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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*-
* Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/time.h>
#include <sys/clock.h>
#include <sys/resource.h>
#include <sys/systm.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/lpc/lpcreg.h>
#include "clock_if.h"
struct lpc_rtc_softc {
device_t lr_dev;
struct resource * lr_mem_res;
bus_space_tag_t lr_bst;
bus_space_handle_t lr_bsh;
};
static int lpc_rtc_probe(device_t dev);
static int lpc_rtc_attach(device_t dev);
static int lpc_rtc_gettime(device_t dev, struct timespec *ts);
static int lpc_rtc_settime(device_t, struct timespec *);
static int
lpc_rtc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "lpc,rtc"))
return (ENXIO);
device_set_desc(dev, "LPC32x0 real time clock");
return (BUS_PROBE_DEFAULT);
}
static int
lpc_rtc_attach(device_t dev)
{
struct lpc_rtc_softc *sc = device_get_softc(dev);
int rid = 0;
sc->lr_dev = dev;
clock_register(dev, 1000000);
sc->lr_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->lr_mem_res) {
device_printf(dev, "cannot allocate memory window\n");
return (ENXIO);
}
sc->lr_bst = rman_get_bustag(sc->lr_mem_res);
sc->lr_bsh = rman_get_bushandle(sc->lr_mem_res);
return (0);
}
static int
lpc_rtc_gettime(device_t dev, struct timespec *ts)
{
struct lpc_rtc_softc *sc = device_get_softc(dev);
ts->tv_sec = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT);
ts->tv_nsec = 0;
return (0);
}
static int
lpc_rtc_settime(device_t dev, struct timespec *ts)
{
struct lpc_rtc_softc *sc = device_get_softc(dev);
uint32_t ctrl;
/* Stop RTC */
ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl | LPC_RTC_CTRL_DISABLE);
/* Write actual value */
bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT, ts->tv_sec);
/* Start RTC */
ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl & ~LPC_RTC_CTRL_DISABLE);
return (0);
}
static device_method_t lpc_rtc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, lpc_rtc_probe),
DEVMETHOD(device_attach, lpc_rtc_attach),
/* Clock interface */
DEVMETHOD(clock_gettime, lpc_rtc_gettime),
DEVMETHOD(clock_settime, lpc_rtc_settime),
{ 0, 0 },
};
static driver_t lpc_rtc_driver = {
"rtc",
lpc_rtc_methods,
sizeof(struct lpc_rtc_softc),
};
static devclass_t lpc_rtc_devclass;
DRIVER_MODULE(rtc, simplebus, lpc_rtc_driver, lpc_rtc_devclass, 0, 0);
|
