1/* linux/arch/arm/plat-s3c24xx/gpio.c 2 * 3 * Copyright (c) 2004-2010 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * S3C24XX 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/gpio.h> 29#include <linux/io.h> 30 31#include <mach/hardware.h> 32#include <mach/gpio-fns.h> 33#include <asm/irq.h> 34 35#include <mach/regs-gpio.h> 36 37#include <plat/gpio-core.h> 38 39/* gpiolib wrappers until these are totally eliminated */ 40 41void s3c2410_gpio_pullup(unsigned int pin, unsigned int to) 42{ 43 int ret; 44 45 WARN_ON(to); /* should be none of these left */ 46 47 if (!to) { 48 /* if pull is enabled, try first with up, and if that 49 * fails, try using down */ 50 51 ret = s3c_gpio_setpull(pin, S3C_GPIO_PULL_UP); 52 if (ret) 53 s3c_gpio_setpull(pin, S3C_GPIO_PULL_DOWN); 54 } else { 55 s3c_gpio_setpull(pin, S3C_GPIO_PULL_NONE); 56 } 57} 58EXPORT_SYMBOL(s3c2410_gpio_pullup); 59 60void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) 61{ 62 /* do this via gpiolib until all users removed */ 63 64 gpio_request(pin, "temporary"); 65 gpio_set_value(pin, to); 66 gpio_free(pin); 67} 68 69EXPORT_SYMBOL(s3c2410_gpio_setpin); 70 71unsigned int s3c2410_gpio_getpin(unsigned int pin) 72{ 73 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); 74 unsigned long offs = pin - chip->chip.base; 75 76 return __raw_readl(chip->base + 0x04) & (1<< offs); 77} 78 79EXPORT_SYMBOL(s3c2410_gpio_getpin); 80 81unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change) 82{ 83 unsigned long flags; 84 unsigned long misccr; 85 86 local_irq_save(flags); 87 misccr = __raw_readl(S3C24XX_MISCCR); 88 misccr &= ~clear; 89 misccr ^= change; 90 __raw_writel(misccr, S3C24XX_MISCCR); 91 local_irq_restore(flags); 92 93 return misccr; 94} 95 96EXPORT_SYMBOL(s3c2410_modify_misccr); 97