Pull bugzilla-7200 into release branch
[linux-2.6] / 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  * Copyright (c) 2006  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/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 #include <linux/timer.h>
36 #include <linux/workqueue.h>
37
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/uaccess.h>
41
42 /* Convenience function to print out the current phy status
43  */
44 void phy_print_status(struct phy_device *phydev)
45 {
46         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
47                         phydev->link ? "Up" : "Down");
48         if (phydev->link)
49                 printk(" - %d/%s", phydev->speed,
50                                 DUPLEX_FULL == phydev->duplex ?
51                                 "Full" : "Half");
52
53         printk("\n");
54 }
55 EXPORT_SYMBOL(phy_print_status);
56
57
58 /* Convenience functions for reading/writing a given PHY
59  * register. They MUST NOT be called from interrupt context,
60  * because the bus read/write functions may wait for an interrupt
61  * to conclude the operation. */
62 int phy_read(struct phy_device *phydev, u16 regnum)
63 {
64         int retval;
65         struct mii_bus *bus = phydev->bus;
66
67         spin_lock_bh(&bus->mdio_lock);
68         retval = bus->read(bus, phydev->addr, regnum);
69         spin_unlock_bh(&bus->mdio_lock);
70
71         return retval;
72 }
73 EXPORT_SYMBOL(phy_read);
74
75 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
76 {
77         int err;
78         struct mii_bus *bus = phydev->bus;
79
80         spin_lock_bh(&bus->mdio_lock);
81         err = bus->write(bus, phydev->addr, regnum, val);
82         spin_unlock_bh(&bus->mdio_lock);
83
84         return err;
85 }
86 EXPORT_SYMBOL(phy_write);
87
88
89 int phy_clear_interrupt(struct phy_device *phydev)
90 {
91         int err = 0;
92
93         if (phydev->drv->ack_interrupt)
94                 err = phydev->drv->ack_interrupt(phydev);
95
96         return err;
97 }
98
99
100 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
101 {
102         int err = 0;
103
104         phydev->interrupts = interrupts;
105         if (phydev->drv->config_intr)
106                 err = phydev->drv->config_intr(phydev);
107
108         return err;
109 }
110
111
112 /* phy_aneg_done
113  *
114  * description: Reads the status register and returns 0 either if
115  *   auto-negotiation is incomplete, or if there was an error.
116  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
117  */
118 static inline int phy_aneg_done(struct phy_device *phydev)
119 {
120         int retval;
121
122         retval = phy_read(phydev, MII_BMSR);
123
124         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
125 }
126
127 /* A structure for mapping a particular speed and duplex
128  * combination to a particular SUPPORTED and ADVERTISED value */
129 struct phy_setting {
130         int speed;
131         int duplex;
132         u32 setting;
133 };
134
135 /* A mapping of all SUPPORTED settings to speed/duplex */
136 static const struct phy_setting settings[] = {
137         {
138                 .speed = 10000,
139                 .duplex = DUPLEX_FULL,
140                 .setting = SUPPORTED_10000baseT_Full,
141         },
142         {
143                 .speed = SPEED_1000,
144                 .duplex = DUPLEX_FULL,
145                 .setting = SUPPORTED_1000baseT_Full,
146         },
147         {
148                 .speed = SPEED_1000,
149                 .duplex = DUPLEX_HALF,
150                 .setting = SUPPORTED_1000baseT_Half,
151         },
152         {
153                 .speed = SPEED_100,
154                 .duplex = DUPLEX_FULL,
155                 .setting = SUPPORTED_100baseT_Full,
156         },
157         {
158                 .speed = SPEED_100,
159                 .duplex = DUPLEX_HALF,
160                 .setting = SUPPORTED_100baseT_Half,
161         },
162         {
163                 .speed = SPEED_10,
164                 .duplex = DUPLEX_FULL,
165                 .setting = SUPPORTED_10baseT_Full,
166         },
167         {
168                 .speed = SPEED_10,
169                 .duplex = DUPLEX_HALF,
170                 .setting = SUPPORTED_10baseT_Half,
171         },
172 };
173
174 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
175
176 /* phy_find_setting
177  *
178  * description: Searches the settings array for the setting which
179  *   matches the desired speed and duplex, and returns the index
180  *   of that setting.  Returns the index of the last setting if
181  *   none of the others match.
182  */
183 static inline int phy_find_setting(int speed, int duplex)
184 {
185         int idx = 0;
186
187         while (idx < ARRAY_SIZE(settings) &&
188                         (settings[idx].speed != speed ||
189                         settings[idx].duplex != duplex))
190                 idx++;
191
192         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
193 }
194
195 /* phy_find_valid
196  * idx: The first index in settings[] to search
197  * features: A mask of the valid settings
198  *
199  * description: Returns the index of the first valid setting less
200  *   than or equal to the one pointed to by idx, as determined by
201  *   the mask in features.  Returns the index of the last setting
202  *   if nothing else matches.
203  */
204 static inline int phy_find_valid(int idx, u32 features)
205 {
206         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
207                 idx++;
208
209         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
210 }
211
212 /* phy_sanitize_settings
213  *
214  * description: Make sure the PHY is set to supported speeds and
215  *   duplexes.  Drop down by one in this order:  1000/FULL,
216  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
217  */
218 void phy_sanitize_settings(struct phy_device *phydev)
219 {
220         u32 features = phydev->supported;
221         int idx;
222
223         /* Sanitize settings based on PHY capabilities */
224         if ((features & SUPPORTED_Autoneg) == 0)
225                 phydev->autoneg = 0;
226
227         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
228                         features);
229
230         phydev->speed = settings[idx].speed;
231         phydev->duplex = settings[idx].duplex;
232 }
233 EXPORT_SYMBOL(phy_sanitize_settings);
234
235 /* phy_ethtool_sset:
236  * A generic ethtool sset function.  Handles all the details
237  *
238  * A few notes about parameter checking:
239  * - We don't set port or transceiver, so we don't care what they
240  *   were set to.
241  * - phy_start_aneg() will make sure forced settings are sane, and
242  *   choose the next best ones from the ones selected, so we don't
243  *   care if ethtool tries to give us bad values
244  *
245  */
246 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
247 {
248         if (cmd->phy_address != phydev->addr)
249                 return -EINVAL;
250
251         /* We make sure that we don't pass unsupported
252          * values in to the PHY */
253         cmd->advertising &= phydev->supported;
254
255         /* Verify the settings we care about. */
256         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
257                 return -EINVAL;
258
259         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
260                 return -EINVAL;
261
262         if (cmd->autoneg == AUTONEG_DISABLE
263                         && ((cmd->speed != SPEED_1000
264                                         && cmd->speed != SPEED_100
265                                         && cmd->speed != SPEED_10)
266                                 || (cmd->duplex != DUPLEX_HALF
267                                         && cmd->duplex != DUPLEX_FULL)))
268                 return -EINVAL;
269
270         phydev->autoneg = cmd->autoneg;
271
272         phydev->speed = cmd->speed;
273
274         phydev->advertising = cmd->advertising;
275
276         if (AUTONEG_ENABLE == cmd->autoneg)
277                 phydev->advertising |= ADVERTISED_Autoneg;
278         else
279                 phydev->advertising &= ~ADVERTISED_Autoneg;
280
281         phydev->duplex = cmd->duplex;
282
283         /* Restart the PHY */
284         phy_start_aneg(phydev);
285
286         return 0;
287 }
288 EXPORT_SYMBOL(phy_ethtool_sset);
289
290 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
291 {
292         cmd->supported = phydev->supported;
293
294         cmd->advertising = phydev->advertising;
295
296         cmd->speed = phydev->speed;
297         cmd->duplex = phydev->duplex;
298         cmd->port = PORT_MII;
299         cmd->phy_address = phydev->addr;
300         cmd->transceiver = XCVR_EXTERNAL;
301         cmd->autoneg = phydev->autoneg;
302
303         return 0;
304 }
305 EXPORT_SYMBOL(phy_ethtool_gset);
306
307 /* Note that this function is currently incompatible with the
308  * PHYCONTROL layer.  It changes registers without regard to
309  * current state.  Use at own risk
310  */
311 int phy_mii_ioctl(struct phy_device *phydev,
312                 struct mii_ioctl_data *mii_data, int cmd)
313 {
314         u16 val = mii_data->val_in;
315
316         switch (cmd) {
317         case SIOCGMIIPHY:
318                 mii_data->phy_id = phydev->addr;
319                 break;
320         case SIOCGMIIREG:
321                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
322                 break;
323
324         case SIOCSMIIREG:
325                 if (!capable(CAP_NET_ADMIN))
326                         return -EPERM;
327
328                 if (mii_data->phy_id == phydev->addr) {
329                         switch(mii_data->reg_num) {
330                         case MII_BMCR:
331                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
332                                         phydev->autoneg = AUTONEG_DISABLE;
333                                 else
334                                         phydev->autoneg = AUTONEG_ENABLE;
335                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
336                                         phydev->duplex = DUPLEX_FULL;
337                                 else
338                                         phydev->duplex = DUPLEX_HALF;
339                                 break;
340                         case MII_ADVERTISE:
341                                 phydev->advertising = val;
342                                 break;
343                         default:
344                                 /* do nothing */
345                                 break;
346                         }
347                 }
348
349                 phy_write(phydev, mii_data->reg_num, val);
350                 
351                 if (mii_data->reg_num == MII_BMCR 
352                                 && val & BMCR_RESET
353                                 && phydev->drv->config_init)
354                         phydev->drv->config_init(phydev);
355                 break;
356         }
357
358         return 0;
359 }
360
361 /* phy_start_aneg
362  *
363  * description: Sanitizes the settings (if we're not
364  *   autonegotiating them), and then calls the driver's
365  *   config_aneg function.  If the PHYCONTROL Layer is operating,
366  *   we change the state to reflect the beginning of
367  *   Auto-negotiation or forcing.
368  */
369 int phy_start_aneg(struct phy_device *phydev)
370 {
371         int err;
372
373         spin_lock(&phydev->lock);
374
375         if (AUTONEG_DISABLE == phydev->autoneg)
376                 phy_sanitize_settings(phydev);
377
378         err = phydev->drv->config_aneg(phydev);
379
380         if (err < 0)
381                 goto out_unlock;
382
383         if (phydev->state != PHY_HALTED) {
384                 if (AUTONEG_ENABLE == phydev->autoneg) {
385                         phydev->state = PHY_AN;
386                         phydev->link_timeout = PHY_AN_TIMEOUT;
387                 } else {
388                         phydev->state = PHY_FORCING;
389                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
390                 }
391         }
392
393 out_unlock:
394         spin_unlock(&phydev->lock);
395         return err;
396 }
397 EXPORT_SYMBOL(phy_start_aneg);
398
399
400 static void phy_change(struct work_struct *work);
401 static void phy_timer(unsigned long data);
402
403 /* phy_start_machine:
404  *
405  * description: The PHY infrastructure can run a state machine
406  *   which tracks whether the PHY is starting up, negotiating,
407  *   etc.  This function starts the timer which tracks the state
408  *   of the PHY.  If you want to be notified when the state
409  *   changes, pass in the callback, otherwise, pass NULL.  If you
410  *   want to maintain your own state machine, do not call this
411  *   function. */
412 void phy_start_machine(struct phy_device *phydev,
413                 void (*handler)(struct net_device *))
414 {
415         phydev->adjust_state = handler;
416
417         init_timer(&phydev->phy_timer);
418         phydev->phy_timer.function = &phy_timer;
419         phydev->phy_timer.data = (unsigned long) phydev;
420         mod_timer(&phydev->phy_timer, jiffies + HZ);
421 }
422
423 /* phy_stop_machine
424  *
425  * description: Stops the state machine timer, sets the state to UP
426  *   (unless it wasn't up yet). This function must be called BEFORE
427  *   phy_detach.
428  */
429 void phy_stop_machine(struct phy_device *phydev)
430 {
431         del_timer_sync(&phydev->phy_timer);
432
433         spin_lock(&phydev->lock);
434         if (phydev->state > PHY_UP)
435                 phydev->state = PHY_UP;
436         spin_unlock(&phydev->lock);
437
438         phydev->adjust_state = NULL;
439 }
440
441 /* phy_force_reduction
442  *
443  * description: Reduces the speed/duplex settings by
444  *   one notch.  The order is so:
445  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
446  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
447  */
448 static void phy_force_reduction(struct phy_device *phydev)
449 {
450         int idx;
451
452         idx = phy_find_setting(phydev->speed, phydev->duplex);
453         
454         idx++;
455
456         idx = phy_find_valid(idx, phydev->supported);
457
458         phydev->speed = settings[idx].speed;
459         phydev->duplex = settings[idx].duplex;
460
461         pr_info("Trying %d/%s\n", phydev->speed,
462                         DUPLEX_FULL == phydev->duplex ?
463                         "FULL" : "HALF");
464 }
465
466
467 /* phy_error:
468  *
469  * Moves the PHY to the HALTED state in response to a read
470  * or write error, and tells the controller the link is down.
471  * Must not be called from interrupt context, or while the
472  * phydev->lock is held.
473  */
474 void phy_error(struct phy_device *phydev)
475 {
476         spin_lock(&phydev->lock);
477         phydev->state = PHY_HALTED;
478         spin_unlock(&phydev->lock);
479 }
480
481 /* phy_interrupt
482  *
483  * description: When a PHY interrupt occurs, the handler disables
484  * interrupts, and schedules a work task to clear the interrupt.
485  */
486 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
487 {
488         struct phy_device *phydev = phy_dat;
489
490         if (PHY_HALTED == phydev->state)
491                 return IRQ_NONE;                /* It can't be ours.  */
492
493         /* The MDIO bus is not allowed to be written in interrupt
494          * context, so we need to disable the irq here.  A work
495          * queue will write the PHY to disable and clear the
496          * interrupt, and then reenable the irq line. */
497         disable_irq_nosync(irq);
498
499         schedule_work(&phydev->phy_queue);
500
501         return IRQ_HANDLED;
502 }
503
504 /* Enable the interrupts from the PHY side */
505 int phy_enable_interrupts(struct phy_device *phydev)
506 {
507         int err;
508
509         err = phy_clear_interrupt(phydev);
510
511         if (err < 0)
512                 return err;
513
514         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
515
516         return err;
517 }
518 EXPORT_SYMBOL(phy_enable_interrupts);
519
520 /* Disable the PHY interrupts from the PHY side */
521 int phy_disable_interrupts(struct phy_device *phydev)
522 {
523         int err;
524
525         /* Disable PHY interrupts */
526         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
527
528         if (err)
529                 goto phy_err;
530
531         /* Clear the interrupt */
532         err = phy_clear_interrupt(phydev);
533
534         if (err)
535                 goto phy_err;
536
537         return 0;
538
539 phy_err:
540         phy_error(phydev);
541
542         return err;
543 }
544 EXPORT_SYMBOL(phy_disable_interrupts);
545
546 /* phy_start_interrupts
547  *
548  * description: Request the interrupt for the given PHY.  If
549  *   this fails, then we set irq to PHY_POLL.
550  *   Otherwise, we enable the interrupts in the PHY.
551  *   Returns 0 on success.
552  *   This should only be called with a valid IRQ number.
553  */
554 int phy_start_interrupts(struct phy_device *phydev)
555 {
556         int err = 0;
557
558         INIT_WORK(&phydev->phy_queue, phy_change);
559
560         if (request_irq(phydev->irq, phy_interrupt,
561                                 IRQF_SHARED,
562                                 "phy_interrupt",
563                                 phydev) < 0) {
564                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
565                                 phydev->bus->name,
566                                 phydev->irq);
567                 phydev->irq = PHY_POLL;
568                 return 0;
569         }
570
571         err = phy_enable_interrupts(phydev);
572
573         return err;
574 }
575 EXPORT_SYMBOL(phy_start_interrupts);
576
577 int phy_stop_interrupts(struct phy_device *phydev)
578 {
579         int err;
580
581         err = phy_disable_interrupts(phydev);
582
583         if (err)
584                 phy_error(phydev);
585
586         /*
587          * Finish any pending work; we might have been scheduled
588          * to be called from keventd ourselves, though.
589          */
590         run_scheduled_work(&phydev->phy_queue);
591
592         free_irq(phydev->irq, phydev);
593
594         return err;
595 }
596 EXPORT_SYMBOL(phy_stop_interrupts);
597
598
599 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
600 static void phy_change(struct work_struct *work)
601 {
602         int err;
603         struct phy_device *phydev =
604                 container_of(work, struct phy_device, phy_queue);
605
606         err = phy_disable_interrupts(phydev);
607
608         if (err)
609                 goto phy_err;
610
611         spin_lock(&phydev->lock);
612         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
613                 phydev->state = PHY_CHANGELINK;
614         spin_unlock(&phydev->lock);
615
616         enable_irq(phydev->irq);
617
618         /* Reenable interrupts */
619         if (PHY_HALTED != phydev->state)
620                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
621
622         if (err)
623                 goto irq_enable_err;
624
625         return;
626
627 irq_enable_err:
628         disable_irq(phydev->irq);
629 phy_err:
630         phy_error(phydev);
631 }
632
633 /* Bring down the PHY link, and stop checking the status. */
634 void phy_stop(struct phy_device *phydev)
635 {
636         spin_lock(&phydev->lock);
637
638         if (PHY_HALTED == phydev->state)
639                 goto out_unlock;
640
641         phydev->state = PHY_HALTED;
642
643         if (phydev->irq != PHY_POLL) {
644                 /* Disable PHY Interrupts */
645                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
646
647                 /* Clear any pending interrupts */
648                 phy_clear_interrupt(phydev);
649         }
650
651 out_unlock:
652         spin_unlock(&phydev->lock);
653
654         /*
655          * Cannot call flush_scheduled_work() here as desired because
656          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
657          * will not reenable interrupts.
658          */
659 }
660
661
662 /* phy_start
663  *
664  * description: Indicates the attached device's readiness to
665  *   handle PHY-related work.  Used during startup to start the
666  *   PHY, and after a call to phy_stop() to resume operation.
667  *   Also used to indicate the MDIO bus has cleared an error
668  *   condition.
669  */
670 void phy_start(struct phy_device *phydev)
671 {
672         spin_lock(&phydev->lock);
673
674         switch (phydev->state) {
675                 case PHY_STARTING:
676                         phydev->state = PHY_PENDING;
677                         break;
678                 case PHY_READY:
679                         phydev->state = PHY_UP;
680                         break;
681                 case PHY_HALTED:
682                         phydev->state = PHY_RESUMING;
683                 default:
684                         break;
685         }
686         spin_unlock(&phydev->lock);
687 }
688 EXPORT_SYMBOL(phy_stop);
689 EXPORT_SYMBOL(phy_start);
690
691 /* PHY timer which handles the state machine */
692 static void phy_timer(unsigned long data)
693 {
694         struct phy_device *phydev = (struct phy_device *)data;
695         int needs_aneg = 0;
696         int err = 0;
697
698         spin_lock(&phydev->lock);
699
700         if (phydev->adjust_state)
701                 phydev->adjust_state(phydev->attached_dev);
702
703         switch(phydev->state) {
704                 case PHY_DOWN:
705                 case PHY_STARTING:
706                 case PHY_READY:
707                 case PHY_PENDING:
708                         break;
709                 case PHY_UP:
710                         needs_aneg = 1;
711
712                         phydev->link_timeout = PHY_AN_TIMEOUT;
713
714                         break;
715                 case PHY_AN:
716                         err = phy_read_status(phydev);
717
718                         if (err < 0)
719                                 break;
720
721                         /* If the link is down, give up on
722                          * negotiation for now */
723                         if (!phydev->link) {
724                                 phydev->state = PHY_NOLINK;
725                                 netif_carrier_off(phydev->attached_dev);
726                                 phydev->adjust_link(phydev->attached_dev);
727                                 break;
728                         }
729
730                         /* Check if negotiation is done.  Break
731                          * if there's an error */
732                         err = phy_aneg_done(phydev);
733                         if (err < 0)
734                                 break;
735
736                         /* If AN is done, we're running */
737                         if (err > 0) {
738                                 phydev->state = PHY_RUNNING;
739                                 netif_carrier_on(phydev->attached_dev);
740                                 phydev->adjust_link(phydev->attached_dev);
741
742                         } else if (0 == phydev->link_timeout--) {
743                                 int idx;
744
745                                 needs_aneg = 1;
746                                 /* If we have the magic_aneg bit,
747                                  * we try again */
748                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
749                                         break;
750
751                                 /* The timer expired, and we still
752                                  * don't have a setting, so we try
753                                  * forcing it until we find one that
754                                  * works, starting from the fastest speed,
755                                  * and working our way down */
756                                 idx = phy_find_valid(0, phydev->supported);
757
758                                 phydev->speed = settings[idx].speed;
759                                 phydev->duplex = settings[idx].duplex;
760
761                                 phydev->autoneg = AUTONEG_DISABLE;
762
763                                 pr_info("Trying %d/%s\n", phydev->speed,
764                                                 DUPLEX_FULL ==
765                                                 phydev->duplex ?
766                                                 "FULL" : "HALF");
767                         }
768                         break;
769                 case PHY_NOLINK:
770                         err = phy_read_status(phydev);
771
772                         if (err)
773                                 break;
774
775                         if (phydev->link) {
776                                 phydev->state = PHY_RUNNING;
777                                 netif_carrier_on(phydev->attached_dev);
778                                 phydev->adjust_link(phydev->attached_dev);
779                         }
780                         break;
781                 case PHY_FORCING:
782                         err = genphy_update_link(phydev);
783
784                         if (err)
785                                 break;
786
787                         if (phydev->link) {
788                                 phydev->state = PHY_RUNNING;
789                                 netif_carrier_on(phydev->attached_dev);
790                         } else {
791                                 if (0 == phydev->link_timeout--) {
792                                         phy_force_reduction(phydev);
793                                         needs_aneg = 1;
794                                 }
795                         }
796
797                         phydev->adjust_link(phydev->attached_dev);
798                         break;
799                 case PHY_RUNNING:
800                         /* Only register a CHANGE if we are
801                          * polling */
802                         if (PHY_POLL == phydev->irq)
803                                 phydev->state = PHY_CHANGELINK;
804                         break;
805                 case PHY_CHANGELINK:
806                         err = phy_read_status(phydev);
807
808                         if (err)
809                                 break;
810
811                         if (phydev->link) {
812                                 phydev->state = PHY_RUNNING;
813                                 netif_carrier_on(phydev->attached_dev);
814                         } else {
815                                 phydev->state = PHY_NOLINK;
816                                 netif_carrier_off(phydev->attached_dev);
817                         }
818
819                         phydev->adjust_link(phydev->attached_dev);
820
821                         if (PHY_POLL != phydev->irq)
822                                 err = phy_config_interrupt(phydev,
823                                                 PHY_INTERRUPT_ENABLED);
824                         break;
825                 case PHY_HALTED:
826                         if (phydev->link) {
827                                 phydev->link = 0;
828                                 netif_carrier_off(phydev->attached_dev);
829                                 phydev->adjust_link(phydev->attached_dev);
830                         }
831                         break;
832                 case PHY_RESUMING:
833
834                         err = phy_clear_interrupt(phydev);
835
836                         if (err)
837                                 break;
838
839                         err = phy_config_interrupt(phydev,
840                                         PHY_INTERRUPT_ENABLED);
841
842                         if (err)
843                                 break;
844
845                         if (AUTONEG_ENABLE == phydev->autoneg) {
846                                 err = phy_aneg_done(phydev);
847                                 if (err < 0)
848                                         break;
849
850                                 /* err > 0 if AN is done.
851                                  * Otherwise, it's 0, and we're
852                                  * still waiting for AN */
853                                 if (err > 0) {
854                                         phydev->state = PHY_RUNNING;
855                                 } else {
856                                         phydev->state = PHY_AN;
857                                         phydev->link_timeout = PHY_AN_TIMEOUT;
858                                 }
859                         } else
860                                 phydev->state = PHY_RUNNING;
861                         break;
862         }
863
864         spin_unlock(&phydev->lock);
865
866         if (needs_aneg)
867                 err = phy_start_aneg(phydev);
868
869         if (err < 0)
870                 phy_error(phydev);
871
872         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
873 }
874