rtc.c revision 1.15
1 /* $NetBSD: rtc.c,v 1.15 2009/09/20 16:18:21 tsutsui 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 1.15 2009/09/20 16:18:21 tsutsui 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(device_t, cfdata_t, void *); 65 static void rtcattach_ebus(device_t, device_t, 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(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux) 115 { 116 struct rtc_ebus_softc *sc = device_private(self); 117 struct ebus_attach_args *ea = aux; 118 todr_chip_handle_t handle; 119 120 sc->sc_bt = ea->ea_bustag; 121 if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 122 ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) 123 { 124 printf(": unable to map registers\n"); 125 return; 126 } 127 128 /* XXX: no "model" property in Krups */ 129 printf(": time-of-day clock\n"); 130 131 /* 132 * Turn interrupts off (clear MC_REGB_?IE bits), just in case 133 * (although they shouldn't be wired to an interrupt 134 * controller on sparcs). 135 */ 136 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 137 138 /* setup our todr_handle */ 139 handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), 140 M_DEVBUF, M_NOWAIT); 141 142 handle->cookie = sc; 143 handle->bus_cookie = NULL; /* unused */ 144 handle->todr_gettime = rtc_gettime; 145 handle->todr_settime = rtc_settime; 146 handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ 147 148 todr_attach(handle); 149 } 150 151 152 /* 153 * Get time-of-day and convert to a `struct timeval' 154 * Return 0 on success; an error number otherwise. 155 */ 156 static int 157 rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv) 158 { 159 struct rtc_ebus_softc *sc = handle->cookie; 160 struct clock_ymdhms dt; 161 u_int year; 162 163 /* update in progress; spin loop */ 164 while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) 165 continue; 166 167 /* stop updates (XXX: do we need that???) */ 168 mc146818_write(sc, MC_REGB, 169 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 170 171 /* read time */ 172 dt.dt_sec = mc146818_read(sc, MC_SEC); 173 dt.dt_min = mc146818_read(sc, MC_MIN); 174 dt.dt_hour = mc146818_read(sc, MC_HOUR); 175 dt.dt_day = mc146818_read(sc, MC_DOM); 176 dt.dt_mon = mc146818_read(sc, MC_MONTH); 177 year = mc146818_read(sc, MC_YEAR); 178 179 /* reenable updates */ 180 mc146818_write(sc, MC_REGB, 181 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 182 183 /* year in the century 0..99: adjust to AD */ 184 year += 1900; 185 if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) 186 year += 100; 187 dt.dt_year = year; 188 189 /* simple sanity checks */ 190 if (dt.dt_mon > 12 || dt.dt_day > 31 191 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 192 return (ERANGE); 193 194 tv->tv_sec = clock_ymdhms_to_secs(&dt); 195 tv->tv_usec = 0; 196 return (0); 197 } 198 199 /* 200 * Set the time-of-day clock based on the value of the `struct timeval' arg. 201 * Return 0 on success; an error number otherwise. 202 */ 203 static int 204 rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv) 205 { 206 struct rtc_ebus_softc *sc = handle->cookie; 207 struct clock_ymdhms dt; 208 u_int year; 209 210 clock_secs_to_ymdhms(tv->tv_sec, &dt); 211 212 year = dt.dt_year - 1900; 213 if (year >= 100 && rtc_auto_century_adjust != 0) 214 year -= 100; 215 216 /* stop updates */ 217 mc146818_write(sc, MC_REGB, 218 (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); 219 220 mc146818_write(sc, MC_SEC, dt.dt_sec); 221 mc146818_write(sc, MC_MIN, dt.dt_min); 222 mc146818_write(sc, MC_HOUR, dt.dt_hour); 223 mc146818_write(sc, MC_DOW, dt.dt_wday + 1); 224 mc146818_write(sc, MC_DOM, dt.dt_day); 225 mc146818_write(sc, MC_MONTH, dt.dt_mon); 226 mc146818_write(sc, MC_YEAR, year); 227 228 /* reenable updates */ 229 mc146818_write(sc, MC_REGB, 230 (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); 231 return (0); 232 } 233
Indexes created Sun Sep 21 20:09:37 GMT 2025