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 27 int 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