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/* $OpenBSD: dsclock.c,v 1.4 2012/10/03 22:46:09 miod Exp $ */
/* $NetBSD: dsclock.c,v 1.5 2011/07/01 18:53:46 dyoung Exp $ */
/*
* Copyright (c) 2001 Rafal K. Boni
* Copyright (c) 2001 Christopher Sekiya
* Copyright (c) 1998, 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Portions of this code are derived from software contributed to The
* NetBSD Foundation by Jason R. Thorpe of the Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <mips64/dev/clockvar.h>
#include <dev/ic/ds1286reg.h>
#include <sgi/hpc/hpcvar.h>
#include <sgi/sgi/ip22.h>
struct dsclock_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint sc_base;
};
int dsclock_match(struct device *, void *, void *);
void dsclock_attach(struct device *, struct device *, void *);
struct cfdriver dsclock_cd = {
NULL, "dsclock", DV_DULL
};
const struct cfattach dsclock_ca = {
sizeof(struct dsclock_softc), dsclock_match, dsclock_attach
};
#define ds1286_read(sc,r) \
bus_space_read_1((sc)->sc_iot, (sc)->sc_ioh, ((r) << 2) + 3)
#define ds1286_write(sc,r,v) \
bus_space_write_1((sc)->sc_iot, (sc)->sc_ioh, ((r) << 2) + 3, (v))
static inline int frombcd(int);
static inline int tobcd(int);
static inline int
frombcd(int x)
{
return (x >> 4) * 10 + (x & 0xf);
}
static inline int
tobcd(int x)
{
return (x / 10 * 16) + (x % 10);
}
void dsclock_gettime(void *, time_t, struct tod_time *);
void dsclock_settime(void *, struct tod_time *);
int
dsclock_match(struct device *parent, void *vcf, void *aux)
{
struct hpc_attach_args *haa = aux;
if (strcmp(haa->ha_name, dsclock_cd.cd_name) != 0)
return 0;
return 1;
}
void
dsclock_attach(struct device *parent, struct device *self, void *aux)
{
struct dsclock_softc *sc = (void *)self;
struct hpc_attach_args *haa = aux;
ds1286_todregs regs;
sc->sc_iot = haa->ha_st;
if (bus_space_subregion(haa->ha_st, haa->ha_sh, haa->ha_devoff,
4 * 8192, &sc->sc_ioh) != 0) {
printf(": can't map registers\n");
return;
}
printf("\n");
sys_tod.tod_get = dsclock_gettime;
sys_tod.tod_set = dsclock_settime;
sys_tod.tod_cookie = self;
/*
* Try and figure out what year the chip time is relative to.
* Different Indy PROM versions appear to use different base:
* PROM Monitor SGI Version 5.1 Rev B3 IP24 Sep 17, 1993 (BE)
* uses 1970, while
* PROM Monitor SGI Version 5.3 Rev B10 R4X00/R5000 IP24 Feb 12, 1996 (BE)
* uses 1940.
*/
DS1286_GETTOD(sc, ®s);
sc->sc_base = bios_year - frombcd(regs[DS1286_YEAR]);
/* year might have changed between the ARCBios call and now... */
if ((sc->sc_base % 10) == 9)
sc->sc_base++;
/*
* If the data in the chip does not make sense, assume the usual
* IRIX timebase (1940 because it's a leap year).
*/
if (sc->sc_base != 1940 && sc->sc_base != POSIX_BASE_YEAR)
sc->sc_base = 1940;
/* mips64 clock code expects year relative to 1900 */
sc->sc_base -= 1900;
}
/*
* Get the time of day, based on the clock's value and/or the base value.
*/
void
dsclock_gettime(void *cookie, time_t base, struct tod_time *ct)
{
struct dsclock_softc *sc = (void *)cookie;
ds1286_todregs regs;
int s;
s = splhigh();
DS1286_GETTOD(sc, ®s)
splx(s);
ct->sec = frombcd(regs[DS1286_SEC]);
ct->min = frombcd(regs[DS1286_MIN]);
if (regs[DS1286_HOUR] & DS1286_HOUR_12MODE) {
ct->hour = frombcd(regs[DS1286_HOUR] & DS1286_HOUR_12HR_MASK) +
((regs[DS1286_HOUR] & DS1286_HOUR_12HR_PM) ? 12 : 0);
/*
* In AM/PM mode, hour range is 01-12, so adding in 12 hours
* for PM gives us 01-24, whereas we want 00-23, so map hour
* 24 to hour 0.
*/
if (ct->hour == 24)
ct->hour = 0;
} else {
ct->hour = frombcd(regs[DS1286_HOUR] & DS1286_HOUR_24HR_MASK);
}
ct->day = frombcd(regs[DS1286_DOM]);
ct->mon = frombcd(regs[DS1286_MONTH] & DS1286_MONTH_MASK);
ct->year = frombcd(regs[DS1286_YEAR]) + sc->sc_base;
}
/*
* Reset the TODR based on the time value.
*/
void
dsclock_settime(void *cookie, struct tod_time *ct)
{
struct dsclock_softc *sc = (void *)cookie;
ds1286_todregs regs;
int s;
s = splhigh();
DS1286_GETTOD(sc, ®s);
splx(s);
regs[DS1286_SUBSEC] = 0;
regs[DS1286_SEC] = tobcd(ct->sec);
regs[DS1286_MIN] = tobcd(ct->min);
regs[DS1286_HOUR] = tobcd(ct->hour) & DS1286_HOUR_24HR_MASK;
regs[DS1286_DOW] = tobcd(ct->dow);
regs[DS1286_DOM] = tobcd(ct->day);
/* Leave wave-generator bits as set originally */
regs[DS1286_MONTH] &= ~DS1286_MONTH_MASK;
regs[DS1286_MONTH] |= tobcd(ct->mon) & DS1286_MONTH_MASK;
regs[DS1286_YEAR] = tobcd(ct->year - sc->sc_base);
s = splhigh();
DS1286_PUTTOD(sc, ®s);
splx(s);
}
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