diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
new file mode 100644
index 000000000000..0a0558567eaa
--- /dev/null
+++ b/arch/csky/Kconfig
@@ -0,0 +1,205 @@
+config CSKY
+	def_bool y
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_USE_BUILTIN_BSWAP
+	select ARCH_USE_QUEUED_RWLOCKS if NR_CPUS>2
+	select COMMON_CLK
+	select CLKSRC_MMIO
+	select CLKSRC_OF
+	select DMA_DIRECT_OPS
+	select DMA_NONCOHERENT_OPS
+	select IRQ_DOMAIN
+	select HANDLE_DOMAIN_IRQ
+	select DW_APB_TIMER_OF
+	select GENERIC_LIB_ASHLDI3
+	select GENERIC_LIB_ASHRDI3
+	select GENERIC_LIB_LSHRDI3
+	select GENERIC_LIB_MULDI3
+	select GENERIC_LIB_CMPDI2
+	select GENERIC_LIB_UCMPDI2
+	select GENERIC_ALLOCATOR
+	select GENERIC_ATOMIC64
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_CPU_DEVICES
+	select GENERIC_IRQ_CHIP
+	select GENERIC_IRQ_PROBE
+	select GENERIC_IRQ_SHOW
+	select GENERIC_IRQ_MULTI_HANDLER
+	select GENERIC_SCHED_CLOCK
+	select GENERIC_SMP_IDLE_THREAD
+	select HAVE_ARCH_TRACEHOOK
+	select HAVE_GENERIC_DMA_COHERENT
+	select HAVE_KERNEL_GZIP
+	select HAVE_KERNEL_LZO
+	select HAVE_KERNEL_LZMA
+	select HAVE_C_RECORDMCOUNT
+	select HAVE_DMA_API_DEBUG
+	select HAVE_DMA_CONTIGUOUS
+	select HAVE_MEMBLOCK
+	select MAY_HAVE_SPARSE_IRQ
+	select MODULES_USE_ELF_RELA if MODULES
+	select NO_BOOTMEM
+	select OF
+	select OF_EARLY_FLATTREE
+	select OF_RESERVED_MEM
+	select PERF_USE_VMALLOC
+	select RTC_LIB
+	select TIMER_OF
+	select USB_ARCH_HAS_EHCI
+	select USB_ARCH_HAS_OHCI
+
+config CPU_HAS_CACHEV2
+	bool
+
+config CPU_HAS_FPUV2
+	bool
+
+config CPU_HAS_HILO
+	bool
+
+config CPU_HAS_TLBI
+	bool
+
+config CPU_HAS_LDSTEX
+	bool
+	help
+	  For SMP, CPU needs "ldex&stex" instrcutions to atomic operations.
+
+config CPU_NEED_TLBSYNC
+	bool
+
+config CPU_NEED_SOFTALIGN
+	bool
+
+config CPU_NO_USER_BKPT
+	bool
+	help
+	  For abiv2 we couldn't use "trap 1" as user space bkpt in gdbserver, because
+	  abiv2 is 16/32bit instruction set and "trap 1" is 32bit.
+	  So we need a 16bit instruction as user space bkpt, and it will cause an illegal
+	  instruction exception.
+	  In kernel we parse the *regs->pc to determine whether to send SIGTRAP or not.
+
+config GENERIC_CALIBRATE_DELAY
+	def_bool y
+
+config GENERIC_CSUM
+	def_bool y
+
+config GENERIC_HWEIGHT
+	def_bool y
+
+config MMU
+	def_bool y
+
+config RWSEM_GENERIC_SPINLOCK
+	def_bool y
+
+config TIME_LOW_RES
+	def_bool y
+
+config TRACE_IRQFLAGS_SUPPORT
+	def_bool y
+
+config CPU_TLB_SIZE
+	int
+	default "128"	if (CPU_CK610 || CPU_CK807 || CPU_CK810)
+	default "1024"	if (CPU_CK860)
+
+config CPU_ASID_BITS
+	int
+	default "8"	if (CPU_CK610 || CPU_CK807 || CPU_CK810)
+	default "12"	if (CPU_CK860)
+
+config L1_CACHE_SHIFT
+	int
+	default "4"	if (CPU_CK610)
+	default "5"	if (CPU_CK807 || CPU_CK810)
+	default "6"	if (CPU_CK860)
+
+menu "Processor type and features"
+
+choice
+	prompt "CPU MODEL"
+	default CPU_CK807
+
+config CPU_CK610
+	bool "CSKY CPU ck610"
+	select CPU_NEED_TLBSYNC
+	select CPU_NEED_SOFTALIGN
+	select CPU_NO_USER_BKPT
+
+config CPU_CK810
+	bool "CSKY CPU ck810"
+	select CPU_HAS_HILO
+	select CPU_NEED_TLBSYNC
+
+config CPU_CK807
+	bool "CSKY CPU ck807"
+	select CPU_HAS_HILO
+
+config CPU_CK860
+	bool "CSKY CPU ck860"
+	select CPU_HAS_TLBI
+	select CPU_HAS_CACHEV2
+	select CPU_HAS_LDSTEX
+	select CPU_HAS_FPUV2
+endchoice
+
+choice
+	prompt "Power Manager Instruction (wait/doze/stop)"
+	default CPU_PM_NONE
+
+config CPU_PM_NONE
+	bool "None"
+
+config CPU_PM_WAIT
+	bool "wait"
+
+config CPU_PM_DOZE
+	bool "doze"
+
+config CPU_PM_STOP
+	bool "stop"
+endchoice
+
+config CPU_HAS_VDSP
+	bool "CPU has VDSP coprocessor"
+	depends on CPU_HAS_FPU && CPU_HAS_FPUV2
+
+config CPU_HAS_FPU
+	bool "CPU has FPU coprocessor"
+	depends on CPU_CK807 || CPU_CK810 || CPU_CK860
+
+config CPU_HAS_TEE
+	bool "CPU has Trusted Execution Environment"
+	depends on CPU_CK810
+
+config SMP
+	bool "Symmetric Multi-Processing (SMP) support for C-SKY"
+	depends on CPU_CK860
+	default n
+
+config NR_CPUS
+	int "Maximum number of CPUs (2-32)"
+	range 2 32
+	depends on SMP
+	default "2"
+
+config HIGHMEM
+	bool "High Memory Support"
+	depends on !CPU_CK610
+	default y
+
+config FORCE_MAX_ZONEORDER
+	int "Maximum zone order"
+	default "11"
+
+config RAM_BASE
+	hex "DRAM start addr (the same with memory-section in dts)"
+	default 0x0
+
+endmenu
+
+source "kernel/Kconfig.hz"
diff --git a/arch/csky/Kconfig.debug b/arch/csky/Kconfig.debug
new file mode 100644
index 000000000000..48cf6ff9df4a
--- /dev/null
+++ b/arch/csky/Kconfig.debug
@@ -0,0 +1,9 @@
+menu "C-SKY Debug Options"
+config CSKY_BUILTIN_DTB
+	string "Use kernel builtin dtb"
+	help
+	  User could define the dtb instead of the one which is passed from
+	  bootloader.
+	  Sometimes for debug, we want to use a built-in dtb and then we needn't
+	  modify bootloader at all.
+endmenu
diff --git a/arch/csky/Makefile b/arch/csky/Makefile
new file mode 100644
index 000000000000..67a4ae1fba2b
--- /dev/null
+++ b/arch/csky/Makefile
@@ -0,0 +1,93 @@
+OBJCOPYFLAGS		:=-O binary
+GZFLAGS			:=-9
+KBUILD_DEFCONFIG	:= defconfig
+
+ifdef CONFIG_CPU_HAS_FPU
+FPUEXT = f
+endif
+
+ifdef CONFIG_CPU_HAS_VDSP
+VDSPEXT = v
+endif
+
+ifdef CONFIG_CPU_HAS_TEE
+TEEEXT = t
+endif
+
+ifdef CONFIG_CPU_CK610
+CPUTYPE	= ck610
+CSKYABI	= abiv1
+endif
+
+ifdef CONFIG_CPU_CK810
+CPUTYPE = ck810
+CSKYABI	= abiv2
+endif
+
+ifdef CONFIG_CPU_CK807
+CPUTYPE = ck807
+CSKYABI	= abiv2
+endif
+
+ifdef CONFIG_CPU_CK860
+CPUTYPE = ck860
+CSKYABI	= abiv2
+endif
+
+ifneq ($(CSKYABI),)
+MCPU_STR = $(CPUTYPE)$(FPUEXT)$(VDSPEXT)$(TEEEXT)
+KBUILD_CFLAGS += -mcpu=$(MCPU_STR)
+KBUILD_CFLAGS += -DCSKYCPU_DEF_NAME=\"$(MCPU_STR)\"
+KBUILD_CFLAGS += -msoft-float -mdiv
+KBUILD_CFLAGS += -fno-tree-vectorize
+endif
+
+KBUILD_CFLAGS += -pipe
+ifeq ($(CSKYABI),abiv2)
+KBUILD_CFLAGS += -mno-stack-size
+endif
+
+abidirs := $(patsubst %,arch/csky/%/,$(CSKYABI))
+KBUILD_CFLAGS += $(patsubst %,-I$(srctree)/%inc,$(abidirs))
+
+KBUILD_CPPFLAGS += -mlittle-endian
+LDFLAGS += -EL
+
+KBUILD_AFLAGS += $(KBUILD_CFLAGS)
+
+head-y := arch/csky/kernel/head.o
+
+core-y += arch/csky/kernel/
+core-y += arch/csky/mm/
+core-y += arch/csky/$(CSKYABI)/
+
+libs-y += arch/csky/lib/ \
+	$(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
+
+boot := arch/csky/boot
+ifneq '$(CONFIG_CSKY_BUILTIN_DTB)' '""'
+core-y += $(boot)/dts/
+endif
+
+all: zImage
+
+
+dtbs: scripts
+	$(Q)$(MAKE) $(build)=$(boot)/dts
+
+%.dtb %.dtb.S %.dtb.o: scripts
+	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
+
+zImage Image uImage: vmlinux dtbs
+	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+
+archclean:
+	$(Q)$(MAKE) $(clean)=$(boot)
+	$(Q)$(MAKE) $(clean)=$(boot)/dts
+	rm -rf arch/csky/include/generated
+
+define archhelp
+  echo  '* zImage       - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
+  echo  '  Image        - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
+  echo  '  uImage       - U-Boot wrapped zImage'
+endef
diff --git a/arch/csky/abiv1/Makefile b/arch/csky/abiv1/Makefile
new file mode 100644
index 000000000000..7c062768d44d
--- /dev/null
+++ b/arch/csky/abiv1/Makefile
@@ -0,0 +1,8 @@
+obj-$(CONFIG_CPU_NEED_SOFTALIGN)	+= alignment.o
+obj-y					+= bswapdi.o
+obj-y					+= bswapsi.o
+obj-y					+= cacheflush.o
+obj-y					+= mmap.o
+obj-y					+= memcpy.o
+obj-y					+= memset.o
+obj-y					+= strksyms.o
diff --git a/arch/csky/abiv2/Makefile b/arch/csky/abiv2/Makefile
new file mode 100644
index 000000000000..069ca7276b99
--- /dev/null
+++ b/arch/csky/abiv2/Makefile
@@ -0,0 +1,10 @@
+obj-y				+= cacheflush.o
+obj-$(CONFIG_CPU_HAS_FPU)	+= fpu.o
+obj-y				+= memcmp.o
+obj-y				+= memcpy.o
+obj-y				+= memmove.o
+obj-y				+= memset.o
+obj-y				+= strcmp.o
+obj-y				+= strcpy.o
+obj-y				+= strlen.o
+obj-y				+= strksyms.o
diff --git a/arch/csky/boot/Makefile b/arch/csky/boot/Makefile
new file mode 100644
index 000000000000..47d3d723784c
--- /dev/null
+++ b/arch/csky/boot/Makefile
@@ -0,0 +1,24 @@
+targets := Image zImage uImage
+targets += $(dtb-y)
+
+$(obj)/Image: vmlinux FORCE
+	$(call if_changed,objcopy)
+	@echo '  Kernel: $@ is ready'
+
+compress-$(CONFIG_KERNEL_GZIP) = gzip
+compress-$(CONFIG_KERNEL_LZO)  = lzo
+compress-$(CONFIG_KERNEL_LZMA) = lzma
+compress-$(CONFIG_KERNEL_XZ)   = xzkern
+compress-$(CONFIG_KERNEL_LZ4)  = lz4
+
+$(obj)/zImage:  $(obj)/Image FORCE
+	$(call if_changed,$(compress-y))
+	@echo '  Kernel: $@ is ready'
+
+UIMAGE_ARCH		= sandbox
+UIMAGE_COMPRESSION	= $(compress-y)
+UIMAGE_LOADADDR		= $(shell $(NM) vmlinux | awk '$$NF == "_start" {print $$1}')
+
+$(obj)/uImage: $(obj)/zImage
+	$(call if_changed,uimage)
+	@echo 'Image: $@ is ready'
diff --git a/arch/csky/boot/dts/Makefile b/arch/csky/boot/dts/Makefile
new file mode 100644
index 000000000000..305e81a5e91e
--- /dev/null
+++ b/arch/csky/boot/dts/Makefile
@@ -0,0 +1,13 @@
+dtstree	:= $(srctree)/$(src)
+
+ifneq '$(CONFIG_CSKY_BUILTIN_DTB)' '""'
+builtindtb-y := $(patsubst "%",%,$(CONFIG_CSKY_BUILTIN_DTB))
+dtb-y += $(builtindtb-y).dtb
+obj-y += $(builtindtb-y).dtb.o
+.SECONDARY: $(obj)/$(builtindtb-y).dtb.S
+else
+dtb-y := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
+endif
+
+always += $(dtb-y)
+clean-files += *.dtb *.dtb.S
diff --git a/arch/csky/boot/dts/include/dt-bindings b/arch/csky/boot/dts/include/dt-bindings
new file mode 120000
index 000000000000..08c00e4972fa
--- /dev/null
+++ b/arch/csky/boot/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../../include/dt-bindings
\ No newline at end of file
diff --git a/arch/csky/include/asm/Kbuild b/arch/csky/include/asm/Kbuild
new file mode 100644
index 000000000000..2a0abe8f2a35
--- /dev/null
+++ b/arch/csky/include/asm/Kbuild
@@ -0,0 +1,49 @@
+generic-y += asm-offsets.h
+generic-y += bugs.h
+generic-y += clkdev.h
+generic-y += compat.h
+generic-y += current.h
+generic-y += delay.h
+generic-y += device.h
+generic-y += div64.h
+generic-y += dma.h
+generic-y += dma-contiguous.h
+generic-y += dma-mapping.h
+generic-y += emergency-restart.h
+generic-y += exec.h
+generic-y += fb.h
+generic-y += ftrace.h
+generic-y += futex.h
+generic-y += gpio.h
+generic-y += hardirq.h
+generic-y += hw_irq.h
+generic-y += irq.h
+generic-y += irq_regs.h
+generic-y += irq_work.h
+generic-y += kdebug.h
+generic-y += kmap_types.h
+generic-y += kprobes.h
+generic-y += kvm_para.h
+generic-y += linkage.h
+generic-y += local.h
+generic-y += local64.h
+generic-y += mm-arch-hooks.h
+generic-y += module.h
+generic-y += mutex.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += preempt.h
+generic-y += qrwlock.h
+generic-y += scatterlist.h
+generic-y += sections.h
+generic-y += serial.h
+generic-y += shm.h
+generic-y += timex.h
+generic-y += topology.h
+generic-y += trace_clock.h
+generic-y += unaligned.h
+generic-y += user.h
+generic-y += vga.h
+generic-y += vmlinux.lds.h
+generic-y += word-at-a-time.h
+generic-y += xor.h
diff --git a/arch/csky/include/uapi/asm/Kbuild b/arch/csky/include/uapi/asm/Kbuild
new file mode 100644
index 000000000000..e02fd44e6447
--- /dev/null
+++ b/arch/csky/include/uapi/asm/Kbuild
@@ -0,0 +1,32 @@
+include include/uapi/asm-generic/Kbuild.asm
+
+header-y += cachectl.h
+
+generic-y += auxvec.h
+generic-y += param.h
+generic-y += bpf_perf_event.h
+generic-y += errno.h
+generic-y += fcntl.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += ipcbuf.h
+generic-y += shmbuf.h
+generic-y += bitsperlong.h
+generic-y += mman.h
+generic-y += msgbuf.h
+generic-y += poll.h
+generic-y += posix_types.h
+generic-y += resource.h
+generic-y += sembuf.h
+generic-y += siginfo.h
+generic-y += signal.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += statfs.h
+generic-y += stat.h
+generic-y += setup.h
+generic-y += swab.h
+generic-y += termbits.h
+generic-y += termios.h
+generic-y += types.h
+generic-y += ucontext.h
diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile
new file mode 100644
index 000000000000..4422de756cde
--- /dev/null
+++ b/arch/csky/kernel/Makefile
@@ -0,0 +1,8 @@
+extra-y := head.o vmlinux.lds
+
+obj-y += entry.o atomic.o signal.o traps.o irq.o time.o vdso.o
+obj-y += power.o syscall.o syscall_table.o setup.o
+obj-y += process.o cpu-probe.o ptrace.o dumpstack.o
+
+obj-$(CONFIG_MODULES)			+= module.o
+obj-$(CONFIG_SMP)			+= smp.o
diff --git a/arch/csky/lib/Makefile b/arch/csky/lib/Makefile
new file mode 100644
index 000000000000..d1f368c59ef6
--- /dev/null
+++ b/arch/csky/lib/Makefile
@@ -0,0 +1 @@
+lib-y  := usercopy.o delay.o
diff --git a/arch/csky/mm/Makefile b/arch/csky/mm/Makefile
new file mode 100644
index 000000000000..c870eb36efbc
--- /dev/null
+++ b/arch/csky/mm/Makefile
@@ -0,0 +1,13 @@
+ifeq ($(CONFIG_CPU_HAS_CACHEV2),y)
+obj-y +=			cachev2.o
+else
+obj-y +=			cachev1.o
+endif
+
+obj-y +=			dma-mapping.o
+obj-y +=			fault.o
+obj-$(CONFIG_HIGHMEM) +=	highmem.o
+obj-y +=			init.o
+obj-y +=			ioremap.o
+obj-y +=			syscache.o
+obj-y +=			tlb.o