82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
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#include <linux/bcd.h>
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#include <linux/time.h>
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#include <asm/ds1216.h>
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volatile unsigned char *ds1216_base;
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/*
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* Read the 64 bit we'd like to have - It a series
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* of 64 bits showing up in the LSB of the base register.
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*
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*/
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static unsigned char *ds1216_read(void)
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{
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static unsigned char rdbuf[8];
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unsigned char c;
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int i, j;
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for (i = 0; i < 8; i++) {
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c = 0x0;
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for (j = 0; j < 8; j++) {
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c |= (*ds1216_base & 0x1) << j;
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}
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rdbuf[i] = c;
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}
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return rdbuf;
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}
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static void ds1216_switch_ds_to_clock(void)
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{
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unsigned char magic[] = {
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0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
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};
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int i,j,c;
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/* Reset magic pointer */
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c = *ds1216_base;
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/* Write 64 bit magic to DS1216 */
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for (i = 0; i < 8; i++) {
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c = magic[i];
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for (j = 0; j < 8; j++) {
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*ds1216_base = c;
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c = c >> 1;
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}
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}
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}
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unsigned long ds1216_get_cmos_time(void)
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{
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unsigned char *rdbuf;
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unsigned int year, month, date, hour, min, sec;
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ds1216_switch_ds_to_clock();
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rdbuf = ds1216_read();
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sec = BCD2BIN(DS1216_SEC(rdbuf));
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min = BCD2BIN(DS1216_MIN(rdbuf));
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hour = BCD2BIN(DS1216_HOUR(rdbuf));
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date = BCD2BIN(DS1216_DATE(rdbuf));
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month = BCD2BIN(DS1216_MONTH(rdbuf));
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year = BCD2BIN(DS1216_YEAR(rdbuf));
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if (DS1216_1224(rdbuf) && DS1216_AMPM(rdbuf))
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hour+=12;
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if (year < 70)
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year += 2000;
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else
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year += 1900;
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return mktime(year, month, date, hour, min, sec);
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}
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int ds1216_set_rtc_mmss(unsigned long nowtime)
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{
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printk("ds1216_set_rtc_mmss called but not implemented\n");
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return -1;
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}
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