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 <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include "clock_if.h" 52 53 #define MV_RTC_TIME_REG 0x00 54 #define MV_RTC_DATE_REG 0x04 55 #define YEAR_BASE 2000 56 57 struct mv_rtc_softc { 58 device_t dev; 59 struct resource *res[1]; 60 }; 61 62 static struct resource_spec res_spec[] = { 63 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 64 { -1, 0 } 65 }; 66 67 static int mv_rtc_probe(device_t dev); 68 static int mv_rtc_attach(device_t dev); 69 70 static int mv_rtc_gettime(device_t dev, struct timespec *ts); 71 static int mv_rtc_settime(device_t dev, struct timespec *ts); 72 73 static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off); 74 static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, 75 uint32_t val); 76 77 static device_method_t mv_rtc_methods[] = { 78 DEVMETHOD(device_probe, mv_rtc_probe), 79 DEVMETHOD(device_attach, mv_rtc_attach), 80 81 DEVMETHOD(clock_gettime, mv_rtc_gettime), 82 DEVMETHOD(clock_settime, mv_rtc_settime), 83 84 { 0, 0 }, 85 }; 86 87 static driver_t mv_rtc_driver = { 88 "rtc", 89 mv_rtc_methods, 90 sizeof(struct mv_rtc_softc), 91 }; 92 static devclass_t mv_rtc_devclass; 93 94 DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, mv_rtc_devclass, 0, 0); 95 96 static int 97 mv_rtc_probe(device_t dev) 98 { 99 100 if (!ofw_bus_is_compatible(dev, "mrvl,rtc")) 101 return (ENXIO); 102 103 device_set_desc(dev, "Marvell Integrated RTC"); 104 return (BUS_PROBE_DEFAULT); 105 } 106 107 static int 108 mv_rtc_attach(device_t dev) 109 { 110 struct mv_rtc_softc *sc; 111 112 sc = device_get_softc(dev); 113 sc->dev = dev; 114 115 clock_register(dev, 1000000); 116 117 if (bus_alloc_resources(dev, res_spec, sc->res)) { 118 device_printf(dev, "could not allocate resources\n"); 119 return (ENXIO); 120 } 121 122 return (0); 123 } 124 125 static int 126 mv_rtc_gettime(device_t dev, struct timespec *ts) 127 { 128 struct clocktime ct; 129 struct mv_rtc_softc *sc; 130 uint32_t val; 131 132 sc = device_get_softc(dev); 133 134 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG); 135 136 ct.nsec = 0; 137 ct.sec = FROMBCD(val & 0x7f); 138 ct.min = FROMBCD((val & 0x7f00) >> 8); 139 ct.hour = FROMBCD((val & 0x3f0000) >> 16); 140 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1; 141 142 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG); 143 144 ct.day = FROMBCD(val & 0x7f); 145 ct.mon = FROMBCD((val & 0x1f00) >> 8); 146 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16); 147 148 return (clock_ct_to_ts(&ct, ts)); 149 } 150 151 static int 152 mv_rtc_settime(device_t dev, struct timespec *ts) 153 { 154 struct clocktime ct; 155 struct mv_rtc_softc *sc; 156 uint32_t val; 157 158 sc = device_get_softc(dev); 159 160 /* Resolution: 1 sec */ 161 if (ts->tv_nsec >= 500000000) 162 ts->tv_sec++; 163 ts->tv_nsec = 0; 164 clock_ts_to_ct(ts, &ct); 165 166 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) | 167 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24); 168 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val); 169 170 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) | 171 (TOBCD(ct.year - YEAR_BASE) << 16); 172 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val); 173 174 return (0); 175 } 176 177 static uint32_t 178 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off) 179 { 180 181 return (bus_read_4(sc->res[0], off)); 182 } 183 184 static int 185 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val) 186 { 187 188 bus_write_4(sc->res[0], off, val); 189 return (0); 190 } 191