ARM: S5PC1xx: add gpiolib and external/gpio interrupt support

Add support for gpiolib calls. This is based on the gpiolib implementation
from plat-s3c64xx tree.
Add support for external interrupts for GPIO H banks.
Add support for GPIO interrupts for all banks.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/plat-s3c/Kconfig

@@ -159,6 +159,12 @@ config S3C_GPIO_CFG_S3C64XX
 	  Internal configuration to enable S3C64XX style GPIO configuration
 	  functions.
 
+config S5P_GPIO_CFG_S5PC1XX
+	bool
+	help
+	  Internal configuration to enable S5PC1XX style GPIO configuration
+	  functions.
+
 # DMA
 
 config S3C_DMA

arch/arm/plat-s5pc1xx/Kconfig

@@ -15,6 +15,9 @@ config PLAT_S5PC1XX
 	select ARCH_REQUIRE_GPIOLIB
 	select S3C_GPIO_TRACK
 	select S3C_GPIO_PULL_UPDOWN
+	select S3C_GPIO_CFG_S3C24XX
+	select S3C_GPIO_CFG_S3C64XX
+	select S5P_GPIO_CFG_S5PC1XX
 	help
 	  Base platform code for any Samsung S5PC1XX device
 

arch/arm/plat-s5pc1xx/Makefile

@@ -13,8 +13,9 @@ obj-				:=
 
 obj-y				+= dev-uart.o
 obj-y				+= cpu.o
-obj-y				+= irq.o
+obj-y				+= irq.o irq-gpio.o irq-eint.o
 obj-y				+= clock.o
+obj-y				+= gpiolib.o
 
 # CPU support
 
@@ -23,5 +24,6 @@ obj-$(CONFIG_CPU_S5PC100_CLOCK)	+= s5pc100-clock.o
 
 # Device setup
 
+obj-$(CONFIG_S5P_GPIO_CFG_S5PC1XX) += gpio-config.o
 obj-$(CONFIG_S5PC100_SETUP_I2C0) += setup-i2c0.o
 obj-$(CONFIG_S5PC100_SETUP_I2C1) += setup-i2c1.o

arch/arm/plat-s5pc1xx/cpu.c

@@ -59,6 +59,11 @@ static struct map_desc s5pc1xx_iodesc[] __initdata = {
 		.pfn		= __phys_to_pfn(S5PC1XX_PA_CLK_OTHER),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5PC1XX_VA_GPIO,
+		.pfn		= __phys_to_pfn(S5PC100_PA_GPIO),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5PC1XX_VA_CHIPID,
 		.pfn		= __phys_to_pfn(S5PC1XX_PA_CHIPID),

arch/arm/plat-s5pc1xx/gpio-config.c

@@ -0,0 +1,62 @@
+/* linux/arch/arm/plat-s5pc1xx/gpio-config.c
+ *
+ * Copyright 2009 Samsung Electronics
+ *
+ * S5PC1XX GPIO Configuration.
+ *
+ * Based on plat-s3c64xx/gpio-config.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <mach/gpio-core.h>
+#include <plat/gpio-cfg-s5pc1xx.h>
+
+s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin, unsigned int off)
+{
+	struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
+	void __iomem *reg;
+	int shift = off * 2;
+	u32 drvstr;
+
+	if (!chip)
+		return -EINVAL;
+
+	reg = chip->base + 0x0C;
+
+	drvstr = __raw_readl(reg);
+	drvstr = 0xffff & (0x3 << shift);
+	drvstr = drvstr >> shift;
+
+	return (__force s5p_gpio_drvstr_t)drvstr;
+}
+EXPORT_SYMBOL(s5p_gpio_get_drvstr);
+
+int s5p_gpio_set_drvstr(unsigned int pin, unsigned int off,
+			s5p_gpio_drvstr_t drvstr)
+{
+	struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
+	void __iomem *reg;
+	int shift = off * 2;
+	u32 tmp;
+
+	if (!chip)
+		return -EINVAL;
+
+	reg = chip->base + 0x0C;
+
+	tmp = __raw_readl(reg);
+	tmp |= drvstr << shift;
+
+	__raw_writel(tmp, reg);
+
+	return 0;
+}
+EXPORT_SYMBOL(s5p_gpio_set_drvstr);