/* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $ * * Linux driver for HYSDN cards * scheduler routines for handling exchange card <-> pc. * * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH * Copyright 1999 by Werner Cornelius (werner@titro.de) * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. * */ #include #include #include #include #include #include #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, unsigned char *buf, unsigned short len, unsigned short chan) { switch (chan) { case CHAN_NDIS_DATA: if (hynet_enable & (1 << card->myid)) { /* give packet to network handler */ hysdn_rx_netpkt(card, buf, len); } 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; #ifdef CONFIG_HYSDN_CAPI case CHAN_CAPI: /* give packet to CAPI handler */ if (hycapi_enable & (1 << card->myid)) { hycapi_rx_capipkt(card, buf, len); } break; #endif /* CONFIG_HYSDN_CAPI */ 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, unsigned char *buf, unsigned short volatile *len, unsigned short volatile *chan, unsigned short 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 ((hynet_enable & (1 << card->myid)) && (skb = hysdn_tx_netget(card)) != NULL) { if (skb->len <= maxlen) { /* copy the packet to the buffer */ skb_copy_from_linear_data(skb, buf, skb->len); *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 */ #ifdef CONFIG_HYSDN_CAPI if( ((hycapi_enable & (1 << card->myid))) && ((skb = hycapi_tx_capiget(card)) != NULL) ) { if (skb->len <= maxlen) { skb_copy_from_linear_data(skb, buf, skb->len); *len = skb->len; *chan = CHAN_CAPI; hycapi_tx_capiack(card); return (1); /* go and send the data */ } } #endif /* CONFIG_HYSDN_CAPI */ return (0); /* nothing to send */ } /* hysdn_sched_tx */ /*****************************************************************************/ /* send one config line to the card and return 0 if successful, otherwise a */ /* negative error code. */ /* The function works with timeouts perhaps not giving the greatest speed */ /* sending the line, but this should be meaningless because only some lines */ /* are to be sent and this happens very seldom. */ /*****************************************************************************/ int hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan) { int cnt = 50; /* timeout intervalls */ unsigned long flags; if (card->debug_flags & LOG_SCHED_ASYN) hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1); while (card->async_busy) { if (card->debug_flags & LOG_SCHED_ASYN) hysdn_addlog(card, "async tx-cfg delayed"); msleep_interruptible(20); /* Timeout 20ms */ if (!--cnt) return (-ERR_ASYNC_TIME); /* timed out */ } /* wait for buffer to become free */ spin_lock_irqsave(&card->hysdn_lock, flags); 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 */ schedule_work(&card->irq_queue); spin_unlock_irqrestore(&card->hysdn_lock, flags); if (card->debug_flags & LOG_SCHED_ASYN) hysdn_addlog(card, "async tx-cfg data queued"); cnt++; /* short delay */ while (card->async_busy) { if (card->debug_flags & LOG_SCHED_ASYN) hysdn_addlog(card, "async tx-cfg waiting for tx-ready"); msleep_interruptible(20); /* Timeout 20ms */ if (!--cnt) return (-ERR_ASYNC_TIME); /* timed out */ } /* wait for buffer to become free again */ if (card->debug_flags & LOG_SCHED_ASYN) hysdn_addlog(card, "async tx-cfg data send"); return (0); /* line send correctly */ } /* hysdn_tx_cfgline */