diff --git a/arch/m32r/kernel/io_m32104ut.c b/arch/m32r/kernel/io_m32104ut.c
index 3df4215f16432bf1662d5f721c1b69b33531b4ad..d26adab9586c65094f0f2beb8672d08dbf32570d 100644
--- a/arch/m32r/kernel/io_m32104ut.c
+++ b/arch/m32r/kernel/io_m32104ut.c
@@ -32,7 +32,7 @@ extern void pcc_iowrite_word(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port + NONCACHE_OFFSET);
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 #if defined(CONFIG_IDE) && !defined(CONFIG_M32R_CFC)
@@ -41,15 +41,15 @@ static inline void *__port2addr_ata(unsigned long port)
 	static int	dummy_reg;
 
 	switch (port) {
-	case 0x1f0:	return (void *)0xac002000;
-	case 0x1f1:	return (void *)0xac012800;
-	case 0x1f2:	return (void *)0xac012002;
-	case 0x1f3:	return (void *)0xac012802;
-	case 0x1f4:	return (void *)0xac012004;
-	case 0x1f5:	return (void *)0xac012804;
-	case 0x1f6:	return (void *)0xac012006;
-	case 0x1f7:	return (void *)0xac012806;
-	case 0x3f6:	return (void *)0xac01200e;
+	case 0x1f0:	return (void *)(0x0c002000 | NONCACHE_OFFSET);
+	case 0x1f1:	return (void *)(0x0c012800 | NONCACHE_OFFSET);
+	case 0x1f2:	return (void *)(0x0c012002 | NONCACHE_OFFSET);
+	case 0x1f3:	return (void *)(0x0c012802 | NONCACHE_OFFSET);
+	case 0x1f4:	return (void *)(0x0c012004 | NONCACHE_OFFSET);
+	case 0x1f5:	return (void *)(0x0c012804 | NONCACHE_OFFSET);
+	case 0x1f6:	return (void *)(0x0c012006 | NONCACHE_OFFSET);
+	case 0x1f7:	return (void *)(0x0c012806 | NONCACHE_OFFSET);
+	case 0x3f6:	return (void *)(0x0c01200e | NONCACHE_OFFSET);
 	default: 	return (void *)&dummy_reg;
 	}
 }
@@ -60,8 +60,8 @@ static inline void *__port2addr_ata(unsigned long port)
  * from 0x01000000 to 0x01ffffff on physical address.
  * The base address of LAN controller(LAN91C111) is 0x300.
  */
-#define LAN_IOSTART	0x300
-#define LAN_IOEND	0x320
+#define LAN_IOSTART	(0x300 | NONCACHE_OFFSET)
+#define LAN_IOEND	(0x320 | NONCACHE_OFFSET)
 static inline void *_port2addr_ne(unsigned long port)
 {
 	return (void *)(port + NONCACHE_OFFSET + 0x01000000);
diff --git a/arch/m32r/kernel/io_m32700ut.c b/arch/m32r/kernel/io_m32700ut.c
index eda9f963c1ebc38f5179be4a98cc8a9c922e3db5..939932d6cc00609358352e9b62fcecd9e3e9782f 100644
--- a/arch/m32r/kernel/io_m32700ut.c
+++ b/arch/m32r/kernel/io_m32700ut.c
@@ -36,7 +36,7 @@ extern void pcc_iowrite_word(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port + NONCACHE_OFFSET);
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 #if defined(CONFIG_IDE) && !defined(CONFIG_M32R_CFC)
@@ -45,15 +45,15 @@ static inline void *__port2addr_ata(unsigned long port)
 	static int	dummy_reg;
 
 	switch (port) {
-	case 0x1f0:	return (void *)0xac002000;
-	case 0x1f1:	return (void *)0xac012800;
-	case 0x1f2:	return (void *)0xac012002;
-	case 0x1f3:	return (void *)0xac012802;
-	case 0x1f4:	return (void *)0xac012004;
-	case 0x1f5:	return (void *)0xac012804;
-	case 0x1f6:	return (void *)0xac012006;
-	case 0x1f7:	return (void *)0xac012806;
-	case 0x3f6:	return (void *)0xac01200e;
+	case 0x1f0:	return (void *)(0x0c002000 | NONCACHE_OFFSET);
+	case 0x1f1:	return (void *)(0x0c012800 | NONCACHE_OFFSET);
+	case 0x1f2:	return (void *)(0x0c012002 | NONCACHE_OFFSET);
+	case 0x1f3:	return (void *)(0x0c012802 | NONCACHE_OFFSET);
+	case 0x1f4:	return (void *)(0x0c012004 | NONCACHE_OFFSET);
+	case 0x1f5:	return (void *)(0x0c012804 | NONCACHE_OFFSET);
+	case 0x1f6:	return (void *)(0x0c012006 | NONCACHE_OFFSET);
+	case 0x1f7:	return (void *)(0x0c012806 | NONCACHE_OFFSET);
+	case 0x3f6:	return (void *)(0x0c01200e | NONCACHE_OFFSET);
 	default: 	return (void *)&dummy_reg;
 	}
 }
@@ -64,8 +64,8 @@ static inline void *__port2addr_ata(unsigned long port)
  * from 0x10000000 to 0x13ffffff on physical address.
  * The base address of LAN controller(LAN91C111) is 0x300.
  */
-#define LAN_IOSTART	0xa0000300
-#define LAN_IOEND	0xa0000320
+#define LAN_IOSTART	(0x300 | NONCACHE_OFFSET)
+#define LAN_IOEND	(0x320 | NONCACHE_OFFSET)
 static inline void *_port2addr_ne(unsigned long port)
 {
 	return (void *)(port + 0x10000000);
diff --git a/arch/m32r/kernel/io_mappi.c b/arch/m32r/kernel/io_mappi.c
index 3c3da042fbd1437a26cb11dcfaf081696c2cdfb5..a662b537c5ba4bb9729cb7435fb84509473fbc31 100644
--- a/arch/m32r/kernel/io_mappi.c
+++ b/arch/m32r/kernel/io_mappi.c
@@ -31,7 +31,7 @@ extern void pcc_iowrite(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port | (NONCACHE_OFFSET));
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 static inline void *_port2addr_ne(unsigned long port)
diff --git a/arch/m32r/kernel/io_mappi2.c b/arch/m32r/kernel/io_mappi2.c
index df3c729cb3e0afc7d53cc84cc51b1545dc261495..e72d725606afc83a8b0273431f8e8d08c1369e8f 100644
--- a/arch/m32r/kernel/io_mappi2.c
+++ b/arch/m32r/kernel/io_mappi2.c
@@ -33,7 +33,7 @@ extern void pcc_iowrite_word(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port | (NONCACHE_OFFSET));
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 #if defined(CONFIG_IDE) && !defined(CONFIG_M32R_CFC)
@@ -42,22 +42,22 @@ static inline void *__port2addr_ata(unsigned long port)
 	static int	dummy_reg;
 
 	switch (port) {
-	case 0x1f0:	return (void *)0xac002000;
-	case 0x1f1:	return (void *)0xac012800;
-	case 0x1f2:	return (void *)0xac012002;
-	case 0x1f3:	return (void *)0xac012802;
-	case 0x1f4:	return (void *)0xac012004;
-	case 0x1f5:	return (void *)0xac012804;
-	case 0x1f6:	return (void *)0xac012006;
-	case 0x1f7:	return (void *)0xac012806;
-	case 0x3f6:	return (void *)0xac01200e;
+	case 0x1f0:	return (void *)(0x0c002000 | NONCACHE_OFFSET);
+	case 0x1f1:	return (void *)(0x0c012800 | NONCACHE_OFFSET);
+	case 0x1f2:	return (void *)(0x0c012002 | NONCACHE_OFFSET);
+	case 0x1f3:	return (void *)(0x0c012802 | NONCACHE_OFFSET);
+	case 0x1f4:	return (void *)(0x0c012004 | NONCACHE_OFFSET);
+	case 0x1f5:	return (void *)(0x0c012804 | NONCACHE_OFFSET);
+	case 0x1f6:	return (void *)(0x0c012006 | NONCACHE_OFFSET);
+	case 0x1f7:	return (void *)(0x0c012806 | NONCACHE_OFFSET);
+	case 0x3f6:	return (void *)(0x0c01200e | NONCACHE_OFFSET);
 	default: 	return (void *)&dummy_reg;
 	}
 }
 #endif
 
-#define LAN_IOSTART	0xa0000300
-#define LAN_IOEND	0xa0000320
+#define LAN_IOSTART	(0x300 | NONCACHE_OFFSET)
+#define LAN_IOEND	(0x320 | NONCACHE_OFFSET)
 #ifdef CONFIG_CHIP_OPSP
 static inline void *_port2addr_ne(unsigned long port)
 {
diff --git a/arch/m32r/kernel/io_mappi3.c b/arch/m32r/kernel/io_mappi3.c
index f80321a58764c71b882c50e5f509259314bdacdf..ed6da930bc64ab5e321c2e0e6fbcb2e3e807b0bd 100644
--- a/arch/m32r/kernel/io_mappi3.c
+++ b/arch/m32r/kernel/io_mappi3.c
@@ -33,7 +33,7 @@ extern void pcc_iowrite_word(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port + NONCACHE_OFFSET);
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 #if defined(CONFIG_IDE)
@@ -43,33 +43,42 @@ static inline void *__port2addr_ata(unsigned long port)
 
 	switch (port) {
 	  /* IDE0 CF */
-	case 0x1f0:	return (void *)0xb4002000;
-	case 0x1f1:	return (void *)0xb4012800;
-	case 0x1f2:	return (void *)0xb4012002;
-	case 0x1f3:	return (void *)0xb4012802;
-	case 0x1f4:	return (void *)0xb4012004;
-	case 0x1f5:	return (void *)0xb4012804;
-	case 0x1f6:	return (void *)0xb4012006;
-	case 0x1f7:	return (void *)0xb4012806;
-	case 0x3f6:	return (void *)0xb401200e;
+	case 0x1f0:	return (void *)(0x14002000 | NONCACHE_OFFSET);
+	case 0x1f1:	return (void *)(0x14012800 | NONCACHE_OFFSET);
+	case 0x1f2:	return (void *)(0x14012002 | NONCACHE_OFFSET);
+	case 0x1f3:	return (void *)(0x14012802 | NONCACHE_OFFSET);
+	case 0x1f4:	return (void *)(0x14012004 | NONCACHE_OFFSET);
+	case 0x1f5:	return (void *)(0x14012804 | NONCACHE_OFFSET);
+	case 0x1f6:	return (void *)(0x14012006 | NONCACHE_OFFSET);
+	case 0x1f7:	return (void *)(0x14012806 | NONCACHE_OFFSET);
+	case 0x3f6:	return (void *)(0x1401200e | NONCACHE_OFFSET);
 	  /* IDE1 IDE */
-	case 0x170:	return (void *)0xb4810000;  /* Data 16bit */
-	case 0x171:	return (void *)0xb4810002;  /* Features / Error */
-	case 0x172:	return (void *)0xb4810004;  /* Sector count */
-	case 0x173:	return (void *)0xb4810006;  /* Sector number */
-	case 0x174:	return (void *)0xb4810008;  /* Cylinder low */
-	case 0x175:	return (void *)0xb481000a;  /* Cylinder high */
-	case 0x176:	return (void *)0xb481000c;  /* Device head */
-	case 0x177:	return (void *)0xb481000e;  /* Command     */
-	case 0x376:	return (void *)0xb480800c;  /* Device control / Alt status */
+	case 0x170:	/* Data 16bit */
+			return (void *)(0x14810000 | NONCACHE_OFFSET);
+	case 0x171:	/* Features / Error */
+			return (void *)(0x14810002 | NONCACHE_OFFSET);
+	case 0x172:	/* Sector count */
+			return (void *)(0x14810004 | NONCACHE_OFFSET);
+	case 0x173:	/* Sector number */
+			return (void *)(0x14810006 | NONCACHE_OFFSET);
+	case 0x174:	/* Cylinder low */
+			return (void *)(0x14810008 | NONCACHE_OFFSET);
+	case 0x175:	/* Cylinder high */
+			return (void *)(0x1481000a | NONCACHE_OFFSET);
+	case 0x176:	/* Device head */
+			return (void *)(0x1481000c | NONCACHE_OFFSET);
+	case 0x177:	/* Command     */
+			return (void *)(0x1481000e | NONCACHE_OFFSET);
+	case 0x376:	/* Device control / Alt status */
+			return (void *)(0x1480800c | NONCACHE_OFFSET);
 
 	default: 	return (void *)&dummy_reg;
 	}
 }
 #endif
 
-#define LAN_IOSTART	0xa0000300
-#define LAN_IOEND	0xa0000320
+#define LAN_IOSTART	(0x300 | NONCACHE_OFFSET)
+#define LAN_IOEND	(0x320 | NONCACHE_OFFSET)
 static inline void *_port2addr_ne(unsigned long port)
 {
 	return (void *)(port + 0x10000000);
diff --git a/arch/m32r/kernel/io_oaks32r.c b/arch/m32r/kernel/io_oaks32r.c
index 8be323931e4ab66d37397ebf8674fdbc5ad69fd9..910dd131c22751b202d9ad5b0981808567c00266 100644
--- a/arch/m32r/kernel/io_oaks32r.c
+++ b/arch/m32r/kernel/io_oaks32r.c
@@ -16,7 +16,7 @@
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port | (NONCACHE_OFFSET));
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 static inline  void *_port2addr_ne(unsigned long port)
diff --git a/arch/m32r/kernel/io_opsput.c b/arch/m32r/kernel/io_opsput.c
index 4793bd18e11599a187e1f1068cb6b80bc7c13c39..bec69297db3c6f31c0cfc4aa03d5ad98cc98943f 100644
--- a/arch/m32r/kernel/io_opsput.c
+++ b/arch/m32r/kernel/io_opsput.c
@@ -36,7 +36,7 @@ extern void pcc_iowrite_word(int, unsigned long, void *, size_t, size_t, int);
 
 static inline void *_port2addr(unsigned long port)
 {
-	return (void *)(port | (NONCACHE_OFFSET));
+	return (void *)(port | NONCACHE_OFFSET);
 }
 
 /*
@@ -44,8 +44,8 @@ static inline void *_port2addr(unsigned long port)
  * from 0x10000000 to 0x13ffffff on physical address.
  * The base address of LAN controller(LAN91C111) is 0x300.
  */
-#define LAN_IOSTART	0xa0000300
-#define LAN_IOEND	0xa0000320
+#define LAN_IOSTART	(0x300 | NONCACHE_OFFSET)
+#define LAN_IOEND	(0x320 | NONCACHE_OFFSET)
 static inline void *_port2addr_ne(unsigned long port)
 {
 	return (void *)(port + 0x10000000);
diff --git a/include/asm-m32r/m32r.h b/include/asm-m32r/m32r.h
index f9bb48ac9d7fb6dc216b721b36ca61eccd12aab6..b133ca61acf197247921d7cb3f9f434452dfdb76 100644
--- a/include/asm-m32r/m32r.h
+++ b/include/asm-m32r/m32r.h
@@ -126,7 +126,7 @@
 
 #include <asm/page.h>
 #ifdef CONFIG_MMU
-#define NONCACHE_OFFSET  __PAGE_OFFSET+0x20000000
+#define NONCACHE_OFFSET  (__PAGE_OFFSET + 0x20000000)
 #else
 #define NONCACHE_OFFSET  __PAGE_OFFSET
 #endif /* CONFIG_MMU */