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/******************************************************************************
*
* Name: skgehwt.c
* Project: GEnesis, PCI Gigabit Ethernet Adapter
* Version: $Revision: 1.13 $
* Date: $Date: 1999/11/22 13:31:12 $
* Purpose: Hardware Timer.
*
******************************************************************************/
/******************************************************************************
*
* (C)Copyright 1998,1999 SysKonnect,
* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
*
* 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.
*
******************************************************************************/
/******************************************************************************
*
* History:
*
* $Log: skgehwt.c,v $
* Revision 1.13 1999/11/22 13:31:12 cgoos
* Changed license header to GPL.
*
* Revision 1.12 1998/10/15 15:11:34 gklug
* fix: ID_sccs to SysKonnectFileId
*
* Revision 1.11 1998/10/08 15:27:51 gklug
* chg: correction factor is host clock dependent
*
* Revision 1.10 1998/09/15 14:18:31 cgoos
* Changed more BOOLEANs to SK_xxx
*
* Revision 1.9 1998/09/15 14:16:06 cgoos
* Changed line 107: FALSE to SK_FALSE
*
* Revision 1.8 1998/08/24 13:04:44 gklug
* fix: typo
*
* Revision 1.7 1998/08/19 09:50:49 gklug
* fix: remove struct keyword from c-code (see CCC) add typedefs
*
* Revision 1.6 1998/08/17 09:59:02 gklug
* fix: typos
*
* Revision 1.5 1998/08/14 07:09:10 gklug
* fix: chg pAc -> pAC
*
* Revision 1.4 1998/08/10 14:14:52 gklug
* rmv: unneccessary SK_ADDR macro
*
* Revision 1.3 1998/08/07 12:53:44 gklug
* fix: first compiled version
*
* Revision 1.2 1998/08/07 09:19:29 gklug
* adapt functions to the C coding conventions
* rmv unneccessary functions.
*
* Revision 1.1 1998/08/05 11:28:36 gklug
* first version: adapted from SMT/FDDI
*
*
*
*
******************************************************************************/
/*
Event queue and dispatcher
*/
static const char SysKonnectFileId[] =
"$Header: /usr56/projects/ge/schedule/skgehwt.c,v 1.13 1999/11/22 13:31:12 cgoos Exp $" ;
#include "h/skdrv1st.h" /* Driver Specific Definitions */
#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
#ifdef __C2MAN__
/*
Hardware Timer function queue management.
General Description:
*/
intro()
{}
#endif
/*
* Prototypes of local functions.
*/
#define SK_HWT_MAX (65000)
/* correction factor */
#define SK_HWT_FAC (1000 * (SK_U32)pAC->GIni.GIHstClkFact / 100)
/*
* Initialize hardware timer.
*
* Must be called during init level 1.
*/
void SkHwtInit(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc) /* IoContext */
{
pAC->Hwt.TStart = 0 ;
pAC->Hwt.TStop = 0 ;
pAC->Hwt.TActive = SK_FALSE ;
SkHwtStop(pAC,Ioc) ;
}
/*
*
* Start hardware timer (clock ticks are 16us).
*
*/
void SkHwtStart(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc, /* IoContext */
SK_U32 Time) /* Time in units of 16us to load the timer with. */
{
SK_U32 Cnt ;
if (Time > SK_HWT_MAX)
Time = SK_HWT_MAX ;
pAC->Hwt.TStart = Time ;
pAC->Hwt.TStop = 0L ;
Cnt = Time ;
/*
* if time < 16 us
* time = 16 us
*/
if (!Cnt) {
Cnt++ ;
}
SK_OUT32(Ioc, B2_TI_INI, Cnt * SK_HWT_FAC) ;
SK_OUT16(Ioc, B2_TI_CRTL, TIM_START) ; /* Start timer. */
pAC->Hwt.TActive = SK_TRUE ;
}
/*
* Stop hardware timer.
* and clear the timer IRQ
*/
void SkHwtStop(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc) /* IoContext */
{
SK_OUT16(Ioc, B2_TI_CRTL, TIM_STOP) ;
SK_OUT16(Ioc, B2_TI_CRTL, TIM_CLR_IRQ) ;
pAC->Hwt.TActive = SK_FALSE ;
}
/*
* Stop hardware timer and read time elapsed since last start.
*
* returns
* The elapsed time since last start in units of 16us.
*
*/
SK_U32 SkHwtRead(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc) /* IoContext */
{
SK_U32 TRead ;
SK_U32 IStatus ;
if (pAC->Hwt.TActive) {
SkHwtStop(pAC,Ioc) ;
SK_IN32(Ioc, B2_TI_VAL, &TRead);
TRead /= SK_HWT_FAC;
SK_IN32(Ioc, B0_ISRC, &IStatus);
/* Check if timer expired (or wraparound). */
if ((TRead > pAC->Hwt.TStart) || (IStatus & IS_TIMINT)) {
SkHwtStop(pAC,Ioc) ;
pAC->Hwt.TStop = pAC->Hwt.TStart ;
} else {
pAC->Hwt.TStop = pAC->Hwt.TStart - TRead ;
}
}
return (pAC->Hwt.TStop) ;
}
/*
* interrupt source= timer
*/
void SkHwtIsr(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc) /* IoContext */
{
SkHwtStop(pAC,Ioc);
pAC->Hwt.TStop = pAC->Hwt.TStart;
SkTimerDone(pAC,Ioc) ;
}
/* End of file */
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