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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | /****************************************************************************** * * (C)Copyright 1998,1999 SysKonnect, * a business unit of Schneider & Koch & Co. Datensysteme GmbH. * * See the file "skfddi.c" for further information. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * The information in this file is provided "AS IS" without warranty. * ******************************************************************************/ /* SMT timer */ #include "h/types.h" #include "h/fddi.h" #include "h/smc.h" #ifndef lint static const char ID_sccs[] = "@(#)smttimer.c 2.4 97/08/04 (C) SK " ; #endif /* * external function declarations */ extern u_long hwt_read() ; extern void hwt_stop() ; extern void hwt_start() ; static void timer_done() ; void smt_timer_init(smc) struct s_smc *smc ; { smc->t.st_queue = 0 ; smc->t.st_fast.tm_active = FALSE ; smc->t.st_fast.tm_next = 0 ; hwt_init(smc) ; } void smt_timer_stop(smc,timer) struct s_smc *smc ; struct smt_timer *timer ; { struct smt_timer **prev ; struct smt_timer *tm ; /* * remove timer from queue */ timer->tm_active = FALSE ; if (smc->t.st_queue == timer && !timer->tm_next) { hwt_stop(smc) ; } for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) { if (tm == timer) { *prev = tm->tm_next ; if (tm->tm_next) { tm->tm_next->tm_delta += tm->tm_delta ; } return ; } } } void smt_timer_start(smc,timer,time,token) struct s_smc *smc ; struct smt_timer *timer ; u_long time ; u_long token ; { struct smt_timer **prev ; struct smt_timer *tm ; u_long delta = 0 ; time /= 16 ; /* input is uS, clock ticks are 16uS */ if (!time) time = 1 ; smt_timer_stop(smc,timer) ; timer->tm_smc = smc ; timer->tm_token = token ; timer->tm_active = TRUE ; if (!smc->t.st_queue) { smc->t.st_queue = timer ; timer->tm_next = 0 ; timer->tm_delta = time ; hwt_start(smc,time) ; return ; } /* * timer correction */ timer_done(smc,0) ; /* * find position in queue */ delta = 0 ; for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) { if (delta + tm->tm_delta > time) { break ; } delta += tm->tm_delta ; } /* insert in queue */ *prev = timer ; timer->tm_next = tm ; timer->tm_delta = time - delta ; if (tm) tm->tm_delta -= timer->tm_delta ; /* * start new with first */ hwt_start(smc,smc->t.st_queue->tm_delta) ; } void smt_force_irq(smc) struct s_smc *smc ; { smt_timer_start(smc,&smc->t.st_fast,32L, EV_TOKEN(EVENT_SMT,SM_FAST)); } void smt_timer_done(smc) struct s_smc *smc ; { timer_done(smc,1) ; } static void timer_done(smc,restart) struct s_smc *smc ; int restart ; { u_long delta ; struct smt_timer *tm ; struct smt_timer *next ; struct smt_timer **last ; int done = 0 ; delta = hwt_read(smc) ; last = &smc->t.st_queue ; tm = smc->t.st_queue ; while (tm && !done) { if (delta >= tm->tm_delta) { tm->tm_active = FALSE ; delta -= tm->tm_delta ; last = &tm->tm_next ; tm = tm->tm_next ; } else { tm->tm_delta -= delta ; delta = 0 ; done = 1 ; } } *last = 0 ; next = smc->t.st_queue ; smc->t.st_queue = tm ; for ( tm = next ; tm ; tm = next) { next = tm->tm_next ; timer_event(smc,tm->tm_token) ; } if (restart && smc->t.st_queue) hwt_start(smc,smc->t.st_queue->tm_delta) ; } |