rtc.c revision 1.2
1 /* $NetBSD: rtc.c,v 1.2 2002/02/18 04:52:26 uwe Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Valeriy E. Ushakov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* 31 * `rtc' is a DS1287A (== MC146818A) time-of-day clock at EBus. 32 * In Krups it's not used to store idprom so this driver doesn't 33 * support it. Don't know about other ms-IIep systems. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/device.h> 39 #include <sys/malloc.h> 40 #include <sys/systm.h> 41 #ifdef GPROF 42 #include <sys/gmon.h> 43 #endif 44 45 #include <machine/bus.h> 46 #include <machine/autoconf.h> 47 48 #include <dev/clock_subr.h> 49 #include <dev/ic/mc146818reg.h> 50 51 #include <dev/ebus/ebusreg.h> 52 #include <dev/ebus/ebusvar.h> 53 54 struct rtc_ebus_softc { 55 struct device sc_dev; 56 57 bus_space_tag_t sc_bt; /* parent bus tag */ 58 bus_space_handle_t sc_bh; /* handle for registers */ 59 }; 60 61 static int rtcmatch_ebus(struct device *, struct cfdata *, void *); 62 static void rtcattach_ebus(struct device *, struct device *, void *); 63 64 struct cfattach rtc_ebus_ca = { 65 sizeof(struct rtc_ebus_softc), rtcmatch_ebus, rtcattach_ebus 66 }; 67 68 69 /* XXX: global TOD clock handle (sparc/clock.c) */ 70 extern todr_chip_handle_t todr_handle; 71 72 /* todr(9) methods */ 73 int rtc_gettime(todr_chip_handle_t, struct timeval *); 74 int rtc_settime(todr_chip_handle_t, struct timeval *); 75 int rtc_getcal(todr_chip_handle_t, int *); 76 int rtc_setcal(todr_chip_handle_t, int); 77 78 int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */ 79 80 81 /* 82 * MD read/write functions declared in mc146818reg.h 83 */ 84 #define RTC_ADDR 0 85 #define RTC_DATA 1 86 87 u_int 88 mc146818_read(cookie, reg) 89 void *cookie; 90 u_int reg; 91 { 92 struct rtc_ebus_softc *sc = cookie; 93 94 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 95 return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); 96 } 97 98 void 99 mc146818_write(cookie, reg, datum) 100 void *cookie; 101 u_int reg; 102 u_int datum; 103 { 104 struct rtc_ebus_softc *sc = cookie; 105 106 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 107 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); 108 } 109 110 111 static int 112 rtcmatch_ebus(parent, cf, aux) 113 struct device *parent; 114 struct cfdata *cf; 115 void *aux; 116 { 117 struct ebus_attach_args *ea = aux; 118 119 return (strcmp(cf->cf_driver->cd_name, ea->ea_name) == 0); 120 } 121 122 static void 123 rtcattach_ebus(parent, self, aux) 124 struct device *parent; 125 struct device *self; 126 void *aux; 127 { 128 struct rtc_ebus_softc *sc = (void *)self; 129 struct ebus_attach_args *ea = aux; 130 131 todr_chip_handle_t handle; 132 133 sc->sc_bt = ea->ea_bustag; 134 if (ebus_bus_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 135 ea->ea_reg[0].size, 0, 0, &sc->sc_bh) != 0) 136 { 137 printf(": can't map registers\n", self->dv_xname); 138 return; 139 } 140 141 /* XXX: no "model" property in Krups */ 142 printf(": time-of-day clock\n"); 143 144 /* 145 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 146 * (although they shouldn't be wired to an interrupt 147 * controller on sparcs). 148 */ 149 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 150 151 /* setup our todr_handle */ 152 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 153 M_DEVBUF, M_NOWAIT); 154 155 handle->cookie = sc; 156 handle->bus_cookie = NULL; /* unused */ 157 handle->todr_gettime = rtc_gettime; 158 handle->todr_settime = rtc_settime; 159 handle->todr_getcal = rtc_getcal; 160 handle->todr_setcal = rtc_setcal; 161 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 162 163 todr_handle = handle; 164 } 165 166 167 /* 168 * Get time-of-day and convert to a `struct timeval' 169 * Return 0 on success; an error number otherwise. 170 */ 171 int 172 rtc_gettime(handle, tv) 173 todr_chip_handle_t handle; 174 struct timeval *tv; 175 { 176 struct rtc_ebus_softc *sc = handle->cookie; 177 struct clock_ymdhms dt; 178 u_int year; 179 180 /* update in progress; spin loop */ 181 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 182 continue; 183 184 /* stop updates (XXX: do we need that???) */ 185 mc146818_write(sc, MC_REGB, 186 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 187 188 /* read time */ 189 dt.dt_sec = mc146818_read(sc, MC_SEC); 190 dt.dt_min = mc146818_read(sc, MC_MIN); 191 dt.dt_hour = mc146818_read(sc, MC_HOUR); 192 dt.dt_day = mc146818_read(sc, MC_DOM); 193 dt.dt_mon = mc146818_read(sc, MC_MONTH); 194 year = mc146818_read(sc, MC_YEAR); 195 196 /* reenable updates */ 197 mc146818_write(sc, MC_REGB, 198 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 199 200 /* year in the century 0..99: adjust to AD */ 201 year += 1900; 202 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 203 year += 100; 204 dt.dt_year = year; 205 206 /* simple sanity checks */ 207 if (dt.dt_mon > 12 || dt.dt_day > 31 208 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 209 return (ERANGE); 210 211 tv->tv_sec = clock_ymdhms_to_secs(&dt); 212 tv->tv_usec = 0; 213 return (0); 214 } 215 216 /* 217 * Set the time-of-day clock based on the value of the `struct timeval' arg. 218 * Return 0 on success; an error number otherwise. 219 */ 220 int 221 rtc_settime(handle, tv) 222 todr_chip_handle_t handle; 223 struct timeval *tv; 224 { 225 struct rtc_ebus_softc *sc = handle->cookie; 226 struct clock_ymdhms dt; 227 u_int year; 228 u_int wday; 229 230 clock_secs_to_ymdhms(tv->tv_sec, &dt); 231 232 year = dt.dt_year - 1900; 233 if (year >= 100 && rtc_auto_century_adjust != 0) 234 year -= 100; 235 236 wday = dt.dt_wday; 237 if (wday == 0) 238 wday = 7; 239 240 /* stop updates */ 241 mc146818_write(sc, MC_REGB, 242 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 243 244 mc146818_write(sc, MC_SEC, dt.dt_sec); 245 mc146818_write(sc, MC_MIN, dt.dt_min); 246 mc146818_write(sc, MC_HOUR, dt.dt_hour); 247 mc146818_write(sc, MC_DOW, wday); 248 mc146818_write(sc, MC_DOM, dt.dt_day); 249 mc146818_write(sc, MC_MONTH, dt.dt_mon); 250 mc146818_write(sc, MC_YEAR, year); 251 252 /* reenable updates */ 253 mc146818_write(sc, MC_REGB, 254 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 255 return (0); 256 } 257 258 259 /* 260 * RTC does not support TOD clock calibration 261 */ 262 263 /* ARGSUSED */ 264 int 265 rtc_getcal(handle, vp) 266 todr_chip_handle_t handle; 267 int *vp; 268 { 269 return (EOPNOTSUPP); 270 } 271 272 /* ARGSUSED */ 273 int 274 rtc_setcal(handle, v) 275 todr_chip_handle_t handle; 276 int v; 277 { 278 return (EOPNOTSUPP); 279 } 280
Indexes created Mon Sep 22 05:09:51 GMT 2025