rtc.c revision 1.9
1 /* $NetBSD: rtc.c,v 1.9 2002/12/03 17:54:54 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 CFATTACH_DECL(rtc_ebus, sizeof(struct rtc_ebus_softc), 65 rtcmatch_ebus, rtcattach_ebus, NULL, NULL); 66 67 /* XXX: global TOD clock handle (sparc/clock.c) */ 68 extern todr_chip_handle_t todr_handle; 69 70 /* todr(9) methods */ 71 int rtc_gettime(todr_chip_handle_t, struct timeval *); 72 int rtc_settime(todr_chip_handle_t, struct timeval *); 73 int rtc_getcal(todr_chip_handle_t, int *); 74 int rtc_setcal(todr_chip_handle_t, int); 75 76 int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */ 77 78 79 /* 80 * MD read/write functions declared in mc146818reg.h 81 */ 82 #define RTC_ADDR 0 83 #define RTC_DATA 1 84 85 u_int 86 mc146818_read(cookie, reg) 87 void *cookie; 88 u_int reg; 89 { 90 struct rtc_ebus_softc *sc = cookie; 91 92 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 93 return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); 94 } 95 96 void 97 mc146818_write(cookie, reg, datum) 98 void *cookie; 99 u_int reg; 100 u_int datum; 101 { 102 struct rtc_ebus_softc *sc = cookie; 103 104 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 105 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); 106 } 107 108 109 static int 110 rtcmatch_ebus(parent, cf, aux) 111 struct device *parent; 112 struct cfdata *cf; 113 void *aux; 114 { 115 struct ebus_attach_args *ea = aux; 116 117 return (strcmp(cf->cf_name, ea->ea_name) == 0); 118 } 119 120 static void 121 rtcattach_ebus(parent, self, aux) 122 struct device *parent; 123 struct device *self; 124 void *aux; 125 { 126 struct rtc_ebus_softc *sc = (void *)self; 127 struct ebus_attach_args *ea = aux; 128 129 todr_chip_handle_t handle; 130 131 sc->sc_bt = ea->ea_bustag; 132 if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 133 ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) 134 { 135 printf(": unable to map registers\n"); 136 return; 137 } 138 139 /* XXX: no "model" property in Krups */ 140 printf(": time-of-day clock\n"); 141 142 /* 143 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 144 * (although they shouldn't be wired to an interrupt 145 * controller on sparcs). 146 */ 147 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 148 149 /* setup our todr_handle */ 150 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 151 M_DEVBUF, M_NOWAIT); 152 153 handle->cookie = sc; 154 handle->bus_cookie = NULL; /* unused */ 155 handle->todr_gettime = rtc_gettime; 156 handle->todr_settime = rtc_settime; 157 handle->todr_getcal = rtc_getcal; 158 handle->todr_setcal = rtc_setcal; 159 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 160 161 todr_handle = handle; 162 } 163 164 165 /* 166 * Get time-of-day and convert to a `struct timeval' 167 * Return 0 on success; an error number otherwise. 168 */ 169 int 170 rtc_gettime(handle, tv) 171 todr_chip_handle_t handle; 172 struct timeval *tv; 173 { 174 struct rtc_ebus_softc *sc = handle->cookie; 175 struct clock_ymdhms dt; 176 u_int year; 177 178 /* update in progress; spin loop */ 179 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 180 continue; 181 182 /* stop updates (XXX: do we need that???) */ 183 mc146818_write(sc, MC_REGB, 184 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 185 186 /* read time */ 187 dt.dt_sec = mc146818_read(sc, MC_SEC); 188 dt.dt_min = mc146818_read(sc, MC_MIN); 189 dt.dt_hour = mc146818_read(sc, MC_HOUR); 190 dt.dt_day = mc146818_read(sc, MC_DOM); 191 dt.dt_mon = mc146818_read(sc, MC_MONTH); 192 year = mc146818_read(sc, MC_YEAR); 193 194 /* reenable updates */ 195 mc146818_write(sc, MC_REGB, 196 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 197 198 /* year in the century 0..99: adjust to AD */ 199 year += 1900; 200 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 201 year += 100; 202 dt.dt_year = year; 203 204 /* simple sanity checks */ 205 if (dt.dt_mon > 12 || dt.dt_day > 31 206 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 207 return (ERANGE); 208 209 tv->tv_sec = clock_ymdhms_to_secs(&dt); 210 tv->tv_usec = 0; 211 return (0); 212 } 213 214 /* 215 * Set the time-of-day clock based on the value of the `struct timeval' arg. 216 * Return 0 on success; an error number otherwise. 217 */ 218 int 219 rtc_settime(handle, tv) 220 todr_chip_handle_t handle; 221 struct timeval *tv; 222 { 223 struct rtc_ebus_softc *sc = handle->cookie; 224 struct clock_ymdhms dt; 225 u_int year; 226 227 clock_secs_to_ymdhms(tv->tv_sec, &dt); 228 229 year = dt.dt_year - 1900; 230 if (year >= 100 && rtc_auto_century_adjust != 0) 231 year -= 100; 232 233 /* stop updates */ 234 mc146818_write(sc, MC_REGB, 235 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 236 237 mc146818_write(sc, MC_SEC, dt.dt_sec); 238 mc146818_write(sc, MC_MIN, dt.dt_min); 239 mc146818_write(sc, MC_HOUR, dt.dt_hour); 240 mc146818_write(sc, MC_DOW, dt.dt_wday + 1); 241 mc146818_write(sc, MC_DOM, dt.dt_day); 242 mc146818_write(sc, MC_MONTH, dt.dt_mon); 243 mc146818_write(sc, MC_YEAR, year); 244 245 /* reenable updates */ 246 mc146818_write(sc, MC_REGB, 247 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 248 return (0); 249 } 250 251 252 /* 253 * RTC does not support TOD clock calibration 254 */ 255 256 /* ARGSUSED */ 257 int 258 rtc_getcal(handle, vp) 259 todr_chip_handle_t handle; 260 int *vp; 261 { 262 return (EOPNOTSUPP); 263 } 264 265 /* ARGSUSED */ 266 int 267 rtc_setcal(handle, v) 268 todr_chip_handle_t handle; 269 int v; 270 { 271 return (EOPNOTSUPP); 272 } 273
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