this commit is a combination of the following changes, which
significantly refactors usb core and class drivers.
1. unify usb buffers of each class driver to reduce iram usage
currently, many class drivers allocate their own buffer to receive
control out data, which is a waste of iram.
share one common buffer for that usage to address the issue.
2. simplify control request handling by implicitly receiving write
request data packets
change 1 above fixed the data destination. therefore, having the core
receive the data allows us to reduce the class driver's work and
simplifies the api.
3. enhance usb core's control request handling and unify the legacy
driver api
in order to implement change 2, both the legacy and new driver apis
should be supported. so that, using the designware driver as a
reference, the new driver api functionality is move into usb core.
this simplifies the usb device drivers by requiring them to implement
only the functionalities equivalent to the legacy api.
tested with ipodvideo(arc) and erosqnative(designware)
Change-Id: I3627daa90278751f599e2108ec150ec3f8f6c524
add needs_cpu_boost field to usb_class_driver and manage boost state in
usb_core, similar to needs_exclusive_storage.
Change-Id: Ieb0cd7bedda5b24bb0d209d5ce907db30f4815db
this is required to make hid endpoint of iap class driver work,
especially on ipodvideo(arc).
at least for arc, it is required to set mps as 64 instead of 512 on
highspeed, or some accessories ignore incoming hid reports.
Change-Id: I242060faced28a66204146a9c36ef10626d6d265
add class driver source files.
also register iap audio sink.
usbstack/iap/libiap directory is imported from libiap.
Change-Id: I776c5caec33fe9efadc448e2e3b37d500bf19c9f
