diff --git a/arch/csky/include/asm/pci.h b/arch/csky/include/asm/pci.h
index 5c02454ec724..875bc028f8f6 100644
--- a/arch/csky/include/asm/pci.h
+++ b/arch/csky/include/asm/pci.h
@@ -15,6 +15,8 @@
 /* C-SKY shim does not initialize PCI bus */
 #define pcibios_assign_all_busses() 1
 
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE	1
+
 #ifdef CONFIG_PCI
 static inline int pci_proc_domain(struct pci_bus *bus)
 {