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/*
* atomic_linux.h
*
* Atomic operations functions
*
* Copyright (C) 2008-2009 Texas Instruments, Inc.
*
* This package 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.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
#ifndef _ATOMIC_LINUX_H
#define _ATOMIC_LINUX_H
#include <linux/types.h>
#include <generated/autoconf.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/atomic.h>
/*
* ======== atomic_cmpmask_and_set ========
* Purpose:
* This will compare a mask and set if not equal
*/
static inline void atomic_cmpmask_and_set(atomic_t *v, u32 mask, u32 val)
{
s32 ret;
unsigned long flags;
atomic_t *atm = v;
raw_local_irq_save(flags);
ret = atm->counter;
if (likely(((ret & mask) != mask)))
atm->counter = val;
raw_local_irq_restore(flags);
}
/*
* ======== atomic_cmpmask_and_set ========
* Purpose:
* This will compare a mask and then check current value less than
* provided value.
*/
static inline bool atomic_cmpmask_and_lt(atomic_t *v, u32 mask, u32 val)
{
bool ret = true;
atomic_t *atm = v;
s32 cur;
unsigned long flags;
raw_local_irq_save(flags);
cur = atm->counter;
/* Compare mask, if matches then compare val */
if (likely(((cur & mask) == mask))) {
if (likely(cur >= val))
ret = false;
}
raw_local_irq_restore(flags);
/* retval = true if mask matches and current value is less than given
* value */
/* retval = false either mask doesnot matches or current value is not
* less than given value */
return ret;
}
/*
* ======== atomic_cmpmask_and_set ========
* Purpose:
* This will compare a mask and then check current value greater than
* provided value.
*/
static inline bool atomic_cmpmask_and_gt(atomic_t *v, u32 mask, u32 val)
{
bool ret = false;
atomic_t *atm = v;
s32 cur;
unsigned long flags;
raw_local_irq_save(flags);
cur = atm->counter;
/* Compare mask, if matches then compare val */
if (likely(((cur & mask) == mask))) {
if (likely(cur > val))
ret = true;
}
raw_local_irq_restore(flags);
/* retval = true if mask matches and current value is less than given
* value */
/* etval =false either mask doesnot matches or current value is not
* greater than given value */
return ret;
}
#endif /* if !defined(_ATOMIC_LINUX_H) */
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