/******************************************************************************
*
* Name: skgehwt.c
* Project: Gigabit Ethernet Adapters, Event Scheduler Module
* Version: $Revision: 1.15 $
* Date: $Date: 2003/09/16 13:41:23 $
* Purpose: Hardware Timer
*
******************************************************************************/
/******************************************************************************
*
* (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: skgehwt.c,v 1.15 2003/09/16 13:41:23 rschmidt Exp $ (C) Marvell.";
#endif
#include "h/skdrv1st.h" /* Driver Specific Definitions */
#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
#ifdef __C2MAN__
/*
* Hardware Timer function queue management.
*/
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_CTRL, 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_CTRL, TIM_STOP);
SK_OUT16(Ioc, B2_TI_CTRL, 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 wraped around) */
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);
}
/* End of file */
