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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/mips/cavium/octeon_rtc.c 326259 2017-11-27 15:07:26Z pfg $
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/12/sys/mips/cavium/octeon_rtc.c 326259 2017-11-27 15:07:26Z pfg $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/clock.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/module.h>
   41 
   42 #include <contrib/octeon-sdk/cvmx.h>
   43 #include <contrib/octeon-sdk/cvmx-rtc.h>
   44 
   45 #include "clock_if.h"
   46 
   47 static int      octeon_rtc_attach(device_t dev);
   48 static int      octeon_rtc_probe(device_t dev);
   49 
   50 static int      octeon_rtc_settime(device_t dev, struct timespec *ts);
   51 static int      octeon_rtc_gettime(device_t dev, struct timespec *ts);
   52 
   53 static device_method_t octeon_rtc_methods[] = {
   54         /* Device interface */
   55         DEVMETHOD(device_probe,         octeon_rtc_probe),
   56         DEVMETHOD(device_attach,        octeon_rtc_attach),
   57 
   58         /* clock interface */
   59         DEVMETHOD(clock_gettime,        octeon_rtc_gettime),
   60         DEVMETHOD(clock_settime,        octeon_rtc_settime),
   61 
   62         { 0, 0 }
   63 };
   64 
   65 static driver_t octeon_rtc_driver = {
   66         "rtc",
   67         octeon_rtc_methods,
   68         0
   69 };
   70 static devclass_t octeon_rtc_devclass;
   71 DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0);
   72 
   73 static int
   74 octeon_rtc_probe(device_t dev)
   75 {
   76         cvmx_rtc_options_t supported;
   77 
   78         if (device_get_unit(dev) != 0)
   79                 return (ENXIO);
   80 
   81         supported = cvmx_rtc_supported();
   82         if (supported == 0)
   83                 return (ENXIO);
   84 
   85         device_set_desc(dev, "Cavium Octeon Realtime Clock");
   86         return (BUS_PROBE_NOWILDCARD);
   87 }
   88 
   89 static int
   90 octeon_rtc_attach(device_t dev)
   91 {
   92         cvmx_rtc_options_t supported;
   93 
   94         supported = cvmx_rtc_supported();
   95         if ((supported & CVMX_RTC_READ) == 0)
   96                 return (ENXIO);
   97 
   98         clock_register(dev, 1000000);
   99         return (0);
  100 }
  101 
  102 static int
  103 octeon_rtc_settime(device_t dev, struct timespec *ts)
  104 {
  105         cvmx_rtc_options_t supported;
  106         uint32_t status;
  107 
  108         supported = cvmx_rtc_supported();
  109         if ((supported & CVMX_RTC_WRITE) == 0)
  110                 return (ENOTSUP);
  111 
  112         status = cvmx_rtc_write(ts->tv_sec);
  113         if (status != 0)
  114                 return (EINVAL);
  115 
  116         return (0);
  117 }
  118 
  119 static int
  120 octeon_rtc_gettime(device_t dev, struct timespec *ts)
  121 {
  122         uint32_t secs;
  123 
  124         secs = cvmx_rtc_read();
  125         if (secs == 0)
  126                 return (ENOTSUP);
  127 
  128         ts->tv_sec = secs;
  129         ts->tv_nsec = 0;
  130 
  131         return (0);
  132 }

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