mvsocrtc.c revision 1.5
1 /* $NetBSD: mvsocrtc.c,v 1.5 2025/09/07 21:45:11 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 The NetBSD Foundation, Inc. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Driver for real time clock unit on Marvell kirkwood and possibly other 31 * SoCs. Supports only the time/date keeping functions. No support for 32 * the rtc unit alarm / interrupt functions. 33 * 34 * Written 10/2010 by Brett Slager -- all rights assigned to the NetBSD 35 * Foundation. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: mvsocrtc.c,v 1.5 2025/09/07 21:45:11 thorpej Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/device.h> 44 #include <sys/kernel.h> 45 46 #include <dev/clock_subr.h> 47 48 #include <sys/bus.h> 49 50 #include <arm/marvell/mvsocrtcreg.h> 51 #include <dev/marvell/marvellvar.h> 52 53 struct mvsocrtc_softc { 54 device_t sc_dev; 55 bus_space_tag_t sc_iot; 56 bus_space_handle_t sc_ioh; 57 struct todr_chip_handle sc_todr; 58 }; 59 60 static int mvsocrtc_match(device_t, cfdata_t, void *); 61 static void mvsocrtc_attach(device_t, device_t, void *); 62 static int mvsocrtc_todr_gettime(todr_chip_handle_t, struct clock_ymdhms *); 63 static int mvsocrtc_todr_settime(todr_chip_handle_t, struct clock_ymdhms *); 64 65 CFATTACH_DECL_NEW(mvsocrtc, sizeof(struct mvsocrtc_softc), mvsocrtc_match, 66 mvsocrtc_attach, NULL, NULL); 67 68 static int 69 mvsocrtc_match(device_t parent, cfdata_t cf, void *aux) 70 { 71 struct marvell_attach_args * const mva = aux; 72 73 if (strcmp(mva->mva_name, cf->cf_name) != 0) 74 return 0; 75 if (mva->mva_offset == MVA_OFFSET_DEFAULT) 76 return 0; 77 78 mva->mva_size = MVSOCRTC_SIZE; 79 return 1; 80 } 81 82 static void 83 mvsocrtc_attach(device_t parent, device_t self, void *aux) 84 { 85 struct mvsocrtc_softc * const sc = device_private(self); 86 struct marvell_attach_args * const mva = aux; 87 88 sc->sc_dev = self; 89 sc->sc_iot = mva->mva_iot; 90 91 aprint_normal(": Marvell SoC Real Time Clock\n"); 92 aprint_naive("\n"); 93 94 if (bus_space_subregion(mva->mva_iot, mva->mva_ioh, mva->mva_offset, 95 mva->mva_size, &sc->sc_ioh)) { 96 aprint_error_dev(self, "failed to subregion register space\n"); 97 return; 98 } 99 100 sc->sc_todr.todr_dev = self; 101 sc->sc_todr.todr_gettime_ymdhms = mvsocrtc_todr_gettime; 102 sc->sc_todr.todr_settime_ymdhms = mvsocrtc_todr_settime; 103 104 todr_attach(&sc->sc_todr); 105 } 106 107 static int 108 mvsocrtc_todr_gettime(todr_chip_handle_t ch, struct clock_ymdhms *dt) 109 { 110 struct mvsocrtc_softc * const sc = device_private(ch->todr_dev); 111 bool tried = false; 112 uint32_t rtcdate, rtctime; 113 uint8_t rtcday, rtchour, rtcmin, rtcmonth, rtcsec, rtcyear; 114 115 again: 116 /* read the rtc date and time registers */ 117 rtcdate = bus_space_read_4(sc->sc_iot, sc->sc_ioh, MVSOCRTC_DATE); 118 rtctime = bus_space_read_4(sc->sc_iot, sc->sc_ioh, MVSOCRTC_TIME); 119 120 rtcyear = (rtcdate >> MVSOCRTC_YEAR_OFFSET) & MVSOCRTC_YEAR_MASK; 121 rtcmonth = (rtcdate >> MVSOCRTC_MONTH_OFFSET) & MVSOCRTC_MONTH_MASK; 122 rtcday = (rtcdate >> MVSOCRTC_DAY_OFFSET) & MVSOCRTC_DAY_MASK; 123 124 rtchour = (rtctime >> MVSOCRTC_HOUR_OFFSET) & MVSOCRTC_HOUR_MASK; 125 rtcmin = (rtctime >> MVSOCRTC_MINUTE_OFFSET) & MVSOCRTC_MINUTE_MASK; 126 rtcsec = (rtctime >> MVSOCRTC_SECOND_OFFSET) & MVSOCRTC_SECOND_MASK; 127 128 /* 129 * if seconds == 0, we may have read while the registers were 130 * updating. Read again to get consistant data. 131 */ 132 if (rtcsec == 0 && !tried) { 133 tried = true; 134 goto again; 135 } 136 137 /* 138 * Assume year "00" to be year 2000. 139 * XXXX this assumption will fail in 2100, but somehow I don't think 140 * I or the hardware will be functioning to see it. 141 */ 142 dt->dt_year = bcdtobin(rtcyear) + 2000; 143 dt->dt_mon = bcdtobin(rtcmonth); 144 dt->dt_day = bcdtobin(rtcday); 145 dt->dt_hour = bcdtobin(rtchour); 146 dt->dt_min = bcdtobin(rtcmin); 147 dt->dt_sec = bcdtobin(rtcsec); 148 149 return 0; 150 } 151 152 static int 153 mvsocrtc_todr_settime(todr_chip_handle_t ch, struct clock_ymdhms *dt) 154 { 155 struct mvsocrtc_softc * const sc = device_private(ch->todr_dev); 156 uint32_t reg; 157 158 /* compose & write time register contents */ 159 reg = (bintobcd(dt->dt_sec) << MVSOCRTC_SECOND_OFFSET) | 160 (bintobcd(dt->dt_min) << MVSOCRTC_MINUTE_OFFSET) | 161 (bintobcd(dt->dt_hour) << MVSOCRTC_HOUR_OFFSET) | 162 (bintobcd(dt->dt_wday) << MVSOCRTC_WDAY_OFFSET); 163 164 bus_space_write_4(sc->sc_iot, sc->sc_ioh, MVSOCRTC_TIME, reg); 165 166 /* compose & write date register contents */ 167 reg = (bintobcd(dt->dt_day) << MVSOCRTC_DAY_OFFSET) | 168 (bintobcd(dt->dt_mon) << MVSOCRTC_MONTH_OFFSET) | 169 (bintobcd(dt->dt_year % 100) << MVSOCRTC_YEAR_OFFSET); 170 171 bus_space_write_4(sc->sc_iot, sc->sc_ioh, MVSOCRTC_DATE, reg); 172 173 return 0; 174 } 175
Indexes created Fri Sep 26 20:09:58 GMT 2025