Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 1 | #include <console/console.h> |
| 2 | #include <arch/io.h> |
| 3 | #include <pc80/mc146818rtc.h> |
Stefan Reinauer | ca374d4 | 2008-01-18 16:16:45 +0000 | [diff] [blame] | 4 | #include <boot/coreboot_tables.h> |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 5 | #include <string.h> |
Stefan Reinauer | 8e726b7 | 2010-03-29 23:01:35 +0000 | [diff] [blame] | 6 | #if CONFIG_HAVE_OPTION_TABLE |
| 7 | #include <option_table.h> |
| 8 | #endif |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 9 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 10 | /* control registers - Moto names |
| 11 | */ |
| 12 | #define RTC_REG_A 10 |
| 13 | #define RTC_REG_B 11 |
| 14 | #define RTC_REG_C 12 |
| 15 | #define RTC_REG_D 13 |
| 16 | |
| 17 | |
| 18 | /********************************************************************** |
| 19 | * register details |
| 20 | **********************************************************************/ |
| 21 | #define RTC_FREQ_SELECT RTC_REG_A |
| 22 | |
| 23 | /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, |
| 24 | * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, |
| 25 | * totalling to a max high interval of 2.228 ms. |
| 26 | */ |
| 27 | # define RTC_UIP 0x80 |
| 28 | # define RTC_DIV_CTL 0x70 |
| 29 | /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ |
| 30 | # define RTC_REF_CLCK_4MHZ 0x00 |
| 31 | # define RTC_REF_CLCK_1MHZ 0x10 |
| 32 | # define RTC_REF_CLCK_32KHZ 0x20 |
| 33 | /* 2 values for divider stage reset, others for "testing purposes only" */ |
| 34 | # define RTC_DIV_RESET1 0x60 |
| 35 | # define RTC_DIV_RESET2 0x70 |
| 36 | /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ |
| 37 | # define RTC_RATE_SELECT 0x0F |
| 38 | # define RTC_RATE_NONE 0x00 |
| 39 | # define RTC_RATE_32786HZ 0x01 |
| 40 | # define RTC_RATE_16384HZ 0x02 |
| 41 | # define RTC_RATE_8192HZ 0x03 |
| 42 | # define RTC_RATE_4096HZ 0x04 |
| 43 | # define RTC_RATE_2048HZ 0x05 |
| 44 | # define RTC_RATE_1024HZ 0x06 |
| 45 | # define RTC_RATE_512HZ 0x07 |
| 46 | # define RTC_RATE_256HZ 0x08 |
| 47 | # define RTC_RATE_128HZ 0x09 |
| 48 | # define RTC_RATE_64HZ 0x0a |
| 49 | # define RTC_RATE_32HZ 0x0b |
| 50 | # define RTC_RATE_16HZ 0x0c |
| 51 | # define RTC_RATE_8HZ 0x0d |
| 52 | # define RTC_RATE_4HZ 0x0e |
| 53 | # define RTC_RATE_2HZ 0x0f |
| 54 | |
| 55 | /**********************************************************************/ |
| 56 | #define RTC_CONTROL RTC_REG_B |
| 57 | # define RTC_SET 0x80 /* disable updates for clock setting */ |
| 58 | # define RTC_PIE 0x40 /* periodic interrupt enable */ |
| 59 | # define RTC_AIE 0x20 /* alarm interrupt enable */ |
| 60 | # define RTC_UIE 0x10 /* update-finished interrupt enable */ |
| 61 | # define RTC_SQWE 0x08 /* enable square-wave output */ |
| 62 | # define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ |
| 63 | # define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ |
| 64 | # define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ |
| 65 | |
| 66 | /**********************************************************************/ |
| 67 | #define RTC_INTR_FLAGS RTC_REG_C |
| 68 | /* caution - cleared by read */ |
| 69 | # define RTC_IRQF 0x80 /* any of the following 3 is active */ |
| 70 | # define RTC_PF 0x40 |
| 71 | # define RTC_AF 0x20 |
| 72 | # define RTC_UF 0x10 |
| 73 | |
| 74 | /**********************************************************************/ |
| 75 | #define RTC_VALID RTC_REG_D |
| 76 | # define RTC_VRT 0x80 /* valid RAM and time */ |
| 77 | /**********************************************************************/ |
| 78 | |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 79 | static inline unsigned char cmos_read(unsigned char addr) |
| 80 | { |
| 81 | int offs = 0; |
| 82 | if (addr >= 128) { |
| 83 | offs = 2; |
| 84 | addr -= 128; |
| 85 | } |
| 86 | outb(addr, RTC_BASE_PORT + offs + 0); |
| 87 | return inb(RTC_BASE_PORT + offs + 1); |
| 88 | } |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 89 | |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 90 | static inline void cmos_write(unsigned char val, unsigned char addr) |
| 91 | { |
| 92 | int offs = 0; |
| 93 | if (addr >= 128) { |
| 94 | offs = 2; |
| 95 | addr -= 128; |
| 96 | } |
| 97 | outb(addr, RTC_BASE_PORT + offs + 0); |
| 98 | outb(val, RTC_BASE_PORT + offs + 1); |
| 99 | } |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 100 | |
Stefan Reinauer | 2549d52 | 2010-03-17 03:44:45 +0000 | [diff] [blame] | 101 | #if CONFIG_HAVE_OPTION_TABLE |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 102 | static int rtc_checksum_valid(int range_start, int range_end, int cks_loc) |
| 103 | { |
| 104 | int i; |
| 105 | unsigned sum, old_sum; |
| 106 | sum = 0; |
| 107 | for(i = range_start; i <= range_end; i++) { |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 108 | sum += cmos_read(i); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 109 | } |
| 110 | sum = (~sum)&0x0ffff; |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 111 | old_sum = ((cmos_read(cks_loc)<<8) | cmos_read(cks_loc+1))&0x0ffff; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 112 | return sum == old_sum; |
| 113 | } |
| 114 | |
| 115 | static void rtc_set_checksum(int range_start, int range_end, int cks_loc) |
| 116 | { |
| 117 | int i; |
| 118 | unsigned sum; |
| 119 | sum = 0; |
| 120 | for(i = range_start; i <= range_end; i++) { |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 121 | sum += cmos_read(i); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 122 | } |
| 123 | sum = ~(sum & 0x0ffff); |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 124 | cmos_write(((sum >> 8) & 0x0ff), cks_loc); |
| 125 | cmos_write(((sum >> 0) & 0x0ff), cks_loc+1); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 126 | } |
Stefan Reinauer | 2549d52 | 2010-03-17 03:44:45 +0000 | [diff] [blame] | 127 | #endif |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 128 | |
Stefan Reinauer | 2fbbea0 | 2010-01-16 13:27:39 +0000 | [diff] [blame] | 129 | #if CONFIG_ARCH_X86 |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 130 | #define RTC_CONTROL_DEFAULT (RTC_24H) |
| 131 | #define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ) |
Stefan Reinauer | 2fbbea0 | 2010-01-16 13:27:39 +0000 | [diff] [blame] | 132 | #else |
| 133 | #if CONFIG_ARCH_ALPHA |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 134 | #define RTC_CONTROL_DEFAULT (RTC_SQWE | RTC_24H) |
| 135 | #define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ) |
| 136 | #endif |
Stefan Reinauer | 2fbbea0 | 2010-01-16 13:27:39 +0000 | [diff] [blame] | 137 | #endif |
Li-Ta Lo | 84a8028 | 2005-01-07 02:42:53 +0000 | [diff] [blame] | 138 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 139 | void rtc_init(int invalid) |
| 140 | { |
Maciej Pijanka | ea92185 | 2009-10-27 14:29:29 +0000 | [diff] [blame] | 141 | #if CONFIG_HAVE_OPTION_TABLE |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 142 | unsigned char x; |
| 143 | int cmos_invalid, checksum_invalid; |
Maciej Pijanka | ea92185 | 2009-10-27 14:29:29 +0000 | [diff] [blame] | 144 | #endif |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 145 | |
Stefan Reinauer | c02b4fc | 2010-03-22 11:42:32 +0000 | [diff] [blame] | 146 | printk(BIOS_DEBUG, "RTC Init\n"); |
Steven J. Magnani | 8cbc475 | 2005-09-12 18:43:27 +0000 | [diff] [blame] | 147 | |
Stefan Reinauer | 0867062 | 2009-06-30 15:17:49 +0000 | [diff] [blame] | 148 | #if CONFIG_HAVE_OPTION_TABLE |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 149 | /* See if there has been a CMOS power problem. */ |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 150 | x = cmos_read(RTC_VALID); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 151 | cmos_invalid = !(x & RTC_VRT); |
| 152 | |
| 153 | /* See if there is a CMOS checksum error */ |
| 154 | checksum_invalid = !rtc_checksum_valid(PC_CKS_RANGE_START, |
| 155 | PC_CKS_RANGE_END,PC_CKS_LOC); |
| 156 | |
| 157 | if (invalid || cmos_invalid || checksum_invalid) { |
Stefan Reinauer | c02b4fc | 2010-03-22 11:42:32 +0000 | [diff] [blame] | 158 | printk(BIOS_WARNING, "RTC:%s%s%s zeroing cmos\n", |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame^] | 159 | invalid?" Clear requested":"", |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 160 | cmos_invalid?" Power Problem":"", |
| 161 | checksum_invalid?" Checksum invalid":""); |
| 162 | #if 0 |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 163 | cmos_write(0, 0x01); |
| 164 | cmos_write(0, 0x03); |
| 165 | cmos_write(0, 0x05); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 166 | for(i = 10; i < 48; i++) { |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 167 | cmos_write(0, i); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 168 | } |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame^] | 169 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 170 | if (cmos_invalid) { |
| 171 | /* Now setup a default date of Sat 1 January 2000 */ |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 172 | cmos_write(0, 0x00); /* seconds */ |
| 173 | cmos_write(0, 0x02); /* minutes */ |
| 174 | cmos_write(1, 0x04); /* hours */ |
| 175 | cmos_write(7, 0x06); /* day of week */ |
| 176 | cmos_write(1, 0x07); /* day of month */ |
| 177 | cmos_write(1, 0x08); /* month */ |
| 178 | cmos_write(0, 0x09); /* year */ |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 179 | } |
| 180 | #endif |
| 181 | } |
Steven J. Magnani | 8cbc475 | 2005-09-12 18:43:27 +0000 | [diff] [blame] | 182 | #endif |
| 183 | |
| 184 | /* Setup the real time clock */ |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 185 | cmos_write(RTC_CONTROL_DEFAULT, RTC_CONTROL); |
Steven J. Magnani | 8cbc475 | 2005-09-12 18:43:27 +0000 | [diff] [blame] | 186 | /* Setup the frequency it operates at */ |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 187 | cmos_write(RTC_FREQ_SELECT_DEFAULT, RTC_FREQ_SELECT); |
Steven J. Magnani | 8cbc475 | 2005-09-12 18:43:27 +0000 | [diff] [blame] | 188 | |
Stefan Reinauer | 0867062 | 2009-06-30 15:17:49 +0000 | [diff] [blame] | 189 | #if CONFIG_HAVE_OPTION_TABLE |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 190 | /* See if there is a LB CMOS checksum error */ |
Stefan Reinauer | b5828d7 | 2010-03-29 17:14:28 +0000 | [diff] [blame] | 191 | checksum_invalid = !rtc_checksum_valid(LB_CKS_RANGE_START, |
| 192 | LB_CKS_RANGE_END,LB_CKS_LOC); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 193 | if(checksum_invalid) |
Stefan Reinauer | c02b4fc | 2010-03-22 11:42:32 +0000 | [diff] [blame] | 194 | printk(BIOS_DEBUG, "Invalid CMOS LB checksum\n"); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 195 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 196 | /* Make certain we have a valid checksum */ |
| 197 | rtc_set_checksum(PC_CKS_RANGE_START, |
| 198 | PC_CKS_RANGE_END,PC_CKS_LOC); |
Steven J. Magnani | 8cbc475 | 2005-09-12 18:43:27 +0000 | [diff] [blame] | 199 | #endif |
| 200 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 201 | /* Clear any pending interrupts */ |
Stefan Reinauer | 73d5daa | 2009-04-22 09:03:08 +0000 | [diff] [blame] | 202 | (void) cmos_read(RTC_INTR_FLAGS); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | |
Stefan Reinauer | 0867062 | 2009-06-30 15:17:49 +0000 | [diff] [blame] | 206 | #if CONFIG_USE_OPTION_TABLE == 1 |
Luc Verhaegen | a9c5ea0 | 2009-06-03 14:19:33 +0000 | [diff] [blame] | 207 | /* This routine returns the value of the requested bits |
| 208 | input bit = bit count from the beginning of the cmos image |
| 209 | length = number of bits to include in the value |
| 210 | ret = a character pointer to where the value is to be returned |
| 211 | output the value placed in ret |
| 212 | returns 0 = successful, -1 = an error occurred |
| 213 | */ |
| 214 | static int get_cmos_value(unsigned long bit, unsigned long length, void *vret) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 215 | { |
Luc Verhaegen | a9c5ea0 | 2009-06-03 14:19:33 +0000 | [diff] [blame] | 216 | unsigned char *ret; |
| 217 | unsigned long byte,byte_bit; |
| 218 | unsigned long i; |
| 219 | unsigned char uchar; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 220 | |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame^] | 221 | /* The table is checked when it is built to ensure all |
Luc Verhaegen | a9c5ea0 | 2009-06-03 14:19:33 +0000 | [diff] [blame] | 222 | values are valid. */ |
| 223 | ret = vret; |
| 224 | byte=bit/8; /* find the byte where the data starts */ |
| 225 | byte_bit=bit%8; /* find the bit in the byte where the data starts */ |
| 226 | if(length<9) { /* one byte or less */ |
| 227 | uchar = cmos_read(byte); /* load the byte */ |
| 228 | uchar >>= byte_bit; /* shift the bits to byte align */ |
| 229 | /* clear unspecified bits */ |
| 230 | ret[0] = uchar & ((1 << length) -1); |
Luc Verhaegen | 9ceae90 | 2009-06-03 10:47:19 +0000 | [diff] [blame] | 231 | } |
Luc Verhaegen | a9c5ea0 | 2009-06-03 14:19:33 +0000 | [diff] [blame] | 232 | else { /* more that one byte so transfer the whole bytes */ |
| 233 | for(i=0;length;i++,length-=8,byte++) { |
| 234 | /* load the byte */ |
| 235 | ret[i]=cmos_read(byte); |
| 236 | } |
| 237 | } |
| 238 | return 0; |
Luc Verhaegen | 9ceae90 | 2009-06-03 10:47:19 +0000 | [diff] [blame] | 239 | } |
| 240 | |
Myles Watson | 3fe6b70 | 2009-10-09 20:13:43 +0000 | [diff] [blame] | 241 | int get_option(void *dest, const char *name) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 242 | { |
| 243 | extern struct cmos_option_table option_table; |
| 244 | struct cmos_option_table *ct; |
| 245 | struct cmos_entries *ce; |
| 246 | size_t namelen; |
| 247 | int found=0; |
| 248 | |
| 249 | /* Figure out how long name is */ |
| 250 | namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame^] | 251 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 252 | /* find the requested entry record */ |
| 253 | ct=&option_table; |
| 254 | ce=(struct cmos_entries*)((unsigned char *)ct + ct->header_length); |
| 255 | for(;ce->tag==LB_TAG_OPTION; |
| 256 | ce=(struct cmos_entries*)((unsigned char *)ce + ce->size)) { |
| 257 | if (memcmp(ce->name, name, namelen) == 0) { |
| 258 | found=1; |
| 259 | break; |
| 260 | } |
| 261 | } |
| 262 | if(!found) { |
Stefan Reinauer | 8e726b7 | 2010-03-29 23:01:35 +0000 | [diff] [blame] | 263 | printk(BIOS_DEBUG, "WARNING: No CMOS option '%s'.\n", name); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 264 | return(-2); |
| 265 | } |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame^] | 266 | |
Luc Verhaegen | a9c5ea0 | 2009-06-03 14:19:33 +0000 | [diff] [blame] | 267 | if(get_cmos_value(ce->bit, ce->length, dest)) |
| 268 | return(-3); |
Stefan Reinauer | b5828d7 | 2010-03-29 17:14:28 +0000 | [diff] [blame] | 269 | if(!rtc_checksum_valid(LB_CKS_RANGE_START, |
| 270 | LB_CKS_RANGE_END,LB_CKS_LOC)) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 271 | return(-4); |
| 272 | return(0); |
| 273 | } |
Stefan Reinauer | 0867062 | 2009-06-30 15:17:49 +0000 | [diff] [blame] | 274 | #endif /* CONFIG_USE_OPTION_TABLE */ |