summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci.h
blob: 12504fbded56d95ee4aa996c7a55dd6030cc008a (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
/*
 * 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.
 */

#ifndef __LINUX_EHCI_HCD_H
#define __LINUX_EHCI_HCD_H

/* definitions used for the EHCI driver */

/*
 * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
 * __leXX (normally) or __beXX (given EHCI_BIG_ENDIAN_DESC), depending on
 * the host controller implementation.
 *
 * To facilitate the strongest possible byte-order checking from "sparse"
 * and so on, we use __leXX unless that's not practical.
 */
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
typedef __u32 __bitwise __hc32;
typedef __u16 __bitwise __hc16;
#else
#define __hc32	__le32
#define __hc16	__le16
#endif

/* statistics can be kept for tuning/monitoring */
#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
#define EHCI_STATS
#endif

struct ehci_stats {
	/* irq usage */
	unsigned long		normal;
	unsigned long		error;
	unsigned long		iaa;
	unsigned long		lost_iaa;

	/* termination of urbs from core */
	unsigned long		complete;
	unsigned long		unlink;
};

/*
 * Scheduling and budgeting information for periodic transfers, for both
 * high-speed devices and full/low-speed devices lying behind a TT.
 */
struct ehci_per_sched {
	struct usb_device	*udev;		/* access to the TT */
	struct usb_host_endpoint *ep;
	u16			tt_usecs;	/* time on the FS/LS bus */
	u16			cs_mask;	/* C-mask and S-mask bytes */
	u16			period;		/* actual period in frames */
	u16			phase;		/* actual phase, frame part */
	u8			bw_phase;	/* same, for bandwidth
						   reservation */
	u8			phase_uf;	/* uframe part of the phase */
	u8			usecs, c_usecs;	/* times on the HS bus */
	u8			bw_uperiod;	/* period in microframes, for
						   bandwidth reservation */
	u8			bw_period;	/* same, in frames */
};
#define NO_FRAME	29999			/* frame not assigned yet */

/* ehci_hcd->lock guards shared data against other CPUs:
 *   ehci_hcd:	async, unlink, periodic (and shadow), ...
 *   usb_host_endpoint: hcpriv
 *   ehci_qh:	qh_next, qtd_list
 *   ehci_qtd:	qtd_list
 *
 * Also, hold this lock when talking to HC registers or
 * when updating hw_* fields in shared qh/qtd/... structures.
 */

#define	EHCI_MAX_ROOT_PORTS	15		/* see HCS_N_PORTS */

/*
 * ehci_rh_state values of EHCI_RH_RUNNING or above mean that the
 * controller may be doing DMA.  Lower values mean there's no DMA.
 */
enum ehci_rh_state {
	EHCI_RH_HALTED,
	EHCI_RH_SUSPENDED,
	EHCI_RH_RUNNING,
	EHCI_RH_STOPPING
};

/*
 * Timer events, ordered by increasing delay length.
 * Always update event_delays_ns[] and event_handlers[] (defined in
 * ehci-timer.c) in parallel with this list.
 */
enum ehci_hrtimer_event {
	EHCI_HRTIMER_POLL_ASS,		/* Poll for async schedule off */
	EHCI_HRTIMER_POLL_PSS,		/* Poll for periodic schedule off */
	EHCI_HRTIMER_POLL_DEAD,		/* Wait for dead controller to stop */
	EHCI_HRTIMER_UNLINK_INTR,	/* Wait for interrupt QH unlink */
	EHCI_HRTIMER_FREE_ITDS,		/* Wait for unused iTDs and siTDs */
	EHCI_HRTIMER_START_UNLINK_INTR, /* Unlink empty interrupt QHs */
	EHCI_HRTIMER_ASYNC_UNLINKS,	/* Unlink empty async QHs */
	EHCI_HRTIMER_IAA_WATCHDOG,	/* Handle lost IAA interrupts */
	EHCI_HRTIMER_DISABLE_PERIODIC,	/* Wait to disable periodic sched */
	EHCI_HRTIMER_DISABLE_ASYNC,	/* Wait to disable async sched */
	EHCI_HRTIMER_IO_WATCHDOG,	/* Check for missing IRQs */
	EHCI_HRTIMER_NUM_EVENTS		/* Must come last */
};
#define EHCI_HRTIMER_NO_EVENT	99

struct ehci_hcd {			/* one per controller */
	/* timing support */
	enum ehci_hrtimer_event	next_hrtimer_event;
	unsigned		enabled_hrtimer_events;
	ktime_t			hr_timeouts[EHCI_HRTIMER_NUM_EVENTS];
	struct hrtimer		hrtimer;

	int			PSS_poll_count;
	int			ASS_poll_count;
	int			died_poll_count;

	/* glue to PCI and HCD framework */
	struct ehci_caps __iomem *caps;
	struct ehci_regs __iomem *regs;
	struct ehci_dbg_port __iomem *debug;

	__u32			hcs_params;	/* cached register copy */
	spinlock_t		lock;
	enum ehci_rh_state	rh_state;

	/* general schedule support */
	bool			scanning:1;
	bool			need_rescan:1;
	bool			intr_unlinking:1;
	bool			iaa_in_progress:1;
	bool			async_unlinking:1;
	bool			shutdown:1;
	struct ehci_qh		*qh_scan_next;

	/* async schedule support */
	struct ehci_qh		*async;
	struct ehci_qh		*dummy;		/* For AMD quirk use */
	struct list_head	async_unlink;
	struct list_head	async_idle;
	unsigned		async_unlink_cycle;
	unsigned		async_count;	/* async activity count */

	/* periodic schedule support */
#define	DEFAULT_I_TDPS		1024		/* some HCs can do less */
	unsigned		periodic_size;
	__hc32			*periodic;	/* hw periodic table */
	dma_addr_t		periodic_dma;
	struct list_head	intr_qh_list;
	unsigned		i_thresh;	/* uframes HC might cache */

	union ehci_shadow	*pshadow;	/* mirror hw periodic table */
	struct list_head	intr_unlink_wait;
	struct list_head	intr_unlink;
	unsigned		intr_unlink_wait_cycle;
	unsigned		intr_unlink_cycle;
	unsigned		now_frame;	/* frame from HC hardware */
	unsigned		last_iso_frame;	/* last frame scanned for iso */
	unsigned		intr_count;	/* intr activity count */
	unsigned		isoc_count;	/* isoc activity count */
	unsigned		periodic_count;	/* periodic activity count */
	unsigned		uframe_periodic_max; /* max periodic time per uframe */


	/* list of itds & sitds completed while now_frame was still active */
	struct list_head	cached_itd_list;
	struct ehci_itd		*last_itd_to_free;
	struct list_head	cached_sitd_list;
	struct ehci_sitd	*last_sitd_to_free;

	/* per root hub port */
	unsigned long		reset_done [EHCI_MAX_ROOT_PORTS];

	/* bit vectors (one bit per port) */
	unsigned long		bus_suspended;		/* which ports were
			already suspended at the start of a bus suspend */
	unsigned long		companion_ports;	/* which ports are
			dedicated to the companion controller */
	unsigned long		owned_ports;		/* which ports are
			owned by the companion during a bus suspend */
	unsigned long		port_c_suspend;		/* which ports have
			the change-suspend feature turned on */
	unsigned long		suspended_ports;	/* which ports are
			suspended */
	unsigned long		resuming_ports;		/* which ports have
			started to resume */

	/* per-HC memory pools (could be per-bus, but ...) */
	struct dma_pool		*qh_pool;	/* qh per active urb */
	struct dma_pool		*qtd_pool;	/* one or more per qh */
	struct dma_pool		*itd_pool;	/* itd per iso urb */
	struct dma_pool		*sitd_pool;	/* sitd per split iso urb */

	unsigned		random_frame;
	unsigned long		next_statechange;
	ktime_t			last_periodic_enable;
	u32			command;

	/* SILICON QUIRKS */
	unsigned		no_selective_suspend:1;
	unsigned		has_fsl_port_bug:1; /* FreeScale */
	unsigned		big_endian_mmio:1;
	unsigned		big_endian_desc:1;
	unsigned		big_endian_capbase:1;
	unsigned		has_amcc_usb23:1;
	unsigned		need_io_watchdog:1;
	unsigned		amd_pll_fix:1;
	unsigned		use_dummy_qh:1;	/* AMD Frame List table quirk*/
	unsigned		has_synopsys_hc_bug:1; /* Synopsys HC */
	unsigned		frame_index_bug:1; /* MosChip (AKA NetMos) */
	unsigned		need_oc_pp_cycle:1; /* MPC834X port power */

	/* required for usb32 quirk */
	#define OHCI_CTRL_HCFS          (3 << 6)
	#define OHCI_USB_OPER           (2 << 6)
	#define OHCI_USB_SUSPEND        (3 << 6)

	#define OHCI_HCCTRL_OFFSET      0x4
	#define OHCI_HCCTRL_LEN         0x4
	__hc32			*ohci_hcctrl_reg;
	unsigned		has_hostpc:1;
	unsigned		has_tdi_phy_lpm:1;
	unsigned		has_ppcd:1; /* support per-port change bits */
	u8			sbrn;		/* packed release number */

	/* irq statistics */
#ifdef EHCI_STATS
	struct ehci_stats	stats;
#	define COUNT(x) do { (x)++; } while (0)
#else
#	define COUNT(x) do {} while (0)
#endif

	/* debug files */
#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
	struct dentry		*debug_dir;
#endif

	/* bandwidth usage */
#define EHCI_BANDWIDTH_SIZE	64
#define EHCI_BANDWIDTH_FRAMES	(EHCI_BANDWIDTH_SIZE >> 3)
	u8			bandwidth[EHCI_BANDWIDTH_SIZE];
						/* us allocated per uframe */

	/* platform-specific data -- must come last */
	unsigned long		priv[0] __aligned(sizeof(s64));
};

/* convert between an HCD pointer and the corresponding EHCI_HCD */
static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
{
	return (struct ehci_hcd *) (hcd->hcd_priv);
}
static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
{
	return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
}

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

#include <linux/usb/ehci_def.h>

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

#define	QTD_NEXT(ehci, dma)	cpu_to_hc32(ehci, (u32)dma)

/*
 * EHCI Specification 0.95 Section 3.5
 * QTD: describe data transfer components (buffer, direction, ...)
 * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 *
 * These are associated only with "QH" (Queue Head) structures,
 * used with control, bulk, and interrupt transfers.
 */
struct ehci_qtd {
	/* first part defined by EHCI spec */
	__hc32			hw_next;	/* see EHCI 3.5.1 */
	__hc32			hw_alt_next;    /* see EHCI 3.5.2 */
	__hc32			hw_token;       /* see EHCI 3.5.3 */
#define	QTD_TOGGLE	(1 << 31)	/* data toggle */
#define	QTD_LENGTH(tok)	(((tok)>>16) & 0x7fff)
#define	QTD_IOC		(1 << 15)	/* interrupt on complete */
#define	QTD_CERR(tok)	(((tok)>>10) & 0x3)
#define	QTD_PID(tok)	(((tok)>>8) & 0x3)
#define	QTD_STS_ACTIVE	(1 << 7)	/* HC may execute this */
#define	QTD_STS_HALT	(1 << 6)	/* halted on error */
#define	QTD_STS_DBE	(1 << 5)	/* data buffer error (in HC) */
#define	QTD_STS_BABBLE	(1 << 4)	/* device was babbling (qtd halted) */
#define	QTD_STS_XACT	(1 << 3)	/* device gave illegal response */
#define	QTD_STS_MMF	(1 << 2)	/* incomplete split transaction */
#define	QTD_STS_STS	(1 << 1)	/* split transaction state */
#define	QTD_STS_PING	(1 << 0)	/* issue PING? */

#define ACTIVE_BIT(ehci)	cpu_to_hc32(ehci, QTD_STS_ACTIVE)
#define HALT_BIT(ehci)		cpu_to_hc32(ehci, QTD_STS_HALT)
#define STATUS_BIT(ehci)	cpu_to_hc32(ehci, QTD_STS_STS)

	__hc32			hw_buf [5];        /* see EHCI 3.5.4 */
	__hc32			hw_buf_hi [5];        /* Appendix B */

	/* the rest is HCD-private */
	dma_addr_t		qtd_dma;		/* qtd address */
	struct list_head	qtd_list;		/* sw qtd list */
	struct urb		*urb;			/* qtd's urb */
	size_t			length;			/* length of buffer */
} __attribute__ ((aligned (32)));

/* mask NakCnt+T in qh->hw_alt_next */
#define QTD_MASK(ehci)	cpu_to_hc32 (ehci, ~0x1f)

#define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)

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

/* type tag from {qh,itd,sitd,fstn}->hw_next */
#define Q_NEXT_TYPE(ehci,dma)	((dma) & cpu_to_hc32(ehci, 3 << 1))

/*
 * Now the following defines are not converted using the
 * cpu_to_le32() macro anymore, since we have to support
 * "dynamic" switching between be and le support, so that the driver
 * can be used on one system with SoC EHCI controller using big-endian
 * descriptors as well as a normal little-endian PCI EHCI controller.
 */
/* values for that type tag */
#define Q_TYPE_ITD	(0 << 1)
#define Q_TYPE_QH	(1 << 1)
#define Q_TYPE_SITD	(2 << 1)
#define Q_TYPE_FSTN	(3 << 1)

/* next async queue entry, or pointer to interrupt/periodic QH */
#define QH_NEXT(ehci,dma)	(cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))

/* for periodic/async schedules and qtd lists, mark end of list */
#define EHCI_LIST_END(ehci)	cpu_to_hc32(ehci, 1) /* "null pointer" to hw */

/*
 * Entries in periodic shadow table are pointers to one of four kinds
 * of data structure.  That's dictated by the hardware; a type tag is
 * encoded in the low bits of the hardware's periodic schedule.  Use
 * Q_NEXT_TYPE to get the tag.
 *
 * For entries in the async schedule, the type tag always says "qh".
 */
union ehci_shadow {
	struct ehci_qh		*qh;		/* Q_TYPE_QH */
	struct ehci_itd		*itd;		/* Q_TYPE_ITD */
	struct ehci_sitd	*sitd;		/* Q_TYPE_SITD */
	struct ehci_fstn	*fstn;		/* Q_TYPE_FSTN */
	__hc32			*hw_next;	/* (all types) */
	void			*ptr;
};

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

/*
 * EHCI Specification 0.95 Section 3.6
 * QH: describes control/bulk/interrupt endpoints
 * See Fig 3-7 "Queue Head Structure Layout".
 *
 * These appear in both the async and (for interrupt) periodic schedules.
 */

/* first part defined by EHCI spec */
struct ehci_qh_hw {
	__hc32			hw_next;	/* see EHCI 3.6.1 */
	__hc32			hw_info1;       /* see EHCI 3.6.2 */
#define	QH_CONTROL_EP	(1 << 27)	/* FS/LS control endpoint */
#define	QH_HEAD		(1 << 15)	/* Head of async reclamation list */
#define	QH_TOGGLE_CTL	(1 << 14)	/* Data toggle control */
#define	QH_HIGH_SPEED	(2 << 12)	/* Endpoint speed */
#define	QH_LOW_SPEED	(1 << 12)
#define	QH_FULL_SPEED	(0 << 12)
#define	QH_INACTIVATE	(1 << 7)	/* Inactivate on next transaction */
	__hc32			hw_info2;        /* see EHCI 3.6.2 */
#define	QH_SMASK	0x000000ff
#define	QH_CMASK	0x0000ff00
#define	QH_HUBADDR	0x007f0000
#define	QH_HUBPORT	0x3f800000
#define	QH_MULT		0xc0000000
	__hc32			hw_current;	/* qtd list - see EHCI 3.6.4 */

	/* qtd overlay (hardware parts of a struct ehci_qtd) */
	__hc32			hw_qtd_next;
	__hc32			hw_alt_next;
	__hc32			hw_token;
	__hc32			hw_buf [5];
	__hc32			hw_buf_hi [5];
} __attribute__ ((aligned(32)));

struct ehci_qh {
	struct ehci_qh_hw	*hw;		/* Must come first */
	/* the rest is HCD-private */
	dma_addr_t		qh_dma;		/* address of qh */
	union ehci_shadow	qh_next;	/* ptr to qh; or periodic */
	struct list_head	qtd_list;	/* sw qtd list */
	struct list_head	intr_node;	/* list of intr QHs */
	struct ehci_qtd		*dummy;
	struct list_head	unlink_node;
	struct ehci_per_sched	ps;		/* scheduling info */

	unsigned		unlink_cycle;

	u8			qh_state;
#define	QH_STATE_LINKED		1		/* HC sees this */
#define	QH_STATE_UNLINK		2		/* HC may still see this */
#define	QH_STATE_IDLE		3		/* HC doesn't see this */
#define	QH_STATE_UNLINK_WAIT	4		/* LINKED and on unlink q */
#define	QH_STATE_COMPLETING	5		/* don't touch token.HALT */

	u8			xacterrs;	/* XactErr retry counter */
#define	QH_XACTERR_MAX		32		/* XactErr retry limit */

	u8			gap_uf;		/* uframes split/csplit gap */

	unsigned		is_out:1;	/* bulk or intr OUT */
	unsigned		clearing_tt:1;	/* Clear-TT-Buf in progress */
	unsigned		dequeue_during_giveback:1;
	unsigned		exception:1;	/* got a fault, or an unlink
						   was requested */
};

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

/* description of one iso transaction (up to 3 KB data if highspeed) */
struct ehci_iso_packet {
	/* These will be copied to iTD when scheduling */
	u64			bufp;		/* itd->hw_bufp{,_hi}[pg] |= */
	__hc32			transaction;	/* itd->hw_transaction[i] |= */
	u8			cross;		/* buf crosses pages */
	/* for full speed OUT splits */
	u32			buf1;
};

/* temporary schedule data for packets from iso urbs (both speeds)
 * each packet is one logical usb transaction to the device (not TT),
 * beginning at stream->next_uframe
 */
struct ehci_iso_sched {
	struct list_head	td_list;
	unsigned		span;
	unsigned		first_packet;
	struct ehci_iso_packet	packet [0];
};

/*
 * ehci_iso_stream - groups all (s)itds for this endpoint.
 * acts like a qh would, if EHCI had them for ISO.
 */
struct ehci_iso_stream {
	/* first field matches ehci_hq, but is NULL */
	struct ehci_qh_hw	*hw;

	u8			bEndpointAddress;
	u8			highspeed;
	struct list_head	td_list;	/* queued itds/sitds */
	struct list_head	free_list;	/* list of unused itds/sitds */

	/* output of (re)scheduling */
	struct ehci_per_sched	ps;		/* scheduling info */
	unsigned		next_uframe;
	__hc32			splits;

	/* the rest is derived from the endpoint descriptor,
	 * including the extra info for hw_bufp[0..2]
	 */
	u16			uperiod;	/* period in uframes */
	u16			maxp;
	unsigned		bandwidth;

	/* This is used to initialize iTD's hw_bufp fields */
	__hc32			buf0;
	__hc32			buf1;
	__hc32			buf2;

	/* this is used to initialize sITD's tt info */
	__hc32			address;
};

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

/*
 * EHCI Specification 0.95 Section 3.3
 * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 *
 * Schedule records for high speed iso xfers
 */
struct ehci_itd {
	/* first part defined by EHCI spec */
	__hc32			hw_next;           /* see EHCI 3.3.1 */
	__hc32			hw_transaction [8]; /* see EHCI 3.3.2 */
#define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
#define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
#define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
#define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
#define	EHCI_ITD_LENGTH(tok)	(((tok)>>16) & 0x0fff)
#define	EHCI_ITD_IOC		(1 << 15)	/* interrupt on complete */

#define ITD_ACTIVE(ehci)	cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)

	__hc32			hw_bufp [7];	/* see EHCI 3.3.3 */
	__hc32			hw_bufp_hi [7];	/* Appendix B */

	/* the rest is HCD-private */
	dma_addr_t		itd_dma;	/* for this itd */
	union ehci_shadow	itd_next;	/* ptr to periodic q entry */

	struct urb		*urb;
	struct ehci_iso_stream	*stream;	/* endpoint's queue */
	struct list_head	itd_list;	/* list of stream's itds */

	/* any/all hw_transactions here may be used by that urb */
	unsigned		frame;		/* where scheduled */
	unsigned		pg;
	unsigned		index[8];	/* in urb->iso_frame_desc */
} __attribute__ ((aligned (32)));

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

/*
 * EHCI Specification 0.95 Section 3.4
 * siTD, aka split-transaction isochronous Transfer Descriptor
 *       ... describe full speed iso xfers through TT in hubs
 * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 */
struct ehci_sitd {
	/* first part defined by EHCI spec */
	__hc32			hw_next;
/* uses bit field macros above - see EHCI 0.95 Table 3-8 */
	__hc32			hw_fullspeed_ep;	/* EHCI table 3-9 */
	__hc32			hw_uframe;		/* EHCI table 3-10 */
	__hc32			hw_results;		/* EHCI table 3-11 */
#define	SITD_IOC	(1 << 31)	/* interrupt on completion */
#define	SITD_PAGE	(1 << 30)	/* buffer 0/1 */
#define	SITD_LENGTH(x)	(0x3ff & ((x)>>16))
#define	SITD_STS_ACTIVE	(1 << 7)	/* HC may execute this */
#define	SITD_STS_ERR	(1 << 6)	/* error from TT */
#define	SITD_STS_DBE	(1 << 5)	/* data buffer error (in HC) */
#define	SITD_STS_BABBLE	(1 << 4)	/* device was babbling */
#define	SITD_STS_XACT	(1 << 3)	/* illegal IN response */
#define	SITD_STS_MMF	(1 << 2)	/* incomplete split transaction */
#define	SITD_STS_STS	(1 << 1)	/* split transaction state */

#define SITD_ACTIVE(ehci)	cpu_to_hc32(ehci, SITD_STS_ACTIVE)

	__hc32			hw_buf [2];		/* EHCI table 3-12 */
	__hc32			hw_backpointer;		/* EHCI table 3-13 */
	__hc32			hw_buf_hi [2];		/* Appendix B */

	/* the rest is HCD-private */
	dma_addr_t		sitd_dma;
	union ehci_shadow	sitd_next;	/* ptr to periodic q entry */

	struct urb		*urb;
	struct ehci_iso_stream	*stream;	/* endpoint's queue */
	struct list_head	sitd_list;	/* list of stream's sitds */
	unsigned		frame;
	unsigned		index;
} __attribute__ ((aligned (32)));

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

/*
 * EHCI Specification 0.96 Section 3.7
 * Periodic Frame Span Traversal Node (FSTN)
 *
 * Manages split interrupt transactions (using TT) that span frame boundaries
 * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 */
struct ehci_fstn {
	__hc32			hw_next;	/* any periodic q entry */
	__hc32			hw_prev;	/* qh or EHCI_LIST_END */

	/* the rest is HCD-private */
	dma_addr_t		fstn_dma;
	union ehci_shadow	fstn_next;	/* ptr to periodic q entry */
} __attribute__ ((aligned (32)));

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

/* Prepare the PORTSC wakeup flags during controller suspend/resume */

#define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup)	\
		ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup);

#define ehci_prepare_ports_for_controller_resume(ehci)			\
		ehci_adjust_port_wakeup_flags(ehci, false, false);

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

#ifdef CONFIG_USB_EHCI_ROOT_HUB_TT

/*
 * Some EHCI controllers have a Transaction Translator built into the
 * root hub. This is a non-standard feature.  Each controller will need
 * to add code to the following inline functions, and call them as
 * needed (mostly in root hub code).
 */

#define	ehci_is_TDI(e)			(ehci_to_hcd(e)->has_tt)

/* Returns the speed of a device attached to a port on the root hub. */
static inline unsigned int
ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
{
	if (ehci_is_TDI(ehci)) {
		switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
		case 0:
			return 0;
		case 1:
			return USB_PORT_STAT_LOW_SPEED;
		case 2:
		default:
			return USB_PORT_STAT_HIGH_SPEED;
		}
	}
	return USB_PORT_STAT_HIGH_SPEED;
}

#else

#define	ehci_is_TDI(e)			(0)

#define	ehci_port_speed(ehci, portsc)	USB_PORT_STAT_HIGH_SPEED
#endif

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

#ifdef CONFIG_PPC_83xx
/* Some Freescale processors have an erratum in which the TT
 * port number in the queue head was 0..N-1 instead of 1..N.
 */
#define	ehci_has_fsl_portno_bug(e)		((e)->has_fsl_port_bug)
#else
#define	ehci_has_fsl_portno_bug(e)		(0)
#endif

/*
 * While most USB host controllers implement their registers in
 * little-endian format, a minority (celleb companion chip) implement
 * them in big endian format.
 *
 * This attempts to support either format at compile time without a
 * runtime penalty, or both formats with the additional overhead
 * of checking a flag bit.
 *
 * ehci_big_endian_capbase is a special quirk for controllers that
 * implement the HC capability registers as separate registers and not
 * as fields of a 32-bit register.
 */

#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
#define ehci_big_endian_mmio(e)		((e)->big_endian_mmio)
#define ehci_big_endian_capbase(e)	((e)->big_endian_capbase)
#else
#define ehci_big_endian_mmio(e)		0
#define ehci_big_endian_capbase(e)	0
#endif

/*
 * Big-endian read/write functions are arch-specific.
 * Other arches can be added if/when they're needed.
 */
#if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
#define readl_be(addr)		__raw_readl((__force unsigned *)addr)
#define writel_be(val, addr)	__raw_writel(val, (__force unsigned *)addr)
#endif

static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
		__u32 __iomem * regs)
{
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
	return ehci_big_endian_mmio(ehci) ?
		readl_be(regs) :
		readl(regs);
#else
	return readl(regs);
#endif
}

static inline void ehci_writel(const struct ehci_hcd *ehci,
		const unsigned int val, __u32 __iomem *regs)
{
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
	ehci_big_endian_mmio(ehci) ?
		writel_be(val, regs) :
		writel(val, regs);
#else
	writel(val, regs);
#endif
}

/*
 * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 * Other common bits are dependent on has_amcc_usb23 quirk flag.
 */
#ifdef CONFIG_44x
static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
{
	u32 hc_control;

	hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
	if (operational)
		hc_control |= OHCI_USB_OPER;
	else
		hc_control |= OHCI_USB_SUSPEND;

	writel_be(hc_control, ehci->ohci_hcctrl_reg);
	(void) readl_be(ehci->ohci_hcctrl_reg);
}
#else
static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
{ }
#endif

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

/*
 * The AMCC 440EPx not only implements its EHCI registers in big-endian
 * format, but also its DMA data structures (descriptors).
 *
 * EHCI controllers accessed through PCI work normally (little-endian
 * everywhere), so we won't bother supporting a BE-only mode for now.
 */
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
#define ehci_big_endian_desc(e)		((e)->big_endian_desc)

/* cpu to ehci */
static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
{
	return ehci_big_endian_desc(ehci)
		? (__force __hc32)cpu_to_be32(x)
		: (__force __hc32)cpu_to_le32(x);
}

/* ehci to cpu */
static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
{
	return ehci_big_endian_desc(ehci)
		? be32_to_cpu((__force __be32)x)
		: le32_to_cpu((__force __le32)x);
}

static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
{
	return ehci_big_endian_desc(ehci)
		? be32_to_cpup((__force __be32 *)x)
		: le32_to_cpup((__force __le32 *)x);
}

#else

/* cpu to ehci */
static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
{
	return cpu_to_le32(x);
}

/* ehci to cpu */
static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
{
	return le32_to_cpu(x);
}

static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
{
	return le32_to_cpup(x);
}

#endif

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

#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)


#if !defined(DEBUG) && !defined(CONFIG_DYNAMIC_DEBUG)
#define STUB_DEBUG_FILES
#endif	/* !DEBUG && !CONFIG_DYNAMIC_DEBUG */

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

/* Declarations of things exported for use by ehci platform drivers */

struct ehci_driver_overrides {
	size_t		extra_priv_size;
	int		(*reset)(struct usb_hcd *hcd);
};

extern void	ehci_init_driver(struct hc_driver *drv,
				const struct ehci_driver_overrides *over);
extern int	ehci_setup(struct usb_hcd *hcd);
extern int	ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
				u32 mask, u32 done, int usec);

#ifdef CONFIG_PM
extern int	ehci_suspend(struct usb_hcd *hcd, bool do_wakeup);
extern int	ehci_resume(struct usb_hcd *hcd, bool hibernated);
#endif	/* CONFIG_PM */

#endif /* __LINUX_EHCI_HCD_H */