hcd.h
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上传日期:2013-04-10
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文件大小:9k
- /*
- * 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 *bus_name;
- 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 */
- /*
- * 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);
- 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);
- #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)
- { }