summaryrefslogtreecommitdiffstats
path: root/drivers/usb/core/hcd.h
blob: b9de1569b39e792f8de8301b5b3c8b27782100ee (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
/*
 * 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.
 */


#ifdef __KERNEL__

#include <linux/rwsem.h>

/* This file contains declarations of usbcore internals that are mostly
 * used or exposed by Host Controller Drivers.
 */

/*
 * USB Packet IDs (PIDs)
 */
#define USB_PID_EXT			0xf0	/* USB 2.0 LPM ECN */
#define USB_PID_OUT			0xe1
#define USB_PID_ACK			0xd2
#define USB_PID_DATA0			0xc3
#define USB_PID_PING			0xb4	/* USB 2.0 */
#define USB_PID_SOF			0xa5
#define USB_PID_NYET			0x96	/* USB 2.0 */
#define USB_PID_DATA2			0x87	/* USB 2.0 */
#define USB_PID_SPLIT			0x78	/* USB 2.0 */
#define USB_PID_IN			0x69
#define USB_PID_NAK			0x5a
#define USB_PID_DATA1			0x4b
#define USB_PID_PREAMBLE		0x3c	/* Token mode */
#define USB_PID_ERR			0x3c	/* USB 2.0: handshake mode */
#define USB_PID_SETUP			0x2d
#define USB_PID_STALL			0x1e
#define USB_PID_MDATA			0x0f	/* USB 2.0 */

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

/*
 * USB Host Controller Driver (usb_hcd) framework
 *
 * Since "struct usb_bus" is so thin, you can't share much code in it.
 * This framework is a layer over that, and should be more sharable.
 *
 * @authorized_default: Specifies if new devices are authorized to
 *                      connect by default or they require explicit
 *                      user space authorization; this bit is settable
 *                      through /sys/class/usb_host/X/authorized_default.
 *                      For the rest is RO, so we don't lock to r/w it.
 */

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

struct usb_hcd {

	/*
	 * housekeeping
	 */
	struct usb_bus		self;		/* hcd is-a bus */
	struct kref		kref;		/* reference counter */

	const char		*product_desc;	/* product/vendor string */
	char			irq_descr[24];	/* driver + bus # */

	struct timer_list	rh_timer;	/* drives root-hub polling */
	struct urb		*status_urb;	/* the current status urb */
#ifdef CONFIG_PM
	struct work_struct	wakeup_work;	/* for remote wakeup */
#endif

	/*
	 * hardware info/state
	 */
	const struct hc_driver	*driver;	/* hw-specific hooks */

	/* Flags that need to be manipulated atomically */
	unsigned long		flags;
#define HCD_FLAG_HW_ACCESSIBLE	0x00000001
#define HCD_FLAG_SAW_IRQ	0x00000002

	unsigned		rh_registered:1;/* is root hub registered? */

	/* The next flag is a stopgap, to be removed when all the HCDs
	 * support the new root-hub polling mechanism. */
	unsigned		uses_new_polling:1;
	unsigned		poll_rh:1;	/* poll for rh status? */
	unsigned		poll_pending:1;	/* status has changed? */
	unsigned		wireless:1;	/* Wireless USB HCD */
	unsigned		authorized_default:1;
	unsigned		has_tt:1;	/* Integrated TT in root hub */

	int			irq;		/* irq allocated */
	void __iomem		*regs;		/* device memory/io */
	u64			rsrc_start;	/* memory/io resource start */
	u64			rsrc_len;	/* memory/io resource length */
	unsigned		power_budget;	/* in mA, 0 = no limit */

#define HCD_BUFFER_POOLS	4
	struct dma_pool		*pool [HCD_BUFFER_POOLS];

	int			state;
#	define	__ACTIVE		0x01
#	define	__SUSPEND		0x04
#	define	__TRANSIENT		0x80

#	define	HC_STATE_HALT		0
#	define	HC_STATE_RUNNING	(__ACTIVE)
#	define	HC_STATE_QUIESCING	(__SUSPEND|__TRANSIENT|__ACTIVE)
#	define	HC_STATE_RESUMING	(__SUSPEND|__TRANSIENT)
#	define	HC_STATE_SUSPENDED	(__SUSPEND)

#define	HC_IS_RUNNING(state) ((state) & __ACTIVE)
#define	HC_IS_SUSPENDED(state) ((state) & __SUSPEND)

	/* more shared queuing code would be good; it should support
	 * smarter scheduling, handle transaction translators, etc;
	 * input size of periodic table to an interrupt scheduler.
	 * (ohci 32, uhci 1024, ehci 256/512/1024).
	 */

	/* The HC driver's private data is stored at the end of
	 * this structure.
	 */
	unsigned long hcd_priv[0]
			__attribute__ ((aligned(sizeof(unsigned long))));
};

/* 2.4 does this a bit differently ... */
static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
{
	return &hcd->self;
}

static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
{
	return container_of(bus, struct usb_hcd, self);
}

struct hcd_timeout {	/* timeouts we allocate */
	struct list_head	timeout_list;
	struct timer_list	timer;
};

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


struct hc_driver {
	const char	*description;	/* "ehci-hcd" etc */
	const char	*product_desc;	/* product/vendor string */
	size_t		hcd_priv_size;	/* size of private data */

	/* irq handler */
	irqreturn_t	(*irq) (struct usb_hcd *hcd);

	int	flags;
#define	HCD_MEMORY	0x0001		/* HC regs use memory (else I/O) */
#define	HCD_LOCAL_MEM	0x0002		/* HC needs local memory */
#define	HCD_USB11	0x0010		/* USB 1.1 */
#define	HCD_USB2	0x0020		/* USB 2.0 */

	/* called to init HCD and root hub */
	int	(*reset) (struct usb_hcd *hcd);
	int	(*start) (struct usb_hcd *hcd);

	/* NOTE:  these suspend/resume calls relate to the HC as
	 * a whole, not just the root hub; they're for PCI bus glue.
	 */
	/* called after suspending the hub, before entering D3 etc */
	int	(*pci_suspend) (struct usb_hcd *hcd, pm_message_t message);

	/* called after entering D0 (etc), before resuming the hub */
	int	(*pci_resume) (struct usb_hcd *hcd);

	/* cleanly make HCD stop writing memory and doing I/O */
	void	(*stop) (struct usb_hcd *hcd);

	/* shutdown HCD */
	void	(*shutdown) (struct usb_hcd *hcd);

	/* return current frame number */
	int	(*get_frame_number) (struct usb_hcd *hcd);

	/* manage i/o requests, device state */
	int	(*urb_enqueue)(struct usb_hcd *hcd,
				struct urb *urb, gfp_t mem_flags);
	int	(*urb_dequeue)(struct usb_hcd *hcd,
				struct urb *urb, int status);

	/* hw synch, freeing endpoint resources that urb_dequeue can't */
	void 	(*endpoint_disable)(struct usb_hcd *hcd,
			struct usb_host_endpoint *ep);

	/* root hub support */
	int	(*hub_status_data) (struct usb_hcd *hcd, char *buf);
	int	(*hub_control) (struct usb_hcd *hcd,
				u16 typeReq, u16 wValue, u16 wIndex,
				char *buf, u16 wLength);
	int	(*bus_suspend)(struct usb_hcd *);
	int	(*bus_resume)(struct usb_hcd *);
	int	(*start_port_reset)(struct usb_hcd *, unsigned port_num);
	void	(*hub_irq_enable)(struct usb_hcd *);
		/* Needed only if port-change IRQs are level-triggered */

		/* force handover of high-speed port to full-speed companion */
	void	(*relinquish_port)(struct usb_hcd *, int);
		/* has a port been handed over to a companion? */
	int	(*port_handed_over)(struct usb_hcd *, int);
};

extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
		int status);
extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);

extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
extern int usb_hcd_unlink_urb(struct urb *urb, int status);
extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
		int status);
extern void usb_hcd_flush_endpoint(struct usb_device *udev,
		struct usb_host_endpoint *ep);
extern void usb_hcd_disable_endpoint(struct usb_device *udev,
		struct usb_host_endpoint *ep);
extern int usb_hcd_get_frame_number(struct usb_device *udev);

extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
		struct device *dev, char *bus_name);
extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
extern void usb_put_hcd(struct usb_hcd *hcd);
extern int usb_add_hcd(struct usb_hcd *hcd,
		unsigned int irqnum, unsigned long irqflags);
extern void usb_remove_hcd(struct usb_hcd *hcd);

struct platform_device;
extern void usb_hcd_platform_shutdown(struct platform_device *dev);

#ifdef CONFIG_PCI
struct pci_dev;
struct pci_device_id;
extern int usb_hcd_pci_probe(struct pci_dev *dev,
				const struct pci_device_id *id);
extern void usb_hcd_pci_remove(struct pci_dev *dev);

#ifdef CONFIG_PM
extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t state);
extern int usb_hcd_pci_resume(struct pci_dev *dev);
#endif /* CONFIG_PM */

extern void usb_hcd_pci_shutdown(struct pci_dev *dev);

#endif /* CONFIG_PCI */

/* pci-ish (pdev null is ok) buffer alloc/mapping support */
int hcd_buffer_create(struct usb_hcd *hcd);
void hcd_buffer_destroy(struct usb_hcd *hcd);

void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
	gfp_t mem_flags, dma_addr_t *dma);
void hcd_buffer_free(struct usb_bus *bus, size_t size,
	void *addr, dma_addr_t dma);

/* generic bus glue, needed for host controllers that don't use PCI */
extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);

extern void usb_hc_died(struct usb_hcd *hcd);
extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);

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

/* Enumeration is only for the hub driver, or HCD virtual root hubs */
extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
					struct usb_bus *, unsigned port);
extern int usb_new_device(struct usb_device *dev);
extern void usb_disconnect(struct usb_device **);

extern int usb_get_configuration(struct usb_device *dev);
extern void usb_destroy_configuration(struct usb_device *dev);

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

/*
 * HCD Root Hub support
 */

#include "hub.h"

/* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
#define DeviceRequest \
	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
#define DeviceOutRequest \
	((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)

#define InterfaceRequest \
	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)

#define EndpointRequest \
	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
#define EndpointOutRequest \
	((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)

/* class requests from the USB 2.0 hub spec, table 11-15 */
/* GetBusState and SetHubDescriptor are optional, omitted */
#define ClearHubFeature		(0x2000 | USB_REQ_CLEAR_FEATURE)
#define ClearPortFeature	(0x2300 | USB_REQ_CLEAR_FEATURE)
#define GetHubDescriptor	(0xa000 | USB_REQ_GET_DESCRIPTOR)
#define GetHubStatus		(0xa000 | USB_REQ_GET_STATUS)
#define GetPortStatus		(0xa300 | USB_REQ_GET_STATUS)
#define SetHubFeature		(0x2000 | USB_REQ_SET_FEATURE)
#define SetPortFeature		(0x2300 | USB_REQ_SET_FEATURE)


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

/*
 * Generic bandwidth allocation constants/support
 */
#define FRAME_TIME_USECS	1000L
#define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
		/* Trying not to use worst-case bit-stuffing
		 * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
		/* bytecount = data payload byte count */

#define NS_TO_US(ns)	((ns + 500L) / 1000L)
			/* convert & round nanoseconds to microseconds */


/*
 * Full/low speed bandwidth allocation constants/support.
 */
#define BW_HOST_DELAY	1000L		/* nanoseconds */
#define BW_HUB_LS_SETUP	333L		/* nanoseconds */
			/* 4 full-speed bit times (est.) */

#define FRAME_TIME_BITS			12000L	/* frame = 1 millisecond */
#define FRAME_TIME_MAX_BITS_ALLOC	(90L * FRAME_TIME_BITS / 100L)
#define FRAME_TIME_MAX_USECS_ALLOC	(90L * FRAME_TIME_USECS / 100L)

/*
 * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 * to preallocate bandwidth)
 */
#define USB2_HOST_DELAY	5	/* nsec, guess */
#define HS_NSECS(bytes) (((55 * 8 * 2083) \
	+ (2083UL * (3 + BitTime(bytes))))/1000 \
	+ USB2_HOST_DELAY)
#define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
	+ (2083UL * (3 + BitTime(bytes))))/1000 \
	+ USB2_HOST_DELAY)
#define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
#define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))

extern long usb_calc_bus_time(int speed, int is_input,
			int isoc, int bytecount);

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

extern void usb_set_device_state(struct usb_device *udev,
		enum usb_device_state new_state);

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

/* exported only within usbcore */

extern struct list_head usb_bus_list;
extern struct mutex usb_bus_list_lock;
extern wait_queue_head_t usb_kill_urb_queue;

extern void usb_enable_root_hub_irq(struct usb_bus *bus);

extern int usb_find_interface_driver(struct usb_device *dev,
	struct usb_interface *interface);

#define usb_endpoint_out(ep_dir)	(!((ep_dir) & USB_DIR_IN))

#ifdef CONFIG_PM
extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
extern void usb_root_hub_lost_power(struct usb_device *rhdev);
extern int hcd_bus_suspend(struct usb_device *rhdev);
extern int hcd_bus_resume(struct usb_device *rhdev);
#else
static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
{
	return;
}
#endif /* CONFIG_PM */

/*
 * USB device fs stuff
 */

#ifdef CONFIG_USB_DEVICEFS

/*
 * these are expected to be called from the USB core/hub thread
 * with the kernel lock held
 */
extern void usbfs_update_special(void);
extern int usbfs_init(void);
extern void usbfs_cleanup(void);

#else /* CONFIG_USB_DEVICEFS */

static inline void usbfs_update_special(void) {}
static inline int usbfs_init(void) { return 0; }
static inline void usbfs_cleanup(void) { }

#endif /* CONFIG_USB_DEVICEFS */

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

#if defined(CONFIG_USB_MON)

struct usb_mon_operations {
	void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
	void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
	void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
	/* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
};

extern struct usb_mon_operations *mon_ops;

static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
{
	if (bus->monitored)
		(*mon_ops->urb_submit)(bus, urb);
}

static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
    int error)
{
	if (bus->monitored)
		(*mon_ops->urb_submit_error)(bus, urb, error);
}

static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
		int status)
{
	if (bus->monitored)
		(*mon_ops->urb_complete)(bus, urb, status);
}

int usb_mon_register(struct usb_mon_operations *ops);
void usb_mon_deregister(void);

#else

static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
    int error) {}
static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
		int status) {}

#endif /* CONFIG_USB_MON */

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

/* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
/* bleech -- resurfaced in 2.4.11 or 2.4.12 */
#define bitmap 	DeviceRemovable


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

/* random stuff */

#define	RUN_CONTEXT (in_irq() ? "in_irq" \
		: (in_interrupt() ? "in_interrupt" : "can sleep"))


/* This rwsem is for use only by the hub driver and ehci-hcd.
 * Nobody else should touch it.
 */
extern struct rw_semaphore ehci_cf_port_reset_rwsem;

#endif /* __KERNEL__ */
OpenPOWER on IntegriCloud