-extern u8 iSeries_Read_Byte(void* IoAddress);
-extern u16 iSeries_Read_Word(void* IoAddress);
-extern u32 iSeries_Read_Long(void* IoAddress);
-extern void iSeries_Write_Byte(u8 IoData,void* IoAddress);
-extern void iSeries_Write_Word(u16 IoData,void* IoAddress);
-extern void iSeries_Write_Long(u32 IoData,void* IoAddress);
+extern u8 iSeries_Read_Byte(const volatile void __iomem * IoAddress);
+extern u16 iSeries_Read_Word(const volatile void __iomem * IoAddress);
+extern u32 iSeries_Read_Long(const volatile void __iomem * IoAddress);
+extern void iSeries_Write_Byte(u8 IoData, volatile void __iomem * IoAddress);
+extern void iSeries_Write_Word(u16 IoData, volatile void __iomem * IoAddress);
+extern void iSeries_Write_Long(u32 IoData, volatile void __iomem * IoAddress);