doorbell.h revision 331769 
1/*
2 * Copyright (c) 2007 Cisco, 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 DOORBELL_H
34#define DOORBELL_H
35
36#include <stdint.h>
37#include <pthread.h>
38#include "mlx4.h"
39#include "mmio.h"
40
41struct mlx4_context;
42
43#if SIZEOF_LONG == 8
44
45#if __BYTE_ORDER == __LITTLE_ENDIAN
46#  define MLX4_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0])
47#elif __BYTE_ORDER == __BIG_ENDIAN
48#  define MLX4_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1])
49#else
50#  error __BYTE_ORDER not defined
51#endif
52
53static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
54{
55	mmio_writeq((unsigned long)(ctx->uar + offset), MLX4_PAIR_TO_64(val));
56}
57
58#else
59
60static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
61{
62	pthread_spin_lock(&ctx->uar_lock);
63	mmio_writel((unsigned long)(ctx->uar + offset), val[0]);
64	mmio_writel((unsigned long)(ctx->uar + offset + 4), val[1]);
65	pthread_spin_unlock(&ctx->uar_lock);
66}
67
68#endif
69
70#endif /* DOORBELL_H */
71