| /* |
| * Hardware spinlocks internal header |
| * |
| * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com |
| * |
| * Contact: Ohad Ben-Cohen <ohad@wizery.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #ifndef __HWSPINLOCK_HWSPINLOCK_H |
| #define __HWSPINLOCK_HWSPINLOCK_H |
| |
| #include <linux/spinlock.h> |
| #include <linux/device.h> |
| |
| /** |
| * 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 |
| * |
| * @dev: underlying device, will be used to invoke runtime PM api |
| * @ops: platform-specific hwspinlock handlers |
| * @id: a global, unique, system-wide, index of the lock. |
| * @lock: initialized and used by hwspinlock core |
| * |
| * Note: currently simplicity was opted for, but later we can squeeze some |
| * memory bytes by grouping dev, ops in a single |
| * per-platform struct, and have all hwspinlocks point at it. |
| */ |
| struct hwspinlock { |
| struct device *dev; |
| const struct hwspinlock_ops *ops; |
| int id; |
| spinlock_t lock; |
| }; |
| |
| #endif /* __HWSPINLOCK_HWSPINLOCK_H */ |