On Tue, Mar 14, 2023 at 10:18:15AM +0800, Chia-Wei Wang wrote: > Aspeed AST2600 UART DMA (UDMA) includes 14 channels for the > DMA transmission and recevie of each UART devices. > > Signed-off-by: Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx> > --- > drivers/dma/Kconfig | 9 + > drivers/dma/Makefile | 1 + > drivers/dma/ast2600-udma.c | 528 +++++++++++++++++++++++++++++++++++++ > 3 files changed, 538 insertions(+) > create mode 100644 drivers/dma/ast2600-udma.c > > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index fb7073fc034f..c35f87dbafd9 100644 > --- a/drivers/dma/Kconfig > +++ b/drivers/dma/Kconfig > @@ -748,6 +748,15 @@ config XILINX_ZYNQMP_DPDMA > driver provides the dmaengine required by the DisplayPort subsystem > display driver. > > +config ASPEED_AST2600_UDMA > + bool "Aspeed AST2600 UDMA support" > + depends on ARCH_ASPEED || COMPILE_TEST > + help > + Enable support for Aspeed AST2600 UART DMA. Select this option if you > + have a AST2600 SoC integrated system. The driver provides the UART DMA > + support with the dmaengine subsystem, which can be leveraged by generic > + 8250 serial drivers. > + > # driver files > source "drivers/dma/bestcomm/Kconfig" > > diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile > index a4fd1ce29510..6cbacebcdcab 100644 > --- a/drivers/dma/Makefile > +++ b/drivers/dma/Makefile > @@ -81,6 +81,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o > obj-$(CONFIG_ST_FDMA) += st_fdma.o > obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/ > obj-$(CONFIG_INTEL_LDMA) += lgm/ > +obj-$(CONFIG_ASPEED_AST2600_UDMA) += ast2600-udma.o > > obj-y += mediatek/ > obj-y += qcom/ > diff --git a/drivers/dma/ast2600-udma.c b/drivers/dma/ast2600-udma.c > new file mode 100644 > index 000000000000..ff678724f9d9 > --- /dev/null > +++ b/drivers/dma/ast2600-udma.c > @@ -0,0 +1,528 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) ASPEED Technology Inc. > + */ > +#include <linux/delay.h> > +#include <linux/bitfield.h> > +#include <linux/interrupt.h> > +#include <linux/dmaengine.h> > +#include <linux/dma-mapping.h> > +#include <linux/platform_device.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_dma.h> > +#include <linux/of_irq.h> > +#include <linux/of_address.h> You probably don't need these as you should use platform APIs instead.
