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Subject[patch v4 2/5] build configuration for AST2500 DMA UART driver
From: sudheer veliseti <>

build config for DMA based UART driver in AST2500.
Total Available UARTs in AST2500 are 4

Signed-off-by: sudheer veliseti <>

Changes from v3->v4:
- config name changed to SERIAL_AST_DMA_UART
- new config AST_UART_DMA_RX_INTERRUPT introduced
for selectin between DMA interrupt based RX vs timer based uart RX

Changes in v2->v3:
- change logs added

drivers/tty/serial/8250/Kconfig | 43 ++++++++++++++++++++++++++++++++
drivers/tty/serial/8250/Makefile | 1 +
2 files changed, 44 insertions(+)

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 15c2c5463835..7052ab0f4894 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -189,6 +189,49 @@ config SERIAL_8250_RUNTIME_UARTS
with the module parameter "nr_uarts", or boot-time parameter

+ tristate "AST UART driver with DMA"
+ select SERIAL_CORE
+ help
+ UART driver with DMA support for Aspeed BMC AST25XX.
+ this driver supports UARTs in AST2500. It uses
+ DMA channel of DMA engines present in these chips.
+ since this dma engine is used only by UARTs it is not
+ added as a separate DMA driver instead added as a layer
+ within UART driver.
+ bool "DMA interrupt of UART RX"
+ depends on SERIAL_AST_DMA_UART
+ default y
+ help
+ This config is Enabled by default,which means Rx part
+ of UART is handled by DMA interrupt.
+ if the version of chip AST2500 doesn't support
+ DMA interrupt based RX,then Disable this option.Refer
+ driver code to see how Rx is handled by timer,if Rx
+ interrupt is not available.
+ int "Maximum number of uart dma serial ports"
+ depends on SERIAL_AST_DMA_UART
+ default "4"
+ help
+ Set this to the number of serial ports you want the driver
+ to support. This includes any ports discovered via ACPI or
+ PCI enumeration and any ports that may be added at run-time
+ via hot-plug, or any ISA multi-port serial cards.
+ int "Number of uart dma serial ports to register at runtime"
+ depends on SERIAL_AST_DMA_UART
+ range 0 AST_NR_DMA_UARTS
+ default "4"
+ help
+ Set this to the maximum number of serial ports you want
+ the kernel to register at boot time.
bool "Extended 8250/16550 serial driver options"
depends on SERIAL_8250
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 18751bc63a84..251f2e85efa1 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_SERIAL_8250_LPSS) += 8250_lpss.o
obj-$(CONFIG_SERIAL_8250_MID) += 8250_mid.o
obj-$(CONFIG_SERIAL_8250_MOXA) += 8250_moxa.o
obj-$(CONFIG_SERIAL_8250_PXA) += 8250_pxa.o
+obj-$(CONFIG_SERIAL_AST_DMA_UART) += 8250_ast2500_uart_dma.o
obj-$(CONFIG_SERIAL_OF_PLATFORM) += 8250_of.o

CFLAGS_8250_ingenic.o += -I$(srctree)/scripts/dtc/libfdt
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