sys/dev/isa/ast.c

   1 /*      $NetBSD: ast.c,v 1.63 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.
   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 1.63 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 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 softc pointers */
  64         bus_space_handle_t sc_slaveioh[NSLAVES];
  65 };
  66
  67 int astprobe(device_t, cfdata_t, void *);
  68 void astattach(device_t, device_t, void *);
  69 int astintr(void *);
  70
  71 CFATTACH_DECL(ast, sizeof(struct ast_softc),
  72     astprobe, astattach, NULL, NULL);
  73
  74 int
  75 astprobe(device_t parent, cfdata_t self, void *aux)
  76 {
  77         struct isa_attach_args *ia = aux;
  78         bus_space_tag_t iot = ia->ia_iot;
  79         bus_space_handle_t ioh;
  80         int i, iobase, rv = 1;
  81
  82         /*
  83          * Do the normal com probe for the first UART and assume
  84          * its presence, and the ability to map the other UARTS,
  85          * means there is a multiport board there.
  86          * XXX Needs more robustness.
  87          */
  88
  89         if (ia->ia_nio < 1)
  90                 return (0);
  91         if (ia->ia_nirq < 1)
  92                 return (0);
  93
  94         if (ISA_DIRECT_CONFIG(ia))
  95                 return (0);
  96
  97         /* Disallow wildcarded i/o address. */
  98         if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
  99                 return (0);
 100
 101         if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
 102                 return (0);
 103
 104         /* if the first port is in use as console, then it. */
 105         if (com_is_console(iot, ia->ia_io[0].ir_addr, 0))
 106                 goto checkmappings;
 107
 108         if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) {
 109                 rv = 0;
 110                 goto out;
 111         }
 112         rv = comprobe1(iot, ioh);
 113         bus_space_unmap(iot, ioh, COM_NPORTS);
 114         if (rv == 0)
 115                 goto out;
 116
 117 checkmappings:
 118         for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) {
 119                 iobase += COM_NPORTS;
 120
 121                 if (com_is_console(iot, iobase, 0))
 122                         continue;
 123
 124                 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
 125                         rv = 0;
 126                         goto out;
 127                 }
 128                 bus_space_unmap(iot, ioh, COM_NPORTS);
 129         }
 130
 131 out:
 132         if (rv) {
 133                 ia->ia_nio = 1;
 134                 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
 135
 136                 ia->ia_nirq = 1;
 137
 138                 ia->ia_niomem = 0;
 139                 ia->ia_ndrq = 0;
 140         }
 141         return (rv);
 142 }
 143
 144 void
 145 astattach(device_t parent, device_t self, void *aux)
 146 {
 147         struct ast_softc *sc = device_private(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;
 152         device_t slave;
 153
 154         printf("\n");
 155
 156         sc->sc_iot = ia->ia_iot;
 157         sc->sc_iobase = ia->ia_io[0].ir_addr;
 158
 159         for (i = 0; i < NSLAVES; i++) {
 160                 iobase = sc->sc_iobase + i * COM_NPORTS;
 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         /*
 170          * Enable the master interrupt.
 171          */
 172         bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80);
 173
 174         for (i = 0; i < NSLAVES; i++) {
 175                 ca.ca_slave = i;
 176                 ca.ca_iot = sc->sc_iot;
 177                 ca.ca_ioh = sc->sc_slaveioh[i];
 178                 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
 179                 ca.ca_noien = 1;
 180
 181                 slave = config_found(self, &ca, commultiprint);
 182                 if (slave != NULL) {
 183                         sc->sc_alive |= 1 << i;
 184                         sc->sc_slaves[i] = device_private(slave);
 185                 }
 186         }
 187
 188         sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
 189             IST_EDGE, IPL_SERIAL, astintr, sc);
 190 }
 191
 192 int
 193 astintr(void *arg)
 194 {
 195         struct ast_softc *sc = arg;
 196         bus_space_tag_t iot = sc->sc_iot;
 197         int alive = sc->sc_alive;
 198         int bits;
 199
 200         bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive;
 201         if (bits == 0)
 202                 return (0);
 203
 204         for (;;) {
 205 #define TRY(n) \
 206                 if (bits & (1 << (n))) \
 207                         comintr(sc->sc_slaves[n]);
 208                 TRY(0);
 209                 TRY(1);
 210                 TRY(2);
 211                 TRY(3);
 212 #undef TRY
 213                 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3],
 214                     com_scratch) & alive;
 215                 if (bits == 0)
 216                         return (1);
 217         }
 218 }