1 /*
2 * Copyright (c) 2001-2002 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 #ifndef __USB_CORE_HCD_H
20 #define __USB_CORE_HCD_H
21
22 #ifdef __KERNEL__
23
24 #include <linux/rwsem.h>
25
26 #define MAX_TOPO_LEVEL 6
27
28 /* This file contains declarations of usbcore internals that are mostly
29 * used or exposed by Host Controller Drivers.
30 */
31
32 /*
33 * USB Packet IDs (PIDs)
34 */
35 #define USB_PID_EXT 0xf0 /* USB 2.0 LPM ECN */
36 #define USB_PID_OUT 0xe1
37 #define USB_PID_ACK 0xd2
38 #define USB_PID_DATA0 0xc3
39 #define USB_PID_PING 0xb4 /* USB 2.0 */
40 #define USB_PID_SOF 0xa5
41 #define USB_PID_NYET 0x96 /* USB 2.0 */
42 #define USB_PID_DATA2 0x87 /* USB 2.0 */
43 #define USB_PID_SPLIT 0x78 /* USB 2.0 */
44 #define USB_PID_IN 0x69
45 #define USB_PID_NAK 0x5a
46 #define USB_PID_DATA1 0x4b
47 #define USB_PID_PREAMBLE 0x3c /* Token mode */
48 #define USB_PID_ERR 0x3c /* USB 2.0: handshake mode */
49 #define USB_PID_SETUP 0x2d
50 #define USB_PID_STALL 0x1e
51 #define USB_PID_MDATA 0x0f /* USB 2.0 */
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * USB Host Controller Driver (usb_hcd) framework
57 *
58 * Since "struct usb_bus" is so thin, you can't share much code in it.
59 * This framework is a layer over that, and should be more sharable.
60 *
61 * @authorized_default: Specifies if new devices are authorized to
62 * connect by default or they require explicit
63 * user space authorization; this bit is settable
64 * through /sys/class/usb_host/X/authorized_default.
65 * For the rest is RO, so we don't lock to r/w it.
66 */
67
68 /*-------------------------------------------------------------------------*/
69
70 struct usb_hcd {
71
72 /*
73 * housekeeping
74 */
75 struct usb_bus self; /* hcd is-a bus */
76 struct kref kref; /* reference counter */
77
78 const char *product_desc; /* product/vendor string */
79 int speed; /* Speed for this roothub.
80 * May be different from
81 * hcd->driver->flags & HCD_MASK
82 */
83 char irq_descr[24]; /* driver + bus # */
84
85 struct timer_list rh_timer; /* drives root-hub polling */
86 struct urb *status_urb; /* the current status urb */
87 #ifdef CONFIG_USB_SUSPEND
88 struct work_struct wakeup_work; /* for remote wakeup */
89 #endif
90
91 /*
92 * hardware info/state
93 */
94 const struct hc_driver *driver; /* hw-specific hooks */
95
96 /* Flags that need to be manipulated atomically because they can
97 * change while the host controller is running. Always use
98 * set_bit() or clear_bit() to change their values.
99 */
100 unsigned long flags;
101 #define HCD_FLAG_HW_ACCESSIBLE 0 /* at full power */
102 #define HCD_FLAG_POLL_RH 2 /* poll for rh status? */
103 #define HCD_FLAG_POLL_PENDING 3 /* status has changed? */
104 #define HCD_FLAG_WAKEUP_PENDING 4 /* root hub is resuming? */
105 #define HCD_FLAG_RH_RUNNING 5 /* root hub is running? */
106 #define HCD_FLAG_DEAD 6 /* controller has died? */
107
108 /* The flags can be tested using these macros; they are likely to
109 * be slightly faster than test_bit().
110 */
111 #define HCD_HW_ACCESSIBLE(hcd) ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
112 #define HCD_POLL_RH(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
113 #define HCD_POLL_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
114 #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
115 #define HCD_RH_RUNNING(hcd) ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
116 #define HCD_DEAD(hcd) ((hcd)->flags & (1U << HCD_FLAG_DEAD))
117
118 /* Flags that get set only during HCD registration or removal. */
119 unsigned rh_registered:1;/* is root hub registered? */
120 unsigned rh_pollable:1; /* may we poll the root hub? */
121 unsigned msix_enabled:1; /* driver has MSI-X enabled? */
122
123 /* The next flag is a stopgap, to be removed when all the HCDs
124 * support the new root-hub polling mechanism. */
125 unsigned uses_new_polling:1;
126 unsigned wireless:1; /* Wireless USB HCD */
127 unsigned authorized_default:1;
128 unsigned has_tt:1; /* Integrated TT in root hub */
129
130 unsigned int irq; /* irq allocated */
131 void __iomem *regs; /* device memory/io */
132 u64 rsrc_start; /* memory/io resource start */
133 u64 rsrc_len; /* memory/io resource length */
134 unsigned power_budget; /* in mA, 0 = no limit */
135
136 /* bandwidth_mutex should be taken before adding or removing
137 * any new bus bandwidth constraints:
138 * 1. Before adding a configuration for a new device.
139 * 2. Before removing the configuration to put the device into
140 * the addressed state.
141 * 3. Before selecting a different configuration.
142 * 4. Before selecting an alternate interface setting.
143 *
144 * bandwidth_mutex should be dropped after a successful control message
145 * to the device, or resetting the bandwidth after a failed attempt.
146 */
147 struct mutex *bandwidth_mutex;
148 struct usb_hcd *shared_hcd;
149 struct usb_hcd *primary_hcd;
150
151
152 #define HCD_BUFFER_POOLS 4
153 struct dma_pool *pool[HCD_BUFFER_POOLS];
154
155 int state;
156 # define __ACTIVE 0x01
157 # define __SUSPEND 0x04
158 # define __TRANSIENT 0x80
159
160 # define HC_STATE_HALT 0
161 # define HC_STATE_RUNNING (__ACTIVE)
162 # define HC_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
163 # define HC_STATE_RESUMING (__SUSPEND|__TRANSIENT)
164 # define HC_STATE_SUSPENDED (__SUSPEND)
165
166 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
167 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
168
169 /* more shared queuing code would be good; it should support
170 * smarter scheduling, handle transaction translators, etc;
171 * input size of periodic table to an interrupt scheduler.
172 * (ohci 32, uhci 1024, ehci 256/512/1024).
173 */
174
175 /* The HC driver's private data is stored at the end of
176 * this structure.
177 */
178 unsigned long hcd_priv[0]
179 __attribute__ ((aligned(sizeof(s64))));
180 };
181
182 /* 2.4 does this a bit differently ... */
hcd_to_bus(struct usb_hcd * hcd)183 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
184 {
185 return &hcd->self;
186 }
187
bus_to_hcd(struct usb_bus * bus)188 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
189 {
190 return container_of(bus, struct usb_hcd, self);
191 }
192
193 struct hcd_timeout { /* timeouts we allocate */
194 struct list_head timeout_list;
195 struct timer_list timer;
196 };
197
198 /*-------------------------------------------------------------------------*/
199
200
201 struct hc_driver {
202 const char *description; /* "ehci-hcd" etc */
203 const char *product_desc; /* product/vendor string */
204 size_t hcd_priv_size; /* size of private data */
205
206 /* irq handler */
207 irqreturn_t (*irq) (struct usb_hcd *hcd);
208
209 int flags;
210 #define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
211 #define HCD_LOCAL_MEM 0x0002 /* HC needs local memory */
212 #define HCD_SHARED 0x0004 /* Two (or more) usb_hcds share HW */
213 #define HCD_USB11 0x0010 /* USB 1.1 */
214 #define HCD_USB2 0x0020 /* USB 2.0 */
215 #define HCD_USB3 0x0040 /* USB 3.0 */
216 #define HCD_MASK 0x0070
217
218 /* called to init HCD and root hub */
219 int (*reset) (struct usb_hcd *hcd);
220 int (*start) (struct usb_hcd *hcd);
221
222 /* NOTE: these suspend/resume calls relate to the HC as
223 * a whole, not just the root hub; they're for PCI bus glue.
224 */
225 /* called after suspending the hub, before entering D3 etc */
226 int (*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
227
228 /* called after entering D0 (etc), before resuming the hub */
229 int (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
230
231 /* cleanly make HCD stop writing memory and doing I/O */
232 void (*stop) (struct usb_hcd *hcd);
233
234 /* shutdown HCD */
235 void (*shutdown) (struct usb_hcd *hcd);
236
237 /* return current frame number */
238 int (*get_frame_number) (struct usb_hcd *hcd);
239
240 /* manage i/o requests, device state */
241 int (*urb_enqueue)(struct usb_hcd *hcd,
242 struct urb *urb, gfp_t mem_flags);
243 int (*urb_dequeue)(struct usb_hcd *hcd,
244 struct urb *urb, int status);
245
246 /*
247 * (optional) these hooks allow an HCD to override the default DMA
248 * mapping and unmapping routines. In general, they shouldn't be
249 * necessary unless the host controller has special DMA requirements,
250 * such as alignment contraints. If these are not specified, the
251 * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
252 * (and it may be a good idea to call these functions in your HCD
253 * implementation)
254 */
255 int (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
256 gfp_t mem_flags);
257 void (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
258
259 /* hw synch, freeing endpoint resources that urb_dequeue can't */
260 void (*endpoint_disable)(struct usb_hcd *hcd,
261 struct usb_host_endpoint *ep);
262
263 /* (optional) reset any endpoint state such as sequence number
264 and current window */
265 void (*endpoint_reset)(struct usb_hcd *hcd,
266 struct usb_host_endpoint *ep);
267
268 /* root hub support */
269 int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
270 int (*hub_control) (struct usb_hcd *hcd,
271 u16 typeReq, u16 wValue, u16 wIndex,
272 char *buf, u16 wLength);
273 int (*bus_suspend)(struct usb_hcd *);
274 int (*bus_resume)(struct usb_hcd *);
275 int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
276
277 /* force handover of high-speed port to full-speed companion */
278 void (*relinquish_port)(struct usb_hcd *, int);
279 /* has a port been handed over to a companion? */
280 int (*port_handed_over)(struct usb_hcd *, int);
281
282 /* CLEAR_TT_BUFFER completion callback */
283 void (*clear_tt_buffer_complete)(struct usb_hcd *,
284 struct usb_host_endpoint *);
285
286 /* xHCI specific functions */
287 /* Called by usb_alloc_dev to alloc HC device structures */
288 int (*alloc_dev)(struct usb_hcd *, struct usb_device *);
289 /* Called by usb_disconnect to free HC device structures */
290 void (*free_dev)(struct usb_hcd *, struct usb_device *);
291 /* Change a group of bulk endpoints to support multiple stream IDs */
292 int (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
293 struct usb_host_endpoint **eps, unsigned int num_eps,
294 unsigned int num_streams, gfp_t mem_flags);
295 /* Reverts a group of bulk endpoints back to not using stream IDs.
296 * Can fail if we run out of memory.
297 */
298 int (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
299 struct usb_host_endpoint **eps, unsigned int num_eps,
300 gfp_t mem_flags);
301
302 /* Bandwidth computation functions */
303 /* Note that add_endpoint() can only be called once per endpoint before
304 * check_bandwidth() or reset_bandwidth() must be called.
305 * drop_endpoint() can only be called once per endpoint also.
306 * A call to xhci_drop_endpoint() followed by a call to
307 * xhci_add_endpoint() will add the endpoint to the schedule with
308 * possibly new parameters denoted by a different endpoint descriptor
309 * in usb_host_endpoint. A call to xhci_add_endpoint() followed by a
310 * call to xhci_drop_endpoint() is not allowed.
311 */
312 /* Allocate endpoint resources and add them to a new schedule */
313 int (*add_endpoint)(struct usb_hcd *, struct usb_device *,
314 struct usb_host_endpoint *);
315 /* Drop an endpoint from a new schedule */
316 int (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
317 struct usb_host_endpoint *);
318 /* Check that a new hardware configuration, set using
319 * endpoint_enable and endpoint_disable, does not exceed bus
320 * bandwidth. This must be called before any set configuration
321 * or set interface requests are sent to the device.
322 */
323 int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
324 /* Reset the device schedule to the last known good schedule,
325 * which was set from a previous successful call to
326 * check_bandwidth(). This reverts any add_endpoint() and
327 * drop_endpoint() calls since that last successful call.
328 * Used for when a check_bandwidth() call fails due to resource
329 * or bandwidth constraints.
330 */
331 void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
332 /* Returns the hardware-chosen device address */
333 int (*address_device)(struct usb_hcd *, struct usb_device *udev);
334 /* Notifies the HCD after a hub descriptor is fetched.
335 * Will block.
336 */
337 int (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
338 struct usb_tt *tt, gfp_t mem_flags);
339 int (*reset_device)(struct usb_hcd *, struct usb_device *);
340 /* Notifies the HCD after a device is connected and its
341 * address is set
342 */
343 int (*update_device)(struct usb_hcd *, struct usb_device *);
344 int (*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
345 };
346
347 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
348 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
349 int status);
350 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
351
352 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
353 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
354 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
355 int status);
356 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
357 gfp_t mem_flags);
358 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
359 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
360 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
361 struct usb_host_endpoint *ep);
362 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
363 struct usb_host_endpoint *ep);
364 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
365 struct usb_host_endpoint *ep);
366 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
367 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
368 struct usb_host_config *new_config,
369 struct usb_host_interface *old_alt,
370 struct usb_host_interface *new_alt);
371 extern int usb_hcd_get_frame_number(struct usb_device *udev);
372
373 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
374 struct device *dev, const char *bus_name);
375 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
376 struct device *dev, const char *bus_name,
377 struct usb_hcd *shared_hcd);
378 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
379 extern void usb_put_hcd(struct usb_hcd *hcd);
380 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
381 extern int usb_add_hcd(struct usb_hcd *hcd,
382 unsigned int irqnum, unsigned long irqflags);
383 extern void usb_remove_hcd(struct usb_hcd *hcd);
384
385 struct platform_device;
386 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
387
388 #ifdef CONFIG_PCI
389 struct pci_dev;
390 struct pci_device_id;
391 extern int usb_hcd_pci_probe(struct pci_dev *dev,
392 const struct pci_device_id *id);
393 extern void usb_hcd_pci_remove(struct pci_dev *dev);
394 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
395
396 #ifdef CONFIG_PM
397 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
398 #endif
399 #endif /* CONFIG_PCI */
400
401 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
402 int hcd_buffer_create(struct usb_hcd *hcd);
403 void hcd_buffer_destroy(struct usb_hcd *hcd);
404
405 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
406 gfp_t mem_flags, dma_addr_t *dma);
407 void hcd_buffer_free(struct usb_bus *bus, size_t size,
408 void *addr, dma_addr_t dma);
409
410 /* generic bus glue, needed for host controllers that don't use PCI */
411 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
412
413 extern void usb_hc_died(struct usb_hcd *hcd);
414 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
415 extern void usb_wakeup_notification(struct usb_device *hdev,
416 unsigned int portnum);
417
418 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
419 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
420 #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
421 #define usb_settoggle(dev, ep, out, bit) \
422 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
423 ((bit) << (ep)))
424
425 /* -------------------------------------------------------------------------- */
426
427 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
428 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
429 struct usb_bus *, unsigned port);
430 extern int usb_new_device(struct usb_device *dev);
431 extern void usb_disconnect(struct usb_device **);
432
433 extern int usb_get_configuration(struct usb_device *dev);
434 extern void usb_destroy_configuration(struct usb_device *dev);
435
436 /*-------------------------------------------------------------------------*/
437
438 /*
439 * HCD Root Hub support
440 */
441
442 #include <linux/usb/ch11.h>
443
444 /*
445 * As of USB 2.0, full/low speed devices are segregated into trees.
446 * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
447 * The other type grows from high speed hubs when they connect to
448 * full/low speed devices using "Transaction Translators" (TTs).
449 *
450 * TTs should only be known to the hub driver, and high speed bus
451 * drivers (only EHCI for now). They affect periodic scheduling and
452 * sometimes control/bulk error recovery.
453 */
454
455 struct usb_device;
456
457 struct usb_tt {
458 struct usb_device *hub; /* upstream highspeed hub */
459 int multi; /* true means one TT per port */
460 unsigned think_time; /* think time in ns */
461
462 /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
463 spinlock_t lock;
464 struct list_head clear_list; /* of usb_tt_clear */
465 struct work_struct clear_work;
466 };
467
468 struct usb_tt_clear {
469 struct list_head clear_list;
470 unsigned tt;
471 u16 devinfo;
472 struct usb_hcd *hcd;
473 struct usb_host_endpoint *ep;
474 };
475
476 extern int usb_hub_clear_tt_buffer(struct urb *urb);
477 extern void usb_ep0_reinit(struct usb_device *);
478
479 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
480 #define DeviceRequest \
481 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
482 #define DeviceOutRequest \
483 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
484
485 #define InterfaceRequest \
486 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
487
488 #define EndpointRequest \
489 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
490 #define EndpointOutRequest \
491 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
492
493 /* class requests from the USB 2.0 hub spec, table 11-15 */
494 /* GetBusState and SetHubDescriptor are optional, omitted */
495 #define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
496 #define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
497 #define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
498 #define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
499 #define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
500 #define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
501 #define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
502
503
504 /*-------------------------------------------------------------------------*/
505
506 /* class requests from USB 3.0 hub spec, table 10-5 */
507 #define SetHubDepth (0x3000 | HUB_SET_DEPTH)
508 #define GetPortErrorCount (0x8000 | HUB_GET_PORT_ERR_COUNT)
509
510 /*
511 * Generic bandwidth allocation constants/support
512 */
513 #define FRAME_TIME_USECS 1000L
514 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
515 /* Trying not to use worst-case bit-stuffing
516 * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
517 /* bytecount = data payload byte count */
518
519 #define NS_TO_US(ns) ((ns + 500L) / 1000L)
520 /* convert & round nanoseconds to microseconds */
521
522
523 /*
524 * Full/low speed bandwidth allocation constants/support.
525 */
526 #define BW_HOST_DELAY 1000L /* nanoseconds */
527 #define BW_HUB_LS_SETUP 333L /* nanoseconds */
528 /* 4 full-speed bit times (est.) */
529
530 #define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
531 #define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
532 #define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
533
534 /*
535 * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
536 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
537 * to preallocate bandwidth)
538 */
539 #define USB2_HOST_DELAY 5 /* nsec, guess */
540 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
541 + (2083UL * (3 + BitTime(bytes))))/1000 \
542 + USB2_HOST_DELAY)
543 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
544 + (2083UL * (3 + BitTime(bytes))))/1000 \
545 + USB2_HOST_DELAY)
546 #define HS_USECS(bytes) NS_TO_US(HS_NSECS(bytes))
547 #define HS_USECS_ISO(bytes) NS_TO_US(HS_NSECS_ISO(bytes))
548
549 extern long usb_calc_bus_time(int speed, int is_input,
550 int isoc, int bytecount);
551
552 /*-------------------------------------------------------------------------*/
553
554 extern void usb_set_device_state(struct usb_device *udev,
555 enum usb_device_state new_state);
556
557 /*-------------------------------------------------------------------------*/
558
559 /* exported only within usbcore */
560
561 extern struct list_head usb_bus_list;
562 extern struct mutex usb_bus_list_lock;
563 extern wait_queue_head_t usb_kill_urb_queue;
564
565 extern int usb_find_interface_driver(struct usb_device *dev,
566 struct usb_interface *interface);
567
568 #define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
569
570 #ifdef CONFIG_PM
571 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
572 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
573 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
574 #endif /* CONFIG_PM */
575
576 #ifdef CONFIG_USB_SUSPEND
577 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
578 #else
usb_hcd_resume_root_hub(struct usb_hcd * hcd)579 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
580 {
581 return;
582 }
583 #endif /* CONFIG_USB_SUSPEND */
584
585
586 /*
587 * USB device fs stuff
588 */
589
590 #ifdef CONFIG_USB_DEVICEFS
591
592 /*
593 * these are expected to be called from the USB core/hub thread
594 * with the kernel lock held
595 */
596 extern void usbfs_update_special(void);
597 extern int usbfs_init(void);
598 extern void usbfs_cleanup(void);
599
600 #else /* CONFIG_USB_DEVICEFS */
601
usbfs_update_special(void)602 static inline void usbfs_update_special(void) {}
usbfs_init(void)603 static inline int usbfs_init(void) { return 0; }
usbfs_cleanup(void)604 static inline void usbfs_cleanup(void) { }
605
606 #endif /* CONFIG_USB_DEVICEFS */
607
608 /*-------------------------------------------------------------------------*/
609
610 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
611
612 struct usb_mon_operations {
613 void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
614 void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
615 void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
616 /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
617 };
618
619 extern struct usb_mon_operations *mon_ops;
620
usbmon_urb_submit(struct usb_bus * bus,struct urb * urb)621 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
622 {
623 if (bus->monitored)
624 (*mon_ops->urb_submit)(bus, urb);
625 }
626
usbmon_urb_submit_error(struct usb_bus * bus,struct urb * urb,int error)627 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
628 int error)
629 {
630 if (bus->monitored)
631 (*mon_ops->urb_submit_error)(bus, urb, error);
632 }
633
usbmon_urb_complete(struct usb_bus * bus,struct urb * urb,int status)634 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
635 int status)
636 {
637 if (bus->monitored)
638 (*mon_ops->urb_complete)(bus, urb, status);
639 }
640
641 int usb_mon_register(struct usb_mon_operations *ops);
642 void usb_mon_deregister(void);
643
644 #else
645
usbmon_urb_submit(struct usb_bus * bus,struct urb * urb)646 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
usbmon_urb_submit_error(struct usb_bus * bus,struct urb * urb,int error)647 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
648 int error) {}
usbmon_urb_complete(struct usb_bus * bus,struct urb * urb,int status)649 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
650 int status) {}
651
652 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
653
654 /*-------------------------------------------------------------------------*/
655
656 /* random stuff */
657
658 #define RUN_CONTEXT (in_irq() ? "in_irq" \
659 : (in_interrupt() ? "in_interrupt" : "can sleep"))
660
661
662 /* This rwsem is for use only by the hub driver and ehci-hcd.
663 * Nobody else should touch it.
664 */
665 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
666
667 /* Keep track of which host controller drivers are loaded */
668 #define USB_UHCI_LOADED 0
669 #define USB_OHCI_LOADED 1
670 #define USB_EHCI_LOADED 2
671 extern unsigned long usb_hcds_loaded;
672
673 #endif /* __KERNEL__ */
674
675 #endif /* __USB_CORE_HCD_H */
676