linux/arch/m68k/sun3/intersil.c
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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/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
  27int 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
  70