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
28 int 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
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