1/*
 2 * Machine dependent access functions for RTC registers.
 3 */
 4#ifndef _ASM_MC146818RTC_H
 5#define _ASM_MC146818RTC_H
 6
 7#include <linux/io.h>
 8#include <linux/kernel.h>
 9
10#define RTC_IRQ BUILD_BUG_ON(1)
11
12#ifndef RTC_PORT
13#define RTC_PORT(x)	(0x70 + (x))
14#define RTC_ALWAYS_BCD	1	/* RTC operates in binary mode */
15#endif
16
17/*
18 * The yet supported machines all access the RTC index register via
19 * an ISA port access but the way to access the date register differs ...
20 */
21#define CMOS_READ(addr) ({ \
22outb_p((addr),RTC_PORT(0)); \
23inb_p(RTC_PORT(1)); \
24})
25#define CMOS_WRITE(val, addr) ({ \
26outb_p((addr),RTC_PORT(0)); \
27outb_p((val),RTC_PORT(1)); \
28})
29
30#endif /* _ASM_MC146818RTC_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Machine dependent access functions for RTC registers.
 4 */
 5#ifndef _ASM_MC146818RTC_H
 6#define _ASM_MC146818RTC_H
 7
 8#include <linux/io.h>
 9#include <linux/kernel.h>
10
11#define RTC_IRQ BUILD_BUG_ON(1)
12
13#ifndef RTC_PORT
14#define RTC_PORT(x)	(0x70 + (x))
15#define RTC_ALWAYS_BCD	1	/* RTC operates in binary mode */
16#endif
17
18/*
19 * The yet supported machines all access the RTC index register via
20 * an ISA port access but the way to access the date register differs ...
21 */
22#define CMOS_READ(addr) ({ \
23outb_p((addr),RTC_PORT(0)); \
24inb_p(RTC_PORT(1)); \
25})
26#define CMOS_WRITE(val, addr) ({ \
27outb_p((addr),RTC_PORT(0)); \
28outb_p((val),RTC_PORT(1)); \
29})
30
31#endif /* _ASM_MC146818RTC_H */