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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Hardware spinlocks internal header4 *5 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com6 *7 * Contact: Ohad Ben-Cohen <ohad@wizery.com>8 */9 10#ifndef __HWSPINLOCK_HWSPINLOCK_H11#define __HWSPINLOCK_HWSPINLOCK_H12 13#include <linux/spinlock.h>14#include <linux/device.h>15 16struct hwspinlock_device;17 18/**19 * struct hwspinlock_ops - platform-specific hwspinlock handlers20 *21 * @trylock: make a single attempt to take the lock. returns 0 on22 * failure and true on success. may _not_ sleep.23 * @unlock: release the lock. always succeed. may _not_ sleep.24 * @bust: optional, platform-specific bust handler, called by hwspinlock25 * core to bust a specific lock.26 * @relax: optional, platform-specific relax handler, called by hwspinlock27 * core while spinning on a lock, between two successive28 * invocations of @trylock. may _not_ sleep.29 */30struct hwspinlock_ops {31 int (*trylock)(struct hwspinlock *lock);32 void (*unlock)(struct hwspinlock *lock);33 int (*bust)(struct hwspinlock *lock, unsigned int id);34 void (*relax)(struct hwspinlock *lock);35};36 37/**38 * struct hwspinlock - this struct represents a single hwspinlock instance39 * @bank: the hwspinlock_device structure which owns this lock40 * @lock: initialized and used by hwspinlock core41 * @priv: private data, owned by the underlying platform-specific hwspinlock drv42 */43struct hwspinlock {44 struct hwspinlock_device *bank;45 spinlock_t lock;46 void *priv;47};48 49/**50 * struct hwspinlock_device - a device which usually spans numerous hwspinlocks51 * @dev: underlying device, will be used to invoke runtime PM api52 * @ops: platform-specific hwspinlock handlers53 * @base_id: id index of the first lock in this device54 * @num_locks: number of locks in this device55 * @lock: dynamically allocated array of 'struct hwspinlock'56 */57struct hwspinlock_device {58 struct device *dev;59 const struct hwspinlock_ops *ops;60 int base_id;61 int num_locks;62 struct hwspinlock lock[];63};64 65static inline int hwlock_to_id(struct hwspinlock *hwlock)66{67 int local_id = hwlock - &hwlock->bank->lock[0];68 69 return hwlock->bank->base_id + local_id;70}71 72#endif /* __HWSPINLOCK_HWSPINLOCK_H */73