diff --git a/cpu/arm920t/s3c24x0/usb_ohci.c b/cpu/arm920t/s3c24x0/usb_ohci.c
index 4075f2e1834967d0bb2033fa7446a64ffbeceaeb..96e43d0fa688b58fbae476588ffe650dcc8e8efc 100644
--- a/cpu/arm920t/s3c24x0/usb_ohci.c
+++ b/cpu/arm920t/s3c24x0/usb_ohci.c
@@ -58,8 +58,8 @@
 #define	OHCI_CONTROL_INIT \
 	(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE
 
-#define readl(a) (*((vu_long *)(a)))
-#define writel(a, b) (*((vu_long *)(b)) = ((vu_long)a))
+#define readl(a) (*((volatile u32 *)(a)))
+#define writel(a, b) (*((volatile u32 *)(b)) = ((volatile u32)a))
 
 #define min_t(type,x,y) ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 
diff --git a/cpu/mpc5xxx/usb_ohci.c b/cpu/mpc5xxx/usb_ohci.c
index c774da36d16fffca657dba30912624fe5af51f2c..2ad12b2a25931d616e076635de199594669f4da8 100644
--- a/cpu/mpc5xxx/usb_ohci.c
+++ b/cpu/mpc5xxx/usb_ohci.c
@@ -56,8 +56,8 @@
 #define OHCI_CONTROL_INIT \
 	(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE
 
-#define readl(a) (*((vu_long *)(a)))
-#define writel(a, b) (*((vu_long *)(b)) = ((vu_long)a))
+#define readl(a) (*((volatile u32 *)(a)))
+#define writel(a, b) (*((volatile u32 *)(b)) = ((volatile u32)a))
 
 #define min_t(type,x,y) ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 
diff --git a/cpu/ppc4xx/usb_ohci.c b/cpu/ppc4xx/usb_ohci.c
index c71a6a9d85a7adabecaab0306b275e3c3c7b147d..7dbb288ebf0ff4785d7f3dd116346912276a1b6f 100644
--- a/cpu/ppc4xx/usb_ohci.c
+++ b/cpu/ppc4xx/usb_ohci.c
@@ -56,8 +56,8 @@
 #define OHCI_CONTROL_INIT \
 	(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE
 
-#define readl(a) (*((vu_long *)(a)))
-#define writel(a, b) (*((vu_long *)(b)) = ((vu_long)a))
+#define readl(a) (*((volatile u32 *)(a)))
+#define writel(a, b) (*((volatile u32 *)(b)) = ((volatile u32)a))
 
 #define min_t(type,x,y) ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })