rtc.c revision 1.14.2.1
1 /* $NetBSD: rtc.c,v 1.14.2.1 2006/12/30 20:45:56 yamt 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 1.14.2.1 2006/12/30 20:45:56 yamt 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 uint8_t rtc_readreg(struct rtc_softc *, int); 112 static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); 113 114 115 static int 116 rtcmatch(struct device *parent, struct cfdata *match, void *aux) 117 { 118 struct intio_attach_args *ia = aux; 119 120 if (strcmp("rtc", ia->ia_modname) != 0) 121 return 0; 122 123 return 1; 124 } 125 126 static void 127 rtcattach(struct device *parent, struct device *self, void *aux) 128 { 129 struct intio_attach_args *ia = aux; 130 struct rtc_softc *sc = (struct rtc_softc *)self; 131 struct todr_chip_handle *todr_handle; 132 bus_space_tag_t bst = ia->ia_bst; 133 134 printf("\n"); 135 136 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 137 &sc->sc_bsh)) { 138 printf("%s: can't map registers\n", 139 sc->sc_dev.dv_xname); 140 return; 141 } 142 143 sc->sc_bst = bst; 144 145 todr_handle = &sc->sc_handle; 146 todr_handle->cookie = sc; 147 todr_handle->todr_gettime = rtc_gettime; 148 todr_handle->todr_settime = rtc_settime; 149 todr_handle->todr_setwen = NULL; 150 151 todr_attach(todr_handle); 152 } 153 154 static int 155 rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv) 156 { 157 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 158 int i, read_okay, year; 159 struct clock_ymdhms dt; 160 uint8_t rtc_registers[NUM_RTC_REGS]; 161 162 /* read rtc registers */ 163 read_okay = 0; 164 while (!read_okay) { 165 read_okay = 1; 166 for (i = 0; i < NUM_RTC_REGS; i++) 167 rtc_registers[i] = rtc_readreg(sc, i); 168 for (i = 0; i < NUM_RTC_REGS; i++) 169 if (rtc_registers[i] != rtc_readreg(sc, i)) 170 read_okay = 0; 171 } 172 173 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 174 175 dt.dt_sec = rtc_to_decimal(1, 0); 176 dt.dt_min = rtc_to_decimal(3, 2); 177 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 178 dt.dt_day = rtc_to_decimal(8, 7); 179 dt.dt_mon = rtc_to_decimal(10, 9); 180 181 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 182 if (year < POSIX_BASE_YEAR) 183 year += 100; 184 dt.dt_year = year; 185 186 #undef rtc_to_decimal 187 188 /* simple sanity checks */ 189 if (dt.dt_mon > 12 || dt.dt_day > 31 || 190 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 191 return 1; 192 193 tv->tv_sec = clock_ymdhms_to_secs(&dt); 194 tv->tv_usec = 0; 195 return 0; 196 } 197 198 static int 199 rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv) 200 { 201 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 202 int i, year; 203 struct clock_ymdhms dt; 204 uint8_t rtc_registers[NUM_RTC_REGS]; 205 206 /* Note: we ignore `tv_usec' */ 207 clock_secs_to_ymdhms(tv->tv_sec, &dt); 208 209 year = dt.dt_year - RTC_BASE_YEAR; 210 if (year > 99) 211 year -= 100; 212 213 #define decimal_to_rtc(a,b,n) \ 214 rtc_registers[a] = (n) % 10; \ 215 rtc_registers[b] = (n) / 10; 216 217 decimal_to_rtc(0, 1, dt.dt_sec); 218 decimal_to_rtc(2, 3, dt.dt_min); 219 decimal_to_rtc(7, 8, dt.dt_day); 220 decimal_to_rtc(9, 10, dt.dt_mon); 221 decimal_to_rtc(11, 12, year); 222 223 rtc_registers[4] = dt.dt_hour % 10; 224 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 225 226 rtc_registers[6] = 0; 227 228 #undef decimal_to_rtc 229 230 /* write rtc registers */ 231 rtc_writereg(sc, 15, 13); /* reset prescalar */ 232 for (i = 0; i < NUM_RTC_REGS; i++) 233 if (rtc_registers[i] != 234 rtc_writereg(sc, i, rtc_registers[i])) 235 return 1; 236 return 0; 237 } 238 239 static uint8_t 240 rtc_readreg(struct rtc_softc *sc, int reg) 241 { 242 bus_space_tag_t bst = sc->sc_bst; 243 bus_space_handle_t bsh = sc->sc_bsh; 244 uint8_t data; 245 int s = splvm(); 246 247 data = reg; 248 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 249 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 250 251 splx(s); 252 return data; 253 } 254 255 static uint8_t 256 rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) 257 { 258 bus_space_tag_t bst = sc->sc_bst; 259 bus_space_handle_t bsh = sc->sc_bsh; 260 uint8_t tmp; 261 int s = splvm(); 262 263 tmp = (data << 4) | reg; 264 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 265 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 266 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 267 268 splx(s); 269 return tmp; 270 } 271
Indexes created Sat Oct 11 14:09:46 GMT 2025