[deliverable/linux.git] / arch / arm / plat-s3c24xx / gpio.c

/* linux/arch/arm/plat-s3c24xx/gpio.c
 *
 * Copyright (c) 2004-2010 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C24XX GPIO support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/gpio.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <mach/gpio-fns.h>
#include <asm/irq.h>

#include <mach/regs-gpio.h>

#include <plat/gpio-core.h>

/* gpiolib wrappers until these are totally eliminated */

void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
{
	int ret;

	WARN_ON(to);	/* should be none of these left */

	if (!to) {
		/* if pull is enabled, try first with up, and if that
		 * fails, try using down */

		ret = s3c_gpio_setpull(pin, S3C_GPIO_PULL_UP);
		if (ret)
			s3c_gpio_setpull(pin, S3C_GPIO_PULL_DOWN);
	} else {
		s3c_gpio_setpull(pin, S3C_GPIO_PULL_NONE);
	}
}
EXPORT_SYMBOL(s3c2410_gpio_pullup);

void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
{
	/* do this via gpiolib until all users removed */

	gpio_request(pin, "temporary");
	gpio_set_value(pin, to);
	gpio_free(pin);
}

EXPORT_SYMBOL(s3c2410_gpio_setpin);

unsigned int s3c2410_gpio_getpin(unsigned int pin)
{
	struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
	unsigned long offs = pin - chip->chip.base;

	return __raw_readl(chip->base + 0x04) & (1<< offs);
}

EXPORT_SYMBOL(s3c2410_gpio_getpin);

unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
{
	unsigned long flags;
	unsigned long misccr;

	local_irq_save(flags);
	misccr = __raw_readl(S3C24XX_MISCCR);
	misccr &= ~clear;
	misccr ^= change;
	__raw_writel(misccr, S3C24XX_MISCCR);
	local_irq_restore(flags);

	return misccr;
}

EXPORT_SYMBOL(s3c2410_modify_misccr);
Commit	Line	Data
a21765a7 BD	1	/* linux/arch/arm/plat-s3c24xx/gpio.c
a21765a7 BD	2	*
31da46d9	3	* Copyright (c) 2004-2010 Simtec Electronics
a21765a7 BD	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
a21765a7 BD	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>
31da46d9	28	#include <linux/gpio.h>
fced80c7	29	#include <linux/io.h>
a21765a7	30
a09e64fb	31	#include <mach/hardware.h>
365854af	32	#include <mach/gpio-fns.h>
a21765a7	33	#include <asm/irq.h>
a21765a7	34
a09e64fb	35	#include <mach/regs-gpio.h>
a21765a7	36
7987bd7a BD	37	#include <plat/gpio-core.h>
7987bd7a BD	38
31da46d9 BD	39	/* gpiolib wrappers until these are totally eliminated */
31da46d9 BD	40
a21765a7 BD	41	void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
a21765a7 BD	42	{
31da46d9	43	int ret;
a21765a7	44
31da46d9	45	WARN_ON(to); /* should be none of these left */
a21765a7	46
31da46d9 BD	47	if (!to) {
	48	/* if pull is enabled, try first with up, and if that
	49	* fails, try using down */
a21765a7	50
31da46d9 BD	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	}
a21765a7	57	}
a21765a7 BD	58	EXPORT_SYMBOL(s3c2410_gpio_pullup);
	59
	60	void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
	61	{
31da46d9	62	/* do this via gpiolib until all users removed */
a21765a7	63
31da46d9 BD	64	gpio_request(pin, "temporary");
	65	gpio_set_value(pin, to);
	66	gpio_free(pin);
a21765a7 BD	67	}
	68
	69	EXPORT_SYMBOL(s3c2410_gpio_setpin);
	70
	71	unsigned int s3c2410_gpio_getpin(unsigned int pin)
	72	{
7987bd7a BD	73	struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
7987bd7a BD	74	unsigned long offs = pin - chip->chip.base;
a21765a7	75
7987bd7a	76	return __raw_readl(chip->base + 0x04) & (1<< offs);
a21765a7 BD	77	}
	78
	79	EXPORT_SYMBOL(s3c2410_gpio_getpin);
	80
	81	unsigned 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
	96	EXPORT_SYMBOL(s3c2410_modify_misccr);