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/******************************************************************************
*
* Name: sktimer.c
* Project: Gigabit Ethernet Adapters, Event Scheduler Module
* Version: $Revision: 1.14 $
* Date: $Date: 2003/09/16 13:46:51 $
* Purpose: High level timer functions.
*
******************************************************************************/
/******************************************************************************
*
* (C)Copyright 1998-2002 SysKonnect GmbH.
* (C)Copyright 2002-2003 Marvell.
*
* 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.
*
******************************************************************************/
/*
* Event queue and dispatcher
*/
#if (defined(DEBUG) || ((!defined(LINT)) && (!defined(SK_SLIM))))
static const char SysKonnectFileId[] =
"@(#) $Id: sktimer.c,v 1.14 2003/09/16 13:46:51 rschmidt Exp $ (C) Marvell.";
#endif
#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 = NULL;
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 = NULL;
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;
}
/* restart 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 = NULL;
/*
* 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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