summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci.h
blob: f34a0516d35ff2b63ae0355080db4016b91343a8 (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
/*
 * 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 */

/* statistics can be kept for for tuning/monitoring */
struct ehci_stats {
	/* irq usage */
	unsigned long		normal;
	unsigned long		error;
	unsigned long		reclaim;
	unsigned long		lost_iaa;

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

/* ehci_hcd->lock guards shared data against other CPUs:
 *   ehci_hcd:	async, reclaim, 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 */

struct ehci_hcd {			/* one per controller */
	/* 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;

	/* async schedule support */
	struct ehci_qh		*async;
	struct ehci_qh		*reclaim;
	unsigned		reclaim_ready : 1;
	unsigned		scanning : 1;

	/* periodic schedule support */
#define	DEFAULT_I_TDPS		1024		/* some HCs can do less */
	unsigned		periodic_size;
	__le32			*periodic;	/* hw periodic table */
	dma_addr_t		periodic_dma;
	unsigned		i_thresh;	/* uframes HC might cache */

	union ehci_shadow	*pshadow;	/* mirror hw periodic table */
	int			next_uframe;	/* scan periodic, start here */
	unsigned		periodic_sched;	/* periodic activity count */

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

	/* 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 */

	struct timer_list	watchdog;
	struct notifier_block	reboot_notifier;
	unsigned long		actions;
	unsigned		stamp;
	unsigned long		next_statechange;
	u32			command;

	unsigned		is_tdi_rh_tt:1;	/* TDI roothub with TT */

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

/* 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);
}


enum ehci_timer_action {
	TIMER_IO_WATCHDOG,
	TIMER_IAA_WATCHDOG,
	TIMER_ASYNC_SHRINK,
	TIMER_ASYNC_OFF,
};

static inline void
timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
{
	clear_bit (action, &ehci->actions);
}

static inline void
timer_action (struct ehci_hcd *ehci, enum ehci_timer_action action)
{
	if (!test_and_set_bit (action, &ehci->actions)) {
		unsigned long t;

		switch (action) {
		case TIMER_IAA_WATCHDOG:
			t = EHCI_IAA_JIFFIES;
			break;
		case TIMER_IO_WATCHDOG:
			t = EHCI_IO_JIFFIES;
			break;
		case TIMER_ASYNC_OFF:
			t = EHCI_ASYNC_JIFFIES;
			break;
		// case TIMER_ASYNC_SHRINK:
		default:
			t = EHCI_SHRINK_JIFFIES;
			break;
		}
		t += jiffies;
		// all timings except IAA watchdog can be overridden.
		// async queue SHRINK often precedes IAA.  while it's ready
		// to go OFF neither can matter, and afterwards the IO
		// watchdog stops unless there's still periodic traffic.
		if (action != TIMER_IAA_WATCHDOG
				&& t > ehci->watchdog.expires
				&& timer_pending (&ehci->watchdog))
			return;
		mod_timer (&ehci->watchdog, t);
	}
}

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

/* EHCI register interface, corresponds to EHCI Revision 0.95 specification */

/* Section 2.2 Host Controller Capability Registers */
struct ehci_caps {
	/* these fields are specified as 8 and 16 bit registers,
	 * but some hosts can't perform 8 or 16 bit PCI accesses.
	 */
	u32		hc_capbase;
#define HC_LENGTH(p)		(((p)>>00)&0x00ff)	/* bits 7:0 */
#define HC_VERSION(p)		(((p)>>16)&0xffff)	/* bits 31:16 */
	u32		hcs_params;     /* HCSPARAMS - offset 0x4 */
#define HCS_DEBUG_PORT(p)	(((p)>>20)&0xf)	/* bits 23:20, debug port? */
#define HCS_INDICATOR(p)	((p)&(1 << 16))	/* true: has port indicators */
#define HCS_N_CC(p)		(((p)>>12)&0xf)	/* bits 15:12, #companion HCs */
#define HCS_N_PCC(p)		(((p)>>8)&0xf)	/* bits 11:8, ports per CC */
#define HCS_PORTROUTED(p)	((p)&(1 << 7))	/* true: port routing */ 
#define HCS_PPC(p)		((p)&(1 << 4))	/* true: port power control */ 
#define HCS_N_PORTS(p)		(((p)>>0)&0xf)	/* bits 3:0, ports on HC */

	u32		hcc_params;      /* HCCPARAMS - offset 0x8 */
#define HCC_EXT_CAPS(p)		(((p)>>8)&0xff)	/* for pci extended caps */
#define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */
#define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */
#define HCC_CANPARK(p)		((p)&(1 << 2))  /* true: can park on async qh */
#define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1))  /* true: periodic_size changes*/
#define HCC_64BIT_ADDR(p)       ((p)&(1))       /* true: can use 64-bit addr */
	u8		portroute [8];	 /* nibbles for routing - offset 0xC */
} __attribute__ ((packed));


/* Section 2.3 Host Controller Operational Registers */
struct ehci_regs {

	/* USBCMD: offset 0x00 */
	u32		command;
/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
#define CMD_PARK	(1<<11)		/* enable "park" on async qh */
#define CMD_PARK_CNT(c)	(((c)>>8)&3)	/* how many transfers to park for */
#define CMD_LRESET	(1<<7)		/* partial reset (no ports, etc) */
#define CMD_IAAD	(1<<6)		/* "doorbell" interrupt async advance */
#define CMD_ASE		(1<<5)		/* async schedule enable */
#define CMD_PSE  	(1<<4)		/* periodic schedule enable */
/* 3:2 is periodic frame list size */
#define CMD_RESET	(1<<1)		/* reset HC not bus */
#define CMD_RUN		(1<<0)		/* start/stop HC */

	/* USBSTS: offset 0x04 */
	u32		status;
#define STS_ASS		(1<<15)		/* Async Schedule Status */
#define STS_PSS		(1<<14)		/* Periodic Schedule Status */
#define STS_RECL	(1<<13)		/* Reclamation */
#define STS_HALT	(1<<12)		/* Not running (any reason) */
/* some bits reserved */
	/* these STS_* flags are also intr_enable bits (USBINTR) */
#define STS_IAA		(1<<5)		/* Interrupted on async advance */
#define STS_FATAL	(1<<4)		/* such as some PCI access errors */
#define STS_FLR		(1<<3)		/* frame list rolled over */
#define STS_PCD		(1<<2)		/* port change detect */
#define STS_ERR		(1<<1)		/* "error" completion (overflow, ...) */
#define STS_INT		(1<<0)		/* "normal" completion (short, ...) */

	/* USBINTR: offset 0x08 */
	u32		intr_enable;

	/* FRINDEX: offset 0x0C */
	u32		frame_index;	/* current microframe number */
	/* CTRLDSSEGMENT: offset 0x10 */
	u32		segment; 	/* address bits 63:32 if needed */
	/* PERIODICLISTBASE: offset 0x14 */
	u32		frame_list; 	/* points to periodic list */
	/* ASYNCLISTADDR: offset 0x18 */
	u32		async_next;	/* address of next async queue head */

	u32		reserved [9];

	/* CONFIGFLAG: offset 0x40 */
	u32		configured_flag;
#define FLAG_CF		(1<<0)		/* true: we'll support "high speed" */

	/* PORTSC: offset 0x44 */
	u32		port_status [0];	/* up to N_PORTS */
/* 31:23 reserved */
#define PORT_WKOC_E	(1<<22)		/* wake on overcurrent (enable) */
#define PORT_WKDISC_E	(1<<21)		/* wake on disconnect (enable) */
#define PORT_WKCONN_E	(1<<20)		/* wake on connect (enable) */
/* 19:16 for port testing */
#define PORT_LED_OFF	(0<<14)
#define PORT_LED_AMBER	(1<<14)
#define PORT_LED_GREEN	(2<<14)
#define PORT_LED_MASK	(3<<14)
#define PORT_OWNER	(1<<13)		/* true: companion hc owns this port */
#define PORT_POWER	(1<<12)		/* true: has power (see PPC) */
#define PORT_USB11(x) (((x)&(3<<10))==(1<<10))	/* USB 1.1 device */
/* 11:10 for detecting lowspeed devices (reset vs release ownership) */
/* 9 reserved */
#define PORT_RESET	(1<<8)		/* reset port */
#define PORT_SUSPEND	(1<<7)		/* suspend port */
#define PORT_RESUME	(1<<6)		/* resume it */
#define PORT_OCC	(1<<5)		/* over current change */
#define PORT_OC		(1<<4)		/* over current active */
#define PORT_PEC	(1<<3)		/* port enable change */
#define PORT_PE		(1<<2)		/* port enable */
#define PORT_CSC	(1<<1)		/* connect status change */
#define PORT_CONNECT	(1<<0)		/* device connected */
#define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_OCC)
} __attribute__ ((packed));

/* Appendix C, Debug port ... intended for use with special "debug devices"
 * that can help if there's no serial console.  (nonstandard enumeration.)
 */
struct ehci_dbg_port {
	u32	control;
#define DBGP_OWNER	(1<<30)
#define DBGP_ENABLED	(1<<28)
#define DBGP_DONE	(1<<16)
#define DBGP_INUSE	(1<<10)
#define DBGP_ERRCODE(x)	(((x)>>7)&0x07)
#	define DBGP_ERR_BAD	1
#	define DBGP_ERR_SIGNAL	2
#define DBGP_ERROR	(1<<6)
#define DBGP_GO		(1<<5)
#define DBGP_OUT	(1<<4)
#define DBGP_LEN(x)	(((x)>>0)&0x0f)
	u32	pids;
#define DBGP_PID_GET(x)		(((x)>>16)&0xff)
#define DBGP_PID_SET(data,tok)	(((data)<<8)|(tok))
	u32	data03;
	u32	data47;
	u32	address;
#define DBGP_EPADDR(dev,ep)	(((dev)<<8)|(ep))
} __attribute__ ((packed));

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

#define	QTD_NEXT(dma)	cpu_to_le32((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 */
	__le32			hw_next;	  /* see EHCI 3.5.1 */
	__le32			hw_alt_next;      /* see EHCI 3.5.2 */
	__le32			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? */
	__le32			hw_buf [5];        /* see EHCI 3.5.4 */
	__le32			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 __constant_cpu_to_le32 (~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(dma) ((dma) & __constant_cpu_to_le32 (3 << 1))

/* values for that type tag */
#define Q_TYPE_ITD	__constant_cpu_to_le32 (0 << 1)
#define Q_TYPE_QH	__constant_cpu_to_le32 (1 << 1)
#define Q_TYPE_SITD 	__constant_cpu_to_le32 (2 << 1)
#define Q_TYPE_FSTN 	__constant_cpu_to_le32 (3 << 1)

/* next async queue entry, or pointer to interrupt/periodic QH */
#define	QH_NEXT(dma)	(cpu_to_le32(((u32)dma)&~0x01f)|Q_TYPE_QH)

/* for periodic/async schedules and qtd lists, mark end of list */
#define	EHCI_LIST_END	__constant_cpu_to_le32(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 */
	__le32			*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.
 */

struct ehci_qh {
	/* first part defined by EHCI spec */
	__le32			hw_next;	 /* see EHCI 3.6.1 */
	__le32			hw_info1;        /* see EHCI 3.6.2 */
#define	QH_HEAD		0x00008000
	__le32			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
	__le32			hw_current;	 /* qtd list - see EHCI 3.6.4 */
	
	/* qtd overlay (hardware parts of a struct ehci_qtd) */
	__le32			hw_qtd_next;
	__le32			hw_alt_next;
	__le32			hw_token;
	__le32			hw_buf [5];
	__le32			hw_buf_hi [5];

	/* 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 ehci_qtd		*dummy;
	struct ehci_qh		*reclaim;	/* next to reclaim */

	struct ehci_hcd		*ehci;
	struct kref		kref;
	unsigned		stamp;

	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 reclaim q */
#define	QH_STATE_COMPLETING	5		/* don't touch token.HALT */

	/* periodic schedule info */
	u8			usecs;		/* intr bandwidth */
	u8			gap_uf;		/* uframes split/csplit gap */
	u8			c_usecs;	/* ... split completion bw */
	u16			tt_usecs;	/* tt downstream bandwidth */
	unsigned short		period;		/* polling interval */
	unsigned short		start;		/* where polling starts */
#define NO_FRAME ((unsigned short)~0)			/* pick new start */
	struct usb_device	*dev;		/* access to TT */
} __attribute__ ((aligned (32)));

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

/* 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] |= */
	__le32			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;
	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 two fields match QH, but info1 == 0 */
	__le32			hw_next;
	__le32			hw_info1;

	u32			refcount;
	u8			bEndpointAddress;
	u8			highspeed;
	u16			depth;		/* depth in uframes */
	struct list_head	td_list;	/* queued itds/sitds */
	struct list_head	free_list;	/* list of unused itds/sitds */
	struct usb_device	*udev;
 	struct usb_host_endpoint *ep;

	/* output of (re)scheduling */
	unsigned long		start;		/* jiffies */
	unsigned long		rescheduled;
	int			next_uframe;
	__le32			splits;

	/* the rest is derived from the endpoint descriptor,
	 * trusting urb->interval == f(epdesc->bInterval) and
	 * including the extra info for hw_bufp[0..2]
	 */
	u8			interval;
	u8			usecs, c_usecs;
	u16			tt_usecs;
	u16			maxp;
	u16			raw_mask;
	unsigned		bandwidth;

	/* This is used to initialize iTD's hw_bufp fields */
	__le32			buf0;		
	__le32			buf1;		
	__le32			buf2;

	/* this is used to initialize sITD's tt info */
	__le32			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 */
	__le32			hw_next;           /* see EHCI 3.3.1 */
	__le32			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	__constant_cpu_to_le32(EHCI_ISOC_ACTIVE)

	__le32			hw_bufp [7];	/* see EHCI 3.3.3 */ 
	__le32			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 */
	u8			usecs[8];
} __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 */
	__le32			hw_next;
/* uses bit field macros above - see EHCI 0.95 Table 3-8 */
	__le32			hw_fullspeed_ep;	/* EHCI table 3-9 */
	__le32			hw_uframe;		/* EHCI table 3-10 */
	__le32			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	__constant_cpu_to_le32(SITD_STS_ACTIVE)

	__le32			hw_buf [2];		/* EHCI table 3-12 */
	__le32			hw_backpointer;		/* EHCI table 3-13 */
	__le32			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 {
	__le32			hw_next;	/* any periodic q entry */
	__le32			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)));

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

#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)			((e)->is_tdi_rh_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>>26)&3) {
		case 0:
			return 0;
		case 1:
			return (1<<USB_PORT_FEAT_LOWSPEED);
		case 2:
		default:
			return (1<<USB_PORT_FEAT_HIGHSPEED);
		}
	}
	return (1<<USB_PORT_FEAT_HIGHSPEED);
}

#else

#define	ehci_is_TDI(e)			(0)

#define	ehci_port_speed(ehci, portsc)	(1<<USB_PORT_FEAT_HIGHSPEED)
#endif

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

#ifndef DEBUG
#define STUB_DEBUG_FILES
#endif	/* DEBUG */

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

#endif /* __LINUX_EHCI_HCD_H */