diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 671e7966500946770e27c3efc4af5f91cd303cf5..483269db2c7d44037a4b7268470c6bae6574e831 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1121,12 +1121,12 @@ static int piix_disable_ahci(struct pci_dev *pdev)
 	if (!mmio)
 		return -ENOMEM;
 
-	tmp = readl(mmio + AHCI_GLOBAL_CTL);
+	tmp = ioread32(mmio + AHCI_GLOBAL_CTL);
 	if (tmp & AHCI_ENABLE) {
 		tmp &= ~AHCI_ENABLE;
-		writel(tmp, mmio + AHCI_GLOBAL_CTL);
+		iowrite32(tmp, mmio + AHCI_GLOBAL_CTL);
 
-		tmp = readl(mmio + AHCI_GLOBAL_CTL);
+		tmp = ioread32(mmio + AHCI_GLOBAL_CTL);
 		if (tmp & AHCI_ENABLE)
 			rc = -EIO;
 	}