1 /* $NetBSD: intersil7170.c,v 1.8 2006/10/04 15:04:43 tsutsui Exp $ */
2 /*-
3 * Copyright (c) 2000 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Paul Kranenburg.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the NetBSD
20 * Foundation, Inc. and its contributors.
21 * 4. Neither the name of The NetBSD Foundation nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Intersil 7170 time-of-day chip subroutines.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: intersil7170.c,v 1.8 2006/10/04 15:04:43 tsutsui Exp $");
44
45 #include <sys/param.h>
46 #include <sys/malloc.h>
47 #include <sys/systm.h>
48 #include <sys/device.h>
49 #include <sys/errno.h>
50
51 #include <machine/bus.h>
52 #include <dev/clock_subr.h>
53 #include <dev/ic/intersil7170reg.h>
54 #include <dev/ic/intersil7170var.h>
55
56 int intersil7170_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
57 int intersil7170_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
58
59 void
60 intersil7170_attach(struct intersil7170_softc *sc)
61 {
62 todr_chip_handle_t handle;
63
64 printf(": intersil7170");
65
66 handle = &sc->sc_handle;
67
68 handle->cookie = sc;
69 handle->todr_gettime = NULL;
70 handle->todr_settime = NULL;
71 handle->todr_gettime_ymdhms = intersil7170_gettime_ymdhms;
72 handle->todr_settime_ymdhms = intersil7170_settime_ymdhms;
73 handle->todr_setwen = NULL;
74 }
75
76 /*
77 * Set up the system's time, given a `reasonable' time value.
78 */
79 int
80 intersil7170_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
81 {
82 struct intersil7170_softc *sc = handle->cookie;
83 bus_space_tag_t bt = sc->sc_bst;
84 bus_space_handle_t bh = sc->sc_bsh;
85 uint8_t cmd;
86 int year;
87 int s;
88
89 /* No interrupts while we're fiddling with the chip */
90 s = splhigh();
91
92 /* Enable read (stop time) */
93 cmd = INTERSIL_COMMAND(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
94 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
95
96 /* The order of reading out the clock elements is important */
97 (void)bus_space_read_1(bt, bh, INTERSIL_ICSEC); /* not used */
98 dt->dt_hour = bus_space_read_1(bt, bh, INTERSIL_IHOUR);
99 dt->dt_min = bus_space_read_1(bt, bh, INTERSIL_IMIN);
100 dt->dt_sec = bus_space_read_1(bt, bh, INTERSIL_ISEC);
101 dt->dt_mon = bus_space_read_1(bt, bh, INTERSIL_IMON);
102 dt->dt_day = bus_space_read_1(bt, bh, INTERSIL_IDAY);
103 year = bus_space_read_1(bt, bh, INTERSIL_IYEAR);
104 dt->dt_wday = bus_space_read_1(bt, bh, INTERSIL_IDOW);
105
106 /* Done writing (time wears on) */
107 cmd = INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
108 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
109 splx(s);
110
111 year += sc->sc_year0;
112 if (year < POSIX_BASE_YEAR &&
113 (sc->sc_flag & INTERSIL7170_NO_CENT_ADJUST) == 0)
114 year += 100;
115
116 dt->dt_year = year;
117
118 return 0;
119 }
120
121 /*
122 * Reset the clock based on the current time.
123 */
124 int
125 intersil7170_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
126 {
127 struct intersil7170_softc *sc = handle->cookie;
128 bus_space_tag_t bt = sc->sc_bst;
129 bus_space_handle_t bh = sc->sc_bsh;
130 uint8_t cmd;
131 int year;
132 int s;
133
134 year = dt->dt_year - sc->sc_year0;
135 if (year > 99 && (sc->sc_flag & INTERSIL7170_NO_CENT_ADJUST) == 0)
136 year -= 100;
137
138 /* No interrupts while we're fiddling with the chip */
139 s = splhigh();
140
141 /* Enable write (stop time) */
142 cmd = INTERSIL_COMMAND(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
143 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
144
145 /* The order of reading writing the clock elements is important */
146 bus_space_write_1(bt, bh, INTERSIL_ICSEC, 0);
147 bus_space_write_1(bt, bh, INTERSIL_IHOUR, dt->dt_hour);
148 bus_space_write_1(bt, bh, INTERSIL_IMIN, dt->dt_min);
149 bus_space_write_1(bt, bh, INTERSIL_ISEC, dt->dt_sec);
150 bus_space_write_1(bt, bh, INTERSIL_IMON, dt->dt_mon);
151 bus_space_write_1(bt, bh, INTERSIL_IDAY, dt->dt_day);
152 bus_space_write_1(bt, bh, INTERSIL_IYEAR, year);
153 bus_space_write_1(bt, bh, INTERSIL_IDOW, dt->dt_wday);
154
155 /* Done writing (time wears on) */
156 cmd = INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
157 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
158 splx(s);
159
160 return 0;
161 }
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