[ARM] 3033/1: S3C2410 - add generic gpio_cfgpin options

Patch from Ben Dooks

Add generic values for the parameters to the
s3c2410_gpio_cfgpin() function, so that a caller
does not need to know the exact constant for
the specified pin.

This is very useful for the case where a driver
is passed a gpio pin number and needs to reconfigure
the pin's function.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-s3c2410/gpio.c

@@ -30,6 +30,7 @@
  *	04-Oct-2004  BJD  Added irq filter controls for GPIO
  *	05-Nov-2004  BJD  EXPORT_SYMBOL() added for all code
  *	13-Mar-2005  BJD  Updates for __iomem
+ *	26-Oct-2005  BJD  Added generic configuration types
  */
 
 
@@ -58,6 +59,27 @@ void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
 		mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
 	}
 
+	switch (function) {
+	case S3C2410_GPIO_LEAVE:
+		mask = 0;
+		function = 0;
+		break;
+
+	case S3C2410_GPIO_INPUT:
+	case S3C2410_GPIO_OUTPUT:
+	case S3C2410_GPIO_SFN2:
+	case S3C2410_GPIO_SFN3:
+		if (pin < S3C2410_GPIO_BANKB) {
+			function &= 1;
+			function <<= S3C2410_GPIO_OFFSET(pin);
+		} else {
+			function &= 3;
+			function <<= S3C2410_GPIO_OFFSET(pin)*2;
+		}
+	}
+
+	/* modify the specified register wwith IRQs off */
+
 	local_irq_save(flags);
 
 	con  = __raw_readl(base + 0x00);

include/asm-arm/arch-s3c2410/regs-gpio.h

@@ -20,6 +20,7 @@
  *    18-11-2004     BJD     Added S3C2440 AC97 controls
  *    10-Mar-2005    LCVR    Changed S3C2410_VA to S3C24XX_VA
  *    28-Mar-2005    LCVR    Fixed definition of GPB10
+ *    26-Oct-2005    BJD     Added generic configuration types
 */
 
 
@@ -43,6 +44,11 @@
 /* general configuration options */
 
 #define S3C2410_GPIO_LEAVE   (0xFFFFFFFF)
+#define S3C2410_GPIO_INPUT   (0xFFFFFFF0)
+#define S3C2410_GPIO_OUTPUT  (0xFFFFFFF1)
+#define S3C2410_GPIO_IRQ     (0xFFFFFFF2)	/* not available for all */
+#define S3C2410_GPIO_SFN2    (0xFFFFFFF2)	/* not available on A */
+#define S3C2410_GPIO_SFN3    (0xFFFFFFF3)	/* not available on A */
 
 /* configure GPIO ports A..G */