[ARM] S3C24XX: Add gpiolib support

Add support for gpilib on all S3C24XX platforms.

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

3 files changed, 261 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/Kconfig b/arch/arm/plat-s3c24xx/Kconfig
index b66fb3c4e228..1521f1ce3b2b 100644
--- a/arch/arm/plat-s3c24xx/Kconfig
+++ b/arch/arm/plat-s3c24xx/Kconfig
@@ -9,6 +9,7 @@ config PLAT_S3C24XX
 	depends on ARCH_S3C2410
 	default y if ARCH_S3C2410
 	select NO_IOPORT
+	select HAVE_GPIO_LIB
 	help
 	  Base platform code for any Samsung S3C24XX device
 
diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile
index 131d20237dd7..b91e62585684 100644
--- a/arch/arm/plat-s3c24xx/Makefile
+++ b/arch/arm/plat-s3c24xx/Makefile
@@ -16,6 +16,7 @@ obj-y				+= cpu.o
 obj-y				+= irq.o
 obj-y				+= devs.o
 obj-y				+= gpio.o
+obj-y				+= gpiolib.o
 obj-y				+= time.o
 obj-y				+= clock.o
 
diff --git a/arch/arm/plat-s3c24xx/gpiolib.c b/arch/arm/plat-s3c24xx/gpiolib.c
new file mode 100644
index 000000000000..825d8d0c5ca2
--- /dev/null
+++ b/arch/arm/plat-s3c24xx/gpiolib.c
@@ -0,0 +1,259 @@
+/* linux/arch/arm/plat-s3c24xx/gpiolib.c
+ *
+ * Copyright (c) 2008 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX GPIOlib support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+
+#include <asm/arch/regs-gpio.h>
+
+struct s3c24xx_gpio_chip {
+	struct gpio_chip	chip;
+	void __iomem		*base;
+};
+
+static inline struct s3c24xx_gpio_chip *to_s3c_chip(struct gpio_chip *gpc)
+{
+	return container_of(gpc, struct s3c24xx_gpio_chip, chip);
+}
+
+/* these routines are exported for use by other parts of the platform
+ * and system support, but are not intended to be used directly by the
+ * drivers themsevles.
+ */
+
+int s3c24xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
+{
+	struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long flags;
+	unsigned long con;
+
+	local_irq_save(flags);
+
+	con = __raw_readl(base + 0x00);
+	con &= ~(3 << (offset * 2));
+	con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
+
+	__raw_writel(con, base + 0x00);
+
+	local_irq_restore(flags);
+	return 0;
+}
+
+int s3c24xx_gpiolib_output(struct gpio_chip *chip,
+				  unsigned offset, int value)
+{
+	struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long flags;
+	unsigned long dat;
+	unsigned long con;
+
+	local_irq_save(flags);
+
+	dat = __raw_readl(base + 0x04);
+	dat &= ~(1 << offset);
+	if (value)
+		dat |= 1 << offset;
+	__raw_writel(dat, base + 0x04);
+
+	con = __raw_readl(base + 0x00);
+	con &= ~(3 << (offset * 2));
+	con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
+
+	__raw_writel(con, base + 0x00);
+	__raw_writel(dat, base + 0x04);
+
+	local_irq_restore(flags);
+	return 0;
+}
+
+void s3c24xx_gpiolib_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long flags;
+	unsigned long dat;
+
+	local_irq_save(flags);
+
+	dat = __raw_readl(base + 0x04);
+	dat &= ~(1 << offset);
+	if (value)
+		dat |= 1 << offset;
+	__raw_writel(dat, base + 0x04);
+
+	local_irq_restore(flags);
+}
+
+int s3c24xx_gpiolib_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
+	unsigned long val;
+
+	val = __raw_readl(ourchip->base + 0x04);
+	val >>= offset;
+	val &= 1;
+
+	return val;
+}
+
+static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
+{
+	return -EINVAL;
+}
+
+static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
+					unsigned offset, int value)
+{
+	struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long flags;
+	unsigned long dat;
+	unsigned long con;
+
+	local_irq_save(flags);
+
+	con = __raw_readl(base + 0x00);
+	dat = __raw_readl(base + 0x04);
+
+	dat &= ~(1 << offset);
+	if (value)
+		dat |= 1 << offset;
+
+	__raw_writel(dat, base + 0x04);
+
+	con &= ~(1 << offset);
+
+	__raw_writel(con, base + 0x00);
+	__raw_writel(dat, base + 0x04);
+
+	local_irq_restore(flags);
+	return 0;
+}
+
+
+struct s3c24xx_gpio_chip gpios[] = {
+	[0] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPA0),
+		.chip	= {
+			.base			= S3C2410_GPA0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOA",
+			.ngpio			= 24,
+			.direction_input	= s3c24xx_gpiolib_banka_input,
+			.direction_output	= s3c24xx_gpiolib_banka_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[1] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPB0),
+		.chip	= {
+			.base			= S3C2410_GPB0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOB",
+			.ngpio			= 16,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[2] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPC0),
+		.chip	= {
+			.base			= S3C2410_GPC0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOC",
+			.ngpio			= 16,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[3] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPD0),
+		.chip	= {
+			.base			= S3C2410_GPD0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOD",
+			.ngpio			= 16,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[4] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPE0),
+		.chip	= {
+			.base			= S3C2410_GPE0,
+			.label			= "GPIOE",
+			.owner			= THIS_MODULE,
+			.ngpio			= 16,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[5] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPF0),
+		.chip	= {
+			.base			= S3C2410_GPF0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOF",
+			.ngpio			= 8,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+	[6] = {
+		.base	= S3C24XX_GPIO_BASE(S3C2410_GPG0),
+		.chip	= {
+			.base			= S3C2410_GPG0,
+			.owner			= THIS_MODULE,
+			.label			= "GPIOG",
+			.ngpio			= 10,
+			.direction_input	= s3c24xx_gpiolib_input,
+			.direction_output	= s3c24xx_gpiolib_output,
+			.set			= s3c24xx_gpiolib_set,
+			.get			= s3c24xx_gpiolib_get,
+		},
+	},
+};
+
+static __init int s3c24xx_gpiolib_init(void)
+{
+	struct s3c24xx_gpio_chip *chip = gpios;
+	int gpn;
+
+	for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
+		gpiochip_add(&chip->chip);
+
+	return 0;
+}
+
+arch_initcall(s3c24xx_gpiolib_init);