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/*

 * Copyright (c) 2001 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.

 */

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

/*

 * 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 usb_hcd {        /* usb_bus.hcpriv points to this */

        /*

         * housekeeping

         */

        struct usb_bus          *bus;           /* hcd is-a bus */

        struct list_head        hcd_list;

        const char              *product_desc;

        const char              *description;   /* "ehci-hcd" etc */

        struct timer_list       rh_timer;       /* drives root hub */

        struct list_head        dev_list;       /* devices on this bus */

        struct tq_struct        work;

        /*

         * hardware info/state

         */

        struct hc_driver        *driver;        /* hw-specific hooks */

        int                     irq;            /* irq allocated */

        void                    *regs;          /* device memory/io */

#ifdef  CONFIG_PCI

        /* a few non-PCI controllers exist, mostly for OHCI */

        struct pci_dev          *pdev;          /* pci is typical */

        int                     region;         /* pci region for regs */

        u32                     pci_state [16]; /* for PM state save */

        atomic_t                resume_count;   /* multiple resumes issue */

#endif

        int                     state;

#       define  __ACTIVE                0x01

#       define  __SLEEPY                0x02

#       define  __SUSPEND               0x04

#       define  __TRANSIENT             0x80

#       define  USB_STATE_HALT          0

#       define  USB_STATE_RUNNING       (__ACTIVE)

#       define  USB_STATE_READY         (__ACTIVE|__SLEEPY)

#       define  USB_STATE_QUIESCING     (__SUSPEND|__TRANSIENT|__ACTIVE)

#       define  USB_STATE_RESUMING      (__SUSPEND|__TRANSIENT)

#       define  USB_STATE_SUSPENDED     (__SUSPEND)

#define HCD_IS_RUNNING(state) ((state) & __ACTIVE)

#define HCD_IS_SUSPENDED(state) ((state) & __SUSPEND)

        /* more shared queuing code would be good; it should support

         * smarter scheduling, handle transaction translators, etc;

         * input size of periodic table to an interrupt scheduler.

         * (ohci 32, uhci 1024, ehci 256/512/1024).

         */

};

struct hcd_dev {        /* usb_device.hcpriv points to this */

        struct list_head        dev_list;       /* on this hcd */

        struct list_head        urb_list;       /* pending on this dev */

        /* per-configuration HC/HCD state, such as QH or ED */

        void                    *ep[32];

};

// urb.hcpriv is really hardware-specific

struct hcd_timeout {    /* timeouts we allocate */

        struct list_head        timeout_list;

        struct timer_list       timer;

};

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

/* each driver provides one of these, and hardware init support */

struct hc_driver {

        const char      *description;   /* "ehci-hcd" etc */

        /* irq handler */

        void    (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);

        int     flags;

#define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */

#define HCD_USB11       0x0010          /* USB 1.1 */

#define HCD_USB2        0x0020          /* USB 2.0 */

        /* called to init HCD and root hub */

        int     (*start) (struct usb_hcd *hcd);

        /* called after all devices were suspended */

        int     (*suspend) (struct usb_hcd *hcd, u32 state);

        /* called before any devices get resumed */

        int     (*resume) (struct usb_hcd *hcd);

        /* cleanly make HCD stop writing memory and doing I/O */

        void    (*stop) (struct usb_hcd *hcd);

        /* return current frame number */

        int     (*get_frame_number) (struct usb_hcd *hcd);

// FIXME: rework generic-to-specific HCD linkage (specific contains generic)

        /* memory lifecycle */

        struct usb_hcd  *(*hcd_alloc) (void);

        void            (*hcd_free) (struct usb_hcd *hcd);

        /* manage i/o requests, device state */

        int     (*urb_enqueue) (struct usb_hcd *hcd, struct urb *urb,

                                        int mem_flags);

        int     (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);

        // frees configuration resources -- allocated as needed during

        // urb_enqueue, and not freed by urb_dequeue

        void            (*free_config) (struct usb_hcd *hcd,

                                struct usb_device *dev);

        /* 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);

};

extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb,

                struct pt_regs *regs);

#ifdef CONFIG_PCI

struct pci_device_id;

extern int usb_hcd_pci_probe (struct pci_dev *dev,

                                const struct pci_device_id *id);

extern void usb_hcd_pci_remove (struct pci_dev *dev);

#ifdef CONFIG_PM

// FIXME:  see Documentation/power/pci.txt (2.4.6 and later?)

// extern int usb_hcd_pci_save_state (struct pci_dev *dev, u32 state);

extern int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state);

extern int usb_hcd_pci_resume (struct pci_dev *dev);

// extern int usb_hcd_pci_enable_wake (struct pci_dev *dev, u32 state, int flg);

#endif /* CONFIG_PM */

#endif /* CONFIG_PCI */

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

/*

 * HCD Root Hub support

 */

#include "hub.h"

/* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */

#define DeviceRequest \

        ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)

#define DeviceOutRequest \

        ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)

#define InterfaceRequest \

        ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)

#define EndpointRequest \

        ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)

#define EndpointOutRequest \

        ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)

/* table 9.6 standard features */

#define DEVICE_REMOTE_WAKEUP    1

#define ENDPOINT_HALT           0

/* class requests from the USB 2.0 hub spec, table 11-15 */

/* GetBusState and SetHubDescriptor are optional, omitted */

#define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)

#define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)

#define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)

#define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)

#define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)

#define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)

#define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)

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

/*

 * Generic bandwidth allocation constants/support

 */

#define FRAME_TIME_USECS        1000L

#define BitTime(bytecount)  (7 * 8 * bytecount / 6)  /* with integer truncation */

                /* Trying not to use worst-case bit-stuffing

                   of (7/6 * 8 * bytecount) = 9.33 * bytecount */

                /* bytecount = data payload byte count */

#define NS_TO_US(ns)    ((ns + 500L) / 1000L)

                        /* convert & round nanoseconds to microseconds */

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.) */

#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

 * 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) \

        + USB2_HOST_DELAY)

#define HS_USECS_ISO(bytes) NS_TO_US ( ((long)(38 * 8 * 2.083)) \

        + ((2083UL * (3167 + BitTime (bytes)))/1000) \

        + USB2_HOST_DELAY)

extern long usb_calc_bus_time (int speed, int is_input,

                        int isoc, int bytecount);

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

/* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */

// bleech -- resurfaced in 2.4.11 or 2.4.12

#define bitmap  DeviceRemovable

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

/* random stuff */

#define RUN_CONTEXT (in_irq () ? "in_irq" \

                : (in_interrupt () ? "in_interrupt" : "can sleep"))

/* 2.5 changes ... */

#ifndef container_of

#define container_of    list_entry

#endif

#define usb_get_urb(x) (x)

#define usb_put_urb(x)

static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)

        { return hcd->bus; }

static inline void

usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe)

        { }

#define URB_ZERO_PACKET USB_ZERO_PACKET

#define URB_ISO_ASAP    USB_ISO_ASAP