e2040cb270
controllers. Call iicbus_transfer() from the device context and not from the iicbus context. I am committing a slightly different patch, so if something break, it is probably my fault. PR: 199496 Submitted by: Juraj Lutter <otis@sk.FreeBSD.org>
248 lines
7.2 KiB
C
248 lines
7.2 KiB
C
/*-
|
|
* Copyright (c) 2012 Marius Strobl <marius@FreeBSD.org>
|
|
* Copyright (c) 2015 Juraj Lutter
|
|
* 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 NXP PCF8563 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 <dev/iicbus/iicbus.h>
|
|
#include <dev/iicbus/iiconf.h>
|
|
#include <dev/iicbus/pcf8563reg.h>
|
|
#ifdef FDT
|
|
#include <dev/ofw/openfirm.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
#endif
|
|
|
|
#include "clock_if.h"
|
|
#include "iicbus_if.h"
|
|
|
|
#define PCF8563_NCLOCKREGS (PCF8563_R_YEAR - PCF8563_R_CS1 + 1)
|
|
|
|
struct pcf8563_softc {
|
|
struct intr_config_hook enum_hook;
|
|
uint32_t sc_flags;
|
|
#define PCF8563_CPOL (1 << 0) /* PCF8563_R_MONTH_C means 19xx */
|
|
uint16_t sc_addr; /* PCF8563 slave address */
|
|
uint16_t sc_year0; /* TOD clock year 0 */
|
|
};
|
|
|
|
static device_attach_t pcf8563_attach;
|
|
static device_probe_t pcf8563_probe;
|
|
static clock_gettime_t pcf8563_gettime;
|
|
static clock_settime_t pcf8563_settime;
|
|
static void pcf8563_start(void *);
|
|
|
|
static int
|
|
pcf8563_probe(device_t dev)
|
|
{
|
|
|
|
#ifdef FDT
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
if (!ofw_bus_is_compatible(dev, "nxp,pcf8563") &&
|
|
!ofw_bus_is_compatible(dev, "philips,pcf8563") &&
|
|
!ofw_bus_is_compatible(dev, "pcf8563"))
|
|
return (ENXIO);
|
|
#endif
|
|
device_set_desc(dev, "NXP PCF8563 RTC");
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
pcf8563_attach(device_t dev)
|
|
{
|
|
struct pcf8563_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_addr = iicbus_get_addr(dev);
|
|
if (sc->sc_addr == 0)
|
|
sc->sc_addr = PCF8563_ADDR;
|
|
sc->sc_year0 = 1900;
|
|
sc->enum_hook.ich_func = pcf8563_start;
|
|
sc->enum_hook.ich_arg = dev;
|
|
|
|
/*
|
|
* We have to wait until interrupts are enabled. Sometimes 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
|
|
pcf8563_start(void *xdev)
|
|
{
|
|
device_t dev;
|
|
uint8_t reg = PCF8563_R_SECOND, val;
|
|
struct iic_msg msgs[] = {
|
|
{ 0, IIC_M_WR, sizeof(reg), ® },
|
|
{ 0, IIC_M_RD, sizeof(val), &val }
|
|
};
|
|
struct pcf8563_softc *sc;
|
|
|
|
dev = (device_t)xdev;
|
|
sc = device_get_softc(dev);
|
|
config_intrhook_disestablish(&sc->enum_hook);
|
|
|
|
/*
|
|
* NB: PCF8563_R_SECOND_VL doesn't automatically clear when VDD
|
|
* rises above Vlow again and needs to be cleared manually.
|
|
* However, apparently this needs all of the time registers to be
|
|
* set, i.e. pcf8563_settime(), and not just PCF8563_R_SECOND in
|
|
* order for PCF8563_R_SECOND_VL to stick. Thus, we just issue a
|
|
* warning here rather than failing with ENXIO in case it is set.
|
|
* Note that pcf8563_settime() will also clear PCF8563_R_SECOND_VL
|
|
* as a side-effect.
|
|
*/
|
|
msgs[0].slave = msgs[1].slave = sc->sc_addr;
|
|
if (iicbus_transfer(dev, msgs, nitems(msgs)) != 0) {
|
|
device_printf(dev, "%s: cannot read RTC\n", __func__);
|
|
return;
|
|
}
|
|
if ((val & PCF8563_R_SECOND_VL) != 0)
|
|
device_printf(dev, "%s: battery low\n", __func__);
|
|
|
|
clock_register(dev, 1000000); /* 1 second resolution */
|
|
}
|
|
|
|
static int
|
|
pcf8563_gettime(device_t dev, struct timespec *ts)
|
|
{
|
|
struct clocktime ct;
|
|
uint8_t reg = PCF8563_R_SECOND, val[PCF8563_NCLOCKREGS];
|
|
struct iic_msg msgs[] = {
|
|
{ 0, IIC_M_WR, sizeof(reg), ® },
|
|
{ 0, IIC_M_RD, PCF8563_NCLOCKREGS, &val[PCF8563_R_SECOND] }
|
|
};
|
|
struct pcf8563_softc *sc;
|
|
int error;
|
|
|
|
sc = device_get_softc(dev);
|
|
msgs[0].slave = msgs[1].slave = sc->sc_addr;
|
|
error = iicbus_transfer(dev, msgs, nitems(msgs));
|
|
if (error != 0) {
|
|
device_printf(dev, "%s: cannot read RTC\n", __func__);
|
|
return (error);
|
|
}
|
|
|
|
ct.nsec = 0;
|
|
ct.sec = FROMBCD(val[PCF8563_R_SECOND] & PCF8563_M_SECOND);
|
|
ct.min = FROMBCD(val[PCF8563_R_MINUTE] & PCF8563_M_MINUTE);
|
|
ct.hour = FROMBCD(val[PCF8563_R_HOUR] & PCF8563_M_HOUR);
|
|
ct.day = FROMBCD(val[PCF8563_R_DAY] & PCF8563_M_DAY);
|
|
ct.dow = val[PCF8563_R_WEEKDAY] & PCF8563_M_WEEKDAY;
|
|
ct.mon = FROMBCD(val[PCF8563_R_MONTH] & PCF8563_M_MONTH);
|
|
ct.year = FROMBCD(val[PCF8563_R_YEAR] & PCF8563_M_YEAR);
|
|
ct.year += sc->sc_year0;
|
|
if (ct.year < POSIX_BASE_YEAR)
|
|
ct.year += 100; /* assume [1970, 2069] */
|
|
if ((val[PCF8563_R_MONTH] & PCF8563_R_MONTH_C) != 0) {
|
|
if (ct.year >= 100 + sc->sc_year0)
|
|
sc->sc_flags |= PCF8563_CPOL;
|
|
} else if (ct.year < 100 + sc->sc_year0)
|
|
sc->sc_flags |= PCF8563_CPOL;
|
|
|
|
return (clock_ct_to_ts(&ct, ts));
|
|
}
|
|
|
|
static int
|
|
pcf8563_settime(device_t dev, struct timespec *ts)
|
|
{
|
|
struct clocktime ct;
|
|
uint8_t val[PCF8563_NCLOCKREGS];
|
|
struct iic_msg msgs[] = {
|
|
{ 0, IIC_M_WR, PCF8563_NCLOCKREGS - 1, &val[PCF8563_R_CS2] }
|
|
};
|
|
struct pcf8563_softc *sc;
|
|
int error;
|
|
|
|
sc = device_get_softc(dev);
|
|
val[PCF8563_R_CS2] = PCF8563_R_SECOND; /* abuse */
|
|
/* Accuracy is only one second. */
|
|
if (ts->tv_nsec >= 500000000)
|
|
ts->tv_sec++;
|
|
ts->tv_nsec = 0;
|
|
clock_ts_to_ct(ts, &ct);
|
|
val[PCF8563_R_SECOND] = TOBCD(ct.sec);
|
|
val[PCF8563_R_MINUTE] = TOBCD(ct.min);
|
|
val[PCF8563_R_HOUR] = TOBCD(ct.hour);
|
|
val[PCF8563_R_DAY] = TOBCD(ct.day);
|
|
val[PCF8563_R_WEEKDAY] = ct.dow;
|
|
val[PCF8563_R_MONTH] = TOBCD(ct.mon);
|
|
val[PCF8563_R_YEAR] = TOBCD(ct.year % 100);
|
|
if ((sc->sc_flags & PCF8563_CPOL) != 0) {
|
|
if (ct.year >= 100 + sc->sc_year0)
|
|
val[PCF8563_R_MONTH] |= PCF8563_R_MONTH_C;
|
|
} else if (ct.year < 100 + sc->sc_year0)
|
|
val[PCF8563_R_MONTH] |= PCF8563_R_MONTH_C;
|
|
|
|
msgs[0].slave = sc->sc_addr;
|
|
error = iicbus_transfer(dev, msgs, nitems(msgs));
|
|
if (error != 0)
|
|
device_printf(dev, "%s: cannot write RTC\n", __func__);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static device_method_t pcf8563_methods[] = {
|
|
DEVMETHOD(device_probe, pcf8563_probe),
|
|
DEVMETHOD(device_attach, pcf8563_attach),
|
|
|
|
DEVMETHOD(clock_gettime, pcf8563_gettime),
|
|
DEVMETHOD(clock_settime, pcf8563_settime),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t pcf8563_driver = {
|
|
"pcf8563_rtc",
|
|
pcf8563_methods,
|
|
sizeof(struct pcf8563_softc),
|
|
};
|
|
|
|
static devclass_t pcf8563_devclass;
|
|
|
|
DRIVER_MODULE(pcf8563, iicbus, pcf8563_driver, pcf8563_devclass, NULL, NULL);
|
|
MODULE_VERSION(pcf8563, 1);
|
|
MODULE_DEPEND(pcf8563, iicbus, 1, 1, 1);
|