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   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/errno.h>
  17 #include <asm/system.h>
  18 #include <asm/rtc.h>
  19 #include <asm/intersil.h>
  20
  21
  22 /* bits to set for start/run of the intersil */
  23 #define STOP_VAL (INTERSIL_STOP | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  24 #define START_VAL (INTERSIL_RUN | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  25
  26 /* does this need to be implemented? */
  27 unsigned long sun3_gettimeoffset(void)
  28 {
  29   return 1;
  30 }
  31
  32
  33 /* get/set hwclock */
  34
  35 int sun3_hwclk(int set, struct rtc_time *t)
  36 {
  37         volatile struct intersil_dt *todintersil;
  38         unsigned long flags;
  39
  40         todintersil = (struct intersil_dt *) &intersil_clock->counter;
  41
  42         local_irq_save(flags);
  43
  44         intersil_clock->cmd_reg = STOP_VAL;
  45
  46         /* set or read the clock */
  47         if(set) {
  48                 todintersil->csec = 0;
  49                 todintersil->hour = t->tm_hour;
  50                 todintersil->minute = t->tm_min;
  51                 todintersil->second = t->tm_sec;
  52                 todintersil->month = t->tm_mon;
  53                 todintersil->day = t->tm_mday;
  54                 todintersil->year = t->tm_year - 68;
  55                 todintersil->weekday = t->tm_wday;
  56         } else {
  57                 /* read clock */
  58                 t->tm_sec = todintersil->csec;
  59                 t->tm_hour = todintersil->hour;
  60                 t->tm_min = todintersil->minute;
  61                 t->tm_sec = todintersil->second;
  62                 t->tm_mon = todintersil->month;
  63                 t->tm_mday = todintersil->day;
  64                 t->tm_year = todintersil->year + 68;
  65                 t->tm_wday = todintersil->weekday;
  66         }
  67
  68         intersil_clock->cmd_reg = START_VAL;
  69
  70         local_irq_restore(flags);
  71
  72         return 0;
  73
  74 }
  75