rtc.c revision 1.3
1 /* $NetBSD: rtc.c,v 1.3 2002/03/15 05:52:54 gmcgarry 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 1.3 2002/03/15 05:52:54 gmcgarry 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 struct cfattach rtc_ca = { 73 sizeof (struct rtc_softc), rtcmatch, rtcattach, 74 }; 75 76 static int rtc_gettime(todr_chip_handle_t, struct timeval *); 77 static int rtc_settime(todr_chip_handle_t, struct timeval *); 78 static int rtc_getcal(todr_chip_handle_t, int *); 79 static int rtc_setcal(todr_chip_handle_t, int); 80 static u_int8_t rtc_readreg(struct rtc_softc *, int); 81 static u_int8_t rtc_writereg(struct rtc_softc *, int, u_int8_t); 82 83 84 static int 85 rtcmatch(parent, match, aux) 86 struct device *parent; 87 struct cfdata *match; 88 void *aux; 89 { 90 struct intio_attach_args *ia = aux; 91 92 if (strcmp("rtc ", ia->ia_modname) != 0) 93 return (0); 94 95 return (1); 96 } 97 98 static void 99 rtcattach(parent, self, aux) 100 struct device *parent, *self; 101 void *aux; 102 { 103 struct intio_attach_args *ia = aux; 104 struct rtc_softc *sc = (struct rtc_softc *)self; 105 struct todr_chip_handle *todr_handle; 106 107 printf("\n"); 108 109 if (bus_space_map(ia->ia_bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 110 &sc->sc_bsh)) { 111 printf("%s: can't map registers\n", 112 sc->sc_dev.dv_xname); 113 return; 114 } 115 116 MALLOC(todr_handle, struct todr_chip_handle *, 117 sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT); 118 119 todr_handle->cookie = sc; 120 todr_handle->todr_gettime = rtc_gettime; 121 todr_handle->todr_settime = rtc_settime; 122 todr_handle->todr_getcal = rtc_getcal; 123 todr_handle->todr_setcal = rtc_setcal; 124 todr_handle->todr_setwen = NULL; 125 126 clockattach(todr_handle); 127 } 128 129 static int 130 rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 131 { 132 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 133 int i, read_okay, year; 134 struct clock_ymdhms dt; 135 u_int8_t rtc_registers[NUM_RTC_REGS]; 136 137 /* read rtc registers */ 138 read_okay = 0; 139 while (!read_okay) { 140 read_okay = 1; 141 for (i = 0; i < NUM_RTC_REGS; i++) 142 rtc_registers[i] = rtc_readreg(sc, i); 143 for (i = 0; i < NUM_RTC_REGS; i++) 144 if (rtc_registers[i] != rtc_readreg(sc, i)) 145 read_okay = 0; 146 } 147 148 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 149 150 dt.dt_sec = rtc_to_decimal(1, 0); 151 dt.dt_min = rtc_to_decimal(3, 2); 152 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 153 dt.dt_day = rtc_to_decimal(8, 7); 154 dt.dt_mon = rtc_to_decimal(10, 9); 155 156 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 157 if (year < POSIX_BASE_YEAR) 158 year += 100; 159 dt.dt_year = year; 160 161 #undef rtc_to_decimal 162 163 /* simple sanity checks */ 164 if (dt.dt_mon > 12 || dt.dt_day > 31 || 165 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 166 return (1); 167 168 tv->tv_sec = clock_ymdhms_to_secs(&dt); 169 tv->tv_usec = 0; 170 return (0); 171 } 172 173 static int 174 rtc_settime(todr_chip_handle_t handle, struct timeval *tv) 175 { 176 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 177 int i, year; 178 struct clock_ymdhms dt; 179 u_int8_t rtc_registers[NUM_RTC_REGS]; 180 181 /* Note: we ignore `tv_usec' */ 182 clock_secs_to_ymdhms(tv->tv_sec, &dt); 183 184 year = dt.dt_year - RTC_BASE_YEAR; 185 if (year > 99) 186 year -= 100; 187 188 #define decimal_to_rtc(a,b,n) \ 189 rtc_registers[a] = (n) % 10; \ 190 rtc_registers[b] = (n) / 10; 191 192 decimal_to_rtc(0, 1, dt.dt_sec); 193 decimal_to_rtc(2, 3, dt.dt_min); 194 decimal_to_rtc(7, 8, dt.dt_day); 195 decimal_to_rtc(9, 10, dt.dt_mon); 196 decimal_to_rtc(11, 12, year); 197 198 rtc_registers[4] = dt.dt_hour % 10; 199 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 200 201 rtc_registers[6] = 0; 202 203 #undef decimal_to_rtc 204 205 /* write rtc registers */ 206 rtc_writereg(sc, 15, 13); /* reset prescalar */ 207 for (i = 0; i < NUM_RTC_REGS; i++) 208 if (rtc_registers[i] != 209 rtc_writereg(sc, i, rtc_registers[i])) 210 return (1); 211 return (0); 212 } 213 214 static int 215 rtc_getcal(todr_chip_handle_t handle, int *vp) 216 { 217 return (EOPNOTSUPP); 218 } 219 220 static int 221 rtc_setcal(todr_chip_handle_t handle, int v) 222 { 223 return (EOPNOTSUPP); 224 } 225 226 static u_int8_t 227 rtc_readreg(struct rtc_softc *sc, int reg) 228 { 229 bus_space_tag_t bst = sc->sc_bst; 230 bus_space_handle_t bsh = sc->sc_bsh; 231 u_int8_t data; 232 int s = splvm(); 233 234 data = reg; 235 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 236 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 237 238 splx(s); 239 return (data); 240 } 241 242 static u_int8_t 243 rtc_writereg(struct rtc_softc *sc, int reg, u_int8_t data) 244 { 245 bus_space_tag_t bst = sc->sc_bst; 246 bus_space_handle_t bsh = sc->sc_bsh; 247 u_int8_t tmp; 248 int s = splvm(); 249 250 tmp = (data << 4) | reg; 251 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 252 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 253 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 254 255 splx(s); 256 return (tmp); 257 } 258
Indexes created Tue Sep 23 02:09:52 GMT 2025