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/intersil.h>
  18#include <asm/machdep.h>
  19
  20#include "sun3.h"
  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/* get/set hwclock */
  27
  28int sun3_hwclk(int set, struct rtc_time *t)
  29{
  30        volatile struct intersil_dt *todintersil;
  31        unsigned long flags;
  32
  33        todintersil = (struct intersil_dt *) &intersil_clock->counter;
  34
  35        local_irq_save(flags);
  36
  37        intersil_clock->cmd_reg = STOP_VAL;
  38
  39        /* set or read the clock */
  40        if(set) {
  41                todintersil->csec = 0;
  42                todintersil->hour = t->tm_hour;
  43                todintersil->minute = t->tm_min;
  44                todintersil->second = t->tm_sec;
  45                todintersil->month = t->tm_mon + 1;
  46                todintersil->day = t->tm_mday;
  47                todintersil->year = (t->tm_year - 68) % 100;
  48                todintersil->weekday = t->tm_wday;
  49        } else {
  50                /* read clock */
  51                t->tm_sec = todintersil->csec;
  52                t->tm_hour = todintersil->hour;
  53                t->tm_min = todintersil->minute;
  54                t->tm_sec = todintersil->second;
  55                t->tm_mon = todintersil->month - 1;
  56                t->tm_mday = todintersil->day;
  57                t->tm_year = todintersil->year + 68;
  58                t->tm_wday = todintersil->weekday;
  59                if (t->tm_year < 70)
  60                        t->tm_year += 100;
  61        }
  62
  63        intersil_clock->cmd_reg = START_VAL;
  64
  65        local_irq_restore(flags);
  66
  67        return 0;
  68
  69}
  70
  71