arch/arm/mach-s3c2412/gpio.c

   1 /* linux/arch/arm/mach-s3c2412/gpio.c
   2  *
   3  * Copyright (c) 2007 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://armlinux.simtec.co.uk/.
   7  *
   8  * S3C2412/S3C2413 specific GPIO support
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/module.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/gpio.h>
  20
  21 #include <asm/mach/arch.h>
  22 #include <asm/mach/map.h>
  23
  24 #include <mach/regs-gpio.h>
  25 #include <mach/hardware.h>
  26
  27 #include <plat/gpio-core.h>
  28
  29 int s3c2412_gpio_set_sleepcfg(unsigned int pin, unsigned int state)
  30 {
  31         struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
  32         unsigned long offs = pin - chip->chip.base;
  33         unsigned long flags;
  34         unsigned long slpcon;
  35
  36         offs *= 2;
  37
  38         if (pin < S3C2410_GPB(0))
  39                 return -EINVAL;
  40
  41         if (pin >= S3C2410_GPF(0) &&
  42             pin <= S3C2410_GPG(16))
  43                 return -EINVAL;
  44
  45         if (pin > S3C2410_GPH(16))
  46                 return -EINVAL;
  47
  48         local_irq_save(flags);
  49
  50         slpcon = __raw_readl(chip->base + 0x0C);
  51
  52         slpcon &= ~(3 << offs);
  53         slpcon |= state << offs;
  54
  55         __raw_writel(slpcon, chip->base + 0x0C);
  56
  57         local_irq_restore(flags);
  58
  59         return 0;
  60 }
  61
  62 EXPORT_SYMBOL(s3c2412_gpio_set_sleepcfg);