--- a/arch/arm/mach-cns3xxx/Kconfig
+++ b/arch/arm/mach-cns3xxx/Kconfig
@@ -6,6 +6,7 @@ menuconfig ARCH_CNS3XXX
 	select HAVE_ARM_SCU if SMP
 	select HAVE_ARM_TWD
 	select HAVE_SMP
+	select FIQ
 	help
 	  Support for Cavium Networks CNS3XXX platform.
 
--- a/arch/arm/mach-cns3xxx/Makefile
+++ b/arch/arm/mach-cns3xxx/Makefile
@@ -6,5 +6,5 @@ cns3xxx-y				+= core.o pm.o
 cns3xxx-$(CONFIG_ATAGS)			+= devices.o
 cns3xxx-$(CONFIG_PCI)			+= pcie.o
 cns3xxx-$(CONFIG_MACH_CNS3420VB)	+= cns3420vb.o
-cns3xxx-$(CONFIG_SMP)			+= platsmp.o headsmp.o
+cns3xxx-$(CONFIG_SMP)			+= platsmp.o headsmp.o cns3xxx_fiq.o
 cns3xxx-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
--- a/arch/arm/mach-cns3xxx/cns3xxx.h
+++ b/arch/arm/mach-cns3xxx/cns3xxx.h
@@ -261,6 +261,7 @@
 #define MISC_PCIE_INT_MASK(x)			MISC_MEM_MAP(0x978 + (x) * 0x100)
 #define MISC_PCIE_INT_STATUS(x)			MISC_MEM_MAP(0x97C + (x) * 0x100)
 
+#define MISC_FIQ_CPU(x)				MISC_MEM_MAP(0xA58 - (x) * 0x4)
 /*
  * Power management and clock control
  */
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -905,7 +905,7 @@ config VDSO
 
 config DMA_CACHE_RWFO
 	bool "Enable read/write for ownership DMA cache maintenance"
-	depends on CPU_V6K && SMP
+	depends on CPU_V6K && SMP && !ARCH_CNS3XXX
 	default y
 	help
 	  The Snoop Control Unit on ARM11MPCore does not detect the
