/* 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[0]; }; 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 */