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