diff options
Diffstat (limited to 'drivers/net/sk98lin/sktimer.c')
| -rw-r--r-- | drivers/net/sk98lin/sktimer.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/net/sk98lin/sktimer.c b/drivers/net/sk98lin/sktimer.c new file mode 100644 index 000000000000..4e462955ecd8 --- /dev/null +++ b/drivers/net/sk98lin/sktimer.c @@ -0,0 +1,250 @@ +/****************************************************************************** + * + * 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 */ |