1 /* $OpenBSD: ppb.c,v 1.19 2007/05/21 22:10:45 kettenis Exp $ */
2 /* $NetBSD: ppb.c,v 1.16 1997/06/06 23:48:05 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 1996 Christopher G. Demetriou. 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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Christopher G. Demetriou
18 * for the NetBSD Project.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/device.h>
38
39 #include <dev/pci/pcireg.h>
40 #include <dev/pci/pcivar.h>
41 #include <dev/pci/pcidevs.h>
42 #include <dev/pci/ppbreg.h>
43
44 struct ppb_softc {
45 struct device sc_dev; /* generic device glue */
46 pci_chipset_tag_t sc_pc; /* our PCI chipset... */
47 pcitag_t sc_tag; /* ...and tag. */
48 pci_intr_handle_t sc_ih[4];
49 };
50
51 int ppbmatch(struct device *, void *, void *);
52 void ppbattach(struct device *, struct device *, void *);
53
54 struct cfattach ppb_ca = {
55 sizeof(struct ppb_softc), ppbmatch, ppbattach
56 };
57
58 struct cfdriver ppb_cd = {
59 NULL, "ppb", DV_DULL
60 };
61
62 int ppbprint(void *, const char *pnp);
63
64 int
65 ppbmatch(struct device *parent, void *match, void *aux)
66 {
67 struct pci_attach_args *pa = aux;
68
69 /*
70 * This device is mislabeled. It is not a PCI bridge.
71 */
72 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_VIATECH &&
73 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_VIATECH_VT82C586_PWR)
74 return (0);
75 /*
76 * Check the ID register to see that it's a PCI bridge.
77 * If it is, we assume that we can deal with it; it _should_
78 * work in a standardized way...
79 */
80 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
81 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
82 return (1);
83
84 return (0);
85 }
86
87 void
88 ppbattach(struct device *parent, struct device *self, void *aux)
89 {
90 struct ppb_softc *sc = (void *) self;
91 struct pci_attach_args *pa = aux;
92 pci_chipset_tag_t pc = pa->pa_pc;
93 struct pcibus_attach_args pba;
94 pcireg_t busdata;
95 int pin;
96
97 printf("\n");
98
99 sc->sc_pc = pc;
100 sc->sc_tag = pa->pa_tag;
101
102 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
103
104 if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
105 printf("%s: not configured by system firmware\n",
106 self->dv_xname);
107 return;
108 }
109
110 for (pin = PCI_INTERRUPT_PIN_A; pin <= PCI_INTERRUPT_PIN_D; pin++) {
111 pa->pa_intrpin = pa->pa_rawintrpin = pin;
112 pa->pa_intrline = 0;
113 pci_intr_map(pa, &sc->sc_ih[pin - PCI_INTERRUPT_PIN_A]);
114 }
115
116 #if 0
117 /*
118 * XXX can't do this, because we're not given our bus number
119 * (we shouldn't need it), and because we've no way to
120 * decompose our tag.
121 */
122 /* sanity check. */
123 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
124 panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
125 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
126 #endif
127
128 /*
129 * Attach the PCI bus that hangs off of it.
130 *
131 * XXX Don't pass-through Memory Read Multiple. Should we?
132 * XXX Consult the spec...
133 */
134 pba.pba_busname = "pci";
135 pba.pba_iot = pa->pa_iot;
136 pba.pba_memt = pa->pa_memt;
137 pba.pba_dmat = pa->pa_dmat;
138 pba.pba_pc = pc;
139 #if 0
140 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
141 #endif
142 pba.pba_domain = pa->pa_domain;
143 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
144 pba.pba_bridgeih = sc->sc_ih;
145 pba.pba_bridgetag = &sc->sc_tag;
146 pba.pba_intrswiz = pa->pa_intrswiz;
147 pba.pba_intrtag = pa->pa_intrtag;
148
149 config_found(self, &pba, ppbprint);
150 }
151
152 int
153 ppbprint(void *aux, const char *pnp)
154 {
155 struct pcibus_attach_args *pba = aux;
156
157 /* only PCIs can attach to PPBs; easy. */
158 if (pnp)
159 printf("pci at %s", pnp);
160 printf(" bus %d", pba->pba_bus);
161 return (UNCONF);
162 }