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arm: mvebu: Use dw-apb-uart instead of ns16650 as UART driver 

The UART controller used in the Armada 370 and Armada XP SoCs is the
Synopsys DesignWare 8250 (aka Synopsys DesignWare ABP UART). The
improper use of the ns16550 can lead to a kernel oops during boot if
a character is sent to the UART before the initialization of the
driver. The DW APB has an extra interrupt that gets raised when
writing to the LCR when busy. This explains why we need to use
dw-apb-uart driver to handle this.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Gregory CLEMENT 2012-12-04 18:04:59 +01:00 committed by Jason Cooper
parent d1c3ed669a
commit b24212fbfb
3 changed files with 9 additions and 7 deletions
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6
arch/arm/boot/dts/armada-370-xp.dtsi
View File

@ -50,17 +50,19 @@
ranges;
serial@d0012000 {
compatible = "ns16550";
compatible = "snps,dw-apb-uart";
reg = <0xd0012000 0x100>;
reg-shift = <2>;
interrupts = <41>;
reg-io-width = <4>;
status = "disabled";
};
serial@d0012100 {
compatible = "ns16550";
compatible = "snps,dw-apb-uart";
reg = <0xd0012100 0x100>;
reg-shift = <2>;
interrupts = <42>;
reg-io-width = <4>;
status = "disabled";
};

6
arch/arm/boot/dts/armada-xp.dtsi
View File

@ -42,17 +42,19 @@
soc {
serial@d0012200 {
compatible = "ns16550";
compatible = "snps,dw-apb-uart";
reg = <0xd0012200 0x100>;
reg-shift = <2>;
interrupts = <43>;
reg-io-width = <4>;
status = "disabled";
};
serial@d0012300 {
compatible = "ns16550";
compatible = "snps,dw-apb-uart";
reg = <0xd0012300 0x100>;
reg-shift = <2>;
interrupts = <44>;
reg-io-width = <4>;
status = "disabled";
};

4
arch/arm/configs/mvebu_defconfig
View File

@ -33,9 +33,7 @@ CONFIG_MVNETA=y
CONFIG_MARVELL_PHY=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y
CONFIG_I2C=y
CONFIG_I2C_MV64XXX=y
CONFIG_SERIAL_8250_DW=y
CONFIG_GPIOLIB=y
CONFIG_GPIO_SYSFS=y
# CONFIG_USB_SUPPORT is not set