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/*-
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/ti_prcm.h>
#include <arm/ti/am335x/am335x_rtcvar.h>
#include <arm/ti/am335x/am335x_rtcreg.h>
#define RTC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define RTC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define RTC_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
device_get_nameunit(_sc->sc_dev), "am335x_rtc", MTX_DEF)
#define RTC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
#define RTC_READ4(_sc, reg) \
bus_read_4((_sc)->sc_mem_res, reg)
#define RTC_WRITE4(_sc, reg, value) \
bus_write_4((_sc)->sc_mem_res, reg, value)
#define RTC_MAXIRQS 2
struct am335x_rtc_softc {
device_t sc_dev;
struct mtx sc_mtx;
struct resource *sc_irq_res[RTC_MAXIRQS];
struct resource *sc_mem_res;
};
static struct am335x_rtc_softc *rtc_sc = NULL;
static struct resource_spec am335x_rtc_irq_spec[] = {
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 1, RF_ACTIVE },
{ -1, 0, 0 }
};
static int
am335x_rtc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ti,da830-rtc"))
return (ENXIO);
device_set_desc(dev, "AM335x RTC (power management mode)");
return (BUS_PROBE_DEFAULT);
}
static int
am335x_rtc_attach(device_t dev)
{
int rid;
struct am335x_rtc_softc *sc;
uint32_t rev;
if (rtc_sc != NULL)
return (ENXIO);
rtc_sc = sc = device_get_softc(dev);
sc->sc_dev = dev;
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->sc_mem_res) {
device_printf(dev, "cannot allocate memory resources\n");
return (ENXIO);
}
if (bus_alloc_resources(dev, am335x_rtc_irq_spec, sc->sc_irq_res) != 0) {
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
device_printf(dev, "cannot allocate irq resources\n");
return (ENXIO);
}
RTC_LOCK_INIT(sc);
/* Enable the RTC module. */
ti_prcm_clk_enable(RTC_CLK);
rev = RTC_READ4(sc, RTC_REVISION);
device_printf(dev, "AM335X RTC v%d.%d.%d\n",
(rev >> 8) & 0x7, (rev >> 6) & 0x3, rev & 0x3f);
/* Unlock the RTC. */
RTC_WRITE4(sc, RTC_KICK0R, RTC_KICK0R_PASS);
RTC_WRITE4(sc, RTC_KICK1R, RTC_KICK1R_PASS);
/* Stop the RTC, we don't need it right now. */
RTC_WRITE4(sc, RTC_CTRL, 0);
/* Disable interrupts. */
RTC_WRITE4(sc, RTC_INTR, 0);
/* Ack any pending interrupt. */
RTC_WRITE4(sc, RTC_STATUS, RTC_STATUS_ALARM2 | RTC_STATUS_ALARM);
/* Enable external clock (xtal) and 32 kHz clock. */
RTC_WRITE4(sc, RTC_OSC, RTC_OSC_32KCLK_EN | RTC_OSC_32KCLK_SEL);
/* Enable pmic_pwr_enable. */
RTC_WRITE4(sc, RTC_PMIC, PMIC_PWR_ENABLE);
return (0);
}
static int
am335x_rtc_detach(device_t dev)
{
struct am335x_rtc_softc *sc;
sc = device_get_softc(dev);
if (sc->sc_irq_res)
bus_release_resources(dev, am335x_rtc_irq_spec, sc->sc_irq_res);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
RTC_LOCK_DESTROY(sc);
return (0);
}
void
am335x_rtc_pmic_pwr_toggle(void)
{
int timeout;
struct clocktime ct;
struct timespec ts;
/*
* We stop the RTC so we don't need to check the STATUS.BUSY bit
* before update ALARM2 registers.
*/
timeout = 10;
RTC_WRITE4(rtc_sc, RTC_CTRL, 0);
while (--timeout && RTC_READ4(rtc_sc, RTC_STATUS) & RTC_STATUS_RUN)
DELAY(100);
if (timeout == 0) {
device_printf(rtc_sc->sc_dev, "RTC does not stop.\n");
return;
}
/* Program the ALARM2 to fire in 2 seconds. */
ct.dow = 0;
ct.nsec = 0;
ct.sec = FROMBCD(RTC_READ4(rtc_sc, RTC_SECONDS) & 0x7f);
ct.min = FROMBCD(RTC_READ4(rtc_sc, RTC_MINUTES) & 0x7f);
ct.hour = FROMBCD(RTC_READ4(rtc_sc, RTC_HOURS) & 0x3f);
ct.day = FROMBCD(RTC_READ4(rtc_sc, RTC_DAYS) & 0x3f);
ct.mon = FROMBCD(RTC_READ4(rtc_sc, RTC_MONTHS) & 0x1f);
ct.year = FROMBCD(RTC_READ4(rtc_sc, RTC_YEARS) & 0xff);
ct.year += POSIX_BASE_YEAR;
clock_ct_to_ts(&ct, &ts);
ts.tv_sec += 2;
clock_ts_to_ct(&ts, &ct);
RTC_WRITE4(rtc_sc, RTC_ALARM2_SECONDS, TOBCD(ct.sec));
RTC_WRITE4(rtc_sc, RTC_ALARM2_MINUTES, TOBCD(ct.min));
RTC_WRITE4(rtc_sc, RTC_ALARM2_HOURS, TOBCD(ct.hour));
RTC_WRITE4(rtc_sc, RTC_ALARM2_DAYS, TOBCD(ct.day));
RTC_WRITE4(rtc_sc, RTC_ALARM2_MONTHS, TOBCD(ct.mon));
RTC_WRITE4(rtc_sc, RTC_ALARM2_YEARS, TOBCD(ct.year - POSIX_BASE_YEAR));
/* Enable ALARM2 interrupt. */
RTC_WRITE4(rtc_sc, RTC_INTR, RTC_INTR_ALARM2);
/* Start count. */
RTC_WRITE4(rtc_sc, RTC_CTRL, RTC_CTRL_RUN);
}
static device_method_t am335x_rtc_methods[] = {
DEVMETHOD(device_probe, am335x_rtc_probe),
DEVMETHOD(device_attach, am335x_rtc_attach),
DEVMETHOD(device_detach, am335x_rtc_detach),
DEVMETHOD_END
};
static driver_t am335x_rtc_driver = {
"am335x_rtc",
am335x_rtc_methods,
sizeof(struct am335x_rtc_softc),
};
static devclass_t am335x_rtc_devclass;
DRIVER_MODULE(am335x_rtc, simplebus, am335x_rtc_driver, am335x_rtc_devclass, 0, 0);
MODULE_VERSION(am335x_rtc, 1);
MODULE_DEPEND(am335x_rtc, simplebus, 1, 1, 1);
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