sys/mips/rt305x/rt305x_ic.c

   1 /*-
   2  * Copyright (c) 2010 Aleksandr Rybalko.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/bus.h>
  33 #include <sys/interrupt.h>
  34 #include <sys/kernel.h>
  35 #include <sys/module.h>
  36 #include <sys/rman.h>
  37 #include <sys/malloc.h>
  38
  39 #include <machine/bus.h>
  40
  41 #include <mips/rt305x/rt305xreg.h>
  42 #include <mips/rt305x/rt305x_icvar.h>
  43
  44
  45 static int      rt305x_ic_probe(device_t);
  46 static int      rt305x_ic_attach(device_t);
  47 static int      rt305x_ic_detach(device_t);
  48
  49
  50 static struct rt305x_ic_softc *rt305x_ic_softc = NULL;
  51
  52 static int
  53 rt305x_ic_probe(device_t dev)
  54 {
  55         device_set_desc(dev, "RT305X Interrupt Controller driver");
  56         return (0);
  57 }
  58
  59 static int
  60 rt305x_ic_attach(device_t dev)
  61 {
  62         struct rt305x_ic_softc *sc = device_get_softc(dev);
  63         int error = 0;
  64
  65         KASSERT((device_get_unit(dev) == 0),
  66             ("rt305x_ic: Only one Interrupt Controller module supported"));
  67
  68         if (rt305x_ic_softc != NULL)
  69                 return (ENXIO);
  70         rt305x_ic_softc = sc;
  71
  72
  73         /* Map control/status registers. */
  74         sc->mem_rid = 0;
  75         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  76             &sc->mem_rid, RF_ACTIVE);
  77
  78         if (sc->mem_res == NULL) {
  79                 device_printf(dev, "couldn't map memory\n");
  80                 error = ENXIO;
  81                 rt305x_ic_detach(dev);
  82                 return(error);
  83         }
  84         return (bus_generic_attach(dev));
  85 }
  86
  87 static int
  88 rt305x_ic_detach(device_t dev)
  89 {
  90         struct rt305x_ic_softc *sc = device_get_softc(dev);
  91
  92         bus_generic_detach(dev);
  93
  94         if (sc->mem_res)
  95                 bus_release_resource(dev, SYS_RES_MEMORY, sc->mem_rid,
  96                     sc->mem_res);
  97         return(0);
  98 }
  99
 100
 101 uint32_t
 102 rt305x_ic_get(uint32_t reg)
 103 {
 104         struct rt305x_ic_softc *sc = rt305x_ic_softc;
 105
 106         if (!sc)
 107                 return (0);
 108
 109         return (bus_read_4(sc->mem_res, reg));
 110 }
 111
 112 void
 113 rt305x_ic_set(uint32_t reg, uint32_t val)
 114 {
 115         struct rt305x_ic_softc *sc = rt305x_ic_softc;
 116
 117         if (!sc)
 118                 return;
 119
 120         bus_write_4(sc->mem_res, reg, val);
 121
 122         return;
 123 }
 124
 125
 126 static device_method_t rt305x_ic_methods[] = {
 127         DEVMETHOD(device_probe,                 rt305x_ic_probe),
 128         DEVMETHOD(device_attach,                rt305x_ic_attach),
 129         DEVMETHOD(device_detach,                rt305x_ic_detach),
 130
 131         {0, 0},
 132 };
 133
 134 static driver_t rt305x_ic_driver = {
 135         "rt305x_ic",
 136         rt305x_ic_methods,
 137         sizeof(struct rt305x_ic_softc),
 138 };
 139 static devclass_t rt305x_ic_devclass;
 140
 141 DRIVER_MODULE(rt305x_ic, obio, rt305x_ic_driver, rt305x_ic_devclass, 0, 0);