linux/drivers/usb
Andiry Xu 04e51901dd USB: xHCI: Isochronous transfer implementation
This patch implements isochronous urb enqueue and interrupt handler part.

When an isochronous urb is passed to xHCI driver, first check the transfer
ring to guarantee there is enough room for the whole urb. Then update the
start_frame and interval field of the urb. Always assume URB_ISO_ASAP
is set, and never use urb->start_frame as input.

The number of isoc TDs is equal to urb->number_of_packets. One isoc TD is
consumed every Interval. Each isoc TD consists of an Isoch TRB chained to
zero or more Normal TRBs.

Call prepare_transfer for each TD to do initialization; then calculate the
number of TRBs needed for each TD. If the data required by an isoc TD is
physically contiguous (not crosses a page boundary), then only one isoc TRB
is needed; otherwise one or more additional normal TRB shall be chained to
the isoc TRB by the host.

Set TRB_IOC to the last TRB of each isoc TD. Do not ring endpoint doorbell
to start xHC procession until all the TDs are inserted to the endpoint
transer ring.

In irq handler, update urb status and actual_length, increase
urb_priv->td_cnt. When all the TDs are completed(td_cnt is equal to
urb_priv->length), giveback the urb to usbcore.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10 14:35:41 -07:00
..
atm usb: atm: fixed spacing and indentation coding style issues 2010-08-10 14:35:35 -07:00
c67x00 USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
class USB: usblp: fixed switch, brace, whitespace and spacing coding style issues 2010-08-10 14:35:38 -07:00
core USB delay init quirk for logitech Harmony 700-series devices 2010-08-10 14:35:41 -07:00
early echi-dbgp: Add kernel debugger support for the usb debug port 2010-05-20 21:04:31 -05:00
gadget USB: gadget: functionfs: stale Makefile entry removed 2010-08-10 14:35:40 -07:00
host USB: xHCI: Isochronous transfer implementation 2010-08-10 14:35:41 -07:00
image USB: BKL removal: mdc800 2010-03-02 14:54:27 -08:00
misc USB: misc: Remove unnecessary casts of private_data 2010-08-10 14:35:39 -07:00
mon USB: resizing usbmon binary interface buffer causes protection faults 2010-08-10 14:35:41 -07:00
musb USB: musb: forward debug mode feature to gadget 2010-08-10 14:35:39 -07:00
otg USB: otg/ulpi: extend the generic ulpi driver. 2010-08-10 14:35:40 -07:00
serial USB: option: Huawei ETS 1220 support added 2010-08-10 14:35:41 -07:00
storage usb: storage: freecom: Fixed several coding style issues. 2010-08-10 14:35:39 -07:00
wusbcore fix typos concerning "initiali[zs]e" 2010-06-16 18:05:05 +02:00
Kconfig USB: Add JZ4740 OHCI support 2010-08-05 13:26:19 +01:00
Makefile USB: drivers/usb/Makefile: conditionally descend to 'early' 2010-08-10 14:35:38 -07:00
README
usb-skeleton.c USB: usb-skeleton: Remove unnecessary casts of private_data 2010-08-10 14:35:39 -07:00

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("khubd").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.