| Ohad Ben-Cohen | bd9a4c7 | 2011-02-17 09:52:03 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Hardware spinlocks internal header |
| 3 | * |
| 4 | * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com |
| 5 | * |
| 6 | * Contact: Ohad Ben-Cohen <ohad@wizery.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published |
| 10 | * by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #ifndef __HWSPINLOCK_HWSPINLOCK_H |
| 19 | #define __HWSPINLOCK_HWSPINLOCK_H |
| 20 | |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <linux/device.h> |
| 23 | |
| 24 | /** |
| 25 | * struct hwspinlock_ops - platform-specific hwspinlock handlers |
| 26 | * |
| 27 | * @trylock: make a single attempt to take the lock. returns 0 on |
| 28 | * failure and true on success. may _not_ sleep. |
| 29 | * @unlock: release the lock. always succeed. may _not_ sleep. |
| 30 | * @relax: optional, platform-specific relax handler, called by hwspinlock |
| 31 | * core while spinning on a lock, between two successive |
| 32 | * invocations of @trylock. may _not_ sleep. |
| 33 | */ |
| 34 | struct hwspinlock_ops { |
| 35 | int (*trylock)(struct hwspinlock *lock); |
| 36 | void (*unlock)(struct hwspinlock *lock); |
| 37 | void (*relax)(struct hwspinlock *lock); |
| 38 | }; |
| 39 | |
| 40 | /** |
| 41 | * struct hwspinlock - this struct represents a single hwspinlock instance |
| 42 | * |
| 43 | * @dev: underlying device, will be used to invoke runtime PM api |
| 44 | * @ops: platform-specific hwspinlock handlers |
| 45 | * @id: a global, unique, system-wide, index of the lock. |
| 46 | * @lock: initialized and used by hwspinlock core |
| 47 | * @owner: underlying implementation module, used to maintain module ref count |
| 48 | * |
| 49 | * Note: currently simplicity was opted for, but later we can squeeze some |
| 50 | * memory bytes by grouping the dev, ops and owner members in a single |
| 51 | * per-platform struct, and have all hwspinlocks point at it. |
| 52 | */ |
| 53 | struct hwspinlock { |
| 54 | struct device *dev; |
| 55 | const struct hwspinlock_ops *ops; |
| 56 | int id; |
| 57 | spinlock_t lock; |
| 58 | struct module *owner; |
| 59 | }; |
| 60 | |
| 61 | #endif /* __HWSPINLOCK_HWSPINLOCK_H */ |