1/* $NetBSD: amdpcib_hpet.c,v 1.7 2011/06/15 08:19:43 jruoho 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 1.7 2011/06/15 08:19:43 jruoho 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
49static int	amdpcib_hpet_match(device_t , cfdata_t , void *);
50static void	amdpcib_hpet_attach(device_t, device_t, void *);
51static int	amdpcib_hpet_detach(device_t, int);
52static pcireg_t amdpcib_hpet_addr(struct pci_attach_args *);
53
54CFATTACH_DECL_NEW(amdpcib_hpet, sizeof(struct hpet_softc),
55    amdpcib_hpet_match, amdpcib_hpet_attach, amdpcib_hpet_detach, NULL);
56
57static int
58amdpcib_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
80static void
81amdpcib_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
111static int
112amdpcib_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
130static pcireg_t
131amdpcib_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