FreeBSD/Linux Kernel Cross Reference
sys/powerpc/pseries/plpar_pcibus.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 Nathan Whitehorn
      * 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("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/libkern.h>
    #include <sys/module.h>
    #include <sys/pciio.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pci_private.h>
    
    #include <machine/bus.h>
    #include <machine/rtas.h>
    
    #include <powerpc/ofw/ofw_pcibus.h>
    #include <powerpc/pseries/plpar_iommu.h>
    
    #include "pci_if.h"
    #include "iommu_if.h"
    
    static int              plpar_pcibus_probe(device_t);
    static bus_dma_tag_t    plpar_pcibus_get_dma_tag(device_t dev, device_t child);
    
    /*
     * Driver methods.
     */
    static device_method_t  plpar_pcibus_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         plpar_pcibus_probe),
    
            /* IOMMU functions */
            DEVMETHOD(bus_get_dma_tag,      plpar_pcibus_get_dma_tag),
            DEVMETHOD(iommu_map,            phyp_iommu_map),
            DEVMETHOD(iommu_unmap,          phyp_iommu_unmap),
    
            DEVMETHOD_END
    };
    
    DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods,
        sizeof(struct pci_softc), ofw_pcibus_driver);
    DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, 0, 0);
    
    static int
    plpar_pcibus_probe(device_t dev)
    {
            phandle_t rtas;
    
            if (ofw_bus_get_node(dev) == -1 || !rtas_exists())
                    return (ENXIO);
    
            rtas = OF_finddevice("/rtas");
            if (!OF_hasprop(rtas, "ibm,hypertas-functions"))
                    return (ENXIO);
    
            device_set_desc(dev, "POWER Hypervisor PCI bus");
    
            return (BUS_PROBE_SPECIFIC);
    }
    
    static bus_dma_tag_t
    plpar_pcibus_get_dma_tag(device_t dev, device_t child)
    {
            struct ofw_pcibus_devinfo *dinfo;
    
            while (device_get_parent(child) != dev)
                    child = device_get_parent(child);
   
           dinfo = device_get_ivars(child);
   
           if (dinfo->opd_dma_tag != NULL)
                   return (dinfo->opd_dma_tag);
   
           bus_dma_tag_create(bus_get_dma_tag(dev),
               1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
               NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED,
               BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->opd_dma_tag);
           phyp_iommu_set_dma_tag(dev, child, dinfo->opd_dma_tag);
   
           return (dinfo->opd_dma_tag);
   }

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