/* $NetBSD: rtc.c,v 1.10 2014/11/20 16:34:26 christos Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.10 2014/11/20 16:34:26 christos 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 <dev/clock_subr.h>
#include <sh3/rtcreg.h>
#if defined(DEBUG) && !defined(RTC_DEBUG)
#define RTC_DEBUG
#endif
struct rtc_softc {
device_t sc_dev;
int sc_valid;
struct todr_chip_handle sc_todr;
u_int sc_year0;
};
static int rtc_match(device_t, cfdata_t, void *);
static void rtc_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc),
rtc_match, rtc_attach, NULL, NULL);
/* todr(9) methods */
static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
#ifndef SH3_RTC_BASEYEAR
#define SH3_RTC_BASEYEAR 1900
#endif
u_int sh3_rtc_baseyear = SH3_RTC_BASEYEAR;
static int
rtc_match(device_t parent, cfdata_t cfp, void *aux)
{
return 1;
}
static void
rtc_attach(device_t parent, device_t self, void *aux)
{
struct rtc_softc *sc;
uint8_t r;
prop_number_t prop_rtc_baseyear;
#ifdef RTC_DEBUG
char bits[128];
#endif
aprint_naive("\n");
aprint_normal("\n");
sc = device_private(self);
sc->sc_dev = self;
r = _reg_read_1(SH_(RCR2));
#ifdef RTC_DEBUG
snprintb(bits, sizeof(bits), SH_RCR2_BITS, r);
aprint_debug_dev(sc->sc_dev, "RCR2=%s\n", bits);
#endif
/* Was the clock running? */
if ((r & (SH_RCR2_ENABLE | SH_RCR2_START)) == (SH_RCR2_ENABLE
| SH_RCR2_START))
sc->sc_valid = 1;
else {
sc->sc_valid = 0;
aprint_error_dev(sc->sc_dev, "WARNING: clock was stopped\n");
}
/* Disable carry and alarm interrupts */
_reg_write_1(SH_(RCR1), 0);
/* Clock runs, no periodic interrupts, no 30-sec adjustment */
_reg_write_1(SH_(RCR2), SH_RCR2_ENABLE | SH_RCR2_START);
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime_ymdhms = rtc_gettime_ymdhms;
sc->sc_todr.todr_settime_ymdhms = rtc_settime_ymdhms;
prop_rtc_baseyear = prop_dictionary_get(device_properties(self),
"sh3_rtc_baseyear");
if (prop_rtc_baseyear != NULL) {
sh3_rtc_baseyear =
(u_int)prop_number_integer_value(prop_rtc_baseyear);
#ifdef RTC_DEBUG
aprint_debug_dev(self,
"using baseyear %u passed via device property\n",
sh3_rtc_baseyear);
#endif
}
sc->sc_year0 = sh3_rtc_baseyear;
todr_attach(&sc->sc_todr);
#ifdef RTC_DEBUG
{
struct clock_ymdhms dt;
rtc_gettime_ymdhms(&sc->sc_todr, &dt);
}
#endif
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "unable to establish power handler\n");
}
static int
rtc_gettime_ymdhms(todr_chip_handle_t h, struct clock_ymdhms *dt)
{
struct rtc_softc *sc = h->cookie;
unsigned int year;
int retry = 8;
if (!sc->sc_valid) {
#ifdef RTC_DEBUG
aprint_debug_dev(sc->sc_dev, "gettime: not valid\n");
/* but proceed and read/print it anyway */
#else
return EIO;
#endif
}
/* disable carry interrupt */
_reg_bclr_1(SH_(RCR1), SH_RCR1_CIE);
do {
uint8_t r = _reg_read_1(SH_(RCR1));
r &= ~SH_RCR1_CF;
r |= SH_RCR1_AF; /* don't clear alarm flag */
_reg_write_1(SH_(RCR1), r);
if (CPU_IS_SH3)
year = _reg_read_1(SH3_RYRCNT);
else
year = _reg_read_2(SH4_RYRCNT) & 0x00ff;
dt->dt_year = bcdtobin(year);
/* read counter */
#define RTCGET(x, y) \
dt->dt_ ## x = bcdtobin(_reg_read_1(SH_(R ## y ## CNT)))
RTCGET(mon, MON);
RTCGET(wday, WK);
RTCGET(day, DAY);
RTCGET(hour, HR);
RTCGET(min, MIN);
RTCGET(sec, SEC);
#undef RTCGET
} while ((_reg_read_1(SH_(RCR1)) & SH_RCR1_CF) && --retry > 0);
if (retry == 0) {
#ifdef RTC_DEBUG
aprint_debug_dev(sc->sc_dev, "gettime: retry failed\n");
#endif
return EIO;
}
dt->dt_year += sc->sc_year0;
if (dt->dt_year < POSIX_BASE_YEAR)
dt->dt_year += 100;
#ifdef RTC_DEBUG
aprint_debug_dev(sc->sc_dev,
"gettime: %04lu-%02d-%02d %02d:%02d:%02d\n",
(unsigned long)dt->dt_year, dt->dt_mon, dt->dt_day,
dt->dt_hour, dt->dt_min, dt->dt_sec);
if (!sc->sc_valid)
return EIO;
#endif
return 0;
}
static int
rtc_settime_ymdhms(todr_chip_handle_t h, struct clock_ymdhms *dt)
{
struct rtc_softc *sc = h->cookie;
unsigned int year;
uint8_t r;
year = dt->dt_year - sc->sc_year0;
if (year > 99)
year -= 100;
year = bintobcd(year);
r = _reg_read_1(SH_(RCR2));
/* stop clock */
_reg_write_1(SH_(RCR2), (r & ~SH_RCR2_START) | SH_RCR2_RESET);
/* set time */
if (CPU_IS_SH3)
_reg_write_1(SH3_RYRCNT, year);
else
_reg_write_2(SH4_RYRCNT, year);
#define RTCSET(x, y) \
_reg_write_1(SH_(R ## x ## CNT), bintobcd(dt->dt_ ## y))
RTCSET(MON, mon);
RTCSET(WK, wday);
RTCSET(DAY, day);
RTCSET(HR, hour);
RTCSET(MIN, min);
RTCSET(SEC, sec);
#undef RTCSET
/* start clock */
_reg_write_1(SH_(RCR2), r);
sc->sc_valid = 1;
#ifdef RTC_DEBUG
aprint_debug_dev(sc->sc_dev,
"settime: %04lu-%02d-%02d %02d:%02d:%02d\n",
(unsigned long)dt->dt_year, dt->dt_mon, dt->dt_day,
dt->dt_hour, dt->dt_min, dt->dt_sec);
#endif
return 0;
}