2 * Copyright (c) 2001-2002 by David Brownell
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.
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
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.
19 #ifndef __USB_CORE_HCD_H
20 #define __USB_CORE_HCD_H
24 #include <linux/rwsem.h>
26 #define MAX_TOPO_LEVEL 6
28 /* This file contains declarations of usbcore internals that are mostly
29 * used or exposed by Host Controller Drivers.
33 * USB Packet IDs (PIDs)
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 */
53 /*-------------------------------------------------------------------------*/
56 * USB Host Controller Driver (usb_hcd) framework
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.
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.
68 /*-------------------------------------------------------------------------*/
75 struct usb_bus self; /* hcd is-a bus */
76 struct kref kref; /* reference counter */
78 const char *product_desc; /* product/vendor string */
79 char irq_descr[24]; /* driver + bus # */
81 struct timer_list rh_timer; /* drives root-hub polling */
82 struct urb *status_urb; /* the current status urb */
84 struct work_struct wakeup_work; /* for remote wakeup */
90 const struct hc_driver *driver; /* hw-specific hooks */
92 /* Flags that need to be manipulated atomically */
94 #define HCD_FLAG_HW_ACCESSIBLE 0x00000001
95 #define HCD_FLAG_SAW_IRQ 0x00000002
97 unsigned rh_registered:1;/* is root hub registered? */
99 /* The next flag is a stopgap, to be removed when all the HCDs
100 * support the new root-hub polling mechanism. */
101 unsigned uses_new_polling:1;
102 unsigned poll_rh:1; /* poll for rh status? */
103 unsigned poll_pending:1; /* status has changed? */
104 unsigned wireless:1; /* Wireless USB HCD */
105 unsigned authorized_default:1;
106 unsigned has_tt:1; /* Integrated TT in root hub */
108 int irq; /* irq allocated */
109 void __iomem *regs; /* device memory/io */
110 u64 rsrc_start; /* memory/io resource start */
111 u64 rsrc_len; /* memory/io resource length */
112 unsigned power_budget; /* in mA, 0 = no limit */
114 #define HCD_BUFFER_POOLS 4
115 struct dma_pool *pool [HCD_BUFFER_POOLS];
118 # define __ACTIVE 0x01
119 # define __SUSPEND 0x04
120 # define __TRANSIENT 0x80
122 # define HC_STATE_HALT 0
123 # define HC_STATE_RUNNING (__ACTIVE)
124 # define HC_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
125 # define HC_STATE_RESUMING (__SUSPEND|__TRANSIENT)
126 # define HC_STATE_SUSPENDED (__SUSPEND)
128 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
129 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
131 /* more shared queuing code would be good; it should support
132 * smarter scheduling, handle transaction translators, etc;
133 * input size of periodic table to an interrupt scheduler.
134 * (ohci 32, uhci 1024, ehci 256/512/1024).
137 /* The HC driver's private data is stored at the end of
140 unsigned long hcd_priv[0]
141 __attribute__ ((aligned(sizeof(unsigned long))));
144 /* 2.4 does this a bit differently ... */
145 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
150 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
152 return container_of(bus, struct usb_hcd, self);
155 struct hcd_timeout { /* timeouts we allocate */
156 struct list_head timeout_list;
157 struct timer_list timer;
160 /*-------------------------------------------------------------------------*/
164 const char *description; /* "ehci-hcd" etc */
165 const char *product_desc; /* product/vendor string */
166 size_t hcd_priv_size; /* size of private data */
169 irqreturn_t (*irq) (struct usb_hcd *hcd);
172 #define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
173 #define HCD_LOCAL_MEM 0x0002 /* HC needs local memory */
174 #define HCD_USB11 0x0010 /* USB 1.1 */
175 #define HCD_USB2 0x0020 /* USB 2.0 */
177 /* called to init HCD and root hub */
178 int (*reset) (struct usb_hcd *hcd);
179 int (*start) (struct usb_hcd *hcd);
181 /* NOTE: these suspend/resume calls relate to the HC as
182 * a whole, not just the root hub; they're for PCI bus glue.
184 /* called after suspending the hub, before entering D3 etc */
185 int (*pci_suspend) (struct usb_hcd *hcd, pm_message_t message);
187 /* called after entering D0 (etc), before resuming the hub */
188 int (*pci_resume) (struct usb_hcd *hcd);
190 /* cleanly make HCD stop writing memory and doing I/O */
191 void (*stop) (struct usb_hcd *hcd);
194 void (*shutdown) (struct usb_hcd *hcd);
196 /* return current frame number */
197 int (*get_frame_number) (struct usb_hcd *hcd);
199 /* manage i/o requests, device state */
200 int (*urb_enqueue)(struct usb_hcd *hcd,
201 struct urb *urb, gfp_t mem_flags);
202 int (*urb_dequeue)(struct usb_hcd *hcd,
203 struct urb *urb, int status);
205 /* hw synch, freeing endpoint resources that urb_dequeue can't */
206 void (*endpoint_disable)(struct usb_hcd *hcd,
207 struct usb_host_endpoint *ep);
209 /* (optional) reset any endpoint state such as sequence number
210 and current window */
211 void (*endpoint_reset)(struct usb_hcd *hcd,
212 struct usb_host_endpoint *ep);
214 /* root hub support */
215 int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
216 int (*hub_control) (struct usb_hcd *hcd,
217 u16 typeReq, u16 wValue, u16 wIndex,
218 char *buf, u16 wLength);
219 int (*bus_suspend)(struct usb_hcd *);
220 int (*bus_resume)(struct usb_hcd *);
221 int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
223 /* force handover of high-speed port to full-speed companion */
224 void (*relinquish_port)(struct usb_hcd *, int);
225 /* has a port been handed over to a companion? */
226 int (*port_handed_over)(struct usb_hcd *, int);
229 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
230 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
232 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
234 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
235 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
236 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
238 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
239 struct usb_host_endpoint *ep);
240 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
241 struct usb_host_endpoint *ep);
242 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
243 struct usb_host_endpoint *ep);
244 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
245 extern int usb_hcd_get_frame_number(struct usb_device *udev);
247 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
248 struct device *dev, const char *bus_name);
249 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
250 extern void usb_put_hcd(struct usb_hcd *hcd);
251 extern int usb_add_hcd(struct usb_hcd *hcd,
252 unsigned int irqnum, unsigned long irqflags);
253 extern void usb_remove_hcd(struct usb_hcd *hcd);
255 struct platform_device;
256 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
260 struct pci_device_id;
261 extern int usb_hcd_pci_probe(struct pci_dev *dev,
262 const struct pci_device_id *id);
263 extern void usb_hcd_pci_remove(struct pci_dev *dev);
266 extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t msg);
267 extern int usb_hcd_pci_resume(struct pci_dev *dev);
268 #endif /* CONFIG_PM */
270 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
272 #endif /* CONFIG_PCI */
274 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
275 int hcd_buffer_create(struct usb_hcd *hcd);
276 void hcd_buffer_destroy(struct usb_hcd *hcd);
278 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
279 gfp_t mem_flags, dma_addr_t *dma);
280 void hcd_buffer_free(struct usb_bus *bus, size_t size,
281 void *addr, dma_addr_t dma);
283 /* generic bus glue, needed for host controllers that don't use PCI */
284 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
286 extern void usb_hc_died(struct usb_hcd *hcd);
287 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
289 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
290 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
291 #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
292 #define usb_settoggle(dev, ep, out, bit) \
293 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
296 /* -------------------------------------------------------------------------- */
298 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
299 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
300 struct usb_bus *, unsigned port);
301 extern int usb_new_device(struct usb_device *dev);
302 extern void usb_disconnect(struct usb_device **);
304 extern int usb_get_configuration(struct usb_device *dev);
305 extern void usb_destroy_configuration(struct usb_device *dev);
307 /*-------------------------------------------------------------------------*/
310 * HCD Root Hub support
315 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
316 #define DeviceRequest \
317 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
318 #define DeviceOutRequest \
319 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
321 #define InterfaceRequest \
322 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
324 #define EndpointRequest \
325 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
326 #define EndpointOutRequest \
327 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
329 /* class requests from the USB 2.0 hub spec, table 11-15 */
330 /* GetBusState and SetHubDescriptor are optional, omitted */
331 #define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
332 #define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
333 #define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
334 #define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
335 #define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
336 #define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
337 #define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
340 /*-------------------------------------------------------------------------*/
343 * Generic bandwidth allocation constants/support
345 #define FRAME_TIME_USECS 1000L
346 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
347 /* Trying not to use worst-case bit-stuffing
348 * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
349 /* bytecount = data payload byte count */
351 #define NS_TO_US(ns) ((ns + 500L) / 1000L)
352 /* convert & round nanoseconds to microseconds */
356 * Full/low speed bandwidth allocation constants/support.
358 #define BW_HOST_DELAY 1000L /* nanoseconds */
359 #define BW_HUB_LS_SETUP 333L /* nanoseconds */
360 /* 4 full-speed bit times (est.) */
362 #define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
363 #define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
364 #define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
367 * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
368 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
369 * to preallocate bandwidth)
371 #define USB2_HOST_DELAY 5 /* nsec, guess */
372 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
373 + (2083UL * (3 + BitTime(bytes))))/1000 \
375 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
376 + (2083UL * (3 + BitTime(bytes))))/1000 \
378 #define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
379 #define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))
381 extern long usb_calc_bus_time(int speed, int is_input,
382 int isoc, int bytecount);
384 /*-------------------------------------------------------------------------*/
386 extern void usb_set_device_state(struct usb_device *udev,
387 enum usb_device_state new_state);
389 /*-------------------------------------------------------------------------*/
391 /* exported only within usbcore */
393 extern struct list_head usb_bus_list;
394 extern struct mutex usb_bus_list_lock;
395 extern wait_queue_head_t usb_kill_urb_queue;
397 extern int usb_find_interface_driver(struct usb_device *dev,
398 struct usb_interface *interface);
400 #define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
403 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
404 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
405 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
406 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
408 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
412 #endif /* CONFIG_PM */
415 * USB device fs stuff
418 #ifdef CONFIG_USB_DEVICEFS
421 * these are expected to be called from the USB core/hub thread
422 * with the kernel lock held
424 extern void usbfs_update_special(void);
425 extern int usbfs_init(void);
426 extern void usbfs_cleanup(void);
428 #else /* CONFIG_USB_DEVICEFS */
430 static inline void usbfs_update_special(void) {}
431 static inline int usbfs_init(void) { return 0; }
432 static inline void usbfs_cleanup(void) { }
434 #endif /* CONFIG_USB_DEVICEFS */
436 /*-------------------------------------------------------------------------*/
438 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
440 struct usb_mon_operations {
441 void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
442 void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
443 void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
444 /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
447 extern struct usb_mon_operations *mon_ops;
449 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
452 (*mon_ops->urb_submit)(bus, urb);
455 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
459 (*mon_ops->urb_submit_error)(bus, urb, error);
462 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
466 (*mon_ops->urb_complete)(bus, urb, status);
469 int usb_mon_register(struct usb_mon_operations *ops);
470 void usb_mon_deregister(void);
474 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
475 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
477 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
480 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
482 /*-------------------------------------------------------------------------*/
484 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
485 /* bleech -- resurfaced in 2.4.11 or 2.4.12 */
486 #define bitmap DeviceRemovable
489 /*-------------------------------------------------------------------------*/
493 #define RUN_CONTEXT (in_irq() ? "in_irq" \
494 : (in_interrupt() ? "in_interrupt" : "can sleep"))
497 /* This rwsem is for use only by the hub driver and ehci-hcd.
498 * Nobody else should touch it.
500 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
502 /* Keep track of which host controller drivers are loaded */
503 #define USB_UHCI_LOADED 0
504 #define USB_OHCI_LOADED 1
505 #define USB_EHCI_LOADED 2
506 extern unsigned long usb_hcds_loaded;
508 #endif /* __KERNEL__ */
510 #endif /* __USB_CORE_HCD_H */