plpar_pcibus.c revision 331722 
1/*-
2 * Copyright (c) 2011 Nathan Whitehorn
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/powerpc/pseries/plpar_pcibus.c 331722 2018-03-29 02:50:57Z eadler $");
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/libkern.h>
34#include <sys/module.h>
35#include <sys/pciio.h>
36
37#include <dev/ofw/openfirm.h>
38
39#include <dev/pci/pcivar.h>
40#include <dev/pci/pcireg.h>
41#include <dev/pci/pci_private.h>
42
43#include <machine/bus.h>
44#include <machine/rtas.h>
45
46#include <powerpc/ofw/ofw_pcibus.h>
47#include <powerpc/pseries/plpar_iommu.h>
48
49#include "pci_if.h"
50#include "iommu_if.h"
51
52static int		plpar_pcibus_probe(device_t);
53static bus_dma_tag_t	plpar_pcibus_get_dma_tag(device_t dev, device_t child);
54
55/*
56 * Driver methods.
57 */
58static device_method_t	plpar_pcibus_methods[] = {
59	/* Device interface */
60	DEVMETHOD(device_probe,		plpar_pcibus_probe),
61
62	/* IOMMU functions */
63	DEVMETHOD(bus_get_dma_tag,	plpar_pcibus_get_dma_tag),
64	DEVMETHOD(iommu_map,		phyp_iommu_map),
65	DEVMETHOD(iommu_unmap,		phyp_iommu_unmap),
66
67	DEVMETHOD_END
68};
69
70static devclass_t pci_devclass;
71DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods,
72    sizeof(struct pci_softc), ofw_pcibus_driver);
73DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, pci_devclass, 0, 0);
74
75static int
76plpar_pcibus_probe(device_t dev)
77{
78	phandle_t rtas;
79
80	if (ofw_bus_get_node(dev) == -1 || !rtas_exists())
81		return (ENXIO);
82
83	rtas = OF_finddevice("/rtas");
84	if (!OF_hasprop(rtas, "ibm,hypertas-functions"))
85		return (ENXIO);
86
87	device_set_desc(dev, "POWER Hypervisor PCI bus");
88
89	return (BUS_PROBE_SPECIFIC);
90}
91
92static bus_dma_tag_t
93plpar_pcibus_get_dma_tag(device_t dev, device_t child)
94{
95	struct ofw_pcibus_devinfo *dinfo;
96
97	while (device_get_parent(child) != dev)
98		child = device_get_parent(child);
99
100	dinfo = device_get_ivars(child);
101
102	if (dinfo->opd_dma_tag != NULL)
103		return (dinfo->opd_dma_tag);
104
105	bus_dma_tag_create(bus_get_dma_tag(dev),
106	    1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
107	    NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED,
108	    BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->opd_dma_tag);
109	phyp_iommu_set_dma_tag(dev, child, dinfo->opd_dma_tag);
110
111	return (dinfo->opd_dma_tag);
112}
113
114