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/*-
* Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGES.
*
* $FreeBSD$
*/
#ifndef __IF_ATH_TSF_H__
#define __IF_ATH_TSF_H__
/*
* Extend 15-bit time stamp from rx descriptor to
* a full 64-bit TSF using the specified TSF.
*/
static __inline u_int64_t
ath_extend_tsf15(u_int32_t rstamp, u_int64_t tsf)
{
if ((tsf & 0x7fff) < rstamp)
tsf -= 0x8000;
return ((tsf &~ 0x7fff) | rstamp);
}
/*
* Extend 32-bit time stamp from rx descriptor to
* a full 64-bit TSF using the specified TSF.
*/
static __inline u_int64_t
ath_extend_tsf32(u_int32_t rstamp, u_int64_t tsf)
{
u_int32_t tsf_low = tsf & 0xffffffff;
u_int64_t tsf64 = (tsf & ~0xffffffffULL) | rstamp;
if (rstamp > tsf_low && (rstamp - tsf_low > 0x10000000))
tsf64 -= 0x100000000ULL;
if (rstamp < tsf_low && (tsf_low - rstamp > 0x10000000))
tsf64 += 0x100000000ULL;
return tsf64;
}
/*
* Extend the TSF from the RX descriptor to a full 64 bit TSF.
* Earlier hardware versions only wrote the low 15 bits of the
* TSF into the RX descriptor; later versions (AR5416 and up)
* include the 32 bit TSF value.
*/
static __inline u_int64_t
ath_extend_tsf(struct ath_softc *sc, u_int32_t rstamp, u_int64_t tsf)
{
if (sc->sc_rxtsf32)
return ath_extend_tsf32(rstamp, tsf);
else
return ath_extend_tsf15(rstamp, tsf);
}
#endif
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