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/* $OpenBSD: dsrtc.c,v 1.2 2009/04/13 21:17:54 miod Exp $ */
/*
* Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se / www.opsycon.com)
*
* 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 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 <dev/ic/ds1687reg.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <mips64/archtype.h>
#include <mips64/dev/clockvar.h>
#include <sgi/localbus/macebus.h>
#include <sgi/pci/iocreg.h>
#include <sgi/pci/iocvar.h>
bus_space_handle_t clock_h; /* XXX */
struct dsrtc_softc {
struct device sc_dev;
bus_space_tag_t sc_clkt;
bus_space_handle_t sc_clkh, sc_clkh2;
int (*read)(struct dsrtc_softc *, int);
void (*write)(struct dsrtc_softc *, int, int);
};
int dsrtc_match_ioc(struct device *, void *, void *);
void dsrtc_attach_ioc(struct device *, struct device *, void *);
int dsrtc_match_macebus(struct device *, void *, void *);
void dsrtc_attach_macebus(struct device *, struct device *, void *);
struct cfdriver dsrtc_cd = {
NULL, "dsrtc", DV_DULL
};
struct cfattach dsrtc_macebus_ca = {
sizeof(struct dsrtc_softc), dsrtc_match_macebus, dsrtc_attach_macebus
};
struct cfattach dsrtc_ioc_ca = {
sizeof(struct dsrtc_softc), dsrtc_match_ioc, dsrtc_attach_ioc
};
int ip32_dsrtc_read(struct dsrtc_softc *, int);
void ip32_dsrtc_write(struct dsrtc_softc *, int, int);
int ip30_dsrtc_read(struct dsrtc_softc *, int);
void ip30_dsrtc_write(struct dsrtc_softc *, int, int);
void ds1687_get(void *, time_t, struct tod_time *);
void ds1687_set(void *, struct tod_time *);
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);
}
int
dsrtc_match_ioc(struct device *parent, void *match, void *aux)
{
switch (sys_config.system_type) {
case SGI_OCTANE:
case SGI_O200:
return 1;
default:
return 0;
}
}
void
dsrtc_attach_ioc(struct device *parent, struct device *self, void *aux)
{
struct dsrtc_softc *sc = (void *)self;
struct ioc_attach_args *iaa = aux;
sc->sc_clkt = iaa->iaa_memt;
if (bus_space_map(sc->sc_clkt, IOC3_BYTEBUS_1, 1, 0, &sc->sc_clkh) ||
bus_space_map(sc->sc_clkt, IOC3_BYTEBUS_2, 1, 0, &sc->sc_clkh2)) {
printf(": can't map registers\n");
return;
}
printf(": DS1687\n");
sc->read = ip30_dsrtc_read;
sc->write = ip30_dsrtc_write;
sys_tod.tod_cookie = self;
sys_tod.tod_get = ds1687_get;
sys_tod.tod_set = ds1687_set;
}
int
dsrtc_match_macebus(struct device *parent, void *match, void *aux)
{
return 1;
}
void
dsrtc_attach_macebus(struct device *parent, struct device *self, void *aux)
{
struct dsrtc_softc *sc = (void *)self;
struct confargs *ca = aux;
sc->sc_clkt = ca->ca_iot;
if (bus_space_map(sc->sc_clkt, MACE_ISA_RTC_OFFS, 128*256, 0,
&sc->sc_clkh)) {
printf(": can't map registers\n");
return;
}
printf(": DS1687\n");
sc->read = ip32_dsrtc_read;
sc->write = ip32_dsrtc_write;
sys_tod.tod_cookie = self;
sys_tod.tod_get = ds1687_get;
sys_tod.tod_set = ds1687_set;
/*
* XXX Expose the clock address space so that it can be used
* outside of clock(4). This is rather inelegant, however it
* will have to do for now...
*/
clock_h = sc->sc_clkh;
}
int
ip32_dsrtc_read(struct dsrtc_softc *sc, int reg)
{
return bus_space_read_1(sc->sc_clkt, sc->sc_clkh, reg);
}
void
ip32_dsrtc_write(struct dsrtc_softc *sc, int reg, int val)
{
bus_space_write_1(sc->sc_clkt, sc->sc_clkh, reg, val);
}
int
ip30_dsrtc_read(struct dsrtc_softc *sc, int reg)
{
bus_space_write_1(sc->sc_clkt, sc->sc_clkh, 0, reg);
return bus_space_read_1(sc->sc_clkt, sc->sc_clkh2, 0);
}
void
ip30_dsrtc_write(struct dsrtc_softc *sc, int reg, int val)
{
bus_space_write_1(sc->sc_clkt, sc->sc_clkh, 0, reg);
bus_space_write_1(sc->sc_clkt, sc->sc_clkh2, 0, val);
}
/*
* Dallas clock driver.
*/
void
ds1687_get(void *v, time_t base, struct tod_time *ct)
{
struct dsrtc_softc *sc = v;
int ctrl, century;
/* Select bank 1. */
ctrl = (*sc->read)(sc, DS1687_CTRL_A);
(*sc->write)(sc, DS1687_CTRL_A, ctrl | DS1687_BANK_1);
/* Wait for no update in progress. */
while ((*sc->read)(sc, DS1687_CTRL_A) & DS1687_UIP)
/* Do nothing. */;
/* Read the RTC. */
ct->sec = frombcd((*sc->read)(sc, DS1687_SEC));
ct->min = frombcd((*sc->read)(sc, DS1687_MIN));
ct->hour = frombcd((*sc->read)(sc, DS1687_HOUR));
ct->day = frombcd((*sc->read)(sc, DS1687_DAY));
ct->mon = frombcd((*sc->read)(sc, DS1687_MONTH));
ct->year = frombcd((*sc->read)(sc, DS1687_YEAR));
century = frombcd((*sc->read)(sc, DS1687_CENTURY));
ct->year += 100 * (century - 19);
}
void
ds1687_set(void *v, struct tod_time *ct)
{
struct dsrtc_softc *sc = v;
int year, century, ctrl;
century = ct->year / 100 + 19;
year = ct->year % 100;
/* Select bank 1. */
ctrl = (*sc->read)(sc, DS1687_CTRL_A);
(*sc->write)(sc, DS1687_CTRL_A, ctrl | DS1687_BANK_1);
/* Select data mode 0 (BCD) and 24 hour time. */
ctrl = (*sc->read)(sc, DS1687_CTRL_B);
(*sc->write)(sc, DS1687_CTRL_B,
(ctrl & ~DS1687_DM_1) | DS1687_24_HR);
/* Prevent updates. */
ctrl = (*sc->read)(sc, DS1687_CTRL_B);
(*sc->write)(sc, DS1687_CTRL_B, ctrl | DS1687_SET_CLOCK);
/* Update the RTC. */
(*sc->write)(sc, DS1687_SEC, tobcd(ct->sec));
(*sc->write)(sc, DS1687_MIN, tobcd(ct->min));
(*sc->write)(sc, DS1687_HOUR, tobcd(ct->hour));
(*sc->write)(sc, DS1687_DOW, tobcd(ct->dow));
(*sc->write)(sc, DS1687_DAY, tobcd(ct->day));
(*sc->write)(sc, DS1687_MONTH, tobcd(ct->mon));
(*sc->write)(sc, DS1687_YEAR, tobcd(year));
(*sc->write)(sc, DS1687_CENTURY, tobcd(century));
/* Enable updates. */
(*sc->write)(sc, DS1687_CTRL_B, ctrl);
}
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