sys/arm/lpc/lpc_pwr.c

   1 /*-
   2  * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
   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
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/bus.h>
  34 #include <sys/kernel.h>
  35 #include <sys/module.h>
  36 #include <sys/malloc.h>
  37 #include <sys/rman.h>
  38 #include <machine/bus.h>
  39 #include <machine/intr.h>
  40
  41 #include <dev/ofw/ofw_bus.h>
  42 #include <dev/ofw/ofw_bus_subr.h>
  43
  44 #include <arm/lpc/lpcreg.h>
  45 #include <arm/lpc/lpcvar.h>
  46
  47 struct lpc_pwr_softc {
  48         device_t                dp_dev;
  49         struct resource *       dp_mem_res;
  50         bus_space_tag_t         dp_bst;
  51         bus_space_handle_t      dp_bsh;
  52 };
  53
  54 static struct lpc_pwr_softc *lpc_pwr_sc = NULL;
  55
  56 static int lpc_pwr_probe(device_t);
  57 static int lpc_pwr_attach(device_t);
  58
  59 #define lpc_pwr_read_4(_sc, _reg)                       \
  60     bus_space_read_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg)
  61 #define lpc_pwr_write_4(_sc, _reg, _val)                \
  62     bus_space_write_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg, _val)
  63
  64 static int
  65 lpc_pwr_probe(device_t dev)
  66 {
  67
  68         if (!ofw_bus_status_okay(dev))
  69                 return (ENXIO);
  70
  71         if (!ofw_bus_is_compatible(dev, "lpc,pwr"))
  72                 return (ENXIO);
  73
  74         device_set_desc(dev, "LPC32x0 Power Controller");
  75         return (BUS_PROBE_DEFAULT);
  76 }
  77
  78 static int
  79 lpc_pwr_attach(device_t dev)
  80 {
  81         struct lpc_pwr_softc *sc = device_get_softc(dev);
  82         int rid;
  83
  84         sc->dp_dev = dev;
  85
  86         rid = 0;
  87         sc->dp_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  88             RF_ACTIVE);
  89         if (!sc->dp_mem_res) {
  90                 device_printf(dev, "cannot allocate memory window\n");
  91                 return (ENXIO);
  92         }
  93
  94         sc->dp_bst = rman_get_bustag(sc->dp_mem_res);
  95         sc->dp_bsh = rman_get_bushandle(sc->dp_mem_res);
  96
  97         lpc_pwr_sc = sc;
  98
  99         return (0);
 100 }
 101
 102 uint32_t
 103 lpc_pwr_read(device_t dev, int reg)
 104 {
 105         return (lpc_pwr_read_4(lpc_pwr_sc, reg));
 106 }
 107
 108 void
 109 lpc_pwr_write(device_t dev, int reg, uint32_t value)
 110 {
 111         lpc_pwr_write_4(lpc_pwr_sc, reg, value);
 112 }
 113
 114 static device_method_t lpc_pwr_methods[] = {
 115         /* Device interface */
 116         DEVMETHOD(device_probe,         lpc_pwr_probe),
 117         DEVMETHOD(device_attach,        lpc_pwr_attach),
 118         { 0, 0 }
 119 };
 120
 121 static devclass_t lpc_pwr_devclass;
 122
 123 static driver_t lpc_pwr_driver = {
 124         "pwr",
 125         lpc_pwr_methods,
 126         sizeof(struct lpc_pwr_softc),
 127 };
 128
 129 DRIVER_MODULE(pwr, simplebus, lpc_pwr_driver, lpc_pwr_devclass, 0, 0);