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