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/*-
* Copyright (c) 2006 M. Warner Losh. 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 ``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 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/bus.h>
#include <sys/clock.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <arm/at91/at91_rtcreg.h>
#include "clock_if.h"
struct at91_rtc_softc
{
device_t dev; /* Myself */
void *intrhand; /* Interrupt handle */
struct resource *irq_res; /* IRQ resource */
struct resource *mem_res; /* Memory resource */
struct mtx sc_mtx; /* basically a perimeter lock */
};
static inline uint32_t
RD4(struct at91_rtc_softc *sc, bus_size_t off)
{
return bus_read_4(sc->mem_res, off);
}
static inline void
WR4(struct at91_rtc_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
#define AT91_RTC_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define AT91_RTC_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define AT91_RTC_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
"rtc", MTX_SPIN)
#define AT91_RTC_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
#define AT91_RTC_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
#define AT91_RTC_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
static devclass_t at91_rtc_devclass;
/* bus entry points */
static int at91_rtc_probe(device_t dev);
static int at91_rtc_attach(device_t dev);
static int at91_rtc_detach(device_t dev);
static void at91_rtc_intr(void *);
/* helper routines */
static int at91_rtc_activate(device_t dev);
static void at91_rtc_deactivate(device_t dev);
static int
at91_rtc_probe(device_t dev)
{
device_set_desc(dev, "RTC");
return (0);
}
static int
at91_rtc_attach(device_t dev)
{
struct at91_rtc_softc *sc = device_get_softc(dev);
int err;
sc->dev = dev;
err = at91_rtc_activate(dev);
if (err)
goto out;
AT91_RTC_LOCK_INIT(sc);
/*
* Activate the interrupt, but disable all interrupts in the hardware
*/
WR4(sc, RTC_IDR, 0xffffffff);
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
at91_rtc_intr, NULL, sc, &sc->intrhand);
if (err) {
AT91_RTC_LOCK_DESTROY(sc);
goto out;
}
clock_register(dev, 1000000);
out:;
if (err)
at91_rtc_deactivate(dev);
return (err);
}
static int
at91_rtc_detach(device_t dev)
{
return (EBUSY); /* XXX */
}
static int
at91_rtc_activate(device_t dev)
{
struct at91_rtc_softc *sc;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->irq_res == NULL)
goto errout;
return (0);
errout:
at91_rtc_deactivate(dev);
return (ENOMEM);
}
static void
at91_rtc_deactivate(device_t dev)
{
struct at91_rtc_softc *sc;
sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
bus_generic_detach(sc->dev);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_IOPORT,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
sc->irq_res = 0;
return;
}
static int
at91_rtc_intr(void *xsc)
{
struct at91_rtc_softc *sc = xsc;
#if 0
uint32_t status;
/* Reading the status also clears the interrupt */
status = RD4(sc, RTC_SR);
if (status == 0)
return;
AT91_RTC_LOCK(sc);
AT91_RTC_UNLOCK(sc);
#endif
wakeup(sc);
return (FILTER_HANDLED);
}
/*
* Get the time of day clock and return it in ts.
* Return 0 on success, an error number otherwise.
*/
static int
at91_rtc_gettime(device_t dev, struct timespec *ts)
{
struct clocktime ct;
uint32_t timr, calr;
struct at91_rtc_softc *sc;
sc = device_get_softc(dev);
timr = RD4(sc, RTC_TIMR);
calr = RD4(sc, RTC_CALR);
ct.nsec = 0;
ct.sec = RTC_TIMR_SEC(timr);
ct.min = RTC_TIMR_MIN(timr);
ct.hour = RTC_TIMR_HR(timr);
ct.year = RTC_CALR_CEN(calr) * 100 + RTC_CALR_YEAR(calr);
ct.mon = RTC_CALR_MON(calr);
ct.day = RTC_CALR_DAY(calr);
ct.dow = -1;
return clock_ct_to_ts(&ct, ts);
}
/*
* Set the time of day clock based on the value of the struct timespec arg.
* Return 0 on success, an error number otherwise.
*/
static int
at91_rtc_settime(device_t dev, struct timespec *ts)
{
struct at91_rtc_softc *sc;
struct clocktime ct;
sc = device_get_softc(dev);
clock_ts_to_ct(ts, &ct);
WR4(sc, RTC_TIMR, RTC_TIMR_MK(ct.hour, ct.min, ct.sec));
WR4(sc, RTC_CALR, RTC_CALR_MK(ct.year, ct.mon, ct.day, ct.dow));
return (0);
}
static device_method_t at91_rtc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, at91_rtc_probe),
DEVMETHOD(device_attach, at91_rtc_attach),
DEVMETHOD(device_detach, at91_rtc_detach),
/* clock interface */
DEVMETHOD(clock_gettime, at91_rtc_gettime),
DEVMETHOD(clock_settime, at91_rtc_settime),
{ 0, 0 }
};
static driver_t at91_rtc_driver = {
"at91_rtc",
at91_rtc_methods,
sizeof(struct at91_rtc_softc),
};
DRIVER_MODULE(at91_rtc, atmelarm, at91_rtc_driver, at91_rtc_devclass, 0, 0);
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