1/*
2 * Copyright (c) 2012 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
34#ifndef DOORBELL_H
35#define DOORBELL_H
36
37#include <stdint.h>
38#include "mlx5.h"
39
40#if SIZEOF_LONG == 8
41
42#if __BYTE_ORDER == __LITTLE_ENDIAN
43#  define MLX5_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0])
44#elif __BYTE_ORDER == __BIG_ENDIAN
45#  define MLX5_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1])
46#else
47#  error __BYTE_ORDER not defined
48#endif
49
50static inline void mlx5_write64(uint32_t val[2], void *dest, struct mlx5_spinlock *lock)
51{
52	*(volatile uint64_t *)dest = MLX5_PAIR_TO_64(val);
53}
54
55#else
56
57static inline void mlx5_write64(uint32_t val[2], void *dest, struct mlx5_spinlock *lock)
58{
59	mlx5_spin_lock(lock);
60	*(volatile uint32_t *)dest		= val[0];
61	*(volatile uint32_t *)(dest + 4)	= val[1];
62	mlx5_spin_unlock(lock);
63}
64
65#endif
66
67#endif /* DOORBELL_H */
68