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 */ 35 static inline int 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 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