412 lines
10 KiB
C
412 lines
10 KiB
C
|
/*-
|
||
|
* Copyright (c) 2015 Luiz Otavio O Souza <loos@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, 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("$FreeBSD$");
|
||
|
|
||
|
/*
|
||
|
* Driver for Maxim DS1307 I2C real-time clock/calendar.
|
||
|
*/
|
||
|
|
||
|
#include "opt_platform.h"
|
||
|
|
||
|
#include <sys/param.h>
|
||
|
#include <sys/systm.h>
|
||
|
#include <sys/bus.h>
|
||
|
#include <sys/clock.h>
|
||
|
#include <sys/kernel.h>
|
||
|
#include <sys/module.h>
|
||
|
#include <sys/sysctl.h>
|
||
|
|
||
|
#include <dev/iicbus/iicbus.h>
|
||
|
#include <dev/iicbus/iiconf.h>
|
||
|
#ifdef FDT
|
||
|
#include <dev/ofw/openfirm.h>
|
||
|
#include <dev/ofw/ofw_bus.h>
|
||
|
#include <dev/ofw/ofw_bus_subr.h>
|
||
|
#endif
|
||
|
|
||
|
#include <dev/iicbus/ds1307reg.h>
|
||
|
|
||
|
#include "clock_if.h"
|
||
|
#include "iicbus_if.h"
|
||
|
|
||
|
struct ds1307_softc {
|
||
|
device_t sc_dev;
|
||
|
int sc_year0;
|
||
|
struct intr_config_hook enum_hook;
|
||
|
uint16_t sc_addr; /* DS1307 slave address. */
|
||
|
uint8_t sc_ctrl;
|
||
|
};
|
||
|
|
||
|
static void ds1307_start(void *);
|
||
|
|
||
|
static int
|
||
|
ds1307_read(device_t dev, uint16_t addr, uint8_t reg, uint8_t *data, size_t len)
|
||
|
{
|
||
|
struct iic_msg msg[2] = {
|
||
|
{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
|
||
|
{ addr, IIC_M_RD, len, data },
|
||
|
};
|
||
|
|
||
|
return (iicbus_transfer(dev, msg, nitems(msg)));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_write(device_t dev, uint16_t addr, uint8_t *data, size_t len)
|
||
|
{
|
||
|
struct iic_msg msg[1] = {
|
||
|
{ addr, IIC_M_WR, len, data },
|
||
|
};
|
||
|
|
||
|
return (iicbus_transfer(dev, msg, nitems(msg)));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_ctrl_read(struct ds1307_softc *sc)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
sc->sc_ctrl = 0;
|
||
|
error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_CONTROL,
|
||
|
&sc->sc_ctrl, sizeof(sc->sc_ctrl));
|
||
|
if (error) {
|
||
|
device_printf(sc->sc_dev, "cannot read from RTC.\n");
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_ctrl_write(struct ds1307_softc *sc)
|
||
|
{
|
||
|
int error;
|
||
|
uint8_t data[2];
|
||
|
|
||
|
data[0] = DS1307_CONTROL;
|
||
|
data[1] = sc->sc_ctrl & DS1307_CTRL_MASK;
|
||
|
error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
|
||
|
if (error != 0)
|
||
|
device_printf(sc->sc_dev, "cannot write to RTC.\n");
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_osc_enable(struct ds1307_softc *sc)
|
||
|
{
|
||
|
int error;
|
||
|
uint8_t data[2], secs;
|
||
|
|
||
|
secs = 0;
|
||
|
error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS,
|
||
|
&secs, sizeof(secs));
|
||
|
if (error) {
|
||
|
device_printf(sc->sc_dev, "cannot read from RTC.\n");
|
||
|
return (error);
|
||
|
}
|
||
|
/* Check if the oscillator is disabled. */
|
||
|
if ((secs & DS1307_SECS_CH) == 0)
|
||
|
return (0);
|
||
|
device_printf(sc->sc_dev, "clock was halted, check the battery.\n");
|
||
|
data[0] = DS1307_SECS;
|
||
|
data[1] = secs & DS1307_SECS_MASK;
|
||
|
error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
|
||
|
if (error != 0)
|
||
|
device_printf(sc->sc_dev, "cannot write to RTC.\n");
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_set_24hrs_mode(struct ds1307_softc *sc)
|
||
|
{
|
||
|
int error;
|
||
|
uint8_t data[2], hour;
|
||
|
|
||
|
hour = 0;
|
||
|
error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_HOUR,
|
||
|
&hour, sizeof(hour));
|
||
|
if (error) {
|
||
|
device_printf(sc->sc_dev, "cannot read from RTC.\n");
|
||
|
return (error);
|
||
|
}
|
||
|
data[0] = DS1307_HOUR;
|
||
|
data[1] = hour & DS1307_HOUR_MASK;
|
||
|
error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
|
||
|
if (error != 0)
|
||
|
device_printf(sc->sc_dev, "cannot write to RTC.\n");
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_sqwe_sysctl(SYSCTL_HANDLER_ARGS)
|
||
|
{
|
||
|
int sqwe, error, newv;
|
||
|
struct ds1307_softc *sc;
|
||
|
|
||
|
sc = (struct ds1307_softc *)arg1;
|
||
|
error = ds1307_ctrl_read(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
sqwe = newv = (sc->sc_ctrl & DS1307_CTRL_SQWE) ? 1 : 0;
|
||
|
error = sysctl_handle_int(oidp, &newv, 0, req);
|
||
|
if (error != 0 || req->newptr == NULL)
|
||
|
return (error);
|
||
|
if (sqwe != newv) {
|
||
|
sc->sc_ctrl &= ~DS1307_CTRL_SQWE;
|
||
|
if (newv)
|
||
|
sc->sc_ctrl |= DS1307_CTRL_SQWE;
|
||
|
error = ds1307_ctrl_write(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_sqw_freq_sysctl(SYSCTL_HANDLER_ARGS)
|
||
|
{
|
||
|
int ds1307_sqw_freq[] = { 1, 4096, 8192, 32768 };
|
||
|
int error, freq, i, newf, tmp;
|
||
|
struct ds1307_softc *sc;
|
||
|
|
||
|
sc = (struct ds1307_softc *)arg1;
|
||
|
error = ds1307_ctrl_read(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
tmp = (sc->sc_ctrl & DS1307_CTRL_RS_MASK);
|
||
|
if (tmp >= nitems(ds1307_sqw_freq))
|
||
|
tmp = nitems(ds1307_sqw_freq) - 1;
|
||
|
freq = ds1307_sqw_freq[tmp];
|
||
|
error = sysctl_handle_int(oidp, &freq, 0, req);
|
||
|
if (error != 0 || req->newptr == NULL)
|
||
|
return (error);
|
||
|
if (freq != ds1307_sqw_freq[tmp]) {
|
||
|
newf = 0;
|
||
|
for (i = 0; i < nitems(ds1307_sqw_freq); i++)
|
||
|
if (freq >= ds1307_sqw_freq[i])
|
||
|
newf = i;
|
||
|
sc->sc_ctrl &= ~DS1307_CTRL_RS_MASK;
|
||
|
sc->sc_ctrl |= newf;
|
||
|
error = ds1307_ctrl_write(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_sqw_out_sysctl(SYSCTL_HANDLER_ARGS)
|
||
|
{
|
||
|
int sqwe, error, newv;
|
||
|
struct ds1307_softc *sc;
|
||
|
|
||
|
sc = (struct ds1307_softc *)arg1;
|
||
|
error = ds1307_ctrl_read(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
sqwe = newv = (sc->sc_ctrl & DS1307_CTRL_OUT) ? 1 : 0;
|
||
|
error = sysctl_handle_int(oidp, &newv, 0, req);
|
||
|
if (error != 0 || req->newptr == NULL)
|
||
|
return (error);
|
||
|
if (sqwe != newv) {
|
||
|
sc->sc_ctrl &= ~DS1307_CTRL_OUT;
|
||
|
if (newv)
|
||
|
sc->sc_ctrl |= DS1307_CTRL_OUT;
|
||
|
error = ds1307_ctrl_write(sc);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_probe(device_t dev)
|
||
|
{
|
||
|
|
||
|
#ifdef FDT
|
||
|
if (!ofw_bus_status_okay(dev))
|
||
|
return (ENXIO);
|
||
|
if (!ofw_bus_is_compatible(dev, "dallas,ds1307") &&
|
||
|
!ofw_bus_is_compatible(dev, "maxim,ds1307"))
|
||
|
return (ENXIO);
|
||
|
#endif
|
||
|
device_set_desc(dev, "Maxim DS1307 RTC");
|
||
|
|
||
|
return (BUS_PROBE_DEFAULT);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_attach(device_t dev)
|
||
|
{
|
||
|
struct ds1307_softc *sc;
|
||
|
|
||
|
sc = device_get_softc(dev);
|
||
|
sc->sc_dev = dev;
|
||
|
sc->sc_addr = iicbus_get_addr(dev);
|
||
|
sc->sc_year0 = 1900;
|
||
|
sc->enum_hook.ich_func = ds1307_start;
|
||
|
sc->enum_hook.ich_arg = dev;
|
||
|
|
||
|
/*
|
||
|
* We have to wait until interrupts are enabled. Usually I2C read
|
||
|
* and write only works when the interrupts are available.
|
||
|
*/
|
||
|
if (config_intrhook_establish(&sc->enum_hook) != 0)
|
||
|
return (ENOMEM);
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
ds1307_start(void *xdev)
|
||
|
{
|
||
|
device_t dev;
|
||
|
struct ds1307_softc *sc;
|
||
|
struct sysctl_ctx_list *ctx;
|
||
|
struct sysctl_oid *tree_node;
|
||
|
struct sysctl_oid_list *tree;
|
||
|
|
||
|
dev = (device_t)xdev;
|
||
|
sc = device_get_softc(dev);
|
||
|
ctx = device_get_sysctl_ctx(dev);
|
||
|
tree_node = device_get_sysctl_tree(dev);
|
||
|
tree = SYSCTL_CHILDREN(tree_node);
|
||
|
|
||
|
config_intrhook_disestablish(&sc->enum_hook);
|
||
|
/* Set the 24 hours mode. */
|
||
|
if (ds1307_set_24hrs_mode(sc) != 0)
|
||
|
return;
|
||
|
/* Enable the oscillator if halted. */
|
||
|
if (ds1307_osc_enable(sc) != 0)
|
||
|
return;
|
||
|
|
||
|
/* Configuration parameters. */
|
||
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqwe",
|
||
|
CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
|
||
|
ds1307_sqwe_sysctl, "IU", "DS1307 square-wave enable");
|
||
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqw_freq",
|
||
|
CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
|
||
|
ds1307_sqw_freq_sysctl, "IU",
|
||
|
"DS1307 square-wave output frequency");
|
||
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqw_out",
|
||
|
CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
|
||
|
ds1307_sqw_out_sysctl, "IU", "DS1307 square-wave output state");
|
||
|
|
||
|
/* 1 second resolution. */
|
||
|
clock_register(dev, 1000000);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_gettime(device_t dev, struct timespec *ts)
|
||
|
{
|
||
|
int error;
|
||
|
struct clocktime ct;
|
||
|
struct ds1307_softc *sc;
|
||
|
uint8_t data[7];
|
||
|
|
||
|
sc = device_get_softc(dev);
|
||
|
memset(data, 0, sizeof(data));
|
||
|
error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS,
|
||
|
data, sizeof(data));
|
||
|
if (error != 0) {
|
||
|
device_printf(dev, "cannot read from RTC.\n");
|
||
|
return (error);
|
||
|
}
|
||
|
ct.nsec = 0;
|
||
|
ct.sec = FROMBCD(data[DS1307_SECS] & DS1307_SECS_MASK);
|
||
|
ct.min = FROMBCD(data[DS1307_MINS] & DS1307_MINS_MASK);
|
||
|
ct.hour = FROMBCD(data[DS1307_HOUR] & DS1307_HOUR_MASK);
|
||
|
ct.day = FROMBCD(data[DS1307_DATE] & DS1307_DATE_MASK);
|
||
|
ct.dow = data[DS1307_WEEKDAY] & DS1307_WEEKDAY_MASK;
|
||
|
ct.mon = FROMBCD(data[DS1307_MONTH] & DS1307_MONTH_MASK);
|
||
|
ct.year = FROMBCD(data[DS1307_YEAR] & DS1307_YEAR_MASK);
|
||
|
ct.year += sc->sc_year0;
|
||
|
if (ct.year < POSIX_BASE_YEAR)
|
||
|
ct.year += 100; /* assume [1970, 2069] */
|
||
|
|
||
|
return (clock_ct_to_ts(&ct, ts));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ds1307_settime(device_t dev, struct timespec *ts)
|
||
|
{
|
||
|
int error;
|
||
|
struct clocktime ct;
|
||
|
struct ds1307_softc *sc;
|
||
|
uint8_t data[8];
|
||
|
|
||
|
sc = device_get_softc(dev);
|
||
|
/* Accuracy is only one second. */
|
||
|
if (ts->tv_nsec >= 500000000)
|
||
|
ts->tv_sec++;
|
||
|
ts->tv_nsec = 0;
|
||
|
clock_ts_to_ct(ts, &ct);
|
||
|
memset(data, 0, sizeof(data));
|
||
|
data[0] = DS1307_SECS;
|
||
|
data[DS1307_SECS + 1] = TOBCD(ct.sec);
|
||
|
data[DS1307_MINS + 1] = TOBCD(ct.min);
|
||
|
data[DS1307_HOUR + 1] = TOBCD(ct.hour);
|
||
|
data[DS1307_DATE + 1] = TOBCD(ct.day);
|
||
|
data[DS1307_WEEKDAY + 1] = ct.dow;
|
||
|
data[DS1307_MONTH + 1] = TOBCD(ct.mon);
|
||
|
data[DS1307_YEAR + 1] = TOBCD(ct.year % 100);
|
||
|
/* Write the time back to RTC. */
|
||
|
error = ds1307_write(dev, sc->sc_addr, data, sizeof(data));
|
||
|
if (error != 0)
|
||
|
device_printf(dev, "cannot write to RTC.\n");
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static device_method_t ds1307_methods[] = {
|
||
|
DEVMETHOD(device_probe, ds1307_probe),
|
||
|
DEVMETHOD(device_attach, ds1307_attach),
|
||
|
|
||
|
DEVMETHOD(clock_gettime, ds1307_gettime),
|
||
|
DEVMETHOD(clock_settime, ds1307_settime),
|
||
|
|
||
|
DEVMETHOD_END
|
||
|
};
|
||
|
|
||
|
static driver_t ds1307_driver = {
|
||
|
"ds1307",
|
||
|
ds1307_methods,
|
||
|
sizeof(struct ds1307_softc),
|
||
|
};
|
||
|
|
||
|
static devclass_t ds1307_devclass;
|
||
|
|
||
|
DRIVER_MODULE(ds1307, iicbus, ds1307_driver, ds1307_devclass, NULL, NULL);
|
||
|
MODULE_VERSION(ds1307, 1);
|
||
|
MODULE_DEPEND(ds1307, iicbus, 1, 1, 1);
|