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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/******************************************************************************
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*
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* (C)Copyright 1998,1999 SysKonnect,
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* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
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*
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* See the file "skfddi.c" for further information.
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*
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* The information in this file is provided "AS IS" without warranty.
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*
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******************************************************************************/
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/*
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SMT timer
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*/
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#include "h/types.h"
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#include "h/fddi.h"
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#include "h/smc.h"
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#ifndef lint
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static const char ID_sccs[] = "@(#)smttimer.c 2.4 97/08/04 (C) SK " ;
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#endif
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static void timer_done(struct s_smc *smc, int restart);
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void smt_timer_init(struct s_smc *smc)
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{
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smc->t.st_queue = NULL;
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smc->t.st_fast.tm_active = FALSE ;
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smc->t.st_fast.tm_next = NULL;
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hwt_init(smc) ;
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}
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void smt_timer_stop(struct s_smc *smc, struct smt_timer *timer)
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{
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struct smt_timer **prev ;
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struct smt_timer *tm ;
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/*
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* remove timer from queue
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*/
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timer->tm_active = FALSE ;
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if (smc->t.st_queue == timer && !timer->tm_next) {
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hwt_stop(smc) ;
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}
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for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) {
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if (tm == timer) {
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*prev = tm->tm_next ;
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if (tm->tm_next) {
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tm->tm_next->tm_delta += tm->tm_delta ;
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}
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return ;
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}
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}
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}
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void smt_timer_start(struct s_smc *smc, struct smt_timer *timer, u_long time,
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u_long token)
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{
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struct smt_timer **prev ;
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struct smt_timer *tm ;
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u_long delta = 0 ;
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time /= 16 ; /* input is uS, clock ticks are 16uS */
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if (!time)
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time = 1 ;
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smt_timer_stop(smc,timer) ;
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timer->tm_smc = smc ;
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timer->tm_token = token ;
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timer->tm_active = TRUE ;
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if (!smc->t.st_queue) {
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smc->t.st_queue = timer ;
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timer->tm_next = NULL;
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timer->tm_delta = time ;
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hwt_start(smc,time) ;
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return ;
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}
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/*
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* timer correction
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*/
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timer_done(smc,0) ;
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/*
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* find position in queue
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*/
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delta = 0 ;
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for (prev = &smc->t.st_queue ; (tm = *prev) ; prev = &tm->tm_next ) {
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if (delta + tm->tm_delta > time) {
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break ;
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}
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delta += tm->tm_delta ;
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}
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/* insert in queue */
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*prev = timer ;
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timer->tm_next = tm ;
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timer->tm_delta = time - delta ;
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if (tm)
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tm->tm_delta -= timer->tm_delta ;
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/*
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* start new with first
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*/
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hwt_start(smc,smc->t.st_queue->tm_delta) ;
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}
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void smt_force_irq(struct s_smc *smc)
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{
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smt_timer_start(smc,&smc->t.st_fast,32L, EV_TOKEN(EVENT_SMT,SM_FAST));
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}
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void smt_timer_done(struct s_smc *smc)
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{
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timer_done(smc,1) ;
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}
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static void timer_done(struct s_smc *smc, int restart)
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{
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u_long delta ;
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struct smt_timer *tm ;
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struct smt_timer *next ;
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struct smt_timer **last ;
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int done = 0 ;
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delta = hwt_read(smc) ;
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last = &smc->t.st_queue ;
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tm = smc->t.st_queue ;
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while (tm && !done) {
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if (delta >= tm->tm_delta) {
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tm->tm_active = FALSE ;
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delta -= tm->tm_delta ;
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last = &tm->tm_next ;
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tm = tm->tm_next ;
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}
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else {
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tm->tm_delta -= delta ;
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delta = 0 ;
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done = 1 ;
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}
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}
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*last = NULL;
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next = smc->t.st_queue ;
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smc->t.st_queue = tm ;
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for ( tm = next ; tm ; tm = next) {
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next = tm->tm_next ;
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timer_event(smc,tm->tm_token) ;
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}
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if (restart && smc->t.st_queue)
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hwt_start(smc,smc->t.st_queue->tm_delta) ;
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}
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