1. 根目录:
2. arch
3. openrisc
4. include
5. asm
6. gpio.h

/*
 * OpenRISC Linux
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * OpenRISC implementation:
 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 * et al.
 *
 * 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.
 */

#ifndef __ASM_OPENRISC_GPIO_H
#define __ASM_OPENRISC_GPIO_H

#include <linux/errno.h>
#include <asm-generic/gpio.h>

#ifdef CONFIG_GPIOLIB

/*
 * OpenRISC (or1k) does not have on-chip GPIO's so there is not really
 * any standardized implementation that makes sense here.  If passing
 * through gpiolib becomes a bottleneck then it may make sense, on a
 * case-by-case basis, to implement these inlined/rapid versions.
 *
 * Just call gpiolib.
 */
static inline int gpio_get_value(unsigned int gpio)
{
	return __gpio_get_value(gpio);
}

static inline void gpio_set_value(unsigned int gpio, int value)
{
	__gpio_set_value(gpio, value);
}

static inline int gpio_cansleep(unsigned int gpio)
{
	return __gpio_cansleep(gpio);
}

/*
 * Not implemented, yet.
 */
static inline int gpio_to_irq(unsigned int gpio)
{
	return -ENOSYS;
}

static inline int irq_to_gpio(unsigned int irq)
{
	return -EINVAL;
}

#endif /* CONFIG_GPIOLIB */

#endif /* __ASM_OPENRISC_GPIO_H */