summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-dbg.c
blob: 40a844c1dbb4945044a9afe2d94d2097bad29af3 (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
/*
 * Copyright (c) 2001-2002 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 */

#define ehci_dbg(ehci, fmt, args...) \
	dev_dbg (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_err(ehci, fmt, args...) \
	dev_err (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_info(ehci, fmt, args...) \
	dev_info (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_warn(ehci, fmt, args...) \
	dev_warn (ehci_to_hcd(ehci)->self.controller , fmt , ## args )

#ifdef VERBOSE_DEBUG
#	define ehci_vdbg ehci_dbg
#else
	static inline void ehci_vdbg(struct ehci_hcd *ehci, ...) {}
#endif

#ifdef	DEBUG

/* check the values in the HCSPARAMS register
 * (host controller _Structural_ parameters)
 * see EHCI spec, Table 2-4 for each value
 */
static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
{
	u32	params = ehci_readl(ehci, &ehci->caps->hcs_params);

	ehci_dbg (ehci,
		"%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
		label, params,
		HCS_DEBUG_PORT (params),
		HCS_INDICATOR (params) ? " ind" : "",
		HCS_N_CC (params),
		HCS_N_PCC (params),
		HCS_PORTROUTED (params) ? "" : " ordered",
		HCS_PPC (params) ? "" : " !ppc",
		HCS_N_PORTS (params)
		);
	/* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
	if (HCS_PORTROUTED (params)) {
		int i;
		char buf [46], tmp [7], byte;

		buf[0] = 0;
		for (i = 0; i < HCS_N_PORTS (params); i++) {
			// FIXME MIPS won't readb() ...
			byte = readb (&ehci->caps->portroute[(i>>1)]);
			sprintf(tmp, "%d ",
				((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
			strcat(buf, tmp);
		}
		ehci_dbg (ehci, "%s portroute %s\n",
				label, buf);
	}
}
#else

static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

/* check the values in the HCCPARAMS register
 * (host controller _Capability_ parameters)
 * see EHCI Spec, Table 2-5 for each value
 * */
static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
{
	u32	params = ehci_readl(ehci, &ehci->caps->hcc_params);

	if (HCC_ISOC_CACHE (params)) {
		ehci_dbg (ehci,
			"%s hcc_params %04x caching frame %s%s%s\n",
			label, params,
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
	} else {
		ehci_dbg (ehci,
			"%s hcc_params %04x thresh %d uframes %s%s%s%s%s%s%s\n",
			label,
			params,
			HCC_ISOC_THRES(params),
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "",
			HCC_LPM(params) ? " LPM" : "",
			HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
			HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
			HCC_32FRAME_PERIODIC_LIST(params) ?
				" 32 peridic list" : "");
	}
}
#else

static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

static void __maybe_unused
dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
{
	ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
		hc32_to_cpup(ehci, &qtd->hw_next),
		hc32_to_cpup(ehci, &qtd->hw_alt_next),
		hc32_to_cpup(ehci, &qtd->hw_token),
		hc32_to_cpup(ehci, &qtd->hw_buf [0]));
	if (qtd->hw_buf [1])
		ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
			hc32_to_cpup(ehci, &qtd->hw_buf[1]),
			hc32_to_cpup(ehci, &qtd->hw_buf[2]),
			hc32_to_cpup(ehci, &qtd->hw_buf[3]),
			hc32_to_cpup(ehci, &qtd->hw_buf[4]));
}

static void __maybe_unused
dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{
	struct ehci_qh_hw *hw = qh->hw;

	ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
		qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
	dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
}

static void __maybe_unused
dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
{
	ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
		label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
		itd->urb);
	ehci_dbg (ehci,
		"  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
		hc32_to_cpu(ehci, itd->hw_transaction[0]),
		hc32_to_cpu(ehci, itd->hw_transaction[1]),
		hc32_to_cpu(ehci, itd->hw_transaction[2]),
		hc32_to_cpu(ehci, itd->hw_transaction[3]),
		hc32_to_cpu(ehci, itd->hw_transaction[4]),
		hc32_to_cpu(ehci, itd->hw_transaction[5]),
		hc32_to_cpu(ehci, itd->hw_transaction[6]),
		hc32_to_cpu(ehci, itd->hw_transaction[7]));
	ehci_dbg (ehci,
		"  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
		hc32_to_cpu(ehci, itd->hw_bufp[0]),
		hc32_to_cpu(ehci, itd->hw_bufp[1]),
		hc32_to_cpu(ehci, itd->hw_bufp[2]),
		hc32_to_cpu(ehci, itd->hw_bufp[3]),
		hc32_to_cpu(ehci, itd->hw_bufp[4]),
		hc32_to_cpu(ehci, itd->hw_bufp[5]),
		hc32_to_cpu(ehci, itd->hw_bufp[6]));
	ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
		itd->index[0], itd->index[1], itd->index[2],
		itd->index[3], itd->index[4], itd->index[5],
		itd->index[6], itd->index[7]);
}

static void __maybe_unused
dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
{
	ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
		label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
		sitd->urb);
	ehci_dbg (ehci,
		"  addr %08x sched %04x result %08x buf %08x %08x\n",
		hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
		hc32_to_cpu(ehci, sitd->hw_uframe),
		hc32_to_cpu(ehci, sitd->hw_results),
		hc32_to_cpu(ehci, sitd->hw_buf[0]),
		hc32_to_cpu(ehci, sitd->hw_buf[1]));
}

static int __maybe_unused
dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{
	return scnprintf (buf, len,
		"%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
		label, label [0] ? " " : "", status,
		(status & STS_PPCE_MASK) ? " PPCE" : "",
		(status & STS_ASS) ? " Async" : "",
		(status & STS_PSS) ? " Periodic" : "",
		(status & STS_RECL) ? " Recl" : "",
		(status & STS_HALT) ? " Halt" : "",
		(status & STS_IAA) ? " IAA" : "",
		(status & STS_FATAL) ? " FATAL" : "",
		(status & STS_FLR) ? " FLR" : "",
		(status & STS_PCD) ? " PCD" : "",
		(status & STS_ERR) ? " ERR" : "",
		(status & STS_INT) ? " INT" : ""
		);
}

static int __maybe_unused
dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{
	return scnprintf (buf, len,
		"%s%sintrenable %02x%s%s%s%s%s%s%s",
		label, label [0] ? " " : "", enable,
		(enable & STS_PPCE_MASK) ? " PPCE" : "",
		(enable & STS_IAA) ? " IAA" : "",
		(enable & STS_FATAL) ? " FATAL" : "",
		(enable & STS_FLR) ? " FLR" : "",
		(enable & STS_PCD) ? " PCD" : "",
		(enable & STS_ERR) ? " ERR" : "",
		(enable & STS_INT) ? " INT" : ""
		);
}

static const char *const fls_strings [] =
    { "1024", "512", "256", "??" };

static int
dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{
	return scnprintf (buf, len,
		"%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
		"period=%s%s %s",
		label, label [0] ? " " : "", command,
		(command & CMD_HIRD) ? " HIRD" : "",
		(command & CMD_PPCEE) ? " PPCEE" : "",
		(command & CMD_FSP) ? " FSP" : "",
		(command & CMD_ASPE) ? " ASPE" : "",
		(command & CMD_PSPE) ? " PSPE" : "",
		(command & CMD_PARK) ? " park" : "(park)",
		CMD_PARK_CNT (command),
		(command >> 16) & 0x3f,
		(command & CMD_LRESET) ? " LReset" : "",
		(command & CMD_IAAD) ? " IAAD" : "",
		(command & CMD_ASE) ? " Async" : "",
		(command & CMD_PSE) ? " Periodic" : "",
		fls_strings [(command >> 2) & 0x3],
		(command & CMD_RESET) ? " Reset" : "",
		(command & CMD_RUN) ? "RUN" : "HALT"
		);
}

static int
dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{
	char	*sig;

	/* signaling state */
	switch (status & (3 << 10)) {
	case 0 << 10: sig = "se0"; break;
	case 1 << 10: sig = "k"; break;		/* low speed */
	case 2 << 10: sig = "j"; break;
	default: sig = "?"; break;
	}

	return scnprintf (buf, len,
		"%s%sport:%d status %06x %d %s%s%s%s%s%s "
		"sig=%s%s%s%s%s%s%s%s%s%s%s",
		label, label [0] ? " " : "", port, status,
		status>>25,/*device address */
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ACK ?
						" ACK" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_NYET ?
						" NYET" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_STALL ?
						" STALL" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ERR ?
						" ERR" : "",
		(status & PORT_POWER) ? " POWER" : "",
		(status & PORT_OWNER) ? " OWNER" : "",
		sig,
		(status & PORT_LPM) ? " LPM" : "",
		(status & PORT_RESET) ? " RESET" : "",
		(status & PORT_SUSPEND) ? " SUSPEND" : "",
		(status & PORT_RESUME) ? " RESUME" : "",
		(status & PORT_OCC) ? " OCC" : "",
		(status & PORT_OC) ? " OC" : "",
		(status & PORT_PEC) ? " PEC" : "",
		(status & PORT_PE) ? " PE" : "",
		(status & PORT_CSC) ? " CSC" : "",
		(status & PORT_CONNECT) ? " CONNECT" : "");
}

#else
static inline void __maybe_unused
dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{}

static inline int __maybe_unused
dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{ return 0; }

static inline int __maybe_unused
dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{ return 0; }

static inline int __maybe_unused
dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{ return 0; }

static inline int __maybe_unused
dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{ return 0; }

#endif	/* DEBUG */

/* functions have the "wrong" filename when they're output... */
#define dbg_status(ehci, label, status) { \
	char _buf [80]; \
	dbg_status_buf (_buf, sizeof _buf, label, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_cmd(ehci, label, command) { \
	char _buf [80]; \
	dbg_command_buf (_buf, sizeof _buf, label, command); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_port(ehci, label, port, status) { \
	char _buf [80]; \
	dbg_port_buf (_buf, sizeof _buf, label, port, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

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

#ifdef STUB_DEBUG_FILES

static inline void create_debug_files (struct ehci_hcd *bus) { }
static inline void remove_debug_files (struct ehci_hcd *bus) { }

#else

/* troubleshooting help: expose state in debugfs */

static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);
static int debug_lpm_open(struct inode *, struct file *);
static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos);
static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
			      size_t count, loff_t *ppos);
static int debug_lpm_close(struct inode *inode, struct file *file);

static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);

static const struct file_operations debug_async_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_async_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};
static const struct file_operations debug_periodic_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_periodic_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};
static const struct file_operations debug_registers_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_registers_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};
static const struct file_operations debug_lpm_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_lpm_open,
	.read		= debug_lpm_read,
	.write		= debug_lpm_write,
	.release	= debug_lpm_close,
	.llseek		= noop_llseek,
};

static struct dentry *ehci_debug_root;

struct debug_buffer {
	ssize_t (*fill_func)(struct debug_buffer *);	/* fill method */
	struct usb_bus *bus;
	struct mutex mutex;	/* protect filling of buffer */
	size_t count;		/* number of characters filled into buffer */
	char *output_buf;
	size_t alloc_size;
};

#define speed_char(info1) ({ char tmp; \
		switch (info1 & (3 << 12)) { \
		case 0 << 12: tmp = 'f'; break; \
		case 1 << 12: tmp = 'l'; break; \
		case 2 << 12: tmp = 'h'; break; \
		default: tmp = '?'; break; \
		}; tmp; })

static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
{
	__u32 v = hc32_to_cpu(ehci, token);

	if (v & QTD_STS_ACTIVE)
		return '*';
	if (v & QTD_STS_HALT)
		return '-';
	if (!IS_SHORT_READ (v))
		return ' ';
	/* tries to advance through hw_alt_next */
	return '/';
}

static void qh_lines (
	struct ehci_hcd *ehci,
	struct ehci_qh *qh,
	char **nextp,
	unsigned *sizep
)
{
	u32			scratch;
	u32			hw_curr;
	struct list_head	*entry;
	struct ehci_qtd		*td;
	unsigned		temp;
	unsigned		size = *sizep;
	char			*next = *nextp;
	char			mark;
	__le32			list_end = EHCI_LIST_END(ehci);
	struct ehci_qh_hw	*hw = qh->hw;

	if (hw->hw_qtd_next == list_end)	/* NEC does this */
		mark = '@';
	else
		mark = token_mark(ehci, hw->hw_token);
	if (mark == '/') {	/* qh_alt_next controls qh advance? */
		if ((hw->hw_alt_next & QTD_MASK(ehci))
				== ehci->async->hw->hw_alt_next)
			mark = '#';	/* blocked */
		else if (hw->hw_alt_next == list_end)
			mark = '.';	/* use hw_qtd_next */
		/* else alt_next points to some other qtd */
	}
	scratch = hc32_to_cpup(ehci, &hw->hw_info1);
	hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
	temp = scnprintf (next, size,
			"qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
			qh, scratch & 0x007f,
			speed_char (scratch),
			(scratch >> 8) & 0x000f,
			scratch, hc32_to_cpup(ehci, &hw->hw_info2),
			hc32_to_cpup(ehci, &hw->hw_token), mark,
			(cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
				? "data1" : "data0",
			(hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
	size -= temp;
	next += temp;

	/* hc may be modifying the list as we read it ... */
	list_for_each (entry, &qh->qtd_list) {
		td = list_entry (entry, struct ehci_qtd, qtd_list);
		scratch = hc32_to_cpup(ehci, &td->hw_token);
		mark = ' ';
		if (hw_curr == td->qtd_dma)
			mark = '*';
		else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
			mark = '+';
		else if (QTD_LENGTH (scratch)) {
			if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
				mark = '#';
			else if (td->hw_alt_next != list_end)
				mark = '/';
		}
		temp = snprintf (next, size,
				"\n\t%p%c%s len=%d %08x urb %p",
				td, mark, ({ char *tmp;
				 switch ((scratch>>8)&0x03) {
				 case 0: tmp = "out"; break;
				 case 1: tmp = "in"; break;
				 case 2: tmp = "setup"; break;
				 default: tmp = "?"; break;
				 } tmp;}),
				(scratch >> 16) & 0x7fff,
				scratch,
				td->urb);
		if (size < temp)
			temp = size;
		size -= temp;
		next += temp;
		if (temp == size)
			goto done;
	}

	temp = snprintf (next, size, "\n");
	if (size < temp)
		temp = size;
	size -= temp;
	next += temp;

done:
	*sizep = size;
	*nextp = next;
}

static ssize_t fill_async_buffer(struct debug_buffer *buf)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size;
	char			*next;
	struct ehci_qh		*qh;

	hcd = bus_to_hcd(buf->bus);
	ehci = hcd_to_ehci (hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	*next = 0;

	/* dumps a snapshot of the async schedule.
	 * usually empty except for long-term bulk reads, or head.
	 * one QH per line, and TDs we know about
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
		qh_lines (ehci, qh, &next, &size);
	if (ehci->reclaim && size > 0) {
		temp = scnprintf (next, size, "\nreclaim =\n");
		size -= temp;
		next += temp;

		for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
			qh_lines (ehci, qh, &next, &size);
	}
	spin_unlock_irqrestore (&ehci->lock, flags);

	return strlen(buf->output_buf);
}

#define DBG_SCHED_LIMIT 64
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	union ehci_shadow	p, *seen;
	unsigned		temp, size, seen_count;
	char			*next;
	unsigned		i;
	__hc32			tag;

	if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
		return 0;
	seen_count = 0;

	hcd = bus_to_hcd(buf->bus);
	ehci = hcd_to_ehci (hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
	size -= temp;
	next += temp;

	/* dump a snapshot of the periodic schedule.
	 * iso changes, interrupt usually doesn't.
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (i = 0; i < ehci->periodic_size; i++) {
		p = ehci->pshadow [i];
		if (likely (!p.ptr))
			continue;
		tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]);

		temp = scnprintf (next, size, "%4d: ", i);
		size -= temp;
		next += temp;

		do {
			struct ehci_qh_hw *hw;

			switch (hc32_to_cpu(ehci, tag)) {
			case Q_TYPE_QH:
				hw = p.qh->hw;
				temp = scnprintf (next, size, " qh%d-%04x/%p",
						p.qh->period,
						hc32_to_cpup(ehci,
							&hw->hw_info2)
							/* uframe masks */
							& (QH_CMASK | QH_SMASK),
						p.qh);
				size -= temp;
				next += temp;
				/* don't repeat what follows this qh */
				for (temp = 0; temp < seen_count; temp++) {
					if (seen [temp].ptr != p.ptr)
						continue;
					if (p.qh->qh_next.ptr) {
						temp = scnprintf (next, size,
							" ...");
						size -= temp;
						next += temp;
					}
					break;
				}
				/* show more info the first time around */
				if (temp == seen_count) {
					u32	scratch = hc32_to_cpup(ehci,
							&hw->hw_info1);
					struct ehci_qtd	*qtd;
					char		*type = "";

					/* count tds, get ep direction */
					temp = 0;
					list_for_each_entry (qtd,
							&p.qh->qtd_list,
							qtd_list) {
						temp++;
						switch (0x03 & (hc32_to_cpu(
							ehci,
							qtd->hw_token) >> 8)) {
						case 0: type = "out"; continue;
						case 1: type = "in"; continue;
						}
					}

					temp = scnprintf (next, size,
						" (%c%d ep%d%s "
						"[%d/%d] q%d p%d)",
						speed_char (scratch),
						scratch & 0x007f,
						(scratch >> 8) & 0x000f, type,
						p.qh->usecs, p.qh->c_usecs,
						temp,
						0x7ff & (scratch >> 16));

					if (seen_count < DBG_SCHED_LIMIT)
						seen [seen_count++].qh = p.qh;
				} else
					temp = 0;
				if (p.qh) {
					tag = Q_NEXT_TYPE(ehci, hw->hw_next);
					p = p.qh->qh_next;
				}
				break;
			case Q_TYPE_FSTN:
				temp = scnprintf (next, size,
					" fstn-%8x/%p", p.fstn->hw_prev,
					p.fstn);
				tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
				p = p.fstn->fstn_next;
				break;
			case Q_TYPE_ITD:
				temp = scnprintf (next, size,
					" itd/%p", p.itd);
				tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
				p = p.itd->itd_next;
				break;
			case Q_TYPE_SITD:
				temp = scnprintf (next, size,
					" sitd%d-%04x/%p",
					p.sitd->stream->interval,
					hc32_to_cpup(ehci, &p.sitd->hw_uframe)
						& 0x0000ffff,
					p.sitd);
				tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
				p = p.sitd->sitd_next;
				break;
			}
			size -= temp;
			next += temp;
		} while (p.ptr);

		temp = scnprintf (next, size, "\n");
		size -= temp;
		next += temp;
	}
	spin_unlock_irqrestore (&ehci->lock, flags);
	kfree (seen);

	return buf->alloc_size - size;
}
#undef DBG_SCHED_LIMIT

static ssize_t fill_registers_buffer(struct debug_buffer *buf)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size, i;
	char			*next, scratch [80];
	static char		fmt [] = "%*s\n";
	static char		label [] = "";

	hcd = bus_to_hcd(buf->bus);
	ehci = hcd_to_ehci (hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	spin_lock_irqsave (&ehci->lock, flags);

	if (!HCD_HW_ACCESSIBLE(hcd)) {
		size = scnprintf (next, size,
			"bus %s, device %s\n"
			"%s\n"
			"SUSPENDED (no register access)\n",
			hcd->self.controller->bus->name,
			dev_name(hcd->self.controller),
			hcd->product_desc);
		goto done;
	}

	/* Capability Registers */
	i = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
	temp = scnprintf (next, size,
		"bus %s, device %s\n"
		"%s\n"
		"EHCI %x.%02x, hcd state %d\n",
		hcd->self.controller->bus->name,
		dev_name(hcd->self.controller),
		hcd->product_desc,
		i >> 8, i & 0x0ff, hcd->state);
	size -= temp;
	next += temp;

#ifdef	CONFIG_PCI
	/* EHCI 0.96 and later may have "extended capabilities" */
	if (hcd->self.controller->bus == &pci_bus_type) {
		struct pci_dev	*pdev;
		u32		offset, cap, cap2;
		unsigned	count = 256/4;

		pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
		offset = HCC_EXT_CAPS(ehci_readl(ehci,
				&ehci->caps->hcc_params));
		while (offset && count--) {
			pci_read_config_dword (pdev, offset, &cap);
			switch (cap & 0xff) {
			case 1:
				temp = scnprintf (next, size,
					"ownership %08x%s%s\n", cap,
					(cap & (1 << 24)) ? " linux" : "",
					(cap & (1 << 16)) ? " firmware" : "");
				size -= temp;
				next += temp;

				offset += 4;
				pci_read_config_dword (pdev, offset, &cap2);
				temp = scnprintf (next, size,
					"SMI sts/enable 0x%08x\n", cap2);
				size -= temp;
				next += temp;
				break;
			case 0:		/* illegal reserved capability */
				cap = 0;
				/* FALLTHROUGH */
			default:		/* unknown */
				break;
			}
			temp = (cap >> 8) & 0xff;
		}
	}
#endif

	// FIXME interpret both types of params
	i = ehci_readl(ehci, &ehci->caps->hcs_params);
	temp = scnprintf (next, size, "structural params 0x%08x\n", i);
	size -= temp;
	next += temp;

	i = ehci_readl(ehci, &ehci->caps->hcc_params);
	temp = scnprintf (next, size, "capability params 0x%08x\n", i);
	size -= temp;
	next += temp;

	/* Operational Registers */
	temp = dbg_status_buf (scratch, sizeof scratch, label,
			ehci_readl(ehci, &ehci->regs->status));
	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_command_buf (scratch, sizeof scratch, label,
			ehci_readl(ehci, &ehci->regs->command));
	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_intr_buf (scratch, sizeof scratch, label,
			ehci_readl(ehci, &ehci->regs->intr_enable));
	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "uframe %04x\n",
			ehci_readl(ehci, &ehci->regs->frame_index));
	size -= temp;
	next += temp;

	for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
		temp = dbg_port_buf (scratch, sizeof scratch, label, i,
				ehci_readl(ehci,
					&ehci->regs->port_status[i - 1]));
		temp = scnprintf (next, size, fmt, temp, scratch);
		size -= temp;
		next += temp;
		if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
			temp = scnprintf (next, size,
					"    debug control %08x\n",
					ehci_readl(ehci,
						&ehci->debug->control));
			size -= temp;
			next += temp;
		}
	}

	if (ehci->reclaim) {
		temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
		size -= temp;
		next += temp;
	}

#ifdef EHCI_STATS
	temp = scnprintf (next, size,
		"irq normal %ld err %ld reclaim %ld (lost %ld)\n",
		ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
		ehci->stats.lost_iaa);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "complete %ld unlink %ld\n",
		ehci->stats.complete, ehci->stats.unlink);
	size -= temp;
	next += temp;
#endif

done:
	spin_unlock_irqrestore (&ehci->lock, flags);

	return buf->alloc_size - size;
}

static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
				ssize_t (*fill_func)(struct debug_buffer *))
{
	struct debug_buffer *buf;

	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);

	if (buf) {
		buf->bus = bus;
		buf->fill_func = fill_func;
		mutex_init(&buf->mutex);
		buf->alloc_size = PAGE_SIZE;
	}

	return buf;
}

static int fill_buffer(struct debug_buffer *buf)
{
	int ret = 0;

	if (!buf->output_buf)
		buf->output_buf = vmalloc(buf->alloc_size);

	if (!buf->output_buf) {
		ret = -ENOMEM;
		goto out;
	}

	ret = buf->fill_func(buf);

	if (ret >= 0) {
		buf->count = ret;
		ret = 0;
	}

out:
	return ret;
}

static ssize_t debug_output(struct file *file, char __user *user_buf,
			    size_t len, loff_t *offset)
{
	struct debug_buffer *buf = file->private_data;
	int ret = 0;

	mutex_lock(&buf->mutex);
	if (buf->count == 0) {
		ret = fill_buffer(buf);
		if (ret != 0) {
			mutex_unlock(&buf->mutex);
			goto out;
		}
	}
	mutex_unlock(&buf->mutex);

	ret = simple_read_from_buffer(user_buf, len, offset,
				      buf->output_buf, buf->count);

out:
	return ret;

}

static int debug_close(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf = file->private_data;

	if (buf) {
		vfree(buf->output_buf);
		kfree(buf);
	}

	return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static int debug_periodic_open(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf;
	buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
	if (!buf)
		return -ENOMEM;

	buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
	file->private_data = buf;
	return 0;
}

static int debug_registers_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private,
					  fill_registers_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static int debug_lpm_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static int debug_lpm_close(struct inode *inode, struct file *file)
{
	return 0;
}

static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos)
{
	/* TODO: show lpm stats */
	return 0;
}

static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	char buf[50];
	size_t len;
	u32 temp;
	unsigned long port;
	u32 __iomem	*portsc ;
	u32 params;

	hcd = bus_to_hcd(file->private_data);
	ehci = hcd_to_ehci(hcd);

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;
	buf[len] = '\0';
	if (len > 0 && buf[len - 1] == '\n')
		buf[len - 1] = '\0';

	if (strncmp(buf, "enable", 5) == 0) {
		if (strict_strtoul(buf + 7, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "LPM: no device attached\n");
			return -ENODEV;
		}
		temp |= PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "force enable LPM for port %lu\n", port);
	} else if (strncmp(buf, "hird=", 5) == 0) {
		unsigned long hird;
		if (strict_strtoul(buf + 5, 16, &hird))
			return -EINVAL;
		printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
		temp = ehci_readl(ehci, &ehci->regs->command);
		temp &= ~CMD_HIRD;
		temp |= hird << 24;
		ehci_writel(ehci, temp, &ehci->regs->command);
	} else if (strncmp(buf, "disable", 7) == 0) {
		if (strict_strtoul(buf + 8, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "ERR: no device attached\n");
			return -ENODEV;
		}
		temp &= ~PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "disabled LPM for port %lu\n", port);
	} else
		return -EOPNOTSUPP;
	return count;
}

static inline void create_debug_files (struct ehci_hcd *ehci)
{
	struct usb_bus *bus = &ehci_to_hcd(ehci)->self;

	ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
	if (!ehci->debug_dir)
		return;

	if (!debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
						&debug_async_fops))
		goto file_error;

	if (!debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
						&debug_periodic_fops))
		goto file_error;

	if (!debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
						    &debug_registers_fops))
		goto file_error;

	if (!debugfs_create_file("lpm", S_IRUGO|S_IWUSR, ehci->debug_dir, bus,
						    &debug_lpm_fops))
		goto file_error;

	return;

file_error:
	debugfs_remove_recursive(ehci->debug_dir);
}

static inline void remove_debug_files (struct ehci_hcd *ehci)
{
	debugfs_remove_recursive(ehci->debug_dir);
}

#endif /* STUB_DEBUG_FILES */