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gpiolib.c

/* 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 <mach/hardware.h>
#include <asm/irq.h>

#include <mach/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.
 */

static 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;
}

static 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;
}

static 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);
}

static 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;
}

static 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);

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