ARM OMAP4 Syslink atomic function header

This patch take care of the atomic functions
used in the IPC modules.
Signed-off-by: Arun M G <arunmg@ti.com>

arch/arm/plat-omap/include/syslink/atomic_linux.h

+/*
+*  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 <linux/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) */
+