diff options
Diffstat (limited to 'kernel/drivers/isdn/hysdn/hysdn_sched.c')
| -rw-r--r-- | kernel/drivers/isdn/hysdn/hysdn_sched.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/kernel/drivers/isdn/hysdn/hysdn_sched.c b/kernel/drivers/isdn/hysdn/hysdn_sched.c new file mode 100644 index 000000000..31d7c1415 --- /dev/null +++ b/kernel/drivers/isdn/hysdn/hysdn_sched.c @@ -0,0 +1,197 @@ +/* $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 <linux/signal.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <asm/io.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, 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 */ |