summaryrefslogtreecommitdiff
path: root/include/usb.h
blob: 9625148b5142584799c3991c60dd977e794b2d5a (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
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * Adapted for U-Boot driver model
 * (C) Copyright 2015 Google, Inc
 *
 * SPDX-License-Identifier:	GPL-2.0+
 * Note: Part of this code has been derived from linux
 *
 */
#ifndef _USB_H_
#define _USB_H_

#include <fdtdec.h>
#include <usb_defs.h>
#include <linux/usb/ch9.h>
#include <asm/cache.h>
#include <part.h>

/*
 * The EHCI spec says that we must align to at least 32 bytes.  However,
 * some platforms require larger alignment.
 */
#if ARCH_DMA_MINALIGN > 32
#define USB_DMA_MINALIGN	ARCH_DMA_MINALIGN
#else
#define USB_DMA_MINALIGN	32
#endif

/* Everything is aribtrary */
#define USB_ALTSETTINGALLOC		4
#define USB_MAXALTSETTING		128	/* Hard limit */

#define USB_MAX_DEVICE			32
#define USB_MAXCONFIG			8
#define USB_MAXINTERFACES		8
#define USB_MAXENDPOINTS		16
#define USB_MAXCHILDREN			8	/* This is arbitrary */
#define USB_MAX_HUB			16

#define USB_CNTL_TIMEOUT 100 /* 100ms timeout */

/*
 * This is the timeout to allow for submitting an urb in ms. We allow more
 * time for a BULK device to react - some are slow.
 */
#define USB_TIMEOUT_MS(pipe) (usb_pipebulk(pipe) ? 5000 : 1000)

/* device request (setup) */
struct devrequest {
	__u8	requesttype;
	__u8	request;
	__le16	value;
	__le16	index;
	__le16	length;
} __attribute__ ((packed));

/* Interface */
struct usb_interface {
	struct usb_interface_descriptor desc;

	__u8	no_of_ep;
	__u8	num_altsetting;
	__u8	act_altsetting;

	struct usb_endpoint_descriptor ep_desc[USB_MAXENDPOINTS];
	/*
	 * Super Speed Device will have Super Speed Endpoint
	 * Companion Descriptor  (section 9.6.7 of usb 3.0 spec)
	 * Revision 1.0 June 6th 2011
	 */
	struct usb_ss_ep_comp_descriptor ss_ep_comp_desc[USB_MAXENDPOINTS];
} __attribute__ ((packed));

/* Configuration information.. */
struct usb_config {
	struct usb_config_descriptor desc;

	__u8	no_of_if;	/* number of interfaces */
	struct usb_interface if_desc[USB_MAXINTERFACES];
} __attribute__ ((packed));

enum {
	/* Maximum packet size; encoded as 0,1,2,3 = 8,16,32,64 */
	PACKET_SIZE_8   = 0,
	PACKET_SIZE_16  = 1,
	PACKET_SIZE_32  = 2,
	PACKET_SIZE_64  = 3,
};

/**
 * struct usb_device - information about a USB device
 *
 * With driver model both UCLASS_USB (the USB controllers) and UCLASS_USB_HUB
 * (the hubs) have this as parent data. Hubs are children of controllers or
 * other hubs and there is always a single root hub for each controller.
 * Therefore struct usb_device can always be accessed with
 * dev_get_parentdata(dev), where dev is a USB device.
 *
 * Pointers exist for obtaining both the device (could be any uclass) and
 * controller (UCLASS_USB) from this structure. The controller does not have
 * a struct usb_device since it is not a device.
 */
struct usb_device {
	int	devnum;			/* Device number on USB bus */
	int	speed;			/* full/low/high */
	char	mf[32];			/* manufacturer */
	char	prod[32];		/* product */
	char	serial[32];		/* serial number */

	/* Maximum packet size; one of: PACKET_SIZE_* */
	int maxpacketsize;
	/* one bit for each endpoint ([0] = IN, [1] = OUT) */
	unsigned int toggle[2];
	/* endpoint halts; one bit per endpoint # & direction;
	 * [0] = IN, [1] = OUT
	 */
	unsigned int halted[2];
	int epmaxpacketin[16];		/* INput endpoint specific maximums */
	int epmaxpacketout[16];		/* OUTput endpoint specific maximums */

	int configno;			/* selected config number */
	/* Device Descriptor */
	struct usb_device_descriptor descriptor
		__attribute__((aligned(ARCH_DMA_MINALIGN)));
	struct usb_config config; /* config descriptor */

	int have_langid;		/* whether string_langid is valid yet */
	int string_langid;		/* language ID for strings */
	int (*irq_handle)(struct usb_device *dev);
	unsigned long irq_status;
	int irq_act_len;		/* transfered bytes */
	void *privptr;
	/*
	 * Child devices -  if this is a hub device
	 * Each instance needs its own set of data structures.
	 */
	unsigned long status;
	unsigned long int_pending;	/* 1 bit per ep, used by int_queue */
	int act_len;			/* transfered bytes */
	int maxchild;			/* Number of ports if hub */
	int portnr;			/* Port number, 1=first */
#ifndef CONFIG_DM_USB
	/* parent hub, or NULL if this is the root hub */
	struct usb_device *parent;
	struct usb_device *children[USB_MAXCHILDREN];
	void *controller;		/* hardware controller private data */
#endif
	/* slot_id - for xHCI enabled devices */
	unsigned int slot_id;
#ifdef CONFIG_DM_USB
	struct udevice *dev;		/* Pointer to associated device */
	struct udevice *controller_dev;	/* Pointer to associated controller */
#endif
};

struct int_queue;

/*
 * You can initialize platform's USB host or device
 * ports by passing this enum as an argument to
 * board_usb_init().
 */
enum usb_init_type {
	USB_INIT_HOST,
	USB_INIT_DEVICE
};

/**********************************************************************
 * this is how the lowlevel part communicate with the outer world
 */

#if defined(CONFIG_USB_UHCI) || defined(CONFIG_USB_OHCI) || \
	defined(CONFIG_USB_EHCI) || defined(CONFIG_USB_OHCI_NEW) || \
	defined(CONFIG_USB_SL811HS) || defined(CONFIG_USB_ISP116X_HCD) || \
	defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \
	defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \
	defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X) || \
	defined(CONFIG_USB_MUSB_DSPS) || defined(CONFIG_USB_MUSB_AM35X) || \
	defined(CONFIG_USB_MUSB_OMAP2PLUS) || defined(CONFIG_USB_MUSB_SUNXI) || \
	defined(CONFIG_USB_XHCI) || defined(CONFIG_USB_DWC2)

int usb_lowlevel_init(int index, enum usb_init_type init, void **controller);
int usb_lowlevel_stop(int index);

#if defined(CONFIG_MUSB_HOST) || defined(CONFIG_DM_USB)
int usb_reset_root_port(void);
#else
#define usb_reset_root_port()
#endif

int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
			void *buffer, int transfer_len);
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
			int transfer_len, struct devrequest *setup);
int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
			int transfer_len, int interval);

#if defined CONFIG_USB_EHCI || defined CONFIG_MUSB_HOST
struct int_queue *create_int_queue(struct usb_device *dev, unsigned long pipe,
	int queuesize, int elementsize, void *buffer, int interval);
int destroy_int_queue(struct usb_device *dev, struct int_queue *queue);
void *poll_int_queue(struct usb_device *dev, struct int_queue *queue);
#endif

/* Defines */
#define USB_UHCI_VEND_ID	0x8086
#define USB_UHCI_DEV_ID		0x7112

/*
 * PXA25x can only act as USB device. There are drivers
 * which works with USB CDC gadgets implementations.
 * Some of them have common routines which can be used
 * in boards init functions e.g. udc_disconnect() used for
 * forced device disconnection from host.
 */
#elif defined(CONFIG_USB_GADGET_PXA2XX)

extern void udc_disconnect(void);

#endif

/*
 * board-specific hardware initialization, called by
 * usb drivers and u-boot commands
 *
 * @param index USB controller number
 * @param init initializes controller as USB host or device
 */
int board_usb_init(int index, enum usb_init_type init);

/*
 * can be used to clean up after failed USB initialization attempt
 * vide: board_usb_init()
 *
 * @param index USB controller number for selective cleanup
 * @param init usb_init_type passed to board_usb_init()
 */
int board_usb_cleanup(int index, enum usb_init_type init);

#ifdef CONFIG_USB_STORAGE

#define USB_MAX_STOR_DEV 5
block_dev_desc_t *usb_stor_get_dev(int index);
int usb_stor_scan(int mode);
int usb_stor_info(void);

#endif

#ifdef CONFIG_USB_HOST_ETHER

#define USB_MAX_ETH_DEV 5
int usb_host_eth_scan(int mode);

#endif

#ifdef CONFIG_USB_KEYBOARD

int drv_usb_kbd_init(void);
int usb_kbd_deregister(int force);

#endif
/* routines */
int usb_init(void); /* initialize the USB Controller */
int usb_stop(void); /* stop the USB Controller */


int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);
int usb_set_idle(struct usb_device *dev, int ifnum, int duration,
			int report_id);
int usb_control_msg(struct usb_device *dev, unsigned int pipe,
			unsigned char request, unsigned char requesttype,
			unsigned short value, unsigned short index,
			void *data, unsigned short size, int timeout);
int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
			void *data, int len, int *actual_length, int timeout);
int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
			void *buffer, int transfer_len, int interval);
int usb_disable_asynch(int disable);
int usb_maxpacket(struct usb_device *dev, unsigned long pipe);
int usb_get_configuration_no(struct usb_device *dev, unsigned char *buffer,
				int cfgno);
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
			unsigned char id, void *buf, int size);
int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
			unsigned char type, unsigned char id, void *buf,
			int size);
int usb_clear_halt(struct usb_device *dev, int pipe);
int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
int usb_set_interface(struct usb_device *dev, int interface, int alternate);

/* big endian -> little endian conversion */
/* some CPUs are already little endian e.g. the ARM920T */
#define __swap_16(x) \
	({ unsigned short x_ = (unsigned short)x; \
	 (unsigned short)( \
		((x_ & 0x00FFU) << 8) | ((x_ & 0xFF00U) >> 8)); \
	})
#define __swap_32(x) \
	({ unsigned long x_ = (unsigned long)x; \
	 (unsigned long)( \
		((x_ & 0x000000FFUL) << 24) | \
		((x_ & 0x0000FF00UL) <<	 8) | \
		((x_ & 0x00FF0000UL) >>	 8) | \
		((x_ & 0xFF000000UL) >> 24)); \
	})

#ifdef __LITTLE_ENDIAN
# define swap_16(x) (x)
# define swap_32(x) (x)
#else
# define swap_16(x) __swap_16(x)
# define swap_32(x) __swap_32(x)
#endif

/*
 * Calling this entity a "pipe" is glorifying it. A USB pipe
 * is something embarrassingly simple: it basically consists
 * of the following information:
 *  - device number (7 bits)
 *  - endpoint number (4 bits)
 *  - current Data0/1 state (1 bit)
 *  - direction (1 bit)
 *  - speed (2 bits)
 *  - max packet size (2 bits: 8, 16, 32 or 64)
 *  - pipe type (2 bits: control, interrupt, bulk, isochronous)
 *
 * That's 18 bits. Really. Nothing more. And the USB people have
 * documented these eighteen bits as some kind of glorious
 * virtual data structure.
 *
 * Let's not fall in that trap. We'll just encode it as a simple
 * unsigned int. The encoding is:
 *
 *  - max size:		bits 0-1	(00 = 8, 01 = 16, 10 = 32, 11 = 64)
 *  - direction:	bit 7		(0 = Host-to-Device [Out],
 *					(1 = Device-to-Host [In])
 *  - device:		bits 8-14
 *  - endpoint:		bits 15-18
 *  - Data0/1:		bit 19
 *  - pipe type:	bits 30-31	(00 = isochronous, 01 = interrupt,
 *					 10 = control, 11 = bulk)
 *
 * Why? Because it's arbitrary, and whatever encoding we select is really
 * up to us. This one happens to share a lot of bit positions with the UHCI
 * specification, so that much of the uhci driver can just mask the bits
 * appropriately.
 */
/* Create various pipes... */
#define create_pipe(dev,endpoint) \
		(((dev)->devnum << 8) | ((endpoint) << 15) | \
		(dev)->maxpacketsize)
#define default_pipe(dev) ((dev)->speed << 26)

#define usb_sndctrlpipe(dev, endpoint)	((PIPE_CONTROL << 30) | \
					 create_pipe(dev, endpoint))
#define usb_rcvctrlpipe(dev, endpoint)	((PIPE_CONTROL << 30) | \
					 create_pipe(dev, endpoint) | \
					 USB_DIR_IN)
#define usb_sndisocpipe(dev, endpoint)	((PIPE_ISOCHRONOUS << 30) | \
					 create_pipe(dev, endpoint))
#define usb_rcvisocpipe(dev, endpoint)	((PIPE_ISOCHRONOUS << 30) | \
					 create_pipe(dev, endpoint) | \
					 USB_DIR_IN)
#define usb_sndbulkpipe(dev, endpoint)	((PIPE_BULK << 30) | \
					 create_pipe(dev, endpoint))
#define usb_rcvbulkpipe(dev, endpoint)	((PIPE_BULK << 30) | \
					 create_pipe(dev, endpoint) | \
					 USB_DIR_IN)
#define usb_sndintpipe(dev, endpoint)	((PIPE_INTERRUPT << 30) | \
					 create_pipe(dev, endpoint))
#define usb_rcvintpipe(dev, endpoint)	((PIPE_INTERRUPT << 30) | \
					 create_pipe(dev, endpoint) | \
					 USB_DIR_IN)
#define usb_snddefctrl(dev)		((PIPE_CONTROL << 30) | \
					 default_pipe(dev))
#define usb_rcvdefctrl(dev)		((PIPE_CONTROL << 30) | \
					 default_pipe(dev) | \
					 USB_DIR_IN)

/* The D0/D1 toggle bits */
#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> ep) & 1)
#define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << ep))
#define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = \
						((dev)->toggle[out] & \
						 ~(1 << ep)) | ((bit) << ep))

/* Endpoint halt control/status */
#define usb_endpoint_out(ep_dir)	(((ep_dir >> 7) & 1) ^ 1)
#define usb_endpoint_halt(dev, ep, out) ((dev)->halted[out] |= (1 << (ep)))
#define usb_endpoint_running(dev, ep, out) ((dev)->halted[out] &= ~(1 << (ep)))
#define usb_endpoint_halted(dev, ep, out) ((dev)->halted[out] & (1 << (ep)))

#define usb_packetid(pipe)	(((pipe) & USB_DIR_IN) ? USB_PID_IN : \
				 USB_PID_OUT)

#define usb_pipeout(pipe)	((((pipe) >> 7) & 1) ^ 1)
#define usb_pipein(pipe)	(((pipe) >> 7) & 1)
#define usb_pipedevice(pipe)	(((pipe) >> 8) & 0x7f)
#define usb_pipe_endpdev(pipe)	(((pipe) >> 8) & 0x7ff)
#define usb_pipeendpoint(pipe)	(((pipe) >> 15) & 0xf)
#define usb_pipedata(pipe)	(((pipe) >> 19) & 1)
#define usb_pipetype(pipe)	(((pipe) >> 30) & 3)
#define usb_pipeisoc(pipe)	(usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
#define usb_pipeint(pipe)	(usb_pipetype((pipe)) == PIPE_INTERRUPT)
#define usb_pipecontrol(pipe)	(usb_pipetype((pipe)) == PIPE_CONTROL)
#define usb_pipebulk(pipe)	(usb_pipetype((pipe)) == PIPE_BULK)

#define usb_pipe_ep_index(pipe)	\
		usb_pipecontrol(pipe) ? (usb_pipeendpoint(pipe) * 2) : \
				((usb_pipeendpoint(pipe) * 2) - \
				 (usb_pipein(pipe) ? 0 : 1))

/*************************************************************************
 * Hub Stuff
 */
struct usb_port_status {
	unsigned short wPortStatus;
	unsigned short wPortChange;
} __attribute__ ((packed));

struct usb_hub_status {
	unsigned short wHubStatus;
	unsigned short wHubChange;
} __attribute__ ((packed));


/* Hub descriptor */
struct usb_hub_descriptor {
	unsigned char  bLength;
	unsigned char  bDescriptorType;
	unsigned char  bNbrPorts;
	unsigned short wHubCharacteristics;
	unsigned char  bPwrOn2PwrGood;
	unsigned char  bHubContrCurrent;
	unsigned char  DeviceRemovable[(USB_MAXCHILDREN+1+7)/8];
	unsigned char  PortPowerCtrlMask[(USB_MAXCHILDREN+1+7)/8];
	/* DeviceRemovable and PortPwrCtrlMask want to be variable-length
	   bitmaps that hold max 255 entries. (bit0 is ignored) */
} __attribute__ ((packed));


struct usb_hub_device {
	struct usb_device *pusb_dev;
	struct usb_hub_descriptor desc;
};

#ifdef CONFIG_DM_USB
/**
 * struct usb_platdata - Platform data about a USB controller
 *
 * Given a USB controller (UCLASS_USB) dev this is dev_get_platdata(dev)
 */
struct usb_platdata {
	enum usb_init_type init_type;
};

/**
 * struct usb_dev_platdata - Platform data about a USB device
 *
 * Given a USB device dev this structure is dev_get_parent_platdata(dev).
 * This is used by sandbox to provide emulation data also.
 *
 * @id:		ID used to match this device
 * @speed:	Stores the speed associated with a USB device
 * @devnum:	Device address on the USB bus
 * @slot_id:	USB3 slot ID, which is separate from the device address
 * @portnr:	Port number of this device on its parent hub, numbered from 1
 *		(0 mean this device is the root hub)
 * @strings:	List of descriptor strings (for sandbox emulation purposes)
 * @desc_list:	List of descriptors (for sandbox emulation purposes)
 */
struct usb_dev_platdata {
	struct usb_device_id id;
	enum usb_device_speed speed;
	int devnum;
	int slot_id;
	int portnr;	/* Hub port number, 1..n */
#ifdef CONFIG_SANDBOX
	struct usb_string *strings;
	/* NULL-terminated list of descriptor pointers */
	struct usb_generic_descriptor **desc_list;
#endif
	int configno;
};

/**
 * struct usb_bus_priv - information about the USB controller
 *
 * Given a USB controller (UCLASS_USB) 'dev', this is
 * dev_get_uclass_priv(dev).
 *
 * @next_addr:	Next device address to allocate minus 1. Incremented by 1
 *		each time a new device address is set, so this holds the
 *		number of devices on the bus
 * @desc_before_addr:	true if we can read a device descriptor before it
 *		has been assigned an address. For XHCI this is not possible
 *		so this will be false.
 */
struct usb_bus_priv {
	int next_addr;
	bool desc_before_addr;
};

/**
 * struct dm_usb_ops - USB controller operations
 *
 * This defines the operations supoorted on a USB controller. Common
 * arguments are:
 *
 * @bus:	USB bus (i.e. controller), which is in UCLASS_USB.
 * @udev:	USB device parent data. Controllers are not expected to need
 *		this, since the device address on the bus is encoded in @pipe.
 *		It is used for sandbox, and can be handy for debugging and
 *		logging.
 * @pipe:	An assortment of bitfields which provide address and packet
 *		type information. See create_pipe() above for encoding
 *		details
 * @buffer:	A buffer to use for sending/receiving. This should be
 *		DMA-aligned.
 * @length:	Buffer length in bytes
 */
struct dm_usb_ops {
	/**
	 * control() - Send a control message
	 *
	 * Most parameters are as above.
	 *
	 * @setup: Additional setup information required by the message
	 */
	int (*control)(struct udevice *bus, struct usb_device *udev,
		       unsigned long pipe, void *buffer, int length,
		       struct devrequest *setup);
	/**
	 * bulk() - Send a bulk message
	 *
	 * Parameters are as above.
	 */
	int (*bulk)(struct udevice *bus, struct usb_device *udev,
		    unsigned long pipe, void *buffer, int length);
	/**
	 * interrupt() - Send an interrupt message
	 *
	 * Most parameters are as above.
	 *
	 * @interval: Interrupt interval
	 */
	int (*interrupt)(struct udevice *bus, struct usb_device *udev,
			 unsigned long pipe, void *buffer, int length,
			 int interval);
	/**
	 * alloc_device() - Allocate a new device context (XHCI)
	 *
	 * Before sending packets to a new device on an XHCI bus, a device
	 * context must be created. If this method is not NULL it will be
	 * called before the device is enumerated (even before its descriptor
	 * is read). This should be NULL for EHCI, which does not need this.
	 */
	int (*alloc_device)(struct udevice *bus, struct usb_device *udev);
};

#define usb_get_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)
#define usb_get_emul_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)

#ifdef CONFIG_MUSB_HOST
int usb_reset_root_port(void);
#endif

/**
 * usb_get_dev_index() - look up a device index number
 *
 * Look up devices using their index number (starting at 0). This works since
 * in U-Boot device addresses are allocated starting at 1 with no gaps.
 *
 * TODO(sjg@chromium.org): Remove this function when usb_ether.c is modified
 * to work better with driver model.
 *
 * @bus:	USB bus to check
 * @index:	Index number of device to find (0=first). This is just the
 *		device address less 1.
 */
struct usb_device *usb_get_dev_index(struct udevice *bus, int index);

/**
 * usb_legacy_port_reset() - Legacy function to reset a hub port
 *
 * @hub:	Hub device
 * @portnr:	Port number (1=first)
 */
int usb_legacy_port_reset(struct usb_device *hub, int portnr);

/**
 * usb_setup_device() - set up a device ready for use
 *
 * @dev:	USB device pointer. This need not be a real device - it is
 *		common for it to just be a local variable with its ->dev
 *		member (i.e. @dev->dev) set to the parent device
 * @do_read:	true to read the device descriptor before an address is set
 *		(should be false for XHCI buses, true otherwise)
 * @parent:	Parent device (either UCLASS_USB or UCLASS_USB_HUB)
 * @portnr:	Port number on hub (1=first) or 0 for none
 * @return 0 if OK, -ve on error */
int usb_setup_device(struct usb_device *dev, bool do_read,
		     struct usb_device *parent, int portnr);

/**
 * usb_hub_scan() - Scan a hub and find its devices
 *
 * @hub:	Hub device to scan
 */
int usb_hub_scan(struct udevice *hub);

/**
 * usb_scan_device() - Scan a device on a bus
 *
 * Scan a device on a bus. It has already been detected and is ready to
 * be enumerated. This may be either the root hub (@parent is a bus) or a
 * normal device (@parent is a hub)
 *
 * @parent:	Parent device
 * @port:	Hub port number (numbered from 1)
 * @speed:	USB speed to use for this device
 * @devp:	Returns pointer to device if all is well
 * @return 0 if OK, -ve on error
 */
int usb_scan_device(struct udevice *parent, int port,
		    enum usb_device_speed speed, struct udevice **devp);

/**
 * usb_get_bus() - Find the bus for a device
 *
 * Search up through parents to find the bus this device is connected to. This
 * will be a device with uclass UCLASS_USB.
 *
 * @dev:	Device to check
 * @busp:	Returns bus, or NULL if not found
 * @return 0 if OK, -EXDEV is somehow this bus does not have a controller (this
 *	indicates a critical error in the USB stack
 */
int usb_get_bus(struct udevice *dev, struct udevice **busp);

/**
 * usb_select_config() - Set up a device ready for use
 *
 * This function assumes that the device already has an address and a driver
 * bound, and is ready to be set up.
 *
 * This re-reads the device and configuration descriptors and sets the
 * configuration
 *
 * @dev:	Device to set up
 */
int usb_select_config(struct usb_device *dev);

/**
 * usb_child_pre_probe() - Pre-probe function for USB devices
 *
 * This is called on all children of hubs and USB controllers (i.e. UCLASS_USB
 * and UCLASS_USB_HUB) when a new device is about to be probed. It sets up the
 * device from the saved platform data and calls usb_select_config() to
 * finish set up.
 *
 * Once this is done, the device's normal driver can take over, knowing the
 * device is accessible on the USB bus.
 *
 * This function is for use only by the internal USB stack.
 *
 * @dev:	Device to set up
 */
int usb_child_pre_probe(struct udevice *dev);

struct ehci_ctrl;

/**
 * usb_setup_ehci_gadget() - Set up a USB device as a gadget
 *
 * TODO(sjg@chromium.org): Tidy this up when USB gadgets can use driver model
 *
 * This provides a way to tell a controller to start up as a USB device
 * instead of as a host. It is untested.
 */
int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp);

/**
 * usb_stor_reset() - Prepare to scan USB storage devices
 *
 * Empty the list of USB storage devices in preparation for scanning them.
 * This must be called before a USB scan.
 */
void usb_stor_reset(void);

#else /* !CONFIG_DM_USB */

struct usb_device *usb_get_dev_index(int index);

#endif

bool usb_device_has_child_on_port(struct usb_device *parent, int port);

int usb_hub_probe(struct usb_device *dev, int ifnum);
void usb_hub_reset(void);

/**
 * legacy_hub_port_reset() - reset a port given its usb_device pointer
 *
 * Reset a hub port and see if a device is present on that port, providing
 * sufficient time for it to show itself. The port status is returned.
 *
 * With driver model this moves to hub_port_reset() and is passed a struct
 * udevice.
 *
 * @dev:	USB device to reset
 * @port:	Port number to reset (note ports are numbered from 0 here)
 * @portstat:	Returns port status
 */
int legacy_hub_port_reset(struct usb_device *dev, int port,
			  unsigned short *portstat);

int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat);

/**
 * usb_alloc_new_device() - Allocate a new device
 *
 * @devp: returns a pointer of a new device structure. With driver model this
 *		is a device pointer, but with legacy USB this pointer is
 *		driver-specific.
 * @return 0 if OK, -ENOSPC if we have found out of room for new devices
 */
int usb_alloc_new_device(struct udevice *controller, struct usb_device **devp);

/**
 * usb_free_device() - Free a partially-inited device
 *
 * This is an internal function. It is used to reverse the action of
 * usb_alloc_new_device() when we hit a problem during init.
 */
void usb_free_device(struct udevice *controller);

int usb_new_device(struct usb_device *dev);

int usb_alloc_device(struct usb_device *dev);

#endif /*_USB_H_ */