dmaengine: rcar-dmac: Add Renesas R-Car Gen2 DMA Controller (DMAC) driver
The DMAC is a general purpose multi-channel DMA controller that supports
both slave and memcpy transfers.
The driver currently supports the DMAC found in the r8a7790 and r8a7791
SoCs. Support for compatible DMA controllers (such as the audio DMAC)
will be added later.
Feature-wise, automatic hardware handling of descriptors chains isn't
supported yet. LPAE support is implemented.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig
index 0349125..8190ad2 100644
--- a/drivers/dma/sh/Kconfig
+++ b/drivers/dma/sh/Kconfig
@@ -2,6 +2,10 @@
# DMA engine configuration for sh
#
+config RENESAS_DMA
+ bool
+ select DMA_ENGINE
+
#
# DMA Engine Helpers
#
@@ -12,7 +16,7 @@
depends on !SUPERH || SH_DMA
depends on !SH_DMA_API
default y
- select DMA_ENGINE
+ select RENESAS_DMA
help
Enable support for the Renesas SuperH DMA controllers.
@@ -52,3 +56,11 @@
depends on SH_DMAE_BASE
help
Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers.
+
+config RCAR_DMAC
+ tristate "Renesas R-Car Gen2 DMA Controller"
+ depends on ARCH_SHMOBILE || COMPILE_TEST
+ select RENESAS_DMA
+ help
+ This driver supports the general purpose DMA controller found in the
+ Renesas R-Car second generation SoCs.