FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/if_ath_tsf.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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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