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