ast.c

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    1 /*      $NetBSD: ast.c,v 1.52 2003/01/01 00:10:20 thorpej Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
    5  * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
    6  *
    7  * This code is derived from public-domain software written by
    8  * Roland McGrath.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Charles M. Hannum.
   21  * 4. The name of the author may not be used to endorse or promote products
   22  *    derived from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __KERNEL_RCSID(0, "$NetBSD: ast.c,v 1.52 2003/01/01 00:10:20 thorpej Exp $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/device.h>
   42 #include <sys/termios.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/intr.h>
   46 
   47 #include <dev/ic/comreg.h>
   48 #include <dev/ic/comvar.h>
   49 
   50 #include <dev/isa/isavar.h>
   51 #include <dev/isa/com_multi.h>
   52 
   53 #define NSLAVES 4
   54 
   55 struct ast_softc {
   56         struct device sc_dev;
   57         void *sc_ih;
   58 
   59         bus_space_tag_t sc_iot;
   60         int sc_iobase;
   61 
   62         int sc_alive;                   /* mask of slave units attached */
   63         void *sc_slaves[NSLAVES];       /* com device unit numbers */
   64         bus_space_handle_t sc_slaveioh[NSLAVES];
   65 };
   66 
   67 int astprobe __P((struct device *, struct cfdata *, void *));
   68 void astattach __P((struct device *, struct device *, void *));
   69 int astintr __P((void *));
   70 int astprint __P((void *, const char *));
   71 
   72 CFATTACH_DECL(ast, sizeof(struct ast_softc),
   73     astprobe, astattach, NULL, NULL);
   74 
   75 int
   76 astprobe(parent, self, aux)
   77         struct device *parent;
   78         struct cfdata *self;
   79         void *aux;
   80 {
   81         struct isa_attach_args *ia = aux;
   82         bus_space_tag_t iot = ia->ia_iot;
   83         bus_space_handle_t ioh;
   84         int i, iobase, rv = 1;
   85 
   86         /*
   87          * Do the normal com probe for the first UART and assume
   88          * its presence, and the ability to map the other UARTS,
   89          * means there is a multiport board there.
   90          * XXX Needs more robustness.
   91          */
   92 
   93         if (ia->ia_nio < 1)
   94                 return (0);
   95         if (ia->ia_nirq < 1)
   96                 return (0);
   97 
   98         if (ISA_DIRECT_CONFIG(ia))
   99                 return (0);
  100 
  101         /* Disallow wildcarded i/o address. */
  102         if (ia->ia_io[0].ir_addr == ISACF_PORT_DEFAULT)
  103                 return (0);
  104 
  105         if (ia->ia_irq[0].ir_irq == ISACF_IRQ_DEFAULT)
  106                 return (0);
  107 
  108         /* if the first port is in use as console, then it. */
  109         if (com_is_console(iot, ia->ia_io[0].ir_addr, 0))
  110                 goto checkmappings;
  111 
  112         if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) {
  113                 rv = 0;
  114                 goto out;
  115         }
  116         rv = comprobe1(iot, ioh);
  117         bus_space_unmap(iot, ioh, COM_NPORTS);
  118         if (rv == 0)
  119                 goto out;
  120 
  121 checkmappings:
  122         for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) {
  123                 iobase += COM_NPORTS;
  124 
  125                 if (com_is_console(iot, iobase, 0))
  126                         continue;
  127 
  128                 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
  129                         rv = 0;
  130                         goto out;
  131                 }
  132                 bus_space_unmap(iot, ioh, COM_NPORTS);
  133         }
  134 
  135 out:
  136         if (rv) {
  137                 ia->ia_nio = 1;
  138                 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
  139 
  140                 ia->ia_nirq = 1;
  141 
  142                 ia->ia_niomem = 0;
  143                 ia->ia_ndrq = 0;
  144         }
  145         return (rv);
  146 }
  147 
  148 int
  149 astprint(aux, pnp)
  150         void *aux;
  151         const char *pnp;
  152 {
  153         struct commulti_attach_args *ca = aux;
  154 
  155         if (pnp)
  156                 aprint_normal("com at %s", pnp);
  157         aprint_normal(" slave %d", ca->ca_slave);
  158         return (UNCONF);
  159 }
  160 
  161 void
  162 astattach(parent, self, aux)
  163         struct device *parent, *self;
  164         void *aux;
  165 {
  166         struct ast_softc *sc = (void *)self;
  167         struct isa_attach_args *ia = aux;
  168         struct commulti_attach_args ca;
  169         bus_space_tag_t iot = ia->ia_iot;
  170         int i, iobase;
  171 
  172         printf("\n");
  173 
  174         sc->sc_iot = ia->ia_iot;
  175         sc->sc_iobase = ia->ia_io[0].ir_addr;
  176 
  177         for (i = 0; i < NSLAVES; i++) {
  178                 iobase = sc->sc_iobase + i * COM_NPORTS;
  179                 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
  180                     bus_space_map(iot, iobase, COM_NPORTS, 0,
  181                         &sc->sc_slaveioh[i])) {
  182                         printf("%s: can't map i/o space for slave %d\n",
  183                             sc->sc_dev.dv_xname, i);
  184                         return;
  185                 }
  186         }
  187 
  188         /*
  189          * Enable the master interrupt.
  190          */
  191         bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80);
  192 
  193         for (i = 0; i < NSLAVES; i++) {
  194                 ca.ca_slave = i;
  195                 ca.ca_iot = sc->sc_iot;
  196                 ca.ca_ioh = sc->sc_slaveioh[i];
  197                 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
  198                 ca.ca_noien = 1;
  199 
  200                 sc->sc_slaves[i] = config_found(self, &ca, astprint);
  201                 if (sc->sc_slaves[i] != NULL)
  202                         sc->sc_alive |= 1 << i;
  203         }
  204 
  205         sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
  206             IST_EDGE, IPL_SERIAL, astintr, sc);
  207 }
  208 
  209 int
  210 astintr(arg)
  211         void *arg;
  212 {
  213         struct ast_softc *sc = arg;
  214         bus_space_tag_t iot = sc->sc_iot;
  215         int alive = sc->sc_alive;
  216         int bits;
  217 
  218         bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive;
  219         if (bits == 0)
  220                 return (0);
  221 
  222         for (;;) {
  223 #define TRY(n) \
  224                 if (bits & (1 << (n))) \
  225                         comintr(sc->sc_slaves[n]);
  226                 TRY(0);
  227                 TRY(1);
  228                 TRY(2);
  229                 TRY(3);
  230 #undef TRY
  231                 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3],
  232                     com_scratch) & alive;
  233                 if (bits == 0)
  234                         return (1);
  235         }
  236 }

Cache object: 5fa6d80819892708604362fcd1f3b615

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

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sys/dev/isa/ast.c