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  * $FreeBSD$
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   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         { 0, 0 }
   62 };
   63 
   64 static driver_t octeon_rtc_driver = {
   65         "rtc",
   66         octeon_rtc_methods,
   67         0
   68 };
   69 static devclass_t octeon_rtc_devclass;
   70 DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0);
   71 
   72 static int
   73 octeon_rtc_probe(device_t dev)
   74 {
   75         cvmx_rtc_options_t supported;
   76 
   77         if (device_get_unit(dev) != 0)
   78                 return (ENXIO);
   79 
   80         supported = cvmx_rtc_supported();
   81         if (supported == 0)
   82                 return (ENXIO);
   83 
   84         device_set_desc(dev, "Cavium Octeon Realtime Clock");
   85         return (BUS_PROBE_NOWILDCARD);
   86 }
   87 
   88 static int
   89 octeon_rtc_attach(device_t dev)
   90 {
   91         cvmx_rtc_options_t supported;
   92 
   93         supported = cvmx_rtc_supported();
   94         if ((supported & CVMX_RTC_READ) == 0)
   95                 return (ENXIO);
   96 
   97         clock_register(dev, 1000000);
   98         return (0);
   99 }
  100 
  101 static int
  102 octeon_rtc_settime(device_t dev, struct timespec *ts)
  103 {
  104         cvmx_rtc_options_t supported;
  105         uint32_t status;
  106 
  107         supported = cvmx_rtc_supported();
  108         if ((supported & CVMX_RTC_WRITE) == 0)
  109                 return (ENOTSUP);
  110 
  111         status = cvmx_rtc_write(ts->tv_sec);
  112         if (status != 0)
  113                 return (EINVAL);
  114 
  115         return (0);
  116 }
  117 
  118 static int
  119 octeon_rtc_gettime(device_t dev, struct timespec *ts)
  120 {
  121         uint32_t secs;
  122 
  123         secs = cvmx_rtc_read();
  124         if (secs == 0)
  125                 return (ENOTSUP);
  126 
  127         ts->tv_sec = secs;
  128         ts->tv_nsec = 0;
  129 
  130         return (0);
  131 }

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FreeBSD/Linux Kernel Cross Reference sys/mips/cavium/octeon_rtc.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/cavium/octeon_rtc.c