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/config.h>
  15 #include <linux/sched.h>
  16 #include <linux/signal.h>
  17 #include <linux/kernel.h>
  18 #include <linux/ioport.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <asm/io.h>
  22
  23 #include "hysdn_defs.h"
  24
  25 /*****************************************************************************/
  26 /* hysdn_sched_rx is called from the cards handler to announce new data is   */
  27 /* available from the card. The routine has to handle the data and return    */
  28 /* with a nonzero code if the data could be worked (or even thrown away), if */
  29 /* no room to buffer the data is available a zero return tells the card      */
  30 /* to keep the data until later.                                             */
  31 /*****************************************************************************/
  32 int
  33 hysdn_sched_rx(hysdn_card * card, uchar * buf, word len, word 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, uchar * buf, word volatile *len, word volatile *chan, word maxlen)
  76 {
  77         struct sk_buff *skb;
  78
  79         if (card->net_tx_busy) {
  80                 card->net_tx_busy = 0;  /* reset flag */
  81                 hysdn_tx_netack(card);  /* acknowledge packet send */
  82         }                       /* a network packet has completely been transferred */
  83         /* first of all async requests are handled */
  84         if (card->async_busy) {
  85                 if (card->async_len <= maxlen) {
  86                         memcpy(buf, card->async_data, card->async_len);
  87                         *len = card->async_len;
  88                         *chan = card->async_channel;
  89                         card->async_busy = 0;   /* reset request */
  90                         return (1);
  91                 }
  92                 card->async_busy = 0;   /* in case of length error */
  93         }                       /* async request */
  94         if ((card->err_log_state == ERRLOG_STATE_START) &&
  95             (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
  96                 strcpy(buf, ERRLOG_CMD_REQ);    /* copy the command */
  97                 *len = ERRLOG_CMD_REQ_SIZE;     /* buffer length */
  98                 *chan = CHAN_ERRLOG;    /* and channel */
  99                 card->err_log_state = ERRLOG_STATE_ON;  /* new state is on */
 100                 return (1);     /* tell that data should be send */
 101         }                       /* error log start and able to send */
 102         if ((card->err_log_state == ERRLOG_STATE_STOP) &&
 103             (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
 104                 strcpy(buf, ERRLOG_CMD_STOP);   /* copy the command */
 105                 *len = ERRLOG_CMD_STOP_SIZE;    /* buffer length */
 106                 *chan = CHAN_ERRLOG;    /* and channel */
 107                 card->err_log_state = ERRLOG_STATE_OFF;         /* new state is off */
 108                 return (1);     /* tell that data should be send */
 109         }                       /* error log start and able to send */
 110         /* now handle network interface packets */
 111         if ((hynet_enable & (1 << card->myid)) &&
 112             (skb = hysdn_tx_netget(card)) != NULL)
 113         {
 114                 if (skb->len <= maxlen) {
 115                         memcpy(buf, skb->data, skb->len);       /* copy the packet to the buffer */
 116                         *len = skb->len;
 117                         *chan = CHAN_NDIS_DATA;
 118                         card->net_tx_busy = 1;  /* we are busy sending network data */
 119                         return (1);     /* go and send the data */
 120                 } else
 121                         hysdn_tx_netack(card);  /* aknowledge packet -> throw away */
 122         }                       /* send a network packet if available */
 123 #ifdef CONFIG_HYSDN_CAPI
 124         if( ((hycapi_enable & (1 << card->myid))) &&
 125             ((skb = hycapi_tx_capiget(card)) != NULL) )
 126         {
 127                 if (skb->len <= maxlen) {
 128                         memcpy(buf, skb->data, skb->len);
 129                         *len = skb->len;
 130                         *chan = CHAN_CAPI;
 131                         hycapi_tx_capiack(card);
 132                         return (1);     /* go and send the data */
 133                 }
 134         }
 135 #endif /* CONFIG_HYSDN_CAPI */
 136         return (0);             /* nothing to send */
 137 }                               /* hysdn_sched_tx */
 138
 139
 140 /*****************************************************************************/
 141 /* send one config line to the card and return 0 if successful, otherwise a */
 142 /* negative error code.                                                      */
 143 /* The function works with timeouts perhaps not giving the greatest speed    */
 144 /* sending the line, but this should be meaningless beacuse only some lines  */
 145 /* are to be sent and this happens very seldom.                              */
 146 /*****************************************************************************/
 147 int
 148 hysdn_tx_cfgline(hysdn_card * card, uchar * line, word chan)
 149 {
 150         int cnt = 50;           /* timeout intervalls */
 151         ulong flags;
 152
 153         if (card->debug_flags & LOG_SCHED_ASYN)
 154                 hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
 155
 156         save_flags(flags);
 157         cli();
 158         while (card->async_busy) {
 159                 sti();
 160
 161                 if (card->debug_flags & LOG_SCHED_ASYN)
 162                         hysdn_addlog(card, "async tx-cfg delayed");
 163
 164                 msleep_interruptible(20);               /* Timeout 20ms */
 165                 if (!--cnt) {
 166                         restore_flags(flags);
 167                         return (-ERR_ASYNC_TIME);       /* timed out */
 168                 }
 169                 cli();
 170         }                       /* wait for buffer to become free */
 171
 172         strcpy(card->async_data, line);
 173         card->async_len = strlen(line) + 1;
 174         card->async_channel = chan;
 175         card->async_busy = 1;   /* request transfer */
 176
 177         /* now queue the task */
 178         schedule_work(&card->irq_queue);
 179         sti();
 180
 181         if (card->debug_flags & LOG_SCHED_ASYN)
 182                 hysdn_addlog(card, "async tx-cfg data queued");
 183
 184         cnt++;                  /* short delay */
 185         cli();
 186
 187         while (card->async_busy) {
 188                 sti();
 189
 190                 if (card->debug_flags & LOG_SCHED_ASYN)
 191                         hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
 192
 193                 msleep_interruptible(20);               /* Timeout 20ms */
 194                 if (!--cnt) {
 195                         restore_flags(flags);
 196                         return (-ERR_ASYNC_TIME);       /* timed out */
 197                 }
 198                 cli();
 199         }                       /* wait for buffer to become free again */
 200
 201         restore_flags(flags);
 202
 203         if (card->debug_flags & LOG_SCHED_ASYN)
 204                 hysdn_addlog(card, "async tx-cfg data send");
 205
 206         return (0);             /* line send correctly */
 207 }                               /* hysdn_tx_cfgline */