This patch adds a PHY Abstraction Layer to the Linux Kernel, enabling
[linux-2.6.git] / drivers / net / phy / phy.c
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  *
11  * This program is free software; you can redistribute  it and/or modify it
12  * under  the terms of  the GNU General  Public License as published by the
13  * Free Software Foundation;  either version 2 of the  License, or (at your
14  * option) any later version.
15  *
16  */
17 #include <linux/config.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/slab.h>
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/netdevice.h>
28 #include <linux/etherdevice.h>
29 #include <linux/skbuff.h>
30 #include <linux/spinlock.h>
31 #include <linux/mm.h>
32 #include <linux/module.h>
33 #include <linux/version.h>
34 #include <linux/mii.h>
35 #include <linux/ethtool.h>
36 #include <linux/phy.h>
37
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/uaccess.h>
41
42 static void phy_change(void *data);
43 static void phy_timer(unsigned long data);
44
45 /* Convenience function to print out the current phy status
46  */
47 void phy_print_status(struct phy_device *phydev)
48 {
49         pr_info("%s: Link is %s", phydev->dev.bus_id,
50                         phydev->link ? "Up" : "Down");
51         if (phydev->link)
52                 printk(" - %d/%s", phydev->speed,
53                                 DUPLEX_FULL == phydev->duplex ?
54                                 "Full" : "Half");
55
56         printk("\n");
57 }
58 EXPORT_SYMBOL(phy_print_status);
59
60
61 /* Convenience functions for reading/writing a given PHY
62  * register. They MUST NOT be called from interrupt context,
63  * because the bus read/write functions may wait for an interrupt
64  * to conclude the operation. */
65 int phy_read(struct phy_device *phydev, u16 regnum)
66 {
67         int retval;
68         struct mii_bus *bus = phydev->bus;
69
70         spin_lock_bh(&bus->mdio_lock);
71         retval = bus->read(bus, phydev->addr, regnum);
72         spin_unlock_bh(&bus->mdio_lock);
73
74         return retval;
75 }
76 EXPORT_SYMBOL(phy_read);
77
78 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
79 {
80         int err;
81         struct mii_bus *bus = phydev->bus;
82
83         spin_lock_bh(&bus->mdio_lock);
84         err = bus->write(bus, phydev->addr, regnum, val);
85         spin_unlock_bh(&bus->mdio_lock);
86
87         return err;
88 }
89 EXPORT_SYMBOL(phy_write);
90
91
92 int phy_clear_interrupt(struct phy_device *phydev)
93 {
94         int err = 0;
95
96         if (phydev->drv->ack_interrupt)
97                 err = phydev->drv->ack_interrupt(phydev);
98
99         return err;
100 }
101
102
103 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
104 {
105         int err = 0;
106
107         phydev->interrupts = interrupts;
108         if (phydev->drv->config_intr)
109                 err = phydev->drv->config_intr(phydev);
110
111         return err;
112 }
113
114
115 /* phy_aneg_done
116  *
117  * description: Reads the status register and returns 0 either if
118  *   auto-negotiation is incomplete, or if there was an error.
119  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
120  */
121 static inline int phy_aneg_done(struct phy_device *phydev)
122 {
123         int retval;
124
125         retval = phy_read(phydev, MII_BMSR);
126
127         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
128 }
129
130 /* phy_start_aneg
131  *
132  * description: Calls the PHY driver's config_aneg, and then
133  *   sets the PHY state to PHY_AN if auto-negotiation is enabled,
134  *   and to PHY_FORCING if auto-negotiation is disabled. Unless
135  *   the PHY is currently HALTED.
136  */
137 int phy_start_aneg(struct phy_device *phydev)
138 {
139         int err;
140
141         spin_lock(&phydev->lock);
142
143         if (AUTONEG_DISABLE == phydev->autoneg)
144                 phy_sanitize_settings(phydev);
145
146         err = phydev->drv->config_aneg(phydev);
147
148         if (err < 0)
149                 goto out_unlock;
150
151         if (phydev->state != PHY_HALTED) {
152                 if (AUTONEG_ENABLE == phydev->autoneg) {
153                         phydev->state = PHY_AN;
154                         phydev->link_timeout = PHY_AN_TIMEOUT;
155                 } else {
156                         phydev->state = PHY_FORCING;
157                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
158                 }
159         }
160
161 out_unlock:
162         spin_unlock(&phydev->lock);
163         return err;
164 }
165 EXPORT_SYMBOL(phy_start_aneg);
166
167
168 /* A structure for mapping a particular speed and duplex
169  * combination to a particular SUPPORTED and ADVERTISED value */
170 struct phy_setting {
171         int speed;
172         int duplex;
173         u32 setting;
174 };
175
176 /* A mapping of all SUPPORTED settings to speed/duplex */
177 static struct phy_setting settings[] = {
178         {
179                 .speed = 10000,
180                 .duplex = DUPLEX_FULL,
181                 .setting = SUPPORTED_10000baseT_Full,
182         },
183         {
184                 .speed = SPEED_1000,
185                 .duplex = DUPLEX_FULL,
186                 .setting = SUPPORTED_1000baseT_Full,
187         },
188         {
189                 .speed = SPEED_1000,
190                 .duplex = DUPLEX_HALF,
191                 .setting = SUPPORTED_1000baseT_Half,
192         },
193         {
194                 .speed = SPEED_100,
195                 .duplex = DUPLEX_FULL,
196                 .setting = SUPPORTED_100baseT_Full,
197         },
198         {
199                 .speed = SPEED_100,
200                 .duplex = DUPLEX_HALF,
201                 .setting = SUPPORTED_100baseT_Half,
202         },
203         {
204                 .speed = SPEED_10,
205                 .duplex = DUPLEX_FULL,
206                 .setting = SUPPORTED_10baseT_Full,
207         },
208         {
209                 .speed = SPEED_10,
210                 .duplex = DUPLEX_HALF,
211                 .setting = SUPPORTED_10baseT_Half,
212         },
213 };
214
215 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
216
217 /* phy_find_setting
218  *
219  * description: Searches the settings array for the setting which
220  *   matches the desired speed and duplex, and returns the index
221  *   of that setting.  Returns the index of the last setting if
222  *   none of the others match.
223  */
224 static inline int phy_find_setting(int speed, int duplex)
225 {
226         int idx = 0;
227
228         while (idx < ARRAY_SIZE(settings) &&
229                         (settings[idx].speed != speed ||
230                         settings[idx].duplex != duplex))
231                 idx++;
232
233         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
234 }
235
236 /* phy_find_valid
237  * idx: The first index in settings[] to search
238  * features: A mask of the valid settings
239  *
240  * description: Returns the index of the first valid setting less
241  *   than or equal to the one pointed to by idx, as determined by
242  *   the mask in features.  Returns the index of the last setting
243  *   if nothing else matches.
244  */
245 static inline int phy_find_valid(int idx, u32 features)
246 {
247         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
248                 idx++;
249
250         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
251 }
252
253 /* phy_sanitize_settings
254  *
255  * description: Make sure the PHY is set to supported speeds and
256  *   duplexes.  Drop down by one in this order:  1000/FULL,
257  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
258  */
259 void phy_sanitize_settings(struct phy_device *phydev)
260 {
261         u32 features = phydev->supported;
262         int idx;
263
264         /* Sanitize settings based on PHY capabilities */
265         if ((features & SUPPORTED_Autoneg) == 0)
266                 phydev->autoneg = 0;
267
268         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
269                         features);
270
271         phydev->speed = settings[idx].speed;
272         phydev->duplex = settings[idx].duplex;
273 }
274 EXPORT_SYMBOL(phy_sanitize_settings);
275
276 /* phy_force_reduction
277  *
278  * description: Reduces the speed/duplex settings by
279  *   one notch.  The order is so:
280  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
281  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
282  */
283 static void phy_force_reduction(struct phy_device *phydev)
284 {
285         int idx;
286
287         idx = phy_find_setting(phydev->speed, phydev->duplex);
288         
289         idx++;
290
291         idx = phy_find_valid(idx, phydev->supported);
292
293         phydev->speed = settings[idx].speed;
294         phydev->duplex = settings[idx].duplex;
295
296         pr_info("Trying %d/%s\n", phydev->speed,
297                         DUPLEX_FULL == phydev->duplex ?
298                         "FULL" : "HALF");
299 }
300
301 /* phy_ethtool_sset:
302  * A generic ethtool sset function.  Handles all the details
303  *
304  * A few notes about parameter checking:
305  * - We don't set port or transceiver, so we don't care what they
306  *   were set to.
307  * - phy_start_aneg() will make sure forced settings are sane, and
308  *   choose the next best ones from the ones selected, so we don't
309  *   care if ethtool tries to give us bad values
310  */
311 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
312 {
313         if (cmd->phy_address != phydev->addr)
314                 return -EINVAL;
315
316         /* We make sure that we don't pass unsupported
317          * values in to the PHY */
318         cmd->advertising &= phydev->supported;
319
320         /* Verify the settings we care about. */
321         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
322                 return -EINVAL;
323
324         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
325                 return -EINVAL;
326
327         if (cmd->autoneg == AUTONEG_DISABLE
328                         && ((cmd->speed != SPEED_1000
329                                         && cmd->speed != SPEED_100
330                                         && cmd->speed != SPEED_10)
331                                 || (cmd->duplex != DUPLEX_HALF
332                                         && cmd->duplex != DUPLEX_FULL)))
333                 return -EINVAL;
334
335         phydev->autoneg = cmd->autoneg;
336
337         phydev->speed = cmd->speed;
338
339         phydev->advertising = cmd->advertising;
340
341         if (AUTONEG_ENABLE == cmd->autoneg)
342                 phydev->advertising |= ADVERTISED_Autoneg;
343         else
344                 phydev->advertising &= ~ADVERTISED_Autoneg;
345
346         phydev->duplex = cmd->duplex;
347
348         /* Restart the PHY */
349         phy_start_aneg(phydev);
350
351         return 0;
352 }
353
354 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
355 {
356         cmd->supported = phydev->supported;
357
358         cmd->advertising = phydev->advertising;
359
360         cmd->speed = phydev->speed;
361         cmd->duplex = phydev->duplex;
362         cmd->port = PORT_MII;
363         cmd->phy_address = phydev->addr;
364         cmd->transceiver = XCVR_EXTERNAL;
365         cmd->autoneg = phydev->autoneg;
366
367         return 0;
368 }
369
370
371 /* Note that this function is currently incompatible with the
372  * PHYCONTROL layer.  It changes registers without regard to
373  * current state.  Use at own risk
374  */
375 int phy_mii_ioctl(struct phy_device *phydev,
376                 struct mii_ioctl_data *mii_data, int cmd)
377 {
378         u16 val = mii_data->val_in;
379
380         switch (cmd) {
381         case SIOCGMIIPHY:
382                 mii_data->phy_id = phydev->addr;
383                 break;
384         case SIOCGMIIREG:
385                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
386                 break;
387
388         case SIOCSMIIREG:
389                 if (!capable(CAP_NET_ADMIN))
390                         return -EPERM;
391
392                 if (mii_data->phy_id == phydev->addr) {
393                         switch(mii_data->reg_num) {
394                         case MII_BMCR:
395                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
396                                         phydev->autoneg = AUTONEG_DISABLE;
397                                 else
398                                         phydev->autoneg = AUTONEG_ENABLE;
399                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
400                                         phydev->duplex = DUPLEX_FULL;
401                                 else
402                                         phydev->duplex = DUPLEX_HALF;
403                                 break;
404                         case MII_ADVERTISE:
405                                 phydev->advertising = val;
406                                 break;
407                         default:
408                                 /* do nothing */
409                                 break;
410                         }
411                 }
412
413                 phy_write(phydev, mii_data->reg_num, val);
414                 
415                 if (mii_data->reg_num == MII_BMCR 
416                                 && val & BMCR_RESET
417                                 && phydev->drv->config_init)
418                         phydev->drv->config_init(phydev);
419                 break;
420         }
421
422         return 0;
423 }
424
425 /* phy_start_machine:
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
431  *   changes, pass in the callback, otherwise, pass NULL.  If you
432  *   want to maintain your own state machine, do not call this
433  *   function. */
434 void phy_start_machine(struct phy_device *phydev,
435                 void (*handler)(struct net_device *))
436 {
437         phydev->adjust_state = handler;
438
439         init_timer(&phydev->phy_timer);
440         phydev->phy_timer.function = &phy_timer;
441         phydev->phy_timer.data = (unsigned long) phydev;
442         mod_timer(&phydev->phy_timer, jiffies + HZ);
443 }
444
445 /* phy_stop_machine
446  *
447  * description: Stops the state machine timer, sets the state to
448  *   UP (unless it wasn't up yet), and then frees the interrupt,
449  *   if it is in use. This function must be called BEFORE
450  *   phy_detach.
451  */
452 void phy_stop_machine(struct phy_device *phydev)
453 {
454         del_timer_sync(&phydev->phy_timer);
455
456         spin_lock(&phydev->lock);
457         if (phydev->state > PHY_UP)
458                 phydev->state = PHY_UP;
459         spin_unlock(&phydev->lock);
460
461         if (phydev->irq != PHY_POLL)
462                 phy_stop_interrupts(phydev);
463
464         phydev->adjust_state = NULL;
465 }
466
467 #ifdef CONFIG_PHYCONTROL
468 /* phy_error:
469  *
470  * Moves the PHY to the HALTED state in response to a read
471  * or write error, and tells the controller the link is down.
472  * Must not be called from interrupt context, or while the
473  * phydev->lock is held.
474  */
475 void phy_error(struct phy_device *phydev)
476 {
477         spin_lock(&phydev->lock);
478         phydev->state = PHY_HALTED;
479         spin_unlock(&phydev->lock);
480 }
481
482 /* phy_interrupt
483  *
484  * description: When a PHY interrupt occurs, the handler disables
485  * interrupts, and schedules a work task to clear the interrupt.
486  */
487 static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs)
488 {
489         struct phy_device *phydev = phy_dat;
490
491         /* The MDIO bus is not allowed to be written in interrupt
492          * context, so we need to disable the irq here.  A work
493          * queue will write the PHY to disable and clear the
494          * interrupt, and then reenable the irq line. */
495         disable_irq_nosync(irq);
496
497         schedule_work(&phydev->phy_queue);
498
499         return IRQ_HANDLED;
500 }
501
502 /* Enable the interrupts from the PHY side */
503 int phy_enable_interrupts(struct phy_device *phydev)
504 {
505         int err;
506
507         err = phy_clear_interrupt(phydev);
508
509         if (err < 0)
510                 return err;
511
512         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
513
514         return err;
515 }
516 EXPORT_SYMBOL(phy_enable_interrupts);
517
518 /* Disable the PHY interrupts from the PHY side */
519 int phy_disable_interrupts(struct phy_device *phydev)
520 {
521         int err;
522
523         /* Disable PHY interrupts */
524         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
525
526         if (err)
527                 goto phy_err;
528
529         /* Clear the interrupt */
530         err = phy_clear_interrupt(phydev);
531
532         if (err)
533                 goto phy_err;
534
535         return 0;
536
537 phy_err:
538         phy_error(phydev);
539
540         return err;
541 }
542 EXPORT_SYMBOL(phy_disable_interrupts);
543
544 /* phy_start_interrupts
545  *
546  * description: Request the interrupt for the given PHY.  If
547  *   this fails, then we set irq to PHY_POLL.
548  *   Otherwise, we enable the interrupts in the PHY.
549  *   Returns 0 on success.
550  *   This should only be called with a valid IRQ number.
551  */
552 int phy_start_interrupts(struct phy_device *phydev)
553 {
554         int err = 0;
555
556         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
557
558         if (request_irq(phydev->irq, phy_interrupt,
559                                 SA_SHIRQ,
560                                 "phy_interrupt",
561                                 phydev) < 0) {
562                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
563                                 phydev->bus->name,
564                                 phydev->irq);
565                 phydev->irq = PHY_POLL;
566                 return 0;
567         }
568
569         err = phy_enable_interrupts(phydev);
570
571         return err;
572 }
573 EXPORT_SYMBOL(phy_start_interrupts);
574
575 int phy_stop_interrupts(struct phy_device *phydev)
576 {
577         int err;
578
579         err = phy_disable_interrupts(phydev);
580
581         if (err)
582                 phy_error(phydev);
583
584         free_irq(phydev->irq, phydev);
585
586         return err;
587 }
588 EXPORT_SYMBOL(phy_stop_interrupts);
589
590
591 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
592 static void phy_change(void *data)
593 {
594         int err;
595         struct phy_device *phydev = data;
596
597         err = phy_disable_interrupts(phydev);
598
599         if (err)
600                 goto phy_err;
601
602         spin_lock(&phydev->lock);
603         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
604                 phydev->state = PHY_CHANGELINK;
605         spin_unlock(&phydev->lock);
606
607         enable_irq(phydev->irq);
608
609         /* Reenable interrupts */
610         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
611
612         if (err)
613                 goto irq_enable_err;
614
615         return;
616
617 irq_enable_err:
618         disable_irq(phydev->irq);
619 phy_err:
620         phy_error(phydev);
621 }
622
623 /* Bring down the PHY link, and stop checking the status. */
624 void phy_stop(struct phy_device *phydev)
625 {
626         spin_lock(&phydev->lock);
627
628         if (PHY_HALTED == phydev->state)
629                 goto out_unlock;
630
631         if (phydev->irq != PHY_POLL) {
632                 /* Clear any pending interrupts */
633                 phy_clear_interrupt(phydev);
634
635                 /* Disable PHY Interrupts */
636                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
637         }
638
639         phydev->state = PHY_HALTED;
640
641 out_unlock:
642         spin_unlock(&phydev->lock);
643 }
644
645
646 /* phy_start
647  *
648  * description: Indicates the attached device's readiness to
649  *   handle PHY-related work.  Used during startup to start the
650  *   PHY, and after a call to phy_stop() to resume operation.
651  *   Also used to indicate the MDIO bus has cleared an error
652  *   condition.
653  */
654 void phy_start(struct phy_device *phydev)
655 {
656         spin_lock(&phydev->lock);
657
658         switch (phydev->state) {
659                 case PHY_STARTING:
660                         phydev->state = PHY_PENDING;
661                         break;
662                 case PHY_READY:
663                         phydev->state = PHY_UP;
664                         break;
665                 case PHY_HALTED:
666                         phydev->state = PHY_RESUMING;
667                 default:
668                         break;
669         }
670         spin_unlock(&phydev->lock);
671 }
672 EXPORT_SYMBOL(phy_stop);
673 EXPORT_SYMBOL(phy_start);
674
675 /* PHY timer which handles the state machine */
676 static void phy_timer(unsigned long data)
677 {
678         struct phy_device *phydev = (struct phy_device *)data;
679         int needs_aneg = 0;
680         int err = 0;
681
682         spin_lock(&phydev->lock);
683
684         if (phydev->adjust_state)
685                 phydev->adjust_state(phydev->attached_dev);
686
687         switch(phydev->state) {
688                 case PHY_DOWN:
689                 case PHY_STARTING:
690                 case PHY_READY:
691                 case PHY_PENDING:
692                         break;
693                 case PHY_UP:
694                         needs_aneg = 1;
695
696                         phydev->link_timeout = PHY_AN_TIMEOUT;
697
698                         break;
699                 case PHY_AN:
700                         /* Check if negotiation is done.  Break
701                          * if there's an error */
702                         err = phy_aneg_done(phydev);
703                         if (err < 0)
704                                 break;
705
706                         /* If auto-negotiation is done, we change to
707                          * either RUNNING, or NOLINK */
708                         if (err > 0) {
709                                 err = phy_read_status(phydev);
710
711                                 if (err)
712                                         break;
713
714                                 if (phydev->link) {
715                                         phydev->state = PHY_RUNNING;
716                                         netif_carrier_on(phydev->attached_dev);
717                                 } else {
718                                         phydev->state = PHY_NOLINK;
719                                         netif_carrier_off(phydev->attached_dev);
720                                 }
721
722                                 phydev->adjust_link(phydev->attached_dev);
723
724                         } else if (0 == phydev->link_timeout--) {
725                                 /* The counter expired, so either we
726                                  * switch to forced mode, or the
727                                  * magic_aneg bit exists, and we try aneg
728                                  * again */
729                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
730                                         int idx;
731
732                                         /* We'll start from the
733                                          * fastest speed, and work
734                                          * our way down */
735                                         idx = phy_find_valid(0,
736                                                         phydev->supported);
737
738                                         phydev->speed = settings[idx].speed;
739                                         phydev->duplex = settings[idx].duplex;
740                                         
741                                         phydev->autoneg = AUTONEG_DISABLE;
742                                         phydev->state = PHY_FORCING;
743                                         phydev->link_timeout =
744                                                 PHY_FORCE_TIMEOUT;
745
746                                         pr_info("Trying %d/%s\n",
747                                                         phydev->speed,
748                                                         DUPLEX_FULL ==
749                                                         phydev->duplex ?
750                                                         "FULL" : "HALF");
751                                 }
752
753                                 needs_aneg = 1;
754                         }
755                         break;
756                 case PHY_NOLINK:
757                         err = phy_read_status(phydev);
758
759                         if (err)
760                                 break;
761
762                         if (phydev->link) {
763                                 phydev->state = PHY_RUNNING;
764                                 netif_carrier_on(phydev->attached_dev);
765                                 phydev->adjust_link(phydev->attached_dev);
766                         }
767                         break;
768                 case PHY_FORCING:
769                         err = phy_read_status(phydev);
770
771                         if (err)
772                                 break;
773
774                         if (phydev->link) {
775                                 phydev->state = PHY_RUNNING;
776                                 netif_carrier_on(phydev->attached_dev);
777                         } else {
778                                 if (0 == phydev->link_timeout--) {
779                                         phy_force_reduction(phydev);
780                                         needs_aneg = 1;
781                                 }
782                         }
783
784                         phydev->adjust_link(phydev->attached_dev);
785                         break;
786                 case PHY_RUNNING:
787                         /* Only register a CHANGE if we are
788                          * polling */
789                         if (PHY_POLL == phydev->irq)
790                                 phydev->state = PHY_CHANGELINK;
791                         break;
792                 case PHY_CHANGELINK:
793                         err = phy_read_status(phydev);
794
795                         if (err)
796                                 break;
797
798                         if (phydev->link) {
799                                 phydev->state = PHY_RUNNING;
800                                 netif_carrier_on(phydev->attached_dev);
801                         } else {
802                                 phydev->state = PHY_NOLINK;
803                                 netif_carrier_off(phydev->attached_dev);
804                         }
805
806                         phydev->adjust_link(phydev->attached_dev);
807
808                         if (PHY_POLL != phydev->irq)
809                                 err = phy_config_interrupt(phydev,
810                                                 PHY_INTERRUPT_ENABLED);
811                         break;
812                 case PHY_HALTED:
813                         if (phydev->link) {
814                                 phydev->link = 0;
815                                 netif_carrier_off(phydev->attached_dev);
816                                 phydev->adjust_link(phydev->attached_dev);
817                         }
818                         break;
819                 case PHY_RESUMING:
820
821                         err = phy_clear_interrupt(phydev);
822
823                         if (err)
824                                 break;
825
826                         err = phy_config_interrupt(phydev,
827                                         PHY_INTERRUPT_ENABLED);
828
829                         if (err)
830                                 break;
831
832                         if (AUTONEG_ENABLE == phydev->autoneg) {
833                                 err = phy_aneg_done(phydev);
834                                 if (err < 0)
835                                         break;
836
837                                 /* err > 0 if AN is done.
838                                  * Otherwise, it's 0, and we're
839                                  * still waiting for AN */
840                                 if (err > 0) {
841                                         phydev->state = PHY_RUNNING;
842                                 } else {
843                                         phydev->state = PHY_AN;
844                                         phydev->link_timeout = PHY_AN_TIMEOUT;
845                                 }
846                         } else
847                                 phydev->state = PHY_RUNNING;
848                         break;
849         }
850
851         spin_unlock(&phydev->lock);
852
853         if (needs_aneg)
854                 err = phy_start_aneg(phydev);
855
856         if (err < 0)
857                 phy_error(phydev);
858
859         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
860 }
861
862 #endif /* CONFIG_PHYCONTROL */