]>
Commit | Line | Data |
---|---|---|
e126ba97 EC |
1 | /* |
2 | * Copyright (c) 2013, Mellanox Technologies inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #ifndef MLX5_DOORBELL_H | |
34 | #define MLX5_DOORBELL_H | |
35 | ||
36 | #define MLX5_BF_OFFSET 0x800 | |
37 | #define MLX5_CQ_DOORBELL 0x20 | |
38 | ||
39 | #if BITS_PER_LONG == 64 | |
40 | /* Assume that we can just write a 64-bit doorbell atomically. s390 | |
41 | * actually doesn't have writeq() but S/390 systems don't even have | |
42 | * PCI so we won't worry about it. | |
43 | */ | |
44 | ||
45 | #define MLX5_DECLARE_DOORBELL_LOCK(name) | |
46 | #define MLX5_INIT_DOORBELL_LOCK(ptr) do { } while (0) | |
47 | #define MLX5_GET_DOORBELL_LOCK(ptr) (NULL) | |
48 | ||
49 | static inline void mlx5_write64(__be32 val[2], void __iomem *dest, | |
50 | spinlock_t *doorbell_lock) | |
51 | { | |
52 | __raw_writeq(*(u64 *)val, dest); | |
53 | } | |
54 | ||
55 | #else | |
56 | ||
57 | /* Just fall back to a spinlock to protect the doorbell if | |
58 | * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit | |
59 | * MMIO writes. | |
60 | */ | |
61 | ||
62 | #define MLX5_DECLARE_DOORBELL_LOCK(name) spinlock_t name; | |
63 | #define MLX5_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr) | |
64 | #define MLX5_GET_DOORBELL_LOCK(ptr) (ptr) | |
65 | ||
66 | static inline void mlx5_write64(__be32 val[2], void __iomem *dest, | |
67 | spinlock_t *doorbell_lock) | |
68 | { | |
69 | unsigned long flags; | |
70 | ||
71 | spin_lock_irqsave(doorbell_lock, flags); | |
72 | __raw_writel((__force u32) val[0], dest); | |
73 | __raw_writel((__force u32) val[1], dest + 4); | |
74 | spin_unlock_irqrestore(doorbell_lock, flags); | |
75 | } | |
76 | ||
77 | #endif | |
78 | ||
79 | #endif /* MLX5_DOORBELL_H */ |