1/*	$NetBSD: geodecntr.c,v 1.8 2008/05/10 13:35:56 jmcneill 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 1.8 2008/05/10 13:35:56 jmcneill 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
45struct  geodecntr_softc {
46	struct geode_gcb_softc *sc_gcb_dev;
47	struct timecounter      sc_tc;
48};
49
50static unsigned geode_get_timecount(struct timecounter *);
51
52static int attached = 0;
53
54static int
55geodecntr_match(device_t parent, cfdata_t match, void *aux)
56{
57	return !attached;
58}
59
60/*
61 * attach time counter
62 */
63static void
64geodecntr_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
94static int
95geodecntr_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 */
106static 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
114CFATTACH_DECL_NEW(geodecntr, sizeof(struct geodecntr_softc),
115	      geodecntr_match, geodecntr_attach, geodecntr_detach, NULL);
116
117