88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/* $NetBSD: ofw_pci_subr.c,v 1.3 2022/01/22 11:49:18 thorpej Exp $ */
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/*-
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* Copyright (c) 2021 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ofw_pci_subr.c,v 1.3 2022/01/22 11:49:18 thorpej Exp $");
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#include <sys/types.h>
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#include <sys/device.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pci_calls.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_pci.h>
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static int
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ofw_pci_bus_get_child_devhandle(device_t dev, devhandle_t call_handle, void *v)
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{
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struct pci_bus_get_child_devhandle_args *args = v;
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int phandle = devhandle_to_of(call_handle);
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struct ofw_pci_register opr;
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int d, f, len;
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uint32_t phys_hi;
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/*
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* No need to compare the bus number; we are searching
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* only direct children of the specified node. Skipping
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* the bus number comparison allows us to dodge a slight
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* difference between the OpenFirmware and FDT PCI bindings
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* as it relates to PCI-PCI bridges.
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*/
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pci_decompose_tag(args->pc, args->tag, NULL, &d, &f);
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for (phandle = OF_child(phandle); phandle != 0;
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phandle = OF_peer(phandle)) {
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len = OF_getprop(phandle, "reg", &opr, sizeof(opr));
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if (len < sizeof(opr)) {
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continue;
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}
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phys_hi = be32toh(opr.phys_hi);
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if (d != OFW_PCI_PHYS_HI_DEVICE(phys_hi) ||
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f != OFW_PCI_PHYS_HI_FUNCTION(phys_hi)) {
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continue;
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}
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/* Found it! */
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args->devhandle = devhandle_from_of(call_handle, phandle);
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return 0;
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}
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return ENODEV;
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}
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OF_DEVICE_CALL_REGISTER(PCI_BUS_GET_CHILD_DEVHANDLE_STR,
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ofw_pci_bus_get_child_devhandle)
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