FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/armada38x/pmsu.c

     /*-
      * Copyright (c) 2015 Semihalf.
      * Copyright (c) 2015 Stormshield.
      * 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/12.0/sys/arm/mv/armada38x/pmsu.c 306756 2016-10-06 13:18:18Z mmel $");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/rman.h>
    #include <sys/types.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/resource.h>
    #include <sys/systm.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <machine/cpu.h>
    #include <machine/fdt.h>
    #include <machine/smp.h>
    
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/mv/mvreg.h>
    
    #include "pmsu.h"
    
    static struct resource_spec pmsu_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    struct pmsu_softc {
            device_t        dev;
            struct resource *res;
    };
    
    static int pmsu_probe(device_t dev);
    static int pmsu_attach(device_t dev);
    static int pmsu_detach(device_t dev);
    
    static device_method_t pmsu_methods[] = {
            DEVMETHOD(device_probe,         pmsu_probe),
            DEVMETHOD(device_attach,        pmsu_attach),
            DEVMETHOD(device_detach,        pmsu_detach),
    
            { 0, 0 }
    };
    
    static driver_t pmsu_driver = {
            "pmsu",
            pmsu_methods,
            sizeof(struct pmsu_softc)
    };
    
    static devclass_t pmsu_devclass;
    
    DRIVER_MODULE(pmsu, simplebus, pmsu_driver, pmsu_devclass, 0, 0);
    DRIVER_MODULE(pmsu, ofwbus, pmsu_driver, pmsu_devclass, 0, 0);
    
    static int
    pmsu_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "marvell,armada-380-pmsu"))
                    return (ENXIO);
    
            device_set_desc(dev, "Power Management Service Unit");
    
            return (BUS_PROBE_DEFAULT);
   }
   
   static int
   pmsu_attach(device_t dev)
   {
           struct pmsu_softc *sc;
           int err;
   
           sc = device_get_softc(dev);
           sc->dev = dev;
   
           err = bus_alloc_resources(dev, pmsu_spec, &sc->res);
           if (err != 0) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           return (0);
   }
   
   static int
   pmsu_detach(device_t dev)
   {
           struct pmsu_softc *sc;
   
           sc = device_get_softc(dev);
   
           bus_release_resources(dev, pmsu_spec, &sc->res);
   
           return (0);
   }
   
   #ifdef SMP
   int
   pmsu_boot_secondary_cpu(void)
   {
           bus_space_handle_t vaddr;
           int rv;
   
           rv = bus_space_map(fdtbus_bs_tag, (bus_addr_t)MV_PMSU_BASE, MV_PMSU_REGS_LEN,
               0, &vaddr);
           if (rv != 0)
                   return (rv);
   
           /* Boot cpu1 */
           bus_space_write_4(fdtbus_bs_tag, vaddr, PMSU_BOOT_ADDR_REDIRECT_OFFSET(1),
               pmap_kextract((vm_offset_t)mpentry));
   
           dcache_wbinv_poc_all();
           dsb();
           sev();
   
           bus_space_unmap(fdtbus_bs_tag, vaddr, MV_PMSU_REGS_LEN);
   
           return (0);
   }
   #endif

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