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69 lines
2.0 KiB
69 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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 <[email protected]> |
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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[]; |
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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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