diff options
Diffstat (limited to 'sys/arm/lpc/lpc_rtc.c')
| -rw-r--r-- | sys/arm/lpc/lpc_rtc.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/sys/arm/lpc/lpc_rtc.c b/sys/arm/lpc/lpc_rtc.c new file mode 100644 index 0000000..d2812482 --- /dev/null +++ b/sys/arm/lpc/lpc_rtc.c @@ -0,0 +1,147 @@ +/*- + * Copyright (c) 2011 Jakub Wojciech Klama <jceel@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/bus.h> +#include <sys/time.h> +#include <sys/clock.h> +#include <sys/resource.h> +#include <sys/systm.h> +#include <sys/rman.h> +#include <sys/kernel.h> +#include <sys/module.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/lpc/lpcreg.h> + +#include "clock_if.h" + +struct lpc_rtc_softc { + device_t lr_dev; + struct resource * lr_mem_res; + bus_space_tag_t lr_bst; + bus_space_handle_t lr_bsh; +}; + +static int lpc_rtc_probe(device_t dev); +static int lpc_rtc_attach(device_t dev); +static int lpc_rtc_gettime(device_t dev, struct timespec *ts); +static int lpc_rtc_settime(device_t, struct timespec *); + +static int +lpc_rtc_probe(device_t dev) +{ + + if (!ofw_bus_is_compatible(dev, "lpc,rtc")) + return (ENXIO); + + device_set_desc(dev, "LPC32x0 real time clock"); + return (BUS_PROBE_DEFAULT); +} + +static int +lpc_rtc_attach(device_t dev) +{ + struct lpc_rtc_softc *sc = device_get_softc(dev); + int rid = 0; + + sc->lr_dev = dev; + + clock_register(dev, 1000000); + + sc->lr_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, + RF_ACTIVE); + if (!sc->lr_mem_res) { + device_printf(dev, "cannot allocate memory window\n"); + return (ENXIO); + } + + sc->lr_bst = rman_get_bustag(sc->lr_mem_res); + sc->lr_bsh = rman_get_bushandle(sc->lr_mem_res); + + return (0); +} + +static int +lpc_rtc_gettime(device_t dev, struct timespec *ts) +{ + struct lpc_rtc_softc *sc = device_get_softc(dev); + + ts->tv_sec = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT); + ts->tv_nsec = 0; + + return (0); +} + +static int +lpc_rtc_settime(device_t dev, struct timespec *ts) +{ + struct lpc_rtc_softc *sc = device_get_softc(dev); + uint32_t ctrl; + + /* Stop RTC */ + ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL); + bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl | LPC_RTC_CTRL_DISABLE); + + /* Write actual value */ + bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT, ts->tv_sec); + + /* Start RTC */ + ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL); + bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl & ~LPC_RTC_CTRL_DISABLE); + + return (0); +} + +static device_method_t lpc_rtc_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, lpc_rtc_probe), + DEVMETHOD(device_attach, lpc_rtc_attach), + + /* Clock interface */ + DEVMETHOD(clock_gettime, lpc_rtc_gettime), + DEVMETHOD(clock_settime, lpc_rtc_settime), + + { 0, 0 }, +}; + +static driver_t lpc_rtc_driver = { + "rtc", + lpc_rtc_methods, + sizeof(struct lpc_rtc_softc), +}; + +static devclass_t lpc_rtc_devclass; + +DRIVER_MODULE(rtc, simplebus, lpc_rtc_driver, lpc_rtc_devclass, 0, 0); |
