arch/mips/sni/ds1216.c

   1
   2 #include <linux/bcd.h>
   3 #include <linux/time.h>
   4
   5 #include <asm/ds1216.h>
   6
   7 volatile unsigned char *ds1216_base;
   8
   9 /*
  10  * Read the 64 bit we'd like to have - It a series
  11  * of 64 bits showing up in the LSB of the base register.
  12  *
  13  */
  14 static unsigned char *ds1216_read(void)
  15 {
  16         static unsigned char    rdbuf[8];
  17         unsigned char           c;
  18         int                     i, j;
  19
  20         for (i = 0; i < 8; i++) {
  21                 c = 0x0;
  22                 for (j = 0; j < 8; j++) {
  23                         c |= (*ds1216_base & 0x1) << j;
  24                 }
  25                 rdbuf[i] = c;
  26         }
  27
  28         return rdbuf;
  29 }
  30
  31 static void ds1216_switch_ds_to_clock(void)
  32 {
  33         unsigned char magic[] = {
  34                 0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
  35         };
  36         int i,j,c;
  37
  38         /* Reset magic pointer */
  39         c = *ds1216_base;
  40
  41         /* Write 64 bit magic to DS1216 */
  42         for (i = 0; i < 8; i++) {
  43                 c = magic[i];
  44                 for (j = 0; j < 8; j++) {
  45                         *ds1216_base = c;
  46                         c = c >> 1;
  47                 }
  48         }
  49 }
  50
  51 unsigned long ds1216_get_cmos_time(void)
  52 {
  53         unsigned char   *rdbuf;
  54         unsigned int    year, month, date, hour, min, sec;
  55
  56         ds1216_switch_ds_to_clock();
  57         rdbuf = ds1216_read();
  58
  59         sec = BCD2BIN(DS1216_SEC(rdbuf));
  60         min = BCD2BIN(DS1216_MIN(rdbuf));
  61         hour = BCD2BIN(DS1216_HOUR(rdbuf));
  62         date = BCD2BIN(DS1216_DATE(rdbuf));
  63         month = BCD2BIN(DS1216_MONTH(rdbuf));
  64         year = BCD2BIN(DS1216_YEAR(rdbuf));
  65
  66         if (DS1216_1224(rdbuf) && DS1216_AMPM(rdbuf))
  67                 hour+=12;
  68
  69         if (year < 70)
  70                 year += 2000;
  71         else
  72                 year += 1900;
  73
  74         return mktime(year, month, date, hour, min, sec);
  75 }
  76
  77 int ds1216_set_rtc_mmss(unsigned long nowtime)
  78 {
  79         printk("ds1216_set_rtc_mmss called but not implemented\n");
  80         return -1;
  81 }