1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 Nathan Whitehorn 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/libkern.h> 33 #include <sys/module.h> 34 #include <sys/pciio.h> 35 36 #include <dev/ofw/openfirm.h> 37 38 #include <dev/pci/pcivar.h> 39 #include <dev/pci/pcireg.h> 40 #include <dev/pci/pci_private.h> 41 42 #include <machine/bus.h> 43 #include <machine/rtas.h> 44 45 #include <powerpc/ofw/ofw_pcibus.h> 46 #include <powerpc/pseries/plpar_iommu.h> 47 48 #include "pci_if.h" 49 #include "iommu_if.h" 50 51 static int plpar_pcibus_probe(device_t); 52 static bus_dma_tag_t plpar_pcibus_get_dma_tag(device_t dev, device_t child); 53 54 /* 55 * Driver methods. 56 */ 57 static device_method_t plpar_pcibus_methods[] = { 58 /* Device interface */ 59 DEVMETHOD(device_probe, plpar_pcibus_probe), 60 61 /* IOMMU functions */ 62 DEVMETHOD(bus_get_dma_tag, plpar_pcibus_get_dma_tag), 63 DEVMETHOD(iommu_map, phyp_iommu_map), 64 DEVMETHOD(iommu_unmap, phyp_iommu_unmap), 65 66 DEVMETHOD_END 67 }; 68 69 DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods, 70 sizeof(struct pci_softc), ofw_pcibus_driver); 71 DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, 0, 0); 72 73 static int 74 plpar_pcibus_probe(device_t dev) 75 { 76 phandle_t rtas; 77 78 if (ofw_bus_get_node(dev) == -1 || !rtas_exists()) 79 return (ENXIO); 80 81 rtas = OF_finddevice("/rtas"); 82 if (!OF_hasprop(rtas, "ibm,hypertas-functions")) 83 return (ENXIO); 84 85 device_set_desc(dev, "POWER Hypervisor PCI bus"); 86 87 return (BUS_PROBE_SPECIFIC); 88 } 89 90 static bus_dma_tag_t 91 plpar_pcibus_get_dma_tag(device_t dev, device_t child) 92 { 93 struct ofw_pcibus_devinfo *dinfo; 94 95 while (device_get_parent(child) != dev) 96 child = device_get_parent(child); 97 98 dinfo = device_get_ivars(child); 99 100 if (dinfo->opd_dma_tag != NULL) 101 return (dinfo->opd_dma_tag); 102 103 bus_dma_tag_create(bus_get_dma_tag(dev), 104 1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, 105 NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, 106 BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->opd_dma_tag); 107 phyp_iommu_set_dma_tag(dev, child, dinfo->opd_dma_tag); 108 109 return (dinfo->opd_dma_tag); 110 } 111