MIPS: BCM63xx: Fix GPIO set/get for BCM6345

On BCM6345, the register offsets for the set/get GPIO registers is wrong.
Use the same logic as the one present in arch/mips/bcm63xx/irq.c to
define the correct gpio_out_low_reg value when support for BCM6345
is compiled in.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3010/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/bcm63xx/gpio.c

@@ -4,7 +4,7 @@
  * for more details.
  *
  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
- * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
+ * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
  */
 
 #include <linux/kernel.h>
@@ -18,6 +18,34 @@
 #include <bcm63xx_io.h>
 #include <bcm63xx_regs.h>
 
+#ifndef BCMCPU_RUNTIME_DETECT
+#define gpio_out_low_reg	GPIO_DATA_LO_REG
+#ifdef CONFIG_BCM63XX_CPU_6345
+#ifdef gpio_out_low_reg
+#undef gpio_out_low_reg
+#define gpio_out_low_reg	GPIO_DATA_LO_REG_6345
+#endif /* gpio_out_low_reg */
+#endif /* CONFIG_BCM63XX_CPU_6345 */
+
+static inline void bcm63xx_gpio_out_low_reg_init(void)
+{
+}
+#else /* ! BCMCPU_RUNTIME_DETECT */
+static u32 gpio_out_low_reg;
+
+static void bcm63xx_gpio_out_low_reg_init(void)
+{
+	switch (bcm63xx_get_cpu_id()) {
+	case BCM6345_CPU_ID:
+		gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
+		break;
+	default:
+		gpio_out_low_reg = GPIO_DATA_LO_REG;
+		break;
+	}
+}
+#endif /* ! BCMCPU_RUNTIME_DETECT */
+
 static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
 static u32 gpio_out_low, gpio_out_high;
 
@@ -33,7 +61,7 @@ static void bcm63xx_gpio_set(struct gpio_chip *chip,
 		BUG();
 
 	if (gpio < 32) {
-		reg = GPIO_DATA_LO_REG;
+		reg = gpio_out_low_reg;
 		mask = 1 << gpio;
 		v = &gpio_out_low;
 	} else {
@@ -60,7 +88,7 @@ static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
 		BUG();
 
 	if (gpio < 32) {
-		reg = GPIO_DATA_LO_REG;
+		reg = gpio_out_low_reg;
 		mask = 1 << gpio;
 	} else {
 		reg = GPIO_DATA_HI_REG;
@@ -125,8 +153,11 @@ static struct gpio_chip bcm63xx_gpio_chip = {
 
 int __init bcm63xx_gpio_init(void)
 {
-	gpio_out_low = bcm_gpio_readl(GPIO_DATA_LO_REG);
-	gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
+	bcm63xx_gpio_out_low_reg_init();
+
+	gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
+	if (!BCMCPU_IS_6345())
+		gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
 	bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
 	pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
 

arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h

@@ -437,6 +437,7 @@
 #define GPIO_CTL_LO_REG			0x4
 #define GPIO_DATA_HI_REG		0x8
 #define GPIO_DATA_LO_REG		0xC
+#define GPIO_DATA_LO_REG_6345		0x8
 
 /* GPIO mux registers and constants */
 #define GPIO_MODE_REG			0x18