blob: f81f370250720427d8d570e64ed7ae0469571a3a [file] [log] [blame]
David Howellsb920de12008-02-08 04:19:31 -08001/* 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>
Arnd Bergmann5ee98ab2016-06-01 16:46:22 +020015#include <linux/ioport.h>
16#include <linux/platform_device.h>
17
David Howellsb920de12008-02-08 04:19:31 -080018#include <asm/rtc-regs.h>
19#include <asm/rtc.h>
20
21DEFINE_SPINLOCK(rtc_lock);
22EXPORT_SYMBOL(rtc_lock);
23
Arnd Bergmann5ee98ab2016-06-01 16:46:22 +020024static const __initdata struct resource res[] = {
25 DEFINE_RES_IO(RTC_PORT(0), RTC_IO_EXTENT),
26 DEFINE_RES_IRQ(RTC_IRQ),
27};
David Howellsb920de12008-02-08 04:19:31 -080028
29/*
30 * calibrate the TSC clock against the RTC
31 */
32void __init calibrate_clock(void)
33{
David Howellsb920de12008-02-08 04:19:31 -080034 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;
Akira Takeuchi368dd5a2010-10-27 17:28:55 +010040 RTCRB &= ~RTCRB_DM_BINARY;
David Howellsb920de12008-02-08 04:19:31 -080041 RTCRA |= RTCRA_DVR;
42 RTCRA &= ~RTCRA_DVR;
43 RTCRB &= ~RTCRB_SET;
Arnd Bergmann5ee98ab2016-06-01 16:46:22 +020044
45 platform_device_register_simple("rtc_cmos", -1, res, ARRAY_SIZE(res));
David Howellsb920de12008-02-08 04:19:31 -080046}