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/*
* $Id: gpio.h 6693 2007-03-25 05:42:16Z ejka $
*
* Copyright (C) 2007 OpenWrt.org
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __AR7_GPIO_H__
#define __AR7_GPIO_H__
#include <asm/ar7/ar7.h>
#define AR7_GPIO_MAX 32
extern int gpio_request(unsigned gpio, char *label);
extern void gpio_free(unsigned gpio);
/* Common GPIO layer */
static inline int gpio_direction_input(unsigned gpio)
{
void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
return 0;
}
static inline int gpio_direction_output(unsigned gpio)
{
void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
return 0;
}
static inline int gpio_get_value(unsigned gpio)
{
void __iomem *gpio_in = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
return ((readl(gpio_in) & (1 << gpio)) != 0);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
void __iomem *gpio_out = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
volatile unsigned tmp;
if (gpio >= AR7_GPIO_MAX)
return;
tmp = readl(gpio_out) & ~(1 << gpio);
if (value)
tmp |= 1 << gpio;
writel(tmp, gpio_out);
}
static inline int gpio_to_irq(unsigned gpio)
{
return -EINVAL;
}
static inline int irq_to_gpio(unsigned irq)
{
return -EINVAL;
}
/* Board specific GPIO functions */
static inline int ar7_gpio_enable(unsigned gpio)
{
void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
writel(readl(gpio_en) | (1 << gpio), gpio_en);
return 0;
}
static inline int ar7_gpio_disable(unsigned gpio)
{
void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
return 0;
}
#include <asm-generic/gpio.h>
#endif
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