1219820Sjeff/*
2219820Sjeff * Copyright (c) 2007 Cisco, Inc.  All rights reserved.
3219820Sjeff *
4219820Sjeff * This software is available to you under a choice of one of two
5219820Sjeff * licenses.  You may choose to be licensed under the terms of the GNU
6219820Sjeff * General Public License (GPL) Version 2, available from the file
7219820Sjeff * COPYING in the main directory of this source tree, or the
8219820Sjeff * OpenIB.org BSD license below:
9219820Sjeff *
10219820Sjeff *     Redistribution and use in source and binary forms, with or
11219820Sjeff *     without modification, are permitted provided that the following
12219820Sjeff *     conditions are met:
13219820Sjeff *
14219820Sjeff *      - Redistributions of source code must retain the above
15219820Sjeff *        copyright notice, this list of conditions and the following
16219820Sjeff *        disclaimer.
17219820Sjeff *
18219820Sjeff *      - Redistributions in binary form must reproduce the above
19219820Sjeff *        copyright notice, this list of conditions and the following
20219820Sjeff *        disclaimer in the documentation and/or other materials
21219820Sjeff *        provided with the distribution.
22219820Sjeff *
23219820Sjeff * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24219820Sjeff * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25219820Sjeff * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26219820Sjeff * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27219820Sjeff * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28219820Sjeff * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29219820Sjeff * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30219820Sjeff * SOFTWARE.
31219820Sjeff */
32219820Sjeff
33219820Sjeff#ifndef DOORBELL_H
34219820Sjeff#define DOORBELL_H
35219820Sjeff
36219820Sjeff#ifdef __LP64__
37219820Sjeff#if __BYTE_ORDER == __LITTLE_ENDIAN
38219820Sjeff#  define MLX4_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0])
39219820Sjeff#elif __BYTE_ORDER == __BIG_ENDIAN
40219820Sjeff#  define MLX4_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1])
41219820Sjeff#else
42219820Sjeff#  error __BYTE_ORDER not defined
43219820Sjeff#endif
44219820Sjeff
45219820Sjeffstatic inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
46219820Sjeff{
47219820Sjeff	*(volatile uint64_t *) (ctx->uar + offset) = MLX4_PAIR_TO_64(val);
48219820Sjeff}
49219820Sjeff
50219820Sjeff#else
51219820Sjeff
52219820Sjeffstatic inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
53219820Sjeff{
54219820Sjeff	pthread_spin_lock(&ctx->uar_lock);
55219820Sjeff	*(volatile uint32_t *) (ctx->uar + offset)     = val[0];
56219820Sjeff	*(volatile uint32_t *) (ctx->uar + offset + 4) = val[1];
57219820Sjeff	pthread_spin_unlock(&ctx->uar_lock);
58219820Sjeff}
59219820Sjeff
60219820Sjeff#endif
61219820Sjeff
62219820Sjeff#endif /* DOORBELL_H */
63