ARM: S3C24XX: Add the gpio pull configuration for pull-up

Add the necessary gpio configuration helper for the devices which
have a single-bit pull-up resistor disabled.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c2410/Kconfig

@@ -6,6 +6,7 @@ config CPU_S3C2410
 	bool
 	depends on ARCH_S3C2410
 	select CPU_ARM920T
+	select S3C_GPIO_PULL_UP
 	select S3C2410_CLOCK
 	select S3C2410_GPIO
 	select CPU_LLSERIAL_S3C2410

arch/arm/mach-s3c2410/s3c2410.c

@@ -16,6 +16,7 @@
 #include <linux/list.h>
 #include <linux/timer.h>
 #include <linux/init.h>
+#include <linux/gpio.h>
 #include <linux/clk.h>
 #include <linux/sysdev.h>
 #include <linux/serial_core.h>
@@ -40,6 +41,10 @@
 #include <plat/clock.h>
 #include <plat/pll.h>
 
+#include <plat/gpio-core.h>
+#include <plat/gpio-cfg.h>
+#include <plat/gpio-cfg-helpers.h>
+
 /* Initial IO mappings */
 
 static struct map_desc s3c2410_iodesc[] __initdata = {
@@ -65,6 +70,9 @@ void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
 
 void __init s3c2410_map_io(void)
 {
+	s3c24xx_gpiocfg_default.set_pull = s3c_gpio_setpull_1up;
+	s3c24xx_gpiocfg_default.get_pull = s3c_gpio_getpull_1up;
+
 	iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
 }
 

arch/arm/mach-s3c2440/Kconfig

@@ -6,6 +6,7 @@ config CPU_S3C2440
 	bool
 	depends on ARCH_S3C2410
 	select CPU_ARM920T
+	select S3C_GPIO_PULL_UP
 	select S3C2410_CLOCK
 	select S3C2410_PM if PM
 	select S3C2410_GPIO

arch/arm/mach-s3c2440/s3c2440.c

@@ -19,6 +19,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
 #include <linux/sysdev.h>
+#include <linux/gpio.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 
@@ -33,6 +34,10 @@
 #include <plat/cpu.h>
 #include <plat/s3c244x.h>
 
+#include <plat/gpio-core.h>
+#include <plat/gpio-cfg.h>
+#include <plat/gpio-cfg-helpers.h>
+
 static struct sys_device s3c2440_sysdev = {
 	.cls		= &s3c2440_sysclass,
 };
@@ -41,6 +46,9 @@ int __init s3c2440_init(void)
 {
 	printk("S3C2440: Initialising architecture\n");
 
+	s3c24xx_gpiocfg_default.set_pull = s3c_gpio_setpull_1up;
+	s3c24xx_gpiocfg_default.get_pull = s3c_gpio_getpull_1up;
+
 	/* change irq for watchdog */
 
 	s3c_device_wdt.resource[1].start = IRQ_S3C2440_WDT;

arch/arm/plat-samsung/gpio-config.c

@@ -164,3 +164,35 @@ s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
 	return (__force s3c_gpio_pull_t)pup;
 }
 #endif
+
+#ifdef CONFIG_S3C_GPIO_PULL_UP
+int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
+			 unsigned int off, s3c_gpio_pull_t pull)
+{
+	void __iomem *reg = chip->base + 0x08;
+	u32 pup = __raw_readl(reg);
+
+	pup = __raw_readl(reg);
+
+	if (pup == S3C_GPIO_PULL_UP)
+		pup &= ~(1 << off);
+	else if (pup == S3C_GPIO_PULL_NONE)
+		pup |= (1 << off);
+	else
+		return -EINVAL;
+
+	__raw_writel(pup, reg);
+	return 0;
+}
+
+s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
+				     unsigned int off)
+{
+	void __iomem *reg = chip->base + 0x08;
+	u32 pup = __raw_readl(reg);
+
+	pup &= (1 << off);
+	return pup ? S3C_GPIO_PULL_NONE : S3C_GPIO_PULL_UP;
+}
+#endif /* CONFIG_S3C_GPIO_PULL_UP */
+

arch/arm/plat-samsung/include/plat/gpio-cfg-helpers.h

@@ -145,6 +145,17 @@ extern int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
 extern s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
 					       unsigned int off);
 
+/**
+ * s3c_gpio_getpull_1up() - Get configuration for choice of up or none
+ * @chip: The gpio chip that the GPIO pin belongs to
+ * @off: The offset to the pin to get the configuration of.
+ *
+ * This helper function reads the state of the pull-up resistor for the
+ * given GPIO in the same case as s3c_gpio_setpull_1up.
+*/
+extern s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
+					    unsigned int off);
+
 /**
  * s3c_gpio_setpull_s3c2443() - Pull configuration for s3c2443.
  * @chip: The gpio chip that is being configured.