1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer,
12 *    without modification.
13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
15 *    redistribution must be conditioned upon including a substantially
16 *    similar Disclaimer requirement for further binary redistribution.
17 *
18 * NO WARRANTY
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
29 * THE POSSIBILITY OF SUCH DAMAGES.
30 */
31#ifndef	__IF_ATH_TSF_H__
32#define	__IF_ATH_TSF_H__
33
34/*
35 * Extend 15-bit time stamp from rx descriptor to
36 * a full 64-bit TSF using the specified TSF.
37 */
38static __inline u_int64_t
39ath_extend_tsf15(u_int32_t rstamp, u_int64_t tsf)
40{
41	if ((tsf & 0x7fff) < rstamp)
42		tsf -= 0x8000;
43
44	return ((tsf &~ 0x7fff) | rstamp);
45}
46
47/*
48 * Extend 32-bit time stamp from rx descriptor to
49 * a full 64-bit TSF using the specified TSF.
50 */
51static __inline u_int64_t
52ath_extend_tsf32(u_int32_t rstamp, u_int64_t tsf)
53{
54	u_int32_t tsf_low = tsf & 0xffffffff;
55	u_int64_t tsf64 = (tsf & ~0xffffffffULL) | rstamp;
56
57	if (rstamp > tsf_low && (rstamp - tsf_low > 0x10000000))
58		tsf64 -= 0x100000000ULL;
59
60	if (rstamp < tsf_low && (tsf_low - rstamp > 0x10000000))
61		tsf64 += 0x100000000ULL;
62
63	return tsf64;
64}
65
66/*
67 * Extend the TSF from the RX descriptor to a full 64 bit TSF.
68 * Earlier hardware versions only wrote the low 15 bits of the
69 * TSF into the RX descriptor; later versions (AR5416 and up)
70 * include the 32 bit TSF value.
71 */
72static __inline u_int64_t
73ath_extend_tsf(struct ath_softc *sc, u_int32_t rstamp, u_int64_t tsf)
74{
75	if (sc->sc_rxtsf32)
76		return ath_extend_tsf32(rstamp, tsf);
77	else
78		return ath_extend_tsf15(rstamp, tsf);
79}
80
81#endif
82