| 1 | /* |
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| 2 | * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
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| 3 | * |
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| 4 | * This software is available to you under a choice of one of two |
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| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
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| 6 | * General Public License (GPL) Version 2, available from the file |
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| 7 | * COPYING in the main directory of this source tree, or the |
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| 8 | * OpenIB.org BSD license below: |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or |
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| 11 | * without modification, are permitted provided that the following |
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| 12 | * conditions are met: |
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| 13 | * |
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| 14 | * - Redistributions of source code must retain the above |
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| 15 | * copyright notice, this list of conditions and the following |
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| 16 | * disclaimer. |
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| 17 | * |
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| 18 | * - Redistributions in binary form must reproduce the above |
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| 19 | * copyright notice, this list of conditions and the following |
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| 20 | * disclaimer in the documentation and/or other materials |
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| 21 | * provided with the distribution. |
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| 22 | * |
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| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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| 30 | * SOFTWARE. |
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| 31 | */ |
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| 32 | |
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| 33 | #ifndef MLX5_DOORBELL_H |
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| 34 | #define MLX5_DOORBELL_H |
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| 35 | |
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| 36 | #define MLX5_BF_OFFSET 0x800 |
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| 37 | #define MLX5_CQ_DOORBELL 0x20 |
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| 38 | |
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| 39 | /* Assume that we can just write a 64-bit doorbell atomically. s390 |
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| 40 | * actually doesn't have writeq() but S/390 systems don't even have |
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| 41 | * PCI so we won't worry about it. |
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| 42 | * |
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| 43 | * Note that the write is not atomic on 32-bit systems! In contrast to 64-bit |
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| 44 | * ones, it requires proper locking. mlx5_write64 doesn't do any locking, so use |
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| 45 | * it at your own discretion, protected by some kind of lock on 32 bits. |
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| 46 | * |
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| 47 | * TODO: use write{q,l}_relaxed() |
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| 48 | */ |
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| 49 | |
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| 50 | static inline void mlx5_write64(__be32 val[2], void __iomem *dest) |
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| 51 | { |
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| 52 | #if BITS_PER_LONG == 64 |
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| 53 | __raw_writeq(val: *(u64 *)val, addr: dest); |
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| 54 | #else |
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| 55 | __raw_writel((__force u32) val[0], dest); |
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| 56 | __raw_writel((__force u32) val[1], dest + 4); |
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| 57 | #endif |
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| 58 | } |
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| 59 | |
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| 60 | #endif /* MLX5_DOORBELL_H */ |
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| 61 | |
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