MIPS: ath79: simplify ath79_gpio_function_* routines

Make ath79_gpio_function_{en,dis}able to be wrappers
around ath79_gpio_function_setup.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4871/Signed-off-by: John Crispin <blogic@openwrt.org>

arch/mips/ath79/gpio.c

@@ -154,46 +154,28 @@ static void __iomem *ath79_gpio_get_function_reg(void)
 	return ath79_gpio_base + reg;
 }
 
-void ath79_gpio_function_enable(u32 mask)
+void ath79_gpio_function_setup(u32 set, u32 clear)
 {
 	void __iomem *reg = ath79_gpio_get_function_reg();
 	unsigned long flags;
 
 	spin_lock_irqsave(&ath79_gpio_lock, flags);
 
-	__raw_writel(__raw_readl(reg) | mask, reg);
+	__raw_writel((__raw_readl(reg) & ~clear) | set, reg);
 	/* flush write */
 	__raw_readl(reg);
 
 	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
 }
 
-void ath79_gpio_function_disable(u32 mask)
+void ath79_gpio_function_enable(u32 mask)
 {
-	void __iomem *reg = ath79_gpio_get_function_reg();
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	__raw_writel(__raw_readl(reg) & ~mask, reg);
-	/* flush write */
-	__raw_readl(reg);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+	ath79_gpio_function_setup(mask, 0);
 }
 
-void ath79_gpio_function_setup(u32 set, u32 clear)
+void ath79_gpio_function_disable(u32 mask)
 {
-	void __iomem *reg = ath79_gpio_get_function_reg();
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	__raw_writel((__raw_readl(reg) & ~clear) | set, reg);
-	/* flush write */
-	__raw_readl(reg);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+	ath79_gpio_function_setup(0, mask);
 }
 
 void __init ath79_gpio_init(void)