text: /*-
   * Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
   * All rights reserved.
   *
   * Developed by Semihalf.
   *
   * 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.
   * 3. Neither the name of MARVELL nor the names of contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY 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 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: soc2013/dpl/head/sys/arm/mv/rtc.c 209174 2010-06-13 13:28:53Z raj $");
  #include <sys/param.h>
  #include <sys/bus.h>
  #include <sys/lock.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 "clock_if.h"
  
  #define MV_RTC_TIME_REG		0x00
  #define MV_RTC_DATE_REG		0x04
  #define YEAR_BASE		2000
  
  struct mv_rtc_softc {
  	device_t dev;
  	struct resource *res[1];
  };
  
  static struct resource_spec res_spec[] = {
  	{ SYS_RES_MEMORY, 0, RF_ACTIVE },
  	{ -1, 0 }
  };
  
  static int mv_rtc_probe(device_t dev);
  static int mv_rtc_attach(device_t dev);
  
  static int mv_rtc_gettime(device_t dev, struct timespec *ts);
  static int mv_rtc_settime(device_t dev, struct timespec *ts);
  
  static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off);
  static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off,
      uint32_t val);
  
  static device_method_t mv_rtc_methods[] = {
  	DEVMETHOD(device_probe,		mv_rtc_probe),
  	DEVMETHOD(device_attach,	mv_rtc_attach),
  
  	DEVMETHOD(clock_gettime,	mv_rtc_gettime),
  	DEVMETHOD(clock_settime,	mv_rtc_settime),
  
  	{ 0, 0 },
  };
  
  static driver_t mv_rtc_driver = {
  	"rtc",
  	mv_rtc_methods,
  	sizeof(struct mv_rtc_softc),
  };
  static devclass_t mv_rtc_devclass;
  
  DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, mv_rtc_devclass, 0, 0);
  
  static int
  mv_rtc_probe(device_t dev)
  {
  
  	if (!ofw_bus_is_compatible(dev, "mrvl,rtc"))
  		return (ENXIO);
  
  	device_set_desc(dev, "Marvell Integrated RTC");
  	return (BUS_PROBE_DEFAULT);
  }
  
  static int
  mv_rtc_attach(device_t dev)
  {
  	struct mv_rtc_softc *sc;
  
  	sc = device_get_softc(dev);
  	sc->dev = dev;
  
  	clock_register(dev, 1000000);
  
  	if (bus_alloc_resources(dev, res_spec, sc->res)) {
  		device_printf(dev, "could not allocate resources\n");
  		return (ENXIO);
  	}
  
  	return (0);
  }
  
  static int
  mv_rtc_gettime(device_t dev, struct timespec *ts)
  {
  	struct clocktime ct;
  	struct mv_rtc_softc *sc;
  	uint32_t val;
  
  	sc = device_get_softc(dev);
  
  	val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
  
  	ct.nsec = 0;
  	ct.sec = FROMBCD(val & 0x7f);
  	ct.min = FROMBCD((val & 0x7f00) >> 8);
  	ct.hour = FROMBCD((val & 0x3f0000) >> 16);
  	ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1;
  
  	val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
  
  	ct.day = FROMBCD(val & 0x7f);
  	ct.mon = FROMBCD((val & 0x1f00) >> 8);
  	ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
  
  	return (clock_ct_to_ts(&ct, ts));
  }
  
  static int
  mv_rtc_settime(device_t dev, struct timespec *ts)
  {
  	struct clocktime ct;
  	struct mv_rtc_softc *sc;
  	uint32_t val;
  
  	sc = device_get_softc(dev);
  
  	/* Resolution: 1 sec */
  	if (ts->tv_nsec >= 500000000)
  		ts->tv_sec++;
  	ts->tv_nsec = 0;
  	clock_ts_to_ct(ts, &ct);
  
  	val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) |
  	    (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24);
  	mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val);
  
  	val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) |
  	    (TOBCD(ct.year - YEAR_BASE) << 16);
  	mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val);
  
  	return (0);
  }
  
  static uint32_t
  mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
  {
  
  	return (bus_read_4(sc->res[0], off));
  }
  
  static int
  mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
  {
  
  	bus_write_4(sc->res[0], off, val);
  	return (0);
  }
  