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/*
* arch/arm/mach-ns9xxx/gpio.c
*
* Copyright (C) 2006,2007 by Digi International Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <mach/gpio.h>
#include <mach/processor.h>
#include <mach/processor-ns9360.h>
#include <asm/bug.h>
#include <asm/types.h>
#include "gpio-ns9360.h"
#if defined(CONFIG_PROCESSOR_NS9360)
#define GPIO_MAX 72
#elif defined(CONFIG_PROCESSOR_NS9750)
#define GPIO_MAX 49
#endif
/* protects BBU_GCONFx and BBU_GCTRLx */
static spinlock_t gpio_lock = __SPIN_LOCK_UNLOCKED(gpio_lock);
/* only access gpiores with atomic ops */
static DECLARE_BITMAP(gpiores, GPIO_MAX + 1);
static inline int ns9xxx_valid_gpio(unsigned gpio)
{
#if defined(CONFIG_PROCESSOR_NS9360)
if (processor_is_ns9360())
return gpio <= 72;
else
#endif
#if defined(CONFIG_PROCESSOR_NS9750)
if (processor_is_ns9750())
return gpio <= 49;
else
#endif
{
BUG();
return 0;
}
}
int gpio_request(unsigned gpio, const char *label)
{
if (likely(ns9xxx_valid_gpio(gpio)))
return test_and_set_bit(gpio, gpiores) ? -EBUSY : 0;
else
return -EINVAL;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned gpio)
{
might_sleep();
clear_bit(gpio, gpiores);
return;
}
EXPORT_SYMBOL(gpio_free);
int gpio_direction_input(unsigned gpio)
{
if (likely(ns9xxx_valid_gpio(gpio))) {
int ret = -EINVAL;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
#if defined(CONFIG_PROCESSOR_NS9360)
if (processor_is_ns9360())
ret = __ns9360_gpio_configure(gpio, 0, 0, 3);
else
#endif
BUG();
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
} else
return -EINVAL;
}
EXPORT_SYMBOL(gpio_direction_input);
int gpio_direction_output(unsigned gpio, int value)
{
if (likely(ns9xxx_valid_gpio(gpio))) {
int ret = -EINVAL;
unsigned long flags;
gpio_set_value(gpio, value);
spin_lock_irqsave(&gpio_lock, flags);
#if defined(CONFIG_PROCESSOR_NS9360)
if (processor_is_ns9360())
ret = __ns9360_gpio_configure(gpio, 1, 0, 3);
else
#endif
BUG();
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
} else
return -EINVAL;
}
EXPORT_SYMBOL(gpio_direction_output);
int gpio_get_value(unsigned gpio)
{
#if defined(CONFIG_PROCESSOR_NS9360)
if (processor_is_ns9360())
return ns9360_gpio_get_value(gpio);
else
#endif
{
BUG();
return -EINVAL;
}
}
EXPORT_SYMBOL(gpio_get_value);
void gpio_set_value(unsigned gpio, int value)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
#if defined(CONFIG_PROCESSOR_NS9360)
if (processor_is_ns9360())
ns9360_gpio_set_value(gpio, value);
else
#endif
BUG();
spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(gpio_set_value);
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