diff --git a/src/northbridge/intel/ironlake/gma.c b/src/northbridge/intel/ironlake/gma.c
index 8084560636..fb21d35b55 100644
--- a/src/northbridge/intel/ironlake/gma.c
+++ b/src/northbridge/intel/ironlake/gma.c
@@ -122,15 +122,15 @@ static void gma_enable_swsci(void)
 	/* clear DMISCI status */
 	reg16 = inw(DEFAULT_PMBASE + TCO1_STS);
 	reg16 &= DMISCI_STS;
-	outw(DEFAULT_PMBASE + TCO1_STS, reg16);
+	outw(reg16, DEFAULT_PMBASE + TCO1_STS);
 
 	/* clear acpi tco status */
-	outl(DEFAULT_PMBASE + GPE0_STS, TCOSCI_STS);
+	outl(TCOSCI_STS, DEFAULT_PMBASE + GPE0_STS);
 
 	/* enable acpi tco scis */
 	reg16 = inw(DEFAULT_PMBASE + GPE0_EN);
 	reg16 |= TCOSCI_EN;
-	outw(DEFAULT_PMBASE + GPE0_EN, reg16);
+	outw(reg16, DEFAULT_PMBASE + GPE0_EN);
 }
 
 static void gma_func0_init(struct device *dev)
diff --git a/src/northbridge/intel/sandybridge/gma.c b/src/northbridge/intel/sandybridge/gma.c
index d1b9263980..3eed5cc9bc 100644
--- a/src/northbridge/intel/sandybridge/gma.c
+++ b/src/northbridge/intel/sandybridge/gma.c
@@ -570,15 +570,15 @@ static void gma_enable_swsci(void)
 	/* Clear DMISCI status */
 	reg16 = inw(DEFAULT_PMBASE + TCO1_STS);
 	reg16 &= DMISCI_STS;
-	outw(DEFAULT_PMBASE + TCO1_STS, reg16);
+	outw(reg16, DEFAULT_PMBASE + TCO1_STS);
 
 	/* Clear ACPI TCO status */
-	outl(DEFAULT_PMBASE + GPE0_STS, TCOSCI_STS);
+	outl(TCOSCI_STS, DEFAULT_PMBASE + GPE0_STS);
 
 	/* Enable ACPI TCO SCIs */
 	reg16 = inw(DEFAULT_PMBASE + GPE0_EN);
 	reg16 |= TCOSCI_EN;
-	outw(DEFAULT_PMBASE + GPE0_EN, reg16);
+	outw(reg16, DEFAULT_PMBASE + GPE0_EN);
 }
 
 static void gma_func0_init(struct device *dev)