AA: ar71xx: fix GPIO function selection for AR934x

Backport of r34275.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@34368 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 106 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-3.3/212-MIPS-ath79-fix-GPIO-function-selection-for-AR934x-So.patch b/target/linux/ar71xx/patches-3.3/212-MIPS-ath79-fix-GPIO-function-selection-for-AR934x-So.patch
new file mode 100644
index 000000000..9ffb398ea
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.3/212-MIPS-ath79-fix-GPIO-function-selection-for-AR934x-So.patch
@@ -0,0 +1,106 @@
+From 177dc53a07e2c660d1c1a6cec4576c802325e330 Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <juhosg@openwrt.org>
+Date: Wed, 14 Nov 2012 09:02:01 +0100
+Subject: [PATCH] MIPS: ath79: fix GPIO function selection for AR934x SoCs
+
+GPIO function selection is not working on the AR934x
+SoCs because the offset of the  function selection
+register is different on those.
+
+Add a helper routine which returns the correct
+register address based on the SoC type, and use
+that in the 'ath79_gpio_function_*' routines.
+
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+ arch/mips/ath79/gpio.c                         |   38 ++++++++++++++++--------
+ arch/mips/include/asm/mach-ath79/ar71xx_regs.h |    2 ++
+ 2 files changed, 28 insertions(+), 12 deletions(-)
+
+--- a/arch/mips/ath79/gpio.c
++++ b/arch/mips/ath79/gpio.c
+@@ -137,47 +137,61 @@ static struct gpio_chip ath79_gpio_chip
+ 	.base			= 0,
+ };
+ 
++static void __iomem *ath79_gpio_get_function_reg(void)
++{
++	u32 reg = 0;
++
++	if (soc_is_ar71xx() ||
++	    soc_is_ar724x() ||
++	    soc_is_ar913x() ||
++	    soc_is_ar933x())
++		reg = AR71XX_GPIO_REG_FUNC;
++	else if (soc_is_ar934x())
++		reg = AR934X_GPIO_REG_FUNC;
++	else
++		BUG();
++
++	return ath79_gpio_base + reg;
++}
++
+ void ath79_gpio_function_enable(u32 mask)
+ {
+-	void __iomem *base = ath79_gpio_base;
++	void __iomem *reg = ath79_gpio_get_function_reg();
+ 	unsigned long flags;
+ 
+ 	spin_lock_irqsave(&ath79_gpio_lock, flags);
+ 
+-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) | mask,
+-		     base + AR71XX_GPIO_REG_FUNC);
++	__raw_writel(__raw_readl(reg) | mask, reg);
+ 	/* flush write */
+-	__raw_readl(base + AR71XX_GPIO_REG_FUNC);
++	__raw_readl(reg);
+ 
+ 	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+ }
+ 
+ void ath79_gpio_function_disable(u32 mask)
+ {
+-	void __iomem *base = ath79_gpio_base;
++	void __iomem *reg = ath79_gpio_get_function_reg();
+ 	unsigned long flags;
+ 
+ 	spin_lock_irqsave(&ath79_gpio_lock, flags);
+ 
+-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~mask,
+-		     base + AR71XX_GPIO_REG_FUNC);
++	__raw_writel(__raw_readl(reg) & ~mask, reg);
+ 	/* flush write */
+-	__raw_readl(base + AR71XX_GPIO_REG_FUNC);
++	__raw_readl(reg);
+ 
+ 	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+ }
+ 
+ void ath79_gpio_function_setup(u32 set, u32 clear)
+ {
+-	void __iomem *base = ath79_gpio_base;
++	void __iomem *reg = ath79_gpio_get_function_reg();
+ 	unsigned long flags;
+ 
+ 	spin_lock_irqsave(&ath79_gpio_lock, flags);
+ 
+-	__raw_writel((__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~clear) | set,
+-		     base + AR71XX_GPIO_REG_FUNC);
++	__raw_writel((__raw_readl(reg) & ~clear) | set, reg);
+ 	/* flush write */
+-	__raw_readl(base + AR71XX_GPIO_REG_FUNC);
++	__raw_readl(reg);
+ 
+ 	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+ }
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+@@ -520,6 +520,8 @@
+ #define AR71XX_GPIO_REG_INT_ENABLE	0x24
+ #define AR71XX_GPIO_REG_FUNC		0x28
+ 
++#define AR934X_GPIO_REG_FUNC		0x6c
++
+ #define AR71XX_GPIO_COUNT		16
+ #define AR724X_GPIO_COUNT		18
+ #define AR913X_GPIO_COUNT		22