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/*-
* Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#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;
spin_lock_irqsave(doorbell_lock, flags);
__raw_writel((__force u32) val[0], dest);
__raw_writel((__force u32) val[1], dest + 4);
spin_unlock_irqrestore(doorbell_lock, flags);
}
#endif
#endif /* MLX5_DOORBELL_H */
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