LXR linux/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/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? */
  27unsigned long sun3_gettimeoffset(void)
  28{
  29  return 1;
  30}
  31
  32
  33/* get/set hwclock */
  34
  35int 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
  76