1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/libkern.h> 36 #include <sys/module.h> 37 #include <sys/pciio.h> 38 39 #include <dev/ofw/openfirm.h> 40 41 #include <dev/pci/pcivar.h> 42 #include <dev/pci/pcireg.h> 43 #include <dev/pci/pci_private.h> 44 45 #include <machine/bus.h> 46 #include <machine/rtas.h> 47 48 #include <powerpc/ofw/ofw_pcibus.h> 49 #include <powerpc/pseries/plpar_iommu.h> 50 51 #include "pci_if.h" 52 #include "iommu_if.h" 53 54 static int plpar_pcibus_probe(device_t); 55 static bus_dma_tag_t plpar_pcibus_get_dma_tag(device_t dev, device_t child); 56 57 /* 58 * Driver methods. 59 */ 60 static device_method_t plpar_pcibus_methods[] = { 61 /* Device interface */ 62 DEVMETHOD(device_probe, plpar_pcibus_probe), 63 64 /* IOMMU functions */ 65 DEVMETHOD(bus_get_dma_tag, plpar_pcibus_get_dma_tag), 66 DEVMETHOD(iommu_map, phyp_iommu_map), 67 DEVMETHOD(iommu_unmap, phyp_iommu_unmap), 68 69 DEVMETHOD_END 70 }; 71 72 static devclass_t pci_devclass; 73 DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods, 74 sizeof(struct pci_softc), ofw_pcibus_driver); 75 DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, pci_devclass, 0, 0); 76 77 static int 78 plpar_pcibus_probe(device_t dev) 79 { 80 phandle_t rtas; 81 82 if (ofw_bus_get_node(dev) == -1 || !rtas_exists()) 83 return (ENXIO); 84 85 rtas = OF_finddevice("/rtas"); 86 if (!OF_hasprop(rtas, "ibm,hypertas-functions")) 87 return (ENXIO); 88 89 device_set_desc(dev, "POWER Hypervisor PCI bus"); 90 91 return (BUS_PROBE_SPECIFIC); 92 } 93 94 static bus_dma_tag_t 95 plpar_pcibus_get_dma_tag(device_t dev, device_t child) 96 { 97 struct ofw_pcibus_devinfo *dinfo; 98 99 while (device_get_parent(child) != dev) 100 child = device_get_parent(child); 101 102 dinfo = device_get_ivars(child); 103 104 if (dinfo->opd_dma_tag != NULL) 105 return (dinfo->opd_dma_tag); 106 107 bus_dma_tag_create(bus_get_dma_tag(dev), 108 1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, 109 NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, 110 BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->opd_dma_tag); 111 phyp_iommu_set_dma_tag(dev, child, dinfo->opd_dma_tag); 112 113 return (dinfo->opd_dma_tag); 114 } 115 116