1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD: releng/12.0/sys/dev/ath/if_ath_tdma.h 326255 2017-11-27 14:52:40Z pfg $
32 */
33#ifndef	__IF_ATH_TDMA_H__
34#define	__IF_ATH_TDMA_H__
35
36#define	TDMA_EP_MULTIPLIER	(1<<10) /* pow2 to optimize out * and / */
37#define	TDMA_LPF_LEN		6
38#define	TDMA_DUMMY_MARKER	0x127
39#define	TDMA_EP_MUL(x, mul)	((x) * (mul))
40#define	TDMA_IN(x)		(TDMA_EP_MUL((x), TDMA_EP_MULTIPLIER))
41#define	TDMA_LPF(x, y, len)					\
42    ((x != TDMA_DUMMY_MARKER) ? (((x) * ((len)-1) + (y)) / (len)) : (y))
43#define	TDMA_SAMPLE(x, y)	do {				\
44        x = TDMA_LPF((x), TDMA_IN(y), TDMA_LPF_LEN);		\
45} while (0)
46#define	TDMA_EP_RND(x,mul) \
47	    ((((x)%(mul)) >= ((mul)/2)) ?			\
48	     ((x) + ((mul) - 1)) / (mul) : (x)/(mul))
49#define	TDMA_AVG(x)		TDMA_EP_RND(x, TDMA_EP_MULTIPLIER)
50
51extern	void ath_tdma_config(struct ath_softc *sc, struct ieee80211vap *vap);
52extern	void ath_tdma_update(struct ieee80211_node *ni,
53	    const struct ieee80211_tdma_param *tdma, int changed);
54extern	void ath_tdma_beacon_send(struct ath_softc *sc,
55	    struct ieee80211vap *vap);
56
57#endif
58