mirror of https://gitee.com/openkylin/linux.git
148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
/*
|
|
* 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);
|