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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/sysdev.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/gpio.h>

#include <mach/gpio-core.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <plat/pm.h>

#include <mach/regs-gpio.h>

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 s3c_gpio_chip *ourchip = to_s3c_gpio(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 int s3c24xx_gpiolib_bankf_toirq(struct gpio_chip *chip, unsigned offset)
{
      if (offset < 4)
            return IRQ_EINT0 + offset;
      
      if (offset < 8)
            return IRQ_EINT4 + offset - 4;
      
      return -EINVAL;
}

static int s3c24xx_gpiolib_bankg_toirq(struct gpio_chip *chip, unsigned offset)
{
      return IRQ_EINT8 + offset;
}

struct s3c_gpio_chip s3c24xx_gpios[] = {
      [0] = {
            .base = S3C2410_GPACON,
            .pm   = __gpio_pm(&s3c_gpio_pm_1bit),
            .chip = {
                  .base             = S3C2410_GPA(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOA",
                  .ngpio                  = 24,
                  .direction_input  = s3c24xx_gpiolib_banka_input,
                  .direction_output = s3c24xx_gpiolib_banka_output,
            },
      },
      [1] = {
            .base = S3C2410_GPBCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPB(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOB",
                  .ngpio                  = 16,
            },
      },
      [2] = {
            .base = S3C2410_GPCCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPC(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOC",
                  .ngpio                  = 16,
            },
      },
      [3] = {
            .base = S3C2410_GPDCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPD(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOD",
                  .ngpio                  = 16,
            },
      },
      [4] = {
            .base = S3C2410_GPECON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPE(0),
                  .label                  = "GPIOE",
                  .owner                  = THIS_MODULE,
                  .ngpio                  = 16,
            },
      },
      [5] = {
            .base = S3C2410_GPFCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPF(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOF",
                  .ngpio                  = 8,
                  .to_irq                 = s3c24xx_gpiolib_bankf_toirq,
            },
      },
      [6] = {
            .base = S3C2410_GPGCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPG(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOG",
                  .ngpio                  = 16,
                  .to_irq                 = s3c24xx_gpiolib_bankg_toirq,
            },
      }, {
            .base = S3C2410_GPHCON,
            .pm   = __gpio_pm(&s3c_gpio_pm_2bit),
            .chip = {
                  .base             = S3C2410_GPH(0),
                  .owner                  = THIS_MODULE,
                  .label                  = "GPIOH",
                  .ngpio                  = 11,
            },
      },
};

static __init int s3c24xx_gpiolib_init(void)
{
      struct s3c_gpio_chip *chip = s3c24xx_gpios;
      int gpn;

      for (gpn = 0; gpn < ARRAY_SIZE(s3c24xx_gpios); gpn++, chip++)
            s3c_gpiolib_add(chip);

      return 0;
}

core_initcall(s3c24xx_gpiolib_init);

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