47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* MN10300 RTC management
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <asm/rtc-regs.h>
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#include <asm/rtc.h>
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DEFINE_SPINLOCK(rtc_lock);
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EXPORT_SYMBOL(rtc_lock);
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static const __initdata struct resource res[] = {
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DEFINE_RES_IO(RTC_PORT(0), RTC_IO_EXTENT),
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DEFINE_RES_IRQ(RTC_IRQ),
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};
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/*
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* calibrate the TSC clock against the RTC
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*/
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void __init calibrate_clock(void)
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{
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unsigned char status;
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/* make sure the RTC is running and is set to operate in 24hr mode */
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status = RTSRC;
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RTCRB |= RTCRB_SET;
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RTCRB |= RTCRB_TM_24HR;
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RTCRB &= ~RTCRB_DM_BINARY;
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RTCRA |= RTCRA_DVR;
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RTCRA &= ~RTCRA_DVR;
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RTCRB &= ~RTCRB_SET;
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platform_device_register_simple("rtc_cmos", -1, res, ARRAY_SIZE(res));
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}
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