mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 17:07:38 +00:00
185f812c41
Sphinx expects Return: and not @return to indicate a return value.
find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
|
|
/*
|
|
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
|
|
*/
|
|
|
|
#ifndef _HWSPINLOCK_H_
|
|
#define _HWSPINLOCK_H_
|
|
|
|
/**
|
|
* Implement a hwspinlock uclass.
|
|
* Hardware spinlocks are used to perform hardware protection of
|
|
* critical sections and synchronisation between multiprocessors.
|
|
*/
|
|
|
|
struct udevice;
|
|
|
|
/**
|
|
* struct hwspinlock - A handle to (allowing control of) a single hardware
|
|
* spinlock.
|
|
*
|
|
* @dev: The device which implements the hardware spinlock.
|
|
* @id: The hardware spinlock ID within the provider.
|
|
*/
|
|
struct hwspinlock {
|
|
struct udevice *dev;
|
|
unsigned long id;
|
|
};
|
|
|
|
#if CONFIG_IS_ENABLED(DM_HWSPINLOCK)
|
|
|
|
/**
|
|
* hwspinlock_get_by_index - Get a hardware spinlock by integer index
|
|
*
|
|
* This looks up and request a hardware spinlock. The index is relative to the
|
|
* client device; each device is assumed to have n hardware spinlock associated
|
|
* with it somehow, and this function finds and requests one of them.
|
|
*
|
|
* @dev: The client device.
|
|
* @index: The index of the hardware spinlock to request, within the
|
|
* client's list of hardware spinlock.
|
|
* @hws: A pointer to a hardware spinlock struct to initialize.
|
|
* Return: 0 if OK, or a negative error code.
|
|
*/
|
|
int hwspinlock_get_by_index(struct udevice *dev,
|
|
int index, struct hwspinlock *hws);
|
|
|
|
/**
|
|
* Lock the hardware spinlock
|
|
*
|
|
* @hws: A hardware spinlock struct that previously requested by
|
|
* hwspinlock_get_by_index
|
|
* @timeout: Timeout value in msecs
|
|
* @return: 0 if OK, -ETIMEDOUT if timeout, -ve on other errors
|
|
*/
|
|
int hwspinlock_lock_timeout(struct hwspinlock *hws, unsigned int timeout);
|
|
|
|
/**
|
|
* Unlock the hardware spinlock
|
|
*
|
|
* @hws: A hardware spinlock struct that previously requested by
|
|
* hwspinlock_get_by_index
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int hwspinlock_unlock(struct hwspinlock *hws);
|
|
|
|
#else
|
|
|
|
static inline int hwspinlock_get_by_index(struct udevice *dev,
|
|
int index,
|
|
struct hwspinlock *hws)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int hwspinlock_lock_timeout(struct hwspinlock *hws,
|
|
int timeout)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int hwspinlock_unlock(struct hwspinlock *hws)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_DM_HWSPINLOCK */
|
|
|
|
struct ofnode_phandle_args;
|
|
|
|
/**
|
|
* struct hwspinlock_ops - Driver model hwspinlock operations
|
|
*
|
|
* The uclass interface is implemented by all hwspinlock devices which use
|
|
* driver model.
|
|
*/
|
|
struct hwspinlock_ops {
|
|
/**
|
|
* of_xlate - Translate a client's device-tree (OF) hardware specifier.
|
|
*
|
|
* The hardware core calls this function as the first step in
|
|
* implementing a client's hwspinlock_get_by_*() call.
|
|
*
|
|
* @hws: The hardware spinlock struct to hold the translation
|
|
* result.
|
|
* @args: The hardware spinlock specifier values from device tree.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*of_xlate)(struct hwspinlock *hws,
|
|
struct ofnode_phandle_args *args);
|
|
|
|
/**
|
|
* Lock the hardware spinlock
|
|
*
|
|
* @dev: hwspinlock Device
|
|
* @index: index of the lock to be used
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*lock)(struct udevice *dev, int index);
|
|
|
|
/**
|
|
* Unlock the hardware spinlock
|
|
*
|
|
* @dev: hwspinlock Device
|
|
* @index: index of the lock to be unlocked
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*unlock)(struct udevice *dev, int index);
|
|
|
|
/**
|
|
* Relax - optional
|
|
* Platform-specific relax method, called by hwspinlock core
|
|
* while spinning on a lock, between two successive call to
|
|
* lock
|
|
*
|
|
* @dev: hwspinlock Device
|
|
*/
|
|
void (*relax)(struct udevice *dev);
|
|
};
|
|
|
|
#endif /* _HWSPINLOCK_H_ */
|