drivers/isdn/sc/timer.c

   1 /* $Id: timer.c,v 1.3.6.1 2001/09/23 22:24:59 kai Exp $
   2  *
   3  * Copyright (C) 1996  SpellCaster Telecommunications Inc.
   4  *
   5  * This software may be used and distributed according to the terms
   6  * of the GNU General Public License, incorporated herein by reference.
   7  *
   8  * For more information, please contact gpl-info@spellcast.com or write:
   9  *
  10  *     SpellCaster Telecommunications Inc.
  11  *     5621 Finch Avenue East, Unit #3
  12  *     Scarborough, Ontario  Canada
  13  *     M1B 2T9
  14  *     +1 (416) 297-8565
  15  *     +1 (416) 297-6433 Facsimile
  16  */
  17
  18 #include "includes.h"
  19 #include "hardware.h"
  20 #include "message.h"
  21 #include "card.h"
  22
  23
  24 /*
  25  * Write the proper values into the I/O ports following a reset
  26  */
  27 static void setup_ports(int card)
  28 {
  29
  30         outb((sc_adapter[card]->rambase >> 12), sc_adapter[card]->ioport[EXP_BASE]);
  31
  32         /* And the IRQ */
  33         outb((sc_adapter[card]->interrupt | 0x80),
  34              sc_adapter[card]->ioport[IRQ_SELECT]);
  35 }
  36
  37 /*
  38  * Timed function to check the status of a previous reset
  39  * Must be very fast as this function runs in the context of
  40  * an interrupt handler.
  41  *
  42  * Setup the ioports for the board that were cleared by the reset.
  43  * Then, check to see if the signate has been set. Next, set the
  44  * signature to a known value and issue a startproc if needed.
  45  */
  46 void sc_check_reset(unsigned long data)
  47 {
  48         unsigned long flags;
  49         unsigned long sig;
  50         int card = (unsigned int) data;
  51
  52         pr_debug("%s: check_timer timer called\n",
  53                  sc_adapter[card]->devicename);
  54
  55         /* Setup the io ports */
  56         setup_ports(card);
  57
  58         spin_lock_irqsave(&sc_adapter[card]->lock, flags);
  59         outb(sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport],
  60              (sc_adapter[card]->shmem_magic >> 14) | 0x80);
  61         sig = (unsigned long) *((unsigned long *)(sc_adapter[card]->rambase + SIG_OFFSET));
  62
  63         /* check the signature */
  64         if (sig == SIGNATURE) {
  65                 flushreadfifo(card);
  66                 spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
  67                 /* See if we need to do a startproc */
  68                 if (sc_adapter[card]->StartOnReset)
  69                         startproc(card);
  70         } else  {
  71                 pr_debug("%s: No signature yet, waiting another %lu jiffies.\n",
  72                          sc_adapter[card]->devicename, CHECKRESET_TIME);
  73                 mod_timer(&sc_adapter[card]->reset_timer, jiffies + CHECKRESET_TIME);
  74                 spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
  75         }
  76 }
  77
  78 /*
  79  * Timed function to check the status of a previous reset
  80  * Must be very fast as this function runs in the context of
  81  * an interrupt handler.
  82  *
  83  * Send check sc_adapter->phystat to see if the channels are up
  84  * If they are, tell ISDN4Linux that the board is up. If not,
  85  * tell IADN4Linux that it is up. Always reset the timer to
  86  * fire again (endless loop).
  87  */
  88 void check_phystat(unsigned long data)
  89 {
  90         unsigned long flags;
  91         int card = (unsigned int) data;
  92
  93         pr_debug("%s: Checking status...\n", sc_adapter[card]->devicename);
  94         /*
  95          * check the results of the last PhyStat and change only if
  96          * has changed drastically
  97          */
  98         if (sc_adapter[card]->nphystat && !sc_adapter[card]->phystat) {   /* All is well */
  99                 pr_debug("PhyStat transition to RUN\n");
 100                 pr_info("%s: Switch contacted, transmitter enabled\n",
 101                         sc_adapter[card]->devicename);
 102                 indicate_status(card, ISDN_STAT_RUN, 0, NULL);
 103         }
 104         else if (!sc_adapter[card]->nphystat && sc_adapter[card]->phystat) {   /* All is not well */
 105                 pr_debug("PhyStat transition to STOP\n");
 106                 pr_info("%s: Switch connection lost, transmitter disabled\n",
 107                         sc_adapter[card]->devicename);
 108
 109                 indicate_status(card, ISDN_STAT_STOP, 0, NULL);
 110         }
 111
 112         sc_adapter[card]->phystat = sc_adapter[card]->nphystat;
 113
 114         /* Reinitialize the timer */
 115         spin_lock_irqsave(&sc_adapter[card]->lock, flags);
 116         mod_timer(&sc_adapter[card]->stat_timer, jiffies + CHECKSTAT_TIME);
 117         spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
 118
 119         /* Send a new cePhyStatus message */
 120         sendmessage(card, CEPID, ceReqTypePhy, ceReqClass2,
 121                     ceReqPhyStatus, 0, 0, NULL);
 122 }