The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/lpc/lpc_pwr.c

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    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: releng/10.0/sys/arm/lpc/lpc_pwr.c 239278 2012-08-15 05:37:10Z gonzo $");
   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_is_compatible(dev, "lpc,pwr"))
   69                 return (ENXIO);
   70 
   71         device_set_desc(dev, "LPC32x0 Power Controller");
   72         return (BUS_PROBE_DEFAULT);
   73 }
   74 
   75 static int
   76 lpc_pwr_attach(device_t dev)
   77 {
   78         struct lpc_pwr_softc *sc = device_get_softc(dev);
   79         int rid;
   80 
   81         sc->dp_dev = dev;
   82 
   83         rid = 0;
   84         sc->dp_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 
   85             RF_ACTIVE);
   86         if (!sc->dp_mem_res) {
   87                 device_printf(dev, "cannot allocate memory window\n");
   88                 return (ENXIO);
   89         }
   90 
   91         sc->dp_bst = rman_get_bustag(sc->dp_mem_res);
   92         sc->dp_bsh = rman_get_bushandle(sc->dp_mem_res);
   93 
   94         lpc_pwr_sc = sc;
   95 
   96         return (0);
   97 }
   98 
   99 uint32_t
  100 lpc_pwr_read(device_t dev, int reg)
  101 {
  102         return (lpc_pwr_read_4(lpc_pwr_sc, reg));
  103 }
  104 
  105 void
  106 lpc_pwr_write(device_t dev, int reg, uint32_t value)
  107 {
  108         lpc_pwr_write_4(lpc_pwr_sc, reg, value);
  109 }
  110 
  111 static device_method_t lpc_pwr_methods[] = {
  112         /* Device interface */
  113         DEVMETHOD(device_probe,         lpc_pwr_probe),
  114         DEVMETHOD(device_attach,        lpc_pwr_attach),
  115         { 0, 0 }
  116 };
  117 
  118 static devclass_t lpc_pwr_devclass;
  119 
  120 static driver_t lpc_pwr_driver = {
  121         "pwr",
  122         lpc_pwr_methods,
  123         sizeof(struct lpc_pwr_softc),
  124 };
  125 
  126 DRIVER_MODULE(pwr, simplebus, lpc_pwr_driver, lpc_pwr_devclass, 0, 0);

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