plpar_pcibus.c revision 330897 
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: stable/11/sys/powerpc/pseries/plpar_pcibus.c 330897 2018-03-14 03:19:51Z eadler $");
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
54static int		plpar_pcibus_probe(device_t);
55static bus_dma_tag_t	plpar_pcibus_get_dma_tag(device_t dev, device_t child);
56
57/*
58 * Driver methods.
59 */
60static 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
72static devclass_t pci_devclass;
73DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods,
74    sizeof(struct pci_softc), ofw_pcibus_driver);
75DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, pci_devclass, 0, 0);
76
77static int
78plpar_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
94static bus_dma_tag_t
95plpar_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