rtc.c revision 1.12.4.1
1 /* $NetBSD: rtc.c,v 1.12.4.1 2006/09/09 02:43:09 rpaulo 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 1.12.4.1 2006/09/09 02:43:09 rpaulo 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 77 int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */ 78 79 80 /* 81 * MD read/write functions declared in mc146818reg.h 82 */ 83 #define RTC_ADDR 0 84 #define RTC_DATA 1 85 86 u_int 87 mc146818_read(void *cookie, u_int reg) 88 { 89 struct rtc_ebus_softc *sc = cookie; 90 91 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 92 return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); 93 } 94 95 void 96 mc146818_write(void *cookie, u_int reg, u_int datum) 97 { 98 struct rtc_ebus_softc *sc = cookie; 99 100 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); 101 bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); 102 } 103 104 105 static int 106 rtcmatch_ebus(struct device *parent, struct cfdata *cf, void *aux) 107 { 108 struct ebus_attach_args *ea = aux; 109 110 return (strcmp(cf->cf_name, ea->ea_name) == 0); 111 } 112 113 static void 114 rtcattach_ebus(struct device *parent, struct device *self, void *aux) 115 { 116 struct rtc_ebus_softc *sc = (void *)self; 117 struct ebus_attach_args *ea = aux; 118 119 todr_chip_handle_t handle; 120 121 sc->sc_bt = ea->ea_bustag; 122 if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 123 ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) 124 { 125 printf(": unable to map registers\n"); 126 return; 127 } 128 129 /* XXX: no "model" property in Krups */ 130 printf(": time-of-day clock\n"); 131 132 /* 133 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 134 * (although they shouldn't be wired to an interrupt 135 * controller on sparcs). 136 */ 137 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 138 139 /* setup our todr_handle */ 140 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 141 M_DEVBUF, M_NOWAIT); 142 143 handle->cookie = sc; 144 handle->bus_cookie = NULL; /* unused */ 145 handle->todr_gettime = rtc_gettime; 146 handle->todr_settime = rtc_settime; 147 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 148 149 todr_attach(handle); 150 } 151 152 153 /* 154 * Get time-of-day and convert to a `struct timeval' 155 * Return 0 on success; an error number otherwise. 156 */ 157 static int 158 rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv) 159 { 160 struct rtc_ebus_softc *sc = handle->cookie; 161 struct clock_ymdhms dt; 162 u_int year; 163 164 /* update in progress; spin loop */ 165 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 166 continue; 167 168 /* stop updates (XXX: do we need that???) */ 169 mc146818_write(sc, MC_REGB, 170 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 171 172 /* read time */ 173 dt.dt_sec = mc146818_read(sc, MC_SEC); 174 dt.dt_min = mc146818_read(sc, MC_MIN); 175 dt.dt_hour = mc146818_read(sc, MC_HOUR); 176 dt.dt_day = mc146818_read(sc, MC_DOM); 177 dt.dt_mon = mc146818_read(sc, MC_MONTH); 178 year = mc146818_read(sc, MC_YEAR); 179 180 /* reenable updates */ 181 mc146818_write(sc, MC_REGB, 182 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 183 184 /* year in the century 0..99: adjust to AD */ 185 year += 1900; 186 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 187 year += 100; 188 dt.dt_year = year; 189 190 /* simple sanity checks */ 191 if (dt.dt_mon > 12 || dt.dt_day > 31 192 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 193 return (ERANGE); 194 195 tv->tv_sec = clock_ymdhms_to_secs(&dt); 196 tv->tv_usec = 0; 197 return (0); 198 } 199 200 /* 201 * Set the time-of-day clock based on the value of the `struct timeval' arg. 202 * Return 0 on success; an error number otherwise. 203 */ 204 static int 205 rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv) 206 { 207 struct rtc_ebus_softc *sc = handle->cookie; 208 struct clock_ymdhms dt; 209 u_int year; 210 211 clock_secs_to_ymdhms(tv->tv_sec, &dt); 212 213 year = dt.dt_year - 1900; 214 if (year >= 100 && rtc_auto_century_adjust != 0) 215 year -= 100; 216 217 /* stop updates */ 218 mc146818_write(sc, MC_REGB, 219 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 220 221 mc146818_write(sc, MC_SEC, dt.dt_sec); 222 mc146818_write(sc, MC_MIN, dt.dt_min); 223 mc146818_write(sc, MC_HOUR, dt.dt_hour); 224 mc146818_write(sc, MC_DOW, dt.dt_wday + 1); 225 mc146818_write(sc, MC_DOM, dt.dt_day); 226 mc146818_write(sc, MC_MONTH, dt.dt_mon); 227 mc146818_write(sc, MC_YEAR, year); 228 229 /* reenable updates */ 230 mc146818_write(sc, MC_REGB, 231 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 232 return (0); 233 } 234
Indexes created Tue Sep 30 20:09:53 GMT 2025