sys/arch/acorn26/ioc/ioeb.c

   1 /* $NetBSD: ioeb.c,v 1.4 2002/10/02 02:21:21 thorpej Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2000 Ben Harris
   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  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/param.h>
  31
  32 __KERNEL_RCSID(0, "$NetBSD: ioeb.c,v 1.4 2002/10/02 02:21:21 thorpej Exp $");
  33
  34 #include <sys/device.h>
  35 #include <sys/systm.h>
  36
  37 #include <machine/bus.h>
  38
  39 #include <arch/acorn26/iobus/iocvar.h>
  40 #include <arch/acorn26/ioc/ioebreg.h>
  41 #include <arch/acorn26/ioc/ioebvar.h>
  42
  43 struct ioeb_softc {
  44         struct device sc_dev;
  45         bus_space_tag_t sc_iot;
  46         bus_space_handle_t sc_ioh;
  47 };
  48
  49 static int ioeb_match(struct device *, struct cfdata *, void *);
  50 static void ioeb_attach(struct device *, struct device *, void *);
  51
  52 CFATTACH_DECL(ioeb, sizeof(struct ioeb_softc),
  53     ioeb_match, ioeb_attach, NULL, NULL);
  54
  55 struct device *the_ioeb;
  56
  57 /* IOEB is only four bits wide */
  58 #define ioeb_read(t, h, o) (bus_space_read_1(t, h, o) & 0xf)
  59
  60 static int
  61 ioeb_match(struct device *parent, struct cfdata *cf, void *aux)
  62 {
  63         struct ioc_attach_args *ioc = aux;
  64         int id;
  65
  66         id = ioeb_read(ioc->ioc_fast_t, ioc->ioc_fast_h, IOEB_REG_ID);
  67         if (id == IOEB_ID_IOEB)
  68                 return 1;
  69         if (id != 0xf)
  70                 printf("ioeb_match: ID = %x\n", id);
  71         return 0;
  72 }
  73
  74 static void
  75 ioeb_attach(struct device *parent, struct device *self, void *aux)
  76 {
  77         struct ioeb_softc *sc = (void *)self;
  78         struct ioc_attach_args *ioc = aux;
  79
  80         if (the_ioeb == NULL)
  81                 the_ioeb = self;
  82         sc->sc_iot = ioc->ioc_fast_t;
  83         sc->sc_ioh = ioc->ioc_fast_h;
  84         printf("\n");
  85 }
  86
  87 void
  88 ioeb_irq_clear(int mask)
  89 {
  90         struct ioeb_softc *sc = (void *)the_ioeb;
  91
  92         /* The IOEB only controls interrupt 0 */
  93         if (mask & IOEB_IRQ_CLEARABLE_MASK)
  94                 bus_space_write_1(sc->sc_iot, sc->sc_ioh, IOEB_REG_INTRCLR, 0);
  95 }