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hwspinlock: add hwspinlock driver for multi CPU 

The design follow Linux kernel:
https://www.kernel.org/doc/html/latest/locking/hwspinlock.html

Signed-off-by: ligd <liguiding@pinecone.net>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
ligd 2019-01-08 11:29:37 +08:00 committed by Petro Karashchenko
parent 77cbd3379c
commit 4501490302
1 changed files with 125 additions and 0 deletions
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125
include/nuttx/hwspinlock/hwspinlock.h Normal file
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/****************************************************************************
* include/nuttx/hwspinlock/hwspinlock.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H
#define __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/compiler.h>
#include <nuttx/spinlock.h>
#include <stdbool.h>
/****************************************************************************
* Public Types
****************************************************************************/
struct hwspinlock_dev_s;
struct hwspinlock_ops_s
{
CODE bool (*trylock)(FAR struct hwspinlock_dev_s *dev,
int id, int priority);
CODE void (*relax)(FAR struct hwspinlock_dev_s *dev,
int id, int priority);
CODE void (*unlock)(FAR struct hwspinlock_dev_s *dev, int id);
};
struct hwspinlock_dev_s
{
spinlock_t lock;
FAR const struct hwspinlock_ops_s *ops;
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
static inline bool hwspin_trylock(FAR struct hwspinlock_dev_s *dev,
int id, int priority)
{
return dev->ops->trylock(dev, id, priority);
}
static inline bool hwspin_trylock_irqsave(FAR struct hwspinlock_dev_s *dev,
int id, int priority,
FAR irqstate_t *flags)
{
*flags = spin_lock_irqsave(&dev->lock);
if (hwspin_trylock(dev, id, priority))
{
return true;
}
spin_unlock_irqrestore(&dev->lock, *flags);
return false;
}
static inline void hwspin_lock(FAR struct hwspinlock_dev_s *dev,
int id, int priority)
{
while (!dev->ops->trylock(dev, id, priority))
{
if (dev->ops->relax)
{
dev->ops->relax(dev, id, priority);
}
}
}
static inline irqstate_t
hwspin_lock_irqsave(FAR struct hwspinlock_dev_s *dev,
int id, int priority)
{
irqstate_t flags = spin_lock_irqsave(&dev->lock);
hwspin_lock(dev, id, priority);
return flags;
}
static inline void hwspin_unlock(FAR struct hwspinlock_dev_s *dev,
int id, int priority)
{
dev->ops->unlock(dev, id);
}
static inline void hwspin_unlock_restore(FAR struct hwspinlock_dev_s *dev,
int id, int priority,
irqstate_t flags)
{
hwspin_unlock(dev, id);
spin_lock_restore(&dev->lock, flags);
}
#ifdef __cplusplus
}
#endif
#endif /* __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H */