1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/net/fddi/skfp/smttimer.c b/drivers/net/fddi/skfp/smttimer.c
new file mode 100644
index 000000000..5f3e5d7bf
--- /dev/null
+++ b/drivers/net/fddi/skfp/smttimer.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ *
+ *	(C)Copyright 1998,1999 SysKonnect,
+ *	a business unit of Schneider & Koch & Co. Datensysteme GmbH.
+ *
+ *	See the file "skfddi.c" for further information.
+ *
+ *	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"
+
+static void timer_done(struct s_smc *smc, int restart);
+
+void smt_timer_init(struct s_smc *smc)
+{
+	smc->t.st_queue = NULL;
+	smc->t.st_fast.tm_active = FALSE ;
+	smc->t.st_fast.tm_next = NULL;
+	hwt_init(smc) ;
+}
+
+void smt_timer_stop(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(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 = NULL;
+		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(struct s_smc *smc)
+{
+	smt_timer_start(smc,&smc->t.st_fast,32L, EV_TOKEN(EVENT_SMT,SM_FAST)); 
+}
+
+void smt_timer_done(struct s_smc *smc)
+{
+	timer_done(smc,1) ;
+}
+
+static void timer_done(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 = NULL;
+	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) ;
+}
+