FreeBSD/Linux Kernel Cross Reference
sys/dev/scc/scc_dev_quicc.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: releng/11.2/sys/dev/scc/scc_dev_quicc.c 331722 2018-03-29 02:50:57Z eadler $");
    
    #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/quicc.h>
    
    #include "scc_if.h"
    
    #define quicc_read2(bas, reg)           \
            bus_space_read_2((bas)->bst, (bas)->bsh, reg)
    #define quicc_read4(bas, reg)           \
            bus_space_read_4((bas)->bst, (bas)->bsh, reg)
    
    #define quicc_write2(bas, reg, val)     \
            bus_space_write_2((bas)->bst, (bas)->bsh, reg, val)
    #define quicc_write4(bas, reg, val)     \
            bus_space_write_4((bas)->bst, (bas)->bsh, reg, val)
    
    static int quicc_bfe_attach(struct scc_softc *, int);
    static int quicc_bfe_enabled(struct scc_softc *, struct scc_chan *);
    static int quicc_bfe_iclear(struct scc_softc *, struct scc_chan *);
    static int quicc_bfe_ipend(struct scc_softc *);
    static int quicc_bfe_probe(struct scc_softc *);
    
    static kobj_method_t quicc_methods[] = {
            KOBJMETHOD(scc_attach,  quicc_bfe_attach),
            KOBJMETHOD(scc_enabled, quicc_bfe_enabled),
            KOBJMETHOD(scc_iclear,  quicc_bfe_iclear),
            KOBJMETHOD(scc_ipend,   quicc_bfe_ipend),
            KOBJMETHOD(scc_probe,   quicc_bfe_probe),
            KOBJMETHOD_END
    };
    
    struct scc_class scc_quicc_class = {
            "QUICC class",
            quicc_methods,
            sizeof(struct scc_softc),
            .cl_channels = 4,
            .cl_class = SCC_CLASS_QUICC,
            .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
            .cl_range = 0,
    };
    
    static int
    quicc_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
    {
    
            return (0);
    }
    
    static int
    quicc_bfe_enabled(struct scc_softc *sc, struct scc_chan *ch)
    {
            struct scc_bas *bas;
            int unit;
            uint16_t val0, val1;
    
            bas = &sc->sc_bas;
            unit = ch->ch_nr - 1;
            val0 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));
            quicc_write2(bas, QUICC_REG_SCC_TODR(unit), ~val0);
            val1 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));
            quicc_write2(bas, QUICC_REG_SCC_TODR(unit), val0);
           return (((val0 | val1) == 0x8000) ? 1 : 0);
   }
   
   static int
   quicc_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
   {
           struct scc_bas *bas;
           uint16_t rb, st;
   
           bas = &sc->sc_bas;
           mtx_lock_spin(&sc->sc_hwmtx);
           if (ch->ch_ipend & SER_INT_RXREADY) {
                   rb = quicc_read2(bas, QUICC_PRAM_SCC_RBASE(ch->ch_nr - 1));
                   st = quicc_read2(bas, rb);
                   (void)quicc_read4(bas, rb + 4);
                   quicc_write2(bas, rb, st | 0x9000);
           }
           mtx_unlock_spin(&sc->sc_hwmtx);
           return (0);
   }
   
   static int
   quicc_bfe_ipend(struct scc_softc *sc)
   {
           struct scc_bas *bas;
           struct scc_chan *ch;
           int c, ipend;
           uint16_t scce;
   
           bas = &sc->sc_bas;
           ipend = 0;
           for (c = 0; c < 4; c++) {
                   ch = &sc->sc_chan[c];
                   if (!ch->ch_enabled)
                           continue;
                   ch->ch_ipend = 0;
                   mtx_lock_spin(&sc->sc_hwmtx);
                   scce = quicc_read2(bas, QUICC_REG_SCC_SCCE(c));
                   quicc_write2(bas, QUICC_REG_SCC_SCCE(c), ~0);
                   mtx_unlock_spin(&sc->sc_hwmtx);
                   if (scce & 0x0001)
                           ch->ch_ipend |= SER_INT_RXREADY;
                   if (scce & 0x0002)
                           ch->ch_ipend |= SER_INT_TXIDLE;
                   if (scce & 0x0004)
                           ch->ch_ipend |= SER_INT_OVERRUN;
                   if (scce & 0x0020)
                           ch->ch_ipend |= SER_INT_BREAK;
                   /* XXX SIGNALS */
                   ipend |= ch->ch_ipend;
           }
           return (ipend);
   }
   
   static int
   quicc_bfe_probe(struct scc_softc *sc __unused)
   {
   
           return (0);
   }

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