rtc.c revision 1.12
1 /* $NetBSD: rtc.c,v 1.12 2005/11/16 01:47:58 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/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.12 2005/11/16 01:47:58 uwe 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 static int rtc_gettime(todr_chip_handle_t, volatile struct timeval *); 75 static int rtc_settime(todr_chip_handle_t, volatile struct timeval *); 76 static int rtc_getcal(todr_chip_handle_t, int *); 77 static 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(void *cookie, u_int reg) 90 { 91 struct rtc_ebus_softc *sc = cookie; 92 93 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 94 return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); 95 } 96 97 void 98 mc146818_write(void *cookie, u_int reg, u_int datum) 99 { 100 struct rtc_ebus_softc *sc = cookie; 101 102 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 103 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); 104 } 105 106 107 static int 108 rtcmatch_ebus(struct device *parent, struct cfdata *cf, void *aux) 109 { 110 struct ebus_attach_args *ea = aux; 111 112 return (strcmp(cf->cf_name, ea->ea_name) == 0); 113 } 114 115 static void 116 rtcattach_ebus(struct device *parent, struct device *self, void *aux) 117 { 118 struct rtc_ebus_softc *sc = (void *)self; 119 struct ebus_attach_args *ea = aux; 120 121 todr_chip_handle_t handle; 122 123 sc->sc_bt = ea->ea_bustag; 124 if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 125 ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) 126 { 127 printf(": unable to map registers\n"); 128 return; 129 } 130 131 /* XXX: no "model" property in Krups */ 132 printf(": time-of-day clock\n"); 133 134 /* 135 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 136 * (although they shouldn't be wired to an interrupt 137 * controller on sparcs). 138 */ 139 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 140 141 /* setup our todr_handle */ 142 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 143 M_DEVBUF, M_NOWAIT); 144 145 handle->cookie = sc; 146 handle->bus_cookie = NULL; /* unused */ 147 handle->todr_gettime = rtc_gettime; 148 handle->todr_settime = rtc_settime; 149 handle->todr_getcal = rtc_getcal; 150 handle->todr_setcal = rtc_setcal; 151 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 152 153 todr_handle = handle; 154 } 155 156 157 /* 158 * Get time-of-day and convert to a `struct timeval' 159 * Return 0 on success; an error number otherwise. 160 */ 161 static int 162 rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv) 163 { 164 struct rtc_ebus_softc *sc = handle->cookie; 165 struct clock_ymdhms dt; 166 u_int year; 167 168 /* update in progress; spin loop */ 169 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 170 continue; 171 172 /* stop updates (XXX: do we need that???) */ 173 mc146818_write(sc, MC_REGB, 174 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 175 176 /* read time */ 177 dt.dt_sec = mc146818_read(sc, MC_SEC); 178 dt.dt_min = mc146818_read(sc, MC_MIN); 179 dt.dt_hour = mc146818_read(sc, MC_HOUR); 180 dt.dt_day = mc146818_read(sc, MC_DOM); 181 dt.dt_mon = mc146818_read(sc, MC_MONTH); 182 year = mc146818_read(sc, MC_YEAR); 183 184 /* reenable updates */ 185 mc146818_write(sc, MC_REGB, 186 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 187 188 /* year in the century 0..99: adjust to AD */ 189 year += 1900; 190 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 191 year += 100; 192 dt.dt_year = year; 193 194 /* simple sanity checks */ 195 if (dt.dt_mon > 12 || dt.dt_day > 31 196 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 197 return (ERANGE); 198 199 tv->tv_sec = clock_ymdhms_to_secs(&dt); 200 tv->tv_usec = 0; 201 return (0); 202 } 203 204 /* 205 * Set the time-of-day clock based on the value of the `struct timeval' arg. 206 * Return 0 on success; an error number otherwise. 207 */ 208 static int 209 rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv) 210 { 211 struct rtc_ebus_softc *sc = handle->cookie; 212 struct clock_ymdhms dt; 213 u_int year; 214 215 clock_secs_to_ymdhms(tv->tv_sec, &dt); 216 217 year = dt.dt_year - 1900; 218 if (year >= 100 && rtc_auto_century_adjust != 0) 219 year -= 100; 220 221 /* stop updates */ 222 mc146818_write(sc, MC_REGB, 223 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 224 225 mc146818_write(sc, MC_SEC, dt.dt_sec); 226 mc146818_write(sc, MC_MIN, dt.dt_min); 227 mc146818_write(sc, MC_HOUR, dt.dt_hour); 228 mc146818_write(sc, MC_DOW, dt.dt_wday + 1); 229 mc146818_write(sc, MC_DOM, dt.dt_day); 230 mc146818_write(sc, MC_MONTH, dt.dt_mon); 231 mc146818_write(sc, MC_YEAR, year); 232 233 /* reenable updates */ 234 mc146818_write(sc, MC_REGB, 235 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 236 return (0); 237 } 238 239 240 /* 241 * RTC does not support TOD clock calibration 242 */ 243 244 /* ARGSUSED */ 245 static int 246 rtc_getcal(todr_chip_handle_t handle, int *vp) 247 { 248 249 return (EOPNOTSUPP); 250 } 251 252 /* ARGSUSED */ 253 static int 254 rtc_setcal(todr_chip_handle_t handle, int v) 255 { 256 257 return (EOPNOTSUPP); 258 } 259
Indexes created Mon Sep 22 10:09:38 GMT 2025