LXR linux/arch/arm/mach-s3c2410/gpio.c

   1/* linux/arch/arm/mach-s3c2410/gpio.c
   2 *
   3 * Copyright (c) 2004-2006 Simtec Electronics
   4 *      Ben Dooks <ben@simtec.co.uk>
   5 *
   6 * S3C2410 GPIO support
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#include <linux/kernel.h>
  24#include <linux/init.h>
  25#include <linux/module.h>
  26#include <linux/interrupt.h>
  27#include <linux/ioport.h>
  28#include <linux/io.h>
  29
  30#include <mach/hardware.h>
  31#include <mach/gpio-fns.h>
  32#include <asm/irq.h>
  33
  34#include <mach/regs-gpio.h>
  35
  36int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
  37                           unsigned int config)
  38{
  39        void __iomem *reg = S3C24XX_EINFLT0;
  40        unsigned long flags;
  41        unsigned long val;
  42
  43        if (pin < S3C2410_GPG(8) || pin > S3C2410_GPG(15))
  44                return -EINVAL;
  45
  46        config &= 0xff;
  47
  48        pin -= S3C2410_GPG(8);
  49        reg += pin & ~3;
  50
  51        local_irq_save(flags);
  52
  53        /* update filter width and clock source */
  54
  55        val = __raw_readl(reg);
  56        val &= ~(0xff << ((pin & 3) * 8));
  57        val |= config << ((pin & 3) * 8);
  58        __raw_writel(val, reg);
  59
  60        /* update filter enable */
  61
  62        val = __raw_readl(S3C24XX_EXTINT2);
  63        val &= ~(1 << ((pin * 4) + 3));
  64        val |= on << ((pin * 4) + 3);
  65        __raw_writel(val, S3C24XX_EXTINT2);
  66
  67        local_irq_restore(flags);
  68
  69        return 0;
  70}
  71
  72EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
  73