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

     /*-
      * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.2/sys/arm/lpc/lpc_pwr.c 266152 2014-05-15 16:11:06Z ian $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <machine/bus.h>
    #include <machine/intr.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/lpc/lpcreg.h>
    #include <arm/lpc/lpcvar.h>
    
    struct lpc_pwr_softc {
            device_t                dp_dev;
            struct resource *       dp_mem_res;
            bus_space_tag_t         dp_bst;
            bus_space_handle_t      dp_bsh;
    };
    
    static struct lpc_pwr_softc *lpc_pwr_sc = NULL;
    
    static int lpc_pwr_probe(device_t);
    static int lpc_pwr_attach(device_t);
    
    #define lpc_pwr_read_4(_sc, _reg)                       \
        bus_space_read_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg)
    #define lpc_pwr_write_4(_sc, _reg, _val)                \
        bus_space_write_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg, _val)
    
    static int
    lpc_pwr_probe(device_t dev)
    {
            
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "lpc,pwr"))
                    return (ENXIO);
    
            device_set_desc(dev, "LPC32x0 Power Controller");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    lpc_pwr_attach(device_t dev)
    {
            struct lpc_pwr_softc *sc = device_get_softc(dev);
            int rid;
    
            sc->dp_dev = dev;
    
            rid = 0;
            sc->dp_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 
                RF_ACTIVE);
            if (!sc->dp_mem_res) {
                    device_printf(dev, "cannot allocate memory window\n");
                    return (ENXIO);
            }
    
            sc->dp_bst = rman_get_bustag(sc->dp_mem_res);
            sc->dp_bsh = rman_get_bushandle(sc->dp_mem_res);
    
            lpc_pwr_sc = sc;
    
            return (0);
   }
   
   uint32_t
   lpc_pwr_read(device_t dev, int reg)
   {
           return (lpc_pwr_read_4(lpc_pwr_sc, reg));
   }
   
   void
   lpc_pwr_write(device_t dev, int reg, uint32_t value)
   {
           lpc_pwr_write_4(lpc_pwr_sc, reg, value);
   }
   
   static device_method_t lpc_pwr_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         lpc_pwr_probe),
           DEVMETHOD(device_attach,        lpc_pwr_attach),
           { 0, 0 }
   };
   
   static devclass_t lpc_pwr_devclass;
   
   static driver_t lpc_pwr_driver = {
           "pwr",
           lpc_pwr_methods,
           sizeof(struct lpc_pwr_softc),
   };
   
   DRIVER_MODULE(pwr, simplebus, lpc_pwr_driver, lpc_pwr_devclass, 0, 0);

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