rtc.c revision 1.12
1 /* $NetBSD: rtc.c,v 1.12 2005/01/02 12:03:12 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 1.12 2005/01/02 12:03:12 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 }; 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 uint8_t rtc_readreg(struct rtc_softc *, int); 113 static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); 114 115 116 static int 117 rtcmatch(struct device *parent, struct cfdata *match, void *aux) 118 { 119 struct intio_attach_args *ia = aux; 120 121 if (strcmp("rtc", ia->ia_modname) != 0) 122 return (0); 123 124 return (1); 125 } 126 127 static void 128 rtcattach(struct device *parent, struct device *self, void *aux) 129 { 130 struct intio_attach_args *ia = aux; 131 struct rtc_softc *sc = (struct rtc_softc *)self; 132 struct todr_chip_handle *todr_handle; 133 bus_space_tag_t bst = ia->ia_bst; 134 135 printf("\n"); 136 137 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 138 &sc->sc_bsh)) { 139 printf("%s: can't map registers\n", 140 sc->sc_dev.dv_xname); 141 return; 142 } 143 144 sc->sc_bst = bst; 145 146 MALLOC(todr_handle, struct todr_chip_handle *, 147 sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT); 148 149 todr_handle->cookie = sc; 150 todr_handle->todr_gettime = rtc_gettime; 151 todr_handle->todr_settime = rtc_settime; 152 todr_handle->todr_getcal = rtc_getcal; 153 todr_handle->todr_setcal = rtc_setcal; 154 todr_handle->todr_setwen = NULL; 155 156 todr_attach(todr_handle); 157 } 158 159 static int 160 rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 161 { 162 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 163 int i, read_okay, year; 164 struct clock_ymdhms dt; 165 uint8_t rtc_registers[NUM_RTC_REGS]; 166 167 /* read rtc registers */ 168 read_okay = 0; 169 while (!read_okay) { 170 read_okay = 1; 171 for (i = 0; i < NUM_RTC_REGS; i++) 172 rtc_registers[i] = rtc_readreg(sc, i); 173 for (i = 0; i < NUM_RTC_REGS; i++) 174 if (rtc_registers[i] != rtc_readreg(sc, i)) 175 read_okay = 0; 176 } 177 178 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 179 180 dt.dt_sec = rtc_to_decimal(1, 0); 181 dt.dt_min = rtc_to_decimal(3, 2); 182 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 183 dt.dt_day = rtc_to_decimal(8, 7); 184 dt.dt_mon = rtc_to_decimal(10, 9); 185 186 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 187 if (year < POSIX_BASE_YEAR) 188 year += 100; 189 dt.dt_year = year; 190 191 #undef rtc_to_decimal 192 193 /* simple sanity checks */ 194 if (dt.dt_mon > 12 || dt.dt_day > 31 || 195 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 196 return (1); 197 198 tv->tv_sec = clock_ymdhms_to_secs(&dt); 199 tv->tv_usec = 0; 200 return (0); 201 } 202 203 static int 204 rtc_settime(todr_chip_handle_t handle, struct timeval *tv) 205 { 206 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 207 int i, year; 208 struct clock_ymdhms dt; 209 uint8_t rtc_registers[NUM_RTC_REGS]; 210 211 /* Note: we ignore `tv_usec' */ 212 clock_secs_to_ymdhms(tv->tv_sec, &dt); 213 214 year = dt.dt_year - RTC_BASE_YEAR; 215 if (year > 99) 216 year -= 100; 217 218 #define decimal_to_rtc(a,b,n) \ 219 rtc_registers[a] = (n) % 10; \ 220 rtc_registers[b] = (n) / 10; 221 222 decimal_to_rtc(0, 1, dt.dt_sec); 223 decimal_to_rtc(2, 3, dt.dt_min); 224 decimal_to_rtc(7, 8, dt.dt_day); 225 decimal_to_rtc(9, 10, dt.dt_mon); 226 decimal_to_rtc(11, 12, year); 227 228 rtc_registers[4] = dt.dt_hour % 10; 229 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 230 231 rtc_registers[6] = 0; 232 233 #undef decimal_to_rtc 234 235 /* write rtc registers */ 236 rtc_writereg(sc, 15, 13); /* reset prescalar */ 237 for (i = 0; i < NUM_RTC_REGS; i++) 238 if (rtc_registers[i] != 239 rtc_writereg(sc, i, rtc_registers[i])) 240 return (1); 241 return (0); 242 } 243 244 static int 245 rtc_getcal(todr_chip_handle_t handle, int *vp) 246 { 247 return (EOPNOTSUPP); 248 } 249 250 static int 251 rtc_setcal(todr_chip_handle_t handle, int v) 252 { 253 return (EOPNOTSUPP); 254 } 255 256 static uint8_t 257 rtc_readreg(struct rtc_softc *sc, int reg) 258 { 259 bus_space_tag_t bst = sc->sc_bst; 260 bus_space_handle_t bsh = sc->sc_bsh; 261 uint8_t data; 262 int s = splvm(); 263 264 data = reg; 265 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 266 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 267 268 splx(s); 269 return (data); 270 } 271 272 static uint8_t 273 rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) 274 { 275 bus_space_tag_t bst = sc->sc_bst; 276 bus_space_handle_t bsh = sc->sc_bsh; 277 uint8_t tmp; 278 int s = splvm(); 279 280 tmp = (data << 4) | reg; 281 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 282 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 283 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 284 285 splx(s); 286 return (tmp); 287 } 288
Indexes created Tue Sep 23 23:09:58 GMT 2025