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This adds a new transmission implementation for the multi UART driver. It is a DMA based transmitter that can directly read from the TX queue with zero copy overhead. The DMA channel used as well as the maximum DMA transmission size are configurable per UART at the board level. This also updates the Ryu AP UART to use DMA transmission. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Manually verify that the AP UART forwarding works Change-Id: I3cb27d0f9015043d75a38c12919388afe90dc4af Reviewed-on: https://chromium-review.googlesource.com/286274 Trybot-Ready: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit