1 /* $NetBSD: rtc.c,v 1.5 2001/05/13 16:55:40 chs Exp $ */ 2 /* 3 * Copyright (c) 1998 Darrin Jewell 4 * Copyright (c) 1997 Rolf Grossmann 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Rolf Grossmann. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* These haven't been tested to see how they interact with NeXTstep's 34 * interpretation of the rtc. 35 */ 36 37 /* Now using this in the kernel. This should be turned into a device 38 * Darrin B Jewell <jewell@mit.edu> Tue Jan 27 20:59:25 1998 39 */ 40 41 #include <sys/param.h> 42 #include <sys/cdefs.h> /* for __P */ 43 #include <sys/systm.h> /* for panic */ 44 45 #include <machine/cpu.h> 46 47 #include <dev/clock_subr.h> 48 49 #include <next68k/next68k/rtc.h> 50 51 #include <next68k/dev/clockreg.h> 52 53 /* #define RTC_DEBUG */ 54 55 u_char new_clock; 56 volatile u_int *scr2 = (u_int *)NEXT_P_SCR2; /* will get memory mapped in rtc_init */ 57 58 void 59 rtc_init(void) 60 { 61 u_char val; 62 63 scr2 = (u_int *)IIOV(NEXT_P_SCR2); 64 val = rtc_read(RTC_STATUS); 65 new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0; 66 67 printf("Looks like a %s clock chip.\n", 68 (new_clock? 69 "MCS1850 (new style)": 70 "MC68HC68T1 (old style)")); 71 72 #ifdef RTC_DEBUG 73 rtc_print(); 74 #endif 75 } 76 77 void 78 rtc_print(void) 79 { 80 81 #define RTC_PRINT(x) printf("\t%16s= 0x%02x\n",#x, rtc_read(x)) 82 83 if (new_clock) { 84 RTC_PRINT(RTC_RAM); 85 RTC_PRINT(RTC_CNTR0); 86 RTC_PRINT(RTC_CNTR1); 87 RTC_PRINT(RTC_CNTR2); 88 RTC_PRINT(RTC_CNTR3); 89 RTC_PRINT(RTC_ALARM0); 90 RTC_PRINT(RTC_ALARM1); 91 RTC_PRINT(RTC_ALARM2); 92 RTC_PRINT(RTC_ALARM3); 93 RTC_PRINT(RTC_STATUS); 94 RTC_PRINT(RTC_CONTROL); 95 } else { 96 RTC_PRINT(RTC_RAM); 97 RTC_PRINT(RTC_SEC); 98 RTC_PRINT(RTC_MIN); 99 RTC_PRINT(RTC_HRS); 100 RTC_PRINT(RTC_DAY); 101 RTC_PRINT(RTC_DATE); 102 RTC_PRINT(RTC_MON); 103 RTC_PRINT(RTC_YR); 104 RTC_PRINT(RTC_ALARM_SEC); 105 RTC_PRINT(RTC_ALARM_MIN); 106 RTC_PRINT(RTC_ALARM_HR); 107 RTC_PRINT(RTC_STATUS); 108 RTC_PRINT(RTC_CONTROL); 109 RTC_PRINT(RTC_INTRCTL); 110 } 111 } 112 113 114 u_char 115 rtc_read(u_char reg) 116 { 117 int i; 118 u_int tmp; 119 u_char val; 120 121 *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; 122 DELAY(1); 123 124 val = reg; 125 for (i=0; i<8; i++) { 126 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 127 if (val & 0x80) 128 tmp |= SCR2_RTDATA; 129 130 *scr2 = tmp; 131 DELAY(1); 132 *scr2 = tmp | SCR2_RTCLK; 133 DELAY(1); 134 *scr2 = tmp; 135 DELAY(1); 136 137 val <<= 1; 138 } 139 140 val = 0; /* should be anyway */ 141 for (i=0; i<8; i++) { 142 val <<= 1; 143 144 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 145 146 *scr2 = tmp | SCR2_RTCLK; 147 DELAY(1); 148 *scr2 = tmp; 149 DELAY(1); 150 151 if (*scr2 & SCR2_RTDATA) 152 val |= 1; 153 } 154 155 *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); 156 DELAY(1); 157 158 return val; 159 } 160 161 void 162 rtc_write(u_char reg, u_char v) 163 { 164 int i; 165 u_int tmp; 166 u_char val; 167 168 *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; 169 DELAY(1); 170 171 val = reg|RTC_WRITE; 172 173 for (i=0; i<8; i++) { 174 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 175 if (val & 0x80) 176 tmp |= SCR2_RTDATA; 177 178 *scr2 = tmp; 179 DELAY(1); 180 *scr2 = tmp | SCR2_RTCLK; 181 DELAY(1); 182 *scr2 = tmp; 183 DELAY(1); 184 185 val <<= 1; 186 } 187 188 DELAY(1); 189 190 for (i=0; i<8; i++) { 191 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 192 if (v & 0x80) 193 tmp |= SCR2_RTDATA; 194 195 *scr2 = tmp; 196 DELAY(1); 197 *scr2 = tmp | SCR2_RTCLK; 198 DELAY(1); 199 *scr2 = tmp; 200 DELAY(1); 201 202 v <<= 1; 203 } 204 205 *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); 206 DELAY(1); 207 } 208 209 void 210 poweroff(void) 211 { 212 int reg, t; 213 214 if(new_clock) { 215 reg = RTC_CNTR3; 216 } else { 217 reg = RTC_CNTR0; 218 } 219 220 t = rtc_read(reg); /* seconds */ 221 /* wait for clock to tick */ 222 while(t == rtc_read(reg)); 223 224 DELAY(850000); /* hardware bug workaround ? */ 225 226 if(new_clock) { 227 reg = RTC_CONTROL; 228 } else { 229 reg = RTC_INTRCTL; 230 } 231 232 rtc_write(reg, rtc_read(reg)|(RTC_PDOWN)); 233 234 printf("....................."); /* @@@ work around some sort of bug. */ 235 236 panic("Failed to poweroff!\n"); 237 } 238 239 240 time_t 241 getsecs(void) 242 { 243 u_int secs = 0; 244 245 if (new_clock) { 246 secs = rtc_read(RTC_CNTR3) << 24 | 247 rtc_read(RTC_CNTR2) << 16 | 248 rtc_read(RTC_CNTR1) << 8 | 249 rtc_read(RTC_CNTR0); 250 } else { 251 struct clock_ymdhms val; 252 { 253 u_char y; 254 y = FROMBCD(rtc_read(RTC_YR)); 255 if (y >= 69) { 256 val.dt_year = 1900+y; 257 } else { 258 val.dt_year = 2000+y; 259 } 260 } 261 val.dt_mon = FROMBCD(rtc_read(RTC_MON)&0x1f); 262 val.dt_day = FROMBCD(rtc_read(RTC_DATE)&0x3f); 263 val.dt_wday = FROMBCD(rtc_read(RTC_DAY)&0x7); 264 { 265 u_char h; 266 h = rtc_read(RTC_HRS); 267 if (h & 0x80) { /* time is am/pm format */ 268 val.dt_hour = FROMBCD(h&0x1f); 269 if (h & 0x20) { /* pm */ 270 if (val.dt_hour < 12) val.dt_hour += 12; 271 } else { /* am */ 272 if (val.dt_hour == 12) val.dt_hour = 0; 273 } 274 } else { /* time is 24 hour format */ 275 val.dt_hour = FROMBCD(h & 0x3f); 276 } 277 } 278 val.dt_min = FROMBCD(rtc_read(RTC_MIN)&0x7f); 279 val.dt_sec = FROMBCD(rtc_read(RTC_SEC)&0x7f); 280 281 secs = clock_ymdhms_to_secs(&val); 282 } 283 284 return secs; 285 } 286 287 void 288 setsecs(time_t secs) 289 { 290 291 /* Stop the clock */ 292 rtc_write(RTC_CONTROL,rtc_read(RTC_CONTROL) & ~RTC_START); 293 294 #ifdef RTC_DEBUG 295 printf("Setting RTC to 0x%08x. Regs before:\n",secs); 296 rtc_print(); 297 #endif 298 299 if (new_clock) { 300 rtc_write(RTC_CNTR3, (secs << 24) & 0xff); 301 rtc_write(RTC_CNTR2, (secs << 16) & 0xff); 302 rtc_write(RTC_CNTR1, (secs << 8) & 0xff); 303 rtc_write(RTC_CNTR0, (secs) & 0xff); 304 305 } else { 306 struct clock_ymdhms val; 307 clock_secs_to_ymdhms(secs,&val); 308 rtc_write(RTC_SEC,TOBCD(val.dt_sec)); 309 rtc_write(RTC_MIN,TOBCD(val.dt_min)); 310 { 311 u_char h; 312 h = rtc_read(RTC_HRS); 313 if (h & 0x80) { /* time is am/pm format */ 314 if (val.dt_hour == 0) { 315 rtc_write(RTC_HRS,TOBCD(12)|0x80); 316 } else if (val.dt_hour < 12) { /* am */ 317 rtc_write(RTC_HRS,TOBCD(val.dt_hour)|0x80); 318 } else if (val.dt_hour == 12) { 319 rtc_write(RTC_HRS,TOBCD(12)|0x80|0x20); 320 } else { /* pm */ 321 rtc_write(RTC_HRS,TOBCD(val.dt_hour-12)|0x80|0x20); 322 } 323 } else { /* time is 24 hour format */ 324 rtc_write(RTC_HRS,TOBCD(val.dt_hour)); 325 } 326 } 327 rtc_write(RTC_DAY,TOBCD(val.dt_wday)); 328 rtc_write(RTC_DATE,TOBCD(val.dt_day)); 329 rtc_write(RTC_MON,TOBCD(val.dt_mon)); 330 rtc_write(RTC_YR,TOBCD(val.dt_year%100)); 331 } 332 333 #ifdef RTC_DEBUG 334 printf("Regs after:\n",secs); 335 rtc_print(); 336 #endif 337 338 /* restart the clock */ 339 rtc_write(RTC_CONTROL,rtc_read(RTC_CONTROL) | RTC_START); 340 341 } 342