arch/m68k/sun3/intersil.c

   1 /*
   2  * arch/m68k/sun3/intersil.c
   3  *
   4  * basic routines for accessing the intersil clock within the sun3 machines
   5  *
   6  * started 11/12/1999 Sam Creasey
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/rtc.h>
  15
  16 #include <asm/system.h>
  17 #include <asm/rtc.h>
  18 #include <asm/intersil.h>
  19
  20
  21 /* bits to set for start/run of the intersil */
  22 #define STOP_VAL (INTERSIL_STOP | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  23 #define START_VAL (INTERSIL_RUN | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  24
  25 /* does this need to be implemented? */
  26 unsigned long sun3_gettimeoffset(void)
  27 {
  28   return 1;
  29 }
  30
  31 void sun3_gettod (int *yearp, int *monp, int *dayp,
  32                    int *hourp, int *minp, int *secp)
  33 {
  34         unsigned char wday;
  35         volatile struct intersil_dt* todintersil;
  36         unsigned long flags;
  37
  38         todintersil = (struct intersil_dt *) &intersil_clock->counter;
  39
  40         save_and_cli(flags);
  41
  42         intersil_clock->cmd_reg = STOP_VAL;
  43
  44         *secp  = todintersil->csec;
  45         *hourp = todintersil->hour;
  46         *minp  = todintersil->minute;
  47         *secp  = todintersil->second;
  48         *monp  = todintersil->month;
  49         *dayp  = todintersil->day;
  50         *yearp = todintersil->year+68; /* The base year for sun3 is 1968 */
  51         wday = todintersil->weekday;
  52
  53         intersil_clock->cmd_reg = START_VAL;
  54
  55         restore_flags(flags);
  56 }
  57
  58
  59 /* get/set hwclock */
  60
  61 int sun3_hwclk(int set, struct rtc_time *t)
  62 {
  63         volatile struct intersil_dt *todintersil;
  64         unsigned long flags;
  65
  66         todintersil = (struct intersil_dt *) &intersil_clock->counter;
  67
  68         save_and_cli(flags);
  69
  70         intersil_clock->cmd_reg = STOP_VAL;
  71
  72         /* set or read the clock */
  73         if(set) {
  74                 todintersil->csec = 0;
  75                 todintersil->hour = t->tm_hour;
  76                 todintersil->minute = t->tm_min;
  77                 todintersil->second = t->tm_sec;
  78                 todintersil->month = t->tm_mon;
  79                 todintersil->day = t->tm_mday;
  80                 todintersil->year = t->tm_year - 68;
  81                 todintersil->weekday = t->tm_wday;
  82         } else {
  83                 /* read clock */
  84                 t->tm_sec = todintersil->csec;
  85                 t->tm_hour = todintersil->hour;
  86                 t->tm_min = todintersil->minute;
  87                 t->tm_sec = todintersil->second;
  88                 t->tm_mon = todintersil->month;
  89                 t->tm_mday = todintersil->day;
  90                 t->tm_year = todintersil->year + 68;
  91                 t->tm_wday = todintersil->weekday;
  92         }
  93
  94         intersil_clock->cmd_reg = START_VAL;
  95
  96         restore_flags(flags);
  97
  98         return 0;
  99
 100 }
 101