1 /* $NetBSD: ofw_pci_subr.c,v 1.1 2021/05/12 23:22:33 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2021 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: ofw_pci_subr.c,v 1.1 2021/05/12 23:22:33 thorpej Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/device.h> 37 #include <sys/endian.h> 38 #include <sys/errno.h> 39 40 #include <dev/pci/pcivar.h> 41 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_pci.h> 44 45 static int 46 ofw_pci_bus_get_child_devhandle(device_t dev, devhandle_t call_handle, void *v) 47 { 48 struct pci_bus_get_child_devhandle_args *args = v; 49 int phandle = devhandle_to_of(call_handle); 50 struct ofw_pci_register opr; 51 int d, f, len; 52 uint32_t phys_hi; 53 54 /* 55 * No need to compare the bus number; we are searching 56 * only direct children of the specified node. Skipping 57 * the bus number comparison allows us to dodge a slight 58 * difference between the OpenFirmware and FDT PCI bindings 59 * as it relates to PCI-PCI bridges. 60 */ 61 62 pci_decompose_tag(args->pc, args->tag, NULL, &d, &f); 63 64 for (phandle = OF_child(phandle); phandle != 0; 65 phandle = OF_peer(phandle)) { 66 len = OF_getprop(phandle, "reg", &opr, sizeof(opr)); 67 if (len < sizeof(opr)) { 68 continue; 69 } 70 71 phys_hi = be32toh(opr.phys_hi); 72 73 if (d != OFW_PCI_PHYS_HI_DEVICE(phys_hi) || 74 f != OFW_PCI_PHYS_HI_FUNCTION(phys_hi)) { 75 continue; 76 } 77 78 /* Found it! */ 79 args->devhandle = devhandle_from_of(phandle); 80 return 0; 81 } 82 83 return ENODEV; 84 } 85 OF_DEVICE_CALL_REGISTER("pci-bus-get-child-devhandle", 86 ofw_pci_bus_get_child_devhandle) 87