diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index e47a28271f5b..43f11d991df2 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -84,8 +84,8 @@ static const char* macio_ata_names[] = {
  */
 
 /* Number of IDE_SYSCLK_NS ticks, argument is in nanoseconds */
-#define SYSCLK_TICKS(t)		(((t) + IDE_SYSCLK_NS - 1) / IDE_SYSCLK_NS)
-#define SYSCLK_TICKS_66(t)	(((t) + IDE_SYSCLK_66_NS - 1) / IDE_SYSCLK_66_NS)
+#define SYSCLK_TICKS(t)		DIV_ROUND_UP(t, IDE_SYSCLK_NS)
+#define SYSCLK_TICKS_66(t)	DIV_ROUND_UP(t, IDE_SYSCLK_66_NS)
 #define IDE_SYSCLK_NS		30	/* 33Mhz cell */
 #define IDE_SYSCLK_66_NS	15	/* 66Mhz cell */