rtc.c revision 1.16
1 /* $NetBSD: rtc.c,v 1.16 2006/07/21 10:01:39 tsutsui 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 1.16 2006/07/21 10:01:39 tsutsui 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 struct todr_chip_handle sc_handle; 101 }; 102 103 static int rtcmatch(struct device *, struct cfdata *, void *); 104 static void rtcattach(struct device *, struct device *, void *aux); 105 106 CFATTACH_DECL(rtc, sizeof (struct rtc_softc), 107 rtcmatch, rtcattach, NULL, NULL); 108 109 static int rtc_gettime(todr_chip_handle_t, volatile struct timeval *); 110 static int rtc_settime(todr_chip_handle_t, volatile struct timeval *); 111 static int rtc_getcal(todr_chip_handle_t, int *); 112 static int rtc_setcal(todr_chip_handle_t, int); 113 static uint8_t rtc_readreg(struct rtc_softc *, int); 114 static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); 115 116 117 static int 118 rtcmatch(struct device *parent, struct cfdata *match, void *aux) 119 { 120 struct intio_attach_args *ia = aux; 121 122 if (strcmp("rtc", ia->ia_modname) != 0) 123 return 0; 124 125 return 1; 126 } 127 128 static void 129 rtcattach(struct device *parent, struct device *self, void *aux) 130 { 131 struct intio_attach_args *ia = aux; 132 struct rtc_softc *sc = (struct rtc_softc *)self; 133 struct todr_chip_handle *todr_handle; 134 bus_space_tag_t bst = ia->ia_bst; 135 136 printf("\n"); 137 138 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 139 &sc->sc_bsh)) { 140 printf("%s: can't map registers\n", 141 sc->sc_dev.dv_xname); 142 return; 143 } 144 145 sc->sc_bst = bst; 146 147 todr_handle = &sc->sc_handle; 148 todr_handle->cookie = sc; 149 todr_handle->todr_gettime = rtc_gettime; 150 todr_handle->todr_settime = rtc_settime; 151 todr_handle->todr_getcal = rtc_getcal; 152 todr_handle->todr_setcal = rtc_setcal; 153 todr_handle->todr_setwen = NULL; 154 155 todr_attach(todr_handle); 156 } 157 158 static int 159 rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv) 160 { 161 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 162 int i, read_okay, year; 163 struct clock_ymdhms dt; 164 uint8_t rtc_registers[NUM_RTC_REGS]; 165 166 /* read rtc registers */ 167 read_okay = 0; 168 while (!read_okay) { 169 read_okay = 1; 170 for (i = 0; i < NUM_RTC_REGS; i++) 171 rtc_registers[i] = rtc_readreg(sc, i); 172 for (i = 0; i < NUM_RTC_REGS; i++) 173 if (rtc_registers[i] != rtc_readreg(sc, i)) 174 read_okay = 0; 175 } 176 177 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 178 179 dt.dt_sec = rtc_to_decimal(1, 0); 180 dt.dt_min = rtc_to_decimal(3, 2); 181 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 182 dt.dt_day = rtc_to_decimal(8, 7); 183 dt.dt_mon = rtc_to_decimal(10, 9); 184 185 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 186 if (year < POSIX_BASE_YEAR) 187 year += 100; 188 dt.dt_year = year; 189 190 #undef rtc_to_decimal 191 192 /* simple sanity checks */ 193 if (dt.dt_mon > 12 || dt.dt_day > 31 || 194 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 195 return 1; 196 197 tv->tv_sec = clock_ymdhms_to_secs(&dt); 198 tv->tv_usec = 0; 199 return 0; 200 } 201 202 static int 203 rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv) 204 { 205 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 206 int i, year; 207 struct clock_ymdhms dt; 208 uint8_t rtc_registers[NUM_RTC_REGS]; 209 210 /* Note: we ignore `tv_usec' */ 211 clock_secs_to_ymdhms(tv->tv_sec, &dt); 212 213 year = dt.dt_year - RTC_BASE_YEAR; 214 if (year > 99) 215 year -= 100; 216 217 #define decimal_to_rtc(a,b,n) \ 218 rtc_registers[a] = (n) % 10; \ 219 rtc_registers[b] = (n) / 10; 220 221 decimal_to_rtc(0, 1, dt.dt_sec); 222 decimal_to_rtc(2, 3, dt.dt_min); 223 decimal_to_rtc(7, 8, dt.dt_day); 224 decimal_to_rtc(9, 10, dt.dt_mon); 225 decimal_to_rtc(11, 12, year); 226 227 rtc_registers[4] = dt.dt_hour % 10; 228 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 229 230 rtc_registers[6] = 0; 231 232 #undef decimal_to_rtc 233 234 /* write rtc registers */ 235 rtc_writereg(sc, 15, 13); /* reset prescalar */ 236 for (i = 0; i < NUM_RTC_REGS; i++) 237 if (rtc_registers[i] != 238 rtc_writereg(sc, i, rtc_registers[i])) 239 return 1; 240 return 0; 241 } 242 243 static int 244 rtc_getcal(todr_chip_handle_t handle, int *vp) 245 { 246 247 return EOPNOTSUPP; 248 } 249 250 static int 251 rtc_setcal(todr_chip_handle_t handle, int v) 252 { 253 254 return EOPNOTSUPP; 255 } 256 257 static uint8_t 258 rtc_readreg(struct rtc_softc *sc, int reg) 259 { 260 bus_space_tag_t bst = sc->sc_bst; 261 bus_space_handle_t bsh = sc->sc_bsh; 262 uint8_t data; 263 int s = splvm(); 264 265 data = reg; 266 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 267 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 268 269 splx(s); 270 return data; 271 } 272 273 static uint8_t 274 rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) 275 { 276 bus_space_tag_t bst = sc->sc_bst; 277 bus_space_handle_t bsh = sc->sc_bsh; 278 uint8_t tmp; 279 int s = splvm(); 280 281 tmp = (data << 4) | reg; 282 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 283 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 284 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 285 286 splx(s); 287 return tmp; 288 } 289
Indexes created Mon Sep 22 21:09:42 GMT 2025