1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Machine dependent access functions for RTC registers.
4 */
5 #ifndef __ASM_ALPHA_MC146818RTC_H
6 #define __ASM_ALPHA_MC146818RTC_H
7
8 #include <asm/io.h>
9
10 #ifndef RTC_PORT
11 #define RTC_PORT(x) (0x70 + (x))
12 #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */
13 #endif
14
15 /*
16 * The yet supported machines all access the RTC index register via
17 * an ISA port access but the way to access the date register differs ...
18 */
19 #define CMOS_READ(addr) ({ \
20 outb_p((addr),RTC_PORT(0)); \
21 inb_p(RTC_PORT(1)); \
22 })
23 #define CMOS_WRITE(val, addr) ({ \
24 outb_p((addr),RTC_PORT(0)); \
25 outb_p((val),RTC_PORT(1)); \
26 })
27
28 #endif /* __ASM_ALPHA_MC146818RTC_H */