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 #ifdef __LP64__
37 #if __BYTE_ORDER == __LITTLE_ENDIAN
38 # define MLX4_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0])
39 #elif __BYTE_ORDER == __BIG_ENDIAN
40 # define MLX4_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1])
41 #else
42 # error __BYTE_ORDER not defined
43 #endif
44
mlx4_write64(uint32_t val[2],struct mlx4_context * ctx,int offset)45 static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
46 {
47 *(volatile uint64_t *) (ctx->uar + offset) = MLX4_PAIR_TO_64(val);
48 }
49
50 #else
51
mlx4_write64(uint32_t val[2],struct mlx4_context * ctx,int offset)52 static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset)
53 {
54 pthread_spin_lock(&ctx->uar_lock);
55 *(volatile uint32_t *) (ctx->uar + offset) = val[0];
56 *(volatile uint32_t *) (ctx->uar + offset + 4) = val[1];
57 pthread_spin_unlock(&ctx->uar_lock);
58 }
59
60 #endif
61
62 #endif /* DOORBELL_H */
63