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, MERCHANTABILITY
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: head/sys/dev/bwn/if_bwn_util.h 299757 2016-05-14 20:09:37Z adrian $
30 */
31 #ifndef __IF_BWN_UTIL_H__
32 #define __IF_BWN_UTIL_H__
33
34 /* Hamming weight; used in the PHY routines */
35 static inline int
bwn_hweight32(uint32_t val)36 bwn_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 */
48 static inline int
bwn_clamp_val(int val,int lo,int hi)49 bwn_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
64 extern unsigned int bwn_sqrt(struct bwn_mac *mac, unsigned int x);
65
66 #endif /* __IF_BWN_UTIL_H__ */
67