NetBSD/sys/arch/sparc/dev/rtc.c

276 lines
7.1 KiB
C

/* $NetBSD: rtc.c,v 1.10 2003/07/15 00:04:56 lukem Exp $ */
/*
* Copyright (c) 2001 Valeriy E. Ushakov
* All rights reserved.
*
* 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.
*/
/*
* `rtc' is a DS1287A (== MC146818A) time-of-day clock at EBus.
* In Krups it's not used to store idprom so this driver doesn't
* support it. Don't know about other ms-IIep systems.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.10 2003/07/15 00:04:56 lukem Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#ifdef GPROF
#include <sys/gmon.h>
#endif
#include <machine/bus.h>
#include <machine/autoconf.h>
#include <dev/clock_subr.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ebus/ebusreg.h>
#include <dev/ebus/ebusvar.h>
struct rtc_ebus_softc {
struct device sc_dev;
bus_space_tag_t sc_bt; /* parent bus tag */
bus_space_handle_t sc_bh; /* handle for registers */
};
static int rtcmatch_ebus(struct device *, struct cfdata *, void *);
static void rtcattach_ebus(struct device *, struct device *, void *);
CFATTACH_DECL(rtc_ebus, sizeof(struct rtc_ebus_softc),
rtcmatch_ebus, rtcattach_ebus, NULL, NULL);
/* XXX: global TOD clock handle (sparc/clock.c) */
extern todr_chip_handle_t todr_handle;
/* todr(9) methods */
int rtc_gettime(todr_chip_handle_t, struct timeval *);
int rtc_settime(todr_chip_handle_t, struct timeval *);
int rtc_getcal(todr_chip_handle_t, int *);
int rtc_setcal(todr_chip_handle_t, int);
int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */
/*
* MD read/write functions declared in mc146818reg.h
*/
#define RTC_ADDR 0
#define RTC_DATA 1
u_int
mc146818_read(cookie, reg)
void *cookie;
u_int reg;
{
struct rtc_ebus_softc *sc = cookie;
bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA));
}
void
mc146818_write(cookie, reg, datum)
void *cookie;
u_int reg;
u_int datum;
{
struct rtc_ebus_softc *sc = cookie;
bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum);
}
static int
rtcmatch_ebus(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct ebus_attach_args *ea = aux;
return (strcmp(cf->cf_name, ea->ea_name) == 0);
}
static void
rtcattach_ebus(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
struct rtc_ebus_softc *sc = (void *)self;
struct ebus_attach_args *ea = aux;
todr_chip_handle_t handle;
sc->sc_bt = ea->ea_bustag;
if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
ea->ea_reg[0].size, 0, &sc->sc_bh) != 0)
{
printf(": unable to map registers\n");
return;
}
/* XXX: no "model" property in Krups */
printf(": time-of-day clock\n");
/*
* Turn interrupts off (clear MC_REGB_?IE bits), just in case
* (although they shouldn't be wired to an interrupt
* controller on sparcs).
*/
mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
/* setup our todr_handle */
handle = malloc(ALIGN(sizeof(struct todr_chip_handle)),
M_DEVBUF, M_NOWAIT);
handle->cookie = sc;
handle->bus_cookie = NULL; /* unused */
handle->todr_gettime = rtc_gettime;
handle->todr_settime = rtc_settime;
handle->todr_getcal = rtc_getcal;
handle->todr_setcal = rtc_setcal;
handle->todr_setwen = NULL; /* not necessary, no idprom to protect */
todr_handle = handle;
}
/*
* Get time-of-day and convert to a `struct timeval'
* Return 0 on success; an error number otherwise.
*/
int
rtc_gettime(handle, tv)
todr_chip_handle_t handle;
struct timeval *tv;
{
struct rtc_ebus_softc *sc = handle->cookie;
struct clock_ymdhms dt;
u_int year;
/* update in progress; spin loop */
while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP)
continue;
/* stop updates (XXX: do we need that???) */
mc146818_write(sc, MC_REGB,
(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
/* read time */
dt.dt_sec = mc146818_read(sc, MC_SEC);
dt.dt_min = mc146818_read(sc, MC_MIN);
dt.dt_hour = mc146818_read(sc, MC_HOUR);
dt.dt_day = mc146818_read(sc, MC_DOM);
dt.dt_mon = mc146818_read(sc, MC_MONTH);
year = mc146818_read(sc, MC_YEAR);
/* reenable updates */
mc146818_write(sc, MC_REGB,
(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
/* year in the century 0..99: adjust to AD */
year += 1900;
if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0)
year += 100;
dt.dt_year = year;
/* simple sanity checks */
if (dt.dt_mon > 12 || dt.dt_day > 31
|| dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60)
return (ERANGE);
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return (0);
}
/*
* Set the time-of-day clock based on the value of the `struct timeval' arg.
* Return 0 on success; an error number otherwise.
*/
int
rtc_settime(handle, tv)
todr_chip_handle_t handle;
struct timeval *tv;
{
struct rtc_ebus_softc *sc = handle->cookie;
struct clock_ymdhms dt;
u_int year;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
year = dt.dt_year - 1900;
if (year >= 100 && rtc_auto_century_adjust != 0)
year -= 100;
/* stop updates */
mc146818_write(sc, MC_REGB,
(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
mc146818_write(sc, MC_SEC, dt.dt_sec);
mc146818_write(sc, MC_MIN, dt.dt_min);
mc146818_write(sc, MC_HOUR, dt.dt_hour);
mc146818_write(sc, MC_DOW, dt.dt_wday + 1);
mc146818_write(sc, MC_DOM, dt.dt_day);
mc146818_write(sc, MC_MONTH, dt.dt_mon);
mc146818_write(sc, MC_YEAR, year);
/* reenable updates */
mc146818_write(sc, MC_REGB,
(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
return (0);
}
/*
* RTC does not support TOD clock calibration
*/
/* ARGSUSED */
int
rtc_getcal(handle, vp)
todr_chip_handle_t handle;
int *vp;
{
return (EOPNOTSUPP);
}
/* ARGSUSED */
int
rtc_setcal(handle, v)
todr_chip_handle_t handle;
int v;
{
return (EOPNOTSUPP);
}