MediaTek High-Speed DMA controller support

modulename: hsdma-mt7621.ko

and/or

mtk-hsdma.ko

configname: CONFIG_MTK_HSDMA

Linux Kernel Configuration
└─>Device Drivers
└─>DMA Engine support
└─>MediaTek High-Speed DMA controller support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Enable support for High-Speed DMA controller on MediaTek
SoCs.

This controller provides the channels which is dedicated to
memory-to-memory transfer to offload from CPU through ring-
based descriptor management.

source code: