1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* $OpenBSD: gfrtc.c,v 1.3 2022/10/17 19:09:46 kettenis Exp $ */
/*
* Copyright (c) 2021 Jonathan Gray <jsg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Google Goldfish virtual real-time clock described in
* https://android.googlesource.com/platform/external/qemu/+/master/docs/GOLDFISH-VIRTUAL-HARDWARE.TXT
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/clock_subr.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#define TIME_LOW 0x00
#define TIME_HIGH 0x04
#define ALARM_LOW 0x0c
#define CLEAR_INTERRUPT 0x10
struct gfrtc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct todr_chip_handle sc_todr;
};
int gfrtc_match(struct device *, void *, void *);
void gfrtc_attach(struct device *, struct device *, void *);
int gfrtc_gettime(struct todr_chip_handle *, struct timeval *);
int gfrtc_settime(struct todr_chip_handle *, struct timeval *);
const struct cfattach gfrtc_ca = {
sizeof(struct gfrtc_softc), gfrtc_match, gfrtc_attach
};
struct cfdriver gfrtc_cd = {
NULL, "gfrtc", DV_DULL
};
int
gfrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
{
struct gfrtc_softc *sc = handle->cookie;
uint64_t tl, th;
tl = bus_space_read_4(sc->sc_iot, sc->sc_ioh, TIME_LOW);
th = bus_space_read_4(sc->sc_iot, sc->sc_ioh, TIME_HIGH);
NSEC_TO_TIMEVAL((th << 32) | tl, tv);
return 0;
}
int
gfrtc_settime(todr_chip_handle_t handle, struct timeval *tv)
{
struct gfrtc_softc *sc = handle->cookie;
uint64_t ns;
ns = TIMEVAL_TO_NSEC(tv);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, TIME_HIGH, ns >> 32);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, TIME_LOW, ns);
return 0;
}
int
gfrtc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "google,goldfish-rtc");
}
void
gfrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct fdt_attach_args *faa = aux;
struct gfrtc_softc *sc = (struct gfrtc_softc *) self;
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": failed to map mem space\n");
return;
}
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = gfrtc_gettime;
sc->sc_todr.todr_settime = gfrtc_settime;
sc->sc_todr.todr_quality = 1000;
todr_attach(&sc->sc_todr);
printf("\n");
}
|
