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/*-
* Copyright (c) 2003-2012 Broadcom Corporation
* All Rights Reserved
*
* 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 BROADCOM ``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 BROADCOM 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include "iicbus_if.h"
#include "clock_if.h"
#define DS1374_RTC_COUNTER 0 /* counter (bytes 0-3) */
struct ds1374_softc {
uint32_t sc_addr;
device_t sc_dev;
};
static int
ds1374_probe(device_t dev)
{
device_set_desc(dev, "DS1374 RTC");
return (0);
}
static int
ds1374_attach(device_t dev)
{
struct ds1374_softc *sc = device_get_softc(dev);
if(sc==NULL) {
printf("ds1374_attach device_get_softc failed\n");
return (0);
}
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
clock_register(dev, 1000);
return (0);
}
static int
ds1374_settime(device_t dev, struct timespec *ts)
{
/* NB: register pointer precedes actual data */
uint8_t data[5] = { DS1374_RTC_COUNTER };
struct ds1374_softc *sc = device_get_softc(dev);
struct iic_msg msgs[1] = {
{ sc->sc_addr, IIC_M_WR, 5, data },
};
data[1] = (ts->tv_sec >> 0) & 0xff;
data[2] = (ts->tv_sec >> 8) & 0xff;
data[3] = (ts->tv_sec >> 16) & 0xff;
data[4] = (ts->tv_sec >> 24) & 0xff;
return iicbus_transfer(dev, msgs, 1);
}
static int
ds1374_gettime(device_t dev, struct timespec *ts)
{
struct ds1374_softc *sc = device_get_softc(dev);
uint8_t addr[1] = { DS1374_RTC_COUNTER };
uint8_t secs[4];
struct iic_msg msgs[2] = {
{ sc->sc_addr, IIC_M_WR, 1, addr },
{ sc->sc_addr, IIC_M_RD, 4, secs },
};
int error;
error = iicbus_transfer(dev, msgs, 2);
if (error == 0) {
/* counter has seconds since epoch */
ts->tv_sec = (secs[3] << 24) | (secs[2] << 16)
| (secs[1] << 8) | (secs[0] << 0);
ts->tv_nsec = 0;
}
return error;
}
static device_method_t ds1374_methods[] = {
DEVMETHOD(device_probe, ds1374_probe),
DEVMETHOD(device_attach, ds1374_attach),
DEVMETHOD(clock_gettime, ds1374_gettime),
DEVMETHOD(clock_settime, ds1374_settime),
DEVMETHOD_END
};
static driver_t ds1374_driver = {
"ds1374_rtc",
ds1374_methods,
sizeof(struct ds1374_softc),
};
static devclass_t ds1374_devclass;
DRIVER_MODULE(ds1374, iicbus, ds1374_driver, ds1374_devclass, 0, 0);
MODULE_VERSION(ds1374, 1);
MODULE_DEPEND(ds1374, iicbus, 1, 1, 1);
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