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path: root/drivers/net/sk98lin/skgehwt.c
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Diffstat (limited to 'drivers/net/sk98lin/skgehwt.c')
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diff --git a/drivers/net/sk98lin/skgehwt.c b/drivers/net/sk98lin/skgehwt.c
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+++ b/drivers/net/sk98lin/skgehwt.c
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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
+ *
+ *
+ *
+ *
+ ******************************************************************************/
+
+
+#include <config.h>
+
+#ifdef CONFIG_SK98
+
+/*
+ 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) ;
+}
+
+#endif /* CONFIG_SK98 */
+
+/* End of file */