timer.c

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/* $Id: timer.c,v 1.3.6.1 2001/09/23 22:24:59 kai Exp $
 *
 * Copyright (C) 1996  SpellCaster Telecommunications Inc.
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For more information, please contact [email protected] or write:
 *
 *     SpellCaster Telecommunications Inc.
 *     5621 Finch Avenue East, Unit #3
 *     Scarborough, Ontario  Canada
 *     M1B 2T9
 *     +1 (416) 297-8565
 *     +1 (416) 297-6433 Facsimile
 */

#include "includes.h"
#include "hardware.h"
#include "message.h"
#include "card.h"


/*
 * Write the proper values into the I/O ports following a reset
 */
static void setup_ports(int card)
{

    outb((sc_adapter[card]->rambase >> 12), sc_adapter[card]->ioport[EXP_BASE]);

    /* And the IRQ */
    outb((sc_adapter[card]->interrupt | 0x80),
         sc_adapter[card]->ioport[IRQ_SELECT]);
}

/*
 * Timed function to check the status of a previous reset
 * Must be very fast as this function runs in the context of
 * an interrupt handler.
 *
 * Setup the ioports for the board that were cleared by the reset.
 * Then, check to see if the signate has been set. Next, set the
 * signature to a known value and issue a startproc if needed.
 */
void sc_check_reset(unsigned long data)
{
    unsigned long flags;
    unsigned long sig;
    int card = (unsigned int) data;

    pr_debug("%s: check_timer timer called\n",
         sc_adapter[card]->devicename);

    /* Setup the io ports */
    setup_ports(card);

    spin_lock_irqsave(&sc_adapter[card]->lock, flags);
    outb(sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport],
         (sc_adapter[card]->shmem_magic >> 14) | 0x80);
    sig = (unsigned long) *((unsigned long *)(sc_adapter[card]->rambase + SIG_OFFSET));

    /* check the signature */
    if (sig == SIGNATURE) {
        flushreadfifo(card);
        spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
        /* See if we need to do a startproc */
        if (sc_adapter[card]->StartOnReset)
            startproc(card);
    } else  {
        pr_debug("%s: No signature yet, waiting another %lu jiffies.\n",
             sc_adapter[card]->devicename, CHECKRESET_TIME);
        mod_timer(&sc_adapter[card]->reset_timer, jiffies + CHECKRESET_TIME);
        spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
    }
}

/*
 * Timed function to check the status of a previous reset
 * Must be very fast as this function runs in the context of
 * an interrupt handler.
 *
 * Send check sc_adapter->phystat to see if the channels are up
 * If they are, tell ISDN4Linux that the board is up. If not,
 * tell IADN4Linux that it is up. Always reset the timer to
 * fire again (endless loop).
 */
void check_phystat(unsigned long data)
{
    unsigned long flags;
    int card = (unsigned int) data;

    pr_debug("%s: Checking status...\n", sc_adapter[card]->devicename);
    /*
     * check the results of the last PhyStat and change only if
     * has changed drastically
     */
    if (sc_adapter[card]->nphystat && !sc_adapter[card]->phystat) {   /* All is well */
        pr_debug("PhyStat transition to RUN\n");
        pr_info("%s: Switch contacted, transmitter enabled\n",
            sc_adapter[card]->devicename);
        indicate_status(card, ISDN_STAT_RUN, 0, NULL);
    }
    else if (!sc_adapter[card]->nphystat && sc_adapter[card]->phystat) {   /* All is not well */
        pr_debug("PhyStat transition to STOP\n");
        pr_info("%s: Switch connection lost, transmitter disabled\n",
            sc_adapter[card]->devicename);

        indicate_status(card, ISDN_STAT_STOP, 0, NULL);
    }

    sc_adapter[card]->phystat = sc_adapter[card]->nphystat;

    /* Reinitialize the timer */
    spin_lock_irqsave(&sc_adapter[card]->lock, flags);
    mod_timer(&sc_adapter[card]->stat_timer, jiffies + CHECKSTAT_TIME);
    spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);

    /* Send a new cePhyStatus message */
    sendmessage(card, CEPID, ceReqTypePhy, ceReqClass2,
            ceReqPhyStatus, 0, 0, NULL);
}