diff options
Diffstat (limited to 'sys/arm/ti/am335x/am335x_rtc.c')
| -rw-r--r-- | sys/arm/ti/am335x/am335x_rtc.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/sys/arm/ti/am335x/am335x_rtc.c b/sys/arm/ti/am335x/am335x_rtc.c new file mode 100644 index 000000000000..c2612d2fc7a9 --- /dev/null +++ b/sys/arm/ti/am335x/am335x_rtc.c @@ -0,0 +1,213 @@ +/*- + * 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.h> +#include <dev/ofw/ofw_bus_subr.h> +#include <arm/ti/ti_sysc.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_sysc_clock_enable(device_get_parent(dev)); + 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[0] != NULL) + 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); +MODULE_DEPEND(am335x_rtc, ti_sysc, 1, 1, 1); |