1 /*
2 * Copyright (c) 2017, Mellanox Technologies, Ltd. 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 __LIB_CLOCK_H__
34 #define __LIB_CLOCK_H__
35
36 #if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
37 void mlx5_init_clock(struct mlx5_core_dev *mdev);
38 void mlx5_cleanup_clock(struct mlx5_core_dev *mdev);
39
40 static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
41 {
42 return mdev->clock.ptp ? ptp_clock_index(mdev->clock.ptp) : -1;
43 }
44
45 static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
46 u64 timestamp)
47 {
48 unsigned int seq;
49 u64 nsec;
50
51 do {
52 seq = read_seqbegin(&clock->lock);
53 nsec = timecounter_cyc2time(&clock->tc, timestamp);
54 } while (read_seqretry(&clock->lock, seq));
55
56 return ns_to_ktime(nsec);
57 }
58
59 #else
60 static inline void mlx5_init_clock(struct mlx5_core_dev *mdev) {}
61 static inline void mlx5_cleanup_clock(struct mlx5_core_dev *mdev) {}
62 static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
63 {
64 return -1;
65 }
66
67 static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
68 u64 timestamp)
69 {
70 return 0;
71 }
72 #endif
73
74 #endif