Annotation of sys/dev/acpi/acpihpet.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: acpihpet.c,v 1.4 2007/02/20 23:54:46 marco Exp $ */
2: /*
3: * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: #include <sys/param.h>
19: #include <sys/systm.h>
20: #include <sys/device.h>
21: #include <sys/malloc.h>
22: #ifdef __HAVE_TIMECOUNTER
23: #include <sys/timetc.h>
24: #endif
25:
26: #include <machine/bus.h>
27:
28: #include <dev/acpi/acpireg.h>
29: #include <dev/acpi/acpivar.h>
30: #include <dev/acpi/acpidev.h>
31:
32: int acpihpet_match(struct device *, void *, void *);
33: void acpihpet_attach(struct device *, struct device *, void *);
34:
35: #ifdef __HAVE_TIMECOUNTER
36: u_int acpihpet_gettime(struct timecounter *tc);
37:
38: static struct timecounter hpet_timecounter = {
39: acpihpet_gettime, /* get_timecount */
40: 0, /* no poll_pps */
41: 0xffffffff, /* counter_mask (24 bits) */
42: 0, /* frequency */
43: 0, /* name */
44: 1000 /* quality */
45: };
46: #endif
47:
48: struct acpihpet_softc {
49: struct device sc_dev;
50:
51: bus_space_tag_t sc_iot;
52: bus_space_handle_t sc_ioh;
53: };
54:
55: struct cfattach acpihpet_ca = {
56: sizeof(struct acpihpet_softc), acpihpet_match, acpihpet_attach
57: };
58:
59: struct cfdriver acpihpet_cd = {
60: NULL, "acpihpet", DV_DULL
61: };
62:
63: int
64: acpihpet_match(struct device *parent, void *match, void *aux)
65: {
66: struct acpi_attach_args *aaa = aux;
67: struct acpi_table_header *hdr;
68:
69: /*
70: * If we do not have a table, it is not us
71: */
72: if (aaa->aaa_table == NULL)
73: return (0);
74:
75: /*
76: * If it is an HPET table, we can attach
77: */
78: hdr = (struct acpi_table_header *)aaa->aaa_table;
79: if (memcmp(hdr->signature, HPET_SIG, sizeof(HPET_SIG) - 1) != 0)
80: return (0);
81:
82: return (1);
83: }
84:
85: void
86: acpihpet_attach(struct device *parent, struct device *self, void *aux)
87: {
88: struct acpihpet_softc *sc = (struct acpihpet_softc *) self;
89: struct acpi_softc *psc = (struct acpi_softc *)parent;
90: struct acpi_attach_args *aaa = aux;
91: struct acpi_hpet *hpet = (struct acpi_hpet *)aaa->aaa_table;
92: u_int64_t period, freq; /* timer period in femtoseconds (10^-15) */
93:
94: if (acpi_map_address(psc, &hpet->base_address, 0, HPET_REG_SIZE,
95: &sc->sc_ioh, &sc->sc_iot)) {
96: printf(": can't map i/o space\n");
97: return;
98: }
99:
100: period = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
101: HPET_CAPABILITIES + sizeof(u_int32_t));
102: freq = 1000000000000000ull / period;
103: printf(": %lld Hz\n", freq);
104:
105: #ifdef __HAVE_TIMECOUNTER
106: hpet_timecounter.tc_frequency = (u_int32_t)freq;
107: hpet_timecounter.tc_priv = sc;
108: hpet_timecounter.tc_name = sc->sc_dev.dv_xname;
109: bus_space_write_4(sc->sc_iot, sc->sc_ioh, HPET_CONFIGURATION, 1);
110: tc_init(&hpet_timecounter);
111: #endif
112: }
113:
114: #ifdef __HAVE_TIMECOUNTER
115: u_int
116: acpihpet_gettime(struct timecounter *tc)
117: {
118: struct acpihpet_softc *sc = tc->tc_priv;
119:
120: return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER));
121: }
122: #endif
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