ar71xx: Add kernel 4.9 support

This add support for kernel 4.9 to the ar71xx target.
It was compile tested with the generic, NAND and mikrotik subtarget.
Multiple members of the community tested it on their boards and did not
report any major problem so far.

Especially the NAND part received some changes to adapt to the new
kernel APIs. The serial driver hack used for the Arduino Yun was not
ported because the kernel changed there a lot.

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

1 files changed, 67 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/820-MIPS-ath79-add_gpio_function2_setup.patch b/target/linux/ar71xx/patches-4.9/820-MIPS-ath79-add_gpio_function2_setup.patch
new file mode 100644
index 0000000000..afa7b69b43
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/820-MIPS-ath79-add_gpio_function2_setup.patch
@@ -0,0 +1,67 @@
+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
+@@ -29,6 +29,7 @@ void ath79_ddr_ctrl_init(void);
+ 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
+@@ -43,6 +43,31 @@ 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();
++
++	__raw_writel((__raw_readl(reg) & ~clear) | set, reg);
++	/* flush write */
++	__raw_readl(reg);
++}
++
+ 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
+@@ -865,6 +865,7 @@
+ #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
+@@ -989,6 +990,8 @@
+ #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)