patch-2.3.46 linux/drivers/isdn/hysdn/hysdn_sched.c

• Lines: 203
• Date: Tue Feb 15 22:39:01 2000
• Orig file: v2.3.45/linux/drivers/isdn/hysdn/hysdn_sched.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.45/linux/drivers/isdn/hysdn/hysdn_sched.c linux/drivers/isdn/hysdn/hysdn_sched.c
@@ -0,0 +1,202 @@
+/* $Id: hysdn_sched.c,v 1.1 2000/02/10 19:45:18 werner Exp $
+
+ * Linux driver for HYSDN cards, scheduler routines for handling exchange card <-> pc.
+ *
+ * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH
+ *
+ * Copyright 1999  by Werner Cornelius (werner@titro.de)
+ *
+ * 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, 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.
+ *
+ * $Log: hysdn_sched.c,v $
+ * Revision 1.1  2000/02/10 19:45:18  werner
+ *
+ * Initial release
+ *
+ *
+ */
+
+#define __NO_VERSION__
+#include <linux/module.h>
+#include <linux/version.h>
+#include <asm/io.h>
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+
+#include "hysdn_defs.h"
+
+/*****************************************************************************/
+/* hysdn_sched_rx is called from the cards handler to announce new data is   */
+/* available from the card. The routine has to handle the data and return    */
+/* with a nonzero code if the data could be worked (or even thrown away), if */
+/* no room to buffer the data is available a zero return tells the card      */
+/* to keep the data until later.                                             */
+/*****************************************************************************/
+int
+hysdn_sched_rx(hysdn_card * card, uchar * buf, word len, word chan)
+{
+
+	switch (chan) {
+		case CHAN_NDIS_DATA:
+			hysdn_rx_netpkt(card, buf, len);	/* give packet to network handler */
+			break;
+
+		case CHAN_ERRLOG:
+			hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
+			if (card->err_log_state == ERRLOG_STATE_ON)
+				card->err_log_state = ERRLOG_STATE_START;	/* start new fetch */
+			break;
+
+		default:
+			printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
+			break;
+
+	}			/* switch rx channel */
+
+	return (1);		/* always handled */
+}				/* hysdn_sched_rx */
+
+/*****************************************************************************/
+/* hysdn_sched_tx is called from the cards handler to announce that there is */
+/* room in the tx-buffer to the card and data may be sent if needed.         */
+/* If the routine wants to send data it must fill buf, len and chan with the */
+/* appropriate data and return a nonzero value. With a zero return no new    */
+/* data to send is assumed. maxlen specifies the buffer size available for   */
+/* sending.                                                                  */
+/*****************************************************************************/
+int
+hysdn_sched_tx(hysdn_card * card, uchar * buf, word volatile *len, word volatile *chan, word maxlen)
+{
+	struct sk_buff *skb;
+
+	if (card->net_tx_busy) {
+		card->net_tx_busy = 0;	/* reset flag */
+		hysdn_tx_netack(card);	/* acknowledge packet send */
+	}			/* a network packet has completely been transferred */
+	/* first of all async requests are handled */
+	if (card->async_busy) {
+		if (card->async_len <= maxlen) {
+			memcpy(buf, card->async_data, card->async_len);
+			*len = card->async_len;
+			*chan = card->async_channel;
+			card->async_busy = 0;	/* reset request */
+			return (1);
+		}
+		card->async_busy = 0;	/* in case of length error */
+	}			/* async request */
+	if ((card->err_log_state == ERRLOG_STATE_START) &&
+	    (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
+		strcpy(buf, ERRLOG_CMD_REQ);	/* copy the command */
+		*len = ERRLOG_CMD_REQ_SIZE;	/* buffer length */
+		*chan = CHAN_ERRLOG;	/* and channel */
+		card->err_log_state = ERRLOG_STATE_ON;	/* new state is on */
+		return (1);	/* tell that data should be send */
+	}			/* error log start and able to send */
+	if ((card->err_log_state == ERRLOG_STATE_STOP) &&
+	    (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
+		strcpy(buf, ERRLOG_CMD_STOP);	/* copy the command */
+		*len = ERRLOG_CMD_STOP_SIZE;	/* buffer length */
+		*chan = CHAN_ERRLOG;	/* and channel */
+		card->err_log_state = ERRLOG_STATE_OFF;		/* new state is off */
+		return (1);	/* tell that data should be send */
+	}			/* error log start and able to send */
+	/* now handle network interface packets */
+	if ((skb = hysdn_tx_netget(card)) != NULL) {
+		if (skb->len <= maxlen) {
+			memcpy(buf, skb->data, skb->len);	/* copy the packet to the buffer */
+			*len = skb->len;
+			*chan = CHAN_NDIS_DATA;
+			card->net_tx_busy = 1;	/* we are busy sending network data */
+			return (1);	/* go and send the data */
+		} else
+			hysdn_tx_netack(card);	/* aknowledge packet -> throw away */
+	}			/* send a network packet if available */
+	return (0);		/* nothing to send */
+}				/* hysdn_sched_tx */
+
+
+/*****************************************************************************/
+/* send one config line to the card and return 0 if successfull, otherwise a */
+/* negative error code.                                                      */
+/* The function works with timeouts perhaps not giving the greatest speed    */
+/* sending the line, but this should be meaningless beacuse only some lines  */
+/* are to be sent and this happens very seldom.                              */
+/*****************************************************************************/
+int
+hysdn_tx_cfgline(hysdn_card * card, uchar * line, word chan)
+{
+	int cnt = 50;		/* timeout intervalls */
+	ulong flags;
+
+	if (card->debug_flags & LOG_SCHED_ASYN)
+		hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
+
+	save_flags(flags);
+	cli();
+	while (card->async_busy) {
+		sti();
+
+		if (card->debug_flags & LOG_SCHED_ASYN)
+			hysdn_addlog(card, "async tx-cfg delayed");
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout((20 * HZ) / 1000);	/* Timeout 20ms */
+		if (!--cnt) {
+			restore_flags(flags);
+			return (-ERR_ASYNC_TIME);	/* timed out */
+		}
+		cli();
+	}			/* wait for buffer to become free */
+
+	strcpy(card->async_data, line);
+	card->async_len = strlen(line) + 1;
+	card->async_channel = chan;
+	card->async_busy = 1;	/* request transfer */
+
+	/* now queue the task */
+	queue_task(&card->irq_queue, &tq_immediate);
+	mark_bh(IMMEDIATE_BH);
+	sti();
+
+	if (card->debug_flags & LOG_SCHED_ASYN)
+		hysdn_addlog(card, "async tx-cfg data queued");
+
+	cnt++;			/* short delay */
+	cli();
+
+	while (card->async_busy) {
+		sti();
+
+		if (card->debug_flags & LOG_SCHED_ASYN)
+			hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout((20 * HZ) / 1000);	/* Timeout 20ms */
+		if (!--cnt) {
+			restore_flags(flags);
+			return (-ERR_ASYNC_TIME);	/* timed out */
+		}
+		cli();
+	}			/* wait for buffer to become free again */
+
+	restore_flags(flags);
+
+	if (card->debug_flags & LOG_SCHED_ASYN)
+		hysdn_addlog(card, "async tx-cfg data send");
+
+	return (0);		/* line send correctly */
+}				/* hysdn_tx_cfgline */