diff --git a/arch/h8300/include/asm/io.h b/arch/h8300/include/asm/io.h
index 1d09b2f..eed2218 100644
--- a/arch/h8300/include/asm/io.h
+++ b/arch/h8300/include/asm/io.h
@@ -6,32 +6,32 @@
 #include <asm-generic/io.h>
 
 /* H8/300 internal I/O functions */
-static inline unsigned char ctrl_inb(unsigned long addr)
+static inline unsigned char readb(unsigned long addr)
 {
 	return *(volatile unsigned char *)addr;
 }
 
-static inline unsigned short ctrl_inw(unsigned long addr)
+static inline unsigned short readw(unsigned long addr)
 {
 	return *(volatile unsigned short *)addr;
 }
 
-static inline unsigned long ctrl_inl(unsigned long addr)
+static inline unsigned long readl(unsigned long addr)
 {
 	return *(volatile unsigned long *)addr;
 }
 
-static inline void ctrl_outb(unsigned char b, unsigned long addr)
+static inline void writeb(unsigned char b, unsigned long addr)
 {
 	*(volatile unsigned char *)addr = b;
 }
 
-static inline void ctrl_outw(unsigned short b, unsigned long addr)
+static inline void writew(unsigned short b, unsigned long addr)
 {
 	*(volatile unsigned short *)addr = b;
 }
 
-static inline void ctrl_outl(unsigned long b, unsigned long addr)
+static inline void writel(unsigned long b, unsigned long addr)
 {
 	*(volatile unsigned long *)addr = b;
 }
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
index 0fd1fe6..9b92aea 100644
--- a/arch/h8300/kernel/setup.c
+++ b/arch/h8300/kernel/setup.c
@@ -206,14 +206,14 @@ device_initcall(device_probe);
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 2);			     \
-	w *= (ctrl_inw((unsigned long)(base) + 2) & (3 << baddr)) + 1;	\
+	w *= (readw((unsigned long)(base) + 2) & (3 << baddr)) + 1;	\
 	})
 #endif
 #if defined(CONFIG_CPU_H8S)
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 16);			     \
-	w *= (ctrl_inl((unsigned long)(base) + 2) & (7 << baddr)) + 1;	\
+	w *= (readl((unsigned long)(base) + 2) & (7 << baddr)) + 1;	\
 	})
 #endif
 
@@ -227,8 +227,8 @@ static __init int access_timing(void)
 
 	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 	base = of_iomap(bsc, 0);
-	w = (ctrl_inb((unsigned long)base + 0) & bit)?2:1;
-	if (ctrl_inb((unsigned long)base + 1) & bit)
+	w = (readb((unsigned long)base + 0) & bit)?2:1;
+	if (readb((unsigned long)base + 1) & bit)
 		w *= get_wait(base, addr);
 	else
 		w *= 2;
diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index cdf0d83..2472da1 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -69,15 +69,15 @@ static unsigned long timer16_get_counter(struct timer16_priv *p)
 	unsigned long v1, v2, v3;
 	int o1, o2;
 
-	o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
+	o1 = readb(p->mapcommon + TISRC) & p->ovf;
 
 	/* Make sure the timer value is stable. Stolen from acpi_pm.c */
 	do {
 		o2 = o1;
-		v1 = ctrl_inw(p->mapbase + TCNT);
-		v2 = ctrl_inw(p->mapbase + TCNT);
-		v3 = ctrl_inw(p->mapbase + TCNT);
-		o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
+		v1 = readw(p->mapbase + TCNT);
+		v2 = readw(p->mapbase + TCNT);
+		v3 = readw(p->mapbase + TCNT);
+		o1 = readb(p->mapcommon + TISRC) & p->ovf;
 	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
 			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
 
@@ -90,7 +90,7 @@ static irqreturn_t timer16_interrupt(int irq, void *dev_id)
 {
 	struct timer16_priv *p = (struct timer16_priv *)dev_id;
 
-	ctrl_outb(ctrl_inb(p->mapcommon + TISRA) & ~p->imfa,
+	writeb(readb(p->mapcommon + TISRA) & ~p->imfa,
 		  p->mapcommon + TISRA);
 	p->total_cycles += 0x10000;
 
@@ -123,9 +123,9 @@ static int timer16_enable(struct clocksource *cs)
 	WARN_ON(p->cs_enabled);
 
 	p->total_cycles = 0;
-	ctrl_outw(0x0000, p->mapbase + TCNT);
-	ctrl_outb(0x83, p->mapbase + TCR);
-	ctrl_outb(ctrl_inb(p->mapcommon + TSTR) | p->enb,
+	writew(0x0000, p->mapbase + TCNT);
+	writeb(0x83, p->mapbase + TCR);
+	writeb(readb(p->mapcommon + TSTR) | p->enb,
 		  p->mapcommon + TSTR);
 
 	p->cs_enabled = true;
@@ -138,7 +138,7 @@ static void timer16_disable(struct clocksource *cs)
 
 	WARN_ON(!p->cs_enabled);
 
-	ctrl_outb(ctrl_inb(p->mapcommon + TSTR) & ~p->enb,
+	writeb(readb(p->mapcommon + TSTR) & ~p->enb,
 		  p->mapcommon + TSTR);
 
 	p->cs_enabled = false;
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 0885014..cf0feee 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -42,15 +42,15 @@ static unsigned long timer8_get_counter(struct timer8_priv *p)
 	unsigned long v1, v2, v3;
 	int o1, o2;
 
-	o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
+	o1 = readb(p->mapbase + _8TCSR) & 0x20;
 
 	/* Make sure the timer value is stable. Stolen from acpi_pm.c */
 	do {
 		o2 = o1;
-		v1 = ctrl_inw(p->mapbase + _8TCNT);
-		v2 = ctrl_inw(p->mapbase + _8TCNT);
-		v3 = ctrl_inw(p->mapbase + _8TCNT);
-		o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
+		v1 = readw(p->mapbase + _8TCNT);
+		v2 = readw(p->mapbase + _8TCNT);
+		v3 = readw(p->mapbase + _8TCNT);
+		o1 = readb(p->mapbase + _8TCSR) & 0x20;
 	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
 			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
 
@@ -62,13 +62,13 @@ static irqreturn_t timer8_interrupt(int irq, void *dev_id)
 {
 	struct timer8_priv *p = dev_id;
 
-	ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~0x40,
+	writeb(readb(p->mapbase + _8TCSR) & ~0x40,
 		  p->mapbase + _8TCSR);
 
-	ctrl_outw(p->tcora, p->mapbase + TCORA);
+	writew(p->tcora, p->mapbase + TCORA);
 
 	if (clockevent_state_oneshot(&p->ced))
-		ctrl_outw(0x0000, p->mapbase + _8TCR);
+		writew(0x0000, p->mapbase + _8TCR);
 
 	p->ced.event_handler(&p->ced);
 
@@ -83,19 +83,19 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 		dev_warn(&p->pdev->dev, "delta out of range\n");
 	now = timer8_get_counter(p);
 	p->tcora = delta;
-	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);
+	writeb(readb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);
 	if (delta > now)
-		ctrl_outw(delta, p->mapbase + TCORA);
+		writew(delta, p->mapbase + TCORA);
 	else
-		ctrl_outw(now + 1, p->mapbase + TCORA);
+		writew(now + 1, p->mapbase + TCORA);
 }
 
 static int timer8_enable(struct timer8_priv *p)
 {
 	p->rate = clk_get_rate(p->pclk) / SCALE;
-	ctrl_outw(0xffff, p->mapbase + TCORA);
-	ctrl_outw(0x0000, p->mapbase + _8TCNT);
-	ctrl_outw(0x0c02, p->mapbase + _8TCR);
+	writew(0xffff, p->mapbase + TCORA);
+	writew(0x0000, p->mapbase + _8TCNT);
+	writew(0x0c02, p->mapbase + _8TCR);
 
 	return 0;
 }
@@ -117,7 +117,7 @@ static int timer8_start(struct timer8_priv *p)
 
 static void timer8_stop(struct timer8_priv *p)
 {
-	ctrl_outw(0x0000, p->mapbase + _8TCR);
+	writew(0x0000, p->mapbase + _8TCR);
 }
 
 static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
index c1eef42..1f67a38 100644
--- a/drivers/clocksource/h8300_tpu.c
+++ b/drivers/clocksource/h8300_tpu.c
@@ -31,8 +31,8 @@ static inline unsigned long read_tcnt32(struct tpu_priv *p)
 {
 	unsigned long tcnt;
 
-	tcnt = ctrl_inw(p->mapbase1 + TCNT) << 16;
-	tcnt |= ctrl_inw(p->mapbase2 + TCNT);
+	tcnt = readw(p->mapbase1 + TCNT) << 16;
+	tcnt |= readw(p->mapbase2 + TCNT);
 	return tcnt;
 }
 
@@ -41,7 +41,7 @@ static int tpu_get_counter(struct tpu_priv *p, unsigned long long *val)
 	unsigned long v1, v2, v3;
 	int o1, o2;
 
-	o1 = ctrl_inb(p->mapbase1 + TSR) & 0x10;
+	o1 = readb(p->mapbase1 + TSR) & 0x10;
 
 	/* Make sure the timer value is stable. Stolen from acpi_pm.c */
 	do {
@@ -49,7 +49,7 @@ static int tpu_get_counter(struct tpu_priv *p, unsigned long long *val)
 		v1 = read_tcnt32(p);
 		v2 = read_tcnt32(p);
 		v3 = read_tcnt32(p);
-		o1 = ctrl_inb(p->mapbase1 + TSR) & 0x10;
+		o1 = readb(p->mapbase1 + TSR) & 0x10;
 	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
 			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
 
@@ -82,10 +82,10 @@ static int tpu_clocksource_enable(struct clocksource *cs)
 
 	WARN_ON(p->cs_enabled);
 
-	ctrl_outw(0, p->mapbase1 + TCNT);
-	ctrl_outw(0, p->mapbase2 + TCNT);
-	ctrl_outb(0x0f, p->mapbase1 + TCR);
-	ctrl_outb(0x03, p->mapbase2 + TCR);
+	writew(0, p->mapbase1 + TCNT);
+	writew(0, p->mapbase2 + TCNT);
+	writeb(0x0f, p->mapbase1 + TCR);
+	writeb(0x03, p->mapbase2 + TCR);
 
 	p->cs_enabled = true;
 	return 0;
@@ -97,8 +97,8 @@ static void tpu_clocksource_disable(struct clocksource *cs)
 
 	WARN_ON(!p->cs_enabled);
 
-	ctrl_outb(0, p->mapbase1 + TCR);
-	ctrl_outb(0, p->mapbase2 + TCR);
+	writeb(0, p->mapbase1 + TCR);
+	writeb(0, p->mapbase2 + TCR);
 	p->cs_enabled = false;
 }
 
