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/******************************************************************************
*
* Name: sktimer.c
* Project: GEnesis, PCI Gigabit Ethernet Adapter
* Version: $Revision: 1.12 $
* Date: $Date: 1999/11/22 13:38:51 $
* Purpose: High level timer functions.
*
******************************************************************************/
/******************************************************************************
*
* (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: sktimer.c,v $
* Revision 1.12 1999/11/22 13:38:51 cgoos
* Changed license header to GPL.
*
* Revision 1.11 1998/12/17 13:24:13 gklug
* fix: restart problem: do NOT destroy timer queue if init 1 is done
*
* Revision 1.10 1998/10/15 15:11:36 gklug
* fix: ID_sccs to SysKonnectFileId
*
* Revision 1.9 1998/09/15 15:15:04 cgoos
* Changed TRUE/FALSE to SK_TRUE/SK_FALSE
*
* Revision 1.8 1998/09/08 08:47:55 gklug
* add: init level handling
*
* Revision 1.7 1998/08/19 09:50:53 gklug
* fix: remove struct keyword from c-code (see CCC) add typedefs
*
* Revision 1.6 1998/08/17 13:43:13 gklug
* chg: Parameter will be union of 64bit para, 2 times SK_U32 or SK_PTR
*
* Revision 1.5 1998/08/14 07:09:14 gklug
* fix: chg pAc -> pAC
*
* Revision 1.4 1998/08/07 12:53:46 gklug
* fix: first compiled version
*
* Revision 1.3 1998/08/07 09:31:53 gklug
* fix: delta spelling
*
* Revision 1.2 1998/08/07 09:31:02 gklug
* adapt functions to new c coding conventions
* rmv: "fast" handling
* chg: inserting of new timer in queue.
* chg: event queue generation when timer runs out
*
* Revision 1.1 1998/08/05 11:27:55 gklug
* first version: adapted from SMT
*
*
*
*
******************************************************************************/
#include <config.h>
/*
Event queue and dispatcher
*/
static const char SysKonnectFileId[] =
"$Header: /usr56/projects/ge/schedule/sktimer.c,v 1.12 1999/11/22 13:38:51 cgoos Exp $" ;
#include "h/skdrv1st.h" /* Driver Specific Definitions */
#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
#ifdef __C2MAN__
/*
Event queue management.
General Description:
*/
intro()
{}
#endif
/* Forward declaration */
static void timer_done(SK_AC *pAC,SK_IOC Ioc,int Restart);
/*
* Inits the software timer
*
* needs to be called during Init level 1.
*/
void SkTimerInit(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc, /* IoContext */
int Level) /* Init Level */
{
switch (Level) {
case SK_INIT_DATA:
pAC->Tim.StQueue = 0 ;
break;
case SK_INIT_IO:
SkHwtInit(pAC,Ioc) ;
SkTimerDone(pAC, Ioc);
break;
default:
break;
}
}
/*
* Stops a high level timer
* - If a timer is not in the queue the function returns normally, too.
*/
void SkTimerStop(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc, /* IoContext */
SK_TIMER *pTimer) /* Timer Pointer to be started */
{
SK_TIMER **ppTimPrev ;
SK_TIMER *pTm ;
/*
* remove timer from queue
*/
pTimer->TmActive = SK_FALSE ;
if (pAC->Tim.StQueue == pTimer && !pTimer->TmNext) {
SkHwtStop(pAC,Ioc) ;
}
for (ppTimPrev = &pAC->Tim.StQueue ; (pTm = *ppTimPrev) ;
ppTimPrev = &pTm->TmNext ) {
if (pTm == pTimer) {
/*
* Timer found in queue
* - dequeue it and
* - correct delta of the next timer
*/
*ppTimPrev = pTm->TmNext ;
if (pTm->TmNext) {
/* correct delta of next timer in queue */
pTm->TmNext->TmDelta += pTm->TmDelta ;
}
return ;
}
}
}
/*
* Start a high level software timer
*/
void SkTimerStart(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc, /* IoContext */
SK_TIMER *pTimer, /* Timer Pointer to be started */
SK_U32 Time, /* Time value */
SK_U32 Class, /* Event Class for this timer */
SK_U32 Event, /* Event Value for this timer */
SK_EVPARA Para) /* Event Parameter for this timer */
{
SK_TIMER **ppTimPrev ;
SK_TIMER *pTm ;
SK_U32 Delta ;
Time /= 16 ; /* input is uS, clock ticks are 16uS */
if (!Time)
Time = 1 ;
SkTimerStop(pAC,Ioc,pTimer) ;
pTimer->TmClass = Class ;
pTimer->TmEvent = Event ;
pTimer->TmPara = Para ;
pTimer->TmActive = SK_TRUE ;
if (!pAC->Tim.StQueue) {
/* First Timer to be started */
pAC->Tim.StQueue = pTimer ;
pTimer->TmNext = 0 ;
pTimer->TmDelta = Time ;
SkHwtStart(pAC,Ioc,Time) ;
return ;
}
/*
* timer correction
*/
timer_done(pAC,Ioc,0) ;
/*
* find position in queue
*/
Delta = 0 ;
for (ppTimPrev = &pAC->Tim.StQueue ; (pTm = *ppTimPrev) ;
ppTimPrev = &pTm->TmNext ) {
if (Delta + pTm->TmDelta > Time) {
/* Position found */
/* Here the timer needs to be inserted. */
break ;
}
Delta += pTm->TmDelta ;
}
/* insert in queue */
*ppTimPrev = pTimer ;
pTimer->TmNext = pTm ;
pTimer->TmDelta = Time - Delta ;
if (pTm) {
/* There is a next timer
* -> correct its Delta value.
*/
pTm->TmDelta -= pTimer->TmDelta ;
}
/*
* start new with first
*/
SkHwtStart(pAC,Ioc,pAC->Tim.StQueue->TmDelta) ;
}
void SkTimerDone(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc) /* IoContext */
{
timer_done(pAC,Ioc,1) ;
}
static void timer_done(
SK_AC *pAC, /* Adapters context */
SK_IOC Ioc, /* IoContext */
int Restart) /* Do we need to restart the Hardware timer ? */
{
SK_U32 Delta ;
SK_TIMER *pTm ;
SK_TIMER *pTComp ; /* Timer completed now now */
SK_TIMER **ppLast ; /* Next field of Last timer to be deq */
int Done = 0 ;
Delta = SkHwtRead(pAC,Ioc) ;
ppLast = &pAC->Tim.StQueue ;
pTm = pAC->Tim.StQueue ;
while (pTm && !Done) {
if (Delta >= pTm->TmDelta) {
/* Timer ran out */
pTm->TmActive = SK_FALSE ;
Delta -= pTm->TmDelta ;
ppLast = &pTm->TmNext ;
pTm = pTm->TmNext ;
} else {
/* We found the first timer that did not run out */
pTm->TmDelta -= Delta ;
Delta = 0 ;
Done = 1 ;
}
}
*ppLast = 0 ;
/*
* pTm points to the first Timer that did not run out.
* StQueue points to the first Timer that run out.
*/
for ( pTComp = pAC->Tim.StQueue ; pTComp ; pTComp = pTComp->TmNext) {
SkEventQueue(pAC,pTComp->TmClass, pTComp->TmEvent,
pTComp->TmPara) ;
}
/* Set head of timer queue to the first timer that did not run out */
pAC->Tim.StQueue = pTm ;
if (Restart && pAC->Tim.StQueue) {
/* Restart HW timer */
SkHwtStart(pAC,Ioc,pAC->Tim.StQueue->TmDelta) ;
}
}
/* End of file */
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