rtc.c revision 1.6
1 /* $NetBSD: rtc.c,v 1.6 2002/10/02 05:15:54 thorpej 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 41 * 42 * @(#)clock.c 8.2 (Berkeley) 1/12/94 43 */ 44 45 /* 46 * attachment for HP300 real-time clock (RTC) 47 */ 48 49 #include <sys/cdefs.h> 50 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.6 2002/10/02 05:15:54 thorpej Exp $"); 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/device.h> 55 #include <sys/malloc.h> 56 57 #include <hp300/dev/intiovar.h> 58 #include <hp300/dev/rtcreg.h> 59 60 #include <dev/clock_subr.h> 61 #include <hp300/hp300/clockvar.h> 62 63 struct rtc_softc { 64 struct device sc_dev; 65 bus_space_tag_t sc_bst; 66 bus_space_handle_t sc_bsh; 67 }; 68 69 static int rtcmatch(struct device *, struct cfdata *, void *); 70 static void rtcattach(struct device *, struct device *, void *aux); 71 72 CFATTACH_DECL(rtc, sizeof (struct rtc_softc), 73 rtcmatch, rtcattach, NULL, NULL); 74 75 static int rtc_gettime(todr_chip_handle_t, struct timeval *); 76 static int rtc_settime(todr_chip_handle_t, struct timeval *); 77 static int rtc_getcal(todr_chip_handle_t, int *); 78 static int rtc_setcal(todr_chip_handle_t, int); 79 static u_int8_t rtc_readreg(struct rtc_softc *, int); 80 static u_int8_t rtc_writereg(struct rtc_softc *, int, u_int8_t); 81 82 83 static int 84 rtcmatch(parent, match, aux) 85 struct device *parent; 86 struct cfdata *match; 87 void *aux; 88 { 89 struct intio_attach_args *ia = aux; 90 91 if (strcmp("rtc", ia->ia_modname) != 0) 92 return (0); 93 94 return (1); 95 } 96 97 static void 98 rtcattach(parent, self, aux) 99 struct device *parent, *self; 100 void *aux; 101 { 102 struct intio_attach_args *ia = aux; 103 struct rtc_softc *sc = (struct rtc_softc *)self; 104 struct todr_chip_handle *todr_handle; 105 106 printf("\n"); 107 108 if (bus_space_map(ia->ia_bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 109 &sc->sc_bsh)) { 110 printf("%s: can't map registers\n", 111 sc->sc_dev.dv_xname); 112 return; 113 } 114 115 MALLOC(todr_handle, struct todr_chip_handle *, 116 sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT); 117 118 todr_handle->cookie = sc; 119 todr_handle->todr_gettime = rtc_gettime; 120 todr_handle->todr_settime = rtc_settime; 121 todr_handle->todr_getcal = rtc_getcal; 122 todr_handle->todr_setcal = rtc_setcal; 123 todr_handle->todr_setwen = NULL; 124 125 clockattach(todr_handle); 126 } 127 128 static int 129 rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 130 { 131 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 132 int i, read_okay, year; 133 struct clock_ymdhms dt; 134 u_int8_t rtc_registers[NUM_RTC_REGS]; 135 136 /* read rtc registers */ 137 read_okay = 0; 138 while (!read_okay) { 139 read_okay = 1; 140 for (i = 0; i < NUM_RTC_REGS; i++) 141 rtc_registers[i] = rtc_readreg(sc, i); 142 for (i = 0; i < NUM_RTC_REGS; i++) 143 if (rtc_registers[i] != rtc_readreg(sc, i)) 144 read_okay = 0; 145 } 146 147 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 148 149 dt.dt_sec = rtc_to_decimal(1, 0); 150 dt.dt_min = rtc_to_decimal(3, 2); 151 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 152 dt.dt_day = rtc_to_decimal(8, 7); 153 dt.dt_mon = rtc_to_decimal(10, 9); 154 155 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 156 if (year < POSIX_BASE_YEAR) 157 year += 100; 158 dt.dt_year = year; 159 160 #undef rtc_to_decimal 161 162 /* simple sanity checks */ 163 if (dt.dt_mon > 12 || dt.dt_day > 31 || 164 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 165 return (1); 166 167 tv->tv_sec = clock_ymdhms_to_secs(&dt); 168 tv->tv_usec = 0; 169 return (0); 170 } 171 172 static int 173 rtc_settime(todr_chip_handle_t handle, struct timeval *tv) 174 { 175 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 176 int i, year; 177 struct clock_ymdhms dt; 178 u_int8_t rtc_registers[NUM_RTC_REGS]; 179 180 /* Note: we ignore `tv_usec' */ 181 clock_secs_to_ymdhms(tv->tv_sec, &dt); 182 183 year = dt.dt_year - RTC_BASE_YEAR; 184 if (year > 99) 185 year -= 100; 186 187 #define decimal_to_rtc(a,b,n) \ 188 rtc_registers[a] = (n) % 10; \ 189 rtc_registers[b] = (n) / 10; 190 191 decimal_to_rtc(0, 1, dt.dt_sec); 192 decimal_to_rtc(2, 3, dt.dt_min); 193 decimal_to_rtc(7, 8, dt.dt_day); 194 decimal_to_rtc(9, 10, dt.dt_mon); 195 decimal_to_rtc(11, 12, year); 196 197 rtc_registers[4] = dt.dt_hour % 10; 198 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 199 200 rtc_registers[6] = 0; 201 202 #undef decimal_to_rtc 203 204 /* write rtc registers */ 205 rtc_writereg(sc, 15, 13); /* reset prescalar */ 206 for (i = 0; i < NUM_RTC_REGS; i++) 207 if (rtc_registers[i] != 208 rtc_writereg(sc, i, rtc_registers[i])) 209 return (1); 210 return (0); 211 } 212 213 static int 214 rtc_getcal(todr_chip_handle_t handle, int *vp) 215 { 216 return (EOPNOTSUPP); 217 } 218 219 static int 220 rtc_setcal(todr_chip_handle_t handle, int v) 221 { 222 return (EOPNOTSUPP); 223 } 224 225 static u_int8_t 226 rtc_readreg(struct rtc_softc *sc, int reg) 227 { 228 bus_space_tag_t bst = sc->sc_bst; 229 bus_space_handle_t bsh = sc->sc_bsh; 230 u_int8_t data; 231 int s = splvm(); 232 233 data = reg; 234 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 235 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 236 237 splx(s); 238 return (data); 239 } 240 241 static u_int8_t 242 rtc_writereg(struct rtc_softc *sc, int reg, u_int8_t data) 243 { 244 bus_space_tag_t bst = sc->sc_bst; 245 bus_space_handle_t bsh = sc->sc_bsh; 246 u_int8_t tmp; 247 int s = splvm(); 248 249 tmp = (data << 4) | reg; 250 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 251 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 252 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 253 254 splx(s); 255 return (tmp); 256 } 257
Indexes created Fri Sep 26 08:10:20 GMT 2025