rtc.c revision 1.22
1 /* $NetBSD: rtc.c,v 1.22 2023/01/15 06:19:45 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 37 * 38 * @(#)clock.c 8.2 (Berkeley) 1/12/94 39 */ 40 41 /* 42 * attachment for HP300 real-time clock (RTC) 43 */ 44 45 #include <sys/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.22 2023/01/15 06:19:45 tsutsui Exp $"); 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/device.h> 51 #include <sys/malloc.h> 52 53 #include <hp300/dev/intiovar.h> 54 #include <hp300/dev/rtcreg.h> 55 56 #include <dev/clock_subr.h> 57 58 struct rtc_softc { 59 device_t sc_dev; 60 bus_space_tag_t sc_bst; 61 bus_space_handle_t sc_bsh; 62 struct todr_chip_handle sc_handle; 63 }; 64 65 static int rtcmatch(device_t, cfdata_t, void *); 66 static void rtcattach(device_t, device_t, void *aux); 67 68 CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc), 69 rtcmatch, rtcattach, NULL, NULL); 70 71 static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 72 static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 73 static uint8_t rtc_readreg(struct rtc_softc *, int); 74 static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); 75 76 77 static int 78 rtcmatch(device_t parent, cfdata_t cf, void *aux) 79 { 80 struct intio_attach_args *ia = aux; 81 82 /* 425e doesn't have the traditional RTC at intio */ 83 if (machineid == HP_425 && mmuid == MMUID_425_E) 84 return 0; 85 86 if (strcmp("rtc", ia->ia_modname) != 0) 87 return 0; 88 89 return 1; 90 } 91 92 static void 93 rtcattach(device_t parent, device_t self, void *aux) 94 { 95 struct rtc_softc *sc = device_private(self); 96 struct intio_attach_args *ia = aux; 97 struct todr_chip_handle *todr_handle; 98 bus_space_tag_t bst = ia->ia_bst; 99 100 sc->sc_dev = self; 101 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 102 &sc->sc_bsh)) { 103 aprint_error(": can't map registers\n"); 104 return; 105 } 106 107 aprint_normal("\n"); 108 109 sc->sc_bst = bst; 110 111 todr_handle = &sc->sc_handle; 112 todr_handle->cookie = sc; 113 todr_handle->todr_gettime = NULL; 114 todr_handle->todr_settime = NULL; 115 todr_handle->todr_gettime_ymdhms = rtc_gettime_ymdhms; 116 todr_handle->todr_settime_ymdhms = rtc_settime_ymdhms; 117 todr_handle->todr_setwen = NULL; 118 119 todr_attach(todr_handle); 120 } 121 122 static int 123 rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 124 { 125 struct rtc_softc *sc; 126 int i, year; 127 bool read_okay; 128 uint8_t rtc_registers[NUM_RTC_REGS]; 129 130 sc = handle->cookie; 131 132 /* read rtc registers */ 133 read_okay = false; 134 while (!read_okay) { 135 read_okay = true; 136 for (i = 0; i < NUM_RTC_REGS; i++) 137 rtc_registers[i] = rtc_readreg(sc, i); 138 for (i = 0; i < NUM_RTC_REGS; i++) 139 if (rtc_registers[i] != rtc_readreg(sc, i)) 140 read_okay = false; 141 } 142 143 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 144 145 dt->dt_sec = rtc_to_decimal(1, 0); 146 dt->dt_min = rtc_to_decimal(3, 2); 147 dt->dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + 148 rtc_registers[4]; 149 dt->dt_day = rtc_to_decimal(8, 7); 150 dt->dt_mon = rtc_to_decimal(10, 9); 151 152 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 153 if (year < POSIX_BASE_YEAR) 154 year += 100; 155 dt->dt_year = year; 156 157 #undef rtc_to_decimal 158 159 return 0; 160 } 161 162 static int 163 rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 164 { 165 struct rtc_softc *sc; 166 int i, year; 167 uint8_t rtc_registers[NUM_RTC_REGS]; 168 169 sc = handle->cookie; 170 year = dt->dt_year - RTC_BASE_YEAR; 171 if (year > 99) 172 year -= 100; 173 174 #define decimal_to_rtc(a,b,n) \ 175 rtc_registers[a] = (n) % 10; \ 176 rtc_registers[b] = (n) / 10; 177 178 decimal_to_rtc(0, 1, dt->dt_sec); 179 decimal_to_rtc(2, 3, dt->dt_min); 180 decimal_to_rtc(7, 8, dt->dt_day); 181 decimal_to_rtc(9, 10, dt->dt_mon); 182 decimal_to_rtc(11, 12, year); 183 184 rtc_registers[4] = dt->dt_hour % 10; 185 rtc_registers[5] = ((dt->dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 186 187 rtc_registers[6] = 0; 188 189 #undef decimal_to_rtc 190 191 /* write rtc registers */ 192 rtc_writereg(sc, 15, 13); /* reset prescalar */ 193 for (i = 0; i < NUM_RTC_REGS; i++) 194 if (rtc_registers[i] != 195 rtc_writereg(sc, i, rtc_registers[i])) 196 return 1; 197 return 0; 198 } 199 200 static uint8_t 201 rtc_readreg(struct rtc_softc *sc, int reg) 202 { 203 bus_space_tag_t bst = sc->sc_bst; 204 bus_space_handle_t bsh = sc->sc_bsh; 205 uint8_t data; 206 int s = splvm(); 207 208 data = reg; 209 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 210 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 211 212 splx(s); 213 return data; 214 } 215 216 static uint8_t 217 rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) 218 { 219 bus_space_tag_t bst = sc->sc_bst; 220 bus_space_handle_t bsh = sc->sc_bsh; 221 uint8_t tmp; 222 int s = splvm(); 223 224 tmp = (data << 4) | reg; 225 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 226 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 227 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 228 229 splx(s); 230 return tmp; 231 } 232
Indexes created Tue Sep 23 14:10:03 GMT 2025