1 files changed, 156 insertions, 0 deletions

diff --git a/drivers/net/fddi/skfp/smttimer.c b/drivers/net/fddi/skfp/smttimer.c
new file mode 100644
index 000000000000..531795e98c30
--- /dev/null
+++ b/drivers/net/fddi/skfp/smttimer.c
@@ -0,0 +1,156 @@
+/******************************************************************************
+ *
+ *      (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
+
+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) ;
+}
+