openwrtv4/target/linux/ar71xx/patches-3.8/007-MIPS-ath79-fix-GPIO-function-selection-for-AR934x-So.patch

From 2e6a41e0be6a09ed839e3afbe1fb413a015d8870 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Tue, 29 Jan 2013 08:19:12 +0000
Subject: [PATCH] MIPS: ath79: fix GPIO function selection for AR934x SoCs

commit 8838becdf5f7261d7f5dfbbe957fe9b9ed188aec upstream.

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>
Patchwork: http://patchwork.linux-mips.org/patch/4870/
Signed-off-by: John Crispin <blogic@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
@@ -401,6 +401,8 @@
 #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 AR7240_GPIO_COUNT		18
 #define AR7241_GPIO_COUNT		20