1 /* $NetBSD: amdpcib_hpet.c,v 1.8 2011/07/01 18:22:08 dyoung Exp $ */
2
3 /*
4 * Copyright (c) 2006 Nicolas Joly
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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: amdpcib_hpet.c,v 1.8 2011/07/01 18:22:08 dyoung Exp $");
33
34 #include <sys/systm.h>
35 #include <sys/device.h>
36
37 #include <sys/time.h>
38 #include <sys/timetc.h>
39
40 #include <sys/bus.h>
41
42 #include <dev/pci/pcivar.h>
43 #include <dev/pci/pcireg.h>
44 #include <dev/pci/pcidevs.h>
45
46 #include <dev/ic/hpetreg.h>
47 #include <dev/ic/hpetvar.h>
48
49 static int amdpcib_hpet_match(device_t , cfdata_t , void *);
50 static void amdpcib_hpet_attach(device_t, device_t, void *);
51 static int amdpcib_hpet_detach(device_t, int);
52 static pcireg_t amdpcib_hpet_addr(struct pci_attach_args *);
53
54 CFATTACH_DECL_NEW(amdpcib_hpet, sizeof(struct hpet_softc),
55 amdpcib_hpet_match, amdpcib_hpet_attach, amdpcib_hpet_detach, NULL);
56
57 static int
amdpcib_hpet_match(device_t parent,cfdata_t match,void * aux)58 amdpcib_hpet_match(device_t parent, cfdata_t match, void *aux)
59 {
60 struct pci_attach_args *pa = aux;
61 bus_space_handle_t bh;
62 bus_space_tag_t bt;
63 pcireg_t addr;
64
65 addr = amdpcib_hpet_addr(pa);
66
67 if (addr == 0)
68 return 0;
69
70 bt = pa->pa_memt;
71
72 if (bus_space_map(bt, addr, HPET_WINDOW_SIZE, 0, &bh) != 0)
73 return 0;
74
75 bus_space_unmap(bt, bh, HPET_WINDOW_SIZE);
76
77 return 1;
78 }
79
80 static void
amdpcib_hpet_attach(device_t parent,device_t self,void * aux)81 amdpcib_hpet_attach(device_t parent, device_t self, void *aux)
82 {
83 struct hpet_softc *sc = device_private(self);
84 struct pci_attach_args *pa = aux;
85 pcireg_t addr;
86
87 sc->sc_mapped = false;
88 addr = amdpcib_hpet_addr(pa);
89
90 if (addr == 0) {
91 aprint_error(": failed to get address\n");
92 return;
93 }
94
95 sc->sc_memt = pa->pa_memt;
96 sc->sc_mems = HPET_WINDOW_SIZE;
97
98 if (bus_space_map(sc->sc_memt, addr, sc->sc_mems, 0, &sc->sc_memh)) {
99 aprint_error(": failed to map mem space\n");
100 return;
101 }
102
103 aprint_naive("\n");
104 aprint_normal(": high precision event timer (mem 0x%08x-0x%08x)\n",
105 addr, addr + HPET_WINDOW_SIZE);
106
107 sc->sc_mapped = true;
108 hpet_attach_subr(self);
109 }
110
111 static int
amdpcib_hpet_detach(device_t self,int flags)112 amdpcib_hpet_detach(device_t self, int flags)
113 {
114 struct hpet_softc *sc = device_private(self);
115 int rv;
116
117 if (sc->sc_mapped != true)
118 return 0;
119
120 rv = hpet_detach(self, flags);
121
122 if (rv != 0)
123 return rv;
124
125 bus_space_unmap(sc->sc_memt, sc->sc_memh, sc->sc_mems);
126
127 return 0;
128 }
129
130 static pcireg_t
amdpcib_hpet_addr(struct pci_attach_args * pa)131 amdpcib_hpet_addr(struct pci_attach_args *pa)
132 {
133 pcireg_t conf;
134
135 conf = pci_conf_read(pa->pa_pc, pa->pa_tag, 0xa0);
136
137 if ((conf & 1) == 0)
138 return 0;
139
140 return conf & 0xfffffc00;
141 }
142