linux/drivers/hwspinlock/hwspinlock_internal.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Hardware spinlocks internal header
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
 *
 * Contact: Ohad Ben-Cohen <[email protected]>
 */

#ifndef __HWSPINLOCK_HWSPINLOCK_H
#define __HWSPINLOCK_HWSPINLOCK_H

#include <linux/spinlock.h>
#include <linux/device.h>

struct hwspinlock_device;

/**
 * struct hwspinlock_ops - platform-specific hwspinlock handlers
 *
 * @trylock: make a single attempt to take the lock. returns 0 on
 *	     failure and true on success. may _not_ sleep.
 * @unlock:  release the lock. always succeed. may _not_ sleep.
 * @bust:    optional, platform-specific bust handler, called by hwspinlock
 *	     core to bust a specific lock.
 * @relax:   optional, platform-specific relax handler, called by hwspinlock
 *	     core while spinning on a lock, between two successive
 *	     invocations of @trylock. may _not_ sleep.
 */
struct hwspinlock_ops { … };

/**
 * struct hwspinlock - this struct represents a single hwspinlock instance
 * @bank: the hwspinlock_device structure which owns this lock
 * @lock: initialized and used by hwspinlock core
 * @priv: private data, owned by the underlying platform-specific hwspinlock drv
 */
struct hwspinlock { … };

/**
 * struct hwspinlock_device - a device which usually spans numerous hwspinlocks
 * @dev: underlying device, will be used to invoke runtime PM api
 * @ops: platform-specific hwspinlock handlers
 * @base_id: id index of the first lock in this device
 * @num_locks: number of locks in this device
 * @lock: dynamically allocated array of 'struct hwspinlock'
 */
struct hwspinlock_device { … };

static inline int hwlock_to_id(struct hwspinlock *hwlock)
{ … }

#endif /* __HWSPINLOCK_HWSPINLOCK_H */