// SPDX-License-Identifier: GPL-2.0+
/*
 * 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.
 */

#ifndef __USB_CORE_HCD_H
#define __USB_CORE_HCD_H

#ifdef __KERNEL__

#include <linux/rwsem.h>
#include <linux/interrupt.h>
#include <linux/idr.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_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.
 */

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

struct giveback_urb_bh {
        bool running;
        spinlock_t lock;
        struct list_head  head;
        struct tasklet_struct bh;
        struct usb_host_endpoint *completing_ep;
};

enum usb_dev_authorize_policy {
        USB_DEVICE_AUTHORIZE_NONE       = 0,
        USB_DEVICE_AUTHORIZE_ALL        = 1,
        USB_DEVICE_AUTHORIZE_INTERNAL   = 2,
};

struct usb_hcd {

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

        const char              *product_desc;  /* product/vendor string */
        int                     speed;          /* Speed for this roothub.
                                                 * May be different from
                                                 * hcd->driver->flags & HCD_MASK
                                                 */
        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
        struct work_struct      died_work;      /* for when the device dies */

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

        /*
         * OTG and some Host controllers need software interaction with phys;
         * other external phys should be software-transparent
         */
        struct usb_phy          *usb_phy;
        struct usb_phy_roothub  *phy_roothub;

        /* Flags that need to be manipulated atomically because they can
         * change while the host controller is running.  Always use
         * set_bit() or clear_bit() to change their values.
         */
        unsigned long           flags;
#define HCD_FLAG_HW_ACCESSIBLE          0       /* at full power */
#define HCD_FLAG_POLL_RH                2       /* poll for rh status? */
#define HCD_FLAG_POLL_PENDING           3       /* status has changed? */
#define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
#define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
#define HCD_FLAG_DEAD                   6       /* controller has died? */
#define HCD_FLAG_INTF_AUTHORIZED        7       /* authorize interfaces? */

        /* The flags can be tested using these macros; they are likely to
         * be slightly faster than test_bit().
         */
#define HCD_HW_ACCESSIBLE(hcd)  ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
#define HCD_POLL_RH(hcd)        ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
#define HCD_POLL_PENDING(hcd)   ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
#define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
#define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
#define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))

        /*
         * Specifies if interfaces are authorized by default
         * or they require explicit user space authorization; this bit is
         * settable through /sys/class/usb_host/X/interface_authorized_default
         */
#define HCD_INTF_AUTHORIZED(hcd) \
        ((hcd)->flags & (1U << HCD_FLAG_INTF_AUTHORIZED))

        /*
         * Specifies if devices are authorized by default
         * or they require explicit user space authorization; this bit is
         * settable through /sys/class/usb_host/X/authorized_default
         */
        enum usb_dev_authorize_policy dev_policy;

        /* Flags that get set only during HCD registration or removal. */
        unsigned                rh_registered:1;/* is root hub registered? */
        unsigned                rh_pollable:1;  /* may we poll the root hub? */
        unsigned                msix_enabled:1; /* driver has MSI-X enabled? */
        unsigned                msi_enabled:1;  /* driver has MSI enabled? */
        /*
         * do not manage the PHY state in the HCD core, instead let the driver
         * handle this (for example if the PHY can only be turned on after a
         * specific event)
         */
        unsigned                skip_phy_initialization:1;

        /* 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                wireless:1;     /* Wireless USB HCD */
        unsigned                has_tt:1;       /* Integrated TT in root hub */
        unsigned                amd_resume_bug:1; /* AMD remote wakeup quirk */
        unsigned                can_do_streams:1; /* HC supports streams */
        unsigned                tpl_support:1; /* OTG & EH TPL support */
        unsigned                cant_recv_wakeups:1;
                        /* wakeup requests from downstream aren't received */

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

        struct giveback_urb_bh  high_prio_bh;
        struct giveback_urb_bh  low_prio_bh;

        /* 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            *address0_mutex;
        struct mutex            *bandwidth_mutex;
        struct usb_hcd          *shared_hcd;
        struct usb_hcd          *primary_hcd;


#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)

        /* memory pool for HCs having local memory, or %NULL */
        struct gen_pool         *localmem_pool;

        /* 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[]
                        __attribute__ ((aligned(sizeof(s64))));
};

/* 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 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_DMA         0x0002          /* HC uses DMA */
#define HCD_SHARED      0x0004          /* Two (or more) usb_hcds share HW */
#define HCD_USB11       0x0010          /* USB 1.1 */
#define HCD_USB2        0x0020          /* USB 2.0 */
#define HCD_USB25       0x0030          /* Wireless USB 1.0 (USB 2.5)*/
#define HCD_USB3        0x0040          /* USB 3.0 */
#define HCD_USB31       0x0050          /* USB 3.1 */
#define HCD_USB32       0x0060          /* USB 3.2 */
#define HCD_MASK        0x0070
#define HCD_BH          0x0100          /* URB complete in BH context */

        /* 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, bool do_wakeup);

        /* 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 urb *urb, gfp_t mem_flags);
        int     (*urb_dequeue)(struct usb_hcd *hcd,
                                struct urb *urb, int status);

        /*
         * (optional) these hooks allow an HCD to override the default DMA
         * mapping and unmapping routines.  In general, they shouldn't be
         * necessary unless the host controller has special DMA requirements,
         * such as alignment contraints.  If these are not specified, the
         * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
         * (and it may be a good idea to call these functions in your HCD
         * implementation)
         */
        int     (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
                                   gfp_t mem_flags);
        void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);

        /* 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,
                                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);
        unsigned long   (*get_resuming_ports)(struct usb_hcd *);

                /* 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_disconnect to free HC device structures */
        void    (*free_dev)(struct usb_hcd *, struct usb_device *);
        /* Change a group of bulk endpoints to support multiple stream IDs */
        int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
                struct usb_host_endpoint **eps, unsigned int num_eps,
                unsigned int num_streams, gfp_t mem_flags);
        /* Reverts a group of bulk endpoints back to not using stream IDs.
         * Can fail if we run out of memory.
         */
        int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
                struct usb_host_endpoint **eps, unsigned int num_eps,
                gfp_t mem_flags);

        /* 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);
                /* prepares the hardware to send commands to the device */
        int     (*enable_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);
        int     (*reset_device)(struct usb_hcd *, struct usb_device *);
                /* Notifies the HCD after a device is connected and its
                 * address is set
                 */
        int     (*update_device)(struct usb_hcd *, struct usb_device *);
        int     (*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
        /* USB 3.0 Link Power Management */
                /* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
        int     (*enable_usb3_lpm_timeout)(struct usb_hcd *,
                        struct usb_device *, enum usb3_link_state state);
                /* The xHCI host controller can still fail the command to
                 * disable the LPM timeouts, so this can return an error code.
                 */
        int     (*disable_usb3_lpm_timeout)(struct usb_hcd *,
                        struct usb_device *, enum usb3_link_state state);
        int     (*find_raw_port_number)(struct usb_hcd *, int);
        /* Call for power on/off the port if necessary */
        int     (*port_power)(struct usb_hcd *hcd, int portnum, bool enable);

};

static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
{
        return hcd->driver->flags & HCD_BH;
}

static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
                struct usb_host_endpoint *ep)
{
        return hcd->high_prio_bh.completing_ep == ep;
}

static inline bool hcd_uses_dma(struct usb_hcd *hcd)
{
        return IS_ENABLED(CONFIG_HAS_DMA) && (hcd->driver->flags & HCD_DMA);
}

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 int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
                gfp_t mem_flags);
extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
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);

struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
                struct device *sysdev, struct device *dev, const char *bus_name,
                struct usb_hcd *primary_hcd);
extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
                struct device *dev, const char *bus_name);
extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
                struct device *dev, const char *bus_name,
                struct usb_hcd *shared_hcd);
extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
extern void usb_put_hcd(struct usb_hcd *hcd);
extern int usb_hcd_is_primary_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);
extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
                            dma_addr_t dma, size_t size);

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

#ifdef CONFIG_USB_PCI
struct pci_dev;
struct pci_device_id;
extern int usb_hcd_pci_probe(struct pci_dev *dev,
                             const struct pci_device_id *id,
                             const struct hc_driver *driver);
extern void usb_hcd_pci_remove(struct pci_dev *dev);
extern void usb_hcd_pci_shutdown(struct pci_dev *dev);

extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);

#ifdef CONFIG_PM
extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
#endif
#endif /* CONFIG_USB_PCI */

/* pci-ish (pdev null is ok) buffer alloc/mapping support */
void usb_init_pool_max(void);
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);
extern void usb_wakeup_notification(struct usb_device *hdev,
                unsigned int portnum);

extern void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum);
extern void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum);

/* 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)))

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

/* 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 <linux/usb/ch11.h>

/*
 * As of USB 2.0, full/low speed devices are segregated into trees.
 * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 * The other type grows from high speed hubs when they connect to
 * full/low speed devices using "Transaction Translators" (TTs).
 *
 * TTs should only be known to the hub driver, and high speed bus
 * drivers (only EHCI for now).  They affect periodic scheduling and
 * sometimes control/bulk error recovery.
 */

struct usb_device;

struct usb_tt {
        struct usb_device       *hub;   /* upstream highspeed hub */
        int                     multi;  /* true means one TT per port */
        unsigned                think_time;     /* think time in ns */
        void                    *hcpriv;        /* HCD private data */

        /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
        spinlock_t              lock;
        struct list_head        clear_list;     /* of usb_tt_clear */
        struct work_struct      clear_work;
};

struct usb_tt_clear {
        struct list_head        clear_list;
        unsigned                tt;
        u16                     devinfo;
        struct usb_hcd          *hcd;
        struct usb_host_endpoint        *ep;
};

extern int usb_hub_clear_tt_buffer(struct urb *urb);
extern void usb_ep0_reinit(struct usb_device *);

/* (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_ENDPOINT)<<8)
#define EndpointOutRequest \
        ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT)<<8)

/* class requests from the USB 2.0 hub spec, table 11-15 */
#define HUB_CLASS_REQ(dir, type, request) ((((dir) | (type)) << 8) | (request))
/* GetBusState and SetHubDescriptor are optional, omitted */
#define ClearHubFeature         HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_CLEAR_FEATURE)
#define ClearPortFeature        HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_CLEAR_FEATURE)
#define GetHubDescriptor        HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_DESCRIPTOR)
#define GetHubStatus            HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_STATUS)
#define GetPortStatus           HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, USB_REQ_GET_STATUS)
#define SetHubFeature           HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_SET_FEATURE)
#define SetPortFeature          HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_SET_FEATURE)
#define ClearTTBuffer           HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_CLEAR_TT_BUFFER)
#define ResetTT                 HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_RESET_TT)
#define GetTTState              HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, HUB_GET_TT_STATE)
#define StopTT                  HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_STOP_TT)


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

/* class requests from USB 3.1 hub spec, table 10-7 */
#define SetHubDepth             HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, HUB_SET_DEPTH)
#define GetPortErrorCount       HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, HUB_GET_PORT_ERR_COUNT)

/*
 * 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)    DIV_ROUND_UP(ns, 1000L)
                        /* convert nanoseconds to microseconds, rounding up */

/*
 * 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 idr usb_bus_idr;
extern struct mutex usb_bus_idr_lock;
extern wait_queue_head_t usb_kill_urb_queue;


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

#ifdef CONFIG_PM
extern unsigned usb_wakeup_enabled_descendants(struct usb_device *udev);
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);
extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
#else
static inline unsigned usb_wakeup_enabled_descendants(struct usb_device *udev)
{
        return 0;
}
static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
{
        return;
}
#endif /* CONFIG_PM */

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

#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, int status);
        /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
};

extern const 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(const 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 || CONFIG_USB_MON_MODULE */

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

/* random stuff */

/* 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 */