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
75