tree 955a73509a5745ee4e7a71fa42f10c0c57632aa5
parent 7056d423f16103f6700569f60ca842d91bfaabab
author Colin Cross <ccross@android.com> 1270498602 -0700
committer Colin Cross <ccross@android.com> 1287709955 -0700

[ARM] tegra: Add APB DMA support

The APB DMA block handles DMA transfers to and from some peripherals
in the Tegra SOC.  It reads from sequential addresses on the memory
bus, and writes repeatedly to the same address on the APB bus.

Two transfer modes are supported, oneshot for transferring a known
size to or from a peripheral, and continuous for streaming data.
In continuous mode, a callback occurs when the buffer is half full
to allow the existing data to be handled and a new request queued.x

v2 changes:
	dma API no longer uses PTR_ERR

Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Colin Cross <ccross@android.com>