61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
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/*
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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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/* 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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* Note that the write is not atomic on 32-bit systems! In contrast to 64-bit
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* ones, it requires proper locking. mlx5_write64 doesn't do any locking, so use
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* it at your own discretion, protected by some kind of lock on 32 bits.
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*
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* TODO: use write{q,l}_relaxed()
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*/
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static inline void mlx5_write64(__be32 val[2], void __iomem *dest)
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{
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#if BITS_PER_LONG == 64
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__raw_writeq(*(u64 *)val, dest);
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#else
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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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#endif
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}
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#endif /* MLX5_DOORBELL_H */
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