sys/arch/acorn26/podulebus/unixbp.c

   1 /* $NetBSD: unixbp.c,v 1.6 2009/01/04 00:36:00 bjh21 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  * unixbp.c - driver for the Unix Backplane, found in the R140 etc
  31  */
  32
  33 #include <sys/param.h>
  34
  35 __KERNEL_RCSID(0, "$NetBSD: unixbp.c,v 1.6 2009/01/04 00:36:00 bjh21 Exp $");
  36
  37 #include <sys/device.h>
  38 #include <sys/systm.h>
  39 #include <machine/bus.h>
  40 #include <arch/acorn26/iobus/iocvar.h>
  41 #include <arch/acorn26/podulebus/unixbpreg.h>
  42 #include <arch/acorn26/podulebus/unixbpvar.h>
  43
  44 struct unixbp_softc {
  45         device_t sc_dev;
  46         bus_space_tag_t sc_iot;
  47         bus_space_handle_t sc_ioh;
  48 };
  49
  50 static int unixbp_match(device_t, cfdata_t, void *);
  51 static void unixbp_attach(device_t, device_t, void *);
  52
  53 CFATTACH_DECL_NEW(unixbp, sizeof(struct unixbp_softc),
  54     unixbp_match, unixbp_attach, NULL, NULL);
  55
  56 device_t the_unixbp;
  57
  58 static int
  59 unixbp_match(device_t parent, cfdata_t cf, void *aux)
  60 {
  61         struct ioc_attach_args *ioc = aux;
  62         bus_space_tag_t bst = ioc->ioc_fast_t;
  63         bus_space_handle_t bsh = ioc->ioc_fast_h;
  64
  65         /* Ask to disable all interrupts and check the request lines go low. */
  66         bus_space_write_1(bst, bsh, UNIXBP_REG_MASK, 0);
  67         if ((bus_space_read_1(bst, bsh, UNIXBP_REG_REQUEST) & 0xf) != 0)
  68                 return 0;
  69         /* Re-enable interrupts. */
  70         bus_space_write_1(bst, bsh, UNIXBP_REG_MASK, 0xf);
  71         return 1;
  72 }
  73
  74 static void
  75 unixbp_attach(device_t parent, device_t self, void *aux)
  76 {
  77         struct ioc_attach_args *ioc = aux;
  78         struct unixbp_softc *sc = device_private(self);
  79
  80         sc->sc_dev = self;
  81         if (the_unixbp == NULL)
  82                 the_unixbp = self;
  83         sc->sc_iot = ioc->ioc_fast_t;
  84         sc->sc_ioh = ioc->ioc_fast_h;
  85
  86         aprint_normal("\n");
  87 }
  88
  89 int
  90 unixbp_irq_status_full(void)
  91 {
  92         struct unixbp_softc *sc = device_private(the_unixbp);
  93
  94         if (sc == NULL)
  95                 return 0;
  96         return bus_space_read_1(sc->sc_iot, sc->sc_ioh, UNIXBP_REG_REQUEST)
  97             & 0xf;
  98 }
  99
 100 void
 101 unixbp_irq_setmask(int mask)
 102 {
 103         struct unixbp_softc *sc = device_private(the_unixbp);
 104
 105         if (sc == NULL)
 106                 return;
 107         bus_space_write_1(sc->sc_iot, sc->sc_ioh, UNIXBP_REG_MASK, mask & 0xf);
 108 }