-#define DEF_MMIO_IN(name, type, insn) \
-static inline type name(const volatile type __iomem *addr) \
+/* gcc 4.0 and older doesn't have 'Z' constraint */
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)
+#define DEF_MMIO_IN_LE(name, size, insn) \
+static inline u##size name(const volatile u##size __iomem *addr) \
+{ \
+ u##size ret; \
+ __asm__ __volatile__("sync;"#insn" %0,0,%1;twi 0,%0,0;isync" \
+ : "=r" (ret) : "r" (addr), "m" (*addr) : "memory"); \
+ return ret; \
+}
+
+#define DEF_MMIO_OUT_LE(name, size, insn) \
+static inline void name(volatile u##size __iomem *addr, u##size val) \