sys/dev/isa/ioat66.c

   1 /*      $NetBSD: ioat66.c,v 1.19 2009/05/12 08:44:19 cegger 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, and information provided by David Muir Sharnoff.
   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: ioat66.c,v 1.19 2009/05/12 08:44:19 cegger 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 <sys/bus.h>
  45 #include <sys/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 6
  54
  55 struct ioat66_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         bus_space_handle_t sc_intmasq;
  66 };
  67
  68 int ioatbases[NSLAVES]={0x220,0x228,0x240,0x248,0x260,0x268};
  69 #define IOAT66SHARED 0x208
  70
  71 int ioat66probe(device_t, cfdata_t, void *);
  72 void ioat66attach(device_t, device_t, void *);
  73 int ioat66intr(void *);
  74
  75 CFATTACH_DECL(ioat, sizeof(struct ioat66_softc),
  76     ioat66probe, ioat66attach, NULL, NULL);
  77
  78 int
  79 ioat66probe(device_t parent, cfdata_t self, 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 iobase;
  85         int i, rv = 1;
  86
  87         if (ia->ia_niomem < 1)
  88                 return (0);
  89         if (ia->ia_nirq < 1)
  90                 return (0);
  91         /*
  92          * Do the normal com probe for the first UART and assume
  93          * its presence, and the ability to map the other UARTS,
  94          * means there is a multiport board there.
  95          * XXX Needs more robustness.
  96          */
  97
  98         /* Disallow wildcarded i/o address. */
  99         if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
 100                 return 0;
 101
 102         if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
 103                 return (0);
 104
 105         iobase = ia->ia_io[0].ir_addr;
 106         /* if the first port is in use as console, then it. */
 107         if (com_is_console(iot, iobase, 0))
 108                 goto checkmappings;
 109
 110         if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
 111                 rv = 0;
 112                 goto out;
 113         }
 114         rv = comprobe1(iot, ioh);
 115         bus_space_unmap(iot, ioh, COM_NPORTS);
 116         if (rv == 0)
 117                 goto out;
 118
 119 checkmappings:
 120         for (i = 1; i < NSLAVES; i++) {
 121                 iobase = ioatbases[i];
 122
 123                 if (com_is_console(iot, iobase, 0))
 124                         continue;
 125
 126                 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
 127                         rv = 0;
 128                         goto out;
 129                 }
 130                 bus_space_unmap(iot, ioh, COM_NPORTS);
 131         }
 132
 133 out:
 134         if (rv) {
 135                 ia->ia_nio = 1;
 136                 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
 137                 ia->ia_nirq = 1;
 138                 ia->ia_niomem = 0;
 139                 ia->ia_ndrq = 0;
 140         }
 141         return (rv);
 142 }
 143
 144 void
 145 ioat66attach(device_t parent, device_t self, void *aux)
 146 {
 147         struct ioat66_softc *sc = (void *)self;
 148         struct isa_attach_args *ia = aux;
 149         struct commulti_attach_args ca;
 150         bus_space_tag_t iot = ia->ia_iot;
 151         int i, iobase, irq;
 152
 153         printf("\n");
 154
 155         sc->sc_iot = ia->ia_iot;
 156         sc->sc_iobase = ia->ia_io[0].ir_addr;
 157         irq = ia->ia_irq[0].ir_irq;
 158
 159         for (i = 0; i < NSLAVES; i++) {
 160                 iobase = ioatbases[i];
 161                 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
 162                     bus_space_map(iot, iobase, COM_NPORTS, 0,
 163                         &sc->sc_slaveioh[i])) {
 164                         aprint_error_dev(&sc->sc_dev, "can't map i/o space for slave %d\n", i);
 165                         return;
 166                 }
 167         }
 168
 169         if(bus_space_map(iot, IOAT66SHARED, 1, 0, &sc->sc_intmasq)) {
 170           aprint_error_dev(&sc->sc_dev, "can't map shared interrupt mask\n");
 171           return;
 172         }
 173
 174         for (i = 0; i < NSLAVES; i++) {
 175
 176                 ca.ca_slave = i;
 177                 ca.ca_iot = sc->sc_iot;
 178                 ca.ca_ioh = sc->sc_slaveioh[i];
 179                 ca.ca_iobase = ioatbases[i];
 180                 ca.ca_noien = 0;
 181
 182                 sc->sc_slaves[i] = config_found(self, &ca, commultiprint);
 183                 if (sc->sc_slaves[i] != NULL)
 184                         sc->sc_alive |= 1 << i;
 185         }
 186
 187         sc->sc_ih = isa_intr_establish(ia->ia_ic, irq, IST_EDGE,
 188             IPL_SERIAL, ioat66intr, sc);
 189 }
 190
 191 int
 192 ioat66intr(void *arg)
 193 {
 194         struct ioat66_softc *sc = arg;
 195         bus_space_tag_t iot = sc->sc_iot;
 196         int alive = sc->sc_alive;
 197         int bits;
 198
 199         bits = bus_space_read_1(iot, sc->sc_intmasq, 0) & alive;
 200         if (bits == 0)
 201                 return (0);
 202
 203         for (;;) {
 204 #define TRY(n) \
 205                 if (bits & (1 << (n))) \
 206                         comintr(sc->sc_slaves[n]);
 207                 TRY(0);
 208                 TRY(1);
 209                 TRY(2);
 210                 TRY(3);
 211                 TRY(4);
 212                 TRY(5);
 213 #undef TRY
 214                 bits = bus_space_read_1(iot, sc->sc_intmasq, 0) & alive;
 215                 if (bits == 0)
 216                         return (1);
 217         }
 218 }