sk98lin: resurrect driver

This reverts commit e1abecc48938fbe1966ea6e78267fc673fa59295.

The driver works on some hardware that skge doesn't handle yet.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/net/sk98lin/skgehwt.c b/drivers/net/sk98lin/skgehwt.c
new file mode 100644
index 000000000000..db670993c2df
--- /dev/null
+++ b/drivers/net/sk98lin/skgehwt.c
@@ -0,0 +1,171 @@
+/******************************************************************************
+ *
+ * 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 */