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/* $OpenBSD: m41t8xclock.c,v 1.2 2010/02/24 22:14:19 miod Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* 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.
*/
/*
* M41T8x clock connected to an I2C bus
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ic/m41t8xreg.h>
#include <mips64/dev/clockvar.h>
struct m41t8xclock_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
};
int m41t8xclock_match(struct device *, void *, void *);
void m41t8xclock_attach(struct device *, struct device *, void *);
const struct cfattach mfokclock_ca = {
sizeof(struct m41t8xclock_softc),
m41t8xclock_match, m41t8xclock_attach
};
struct cfdriver mfokclock_cd = {
NULL, "mfokclock", DV_DULL
};
void m41t8xclock_get(void *, time_t, struct tod_time *);
void m41t8xclock_set(void *, struct tod_time *);
int
m41t8xclock_match(struct device *parent, void *vcf, void *aux)
{
struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
struct cfdata *cf = (struct cfdata *)vcf;
return strcmp(ia->ia_name, cf->cf_driver->cd_name) == 0;
}
void
m41t8xclock_attach(struct device *parent, struct device *self, void *aux)
{
struct m41t8xclock_softc *sc = (struct m41t8xclock_softc *)self;
struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sys_tod.tod_cookie = sc;
sys_tod.tod_get = m41t8xclock_get;
sys_tod.tod_set = m41t8xclock_set;
printf("\n");
}
static inline int bcd2bin(int);
static inline int
bcd2bin(int datum)
{
return (datum >> 4) * 10 + (datum & 0x0f);
}
static inline int bin2bcd(int);
static inline int
bin2bcd(int datum)
{
return ((datum / 10) << 4) + (datum % 10);
}
void
m41t8xclock_get(void *cookie, time_t unused, struct tod_time *tt)
{
struct m41t8xclock_softc *sc = (struct m41t8xclock_softc *)cookie;
uint8_t regno, data[M41T8X_TOD_LENGTH];
int s;
iic_acquire_bus(sc->sc_tag, 0);
s = splclock();
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno - M41T8X_TOD_START,
sizeof data[0], 0);
splx(s);
iic_release_bus(sc->sc_tag, 0);
tt->sec = bcd2bin(data[M41T8X_SEC] & ~M41T8X_STOP);
tt->min = bcd2bin(data[M41T8X_MIN]);
tt->hour = bcd2bin(data[M41T8X_HR] & ~(M41T8X_CEB | M41T8X_CB));
tt->dow = data[M41T8X_DOW];
tt->day = bcd2bin(data[M41T8X_DAY]);
tt->mon = bcd2bin(data[M41T8X_MON]);
tt->year = bcd2bin(data[M41T8X_YEAR]) + 100;
if (data[M41T8X_HR] & M41T8X_CB)
tt->year += 100;
}
void
m41t8xclock_set(void *cookie, struct tod_time *tt)
{
struct m41t8xclock_softc *sc = (struct m41t8xclock_softc *)cookie;
uint8_t regno, data[M41T8X_TOD_LENGTH];
int s;
iic_acquire_bus(sc->sc_tag, 0);
s = splclock();
/* read current state */
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno - M41T8X_TOD_START,
sizeof data[0], 0);
/* compute new state */
data[M41T8X_HSEC] = 0;
data[M41T8X_SEC] = bin2bcd(tt->sec);
data[M41T8X_MIN] = bin2bcd(tt->min);
data[M41T8X_HR] &= M41T8X_CEB;
if (tt->year >= 200)
data[M41T8X_HR] |= M41T8X_CB;
data[M41T8X_HR] |= bin2bcd(tt->hour);
data[M41T8X_DAY] = bin2bcd(tt->day);
data[M41T8X_MON] = bin2bcd(tt->mon);
if (tt->year >= 200)
data[M41T8X_YEAR] = bin2bcd(tt->year - 200);
else
data[M41T8X_YEAR] = bin2bcd(tt->year - 100);
/* write new state */
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno, sizeof data[0], 0);
splx(s);
iic_release_bus(sc->sc_tag, 0);
}
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