wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * ds1302.c - Support for the Dallas Semiconductor DS1302 Timekeeping Chip |
| 3 | * |
| 4 | * Rex G. Feany <rfeany@zumanetworks.com> |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <command.h> |
| 10 | #include <rtc.h> |
| 11 | |
Michal Simek | 871c18d | 2008-07-14 19:45:37 +0200 | [diff] [blame] | 12 | #if defined(CONFIG_CMD_DATE) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 13 | |
| 14 | /* GPP Pins */ |
| 15 | #define DATA 0x200 |
| 16 | #define SCLK 0x400 |
| 17 | #define RST 0x800 |
| 18 | |
| 19 | /* Happy Fun Defines(tm) */ |
| 20 | #define RESET rtc_go_low(RST), rtc_go_low(SCLK) |
| 21 | #define N_RESET rtc_go_high(RST), rtc_go_low(SCLK) |
| 22 | |
| 23 | #define CLOCK_HIGH rtc_go_high(SCLK) |
| 24 | #define CLOCK_LOW rtc_go_low(SCLK) |
| 25 | |
| 26 | #define DATA_HIGH rtc_go_high(DATA) |
| 27 | #define DATA_LOW rtc_go_low(DATA) |
| 28 | #define DATA_READ (GTREGREAD(GPP_VALUE) & DATA) |
| 29 | |
| 30 | #undef RTC_DEBUG |
| 31 | |
| 32 | #ifdef RTC_DEBUG |
| 33 | # define DPRINTF(x,args...) printf("ds1302: " x , ##args) |
| 34 | static inline void DUMP(const char *ptr, int num) |
| 35 | { |
| 36 | while (num--) printf("%x ", *ptr++); |
| 37 | printf("]\n"); |
| 38 | } |
| 39 | #else |
| 40 | # define DPRINTF(x,args...) |
| 41 | # define DUMP(ptr, num) |
| 42 | #endif |
| 43 | |
| 44 | /* time data format for DS1302 */ |
| 45 | struct ds1302_st |
| 46 | { |
| 47 | unsigned char CH:1; /* clock halt 1=stop 0=start */ |
| 48 | unsigned char sec10:3; |
| 49 | unsigned char sec:4; |
| 50 | |
| 51 | unsigned char zero0:1; |
| 52 | unsigned char min10:3; |
| 53 | unsigned char min:4; |
| 54 | |
| 55 | unsigned char fmt:1; /* 1=12 hour 0=24 hour */ |
| 56 | unsigned char zero1:1; |
| 57 | unsigned char hr10:2; /* 10 (0-2) or am/pm (am/pm, 0-1) */ |
| 58 | unsigned char hr:4; |
| 59 | |
| 60 | unsigned char zero2:2; |
| 61 | unsigned char date10:2; |
| 62 | unsigned char date:4; |
| 63 | |
| 64 | unsigned char zero3:3; |
| 65 | unsigned char month10:1; |
| 66 | unsigned char month:4; |
| 67 | |
| 68 | unsigned char zero4:5; |
Wolfgang Denk | 53677ef | 2008-05-20 16:00:29 +0200 | [diff] [blame] | 69 | unsigned char day:3; /* day of week */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 70 | |
| 71 | unsigned char year10:4; |
| 72 | unsigned char year:4; |
| 73 | |
| 74 | unsigned char WP:1; /* write protect 1=protect 0=unprot */ |
| 75 | unsigned char zero5:7; |
| 76 | }; |
| 77 | |
| 78 | static int ds1302_initted=0; |
| 79 | |
| 80 | /* Pin control */ |
| 81 | static inline void |
| 82 | rtc_go_high(unsigned int mask) |
| 83 | { |
| 84 | unsigned int f = GTREGREAD(GPP_VALUE) | mask; |
| 85 | |
| 86 | GT_REG_WRITE(GPP_VALUE, f); |
| 87 | } |
| 88 | |
| 89 | static inline void |
| 90 | rtc_go_low(unsigned int mask) |
| 91 | { |
| 92 | unsigned int f = GTREGREAD(GPP_VALUE) & ~mask; |
| 93 | |
| 94 | GT_REG_WRITE(GPP_VALUE, f); |
| 95 | } |
| 96 | |
| 97 | static inline void |
| 98 | rtc_go_input(unsigned int mask) |
| 99 | { |
| 100 | unsigned int f = GTREGREAD(GPP_IO_CONTROL) & ~mask; |
| 101 | |
| 102 | GT_REG_WRITE(GPP_IO_CONTROL, f); |
| 103 | } |
| 104 | |
| 105 | static inline void |
| 106 | rtc_go_output(unsigned int mask) |
| 107 | { |
| 108 | unsigned int f = GTREGREAD(GPP_IO_CONTROL) | mask; |
| 109 | |
| 110 | GT_REG_WRITE(GPP_IO_CONTROL, f); |
| 111 | } |
| 112 | |
| 113 | /* Access data in RTC */ |
| 114 | |
| 115 | static void |
| 116 | write_byte(unsigned char b) |
| 117 | { |
| 118 | int i; |
| 119 | unsigned char mask=1; |
| 120 | |
| 121 | for(i=0;i<8;i++) { |
| 122 | CLOCK_LOW; /* Lower clock */ |
| 123 | (b&mask)?DATA_HIGH:DATA_LOW; /* set data */ |
| 124 | udelay(1); |
| 125 | CLOCK_HIGH; /* latch data with rising clock */ |
| 126 | udelay(1); |
| 127 | mask=mask<<1; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | static unsigned char |
| 132 | read_byte(void) |
| 133 | { |
| 134 | int i; |
| 135 | unsigned char mask=1; |
| 136 | unsigned char b=0; |
| 137 | |
| 138 | for(i=0;i<8;i++) { |
| 139 | CLOCK_LOW; |
| 140 | udelay(1); |
| 141 | if (DATA_READ) b|=mask; /* if this bit is high, set in b */ |
| 142 | CLOCK_HIGH; /* clock out next bit */ |
| 143 | udelay(1); |
| 144 | mask=mask<<1; |
| 145 | } |
| 146 | return b; |
| 147 | } |
| 148 | |
| 149 | static void |
| 150 | read_ser_drv(unsigned char addr, unsigned char *buf, int count) |
| 151 | { |
| 152 | int i; |
| 153 | #ifdef RTC_DEBUG |
| 154 | char *foo = buf; |
| 155 | #endif |
| 156 | |
| 157 | DPRINTF("READ 0x%x bytes @ 0x%x [ ", count, addr); |
| 158 | |
| 159 | addr|=1; /* READ */ |
| 160 | N_RESET; |
| 161 | udelay(4); |
| 162 | write_byte(addr); |
| 163 | rtc_go_input(DATA); /* Put gpp pin into input mode */ |
| 164 | udelay(1); |
| 165 | for(i=0;i<count;i++) *(buf++)=read_byte(); |
| 166 | RESET; |
| 167 | rtc_go_output(DATA);/* Reset gpp for output */ |
| 168 | udelay(4); |
| 169 | |
| 170 | DUMP(foo, count); |
| 171 | } |
| 172 | |
| 173 | static void |
| 174 | write_ser_drv(unsigned char addr, unsigned char *buf, int count) |
| 175 | { |
| 176 | int i; |
| 177 | |
| 178 | DPRINTF("WRITE 0x%x bytes @ 0x%x [ ", count, addr); |
| 179 | DUMP(buf, count); |
| 180 | |
| 181 | addr&=~1; /* WRITE */ |
| 182 | N_RESET; |
| 183 | udelay(4); |
| 184 | write_byte(addr); |
| 185 | for(i=0;i<count;i++) write_byte(*(buf++)); |
| 186 | RESET; |
| 187 | udelay(4); |
| 188 | |
| 189 | } |
| 190 | |
| 191 | void |
| 192 | rtc_init(void) |
| 193 | { |
Wolfgang Denk | 53677ef | 2008-05-20 16:00:29 +0200 | [diff] [blame] | 194 | struct ds1302_st bbclk; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 195 | unsigned char b; |
| 196 | int mod; |
| 197 | |
| 198 | DPRINTF("init\n"); |
| 199 | |
| 200 | rtc_go_output(DATA|SCLK|RST); |
| 201 | |
| 202 | /* disable write protect */ |
| 203 | b = 0; |
| 204 | write_ser_drv(0x8e,&b,1); |
| 205 | |
| 206 | /* enable trickle */ |
| 207 | b = 0xa5; /* 1010.0101 */ |
| 208 | write_ser_drv(0x90,&b,1); |
| 209 | |
| 210 | /* read burst */ |
| 211 | read_ser_drv(0xbe, (unsigned char *)&bbclk, 8); |
| 212 | |
| 213 | /* Sanity checks */ |
| 214 | mod = 0; |
| 215 | if (bbclk.CH) { |
| 216 | printf("ds1302: Clock was halted, starting clock\n"); |
| 217 | bbclk.CH=0; |
| 218 | mod=1; |
| 219 | } |
| 220 | |
| 221 | if (bbclk.fmt) { |
| 222 | printf("ds1302: Clock was in 12 hour mode, fixing\n"); |
| 223 | bbclk.fmt=0; |
| 224 | mod=1; |
| 225 | } |
| 226 | |
| 227 | if (bbclk.year>9) { |
| 228 | printf("ds1302: Year was corrupted, fixing\n"); |
Wolfgang Denk | 41253be | 2005-12-04 11:20:57 +0100 | [diff] [blame] | 229 | bbclk.year10=100/10; /* 2000 - why not? ;) */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 230 | bbclk.year=0; |
| 231 | mod=1; |
| 232 | } |
| 233 | |
| 234 | /* Write out the changes if needed */ |
| 235 | if (mod) { |
| 236 | /* enable write protect */ |
| 237 | bbclk.WP = 1; |
| 238 | write_ser_drv(0xbe,(unsigned char *)&bbclk,8); |
| 239 | } else { |
| 240 | /* Else just turn write protect on */ |
| 241 | b = 0x80; |
| 242 | write_ser_drv(0x8e,&b,1); |
| 243 | } |
| 244 | DPRINTF("init done\n"); |
| 245 | |
| 246 | ds1302_initted=1; |
| 247 | } |
| 248 | |
| 249 | void |
| 250 | rtc_reset(void) |
| 251 | { |
| 252 | if(!ds1302_initted) rtc_init(); |
| 253 | /* TODO */ |
| 254 | } |
| 255 | |
Yuri Tikhonov | b73a19e | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 256 | int |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 257 | rtc_get(struct rtc_time *tmp) |
| 258 | { |
Yuri Tikhonov | b73a19e | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 259 | int rel = 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 260 | struct ds1302_st bbclk; |
| 261 | |
| 262 | if(!ds1302_initted) rtc_init(); |
| 263 | |
| 264 | read_ser_drv(0xbe,(unsigned char *)&bbclk, 8); /* read burst */ |
| 265 | |
| 266 | if (bbclk.CH) { |
| 267 | printf("ds1302: rtc_get: Clock was halted, clock probably " |
| 268 | "corrupt\n"); |
Yuri Tikhonov | b73a19e | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 269 | rel = -1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | tmp->tm_sec=10*bbclk.sec10+bbclk.sec; |
| 273 | tmp->tm_min=10*bbclk.min10+bbclk.min; |
| 274 | tmp->tm_hour=10*bbclk.hr10+bbclk.hr; |
| 275 | tmp->tm_wday=bbclk.day; |
| 276 | tmp->tm_mday=10*bbclk.date10+bbclk.date; |
| 277 | tmp->tm_mon=10*bbclk.month10+bbclk.month; |
| 278 | tmp->tm_year=10*bbclk.year10+bbclk.year + 1900; |
| 279 | |
| 280 | tmp->tm_yday = 0; |
| 281 | tmp->tm_isdst= 0; |
| 282 | |
| 283 | DPRINTF("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 284 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 285 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec ); |
Yuri Tikhonov | b73a19e | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 286 | |
| 287 | return rel; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 288 | } |
| 289 | |
Jean-Christophe PLAGNIOL-VILLARD | d1e2319 | 2008-09-01 23:06:23 +0200 | [diff] [blame] | 290 | int rtc_set(struct rtc_time *tmp) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 291 | { |
| 292 | struct ds1302_st bbclk; |
| 293 | unsigned char b=0; |
| 294 | |
| 295 | if(!ds1302_initted) rtc_init(); |
| 296 | |
| 297 | DPRINTF("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 298 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 299 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
| 300 | |
| 301 | memset(&bbclk,0,sizeof(bbclk)); |
| 302 | bbclk.CH=0; /* dont halt */ |
| 303 | bbclk.WP=1; /* write protect when we're done */ |
| 304 | |
| 305 | bbclk.sec10=tmp->tm_sec/10; |
| 306 | bbclk.sec=tmp->tm_sec%10; |
| 307 | |
| 308 | bbclk.min10=tmp->tm_min/10; |
| 309 | bbclk.min=tmp->tm_min%10; |
| 310 | |
| 311 | bbclk.hr10=tmp->tm_hour/10; |
| 312 | bbclk.hr=tmp->tm_hour%10; |
| 313 | |
| 314 | bbclk.day=tmp->tm_wday; |
| 315 | |
| 316 | bbclk.date10=tmp->tm_mday/10; |
| 317 | bbclk.date=tmp->tm_mday%10; |
| 318 | |
| 319 | bbclk.month10=tmp->tm_mon/10; |
| 320 | bbclk.month=tmp->tm_mon%10; |
| 321 | |
| 322 | tmp->tm_year -= 1900; |
| 323 | bbclk.year10=tmp->tm_year/10; |
| 324 | bbclk.year=tmp->tm_year%10; |
| 325 | |
| 326 | write_ser_drv(0x8e,&b,1); /* disable write protect */ |
| 327 | write_ser_drv(0xbe,(unsigned char *)&bbclk, 8); /* write burst */ |
Jean-Christophe PLAGNIOL-VILLARD | d1e2319 | 2008-09-01 23:06:23 +0200 | [diff] [blame] | 328 | |
| 329 | return 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | #endif |