rtc.c revision 1.8
1 /* $NetBSD: rtc.c,v 1.8 2003/07/19 02:39:27 tsutsui 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 1.8 2003/07/19 02:39:27 tsutsui 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 62 struct rtc_softc { 63 struct device sc_dev; 64 bus_space_tag_t sc_bst; 65 bus_space_handle_t sc_bsh; 66 }; 67 68 static int rtcmatch(struct device *, struct cfdata *, void *); 69 static void rtcattach(struct device *, struct device *, void *aux); 70 71 CFATTACH_DECL(rtc, sizeof (struct rtc_softc), 72 rtcmatch, rtcattach, NULL, NULL); 73 74 static int rtc_gettime(todr_chip_handle_t, struct timeval *); 75 static int rtc_settime(todr_chip_handle_t, struct timeval *); 76 static int rtc_getcal(todr_chip_handle_t, int *); 77 static int rtc_setcal(todr_chip_handle_t, int); 78 static u_int8_t rtc_readreg(struct rtc_softc *, int); 79 static u_int8_t rtc_writereg(struct rtc_softc *, int, u_int8_t); 80 81 82 static int 83 rtcmatch(parent, match, aux) 84 struct device *parent; 85 struct cfdata *match; 86 void *aux; 87 { 88 struct intio_attach_args *ia = aux; 89 90 if (strcmp("rtc", ia->ia_modname) != 0) 91 return (0); 92 93 return (1); 94 } 95 96 static void 97 rtcattach(parent, self, aux) 98 struct device *parent, *self; 99 void *aux; 100 { 101 struct intio_attach_args *ia = aux; 102 struct rtc_softc *sc = (struct rtc_softc *)self; 103 struct todr_chip_handle *todr_handle; 104 bus_space_tag_t bst = ia->ia_bst; 105 106 printf("\n"); 107 108 if (bus_space_map(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 sc->sc_bst = bst; 116 117 MALLOC(todr_handle, struct todr_chip_handle *, 118 sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT); 119 120 todr_handle->cookie = sc; 121 todr_handle->todr_gettime = rtc_gettime; 122 todr_handle->todr_settime = rtc_settime; 123 todr_handle->todr_getcal = rtc_getcal; 124 todr_handle->todr_setcal = rtc_setcal; 125 todr_handle->todr_setwen = NULL; 126 127 todr_attach(todr_handle); 128 } 129 130 static int 131 rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 132 { 133 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 134 int i, read_okay, year; 135 struct clock_ymdhms dt; 136 u_int8_t rtc_registers[NUM_RTC_REGS]; 137 138 /* read rtc registers */ 139 read_okay = 0; 140 while (!read_okay) { 141 read_okay = 1; 142 for (i = 0; i < NUM_RTC_REGS; i++) 143 rtc_registers[i] = rtc_readreg(sc, i); 144 for (i = 0; i < NUM_RTC_REGS; i++) 145 if (rtc_registers[i] != rtc_readreg(sc, i)) 146 read_okay = 0; 147 } 148 149 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 150 151 dt.dt_sec = rtc_to_decimal(1, 0); 152 dt.dt_min = rtc_to_decimal(3, 2); 153 dt.dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; 154 dt.dt_day = rtc_to_decimal(8, 7); 155 dt.dt_mon = rtc_to_decimal(10, 9); 156 157 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 158 if (year < POSIX_BASE_YEAR) 159 year += 100; 160 dt.dt_year = year; 161 162 #undef rtc_to_decimal 163 164 /* simple sanity checks */ 165 if (dt.dt_mon > 12 || dt.dt_day > 31 || 166 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 167 return (1); 168 169 tv->tv_sec = clock_ymdhms_to_secs(&dt); 170 tv->tv_usec = 0; 171 return (0); 172 } 173 174 static int 175 rtc_settime(todr_chip_handle_t handle, struct timeval *tv) 176 { 177 struct rtc_softc *sc = (struct rtc_softc *)handle->cookie; 178 int i, year; 179 struct clock_ymdhms dt; 180 u_int8_t rtc_registers[NUM_RTC_REGS]; 181 182 /* Note: we ignore `tv_usec' */ 183 clock_secs_to_ymdhms(tv->tv_sec, &dt); 184 185 year = dt.dt_year - RTC_BASE_YEAR; 186 if (year > 99) 187 year -= 100; 188 189 #define decimal_to_rtc(a,b,n) \ 190 rtc_registers[a] = (n) % 10; \ 191 rtc_registers[b] = (n) / 10; 192 193 decimal_to_rtc(0, 1, dt.dt_sec); 194 decimal_to_rtc(2, 3, dt.dt_min); 195 decimal_to_rtc(7, 8, dt.dt_day); 196 decimal_to_rtc(9, 10, dt.dt_mon); 197 decimal_to_rtc(11, 12, year); 198 199 rtc_registers[4] = dt.dt_hour % 10; 200 rtc_registers[5] = ((dt.dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 201 202 rtc_registers[6] = 0; 203 204 #undef decimal_to_rtc 205 206 /* write rtc registers */ 207 rtc_writereg(sc, 15, 13); /* reset prescalar */ 208 for (i = 0; i < NUM_RTC_REGS; i++) 209 if (rtc_registers[i] != 210 rtc_writereg(sc, i, rtc_registers[i])) 211 return (1); 212 return (0); 213 } 214 215 static int 216 rtc_getcal(todr_chip_handle_t handle, int *vp) 217 { 218 return (EOPNOTSUPP); 219 } 220 221 static int 222 rtc_setcal(todr_chip_handle_t handle, int v) 223 { 224 return (EOPNOTSUPP); 225 } 226 227 static u_int8_t 228 rtc_readreg(struct rtc_softc *sc, int reg) 229 { 230 bus_space_tag_t bst = sc->sc_bst; 231 bus_space_handle_t bsh = sc->sc_bsh; 232 u_int8_t data; 233 int s = splvm(); 234 235 data = reg; 236 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 237 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 238 239 splx(s); 240 return (data); 241 } 242 243 static u_int8_t 244 rtc_writereg(struct rtc_softc *sc, int reg, u_int8_t data) 245 { 246 bus_space_tag_t bst = sc->sc_bst; 247 bus_space_handle_t bsh = sc->sc_bsh; 248 u_int8_t tmp; 249 int s = splvm(); 250 251 tmp = (data << 4) | reg; 252 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 253 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 254 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 255 256 splx(s); 257 return (tmp); 258 } 259
Indexes created Thu Sep 25 08:09:54 GMT 2025