FreeBSD/Linux Kernel Cross Reference
sys/dev/scc/scc_dev_sab82532.c

     /*-
      * Copyright (c) 2004-2006 Marcel Moolenaar
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      *
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <sys/serial.h>
    
    #include <dev/scc/scc_bfe.h>
    #include <dev/scc/scc_bus.h>
    
    #include <dev/ic/sab82532.h>
    
    #include "scc_if.h"
    
    static int sab82532_bfe_attach(struct scc_softc *, int);
    static int sab82532_bfe_iclear(struct scc_softc *, struct scc_chan *);
    static int sab82532_bfe_ipend(struct scc_softc *);
    static int sab82532_bfe_probe(struct scc_softc *);
    
    static kobj_method_t sab82532_methods[] = {
            KOBJMETHOD(scc_attach,  sab82532_bfe_attach),
            KOBJMETHOD(scc_iclear,  sab82532_bfe_iclear),
            KOBJMETHOD(scc_ipend,   sab82532_bfe_ipend),
            KOBJMETHOD(scc_probe,   sab82532_bfe_probe),
            KOBJMETHOD_END
    };
    
    struct scc_class scc_sab82532_class = {
            "sab82532 class",
            sab82532_methods,
            sizeof(struct scc_softc),
            .cl_channels = SAB_NCHAN,
            .cl_class = SCC_CLASS_SAB82532,
            .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
            .cl_range = SAB_CHANLEN,
    };
    
    static int
    sab82532_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
    {
    
            return (0);
    }
    
    static int
    sab82532_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
    {
            struct scc_bas *bas;
            int i, ofs, rbcl;
    
            bas = &sc->sc_bas;
            ofs = (ch->ch_nr - 1) * SAB_CHANLEN;
            mtx_lock_spin(&sc->sc_hwmtx);
            if (ch->ch_ipend & SER_INT_RXREADY) {
                    if (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_RFNE) {
                            rbcl = scc_getreg(bas, ofs + SAB_RBCL) & 31;
                            if (rbcl == 0)
                                    rbcl = 32;
                            for (i = 0; i < rbcl; i += 2) {
                                    (void)scc_getreg(bas, ofs + SAB_RFIFO);
                                    (void)scc_getreg(bas, ofs + SAB_RFIFO + 1);
                            }
                    }
                    while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
                            ;
                    scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RMC);
                    scc_barrier(bas);
            }
            mtx_unlock_spin(&sc->sc_hwmtx);
           return (0);
   }
   
   static int
   sab82532_bfe_ipend(struct scc_softc *sc)
   {
           struct scc_bas *bas;
           struct scc_chan *ch;
           int ipend;
           int c, ofs;
           uint8_t isr0, isr1;
   
           bas = &sc->sc_bas;
           ipend = 0;
           for (c = 0; c < SAB_NCHAN; c++) {
                   ch = &sc->sc_chan[c];
                   ofs = c * SAB_CHANLEN;
                   mtx_lock_spin(&sc->sc_hwmtx);
                   isr0 = scc_getreg(bas, ofs + SAB_ISR0);
                   isr1 = scc_getreg(bas, ofs + SAB_ISR1);
                   scc_barrier(bas);
                   if (isr0 & SAB_ISR0_TIME) {
                           while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
                                   ;
                           scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RFRD);
                           scc_barrier(bas);
                   }
                   mtx_unlock_spin(&sc->sc_hwmtx);
   
                   ch->ch_ipend = 0;
                   if (isr1 & SAB_ISR1_BRKT)
                           ch->ch_ipend |= SER_INT_BREAK;
                   if (isr0 & SAB_ISR0_RFO)
                           ch->ch_ipend |= SER_INT_OVERRUN;
                   if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF))
                           ch->ch_ipend |= SER_INT_RXREADY;
                   if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC))
                           ch->ch_ipend |= SER_INT_SIGCHG;
                   if (isr1 & SAB_ISR1_ALLS)
                           ch->ch_ipend |= SER_INT_TXIDLE;
                   ipend |= ch->ch_ipend;
           }
           return (ipend);
   }
   
   static int
   sab82532_bfe_probe(struct scc_softc *sc __unused)
   {
   
           return (0);
   }

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