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/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*
* $NetBSD: mk48txx.c,v 1.25 2008/04/28 20:23:50 martin Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/mk48txx/mk48txx.c 221957 2011-05-15 13:17:08Z marius $");
/*
* Mostek MK48T02, MK48T08, MK48T18, MK48T37 and MK48T59 time-of-day chip
* subroutines
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <dev/mk48txx/mk48txxreg.h>
#include <dev/mk48txx/mk48txxvar.h>
#include "clock_if.h"
static uint8_t mk48txx_def_nvrd(device_t dev, int off);
static void mk48txx_def_nvwr(device_t dev, int off, uint8_t v);
static void mk48txx_watchdog(void *arg, u_int cmd, int *error);
static const struct {
const char *name;
bus_size_t nvramsz;
bus_size_t clkoff;
u_int flags;
#define MK48TXX_EXT_REGISTERS 1 /* Has extended register set. */
} const mk48txx_models[] = {
{ "mk48t02", MK48T02_CLKSZ, MK48T02_CLKOFF, 0 },
{ "mk48t08", MK48T08_CLKSZ, MK48T08_CLKOFF, 0 },
{ "mk48t18", MK48T18_CLKSZ, MK48T18_CLKOFF, 0 },
{ "mk48t37", MK48T37_CLKSZ, MK48T37_CLKOFF, MK48TXX_EXT_REGISTERS },
{ "mk48t59", MK48T59_CLKSZ, MK48T59_CLKOFF, MK48TXX_EXT_REGISTERS },
};
int
mk48txx_attach(device_t dev)
{
struct mk48txx_softc *sc;
int i;
uint8_t wday;
sc = device_get_softc(dev);
if (mtx_initialized(&sc->sc_mtx) == 0) {
device_printf(dev, "%s: mutex not initialized\n", __func__);
return (ENXIO);
}
device_printf(dev, "model %s", sc->sc_model);
i = sizeof(mk48txx_models) / sizeof(mk48txx_models[0]);
while (--i >= 0) {
if (strcmp(sc->sc_model, mk48txx_models[i].name) == 0) {
break;
}
}
if (i < 0) {
device_printf(dev, " (unsupported)\n");
return (ENXIO);
}
printf("\n");
sc->sc_nvramsz = mk48txx_models[i].nvramsz;
sc->sc_clkoffset = mk48txx_models[i].clkoff;
if (sc->sc_nvrd == NULL)
sc->sc_nvrd = mk48txx_def_nvrd;
if (sc->sc_nvwr == NULL)
sc->sc_nvwr = mk48txx_def_nvwr;
if (mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS) {
mtx_lock(&sc->sc_mtx);
if ((*sc->sc_nvrd)(dev, sc->sc_clkoffset + MK48TXX_FLAGS) &
MK48TXX_FLAGS_BL) {
mtx_unlock(&sc->sc_mtx);
device_printf(dev, "%s: battery low\n", __func__);
return (ENXIO);
}
mtx_unlock(&sc->sc_mtx);
}
if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) {
/*
* Use MK48TXX_WDAY_CB instead of manually adjusting the
* century.
*/
if (!(mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS)) {
device_printf(dev, "%s: no century bit\n", __func__);
return (ENXIO);
} else {
mtx_lock(&sc->sc_mtx);
wday = (*sc->sc_nvrd)
(dev, sc->sc_clkoffset + MK48TXX_IWDAY);
wday |= MK48TXX_WDAY_CEB;
(*sc->sc_nvwr)
(dev, sc->sc_clkoffset + MK48TXX_IWDAY, wday);
mtx_unlock(&sc->sc_mtx);
}
}
clock_register(dev, 1000000); /* 1 second resolution */
if ((sc->sc_flag & MK48TXX_WDOG_REGISTER) &&
(mk48txx_models[i].flags & MK48TXX_EXT_REGISTERS)) {
sc->sc_wet = EVENTHANDLER_REGISTER(watchdog_list,
mk48txx_watchdog, dev, 0);
device_printf(dev,
"watchdog registered, timeout interval max. 128 sec\n");
}
return (0);
}
/*
* Get time-of-day and convert to a `struct timespec'
* Return 0 on success; an error number otherwise.
*/
int
mk48txx_gettime(device_t dev, struct timespec *ts)
{
struct mk48txx_softc *sc;
bus_size_t clkoff;
struct clocktime ct;
int year;
uint8_t csr;
sc = device_get_softc(dev);
clkoff = sc->sc_clkoffset;
mtx_lock(&sc->sc_mtx);
/* enable read (stop time) */
csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
csr |= MK48TXX_CSR_READ;
(*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
#define FROMREG(reg, mask) ((*sc->sc_nvrd)(dev, clkoff + (reg)) & (mask))
ct.nsec = 0;
ct.sec = FROMBCD(FROMREG(MK48TXX_ISEC, MK48TXX_SEC_MASK));
ct.min = FROMBCD(FROMREG(MK48TXX_IMIN, MK48TXX_MIN_MASK));
ct.hour = FROMBCD(FROMREG(MK48TXX_IHOUR, MK48TXX_HOUR_MASK));
ct.day = FROMBCD(FROMREG(MK48TXX_IDAY, MK48TXX_DAY_MASK));
#if 0
/* Map dow from 1 - 7 to 0 - 6; FROMBCD() isn't necessary here. */
ct.dow = FROMREG(MK48TXX_IWDAY, MK48TXX_WDAY_MASK) - 1;
#else
/*
* Set dow = -1 because some drivers (for example the NetBSD and
* OpenBSD mk48txx(4)) don't set it correctly.
*/
ct.dow = -1;
#endif
ct.mon = FROMBCD(FROMREG(MK48TXX_IMON, MK48TXX_MON_MASK));
year = FROMBCD(FROMREG(MK48TXX_IYEAR, MK48TXX_YEAR_MASK));
year += sc->sc_year0;
if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST)
year += (FROMREG(MK48TXX_IWDAY, MK48TXX_WDAY_CB) >>
MK48TXX_WDAY_CB_SHIFT) * 100;
else if (year < POSIX_BASE_YEAR)
year += 100;
#undef FROMREG
ct.year = year;
/* time wears on */
csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
csr &= ~MK48TXX_CSR_READ;
(*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
mtx_unlock(&sc->sc_mtx);
return (clock_ct_to_ts(&ct, ts));
}
/*
* Set the time-of-day clock based on the value of the `struct timespec' arg.
* Return 0 on success; an error number otherwise.
*/
int
mk48txx_settime(device_t dev, struct timespec *ts)
{
struct mk48txx_softc *sc;
bus_size_t clkoff;
struct clocktime ct;
uint8_t csr;
int cent, year;
sc = device_get_softc(dev);
clkoff = sc->sc_clkoffset;
/* Accuracy is only one second. */
if (ts->tv_nsec >= 500000000)
ts->tv_sec++;
ts->tv_nsec = 0;
clock_ts_to_ct(ts, &ct);
mtx_lock(&sc->sc_mtx);
/* enable write */
csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
csr |= MK48TXX_CSR_WRITE;
(*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
#define TOREG(reg, mask, val) \
((*sc->sc_nvwr)(dev, clkoff + (reg), \
((*sc->sc_nvrd)(dev, clkoff + (reg)) & ~(mask)) | \
((val) & (mask))))
TOREG(MK48TXX_ISEC, MK48TXX_SEC_MASK, TOBCD(ct.sec));
TOREG(MK48TXX_IMIN, MK48TXX_MIN_MASK, TOBCD(ct.min));
TOREG(MK48TXX_IHOUR, MK48TXX_HOUR_MASK, TOBCD(ct.hour));
/* Map dow from 0 - 6 to 1 - 7; TOBCD() isn't necessary here. */
TOREG(MK48TXX_IWDAY, MK48TXX_WDAY_MASK, ct.dow + 1);
TOREG(MK48TXX_IDAY, MK48TXX_DAY_MASK, TOBCD(ct.day));
TOREG(MK48TXX_IMON, MK48TXX_MON_MASK, TOBCD(ct.mon));
year = ct.year - sc->sc_year0;
if (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) {
cent = year / 100;
TOREG(MK48TXX_IWDAY, MK48TXX_WDAY_CB,
cent << MK48TXX_WDAY_CB_SHIFT);
year -= cent * 100;
} else if (year > 99)
year -= 100;
TOREG(MK48TXX_IYEAR, MK48TXX_YEAR_MASK, TOBCD(year));
#undef TOREG
/* load them up */
csr = (*sc->sc_nvrd)(dev, clkoff + MK48TXX_ICSR);
csr &= ~MK48TXX_CSR_WRITE;
(*sc->sc_nvwr)(dev, clkoff + MK48TXX_ICSR, csr);
mtx_unlock(&sc->sc_mtx);
return (0);
}
static uint8_t
mk48txx_def_nvrd(device_t dev, int off)
{
struct mk48txx_softc *sc;
sc = device_get_softc(dev);
return (bus_read_1(sc->sc_res, off));
}
static void
mk48txx_def_nvwr(device_t dev, int off, uint8_t v)
{
struct mk48txx_softc *sc;
sc = device_get_softc(dev);
bus_write_1(sc->sc_res, off, v);
}
static void
mk48txx_watchdog(void *arg, u_int cmd, int *error)
{
device_t dev;
struct mk48txx_softc *sc;
uint8_t t, wdog;
dev = arg;
sc = device_get_softc(dev);
t = cmd & WD_INTERVAL;
if (t >= 26 && t <= 37) {
wdog = 0;
if (t <= WD_TO_2SEC) {
wdog |= MK48TXX_WDOG_RB_1_16;
t -= 26;
} else if (t <= WD_TO_8SEC) {
wdog |= MK48TXX_WDOG_RB_1_4;
t -= WD_TO_250MS;
} else if (t <= WD_TO_32SEC) {
wdog |= MK48TXX_WDOG_RB_1;
t -= WD_TO_1SEC;
} else {
wdog |= MK48TXX_WDOG_RB_4;
t -= WD_TO_4SEC;
}
wdog |= (min(1 << t,
MK48TXX_WDOG_BMB_MASK >> MK48TXX_WDOG_BMB_SHIFT)) <<
MK48TXX_WDOG_BMB_SHIFT;
if (sc->sc_flag & MK48TXX_WDOG_ENABLE_WDS)
wdog |= MK48TXX_WDOG_WDS;
*error = 0;
} else {
wdog = 0;
}
mtx_lock(&sc->sc_mtx);
(*sc->sc_nvwr)(dev, sc->sc_clkoffset + MK48TXX_WDOG, wdog);
mtx_unlock(&sc->sc_mtx);
}