rs5c313.c revision 1.7.4.1
1 /* $NetBSD: rs5c313.c,v 1.7.4.1 2008/05/16 02:24:06 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 The NetBSD Foundation, Inc. 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: rs5c313.c,v 1.7.4.1 2008/05/16 02:24:06 yamt Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kernel.h> 36 37 #include <dev/clock_subr.h> 38 39 #include <dev/ic/rs5c313reg.h> 40 #include <dev/ic/rs5c313var.h> 41 42 43 /* todr(9) methods */ 44 static int rs5c313_todr_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 45 static int rs5c313_todr_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 46 47 /* sugar for chip access */ 48 #define rtc_begin(sc) ((*sc->sc_ops->rs5c313_op_begin)(sc)) 49 #define rtc_ce(sc, onoff) ((*sc->sc_ops->rs5c313_op_ce)(sc, onoff)) 50 #define rtc_clk(sc, onoff) ((*sc->sc_ops->rs5c313_op_clk)(sc, onoff)) 51 #define rtc_dir(sc, output) ((*sc->sc_ops->rs5c313_op_dir)(sc, output)) 52 #define rtc_di(sc) ((*sc->sc_ops->rs5c313_op_read)(sc)) 53 #define rtc_do(sc, bit) ((*sc->sc_ops->rs5c313_op_write)(sc, bit)) 54 55 static int rs5c313_init(struct rs5c313_softc *); 56 static int rs5c313_read_reg(struct rs5c313_softc *, int); 57 static void rs5c313_write_reg(struct rs5c313_softc *, int, int); 58 59 60 void 61 rs5c313_attach(struct rs5c313_softc *sc) 62 { 63 device_t self = sc->sc_dev; 64 65 aprint_naive("\n"); 66 aprint_normal(": real time clock\n"); 67 68 sc->sc_todr.cookie = sc; 69 sc->sc_todr.todr_gettime_ymdhms = rs5c313_todr_gettime_ymdhms; 70 sc->sc_todr.todr_settime_ymdhms = rs5c313_todr_settime_ymdhms; 71 72 if (rs5c313_init(sc) != 0) { 73 aprint_error_dev(self, "init failed\n"); 74 return; 75 } 76 77 todr_attach(&sc->sc_todr); 78 } 79 80 81 static int 82 rs5c313_init(struct rs5c313_softc *sc) 83 { 84 device_t self = sc->sc_dev; 85 int status = 0; 86 int retry; 87 88 rtc_ce(sc, 0); 89 90 rtc_begin(sc); 91 rtc_ce(sc, 1); 92 93 if ((rs5c313_read_reg(sc, RS5C313_CTRL) & CTRL_XSTP) == 0) { 94 sc->sc_valid = 1; 95 goto done; 96 } 97 98 sc->sc_valid = 0; 99 aprint_error_dev(self, "time not valid\n"); 100 101 rs5c313_write_reg(sc, RS5C313_TINT, 0); 102 rs5c313_write_reg(sc, RS5C313_CTRL, (CTRL_BASE | CTRL_ADJ)); 103 104 for (retry = 1000; retry > 0; --retry) { 105 if (rs5c313_read_reg(sc, RS5C313_CTRL) & CTRL_BSY) 106 delay(1); 107 else 108 break; 109 } 110 111 if (retry == 0) { 112 status = EIO; 113 goto done; 114 } 115 116 rs5c313_write_reg(sc, RS5C313_CTRL, CTRL_BASE); 117 118 done: 119 rtc_ce(sc, 0); 120 return status; 121 } 122 123 124 static int 125 rs5c313_todr_gettime_ymdhms(todr_chip_handle_t todr, struct clock_ymdhms *dt) 126 { 127 struct rs5c313_softc *sc = todr->cookie; 128 int retry; 129 int s; 130 131 /* 132 * If chip had invalid data on init, don't bother reading 133 * bogus values, let todr(9) cope. 134 */ 135 if (sc->sc_valid == 0) 136 return EIO; 137 138 s = splhigh(); 139 140 rtc_begin(sc); 141 for (retry = 10; retry > 0; --retry) { 142 rtc_ce(sc, 1); 143 144 rs5c313_write_reg(sc, RS5C313_CTRL, CTRL_BASE); 145 if ((rs5c313_read_reg(sc, RS5C313_CTRL) & CTRL_BSY) == 0) 146 break; 147 148 rtc_ce(sc, 0); 149 delay(1); 150 } 151 152 if (retry == 0) { 153 splx(s); 154 return EIO; 155 } 156 157 #define RTCGET(x, y) \ 158 do { \ 159 int ones = rs5c313_read_reg(sc, RS5C313_ ## y ## 1); \ 160 int tens = rs5c313_read_reg(sc, RS5C313_ ## y ## 10); \ 161 dt->dt_ ## x = tens * 10 + ones; \ 162 } while (/* CONSTCOND */0) 163 164 RTCGET(sec, SEC); 165 RTCGET(min, MIN); 166 RTCGET(hour, HOUR); 167 RTCGET(day, DAY); 168 RTCGET(mon, MON); 169 RTCGET(year, YEAR); 170 #undef RTCGET 171 dt->dt_wday = rs5c313_read_reg(sc, RS5C313_WDAY); 172 173 rtc_ce(sc, 0); 174 splx(s); 175 176 177 dt->dt_year = (dt->dt_year % 100) + 1900; 178 if (dt->dt_year < POSIX_BASE_YEAR) { 179 dt->dt_year += 100; 180 } 181 182 return 0; 183 } 184 185 186 static int 187 rs5c313_todr_settime_ymdhms(todr_chip_handle_t todr, struct clock_ymdhms *dt) 188 { 189 struct rs5c313_softc *sc = todr->cookie; 190 int retry; 191 int t; 192 int s; 193 194 s = splhigh(); 195 196 rtc_begin(sc); 197 for (retry = 10; retry > 0; --retry) { 198 rtc_ce(sc, 1); 199 200 rs5c313_write_reg(sc, RS5C313_CTRL, CTRL_BASE); 201 if ((rs5c313_read_reg(sc, RS5C313_CTRL) & CTRL_BSY) == 0) 202 break; 203 204 rtc_ce(sc, 0); 205 delay(1); 206 } 207 208 if (retry == 0) { 209 splx(s); 210 return EIO; 211 } 212 213 #define RTCSET(x, y) \ 214 do { \ 215 t = TOBCD(dt->dt_ ## y) & 0xff; \ 216 rs5c313_write_reg(sc, RS5C313_ ## x ## 1, t & 0x0f); \ 217 rs5c313_write_reg(sc, RS5C313_ ## x ## 10, (t >> 4) & 0x0f); \ 218 } while (/* CONSTCOND */0) 219 220 RTCSET(SEC, sec); 221 RTCSET(MIN, min); 222 RTCSET(HOUR, hour); 223 RTCSET(DAY, day); 224 RTCSET(MON, mon); 225 226 #undef RTCSET 227 228 t = dt->dt_year % 100; 229 t = TOBCD(t); 230 rs5c313_write_reg(sc, RS5C313_YEAR1, t & 0x0f); 231 rs5c313_write_reg(sc, RS5C313_YEAR10, (t >> 4) & 0x0f); 232 233 rs5c313_write_reg(sc, RS5C313_WDAY, dt->dt_wday); 234 235 rtc_ce(sc, 0); 236 splx(s); 237 238 sc->sc_valid = 1; 239 return 0; 240 } 241 242 243 static int 244 rs5c313_read_reg(struct rs5c313_softc *sc, int addr) 245 { 246 int data; 247 248 /* output */ 249 rtc_dir(sc, 1); 250 251 /* control */ 252 rtc_do(sc, 1); /* ignored */ 253 rtc_do(sc, 1); /* R/#W = 1(READ) */ 254 rtc_do(sc, 1); /* AD = 1 */ 255 rtc_do(sc, 0); /* DT = 0 */ 256 257 /* address */ 258 rtc_do(sc, addr & 0x8); /* A3 */ 259 rtc_do(sc, addr & 0x4); /* A2 */ 260 rtc_do(sc, addr & 0x2); /* A1 */ 261 rtc_do(sc, addr & 0x1); /* A0 */ 262 263 /* input */ 264 rtc_dir(sc, 0); 265 266 /* ignore */ 267 (void)rtc_di(sc); 268 (void)rtc_di(sc); 269 (void)rtc_di(sc); 270 (void)rtc_di(sc); 271 272 /* data */ 273 data = rtc_di(sc); /* D3 */ 274 data <<= 1; 275 data |= rtc_di(sc); /* D2 */ 276 data <<= 1; 277 data |= rtc_di(sc); /* D1 */ 278 data <<= 1; 279 data |= rtc_di(sc); /* D0 */ 280 281 return data; 282 } 283 284 285 static void 286 rs5c313_write_reg(struct rs5c313_softc *sc, int addr, int data) 287 { 288 289 /* output */ 290 rtc_dir(sc, 1); 291 292 /* control */ 293 rtc_do(sc, 1); /* ignored */ 294 rtc_do(sc, 0); /* R/#W = 0 (WRITE) */ 295 rtc_do(sc, 1); /* AD = 1 */ 296 rtc_do(sc, 0); /* DT = 0 */ 297 298 /* address */ 299 rtc_do(sc, addr & 0x8); /* A3 */ 300 rtc_do(sc, addr & 0x4); /* A2 */ 301 rtc_do(sc, addr & 0x2); /* A1 */ 302 rtc_do(sc, addr & 0x1); /* A0 */ 303 304 /* control */ 305 rtc_do(sc, 1); /* ignored */ 306 rtc_do(sc, 0); /* R/#W = 0(WRITE) */ 307 rtc_do(sc, 0); /* AD = 0 */ 308 rtc_do(sc, 1); /* DT = 1 */ 309 310 /* data */ 311 rtc_do(sc, data & 0x8); /* D3 */ 312 rtc_do(sc, data & 0x4); /* D2 */ 313 rtc_do(sc, data & 0x2); /* D1 */ 314 rtc_do(sc, data & 0x1); /* D0 */ 315 } 316
Indexes created Tue Oct 21 15:09:54 GMT 2025