rtc.c revision 1.9
1 /* $NetBSD: rtc.c,v 1.9 2003/08/07 16:27:34 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 36 * 37 * @(#)clock.c 8.2 (Berkeley) 1/12/94 38 */ 39 /* 40 * Copyright (c) 1988 University of Utah. 41 * 42 * This code is derived from software contributed to Berkeley by 43 * the Systems Programming Group of the University of Utah Computer 44 * Science Department. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 75 * 76 * @(#)clock.c 8.2 (Berkeley) 1/12/94 77 */ 78 79 /* 80 * attachment for HP300 real-time clock (RTC) 81 */ 82 83 #include <sys/cdefs.h> 84 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.9 2003/08/07 16:27:34 agc Exp $"); 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/device.h> 89 #include <sys/malloc.h> 90 91 #include <hp300/dev/intiovar.h> 92 #include <hp300/dev/rtcreg.h> 93 94 #include <dev/clock_subr.h> 95 96 struct rtc_softc { 97 struct device sc_dev; 98 bus_space_tag_t sc_bst; 99 bus_space_handle_t sc_bsh; 100 }; 101 102 static int rtcmatch(struct device *, struct cfdata *, void *); 103 static void rtcattach(struct device *, struct device *, void *aux); 104 105 CFATTACH_DECL(rtc, sizeof (struct rtc_softc), 106 rtcmatch, rtcattach, NULL, NULL); 107 108 static int rtc_gettime(todr_chip_handle_t, struct timeval *); 109 static int rtc_settime(todr_chip_handle_t, struct timeval *); 110 static int rtc_getcal(todr_chip_handle_t, int *); 111 static int rtc_setcal(todr_chip_handle_t, int); 112 static u_int8_t rtc_readreg(struct rtc_softc *, int); 113 static u_int8_t rtc_writereg(struct rtc_softc *, int, u_int8_t); 114 115 116 static int 117 rtcmatch(parent, match, aux) 118 struct device *parent; 119 struct cfdata *match; 120 void *aux; 121 { 122 struct intio_attach_args *ia = aux; 123 124 if (strcmp("rtc", ia->ia_modname) != 0) 125 return (0); 126 127 return (1); 128 } 129 130 static void 131 rtcattach(parent, self, aux) 132 struct device *parent, *self; 133 void *aux; 134 { 135 struct intio_attach_args *ia = aux; 136 struct rtc_softc *sc = (struct rtc_softc *)self; 137 struct todr_chip_handle *todr_handle; 138 bus_space_tag_t bst = ia->ia_bst; 139 140 printf("\n"); 141 142 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 143 &sc->sc_bsh)) { 144 printf("%s: can't map registers\n", 145 sc->sc_dev.dv_xname); 146 return; 147 } 148 149 sc->sc_bst = bst; 150 151 MALLOC(todr_handle, struct todr_chip_handle *, 152 sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT); 153 154 todr_handle->cookie = sc; 155 todr_handle->todr_gettime = rtc_gettime; 156 todr_handle->todr_settime = rtc_settime; 157 todr_handle->todr_getcal = rtc_getcal; 158 todr_handle->todr_setcal = rtc_setcal; 159 todr_handle->todr_setwen = NULL; 160 161 todr_attach(todr_handle); 162 } 163 164 static int 165 rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 166 { 167 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 168 int i, read_okay, year; 169 struct clock_ymdhms dt; 170 u_int8_t rtc_registers[NUM_RTC_REGS]; 171 172 /* read rtc registers */ 173 read_okay = 0; 174 while (!read_okay) { 175 read_okay = 1; 176 for (i = 0; i < NUM_RTC_REGS; i++) 177 rtc_registers[i] = rtc_readreg(sc, i); 178 for (i = 0; i < NUM_RTC_REGS; i++) 179 if (rtc_registers[i] != rtc_readreg(sc, i)) 180 read_okay = 0; 181 } 182 183 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 184 185 dt.dt_sec = rtc_to_decimal(1, 0); 186 dt.dt_min = rtc_to_decimal(3, 2); 187 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 188 dt.dt_day = rtc_to_decimal(8, 7); 189 dt.dt_mon = rtc_to_decimal(10, 9); 190 191 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 192 if (year < POSIX_BASE_YEAR) 193 year += 100; 194 dt.dt_year = year; 195 196 #undef rtc_to_decimal 197 198 /* simple sanity checks */ 199 if (dt.dt_mon > 12 || dt.dt_day > 31 || 200 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 201 return (1); 202 203 tv->tv_sec = clock_ymdhms_to_secs(&dt); 204 tv->tv_usec = 0; 205 return (0); 206 } 207 208 static int 209 rtc_settime(todr_chip_handle_t handle, struct timeval *tv) 210 { 211 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 212 int i, year; 213 struct clock_ymdhms dt; 214 u_int8_t rtc_registers[NUM_RTC_REGS]; 215 216 /* Note: we ignore `tv_usec' */ 217 clock_secs_to_ymdhms(tv->tv_sec, &dt); 218 219 year = dt.dt_year - RTC_BASE_YEAR; 220 if (year > 99) 221 year -= 100; 222 223 #define decimal_to_rtc(a,b,n) \ 224 rtc_registers[a] = (n) % 10; \ 225 rtc_registers[b] = (n) / 10; 226 227 decimal_to_rtc(0, 1, dt.dt_sec); 228 decimal_to_rtc(2, 3, dt.dt_min); 229 decimal_to_rtc(7, 8, dt.dt_day); 230 decimal_to_rtc(9, 10, dt.dt_mon); 231 decimal_to_rtc(11, 12, year); 232 233 rtc_registers[4] = dt.dt_hour % 10; 234 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 235 236 rtc_registers[6] = 0; 237 238 #undef decimal_to_rtc 239 240 /* write rtc registers */ 241 rtc_writereg(sc, 15, 13); /* reset prescalar */ 242 for (i = 0; i < NUM_RTC_REGS; i++) 243 if (rtc_registers[i] != 244 rtc_writereg(sc, i, rtc_registers[i])) 245 return (1); 246 return (0); 247 } 248 249 static int 250 rtc_getcal(todr_chip_handle_t handle, int *vp) 251 { 252 return (EOPNOTSUPP); 253 } 254 255 static int 256 rtc_setcal(todr_chip_handle_t handle, int v) 257 { 258 return (EOPNOTSUPP); 259 } 260 261 static u_int8_t 262 rtc_readreg(struct rtc_softc *sc, int reg) 263 { 264 bus_space_tag_t bst = sc->sc_bst; 265 bus_space_handle_t bsh = sc->sc_bsh; 266 u_int8_t data; 267 int s = splvm(); 268 269 data = reg; 270 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 271 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 272 273 splx(s); 274 return (data); 275 } 276 277 static u_int8_t 278 rtc_writereg(struct rtc_softc *sc, int reg, u_int8_t data) 279 { 280 bus_space_tag_t bst = sc->sc_bst; 281 bus_space_handle_t bsh = sc->sc_bsh; 282 u_int8_t tmp; 283 int s = splvm(); 284 285 tmp = (data << 4) | reg; 286 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 287 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 288 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 289 290 splx(s); 291 return (tmp); 292 } 293
Indexes created Mon Sep 22 13:09:51 GMT 2025