1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki 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 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 * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/bus.h> 38 #include <sys/clock.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/module.h> 42 #include <sys/mutex.h> 43 #include <sys/resource.h> 44 #include <sys/rman.h> 45 46 #include <machine/bus.h> 47 #include <machine/resource.h> 48 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include "ds1553_reg.h" 52 #include "clock_if.h" 53 54 static devclass_t rtc_devclass; 55 56 static int rtc_attach(device_t dev); 57 static int rtc_probe(device_t dev); 58 59 static device_method_t rtc_methods[] = { 60 /* Device interface */ 61 DEVMETHOD(device_probe, rtc_probe), 62 DEVMETHOD(device_attach, rtc_attach), 63 64 /* clock interface */ 65 DEVMETHOD(clock_gettime, ds1553_gettime), 66 DEVMETHOD(clock_settime, ds1553_settime), 67 { 0, 0 } 68 }; 69 70 static driver_t rtc_driver = { 71 "rtc", 72 rtc_methods, 73 sizeof(struct ds1553_softc), 74 }; 75 76 DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0); 77 78 static int 79 rtc_probe(device_t dev) 80 { 81 82 if (!ofw_bus_is_compatible(dev, "dallas,ds1553")) 83 return (ENXIO); 84 85 device_set_desc(dev, "Dallas Semiconductor DS1553 RTC"); 86 return (BUS_PROBE_DEFAULT); 87 } 88 89 static int 90 rtc_attach(device_t dev) 91 { 92 struct timespec ts; 93 struct ds1553_softc *sc; 94 int error; 95 96 sc = device_get_softc(dev); 97 bzero(sc, sizeof(struct ds1553_softc)); 98 99 mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN); 100 101 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 102 RF_ACTIVE); 103 if (sc->res == NULL) { 104 device_printf(dev, "cannot allocate resources\n"); 105 mtx_destroy(&sc->sc_mtx); 106 return (ENXIO); 107 } 108 109 sc->sc_bst = rman_get_bustag(sc->res); 110 sc->sc_bsh = rman_get_bushandle(sc->res); 111 112 if ((error = ds1553_attach(dev)) != 0) { 113 device_printf(dev, "cannot attach time of day clock\n"); 114 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 115 mtx_destroy(&sc->sc_mtx); 116 return (error); 117 } 118 119 clock_register(dev, 1000000); 120 121 if (bootverbose) { 122 ds1553_gettime(dev, &ts); 123 device_printf(dev, "current time: %ld.%09ld\n", 124 (long)ts.tv_sec, ts.tv_nsec); 125 } 126 127 return (0); 128 } 129