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dmaengine: mediatek: Add MediaTek UART APDMA support

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Add 8250 UART APDMA to support MediaTek UART. If MediaTek UART is
enabled by SERIAL_8250_MT6577, and we can enable this driver to offload
the UART device moving bytes.

Signed-off-by: Long Cheng <long.cheng@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Long Cheng
2019-04-27 11:36:30 +08:00
committed by Vinod Koul
parent 2fe5575f36
commit 9135408c3a
3 changed files with 678 additions and 0 deletions
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11
drivers/dma/mediatek/Kconfig
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@@ -24,3 +24,14 @@ config MTK_CQDMA
This controller provides the channels which is dedicated to
memory-to-memory transfer to offload from CPU.
config MTK_UART_APDMA
tristate "MediaTek SoCs APDMA support for UART"
depends on OF && SERIAL_8250_MT6577
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
help
Support for the UART DMA engine found on MediaTek MTK SoCs.
When SERIAL_8250_MT6577 is enabled, and if you want to use DMA,
you can enable the config. The DMA engine can only be used
with MediaTek SoCs.

1
drivers/dma/mediatek/Makefile
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@@ -1,2 +1,3 @@
obj-$(CONFIG_MTK_UART_APDMA) += mtk-uart-apdma.o
obj-$(CONFIG_MTK_HSDMA) += mtk-hsdma.o
obj-$(CONFIG_MTK_CQDMA) += mtk-cqdma.o

666
drivers/dma/mediatek/mtk-uart-apdma.c Normal file
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