3af9fcf76c81a2688c4596b00d823482f530b07f
[linux-3.10.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/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/unistd.h>
22 #include <linux/slab.h>
23 #include <linux/interrupt.h>
24 #include <linux/init.h>
25 #include <linux/delay.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/skbuff.h>
29 #include <linux/spinlock.h>
30 #include <linux/mm.h>
31 #include <linux/module.h>
32 #include <linux/mii.h>
33 #include <linux/ethtool.h>
34 #include <linux/phy.h>
35
36 #include <asm/io.h>
37 #include <asm/irq.h>
38 #include <asm/uaccess.h>
39
40 /* Convenience function to print out the current phy status
41  */
42 void phy_print_status(struct phy_device *phydev)
43 {
44         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
45                         phydev->link ? "Up" : "Down");
46         if (phydev->link)
47                 printk(" - %d/%s", phydev->speed,
48                                 DUPLEX_FULL == phydev->duplex ?
49                                 "Full" : "Half");
50
51         printk("\n");
52 }
53 EXPORT_SYMBOL(phy_print_status);
54
55
56 /* Convenience functions for reading/writing a given PHY
57  * register. They MUST NOT be called from interrupt context,
58  * because the bus read/write functions may wait for an interrupt
59  * to conclude the operation. */
60 int phy_read(struct phy_device *phydev, u16 regnum)
61 {
62         int retval;
63         struct mii_bus *bus = phydev->bus;
64
65         spin_lock_bh(&bus->mdio_lock);
66         retval = bus->read(bus, phydev->addr, regnum);
67         spin_unlock_bh(&bus->mdio_lock);
68
69         return retval;
70 }
71 EXPORT_SYMBOL(phy_read);
72
73 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
74 {
75         int err;
76         struct mii_bus *bus = phydev->bus;
77
78         spin_lock_bh(&bus->mdio_lock);
79         err = bus->write(bus, phydev->addr, regnum, val);
80         spin_unlock_bh(&bus->mdio_lock);
81
82         return err;
83 }
84 EXPORT_SYMBOL(phy_write);
85
86
87 int phy_clear_interrupt(struct phy_device *phydev)
88 {
89         int err = 0;
90
91         if (phydev->drv->ack_interrupt)
92                 err = phydev->drv->ack_interrupt(phydev);
93
94         return err;
95 }
96
97
98 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
99 {
100         int err = 0;
101
102         phydev->interrupts = interrupts;
103         if (phydev->drv->config_intr)
104                 err = phydev->drv->config_intr(phydev);
105
106         return err;
107 }
108
109
110 /* phy_aneg_done
111  *
112  * description: Reads the status register and returns 0 either if
113  *   auto-negotiation is incomplete, or if there was an error.
114  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
115  */
116 static inline int phy_aneg_done(struct phy_device *phydev)
117 {
118         int retval;
119
120         retval = phy_read(phydev, MII_BMSR);
121
122         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
123 }
124
125 /* A structure for mapping a particular speed and duplex
126  * combination to a particular SUPPORTED and ADVERTISED value */
127 struct phy_setting {
128         int speed;
129         int duplex;
130         u32 setting;
131 };
132
133 /* A mapping of all SUPPORTED settings to speed/duplex */
134 static const struct phy_setting settings[] = {
135         {
136                 .speed = 10000,
137                 .duplex = DUPLEX_FULL,
138                 .setting = SUPPORTED_10000baseT_Full,
139         },
140         {
141                 .speed = SPEED_1000,
142                 .duplex = DUPLEX_FULL,
143                 .setting = SUPPORTED_1000baseT_Full,
144         },
145         {
146                 .speed = SPEED_1000,
147                 .duplex = DUPLEX_HALF,
148                 .setting = SUPPORTED_1000baseT_Half,
149         },
150         {
151                 .speed = SPEED_100,
152                 .duplex = DUPLEX_FULL,
153                 .setting = SUPPORTED_100baseT_Full,
154         },
155         {
156                 .speed = SPEED_100,
157                 .duplex = DUPLEX_HALF,
158                 .setting = SUPPORTED_100baseT_Half,
159         },
160         {
161                 .speed = SPEED_10,
162                 .duplex = DUPLEX_FULL,
163                 .setting = SUPPORTED_10baseT_Full,
164         },
165         {
166                 .speed = SPEED_10,
167                 .duplex = DUPLEX_HALF,
168                 .setting = SUPPORTED_10baseT_Half,
169         },
170 };
171
172 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
173
174 /* phy_find_setting
175  *
176  * description: Searches the settings array for the setting which
177  *   matches the desired speed and duplex, and returns the index
178  *   of that setting.  Returns the index of the last setting if
179  *   none of the others match.
180  */
181 static inline int phy_find_setting(int speed, int duplex)
182 {
183         int idx = 0;
184
185         while (idx < ARRAY_SIZE(settings) &&
186                         (settings[idx].speed != speed ||
187                         settings[idx].duplex != duplex))
188                 idx++;
189
190         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
191 }
192
193 /* phy_find_valid
194  * idx: The first index in settings[] to search
195  * features: A mask of the valid settings
196  *
197  * description: Returns the index of the first valid setting less
198  *   than or equal to the one pointed to by idx, as determined by
199  *   the mask in features.  Returns the index of the last setting
200  *   if nothing else matches.
201  */
202 static inline int phy_find_valid(int idx, u32 features)
203 {
204         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
205                 idx++;
206
207         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
208 }
209
210 /* phy_sanitize_settings
211  *
212  * description: Make sure the PHY is set to supported speeds and
213  *   duplexes.  Drop down by one in this order:  1000/FULL,
214  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
215  */
216 void phy_sanitize_settings(struct phy_device *phydev)
217 {
218         u32 features = phydev->supported;
219         int idx;
220
221         /* Sanitize settings based on PHY capabilities */
222         if ((features & SUPPORTED_Autoneg) == 0)
223                 phydev->autoneg = 0;
224
225         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
226                         features);
227
228         phydev->speed = settings[idx].speed;
229         phydev->duplex = settings[idx].duplex;
230 }
231 EXPORT_SYMBOL(phy_sanitize_settings);
232
233 /* phy_ethtool_sset:
234  * A generic ethtool sset function.  Handles all the details
235  *
236  * A few notes about parameter checking:
237  * - We don't set port or transceiver, so we don't care what they
238  *   were set to.
239  * - phy_start_aneg() will make sure forced settings are sane, and
240  *   choose the next best ones from the ones selected, so we don't
241  *   care if ethtool tries to give us bad values
242  *
243  */
244 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
245 {
246         if (cmd->phy_address != phydev->addr)
247                 return -EINVAL;
248
249         /* We make sure that we don't pass unsupported
250          * values in to the PHY */
251         cmd->advertising &= phydev->supported;
252
253         /* Verify the settings we care about. */
254         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
255                 return -EINVAL;
256
257         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
258                 return -EINVAL;
259
260         if (cmd->autoneg == AUTONEG_DISABLE
261                         && ((cmd->speed != SPEED_1000
262                                         && cmd->speed != SPEED_100
263                                         && cmd->speed != SPEED_10)
264                                 || (cmd->duplex != DUPLEX_HALF
265                                         && cmd->duplex != DUPLEX_FULL)))
266                 return -EINVAL;
267
268         phydev->autoneg = cmd->autoneg;
269
270         phydev->speed = cmd->speed;
271
272         phydev->advertising = cmd->advertising;
273
274         if (AUTONEG_ENABLE == cmd->autoneg)
275                 phydev->advertising |= ADVERTISED_Autoneg;
276         else
277                 phydev->advertising &= ~ADVERTISED_Autoneg;
278
279         phydev->duplex = cmd->duplex;
280
281         /* Restart the PHY */
282         phy_start_aneg(phydev);
283
284         return 0;
285 }
286
287 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
288 {
289         cmd->supported = phydev->supported;
290
291         cmd->advertising = phydev->advertising;
292
293         cmd->speed = phydev->speed;
294         cmd->duplex = phydev->duplex;
295         cmd->port = PORT_MII;
296         cmd->phy_address = phydev->addr;
297         cmd->transceiver = XCVR_EXTERNAL;
298         cmd->autoneg = phydev->autoneg;
299
300         return 0;
301 }
302
303
304 /* Note that this function is currently incompatible with the
305  * PHYCONTROL layer.  It changes registers without regard to
306  * current state.  Use at own risk
307  */
308 int phy_mii_ioctl(struct phy_device *phydev,
309                 struct mii_ioctl_data *mii_data, int cmd)
310 {
311         u16 val = mii_data->val_in;
312
313         switch (cmd) {
314         case SIOCGMIIPHY:
315                 mii_data->phy_id = phydev->addr;
316                 break;
317         case SIOCGMIIREG:
318                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
319                 break;
320
321         case SIOCSMIIREG:
322                 if (!capable(CAP_NET_ADMIN))
323                         return -EPERM;
324
325                 if (mii_data->phy_id == phydev->addr) {
326                         switch(mii_data->reg_num) {
327                         case MII_BMCR:
328                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
329                                         phydev->autoneg = AUTONEG_DISABLE;
330                                 else
331                                         phydev->autoneg = AUTONEG_ENABLE;
332                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
333                                         phydev->duplex = DUPLEX_FULL;
334                                 else
335                                         phydev->duplex = DUPLEX_HALF;
336                                 break;
337                         case MII_ADVERTISE:
338                                 phydev->advertising = val;
339                                 break;
340                         default:
341                                 /* do nothing */
342                                 break;
343                         }
344                 }
345
346                 phy_write(phydev, mii_data->reg_num, val);
347                 
348                 if (mii_data->reg_num == MII_BMCR 
349                                 && val & BMCR_RESET
350                                 && phydev->drv->config_init)
351                         phydev->drv->config_init(phydev);
352                 break;
353         }
354
355         return 0;
356 }
357
358 /* phy_start_aneg
359  *
360  * description: Sanitizes the settings (if we're not
361  *   autonegotiating them), and then calls the driver's
362  *   config_aneg function.  If the PHYCONTROL Layer is operating,
363  *   we change the state to reflect the beginning of
364  *   Auto-negotiation or forcing.
365  */
366 int phy_start_aneg(struct phy_device *phydev)
367 {
368         int err;
369
370         spin_lock(&phydev->lock);
371
372         if (AUTONEG_DISABLE == phydev->autoneg)
373                 phy_sanitize_settings(phydev);
374
375         err = phydev->drv->config_aneg(phydev);
376
377         if (err < 0)
378                 goto out_unlock;
379
380         if (phydev->state != PHY_HALTED) {
381                 if (AUTONEG_ENABLE == phydev->autoneg) {
382                         phydev->state = PHY_AN;
383                         phydev->link_timeout = PHY_AN_TIMEOUT;
384                 } else {
385                         phydev->state = PHY_FORCING;
386                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
387                 }
388         }
389
390 out_unlock:
391         spin_unlock(&phydev->lock);
392         return err;
393 }
394 EXPORT_SYMBOL(phy_start_aneg);
395
396
397 static void phy_change(void *data);
398 static void phy_timer(unsigned long data);
399
400 /* phy_start_machine:
401  *
402  * description: The PHY infrastructure can run a state machine
403  *   which tracks whether the PHY is starting up, negotiating,
404  *   etc.  This function starts the timer which tracks the state
405  *   of the PHY.  If you want to be notified when the state
406  *   changes, pass in the callback, otherwise, pass NULL.  If you
407  *   want to maintain your own state machine, do not call this
408  *   function. */
409 void phy_start_machine(struct phy_device *phydev,
410                 void (*handler)(struct net_device *))
411 {
412         phydev->adjust_state = handler;
413
414         init_timer(&phydev->phy_timer);
415         phydev->phy_timer.function = &phy_timer;
416         phydev->phy_timer.data = (unsigned long) phydev;
417         mod_timer(&phydev->phy_timer, jiffies + HZ);
418 }
419
420 /* phy_stop_machine
421  *
422  * description: Stops the state machine timer, sets the state to UP
423  *   (unless it wasn't up yet). This function must be called BEFORE
424  *   phy_detach.
425  */
426 void phy_stop_machine(struct phy_device *phydev)
427 {
428         del_timer_sync(&phydev->phy_timer);
429
430         spin_lock(&phydev->lock);
431         if (phydev->state > PHY_UP)
432                 phydev->state = PHY_UP;
433         spin_unlock(&phydev->lock);
434
435         phydev->adjust_state = NULL;
436 }
437
438 /* phy_force_reduction
439  *
440  * description: Reduces the speed/duplex settings by
441  *   one notch.  The order is so:
442  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
443  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
444  */
445 static void phy_force_reduction(struct phy_device *phydev)
446 {
447         int idx;
448
449         idx = phy_find_setting(phydev->speed, phydev->duplex);
450         
451         idx++;
452
453         idx = phy_find_valid(idx, phydev->supported);
454
455         phydev->speed = settings[idx].speed;
456         phydev->duplex = settings[idx].duplex;
457
458         pr_info("Trying %d/%s\n", phydev->speed,
459                         DUPLEX_FULL == phydev->duplex ?
460                         "FULL" : "HALF");
461 }
462
463
464 /* phy_error:
465  *
466  * Moves the PHY to the HALTED state in response to a read
467  * or write error, and tells the controller the link is down.
468  * Must not be called from interrupt context, or while the
469  * phydev->lock is held.
470  */
471 void phy_error(struct phy_device *phydev)
472 {
473         spin_lock(&phydev->lock);
474         phydev->state = PHY_HALTED;
475         spin_unlock(&phydev->lock);
476 }
477
478 /* phy_interrupt
479  *
480  * description: When a PHY interrupt occurs, the handler disables
481  * interrupts, and schedules a work task to clear the interrupt.
482  */
483 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
484 {
485         struct phy_device *phydev = phy_dat;
486
487         /* The MDIO bus is not allowed to be written in interrupt
488          * context, so we need to disable the irq here.  A work
489          * queue will write the PHY to disable and clear the
490          * interrupt, and then reenable the irq line. */
491         disable_irq_nosync(irq);
492
493         schedule_work(&phydev->phy_queue);
494
495         return IRQ_HANDLED;
496 }
497
498 /* Enable the interrupts from the PHY side */
499 int phy_enable_interrupts(struct phy_device *phydev)
500 {
501         int err;
502
503         err = phy_clear_interrupt(phydev);
504
505         if (err < 0)
506                 return err;
507
508         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
509
510         return err;
511 }
512 EXPORT_SYMBOL(phy_enable_interrupts);
513
514 /* Disable the PHY interrupts from the PHY side */
515 int phy_disable_interrupts(struct phy_device *phydev)
516 {
517         int err;
518
519         /* Disable PHY interrupts */
520         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
521
522         if (err)
523                 goto phy_err;
524
525         /* Clear the interrupt */
526         err = phy_clear_interrupt(phydev);
527
528         if (err)
529                 goto phy_err;
530
531         return 0;
532
533 phy_err:
534         phy_error(phydev);
535
536         return err;
537 }
538 EXPORT_SYMBOL(phy_disable_interrupts);
539
540 /* phy_start_interrupts
541  *
542  * description: Request the interrupt for the given PHY.  If
543  *   this fails, then we set irq to PHY_POLL.
544  *   Otherwise, we enable the interrupts in the PHY.
545  *   Returns 0 on success.
546  *   This should only be called with a valid IRQ number.
547  */
548 int phy_start_interrupts(struct phy_device *phydev)
549 {
550         int err = 0;
551
552         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
553
554         if (request_irq(phydev->irq, phy_interrupt,
555                                 IRQF_SHARED,
556                                 "phy_interrupt",
557                                 phydev) < 0) {
558                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
559                                 phydev->bus->name,
560                                 phydev->irq);
561                 phydev->irq = PHY_POLL;
562                 return 0;
563         }
564
565         err = phy_enable_interrupts(phydev);
566
567         return err;
568 }
569 EXPORT_SYMBOL(phy_start_interrupts);
570
571 int phy_stop_interrupts(struct phy_device *phydev)
572 {
573         int err;
574
575         err = phy_disable_interrupts(phydev);
576
577         if (err)
578                 phy_error(phydev);
579
580         free_irq(phydev->irq, phydev);
581
582         return err;
583 }
584 EXPORT_SYMBOL(phy_stop_interrupts);
585
586
587 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
588 static void phy_change(void *data)
589 {
590         int err;
591         struct phy_device *phydev = data;
592
593         err = phy_disable_interrupts(phydev);
594
595         if (err)
596                 goto phy_err;
597
598         spin_lock(&phydev->lock);
599         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
600                 phydev->state = PHY_CHANGELINK;
601         spin_unlock(&phydev->lock);
602
603         enable_irq(phydev->irq);
604
605         /* Reenable interrupts */
606         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
607
608         if (err)
609                 goto irq_enable_err;
610
611         return;
612
613 irq_enable_err:
614         disable_irq(phydev->irq);
615 phy_err:
616         phy_error(phydev);
617 }
618
619 /* Bring down the PHY link, and stop checking the status. */
620 void phy_stop(struct phy_device *phydev)
621 {
622         spin_lock(&phydev->lock);
623
624         if (PHY_HALTED == phydev->state)
625                 goto out_unlock;
626
627         if (phydev->irq != PHY_POLL) {
628                 /* Clear any pending interrupts */
629                 phy_clear_interrupt(phydev);
630
631                 /* Disable PHY Interrupts */
632                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
633         }
634
635         phydev->state = PHY_HALTED;
636
637 out_unlock:
638         spin_unlock(&phydev->lock);
639 }
640
641
642 /* phy_start
643  *
644  * description: Indicates the attached device's readiness to
645  *   handle PHY-related work.  Used during startup to start the
646  *   PHY, and after a call to phy_stop() to resume operation.
647  *   Also used to indicate the MDIO bus has cleared an error
648  *   condition.
649  */
650 void phy_start(struct phy_device *phydev)
651 {
652         spin_lock(&phydev->lock);
653
654         switch (phydev->state) {
655                 case PHY_STARTING:
656                         phydev->state = PHY_PENDING;
657                         break;
658                 case PHY_READY:
659                         phydev->state = PHY_UP;
660                         break;
661                 case PHY_HALTED:
662                         phydev->state = PHY_RESUMING;
663                 default:
664                         break;
665         }
666         spin_unlock(&phydev->lock);
667 }
668 EXPORT_SYMBOL(phy_stop);
669 EXPORT_SYMBOL(phy_start);
670
671 /* PHY timer which handles the state machine */
672 static void phy_timer(unsigned long data)
673 {
674         struct phy_device *phydev = (struct phy_device *)data;
675         int needs_aneg = 0;
676         int err = 0;
677
678         spin_lock(&phydev->lock);
679
680         if (phydev->adjust_state)
681                 phydev->adjust_state(phydev->attached_dev);
682
683         switch(phydev->state) {
684                 case PHY_DOWN:
685                 case PHY_STARTING:
686                 case PHY_READY:
687                 case PHY_PENDING:
688                         break;
689                 case PHY_UP:
690                         needs_aneg = 1;
691
692                         phydev->link_timeout = PHY_AN_TIMEOUT;
693
694                         break;
695                 case PHY_AN:
696                         /* Check if negotiation is done.  Break
697                          * if there's an error */
698                         err = phy_aneg_done(phydev);
699                         if (err < 0)
700                                 break;
701
702                         /* If auto-negotiation is done, we change to
703                          * either RUNNING, or NOLINK */
704                         if (err > 0) {
705                                 err = phy_read_status(phydev);
706
707                                 if (err)
708                                         break;
709
710                                 if (phydev->link) {
711                                         phydev->state = PHY_RUNNING;
712                                         netif_carrier_on(phydev->attached_dev);
713                                 } else {
714                                         phydev->state = PHY_NOLINK;
715                                         netif_carrier_off(phydev->attached_dev);
716                                 }
717
718                                 phydev->adjust_link(phydev->attached_dev);
719
720                         } else if (0 == phydev->link_timeout--) {
721                                 /* The counter expired, so either we
722                                  * switch to forced mode, or the
723                                  * magic_aneg bit exists, and we try aneg
724                                  * again */
725                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
726                                         int idx;
727
728                                         /* We'll start from the
729                                          * fastest speed, and work
730                                          * our way down */
731                                         idx = phy_find_valid(0,
732                                                         phydev->supported);
733
734                                         phydev->speed = settings[idx].speed;
735                                         phydev->duplex = settings[idx].duplex;
736                                         
737                                         phydev->autoneg = AUTONEG_DISABLE;
738                                         phydev->state = PHY_FORCING;
739                                         phydev->link_timeout =
740                                                 PHY_FORCE_TIMEOUT;
741
742                                         pr_info("Trying %d/%s\n",
743                                                         phydev->speed,
744                                                         DUPLEX_FULL ==
745                                                         phydev->duplex ?
746                                                         "FULL" : "HALF");
747                                 }
748
749                                 needs_aneg = 1;
750                         }
751                         break;
752                 case PHY_NOLINK:
753                         err = phy_read_status(phydev);
754
755                         if (err)
756                                 break;
757
758                         if (phydev->link) {
759                                 phydev->state = PHY_RUNNING;
760                                 netif_carrier_on(phydev->attached_dev);
761                                 phydev->adjust_link(phydev->attached_dev);
762                         }
763                         break;
764                 case PHY_FORCING:
765                         err = phy_read_status(phydev);
766
767                         if (err)
768                                 break;
769
770                         if (phydev->link) {
771                                 phydev->state = PHY_RUNNING;
772                                 netif_carrier_on(phydev->attached_dev);
773                         } else {
774                                 if (0 == phydev->link_timeout--) {
775                                         phy_force_reduction(phydev);
776                                         needs_aneg = 1;
777                                 }
778                         }
779
780                         phydev->adjust_link(phydev->attached_dev);
781                         break;
782                 case PHY_RUNNING:
783                         /* Only register a CHANGE if we are
784                          * polling */
785                         if (PHY_POLL == phydev->irq)
786                                 phydev->state = PHY_CHANGELINK;
787                         break;
788                 case PHY_CHANGELINK:
789                         err = phy_read_status(phydev);
790
791                         if (err)
792                                 break;
793
794                         if (phydev->link) {
795                                 phydev->state = PHY_RUNNING;
796                                 netif_carrier_on(phydev->attached_dev);
797                         } else {
798                                 phydev->state = PHY_NOLINK;
799                                 netif_carrier_off(phydev->attached_dev);
800                         }
801
802                         phydev->adjust_link(phydev->attached_dev);
803
804                         if (PHY_POLL != phydev->irq)
805                                 err = phy_config_interrupt(phydev,
806                                                 PHY_INTERRUPT_ENABLED);
807                         break;
808                 case PHY_HALTED:
809                         if (phydev->link) {
810                                 phydev->link = 0;
811                                 netif_carrier_off(phydev->attached_dev);
812                                 phydev->adjust_link(phydev->attached_dev);
813                         }
814                         break;
815                 case PHY_RESUMING:
816
817                         err = phy_clear_interrupt(phydev);
818
819                         if (err)
820                                 break;
821
822                         err = phy_config_interrupt(phydev,
823                                         PHY_INTERRUPT_ENABLED);
824
825                         if (err)
826                                 break;
827
828                         if (AUTONEG_ENABLE == phydev->autoneg) {
829                                 err = phy_aneg_done(phydev);
830                                 if (err < 0)
831                                         break;
832
833                                 /* err > 0 if AN is done.
834                                  * Otherwise, it's 0, and we're
835                                  * still waiting for AN */
836                                 if (err > 0) {
837                                         phydev->state = PHY_RUNNING;
838                                 } else {
839                                         phydev->state = PHY_AN;
840                                         phydev->link_timeout = PHY_AN_TIMEOUT;
841                                 }
842                         } else
843                                 phydev->state = PHY_RUNNING;
844                         break;
845         }
846
847         spin_unlock(&phydev->lock);
848
849         if (needs_aneg)
850                 err = phy_start_aneg(phydev);
851
852         if (err < 0)
853                 phy_error(phydev);
854
855         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
856 }
857