485 lines
15 KiB
C
485 lines
15 KiB
C
/*
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* Copyright (c) 2001-2002 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef __KERNEL__
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/* This file contains declarations of usbcore internals that are mostly
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* used or exposed by Host Controller Drivers.
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*/
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/*
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* USB Packet IDs (PIDs)
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*/
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#define USB_PID_UNDEF_0 0xf0
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#define USB_PID_OUT 0xe1
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#define USB_PID_ACK 0xd2
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#define USB_PID_DATA0 0xc3
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#define USB_PID_PING 0xb4 /* USB 2.0 */
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#define USB_PID_SOF 0xa5
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#define USB_PID_NYET 0x96 /* USB 2.0 */
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#define USB_PID_DATA2 0x87 /* USB 2.0 */
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#define USB_PID_SPLIT 0x78 /* USB 2.0 */
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#define USB_PID_IN 0x69
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#define USB_PID_NAK 0x5a
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#define USB_PID_DATA1 0x4b
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#define USB_PID_PREAMBLE 0x3c /* Token mode */
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#define USB_PID_ERR 0x3c /* USB 2.0: handshake mode */
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#define USB_PID_SETUP 0x2d
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#define USB_PID_STALL 0x1e
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#define USB_PID_MDATA 0x0f /* USB 2.0 */
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/*-------------------------------------------------------------------------*/
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/*
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* USB Host Controller Driver (usb_hcd) framework
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*
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* Since "struct usb_bus" is so thin, you can't share much code in it.
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* This framework is a layer over that, and should be more sharable.
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*/
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/*-------------------------------------------------------------------------*/
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struct usb_hcd { /* usb_bus.hcpriv points to this */
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/*
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* housekeeping
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*/
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struct usb_bus self; /* hcd is-a bus */
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const char *product_desc; /* product/vendor string */
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char irq_descr[24]; /* driver + bus # */
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struct timer_list rh_timer; /* drives root-hub polling */
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struct urb *status_urb; /* the current status urb */
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/*
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* hardware info/state
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*/
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const struct hc_driver *driver; /* hw-specific hooks */
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unsigned saw_irq : 1;
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unsigned can_wakeup:1; /* hw supports wakeup? */
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unsigned remote_wakeup:1;/* sw should use wakeup? */
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unsigned rh_registered:1;/* is root hub registered? */
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/* The next flag is a stopgap, to be removed when all the HCDs
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* support the new root-hub polling mechanism. */
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unsigned uses_new_polling:1;
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unsigned poll_rh:1; /* poll for rh status? */
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unsigned poll_pending:1; /* status has changed? */
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int irq; /* irq allocated */
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void __iomem *regs; /* device memory/io */
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u64 rsrc_start; /* memory/io resource start */
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u64 rsrc_len; /* memory/io resource length */
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unsigned power_budget; /* in mA, 0 = no limit */
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#define HCD_BUFFER_POOLS 4
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struct dma_pool *pool [HCD_BUFFER_POOLS];
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int state;
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# define __ACTIVE 0x01
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# define __SUSPEND 0x04
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# define __TRANSIENT 0x80
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# define HC_STATE_HALT 0
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# define HC_STATE_RUNNING (__ACTIVE)
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# define HC_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
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# define HC_STATE_RESUMING (__SUSPEND|__TRANSIENT)
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# define HC_STATE_SUSPENDED (__SUSPEND)
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#define HC_IS_RUNNING(state) ((state) & __ACTIVE)
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#define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
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/* more shared queuing code would be good; it should support
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* smarter scheduling, handle transaction translators, etc;
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* input size of periodic table to an interrupt scheduler.
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* (ohci 32, uhci 1024, ehci 256/512/1024).
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*/
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/* The HC driver's private data is stored at the end of
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* this structure.
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*/
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unsigned long hcd_priv[0]
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__attribute__ ((aligned (sizeof(unsigned long))));
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};
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/* 2.4 does this a bit differently ... */
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static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
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{
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return &hcd->self;
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}
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// urb.hcpriv is really hardware-specific
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struct hcd_timeout { /* timeouts we allocate */
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struct list_head timeout_list;
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struct timer_list timer;
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};
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/*-------------------------------------------------------------------------*/
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/*
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* FIXME usb_operations should vanish or become hc_driver,
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* when usb_bus and usb_hcd become the same thing.
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*/
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struct usb_operations {
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int (*get_frame_number) (struct usb_device *usb_dev);
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int (*submit_urb) (struct urb *urb, gfp_t mem_flags);
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int (*unlink_urb) (struct urb *urb, int status);
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/* allocate dma-consistent buffer for URB_DMA_NOMAPPING */
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void *(*buffer_alloc)(struct usb_bus *bus, size_t size,
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gfp_t mem_flags,
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dma_addr_t *dma);
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void (*buffer_free)(struct usb_bus *bus, size_t size,
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void *addr, dma_addr_t dma);
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void (*disable)(struct usb_device *udev,
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struct usb_host_endpoint *ep);
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};
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/* each driver provides one of these, and hardware init support */
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struct pt_regs;
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struct hc_driver {
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const char *description; /* "ehci-hcd" etc */
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const char *product_desc; /* product/vendor string */
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size_t hcd_priv_size; /* size of private data */
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/* irq handler */
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irqreturn_t (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
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int flags;
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#define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
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#define HCD_USB11 0x0010 /* USB 1.1 */
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#define HCD_USB2 0x0020 /* USB 2.0 */
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/* called to init HCD and root hub */
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int (*reset) (struct usb_hcd *hcd);
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int (*start) (struct usb_hcd *hcd);
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/* NOTE: these suspend/resume calls relate to the HC as
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* a whole, not just the root hub; they're for PCI bus glue.
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*/
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/* called after suspending the hub, before entering D3 etc */
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int (*suspend) (struct usb_hcd *hcd, pm_message_t message);
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/* called after entering D0 (etc), before resuming the hub */
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int (*resume) (struct usb_hcd *hcd);
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/* cleanly make HCD stop writing memory and doing I/O */
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void (*stop) (struct usb_hcd *hcd);
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/* return current frame number */
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int (*get_frame_number) (struct usb_hcd *hcd);
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/* manage i/o requests, device state */
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int (*urb_enqueue) (struct usb_hcd *hcd,
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struct usb_host_endpoint *ep,
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struct urb *urb,
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gfp_t mem_flags);
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int (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
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/* hw synch, freeing endpoint resources that urb_dequeue can't */
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void (*endpoint_disable)(struct usb_hcd *hcd,
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struct usb_host_endpoint *ep);
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/* root hub support */
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int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
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int (*hub_control) (struct usb_hcd *hcd,
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u16 typeReq, u16 wValue, u16 wIndex,
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char *buf, u16 wLength);
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int (*bus_suspend)(struct usb_hcd *);
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int (*bus_resume)(struct usb_hcd *);
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int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
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void (*hub_irq_enable)(struct usb_hcd *);
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/* Needed only if port-change IRQs are level-triggered */
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};
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extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs);
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extern struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
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struct device *dev, char *bus_name);
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extern void usb_put_hcd (struct usb_hcd *hcd);
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extern int usb_add_hcd(struct usb_hcd *hcd,
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unsigned int irqnum, unsigned long irqflags);
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extern void usb_remove_hcd(struct usb_hcd *hcd);
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#ifdef CONFIG_PCI
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struct pci_dev;
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struct pci_device_id;
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extern int usb_hcd_pci_probe (struct pci_dev *dev,
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const struct pci_device_id *id);
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extern void usb_hcd_pci_remove (struct pci_dev *dev);
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#ifdef CONFIG_PM
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extern int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t state);
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extern int usb_hcd_pci_resume (struct pci_dev *dev);
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#endif /* CONFIG_PM */
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#endif /* CONFIG_PCI */
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/* pci-ish (pdev null is ok) buffer alloc/mapping support */
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int hcd_buffer_create (struct usb_hcd *hcd);
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void hcd_buffer_destroy (struct usb_hcd *hcd);
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void *hcd_buffer_alloc (struct usb_bus *bus, size_t size,
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gfp_t mem_flags, dma_addr_t *dma);
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void hcd_buffer_free (struct usb_bus *bus, size_t size,
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void *addr, dma_addr_t dma);
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/* generic bus glue, needed for host controllers that don't use PCI */
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extern irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs *r);
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extern void usb_hc_died (struct usb_hcd *hcd);
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extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
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/* -------------------------------------------------------------------------- */
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/* Enumeration is only for the hub driver, or HCD virtual root hubs */
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extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
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struct usb_bus *, unsigned port);
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extern int usb_new_device(struct usb_device *dev);
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extern void usb_disconnect(struct usb_device **);
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extern int usb_get_configuration(struct usb_device *dev);
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extern void usb_destroy_configuration(struct usb_device *dev);
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/*-------------------------------------------------------------------------*/
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/*
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* HCD Root Hub support
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*/
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#include "hub.h"
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/* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
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#define DeviceRequest \
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((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
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#define DeviceOutRequest \
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((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
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#define InterfaceRequest \
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((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
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#define EndpointRequest \
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((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
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#define EndpointOutRequest \
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((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
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/* class requests from the USB 2.0 hub spec, table 11-15 */
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/* GetBusState and SetHubDescriptor are optional, omitted */
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#define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
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#define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
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#define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
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#define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
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#define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
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#define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
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#define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
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/*-------------------------------------------------------------------------*/
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/*
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* Generic bandwidth allocation constants/support
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*/
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#define FRAME_TIME_USECS 1000L
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#define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
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/* Trying not to use worst-case bit-stuffing
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of (7/6 * 8 * bytecount) = 9.33 * bytecount */
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/* bytecount = data payload byte count */
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#define NS_TO_US(ns) ((ns + 500L) / 1000L)
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/* convert & round nanoseconds to microseconds */
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extern void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb,
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int bustime, int isoc);
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extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
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int isoc);
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/*
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* Full/low speed bandwidth allocation constants/support.
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*/
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#define BW_HOST_DELAY 1000L /* nanoseconds */
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#define BW_HUB_LS_SETUP 333L /* nanoseconds */
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/* 4 full-speed bit times (est.) */
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#define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
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#define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
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#define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
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extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
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/*
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* Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
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* ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
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* to preallocate bandwidth)
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*/
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#define USB2_HOST_DELAY 5 /* nsec, guess */
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#define HS_NSECS(bytes) ( ((55 * 8 * 2083) \
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+ (2083UL * (3 + BitTime(bytes))))/1000 \
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+ USB2_HOST_DELAY)
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#define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083) \
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+ (2083UL * (3 + BitTime(bytes))))/1000 \
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+ USB2_HOST_DELAY)
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#define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
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#define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))
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extern long usb_calc_bus_time (int speed, int is_input,
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int isoc, int bytecount);
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/*-------------------------------------------------------------------------*/
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extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
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extern void usb_set_device_state(struct usb_device *udev,
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enum usb_device_state new_state);
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/*-------------------------------------------------------------------------*/
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/* exported only within usbcore */
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extern struct list_head usb_bus_list;
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extern struct semaphore usb_bus_list_lock;
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extern wait_queue_head_t usb_kill_urb_queue;
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extern struct usb_bus *usb_bus_get (struct usb_bus *bus);
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extern void usb_bus_put (struct usb_bus *bus);
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extern void usb_enable_root_hub_irq (struct usb_bus *bus);
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extern int usb_find_interface_driver (struct usb_device *dev,
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struct usb_interface *interface);
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#define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
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#ifdef CONFIG_PM
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extern void usb_hcd_suspend_root_hub (struct usb_hcd *hcd);
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extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
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extern int hcd_bus_suspend (struct usb_bus *bus);
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extern int hcd_bus_resume (struct usb_bus *bus);
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#else
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static inline void usb_hcd_suspend_root_hub(struct usb_hcd *hcd)
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{
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return;
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}
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static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
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{
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return;
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}
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static inline int hcd_bus_suspend(struct usb_bus *bus)
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{
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return 0;
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}
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static inline int hcd_bus_resume (struct usb_bus *bus)
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{
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return 0;
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}
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#endif /* CONFIG_PM */
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/*
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* USB device fs stuff
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*/
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#ifdef CONFIG_USB_DEVICEFS
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/*
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* these are expected to be called from the USB core/hub thread
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* with the kernel lock held
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*/
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extern void usbfs_update_special (void);
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extern int usbfs_init(void);
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extern void usbfs_cleanup(void);
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#else /* CONFIG_USB_DEVICEFS */
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static inline void usbfs_update_special (void) {}
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static inline int usbfs_init(void) { return 0; }
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static inline void usbfs_cleanup(void) { }
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#endif /* CONFIG_USB_DEVICEFS */
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/*-------------------------------------------------------------------------*/
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#if defined(CONFIG_USB_MON)
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struct usb_mon_operations {
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void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
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void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
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void (*urb_complete)(struct usb_bus *bus, struct urb *urb);
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/* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
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};
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extern struct usb_mon_operations *mon_ops;
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static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
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{
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if (bus->monitored)
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(*mon_ops->urb_submit)(bus, urb);
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}
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static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
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int error)
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{
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if (bus->monitored)
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(*mon_ops->urb_submit_error)(bus, urb, error);
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}
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static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb)
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{
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if (bus->monitored)
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(*mon_ops->urb_complete)(bus, urb);
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}
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int usb_mon_register(struct usb_mon_operations *ops);
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void usb_mon_deregister(void);
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#else
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static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
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static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
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int error) {}
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static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb) {}
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#endif /* CONFIG_USB_MON */
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/*-------------------------------------------------------------------------*/
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/* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
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// bleech -- resurfaced in 2.4.11 or 2.4.12
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#define bitmap DeviceRemovable
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/*-------------------------------------------------------------------------*/
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/* random stuff */
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#define RUN_CONTEXT (in_irq () ? "in_irq" \
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: (in_interrupt () ? "in_interrupt" : "can sleep"))
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#endif /* __KERNEL__ */
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