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/arch/mn10300/kernel/rtc.c

http://github.com/mirrors/linux
C | 46 lines | 26 code | 6 blank | 14 comment | 0 complexity | 3432936ce06e896670b487f89c33c730 MD5 | raw file
 1/* MN10300 RTC management
 2 *
 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 4 * Written by David Howells (dhowells@redhat.com)
 5 *
 6 * This program is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU General Public Licence
 8 * as published by the Free Software Foundation; either version
 9 * 2 of the Licence, or (at your option) any later version.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/mc146818rtc.h>
15#include <linux/ioport.h>
16#include <linux/platform_device.h>
17
18#include <asm/rtc-regs.h>
19#include <asm/rtc.h>
20
21DEFINE_SPINLOCK(rtc_lock);
22EXPORT_SYMBOL(rtc_lock);
23
24static const __initdata struct resource res[] = {
25	DEFINE_RES_IO(RTC_PORT(0), RTC_IO_EXTENT),
26	DEFINE_RES_IRQ(RTC_IRQ),
27};
28
29/*
30 * calibrate the TSC clock against the RTC
31 */
32void __init calibrate_clock(void)
33{
34	unsigned char status;
35
36	/* make sure the RTC is running and is set to operate in 24hr mode */
37	status = RTSRC;
38	RTCRB |= RTCRB_SET;
39	RTCRB |= RTCRB_TM_24HR;
40	RTCRB &= ~RTCRB_DM_BINARY;
41	RTCRA |= RTCRA_DVR;
42	RTCRA &= ~RTCRA_DVR;
43	RTCRB &= ~RTCRB_SET;
44
45	platform_device_register_simple("rtc_cmos", -1, res, ARRAY_SIZE(res));
46}