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