1 /*- 2 * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki 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 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 * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/cdefs.h> 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/clock.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 #include <sys/resource.h> 42 #include <sys/rman.h> 43 44 #include <machine/bus.h> 45 #include <machine/resource.h> 46 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include "ds1553_reg.h" 50 #include "clock_if.h" 51 52 static devclass_t rtc_devclass; 53 54 static int rtc_attach(device_t dev); 55 static int rtc_probe(device_t dev); 56 57 static device_method_t rtc_methods[] = { 58 /* Device interface */ 59 DEVMETHOD(device_probe, rtc_probe), 60 DEVMETHOD(device_attach, rtc_attach), 61 62 /* clock interface */ 63 DEVMETHOD(clock_gettime, ds1553_gettime), 64 DEVMETHOD(clock_settime, ds1553_settime), 65 66 { 0, 0 } 67 }; 68 69 static driver_t rtc_driver = { 70 "rtc", 71 rtc_methods, 72 sizeof(struct ds1553_softc), 73 }; 74 75 DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0); 76 77 static int 78 rtc_probe(device_t dev) 79 { 80 81 if (!ofw_bus_is_compatible(dev, "dallas,ds1553")) 82 return (ENXIO); 83 84 device_set_desc(dev, "Dallas Semiconductor DS1553 RTC"); 85 return (BUS_PROBE_DEFAULT); 86 } 87 88 static int 89 rtc_attach(device_t dev) 90 { 91 struct timespec ts; 92 struct ds1553_softc *sc; 93 int error; 94 95 sc = device_get_softc(dev); 96 bzero(sc, sizeof(struct ds1553_softc)); 97 98 mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN); 99 100 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 101 RF_ACTIVE); 102 if (sc->res == NULL) { 103 device_printf(dev, "cannot allocate resources\n"); 104 mtx_destroy(&sc->sc_mtx); 105 return (ENXIO); 106 } 107 108 sc->sc_bst = rman_get_bustag(sc->res); 109 sc->sc_bsh = rman_get_bushandle(sc->res); 110 111 if ((error = ds1553_attach(dev)) != 0) { 112 device_printf(dev, "cannot attach time of day clock\n"); 113 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 114 mtx_destroy(&sc->sc_mtx); 115 return (error); 116 } 117 118 clock_register(dev, 1000000); 119 120 if (bootverbose) { 121 ds1553_gettime(dev, &ts); 122 device_printf(dev, "current time: %ld.%09ld\n", 123 (long)ts.tv_sec, ts.tv_nsec); 124 } 125 126 return (0); 127 } 128