2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
31 * $NetBSD: mk48txx.c,v 1.25 2008/04/28 20:23:50 martin Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 * Mostek MK48T02, MK48T08, MK48T18, MK48T37 and MK48T59 time-of-day chip
42 #include <sys/param.h>
43 #include <sys/systm.h>
45 #include <sys/clock.h>
46 #include <sys/eventhandler.h>
48 #include <sys/mutex.h>
50 #include <sys/watchdog.h>
52 #include <machine/bus.h>
54 #include <dev/mk48txx/mk48txxreg.h>
55 #include <dev/mk48txx/mk48txxvar.h>
59 static uint8_t mk48txx_def_nvrd(device_t dev, int off);
60 static void mk48txx_def_nvwr(device_t dev, int off, uint8_t v);
61 static void mk48txx_watchdog(void *arg, u_int cmd, int *error);
68 #define MK48TXX_EXT_REGISTERS 1 /* Has extended register set. */
69 } mk48txx_models[] = {
70 { "mk48t02", MK48T02_CLKSZ, MK48T02_CLKOFF, 0 },
71 { "mk48t08", MK48T08_CLKSZ, MK48T08_CLKOFF, 0 },
72 { "mk48t18", MK48T18_CLKSZ, MK48T18_CLKOFF, 0 },
73 { "mk48t37", MK48T37_CLKSZ, MK48T37_CLKOFF, MK48TXX_EXT_REGISTERS },
74 { "mk48t59", MK48T59_CLKSZ, MK48T59_CLKOFF, MK48TXX_EXT_REGISTERS },
78 mk48txx_attach(device_t dev)
80 struct mk48txx_softc *sc;
84 sc = device_get_softc(dev);
86 if (mtx_initialized(&sc->sc_mtx) == 0) {
87 device_printf(dev, "%s: mutex not initialized\n", __func__);
91 device_printf(dev, "model %s", sc->sc_model);
92 i = sizeof(mk48txx_models) / sizeof(mk48txx_models[0]);
94 if (strcmp(sc->sc_model, mk48txx_models[i].name) == 0) {
99 device_printf(dev, " (unsupported)\n");
103 sc->sc_nvramsz = mk48txx_models[i].nvramsz;
104 sc->sc_clkoffset = mk48txx_models[i].clkoff;
106 if (sc->sc_nvrd == NULL)
107 sc->sc_nvrd = mk48txx_def_nvrd;
108 if (sc->sc_nvwr == NULL)
109 sc->sc_nvwr = mk48txx_def_nvwr;
111 if (mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS) {
112 mtx_lock(&sc->sc_mtx);
113 if ((*sc->sc_nvrd)(dev, sc->sc_clkoffset + MK48TXX_FLAGS) &
115 mtx_unlock(&sc->sc_mtx);
116 device_printf(dev, "%s: battery low\n", __func__);
119 mtx_unlock(&sc->sc_mtx);
122 if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) {
124 * Use MK48TXX_WDAY_CB instead of manually adjusting the
127 if (!(mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS)) {
128 device_printf(dev, "%s: no century bit\n", __func__);
131 mtx_lock(&sc->sc_mtx);
132 wday = (*sc->sc_nvrd)
133 (dev, sc->sc_clkoffset + MK48TXX_IWDAY);
134 wday |= MK48TXX_WDAY_CEB;
136 (dev, sc->sc_clkoffset + MK48TXX_IWDAY, wday);
137 mtx_unlock(&sc->sc_mtx);
141 clock_register(dev, 1000000); /* 1 second resolution */
143 if ((sc->sc_flag & MK48TXX_WDOG_REGISTER) &&
144 (mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS)) {
145 sc->sc_wet = EVENTHANDLER_REGISTER(watchdog_list,
146 mk48txx_watchdog, dev, 0);
148 "watchdog registered, timeout interval max. 128 sec\n");
155 * Get time-of-day and convert to a `struct timespec'
156 * Return 0 on success; an error number otherwise.
159 mk48txx_gettime(device_t dev, struct timespec *ts)
161 struct mk48txx_softc *sc;
167 sc = device_get_softc(dev);
168 clkoff = sc->sc_clkoffset;
170 mtx_lock(&sc->sc_mtx);
171 /* enable read (stop time) */
172 csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
173 csr |= MK48TXX_CSR_READ;
174 (*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
176 #define FROMREG(reg, mask) ((*sc->sc_nvrd)(dev, clkoff + (reg)) & (mask))
179 ct.sec = FROMBCD(FROMREG(MK48TXX_ISEC, MK48TXX_SEC_MASK));
180 ct.min = FROMBCD(FROMREG(MK48TXX_IMIN, MK48TXX_MIN_MASK));
181 ct.hour = FROMBCD(FROMREG(MK48TXX_IHOUR, MK48TXX_HOUR_MASK));
182 ct.day = FROMBCD(FROMREG(MK48TXX_IDAY, MK48TXX_DAY_MASK));
184 /* Map dow from 1 - 7 to 0 - 6; FROMBCD() isn't necessary here. */
185 ct.dow = FROMREG(MK48TXX_IWDAY, MK48TXX_WDAY_MASK) - 1;
188 * Set dow = -1 because some drivers (for example the NetBSD and
189 * OpenBSD mk48txx(4)) don't set it correctly.
193 ct.mon = FROMBCD(FROMREG(MK48TXX_IMON, MK48TXX_MON_MASK));
194 year = FROMBCD(FROMREG(MK48TXX_IYEAR, MK48TXX_YEAR_MASK));
195 year += sc->sc_year0;
196 if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST)
197 year += (FROMREG(MK48TXX_IWDAY, MK48TXX_WDAY_CB) >>
198 MK48TXX_WDAY_CB_SHIFT) * 100;
199 else if (year < POSIX_BASE_YEAR)
207 csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
208 csr &= ~MK48TXX_CSR_READ;
209 (*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
210 mtx_unlock(&sc->sc_mtx);
212 return (clock_ct_to_ts(&ct, ts));
216 * Set the time-of-day clock based on the value of the `struct timespec' arg.
217 * Return 0 on success; an error number otherwise.
220 mk48txx_settime(device_t dev, struct timespec *ts)
222 struct mk48txx_softc *sc;
228 sc = device_get_softc(dev);
229 clkoff = sc->sc_clkoffset;
231 /* Accuracy is only one second. */
232 if (ts->tv_nsec >= 500000000)
235 clock_ts_to_ct(ts, &ct);
237 mtx_lock(&sc->sc_mtx);
239 csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
240 csr |= MK48TXX_CSR_WRITE;
241 (*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
243 #define TOREG(reg, mask, val) \
244 ((*sc->sc_nvwr)(dev, clkoff + (reg), \
245 ((*sc->sc_nvrd)(dev, clkoff + (reg)) & ~(mask)) | \
248 TOREG(MK48TXX_ISEC, MK48TXX_SEC_MASK, TOBCD(ct.sec));
249 TOREG(MK48TXX_IMIN, MK48TXX_MIN_MASK, TOBCD(ct.min));
250 TOREG(MK48TXX_IHOUR, MK48TXX_HOUR_MASK, TOBCD(ct.hour));
251 /* Map dow from 0 - 6 to 1 - 7; TOBCD() isn't necessary here. */
252 TOREG(MK48TXX_IWDAY, MK48TXX_WDAY_MASK, ct.dow + 1);
253 TOREG(MK48TXX_IDAY, MK48TXX_DAY_MASK, TOBCD(ct.day));
254 TOREG(MK48TXX_IMON, MK48TXX_MON_MASK, TOBCD(ct.mon));
256 year = ct.year - sc->sc_year0;
257 if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) {
259 TOREG(MK48TXX_IWDAY, MK48TXX_WDAY_CB,
260 cent << MK48TXX_WDAY_CB_SHIFT);
262 } else if (year > 99)
264 TOREG(MK48TXX_IYEAR, MK48TXX_YEAR_MASK, TOBCD(year));
269 csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
270 csr &= ~MK48TXX_CSR_WRITE;
271 (*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
272 mtx_unlock(&sc->sc_mtx);
277 mk48txx_def_nvrd(device_t dev, int off)
279 struct mk48txx_softc *sc;
281 sc = device_get_softc(dev);
282 return (bus_read_1(sc->sc_res, off));
286 mk48txx_def_nvwr(device_t dev, int off, uint8_t v)
288 struct mk48txx_softc *sc;
290 sc = device_get_softc(dev);
291 bus_write_1(sc->sc_res, off, v);
295 mk48txx_watchdog(void *arg, u_int cmd, int *error)
298 struct mk48txx_softc *sc;
302 sc = device_get_softc(dev);
304 t = cmd & WD_INTERVAL;
305 if (t >= 26 && t <= 37) {
307 if (t <= WD_TO_2SEC) {
308 wdog |= MK48TXX_WDOG_RB_1_16;
310 } else if (t <= WD_TO_8SEC) {
311 wdog |= MK48TXX_WDOG_RB_1_4;
313 } else if (t <= WD_TO_32SEC) {
314 wdog |= MK48TXX_WDOG_RB_1;
317 wdog |= MK48TXX_WDOG_RB_4;
321 MK48TXX_WDOG_BMB_MASK >> MK48TXX_WDOG_BMB_SHIFT)) <<
322 MK48TXX_WDOG_BMB_SHIFT;
323 if (sc->sc_flag & MK48TXX_WDOG_ENABLE_WDS)
324 wdog |= MK48TXX_WDOG_WDS;
329 mtx_lock(&sc->sc_mtx);
330 (*sc->sc_nvwr)(dev, sc->sc_clkoffset + MK48TXX_WDOG, wdog);
331 mtx_unlock(&sc->sc_mtx);