1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 * 31 * $FreeBSD$ 32 */ 33 #ifndef __IF_ATH_TSF_H__ 34 #define __IF_ATH_TSF_H__ 35 36 /* 37 * Extend 15-bit time stamp from rx descriptor to 38 * a full 64-bit TSF using the specified TSF. 39 */ 40 static __inline u_int64_t 41 ath_extend_tsf15(u_int32_t rstamp, u_int64_t tsf) 42 { 43 if ((tsf & 0x7fff) < rstamp) 44 tsf -= 0x8000; 45 46 return ((tsf &~ 0x7fff) | rstamp); 47 } 48 49 /* 50 * Extend 32-bit time stamp from rx descriptor to 51 * a full 64-bit TSF using the specified TSF. 52 */ 53 static __inline u_int64_t 54 ath_extend_tsf32(u_int32_t rstamp, u_int64_t tsf) 55 { 56 u_int32_t tsf_low = tsf & 0xffffffff; 57 u_int64_t tsf64 = (tsf & ~0xffffffffULL) | rstamp; 58 59 if (rstamp > tsf_low && (rstamp - tsf_low > 0x10000000)) 60 tsf64 -= 0x100000000ULL; 61 62 if (rstamp < tsf_low && (tsf_low - rstamp > 0x10000000)) 63 tsf64 += 0x100000000ULL; 64 65 return tsf64; 66 } 67 68 /* 69 * Extend the TSF from the RX descriptor to a full 64 bit TSF. 70 * Earlier hardware versions only wrote the low 15 bits of the 71 * TSF into the RX descriptor; later versions (AR5416 and up) 72 * include the 32 bit TSF value. 73 */ 74 static __inline u_int64_t 75 ath_extend_tsf(struct ath_softc *sc, u_int32_t rstamp, u_int64_t tsf) 76 { 77 if (sc->sc_rxtsf32) 78 return ath_extend_tsf32(rstamp, tsf); 79 else 80 return ath_extend_tsf15(rstamp, tsf); 81 } 82 83 #endif 84