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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 | struct hwspinlock_device; |
25 | |
26 | /** |
27 | * struct hwspinlock_ops - platform-specific hwspinlock handlers |
28 | * |
29 | * @trylock: make a single attempt to take the lock. returns 0 on |
30 | * failure and true on success. may _not_ sleep. |
31 | * @unlock: release the lock. always succeed. may _not_ sleep. |
32 | * @relax: optional, platform-specific relax handler, called by hwspinlock |
33 | * core while spinning on a lock, between two successive |
34 | * invocations of @trylock. may _not_ sleep. |
35 | */ |
36 | struct hwspinlock_ops { |
37 | int (*trylock)(struct hwspinlock *lock); |
38 | void (*unlock)(struct hwspinlock *lock); |
39 | void (*relax)(struct hwspinlock *lock); |
40 | }; |
41 | |
42 | /** |
43 | * struct hwspinlock - this struct represents a single hwspinlock instance |
44 | * @bank: the hwspinlock_device structure which owns this lock |
45 | * @lock: initialized and used by hwspinlock core |
46 | * @priv: private data, owned by the underlying platform-specific hwspinlock drv |
47 | */ |
48 | struct hwspinlock { |
49 | struct hwspinlock_device *bank; |
50 | spinlock_t lock; |
51 | void *priv; |
52 | }; |
53 | |
54 | /** |
55 | * struct hwspinlock_device - a device which usually spans numerous hwspinlocks |
56 | * @dev: underlying device, will be used to invoke runtime PM api |
57 | * @ops: platform-specific hwspinlock handlers |
58 | * @base_id: id index of the first lock in this device |
59 | * @num_locks: number of locks in this device |
60 | * @lock: dynamically allocated array of 'struct hwspinlock' |
61 | */ |
62 | struct hwspinlock_device { |
63 | struct device *dev; |
64 | const struct hwspinlock_ops *ops; |
65 | int base_id; |
66 | int num_locks; |
67 | struct hwspinlock lock[0]; |
68 | }; |
69 | |
70 | static inline int hwlock_to_id(struct hwspinlock *hwlock) |
71 | { |
72 | int local_id = hwlock - &hwlock->bank->lock[0]; |
73 | |
74 | return hwlock->bank->base_id + local_id; |
75 | } |
76 | |
77 | #endif /* __HWSPINLOCK_HWSPINLOCK_H */ |
78 |
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