a8445c72fc13aeb7066c3f1a2b930126935c2bda
[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  * 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 <asm/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  */
45 void 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 }
56 EXPORT_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  */
68 static 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  */
85 static 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  */
105 static 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 */
116 struct phy_setting {
117         int speed;
118         int duplex;
119         u32 setting;
120 };
121
122 /* A mapping of all SUPPORTED settings to speed/duplex */
123 static 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  */
173 static 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  */
195 static 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  */
211 static 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  */
239 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
240 {
241         if (cmd->phy_address != phydev->addr)
242                 return -EINVAL;
243
244         /* We make sure that we don't pass unsupported
245          * values in to the PHY */
246         cmd->advertising &= phydev->supported;
247
248         /* Verify the settings we care about. */
249         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
250                 return -EINVAL;
251
252         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
253                 return -EINVAL;
254
255         if (cmd->autoneg == AUTONEG_DISABLE &&
256             ((cmd->speed != SPEED_1000 &&
257               cmd->speed != SPEED_100 &&
258               cmd->speed != SPEED_10) ||
259              (cmd->duplex != DUPLEX_HALF &&
260               cmd->duplex != DUPLEX_FULL)))
261                 return -EINVAL;
262
263         phydev->autoneg = cmd->autoneg;
264
265         phydev->speed = cmd->speed;
266
267         phydev->advertising = cmd->advertising;
268
269         if (AUTONEG_ENABLE == cmd->autoneg)
270                 phydev->advertising |= ADVERTISED_Autoneg;
271         else
272                 phydev->advertising &= ~ADVERTISED_Autoneg;
273
274         phydev->duplex = cmd->duplex;
275
276         /* Restart the PHY */
277         phy_start_aneg(phydev);
278
279         return 0;
280 }
281 EXPORT_SYMBOL(phy_ethtool_sset);
282
283 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
284 {
285         cmd->supported = phydev->supported;
286
287         cmd->advertising = phydev->advertising;
288
289         cmd->speed = phydev->speed;
290         cmd->duplex = phydev->duplex;
291         cmd->port = PORT_MII;
292         cmd->phy_address = phydev->addr;
293         cmd->transceiver = XCVR_EXTERNAL;
294         cmd->autoneg = phydev->autoneg;
295
296         return 0;
297 }
298 EXPORT_SYMBOL(phy_ethtool_gset);
299
300 /**
301  * phy_mii_ioctl - generic PHY MII ioctl interface
302  * @phydev: the phy_device struct
303  * @ifr: &struct ifreq for socket ioctl's
304  * @cmd: ioctl cmd to execute
305  *
306  * Note that this function is currently incompatible with the
307  * PHYCONTROL layer.  It changes registers without regard to
308  * current state.  Use at own risk.
309  */
310 int phy_mii_ioctl(struct phy_device *phydev,
311                 struct ifreq *ifr, int cmd)
312 {
313         struct mii_ioctl_data *mii_data = if_mii(ifr);
314         u16 val = mii_data->val_in;
315
316         switch (cmd) {
317         case SIOCGMIIPHY:
318                 mii_data->phy_id = phydev->addr;
319                 /* fall through */
320
321         case SIOCGMIIREG:
322                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
323                 break;
324
325         case SIOCSMIIREG:
326                 if (mii_data->phy_id == phydev->addr) {
327                         switch(mii_data->reg_num) {
328                         case MII_BMCR:
329                                 if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
330                                         phydev->autoneg = AUTONEG_DISABLE;
331                                 else
332                                         phydev->autoneg = AUTONEG_ENABLE;
333                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
334                                         phydev->duplex = DUPLEX_FULL;
335                                 else
336                                         phydev->duplex = DUPLEX_HALF;
337                                 if ((!phydev->autoneg) &&
338                                                 (val & BMCR_SPEED1000))
339                                         phydev->speed = SPEED_1000;
340                                 else if ((!phydev->autoneg) &&
341                                                 (val & BMCR_SPEED100))
342                                         phydev->speed = SPEED_100;
343                                 break;
344                         case MII_ADVERTISE:
345                                 phydev->advertising = val;
346                                 break;
347                         default:
348                                 /* do nothing */
349                                 break;
350                         }
351                 }
352
353                 phy_write(phydev, mii_data->reg_num, val);
354                 
355                 if (mii_data->reg_num == MII_BMCR &&
356                     val & BMCR_RESET &&
357                     phydev->drv->config_init) {
358                         phy_scan_fixups(phydev);
359                         phydev->drv->config_init(phydev);
360                 }
361                 break;
362
363         case SIOCSHWTSTAMP:
364                 if (phydev->drv->hwtstamp)
365                         return phydev->drv->hwtstamp(phydev, ifr);
366                 /* fall through */
367
368         default:
369                 return -EOPNOTSUPP;
370         }
371
372         return 0;
373 }
374 EXPORT_SYMBOL(phy_mii_ioctl);
375
376 /**
377  * phy_start_aneg - start auto-negotiation for this PHY device
378  * @phydev: the phy_device struct
379  *
380  * Description: Sanitizes the settings (if we're not autonegotiating
381  *   them), and then calls the driver's config_aneg function.
382  *   If the PHYCONTROL Layer is operating, we change the state to
383  *   reflect the beginning of Auto-negotiation or forcing.
384  */
385 int phy_start_aneg(struct phy_device *phydev)
386 {
387         int err;
388
389         mutex_lock(&phydev->lock);
390
391         if (AUTONEG_DISABLE == phydev->autoneg)
392                 phy_sanitize_settings(phydev);
393
394         err = phydev->drv->config_aneg(phydev);
395
396         if (err < 0)
397                 goto out_unlock;
398
399         if (phydev->state != PHY_HALTED) {
400                 if (AUTONEG_ENABLE == phydev->autoneg) {
401                         phydev->state = PHY_AN;
402                         phydev->link_timeout = PHY_AN_TIMEOUT;
403                 } else {
404                         phydev->state = PHY_FORCING;
405                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
406                 }
407         }
408
409 out_unlock:
410         mutex_unlock(&phydev->lock);
411         return err;
412 }
413 EXPORT_SYMBOL(phy_start_aneg);
414
415
416 static void phy_change(struct work_struct *work);
417
418 /**
419  * phy_start_machine - start PHY state machine tracking
420  * @phydev: the phy_device struct
421  * @handler: callback function for state change notifications
422  *
423  * Description: The PHY infrastructure can run a state machine
424  *   which tracks whether the PHY is starting up, negotiating,
425  *   etc.  This function starts the timer which tracks the state
426  *   of the PHY.  If you want to be notified when the state changes,
427  *   pass in the callback @handler, otherwise, pass NULL.  If you
428  *   want to maintain your own state machine, do not call this
429  *   function.
430  */
431 void phy_start_machine(struct phy_device *phydev,
432                 void (*handler)(struct net_device *))
433 {
434         phydev->adjust_state = handler;
435
436         schedule_delayed_work(&phydev->state_queue, HZ);
437 }
438
439 /**
440  * phy_stop_machine - stop the PHY state machine tracking
441  * @phydev: target phy_device struct
442  *
443  * Description: Stops the state machine timer, sets the state to UP
444  *   (unless it wasn't up yet). This function must be called BEFORE
445  *   phy_detach.
446  */
447 void phy_stop_machine(struct phy_device *phydev)
448 {
449         cancel_delayed_work_sync(&phydev->state_queue);
450
451         mutex_lock(&phydev->lock);
452         if (phydev->state > PHY_UP)
453                 phydev->state = PHY_UP;
454         mutex_unlock(&phydev->lock);
455
456         phydev->adjust_state = NULL;
457 }
458
459 /**
460  * phy_force_reduction - reduce PHY speed/duplex settings by one step
461  * @phydev: target phy_device struct
462  *
463  * Description: Reduces the speed/duplex settings by one notch,
464  *   in this order--
465  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
466  *   The function bottoms out at 10/HALF.
467  */
468 static void phy_force_reduction(struct phy_device *phydev)
469 {
470         int idx;
471
472         idx = phy_find_setting(phydev->speed, phydev->duplex);
473         
474         idx++;
475
476         idx = phy_find_valid(idx, phydev->supported);
477
478         phydev->speed = settings[idx].speed;
479         phydev->duplex = settings[idx].duplex;
480
481         pr_info("Trying %d/%s\n", phydev->speed,
482                         DUPLEX_FULL == phydev->duplex ?
483                         "FULL" : "HALF");
484 }
485
486
487 /**
488  * phy_error - enter HALTED state for this PHY device
489  * @phydev: target phy_device struct
490  *
491  * Moves the PHY to the HALTED state in response to a read
492  * or write error, and tells the controller the link is down.
493  * Must not be called from interrupt context, or while the
494  * phydev->lock is held.
495  */
496 static void phy_error(struct phy_device *phydev)
497 {
498         mutex_lock(&phydev->lock);
499         phydev->state = PHY_HALTED;
500         mutex_unlock(&phydev->lock);
501 }
502
503 /**
504  * phy_interrupt - PHY interrupt handler
505  * @irq: interrupt line
506  * @phy_dat: phy_device pointer
507  *
508  * Description: When a PHY interrupt occurs, the handler disables
509  * interrupts, and schedules a work task to clear the interrupt.
510  */
511 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
512 {
513         struct phy_device *phydev = phy_dat;
514
515         if (PHY_HALTED == phydev->state)
516                 return IRQ_NONE;                /* It can't be ours.  */
517
518         /* The MDIO bus is not allowed to be written in interrupt
519          * context, so we need to disable the irq here.  A work
520          * queue will write the PHY to disable and clear the
521          * interrupt, and then reenable the irq line. */
522         disable_irq_nosync(irq);
523         atomic_inc(&phydev->irq_disable);
524
525         schedule_work(&phydev->phy_queue);
526
527         return IRQ_HANDLED;
528 }
529
530 /**
531  * phy_enable_interrupts - Enable the interrupts from the PHY side
532  * @phydev: target phy_device struct
533  */
534 static int phy_enable_interrupts(struct phy_device *phydev)
535 {
536         int err;
537
538         err = phy_clear_interrupt(phydev);
539
540         if (err < 0)
541                 return err;
542
543         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
544
545         return err;
546 }
547
548 /**
549  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
550  * @phydev: target phy_device struct
551  */
552 static int phy_disable_interrupts(struct phy_device *phydev)
553 {
554         int err;
555
556         /* Disable PHY interrupts */
557         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
558
559         if (err)
560                 goto phy_err;
561
562         /* Clear the interrupt */
563         err = phy_clear_interrupt(phydev);
564
565         if (err)
566                 goto phy_err;
567
568         return 0;
569
570 phy_err:
571         phy_error(phydev);
572
573         return err;
574 }
575
576 /**
577  * phy_start_interrupts - request and enable interrupts for a PHY device
578  * @phydev: target phy_device struct
579  *
580  * Description: Request the interrupt for the given PHY.
581  *   If this fails, then we set irq to PHY_POLL.
582  *   Otherwise, we enable the interrupts in the PHY.
583  *   This should only be called with a valid IRQ number.
584  *   Returns 0 on success or < 0 on error.
585  */
586 int phy_start_interrupts(struct phy_device *phydev)
587 {
588         int err = 0;
589
590         INIT_WORK(&phydev->phy_queue, phy_change);
591
592         atomic_set(&phydev->irq_disable, 0);
593         if (request_irq(phydev->irq, phy_interrupt,
594                                 IRQF_SHARED,
595                                 "phy_interrupt",
596                                 phydev) < 0) {
597                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
598                                 phydev->bus->name,
599                                 phydev->irq);
600                 phydev->irq = PHY_POLL;
601                 return 0;
602         }
603
604         err = phy_enable_interrupts(phydev);
605
606         return err;
607 }
608 EXPORT_SYMBOL(phy_start_interrupts);
609
610 /**
611  * phy_stop_interrupts - disable interrupts from a PHY device
612  * @phydev: target phy_device struct
613  */
614 int phy_stop_interrupts(struct phy_device *phydev)
615 {
616         int err;
617
618         err = phy_disable_interrupts(phydev);
619
620         if (err)
621                 phy_error(phydev);
622
623         free_irq(phydev->irq, phydev);
624
625         /*
626          * Cannot call flush_scheduled_work() here as desired because
627          * of rtnl_lock(), but we do not really care about what would
628          * be done, except from enable_irq(), so cancel any work
629          * possibly pending and take care of the matter below.
630          */
631         cancel_work_sync(&phydev->phy_queue);
632         /*
633          * If work indeed has been cancelled, disable_irq() will have
634          * been left unbalanced from phy_interrupt() and enable_irq()
635          * has to be called so that other devices on the line work.
636          */
637         while (atomic_dec_return(&phydev->irq_disable) >= 0)
638                 enable_irq(phydev->irq);
639
640         return err;
641 }
642 EXPORT_SYMBOL(phy_stop_interrupts);
643
644
645 /**
646  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
647  * @work: work_struct that describes the work to be done
648  */
649 static void phy_change(struct work_struct *work)
650 {
651         int err;
652         struct phy_device *phydev =
653                 container_of(work, struct phy_device, phy_queue);
654
655         if (phydev->drv->did_interrupt &&
656             !phydev->drv->did_interrupt(phydev))
657                 goto ignore;
658
659         err = phy_disable_interrupts(phydev);
660
661         if (err)
662                 goto phy_err;
663
664         mutex_lock(&phydev->lock);
665         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
666                 phydev->state = PHY_CHANGELINK;
667         mutex_unlock(&phydev->lock);
668
669         atomic_dec(&phydev->irq_disable);
670         enable_irq(phydev->irq);
671
672         /* Reenable interrupts */
673         if (PHY_HALTED != phydev->state)
674                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
675
676         if (err)
677                 goto irq_enable_err;
678
679         /* reschedule state queue work to run as soon as possible */
680         cancel_delayed_work_sync(&phydev->state_queue);
681         schedule_delayed_work(&phydev->state_queue, 0);
682
683         return;
684
685 ignore:
686         atomic_dec(&phydev->irq_disable);
687         enable_irq(phydev->irq);
688         return;
689
690 irq_enable_err:
691         disable_irq(phydev->irq);
692         atomic_inc(&phydev->irq_disable);
693 phy_err:
694         phy_error(phydev);
695 }
696
697 /**
698  * phy_stop - Bring down the PHY link, and stop checking the status
699  * @phydev: target phy_device struct
700  */
701 void phy_stop(struct phy_device *phydev)
702 {
703         mutex_lock(&phydev->lock);
704
705         if (PHY_HALTED == phydev->state)
706                 goto out_unlock;
707
708         if (phydev->irq != PHY_POLL) {
709                 /* Disable PHY Interrupts */
710                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
711
712                 /* Clear any pending interrupts */
713                 phy_clear_interrupt(phydev);
714         }
715
716         phydev->state = PHY_HALTED;
717
718 out_unlock:
719         mutex_unlock(&phydev->lock);
720
721         /*
722          * Cannot call flush_scheduled_work() here as desired because
723          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
724          * will not reenable interrupts.
725          */
726 }
727
728
729 /**
730  * phy_start - start or restart a PHY device
731  * @phydev: target phy_device struct
732  *
733  * Description: Indicates the attached device's readiness to
734  *   handle PHY-related work.  Used during startup to start the
735  *   PHY, and after a call to phy_stop() to resume operation.
736  *   Also used to indicate the MDIO bus has cleared an error
737  *   condition.
738  */
739 void phy_start(struct phy_device *phydev)
740 {
741         mutex_lock(&phydev->lock);
742
743         switch (phydev->state) {
744                 case PHY_STARTING:
745                         phydev->state = PHY_PENDING;
746                         break;
747                 case PHY_READY:
748                         phydev->state = PHY_UP;
749                         break;
750                 case PHY_HALTED:
751                         phydev->state = PHY_RESUMING;
752                 default:
753                         break;
754         }
755         mutex_unlock(&phydev->lock);
756 }
757 EXPORT_SYMBOL(phy_stop);
758 EXPORT_SYMBOL(phy_start);
759
760 /**
761  * phy_state_machine - Handle the state machine
762  * @work: work_struct that describes the work to be done
763  */
764 void phy_state_machine(struct work_struct *work)
765 {
766         struct delayed_work *dwork = to_delayed_work(work);
767         struct phy_device *phydev =
768                         container_of(dwork, struct phy_device, state_queue);
769         int needs_aneg = 0;
770         int err = 0;
771
772         mutex_lock(&phydev->lock);
773
774         if (phydev->adjust_state)
775                 phydev->adjust_state(phydev->attached_dev);
776
777         switch(phydev->state) {
778                 case PHY_DOWN:
779                 case PHY_STARTING:
780                 case PHY_READY:
781                 case PHY_PENDING:
782                         break;
783                 case PHY_UP:
784                         needs_aneg = 1;
785
786                         phydev->link_timeout = PHY_AN_TIMEOUT;
787
788                         break;
789                 case PHY_AN:
790                         err = phy_read_status(phydev);
791
792                         if (err < 0)
793                                 break;
794
795                         /* If the link is down, give up on
796                          * negotiation for now */
797                         if (!phydev->link) {
798                                 phydev->state = PHY_NOLINK;
799                                 netif_carrier_off(phydev->attached_dev);
800                                 phydev->adjust_link(phydev->attached_dev);
801                                 break;
802                         }
803
804                         /* Check if negotiation is done.  Break
805                          * if there's an error */
806                         err = phy_aneg_done(phydev);
807                         if (err < 0)
808                                 break;
809
810                         /* If AN is done, we're running */
811                         if (err > 0) {
812                                 phydev->state = PHY_RUNNING;
813                                 netif_carrier_on(phydev->attached_dev);
814                                 phydev->adjust_link(phydev->attached_dev);
815
816                         } else if (0 == phydev->link_timeout--) {
817                                 int idx;
818
819                                 needs_aneg = 1;
820                                 /* If we have the magic_aneg bit,
821                                  * we try again */
822                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
823                                         break;
824
825                                 /* The timer expired, and we still
826                                  * don't have a setting, so we try
827                                  * forcing it until we find one that
828                                  * works, starting from the fastest speed,
829                                  * and working our way down */
830                                 idx = phy_find_valid(0, phydev->supported);
831
832                                 phydev->speed = settings[idx].speed;
833                                 phydev->duplex = settings[idx].duplex;
834
835                                 phydev->autoneg = AUTONEG_DISABLE;
836
837                                 pr_info("Trying %d/%s\n", phydev->speed,
838                                                 DUPLEX_FULL ==
839                                                 phydev->duplex ?
840                                                 "FULL" : "HALF");
841                         }
842                         break;
843                 case PHY_NOLINK:
844                         err = phy_read_status(phydev);
845
846                         if (err)
847                                 break;
848
849                         if (phydev->link) {
850                                 phydev->state = PHY_RUNNING;
851                                 netif_carrier_on(phydev->attached_dev);
852                                 phydev->adjust_link(phydev->attached_dev);
853                         }
854                         break;
855                 case PHY_FORCING:
856                         err = genphy_update_link(phydev);
857
858                         if (err)
859                                 break;
860
861                         if (phydev->link) {
862                                 phydev->state = PHY_RUNNING;
863                                 netif_carrier_on(phydev->attached_dev);
864                         } else {
865                                 if (0 == phydev->link_timeout--) {
866                                         phy_force_reduction(phydev);
867                                         needs_aneg = 1;
868                                 }
869                         }
870
871                         phydev->adjust_link(phydev->attached_dev);
872                         break;
873                 case PHY_RUNNING:
874                         /* Only register a CHANGE if we are
875                          * polling */
876                         if (PHY_POLL == phydev->irq)
877                                 phydev->state = PHY_CHANGELINK;
878                         break;
879                 case PHY_CHANGELINK:
880                         err = phy_read_status(phydev);
881
882                         if (err)
883                                 break;
884
885                         if (phydev->link) {
886                                 phydev->state = PHY_RUNNING;
887                                 netif_carrier_on(phydev->attached_dev);
888                         } else {
889                                 phydev->state = PHY_NOLINK;
890                                 netif_carrier_off(phydev->attached_dev);
891                         }
892
893                         phydev->adjust_link(phydev->attached_dev);
894
895                         if (PHY_POLL != phydev->irq)
896                                 err = phy_config_interrupt(phydev,
897                                                 PHY_INTERRUPT_ENABLED);
898                         break;
899                 case PHY_HALTED:
900                         if (phydev->link) {
901                                 phydev->link = 0;
902                                 netif_carrier_off(phydev->attached_dev);
903                                 phydev->adjust_link(phydev->attached_dev);
904                         }
905                         break;
906                 case PHY_RESUMING:
907
908                         err = phy_clear_interrupt(phydev);
909
910                         if (err)
911                                 break;
912
913                         err = phy_config_interrupt(phydev,
914                                         PHY_INTERRUPT_ENABLED);
915
916                         if (err)
917                                 break;
918
919                         if (AUTONEG_ENABLE == phydev->autoneg) {
920                                 err = phy_aneg_done(phydev);
921                                 if (err < 0)
922                                         break;
923
924                                 /* err > 0 if AN is done.
925                                  * Otherwise, it's 0, and we're
926                                  * still waiting for AN */
927                                 if (err > 0) {
928                                         err = phy_read_status(phydev);
929                                         if (err)
930                                                 break;
931
932                                         if (phydev->link) {
933                                                 phydev->state = PHY_RUNNING;
934                                                 netif_carrier_on(phydev->attached_dev);
935                                         } else
936                                                 phydev->state = PHY_NOLINK;
937                                         phydev->adjust_link(phydev->attached_dev);
938                                 } else {
939                                         phydev->state = PHY_AN;
940                                         phydev->link_timeout = PHY_AN_TIMEOUT;
941                                 }
942                         } else {
943                                 err = phy_read_status(phydev);
944                                 if (err)
945                                         break;
946
947                                 if (phydev->link) {
948                                         phydev->state = PHY_RUNNING;
949                                         netif_carrier_on(phydev->attached_dev);
950                                 } else
951                                         phydev->state = PHY_NOLINK;
952                                 phydev->adjust_link(phydev->attached_dev);
953                         }
954                         break;
955         }
956
957         mutex_unlock(&phydev->lock);
958
959         if (needs_aneg)
960                 err = phy_start_aneg(phydev);
961
962         if (err < 0)
963                 phy_error(phydev);
964
965         schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
966 }