| 1 |
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| 2 | |
| 3 | * Hardware spinlocks internal header
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| 4 | *
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| 5 | * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
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| 6 | *
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| 7 | * Contact: Ohad Ben-Cohen <[email protected]>
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| 8 |
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| 9 |
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| 10 | #ifndef __HWSPINLOCK_HWSPINLOCK_H
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| 11 | #define __HWSPINLOCK_HWSPINLOCK_H
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| 12 |
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| 13 | #include <linux/spinlock.h>
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| 14 | #include <linux/device.h>
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| 15 |
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| 16 | struct hwspinlock_device;
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| 17 |
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| 18 | |
| 19 | * struct hwspinlock_ops - platform-specific hwspinlock handlers
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| 20 | *
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| 21 | * @trylock: make a single attempt to take the lock. returns 0 on
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| 22 | * failure and true on success. may _not_ sleep.
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| 23 | * @unlock: release the lock. always succeed. may _not_ sleep.
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| 24 | * @bust: optional, platform-specific bust handler, called by hwspinlock
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| 25 | * core to bust a specific lock.
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| 26 | * @relax: optional, platform-specific relax handler, called by hwspinlock
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| 27 | * core while spinning on a lock, between two successive
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| 28 | * invocations of @trylock. may _not_ sleep.
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| 29 |
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| 30 | struct hwspinlock_ops {
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| 31 | int (*trylock)(struct hwspinlock *lock);
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| 32 | void (*unlock)(struct hwspinlock *lock);
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| 33 | int (*bust)(struct hwspinlock *lock, unsigned int id);
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| 34 | void (*relax)(struct hwspinlock *lock);
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| 35 | };
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| 36 |
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| 37 | |
| 38 | * struct hwspinlock - this struct represents a single hwspinlock instance
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| 39 | * @bank: the hwspinlock_device structure which owns this lock
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| 40 | * @lock: initialized and used by hwspinlock core
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| 41 | * @priv: private data, owned by the underlying platform-specific hwspinlock drv
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| 42 |
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| 43 | struct hwspinlock {
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| 44 | struct hwspinlock_device *bank;
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| 45 | spinlock_t lock;
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| 46 | void *priv;
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| 47 | };
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| 48 |
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| 49 | |
| 50 | * struct hwspinlock_device - a device which usually spans numerous hwspinlocks
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| 51 | * @dev: underlying device, will be used to invoke runtime PM api
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| 52 | * @ops: platform-specific hwspinlock handlers
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| 53 | * @base_id: id index of the first lock in this device
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| 54 | * @num_locks: number of locks in this device
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| 55 | * @lock: dynamically allocated array of 'struct hwspinlock'
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| 56 |
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| 57 | struct hwspinlock_device {
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| 58 | struct device *dev;
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| 59 | const struct hwspinlock_ops *ops;
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| 60 | int base_id;
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| 61 | int num_locks;
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| 62 | struct hwspinlock lock[];
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| 63 | };
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| 64 |
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| 65 | static inline int hwlock_to_id(struct hwspinlock *hwlock)
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| 66 | {
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| 67 | int local_id = hwlock - &hwlock->bank->lock[0];
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| 68 |
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| 69 | return hwlock->bank->base_id + local_id;
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| 70 | }
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| 71 |
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| 72 | #endif
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