_PENDING
;
698 phydev
->state
= PHY_UP
;
701 phydev
->state
= PHY_RESUMING
;
705 mutex_unlock(&phydev
->lock
);
707 EXPORT_SYMBOL(phy_start
);
710 * phy_state_machine - Handle the state machine
711 * @work: work_struct that describes the work to be done
713 void phy_state_machine(struct work_struct
*work
)
715 struct delayed_work
*dwork
= to_delayed_work(work
);
716 struct phy_device
*phydev
=
717 container_of(dwork
, struct phy_device
, state_queue
);
718 int needs_aneg
= 0, do_suspend
= 0;
721 mutex_lock(&phydev
->lock
);
723 switch (phydev
->state
) {
732 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
736 err
= phy_read_status(phydev
);
740 /* If the link is down, give up on negotiation for now */
742 phydev
->state
= PHY_NOLINK
;
743 netif_carrier_off(phydev
->attached_dev
);
744 phydev
->adjust_link(phydev
->attached_dev
);
748 /* Check if negotiation is done. Break if there's an error */
749 err
= phy_aneg_done(phydev
);
753 /* If AN is done, we're running */
755 phydev
->state
= PHY_RUNNING
;
756 netif_carrier_on(phydev
->attached_dev
);
757 phydev
->adjust_link(phydev
->attached_dev
);
759 } else if (0 == phydev
->link_timeout
--) {
761 /* If we have the magic_aneg bit, we try again */
762 if (phydev
->drv
->flags
& PHY_HAS_MAGICANEG
)
767 err
= phy_read_status(phydev
);
772 phydev
->state
= PHY_RUNNING
;
773 netif_carrier_on(phydev
->attached_dev
);
774 phydev
->adjust_link(phydev
->attached_dev
);
778 err
= genphy_update_link(phydev
);
783 phydev
->state
= PHY_RUNNING
;
784 netif_carrier_on(phydev
->attached_dev
);
786 if (0 == phydev
->link_timeout
--)
790 phydev
->adjust_link(phydev
->attached_dev
);
793 /* Only register a CHANGE if we are
794 * polling or ignoring interrupts
796 if (!phy_interrupt_is_valid(phydev
))
797 phydev
->state
= PHY_CHANGELINK
;
800 err
= phy_read_status(phydev
);
805 phydev
->state
= PHY_RUNNING
;
806 netif_carrier_on(phydev
->attached_dev
);
808 phydev
->state
= PHY_NOLINK
;
809 netif_carrier_off(phydev
->attached_dev
);
812 phydev
->adjust_link(phydev
->attached_dev
);
814 if (phy_interrupt_is_valid(phydev
))
815 err
= phy_config_interrupt(phydev
,
816 PHY_INTERRUPT_ENABLED
);
821 netif_carrier_off(phydev
->attached_dev
);
822 phydev
->adjust_link(phydev
->attached_dev
);
827 err
= phy_clear_interrupt(phydev
);
831 err
= phy_config_interrupt(phydev
, PHY_INTERRUPT_ENABLED
);
835 if (AUTONEG_ENABLE
== phydev
->autoneg
) {
836 err
= phy_aneg_done(phydev
);
840 /* err > 0 if AN is done.
841 * Otherwise, it's 0, and we're still waiting for AN
844 err
= phy_read_status(phydev
);
849 phydev
->state
= PHY_RUNNING
;
850 netif_carrier_on(phydev
->attached_dev
);
852 phydev
->state
= PHY_NOLINK
;
854 phydev
->adjust_link(phydev
->attached_dev
);
856 phydev
->state
= PHY_AN
;
857 phydev
->link_timeout
= PHY_AN_TIMEOUT
;
860 err
= phy_read_status(phydev
);
865 phydev
->state
= PHY_RUNNING
;
866 netif_carrier_on(phydev
->attached_dev
);
868 phydev
->state
= PHY_NOLINK
;
870 phydev
->adjust_link(phydev
->attached_dev
);
875 mutex_unlock(&phydev
->lock
);
878 err
= phy_start_aneg(phydev
);
886 queue_delayed_work(system_power_efficient_wq
, &phydev
->state_queue
,
887 PHY_STATE_TIME
* HZ
);
890 void phy_mac_interrupt(struct phy_device
*phydev
, int new_link
)
892 cancel_work_sync(&phydev
->phy_queue
);
893 phydev
->link
= new_link
;
894 schedule_work(&phydev
->phy_queue
);
896 EXPORT_SYMBOL(phy_mac_interrupt
);
898 static inline void mmd_phy_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
901 /* Write the desired MMD Devad */
902 bus
->write(bus
, addr
, MII_MMD_CTRL
, devad
);
904 /* Write the desired MMD register address */
905 bus
->write(bus
, addr
, MII_MMD_DATA
, prtad
);
907 /* Select the Function : DATA with no post increment */
908 bus
->write(bus
, addr
, MII_MMD_CTRL
, (devad
| MII_MMD_CTRL_NOINCR
));
912 * phy_read_mmd_indirect - reads data from the MMD registers
913 * @bus: the target MII bus
914 * @prtad: MMD Address
916 * @addr: PHY address on the MII bus
918 * Description: it reads data from the MMD registers (clause 22 to access to
919 * clause 45) of the specified phy address.
920 * To read these register we have:
921 * 1) Write reg 13 // DEVAD
922 * 2) Write reg 14 // MMD Address
923 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
924 * 3) Read reg 14 // Read MMD data
926 static int phy_read_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
929 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
931 /* Read the content of the MMD's selected register */
932 return bus
->read(bus
, addr
, MII_MMD_DATA
);
936 * phy_write_mmd_indirect - writes data to the MMD registers
937 * @bus: the target MII bus
938 * @prtad: MMD Address
940 * @addr: PHY address on the MII bus
941 * @data: data to write in the MMD register
943 * Description: Write data from the MMD registers of the specified
945 * To write these register we have:
946 * 1) Write reg 13 // DEVAD
947 * 2) Write reg 14 // MMD Address
948 * 3) Write reg 13 // MMD Data Command for MMD DEVAD
949 * 3) Write reg 14 // Write MMD data
951 static void phy_write_mmd_indirect(struct mii_bus
*bus
, int prtad
, int devad
,
954 mmd_phy_indirect(bus
, prtad
, devad
, addr
);
956 /* Write the data into MMD's selected register */
957 bus
->write(bus
, addr
, MII_MMD_DATA
, data
);
961 * phy_init_eee - init and check the EEE feature
962 * @phydev: target phy_device struct
963 * @clk_stop_enable: PHY may stop the clock during LPI
965 * Description: it checks if the Energy-Efficient Ethernet (EEE)
966 * is supported by looking at the MMD registers 3.20 and 7.60/61
967 * and it programs the MMD register 3.0 setting the "Clock stop enable"
970 int phy_init_eee(struct phy_device
*phydev
, bool clk_stop_enable
)
972 /* According to 802.3az,the EEE is supported only in full duplex-mode.
973 * Also EEE feature is active when core is operating with MII, GMII
976 if ((phydev
->duplex
== DUPLEX_FULL
) &&
977 ((phydev
->interface
== PHY_INTERFACE_MODE_MII
) ||
978 (phydev
->interface
== PHY_INTERFACE_MODE_GMII
) ||
979 (phydev
->interface
== PHY_INTERFACE_MODE_RGMII
))) {
980 int eee_lp
, eee_cap
, eee_adv
;
985 /* Read phy status to properly get the right settings */
986 status
= phy_read_status(phydev
);
990 /* First check if the EEE ability is supported */
991 eee_cap
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
992 MDIO_MMD_PCS
, phydev
->addr
);
996 cap
= mmd_eee_cap_to_ethtool_sup_t(eee_cap
);
998 return -EPROTONOSUPPORT
;
1000 /* Check which link settings negotiated and verify it in
1001 * the EEE advertising registers.
1003 eee_lp
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1004 MDIO_MMD_AN
, phydev
->addr
);
1008 eee_adv
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1009 MDIO_MMD_AN
, phydev
->addr
);
1013 adv
= mmd_eee_adv_to_ethtool_adv_t(eee_adv
);
1014 lp
= mmd_eee_adv_to_ethtool_adv_t(eee_lp
);
1015 idx
= phy_find_setting(phydev
->speed
, phydev
->duplex
);
1016 if (!(lp
& adv
& settings
[idx
].setting
))
1017 return -EPROTONOSUPPORT
;
1019 if (clk_stop_enable
) {
1020 /* Configure the PHY to stop receiving xMII
1021 * clock while it is signaling LPI.
1023 int val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1029 val
|= MDIO_PCS_CTRL1_CLKSTOP_EN
;
1030 phy_write_mmd_indirect(phydev
->bus
, MDIO_CTRL1
,
1031 MDIO_MMD_PCS
, phydev
->addr
, val
);
1034 return 0; /* EEE supported */
1037 return -EPROTONOSUPPORT
;
1039 EXPORT_SYMBOL(phy_init_eee
);
1042 * phy_get_eee_err - report the EEE wake error count
1043 * @phydev: target phy_device struct
1045 * Description: it is to report the number of time where the PHY
1046 * failed to complete its normal wake sequence.
1048 int phy_get_eee_err(struct phy_device
*phydev
)
1050 return phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_WK_ERR
,
1051 MDIO_MMD_PCS
, phydev
->addr
);
1053 EXPORT_SYMBOL(phy_get_eee_err
);
1056 * phy_ethtool_get_eee - get EEE supported and status
1057 * @phydev: target phy_device struct
1058 * @data: ethtool_eee data
1060 * Description: it reportes the Supported/Advertisement/LP Advertisement
1063 int phy_ethtool_get_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1067 /* Get Supported EEE */
1068 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_PCS_EEE_ABLE
,
1069 MDIO_MMD_PCS
, phydev
->addr
);
1072 data
->supported
= mmd_eee_cap_to_ethtool_sup_t(val
);
1074 /* Get advertisement EEE */
1075 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
,
1076 MDIO_MMD_AN
, phydev
->addr
);
1079 data
->advertised
= mmd_eee_adv_to_ethtool_adv_t(val
);
1081 /* Get LP advertisement EEE */
1082 val
= phy_read_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_LPABLE
,
1083 MDIO_MMD_AN
, phydev
->addr
);
1086 data
->lp_advertised
= mmd_eee_adv_to_ethtool_adv_t(val
);
1090 EXPORT_SYMBOL(phy_ethtool_get_eee
);
1093 * phy_ethtool_set_eee - set EEE supported and status
1094 * @phydev: target phy_device struct
1095 * @data: ethtool_eee data
1097 * Description: it is to program the Advertisement EEE register.
1099 int phy_ethtool_set_eee(struct phy_device
*phydev
, struct ethtool_eee
*data
)
1101 int val
= ethtool_adv_to_mmd_eee_adv_t(data
->advertised
);
1103 phy_write_mmd_indirect(phydev
->bus
, MDIO_AN_EEE_ADV
, MDIO_MMD_AN
,
1108 EXPORT_SYMBOL(phy_ethtool_set_eee
);
1110 int phy_ethtool_set_wol(struct phy_device
*phydev
, struct ethtool_wolinfo
*wol
)
1112 if (phydev
->drv
->set_wol
)
1113 return phydev
->drv
->set_wol(phydev
, wol
);
1117 EXPORT_SYMBOL(phy_ethtool_set_wol
);
1119 void phy_ethtool_get_wol(struct phy_device
*phydev
, struct ethtool_wolinfo
*wol
)
1121 if (phydev
->drv
->get_wol
)
1122 phydev
->drv
->get_wol(phydev
, wol
);
1124 EXPORT_SYMBOL(phy_ethtool_get_wol
);