* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#ifndef __USB_CORE_HCD_H
+#define __USB_CORE_HCD_H
#ifdef __KERNEL__
+#include <linux/rwsem.h>
+
+#define MAX_TOPO_LEVEL 6
+
/* This file contains declarations of usbcore internals that are mostly
* used or exposed by Host Controller Drivers.
*/
/*
* USB Packet IDs (PIDs)
*/
-#define USB_PID_UNDEF_0 0xf0
+#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
*
* 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 { /* usb_bus.hcpriv points to this */
+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 */
+ 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 */
- unsigned saw_irq : 1;
- unsigned can_wakeup:1; /* hw supports wakeup? */
- unsigned remote_wakeup:1;/* sw should use wakeup? */
+
+ /* 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 */
+
+ /* bandwidth_mutex should be taken before adding or removing
+ * any new bus bandwidth constraints:
+ * 1. Before adding a configuration for a new device.
+ * 2. Before removing the configuration to put the device into
+ * the addressed state.
+ * 3. Before selecting a different configuration.
+ * 4. Before selecting an alternate interface setting.
+ *
+ * bandwidth_mutex should be dropped after a successful control message
+ * to the device, or resetting the bandwidth after a failed attempt.
+ */
+ struct mutex bandwidth_mutex;
+
#define HCD_BUFFER_POOLS 4
struct dma_pool *pool [HCD_BUFFER_POOLS];
/* 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.
+ * input size of periodic table to an interrupt scheduler.
* (ohci 32, uhci 1024, ehci 256/512/1024).
*/
* this structure.
*/
unsigned long hcd_priv[0]
- __attribute__ ((aligned (sizeof(unsigned long))));
+ __attribute__ ((aligned(sizeof(unsigned long))));
};
/* 2.4 does this a bit differently ... */
-static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
+static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
{
return &hcd->self;
}
-
-// urb.hcpriv is really hardware-specific
+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;
/*-------------------------------------------------------------------------*/
-/*
- * FIXME usb_operations should vanish or become hc_driver,
- * when usb_bus and usb_hcd become the same thing.
- */
-
-struct usb_operations {
- int (*get_frame_number) (struct usb_device *usb_dev);
- int (*submit_urb) (struct urb *urb, int mem_flags);
- int (*unlink_urb) (struct urb *urb, int status);
-
- /* allocate dma-consistent buffer for URB_DMA_NOMAPPING */
- void *(*buffer_alloc)(struct usb_bus *bus, size_t size,
- int mem_flags,
- dma_addr_t *dma);
- void (*buffer_free)(struct usb_bus *bus, size_t size,
- void *addr, dma_addr_t dma);
-
- void (*disable)(struct usb_device *udev,
- struct usb_host_endpoint *ep);
-
- /* global suspend/resume of bus */
- int (*hub_suspend)(struct usb_bus *);
- int (*hub_resume)(struct usb_bus *);
-};
-
-/* each driver provides one of these, and hardware init support */
-
-struct pt_regs;
struct hc_driver {
const char *description; /* "ehci-hcd" etc */
size_t hcd_priv_size; /* size of private data */
/* irq handler */
- irqreturn_t (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
+ 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 */
+#define HCD_USB3 0x0040 /* USB 3.0 */
+#define HCD_MASK 0x0070
/* 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 bus glue.
+ * a whole, not just the root hub; they're for PCI bus glue.
*/
- /* called after all devices were suspended */
- int (*suspend) (struct usb_hcd *hcd, pm_message_t message);
+ /* called after suspending the hub, before entering D3 etc */
+ int (*pci_suspend)(struct usb_hcd *hcd);
- /* called before any devices get resumed */
- int (*resume) (struct usb_hcd *hcd);
+ /* called after entering D0 (etc), before resuming the hub */
+ int (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
/* 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 usb_host_endpoint *ep,
- struct urb *urb,
- int mem_flags);
- int (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
+ 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);
+ /* (optional) reset any endpoint state such as sequence number
+ and current window */
+ void (*endpoint_reset)(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,
+ 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 (*hub_suspend)(struct usb_hcd *);
- int (*hub_resume)(struct usb_hcd *);
- int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
+ int (*bus_suspend)(struct usb_hcd *);
+ int (*bus_resume)(struct usb_hcd *);
+ int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
+
+ /* 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);
+
+ /* CLEAR_TT_BUFFER completion callback */
+ void (*clear_tt_buffer_complete)(struct usb_hcd *,
+ struct usb_host_endpoint *);
+
+ /* xHCI specific functions */
+ /* Called by usb_alloc_dev to alloc HC device structures */
+ int (*alloc_dev)(struct usb_hcd *, struct usb_device *);
+ /* Called by usb_release_dev to free HC device structures */
+ void (*free_dev)(struct usb_hcd *, struct usb_device *);
+
+ /* Bandwidth computation functions */
+ /* Note that add_endpoint() can only be called once per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * drop_endpoint() can only be called once per endpoint also.
+ * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+ * add the endpoint to the schedule with possibly new parameters denoted by a
+ * different endpoint descriptor in usb_host_endpoint.
+ * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+ * not allowed.
+ */
+ /* Allocate endpoint resources and add them to a new schedule */
+ int (*add_endpoint)(struct usb_hcd *, struct usb_device *, struct usb_host_endpoint *);
+ /* Drop an endpoint from a new schedule */
+ int (*drop_endpoint)(struct usb_hcd *, struct usb_device *, struct usb_host_endpoint *);
+ /* Check that a new hardware configuration, set using
+ * endpoint_enable and endpoint_disable, does not exceed bus
+ * bandwidth. This must be called before any set configuration
+ * or set interface requests are sent to the device.
+ */
+ int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
+ /* Reset the device schedule to the last known good schedule,
+ * which was set from a previous successful call to
+ * check_bandwidth(). This reverts any add_endpoint() and
+ * drop_endpoint() calls since that last successful call.
+ * Used for when a check_bandwidth() call fails due to resource
+ * or bandwidth constraints.
+ */
+ void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
+ /* Returns the hardware-chosen device address */
+ int (*address_device)(struct usb_hcd *, struct usb_device *udev);
+ /* Notifies the HCD after a hub descriptor is fetched.
+ * Will block.
+ */
+ int (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
+ struct usb_tt *tt, gfp_t mem_flags);
};
-extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs);
-
-extern struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
- struct device *dev, char *bus_name);
-extern void usb_put_hcd (struct usb_hcd *hcd);
+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 void usb_hcd_reset_endpoint(struct usb_device *udev,
+ struct usb_host_endpoint *ep);
+extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
+extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
+ struct usb_host_config *new_config,
+ struct usb_host_interface *old_alt,
+ struct usb_host_interface *new_alt);
+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, const 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,
+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_remove(struct pci_dev *dev);
+extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
+#ifdef CONFIG_PM_SLEEP
+extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
+#endif
#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);
+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,
- int mem_flags, dma_addr_t *dma);
-void hcd_buffer_free (struct usb_bus *bus, size_t size,
+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, struct pt_regs *r);
-extern void usb_hc_died (struct usb_hcd *hcd);
+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);
+
+/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
+#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)))
/* -------------------------------------------------------------------------- */
* Generic bandwidth allocation constants/support
*/
#define FRAME_TIME_USECS 1000L
-#define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
+#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 */
+ * 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 */
-extern void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb,
- int bustime, int isoc);
-extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
- int isoc);
/*
* 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.) */
+ /* 4 full-speed bit times (est.) */
-#define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
+#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)
-extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
-
/*
- * Ceiling microseconds (typical) for that many bytes at high speed
+ * 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_USECS(bytes) NS_TO_US ( ((55 * 8 * 2083)/1000) \
- + ((2083UL * (3167 + BitTime (bytes)))/1000) \
+#define HS_NSECS(bytes) (((55 * 8 * 2083) \
+ + (2083UL * (3 + BitTime(bytes))))/1000 \
+ USB2_HOST_DELAY)
-#define HS_USECS_ISO(bytes) NS_TO_US ( ((38 * 8 * 2083)/1000) \
- + ((2083UL * (3167 + BitTime (bytes)))/1000) \
+#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,
+extern long usb_calc_bus_time(int speed, int is_input,
int isoc, int bytecount);
/*-------------------------------------------------------------------------*/
-extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
-
-extern int usb_hcd_register_root_hub (struct usb_device *usb_dev,
- struct usb_hcd *hcd);
-
-extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
-
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 semaphore usb_bus_list_lock;
+extern struct mutex usb_bus_list_lock;
extern wait_queue_head_t usb_kill_urb_queue;
-extern struct usb_bus *usb_bus_get (struct usb_bus *bus);
-extern void usb_bus_put (struct usb_bus *bus);
-
-extern int usb_find_interface_driver (struct usb_device *dev,
+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, pm_message_t msg);
+extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
+#else
+static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
+{
+ return;
+}
+#endif /* CONFIG_PM */
+
/*
* USB device fs stuff
*/
* these are expected to be called from the USB core/hub thread
* with the kernel lock held
*/
-extern void usbfs_add_bus(struct usb_bus *bus);
-extern void usbfs_remove_bus(struct usb_bus *bus);
-extern void usbfs_add_device(struct usb_device *dev);
-extern void usbfs_remove_device(struct usb_device *dev);
-extern void usbfs_update_special (void);
-
+extern void usbfs_update_special(void);
extern int usbfs_init(void);
extern void usbfs_cleanup(void);
#else /* CONFIG_USB_DEVICEFS */
-static inline void usbfs_add_bus(struct usb_bus *bus) {}
-static inline void usbfs_remove_bus(struct usb_bus *bus) {}
-static inline void usbfs_add_device(struct usb_device *dev) {}
-static inline void usbfs_remove_device(struct usb_device *dev) {}
-static inline void usbfs_update_special (void) {}
-
+static inline void usbfs_update_special(void) {}
static inline int usbfs_init(void) { return 0; }
static inline void usbfs_cleanup(void) { }
/*-------------------------------------------------------------------------*/
-#if defined(CONFIG_USB_MON)
+#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
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);
+ void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
/* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
- void (*bus_add)(struct usb_bus *bus);
- void (*bus_remove)(struct usb_bus *bus);
};
extern struct usb_mon_operations *mon_ops;
(*mon_ops->urb_submit_error)(bus, urb, error);
}
-static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb)
+static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
+ int status)
{
if (bus->monitored)
- (*mon_ops->urb_complete)(bus, urb);
-}
-
-static inline void usbmon_notify_bus_add(struct usb_bus *bus)
-{
- if (mon_ops)
- (*mon_ops->bus_add)(bus);
-}
-
-static inline void usbmon_notify_bus_remove(struct usb_bus *bus)
-{
- if (mon_ops)
- (*mon_ops->bus_remove)(bus);
+ (*mon_ops->urb_complete)(bus, urb, status);
}
int usb_mon_register(struct usb_mon_operations *ops);
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) {}
-static inline void usbmon_notify_bus_add(struct usb_bus *bus) {}
-static inline void usbmon_notify_bus_remove(struct usb_bus *bus) {}
+static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
+ int status) {}
-#endif /* CONFIG_USB_MON */
+#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
/*-------------------------------------------------------------------------*/
/* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
-// bleech -- resurfaced in 2.4.11 or 2.4.12
+/* 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"))
+#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;
+/* Keep track of which host controller drivers are loaded */
+#define USB_UHCI_LOADED 0
+#define USB_OHCI_LOADED 1
+#define USB_EHCI_LOADED 2
+extern unsigned long usb_hcds_loaded;
#endif /* __KERNEL__ */
+#endif /* __USB_CORE_HCD_H */
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