70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Hardware spinlocks internal header
|
|
*
|
|
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
|
|
*
|
|
* Contact: Ohad Ben-Cohen <ohad@wizery.com>
|
|
*/
|
|
|
|
#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.
|
|
* @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 {
|
|
int (*trylock)(struct hwspinlock *lock);
|
|
void (*unlock)(struct hwspinlock *lock);
|
|
void (*relax)(struct hwspinlock *lock);
|
|
};
|
|
|
|
/**
|
|
* 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 *bank;
|
|
spinlock_t lock;
|
|
void *priv;
|
|
};
|
|
|
|
/**
|
|
* 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 {
|
|
struct device *dev;
|
|
const struct hwspinlock_ops *ops;
|
|
int base_id;
|
|
int num_locks;
|
|
struct hwspinlock lock[];
|
|
};
|
|
|
|
static inline int hwlock_to_id(struct hwspinlock *hwlock)
|
|
{
|
|
int local_id = hwlock - &hwlock->bank->lock[0];
|
|
|
|
return hwlock->bank->base_id + local_id;
|
|
}
|
|
|
|
#endif /* __HWSPINLOCK_HWSPINLOCK_H */
|