Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * Machine dependent access functions for RTC registers. | |
4 | */ | |
5 | #ifndef _ASM_MC146818RTC_H | |
6 | #define _ASM_MC146818RTC_H | |
7 | ||
fced80c7 | 8 | #include <linux/io.h> |
bd8abc9a RH |
9 | #include <linux/kernel.h> |
10 | ||
11 | #define RTC_IRQ BUILD_BUG_ON(1) | |
1da177e4 LT |
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) ({ \ | |
23 | outb_p((addr),RTC_PORT(0)); \ | |
24 | inb_p(RTC_PORT(1)); \ | |
25 | }) | |
26 | #define CMOS_WRITE(val, addr) ({ \ | |
27 | outb_p((addr),RTC_PORT(0)); \ | |
28 | outb_p((val),RTC_PORT(1)); \ | |
29 | }) | |
30 | ||
31 | #endif /* _ASM_MC146818RTC_H */ |