1 /*-
2 * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/clock.h>
35 #include <sys/lock.h>
36 #include <sys/mutex.h>
37
38 #include <machine/bus.h>
39
40 #include <powerpc/mpc85xx/ds1553_reg.h>
41
42 static uint8_t ds1553_direct_read(device_t, bus_size_t);
43 static void ds1553_direct_write(device_t, bus_size_t, uint8_t);
44
45 int
46 ds1553_attach(device_t dev)
47 {
48 struct ds1553_softc *sc;
49 uint8_t sec, flags;
50
51 sc = device_get_softc(dev);
52
53 if (mtx_initialized(&sc->sc_mtx) == 0) {
54 device_printf(dev, "%s: mutex not initialized\n", __func__);
55 return (ENXIO);
56 }
57
58 if (sc->sc_read == NULL)
59 sc->sc_read = ds1553_direct_read;
60 if (sc->sc_write == NULL)
61 sc->sc_write = ds1553_direct_write;
62
63 sc->year_offset = POSIX_BASE_YEAR;
64
65 mtx_lock_spin(&sc->sc_mtx);
66
67 /* Turn RTC on if it was not on */
68 sec = (*sc->sc_read)(dev, DS1553_OFF_SECONDS);
69 if (sec & DS1553_BIT_OSC) {
70 sec &= ~(DS1553_BIT_OSC);
71 (*sc->sc_write)(dev, DS1553_OFF_SECONDS, sec);
72 }
73
74 /* Low-battery check */
75 flags = (*sc->sc_read)(dev, DS1553_OFF_FLAGS);
76 if (flags & DS1553_BIT_BLF)
77 device_printf(dev, "voltage-low detected.\n");
78
79 mtx_unlock_spin(&sc->sc_mtx);
80
81 return (0);
82 }
83
84 /*
85 * Get time of day and convert it to a struct timespec.
86 * Return 0 on success, an error number otherwise.
87 */
88 int
89 ds1553_gettime(device_t dev, struct timespec *ts)
90 {
91 struct clocktime ct;
92 struct ds1553_softc *sc;
93 uint8_t control;
94
95 sc = device_get_softc(dev);
96
97 mtx_lock_spin(&sc->sc_mtx);
98
99 control = (*sc->sc_read)(dev, DS1553_OFF_CONTROL) | DS1553_BIT_READ;
100 (*sc->sc_write)(dev, DS1553_OFF_CONTROL, control);
101
102 ct.nsec = 0;
103 ct.sec = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_SECONDS) &
104 DS1553_MASK_SECONDS);
105 ct.min = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_MINUTES) &
106 DS1553_MASK_MINUTES);
107 ct.hour = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_HOURS) &
108 DS1553_MASK_HOUR);
109 ct.dow = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_DAYOFWEEK) &
110 DS1553_MASK_DAYOFWEEK) - 1;
111 ct.day = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_DATE) &
112 DS1553_MASK_DATE);
113 ct.mon = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_MONTH) &
114 DS1553_MASK_MONTH);
115 ct.year = FROMBCD((*sc->sc_read)(dev, DS1553_OFF_YEAR));
116
117 control &= ~DS1553_BIT_READ;
118 (*sc->sc_write)(dev, DS1553_OFF_CONTROL, control);
119
120 ct.year += sc->year_offset;
121
122 mtx_unlock_spin(&sc->sc_mtx);
123
124 return (clock_ct_to_ts(&ct, ts));
125 }
126
127 /*
128 * Set the time of day clock based on the value of the struct timespec arg.
129 * Return 0 on success, an error number otherwise.
130 */
131 int
132 ds1553_settime(device_t dev, struct timespec *ts)
133 {
134 struct clocktime ct;
135 struct ds1553_softc *sc;
136 uint8_t control;
137
138 sc = device_get_softc(dev);
139 bzero(&ct, sizeof(struct clocktime));
140
141 /* Accuracy is only one second. */
142 if (ts->tv_nsec >= 500000000)
143 ts->tv_sec++;
144 ts->tv_nsec = 0;
145 clock_ts_to_ct(ts, &ct);
146
147 ct.year -= sc->year_offset;
148
149 mtx_lock_spin(&sc->sc_mtx);
150
151 /* Halt updates to external registers */
152 control = (*sc->sc_read)(dev, DS1553_OFF_CONTROL) | DS1553_BIT_WRITE;
153 (*sc->sc_write)(dev, DS1553_OFF_CONTROL, control);
154
155 (*sc->sc_write)(dev, DS1553_OFF_SECONDS, TOBCD(ct.sec) &
156 DS1553_MASK_SECONDS);
157 (*sc->sc_write)(dev, DS1553_OFF_MINUTES, TOBCD(ct.min) &
158 DS1553_MASK_MINUTES);
159 (*sc->sc_write)(dev, DS1553_OFF_HOURS, TOBCD(ct.hour) &
160 DS1553_MASK_HOUR);
161 (*sc->sc_write)(dev, DS1553_OFF_DAYOFWEEK, TOBCD(ct.dow + 1) &
162 DS1553_MASK_DAYOFWEEK);
163 (*sc->sc_write)(dev, DS1553_OFF_DATE, TOBCD(ct.day) &
164 DS1553_MASK_DATE);
165 (*sc->sc_write)(dev, DS1553_OFF_MONTH, TOBCD(ct.mon) &
166 DS1553_MASK_MONTH);
167 (*sc->sc_write)(dev, DS1553_OFF_YEAR, TOBCD(ct.year));
168
169 /* Resume updates to external registers */
170 control &= ~DS1553_BIT_WRITE;
171 (*sc->sc_write)(dev, DS1553_OFF_CONTROL, control);
172
173 mtx_unlock_spin(&sc->sc_mtx);
174
175 return (0);
176 }
177
178 static uint8_t
179 ds1553_direct_read(device_t dev, bus_size_t off)
180 {
181 struct ds1553_softc *sc;
182
183 sc = device_get_softc(dev);
184 return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, off));
185 }
186
187 static void
188 ds1553_direct_write(device_t dev, bus_size_t off, uint8_t val)
189 {
190 struct ds1553_softc *sc;
191
192 sc = device_get_softc(dev);
193 bus_space_write_1(sc->sc_bst, sc->sc_bsh, off, val);
194 }
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