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/mips/cavium/octeon_rtc.c

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    1 /*-
    2  * Copyright (c) 2010 Juli Mallett <jmallett@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  * $FreeBSD: releng/10.4/sys/mips/cavium/octeon_rtc.c 265999 2014-05-14 01:35:43Z ian $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/10.4/sys/mips/cavium/octeon_rtc.c 265999 2014-05-14 01:35:43Z ian $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/clock.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/module.h>
   39 
   40 #include <contrib/octeon-sdk/cvmx.h>
   41 #include <contrib/octeon-sdk/cvmx-rtc.h>
   42 
   43 #include "clock_if.h"
   44 
   45 static int      octeon_rtc_attach(device_t dev);
   46 static int      octeon_rtc_probe(device_t dev);
   47 
   48 static int      octeon_rtc_settime(device_t dev, struct timespec *ts);
   49 static int      octeon_rtc_gettime(device_t dev, struct timespec *ts);
   50 
   51 static device_method_t octeon_rtc_methods[] = {
   52         /* Device interface */
   53         DEVMETHOD(device_probe,         octeon_rtc_probe),
   54         DEVMETHOD(device_attach,        octeon_rtc_attach),
   55 
   56         /* clock interface */
   57         DEVMETHOD(clock_gettime,        octeon_rtc_gettime),
   58         DEVMETHOD(clock_settime,        octeon_rtc_settime),
   59 
   60         { 0, 0 }
   61 };
   62 
   63 static driver_t octeon_rtc_driver = {
   64         "rtc",
   65         octeon_rtc_methods,
   66         0
   67 };
   68 static devclass_t octeon_rtc_devclass;
   69 DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0);
   70 
   71 static int
   72 octeon_rtc_probe(device_t dev)
   73 {
   74         cvmx_rtc_options_t supported;
   75 
   76         if (device_get_unit(dev) != 0)
   77                 return (ENXIO);
   78 
   79         supported = cvmx_rtc_supported();
   80         if (supported == 0)
   81                 return (ENXIO);
   82 
   83         device_set_desc(dev, "Cavium Octeon Realtime Clock");
   84         return (BUS_PROBE_NOWILDCARD);
   85 }
   86 
   87 static int
   88 octeon_rtc_attach(device_t dev)
   89 {
   90         cvmx_rtc_options_t supported;
   91 
   92         supported = cvmx_rtc_supported();
   93         if ((supported & CVMX_RTC_READ) == 0)
   94                 return (ENXIO);
   95 
   96         clock_register(dev, 1000000);
   97         return (0);
   98 }
   99 
  100 static int
  101 octeon_rtc_settime(device_t dev, struct timespec *ts)
  102 {
  103         cvmx_rtc_options_t supported;
  104         uint32_t status;
  105 
  106         supported = cvmx_rtc_supported();
  107         if ((supported & CVMX_RTC_WRITE) == 0)
  108                 return (ENOTSUP);
  109 
  110         status = cvmx_rtc_write(ts->tv_sec);
  111         if (status != 0)
  112                 return (EINVAL);
  113 
  114         return (0);
  115 }
  116 
  117 static int
  118 octeon_rtc_gettime(device_t dev, struct timespec *ts)
  119 {
  120         uint32_t secs;
  121 
  122         secs = cvmx_rtc_read();
  123         if (secs == 0)
  124                 return (ENOTSUP);
  125 
  126         ts->tv_sec = secs;
  127         ts->tv_nsec = 0;
  128 
  129         return (0);
  130 }

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