78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* Hardware spinlocks internal header
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*
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* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
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*
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* Contact: Ohad Ben-Cohen <ohad@wizery.com>
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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
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __HWSPINLOCK_HWSPINLOCK_H
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#define __HWSPINLOCK_HWSPINLOCK_H
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#include <linux/spinlock.h>
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#include <linux/device.h>
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struct hwspinlock_device;
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/**
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* struct hwspinlock_ops - platform-specific hwspinlock handlers
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*
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* @trylock: make a single attempt to take the lock. returns 0 on
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* failure and true on success. may _not_ sleep.
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* @unlock: release the lock. always succeed. may _not_ sleep.
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* @relax: optional, platform-specific relax handler, called by hwspinlock
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* core while spinning on a lock, between two successive
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* invocations of @trylock. may _not_ sleep.
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*/
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struct hwspinlock_ops {
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int (*trylock)(struct hwspinlock *lock);
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void (*unlock)(struct hwspinlock *lock);
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void (*relax)(struct hwspinlock *lock);
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};
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/**
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* struct hwspinlock - this struct represents a single hwspinlock instance
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* @bank: the hwspinlock_device structure which owns this lock
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* @lock: initialized and used by hwspinlock core
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* @priv: private data, owned by the underlying platform-specific hwspinlock drv
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*/
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struct hwspinlock {
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struct hwspinlock_device *bank;
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spinlock_t lock;
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void *priv;
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};
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/**
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* struct hwspinlock_device - a device which usually spans numerous hwspinlocks
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* @dev: underlying device, will be used to invoke runtime PM api
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* @ops: platform-specific hwspinlock handlers
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* @base_id: id index of the first lock in this device
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* @num_locks: number of locks in this device
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* @lock: dynamically allocated array of 'struct hwspinlock'
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*/
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struct hwspinlock_device {
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struct device *dev;
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const struct hwspinlock_ops *ops;
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int base_id;
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int num_locks;
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struct hwspinlock lock[0];
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};
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static inline int hwlock_to_id(struct hwspinlock *hwlock)
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{
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int local_id = hwlock - &hwlock->bank->lock[0];
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return hwlock->bank->base_id + local_id;
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}
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#endif /* __HWSPINLOCK_HWSPINLOCK_H */
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