FreeBSD/Linux Kernel Cross Reference
sys/arm/versatile/versatile_scm.c

     /*
      * Copyright (c) 2017 Oleksandr Tymoshenko <gonzo@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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Ben Gray.
     * 4. The name of the company nor the name of the author may be used to
     *    endorse or promote products derived from this software without specific
     *    prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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.
     */
    
    /*
     * SCM - System Control Module
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/arm/versatile/versatile_scm.c 331402 2018-03-23 01:37:31Z gonzo $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/resource.h>
    #include <sys/rman.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "versatile_scm.h"
    
    struct versatile_scm_softc {
            device_t                sc_dev;
            struct resource *       sc_mem_res;
    };
    
    static struct versatile_scm_softc *versatile_scm_sc;
    
    #define versatile_scm_read_4(sc, reg)           \
        bus_read_4((sc)->sc_mem_res, (reg))
    #define versatile_scm_write_4(sc, reg, val)             \
        bus_write_4((sc)->sc_mem_res, (reg), (val))
    
    static int
    versatile_scm_probe(device_t dev)
    {
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "syscon"))
                    return (ENXIO);
    
            if (versatile_scm_sc) {
                    return (EEXIST);
            }
    
            device_set_desc(dev, "Versatile Control Module");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    versatile_scm_attach(device_t dev)
    {
            struct versatile_scm_softc *sc;
            int rid;
    
            sc = device_get_softc(dev);
            sc->sc_dev = dev;
    
            rid = 0;
            sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
    
            if (sc->sc_mem_res == NULL) {
                    device_printf(dev, "could not allocate memory resources\n");
                   return (ENXIO);
           }
   
           versatile_scm_sc = sc;
   
           return (0);
   }
   
   int
   versatile_scm_reg_read_4(uint32_t reg, uint32_t *val)
   {
           if (!versatile_scm_sc)
                   return (ENXIO);
   
           *val = versatile_scm_read_4(versatile_scm_sc, reg);
           return (0);
   }
   
   int
   versatile_scm_reg_write_4(uint32_t reg, uint32_t val)
   {
           if (!versatile_scm_sc)
                   return (ENXIO);
   
           versatile_scm_write_4(versatile_scm_sc, reg, val);
           return (0);
   }
   
   static device_method_t versatile_scm_methods[] = {
           DEVMETHOD(device_probe,         versatile_scm_probe),
           DEVMETHOD(device_attach,        versatile_scm_attach),
   
           DEVMETHOD_END
   };
   
   static driver_t versatile_scm_driver = {
           "scm",
           versatile_scm_methods,
           sizeof(struct versatile_scm_softc),
   };
   
   static devclass_t versatile_scm_devclass;
   
   EARLY_DRIVER_MODULE(versatile_scm, simplebus, versatile_scm_driver, versatile_scm_devclass, 0, 0,
       BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);

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