projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e126ba97 | 1 | /* |
| 302bdf68 | 2 | * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
| e126ba97 EC |
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 */ |