NetBSD-5.0.2/sys/arch/hp300/dev/rtc.c
/* $NetBSD: rtc.c,v 1.19 2008/03/29 06:47:08 tsutsui Exp $ */
/*
* Copyright (c) 1982, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* from: Utah $Hdr: clock.c 1.18 91/01/21$
*
* @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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 University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* from: Utah $Hdr: clock.c 1.18 91/01/21$
*
* @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* attachment for HP300 real-time clock (RTC)
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.19 2008/03/29 06:47:08 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <hp300/dev/intiovar.h>
#include <hp300/dev/rtcreg.h>
#include <dev/clock_subr.h>
struct rtc_softc {
device_t sc_dev;
bus_space_tag_t sc_bst;
bus_space_handle_t sc_bsh;
struct todr_chip_handle sc_handle;
};
static int rtcmatch(device_t, cfdata_t, void *);
static void rtcattach(device_t, device_t, void *aux);
CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc),
rtcmatch, rtcattach, NULL, NULL);
static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static uint8_t rtc_readreg(struct rtc_softc *, int);
static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t);
static int
rtcmatch(device_t parent, cfdata_t cf, void *aux)
{
struct intio_attach_args *ia = aux;
if (strcmp("rtc", ia->ia_modname) != 0)
return 0;
return 1;
}
static void
rtcattach(device_t parent, device_t self, void *aux)
{
struct rtc_softc *sc = device_private(self);
struct intio_attach_args *ia = aux;
struct todr_chip_handle *todr_handle;
bus_space_tag_t bst = ia->ia_bst;
sc->sc_dev = self;
if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0,
&sc->sc_bsh)) {
aprint_error(": can't map registers\n");
return;
}
aprint_normal("\n");
sc->sc_bst = bst;
todr_handle = &sc->sc_handle;
todr_handle->cookie = sc;
todr_handle->todr_gettime = NULL;
todr_handle->todr_settime = NULL;
todr_handle->todr_gettime_ymdhms = rtc_gettime_ymdhms;
todr_handle->todr_settime_ymdhms = rtc_settime_ymdhms;
todr_handle->todr_setwen = NULL;
todr_attach(todr_handle);
}
static int
rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
struct rtc_softc *sc;
int i, year;
bool read_okay;
uint8_t rtc_registers[NUM_RTC_REGS];
sc = handle->cookie;
/* read rtc registers */
read_okay = false;
while (!read_okay) {
read_okay = true;
for (i = 0; i < NUM_RTC_REGS; i++)
rtc_registers[i] = rtc_readreg(sc, i);
for (i = 0; i < NUM_RTC_REGS; i++)
if (rtc_registers[i] != rtc_readreg(sc, i))
read_okay = false;
}
#define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b])
dt->dt_sec = rtc_to_decimal(1, 0);
dt->dt_min = rtc_to_decimal(3, 2);
dt->dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 +
rtc_registers[4];
dt->dt_day = rtc_to_decimal(8, 7);
dt->dt_mon = rtc_to_decimal(10, 9);
year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR;
if (year < POSIX_BASE_YEAR)
year += 100;
dt->dt_year = year;
#undef rtc_to_decimal
return 0;
}
static int
rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
struct rtc_softc *sc;
int i, year;
uint8_t rtc_registers[NUM_RTC_REGS];
sc = handle->cookie;
year = dt->dt_year - RTC_BASE_YEAR;
if (year > 99)
year -= 100;
#define decimal_to_rtc(a,b,n) \
rtc_registers[a] = (n) % 10; \
rtc_registers[b] = (n) / 10;
decimal_to_rtc(0, 1, dt->dt_sec);
decimal_to_rtc(2, 3, dt->dt_min);
decimal_to_rtc(7, 8, dt->dt_day);
decimal_to_rtc(9, 10, dt->dt_mon);
decimal_to_rtc(11, 12, year);
rtc_registers[4] = dt->dt_hour % 10;
rtc_registers[5] = ((dt->dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR;
rtc_registers[6] = 0;
#undef decimal_to_rtc
/* write rtc registers */
rtc_writereg(sc, 15, 13); /* reset prescalar */
for (i = 0; i < NUM_RTC_REGS; i++)
if (rtc_registers[i] !=
rtc_writereg(sc, i, rtc_registers[i]))
return 1;
return 0;
}
static uint8_t
rtc_readreg(struct rtc_softc *sc, int reg)
{
bus_space_tag_t bst = sc->sc_bst;
bus_space_handle_t bsh = sc->sc_bsh;
uint8_t data;
int s = splvm();
data = reg;
intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1);
intio_device_readcmd(bst, bsh, RTC_READ_REG, &data);
splx(s);
return data;
}
static uint8_t
rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data)
{
bus_space_tag_t bst = sc->sc_bst;
bus_space_handle_t bsh = sc->sc_bsh;
uint8_t tmp;
int s = splvm();
tmp = (data << 4) | reg;
intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1);
intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0);
intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp);
splx(s);
return tmp;
}