patch-2.1.27 linux/drivers/isdn/sc/timer.c

• Lines: 173
• Date: Tue Feb 25 17:12:50 1997
• Orig file: v2.1.26/linux/drivers/isdn/sc/timer.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/drivers/isdn/sc/timer.c linux/drivers/isdn/sc/timer.c
@@ -0,0 +1,172 @@
+/*
+ *  $Id: timer.c,v 1.2 1996/11/20 17:49:57 fritz Exp $
+ *  Copyright (C) 1996  SpellCaster Telecommunications Inc.
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  For more information, please contact gpl-info@spellcast.com or write:
+ *
+ *     SpellCaster Telecommunications Inc.
+ *     5621 Finch Avenue East, Unit #3
+ *     Scarborough, Ontario  Canada
+ *     M1B 2T9
+ *     +1 (416) 297-8565
+ *     +1 (416) 297-6433 Facsimile
+ */
+
+#define __NO_VERSION__
+#include "includes.h"
+#include "hardware.h"
+#include "message.h"
+#include "card.h"
+
+extern board *adapter[];
+
+extern void flushreadfifo(int);
+extern int  startproc(int);
+extern int  indicate_status(int, int, unsigned long, char *);
+extern int  sendmessage(int, unsigned int, unsigned int, unsigned int,
+        unsigned int, unsigned int, unsigned int, unsigned int *);
+
+
+/*
+ * Write the proper values into the I/O ports following a reset
+ */
+void setup_ports(int card)
+{
+
+	outb((adapter[card]->rambase >> 12), adapter[card]->ioport[EXP_BASE]);
+
+	/* And the IRQ */
+	outb((adapter[card]->interrupt | 0x80), 
+		adapter[card]->ioport[IRQ_SELECT]);
+}
+
+/*
+ * Timed function to check the status of a previous reset
+ * Must be very fast as this function runs in the context of
+ * an interrupt handler.
+ *
+ * Setup the ioports for the board that were cleared by the reset.
+ * Then, check to see if the signate has been set. Next, set the
+ * signature to a known value and issue a startproc if needed.
+ */
+void check_reset(unsigned long data)
+{
+	unsigned long flags;
+	unsigned long sig;
+	int card = (unsigned int) data;
+
+	pr_debug("%s: check_timer timer called\n", adapter[card]->devicename);
+
+	/* Setup the io ports */
+	setup_ports(card);
+
+  	save_flags(flags);
+	cli();
+	outb(adapter[card]->ioport[adapter[card]->shmem_pgport],
+		(adapter[card]->shmem_magic>>14) | 0x80);	
+	sig = (unsigned long) *((unsigned long *)(adapter[card]->rambase + SIG_OFFSET));	
+
+	/* check the signature */
+	if(sig == SIGNATURE) {
+		flushreadfifo(card);
+		restore_flags(flags);
+		/* See if we need to do a startproc */
+		if (adapter[card]->StartOnReset)
+			startproc(card);
+	}
+	else  {
+		pr_debug("%s: No signature yet, waiting another %d jiffies.\n", 
+			adapter[card]->devicename, CHECKRESET_TIME);
+		del_timer(&adapter[card]->reset_timer);
+		adapter[card]->reset_timer.expires = jiffies + CHECKRESET_TIME;
+		add_timer(&adapter[card]->reset_timer);
+	}
+	restore_flags(flags);
+		
+}
+
+/*
+ * Timed function to check the status of a previous reset
+ * Must be very fast as this function runs in the context of
+ * an interrupt handler.
+ *
+ * Send check adapter->phystat to see if the channels are up
+ * If they are, tell ISDN4Linux that the board is up. If not,
+ * tell IADN4Linux that it is up. Always reset the timer to
+ * fire again (endless loop).
+ */
+void check_phystat(unsigned long data)
+{
+	unsigned long flags;
+	int card = (unsigned int) data;
+
+	pr_debug("%s: Checking status...\n", adapter[card]->devicename);
+	/* 
+	 * check the results of the last PhyStat and change only if
+	 * has changed drastically
+	 */
+	if (adapter[card]->nphystat && !adapter[card]->phystat) {   /* All is well */
+		pr_debug("PhyStat transition to RUN\n");
+		pr_info("%s: Switch contacted, transmitter enabled\n", 
+			adapter[card]->devicename);
+		indicate_status(card, ISDN_STAT_RUN, 0, NULL);
+	}
+	else if (!adapter[card]->nphystat && adapter[card]->phystat) {   /* All is not well */
+		pr_debug("PhyStat transition to STOP\n");
+		pr_info("%s: Switch connection lost, transmitter disabled\n", 
+			adapter[card]->devicename);
+
+		indicate_status(card, ISDN_STAT_STOP, 0, NULL);
+	}
+
+	adapter[card]->phystat = adapter[card]->nphystat;
+
+	/* Reinitialize the timer */
+	save_flags(flags);
+	cli();
+	del_timer(&adapter[card]->stat_timer);
+	adapter[card]->stat_timer.expires = jiffies + CHECKSTAT_TIME;
+	add_timer(&adapter[card]->stat_timer);
+	restore_flags(flags);
+
+	/* Send a new cePhyStatus message */
+	sendmessage(card, CEPID,ceReqTypePhy,ceReqClass2,
+		ceReqPhyStatus,0,0,NULL);
+}
+
+/*
+ * When in trace mode, this callback is used to swap the working shared
+ * RAM page to the trace page(s) and process all received messages. It
+ * must be called often enough to get all of the messages out of RAM before
+ * it loops around.
+ * Trace messages are \n terminated strings.
+ * We output the messages in 64 byte chunks through readstat. Each chunk
+ * is scanned for a \n followed by a time stamp. If the timerstamp is older
+ * than the current time, scanning stops and the page and offset are recorded
+ * as the starting point the next time the trace timer is called. The final
+ * step is to restore the working page and reset the timer.
+ */
+void trace_timer(unsigned long data)
+{
+	unsigned long flags;
+
+	/*
+	 * Disable interrupts and swap the first page
+	 */
+	save_flags(flags);
+	cli();
+}