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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/dev/bwn/if_bwn_util.h
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/*-

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 * Copyright (c) 2016 Adrian Chadd <[email protected]>.

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer,

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 *    without modification.

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 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

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 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any

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 *    redistribution must be conditioned upon including a substantially

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 *    similar Disclaimer requirement for further binary redistribution.

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 *

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 * NO WARRANTY

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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY

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 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

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 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,

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 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER

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 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

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 * THE POSSIBILITY OF SUCH DAMAGES.

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 */

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#ifndef	__IF_BWN_UTIL_H__

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#define	__IF_BWN_UTIL_H__

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/* Hamming weight; used in the PHY routines */

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static inline int

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bwn_hweight32(uint32_t val)

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{

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	int i, r = 0;

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	/* yes, could do it without a loop.. */

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	for (i = 0; i < 32; i++) {

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		r = r + (val & 1);

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		val = val >> 1;

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	}

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	return r;

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}

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/* Clamp value; PHY code */

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static inline int

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bwn_clamp_val(int val, int lo, int hi)

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{

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	if (val < lo)

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		return lo;

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	if (val > hi)

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		return hi;

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	return val;

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}

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/* Q52 format - used in PHY routines */

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#define	INT_TO_Q52(i)		((i) << 2)

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#define	Q52_TO_INT(q52)		((q52) >> 2)

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#define	Q52_FMT			"%u.%u"

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#define	Q52_ARG(q52)		Q52_TO_INT(q52), ((((q52) & 0x3) * 100) / 4)

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extern	unsigned int bwn_sqrt(struct bwn_mac *mac, unsigned int x);

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#endif	/* __IF_BWN_UTIL_H__ */

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