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-The U-Boot Driver Model Project
-===============================
-USB analysis
-============
-Marek Vasut <marek.vasut@gmail.com>
-2012-02-16
-
-I) Overview
------------
-
-  1) The USB Host driver
-  ----------------------
-  There are basically four or five USB host drivers. All such drivers currently
-  provide at least the following fuctions:
-
-    usb_lowlevel_init() ... Do the initialization of the USB controller hardware
-    usb_lowlevel_stop() ... Do the shutdown of the USB controller hardware
-
-    usb_event_poll() ...... Poll interrupt from USB device, often used by KBD
-
-    submit_control_msg() .. Submit message via Control endpoint
-    submit_int_msg() ...... Submit message via Interrupt endpoint
-    submit_bulk_msg() ..... Submit message via Bulk endpoint
-
-
-    This allows for the host driver to be easily abstracted.
-
-  2) The USB hierarchy
-  --------------------
-
-  In the current implementation, the USB Host driver provides operations to
-  communicate via the USB bus. This is realised by providing access to a USB
-  root port to which an USB root hub is attached. The USB bus is scanned and for
-  each newly found device, a struct usb_device is allocated. See common/usb.c
-  and include/usb.h for details.
-
-II) Approach
-------------
-
-  1) The USB Host driver
-  ----------------------
-
-  Converting the host driver will follow the classic driver model consideration.
-  Though, the host driver will have to call a function that registers a root
-  port with the USB core in it's probe() function, let's call this function
-
-    usb_register_root_port(&ops);
-
-  This will allow the USB core to track all available root ports. The ops
-  parameter will contain structure describing operations supported by the root
-  port:
-
-  struct usb_port_ops {
-    void   (*usb_event_poll)();
-    int    (*submit_control_msg)();
-    int    (*submit_int_msg)();
-    int    (*submit_bulk_msg)();
-  }
-
-  2) The USB hierarchy and hub drivers
-  ------------------------------------
-
-  Converting the USB heirarchy should be fairy simple, considering the already
-  dynamic nature of the implementation. The current usb_hub_device structure
-  will have to be converted to a struct instance. Every such instance will
-  contain components of struct usb_device and struct usb_hub_device in it's
-  private data, providing only accessors in order to properly encapsulate the
-  driver.
-
-  By registering the root port, the USB framework will instantiate a USB hub
-  driver, which is always present, the root hub. The root hub and any subsequent
-  hub instance is represented by struct instance and it's private data contain
-  amongst others common bits from struct usb_device.
-
-  Note the USB hub driver is partly defying the usual method of registering a
-  set of callbacks to a particular core driver. Instead, a static set of
-  functions is defined and the USB hub instance is passed to those. This creates
-  certain restrictions as of how the USB hub driver looks, but considering the
-  specification for USB hub is given and a different type of USB hub won't ever
-  exist, this approach is ok:
-
-  - Report how many ports does this hub have:
-      uint get_nr_ports(struct instance *hub);
-  - Get pointer to device connected to a port:
-      struct instance *(*get_child)(struct instance *hub, int port);
-  - Instantiate and configure device on port:
-      struct instance *(*enum_dev_on_port)(struct instance *hub, int port);
-
-  3) USB device drivers
-  ---------------------
-
-  The USB device driver, in turn, will have to register various ops structures
-  with certain cores. For example, USB disc driver will have to register it's
-  ops with core handling USB discs etc.