octeon_rtc.c revision 265999
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: stable/10/sys/mips/cavium/octeon_rtc.c 265999 2014-05-14 01:35:43Z ian $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/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 45static int octeon_rtc_attach(device_t dev); 46static int octeon_rtc_probe(device_t dev); 47 48static int octeon_rtc_settime(device_t dev, struct timespec *ts); 49static int octeon_rtc_gettime(device_t dev, struct timespec *ts); 50 51static 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 63static driver_t octeon_rtc_driver = { 64 "rtc", 65 octeon_rtc_methods, 66 0 67}; 68static devclass_t octeon_rtc_devclass; 69DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0); 70 71static int 72octeon_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 87static int 88octeon_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 100static int 101octeon_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 117static int 118octeon_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} 131