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 #ifndef __IF_ATH_TSF_H__ 32 #define __IF_ATH_TSF_H__ 33 34 /* 35 * Extend 15-bit time stamp from rx descriptor to 36 * a full 64-bit TSF using the specified TSF. 37 */ 38 static __inline u_int64_t 39 ath_extend_tsf15(u_int32_t rstamp, u_int64_t tsf) 40 { 41 if ((tsf & 0x7fff) < rstamp) 42 tsf -= 0x8000; 43 44 return ((tsf &~ 0x7fff) | rstamp); 45 } 46 47 /* 48 * Extend 32-bit time stamp from rx descriptor to 49 * a full 64-bit TSF using the specified TSF. 50 */ 51 static __inline u_int64_t 52 ath_extend_tsf32(u_int32_t rstamp, u_int64_t tsf) 53 { 54 u_int32_t tsf_low = tsf & 0xffffffff; 55 u_int64_t tsf64 = (tsf & ~0xffffffffULL) | rstamp; 56 57 if (rstamp > tsf_low && (rstamp - tsf_low > 0x10000000)) 58 tsf64 -= 0x100000000ULL; 59 60 if (rstamp < tsf_low && (tsf_low - rstamp > 0x10000000)) 61 tsf64 += 0x100000000ULL; 62 63 return tsf64; 64 } 65 66 /* 67 * Extend the TSF from the RX descriptor to a full 64 bit TSF. 68 * Earlier hardware versions only wrote the low 15 bits of the 69 * TSF into the RX descriptor; later versions (AR5416 and up) 70 * include the 32 bit TSF value. 71 */ 72 static __inline u_int64_t 73 ath_extend_tsf(struct ath_softc *sc, u_int32_t rstamp, u_int64_t tsf) 74 { 75 if (sc->sc_rxtsf32) 76 return ath_extend_tsf32(rstamp, tsf); 77 else 78 return ath_extend_tsf15(rstamp, tsf); 79 } 80 81 #endif 82