73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*-
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* Copyright (c) 2013-2017, Mellanox Technologies, Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef MLX5_DOORBELL_H
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#define MLX5_DOORBELL_H
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#define MLX5_BF_OFFSET 0x800
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#define MLX5_CQ_DOORBELL 0x20
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#if BITS_PER_LONG == 64
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/* Assume that we can just write a 64-bit doorbell atomically. s390
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* actually doesn't have writeq() but S/390 systems don't even have
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* PCI so we won't worry about it.
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*/
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#define MLX5_DECLARE_DOORBELL_LOCK(name)
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#define MLX5_INIT_DOORBELL_LOCK(ptr) do { } while (0)
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#define MLX5_GET_DOORBELL_LOCK(ptr) (NULL)
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static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
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spinlock_t *doorbell_lock)
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{
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__raw_writeq(*(u64 *)val, dest);
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}
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#else
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/* Just fall back to a spinlock to protect the doorbell if
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* BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
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* MMIO writes.
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*/
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#define MLX5_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
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#define MLX5_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr)
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#define MLX5_GET_DOORBELL_LOCK(ptr) (ptr)
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static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
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spinlock_t *doorbell_lock)
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{
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unsigned long flags;
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spin_lock_irqsave(doorbell_lock, flags);
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__raw_writel((__force u32) val[0], dest);
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__raw_writel((__force u32) val[1], dest + 4);
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spin_unlock_irqrestore(doorbell_lock, flags);
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}
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#endif
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#endif /* MLX5_DOORBELL_H */
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