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
36static inline bool mlx5_is_real_time_rq(struct mlx5_core_dev *mdev)
37{
38	u8 rq_ts_format_cap = MLX5_CAP_GEN(mdev, rq_ts_format);
39
40	return (rq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
41		rq_ts_format_cap ==
42			MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
43}
44
45static inline bool mlx5_is_real_time_sq(struct mlx5_core_dev *mdev)
46{
47	u8 sq_ts_format_cap = MLX5_CAP_GEN(mdev, sq_ts_format);
48
49	return (sq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
50		sq_ts_format_cap ==
51			MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
52}
53
54typedef ktime_t (*cqe_ts_to_ns)(struct mlx5_clock *, u64);
55
56#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
57void mlx5_init_clock(struct mlx5_core_dev *mdev);
58void mlx5_cleanup_clock(struct mlx5_core_dev *mdev);
59
60static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
61{
62	return mdev->clock.ptp ? ptp_clock_index(mdev->clock.ptp) : -1;
63}
64
65static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
66						u64 timestamp)
67{
68	struct mlx5_timer *timer = &clock->timer;
69	unsigned int seq;
70	u64 nsec;
71
72	do {
73		seq = read_seqbegin(&clock->lock);
74		nsec = timecounter_cyc2time(&timer->tc, timestamp);
75	} while (read_seqretry(&clock->lock, seq));
76
77	return ns_to_ktime(nsec);
78}
79
80#define REAL_TIME_TO_NS(hi, low) (((u64)hi) * NSEC_PER_SEC + ((u64)low))
81
82static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
83					      u64 timestamp)
84{
85	u64 time = REAL_TIME_TO_NS(timestamp >> 32, timestamp & 0xFFFFFFFF);
86
87	return ns_to_ktime(time);
88}
89#else
90static inline void mlx5_init_clock(struct mlx5_core_dev *mdev) {}
91static inline void mlx5_cleanup_clock(struct mlx5_core_dev *mdev) {}
92static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
93{
94	return -1;
95}
96
97static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
98						u64 timestamp)
99{
100	return 0;
101}
102
103static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
104					      u64 timestamp)
105{
106	return 0;
107}
108#endif
109
110static inline cqe_ts_to_ns mlx5_rq_ts_translator(struct mlx5_core_dev *mdev)
111{
112	return mlx5_is_real_time_rq(mdev) ? mlx5_real_time_cyc2time :
113					    mlx5_timecounter_cyc2time;
114}
115
116static inline cqe_ts_to_ns mlx5_sq_ts_translator(struct mlx5_core_dev *mdev)
117{
118	return mlx5_is_real_time_sq(mdev) ? mlx5_real_time_cyc2time :
119					    mlx5_timecounter_cyc2time;
120}
121#endif
122