phylib: SIOCGMIIREG/SIOCSMIIREG: allow access to all mdio addresses
[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 = mdiobus_read(phydev->bus, mii_data->phy_id,
323                                                  mii_data->reg_num);
324                 break;
325
326         case SIOCSMIIREG:
327                 if (mii_data->phy_id == phydev->addr) {
328                         switch(mii_data->reg_num) {
329                         case MII_BMCR:
330                                 if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
331                                         phydev->autoneg = AUTONEG_DISABLE;
332                                 else
333                                         phydev->autoneg = AUTONEG_ENABLE;
334                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
335                                         phydev->duplex = DUPLEX_FULL;
336                                 else
337                                         phydev->duplex = DUPLEX_HALF;
338                                 if ((!phydev->autoneg) &&
339                                                 (val & BMCR_SPEED1000))
340                                         phydev->speed = SPEED_1000;
341                                 else if ((!phydev->autoneg) &&
342                                                 (val & BMCR_SPEED100))
343                                         phydev->speed = SPEED_100;
344                                 break;
345                         case MII_ADVERTISE:
346                                 phydev->advertising = val;
347                                 break;
348                         default:
349                                 /* do nothing */
350                                 break;
351                         }
352                 }
353
354                 mdiobus_write(phydev->bus, mii_data->phy_id,
355                               mii_data->reg_num, val);
356
357                 if (mii_data->reg_num == MII_BMCR &&
358                     val & BMCR_RESET &&
359                     phydev->drv->config_init) {
360                         phy_scan_fixups(phydev);
361                         phydev->drv->config_init(phydev);
362                 }
363                 break;
364
365         case SIOCSHWTSTAMP:
366                 if (phydev->drv->hwtstamp)
367                         return phydev->drv->hwtstamp(phydev, ifr);
368                 /* fall through */
369
370         default:
371                 return -EOPNOTSUPP;
372         }
373
374         return 0;
375 }
376 EXPORT_SYMBOL(phy_mii_ioctl);
377
378 /**
379  * phy_start_aneg - start auto-negotiation for this PHY device
380  * @phydev: the phy_device struct
381  *
382  * Description: Sanitizes the settings (if we're not autonegotiating
383  *   them), and then calls the driver's config_aneg function.
384  *   If the PHYCONTROL Layer is operating, we change the state to
385  *   reflect the beginning of Auto-negotiation or forcing.
386  */
387 int phy_start_aneg(struct phy_device *phydev)
388 {
389         int err;
390
391         mutex_lock(&phydev->lock);
392
393         if (AUTONEG_DISABLE == phydev->autoneg)
394                 phy_sanitize_settings(phydev);
395
396         err = phydev->drv->config_aneg(phydev);
397
398         if (err < 0)
399                 goto out_unlock;
400
401         if (phydev->state != PHY_HALTED) {
402                 if (AUTONEG_ENABLE == phydev->autoneg) {
403                         phydev->state = PHY_AN;
404                         phydev->link_timeout = PHY_AN_TIMEOUT;
405                 } else {
406                         phydev->state = PHY_FORCING;
407                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
408                 }
409         }
410
411 out_unlock:
412         mutex_unlock(&phydev->lock);
413         return err;
414 }
415 EXPORT_SYMBOL(phy_start_aneg);
416
417
418 static void phy_change(struct work_struct *work);
419
420 /**
421  * phy_start_machine - start PHY state machine tracking
422  * @phydev: the phy_device struct
423  * @handler: callback function for state change notifications
424  *
425  * Description: The PHY infrastructure can run a state machine
426  *   which tracks whether the PHY is starting up, negotiating,
427  *   etc.  This function starts the timer which tracks the state
428  *   of the PHY.  If you want to be notified when the state changes,
429  *   pass in the callback @handler, otherwise, pass NULL.  If you
430  *   want to maintain your own state machine, do not call this
431  *   function.
432  */
433 void phy_start_machine(struct phy_device *phydev,
434                 void (*handler)(struct net_device *))
435 {
436         phydev->adjust_state = handler;
437
438         schedule_delayed_work(&phydev->state_queue, HZ);
439 }
440
441 /**
442  * phy_stop_machine - stop the PHY state machine tracking
443  * @phydev: target phy_device struct
444  *
445  * Description: Stops the state machine timer, sets the state to UP
446  *   (unless it wasn't up yet). This function must be called BEFORE
447  *   phy_detach.
448  */
449 void phy_stop_machine(struct phy_device *phydev)
450 {
451         cancel_delayed_work_sync(&phydev->state_queue);
452
453         mutex_lock(&phydev->lock);
454         if (phydev->state > PHY_UP)
455                 phydev->state = PHY_UP;
456         mutex_unlock(&phydev->lock);
457
458         phydev->adjust_state = NULL;
459 }
460
461 /**
462  * phy_force_reduction - reduce PHY speed/duplex settings by one step
463  * @phydev: target phy_device struct
464  *
465  * Description: Reduces the speed/duplex settings by one notch,
466  *   in this order--
467  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
468  *   The function bottoms out at 10/HALF.
469  */
470 static void phy_force_reduction(struct phy_device *phydev)
471 {
472         int idx;
473
474         idx = phy_find_setting(phydev->speed, phydev->duplex);
475         
476         idx++;
477
478         idx = phy_find_valid(idx, phydev->supported);
479
480         phydev->speed = settings[idx].speed;
481         phydev->duplex = settings[idx].duplex;
482
483         pr_info("Trying %d/%s\n", phydev->speed,
484                         DUPLEX_FULL == phydev->duplex ?
485                         "FULL" : "HALF");
486 }
487
488
489 /**
490  * phy_error - enter HALTED state for this PHY device
491  * @phydev: target phy_device struct
492  *
493  * Moves the PHY to the HALTED state in response to a read
494  * or write error, and tells the controller the link is down.
495  * Must not be called from interrupt context, or while the
496  * phydev->lock is held.
497  */
498 static void phy_error(struct phy_device *phydev)
499 {
500         mutex_lock(&phydev->lock);
501         phydev->state = PHY_HALTED;
502         mutex_unlock(&phydev->lock);
503 }
504
505 /**
506  * phy_interrupt - PHY interrupt handler
507  * @irq: interrupt line
508  * @phy_dat: phy_device pointer
509  *
510  * Description: When a PHY interrupt occurs, the handler disables
511  * interrupts, and schedules a work task to clear the interrupt.
512  */
513 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
514 {
515         struct phy_device *phydev = phy_dat;
516
517         if (PHY_HALTED == phydev->state)
518                 return IRQ_NONE;                /* It can't be ours.  */
519
520         /* The MDIO bus is not allowed to be written in interrupt
521          * context, so we need to disable the irq here.  A work
522          * queue will write the PHY to disable and clear the
523          * interrupt, and then reenable the irq line. */
524         disable_irq_nosync(irq);
525         atomic_inc(&phydev->irq_disable);
526
527         schedule_work(&phydev->phy_queue);
528
529         return IRQ_HANDLED;
530 }
531
532 /**
533  * phy_enable_interrupts - Enable the interrupts from the PHY side
534  * @phydev: target phy_device struct
535  */
536 static int phy_enable_interrupts(struct phy_device *phydev)
537 {
538         int err;
539
540         err = phy_clear_interrupt(phydev);
541
542         if (err < 0)
543                 return err;
544
545         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
546
547         return err;
548 }
549
550 /**
551  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
552  * @phydev: target phy_device struct
553  */
554 static int phy_disable_interrupts(struct phy_device *phydev)
555 {
556         int err;
557
558         /* Disable PHY interrupts */
559         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
560
561         if (err)
562                 goto phy_err;
563
564         /* Clear the interrupt */
565         err = phy_clear_interrupt(phydev);
566
567         if (err)
568                 goto phy_err;
569
570         return 0;
571
572 phy_err:
573         phy_error(phydev);
574
575         return err;
576 }
577
578 /**
579  * phy_start_interrupts - request and enable interrupts for a PHY device
580  * @phydev: target phy_device struct
581  *
582  * Description: Request the interrupt for the given PHY.
583  *   If this fails, then we set irq to PHY_POLL.
584  *   Otherwise, we enable the interrupts in the PHY.
585  *   This should only be called with a valid IRQ number.
586  *   Returns 0 on success or < 0 on error.
587  */
588 int phy_start_interrupts(struct phy_device *phydev)
589 {
590         int err = 0;
591
592         INIT_WORK(&phydev->phy_queue, phy_change);
593
594         atomic_set(&phydev->irq_disable, 0);
595         if (request_irq(phydev->irq, phy_interrupt,
596                                 IRQF_SHARED,
597                                 "phy_interrupt",
598                                 phydev) < 0) {
599                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
600                                 phydev->bus->name,
601                                 phydev->irq);
602                 phydev->irq = PHY_POLL;
603                 return 0;
604         }
605
606         err = phy_enable_interrupts(phydev);
607
608         return err;
609 }
610 EXPORT_SYMBOL(phy_start_interrupts);
611
612 /**
613  * phy_stop_interrupts - disable interrupts from a PHY device
614  * @phydev: target phy_device struct
615  */
616 int phy_stop_interrupts(struct phy_device *phydev)
617 {
618         int err;
619
620         err = phy_disable_interrupts(phydev);
621
622         if (err)
623                 phy_error(phydev);
624
625         free_irq(phydev->irq, phydev);
626
627         /*
628          * Cannot call flush_scheduled_work() here as desired because
629          * of rtnl_lock(), but we do not really care about what would
630          * be done, except from enable_irq(), so cancel any work
631          * possibly pending and take care of the matter below.
632          */
633         cancel_work_sync(&phydev->phy_queue);
634         /*
635          * If work indeed has been cancelled, disable_irq() will have
636          * been left unbalanced from phy_interrupt() and enable_irq()
637          * has to be called so that other devices on the line work.
638          */
639         while (atomic_dec_return(&phydev->irq_disable) >= 0)
640                 enable_irq(phydev->irq);
641
642         return err;
643 }
644 EXPORT_SYMBOL(phy_stop_interrupts);
645
646
647 /**
648  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
649  * @work: work_struct that describes the work to be done
650  */
651 static void phy_change(struct work_struct *work)
652 {
653         int err;
654         struct phy_device *phydev =
655                 container_of(work, struct phy_device, phy_queue);
656
657         if (phydev->drv->did_interrupt &&
658             !phydev->drv->did_interrupt(phydev))
659                 goto ignore;
660
661         err = phy_disable_interrupts(phydev);
662
663         if (err)
664                 goto phy_err;
665
666         mutex_lock(&phydev->lock);
667         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
668                 phydev->state = PHY_CHANGELINK;
669         mutex_unlock(&phydev->lock);
670
671         atomic_dec(&phydev->irq_disable);
672         enable_irq(phydev->irq);
673
674         /* Reenable interrupts */
675         if (PHY_HALTED != phydev->state)
676                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
677
678         if (err)
679                 goto irq_enable_err;
680
681         /* reschedule state queue work to run as soon as possible */
682         cancel_delayed_work_sync(&phydev->state_queue);
683         schedule_delayed_work(&phydev->state_queue, 0);
684
685         return;
686
687 ignore:
688         atomic_dec(&phydev->irq_disable);
689         enable_irq(phydev->irq);
690         return;
691
692 irq_enable_err:
693         disable_irq(phydev->irq);
694         atomic_inc(&phydev->irq_disable);
695 phy_err:
696         phy_error(phydev);
697 }
698
699 /**
700  * phy_stop - Bring down the PHY link, and stop checking the status
701  * @phydev: target phy_device struct
702  */
703 void phy_stop(struct phy_device *phydev)
704 {
705         mutex_lock(&phydev->lock);
706
707         if (PHY_HALTED == phydev->state)
708                 goto out_unlock;
709
710         if (phydev->irq != PHY_POLL) {
711                 /* Disable PHY Interrupts */
712                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
713
714                 /* Clear any pending interrupts */
715                 phy_clear_interrupt(phydev);
716         }
717
718         phydev->state = PHY_HALTED;
719
720 out_unlock:
721         mutex_unlock(&phydev->lock);
722
723         /*
724          * Cannot call flush_scheduled_work() here as desired because
725          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
726          * will not reenable interrupts.
727          */
728 }
729
730
731 /**
732  * phy_start - start or restart a PHY device
733  * @phydev: target phy_device struct
734  *
735  * Description: Indicates the attached device's readiness to
736  *   handle PHY-related work.  Used during startup to start the
737  *   PHY, and after a call to phy_stop() to resume operation.
738  *   Also used to indicate the MDIO bus has cleared an error
739  *   condition.
740  */
741 void phy_start(struct phy_device *phydev)
742 {
743         mutex_lock(&phydev->lock);
744
745         switch (phydev->state) {
746                 case PHY_STARTING:
747                         phydev->state = PHY_PENDING;
748                         break;
749                 case PHY_READY:
750                         phydev->state = PHY_UP;
751                         break;
752                 case PHY_HALTED:
753                         phydev->state = PHY_RESUMING;
754                 default:
755                         break;
756         }
757         mutex_unlock(&phydev->lock);
758 }
759 EXPORT_SYMBOL(phy_stop);
760 EXPORT_SYMBOL(phy_start);
761
762 /**
763  * phy_state_machine - Handle the state machine
764  * @work: work_struct that describes the work to be done
765  */
766 void phy_state_machine(struct work_struct *work)
767 {
768         struct delayed_work *dwork = to_delayed_work(work);
769         struct phy_device *phydev =
770                         container_of(dwork, struct phy_device, state_queue);
771         int needs_aneg = 0;
772         int err = 0;
773
774         mutex_lock(&phydev->lock);
775
776         if (phydev->adjust_state)
777                 phydev->adjust_state(phydev->attached_dev);
778
779         switch(phydev->state) {
780                 case PHY_DOWN:
781                 case PHY_STARTING:
782                 case PHY_READY:
783                 case PHY_PENDING:
784                         break;
785                 case PHY_UP:
786                         needs_aneg = 1;
787
788                         phydev->link_timeout = PHY_AN_TIMEOUT;
789
790                         break;
791                 case PHY_AN:
792                         err = phy_read_status(phydev);
793
794                         if (err < 0)
795                                 break;
796
797                         /* If the link is down, give up on
798                          * negotiation for now */
799                         if (!phydev->link) {
800                                 phydev->state = PHY_NOLINK;
801                                 netif_carrier_off(phydev->attached_dev);
802                                 phydev->adjust_link(phydev->attached_dev);
803                                 break;
804                         }
805
806                         /* Check if negotiation is done.  Break
807                          * if there's an error */
808                         err = phy_aneg_done(phydev);
809                         if (err < 0)
810                                 break;
811
812                         /* If AN is done, we're running */
813                         if (err > 0) {
814                                 phydev->state = PHY_RUNNING;
815                                 netif_carrier_on(phydev->attached_dev);
816                                 phydev->adjust_link(phydev->attached_dev);
817
818                         } else if (0 == phydev->link_timeout--) {
819                                 int idx;
820
821                                 needs_aneg = 1;
822                                 /* If we have the magic_aneg bit,
823                                  * we try again */
824                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
825                                         break;
826
827                                 /* The timer expired, and we still
828                                  * don't have a setting, so we try
829                                  * forcing it until we find one that
830                                  * works, starting from the fastest speed,
831                                  * and working our way down */
832                                 idx = phy_find_valid(0, phydev->supported);
833
834                                 phydev->speed = settings[idx].speed;
835                                 phydev->duplex = settings[idx].duplex;
836
837                                 phydev->autoneg = AUTONEG_DISABLE;
838
839                                 pr_info("Trying %d/%s\n", phydev->speed,
840                                                 DUPLEX_FULL ==
841                                                 phydev->duplex ?
842                                                 "FULL" : "HALF");
843                         }
844                         break;
845                 case PHY_NOLINK:
846                         err = phy_read_status(phydev);
847
848                         if (err)
849                                 break;
850
851                         if (phydev->link) {
852                                 phydev->state = PHY_RUNNING;
853                                 netif_carrier_on(phydev->attached_dev);
854                                 phydev->adjust_link(phydev->attached_dev);
855                         }
856                         break;
857                 case PHY_FORCING:
858                         err = genphy_update_link(phydev);
859
860                         if (err)
861                                 break;
862
863                         if (phydev->link) {
864                                 phydev->state = PHY_RUNNING;
865                                 netif_carrier_on(phydev->attached_dev);
866                         } else {
867                                 if (0 == phydev->link_timeout--) {
868                                         phy_force_reduction(phydev);
869                                         needs_aneg = 1;
870                                 }
871                         }
872
873                         phydev->adjust_link(phydev->attached_dev);
874                         break;
875                 case PHY_RUNNING:
876                         /* Only register a CHANGE if we are
877                          * polling */
878                         if (PHY_POLL == phydev->irq)
879                                 phydev->state = PHY_CHANGELINK;
880                         break;
881                 case PHY_CHANGELINK:
882                         err = phy_read_status(phydev);
883
884                         if (err)
885                                 break;
886
887                         if (phydev->link) {
888                                 phydev->state = PHY_RUNNING;
889                                 netif_carrier_on(phydev->attached_dev);
890                         } else {
891                                 phydev->state = PHY_NOLINK;
892                                 netif_carrier_off(phydev->attached_dev);
893                         }
894
895                         phydev->adjust_link(phydev->attached_dev);
896
897                         if (PHY_POLL != phydev->irq)
898                                 err = phy_config_interrupt(phydev,
899                                                 PHY_INTERRUPT_ENABLED);
900                         break;
901                 case PHY_HALTED:
902                         if (phydev->link) {
903                                 phydev->link = 0;
904                                 netif_carrier_off(phydev->attached_dev);
905                                 phydev->adjust_link(phydev->attached_dev);
906                         }
907                         break;
908                 case PHY_RESUMING:
909
910                         err = phy_clear_interrupt(phydev);
911
912                         if (err)
913                                 break;
914
915                         err = phy_config_interrupt(phydev,
916                                         PHY_INTERRUPT_ENABLED);
917
918                         if (err)
919                                 break;
920
921                         if (AUTONEG_ENABLE == phydev->autoneg) {
922                                 err = phy_aneg_done(phydev);
923                                 if (err < 0)
924                                         break;
925
926                                 /* err > 0 if AN is done.
927                                  * Otherwise, it's 0, and we're
928                                  * still waiting for AN */
929                                 if (err > 0) {
930                                         err = phy_read_status(phydev);
931                                         if (err)
932                                                 break;
933
934                                         if (phydev->link) {
935                                                 phydev->state = PHY_RUNNING;
936                                                 netif_carrier_on(phydev->attached_dev);
937                                         } else
938                                                 phydev->state = PHY_NOLINK;
939                                         phydev->adjust_link(phydev->attached_dev);
940                                 } else {
941                                         phydev->state = PHY_AN;
942                                         phydev->link_timeout = PHY_AN_TIMEOUT;
943                                 }
944                         } else {
945                                 err = phy_read_status(phydev);
946                                 if (err)
947                                         break;
948
949                                 if (phydev->link) {
950                                         phydev->state = PHY_RUNNING;
951                                         netif_carrier_on(phydev->attached_dev);
952                                 } else
953                                         phydev->state = PHY_NOLINK;
954                                 phydev->adjust_link(phydev->attached_dev);
955                         }
956                         break;
957         }
958
959         mutex_unlock(&phydev->lock);
960
961         if (needs_aneg)
962                 err = phy_start_aneg(phydev);
963
964         if (err < 0)
965                 phy_error(phydev);
966
967         schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
968 }