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62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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/*
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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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/**
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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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*
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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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* @id: a global, unique, system-wide, index of the lock.
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* @lock: initialized and used by hwspinlock core
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* @owner: underlying implementation module, used to maintain module ref count
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*
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* Note: currently simplicity was opted for, but later we can squeeze some
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* memory bytes by grouping the dev, ops and owner members in a single
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* per-platform struct, and have all hwspinlocks point at it.
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*/
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struct hwspinlock {
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struct device *dev;
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const struct hwspinlock_ops *ops;
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int id;
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spinlock_t lock;
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struct module *owner;
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};
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#endif /* __HWSPINLOCK_HWSPINLOCK_H */
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