ar71xx: add function to access the GPIO function2 register

Add access to the function2 gpio register. This probably has to be
converted into a pimux driver later on. This is needed for some setup
functions on the Arduino Yun.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 47449

target/linux/ar71xx/patches-4.1/820-MIPS-ath79-add_gpio_function2_setup.patch

@@ -0,0 +1,72 @@
+Add access to the function2 gpio register. This probably has to be
+converted into a pimux driver later on. This is needed for some setup
+functions on the Arduino Yun.
+
+--- a/arch/mips/ath79/common.h
++++ b/arch/mips/ath79/common.h
+@@ -27,6 +27,7 @@ void ath79_ddr_wb_flush(unsigned int reg
+ void ath79_gpio_function_enable(u32 mask);
+ void ath79_gpio_function_disable(u32 mask);
+ void ath79_gpio_function_setup(u32 set, u32 clear);
++void ath79_gpio_function2_setup(u32 set, u32 clear);
+ void ath79_gpio_output_select(unsigned gpio, u8 val);
+ int ath79_gpio_direction_select(unsigned gpio, bool oe);
+ void ath79_gpio_init(void);
+--- a/arch/mips/ath79/gpio.c
++++ b/arch/mips/ath79/gpio.c
+@@ -193,6 +193,36 @@ static void __iomem *ath79_gpio_get_func
+ 	return ath79_gpio_base + reg;
+ }
+ 
++static void __iomem *ath79_gpio_get_function2_reg(void)
++{
++	u32 reg = 0;
++
++	if (soc_is_ar71xx() ||
++	    soc_is_ar724x() ||
++	    soc_is_ar913x() ||
++	    soc_is_ar933x())
++		reg = AR71XX_GPIO_REG_FUNC_2;
++	else
++		BUG();
++
++	return ath79_gpio_base + reg;
++}
++
++
++void ath79_gpio_function2_setup(u32 set, u32 clear)
++{
++	void __iomem *reg = ath79_gpio_get_function2_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);
++}
++
+ void ath79_gpio_function_setup(u32 set, u32 clear)
+ {
+ 	void __iomem *reg = ath79_gpio_get_function_reg();
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+@@ -840,6 +840,7 @@
+ #define AR71XX_GPIO_REG_INT_PENDING	0x20
+ #define AR71XX_GPIO_REG_INT_ENABLE	0x24
+ #define AR71XX_GPIO_REG_FUNC		0x28
++#define AR71XX_GPIO_REG_FUNC_2		0x30
+ 
+ #define AR934X_GPIO_REG_OUT_FUNC0	0x2c
+ #define AR934X_GPIO_REG_OUT_FUNC1	0x30
+@@ -964,6 +965,8 @@
+ #define AR724X_GPIO_FUNC_UART_EN		BIT(1)
+ #define AR724X_GPIO_FUNC_JTAG_DISABLE		BIT(0)
+ 
++#define AR933X_GPIO_FUNC2_JUMPSTART_DISABLE 	BIT(9)
++
+ #define AR913X_GPIO_FUNC_WMAC_LED_EN		BIT(22)
+ #define AR913X_GPIO_FUNC_EXP_PORT_CS_EN		BIT(21)
+ #define AR913X_GPIO_FUNC_I2S_REFCLKEN		BIT(20)