Oleksandr Tymoshenko c3a0f75a9f Add hooks for plugging platform-provided transfer backend.
In order to use platorm backend hardware driver should
impement three methods:
- platform_start_transfer and platform_finish_transfer
    to start and finish transfer
- platform_will_handle - check whether transaction is
    suitable for backend. If not - driver will fall back
    to PIO mode.

Submitted by:	Daisuke Aoyama <aoyama at peach.ne.jp>
Approved by:	ian@
2013-02-28 19:43:14 +00:00
..
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