FreeBSD/Linux Kernel Cross Reference
sys/dev/scc/scc_dev_z8530.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_z8530.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/z8530.h>
    
    #include "scc_if.h"
    
    static int z8530_bfe_attach(struct scc_softc *, int);
    static int z8530_bfe_iclear(struct scc_softc *, struct scc_chan *);
    static int z8530_bfe_ipend(struct scc_softc *);
    static int z8530_bfe_probe(struct scc_softc *);
    
    static kobj_method_t z8530_methods[] = {
            KOBJMETHOD(scc_attach,  z8530_bfe_attach),
            KOBJMETHOD(scc_iclear,  z8530_bfe_iclear),
            KOBJMETHOD(scc_ipend,   z8530_bfe_ipend),
            KOBJMETHOD(scc_probe,   z8530_bfe_probe),
            KOBJMETHOD_END
    };
    
    struct scc_class scc_z8530_class = {
            "z8530 class",
            z8530_methods,
            sizeof(struct scc_softc),
            .cl_channels = 2,
            .cl_class = SCC_CLASS_Z8530,
            .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
            .cl_range = CHAN_B - CHAN_A,
    };
    
    /* Multiplexed I/O. */
    static __inline uint8_t
    scc_getmreg(struct scc_bas *bas, int ch, int reg)
    {
    
            scc_setreg(bas, ch + REG_CTRL, reg);
            scc_barrier(bas);
            return (scc_getreg(bas, ch + REG_CTRL));
    }
    
    static int
    z8530_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
    {
    
            return (0);
    }
    
    static int
    z8530_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
    {
            struct scc_bas *bas;
            int c;
    
            bas = &sc->sc_bas;
            c = (ch->ch_nr == 1) ? CHAN_A : CHAN_B;
            mtx_lock_spin(&sc->sc_hwmtx);
            if (ch->ch_ipend & SER_INT_TXIDLE) {
                    scc_setreg(bas, c + REG_CTRL, CR_RSTTXI);
                    scc_barrier(bas);
            }
            if (ch->ch_ipend & SER_INT_RXREADY) {
                    scc_getreg(bas, c + REG_DATA);
                   scc_barrier(bas);
           }
           if (ch->ch_ipend & (SER_INT_OVERRUN|SER_INT_BREAK))
                   scc_setreg(bas, c + REG_CTRL, CR_RSTERR);
           mtx_unlock_spin(&sc->sc_hwmtx);
           return (0);
   }
   
   #define SIGCHG(c, i, s, d)                              \
           if (c) {                                        \
                   i |= (i & s) ? s : s | d;               \
           } else {                                        \
                   i = (i & s) ? (i & ~s) | d : i;         \
           }
   
   static int
   z8530_bfe_ipend(struct scc_softc *sc)
   {
           struct scc_bas *bas;
           struct scc_chan *ch[2];
           uint32_t sig;
           uint8_t bes, ip, src;
   
           bas = &sc->sc_bas;
           ch[0] = &sc->sc_chan[0];
           ch[1] = &sc->sc_chan[1];
           ch[0]->ch_ipend = 0;
           ch[1]->ch_ipend = 0;
   
           mtx_lock_spin(&sc->sc_hwmtx);
           ip = scc_getmreg(bas, CHAN_A, RR_IP);
           if (ip & IP_RIA)
                   ch[0]->ch_ipend |= SER_INT_RXREADY;
           if (ip & IP_RIB)
                   ch[1]->ch_ipend |= SER_INT_RXREADY;
           if (ip & IP_TIA)
                   ch[0]->ch_ipend |= SER_INT_TXIDLE;
           if (ip & IP_TIB)
                   ch[1]->ch_ipend |= SER_INT_TXIDLE;
           if (ip & IP_SIA) {
                   bes = scc_getmreg(bas, CHAN_A, CR_RSTXSI);
                   if (bes & BES_BRK)
                           ch[0]->ch_ipend |= SER_INT_BREAK;
                   sig = ch[0]->ch_hwsig;
                   SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
                   SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
                   SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
                   if (sig & SER_MASK_DELTA) {
                           ch[0]->ch_hwsig = sig;
                           ch[0]->ch_ipend |= SER_INT_SIGCHG;
                   }
                   src = scc_getmreg(bas, CHAN_A, RR_SRC);
                   if (src & SRC_OVR)
                           ch[0]->ch_ipend |= SER_INT_OVERRUN;
           }
           if (ip & IP_SIB) {
                   bes = scc_getmreg(bas, CHAN_B, CR_RSTXSI);
                   if (bes & BES_BRK)
                           ch[1]->ch_ipend |= SER_INT_BREAK;
                   sig = ch[1]->ch_hwsig;
                   SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
                   SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
                   SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
                   if (sig & SER_MASK_DELTA) {
                           ch[1]->ch_hwsig = sig;
                           ch[1]->ch_ipend |= SER_INT_SIGCHG;
                   }
                   src = scc_getmreg(bas, CHAN_B, RR_SRC);
                   if (src & SRC_OVR)
                           ch[1]->ch_ipend |= SER_INT_OVERRUN;
           }
           mtx_unlock_spin(&sc->sc_hwmtx);
   
           return (ch[0]->ch_ipend | ch[1]->ch_ipend);
   }
   
   static int
   z8530_bfe_probe(struct scc_softc *sc __unused)
   {
   
           return (0);
   }

Cache object: ef1624a062e0e0c3eb9e2491a85fb442