aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/phy/phy_device.c
blob: e35460165bf76709211ffa16f969a3b1fb07dbe8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
/*
 * drivers/net/phy/phy_device.c
 *
 * Framework for finding and configuring PHYs.
 * Also contains generic PHY driver
 *
 * Author: Andy Fleming
 *
 * Copyright (c) 2004 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

MODULE_DESCRIPTION("PHY library");
MODULE_AUTHOR("Andy Fleming");
MODULE_LICENSE("GPL");

static struct phy_driver genphy_driver;
extern int mdio_bus_init(void);
extern void mdio_bus_exit(void);

void phy_device_free(struct phy_device *phydev)
{
	kfree(phydev);
}

static void phy_device_release(struct device *dev)
{
	phy_device_free(to_phy_device(dev));
}

static LIST_HEAD(phy_fixup_list);
static DEFINE_MUTEX(phy_fixup_lock);

/*
 * Creates a new phy_fixup and adds it to the list
 * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
 * 	It can also be PHY_ANY_UID
 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
 * 	comparison
 * @run: The actual code to be run when a matching PHY is found
 */
int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
		int (*run)(struct phy_device *))
{
	struct phy_fixup *fixup;

	fixup = kzalloc(sizeof(struct phy_fixup), GFP_KERNEL);
	if (!fixup)
		return -ENOMEM;

	strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
	fixup->phy_uid = phy_uid;
	fixup->phy_uid_mask = phy_uid_mask;
	fixup->run = run;

	mutex_lock(&phy_fixup_lock);
	list_add_tail(&fixup->list, &phy_fixup_list);
	mutex_unlock(&phy_fixup_lock);

	return 0;
}
EXPORT_SYMBOL(phy_register_fixup);

/* Registers a fixup to be run on any PHY with the UID in phy_uid */
int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
		int (*run)(struct phy_device *))
{
	return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
}
EXPORT_SYMBOL(phy_register_fixup_for_uid);

/* Registers a fixup to be run on the PHY with id string bus_id */
int phy_register_fixup_for_id(const char *bus_id,
		int (*run)(struct phy_device *))
{
	return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
}
EXPORT_SYMBOL(phy_register_fixup_for_id);

/*
 * Returns 1 if fixup matches phydev in bus_id and phy_uid.
 * Fixups can be set to match any in one or more fields.
 */
static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
{
	if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0)
		if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
			return 0;

	if ((fixup->phy_uid & fixup->phy_uid_mask) !=
			(phydev->phy_id & fixup->phy_uid_mask))
		if (fixup->phy_uid != PHY_ANY_UID)
			return 0;

	return 1;
}

/* Runs any matching fixups for this phydev */
int phy_scan_fixups(struct phy_device *phydev)
{
	struct phy_fixup *fixup;

	mutex_lock(&phy_fixup_lock);
	list_for_each_entry(fixup, &phy_fixup_list, list) {
		if (phy_needs_fixup(phydev, fixup)) {
			int err;

			err = fixup->run(phydev);

			if (err < 0)
				return err;
		}
	}
	mutex_unlock(&phy_fixup_lock);

	return 0;
}
EXPORT_SYMBOL(phy_scan_fixups);

struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
{
	struct phy_device *dev;
	/* We allocate the device, and initialize the
	 * default values */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (NULL == dev)
		return (struct phy_device*) PTR_ERR((void*)-ENOMEM);

	dev->dev.release = phy_device_release;

	dev->speed = 0;
	dev->duplex = -1;
	dev->pause = dev->asym_pause = 0;
	dev->link = 1;
	dev->interface = PHY_INTERFACE_MODE_GMII;

	dev->autoneg = AUTONEG_ENABLE;

	dev->addr = addr;
	dev->phy_id = phy_id;
	dev->bus = bus;

	dev->state = PHY_DOWN;

	mutex_init(&dev->lock);

	return dev;
}
EXPORT_SYMBOL(phy_device_create);

/**
 * get_phy_id - reads the specified addr for its ID.
 * @bus: the target MII bus
 * @addr: PHY address on the MII bus
 * @phy_id: where to store the ID retrieved.
 *
 * Description: Reads the ID registers of the PHY at @addr on the
 *   @bus, stores it in @phy_id and returns zero on success.
 */
int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
{
	int phy_reg;

	/* Grab the bits from PHYIR1, and put them
	 * in the upper half */
	phy_reg = bus->read(bus, addr, MII_PHYSID1);

	if (phy_reg < 0)
		return -EIO;

	*phy_id = (phy_reg & 0xffff) << 16;

	/* Grab the bits from PHYIR2, and put them in the lower half */
	phy_reg = bus->read(bus, addr, MII_PHYSID2);

	if (phy_reg < 0)
		return -EIO;

	*phy_id |= (phy_reg & 0xffff);

	return 0;
}
EXPORT_SYMBOL(get_phy_id);

/**
 * get_phy_device - reads the specified PHY device and returns its @phy_device struct
 * @bus: the target MII bus
 * @addr: PHY address on the MII bus
 *
 * Description: Reads the ID registers of the PHY at @addr on the
 *   @bus, then allocates and returns the phy_device to represent it.
 */
struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
{
	struct phy_device *dev = NULL;
	u32 phy_id;
	int r;

	r = get_phy_id(bus, addr, &phy_id);
	if (r)
		return ERR_PTR(r);

	/* If the phy_id is mostly Fs, there is no device there */
	if ((phy_id & 0x1fffffff) == 0x1fffffff)
		return NULL;

	/*
	 * Broken hardware is sometimes missing the pull-up resistor on the
	 * MDIO line, which results in reads to non-existent devices returning
	 * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
	 * device as well.
	 */
	if (phy_id == 0)
		return NULL;

	dev = phy_device_create(bus, addr, phy_id);

	return dev;
}

/**
 * phy_prepare_link - prepares the PHY layer to monitor link status
 * @phydev: target phy_device struct
 * @handler: callback function for link status change notifications
 *
 * Description: Tells the PHY infrastructure to handle the
 *   gory details on monitoring link status (whether through
 *   polling or an interrupt), and to call back to the
 *   connected device driver when the link status changes.
 *   If you want to monitor your own link state, don't call
 *   this function.
 */
void phy_prepare_link(struct phy_device *phydev,
		void (*handler)(struct net_device *))
{
	phydev->adjust_link = handler;
}

/**
 * phy_connect - connect an ethernet device to a PHY device
 * @dev: the network device to connect
 * @bus_id: the id string of the PHY device to connect
 * @handler: callback function for state change notifications
 * @flags: PHY device's dev_flags
 * @interface: PHY device's interface
 *
 * Description: Convenience function for connecting ethernet
 *   devices to PHY devices.  The default behavior is for
 *   the PHY infrastructure to handle everything, and only notify
 *   the connected driver when the link status changes.  If you
 *   don't want, or can't use the provided functionality, you may
 *   choose to call only the subset of functions which provide
 *   the desired functionality.
 */
struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
		void (*handler)(struct net_device *), u32 flags,
		phy_interface_t interface)
{
	struct phy_device *phydev;

	phydev = phy_attach(dev, bus_id, flags, interface);

	if (IS_ERR(phydev))
		return phydev;

	phy_prepare_link(phydev, handler);

	phy_start_machine(phydev, NULL);

	if (phydev->irq > 0)
		phy_start_interrupts(phydev);

	return phydev;
}
EXPORT_SYMBOL(phy_connect);

/**
 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device
 * @phydev: target phy_device struct
 */
void phy_disconnect(struct phy_device *phydev)
{
	if (phydev->irq > 0)
		phy_stop_interrupts(phydev);

	phy_stop_machine(phydev);
	
	phydev->adjust_link = NULL;

	phy_detach(phydev);
}
EXPORT_SYMBOL(phy_disconnect);

/**
 * phy_attach - attach a network device to a particular PHY device
 * @dev: network device to attach
 * @bus_id: PHY device to attach
 * @flags: PHY device's dev_flags
 * @interface: PHY device's interface
 *
 * Description: Called by drivers to attach to a particular PHY
 *     device. The phy_device is found, and properly hooked up
 *     to the phy_driver.  If no driver is attached, then the
 *     genphy_driver is used.  The phy_device is given a ptr to
 *     the attaching device, and given a callback for link status
 *     change.  The phy_device is returned to the attaching driver.
 */
struct phy_device *phy_attach(struct net_device *dev,
		const char *bus_id, u32 flags, phy_interface_t interface)
{
	struct bus_type *bus = &mdio_bus_type;
	struct phy_device *phydev;
	struct device *d;

	/* Search the list of PHY devices on the mdio bus for the
	 * PHY with the requested name */
	d = bus_find_device_by_name(bus, NULL, bus_id);
	if (d) {
		phydev = to_phy_device(d);
	} else {
		printk(KERN_ERR "%s not found\n", bus_id);
		return ERR_PTR(-ENODEV);
	}

	/* Assume that if there is no driver, that it doesn't
	 * exist, and we should use the genphy driver. */
	if (NULL == d->driver) {
		int err;
		d->driver = &genphy_driver.driver;

		err = d->driver->probe(d);
		if (err >= 0)
			err = device_bind_driver(d);

		if (err)
			return ERR_PTR(err);
	}

	if (phydev->attached_dev) {
		printk(KERN_ERR "%s: %s already attached\n",
				dev->name, bus_id);
		return ERR_PTR(-EBUSY);
	}

	phydev->attached_dev = dev;

	phydev->dev_flags = flags;

	phydev->interface = interface;

	/* Do initial configuration here, now that
	 * we have certain key parameters
	 * (dev_flags and interface) */
	if (phydev->drv->config_init) {
		int err;

		err = phy_scan_fixups(phydev);

		if (err < 0)
			return ERR_PTR(err);

		err = phydev->drv->config_init(phydev);

		if (err < 0)
			return ERR_PTR(err);
	}

	return phydev;
}
EXPORT_SYMBOL(phy_attach);

/**
 * phy_detach - detach a PHY device from its network device
 * @phydev: target phy_device struct
 */
void phy_detach(struct phy_device *phydev)
{
	phydev->attached_dev = NULL;

	/* If the device had no specific driver before (i.e. - it
	 * was using the generic driver), we unbind the device
	 * from the generic driver so that there's a chance a
	 * real driver could be loaded */
	if (phydev->dev.driver == &genphy_driver.driver)
		device_release_driver(&phydev->dev);
}
EXPORT_SYMBOL(phy_detach);


/* Generic PHY support and helper functions */

/**
 * genphy_config_advert - sanitize and advertise auto-negotation parameters
 * @phydev: target phy_device struct
 *
 * Description: Writes MII_ADVERTISE with the appropriate values,
 *   after sanitizing the values to make sure we only advertise
 *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
 *   hasn't changed, and > 0 if it has changed.
 */
int genphy_config_advert(struct phy_device *phydev)
{
	u32 advertise;
	int oldadv, adv;
	int err, changed = 0;

	/* Only allow advertising what
	 * this PHY supports */
	phydev->advertising &= phydev->supported;
	advertise = phydev->advertising;

	/* Setup standard advertisement */
	oldadv = adv = phy_read(phydev, MII_ADVERTISE);

	if (adv < 0)
		return adv;

	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | 
		 ADVERTISE_PAUSE_ASYM);
	if (advertise & ADVERTISED_10baseT_Half)
		adv |= ADVERTISE_10HALF;
	if (advertise & ADVERTISED_10baseT_Full)
		adv |= ADVERTISE_10FULL;
	if (advertise & ADVERTISED_100baseT_Half)
		adv |= ADVERTISE_100HALF;
	if (advertise & ADVERTISED_100baseT_Full)
		adv |= ADVERTISE_100FULL;
	if (advertise & ADVERTISED_Pause)
		adv |= ADVERTISE_PAUSE_CAP;
	if (advertise & ADVERTISED_Asym_Pause)
		adv |= ADVERTISE_PAUSE_ASYM;

	if (adv != oldadv) {
		err = phy_write(phydev, MII_ADVERTISE, adv);

		if (err < 0)
			return err;
		changed = 1;
	}

	/* Configure gigabit if it's supported */
	if (phydev->supported & (SUPPORTED_1000baseT_Half |
				SUPPORTED_1000baseT_Full)) {
		oldadv = adv = phy_read(phydev, MII_CTRL1000);

		if (adv < 0)
			return adv;

		adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
		if (advertise & SUPPORTED_1000baseT_Half)
			adv |= ADVERTISE_1000HALF;
		if (advertise & SUPPORTED_1000baseT_Full)
			adv |= ADVERTISE_1000FULL;

		if (adv != oldadv) {
			err = phy_write(phydev, MII_CTRL1000, adv);

			if (err < 0)
				return err;
			changed = 1;
		}
	}

	return changed;
}
EXPORT_SYMBOL(genphy_config_advert);

/**
 * genphy_setup_forced - configures/forces speed/duplex from @phydev
 * @phydev: target phy_device struct
 *
 * Description: Configures MII_BMCR to force speed/duplex
 *   to the values in phydev. Assumes that the values are valid.
 *   Please see phy_sanitize_settings().
 */
int genphy_setup_forced(struct phy_device *phydev)
{
	int err;
	int ctl = 0;

	phydev->pause = phydev->asym_pause = 0;

	if (SPEED_1000 == phydev->speed)
		ctl |= BMCR_SPEED1000;
	else if (SPEED_100 == phydev->speed)
		ctl |= BMCR_SPEED100;

	if (DUPLEX_FULL == phydev->duplex)
		ctl |= BMCR_FULLDPLX;
	
	err = phy_write(phydev, MII_BMCR, ctl);

	return err;
}


/**
 * genphy_restart_aneg - Enable and Restart Autonegotiation
 * @phydev: target phy_device struct
 */
int genphy_restart_aneg(struct phy_device *phydev)
{
	int ctl;

	ctl = phy_read(phydev, MII_BMCR);

	if (ctl < 0)
		return ctl;

	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);

	/* Don't isolate the PHY if we're negotiating */
	ctl &= ~(BMCR_ISOLATE);

	ctl = phy_write(phydev, MII_BMCR, ctl);

	return ctl;
}
EXPORT_SYMBOL(genphy_restart_aneg);


/**
 * genphy_config_aneg - restart auto-negotiation or write BMCR
 * @phydev: target phy_device struct
 *
 * Description: If auto-negotiation is enabled, we configure the
 *   advertising, and then restart auto-negotiation.  If it is not
 *   enabled, then we write the BMCR.
 */
int genphy_config_aneg(struct phy_device *phydev)
{
	int result;

	if (AUTONEG_ENABLE != phydev->autoneg)
		return genphy_setup_forced(phydev);

	result = genphy_config_advert(phydev);

	if (result < 0) /* error */
		return result;

	if (result == 0) {
		/* Advertisment hasn't changed, but maybe aneg was never on to
		 * begin with?  Or maybe phy was isolated? */
		int ctl = phy_read(phydev, MII_BMCR);

		if (ctl < 0)
			return ctl;

		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
			result = 1; /* do restart aneg */
	}

	/* Only restart aneg if we are advertising something different
	 * than we were before.	 */
	if (result > 0)
		result = genphy_restart_aneg(phydev);

	return result;
}
EXPORT_SYMBOL(genphy_config_aneg);

/**
 * genphy_update_link - update link status in @phydev
 * @phydev: target phy_device struct
 *
 * Description: Update the value in phydev->link to reflect the
 *   current link value.  In order to do this, we need to read
 *   the status register twice, keeping the second value.
 */
int genphy_update_link(struct phy_device *phydev)
{
	int status;

	/* Do a fake read */
	status = phy_read(phydev, MII_BMSR);

	if (status < 0)
		return status;

	/* Read link and autonegotiation status */
	status = phy_read(phydev, MII_BMSR);

	if (status < 0)
		return status;

	if ((status & BMSR_LSTATUS) == 0)
		phydev->link = 0;
	else
		phydev->link = 1;

	return 0;
}
EXPORT_SYMBOL(genphy_update_link);

/**
 * genphy_read_status - check the link status and update current link state
 * @phydev: target phy_device struct
 *
 * Description: Check the link, then figure out the current state
 *   by comparing what we advertise with what the link partner
 *   advertises.  Start by checking the gigabit possibilities,
 *   then move on to 10/100.
 */
int genphy_read_status(struct phy_device *phydev)
{
	int adv;
	int err;
	int lpa;
	int lpagb = 0;

	/* Update the link, but return if there
	 * was an error */
	err = genphy_update_link(phydev);
	if (err)
		return err;

	if (AUTONEG_ENABLE == phydev->autoneg) {
		if (phydev->supported & (SUPPORTED_1000baseT_Half
					| SUPPORTED_1000baseT_Full)) {
			lpagb = phy_read(phydev, MII_STAT1000);

			if (lpagb < 0)
				return lpagb;

			adv = phy_read(phydev, MII_CTRL1000);

			if (adv < 0)
				return adv;

			lpagb &= adv << 2;
		}

		lpa = phy_read(phydev, MII_LPA);

		if (lpa < 0)
			return lpa;

		adv = phy_read(phydev, MII_ADVERTISE);

		if (adv < 0)
			return adv;

		lpa &= adv;

		phydev->speed = SPEED_10;
		phydev->duplex = DUPLEX_HALF;
		phydev->pause = phydev->asym_pause = 0;

		if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
			phydev->speed = SPEED_1000;

			if (lpagb & LPA_1000FULL)
				phydev->duplex = DUPLEX_FULL;
		} else if (lpa & (LPA_100FULL | LPA_100HALF)) {
			phydev->speed = SPEED_100;
			
			if (lpa & LPA_100FULL)
				phydev->duplex = DUPLEX_FULL;
		} else
			if (lpa & LPA_10FULL)
				phydev->duplex = DUPLEX_FULL;

		if (phydev->duplex == DUPLEX_FULL){
			phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
			phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
		}
	} else {
		int bmcr = phy_read(phydev, MII_BMCR);
		if (bmcr < 0)
			return bmcr;

		if (bmcr & BMCR_FULLDPLX)
			phydev->duplex = DUPLEX_FULL;
		else
			phydev->duplex = DUPLEX_HALF;

		if (bmcr & BMCR_SPEED1000)
			phydev->speed = SPEED_1000;
		else if (bmcr & BMCR_SPEED100)
			phydev->speed = SPEED_100;
		else
			phydev->speed = SPEED_10;

		phydev->pause = phydev->asym_pause = 0;
	}

	return 0;
}
EXPORT_SYMBOL(genphy_read_status);

static int genphy_config_init(struct phy_device *phydev)
{
	int val;
	u32 features;

	/* For now, I'll claim that the generic driver supports
	 * all possible port types */
	features = (SUPPORTED_TP | SUPPORTED_MII
			| SUPPORTED_AUI | SUPPORTED_FIBRE |
			SUPPORTED_BNC);

	/* Do we support autonegotiation? */
	val = phy_read(phydev, MII_BMSR);

	if (val < 0)
		return val;

	if (val & BMSR_ANEGCAPABLE)
		features |= SUPPORTED_Autoneg;

	if (val & BMSR_100FULL)
		features |= SUPPORTED_100baseT_Full;
	if (val & BMSR_100HALF)
		features |= SUPPORTED_100baseT_Half;
	if (val & BMSR_10FULL)
		features |= SUPPORTED_10baseT_Full;
	if (val & BMSR_10HALF)
		features |= SUPPORTED_10baseT_Half;

	if (val & BMSR_ESTATEN) {
		val = phy_read(phydev, MII_ESTATUS);

		if (val < 0)
			return val;

		if (val & ESTATUS_1000_TFULL)
			features |= SUPPORTED_1000baseT_Full;
		if (val & ESTATUS_1000_THALF)
			features |= SUPPORTED_1000baseT_Half;
	}

	phydev->supported = features;
	phydev->advertising = features;

	return 0;
}
int genphy_suspend(struct phy_device *phydev)
{
	int value;

	mutex_lock(&phydev->lock);

	value = phy_read(phydev, MII_BMCR);
	phy_write(phydev, MII_BMCR, (value | BMCR_PDOWN));

	mutex_unlock(&phydev->lock);

	return 0;
}
EXPORT_SYMBOL(genphy_suspend);

int genphy_resume(struct phy_device *phydev)
{
	int value;

	mutex_lock(&phydev->lock);

	value = phy_read(phydev, MII_BMCR);
	phy_write(phydev, MII_BMCR, (value & ~BMCR_PDOWN));

	mutex_unlock(&phydev->lock);

	return 0;
}
EXPORT_SYMBOL(genphy_resume);

/**
 * phy_probe - probe and init a PHY device
 * @dev: device to probe and init
 *
 * Description: Take care of setting up the phy_device structure,
 *   set the state to READY (the driver's init function should
 *   set it to STARTING if needed).
 */
static int phy_probe(struct device *dev)
{
	struct phy_device *phydev;
	struct phy_driver *phydrv;
	struct device_driver *drv;
	int err = 0;

	phydev = to_phy_device(dev);

	/* Make sure the driver is held.
	 * XXX -- Is this correct? */
	drv = get_driver(phydev->dev.driver);
	phydrv = to_phy_driver(drv);
	phydev->drv = phydrv;

	/* Disable the interrupt if the PHY doesn't support it */
	if (!(phydrv->flags & PHY_HAS_INTERRUPT))
		phydev->irq = PHY_POLL;

	mutex_lock(&phydev->lock);

	/* Start out supporting everything. Eventually,
	 * a controller will attach, and may modify one
	 * or both of these values */
	phydev->supported = phydrv->features;
	phydev->advertising = phydrv->features;

	/* Set the state to READY by default */
	phydev->state = PHY_READY;

	if (phydev->drv->probe)
		err = phydev->drv->probe(phydev);

	mutex_unlock(&phydev->lock);

	return err;

}

static int phy_remove(struct device *dev)
{
	struct phy_device *phydev;

	phydev = to_phy_device(dev);

	mutex_lock(&phydev->lock);
	phydev->state = PHY_DOWN;
	mutex_unlock(&phydev->lock);

	if (phydev->drv->remove)
		phydev->drv->remove(phydev);

	put_driver(dev->driver);
	phydev->drv = NULL;

	return 0;
}

/**
 * phy_driver_register - register a phy_driver with the PHY layer
 * @new_driver: new phy_driver to register
 */
int phy_driver_register(struct phy_driver *new_driver)
{
	int retval;

	new_driver->driver.name = new_driver->name;
	new_driver->driver.bus = &mdio_bus_type;
	new_driver->driver.probe = phy_probe;
	new_driver->driver.remove = phy_remove;

	retval = driver_register(&new_driver->driver);

	if (retval) {
		printk(KERN_ERR "%s: Error %d in registering driver\n",
				new_driver->name, retval);

		return retval;
	}

	pr_debug("%s: Registered new driver\n", new_driver->name);

	return 0;
}
EXPORT_SYMBOL(phy_driver_register);

void phy_driver_unregister(struct phy_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(phy_driver_unregister);

static struct phy_driver genphy_driver = {
	.phy_id		= 0xffffffff,
	.phy_id_mask	= 0xffffffff,
	.name		= "Generic PHY",
	.config_init	= genphy_config_init,
	.features	= 0,
	.config_aneg	= genphy_config_aneg,
	.read_status	= genphy_read_status,
	.suspend	= genphy_suspend,
	.resume		= genphy_resume,
	.driver		= {.owner= THIS_MODULE, },
};

static int __init phy_init(void)
{
	int rc;

	rc = mdio_bus_init();
	if (rc)
		return rc;

	rc = phy_driver_register(&genphy_driver);
	if (rc)
		mdio_bus_exit();

	return rc;
}

static void __exit phy_exit(void)
{
	phy_driver_unregister(&genphy_driver);
	mdio_bus_exit();
}

subsys_initcall(phy_init);
module_exit(phy_exit);