rtc.c revision 1.19
1 /* $NetBSD: rtc.c,v 1.19 2008/03/29 06:47:08 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 36 * 37 * @(#)clock.c 8.2 (Berkeley) 1/12/94 38 */ 39 /* 40 * Copyright (c) 1988 University of Utah. 41 * 42 * This code is derived from software contributed to Berkeley by 43 * the Systems Programming Group of the University of Utah Computer 44 * Science Department. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 75 * 76 * @(#)clock.c 8.2 (Berkeley) 1/12/94 77 */ 78 79 /* 80 * attachment for HP300 real-time clock (RTC) 81 */ 82 83 #include <sys/cdefs.h> 84 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.19 2008/03/29 06:47:08 tsutsui Exp $"); 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/device.h> 89 #include <sys/malloc.h> 90 91 #include <hp300/dev/intiovar.h> 92 #include <hp300/dev/rtcreg.h> 93 94 #include <dev/clock_subr.h> 95 96 struct rtc_softc { 97 device_t sc_dev; 98 bus_space_tag_t sc_bst; 99 bus_space_handle_t sc_bsh; 100 struct todr_chip_handle sc_handle; 101 }; 102 103 static int rtcmatch(device_t, cfdata_t, void *); 104 static void rtcattach(device_t, device_t, void *aux); 105 106 CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc), 107 rtcmatch, rtcattach, NULL, NULL); 108 109 static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 110 static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 111 static uint8_t rtc_readreg(struct rtc_softc *, int); 112 static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); 113 114 115 static int 116 rtcmatch(device_t parent, cfdata_t cf, void *aux) 117 { 118 struct intio_attach_args *ia = aux; 119 120 if (strcmp("rtc", ia->ia_modname) != 0) 121 return 0; 122 123 return 1; 124 } 125 126 static void 127 rtcattach(device_t parent, device_t self, void *aux) 128 { 129 struct rtc_softc *sc = device_private(self); 130 struct intio_attach_args *ia = aux; 131 struct todr_chip_handle *todr_handle; 132 bus_space_tag_t bst = ia->ia_bst; 133 134 sc->sc_dev = self; 135 if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 136 &sc->sc_bsh)) { 137 aprint_error(": can't map registers\n"); 138 return; 139 } 140 141 aprint_normal("\n"); 142 143 sc->sc_bst = bst; 144 145 todr_handle = &sc->sc_handle; 146 todr_handle->cookie = sc; 147 todr_handle->todr_gettime = NULL; 148 todr_handle->todr_settime = NULL; 149 todr_handle->todr_gettime_ymdhms = rtc_gettime_ymdhms; 150 todr_handle->todr_settime_ymdhms = rtc_settime_ymdhms; 151 todr_handle->todr_setwen = NULL; 152 153 todr_attach(todr_handle); 154 } 155 156 static int 157 rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 158 { 159 struct rtc_softc *sc; 160 int i, year; 161 bool read_okay; 162 uint8_t rtc_registers[NUM_RTC_REGS]; 163 164 sc = handle->cookie; 165 166 /* read rtc registers */ 167 read_okay = false; 168 while (!read_okay) { 169 read_okay = true; 170 for (i = 0; i < NUM_RTC_REGS; i++) 171 rtc_registers[i] = rtc_readreg(sc, i); 172 for (i = 0; i < NUM_RTC_REGS; i++) 173 if (rtc_registers[i] != rtc_readreg(sc, i)) 174 read_okay = false; 175 } 176 177 #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) 178 179 dt->dt_sec = rtc_to_decimal(1, 0); 180 dt->dt_min = rtc_to_decimal(3, 2); 181 dt->dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + 182 rtc_registers[4]; 183 dt->dt_day = rtc_to_decimal(8, 7); 184 dt->dt_mon = rtc_to_decimal(10, 9); 185 186 year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; 187 if (year < POSIX_BASE_YEAR) 188 year += 100; 189 dt->dt_year = year; 190 191 #undef rtc_to_decimal 192 193 return 0; 194 } 195 196 static int 197 rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 198 { 199 struct rtc_softc *sc; 200 int i, year; 201 uint8_t rtc_registers[NUM_RTC_REGS]; 202 203 sc = handle->cookie; 204 year = dt->dt_year - RTC_BASE_YEAR; 205 if (year > 99) 206 year -= 100; 207 208 #define decimal_to_rtc(a,b,n) \ 209 rtc_registers[a] = (n) % 10; \ 210 rtc_registers[b] = (n) / 10; 211 212 decimal_to_rtc(0, 1, dt->dt_sec); 213 decimal_to_rtc(2, 3, dt->dt_min); 214 decimal_to_rtc(7, 8, dt->dt_day); 215 decimal_to_rtc(9, 10, dt->dt_mon); 216 decimal_to_rtc(11, 12, year); 217 218 rtc_registers[4] = dt->dt_hour % 10; 219 rtc_registers[5] = ((dt->dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; 220 221 rtc_registers[6] = 0; 222 223 #undef decimal_to_rtc 224 225 /* write rtc registers */ 226 rtc_writereg(sc, 15, 13); /* reset prescalar */ 227 for (i = 0; i < NUM_RTC_REGS; i++) 228 if (rtc_registers[i] != 229 rtc_writereg(sc, i, rtc_registers[i])) 230 return 1; 231 return 0; 232 } 233 234 static uint8_t 235 rtc_readreg(struct rtc_softc *sc, int reg) 236 { 237 bus_space_tag_t bst = sc->sc_bst; 238 bus_space_handle_t bsh = sc->sc_bsh; 239 uint8_t data; 240 int s = splvm(); 241 242 data = reg; 243 intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); 244 intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); 245 246 splx(s); 247 return data; 248 } 249 250 static uint8_t 251 rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) 252 { 253 bus_space_tag_t bst = sc->sc_bst; 254 bus_space_handle_t bsh = sc->sc_bsh; 255 uint8_t tmp; 256 int s = splvm(); 257 258 tmp = (data << 4) | reg; 259 intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); 260 intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); 261 intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); 262 263 splx(s); 264 return tmp; 265 } 266
Indexes created Mon Sep 22 13:09:51 GMT 2025