1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/libkern.h>
33 #include <sys/module.h>
34 #include <sys/pciio.h>
35
36 #include <dev/ofw/openfirm.h>
37
38 #include <dev/pci/pcivar.h>
39 #include <dev/pci/pcireg.h>
40 #include <dev/pci/pci_private.h>
41
42 #include <machine/bus.h>
43 #include <machine/rtas.h>
44
45 #include <powerpc/ofw/ofw_pcibus.h>
46 #include <powerpc/pseries/plpar_iommu.h>
47
48 #include "pci_if.h"
49 #include "iommu_if.h"
50
51 static int plpar_pcibus_probe(device_t);
52 static bus_dma_tag_t plpar_pcibus_get_dma_tag(device_t dev, device_t child);
53
54 /*
55 * Driver methods.
56 */
57 static device_method_t plpar_pcibus_methods[] = {
58 /* Device interface */
59 DEVMETHOD(device_probe, plpar_pcibus_probe),
60
61 /* IOMMU functions */
62 DEVMETHOD(bus_get_dma_tag, plpar_pcibus_get_dma_tag),
63 DEVMETHOD(iommu_map, phyp_iommu_map),
64 DEVMETHOD(iommu_unmap, phyp_iommu_unmap),
65
66 DEVMETHOD_END
67 };
68
69 DEFINE_CLASS_1(pci, plpar_pcibus_driver, plpar_pcibus_methods,
70 sizeof(struct pci_softc), ofw_pcibus_driver);
71 DRIVER_MODULE(plpar_pcibus, pcib, plpar_pcibus_driver, 0, 0);
72
73 static int
plpar_pcibus_probe(device_t dev)74 plpar_pcibus_probe(device_t dev)
75 {
76 phandle_t rtas;
77
78 if (ofw_bus_get_node(dev) == -1 || !rtas_exists())
79 return (ENXIO);
80
81 rtas = OF_finddevice("/rtas");
82 if (!OF_hasprop(rtas, "ibm,hypertas-functions"))
83 return (ENXIO);
84
85 device_set_desc(dev, "POWER Hypervisor PCI bus");
86
87 return (BUS_PROBE_SPECIFIC);
88 }
89
90 static bus_dma_tag_t
plpar_pcibus_get_dma_tag(device_t dev,device_t child)91 plpar_pcibus_get_dma_tag(device_t dev, device_t child)
92 {
93 struct ofw_pcibus_devinfo *dinfo;
94
95 while (device_get_parent(child) != dev)
96 child = device_get_parent(child);
97
98 dinfo = device_get_ivars(child);
99
100 if (dinfo->opd_dma_tag != NULL)
101 return (dinfo->opd_dma_tag);
102
103 bus_dma_tag_create(bus_get_dma_tag(dev),
104 1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
105 NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED,
106 BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->opd_dma_tag);
107 phyp_iommu_set_dma_tag(dev, child, dinfo->opd_dma_tag);
108
109 return (dinfo->opd_dma_tag);
110 }
111