patch-2.2.14 linux/drivers/net/sk98lin/sktimer.c

• Lines: 291
• Date: Tue Jan 4 10:12:18 2000
• Orig file: v2.2.13/linux/drivers/net/sk98lin/sktimer.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.13/linux/drivers/net/sk98lin/sktimer.c linux/drivers/net/sk98lin/sktimer.c
@@ -0,0 +1,290 @@
+/******************************************************************************
+ *
+ * Name:	sktimer.c
+ * Project:	GEnesis, PCI Gigabit Ethernet Adapter
+ * Version:	$Revision: 1.11 $
+ * Date:	$Date: 1998/12/17 13:24:13 $
+ * Purpose:	High level timer functions.
+ *
+ ******************************************************************************/
+
+/******************************************************************************
+ *
+ *	(C)Copyright 1998,1999 SysKonnect,
+ *	a business unit of Schneider & Koch & Co. Datensysteme GmbH.
+ *
+ *	See the file "skge.c" for further information.
+ *
+ *	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 1.11  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
+ *	
+ *	
+ *	
+ *
+ ******************************************************************************/
+
+
+/*
+	Event queue and dispatcher
+*/
+static const char SysKonnectFileId[] =
+	"$Header: /usr56/projects/ge/schedule/sktimer.c,v 1.11 1998/12/17 13:24:13 gklug 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 */