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1/*
2 * drivers/net/phy/phy.c
3 *
4 * Framework for configuring and reading PHY devices
5 * Based on code in sungem_phy.c and gianfar_phy.c
6 *
7 * Author: Andy Fleming
8 *
9 * Copyright (c) 2004 Freescale Semiconductor, Inc.
10 * Copyright (c) 2006, 2007 Maciej W. Rozycki
11 *
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.
16 *
17 */
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>
28#include <linux/mm.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
36#include <linux/atomic.h>
37#include <asm/io.h>
38#include <asm/irq.h>
39#include <asm/uaccess.h>
40
41/**
42 * phy_print_status - Convenience function to print out the current phy status
43 * @phydev: the phy_device struct
44 */
45void phy_print_status(struct phy_device *phydev)
46{
47 pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev),
48 phydev->link ? "Up" : "Down");
49 if (phydev->link)
50 printk(KERN_CONT " - %d/%s", phydev->speed,
51 DUPLEX_FULL == phydev->duplex ?
52 "Full" : "Half");
53
54 printk(KERN_CONT "\n");
55}
56EXPORT_SYMBOL(phy_print_status);
57
58
59/**
60 * phy_clear_interrupt - Ack the phy device's interrupt
61 * @phydev: the phy_device struct
62 *
63 * If the @phydev driver has an ack_interrupt function, call it to
64 * ack and clear the phy device's interrupt.
65 *
66 * Returns 0 on success on < 0 on error.
67 */
68static int phy_clear_interrupt(struct phy_device *phydev)
69{
70 int err = 0;
71
72 if (phydev->drv->ack_interrupt)
73 err = phydev->drv->ack_interrupt(phydev);
74
75 return err;
76}
77
78/**
79 * phy_config_interrupt - configure the PHY device for the requested interrupts
80 * @phydev: the phy_device struct
81 * @interrupts: interrupt flags to configure for this @phydev
82 *
83 * Returns 0 on success on < 0 on error.
84 */
85static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
86{
87 int err = 0;
88
89 phydev->interrupts = interrupts;
90 if (phydev->drv->config_intr)
91 err = phydev->drv->config_intr(phydev);
92
93 return err;
94}
95
96
97/**
98 * phy_aneg_done - return auto-negotiation status
99 * @phydev: target phy_device struct
100 *
101 * Description: Reads the status register and returns 0 either if
102 * auto-negotiation is incomplete, or if there was an error.
103 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
104 */
105static inline int phy_aneg_done(struct phy_device *phydev)
106{
107 int retval;
108
109 retval = phy_read(phydev, MII_BMSR);
110
111 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
112}
113
114/* A structure for mapping a particular speed and duplex
115 * combination to a particular SUPPORTED and ADVERTISED value */
116struct phy_setting {
117 int speed;
118 int duplex;
119 u32 setting;
120};
121
122/* A mapping of all SUPPORTED settings to speed/duplex */
123static const struct phy_setting settings[] = {
124 {
125 .speed = 10000,
126 .duplex = DUPLEX_FULL,
127 .setting = SUPPORTED_10000baseT_Full,
128 },
129 {
130 .speed = SPEED_1000,
131 .duplex = DUPLEX_FULL,
132 .setting = SUPPORTED_1000baseT_Full,
133 },
134 {
135 .speed = SPEED_1000,
136 .duplex = DUPLEX_HALF,
137 .setting = SUPPORTED_1000baseT_Half,
138 },
139 {
140 .speed = SPEED_100,
141 .duplex = DUPLEX_FULL,
142 .setting = SUPPORTED_100baseT_Full,
143 },
144 {
145 .speed = SPEED_100,
146 .duplex = DUPLEX_HALF,
147 .setting = SUPPORTED_100baseT_Half,
148 },
149 {
150 .speed = SPEED_10,
151 .duplex = DUPLEX_FULL,
152 .setting = SUPPORTED_10baseT_Full,
153 },
154 {
155 .speed = SPEED_10,
156 .duplex = DUPLEX_HALF,
157 .setting = SUPPORTED_10baseT_Half,
158 },
159};
160
161#define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
162
163/**
164 * phy_find_setting - find a PHY settings array entry that matches speed & duplex
165 * @speed: speed to match
166 * @duplex: duplex to match
167 *
168 * Description: Searches the settings array for the setting which
169 * matches the desired speed and duplex, and returns the index
170 * of that setting. Returns the index of the last setting if
171 * none of the others match.
172 */
173static inline int phy_find_setting(int speed, int duplex)
174{
175 int idx = 0;
176
177 while (idx < ARRAY_SIZE(settings) &&
178 (settings[idx].speed != speed ||
179 settings[idx].duplex != duplex))
180 idx++;
181
182 return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
183}
184
185/**
186 * phy_find_valid - find a PHY setting that matches the requested features mask
187 * @idx: The first index in settings[] to search
188 * @features: A mask of the valid settings
189 *
190 * Description: Returns the index of the first valid setting less
191 * than or equal to the one pointed to by idx, as determined by
192 * the mask in features. Returns the index of the last setting
193 * if nothing else matches.
194 */
195static inline int phy_find_valid(int idx, u32 features)
196{
197 while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
198 idx++;
199
200 return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
201}
202
203/**
204 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
205 * @phydev: the target phy_device struct
206 *
207 * Description: Make sure the PHY is set to supported speeds and
208 * duplexes. Drop down by one in this order: 1000/FULL,
209 * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
210 */
211static void phy_sanitize_settings(struct phy_device *phydev)
212{
213 u32 features = phydev->supported;
214 int idx;
215
216 /* Sanitize settings based on PHY capabilities */
217 if ((features & SUPPORTED_Autoneg) == 0)
218 phydev->autoneg = AUTONEG_DISABLE;
219
220 idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
221 features);
222
223 phydev->speed = settings[idx].speed;
224 phydev->duplex = settings[idx].duplex;
225}
226
227/**
228 * phy_ethtool_sset - generic ethtool sset function, handles all the details
229 * @phydev: target phy_device struct
230 * @cmd: ethtool_cmd
231 *
232 * A few notes about parameter checking:
233 * - We don't set port or transceiver, so we don't care what they
234 * were set to.
235 * - phy_start_aneg() will make sure forced settings are sane, and
236 * choose the next best ones from the ones selected, so we don't
237 * care if ethtool tries to give us bad values.
238 */
239int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
240{
241 u32 speed = ethtool_cmd_speed(cmd);
242
243 if (cmd->phy_address != phydev->addr)
244 return -EINVAL;
245
246 /* We make sure that we don't pass unsupported
247 * values in to the PHY */
248 cmd->advertising &= phydev->supported;
249
250 /* Verify the settings we care about. */
251 if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
252 return -EINVAL;
253
254 if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
255 return -EINVAL;
256
257 if (cmd->autoneg == AUTONEG_DISABLE &&
258 ((speed != SPEED_1000 &&
259 speed != SPEED_100 &&
260 speed != SPEED_10) ||
261 (cmd->duplex != DUPLEX_HALF &&
262 cmd->duplex != DUPLEX_FULL)))
263 return -EINVAL;
264
265 phydev->autoneg = cmd->autoneg;
266
267 phydev->speed = speed;
268
269 phydev->advertising = cmd->advertising;
270
271 if (AUTONEG_ENABLE == cmd->autoneg)
272 phydev->advertising |= ADVERTISED_Autoneg;
273 else
274 phydev->advertising &= ~ADVERTISED_Autoneg;
275
276 phydev->duplex = cmd->duplex;
277
278 /* Restart the PHY */
279 phy_start_aneg(phydev);
280
281 return 0;
282}
283EXPORT_SYMBOL(phy_ethtool_sset);
284
285int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
286{
287 cmd->supported = phydev->supported;
288
289 cmd->advertising = phydev->advertising;
290
291 ethtool_cmd_speed_set(cmd, phydev->speed);
292 cmd->duplex = phydev->duplex;
293 cmd->port = PORT_MII;
294 cmd->phy_address = phydev->addr;
295 cmd->transceiver = XCVR_EXTERNAL;
296 cmd->autoneg = phydev->autoneg;
297
298 return 0;
299}
300EXPORT_SYMBOL(phy_ethtool_gset);
301
302/**
303 * phy_mii_ioctl - generic PHY MII ioctl interface
304 * @phydev: the phy_device struct
305 * @ifr: &struct ifreq for socket ioctl's
306 * @cmd: ioctl cmd to execute
307 *
308 * Note that this function is currently incompatible with the
309 * PHYCONTROL layer. It changes registers without regard to
310 * current state. Use at own risk.
311 */
312int phy_mii_ioctl(struct phy_device *phydev,
313 struct ifreq *ifr, int cmd)
314{
315 struct mii_ioctl_data *mii_data = if_mii(ifr);
316 u16 val = mii_data->val_in;
317
318 switch (cmd) {
319 case SIOCGMIIPHY:
320 mii_data->phy_id = phydev->addr;
321 /* fall through */
322
323 case SIOCGMIIREG:
324 mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id,
325 mii_data->reg_num);
326 break;
327
328 case SIOCSMIIREG:
329 if (mii_data->phy_id == phydev->addr) {
330 switch(mii_data->reg_num) {
331 case MII_BMCR:
332 if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
333 phydev->autoneg = AUTONEG_DISABLE;
334 else
335 phydev->autoneg = AUTONEG_ENABLE;
336 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
337 phydev->duplex = DUPLEX_FULL;
338 else
339 phydev->duplex = DUPLEX_HALF;
340 if ((!phydev->autoneg) &&
341 (val & BMCR_SPEED1000))
342 phydev->speed = SPEED_1000;
343 else if ((!phydev->autoneg) &&
344 (val & BMCR_SPEED100))
345 phydev->speed = SPEED_100;
346 break;
347 case MII_ADVERTISE:
348 phydev->advertising = val;
349 break;
350 default:
351 /* do nothing */
352 break;
353 }
354 }
355
356 mdiobus_write(phydev->bus, mii_data->phy_id,
357 mii_data->reg_num, val);
358
359 if (mii_data->reg_num == MII_BMCR &&
360 val & BMCR_RESET &&
361 phydev->drv->config_init) {
362 phy_scan_fixups(phydev);
363 phydev->drv->config_init(phydev);
364 }
365 break;
366
367 case SIOCSHWTSTAMP:
368 if (phydev->drv->hwtstamp)
369 return phydev->drv->hwtstamp(phydev, ifr);
370 /* fall through */
371
372 default:
373 return -EOPNOTSUPP;
374 }
375
376 return 0;
377}
378EXPORT_SYMBOL(phy_mii_ioctl);
379
380/**
381 * phy_start_aneg - start auto-negotiation for this PHY device
382 * @phydev: the phy_device struct
383 *
384 * Description: Sanitizes the settings (if we're not autonegotiating
385 * them), and then calls the driver's config_aneg function.
386 * If the PHYCONTROL Layer is operating, we change the state to
387 * reflect the beginning of Auto-negotiation or forcing.
388 */
389int phy_start_aneg(struct phy_device *phydev)
390{
391 int err;
392
393 mutex_lock(&phydev->lock);
394
395 if (AUTONEG_DISABLE == phydev->autoneg)
396 phy_sanitize_settings(phydev);
397
398 err = phydev->drv->config_aneg(phydev);
399
400 if (err < 0)
401 goto out_unlock;
402
403 if (phydev->state != PHY_HALTED) {
404 if (AUTONEG_ENABLE == phydev->autoneg) {
405 phydev->state = PHY_AN;
406 phydev->link_timeout = PHY_AN_TIMEOUT;
407 } else {
408 phydev->state = PHY_FORCING;
409 phydev->link_timeout = PHY_FORCE_TIMEOUT;
410 }
411 }
412
413out_unlock:
414 mutex_unlock(&phydev->lock);
415 return err;
416}
417EXPORT_SYMBOL(phy_start_aneg);
418
419
420static void phy_change(struct work_struct *work);
421
422/**
423 * phy_start_machine - start PHY state machine tracking
424 * @phydev: the phy_device struct
425 * @handler: callback function for state change notifications
426 *
427 * Description: The PHY infrastructure can run a state machine
428 * which tracks whether the PHY is starting up, negotiating,
429 * etc. This function starts the timer which tracks the state
430 * of the PHY. If you want to be notified when the state changes,
431 * pass in the callback @handler, otherwise, pass NULL. If you
432 * want to maintain your own state machine, do not call this
433 * function.
434 */
435void phy_start_machine(struct phy_device *phydev,
436 void (*handler)(struct net_device *))
437{
438 phydev->adjust_state = handler;
439
440 schedule_delayed_work(&phydev->state_queue, HZ);
441}
442
443/**
444 * phy_stop_machine - stop the PHY state machine tracking
445 * @phydev: target phy_device struct
446 *
447 * Description: Stops the state machine timer, sets the state to UP
448 * (unless it wasn't up yet). This function must be called BEFORE
449 * phy_detach.
450 */
451void phy_stop_machine(struct phy_device *phydev)
452{
453 cancel_delayed_work_sync(&phydev->state_queue);
454
455 mutex_lock(&phydev->lock);
456 if (phydev->state > PHY_UP)
457 phydev->state = PHY_UP;
458 mutex_unlock(&phydev->lock);
459
460 phydev->adjust_state = NULL;
461}
462
463/**
464 * phy_force_reduction - reduce PHY speed/duplex settings by one step
465 * @phydev: target phy_device struct
466 *
467 * Description: Reduces the speed/duplex settings by one notch,
468 * in this order--
469 * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
470 * The function bottoms out at 10/HALF.
471 */
472static void phy_force_reduction(struct phy_device *phydev)
473{
474 int idx;
475
476 idx = phy_find_setting(phydev->speed, phydev->duplex);
477
478 idx++;
479
480 idx = phy_find_valid(idx, phydev->supported);
481
482 phydev->speed = settings[idx].speed;
483 phydev->duplex = settings[idx].duplex;
484
485 pr_info("Trying %d/%s\n", phydev->speed,
486 DUPLEX_FULL == phydev->duplex ?
487 "FULL" : "HALF");
488}
489
490
491/**
492 * phy_error - enter HALTED state for this PHY device
493 * @phydev: target phy_device struct
494 *
495 * Moves the PHY to the HALTED state in response to a read
496 * or write error, and tells the controller the link is down.
497 * Must not be called from interrupt context, or while the
498 * phydev->lock is held.
499 */
500static void phy_error(struct phy_device *phydev)
501{
502 mutex_lock(&phydev->lock);
503 phydev->state = PHY_HALTED;
504 mutex_unlock(&phydev->lock);
505}
506
507/**
508 * phy_interrupt - PHY interrupt handler
509 * @irq: interrupt line
510 * @phy_dat: phy_device pointer
511 *
512 * Description: When a PHY interrupt occurs, the handler disables
513 * interrupts, and schedules a work task to clear the interrupt.
514 */
515static irqreturn_t phy_interrupt(int irq, void *phy_dat)
516{
517 struct phy_device *phydev = phy_dat;
518
519 if (PHY_HALTED == phydev->state)
520 return IRQ_NONE; /* It can't be ours. */
521
522 /* The MDIO bus is not allowed to be written in interrupt
523 * context, so we need to disable the irq here. A work
524 * queue will write the PHY to disable and clear the
525 * interrupt, and then reenable the irq line. */
526 disable_irq_nosync(irq);
527 atomic_inc(&phydev->irq_disable);
528
529 schedule_work(&phydev->phy_queue);
530
531 return IRQ_HANDLED;
532}
533
534/**
535 * phy_enable_interrupts - Enable the interrupts from the PHY side
536 * @phydev: target phy_device struct
537 */
538static int phy_enable_interrupts(struct phy_device *phydev)
539{
540 int err;
541
542 err = phy_clear_interrupt(phydev);
543
544 if (err < 0)
545 return err;
546
547 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
548
549 return err;
550}
551
552/**
553 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
554 * @phydev: target phy_device struct
555 */
556static int phy_disable_interrupts(struct phy_device *phydev)
557{
558 int err;
559
560 /* Disable PHY interrupts */
561 err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
562
563 if (err)
564 goto phy_err;
565
566 /* Clear the interrupt */
567 err = phy_clear_interrupt(phydev);
568
569 if (err)
570 goto phy_err;
571
572 return 0;
573
574phy_err:
575 phy_error(phydev);
576
577 return err;
578}
579
580/**
581 * phy_start_interrupts - request and enable interrupts for a PHY device
582 * @phydev: target phy_device struct
583 *
584 * Description: Request the interrupt for the given PHY.
585 * If this fails, then we set irq to PHY_POLL.
586 * Otherwise, we enable the interrupts in the PHY.
587 * This should only be called with a valid IRQ number.
588 * Returns 0 on success or < 0 on error.
589 */
590int phy_start_interrupts(struct phy_device *phydev)
591{
592 int err = 0;
593
594 INIT_WORK(&phydev->phy_queue, phy_change);
595
596 atomic_set(&phydev->irq_disable, 0);
597 if (request_irq(phydev->irq, phy_interrupt,
598 IRQF_SHARED,
599 "phy_interrupt",
600 phydev) < 0) {
601 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
602 phydev->bus->name,
603 phydev->irq);
604 phydev->irq = PHY_POLL;
605 return 0;
606 }
607
608 err = phy_enable_interrupts(phydev);
609
610 return err;
611}
612EXPORT_SYMBOL(phy_start_interrupts);
613
614/**
615 * phy_stop_interrupts - disable interrupts from a PHY device
616 * @phydev: target phy_device struct
617 */
618int phy_stop_interrupts(struct phy_device *phydev)
619{
620 int err;
621
622 err = phy_disable_interrupts(phydev);
623
624 if (err)
625 phy_error(phydev);
626
627 free_irq(phydev->irq, phydev);
628
629 /*
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.
634 */
635 cancel_work_sync(&phydev->phy_queue);
636 /*
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.
640 */
641 while (atomic_dec_return(&phydev->irq_disable) >= 0)
642 enable_irq(phydev->irq);
643
644 return err;
645}
646EXPORT_SYMBOL(phy_stop_interrupts);
647
648
649/**
650 * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
651 * @work: work_struct that describes the work to be done
652 */
653static void phy_change(struct work_struct *work)
654{
655 int err;
656 struct phy_device *phydev =
657 container_of(work, struct phy_device, phy_queue);
658
659 if (phydev->drv->did_interrupt &&
660 !phydev->drv->did_interrupt(phydev))
661 goto ignore;
662
663 err = phy_disable_interrupts(phydev);
664
665 if (err)
666 goto phy_err;
667
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);
672
673 atomic_dec(&phydev->irq_disable);
674 enable_irq(phydev->irq);
675
676 /* Reenable interrupts */
677 if (PHY_HALTED != phydev->state)
678 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
679
680 if (err)
681 goto irq_enable_err;
682
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);
686
687 return;
688
689ignore:
690 atomic_dec(&phydev->irq_disable);
691 enable_irq(phydev->irq);
692 return;
693
694irq_enable_err:
695 disable_irq(phydev->irq);
696 atomic_inc(&phydev->irq_disable);
697phy_err:
698 phy_error(phydev);
699}
700
701/**
702 * phy_stop - Bring down the PHY link, and stop checking the status
703 * @phydev: target phy_device struct
704 */
705void phy_stop(struct phy_device *phydev)
706{
707 mutex_lock(&phydev->lock);
708
709 if (PHY_HALTED == phydev->state)
710 goto out_unlock;
711
712 if (phydev->irq != PHY_POLL) {
713 /* Disable PHY Interrupts */
714 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
715
716 /* Clear any pending interrupts */
717 phy_clear_interrupt(phydev);
718 }
719
720 phydev->state = PHY_HALTED;
721
722out_unlock:
723 mutex_unlock(&phydev->lock);
724
725 /*
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.
729 */
730}
731
732
733/**
734 * phy_start - start or restart a PHY device
735 * @phydev: target phy_device struct
736 *
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
741 * condition.
742 */
743void phy_start(struct phy_device *phydev)
744{
745 mutex_lock(&phydev->lock);
746
747 switch (phydev->state) {
748 case PHY_STARTING:
749 phydev->state = PHY_PENDING;
750 break;
751 case PHY_READY:
752 phydev->state = PHY_UP;
753 break;
754 case PHY_HALTED:
755 phydev->state = PHY_RESUMING;
756 default:
757 break;
758 }
759 mutex_unlock(&phydev->lock);
760}
761EXPORT_SYMBOL(phy_stop);
762EXPORT_SYMBOL(phy_start);
763
764/**
765 * phy_state_machine - Handle the state machine
766 * @work: work_struct that describes the work to be done
767 */
768void phy_state_machine(struct work_struct *work)
769{
770 struct delayed_work *dwork = to_delayed_work(work);
771 struct phy_device *phydev =
772 container_of(dwork, struct phy_device, state_queue);
773 int needs_aneg = 0;
774 int err = 0;
775
776 mutex_lock(&phydev->lock);
777
778 if (phydev->adjust_state)
779 phydev->adjust_state(phydev->attached_dev);
780
781 switch(phydev->state) {
782 case PHY_DOWN:
783 case PHY_STARTING:
784 case PHY_READY:
785 case PHY_PENDING:
786 break;
787 case PHY_UP:
788 needs_aneg = 1;
789
790 phydev->link_timeout = PHY_AN_TIMEOUT;
791
792 break;
793 case PHY_AN:
794 err = phy_read_status(phydev);
795
796 if (err < 0)
797 break;
798
799 /* If the link is down, give up on
800 * negotiation for now */
801 if (!phydev->link) {
802 phydev->state = PHY_NOLINK;
803 netif_carrier_off(phydev->attached_dev);
804 phydev->adjust_link(phydev->attached_dev);
805 break;
806 }
807
808 /* Check if negotiation is done. Break
809 * if there's an error */
810 err = phy_aneg_done(phydev);
811 if (err < 0)
812 break;
813
814 /* If AN is done, we're running */
815 if (err > 0) {
816 phydev->state = PHY_RUNNING;
817 netif_carrier_on(phydev->attached_dev);
818 phydev->adjust_link(phydev->attached_dev);
819
820 } else if (0 == phydev->link_timeout--) {
821 int idx;
822
823 needs_aneg = 1;
824 /* If we have the magic_aneg bit,
825 * we try again */
826 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
827 break;
828
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);
835
836 phydev->speed = settings[idx].speed;
837 phydev->duplex = settings[idx].duplex;
838
839 phydev->autoneg = AUTONEG_DISABLE;
840
841 pr_info("Trying %d/%s\n", phydev->speed,
842 DUPLEX_FULL ==
843 phydev->duplex ?
844 "FULL" : "HALF");
845 }
846 break;
847 case PHY_NOLINK:
848 err = phy_read_status(phydev);
849
850 if (err)
851 break;
852
853 if (phydev->link) {
854 phydev->state = PHY_RUNNING;
855 netif_carrier_on(phydev->attached_dev);
856 phydev->adjust_link(phydev->attached_dev);
857 }
858 break;
859 case PHY_FORCING:
860 err = genphy_update_link(phydev);
861
862 if (err)
863 break;
864
865 if (phydev->link) {
866 phydev->state = PHY_RUNNING;
867 netif_carrier_on(phydev->attached_dev);
868 } else {
869 if (0 == phydev->link_timeout--) {
870 phy_force_reduction(phydev);
871 needs_aneg = 1;
872 }
873 }
874
875 phydev->adjust_link(phydev->attached_dev);
876 break;
877 case PHY_RUNNING:
878 /* Only register a CHANGE if we are
879 * polling */
880 if (PHY_POLL == phydev->irq)
881 phydev->state = PHY_CHANGELINK;
882 break;
883 case PHY_CHANGELINK:
884 err = phy_read_status(phydev);
885
886 if (err)
887 break;
888
889 if (phydev->link) {
890 phydev->state = PHY_RUNNING;
891 netif_carrier_on(phydev->attached_dev);
892 } else {
893 phydev->state = PHY_NOLINK;
894 netif_carrier_off(phydev->attached_dev);
895 }
896
897 phydev->adjust_link(phydev->attached_dev);
898
899 if (PHY_POLL != phydev->irq)
900 err = phy_config_interrupt(phydev,
901 PHY_INTERRUPT_ENABLED);
902 break;
903 case PHY_HALTED:
904 if (phydev->link) {
905 phydev->link = 0;
906 netif_carrier_off(phydev->attached_dev);
907 phydev->adjust_link(phydev->attached_dev);
908 }
909 break;
910 case PHY_RESUMING:
911
912 err = phy_clear_interrupt(phydev);
913
914 if (err)
915 break;
916
917 err = phy_config_interrupt(phydev,
918 PHY_INTERRUPT_ENABLED);
919
920 if (err)
921 break;
922
923 if (AUTONEG_ENABLE == phydev->autoneg) {
924 err = phy_aneg_done(phydev);
925 if (err < 0)
926 break;
927
928 /* err > 0 if AN is done.
929 * Otherwise, it's 0, and we're
930 * still waiting for AN */
931 if (err > 0) {
932 err = phy_read_status(phydev);
933 if (err)
934 break;
935
936 if (phydev->link) {
937 phydev->state = PHY_RUNNING;
938 netif_carrier_on(phydev->attached_dev);
939 } else
940 phydev->state = PHY_NOLINK;
941 phydev->adjust_link(phydev->attached_dev);
942 } else {
943 phydev->state = PHY_AN;
944 phydev->link_timeout = PHY_AN_TIMEOUT;
945 }
946 } else {
947 err = phy_read_status(phydev);
948 if (err)
949 break;
950
951 if (phydev->link) {
952 phydev->state = PHY_RUNNING;
953 netif_carrier_on(phydev->attached_dev);
954 } else
955 phydev->state = PHY_NOLINK;
956 phydev->adjust_link(phydev->attached_dev);
957 }
958 break;
959 }
960
961 mutex_unlock(&phydev->lock);
962
963 if (needs_aneg)
964 err = phy_start_aneg(phydev);
965
966 if (err < 0)
967 phy_error(phydev);
968
969 schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
970}
1// SPDX-License-Identifier: GPL-2.0+
2/* Framework for configuring and reading PHY devices
3 * Based on code in sungem_phy.c and gianfar_phy.c
4 *
5 * Author: Andy Fleming
6 *
7 * Copyright (c) 2004 Freescale Semiconductor, Inc.
8 * Copyright (c) 2006, 2007 Maciej W. Rozycki
9 */
10
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/errno.h>
14#include <linux/unistd.h>
15#include <linux/interrupt.h>
16#include <linux/delay.h>
17#include <linux/netdevice.h>
18#include <linux/netlink.h>
19#include <linux/etherdevice.h>
20#include <linux/skbuff.h>
21#include <linux/mm.h>
22#include <linux/module.h>
23#include <linux/mii.h>
24#include <linux/ethtool.h>
25#include <linux/ethtool_netlink.h>
26#include <linux/phy.h>
27#include <linux/phy_led_triggers.h>
28#include <linux/sfp.h>
29#include <linux/workqueue.h>
30#include <linux/mdio.h>
31#include <linux/io.h>
32#include <linux/uaccess.h>
33#include <linux/atomic.h>
34#include <linux/suspend.h>
35#include <net/netlink.h>
36#include <net/genetlink.h>
37#include <net/sock.h>
38
39#define PHY_STATE_TIME HZ
40
41#define PHY_STATE_STR(_state) \
42 case PHY_##_state: \
43 return __stringify(_state); \
44
45static const char *phy_state_to_str(enum phy_state st)
46{
47 switch (st) {
48 PHY_STATE_STR(DOWN)
49 PHY_STATE_STR(READY)
50 PHY_STATE_STR(UP)
51 PHY_STATE_STR(RUNNING)
52 PHY_STATE_STR(NOLINK)
53 PHY_STATE_STR(CABLETEST)
54 PHY_STATE_STR(HALTED)
55 PHY_STATE_STR(ERROR)
56 }
57
58 return NULL;
59}
60
61static void phy_process_state_change(struct phy_device *phydev,
62 enum phy_state old_state)
63{
64 if (old_state != phydev->state) {
65 phydev_dbg(phydev, "PHY state change %s -> %s\n",
66 phy_state_to_str(old_state),
67 phy_state_to_str(phydev->state));
68 if (phydev->drv && phydev->drv->link_change_notify)
69 phydev->drv->link_change_notify(phydev);
70 }
71}
72
73static void phy_link_up(struct phy_device *phydev)
74{
75 phydev->phy_link_change(phydev, true);
76 phy_led_trigger_change_speed(phydev);
77}
78
79static void phy_link_down(struct phy_device *phydev)
80{
81 phydev->phy_link_change(phydev, false);
82 phy_led_trigger_change_speed(phydev);
83 WRITE_ONCE(phydev->link_down_events, phydev->link_down_events + 1);
84}
85
86static const char *phy_pause_str(struct phy_device *phydev)
87{
88 bool local_pause, local_asym_pause;
89
90 if (phydev->autoneg == AUTONEG_DISABLE)
91 goto no_pause;
92
93 local_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
94 phydev->advertising);
95 local_asym_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
96 phydev->advertising);
97
98 if (local_pause && phydev->pause)
99 return "rx/tx";
100
101 if (local_asym_pause && phydev->asym_pause) {
102 if (local_pause)
103 return "rx";
104 if (phydev->pause)
105 return "tx";
106 }
107
108no_pause:
109 return "off";
110}
111
112/**
113 * phy_print_status - Convenience function to print out the current phy status
114 * @phydev: the phy_device struct
115 */
116void phy_print_status(struct phy_device *phydev)
117{
118 if (phydev->link) {
119 netdev_info(phydev->attached_dev,
120 "Link is Up - %s/%s %s- flow control %s\n",
121 phy_speed_to_str(phydev->speed),
122 phy_duplex_to_str(phydev->duplex),
123 phydev->downshifted_rate ? "(downshifted) " : "",
124 phy_pause_str(phydev));
125 } else {
126 netdev_info(phydev->attached_dev, "Link is Down\n");
127 }
128}
129EXPORT_SYMBOL(phy_print_status);
130
131/**
132 * phy_get_rate_matching - determine if rate matching is supported
133 * @phydev: The phy device to return rate matching for
134 * @iface: The interface mode to use
135 *
136 * This determines the type of rate matching (if any) that @phy supports
137 * using @iface. @iface may be %PHY_INTERFACE_MODE_NA to determine if any
138 * interface supports rate matching.
139 *
140 * Return: The type of rate matching @phy supports for @iface, or
141 * %RATE_MATCH_NONE.
142 */
143int phy_get_rate_matching(struct phy_device *phydev,
144 phy_interface_t iface)
145{
146 int ret = RATE_MATCH_NONE;
147
148 if (phydev->drv->get_rate_matching) {
149 mutex_lock(&phydev->lock);
150 ret = phydev->drv->get_rate_matching(phydev, iface);
151 mutex_unlock(&phydev->lock);
152 }
153
154 return ret;
155}
156EXPORT_SYMBOL_GPL(phy_get_rate_matching);
157
158/**
159 * phy_config_interrupt - configure the PHY device for the requested interrupts
160 * @phydev: the phy_device struct
161 * @interrupts: interrupt flags to configure for this @phydev
162 *
163 * Returns 0 on success or < 0 on error.
164 */
165static int phy_config_interrupt(struct phy_device *phydev, bool interrupts)
166{
167 phydev->interrupts = interrupts ? 1 : 0;
168 if (phydev->drv->config_intr)
169 return phydev->drv->config_intr(phydev);
170
171 return 0;
172}
173
174/**
175 * phy_restart_aneg - restart auto-negotiation
176 * @phydev: target phy_device struct
177 *
178 * Restart the autonegotiation on @phydev. Returns >= 0 on success or
179 * negative errno on error.
180 */
181int phy_restart_aneg(struct phy_device *phydev)
182{
183 int ret;
184
185 if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
186 ret = genphy_c45_restart_aneg(phydev);
187 else
188 ret = genphy_restart_aneg(phydev);
189
190 return ret;
191}
192EXPORT_SYMBOL_GPL(phy_restart_aneg);
193
194/**
195 * phy_aneg_done - return auto-negotiation status
196 * @phydev: target phy_device struct
197 *
198 * Description: Return the auto-negotiation status from this @phydev
199 * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
200 * is still pending.
201 */
202int phy_aneg_done(struct phy_device *phydev)
203{
204 if (phydev->drv && phydev->drv->aneg_done)
205 return phydev->drv->aneg_done(phydev);
206 else if (phydev->is_c45)
207 return genphy_c45_aneg_done(phydev);
208 else
209 return genphy_aneg_done(phydev);
210}
211EXPORT_SYMBOL(phy_aneg_done);
212
213/**
214 * phy_find_valid - find a PHY setting that matches the requested parameters
215 * @speed: desired speed
216 * @duplex: desired duplex
217 * @supported: mask of supported link modes
218 *
219 * Locate a supported phy setting that is, in priority order:
220 * - an exact match for the specified speed and duplex mode
221 * - a match for the specified speed, or slower speed
222 * - the slowest supported speed
223 * Returns the matched phy_setting entry, or %NULL if no supported phy
224 * settings were found.
225 */
226static const struct phy_setting *
227phy_find_valid(int speed, int duplex, unsigned long *supported)
228{
229 return phy_lookup_setting(speed, duplex, supported, false);
230}
231
232/**
233 * phy_supported_speeds - return all speeds currently supported by a phy device
234 * @phy: The phy device to return supported speeds of.
235 * @speeds: buffer to store supported speeds in.
236 * @size: size of speeds buffer.
237 *
238 * Description: Returns the number of supported speeds, and fills the speeds
239 * buffer with the supported speeds. If speeds buffer is too small to contain
240 * all currently supported speeds, will return as many speeds as can fit.
241 */
242unsigned int phy_supported_speeds(struct phy_device *phy,
243 unsigned int *speeds,
244 unsigned int size)
245{
246 return phy_speeds(speeds, size, phy->supported);
247}
248
249/**
250 * phy_check_valid - check if there is a valid PHY setting which matches
251 * speed, duplex, and feature mask
252 * @speed: speed to match
253 * @duplex: duplex to match
254 * @features: A mask of the valid settings
255 *
256 * Description: Returns true if there is a valid setting, false otherwise.
257 */
258bool phy_check_valid(int speed, int duplex, unsigned long *features)
259{
260 return !!phy_lookup_setting(speed, duplex, features, true);
261}
262EXPORT_SYMBOL(phy_check_valid);
263
264/**
265 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
266 * @phydev: the target phy_device struct
267 *
268 * Description: Make sure the PHY is set to supported speeds and
269 * duplexes. Drop down by one in this order: 1000/FULL,
270 * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
271 */
272static void phy_sanitize_settings(struct phy_device *phydev)
273{
274 const struct phy_setting *setting;
275
276 setting = phy_find_valid(phydev->speed, phydev->duplex,
277 phydev->supported);
278 if (setting) {
279 phydev->speed = setting->speed;
280 phydev->duplex = setting->duplex;
281 } else {
282 /* We failed to find anything (no supported speeds?) */
283 phydev->speed = SPEED_UNKNOWN;
284 phydev->duplex = DUPLEX_UNKNOWN;
285 }
286}
287
288void phy_ethtool_ksettings_get(struct phy_device *phydev,
289 struct ethtool_link_ksettings *cmd)
290{
291 mutex_lock(&phydev->lock);
292 linkmode_copy(cmd->link_modes.supported, phydev->supported);
293 linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
294 linkmode_copy(cmd->link_modes.lp_advertising, phydev->lp_advertising);
295
296 cmd->base.speed = phydev->speed;
297 cmd->base.duplex = phydev->duplex;
298 cmd->base.master_slave_cfg = phydev->master_slave_get;
299 cmd->base.master_slave_state = phydev->master_slave_state;
300 cmd->base.rate_matching = phydev->rate_matching;
301 if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
302 cmd->base.port = PORT_BNC;
303 else
304 cmd->base.port = phydev->port;
305 cmd->base.transceiver = phy_is_internal(phydev) ?
306 XCVR_INTERNAL : XCVR_EXTERNAL;
307 cmd->base.phy_address = phydev->mdio.addr;
308 cmd->base.autoneg = phydev->autoneg;
309 cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
310 cmd->base.eth_tp_mdix = phydev->mdix;
311 mutex_unlock(&phydev->lock);
312}
313EXPORT_SYMBOL(phy_ethtool_ksettings_get);
314
315/**
316 * phy_mii_ioctl - generic PHY MII ioctl interface
317 * @phydev: the phy_device struct
318 * @ifr: &struct ifreq for socket ioctl's
319 * @cmd: ioctl cmd to execute
320 *
321 * Note that this function is currently incompatible with the
322 * PHYCONTROL layer. It changes registers without regard to
323 * current state. Use at own risk.
324 */
325int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
326{
327 struct mii_ioctl_data *mii_data = if_mii(ifr);
328 struct kernel_hwtstamp_config kernel_cfg;
329 struct netlink_ext_ack extack = {};
330 u16 val = mii_data->val_in;
331 bool change_autoneg = false;
332 struct hwtstamp_config cfg;
333 int prtad, devad;
334 int ret;
335
336 switch (cmd) {
337 case SIOCGMIIPHY:
338 mii_data->phy_id = phydev->mdio.addr;
339 fallthrough;
340
341 case SIOCGMIIREG:
342 if (mdio_phy_id_is_c45(mii_data->phy_id)) {
343 prtad = mdio_phy_id_prtad(mii_data->phy_id);
344 devad = mdio_phy_id_devad(mii_data->phy_id);
345 mii_data->val_out = mdiobus_c45_read(
346 phydev->mdio.bus, prtad, devad,
347 mii_data->reg_num);
348 } else {
349 mii_data->val_out = mdiobus_read(
350 phydev->mdio.bus, mii_data->phy_id,
351 mii_data->reg_num);
352 }
353 return 0;
354
355 case SIOCSMIIREG:
356 if (mdio_phy_id_is_c45(mii_data->phy_id)) {
357 prtad = mdio_phy_id_prtad(mii_data->phy_id);
358 devad = mdio_phy_id_devad(mii_data->phy_id);
359 } else {
360 prtad = mii_data->phy_id;
361 devad = mii_data->reg_num;
362 }
363 if (prtad == phydev->mdio.addr) {
364 switch (devad) {
365 case MII_BMCR:
366 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
367 if (phydev->autoneg == AUTONEG_ENABLE)
368 change_autoneg = true;
369 phydev->autoneg = AUTONEG_DISABLE;
370 if (val & BMCR_FULLDPLX)
371 phydev->duplex = DUPLEX_FULL;
372 else
373 phydev->duplex = DUPLEX_HALF;
374 if (val & BMCR_SPEED1000)
375 phydev->speed = SPEED_1000;
376 else if (val & BMCR_SPEED100)
377 phydev->speed = SPEED_100;
378 else phydev->speed = SPEED_10;
379 } else {
380 if (phydev->autoneg == AUTONEG_DISABLE)
381 change_autoneg = true;
382 phydev->autoneg = AUTONEG_ENABLE;
383 }
384 break;
385 case MII_ADVERTISE:
386 mii_adv_mod_linkmode_adv_t(phydev->advertising,
387 val);
388 change_autoneg = true;
389 break;
390 case MII_CTRL1000:
391 mii_ctrl1000_mod_linkmode_adv_t(phydev->advertising,
392 val);
393 change_autoneg = true;
394 break;
395 default:
396 /* do nothing */
397 break;
398 }
399 }
400
401 if (mdio_phy_id_is_c45(mii_data->phy_id))
402 mdiobus_c45_write(phydev->mdio.bus, prtad, devad,
403 mii_data->reg_num, val);
404 else
405 mdiobus_write(phydev->mdio.bus, prtad, devad, val);
406
407 if (prtad == phydev->mdio.addr &&
408 devad == MII_BMCR &&
409 val & BMCR_RESET)
410 return phy_init_hw(phydev);
411
412 if (change_autoneg)
413 return phy_start_aneg(phydev);
414
415 return 0;
416
417 case SIOCSHWTSTAMP:
418 if (phydev->mii_ts && phydev->mii_ts->hwtstamp) {
419 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
420 return -EFAULT;
421
422 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
423 ret = phydev->mii_ts->hwtstamp(phydev->mii_ts, &kernel_cfg, &extack);
424 if (ret)
425 return ret;
426
427 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
428 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
429 return -EFAULT;
430
431 return 0;
432 }
433 fallthrough;
434
435 default:
436 return -EOPNOTSUPP;
437 }
438}
439EXPORT_SYMBOL(phy_mii_ioctl);
440
441/**
442 * phy_do_ioctl - generic ndo_eth_ioctl implementation
443 * @dev: the net_device struct
444 * @ifr: &struct ifreq for socket ioctl's
445 * @cmd: ioctl cmd to execute
446 */
447int phy_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
448{
449 if (!dev->phydev)
450 return -ENODEV;
451
452 return phy_mii_ioctl(dev->phydev, ifr, cmd);
453}
454EXPORT_SYMBOL(phy_do_ioctl);
455
456/**
457 * phy_do_ioctl_running - generic ndo_eth_ioctl implementation but test first
458 *
459 * @dev: the net_device struct
460 * @ifr: &struct ifreq for socket ioctl's
461 * @cmd: ioctl cmd to execute
462 *
463 * Same as phy_do_ioctl, but ensures that net_device is running before
464 * handling the ioctl.
465 */
466int phy_do_ioctl_running(struct net_device *dev, struct ifreq *ifr, int cmd)
467{
468 if (!netif_running(dev))
469 return -ENODEV;
470
471 return phy_do_ioctl(dev, ifr, cmd);
472}
473EXPORT_SYMBOL(phy_do_ioctl_running);
474
475/**
476 * __phy_hwtstamp_get - Get hardware timestamping configuration from PHY
477 *
478 * @phydev: the PHY device structure
479 * @config: structure holding the timestamping configuration
480 *
481 * Query the PHY device for its current hardware timestamping configuration.
482 */
483int __phy_hwtstamp_get(struct phy_device *phydev,
484 struct kernel_hwtstamp_config *config)
485{
486 if (!phydev)
487 return -ENODEV;
488
489 return -EOPNOTSUPP;
490}
491
492/**
493 * __phy_hwtstamp_set - Modify PHY hardware timestamping configuration
494 *
495 * @phydev: the PHY device structure
496 * @config: structure holding the timestamping configuration
497 * @extack: netlink extended ack structure, for error reporting
498 */
499int __phy_hwtstamp_set(struct phy_device *phydev,
500 struct kernel_hwtstamp_config *config,
501 struct netlink_ext_ack *extack)
502{
503 if (!phydev)
504 return -ENODEV;
505
506 if (phydev->mii_ts && phydev->mii_ts->hwtstamp)
507 return phydev->mii_ts->hwtstamp(phydev->mii_ts, config, extack);
508
509 return -EOPNOTSUPP;
510}
511
512/**
513 * phy_queue_state_machine - Trigger the state machine to run soon
514 *
515 * @phydev: the phy_device struct
516 * @jiffies: Run the state machine after these jiffies
517 */
518void phy_queue_state_machine(struct phy_device *phydev, unsigned long jiffies)
519{
520 mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
521 jiffies);
522}
523EXPORT_SYMBOL(phy_queue_state_machine);
524
525/**
526 * phy_trigger_machine - Trigger the state machine to run now
527 *
528 * @phydev: the phy_device struct
529 */
530void phy_trigger_machine(struct phy_device *phydev)
531{
532 phy_queue_state_machine(phydev, 0);
533}
534EXPORT_SYMBOL(phy_trigger_machine);
535
536static void phy_abort_cable_test(struct phy_device *phydev)
537{
538 int err;
539
540 ethnl_cable_test_finished(phydev);
541
542 err = phy_init_hw(phydev);
543 if (err)
544 phydev_err(phydev, "Error while aborting cable test");
545}
546
547/**
548 * phy_ethtool_get_strings - Get the statistic counter names
549 *
550 * @phydev: the phy_device struct
551 * @data: Where to put the strings
552 */
553int phy_ethtool_get_strings(struct phy_device *phydev, u8 *data)
554{
555 if (!phydev->drv)
556 return -EIO;
557
558 mutex_lock(&phydev->lock);
559 phydev->drv->get_strings(phydev, data);
560 mutex_unlock(&phydev->lock);
561
562 return 0;
563}
564EXPORT_SYMBOL(phy_ethtool_get_strings);
565
566/**
567 * phy_ethtool_get_sset_count - Get the number of statistic counters
568 *
569 * @phydev: the phy_device struct
570 */
571int phy_ethtool_get_sset_count(struct phy_device *phydev)
572{
573 int ret;
574
575 if (!phydev->drv)
576 return -EIO;
577
578 if (phydev->drv->get_sset_count &&
579 phydev->drv->get_strings &&
580 phydev->drv->get_stats) {
581 mutex_lock(&phydev->lock);
582 ret = phydev->drv->get_sset_count(phydev);
583 mutex_unlock(&phydev->lock);
584
585 return ret;
586 }
587
588 return -EOPNOTSUPP;
589}
590EXPORT_SYMBOL(phy_ethtool_get_sset_count);
591
592/**
593 * phy_ethtool_get_stats - Get the statistic counters
594 *
595 * @phydev: the phy_device struct
596 * @stats: What counters to get
597 * @data: Where to store the counters
598 */
599int phy_ethtool_get_stats(struct phy_device *phydev,
600 struct ethtool_stats *stats, u64 *data)
601{
602 if (!phydev->drv)
603 return -EIO;
604
605 mutex_lock(&phydev->lock);
606 phydev->drv->get_stats(phydev, stats, data);
607 mutex_unlock(&phydev->lock);
608
609 return 0;
610}
611EXPORT_SYMBOL(phy_ethtool_get_stats);
612
613/**
614 * phy_ethtool_get_plca_cfg - Get PLCA RS configuration
615 * @phydev: the phy_device struct
616 * @plca_cfg: where to store the retrieved configuration
617 *
618 * Retrieve the PLCA configuration from the PHY. Return 0 on success or a
619 * negative value if an error occurred.
620 */
621int phy_ethtool_get_plca_cfg(struct phy_device *phydev,
622 struct phy_plca_cfg *plca_cfg)
623{
624 int ret;
625
626 if (!phydev->drv) {
627 ret = -EIO;
628 goto out;
629 }
630
631 if (!phydev->drv->get_plca_cfg) {
632 ret = -EOPNOTSUPP;
633 goto out;
634 }
635
636 mutex_lock(&phydev->lock);
637 ret = phydev->drv->get_plca_cfg(phydev, plca_cfg);
638
639 mutex_unlock(&phydev->lock);
640out:
641 return ret;
642}
643
644/**
645 * plca_check_valid - Check PLCA configuration before enabling
646 * @phydev: the phy_device struct
647 * @plca_cfg: current PLCA configuration
648 * @extack: extack for reporting useful error messages
649 *
650 * Checks whether the PLCA and PHY configuration are consistent and it is safe
651 * to enable PLCA. Returns 0 on success or a negative value if the PLCA or PHY
652 * configuration is not consistent.
653 */
654static int plca_check_valid(struct phy_device *phydev,
655 const struct phy_plca_cfg *plca_cfg,
656 struct netlink_ext_ack *extack)
657{
658 int ret = 0;
659
660 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT,
661 phydev->advertising)) {
662 ret = -EOPNOTSUPP;
663 NL_SET_ERR_MSG(extack,
664 "Point to Multi-Point mode is not enabled");
665 } else if (plca_cfg->node_id >= 255) {
666 NL_SET_ERR_MSG(extack, "PLCA node ID is not set");
667 ret = -EINVAL;
668 }
669
670 return ret;
671}
672
673/**
674 * phy_ethtool_set_plca_cfg - Set PLCA RS configuration
675 * @phydev: the phy_device struct
676 * @plca_cfg: new PLCA configuration to apply
677 * @extack: extack for reporting useful error messages
678 *
679 * Sets the PLCA configuration in the PHY. Return 0 on success or a
680 * negative value if an error occurred.
681 */
682int phy_ethtool_set_plca_cfg(struct phy_device *phydev,
683 const struct phy_plca_cfg *plca_cfg,
684 struct netlink_ext_ack *extack)
685{
686 struct phy_plca_cfg *curr_plca_cfg;
687 int ret;
688
689 if (!phydev->drv) {
690 ret = -EIO;
691 goto out;
692 }
693
694 if (!phydev->drv->set_plca_cfg ||
695 !phydev->drv->get_plca_cfg) {
696 ret = -EOPNOTSUPP;
697 goto out;
698 }
699
700 curr_plca_cfg = kmalloc(sizeof(*curr_plca_cfg), GFP_KERNEL);
701 if (!curr_plca_cfg) {
702 ret = -ENOMEM;
703 goto out;
704 }
705
706 mutex_lock(&phydev->lock);
707
708 ret = phydev->drv->get_plca_cfg(phydev, curr_plca_cfg);
709 if (ret)
710 goto out_drv;
711
712 if (curr_plca_cfg->enabled < 0 && plca_cfg->enabled >= 0) {
713 NL_SET_ERR_MSG(extack,
714 "PHY does not support changing the PLCA 'enable' attribute");
715 ret = -EINVAL;
716 goto out_drv;
717 }
718
719 if (curr_plca_cfg->node_id < 0 && plca_cfg->node_id >= 0) {
720 NL_SET_ERR_MSG(extack,
721 "PHY does not support changing the PLCA 'local node ID' attribute");
722 ret = -EINVAL;
723 goto out_drv;
724 }
725
726 if (curr_plca_cfg->node_cnt < 0 && plca_cfg->node_cnt >= 0) {
727 NL_SET_ERR_MSG(extack,
728 "PHY does not support changing the PLCA 'node count' attribute");
729 ret = -EINVAL;
730 goto out_drv;
731 }
732
733 if (curr_plca_cfg->to_tmr < 0 && plca_cfg->to_tmr >= 0) {
734 NL_SET_ERR_MSG(extack,
735 "PHY does not support changing the PLCA 'TO timer' attribute");
736 ret = -EINVAL;
737 goto out_drv;
738 }
739
740 if (curr_plca_cfg->burst_cnt < 0 && plca_cfg->burst_cnt >= 0) {
741 NL_SET_ERR_MSG(extack,
742 "PHY does not support changing the PLCA 'burst count' attribute");
743 ret = -EINVAL;
744 goto out_drv;
745 }
746
747 if (curr_plca_cfg->burst_tmr < 0 && plca_cfg->burst_tmr >= 0) {
748 NL_SET_ERR_MSG(extack,
749 "PHY does not support changing the PLCA 'burst timer' attribute");
750 ret = -EINVAL;
751 goto out_drv;
752 }
753
754 // if enabling PLCA, perform a few sanity checks
755 if (plca_cfg->enabled > 0) {
756 // allow setting node_id concurrently with enabled
757 if (plca_cfg->node_id >= 0)
758 curr_plca_cfg->node_id = plca_cfg->node_id;
759
760 ret = plca_check_valid(phydev, curr_plca_cfg, extack);
761 if (ret)
762 goto out_drv;
763 }
764
765 ret = phydev->drv->set_plca_cfg(phydev, plca_cfg);
766
767out_drv:
768 kfree(curr_plca_cfg);
769 mutex_unlock(&phydev->lock);
770out:
771 return ret;
772}
773
774/**
775 * phy_ethtool_get_plca_status - Get PLCA RS status information
776 * @phydev: the phy_device struct
777 * @plca_st: where to store the retrieved status information
778 *
779 * Retrieve the PLCA status information from the PHY. Return 0 on success or a
780 * negative value if an error occurred.
781 */
782int phy_ethtool_get_plca_status(struct phy_device *phydev,
783 struct phy_plca_status *plca_st)
784{
785 int ret;
786
787 if (!phydev->drv) {
788 ret = -EIO;
789 goto out;
790 }
791
792 if (!phydev->drv->get_plca_status) {
793 ret = -EOPNOTSUPP;
794 goto out;
795 }
796
797 mutex_lock(&phydev->lock);
798 ret = phydev->drv->get_plca_status(phydev, plca_st);
799
800 mutex_unlock(&phydev->lock);
801out:
802 return ret;
803}
804
805/**
806 * phy_start_cable_test - Start a cable test
807 *
808 * @phydev: the phy_device struct
809 * @extack: extack for reporting useful error messages
810 */
811int phy_start_cable_test(struct phy_device *phydev,
812 struct netlink_ext_ack *extack)
813{
814 struct net_device *dev = phydev->attached_dev;
815 int err = -ENOMEM;
816
817 if (!(phydev->drv &&
818 phydev->drv->cable_test_start &&
819 phydev->drv->cable_test_get_status)) {
820 NL_SET_ERR_MSG(extack,
821 "PHY driver does not support cable testing");
822 return -EOPNOTSUPP;
823 }
824
825 mutex_lock(&phydev->lock);
826 if (phydev->state == PHY_CABLETEST) {
827 NL_SET_ERR_MSG(extack,
828 "PHY already performing a test");
829 err = -EBUSY;
830 goto out;
831 }
832
833 if (phydev->state < PHY_UP ||
834 phydev->state > PHY_CABLETEST) {
835 NL_SET_ERR_MSG(extack,
836 "PHY not configured. Try setting interface up");
837 err = -EBUSY;
838 goto out;
839 }
840
841 err = ethnl_cable_test_alloc(phydev, ETHTOOL_MSG_CABLE_TEST_NTF);
842 if (err)
843 goto out;
844
845 /* Mark the carrier down until the test is complete */
846 phy_link_down(phydev);
847
848 netif_testing_on(dev);
849 err = phydev->drv->cable_test_start(phydev);
850 if (err) {
851 netif_testing_off(dev);
852 phy_link_up(phydev);
853 goto out_free;
854 }
855
856 phydev->state = PHY_CABLETEST;
857
858 if (phy_polling_mode(phydev))
859 phy_trigger_machine(phydev);
860
861 mutex_unlock(&phydev->lock);
862
863 return 0;
864
865out_free:
866 ethnl_cable_test_free(phydev);
867out:
868 mutex_unlock(&phydev->lock);
869
870 return err;
871}
872EXPORT_SYMBOL(phy_start_cable_test);
873
874/**
875 * phy_start_cable_test_tdr - Start a raw TDR cable test
876 *
877 * @phydev: the phy_device struct
878 * @extack: extack for reporting useful error messages
879 * @config: Configuration of the test to run
880 */
881int phy_start_cable_test_tdr(struct phy_device *phydev,
882 struct netlink_ext_ack *extack,
883 const struct phy_tdr_config *config)
884{
885 struct net_device *dev = phydev->attached_dev;
886 int err = -ENOMEM;
887
888 if (!(phydev->drv &&
889 phydev->drv->cable_test_tdr_start &&
890 phydev->drv->cable_test_get_status)) {
891 NL_SET_ERR_MSG(extack,
892 "PHY driver does not support cable test TDR");
893 return -EOPNOTSUPP;
894 }
895
896 mutex_lock(&phydev->lock);
897 if (phydev->state == PHY_CABLETEST) {
898 NL_SET_ERR_MSG(extack,
899 "PHY already performing a test");
900 err = -EBUSY;
901 goto out;
902 }
903
904 if (phydev->state < PHY_UP ||
905 phydev->state > PHY_CABLETEST) {
906 NL_SET_ERR_MSG(extack,
907 "PHY not configured. Try setting interface up");
908 err = -EBUSY;
909 goto out;
910 }
911
912 err = ethnl_cable_test_alloc(phydev, ETHTOOL_MSG_CABLE_TEST_TDR_NTF);
913 if (err)
914 goto out;
915
916 /* Mark the carrier down until the test is complete */
917 phy_link_down(phydev);
918
919 netif_testing_on(dev);
920 err = phydev->drv->cable_test_tdr_start(phydev, config);
921 if (err) {
922 netif_testing_off(dev);
923 phy_link_up(phydev);
924 goto out_free;
925 }
926
927 phydev->state = PHY_CABLETEST;
928
929 if (phy_polling_mode(phydev))
930 phy_trigger_machine(phydev);
931
932 mutex_unlock(&phydev->lock);
933
934 return 0;
935
936out_free:
937 ethnl_cable_test_free(phydev);
938out:
939 mutex_unlock(&phydev->lock);
940
941 return err;
942}
943EXPORT_SYMBOL(phy_start_cable_test_tdr);
944
945int phy_config_aneg(struct phy_device *phydev)
946{
947 if (phydev->drv->config_aneg)
948 return phydev->drv->config_aneg(phydev);
949
950 /* Clause 45 PHYs that don't implement Clause 22 registers are not
951 * allowed to call genphy_config_aneg()
952 */
953 if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
954 return genphy_c45_config_aneg(phydev);
955
956 return genphy_config_aneg(phydev);
957}
958EXPORT_SYMBOL(phy_config_aneg);
959
960/**
961 * phy_check_link_status - check link status and set state accordingly
962 * @phydev: the phy_device struct
963 *
964 * Description: Check for link and whether autoneg was triggered / is running
965 * and set state accordingly
966 */
967static int phy_check_link_status(struct phy_device *phydev)
968{
969 int err;
970
971 lockdep_assert_held(&phydev->lock);
972
973 /* Keep previous state if loopback is enabled because some PHYs
974 * report that Link is Down when loopback is enabled.
975 */
976 if (phydev->loopback_enabled)
977 return 0;
978
979 err = phy_read_status(phydev);
980 if (err)
981 return err;
982
983 if (phydev->link && phydev->state != PHY_RUNNING) {
984 phy_check_downshift(phydev);
985 phydev->state = PHY_RUNNING;
986 err = genphy_c45_eee_is_active(phydev,
987 NULL, NULL, NULL);
988 if (err <= 0)
989 phydev->enable_tx_lpi = false;
990 else
991 phydev->enable_tx_lpi = phydev->eee_cfg.tx_lpi_enabled;
992
993 phy_link_up(phydev);
994 } else if (!phydev->link && phydev->state != PHY_NOLINK) {
995 phydev->state = PHY_NOLINK;
996 phydev->enable_tx_lpi = false;
997 phy_link_down(phydev);
998 }
999
1000 return 0;
1001}
1002
1003/**
1004 * _phy_start_aneg - start auto-negotiation for this PHY device
1005 * @phydev: the phy_device struct
1006 *
1007 * Description: Sanitizes the settings (if we're not autonegotiating
1008 * them), and then calls the driver's config_aneg function.
1009 * If the PHYCONTROL Layer is operating, we change the state to
1010 * reflect the beginning of Auto-negotiation or forcing.
1011 */
1012int _phy_start_aneg(struct phy_device *phydev)
1013{
1014 int err;
1015
1016 lockdep_assert_held(&phydev->lock);
1017
1018 if (!phydev->drv)
1019 return -EIO;
1020
1021 if (AUTONEG_DISABLE == phydev->autoneg)
1022 phy_sanitize_settings(phydev);
1023
1024 err = phy_config_aneg(phydev);
1025 if (err < 0)
1026 return err;
1027
1028 if (phy_is_started(phydev))
1029 err = phy_check_link_status(phydev);
1030
1031 return err;
1032}
1033EXPORT_SYMBOL(_phy_start_aneg);
1034
1035/**
1036 * phy_start_aneg - start auto-negotiation for this PHY device
1037 * @phydev: the phy_device struct
1038 *
1039 * Description: Sanitizes the settings (if we're not autonegotiating
1040 * them), and then calls the driver's config_aneg function.
1041 * If the PHYCONTROL Layer is operating, we change the state to
1042 * reflect the beginning of Auto-negotiation or forcing.
1043 */
1044int phy_start_aneg(struct phy_device *phydev)
1045{
1046 int err;
1047
1048 mutex_lock(&phydev->lock);
1049 err = _phy_start_aneg(phydev);
1050 mutex_unlock(&phydev->lock);
1051
1052 return err;
1053}
1054EXPORT_SYMBOL(phy_start_aneg);
1055
1056static int phy_poll_aneg_done(struct phy_device *phydev)
1057{
1058 unsigned int retries = 100;
1059 int ret;
1060
1061 do {
1062 msleep(100);
1063 ret = phy_aneg_done(phydev);
1064 } while (!ret && --retries);
1065
1066 if (!ret)
1067 return -ETIMEDOUT;
1068
1069 return ret < 0 ? ret : 0;
1070}
1071
1072int phy_ethtool_ksettings_set(struct phy_device *phydev,
1073 const struct ethtool_link_ksettings *cmd)
1074{
1075 __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
1076 u8 autoneg = cmd->base.autoneg;
1077 u8 duplex = cmd->base.duplex;
1078 u32 speed = cmd->base.speed;
1079
1080 if (cmd->base.phy_address != phydev->mdio.addr)
1081 return -EINVAL;
1082
1083 linkmode_copy(advertising, cmd->link_modes.advertising);
1084
1085 /* We make sure that we don't pass unsupported values in to the PHY */
1086 linkmode_and(advertising, advertising, phydev->supported);
1087
1088 /* Verify the settings we care about. */
1089 if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
1090 return -EINVAL;
1091
1092 if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
1093 return -EINVAL;
1094
1095 if (autoneg == AUTONEG_DISABLE &&
1096 ((speed != SPEED_1000 &&
1097 speed != SPEED_100 &&
1098 speed != SPEED_10) ||
1099 (duplex != DUPLEX_HALF &&
1100 duplex != DUPLEX_FULL)))
1101 return -EINVAL;
1102
1103 mutex_lock(&phydev->lock);
1104 phydev->autoneg = autoneg;
1105
1106 if (autoneg == AUTONEG_DISABLE) {
1107 phydev->speed = speed;
1108 phydev->duplex = duplex;
1109 }
1110
1111 linkmode_copy(phydev->advertising, advertising);
1112
1113 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
1114 phydev->advertising, autoneg == AUTONEG_ENABLE);
1115
1116 phydev->master_slave_set = cmd->base.master_slave_cfg;
1117 phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
1118
1119 /* Restart the PHY */
1120 if (phy_is_started(phydev)) {
1121 phydev->state = PHY_UP;
1122 phy_trigger_machine(phydev);
1123 } else {
1124 _phy_start_aneg(phydev);
1125 }
1126
1127 mutex_unlock(&phydev->lock);
1128 return 0;
1129}
1130EXPORT_SYMBOL(phy_ethtool_ksettings_set);
1131
1132/**
1133 * phy_speed_down - set speed to lowest speed supported by both link partners
1134 * @phydev: the phy_device struct
1135 * @sync: perform action synchronously
1136 *
1137 * Description: Typically used to save energy when waiting for a WoL packet
1138 *
1139 * WARNING: Setting sync to false may cause the system being unable to suspend
1140 * in case the PHY generates an interrupt when finishing the autonegotiation.
1141 * This interrupt may wake up the system immediately after suspend.
1142 * Therefore use sync = false only if you're sure it's safe with the respective
1143 * network chip.
1144 */
1145int phy_speed_down(struct phy_device *phydev, bool sync)
1146{
1147 __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
1148 int ret = 0;
1149
1150 mutex_lock(&phydev->lock);
1151
1152 if (phydev->autoneg != AUTONEG_ENABLE)
1153 goto out;
1154
1155 linkmode_copy(adv_tmp, phydev->advertising);
1156
1157 ret = phy_speed_down_core(phydev);
1158 if (ret)
1159 goto out;
1160
1161 linkmode_copy(phydev->adv_old, adv_tmp);
1162
1163 if (linkmode_equal(phydev->advertising, adv_tmp)) {
1164 ret = 0;
1165 goto out;
1166 }
1167
1168 ret = phy_config_aneg(phydev);
1169 if (ret)
1170 goto out;
1171
1172 ret = sync ? phy_poll_aneg_done(phydev) : 0;
1173out:
1174 mutex_unlock(&phydev->lock);
1175
1176 return ret;
1177}
1178EXPORT_SYMBOL_GPL(phy_speed_down);
1179
1180/**
1181 * phy_speed_up - (re)set advertised speeds to all supported speeds
1182 * @phydev: the phy_device struct
1183 *
1184 * Description: Used to revert the effect of phy_speed_down
1185 */
1186int phy_speed_up(struct phy_device *phydev)
1187{
1188 __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
1189 int ret = 0;
1190
1191 mutex_lock(&phydev->lock);
1192
1193 if (phydev->autoneg != AUTONEG_ENABLE)
1194 goto out;
1195
1196 if (linkmode_empty(phydev->adv_old))
1197 goto out;
1198
1199 linkmode_copy(adv_tmp, phydev->advertising);
1200 linkmode_copy(phydev->advertising, phydev->adv_old);
1201 linkmode_zero(phydev->adv_old);
1202
1203 if (linkmode_equal(phydev->advertising, adv_tmp))
1204 goto out;
1205
1206 ret = phy_config_aneg(phydev);
1207out:
1208 mutex_unlock(&phydev->lock);
1209
1210 return ret;
1211}
1212EXPORT_SYMBOL_GPL(phy_speed_up);
1213
1214/**
1215 * phy_start_machine - start PHY state machine tracking
1216 * @phydev: the phy_device struct
1217 *
1218 * Description: The PHY infrastructure can run a state machine
1219 * which tracks whether the PHY is starting up, negotiating,
1220 * etc. This function starts the delayed workqueue which tracks
1221 * the state of the PHY. If you want to maintain your own state machine,
1222 * do not call this function.
1223 */
1224void phy_start_machine(struct phy_device *phydev)
1225{
1226 phy_trigger_machine(phydev);
1227}
1228EXPORT_SYMBOL_GPL(phy_start_machine);
1229
1230/**
1231 * phy_stop_machine - stop the PHY state machine tracking
1232 * @phydev: target phy_device struct
1233 *
1234 * Description: Stops the state machine delayed workqueue, sets the
1235 * state to UP (unless it wasn't up yet). This function must be
1236 * called BEFORE phy_detach.
1237 */
1238void phy_stop_machine(struct phy_device *phydev)
1239{
1240 cancel_delayed_work_sync(&phydev->state_queue);
1241
1242 mutex_lock(&phydev->lock);
1243 if (phy_is_started(phydev))
1244 phydev->state = PHY_UP;
1245 mutex_unlock(&phydev->lock);
1246}
1247
1248static void phy_process_error(struct phy_device *phydev)
1249{
1250 /* phydev->lock must be held for the state change to be safe */
1251 if (!mutex_is_locked(&phydev->lock))
1252 phydev_err(phydev, "PHY-device data unsafe context\n");
1253
1254 phydev->state = PHY_ERROR;
1255
1256 phy_trigger_machine(phydev);
1257}
1258
1259static void phy_error_precise(struct phy_device *phydev,
1260 const void *func, int err)
1261{
1262 WARN(1, "%pS: returned: %d\n", func, err);
1263 phy_process_error(phydev);
1264}
1265
1266/**
1267 * phy_error - enter ERROR state for this PHY device
1268 * @phydev: target phy_device struct
1269 *
1270 * Moves the PHY to the ERROR state in response to a read
1271 * or write error, and tells the controller the link is down.
1272 * Must be called with phydev->lock held.
1273 */
1274void phy_error(struct phy_device *phydev)
1275{
1276 WARN_ON(1);
1277 phy_process_error(phydev);
1278}
1279EXPORT_SYMBOL(phy_error);
1280
1281/**
1282 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
1283 * @phydev: target phy_device struct
1284 */
1285int phy_disable_interrupts(struct phy_device *phydev)
1286{
1287 /* Disable PHY interrupts */
1288 return phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
1289}
1290
1291/**
1292 * phy_interrupt - PHY interrupt handler
1293 * @irq: interrupt line
1294 * @phy_dat: phy_device pointer
1295 *
1296 * Description: Handle PHY interrupt
1297 */
1298static irqreturn_t phy_interrupt(int irq, void *phy_dat)
1299{
1300 struct phy_device *phydev = phy_dat;
1301 irqreturn_t ret;
1302
1303 /* Wakeup interrupts may occur during a system sleep transition.
1304 * Postpone handling until the PHY has resumed.
1305 */
1306 if (IS_ENABLED(CONFIG_PM_SLEEP) && phydev->irq_suspended) {
1307 struct net_device *netdev = phydev->attached_dev;
1308
1309 if (netdev) {
1310 struct device *parent = netdev->dev.parent;
1311
1312 if (netdev->wol_enabled)
1313 pm_system_wakeup();
1314 else if (device_may_wakeup(&netdev->dev))
1315 pm_wakeup_dev_event(&netdev->dev, 0, true);
1316 else if (parent && device_may_wakeup(parent))
1317 pm_wakeup_dev_event(parent, 0, true);
1318 }
1319
1320 phydev->irq_rerun = 1;
1321 disable_irq_nosync(irq);
1322 return IRQ_HANDLED;
1323 }
1324
1325 mutex_lock(&phydev->lock);
1326 ret = phydev->drv->handle_interrupt(phydev);
1327 mutex_unlock(&phydev->lock);
1328
1329 return ret;
1330}
1331
1332/**
1333 * phy_enable_interrupts - Enable the interrupts from the PHY side
1334 * @phydev: target phy_device struct
1335 */
1336static int phy_enable_interrupts(struct phy_device *phydev)
1337{
1338 return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
1339}
1340
1341/**
1342 * phy_request_interrupt - request and enable interrupt for a PHY device
1343 * @phydev: target phy_device struct
1344 *
1345 * Description: Request and enable the interrupt for the given PHY.
1346 * If this fails, then we set irq to PHY_POLL.
1347 * This should only be called with a valid IRQ number.
1348 */
1349void phy_request_interrupt(struct phy_device *phydev)
1350{
1351 int err;
1352
1353 err = request_threaded_irq(phydev->irq, NULL, phy_interrupt,
1354 IRQF_ONESHOT | IRQF_SHARED,
1355 phydev_name(phydev), phydev);
1356 if (err) {
1357 phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
1358 err, phydev->irq);
1359 phydev->irq = PHY_POLL;
1360 } else {
1361 if (phy_enable_interrupts(phydev)) {
1362 phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
1363 phy_free_interrupt(phydev);
1364 phydev->irq = PHY_POLL;
1365 }
1366 }
1367}
1368EXPORT_SYMBOL(phy_request_interrupt);
1369
1370/**
1371 * phy_free_interrupt - disable and free interrupt for a PHY device
1372 * @phydev: target phy_device struct
1373 *
1374 * Description: Disable and free the interrupt for the given PHY.
1375 * This should only be called with a valid IRQ number.
1376 */
1377void phy_free_interrupt(struct phy_device *phydev)
1378{
1379 phy_disable_interrupts(phydev);
1380 free_irq(phydev->irq, phydev);
1381}
1382EXPORT_SYMBOL(phy_free_interrupt);
1383
1384enum phy_state_work {
1385 PHY_STATE_WORK_NONE,
1386 PHY_STATE_WORK_ANEG,
1387 PHY_STATE_WORK_SUSPEND,
1388};
1389
1390static enum phy_state_work _phy_state_machine(struct phy_device *phydev)
1391{
1392 enum phy_state_work state_work = PHY_STATE_WORK_NONE;
1393 struct net_device *dev = phydev->attached_dev;
1394 enum phy_state old_state = phydev->state;
1395 const void *func = NULL;
1396 bool finished = false;
1397 int err = 0;
1398
1399 switch (phydev->state) {
1400 case PHY_DOWN:
1401 case PHY_READY:
1402 break;
1403 case PHY_UP:
1404 state_work = PHY_STATE_WORK_ANEG;
1405 break;
1406 case PHY_NOLINK:
1407 case PHY_RUNNING:
1408 err = phy_check_link_status(phydev);
1409 func = &phy_check_link_status;
1410 break;
1411 case PHY_CABLETEST:
1412 err = phydev->drv->cable_test_get_status(phydev, &finished);
1413 if (err) {
1414 phy_abort_cable_test(phydev);
1415 netif_testing_off(dev);
1416 state_work = PHY_STATE_WORK_ANEG;
1417 phydev->state = PHY_UP;
1418 break;
1419 }
1420
1421 if (finished) {
1422 ethnl_cable_test_finished(phydev);
1423 netif_testing_off(dev);
1424 state_work = PHY_STATE_WORK_ANEG;
1425 phydev->state = PHY_UP;
1426 }
1427 break;
1428 case PHY_HALTED:
1429 case PHY_ERROR:
1430 if (phydev->link) {
1431 phydev->link = 0;
1432 phy_link_down(phydev);
1433 }
1434 state_work = PHY_STATE_WORK_SUSPEND;
1435 break;
1436 }
1437
1438 if (state_work == PHY_STATE_WORK_ANEG) {
1439 err = _phy_start_aneg(phydev);
1440 func = &_phy_start_aneg;
1441 }
1442
1443 if (err == -ENODEV)
1444 return state_work;
1445
1446 if (err < 0)
1447 phy_error_precise(phydev, func, err);
1448
1449 phy_process_state_change(phydev, old_state);
1450
1451 /* Only re-schedule a PHY state machine change if we are polling the
1452 * PHY, if PHY_MAC_INTERRUPT is set, then we will be moving
1453 * between states from phy_mac_interrupt().
1454 *
1455 * In state PHY_HALTED the PHY gets suspended, so rescheduling the
1456 * state machine would be pointless and possibly error prone when
1457 * called from phy_disconnect() synchronously.
1458 */
1459 if (phy_polling_mode(phydev) && phy_is_started(phydev))
1460 phy_queue_state_machine(phydev, PHY_STATE_TIME);
1461
1462 return state_work;
1463}
1464
1465/* unlocked part of the PHY state machine */
1466static void _phy_state_machine_post_work(struct phy_device *phydev,
1467 enum phy_state_work state_work)
1468{
1469 if (state_work == PHY_STATE_WORK_SUSPEND)
1470 phy_suspend(phydev);
1471}
1472
1473/**
1474 * phy_state_machine - Handle the state machine
1475 * @work: work_struct that describes the work to be done
1476 */
1477void phy_state_machine(struct work_struct *work)
1478{
1479 struct delayed_work *dwork = to_delayed_work(work);
1480 struct phy_device *phydev =
1481 container_of(dwork, struct phy_device, state_queue);
1482 enum phy_state_work state_work;
1483
1484 mutex_lock(&phydev->lock);
1485 state_work = _phy_state_machine(phydev);
1486 mutex_unlock(&phydev->lock);
1487
1488 _phy_state_machine_post_work(phydev, state_work);
1489}
1490
1491/**
1492 * phy_stop - Bring down the PHY link, and stop checking the status
1493 * @phydev: target phy_device struct
1494 */
1495void phy_stop(struct phy_device *phydev)
1496{
1497 struct net_device *dev = phydev->attached_dev;
1498 enum phy_state_work state_work;
1499 enum phy_state old_state;
1500
1501 if (!phy_is_started(phydev) && phydev->state != PHY_DOWN &&
1502 phydev->state != PHY_ERROR) {
1503 WARN(1, "called from state %s\n",
1504 phy_state_to_str(phydev->state));
1505 return;
1506 }
1507
1508 mutex_lock(&phydev->lock);
1509 old_state = phydev->state;
1510
1511 if (phydev->state == PHY_CABLETEST) {
1512 phy_abort_cable_test(phydev);
1513 netif_testing_off(dev);
1514 }
1515
1516 if (phydev->sfp_bus)
1517 sfp_upstream_stop(phydev->sfp_bus);
1518
1519 phydev->state = PHY_HALTED;
1520 phy_process_state_change(phydev, old_state);
1521
1522 state_work = _phy_state_machine(phydev);
1523 mutex_unlock(&phydev->lock);
1524
1525 _phy_state_machine_post_work(phydev, state_work);
1526 phy_stop_machine(phydev);
1527
1528 /* Cannot call flush_scheduled_work() here as desired because
1529 * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
1530 * will not reenable interrupts.
1531 */
1532}
1533EXPORT_SYMBOL(phy_stop);
1534
1535/**
1536 * phy_start - start or restart a PHY device
1537 * @phydev: target phy_device struct
1538 *
1539 * Description: Indicates the attached device's readiness to
1540 * handle PHY-related work. Used during startup to start the
1541 * PHY, and after a call to phy_stop() to resume operation.
1542 * Also used to indicate the MDIO bus has cleared an error
1543 * condition.
1544 */
1545void phy_start(struct phy_device *phydev)
1546{
1547 mutex_lock(&phydev->lock);
1548
1549 if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
1550 WARN(1, "called from state %s\n",
1551 phy_state_to_str(phydev->state));
1552 goto out;
1553 }
1554
1555 if (phydev->sfp_bus)
1556 sfp_upstream_start(phydev->sfp_bus);
1557
1558 /* if phy was suspended, bring the physical link up again */
1559 __phy_resume(phydev);
1560
1561 phydev->state = PHY_UP;
1562
1563 phy_start_machine(phydev);
1564out:
1565 mutex_unlock(&phydev->lock);
1566}
1567EXPORT_SYMBOL(phy_start);
1568
1569/**
1570 * phy_mac_interrupt - MAC says the link has changed
1571 * @phydev: phy_device struct with changed link
1572 *
1573 * The MAC layer is able to indicate there has been a change in the PHY link
1574 * status. Trigger the state machine and work a work queue.
1575 */
1576void phy_mac_interrupt(struct phy_device *phydev)
1577{
1578 /* Trigger a state machine change */
1579 phy_trigger_machine(phydev);
1580}
1581EXPORT_SYMBOL(phy_mac_interrupt);
1582
1583/**
1584 * phy_init_eee - init and check the EEE feature
1585 * @phydev: target phy_device struct
1586 * @clk_stop_enable: PHY may stop the clock during LPI
1587 *
1588 * Description: it checks if the Energy-Efficient Ethernet (EEE)
1589 * is supported by looking at the MMD registers 3.20 and 7.60/61
1590 * and it programs the MMD register 3.0 setting the "Clock stop enable"
1591 * bit if required.
1592 */
1593int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1594{
1595 int ret;
1596
1597 if (!phydev->drv)
1598 return -EIO;
1599
1600 ret = genphy_c45_eee_is_active(phydev, NULL, NULL, NULL);
1601 if (ret < 0)
1602 return ret;
1603 if (!ret)
1604 return -EPROTONOSUPPORT;
1605
1606 if (clk_stop_enable)
1607 /* Configure the PHY to stop receiving xMII
1608 * clock while it is signaling LPI.
1609 */
1610 ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
1611 MDIO_PCS_CTRL1_CLKSTOP_EN);
1612
1613 return ret < 0 ? ret : 0;
1614}
1615EXPORT_SYMBOL(phy_init_eee);
1616
1617/**
1618 * phy_get_eee_err - report the EEE wake error count
1619 * @phydev: target phy_device struct
1620 *
1621 * Description: it is to report the number of time where the PHY
1622 * failed to complete its normal wake sequence.
1623 */
1624int phy_get_eee_err(struct phy_device *phydev)
1625{
1626 int ret;
1627
1628 if (!phydev->drv)
1629 return -EIO;
1630
1631 mutex_lock(&phydev->lock);
1632 ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1633 mutex_unlock(&phydev->lock);
1634
1635 return ret;
1636}
1637EXPORT_SYMBOL(phy_get_eee_err);
1638
1639/**
1640 * phy_ethtool_get_eee - get EEE supported and status
1641 * @phydev: target phy_device struct
1642 * @data: ethtool_keee data
1643 *
1644 * Description: reports the Supported/Advertisement/LP Advertisement
1645 * capabilities, etc.
1646 */
1647int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_keee *data)
1648{
1649 int ret;
1650
1651 if (!phydev->drv)
1652 return -EIO;
1653
1654 mutex_lock(&phydev->lock);
1655 ret = genphy_c45_ethtool_get_eee(phydev, data);
1656 eeecfg_to_eee(data, &phydev->eee_cfg);
1657 mutex_unlock(&phydev->lock);
1658
1659 return ret;
1660}
1661EXPORT_SYMBOL(phy_ethtool_get_eee);
1662
1663/**
1664 * phy_ethtool_set_eee_noneg - Adjusts MAC LPI configuration without PHY
1665 * renegotiation
1666 * @phydev: pointer to the target PHY device structure
1667 * @data: pointer to the ethtool_keee structure containing the new EEE settings
1668 *
1669 * This function updates the Energy Efficient Ethernet (EEE) configuration
1670 * for cases where only the MAC's Low Power Idle (LPI) configuration changes,
1671 * without triggering PHY renegotiation. It ensures that the MAC is properly
1672 * informed of the new LPI settings by cycling the link down and up, which
1673 * is necessary for the MAC to adopt the new configuration. This adjustment
1674 * is done only if there is a change in the tx_lpi_enabled or tx_lpi_timer
1675 * configuration.
1676 */
1677static void phy_ethtool_set_eee_noneg(struct phy_device *phydev,
1678 struct ethtool_keee *data)
1679{
1680 if (phydev->eee_cfg.tx_lpi_enabled != data->tx_lpi_enabled ||
1681 phydev->eee_cfg.tx_lpi_timer != data->tx_lpi_timer) {
1682 eee_to_eeecfg(&phydev->eee_cfg, data);
1683 phydev->enable_tx_lpi = eeecfg_mac_can_tx_lpi(&phydev->eee_cfg);
1684 if (phydev->link) {
1685 phydev->link = false;
1686 phy_link_down(phydev);
1687 phydev->link = true;
1688 phy_link_up(phydev);
1689 }
1690 }
1691}
1692
1693/**
1694 * phy_ethtool_set_eee - set EEE supported and status
1695 * @phydev: target phy_device struct
1696 * @data: ethtool_keee data
1697 *
1698 * Description: it is to program the Advertisement EEE register.
1699 */
1700int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_keee *data)
1701{
1702 int ret;
1703
1704 if (!phydev->drv)
1705 return -EIO;
1706
1707 mutex_lock(&phydev->lock);
1708 ret = genphy_c45_ethtool_set_eee(phydev, data);
1709 if (ret >= 0) {
1710 if (ret == 0)
1711 phy_ethtool_set_eee_noneg(phydev, data);
1712 eee_to_eeecfg(&phydev->eee_cfg, data);
1713 }
1714 mutex_unlock(&phydev->lock);
1715
1716 return ret < 0 ? ret : 0;
1717}
1718EXPORT_SYMBOL(phy_ethtool_set_eee);
1719
1720/**
1721 * phy_ethtool_set_wol - Configure Wake On LAN
1722 *
1723 * @phydev: target phy_device struct
1724 * @wol: Configuration requested
1725 */
1726int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1727{
1728 int ret;
1729
1730 if (phydev->drv && phydev->drv->set_wol) {
1731 mutex_lock(&phydev->lock);
1732 ret = phydev->drv->set_wol(phydev, wol);
1733 mutex_unlock(&phydev->lock);
1734
1735 return ret;
1736 }
1737
1738 return -EOPNOTSUPP;
1739}
1740EXPORT_SYMBOL(phy_ethtool_set_wol);
1741
1742/**
1743 * phy_ethtool_get_wol - Get the current Wake On LAN configuration
1744 *
1745 * @phydev: target phy_device struct
1746 * @wol: Store the current configuration here
1747 */
1748void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1749{
1750 if (phydev->drv && phydev->drv->get_wol) {
1751 mutex_lock(&phydev->lock);
1752 phydev->drv->get_wol(phydev, wol);
1753 mutex_unlock(&phydev->lock);
1754 }
1755}
1756EXPORT_SYMBOL(phy_ethtool_get_wol);
1757
1758int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1759 struct ethtool_link_ksettings *cmd)
1760{
1761 struct phy_device *phydev = ndev->phydev;
1762
1763 if (!phydev)
1764 return -ENODEV;
1765
1766 phy_ethtool_ksettings_get(phydev, cmd);
1767
1768 return 0;
1769}
1770EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1771
1772int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1773 const struct ethtool_link_ksettings *cmd)
1774{
1775 struct phy_device *phydev = ndev->phydev;
1776
1777 if (!phydev)
1778 return -ENODEV;
1779
1780 return phy_ethtool_ksettings_set(phydev, cmd);
1781}
1782EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1783
1784/**
1785 * phy_ethtool_nway_reset - Restart auto negotiation
1786 * @ndev: Network device to restart autoneg for
1787 */
1788int phy_ethtool_nway_reset(struct net_device *ndev)
1789{
1790 struct phy_device *phydev = ndev->phydev;
1791 int ret;
1792
1793 if (!phydev)
1794 return -ENODEV;
1795
1796 if (!phydev->drv)
1797 return -EIO;
1798
1799 mutex_lock(&phydev->lock);
1800 ret = phy_restart_aneg(phydev);
1801 mutex_unlock(&phydev->lock);
1802
1803 return ret;
1804}
1805EXPORT_SYMBOL(phy_ethtool_nway_reset);