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/*-
* Copyright (c) 2010, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
* 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 unmodified, 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 AUTHOR 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 AUTHOR 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/bus.h>
#include <sys/lock.h>
#include <sys/time.h>
#include <sys/clock.h>
#include <sys/resource.h>
#include <sys/systm.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <mips/atheros/pcf2123reg.h>
#include <dev/spibus/spi.h>
#include "spibus_if.h"
#include "clock_if.h"
#define YEAR_BASE 1970
#define PCF2123_DELAY 50
struct pcf2123_rtc_softc {
device_t dev;
};
static int pcf2123_rtc_probe(device_t dev);
static int pcf2123_rtc_attach(device_t dev);
static int pcf2123_rtc_gettime(device_t dev, struct timespec *ts);
static int pcf2123_rtc_settime(device_t dev, struct timespec *ts);
static int
pcf2123_rtc_probe(device_t dev)
{
device_set_desc(dev, "PCF2123 SPI RTC");
return (0);
}
static int
pcf2123_rtc_attach(device_t dev)
{
struct pcf2123_rtc_softc *sc;
struct spi_command cmd;
unsigned char rxBuf[3];
unsigned char txBuf[3];
int err;
sc = device_get_softc(dev);
sc->dev = dev;
clock_register(dev, 1000000);
memset(&cmd, 0, sizeof(cmd));
memset(rxBuf, 0, sizeof(rxBuf));
memset(txBuf, 0, sizeof(txBuf));
/* Make sure Ctrl1 and Ctrl2 are zeroes */
txBuf[0] = PCF2123_WRITE(PCF2123_REG_CTRL1);
cmd.rx_cmd = rxBuf;
cmd.tx_cmd = txBuf;
cmd.rx_cmd_sz = sizeof(rxBuf);
cmd.tx_cmd_sz = sizeof(txBuf);
err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
DELAY(PCF2123_DELAY);
return (0);
}
static int
pcf2123_rtc_gettime(device_t dev, struct timespec *ts)
{
struct clocktime ct;
struct spi_command cmd;
unsigned char rxTimedate[8];
unsigned char txTimedate[8];
int err;
memset(&cmd, 0, sizeof(cmd));
memset(rxTimedate, 0, sizeof(rxTimedate));
memset(txTimedate, 0, sizeof(txTimedate));
/*
* Counter is stopped when access to time registers is in progress
* So there is no need to stop/start counter
*/
/* Start reading from seconds */
txTimedate[0] = PCF2123_READ(PCF2123_REG_SECONDS);
cmd.rx_cmd = rxTimedate;
cmd.tx_cmd = txTimedate;
cmd.rx_cmd_sz = sizeof(rxTimedate);
cmd.tx_cmd_sz = sizeof(txTimedate);
err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
DELAY(PCF2123_DELAY);
ct.nsec = 0;
ct.sec = FROMBCD(rxTimedate[1] & 0x7f);
ct.min = FROMBCD(rxTimedate[2] & 0x7f);
ct.hour = FROMBCD(rxTimedate[3] & 0x3f);
ct.dow = FROMBCD(rxTimedate[5] & 0x3f);
ct.day = FROMBCD(rxTimedate[4] & 0x3f);
ct.mon = FROMBCD(rxTimedate[6] & 0x1f);
ct.year = YEAR_BASE + FROMBCD(rxTimedate[7]);
return (clock_ct_to_ts(&ct, ts));
}
static int
pcf2123_rtc_settime(device_t dev, struct timespec *ts)
{
struct clocktime ct;
struct pcf2123_rtc_softc *sc;
struct spi_command cmd;
unsigned char rxTimedate[8];
unsigned char txTimedate[8];
int err;
sc = device_get_softc(dev);
/* Resolution: 1 sec */
if (ts->tv_nsec >= 500000000)
ts->tv_sec++;
ts->tv_nsec = 0;
clock_ts_to_ct(ts, &ct);
memset(&cmd, 0, sizeof(cmd));
memset(rxTimedate, 0, sizeof(rxTimedate));
memset(txTimedate, 0, sizeof(txTimedate));
/* Start reading from seconds */
cmd.rx_cmd = rxTimedate;
cmd.tx_cmd = txTimedate;
cmd.rx_cmd_sz = sizeof(rxTimedate);
cmd.tx_cmd_sz = sizeof(txTimedate);
/*
* Counter is stopped when access to time registers is in progress
* So there is no need to stop/start counter
*/
txTimedate[0] = PCF2123_WRITE(PCF2123_REG_SECONDS);
txTimedate[1] = TOBCD(ct.sec);
txTimedate[2] = TOBCD(ct.min);
txTimedate[3] = TOBCD(ct.hour);
txTimedate[4] = TOBCD(ct.day);
txTimedate[5] = TOBCD(ct.dow);
txTimedate[6] = TOBCD(ct.mon);
txTimedate[7] = TOBCD(ct.year - YEAR_BASE);
err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
DELAY(PCF2123_DELAY);
return (err);
}
static device_method_t pcf2123_rtc_methods[] = {
DEVMETHOD(device_probe, pcf2123_rtc_probe),
DEVMETHOD(device_attach, pcf2123_rtc_attach),
DEVMETHOD(clock_gettime, pcf2123_rtc_gettime),
DEVMETHOD(clock_settime, pcf2123_rtc_settime),
{ 0, 0 },
};
static driver_t pcf2123_rtc_driver = {
"rtc",
pcf2123_rtc_methods,
sizeof(struct pcf2123_rtc_softc),
};
static devclass_t pcf2123_rtc_devclass;
DRIVER_MODULE(pcf2123_rtc, spibus, pcf2123_rtc_driver, pcf2123_rtc_devclass, 0, 0);
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