FreeBSD/Linux Kernel Cross Reference
sys/dev/bhnd/cores/chipc/bhnd_pmu_chipc.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2016 Landon Fuller <landon@landonf.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,
     *    without modification.
     * 2. Redistributions in binary form must reproduce at minimum a disclaimer
     *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
     *    redistribution must be conditioned upon including a substantially
     *    similar Disclaimer requirement for further binary redistribution.
     *
     * NO WARRANTY
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
     * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
     * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * ChipCommon attachment support for the bhnd(4) PMU driver.
     * 
     * Supports non-AOB ("Always-on Bus") devices that map the PMU register blocks
     * via the ChipCommon core, rather than vending a distinct PMU core on the
     * bhnd bus.
     */
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/limits.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/systm.h>
    
    #include <dev/bhnd/bhnd.h>
    
    #include <dev/bhnd/cores/pmu/bhnd_pmuvar.h>
    #include <dev/bhnd/cores/pmu/bhnd_pmureg.h>
    
    #include "bhnd_chipc_if.h"
    #include "bhnd_pmu_if.h"
    
    #include "chipcvar.h"
    
    static int
    bhnd_pmu_chipc_probe(device_t dev)
    {
            struct chipc_caps       *ccaps;
            struct chipc_softc      *chipc_sc;
            device_t                 chipc;
            char                     desc[34];
            int                      error;
            uint32_t                 pcaps;
            uint8_t                  rev;
    
            /* Look for chipc parent */
            chipc = device_get_parent(dev);
            if (device_get_devclass(chipc) != devclass_find("bhnd_chipc"))
                    return (ENXIO);
    
            /* Check the chipc PMU capability flag. */
            ccaps = BHND_CHIPC_GET_CAPS(chipc);
            if (!ccaps->pmu)
                    return (ENXIO);
    
            /* Delegate to common driver implementation */
            if ((error = bhnd_pmu_probe(dev)) > 0)
                    return (error);
    
            /* Fetch PMU capability flags */
            chipc_sc = device_get_softc(chipc);
            pcaps = bhnd_bus_read_4(chipc_sc->core, BHND_PMU_CAP);
    
            /* Set description */
            rev = BHND_PMU_GET_BITS(pcaps, BHND_PMU_CAP_REV);
            snprintf(desc, sizeof(desc), "Broadcom ChipCommon PMU, rev %hhu", rev);
            device_set_desc_copy(dev, desc);
    
            return (BUS_PROBE_NOWILDCARD);
    }
    
    static int
    bhnd_pmu_chipc_attach(device_t dev)
   {
           struct chipc_softc      *chipc_sc;
           struct bhnd_resource    *r;
   
           /* Fetch core registers from ChipCommon parent */
           chipc_sc = device_get_softc(device_get_parent(dev));
           r = chipc_sc->core;
   
           return (bhnd_pmu_attach(dev, r));
   }
   
   static device_method_t bhnd_pmu_chipc_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,                 bhnd_pmu_chipc_probe),
           DEVMETHOD(device_attach,                bhnd_pmu_chipc_attach),
   
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_1(bhnd_pmu, bhnd_pmu_chipc_driver, bhnd_pmu_chipc_methods,
       sizeof(struct bhnd_pmu_softc), bhnd_pmu_driver);
   EARLY_DRIVER_MODULE(bhnd_pmu_chipc, bhnd_chipc, bhnd_pmu_chipc_driver,
       NULL, NULL, BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
   
   MODULE_DEPEND(bhnd_pmu_chipc, bhnd, 1, 1, 1);
   MODULE_VERSION(bhnd_pmu_chipc, 1);

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