NVIDIA Tegra20/30 SoC's have AHB DMA controller. It has 4 DMA channels, supports AHB <-> Memory and Memory <-> Memory transfers, slave / master modes. This driver is primarily supposed to be used by gpu/host1x in a master mode, performing 3D HW context stores.
Dmitry Osipenko (5): clk: tegra: Add AHB DMA clock entry clk: tegra: Bump SCLK clock rate to 216MHz on Tegra20 dt-bindings: Add DT bindings for NVIDIA Tegra AHB DMA controller dmaengine: Add driver for NVIDIA Tegra AHB DMA controller ARM: dts: tegra: Add AHB DMA controller nodes .../bindings/dma/nvidia,tegra20-ahbdma.txt | 23 + arch/arm/boot/dts/tegra20.dtsi | 9 + arch/arm/boot/dts/tegra30.dtsi | 9 + drivers/clk/tegra/clk-id.h | 1 + drivers/clk/tegra/clk-tegra-periph.c | 1 + drivers/clk/tegra/clk-tegra20.c | 8 +- drivers/clk/tegra/clk-tegra30.c | 2 + drivers/dma/Kconfig | 9 + drivers/dma/Makefile | 1 + drivers/dma/tegra20-ahb-dma.c | 679 +++++++++++++++++++++ 10 files changed, 741 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra20-ahbdma.txt create mode 100644 drivers/dma/tegra20-ahb-dma.c -- 2.14.1
