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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/semaphore.h>
  19 #include <asm/rtc.h>
  20 #include <asm/intersil.h>
  21
  22
  23 /* bits to set for start/run of the intersil */
  24 #define STOP_VAL (INTERSIL_STOP | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  25 #define START_VAL (INTERSIL_RUN | INTERSIL_INT_ENABLE | INTERSIL_24H_MODE)
  26
  27 /* does this need to be implemented? */
  28 unsigned long sun3_gettimeoffset(void)
  29 {
  30   return 1;
  31 }
  32
  33
  34 /* get/set hwclock */
  35
  36 int sun3_hwclk(int set, struct rtc_time *t)
  37 {
  38         volatile struct intersil_dt *todintersil;
  39         unsigned long flags;
  40
  41         todintersil = (struct intersil_dt *) &intersil_clock->counter;
  42
  43         local_irq_save(flags);
  44
  45         intersil_clock->cmd_reg = STOP_VAL;
  46
  47         /* set or read the clock */
  48         if(set) {
  49                 todintersil->csec = 0;
  50                 todintersil->hour = t->tm_hour;
  51                 todintersil->minute = t->tm_min;
  52                 todintersil->second = t->tm_sec;
  53                 todintersil->month = t->tm_mon;
  54                 todintersil->day = t->tm_mday;
  55                 todintersil->year = t->tm_year - 68;
  56                 todintersil->weekday = t->tm_wday;
  57         } else {
  58                 /* read clock */
  59                 t->tm_sec = todintersil->csec;
  60                 t->tm_hour = todintersil->hour;
  61                 t->tm_min = todintersil->minute;
  62                 t->tm_sec = todintersil->second;
  63                 t->tm_mon = todintersil->month;
  64                 t->tm_mday = todintersil->day;
  65                 t->tm_year = todintersil->year + 68;
  66                 t->tm_wday = todintersil->weekday;
  67         }
  68
  69         intersil_clock->cmd_reg = START_VAL;
  70
  71         local_irq_restore(flags);
  72
  73         return 0;
  74
  75 }
  76