1 /* $NetBSD: geodecntr.c,v 1.9 2011/07/01 17:37:26 dyoung Exp $ */
2
3 /*-
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank Kardel inspired from the patches to FreeBSD by Poul Henning Kamp
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: geodecntr.c,v 1.9 2011/07/01 17:37:26 dyoung Exp $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/device.h>
39 #include <machine/cpu.h>
40 #include <sys/timetc.h>
41 #include <sys/bus.h>
42 #include <arch/i386/pci/geodevar.h>
43 #include <arch/i386/pci/geodereg.h>
44
45 struct geodecntr_softc {
46 struct geode_gcb_softc *sc_gcb_dev;
47 struct timecounter sc_tc;
48 };
49
50 static unsigned geode_get_timecount(struct timecounter *);
51
52 static int attached = 0;
53
54 static int
geodecntr_match(device_t parent,cfdata_t match,void * aux)55 geodecntr_match(device_t parent, cfdata_t match, void *aux)
56 {
57 return !attached;
58 }
59
60 /*
61 * attach time counter
62 */
63 static void
geodecntr_attach(device_t parent,device_t self,void * aux)64 geodecntr_attach(device_t parent, device_t self, void *aux)
65 {
66 struct geodecntr_softc *sc = device_private(self);
67
68 aprint_naive("\n");
69 aprint_normal(": AMD Geode SC1100 27MHz Counter\n");
70
71 sc->sc_gcb_dev = device_private(parent);
72
73 /*
74 * select 27MHz, no powerdown, no interrupt
75 */
76 bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
77 SC1100_GCB_TMCNFG_B, SC1100_TMCNFG_TMCLKSEL);
78
79 memset(&sc->sc_tc, 0, sizeof(sc->sc_tc));
80
81 sc->sc_tc.tc_get_timecount = geode_get_timecount;
82 sc->sc_tc.tc_poll_pps = NULL;
83 sc->sc_tc.tc_counter_mask = 0xffffffff;
84 sc->sc_tc.tc_frequency = 27000000;
85 sc->sc_tc.tc_name = "geodecounter";
86 sc->sc_tc.tc_priv = sc;
87 sc->sc_tc.tc_quality = 1000;
88
89 tc_init(&sc->sc_tc);
90
91 attached = 1;
92 }
93
94 static int
geodecntr_detach(device_t self,int flags)95 geodecntr_detach(device_t self, int flags)
96 {
97 struct geodecntr_softc *sc = device_private(self);
98
99 attached = 0;
100 return tc_detach(&sc->sc_tc);
101 }
102
103 /*
104 * read counter
105 */
geode_get_timecount(struct timecounter * tc)106 static unsigned geode_get_timecount(struct timecounter *tc)
107 {
108 struct geodecntr_softc *sc = (struct geodecntr_softc *)tc->tc_priv;
109
110 return bus_space_read_4(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
111 SC1100_GCB_TMVALUE_L);
112 }
113
114 CFATTACH_DECL_NEW(geodecntr, sizeof(struct geodecntr_softc),
115 geodecntr_match, geodecntr_attach, geodecntr_detach, NULL);
116
117