mirror of https://gitee.com/openkylin/linux.git
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* linux/arch/arm/plat-s3c24xx/gpio.c
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*
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* Copyright (c) 2004-2010 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX GPIO support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/gpio-fns.h>
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#include <asm/irq.h>
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#include <mach/regs-gpio.h>
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#include <plat/gpio-core.h>
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/* gpiolib wrappers until these are totally eliminated */
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void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
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{
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int ret;
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WARN_ON(to); /* should be none of these left */
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if (!to) {
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/* if pull is enabled, try first with up, and if that
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* fails, try using down */
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ret = s3c_gpio_setpull(pin, S3C_GPIO_PULL_UP);
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if (ret)
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s3c_gpio_setpull(pin, S3C_GPIO_PULL_DOWN);
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} else {
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s3c_gpio_setpull(pin, S3C_GPIO_PULL_NONE);
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}
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}
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EXPORT_SYMBOL(s3c2410_gpio_pullup);
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void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
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{
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/* do this via gpiolib until all users removed */
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gpio_request(pin, "temporary");
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gpio_set_value(pin, to);
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gpio_free(pin);
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}
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EXPORT_SYMBOL(s3c2410_gpio_setpin);
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unsigned int s3c2410_gpio_getpin(unsigned int pin)
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{
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struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
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unsigned long offs = pin - chip->chip.base;
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return __raw_readl(chip->base + 0x04) & (1<< offs);
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}
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EXPORT_SYMBOL(s3c2410_gpio_getpin);
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unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
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{
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unsigned long flags;
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unsigned long misccr;
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local_irq_save(flags);
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misccr = __raw_readl(S3C24XX_MISCCR);
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misccr &= ~clear;
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misccr ^= change;
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__raw_writel(misccr, S3C24XX_MISCCR);
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local_irq_restore(flags);
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return misccr;
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}
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EXPORT_SYMBOL(s3c2410_modify_misccr);
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