NetBSD/sys/dev/ic/intersil7170.c

210 lines
6.4 KiB
C

/* $NetBSD: intersil7170.c,v 1.2 2001/11/13 13:14:38 lukem Exp $ */
/*-
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/*
* Intersil 7170 time-of-day chip subroutines.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: intersil7170.c,v 1.2 2001/11/13 13:14:38 lukem Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <machine/bus.h>
#include <dev/clock_subr.h>
#include <dev/ic/intersil7170.h>
#define intersil_command(run, interrupt) \
(run | interrupt | INTERSIL_CMD_FREQ_32K | INTERSIL_CMD_24HR_MODE | \
INTERSIL_CMD_NORMAL_MODE)
struct intersil7170_softc {
bus_space_tag_t sil_bt;
bus_space_handle_t sil_bh;
int sil_year0;
};
int intersil7170_gettime(todr_chip_handle_t, struct timeval *);
int intersil7170_settime(todr_chip_handle_t, struct timeval *);
int intersil7170_getcal(todr_chip_handle_t, int *);
int intersil7170_setcal(todr_chip_handle_t, int);
int intersil7170_auto_century_adjust = 1;
todr_chip_handle_t
intersil7170_attach(bt, bh, year0)
bus_space_tag_t bt;
bus_space_handle_t bh;
int year0;
{
todr_chip_handle_t handle;
struct intersil7170_softc *sil;
int sz;
printf(": intersil7170");
sz = ALIGN(sizeof(struct todr_chip_handle)) + sizeof(struct intersil7170);
handle = malloc(sz, M_DEVBUF, M_NOWAIT);
sil = (struct intersil7170_softc *)((u_long)handle +
ALIGN(sizeof(struct todr_chip_handle)));
handle->cookie = sil;
handle->todr_gettime = intersil7170_gettime;
handle->todr_settime = intersil7170_settime;
handle->todr_getcal = intersil7170_getcal;
handle->todr_setcal = intersil7170_setcal;
sil->sil_bt = bt;
sil->sil_bh = bh;
sil->sil_year0 = year0;
return (handle);
}
/*
* Set up the system's time, given a `reasonable' time value.
*/
int
intersil7170_gettime(handle, tv)
todr_chip_handle_t handle;
struct timeval *tv;
{
struct intersil7170_softc *sil = handle->cookie;
bus_space_tag_t bt = sil->sil_bt;
bus_space_handle_t bh = sil->sil_bh;
struct clock_ymdhms dt;
u_int8_t cmd;
int year;
int s;
/* No interrupts while we're fiddling with the chip */
s = splhigh();
/* Enable read (stop time) */
cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
/* The order of reading out the clock elements is important */
bus_space_read_1(bt, bh, INTERSIL_ICSEC); /* not used */
dt.dt_hour = bus_space_read_1(bt, bh, INTERSIL_IHOUR);
dt.dt_min = bus_space_read_1(bt, bh, INTERSIL_IMIN);
dt.dt_sec = bus_space_read_1(bt, bh, INTERSIL_ISEC);
dt.dt_mon = bus_space_read_1(bt, bh, INTERSIL_IMON);
dt.dt_day = bus_space_read_1(bt, bh, INTERSIL_IDAY);
year = bus_space_read_1(bt, bh, INTERSIL_IYEAR);
dt.dt_wday = bus_space_read_1(bt, bh, INTERSIL_IDOW);
/* Done writing (time wears on) */
cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
splx(s);
year += sil->sil_year0;
if (year < 1970 && intersil7170_auto_century_adjust != 0)
year += 100;
dt.dt_year = year;
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return (0);
}
/*
* Reset the clock based on the current time.
*/
int
intersil7170_settime(handle, tv)
todr_chip_handle_t handle;
struct timeval *tv;
{
struct intersil7170_softc *sil = handle->cookie;
bus_space_tag_t bt = sil->sil_bt;
bus_space_handle_t bh = sil->sil_bh;
struct clock_ymdhms dt;
u_int8_t cmd;
int year;
int s;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
year = dt.dt_year - sil->sil_year0;
if (year > 99 && intersil7170_auto_century_adjust != 0)
year -= 100;
/* No interrupts while we're fiddling with the chip */
s = splhigh();
/* Enable write (stop time) */
cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
/* The order of reading writing the clock elements is important */
bus_space_write_1(bt, bh, INTERSIL_ICSEC, 0);
bus_space_write_1(bt, bh, INTERSIL_IHOUR, dt.dt_hour);
bus_space_write_1(bt, bh, INTERSIL_IMIN, dt.dt_min);
bus_space_write_1(bt, bh, INTERSIL_ISEC, dt.dt_sec);
bus_space_write_1(bt, bh, INTERSIL_IMON, dt.dt_mon);
bus_space_write_1(bt, bh, INTERSIL_IDAY, dt.dt_day);
bus_space_write_1(bt, bh, INTERSIL_IYEAR, year);
bus_space_write_1(bt, bh, INTERSIL_IDOW, dt.dt_wday);
/* Done writing (time wears on) */
cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
splx(s);
return (0);
}
int
intersil7170_getcal(handle, vp)
todr_chip_handle_t handle;
int *vp;
{
return (EOPNOTSUPP);
}
int
intersil7170_setcal(handle, v)
todr_chip_handle_t handle;
int v;
{
return (EOPNOTSUPP);
}