acpi_timer.c revision 69458 
1/*-
2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *	$FreeBSD: head/sys/dev/acpica/acpi_timer.c 69458 2000-12-01 10:18:57Z msmith $
28 */
29
30#include "opt_acpi.h"
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/bus.h>
34
35#include "acpi.h"
36
37#include <dev/acpica/acpivar.h>
38
39#define ACPITIMER_MAGIC 0x524d4954	/* "TIMR" */
40
41struct acpi_timer_softc {
42    device_t	tm_dev;
43};
44
45static void	acpi_timer_identify(driver_t *driver, device_t parent);
46static int	acpi_timer_probe(device_t dev);
47static int	acpi_timer_attach(device_t dev);
48
49static device_method_t acpi_timer_methods[] = {
50    /* Device interface */
51    DEVMETHOD(device_identify,	acpi_timer_identify),
52    DEVMETHOD(device_probe,	acpi_timer_probe),
53    DEVMETHOD(device_attach,	acpi_timer_attach),
54
55    {0, 0}
56};
57
58static driver_t acpi_timer_driver = {
59    "acpi_timer",
60    acpi_timer_methods,
61    sizeof(struct acpi_timer_softc),
62};
63
64devclass_t acpi_timer_devclass;
65DRIVER_MODULE(acpi_timer, acpi, acpi_timer_driver, acpi_timer_devclass, 0, 0);
66
67static void
68acpi_timer_identify(driver_t *driver, device_t parent)
69{
70    static FADT_DESCRIPTOR_REV1	fadt;
71    ACPI_BUFFER			buf;
72    ACPI_STATUS			status;
73    device_t			dev;
74    char			desc[40];
75
76    buf.Pointer = &fadt;
77    buf.Length = sizeof(fadt);
78    if ((status = AcpiGetTable(ACPI_TABLE_FADT, 1, &buf)) != AE_OK) {
79	device_printf(parent, "can't locate FADT - %s\n", acpi_strerror(status));
80	return;
81    }
82    if (buf.Length != sizeof(fadt)) {
83	device_printf(parent, "invalid FADT\n");
84	return;
85    }
86
87    if ((dev = BUS_ADD_CHILD(parent, 0, "acpi_timer", 0)) == NULL) {
88	device_printf(parent, "could not add acpi_timer0\n");
89	return;
90    }
91    if (acpi_set_magic(dev, ACPITIMER_MAGIC)) {
92	device_printf(dev, "could not set magic\n");
93	return;
94    }
95
96    sprintf(desc, "%d-bit timer at 3.579545MHz", fadt.TmrValExt ? 32 : 24);
97    device_set_desc_copy(dev, desc);
98}
99
100static int
101acpi_timer_probe(device_t dev)
102{
103    if (acpi_get_magic(dev) == ACPITIMER_MAGIC)
104	return(0);
105    return(ENXIO);
106}
107
108static int
109acpi_timer_attach(device_t dev)
110{
111    struct acpi_timer_softc		*sc;
112
113    sc = device_get_softc(dev);
114    sc->tm_dev = dev;
115
116    return(0);
117}
118