drivers/isdn/hysdn/hysdn_sched.c

   1 /* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
   2  *
   3  * Linux driver for HYSDN cards
   4  * scheduler routines for handling exchange card <-> pc.
   5  *
   6  * Author    Werner Cornelius (werner@titro.de) for Hypercope GmbH
   7  * Copyright 1999 by Werner Cornelius (werner@titro.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/sched.h>
  15 #include <linux/signal.h>
  16 #include <linux/kernel.h>
  17 #include <linux/ioport.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/delay.h>
  20 #include <asm/io.h>
  21
  22 #include "hysdn_defs.h"
  23
  24 /*****************************************************************************/
  25 /* hysdn_sched_rx is called from the cards handler to announce new data is   */
  26 /* available from the card. The routine has to handle the data and return    */
  27 /* with a nonzero code if the data could be worked (or even thrown away), if */
  28 /* no room to buffer the data is available a zero return tells the card      */
  29 /* to keep the data until later.                                             */
  30 /*****************************************************************************/
  31 int
  32 hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
  33                         unsigned short chan)
  34 {
  35
  36         switch (chan) {
  37                 case CHAN_NDIS_DATA:
  38                         if (hynet_enable & (1 << card->myid)) {
  39                           /* give packet to network handler */
  40                                 hysdn_rx_netpkt(card, buf, len);
  41                         }
  42                         break;
  43
  44                 case CHAN_ERRLOG:
  45                         hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
  46                         if (card->err_log_state == ERRLOG_STATE_ON)
  47                                 card->err_log_state = ERRLOG_STATE_START;       /* start new fetch */
  48                         break;
  49 #ifdef CONFIG_HYSDN_CAPI
  50                 case CHAN_CAPI:
  51 /* give packet to CAPI handler */
  52                         if (hycapi_enable & (1 << card->myid)) {
  53                                 hycapi_rx_capipkt(card, buf, len);
  54                         }
  55                         break;
  56 #endif /* CONFIG_HYSDN_CAPI */
  57                 default:
  58                         printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
  59                         break;
  60
  61         }                       /* switch rx channel */
  62
  63         return (1);             /* always handled */
  64 }                               /* hysdn_sched_rx */
  65
  66 /*****************************************************************************/
  67 /* hysdn_sched_tx is called from the cards handler to announce that there is */
  68 /* room in the tx-buffer to the card and data may be sent if needed.         */
  69 /* If the routine wants to send data it must fill buf, len and chan with the */
  70 /* appropriate data and return a nonzero value. With a zero return no new    */
  71 /* data to send is assumed. maxlen specifies the buffer size available for   */
  72 /* sending.                                                                  */
  73 /*****************************************************************************/
  74 int
  75 hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
  76                 unsigned short volatile *len, unsigned short volatile *chan,
  77                 unsigned short maxlen)
  78 {
  79         struct sk_buff *skb;
  80
  81         if (card->net_tx_busy) {
  82                 card->net_tx_busy = 0;  /* reset flag */
  83                 hysdn_tx_netack(card);  /* acknowledge packet send */
  84         }                       /* a network packet has completely been transferred */
  85         /* first of all async requests are handled */
  86         if (card->async_busy) {
  87                 if (card->async_len <= maxlen) {
  88                         memcpy(buf, card->async_data, card->async_len);
  89                         *len = card->async_len;
  90                         *chan = card->async_channel;
  91                         card->async_busy = 0;   /* reset request */
  92                         return (1);
  93                 }
  94                 card->async_busy = 0;   /* in case of length error */
  95         }                       /* async request */
  96         if ((card->err_log_state == ERRLOG_STATE_START) &&
  97             (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
  98                 strcpy(buf, ERRLOG_CMD_REQ);    /* copy the command */
  99                 *len = ERRLOG_CMD_REQ_SIZE;     /* buffer length */
 100                 *chan = CHAN_ERRLOG;    /* and channel */
 101                 card->err_log_state = ERRLOG_STATE_ON;  /* new state is on */
 102                 return (1);     /* tell that data should be send */
 103         }                       /* error log start and able to send */
 104         if ((card->err_log_state == ERRLOG_STATE_STOP) &&
 105             (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
 106                 strcpy(buf, ERRLOG_CMD_STOP);   /* copy the command */
 107                 *len = ERRLOG_CMD_STOP_SIZE;    /* buffer length */
 108                 *chan = CHAN_ERRLOG;    /* and channel */
 109                 card->err_log_state = ERRLOG_STATE_OFF;         /* new state is off */
 110                 return (1);     /* tell that data should be send */
 111         }                       /* error log start and able to send */
 112         /* now handle network interface packets */
 113         if ((hynet_enable & (1 << card->myid)) &&
 114             (skb = hysdn_tx_netget(card)) != NULL)
 115         {
 116                 if (skb->len <= maxlen) {
 117                         memcpy(buf, skb->data, skb->len);       /* copy the packet to the buffer */
 118                         *len = skb->len;
 119                         *chan = CHAN_NDIS_DATA;
 120                         card->net_tx_busy = 1;  /* we are busy sending network data */
 121                         return (1);     /* go and send the data */
 122                 } else
 123                         hysdn_tx_netack(card);  /* aknowledge packet -> throw away */
 124         }                       /* send a network packet if available */
 125 #ifdef CONFIG_HYSDN_CAPI
 126         if( ((hycapi_enable & (1 << card->myid))) &&
 127             ((skb = hycapi_tx_capiget(card)) != NULL) )
 128         {
 129                 if (skb->len <= maxlen) {
 130                         memcpy(buf, skb->data, skb->len);
 131                         *len = skb->len;
 132                         *chan = CHAN_CAPI;
 133                         hycapi_tx_capiack(card);
 134                         return (1);     /* go and send the data */
 135                 }
 136         }
 137 #endif /* CONFIG_HYSDN_CAPI */
 138         return (0);             /* nothing to send */
 139 }                               /* hysdn_sched_tx */
 140
 141
 142 /*****************************************************************************/
 143 /* send one config line to the card and return 0 if successful, otherwise a */
 144 /* negative error code.                                                      */
 145 /* The function works with timeouts perhaps not giving the greatest speed    */
 146 /* sending the line, but this should be meaningless beacuse only some lines  */
 147 /* are to be sent and this happens very seldom.                              */
 148 /*****************************************************************************/
 149 int
 150 hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
 151 {
 152         int cnt = 50;           /* timeout intervalls */
 153         unsigned long flags;
 154
 155         if (card->debug_flags & LOG_SCHED_ASYN)
 156                 hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
 157
 158         save_flags(flags);
 159         cli();
 160         while (card->async_busy) {
 161                 sti();
 162
 163                 if (card->debug_flags & LOG_SCHED_ASYN)
 164                         hysdn_addlog(card, "async tx-cfg delayed");
 165
 166                 msleep_interruptible(20);               /* Timeout 20ms */
 167                 if (!--cnt) {
 168                         restore_flags(flags);
 169                         return (-ERR_ASYNC_TIME);       /* timed out */
 170                 }
 171                 cli();
 172         }                       /* wait for buffer to become free */
 173
 174         strcpy(card->async_data, line);
 175         card->async_len = strlen(line) + 1;
 176         card->async_channel = chan;
 177         card->async_busy = 1;   /* request transfer */
 178
 179         /* now queue the task */
 180         schedule_work(&card->irq_queue);
 181         sti();
 182
 183         if (card->debug_flags & LOG_SCHED_ASYN)
 184                 hysdn_addlog(card, "async tx-cfg data queued");
 185
 186         cnt++;                  /* short delay */
 187         cli();
 188
 189         while (card->async_busy) {
 190                 sti();
 191
 192                 if (card->debug_flags & LOG_SCHED_ASYN)
 193                         hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
 194
 195                 msleep_interruptible(20);               /* Timeout 20ms */
 196                 if (!--cnt) {
 197                         restore_flags(flags);
 198                         return (-ERR_ASYNC_TIME);       /* timed out */
 199                 }
 200                 cli();
 201         }                       /* wait for buffer to become free again */
 202
 203         restore_flags(flags);
 204
 205         if (card->debug_flags & LOG_SCHED_ASYN)
 206                 hysdn_addlog(card, "async tx-cfg data send");
 207
 208         return (0);             /* line send correctly */
 209 }                               /* hysdn_tx_cfgline */