dmaengine: uniphier-xdmac: Add UniPhier external DMA controller driver
This adds external DMA controller driver implemented in Socionext
UniPhier SoCs. This driver supports DMA_MEMCPY and DMA_SLAVE modes.
Since this driver does not support the the way to transfer size
unaligned to burst width, 'src_maxburst' or 'dst_maxburst' of
dma_slave_config must be 1 to transfer arbitrary size. If transfer
size is unaligned to burst size, the transfer isn't started and
the driver displays an error message.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1582271550-3403-3-git-send-email-hayashi.kunihiko@socionext.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 7fc725d..0924836 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -658,6 +658,17 @@
UniPhier platform. This DMA controller is used as the external
DMA engine of the SD/eMMC controllers of the LD4, Pro4, sLD8 SoCs.
+config UNIPHIER_XDMAC
+ tristate "UniPhier XDMAC support"
+ depends on ARCH_UNIPHIER || COMPILE_TEST
+ depends on OF
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for the XDMAC (external DMA controller) on the
+ UniPhier platform. This DMA controller can transfer data from
+ memory to memory, memory to peripheral and peripheral to memory.
+
config XGENE_DMA
tristate "APM X-Gene DMA support"
depends on ARCH_XGENE || COMPILE_TEST
