ofw_pci_subr.c revision 1.2 
1/*	$NetBSD: ofw_pci_subr.c,v 1.2 2021/09/15 17:33:08 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 1.2 2021/09/15 17:33:08 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#include <dev/pci/pci_calls.h>
42
43#include <dev/ofw/openfirm.h>
44#include <dev/ofw/ofw_pci.h>
45
46static int
47ofw_pci_bus_get_child_devhandle(device_t dev, devhandle_t call_handle, void *v)
48{
49	struct pci_bus_get_child_devhandle_args *args = v;
50	int phandle = devhandle_to_of(call_handle);
51	struct ofw_pci_register opr;
52	int d, f, len;
53	uint32_t phys_hi;
54
55	/*
56	 * No need to compare the bus number; we are searching
57	 * only direct children of the specified node.  Skipping
58	 * the bus number comparison allows us to dodge a slight
59	 * difference between the OpenFirmware and FDT PCI bindings
60	 * as it relates to PCI-PCI bridges.
61	 */
62
63	pci_decompose_tag(args->pc, args->tag, NULL, &d, &f);
64
65	for (phandle = OF_child(phandle); phandle != 0;
66	     phandle = OF_peer(phandle)) {
67		len = OF_getprop(phandle, "reg", &opr, sizeof(opr));
68		if (len < sizeof(opr)) {
69			continue;
70		}
71
72		phys_hi = be32toh(opr.phys_hi);
73
74		if (d != OFW_PCI_PHYS_HI_DEVICE(phys_hi) ||
75		    f != OFW_PCI_PHYS_HI_FUNCTION(phys_hi)) {
76			continue;
77		}
78
79		/* Found it! */
80		args->devhandle = devhandle_from_of(phandle);
81		return 0;
82	}
83
84	return ENODEV;
85}
86OF_DEVICE_CALL_REGISTER(PCI_BUS_GET_CHILD_DEVHANDLE_STR,
87			ofw_pci_bus_get_child_devhandle)
88