1 /*- 2 * Copyright (C) 2008 MARVELL INTERNATIONAL LTD. 3 * All rights reserved. 4 * 5 * Developed by Semihalf. 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 * 3. Neither the name of MARVELL nor the names of contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/lock.h> 37 #include <sys/time.h> 38 #include <sys/clock.h> 39 #include <sys/resource.h> 40 #include <sys/systm.h> 41 #include <sys/rman.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 45 #include <machine/bus.h> 46 #include <machine/resource.h> 47 48 #include "clock_if.h" 49 50 #define MV_RTC_TIME_REG 0x00 51 #define MV_RTC_DATE_REG 0x04 52 #define YEAR_BASE 2000 53 54 struct mv_rtc_softc { 55 device_t dev; 56 struct resource *res[1]; 57 }; 58 59 static struct resource_spec res_spec[] = { 60 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 61 { -1, 0 } 62 }; 63 64 static int mv_rtc_probe(device_t dev); 65 static int mv_rtc_attach(device_t dev); 66 67 static int mv_rtc_gettime(device_t dev, struct timespec *ts); 68 static int mv_rtc_settime(device_t dev, struct timespec *ts); 69 70 static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off); 71 static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, 72 uint32_t val); 73 74 static device_method_t mv_rtc_methods[] = { 75 DEVMETHOD(device_probe, mv_rtc_probe), 76 DEVMETHOD(device_attach, mv_rtc_attach), 77 78 DEVMETHOD(clock_gettime, mv_rtc_gettime), 79 DEVMETHOD(clock_settime, mv_rtc_settime), 80 81 { 0, 0 }, 82 }; 83 84 static driver_t mv_rtc_driver = { 85 "rtc", 86 mv_rtc_methods, 87 sizeof(struct mv_rtc_softc), 88 }; 89 static devclass_t mv_rtc_devclass; 90 91 DRIVER_MODULE(mv_rtc, mbus, mv_rtc_driver, mv_rtc_devclass, 0, 0); 92 93 static int 94 mv_rtc_probe(device_t dev) 95 { 96 97 device_set_desc(dev, "Marvell Integrated RTC"); 98 return (0); 99 } 100 101 static int 102 mv_rtc_attach(device_t dev) 103 { 104 struct mv_rtc_softc *sc; 105 106 sc = device_get_softc(dev); 107 sc->dev = dev; 108 109 clock_register(dev, 1000000); 110 111 if (bus_alloc_resources(dev, res_spec, sc->res)) { 112 device_printf(dev, "could not allocate resources\n"); 113 return (ENXIO); 114 } 115 116 return (0); 117 } 118 119 static int 120 mv_rtc_gettime(device_t dev, struct timespec *ts) 121 { 122 struct clocktime ct; 123 struct mv_rtc_softc *sc; 124 uint32_t val; 125 126 sc = device_get_softc(dev); 127 128 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG); 129 130 ct.nsec = 0; 131 ct.sec = FROMBCD(val & 0x7f); 132 ct.min = FROMBCD((val & 0x7f00) >> 8); 133 ct.hour = FROMBCD((val & 0x3f0000) >> 16); 134 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1; 135 136 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG); 137 138 ct.day = FROMBCD(val & 0x7f); 139 ct.mon = FROMBCD((val & 0x1f00) >> 8); 140 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16); 141 142 return (clock_ct_to_ts(&ct, ts)); 143 } 144 145 static int 146 mv_rtc_settime(device_t dev, struct timespec *ts) 147 { 148 struct clocktime ct; 149 struct mv_rtc_softc *sc; 150 uint32_t val; 151 152 sc = device_get_softc(dev); 153 154 /* Resolution: 1 sec */ 155 if (ts->tv_nsec >= 500000000) 156 ts->tv_sec++; 157 ts->tv_nsec = 0; 158 clock_ts_to_ct(ts, &ct); 159 160 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) | 161 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24); 162 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val); 163 164 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) | 165 (TOBCD(ct.year - YEAR_BASE) << 16); 166 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val); 167 168 return (0); 169 } 170 171 static uint32_t 172 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off) 173 { 174 175 return (bus_read_4(sc->res[0], off)); 176 } 177 178 static int 179 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val) 180 { 181 182 bus_write_4(sc->res[0], off, val); 183 return (0); 184 } 185