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Diffstat (limited to 'drivers/hwspinlock/hwspinlock_internal.h')
-rw-r--r-- | drivers/hwspinlock/hwspinlock_internal.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/hwspinlock/hwspinlock_internal.h b/drivers/hwspinlock/hwspinlock_internal.h new file mode 100644 index 000000000000..69935e6b93e5 --- /dev/null +++ b/drivers/hwspinlock/hwspinlock_internal.h | |||
@@ -0,0 +1,61 @@ | |||
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 */ | ||