82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
|
||
|
|
*
|
||
|
|
* This software is available to you under a choice of one of two
|
||
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
||
|
|
* General Public License (GPL) Version 2, available from the file
|
||
|
|
* COPYING in the main directory of this source tree, or the
|
||
|
|
* OpenIB.org BSD license below:
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or
|
||
|
|
* without modification, are permitted provided that the following
|
||
|
|
* conditions are met:
|
||
|
|
*
|
||
|
|
* - Redistributions of source code must retain the above
|
||
|
|
* copyright notice, this list of conditions and the following
|
||
|
|
* disclaimer.
|
||
|
|
*
|
||
|
|
* - Redistributions in binary form must reproduce the above
|
||
|
|
* copyright notice, this list of conditions and the following
|
||
|
|
* disclaimer in the documentation and/or other materials
|
||
|
|
* provided with the distribution.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
* SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef MLX5_DOORBELL_H
|
||
|
|
#define MLX5_DOORBELL_H
|
||
|
|
|
||
|
|
#define MLX5_BF_OFFSET 0x800
|
||
|
|
#define MLX5_CQ_DOORBELL 0x20
|
||
|
|
|
||
|
|
#if BITS_PER_LONG == 64
|
||
|
|
/* Assume that we can just write a 64-bit doorbell atomically. s390
|
||
|
|
* actually doesn't have writeq() but S/390 systems don't even have
|
||
|
|
* PCI so we won't worry about it.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define MLX5_DECLARE_DOORBELL_LOCK(name)
|
||
|
|
#define MLX5_INIT_DOORBELL_LOCK(ptr) do { } while (0)
|
||
|
|
#define MLX5_GET_DOORBELL_LOCK(ptr) (NULL)
|
||
|
|
|
||
|
|
static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
|
||
|
|
spinlock_t *doorbell_lock)
|
||
|
|
{
|
||
|
|
__raw_writeq(*(u64 *)val, dest);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
/* Just fall back to a spinlock to protect the doorbell if
|
||
|
|
* BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
|
||
|
|
* MMIO writes.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define MLX5_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
|
||
|
|
#define MLX5_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr)
|
||
|
|
#define MLX5_GET_DOORBELL_LOCK(ptr) (ptr)
|
||
|
|
|
||
|
|
static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
|
||
|
|
spinlock_t *doorbell_lock)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
if (doorbell_lock)
|
||
|
|
spin_lock_irqsave(doorbell_lock, flags);
|
||
|
|
__raw_writel((__force u32) val[0], dest);
|
||
|
|
__raw_writel((__force u32) val[1], dest + 4);
|
||
|
|
if (doorbell_lock)
|
||
|
|
spin_unlock_irqrestore(doorbell_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* MLX5_DOORBELL_H */
|