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/* $OpenBSD: exrtc.c,v 1.5 2022/10/17 19:09:46 kettenis Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/time.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/clock_subr.h>
#define RTCCTRL 0x40
#define RTCCTRL_RTCEN (1 << 0)
#define RTCSEC 0x70
#define RTCMIN 0x74
#define RTCHOUR 0x78
#define RTCDAY 0x7c
#define RTCMON 0x84
#define RTCYEAR 0x88
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
struct exrtc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct todr_chip_handle sc_todr;
};
int exrtc_match(struct device *, void *, void *);
void exrtc_attach(struct device *, struct device *, void *);
const struct cfattach exrtc_ca = {
sizeof(struct exrtc_softc), exrtc_match, exrtc_attach
};
struct cfdriver exrtc_cd = {
NULL, "exrtc", DV_DULL
};
int exrtc_gettime(todr_chip_handle_t, struct timeval *);
int exrtc_settime(todr_chip_handle_t, struct timeval *);
int
exrtc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "samsung,s3c6410-rtc");
}
void
exrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct exrtc_softc *sc = (struct exrtc_softc *)self;
struct fdt_attach_args *faa = aux;
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh))
panic("%s: bus_space_map failed!", __func__);
printf("\n");
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = exrtc_gettime;
sc->sc_todr.todr_settime = exrtc_settime;
sc->sc_todr.todr_quality = 0;
todr_attach(&sc->sc_todr);
}
int
exrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
{
struct exrtc_softc *sc = handle->cookie;
struct clock_ymdhms dt;
int retried = 0;
retry:
dt.dt_sec = FROMBCD(HREAD4(sc, RTCSEC));
dt.dt_min = FROMBCD(HREAD4(sc, RTCMIN));
dt.dt_hour = FROMBCD(HREAD4(sc, RTCHOUR));
dt.dt_day = FROMBCD(HREAD4(sc, RTCDAY));
dt.dt_mon = FROMBCD(HREAD4(sc, RTCMON));
dt.dt_year = FROMBCD(HREAD4(sc, RTCYEAR)) + 1900;
/* If the second counter rolled over, retry. */
if (dt.dt_sec > FROMBCD(HREAD4(sc, RTCSEC)) && !retried) {
retried = 1;
goto retry;
}
if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 ||
dt.dt_day > 31 || dt.dt_day == 0 ||
dt.dt_mon > 12 || dt.dt_mon == 0 ||
dt.dt_year < POSIX_BASE_YEAR)
return 1;
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return 0;
}
int
exrtc_settime(todr_chip_handle_t handle, struct timeval *tv)
{
struct exrtc_softc *sc = handle->cookie;
struct clock_ymdhms dt;
uint32_t val;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
HWRITE4(sc, RTCSEC, TOBCD(dt.dt_sec));
HWRITE4(sc, RTCMIN, TOBCD(dt.dt_min));
HWRITE4(sc, RTCHOUR, TOBCD(dt.dt_hour));
HWRITE4(sc, RTCDAY, TOBCD(dt.dt_day));
HWRITE4(sc, RTCMON, TOBCD(dt.dt_mon));
HWRITE4(sc, RTCYEAR, TOBCD(dt.dt_year - 1900));
val = HREAD4(sc, RTCCTRL);
HWRITE4(sc, RTCCTRL, val | RTCCTRL_RTCEN);
return 0;
}
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