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/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? */
  26u32 sun3_gettimeoffset(void)
  27{
  28  return 1000;
  29}
  30
  31
  32/* get/set hwclock */
  33
  34int sun3_hwclk(int set, struct rtc_time *t)
  35{
  36        volatile struct intersil_dt *todintersil;
  37        unsigned long flags;
  38
  39        todintersil = (struct intersil_dt *) &intersil_clock->counter;
  40
  41        local_irq_save(flags);
  42
  43        intersil_clock->cmd_reg = STOP_VAL;
  44
  45        /* set or read the clock */
  46        if(set) {
  47                todintersil->csec = 0;
  48                todintersil->hour = t->tm_hour;
  49                todintersil->minute = t->tm_min;
  50                todintersil->second = t->tm_sec;
  51                todintersil->month = t->tm_mon;
  52                todintersil->day = t->tm_mday;
  53                todintersil->year = t->tm_year - 68;
  54                todintersil->weekday = t->tm_wday;
  55        } else {
  56                /* read clock */
  57                t->tm_sec = todintersil->csec;
  58                t->tm_hour = todintersil->hour;
  59                t->tm_min = todintersil->minute;
  60                t->tm_sec = todintersil->second;
  61                t->tm_mon = todintersil->month;
  62                t->tm_mday = todintersil->day;
  63                t->tm_year = todintersil->year + 68;
  64                t->tm_wday = todintersil->weekday;
  65        }
  66
  67        intersil_clock->cmd_reg = START_VAL;
  68
  69        local_irq_restore(flags);
  70
  71        return 0;
  72
  73}
  74
  75