diff --git a/include/asm-sparc64/mostek.h b/include/asm-sparc64/mostek.h
index ccf2f5f..1f9b135 100644
--- a/include/asm-sparc64/mostek.h
+++ b/include/asm-sparc64/mostek.h
@@ -38,7 +38,7 @@
  *
  * We now deal with physical addresses for I/O to the chip. -DaveM
  */
-static __inline__ u8 mostek_read(unsigned long addr)
+static __inline__ u8 mostek_read(void * __iomem addr)
 {
 	u8 ret;
 
@@ -48,7 +48,7 @@
 	return ret;
 }
 
-static __inline__ void mostek_write(unsigned long addr, u8 val)
+static __inline__ void mostek_write(void * __iomem addr, u8 val)
 {
 	__asm__ __volatile__("stba	%0, [%1] %2"
 			     : /* no outputs */
@@ -67,7 +67,7 @@
 #define MOSTEK_YEAR		0x07ffUL
 
 extern spinlock_t mostek_lock;
-extern unsigned long mstk48t02_regs;
+extern void *__iomem mstk48t02_regs;
 
 /* Control register values. */
 #define	MSTK_CREG_WRITE	0x80	/* Must set this before placing values. */