ar71xx: add a function for selecting output signal on a given GPIO pin

SVN-Revision: 29125

target/linux/ar71xx/files/arch/mips/ar71xx/gpio.c

@@ -207,6 +207,37 @@ void ar71xx_gpio_function_setup(u32 set, u32 clear)
 }
 EXPORT_SYMBOL(ar71xx_gpio_function_setup);
 
+void __init ar71xx_gpio_output_select(unsigned gpio, u8 val)
+{
+	void __iomem *base = ar71xx_gpio_base;
+	unsigned long flags;
+	unsigned int reg;
+	u32 t, s;
+
+	if (ar71xx_soc != AR71XX_SOC_AR9341 &&
+	    ar71xx_soc != AR71XX_SOC_AR9342 &&
+	    ar71xx_soc != AR71XX_SOC_AR9344)
+		return;
+
+	if (gpio >= AR934X_GPIO_COUNT)
+		return;
+
+	reg = AR934X_GPIO_REG_OUT_FUNC0 + 4 * (gpio / 4);
+	s = 8 * (gpio % 4);
+
+	spin_lock_irqsave(&ar71xx_gpio_lock, flags);
+
+	t = __raw_readl(base + reg);
+	t &= ~(0xff << s);
+	t |= val << s;
+	__raw_writel(t, base + reg);
+
+	/* flush write */
+	(void) __raw_readl(base + reg);
+
+	spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
+}
+
 void __init ar71xx_gpio_init(void)
 {
 	int err;

target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h

@@ -430,6 +430,12 @@ static inline u32 ar71xx_usb_ctrl_rr(unsigned reg)
 #define AR71XX_GPIO_REG_INT_ENABLE	0x24
 #define AR71XX_GPIO_REG_FUNC		0x28
 
+#define AR934X_GPIO_REG_OUT_FUNC0	0x2c
+#define AR934X_GPIO_REG_OUT_FUNC1	0x30
+#define AR934X_GPIO_REG_OUT_FUNC2	0x34
+#define AR934X_GPIO_REG_OUT_FUNC3	0x38
+#define AR934X_GPIO_REG_OUT_FUNC4	0x3c
+#define AR934X_GPIO_REG_OUT_FUNC5	0x40
 #define AR934X_GPIO_REG_FUNC		0x6c
 
 #define AR71XX_GPIO_FUNC_STEREO_EN	BIT(17)
@@ -499,6 +505,7 @@ void ar71xx_gpio_init(void) __init;
 void ar71xx_gpio_function_enable(u32 mask);
 void ar71xx_gpio_function_disable(u32 mask);
 void ar71xx_gpio_function_setup(u32 set, u32 clear);
+void ar71xx_gpio_output_select(unsigned gpio, u8 val);
 
 /*
  * DDR_CTRL block