https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 3d7cb6b04c3f3115719235cc6866b10326de34cd authored by Linus Torvalds on 31 July 2022, 21:03:01 UTC
Linux 5.19
Linux 5.19
Tip revision: 3d7cb6b
isa-rtc.c
// SPDX-License-Identifier: GPL-2.0
/*
* arch/arm/mach-footbridge/isa-rtc.c
*
* Copyright (C) 1998 Russell King.
* Copyright (C) 1998 Phil Blundell
*
* CATS has a real-time clock, though the evaluation board doesn't.
*
* Changelog:
* 21-Mar-1998 RMK Created
* 27-Aug-1998 PJB CATS support
* 28-Dec-1998 APH Made leds optional
* 20-Jan-1999 RMK Started merge of EBSA285, CATS and NetWinder
* 16-Mar-1999 RMK More support for EBSA285-like machines with RTCs in
*/
#define RTC_PORT(x) (0x70+(x))
#define RTC_ALWAYS_BCD 0
#include <linux/init.h>
#include <linux/mc146818rtc.h>
#include <linux/bcd.h>
#include <linux/io.h>
#include "common.h"
void __init isa_rtc_init(void)
{
int reg_d, reg_b;
/*
* Probe for the RTC.
*/
reg_d = CMOS_READ(RTC_REG_D);
/*
* make sure the divider is set
*/
CMOS_WRITE(RTC_REF_CLCK_32KHZ, RTC_REG_A);
/*
* Set control reg B
* (24 hour mode, update enabled)
*/
reg_b = CMOS_READ(RTC_REG_B) & 0x7f;
reg_b |= 2;
CMOS_WRITE(reg_b, RTC_REG_B);
if ((CMOS_READ(RTC_REG_A) & 0x7f) == RTC_REF_CLCK_32KHZ &&
CMOS_READ(RTC_REG_B) == reg_b) {
/*
* We have a RTC. Check the battery
*/
if ((reg_d & 0x80) == 0)
printk(KERN_WARNING "RTC: *** warning: CMOS battery bad\n");
}
}