1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
306 lines
6.4 KiB
C
306 lines
6.4 KiB
C
/******************************************************************************
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*
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* (C)Copyright 1998,1999 SysKonnect,
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* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
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*
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* See the file "skfddi.c" for further information.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* The information in this file is provided "AS IS" without warranty.
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*
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******************************************************************************/
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/*
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* Timer Driver for FBI board (timer chip 82C54)
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*/
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/*
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* Modifications:
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*
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* 28-Jun-1994 sw Edit v1.6.
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* MCA: Added support for the SK-NET FDDI-FM2 adapter. The
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* following functions have been added(+) or modified(*):
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* hwt_start(*), hwt_stop(*), hwt_restart(*), hwt_read(*)
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*/
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#include "h/types.h"
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#include "h/fddi.h"
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#include "h/smc.h"
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#ifndef lint
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static const char ID_sccs[] = "@(#)hwt.c 1.13 97/04/23 (C) SK " ;
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#endif
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/*
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* Prototypes of local functions.
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*/
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/* 28-Jun-1994 sw - Note: hwt_restart() is also used in module 'drvfbi.c'. */
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/*static void hwt_restart() ; */
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/************************
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*
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* hwt_start
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*
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* Start hardware timer (clock ticks are 16us).
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*
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* void hwt_start(
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* struct s_smc *smc,
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* u_long time) ;
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* In
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* smc - A pointer to the SMT Context structure.
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*
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* time - The time in units of 16us to load the timer with.
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* Out
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* Nothing.
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*
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************************/
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#define HWT_MAX (65000)
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void hwt_start(struct s_smc *smc, u_long time)
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{
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u_short cnt ;
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if (time > HWT_MAX)
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time = HWT_MAX ;
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smc->hw.t_start = time ;
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smc->hw.t_stop = 0L ;
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cnt = (u_short)time ;
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/*
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* if time < 16 us
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* time = 16 us
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*/
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if (!cnt)
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cnt++ ;
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#ifndef PCI
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/*
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* 6.25MHz -> CLK0 : T0 (cnt0 = 16us) -> OUT0
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* OUT0 -> CLK1 : T1 (cnt1) OUT1 -> ISRA(IS_TIMINT)
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*/
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OUT_82c54_TIMER(3,1<<6 | 3<<4 | 0<<1) ; /* counter 1, mode 0 */
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OUT_82c54_TIMER(1,cnt & 0xff) ; /* LSB */
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OUT_82c54_TIMER(1,(cnt>>8) & 0xff) ; /* MSB */
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/*
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* start timer by switching counter 0 to mode 3
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* T0 resolution 16 us (CLK0=0.16us)
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*/
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OUT_82c54_TIMER(3,0<<6 | 3<<4 | 3<<1) ; /* counter 0, mode 3 */
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OUT_82c54_TIMER(0,100) ; /* LSB */
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OUT_82c54_TIMER(0,0) ; /* MSB */
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#else /* PCI */
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outpd(ADDR(B2_TI_INI), (u_long) cnt * 200) ; /* Load timer value. */
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outpw(ADDR(B2_TI_CRTL), TIM_START) ; /* Start timer. */
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#endif /* PCI */
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smc->hw.timer_activ = TRUE ;
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}
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/************************
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*
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* hwt_stop
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*
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* Stop hardware timer.
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*
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* void hwt_stop(
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* struct s_smc *smc) ;
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* In
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* smc - A pointer to the SMT Context structure.
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* Out
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* Nothing.
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*
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************************/
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void hwt_stop(struct s_smc *smc)
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{
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#ifndef PCI
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/* stop counter 0 by switching to mode 0 */
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OUT_82c54_TIMER(3,0<<6 | 3<<4 | 0<<1) ; /* counter 0, mode 0 */
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OUT_82c54_TIMER(0,0) ; /* LSB */
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OUT_82c54_TIMER(0,0) ; /* MSB */
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#else /* PCI */
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outpw(ADDR(B2_TI_CRTL), TIM_STOP) ;
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outpw(ADDR(B2_TI_CRTL), TIM_CL_IRQ) ;
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#endif /* PCI */
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smc->hw.timer_activ = FALSE ;
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}
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/************************
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*
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* hwt_init
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*
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* Initialize hardware timer.
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*
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* void hwt_init(
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* struct s_smc *smc) ;
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* In
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* smc - A pointer to the SMT Context structure.
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* Out
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* Nothing.
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*
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************************/
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void hwt_init(struct s_smc *smc)
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{
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smc->hw.t_start = 0 ;
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smc->hw.t_stop = 0 ;
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smc->hw.timer_activ = FALSE ;
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hwt_restart(smc) ;
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}
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/************************
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*
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* hwt_restart
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*
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* Clear timer interrupt.
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*
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* void hwt_restart(
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* struct s_smc *smc) ;
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* In
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* smc - A pointer to the SMT Context structure.
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* Out
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* Nothing.
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*
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************************/
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void hwt_restart(struct s_smc *smc)
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{
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hwt_stop(smc) ;
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#ifndef PCI
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OUT_82c54_TIMER(3,1<<6 | 3<<4 | 0<<1) ; /* counter 1, mode 0 */
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OUT_82c54_TIMER(1,1 ) ; /* LSB */
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OUT_82c54_TIMER(1,0 ) ; /* MSB */
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#endif
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}
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/************************
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*
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* hwt_read
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*
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* Stop hardware timer and read time elapsed since last start.
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*
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* u_long hwt_read(smc) ;
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* In
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* smc - A pointer to the SMT Context structure.
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* Out
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* The elapsed time since last start in units of 16us.
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*
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************************/
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u_long hwt_read(struct s_smc *smc)
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{
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u_short tr ;
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#ifndef PCI
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u_short is ;
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#else
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u_long is ;
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#endif
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if (smc->hw.timer_activ) {
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hwt_stop(smc) ;
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#ifndef PCI
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OUT_82c54_TIMER(3,1<<6) ; /* latch command */
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tr = IN_82c54_TIMER(1) & 0xff ;
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tr += (IN_82c54_TIMER(1) & 0xff)<<8 ;
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#else /* PCI */
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tr = (u_short)((inpd(ADDR(B2_TI_VAL))/200) & 0xffff) ;
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#endif /* PCI */
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is = GET_ISR() ;
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/* Check if timer expired (or wraparound). */
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if ((tr > smc->hw.t_start) || (is & IS_TIMINT)) {
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hwt_restart(smc) ;
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smc->hw.t_stop = smc->hw.t_start ;
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}
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else
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smc->hw.t_stop = smc->hw.t_start - tr ;
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}
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return (smc->hw.t_stop) ;
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}
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#ifdef PCI
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/************************
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*
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* hwt_quick_read
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*
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* Stop hardware timer and read timer value and start the timer again.
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*
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* u_long hwt_read(smc) ;
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* In
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* smc - A pointer to the SMT Context structure.
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* Out
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* current timer value in units of 80ns.
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*
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************************/
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u_long hwt_quick_read(struct s_smc *smc)
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{
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u_long interval ;
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u_long time ;
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interval = inpd(ADDR(B2_TI_INI)) ;
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outpw(ADDR(B2_TI_CRTL), TIM_STOP) ;
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time = inpd(ADDR(B2_TI_VAL)) ;
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outpd(ADDR(B2_TI_INI),time) ;
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outpw(ADDR(B2_TI_CRTL), TIM_START) ;
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outpd(ADDR(B2_TI_INI),interval) ;
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return(time) ;
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}
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/************************
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*
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* hwt_wait_time(smc,start,duration)
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*
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* This function returnes after the amount of time is elapsed
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* since the start time.
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*
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* para start start time
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* duration time to wait
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*
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* NOTE: The fuction will return immediately, if the timer is not
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* started
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************************/
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void hwt_wait_time(struct s_smc *smc, u_long start, long int duration)
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{
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long diff ;
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long interval ;
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int wrapped ;
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/*
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* check if timer is running
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*/
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if (smc->hw.timer_activ == FALSE ||
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hwt_quick_read(smc) == hwt_quick_read(smc)) {
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return ;
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}
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interval = inpd(ADDR(B2_TI_INI)) ;
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if (interval > duration) {
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do {
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diff = (long)(start - hwt_quick_read(smc)) ;
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if (diff < 0) {
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diff += interval ;
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}
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} while (diff <= duration) ;
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}
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else {
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diff = interval ;
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wrapped = 0 ;
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do {
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if (!wrapped) {
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if (hwt_quick_read(smc) >= start) {
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diff += interval ;
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wrapped = 1 ;
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}
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}
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else {
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if (hwt_quick_read(smc) < start) {
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wrapped = 0 ;
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}
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}
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} while (diff <= duration) ;
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}
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}
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#endif
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