The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/lpc/lpc_rtc.c

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    1 /*-
    2  * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.0/sys/arm/lpc/lpc_rtc.c 239278 2012-08-15 05:37:10Z gonzo $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/time.h>
   33 #include <sys/clock.h>
   34 #include <sys/resource.h>
   35 #include <sys/systm.h>
   36 #include <sys/rman.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 
   40 #include <machine/bus.h>
   41 #include <machine/resource.h>
   42 
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 
   46 #include <arm/lpc/lpcreg.h>
   47 
   48 #include "clock_if.h"
   49 
   50 struct lpc_rtc_softc {
   51         device_t                        lr_dev;
   52         struct resource *               lr_mem_res;
   53         bus_space_tag_t                 lr_bst;
   54         bus_space_handle_t              lr_bsh;
   55 };
   56 
   57 static int lpc_rtc_probe(device_t dev);
   58 static int lpc_rtc_attach(device_t dev);
   59 static int lpc_rtc_gettime(device_t dev, struct timespec *ts);
   60 static int lpc_rtc_settime(device_t, struct timespec *);
   61 
   62 static int
   63 lpc_rtc_probe(device_t dev)
   64 {
   65 
   66         if (!ofw_bus_is_compatible(dev, "lpc,rtc"))
   67                 return (ENXIO);
   68 
   69         device_set_desc(dev, "LPC32x0 real time clock");
   70         return (BUS_PROBE_DEFAULT);
   71 }
   72 
   73 static int
   74 lpc_rtc_attach(device_t dev)
   75 {
   76         struct lpc_rtc_softc *sc = device_get_softc(dev);
   77         int rid = 0;
   78 
   79         sc->lr_dev = dev;
   80 
   81         clock_register(dev, 1000000);
   82 
   83         sc->lr_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
   84             RF_ACTIVE);
   85         if (!sc->lr_mem_res) {
   86                 device_printf(dev, "cannot allocate memory window\n");
   87                 return (ENXIO);
   88         }
   89 
   90         sc->lr_bst = rman_get_bustag(sc->lr_mem_res);
   91         sc->lr_bsh = rman_get_bushandle(sc->lr_mem_res);
   92 
   93         return (0);
   94 }
   95 
   96 static int
   97 lpc_rtc_gettime(device_t dev, struct timespec *ts)
   98 {
   99         struct lpc_rtc_softc *sc = device_get_softc(dev);
  100 
  101         ts->tv_sec = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT);
  102         ts->tv_nsec = 0;
  103 
  104         return (0);
  105 }
  106 
  107 static int
  108 lpc_rtc_settime(device_t dev, struct timespec *ts)
  109 {
  110         struct lpc_rtc_softc *sc = device_get_softc(dev);
  111         uint32_t ctrl;
  112 
  113         /* Stop RTC */
  114         ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
  115         bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl | LPC_RTC_CTRL_DISABLE);
  116 
  117         /* Write actual value */
  118         bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT, ts->tv_sec);
  119 
  120         /* Start RTC */
  121         ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
  122         bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl & ~LPC_RTC_CTRL_DISABLE);
  123 
  124         return (0);     
  125 }
  126 
  127 static device_method_t lpc_rtc_methods[] = {
  128         /* Device interface */
  129         DEVMETHOD(device_probe,         lpc_rtc_probe),
  130         DEVMETHOD(device_attach,        lpc_rtc_attach),
  131 
  132         /* Clock interface */
  133         DEVMETHOD(clock_gettime,        lpc_rtc_gettime),
  134         DEVMETHOD(clock_settime,        lpc_rtc_settime),
  135 
  136         { 0, 0 },
  137 };
  138 
  139 static driver_t lpc_rtc_driver = {
  140         "rtc",
  141         lpc_rtc_methods,
  142         sizeof(struct lpc_rtc_softc),
  143 };
  144 
  145 static devclass_t lpc_rtc_devclass;
  146 
  147 DRIVER_MODULE(rtc, simplebus, lpc_rtc_driver, lpc_rtc_devclass, 0, 0);

Cache object: 79f7111deb72fd6b8a8d0ef6c2f1819b


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