aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-hub.c
blob: 38fe076231522875bec58c60ec74fc7b14932960 (plain)
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
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
/*
 * Copyright (C) 2001-2004 by David Brownell
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

/*-------------------------------------------------------------------------*/

/*
 * EHCI Root Hub ... the nonsharable stuff
 *
 * Registers don't need cpu_to_le32, that happens transparently
 */

/*-------------------------------------------------------------------------*/
#include <linux/usb/otg.h>

#define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)

#ifdef	CONFIG_PM

static int ehci_hub_control(
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
);

/* After a power loss, ports that were owned by the companion must be
 * reset so that the companion can still own them.
 */
static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
{
	u32 __iomem	*reg;
	u32		status;
	int		port;
	__le32		buf;
	struct usb_hcd	*hcd = ehci_to_hcd(ehci);

	if (!ehci->owned_ports)
		return;

	/* Give the connections some time to appear */
	msleep(20);

	port = HCS_N_PORTS(ehci->hcs_params);
	while (port--) {
		if (test_bit(port, &ehci->owned_ports)) {
			reg = &ehci->regs->port_status[port];
			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;

			/* Port already owned by companion? */
			if (status & PORT_OWNER)
				clear_bit(port, &ehci->owned_ports);
			else if (test_bit(port, &ehci->companion_ports))
				ehci_writel(ehci, status & ~PORT_PE, reg);
			else
				ehci_hub_control(hcd, SetPortFeature,
						USB_PORT_FEAT_RESET, port + 1,
						NULL, 0);
		}
	}

	if (!ehci->owned_ports)
		return;
	msleep(90);		/* Wait for resets to complete */

	port = HCS_N_PORTS(ehci->hcs_params);
	while (port--) {
		if (test_bit(port, &ehci->owned_ports)) {
			ehci_hub_control(hcd, GetPortStatus,
					0, port + 1,
					(char *) &buf, sizeof(buf));

			/* The companion should now own the port,
			 * but if something went wrong the port must not
			 * remain enabled.
			 */
			reg = &ehci->regs->port_status[port];
			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
			if (status & PORT_OWNER)
				ehci_writel(ehci, status | PORT_CSC, reg);
			else {
				ehci_dbg(ehci, "failed handover port %d: %x\n",
						port + 1, status);
				ehci_writel(ehci, status & ~PORT_PE, reg);
			}
		}
	}

	ehci->owned_ports = 0;
}

static int __maybe_unused ehci_port_change(struct ehci_hcd *ehci)
{
	int i = HCS_N_PORTS(ehci->hcs_params);

	/* First check if the controller indicates a change event */

	if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
		return 1;

	/*
	 * Not all controllers appear to update this while going from D3 to D0,
	 * so check the individual port status registers as well
	 */

	while (i--)
		if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
			return 1;

	return 0;
}

static __maybe_unused void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
		bool suspending, bool do_wakeup)
{
	int		port;
	u32		temp;
	unsigned long	flags;

	/* If remote wakeup is enabled for the root hub but disabled
	 * for the controller, we must adjust all the port wakeup flags
	 * when the controller is suspended or resumed.  In all other
	 * cases they don't need to be changed.
	 */
	if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
		return;

	spin_lock_irqsave(&ehci->lock, flags);

	/* clear phy low-power mode before changing wakeup flags */
	if (ehci->has_hostpc) {
		port = HCS_N_PORTS(ehci->hcs_params);
		while (port--) {
			u32 __iomem	*hostpc_reg;

			hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
					+ HOSTPC0 + 4 * port);
			temp = ehci_readl(ehci, hostpc_reg);
			ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
		}
		spin_unlock_irqrestore(&ehci->lock, flags);
		msleep(5);
		spin_lock_irqsave(&ehci->lock, flags);
	}

	port = HCS_N_PORTS(ehci->hcs_params);
	while (port--) {
		u32 __iomem	*reg = &ehci->regs->port_status[port];
		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
		u32		t2 = t1 & ~PORT_WAKE_BITS;

		/* If we are suspending the controller, clear the flags.
		 * If we are resuming the controller, set the wakeup flags.
		 */
		if (!suspending) {
			if (t1 & PORT_CONNECT)
				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
			else
				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
		}
		ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
				port + 1, t1, t2);
		ehci_writel(ehci, t2, reg);
	}

	/* enter phy low-power mode again */
	if (ehci->has_hostpc) {
		port = HCS_N_PORTS(ehci->hcs_params);
		while (port--) {
			u32 __iomem	*hostpc_reg;

			hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
					+ HOSTPC0 + 4 * port);
			temp = ehci_readl(ehci, hostpc_reg);
			ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
		}
	}

	/* Does the root hub have a port wakeup pending? */
	if (!suspending && ehci_port_change(ehci))
		usb_hcd_resume_root_hub(ehci_to_hcd(ehci));

	spin_unlock_irqrestore(&ehci->lock, flags);
}

static int ehci_bus_suspend (struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
	int			port;
	int			mask;
	int			changed;

	ehci_dbg(ehci, "suspend root hub\n");

	if (time_before (jiffies, ehci->next_statechange))
		msleep(5);
	del_timer_sync(&ehci->watchdog);
	del_timer_sync(&ehci->iaa_watchdog);

	spin_lock_irq (&ehci->lock);

	/* Once the controller is stopped, port resumes that are already
	 * in progress won't complete.  Hence if remote wakeup is enabled
	 * for the root hub and any ports are in the middle of a resume or
	 * remote wakeup, we must fail the suspend.
	 */
	if (hcd->self.root_hub->do_remote_wakeup) {
		if (ehci->resuming_ports) {
			spin_unlock_irq(&ehci->lock);
			ehci_dbg(ehci, "suspend failed because a port is resuming\n");
			return -EBUSY;
		}
	}

	/* stop schedules, clean any completed work */
	if (ehci->rh_state == EHCI_RH_RUNNING)
		ehci_quiesce (ehci);
	ehci->command = ehci_readl(ehci, &ehci->regs->command);
	ehci_work(ehci);

	/* Unlike other USB host controller types, EHCI doesn't have
	 * any notion of "global" or bus-wide suspend.  The driver has
	 * to manually suspend all the active unsuspended ports, and
	 * then manually resume them in the bus_resume() routine.
	 */
	ehci->bus_suspended = 0;
	ehci->owned_ports = 0;
	changed = 0;
	port = HCS_N_PORTS(ehci->hcs_params);
	while (port--) {
		u32 __iomem	*reg = &ehci->regs->port_status [port];
		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
		u32		t2 = t1 & ~PORT_WAKE_BITS;

		/* keep track of which ports we suspend */
		if (t1 & PORT_OWNER)
			set_bit(port, &ehci->owned_ports);
		else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
			t2 |= PORT_SUSPEND;
			set_bit(port, &ehci->bus_suspended);
		}

		/* enable remote wakeup on all ports, if told to do so */
		if (hcd->self.root_hub->do_remote_wakeup) {
			/* only enable appropriate wake bits, otherwise the
			 * hardware can not go phy low power mode. If a race
			 * condition happens here(connection change during bits
			 * set), the port change detection will finally fix it.
			 */
			if (t1 & PORT_CONNECT)
				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
			else
				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
		}

		if (t1 != t2) {
			ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
				port + 1, t1, t2);
			ehci_writel(ehci, t2, reg);
			changed = 1;
		}
	}

	if (changed && ehci->has_hostpc) {
		spin_unlock_irq(&ehci->lock);
		msleep(5);	/* 5 ms for HCD to enter low-power mode */
		spin_lock_irq(&ehci->lock);

		port = HCS_N_PORTS(ehci->hcs_params);
		while (port--) {
			u32 __iomem	*hostpc_reg;
			u32		t3;

			hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
					+ HOSTPC0 + 4 * port);
			t3 = ehci_readl(ehci, hostpc_reg);
			ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
			t3 = ehci_readl(ehci, hostpc_reg);
			ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
					port, (t3 & HOSTPC_PHCD) ?
					"succeeded" : "failed");
		}
	}

	/* Apparently some devices need a >= 1-uframe delay here */
	if (ehci->bus_suspended)
		udelay(150);

	/* turn off now-idle HC */
	ehci_halt (ehci);
	ehci->rh_state = EHCI_RH_SUSPENDED;

	if (ehci->reclaim)
		end_unlink_async(ehci);

	/* allow remote wakeup */
	mask = INTR_MASK;
	if (!hcd->self.root_hub->do_remote_wakeup)
		mask &= ~STS_PCD;
	ehci_writel(ehci, mask, &ehci->regs->intr_enable);
	ehci_readl(ehci, &ehci->regs->intr_enable);

	ehci->next_statechange = jiffies + msecs_to_jiffies(10);
	spin_unlock_irq (&ehci->lock);

	/* ehci_work() may have re-enabled the watchdog timer, which we do not
	 * want, and so we must delete any pending watchdog timer events.
	 */
	del_timer_sync(&ehci->watchdog);
	return 0;
}


/* caller has locked the root hub, and should reset/reinit on error */
static int ehci_bus_resume (struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
	u32			temp;
	u32			power_okay;
	int			i;
	unsigned long		resume_needed = 0;

	if (time_before (jiffies, ehci->next_statechange))
		msleep(5);
	spin_lock_irq (&ehci->lock);
	if (!HCD_HW_ACCESSIBLE(hcd)) {
		spin_unlock_irq(&ehci->lock);
		return -ESHUTDOWN;
	}

	if (unlikely(ehci->debug)) {
		if (!dbgp_reset_prep())
			ehci->debug = NULL;
		else
			dbgp_external_startup();
	}

	/* Ideally and we've got a real resume here, and no port's power
	 * was lost.  (For PCI, that means Vaux was maintained.)  But we
	 * could instead be restoring a swsusp snapshot -- so that BIOS was
	 * the last user of the controller, not reset/pm hardware keeping
	 * state we gave to it.
	 */
	power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
	ehci_dbg(ehci, "resume root hub%s\n",
			power_okay ? "" : " after power loss");

	/* at least some APM implementations will try to deliver
	 * IRQs right away, so delay them until we're ready.
	 */
	ehci_writel(ehci, 0, &ehci->regs->intr_enable);

	/* re-init operational registers */
	ehci_writel(ehci, 0, &ehci->regs->segment);
	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);

	/* restore CMD_RUN, framelist size, and irq threshold */
	ehci_writel(ehci, ehci->command, &ehci->regs->command);
	ehci->rh_state = EHCI_RH_RUNNING;

	/* Some controller/firmware combinations need a delay during which
	 * they set up the port statuses.  See Bugzilla #8190. */
	spin_unlock_irq(&ehci->lock);
	msleep(8);
	spin_lock_irq(&ehci->lock);

	/* clear phy low-power mode before resume */
	if (ehci->bus_suspended && ehci->has_hostpc) {
		i = HCS_N_PORTS(ehci->hcs_params);
		while (i--) {
			if (test_bit(i, &ehci->bus_suspended)) {
				u32 __iomem	*hostpc_reg;

				hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
						+ HOSTPC0 + 4 * i);
				temp = ehci_readl(ehci, hostpc_reg);
				ehci_writel(ehci, temp & ~HOSTPC_PHCD,
						hostpc_reg);
			}
		}
		spin_unlock_irq(&ehci->lock);
		msleep(5);
		spin_lock_irq(&ehci->lock);
	}

	/* manually resume the ports we suspended during bus_suspend() */
	i = HCS_N_PORTS (ehci->hcs_params);
	while (i--) {
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
		temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
		if (test_bit(i, &ehci->bus_suspended) &&
				(temp & PORT_SUSPEND)) {
			temp |= PORT_RESUME;
			set_bit(i, &resume_needed);
		}
		ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
	}

	/* msleep for 20ms only if code is trying to resume port */
	if (resume_needed) {
		spin_unlock_irq(&ehci->lock);
		msleep(20);
		spin_lock_irq(&ehci->lock);
	}

	i = HCS_N_PORTS (ehci->hcs_params);
	while (i--) {
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
		if (test_bit(i, &resume_needed)) {
			temp &= ~(PORT_RWC_BITS | PORT_RESUME);
			ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
			ehci_vdbg (ehci, "resumed port %d\n", i + 1);
		}
	}
	(void) ehci_readl(ehci, &ehci->regs->command);

	/* maybe re-activate the schedule(s) */
	temp = 0;
	if (ehci->async->qh_next.qh)
		temp |= CMD_ASE;
	if (ehci->periodic_sched)
		temp |= CMD_PSE;
	if (temp) {
		ehci->command |= temp;
		ehci_writel(ehci, ehci->command, &ehci->regs->command);
	}

	ehci->next_statechange = jiffies + msecs_to_jiffies(5);

	/* Now we can safely re-enable irqs */
	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);

	spin_unlock_irq (&ehci->lock);
	ehci_handover_companion_ports(ehci);
	return 0;
}

#else

#define ehci_bus_suspend	NULL
#define ehci_bus_resume		NULL

#endif	/* CONFIG_PM */

/*-------------------------------------------------------------------------*/

/*
 * Sets the owner of a port
 */
static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
{
	u32 __iomem		*status_reg;
	u32			port_status;
	int 			try;

	status_reg = &ehci->regs->port_status[portnum];

	/*
	 * The controller won't set the OWNER bit if the port is
	 * enabled, so this loop will sometimes require at least two
	 * iterations: one to disable the port and one to set OWNER.
	 */
	for (try = 4; try > 0; --try) {
		spin_lock_irq(&ehci->lock);
		port_status = ehci_readl(ehci, status_reg);
		if ((port_status & PORT_OWNER) == new_owner
				|| (port_status & (PORT_OWNER | PORT_CONNECT))
					== 0)
			try = 0;
		else {
			port_status ^= PORT_OWNER;
			port_status &= ~(PORT_PE | PORT_RWC_BITS);
			ehci_writel(ehci, port_status, status_reg);
		}
		spin_unlock_irq(&ehci->lock);
		if (try > 1)
			msleep(5);
	}
}

/*-------------------------------------------------------------------------*/

static int check_reset_complete (
	struct ehci_hcd	*ehci,
	int		index,
	u32 __iomem	*status_reg,
	int		port_status
) {
	if (!(port_status & PORT_CONNECT))
		return port_status;

	/* if reset finished and it's still not enabled -- handoff */
	if (!(port_status & PORT_PE)) {

		/* with integrated TT, there's nobody to hand it to! */
		if (ehci_is_TDI(ehci)) {
			ehci_dbg (ehci,
				"Failed to enable port %d on root hub TT\n",
				index+1);
			return port_status;
		}

		ehci_dbg (ehci, "port %d full speed --> companion\n",
			index + 1);

		// what happens if HCS_N_CC(params) == 0 ?
		port_status |= PORT_OWNER;
		port_status &= ~PORT_RWC_BITS;
		ehci_writel(ehci, port_status, status_reg);

		/* ensure 440EPX ohci controller state is operational */
		if (ehci->has_amcc_usb23)
			set_ohci_hcfs(ehci, 1);
	} else {
		ehci_dbg (ehci, "port %d high speed\n", index + 1);
		/* ensure 440EPx ohci controller state is suspended */
		if (ehci->has_amcc_usb23)
			set_ohci_hcfs(ehci, 0);
	}

	return port_status;
}

/*-------------------------------------------------------------------------*/


/* build "status change" packet (one or two bytes) from HC registers */

static int
ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
	u32		temp, status;
	u32		mask;
	int		ports, i, retval = 1;
	unsigned long	flags;
	u32		ppcd = 0;

	/* init status to no-changes */
	buf [0] = 0;
	ports = HCS_N_PORTS (ehci->hcs_params);
	if (ports > 7) {
		buf [1] = 0;
		retval++;
	}

	/* Inform the core about resumes-in-progress by returning
	 * a non-zero value even if there are no status changes.
	 */
	status = ehci->resuming_ports;

	/* Some boards (mostly VIA?) report bogus overcurrent indications,
	 * causing massive log spam unless we completely ignore them.  It
	 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
	 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
	 * PORT_POWER; that's surprising, but maybe within-spec.
	 */
	if (!ignore_oc)
		mask = PORT_CSC | PORT_PEC | PORT_OCC;
	else
		mask = PORT_CSC | PORT_PEC;
	// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND

	/* no hub change reports (bit 0) for now (power, ...) */

	/* port N changes (bit N)? */
	spin_lock_irqsave (&ehci->lock, flags);

	/* get per-port change detect bits */
	if (ehci->has_ppcd)
		ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;

	for (i = 0; i < ports; i++) {
		/* leverage per-port change bits feature */
		if (ehci->has_ppcd && !(ppcd & (1 << i)))
			continue;
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);

		/*
		 * Return status information even for ports with OWNER set.
		 * Otherwise khubd wouldn't see the disconnect event when a
		 * high-speed device is switched over to the companion
		 * controller by the user.
		 */

		if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
				|| (ehci->reset_done[i] && time_after_eq(
					jiffies, ehci->reset_done[i]))) {
			if (i < 7)
			    buf [0] |= 1 << (i + 1);
			else
			    buf [1] |= 1 << (i - 7);
			status = STS_PCD;
		}
	}
	/* FIXME autosuspend idle root hubs */
	spin_unlock_irqrestore (&ehci->lock, flags);
	return status ? retval : 0;
}

/*-------------------------------------------------------------------------*/

static void
ehci_hub_descriptor (
	struct ehci_hcd			*ehci,
	struct usb_hub_descriptor	*desc
) {
	int		ports = HCS_N_PORTS (ehci->hcs_params);
	u16		temp;

	desc->bDescriptorType = 0x29;
	desc->bPwrOn2PwrGood = 10;	/* ehci 1.0, 2.3.9 says 20ms max */
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 1 + (ports / 8);
	desc->bDescLength = 7 + 2 * temp;

	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
	memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);

	temp = 0x0008;			/* per-port overcurrent reporting */
	if (HCS_PPC (ehci->hcs_params))
		temp |= 0x0001;		/* per-port power control */
	else
		temp |= 0x0002;		/* no power switching */
#if 0
// re-enable when we support USB_PORT_FEAT_INDICATOR below.
	if (HCS_INDICATOR (ehci->hcs_params))
		temp |= 0x0080;		/* per-port indicators (LEDs) */
#endif
	desc->wHubCharacteristics = cpu_to_le16(temp);
}

/*-------------------------------------------------------------------------*/

static int ehci_hub_control (
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
) {
	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
	int		ports = HCS_N_PORTS (ehci->hcs_params);
	u32 __iomem	*status_reg = &ehci->regs->port_status[
				(wIndex & 0xff) - 1];
	u32 __iomem	*hostpc_reg = NULL;
	u32		temp, temp1, status;
	unsigned long	flags;
	int		retval = 0;
	unsigned	selector;

	/*
	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
	 * (track current state ourselves) ... blink for diagnostics,
	 * power, "this is the one", etc.  EHCI spec supports this.
	 */

	if (ehci->has_hostpc)
		hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
				+ HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
	spin_lock_irqsave (&ehci->lock, flags);
	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = ehci_readl(ehci, status_reg);

		/*
		 * Even if OWNER is set, so the port is owned by the
		 * companion controller, khubd needs to be able to clear
		 * the port-change status bits (especially
		 * USB_PORT_STAT_C_CONNECTION).
		 */

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			ehci_writel(ehci, temp & ~PORT_PE, status_reg);
			break;
		case USB_PORT_FEAT_C_ENABLE:
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
					status_reg);
			break;
		case USB_PORT_FEAT_SUSPEND:
			if (temp & PORT_RESET)
				goto error;
			if (ehci->no_selective_suspend)
				break;
#ifdef CONFIG_USB_OTG
			if ((hcd->self.otg_port == (wIndex + 1))
			    && hcd->self.b_hnp_enable) {
				otg_start_hnp(ehci->transceiver->otg);
				break;
			}
#endif
			if (!(temp & PORT_SUSPEND))
				break;
			if ((temp & PORT_PE) == 0)
				goto error;

			/* clear phy low-power mode before resume */
			if (hostpc_reg) {
				temp1 = ehci_readl(ehci, hostpc_reg);
				ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
						hostpc_reg);
				spin_unlock_irqrestore(&ehci->lock, flags);
				msleep(5);/* wait to leave low-power mode */
				spin_lock_irqsave(&ehci->lock, flags);
			}
			/* resume signaling for 20 msec */
			temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
			ehci_writel(ehci, temp | PORT_RESUME, status_reg);
			ehci->reset_done[wIndex] = jiffies
					+ msecs_to_jiffies(20);
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			clear_bit(wIndex, &ehci->port_c_suspend);
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				ehci_writel(ehci,
					  temp & ~(PORT_RWC_BITS | PORT_POWER),
					  status_reg);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
			if (ehci->has_lpm) {
				/* clear PORTSC bits on disconnect */
				temp &= ~PORT_LPM;
				temp &= ~PORT_DEV_ADDR;
			}
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
					status_reg);
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
					status_reg);
			break;
		case USB_PORT_FEAT_C_RESET:
			/* GetPortStatus clears reset */
			break;
		default:
			goto error;
		}
		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted write */
		break;
	case GetHubDescriptor:
		ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
			buf);
		break;
	case GetHubStatus:
		/* no hub-wide feature/status flags */
		memset (buf, 0, 4);
		//cpu_to_le32s ((u32 *) buf);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
		temp = ehci_readl(ehci, status_reg);

		// wPortChange bits
		if (temp & PORT_CSC)
			status |= USB_PORT_STAT_C_CONNECTION << 16;
		if (temp & PORT_PEC)
			status |= USB_PORT_STAT_C_ENABLE << 16;

		if ((temp & PORT_OCC) && !ignore_oc){
			status |= USB_PORT_STAT_C_OVERCURRENT << 16;

			/*
			 * Hubs should disable port power on over-current.
			 * However, not all EHCI implementations do this
			 * automatically, even if they _do_ support per-port
			 * power switching; they're allowed to just limit the
			 * current.  khubd will turn the power back on.
			 */
			if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
				ehci_writel(ehci,
					temp & ~(PORT_RWC_BITS | PORT_POWER),
					status_reg);
				temp = ehci_readl(ehci, status_reg);
			}
		}

		/* whoever resumes must GetPortStatus to complete it!! */
		if (temp & PORT_RESUME) {

			/* Remote Wakeup received? */
			if (!ehci->reset_done[wIndex]) {
				/* resume signaling for 20 msec */
				ehci->reset_done[wIndex] = jiffies
						+ msecs_to_jiffies(20);
				/* check the port again */
				mod_timer(&ehci_to_hcd(ehci)->rh_timer,
						ehci->reset_done[wIndex]);
			}

			/* resume completed? */
			else if (time_after_eq(jiffies,
					ehci->reset_done[wIndex])) {
				clear_bit(wIndex, &ehci->suspended_ports);
				set_bit(wIndex, &ehci->port_c_suspend);
				ehci->reset_done[wIndex] = 0;

				/* stop resume signaling */
				temp = ehci_readl(ehci, status_reg);
				ehci_writel(ehci,
					temp & ~(PORT_RWC_BITS | PORT_RESUME),
					status_reg);
				clear_bit(wIndex, &ehci->resuming_ports);
				retval = handshake(ehci, status_reg,
					   PORT_RESUME, 0, 2000 /* 2msec */);
				if (retval != 0) {
					ehci_err(ehci,
						"port %d resume error %d\n",
						wIndex + 1, retval);
					goto error;
				}
				temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
			}
		}

		/* whoever resets must GetPortStatus to complete it!! */
		if ((temp & PORT_RESET)
				&& time_after_eq(jiffies,
					ehci->reset_done[wIndex])) {
			status |= USB_PORT_STAT_C_RESET << 16;
			ehci->reset_done [wIndex] = 0;
			clear_bit(wIndex, &ehci->resuming_ports);

			/* force reset to complete */
			ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
					status_reg);
			/* REVISIT:  some hardware needs 550+ usec to clear
			 * this bit; seems too long to spin routinely...
			 */
			retval = handshake(ehci, status_reg,
					PORT_RESET, 0, 1000);
			if (retval != 0) {
				ehci_err (ehci, "port %d reset error %d\n",
					wIndex + 1, retval);
				goto error;
			}

			/* see what we found out */
			temp = check_reset_complete (ehci, wIndex, status_reg,
					ehci_readl(ehci, status_reg));
		}

		if (!(temp & (PORT_RESUME|PORT_RESET))) {
			ehci->reset_done[wIndex] = 0;
			clear_bit(wIndex, &ehci->resuming_ports);
		}

		/* transfer dedicated ports to the companion hc */
		if ((temp & PORT_CONNECT) &&
				test_bit(wIndex, &ehci->companion_ports)) {
			temp &= ~PORT_RWC_BITS;
			temp |= PORT_OWNER;
			ehci_writel(ehci, temp, status_reg);
			ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
			temp = ehci_readl(ehci, status_reg);
		}

		/*
		 * Even if OWNER is set, there's no harm letting khubd
		 * see the wPortStatus values (they should all be 0 except
		 * for PORT_POWER anyway).
		 */

		if (temp & PORT_CONNECT) {
			status |= USB_PORT_STAT_CONNECTION;
			// status may be from integrated TT
			if (ehci->has_hostpc) {
				temp1 = ehci_readl(ehci, hostpc_reg);
				status |= ehci_port_speed(ehci, temp1);
			} else
				status |= ehci_port_speed(ehci, temp);
		}
		if (temp & PORT_PE)
			status |= USB_PORT_STAT_ENABLE;

		/* maybe the port was unsuspended without our knowledge */
		if (temp & (PORT_SUSPEND|PORT_RESUME)) {
			status |= USB_PORT_STAT_SUSPEND;
		} else if (test_bit(wIndex, &ehci->suspended_ports)) {
			clear_bit(wIndex, &ehci->suspended_ports);
			clear_bit(wIndex, &ehci->resuming_ports);
			ehci->reset_done[wIndex] = 0;
			if (temp & PORT_PE)
				set_bit(wIndex, &ehci->port_c_suspend);
		}

		if (temp & PORT_OC)
			status |= USB_PORT_STAT_OVERCURRENT;
		if (temp & PORT_RESET)
			status |= USB_PORT_STAT_RESET;
		if (temp & PORT_POWER)
			status |= USB_PORT_STAT_POWER;
		if (test_bit(wIndex, &ehci->port_c_suspend))
			status |= USB_PORT_STAT_C_SUSPEND << 16;

#ifndef	VERBOSE_DEBUG
	if (status & ~0xffff)	/* only if wPortChange is interesting */
#endif
		dbg_port (ehci, "GetStatus", wIndex + 1, temp);
		put_unaligned_le32(status, buf);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		selector = wIndex >> 8;
		wIndex &= 0xff;
		if (unlikely(ehci->debug)) {
			/* If the debug port is active any port
			 * feature requests should get denied */
			if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
			    (readl(&ehci->debug->control) & DBGP_ENABLED)) {
				retval = -ENODEV;
				goto error_exit;
			}
		}
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = ehci_readl(ehci, status_reg);
		if (temp & PORT_OWNER)
			break;

		temp &= ~PORT_RWC_BITS;
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			if (ehci->no_selective_suspend)
				break;
			if ((temp & PORT_PE) == 0
					|| (temp & PORT_RESET) != 0)
				goto error;

			/* After above check the port must be connected.
			 * Set appropriate bit thus could put phy into low power
			 * mode if we have hostpc feature
			 */
			temp &= ~PORT_WKCONN_E;
			temp |= PORT_WKDISC_E | PORT_WKOC_E;
			ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
			if (hostpc_reg) {
				spin_unlock_irqrestore(&ehci->lock, flags);
				msleep(5);/* 5ms for HCD enter low pwr mode */
				spin_lock_irqsave(&ehci->lock, flags);
				temp1 = ehci_readl(ehci, hostpc_reg);
				ehci_writel(ehci, temp1 | HOSTPC_PHCD,
					hostpc_reg);
				temp1 = ehci_readl(ehci, hostpc_reg);
				ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
					wIndex, (temp1 & HOSTPC_PHCD) ?
					"succeeded" : "failed");
			}
			set_bit(wIndex, &ehci->suspended_ports);
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				ehci_writel(ehci, temp | PORT_POWER,
						status_reg);
			break;
		case USB_PORT_FEAT_RESET:
			if (temp & PORT_RESUME)
				goto error;
			/* line status bits may report this as low speed,
			 * which can be fine if this root hub has a
			 * transaction translator built in.
			 */
			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
					&& !ehci_is_TDI(ehci)
					&& PORT_USB11 (temp)) {
				ehci_dbg (ehci,
					"port %d low speed --> companion\n",
					wIndex + 1);
				temp |= PORT_OWNER;
			} else {
				ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
				temp |= PORT_RESET;
				temp &= ~PORT_PE;

				/*
				 * caller must wait, then call GetPortStatus
				 * usb 2.0 spec says 50 ms resets on root
				 */
				ehci->reset_done [wIndex] = jiffies
						+ msecs_to_jiffies (50);
			}
			ehci_writel(ehci, temp, status_reg);
			break;

		/* For downstream facing ports (these):  one hub port is put
		 * into test mode according to USB2 11.24.2.13, then the hub
		 * must be reset (which for root hub now means rmmod+modprobe,
		 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
		 * about the EHCI-specific stuff.
		 */
		case USB_PORT_FEAT_TEST:
			if (!selector || selector > 5)
				goto error;
			ehci_quiesce(ehci);

			/* Put all enabled ports into suspend */
			while (ports--) {
				u32 __iomem *sreg =
						&ehci->regs->port_status[ports];

				temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
				if (temp & PORT_PE)
					ehci_writel(ehci, temp | PORT_SUSPEND,
							sreg);
			}
			ehci_halt(ehci);
			temp = ehci_readl(ehci, status_reg);
			temp |= selector << 16;
			ehci_writel(ehci, temp, status_reg);
			break;

		default:
			goto error;
		}
		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
		break;

	default:
error:
		/* "stall" on error */
		retval = -EPIPE;
	}
error_exit:
	spin_unlock_irqrestore (&ehci->lock, flags);
	return retval;
}

static void __maybe_unused ehci_relinquish_port(struct usb_hcd *hcd,
		int portnum)
{
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);

	if (ehci_is_TDI(ehci))
		return;
	set_owner(ehci, --portnum, PORT_OWNER);
}

static int __maybe_unused ehci_port_handed_over(struct usb_hcd *hcd,
		int portnum)
{
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
	u32 __iomem		*reg;

	if (ehci_is_TDI(ehci))
		return 0;
	reg = &ehci->regs->port_status[portnum - 1];
	return ehci_readl(ehci, reg) & PORT_OWNER;
}