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