patch-2.2.18 linux/drivers/net/skfp/smttimer.c

• Lines: 174
• Date: Fri Sep 1 13:48:23 2000
• Orig file: v2.2.17/drivers/net/skfp/smttimer.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/net/skfp/smttimer.c linux/drivers/net/skfp/smttimer.c
@@ -0,0 +1,173 @@
+/******************************************************************************
+ *
+ *	(C)Copyright 1998,1999 SysKonnect,
+ *	a business unit of Schneider & Koch & Co. Datensysteme GmbH.
+ *
+ *	See the file "skfddi.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.
+ *
+ ******************************************************************************/
+
+/*
+	SMT timer
+*/
+
+#include "h/types.h"
+#include "h/fddi.h"
+#include "h/smc.h"
+
+#ifndef	lint
+static const char ID_sccs[] = "@(#)smttimer.c	2.4 97/08/04 (C) SK " ;
+#endif
+
+/*
+ * external function declarations
+ */
+extern u_long hwt_read() ;
+extern void hwt_stop() ;
+extern void hwt_start() ;
+
+static void timer_done() ;
+
+
+void smt_timer_init(smc)
+struct s_smc *smc ;
+{
+	smc->t.st_queue = 0 ;
+	smc->t.st_fast.tm_active = FALSE ;
+	smc->t.st_fast.tm_next = 0 ;
+	hwt_init(smc) ;
+}
+
+void smt_timer_stop(smc,timer)
+struct s_smc *smc ;
+struct smt_timer *timer ;
+{
+	struct smt_timer	**prev ;
+	struct smt_timer	*tm ;
+
+	/*
+	 * remove timer from queue
+	 */
+	timer->tm_active = FALSE ;
+	if (smc->t.st_queue == timer && !timer->tm_next) {
+		hwt_stop(smc) ;
+	}
+	for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) {
+		if (tm == timer) {
+			*prev = tm->tm_next ;
+			if (tm->tm_next) {
+				tm->tm_next->tm_delta += tm->tm_delta ;
+			}
+			return ;
+		}
+	}
+}
+
+void smt_timer_start(smc,timer,time,token)
+struct s_smc *smc ;
+struct smt_timer *timer ;
+u_long		time ;
+u_long		token ;
+{
+	struct smt_timer	**prev ;
+	struct smt_timer	*tm ;
+	u_long			delta = 0 ;
+
+	time /= 16 ;		/* input is uS, clock ticks are 16uS */
+	if (!time)
+		time = 1 ;
+	smt_timer_stop(smc,timer) ;
+	timer->tm_smc = smc ;
+	timer->tm_token = token ;
+	timer->tm_active = TRUE ;
+	if (!smc->t.st_queue) {
+		smc->t.st_queue = timer ;
+		timer->tm_next = 0 ;
+		timer->tm_delta = time ;
+		hwt_start(smc,time) ;
+		return ;
+	}
+	/*
+	 * timer correction
+	 */
+	timer_done(smc,0) ;
+
+	/*
+	 * find position in queue
+	 */
+	delta = 0 ;
+	for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) {
+		if (delta + tm->tm_delta > time) {
+			break ;
+		}
+		delta += tm->tm_delta ;
+	}
+	/* insert in queue */
+	*prev = timer ;
+	timer->tm_next = tm ;
+	timer->tm_delta = time - delta ;
+	if (tm)
+		tm->tm_delta -= timer->tm_delta ;
+	/*
+	 * start new with first
+	 */
+	hwt_start(smc,smc->t.st_queue->tm_delta) ;
+}
+
+void smt_force_irq(smc)
+struct s_smc *smc ;
+{
+	smt_timer_start(smc,&smc->t.st_fast,32L, EV_TOKEN(EVENT_SMT,SM_FAST)); 
+}
+
+void smt_timer_done(smc)
+struct s_smc *smc ;
+{
+	timer_done(smc,1) ;
+}
+
+static void timer_done(smc,restart)
+struct s_smc *smc ;
+int restart ;
+{
+	u_long			delta ;
+	struct smt_timer	*tm ;
+	struct smt_timer	*next ;
+	struct smt_timer	**last ;
+	int			done = 0 ;
+
+	delta = hwt_read(smc) ;
+	last = &smc->t.st_queue ;
+	tm = smc->t.st_queue ;
+	while (tm && !done) {
+		if (delta >= tm->tm_delta) {
+			tm->tm_active = FALSE ;
+			delta -= tm->tm_delta ;
+			last = &tm->tm_next ;
+			tm = tm->tm_next ;
+		}
+		else {
+			tm->tm_delta -= delta ;
+			delta = 0 ;
+			done = 1 ;
+		}
+	}
+	*last = 0 ;
+	next = smc->t.st_queue ;
+	smc->t.st_queue = tm ;
+
+	for ( tm = next ; tm ; tm = next) {
+		next = tm->tm_next ;
+		timer_event(smc,tm->tm_token) ;
+	}
+
+	if (restart && smc->t.st_queue)
+		hwt_start(smc,smc->t.st_queue->tm_delta) ;
+}