1/*-
2 * Copyright (c) 2016 Adrian Chadd <adrian@FreeBSD.org>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer,
10 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 *    redistribution must be conditioned upon including a substantially
14 *    similar Disclaimer requirement for further binary redistribution.
15 *
16 * NO WARRANTY
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
28 *
29 * $FreeBSD$
30 */
31#ifndef	__IF_BWN_UTIL_H__
32#define	__IF_BWN_UTIL_H__
33
34/* Hamming weight; used in the PHY routines */
35static inline int
36bwn_hweight32(uint32_t val)
37{
38	int i, r = 0;
39	/* yes, could do it without a loop.. */
40	for (i = 0; i < 32; i++) {
41		r = r + (val & 1);
42		val = val >> 1;
43	}
44	return r;
45}
46
47/* Clamp value; PHY code */
48static inline int
49bwn_clamp_val(int val, int lo, int hi)
50{
51	if (val < lo)
52		return lo;
53	if (val > hi)
54		return hi;
55	return val;
56}
57
58/* Q52 format - used in PHY routines */
59#define	INT_TO_Q52(i)		((i) << 2)
60#define	Q52_TO_INT(q52)		((q52) >> 2)
61#define	Q52_FMT			"%u.%u"
62#define	Q52_ARG(q52)		Q52_TO_INT(q52), ((((q52) & 0x3) * 100) / 4)
63
64extern	unsigned int bwn_sqrt(struct bwn_mac *mac, unsigned int x);
65
66#endif	/* __IF_BWN_UTIL_H__ */
67