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/errno.h>
  17 #include <asm/intersil.h>
  18 #include <asm/machdep.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 /* get/set hwclock */
  26
  27 int sun3_hwclk(int set, struct rtc_time *t)
  28 {
  29         volatile struct intersil_dt *todintersil;
  30         unsigned long flags;
  31
  32         todintersil = (struct intersil_dt *) &intersil_clock->counter;
  33
  34         local_irq_save(flags);
  35
  36         intersil_clock->cmd_reg = STOP_VAL;
  37
  38         /* set or read the clock */
  39         if(set) {
  40                 todintersil->csec = 0;
  41                 todintersil->hour = t->tm_hour;
  42                 todintersil->minute = t->tm_min;
  43                 todintersil->second = t->tm_sec;
  44                 todintersil->month = t->tm_mon + 1;
  45                 todintersil->day = t->tm_mday;
  46                 todintersil->year = (t->tm_year - 68) % 100;
  47                 todintersil->weekday = t->tm_wday;
  48         } else {
  49                 /* read clock */
  50                 t->tm_sec = todintersil->csec;
  51                 t->tm_hour = todintersil->hour;
  52                 t->tm_min = todintersil->minute;
  53                 t->tm_sec = todintersil->second;
  54                 t->tm_mon = todintersil->month - 1;
  55                 t->tm_mday = todintersil->day;
  56                 t->tm_year = todintersil->year + 68;
  57                 t->tm_wday = todintersil->weekday;
  58                 if (t->tm_year < 70)
  59                         t->tm_year += 100;
  60         }
  61
  62         intersil_clock->cmd_reg = START_VAL;
  63
  64         local_irq_restore(flags);
  65
  66         return 0;
  67
  68 }
  69