scc_dev_z8530.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004-2006 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <machine/bus.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 #include <sys/rman.h>
   40 #include <sys/serial.h>
   41 
   42 #include <dev/scc/scc_bfe.h>
   43 #include <dev/scc/scc_bus.h>
   44 
   45 #include <dev/ic/z8530.h>
   46 
   47 #include "scc_if.h"
   48 
   49 static int z8530_bfe_attach(struct scc_softc *, int);
   50 static int z8530_bfe_iclear(struct scc_softc *, struct scc_chan *);
   51 static int z8530_bfe_ipend(struct scc_softc *);
   52 static int z8530_bfe_probe(struct scc_softc *);
   53 
   54 /* Channel B is always at 0 offset. */
   55 #define CHAN_A  (-(sc->sc_class->cl_range))
   56 #define CHAN_B  0
   57 
   58 static kobj_method_t z8530_methods[] = {
   59         KOBJMETHOD(scc_attach,  z8530_bfe_attach),
   60         KOBJMETHOD(scc_iclear,  z8530_bfe_iclear),
   61         KOBJMETHOD(scc_ipend,   z8530_bfe_ipend),
   62         KOBJMETHOD(scc_probe,   z8530_bfe_probe),
   63         KOBJMETHOD_END
   64 };
   65 
   66 /*
   67  * escc (macio) spacing.
   68  */
   69 struct scc_class scc_z8530_escc_class = {
   70         "z8530 escc class",
   71         z8530_methods,
   72         sizeof(struct scc_softc),
   73         .cl_channels = 2,
   74         .cl_class = SCC_CLASS_Z8530,
   75         .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
   76         /* Negative .cl_range signifies this is channel spacing. */
   77         .cl_range = (CHAN_B - 16),
   78 };
   79 
   80 /*
   81  * SUN compatible channel spacing.
   82  */
   83 struct scc_class scc_z8530_legacy_class = {
   84         "z8530 legacy class",
   85         z8530_methods,
   86         sizeof(struct scc_softc),
   87         .cl_channels = 2,
   88         .cl_class = SCC_CLASS_Z8530,
   89         .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
   90         /* Negative .cl_range signifies this is channel spacing. */
   91         .cl_range = (CHAN_B - 2),
   92 };
   93 
   94 /* Multiplexed I/O. */
   95 static __inline uint8_t
   96 scc_getmreg(struct scc_bas *bas, int ch, int reg)
   97 {
   98 
   99         scc_setreg(bas, ch + REG_CTRL, reg);
  100         scc_barrier(bas);
  101         return (scc_getreg(bas, ch + REG_CTRL));
  102 }
  103 
  104 static int
  105 z8530_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
  106 {
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 z8530_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
  113 {
  114         struct scc_bas *bas;
  115         int c;
  116 
  117         bas = &sc->sc_bas;
  118         c = (ch->ch_nr == 1) ? CHAN_A : CHAN_B;
  119         mtx_lock_spin(&sc->sc_hwmtx);
  120         if (ch->ch_ipend & SER_INT_TXIDLE) {
  121                 scc_setreg(bas, c + REG_CTRL, CR_RSTTXI);
  122                 scc_barrier(bas);
  123         }
  124         if (ch->ch_ipend & SER_INT_RXREADY) {
  125                 scc_getreg(bas, c + REG_DATA);
  126                 scc_barrier(bas);
  127         }
  128         if (ch->ch_ipend & (SER_INT_OVERRUN|SER_INT_BREAK))
  129                 scc_setreg(bas, c + REG_CTRL, CR_RSTERR);
  130         mtx_unlock_spin(&sc->sc_hwmtx);
  131         return (0);
  132 }
  133 
  134 #define SIGCHG(c, i, s, d)                              \
  135         if (c) {                                        \
  136                 i |= (i & s) ? s : s | d;               \
  137         } else {                                        \
  138                 i = (i & s) ? (i & ~s) | d : i;         \
  139         }
  140 
  141 static int
  142 z8530_bfe_ipend(struct scc_softc *sc)
  143 {
  144         struct scc_bas *bas;
  145         struct scc_chan *ch[2];
  146         uint32_t sig;
  147         uint8_t bes, ip, src;
  148 
  149         bas = &sc->sc_bas;
  150         ch[0] = &sc->sc_chan[0];
  151         ch[1] = &sc->sc_chan[1];
  152         ch[0]->ch_ipend = 0;
  153         ch[1]->ch_ipend = 0;
  154 
  155         mtx_lock_spin(&sc->sc_hwmtx);
  156         ip = scc_getmreg(bas, CHAN_A, RR_IP);
  157         if (ip & IP_RIA)
  158                 ch[0]->ch_ipend |= SER_INT_RXREADY;
  159         if (ip & IP_RIB)
  160                 ch[1]->ch_ipend |= SER_INT_RXREADY;
  161         if (ip & IP_TIA)
  162                 ch[0]->ch_ipend |= SER_INT_TXIDLE;
  163         if (ip & IP_TIB)
  164                 ch[1]->ch_ipend |= SER_INT_TXIDLE;
  165         if (ip & IP_SIA) {
  166                 bes = scc_getmreg(bas, CHAN_A, CR_RSTXSI);
  167                 if (bes & BES_BRK)
  168                         ch[0]->ch_ipend |= SER_INT_BREAK;
  169                 sig = ch[0]->ch_hwsig;
  170                 SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
  171                 SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
  172                 SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
  173                 if (sig & SER_MASK_DELTA) {
  174                         ch[0]->ch_hwsig = sig;
  175                         ch[0]->ch_ipend |= SER_INT_SIGCHG;
  176                 }
  177                 src = scc_getmreg(bas, CHAN_A, RR_SRC);
  178                 if (src & SRC_OVR)
  179                         ch[0]->ch_ipend |= SER_INT_OVERRUN;
  180         }
  181         if (ip & IP_SIB) {
  182                 bes = scc_getmreg(bas, CHAN_B, CR_RSTXSI);
  183                 if (bes & BES_BRK)
  184                         ch[1]->ch_ipend |= SER_INT_BREAK;
  185                 sig = ch[1]->ch_hwsig;
  186                 SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
  187                 SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
  188                 SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
  189                 if (sig & SER_MASK_DELTA) {
  190                         ch[1]->ch_hwsig = sig;
  191                         ch[1]->ch_ipend |= SER_INT_SIGCHG;
  192                 }
  193                 src = scc_getmreg(bas, CHAN_B, RR_SRC);
  194                 if (src & SRC_OVR)
  195                         ch[1]->ch_ipend |= SER_INT_OVERRUN;
  196         }
  197         mtx_unlock_spin(&sc->sc_hwmtx);
  198 
  199         return (ch[0]->ch_ipend | ch[1]->ch_ipend);
  200 }
  201 
  202 static int
  203 z8530_bfe_probe(struct scc_softc *sc __unused)
  204 {
  205 
  206         return (0);
  207 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/scc/scc_dev_z8530.c

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sys/dev/scc/scc_dev_z8530.c