1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 2008 MARVELL INTERNATIONAL LTD. 5 * All rights reserved. 6 * 7 * Developed by Semihalf. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of MARVELL nor the names of contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 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 93 DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, 0, 0); 94 95 static int 96 mv_rtc_probe(device_t dev) 97 { 98 99 if (!ofw_bus_status_okay(dev)) 100 return (ENXIO); 101 102 if (!ofw_bus_is_compatible(dev, "mrvl,rtc")) 103 return (ENXIO); 104 105 device_set_desc(dev, "Marvell Integrated RTC"); 106 return (BUS_PROBE_DEFAULT); 107 } 108 109 static int 110 mv_rtc_attach(device_t dev) 111 { 112 struct mv_rtc_softc *sc; 113 114 sc = device_get_softc(dev); 115 sc->dev = dev; 116 117 clock_register(dev, 1000000); 118 119 if (bus_alloc_resources(dev, res_spec, sc->res)) { 120 device_printf(dev, "could not allocate resources\n"); 121 return (ENXIO); 122 } 123 124 return (0); 125 } 126 127 static int 128 mv_rtc_gettime(device_t dev, struct timespec *ts) 129 { 130 struct clocktime ct; 131 struct mv_rtc_softc *sc; 132 uint32_t val; 133 134 sc = device_get_softc(dev); 135 136 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG); 137 138 ct.nsec = 0; 139 ct.sec = FROMBCD(val & 0x7f); 140 ct.min = FROMBCD((val & 0x7f00) >> 8); 141 ct.hour = FROMBCD((val & 0x3f0000) >> 16); 142 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1; 143 144 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG); 145 146 ct.day = FROMBCD(val & 0x7f); 147 ct.mon = FROMBCD((val & 0x1f00) >> 8); 148 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16); 149 150 return (clock_ct_to_ts(&ct, ts)); 151 } 152 153 static int 154 mv_rtc_settime(device_t dev, struct timespec *ts) 155 { 156 struct clocktime ct; 157 struct mv_rtc_softc *sc; 158 uint32_t val; 159 160 sc = device_get_softc(dev); 161 162 /* Resolution: 1 sec */ 163 if (ts->tv_nsec >= 500000000) 164 ts->tv_sec++; 165 ts->tv_nsec = 0; 166 clock_ts_to_ct(ts, &ct); 167 168 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) | 169 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24); 170 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val); 171 172 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) | 173 (TOBCD(ct.year - YEAR_BASE) << 16); 174 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val); 175 176 return (0); 177 } 178 179 static uint32_t 180 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off) 181 { 182 183 return (bus_read_4(sc->res[0], off)); 184 } 185 186 static int 187 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val) 188 { 189 190 bus_write_4(sc->res[0], off, val); 191 return (0); 192 } 193