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marcus.erl |
/* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
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*
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* Linux driver for HYSDN cards
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* scheduler routines for handling exchange card <-> pc.
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*
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* Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
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* Copyright 1999 by Werner Cornelius (werner@titro.de)
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include "hysdn_defs.h"
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/*****************************************************************************/
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/* hysdn_sched_rx is called from the cards handler to announce new data is */
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/* available from the card. The routine has to handle the data and return */
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/* with a nonzero code if the data could be worked (or even thrown away), if */
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/* no room to buffer the data is available a zero return tells the card */
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/* to keep the data until later. */
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/*****************************************************************************/
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int
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hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
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unsigned short chan)
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{
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switch (chan) {
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case CHAN_NDIS_DATA:
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if (hynet_enable & (1 << card->myid)) {
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/* give packet to network handler */
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hysdn_rx_netpkt(card, buf, len);
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}
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break;
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case CHAN_ERRLOG:
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hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
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if (card->err_log_state == ERRLOG_STATE_ON)
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card->err_log_state = ERRLOG_STATE_START; /* start new fetch */
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break;
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#ifdef CONFIG_HYSDN_CAPI
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case CHAN_CAPI:
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/* give packet to CAPI handler */
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if (hycapi_enable & (1 << card->myid)) {
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hycapi_rx_capipkt(card, buf, len);
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}
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break;
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#endif /* CONFIG_HYSDN_CAPI */
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default:
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printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
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break;
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} /* switch rx channel */
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return (1); /* always handled */
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} /* hysdn_sched_rx */
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/*****************************************************************************/
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/* hysdn_sched_tx is called from the cards handler to announce that there is */
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/* room in the tx-buffer to the card and data may be sent if needed. */
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/* If the routine wants to send data it must fill buf, len and chan with the */
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/* appropriate data and return a nonzero value. With a zero return no new */
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/* data to send is assumed. maxlen specifies the buffer size available for */
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/* sending. */
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/*****************************************************************************/
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int
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hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
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unsigned short volatile *len, unsigned short volatile *chan,
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unsigned short maxlen)
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{
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struct sk_buff *skb;
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if (card->net_tx_busy) {
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card->net_tx_busy = 0; /* reset flag */
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hysdn_tx_netack(card); /* acknowledge packet send */
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} /* a network packet has completely been transferred */
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/* first of all async requests are handled */
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if (card->async_busy) {
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if (card->async_len <= maxlen) {
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memcpy(buf, card->async_data, card->async_len);
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*len = card->async_len;
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*chan = card->async_channel;
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card->async_busy = 0; /* reset request */
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return (1);
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}
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card->async_busy = 0; /* in case of length error */
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} /* async request */
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if ((card->err_log_state == ERRLOG_STATE_START) &&
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(maxlen >= ERRLOG_CMD_REQ_SIZE)) {
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strcpy(buf, ERRLOG_CMD_REQ); /* copy the command */
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*len = ERRLOG_CMD_REQ_SIZE; /* buffer length */
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*chan = CHAN_ERRLOG; /* and channel */
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card->err_log_state = ERRLOG_STATE_ON; /* new state is on */
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return (1); /* tell that data should be send */
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} /* error log start and able to send */
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if ((card->err_log_state == ERRLOG_STATE_STOP) &&
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(maxlen >= ERRLOG_CMD_STOP_SIZE)) {
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strcpy(buf, ERRLOG_CMD_STOP); /* copy the command */
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*len = ERRLOG_CMD_STOP_SIZE; /* buffer length */
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*chan = CHAN_ERRLOG; /* and channel */
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card->err_log_state = ERRLOG_STATE_OFF; /* new state is off */
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return (1); /* tell that data should be send */
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} /* error log start and able to send */
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/* now handle network interface packets */
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if ((hynet_enable & (1 << card->myid)) &&
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(skb = hysdn_tx_netget(card)) != NULL)
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{
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if (skb->len <= maxlen) {
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/* copy the packet to the buffer */
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skb_copy_from_linear_data(skb, buf, skb->len);
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*len = skb->len;
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*chan = CHAN_NDIS_DATA;
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card->net_tx_busy = 1; /* we are busy sending network data */
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return (1); /* go and send the data */
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} else
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hysdn_tx_netack(card); /* aknowledge packet -> throw away */
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} /* send a network packet if available */
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#ifdef CONFIG_HYSDN_CAPI
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if( ((hycapi_enable & (1 << card->myid))) &&
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((skb = hycapi_tx_capiget(card)) != NULL) )
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{
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if (skb->len <= maxlen) {
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skb_copy_from_linear_data(skb, buf, skb->len);
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*len = skb->len;
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*chan = CHAN_CAPI;
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hycapi_tx_capiack(card);
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return (1); /* go and send the data */
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}
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}
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#endif /* CONFIG_HYSDN_CAPI */
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return (0); /* nothing to send */
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} /* hysdn_sched_tx */
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/*****************************************************************************/
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/* send one config line to the card and return 0 if successful, otherwise a */
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/* negative error code. */
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/* The function works with timeouts perhaps not giving the greatest speed */
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/* sending the line, but this should be meaningless beacuse only some lines */
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/* are to be sent and this happens very seldom. */
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/*****************************************************************************/
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int
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hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
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{
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int cnt = 50; /* timeout intervalls */
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unsigned long flags;
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if (card->debug_flags & LOG_SCHED_ASYN)
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hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
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while (card->async_busy) {
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if (card->debug_flags & LOG_SCHED_ASYN)
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hysdn_addlog(card, "async tx-cfg delayed");
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msleep_interruptible(20); /* Timeout 20ms */
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if (!--cnt)
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return (-ERR_ASYNC_TIME); /* timed out */
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} /* wait for buffer to become free */
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spin_lock_irqsave(&card->hysdn_lock, flags);
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strcpy(card->async_data, line);
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card->async_len = strlen(line) + 1;
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card->async_channel = chan;
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card->async_busy = 1; /* request transfer */
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/* now queue the task */
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schedule_work(&card->irq_queue);
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spin_unlock_irqrestore(&card->hysdn_lock, flags);
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if (card->debug_flags & LOG_SCHED_ASYN)
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hysdn_addlog(card, "async tx-cfg data queued");
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cnt++; /* short delay */
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while (card->async_busy) {
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if (card->debug_flags & LOG_SCHED_ASYN)
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hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
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msleep_interruptible(20); /* Timeout 20ms */
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if (!--cnt)
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return (-ERR_ASYNC_TIME); /* timed out */
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} /* wait for buffer to become free again */
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if (card->debug_flags & LOG_SCHED_ASYN)
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hysdn_addlog(card, "async tx-cfg data send");
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return (0); /* line send correctly */
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} /* hysdn_tx_cfgline */
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