FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/ast.c

     /*      $OpenBSD: ast.c,v 1.20 2022/04/06 18:59:28 naddy Exp $  */
     /*      $NetBSD: ast.c,v 1.28 1996/05/12 23:51:45 mycroft Exp $ */
     
     /*
      * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      * Copyright (c) 1995 Charles Hannum.  All rights reserved.
      *
      * This code is derived from public-domain software written by
      * Roland McGrath.
     *
     * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles Hannum.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * 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/param.h>
    #include <sys/systm.h>
    #include <sys/device.h>
    #include <sys/termios.h>
    
    #include <machine/bus.h>
    #include <machine/intr.h>
    
    #include <dev/isa/isavar.h>
    #include <dev/ic/comreg.h>
    #include <dev/ic/comvar.h>
    
    #define NSLAVES 4
    
    struct ast_softc {
            struct device sc_dev;
            void *sc_ih;
    
            bus_space_tag_t sc_iot;
            int sc_iobase;
    
            int sc_alive;                   /* mask of slave units attached */
            void *sc_slaves[NSLAVES];       /* com device unit numbers */
            bus_space_handle_t sc_slaveioh[NSLAVES];
    };
    
    int astprobe(struct device *, void *, void *);
    void astattach(struct device *, struct device *, void *);
    int astintr(void *);
    int astprint(void *, const char *);
    
    const struct cfattach ast_ca = {
            sizeof(struct ast_softc), astprobe, astattach
    };
    
    struct cfdriver ast_cd = {
            NULL, "ast", DV_TTY
    };
    
    int
    astprobe(struct device *parent, void *self, void *aux)
    {
            struct isa_attach_args *ia = aux;
            int iobase = ia->ia_iobase;
            bus_space_tag_t iot = ia->ia_iot;
            bus_space_handle_t ioh;
            int i, rv = 1;
    
            /*
             * Do the normal com probe for the first UART and assume
             * its presence, and the ability to map the other UARTS,
             * means there is a multiport board there.
             * XXX Needs more robustness.
             */
    
            /* if the first port is in use as console, then it. */
            if (iobase == comconsaddr && !comconsattached)
                    goto checkmappings;
    
            if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
                    rv = 0;
                    goto out;
            }
           rv = comprobe1(iot, ioh);
           bus_space_unmap(iot, ioh, COM_NPORTS);
           if (rv == 0)
                   goto out;
   
   checkmappings:
           for (i = 1; i < NSLAVES; i++) {
                   iobase += COM_NPORTS;
   
                   if (iobase == comconsaddr && !comconsattached)
                           continue;
   
                   if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
                           rv = 0;
                           goto out;
                   }
                   bus_space_unmap(iot, ioh, COM_NPORTS);
           }
   
   out:
           if (rv)
                   ia->ia_iosize = NSLAVES * COM_NPORTS;
           return (rv);
   }
   
   int
   astprint(void *aux, const char *pnp)
   {
           struct commulti_attach_args *ca = aux;
   
           if (pnp)
                   printf("com at %s", pnp);
           printf(" slave %d", ca->ca_slave);
           return (UNCONF);
   }
   
   void
   astattach(struct device *parent, struct device *self, void *aux)
   {
           struct ast_softc *sc = (void *)self;
           struct isa_attach_args *ia = aux;
           struct commulti_attach_args ca;
           int i;
   
           sc->sc_iot = ia->ia_iot;
           sc->sc_iobase = ia->ia_iobase;
   
           for (i = 0; i < NSLAVES; i++)
                   if (bus_space_map(sc->sc_iot, sc->sc_iobase + i * COM_NPORTS,
                       COM_NPORTS, 0, &sc->sc_slaveioh[i]))
                           panic("astattach: couldn't map slave %d", i);
   
           /*
            * Enable the master interrupt.
            */
           bus_space_write_1(sc->sc_iot, sc->sc_slaveioh[3], 7, 0x80);
   
           printf("\n");
   
           for (i = 0; i < NSLAVES; i++) {
                   ca.ca_slave = i;
                   ca.ca_iot = sc->sc_iot;
                   ca.ca_ioh = sc->sc_slaveioh[i];
                   ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
                   ca.ca_noien = 1;
   
                   sc->sc_slaves[i] = config_found(self, &ca, astprint);
                   if (sc->sc_slaves[i] != NULL)
                           sc->sc_alive |= 1 << i;
           }
   
           sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
               IPL_TTY, astintr, sc, sc->sc_dev.dv_xname);
   }
   
   int
   astintr(void *arg)
   {
           struct ast_softc *sc = arg;
           bus_space_tag_t iot = sc->sc_iot;
           int alive = sc->sc_alive;
           int bits;
   
           bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
           if (bits == 0)
                   return (0);
   
           for (;;) {
   #define TRY(n) \
                   if (bits & (1 << (n))) \
                           comintr(sc->sc_slaves[n]);
                   TRY(0);
                   TRY(1);
                   TRY(2);
                   TRY(3);
   #undef TRY
                   bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
                   if (bits == 0)
                           return (1);
           }
   }

Cache object: 5fe2fa5e9d0c44f5d5d93cb8608ba522