rtc.c revision 1.10
1 /* $NetBSD: rtc.c,v 1.10 2003/07/15 00:04:56 lukem 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/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.10 2003/07/15 00:04:56 lukem Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/device.h> 42 #include <sys/malloc.h> 43 #include <sys/systm.h> 44 #ifdef GPROF 45 #include <sys/gmon.h> 46 #endif 47 48 #include <machine/bus.h> 49 #include <machine/autoconf.h> 50 51 #include <dev/clock_subr.h> 52 #include <dev/ic/mc146818reg.h> 53 54 #include <dev/ebus/ebusreg.h> 55 #include <dev/ebus/ebusvar.h> 56 57 struct rtc_ebus_softc { 58 struct device sc_dev; 59 60 bus_space_tag_t sc_bt; /* parent bus tag */ 61 bus_space_handle_t sc_bh; /* handle for registers */ 62 }; 63 64 static int rtcmatch_ebus(struct device *, struct cfdata *, void *); 65 static void rtcattach_ebus(struct device *, struct device *, void *); 66 67 CFATTACH_DECL(rtc_ebus, sizeof(struct rtc_ebus_softc), 68 rtcmatch_ebus, rtcattach_ebus, NULL, NULL); 69 70 /* XXX: global TOD clock handle (sparc/clock.c) */ 71 extern todr_chip_handle_t todr_handle; 72 73 /* todr(9) methods */ 74 int rtc_gettime(todr_chip_handle_t, struct timeval *); 75 int rtc_settime(todr_chip_handle_t, struct timeval *); 76 int rtc_getcal(todr_chip_handle_t, int *); 77 int rtc_setcal(todr_chip_handle_t, int); 78 79 int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */ 80 81 82 /* 83 * MD read/write functions declared in mc146818reg.h 84 */ 85 #define RTC_ADDR 0 86 #define RTC_DATA 1 87 88 u_int 89 mc146818_read(cookie, reg) 90 void *cookie; 91 u_int reg; 92 { 93 struct rtc_ebus_softc *sc = cookie; 94 95 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 96 return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); 97 } 98 99 void 100 mc146818_write(cookie, reg, datum) 101 void *cookie; 102 u_int reg; 103 u_int datum; 104 { 105 struct rtc_ebus_softc *sc = cookie; 106 107 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 108 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); 109 } 110 111 112 static int 113 rtcmatch_ebus(parent, cf, aux) 114 struct device *parent; 115 struct cfdata *cf; 116 void *aux; 117 { 118 struct ebus_attach_args *ea = aux; 119 120 return (strcmp(cf->cf_name, ea->ea_name) == 0); 121 } 122 123 static void 124 rtcattach_ebus(parent, self, aux) 125 struct device *parent; 126 struct device *self; 127 void *aux; 128 { 129 struct rtc_ebus_softc *sc = (void *)self; 130 struct ebus_attach_args *ea = aux; 131 132 todr_chip_handle_t handle; 133 134 sc->sc_bt = ea->ea_bustag; 135 if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 136 ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) 137 { 138 printf(": unable to map registers\n"); 139 return; 140 } 141 142 /* XXX: no "model" property in Krups */ 143 printf(": time-of-day clock\n"); 144 145 /* 146 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 147 * (although they shouldn't be wired to an interrupt 148 * controller on sparcs). 149 */ 150 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 151 152 /* setup our todr_handle */ 153 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 154 M_DEVBUF, M_NOWAIT); 155 156 handle->cookie = sc; 157 handle->bus_cookie = NULL; /* unused */ 158 handle->todr_gettime = rtc_gettime; 159 handle->todr_settime = rtc_settime; 160 handle->todr_getcal = rtc_getcal; 161 handle->todr_setcal = rtc_setcal; 162 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 163 164 todr_handle = handle; 165 } 166 167 168 /* 169 * Get time-of-day and convert to a `struct timeval' 170 * Return 0 on success; an error number otherwise. 171 */ 172 int 173 rtc_gettime(handle, tv) 174 todr_chip_handle_t handle; 175 struct timeval *tv; 176 { 177 struct rtc_ebus_softc *sc = handle->cookie; 178 struct clock_ymdhms dt; 179 u_int year; 180 181 /* update in progress; spin loop */ 182 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 183 continue; 184 185 /* stop updates (XXX: do we need that???) */ 186 mc146818_write(sc, MC_REGB, 187 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 188 189 /* read time */ 190 dt.dt_sec = mc146818_read(sc, MC_SEC); 191 dt.dt_min = mc146818_read(sc, MC_MIN); 192 dt.dt_hour = mc146818_read(sc, MC_HOUR); 193 dt.dt_day = mc146818_read(sc, MC_DOM); 194 dt.dt_mon = mc146818_read(sc, MC_MONTH); 195 year = mc146818_read(sc, MC_YEAR); 196 197 /* reenable updates */ 198 mc146818_write(sc, MC_REGB, 199 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 200 201 /* year in the century 0..99: adjust to AD */ 202 year += 1900; 203 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 204 year += 100; 205 dt.dt_year = year; 206 207 /* simple sanity checks */ 208 if (dt.dt_mon > 12 || dt.dt_day > 31 209 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 210 return (ERANGE); 211 212 tv->tv_sec = clock_ymdhms_to_secs(&dt); 213 tv->tv_usec = 0; 214 return (0); 215 } 216 217 /* 218 * Set the time-of-day clock based on the value of the `struct timeval' arg. 219 * Return 0 on success; an error number otherwise. 220 */ 221 int 222 rtc_settime(handle, tv) 223 todr_chip_handle_t handle; 224 struct timeval *tv; 225 { 226 struct rtc_ebus_softc *sc = handle->cookie; 227 struct clock_ymdhms dt; 228 u_int year; 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 /* stop updates */ 237 mc146818_write(sc, MC_REGB, 238 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 239 240 mc146818_write(sc, MC_SEC, dt.dt_sec); 241 mc146818_write(sc, MC_MIN, dt.dt_min); 242 mc146818_write(sc, MC_HOUR, dt.dt_hour); 243 mc146818_write(sc, MC_DOW, dt.dt_wday + 1); 244 mc146818_write(sc, MC_DOM, dt.dt_day); 245 mc146818_write(sc, MC_MONTH, dt.dt_mon); 246 mc146818_write(sc, MC_YEAR, year); 247 248 /* reenable updates */ 249 mc146818_write(sc, MC_REGB, 250 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 251 return (0); 252 } 253 254 255 /* 256 * RTC does not support TOD clock calibration 257 */ 258 259 /* ARGSUSED */ 260 int 261 rtc_getcal(handle, vp) 262 todr_chip_handle_t handle; 263 int *vp; 264 { 265 return (EOPNOTSUPP); 266 } 267 268 /* ARGSUSED */ 269 int 270 rtc_setcal(handle, v) 271 todr_chip_handle_t handle; 272 int v; 273 { 274 return (EOPNOTSUPP); 275 } 276
Indexes created Mon Sep 22 10:09:38 GMT 2025